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2020年第10期共收录48篇
1. Working Parameter Optimization and Performance Test of Straw Fiber Machine
Accession number: 20204509472746
Title of translation:
Authors: Liu, Huanyu (1, 2); Jiang, Lianzhou (2); Chen, Haitao (3); Xia, Jiqing (3); Li, Longhai (3)
Author affiliation: (1) School of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian; 116034, China; (2) College of Food Science, Northeast Agricultural University, Harbin; 150030, China; (3) College of Engineering, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Jiang, Lianzhou(jlzname@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 161-169
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Using crop straw as material to produce degradable plant fiber film is an ideal utilization of crop straw, which could effectively solve the white pollution caused by plastic film. Efficient, clean and energy-saving fiber preparation is an important prerequisite for the production of plant fiber film. At present, there are still some shortcomings in the process of straw fiber manufacturing. Firstly, the yield of straw fiber is too low and the obtained straw fiber could only be used after screening, which increased the procedure of fiber production. Secondly, large energy consumption consumed during producing lead to the increase of production cost. To improve the yield of straw fibers and reduce energy consumption, D200 straw fiber making machine was used as carrier, and the main factors influencing fiber yield and energy consumption of the machine were determined, based on the principle of non-pollution, low energy consumption, and high quality production of straw fibers. Three factors and five levels quadratic orthogonal rotation center combination test method was carried out by using rice straw as material, and spindle speed, processing temperature and cavity gap of D200 machine were chosen as test factors. Fiber yield and energy consumption were used as test indexes. Considering the structure and working parameters of D200 type straw fiber manufacturer, also combining with the previous theoretical research and pretest, the range of spindle speed was selected as 85~135 r/min, processing temperature was 88~120 and cavity gap was 3.5~8.5 mm. The regression analysis of the test data was carried out, and the regression model between performance index and test factors was established under the condition of reliability α=0.05. At the same time, the influence of factors on the energy consumption and fiber yield performance index was also analyzed. The results of quadratic equation coefficients of fiber yield and fiber length-width ratio were used to judge the influence degree of the test factors on the performance index. Results indicated that the influence of spindle speed, processing temperature and cavity clearance on the energy consumption was very significant (P ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Low temperature production
Controlled terms: Crops? - ?Electric power utilization? - ?Energy conservation? - ?Energy utilization? - ?Entertainment industry? - ?Film preparation? - ?Pollution? - ?Processing? - ?Regression analysis? - ?Reliability analysis ? - ?Speed? - ?Temperature? - ?Testing? - ?Textile fibers
Uncontrolled terms: Low energy consumption? - ?Performance indices? - ?Processing temperature? - ?Quadratic equations? - ?Quadratic orthogonal rotation? - ?Reduce energy consumption? - ?Structure and working parameters? - ?Theoretical research
Classification code: 525.2 Energy Conservation? - ?525.3 Energy Utilization? - ?641.1 Thermodynamics? - ?706.1 Electric Power Systems? - ?821.4 Agricultural Products? - ?913.4 Manufacturing? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 8.66e+01%, Percentage 8.76e+01%, Rotational_Speed 8.50e+01RPM to 1.35e+02RPM, Rotational_Speed 9.70e+01RPM, Rotational_Speed 9.71e+01RPM, Size 3.50e-03m to 8.50e-03m, Size 5.65e-03m, Size 5.70e-03m
DOI: 10.6041/j.issn.1000-1298.2020.10.018
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
2. Thermal Environment Prediction and Validation Based on Deep Learning Algorithm in Closed Pig House
Accession number: 20204509472547
Title of translation:
Authors: Xie, Qiuju (1, 2); Zheng, Ping (1); Bao, Jun (3); Su, Zhongbin (1)
Author affiliation: (1) College of Electrical and Information, Northeast Agricultural University, Harbin; 150030, China; (2) Key Laboratory of Swine Facilities Engineering, Ministry of Agricullture and Rural Affairs, Northeast Agricultural University, Harbin; 150030, China; (3) College of Animal Science and Technology, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Su, Zhongbin(suzb001@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 353-361
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With the development of scaled pig farm, the environmental-controlled breeding production with closed house has got a rapid progress in recent years. However, in order to maximize the commercial interests, there are always limited living space designed for pigs in the closed pig house. Indoor environmental quality, especially the thermal environment quality, is particularly important in the limited living space of the closed pig house, which has significant effect on pig’s health, welfare and reproductivity. The indoor environment mainly includes thermal environment, harmful gas, dust, bacteria, light, etc. The thermal environment mainly refers to the indoor air temperature and humidity. The indoor air temperature is one of the most important environmental factors that directly affects the heat balance of pigs. Because pigs maintain a constant body temperature and carry out normal life activities through the balance of heat production and dissipation. So, indoor air temperature takes a critical role on keeping a constant pig body temperature and affect the health level and reproductive capacity of pigs. The humidity affects the evaporation and the body heat regulation of pigs. The high temperature and high humidity environment will seriously affect the pigs’ daily weight gain, at the same time, it will cause bacteria growth and disease. So, the indoor air temperature and humidity were payed much attention by many researchers in the past decades in order to maintain a suitable indoor environment for pigs. An optimized control strategy, an accuracy and timeliness environmental control was the first important task for pig house environmental control system. At present, the operation of environmental control devices in pig house mainly relies on data that collected by sensors. However, due to the data collected by sensors can only reflect the current indoor environmental conditions, it can not predict the trend of environmental variation in pig house, thus can not adjust the operation status of environmental control device in advance, to some extent, which leads to some time lag of environmental control system. Predictions of indoor environment is an effective way to provide a precision and optimal control strategy with forecasting for the indoor temperature and humidity variations to avoid some control lags. Combined with the actual historical temperature and humidity data and external influence data that collected by sensors, and based on the deep learning method, the long short-term memory (LSTM) prediction model was developed to achieve an accurate prediction and verification of temperature and humidity variation in pig house. The results showed that the predictions of temperature and humidity were consistent well with the observations whatever in winter or in summer. The maximum error of temperature was 1.9, and the mean error was 0.5; the maximum error of relative humidity was 13.5%, and the mean error was 2.3%; the mean determination coefficients R2 of temperature and humidity were 0.821 and 0.645, respectively. The established prediction model achieved a higher performance, which can provide a feasible reference for an optimal environmental control strategy and the reduction of time lag for environmental control in pig house. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 34
Main heading: Humidity control
Controlled terms: Atmospheric temperature? - ?Bacteria? - ?Deep learning? - ?Environmental management? - ?Errors? - ?Forecasting? - ?Heating? - ?Houses? - ?Learning algorithms? - ?Learning systems ? - ?Long short-term memory? - ?Mammals? - ?Optimal control systems? - ?Physiology? - ?Predictive analytics? - ?Thermal comfort
Uncontrolled terms: Determination coefficients? - ?Environmental conditions? - ?Environmental control system? - ?Environmental variations? - ?High-humidity environment? - ?Indoor environmental quality? - ?Optimal control strategy? - ?Temperature and humidities
Classification code: 402.3 Residences? - ?443.1 Atmospheric Properties? - ?454.1 Environmental Engineering, General? - ?461.9 Biology? - ?643 Space Heating, Ventilation and Air Conditioning? - ?731.1 Control Systems
Numerical data indexing: Percentage 1.35e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.040
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
3. Effects of Spring Irrigation Quotas on Soil Water and Salt Transport under Condition of Subsurface Drainage
Accession number: 20204509472455
Title of translation:
Authors: Dou, Xu (1, 2); Shi, Haibin (1, 2); Li, Ruiping (1, 2); Miao, Qingfeng (1, 2); Tian, Feng (1, 2); Yu, Dandan (1, 2)
Author affiliation: (1) College of Water Conservancy and Civil Engineer, Inner Mongolia Agricultural University, Huhhot; 010018, China; (2) Inner Mongolia Engineering Research Center of High-efficiency Water Saving Technical Equipment and Soil and Water Environmental Effects, Huhhot; 010018, China
Corresponding author: Shi, Haibin(shi_haibin@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 318-328
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to explore the effects of different spring irrigation quotas on soil water salt distribution and crop yield in salinization irrigation area under the condition of subsurface drainage. Taking the conventional spring irrigation level (2 250 m3/hm2) of open ditch drainage as the control group(CK), four gradients of 100%, 90%, 80%, and 70% (W1, W2, W3, W4) of conventional spring irrigation water volume were set under the condition of subsurface drainage, total five treatments. Leaching effect of different spring irrigation volumes combined with subsurface drainage on moderately salinized soil was studied. Water and salt distribution, salt leaching effect, control effect on groundwater depth, oil sunflower yield and water use efficiency were analyzed. The results showed that because of the larger irrigation volume and less drainage, the soil moisture content in the root layer of CK treatment was higher, but there was no significant difference in W1 and W2 treatments. W1, W2 and W3 treatments all had better desalination effects after irrigation. The soil desalination rates in the root layer were increased by 18.47, 18.24, 7.75 percentage points compared with that of CK treatment (P ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 34
Main heading: Irrigation
Controlled terms: Crops? - ?Desalination? - ?Drainage? - ?Efficiency? - ?Groundwater? - ?Groundwater flow? - ?Groundwater resources? - ?Leaching? - ?Soil moisture? - ?Sunflower oil ? - ?Water conservation? - ?Water supply
Uncontrolled terms: Comprehensive analysis? - ?Ground water depths? - ?Increasing production? - ?Irrigation quotas? - ?Percentage points? - ?Subsurface drainages? - ?Underground drainage? - ?Water use efficiency
Classification code: 444 Water Resources? - ?444.2 Groundwater? - ?445.1 Water Treatment Techniques? - ?446.1 Water Supply Systems? - ?483.1 Soils and Soil Mechanics? - ?802.3 Chemical Operations? - ?804.1 Organic Compounds? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?913.1 Production Engineering
Numerical data indexing: Percentage 1.00e+01%, Percentage 1.00e+02%, Percentage 1.80e+01%, Percentage 3.27e+00%, Percentage 3.54e+00%, Percentage 6.46e+00%, Percentage 8.00e+01%, Percentage 9.00e+01%, Size 8.00e-01m
DOI: 10.6041/j.issn.1000-1298.2020.10.036
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
4. Design and Experiment of U-shaped Cavity Type Precision Hill-drop Seed-metering Device for Rice
Accession number: 20204509472991
Title of translation: U
Authors: Zhang, Shun (1, 2); Li, Yong (1); Wang, Haoyu (1); Liao, Juan (1); Li, Zhaodong (1, 2); Zhu, Dequan (1)
Author affiliation: (1) School of Engineering, Anhui Agricultural University, Hefei; 230036, China; (2) Anhui Province Engineering Laboratory of Intelligent Agricultural Machinery and Equipment, Hefei; 230036, China
Corresponding author: Zhu, Dequan(dqzhu@sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 98-108
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to adapt simplification precision hill-drop seeding for conventional rice and simplify the seed-metering device, a unique U-shaped cavity type precision hill-drop seed-metering device for rice was designed. Based on the mechanical characteristics of rice seeds and its agronomy requirements of hill-drop seeding, a cavity type seeding plate was put forward, which characterized with seed-dropping orifice and seed-filling orifice connected by the cavity, the mechanical models of the process of seed filling and dropping were constructed, and the main structural parameters of the seeding plate were determined. The seeding objects was “Huanghuazhan” (conventional rice), experimental studies were respectively carried out on the effects of the number, length, width and inclination of the seed-filling orifice and seed-dropping angle on the seeding performance of precision and hill-drop of the seed-metering device by means of high-speed camera and JPS-12 type seed-metering device performance test bench. High-speed camera test results indicated that the precision seeding performance of the seed-metering device was better when the number, length, width and inclination of the seed-filling orifice were 20, 10.6 mm, 7.6 mm and 0 degree, respectively. Correspondingly, the miss-seeding rate (less than 3 seeds per hole), qualified rate (3~8 seeds per hole), reseeding rate (more than 8 seeds per hole) and seed damage rate were 0.40%, 94.00%, 5.60% and 0.13%, respectively. JPS-12 type seed-metering device performance bench test results indicated that the seed-dropping angle very significantly affected the average value and qualified rate of hole diameter, and significantly affected the variation coefficient of hole distance. The suitable seed-dropping angle of seed-metering device was 28°~33°. Under the above range of seed-dropping angle, all the average hole diameter were not more than 27.14 mm, all the qualified rate of hole diameter were not less than 96.67%, all the average hole distances were about 140 mm, and all the variation coefficient of hole distance were not more than 7.80%. The results of field experiment showed that the qualified rate, miss-seeding rate and reseeding rate were 90.28%, 0.83% and 8.89%, respectively. And the average hole diameter of 46.71 mm, qualified rate of hole diameter of 71.67%, average hole distance of 137.21 mm and variation coefficient of hole distance of 12.64% were found in the field experiment. All the sowing performance satisfied the general precision direct hill-drop seeding requirement of conventional rice in field. The research result provided a theoretical reference for the simplification design of the mechanical seed-metering device. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Pneumatic materials handling equipment
Controlled terms: Drops? - ?Filling? - ?High speed cameras? - ?Orifices? - ?Plates (structural components)
Uncontrolled terms: Field experiment? - ?Mechanical characteristics? - ?Mechanical model? - ?Precision seeding? - ?Seed metering devices? - ?Seeding performance? - ?Structural parameter? - ?Variation coefficient
Classification code: 408.2 Structural Members and Shapes? - ?691.1 Materials Handling Equipment? - ?691.2 Materials Handling Methods? - ?742.2 Photographic Equipment
Numerical data indexing: Percentage 1.26e+01%, Percentage 1.30e-01%, Percentage 4.00e-01%, Percentage 5.60e+00%, Percentage 7.17e+01%, Percentage 7.80e+00%, Percentage 8.30e-01%, Percentage 8.89e+00%, Percentage 9.03e+01%, Percentage 9.40e+01%, Percentage 9.67e+01%, Size 1.06e-02m, Size 1.37e-01m, Size 1.40e-01m, Size 2.71e-02m, Size 4.67e-02m, Size 7.60e-03m
DOI: 10.6041/j.issn.1000-1298.2020.10.012
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
5. Performances of Thermal Collecting and Releasing System Developed with Fan-coil Units in Plastic Tunnel Covered with Thermal Blanket
Accession number: 20204509472968
Title of translation: -
Authors: Li, Ming (1, 2); Geng, Ruo (1); Song, Weitang (1, 2); Wang, Pingzhi (1, 2); Li, Han (1); Wang, Xiuzhi (3)
Author affiliation: (1) College of Water Resources and Civil Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture and Rural Affairs, Beijing; 100083, China; (3) Chifeng Academic of Agriculture and Animal Husbandry Science, Chifeng; 024000, China
Corresponding author: Wang, Pingzhi(wpz@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 371-378
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A plastic tunnel covered with thermal blanket (hereafter referred to as “PTET”) is type of plastic tunnel with large span. This facility has the advantages of low construction cost, high land utilization efficiency and large space, compared with Chinese solar greenhouse, which was widely applied in Northern China for vegetable production over winter. Hence, PTET has been employed as a substitute for Chinese solar greenhouse in recent years. However, there are no passive heat storage walls in PTET. It is necessary to supply auxiliary heating in PTET to maintain high indoor air temperature (Tin) and meeting the requirements of the indoor vegetables. To solve the problem, a thermal collecting and releasing system developed with fan-coil units (TSFU) was employed to avoid high cost and air pollution caused by the application of conventional heating methods. The objective was to analyze the thermal performances of TSFU in PTET. In this experiment, TSFU was composed of 15 fan-coil units hanging beneath the ridge, a water tank, a water pump and several pipes. By circulating water within the system, TSFU collected the surplus air thermal energy in daytime and released them in nighttime to heat the PTET. According to the test, the thermal energy released at nighttime (Qr) in solar days and cloudy days were (433.0±48.6) MJ and (199.3±0.1) MJ, respectively. Qr in the cloudy day was just 46.0% of that in the solar days, due to low Tin in the daytime. As a result, Tin in the nighttime of solar days and cloudy days were elevated by (2.5±0.4) and (1.1±0.3), respectively. The coefficient of performance (COP) of TSFU in solar days and cloudy days were 2.9 and 3.1, respectively. Compared with the air heater using natural gas as the fuel, the heating cost of PTET can be decreased by 40.2% by employing the TSFU. Besides, a dynamical model for simulating the temperature of water in the water tank was developed and used to analyze the factors affecting the thermal performances of TSFU. With the simulation results, it was found that, by increasing the overall heat exchange efficiency (η) and numbers (n) of fan-coil units to 0.44 and 25, respectively, Qr in the solar days can be increased by (67.4±14.9)% and (76.1±14.7)%, respectively, due to enhanced heat exchange rate of TSFU. Under the above conditions, Qr in the cloudy days was increased by (14.9±7.6)% and (17.0±4.5)%, respectively, as well. COP was raised over 3.6±0.6. On the other hands, by increasing the water volume in the tank (V) to 52 m3, Qr in the cloudy days was increased by (31.7±20.3)%, while COP was increased by 1.0±0.7. However, Qr and COP in the solar days was not improved. Conversely, by decreasing V to 13 m3, Qr and COP were not impacted in the solar days but decreased in the cloudy days. In conclusion, it was feasible to employ TSFU to improve Tin of PTET during winter. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Thermal pollution
Controlled terms: Greenhouses? - ?Heat exchangers? - ?Heat storage? - ?Solar heating? - ?Thermal energy? - ?Thermal processing (foods)? - ?Tin? - ?Vegetables? - ?Water tanks
Uncontrolled terms: Chinese solar greenhouse? - ?Coefficient of performances (COP)? - ?Conventional heating methods? - ?Enhanced heat exchange? - ?Heat exchange efficiency? - ?Indoor air temperature? - ?Thermal Performance? - ?Vegetable productions
