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2017年第1期共收录53

1. Load and opening detection system for hoist driven by motor

Accession number: 20171203478144

Authors: Qiao, Aimin (1); He, Boxia (2); Luo, Shaoxuan (1); Huang, Yinghui (1); Wang, Yanchun (1)

Author affiliation: (1) School of Electronic and Electrical Engineering, Bengbu University, Bengbu; 233000, China; (2) School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing; 210094, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 386-396

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Installed between the motor’s shaft and the hoist power input one, an integrate sensor could output not only the total torque signal related to the change for hoist’s load but also 60 pulses per revolution for motor’s shaft. The hoist’s opening could be calculated by associating the number of those pulses with some parameters of the hoist. In the integrate sensor, those rotary circuits could be powered from the rotary secondary of transformer whose primary was fixed with the sensor’s metal shell, which was used as a part of magnetic core of the transformer. By using the photoelectric coupling method, non-contact transmission for the sensor’s signals about the total torque and the opening was realized. Besides the torque caused by constant load, the total one also included some other torques shown as fluctuation and unsteadiness because of those factors, such as friction existing in the hoist’s mechanical structure. In order to get the actual load from the total torque signal, two phases were selected for hoist’s load detection. Firstly, the analog-to-digital converter (ADC) output value corresponding to the total torque was corrected though gray correlation analysis, and the corrected ADC value whose fluctuation and unsteadiness had been greatly reduced was selected to be as the result of the first phase. In the second phase, by using the result of the first phase as input variable, the hoist’s load predicted model was founded according to the least square support vector regression (LS-SVR) or partial least square regression (PLSR). Taking the first predicted value as the expected data sequence and implementing the correction based on the gray correlation analysis again, the hoist actual load was finally attained. Experiment result showed that the error of the result of load detection was less than ±0.6% for LS-SVR and below±1% for PLSR model cooperated with the correction based on the gray correlation analysis. Meanwhile, since the integrate sensor was directly installed between the motor shaft and the hoist one, the number of pulses would be greatly increased during the hoist’s moving up and down which could well improve the opening detection resolution. The resolution of the hoist opening detection was far below 1 mm. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: Hoists

Controlled terms: Analog to digital conversion? - ?Correlation methods? - ?Digital storage? - ?Electric drives? - ?Torque

Uncontrolled terms: Analog to digital converters? - ?Detection system? - ?Gray correlation analysis? - ?Least square support vector regressions? - ?Mechanical structures? - ?Motor drive? - ?Partial least square regression? - ?Photoelectric coupling

Classification code: 691.1 Materials Handling Equipment

Materials Handling Equipment

? - ?722.1 Data Storage, Equipment and Techniques

Data Storage, Equipment and Techniques

? - ?922.2 Mathematical Statistics

Mathematical Statistics

? - ?931.2 Physical Properties of Gases, Liquids and Solids

Physical Properties of Gases, Liquids and Solids

Numerical data indexing: Size 1.00e-03m

DOI: 10.6041/j.issn.1000-1298.2017.01.051

Compendex references: YES

Database: Compendex

 

 

      

2. Diagnosis model of soybean leaf diseases based on improved cascade neural network

Accession number: 20171203478167

Authors: Ma, Xiaodan (1); Guan, Haiou (1); Qi, Guangyun (1); Liu, Gang (2); Tan, Feng (1)

Author affiliation: (1) College of Information Technology, Heilongjiang Bayi Agricultural University, Daqing; 163319, China; (2) Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing; 100083, China

Corresponding author: Qi, Guangyun(bynd_qgy@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 163-168

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Crop disease is an important factor to restrict high-yielding, high-quality and high efficiency of products. Soybean is a critical crop, but incidence of soybean diseases increases year by year during their growth, so diagnosis of soybean diseases timely and accurately can provide reliable basis for prevention and control of soybean. Therefore, aiming at the fuzzy and uncertainty between disease traits and diseases of soybean leaf diseases, combining digital image possessing and neural network technology, the diagnosis model of soybean diseases was proposed based on improved cascade neural network after the potential rules of disease traits and diseases was fully mined. Firstly, the diseases images were acquitted by home-made slide template, the 14 dimensional characteristic parameters were calculated based on the geometry characteristic, color characteristic and texture characteristic of disease areas. Secondly, in order to highlight all aspects of characteristics for different kinds of diseases, the first level of each parallel neural network was constructed, the output of the first level was the input of the second level. Thirdly, the two slopes cascade neural network model was established for diagnosis soybean leaf diseases automatically, which based on inference rules of diseases using respective advantages of multidimensional characteristics, the simulation accuracy was 97.67%. Meanwhile, the cascade neural network parameters were optimized by quantum genetic algorithm. The average number of iterations was 743, and the average network error was 0.000 995 445. The proposed method realized the automatic diagnosis and precise forwards, which also provided important theory basis for disease monitoring and smart pesticide spraying. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 13

Main heading: Diagnosis

Controlled terms: Crops? - ?Disease control? - ?Fuzzy inference? - ?Genetic algorithms? - ?Neural networks

Uncontrolled terms: Cascade neural networks? - ?Characteristic extraction? - ?Diagnosis model? - ?Geometry characteristics? - ?Parallel neural networks? - ?Prevention and controls? - ?Quantum genetic algorithm? - ?Texture characteristics

Classification code: 461.6 Medicine and Pharmacology

Medicine and Pharmacology

? - ?721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory

Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory

? - ?821.4 Agricultural Products

Agricultural Products

Numerical data indexing: Percentage 9.77e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.021

Compendex references: YES

Database: Compendex

 

 

      

3. Feedback characteristics of paddle wing torque motor

Accession number: 20171203478194

Authors: Meng, Bin (1); Shentu, Shengnan (1); Lin, Qiong (1); Ruan, Jian (1)

Author affiliation: (1) Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education, Zhejiang University of Technology, Hangzhou; 310014, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 361-367

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Hydraulic valves were designed with two dimensional (2D) concept uniquely integrated pilot stage and power stage into single spool by taking advantage of both translational and rotary degrees of freedom. It was featured with simple structure, excellent anti-pollution capability, high ratio of power to weight and fast dynamic response, which attracted considerable attention in several areas of modern industry. In order to solve the problem that hydraulic servo screw of direct position feedback 2D servo valve had deficiency of complicated structure and high manufacturing cost, a novel paddle wing torque motor with feedback function was proposed. The motor could be used as electro-mechanical converter and directly connected with spool to constitute a novel force feedback 2D servo valve with simple structure and low manufacturing cost, which was suitable for civil servo valve application. Three types of prototype motors with different inclined angles of paddle wing were manufactured and the test rig was built. The relationships between feedback torque and armature displacement were studied by using methods of magnetic circuit analysis, FEM simulation and experiments. The experimental results were agreed with the simulated results. It was indicated the characteristics between feedback torque and armature displacement were close to linear relationship and its amplitude was raised with the increase of displacement, whose magnitudes reached about 0.098 N·m, 0.132 N·m and 0.16 N·m with paddle wing’s inclined angles of 9°, 12°and 15°, respectively. It was proved that increasing inclined angle was an effective approach to increase feedback torque. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 13

Main heading: Feedback

Controlled terms: Degrees of freedom (mechanics)? - ?Electromechanical devices? - ?Magnetic circuits? - ?Manufacture? - ?Pneumatic servomechanisms? - ?Pollution control? - ?Servomotors? - ?Torque? - ?Torque motors? - ?Valves (mechanical)

Uncontrolled terms: Complicated structures? - ?Effective approaches? - ?Electro-mechanical converters? - ?Fast dynamic response? - ?Feedback functions? - ?Force feedback? - ?Linear relationships? - ?Two Dimensional (2 D)

Classification code: 537.1 Heat Treatment Processes

Heat Treatment Processes

? - ?601.2 Machine Components

Machine Components

? - ?632.4 Pneumatic Equipment and Machinery

Pneumatic Equipment and Machinery

? - ?701.2 Magnetism: Basic Concepts and Phenomena

Magnetism: Basic Concepts and Phenomena

? - ?705.3 Electric Motors

Electric Motors

? - ?731.1 Control Systems

Control Systems

? - ?931.1 Mechanics

Mechanics

? - ?931.2 Physical Properties of Gases, Liquids and Solids

Physical Properties of Gases, Liquids and Solids

Numerical data indexing: Torque 1.32e-01N*m, Torque 1.60e-01N*m, Torque 9.80e-02N*m

DOI: 10.6041/j.issn.1000-1298.2017.01.048

Compendex references: YES

Database: Compendex

 

 

      

4. Analysis of land use spatial autocorrelation patterns and influence factors of xiaolihe watershed

Accession number: 20171203478163

Authors: Fu, Jinxia (1); Zheng, Fenli (1, 2); Li, Yuanyuan (1)

Author affiliation: (1) College of Natural Resources and Environment, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling; Shaanxi; 712100, China

Corresponding author: Zheng, Fenli(flzh@ms.iswc.ac.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 128-138

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aiming to reveal the coupling relationship between land use spatial autocorrelation patterns and natural-social-economic factors of Xiaolihe watershed located in loess hilly-gully region, the global and local spatial autocorrelation patterns of land use types were analyzed by the methods of Moran’s I, Moran scatter plot and Anselin local Moran’s I in the 500 m×500 m grid scale, meanwhile, the relationships between local cluster zones and the selected environmental factors were analyzed at the p<0.05 significant level based on GIS technology. The selected environmental factors included elevation, slope, aspect, water, roads and residential areas. The results showed that all land use types showed positive global spatial autocorrelation, but it was gradually decreased with the increase of distance. Within the distance of 32 km, spatial attenuation intensity of autocorrelation of each land use type was different from the extension of distance. The spatial distribution of cultivated land and grassland showed significant HH (high value-high value) and LL (low value-low value) cluster trends, and that of garden land, forest land, construction land and unused land showed significant HH cluster trend. The HH cluster zones of grassland were mainly distributed in hills or mountains of the midstream and upstream watershed, the HH cluster zones of forest land were mainly distributed in gullies of the downstream watershed and mountains of the upstream watershed, and those of others were mainly distributed in wide loess ridges and wide river valleys of the downstream watershed. With the increase of elevation and slope, the areas of HH and LL cluster zones of each land use type were increased firstly and then decreased. The region, which was located in the elevation area of 1 000~1 300 m, the slope area of 15°~25°, the sunny area and shady slope area, was the most diverse and concentrated area of HH cluster distribution of land use types. The HH cluster zones of construction land and forest land were mainly distributed in the elevation area of 1 000~1 100 m, the HH cluster zones of cultivated land, garden land and unused land were mainly distributed in the elevation area of 1 100~1 200 m, and those of grassland were mainly distributed in the elevation area of 1 200~1 300 m. According to the average slope of HH cluster zones of each land use type in ascending order, the order was as follows: construction land, cultivated land, garden land, forest land, unused land and grassland. The HH cluster zones of construction land, garden land and cultivated land were mainly distributed in sunny area and semi-sunny area, in which the distribution area in sunny area was larger. The HH cluster zones of forest land and garden land were mainly distributed in shady slope area and sunny area, in which the distribution area in shady slope area was larger. With the increase of distance from water and roads, the areas of HH cluster zones of each land use type showed a declining trend except for unused land. With the increase of distance from residential areas, the areas of HH cluster zones of grassland were increased firstly and then decreased, and those of others showed a declining trend. The HH and LL cluster zones of each land use type were mainly distributed within the distance of 1.5 km from water and roads as well as within the distance of 3 km from residential areas. The areas of HH cluster zones of construction land, garden land and cultivated land were increased rapidly with the decrease of distance to water, roads and residential areas. Compared with HH cluster zones, the LL cluster zones of cultivated land were mainly distributed in the elevation area of greater than 1 200 m, and the average slope of the LL cluster zones was increased. The distribution area of the LL cluster zones of cultivated land in the sunny area was slightly larger than those in other aspects. The LL cluster zones of cultivated land were farther away from water and residential areas, and the areas of which were firstly increased and then decreased. While the LL cluster zones of grassland were mainly distributed in the elevation area of 1 000~1 200 m and the slope area of 15°~35°, and the distribution area of the LL cluster zones in each aspect was similar. The LL cluster zones of grassland were closer to water, roads and residential area, and the areas of which showed a declining trend. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Land use

Controlled terms: Autocorrelation? - ?Environmental technology? - ?Forestry? - ?Geographic information systems? - ?Housing? - ?Landforms? - ?Rivers? - ?Sediments? - ?Spatial variables measurement? - ?Transportation ? - ?Watersheds

Uncontrolled terms: Cluster distributions? - ?Coupling relationships? - ?Environmental factors? - ?Influence factors? - ?Loess hilly gully region? - ?Social economic factors? - ?Spatial attenuations? - ?Spatial autocorrelations

Classification code: 403 Urban and Regional Planning and Development

Urban and Regional Planning and Development

? - ?403.1 Urban Planning and Development

Urban Planning and Development

? - ?444.1 Surface Water

Surface Water

? - ?454 Environmental Engineering

Environmental Engineering

? - ?481.1 Geology

Geology

? - ?483 Soil Mechanics and Foundations

Soil Mechanics and Foundations

? - ?903.3 Information Retrieval and Use

Information Retrieval and Use

? - ?921 Mathematics

Mathematics

? - ?943.2 Mechanical Variables Measurements

Mechanical Variables Measurements

Numerical data indexing: Size 1.00e+03m to 1.10e+03m, Size 1.00e+03m to 1.20e+03m, Size 1.00e+03m to 1.30e+03m, Size 1.10e+03m to 1.20e+03m, Size 1.20e+03m, Size 1.20e+03m to 1.30e+03m, Size 1.50e+03m, Size 3.00e+03m, Size 3.20e+04m

DOI: 10.6041/j.issn.1000-1298.2017.01.017

Compendex references: YES

Database: Compendex

 

 

      

5. Greenhouse agricultural machinery indoor positioning method

Accession number: 20171203478150

Authors: Wang, Xin (1); Xu, Miao (1); Zhang, Jingkai (2); Liu, Wang (2); Li, Weiwei (1); Wang, Shumao (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Agriculture Machinery Testing Appraisal and Extension Station of Beijing, Beijing; 100078, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 21-28 and 13

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The agricultural machinery positioning, dynamic tracking and working area calculation in greenhouse were focused on, and an optimum indoor positioning algorithm was proposed based on multi-source data fusion theory. The above method firstly relied on inertia navigation measurement technology to estimate initial value of target positioning; then wireless RSSI ranging technology and weighted centroid algorithm were adopted to obtain positioning measurements; and optimum calculation was conducted with Kalman filtering algorithm to eliminate errors in the end, which were common in present measurement using single measurement technology and caused by data drift, signal obstruction, electromagnetic interference and other factors, in order to acquire accurate positioning information, realize real-time dynamic tracking and calculate working area. In Matlab simulation analysis, the positioning algorithm evaluation indexes were established to assess positioning effect and it was found that the proposed algorithm had better positioning accuracy and stability than single wireless RSSI indoor positioning algorithm. In the field test, the results showed that indoor positioning accuracy was not more than 0.125 m and error was less than 0.4%, which could effectively meet demands of agricultural machinery positioning and real-time dynamic tracking in greenhouse. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Indoor positioning systems

Controlled terms: Agricultural machinery? - ?Agriculture? - ?Data fusion? - ?Electromagnetic pulse? - ?Greenhouses? - ?Information filtering? - ?Kalman filters? - ?MATLAB? - ?Signal interference? - ?Target tracking ? - ?Underwater acoustics

Uncontrolled terms: Kalman filtering algorithms? - ?Kalman-filtering? - ?MATLAB simulation analysis? - ?Measurement technologies? - ?Multisource data? - ?Positioning? - ?Positioning information? - ?Working track

Classification code: 701 Electricity and Magnetism

Electricity and Magnetism

? - ?716.1 Information Theory and Signal Processing

Information Theory and Signal Processing

? - ?723.2 Data Processing and Image Processing

Data Processing and Image Processing

? - ?751.1 Acoustic Waves

Acoustic Waves

? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control

Agricultural Equipment and Methods; Vegetation and Pest Control

? - ?903.1 Information Sources and Analysis

Information Sources and Analysis

? - ?921 Mathematics

Mathematics

Numerical data indexing: Percentage 4.00e-01%, Size 1.25e-01m

DOI: 10.6041/j.issn.1000-1298.2017.01.004

Compendex references: YES

Database: Compendex

 

 

      

6. Effects of residual plastic film on infiltration and evaporation for sandy loam and sandy soil

Accession number: 20171203478172

Authors: Wang, Zhichao (1); Li, Xianyue (1); Shi, Haibin (1); Zhang, Dongliang (1); Xu, Pengcheng (1)

Author affiliation: (1) College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Huhhot; 010018, China

Corresponding author: Li, Xianyue(lixianyue80@126.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 198-205

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The residual plastic film seriously affected the soil water infiltration and evaporation. Five residual plastic film treatments were conducted to study the effects of different residual plastic film amounts (0 kg/hm2, 50 kg/hm2, 100 kg/hm2, 200 kg/hm2and 400 kg/hm2) on soil water infiltration and evaporation characteristics, and the infiltration front, infiltration rate, cumulative infiltration, cumulative evaporation and the evaporation rate were mainly studied based on the different residual plastic film quantities for sandy loam and sandy soil, and then the performance of main soil infiltration and evaporation model with residual plastic film was evaluated. The results showed that with the increase of residual plastic film quantity in the soil, the infiltration rates of sandy loam and sandy soil were decreased slowly, the time required for wetting front migration was increased significantly, and the sandy loam with 400 kg/hm2residual plastic film treatment (SL5) was increased by 27.56% compared with that of non-residual plastic film treatment (SL1) at 30 cm soil layer. In addition, the cumulative infiltration amount was significantly decreased (P<0.05) in the same infiltration time, and the cumulative infiltration amount of SL5 treatment was reduced by 52.01 mL (23.12%) compared with SL1 at the end of infiltration. The evaporation rate and cumulative evaporation were significantly reduced (P<0.05) with the increase of residual plastic film quantity, the cumulative evaporation rate of SL5 treatment was 30.63% less than that of SL1 after evaporation, and the influence of different residual plastic film amounts on sandy loam was greater than that of sandy soil. The four major soil water infiltration and evaporation model were evaluated, it was showed that both Kostiakov and Philip infiltration models can well simulate the soil water infiltration for the soil with residual plastic film, but the Philip model had better performance than Kostiakov model, and had better adaptability for sandy soil with plastic film residue. The fitting accuracy of Black evaporation model was decreased with the increase of residual plastic film quantity, but the Rose evaporation model was less influenced by the amount of residual plastic film. So it can be concluded that the Rose evaporation model was more suitable for the plastic film residual soil cumulative evaporation estimation. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 28

