2018年第10期共收錄49篇
1. Design and Experiment of Precision Hole-fertilizing Apparatus with Notched Plate
Accession number: 20185206314760
Authors: Liu, Zhengdao (1); Wang, Qingjie (1); Liu, Chunge (2); Li, Hongwen (1); He, Jin (1); Liu, Junxiao (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China
Corresponding author: Wang, Qingjie(wangqingjie@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 137-144 and 355
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Extensive fertilization method is one of the main reasons for the low utilization rate of fertilizer in China. Compared with the strip-type fertilization, the hole-type fertilization method can effectively improve the efficiency of fertilizer utilization, but currently there is a lack of mature hole-type fertilization equipment. In view of the above problems, a kind of notched precision hole-fertilizing apparatus was designed, which was used for granular fertilizer. The main structure and working parameters of the device were determined through theoretical analysis, and the analyzing of the shape of fertilizer cavity was focused on. The discrete element method (EDEM) was used to simulate and analyze the filling performance and fertilizer group movements under different conditions. The simulated results showed that the fertilizer cavity shape, operation speed and the fertilizing amount had significant influence on the fertilizing amount coefficient of variation between holes. With the increase of the operating speed and the reduction of fertilizing amount, the variation coefficient of fertilizing amount between holes was increased. Circular-type fertilizer cavity had the best stability in four kinds of shapes. The operating speed and fertilizer cavity shape had significant influence on the fertilizer disturbance coefficient. The time of fertilizer plate passing through the box and the form and size of disturbance on the fertilizer were main reasons affecting the stability of fertilization. Taking the qualified rate of fertilizing amount and coefficient of variation between holes as indicators, four types of fertilizer plates were arranged as verification test of at working speed of 7 km/h and fertilizing amount of 300 kg/hm2. The results showed that the performance of the circular-type fertilizer cavity was the best with fertilizing amount qualified rate of 94% and the variation coefficient between holes was 6.5%, which satisfied the requirements of hole-fertilizing. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Fertilizers
Controlled terms: Plates (structural components)? - ?Structural optimization
Uncontrolled terms: Coefficient of variation? - ?Discrete element simulation? - ?Granular fertilizers? - ?Hole-fertilization? - ?Simulated results? - ?Utilization rates? - ?Variation coefficient? - ?Verification tests
Classification code: 408.2 Structural Members and Shapes
Structural Members and Shapes
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?921.5 Optimization Techniques
Optimization Techniques
Numerical data indexing: Percentage 6.50e+00%, Percentage 9.40e+01%, Velocity 1.94e+00m/s
DOI: 10.6041/j.issn.1000-1298.2018.10.015
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
2. Fuzzy Adaptive Control Method for Autonomous Rice Seeder
Accession number: 20185206314749
Authors: Zhang, Yan (1); Li, Yanming (1); Liu, Xiangpeng (1); Tao, Jianfeng (1); Liu, Chengliang (1); Li, Ruichuan (2)
Author affiliation: (1) School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China; (2) Shandong Wuzheng (Group) Co., Ltd., Rizhao; 262399, China
Corresponding author: Li, Yanming(ymli@sjtu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 30-37
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the performance of autonomous navigation system of direct seeding machine in paddy field and other harsh environments, an optimal control method was proposed. It can adaptively adjust PD control parameters based on fuzzy logic. According to the kinematic model of chain system, the state space model was established. Then, according to the optimal control theory, the PD controller was designed. The range of parameters of Kp was from 0.8 to 2.1 and Kd was from 1.0 to 3.5, which were determined by the field experiment. Finally, the fuzzy adaptive optimal control method was put forward. Simulation result showed that the fuzzy adaptive optimal control method can improve the stability and rapidity compared with the PD controller. The experiment results showed that the mean absolute lateral deviation of the method was less than 0.021 m on the cement pavement. And the mean absolute lateral deviation of the method in paddy field was less than 0.040 m. The method can effectively improve the stability and rapidity of the autonomous navigation control system compared with PD controller and pure pursuit controller. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Controllers
Controlled terms: Control theory? - ?Convergence of numerical methods? - ?Fuzzy control? - ?Fuzzy logic? - ?Kinematics? - ?Navigation systems? - ?State space methods
Uncontrolled terms: Autonomous navigation? - ?Autonomous navigation systems? - ?Fuzzy-adaptive control? - ?Optimal control methods? - ?Optimal control theory? - ?Optimum control? - ?Rice seeder? - ?State - space models
Classification code: 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
? - ?731 Automatic Control Principles and Applications
Automatic Control Principles and Applications
? - ?731.1 Control Systems
Control Systems
? - ?732.1 Control Equipment
Control Equipment
? - ?921 Mathematics
Mathematics
? - ?921.6 Numerical Methods
Numerical Methods
? - ?931.1 Mechanics
Mechanics
Numerical data indexing: Size 2.10e-02m, Size 4.00e-02m
DOI: 10.6041/j.issn.1000-1298.2018.10.004
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
3. Output Characteristics Analysis and Experiment of Multi-output Radial Piston Pump
Accession number: 20185206314794
Authors: Wen, Desheng (1); Sui, Guangdong (1); Feng, Peikun (1); Tian, Shanheng (1); Wang, Shaopeng (1); Liu, Xiaoxue (1)
Author affiliation: (1) School of Mechanical Engineering, Yanshan University, Qinhuangdao; 066004, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 418-426
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The existing quantitative pump cannot meet the multi-stage flow of single pump output. In order to solve the problem of different flow levels of the traditional hydraulic system, the variable pump and control of valve and auxiliary components were used to meet the working condition requirements. The multi-output radial piston pump was a new hydraulic component designed according to the “double stator theory”. It utilized its structural specificity to achieve output flow diversity. According to the principle of force balance and the principle of crank-slider mechanism, the kinematics of multi-output radial piston pump was analyzed. By analyzing the flow pulsation of the pump under different working modes, the working mode with minimum flow pulsation was determined. Theoretical analysis showed that the flow pulsation curve of the non-adjacent two columns of plungers was similar to the output flow pulsation curve of the adjacent two columns of plungers, and the curve periodicity of the different working modes was related to the periodicity of the single column plunger curve. When the pump output maximum flow, the pulsation amplitude and pulsation period of the oil flow were much smaller than the single output. Using the pump prototype, the principle experiment of the pump was carried out. The experimental results showed that the actual flow rate of the pump was continuously decreasing as the pump outlet pressure was increased. However, due to limited processing conditions, the machining accuracy of some parts cannot be guaranteed, resulting in experimental results. The theoretical analysis did not match, and the experimental data analysis verified the correctness of the principle and structural rationality of the pump, which laid a foundation for the research and development of the radial piston pump in the future. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Pistons
Controlled terms: Experiments? - ?Hydraulic equipment? - ?Machining? - ?Reciprocating pumps
Uncontrolled terms: Crank slider mechanisms? - ?Experimental data analysis? - ?Flow pulsation? - ?High pressure? - ?Output characteristics? - ?Radial piston pump? - ?Research and development? - ?Structural specificity
Classification code: 604.2 Machining Operations
Machining Operations
? - ?612.1.1 Internal Combustion Engine Components
Internal Combustion Engine Components
? - ?618.2 Pumps
Pumps
? - ?632.2 Hydraulic Equipment and Machinery
Hydraulic Equipment and Machinery
? - ?901.3 Engineering Research
Engineering Research
DOI: 10.6041/j.issn.1000-1298.2018.10.049
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
4. Inversion of Cadmium Content in Agriculture Soil Based on SGA-RF Algorithm
Accession number: 20185206314774
Authors: Wang, Xuanhui (1, 2); Chen, Jianyi (2); Zheng, Xilai (1); Zhu, Cheng (3); Wang, Xuanli (4); Shan, Chunzhi (5)
Author affiliation: (1) Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao; 266100, China; (2) Science and Information College, Qingdao Agricultural University, Qingdao; 266109, China; (3) Project Management Department, China Unicom Ji’nan Software Research Institute, Ji’nan; 250000, China; (4) Information Engineering and Automation Department, Shanxi Institute of Technology, Yangquan; 045000, China; (5) The Environmental Monitoring Center of North China Sea, Qingdao; 266033, China
Corresponding author: Zheng, Xilai(zhxilai@ouc.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 261-269
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In the field of hyperspectral detection on heavy metal pollution levels in agricultural soils, the accuracy and stability of hyperspectral inversion model for soil cadmium were seriously affected by the high dimensional and high redundancy characteristics in visible/NIR spectra. In order to solve the above problems, Spearman’s rank correlation analysis-based genetic algorithm by using random forest (SGA-RF) was proposed to select the characteristic wavelength from hyperspectral data. On the first-layer of feature selection stage, Spearman correlation analysis-based feature selection method was applied to remove redundancy between all spectra features and retain the characteristic wavelength which was the most relevant to the cadmium content. On the second-layer of feature selection stage, a new fitness function based on random forest was proposed, which perfectly combined the strong global search ability of genetic algorithm and the high inversion ability of random forest. With the proposed fitness function to evaluate the viability of individuals, the distinguishing ability between similar individuals was improved and a subset of optimal spectra feature set with minimum redundancy and maximum differentiation were obtained. In order to verify the validity of the proposed algorithm, totally 124 representative soil samples collected from the Dagu River Basin were chosen as samples. The optimal feature subset which contained 37 sensitive wavelengths was chosen and used to build soil available cadmium content inversion model, and its performance was compared with that of current feature selection methods. Results indicated that the minimum numbers of wavelength features was selected and meanwhile the prediction performance had lower predictive root mean square error of 0.060 1, higher correlation coefficient of 0.950 2 and residual predictive deviation of 2.03. As an important step for the quantitative inversion of cadmium concentration by using visible/NIR spectra, the research could provide some theoretical basis for monitoring soil heavy metal pollution. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Soil pollution
Controlled terms: Agriculture? - ?Cadmium? - ?Correlation methods? - ?Decision trees? - ?Feature extraction? - ?Genetic algorithms? - ?Mean square error? - ?Metal analysis? - ?Pollution detection? - ?Redundancy ? - ?River pollution? - ?Soils
Uncontrolled terms: Agriculture soils? - ?Cadmium content? - ?Random forests? - ?Spearman’s rank correlation analysis? - ?Wavelength selection
Classification code: 453 Water Pollution
Water Pollution
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals
Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals
? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
? - ?922.2 Mathematical Statistics
Mathematical Statistics
? - ?961 Systems Science
Systems Science
DOI: 10.6041/j.issn.1000-1298.2018.10.029
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
5. Design and Test of Stepped Vibrating Screen with Cross Air for Maize Harvester
Accession number: 20185206314758
Authors: Wang, Lijun (1); Feng, Xin (1); Wu, Zhenchao (1); Li, Rui (1); Cui, Youqiang (1); Li, Yibo (1)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 115-123
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To reduce the loss of maize and ensure certain cleanliness of maize after screening operations, the movement of maize mixture was analyzed in the airflow field, and the stepped screen body was designed based on shell screen. The stepped buffer zone was designed by analyzing the theory of maize’s collision to temporarily retain grains in the stepper and reduce the effect on carrying maize from maize mixture and avoid maize accumulation in the ladder. However, maize debris directly went across the ladder. To make the screen amplitude as 19 mm, the computational fluid dynamics and discrete element method (CFD-DEM) were coupled in the quadratic orthogonal rotational-combinational simulation tests. The factors were the inlet velocity and direction angle of airflow, height of the ladder and vibration frequency of screen. The indexes were the loss and cleanliness of maize grains collected. The test data were analyzed by the response surface method and the regression mathematical models were multi-objective optimized by using Design-Expert software. The results showed that the loss and cleanliness of maize were 1.69% and 98.8%, respectively, when the inlet velocity of airflow was 16m/s, the direction angle of airflow was 25°, the height of the ladder was 8.36 mm, and the vibration frequency of screen was 4.45 Hz. The performances met the requirements of corn harvest. The performance tests were done in the laboratory to verify the accuracy of the simulation results. The rate of maize loss was 2.12% and the cleanliness of maize grains collected was 99.16% after screening. Compared with the flat shell screen, the loss of maize grains across the stepped shell screen was reduced by 1.14 percentage points and the cleanliness of maize grains was increased by 1.98 percentage points. The cleaning performance of screen was improved. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Air
Controlled terms: Computation theory? - ?Computational fluid dynamics? - ?Grain (agricultural product)? - ?Harvesters? - ?Inlet flow? - ?Ladders? - ?Mixtures? - ?Multiobjective optimization? - ?Software testing? - ?Vibrating screens
Uncontrolled terms: Buffer zones? - ?Cleaning devices? - ?Design and tests? - ?Percentage points? - ?Performance tests? - ?Response surface method? - ?Screening operations? - ?Vibration frequency
Classification code: 405.1 Construction Equipment
Construction Equipment
? - ?605.1 Small Tools, Powered
Small Tools, Powered
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
? - ?723.5 Computer Applications
Computer Applications
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?821.1 Agricultural Machinery and Equipment
Agricultural Machinery and Equipment
? - ?821.4 Agricultural Products
