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2018年第4期共收录50

1. Design and Experiment of 3SCJ-1 Type Weeding Machine for Paddy Field Applied to Film Mulching and Transplanting

Accession number: 20182605375681

Authors: Wang, Jinwu (1); Li, Chao (1); Li, Xin (1); Li, Xiang (1); Wang, Jinfeng (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: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 102-109

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Rice mulching and transplanting technology is a great innovation in organic rice cultivation. It has many advantages such as temperature-increasing, water-holding, fertilizer-maintaining, improving physical and chemical properties, raising fertility, reducing weed growth, alleviating disease, increasing yield and so on. There are many researches about paddy weeding machine around the world, however, there is no mature weeding machine for mulching rice in paddy field. A new type of 3SCJ-1weeding machine was designed by using new weeding components for transplanting rice of organic rice. The motor power of the machine was provided by a two-stroke engine, which consisted frame, power transmission system, floater and compound weeding components, including walking wheel and weeding device. It achieved pulling and bury-pressing on weeds through the rotation of weeding device, kinematics and dynamics analysis of the weeding device were carried out at the same time. In June 2017, experiments were conducted in Wuchang by taking the forward speed and weeding depth as variables, and taking weeding rate as index. The results showed that when the forward speed was increased from 0.3 m/s to 0.6 m/s, the weeding rate was increased first and then decreased, and the weeding rate reached the maximun, which was 78.52% at the forward speed of 0.45 m/s; when the weeding depth was ranged from 50 mm to 110 mm, the weeding rate was increased continuously, however, considering the power consumption of weeding machine, the best weeding depth was 50~100 mm, and the weeding rate reached 79.26% at the weeding depth of 100 mm, the average weeding rate of the weeding machine was 78.02%, which could satisfy the weeding agronomic requirements of mulching paddy field. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: Machine components

Controlled terms: Electric power transmission? - ?Experiments

Uncontrolled terms: Kinematics and dynamics analysis? - ?Mulching and transplanting? - ?Organic rice? - ?Paddy fields? - ?Physical and chemical properties? - ?Power transmission systems? - ?Two-stroke engine? - ?Weeding machines

Classification code: 601.2 Machine Components

Machine Components

? - ?706.1.1 Electric Power Transmission

Electric Power Transmission

? - ?901.3 Engineering Research

Engineering Research

Numerical data indexing: Percentage 7.80e+01%, Percentage 7.85e+01%, Percentage 7.93e+01%, Size 1.00e-01m, Size 5.00e-02m to 1.00e-01m, Size 5.00e-02m to 1.10e-01m, Velocity 3.00e-01m/s to 6.00e-01m/s

DOI: 10.6041/j.issn.1000-1298.2018.04.012

Compendex references: YES

Database: Compendex

 

      

2. Automatic Extraction of High-throughput Phenotypic Information of Grain Based on Point Cloud

Accession number: 20182605375698

Authors: Huang, Xia (1, 2); Zheng, Shunyi (1, 2); Gui, Li (1, 2); Zhao, Like (1); Ma, Hao (1)

Author affiliation: (1) School of Remote Sensing and Information Engineering, Wuhan University, Wuhan; 430079, China; (2) Collaborative Innovation Center of Geospatial Technology, Wuhan; 430079, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 257-264 and 248

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Large amount of grain phenotypic information is needed in researches such as digital grain traits investigation, phenotype and gene association analysis and digital agriculture simulation. A method for automatic extraction of grain high-throughput phenotypic information based on point cloud was proposed, aiming to automatically obtain three-dimensional (3D) grain model and 40 phenotypic parameters. Firstly, the classification of grain point cloud was completed through cluster analysis. Secondly, 3D grain model was reconstructed with cylindrical mesh method. Finally, according to the characteristics of different phenotypic parameters, 11 primary parameters, 11 derived parameters and 18 shape factors were automatically extracted. Experiment using data obtained by hand-held laser scanner (Handyscan 700) showed that the measurement result could reach millimeter level. The weight of each phenotypic parameter was analyzed based on principal component analysis method. With parameters measured by vernier caliper and Geomagic Studio as the true value, the average relative error of length, width, height, surface area and volume, the cross-sectional area of three principal component sections was 1.14%, 1.15%, 1.62%, 0, 1.82%, 2.12% and 2.43%, respectively. Compared with the manual measurement method and the software measurement method, the results of the proposed method was competitively accurate, which had advantages of batch processing, automation, less manual intervention (only in data acquisition) and high efficiency. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 30

Main heading: Principal component analysis

Controlled terms: Automation? - ?Batch data processing? - ?Cluster analysis? - ?Data acquisition? - ?Extraction? - ?Grain (agricultural product)? - ?Software engineering? - ?Three dimensional computer graphics? - ?Throughput

Uncontrolled terms: Average relative error? - ?Manual measurement methods? - ?Phenotypic information? - ?Point cloud? - ?Principal component analysis method? - ?Principal Components? - ?Software Measurement? - ?Three-dimensional (3D) grains

Classification code: 723 Computer Software, Data Handling and Applications

Computer Software, Data Handling and Applications

? - ?731 Automatic Control Principles and Applications

Automatic Control Principles and Applications

? - ?802.3 Chemical Operations

Chemical Operations

? - ?821.4 Agricultural Products

Agricultural Products

? - ?922.2 Mathematical Statistics

Mathematical Statistics

Numerical data indexing: Percentage 1.14e+00%, Percentage 1.15e+00%, Percentage 1.62e+00%, Percentage 1.82e+00%, Percentage 2.12e+00%, Percentage 2.43e+00%

DOI: 10.6041/j.issn.1000-1298.2018.04.029

Compendex references: YES

Database: Compendex

 

      

3. Response of Soil N2O Fluxes to Soil Nitrifying and Denitrifying Bacteria under Aerated Irrigation

Accession number: 20182605375704

Authors: Chen, Hui (1, 2); Li, Liang (1, 3); Cai, Huanjie (1, 2); Zhu, Yan (1, 3); Wang, Yunfei (1, 3); Xu, Jiatun (1, 3)

Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China

Corresponding author: Cai, Huanjie(caihj@nwsuaf.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 303-311

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Air injection and irrigation affect soil aeration, oxygen partial pressure and nitrogen turnover, which are bound to affect the processes of nitrification and denitrification, and influence production and emission of N2O. In order to study the response of soil N2O fluxes to nitrifying and denitrifying bacteria under aerated irrigation, the experiment was conducted in greenhouse tomato fields from August to December, 2016. Based on the irrigation amount of adequate water supply (W), 0.6W, 0.8W and 1.0W were set as three different irrigation regimes. Each irrigation regime contained aeration and non-aeration. Hence, six treatments were set. The results showed that a downward trend of soil N2O fluxes was observed during the earlier stage of tomato, while soil N2O fluxes held at a relatively stable and low level since 25 d after transplanting. Compared with non-aerated irrigation, aerated irrigation increased soil N2O emissions by 4.7% on average. Soil N2O emissions were increased with the increase of irrigation volume, which were increased by 1.9% on average. But the treatment effects between aeration and irrigation regimes on soil N2O emissions were not significant (P>0.05). In terms of the mean values of microbial population throughout the whole tomato growth period, nitrifying bacteria under aerated irrigation was increased by 2.1% on average compared with non-aerated irrigation, and denitrifying bacteria was decreased by 9.7% on average (P>0.05). In addition, nitrifying and denitrifying bacteria were increased with the increase of irrigation amount (P>0.05). Correlation analysis showed that the dependence of soil N2O flux on WFPS and soil temperature showed a significantly positive correlation under all treatments (P2O flux was significantly and negatively correlated with denitrifying bacteria under different irrigation modes (P ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 45

Main heading: Bacteria

Controlled terms: Denitrification? - ?Fruits? - ?Irrigation? - ?Nitrification? - ?Nitrogen? - ?Population statistics? - ?Soils? - ?Water supply

Uncontrolled terms: Denitrifying bacteria? - ?Irrigation amounts? - ?Microbial populations? - ?Nitrification and denitrification? - ?Nitrifying bacteria? - ?Oxygen partial pressure? - ?Positive correlations? - ?Theoretical foundations

Classification code: 446.1 Water Supply Systems

Water Supply Systems

? - ?483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?802.2 Chemical Reactions

Chemical Reactions

? - ?804 Chemical Products Generally

Chemical Products Generally

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?821.4 Agricultural Products

Agricultural Products

Numerical data indexing: Percentage 1.90e+00%, Percentage 2.10e+00%, Percentage 4.70e+00%, Percentage 9.70e+00%, Power 1.00e+00W, Power 6.00e-01W, Power 8.00e-01W

DOI: 10.6041/j.issn.1000-1298.2018.04.035

Compendex references: YES

Database: Compendex

 

      

4. Optimal Path Tracking Control Method of Omni-directional Mobile AGV Based on Pose State

Accession number: 20182605375671

Authors: Qian, Xiaoming (1, 2); Zhu, Liqun (1, 2); Lou, Peihuang (1, 2); Zhang, Husong (1, 2)

Author affiliation: (1) College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing; 210016, China; (2) Jiangsu Key Laboratory of Precision and Micro-manufacturing Technology, Nanjing; 210016, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 20-26

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: An optimal control method based on pose state and limited steps of control sequences was presented for path tracking of an omni-directional mobile automated guided vehicles (AGV), as the key of automated guided vehicle autonomous movement was precise path tracking. Firstly, under the system constraints, the continuous system was discretized by establishing the kinematic model and analyzing the kinematic model of the system. Secondly, by selecting the two order integral function as the objective function of the optimal control, a selection of weighted matrix for optimal control was avoided when an objective function only included one item of speed control and a control sequence of the system control quantity was obtained by minimizing objective function. Meanwhile, the limited steps of control sequences were also beneficial to the rolling control of real time embedded controller. In addition, the control efficiency of the system can be improved by reducing the number of control steps under the condition that the control cycle was determined and the control performance was satisfied. Finally, simulation and experiment results showed that when the system was stable, the angle error of the path tracking was within 2°, the distance error was less than 2 mm, and the control time was 0.8~1.2 s. Thus the algorithm can eliminate pose error quickly, synchronously and stably for different speeds, and the computation was small and convenient. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 18

Main heading: Automatic guided vehicles

Controlled terms: Errors? - ?Kinematics? - ?Mobile robots

Uncontrolled terms: Automated guided vehicles? - ?Automatically guided vehicles? - ?Discrete systems? - ?Embedded controllers? - ?Omni-directional mobiles? - ?Optimal control methods? - ?Optimal controls? - ?Path tracking

Classification code: 731.5 Robotics

Robotics

? - ?731.6 Robot Applications

Robot Applications

? - ?931.1 Mechanics

Mechanics

Numerical data indexing: Size 2.00e-03m, Time 8.00e-01s to 1.20e+00s

DOI: 10.6041/j.issn.1000-1298.2018.04.002

Compendex references: YES

Database: Compendex

 

      

5. Guided Trajectory Planning Method for Tractor Autopilot System

Accession number: 20182605375673

Authors: Jia, Quan (1); Zhang, Xiaochao (1); Yuan, Yanwei (1); Zhao, Bo (1); Wei, Liguo (1); Fu, Tuo (1)

Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China

Corresponding author: Zhang, Xiaochao(zxc@caams.org.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 36-44

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The existing tractor autopilot system relies on the built-in path tracking algorithm to approach a target point on the global path when the driver starts the navigation mode at any position in the field. The tracking path will produce a shock phenomenon near the target point, it will affect the path tracking accuracy, and the entire approach process is uncontrollable. In order to solve this problem, a guided trajectory planning method based on third-order B-spline theory was proposed. The trajectory with the minimum length was taken as the desired path, the maximum curvature constraint, the maximum steering angle constraint and the heading of starting goal point constraint were taken into account. Quantum genetic algorithm (QGA) was used to optimize the control points, and finally the B-spline theory was used to generate a smooth desired trajectory. Four kinds of operating conditions were tested in Matlab environment. The simulation results showed that the B-spline theory based on the QGA could be used to obtain a trajectory satisfying the multiple nonlinear constraints, and the trajectory curvature change was continuous, which was beneficial to the path tracking controller. A field test was carried out, and the results showed that the pure pursuit algorithm alone had a travel distance of 78.6 m, and the travel distance based on the guided trajectory planning method was 23.7 m. Compared with the existing autopilot system, the trajectory planning method based on B-spline theory was helpful to control the shape of tracking path and improve the controllability of approach process. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: Trajectories

Controlled terms: Air navigation? - ?Approximation theory? - ?Genetic algorithms? - ?Interpolation? - ?MATLAB? - ?Target tracking? - ?Tractors (agricultural)? - ?Tractors (truck)

Uncontrolled terms: Autopilot systems? - ?B splines? - ?Curvature constraints? - ?Non-linear constraints? - ?Pure-pursuit algorithms? - ?Quantum genetic algorithm? - ?Trajectory Planning? - ?Trajectory planning method

Classification code: 431.5 Air Navigation and Traffic Control

Air Navigation and Traffic Control

? - ?663.1 Heavy Duty Motor Vehicles

Heavy Duty Motor Vehicles

? - ?921 Mathematics

Mathematics

? - ?921.6 Numerical Methods

Numerical Methods

Numerical data indexing: Size 2.37e+01m, Size 7.86e+01m

DOI: 10.6041/j.issn.1000-1298.2018.04.004

Compendex references: YES

Database: Compendex

 

      

6. Research Progress of Conservation Tillage Technology and Machine

Accession number: 20182605375670

Authors: He, Jin (1); Li, Hongwen (1); Chen, Haitao (2); Lu, Caiyun (1); Wang, Qingjie (1)

Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Engineering, Northeast Agricultural University, Harbin; 150030, China

Corresponding author: Li, Hongwen(lhwen@cau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 1-19

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Conservation tillage technologies mainly contain no/minimum tillage seeding, crop residue management, subsoilling technology and topsoil tillage technology. Based on the analysis of global adoption, technical modes and application benefits of conservation tillage, this paper reviewed the working principle, technical characteristics and developing trends of conservation tillage in four key parts, including crop straw and residue management, topsoil tillage technologies and machines, no/minimum tillage seeding key technologies, and subsoiling technologies. Combined with the research progress and application requirements of conservation tillage in China, current technical difficulties were analyzed and generalized, and future research emphasis and development direction were provided as following aspects: improving processing craft and materials of machine’s key components, strengthening basic theoretical research, optimizing machine structure, enhancing the intelligent measuring and controlling technologies and information management ability of machines, combination of agricultural machine with agronomy under conservation tillage, forming regional-suited technical pattern and system. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 117

Main heading: Agricultural machinery

Controlled terms: Agricultural wastes? - ?Crops? - ?Information management? - ?Machine components? - ?Research and development management? - ?Soil conservation

Uncontrolled terms: Application requirements? - ?Conservation tillage? - ?Crop residue management? - ?Development directions? - ?Residue management? - ?Technical difficulties? - ?Theoretical research? - ?Topsoil tillage

Classification code: 483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?601.2 Machine Components

Machine Components

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

Agricultural Equipment and Methods; Vegetation and Pest Control

? - ?901.3 Engineering Research

Engineering Research

DOI: 10.6041/j.issn.1000-1298.2018.04.001

Compendex references: YES

Database: Compendex

 

      

7. Effect of Variable Heating Rate on Pyrolysis Process and Product Characteristics of Corn Stalk

Accession number: 20182605375708

Authors: Wang, Yajun (1); Li, Lijie (2); Deng, Yuanfang (1); Yao, Zonglu (2); Qiu, Ling (1, 3); Zhao, Lixin (2)

Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Chinese Academy of Agricultural Engineering, Beijing; 100125, China; (3) Northwest Research Center of Rural Renewable Energy Exploitation and Utilization, Ministry of Agriculture, Yangling; Shaanxi; 712100, China

Corresponding author: Qiu, Ling(ql2871@126.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 337-342 and 350

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The influence of heating rate on slow pyrolysis was explored. The corn stalks were tested via two types of variable heating rate comparing with three types of constant heating rate. The products such as char, pyrolysis bio-oil and non-condensable gases at different heating rates were also detected. The pyrolysis by decreasing heating rate resulted in 29.82% char and 27.49% non-condensable gases. While the increasing heating rate caused higher bio-oil yield which was not benefit to the production of char and pyrolysis gas. Thermo-gravimetric analysis of the raw materials showed that variable heating rate significantly changed the weight loss during pyrolysis process. It was found that CO and CO2were released earlier than CH4and H2by performing gas chromatography test. In the higher temperature zone, the concentration of H2was increased. The analysis of the main components in bio-oil confirmed that less macromolecular organic matter content was detected after pyrolysis by decreasing heating rate. While the increasing heating rate produced more polycyclic aromatic hydrocarbons. The concept of variable heating rate was presented. It was found that the pyrolysis by decreasing heating rate not only made sure the yields of chars and pyrolysis gas, but also increased the char yield by 4.49%, and deduced the bio-oil yield by 4.51% and this process was more to the benefit of poly-co-production with char and pyrolysis gas as the main products. This concept would provide new ideas for the project of biomass pyrolysis. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Heating rate

Controlled terms: Biofuels? - ?Gas chromatography? - ?Gases? - ?Gravimetric analysis? - ?Heating? - ?Polycyclic aromatic hydrocarbons? - ?Pyrolysis? - ?Thermogravimetric analysis

Uncontrolled terms: Biomass pyrolysis? - ?Corn stalk? - ?Non-condensable gas? - ?Organic matter content? - ?Product characteristics? - ?Products? - ?Pyrolysis process? - ?Variable heating rates

Classification code: 641.2 Heat Transfer

Heat Transfer

? - ?801 Chemistry

Chemistry

? - ?802.2 Chemical Reactions

Chemical Reactions

? - ?802.3 Chemical Operations

Chemical Operations

? - ?804.1 Organic Compounds

Organic Compounds

Numerical data indexing: Percentage 2.75e+01%, Percentage 2.98e+01%, Percentage 4.49e+00%, Percentage 4.51e+00%

DOI: 10.6041/j.issn.1000-1298.2018.04.039

Compendex references: YES

Database: Compendex

 

      

8. EGR Performance Test and Evaluation of Turbocharged Diesel Engine with Venturi Tube Structure

Accession number: 20182605375715

Authors: Zu, Xianghuan (1); Yang, Chuanlei (1); Wang, Yinyan (1); Wang, Hechun (1); Du, Jun (2)