Main heading: Infiltration

Controlled terms: Evaporation? - ?Models? - ?Plastic films? - ?Sand? - ?Soil conditioners? - ?Soil moisture? - ?Soils

Uncontrolled terms: Cumulative infiltrations? - ?Evaporation estimation? - ?Infiltration fronts? - ?Infiltration models? - ?Plastic film residues? - ?Soil evaporations? - ?Soil textures? - ?Soil water

Classification code: 483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?802.3 Chemical Operations

Chemical Operations

? - ?817.1 Polymer Products

Polymer Products

Numerical data indexing: Percentage 2.31e+01%, Percentage 2.76e+01%, Percentage 3.06e+01%, Size 3.00e-01m

DOI: 10.6041/j.issn.1000-1298.2017.01.026

Compendex references: YES

Database: Compendex

 

 

      

7. Shape and position of sliding interface for transient flow simulation of centrifugal pump

Accession number: 20171203478157

Authors: Wang, Chaoyue (1); Wang, Fujun (1, 2)

Author affiliation: (1) College of Water Resources and Civil Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, Beijing; 100083, China

Corresponding author: Wang, Fujun(wangfj@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 81-88

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Sliding mesh method is one of the most important methods for analyzing transient rotor-stator coupling of centrifugal pump. The shape and position of sliding mesh interface have direct impacts on the calculation results of transient flow field. However, until now there was no uniform view on how to select the sliding mesh interface. A centrifugal pump was taken as study object. Five different sliding mesh interface schemes were used to simulate the transient flow field. Results showed that the average simulation errors of pump efficiencies for scheme I (i.e., the short line-shaped interface close to impeller outlet) and scheme V (i.e., the inverted U-shaped interface surrounding impeller) were both about 1%. The streamlines in meridian plane and velocities in volute inlet for both schemes were in line with existed experimental results. Specially, the scheme V can give more reasonable gradient of velocity in pump chamber, and gain right results of pressure fluctuation in tongue area. Both scheme III (i.e., the long line-shaped interface close to impeller outlet) and scheme IV (i.e., the long line-shaped interface close to base circle of spiral casing) set the pump chamber to a rotating domain, and gave the simulation errors of pump efficiency as 5.2% and 9.2%, respectively, which also resulted in incorrect streamlines in meridian plane. Both scheme IV and scheme II (i.e., the short line-shaped interface close to base circle of volute casing) set the rotating domain close to tongue, and caused shearing action of tongue to be enlarged. The inlet velocities in tongue area were decreased seriously. In summary, the schemes that made the entire pump chamber into rotating domain or made the interface close to the tongue would make the simulation results unreasonable. The scheme taking the inverted U-shaped interface surrounding impeller as interface was suggested. This scheme can guarantee the simulation accuracy and reflect the real characteristics of the flow field. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: Pumps

Controlled terms: Centrifugal pumps? - ?Efficiency? - ?Flow fields? - ?Flow measurement? - ?Impellers? - ?Mesh generation? - ?Transient analysis? - ?Transition flow

Uncontrolled terms: Calculation results? - ?Interface schemes? - ?Pressure fluctuation? - ?Rotor-stator coupling? - ?Simulation accuracy? - ?Sliding interfaces? - ?Sliding mesh methods? - ?Transient flow fields

Classification code: 601.2 Machine Components

Machine Components

? - ?618.2 Pumps

Pumps

? - ?631.1 Fluid Flow, General

Fluid Flow, General

? - ?723.5 Computer Applications

Computer Applications

? - ?913.1 Production Engineering

Production Engineering

Numerical data indexing: Percentage 1.00e+00%, Percentage 5.20e+00%, Percentage 9.20e+00%

DOI: 10.6041/j.issn.1000-1298.2017.01.011

Compendex references: YES

Database: Compendex

 

 

      

8. Numerical investigation of gas-liquid two-phase flow in centrifugal pumps based on inhomogeneous model

Accession number: 20171203478158

Authors: Yuan, Jianping (1); Zhang, Keyu (1); Si, Qiaorui (1); Zhou, Banglun (1); Tang, Yuanfeng (1); Jin, Zhongkun (2)

Author affiliation: (1) National Research Center of Pumps, Jiangsu University, Zhenjiang; 212013, China; (2) Institute of Acoustics, Chinese Academy of Sciences, Beijing; 100190, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 89-95

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to study the flow characteristics of centrifugal pumps when transporting the gas-liquid mixture, water and air were chosen as the working medium, numerical simulation was conducted on a centrifugal pump under different conditions of inlet gas volume fraction (IGVF) based on the Eulerian-Eulerian inhomogeneous model. The drag force was approximated by the Schiller Nauman model. No other interfacial forces were considered. The gas distribution and velocity streamline in the impeller were obtained to discuss the gas and water flow characteristics of the pump. The results showed that gas concentration was high at the inlet pressure side of the blade, where the vortex would exist, indicating that the gas concentration had a great relationship with the vortex aggregation in the impeller passages. When the IGVF was increased to 10%, phase separation had obviously appeared at the suction side of the blades in the impeller passages, and gas had a movement trend along the suction side to the outlet of the impeller. Gas was moved from the center of the passages to the front and back shroud, and with IGVF increased, gas fraction in the back shroud near the leading edge and back shroud would be increase. Gas fraction in the front shroud near the trading edge was increased significantly than that in the back shroud, and the gas may eventually choke the passages. Within a rotation period, the outlet pressure of impeller was cyclically changed, when IGVF was increased from 1% to 10%, the outlet pressure of impeller was gradually decreased, and pressure pulsation frequency of the monitors was near the blade passing frequency at different IGVF values. When the IGVF was not higher than 10%, IGVF had no obvious effects on the pressure pulsation frequency and time frequency of the monitoring points. By comparing the experimental results with the numerical results, the reliability of the mathematical model and calculation methods was confirmed. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 18

Main heading: Gases

Controlled terms: Centrifugal pumps? - ?Computer simulation? - ?Drag? - ?Flow of water? - ?Impellers? - ?Liquids? - ?Numerical methods? - ?Numerical models? - ?Phase separation? - ?Pumps ? - ?Two phase flow? - ?Vortex flow

Uncontrolled terms: Blade passing frequency? - ?Eulerian-Eulerian? - ?Flow charac-teristics? - ?Gas - liquid two-phase flows? - ?Gas-liquid transportations? - ?Modeling and calculations? - ?Numerical investigations? - ?Pressure pulsation

Classification code: 601.2 Machine Components

Machine Components

? - ?618.2 Pumps

Pumps

? - ?631.1 Fluid Flow, General

Fluid Flow, General

? - ?631.1.1 Liquid Dynamics

Liquid Dynamics

? - ?641.1 Thermodynamics

Thermodynamics

? - ?723.5 Computer Applications

Computer Applications

? - ?921 Mathematics

Mathematics

? - ?921.6 Numerical Methods

Numerical Methods

Numerical data indexing: Percentage 1.00e+00% to 1.00e+01%, Percentage 1.00e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.012

Compendex references: YES

Database: Compendex

 

 

      

9. Optimization design of mechanical ventilation for multi-span plastic greenhouses in southern china during summer

Accession number: 20171203478179

Authors: Huang, Zhenyu (1); Gao, Haotian (1); Zhu, Senlin (1); Zhao, Chunyu (1); Cai, Chunhua (2)

Author affiliation: (1) School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China; (2) Shanghai Pudong Modern Agriculture Greenhouse Engineering Technology Company, Shanghai; 201210, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 252-259 and 182

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Due to the long-term summer in southern China, the crops in greenhouses suffer from high temperature seriously. In order to improve the cooling effect and reduce the energy consumption of ventilation, it is necessary to optimize the design and control strategy for the mechanical ventilation system of greenhouses. A full-scale 3-D transient and steady CFD simulation model was established for a typical multi-span plastic greenhouse in southern China. By using evenly distributed temperature, humidity and light sensors inside and outside the greenhouse, the variation and distribution of temperature driven by the mechanical ventilation were measured. The comparison between the experimental and simulation results showed that the CFD model was valid. Under the high ambient temperature, the CFD model was carried out to investigate the impact of design parameters, such as the number of working fans, length of greenhouse, inlet temperature and outside environment temperature, on cooling effect of mechanical ventilation. And then the cooling effect under different control strategies of mechanical ventilation was simulated to reduce the energy consumption. The proposed CFD model can provide optimized parameters for the design and control of multi-span plastic greenhouse mechanical ventilation in summer, which can be applied to improve the cooling effect and reduce energy consumption of ventilation. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 13

Main heading: Ventilation

Controlled terms: Computational fluid dynamics? - ?Cooling? - ?Energy utilization? - ?Greenhouse effect? - ?Greenhouses? - ?Offshore pipelines

Uncontrolled terms: Distribution of temperature? - ?Environment temperature? - ?Mechanical ventilation? - ?Mechanical ventilation system? - ?Optimization design? - ?Optimized parameter? - ?Plastic greenhouse? - ?Reduce energy consumption

Classification code: 451 Air Pollution

Air Pollution

? - ?511.2 Oil Field Equipment

Oil Field Equipment

? - ?525.3 Energy Utilization

Energy Utilization

? - ?641.2 Heat Transfer

Heat Transfer

? - ?643.5 Ventilation

Ventilation

? - ?723.5 Computer Applications

Computer Applications

? - ?821.6 Farm Buildings and Other Structures

Farm Buildings and Other Structures

DOI: 10.6041/j.issn.1000-1298.2017.01.033

Compendex references: YES

Database: Compendex

 

 

      

10. Theoretical analysis and experiment of air tightness of multi-temperature refrigerated truck

Accession number: 20171203478184

Authors: Liu, Guanghai (1); Xie, Ruhe (1); Zou, Yifeng (1); Qu, Ruigui (2)

Author affiliation: (1) Research Center for Cold Chain and Standardization, Guangzhou University, Guangzhou; 510006, China; (2) School of Traffic and Transportation Engineering, Central South University, Changsha; 410075, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 289-296

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The model of air leakage flow was constructed based on air infiltration mechanism of multi-temperature refrigerated truck. Theoretical analyses and experimental measurement were conducted with the established model, such as internal partition coefficient, load coefficient, internal flow disturbance coefficient, heat pressure difference and other parameters. It was shown that the air leakage rate was mainly affected by air tightness of the vehicle itself, speed, internal partition, loading condition and airflow disturbance. Specifically, the internal partition could improve air tightness of the vehicle with diminishing utility. The internal partition coefficient was 0.6~0.9 in double temperature refrigerated truck, and it was 0.45~0.85 in the three temperature refrigerated truck. The internal loading capacity had limited effect on air infiltration. The load coefficient was 0.98, 0.96, 0.92 and 0.87 when load was 25%, 50%, 75% and 100%, respectively. The influences of internal airflow disturbance were different with different speeds. The internal flow disturbance coefficient was 0.68, 0.85, 0.94, 0.97 and 0.98 when speed was 20 km/h, 40 km/h, 60 km/h, 80 km/h and 100 km/h, respectively. Since the multi-temperature refrigerated truck used for city distribution is often at low speed, the internal circulation wind could stop air leakage at a certain degree. In addition, the heat pressure difference caused by temperature difference between inside and outside of the truck was small because the height of refrigerated truck was small. Theoretical analyses showed that temperature difference of 25 K corresponded to pressure difference of 1 Pa. Such effect was so insignificant in engineering practice that the air infiltration of refrigerated truck can be regarded approximately as a result of simple wind pressure. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 17

Main heading: Trucks

Controlled terms: Experiments? - ?Leakage (fluid)? - ?Structural dynamics? - ?Wind effects

Uncontrolled terms: Air leakage? - ?Airtight ness? - ?Engineering practices? - ?Influencing factor? - ?Internal circulations? - ?Internal partitions? - ?Pressure differences? - ?Temperature differences

Classification code: 408 Structural Design

Structural Design

? - ?443.1 Atmospheric Properties

Atmospheric Properties

? - ?663.1 Heavy Duty Motor Vehicles

Heavy Duty Motor Vehicles

? - ?901.3 Engineering Research

Engineering Research

Numerical data indexing: Percentage 1.00e+02%, Percentage 2.50e+01%, Percentage 5.00e+01%, Percentage 7.50e+01%, Pressure 1.00e+00Pa, Temperature 2.50e+01K, Velocity 1.11e+01m/s, Velocity 1.67e+01m/s, Velocity 2.22e+01m/s, Velocity 2.78e+01m/s, Velocity 5.56e+00m/s

DOI: 10.6041/j.issn.1000-1298.2017.01.038

Compendex references: YES

Database: Compendex

 

 

      

11. Analysis and experiment of guiding and dropping migratory mechanism on pickup finger precision seed metering device for corn

Accession number: 20171203478151

Authors: Wang, Jinwu (1); Tang, Han (1); Wang, Jinfeng (1); Shen, Hongguang (1); Feng, Xin (1); Huang, Huinan (1)

Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China

Corresponding author: Wang, Jinfeng(jinfeng_w@126.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 29-37 and 46

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to improve the guiding migration performance of pickup finger precision seed metering device, the steady migratory mechanism of guiding-seed system was studied. The kinematics and dynamics models of guiding-seed and dropping-seed processes were established based on its working principle. The influences of various factors on dropping trajectory and migration stability were analyzed. The quadratic general rotary unitized design was carried out by taking the rotational speed of seed meter and tilt angle as experiment factors, and the seeding qualified index and variation coefficient as experiment indexes. Based on experimental data, a mathematical model was built by using the Design-Expert 6.0.10 software, and the experiment factors were optimized, the best combination was achieved. On this basis, a kind of dropping trajectory measuring test platform was designed and built based on the theory of mirror reflection. And then the three-dimensional space velocities of the falling corn were measured and analyzed by high-speed photography and target tracking technology. The single factor tests for factors, including rotational speed and tilt angle, were carried out and the corresponding regression equations were obtained by analysis. Experimental results showed that when the rotational speed was between 15 r/min and 45 r/min and the tilt angle was 0°, the horizontal displacements of trajectories of frontal and profile dropping seed were increased with the increase of rotational speed and the variation coefficient of seeding was decreased with the increase of rotational speed. As the rotational speed was greater than 35 r/min, the trajectories and landing positions of corn grains were gradually discrete and the variation coefficient of seeding was significantly increased, and its horizontal displacements of frontal trajectory were stabilized within the range of 12.9~14.3 mm, the horizontal displacements of profile trajectory were stabilized within the range of 3.7~4.8 mm, and the average variation coefficient was 15.13%. The dropping seed angle was decreased with the increase of tilt angle at rotational speed of 30 r/min and tilt angle of -12°~12°. The results can provide guidance and direction for the research of mechanical precision seed metering device and its seed tube. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: High speed photography

Controlled terms: Experiments? - ?Mechanisms? - ?Optical testing? - ?Pickups? - ?Pneumatic materials handling equipment? - ?Speed? - ?Target tracking? - ?Trajectories

Uncontrolled terms: Corn? - ?Dropping trajectory? - ?Horizontal displacements? - ?Kinematics and dynamics? - ?Mechanical precision? - ?Precision seed-metering devices? - ?Three dimensional space? - ?Variation coefficient

Classification code: 601.3 Mechanisms

Mechanisms

? - ?632.4 Pneumatic Equipment and Machinery

Pneumatic Equipment and Machinery

? - ?741.3 Optical Devices and Systems

Optical Devices and Systems

? - ?742.1 Photography

Photography

? - ?901.3 Engineering Research

Engineering Research

Numerical data indexing: Percentage 1.51e+01%, Rotational_Speed 1.50e+01RPM, Rotational_Speed 3.00e+01RPM, Rotational_Speed 3.50e+01RPM, Rotational_Speed 4.50e+01RPM, Size 1.29e-02m to 1.43e-02m, Size 3.70e-03m to 4.80e-03m

DOI: 10.6041/j.issn.1000-1298.2017.01.005

Compendex references: YES

Database: Compendex

 

 

      

12. Detecting method for plant water stress with chlorophyll fluorescence kinetics based on imaging

Accession number: 20171203478165

Authors: Zhou, Chunyan (1, 2); Hua, Dengxin (1); Le, Jing (1); Yan, Qing (1); Mao, Jiandong (2); Jing, Min (1)

Author affiliation: (1) School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an; 710048, China; (2) School of Electrical and Information Engineering, North University of Nationalities, Yinchuan; 750021, China

Corresponding author: Hua, Dengxin(xauthdx@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 148-154

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Chlorophyll fluorescence is a useful indicator as it gives important information about the stress and health state of plant. In order to detect plant water stress and growth state accurately and intuitively, plants under different drought stress conditions were experimented by using chlorophyll fluorescence imaging method combined with the chlorophyll fluorescence kinetics parameters. The chlorophyll fluorescence was excited by 460 nm LEDs, and acquired by EMCCD equipped with 690 nm band pass filter. The average pixel value was calculated for each image of 4 000 pictures which were acquired in four different sampling periods individually. The intensity of each image was plotted according to the time sequence, thus the chlorophyll fluorescence kinetics curve could be concluded, and chlorophyll fluorescence kinetics parameters could be calculated. Meanwhile, images were processed for noise reduction, calculation of multiplication and division and so on. And then they were displayed by pseudo color, thus various factors led to uneven distribution of fluorescence could be intuitively analyzed. Fast water stress and slow water stress experiments were conducted for easy to dehydrate and not easy to water loss leaves, respectively. The results showed that the fluorescence ratio Rfdand the time of second peak of kinetics curve were changed with the increase of stress, and both had high fitting determination coefficient with leaf water content (0.86 and 0.98). Therefore, the method combined the chlorophyll fluorescence imaging with chlorophyll fluorescence kinetics parameters could improve the accuracy and intuition of plant drought stress earlier prediction, and it could be a rapid means of remote sensing for site continuous monitoring the growth status of plants, all kinds of stress, pest and disease and so on. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 11

Main heading: Plants (botany)

Controlled terms: Bandpass filters? - ?Chlorophyll? - ?Curve fitting? - ?Drought? - ?Fluorescence? - ?Growth kinetics? - ?Kinetics? - ?Noise abatement? - ?Remote sensing

Uncontrolled terms: Chlorophyll fluorescence? - ?Chlorophyll fluorescence imaging? - ?Continuous monitoring? - ?Determination coefficients? - ?Drought stress conditions? - ?Fluorescence kinetics? - ?Plant water stress? - ?Water stress

Classification code: 444 Water Resources

Water Resources

? - ?703.2 Electric Filters

Electric Filters

? - ?741.1 Light/Optics

Light/Optics

? - ?751.4 Acoustic Noise

Acoustic Noise

? - ?804.1 Organic Compounds

Organic Compounds

? - ?921.6 Numerical Methods

Numerical Methods

? - ?931 Classical Physics; Quantum Theory; Relativity

Classical Physics; Quantum Theory; Relativity

Numerical data indexing: Size 4.60e-07m, Size 6.90e-07m

DOI: 10.6041/j.issn.1000-1298.2017.01.019

Compendex references: YES

Database: Compendex

 