Agricultural Products
? - ?921.5 Optimization Techniques
Optimization Techniques
Numerical data indexing: Percentage 1.69e+00%, Percentage 2.12e+00%, Percentage 9.88e+01%, Percentage 9.92e+01%, Size 1.90e-02m, Size 8.36e-03m, Velocity 1.60e+01m/s, Frequency 4.45e+00Hz
DOI: 10.6041/j.issn.1000-1298.2018.10.013
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
6. Spatial Characteristics of Forest Landscape in County Level Based on GIS
Accession number: 20185206314766
Authors: Meng, Chao (1); Wang, Jiping (2); Zhi, Xiaorong (2); Hu, Yanping (3); Zhang, Decheng (3); Wang, Lei (4)
Author affiliation: (1) College of Forestry, Hebei Agricultural University, Baoding; 071000, China; (2) Research Center of Saline and Alkali Land of State Forestry Administration, Chinese Academy of Forestry, Beijing; 100091, China; (3) Research Institute of Forestry Policy and Information, Chinese Academy of Forestry, Beijing; 100091, China; (4) College of Forest, Beijing Forestry University, Beijing; 100083, China
Corresponding author: Wang, Jiping(wjp_gis@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 187-194 and 204
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: As a basic unit to coordinate the relationship between human activities and natural resources, county is an important area to carry out afforestation project and forest landscape resources management. The case study site was Yixian County of Hebei Province, which is well known for its landscape diversity, more forestation and high forest coverage. With the support of geographic information system (GIS) and principal component analysis (PCA), and based on the date of forest resources inventory and land use, the forest landscape patterns and its hierarchical characteristics were studied at county scale. The results showed that woodland landscape accounted for more than 58% of the total area, poplar, Pinus tabulaeformis, oak trees, apricot and other economic forest were the dominant forest landscape; splitting index (SPLIT), Shannon’s diversity index (SHDI) and patch density (PD) exhibited a strong response to the changes in three levels of organizational hierarchy. With the refinement of the organization level, the degree of landscape fragmentation was increased, the area and quantity of the patch were increased gradually. The higher the organization level in the landscape level and patch type level was, the more obvious the trend of forest landscape contagion and cohesion was, in contrast, the more fine the organization level was, the more obvious the forest landscape aggregation and clumpiness was, and the more prominent the edge effect of the landscape patch was. Moreover, it proved that many factors affected forest landscape patterns and coupled with each other, such as terrain, land use type and living environment. From mountain to plain area, with the enhancement of the human activities and forest landscape, the forest landscape fragmentation, complexity of patch shape and its spatial difference were increased gradually. Therefore, the health management of forest landscape resources should be focused on the key indicators such as landscape diversity, spatial segmentation, core patch area and number, and so on. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Geographic information systems
Controlled terms: Information management? - ?Information systems? - ?Information use? - ?Land use? - ?Natural resources management? - ?Principal component analysis? - ?Reforestation
Uncontrolled terms: County? - ?Forest health? - ?Hierarchical characteristics? - ?Landscape pattern? - ?Organizational levels
Classification code: 403 Urban and Regional Planning and Development
Urban and Regional Planning and Development
? - ?903.3 Information Retrieval and Use
Information Retrieval and Use
? - ?922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 5.80e+01%
DOI: 10.6041/j.issn.1000-1298.2018.10.021
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
7. Investigation on Individual Wheat Kernel Quality Prediction Device with Stereoscopic Light Source
Accession number: 20185206314786
Authors: Wu, Tingting (1, 2); Armstrong, P.R. (3); Zhang, Haihui (1, 4); Yang, Ling (1); Gao, Weirui (1)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Shaanxi Key Laboratory of Agricultural Information Perception and Intelligent Service, Yangling; Shaanxi; 712100, China; (3) Center for Grain and Animal Health Research, USDA-ARS, Manhattan; KS; 66502, United States; (4) Key Laboratory of Agricultural Internet of Things, Ministry of Agriculture and Rural Affairs, Yangling; Shaanxi; 712100, China
Corresponding author: Zhang, Haihui(zhanghh@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 363-369
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: For the real-time compositional endophenotype detection of individual wheat kernel, a quantitative and non-destructive device based on near infrared diffuse reflectance was designed and developed. The hardware consisted of a novel stereoscopic light source unit, spectrum acquisition unit and control unit, also the corresponding detection software were presented. NIR miniature LED lamps were placed in six rows multiple eight columns along an aluminum cylindrical tube to provide a constant centripetal light and the 48 lamps were connected in parallel by 16 copper conductor to inform a physically stereoscopic light structure. A pair of infrared radiation sensor was adopted on the top of the cylindrical tube to trigger the NIR spectrometer for spectra collection as a seed fell through the borosilicate glass tubing inside the light source. The spectrometer of Ocean Optics was connected to a PC with its standard interface and pin definitions, which was used to collect spectrum from the top and bottom of the light source in real-time through a bifurcate structure fiber. All the soft functions were designed in C++ language of Visual Studio platform. The real-time diffuse reflectance spectrum of each seed was transferred to absorbance via PC and predicted its real protein content according to a model embedded in the program. In order to set up a reliable prediction model, totally 300 individual wheat samples were collected to acquire absorbance spectra in the range of 900~1 700 nm, and pretreated with standard normal variate correction (SNV) algorithm. Two calibration models were established based on full spectra (FS) and feature wavelengths optimized by successive projections algorithm (SPA) respectively. Data showed that the calibration model based on SPA had a relatively lower determination coefficient (R2) of 0.844 6 in contrast to the R2 value of 0.960 4 based on FS, but the validation model based on SPA had relatively equal prediction accuracy with the model based on FS. For the nine feature wavelengths selected by SPA eliminated the collinearity relationship in spectral data but preserved characteristic of protein on spectrum band with a concise model equation, it was chosen as a superior model and developed in software to predict individual seed protein content online. To verify system design and performance, a series of experiment was conducted for wavelength repeatability, absorbance repeatability and protein predictive repeatability. The results indicated that the compositional detection device based on stereoscopic light source was able to realize fast, nondestructive and real-time detection of protein content for individual seed, also had certain applications potential on other compositional endophenotype detection for wheat and other crop seeds. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Quality control
Controlled terms: Borosilicate glass? - ?C++ (programming language)? - ?Forecasting? - ?Grain (agricultural product)? - ?Infrared devices? - ?Infrared radiation? - ?Light sources? - ?Proteins? - ?Reflection? - ?Spectrometers ? - ?Spectrum analysis? - ?Stereo image processing? - ?Visual languages
Uncontrolled terms: Determination coefficients? - ?Diffuse reflectance spectrum? - ?Near infrared diffuse reflectance? - ?Quality detection? - ?Standard normal variates? - ?Successive projections algorithms (SPA)? - ?System design and performance? - ?Wheat seeds
Classification code: 723.1.1 Computer Programming Languages
Computer Programming Languages
? - ?723.2 Data Processing and Image Processing
Data Processing and Image Processing
? - ?741.1 Light/Optics
Light/Optics
? - ?741.3 Optical Devices and Systems
Optical Devices and Systems
? - ?804.1 Organic Compounds
Organic Compounds
? - ?812.3 Glass
Glass
? - ?821.4 Agricultural Products
Agricultural Products
? - ?913.3 Quality Assurance and Control
Quality Assurance and Control
Numerical data indexing: Size 9.00e-07m to 1.70e-06m
DOI: 10.6041/j.issn.1000-1298.2018.10.041
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
8. Design and Experiment on Blueberry Picking Machine Based on Groove Cam Drive
Accession number: 20185206314755
Authors: Wang, Haibin (1); Li, Zhipeng (2); Jiang, Xuesong (1); Nie, Hongyu (3); Geng, Lei (4)
Author affiliation: (1) College of Engineering and Technology, Northeast Forestry University, Harbin; 150040, China; (2) College of Traffic, Northeast Forestry University, Harbin; 150040, China; (3) College of Mechtronic Engineering, Northeast Forestry University, Harbin; 150040, China; (4) College of Mechanical Engineering, Heilongjiang University of Science and Technology, Harbin; 150027, China
Corresponding author: Li, Zhipeng(984764220@qq.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 80-91
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the picking fruit quality of blueberry machine, a blueberry picking machine was designed based on grooved cam transmission. The key components of the prototype were designed, including the calculation and selection of drive components, distribution of reduction ratio of drive system, and the calculation of cam motion curve. The cam profile curve was derived by the inversion method, and the end execution device of the picking system was designed by using the angle dividing line method. A picking machine model was established in ADAMS. The simulation environment was set up to analyze the dynamics of the picker. The influence of the cam design parameters, the length of each member and the speed of driving element on the picking drive was studied. The blueberry picking test was conducted in the plantation. The extraction efficiency of the slot cam picking machine was 4.6 kg/min, the unripe fruit shedding rate was 3.2%, the mature fruit recovery rate was 83%, and the fruit damage rate was 3.1%. The comparison analysis showed that the quality of the groove cam picker was superior to the traction picker, and the picking efficiency was 13 times of that of manual picking. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Cams
Controlled terms: Dynamic analysis? - ?Efficiency? - ?Fruits? - ?Quality control? - ?Testing
Uncontrolled terms: Blueberry? - ?Comparison analysis? - ?Extraction efficiencies? - ?Inversion methods? - ?Picking efficiency? - ?Picking machines? - ?Reduction ratios? - ?Simulation environment
Classification code: 601.3 Mechanisms
Mechanisms
? - ?821.4 Agricultural Products
Agricultural Products
? - ?913.1 Production Engineering
Production Engineering
? - ?913.3 Quality Assurance and Control
Quality Assurance and Control
Numerical data indexing: Mass_Flow_Rate 7.67e-02kg/s, Percentage 3.10e+00%, Percentage 3.20e+00%, Percentage 8.30e+01%
DOI: 10.6041/j.issn.1000-1298.2018.10.010
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
9. Design of Active Electromagnetic Liquid-cooled Retarder for Heavy Vehicles
Accession number: 20185206314791
Authors: Guo, Wenguang (1); Li, Desheng (1); Ye, Lezhi (1); Zhang, Kai (1); Men, Shuang (1)
Author affiliation: (1) College of Mechanical Engineering and Applied Electronic Technology, Beijing University of Technology, Beijing; 100124, China
Corresponding author: Li, Desheng(dsli@bjut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 396-402
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To solve high power consumption and problem of braking torque heat-fade of the conventional eddy current brake, a new active electromagnetic liquid-cooled retarder was proposed based on the principle of eddy current brake and motor energy regeneration brake. The new type of retarder included a liquid cooled eddy current retarder and a single-phase switched reluctance motor with an outer rotor. The mathematical model of electromagnetic field for the retarder was established. The braking performance of the retarder was predicted by numerical simulation, the opening and closing angle of the switched reluctance motor were optimized, and the energy recovery power of the the switched reluctance motor in the downhill continuous braking, the energy recovered in the emergency braking and start torque at low speed were calculated. At last, tests for the air loss moment, heat-fade of braking toque, power generation performance and power-driven performance were carried out. The test results showed that the eddy current braking torque reached 1 260 N?m at 1 000 r/min. The braking torque was declined by 15% in the continuous braking stage. The braking torque of the motor was increased at first and then decreased with the increase of speed. When the speed was 1 000 r/min, the braking torque of the motor reached the maximum; when the vehicle was slowed down at speed of 35 km/h, the recovery power was up to 94 kW. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Braking performance
Controlled terms: Brakes? - ?Computer simulation? - ?Eddy currents? - ?Electromagnetic fields? - ?Liquids? - ?Numerical models? - ?Recovery? - ?Reluctance motors? - ?Torque
Uncontrolled terms: Braking torque? - ?Eddy current brakes? - ?Eddy current retarder? - ?Energy recovery? - ?Energy regeneration brakes? - ?Heavy vehicle? - ?High power consumption? - ?Switched Reluctance Motor
Classification code: 602 Mechanical Drives and Transmissions
Mechanical Drives and Transmissions
? - ?662.1 Automobiles
Automobiles
? - ?701 Electricity and Magnetism
Electricity and Magnetism
? - ?701.1 Electricity: Basic Concepts and Phenomena
Electricity: Basic Concepts and Phenomena
? - ?705.3.1 AC Motors
AC Motors
? - ?723.5 Computer Applications
Computer Applications
? - ?921 Mathematics
Mathematics
? - ?931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
Numerical data indexing: Percentage 1.50e+01%, Power 9.40e+04W, Rotational_Speed 1.00e+03RPM, Torque 1.26e+03N*m, Velocity 9.72e+00m/s
DOI: 10.6041/j.issn.1000-1298.2018.10.046
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
10. Investigation on Digestion Law and Stability of Peppermint Oil Nanoemulsion
Accession number: 20185206314789
Authors: Wang, Zhongjiang (1); Zhang, Xiaoyuan (1); Che, Jialing (1); Li, Yang (1); Olga, O.B. (2); Jiang, Lianzhou (1)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China; (2) Federal State-owned Budgetary Educational Institution, Higher Vocational Education Kemerovo Institute of Food Science and Technology, Kemerovo; 650056, Russia
Corresponding author: Jiang, Lianzhou(jlzname@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 381-386 and 426