Classification code: 446.1 Water Supply Systems? - ?546.2 Tin and Alloys? - ?616.1 Heat Exchange Equipment and Components? - ?657.1 Solar Energy and Phenomena? - ?821.4 Agricultural Products? - ?821.6 Farm Buildings and Other Structures? - ?822.2 Food Processing Operations
Numerical data indexing: Percentage 4.02e+01%, Percentage 4.60e+01%, Volume 1.30e+01m3, Volume 5.20e+01m3
DOI: 10.6041/j.issn.1000-1298.2020.10.042
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
6. Prediction Model of Rotary Tillage Power Consumption in Paddy Stubble Field Based on Discrete Element Method
Accession number: 20204509472495
Title of translation:
Authors: Zhu, Yinghao (1, 2); Xia, Junfang (1, 2); Zeng, Rong (1, 2); Zheng, Kan (1, 2); Du, Jun (1, 2); Liu, Zhengyuan (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 and Rural Affairs, Wuhan; 430070, China
Corresponding author: Xia, Junfang(xjf@mail.hzau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 42-50
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The rotary burying blade roller is suitable for soil cultivation and straw returning in paddy stubble field in the middle and lower reaches of the Yangtze River, but the power consumption is too high. Because of the complex interaction mechanism of the structure parameters of blade roller, the high cost of trial production, the short suitable cultivation period of farmland and the long test period cycle, it is impractical to optimize the design of the cutter roller simply by the field test method. Based on the discrete element method, a prediction model of rotary tillage power consumption the paddy stubble field was constructed to assist the detection of power consumption of the rotary burying blade roller. According to the monitoring of soil moisture content in the paddy stubble field for three consecutive years, it was found that the soil moisture content was close to its plastic limit, which indicated that the soil plasticity in the paddy stubble field was poor. Combined with the form of soil damage, HertzMindlin with Bonding particle contact model was selected to characterize the adhesion and damage of the soil in the paddy stubble field. In view of the particularity of rotary tillage operation and the structural characteristics of the rotary burying blade roller, the scale of the blade roller was reduced along the width direction, and the calibration reference test was completed with the help of rotary tillage test platform. In the discrete element software, the model of rotary tillage was established, and the functional relationship between contact parameters and power consumption index was established through the equal step climbing test. Combined with the power consumption value of calibration reference test, the contact parameter value of the rotary tillage power consumption prediction model in the paddy stubble field was finally determined, and the model was established. In order to further verify the applicability of the model, the error comparison test was carried out on the universal blade roller and the rotary burying blade roller under different working conditions. The results showed that the average prediction error was 6.65%, and the range was between 3.63% and 9.48%. Combined with variance analysis, the prediction model of rotary cultivation power consumption in paddy stubble field was suitable for the prediction of power consumption under different rotary cultivation blade roller and working conditions. The average error of power consumption prediction of the real scale field test of reduction roller was 7.28%, and the range was between 2.50% and 12.81%. In the process of scaling, the error of the roller structure was changed little, which showed that the model could be used in the field test. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 33
Main heading: Predictive analytics
Controlled terms: Calibration? - ?Cultivation? - ?Electric power utilization? - ?Errors? - ?Forecasting? - ?Moisture control? - ?Moisture determination? - ?Rollers (machine components)? - ?Software testing? - ?Soil moisture ? - ?Testing
Uncontrolled terms: Average prediction error? - ?Calibration reference? - ?Cultivation periods? - ?Functional relationship? - ?Interaction mechanisms? - ?Middle and lower reaches of the yangtze rivers? - ?Structural characteristics? - ?Structure parameter
Classification code: 483.1 Soils and Soil Mechanics? - ?601.2 Machine Components? - ?706.1 Electric Power Systems? - ?723.5 Computer Applications? - ?821.3 Agricultural Methods? - ?944.2 Moisture Measurements
Numerical data indexing: Percentage 2.50e+00% to 1.28e+01%, Percentage 3.63e+00% to 9.48e+00%, Percentage 6.65e+00%, Percentage 7.28e+00%
DOI: 10.6041/j.issn.1000-1298.2020.10.006
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
7. Design and Experiment of Seed Pressing Device for Precision Seeder Based on Air Flow Assisted Seed Delivery
Accession number: 20204509473005
Title of translation:
Authors: Wang, Yunxia (1); Zhang, Wenyi (1); Yan, Wei (1); Qi, Bing (1)
Author affiliation: (1) Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing; 210014, China
Corresponding author: Qi, Bing(qb0823521@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 69-76
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The high speed operation is the development trend of precision seeding. Air flow assisted seed delivery can reduce the variation of plant spacing caused by the collision of seeds with the pipe wall and meet the requirements of high-speed operation. However, the air flow also accelerates seeds during delivery. Seeds with high speed tend to bounce after landing, which resulting in uneven plant spacing. Aiming at the above problems, a seed pressing device suitable for precision seeder with air flow assisted seed delivery was designed. The seed pressing device was installed behind the seed delivery tube on the seeder unit. When the seed fell to the ground, it was pressed by the squeezing action between the pressing wheel and the soil to avoid the seed jump and realize the accurate plant spacing. The seed pressing device was installed on the soybean precision seeder for field test, and the theoretical plant spacing was set to be 10 cm. The orthogonal test was carried out, and the factors were operating speed, horizontal distance between the end of the seed delivery tube and the pressing wheel, and projection angle of seed at the end of delivery tube. The test indexes were plant spacing qualification index and variation coefficient. The results showed that the operating speed, the horizontal distance between the end of the delivery tube and the pressing wheel had impact on the plant spacing qualification index and variation coefficient, while the projection angle had no significant impact on the plant spacing qualification index and significant impact on the plant spacing variation coefficient. At the same time, the comparison experiment was carried out under the conditions of seed pressing wheel, seed pressing tongue and no seed pressing. The results showed that the uniformity of plant spacing of seed pressing tongue and seed pressing wheel was better than that of no seed pressing operation, while the seed pressing wheel was better than the seed pressing tongue. This showed that the seed pressing wheel can significantly reduce seed bounce and had the ability to obtain the uniform plant spacing. For the seed pressing wheel, the plant spacing qualification index and coefficient of variation were significantly better than those under the conditions of seed pressing tongue and no pressing. The optimal working parameters of the seed pressing wheel were the working speed of 9.5 km/h, the projection angle of 30°, and the horizontal distance between the end of the delivery tube and the pressing wheel of 75 mm. Under these working conditions, the plant spacing qualification index and coefficient of variation were 95.68% and 10.32%, respectively. The research result can provide theoretical basis and technical support for solving the uneven planting space under the condition of air flow assisted seed delivery. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Seed
Controlled terms: Air? - ?Speed? - ?Tubes (components)? - ?Wheels
Uncontrolled terms: Coefficient of variation? - ?Development trends? - ?High-speed operation? - ?Precision seeding? - ?Projection angles? - ?Technical support? - ?Variation coefficient? - ?Working parameters
Classification code: 601.2 Machine Components? - ?619.1 Pipe, Piping and Pipelines? - ?804 Chemical Products Generally? - ?821.4 Agricultural Products
Numerical data indexing: Percentage 1.03e+01%, Percentage 9.57e+01%, Size 1.00e-01m, Size 7.50e-02m, Velocity 2.64e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.10.009
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
8. Design and Experiment of Row-controlled Shoveling and Drawing Placement Machine for Cotton-stalks Based on Agronomy of Close Planting
Accession number: 20204509472635
Title of translation:
Authors: He, Xiaowei (1, 2); Liu, Jinxiu (2, 3); Wang, Xufeng (2, 3); Xu, Yang (1); Hu, Can (1, 2); Li, Yibo (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Mechanical and Electronic Engineering, Tarim University, Alar; 843300, China; (3) The Key Laboratory of Colleges and Universities under the Department of Education of Xinjiang Uygur Autonomous Region, Alar; 843300, China
Corresponding author: Xu, Yang(xuyang@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 142-151
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Mechanized harvesting of cotton-stalks was the precondition of its industrial utilization on a large scale. In order to achieve the goal of row-controlled and low-consumption of mechanized harvesting cotton-stalks with close planting, combining the technical requirements of the agronomy of close planting with wide and narrow row of cotton, a kind of row-controlled shoveling and drawing placement machine for cotton-stalks was designed based on the method of row-controlled and low-consumption shoveling and the principle of reverse pushing and drawing. The structure and working principle of the whole machine were briefly described. Combining with the requirements of the relevant operation performances, the structural parameters of the row-controlled shoveling device, the adjustment device of shoveling and the pushing-drawing roller that was tooth-shaped were determined through theoretical analysis and calculation, and the working parameters of the key components were analyzed. It was determined that the minimum shoveling angle of the shoveling device was 5.00°, the regulation range of shoveling angle was 5.00°~8.95°, and the range of rotational speed of the pushing-pulling roller with tooth type was 97.66~391.16 r/min. The field test results showed that the machine could realize many operations, such as pressing, shoveling, pulling and laying cotton-stalks, and had the function of separating soil. The parameters of the machine were adjusted. According to the depth of root system of cotton-stalks in the test field, when the shoveling depth of the row-controlled shoveling device was about 11.5 cm, the shoveling angle was about 7.1° and the rotational radius of the pushing-pulling roller with tooth type was 245 mm. When the working speed of machine was 2.76~3.39 km/h and the rotating speed of the pushing-pulling roller with tooth type was 156~174 r/min, the pulling rate was 90.87%~91.42%, and the productivity was 0.63~0.77 hm2/h. The row-controlled shoveling and drawing placement machine for cotton-stalks had stable operation performance, which can meet the design requirements of shoveling and drawing for whole stalks based on the agronomy of close planting. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 33
Main heading: Cotton
Controlled terms: Agronomy? - ?Rollers (machine components)
Uncontrolled terms: Analysis and calculations? - ?Industrial utilization? - ?Mechanized harvesting? - ?Operation performance? - ?Placement machine? - ?Structural parameter? - ?Technical requirement? - ?Working parameters
Classification code: 601.2 Machine Components? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products
Numerical data indexing: Rotational_Speed 1.56e+02RPM to 1.74e+02RPM, Rotational_Speed 9.77e+01RPM to 3.91e+02RPM, Size 1.15e-01m, Size 2.45e-01m, Velocity 7.67e-01m/s to 9.42e-01m/s
DOI: 10.6041/j.issn.1000-1298.2020.10.016
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
9. Design and Test of Pre-cutting and Spoon Seed-metering Device for Sugarcane
Accession number: 20204509472421
Title of translation:
Authors: Su, Wei (1); Hong, Fangwei (1); Lai, Qinghui (1); Jia, Guangxin (1); Chen, Ziwei (1)
Author affiliation: (1) Faculty of Agriculture and Food, Kunming University of Science and Technology, Kunming; 650500, China
Corresponding author: Lai, Qinghui(laiqinghui007@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 87-97
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to solve the problem of low degree of pre-cutting sugarcane planting machine in China and the problems such as the difficulty of filling-seed process, the serious missed seeds and the easy damage of seeds caused by the poor adaptability of sugarcane seed to seed-metering device with seed spoon, a kind of design and test of pre-cutting and spoon seed-metering device for sugarcane was designed. The elaboration on the operating principle of the role of seed spoon, downhill line improving the performance of type seed-metering device with seed spoon angle in every part of filling-seed was made, which through theoretical design and dynamic analysis of the structure of the seed spoon, using the steepest descent line and the inclination angle of the seed spoon to increase the filling speed of the seed spoon and improve the filling performance of the seed metering device. The basic parameters of seed spoon were obtained through the calculation of the kinematic analysis of theoretical calculation and filling-seed process in accordance with the physical characteristics within the seed itself. And through the analysis of the seeds of stress state and motion state in the course filling-seed, the basic parameters of seed metering device were obtained. To be specific, the single factor test was conducted through the EDEM discrete element simulation analysis, and the basic parameters of seed metering device were further ascertained by analyzing the influence of different structural parameters to filling-seed. Then the quadratic regression orthogonal rotation combination test was done, which was based on the single factor test. The quadratic regression orthogonal rotation combination test rotation rate of operating speed, seed metering device dip angle and seeds height were taken as the test factors, and the qualified-seeding index, the multiple-seeding index and the miss-seeding index were taken as the test index, the influence of the interaction of each test factor on the qualification rate was analyzed. After optimizing the test parameters, the qualification rate of the seed-metering device was 95.33%, the miss-seeding index and the multiple-seeding index were 3.11% and 1.56%, the best parameter combination was the seeds height of 360 mm, the operating speed of 1.45~2.37 km/h, the seed metering device dip angle of 9.53°~15.15°, the relative error between the test verification result and the simulation optimization result matched. The results showed that the pre-cutting and spoon seed-metering device for sugarcane could fully meet the sugarcane requirements of planting. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Seed
Controlled terms: Filling? - ?Optimization? - ?Pneumatic materials handling equipment? - ?Testing
Uncontrolled terms: Discrete element simulation? - ?Orthogonal rotations? - ?Parameter combination? - ?Physical characteristics? - ?Seed metering devices? - ?Simulation optimization? - ?Structural parameter? - ?Theoretical calculations
Classification code: 691.1 Materials Handling Equipment? - ?691.2 Materials Handling Methods? - ?821.4 Agricultural Products? - ?921.5 Optimization Techniques
Numerical data indexing: Percentage 1.56e+00%, Percentage 3.11e+00%, Percentage 9.53e+01%, Size 3.60e-01m, Velocity 4.03e-01m/s to 6.58e-01m/s
DOI: 10.6041/j.issn.1000-1298.2020.10.011
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
10. Optimization of Analytical Model and Prediction of Soil Compaction Stress Based on Stress Transmission Coefficient
Accession number: 20204509472769
Title of translation:
Authors: He, Tingfeng (1, 2); Ding, Qishuo (3); Zhang, Wei (1, 4); Jiang, Chunxia (1, 2); Liu, Enke (1, 2)
Author affiliation: (1) Institute of Organic Dry Farming of Shanxi, Shanxi Agricultural University, Taiyuan; 030000, China; (2) Organic Dry Farming of Shanxi Province Key Laboratory, Taiyuan; 030000, China; (3) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China; (4) National Local Joint Engineering Laboratory of Water-saving Techniques for Dry Farming in the Eastern Loess Plateau, Taiyuan; 030000, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 292-298
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Predicting soil stress with analytical models requires proper selection of the models’ concentration factor. The parameter is a coupled result from both loading condition and the soil environment. Stress transmission coefficient (denoted as STC) was suggested in other study to investigate the soil state’s effect on the concentration factor. Because the current limited-scale analytical approach of stress transmission coefficient may prevent accurate estimation of soil stress, there was a desperate need to make loading conditions’ impact clear on concentration factor. The function of the concentration factor was transformed and a theory to calculate the soil stress transmission coefficient in-situ soil in field, ΠSTC equation, was derived, which complement, associated with the stress transmission coefficient in a limited scale after splitting the soil profile from large. Totally nine loading conditions were tested using in-situ soil by controlling three plate diameters and three soil thicknesses, and a modified oedometer testing setup with a soil stress sensor was used to measure stress transmission coefficient of different soil layers (0~50 mm, 50~100 mm, 100~150 mm and 150~200 mm) in-door. Stress transmission coefficient for the same depths with field experiment was 0.30, 0.17 and 0.07, and then calculated by ΠSTC equation. Correlation analysis were performed to evaluate both measured and calculated STCs on controlled loading conditions (e.g. equivalent radius of the contact area and soil thickness). Then soil stress was predicted following the concentration factor back-calculated from the acquired STCs. The highly linear correlation between soil stress and applied surface stress indicated a stable STC for a particular soil state in field. In general, a thicker soil layer led to a decreased STC, and there was no significant difference in STCs varied with equivalent radius of the contact area, suggesting that the ΠSTC equation could be used as a specific method to quantify soil stress transmission in field. The back-calculation of concentration factor from measured STCs showed the details of how the concentration factor was affected by the changed loading condition with measured result. A good accuracy of the soil stress prediction based analytical model and ΠSTC equation meant a optimized solution was proposed for soil compacting stress prediction. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 41
Main heading: Stress analysis
Controlled terms: Analytical models? - ?Forecasting? - ?Predictive analytics? - ?Soil mechanics? - ?Soil testing? - ?Soils? - ?Stress measurement? - ?Transmissions
Uncontrolled terms: Accurate estimation? - ?Analytical approach? - ?Concentration factors? - ?Correlation analysis? - ?Modeling and predictions? - ?Modified oedometers? - ?Optimized solutions? - ?Stress transmission
Classification code: 483.1 Soils and Soil Mechanics? - ?602.2 Mechanical Transmissions? - ?921 Mathematics? - ?943.2 Mechanical Variables Measurements? - ?951 Materials Science
Numerical data indexing: Size 0.00e+00m to 5.00e-02m, Size 1.00e-01m to 1.50e-01m, Size 1.50e-01m to 2.00e-01m, Size 5.00e-02m to 1.00e-01m
DOI: 10.6041/j.issn.1000-1298.2020.10.033
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