 

      

13. Effects of plastic film mulching and plant density on yield and evapotranspiration of rainfed spring maize

Accession number: 20171203478173

Authors: Ren, Xinmao (1, 2); Sun, Dongbao (1, 2); Wang, Qingsuo (1, 2)

Author affiliation: (1) Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing; 100081, China; (2) Key Laboratory of Dryland Agriculture, Ministry of Agriculture, Beijing; 100081, China

Corresponding author: Wang, Qingsuo(wangqingsuo@caas.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 206-211

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Concerning the increasing of plant density is one of important ways to achieve high yield, field experiments were conducted to investigate the effects of increasing plant density and plastic film mulching on the growth and yield of spring maize, and crop evapotranspiration. The results showed that film mulching accelerated growth and development of maize. It also increased height and leaf area index of the plant at early growth stage of maize. At the late growth stage of maize, plant height of maize without film mulching was decreased with the increase of density, but no significant difference was found for plastic film mulching. Whether mulching or un-mulching, leaf area index of maize was increased with the increase of the density. Evapotranspiration increased with the increase of the density, however, film mulching reduced consumption of water and alleviated the contradiction between increase of water consumption because of the increased plant density and plant height and insufficient precipitation. Film mulching significantly increased maize yield and water use efficiency by 52.79% and 60.55% compared with un-mulching. The grain yield and the water use efficiency of un-mulching and film mulching treatments were all increased with the increase of the plant density until a plateau and then declined. The difference was that the maximum yield of un-mulching was 8 466.02 kg/hm2and it was achieved at 52 500 plants/hm2, however, the maximum yield of film mulching was 12 778.47 kg/hm2and it was achieved at 82 500 plants/hm2. As a result, the optimum planting densities on eastern Loess Plateau for film mulching and un-mulching of spring maize were 52 500 plants/hm2and 82 500 plants/hm2. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Film growth

Controlled terms: Efficiency? - ?Evapotranspiration? - ?Forestry? - ?Plastic films? - ?Water supply

Uncontrolled terms: Crop evapotranspiration? - ?Growth and development? - ?Plant densities? - ?Plastic film mulching? - ?Spring maize? - ?Water consumption? - ?Water use efficiency? - ?Yield

Classification code: 446.1 Water Supply Systems

Water Supply Systems

? - ?817.1 Polymer Products

Polymer Products

? - ?913.1 Production Engineering

Production Engineering

Numerical data indexing: Percentage 5.28e+01%, Percentage 6.05e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.027

Compendex references: YES

Database: Compendex

 

 

      

14. 3-PRRR translational parallel mechanism with constant Jacobian matrix and its transfer performance analysis

Accession number: 20171203478190

Authors: Zhao, Yanzhi (1, 2); Liang, Bowen (1, 2); Cao, Yachao (1, 2); Zhao, Tieshi (1, 2)

Author affiliation: (1) Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System, Yanshan University, Qinhuangdao; 066004, China; (2) Key Laboratory of Advanced Forging & Stamping Technology and Science, Ministry of Education, Yanshan University, Qinhuangdao; 066004, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 333-338 and 367

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: A novel 3-PRRR three-dimensional translational parallel mechanism was proposed. Its Jacobian matrix was constant, when its prismatic pairs were chosen as the actuators. The degrees of freedom of the parallel mechanism was analyzed based on screw theory. The forward/inverse kinematic solution models were established to obtain its workspace by the vector method. Jacobian matrix of the mechanism was solved by the main twist screw and transmission wrench screw. Then, the curves of the output speed and force were drawn. According to the figures, the curves were completely coincident in different poses when the input parameters were certain. Thus, the conclusion that the Jacobian matrix of the 3-PRRR parallel mechanism kept constant was verified. On this basis, the transmissibility performance of the mechanism was further analyzed in order to obtain relationship between transmission power and angle β (the angle between axis of the prismatic pair and its nearest pair-the revolute pair ) of each limb. Finally, another important conclusion was got. It can be expressed as: when the input power was definite and invariant, the transmission power of the mechanism was decreased with the increase of β. Comparison was made between output speed and force curves in two cases that β were equal to 0° and 30°, the transmissibility performance of the mechanism varied with β and the former was better than the latter. Similarly, after the transmissibility performances with other values of β were analyzed, the performance was optimal when β was 0°. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 18

Main heading: Jacobian matrices

Controlled terms: Degrees of freedom (mechanics)? - ?Mechanisms? - ?Screws

Uncontrolled terms: Input parameter? - ?Kinematic solutions? - ?Parallel mechanisms? - ?Screw theory? - ?Transfer performance? - ?Translational parallel mechanisms? - ?Transmissibility performance? - ?Transmission power

Classification code: 601.3 Mechanisms

Mechanisms

? - ?605 Small Tools and Hardware

Small Tools and Hardware

? - ?921.1 Algebra

Algebra

? - ?931.1 Mechanics

Mechanics

DOI: 10.6041/j.issn.1000-1298.2017.01.044

Compendex references: YES

Database: Compendex

 

 

      

15. Modeling and optimization design of hydraulically interconnected energy-regenerative suspension

Accession number: 20171203478186

Authors: Chen, Long (1); Zhang, Chenglong (1); Wang, Ruochen (1); Ye, Qing (1); Niu, Limin (2)

Author affiliation: (1) School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang; 212013, China; (2) School of Mechanical Engineering, Anhui University of Technology, Maanshan; 243000, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 303-308

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to meet the energy recovery and performance optimization of hydraulically interconnected suspension, a hydraulically interconnected energy-regenerative suspension was proposed. Combined with the structural characteristics of the reverse interconnected suspension, the energy-regenerative mechanism was introduced, and the dynamic model of a 4-DOF vehicle suspension was established. The vehicle dynamic performance and the energy-regenerative effect were simulated by using the joint simulation AMEsim/Simulink. The α-method was used to calculate the weight coefficient of evaluation indexes. The parameters of the spring stiffness and hydraulic cylinder diameter were extracted from eight potential parameters by means of design of experiment to perform optimization with genetic algorithm in Isight. Both vehicle dynamic performance and energy-regenerative effect were optimized. Based on simulative computation, the bench test of full vehicle was carried out under linear condition on a random road using the 4-poster road simulator. The results showed that the vehicle dynamic performance of the new suspension was slightly worse than that of the traditional interconnected suspension, but it can meet the most road conditions and recover part of vibration energy under the premise of maintaining ride comfort. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 16

Main heading: Suspensions (components)

Controlled terms: Automobile suspensions? - ?Design of experiments? - ?Genetic algorithms? - ?Magnetic levitation vehicles? - ?Mechanisms? - ?Roads and streets? - ?Transportation? - ?Vehicle performance? - ?Vehicle suspensions? - ?Vehicles ? - ?Vibrations (mechanical)

Uncontrolled terms: Bench tests? - ?Cosimulation? - ?Energy-regenerative suspensions? - ?Integrated optimization? - ?Interconnected suspensions? - ?Performance optimizations? - ?Structural characteristics? - ?Vehicle dynamic performance

Classification code: 406.2 Roads and Streets

Roads and Streets

? - ?601.2 Machine Components

Machine Components

? - ?601.3 Mechanisms

Mechanisms

? - ?662.1 Automobiles

Automobiles

? - ?662.4 Automobile and Smaller Vehicle Components

Automobile and Smaller Vehicle Components

? - ?901.3 Engineering Research

Engineering Research

? - ?931.1 Mechanics

Mechanics

DOI: 10.6041/j.issn.1000-1298.2017.01.040

Compendex references: YES

Database: Compendex

 

 

      

16. Dynamic modeling and simulation of flexible multi-link mechanism including joints with clearance for ultra-precision press

Accession number: 20171203478196

Authors: Zheng, Enlai (1); Zhang, Hang (1); Zhu, Yue (1); Kang, Min (1)

Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China

Corresponding author: Kang, Min(kangmin@njau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 375-385

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: It’s essential to establish a dynamic model of flexible multi-link mechanism with clearance for ultra-precision press to analyze its dynamic response. Traditionally, the rigid model of multi-link mechanism often neglects the effect of revolute and spherical clearance joints, and flexibility of crank shaft and linkage, which reduces the analysis precision. To investigate its dynamics more accurately, an improved dynamic model of flexible multi-link mechanism with clearance was established, which considered the effect of revolute and spherical clearance joints, and flexibility of crank shaft and linkage. It was demonstrated that the revolute and spherical clearance affected the dynamic response of the mechanism dramatically and the motion of the crank shaft center and ball center of spherical joint were mainly characterized by only two phases: free flight and impact motion. In addition, the influence of the clearance size and speed of crank shaft on the dynamic characteristics of the multi-link mechanism was also investigated. The results showed that with the increase of the clearance size, the position of the slider’s lower dead center was moved up simultaneously, the peak values of velocity and acceleration were decreased to a minimum and then increased with the increase of clearance size and speed. With the increase of crankshaft speed, the position of the slider’s lower dead center and the maximum deviation value were also increased gradually, and the values of velocity and acceleration were increased significantly. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Dynamics

Controlled terms: Crankshafts? - ?Dynamic models? - ?Dynamic response? - ?Free flight? - ?Presses (machine tools)? - ?Spheres

Uncontrolled terms: Clearance? - ?Clearance joints? - ?Crankshaft speed? - ?Dynamic characteristics? - ?Dynamic model and simulation? - ?Multi link mechanisms? - ?Revolute joints? - ?Spherical joint

Classification code: 601.2 Machine Components

Machine Components

? - ?603.1 Machine Tools, General

Machine Tools, General

? - ?651.1 Aerodynamics, General

Aerodynamics, General

? - ?921 Mathematics

Mathematics

DOI: 10.6041/j.issn.1000-1298.2017.01.050

Compendex references: YES

Database: Compendex

 

 

      

17. Effect of deficit irrigation on growth and water-radiation use of arabica coffee under different shading

Accession number: 20171203478171

Authors: Liu, Xiaogang (1); Wan, Mengdan (1); Qi, Yuntao (1); Yang, Qiliang (1); Liu, Yanwei (1)

Author affiliation: (1) Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming; 650500, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 191-197 and 190

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Arabica coffee has the habit of shading cultivation and its growth often is inhibited by soil drought stress. Shade changes micro-climate of coffee growth and further affects photosynthetic characteristics and water consumption. The object was to explore suitable management mode of water and light, using three levels of deficit irrigation, i.[KG-*4]e.[KG-*4], light deficit irrigation (DIL, (65%~75%) field capacity), medium deficit irrigation (DIM, (55%~65%) field capacity) and severe deficit irrigation (DIS, (45%~55%) field capacity), respectively, and three levels of shade, i.[KG-*4]e.[KG-*4], no shade (S0, natural light), light shade (SL, 50% natural light) and severe shade (SS, 30% natural light). The effect of deficit irrigation and shading levels on daily mean photosynthetic characteristics, growth and water-radiation use efficiency of arabica coffee was studied by pot experiments, and regression model was established under different deficit irrigation and shade levels. The results showed that compared with DIL, DISreduced coffee leaf net photosynthetic rate, stomatal conductance and radiation use efficiency by 17.61%, 22.99% and 27.43%, respectively, and reduced the total dry mass by 6.29%, but DIMhad no significant effects on leaf net photosynthetic rate, stomatal conductance, radiation use efficiency and total dry mass. Leaf radiation use efficiency of S0was the lowest, SLwas the second and SSwas the highest. S0or SSinhibited net leaf photosynthetic rate and water use efficiency, and SLincreased dry mass by 11.14%. Compared with DILS0, shading under deficit irrigation reduced leaf transpiration rate but increased light use efficiency significantly. Leaf radiation use efficiency showed a significant exponential relation with photosynthetically active radiation. Irrigation water use efficiency was increased first and then decreased with the increase of water deficit level and shading degree. On the basis of high dry mass accumulation and water use efficiency, the suitable mode of water and light management of arabica coffee was the combination of light deficit irrigation and light shade (DILSL). The study results can provide scientific basis for irrigation and shade management of arabica coffee. In addition, this experiment was only focused on coffee growth, dry matter and water-radiation use, and yield, quality and flavor were not involved. Further systematic discussion of arabica coffee was needed under different irrigation and shade conditions. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Irrigation

Controlled terms: Efficiency? - ?Plants (botany)? - ?Radiation? - ?Radiation effects? - ?Regression analysis? - ?Water management? - ?Water resources? - ?Water supply

Uncontrolled terms: Deficit irrigation? - ?Photosynthetic characteristics? - ?Radiation coupling? - ?Radiation use? - ?Shading

Classification code: 444 Water Resources

Water Resources

? - ?446.1 Water Supply Systems

Water Supply Systems

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?913.1 Production Engineering

Production Engineering

? - ?922.2 Mathematical Statistics

Mathematical Statistics

Numerical data indexing: Percentage 1.11e+01%, Percentage 1.76e+01%, Percentage 2.30e+01%, Percentage 2.74e+01%, Percentage 3.00e+01%, Percentage 5.00e+01%, Percentage 6.29e+00%

DOI: 10.6041/j.issn.1000-1298.2017.01.025

Compendex references: YES

Database: Compendex

 

 

      

18. Dynamics optimization and experiment of planting device driven by planetary eccentric gears and elliptic gears

Accession number: 20171203478152

Authors: Wang, Ying (1); Xia, Xudong (2); He, Xiaojing (2); Zhao, Xiong (2); Chen, Jianneng (2)

Author affiliation: (1) Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo; 315211, China; (2) College of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou; 310018, China

Corresponding author: Chen, Jianneng(jiannengchen@zstu.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 38-46

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Planting devices driven by double-stage planetary non-circular gear pairs can meet the requirements of ideal planting better. A total of 25 kinds of planting devices can be obtained by using gear pair composed of elliptic gear and conjugated non-circular gear, eccentric gear and conjugated non-circular gear, Pascal curve non-circular gears, Fourier curve non-circular gears or sinusoidal non-circular gears, which were used to design this type of planting device. To quickly and easily get structural parameters that can make the planting devices meet the requirements of ideal planting, kinematic multi-objective parameter optimization model was established, but the optimization results were a set of Pareto solutions. To obtain the optimal structural parameters, dynamic analysis and optimization should be implemented. So the planting device driven by eccentric gears and elliptic gears, whose first-stage planetary gear pair was composed of eccentric gear and conjugated non-circular gear and second-stage planetary gear pair was composed of elliptic gear and conjugated non-circular gear, was chosen as the research object. Its dynamic analysis model and optimization model were deduced firstly. Then dynamic optimization of this device was implemented and the optimal structural parameters were obtained. During the process of optimization, the constraint conditions were got form its Pareto solutions of kinematic optimization. A test bed for measurement of dynamics characteristics of planting device was manufactured based on the optimal parameters, and the force on the support was tested when the speed was 40 r/min. The comparison between the results of test and theoretical analysis showed that the dynamic analysis model was reliable and it was able to provide reliable mathematical model for dynamic optimization. The research also provided theoretical basis and experiment instructs for other kinds of planting devices driven by double-stage planetary non-circular gear pairs. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 15

Main heading: Structural optimization

Controlled terms: Dynamics? - ?Experiments? - ?Gears? - ?Kinematics? - ?Optimization? - ?Structural analysis

Uncontrolled terms: Dynamic analysis models? - ?Dynamics analysis? - ?Dynamics characteristic? - ?Kinematic optimization? - ?Multi-objective parameter optimizations? - ?Non-circular gears? - ?Planting device? - ?Seedling transplanter

Classification code: 408.1 Structural Design, General

Structural Design, General

? - ?601.2 Machine Components

Machine Components

? - ?901.3 Engineering Research

Engineering Research

? - ?921.5 Optimization Techniques

Optimization Techniques

? - ?931.1 Mechanics

Mechanics

Numerical data indexing: Rotational_Speed 4.00e+01RPM

DOI: 10.6041/j.issn.1000-1298.2017.01.006

Compendex references: YES

Database: Compendex

 

 

      

19. Age discrimination of vinegar based on artificial olfaction visualization and image processing

Accession number: 20171203478182

Authors: Lin, Hao (1); Song, Benteng (1); Jin, Hongjuan (1); Guan, Binbin (1)

Author affiliation: (1) School of Food and Biological Engineering, Jiangsu University, Zhenjiang; 212013, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 275-280

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: An artificial olfaction system based on visualization sensor array was employed to identify different ages of vinegar. In the image processing module of this system, the influence of different methods on the localization of the target image center was compared, including minimum enclosing rectangle, ellipse fitting and one-order moment. Since the target image was similar to the circle, all of the three methods could obtain center coordinates exactly, except that the last method consumed less time. Moreover, the characteristic region was reselected, which could better represent features of the target image. Usually, feature values are extracted based on the RGB color space. Then, each component and coordinate value in RGB, HSV and Lab color spaces were extracted and used as eigenvalues. The result showed that the data obtained from the Lab space had high stability. In order to identify different ages of vinegar, five different years of vinegar samples from 2011 to 2015 were selected in the experiment. The characteristic data from three kinds of color spaces was analyzed with principal component analysis (PCA) and linear discriminant analysis (LDA). Although the samples of vinegar in different years had a certain clustering tendency, especially in the Lab color space, there were still some samples overlapping each other and difficult to separate by PCA alone. Then this data was used as the input of LDA classifier for discriminate analysis. The recognition accuracy rate in the training set and testing set achieved 98% and 94% respectively in Lab color space, while the detection accuracies were not higher than 90% in other color spaces. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 17

Main heading: Image processing

Controlled terms: Acetic acid? - ?Color? - ?Discriminant analysis? - ?Eigenvalues and eigenfunctions? - ?Electronic nose? - ?Error detection? - ?Laboratories? - ?Principal component analysis? - ?Visualization

Uncontrolled terms: Artificial olfaction? - ?Characteristic regions? - ?Discriminate analysis? - ?Image Processing Module? - ?Linear discriminant analysis? - ?Minimum enclosing rectangle? - ?Recognition accuracy? - ?Vinegar age

Classification code: 741.1 Light/Optics

Light/Optics

? - ?801 Chemistry

Chemistry

? - ?804.1 Organic Compounds

Organic Compounds

? - ?922 Statistical Methods

Statistical Methods

? - ?922.2 Mathematical Statistics

Mathematical Statistics

Numerical data indexing: Percentage 9.00e+01%, Percentage 9.40e+01%, Percentage 9.80e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.036

Compendex references: YES

Database: Compendex

 

 

      

20. Automatic measurement method for maize ear development degree based on random forest

Accession number: 20171203478168

Authors: Shi, Lijuan (1); Lu, Jun (2)

Author affiliation: (1) College of Informatics, Huazhong Agricultural University, Wuhan; 430070, China; (2) College of Basic Sciences, Huazhong Agricultural University, Wuhan; 430070, China