Author affiliation: (1) College of Power and Energy Engineering, Harbin Engineering University, Harbin; 150001, China; (2) Unit 91458, Sanya; 572000, China

Corresponding author: Wang, Yinyan(wyyzxm@sina.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 389-396 and 419

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Taking a certain type of V-type supercharged diesel engine as the research object, and the original rated working point was selected as the design working point, the venturi tube structure (EGR) system was designed. The effects of different EGR rates on the combustion and emission performance of diesel engine under different working conditions were studied. On the basis of the experimental analysis, a multi-objective gray decision evaluation method based on gray relational analysis optimization was proposed to evaluate the EGR performance and the optimal EGR rate under different working conditions. The results showed that when the EGR rate was increased to about 8%, the NOxof all the operating point can be reduced by 25%, while smoke and fuel consumption only had a small increase. At the same speed, the diesel engine smoke emission was higher when it was at high load and high EGR rate, and NOxemission was decreased linearly with the increase of EGR rate. The optimal EGR rate can be obtained successfully by the optimized evaluation method and it was showed that a small EGR rate obtained a high comprehensive evaluation value when the diesel engine was in the low speed condition, therefore, a small EGR rate should be adopted. With the increase of diesel engine speed, the high EGR rate obtained a high evaluation value. However, when diesel engine speed was too high, the corresponding assessment value was reduced and it was not appropriate to take an excessive rate. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Diesel engines

Controlled terms: Exhaust gas recirculation? - ?Exhaust gases? - ?Hydraulics? - ?Nitrogen oxides? - ?Nozzles? - ?Speed

Uncontrolled terms: Combustion and emission performance? - ?Comprehensive evaluation? - ?Experimental analysis? - ?Gray correlation analysis? - ?Gray relational analysis? - ?Supercharged diesel engines? - ?Turbocharged diesel engine? - ?Venturi tube

Classification code: 451.1 Air Pollution Sources

Air Pollution Sources

? - ?612.1.1 Internal Combustion Engine Components

Internal Combustion Engine Components

? - ?612.2 Diesel Engines

Diesel Engines

? - ?632.1 Hydraulics

Hydraulics

? - ?804.2 Inorganic Compounds

Inorganic Compounds

Numerical data indexing: Percentage 2.50e+01%, Percentage 8.00e+00%

DOI: 10.6041/j.issn.1000-1298.2018.04.046

Compendex references: YES

Database: Compendex

 

      

9. Design and Experiment on Seedling Separation Device of Panax notoginseng Seedlings Based on Roller Zigzag Mechanism

Accession number: 20182605375683

Authors: Lai, Qinghui (1); Yuan, Haikuo (1); Hu, Ziwu (1); Su, Wei (1)

Author affiliation: (1) College 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: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 121-129

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The transplantation of Panax notoginseng seedlings are always relying on artificial, resulting in low operation efficiency and poor planting quality. Panax notoginseng seedlings may be easily intertwined with another, the existing separation device cannot effectively separate Panax notoginseng seedlings, the seedling separation device is a key component to achieve planting mechanization of Panax notoginseng. In order to obtain discrete and orderly seeding of Panax notoginseng seedlings, a kind of seedling separation device of Panax notoginseng seedlings transplanter based on roller serrated mechanism was designed. Based on theoretical calculation, the main components were designed, including spike, roter, roller, seedling feeding device and so on. The number of helix, length of rotor nail, length of the nail and the number of guide grooves were taken as the virtual testing factors, and virtual prototype model was created according to different levels parameter of structural by Solidworks, and then the models were imported into the discrete element simulation analysis software EDEM, the seedling variation coefficient and discrete index were used as index to launch single factor and orthogonal simulation experiments. The results showed that the optimum structure parameters were as follows: the number of spiral was 4, the rotor nail tooth length was 70 mm, the roller nail tooth length was 65 mm and the guide groove number was 3, at this time, the separating coefficient of variation of separation device was minimal and discrete exponent was the highest. Through the practical experiments, the simulation results were verified, and the results were consistent with the simulation results: the minimum coefficient of variation was 17.37%, the highest separation rate was 84.69%, and the broken rate was 7.5%. The research achieved the orderly and discrete separation of Panax notoginseng seedlings, which provided a reference for the further study of Panax notoginseng and other rhizome crops separation device. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Separation

Controlled terms: Finite difference method? - ?Rollers (machine components)? - ?Seed? - ?Software testing? - ?Structural optimization? - ?Virtual reality

Uncontrolled terms: Coefficient of variation? - ?Discrete element simulation? - ?Operation efficiencies? - ?Panax notoginseng? - ?Theoretical calculations? - ?Transplanter? - ?Variation coefficient? - ?Virtual prototype models

Classification code: 601.2 Machine Components

Machine Components

? - ?723 Computer Software, Data Handling and Applications

Computer Software, Data Handling and Applications

? - ?723.5 Computer Applications

Computer Applications

? - ?802.3 Chemical Operations

Chemical Operations

? - ?821.4 Agricultural Products

Agricultural Products

? - ?921.5 Optimization Techniques

Optimization Techniques

? - ?921.6 Numerical Methods

Numerical Methods

Numerical data indexing: Percentage 1.74e+01%, Percentage 7.50e+00%, Percentage 8.47e+01%, Size 6.50e-02m, Size 7.00e-02m

DOI: 10.6041/j.issn.1000-1298.2018.04.014

Compendex references: YES

Database: Compendex

 

      

10. Kiwifruit Orchard Mapping Based on Wavelet Textures and Random Forest

Accession number: 20182605375694

Authors: Song, Rongjie (1, 2); Ning, Jifeng (2); Chang, Qingrui (1); Ban, Songtao (1); Liu, Xiuying (3); Zhang, Hongming (2)

Author affiliation: (1) College of Natural Resources and Environment, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) College of Information Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) College of Agronomy, Henan University of Science and Technology, Luoyang; 471003, China

Corresponding author: Chang, Qingrui(changqr@nwsuaf.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 222-231

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to obtain the distribution information of the kiwifruit orchards in high spatial resolution remote imagery fast and accurately, a hybrid method for automatic detection of kiwifruit orchard based on wavelet transform and random forest classification algorithm was proposed. Firstly, a wavelet transform based texture extracting process was carried out on the QuickBird panchromatic band by means of a two level decomposition with coif5 biorthogonal wavelet function, and the multi-scale wavelet textures were further derived from the energy characteristics of the wavelet coefficients in each sub-band. Secondly, the wavelet textures and spectral features were combined to construct the classification feature vectors. Finally, the kiwifruit orchard distributions were automatically delineated through land cover classification by using the random forest ensemble technique. The wavelet textures were found to be more effective in identifying kiwifruit orchard compared with the multi spectral features, gray level co-occurrence matrix (GLCM) textural features and fractal textural features. There was an obvious increase in kiwifruit orchard extracting accuracy (Fk) and overall classification accuracy (OA) when spectral features were combined with textural features compared with spectral-only and texture-only features. The highest classification accuracies were achieved by the integration of spectral features and the multi-scale wavelet texture features (spectral + wavelet TF) with Fkof 95.30% and OA of 94.46%, which was 6.70% and 2.88% higher respectively than those of the results of spectral+ GLCM features and 13.43% and 6.98% higher respectively than those of spectral + fractal features. Among the three classifiers used, the random forest classifier demonstrated the best performance in terms of OA and Fk, followed by support vector machine classifier and the maximum likelihood classifier under the same features. The extracted area of kiwifruit orchard was also assessed by the visual interpretation results and the relative error was less than 7%. An apple orchard extracting experiment in another test region was carried out by using the same method, and the results indicated that the method had good applicability. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 36

Main heading: Classification (of information)

Controlled terms: Decision trees? - ?Fractals? - ?Maximum likelihood? - ?Orchards? - ?Remote sensing? - ?Wavelet decomposition

Uncontrolled terms: Gray level co occurrence matrix(GLCM)? - ?Kiwifruits? - ?Maximum likelihood classifiers? - ?Quickbird? - ?Random forest classification? - ?Random forests? - ?Support vector machine classifiers? - ?Wavelet texture

Classification code: 716.1 Information Theory and Signal Processing

Information Theory and Signal Processing

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?921 Mathematics

Mathematics

? - ?921.3 Mathematical Transformations

Mathematical Transformations

? - ?922.1 Probability Theory

Probability Theory

? - ?961 Systems Science

Systems Science

Numerical data indexing: Percentage 1.34e+01%, Percentage 2.88e+00%, Percentage 6.70e+00%, Percentage 6.98e+00%, Percentage 7.00e+00%, Percentage 9.45e+01%, Percentage 9.53e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.025

Compendex references: YES

Database: Compendex

 

      

11. Joint Multifractal of Corn Ear Weight and Its Affecting Factors in Black Soil Region

Accession number: 20182605375707

Authors: Liu, Jilong (1, 2); Zhang, Lingling (3); Fu, Qiang (1, 2); Ren, Gaoqi (1); Liu, Lu (1); Yu, Peng (1)

Author affiliation: (1) School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin; 150030, China; (2) Key Laboratory of Effective Utilization of Agricultural Water Resources, Ministry of Agriculture, Harbin; 150030, China; (3) College of Science, Northeast Agricultural University, Harbin; 150030, China

Corresponding author: Fu, Qiang(fuqiang@neau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 330-336

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to reveal scale effects of relationships between corn ear weight and its affecting factors, the spatial variability of corn ear weight and its effect factors were firstly studied with geostatistics and multifractal methods, and then the relationships between corn ear weight and its affecting factors were analyzed at the multi-scale with joint multifractal. The results showed that corn ear weight had medium variation, variation degree of stem diameter changed from medium to weak variation with time, and other affecting factors of corn ear weight had weak variation; spatial correlation ranges of corn ear weight and its affecting factors were from 7.15 m to 66.51 m; spatial correlation degrees of corn ear weight, chlorophyll content, soil bulk density and volume fractal dimension of soil particle-size distribution were strong, and the ones of stem diameter, soil moisture and saturated soil moisture were medium; stem diameter and chlorophyll content had remarkable influences on spatial variability of corn ear weight at the single scale, and chlorophyll content, volume fractal dimension of soil particle-size distribution, stem diameter and soil moisture had noteworthy effects on its spatial variability at the multi-scale; most of correlation degrees of corn ear weight and its affecting factors at the multi-scale were more than corresponding ones at the single scale; at the single and multi-scale, as time changed, correlation degrees of corn ear weight and stem diameter were firstly increased and then decreased, but the times that the ones began to reduce were different. Multi-scale analysis could deeply and completely reveal correlations between corn ear weight and its affecting factors. The research results had great significance in revealing mechanism of spatial variability of corn ear weight, determining scale effects of relationships between corn ear weight and its affecting factors, guiding precision management of crop and soil and increasing crop production. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: Soil surveys

Controlled terms: Chlorophyll? - ?Crops? - ?Cultivation? - ?Fractal dimension? - ?Light transmission? - ?Particle size? - ?Particle size analysis? - ?Scales (weighing instruments)? - ?Size distribution? - ?Soil moisture

Uncontrolled terms: Affecting factors? - ?Black soil regions? - ?Chlorophyll contents? - ?Corn ear weight? - ?Multi fractals? - ?Multi scale analysis? - ?Spatial correlations? - ?Volume fractal dimensions

Classification code: 483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?741.1 Light/Optics

Light/Optics

? - ?804.1 Organic Compounds

Organic Compounds

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?821.4 Agricultural Products

Agricultural Products

? - ?921 Mathematics

Mathematics

? - ?922.2 Mathematical Statistics

Mathematical Statistics

? - ?943.3 Special Purpose Instruments

Special Purpose Instruments

? - ?951 Materials Science

Materials Science

DOI: 10.6041/j.issn.1000-1298.2018.04.038

Compendex references: YES

Database: Compendex

 

      

12. Measurement Method of Wheat Stalks Cross Section Parameters Based on Sector Ring Region Image Segmentation

Accession number: 20182605375675

Authors: Xu, Shengyong (1, 2); Peng, Chengli (1, 2); Chen, Ke (1, 2); Wang, Lingqiang (3); Ren, Xifeng (3); Duan, Hongbing (1, 2)

Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture, Wuhan; 430070, China; (3) College of Plant Science and Technology, Huazhong Agricultural University, Wuhan; 430070, China

Corresponding author: Duan, Hongbing(duanhb@mail.hzau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 53-59

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The observation and analysis of microstructure of crop stalk are of great value. Based on the structure and gray features of tissues in wheat stalk micrograph, a sector ring region-based image segmentation method was proposed, by which the sclerenchyma and vascular bundles in the micrograph would be separated from the background precisely. The inner and outer contours of the wheat stalks cross-section were got from an approximate annular. The annular that the sclerenchyma and vascular bundle belonged to was firstly located roughly. On the basis of the location information, the center of the section was taken as the origin and drawn rays towards to the outer contours of the annular. By this operation, the annular was divided into many small sector ring regions. Then small regions were segmented respectively by using the Otsu algorithm. Finally, the segmentation results were processed such as superposition, and the complete sclerenchyma or vascular bundle would be obtained. Using the segmentation results all kinds of parameters of the section would be evaluated accurately. It was showed that the method presented had higher accuracy and stronger robustness than the traditional Otsu method in segmenting the low-quality image which caused by slicing, dying and photographing in the process of micrograph acquisition. It improved the utilization rate of the slice sample and reduced the labor intensity. The accuracy of all the parameters obtained by using the measurement system was more than 94.6%, which would play an important practical role in the research of wheat stalk microstructure. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Image segmentation

Controlled terms: Measurement? - ?Microstructure? - ?Parameter estimation

Uncontrolled terms: Location information? - ?Measurement methods? - ?Measurement system? - ?Micrograph? - ?Region based image segmentation? - ?Segmentation results? - ?Utilization rates? - ?Wheat stalks

Classification code: 951 Materials Science

Materials Science

Numerical data indexing: Percentage 9.46e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.006

Compendex references: YES

Database: Compendex

 

      

13. Dimension and Structure Optimization Design of 5-DOF Hybrid Manipulator

Accession number: 20182605375718

Authors: Lu, Ling (1); Zhang, Dongsheng (1, 2); Xu, Yundou (1, 2); Yao, Jiantao (1, 2); Zhao, Yongsheng (1, 2)

Author affiliation: (1) College of Mechanical Engineering, Yanshan University, Qinhuangdao; 066004, China; (2) Parallel Robot and Mechatronic System Laboratory of Hebei Province, Yanshan University, Qinhuangdao; 066004, China

Corresponding author: Zhao, Yongsheng(yszhao@ysu.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 412-419

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In modern industrial applications, robot has become one of the most important parts, which has significant application prospects in the fields of simulation, logistics and machine processing. Actually, compared with parallel mechanisms’ compact structure, higher load capacity and higher stiffness, serial robots have the advantages of bigger workspace and easier control, which can be complementary with parallel mechanisms. Thus, hybrid manipulators, especially 5-degree-of-freedom (DOF) hybrid manipulators, combine the merits of both serial robots and parallel mechanisms. Firstly, the structure description of a novel 5-DOF hybrid manipulator was done. The parallel part of the hybrid manipulator 2RPU/UPR contained two continuous rotational axes. Secondly, the dimension optimization of the 5-DOF hybrid manipulator was introduced in detail. Then, mechanical design and analysis about the main parts of the hybrid manipulator were finished, and structure optimization was performed. Finally, finite element simulations considering different positions and orientations were achieved. The results before and after optimized hybrid manipulator were analyzed, which showed that the stiffness of the optimized manipulator was improved and the mass of it was reduced. The 5-DOF hybrid manipulator had the characteristics of owning continuous rotational axes, simple structure and less single DOF joint, which allowed for a very variety of application prospects. More importantly, the research would enhance the research applications of robot and lay good theoretical foundations for the application of this novel manipulator. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Manipulators

Controlled terms: Machine design? - ?Mechanisms? - ?Robots? - ?Stiffness? - ?Structural optimization

Uncontrolled terms: Application prospect? - ?Finite element simulations? - ?Mechanical design? - ?Parallel mechanisms? - ?Research applications? - ?Stiffness analysis? - ?Structure optimization? - ?Theoretical foundations

Classification code: 601 Mechanical Design

Mechanical Design

? - ?601.3 Mechanisms

Mechanisms

? - ?731.5 Robotics

Robotics

? - ?921.5 Optimization Techniques

Optimization Techniques

? - ?951 Materials Science

Materials Science

DOI: 10.6041/j.issn.1000-1298.2018.04.049

Compendex references: YES

Database: Compendex

 

      

14. Effect of Nitrogen Fertilizer Reduction on Endophytic Fungal Community Composition of Summer Maize in North China

Accession number: 20182605375705

Authors: Li, Ruixia (1, 2); Huo, Yanli (3); Li, Hongjie (4); Wang, Weishuai (1); Zhang, Aiping (1); Yang, Zhengli (1)

Author affiliation: (1) Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Science, Beijing; 100081, China; (2) College of Tourism, Hebei University of Economics and Business, Shijiazhuang; 050061, China; (3) College of Basic Medical, Hebei North University, Zhangjiakou; 075000, China; (4) Dezhou Academy of Agricultural Sciences, Dezhou; 253015, China

Corresponding author: Yang, Zhengli(13811869923@126.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 312-318

