2020年第3期共收錄49篇
1. Effect of Blade Type on Energy Conversion of Vortex Pump
Accession number: 20201608417039
Title of translation:
Authors: Quan, Hui (1, 2); Guo, Ying (1); Yang, Yu’e (1); Cai, Ting (1); Chen, Xiangyu (1); Yu, Xinyang (1)
Author affiliation: (1) College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; (2) College of Engineering, Nihon University, Fukushima; 963-8642, Japan
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 123-129
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the problem that the blade type and energy loss of the vortex pump cause the whole machine efficiency to decline seriously, the model 150WX-200-20 vortex pump was taken as the research object, and the hydraulic and structural design of the vortex pump was carried out. The three-dimensional models of the forward-curved (R1-F2) and the backward-curved (F1-R2) blades were established by using Pro/E of three-dimensional design software. In this process, six groups of forward-curved (R1-F2) and backward-curved (F1-R2) blades were designed as control group. CFD of fluid calculation software was used for numerical calculation. Taking two kinds of blade deflecting as breakthrough point, combined with inlet and outlet velocity triangle of blade, the work process and energy loss process of different impellers of vortex pump were compared and analyzed. The energy loss transfer and transformation mechanism under these two different impeller types can be found. It was found that for the efficiency of vortex pump, the efficiency of forward-curved impeller was higher than that of backward-curved impeller before the design flow point, and after the design flow point, the efficiency of backward-curved impeller was higher than that of forward-curved impeller. For two different types of impellers, before the design flow point, the forward-curved blade had stronger function and less energy loss; after the design flow point, the backward-curved blade had stronger function and less energy loss. It was of great significance to the national agricultural development, and it had a certain reference value for the selection of the blade of vortex pump in the future. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Vortex flow
Controlled terms: Agricultural robots? - ?Computational fluid dynamics? - ?Energy conversion? - ?Energy dissipation? - ?Impellers? - ?Pumps? - ?Structural design
Uncontrolled terms: Agricultural development? - ?Breakthrough point? - ?Calculation software? - ?Numerical calculation? - ?Outlet velocities? - ?Three-dimensional designs? - ?Three-dimensional model? - ?Transformation mechanisms
Classification code: 408.1 Structural Design, General? - ?525.4 Energy Losses (industrial and residential)? - ?525.5 Energy Conversion Issues? - ?601.2 Machine Components? - ?618.2 Pumps? - ?631.1 Fluid Flow, General? - ?723.5 Computer Applications
DOI: 10.6041/j.issn.1000-1298.2020.03.014
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
2. Design and Experiment of Self-suction Mung Bean Precision Seed Metering Device
Accession number: 20201608417077
Title of translation:
Authors: Jia, Honglei (1, 2); Zhang, Shengwei (1); Chen, Tianyou (1); Zhao, Jiale (1, 2); Guo, Mingzhuo (1); Yuan, Hongfang (1, 2)
Author affiliation: (1) College of Biological and Agricultural Engineering, Jilin University, Changchun; 130025, China; (2) Key Laboratory of Bionics Engineering, Ministry of Education, Jilin University, Changchun; 130025, China
Corresponding author: Yuan, Hongfang(yhf1984828@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 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: Aiming to meet the requirement of precision seeding operations in hill sloping fields and decrease the impacts of rightward or leftward inclination of metering devices on seed-filling quality, a self-suction mung bean precision seed metering device was designed. The structural parameters of spoon-shaped holes were determined through analysis of seed forces. The structural parameters of reciprocating suction devices were determined through calculating the vacuum degree of adsorbed single seeds. Kinematic simulation of the reciprocating suction device on the multi-body dynamics software ADAMS uncovered the temporal curves of the piston displacement and velocity. Then the simulation results were validated to be reliable. The seed-filling layer height was fixed at 70 mm and the rotation speeds were fixed at 115 r/min and 125 r/min, while the right and left inclination angles were set at -12°, -6°, 0°, 6° or 12° (direction inclined to the seed chamber was negative). Comparison of three types of seed plates showed the spoon-shaped holes designed here facilitated the auxiliary seed filling under the left and right inclined status. Two-factor and five-level horizontal rotation combinations were designed and tested, involving factors of metering shaft rotation speed and filling layer height, and the indices of missing index, multiple index and qualified index. Then the test data were analyzed on Design-Expert. The missing index and qualified index were both more significantly affected by the metering shaft rotation speed than by the filling layer height. The multiple index was more considerably impacted by the filling layer height than by the metering shaft speed. At the metering shaft speed of 138 r/min and the filling layer height of 65 mm, the missing index, multiple index and qualified index were 2.97%, 3.43% and 93.58% respectively, which all met the national standards. The seed metering device can be referred during the design of precision seed metering devices in the future. Finally, the measured and predicted values of the regression model were obtained through the verification test. The relative error of the missing index was 4.4%, the relative error of the multiple index was 2.6%, and the relative error of the qualified index was 0.2%, which was basically consistent with the optimization result, proving the rationality of the regression model. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Filling
Controlled terms: Computer software? - ?Errors? - ?Kinematics? - ?Piston displacement? - ?Plants (botany)? - ?Pneumatic materials handling equipment? - ?Regression analysis? - ?Rotation? - ?Speed
Uncontrolled terms: Inclination angles? - ?Kinematic simulations? - ?Multi-body dynamic? - ?Precision seed-metering devices? - ?Precision seeding? - ?Seed metering devices? - ?Structural parameter? - ?Verification tests
Classification code: 612.1.1 Internal Combustion Engine Components? - ?691.1 Materials Handling Equipment? - ?691.2 Materials Handling Methods? - ?723 Computer Software, Data Handling and Applications? - ?922.2 Mathematical Statistics? - ?931.1 Mechanics
Numerical data indexing: Percentage 2.00e-01%, Percentage 2.60e+00%, Percentage 2.97e+00%, Percentage 3.43e+00%, Percentage 4.40e+00%, Percentage 9.36e+01%, Rotational_Speed 1.15e+02RPM, Rotational_Speed 1.25e+02RPM, Rotational_Speed 1.38e+02RPM, Size 6.50e-02m, Size 7.00e-02m
DOI: 10.6041/j.issn.1000-1298.2020.03.006
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
3. Performance Analysis of Proportional Relief Valve with Dynamic Pressure Feedback Pilot Chamber
Accession number: 20201608416979
Title of translation:
Authors: Chen, Chao (1)
Author affiliation: (1) Lonking (Shanghai) Machinery Co., Ltd., Shanghai; 201612, China
Corresponding author: Chen, Chao(cc@lonking.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 410-418
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The traditional proportional relief valve shows great pressure fluctuation and pressure deviation because the regulating spring stiffness is not enough under high pressure or large flow conditions, which makes the pressure regulating spring easy to fatigue and increase vibration and noise, it can reduce its life and reliability. The electro-hydraulic proportional relief valve with dynamic pressure feedback pilot chamber was studied based on G-type π bridge hydraulic resistance network, and the design method of hydraulic stiffness instead of spring stiffness of pilot valve was proposed, so it can improve response speed of the pilot valve core and stability to reduce pressure fluctuation and pressure deviation and there was no spring fatigue. Further structure and principle, theoretical modeling and simulation analysis of the new relief valve were carried out, the prototype was machined according to the optimized structure parameters and the dynamic and static characteristic of the new valve was verified by experiments. The results showed that the pressure deviation of the new relief valve was low under high pressure condition, especially it was 72% lower than that of traditional proportional relief valve and the minimum was 0.53 MPa when the inlet pressure was 26.25 MPa. In addition, it had good dynamic characteristics, the minimum pressure overshoot was 0.94%, and the spool vibration was decreased and worked smoothly. Finally, the relief valve was used in ZL50G loader to replace the relief valve and back pressure solenoid valve on the original moving arm oil circuit, and the influence of the relief valve on the operation of the working device under no-load condition was analyzed. The pressure fluctuation of the relief valve was reduced by 70% and the vibration and noise of the system were reduced. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Pressure relief valves
Controlled terms: Feedback? - ?Solenoid valves? - ?Stiffness
Uncontrolled terms: Dynamic characteristics? - ?Electro-hydraulic proportional relief valves? - ?High-pressure condition? - ?Hydraulic resistance networks? - ?Optimized structures? - ?Pressure fluctuation? - ?Static characteristic? - ?Theoretical modeling
Classification code: 601.2 Machine Components? - ?619 Pipes, Tanks and Accessories; Plant Engineering Generally? - ?731.1 Control Systems? - ?951 Materials Science
Numerical data indexing: Percentage 7.00e+01%, Percentage 7.20e+01%, Percentage 9.40e-01%, Pressure 2.62e+07Pa, Pressure 5.30e+05Pa
DOI: 10.6041/j.issn.1000-1298.2020.03.048
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
4. Path Planning for Autonomous Operation of Drone in Fields with Complex Boundaries
Accession number: 20201608416968
Title of translation:
Authors: Huang, Xiaomao (1); Zhang, Lei (1); Tang, Lie (2); Tang, Can (1); Li, Xiaoxia (3); He, Xiaowei (4)
Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) Department of Agricultural and Biosystems Engineering, Iowa State University, Ames; IA; 50011, United States; (3) College of Informatics, Huazhong Agricultural University, Wuhan; 430070, China; (4) Key Laboratory of Modern Agricultural Engineering, Tarim University, Alar; 843300, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 34-42
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to deal with the complexity of field boundaries for the agricultural drone application, an operation path planning algorithm with boundary universality was proposed and implemented for rotor based unmanned aircraft systems (UAS) to quickly obtain the flight trajectory for fields of all kinds of boundaries, including convex polygon, concave polygon, or even polygon with holes and multiple polygons. Firstly, the storage rule of vertex data of boundary polygon of field was specified, and the polygon of different fields was distinguished based on the polygon grouping method of the region representation rule, and the path planning was performed according to each field block individually. Secondly, operation route was obtained based on the scanning and filling lines of the polygon. For a single field block with a given flight direction, the initial scanning lines for both outer and inner boundary polygons were figured out quickly by using the active edge table method, and then the logic Boolean operation of “subtraction” was applied to the two sets of scanning lines. Then the route was optimized for high efficiency with the minimum energy and time. Taking the minimum inter-route jump distance as the optimization target, introducing “greedy algorithm”, “convex polygon minimum span method” and “step rotation method”, by using the greedy algorithm to address the route sequencing optimization which can be formulated as travelling salesman problem (TSP). The direction optimization was dealt with the convex polygon minimum span method or the step rotation method selectively according to different characteristics of the field boundary. Furthermore, the safety judgment and processing algorithm for the transfer process between different routes were proposed and implemented in order to expand the application scenarios as multiple fields with obstacles whose height influence cannot be ignored. Based on multiple sets of algorithms tests and simulation using both imaginary plots and actual plot boundaries, the results showed that the designed algorithm can process fields of various types of complex boundary with high operational reliability and fast processing speed. The processing time varied from 15 ms to 19.2 s, and the inter-route transfer distance optimization effect varied from 23.04% to 45.98% when ignoring the obstacles’ influence. And the consumed times were also acceptable when considering height influence of obstacles. The versatility, reliability, efficiency and optimization effect of the algorithm can meet the relevant requirements of agricultural drone operations in fields of all kinds of complex boundaries. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Motion planning
Controlled terms: Agricultural robots? - ?Agriculture? - ?Digital storage? - ?Drones? - ?Geometry? - ?Scanning? - ?Traveling salesman problem
Uncontrolled terms: Application scenario? - ?Autonomous operations? - ?Operational reliability? - ?Optimization effects? - ?Path-planning algorithm? - ?Processing algorithms? - ?Travelling salesman problem (TSP)? - ?Unmanned aircraft system
Classification code: 722.1 Data Storage, Equipment and Techniques? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?921 Mathematics? - ?921.5 Optimization Techniques
Numerical data indexing: Percentage 2.30e+01% to 4.60e+01%, Time 1.50e-02s to 1.92e+01s
DOI: 10.6041/j.issn.1000-1298.2020.03.004
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
5. Multi-source Spaceborne SAR Image Fusion Based on RNMU and Land Cover Classification
Accession number: 20201608417079
Title of translation: RNMUSAR
Authors: Li, Li (1, 2); Chen, Qiqi (1); Zhang, Chao (1, 2); You, Shucheng (3); Wei, Hai (3); Fu, Xue (4)
Author affiliation: (1) College of Land Science and Technology, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Remote Sensing for Agri-Hazards, Ministry of Agriculture and Rural Affairs, Beijing; 100083, China; (3) China Land Survey and Planning Institute, Beijing; 100035, China; (4) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China
Corresponding author: Zhang, Chao(zhangchaobj@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: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 191-200
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to take full advantage of the backward scattering characteristics for different land cover types in different temporal and polarization SAR data, the recursive nonnegative matrix underapproximation (RNMU) was used for the fusion of multi-source SAR data, and the fused SAR image was used to achieve a high-precision land cover classification. According to the characteristics of different SAR image modes, the input SAR images were pre-processed firstly, and then the matrix decomposition of the SAR images and the iterative solution of the optimal matrix were implemented based on RNMU. To verify the effect of application of integrated SAR image on land cover classification, taking Da’an City in Jilin Province as an example, RNMU was used for the fusion of multi-temporal VV/VH dual-polarization Sentinle-1 SAR image and HH/HV dual-polarization GF-3 data. The main types of land cover in the study area were classified with the fused SAR data based on RNMU. The results illustrated that SAR data fused based on RNMU algorithm had sound performance in the land cover classification with 93.11% overall accuracy and 0.86 Kappa coefficient, which outperformed the Gram-Schmid (G-S) fusion method with 6.83 percentage points and 0.12 higher in overall accuracy and Kappa coefficient respectively. The attempt of multi-source SAR fusion provided an effective means for SAR image fusion and provided more high-precision data resources for land cover classification. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 34
Main heading: Radar imaging
Controlled terms: Image classification? - ?Image fusion? - ?Iterative methods? - ?Matrix algebra? - ?Polarization? - ?Synthetic aperture radar
Uncontrolled terms: Backward scattering? - ?Dual-polarizations? - ?Iterative solutions? - ?Land cover classification? - ?Matrix decomposition? - ?Non-negative matrix? - ?Overall accuracies? - ?Under-approximation
Classification code: 716.2 Radar Systems and Equipment? - ?723.2 Data Processing and Image Processing? - ?921.1 Algebra? - ?921.6 Numerical Methods
Numerical data indexing: Percentage 9.31e+01%
DOI: 10.6041/j.issn.1000-1298.2020.03.022
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
6. Structural Design and Pressure Change Characteristics of Digital Hydraulic Transformer
Accession number: 20201608416941
Title of translation:
Authors: Zhang, Zhuxin (1, 2); Li, Weijian (1, 2); Liu, Tao (1, 2); Zhao, Dingxuan (1, 2); Sun, Renfu (1, 3); Han, Yan (1, 3)
Author affiliation: (1) College of Mechanical Engineering, Yanshan University, Qinhuangdao; 066004, China; (2) Hebei Key Laboratory of Special Delivery Equipment, Yanshan University, Qinhuangdao; 066004, China; (3) Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao; 066004, China
Corresponding author: Liu, Tao(liutao@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: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 402-409
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A new type of digital hydraulic transformer was designed by using several basic components such as gear pump/motor units and control valve groups. The digital hydraulic transformer combined the discrete, simple and easy to control characteristics of digital components, and was grouped by a plurality of gear pump/motor units with different displacements. Rigid connection was made between the drive gear shaft of each gear pump/motor to achieve the purpose of synchronous rotation. Solenoid switch valves were installed respectively through the integrated valve blocks at the inlet and outlet of each gear pump/motor unit, throttle valve was installed in the output port of the digital hydraulic transformer to simulate the load of the whole hydraulic system, the low pressure ports of the inlet and outlet control valve groups were connected together to access the oil tank. According to the binary digital control by changing the power on/off state of the inlet and outlet valve groups, the digital hydraulic transformer can realize the change of output flow due to the existence of low pressure oil port, and then realized the change of output pressure. The AMESim simulation software was used to analyze the pressure change process of the digital hydraulic transformer, and the digital hydraulic transformer was verified by using the test platform. The results showed that the proposed digital hydraulic transformer can change the output pressure by digital control, and the feasibility of the pressure change principle was determined. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Oil filled transformers
Controlled terms: Digital control systems? - ?Electric transformer testing? - ?Gear pumps? - ?Hydraulic equipment? - ?Oil tanks? - ?Safety valves? - ?Simulation platform? - ?Software testing? - ?Solenoid valves? - ?Structural design
Uncontrolled terms: Control characteristics? - ?Digital components? - ?Digital hydraulics? - ?Hydraulic system? - ?Power on/off state? - ?Rigid connection? - ?Simulation software? - ?Synchronous rotation
Classification code: 408.1 Structural Design, General? - ?523 Liquid Fuels? - ?618.2 Pumps? - ?619 Pipes, Tanks and Accessories; Plant Engineering Generally? - ?619.1.1 Pipe Accessories? - ?632.2 Hydraulic Equipment and Machinery? - ?704.2 Electric Equipment? - ?723.5 Computer Applications? - ?731.1 Control Systems
DOI: 10.6041/j.issn.1000-1298.2020.03.047