Corresponding author: Lu, Jun(lujun5918@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 169-174

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In the process of maize breeding, the development degree of maize ear is one of the most important parameters for yield related traits. In order to improve the degree of automation and accuracy of maize ear development degree detection, a measurement method was proposed based on machine vision technology. An identification model was constructed on the basis of random forest principal at first. The model was composed of a group of weak classifiers which were independent and identically distributed. The weak classifiers selected samples from the input training samples randomly along columns and rows. The experiment which compared random forest model with decision tree model on the classification effect showed that random forest classifier could not only avoid over-fitting and local convergence effectively but also have good generalization ability. Then, in order to determine the optimal number of weak classifiers, six random forest models were built. Their weak classifier number were separately one-eightieth, one-fortieth, one-twentieth, one-tenth, one-fifth, one-fourth of training samples count. The results showed that the model had good accuracy and stability when the number of weak classifiers was one-twentieth of training samples count. Finally, the optimal random forest model was used as the classifier to build the automatic maize ear development degree detection method. The experiment results showed that the measurement accuracy on length of each area was more than 95% and the measurement speed was more than 30 maize ears per minute. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Decision trees

Controlled terms: Sampling

Uncontrolled terms: Automatic measurement methods? - ?Decision tree modeling? - ?Development degree? - ?Generalization ability? - ?Maize ears? - ?Multiple classifiers? - ?Random forest classifier? - ?Random forests

Classification code: 961 Systems Science

Systems Science

Numerical data indexing: Percentage 9.50e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.022

Compendex references: YES

Database: Compendex

 

 

      

21. Relationship between quality change and glass transition during heat pump drying of penaeus vannamei meat

Accession number: 20171203478185

Authors: Shi, Qilong (1); Zhao, Ya (1); Wei, Yanjun (1)

Author affiliation: (1) School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo; 255000, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 297-302

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: During heat pump drying (HPD) of Penaeus vannamei meat physical and chemical changes are destined to occur which result in a decreased quality attributes. However, the mechanism of quality degradation was not explicated. The gravimetric method and differential scanning calorimetry were employed to investigate the moisture desorption isotherm and the glass transition temperature (Tg) of Penaeus vannamei meat, respectively. GAB model and Gordon-Taylor equation were selected to fit the experimental data of desorption isotherm and Tg, respectively. Penaeus vannamei meat was dehydrated at 35 and 1.5 m/s air velocity by using HPD. The quality attributes (such as hardness, toughness, shrinkage, total color difference and astaxanthin content) were analyzed at time interval of 1.0 h during HPD. The mechanism of quality degradation was explicated based on glass transition theory. The results showed that at the present drying conditions, Penaeus vannamei meat sample was in a rubbery state, characterized by a great mobility and remained this state until the end of drying process. The quality attributes were changed as drying continued, which can be related to the rubbery state of matrix during HPD. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Glass transition

Controlled terms: Adsorption isotherms? - ?Air? - ?Colorimetry? - ?Desorption? - ?Differential scanning calorimetry? - ?Drying? - ?Glass? - ?Heat pump systems? - ?Isotherms? - ?Meats ? - ?Moisture? - ?Pumps? - ?Temperature? - ?Thermal processing (foods)

Uncontrolled terms: Desorption isotherms? - ?Gordon-Taylor equation? - ?Heat pump drying? - ?Moisture desorption? - ?Penaeus vannamei? - ?Quality attributes? - ?Total color difference? - ?Transition theories

Classification code: 616.1 Heat Exchange Equipment and Components

Heat Exchange Equipment and Components

? - ?618.2 Pumps

Pumps

? - ?641.1 Thermodynamics

Thermodynamics

? - ?802.3 Chemical Operations

Chemical Operations

? - ?804 Chemical Products Generally

Chemical Products Generally

? - ?812.3 Glass

Glass

? - ?822.2 Food Processing Operations

Food Processing Operations

? - ?822.3 Food Products

Food Products

? - ?941.4 Optical Variables Measurements

Optical Variables Measurements

? - ?944.6 Temperature Measurements

Temperature Measurements

Numerical data indexing: Time 3.60e+03s, Velocity 1.50e+00m/s

DOI: 10.6041/j.issn.1000-1298.2017.01.039

Compendex references: YES

Database: Compendex

 

 

      

22. Effects of vermicompost co-applied with urea on root characteristics and humus in rhizosphere soil of cowpea

Accession number: 20171203478174

Authors: Jing, Dawei (1); Wang, Mingyou (1); Zhang, Hong (1); Li, Shiping (1)

Author affiliation: (1) College of Ecology and Garden Architecture, Dezhou University, Dezhou; 253023, China

Corresponding author: Wang, Mingyou(nwmy_sddz@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 212-219

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: A field experiment was conducted to explore the effect of vermicompost on the root absorption characteristics and humus composition of cowpea rhizosphere soil. The effects of different treatments, i.e., CK (neither urea nor vermicompost was applied), CF (100% of nitrogen was provided by urea), VC(100% of nitrogen was provided by vermicompost), and VC+CF (vermicompost and urea each provided 50% of nitrogen) on soil physical property, root activity, root morphological characteristics and root exudates, as well as humus composition in the rhizosphere soil of cowpea were studied. The results indicated that in comparison with CF treatment, the VC and VC+CF treatments evidently decreased soil bulk density, and significantly increased soil total porosity, capillary porosity and non-capillary porosity. Different fertilization treatments had no significant effect on root characteristics and humus composition in the rhizosphere soil at the seedling stage of cowpea. While at the stretch tendril period and flowering and pods formation stage, VC+CF treatment significantly increased root activity and obviously increased the total root length, specific root length, root surface area, root volume and root tip number, while the root average diameter was apparently decreased compared with CF treatment. The root surface area in the VC+CF treatment was increased by 144.88%, 80.73% and 36.82% at the flowering and pods formation stage compared with the treatments of CK, CF and VC, respectively. Meanwhile, VC+CF treatment also significantly increased the contents of root exudates and humic acid, and increased the ratio of humic acid to fulvic acid, showing 45.19%, 37.06% and 7.69% increases in humic acid content over the treatments of CK, CF and VC at the flowering and pods formation stage, respectively. Additionally, the VC+CF treatment could significantly increase yield and improve quality of cowpea, which had statistically significant differences with other treatments. Along with the extension of cowpea growth period, the impact of vermicompost co-applied with urea on root growth and soil physic-chemical properties of cowpea presented a gradually increasing trend. As a result, the application of vermicompost co-applied with urea was beneficial to root absorption characteristics and humus composition in the rhizosphere soil and soil nutrient-supply capacity improvement as well as growth with high-yield and high-quality of cowpea. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Soils

Controlled terms: Biological materials? - ?Metabolism? - ?Nitrogen? - ?Organic acids? - ?Plants (botany)? - ?Porosity? - ?Soil mechanics? - ?Urea

Uncontrolled terms: Cowpea? - ?Morphological characteristic? - ?Root characteristics? - ?Root exudates? - ?Soil physical property? - ?Specific root length? - ?Statistically significant difference? - ?Vermicomposts

Classification code: 461.2 Biological Materials and Tissue Engineering

Biological Materials and Tissue Engineering

? - ?483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?804 Chemical Products Generally

Chemical Products Generally

? - ?804.1 Organic Compounds

Organic Compounds

? - ?931.2 Physical Properties of Gases, Liquids and Solids

Physical Properties of Gases, Liquids and Solids

Numerical data indexing: Percentage 1.00e+02%, Percentage 1.45e+02%, Percentage 3.68e+01%, Percentage 3.71e+01%, Percentage 4.52e+01%, Percentage 5.00e+01%, Percentage 7.69e+00%, Percentage 8.07e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.028

Compendex references: YES

Database: Compendex

 

 

      

23. Spatial structure parameter analysis of rope cutting and releasing mechanism of D-knotter

Accession number: 20171203478156

Authors: Zhang, Anqi (1); Chen, Longjian (1); Dong, Hao (1); Zhang, Shaoying (1); Li, Haitao (1); Han, Lujia (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: Han, Lujia(hanlj@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 73-80

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aiming to resolve the problem the space structure of rope cutting and releasing mechanism of knotter was very complex and the structure parameter influencing the motion of rope cutting and releasing was unknown. Kinematics analysis of rope cutting and releasing mechanism and other mechanism were carried out. The parametric design theory about rope cutting and releasing mechanism was established. The relationship of parameter matching between rope cutting and releasing mechanism and other mechanism was described. The important structure parameters influencing the motion of rope cutting and releasing were analyzed. The design requirements of rope releasing platform and cutting knife were calculated. The results showed that the distance between center of gyration of rope cutting and releasing mechanism and the rope releasing platform were 27~35 mm, the distance between centre of gyration of rope cutting and releasing mechanism and the platform of rope cutting knife were 47~53 mm, the cutting edge size of rope cutting knife was decided by the position size of platform of rope cutting knife. In order to verify the accuracy of the model, a modular rope cutting and releasing mechanism was designed and manufactured based on the range of key size of rope cutting and releasing mechanism. The designed rope cutting and releasing mechanism can adjust the position size and structure size of rope releasing platform and cutting knife, it was very convenient for the validation of structural parameters of rope cutting and releasing mechanism. The wheat straw baling test on the designed mechanism was conducted in the interior, eleven experimental groups were designed. Results showed that if the design size met the design requirements, the effect of rope cutting and releasing was good, otherwise the effect of rope cutting and releasing was poor. Therefore, it can be found that the calculating structural size parameters of rope cutting and releasing mechanism were confirmed to the requirements of D-knotter, and the model was accurate and it could guide the optimal design of D-knotter. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Rope

Controlled terms: Structural design

Uncontrolled terms: Experimental groups? - ?Kinematics analysis? - ?Knotter? - ?Parameter matching? - ?Spatial structure? - ?Structural parameter? - ?Structural size parameters? - ?Structure parameter

Classification code: 408.1 Structural Design, General

Structural Design, General

Numerical data indexing: Size 2.70e-02m to 3.50e-02m, Size 4.70e-02m to 5.30e-02m

DOI: 10.6041/j.issn.1000-1298.2017.01.010

Compendex references: YES

Database: Compendex

 

 

      

24. Effect of long-term saline water irrigation on photosynthetic characteristics of winter wheat and soil salt content

Accession number: 20171203478170

Authors: Guo, Li (1); Zheng, Chunlian (1, 2); Cao, Caiyun (1, 2); Dang, Hongkai (1, 2); Li, Kejiang (1, 2); Ma, Junyong (1, 3)

Author affiliation: (1) Institute of Dry-land Farming, Hebei Academy of Agriculture and Forestry Sciences, Hengshui; 053000, China; (2) Key Laboratory of Crop Drought Resistance Research of Hebei Province, Hengshui; 053000, China; (3) Scientific Observing and Experimental Station of Arable Land Conservation South Hebei, Ministry of Agriculture, Hengshui; 053000, China

Corresponding author: Ma, Junyong(mjydfi@126.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 183-190

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to make full use of saline water resources, the impacts of different patterns (totally five treatments: CK, fresh water irrigation; T1, blended irrigation by mixing fresh water and saline water into 1.8 g/L salty water; T2, rotated irrigation of 3.6 g/L saline water with fresh water; T3, direct irrigation with 3.6 g/L salty water and T4, no irrigation) of salty water irrigation on photosynthetic characteristics and soil salt of winter wheat were studied in 2013-2015 based on a long-term saline water irrigation experiment. The results showed that treatments T3 and T4 significantly decreased plant height, leaf area index, leaf area duration, chlorophyll content, maximum photosynthetic rate (Pnmax), apparent quantum yield (φ), dark respiration rate (Rd) and grain yield compared with fresh water irrigation (CK). Continuous irrigation with 3.6 g/L salty water (T3) led to soil salt accumulation, thus it was not suitable for directly continuous irrigation of winter wheat. In comparison with CK, treatments T1 and T2 had no significant differences in plant height and photosynthetic characteristics, while there was an increasing tendency in soil salt content, the plant growth was not impacted. From the aspects of soil ecological environment and grain yield, the rotated irrigation pattern and the blended irrigation pattern of saline water utilization did not cause yield reduction and obvious soil secondary salinization, but it can save fresh water, therefore they were comparatively better ways for salty water utilization in winter wheat irrigation. The study provided an important reference for developing saline water irrigation of winter wheat. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Saline water

Controlled terms: Crops? - ?Grain (agricultural product)? - ?Irrigation? - ?Plants (botany)? - ?Soils? - ?Water? - ?Water resources

Uncontrolled terms: Chlorophyll contents? - ?Ecological environments? - ?Photosynthetic characteristics? - ?Saline water irrigations? - ?Salty water? - ?Soil salts? - ?Soil secondary salinizations? - ?Winter wheat

Classification code: 444 Water Resources

Water Resources

? - ?483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?821.4 Agricultural Products

Agricultural Products

Numerical data indexing: Mass_Density 1.80e+00kg/m3, Mass_Density 3.60e+00kg/m3

DOI: 10.6041/j.issn.1000-1298.2017.01.024

Compendex references: YES

Database: Compendex

 

 

      

25. Ammonia nitrogen and phosphorous removal from biogas slurry induced by biomass ash addition

Accession number: 20171203478177

Authors: He, Qingyao (1, 2); Ran, Yi (3); Liu, Lu (1, 2); Wang, Wenchao (1, 2); Yan, Shuiping (1, 2); Zhang, Yanlin (1, 2)

Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan; 430070, China; (3) Biogas Institute of Ministry of Agriculture, Chengdu; 610041, China

Corresponding author: Yan, Shuiping(yanshp@mail.hzau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 237-244 and 251

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to reduce the operation cost of ammonia nitrogen and phosphorus removal from biogas slurry (BS) through the “thermal-alkaline stripping” process, biomass ash (BA) addition was put forward to elevate the value of pH and precipitate the phosphorus in BS. Totally four types of BA were added into BS and pure water, including rice straw ash (RS), groundnut shell ash (GDS), cotton straw ash (CTS) and corn straw ash (CNS). Main water qualities of those solutions, including chemical oxygen demand (COD), concentration of suspended solid (SS), total phosphorus (TP) and total ammonia content (TAN), pH values, as well as calcium (Ca) and magnesium (Mg) contents were tested. The germination index (GI) values of Chinese cabbage seeds treated by these biogas slurries after CO2saturated were evaluated as well. Among those BAs, CTS had the highest solubility of about 12.97% and GDS had the lowest value of 10.67%. The results showed that when the BAs were added into the pure water, the pH value of water can reach 10.0~12.5. But when the same dosages of BAs were added into BS, the pH value of BS can only be elevated to 9.5~11.0 from 7.87 due to the good buffering characteristics of BS. The main reason of pH value improvement of BS might be the precipitation of CO2in BS by Ca2+or Mg2+leached from BA. This relatively high pH value could meet the requirement of “thermal-alkaline stripping” process for ammonia nitrogen removal, which may contribute to reducing the operation cost greatly. On the other hand, phosphorus removal efficiency was generally increased with the increase of BA dosage. The highest phosphorus removal efficiency of 78.74% was acquired when 100 g/L CTS was added into BS, but the efficiency was decreased inversely when BA dosage was increased to 200 g/L. The results also showed that when the BA dosage was increased to 200 g/L, the removal efficiency of COD and SS were above 50%. For the higher value of pH and phosphorus removal efficiency obtained by CTS addition, CTS was considered as the optimal type of BA. The germination index of Chinese cabbage seeds treated by CO2-rich BS solutions after BA addition was generally higher than 0.8, implying the low phytotoxicity. Therefore, the addition of BA into BS may be beneficial to ammonia nitrogen and phosphorus removal, and may not result in a rapid increase in phytotoxicity. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 31

Main heading: Nitrogen removal

Controlled terms: Alkalinity? - ?Ammonia? - ?Biogas? - ?Biomass? - ?Calcium? - ?Carbon dioxide? - ?Chemical oxygen demand? - ?Cost reduction? - ?Cultivation? - ?Efficiency ? - ?Magnesium? - ?Nitrogen? - ?Operating costs? - ?pH? - ?Phosphorus? - ?Seed? - ?Slurries? - ?Stripping (removal)? - ?Water quality

Uncontrolled terms: Ammonia nitrogen removal? - ?Biogas slurry? - ?Biomass ashes? - ?Phytotoxicity? - ?Total phosphorus

Classification code: 445.2 Water Analysis

Water Analysis

? - ?522 Gas Fuels

Gas Fuels

? - ?549.2 Alkaline Earth Metals

Alkaline Earth Metals

? - ?801.1 Chemistry, General

Chemistry, General

? - ?801.3 Colloid Chemistry

Colloid Chemistry

? - ?804 Chemical Products Generally

Chemical Products Generally

? - ?804.2 Inorganic Compounds

Inorganic Compounds

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?821.4 Agricultural Products

Agricultural Products

? - ?911.1 Cost Accounting

Cost Accounting

? - ?913.1 Production Engineering

Production Engineering

Numerical data indexing: Mass_Density 1.00e+02kg/m3, Mass_Density 2.00e+02kg/m3, Percentage 1.07e+01%, Percentage 1.30e+01%, Percentage 5.00e+01%, Percentage 7.87e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.031

Compendex references: YES

Database: Compendex

 

 

      

26. Characteristics of subsoiler traction and soil disturbance in paddy soil

Accession number: 20171203478153

Authors: Ding, Qishuo (1); Ge, Shuangyang (1); Ren, Jun (1); Li, Yinian (1); He, Ruiyin (1)

Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 47-56 and 63

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Optimization of tillage system for paddy soil requires a precise quantification of soil disturbance, soil structure and tillage energy efficiency. An in-situ tillage test plateform was applied for precise control on the working parameters of a subsoiler, which was a chisel design and was evaluated in five depths (i.e., 10 cm, 15 cm, 20 cm, 25 cm and 30 cm). Traction, specific resistance, disturbed soil profile and soil fragment distribution were measured to evaluate the performance of the subsoiler. Results showed an increased traction with respect to the engaging depth, which satisfied a second-order equation. In the 20 cm tilling depth the degree of soil disturbance, soil surface humping, soil cracking and longitudinal humping were found the maximum. The bumping height, width, disturbed area of soil profile, mean weight diameter were 16.3 cm, 42.2 cm, 0.030 5 m2and 28.77 cm, respectively. Specific resistance in this depth was the minimum, i.e. 62 kN/m2. When surpassing 20 cm depth, the bumping height, width, disturbed soil profile area, mean weight diameter were significantly decreased, which were 10.3 cm, 31.2 cm, 0.026 8 m2and 19.12 cm, respectively, for the 30 cm depth. Compared with the 20 cm depth, these parameters were decreased by 36.8%, 26.1%, 12.1% and 33.54%, respectively. Meanwhile, the specific resistance was 195 kN/m2for the 30 cm depth which was increased by 214.5% compared with 20 cm depth. In considerating the overall effect of tillage-induced soil struction, soil tilth quality and energy use efficiency, tilling the paddy soil into 20 cm provided the best results. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 52