11. Design and Experiment of Picking-up Mechanism of Axial-flow Full-feed Peanut Harvester
Accession number: 20204509472923
Title of translation:
Authors: Wang, Bokai (1); Gu, Fengwei (1); Yu, Zhaoyang (1); Cao, Mingzhu (1); Wang, Jiangtao (2); Hu, Zhichao (1)
Author affiliation: (1) Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing; 210014, China; (2) Henan Nongyouwang Agricultural Equipment Technology Co., Ltd., Zhumadian; 463100, China
Corresponding author: Hu, Zhichao(nfzhongzi@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 132-141 and 169
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Peanut is an important oil crop and cash crop in China. With the increasing uncertainties in international agricultural trade, efficient peanut harvesting equipment are playing a key role in maintaining the safety of China’s oil trade. Influenced by complex operation environment and multi-target reference system, the picking-up mechanism of axial-flow full-feed peanut combine harvester had the problems of high dropping rate, high damage rate and high power consumption rate. The key structural parameters and operation parameters of the picking mechanism were determined by combining theoretical analysis with field experiments. The theoretical range of the main parameters of the picking-up mechanism were established. Based on Box-Benhnken’s central combination theory, responsing surface tests were carried out with three factors as influencing factors, namely, mechanism rotation speed, machine advancing speed and elastic teeth spacing. The effects of various factors on picking-up and dropping rate, damage rate and power consumption rate were analyzed and the influencing factors were optimized. The significant order of dropping rate was: mechanism rotation speed, machine forward speed, and elastic teeth spacing. The significant order of pod damage rate was mechanism rotation speed, elastic teeth spacing and machine advancing speed. The significant order of influence of power consumption ratio was machine forward speed, mechanism rotation speed and elastic teeth spacing. The optimal combination of working parameters were the mechanism rotation speed of 63.62 r/min, the spacing between elastic teeth of 75.23 mm and the forward speed of the machine of 1.07 m/s, the corresponding dropping rate was 2.15%, picking-up loss rate was 3.53% and power consumption rate was 7.92%. The picking-up quality was improved and the harvesting cost was reduced. Results of the research could provide a reference for the perfect design of picking-up mechanism and optimization of operation parameters of axial-flow peanut full-feed harvester. The test device was based on the picking-up mechanism of axial peanut full-feed harvester, and the test object was only “Yuhua 9327” peanut variety. It was suggested that the picking performance should be discussed in depth under the conditions of different peanut varieties and peanut harvesting equipment with different structures. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 36
Main heading: Oilseeds
Controlled terms: Agricultural robots? - ?Axial flow? - ?Commerce? - ?Crops? - ?Electric power utilization? - ?Harvesters? - ?Harvesting? - ?Rotation? - ?Speed
Uncontrolled terms: Complex operations? - ?Different structure? - ?High power consumption? - ?Operation parameters? - ?Optimal combination? - ?Power consumption rates? - ?Structural parameter? - ?Working parameters
Classification code: 631.1 Fluid Flow, General? - ?706.1 Electric Power Systems? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?931.1 Mechanics
Numerical data indexing: Percentage 2.15e+00%, Percentage 3.53e+00%, Percentage 7.92e+00%, Rotational_Speed 6.36e+01RPM, Size 7.52e-02m, Velocity 1.07e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.10.015
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
12. Parameter Optimization and Test of Potato Harvester Wavy Sieve Based on EDEM
Accession number: 20204509473065
Title of translation:
Authors: Wei, Zhongcai (1, 2); Su, Guoliang (1, 2); Li, Xueqiang (2, 3); Wang, Faming (2, 3); Sun, Chuanzhu (2, 4); Meng, Pengxiang (2, 3)
Author affiliation: (1) School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo; 255091, China; (2) Shandong Provincial Intelligent Engineering and Technology Research Center for Potato Production Equipment, Dezhou; 253600, China; (3) Shandong Xicheng Agricultural Machinery Science and Technology Co., Ltd., Dezhou; 253600, China; (4) School of Mechanical Engineering, Shandong University of Technology, Zibo; 255091, China
Corresponding author: Sun, Chuanzhu(suncz@sdut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 109-122
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In consideration of the fact that the high rate of damage and bruising of potatoes is the bottleneck of potato harvest mechanization process, the potato’s damage and bruising mechanism, mainly including the impact and collision between potatoes and soil buffer production of potatoes, is not clear. Therefore, it is difficult to combine high efficiency separation with low loss harvesting, resulting in large economic losses, which limits the development of high-performance potato harvester. In the present work, the damage mechanism of potatoes was studied as key point, and the high efficiency, damage reduction and loss prevention in the potato harvesting process were taken as the research objectives. Under the condition of adapting to the planting pattern and agronomic characteristics in the north of China, the separation form of wavy separating sieve was proposed, and the separation mechanism of clods crushing and mechanical characteristics of potatoes on wavy separating sieve were clarified based on the discrete element method (DEM). It was found that the large inclination angle of wavy separating sieve was suitable for the small difference of wavy separating sieve running speed. Simultaneously, combined with the actual working condition of vibration separation, the separation form of damage control device of vibration and wavy separating sieve of potato harvester was optimized. It was demonstrated that the number of crest-trough on the wavy separating sieve in the second half of the separation sieve was two, that was, two wave crest and two wave trough. As a result, under the condition of the same separation distance stroke, when the wave screen surface inclination angle was large, it was suitable for the smaller separation screen operation speed. When the inclination angle on wavy separating sieve was 35°, the separation sieve running speed was 1.0 m/s, the damage and bruising rate of potatoes were 1.31% and 1.44%, respectively. When inclination angle on wavy separating sieve was 15° and the separation sieve running speed was 2.0 m/s, the damage and bruising rate of potatoes were 1.46% and 1.67%, respectively. It was noteworthy that the performance indexes of the damage control device of vibration and wavy separating sieve of potato harvester met the relevant standards. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 35
Main heading: Sieves
Controlled terms: Efficiency? - ?Finite difference method? - ?Harvesters? - ?Harvesting? - ?Losses? - ?Vibration control
Uncontrolled terms: Inclination angles? - ?Mechanical characteristics? - ?Parameter optimization? - ?Performance indices? - ?Research objectives? - ?Separation distances? - ?Separation mechanism? - ?Surface inclination angle
Classification code: 731.3 Specific Variables Control? - ?821.1 Agricultural Machinery and Equipment? - ?821.3 Agricultural Methods? - ?911.2 Industrial Economics? - ?913.1 Production Engineering? - ?921.6 Numerical Methods
Numerical data indexing: Percentage 1.31e+00%, Percentage 1.44e+00%, Percentage 1.46e+00%, Percentage 1.67e+00%, Velocity 1.00e+00m/s, Velocity 2.00e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.10.013
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
13. Design and Experiment of Roller-type Combined Longitudinal Axial Flow Flexible Threshing and Separating Device for Corn
Accession number: 20204509472912
Title of translation:
Authors: Chen, Meizhou (1); Xu, Guangfei (1); Wang, Chuanxu (1); Diao, Peisong (1); Zhang, Yinping (1); Niu, Guodong (1)
Author affiliation: (1) School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo; 255049, China
Corresponding author: Diao, Peisong(dps2003@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 123-131
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Corn grain harvesting has become the development trend of corn harvest in China. However, the grain harvesting mechanization is still backward in Huang-Huai-Hai region for the wheat-corn rotation planting pattern. The grain moisture content of corn is about 30% when harvesting. Its low level of the existing grain harvester is unable to meet the requirement of corn grain harvesting with higher moisture content. The broken grains for mechanical threshing are prone to mildew which even threaten food security. The high breaking rate and high un-threshing rate of the traditional threshing and separating device in Huang-Huai-Hai region have been the choke points of grain harvesting development. In order to solve these problems, the longitudinal axial flow flexible threshing and separating device was designed with the combined threshing element and roller-type combined threshing concave. The roller-type combined threshing concave with six-edged mesh sieve and fish scale threshing rubber roller was designed with different traditional concave plate. To verify the feasibility of low damage harvesting, the test device was built and the working mechanism was introduced in detail. Based on the theoretical analysis of the structure, three parameters, i.e. cylinder speed, transmission ratio between roller and cylinder and threshing clearance were chosen as the influence factors of test experiment. And the breaking rate and un-threshed rate could represent the threshing and separating performance. Reasonable variation rage of various factors was determined through single factor experiment. On this basis, three-factor and three-level orthogonal experiment was carried out. The results showed that the order of influence factors on the breaking rate and un-threshed rate was both cylinder speed, transmission ratio between roller and cylinder and threshing clearance. The optimal conditions were as below: the cylinder speed was 475 r/min, the transmission ratio between roller and cylinder was 1.5 and the threshing clearance was 45 mm. Under the above conditions, the breaking rate was 3.76% and the un-threshed rate was 0.52%. The verification test showed that this device had good threshing and separating performance, which can meet the requirement of the national standards in China. The research results can provide the references for low damage corn grain harvesting technology. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Grain (agricultural product)
Controlled terms: Axial flow? - ?Cylinders (shapes)? - ?Food supply? - ?Harvesting? - ?Moisture? - ?Moisture determination? - ?Rollers (machine components)? - ?Transmissions
Uncontrolled terms: Development trends? - ?Grain moisture content? - ?Optimal conditions? - ?Orthogonal experiment? - ?Single-factor experiments? - ?Threshing and separating? - ?Transmission ratios? - ?Verification tests
Classification code: 601.2 Machine Components? - ?602.2 Mechanical Transmissions? - ?631.1 Fluid Flow, General? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?822.3 Food Products? - ?944.2 Moisture Measurements
Numerical data indexing: Percentage 3.00e+01%, Percentage 3.76e+00%, Percentage 5.20e-01%, Rotational_Speed 4.75e+02RPM, Size 4.50e-02m
DOI: 10.6041/j.issn.1000-1298.2020.10.014
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
14. Design and Experiment of Flexible Mechanical Soybean Precision Seed-metering Device
Accession number: 20204509472650
Title of translation:
Authors: Hou, Shouyin (1); Zou, Zhen (1); Wei, Zhipeng (1); Zhu, Yifan (1); Chen, Haitao (1)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Chen, Haitao(htchen@neau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 77-86 and 108
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the problems that multiple floating debris like sand and broken straw are often sucked into seeding compartments by air-suction seed-metering devices during no-tillage sowing operations, causing lower seed metering quality, a flexible mechanical type soybean seed-metering device with seed-cleaning and maintaining functions was designed. Through a series of theoretical analyses of operation process of seed-metering device, the main structures and working parameters which might affect actual working performances were further determined. And by selecting PE wire, bristle and nylon as seed-protecting brush materials, a series of single-factor comparisons were conducted, it was showed that there was no significant difference between bristle and nylon in making effects on pass indexes. But PE wire had significant effects upon these pass indexes. As for effects on missed-sowing index and repeated-sowing index, there was no significant difference between nylon and bristle. However, PE wire achieved significant effect upon this index. For the damage index, there were significant differences between the above three materials. And through further comparative analyses, by selecting nylon as brush material, adopting 3-factor 5-level orthogonal revolving combination way and Design-Expert 8.0.6.1, taking operation speed, seed-filling inclination angle and seed-protection distance as test factors, as well as applying pass index, missed index, repeated index and damage index as evaluation indicators, the experimental data was further processed. It was showed that the actual effect degrees of all the above factors which made on pass index were operation speed, seed-protection distance and seed-filling inclination angle from the greatest to the least. Actual effects of all the above factors made on index missed-sowing index were seed-protection distance, seed-filling inclination angle and operation speed from the greatest to the least. And actual effects of all these factors made upon repeated-sowing index were operation speed, seed-filling inclination angle and seed-protection distance from the greatest to the least. And actual effects of all these above factors brought on damage index were seed-protection distance, operation speed and seed-filling inclination angle from the greatest to the least. When operating speed was 8~12 km/h, seed-filling inclination angle reached 70° and seed protection distance came to be -1.5 mm, such seed-metering device can pass 94% of total seeds, and missed-seeding index was less than 3%, missed-sowing index was less than 3%, and damage index was less than 0.2%, meeting the agronomic technical requirements for soybeans high-speed precision sowing under condition of no-tillage. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Wire
Controlled terms: Agriculture? - ?Air cleaners? - ?Damage detection? - ?Filling? - ?Petroleum reservoir evaluation? - ?Pneumatic materials handling equipment? - ?Polyamides? - ?Rayon? - ?Speed
Uncontrolled terms: Actual working performance? - ?Comparative analysis? - ?Evaluation indicators? - ?Inclination angles? - ?Precision seed-metering devices? - ?Seed metering devices? - ?Technical requirement? - ?Working parameters
Classification code: 451.2 Air Pollution Control? - ?512.1.2 Petroleum Deposits : Development Operations? - ?535.2 Metal Forming? - ?691.1 Materials Handling Equipment? - ?691.2 Materials Handling Methods? - ?815.1.1 Organic Polymers? - ?819.2 Synthetic Fibers? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Numerical data indexing: Percentage 9.40e+01%, Size -1.50e-03m, Velocity 2.22e+00m/s to 3.33e+00m/s, Percentage 2.00e-01%, Percentage 3.00e+00%
DOI: 10.6041/j.issn.1000-1298.2020.10.010
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
15. Simulation and Experiment on Flow Characteristics of Large Particles in Vortex Pump Based on DEM-CFD
Accession number: 20204509472385
Title of translation: DEM-CFD
Authors: Shi, Weidong (1); Shi, Ya (2); Gao, Xiongfa (2); Zhang, Desheng (2); Lang, Tao (2); Zhao, Ting (2)
Author affiliation: (1) School of Mechanical Engineering, Nantong University, Nantong; 226019, China; (2) Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang; 212013, China
Corresponding author: Gao, Xiongfa(gaofangjia@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 176-185
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In recent years, because the anti-clogging ability of swirl pump is better than that of ordinary pumps, it is gradually applied to more fields. However, when transporting sewage contains solids, it will still encounter problems such as half clogging, overwork wear, etc., so it is particularly important to master the flow characteristics of solid particles in the vortex pump. DEM-CFD coupling method was introduced into the numerical simulation of vortex pump. The movement law of particles in the pump was compared and analyzed when the vortex pump transported solid phase with different particle sizes and concentrations. The results showed that according to the experiment of rapeseed transportation by vortex pump, the calculated results of external characteristics were basically consistent with the experimental results. It was found that under the characteristics of the pump model, the particle rotation and flow caused by the circulation flow were more serious in the inlet pipe and the bladed area. The spiral flow from the chamber was reversed along the inlet wall, and the inlet flow was mixed with the reverse spiral flow to reach a balance. The experimental results were consistent with the numerical simulation results. It can be seen from the experiment that the calculation results of the pump performance were basically consistent with the experimental results, and it was found that the particle circulation and rotation phenomenon caused by the circulation flow existed in the inlet pipe, which was also one of the characteristics of the vortex pump and was consistent with the simulation phenomenon, which proved that the DEM-CFD coupling method had a certain reliability. It was found that there were three different modes of particle transportation in the swirl pump, the first was that particles flowed through the impeller and entered the volute, the second was that particles were directly thrown into the volute through the bladed cavity under the influence of circulation flow, and the third was that particles entered the impeller from the front end face area of the impeller and then entered the volute through the impeller. Through the analysis of internal flow characteristics of volute, it was found that the particles were mainly distributed at the back of the volute. From the diffusion section to the outlet area of the volute, the particles flowed out in a spiral way with the liquid, and the spiral vortices of different sizes were formed at the impeller side of the volute section. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Computational fluid dynamics
Controlled terms: Impellers? - ?Numerical methods? - ?Numerical models? - ?Particle size analysis? - ?Pumps? - ?Sewage? - ?Vortex flow
Uncontrolled terms: Calculation results? - ?Different particle sizes? - ?External characteristic? - ?Flow charac-teristics? - ?Internal flow characteristics? - ?Particle circulation? - ?Particle rotations? - ?Particle transportation
Classification code: 452.1 Sewage? - ?601.2 Machine Components? - ?618.2 Pumps? - ?631.1 Fluid Flow, General? - ?723.5 Computer Applications? - ?921 Mathematics? - ?921.6 Numerical Methods? - ?951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2020.10.020
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
16. Spatial Simulation of Sand-stabilization Ecosystem Service Based on HYSPLIT and PSCF model
Accession number: 20204509472366
Title of translation: HYSPLITPSCF
Authors: Su, Kai (1, 2); Wang, Jiping (1); Wang, Yinran (3); Guo, Hongqiong (2); Li, Song (2); Long, Qianqian (2)
Author affiliation: (1) Research Center of Saline and Alkali Land of State Forestry Administration, Chinese Academy of Forestry, Beijing; 100091, China; (2) Beijing Key Laboratory of Precision Forestry, Beijing Forestry University, Beijing; 100083, China; (3) Department of Geography, Taiwan University, Taipei; 10617, Taiwan