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aiming to define the effect of nitrogen fertilizer reduction on nodal root endophytic fungal communities of summer maize by using the method of Illumina Miseq high-throughput sequencing. Based on farmers’ practice for N fertilization, four treatments, i.e. 270 kg/hm2(CK: 0%), 243 kg/hm2(N1: -10%), 216 kg/hm2(N2: -20%) and 189 kg/hm2(N3: -30%) were applied. The results showed that the effects of N fertilizer amount reduction by 10%~30% on diversity index Chao1 of aboveground nodal roots were not significant, and the amount of N fertilizer reduction by 20%~30% increased significantly Chao1 index of underground nodal roots. The effects of amount of N fertilizer reduction by 10%~30% on the diversity index Shannon-Wiener index of aboveground nodal roots were noticeably increased, while the same index of underground nodal roots were noticeably decreased. N fertilizer amount reduction by 10%~30% increased significantly the abundance of Pleosporales in aboveground nodal roots, and increased significantly the abundance of Ascomycota, Sordariales and decreased significantly the abundance of Hypocreales and Xylariales in underground nodal roots. N fertilizer amount reduction by 10% increased significantly the abundance of Glomeromycota in nodal roots, and N fertilizer reduction by 30% only increased significantly the abundance of Glomeromycota of underground nodal roots. With the increase of proportion of nitrogen fertilizer reduction, the similarity coefficient was deceased gradually with CK treatment. The correlation analysis showed that grain number was significantly correlated with the abundance of Pleosporales of aboveground nodal roots, and the abundance of Glomeromycota and Hypocreales of underground nodal roots. Efficient spike number was significantly correlated with the abundance of Sordariales of underground nodal roots. By comprehensive comparison, the effect of amount of nitrogen fertilizer reduction by 30% on nodal root endophytic fungal communities was better than that of other treatments. Compared with CK treatment at the filling stage of summer maize, the abundance of Pleosporales of aboveground nodal roots was significantly increased by 809.95%; and the abundance of Glomeromycota and Sordariales of underground nodal roots was significantly increased, while the abundance of Hypocreales was significantly decreased by 78.14%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 29

Main heading: Nitrogen fertilizers

Controlled terms: Fungi

Uncontrolled terms: Diversity? - ?Endophytic fungi? - ?Nodal roots? - ?Summer maize? - ?Yield

Classification code: 804 Chemical Products Generally

Chemical Products Generally

Numerical data indexing: Percentage -1.00e+01%, Percentage -2.00e+01%, Percentage -3.00e+01%, Percentage 0.00e+00%, Percentage 1.00e+01%, Percentage 3.00e+01%, Percentage 7.81e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.036

Compendex references: YES

Database: Compendex

 

      

15. Growth Kinetics of Spoilage Organisms and Prediction of Shelf Life for Lateolabrax japonicus at Different Storage Temperatures

Accession number: 20182605375710

Authors: Lan, Weiqing (1, 2); Zhang, Wanjun (1); Duan, Xianyuan (1); Wu, Qiyue (1); Lu, Ying (1, 2); Xie, Jing (1, 2)

Author affiliation: (1) College of Food Science and Technology, Shanghai Ocean University, Shanghai; 201306, China; (2) Shanghai Engineering Research Center of Aquatic Product Processing and Preservation, Shanghai; 201306, China

Corresponding author: Xie, Jing(jxie@shou.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 351-358

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The aim was to predict the growth of specific spoilage organisms (SSO) for Lateolabrax japonicus at different storage temperatures. The circulation of Lateolabrax japonicus was simulated by different storage methods, such as slurry ice storage (-1.8), crush ice storage (0), cold storage 1 (4) and cold storage 2 (10). The kinetic growth of total viable counts, Shewanella counts and Pseudomonas counts were analyzed respectively, and the total volatile base nitrogen (TVB-N) and Quality index (QI) value at the end of the shelf life of Lateolabrax japonicus were evaluated at different temperatures. On the basis of the dynamic change of SSO with modified Gompertz equation, Belehradek equations and Arrhenius equations were used to construct the prediction models of growth and shelf life for SSO. The results showed that the modified Gompertz equation could describe the dynamic microbial growth in Lateolabrax japonicus at different storage temperatures and the average minimum corruption values of Shewanella counts and Pseudomonas counts were (6.48±0.41) lg CFU/g, (6.33±0.36) lg CFU/g respectively. Meanwhile, the applicability of models were validated under crush ice storage (0) and temperature-fluctuation conditions (slurry ice precooling (-1.8)-transportation without ice (0.8) -crush ice (0)). The bias factors (Bf) and accuracy factors (Af) of Shewanella counts and Pseudomonas counts from the models based on Belehradek equations were 0.993 6, 0.951 0 and 1.024 2, 0.982 1 and 1.084 5, 1.042 5, 1.107 5, 1.093 4, respectively, and the relative errors of shelf life model were within the range of 0~10%. The accuracy of Belehradek equation was better than that of Arrhenius equation. In conclusion, the models obtained by Belehradek equations were more effective for predicting the growth of SSO and the shelf life of Lateolabrax japonicus at different storage temperatures so as to provide the theoretical basis for predicting the shelf life of Lateolabrax japonicus. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 18

Main heading: Ice

Controlled terms: Bacteria? - ?Cold storage? - ?Forecasting? - ?Growth kinetics

Uncontrolled terms: Lateolabrax japonicus? - ?Prediction model? - ?Shelf life? - ?Specific spoilage organisms? - ?Storage temperatures

Classification code: 644.3 Refrigeration Equipment and Components

Refrigeration Equipment and Components

Numerical data indexing: Percentage 0.00e+00% to 1.00e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.041

Compendex references: YES

Database: Compendex

 

      

16. Difference of Soil Water Characteristic Curves of Subtropical Soils with NaCl Solutions Treatments and Models Optimization

Accession number: 20182605375702

Authors: Hu, Chuanwang (1); Wang, Hui (2); Wu, Yun (2); Lu, Jiayu (2); Liu, Chang (2)

Author affiliation: (1) College of Resources and Environment, Hunan Agricultural University, Changsha; 410128, China; (2) College of Engineering, Hunan Agricultural University, Changsha; 410128, China

Corresponding author: Wang, Hui(wanghuisb@126.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 290-296 and 329

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Long-term irrigation of low quality water carrying large amounts of salt causes a significant degradation risk of soil physicochemical properties. The determination of difference in the influence of salinity on soil water characteristic curve of five subtropical soils, such as clay fluvo aquic soil, sandy fluvo aquic soil, red soil, purple soil and paddy soil, were investigated and these soils treatments with four different NaCl solutions (0 g/L, 5 g/L, 10 g/L and 15 g/L) were prepared to obtain the soil water characteristic curves of drying processes by the pressure membrances method. The optimal models that described soil water characteristic curves of different salt concentration dealt soils were determined by RETC software and mathematical statistics method. The results showed that the sodium salt can improve the soil water holding capacity, and special significant effect for soil with high content clay. Available water contents of clay fluvo aquic soil, sandy fluvo aquic soil and red soil treated with NaCl solutions treatments were maximally reduced by 40.8%, 30.5% and 31.5%, respectively, and available water contents of purple soil and paddy soil were maximally increased by 45.7% and 28.9%, respectively. The Brooks and Corey model was the optimal model to describe the soil water characteristic curves of soils with less clay or treatments with salt solution of low concentration. The Dual-porosity-Mualem model was the optimal model for high clay content of the soils treated with salt solution of high concentration. The research results can serve as reference for the secondary salinization of soil, reclaimed water irrigation, calculation of water and salt transport in southern subtropics. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Curve fitting

Controlled terms: Irrigation? - ?Models? - ?Porosity? - ?Sodium chloride? - ?Soil moisture? - ?Soil structure interactions? - ?Statistics? - ?Tropics

Uncontrolled terms: Available water contents? - ?Long-term irrigations? - ?Mathematical statistics methods? - ?RETC? - ?Sodium salt? - ?Soil physico-chemical properties? - ?Soil-water characteristic curve? - ?Water and salt transports

Classification code: 443 Meteorology

Meteorology

? - ?483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?483.2 Foundations

Foundations

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?921.6 Numerical Methods

Numerical Methods

? - ?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: Mass_Density 0.00e+00kg/m3, Mass_Density 1.00e+01kg/m3, Mass_Density 1.50e+01kg/m3, Mass_Density 5.00e+00kg/m3, Percentage 2.89e+01%, Percentage 3.05e+01%, Percentage 3.15e+01%, Percentage 4.08e+01%, Percentage 4.57e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.033

Compendex references: YES

Database: Compendex

 

      

17. Method of Pump-control Differential Cylinder System with Speed and Position Compound Servo Control with Compensation Amount of Load Force

Accession number: 20182605375719

Authors: Wang, Chengbin (1); Quan, Long (1)

Author affiliation: (1) Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan; 030024, China

Corresponding author: Quan, Long(quanlong@tyut.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 420-426

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aiming at the pump-control differential cylinder system, the strategy of speed and position compound servo control with compensation amount of load force was put forward and the calculation models of controlled variable of speed feed-forward and compensation amount of load force were set up in order to improve the steady state and control accuracy. As for the stable switching between the speed control and position control, the switching parameters, including the difference between actual position and target location, and switching time were studied. The simulation model and the physical-experiment model of this system were set up to make study of simulation and experiment, the results demonstrated that the speed and position compound controlling strategy can be used to realize the control of speed and position of pump control differential cylinder system at the same time, which improved the motion stability of the differential cylinder on the prereguisite of controlling accuracy. Compared with the composite servo control, the system of separate position servo control was also studied in simulation and experiment. The comparing results showed that the composite control strategy mentioned above beared the obvious superiority. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Position control

Controlled terms: Cylinders (shapes)? - ?Pneumatic control equipment? - ?Pumps? - ?Speed? - ?Switching? - ?Time and motion study

Uncontrolled terms: Composite control strategy? - ?Compound control? - ?Controlling strategies? - ?Differential cylinder? - ?Load forces? - ?Physical experiments? - ?Pump control? - ?Undisturbed switching

Classification code: 461.4 Ergonomics and Human Factors Engineering

Ergonomics and Human Factors Engineering

? - ?618.2 Pumps

Pumps

? - ?632.4 Pneumatic Equipment and Machinery

Pneumatic Equipment and Machinery

? - ?731.3 Specific Variables Control

Specific Variables Control

DOI: 10.6041/j.issn.1000-1298.2018.04.050

Compendex references: YES

Database: Compendex

 

      

18. Characteristics of Soybean Protein-Phosphatidyl Choline with Nanoemulsions Powders

Accession number: 20182605375711

Authors: Jiang, Lianzhou (1); Zhang, Xiaoyuan (1); Liu, Ling (1); Li, Yang (1); Chen, Fusheng (2); Wang, Zhongjiang (1)

Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China; (2) College of Food Science and Technology, Henan University of Technology, Zhengzhou; 450052, China

Corresponding author: Wang, Zhongjiang(wzjname@126.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 359-365 and 74

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Vacuum lyophilizing method was used to prepare soybean protein-phosphatidyl choline emulsification powder after the ultrasonic treatment and high pressure homogenization, and the physical and chemistry characteristics of lyophilizing powder and reconstituted emulsion were determined by scanning electron microscopy, laser particle size analyzer and infrared spectrum. It was found that the reconstituted lyophilizing powder had good solubility, and the particle size of the emulsion was the same as that of the original emulsion. Scanning electron microscopy and lyophilized powder particle size distribution showed that the nanoemulsion powder prepared by high-pressure homogenization and ultrasonic had dense and uniform structure, the surface had no cracks and hole, the surface of powder prepared by high pressure homogeneous was more smooth, the particle size distribution showed unimodal distribution, the average particle size was only 6.13 μm. The entrapment efficiency and yield of nanoemulsion lyophilized powder prepared by ultrasound and high pressure homogenization both were more than 90%, while the nanoemulsion lyophilized powder prepared by ultrasonic preparation was more conducive to the package of β-carotene and better prevention of the loss of β-carotene. The results of infrared spectroscopy experiments showed that the α-helix and β-fold structure of the protein powder prepared by high pressure homogenization were slightly lower. And compared with the stability and shelf life of soybean protein-phosphatidyl choline nanoemulsions, a significant increase was showed for the lyophilized powder under the same storage conditions. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 29

Main heading: Particle size

Controlled terms: Emulsification? - ?Homogenization method? - ?Infrared spectroscopy? - ?Light transmission? - ?Particle size analysis? - ?Proteins? - ?Scanning electron microscopy? - ?Size distribution

Uncontrolled terms: High pressure homogenization? - ?Laser particle size analyzer? - ?Lyophilization? - ?Nanoemulsion? - ?Phosphatidyl choline? - ?Soybean proteins? - ?Ultrasonic preparations? - ?Ultrasonic treatments

Classification code: 741.1 Light/Optics

Light/Optics

? - ?802.3 Chemical Operations

Chemical Operations

? - ?804.1 Organic Compounds

Organic Compounds

? - ?921 Mathematics

Mathematics

? - ?922.2 Mathematical Statistics

Mathematical Statistics

? - ?951 Materials Science

Materials Science

Numerical data indexing: Percentage 9.00e+01%, Size 6.13e-06m

DOI: 10.6041/j.issn.1000-1298.2018.04.042

Compendex references: YES

Database: Compendex

 

      

19. Crop Classification Based on Data Fusion of Sentinel-1 and Sentinel-2

Accession number: 20182605375691

Authors: Guo, Jiao (1, 2); Zhu, Lin (1); Jin, Biao (1, 2)

Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Key Laboratory of Agricultural Internet of Things, Ministry of Agriculture, Yangling; Shaanxi; 712100, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 192-198

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Since remote sensing technology based on optical images is usually influenced by cloud and rain, it’s difficult to acquire continuous crop growth curves in some areas. Radar, as an active remote sensing technique, can overcome the disadvantage successfully. Taking the farm located in the city of Weinan of Shaanxi Province as study area, two methods of maximum likelihood (ML) and support vector machine (SVM) were adopted to combine multi-sensor remote sensing data of Sentinel-1 and Sentinel-2, and thus improve crop classification accuracy. The results showed that classification results with fusion data were better than those of optical data. The classification result of fusion data composed of Sentinel-1 and Sentinel-2’s red, green, blue and near-infrared bands with no cloud were improved evidently with SVM method. The overall accuracy and Kappa coefficient were raised by 2 percentage points and 5 percentage points, respectively. In the case of a few cloud cover in the study site, the overall accuracy and Kappa coefficient with ML method were increased by 2 percentage points and 4 percentage points, respectively. With SVM method, the overall accuracy and Kappa coefficient were raised by almost 6 percentage points and 8 percentage points, respectively. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Classification (of information)

Controlled terms: Crops? - ?Data fusion? - ?Geometrical optics? - ?Green computing? - ?Infrared devices? - ?Maximum likelihood? - ?Radar? - ?Radar imaging? - ?Remote sensing? - ?Support vector machines

Uncontrolled terms: Classification results? - ?Crop classification? - ?Near infrared band? - ?Optical image? - ?Overall accuracies? - ?Remote sensing data? - ?Remote sensing techniques? - ?Remote sensing technology

Classification code: 716.1 Information Theory and Signal Processing

Information Theory and Signal Processing

? - ?716.2 Radar Systems and Equipment

Radar Systems and Equipment

? - ?723 Computer Software, Data Handling and Applications

Computer Software, Data Handling and Applications

? - ?723.2 Data Processing and Image Processing

Data Processing and Image Processing

? - ?741.1 Light/Optics

Light/Optics

? - ?821.4 Agricultural Products

Agricultural Products

? - ?922.1 Probability Theory

Probability Theory

DOI: 10.6041/j.issn.1000-1298.2018.04.022

Compendex references: YES

Database: Compendex

 

      

20. Design and Experiment of Deep Fertilizer Applicator Based on Autonomous Navigation for Precise Row-following

Accession number: 20182605375676

Authors: Feng, Huimin (1, 2); Gao, Na’na (2); Meng, Zhijun (3); Chen, Liping (3); Li, You (2); Guo, Yuming (1)

Author affiliation: (1) College of Engineering, Shanxi Agricultural University, Taigu; 030801, China; (2) Beijing Research Center for Information Technology in Agriculture, Beijing; 100097, China; (3) Beijing Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China

Corresponding author: Guo, Yuming(guoyuming99@sina.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 60-67

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Broadcasting application of nitrogen at returning green stage results in ammonia volatilization and low nitrogen use efficiency. At present, the mechanized topdressing equipment is lacking in China, the precise fertilizer deep applicator was designed to meet the demand of mechanized subsurface topdressing fertilization for wheat, the precise row-following and accurate deep fertilizing method were studied based on autonomous navigation system. The applicator was driven by tractor mounted with autonomous navigation system to realize specific row-following operation, the speed of applicator was resolved by taking advantage of RTK-GNSS technology, the fertilizer application was driven by hydraulic system, double-disc opener opened a ditch to realize deep fertilizing, closed-loop PID control system was used to control motor speed and realize real-time rotation rate adjustment to achieve accurately control fertilizer amount. Field experiments were conducted to examine the performance of applicator, results indicated that: when the fertilizer amount was preseted to be 200 kg/hm2, tractor speed at 5 km/h, the row-following deviation within ±6 cm, the dynamic deviation of fertilizer amount deviation within 9%, which met the practical demand; compared with broadcasting application by fertilizer distributor, the amount of nitrogen was decreased by 25 kg/hm2, grain yield was increased by 486.5 kg/hm2. The applicator could achieve precise deep topdressing fertilization for wheat and be equipped for precision agriculture. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Nitrogen fertilizers

Controlled terms: Applicators? - ?Hydraulic equipment? - ?Hydraulic machinery? - ?Navigation systems? - ?Three term control systems? - ?Tractors (truck)

Uncontrolled terms: Autonomous navigation? - ?Autonomous navigation systems? - ?Broadcasting applications? - ?Fertilizer applications? - ?Nitrogen-use efficiency? - ?Precise fertilization? - ?Row following? - ?Wheat

Classification code: 601 Mechanical Design

Mechanical Design

? - ?632.2 Hydraulic Equipment and Machinery

Hydraulic Equipment and Machinery

? - ?663.1 Heavy Duty Motor Vehicles

Heavy Duty Motor Vehicles

? - ?731.1 Control Systems

Control Systems

? - ?804 Chemical Products Generally

Chemical Products Generally

Numerical data indexing: Percentage 9.00e+00%, Velocity 1.39e+00m/s

DOI: 10.6041/j.issn.1000-1298.2018.04.007

Compendex references: YES

Database: Compendex

 

      

21. Analysis and Experiment on Selective Harvesting Mechanical End-effector of White Asparagus

Accession number: 20182605375682

Authors: Liu, Xuemei (1, 2); Du, Shuai (1); Yuan, Jin (1, 2); Li, Yang (1, 2); Zou, Liangliang (1, 2)

Author affiliation: (1) School of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment, Tai’an; 271018, China

Corresponding author: Li, Yang(mtlyab@sdau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 110-120