Main heading: Soils

Controlled terms: Agricultural machinery? - ?Agriculture? - ?Energy efficiency

Uncontrolled terms: Energy-use efficiency? - ?Mean weight diameter? - ?Paddy soils? - ?Second-order equation? - ?Soil disturbances? - ?Specific resistances? - ?Subsoiler? - ?Working parameters

Classification code: 483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?525.2 Energy Conservation

Energy Conservation

? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control

Agricultural Equipment and Methods; Vegetation and Pest Control

? - ?821.1 Agricultural Machinery and Equipment

Agricultural Machinery and Equipment

Numerical data indexing: Percentage 1.21e+01%, Percentage 2.14e+02%, Percentage 2.61e+01%, Percentage 3.35e+01%, Percentage 3.68e+01%, Size 1.00e-01m, Size 1.03e-01m, Size 1.50e-01m, Size 1.63e-01m, Size 1.91e-01m, Size 2.00e-01m, Size 2.50e-01m, Size 2.88e-01m, Size 3.00e-01m, Size 3.12e-01m, Size 4.22e-01m

DOI: 10.6041/j.issn.1000-1298.2017.01.007

Compendex references: YES

Database: Compendex

 

 

      

27. Structural synthesis of uncoupled spatial translational parallel mechanisms

Accession number: 20171203478189

Authors: Zhang, Yanbin (1); Zhao, Yifu (1); Li, Yuesong (1); Wang, Zenghui (1); Ding, Ding (1)

Author affiliation: (1) School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang; 471003, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 325-332 and 316

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to solve the strong kinematics coupling problem of parallel mechanisms obtained by the normal type synthesis approach, a systematic method for structural synthesis of the uncoupled spatial translational parallel mechanisms (USTPM) was presented based on the actuation wrench screw theory. Firstly, mathematic model mapping the relationship between the inputs and the outputs of USTPM was set up. Secondly, both the actuation wrench screw and actuated twist screw’s forms of the kinematical chains were obtained according to the condition that the velocity Jacobian matrix was a diagonal one. Then the rules to determine the non-actuated screws of the limbs were established in terms of the reciprocal product principle. Both criterion and steps of the limb’s type synthesis were proposed as well. Finally, the mechanisms with the expected motion characteristics were designed by selection three limbs synthesized above to connect the platform and the base. Totally 60 symmetrical USTPMs were designed. Among them, 47 mechanisms were non-overconstrained and 29 mechanisms were composed of the open single kinematic chains with idle joints. The Jacobian was a diagonal matrix of the synthesized parallel mechanisms. It was more interesting that some mechanisms’ Jacobian was the identical matrix, in which there existed one-to-one linear mapping relationship between the input velocities of the actuated joints and the output velocities of the moving platform for these mechanisms, and condition number of their Jacobians was equal to 1. So these mechanisms showed fully-isotropic throughout their whole workspace. Meanwhile, they performed very well with regard to motion and force transmission. This work contributed to enriching and improving the structural synthesis theory of the parallel mechanisms. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Jacobian matrices

Controlled terms: Chains? - ?Joints (anatomy)? - ?Kinematics? - ?Matrix algebra? - ?Mechanisms? - ?Number theory? - ?Screws? - ?Tools

Uncontrolled terms: Force transmission? - ?Motion characteristics? - ?Non-overconstrained? - ?Parallel mechanisms? - ?Screw theory? - ?Structural synthesis? - ?Translational parallel mechanisms? - ?Uncoupled

Classification code: 461.3 Biomechanics, Bionics and Biomimetics

Biomechanics, Bionics and Biomimetics

? - ?601.3 Mechanisms

Mechanisms

? - ?602.1 Mechanical Drives

Mechanical Drives

? - ?605 Small Tools and Hardware

Small Tools and Hardware

? - ?921.1 Algebra

Algebra

? - ?931.1 Mechanics

Mechanics

DOI: 10.6041/j.issn.1000-1298.2017.01.043

Compendex references: YES

Database: Compendex

 

 

      

28. Electric vehicles stability control based on electromagnetic-mechanical coupled regenerative braking system

Accession number: 20171203478187

Authors: Zhang, Lu (1, 2); Zhang, Zhongfu (3); Wang, Guoye (1); Zhao, Jianzhu (1); Zhang, Yanli (4); Wang, Changwei (4)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Transportation Institute, Inner Mongolia University, Huhhot; 010070, China; (3) School of Transportation Science and Engineering, Beihang University, Beijing; 100191, China; (4) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 309-316

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: For the deficiency of current electric vehicle regenerative braking, a new-type electromagnetic-mechanical coupled regenerative braking system was proposed. The new-type electromagnetic-mechanical coupled regenerative braking system overcame independent control of friction braking and regenerative braking. Based on the system, two degrees of freedom vehicle dynamic model with the lateral force limitation was taken as reference model. Meanwhile, electric vehicle stability control strategy was proposed based on direct braking input distribution and fuzzy-compensation control. According to the test conditions and evaluation indicators of American regulation FMVSS126, the lateral stability, handling response and braking energy recovery efficiency were analyzed and contrasted with or without ESC control by vehicle dynamic co-simulation platform of Matlab/Simulink and CarSim. The results showed that the vehicle equipped with ESC passed the sine with dwell tests of regulation successfully. The proposed fuzzy-compensation stability control algorithm had better robustness and yaw stability, which reduced the tracking error of vehicle slip angle and yaw rate effectively. The electric vehicle stability control strategy integrated regenerative braking not only can increase the driving safety of electric vehicles, but also had the recovery efficiency. The research results of the new-type electromagnetic-mechanical coupled regenerative braking system were focused on the vehicle stability, and involved with some braking energy recovery. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Regenerative braking

Controlled terms: Braking? - ?Degrees of freedom (mechanics)? - ?Dynamics? - ?Electric automobiles? - ?Electric machine control? - ?Electric vehicles? - ?Error compensation? - ?MATLAB? - ?Recovery? - ?Specific variables control ? - ?Stability? - ?System stability? - ?Vehicles

Uncontrolled terms: Braking energy recoveries? - ?Fuzzy compensation? - ?Regenerative braking systems? - ?Stability control? - ?Stability control algorithm? - ?Two degrees of freedom? - ?Vehicle dynamic model? - ?Vehicle stability control

Classification code: 602 Mechanical Drives and Transmissions

Mechanical Drives and Transmissions

? - ?662.1 Automobiles

Automobiles

? - ?731.2 Control System Applications

Control System Applications

? - ?731.3 Specific Variables Control

Specific Variables Control

? - ?921 Mathematics

Mathematics

? - ?931.1 Mechanics

Mechanics

? - ?961 Systems Science

Systems Science

DOI: 10.6041/j.issn.1000-1298.2017.01.041

Compendex references: YES

Database: Compendex

 

 

      

29. Characteristics of water and salt movement in soil under moistube-irrigation with brackish water

Accession number: 20171203478169

Authors: Zhang, Kemeng (1); Niu, Wenquan (1, 2); Wang, Youke (1, 2); Xue, Wanlai (2, 3); Zhang, Zizhuo (1)

Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Soil and Water Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) Beijing Water Science and Technology Institute, Beijing; 100048, China

Corresponding author: Wang, Youke(gjzwyk@vip.sina.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 175-182

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to explore the movement characteristics of water and salt in soil under moistube-irrgation with brackish water, an indoor soil box simulation experiment was conducted under five different mineralization degree treatments with distilled water as control in 72 h. The results showed that with the rise of mineralization degree, the maximum migration distance presented a trend of first increase and then decrease in different directions and reached the highest when the degree of mineralization was 3.0 g/L. And the distances of wetted front under treatments of brackish water were all greater than that of distilled water. Then the cumulative infiltration was substituted into the Kostiakov infiltration equation and the infiltration coefficient showed a trend of rise first and then fall with the increase of mineralization degree, while infiltration index continued to decline. The soil conductivity was increased constantly to all around with the moistube-irrgation zone as axis and reached the peak at the wet front. The desalting area was related to the shape of the wetted body and distributed in circular shape. There was no significant difference in the average salt content of soil profile between brackish and distilled water after infiltration. The desalination radius was decreased linearly with the increase of mineralization degree. Both surface and bottom convergence phenomenon existed and the salification in soil surface was more serious under moistube-irrgation. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 36

Main heading: Infiltration

Controlled terms: Desalination? - ?Irrigation? - ?Mineralogy? - ?Soil structure interactions? - ?Soils? - ?Wetting

Uncontrolled terms: Cumulative infiltrations? - ?Distilled water? - ?Infiltration coefficients? - ?Migration distance? - ?Mineralization degree? - ?Movement characteristics? - ?Soil conductivity? - ?Water and salts

Classification code: 445.1 Water Treatment Techniques

Water Treatment Techniques

? - ?482 Mineralogy

Mineralogy

? - ?483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?483.2 Foundations

Foundations

? - ?821.3 Agricultural Methods

Agricultural Methods

Numerical data indexing: Mass_Density 3.00e+00kg/m3, Time 2.59e+05s

DOI: 10.6041/j.issn.1000-1298.2017.01.023

Compendex references: YES

Database: Compendex

 

 

      

30. Risk and inducing mechanism of acceleration emitter clogging with fertigation through drip irrigation systems

Accession number: 20171203478176

Authors: Liu, Lu (1); Niu, Wenquan (1, 2); Wu, Zhiguang (2); Guan, Yahui (3); Li, Yuan (1)

Author affiliation: (1) Institute of Soil and Water Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling; Shaanxi; 712100, China

Corresponding author: Niu, Wenquan(nwq@nwafu.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 228-236

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The inducing mechanism of emitters clogging with fertigation was explored. A laboratory experiment was conducted to investigate the influence of three factors (fertilizer types, fertilizer concentration and flow path structure) on anti-clogging performance of drip emitters. The intermittent drip irrigation experiment was studied by using two flow path types of non-pressure compensating emitters (arc-shaped saw-tooth and cup-shaped saw-tooth), four levels of fertilization concentration (0.5%, 1.0%, 2.0% and 3.0%) and four types of fertilizer (urea, calcium superphosphate, potassium sulfate and water soluble compound fertilizer) and the system was allowed to run for 20 h. The mathematical analysis methods in combination with field scanning electron microscope (FESM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) technology were then used to quantitatively and qualitatively analyze the variations of the emitter’s average relative flow rate, surface topographical characteristics and components of the clogging materials internal emitters. Results showed that fertilizer characteristic was an important factor in deciding the emitter clogging type and degree (P<0.01), and the influence of the two flow path structures on the accelerating effect of emitter clogging performance needed to consider the path structural size and style. The accelerating effect of fertilizer application on emitter was not obvious when the concentration of fertilizer solution was less than 0.5%. When the concentration was increased to 0.5%~2.0%, there were obvious changes in the quantities of outflow discharge occurred in phosphate-fertigation, which made it clog easily, followed with urea-fertigation, the applicability of potassium-fertigation and compound-fertigation was better than that of the former. When the concentration was risen to 2.0%~3.0% or higher, the clogging degree was so serious with urea-fertigation, the flow rate was decreased by 10.26%, which was significantly higher than those of phosphate-fertigation (7.85%), potassium-fertigation (4.07%) and compound-fertigation (2.74%). Fertilization can promote the clogging of the emitters. These fertilizer types had different water quality, hence resulting into different emitter clogging risk and inducing mechanism. Emitters clogging with urea fertigation were caused by the role of aggregation and adhesion with both crystallization of the molecular urea state and suspended particles in the water. The adsorption function that particulate impurities to phosphorus promoted flocculation while precipitation among solid particles was as a result of inducing mechanism of emitter clogging with phosphate fertigation. The main inducing mechanism for emitter clogging with potassium-fertigation was chemical precipitation because of the ion-exchange action, while emitter clogging with compound-fertigation had the lowest risk. Therefore, fertigation with different fertilizer types should adopt different emitter clogging controlling management strategy. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Fertilizers

Controlled terms: Ion exchange? - ?Irrigation? - ?Mechanisms? - ?Metabolism? - ?Precipitation (chemical)? - ?Risks? - ?Scanning electron microscopy? - ?Spectrometers? - ?Urea? - ?Water quality ? - ?X ray diffraction

Uncontrolled terms: Clogging? - ?Drip irrigation systems? - ?Emitter? - ?Energy dispersive spectrometers? - ?Fertigations? - ?Fertilizer applications? - ?Non-pressure compensating? - ?Water soluble compounds

Classification code: 445.2 Water Analysis

Water Analysis

? - ?601.3 Mechanisms

Mechanisms

? - ?741.3 Optical Devices and Systems

Optical Devices and Systems

? - ?802.2 Chemical Reactions

Chemical Reactions

? - ?802.3 Chemical Operations

Chemical Operations

? - ?804 Chemical Products Generally

Chemical Products Generally

? - ?804.1 Organic Compounds

Organic Compounds

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?914.1 Accidents and Accident Prevention

Accidents and Accident Prevention

Numerical data indexing: Percentage 1.00e+00%, Percentage 1.03e+01%, Percentage 2.00e+00%, Percentage 2.74e+00%, Percentage 3.00e+00%, Percentage 4.07e+00%, Percentage 5.00e-01%, Percentage 7.85e+00%, Time 7.20e+04s

DOI: 10.6041/j.issn.1000-1298.2017.01.030

Compendex references: YES

Database: Compendex

 

 

      

31. Optimization design and experiment of large cube-type pump device

Accession number: 20171203478159

Authors: Shi, Lijian (1); Tang, Fangping (1); Liu, Xueqin (2); Xie, Rongsheng (1); Song, Xijie (1); Zhang, Wenpeng (1)

Author affiliation: (1) School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou; 225100, China; (2) Jiangsu Surveying and Design Institute of Water Resources Co., Ltd., Yangzhou; 225100, China

Corresponding author: Tang, Fangping(tangfp@yzu.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 96-103

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to better understand the hydraulic performance of cube-type pump system with inlet and outlet conduits, based on CFD numerical simulation and DOE orthogonal experimental design method of a model test, a three dimensional parametric model of the inlet and outlet conduits was constructed with the velocity uniformity of outlet-section for inlet passage and the hydraulic loss as objective function. The five factors and four levels orthogonal test was designed in view of the inlet flare tube, the water-guide cone, the outlet flare tube and the control size of outlet-guide piers. Aiming at the design flow point, totally 16 numerical simulation schemes of the inlet passage and outlet passage were calculated respectively by means of CFD numerical simulation to analyze the effect of different control sizes on the performance of inlet and outlet conduits. The reliability of optimization numerical results was validated through the model test finally. As shown in the numerical simulation and experimental results, the inlet conduit optimization design by means of DOE orthogonal design method, the influence of control parameters on hydraulic loss of an inlet passage and the primary and secondary effects on the uniformity of export section can be got. The largest hydraulic loss was 8.56 cm, the smallest hydraulic loss was 3.91 cm, the optimized hydraulic loss was 3.65 cm, and the uniformity of outlet velocity was 93.07%, the optimization design made the hydraulic loss reduced by 1.31 cm and the uniformity of outlet velocity increased by 1.17 percentage points compared with the initial plan. The largest hydraulic loss of outlet conduit was 46.07 cm, the hydraulic loss of outlet conduit for the optimal combination scheme was 32.53 cm, which was reduced by 7.96 cm compared with the original plan. According to the whole characteristic curve of the pump system, it can be learned that the pump hydraulic loss of outlet conduit was minimum under the design condition, the highest efficiency was 70.04%, the highest running head was 4.0 m under the design condition with head of 1.36 m, the efficiency was 66.82%, and the corresponding flow rate was 34.31 m3/s. The highest efficiency of the model test can be up to 71.5% under the design condition with head of 1.36 m, the test efficiency was around 64%, which was in good agreement with the numerical simulation results. It illustrated that the better scheme can be designed by using the orthogonal design method, this study also provided reference for the similar optimization design of pump station. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: Design

Controlled terms: Computational fluid dynamics? - ?Design of experiments? - ?Efficiency? - ?Experiments? - ?Geometry? - ?Numerical methods? - ?Numerical models? - ?Orthogonal functions? - ?Pumps? - ?Testing

Uncontrolled terms: CFD numerical simulations? - ?Characteristic curve? - ?Cube-type pump device? - ?Hydraulic performance? - ?Numerical calculation? - ?Optimization design? - ?Orthogonal design method? - ?Orthogonal experimental design method

Classification code: 618.2 Pumps

Pumps

? - ?723.5 Computer Applications

Computer Applications

? - ?901.3 Engineering Research

Engineering Research

? - ?913.1 Production Engineering

Production Engineering

? - ?921 Mathematics

Mathematics

? - ?921.6 Numerical Methods

Numerical Methods

Numerical data indexing: Percentage 6.40e+01%, Percentage 6.68e+01%, Percentage 7.00e+01%, Percentage 7.15e+01%, Percentage 9.31e+01%, Size 1.31e-02m, Size 1.36e+00m, Size 3.25e-01m, Size 3.65e-02m, Size 3.91e-02m, Size 4.00e+00m, Size 4.61e-01m, Size 7.96e-02m, Size 8.56e-02m

DOI: 10.6041/j.issn.1000-1298.2017.01.013

Compendex references: YES

Database: Compendex

 

 

      

32. Kinetic study on anaerobic reaction of livestock wastewater

Accession number: 20171203478178

Authors: Gai, Xikun (1, 2); Zhang, Liangquan (1, 2)

Author affiliation: (1) School of Biological and Chemical Engineering, Zhejiang University of Science & Technology, Hangzhou; 310023, China; (2) Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Hangzhou; 310023, China

Corresponding author: Zhang, Liangquan(zhlq816@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 245-251

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: With the rapid development of economy and improvement of people’s living standard, aquaculture was developed rapidly over the past years. And a large amount of livestock wastewater was produced meanwhile. Thus effective treatment of livestock wastewater becomes the much urgent problem to be solved. Anaerobic treatment technology is recognized as one of the most promising wastewater treatment technologies in environmentally sustainable development. The design of anaerobic reactor is the key for developing anaerobic treatment technology of livestock wastewater. In order to describe and simulate the process of anaerobic reaction, guide the optimization of process parameters and design of reactor in the practical production, the kinetic model of livestock wastewater was established. The experiments were carried out in an external loop reactor. The orthogonal experiments with three factors and three levels were designed by taking temperature, matrix COD and pH value as factors. Temperature parameters were introduced to improve the Monod equation, and the dynamic models of matrix consumption and product formation were established. By linear and nonlinear regression, the model parameters and the corresponding dynamic equations were established, and the effects of reaction temperature and substrate concentration on reaction rate were revealed. The results showed that the reaction activation energy was very low, and the effect of temperature on reaction rate could be neglected. Temperature could affect the production rate of CH4and CO2. The production of CO2would be increased with the increase of temperature. The new livestock wastewater anaerobic reaction dynamics model could fit the experimental data well, which had positive significance for the development and design of new anaerobic reactor. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 14