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Investigation was made on the effects of the peppermint oil nanoemulsion on the average particle size, zeta potential, turbidity, FFA release rate and the bioavailability of menthol in vitro simulated digestion process. It was found that peppermint oil was completely packed by SPI and nanoemulsion droplet was in the spherical shape by using confocal laser scanning 3D microscopy to observe the microstructure of peppermint oil nanoemulsion, indicating that the soybean protein was completely adsorbed at the oil-water interface of the nanoemulsion and presented a core shell structure. The results indicated that the FFA release rate and menthol bioavailability of the peppermint oil nanoemulsion prepared by high-pressure-homogenization were much higher than that in the control group of peppermint oil. In the simulated gastric digestion phase, the average particle size and the zeta potential of the nanoemulsion were increased, while the turbidity was decreased and the microstructure of the digestive emulsion showed the phenomenon of droplet polymerization. After the simulated intestinal juice was digested, the interfacial protein of peppermint oil nanoemulsion was hydrolyzed, the oil droplets were digested, the average particle size of the emulsion was decreased, and the absolute value of zeta-potential was increased. The stability of the peppermint oil nanoemulsion was checked by the Turbiscan stability analyzer, and the stability index was found to be 2.8. There was no emulsion floatation and flocculation occurred during the test. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Soybean oil
Controlled terms: Biochemistry? - ?Convergence of numerical methods? - ?Drops? - ?Emulsification? - ?Microstructure? - ?Monoterpenes? - ?Particle size? - ?Proteins? - ?Stability? - ?Turbidity ? - ?Zeta potential
Uncontrolled terms: Average particle size? - ?Bioavailability? - ?Confocal laser scanning? - ?High pressure? - ?High pressure homogenization? - ?Nanoemulsion? - ?Oil water interfaces? - ?Peppermint oil
Classification code: 741.1 Light/Optics
Light/Optics
? - ?801.2 Biochemistry
Biochemistry
? - ?801.3 Colloid Chemistry
Colloid Chemistry
? - ?802.3 Chemical Operations
Chemical Operations
? - ?804.1 Organic Compounds
Organic Compounds
? - ?921.6 Numerical Methods
Numerical Methods
? - ?951 Materials Science
Materials Science
DOI: 10.6041/j.issn.1000-1298.2018.10.044
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
11. Design and Experiment on Pull Type of Tassel Fruit Separation for Carrot
Accession number: 20185206314754
Authors: Zeng, Gongjun (1, 2); Chen, Jianneng (1, 3); Xia, Xudong (1, 3); Ye, Jun (1, 2)
Author affiliation: (1) Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou; 310018, China; (2) Zhejiang Industry Polytechnic College, Shaoxing; 312000, China; (3) Key Laboratory of Transplanting Equipment and Technology of Zhejiang Province, Hangzhou; 310018, China
Corresponding author: Chen, Jianneng(jiannengchen@zstu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 73-79
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Separating carrot tassel from fruit by pulling can meet the requirement of tassel fruit separation better. In order to provide design parameters for pull type carrot tassel fruit separation device, and obtain the best separation effect, the influence of related parameters on the pull rod kinematics characteristics should be analyzed qualitatively. To analyze the influence of relevant parameters on the kinematic characteristics of pull rod accurately, the kinematics model of pulling device type tassel fruit separation should be established. To verify the correctness of the previous theoretical analysis, the pull type carrot tassel fruit separation test device was designed. Then a series of orthogonal tests were carried out to explore the factors that affecting the effect of tassel fruit separation. In the orthogonal testing, the pull rod speed, belt line speed and the angle between pull rod and conveyer belt were test factors. The comparison between the results of test and theoretical analysis showed that the pull rod speed had the biggest influence on carrot tassel fruit separation effect, and angle between pull rod and conveyer belt also had significant effects on carrot tassel fruit separation effect. At the same time, the best combination of parameters in carrot tassel fruit separating device was obtained as follows: pull rod speed was 200 r/min, belt line speed was 1.2 m/s, and angle between pull rod and conveyer belt was 40°. The results showed that the concordance rate in the tassel fruit separation was 97%, the success rate was 94%, and the injury rate was 7.7%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Separation
Controlled terms: Anchorages (foundations)? - ?Belt conveyors? - ?Experiments? - ?Fruits? - ?Kinematics? - ?Speed
Uncontrolled terms: Carrot? - ?Kinematic characteristics? - ?Kinematics analysis? - ?Kinematics characteristics? - ?Kinematics modeling? - ?Orthogonal testing? - ?Pulling type? - ?Separation devices
Classification code: 408.2 Structural Members and Shapes
Structural Members and Shapes
? - ?692.1 Conveyors
Conveyors
? - ?802.3 Chemical Operations
Chemical Operations
? - ?821.4 Agricultural Products
Agricultural Products
? - ?901.3 Engineering Research
Engineering Research
? - ?931.1 Mechanics
Mechanics
Numerical data indexing: Percentage 7.70e+00%, Percentage 9.40e+01%, Percentage 9.70e+01%, Rotational_Speed 2.00e+02RPM, Velocity 1.20e+00m/s
DOI: 10.6041/j.issn.1000-1298.2018.10.009
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
12. Optimal Allocation Strategy for Multi-motor Drive System Based on Model Predictive Control
Accession number: 20185206314792
Authors: Chen, Long (1); Zhu, Bin (1); Sun, Xiaodong (1); Wang, Shaohua (1)
Author affiliation: (1) Automotive Engineering Research Institute, Jiangsu University, Zhenjiang; 212013, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 403-409
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to solve the problem that the driving condition of the electric vehicle (EV) cannot be covered by the high efficiency area of traditional single motor drive system, an optimal allocation strategy for the multi-motor drive system of EV was presented based on model predictive control. Firstly, taking the whole multi-motor drive system as research object, the model of motor and longitudinal dynamic model of automobile were established. The method to improve the efficiency of the vehicle with different front and rear axle motors in the high efficiency area was discussed. Secondly, the efficiency of the motor at specific speed and torque operation points was calibrated by the bench test. It was found that the high efficiency ranges of the two motors covered the working operation points of high speed cruising and low speed startup conditions, respectively. By introducing the driving force distribution ratio of front and rear motors, the efficiency diagram of the two motors was transformed into the vehicle driving efficiency diagram. Thirdly, theoretical analysis and simulation verification of permanent magnet synchronous motor (PMSM) system with model predictive torque control were carried out, showing that the method can ensure the rapid response of torque. Finally, the validity of the range improvement and vehicle efficiency were verified by the hardware in the loop (HIL) experiments. The results showed that the driving force distribution can integrate the high efficiency range of two motors and improve the efficiency of vehicle. Moreover, the model predictive torque control (MPTC) based on the motor benchs parameters can suppress the torque ripple in the low speed range and improve the accuracy of the output torque. The results can provide theoretical basis for the design of distributed driving system. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Electric machine theory
Controlled terms: Electric automobiles? - ?Electric drives? - ?Electric machine control? - ?Electric vehicles? - ?Front axles? - ?Model predictive control? - ?Permanent magnets? - ?Synchronous motors? - ?Torque? - ?Torque control ? - ?Traction motors
Uncontrolled terms: Analysis and simulation? - ?Energy optimization? - ?Hardware in the loops? - ?Longitudinal dynamics? - ?Multi-motor drive? - ?Permanent Magnet Synchronous Motor? - ?Start-up conditions? - ?Torque distribution
Classification code: 662.1 Automobiles
Automobiles
? - ?662.4 Automobile and Smaller Vehicle Components
Automobile and Smaller Vehicle Components
? - ?704.1 Electric Components
Electric Components
? - ?705.3.1 AC Motors
AC Motors
? - ?731.2 Control System Applications
Control System Applications
? - ?731.3 Specific Variables Control
Specific Variables Control
? - ?931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2018.10.047
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
13. Design and Experiment of Discharging Performance of Feeder for Nursery
Accession number: 20185206314762
Authors: Huang, Huinan (1, 2); Wang, Defu (1, 2); Li, Baiqiu (1); Zhang, Junfeng (1); Li, Jiaqi (1)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China; (2) Key Laboratory of Swine Facilities Engineering, Ministry of Agriculture, Harbin; 150030, China
Corresponding author: Wang, Defu(dfwang640203@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 154-162
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: As we all know, China is one of the famous country for swine. with the development of pig breeding industry, it is important to improve feed-discharging uniformity and sufficient flow in unit time of feeders. A new type of feeder for nursery was designed based on characteristics of mass flow. The principal factors which affected the discharging performance of the feeder were determined through comprehensive analysis. In order to optimize the structural and operating parameters of the designed nursery pig feeder, virtual orthogonal test was carried out by discrete element method software with rotational speed, discharge opening diameter, angle of conical wall of the hopper and filling coefficient as experimental factors and coefficient of variation and flow as evaluation indexes. Based on experimental data, a mathematical model was built by using the Design-Expert 8.0.10 software, and the optimum parameters were obtained. The simulation experiment results showed when rotational speed was 45 r/min, discharge opening diameter was 110 mm, angle of conical wall of the hopper was 65°, and filling coefficient was 65%, coefficient of variation was 3.96% and flow was 165.93 g/s. Then the feeder was designed according to above optimized parameters, and the experiment was done. The results showed that the flow pattern of pelleted feed was mass flow; the relative error of coefficient of variation and the flow was 4.14% and 3.92%, respectively. The results were basically consistent with the simulation optimization, and the designed feeder can meet the feeding needs of nursery pig, which can ensure the quality and efficiency of the operation and provide support for the research and development of pig feeders. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Feeding
Controlled terms: Flow patterns? - ?Hoppers? - ?Mammals? - ?Mass transfer? - ?Pelletizing? - ?Software testing? - ?Walls (structural partitions)
Uncontrolled terms: Coefficient of variation? - ?Comprehensive analysis? - ?Feeders? - ?Nursery pig? - ?Optimal design? - ?Performance experiment? - ?Research and development? - ?Simulation optimization
Classification code: 408.2 Structural Members and Shapes
Structural Members and Shapes
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?641.3 Mass Transfer
Mass Transfer
? - ?691.1 Materials Handling Equipment
Materials Handling Equipment
? - ?691.2 Materials Handling Methods
Materials Handling Methods
? - ?723.5 Computer Applications
Computer Applications
Numerical data indexing: Mass_Flow_Rate 1.66e-01kg/s, Percentage 3.92e+00%, Percentage 3.96e+00%, Percentage 4.14e+00%, Percentage 6.50e+01%, Rotational_Speed 4.50e+01RPM, Size 1.10e-01m
DOI: 10.6041/j.issn.1000-1298.2018.10.017
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
14. Applicable Analysis and Parameter Modification of Evapotranspiration Models during Wintertime
Accession number: 20185206314781
Authors: Cheng, Qiang (1); Xu, Qiang (1); Chen, Chao (1); Sun, Yurui (1); Wang, Zhongyi (1); Xue, Xuzhang (2)
Author affiliation: (1) College of Information and Electric Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Research Centre of Intelligent Equipment for Agricultural, Beijing; 100097, China
Corresponding author: Xue, Xuzhang(xuexz@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 317-325
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Field evapotranspiration is an important parameter for crop water requirements estimation and farmland water management, which affects the distribution of soil water and heat parameters during the wintertime and potentially affects crop growth in next spring. So far, Penman-Monteith (PM) model, Priestley-Taylor (PT) model and simultaneous heat and water (SHAW) model are widely used for surface evapotranspiration estimation. However, only the SHAW model is used for the estimation of surface evapotranspiration in wintertime, and the applicability of PM and PT models in the winter still needs to be verified. The accuracy and applicability of the above three models were analyzed and evaluated for estimating surface evapotranspiration in wheat fields overwinter. Parameters in models were modified by considering the latent heat during water-ice phase change. Meteorological parameters and actual evapotranspiration during the winter of 2011-2012 and 2012-2013 were collected in an experimental field, Changping County, Beijing, China. The estimated values using the default or empirical parameters of the three models were compared with the actual measured values, showing that the accuracy of PT model for evapotranspiration was the highest (RMSE was 0.159 mm for the PT model, 0.697 mm for the PM model and 0.390 mm for the SHAW model), but PM and PT models overestimated the evapotranspiration, which were attributed to the solid-liquid and gas-liquid phase changes of soil surface. In order to improve the accuracy of the estimation, a water stress coefficient in the PT and PM models was introduced to modify the three model parameters by using the data of the first year of winter. The results showed that the estimated accuracies of evapotranspiration were significantly improved by the modified PM model (RMSE was 0.159 mm during 2011-2012) and the SHAW model (RMSE was 0.280 mm during 2011-2012). The modified models were used to estimate the surface evapotranspiration in the winter of 2012-2013. The results showed that the accuracy of the three models remained high and acceptable (RMSE was 0.267 mm for PT model, 0.252 mm for PM model and 0.253 mm for SHAW model). In comparison, the PT model had a simple form and required less parameter input. Therefore, the PT model can be preferentially chosen when estimating surface evapotranspiration during wintertime. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Parameter estimation
Controlled terms: Crops? - ?Evapotranspiration? - ?Soil moisture? - ?Water management
Uncontrolled terms: Applicability? - ?Parameter modification? - ?Surface evapotranspiration? - ?Wheat fields? - ?Wintertime
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?821.4 Agricultural Products
Agricultural Products
Numerical data indexing: Size 1.59e-04m, Size 2.52e-04m, Size 2.53e-04m, Size 2.67e-04m, Size 2.80e-04m, Size 3.90e-04m, Size 6.97e-04m
DOI: 10.6041/j.issn.1000-1298.2018.10.036
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
15. Estimation of Maize Evapotranspiration under Drought Stress Based on Large-scale Lysimeter and Genetic Algorithm
Accession number: 20185206314782
Authors: Yuan, Hongwei (1, 2); Cui, Yi (3); Jiang, Shangming (1, 2); Tang, Guangmin (1, 2); Yuan, Xianjiang (1, 2)
Author affiliation: (1) Water Resources Research Institute of Anhui Province and Huaihe River Commission, Ministry of Water Resources, Hefei; 233088, China; (2) Key Laboratory of Water Conservancy and Water Resources of Anhui Province, Hefei; 233088, China; (3) State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin; 300072, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 326-335