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to achieve high efficiency and low damage recovery of white asparagus, an end effector was designed for selective harvesting of white asparagus, and a calculation method of driving force was derived. In order to drive the end effector to complete the action of earth, shear, clamping and pulling, the control parameters such as driving force, shear force and clamping force must be described quantitatively. Firstly, aiming at the problem of driving force, DEM simulation was used to establish the end-effector-soil discrete element model, the process of end-effector and soil was studied, and the driving force of end-effector was analyzed. Secondly, the shearing force of the end-effector was analyzed from the cutting of white asparagus and soil. The interaction model of white asparagus-end-effector-soil was established by universal testing machine and DEM. The shearing strength of white asparagus was determined by means of universal testing machine. And the shearing force of cutting the soil was determined from the DEM simulation, and the range of shearing force parameters of end-effector was determined. Thirdly, the process of the end-effector holding the white asparagus was simulated by the universal testing machine. And the compressive strength of white asparagus was determined, and the clamping force required by the end-effector in the soil was analyzed from the DEM simulation, and the range of the clamping force parameters of the end-effector was determined. Finally, the parameters range of the driving force FRT>195 N, the shear force FJQ>1.8 N, and the clamping force FJC ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: End effectors

Controlled terms: Clamping devices? - ?Compressive strength? - ?Finite difference method? - ?Harvesting? - ?Materials testing apparatus? - ?Recovery? - ?Shearing? - ?Shearing machines? - ?Soil testing? - ?Soils

Uncontrolled terms: Control parameters? - ?Discrete element modeling? - ?High-efficiency? - ?Interaction model? - ?Selective harvesting? - ?Shearing strength? - ?Shearing tests? - ?Universal testing machines

Classification code: 483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?603.1 Machine Tools, General

Machine Tools, General

? - ?604.1 Metal Cutting

Metal Cutting

? - ?731.5 Robotics

Robotics

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?921.6 Numerical Methods

Numerical Methods

Numerical data indexing: Force 1.10e+01N, Force 2.00e+02N, Percentage 3.00e+00%, Percentage 9.90e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.013

Compendex references: YES

Database: Compendex

 

      

22. Design and Test of Hydraulic Proportional Flow Valve for Hydraulic Chassis in Tractor

Accession number: 20182605375716

Authors: Li, Mingsheng (1); Ye, Jin (1); Xie, Bin (2); Yang, Shi (1); Zeng, Baigong (1); Liu, Jian (1)

Author affiliation: (1) College of Engineering and Technology, Southwest University, Chongqing; 400700, China; (2) College of Engineering, China Agricultural University, Beijing; 100083, China

Corresponding author: Ye, Jin(yejin2007@gmail.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 397-403

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to improve the speed stability of the hydraulic drive tractor and the ride comfort at low speed, a hydraulic proportional flow valve was designed. Pressure compensation function was used to eliminate the iMPact of pressure fluctuations on the flow. The structural parameters of the valve were designed by the method of traditional calculation and simulation. The simulation results showed that the flow rate range was 0~5.67×10-3m3/s and the flow rate was changed smoothly with the change of control pressure; the flow rate control pressure zone accounted for 68.4% of the total control pressure range; the range of the compensation pressure was 0.3~0.7 MPa. The test results showed that the flow rate control pressure zone accounted for 45% of the total control pressure range when tractor was no-load and at idle engine speed; the flow rate control pressure zone accounted for 62% of the total control pressure range when tractor was no-load and at high engine speed; the flow rate control pressure zone accounted for 49.5% of the total control pressure range when tractor was high-duty and at idle engine speed; the flow rate control pressure zone accounted for 48.5% of the total control pressure range when tractor was high-duty and at high engine speed; the flow rate of the valve was stabilized at 8.33×10-5m3/s when the control pressure was set to be 0.78 MPa and it was stabilized at 2.5×10-4m3/s when the control pressure was set to be 0.84 MPa. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 20

Main heading: Automobile testing

Controlled terms: Engines? - ?Flow rate? - ?Hydraulic drives? - ?Speed? - ?Testing? - ?Tractors (agricultural)? - ?Tractors (truck)

Uncontrolled terms: Control pressure? - ?Design and tests? - ?Flow rate control? - ?Flow valves? - ?Pressure compensation? - ?Pressure fluctuation? - ?Structural parameter? - ?Throttle

Classification code: 602.1 Mechanical Drives

Mechanical Drives

? - ?631 Fluid Flow

Fluid Flow

? - ?662 Automobiles and Smaller Vehicles

Automobiles and Smaller Vehicles

? - ?663.1 Heavy Duty Motor Vehicles

Heavy Duty Motor Vehicles

Numerical data indexing: Percentage 4.50e+01%, Percentage 4.85e+01%, Percentage 4.95e+01%, Percentage 6.20e+01%, Percentage 6.84e+01%, Pressure 3.00e+05Pa to 7.00e+05Pa, Pressure 7.80e+05Pa, Pressure 8.40e+05Pa

DOI: 10.6041/j.issn.1000-1298.2018.04.047

Compendex references: YES

Database: Compendex

 

      

23. Analysis and Experiment on Atomization Characteristics and Spray Deposition of Electrostatic Nozzle

Accession number: 20182605375684

Authors: Lan, Yubin (1, 2); Zhang, Haiyan (1, 2); Wen, Sheng (1, 2); Li, Shenghua (1)

Author affiliation: (1) College of Engineering, South China Agricultural University, Guangzhou; 510642, China; (2) National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology, Guangzhou; 510642, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 130-139

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Electrostatic charging of sprayed pesticide was realized in electrostatic spray nozzle design, which improved plant coverage and reduced wasted pesticide as well as soil pollution. The performance of electrostatic spray nozzles depended on the charge to mass rate of droplets. The preface illustrated six factors that can impact on the efficiency of the induction nozzle and the electrostatic spraying agricultural application, including nozzle geometry, nozzle air pressure, nozzle flow rate, applied voltage, electrode geometry, electrode position and materials, the properties of the sprayed liquid used and environment factors around the spray. In order to study the effect of electrode material on atomization characteristics and charge performance of electrostatic nozzle, optimize the spray parameters and explore the influence of electrostatic force on spray deposition, four experimental variables were designed, including the electrode material, electrode voltage, spray pressure and hole diameter of electrostatic nozzle, and the indoor atomization and deposition test were carried out. The results showed that the optimal electrode voltage was 8 kV, the optimal electrode material was copper and the optimal spray pressure was 1.7×105Pa. Compared with non-electrostatic spraying, the spray swath width of electrostatic nozzle was increased by 50 cm. Of all droplets, the electrostatic force had the most effect on the droplets (between 50 μm and 120 μm), making the deposition amount double. And the spray droplet density was decreased as the droplet size was increased over 120 μm. The size of the most droplets deposited on target was under 180 μm. Therefore, those electrostatic nozzles designed were suitable for crops whose optimum biological size was 180 μm or under 180 μm. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 29

Main heading: Spray nozzles

Controlled terms: Atomization? - ?Deposits? - ?Drops? - ?Electrodes? - ?Electrostatic devices? - ?Electrostatic force? - ?Nozzle design? - ?Pesticides? - ?Soil pollution? - ?Soil testing

Uncontrolled terms: Atomization characteristics? - ?Electrode geometries? - ?Electrode material? - ?Electrostatic charging? - ?Electrostatic nozzles? - ?Electrostatic spraying? - ?Environment factors? - ?Operating parameters

Classification code: 483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?631.1 Fluid Flow, General

Fluid Flow, General

? - ?701.1 Electricity: Basic Concepts and Phenomena

Electricity: Basic Concepts and Phenomena

? - ?802.3 Chemical Operations

Chemical Operations

? - ?803 Chemical Agents and Basic Industrial Chemicals

Chemical Agents and Basic Industrial Chemicals

Numerical data indexing: Size 1.20e-04m, Size 1.80e-04m, Size 5.00e-01m, Size 5.00e-05m to 1.20e-04m, Voltage 8.00e+03V

DOI: 10.6041/j.issn.1000-1298.2018.04.015

Compendex references: YES

Database: Compendex

 

      

24. Investigation on Low Frequency Pulsating and Draft Tube Vortex of Tubular Turbine

Accession number: 20182605375688

Authors: Zheng, Yuan (1); Jiang, Wenqing (2); Chen, Yujie (3); Sun, Aoran (3)

Author affiliation: (1) Institute of Innovation, Hohai University, Nanjing; 210098, China; (2) College of Energy and Electric Engineering, Hohai University, Nanjing; 211100, China; (3) College of Water Conservancy and Hydropower, Hohai University, Nanjing; 210098, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 165-171

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In order to study the characteristics of low frequency pressure pulsation of tubular turbine, the unsteady internal flow field in a tubular turbine of a power station was numerically simulated. The pressure pulsation characteristics of the turbine under different working conditions were also analyzed. The UG software was used to build the model which mainly consisted of inlet conduit, bulb body, guide vane, runner and draft tube. The results showed that the pressure pulsation in the turbine was mainly affected by the rotation frequency of blade (5.26 Hz) and the low-frequency pressure-pulse (0.20 Hz) under the rated condition and low flow rate condition. The amplitude of the low frequency pulsation at 0.20 Hz was increased gradually from the turbine inlet to the outlet. And the amplitude under the low flow rate condition was higher than that of the rated condition. There was a helical vortex rope in the draft tube which had the same direction with the runner hand of rotation. The frequency of the vortex rope in the draft tube was 0.22 Hz. The low frequency pressure fluctuation frequency was mainly caused by the vortex rope. In order to reduce the influence of vortex rope, the deflector was used in the draft tube. The vortex was eliminated by reducing the energy of vortex. The steady operation of the turbine has been the focus in recent years. At the same time, the low-frequency pressure-pulse in the turbine was an important factor which affected the stable operation of the turbine. The research result had reference value for the stable operation of tubular turbine. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Turbomachine blades

Controlled terms: Tubes (components)? - ?Tubular turbines? - ?Vortex flow

Uncontrolled terms: Draft tubes? - ?Internal flow field? - ?Low frequency pressure? - ?Low-frequency pressure pulsations? - ?Low-frequency pulsations? - ?Numerical calculation? - ?Rotation frequencies? - ?Vortex characteristics

Classification code: 617.3 Steam Engines

Steam Engines

? - ?619.1 Pipe, Piping and Pipelines

Pipe, Piping and Pipelines

? - ?631.1 Fluid Flow, General

Fluid Flow, General

Numerical data indexing: Frequency 2.00e-01Hz, Frequency 2.20e-01Hz, Frequency 5.26e+00Hz

DOI: 10.6041/j.issn.1000-1298.2018.04.019

Compendex references: YES

Database: Compendex

 

      

25. Potato Processing Quality Characteristics Prediction Based on Multivariate Nonlinear Regression Analysis

Accession number: 20182605375712

Authors: Xu, Yingchao (1); Wang, Xiangyou (1); Yin, Xiang (1); Yue, Rencai (1); Hu, Zhouxun (1); Sun, Jingbin (1)

Author affiliation: (1) School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo; 255049, China

Corresponding author: Wang, Xiangyou(wxy@sdut.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 366-373

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aimming to accurately detect potato processing quality, the distribution of processing quality index dry matter and reducing sugar in potato were investigated. It was concluded that potato dry matter had the ellipsoid distribution in potato and the minimum value was in the center part. The experimental data was analyzed by using quasi-Newton algorithm combined with universal global optimization method, and the regression model of dry matter content of Xisen 3 and Xisen 6 potato about testing point coordinates x, y, and z was received. The determination coefficients of regression models about dry matter content of Xisen 3 and Xisen 6 potato were 0.909 9 and 0.912 3, respectively, and regression models can effectively predict the potato dry matter content. The content of reducing sugar in the center of potato was the highest, and the reducing sugar content from the center to the epidermis was decreasing. The reducing sugar content in the stem of potato was lower than that on the top of potato. The determination coefficients of multivariate nonlinear regression models about two kinds of potato reducing sugar content were 0.833 6 and 0.824 6, respectively. The regression models could predict the contents of reducing sugar in potato. According to the analysis of experimental data, the potato close to the epidermis was higher in dry matter and lower in reducing sugar, which was suitable for processing potato chips and French fries. The average content of dry matter of Xisen 6 potato is more than 20%, and the average content of reducing sugar is less than 0.1%, which is suitable for processing. This research can help processors for effective utilization of potato for various types of processing products viz., chips, French fries and flour, and provide a theoretical basis for NIR nondestructive detection of potato processing quality. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Regression analysis

Controlled terms: Forecasting? - ?Global optimization? - ?Nonlinear analysis? - ?Quality control

Uncontrolled terms: Dry matters? - ?Multivariate non-linear regression? - ?Potato? - ?Processing quality? - ?Reducing sugars

Classification code: 913.3 Quality Assurance and Control

Quality Assurance and Control

? - ?921.5 Optimization Techniques

Optimization Techniques

? - ?922.2 Mathematical Statistics

Mathematical Statistics

Numerical data indexing: Percentage 1.00e-01%, Percentage 2.00e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.043

Compendex references: YES

Database: Compendex

 

      

26. Effect of Soil Freeze on Flow Velocity in Loess Rills

Accession number: 20182605375701

Authors: Chen, Liyan (1); Lei, Tingwu (1); Ban, Yunyun (1); Gao, Yuan (1)

Author affiliation: (1) College of Water Resources and Civil Engineering, China Agricultural University, 100083, China

Corresponding author: Lei, Tingwu(leitingwu@cau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 282-289 and 191

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Water flow velocity along an eroding rill over frozen and non-frozen slopes is of great importance for understanding rill erosion hydrodynamics, which is closely related to erosion of freeze thaw soils and sediment transport. A series of flume experiments were conducted with loess soil from Ansai, Shaanxi Province. Flow velocities were measured in a stainless steel flume which was 8 m long, 0.1 m wide, and 0.12 m high. The experiments involved five slope gradients (5°, 10°, 15° and 20°), four flow rates (1 L/min, 2 L/min, 4 L/min and 8 L/min), with three replicates. Time intervals for water flow running from the top of the flume to the bottom end, covering a total length of 8 m was measured to calculate the velocities under different slopes and different flow rates, for both frozen soil and non-frozen soil slopes. The peak velocities were also gained by the data of conductivity changed with time by the electrolyte tracer method during the experiment. The leading edge velocities over frozen soil were between 0.260 m/s and 0.843 m/s and that of non-frozen were between 0.175 m/s and 0.552 m/s. Leading edge velocities over frozen soil and non-frozen soil were both increased with the increase of slope gradients and flow rate, the increasing rate of leading edge velocity was decreased with the increase of slope gradient or flow rate under gentle slope(5°~10°, 10°~15°) and low flow rate(1 L/min, 2 L/min and 4 L/min). Over frozen and non-frozen soils, the velocity was increased faster on gentle slopes than that on steep slopes and under low flow rate than that under high flow rate. The power function fitted the leading edge velocity very well for all the experimental conditions over frozen and non-frozen soils. The slope and the flow rate had greater effect on velocity over frozen soil slopes than over non-frozen soil. The result demonstrated that leading edge velocities and peak velocities over frozen soil were faster than that of non-frozen soil under all slopes and flowrates, the ratio of flow velocities over frozen soil and non-frozen soil was 1.43 and 1.40. The ratio of peak velocities and leading edge velocities over frozen and non-frozen slopes were 0.61 and 0.63. The experiment showed that the method for flow velocity measurement was reasonable, and it can also be widely used. The results can provide a data set for flow dynamics research over frozen soil and non-frozen soil. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 41

Main heading: Frozen soils

Controlled terms: Electrolytes? - ?Erosion? - ?Flow of water? - ?Flow rate? - ?Flow velocity? - ?Hydraulics? - ?Sediment transport? - ?Soil mechanics? - ?Velocity

Uncontrolled terms: Different slopes? - ?Experimental conditions? - ?Flume experiment? - ?Loess soils? - ?Peak velocities? - ?Sheetflows? - ?Soils and sediments? - ?Tracer methods

Classification code: 483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?631 Fluid Flow

Fluid Flow

? - ?631.1.1 Liquid Dynamics

Liquid Dynamics

? - ?632.1 Hydraulics

Hydraulics

? - ?702 Electric Batteries and Fuel Cells

Electric Batteries and Fuel Cells

? - ?803 Chemical Agents and Basic Industrial Chemicals

Chemical Agents and Basic Industrial Chemicals

? - ?804 Chemical Products Generally

Chemical Products Generally

Numerical data indexing: Size 1.00e-01m, Size 1.20e-01m, Size 8.00e+00m, Velocity 1.75e-01m/s to 5.52e-01m/s, Velocity 2.60e-01m/s to 8.43e-01m/s

DOI: 10.6041/j.issn.1000-1298.2018.04.032

Compendex references: YES

Database: Compendex

 

      

27. Multi-features Identification Method of Electronic Nose Data Based on KECA+FDA for Chinese Liquors

Accession number: 20182605375713

Authors: Yin, Yong (1); Shen, Xiaopeng (1); Yu, Huichun (1)

Author affiliation: (1) College of Food and Bioengineering, Henan University of Science and Technology, Luoyang; 471023, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 374-380

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The identification of six kinds of Chinese spirits, including similar quality using electronic nose is a complex and difficult work. In order to enhance the correct identification rate of six kinds of Chinese liquors using electronic nose (E-nose), a Fisher discriminant analysis (FDA) method based on kernel entropy component analysis (KECA) was introduced. Based on this method, the influence of different features combination representation types of E-nose signals on the discrimination result of six kinds of Chinese liquors was studied in-depth. Firstly, integral value (INV), variance (VAR), relative steady-state average value (RSAV), average differential value (ADV) and wavelet energy value (WEV) of E-nose signals were extracted as five kinds of feature values, and the FDA result of each single feature showed that the identification result based on INV, AVRS and WEV was superior to that of the other two features, respectively. Thus the features INV, AVRS and WEV were selected as subsequent analysis features. Then, for the features of INV, AVRS and WEV, when the E-nose signals were represented by random combinations based on two features or three features combination, FDA results displayed that the identification results of multi-features combinations were better than that of single feature, especially the three features combination was the best. Finally, on the premise of combining the three features to represent electronic nose signals, and the discrimination result of six kinds of Chinese liquors was deeply investigated by an introduced KECA+FDA. When the radial basis function (RBF) was selected as kernel transform function, with the help of a measuring method of matrix similarity based on Euclidean distance, the characteristic parameter of RBF was defined, which was 16.860 8. And the correct identification rate of the test set samples was from 79.92% of FDA up to 100% of the KECA+FDA. Meanwhile, the discrimination result of KECA+FDA was better than that of BP neural network and support vector machine. This indicated that the KECA+FDA method can effectively improve the identification ability of the six kinds of Chinese liquors; at the same time, it also provided a feasible pattern recognition method for the identification of complex samples such as Chinese liquors by electronic nose in the future. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 25