Main heading: Agriculture

Controlled terms: Activation energy? - ?Carbon dioxide? - ?Kinetic parameters? - ?Kinetic theory? - ?Kinetics? - ?Matrix algebra? - ?Nonlinear equations? - ?Reaction rates? - ?Wastewater treatment

Uncontrolled terms: Anaerobic reactions? - ?Anaerobic reactor? - ?Environmentally sustainable development? - ?Kinetic modeling? - ?Livestock wastewater? - ?Optimization of process parameters? - ?Substrate concentrations? - ?Wastewater treatment technologies

Classification code: 452.4 Industrial Wastes Treatment and Disposal

Industrial Wastes Treatment and Disposal

? - ?802.2 Chemical Reactions

Chemical Reactions

? - ?804.2 Inorganic Compounds

Inorganic Compounds

? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control

Agricultural Equipment and Methods; Vegetation and Pest Control

? - ?921.1 Algebra

Algebra

? - ?931 Classical Physics; Quantum Theory; Relativity

Classical Physics; Quantum Theory; Relativity

DOI: 10.6041/j.issn.1000-1298.2017.01.032

Compendex references: YES

Database: Compendex

 

 

      

33. Design and experiment of grafting robot operated by one person for cucurbitaceous seedlings cultivated in plug trays

Accession number: 20171203478148

Authors: Chu, Jia (1); Zhang, Libo (1); Zhang, Tiezhong (1, 2); Zhang, Wenbo (1); Wang, Liangju (1); Liu, Zhan (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Ministry of Agriculture for Soil-Machine-Plant System Technology, Beijing; 100083, China

Corresponding author: Zhang, Tiezhong(zhangtz56@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 7-13

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: For the purpose of decreasing the investment of labour force in the process of vegetable grafting, a vegetable grafting robot operated by one person for Cucurbitaceous seedlings cultivated in plug trays was designed. The machine utilized the root-cutting grafting method. During working, the operator delivered respectively the stock and scion seedlings from plug trays on the left-hand and right-hand sides to seedling-providing platforms. The seedlings triggered the touching switches and then the machine completed automatically the subsequent motions of gripping, cutting, jointing, fixation and discharge controlled by PLC program. A theoretical analysis of promotion of grafting efficiency was done. In theory, the operating efficiency for one person of this robot can be promoted by 100%, compared with the old type of 2JSZ-600II grafting robot. And the analysis suggested that with the operating qualification promoting, the efficiency would be higer. Experiment results showed that the grafting success rate of the machine could reach up 95% and its grafting speed was approximately 455 seedlings per hour. Compared with previous grafting robots whose grafting efficiency was merely 600 seedlings per hour operated by two people, the machine’s working efficiency of per capita was improved by more than 50%. Therefore, the upgraded machine operated by one person was quite capable of developing the grafting labour efficiency. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 14

Main heading: Grafting (chemical)

Controlled terms: Design? - ?Efficiency? - ?Experiments? - ?Machine design? - ?Robots? - ?Seed? - ?Vegetables

Uncontrolled terms: Cucurbitaceous seedlings? - ?Grafting efficiency? - ?Grafting method? - ?Grafting robots? - ?Operating efficiency? - ?Plug trays? - ?Right-hand sides? - ?Working efficiency

Classification code: 601 Mechanical Design

Mechanical Design

? - ?731.5 Robotics

Robotics

? - ?802.2 Chemical Reactions

Chemical Reactions

? - ?821.4 Agricultural Products

Agricultural Products

? - ?901.3 Engineering Research

Engineering Research

? - ?913.1 Production Engineering

Production Engineering

Numerical data indexing: Percentage 1.00e+02%, Percentage 5.00e+01%, Percentage 9.50e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.002

Compendex references: YES

Database: Compendex

 

 

      

34. Influence of DEM super-resolution reconstruction on terraced field slope extraction

Accession number: 20171203478161

Authors: Zhang, Hongming (1); Song, Zelu (1); Yang, Jiangtao (2); Yang, Qinke (3); Wang, Chunmei (3); Li, Rui (4)

Author affiliation: (1) College of Information Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) College of Water Resource and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) College of Urban and Environmental Science, Northwest University, Xi’an; 710069, China; (4) Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling; Shaanxi; 712100, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 112-118 and 138

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Slope is one of the key factors which had a close relationship with soil and water losses and land use planning, and it is one of the most important pieces of information in many natural source spatial databases. Slope was usually extracted from digital elevation model (DEM) in regional scale. However, it is difficult to obtain DEMs with grid size less than 10-m from continental or country scale topographic maps that are needed to include topographic changes due to terraces because of manpower and financial restrictions. Thus the high resolution DEMs were usually obtained by super-resolution reconstruction or down scaling from low resolution DEMs. As a basic data source, high resolution DEMs created by super-resolution methods do influence the extraction of slope. Dry terraced fields in the hilly loess region around Longquan of Yuzhong County were taken as study area. DEMs and orthophotos obtained in March, 2015 by UAV-based photogrammetry were used. The resolution of the DEMs data was generated in 5 m, 10 m, 20 m and 40 m respectively for slope produce. Sparse mixed estimation method (SME), nearest method, bilinear method and cubic method were used for DEMs reconstruction. Finally, the slope was calculated from original DEMs and reconstructed DEMs. The result showed that the SME method was the best method in DEMs super resolution reconstruction for extraction of slope. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Surveying

Controlled terms: Erosion? - ?Extraction? - ?Land use? - ?Maps? - ?Optical resolving power

Uncontrolled terms: Digital elevation model? - ?Estimation methods? - ?Slope? - ?Soil and water loss? - ?Super resolution reconstruction? - ?Superresolution methods? - ?Terrace? - ?Topographic changes

Classification code: 403 Urban and Regional Planning and Development

Urban and Regional Planning and Development

? - ?405.3 Surveying

Surveying

? - ?741.1 Light/Optics

Light/Optics

? - ?802.3 Chemical Operations

Chemical Operations

Numerical data indexing: Size 1.00e+01m, Size 2.00e+01m, Size 4.00e+01m, Size 5.00e+00m

DOI: 10.6041/j.issn.1000-1298.2017.01.015

Compendex references: YES

Database: Compendex

 

 

      

35. Object-oriented wetland classification based on hybrid feature selection method combining with relief f, multi-objective genetic algorithm and random forest

Accession number: 20171203478162

Authors: Liu, Shu (1); Jiang, Qigang (1); Ma, Yue (1); Xiao, Yan (1); Li, Yuanhua (1); Cui, Can (2)

Author affiliation: (1) College of Geo-exploration Science and Technology, Jilin University, Changchun; 130026, China; (2) Navigation College, Dalian Maritime University, Dalian; 116000, China

Corresponding author: Jiang, Qigang(jiangqigang@jlu.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 119-127

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Recently, researchers adopted object-oriented method to extract wetland distributions. Multi-temporal and multi-sources of data can facilitate the extraction process but meanwhile it enlarges the amount of features. It needs a large quantity of experiment based on the expert knowledge to determine the optimal feature sets and the threshold values. In order to improve the classification accuracy and relief the researchers from large amount of work, a filter-wrapper hybrid feature selection method combining relief F, multi-objective genetic algorithm and random forest was proposed, which was a two-step method. In the first step, relief F algorithm was adopted to select features with class separability. In the second step, multi-objective genetic algorithm based on random forest (MOGARF) was built. Four measures such as out-of-bag (OOB) error of random forest algorithm, dimension of the feature space, correlations among features and the variable weight of relief F algorithm were acted as four objectives of MOGA. The probability whether the feature was expressed was determined by the variable importance measures from random forest algorithm. The crowded distance of each feature collection was calculated and the feature collection with the least crowded distance was the optimal feature set. Nanweng river basin was taken as the study site. Object-oriented classification using random forest classifier was conducted based on the optimal feature set. Then the result was compared with three other random forest classification schemes by using the entire feature set or the feature set selected by relief F algorithm or the Boruta algorithm. The classification scheme with MOGARF had the best performance and the feature dimension was reduced to 10% of the entire one. The overall accuracy reached 92.61% which was 0.35%~1.94% higher than those of the other three schemes with Kappa coefficient of 0.930 6. The OOB error of MOGARF was 7.77% which was 0.91%~1.48% lower than those of the other schemes. All these indicated that the MOGARF feature selection method was an effective feature selection method when it was combined with random forest classifier. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 28

Main heading: Classification (of information)

Controlled terms: Data mining? - ?Decision trees? - ?Feature extraction? - ?Genetic algorithms? - ?Remote sensing? - ?Wetlands

Uncontrolled terms: Hybrid feature selections? - ?Multi-objective genetic algorithm? - ?Object oriented? - ?Object oriented classification? - ?Random forest algorithm? - ?Random forest classification? - ?Remote sensed imagery? - ?Wetland classification

Classification code: 716.1 Information Theory and Signal Processing

Information Theory and Signal Processing

? - ?723.2 Data Processing and Image Processing

Data Processing and Image Processing

? - ?961 Systems Science

Systems Science

Numerical data indexing: Percentage 1.00e+01%, Percentage 7.77e+00%, Percentage 9.26e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.016

Compendex references: YES

Database: Compendex

 

 

      

36. Automatic recognition method of laying hen behaviors based on depth image processing

Accession number: 20171203478166

Authors: Lao, Fengdan (1); Du, Xiaodong (2); Teng, Guanghui (2)

Author affiliation: (1) Network Center, China Agricultural University, Beijing; 100083, China; (2) College of Water Resources and Civil Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: Teng, Guanghui(futong@cau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 155-162

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Animal behaviors are reflective of its welfare state. They contain important information that can enable producers to better manage livestock. Yet it is more difficult in recognizing the behaviors of group laying hens than other big size animals. Large numbers of hens, homogeneous in appearance, high stocking density and variable body size all contribute to this situation. A computer vision-based system was developed which can automatically recognize group behaviors (distribution index, horizontal activity index and vertical activity index) and individual behaviors (feeding, lying, standing and sitting) of group hens. The system consisted of a 3D camera that simultaneously acquired digital and depth images and a software program that detected and identified the behaviors. The computational algorithm for the analysis of depth images was presented and its performance in recognizing the behaviors as compared with manual recognition was analyzed. The images were acquired at 5 s intervals in 10 d period. The algorithm had the following accuracy of individual behavioral classification: 90.3% in feeding, 91.5% in lying, 87.5% in standing and 56.2% in sitting. The lower classification accuracy for the sitting presumably stemmed to imprecise segmentation valve value between sitting and standing and sometimes mistook hen’s standing behavior (exploring in ground) for sitting which could be improved in later test. Hence the reported system provided an effective way to automatically process and classify hen’s group and individual behaviors. This tool was conducive to investigate behavioral responses and time budget of laying hens and facility design and management practice. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 14

Main heading: Behavioral research

Controlled terms: Agriculture? - ?Animals? - ?Budget control? - ?Cameras? - ?Image acquisition? - ?Image processing

Uncontrolled terms: Automatic recognition? - ?Automatic recognition method? - ?Behaviors? - ?Classification accuracy? - ?Computational algorithm? - ?Depth image? - ?Depth image processing? - ?Laying hens

Classification code: 723 Computer Software, Data Handling and Applications

Computer Software, Data Handling and Applications

? - ?742.2 Photographic Equipment

Photographic Equipment

? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control

Agricultural Equipment and Methods; Vegetation and Pest Control

? - ?971 Social Sciences

Social Sciences

Numerical data indexing: Percentage 5.62e+01%, Percentage 8.75e+01%, Percentage 9.03e+01%, Percentage 9.15e+01%, Time 5.00e+00s

DOI: 10.6041/j.issn.1000-1298.2017.01.020

Compendex references: YES

Database: Compendex

 

 

      

37. Excursion characteristic learning and recognition for hand image knuckles based on log gaussian cox field

Accession number: 20171203478193

Authors: Yang, Shiqiang (1); Gong, Luqi (1)

Author affiliation: (1) Faculty of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an; 710048, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 353-360

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The effective description method for hand gesture is the most important in intelligent coordination assembly process based on human computer interaction. And effective hand finger knuckle detection is beneficial to the description of hand gesture.The structure characteristics of hand knuckles image are fuzzy and it is difficult to feature modeling. The extraction and learning method of excursion characteristic for hand knuckles image was presented and the hand knuckle was recognized by hand image based on Log Gaussian Cox random image model theory. The approximations of image excursion representation were given combined with level set decomposition of random image when the priori hypothesis was absented in Cox process image model. On the basis of nonparametric kernel estimation of image gray distribution, excursion characteristic was enhanced by nonlinear anisotropic filtering. And the Bayesian form of excursion measurement was established. The model learning and feature fusion algorithm on excursion characteristics with different excursion parameters was presented. And the features fusion representation of hand knuckle image was acquired. The hand knuckles image recognition results with many different hierarchical excursion data models were compared. The knuckle detection algorithm on hand image was presented. The ROC curves statisical law of hand knuckles detection with defferent models showed that the classification ablility of this method was correct and stable.The results also showed that the knuckle recognition ability of the model had some difference for different knuckle categories, and there were some differences in the deep distribution of image data between far knuckles and mid-knuckles. And the method was feasible. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Palmprint recognition

Controlled terms: Gaussian distribution? - ?Human computer interaction? - ?Image processing? - ?Image recognition

Uncontrolled terms: Anisotropic filtering? - ?Coordination assembly? - ?Excursion characteristic leaning? - ?Excursion measurements? - ?Hand knuckles recognition? - ?Random fields? - ?Recognition abilities? - ?Structure characteristic

Classification code: 723.5 Computer Applications

Computer Applications

? - ?922.1 Probability Theory

Probability Theory

DOI: 10.6041/j.issn.1000-1298.2017.01.047

Compendex references: YES

Database: Compendex

 

 

      

38. Quantitative evaluation of effect of soil types on preferential flow pathways and soil phosphorus forms

Accession number: 20171203478175

Authors: Liang, Jianhong (1); Wu, Yanhong (1); Zhou, Jun (1); Wang, Jipeng (1); Wang, Xiaoxiao (1); Li, Rui (1)

Author affiliation: (1) Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu; 610041, China

Corresponding author: Wu, Yanhong(yhwu@imde.ac.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 220-227

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: With the development of earth’s critical zone, the crucial hydropedological problems are needed to be solved. The quantitative expression of preferential flow and soil structure and stratification, water flow in situ and solute transport is the key research to the earth’s critical zone. Phosphorus loss from soils and water flow has been a vital water quality issue because of the critical role that phosphorus plays in eutrophication. Preferential flow pathways (PFPs) are one of main factors that affect subsurface phosphorus transport, which are the direct connections between soil surface and groundwater. The phosphorus fractions of two types of soil, Regosols from Gongga Mountain and Stagnosol from Ore Mountain, were investigated by using the modified Hedley sequential phosphorus extraction method. Regosols in Gongga Mountain was developed by the moraine colonization by plants in the relatively mild and humid climate. PFPs were identified by the dye tracer experiments using brilliant blue FCF. The tracer-infiltration patterns were parameterized by dye coverage ratio (Dc) and evaluation index of PFPs (Cv). The impact of PFPs on the distribution of phosphorus fractions was evaluated by the Pearson correlations and T-test. The results indicated that dye coverages of Regosols from Gongga Mountain and Stagnosol from Ore Mountain were 31% and 52%, respectively. The degree of preferential flow in Ore Mountain Stagnosol soil was tended to be larger than that in Regosols soil from Gongga Mountain; PFPs in Gongga Mountain were important contributors to the potential bioavailable inorganic phosphorus (PBPi) and organic phosphorus load, while PFPs in Ore Mountain were important contributors to the readily bioavailable inorganic phosphorus (RBPi). In conclusion, the results showed that soil types could affect both the infiltration patterns of PFPs and the transfer process of phosphorus fractions. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Infiltration

Controlled terms: Eutrophication? - ?Extraction? - ?Flow of water? - ?Groundwater? - ?Groundwater flow? - ?Hydraulics? - ?Landforms? - ?Ore treatment? - ?Ores? - ?Phosphorus ? - ?Soil testing? - ?Soils? - ?Solute transport? - ?Water quality

Uncontrolled terms: Dye tracer? - ?Inorganic phosphorus? - ?Phosphorus fractions? - ?Phosphorus transport? - ?Preferential flows? - ?Quantitative evaluation? - ?Sequential extraction method? - ?Water quality issues

Classification code: 444.2 Groundwater

Groundwater

? - ?445.2 Water Analysis

Water Analysis

? - ?481.1 Geology

Geology

? - ?483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?533.1 Ore Treatment

Ore Treatment

? - ?631.1.1 Liquid Dynamics

Liquid Dynamics

? - ?632.1 Hydraulics

Hydraulics

? - ?802.3 Chemical Operations

Chemical Operations

? - ?804 Chemical Products Generally

Chemical Products Generally

? - ?931 Classical Physics; Quantum Theory; Relativity

Classical Physics; Quantum Theory; Relativity

Numerical data indexing: Percentage 3.10e+01%, Percentage 5.20e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.029

Compendex references: YES

Database: Compendex

 

 

      

39. Flexible track stress distribution considering slip subsidence

Accession number: 20171203478188

Authors: Sun, Zhongxing (1); Tang, Liwei (1); Wang, Wei (1); Zhao, Jiafeng (1); Shen, Chenhui (1); Sun, Yezun (2)

Author affiliation: (1) Department of Artillery Engineering, Ordnance Engineering College, Shijiazhuang; 050003, China; (2) Representative Organization of Factory 247, Taiyuan; 030000, China

Corresponding author: Tang, Liwei(tom6115@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 317-324

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Track terramechanics, of which the track stress distribution is the bottleneck, plays an important role in the areas of track mechanism’s design, optimizing, control and simulation. Semi-empirical method and soil trough experiment were combined. Soil shear flow and distribution of slip line during the movement of track mechanism were analyzed on the basis of KARAFIATH concept. The algorithm of amount of soil loss caused by slip, which was used to correct the traditional track-terrain stress distribution model, was raised. Sinkage data of track gathered from soil trough experiment was input to the established model, and then the distributions of normal and shear stresses were obtained. The experimental system of track mechanism-soil interaction composed of soil trough and track-type trolley device as well as its supporting driving element and real-time test system through which can obtain parameters such as driving moment of the motor, horizontal displacement of trolley, sinkage in the traveling process of the trolley, inclined angle of the vehicle body, and motor speed, as well as the variation from the start to the smooth operation of the trolley device was designed and constructed according to the new test system of soil bin developed by the Key Laboratory of Bionic Engineering of Ministry of Education. Laser range finder was constructed with turnplate to realize the stage extraction of shape of track not in contact with a road wheel. The vehicle load, track width and slip rate were taken as experimental factors, the mechanism sinkage was taken as experimental index, and orthogonal experiment design method was adopted. The relative error between numerical calculation and experiment results of normal stress in vertical direction of track mechanism was less than 15%, and correlation coefficient was equal to or more than 0.83 when the weight was 6 kg and slip rate was varied from 0.23 to 0.71. The stress model can be used to build mathematical model of interaction between tracked vehicle and terrain. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 14