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
7. Image Segmentation for Tomato Plants at Night Based on Improved PCNN
Accession number: 20201608417066
Title of translation: PCNN
Authors: Xiang, Rong (1); Zhang, Jielan (1)
Author affiliation: (1) College of Quality and Safety Engineering, China Jiliang University, Hangzhou; 310018, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 130-137
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to realize the image segmentation for tomato plants at night, an improved pulse coupled neural network (PCNN) image segmentation algorithm was designed based on the maximum inter-group variance method. The algorithm weighted the link input in the traditional PCNN model. Before the image segmentation, the threshold was obtained based on the maximum inter-class variance (Otsu) algorithm, and then the threshold was assigned to the weight of the link input, the synaptic link coefficient, the link weight amplification factor and the threshold iterative decay time constant in the improved PCNN model. The results of 849 images of tomato plants at night showed that the average segmentation accuracy was 90.43% and the average segmentation time of one image was 0.994 4 s. The weighted processing of the link input could reduce the number of the iterations of improved PCNN and improve the real-time performance of the algorithm. Based on the Otsu algorithm, the network parameters can be set adaptively in the improved PCNN model. The comparative analysis based on the visual evaluation, the maximum entropy and the segmentation accuracy rate showed that the segmentation effect of improved PCNN model was better than those of the Otsu algorithm and the traditional PCNN model, and its real-time performance was also better than that of the traditional PCNN model. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Image segmentation
Controlled terms: Fruits? - ?Image enhancement? - ?Iterative methods? - ?Maximum entropy methods? - ?Neural networks
Uncontrolled terms: Amplification factors? - ?Comparative analysis? - ?Decay time constant? - ?Image segmentation algorithm? - ?Network parameters? - ?Pulse coupled neural network? - ?Real time performance? - ?Segmentation accuracy
Classification code: 716.1 Information Theory and Signal Processing? - ?821.4 Agricultural Products? - ?921.6 Numerical Methods
Numerical data indexing: Percentage 9.04e+01%
DOI: 10.6041/j.issn.1000-1298.2020.03.015
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
8. Quantitative Analysis of Response of Potato Main Growth Index to Growing Degree Days
Accession number: 20201608416903
Title of translation:
Authors: Wang, Quanjiu (1, 2); Lin, Shudong (1); Su, Lijun (1)
Author affiliation: (1) State Key Laboratory of Eco-hydraulic in Northeast Arid Region, Xi’an University of Technology, Xi’an; 710048, China; (2) State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Ministry of Water Resources, Yangling; Shaanxi; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 306-316
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The growing degree days can reflect the comprehensive influence of climatic conditions on crop growth and analyze the thermal conditions of crops. It is used to determine the suitable sowing time, growth period and corresponding physiological growth characteristics of crops under a certain climatic conditions. Usually, growing degree days are defined as the sum of the growing degree days by a crop during its growth period. The growth characteristics of potatoes in different regions were systematically researched, and the universal growth models of the growth indexed with growing degree days as independent variable growing degree days were established, the leaf area index (LAI), dry matter accumulation of whole plant and dry matter accumulation of tuber were chosen as the main growth indexes. The results showed that the corresponding growth rate of the leaf area index, the dry matter’s accumulation capacity in the whole plant and the dry matter’s accumulation capacity in tubers were respectively increased to a maximum value when growing degree days reached 600 (tuber formation stage), 900 (early stage of tuber expansion) and 1 100 (late stage of tuber expansion). In addition, the growth rate of LAI in potato seedling stage and tuber formation stage (growing degree days was less than 900) was higher than that of tuber dry matter accumulation, while the growth rate of tuber dry matter accumulation in tuber expansion period (growing degree days was greater than or equal to 900) was higher than that of LAI. The growth process of LAI, dry matter accumulation of the whole plant and tuber dry matter accumulation all had “S-shaped” changing curve with “slower-faster-slower” characteristics, which meant that the index growth curve conformed to the Logistic growth model. The Logistic growth model was used to quantitatively analyze the process of potato LAI, dry matter accumulation of the whole plant and tuber dry matter accumulation, it indicated that the model can be used to describe the changing process of potato main growth indexes. The results can not only provide a scientific basis for the rational selection of suitable sowing dates and long-term management of potatoes, but also provide a reference for the effective utilization of local natural climate conditions to achieve high yield and efficiency. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 65
Main heading: Tubes (components)
Controlled terms: Crops? - ?Expansion? - ?Plant expansion? - ?Plants (botany)
Uncontrolled terms: Climatic conditions? - ?Dry matter accumulation? - ?Growing degree days? - ?Growth characteristic? - ?Independent variables? - ?Logistic growth model? - ?Long-term management? - ?Physiological growth
Classification code: 619.1 Pipe, Piping and Pipelines? - ?821.4 Agricultural Products? - ?951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2020.03.035
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
9. Self-calibrating Variable Structure Kalman Filter for Tractor Navigation during BDS Outages
Accession number: 20201608416945
Title of translation: KalmanBDS
Authors: Zhang, Wenyu (1); Wang, Jin (2); Zhang, Zhigang (1); He, Jie (1); Hu, Lian (1); Luo, Xiwen (1)
Author affiliation: (1) Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou; 510642, China; (2) LOVOL Heavy Industry Co., Ltd., Weifang; 261206, China
Corresponding author: Luo, Xiwen(xwluo@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: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 18-27
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: BDS outages and leads to steering failure is an acknowledged challenge when the agricultural machine is automatically navigating. Steering failure will lead to increased labor intensity and loss of agricultural materials. A kind of self-calibrating variable structure Kalman filter for tractor navigation during BDS outages was presented. A Kalman filter was designed to integrate BDS and INS information for improving positioning quality. The filter was real-time calibrated by a calibration method of initial heading based on auto regressive model and a calibration method of angular rate zero offset online, which could process BDS/INS information and combined navigation tracking control method, thus implementing the continuous navigation function. The method was tested for decimeter accuracy in both robotic vehicle navigation system and tractor in-field to follow paths with lines and rectangles during BDS outages. In the robotic vehicle test, the speed of vehicle was set 1.0 m/s, the performance was compared with that of the variable structure Kalman method without self-calibrating. The results showed that the self-calibrating variable structure Kalman method reduced the actual lateral deviation and BDS between INS positioning distance during BDS outages by 34% and 44%, respectively. The average driving distance was increased by 80% when the lateral deviation reached 20 cm, and then reduced. In the tractor in-field test, the speed of vehicle was set 1.0 m/s, the average driving distance reached 16.65 m when the lateral deviation reached 20 cm. This method had guiding value for the emergency endurance processing of BDS outages in the process of cotton planting automatic navigation. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Kalman filters
Controlled terms: Agricultural robots? - ?Agriculture? - ?Automobile steering equipment? - ?Automobile testing? - ?Calibration? - ?Inertial navigation systems? - ?Robotics? - ?Steering? - ?Tractors (agricultural)? - ?Tractors (truck)
Uncontrolled terms: Agricultural machine? - ?Auto regressive models? - ?Automatic navigation? - ?Calibration method? - ?Combined navigation? - ?Navigation functions? - ?Robotic vehicle navigation? - ?Variable structures
Classification code: 662 Automobiles and Smaller Vehicles? - ?662.4 Automobile and Smaller Vehicle Components? - ?663.1 Heavy Duty Motor Vehicles? - ?731.5 Robotics? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Numerical data indexing: Percentage 3.40e+01%, Percentage 4.40e+01%, Percentage 8.00e+01%, Size 1.66e+01m, Size 2.00e-01m, Velocity 1.00e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.03.002
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
10. Vibration Suppression of Telescopic Arm Based on Differential Flatness and Active Disturbance Rejection Control
Accession number: 20201608417022
Title of translation:
Authors: Jiang, Haiyong (1, 2); Xing, Yazhou (2); Li, Na (2); Jiang, Wenguang (1)
Author affiliation: (1) School of Mechanical Engineering, Yanshan University, Qinhuangdao; 066004, China; (2) College of Electrical and Mechanical, Hebei Agricultural University, Baoding; 071001, China
Corresponding author: Jiang, Wenguang(wgj@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: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 394-401
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The manned aerial vehicle with the telescopic arm is full of danger in the parameter tuning process. It is necessary to construct a vibration suppression controller which is effective and easy to tune. The telescopic arm was theoretically divided into two rigid bodies. The dynamics of the equivalent second-order underactuated system was established based on the Lagrange equation. The model adopted the combination of elevation increment of the first link and tip acceleration of the second link to flatten the system, and made it into a second-order single input single output model. The input gain and coefficient of zero-order term were automatically updated along with the elevation or length change of the arm and substituted them into the active disturbance rejection control (ADRC) system. Application of the proposed algorithm was shown on the simulation and experiment platform. The favorable results of arm stability was achieved under the controlling of flatness-ADRC in the case of changing in length and angle. Under the two working conditions of extension and shortening, the balance can all be restored within 2 s. It was an innovation to design differential flat system with two different physical quantities, in addition the clear physical meaning of parameters in tuning process was very important in this life-related system. Under the condition of simplified model, the parameters of the control system were adjusted according to the extension length and attitude, which ensured the system’s disturbance rejection ability to be continuous and effective. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Disturbance rejection
Controlled terms: Antennas? - ?Equations of motion? - ?Simulation platform
Uncontrolled terms: Active disturbance rejection controls? - ?Differential flatness? - ?Experiment platforms? - ?Physical meanings? - ?Physical quantities? - ?Single input single output? - ?Under-actuated systems? - ?Vibration suppression
Classification code: 731 Automatic Control Principles and Applications? - ?921.2 Calculus
Numerical data indexing: Time 2.00e+00s
DOI: 10.6041/j.issn.1000-1298.2020.03.046
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
11. Estimation of Spatial Distribution of Field-scale Evapotranspiration
Accession number: 20201608416956
Title of translation:
Authors: Su, Baofeng (1, 2); Wang, Cong (1, 2); Zhang, Rufei (1, 2); Chen, Shan (1, 2)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Key Laboratory of Agricultural Internet of Things, Ministry of Agriculture and Rural Affairs, Yangling; Shaanxi; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 156-163 and 190
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to address the lack of a high-resolution spatial modeling method for effectively quantifying evapotranspiration in farmland, a temperature-corrected drone estimation farmland ET method was proposed. In order to obtain temperature data and multispectral data, M100 drone was equipped with an FLIR VueProR infrared camera and a Micasense RedEdge multispectral camera. The remote sensing evapotranspiration model was studied, the mapping evapotranspiration at high resolution with internalized calibration (METRIC) model and the remote sensing energy balance (RSEB) model were compared. The soil heat flux calculation method for the RSEB model was not applicable to the farmland environment. The model was improved based on multi-spectral data to raise the applicability of the model. Because equipment and environmental factors can easily produce errors when measuring temperature in the RSEB model, the relationship between remote sensing temperature data and the actual temperature was applied as a method to correct thermal imaging. The data was substituted to obtain the flux value and the evapotranspiration, and the model calculation results were compared with the open path eddy covariance (OPEC) measurement results. The results showed that the RSEB model combined with multi-spectral data can obtain accurate flux data after temperature correction. The root mean square error of the sensible heat flux was 20.013 W/m2, and the mean absolute error was 15.835 W/m2, the root mean square error of the latent flux was 42.202 W/m2, and the mean absolute error was 26.017 W/m2. The spatial distribution map of farmland evapotranspiration with resolution decimeter level was obtained. The method can effectively obtain the high-efficiency spatial pattern of field evapotranspiration and provide support for farmland irrigation. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Farms
Controlled terms: Cameras? - ?Drones? - ?Errors? - ?Evapotranspiration? - ?Heat flux? - ?Infrared imaging? - ?Mean square error? - ?Remote sensing? - ?Spatial distribution
Uncontrolled terms: Environmental factors? - ?Evapotranspiration modeling? - ?Field evapotranspiration? - ?Measuring temperature? - ?Multi-spectral cameras? - ?Root mean square errors? - ?Spatial distribution map? - ?Temperature correction
Classification code: 641.2 Heat Transfer? - ?742.2 Photographic Equipment? - ?746 Imaging Techniques? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?921 Mathematics? - ?922.2 Mathematical Statistics
Numerical data indexing: Surface_Power_Density 1.58e+01W/m2, Surface_Power_Density 2.00e+01W/m2, Surface_Power_Density 2.60e+01W/m2, Surface_Power_Density 4.22e+01W/m2
DOI: 10.6041/j.issn.1000-1298.2020.03.018
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
12. Estimation of Ear Development Dynamics of Maize Based on Normalized Canopy Cover
Accession number: 20201608417010
Title of translation:
Authors: Jia, Biao (1); He, Zheng (1); Wang, Rui (1); Sun, Quan (1); Wang, Zhangjun (1); Liu, Genhong (1)
Author affiliation: (1) School of Agriculture, Ningxia University, Yinchuan; 750021, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 138-145
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The main objective was to analyze the relationship between canopy image parameters and ear morphology parameters of drip irrigated maize in Ningxia. A mathematical method for fitting the growth characteristics of corn ear with crop canopy image parameters was proposed. The dynamic estimation model of ear development during corn filling stage was established to realize the non-destructive monitoring of corn ear morphology based on crop canopy digital image processing technology. The mobile phone camera technology was used to obtain the canopy image of the drip irrigated maize under different nitrogen treatments, and the canopy image parameters of maize filling stage were extracted to determine the morphological parameters such as ear length, ear diameter and ear volume. Correlation analysis was carried out by using R language to find out the normalized canopy cover factor (Cc) as the image feature parameter with high correlation between maize and ear morphological parameters. The Origin software was used to establish an estimation model between Cc and ear morphological parameters, and the accuracy of the model was estimated by R2, RMSE and nRMSE. The results showed that the morphological parameters of Cc and ear length, ear diameter and ear volume of maize satisfied the exponential function, and the prediction accuracy of Cc and ear length was the highest, the coefficient of determination R2 was 0.714, and the prediction accuracy of ear diameter was the second with R2 of 0.601 and R2 of ear volume was 0.575. From the model test and evaluation results, it can be seen that the accuracy of Cc and maize ear morphology parameters was higher, and the R2 was no less than 0.523, the ear volume RMSE value did not exceed 68.986 cm3, and nRMSE was no more than 33.621%. Therefore, the estimation results of maize ear growth and development based on canopy image normalized coverage coefficient Cc had certain practicality, which can provide reference for estimation of ear shape parameters and non-destructive monitoring of large area maize. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Parameter estimation
Controlled terms: Crops? - ?Exponential functions? - ?Image analysis? - ?Morphology
Uncontrolled terms: Coefficient of determination? - ?Correlation analysis? - ?Development dynamics? - ?Digital image processing technologies? - ?Growth characteristic? - ?Morphological parameters? - ?Morphology parameters? - ?Non-destructive monitoring
Classification code: 821.4 Agricultural Products? - ?921 Mathematics? - ?951 Materials Science
Numerical data indexing: Percentage 3.36e+01%, Volume 6.90e-05m3
DOI: 10.6041/j.issn.1000-1298.2020.03.016
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
13. Design of Freeze-thaw Detection Sensor for Standing Forest Stock Based on Latent Heat
Accession number: 20201608416875
Title of translation:
Authors: Tian, Hao (1); Gao, Chao (2); Zhao, Yue (1, 3); Zheng, Yan (1, 4); Zhao, Yandong (1, 4)
Author affiliation: (1) School of Technology, Beijing Forestry University, Beijing; 100083, China; (2) School of Computer and Information Engineering, Beijing Technology and Business University, Beijing; 100048, China; (3) Beijing Laboratory of Urban and Rural Ecological Environment, Beijing; 100083, China; (4) State Forestry Administration Key Laboratory of Forestry Equipment and Automation, Beijing; 100083, China
Corresponding author: Zhao, Yandong(yandongzh@bjfu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 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: Aiming to solve the problem that plant water physiological information (plant water and ice content) during freeze-thaw process is difficult to be monitored on-line and continuously in real time and judged accurately by freeze-thaw process. A monitoring sensor for freeze-thaw of living standing trees was designed based on latent heat effect, which detected the temperature caused by latent heat release during plant freeze-thaw process. Based on the accurate detection of freeze-thaw point, the ice content and radial freeze-thaw depth of stem volume during freeze-thaw process were calculated according to the change of moisture content of stem volume. At the same time, a circular projectile probe was designed to eliminate the pressure of fixed probe on stem to form a groove. Calibration results showed that the determination coefficient of fitting between the measured results and the true values of the sensor was more than 0.99. Static and dynamic characteristics showed that the measurement range of moisture and temperature of the sensor was from 0 to 68.67% and -30 to 80, respectively, and the dynamic response time was less than 2 s. The results of indoor freeze-thaw simulation experiment and outdoor long-term freeze-thaw monitoring showed that the sensor can effectively detect the changes of water physiological information during plant freeze-thaw process. It provided a device with independent intellectual property rights, real-time continuous monitoring, low cost and easy installation for agricultural and forestry production and plant freeze-thaw assessment. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Freezing