Main heading: Electronic nose

Controlled terms: Complex networks? - ?Discriminant analysis? - ?Entropy? - ?Fisher information matrix? - ?Pattern recognition? - ?Radial basis function networks

Uncontrolled terms: Chinese liquors? - ?Component analysis? - ?Electronic nose (e-nose)? - ?Fisher discriminant analysis? - ?Identification rates? - ?Multi features? - ?Pattern recognition method? - ?Radial Basis Function(RBF)

Classification code: 641.1 Thermodynamics

Thermodynamics

? - ?722 Computer Systems and Equipment

Computer Systems and Equipment

? - ?801 Chemistry

Chemistry

? - ?922 Statistical Methods

Statistical Methods

Numerical data indexing: Percentage 1.00e+02%, Percentage 7.99e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.044

Compendex references: YES

Database: Compendex

 

      

28. Segmentation Method of Terraced Fields Based on Image and Gradient Data

Accession number: 20182605375697

Authors: Zhang, Hongming (1); Hu, Yong (1); Yang, Qinke (2); Yang, Jiangtao (3); Wang, Meili (1); Zhang, Jiong (4)

Author affiliation: (1) College of Information Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) College of Urbanology and Resource Science, Northwest University, Xi’an; 710069, China; (3) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (4) Institute of Neuroimaging and Informatics, University of Southern California, Los Angeles; CA; 90033, United States

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 249-256

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Terraced fields are a kind of soil and water conservation measures explored by humans on sloping fields. The construction of terraces largely develops the agricultural growth potential of sloping arable land, which has the functions of water storage and soil conservation. Due to the difficulty in obtaining information such as the number of terraces and distribution of area, it is difficult to carry out the quantitative research on the terraced fields. With the continuous development of unmanned aerial vehicle (UAV) technology, it becomes possible to access high-precision terrain information. Based on the UAV orthorectified images and slope data calculated by digital elevation model (DEM), the rough contour of terraced fields was extracted by Canny edge detection operator, and the false edges of terraced fields were removed according to the structural characteristics of terraced fields. According to edge strength superposition and edge connection operation, the terraces were divided by region growing algorithm. The method effectively solved the problems of uneven terraced fields in the hilly areas, interference of the surface sediments and complicated spectral characteristics of the images. Compared with the field data of terraced plots marked by hand, the results showed that the total accuracy of the proposed algorithm in terraced fields can reach 84.9%. The research result can provide a solution for the rapid mapping of terraced fields. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 30

Main heading: Water conservation

Controlled terms: Agriculture? - ?Aircraft detection? - ?Antennas? - ?Digital instruments? - ?Digital storage? - ?Edge detection? - ?Geomorphology? - ?Image segmentation? - ?Soil conservation? - ?Surveying ? - ?Unmanned aerial vehicles (UAV)

Uncontrolled terms: Continuous development? - ?Digital elevation model? - ?Region growing algorithm? - ?Slope? - ?Soil and water conservation measures? - ?Spectral characteristics? - ?Structural characteristics? - ?Terraced fields

Classification code: 405.3 Surveying

Surveying

? - ?444 Water Resources

Water Resources

? - ?481.1.1 Geomorphology

Geomorphology

? - ?483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?652.1 Aircraft, General

Aircraft, General

? - ?716.2 Radar Systems and Equipment

Radar Systems and Equipment

? - ?722.1 Data Storage, Equipment and Techniques

Data Storage, Equipment and Techniques

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

Agricultural Equipment and Methods; Vegetation and Pest Control

Numerical data indexing: Percentage 8.49e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.028

Compendex references: YES

Database: Compendex

 

      

29. Optimization Design and Experiment of Transplanting Mechanism of Rice Pot Seedling on Film

Accession number: 20182605375679

Authors: Zhao, Yun (1); Liu, Zhiping (1); Xin, Liang (1); Zhou, Maile (1); Wang, Jie (1)

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

Corresponding author: Xin, Liang(xinliang@neau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 87-93

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The technique of planting on film can effectively prevent soil and water loss, which is beneficial to the planting of organic rice. The pot seedling transplanting has the advantages of non-hurting root and no need of recovering period, so it can extend the crop growing period, increase and bring forward the effective tillering, which is very important to the food security. In order to realize the combination of two kinds of agronomy, a new type of transplanting mechanism was designed, in which the hole was perforated on film and the rice pot seedling was planted, it was effective to avoid the damage of seedling caused by the unsynchronization of film breaking and rice planting. The working principle of rice pot seedling transplanting mechanism was introduced, kinematic analysis model of mechanism was established, a computer aided analysis and optimization software of the transplanting mechanism was developed, and a set of structural parameters was obtained to meet the requirement of transplanting on film. Three-dimensional model was built, and input to ADAMS software to conduct virtual kinematic simulation analysis. The physical prototype of the transplanting mechanism was developed to conduct kinematic tests with high-speed photography technology on the test-bed. The result of bench test was basically consistent with the track obtained from the theoretical analysis, which showed the correctness of the design of transplanting mechanism. The seedling picking and the planting on film were completed on the test bench, the success rate of seedling picking-up was 92.8%, and the qualification rate of transplanting on film was 90%, which met the operation requirement of transplanting on film and showed the feasibility of performance of transplanting mechanism of rice pot seedling on film. The study provided useful reference for the related design and had an important significance. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 15

Main heading: High speed photography

Controlled terms: Computer aided analysis? - ?Computer software? - ?Cultivation? - ?Experiments? - ?Food supply? - ?Kinematics

Uncontrolled terms: Kinematic simulations? - ?Optimization design? - ?Optimization software? - ?Rice pot seedling? - ?Seedling transplanting? - ?Structural parameter? - ?Three-dimensional model? - ?Transplanting mechanisms

Classification code: 723 Computer Software, Data Handling and Applications

Computer Software, Data Handling and Applications

? - ?723.5 Computer Applications

Computer Applications

? - ?742.1 Photography

Photography

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?822.3 Food Products

Food Products

? - ?901.3 Engineering Research

Engineering Research

? - ?931.1 Mechanics

Mechanics

Numerical data indexing: Percentage 9.00e+01%, Percentage 9.28e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.010

Compendex references: YES

Database: Compendex

 

      

30. Preparation Technology and Complexing Properties of 6-Carboxy Chitooligosaccharides Chelate Calcium (CCOS-Ca(II))

Accession number: 20182605375714

Authors: Hu, Xuefang (1, 2); Tian, Zhiqing (1, 2); Liang, Liang (1, 2); Zhang, Zhimin (1, 2); Wang, Shikui (1, 2)

Author affiliation: (1) Chinese Academy of Agricultural Engineering, Beijing; 100125, China; (2) Key Laboratory of Agro-products Postharvest Handling, Ministry of Agriculture, Beijing; 100121, China

Corresponding author: Wang, Shikui(wosk1963@sohu.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 381-388

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The chelating ability of chitosan derivative 6-carboxy-chitooligosaccharide (CCOS) to calcium ions was studied, and the preparation technology of 6-carboxyl chitosan chelated calcium (CCOS-Ca (II)) was established, to provide new ideas for the development of chitooligosaccharide-based metal complexes and high-performance calcium supplement. Chitooligosaccharides (COS) was used as experimental materials to prepare CCOS by oxidation of hydroxymethyl groups at the C6 position of chitooligosaccharides into carboxyl groups by TEMPO oxidation. Using CaCl2as the calcium source, through the discussion of pH value, reaction temperature, reaction time, CCOS and CaCl2mass ratio on CCOS-Ca (II) rate were studied, using three factors and five levels central composite rotatable design to optimize the preparation process. The products were analyzed by Fourier transform infrared spectrum scanning (FT-IR) and elemental analysis (EA). Regression analysis of response surface test data was carried out by using Design-Expert software. The optimum process parameters for CCOS-Ca (II) preparation were as follows: the pH value was 8.3, the reaction time was 60 min, the reaction temperature was 50, and the mass ratio of CCOS to CaCl2was 34. Under the optimized conditions, the chelating rate was 88.86%. The structure of CCOS-Ca (II) complex was confirmed by IR and EA analysis, and the molar ratio of CCOS to Ca2+was 2:6;1. The CCOS molecule contained -OH, -NH2and -COOH, which can effectively chelate calcium. The effect of pH value, reaction temperature and ligand mass ratio on the chelation results was significant. CCOS-Ca (II) complex can not only play the unique biological activity of chitooligosaccharides, but also may play a synergistic effect, enhance both the chitooligosaccharides and Ca2+biological activity, and it was expected to prepare new calcium supplements. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 28

Main heading: Chlorine compounds

Controlled terms: Bioactivity? - ?Chelation? - ?Chemical analysis? - ?Chitosan? - ?Metal complexes? - ?pH? - ?Regression analysis? - ?Software testing

Uncontrolled terms: Central composite rotatable design? - ?Chitooligosaccharides? - ?Chitosan derivatives? - ?Complexing properties? - ?Experimental materials? - ?Fourier transform infrared spectra? - ?Infrared characterization? - ?Preparation technology

Classification code: 461.6 Medicine and Pharmacology

Medicine and Pharmacology

? - ?723.5 Computer Applications

Computer Applications

? - ?801.1 Chemistry, General

Chemistry, General

? - ?802.2 Chemical Reactions

Chemical Reactions

? - ?804.1 Organic Compounds

Organic Compounds

? - ?804.2 Inorganic Compounds

Inorganic Compounds

? - ?922.2 Mathematical Statistics

Mathematical Statistics

Numerical data indexing: Percentage 8.89e+01%, Time 3.60e+03s

DOI: 10.6041/j.issn.1000-1298.2018.04.045

Compendex references: YES

Database: Compendex

 

      

31. Calibration of Discrete Element Model Parameters for Pellet Feed Based on Injected Section Method

Accession number: 20182605375685

Authors: Peng, Fei (1); Wang, Hongying (2); Fang, Fang (3); Liu, Yude (1)

Author affiliation: (1) School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing; 100048, China; (2) College of Engineering, China Agricultural University, Beijing; 100083, China; (3) College of Chemistry and Energy, Zhengzhou University, Zhengzhou; 450001, China

Corresponding author: Wang, Hongying(hongyingw@cau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 140-147

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: In the process of discrete element numerical calculation, such as post spraying, cooling, transportation, storage, feeding and so on, the establishment of particle model is an important factor to affect the accuracy of simulation. The discrete element parameters were calibrated by measuring the angle of repose. The apparatus and method used for determining the angle of repose existed a few problems, such as more sample consumption and cumbersome measurement. Therefore, calibration work for particle parameters was essential. A new apparatus and method were proposed for actively simulation and determination by the cross-sectional profile of particles’ accumulation. The discrete element model similar to pellet feed was established based on the template plate in the software EDEM and Pro/E. The sliding friction coefficient X1, restitution coefficient X2, and rolling friction coefficient X3were selected as the influencing factors, and the accumulation angle of repose was selected as evaluating indicators, thus the performance optimization experiments were carried out under the quadratic orthogonal rotation design. Based on the software regression analysis of Design-Expert 8.0.6 and response surface analysis method, the relationship between the three influencing factors and evaluating indicator was established. The measured value of repose angle for pellet feed was selected as the chosen target; by using response surface method, the optimal aggregative index could be obtained under the condition that the sliding friction coefficient among pellet feed was 0.41, restitution coefficient was 0.53, and rolling friction coefficient was 0.08. In the end, the discrete element method combined with the apparatus based on injected section method were verified in the test trail. Under the same condition with simulation, the predicted value for angle of repose was 29.43°±0.70°. Under this scheme, field test result showed that the angle of repose for pellet feed was 28.55°±0.37°. In comparison with simulation value, the error of the angle of repose was 3.1%, which showed that the modeling method of pellet feed and the apparatus based on injected section used for determining the angle of repose were validated and available. The research showed that the optimal parameter combination could be used as reference value when selecting the simulation parameters of pellet feed in the DEM simulation. Meanwhile, the parameters calibration method based on the injected section method was feasible, which could provide references for the numerical determination of other agricultural particulate materials. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 23

Main heading: Numerical methods

Controlled terms: Calibration? - ?Experiments? - ?Finite difference method? - ?Friction? - ?Pelletizing? - ?Regression analysis? - ?Surface analysis? - ?Surface properties? - ?Tribology

Uncontrolled terms: Angle of repose? - ?Discrete element modeling? - ?Injected section method? - ?Optimal parameter combinations? - ?Performance optimizations? - ?Quadratic orthogonal rotation? - ?Response surface analysis methods? - ?Sliding friction coefficient

Classification code: 901.3 Engineering Research

Engineering Research

? - ?921.6 Numerical Methods

Numerical Methods

? - ?922.2 Mathematical Statistics

Mathematical Statistics

? - ?931 Classical Physics; Quantum Theory; Relativity

Classical Physics; Quantum Theory; Relativity

? - ?951 Materials Science

Materials Science

Numerical data indexing: Percentage 3.10e+00%

DOI: 10.6041/j.issn.1000-1298.2018.04.016

Compendex references: YES

Database: Compendex

 

      

32. Simulation and Optimum Design on Airflow Distribution Chamber of Pneumatic Forming Machine for Rice Seeding-growing Tray

Accession number: 20182605375680

Authors: Li, Hailiang (1); Wang, Chun (1, 2); Hu, Jun (1); Yu, Haiming (1); Li, Qingda (1); Zhang, Xinyue (1)

Author affiliation: (1) Key Laboratory of Agricultural Mechanization Engineering, Heilongjiang Bayi Agricultural University, Daqing; 163319, China; (2) South Subtropical Crops Research Institute, Chinese Academy of Tropical Agriculture Sciences, Zhanjiang; 524000, China

Corresponding author: Wang, Chun(wangchun1963@126.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 94-101

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: It has been widely recognized that rice seedlings made from biomass such as crop straw and wood chips can reduce white pollution, realize resource utilization and raise seedling quality. At present, biomass forming mainly adopts compression molding, which has problems such as high energy consumption, low productivity and poor molding quality. The problems mentioned are solved effectively by pneumatic method. The object was to optimize the airflow distribution chamber of pneumatic forming machine and improve the production quality of rice seeding-growing tray. The reasonable air distribution chamber structure was precondition for normal operation of pneumatic forming machine for rice seeding-growing tray. Based on the gas control equation, fluent software FLUENT was used to simulate the air flow field to ensure a uniform flow field structure in the airflow distribution chamber, and produce qualified rice seeding-growing tray. Combined with orthogonal test design and numerical simulation technology, the single factor and orthogonal simulation test of airflow field were carried out with thickness of the cavity, vent diameter, base angle of cavity as experimental factors and speed unevenness coefficient as assessment consumption. The experimental results showed that the best parameters in combination were as follows: cavity thickness of the airflow distribution was 110 mm, vent diameter was 15 mm, base angle of cavity was 0°, vent air velocity was within the range of 0.09~0.14 m/s, nonuniform coefficien was 11.37%, flow velocity was stability, and distribution was uniform in airflow distribution chamber. The mean relative error between the simulation results and the measured results was 1.59%, bilateral correlation coefficient was 0.028, and there was a significant correlation. The forming rate of rice seeding-growing tray was 92.3%, the variation coefficient of hole weight and under surface thickness was 10.2% and 9.81%, respectively, which met the production requirement. The research result was of great significance to improve the molding quality and molding efficiency of the pneumatic forming machine, which can provide reference for the optimization design of similar structure moulds. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 27

Main heading: Air

Controlled terms: Compression molding? - ?Energy utilization? - ?Flow fields? - ?Flow velocity? - ?High energy forming? - ?Metal forming machines? - ?Pneumatics? - ?Structural optimization? - ?Vents? - ?Wood products

Uncontrolled terms: Air flow fields? - ?Airflow distribution? - ?Correlation coefficient? - ?Forming machine? - ?High energy consumption? - ?Production requirements? - ?Simulation technologies? - ?Structure optimization

Classification code: 525.3 Energy Utilization

Energy Utilization

? - ?535.2 Metal Forming

Metal Forming

? - ?535.2.1 Metal Forming Machines

Metal Forming Machines

? - ?631 Fluid Flow

Fluid Flow

? - ?631.1 Fluid Flow, General

Fluid Flow, General

? - ?632.3 Pneumatics

Pneumatics

? - ?804 Chemical Products Generally

Chemical Products Generally

? - ?811.2 Wood and Wood Products

Wood and Wood Products

? - ?921.5 Optimization Techniques

Optimization Techniques

Numerical data indexing: Percentage 1.02e+01%, Percentage 1.14e+01%, Percentage 1.59e+00%, Percentage 9.23e+01%, Percentage 9.81e+00%, Size 1.10e-01m, Size 1.50e-02m, Velocity 9.00e-02m/s to 1.40e-01m/s

DOI: 10.6041/j.issn.1000-1298.2018.04.011

Compendex references: YES

Database: Compendex

 

      

33. Particle Filter Method Based on Multi-strategy Difference Cuckoo Search Algorithm

Accession number: 20182605375699

Authors: Huang, Chen (1); Fei, Jiyou (1, 2); Wang, Liying (2); Liu, Xiaodong (2)

Author affiliation: (1) College of Mechanical Engineering, Dalian Jiaotong University, Dalian; 116028, China; (2) College of EMU Application and Maintenance Engineering, Dalian Jiaotong University, Dalian; 116028, China

Corresponding author: Fei, Jiyou(fjy@djtu.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 265-272