Corresponding author: Wang, Jiping(wjp_gis@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 232-242
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: For the northern farming-pastoral zone characterized by salinization effects and wind and sand activities, studying the spatial differences in ecosystem service functions and their rheological mechanisms can help to clarify the spatial relationship between service provision area (SPA) and service benefit area (SBA) and cross-regional ecological compensation schemes. The hybrid single-particle Lagrangian integrated trajectory (HYSPLIT) model and the potential source contribution function model (PSCF) were used to simulate the impact of the sand-stabilization ecosystem service (SSS) of the large-scale saline-alkali sand source area (dry saline-alkali lake in Angulinao) ecosystem on wind erosion and SBA. The radiation benefits in terms of land cover, population and gross domestic product (GDP) were determined, and cross-regional horizontal ecological compensation schemes were proposed based on the results of the radiation benefits. The results showed that the SSS of ecosystem in the study area was significant, and the amount of sand fixation reached 3.679 3 million tons; the transmission path of SSS extended to the east, mainly affecting North China and Northeast China. The land area of SBA was 1.893 7 million km2, accounting for 19.66% of the total area of China. The benefit scope included 15 provinces (cities and districts) such as Beijing, which was 41 167 times of the research area itself; the beneficiary population reached 527 million people, and the total benefited GDP was 28.37 trillion yuan; the ecological restoration of saline-alkali land in the study area reduced the amount of dust in the beneficiary areas by 1 471 700 t, and the direct economic benefit reached 4.426 billion yuan. The ecological compensation fund was jointly undertaken by 15 beneficiary provinces (cities and districts). Heilongjiang Province and Inner Mongolia Autonomous Region had the largest compensation amounts. Followed by Hebei Province, Jilin Province, Liaoning Province and other provinces, Zhejiang Province had to pay the least amount of ecological compensation. Based on the theory of ecosystem service flow, the SSS provision-transmission-benefit mechanism was analyzed, the quantitative relationship between SPA and SBA was studied, and the actual beneficiaries and benefits were determined. Through the application in dry saline-alkali lake in Zhangbei County, Hebei Province, this work can provide policy makers with a reference to promote ecological construction through horizontal ecological compensation and reduce the damage caused by soil wind erosion. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Ecosystems
Controlled terms: Erosion? - ?Lakes? - ?Sand? - ?Soils? - ?Stabilization? - ?Transmissions
Uncontrolled terms: Ecological compensation? - ?Ecological construction? - ?Ecological restoration? - ?Ecosystem service functions? - ?Gross domestic products? - ?Inner Mongolia autonomous regions? - ?Potential source contribution function models? - ?Spatial relationships
Classification code: 454.3 Ecology and Ecosystems? - ?483.1 Soils and Soil Mechanics? - ?602.2 Mechanical Transmissions
Numerical data indexing: Percentage 1.97e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.026
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
17. Effects of Single Application of Fertilizer on Yield and Nitrogen Utilization of Mulching Summer Maize
Accession number: 20204509473003
Title of translation:
Authors: Zhou, Changming (1); Li, Yuannong (2); Chen, Pengpeng (2)
Author affiliation: (1) College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang; 330045, China; (2) The Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling; 712100, China
Corresponding author: Li, Yuannong(liyuannong@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 329-337
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to reveal the effects of biodegradable film mulching with one-time fertilization on the yield and nitrogen use efficiency of summer maize, a field experiment was carried out in 2015 and 2016. Four treatments were designed, including one-time root zone fertilization (N1), one-time furrow fertilization (N2), one-time whole field fertilization (N3) and no fertilizer control treatment (CK). The results showed that the straw dry matter and grain dry matter mass under the three kinds of one-time fertilization treatments were all higher than that under CK control treatment, and the average grain dry matter mass under N1 treatment was increased by 14.75% and 4.98% compared with that under N3 and N2 respectively. The nitrogen absorption rate under N1 treatment was higher than that under N2 and N3 treatments, and there were significant differences between N2 and N3 during seedling stage to jointing stage and jointing stage to big trumpet stage. The nitrogen accumulation in summer maize ripening stage arranged from high to low was N1, N2 and N3. Compared with CK control, the yield under N3, N2 and N1 treatments was increased by 30.23%, 44.16% and 54.65% on average, respectively, and the yield under N1 treatment was higher than that under N2 and N3 treatments, and the average yield was increased by 18.75% compared with that under N3 treatment. The average nitrogen fertilizer partial productivity under N1 treatment was increased by 7.28% and 18.75% compared with that under N2 and N3, respectively, and the average apparent nitrogen utilization rate under N1 was increased by 30.61% and 88.28% compared with that under N2 and N3, respectively. Above all, one-time root zone fertilization treatment (N1) was advantageous to the concentration of nitrogen in soil plough horizon, which can improve the efficiency of nitrogen utilization in summer corn, and promote dry matter accumulation and yield of summer maize. It can also provide scientific basis and theoretical value for effective fertilization, reduction of nitrogen fertilizer pollution and improvement of fertilizer utilization efficiency under the cultivation mode of fully covered plastic film degradation in arid and semi-arid areas. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Nitrogen fertilizers
Controlled terms: Efficiency? - ?Grain (agricultural product)? - ?Soil pollution
Uncontrolled terms: Application of fertilizers? - ?Arid and semi-arid areas? - ?Dry matter accumulation? - ?Nitrogen absorption? - ?Nitrogen accumulation? - ?Nitrogen utilization? - ?Nitrogen-use efficiency? - ?Utilization efficiency
Classification code: 483.1 Soils and Soil Mechanics? - ?804 Chemical Products Generally? - ?821.4 Agricultural Products? - ?913.1 Production Engineering
Numerical data indexing: Percentage 1.48e+01%, Percentage 1.88e+01%, Percentage 3.02e+01%, Percentage 3.06e+01%, Percentage 4.42e+01%, Percentage 4.98e+00%, Percentage 5.46e+01%, Percentage 7.28e+00%, Percentage 8.83e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.037
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
18. Water-saving Irrigation Technology of Rice Based on Regulation of Depth of Saturated Soil
Accession number: 20204509472563
Title of translation:
Authors: Xu, Junzeng (1, 2); Cheng, Heng (1); Wei, Qi (1); Chen, Peng (1); Luan, Yajun (1); Cai, Shaojie (1)
Author affiliation: (1) College of Agricultural Science and Engineering, Hohai University, Nanjing; 210098, China; (2) State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing; 210098, China
Corresponding author: Wei, Qi(weiqi8855116@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 345-352
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Putting forward easily-observed and operate rice water-saving irrigation regulation indicators is of great significance to promote the large-scale application of rice water-saving irrigation technology. The method of pot experiment and model scenario simulation (Hydrus-1d) was used to study the variation of soil moisture and the depth of saturated soil during the drying and dehydration of paddy fields under different water intensities. The quantitative relationship between the soil moisture and the depth of saturated soil were established. The results show that the soil moisture and the depth of saturated soil during the paddy field dehydration had a good synchronous change law. The correlation coefficient between the measured soil moisture and the simulated soil moisture was 0.758 by using the Hydrus-1d model, which can better simulate the synchronous change of the two in the process of rice field dehydration. Both the experiment and the simulation results showed that there was a clear quadratic parabolic relationship between the soil moisture and the depth of saturated soil in the water-saving irrigation paddy field, that was, the depth of saturated soil was increased with the decrease of soil moisture in the process of rice field dehydration. In addition, based on the quantitative relationship between the two and the traditional critical value of soil moisture index, the critical value of the depth of saturated soil index was calculated, and the critical value of saturated soil depth in each growth period was ranged from 0.27 m to 0.50 m, forming a water-saving irrigation technology of rice with saturated soil depth as the control index. The technology used easily-observed depth of saturated soil as a control index, which overcame the problems of high monitoring cost and low measurement accuracy brought by using the soil moisture and a fixed number of days in an anhydrous layer as the control index, accurately reflecting the field moisture status, and at the same time, it met the needs of large-scale application of water-saving irrigation. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Soil surveys
Controlled terms: Dehydration? - ?Flow control? - ?Irrigation? - ?Soil moisture? - ?Water conservation
Uncontrolled terms: Correlation coefficient? - ?Large-scale applications? - ?Measurement accuracy? - ?Monitoring costs? - ?Rice water-saving irrigations? - ?Scenario simulations? - ?Soil moisture index? - ?Water-saving irrigation
Classification code: 444 Water Resources? - ?483.1 Soils and Soil Mechanics? - ?631.1 Fluid Flow, General? - ?802.2 Chemical Reactions? - ?821.3 Agricultural Methods
Numerical data indexing: Size 2.70e-01m to 5.00e-01m
DOI: 10.6041/j.issn.1000-1298.2020.10.039
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
19. Extraction Method of Corn Rhizome Navigation Lines Based on Edge Detection and Area Localization
Accession number: 20204509473064
Title of translation:
Authors: Gong, Jinliang (1); Wang, Xiangxiang (1); Zhang, Yanfei (2); Lan, Yubin (2)
Author affiliation: (1) School of Mechanical Engineering, Shandong University of Technology, Zibo; 255049, China; (2) School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo; 255049, China
Corresponding author: Zhang, Yanfei(1392076@sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 26-33
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on the corn rhizome image information, a corn field navigation line extraction method combining edge detection and area localization was proposed. Firstly, the 2G-R-B grayscale image was segmented and the binary image was obtained by using the maximum between-class variance. The morphological processing was combined with position/area denoising methods to improve the quality of the binary image and reduce the noise. The images were accumulated in columns to obtain the column pixel accumulation curve. The traditional method needed to set the distance threshold when extracted the feature points. Gaussian filter was used to smooth the accumulation curve and extreme value method was used to reduce the interference of pseudo feature points in maize roots and stems. When extracted the straight lines of corn stalk edges, a two-sided edge discrimination method was proposed based on the image width of the furthest stalk, and the pseudo-edge straight lines were effectively eliminated by scanning the closed quadrilateral neighborhood of each edge line. Finally, based on the straight line of the edge, the local area of the corn rhizome was relocalized and the false feature points were eliminated. The least-squares linear fitting method was used to accurately extract the navigation lines. The experimental results showed that the algorithm took about 236 ms to process a 1 280 pixels×720 pixels image, and the accuracy of feature point fitting was 92%. Compared with the traditional methods, the algorithm had the characteristics of high accuracy and good real-time performance. The algorithm was still more robust in the case of lack of seedlings, more weeds, and non-standard plant spacing. It can provide visual navigation for intelligent agricultural machinery to control corn diseases and insect pests. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Least squares approximations
Controlled terms: Agricultural robots? - ?Binary images? - ?Disease control? - ?Edge detection? - ?Extraction? - ?Image enhancement? - ?Navigation? - ?Pixels? - ?Plants (botany)? - ?Seed
Uncontrolled terms: Between-class variances? - ?Denoising methods? - ?Extraction method? - ?Gray-scale images? - ?Image information? - ?Morphological processing? - ?Real time performance? - ?Visual Navigation
Classification code: 723.2 Data Processing and Image Processing? - ?802.3 Chemical Operations? - ?821.4 Agricultural Products? - ?921.6 Numerical Methods
Numerical data indexing: Percentage 9.20e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.004
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
20. Cross-sensitivity of Land Use Transformation and Ecological Service Function in Shandong Province
Accession number: 20204509473028
Title of translation:
Authors: Lu, Chang (1); Han, Xiao (1); Han, Huiqin (1)
Author affiliation: (1) School of Management Engineering, Shandong Jianzhu University, Ji’nan; 250101, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 223-231
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In view of the unbalanced distribution of reserve resources for intensive land use, mismatch of supply and demand, deterioration of ecological environment, taking the 140 counties of Shandong Province as research units, the land use transformation and the spatiotemporal evolution characteristics of ecosystem services value were analyzed based on the remote sensing monitoring data of 2005, 2010 and 2015. Then, the improved cross-sensitivity model was used to explore the impact of land use transformation on the value of ecological services, and the sensitivity partition was divided. The results showed that during the study period, the transformation of land use structure in Shandong Province was obvious, the late stage was slowed down sharply, construction land continued to be expanded, and the contradiction between land supply and demand was further intensified; the difference of regional average value of ecological services in 2005-2015 was obvious, the Shizhong District and Weishan County were high-value areas; the Qingdao City and the Northwest Plain of Shandong Province were low-value areas; the transformation of farmland and waters to other land types was more sensitive to the impact of ecological service functions. The most sensitive transformation was from waters to wetlands, followed by the conversion of waters to construction land, farmland to construction land, and farmland to water. The transition of grasslands and deserts to other types of land was insensitive; ecosystem cross-sensitivity had obvious regional differences. The highly sensitive areas were concentrated in spatial distribution. The highly sensitive areas of farmland, forest and construction land were concentrated in Ji’nan City and Weihai City. The highly sensitive areas of farmland and water area were concentrated in the Yellow River Delta area. The research results can provide some scientific references and decision-making basis for optimizing the land use pattern of Shandong Province and protecting the ecological environment. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Land use
Controlled terms: Arid regions? - ?Decision making? - ?Deterioration? - ?Economics? - ?Ecosystems? - ?Farms? - ?Metadata? - ?Remote sensing
Uncontrolled terms: Ecological environments? - ?Ecosystem services value? - ?Regional differences? - ?Remote sensing monitoring? - ?Scientific references? - ?Spatiotemporal evolution? - ?Unbalanced distribution? - ?Yellow River Delta area
Classification code: 403 Urban and Regional Planning and Development? - ?443 Meteorology? - ?444 Water Resources? - ?454.3 Ecology and Ecosystems? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?912.2 Management? - ?951 Materials Science? - ?971 Social Sciences
DOI: 10.6041/j.issn.1000-1298.2020.10.025
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
21. Adaptability of Cavitation Flow Controlled by Active Jet under Multi-cavitation Conditions
Accession number: 20204509472975
Title of translation:
Authors: Wang, Wei (1, 2); An, Zhaoyang (1, 2); Tang, Tao (1, 2); Zhang, Qingdian (1, 2); Wang, Xiaofang (1, 2)
Author affiliation: (1) School of Energy and Power Engineering, Dalian University of Technology, Dalian; 116024, China; (2) Key Laboratory of Ocean Energy Utilization and Energy Conservation, Ministry of Education, Dalian University of Technology, Dalian; 116024, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 186-194
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Cavitation often causes noise, vibration and corrosion of hydraulic mechanical components such as ship propellers, pumps, and turbines, and causes the overall performance of the equipment to be greatly reduced, or even destroyed. Therefore, it is of great significance to carry out cavitation flow control. The method of arranging injection water holes on the suction side of the hydrofoil can effectively block the re-entrant jet to suppress cavitation. Through the high-speed visual flow field test technology, the cavitation morphology of NACA66 (MOD) original hydrofoil and jet hydrofoil surfaces was obtained. The influence of jet control parameters on cavitation suppression was studied, and the adaptability of active jet to cavitation flow control under varying operating conditions was analyzed. It was found that under different cavitation conditions, the active jet significantly reduced the cavity length around the suction surface of the hydrofoil, and the cavitation suppression effect was significant. When the jet coefficient and jet position were different, the effect of cavitation flow control was also different. In the cloud cavitation stage, the jet of 0.19 chord-length position from the leading edge of the hydrofoil (H1 model) can achieve the best cavitation suppression effect, and it was always better than that of the H2 model in the range of cavitation number σ≤1.28. In the sheet cavitation stage, σ>1.44, the jet of 0.45 chord-length position from the leading edge of the hydrofoil (H2 model) was more effective in suppressing cavitation. When the fixed jet position (H1 model) and jet flow rate (flow coefficient was 0.024 5), simplified flow control process, during the continuous development of cavitation (cavitation number was with 0.83≤σ≤1.46), the cavitation suppression effect was relatively stable, the deviation from the best suppression effect was within 0.06, which showed that the H1 model had good adaptability to working conditions. The research results provided a direction for exploring the active control technology of cavitation flow. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Cavitation
Controlled terms: Corrosion? - ?Flow control? - ?Hydraulic motors? - ?Hydrofoils? - ?Morphology? - ?Sailing vessels? - ?Ship propellers? - ?Ship propulsion? - ?Testing? - ?Vibrations (mechanical)
Uncontrolled terms: Active control technologies? - ?Cavitation conditions? - ?Continuous development? - ?Field test technologies? - ?Hydraulic mechanicals? - ?Hydrofoil surfaces? - ?Operating condition? - ?Suppression effects
Classification code: 631.1 Fluid Flow, General? - ?631.1.1 Liquid Dynamics? - ?632.2 Hydraulic Equipment and Machinery? - ?671.2 Ship Equipment? - ?674.1 Small Marine Craft? - ?675.1 Ship Propulsion (Before 1993, use code 671)? - ?931.1 Mechanics? - ?951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2020.10.021
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