Controlled terms: Agricultural robots? - ?Forestry? - ?Intellectual property? - ?Latent heat? - ?Laws and legislation? - ?Moisture? - ?Physiological models? - ?Physiology? - ?Probes? - ?Thawing
Uncontrolled terms: Continuous monitoring? - ?Determination coefficients? - ?Forestry production? - ?Freeze-thaw process? - ?Intellectual property rights? - ?Latent heat release? - ?Physiological informations? - ?Static and dynamic characteristics
Classification code: 461.9 Biology? - ?641.1 Thermodynamics? - ?902.3 Legal Aspects? - ?971 Social Sciences
Numerical data indexing: Percentage 0.00e+00% to 6.87e+01%, Time 2.00e+00s
DOI: 10.6041/j.issn.1000-1298.2020.03.026
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
14. Design and Experiment of Self-propelled TMR Preparation Mixer for Silage Straw Feed
Accession number: 20201608416886
Title of translation:
Authors: Tian, Fuyang (1, 2); Chen, Yuhua (1, 3); Song, Zhanhua (1, 2); Yan, Yinfa (1, 2); Li, Fade (1, 2); Wang, Zhonghua (4)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Key Laboratory of Horticultural Machineries and Equipment, Shandong Agricultural University, Tai’an; 271018, China; (3) Shandong Provincial Engineering Laboratory of Agricultural Equipment Intelligence, Shandong Agricultural University, Tai’an; 271018, China; (4) College of Animal Science and Technology, Shandong Agricultural University, Tai’an; 271018, 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: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 106-114
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The formula for a total mixed rations (TMR) was designed by animal nutrition experts and included roughage chopped to an appropriate length, concentrates, and various additives that were fully mixed in certain proportions. There were two main methods currently utilized for silage storage: in a silage pit and in silage bales. On the basis of the existing vertical feed mixer, the self-propelled TMR mixer with the loader and conveyor was developed, the scheme of this designed self-propelled TMR mixer was put forward, and the practicability of the prototype was verified. Silage bales wrapped with a stretchable film was widely used in the animal husbandry industry to remove the bottleneck when preparing silage straw feed. The current methods to manually remove the stretchable films or the use of machines with a plurality of single functions were time-consuming. Therefore, a bale splitter matched with a self-propelled TMR mixer that provided the functions of bale gripping and cutting, material loading, and film removal was designed to realize integrated feeding in the pasture with high efficiency. The self-propelled hydrostatic driving system was adopted, and the self-propelled TMR mixer realized the combined functions of reclaiming and conveying of material in the silage pit, mixing of roughage and concentrate, transporting and discharging of rations, self-propelled TMR mixers like that considered here played an important role in speeding up the utilization of crop straw as feed. This constituted one component of the implementation of a policy of ‘grain to feed’ with the aim of alleviating the problems arising when people and livestock compete for grain. The test results showed that the maximum height and width of reclaiming reached 5 000 mm and 2 000 mm, respectively, the average preparation time was 23.7 min. The mixing uniformity was 91.1%, the production efficiency of TMR was 29.6 m3/h, the residual rate of unloading was 0.7%, and the removal rate of the waste film was 98.4%, which met the stipulated requirements and provided a reference for further design of the equipment. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Mixers (machinery)
Controlled terms: Additives? - ?Agriculture? - ?Animals? - ?Efficiency? - ?Film preparation? - ?Mixing? - ?Unloading
Uncontrolled terms: Animal husbandry? - ?Animal nutritions? - ?Combined functions? - ?Driving systems? - ?High-efficiency? - ?Material loading? - ?Mixing uniformities? - ?Production efficiency
Classification code: 691.2 Materials Handling Methods? - ?802.3 Chemical Operations? - ?803 Chemical Agents and Basic Industrial Chemicals? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?913.1 Production Engineering
Numerical data indexing: Percentage 7.00e-01%, Percentage 9.11e+01%, Percentage 9.84e+01%, Size 2.00e+00m, Size 5.00e+00m, Time 1.42e+03s
DOI: 10.6041/j.issn.1000-1298.2020.03.012
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
15. Test of Suspension Velocity of Granular Fertilizer Based on EDEM-Fluent Coupling
Accession number: 20201608416887
Title of translation: EDEM-Fluent
Authors: Wen, Xiangyu (1, 2); Jia, Honglei (1, 2); Zhang, Shengwei (1, 2); Yuan, Hongfang (1, 2); Wang, Gang (1, 2); Chen, Tianyou (1, 2)
Author affiliation: (1) College of Biological and Agricultural Engineering, Jilin University, Changchun; 130025, China; (2) Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun; 130025, China
Corresponding author: Yuan, Hongfang(yhf1984828@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 69-77
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Suspension velocity is one of the main aerodynamic characteristics of materials, and it is an important basic data for the design of pneumatic conveying system. A reference for the design of pneumatic fertilization device was provided, and three kinds of granular fertilizers of large granular urea, diammonium phosphate and potassium sulfate were taken as test objects. The suspension velocity of materials was simulated by the coupling method of computational fluid dynamics and discrete element method. The Lagrangian model was used to simulate the gas-solid two-phase flow. The experimental results showed that the suspension velocity of large granular urea was 7.21~12.97 m/s, the suspension velocity of diammonium phosphate was 7.68~12.48 m/s, and the suspension velocity of potassium sulfate was 11.09~18.15 m/s. Through the bench test, the suspension velocity of large granular urea was 6.68~12.48 m/s, diammonium phosphate was 7.22~11.96 m/s, potassium sulfate was 9.46~17.81 m/s, the relative errors were 5.3%, 5.1% and 7.2%, respectively. When the volume fraction of granular fertilizer was 1.0%, 3.5%, 6.0% and 8.5%, the suspension speed of granular fertilizer group was measured. The suspension speed of granular fertilizer group was decreased with the increase of volume fraction. Under different volume fractions of granular fertilizer, the ratio of simulation test results to real test results was approximately constant, which was supposed to be due to the influence of particle sphericity on suspension speed. The results showed that the correction coefficient of the suspension velocity of large granular urea was 0.90, that of diammonium phosphate was 0.96, and that of potassium sulfate was 0.84. Therefore, the simulation test of particle suspension velocity through fluid solid coupling simulation had a high accuracy, which verified the feasibility of the method of measuring the suspension velocity of materials based on EDEM-Fluent gas-solid two-phase flow coupling simulation, and provided a new method for measuring the suspension velocity of agricultural materials. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 33
Main heading: Suspensions (fluids)
Controlled terms: Agricultural robots? - ?Computational fluid dynamics? - ?Lagrange multipliers? - ?Metabolism? - ?Phosphate fertilizers? - ?Pneumatic conveyors? - ?Pneumatics? - ?Potash? - ?Sulfur compounds? - ?Testing ? - ?Two phase flow? - ?Urea? - ?Urea fertilizers? - ?Velocity? - ?Volume fraction
Uncontrolled terms: Aerodynamic characteristics? - ?Correction coefficients? - ?Diammonium phosphates? - ?Fluid-solid coupling? - ?Gas solid two phase flow? - ?Granular fertilizers? - ?Particle suspensions? - ?Pneumatic conveying system
Classification code: 631.1 Fluid Flow, General? - ?632.3 Pneumatics? - ?632.4 Pneumatic Equipment and Machinery? - ?641.1 Thermodynamics? - ?723.5 Computer Applications? - ?804 Chemical Products Generally
Numerical data indexing: Percentage 1.00e+00%, Percentage 3.50e+00%, Percentage 5.10e+00%, Percentage 5.30e+00%, Percentage 6.00e+00%, Percentage 7.20e+00%, Percentage 8.50e+00%, Velocity 1.11e+01m/s to 1.81e+01m/s, Velocity 6.68e+00m/s to 1.25e+01m/s, Velocity 7.21e+00m/s to 1.30e+01m/s, Velocity 7.22e+00m/s to 1.20e+01m/s, Velocity 7.68e+00m/s to 1.25e+01m/s, Velocity 9.46e+00m/s to 1.78e+01m/s
DOI: 10.6041/j.issn.1000-1298.2020.03.008
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
16. Kinematic Analysis of Novel 6-DOF Delta Robot
Accession number: 20201608416959
Title of translation: 6Delta
Authors: Zhang, Jun (1); Xu, Tao (1); Fang, Hanliang (1); Zhang, Liang’an (2)
Author affiliation: (1) School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou; 350116, China; (2) School of Mechanical Engineering, Anhui University of Technology, Maanshan; 243032, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 419-426
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to meet the requirement of multi-angle operation in industrial pick-and-place applications, a novel six degree-of-freedom (DOF) Delta robot with three sets of symmetrically distributed coupled branches was proposed. Firstly, the 6-DOF Delta robot was decomposed into three sets of coupled branches, which can be regarded as independent motion units and can be further treated as equivalent serial chains. The mobility of the overall parallel mechanism was analyzed based on the screw theory to demonstrate that it had three rotational and three translational motion capabilities. Secondly, since each set of coupled branches contained two kinematic chain, the closed-loop vector method was used to calculate the inverse position solution of two chain in the coupled branch, based on which an inverse kinematic model of the proposed robot was established. Furthermore, a search algorithm was proposed to describe the robot’s workspace under the boundary condition which was compared with that of a traditional 3-DOF Delta robot at the same parameter level. Simulation results showed that the workspace of a traditional 3-DOF Delta robot was a subset of that of the proposed 6-DOF Delta robot. Finally, the kinematic experiments were carried out on the engineering prototype, the results showed that the proposed robot had three degree-of-freedom of rotation and three degree-of-freedom translational motion, and can achieve multi-angle grabbing operation. In the robot workspace, the limit position of the typical motion plane was consistent with the simulation analysis results. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Robot programming
Controlled terms: Degrees of freedom (mechanics)? - ?Inverse kinematics? - ?Mechanisms? - ?Robots
Uncontrolled terms: Independent motions? - ?Inverse kinematic models? - ?Kinematic Analysis? - ?Parallel mechanisms? - ?Simulation analysis? - ?Six degree-of-freedom? - ?Three degree of freedoms? - ?Translational motions
Classification code: 601.3 Mechanisms? - ?731.5 Robotics? - ?931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2020.03.049
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
17. Robotic Compliant Control Based on Force Sensor Gravity Compensation
Accession number: 20201608416908
Title of translation:
Authors: Huang, Lingtao (1); Wang, Bin (1); Ni, Shui (2); Yang, Jinsong (1); Ni, Tao (1)
Author affiliation: (1) School of Mechanical and Aerospace Engineering, Jilin University, Changchun; 130022, China; (2) Management Committee of National Science Park, China University of Petroleum, Dongying; 257091, China
Corresponding author: Ni, Tao(nitao@jlu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 386-393
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to meet the sensing demand of the contact force between the end load of industrial robot and external environment, a force sensor was installed between the end of robot and load. Force sensor can provide force sensing function in the process of industrial robot operation, which was the basis of robot compliance control. The robot motion system based on force perception control can realize dual control of force and position in the process of robot operation by perceiving the contact force of external environment. In order to improve the robot’s perception accuracy of contact force and achieve accurate compliance control, a robotic compliance control method was proposed based on force sensor gravity compensation. The force sensor data of the robot in different postures was firstly collected by adjusting the posture of the robot end, and the installation tilt angle of the robot base, the bias of sensor and the center of gravity coordinates of the end tool were calculated. Then, the robot attitude transformation matrix was used to realize the gravity compensation of the sensor and provide accurate force perception for robot compliance control. Finally, the admittance control method was adopted to realize the robot’s grasping and handling of objects. The force sensor gravity compensation experiment and the robot flexible placement experiment were carried out. The experimental data analysis and experimental results showed that the proposed method can improve the accuracy of robot’s perception of the external environment and achieve accurate robot flexible control. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Compliance control
Controlled terms: Industrial robots? - ?Linear transformations? - ?Robotics
Uncontrolled terms: Admittance control? - ?Center of gravity? - ?Experimental data analysis? - ?External environments? - ?Flexible control? - ?Gravity compensation? - ?Robot compliance control? - ?Transformation matrices
Classification code: 731 Automatic Control Principles and Applications? - ?921.3 Mathematical Transformations
DOI: 10.6041/j.issn.1000-1298.2020.03.045
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
18. Land Cover Classification in Mountainous Area Based on Airborne CCD Image with LiDAR
Accession number: 20201608417033
Title of translation: CCDALS
Authors: Huang, Kan (1); Yu, Qiang (1); Huang, Huaguo (1)
Author affiliation: (1) The Key Laboratory for Silviculture and Conservation, Ministry of Education, Beijing Forestry University, Beijing; 100083, China
Corresponding author: Huang, Huaguo(huaguo_huang@bjfu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 201-208
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to fuse airborne LiDAR scanning (ALS) and high resolution image for land cover classification, modeled LiDAR waveform that based on elevation information was integrated with CCD image three band (RGB) data in complex mountainous area. Verification experiment results showed that high accuracy for several typical land cover types classification in complex mountainous area could be acquired by the method. Moreover, the classification result of study area which located in Huangshan, Anhui Province was used to compare with the GlobeLand30 classification result to verify the method. The entire coverage of study area were classified into four land-cover types (farmland, forest, water and village) by characteristic curves that combined modeled waveform with intensity and RGB information through artificial neural network (ANN). The result showed that the overall accuracy of study area classification was 95.22%, and Kappa coefficient was 0.919 2. Compared with GlobeLand30 classification result accuracy (overall accuracy was 79.56% with Kappa coefficient of 0.661 8) in this area, the research results was improved significantly. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 33
Main heading: Classification (of information)
Controlled terms: Complex networks? - ?Image classification? - ?Neural networks? - ?Optical radar
Uncontrolled terms: Characteristic curve? - ?Classification results? - ?Complex mountainous areas? - ?High resolution image? - ?Kappa coefficient? - ?Land cover classification? - ?Overall accuracies? - ?Research results
Classification code: 716.1 Information Theory and Signal Processing? - ?716.2 Radar Systems and Equipment? - ?722 Computer Systems and Equipment
Numerical data indexing: Percentage 7.96e+01%, Percentage 9.52e+01%
DOI: 10.6041/j.issn.1000-1298.2020.03.023
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
19. Diagnosing Method of Soil Moisture Content in Corn Field Based on Thermal Infrared Remote Sensing of UAV
Accession number: 20201608417830
Title of translation:
Authors: Zhang, Zhitao (1, 2); Xu, Chonghao (1, 2); Tan, Chengxuan (1, 2); Li, Yu (2); Ning, Jifeng (3)
Author affiliation: (1) The Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) College of Information Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 180-190
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to make the thermal infrared remote sensing diagnosis of soil moisture content more accurate and efficient, different water treatments of field corn were taken as the research object, the plant and soil separation of thermal infrared image was realized by the visible light image of UAV and corn canopy temperature and surface soil temperature were extracted. Optimization of temperature information by eliminating 1% of temperature pixels at both ends of the temperature histogram was made to calculate crop water stress index (CWSI), canopy relative temperature difference (CRTD) and surface relative temperature difference (SRTD). The sum of the above three indices led to a new indicator which can diagnose soil moisture content at different depths. The results showed that there were higher correlation between the corn canopy temperature which eliminated 1% of temperature pixels at both ends of the temperature histogram and the measured canopy temperature (R2 was increased from 0.823, 0.886, 0.899 and 0.876 to 0.906, 0.938, 0.944 and 0.922 of four tests), and there were also higher correlation between the soil temperature which eliminated the 1% temperature pixel at the front of the temperature histogram and the measured soil temperature (R2 was increased from 0.841 and 0.875 to 0.908 and 0.925 of two tests), which indicated that the temperature optimized by the histogram method was closer to the measured temperature. In the early stage of jointing, CWSI and WTCI had better soil moisture content in the diagnosis of 0~20 cm, while the soil moisture content in the late stage of jointing, tasseling-silking and maturity was better than that of 0~40 cm. Under half coverage, WTCI1 with canopy temperature information (CWSI, CRTD) and soil temperature information (SRTD) was more correlated with soil moisture (0~40 cm: R2 was 0.500 and 0.821, which was higher than 0.463 and 0.748)). Under full coverage, WTCI2 with canopy relative temperature difference (CRTD) was more correlated with soil moisture (0~40 cm: R2 was 0.809 and 0.729, which was higher than 0.721 and 0.656), it indicated that WTCI was a new indicator for better diagnosis of soil moisture content. The research result provided new methods and new ideas for accurate acquisition of crop canopy temperature and accurate diagnosis of soil moisture content. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Soil moisture
Controlled terms: Crops? - ?Graphic methods? - ?Infrared imaging? - ?Infrared radiation? - ?Moisture determination? - ?Pixels? - ?Remote sensing? - ?Temperature? - ?Unmanned aerial vehicles (UAV)
Uncontrolled terms: Crop water stress indices? - ?Measured temperatures? - ?Relative temperatures? - ?Surface soil temperatures? - ?Temperature information? - ?Thermal infrared images? - ?Thermal infrared remote sensing? - ?Visible light images
Classification code: 483.1 Soils and Soil Mechanics? - ?641.1 Thermodynamics? - ?652.1 Aircraft, General? - ?741.1 Light/Optics? - ?746 Imaging Techniques? - ?821.4 Agricultural Products? - ?944.2 Moisture Measurements