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Cuckoo search algorithm (CS) is a valid bio-heuristic algorithm, which has been extensively applied to solve the optimal problem in actual engineering projects, due to the advantages of simplicity, few parameters and easy implementation. In order to improve the population diversity and global search efficiency of the standard CS algorithm, the different mutation processes of an improved difference evolution algorithm was introduced into the cuckoo algorithm. In the different mutation processes, the multi-strategy associated with random walks method of the CS algorithm was used to optimize the host discovery process. With the multi-strategy difference mutation operation, the diversity of the cuckoo population was improved in the process of the cuckoo searching. Meanwhile, in the improved cuckoo searching, the queue optimization mechanism was added to the new solution selection, combining with the greedy algorithm to reduce the attraction problem of the undesirable solution and speed up the search process. In addition, the improved cuckoo algorithm with multi-strategy different mutation processes was applied to particle filtering. The particles were characterized with the cuckoo nests, by simulating the process that the cuckoo groups searched the nests to optimize the particle distribution. The experiment result showed that the improved particle filter can improve the prediction accuracy of particle diversity and nonlinear system state, and it can keep a good robustness and stability in the case of the particle number decrease. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 28

Main heading: Evolutionary algorithms

Controlled terms: Bandpass filters? - ?Heuristic algorithms? - ?Learning algorithms? - ?Monte Carlo methods? - ?Optimization

Uncontrolled terms: Cuckoo search algorithms? - ?Evolution algorithms? - ?Greedy algorithms? - ?Improved particle filter? - ?Multi-strategy? - ?Particle distributions? - ?Particle filter? - ?Population diversity

Classification code: 703.2 Electric Filters

Electric Filters

? - ?723.1 Computer Programming

Computer Programming

? - ?921.5 Optimization Techniques

Optimization Techniques

? - ?922.2 Mathematical Statistics

Mathematical Statistics

DOI: 10.6041/j.issn.1000-1298.2018.04.030

Compendex references: YES

Database: Compendex

 

      

34. Potential of Cultivated Land Quality Based on Combination of Grading Factors and Matter Element Analysis

Accession number: 20182605375690

Authors: Zhao, Dongling (1); Lin, Shangwei (1); Yang, Jianyu (1, 2); Zhang, Chao (1, 2); He, Shanshan (1); Zhang, Tingting (1)

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: Yang, Jianyu(ycjyyang@cau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 181-191

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Calculation of cultivated land quality potential is an important content of land consolidation project. In order to scientifically calculate the quality of cultivated land remediation potential and arrangement of land consolidation project, based on the analysis of the influence factors of agricultural land classification and the establishment of a set of evaluation index system of land use coefficient, the potential of cultivated land quality was evaluated from two aspects of natural quality and utilization quality. Zhuozhou City of Hebei Province was taken as a case study for the method. After analyzing the previous achievement of agricultural land classification, by using the improved factor combination method and the three qualified convertible grading factors based on classification, eight types of convertible restriction factor combinations were found. The irrigation guarantee rate and soil organic matter content were determined as the limiting factors of cultivated land quality. According to the adaptability of each limiting factor, the lifting scheme was worked out. Then, in the second step, according to the actual situation of the study area, each index which was closely related to the level of land use was analyzed. The three factor layers, including the spatial pattern of cultivated land, the level of cultivated convenience, and the level of infrastructure in the field were included, which included the following eight indexes. Based on the analytic hierarchy process (AHP), the weights of each index were calculated, and the indexes were normalized to eliminate the dimension. Then the land use level of each grid and the difference of different utilization levels were calculated by the matter element analysis. Finally, with the study of existing land remediation engineering experience and technology of GIS or RS to enhance the level of each factor, and then the land use coefficient, the natural quality index and the utilization quality index were calculated, besides, the differences of natural quality index and utilization quality index were calculated before and after remediation, at the same time the result was analyzed. The result showed that both natural and utilized grade of the area can be improved after the implementation of land consolidation project. The average improvement value of provincial indices of natural and utilization levels were 174 and 167, respectively. The provincial natural quality grade was promoted by an average of 0.87, and the provincial utilized grade was improved by an average of 0.83. After converting the provincial grade into national grade, the national natural quality grade was improved by an average of 0.53, and the national utilized grade was improved by an average of 0.73. The new ideas and methods of prediction of cultivated land quality potential were explored. The results provided guidelines for the evaluation of cultivated land potential and the selection of index system, and provided the reference for quality evaluation of cultivated land. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 30

Main heading: Quality control

Controlled terms: Agriculture? - ?Analytic hierarchy process? - ?Factor analysis? - ?Grading? - ?Land use? - ?Quality assurance? - ?Remediation

Uncontrolled terms: Cultivated land qualities? - ?Land consolidations? - ?Matter-element analysis? - ?Reformed factor combination? - ?Zhuozhou City

Classification code: 403 Urban and Regional Planning and Development

Urban and Regional Planning and Development

? - ?454.2 Environmental Impact and Protection

Environmental Impact and Protection

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

Agricultural Equipment and Methods; Vegetation and Pest Control

? - ?913.3 Quality Assurance and Control

Quality Assurance and Control

? - ?922.2 Mathematical Statistics

Mathematical Statistics

? - ?961 Systems Science

Systems Science

DOI: 10.6041/j.issn.1000-1298.2018.04.021

Compendex references: YES

Database: Compendex

 

      

35. Multi-energy Domain Dynamic Full Solution Model and Experiment of Stewart Platform

Accession number: 20182605375717

Authors: Li, Yongquan (1, 2); Liu, Tianxu (1, 2); Wang, Lijie (1, 2); Zhang, Lijie (2, 3); Cheng, Xueli (4)

Author affiliation: (1) Parallel Robots and Mechatronic Systems Laboratory, Yanshan University, Qinhuangdao; 066004, China; (2) Key Laboratory of Advanced Forgingand Stamping Technology and Science, Ministry of Education, Yanshan University, Qinhuangdao; 066004, China; (3) Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao; 066004, China; (4) Department of Mechanical Engineering, Henan Institute of Technology, Xinxiang; 453002, China

Corresponding author: Zhang, Lijie(ljzhang@ysu.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 404-411

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Dynamic model of parallel mechanism is on the dynamics analysis, kinetic parameters optimization and the basis of the dynamic parameter identification, and the accurate dynamics model is the premise to realize its high speed and high precision control. The multi-energy domain dynamics modeling of six degrees of freedom Stewart parallel platform was studied. Firstly, the dynamic model of the Stewart platform driven by electric cylinder was established by using the screw bond graph, the equation of state was derived by using the traditional bond graph, the servo electric cylinder bond graph model was established, and the equation of state was derived, according to that, connecting the drive end to the mechanical body, and the whole solution of the dynamic model of multi-energy domain system would be obtained. Secondly, given the end trajectory of the platform, the drive displacement obtained by the reverse solution accorded with the requirement of trajectory planning on motion stability, the dynamic complete solution included the driving force and joint binding force was obtained by combining the state equation and comparing the theory calculation in Matlab, the simulation results in ADAMS and the real value of the driving force in experiment, the curve fitting degree was high which verified the correctness of the screw bond graph model. Finally, by means of driving force with theory calculate and the whole solution of the multi-energy domain dynamics model, the servo motor current was got, compared with the real value of the current, the correctness of the whole solution of multi-energy domain dynamics model would be verified. It laid a foundation for the identification of dynamic parameters and the research of platform control for the following parameters, including the inertial parameters and friction parameters of the drive unit. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Dynamics

Controlled terms: Curve fitting? - ?Cylinders (shapes)? - ?Degrees of freedom (mechanics)? - ?Dynamic models? - ?Equations of state? - ?Graph theory? - ?MATLAB? - ?Mechanisms? - ?Parameter estimation? - ?Screws ? - ?Simulators

Uncontrolled terms: Accurate dynamics model? - ?Bond graph? - ?High precision control? - ?Multi energy? - ?Parallel mechanisms? - ?Parameters optimization? - ?Six degrees of freedom? - ?Trajectory Planning

Classification code: 601.3 Mechanisms

Mechanisms

? - ?605 Small Tools and Hardware

Small Tools and Hardware

? - ?921 Mathematics

Mathematics

? - ?931.1 Mechanics

Mechanics

DOI: 10.6041/j.issn.1000-1298.2018.04.048

Compendex references: YES

Database: Compendex

 

      

36. Characteristic Analysis of Interior Hydrodynamic Noise in Jetting Centrifugal Pump

Accession number: 20182605375687

Authors: Guo, Rong (1); Li, Rennian (1, 2); Zhang, Renhui (1, 2); Song, Qice (1)

Author affiliation: (1) College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; (2) Key Laboratory of Fluid Machinery and Systems, Lanzhou; Gansu Province; 730050, China

Corresponding author: Li, Rennian(lirn@lut.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 156-164

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: To analyze contribution and characteristics of interior hydrodynamic noise of the jetting centrifugal pump (JCP), the numerical calculation and experiment were carried out. Unsteady numerical calculation under different conditions were performed by using large eddy simulation (LES) method, and pressure fluctuation on the surfaces of flowing-passed components was exported as the dipole source. The flow-borne noise induced by different components of the pump was predicted by acoustic finite element method (FEM). Considering the coupling effect of sound and vibration, the weak coupling model of flow field, structure field and sound field was established to predict flow-induced structure noise generated from structural vibration. To obtain time and frequency domain information of the hydrodynamic noise in the pump outlet, a test-bed with hydrophone was built. The results showed that the maximum error between numerical calculation and experiment was 4% at major characteristic frequency. The rotor-stator interaction between impeller and vane as well as the resonance of fluid and structure was important factors of the interior noise of JCP, reflecting the structural characteristics of the flowing-passed components had some influence on the interior noise. Flow-borne noise of stators was generally greater than flow-induced structure noise, which proved interior noise was mainly determined by the pressure fluctuation characteristics of fluid. Numerical calculation and test results showed that the shaft frequency (47.5 Hz) noise caused by the impeller had about 180 dB and played a dominant role in the hydrodynamic noise of JCP, which provided reference and basis for hydraulic design of the low noise JCP. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 29

Main heading: Acoustic noise

Controlled terms: Acoustic fields? - ?Acoustic noise measurement? - ?Centrifugal pumps? - ?Frequency domain analysis? - ?Hydrodynamics? - ?Impellers? - ?Large eddy simulation? - ?Numerical methods? - ?Stators? - ?Structural dynamics ? - ?Thermal noise

Uncontrolled terms: Characteristic frequencies? - ?Flow induced structure? - ?Flow-borne noise? - ?Hydrodynamic noise? - ?Interior noise? - ?Large Eddy simulation methods? - ?Structural characteristics? - ?Time and frequency domains

Classification code: 408 Structural Design

Structural Design

? - ?601.2 Machine Components

Machine Components

? - ?618.2 Pumps

Pumps

? - ?631 Fluid Flow

Fluid Flow

? - ?705.1 Electric Machinery, General

Electric Machinery, General

? - ?751 Acoustics, Noise. Sound

Acoustics, Noise. Sound

? - ?751.4 Acoustic Noise

Acoustic Noise

? - ?921 Mathematics

Mathematics

Numerical data indexing: Decibel 1.80e+02dB, Frequency 4.75e+01Hz, Percentage 4.00e+00%

DOI: 10.6041/j.issn.1000-1298.2018.04.018

Compendex references: YES

Database: Compendex

 

      

37. Pure Rolling Steering System Design and Research on Non-sideslip Steering Control for Wheeled AGV

Accession number: 20182605375672

Authors: Xie, Yongliang (1, 2); Yin, Jianjun (3); He, Kun (3); Yu, Chengchao (3); Hu, Xudong (1)

Author affiliation: (1) School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou; 310018, China; (2) Logistic Technology Department, Zhejiang Technical Institute of Economics, Hangzhou; 310018, China; (3) Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang; 212013, China

Corresponding author: Yin, Jianjun(yinjianjun@ujs.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 27-35

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Aiming to eliminate the wheel sideslip of the front wheel guided AGV, a kind of double crank steering system with changing length link was designed based on the steering principle of Ackermann. By deducing steering dynamics models, closed loop control models of rotation angle of left and right front wheels were established in consideration of steering resisting moment. PID synchronous control algorithm of steering angle of left and right front wheels was proposed. The dynamic responses of steering control models were simulated by Matlab, and the relative control parameters were obtained. With Panasonic PLC as the core, a measurement and control system of AGV steering was built up, which consisted of AC servo motor of left front wheel, AC servo motor of push rod, actuator and encoder. Synchronous closed loop control flow of front wheel steering system was designed, and real-time synchronous control of rotation angle of left and right front wheels and the collection of rotation angle data were realized to meet the principle of pure rolling steering. Pivot steering test on grassland roadway and turning travel test of AGV along S-type trajectory under hard roadway showed that the errors between expected turning angle and actual turning angle of left and right front wheels of steering system of front wheel guide AGV were no more than 0.1°, and AGV steering system can approximately satisfy the movement condition of pure rolling and non-sideslip, which validated the correctness and effectiveness of pure rolling steering system design of wheeled AGV and steering control. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: Electric machine control

Controlled terms: AC motors? - ?Closed loop control systems? - ?Rotation? - ?Systems analysis? - ?Wheels

Uncontrolled terms: Closed-loop control? - ?Front-wheel steering? - ?Measurement and control systems? - ?Steering control? - ?Steering dynamics? - ?Steering systems? - ?Synchronous control? - ?Wheeled AGV

Classification code: 601.2 Machine Components

Machine Components

? - ?705.3.1 AC Motors

AC Motors

? - ?731.2 Control System Applications

Control System Applications

? - ?931.1 Mechanics

Mechanics

? - ?961 Systems Science

Systems Science

DOI: 10.6041/j.issn.1000-1298.2018.04.003

Compendex references: YES

Database: Compendex

 

      

38. Design and Experiment of Pneumatic-mechanical Combined Precision Metering Device for Soybean

Accession number: 20182605375678

Authors: Jia, Honglei (1, 2); Chen, Yulong (1); Zhao, Jiale (1, 2); Wang, Jiaxu (1); Guo, Mingzhuo (1); Zhuang, Jian (1, 2)

Author affiliation: (1) College of Biological and Agricultural Engineering, Jilin University, Changchun; 130025, China; (2) Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun; 130025, China

Corresponding author: Zhao, Jiale(zhaojiale0313@163.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 75-86 and 139

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Seeding absence caused by negative pressure drops is a major technical problem in pneumatic precision metering device. A novel design of a soybean precision metering device was presented, which was compatible with pneumatic and mechanical combination, that consisted primarily of a plate, a covering, a shall and a shaft. The plate of the pneumatic-mechanical combined seed metering device had three seed picking institutions, suction hole, guide groove and pickup hole. To ensure seeding performance in the case of negative pressure drops, three institutions worked together to change the movement of soybean seed. The discrete element simulation software EDEM was used to simulate to optimize the geometric structure parameters of the guide groove, and the Hertz-Mindlin no-slip contact model was selected for the simulation. Seed speed, seed number and miss filling rate were used as test indexes for the simulation. The optimal angle and depth of the guide groove were 45° and 2 mm, respectively. The soybean seeds of Jiyu 302, which was widely adopted in Jilin Province, were used as an object of indoor bench test and field trial. The indoor bench test was carried out on a JPS-12 test bench, which was widely used to research the performance of seed metering device. Seed hole size, forward speed and negative pressure were chosen as test factors. Qualified rate, multiple rate and missing rate were used as test indexes. The variance analysis, as well as regression analysis of the test data, was carried out by Matlab software. The results showed that seed hole size, forward speed and negative pressure significantly affected the seeding performance. The optimal geometric parameters of the seed metering device were as follows: the up edge width of the seed hole was 9.5 mm, the width between front and back face was 9.5 mm, the below edge width and depth was 7.3 mm and 5.7 mm, respectively. With those optimal geometric parameters, the qualified rate of the pneumatic-mechanical combined seed metering device was no less than 95% when the forward speed was no greater than 8.6 km/h and the negative pressure was no less than 1.6 kPa. Field trials were carried out in the experimental field of Agricultural Machinery Research Institute in Changchun, Jilin Province. A 2BGD-6 pneumatic precision planter was used in the field trials, which was designed by Jilin University and manufactured by Heilongjiang Bonong Machinery Co., Ltd.. The following test results were obtained: the qualified rate was 93.67%, the multiple rate was 3.32% and the missing rate was 3.01%. Furthermore, another bench test was carried out to compare among the pneumatic-mechanical combined precision metering device, a traditional air-suction type metering device and a MASCHIO air-sucking type metering device. The comparative bench test results showed two points: firstly, when the negative pressure was dropped to 1.1 kPa, the qualified rates were improved by 6.48 and 1.92 percentage points, respectively, compared with traditional and MASCHIO metering device. On the other hand, when the negative pressure was dropped to 0.6 kPa, the qualified rates were improved by 9.12 and 4.25 percentage points, respectively. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Software testing

Controlled terms: Agricultural machinery? - ?Drops? - ?Experiments? - ?Geometry? - ?MATLAB? - ?Plates (structural components)? - ?Pneumatic materials handling equipment? - ?Pneumatics? - ?Pressure drop? - ?Regression analysis

Uncontrolled terms: Discrete element analysis? - ?Discrete element simulation? - ?Geometric structure? - ?Negative pressures? - ?Precision metering? - ?Research institutes? - ?Seed metering devices? - ?Seeding performance

Classification code: 408.2 Structural Members and Shapes

Structural Members and Shapes

? - ?632.3 Pneumatics

Pneumatics

? - ?632.4 Pneumatic Equipment and Machinery

Pneumatic Equipment and Machinery

? - ?723.5 Computer Applications

Computer Applications

? - ?821.1 Agricultural Machinery and Equipment

Agricultural Machinery and Equipment

? - ?901.3 Engineering Research

Engineering Research

? - ?921 Mathematics

Mathematics

? - ?922.2 Mathematical Statistics

Mathematical Statistics

Numerical data indexing: Percentage 3.01e+00%, Percentage 3.32e+00%, Percentage 9.37e+01%, Percentage 9.50e+01%, Pressure 1.10e+03Pa, Pressure 1.60e+03Pa, Pressure 6.00e+02Pa, Size 2.00e-03m, Size 5.70e-03m, Size 7.30e-03m, Size 9.50e-03m, Velocity 2.39e+00m/s

DOI: 10.6041/j.issn.1000-1298.2018.04.009

Compendex references: YES

Database: Compendex

 

      

39. Parameters Calibration of Vermicomposting Nursery Substrate with Discrete Element Method Based on JKR Contact Model

Accession number: 20182605375709

Authors: Luo, Shuai (1, 2); Yuan, Qiaoxia (1, 2); Gouda, Shaban (1, 3); Yang, Longyuan (1, 2)

Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture, Wuhan; 430070, China; (3) Faculty of Agriculture, Benha University, Benha; 13736, Egypt

Corresponding author: Yuan, Qiaoxia(qxyuan@mail.hzau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 343-350

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The angle of repose (AoR) is one of the most important macroscopic parameters in characterizing the behavior of vermicomposting nursery substrate. It is strongly depended on the material properties, such as moisture content, particle density, sliding and rolling frictions of particles, particle size and shape. A simulation and experimental study was presented to determine the AoR of vermicomposting nursery substrate under different moisture contents, and the other parameters such as sliding and rolling frictions were investigated. The simulation model was performed by discrete element method (DEM). An AoR measuring instrument was designed. The outline of the accumulation body was obtained by digital image analysis (DIA) method, and fitted with the Gaussian distribution formula to fit the AoR. The Plackett-Burman test was used to select the experimental factors with significant effect on the results. Based on the JKR contact model, the coefficient of static friction between the particles, the coefficient of rolling friction between the particles and the surface energy of JKR were represented from the parameters related to vermicomposting nursery substrate particles. The Box-Behnken test was carried out to obtain the regression model between the AoR and the significant parameters. Quadratic polynomial regression model between AoR and the three significant parameters was established. The comparison between the more common linear fitting model and the exponential fitting model proposed was carried out. The experimental results showed that the model can predict the vermicomposting nursery substrate parameters based on the AoR. The simulation results were compared with the experimental measurements, and the results of AoR agreed with the actual results, where the difference was 1.53% and 0.22%, respectively. Also, the exponential fitting model was more accurate. Finally, the research results can provide a reference for the determination of AoR of other bulk materials and provide a way to derive other unpredictable parameters by measuring readily measured parameters such as moisture content. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 32

Main heading: Moisture determination

Controlled terms: Calibration? - ?End effectors? - ?Finite difference method? - ?Moisture? - ?Particle size? - ?Regression analysis? - ?Stiction? - ?Tribology

Uncontrolled terms: Angle of repose? - ?Coefficient of rolling frictions? - ?Different moisture contents? - ?Digital image analysis? - ?Macroscopic parameters? - ?Nursery substrates? - ?Parameters calibrations? - ?Particle size and shape

Classification code: 731.5 Robotics

Robotics

? - ?921.6 Numerical Methods

Numerical Methods

? - ?922.2 Mathematical Statistics

Mathematical Statistics

? - ?931 Classical Physics; Quantum Theory; Relativity

Classical Physics; Quantum Theory; Relativity

? - ?944.2 Moisture Measurements

Moisture Measurements

Numerical data indexing: Percentage 1.53e+00%, Percentage 2.20e-01%

DOI: 10.6041/j.issn.1000-1298.2018.04.040

Compendex references: YES

Database: Compendex

 

      

40. Retrieving Winter Wheat Above-ground Dry Biomass Based on Hyperion Hyperspectral Imagery

Accession number: 20182605375692

Authors: Ren, Jianqiang (1); Wu, Shangrong (1); Liu, Bin (2); Chen, Zhongxin (1); Liu, Xingren (3); Li, He (4)

Author affiliation: (1) Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing; 100081, China; (2) Beijing North-star Digital Remote Sensing Technology Co., Ltd., Beijing; 100120, China; (3) Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing; 100081, China; (4) Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing; 100101, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 199-211

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: How to efficiently use hyperspectral remote sensing data to quantitatively retrieve bio-physical and bio-chemical crop parameters and accurately obtain regional crop growth information has always been one of the hot issues in agricultural quantitative remote sensing researches. Based on optimal selection of sensitive hyperspectral bands, the research on retrieval of winter wheat above-ground dry biomass (ADBM) from Hyperion hyperspectral imagery was carried out in Shenzhou County, Hebei Province of Huang-Huai-Hai Plain which was the major grain producing region in China. Firstly, through analyzing relationship and their coefficient of determination (R2) values between field-measured ADBM of winter wheat and narrow band vegetation index (N-VIs) from crop canopy hyperspectral data, the method of determining hyperspectral sensitive band centers based on areas weight of R2maximum values was proposed and applied. Then, supported by results of hyperspectral sensitive band centers, Hyperion hyperspectral remote sensing data was used to retrieve winter wheat ADBM at regional scale by using the N-VIs, and the accuracy of winter wheat biomass estimation results was validated. The Hyperion remote sensing data was acquired on Apr. 23, 2014, which was at the booting stage of winter wheat, and the used N-VIs included narrow band normalized difference vegetation index (N-NDVI), narrow band difference vegetation index (N-DVI) and narrow band ratio vegetation index (N-RVI). Compared with field-measured winter wheat ADBM, based on optimal selection of sensitive hyperspectral bands and Hyperion N-VIs constructed by the selected sensitive bands, the method of using Hyperion N-VIs to retrieve winter wheat ADBM had better performance, and the accuracy order of winter wheat ADBM of the N-VIs were determined, showing a descending trend as follows: N-NDVI, N-RVI and N-DVI. Among them, based on the Hyperion N-NDVI constructed by the selected sensitive bands (528.57 nm and 962.91 nm), the retrieval result of ADBM of winter wheat was the best and the relative error (RE) and normalized root mean square error (NRMSE) were 12.65% and 13.78%, respectively. It was proved that based on optimal selection of sensitive hyperspectral bands, using Hyperion N-VIs to retrieve winter wheat ADBM had certain feasibility and effectiveness. It could provide a new thought thread for hyperspectral remote sensing sensitive bands selection and for the improvement of quantitatively retrieving bio-physical and bio-chemical crop parameters. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 31

Main heading: Remote sensing

Controlled terms: Biomass? - ?Crops? - ?Mean square error? - ?Spectrometers? - ?Spectroscopy? - ?Vegetation

Uncontrolled terms: Coefficient of determination? - ?Hyperspectral remote sensing? - ?Hyperspectral remote sensing data? - ?Narrow band vegetation indices? - ?Normalized difference vegetation index? - ?Sensitive bands? - ?Vegetation index? - ?Winter wheat

Classification code: 741.3 Optical Devices and Systems

Optical Devices and Systems

? - ?821.4 Agricultural Products

Agricultural Products

? - ?922.2 Mathematical Statistics

Mathematical Statistics

Numerical data indexing: Percentage 1.27e+01%, Percentage 1.38e+01%, Size 5.29e-07m, Size 9.63e-07m

DOI: 10.6041/j.issn.1000-1298.2018.04.023

Compendex references: YES

Database: Compendex

 

      

41. Influence of Land Structure Change on Balance of Soil and Water Resources

Accession number: 20182605375706

Authors: Gong, Xinglong (1); Fu, Qiang (1); Guan, Yinghong (1); Xing, Zhenxiang (1); Wang, Bin (1); Zhang, Meng (1)

Author affiliation: (1) College of Water Conservancy and Architecture, Northeast Agricultural University, Harbin; 150030, China

Corresponding author: Xing, Zhenxiang(zxxing@neau.edu.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 319-329

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Few models were constructed to depict the influence of land structure change on water and soil resources balance, most of which were based on the simple water balance equation or conceptual model and hardly reflected the influence of uneven spatial distribution and change of water and soil resources on water and soil resources balance. Based on the conception of FH69 blueprint model and LBM, grid LBMGTOPMODEL was constructed. PDSI index of Naolihe River Basin was calculated quantitatively by means of LBMGTOPMODEL and GIS taking grid as a unit, based on data in 1990 without paddy farmland and data in 2013 with paddy farmland. And then the impact of land structure change on water and soil resources balance was assessed according to the PDSI index. Results showed that there was little change of areas of grassland, woodland and building land during 1990-2013. The change of farmland was mainly due to turn of unused land and drought farmland into paddy farmland, but the draught farmland was still the main type of farmland. During rice growth period from May to early August, the increase of evapotranspiration, decrease of water supply, increase of water loss, and increase of suitable rainfall in downstream slope of paddy farmland resulted in the increase of evapotranspiration constant and decrease of water supply constant, and corresponding increase of runoff constant, water loss constant and climate characteristic constant in Naolihe River basin. The frequency of suitable rainfall in paddy was increased obviously, which converted Naolihe River Basin from slight humid region into appropriate farmland, not too wet or too drought. The difference of draught index under two conditions was enlarged at the growth stage of paddy farmland during May and July, while the influence of paddy farmland on draught was decreased as the decrease of water demand of paddy farmland. The results can provide reference for the influence of paddy farmland development on regional water and soil resources balance and regional drought assessment. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 26

Main heading: Farms

Controlled terms: Drought? - ?Evapotranspiration? - ?Rain? - ?Rivers? - ?Soils? - ?Water supply? - ?Watersheds

Uncontrolled terms: Climate characteristics? - ?Conceptual model? - ?Humid regions? - ?Hydrological constant? - ?PDSI? - ?Soil resources? - ?Structure change? - ?Water balance equation

Classification code: 443.3 Precipitation

Precipitation

? - ?444.1 Surface Water

Surface Water

? - ?446.1 Water Supply Systems

Water Supply Systems

? - ?483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

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

Agricultural Equipment and Methods; Vegetation and Pest Control

DOI: 10.6041/j.issn.1000-1298.2018.04.037

Compendex references: YES

Database: Compendex

 

      

42. Wireless Sensor Network Location Algorithms Based on Kernel Adaptive Filtering

Accession number: 20182605375696

Authors: Li, Jun (1, 2); Zhao, Chang (1)

Author affiliation: (1) School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou; 730070, China; (2) Rail Transit Electrical Automation Engineering Laboratory of Gansu Province, Lanzhou; 730070, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 241-248

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: For the change of dynamic indoor environment and the effect of time-varying received signal strength on positioning accuracy, a class of indoor positioning algorithms for agricultural wireless sensor networks using kernel adaptive filtering was proposed, which included quantized kernel least mean square (QKLMS) as well as fixed-budget kernel recursive least-squares (FB-KRLS) algorithm. The QKLMS algorithm used a simple vector quantization approach as an alternative of sparsification to curb the growth of the radial basis function structure in kernel adaptive filtering. The FB-KRLS algorithm was an online kernel method by fixed memory budget, which was capable of recursively learning nonlinear mapping and tracking change over time. In contrast to a previous sliding-window based technique, the presented algorithm did not prune the oldest data point in every time instant but it was aimed to prune the least significant data point, thus suppressing the growth of kernel matrix. The kernel adaptive filtering algorithms achieved the indoor positioning for WSNs by building the non-linear mapping relations between the RSS fingerprint information and the physical location. The employed algorithms were applied to different indoor positioning instances in the simulation and physical environments for WSNs, under the same circumstances, compared with other kernel-based learning methods and extreme learning machine (ELM) etc. In the simulation experiment, the average localization error of the two algorithms was respectively 0.746 m and 0.443 m under three scenarios, and the average localization error of the two algorithms in the physical experiments was respectively 0.547 m and 0.282 m under two scenarios. Experimental results showed that the proposed adaptive filtering algorithms can improve the positioning accuracy, and its online learning ability made the proposed two localization algorithms all adaptable to the dynamic changes of the environments. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 22

Main heading: Adaptive filtering

Controlled terms: Adaptive filters? - ?Agricultural machinery? - ?Budget control? - ?Dynamics? - ?Indoor positioning systems? - ?Information filtering? - ?Learning algorithms? - ?Learning systems? - ?Mapping? - ?Position control ? - ?Radial basis function networks? - ?Wireless sensor networks

Uncontrolled terms: Adaptive filtering algorithms? - ?Extreme learning machine? - ?Indoor positioning? - ?Kernel adaptive filtering? - ?Kernel least mean squares? - ?Kernel recursive least squares? - ?Received signal strength? - ?Vector quantization approach

Classification code: 405.3 Surveying

Surveying

? - ?716.3 Radio Systems and Equipment

Radio Systems and Equipment

? - ?731.3 Specific Variables Control

Specific Variables Control

? - ?821.1 Agricultural Machinery and Equipment

Agricultural Machinery and Equipment

? - ?903.1 Information Sources and Analysis

Information Sources and Analysis

Numerical data indexing: Size 2.82e-01m, Size 4.43e-01m, Size 5.47e-01m, Size 7.46e-01m

DOI: 10.6041/j.issn.1000-1298.2018.04.027

Compendex references: YES

Database: Compendex

 

      

43. Fractional Vegetation Cover Extraction Method of Winter Wheat Based on UAV Remote Sensing and Vegetation Index

Accession number: 20182605375693

Authors: Niu, Yaxiao (1, 2); Zhang, Liyuan (1, 2); Han, Wenting (1, 3); Shao, Guomin (1, 2)

Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) Key Laboratory of Agricultural Internet of Things, Ministry of Agriculture, Yangling; Shaanxi; 712100, China

Corresponding author: Han, Wenting(hanwt2000@126.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 212-221

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Fractional vegetation cover (FVC) is an important index of crop growth status, as well as one of the major factors affecting crop photosynthesis, transpiration and water use efficiency. Currently, there are some problems that satellite remote sensing technology widely used is difficult to meet the requirement of fractional vegetation cover extraction in field scale for the low temporal and spatial resolution, the extraction of vegetation coverage based on artificial ground image is time consuming and laborious, the operating cost is high, and the remote sensing image acquired by the unmanned aerial vehicle (UAV) remote sensing system without integrated gimbal is geometrically distorted. To address the issues above, a UAV multi-spectral remote sensing image acquisition system integrated gimbal and position and orientation system(POS)data acquisition modules was developed, which had the ability to acquire the reflection information for red, green and near-infrared bands between 520 nm and 920 nm. Taking winter wheat as an example, UAV flying experiments were conducted in different growing stages, covering over-wintering period, jointing stage, flag leaf stage and heading date, with 55 m flying height and 2.2 cm multispectral image resolution. A rapid FVC extraction method was proposed, combining supervised classification with vegetation index histogram, by which the classification thresholds of normalized difference vegetation index (NDVI), soil-adjusted vegetation index (SAVI) and modified soil-adjusted vegetation index (MSAVI) for field wheat were obtained with the value of 0.475 6, 0.705 6 and 0.635 0, respectively. The FVC reference was extracted based on the visible light remote sensing image with a high spatial resolution of 0.8 cm captured synchronously with multi-spectral image. The results showed that the fractional vegetation cover of winter wheat could be extracted by multi-spectrum remote sensing technology and vegetation index method with good accuracy. Compared with SAVI and MSAVI, the extraction result based on NDVI classification threshold was the most accurate with the smallest absolute error. The use of UAV carrying a multi-spectral camera and vegetation index threshold method provided a new way to extract fractional vegetation cover, which had certain reference value for the extraction of fractional vegetation cover in field scale. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 50

Main heading: Remote sensing

Controlled terms: Antennas? - ?Crops? - ?Data acquisition? - ?Extraction? - ?Image acquisition? - ?Image resolution? - ?Infrared devices? - ?Spectroscopy? - ?Unmanned aerial vehicles (UAV)? - ?Vegetation

Uncontrolled terms: Fractional vegetation cover? - ?Multispectral remote sensing image? - ?Normalized difference vegetation index? - ?Position and orientation system(POS)? - ?Remote sensing technology? - ?Vegetation index? - ?Visible-light remote sensing? - ?Winter wheat

Classification code: 652.1 Aircraft, General

Aircraft, General

? - ?723 Computer Software, Data Handling and Applications

Computer Software, Data Handling and Applications

? - ?723.2 Data Processing and Image Processing

Data Processing and Image Processing

? - ?802.3 Chemical Operations

Chemical Operations

? - ?821.4 Agricultural Products

Agricultural Products

Numerical data indexing: Size 2.20e-02m, Size 5.20e-07m to 9.20e-07m, Size 5.50e+01m, Size 8.00e-03m

DOI: 10.6041/j.issn.1000-1298.2018.04.024

Compendex references: YES

Database: Compendex

 

      

44. Visual Detection Technology of Green Citrus under Natural Environment

Accession number: 20182605375674

Authors: Xiong, Juntao (1); Liu, Zhen (1); Tang, Linyue (1); Lin, Rui (1); Bu, Rongbin (1); Peng, Hongxing (1)

Author affiliation: (1) College of Mathematics and Informatics, South China Agricultural University, Guangzhou; 510642, China

Corresponding author: Peng, Hongxing(77481028@qq.com)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 45-52

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: China is one of the main planting sites of citrus. Since citrus is the economic pillar of farmers from many producing regions and the raw ingredients of many fruit processing facilities, there is a strong connection between citrus output and economic benefits. The output can influence farmers’ income and facilities’ productivity directly. By estimating the output of citrus, the facilities can analyze the production and marketing situation and adjust the pricing policy in time, which is significant to the macro-control of citrus market. For a long time, the agricultural production in China relies mainly on manual work, which has high labor intensity and low efficiency. A precise visual detection of citrus can estimate the output. Also, it can provide technical support for the citrus picking robot. Therefore, it is of great significance to the study of visual detection of green citrus under natural environment. Green citrus has similar color feature to the background, which makes the visual detection of fruits difficult to be implemented. Based on deep learning technology, the visual detection of green citrus was studied by using faster RCNN. The image acquisition experiment of green citrus was designed firstly. Then 2160 images were acquired and 1500 of them were selected from artificial selection. These 1500 images contained different amounts of fruit, different areas of scale and different illuminating angles. Totally 1200 images were selected randomly as training set. The rest 300 images were left for verification. Then the experimental environment of deep learning was configured, the image acquisition experiment was designed and the sample set of green citrus was set up. Making tuning of hyper-parameters and setting the learning rate as 0.01, batch size as 128 and momentum as 0.9 to train the model. The MAP of test set by using trained model was 85.49%. Comparison experiment of Faster RCNN and Otsu method was conducted under different lighting environments, different sizes of citrus and different amounts of citrus within an image. Defining value F as comparative evaluation index to analyze the detection result of the two methods. The F value of Faster RCNN under different lighting conditions was 77.45%, which was 59.53% when Otsu method was used. The F value of different amounts of citrus were 82.58% and 60.34%. With images of citrus in different sizes, the F values were 73.53% and 49.44%. Results above showed that the given method had better detection result. It can provide technical support for automatic production in orchard and visual detection of picking robot. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 21