22. Electro-hydraulic Proportional Control System of Hole Distance for Rape Seedling Rotary Tillage Combined Transplanter
Accession number: 20204509473007
Title of translation:
Authors: Tang, Qing (1); Wu, Chongyou (1); Wu, Jun (1); Qin, Chao (2); Jiang, Lan (1); Wang, Gang (1)
Author affiliation: (1) Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing; 210014, China; (2) School of Management and Engineering, Nanjing University, Nanjing; 210008, China
Corresponding author: Wu, Chongyou(542681935@qq.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 61-68
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The rape rotary tillage combined transplanter takes the tractor as power. As the PTO of tractor is fixed value, the planting speed of rape combined transplanter cannot change with the forward speed of tractor, which leads to the instability of the planting hole distance. A hole distance control system was designed, which was based on STM32 controller. The forward speed of tractor was detected by a ground wheel speed encoder. The speed of the hydraulic drive motor was adjusted by the electric proportional hydraulic system in real time. Generally, the real time matching of planting speed and forward speed was realized. The bench test of hole distance control system was developed. The test result showed that the hydraulic motor speed was consistent with the change trend of ground wheel speed, and the delay time was within 600 ms. Moreover, the hydraulic drive motor of the left and right two transplanting units had excellent synchronization, and the average speed error was 0.7%. The electro-hydraulic control system of hole distance was installed on the rape combined transplanter. Comparative field tests were conducted for four theoretical hole distances (150 mm, 160 mm, 170 mm, 180 mm) and four operating speeds (2 km/h, 3 km/h, 4 km/h and 5 km/h). The test result indicated that the transplanter had terrific hole distance stability. The primary and secondary factors affecting the consistency coefficient of variation were theoretical hole distance and forward speed. Theoretical hole distance had the most significant effect on the consistency of hole distance. When the hole distance was 160 mm, the consistency coefficient of variation of hole distance at different forward speed can keep a small value, which indicated that the hole distance of 160 mm was the most ideal hole distance. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Speed
Controlled terms: Agriculture? - ?Control systems? - ?Hydraulic drives? - ?Hydraulic motors? - ?Tractors (agricultural)? - ?Tractors (truck)? - ?Wheels
Uncontrolled terms: Consistency coefficient? - ?Electro-hydraulic control systems? - ?Electro-hydraulic proportional control systems? - ?Hydraulic system? - ?Operating speed? - ?Planting holes? - ?Real-time matching? - ?Rotary tillages
Classification code: 601.2 Machine Components? - ?632.2 Hydraulic Equipment and Machinery? - ?663.1 Heavy Duty Motor Vehicles? - ?731.1 Control Systems? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Numerical data indexing: Percentage 7.00e-01%, Size 1.50e-01m, Size 1.60e-01m, Size 1.70e-01m, Size 1.80e-01m, Time 6.00e-01s, Velocity 1.11e+00m/s, Velocity 1.39e+00m/s, Velocity 5.56e-01m/s, Velocity 8.33e-01m/s
DOI: 10.6041/j.issn.1000-1298.2020.10.008
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
23. Spatio-temporal Characteristics and Obstacle Diagnosis of Cultivated Land Ecological Security in “One River and Two Tributaries” Region in Tibet
Accession number: 20204509473067
Title of translation: ””
Authors: Li, Dan (1); Tian, Peipei (2); Luo, Hongying (3); Luo, Yufeng (1); Cui, Yuanlai (1)
Author affiliation: (1) State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan; 430072, China; (2) School of Renewable Energy, North China Electric Power University, Beijing; 102206, China; (3) School of Civil and Hydraulic Engineering, Xizang Agriculture and Animal Husbandry College, Linzhi; 860000, China
Corresponding author: Luo, Yufeng(yfluo@whu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 213-222
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In view of the challenges faced by the ecological security of cultivated land on the Qinghai-Tibet Plateau, an evaluation model for the ecological security of cultivated land in “one river and two tributaries” in Tibet was established to clarify the impact of agricultural development on the ecological security of cultivated land. The ecological security of cultivated land index system was proposed based on pressure-state-response (PSR) model, consisting of three elements and 13 indicators. The spatial and temporal change pattern of cultivated land ecological security from 1985 to 2013 was analyzed, and the obstacle factors of cultivated land ecological security in different regions were probed. Results showed that the intensity of agricultural development in the “one river and two tributaries” region of Tibet was relatively high, especially since 2000, when the application of chemical fertilizers and pesticides brought huge hidden dangers to ecological security. Before the 21th century, cultivated land ecological security in all counties was basically at the “excellent” level. From 2000 to 2010, the level of cultivated land ecological security in all counties was decreased and gradually changed to “poor”. Then, cultivated land ecological security was improved after 2010 and gradually recovered to “excellent” or “good”. The grade of cultivated land ecological security in the “one river and two tributaries” areas as a whole was relatively consistent, but the level of ecological security in a few counties was relatively backward. The obstacle factors of regional cultivated land ecological security both had a certain regional similarity and an obvious spatial heterogeneity. The application of nitrogen and phosphorus fertilizer was the main obstacle to the ecological security of cultivated land. The research result can reveal the historical and realistic state of the evolution of cultivated land ecological security in the plateau region and provide a basis for formulating differentiated ecological security regulation strategies. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 34
Main heading: Ecology
Controlled terms: Agricultural robots? - ?Agriculture? - ?Land use? - ?Nitrogen fertilizers? - ?Rivers
Uncontrolled terms: Agricultural development? - ?Nitrogen and phosphorus? - ?Pressure state response (PSR)? - ?Qinghai Tibet plateau? - ?Regional similarities? - ?Spatial and temporal changes? - ?Spatial heterogeneity? - ?Spatiotemporal characteristics
Classification code: 403 Urban and Regional Planning and Development? - ?454.3 Ecology and Ecosystems? - ?804 Chemical Products Generally? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI: 10.6041/j.issn.1000-1298.2020.10.024
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
24. Dissolved Oxygen Prediction Model Based on WT-CNN-LSTM
Accession number: 20204509472983
Title of translation: WT-CNN-LSTM
Authors: Chen, Yingyi (1, 2); Fang, Xiaomin (1, 3); Mei, Siyuan (1, 3); Yu, Huihui (4); Yang, Ling (1, 3)
Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, Beijing; 100083, China; (3) National Digital Fishery Innovation Center, Beijing; 100083, China; (4) College of Information, Beijing Forestry University, Beijing; 100083, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 284-291
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Dissolved oxygen (DO) plays an important role in aquaculture. It has the characteristics of changing with time, instability and nonlinearity, and it has too many influence factors with complex coupling relationship, and it is difficult to be predicted accurately. The traditional long short-time memory neural network (LSTM) is easy to introduce redundant data. And when it deals with long sequences, the gradient disappears so that it cannot capture very long term dependencies. To solve the problems above, the WT-CNN-LSTM prediction model was proposed. In view of the timing and nonlinearity of dissolved oxygen in aquaculture, the LSTM, which was widely used in time series prediction and had excellent performance, was selected to predict the dissolved oxygen value in two hours later. Aiming at the noise generated by environmental factors, human factors and system factors in the process of data collection, the hybrid wavelet transform (WT) was proposed to reduce noise in the data set so as to provide reliable support for the establishment of accurate prediction model. Moreover, due to the complex aquaculture environment, the dissolved oxygen content was affected by a variety of water quality factors and environmental factors. Therefore, the convolutional neural network (CNN) was used to mine and store the potential information between variables and DO in aquaculture. The result showed that WT-CNN-LSTM had good predictive performance. Its mean absolute error, root mean squared error and determination coefficient were 0.138, 0.229 and 0.954, respectively, which were optimized by 28.87%, 21.03% and 4.61% compared with those of the LSTM model. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Long short-term memory
Controlled terms: Aquaculture? - ?Complex networks? - ?Convolutional neural networks? - ?Dissolution? - ?Dissolved oxygen? - ?Forecasting? - ?Mean square error? - ?Predictive analytics? - ?Water quality? - ?Wavelet transforms
Uncontrolled terms: Determination coefficients? - ?Dissolved oxygen contents? - ?Environmental factors? - ?Long-term dependencies? - ?Predictive performance? - ?Root mean squared errors? - ?Time series prediction? - ?Water quality factor
Classification code: 445.2 Water Analysis? - ?722 Computer Systems and Equipment? - ?802.3 Chemical Operations? - ?821.3 Agricultural Methods? - ?921.3 Mathematical Transformations? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 2.10e+01%, Percentage 2.89e+01%, Percentage 4.61e+00%
DOI: 10.6041/j.issn.1000-1298.2020.10.032
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
25. Water Demand Model for Greenhouse Crops Considering Water Use Efficiency and Photosynthetic Rate
Accession number: 20204509472429
Title of translation:
Authors: Hu, Jin (1, 2); Long, Xingyue (1); Deng, Yifei (1); Wan, Xiangbei (1, 2); Li, Bin (1, 2); Wu, Huarui (3)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; 712100, China; (2) Key Laboratory of Agricultural Internet of Things, Ministry of Agriculture and Rural Affairs, Yangling; 712100, China; (3) National Agricultural Information Technology Research Center, Beijing; 100097, China
Corresponding author: Wu, Huarui(wuhr@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 362-370
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A method for building a water demand model that considered both water use efficiency (WUE) and photosynthetic rate for greenhouse crops was proposed. Firstly, a nested experiment was performed to measure the photosynthetic rate and WUE of tomato under different combinations of temperatures, photosynthetic photon flux densities (PPFD), CO2 concentrations and soil moisture. Secondly, the photosynthetic rate prediction model and WUE prediction model were established by using the radial basis function (RBF) algorithm. On this basis, the response curve of photosynthetic rate to soil moisture was obtained. Then, the optimal soil moisture ranges under certain environmental conditions were found by applying the U-chord discrete curvature algorithm and particle swarm optimization (PSO) algorithm. At last, the water demand model was established based on the support vector machine regression (SVR) algorithm. The results showed that the model was of high accuracy, with determination coefficient of 0.996 9, and mean square error of 0.23%. Compared with the water demand model that only considered photosynthetic rate, this model increased the WUE by 15.22% on average, while the soil moisture and the photosynthetic rate were decreased by 12.76% and 4.05% on average, respectively. These results proved that the crop water demand model proposed can take good account of both crop demand and agricultural water consumption, and provide a theoretical basis for the dynamic and efficient soil moisture regulation of greenhouse crops. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Predictive analytics
Controlled terms: Agricultural robots? - ?Crops? - ?Curve fitting? - ?Efficiency? - ?Greenhouses? - ?Mean square error? - ?Particle swarm optimization (PSO)? - ?Plants (botany)? - ?Soil moisture? - ?Support vector machines ? - ?Support vector regression? - ?Water supply
Uncontrolled terms: Determination coefficients? - ?Discrete curvatures? - ?Environmental conditions? - ?Particle swarm optimization algorithm? - ?Photosynthetic photon flux densities? - ?Radial Basis Function(RBF)? - ?Support vector machine regression (SVR)? - ?Water-use efficiency
Classification code: 446.1 Water Supply Systems? - ?483.1 Soils and Soil Mechanics? - ?723 Computer Software, Data Handling and Applications? - ?821.4 Agricultural Products? - ?821.6 Farm Buildings and Other Structures? - ?913.1 Production Engineering? - ?921.6 Numerical Methods? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 1.28e+01%, Percentage 1.52e+01%, Percentage 2.30e-01%, Percentage 4.05e+00%
DOI: 10.6041/j.issn.1000-1298.2020.10.041
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
26. Kinematics and Stiffness Modeling Analysis of Spatial 2T1R Parallel Mechanism with Zero Coupling Degree
Accession number: 20204509472492
Title of translation: 2T1R
Authors: Shen, Huiping (1); Zhu, Zhongqi (1); Meng, Qingmei (1); Wu, Guanglei (2); Deng, Jiaming (1)
Author affiliation: (1) Research Center for Advanced Mechanism Theory, Changzhou University, Changzhou; 213016, China; (2) School of Mechanical Engineering, Dalian University of Technology, Dalian; 116024, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 411-420
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: According to the theory and method of topological design of parallel mechanism(PM) based on position and orientation characteristic (POC) equation, a three degree of freedom two translation and one rotation (2T1R)spatial parallel mechanism with zero coupling degree and one redundant branch chain was proposed. The topological analysis and kinematics analysis of the PM were carried out. Because the coupling degree of the PM was zero, it was easy to solve the symbolic forward position solution, which verified the correctness of the forward and inverse kinematics solution. Three kinds of possible singular positions of the PM were analyzed, and the singular configuration diagram of the PM was drawn; the Cartesian stiffness model of each branch chain was established by using the virtual spring method, and the stiffness distribution diagram of each branch chain and the whole mechanism was obtained by using Matlab software. At the same time, the change trend of torsional stiffness and linear stiffness in Cartesian stiffness matrix was given and analyzed, and the influence of redundant branch chain on the overall stiffness performance was discussed. The results showed that the PM had symbolic positive position solution and partial motion decoupling characteristics, and its passive redundant branch chain can avoid singular position; improve the kinematic performance of the PM; increase the stiffness of the PM; and make the mechanism more flexible. The construction had a wider application. At the same time, it was verified that the overall stiffness performance of the PM can be increased by 22% by using the redundant branch chain. The research result provided a theoretical basis for the PM based pipe bender prototype design. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Stiffness matrix
Controlled terms: Degrees of freedom (mechanics)? - ?Inverse kinematics? - ?Inverse problems? - ?MATLAB? - ?Mechanisms? - ?Stiffness? - ?Topology
Uncontrolled terms: Forward and inverse kinematics? - ?Kinematic performance? - ?Position and orientations? - ?Singular configurations? - ?Spatial parallel mechanism? - ?Stiffness distributions? - ?Three degree of freedoms? - ?Topological analysis
Classification code: 601.3 Mechanisms? - ?921 Mathematics? - ?931.1 Mechanics? - ?951 Materials Science
Numerical data indexing: Percentage 2.20e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.047
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
27. Design and Experiment of Vehicle-borne Stabilized Platform Leveling System Based on Active Suspension
Accession number: 20204509472452
Title of translation:
Authors: Guo, Qinghe (1); Zhao, Dingxuan (1)
Author affiliation: (1) College of Mechanical Engineering, Yanshan University, Qinhuangdao; 066004, China
Corresponding author: Zhao, Dingxuan(zdx-yw@ysu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 403-410
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to solve the problems of poor flexibility and long leveling time of the current rigid outrigger leveling device, the vehicle-borne stabilized platform leveling system was designed based on active suspension. The system mainly included three-axle six-wheel vehicle chassis, inertial measurement unit, control system and hydraulic system. By the means of suspension interconnection, the six points support structure of the suspension cylinder to the vehicle platform was equivalent to three points support structure, and the height of the three support points were adjusted by the center fixed leveling algorithm, so as to realize the leveling control of the vehicle-borne stabilized platform. In order to verify the feasibility of the leveling system, the prototype was trial manufactured and experimented. The experiment included parking leveling experiment and driving leveling experiment. The parking leveling experiment included two kinds of experiment, one was based on the designed leveling system and the other was based on the original rigid outrigger leveling device of the prototype. The experimental results of the parking leveling showed that during parking leveling, it took about 5.5 s to adjust the platform pitch angle from 2.5° to horizontal state and the leveling process was smooth, and the leveling accuracy was 0.1°. Compared with the rigid outriggers, the designed leveling system had obvious advantages in leveling speed and leveling accuracy during the parking leveling. The driving leveling experiment also included two kinds of experiment: unilateral bridge leveling and bilateral bridge leveling. The experimental results of the driving leveling showed that when passing the unilateral bridge for leveling, the maximum platform inclination error was 0.58° and when passing the bilateral bridge for leveling, the maximum platform pitch error was 0.55°. The platform inclination error was small during the driving leveling process which can basically meet the requirements of actual job. It was proved that the vehicle-borne stabilized platform leveling system based on active suspension not only can ensure the leveling speed and leveling accuracy during the parking leveling, but also can realize the function of leveling while driving. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Suspensions (components)
Controlled terms: Active suspension systems? - ?Automobile manufacture? - ?Automobile suspensions? - ?Errors? - ?Fixed platforms? - ?Ground supports? - ?Hydraulic equipment
Uncontrolled terms: Active suspension? - ?Hydraulic system? - ?Inclination errors? - ?Inertial measurement unit? - ?Leveling process? - ?Stabilized platform? - ?Support structures? - ?Vehicle platforms
Classification code: 511.2 Oil Field Equipment? - ?601.2 Machine Components? - ?632.2 Hydraulic Equipment and Machinery? - ?662.1 Automobiles? - ?662.4 Automobile and Smaller Vehicle Components
DOI: 10.6041/j.issn.1000-1298.2020.10.046
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
28. Effect of Casein on Whey Protein Concentrate Self-assembling to Form Nano-fibril Polymers
Accession number: 20204509473072
Title of translation:
Authors: Xu, Honghua (1); Wang, Xin (1); Ju, Tingting (1); Ma, Caihong (1); Guan, Chen (1)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 395-402