Numerical data indexing: Percentage 1.00e+00%, Size 0.00e+00m to 2.00e-01m, Size 0.00e+00m to 4.00e-01m
DOI: 10.6041/j.issn.1000-1298.2020.03.021
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
20. Design and Experiment of Wheel-spoon Type Garlic Precision Seed-picking Device
Accession number: 20201608417080
Title of translation:
Authors: Li, Yuhua (1, 2); Zhang, Zhilong (1, 2); Li, Tianhua (1, 2); Wu, Yanqiang (1, 2); Niu, Ziru (1, 2); Hou, Jialin (1, 2)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Engineering Laboratory of Agricultural Equipment Intelligence, Tai’an; 271018, China
Corresponding author: Hou, Jialin(jlhou@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: 3
Issue date: March 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: Due to large grain size, irregular shape and rough surface of garlic seeds, the missed sowing rate and reseeding rate are high. Aiming to mitigate these problems, a wheel-spoon type garlic seed metering device was designed, which was mainly composed of seed scoop, seed taking wheel, driving motor, bracket and seed box. The stress analyses of garlic seeds in seed taking zone, transferring zone and discharging zone of the device were carried out. The optimal structures of spoons and wheels after comparing the structural shapes of different types of spoons and wheels via discrete element simulation analyses were determined. The size of seed scoop was statistically determined. The orthogonal regression test was performed, treating the radius of seed scoop, the length of seed scoop and the rotation speed of seed wheel as test factors, and the rate of missed sowing and the qualified rate as response indexes. The regression models of missed sowing rate and qualified rate were established through analysis of the test data and then the parameters of garlic seed metering device were optimized based on the regression model. The platform test was carried out on the garlic seed metering device with radius, length and rotation speed of seed scoop as 16.30 mm, 38.50 mm and 10.0 r/min, respectively. The results showed that the missed seeding rate was 5.50% and the qualified rate was 91.10%, which were consistent with the results predicted by the regression model. The research can provide a solid basis for precision sowing technology in garlic. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Regression analysis
Controlled terms: Pneumatic materials handling equipment? - ?Structural optimization? - ?Wheels
Uncontrolled terms: Discrete element simulation? - ?Large grain sizes? - ?Optimal structures? - ?Orthogonal regression? - ?Precision sowing? - ?Regression model? - ?Seed metering devices? - ?Structural shape
Classification code: 601.2 Machine Components? - ?632.4 Pneumatic Equipment and Machinery? - ?921.5 Optimization Techniques? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 5.50e+00%, Percentage 9.11e+01%, Rotational_Speed 1.00e+01RPM, Size 1.63e-02m, Size 3.85e-02m
DOI: 10.6041/j.issn.1000-1298.2020.03.007
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
21. Detection Method of Mitigating Fault of Combined Navigation System Based on Improvement of New Interest Sequence
Accession number: 20201608416912
Title of translation:
Authors: Fu, Jun (1); Han, Hongxiang (1); Dai, Haifa (1)
Author affiliation: (1) Department of Navigation, Naval University of Engineering, Wuhan; 430033, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 28-33 and 50
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With the development of agricultural machinery automatic navigation technology, the precision and stability of agricultural machinery positioning are becoming more and more demanding, MIMU has a broad application prospect in the fields of intelligent agricultural equipment because of its small size, low cost and high reliability. However, due to its own working principle, structure, manufacturing level and error in the installation of the device, MIMU signal output accuracy is poor, resulting in fast dispersion of navigation information over time. It has become an important way to improve the overall performance and accuracy of MIMU-based agricultural mechanical navigation system by using combined navigation technology. However, the increase in system sensors means that the complexity and failure rate of the entire combined navigation system are also increasing. Since the traditional residual χ2 test method hasn’t fully considered the characteristic of the progressive change of the soft fault, which may cause the failure detection of the soft fault, an improved fault detection method of interest sequence was created. Based on the traditional innovation sequence fault detection method, the statistical magnitude with the fuzzy membership function was detected. By using the weighted average algorithm, it can take the detection statistics sitting in the overlapping area of the fault probability density curve and the fault-free probability density curve into the fault detection and increase information for soft fault estimation, so the soft fault could be detected early without increasing the false alarm. The simulation test result showed that the application of this method in the federated filter integrated navigation system could effectively increase the fault-tolerant ability of the integrated navigation system to soft fault. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Fault detection
Controlled terms: Agricultural machinery? - ?Agricultural robots? - ?Agriculture? - ?Air navigation? - ?Failure analysis? - ?Membership functions? - ?Navigation systems
Uncontrolled terms: Agricultural equipment? - ?Automatic navigation? - ?Fault tolerant ability? - ?Fuzzy membership function? - ?Innovation sequence? - ?Integrated navigation systems? - ?Mechanical navigation systems? - ?Navigation in formation
Classification code: 431.5 Air Navigation and Traffic Control? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?821.1 Agricultural Machinery and Equipment? - ?921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2020.03.003
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
22. Investigation and Experiment on Autonomous Landing Algorithm of Agricultural Unmanned Aerial Vehicle Movable Supply Platform
Accession number: 20201608417002
Title of translation:
Authors: Zu, Linlu (1, 2); Hou, Jialin (1, 3); Chen, Min (1); Wang, Hong (1); Su, Fei (1, 3)
Author affiliation: (1) School of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment, Shandong Agricultural University, Tai’an; 271018, China; (3) Shandong Provincial Engineering Laboratory of Intelligent Agricultural Equipment, Shandong Agricultural University, Tai’an; 271018, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 43-50
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The movable supply platform of agricultural unmanned aerial vehicles (UAVs) can change the landing site of midway supplying according to the variation of the UAVs location. It was mainly focused on the autonomous landing of agricultural UAVs on movable supply platform. The main novelty was that a piecewise control algorithm which combined the fuzzy logic control and PID control was proposed to control the landing process. When the distance error between the agricultural UAV and the movable supply platform was larger than the preset threshold, the fuzzy logic control was used to control the landing process due to its quick response character. When the distance error was smaller than the preset threshold, the PID control was used due to its high precision character. The detailed control process was as follows, firstly, in order to increase the recognition accuracy of UAV on movable platform, the upper part of the movable platform was designed to be a structure symmetry “H” pattern and the lower part was designed to be a contrasting QR code pattern. The UAV could use the optical flow algorithm to detect the black and white points, such that the relative speed between UAV and the platform could be calculated. Secondly, the dynamic model of UAV was constructed and then transformed its coordinates to the global coordinates to calculate the position error between agricultural UAV and the platform. Thirdly, the particle filter tracking algorithm and fitting function was used to fit the movement path of the UAV. At last, the proposed control method was used to control the UAV move along the fitted path. Using correlation coefficient index the Matlab simulation results proved the superiority of the proposed control method in tracking step signal and sinusoidal signal compared with individual fuzzy control method and PID control method. Furthermore, field test proved the control method could reduce the tracking error between UAV and movable supply platform to no more than 6.7 cm and the landing accuracy on movable supply to no more than 7.2 cm. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Process control
Controlled terms: Agricultural robots? - ?Agriculture? - ?Aircraft control? - ?Aircraft detection? - ?Antennas? - ?Computer circuits? - ?Errors? - ?Fuzzy control? - ?Fuzzy logic? - ?Landing ? - ?MATLAB? - ?Three term control systems? - ?Unmanned aerial vehicles (UAV)
Uncontrolled terms: Autonomous landing? - ?Correlation coefficient? - ?Fuzzy control methods? - ?Fuzzy logic control? - ?Matlab simulations? - ?Optical flow algorithm? - ?Recognition accuracy? - ?Structure symmetry
Classification code: 652 Aircraft and Avionics? - ?652.1 Aircraft, General? - ?716.2 Radar Systems and Equipment? - ?721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory? - ?721.3 Computer Circuits? - ?731 Automatic Control Principles and Applications? - ?731.1 Control Systems? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?921 Mathematics
Numerical data indexing: Size 6.70e-02m, Size 7.20e-02m
DOI: 10.6041/j.issn.1000-1298.2020.03.005
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
23. Annual-ring Measurement Method Based on Adaptive Filtering Algorithm
Accession number: 20201608416923
Title of translation:
Authors: Yao, Jianfeng (1, 2); Zhao, Yandong (3); Lu, Jun (1); Zheng, Yili (3); Gao, Ruidong (4); Tang, Shouzheng (1)
Author affiliation: (1) Research Institute of Forest Resources Information Techniques, Chinese Academy of Forestry, Beijing; 100091, China; (2) College of Computer and Information Technology, Xinyang Normal University, Xinyang; 464000, China; (3) School of Technology, Beijing Forestry University, Beijing; 100083, China; (4) Guancenshan State-owned Forest Administration of Shanxi Province, Xinzhou; 034000, China
Corresponding author: Tang, Shouzheng(stang@caf.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 216-222
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the accuracy of annual-ring measuring instrument, a new adaptive low-pass filtering algorithm was proposed to filter the direct current (DC) motor current signal of annual-ring measuring instrument. The filter coefficients of ordinary low-pass filtering algorithm were fixed. When the annual-ring width was changed, the current fileted by ordinary low-pass filter may not only retain part of the noise signal, but also filter part of the effective annual-ring signal, which reduced the accuracy of the annual-ring measuring instrument. The filter coefficients of the adaptive low-pass filter algorithm can be adjusted automatically with the changes of the input and output values of the filter, which can improve the effect of noise filtering and reduce the loss of effective signals. Totally 60 larch discs, including large, medium and small diameter orders were measured by self-manufactured annual-ring measuring instrument. The original current signals of DC motor were recorded. The adaptive low-pass filtering algorithm and the ordinary low-pass filtering algorithm were used to filter the original current signals of DC motor respectively. According to the filtered current waveform, the disc age was estimated, and the annual-ring recognition accuracy of the two filtering algorithms was calculated. The average annual-ring recognition accuracy of adaptive low-pass filter was 89.66%, and that of ordinary low-pass filter was 75.84%. The average annual-ring recognition accuracy of adaptive low-pass filter was 13.82 percentage points higher than that of ordinary low-pass filter. When the average ring width became more narrow, the annual-ring recognition accuracy of the adaptive low-pass filter was decreased by 13.59 percentage points from 95.61% to 82.02%, while that of the ordinary low-pass filter was decreased by 24.07 percentage points from 86.37% to 62.30%. The experiment results showed that the adaptive low-pass filter had high annual-ring recognition accuracy, strong self-adaptive ability and stable annual-ring recognition accuracy. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Low pass filters
Controlled terms: Adaptive filtering? - ?Adaptive filters? - ?DC motors? - ?Rings (components)
Uncontrolled terms: Adaptive filtering algorithms? - ?Filter coefficients? - ?Filtering algorithm? - ?Measurement methods? - ?Measuring instruments? - ?Motor current signals? - ?Recognition accuracy? - ?Self adaptive ability
Classification code: 601.2 Machine Components? - ?703.2 Electric Filters? - ?705.3.2 DC Motors
Numerical data indexing: Percentage 7.58e+01%, Percentage 8.64e+01% to 6.23e+01%, Percentage 8.97e+01%, Percentage 9.56e+01% to 8.20e+01%
DOI: 10.6041/j.issn.1000-1298.2020.03.025
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
24. Soil Organic Matter Detection Method Based on Artificial Olfactory System
Accession number: 20201608416921
Title of translation:
Authors: Zhu, Longtu (1, 2); Li, Mingwei (1, 2); Xia, Xiaomeng (1, 2); Huang, Dongyan (1, 2); Jia, Honglei (1, 2)
Author affiliation: (1) College of Biological and Agricultural Engineering, Jilin University, Changchun; 130022, China; (2) Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun; 130022, China
Corresponding author: Huang, Dongyan(cchdy760829@sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 171-179
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to measure soil organic matter content quickly and accurately, a method based on artificial olfactory was proposed. Firstly, the response curves of soil gas were collected by an array composed of 10 gas sensors controlled at different temperatures. And then seven features, including the maximum value, minimum value, mean value, mean differential coefficient value, response area value, transient value at the 30th second and transient value at the 60th second were extracted from each sensor response curves to build an olfactory feature space. Finally, the prediction model was established by using the regression algorithm. To reduce the influence of different regression algorithms, abnormal samples and redundancy characteristics on the prediction performance of the model, the Monte Carlo sampling (MCS) method was used to eliminate abnormal samples, and the principal component analysis (PCA) method was used to reduce the dimension of olfactory feature space. Moreover, three modeling methods, including partial least square regression (PLSR), support vector machine regression (SVR) and back propagation neural network (BPNN), were used to predict soil organic matter content. And the predictive performance of each model were evaluated by coefficient of determination (R2), root mean square error (RMSE) and ratio of prediction derivation (RPD). The results showed that the R2 values of PLSR, SVR and BPNN were 0.86, 0.91 and 0.85, respectively; the RMSE values were 2.49 g/kg, 2.05 g/kg and 2.68 g/kg, respectively; and the RPD values were 2.49, 3.02 and 2.32, respectively. The prediction performance of SVR model was higher than that of PLSR model and BPNN model, which can accurately predict the organic matter content. The results can provide a reference method for the prediction of soil organic matter. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 37
Main heading: Support vector regression
Controlled terms: Artificial organs? - ?Backpropagation? - ?Biogeochemistry? - ?Electronic nose? - ?Forecasting? - ?Least squares approximations? - ?Mean square error? - ?Monte Carlo methods? - ?Neural networks? - ?Organic compounds ? - ?Principal component analysis? - ?Soils? - ?Support vector machines
Uncontrolled terms: Artificial olfactory system? - ?Back-propagation neural networks? - ?Coefficient of determination? - ?Differential coefficient? - ?Partial least square regression? - ?Root mean square errors? - ?Soil organic matter contents? - ?Support vector machine regression (SVR)
Classification code: 462.4 Prosthetics? - ?483.1 Soils and Soil Mechanics? - ?723 Computer Software, Data Handling and Applications? - ?723.4 Artificial Intelligence? - ?801 Chemistry? - ?801.2 Biochemistry? - ?804.1 Organic Compounds? - ?921.6 Numerical Methods? - ?922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2020.03.020
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
25. Effects of Different Improvement Measures on Hydrothermal Carbon and Sunflower Yield in Salinized Soil
Accession number: 20201608417029
Title of translation:
Authors: Qu, Zhongyi (1); Hu, Min (1); Wang, Liping (1); Ding, Yanhong (2); Gao, Xiaoyu (1)
Author affiliation: (1) Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Huhhot; 010018, China; (2) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 268-275
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 improvement measures on hydrothermal carbon and sunflower yield in salinized soil, experiment was carried out by applying biochar (C, 22.5 t/hm2), desulfurization gypsum (S, 37.5 t/hm2), straw returning (J, 20.625 t/hm2) and control (CK) in field. The results showed that three improvement measures can improve the soil hydrothermal environment, of which biochar had advantages. The soil moisture content of the soil layers of 0~20 cm and 20~40 cm during the whole growth period was significantly higher than that of the control. In the vertical distribution, the improvement effect of water conservation and water storage of 0~40 cm soil layer was better than that of soil layer below 40 cm. The spatial distribution pattern of soil moisture in each treatment section showed the characteristics of wet and dry. Compared with CK, each improved treatment had good temperature increase and heat preservation effect, both of which had “warming effect” at low temperatures, and “cooling effect” at high temperatures, and the regulation of temperature was mainly concentrated at 5~25 cm soil layer, and weakened from 35 cm. The application of three improvement measures can increase the soil organic carbon content and organic carbon density, among which the biochar effect was the most significant, and the organic carbon content was increased by 17.46% compared with the control. Compared with the control, the yield of C treatment was the highest, reached 32.28%, and the yield of J and S treatment was increased by 21.94% and 30.68%, respectively. The difference between the three was not significant. According to comprehensive analysis, the application of biochar of 22.5 t/hm2 was more suitable for soil improvement in the process of planting sunflower in salinized farmland in Hetao Irrigation District. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Soil conservation
Controlled terms: Organic carbon? - ?Soil moisture? - ?Water conservation
Uncontrolled terms: Comprehensive analysis? - ?Desulfurization gypsums? - ?Hetao irrigation districts? - ?Hydrothermal environment? - ?Organic carbon contents? - ?Soil organic carbon content? - ?Spatial distribution patterns? - ?Vertical distributions
Classification code: 444 Water Resources? - ?483.1 Soils and Soil Mechanics? - ?804.1 Organic Compounds
Numerical data indexing: Percentage 1.75e+01%, Percentage 2.19e+01%, Percentage 3.07e+01%, Percentage 3.23e+01%, Size 0.00e+00m to 2.00e-01m, Size 0.00e+00m to 4.00e-01m, Size 2.00e-01m to 4.00e-01m, Size 3.50e-01m, Size 4.00e-01m, Size 5.00e-02m to 2.50e-01m
DOI: 10.6041/j.issn.1000-1298.2020.03.031
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
26. Effect of Horizontal Tillage Measures Regulatory on Soil Water and Salt Distribution under Mulched Drip Irrigation
Accession number: 20201608417001
Title of translation:
Authors: Chen, Wenjuan (1); Li, Mingsi (1); Qin, Wenbao (1); Xu, Ya’nan (1); Nie, Jinjie (1); Liang, Mengfan (1)
Author affiliation: (1) College of Water and Architectural Engineering, Shihezi University, Shihezi; 832003, China
Corresponding author: Li, Mingsi(leemince-709@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 276-286
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore the effect of horizontal tillage measures on the regulation of water and salt distribution in mulched drip irrigation, indoor soil trough tests and field trials were carried out in Shihezi and Korla of Xinjiang Uygur Autonomous Region, in 2016-2017 and 2019, respectively. The experiment designed horizontal tillage (T) and no-tillage (NT) treatment of soil by using mulched drip irrigation technology, indoor soil trough test was mainly used to research the regulation mechanism of soil water and salt distribution by tillage measures, and field test was mainly used for production. Verification was made to analyze the improvement effect of horizontal tillage measures on the soil salt outside the membrane. The result showed that compared with no-tillage treatment, horizontal tillage can increase the water storage capacity of soil beneath the film, reduce the soil horizontal infiltration capacity and vertical diffusion capacity, the average water content of inner-membrane plowing layer with tillage treatment was 3.66 percentage points higher than that of the no-tillage treatment,but the average water content of the soil below the plowing layer was 4.13 percentage points lower than that of the no-tillage treatment. The distribution of soil salinity beneath the membrane under horizontal tillage treatment was greatly affected by water leaching, while the soil salt distribution outside the membrane was mainly affected by tillage, and the total salt accumulation rate in the deep layer beneath the membrane was 1.23 times of that of no-tillage treatment, the range of tillage treatment soil desalting area outside the membrane was 25 cm deeper than that of no-tillage treatment; the first tillage had the most obvious desalination effect on the outside membrane soil, and the spring tillage can make the distribution of soil salinity beneath and outside the membrane more uniform, the cotton emergence ratio and effective plant ratio under tillage treatment were 23.62 and 25.19 percentage points higher than that of the no-tillage treatment. Under the condition of film drip irrigation, the combination of drip irrigation and horizontal mechanical tillage was equivalent to comprehensive utilization of water conservancy improvement and guest soil improvement to saving soil salinization, and finally the spatial distribution of salt produced by mulched drip irrigation technology was from the early stage of “exterior surface accumulation profiles” and gradually changed to the later of “interior bottom accumulation profiles”. The results can provide some ideas for solving the problem of soil salt surface accumulation under mulched drip irrigation, and can also provide a reference for the rational use of tillage measures under drip irrigation. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 35
Main heading: Soil surveys
Controlled terms: Desalination? - ?Irrigation? - ?Membranes? - ?Soil moisture? - ?Water management
Uncontrolled terms: Accumulation profiles? - ?Comprehensive utilizations? - ?Infiltration capacity? - ?Mulched drip irrigations? - ?Regulation mechanisms? - ?Surface accumulation? - ?Water storage capacity? - ?Xinjiang Uygur autonomous region
Classification code: 445.1 Water Treatment Techniques? - ?483.1 Soils and Soil Mechanics? - ?821.3 Agricultural Methods? - ?951 Materials Science
Numerical data indexing: Size 2.50e-01m
DOI: 10.6041/j.issn.1000-1298.2020.03.032
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
27. Internal Vortex Characteristics of Side Channel Pump with Convex Blade
Accession number: 20201608416885
Title of translation:
Authors: Zhang, Fan (1); Wei, Xueyuan (1); Chen, Ke (1); Yuan, Shouqi (1); Wang, Yefang (1); Chen, Hongjun (2)
Author affiliation: (1) National Research Center of Pumps, Jiangsu University, Zhenjiang; 212013, China; (2) Chongqing Pump Industry Co., Ltd., Chongqing; 400003, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 115-122
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Side channel pump is a kind of super-low specific speed radial vane pump which has small volume with low flow rate but high head. The fluid in the side channel pump travels in a spiral flow path and inherently leading to complex three-dimensional turbulent flows. These turbulent flows are accompanied with large numbers of axial and radial vortices during the operation of the pump. The vortices developed have direct influence of the performance, therefore it is very important to study and reveal the evolution of the vortices. In order to study the internal vortex characteristics of a side channel pump, unsteady numerical simulations were conducted on a traditional side channel pump impeller with convex blade through commercial software CFX 17.0. The accuracy and reliability of the numerical simulations were verified by experimental measurements. The Q-criterion method coupled with vorticity fluctuation was used to visualize and analyze the internal vortex structure. The results showed that the convex blade can increase the high efficient area of the side channel pump and broaden the application range of the side channel pump. However, compared with the general side channel pump, the head of the side channel pump with convex blade was slightly down. Compared with the inlet region and the side channel, the vortices developed within the pump with the convex blade mainly existed in the impeller passage. However, the vortices in the inner radius of impeller were greater than that of the outer radius, and the number of vortices near the inlet of the impeller was the largest and the most complicated. With the increase of flow rate, the vortices in the impeller become smaller and the number was significantly decreased except the inlet region of the impeller. The research results on the internal vortex characteristics can be used as a theoretical basis for the optimal design of efficient side channel pumps. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Vortex flow
Controlled terms: Impellers? - ?Numerical models? - ?Pumps? - ?Turbulent flow
Uncontrolled terms: Application range? - ?Commercial software? - ?Side channel pumps? - ?Super-low-specific-speed? - ?Three-dimensional turbulent flow? - ?Unsteady numerical simulations? - ?Vortex characteristics? - ?Vorticity fluctuations
Classification code: 601.2 Machine Components? - ?618.2 Pumps? - ?631.1 Fluid Flow, General? - ?921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2020.03.013
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
28. Potato Coverage Extraction Method Based on Digital Image
Accession number: 20201608416933
Title of translation:
Authors: Wu, Zhichao (1); Li, Changchun (1); Feng, Haikuan (2, 3); Zhai, Liting (1); Wang, Daoyong (4); Yang, Guijun (2, 3)
Author affiliation: (1) School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo; 454000, China; (2) Key Laboratory of Quantitative Remote Sensing in Agriculture, Ministry of Agriculture and Rural Affairs, Beijing Research Center for Information Technology in Agriculture, Beijing; 100097, China; (3) National Engineering Research Center for Information Technology in Agriculture, Beijing; 100097, China; (4) National Engineering Research Center for Agro-Ecological Big Data Analysis and Application, Anhui University, Hefei; 230601, China
Corresponding author: Feng, Haikuan(fenghaikuan123@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 164-170
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Vegetation coverage is an indicator that reflects the basic situation of vegetation. Obtaining digital images of the surface and further extracting vegetation coverage has become a measurement method with the greatest potential for obtaining coverage. In order to use digital images to quickly extract potato coverage, the vegetation coverage extraction algorithm (VCEA) was firstly used to obtain the measured potato coverage from ground digital images, and then the EXG index method and maximum likelihood supervised classification were used to digitally measure the drone image processing to obtain potato coverage in each study area. In addition, a new algorithm that used color conversion space HSI (H-A method) was proposed to quickly extract potato coverage from digital images. Finally, the accuracy of three different methods was used to evaluate and compare the calculation results. The results showed that the accuracy of vegetation coverage estimated by H-A method was the highest, all of which were above 0.91, and the fitting degree of fitting function reached 0.97; the second was supervision classification method, the lowest precision was 0.75, the fitting degree was 0.82, and the worst was EXG index method, the lowest precision was 0.74, the fitting degree was 0.74. Therefore, the accuracy and reliability of H-A method were high. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Image processing
Controlled terms: Extraction? - ?Maximum likelihood? - ?Vegetation
Uncontrolled terms: Calculation results? - ?Classification methods? - ?Color conversions? - ?Extraction algorithms? - ?Extraction method? - ?Maximum likelihood supervised classifications? - ?Measurement methods? - ?Vegetation coverage
Classification code: 802.3 Chemical Operations? - ?922.1 Probability Theory
DOI: 10.6041/j.issn.1000-1298.2020.03.019
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
29. Design and Experiment of Operation Machine for Filming and Covering Soil on Tiny Ridges
Accession number: 20201608416876
Title of translation:
Authors: Dai, Fei (1); Song, Xuefeng (1); Zhao, Wuyun (1); Wei, Wancheng (1); Zhang, Fengwei (1); Ma, Haijun (2)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou; 730070, China; (2) Gansu Tao River Tractor Manufacturing Co., Ltd., Dingxi; 730500, China
Corresponding author: Zhao, Wuyun(zhaowy@gsau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 97-105 and 129
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: For further integration agronomic requirement of planting technique of tiny ridges surface with whole film covering in dry land, in order to meet the requirements of mechanical high performance construction seedbed of whole plastic-film mulching on tiny ridges, a combined operation machine was designed, which synchronously realized institutional operation once such as ridging, filming and covering soil on tiny ridges. Based on the prototype, the important working parts such as the driving system, covering soil system and ridge shaping-pressing device were designed. According to the requirements of related operation performance, the key working parameters such as the amount of soil covered on plastic-film mulching seedbed and the velocity of scraper type soil lifting device were analyzed, and the composition of test factors and their value range were determined. Response surface analysis was applied to optimize working parameters of the operation machine. Parameters such as the operation machine speed, the velocity of scraper type soil lifting device and the inclination angle of covering device were selected as independent variables, which would influence qualified rate of seedbed construction. The mathematical model was established, and then the effects of various parameters and their interactions were analyzed as well. The effects order of three parameters on qualified rate of seedbed construction was obtained. The optimal working parameters of operation machine were operation machine speed of 0.71 m/s, the velocity of scraper type soil lifting device of 0.50 m/s and the inclination angle of covering device of 68°. Confirmatory tests showed that the average value of qualified rate of seedbed construction was 95.6%, compared with before the optimization it was promoted significantly. Application of discrete element method to simulate the dynamic operation process of elevating, conveying and covering soil under the condition of optimal parameters of operation machine. The simulation result was consistent with the field test conditions, which showed that the machine optimization operation parameters calculation was accurate and reliable. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Soils
Controlled terms: Plastic films? - ?Surface analysis? - ?Tools
Uncontrolled terms: Combined operations? - ?Inclination angles? - ?Independent variables? - ?Operation performance? - ?Optimization operation? - ?Planting techniques? - ?Plastic film mulching? - ?Response surface analysis
Classification code: 483.1 Soils and Soil Mechanics? - ?817.1 Polymer Products? - ?951 Materials Science
Numerical data indexing: Percentage 9.56e+01%, Velocity 5.00e-01m/s, Velocity 7.10e-01m/s
DOI: 10.6041/j.issn.1000-1298.2020.03.011
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
30. Effect of Thermal Hydrolysis Pretreatment on Different Sludge Properties and Anaerobic Digestion Performance
Accession number: 20201608416890
Title of translation:
Authors: Li, Wei (1); Li, Rangling (2); Li, Bowen (2); Wang, Jiawei (1); Guo, Jianbin (2); Dong, Renjie (2)
Author affiliation: (1) Research and Development Center, Beijing Drainage Group Co., Ltd., Beijing; 100022, China; (2) College of Engineering, China Agricultural University, Beijing; 100083, China
Corresponding author: Guo, Jianbin(jianbinguo@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: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 326-333
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Sludge was an important by-product of sewage treatment. With the continuous expansion of number and scale of sewage treatment plants, the amount of sludge generated was increased. In the process of sludge stabilization, harmless and resource treatment, hydrothermal pretreatment and anaerobic digestion technology were widely used. In order to compare and analyze the effects of hydrothermal treatment on sludge properties and anaerobic digestion performance of different sources, the viscosity, ammonia nitrogen, pH value, TS components and anaerobic digestion performance of sludge from four different sources were studied. The results showed that under the same hydrothermal temperature treatment, sludge viscosity, ammonia nitrogen concentration and pH value were greatly affected by the sludge source. Hydrothermal pretreatment had a good modification effect on different sludges. The sludge properties remained basically unchanged after the hydrothermal temperature reached 170. There was no significant difference in the gas production rate of sludge from different sources with the increase of OLR, but there were differences in the operation. The gas production performance of anaerobic digestion of sludge from different sources was significantly improved after hydrothermal pretreatment, but there was a significant difference in the proportion of increased gas production rate of VS. Sludge VS gas production rate in Beijing, Shanghai and Shandong was increased by 25.2%~69.8%, as the sludge in Guangxi was pure excess sludge, the gas production rate of VS was increased by 101.6%~133.8% after hydrothermal treatment. However, the increase in gas production per unit VS was not significantly different, and the fluctuation with the change of gas production performance was small, the increase was about 83~218 m3/t (the average was 143 m3/t). After hydrothermal pretreatment, the fluidity of the sludge became better, the high-concentration and high-load feed of anaerobic digestion could be realized, and the capacity reduction rate of the reactor could reach 38%~71%. By analyzing the hydrothermal modification effect and digestion capacity gain of different sewage sources and treatment processes, it was expected to provide reference for the design of sludge hydrothermal and anaerobic digestion processes in different regions. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Sludge digestion
Controlled terms: Ammonia? - ?Anaerobic digestion? - ?Gases? - ?Nitrogen? - ?pH? - ?Sewage treatment plants? - ?Viscosity
Uncontrolled terms: Anaerobic digestion process? - ?Anaerobic digestion technology? - ?Digestion performance? - ?Hydrothermal modification? - ?Hydrothermal pretreatment? - ?Hydrothermal temperature? - ?Hydrothermal treatments? - ?Thermal hydrolysis pretreatment
Classification code: 452.2 Sewage Treatment? - ?631.1 Fluid Flow, General? - ?801.1 Chemistry, General? - ?804 Chemical Products Generally? - ?804.2 Inorganic Compounds
DOI: 10.6041/j.issn.1000-1298.2020.03.037
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
31. Research Progress and Prospect in Plant Phenotyping Platform and Image Analysis Technology
Accession number: 20201608417081
Title of translation:
Authors: Zhang, Huichun (1, 2); Zhou, Hongping (1); Zheng, Jiaqiang (1); Ge, Yufeng (2); Li, Yangxian (1)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing; 210037, China; (2) Biological Systems Engineering Department, University of Nebraska-Lincoln, Lincoln; NE; 68583, United States
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 1-17
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In recent years, the rapid development of plant genomes, but the lack of sufficient phenotypic data limits the ability of humans to analyze the genetics of quantitative traits. This problem can be effectively solved by developing a plant phenotypic monitoring platform. High-throughput, automated and high-resolution phenotyping platform is critical for accelerating crop improvement and breeding strategies for higher yield and disease tolerance. Plant phenotyping has been advancing at an accelerated rate as a response to the need to fill the gap between genomic information and the plasticity of the plant phenome. Domestic and international efforts have been made to develop phenotyping facilities, and these devices are actively contributing to the generation of high-dimensional, richly informative datasets about the phenotype of model and crop plants. The plant phenotypic monitoring platform integrates multiple sensors for quantitative research on complex traits related to growth, yield, and adaptation to biotic or abiotic stresses such as plant height, leaf number and area, root morphology, biomass, and fruit characteristics. The research progress of plant phenotypic monitoring technology and research status of platform at home and abroad was mainly introduced. The research progress of plant phenotypic information collection platform and technology was introduced, and the functions and characteristics of each were summarized and analyzed. Thus, various phenotypic platform based on indoor and field environments were presented together with applications of these platforms with different mounting modes. An overview of the most commonly used sensors that empower digital phenotyping and the information they provide were presented. Function and feature of each phenotype platform was also analyzed. Meanwhile, an in-depth analysis of image processing with its major issues was given, and the algorithms that were used or emerged as useful to obtain data out of images in an automatic fashion. In this review, the current and emerging methods of image acquisition and processing that allow image-based phenomics were covered. The main bottlenecks that still remained in the field was concluded and the application prospect of plant phenotypic monitoring technology and platform were expected, which pointed out the following challenges: developing plant phenotyping platform of multi-sensor integrated system, introducing plant growth environment monitoring module into plant phenotypic information collection platform, designing forest phenotypic information collection platform, conducting integration and mining phenotype data captured by sensors, collecting the phenotypic data of underground part by nondestructive in situ plant root measurement technology, building unified open standards for phenotypic data and prompting interdisciplinary cooperation. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 106
Main heading: Image analysis
Controlled terms: Crops? - ?Nondestructive examination