Main heading: Shear flow

Controlled terms: Range finders? - ?Shear stress? - ?Soils? - ?Stress concentration? - ?Tracked vehicles? - ?Vehicles

Uncontrolled terms: Correlation coefficient? - ?Flexible track? - ?Horizontal displacements? - ?Normal and shear stress? - ?Orthogonal experiment design? - ?Semi-empirical methods? - ?Stress distribution models? - ?Terramechanics

Classification code: 483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?631.1 Fluid Flow, General

Fluid Flow, General

? - ?663 Buses, Tractors and Trucks

Buses, Tractors and Trucks

? - ?943.1 Mechanical Instruments

Mechanical Instruments

Numerical data indexing: Mass 6.00e+00kg, Percentage 1.50e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.042

Compendex references: YES

Database: Compendex

 

 

      

40. Effect of different surface energies on pressure drop characteristics of flow boiling in microchannels

Accession number: 20171203478146

Authors: Luo, Xiaoping (1); Xie, Mingyu (1); Guo, Feng (1); Li, Haiyan (1)

Author affiliation: (1) School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou; 510640, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 406-412

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: With the wide application of microchannel heat exchanger, more and more researches focus on the microchannels and the pressure drop characteristics are important research object. Pure refrigerant R141b was used as working fluid in microchannels to carry out boiling flow experiments and explore the effect of surface energy on flow boiling pressure drop characteristics. Fluoroalkylsilane solution in different concentrations was used to modify the surface energy of different microchannel tests with size of 2.0 mm×1.0 mm, and tests were obtained with different surfaces energy. The flow boiling pressure drop characteristics were experimentally investigated through the tests by using R141b refrigerant. The influence of surface energy on pressure drop were investigated, and then a modified model was got. The results showed that the surface energy of tests were low with long immersion time and high concentration, and the tests with low surface energy had big numerical value of frictional pressure drop. The two-phase frictional pressure drop was increased by 5.1% and 12.7%, respectively. The predicted values of different correlated models were compared with experiment values, and a modified model which had a better predicted result was obtained, the mean absolute error was decreased obviously. The result provided supplement for the research on flow boiling resistance characteristics. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 18

Main heading: Microchannels

Controlled terms: Drops? - ?Friction? - ?Interfacial energy? - ?Pressure drop? - ?Pressure effects? - ?Refrigerants? - ?Testing? - ?Two phase flow

Uncontrolled terms: Fluoroalkylsilanes? - ?Frictional pressure drops? - ?Mean absolute error? - ?Micro-channel heat exchangers? - ?Modified model? - ?Pressure drop characteristic? - ?Resistance characteristics? - ?Two-phase frictional pressure drop

Classification code: 631.1 Fluid Flow, General

Fluid Flow, General

? - ?803 Chemical Agents and Basic Industrial Chemicals

Chemical Agents and Basic Industrial Chemicals

? - ?931.1 Mechanics

Mechanics

Numerical data indexing: Percentage 1.27e+01%, Percentage 5.10e+00%

DOI: 10.6041/j.issn.1000-1298.2017.01.053

Compendex references: YES

Database: Compendex

 

 

      

41. Effect of crude phenol extract in grape skin and wine on angiogenesis activity of zebrafish

Accession number: 20171203478180

Authors: Sun, Haiyan (1, 2); Wang, Hua (3); Xu, Zhimin (4); Li, Hua (3)

Author affiliation: (1) College of Food Science and Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Shaanxi Key Laboratory of Resource Biology, Shaanxi Sci-Tech University, Hanzhong; 723000, China; (3) College of Enology, Northwest A&F University, Yangling; Shaanxi; 712100, China; (4) Department of Food Science, Louisiana State University, Baton Rouge; LA; 70803, United States

Corresponding author: Wang, Hua(wanghua@nwsuaf.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 260-266

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Crude polyphenols were extracted from two types of grape skins and two wines. Total antioxidant activities and in vitro DPPH free radical scavenging activities of the extracts were evaluated. Meanwhile, the effect of those extracts on angiogenesis inhibition was investigated by using transgenic zebrafish model. After zebrafish embryos were treated with the crude polyphenol extracts for 22 h, the inhibitory effect on the intersegmental vessel (ISV) of zebrafish was investigated. The results indicated that the wines and grape skins all had in vitro antioxidant activities. However, the DPPH free radical scavenging activity and total antioxidant activity of wines were higher than those of grape skins. Wine 1 had the highest DPPH free radical scavenging activity (89.42%), which was 1.29 percentage points higher than that of wine 2. Wine 2 had the highest total antioxidant activity of 223.24 U/mL. Compared with control groups, zebrafish treated with crude polyphenol extracts of wines had significantly less ISV formation. Wine 1 had better inhibitory activity on ISV and dorsal longitudinal anastomotic vessel (DLAV) formation. However, the crude polyphenol extracts of grape skins showed little inhibitory effects on ISV and DLAV formation of zebrafish. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 29

Main heading: Free radicals

Controlled terms: Antioxidants? - ?Plants (botany)? - ?Wine

Uncontrolled terms: Angiogenesis? - ?Anti-oxidant activities? - ?DPPH free radical scavenging activities? - ?Inhibitory activity? - ?Polyphenol extract? - ?Polyphenols? - ?Transgenic zebrafish? - ?Zebrafish

Classification code: 803 Chemical Agents and Basic Industrial Chemicals

Chemical Agents and Basic Industrial Chemicals

? - ?804 Chemical Products Generally

Chemical Products Generally

? - ?822.3 Food Products

Food Products

Numerical data indexing: Percentage 8.94e+01%, Time 7.92e+04s

DOI: 10.6041/j.issn.1000-1298.2017.01.034

Compendex references: YES

Database: Compendex

 

 

      

42. Extraction method of maize planting information based on UAV remote sensing techonology

Accession number: 20171203478164

Authors: Han, Wenting (1, 2); Li, Guang (1); Yuan, Mengchan (1); Zhang, Liyuan (1); Shi, Zhiqiang (1)

Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Soil and Water Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 139-147

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: A method of information extraction for maize at jointing stage was described by using the high-resolution visible images, which were obtained by the unmanned aerial vehicle (UAV) remote sensing system. The 27 texture features of five ground objects were calculated separately, including maize, wheat, sunflower, sapling and bare land in the region of interest obtained by using co-occurrence measures and convolutions low pass. Comparing the variation coefficient of five ground objects and the relative difference with maize, the mean of green, homogeneity of blue and texture low pass vegetation index (TLVI) were chosen as the feature to obtain planting information of maize. In order to distinguish the maize land and sapling land, the TLVI was built by using scatter diagram in which the X-axis was the low-pass red band and the Y-axis was the low-pass blue band of maize land and sapling land. In the preliminary result, it was found that there were patches which had the same feature with maize land in wheat land and sapling land and patches of other kinds in the maize land. By analyzing the uniqueness of shape and area of two kinds of patches, the other patches were removed and the patches of maize land were retained. In order to verify the applicability and the reliability of the method, two different images which were in the same period with the region of interest were chosen to process by using the same method. The results indicated that the method could extract planting information of maize through using the high-resolution visible images obtained by the UAV remote sensing system and the area extraction error was less than 20%. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 28

Main heading: Remote sensing

Controlled terms: Image processing? - ?Image segmentation? - ?Information analysis? - ?Information retrieval? - ?Unmanned aerial vehicles (UAV)? - ?Vegetation

Uncontrolled terms: High resolution visible? - ?Low-pass? - ?Maize? - ?Region of interest? - ?Remote sensing system? - ?UAV remote sensing? - ?Variation coefficient? - ?Visible image

Classification code: 652.1 Aircraft, General

Aircraft, General

? - ?903.1 Information Sources and Analysis

Information Sources and Analysis

? - ?903.3 Information Retrieval and Use

Information Retrieval and Use

Numerical data indexing: Percentage 2.00e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.018

Compendex references: YES

Database: Compendex

 

 

      

43. Hydrodynamics and mixing process analysis of liquid-liquid two-phase flow in microfluidic T-junction

Accession number: 20171203478145

Authors: Yang, Li (1); Zhang, Hui (2); Wang, Yuanyuan (1); Cheng, Jingmeng (1); Li, Shanshan (1)

Author affiliation: (1) School of Mechanical Engineering, Hebei University of Technology, Tianjin; 300130, China; (2) Graduate School, Hebei University of Technology, Tianjin; 300130, China

Corresponding author: Li, Shanshan(lssharbin@gmail.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 397-405

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to reveal the characteristics of droplet mixing in a microfludic T-junction, the dynamic mixing process in droplet was studied by numerical simulations and experiments. The microfluidic chip was manufactured by soft lithography based on polydimethylsiloxane (PDMS), and the experiment phenomena of droplet formation and mixing process were analyzed with microscope system. The research results showed that the mixing efficiency was significantly influenced by the twirling effect which controlled the initial distributions of mixture during the droplet formation stage. While the droplet was separated from the dispersed phase in the junction region, the combined effect of viscous shear exerted by the continuous phase and the re-orientation of flow induced a vortex in the dispersed phase. As the two-phase interface in the droplet was rotated by the twirling effect, the mixed solutions were distributed to the front and back parts of the droplets. Therefore, the internal recirculation flow can bring in convection mechanism thus improving mixing. The twirling effect was noticeably influenced by the velocity of continuous phase. When the velocity of the continuous phase was slow, the twirling effect cannot distribute effectively for long droplets because of the large amount of fluid contained in the droplets. In contrast, the twirling effect appeared to be very effective for short droplets as the amount of fluid was small. When the flow velocity of the continuous phase was 0.04 μL/min, the mixing index was 0.82, which was two times higher than that of the mixing index when the flow velocity of the continuous phase was 0.005 μL/min. This study provided the insight of droplet formation and mixing performance inside the droplet in droplet-based microfluidics and it should be helpful for microdevice design and optimization. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 31

Main heading: Two phase flow

Controlled terms: Drop formation? - ?Drops? - ?Flow velocity? - ?Fluidic devices? - ?Intersections? - ?Microchannels? - ?Microfluidics? - ?Mixing? - ?Phase interfaces? - ?Polydimethylsiloxane ? - ?Shear flow? - ?Silicones? - ?Velocity

Uncontrolled terms: Design and optimization? - ?Droplet-based microfluidics? - ?Internal recirculations? - ?Microfluidic T junctions? - ?Microscope systems? - ?Polydimethylsiloxane PDMS? - ?Twirling effect? - ?Two-phase interfaces

Classification code: 631 Fluid Flow

Fluid Flow

? - ?631.1 Fluid Flow, General

Fluid Flow, General

? - ?632.2 Hydraulic Equipment and Machinery

Hydraulic Equipment and Machinery

? - ?632.5.1 Microfluidics

Microfluidics

? - ?801.4 Physical Chemistry

Physical Chemistry

? - ?802.3 Chemical Operations

Chemical Operations

? - ?815.1.1 Organic Polymers

Organic Polymers

? - ?931.2 Physical Properties of Gases, Liquids and Solids

Physical Properties of Gases, Liquids and Solids

DOI: 10.6041/j.issn.1000-1298.2017.01.052

Compendex references: YES

Database: Compendex

 

 

      

44. Design and experiment of combined operation machine for potato harvesting and plastic film pneumatic auxiliary collecting

Accession number: 20171203478155

Authors: Dai, Fei (1); Zhao, Wuyun (1); Sun, Wei (1); Wu, Zhengwen (2); Song, Xuefeng (1); Li, Yong (1)

Author affiliation: (1) College of Engineering, Gansu Agricultural University, Lanzhou; 730070, China; (2) Gansu Wuwei Business Flourishes Agricultural Machinery Manufacturing Co., Ltd., Wuwei; 733018, China

Corresponding author: Zhao, Wuyun(zhaowy@gsau.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 64-72

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: According to the problems of field plastic film pollution caused by the cultivation pattern of potato big ridge double line which was promoted in large area in Northwest China, the combined operation machine for potato harvesting and plastic film pneumatic auxiliary collecting was designed, which had synchronous implementation function of potato harvesting and plastic film pneumatic collecting. Based on design and selection of key operation parts for the prototype, the structure and operation parameters of ladder digging blade, soil-potato dither conveyor device and floating pneumatic curl-up film mechanism were determined. The operation process of floating pneumatic curl-up film mechanism was analyzed and the conditions to make sure that the floating pneumatic curl-up film mechanism did not produce the phenomenon of plastic film remained and jam, tensile and skid were achieved, the conditions of wheel did not slip but rolling in the field were analyzed and calculated. For the relevant work performance test of prototype, the field experiment results showed that when the operation speed of the combined operation machine was 1.8~2.0 km/h, the plastic film collecting ratio was 91.6%, the obvious ratio of potato was 96.8% and the injury ratio of potato was 2.3%, which met the relevant work quality evaluation specification requirements, and also the experiment results met the design requirements of combined operation machine. The research achievement would provide an important reference for root-tuber crop collecting machine development under plastic film mulching cultivation. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: Plastic films

Controlled terms: Cultivation? - ?Harvesting? - ?Pneumatics

Uncontrolled terms: Combined operations? - ?Machine development? - ?Operation parameters? - ?Operation process? - ?Plastic film mulching? - ?Potato? - ?Research achievements? - ?Specification requirement

Classification code: 632.3 Pneumatics

Pneumatics

? - ?817.1 Polymer Products

Polymer Products

? - ?821.3 Agricultural Methods

Agricultural Methods

Numerical data indexing: Percentage 2.30e+00%, Percentage 9.16e+01%, Percentage 9.68e+01%, Velocity 5.00e-01m/s to 5.56e-01m/s

DOI: 10.6041/j.issn.1000-1298.2017.01.009

Compendex references: YES

Database: Compendex

 

 

      

45. AWPSO-SM algorithm for parallel mechanism forward kinematics

Accession number: 20171203478192

Authors: Yang, Hui (1); Hao, Li’na (1); Xiang, Chaoqun (1)

Author affiliation: (1) School of Mechanical Engineering and Automation, Northeastern University, Shenyang; 110819, China

Corresponding author: Hao, Li’na(haolina@me.neu.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 346-352 and 412

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: By a combination of the numerical iteration method and the intelligent optimization algorithm, the adaptive weight particle swam optimization with secant method (AWPSO-SM) was presented which was applied for solving the parallel mechanism forward kinematics problems. Then, the 3-UCU (U is universal pair, C is cylindrical pair) parallel mechanism was treated as the research object, and then the detailed solving process of AWPSO-SM was given, namely, the inverse kinematics model of 3-UCU parallel mechanism was established firstly; based on the model, the iterated function and fitness function was designed, and then the forward kinematics of the 3-UCU parallel mechanism was solved by AWPSO-SM. Finally, the effectiveness and accuracy of AWPSO-SM was verified via several numerical examples of 3-UCU parallel mechanism, 3-PPR (P is prismatic pair, R is revolute joint) parallel mechanism and 4-SPS (S is spherical joint) parallel mechanism which were the typical parallel mechanisms in Matlab environment. From simulation results, AWPSO-SM avoids the effects of the local convergence and the initial value on the calculation results, and could solve the forward kinematics of the 3-UCU parallel mechanism effectively. Moreover, AWPSO-SM avoids the complicated derivation process and has simple calculating process. AWPSO-SM has better accuracy with little iteration times and universality than AWPSO and secant method. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 16

Main heading: Mechanisms

Controlled terms: C (programming language)? - ?Inverse kinematics? - ?Inverse problems? - ?Iterative methods? - ?Kinematics? - ?MATLAB? - ?Numerical methods? - ?Optimization

Uncontrolled terms: Calculation results? - ?Forward kinematics? - ?Forward kinematics problem? - ?Intelligent optimization algorithm? - ?MATLAB environment? - ?Numerical iteration? - ?Parallel mechanisms? - ?Particle Swam Optimization

Classification code: 601.3 Mechanisms

Mechanisms

? - ?723.1.1 Computer Programming Languages

Computer Programming Languages

? - ?921 Mathematics

Mathematics

? - ?931.1 Mechanics

Mechanics

DOI: 10.6041/j.issn.1000-1298.2017.01.046

Compendex references: YES

Database: Compendex

 

 

      

46. Simulation of tracking control of pneumatic artificial muscle based on fast switching valves

Accession number: 20171203478195

Authors: Xie, Shenglong (1); Liu, Haitao (1); Mei, Jiangping (1); Wang, Panfeng (1)

Author affiliation: (1) Key Laboratory of Mechanism Theory and Equipment Design, Ministry of Education, Tianjin University, Tianjin; 300072, China

Corresponding author: Liu, Haitao(liuht@tju.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 368-374 and 385

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Due to the problem of nonlinear and time-varying exists in the model of the pneumatic artificial muscle (PAM) trajectory tracking control system, the modeling of the trajectory tracking control of PAM driven by fast switching valves was detailed in order to enhance the trajectory tracking control accuracy of PAM and reduce the cost of control scheme. A feedback PID controller based on the experimental model of PAM was proposed to achieve its high accuracy trajectory tracking control. The control system was divided into three subsystems, which were pneumatic artificial muscle, fast switching valve and the PWM signal. Firstly, the static model of PAM was established by the isometric experiment, and then the dynamic characteristic model of PAM was developed based on the polytropic equation, in which the air mass flow rate through the fast switching valve was evaluated by using the Sanville equation. The PWM signal that was used to control the fast switching valves was generated referring to the pulse signal modulation method. Sequentially, the pressure and trajectory tracking control models of PAM were derived by means of feedback PID controller, based on which the simulations of pressure and trajectory tracking control were implemented in the environment of Matlab/Simulink. The results indicated that the control model can achieve satisfactory performance and accuracy, which validated the feasibility of the proposed model and control scheme. Thus, it provided an effective approach for high accuracy trajectory tracking control of PAM. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Feedback

Controlled terms: Control systems? - ?Controllers? - ?Electric control equipment? - ?Equations of state? - ?Feedback control? - ?MATLAB? - ?Muscle? - ?Navigation? - ?Pneumatic drives? - ?Pneumatics ? - ?Proportional control systems? - ?Pulse amplitude modulation? - ?Switching? - ?Three term control systems? - ?Trajectories

Uncontrolled terms: Dynamic characteristic models? - ?Effective approaches? - ?Experimental modeling? - ?Fast switching? - ?Isometric experiments? - ?Pneumatic artificial muscle? - ?Trajectory tracking? - ?Trajectory tracking control