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Proteins can self-assemble to form nano-fiber polymers under unconventional conditions. This kind of polymer structure given protein monomers and their conventional polymerization formed with high-level functional properties, but this self-assembly process was easily interfered by other proteins and destroyed the assembly and polymerization mode. The interaction of two main protein components in milk was explored, and the effect of casein (CN) on the self-assembly of whey protein concentrate (WPC) to form fibril polymers was studied, and the degree of interference of WPC by CN at different stages of self-assembly was analyzed. The results showed that incorporation of CN at different stages of fibril formation determined the structure and shape of the hybrid copolymer. The earlier CN was added, the more obvious the inhibitory effect on the fibril formation was. With the increase of CN concentration, the mixing time point of CN for the formation of fibril polymer was delated. Among them, the surface hydrophobic interaction and the formation of disulfide bonds promoted the polymerization of CN and WPC, which weakened the interaction between WPC itself, and then inhibited the self-assembly of WPC fibrils. This inhibition was particularly obvious when CN was mixed in the initial stage of fibril formation. The polymerization rate constant k and the polymerization ability of WPC and CN were increased and the polymerization between WPC was weakened. The formation of WPC fibril polymer was destroyed by the interference of CN. The results indicated that cow’s milk protein cannot form nano-fibril polymers due to the effect of CN in cow’s milk, but the casein in cow’s milk was removed, and mixed in the middle and late stages of WPC self-assembly polymerization did not affect the formation of nano-fibril polymer structure. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Dairies
Controlled terms: Casein? - ?Covalent bonds? - ?Dairy products? - ?Hydrophobicity? - ?Nanofibers? - ?Polymerization? - ?Proteins? - ?Rate constants? - ?Sulfur compounds
Uncontrolled terms: Functional properties? - ?Hydrophobic interactions? - ?Polymerization modes? - ?Polymerization rates? - ?Protein components? - ?Self assembly process? - ?Self-assembly polymerization? - ?Whey protein concentrate
Classification code: 761 Nanotechnology? - ?801.4 Physical Chemistry? - ?802.2 Chemical Reactions? - ?804.1 Organic Compounds? - ?815.2 Polymerization? - ?822.1 Food Products Plants and Equipment? - ?822.3 Food Products? - ?931.2 Physical Properties of Gases, Liquids and Solids? - ?933 Solid State Physics
DOI: 10.6041/j.issn.1000-1298.2020.10.045
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
29. Irrigation Water Resources Allocation in Jinxi Irrigation District Based on Agricultural Sustainability
Accession number: 20204509472621
Title of translation:
Authors: Xu, Yaowen (1); Wang, Yihan (1); Liang, Dongling (1); Fu, Qiang (1); Zhou, Yan (1); Chen, Xiaohua (2)
Author affiliation: (1) School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin; 150030, China; (2) School of Management, Harbin University of Science and Technology, Harbin; 150030, China
Corresponding author: Fu, Qiang(fuqiang0629@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 299-309
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore the method of promoting the agriculture sustainability in irrigation area under uncertainties through the optimization of irrigation water resources allocation, the methods of stochastic programming and multi-objective programming were used to carry out studies in Jinxi Irrigation Area in Heilongjiang Province and the following results were obtained: based on the optimization, the total irrigation water consumption was saved by 1.3×108 m3 to 3.9×108 m3 and the irrigation water productivity was increased by 0.85 kg/m3 to 1.01 kg/m3. At the same time, the agricultural economic benefitswas increased by 1.8×107 yuan to 6.9×108 yuan. The ecological water allocation was more than 4×107 m3 and the reduction value of agricultural pollutant was 1.28×104 ton to 3.13×104 ton, therefore, the degree of agricultural sustainability in irrigation areas was improved effectively. Otherwise, the benefits of economic, ecological and social among the optimized irrigation water resources allocation policies had obvious differences which was caused by the influence of uncertain factors on the agriculture sustainability. The comprehensive agriculture sustainability of the optimal water allocation policies was analyzed from the aspects of economics benefits, water resources allocation equity, agricultural water resources productivity, agricultural pollutant intensity, GWP and agricultural water resources utilization ratio. Based on the above analysis, the optimal water allocation scheme under each scenario can be determined. Moreover, the sustainability degrees of optimal scheme were all more than 0.4, which meant that the optimized water resource allocation scheme can effectively enhance agriculture sustainability by stabilizing grain yield, improving the efficiency of irrigation and protecting ecological environment in the irrigation areas. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Water management
Controlled terms: Agricultural robots? - ?Economic and social effects? - ?Economics? - ?Irrigation? - ?Multiobjective optimization? - ?Productivity? - ?Resource allocation? - ?Stochastic programming? - ?Stochastic systems? - ?Sustainable development ? - ?Water pollution? - ?Water supply
Uncontrolled terms: Agricultural pollutants? - ?Agricultural sustainability? - ?Agricultural water? - ?Ecological environments? - ?Irrigation districts? - ?Multiobjective programming? - ?Uncertain factors? - ?Water resources allocations
Classification code: 446.1 Water Supply Systems? - ?453 Water Pollution? - ?821.3 Agricultural Methods? - ?912.2 Management? - ?921.5 Optimization Techniques? - ?961 Systems Science? - ?971 Social Sciences
Numerical data indexing: Mass_Density 8.50e-01kg/m3 to 1.01e+00kg/m3
DOI: 10.6041/j.issn.1000-1298.2020.10.034
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
30. Design and Experiment of Epicyclic Train Structured Biomass Ring-die Briquetting Machine with Plunger Roller
Accession number: 20204509472368
Title of translation:
Authors: De, Xuehong (1); Wu, Guifang (1); Li, Nanding (1); Zhang, Jianchao (1); Guo, Wenbin (1); Li, Zhen (2)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Huhhot; 010020, China; (2) College of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou; 014010, China
Corresponding author: Wu, Guifang(wgfsara@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 379-386
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Targeting on the problems of high energy consumption and severe abrasion for conventional ring-die briquetting machine, a new method was put forward to densify the biomass materials and also a prototype machine of epicyclic gear train structured ring-die briquetting machine with plunger roller was designed. The prototype machine can effectively compress loose materials into pellets of certain density through pressing movement of plungers of roller into the forming channels of ring-die, which altogether resemble a mating pair of gears: the plungers of roller fitting into the channels of ring-die as a pair of gears meshing with each other. For a good adjustment to diverse biomass materials, the ratio of length to diameter of forming channels can be altered. Experiments were conducted upon the prototype machine with materials (sawdust) of particle size of 1~3 mm and 15% of moisture content at room temperature and 60 r/min of roller rotational speed. The test results with productivity of 115 kg/h, briquetting rate of 96.2%, bulk density of 1.05 g/cm3, mechanical durability of 97.5% and an overall power consumption of 45 kW?h/t all met the design requirements and hence the machine was proved to be satisfactorily workable, and at the same time, the energy consumption was reduced by 25.4% compared with that of the common ring-die press with similar specifications, while a 50% reduction of energy consumption was observed compared with the screw extrusion type briquetting machine. Furthermore, the wear of key components were considerably diminished and thus prolonged service life could be affirmatively expected. The biomass briquetting method can strongly support as a reference for the optimization of design and application of ring-die briquetting machine. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Rollers (machine components)
Controlled terms: Biomass? - ?Briquets? - ?Briquetting? - ?Durability? - ?Energy utilization? - ?Epicyclic gears? - ?Particle size? - ?Pressing (forming)
Uncontrolled terms: Biomass materials? - ?Design and application? - ?Epicyclic gear trains? - ?High energy consumption? - ?Mechanical durability? - ?Prototype machine? - ?Ratio of length to diameters? - ?Rotational speed
Classification code: 524 Solid Fuels? - ?525.3 Energy Utilization? - ?601.2 Machine Components
Numerical data indexing: Mass_Density 1.05e+03kg/m3, Mass_Flow_Rate 3.19e-02kg/s, Percentage 1.50e+01%, Percentage 2.54e+01%, Percentage 5.00e+01%, Percentage 9.62e+01%, Percentage 9.75e+01%, Rotational_Speed 6.00e+01RPM, Size 1.00e-03m to 3.00e-03m
DOI: 10.6041/j.issn.1000-1298.2020.10.043
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
31. Inversion Model of Soil Salt Content in Different Depths Based on Radar Remote Sensing
Accession number: 20204509472877
Title of translation:
Authors: Zhang, Zhitao (1, 2); Du, Yuyan (1); Lao, Congcong (1); Yang, Ning (1); Zhou, Yongcai (1); Yang, Yalong (1)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; 712100, China; (2) The key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 243-251
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With the aim to monitor the salinization of soil salt content timely and effectively, taking Shahaoqu District of Hetao Irrigation Area as study area, the Sentinel-1 image as a data source, synchronous acquisition different depths of soil salinity data, by combining the two groups of radar backscatter coefficient to build a variety of indices, by using gray correlation degree (GCD) index to exclude the index with strong collinearity, and partial least squares regression (PLSR), quantile regression (QR) and support vector machine regression (SVM) were used to construct soil salinity inversion models at different depths of 0~10 cm and 10~20 cm. The results showed that among the three regression methods the accuracy of SVM regression model was the highest, the model modeling set determination coefficient Rc2 and the validation set determination coefficient Rp2 were all above 0.4, the modeling set root mean square error RMSEc and the validation set root mean square error RMSEp were all less than 0.3%, QR regression model was the next, PISR regression model was the worst. At each inversion depth, the inversion accuracy of 0~10 cm was higher than that of 10~20 cm, among which the SVM inversion model was better than other models at 0~10 cm depth, Rc2 and Rp2 were 0.568 and 0.686, respectively, and RMSEc and RMSEp were 0.201% and 0.151%, respectively. The results could provide a reference for monitoring soil salinization in bare soil stage by radar remote sensing. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 35
Main heading: Support vector regression
Controlled terms: Least squares approximations? - ?Mean square error? - ?Radar? - ?Remote sensing? - ?Soils? - ?Support vector machines
Uncontrolled terms: Determination coefficients? - ?Gray correlation degrees? - ?Partial least squares regressions (PLSR)? - ?Quantile regression? - ?Radar remote sensing? - ?Root mean square errors? - ?Support vector machine regressions? - ?Synchronous acquisition
Classification code: 483.1 Soils and Soil Mechanics? - ?716.2 Radar Systems and Equipment? - ?723 Computer Software, Data Handling and Applications? - ?921.6 Numerical Methods? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 1.51e-01%, Percentage 2.01e-01%, Percentage 3.00e-01%, Size 0.00e+00m to 1.00e-01m, Size 1.00e-01m to 2.00e-01m
DOI: 10.6041/j.issn.1000-1298.2020.10.027
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
32. Investigation on Soil Water Flux Measurement System Based on Pyboard
Accession number: 20204509472857
Title of translation: Pyboard
Authors: Xu, Jinghui (1, 2); Wang, Yichen (1); Shao, Mingye (1); Lin, Lei (2)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; 712100, China; (2) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 338-344
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Soil water flux measurement is very important in agriculture, but there is currently no mature measurement equipment. Through technical analysis, a soil water flux sensor was designed using Pyboard control unit, MicroPython programming language and ADS1256 analog-to-digital conversion chip. By using Python software and Matplotlib functions in the Math library, the host computer software was designed. Through sensor function tests, soil thermal diffusion coefficient, volumetric heat capacity, thermal conductivity, and soil water flow measurement can be achieved. Four kinds of soil samples were selected for testing, and the calculated values were obtained according to the maximum dimensionless temperature difference (MDTD) method and the ratio (Td/Tu) method, which were compared with the actual water flow. The test results showed that the system had high measurement accuracy and stable operation. In the application of the method, the linearity between the calculation results of the two algorithms and the actual values was good. The determination coefficient R2 of the MDTD method of the four soils were 0.967 7, 0.979 8, 0.978 0 and 0.964 7, and the determination coefficient R2 of the Td/Tu method were 0.984 5, 0.998 5, 0.998 9 and 0.998 6, indicating that the system had good measurement accuracy. Through adaptability evaluation, the correlation between the calculated values of Td/Tu and actual values in the four soils was better, the error was lower, and the calculation results were better than the MDTD method, which provided guidance for the selection of system algorithms. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Soil surveys
Controlled terms: Agricultural robots? - ?Analog to digital conversion? - ?Computer programming? - ?Computer software? - ?Digital to analog conversion? - ?Flow measurement? - ?Flow of water? - ?Functions? - ?Hydraulics? - ?Soil moisture ? - ?Soil testing? - ?Specific heat? - ?Thermal conductivity
Uncontrolled terms: Adaptability evaluation? - ?Calculation results? - ?Determination coefficients? - ?Dimensionless temperatures? - ?Measurement accuracy? - ?Measurement equipment? - ?Technical analysis? - ?Volumetric heat capacity
Classification code: 483.1 Soils and Soil Mechanics? - ?631.1 Fluid Flow, General? - ?631.1.1 Liquid Dynamics? - ?632.1 Hydraulics? - ?641.1 Thermodynamics? - ?723 Computer Software, Data Handling and Applications? - ?921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2020.10.038
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
33. Recognition Method of Feeding Behavior of Multi-target Beef Cattle
Accession number: 20204509472667
Title of translation:
Authors: Zhang, Hongming (1, 2); Wu, Jie (1); Li, Yongheng (1); Li, Shuqin (1, 2); Wang, Hongyan (2, 3); Song, Rongjie (1)
Author affiliation: (1) College of Information Engineering, Northwest A&F University, Yangling; 712100, China; (2) Ningxia Smart Agricultural Industry Technology Collaborative Innovation Center, Yinchuan; 750004, China; (3) Western E Commerce Co., Ltd., Yinchuan; 750004, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 259-267
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on computer vision technology, the data of beef cattles’ feeding behavior can be obtained with the help of the existing system, and carrying out the correlation analysis with weight change, health status, etc. is of great significance for scientific beef breeding. A method of beef cattles’ feeding behavior recognition based on machine vision was proposed. YOLOv3 was used to detect the beef cattle targets in the observation range, and convolutional neural network was used to recognize the feeding behavior of single target, and then the recognition of feeding behavior of multi-target beef cattle was realized. In convolution operation, padding was used to enhance the network’s ability to extract the edge features of the target; the corrected linear units (ReLU) was used as the activation function to prevent the gradient from disappearing; the dropout method was used to improve the generalization ability of the network. Taking the actual beef cattle farm monitoring video as the research object, the experiment was carried out on eight test sets. The average precision of beef cattle target detection within the observation range was 83.8%, the average precision of feeding behavior recognition was 79.7%, the average recall rate was 73.0%, and the average accuracy rate was 74.3%, which can meet the monitoring of beef cattle feeding behavior. The multi-objective recognition method of beef cattle feeding behavior based on YOLOv3 and convolutional neural network had good accuracy, and provided a new way for non-contact monitoring of beef cattle behavior. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Beef
Controlled terms: Behavioral research? - ?Computer vision? - ?Convolution? - ?Convolutional neural networks? - ?Feeding
Uncontrolled terms: Activation functions? - ?Computer vision technology? - ?Correlation analysis? - ?Existing systems? - ?Feeding behavior? - ?Generalization ability? - ?Non-contact monitoring? - ?Recognition methods
Classification code: 691.2 Materials Handling Methods? - ?716.1 Information Theory and Signal Processing? - ?723.5 Computer Applications? - ?822.3 Food Products? - ?971 Social Sciences
Numerical data indexing: Percentage 7.30e+01%, Percentage 7.43e+01%, Percentage 7.97e+01%, Percentage 8.38e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.029
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
34. Optimal Energy Consumption Path Planning of UAV on Mountain Region Based on Simulated Annealing Algorithm
Accession number: 20204509472369
Title of translation:
Authors: Fan, Yeman (1, 2); Shen, Kaicheng (1, 2); Wang, Dong (1, 2); Zhai, Changyuan (3); Zhang, Haihui (1, 2)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; 712100, China; (2) Key Laboratory of Agricultural Internet of Things, Ministry of Agriculture and Rural Affairs, Yangling; 712100, China; (3) Beijing Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China
Corresponding author: Wang, Dong(wangdong510@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 34-41
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the operation efficiency of the unmanned aerial vehicle (UAV) on mountain region, the four-rotor UAV was used as the test object. The energy efficiency coefficients of the three-dimensional motion were proposed through the force analysis and simplification of the three-dimensional motion of the UAV. Then the performance of the UAV was tested and the correlation model between power and thrust was fitted with the coefficient of determination of 0.989 4. The energy efficiency coefficients under different load conditions were calculated on this basis. After that, the optimal energy consumption operation paths of UAV on mountain region were simulated based on the correspondingly designed simulated annealing algorithm (SAA). The test results showed that when the flying speed of the UAV was 2 m/s, under different constant loads, the optimal energy consumption paths can save up to 30.16% of the energy compared with the conventional paths, and 5.47% of the energy compared with the shortest paths; in the case of the real-time changing load, the optimal energy consumption path can save energy by 32.04% compared with the conventional path and save energy by 11.72% compared with the shortest path. It showed that under the constraint of energy consumption, the simulated annealing algorithm can optimize the operation path of the UAV to save energy, which was of great significance for improving the operation efficiency of the UAV on mountain region. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Unmanned aerial vehicles (UAV)
Controlled terms: Antennas? - ?Energy efficiency? - ?Energy utilization? - ?Graph theory? - ?Landforms? - ?Simulated annealing
Uncontrolled terms: Coefficient of determination? - ?Correlation modeling? - ?Efficiency coefficient? - ?Mountain regions? - ?Operation efficiencies? - ?Simulated annealing algorithm(SAA)? - ?Simulated annealing algorithms? - ?Three-dimensional motion