Uncontrolled terms: Application prospect? - ?Environment monitoring? - ?Fruit characteristics? - ?Information collections? - ?Interdisciplinary cooperations? - ?Measurement technologies? - ?Monitoring technologies? - ?Quantitative research
Classification code: 821.4 Agricultural Products
DOI: 10.6041/j.issn.1000-1298.2020.03.001
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
32. Response Characteristics and Quantitative Monitoring Models Analyzed Using in situ Leaf Hyperspectra under Different Cd Stress Conditions
Accession number: 20201608416934
Title of translation:
Authors: Li, Lantao (1); Shen, Fengmin (1); Ma, Wenlian (1); Fan, Jie (1); Li, Yarong (1); Liu, Haitao (1)
Author affiliation: (1) College of Resources and Environment, Henan Agricultural University, Zhengzhou; 450002, China
Corresponding author: Liu, Haitao(liuhaitao@henau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 146-155
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Accurate and nondestructive estimation of cadmium (Cd) status of Cichoriumintybus L. is important for site-specific crop heavy metal stress management. Aiming to rapidly and precision assessment of leaf Cd concentration in Cichoriumintybus L., a hydroponic experiment with three cultivars, i.e., Europea chicory, America chicory and Qianyu no.1 chicory, was conducted in Henan Agricultural University from Dec. 2018 to Mar. 2019. Seven different Cd concentration treatments (0 μmol/L, 5 μmol/L, 10 μmol/L, 25 μmol/L, 50 μmol/L, 100 μmol/L and 200 μmol/L) were established with five replications per treatment, and the in situ leaf hyperspectra were taken on at six-leaf and ten-leaf stages. Meanwhile, chemical assays of these Cichoriumintybus L. samples were performed in the laboratory. Moreover, data from an independent experiment under 50 μmol/L Cd stress condition with nine varieties in Mar. 2019 was also collected to test the transferability of the established optimal monitoring model for leaf Cd concentration prediction. After correlation analysis, stepwise regression (SWR), principal component regression (PCR) and partial least square (PLS) were used to perform the relationship between raw spectral reflectance (R), the first derivative reflectance (FDR) and leaf Cd concentration, respectively. The results showed that leaf Cd concentration in Cichoriumintybus L. was increased with the increase of Cd stress conditions, and the changes in situ leaf spectral reflectance under varied Cd rates were highly significant in the visible-near infrared region (400~1 300 nm), with consistent patterns across the different cultivars and growth stages. Using a validation dataset, the best models were calculated with the FDR-PLS method, which yielded the highest coefficient of determination (R2) of 0.92 and the lowest root mean square error (RMSE) and relative percent deviation (RPD) of 181.3 mg/kg and 2.96, respectively. The variable importance in projection (VIP) score resulting from PLS regression model was used to determine the effective wavelengths and reduce the dimensionality of the hyperspectral reflectance data. The newly developed FDR-PLS model using the effective wavelengths (659 nm, 725 nm, 907 nm, 1 026 nm, 1 112 nm, 1 255 nm and 1 630 nm) performed well in leaf Cd concentration prediction with R2 of 0.834 and RPD of 2.41. The validation in the nine varieties’ experiments also indicated an excellent accuracy between the observed and predicted values for leaf Cd concentration (R2 was 0.817, and RPD was 1.77). The overall results demonstrated the applicability and feasibility of the FDR-PLS model for estimating the Cd status of Cichoriumintybus L. using in situ leaf hyperspectral reflectance data. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Pollution
Controlled terms: Agricultural robots? - ?Cadmium? - ?Infrared devices? - ?Mean square error? - ?Plants (botany)? - ?Principal component analysis? - ?Reflection? - ?Regression analysis
Uncontrolled terms: Coefficient of determination? - ?Hyperspectral reflectance? - ?Leaf hyperspectral reflectance? - ?Partial least square (PLS)? - ?Principal component regression? - ?Response characteristic? - ?Root mean square errors? - ?Visible near infrared regions
Classification code: 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals? - ?922.2 Mathematical Statistics
Numerical data indexing: Molar_Concentration 0.00e+00mol/m3, Molar_Concentration 1.00e-01mol/m3, Molar_Concentration 1.00e-02mol/m3, Molar_Concentration 2.00e-01mol/m3, Molar_Concentration 2.50e-02mol/m3, Molar_Concentration 5.00e-02mol/m3, Molar_Concentration 5.00e-03mol/m3, Size 1.03e-06m, Size 1.11e-06m, Size 1.26e-06m, Size 1.63e-06m, Size 4.00e-07m to 1.30e-06m, Size 6.59e-07m, Size 7.25e-07m, Size 9.07e-07m
DOI: 10.6041/j.issn.1000-1298.2020.03.017
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
33. Design and Experiment of Incisal-burying and Ploughing Combined Machine for Astragalus smicus Green Manure in Full-bloom Stage
Accession number: 20201608416935
Title of translation:
Authors: You, Zhaoyan (1); Zhang, Chong (1); Gao, Xuemei (1); Gao, Ya (1); Peng, Baoliang (1); Wu, Huichang (1)
Author affiliation: (1) Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing; 210014, China
Corresponding author: Wu, Huichang(huichangwu@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 78-86
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to realize high-efficiency and low energy-consumption mechanized ploughing operation in the large-scale planting area of Astragalus smicus green manure, based on the structure placement idea of front-end buried-cutting and back-end overturning, an incisal-burying and ploughing combined machine with no power input for Astragalus smicus green manure in its flourishing period was designed. The biological characteristics and pressure-shear strength test of Astragalus smicus in full-bloom stage were studied, and then the key components such as roller components, front suspension connection components and grid-type plough were designed. Through theoretical calculation and mechanical analysis, the radius of press-cutting roller for smooth incisal-burying of Astragalus smicus stalks was 305 mm, and the sliding cutting angle was ranged from 34.3° to 55.7°, the grid-type plough surface was designed by using the horizontal straight element method, the parabolic equation of the guide curve was derived and the influence regularity of plough element-line angle was drawn as well. The results of field overturning test of Astragalus smicus green manure in full-bloom stage showed that with the operation speed of 5.8~6.0 km/h, the qualified rate of stem-cutting length was 92%, the stability variation coefficient of tillage width was 3.7%, the stability variation coefficient of tillage depth was 5.6%, the rate of soil fragmentation was 85.6%, and the rate of vegetation overturning coverage was 98.3%, the test indexes met the requirements of national and industrial standards. The designed incisal-burying and ploughing combined machine can work efficiently up to 0.67~1.20 hm2/h, which was obviously superior to the conventional overturning modes such as animal plough, mouldboard plough and rotary tiller in terms of overturning quality and the combination pattern, and had good popularization and application value. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Manures
Controlled terms: Agricultural machinery? - ?Agriculture? - ?Blooms (metal)? - ?Energy utilization? - ?Fertilizers? - ?Horizontal wells? - ?Rollers (machine components)
Uncontrolled terms: Biological characteristic? - ?Industrial standards? - ?Low energy consumption? - ?Parabolic Equations? - ?Shear strength tests? - ?Sliding cutting angles? - ?Theoretical calculations? - ?Variation coefficient
Classification code: 512.1.1 Oil Fields? - ?525.3 Energy Utilization? - ?535.1.2 Rolling Mill Practice? - ?601.2 Machine Components? - ?804 Chemical Products Generally? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Numerical data indexing: Percentage 3.70e+00%, Percentage 5.60e+00%, Percentage 8.56e+01%, Percentage 9.20e+01%, Percentage 9.83e+01%, Size 3.05e-01m, Velocity 1.61e+00m/s to 1.67e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.03.009
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
34. Position Control Performance of Hydraulic Electric Hybrid Linear Drive System
Accession number: 20201608417037
Title of translation:
Authors: Hao, Yunxiao (1); Xia, Lianpeng (1); Ge, Lei (1); Wang, Xiangyu (1); Quan, Long (1)
Author affiliation: (1) Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education/Shanxi Province, Taiyuan University of Technology, Taiyuan; 030024, China
Corresponding author: Quan, Long(quanlong@tyut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 379-385
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The existing hydraulic system uses proportional valve or servo valve to control the position of hydraulic cylinder, resulting in very large throttling loss. In order to improve the hydraulic system energy efficiency, a hydraulic electric hybrid linear drive system adopting electro-mechanical linear actuator and hydraulic cylinder was proposed. In order to suppress the coupling effect between the electro-mechanical linear actuator and hydraulic cylinder, the hydraulic pump and the proportional valve were used to control the output force and operation direction of the hydraulic cylinder to meet the load force requirement of the system. The electro-mechanical linear actuator was used to control the operation position of the load. Meanwhile, in the electric motor current control loop of the electro-mechanical linear actuator, the hydraulic cylinder output force fluctuation and external interference force can be compensated. In order to realize the above target, an adaptive sliding mode control method based on extended state observer was designed for the electro-mechanical linear actuator. Based on the load force estimated by the extended state observer, the hydraulic cylinder output force can be open-loop controlled by adjusting the pressure of the hydraulic pump and the opening of the proportional valve. In the proposed system, the function of the proportional valve was controlling the move direction of the hydraulic cylinder most of the time. Thus, the throttling loss can be greatly reduced. The operation performance and the energy efficiency characteristics of the hydraulic-electric hybrid driving system were analyzed through simulation and test. The results showed that the proposed system had good position control performance and high energy efficiency. Compared with the traditional valve controlled system, the proposed system’s energy consumption can be reduced by 51%. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Hydraulic actuators
Controlled terms: Cylinders (shapes)? - ?Electric machine control? - ?Electromechanical actuators? - ?Energy efficiency? - ?Energy utilization? - ?Hydraulic drives? - ?Hydraulic equipment? - ?Linear actuators? - ?Mechanical actuators? - ?Pneumatic control equipment ? - ?Position control? - ?Sliding mode control? - ?State estimation? - ?Valves (mechanical)
Uncontrolled terms: Adaptive sliding mode control? - ?Efficiency characteristic? - ?Extended state observer? - ?External interference force? - ?High energy efficiency? - ?Linear drive systems? - ?Operation performance? - ?Proportional valves
Classification code: 525.2 Energy Conservation? - ?525.3 Energy Utilization? - ?601.2 Machine Components? - ?632.2 Hydraulic Equipment and Machinery? - ?731 Automatic Control Principles and Applications? - ?732.1 Control Equipment
Numerical data indexing: Percentage 5.10e+01%
DOI: 10.6041/j.issn.1000-1298.2020.03.044
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
35. Effect of Cavitation Microjet on Structure and Properties of Rice Bran Protein Thermal Aggregates
Accession number: 20201608416897
Title of translation:
Authors: Zhou, Linyi (1, 2); Wang, Chen (1); Wang, Zhongjiang (2); Liu, Jun (3); Li, Ruheng (1)
Author affiliation: (1) College of Engineering, Dali University, Dali; 671000, China; (2) College of Food, Northeast Agricultural University, Harbin; 150030, China; (3) Linyi Yuwang Plant Protein Industry Co., Ltd., Linyi; 251500, China
Corresponding author: Li, Ruheng(47787114@qq.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 341-349
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The heat-soluble aggregates were prepared by heat treatment (pH value 7.2, 100, 20 min), and the cavitation microjet of different pressures (0, 30 MPa, 60 MPa, 90 MPa, 120 MPa) were respectively applied to the thermal aggregates. Impacts of cavitation microjet treatment on structural characteristics (3D microstructure, molecular weight distribution, functional group, particle size, potential and hydrophobicity) and emulsifying properties (emulsification and emulsion stability) of soluble rice bran protein aggregate were investigated by using soluble rice bran protein as a control. The results showed that compared with the heat-soluble aggregates, 3D microstructure height and particle size, total free sulfhydryl content, the average particle size and β-sheet content were reduced to the lowest point after cavitation microjet treatment (90 MPa), and the structure became loose; the surface hydrophobicity, emulsifying property and emulsion stability reached the maximum value, which was increased by 798.05, 90.32 m2/g and 281.68 min, respectively, compared with the heat-soluble aggregate. Low-pressure (30~90 MPa) micro-jet treatment would reduce the hot-soluble aggregate particles, convert the insoluble aggregate into soluble aggregates, and increase the emulsifying properties, while high pressure (120 MPa) would cause the protein to aggregate and the emulsifying properties would be slightly reduced. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 38
Main heading: Emulsification
Controlled terms: Aggregates? - ?Cavitation? - ?Hydrophobicity? - ?Jets? - ?Metallographic microstructure? - ?Molecular weight distribution? - ?Particle size? - ?Proteins
Uncontrolled terms: Average particle size? - ?Different pressures? - ?Emulsifying property? - ?Insoluble aggregates? - ?Soluble aggregates? - ?Structural characteristics? - ?Structure and properties? - ?Surface hydrophobicity
Classification code: 406 Highway Engineering? - ?531.2 Metallography? - ?631.1 Fluid Flow, General? - ?631.1.1 Liquid Dynamics? - ?802.3 Chemical Operations? - ?804.1 Organic Compounds? - ?931.2 Physical Properties of Gases, Liquids and Solids? - ?931.3 Atomic and Molecular Physics
Numerical data indexing: Pressure 1.20e+08Pa, Pressure 3.00e+07Pa, Pressure 3.00e+07Pa to 9.00e+07Pa, Pressure 6.00e+07Pa, Pressure 9.00e+07Pa, Specific_Surface_Area 9.03e+04m2/kg, Time 1.20e+03s, Time 1.69e+04s
DOI: 10.6041/j.issn.1000-1298.2020.03.039
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
36. Design and Experiment of Potato Storage Equipment Control System
Accession number: 20201608416860
Title of translation:
Authors: Wang, Xiangyou (1); Li, Shaochuan (1); Wang, Faming (2); Li, Xueqiang (2); Li, Tengxun (1); Wang, Rongming (1)
Author affiliation: (1) School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo; 255000, China; (2) Shandong Star Agricultural Equipment Co., Ltd., Dezhou; 253600, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 363-370
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to solve the problems of unsuitable storage and management and poor storage effect, a set of potato storage environment control system was designed according to the technological conditions of potato storage. The system used temperature sensor, humidity sensor and CO2 concentration sensor to monitor the environmental parameters in real time. By adjusting the inlet air window and outlet air window, fan, compressors and humidification device, the environment temperature parameters in callus period, the temperature, humidity and CO2 concentration in storage period were regulated. The purpose was to make the storage environment attain the requirements of potato storage. In the temperature accuracy test of each measuring point, the temperature error of each measuring point was within -0.3~0.3, and the temperature range of each measuring point was 0.6, the monitoring temperature was basically the same as the real temperature on the whole. In the experiment of regulation effect, the temperature of callus period and storage period was within the allowable range of the system set value, while the temperature outside the storage had little effect on the temperature inside the storage, and the humidity and CO2 concentration could be controlled within a reasonable range. Therefore, it was very important to improve the storage environment of potato, accelerate the postharvest callus, prolong the storage period and ensure the quality of potato. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Food storage
Controlled terms: Carbon dioxide? - ?Control systems? - ?Humidity control
Uncontrolled terms: CO2 concentration? - ?Environment control systems? - ?Environment temperature? - ?Environmental parameter? - ?Humidification devices? - ?Technological conditions? - ?Temperature accuracies? - ?Temperature error
Classification code: 694.4 Storage? - ?731.1 Control Systems? - ?804.2 Inorganic Compounds
DOI: 10.6041/j.issn.1000-1298.2020.03.042
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
37. Stability of Pickering Emulsions Prepared by Different Crystallinity Index Values Chitin Nanocrystals
Accession number: 20201608417065
Title of translation:
Authors: Li, Yang (1); Liu, Zhao (1); Hu, Miao (1); Xie, Fengying (1, 2); Wang, Chan (1); Qi, Baokun (1)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China; (2) Harbin Food Industry Research Institute, Harbin; 150028, China
Corresponding author: Qi, Baokun(qibaokun22@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 334-340
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Chitin nanocrystals (ChN) with different crystallinity index values were obtained by acid hydrolysis method, and O/W type Pickering emulsion was prepared by homogeneous synergistic ultrasonic technology. The crystallinity index values and functional groups of chitin nanoparticles were calculated and analyzed by X-ray diffraction and Fourier infrared spectroscopy. The microstructure, interfacial contact angle, thermal stability, physical stability, creaming stability and storage stability of the emulsion were determined. The effect of different crystallinity index values of ChN on emulsion stability was analyzed. Result showed that acid hydrolysis did not destroy the chitin functional group, but acid hydrolysis can change the crystallinity index values of chitin, and the crystallinity index values of ChN obtained at the acid hydrolysis of 2.5 h was the largest, which was 78.15%; the emulsion prepared by ChN with high crystallinity index values formed a more stable network structure, and ChN was more attached to the oil-water interface, so that the emulsion had a smaller interface contact angle and increased the hydrophilicity of the emulsion; it was also found that the ChN stable emulsion with high crystallinity index values had good thermal stability index and physical stability index, which were 63% and 69.52%, respectively; the emulsion analysis stability was good, and the emulsification index was less than 1%. In addition, the ChN-stabilized emulsion did not stratify after storage for 30 days at room temperature, and had good storage stability, and the emulsion with the highest crystallinity index values had the smallest particle size. Therefore, a stable O/W Pickering emulsion can be prepared by increasing the crystallinity index values of the chitin nanocrystals. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Emulsification
Controlled terms: Chitin? - ?Contact angle? - ?Crystallinity? - ?Hydrolysis? - ?Hydrophilicity? - ?Infrared spectroscopy? - ?Nanocrystals? - ?Ostwald ripening? - ?Particle size? - ?Particle size analysis ? - ?Stability? - ?Thermodynamic stability
Uncontrolled terms: Crystallinity index? - ?Emulsification index? - ?High crystallinity? - ?Interfacial contact? - ?O/W Pickering emulsions? - ?Oil water interfaces? - ?Pickering emulsions? - ?Ultrasonic technology
Classification code: 641.1 Thermodynamics? - ?761 Nanotechnology? - ?802.2 Chemical Reactions? - ?802.3 Chemical Operations? - ?804.1 Organic Compounds? - ?931.2 Physical Properties of Gases, Liquids and Solids? - ?951 Materials Science