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Due to the importance and complexity of crop evapotranspiration estimation under drought stress, maize drought stress special experiment was conducted based on six large-scale weighing lysimeters at Xinmaqiao Irrigation Experimental Station, the empirical parameters a and b of the Angstrom formula were optimized based on the measured solar radiation data from the experimental station, and the calculation results of the reference crop evapotranspiration were optimized, and then the characteristics of maize evapotranspiration under different drought stress scenarios were analyzed, moreover the maize evapotranspiration under drought stress was estimated by using basic crop coefficients, including Kcbini, Kcbmid, and Kcbend and upper limit of crop coefficient Kcmax, which were calibrated by genetic algorithm in the process of estimating maize evapotranspiration under no drought stress based on dual crop coefficient approach. The results showed that early mild water deficit may stimulate the adaptability function of maize, and normal physiological function of that would return after re-watering; water deficit would not only decrease current evapotranspiration of maize, but also generate the cumulative effect, which transferred stress influence to later growth stages; the same drought stress intensity had a more obvious effect on the reproductive growth stage of maize, and it may cause permanent stress; the calibration results of Kcbini, Kcbmid, Kcbend and Kcmax were 0.150, 1.090, 0.152 and 1.400, respectively, and the root mean square error (RMSE) and mean absolute error (MAE) of estimated evapotranspiration results under no drought stress in whole growth period using these crop coefficients were 1.39 mm and 0.97 mm, respectively, which were 6.74% and 8.23% less than those of estimated results based on FAO-56 recommended approach, the means of RMSE, MAE and MRE of estimated evapotranspiration results under two different drought stress scenarios were 1.60 mm, 1.18 mm and 6.73%, respectively. Therefore, the estimation of maize evapotranspiration under drought stress based on dual crop coefficient approach and genetic algorithm were reasonable and reliable, and this research would provide theoretical foundation for formulating suitable irrigation system and reducing risk of agricultural drought loss. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Drought
Controlled terms: Crops? - ?Evapotranspiration? - ?Genetic algorithms? - ?Irrigation? - ?Lysimeters? - ?Mean square error? - ?Risk perception? - ?Scales (weighing instruments)? - ?Soil surveys
Uncontrolled terms: Crop coefficient? - ?Drought stress? - ?Huaibei Plain? - ?Maize? - ?Physiological functions? - ?Reference crop evapotranspirations? - ?Root mean square errors? - ?Theoretical foundations
Classification code: 444 Water Resources
Water Resources
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?821.4 Agricultural Products
Agricultural Products
? - ?914.1 Accidents and Accident Prevention
Accidents and Accident Prevention
? - ?922.2 Mathematical Statistics
Mathematical Statistics
? - ?943.3 Special Purpose Instruments
Special Purpose Instruments
Numerical data indexing: Percentage 6.73e+00%, Percentage 6.74e+00%, Percentage 8.23e+00%, Size 1.18e-03m, Size 1.39e-03m, Size 1.60e-03m, Size 9.70e-04m
DOI: 10.6041/j.issn.1000-1298.2018.10.037
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
16. Formation and Stability of Fish Oil Enriched Biocompatible Nano-emulsion
Accession number: 20185206314790
Authors: Jiang, Lianzhou (1); Qi, Yuman (1); Ma, Chunfang (2); Liu, Baohua (1); Wang, Zhongjiang (1); Li, Yang (1, 3)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China; (2) Shandong Yuwang Ecological Food Industry Co., Ltd., Dezhou; 251200, China; (3) Harbin Food Industry Research Institute, Harbin; 150028, China
Corresponding author: Li, Yang(liyanghuangyu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 387-395
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Soybean protein-phosphatidylcholine was used as the emulsifier to prepare fish oil nano-emulsion by high pressure homogenization technology. The effect of concentrations of soybean protein, phosphatidylcholine and fish oil, and homogenous pressure on the average particle size, PDI, ζ-potential, turbidity of fish oil nano-emulsion were studied. Results with the highest desirability (the mean droplet size was (245±3.1)nm, PDI was 0.226±0.019, ζ-potential was (-30.2±0.6)mV and turbidity was (2 413±34.7)cm-1 was obtained with mass ratio of soybean protein content of 2%,phosphatidylcholine content of 0.2%, fish oil content of 1.5%, and homogenization pressure of 100 MPa. Through the super high-resolution microscopy it was observed that fish oil was embedded in the composite emulsifier and evenly distributed in the emulsion system. Through the stability study of the highest desirability soybean protein-phosphatidylcholine fish oil nano-emulsion, it was found that nano-emulsion was remained stable against coalescence and phase separation for a period of 30 d (storage period) at 4 and 25, respectively. The ability of the soybean protein-phosphatidylcholine fish oil nano-emulsion was stronger than that of Tween20 fish oil nano-emulsion. The highest desirability soybean protein-phosphatidylcholine fish oil nano-emulsion had good ionic resistance ability, and the influence of Ca2+ on stability of nano-emulsions was greater than Na+. In addition, the nano-emulsion was stable under all processing conditions that encountered during food processing at pH value of 7.0~10.0. The developed fish oil nano-emulsion had potential applications in the food industry. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 34
Main heading: Soybean oil
Controlled terms: Biocompatibility? - ?Convergence of numerical methods? - ?Emulsification? - ?Emulsions? - ?Fish? - ?Food processing? - ?Particle size? - ?Phase separation? - ?Proteins? - ?Stability ? - ?Turbidity? - ?Zeta potential
Uncontrolled terms: Average particle size? - ?Fish oil? - ?High pressure homogenization? - ?High-resolution microscopy? - ?Homogenization pressures? - ?Nano-emulsions? - ?Phosphatidylcholine? - ?Soybean proteins
Classification code: 461.9.1 Immunology
Immunology
? - ?741.1 Light/Optics
Light/Optics
? - ?801.3 Colloid Chemistry
Colloid Chemistry
? - ?802.3 Chemical Operations
Chemical Operations
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?804.1 Organic Compounds
Organic Compounds
? - ?822.2 Food Processing Operations
Food Processing Operations
? - ?921.6 Numerical Methods
Numerical Methods
Numerical data indexing: Percentage 1.50e+00%, Percentage 2.00e+00%, Percentage 2.00e-01%, Pressure 1.00e+08Pa
DOI: 10.6041/j.issn.1000-1298.2018.10.045
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
17. Sprinkler Flow Rate Distribution Method in Lateral Moving Variable Rate Irrigation System Based on PWM
Accession number: 20185206314763
Authors: Mo, Jinqiu (1); Zhou, Zhiyu (1); Tao, Shuai (1); Li, Yanming (1)
Author affiliation: (1) School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 163-171
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: During the variable rate irrigation operation of large-sized lateral moving irrigation system based on pulse width modulation (PWM) technique, it is quite difficult to solve the flow rate of each sprinkler from the designed prescriptions of management zones because the spraying areas of sprinklers will overlap with each other. At the beginning, the overlapped water distribution in lateral direction, and the two-dimensional contour plot of overlapped water distribution were gotten based on the feature of single sprinkler water distribution of Nelson R3000. Then four sprinklers were determined to control a management zone and the water distribution rate of spraying area was solved. And on this basis a weighted average method and a genetic algorithm (GA) method based on genetic algorithm were proposed to perform sprinkler flow rate distribution according to the prescription. It was found that the solution accuracy can reach 5% when the change between adjacent prescriptions was less than 33% of the maximum prescription by analyzing the irrigation error in management zone. In order to make up for the reduction of irrigation uniformity caused by GA method, a combined method of weighted average method and GA method was put forward. Related examples had showed that the irrigation error caused by the saltation of adjacent prescriptions can be reduced by the combined method effectively and the irrigation uniformity of management zones where prescriptions changed little can also be guaranteed at the same time. By changing the mapping relationship between sprinkler flow rate and actual irrigation volume in each management zone, this method can be extended to more than four sprinklers controlling a management zone. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Sprinkler systems (irrigation)
Controlled terms: Flow rate? - ?Genetic algorithms? - ?Hose? - ?Pulse width modulation? - ?Statistical methods? - ?Voltage control? - ?Water distribution systems
Uncontrolled terms: Irrigation systems? - ?Irrigation uniformity? - ?Mapping relationships? - ?Rate distributions? - ?Sprinkling uniformity? - ?Variable rate irrigations? - ?Water distributions? - ?Weighted average method
Classification code: 446.1 Water Supply Systems
Water Supply Systems
? - ?619.1 Pipe, Piping and Pipelines
Pipe, Piping and Pipelines
? - ?631 Fluid Flow
Fluid Flow
? - ?731.3 Specific Variables Control
Specific Variables Control
? - ?821.1 Agricultural Machinery and Equipment
Agricultural Machinery and Equipment
? - ?922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 3.30e+01%, Percentage 5.00e+00%
DOI: 10.6041/j.issn.1000-1298.2018.10.018
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
18. Design and Experiment of Bite-model End-effector for Citrus Harvesting by Simulating with Mouth of Snake
Accession number: 20185206314752
Authors: Wang, Yi (1, 2); Xu, Hongbin (1, 2); Zhang, Mao (2); Ma, Jitong (2); Liu, Bo (2); He, Yu (2)
Author affiliation: (1) College of Mechanical Engineering, Chongqing University, Chongqing; 400044, China; (2) College of Mechanical Engineering, Chongqing University of Technology, Chongqing; 400054, China
Corresponding author: Xu, Hongbin(cqhb_dragon@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 54-64
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to improve the picking ability of the harvesting robot, a bite-model end-effector for citrus was designed. The design requirements of the end-effector were obtained by first investigation of the growth of citrus stem, the inclination of the stem and doing statistics was defined, and the shearing requirements of the stem extreme position was lastly analyzed. That the design of the bite-model end-effector can meet the design requirements by simulating the snake mouth structure which followed the snake’s biting action and the special structure of the snake’s mouth bones. Two design ideas were proposed by simplifying the structure of the snakehead skeleton. Based on this, the initial model of the two kinds of mechanism was designed respectively. After the preliminary kinematics analysis, the optimal scheme was determined and the initial model was optimized, and the three-dimensional model of the end-effector was determined. According to the three-dimensional model, the kinematics model of the end-effector was established, and the kinematics analysis and simulation were carried out to ensure the reasonable design of the mechanism. A bite-model end-effector prototype was manufactured, and then it was verified by the citrus harvesting robot developed by the research group in laboratory and outdoor environment. In laboratory environment, the experimental results showed that the cutting success rate was not less than 95% under the condition that the air pressure was 0.6 MPa, the inclination of the stem was 0°, the stem diameter was no more than 4.0 mm, and the overall cutting success rate for different stem inclinations was 97.5%. The total success rate of harvesting citrus in the outdoor environment was 87.5%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Structural design
Controlled terms: Biomimetics? - ?Bionics? - ?End effectors? - ?Harvesting? - ?Kinematics
Uncontrolled terms: Citrus? - ?Harvesting robot? - ?Kinematics analysis? - ?Kinematics modeling? - ?Laboratory environment? - ?Outdoor environment? - ?Special structure? - ?Three-dimensional model
Classification code: 408.1 Structural Design, General
Structural Design, General
? - ?461 Bioengineering and Biology
Bioengineering and Biology
? - ?731.5 Robotics
Robotics
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?931.1 Mechanics
Mechanics
Numerical data indexing: Percentage 8.75e+01%, Percentage 9.50e+01%, Percentage 9.75e+01%, Pressure 6.00e+05Pa, Size 4.00e-03m
DOI: 10.6041/j.issn.1000-1298.2018.10.007
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
19. Design and Experiment of Key Mechanism for Semi-automatic Vegetable Grafting Machine
Accession number: 20185206314753
Authors: Tong, Junhua (1, 2); Ding, Yuhua (1); Wu, Chuanyu (1, 2); Yu, Qingcang (1); Pan, Jinhui (1); Sun, Liang (1)
Author affiliation: (1) Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou; 310018, China; (2) Key Laboratory of Transplanting Equipment and Technology of Zhejiang Province, Hangzhou; 310018, China
Corresponding author: Wu, Chuanyu(cywu@zstu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 65-72
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Semi-automatic grafting machine is widely used in variety of vegetables with a low equipment price. However, its production capacity is relatively low. In order to simplify the operation and improve the efficiency of grafting, a semi-automatic grafting machine for single person to graft rootstock and scion seedlings was designed. The design of the key components of the grafting machine included stock and scion seedlings clamping and rotation mechanism, a seedling holding anti-rotation mechanism and a cutting mechanism. The seedling holding anti-rotation device adopted a double ratchet reverse stop to realize a single motor driven two axles with reverse rotation, which was used to ensure the orderly mating process for the grafting seedlings. The optimized layout design for seedling putting position, clamping, cutting, and grafting position would be convenient for single-person to put rootstock and scion seedlings at the same time. The pumpkin seedlings and loofah seedlings were used for grafting test. The different groups test of single artificial seedling was carried out to analyze the graft success rate and grafting efficiency of the model. The grafting experiments on pumpkin and loofah seedlings showed that the success rate of grafting reached 89%, which was similar to that of artificial grafting. The grafting speed reached 846.3 strains/h, which was nearly 3.3 times of artificial grafting rate. It proved that the semi-automatic grafting machine design met the requirements of factory grafting operations. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Grafting (chemical)
Controlled terms: Automation? - ?Efficiency? - ?Machine components? - ?Machine design? - ?Rotation? - ?Vegetables
Uncontrolled terms: Cutting mechanisms? - ?Double-ratchets? - ?Equipment Prices? - ?Grafting efficiency? - ?Grafting seedlings? - ?Production capacity? - ?Rotation mechanism? - ?Semi-automatics
Classification code: 601 Mechanical Design
Mechanical Design
? - ?601.2 Machine Components
Machine Components