Classification code: 481.1 Geology? - ?525.2 Energy Conservation? - ?525.3 Energy Utilization? - ?537.1 Heat Treatment Processes? - ?652.1 Aircraft, General? - ?921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Numerical data indexing: Percentage 1.17e+01%, Percentage 3.02e+01%, Percentage 3.20e+01%, Percentage 5.47e+00%, Velocity 2.00e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.10.005
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
35. Improvement of Soy Protein Freeze-thaw Stability by Using Glycosylation Modification Based on Irradiation Field
Accession number: 20204509472657
Title of translation:
Authors: Wang, Xibo (1); Wang, Yuying (1); Zhou, Miao (1); Jiang, Shuo (1); Fu, Ling (1)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 387-394
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the freeze-thaw stability of soy protein, wet glycosylation modified soy protein isolate was tested in the irradiation field, and the modification process was optimized by using the degree of grafting and cream index as indicators. The results showed that the freeze-thaw stability of SPI prepared under the conditions of the mass ratio of soy protein isolate (SPI) and maltose (M) 4, SPI mass concentration 40 mg/mL, and irradiation dose 7.5 kGy was significantly improved. Compared with unmodified SPI, the emulsion cream index of the modified SPI after three freezing-thawing cycles was decreased by 22.98 percentage points, 28.40 percentage points and 30.70 percentage points, respectively, and the oiling off was decreased by 9.7 percentage points, 21.2 percentage points and 26.4 percentage points, respectively. Emulsifying activity index and emulsifying stability index were increased by 9.26 m2/g and 3.76 min, respectively, compared with that of unmodified SPI. Infrared spectroscopy analysis indicated that the maltose molecule was bound to soy protein isolate in the form of covalent bonds. Scanning electron microscopy showed that the microstructure of SPI-M irradiated was honeycomb and showed good water holding capacity. The results of optical microscopy showed that compared with the unmodified SPI emulsion, only small oil droplets appeared in the SPI-M emulsion after freeze-thaw treatment, and the emulsion state was more stable. The research result provided theoretical and technical reference for the production of soy protein with high freeze-thaw stability. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 39
Main heading: Emulsification
Controlled terms: Dairies? - ?Freezing? - ?Glycosylation? - ?Infrared spectroscopy? - ?Irradiation? - ?Maltose? - ?Proteins? - ?Scanning electron microscopy? - ?Stability? - ?Thawing
Uncontrolled terms: Emulsifying activity indices? - ?Emulsifying stabilities? - ?Freeze-thaw stability? - ?Freezing thawing cycles? - ?Mass concentration? - ?Modification process? - ?Soy protein isolates? - ?Water holding capacity
Classification code: 461.9 Biology? - ?802.3 Chemical Operations? - ?804.1 Organic Compounds? - ?822.1 Food Products Plants and Equipment
Numerical data indexing: Absorbed_Dose 7.50e+03Gy, Mass_Density 4.00e+01kg/m3, Specific_Surface_Area 9.26e+03m2/kg, Time 2.26e+02s
DOI: 10.6041/j.issn.1000-1298.2020.10.044
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
36. Fabrication of Self-sharpening Blades with Metalloceramics Materials and Low-damaged Cutting Mechanism of Alfalfa
Accession number: 20204509473040
Title of translation:
Authors: Song, Yuepeng (1, 2); Wang, Zheng (1, 2); Wu, Kun (1, 2); Li, Fade (1, 2); Song, Zhanhua (1, 2); Yang, Xiao (3)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Key Laboratory of Garden Machinery and Equipment, Shandong Agricultural University, Tai’an; 271018, China; (3) Institute of Physical and Chemical Technology, Chinese Academy of Sciences, Beijing; 100190, China
Corresponding author: Li, Fade(lifade@sdau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 421-426 and 309
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Through computer simulation, effects of edge curvature radius of blade on the mechanical properties during alfalfa cutting process were inspected. Metalloceramics functionally gradient material was fabricated by combustion synthesis casting under an ultra-gravity field. The structure of metalloceramics blades was prepared as national standard. Formation principle of self-sharpening characteristics and low-damaged mechanism cutting alfalfa for the metalloceramics blades were analyzed. Research results were verified by field experiment. The results indicated that edge curvature radius of blade was the key factor influencing the sharpness property. More value of radius was, blunter of the edge would be. According to stalk of alfalfa cut by blades, reducing cutting and increasing striking aspects would be existed. In the alfalfa growth direction (Z direction), enhanced tensile stress can accumulate the stalk, which can lead to some disadvantage such as coarse stubble of stalk, root loosen and so on. The flank surface of blades were made up of metalloceramics with preferentially oriented columnar eutectic matrix of iron/iron carbides for the high hardness (760~780 Hv) and wear resistance. Hardness gradient variation of rake face of blades can lead to regular wear. Self-sharpening characteristics, sharp cutting performance and low-damaged cutting alfalfa for metalloceramics blades were so formed because of slight variation for their edge structure. The results of field experiment indicated that in the same condition, after harvesting alfalfa plant for 66.7 hm2, compared with the commercial blades, the designed blades had excellent cutting performance: flush notches, slight damage of tissue, natural self-healing process, shorten regeneration period for 5 to 10 days and so on. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Metals
Controlled terms: Carbides? - ?Combustion synthesis? - ?Cutting tools? - ?Fabrication? - ?Hardness? - ?Iron compounds? - ?Wear of materials? - ?Wear resistance
Uncontrolled terms: Cutting mechanisms? - ?Cutting performance? - ?Damaged mechanism? - ?Functionally gradient materials? - ?Growth directions? - ?Hardness gradient? - ?National standard? - ?Self-healing process
Classification code: 603.2 Machine Tool Accessories? - ?642.1 Process Heating? - ?804.2 Inorganic Compounds? - ?931.2 Physical Properties of Gases, Liquids and Solids? - ?951 Materials Science
Numerical data indexing: Age 1.37e-02yr to 2.74e-02yr
DOI: 10.6041/j.issn.1000-1298.2020.10.048
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
37. Quality Inspection and Modeling for Crab Transportation
Accession number: 20204509472878
Title of translation:
Authors: Wang, Xiang (1, 2); Gao, Qianzhong (3); Xiao, Xinqing (1, 2); Fu, Zetian (1, 2); Zhang, Xiaoshuan (1, 2)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Food Quality and Safety Laboratory, China Agricultural University, Beijing; 100083, China; (3) Agricultural and Rural Bureau of the Guang’an, Guang’an; 638019, China
Corresponding author: Zhang, Xiaoshuan(zhxshuan@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 268-277
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In view of the rapid decline in nutrition during transportation of crabs and the serious loss of quality, the problem of effective monitoring is difficult. The bio-signal detection device was used to obtain the changes of gas and bioimpedance of crabs at 4, 15 and 25. The chemical experiment was used to detect the changes of volatile base nitrogen in crabs in the same environment. According to the change of sensory acquisition during crab storage, the quality change stage was roughly divided into three stages: fresh to sudden death (S1), sudden death to death (S2) and post-mortem corruption (S3). The BP neural network was optimized by genetic algorithm (GA), and the coupling model of impedance-volatile base nitrogen, gas-volatile base nitrogen and impedance-gas-volatile base nitrogen was established. The results showed that the prediction accuracy of the model at 4 was 96.93%, 86.32% and 98.77%, respectively. The prediction accuracy of S1 at 15 was 86.32%, 86.32% and 87.04%; S2 was 87.04%, 88.86% and 89.81%; S3 was at least 92.28%, 96.20% and 93.79%. The prediction accuracy of S1 at 25 was 88.86%, 87.04% and 91.23%; S2 was 86.32%, 87.72% and 93.79%; S3 was at least 89.81%, 89.35% and 86.32%, respectively. The coupling model basically met the needs of quality prediction of river crab. The quality of river crab can be predicted through the biological signals which was done by building the link between volatile compounds, biological impedance and chemical indexes. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 39
Main heading: Shellfish
Controlled terms: Backpropagation? - ?Forecasting? - ?Genetic algorithms? - ?Nitrogen? - ?Volatile organic compounds
Uncontrolled terms: Biological impedance? - ?Biological signals? - ?BP neural networks? - ?Coupling modeling? - ?Prediction accuracy? - ?Quality inspection? - ?Quality prediction? - ?Volatile compounds
Classification code: 461.9 Biology? - ?723.4 Artificial Intelligence? - ?804 Chemical Products Generally? - ?804.1 Organic Compounds
Numerical data indexing: Percentage 8.63e+01%, Percentage 8.70e+01%, Percentage 8.77e+01%, Percentage 8.89e+01%, Percentage 8.93e+01%, Percentage 8.98e+01%, Percentage 9.23e+01%, Percentage 9.38e+01%, Percentage 9.62e+01%, Percentage 9.69e+01%, Percentage 9.88e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.030
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
38. Analysis of Ordos Landscape Pattern and Spatial Optimization
Accession number: 20204509472620
Title of translation:
Authors: Hou, Hongbing (1, 2); Guo, Hongqiong (1); Yu, Qiang (1); Long, Qianqian (1); Pei, Yanru (1); Yue, Depeng (1)
Author affiliation: (1) Beijing Key Laboratory of Precision Forestry, Beijing Forestry University, Beijing; 100083, China; (2) Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang; 050061, China
Corresponding author: Yue, Depeng(yuedepeng@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 205-212 and 242
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Ordos City was chosen as a typical study area, landscape pattern data and meteorological and hydrological data from 2000, 2005, 2010, 2015 and 2018 were taken as the study material. Based on complex network theory, landscape ecology and GIS spatial analysis technology, the spatial and temporal landscape pattern evolution of Ordos and the water sources depth in various sub-watersheds were quantitatively analyzed. The data of landscape pattern evolution and ecological hydrology were coupled with the landscape ecological network constructed according to the multiple factors that determined the landscape characteristics, which provided reference for the landscape pattern optimization and ecological environment construction in the study area. The results showed that arable land in Ordos City was decreasing, woodland, grassland, waters and building land was increased to some extent over the study period. Landscape evolution occurred mainly between arable land, woodland and waters, with the most dramatic landscape evolution occurring in woodland and waters, and it was relatively stable in arable land, grassland and building land. The overall water retention capacity of Ordos region was low, with the eastern region relatively stronger than the western region. Over time, the high values were gradually shifted southward. There were 342 ecological nodes and 402 ecological corridors in the Ordos landscape ecological network, with 119 corridors added based on the strategy of adding edges with the lowest priority. The optimized network connectivity and connectivity robustness were significantly improved, and the ecological fluidity in the network was smooth. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Ecology
Controlled terms: Agriculture? - ?Complex networks? - ?Land use
Uncontrolled terms: Ecological environment constructions? - ?Ecological networks? - ?Hydrological data? - ?Landscape characteristic? - ?Landscape evolutions? - ?Network connectivity? - ?Spatial optimization? - ?Water retention capacity
Classification code: 403 Urban and Regional Planning and Development? - ?454.3 Ecology and Ecosystems? - ?722 Computer Systems and Equipment? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI: 10.6041/j.issn.1000-1298.2020.10.023
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
39. Inter-rows Navigation Method for Corn Crop Protection Vehicles under High Occlusion Environment
Accession number: 20204509472953
Title of translation:
Authors: Liu, Lu (1, 2); Pan, Yanjuan (1); Chen, Zhijian (1); Wang, Yuwei (1, 2); Li, Yawei (1); Chen, Liqing (1, 2)
Author affiliation: (1) College of Engineering, Anhui Agricultural University, Hefei; 230036, China; (2) Anhui Intelligent Agricultural Machinery Engineering Laboratory, Hefei; 230036, China
Corresponding author: Chen, Liqing(lqchen@ahau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 11-17
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The small agricultural vehicles can effectively solve the problem of pest control. However, in the middle and later stages of corn growing period, leaves crisscross between inter-rows would severely obstruct the passable region, which would lead great trouble for crop protection vehicles to pass between inter-rows. A passable region extraction method was proposed for crop protection vehicles, which used a 16-line LiDAR installed on the top of the vehicles as the sensing unit to collect the corn inter-rows information. The maize leaves were non-rigid obstacles. Touching the leaves as the robot travels did not cause crop damage. Through analyzing the three-dimensional point cloud data of corn along vehicle forward direction, and studying the distribution law of ground projection of leaves and trunks, the center point of maize point cloud obtained by K-means clustering estimation was taken as the main regional point. Then, the confidence interval was introduced to remove the estimated outlier clustering points in the corn trunk area, and the analysis accuracy was improved. Finally, the central navigation line of the corn crop row under high occlusion environment was analyzed. The experiment was carried out by simulating the real corn field scene. Compared with the trunk position of actual simulated corn, the maximum apparent distance error of the maize position identified by this method was 3.55 cm along both sides of the crop line. The average time of the current system perception response was 2 s, which satisfied the local positioning requirements of the 60 cm autonomous crop protection vehicles. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Crops
Controlled terms: Agricultural robots? - ?K-means clustering? - ?Robots? - ?Vehicles
Uncontrolled terms: Agricultural vehicles? - ?Analysis accuracy? - ?Central navigations? - ?Confidence interval? - ?Navigation methods? - ?Outlier clustering? - ?Region extraction? - ?Three-dimensional point clouds
Classification code: 731.5 Robotics? - ?821.4 Agricultural Products
Numerical data indexing: Size 3.55e-02m, Size 6.00e-01m, Time 2.00e+00s
DOI: 10.6041/j.issn.1000-1298.2020.10.002
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
40. Research and Application of Crop Diseases Detection Method Based on Transfer Learning
Accession number: 20204509472286
Title of translation:
Authors: Yu, Xiaodong (1, 2); Yang, Mengji (1, 2); Zhang, Haiqing (3); Li, Dan (1); Tang, Yiqian (1); Yu, Xi (1, 2)
Author affiliation: (1) College of Computer Science, Chengdu University, Chengdu; 610106, China; (2) Key Laboratory of Pattern Recognition and Intelligent Information Processing in Sichuan, Chengdu University, Chengdu; 610106, China; (3) School of Software Engineering, Chengdu University of Information Technology, Chengdu; 610225, China
Corresponding author: Yu, Xi(yuxi@cdu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 252-258
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Classifying the severity of crop diseases is the staple basic element of the plant pathology for making disease prevent and control strategies. In order to achieve better results in the classification of the severity (healthy, general or severe) of crop diseases, a CDCNNv2 algorithm based on residual network (ResNet 50) and deep transfer learning was proposed. By training more than 30, 000 crop disease images which were divided into 10 species, a model for the classification of disease severity was obtained, and the recognition accuracy could reach 91.51%. For verifying the robustness of the CDCNNv2 model, comparative experiments were carried out with ResNet 50, Xception, VGG16, VGG19 and DenseNet 121 that used transfer learning. The experimental results showed that the average accuracy of the CDCNNv2 model was increased by 2.78~10.93 percentage points, which had higher classification accuracy and strengthened the robustness of crop disease severity identification. At the same time, based on the model trained by this algorithm, combined with Android technology, a real-time and online crop diseases severity recognition APP was developed. By photographing the disease areas of the crop leaves, the recognition results (species-disease-severity) and recommendations for prevention and treatment can be obtained between 0.1 s and 0.5 s. In addition, other related supporting functions such as disease encyclopedia made the APP more complete, which can provide effective solutions and ideas for the prevention and treatment of crop diseases. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Disease control
Controlled terms: Crops? - ?Deep learning? - ?E-learning? - ?Learning systems? - ?Plants (botany)? - ?Transfer learning
Uncontrolled terms: Android technologies? - ?Classification accuracy? - ?Comparative experiments? - ?Control strategies? - ?Detection methods? - ?Effective solution? - ?Recognition accuracy? - ?Research and application
Classification code: 821.4 Agricultural Products
Numerical data indexing: Percentage 9.15e+01%, Time 1.00e-01s, Time 5.00e-01s
DOI: 10.6041/j.issn.1000-1298.2020.10.028
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
41. Design and Test of Compound Mechanical Automatic Aeration in Aquaculture
Accession number: 20204509473079
Title of translation:
Authors: Jiang, Jianming (1, 2); Qiao, Zengwei (1); Zhu, Zhengwei (1); Huan, Juan (1); Shi, Bing (1); Huan, Zhan (1)
Author affiliation: (1) School of Microelectronics and Control Engineering, Changzhou University, Changzhou; 213164, China; (2) Huaide College, Changzhou University, Jingjiang; 214500, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 278-283
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Large-scale and high-density is the development trend of aquaculture in China. The impeller aerator is the most important aerators for aquaculture in China, with a market share of over 80%. The biofan is an aeration machine introduced from Japan in recent years. It can circulate the water up and down with low power during the day, and the photosynthesis of algae in the water can greatly increase the dissolved oxygen concentration of the water. However, it was difficult for biofan to play the role of aeration in rainy days or at night, so it must be used together with other aeration machines. Variable factor and fixed factor fuzzy frequency conversion aeration control of impeller aerators was first studied. Through the experiment, it was found that the variable factor fuzzy frequency conversion control improved the dissolved oxygen concentration of the water body faster and the control was more stable in the rated area. Subsequently, the simultaneous operation of the biofan and impeller aerator was analyzed. In this working mode, the distribution of dissolved oxygen in the water of the breeding pond was not only uniform on the upper and lower layers, but also the whole water body absorbed more oxygen produced by algae photosynthesis. The biofan dispersed the water body with high dissolved oxygen content near the impeller aerator to improve the working efficiency of the impeller aerator. The combined use of biofan and impeller aerator can save 7.80 kW?h of electricity per day on sunny days and save 587.34 kW?h in the third quarter. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Dissolved oxygen
Controlled terms: Algae? - ?Aquaculture? - ?Biochemical oxygen demand? - ?Competition? - ?Dissolution? - ?Impellers? - ?Photosynthesis? - ?Salinity measurement