Classification code: 461.2 Biological Materials and Tissue Engineering

Biological Materials and Tissue Engineering

? - ?632.3 Pneumatics

Pneumatics

? - ?632.4 Pneumatic Equipment and Machinery

Pneumatic Equipment and Machinery

? - ?731.1 Control Systems

Control Systems

? - ?732.1 Control Equipment

Control Equipment

? - ?921 Mathematics

Mathematics

DOI: 10.6041/j.issn.1000-1298.2017.01.049

Compendex references: YES

Database: Compendex

 

 

      

47. Forward kinematics optimization of 3-RPS parallel manipulator based on global-best artificial bee colony algorithm

Accession number: 20171203478191

Authors: Mao, Bingyan (1); Xie, Zhijiang (1); Wu, Xiaoyong (1); Yuan, Yuejun (1)

Author affiliation: (1) State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing; 400044, China

Corresponding author: Xie, Zhijiang(xie@cqu.edu.cn)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 339-345

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: A fast numerical algorithm for the forward kinematics optimization of 3-RPS parallel manipulator was presented. Through numerical optimization methods, the problem of forward kinematics of parallel robot was inverted to minimization problem. According to the optimization of forward kinematics for 3-RPS parallel manipulator, the forward kinematic functions, which were the multi-objective nonlinear equations with constraint, were built based on numerical method. The fitness function was established to achieve the optimization of single objective, and the minimum optimization was solved based on the global-best artificial bee colony algorithm. The information carried by employed bees was exchanged among the neighboring bees. The position information was exchanged randomly and the neighborhood bees were chosen randomly as the standard artificial bee colony algorithm. In addition, for the global-best artificial bee colony algorithm, the global best bee which carried the best position information would guide all bees to move to the better position, and convergence fast to the best position. As the simulation result of 3-RPS forward numerical kinematics showed, compared with continuous ant colony algorithm and standard artificial bee colony algorithm, the global-best artificial bee colony algorithm was an effective way, which with high precision and high speed, to solve forward kinematics of parallel manipulators. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Optimization

Controlled terms: Ant colony optimization? - ?Evolutionary algorithms? - ?Kinematics? - ?Manipulators? - ?Nonlinear equations? - ?Numerical methods

Uncontrolled terms: Artificial bee colony algorithms? - ?Continuous Ant Colony Algorithm? - ?Fast numerical algorithm? - ?Forward kinematics? - ?Minimization problems? - ?Numerical optimizations? - ?Parallel manipulators? - ?Position information

Classification code: 921.5 Optimization Techniques

Optimization Techniques

? - ?921.6 Numerical Methods

Numerical Methods

? - ?931.1 Mechanics

Mechanics

DOI: 10.6041/j.issn.1000-1298.2017.01.045

Compendex references: YES

Database: Compendex

 

 

      

48. Remote sensing monitor and evaluation on patch morphology changing in land consolidation areas

Accession number: 20171203478160

Authors: Zhang, Chao (1); Liu, Jiajia (1); Chen, Yingyi (1); Lü, Yahui (1); Yang, Jianyu (1, 2); Zhu, Dehai (1, 2)

Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory for Agricultural Land Quality, Monitoring and Control, Ministry of Land and Resources, Beijing; 100035, China

Corresponding author: Chen, Yingyi(chyingyi@126.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 104-111

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to objectively monitor and evaluate the effectiveness of land consolidation, a new method to identify filed patch data was proposed, which was based on remote sensing imagery and taking arable land polygon data as constraints. The field patch data identified by using this method not only had regional characteristics, but also considered ownership information to some extent. On this basis, evaluation index system in field and regional levels was respectively built for cultivated field patch fragmentation’s degree. Patch area, regularity, compactness and connectivity were chosen as evaluation indexes in field level and mean area, density of field patch, LAI, LSI and PAFRAC were chosen as evaluation indexes in regional level. And then the indexes in two levels were made to be dimensionless respectively. The method was applied to Guangxi hilly areas and Hainan plains. The results of experiment showed that after consolidation, the majority of comprehensive evaluation index in field level of Guangxi region was improved from 50~70 to 70~90, and that in Hainan plains was improved from 70~90 to 90~100. The comprehensive evaluation index in regional level of Guangxi hilly areas was increased from 41 to 83 after land consolidation, and that in Hainan plains was increased from 63 to 92. The proposed method for identifying field patch can support the monitor and evaluation of land consolidation projection aimed at land fragmentation, no matter study areas located in hilly areas or plain areas. Hence, the research result can provide support for remote sensing monitor and evaluation in land consolidation areas and remote sensing discerning of well-facilitated farmland. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Remote sensing

Controlled terms: Landforms? - ?Monitoring

Uncontrolled terms: Comprehensive evaluation index? - ?Evaluation? - ?Evaluation index system? - ?Land consolidations? - ?Land fragmentations? - ?Object oriented classification? - ?Regional characteristics? - ?Remote sensing imagery

Classification code: 481.1 Geology

Geology

DOI: 10.6041/j.issn.1000-1298.2017.01.014

Compendex references: YES

Database: Compendex

 

 

      

49. Trinity comprehensive regulatory system about quantity, quality and ecology of cultivated land

Accession number: 20171203478147

Authors: Zhang, Chao (1, 2); Qiao, Min (1); Yun, Wenju (2, 3); Liu, Jiajia (1); Zhu, Dehai (1, 2); Yang, Jianyu (1, 2)

Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory for Agricultural Land Quality, Monitoring and Control, Ministry of Land and Resources, Beijing; 100035, China; (3) Land Consolidation and Rehabilitation Center, Ministry of Land and Resources, Beijing; 100035, China

Corresponding author: Yun, Wenju(yunwenju@vip.sina.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 1-6

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The cultivated land is the basis of food security and the foundation of state. In order to regulate the cultivated land in China synthetically and three-dimensionally, according to Chinese national conditions, trinity comprehensive regulatory system about the quantity, quality and ecology of the cultivated land was studied from the perspective of system theory and public administration. Through literature analysis method combined with cutting-edge technology, the ecological regulation theory was improved based on the current relatively mature theory of cultivated land quantity, quality supervision system, the innovation of ecological regulation theory was researched, the index of cultivated land quantity, quality and ecology was constructed, and then a trinity comprehensive index system was built on this basis. Through data acquisition system of remote sensing technology, the internet of things and the internet to real-timely acquire multi-source data, and through cleansing and integration, to build cloud database that is a supervision technology system can be promoted and easy to replicate in the test points all over the country. Researching regulatory index rapid computing technology, the trinity comprehensive regulatory system was set up based on multi-source data, distributed service-oriented cultivated land. The cultivated land trinity supervision platform was constructed, it would make idea into a finished product, and provided service for government depatrments and regulatory decisions. The trinity supervision system of the cultivated land can provide technical support for the regulation and maintenance of the cultivated land in China. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: Distributed computer systems

Controlled terms: Computation theory? - ?Data acquisition? - ?Ecology? - ?Food supply? - ?Image quality? - ?Land use? - ?Public administration? - ?Remote sensing

Uncontrolled terms: Cultivated lands? - ?Cutting edge technology? - ?Data acquisition system? - ?Literature analysis method? - ?Monitoring and management? - ?Quantity? - ?Remote sensing technology? - ?Trinity

Classification code: 403 Urban and Regional Planning and Development

Urban and Regional Planning and Development

? - ?454.3 Ecology and Ecosystems

Ecology and Ecosystems

? - ?721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory

Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory

? - ?722.4 Digital Computers and Systems

Digital Computers and Systems

? - ?723.2 Data Processing and Image Processing

Data Processing and Image Processing

? - ?822.3 Food Products

Food Products

? - ?971 Social Sciences

Social Sciences

DOI: 10.6041/j.issn.1000-1298.2017.01.001

Compendex references: YES

Database: Compendex

 

 

      

50. Virtual simulation and power test of disc type ditcher based on multi-body dynamics

Accession number: 20171203478154

Authors: Kang, Jianming (1, 2); Li, Shujun (1); Yang, Xuejun (1, 3); Liu, Lijing (3, 4); Wang, Changwei (4)

Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China; (2) Mechanical Equipment Research Institute, Xinjiang Academy of Agricultural and Reclamation Science, Shihezi; 832000, China; (3) Collaborative Innovation Center for Southern Grain and Oil Crop, Changsha; 410128, China; (4) Modern Agricultural Equipment Co., Ltd., Beijing; 100083, China

Corresponding author: Liu, Lijing(xylijj@sina.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 57-63

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aiming at the problem of that the power consumption of disc type ditcher is difficult to test, a virtual test platform evaluation disc type ditcher set power consumption method was proposed. Firstly, the dynamics model of disc type ditcher was established. In order to shorten the operation time, the secondary characteristics such as chamfer, fillet and connection were omitted. The boundary conditions and loads were set up. The virtual simulation of power consumption in disc type ditcher was carried out with trenching depths of 400 mm and 500 mm, forward speeds of 0.8 km/h and 1.5 km/h, rotation speeds of 180 r/min and 220 r/min, respectively. The power curve of ditch process showed that at the beginning of soil cutting, power consumption was increased quickly, the reason for which was a great deal of power consumption was needed during the process of soil deformation and broken. After that the power consumption was tended to be stable, for the reason of which was the binding force was tended to be less after the soil particle was destroyed. Then the field power test system was built and the relative errors were 6.88% and 7.73%, respectively, compared with simulation results. The accuracy and feasibility of the proposed method were verified. Finally, totally 18 conditions (three trenching depths, two forward speeds, and three rotating speeds) were selected to carry out the simulation. The results showed that with a certain trenching depth, the disc type ditcher had an increasing linear relationship with forward speed and rotation speed. With a certain ditching depth and forward speed, the lowest power consumption was appeared at rotation speed of 200 r/min. Moreover, with a large trenching depth and forward speed, the effect of rotation speed on power consumption was obvious. When the rotary speed was 200 r/min, both low and high speeds, disc type ditcher had the lowest power consumption value. According to comparison at rotary speed of 219 r/min in different ditching depths and forward speeds, the power consumption at rotary speed of 200 r/min was decreased by 8.5 kW, 9.6 kW and 4.6 kW, the results provided a theoretical basis for power consumption measurement of rotary ditcher. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Speed

Controlled terms: Compressive strength? - ?Electric power utilization? - ?Mechanics? - ?Rotation? - ?Shafts (machine components)? - ?Soils? - ?Testing? - ?Trenching? - ?Virtual reality

Uncontrolled terms: Consumption measurement? - ?Ditcher? - ?Dynamics modeling? - ?Linear relationships? - ?Multi-body dynamic? - ?Relative errors? - ?Virtual simulations? - ?Virtual tests

Classification code: 483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?601.2 Machine Components

Machine Components

? - ?619.1 Pipe, Piping and Pipelines

Pipe, Piping and Pipelines

? - ?706.1 Electric Power Systems

Electric Power Systems

? - ?723 Computer Software, Data Handling and Applications

Computer Software, Data Handling and Applications

? - ?931.1 Mechanics

Mechanics

Numerical data indexing: Percentage 6.88e+00%, Percentage 7.73e+00%, Power 4.60e+03W, Power 8.50e+03W, Power 9.60e+03W, Rotational_Speed 1.80e+02RPM, Rotational_Speed 2.00e+02RPM, Rotational_Speed 2.19e+02RPM, Rotational_Speed 2.20e+02RPM, Size 4.00e-01m, Size 5.00e-01m, Velocity 2.22e-01m/s, Velocity 4.17e-01m/s

DOI: 10.6041/j.issn.1000-1298.2017.01.008

Compendex references: YES

Database: Compendex

 

 

      

51. Preparation and characteristics of curcumin-loaded GA-zein composite nanoparticles

Accession number: 20171203478181

Authors: Fu, Yuying (1, 2); Li, Kexin (1); Wang, Mei (1); Shen, Yali (1); Chen, Guowen (1); Li, Xin (1)

Author affiliation: (1) School of Food and Bio-technology, Zhejiang Gongshang University, Hangzhou; 310018, China; (2) Hangzhou College of Commerce, Zhejiang Gongshang University, Hangzhou; 310015, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 267-274

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Influence of GA-zein core-shell structure on the curcumin embedding efficiency and status of curcumin after embedding treatment was investigated by taking advantage of the zein delivery functionality and stabilizing with Arabic gum, parameters such as mean particle diameters, zeta potential and absorbance were measured. The result showed that evenly dispersed globular nanoparticles were formulated under low zein concentration condition, as the increase of zein concentration, adhesion, aggregating and meltdown etc. transformation effects were occurred among the nanoparticles. It is necessary to add stabilizer to enhance the stability of zein delivery system. Stabilizing efficiency of different types of stabilizer were compared, and the result showed that stability of GA-zein-cur dispersed system reached peak when the system was stabilized with 0.3 g Arabic gum; GA-zein-cur nanoparticles were the most stable when the quality ratio of curcumin and zein reached 110, and the embedding efficiency was 95.90%, an even, stable and highly transparent curcumin aqueous solution was formulated. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Nanoparticles

Controlled terms: Efficiency? - ?Gallium? - ?Solutions? - ?System stability? - ?Zein

Uncontrolled terms: Composite nanoparticles? - ?Core shell structure? - ?Curcumin? - ?Dispersed systems? - ?Embedding? - ?Embedding efficiency? - ?Mean particle diameter? - ?Transformation effects

Classification code: 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals

Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals

? - ?761 Nanotechnology

Nanotechnology

? - ?804.1 Organic Compounds

Organic Compounds

? - ?913.1 Production Engineering

Production Engineering

? - ?933 Solid State Physics

Solid State Physics

? - ?961 Systems Science

Systems Science

Numerical data indexing: Mass 3.00e-04kg, Percentage 9.59e+01%

DOI: 10.6041/j.issn.1000-1298.2017.01.035

Compendex references: YES

Database: Compendex

 

 

      

52. Nondestructive testing for internal quality of watermelon based on sub-band spectrum centroid of impact vibration

Accession number: 20171203478183

Authors: Pu, Hongjie (1, 2); Wang, Disong (1); Li, Zhenfeng (1, 2)

Author affiliation: (1) School of Mechanical Engineering, Jiangnan University, Wuxi; 214122, China; (2) Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi; 214100, China

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 281-288

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: For the purpose of testing the watermelon’s interior quality nondestructively, the sub-band spectrum centroid of the impact vibration response was employed as the characteristic parameter to describe and model the soluble solid content (SSC) and the flesh color of watermelon. A total of 76 watermelon samples were used in the experiments, for both the nondestructive vibration tests and the destructive SSC and color tests. Different impact methods and positions were attempted to validate the robustness of the sub-band spectrum centroid as a characteristic parameter. The results showed that the sub-band spectrum centroid had low dependency on different impact methods and positions, which could greatly simplify the complexity of the testing system. The optimized sub-bands were obtained for modeling the SSC and the a*value of color with determination coefficients of 0.812 4 and 0.733 6, respectively, which were higher than that when the resonant frequencies were used as the characteristic parameter. Linear models were made for both SSC and a*value. The vibration sub-band spectrum centroid was gone down monotonously along with the SSC (sub-band 144~416 Hz) and a*(sub-band 148~428 Hz) value, with the slope of -1.361 and -1.019, respectively. However, the sub-band spectrum centroid had low ability of describing the L*and b*values in color testing, whose determination coefficients were only 0.52 and 0.148, respectively. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Color

Controlled terms: Natural frequencies? - ?Nondestructive examination

Uncontrolled terms: Internal quality? - ?Maturity? - ?Soluble solid content? - ?Subbands? - ?Watermelon

Classification code: 741.1 Light/Optics

Light/Optics

Numerical data indexing: Frequency 1.44e+02Hz to 4.16e+02Hz, Frequency 1.48e+02Hz to 4.28e+02Hz

DOI: 10.6041/j.issn.1000-1298.2017.01.037

Compendex references: YES

Database: Compendex

 

 

      

53. Design and experiment of grafting-clip transporting mechanism of full automatic grafting machine for whole-row vegetable seedlings

Accession number: 20171203478149

Authors: Li, Jun (1, 2); Zhang, Tiezhong (2); Chu, Jia (2); Zhang, Libo (2); Zhang, Wenbo (2); Yin, Quan (2)

Author affiliation: (1) College of Mechanical and Electrical Engineering, Beijing Union University, Beijing; 100020, China; (2) College of Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: Zhang, Tiezhong(zhangtz56@163.com)

Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery

Abbreviated source title: Nongye Jixie Xuebao

Volume: 48

Issue: 1

Issue date: January 25, 2017

Publication year: 2017

Pages: 14-20

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: To increase the working efficiency of full automatic grafting machines for whole-row vegetable seedlings in a cell tray, the field of automatic feeding of grafting clips was studied and a grafting-clip transporting mechanism was presented. In a working cycle, this mechanism could transport five grafting clips and clamp whole-row grafting seedlings synchronously. There were three parts in a grafting-clip transporting mechanism, including an automatic grafting-clip sorting and feeding mechanism, a grafting-clip transporting platform and a linear motion mechanism. In the mechanism, automatic orientation and sorting of grafting clips were realized by a vibration device and automatic feeding was driven by a cylinder; automatic transporting of five grafting clips was achieved by a linear motion mechanism which was driven by a stepping motor; cylinders and pneumatic grippers were applied to drive and control the grafting-clip opening to clamp five grafting seedlings synchronously. The experimental study on the mechanism was completed and relative performance parameters were confirmed. The experimental results indicated that the time spent on a working cycle of the grafting-clip transporting mechanism was about 12.5 s, the success rate of grafting-clip feeding could reach 94.7%, and the success rate of grafting-seedling clamping was 92%. Consequently, the grafting-clip transporting mechanism could meet the requirements of the technology of whole-row grafting; the research results laid a solid foundation for the further study on full automatic grafting machines for whole-row vegetable seedlings in a cell tray. ? 2017, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 17

Main heading: Grafting (chemical)

Controlled terms: Cylinders (shapes)? - ?Design? - ?Experiments? - ?Feeding? - ?Mechanisms? - ?Stepping motors? - ?Vegetables

Uncontrolled terms: Automatic feeding? - ?Grafting seedlings? - ?Linear-motion mechanisms? - ?Pneumatic grippers? - ?Relative performance? - ?Vegetable seedlings? - ?Vibration sorting-clip device? - ?Working efficiency

Classification code: 601.3 Mechanisms

Mechanisms

? - ?691.2 Materials Handling Methods

Materials Handling Methods

? - ?705.3 Electric Motors

Electric Motors

? - ?802.2 Chemical Reactions

Chemical Reactions

? - ?821.4 Agricultural Products

Agricultural Products

? - ?901.3 Engineering Research

Engineering Research

Numerical data indexing: Percentage 9.20e+01%, Percentage 9.47e+01%, Time 1.25e+01s

DOI: 10.6041/j.issn.1000-1298.2017.01.003

Compendex references: YES

Database: Compendex