? - ?731 Automatic Control Principles and Applications
Automatic Control Principles and Applications
? - ?802.2 Chemical Reactions
Chemical Reactions
? - ?821.4 Agricultural Products
Agricultural Products
? - ?913.1 Production Engineering
Production Engineering
? - ?931.1 Mechanics
Mechanics
Numerical data indexing: Percentage 8.90e+01%
DOI: 10.6041/j.issn.1000-1298.2018.10.008
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
20. Defining of Permanent Basic Farmland Based on Landscape Pattern and Spatial Autocorrelation
Accession number: 20185206314767
Authors: Luo, Zhijun (1, 2); Zhao, Yue (1, 2); Zhao, Jie (1, 2); Li, Yuanwei (1, 2); Song, Ju (1, 2); Ran, Fengwei (1, 2)
Author affiliation: (1) College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang; 330045, China; (2) Jiangxi Provincal Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology, Nanchang; 330045, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 195-204
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on comprehensive consideration of the comprehensive quality of cultivated land, autocorrelation and landscape patterns, the demarcation of permanent basic farmland is of great significance to regional food security and ecological security. Taking Chongren County as an example, GIS platform and GeoDa software were used to evaluate the comprehensive quality of cultivated land through the construction of comprehensive quality evaluation system of cultivated land, and spatial autocorrelation analysis was carried out according to the results of comprehensive quality assessment, and then according to the results of autocorrelation analysis and the ecological security of cultivated land landscape and correspondence between patterns to describe permanent basic farmland. The soil physical and chemical properties, farming conditions were comprehensively considered into the research, and arable land conditions in the study area, and a permanent basic farmland delineation method was proposed based on the comprehensive quality of farmland, comprehensive quality cluster relationship and cultivated land landscape structure, and delineated permanent basic farmland in Chongren County as 305.94 km2, the ploughed land was more in line with the requirements of the permanent basic farmland, which would contribute to the long-term management and protection of basic farmland, and also provide a reference for the comprehensive quality evaluation of farmland and the demarcation of basic farmland. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Farms
Controlled terms: Autocorrelation? - ?Ecology? - ?Food supply? - ?Land use? - ?Quality control
Uncontrolled terms: Autocorrelation analysis? - ?Chongren County? - ?Farmland? - ?Landscape pattern? - ?Permanent basic farmland? - ?Soil physical and chemical properties? - ?Spatial autocorrelation analysis? - ?Spatial autocorrelations
Classification code: 403 Urban and Regional Planning and Development
Urban and Regional Planning and Development
? - ?454.3 Ecology and Ecosystems
Ecology and Ecosystems
? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
? - ?822.3 Food Products
Food Products
? - ?913.3 Quality Assurance and Control
Quality Assurance and Control
? - ?921 Mathematics
Mathematics
Numerical data indexing: Area 3.06e+08m2
DOI: 10.6041/j.issn.1000-1298.2018.10.022
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
21. Accurate Identification and Location of Corn Rhizome Based on Faster R-CNN
Accession number: 20185206314751
Authors: Yang, Yang (1, 2); Zhang, Yalan (1); Miao, Wei (1); Zhang, Tie (3); Chen, Liqing (1, 2); Huang, Lili (1, 2)
Author affiliation: (1) School of Engineering, Anhui Agricultural University, Hefei; 230036, China; (2) Anhui Intelligent Agricultural Machinery Equipment Engineering Laboratory, Hefei; 230036, China; (3) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China
Corresponding author: Chen, Liqing(13838470472@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 46-53
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to identify and locate the maize rhizomes accurately, a maize rhizome detection network based on the migration learning method was established. The function of human eye recognition to identify and locate the rhizomes of the corn from a complex field environment was simulated, which achieved the function of crawler heat fog machine walking along the corn line. Field image of corn was collected by crawler self-propelled hot fogging machine, construction of a precise identification and location model of corn rhizome based on convolutional neural network, and the “DOG Pyramid” algorithm was used to extract maize rhizome as the target from the images, which constituted the training sample database. Through training network, the single maize rhizome was precisely identified firstly, and then were accurately identified and located in the environment of corn crop. The path tracking was obtained by east square fitting algorithm based on the identified maize rhizome location, and the sliding mode track tracking algorithm was used to control the double differential drive motor of the caterpillar chassis to realize the path tracking. The test result showed that the corn root recognition method can identify and locate the maize rhizomes more accurately, the correct rate of identification and location of corn rhizome reached 91.4%, but the traditional image processing method can only reach 67.3%. It can be seen that the method of identifying maize rhizomes proposed had better positioning accuracy, which can better plan the corn field path accurately. The research results provided the key technical support for the crawler self-propelled hot fogging machine self walking along the intercropping of corn. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Image processing
Controlled terms: Fog dispersal? - ?Location? - ?Motion planning? - ?Neural networks? - ?Plants (botany)
Uncontrolled terms: Convolutional neural network? - ?Detection networks? - ?Double differential? - ?Image processing - methods? - ?Maize rhizome? - ?Migration learning? - ?Positioning accuracy? - ?Recognition methods
Classification code: 443.1 Atmospheric Properties
Atmospheric Properties
Numerical data indexing: Percentage 6.73e+01%, Percentage 9.14e+01%
DOI: 10.6041/j.issn.1000-1298.2018.10.006
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
22. Design and Test on Large-scale Semi-membrane-covered Compost System
Accession number: 20185206314785
Authors: Sun, Xiaoxi (1); Cui, Ruxiu (1); Ma, Shuangshuang (1); Han, Lujia (1); Huang, Guangqun (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China
Corresponding author: Huang, Guangqun(huangguangqun@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 356-362
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on the actual production and scientific research needs of semi-membrane-covered aerobic composting, a kind of energy-saving, environmentally friendly and intelligent semi-membrane covered aerobic composting system was designed, including a master control system, ventilation control system, sensor system and membrane sealing system. Based on the system functional requirements above, the work of designing holistic system, selection of function modules and independent design of each modules was done, specifically including: component selection and structure design of the master control system and ventilation control system, selection of sensors and establishment of monitoring methods, determination of communication methods, design of expansion module, selection of semi-membrane and an establishment of seal fixation solutions for membranes and compost pile and ventilation control program programming of membrane-covered compost system. Based on the above system modules, the device system can realize high-precision real-time monitoring and display of key parameters for composting, flexible and intelligent feedback control of ventilation and oxygen supply, and multi-device wireless communication and other functions. The China’s conventional trough composting model was selected as the composting infrastructure. The performance of aerobic composting with membrane covering was studied by using cow manure from surrounding dairy farms and corn stalks in the planting area as the main compost material. The results showed that during the entire composting process, the maximum temperature of the body exceeded 70 and the duration of high temperature met the requirements for the harmless treatment of manure. The oxygen concentration was maintained at a suitable level (higher than 5%), and the whole aerobic fermentation of the whole body under the film coating process was in good condition. From the actual conditions of the flow rate, frequency, temperature, pressure and oxygen concentration parameters monitored by the system and the realization effect of each functional module, each module of the system operated basically well and can basically realize the data of temperature, pressure, flow rate and frequency. The real-time acquisition, display and export functions enabled the local area network wireless communication functions of the total control system, the wind control system, and the PC, and can realize the function of intelligent feedback mode to adjust the ventilation mode. In general, the research and design of this equipment had a positive effect on the intelligence and greenness of China’s aerobic composting equipment, but the system still needed to be further upgraded to meet the actual production needs of membrane-covered aerobic compost. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Feedback
Controlled terms: Composting? - ?Design? - ?Energy conservation? - ?Fertilizers? - ?Flexible displays? - ?Functional programming? - ?Manures? - ?Membranes? - ?Oxygen supply? - ?Piles ? - ?Ventilation? - ?Wireless telecommunication systems
Uncontrolled terms: Functional requirement? - ?Large scale? - ?Master control systems? - ?Oxygen concentrations? - ?Property tests? - ?Real time acquisition? - ?Scientific researches? - ?Wireless communications
Classification code: 408.2 Structural Members and Shapes
Structural Members and Shapes
? - ?525.2 Energy Conservation
Energy Conservation
? - ?643.5 Ventilation
Ventilation
? - ?721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
? - ?722.2 Computer Peripheral Equipment
Computer Peripheral Equipment
? - ?731.1 Control Systems
Control Systems
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?821.5 Agricultural Wastes
Agricultural Wastes
? - ?951 Materials Science
Materials Science
Numerical data indexing: Percentage 5.00e+00%
DOI: 10.6041/j.issn.1000-1298.2018.10.040
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
23. Task Scheduling Strategies of Parallel Near Infrared Spectral Region Selection on Multi Core and Its Application
Accession number: 20185206314775
Authors: Huang, Hua (1); Zhu, Jie (1); Liu, Guanghao (1); Wu, Xiyu (2); Zhu, Shiping (1)
Author affiliation: (1) College of Engineering and Technology, Southwest University, Chongqing; 400716, China; (2) College of Food Science and Technology, Southwest University, Chongqing; 400716, China
Corresponding author: Zhu, Shiping(zspswu@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 270-274 and 283
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The moving window partial least squares (mwPLS) has higher prediction accuracy in the wavelength selection of near infrared spectroscopy, but the runtime of mwPLS is very long on single core serial algorithm. In order to reduce running time for wavelength selection, the task scheduling strategies on multi core were investigated. Taking interval partial least squares (iPLS) as example on the premise of not changing the prediction accuracy of the serial algorithm, the sequential distribution algorithm (SDA), equal space allocation algorithm (ESAA) and sorting allocation algorithm (SAA) were presented to study the effect of task scheduling strategy on the performance of parallel algorithm. The SAA had the best load balance and the highest parallel efficiency among the three task scheduling strategies. Then, based on the 16 cores cloud computing platform, the SAA was applied to the parallel wavelength selection algorithm of synergy interval partial least squares (siPLS), backward interval partial least squares (biPLS) and mwPLS. Comparing with single core serial algorithm, two cores parallel wavelength selection of biPLS and mwPLS with SAA reduced the runtime from 9.22 h and 55.51 h to 4.98 h and 29.03 h, and totally 45.99% and 47.70% runtime of biPLS and mwPLS were saved, respectively. The experimental results showed that when considering the parallel efficiency and computational cost condition, the two cores parallel algorithm for the four spectral region selection algorithms had the highest parallel efficiency and cost performance among the 1~16 core parallel algorithm. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Computational efficiency
Controlled terms: Efficiency? - ?Infrared devices? - ?Least squares approximations? - ?Multitasking? - ?Near infrared spectroscopy? - ?Parallel algorithms? - ?Scheduling algorithms
Uncontrolled terms: Interval partial least squares? - ?Interval partial least-squares (iPLS)? - ?Moving window partial least squares (MWPLS)? - ?Multi-core parallels? - ?Near-infrared spectral regions? - ?Synergy interval partial least squares? - ?Task-scheduling? - ?Wavelength selection
Classification code: 722.4 Digital Computers and Systems
Digital Computers and Systems
? - ?913.1 Production Engineering
Production Engineering
? - ?921.6 Numerical Methods
Numerical Methods
Numerical data indexing: Percentage 4.60e+01%, Percentage 4.77e+01%, Time 1.05e+05s, Time 2.00e+05s to 1.79e+04s, Time 3.32e+04s
DOI: 10.6041/j.issn.1000-1298.2018.10.030
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
24. Effect of CaCl2 on Aggregates of Whey Protein Concentrate with Adding Fibril Nuclei
Accession number: 20185206314788
Authors: Xu, Honghua (1); Xie, Mingming (1); Ding, Rui (1); Ma, Jinyu (1); Gao, Ziwen (1); Guan, Chen (1)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 375-380
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Whey protein concentrate (WPC) fibril was made at pH value of 2.0 and 90. The investigation focused on the impact of adding CaCl2 on the aggregation of WPC spontaneous, homogeneous nuclei induced WPC and secondary nuclei induced WPC. As adding CaCl2, the properties of the hardness, viscosity and amount of WPC fibril aggregates with formation spontaneous or induced homogeneous/secondary nuclei were all increased, especially for two nuclei induced whey concentrate proteins. Adding CaCl2, the hardness was increased by 1.661 (homogeneous nuclei induced WPC) and 1.821 (secondary nuclei induced WPC) times than that of whey protein concentrate spontaneous, and the viscosity was increased by 2.261 (homogeneous nuclei induced WPC) and 2.479 (secondary nuclei induced WPC) times. The micro morphology using TEM of WPC aggregates was changed from long and semi-flexible fibrils into curly and cluster polymers when mixed CaCl2. And the fluorescence intensity was all decreased by adding CaCl2. It was speculated that because the Th T dye was unable to fully bind with the assembled fibrils. For the two ways of forming fibrils: spontaneous or nuclei induced WPC, there were different results that the aggregation ability of nuclei-induced WPC was even greater than that of spontaneous WPC fibril formation as adding CaCl2. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Chlorine compounds
Controlled terms: Agglomeration? - ?Aggregates? - ?Hardness? - ?Proteins? - ?Viscosity
Uncontrolled terms: CaCl2? - ?Fibrils? - ?Homogeneous nuclei? - ?Secondary nuclei? - ?Whey protein concentrate