Main heading: Citrus fruits

Controlled terms: Agriculture? - ?Commerce? - ?Deep learning? - ?Image acquisition? - ?Lighting

Uncontrolled terms: Agricultural productions? - ?Artificial selection? - ?Comparative evaluations? - ?Experimental environment? - ?Faster RCNN? - ?Green citrus? - ?Natural environments? - ?Visual detection

Classification code: 723 Computer Software, Data Handling and Applications

Computer Software, Data Handling and Applications

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

Agricultural Equipment and Methods; Vegetation and Pest Control

? - ?821.4 Agricultural Products

Agricultural Products

Numerical data indexing: Percentage 4.94e+01%, Percentage 5.95e+01%, Percentage 6.03e+01%, Percentage 7.35e+01%, Percentage 7.75e+01%, Percentage 8.26e+01%, Percentage 8.55e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.005

Compendex references: YES

Database: Compendex

 

      

45. Adaptation of Hargreaves Methods and Prediction of Reference Crop Evapotranspiration in Minjiang River Headwater Region

Accession number: 20182605375700

Authors: Yan, Kun (1, 2); Wang, Yukuan (1); Xu, Pei (1); Fu, Bin (1); Li, Chun (3)

Author affiliation: (1) Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu; 610041, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Powerchina Chengdu Engineering Corporation Limited, Chengdu; 610072, China

Corresponding author: Wang, Yukuan(wangyukuan@imde.ac.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 273-281

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Evapotranspiration as a key link in the water migration of soil plant atmosphere continuum, it is of great significance for hydrological cycle process responses to global climate change. Accurate estimation of reference crop evapotranspiration (ET0) is necessary in water resource management and utilization in further. In numerous methods proposed for estimating ET0, among which Hargreaves equation only requires temperature data, but there is a large deviation between Hargreaves and Penman-Monteith equation in different regions, recommend by the Food and Agriculture Organization (FAO) of the United Nations as the standard equation for estimating ET0. It is an urgent need to revise Hargreaves coefficient so as to build the appropriate equation applying less climatic factor in the area. Meanwhile, it is possible to estimate potential evaporation in future climate change by using the revised Hargreaves equation which only needs future temperature data from RegCM4.0, which is the most reliable predictive data in further. The temperature based Hargreaves equation is confirmed to have a theoretical basis because temperature is the most important meteorological factor affecting ET0through path analysis in the Minjiang river headwater region. The non-calibrated Hargreaves equation overestimated reference crop evapotranspiration, especially from April to October, and the maximum absolute deviation and relative deviation were 31.60 mm and 29.7%, respectively. So it was necessary to adjust Hargreaves coefficient (AHC). AHC at the monthly scale, obtained by regression-based local calibration, minimized absolute deviation and relative deviation between the calibrated Hargreaves and the FAO Penman-Monteith equation, and the root mean square error (RMSE), modeling efficiency (EF), index of agreement (d) and coefficient of determination (CD), which were 3.76 mm, 0.39, 0.8 and 0.84, were significantly lower than those of non-calibrated Hargreaves (14.66 mm, 5.74, 0.51 and 7.81). The Hargreaves coefficient can meet the estimation requirements of ET0in the study area, and it is available to predict ET0in future. Under a future climate scenario, ET0in the study area showed a increasing tendency, with a tendency rate of 5.6 mm/(10 a), the increase, however, would be slowed down. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 48

Main heading: Climate change

Controlled terms: Crops? - ?Evapotranspiration? - ?Mean square error? - ?Regression analysis? - ?Rivers? - ?Water management

Uncontrolled terms: Adaptation evaluation? - ?Climatic changes? - ?Hargreaves? - ?Head waters? - ?Penman Monteith? - ?Reference crop evapotranspirations

Classification code: 443.1 Atmospheric Properties

Atmospheric Properties

? - ?821.4 Agricultural Products

Agricultural Products

? - ?922.2 Mathematical Statistics

Mathematical Statistics

Numerical data indexing: Percentage 2.97e+01%, Size 1.47e-02m, Size 3.16e-02m, Size 3.76e-03m

DOI: 10.6041/j.issn.1000-1298.2018.04.031

Compendex references: YES

Database: Compendex

 

      

46. Effects of Straw Incorporation on Paddy Soil Structure in Rice-Wheat Rotation System

Accession number: 20182605375703

Authors: Fang, Huan (1, 2); Li, Yi (3); Zhou, Hu (1); Yan, Xiaoyuan (1); Peng, Xinhua (1)

Author affiliation: (1) State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing; 210008, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Resources and Environmental Sciences, Northeast Agricultural University, Harbin; 150030, China

Corresponding author: Peng, Xinhua(xhpeng@issas.ac.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 297-302

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: The effects of straw incorporation on the structure of a paddy soil in a rice-wheat rotation system were studied. Undisturbed and bulk soil samples were collected from the top layer (0~10 cm) of a paddy soil in a 25-year long-term field experiment in Changshu Agro-ecological Experimental Station. There were four treatments: no fertilization (CK); balanced chemical fertilization (NPK); incorporation of harvested rice/wheat straw at a moderate rate of 2.25 t dry-weight per hectare per season plus balanced chemical fertilizers (NPKS1); incorporation of harvested rice/wheat straw at a high rate of 4.50 t dry-weight per hectare per season plus balanced chemical fertilizers (NPKS2). Soil aggregate size distribution and stability were determined by wet sieving method. Soil pore size distribution was measured by using X-ray computed tomography and image processing. Compared with the CK treatment, the NPK treatment increased soil organic carbon (SOC) content and decreased soil bulk density significantly, while no significant difference was found for the aggregate size distribution, macroporosity (greater than 0.032 mm) and pore size distribution. Compared with the NPK treatment, straw incorporation treatments, NPKS1 and NPKS2, increased SOC by 10.0% and 23.1%, respectively, and reduced soil bulk density by 14.0% and 19.4%, respectively. Soil aggregate size distribution and water stability was not affected by straw incorporation. The macroporosity (greater than 0.032 mm) and pore size distribution of NPKS1 were not significantly different from the NPK treatment. However, the macroporosity (greater than 0.032 mm) of NPKS2 was 110.6% greater than that of the NPK treatment. In the rice-wheat rotation system, incorporation of total harvested rice/wheat straw plus balanced chemical fertilizers could improve soil physical structure by decreasing soil bulk density, increasing organic carbon content of bulk soil and each size fraction, increasing total porosity and macroporosity. While incorporation of total harvested rice/wheat straw plus balanced chemical fertilizers did not improve soil physical properties significantly. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 24

Main heading: Soil surveys

Controlled terms: Aggregates? - ?Computerized tomography? - ?Fertilizers? - ?Harvesting? - ?Image processing? - ?Organic carbon? - ?Pore size? - ?Size distribution? - ?Soils

Uncontrolled terms: Micro CT? - ?Paddy soils? - ?Soil aggregate? - ?Soil pores? - ?Straw incorporations

Classification code: 406 Highway Engineering

Highway Engineering

? - ?483.1 Soils and Soil Mechanics

Soils and Soil Mechanics

? - ?723.5 Computer Applications

Computer Applications

? - ?804 Chemical Products Generally

Chemical Products Generally

? - ?804.1 Organic Compounds

Organic Compounds

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?922.2 Mathematical Statistics

Mathematical Statistics

? - ?951 Materials Science

Materials Science

Numerical data indexing: Age 2.50e+01yr, Percentage 1.00e+01%, Percentage 1.11e+02%, Percentage 1.40e+01%, Percentage 1.94e+01%, Percentage 2.31e+01%, Size 0.00e+00m to 1.00e-01m, Size 3.20e-05m

DOI: 10.6041/j.issn.1000-1298.2018.04.034

Compendex references: YES

Database: Compendex

 

      

47. Parameters Optimization of Wheat Spike Differentiation Stages Model Based on SCE-UA Algorithm

Accession number: 20182605375695

Authors: Liu, Junming (1, 2); Pan, Peizhu (1, 2); Wang, Pengxin (1, 2); Cui, Zhenzhen (1, 2); Hu, Xin (3)

Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Remote Sensing for Agri-Hazards, Ministry of Agriculture, Beijing; 100083, China; (3) Wheat Research Institute, Shangqiu Academy of Agriculture and Forestry Sciences, Shangqiu; 476000, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 232-240

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: WheatGrow model is a mechanism model for the simulation of growth and development process of wheat spike differentiation, but the crop varietal parameters to drive the model are more difficult to obtain, which greatly limits its application. Shangqiu, which is in Henan Provice was taken as the studying area and the sensitivity of varietal parameters of WheatGrow model was analyzed with the method of one-at-a-time (OAT). On this basis, the cost function was constructed with start date of heading as the constraint condition, and shuffled complex evolution method developed at the University of Arizona(SCE-UA) was applied to search for optimal varietal parameters. At last, a series of experiments on spike differentiation stages were carried out in two years (from 2015 to 2016 and from 2016 to 2017) to verify optimized results and the model. The results showed that intrinsic earliness (IE) had the most significant effect on the simulation results of spike differentiation stages, temperature sensitivity (TS) had higher sensitivity than photoperiod sensitivity (PS) and physiological vernalization time (PVT), and the sensitivity of physiological vernalization time (PVT) was the lowest of all varietal parameters. The mean absolute error (MAE) and root mean square error (RMSE) between the simulated and the observed values of the spike differentiation stages based on the optimized parameters were both less than three days, indicating that the SCE-UA algorithm can effectively obtain the optimal parameters of WheatGrow model. Therefore, the SCE-UA algorithm was a feasible optimization method for WheatGrow calibration and validation. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 30

Main heading: Physiological models

Controlled terms: Cost functions? - ?Crops? - ?Mean square error? - ?Parameter estimation? - ?Physiology? - ?Plants (botany)

Uncontrolled terms: Calibration and validations? - ?Feasible optimization methods? - ?Parameters optimization? - ?Photoperiod sensitivities? - ?Root mean square errors? - ?SCE-UA algorithms? - ?Shuffled Complex Evolution? - ?Winter wheat

Classification code: 461.9 Biology

Biology

? - ?821.4 Agricultural Products

Agricultural Products

? - ?921.5 Optimization Techniques

Optimization Techniques

? - ?922.2 Mathematical Statistics

Mathematical Statistics

DOI: 10.6041/j.issn.1000-1298.2018.04.026

Compendex references: YES

Database: Compendex

 

      

48. Experiment and Numerical Simulation of Cavitation Evolution in High Speed Centrifugal Pump with Inducer

Accession number: 20182605375686

Authors: Cui, Baoling (1); Chen, Jie (1); Li, Xiaojun (1); Lin, Zhe (1); Cai, Haibing (2); Han, Anda (3)

Author affiliation: (1) Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou; 310018, China; (2) Zhejiang Institute of Mechanical and Electrical Engineering Co., Ltd., Hangzhou; 311305, China; (3) Zhejiang Tiande Pumps Co., Ltd., Wenzhou; 325800, China

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 148-155

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Cavitation is one of the main causes that jeopardize the steady operation of high speed centrifugal pump. An inducer installed in the upsteam of the impeller is an effective method to improve the cavitation resistance performance of the pump. In order to investigate the evolution process of cavitation in a low-specific high speed centrifugal pump with inducer, the visual experiments of cavitating flow in impeller and inducer passages were carried out by high speed photography. And the internal flow characteristics of the centrifugal pump were analyzed by CFD technology. The experimental results showed that cavitation inception occurred near the blade leading edge of inducer when ΔH was 5.0 m, which was mainly caused by the tip leakage vortex. In the process of cavitation development (1.07 m ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: Cavitation

Controlled terms: Centrifugal pumps? - ?Computational fluid dynamics? - ?Efficiency? - ?High speed photography? - ?Impellers? - ?Speed? - ?Vortex flow

Uncontrolled terms: Cavitation instability? - ?Cavitation phenomenon? - ?Cavitation resistance? - ?Inducer? - ?Internal flow characteristics? - ?Net positive suction heads? - ?Tip leakage vortex? - ?Visual experiments

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

? - ?723.5 Computer Applications

Computer Applications

? - ?742.1 Photography

Photography

? - ?913.1 Production Engineering

Production Engineering

Numerical data indexing: Size 1.50e+00m, Size 5.00e+00m

DOI: 10.6041/j.issn.1000-1298.2018.04.017

Compendex references: YES

Database: Compendex

 

      

49. Operation Quality Measurement Method for Tilling Depth of Suspended Subsoiler

Accession number: 20182605375677

Authors: Yin, Yanxin (1, 2); Wang, Cheng (1, 2); Meng, Zhijun (1, 2); Chen, Jingping (1, 3); Guo, Shuxia (1, 3); Qin, Wuchang (1, 3)

Author affiliation: (1) Beijing Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China; (2) National Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China; (3) Beijing Key Laboratory of Intelligent Equipment Technology for Agriculture, Beijing; 100097, China

Corresponding author: Meng, Zhijun(mengzj@nercita.org.cn)

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 68-74

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Tilling depth was usually detected manually with a ruler in many cultivation areas in China, which was inefficient and the result had a high uncertainty, which made subsoiling monitoring difficult. A depth algorithmic model was studied on basis of the attitude of tractor’s three-point hitch for measuring tilling depth and based on which a subsoiling management system was developed and implemented. For establishing the measurement model, the movement path of the tractor and subsoiler was analyzed, and by studying the dynamical equation, the tilling depth measurement model was proposed. Tilling depth was calculated in the model by detecting the attitude of the tractor and subsoiler. In order to verify the accuracy of the measurement method, an ARM kernel based tilling depth measurement sensor and a monitoring system were developed. The system integrated GPS, GPRS and SD card together, which had ability of tilling depth measuring, working speed measuring, working position measuring and heading measuring. The working data was stored in SD card of the system, and was transmitted to the data center by GPRS at the same time for further process. The system calibration test showed that the maximum error was 0.88 cm, the average error was less than 0.21 cm, the root mean square error (RMSE) was less than 0.66 cm. Using the calibrated system to take several tests in field, the result showed that the maximum error was 1.18 cm, the average error was less than 0.45 cm and the RMSE was less than 0.64 cm, which indicated that the system had a high accuracy and stability. The system supplied an information-based method for monitoring the operation quality of subsoiling, and solved the problems caused by manual measuring. The system was useful in farming industry. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 19

Main heading: Errors

Controlled terms: Cultivation? - ?Mean square error? - ?Tractors (agricultural)? - ?Tractors (truck)

Uncontrolled terms: Management systems? - ?Measurement methods? - ?Measurement sensor? - ?Operation quality? - ?Position measuring? - ?Root mean square errors? - ?Subsoiling? - ?System calibration

Classification code: 663.1 Heavy Duty Motor Vehicles

Heavy Duty Motor Vehicles

? - ?821.3 Agricultural Methods

Agricultural Methods

? - ?922.2 Mathematical Statistics

Mathematical Statistics

Numerical data indexing: Size 1.18e-02m, Size 2.10e-03m, Size 4.50e-03m, Size 6.40e-03m, Size 6.60e-03m, Size 8.80e-03m

DOI: 10.6041/j.issn.1000-1298.2018.04.008

Compendex references: YES

Database: Compendex

 

      

50. Designation Method of Permanent Basic Farmland Based on TOPSIS and Local Spatial Autocorrelation

Accession number: 20182605375689

Authors: Yang, Jianyu (1, 2); Zhang, Xin (1); Xu, Fan (1); Ma, Ruiming (1); 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

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

Abbreviated source title: Nongye Jixie Xuebao

Volume: 49

Issue: 4

Issue date: April 25, 2018

Publication year: 2018

Pages: 172-180

Language: Chinese

ISSN: 10001298

CODEN: NUYCA3

Document type: Journal article (JA)

Publisher: Chinese Society of Agricultural Machinery

Abstract: Protecting cultivated land is to protect the foundation of development and ensure the food safety in China. Permanent basic farmland is an effective method to prevent the high-quality cultivated land from occupying by construction land, but also the basis for the construction of high standard farmland. At present, it is urgent to implement the strictest protection for cultivated land resources in China. A method for the determination of permanent basic farmland was proposed, which was based on TOPSIS and local spatial autocorrelation. Firstly, four aspects of cultivated land were considered to structure the all-round comprehensive quality evaluation system. Secondly, TOPSIS was chosen to evaluate the comprehensive quality of cultivated land. On this basis, the spatial clustering was joined, and the comprehensive quality of cultivated land was analyzed. According to the characteristics of local spatial autocorrelation type, the zoning rules were formulated. Finally, according to the comprehensive quality of cultivated land and the spatial clustering characteristics, the satisfactory cultivated land were classified into permanent basic farmland, and suggestions for protecting permanent basic farmland were provided. The new method was illustrated by using Gaobeidian country, Hebei province as a case study. According to the results, TOPSIS and local spatial autocorrelation were used, combined with the comprehensive quality of cultivated land and their spatial clustering characteristics, the former three types of cultivated land were classified as permanent basic farmland, the area of the permanent basic farmland in Gaobeidian was 339.61 km2, the area ratio was 81.75%, which achieved the relevant state regulations. Finally, three aspects of management suggestions to permanent basic farmland were proposed, which were “make laws, strict supervision”, “careful selection, expand investment” and “strengthen education, give encouragement”. The ecological landscape factors were added into the quality evaluation of cultivated land, and combined the spatial clustering method which was based on the optimal distance threshold and the improved distance spatial weight matrixes, and it provided a new way for the permanent basic farmland. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.

Number of references: 32

Main heading: Farms

Controlled terms: Autocorrelation? - ?Investments? - ?Land use? - ?Laws and legislation? - ?Quality control

Uncontrolled terms: Basic farmland designations? - ?Comprehensive qualities? - ?Construction land? - ?Quality evaluation? - ?Spatial autocorrelations? - ?Spatial clustering? - ?Spatial weight matrixes? - ?TOPSIS

Classification code: 403 Urban and Regional Planning and Development

Urban and Regional Planning and Development

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

Agricultural Equipment and Methods; Vegetation and Pest Control

? - ?913.3 Quality Assurance and Control

Quality Assurance and Control

? - ?921 Mathematics

Mathematics

? - ?971 Social Sciences

Social Sciences

Numerical data indexing: Area 3.40e+08m2, Percentage 8.18e+01%

DOI: 10.6041/j.issn.1000-1298.2018.04.020

Compendex references: YES

Database: Compendex