Uncontrolled terms: Aeration control? - ?Development trends? - ?Dissolved oxygen concentrations? - ?Dissolved oxygen contents? - ?Frequency conversion control? - ?Simultaneous operation? - ?Variable factors? - ?Working efficiency
Classification code: 601.2 Machine Components? - ?802.2 Chemical Reactions? - ?802.3 Chemical Operations? - ?821.3 Agricultural Methods? - ?911.2 Industrial Economics
Numerical data indexing: Percentage 8.00e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.031
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
42. Effect of Desulfurized Gypsum and Magnetized Water on Photosynthetic Characteristics of Buckwheat under Salt-alkali Stress
Accession number: 20204509472521
Title of translation:
Authors: Ning, Songrui (1); Zhao, Xue (1); Ji, Meiyue (1); Wang, Quanjiu (1)
Author affiliation: (1) State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an; 710048, China
Corresponding author: Wang, Quanjiu(wquanjiu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 310-317
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore the response and adaptation mechanisms of buckwheat photosynthesis to different improvement measures in saline-alkali soil, a pot experiment was set up to determine the photosynthetic light response characteristics of buckwheat under saline-alkali soil treated with desulfurized gypsum and magnetized water. With the aim to determine the optimal model which can calculate the photosynthetic characteristic parameters of buckwheat, the light response curves of buckwheat leaf were analyzed by the rectangular hyperbola model, non-rectangular hyperbola model and modified rectangular hyperbola model and exponential model. The results showed that the effect of irrigation with magnetized water on the photosynthetic characteristics of buckwheat was obvious, and the net photosynthetic rate was increased and then decreased with the increase of desulphurized gypsum application, under saline-alkali stress. The non-rectangular hyperbola model had the highest simulation accuracy and it can be used as the optimal model to describe the light response curve of buckwheat. Using the optimal light response curve model analysis showed that the photosynthetic characteristic parameters (e.g. dark respiration rate, apparent quantum efficiency, maximum photosynthetic rate, light compensation point, and light saturation point) of buckwheat were significantly higher than that of the other quantity processing in the application of 11 t/hm2 desulfurized gypsum. And buckwheat leaves enhanced the adaptive ability of light intensity and promoted accumulation of organic matter. In addition, irrigation with magnetized water could enhance photosynthetic light response of buckwheat. The research result provided a reference for the development of effective regulation methods to alleviate the effects of soil saline-alkali stress on crop growth. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 35
Main heading: Crops
Controlled terms: Gypsum? - ?Irrigation? - ?Saline water? - ?Soils
Uncontrolled terms: Adaptation mechanism? - ?Desulfurized gypsums? - ?Light compensation point? - ?Light response curves? - ?Net photosynthetic rate? - ?Photosynthetic characteristics? - ?Photosynthetic light? - ?Simulation accuracy
Classification code: 444 Water Resources? - ?482.2 Minerals? - ?483.1 Soils and Soil Mechanics? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2020.10.035
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
43. Design and Experiment of Dynamic Weighing System for Small Square Baler
Accession number: 20204509472863
Title of translation:
Authors: Zhang, Anqi (1); Meng, Zhijun (1); Chen, Liping (1); Wu, Guangwei (1); Cong, Yue (1); An, Xiaofei (1)
Author affiliation: (1) Beijing Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China
Corresponding author: An, Xiaofei(anxf@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 170-175 and 185
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the problems in the operation of small square baling machine, such as baling continuous, difficult dynamic separating and weighing a single bale, frequently rising and lifting of pickup, and ground up and down, a dynamic weighing system of square baling machine was designed based on multi-sensor fusion technology. A dynamic separation and identification method of bales was proposed by changing the track. A dynamic weighing system of straw bale based on real-time downforce and pitch angle of weighing platform was established. As a result, the dynamic independent weighing of single straw bale was realized. The system included mechanical part, sensor part, data acquisition module, satellite positioning module, display terminal and upper computer software. The sensor part includes four pressure-type weighing sensors, the tilt angle sensor of the weighing platform and the straw bale status identification sensor. The system could display real-time information such as pressure under weighing platform, pitch angle of weighing platform, bale weight, bale status, longitude and latitude, etc. In June 2020, the performance test of straw bale dynamic weighing system was carried out in Xiaotangshan National Precision Agriculture Research Base in Changping District, Beijing City. The results showed that the maximum relative error of the predicted bale weight in the static mode was 0.38%. In the dynamic mode, the R2 of the predicted bale weight and the true value reached 0.996, and the relative error range of the system predicted weight was -4.40%~4.30%. The results showed that the system had excellent accuracy and robustness, and the system could satisfy the practical needs of weighing grass bales in the field. The system provided a fast measurement method for the operation quality evaluation of baler. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Weighing
Controlled terms: Agricultural robots? - ?Computer software? - ?Data acquisition
Uncontrolled terms: Data acquisition modules? - ?Dynamic separation? - ?Maximum relative errors? - ?Multi-sensor fusion? - ?Performance tests? - ?Real-time information? - ?Satellite positioning modules? - ?Status identifications
Classification code: 723 Computer Software, Data Handling and Applications? - ?723.2 Data Processing and Image Processing? - ?943.3 Special Purpose Instruments
Numerical data indexing: Percentage 3.80e-01%
DOI: 10.6041/j.issn.1000-1298.2020.10.019
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
44. Design and Test of Clamping Belt Cotton Straw Harvester
Accession number: 20204509472568
Title of translation:
Authors: Cai, Jialin (1); Zhang, Jiaxi (1); Tiemuer, Yeerbolati (1); Gao, Zhouming (1); Rui, Zhaoyu (1); Liu, Xiong (1)
Author affiliation: (1) School of Mechanical and Electrical Engineering, Xinjiang Agricultural University, Urumqi; 830052, China
Corresponding author: Zhang, Jiaxi(13899961137@qq.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 152-160
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the problems of straw folding, rolling, pulling, rolling, cutting, rubbing and other problems in the process of cotton straw lifting, a double flexible belt wrapping and curved continuous drawing method was proposed for straw harvesting, and a belt was studied and designed. The cotton straw harvester with clips was composed of a hydraulic transmission system, a distributor, a belt clip traction device, a tension device and a rear three-point suspension device. The key part of the machine was the belt clamp tensioning device, which can be pulled out by winding the clamp. Through three factors and three levels of quadratic regression orthogonal test, the influence of different factors on the yield of cotton stalks was studied, and multiple quadratic regression models of missing and breaking rate response values were established, and the working parameters were optimized and on-site verified. The test was conducted. The optimal value was drive wheel speed of 272.3 r/min, the pull angle of 38.65°, the machine forward speed of 2.5 km/h, and the leakage rates and breaking rate of 1.85% and 7.72%, respectively. In the verification test, when the advancing speed was 2.5 km/h, the traction angle was 40°, and the driving wheel was 270 r/min, the leakage rate and breaking rate were 6.84% and 9.98%, which was basically consistent with the predicted value, and the mode was reasonable; various factors had a significant effect on the leakage rate of cotton straw. Gender order: machine forward speed, drive wheel speed and pull angle; important order: drive wheel speed, traction angle and machine forward speed. The research results can provide a theoretical basis for the subsequent structural improvement and performance improvement of the harvester with cotton stalks. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Cotton
Controlled terms: Belts? - ?Harvesters? - ?Regression analysis? - ?Speed? - ?Wheels
Uncontrolled terms: Design and tests? - ?Quadratic regression? - ?Research results? - ?Structural improvements? - ?Suspension devices? - ?Traction devices? - ?Verification tests? - ?Working parameters
Classification code: 601.2 Machine Components? - ?602.1 Mechanical Drives? - ?821.1 Agricultural Machinery and Equipment? - ?821.4 Agricultural Products? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 1.85e+00%, Percentage 6.84e+00%, Percentage 7.72e+00%, Percentage 9.98e+00%, Rotational_Speed 2.70e+02RPM, Rotational_Speed 2.72e+02RPM, Velocity 6.95e-01m/s
DOI: 10.6041/j.issn.1000-1298.2020.10.017
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
45. Review on Current State of Agricultural UAS Regulations and Standards
Accession number: 20204509472359
Title of translation:
Authors: Xue, Xinyu (1); Gu, Wei (1); Xu, Yang (1); Sun, Zhu (1); Lan, Yubin (2)
Author affiliation: (1) Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing; 210014, China; (2) College of Engineering, South China Agricultural University, Guangzhou; 510642, China
Corresponding author: Lan, Yubin(ylan@scau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 1-10
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In recent years, industry and application of agricultural unmanned aerial system (UAS) have been expanding rapidly and greatly. However, supporting regulations and standards on agricultural UAS are relatively lagging behind. The crucial standards formulating and implementing organizations and institutions in a global view, along with standards setting goals and basis were systematically reviewed. Agricultural UAS management organization, regulations and standards application in Japan were studied in detail. Current policies and regulations of industrial and agricultural UAS in China were also introduced, along with industry development and local standards. To lead the healthy development of UAS industry in China, regulation and standardization organizations at all levels keeping on UAS standardization work were concentrated on three aspects, including product (quality) standards, technical standards such as sub components and performance tests, operation specifications and personnel training management standards. All agricultural UAS standard construction works were led by Ministry of Agriculture and Rural Affairs, under the framework of Guidelines for Standardization Construction of Unmanned Aerial System. Proposed standards were not confined to plant-protection merely, which also included UAS application standards for fertilization, remote sensing, and auxiliary pollination and so on. Standards covering processes of production, circulation, application, training, registration and certification, should be established to support UAS management. Through scientific formulation and implementation of UAS standards, it would surely further regulate the industry development and drive independent innovation. Competitiveness of the agricultural UAS industry in the domestic and foreign markets would be enhanced. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 57
Main heading: Unmanned aerial vehicles (UAV)
Controlled terms: Agricultural robots? - ?Agriculture? - ?Antennas? - ?Competition? - ?Human resource management? - ?Personnel training? - ?Remote sensing? - ?Standardization
Uncontrolled terms: Agriculture and rural? - ?Independent innovation? - ?Industry development? - ?Management standards? - ?Performance tests? - ?Standard constructions? - ?Technical standards? - ?Unmanned aerial systems
Classification code: 652.1 Aircraft, General? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?902.2 Codes and Standards? - ?911.2 Industrial Economics? - ?912.4 Personnel
DOI: 10.6041/j.issn.1000-1298.2020.10.001
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
46. Detection of Rice Seedling Rows Based on Hough Transform of Feature Point Neighborhood
Accession number: 20204509472396
Title of translation: Hough
Authors: Wang, Shanshan (1, 2); Yu, Shanshan (2); Zhang, Wenyi (2); Wang, Xingsong (1)
Author affiliation: (1) School of Mechanical Engineering, Southeast University, Nanjing; 211189, China; (2) Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing; 210014, China
Corresponding author: Wang, Xingsong(xswang@seu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 18-25
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The detection of rice seedling rows is essential for precision agriculture and automatic navigation. A method based on Hough transform of feature point neighborhood was proposed to detect rice seedling rows, which can effectively solve the effects of weed distribution with different densities, different light intensities, curvature changes of seedling rows and other factors. The method had three main steps: the establishment of images database of rice seedling rows, feature point extraction of rice seedlings and the recognition of seedling row centerlines. Firstly, the image database of rice seedling rows under different light conditions (sunny and cloudy days), different weed density distributions and seedling growth status was established during the weed germination period; and then the object detection model based on Faster RCNN network was adopted to detect the positions of rice seedlings; finally, the proposed Hough transform algorithm based on the feature point neighborhood was used to recognize the center line of the seedling row. Experiments indicated that the proposed method had an average accuracy of 92% on the test set, and an average recognition accuracy of seedling rows less than 0.5° under high and low weed density distributions. It was not sensitive to isolated weed noise and light changes, and can also accurately recognize seedling rows with large curvatures. Therefore, the proposed method had good robustness and recognition accuracy. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Feature extraction
Controlled terms: Agricultural robots? - ?Distributed database systems? - ?Hough transforms? - ?Object detection? - ?Seed
Uncontrolled terms: Automatic navigation? - ?Detection models? - ?Different densities? - ?Different lights? - ?Feature point extraction? - ?Hough transform algorithms? - ?Recognition accuracy? - ?Seedling growth
Classification code: 723.2 Data Processing and Image Processing? - ?723.3 Database Systems? - ?821.4 Agricultural Products? - ?921.3 Mathematical Transformations
Numerical data indexing: Percentage 9.20e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.003
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
47. Optmization Design and Experiment on Eight-linkage Planting Mechanism of Dryland Transplanter
Accession number: 20204509472614
Title of translation:
Authors: Yin, Wenqing (1, 2); Liu, Haima (1); Hu, Fei (1); Yan, Hua (3); Guo, Dong (1); Wu, Ya’nan (1)
Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China; (2) Jiangsu Key Laboratory for Intelligent Agricultural Equipment, Nanjing; 210031, China; (3) Modern Agricultural Equipment Co., Ltd., Beijing; 100083, China
Corresponding author: Hu, Fei(hufei@njau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 51-60
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: It is often necessary to adjust the planting frequency and the speed of dryland trasplanters at the same time to meet the agronomic requirement of planting. An eight-linkage transplanter, consisted of crank-rocker mechanism, parallelogram amplification mechanism, swing slide mechanism and opening and closing mechanism, was designed to solve this problem. The mechanism of this eight-linkage transplanter was analyzed, and the motion model was also established. The influence of length on the verticle displacement, motion trail, velocity and acceleration of the mount point was researched. The influence of limit position angle and rocker swing angle were also researched. The optimized length of linkages were calculated by using Matlab GUI. And the finally length of linkages were l1=39 mm, l2=42 mm, l3=152.04 mm, l4=153.6 mm, l5=40 mm, l6=30 mm, l7=100 mm, l8=154 mm. According to the results of field experiments, the excellent rate of plant erectness could reach 94%, the total qualified rate could reach 96%, and the coefficient of variation of plant spacing could reach 3.25% by using the optimum length of levers. It could conclude that the eight-linkage planter had a good planting performance and could meet the agronomic requirements. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Agricultural machinery
Controlled terms: Agronomy? - ?Mechanisms
Uncontrolled terms: Amplification mechanism? - ?Coefficient of variation? - ?Crank-rocker mechanism? - ?Field experiment? - ?Limit positions? - ?Motion modeling? - ?Optimum length? - ?Slide mechanisms
Classification code: 601.3 Mechanisms? - ?821.1 Agricultural Machinery and Equipment? - ?821.3 Agricultural Methods
Numerical data indexing: Percentage 3.25e+00%, Percentage 9.40e+01%, Percentage 9.60e+01%
DOI: 10.6041/j.issn.1000-1298.2020.10.007
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
48. Village Classification Method Based on POI Data and Gravity Model
Accession number: 20204509472332
Title of translation: POI
Authors: Chen, Weiqiang (1); Dai, Yaqiang (1); Geng, Yiwei (1); Gao, Han (1); Ma, Yuehong (1)
Author affiliation: (1) College of Resources and Environment Sciences, Henan Agricultural University, Zhengzhou; 450002, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 10
Issue date: October 25, 2020
Publication year: 2020
Pages: 195-204
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Village classification is an important prerequisite for the implementation of the village revitalization plan. It is a scientific and rational allocation of public basic resources. It is of great theoretical and practical significance to carry out research on county village classification. A rural revitalization potential evaluation index system was built from five aspects: rural main body, location conditions, resource endowment, industrial foundation, and living network. The POI data and gravity model were used to analyze the spatial effect of the village. Finally, based on the evaluation results of rural revitalization potential and the spatial effects of villages, the villages were divided into four types of villages: urban-suburban integrated villages, agglomeration villages, scale-controlled villages, and relocated villages. The results showed that revitalization potential of rural in Xinzheng City was good, but the village development began to show a polarization. Xinzheng City had 28 urban-suburban integrated villages, 73 agglomeration villages, 78 relocated villages and 141 scale-controlled villages, each accounting for 8.75%, 22.81%, 24.38% and 44.06%, respectively. In general, the future rural revitalization and development of Xinzheng City should focus on the northwest and central southern regions, and it needed to implement policies by stages and proceed step by step. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Rural areas
Controlled terms: Agglomeration
Uncontrolled terms: Classification methods? - ?Evaluation results? - ?Gravity model? - ?Main bodies? - ?Potential evaluation? - ?Resource endowments? - ?Spatial effect? - ?Village development
Classification code: 802.3 Chemical Operations
Numerical data indexing: Percentage 2.28e+01%, Percentage 2.44e+01%, Percentage 4.41e+01%, Percentage 8.75e+00%
DOI: 10.6041/j.issn.1000-1298.2020.10.022
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
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