Classification code: 406 Highway Engineering
Highway Engineering
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?802.3 Chemical Operations
Chemical Operations
? - ?804.1 Organic Compounds
Organic Compounds
? - ?951 Materials Science
Materials Science
DOI: 10.6041/j.issn.1000-1298.2018.10.043
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
25. Velocity and Position Combined Control of Hydraulic Swing System with Large Inertia
Accession number: 20185206314793
Authors: Huang, Weinan (1); Zhang, Xiaogang (1); Quan, Long (1); Ge, Lei (1)
Author affiliation: (1) Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan; 030024, China
Corresponding author: Zhang, Xiaogang(13603514458@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 410-417
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The position of conventional hydraulic swing system with large inertia is controlled with driver-in-loop. According to the observation, the driver adjusts the handle to control the multiway valve with single degree of freedom. Because the human reaction is slow, the production efficiency and repetitive positioning precision is low, and it is difficult to meet the requirements of engineering operations with high rotary positioning accuracy. Furthermore, the energy consumption is high. To solve the above mentioned problems, based on the separate meter-in and meter-out hydraulic swing system, a velocity and position combined control method was proposed. In this method, a precisely desired position was given as the input signal for the position closed-loop control, and the desired velocity and displacement were S-curves. In addition, the velocity feedforward control and position closed-loop control were used to reduce the tracking error, and the pressure and velocity feedback control were also applied to the swing system to improve smoothness of the working process. Firstly, a three-dimensional co-simulation simulation model was developed, which integrated the multi-body dynamics system and electro-hydraulic system for analyzing the feasibility of this swing system, and the control parameters of the hydraulic components were determined according to hardware and the control strategy developed. Then the system principle and the control strategy were verified and debugged by making a simulation. Besides, an experiment was carried out on a 6-ton hydraulic excavator. The simulation and experiment results demonstrated that high positioning accuracy can be achieved in both forward and reverse moving directions with different desired speeds. The positioning error was about 0.5°~1.5°, and the velocity and pressure fluctuation were all reduced. The maximum fluctuation pressure was decreased by 41.6%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Position control
Controlled terms: Closed loop control systems? - ?Degrees of freedom (mechanics)? - ?Energy utilization? - ?Excavation? - ?Feedforward control? - ?Hydraulic equipment? - ?Precision engineering? - ?Program debugging? - ?Velocity
Uncontrolled terms: Combined control? - ?Electro-hydraulic system? - ?Feed-Forward? - ?Repetitive positioning? - ?Separate meter-in and meter-out? - ?Single degree of freedoms? - ?Swing system? - ?Velocity feedback control
Classification code: 525.3 Energy Utilization
Energy Utilization
? - ?632.2 Hydraulic Equipment and Machinery
Hydraulic Equipment and Machinery
? - ?723.1 Computer Programming
Computer Programming
? - ?731 Automatic Control Principles and Applications
Automatic Control Principles and Applications
? - ?731.3 Specific Variables Control
Specific Variables Control
? - ?931.1 Mechanics
Mechanics
? - ?961 Systems Science
Systems Science
Numerical data indexing: Mass 5.44e+03kg, Percentage 4.16e+01%
DOI: 10.6041/j.issn.1000-1298.2018.10.048
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
26. Plant Point Cloud Information Fusion Method Based on SICK and Kinect Sensors
Accession number: 20185206314777
Authors: Liu, Hui (1); Pan, Chengkai (1); Shen, Yue (1); Gao, Bin (1)
Author affiliation: (1) School of Electrical and Information Engineering, Jiangsu University, Zhenjiang; 212013, China
Corresponding author: Shen, Yue(shen@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 284-291
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at solving the location restrict of sensor and complicated calibration problem of traditional point cloud fusion and the problem of missing edges in Kinect outdoor work, a method of plant point cloud information fusion based on SICK and Kinect was put forward. The 3D accurate reconstruction of data acquired by 2D laser sensor, SICK LMS151, needed the cooperation of real speed sensor. Due to the short time of obtaining per frame data of SICK and low speed, X-axis data for each column was set the same and the distance between two columns was calculated according to the real speed and sensor working frequency. Original color point clouds of plant were merged by color images and depth images obtained by Kinect. Firstly, preprocessing was carried out to extract point cloud of plant from original point clouds, in which lots of point clouds of background and noise were involved. In order to minimize the amount of points and keep enough characteristics, voxel grid was executed to down sample the plant point cloud. Secondly, normal calculation was executed on each point of plant point cloud to compute feather information by making use of depth features and peripheral point, fast point feature histograms (FPFH) was performed to enrich the feather information, which contained 33 dimensions element for each point. Thirdly, sample consensus-initial alignment (SAC-IA) algorithm, an initial registration algorithm, was applied to register SICK laser point cloud and Kinect point cloud to provide a better spatial mapping relationship for accurate registration. Fourthly, on the basis of initial registration, the iterative closest point (ICP) algorithm was used to refine the initial transform matrix inferred by initial registration. Finally, the information fusion was adopted by ANN algorithm to find corresponding point in Kinect color point cloud from SICK point cloud. However, Kinect point cloud would lose lots of edge information when working under the sun, resulting in the fusion faults. Overlimit compensation would work, when ANN cannot find the corresponding point or the distance between corresponding point and searching point was beyond threshold, the searching point would be considered as corresponding point and found the color information by corresponding function provided by Kinect SDK. Experiments showed that the fusion method can effectively and accurately realize the information fusion between different point clouds and suppress the interference of the sun. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Iterative methods
Controlled terms: Color? - ?Information fusion
Uncontrolled terms: 3D point cloud? - ?Accurate registration? - ?Information fusion method? - ?Iterative closest point algorithm? - ?Kinect? - ?Plant? - ?Registration? - ?Registration algorithms
Classification code: 741.1 Light/Optics
Light/Optics
? - ?903.1 Information Sources and Analysis
Information Sources and Analysis
? - ?921.6 Numerical Methods
Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2018.10.032
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
27. Experiment on Nitrogen Utilization of Maize under Different Water and Fertilizer Conditions Based on 15N Tracing Technique
Accession number: 20185206314778
Authors: Zhang, Zhongxue (1, 2); Shang, Wenbin (1, 2); Zheng, Ennan (1, 2); Chen, Shuaihong (1, 2); Chen, Peng (1, 2); Liu, Ming (1, 2)
Author affiliation: (1) School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin; 150030, China; (2) Key Laboratory of High Efficiency Utilization of Agricultural Water Resources, Ministry of Agriculture, Harbin; 150030, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 292-299 and 346
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The aim was to study absorption and utilization of nitrogen fertilizer of maize under different water and fertilizer conditions by using the 15N tracer technique. Three irrigation levels (200 m3/hm2, 400 m3/hm2 and 600 m3/hm2) and five nitrogen application levels (0 kg/hm2, 150 kg/hm2, 200 kg/hm2, 250 kg/hm2 and 300 kg/hm2) were set. The absorption of nitrogen from fertilizer and soil in different organs of maize was studied at maturation stage. Soil nitrogen excitation effect and nitrogen fertilizer efficiency under different water and fertilizer conditions were also studied. The results showed that the nitrogen absorbed from fertilizer by maize accounted for 33.32%~43.54% and the nitrogen absorbed from soil by maize accounted for 56.46%~66.68% under different water and fertilizer conditions. It was showed that soil was the main nitrogen source of maize growth. The different organs’ competitive ability to nitrogen from fertilizer was different, and the expression in a descending trend was grain, leaf and stem. Increasing of nitrogen application could improve the absorption ability of maize to nitrogen from soil, but it was necessary to increase the amount of water when excessive nitrogen was applied, in order to make the maize absorb more nitrogen from soil. The 15N residue in 0~60 cm soil layer was increased with the increase of nitrogen application rate. With the increase of irrigation volume, the residual amount of 15N on the surface was decreased. When the amount of irrigation was 400 m3/hm2 and nitrogen applied was 250 kg/hm2, the yield reached 14 063.04 kg/hm2, and the soil nitrogen reservoir was in equilibrium state which not only achieved high production, but also met the needs of environment friendly. The conclusion can provide reference for the management of corn fertilizer and water and the sustainable development of agriculture. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Nitrogen fertilizers
Controlled terms: Irrigation? - ?Reservoirs (water)? - ?Soils? - ?Sustainable development? - ?Water absorption
Uncontrolled terms: Absorption abilities? - ?Environment friendly? - ?Fertilizer efficiency? - ?Isotope-tracer techniques? - ?Maize? - ?Nitrogen application rates? - ?Nitrogen uptake? - ?Nitrogen utilization
Classification code: 441.2 Reservoirs
Reservoirs
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?802.3 Chemical Operations
Chemical Operations
? - ?804 Chemical Products Generally
Chemical Products Generally
? - ?821.3 Agricultural Methods
Agricultural Methods
Numerical data indexing: Size 0.00e+00m to 6.00e-01m
DOI: 10.6041/j.issn.1000-1298.2018.10.033
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
28. Extraction Methods of Cotton Coverage Based on Lab Color Space
Accession number: 20185206314772
Authors: Niu, Yaxiao (1, 2); Zhang, Liyuan (1, 2); Han, Wenting (1, 3)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Key Laboratory of Agriculture Internet of Things, Ministry of Agriculture, Yangling; Shaanxi; 712100, China; (3) Institute of Soil and Water Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Han, Wenting(hanwt2000@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 240-249
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The extraction method of cotton coverage was studied based on the difference of vegetation and non-vegetation pixels of RGB images from hand-held camera and unmanned aerial vehicle (UAV) remote sensing in different color spaces. Under different lighting conditions, totally 29 high-resolution (0.4mm) RGB images of cotton in seedling and bud stage were obtained by hand-held digital camera. The recognition abilities of cotton in Lab (a), RGB (2G-R-B) and HIS (H) color spaces were compared and analyzed. Two threshold classification threshold getting methods, dynamic threshold and fixed threshold were used to extract cotton coverage. The dynamic thresholds were determined by the intersection of the Gaussian distributions of vegetation and non-vegetation pixels. The fixed thresholds were set as the mean values of dynamic thresholds in the three color spaces, respectively. The results showed that vegetation and non-vegetation pixels obeyed Gaussian distribution in a, 2G-R-B, and H color spaces, which could be fitted by using nonlinear least-squares algorithm. The distribution range of dynamic classification thresholds was relatively concentrated, and their mean values of -3.78, 0.06 and 0.13 could be set as fixed classification thresholds. Compared with 2G-R-B and H, the a color space had the best ability to identify green vegetation and was more suitable for extracting cotton vegetation coverage. Compared with dynamic threshold, the extraction accuracy based on fixed threshold was better and the average extraction error was 0.009 4. It can also accurately extract fractional vegetation cover (FVC) from UAV images captured under different light conditions (sunny and cloudy) with different soil moistures. After preliminary tests and analysis, it was believed that based on the differences of vegetation and non-vegetation pixels in Lab (a) color space, combining with a fixed classification threshold of -3.78, cotton coverage in seedling and bud stage could be accurately extracted under different light conditions. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Color
Controlled terms: Antennas? - ?Cotton? - ?Extraction? - ?Gaussian distribution? - ?Image processing? - ?Laboratories? - ?Pixels? - ?Remote sensing? - ?Soil moisture? - ?Unmanned aerial vehicles (UAV) ? - ?Vegetation
Uncontrolled terms: Color space? - ?Dynamic classification? - ?Extraction accuracy? - ?Fractional vegetation cover? - ?Lighting conditions? - ?Non-linear least squares algorithms? - ?Recognition abilities? - ?Vegetation coverage
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?652.1 Aircraft, General
Aircraft, General
? - ?741.1 Light/Optics
Light/Optics
? - ?802.3 Chemical Operations
Chemical Operations
? - ?821.4 Agricultural Products
Agricultural Products
? - ?922.1 Probability Theory
Probability Theory
Numerical data indexing: Size 4.00e-04m
DOI: 10.6041/j.issn.1000-1298.2018.10.027
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
29. Design of Dynamic Bionic Stubble Cutting Device and Optimization Test of Parameters
Accession number: 20185206314757
Authors: Jia, Honglei (1, 2); Guo, Mingzhuo (1, 2); Guo, Chunjiang (1, 2); Zheng, Jian (1, 2); Zhang, Chengliang (3); Zhao, Jiale (1, 2)
Author affiliation: (1) Key Laboratory of Bionics Engineering, Ministry of Education, Jilin University, Changchun; 130025, China; (2) College of Biological and Agricultural Engineering, Jilin University, Changchun; 130025, China; (3) Harbin Academy of Agricultural Science, Harbin; 150028, China
Corresponding author: Zhao, Jiale(zhaojiale0103@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 103-114