Numerical data indexing: Age 8.22e-02yr, Percentage 1.00e+00%, Percentage 6.30e+01%, Percentage 6.95e+01%, Time 9.00e+03s
DOI: 10.6041/j.issn.1000-1298.2020.03.038
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
38. Effects of Poplar Wood Biochar on Northeast Region Black Soil Adsorbing Nitrogen in Pig Biogas Slurry
Accession number: 20201608417017
Title of translation:
Authors: Wang, Lili (1); Cao, Zhen (1); Liu, Zhuo (1); Xu, Minghan (2); Li, Yibo (1); Wang, Zhongjiang (1, 3)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China; (2) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China; (3) Heilongjiang Key Laboratory of Technology and Equipment for the Utilization of Agricultural Renewable Resources, 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: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 295-305
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Poplar wood biochar was added as adsorbent into two types of northeast region black soil (loamy and sandy) to investigate the effects of poplar wood biochar on black soil adsorbing ammonium and nitrate nitrogen in pig biogas slurry, and the adsorption mechanism was studied by using oscillation method. Commercial activated carbon was used as a standard for comparison. The effects of the particle sizes (0.25 mm, 0.5 mm and 1 mm) and addition proportions (2%, 5% and 10%) of commercial activated carbon and poplar wood biochar, the initial mass concentration of pig biogas slurry, the oscillation time and the oscillation temperature on black soil adsorbing ammonium and nitrate nitrogen in pig biogas slurry were studied systematically. The adsorption mechanism was analyzed by different isothermal and kinetic adsorption models. The results showed that the smaller particle sizes and the more addition proportions of commercial activated carbon and poplar wood biochar led to better ammonium and nitrate nitrogen adsorption capacity of black soil in pig biogas slurry. And 0.25 mm particle size and 10% solid weight ratio were optimum addition treatment for commercial activated carbon and poplar wood biochar. Under optimum addition treatment, the ammonium and nitrate nitrogen amount adsorbed by black soil with poplar wood biochar addition were higher than that by pure black soil by 388.7%, 296.3% (black loamy soil) and 453.13%, 333.33% (black sandy soil), and were lower than those by back soil with commercial activated carbon addition by 19.71%, 10.08% (black loamy soil) and 12.38%, 7.14% (black sandy soil), respectively. However, the effects of poplar wood biochar and commercial activated carbon on the ammonium and nitrate nitrogen concentration of pig biogas slurry after adsorptive stability were not significantly different, and all the differences were less than 2.5%. The ammonium nitrogen amount adsorbed by the pure black soil, the pure commercial activated carbon and pure poplar wood biochar and the black soil with commercial activated carbon and poplar wood biochar addition were all increased as the increase of temperature, posing endothermic reaction. While the nitrate nitrogen adsorption amount showed a decreasing trend as temperature was increased, posing spontaneous exothermic reaction. Furthermore, the ammonium and nitrate adsorption processes showed three stages of fast adsorption, slow adsorption and balance. The adsorption models of Freundlich, Langmuir and Pseudo-second order described the isothermal adsorption characteristics and kinetic adsorption characteristics of the black soil added with commercial activated carbon and poplar wood biochar adsorbing ammonium and nitrate nitrogen in pig biogas slurry precisely. However, Freundlich was superior to Langmuir. Therefore, there were multi-layers uneven physisorption reaction and monolayer chemisorption reaction during the ammonium and nitrate adsorption process, concurrently. The more adsorption amount was, the more desorption amount was, but the desorption amount was much less than the effective adsorption amount. The effective ammonium and nitrate nitrogen adsorption amount of black soil with poplar wood biochar addition were lower than those of black soil with commercial activated carbon addition by 14.57%, 9.19% (black loamy soil) and 5.34%, 5.74% (black sandy soil). Poplar wood biochar was favorable for improving the nitrogen adsorption capacity of northeast region black soil and decreasing the nitrogen loss of pig biogas slurry. The results provided good insights into improving the northeast region black soil by using poplar wood biochar and pig biogas slurry. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 42
Main heading: Gas adsorption
Controlled terms: Activated carbon? - ?Addition reactions? - ?Biogas? - ?Desorption? - ?Dyes? - ?Isotherms? - ?Mammals? - ?Monolayers? - ?Nitrates? - ?Nitrogen ? - ?Particle size? - ?Physisorption? - ?Sand? - ?Soils? - ?Wood
Uncontrolled terms: Adsorption characteristic? - ?Adsorption mechanism? - ?Commercial activated carbons? - ?Endothermic reactions? - ?Isothermal adsorption? - ?Kinetic adsorption models? - ?Nitrate adsorptions? - ?Nitrogen adsorption capacities
Classification code: 483.1 Soils and Soil Mechanics? - ?522 Gas Fuels? - ?802.2 Chemical Reactions? - ?802.3 Chemical Operations? - ?803 Chemical Agents and Basic Industrial Chemicals? - ?804 Chemical Products Generally? - ?804.2 Inorganic Compounds? - ?811.2 Wood and Wood Products
Numerical data indexing: Percentage 1.00e+01%, Percentage 1.01e+01%, Percentage 1.24e+01%, Percentage 1.46e+01%, Percentage 1.97e+01%, Percentage 2.00e+00%, Percentage 2.50e+00%, Percentage 2.96e+02%, Percentage 3.33e+02%, Percentage 3.89e+02%, Percentage 4.53e+02%, Percentage 5.00e+00%, Percentage 5.34e+00%, Percentage 5.74e+00%, Percentage 7.14e+00%, Percentage 9.19e+00%, Size 1.00e-03m, Size 2.50e-04m, Size 5.00e-04m
DOI: 10.6041/j.issn.1000-1298.2020.03.034
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
39. Design and Experiment of Pre-detection Active Leveling Agricultural Chassis for Hilly Area
Accession number: 20201608418053
Title of translation:
Authors: Liu, Pingyi (1); Ke, Chengpeng (1); Ke, Ting (1); Li, Haitao (1); Wei, Wenjun (1); Zhao, Chen (1)
Author affiliation: (1) College of Engineering, China Agricultural 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: 3
Issue date: March 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: Aiming at the problem of low precision and hysteresis for the agricultural chassis in the hilly area, a pre-detection active leveling method was proposed to detect the ground situation ahead of the road and determine how to implement the leveling action and actively adjust the body while tilting. It can actively prevent, reduce or avoid the body tilt during driving on rough terrain. An agricultural vehicle pre-detection active leveling chassis with Y-shaped adjustable suspension as the leveling mechanism was designed. The chassis suspension adjustment and pre-detection leveling parameters, load capacity and leveling speed and leveling execution strategy were analyzed and calculated. The analytical calculations showed that the chassis can be leveled by the height adjustment of each Y-shaped adjustable suspension. The prototype was developed and tested on the rugged ground in the outdoor test field. The test results showed that the active pre-detection leveling chassis of the hilly mountain was controlled well that the accuracy of both roll angle and pitch angle just was within 0.5°, verifying the pre-detection active leveling method and the feasibility of the active leveling chassis for agricultural pre-detecting in hilly mountains, and providing theoretical basis and experimental reference for the promotion and application of agricultural chassis in hilly mountainous areas,which had high practical value in the future. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Chassis
Controlled terms: Agricultural robots? - ?Agriculture? - ?Automobile bodies? - ?Landforms
Uncontrolled terms: Agricultural vehicles? - ?Analytical calculation? - ?Execution strategies? - ?Leveling mechanism? - ?Load capacity? - ?Mountainous area? - ?Pitch angle? - ?Rough terrains
Classification code: 481.1 Geology? - ?662.4 Automobile and Smaller Vehicle Components? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI: 10.6041/j.issn.1000-1298.2020.03.043
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
40. Dynamic Characteristics of Different Emitters Clogging in Drip Irrigation with Muddy Water
Accession number: 20201608417016
Title of translation:
Authors: Wen, Shenglin (1, 2); Niu, Wenquan (1, 3); Wu, Menglong (1, 2); Zhang, Wenqian (1, 2); Li, Xuekai (1, 2); Yang, Xiaokun (1, 2)
Author affiliation: (1) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling; Shaanxi; 712100, China
Corresponding author: Niu, Wenquan(nwq@vip.sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 287-294
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore the influence of emitter type on the process of emitter clogging in drip irrigation with muddy water,seven kinds of emitters were selected and two kinds of muddy water were allocated for periodic intermittent irrigation tests. Clogging characteristics of different emitters were compared by putting forward the emitter structure coefficient. The results showed that the type of emitter was an important factor affecting the blockage of emitter, and the structure coefficient of emitter could be used as an important index to measure the anti-blockage performance of the different emitters. The anti-clogging performance of emitter was increased with the increase of structure coefficient. When the structure coefficients were the same, the relative flow rate of the cylindrical emitter was larger than that of the flat emitter after two different muddy water tests. For example, when the structure coefficient was 2%, the relative flow rate of the cylindrical emitter was 91.66% and 79.63%, respectively. However, the relative flow rate of the flat emitter was only 75.84% and 65.08%. With the increase of irrigation times, the overall blockage of most emitters was more likely to occur in the flat emitters than in the cylindrical emitters. The clogging mass of different emitters was decreased with the increase of structure coefficient. The order of the structure coefficient of cylindrical emitters and flat emitters in descending trend was E1, E2, E3 and E4, E5, E7, E6. However, the order of the emitters clogging mass after two kinds of muddy water tests in descending trend was E3, E2, E1 and E6, E7, E5, E4. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 34
Main heading: Irrigation
Uncontrolled terms: Anti-clogging? - ?Drip irrigation? - ?Dynamic characteristics? - ?Emitter clogging? - ?Emitter structures? - ?Intermittent irrigations? - ?Muddy waters? - ?Relative flow
Classification code: 821.3 Agricultural Methods
Numerical data indexing: Percentage 2.00e+00%, Percentage 6.51e+01%, Percentage 7.58e+01%, Percentage 7.96e+01%, Percentage 9.17e+01%
DOI: 10.6041/j.issn.1000-1298.2020.03.033
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
41. Determination of Phosphorus Content in Phosphorus-containing Feed by EDXRF Method
Accession number: 20201608416874
Title of translation: EDXRF
Authors: Deng, Yufu (1, 2); Liu, Yichu (1, 2); Zhao, Tingwei (1, 2); Meng, Dechuan (1, 2); Yu, Guiying (3)
Author affiliation: (1) College of Physical Science and Technology, Shenyang Normal University, Shenyang; 110034, China; (2) Ray Instrumentation Engineering Technology Research Center of Liaoning Province, Shenyang; 110034, China; (3) Experimental Teaching Center, Shenyang Normal University, Shenyang; 110034, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 358-362 and 222
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A new method for the determination of light element phosphorus in feed by energy dispersive X-ray fluorescence (EDXRF) analysis was proposed. An indirect measurement was applied, and the target elemental phosphorus was converted into quinoline phosphomolybdate by a series of chemical reactions. After washing, filtration and drying, the content of molybdenum element in the sample was measured by EDXRF. And according to the relationship between the phosphorus element and the molybdenum element in the chemical products, the content of phosphorus can be calculated. The optimum determining conditions of molybdenum element were also investigated. By calculating the peak-to-back ratio of character line of molybdenum element, the relation curve was drawn. The optimal tube voltage of molybdenum element was 27 kV, the optimal tube current was 9 μA, and the best measuring time was 120 s. In this experiment, the content of phosphorus in phosphorus-containing feed was 22.36%, the relative standard deviation was 0.46%, and the relative range was 0.24%. The consequence was in accord with the result of the melting method (X-ray fluorescence analysis). The analytical method of combination of physics and chemistry was put forward, some problems such as low detection efficiency and poor measurement accuracy were conquered, and the results showed that the experiment had good accuracy, stability and repeatability. The method provided a new way for measurement of phosphorus in feed, and showed good reference and directive significance for the determination of other light element content by EDXRF as well. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 17
Main heading: Phosphorus
Controlled terms: Chemical analysis? - ?Energy dispersive spectroscopy? - ?Fluorescence? - ?Molybdenum? - ?Molybdenum compounds? - ?X rays
Uncontrolled terms: Detection efficiency? - ?Directive significance? - ?Energy dispersive X-ray fluorescence? - ?Indirect measurements? - ?Measurement accuracy? - ?Phosphorus contents? - ?Relative standard deviations? - ?X ray fluorescence analysis
Classification code: 543.3 Molybdenum and Alloys? - ?741.1 Light/Optics? - ?804 Chemical Products Generally? - ?932.1 High Energy Physics
Numerical data indexing: Electric_Current 9.00e-06A, Percentage 2.24e+01%, Percentage 2.40e-01%, Percentage 4.60e-01%, Time 1.20e+02s, Voltage 2.70e+04V
DOI: 10.6041/j.issn.1000-1298.2020.03.041
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
42. Wetland Classification Based on Multi-temporal GF1-WFV and GF3-FS Polarization Features
Accession number: 20201608417073
Title of translation: GF1-WFVGF3-FS
Authors: Wang, Huan (1); Zhang, Chao (1, 2); Yun, Wenju (2, 3); Lü, Yahui (1); You, Shucheng (4); Wei, Hai (4)
Author affiliation: (1) College of Land Science and Technology, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory for Agricultural Land Quality Monitoring and Control, Ministry of Natural Resources, Beijing; 100035, China; (3) Land Consolidation and Rehabilitation Center, Ministry of Natural Resources, Beijing; 100035, China; (4) China Land Survey and Planning Institute, Beijing; 100035, China
Corresponding author: Zhang, Chao(zhangchaobj@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: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 209-215
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: According to the seasonal variation of wetland and the difference of vegetation cover in different wetland types, the multi-temporal GF1-WFV remote sensing data and polarization features of GF3-FS data were comprehensively used to research on wetland fine classification method. Firstly, totally 50 high importance feature values from the spectral information, vegetation index and water index of thirteen GF1-WFV remote sensing data were optimized, which used OOB sample of random forests, and the 50 high importance feature values were used to preliminary classification of wetland. Then, aiming at the problem that marsh grassland, shrub swamp and marsh land were mixed in the classification results, and the recognition accuracy of some wetland types was low, the separation degree of backscattering features was analyzed from two dimensions of intensity and amplitude by using the GF3-FS HH and HV polarization data of vigorous vegetation growth, optimized σFD-HH feature was used for wetland types classification. Finally, taking Da’an City in Jilin Province as the research area to verify and analyze the method. The results showed that the overall accuracy of wetland classification reached 86.23% with Kappa coefficient of 0.82. The results can provide technical support for wetland resource investigation and management. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Classification (of information)
Controlled terms: Decision trees? - ?Polarization? - ?Remote sensing? - ?Vegetation? - ?Wetlands
Uncontrolled terms: Classification methods? - ?Classification results? - ?Overall accuracies? - ?Recognition accuracy? - ?Remote sensing data? - ?Seasonal variation? - ?Spectral information? - ?Wetland classification
Classification code: 716.1 Information Theory and Signal Processing? - ?961 Systems Science
Numerical data indexing: Percentage 8.62e+01%
DOI: 10.6041/j.issn.1000-1298.2020.03.024
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
43. Design and Experiment of Double-gear Type Fertilizer Apparatus
Accession number: 20201608416918
Title of translation:
Authors: Dun, Guoqiang (1); Yu, Chunling (1); Guo, Yanling (1); Ji, Wenyi (2); Islam, K.R. (3); Du, Jiaxing (4)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin; 150040, China; (2) College of Engineering, Northeast Agricultural University, Harbin; 150030, China; (3) Soil, Water and Bioenergy Resources Program, The Ohio State University South Centers, Piketon; OH; 45661, United States; (4) Jiamusi Branch of Heilongjiang Academy of Agricultural Sciences, Jiamusi; 154007, China
Corresponding author: Guo, Yanling(guo.yl@hotmail.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 87-96
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the fertilizer performance, a double-gear fertilizer apparatus was designed. Aiming to optimize the fertilizer performance, the discrete element simulation technology was used. The pressure angle of gear tooth and the interval of fertilizer wheel were taken as test factors. The coefficient of variation of fertilization uniformity was measured as test indicators, and the influence of various factors on the indicators was obtained and analyzed. The results of single factors simulation test showed that fertilizer apparatus had relatively small coefficient of variation of fertilization uniformity. When pressure angle and fertilizer wheel interval was at 15°~25° and 4~6 mm, respectively. According to the results of single factor experiment, a quadratic general rotation unitized design method was conducted, and regression equations of two key structural parameters and coefficient of variation of fertilization uniformity were established. The results showed that coefficient of variation was increased at first, and then decreased with the increase of pressure angle and fertilizer wheel interval. When they were 19.52° and 4.7 mm respectively, coefficient of variation of fertilization uniformity was minimum, in this case, the coefficient of variation of theoretical calculation value and simulation test value were 15.30% and 14.58% respectively, and the deviation was only 0.72 percentage point, the regression model was accurate and credible. In order to validate the regression model established by simulation test and optimization effect of structure parameters, a bench test of double-gear fertilizer apparatus with the optimized structure parameters combination of fertilizer wheel was carried out. The results showed that fertilizer discharge flow rate can be adjusted linearly by the speed of fertilizer wheel. The average coefficient of variation was 15.42%, which was basically consistent with simulation test value and theoretical calculation value. Under the same condition, the coefficient of variation of outer groove-wheel fertilizer apparatus was 20.29%. The coefficient of variation of beach test was increased by 31.58%. It obviously improved the fertilization uniformity. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Fertilizers
Controlled terms: Regression analysis? - ?Structural design? - ?Structural optimization? - ?Testing? - ?Wheels
Uncontrolled terms: Coefficient of variation? - ?Discharge flow rates? - ?Discrete element simulation? - ?Optimization effects? - ?Optimized structures? - ?Single-factor experiments? - ?Structural parameter? - ?Theoretical calculations