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Corn stalks are stout and non-perishable in Northeast China, which results in the low cutting-out rate and high working resistance torque of the no-tillage planter. To improve the cutting efficiency of corn stalks and stubbles, a dynamic bionic stubble cutting device was designed, which was based on both the multistep serrated mouthpart structure and the moving mode of different-direction isokinetic occlusion. The planetary gear mechanism and bionic cutting disc were designed through bionic construction, mechanism design, theoretical analysis and parameter optimization; the intelligent driving system was designed by using Arduino system and intelligent control method, and thus the coupling bionic of motion mode and structure was realized. Moreover, the effect of structure and operating parameters, including the number of blades, radius of gyration and forward speed,on the cutting efficiency and working torque was studied via optimization test and regression analysis. The simulation tests results showed that the dynamic bionic stubble cutting device achieved the optimal working efficiency when the machine speed was 10 km/h, the radius of gyration was 250 mm, the number of bionic locust mouthpart blade in positive rotation cutting disc was 9, and the number of bionic locust mouthpart blade in reverse rotation cutting disc was 18. The comparative tests showed that for the dynamic bionic stubble cutting device, the cutting rate of corn stalks and stubbles were decreased with the increase of machine speed. The cutting-out rate was the highest with a value of 97.1% when the machine speed was 6 km/h, while it was the lowest with a value of 92.9% when the machine speed was 10 km/h. Compared with the passive notch disc and the driving notch disc, the cutting-out rate of the dynamic bionic stubble cutting device was increased by 22.6%~27.4% and 8.6%~13.5%, respectively. Besides, the cutting torque of dynamic bionic stubble cutting device was decreased with the increase of the machine speed. When the machine speed was 6 km/h, the cutting torque was the largest with value of 60.5 N?m. Whereas the cutting torque reached the minimum at the machine speed of 10 km/h with value of 54.1 N?m. The cutting torque of dynamic bionic stubble cutting device was reduced by 19.5%~21.8% compared with the driving notch disc. After the operation, the average surface roughness and the maximum wear scar depth were decreased by 14.5% and 15.9%, respectively, compared with that of the driving notch disc. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Gear cutting
Controlled terms: Agriculture? - ?Bionics? - ?Couplings? - ?Efficiency? - ?Machine design? - ?Motion control? - ?Regression analysis? - ?Rotation? - ?Speed? - ?Surface roughness ? - ?Testing? - ?Torque
Uncontrolled terms: Anti-blocking device? - ?Average surface roughness? - ?Intelligent driving systems? - ?No-tillage planter? - ?Orthogonal test? - ?Parameter optimization? - ?Planetary gear mechanism? - ?Stubble device
Classification code: 461.1 Biomedical Engineering
Biomedical Engineering
? - ?601 Mechanical Design
Mechanical Design
? - ?604.1 Metal Cutting
Metal Cutting
? - ?731.3 Specific Variables Control
Specific Variables Control
? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
? - ?913.1 Production Engineering
Production Engineering
? - ?922.2 Mathematical Statistics
Mathematical Statistics
? - ?931.1 Mechanics
Mechanics
? - ?931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
Numerical data indexing: Percentage 1.45e+01%, Percentage 1.59e+01%, Percentage 9.29e+01%, Percentage 9.71e+01%, Size 2.50e-01m, Torque 5.41e+01N*m, Torque 6.05e+01N*m, Velocity 1.67e+00m/s, Velocity 2.78e+00m/s
DOI: 10.6041/j.issn.1000-1298.2018.10.012
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
30. Location Information Collection and Optimization for Agricultural Vehicle Based on UWB
Accession number: 20185206314748
Authors: Lin, Xiangze (1); Wang, Xiang (1); Lin, Caixin (1); Geng, Jing (1); Xue, Jinlin (1); Zheng, Enlai (1)
Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 23-29 and 45
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: An ultra wide band indoor positioning platform was developed to improve the positioning accuracy of agricultural vehicle in a greenhouse environment. Firstly, based on Ubisense radio frequency chip, a positioning platform tag and a base station were designed. The position data were obtained by location ranging method named time difference of arrival (TDOA). Then, in order to get accurate positioning information and meet the needs of precise positioning for agricultural vehicle in greenhouse, K-means clustering and segmentation processing method were applied for the optimization calculation of static and dynamic positioning data respectively. In this procedure, the measurement errors, which were caused by propagation characteristics of pulse signal and the single ranging method, were decreased. Finally, static and dynamic positioning tests were conducted under the greenhouse environment respectively. The experimental results showed that the optimized static positioning accuracy was 0.063 4 m. Meanwhile, the probability of the dynamic positioning accuracy, which was no more than 8 cm gotten by virtue of the dynamic precision positioning algorithm can be increased by 3.7 times than that of the original Ubisense positioning platform. Hence, the platform built can meet the practical application requirements. The research provided a reference for the positioning, navigation and intelligent refinement operation of agricultural vehicle in the greenhouse. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 36
Main heading: Vehicles
Controlled terms: Agriculture? - ?Dynamic positioning? - ?Greenhouses? - ?Optimization? - ?Time difference of arrival? - ?Ultra-wideband (UWB)
Uncontrolled terms: Application requirements? - ?Greenhouse environment? - ?K-means? - ?Optimization calculation? - ?Positioning information? - ?Precise positioning? - ?Propagation characteristics? - ?Segmentation processing
Classification code: 716.3 Radio Systems and Equipment
Radio Systems and Equipment
? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
? - ?821.6 Farm Buildings and Other Structures
Farm Buildings and Other Structures
? - ?921.5 Optimization Techniques
Optimization Techniques
Numerical data indexing: Size 8.00e-02m
DOI: 10.6041/j.issn.1000-1298.2018.10.003
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
31. Investigation on Photosynthetic Parameters of Cotton during Budding Period by Multi-spectral Remote Sensing of Unmanned Aerial Vehicle
Accession number: 20185206314771
Authors: Chen, Junying (1, 2); Chen, Shuobo (1, 2); Zhang, Zhitao (1, 2); Fu, Qiuping (3); Bian, Jiang (1); Cui, Ting (1)
Author affiliation: (1) Key Laboratory of Agricultural Soil and Water Engineering, 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 Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi; 830052, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 230-239
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Photosynthesis plays a vital role in crop growth, dry mater accumulation and yield formation. How to monitor it quickly and widely is still a problem so far. Taking the unmanned aerial vehicle (UAV) as the remote sensing platform, and a multispectral camera with six bands was mounted. To explore the feasibility of retrieving crop canopy photosynthetic parameters by using remote sensing technology, the cotton in budding period were studied. The camera was used to capture the image of cotton canopy at different times in one day (09:00, 11:00, 13:00, 15:00 and 17:00),of which the reflectance information was extracted. The parameters of cotton photosynthetic (net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular carbon dioxide concentration (Ci) and transpiration rate (Tr)) were measured at the moment when the UAV was landed. Through the correlation analysis of the four photosynthetic parameters and the six-band reflectance, the retrieving model of different photosynthetic parameters at different times was established by univariate linear regression, principal component regression (PCR), ridge regression (RR) and partial least-squares regression (PLSR), respectively. The results showed that the best retrieving models of net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and intercellular carbon dioxide concentration (Ci) were the univariate linear model based on the reflectance of the blue light band at 13:00, the univariate linear model based on the reflectance of the red light band at 15:00, the ridge regression model at 15:00 and the univariate linear model based on the red light band at 15:00,respectively. The decision coefficients(R2) of the models were more than 0.5, and the relative errors(RE) were less than 9%. The research result can provide a certain reference for monitoring the photosynthesis of crops in a large scale. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Aerial photography
Controlled terms: Antennas? - ?Cameras? - ?Carbon dioxide? - ?Cotton? - ?Crops? - ?Least squares approximations? - ?Photosynthesis? - ?Principal component analysis? - ?Reflection? - ?Regression analysis ? - ?Remote sensing? - ?Transpiration? - ?Unmanned aerial vehicles (UAV)
Uncontrolled terms: Budding period? - ?Carbon dioxide concentrations? - ?Multiple regressions? - ?Multispectral remote sensing? - ?Partial least squares regressions (PLSR)? - ?Photosynthetic parameters? - ?Principal component regression? - ?Remote sensing technology
Classification code: 461.9 Biology
Biology
? - ?652.1 Aircraft, General
Aircraft, General
? - ?741.1 Light/Optics
Light/Optics
? - ?742.1 Photography
Photography
? - ?742.2 Photographic Equipment
Photographic Equipment
? - ?804.2 Inorganic Compounds
Inorganic Compounds
? - ?821.4 Agricultural Products
Agricultural Products
? - ?921.6 Numerical Methods
Numerical Methods
? - ?922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 9.00e+00%
DOI: 10.6041/j.issn.1000-1298.2018.10.026
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
32. Empirical Model for Predicting Wetted Soil Dimensions under Vertical Line Source Irrigation
Accession number: 20185206314783
Authors: Fan, Yanwei (1); Shao, Xiaoxia (1); Wang, Ying (2); Gong, Jiaguo (2)
Author affiliation: (1) College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; (2) State Key Laboratory of Simulation and Regulation of Water Cycles in River Basins, China Institute of Water Resources and Hydropower Research, Beijing; 100038, China
Corresponding author: Gong, Jiaguo(jiaguogong@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 336-346
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The wetting pattern is difficult to observe during the vertical line source irrigation. Knowledge of the dimensions of wetted soil around the emitter under irrigation is essential to design of cost-effective and efficient vertical line source irrigation systems. Based on the HYDRUS-2D model, a mathematical model of soil water movement in vertical line source irrigation was established. And 81 scenarios were set up to simulate the changing process of wetted soil under different soil textures, initial water content, line source length, diameter and depth conditions. The dimensions of wetted soil were mainly affected by soil texture, the thicker the soil texture was, the faster the wetted front was moved, and the length, diameter and buried depth of line source had little influence on it. The migration process of soil wetting front was in accordance with the power function relationship. The power function index was changed little in the horizontal and vertical upward directions, but it was increased with the saturated hydraulic conductivity (Ks) in the vertical downward direction. The power function coefficient was increased with the increase of Ks. An empirical model for predicting the wetted soil dimensions under vertical line source irrigation containing Ks was proposed, the model reliability was verified by using experimental data. MAE and RMSE were close to 0, PBIAS was between -4% and 9%, and NSE was not less than 0.929, indicating that the prediction effect was good. The model can be estimated only by Ks, and the experimental design was simple. The possibility of predicting the soil wetting front migration distance under vertical line source irrigation by soil physical parameters was initially realized. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 62
Main heading: Wetting
Controlled terms: Cost effectiveness? - ?Forecasting? - ?Hydraulic conductivity? - ?Irrigation? - ?Soil moisture
Uncontrolled terms: Empirical model? - ?HYDRUS-2D? - ?Initial water contents? - ?Saturated hydraulic conductivity? - ?Soil physical parameters? - ?Soil water movement? - ?Vertical line source? - ?Wetted soil dimension
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?632.1 Hydraulics
Hydraulics
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?911.2 Industrial Economics
Industrial Economics
Numerical data indexing: Percentage -4.00e+00% to 9.00e+00%
DOI: 10.6041/j.issn.1000-1298.2018.10.038
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
33. Rice Planting Area Extraction Based on Multi-source Data Fusion
Accession number: 20185206314779
Authors: Wei, Yongxia (1, 2); Yang, Junming (1); Wu, Yu (3, 4); Wang, Bin (1); Shehakk, M. (1); Hou, Jingxiang (1)
Author affiliation: (1) School of Water Conservancy and Architecture, Northeast Agricultural University, Harbin; 150030, China; (2) Key Laboratory of High Efficiency Utilization of Agricultural Water Resources, Ministry of Agriculture, Harbin; 150030, China; (3) College of Forestry, Northeast Forestry University, Harbin; 150040, China; (4) Heilongjiang Agricultural Reclamation Survey and Research Institute, Harbin; 150090, China
Corresponding author: Wang, Bin(wangbin@neau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 300-306
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The absence of medium and high spatial resolution image data is the main limiting factor for extraction of spatial distribution of crops with high spatial resolution. A multi-source remote sensing vegetation index data fusion model based on fuzzy C-clustering algorithm was proposed to solve the problem of no satellite image data coverage in the critical growth period of crop extraction, and it was used to generate vegetation index data with high temporal and spatial resolution by combining Landsat with MODIS vegetation index data. Standard series EVI curve was obtained by ground sample, and the fuzzy C-clustering algorithm was used to classify the vegetation index data generated by the data fusion model into several classes, and series EVI curve of each classes was obtained by using the average value of each class as the class value. The spatial distribution of rice was extracted by spectral correlation similarity analysis of standard series EVI curve and class series curve. Accuracy of the method was tested by Google Earth image and ground sample, and the accuracy were 0.92 and 0.94, respectively, thus it was thought that the method can get relatively high accuracy. The method can be applied to extract the spatial distribution information of crops that had high spatial resolution in the areas of lacking high resolution remote sensing image data. And the multi-source remote sensing vegetation index data fusion models can be used to generate vegetation index data with high spatial and temporal resolution. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Clustering algorithms
Controlled terms: C (programming language)? - ?Crops? - ?Data fusion? - ?Data mining? - ?Extraction? - ?Image processing? - ?Image resolution? - ?Remote sensing? - ?Spatial distribution? - ?Vegetation
Uncontrolled terms: High resolution remote sensing images? - ?High spatial resolution? - ?High spatial resolution images? - ?MODIS vegetation indices? - ?Rice? - ?Satellite image datas? - ?Spatial and temporal resolutions? - ?Spectral matching techniques
Classification code: 723.1.1 Computer Programming Languages
Computer Programming Languages
? - ?723.2 Data Processing and Image Processing
Data Processing and Image Processing
? - ?802.3 Chemical Operations
Chemical Operations
? - ?821.4 Agricultural Products
Agricultural Products
? - ?903.1 Information Sources and Analysis
Information Sources and Analysis
? - ?921 Mathematics
Mathematics
DOI: 10.6041/j.issn.1000-1298.2018.10.034
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
34. Predictive Control of Greenhouse Temperature Hybrid System Based on Crop Temperature Integration Theory