Classification code: 408.1 Structural Design, General? - ?601.2 Machine Components? - ?804 Chemical Products Generally? - ?921.5 Optimization Techniques? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 1.46e+01%, Percentage 1.53e+01%, Percentage 1.54e+01%, Percentage 2.03e+01%, Percentage 3.16e+01%, Size 4.00e-03m to 6.00e-03m, Size 4.70e-03m
DOI: 10.6041/j.issn.1000-1298.2020.03.010
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
44. Regression Correction of Hargreaves-Samani Equation by Monthly under Framework of China’s Agricultural Comprehensive Zoning
Accession number: 20201608416957
Title of translation: Hargreaves-Samani
Authors: Xia, Xingsheng (1, 2); Pan, Yaozhong (1, 3); Zhu, Xiufang (2, 4); Zhang, Jinshui (2, 4)
Author affiliation: (1) State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing; 100875, China; (2) Institute of Remote Sensing Science and Engineering, Beijing Normal University, Beijing; 100875, China; (3) School of Geographical Sciences, Qinghai Normal University, Xining; 810016, China; (4) State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing; 100875, China
Corresponding author: Zhu, Xiufang(zhuxiufang@bnu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 258-267
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to verify the applicability of the linear regression correction scheme for Hargreaves-Samani (HS) equation under the framework of agricultural comprehensive division of China, by using 124 stations meteorological data from 1957 to 2016 released by China Meteorological Data Service Center, the multi-year reference crop evapotranspiration ET0-PM and ET0-HS were calculated by monthly based on Penman-Monteith (PM) equation and the HS, respectively. Then, taking ET0-PM as the true value, linear regression analysis method was used to collect the monthly correction coefficients a and b of the HS by ET0-PM and ET0-HS from 1957 to 2010 for 38 agricultural management sub-areas of China. Thirdly, by comparing the relative error changes before and after ET0-HS correction during 2011-2016, the applicability of HS equation linear regression correction method in China’s agricultural areas was verified. Lastly, combined with the specific error results during 2011-2016, the optimal monthly values of the HS correction coefficients a and b in each agricultural area were determined. The results showed that the ET0-PM and ET0-HS had good correlation (more than 0.6) in most months and in most agricultural areas. Therefore, the regression analysis can be carried out. Coefficient a obtained by regression correction had a significant seasonal change, while coefficient b was relatively stable, which implied that there were obvious seasonal differencing between ET0-PM and ET0-HS. There were relative errors for ET0-HS before and after correction in different degrees, but the error range of ET0-HS after correction was significantly reduced. In specific verification applications, ET0-HS after correction was not the best result for all areas in each month. Therefore, the optimization of a and b coefficients was the best scheme in practice. The linear regression correction of the HS was a simple and feasible scheme in practice, which had practical significance and popularization value for rapid acquisition of high-precision reference crop evapotranspiration in large-scale area. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Agricultural robots
Controlled terms: Crops? - ?Errors? - ?Evapotranspiration? - ?Linear regression? - ?Meteorology
Uncontrolled terms: Agricultural areas? - ?Agricultural management? - ?Correction coefficients? - ?Correction method? - ?Correction schemes? - ?Meteorological data? - ?Penman-Monteith equations? - ?Reference crop evapotranspirations
Classification code: 821.4 Agricultural Products? - ?922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2020.03.030
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
45. Minimum-inbreeding Configuration for Clonal Seed Orchard
Accession number: 20201608416995
Title of translation:
Authors: Qi, Jiandong (1); Mai, Jingjing (1); Liu, Chunxia (2); Li, Wei (3)
Author affiliation: (1) College of Information Science and Technology, Beijing Forestry University, Beijing; 100083, China; (2) Institute of Software, Chinese Academy of Sciences, Beijing; 100190, China; (3) College of Biological Science and Biotechnology, 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: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 241-248
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The optimal design of clonal seed orchard was carried out to determine a more reasonable ratio of clones, so as to avoid self-crossing and inbreeding between clones, and ensure the consistency of florescence of clones in seed orchard as far as possible, in order to promote effective parental pollination, improve seed yield and quality, and provide reference for the design of high-generation seed orchard. The genetic distance between the parents of Pinus sylvestris var. mongolica Litv. in the National Production Base of Improved Seeds in Honghua’erji of Inner Mongolia Autonomous Region was determined by using SSR markers and Gene Marker V2.2 software. Florescence and pollen range were set, and 13 clones were randomly selected as experimental data. The two-population improved adaptive step-length fruit fly optimization algorithm (TIASFOA) was designed, and improved fruit fly optimization algorithm (IFOA), particle swarm optimization (PSO) and genetic algorithm (GA) were compared and analyzed in three aspects: fitness value, convergence and the number of clones with adjacent or identical flowering period in pollination range. Under genetic distance, flowering and pollen counts were known, the population size of 20~60 was carried out 200 times respectively, the average, maximum, minimum and variance fitness values of TIASFOA were smaller than those of IFOA, PSO and GA. When the population size was 20, the mean value of the sum of number of clones in the same or adjacent florescence of TIASFOA was 125 and 204, respectively, which was larger than that of the other three algorithms. In this population size, TIASFOA can obtain the optimal fitness value of 133.016, which was 0.283 different from the minimum value of 132.733 when the population size was 50. Genetic distance, flowering period and pollen quantity were taken as constraints for optimal calculation, which were closer to the production environment and provided references for the optimal design of clonal seed orchard. In practical application, population scale of 20 can be used to obtain better seed orchard schemes in a short time and maintain the high genetic diversity of seed orchard. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Orchards
Controlled terms: Cloning? - ?Fruits? - ?Genetic algorithms? - ?Health? - ?Optimal systems? - ?Particle swarm optimization (PSO)? - ?Population statistics
Uncontrolled terms: Clonal seed orchards? - ?Genetic distances? - ?Genetic diversity? - ?Inner Mongolia autonomous regions? - ?Optimal calculations? - ?Pinus sylvestris? - ?Population sizes? - ?Production environments
Classification code: 461.6 Medicine and Pharmacology? - ?461.8.1 Genetic Engineering? - ?723 Computer Software, Data Handling and Applications? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?961 Systems Science
DOI: 10.6041/j.issn.1000-1298.2020.03.028
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
46. Effect of Protein Types on Structure and Stability of Fish Oil Microcapsules
Accession number: 20201608417829
Title of translation:
Authors: Li, Yang (1); Xu, Jingwen (1); Yu, Jingwen (1); Guo, Zengwang (1); Teng, Fei (1); Wang, Zhongjiang (1)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Wang, Zhongjiang(wzjname@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 350-357
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Whey protein isolate (WPI), soy protein isolate (SPI) and pea protein isolate (PPI) were used as composite wall materials with maltodextrin, respectively, and lecithin was used as an emulsifier to encapsulate fish oil. The properties of fish oil microcapsules prepared by three proteins were determined by laser particle size analyzer, scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analyzer. The particle size distribution result in descending order was SPI, PPI and WPI, and the emulsifying properties in descending order was WPI, PPI and SPI. The emulsion prepared by WPI showed the smallest particle size, the highest embedding rate and the best oxidation stability. The results of scanning electron microscopy showed that the microcapsule prepared by WPI was spherical and the surface was relatively intact. There were pits and a few holes on the surface of the microcapsules prepared by SPI and PPI. The FTIR of microcapsules revealed that WPI contained high content of α-helix and disordered structure, which were more conducive to encapsulate. Thermogravimetric analysis showed that the three fish oil microcapsules had good thermal stability at temperature below 200, which could meet the processing conditions of general food, while the microcapsules prepared by SPI had the highest thermal stability. Therefore, the properties of fish oil microcapsule prepared by whey protein isolate except for thermal stability were better than that prepared by soybean protein isolate and pea protein isolate. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 43
Main heading: Particle size analysis
Controlled terms: Emulsification? - ?Fish? - ?Fourier transform infrared spectroscopy? - ?Microstructure? - ?Particle size? - ?Proteins? - ?Scanning electron microscopy? - ?Soybean oil? - ?Stability? - ?Thermal processing (foods) ? - ?Thermodynamic stability? - ?Thermogravimetric analysis
Uncontrolled terms: Disordered structures? - ?Laser particle size analyzer? - ?Pea protein isolates? - ?Processing condition? - ?Soy protein isolates? - ?Soybean protein isolates? - ?Thermogravimetric analyzers? - ?Whey protein isolate
Classification code: 641.1 Thermodynamics? - ?801 Chemistry? - ?802.3 Chemical Operations? - ?804.1 Organic Compounds? - ?822.2 Food Processing Operations? - ?951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2020.03.040
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
47. Evaluation and Dynamic Simulation of Ecosystem Service Value in Coastal Area of Fuzhou City
Accession number: 20201608417020
Title of translation:
Authors: Wang, Peijun (1); Sun, Huang (1); Hua, Baolong (1); Fan, Shenglong (1)
Author affiliation: (1) School of Public Management, Fujian Agriculture and Forestry University, Fuzhou; 350002, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 249-257
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: LUCC is an important cause of global ecosystem change. With the global warming and increasing environmental problems, such as the melting of Arctic glaciers and so on, it is more and more realistic to predict the future status of ecosystem services based on changes in the status quo. As an important extension of construction of a new green district in Fuzhou, the coastal area is a new place for the future development of Fuzhou. According to the “Fuzhou New Area Overall Plan” issued by the National Development and Reform Commission, the ecological civilization pioneer zone is one of the important strategic orientations for the development of Fuzhou New Area. Fuzhou New Area will be built into a new green district. Therefore, based on the Landsat TM/OLI data of the fourth phase of the coastal area of Fuzhou City, the land use status data through ENVI manual visual interpretation was obtained. The LUCC was analyzed, and the value of ecosystem service in the coastal area of Fuzhou was evaluated through the value-equalization method of price revision in Fujian Province. Based on the driving factor of LUCC in Fuzhou, the GeoSOS-FLUS model was used. LUCC simulation and dynamic change of ecosystem service value were predicted. The results indicated that the value of ecosystem services in coastal areas of Fuzhou City was increased first and then decreased, and the overall value was between 19.043 9 billion RMB and 20.241 9 billion RMB. The value of ecosystem services of forest land was the highest, which was between 8.630 1 billion RMB and 10.719 4 billion RMB, followed by water land of 5.727 9~6.819 1 billion RMB, grassland of 1.477 2~3.958 4 billion RMB, farmland of 0.593 1~1.015 5 billion RMB, wet land and bare land of 0.000 1~0.428 5 billion RMB. The total value of ecosystem services in the coastal area of Fuzhou under the general development scenario was 18.790 billion RMB. Among them, the value of forest ecosystem services was the highest, reaching 10.377 billion RMB, followed by water land of 6.154 billion RMB, grassland of 1.590 billion RMB, farmland of 535 million RMB, and wetlands of 134 million RMB. The unused land was almost zero. The total value of ecosystem services in the coastal area of Fuzhou under the green development scenario was 19.511 billion RMB. Among them, the forestry ecosystem service value was the highest, reaching 10.639 billion RMB, followed by the water land of 6.374 billion RMB, grassland of 1.601 billion RMB, farmland of 535 million RMB, wetland of 362 million RMB, and the unused land was almost zero. Therefore, in the process of planning and constructing a green new district in the coastal area, the ecological concept should be integrated into the spatial pattern to ensure that certain urban green spaces and other ecological service land reserved during the development and construction process; and the wetlands in the coastal area needed to be properly developed and protected. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 34
Main heading: Ecosystems
Controlled terms: Coastal zones? - ?Farms? - ?Forestry? - ?Global warming? - ?Land use? - ?Wetlands? - ?Zoning
Uncontrolled terms: Development scenarios? - ?Ecosystem service values? - ?Environmental problems? - ?National development? - ?Planning and constructing? - ?Strategic orientation? - ?Value of ecosystem services? - ?Visual interpretation
Classification code: 403 Urban and Regional Planning and Development? - ?443.1 Atmospheric Properties? - ?454.3 Ecology and Ecosystems? - ?471 Marine Science and Oceanography? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI: 10.6041/j.issn.1000-1298.2020.03.029
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
48. Influence of Different Ventilation System on Environment of Nursery Piggery in Winter
Accession number: 20201608416872
Title of translation:
Authors: Li, Xiusong (1, 2); Ye, Zhangying (1); Li, Baoming (3); Feng, Xiaolong (2); Zhu, Songming (1); Shen, Pan (3)
Author affiliation: (1) School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou; 310058, China; (2) Qingdao Bigherdsman Machinery Co., Ltd., Qingdao; 266000, China; (3) College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing; 100083, China
Corresponding author: Zhu, Songming(zhusm@zju.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 317-325
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to study the differences between ground channel ventilation (GCV) and ceiling ventilation (CV) in nursery piggery in winter. The effects of GCV and CV ventilation system on the environment of piggery were studied. The field test method was used to test and analyze the thermal environment and air quality environment of piggery with GCV and CV ventilation modes in a large-scale conservation farm in Guangxi in winter. The result showed that the thermal environment of GCV piggery was better than that of CV piggery. Although there was no significant difference in average temperature of GCV and CV piggery during the test period (p>0.05), the temperature fluctuation of GCV piggery was smaller than that of CV piggery (1.73, PM2.5 and PM10 in GCV piggery was lower than that in CV piggery (p0.05), and the emission rate of air pollutants in GCV piggery was lower than that in CV piggery (p ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 50
Main heading: Ventilation
Controlled terms: Air quality? - ?Ammonia? - ?Heating? - ?Temperature distribution? - ?Testing
Uncontrolled terms: Field test methods? - ?Removal efficiencies? - ?Temperature fluctuation? - ?Thermal environment? - ?Underground airs? - ?Ventilation mode? - ?Ventilation rate? - ?Ventilation systems
Classification code: 451.2 Air Pollution Control? - ?641.1 Thermodynamics? - ?643.5 Ventilation? - ?804.2 Inorganic Compounds
DOI: 10.6041/j.issn.1000-1298.2020.03.036
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
49. Extraction of Forest Gaps in Natural Forest and Man-made Forest Based on UAV LiDAR
Accession number: 20201608416866
Title of translation: LiDAR
Authors: Mao, Xuegang (1, 2); Du, Zihan (1); Liu, Jiaqian (1); Chen, Shuxin (1)
Author affiliation: (1) School of Forestry, Northeast Forestry University, Harbin; 150040, China; (2) Key Laboratory of Sustainable Forest Ecosystem Management, Ministry of Education, Northeast Forestry University, Harbin; 150040, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 3
Issue date: March 25, 2020
Publication year: 2020
Pages: 232-240
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to explore results of classification and extraction of forest gaps in forest based on active remote sensing, the classification accuracy and applicability of the threshold method were compared, including the pixel-oriented method and the object-oriented method in natural forest and man-made forest based on unmanned aerial vehicle (UAV) light detection and ranging (LiDAR). Maoershan Forest Farm in Harbin, Heilongjiang Province and Wangyedian Forest Farm in Chifeng, Inner Mongolia Autonomous Region were selected as the natural forest experimental site and the man-made forest experimental site respectively. The threshold method, the pixel-oriented method and the object-oriented method were applied to classify the two experimental sites into three classes based on UAV LiDAR acquired, which were forest gap, non-forest gap and others. The research results indicated that the object-oriented method produced the highest classification accuracy and Kappa coefficient in both experimental sites, which were 82.43% and 0.73 in natural forest and 91.74% and 0.88 in man-made forest, respectively. The accuracy and Kappa coefficient of the pixel-oriented method was lower than that of the object-oriented method, which was 76.62% and 0.64 in natural forest and 78.68% and 0.68 in man-made forest. The accuracy and Kappa coefficient of the threshold method had larger difference. It produced the lowest accuracy in natural forest (50.54% and 0.27) and the higher accuracy in man-made forest (79.12% and 0.69). The object-oriented method and the pixel-oriented method were the methods with general applicability in classification of natural forest and man-made forest and could produce ideal accuracy and Kappa coefficient. The threshold method produced lower accuracy in natural forest and was more suitable for classification of man-made forest, forest height of which was similar and where others such as buildings and roads were rare. The best classification method of natural forest was the object-oriented method and the best of man-made forest was the threshold method. The research results provided method reference and technology support for extraction of forest gaps in natural forest and man-made forest. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 33
Main heading: Forestry
Controlled terms: Aircraft detection? - ?Antennas? - ?Extraction? - ?Optical radar? - ?Pixels? - ?Remote sensing? - ?Unmanned aerial vehicles (UAV)
Uncontrolled terms: Classification accuracy? - ?Classification methods? - ?Inner Mongolia autonomous regions? - ?Kappa coefficient? - ?Light detection and ranging? - ?Object oriented method? - ?Technology support? - ?Threshold methods
Classification code: 652.1 Aircraft, General? - ?716.2 Radar Systems and Equipment? - ?802.3 Chemical Operations
Numerical data indexing: Percentage 5.05e+01%, Percentage 7.66e+01%, Percentage 7.87e+01%, Percentage 7.91e+01%, Percentage 8.24e+01%, Percentage 9.17e+01%
DOI: 10.6041/j.issn.1000-1298.2020.03.027
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
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