Accession number: 20185206314784
Authors: Qin, Linlin (1); Ma, Jiao (1); Huang, Yunmeng (1); Wu, Gang (1)
Author affiliation: (1) School of Information Science and Technology, University of Science and Technology of China, Hefei; 230027, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 347-355
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Greenhouse temperature system is a typical hybrid system, and its inputs include discrete equipment control quantities and a number of outdoor environmental disturbances that can be measured and not controlled. A hybrid system was proposed for greenhouse temperature, a switching system model was established, and a multi-input predictive control was designed based on this model. A determined device state can be considered as a subsystem, and the modeling of the greenhouse system can also be transformed into the modeling of all subsystems. There were numerous greenhouse environments, so it was needed to simplify the input variables. By correlation analysis, outside temperature, outside humidity and solar radiation had obviously strong correlation with inside temperature. The ARMAX model was used to describe the model, and the augmented recursive least square method with forgetting factor was used to identify the model parameters, and the model accuracy was verified. The ARMAX model was used to design a predictive control controller to solve each device’s action sequence, which was an NP-hard problem, and it was solved by optimized pruning simplifies the calculation process. At each sampling time, the set value predictive control was determined, however, under uncontrollable external environmental factors, the output fluctuations were large. If a fixed set-point was used, the system would be switched frequently, and thus increasing equipment loss. In order to solve this problem, the dual-period accumulative temperature method was utilized to dynamically adjust the set-point of predictive control according to the long-period average value of the indoor temperature and the current value, so as to reduce the unnecessary switching of the equipment and reduce the loss. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Model predictive control
Controlled terms: Computational complexity? - ?Controllers? - ?Greenhouses? - ?Hybrid systems? - ?Least squares approximations? - ?Optimization? - ?Problem solving? - ?Temperature
Uncontrolled terms: Environmental disturbances? - ?Environmental factors? - ?Greenhouse environment? - ?Greenhouse temperature? - ?Optimized pruning? - ?Recursive least square methods? - ?Switched system? - ?Temperature integration
Classification code: 641.1 Thermodynamics
Thermodynamics
? - ?721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
? - ?732.1 Control Equipment
Control Equipment
? - ?821.6 Farm Buildings and Other Structures
Farm Buildings and Other Structures
? - ?921 Mathematics
Mathematics
DOI: 10.6041/j.issn.1000-1298.2018.10.039
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
35. Diagnosis of Cotton Water Stress Using Unmanned Aerial Vehicle Thermal Infrared Remote Sensing after Removing Soil Background
Accession number: 20185206314773
Authors: Zhang, Zhitao (1, 2); Bian, Jiang (1, 2); Han, Wenting (2); Fu, Qiuping (3); Chen, Shuobo (1, 2); Cui, Ting (1, 2)
Author affiliation: (1) Key Laboratory of Agricultural Soil and Water Engineering, 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 Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi; 830052, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 250-260
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With the rapid development of remote sensing platform of low altitude unmanned aerial vehicle (UAV), the dynamic, fast and inexpensive features, the UAV remote sensing platform has more research in various fields, especially in the precision agriculture irrigation technology. The unmanned aerial vehicle thermal infrared low altitude remote sensing technology can quickly monitor the canopy temperature information of the crop, which can further use the canopy temperature information to diagnose the water stress condition of the crop. However, the processing of high resolution thermal infrared image of UAV is the key to the diagnosis of crop moisture, eliminating the soil background of UAV thermal infrared image is an effective way to improve the accuracy of crop water diagnosis. However, it is also a difficult problem in thermal infrared image processing. Different water treatments were carried out, including I1 (50% of field holding water), I2 (65% of field holding water), I3 (80% of field holding water) and I4 (control group 95%~100% of field holding water), and each water treatment set three repeat tests, a total of 12 plots, each plot was 4 m×5 m). Flower boll cotton was taken as study object at 09:00, 13:00 and 17:00 of day, respectively, and UAV high resolution thermal infrared images were obtained. Firstly, the two-valued Ostu algorithm and the Canny edge detection algorithm were used to deal with the thermal infrared image, and achieve the elimination of soil background, then, the two-valued Ostu algorithm and Canny edge detection algorithm contained soil background were used to calculate the crop water stress index, finally, the relationship models between three kinds of crop water stress index (CWSI) and cotton leaf stomatal conductance at different times was established. The researchresults showed that the application of Canny edge detection algorithm can effectively eliminate the soil background in thermal infrared image, and there was a single peak distribution of the temperature histogram after removing the soil background. Among the crop water stress index obtained from three kinds of treatment methods, the CWSI of Canny edge detection algorithm was the minimal, the CWSI of two-valued Ostu algorithm was higher, and the CWSI with soil background was the largest. The determination coefficient between CWSI and cotton leaf stomatal conductance by using Canny edge detection algorithm to remove the soil background was up to 0.84, and that by using two-valued Ostu algorithm resulted the second, and that got by containing soil background was the worst. The research result can provide a reference method for monitoring water condition of the plant by UAV thermal infrared technology. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 36
Main heading: Edge detection
Controlled terms: Aircraft detection? - ?Antennas? - ?Cotton? - ?Crops? - ?Image enhancement? - ?Infrared imaging? - ?Infrared radiation? - ?Plants (botany)? - ?Remote sensing? - ?Signal detection ? - ?Soils? - ?Unmanned aerial vehicles (UAV)? - ?Water treatment
Uncontrolled terms: Canny edge detection? - ?Crop water stress indices? - ?Determination coefficients? - ?Leaf stomatal conductance? - ?Remote sensing technology? - ?Stomatal conductance? - ?Thermal infrared? - ?Thermal infrared remote sensing
Classification code: 445.1 Water Treatment Techniques
Water Treatment Techniques
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?652.1 Aircraft, General
Aircraft, General
? - ?716.1 Information Theory and Signal Processing
Information Theory and Signal Processing
? - ?716.2 Radar Systems and Equipment
Radar Systems and Equipment
? - ?741.1 Light/Optics
Light/Optics
? - ?746 Imaging Techniques
Imaging Techniques
? - ?821.4 Agricultural Products
Agricultural Products
Numerical data indexing: Percentage 5.00e+01%, Percentage 6.50e+01%, Percentage 8.00e+01%
DOI: 10.6041/j.issn.1000-1298.2018.10.028
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
36. Discrete Element Simulations and Experiments of Disturbance Behavior as Affected by Mounting Height of Subsoiler’s Wing
Accession number: 20185206314759
Authors: Wang, Xuezhen (1); Yue, Bin (1); Gao, Xijie (1); Zheng, Zhiqi (1, 2); Zhu, Ruixiang (1, 2); Huang, Yuxiang (1, 2)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Shaanxi Engineering Research Center for Agricultural Equipment, Yangling; Shaanxi; 712100, China
Corresponding author: Huang, Yuxiang(hyx@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 124-136
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The mounting height of the wing is one of the key structural parameters of the winged subsoiler, which greatly affects disturbance behavior of subsoiling. The disturbance behavior and resistance under different heights of the wing (55 mm, 75 mm, 95 mm, 115 mm and 135 mm) were compared and analyzed by the comprehensive use of EDEM and digitized soil-bin test. The results showed that with the increase of mounting height of the wing (MHW), the disturbance area of hardpan layer after subsoiling was increased first and then decreased, and it reached the maximum when MHW was 75 mm; moreover, the horizontal tillage resistance was decreased gradually with the increase of MHW, and the horizontal tillage resistance of the share and arc section in the hardpan layer was the main source of horizontal tillage resistance of subsoiler (more than 90%), which was also decreased gradually with the increase of MHW; MHW directly affected the displacement of different directions of soil at different depths during tillage. When MHW was 75 mm, the maximum displacement in the working direction of soil of each layer in the longitudinal center of the subsoiler was relatively small, the maximum displacement in the vertical direction of the soil in hardpan layer was relatively large, and the maximum displacement in the vertical direction of the top soil and the soil of tillage layer was relatively small; and a proper mounting height of the wing was of great importance to disturbance effectiveness, and the discrete element simulation could accurately simulate the disturbance behavior of subsoiling. The average errors of five mounting heights of the wing of soil bulkiness, soil disturbance coefficient, soil fragmentation parameter and longitudinal accumulation angle of surface soil between simulation and experiment were 11.69%, 11.54%, 14.20% and 9.64%, respectively. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 35
Main heading: Soils
Controlled terms: Agriculture? - ?Experiments? - ?Finite difference method? - ?Mountings? - ?Wings
Uncontrolled terms: Average errors? - ?Different heights? - ?Discrete element simulation? - ?Maximum displacement? - ?Soil disturbances? - ?Structural parameter? - ?Subsoiler? - ?Vertical direction
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?601.2 Machine Components
Machine Components
? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
? - ?901.3 Engineering Research
Engineering Research
? - ?921.6 Numerical Methods
Numerical Methods
Numerical data indexing: Percentage 1.15e+01%, Percentage 1.17e+01%, Percentage 1.42e+01%, Percentage 9.00e+01%, Percentage 9.64e+00%, Size 1.15e-01m, Size 1.35e-01m, Size 5.50e-02m, Size 7.50e-02m, Size 9.50e-02m
DOI: 10.6041/j.issn.1000-1298.2018.10.014
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
37. Influence of Volute Retrofit Design on Performance of Multi-blade Centrifugal Fan
Accession number: 20185206314765
Authors: Zhou, Shuiqing (1); Wang, Man (1); Li, Zheyu (1); Zhang, Shengchang (1)
Author affiliation: (1) College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou; 310024, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 180-186 and 249
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the phenomenon of increased flow separation caused by the influence of gas viscosity on the small multi-blade centrifugal fan, the influence of gas viscous torque on volute wall distribution was studied based on the traditional volute design theory, and the momentum correction was used to modify the design. In addition, in order to truly reflect the distribution of the flow field in the fan, the viscous stress was added to the diffusion term of standard k-Ε calculation model to reduce the maximum calculation error to 3%. Comparing and analyzing the fan’s numerical simulation and experimental results before and after modification, the modified k-Ε model was used to calculate, and it was found that the vortex intensity in the modified fan was reduced, and the flow separation near the volute outlet at the volute outlet was improved. The experimental results showed that the static pressure at the outlet of the modified fan was increased by about 25 Pa, and the maximum full-pressure efficiency was improved by about 10% compared with the prototype. At the same time, due to the expansion of the volute expansion, flow separation can be suppressed, the vortex intensity in the vicinity of the volute tongue and its influence area were reduced, and the noise of the multi-blade centrifugal fan was effectively reduced by 2.5 dB. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Flow separation
Controlled terms: Expansion? - ?Fans? - ?Noise abatement? - ?Optimization? - ?Vortex flow
Uncontrolled terms: Calculation error? - ?Calculation models? - ?Centrifugal fans? - ?K epsilon models? - ?Model corrections? - ?Standard k epsilons? - ?Volute profile? - ?Vortex intensity
Classification code: 618.3 Blowers and Fans
Blowers and Fans
? - ?631 Fluid Flow
Fluid Flow
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?751.4 Acoustic Noise
Acoustic Noise
? - ?921.5 Optimization Techniques
Optimization Techniques
? - ?951 Materials Science
Materials Science
Numerical data indexing: Decibel 2.50e+00dB, Percentage 1.00e+01%, Percentage 3.00e+00%, Pressure 2.50e+01Pa
DOI: 10.6041/j.issn.1000-1298.2018.10.020
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
38. Responses of Landsat-based NDVI to Interaction of Vegetation and Influencing Factors
Accession number: 20185206314769
Authors: Lin, Yuying (1); Hu, Xisheng (1); Qiu, Rongzu (1); Zhang, Zhengxiong (1); Lin, Qiao (1); Lin, Jinguo (2)
Author affiliation: (1) College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou; 350002, China; (2) College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou; 350002, China
Corresponding author: Lin, Jinguo(fjlinjg@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 212-219
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Vegetation is the most important ecosystem in the earth, which plays an important regulatory role in global climate change. Research on the temporal and spatial dynamic changes of vegetation has important scientific and practical value. Based on the normalized difference vegetation index (NDVI) of Landsat satellite remote sensing imagery extracted in 2007, 2012 and 2016 and the forest inventory data of Sanming City, the spatio-temporal changes of NDVI of Minjiang River upstream area in the last 10 years and the influencing factors were studied. The results showed that the NDVI values of the study area in 2007, 2012 and 2016 were increased gradually, and their values were 0.72, 0.75 and 0.79, respectively, which indicated that the coverage of vegetation was high, and the overall ecological quality was good. The lower NDVI values were located in the urban area, the concentration points of the township residents and near the road network. The NDVI values of different vegetation types were in a descending trend as broadleaf forest, shrub forest, Masson pine forest, bamboo forest, Chinese fir forest, miscellaneous wood forest, eucalyptus forest, other wooded land, economic forest, eucalyptus forest and non-forest land. NDVI index value was gradually increased with the increase of forest age, canopy closure and slope, while it was decreased with the increase of grade of the site quality. According to variation of changing dynamics of NDVI index with age of different types of vegetation, and the vegetation was divided into the following three types: type of steadily rising, such as broad-leaved forest and Pinus massoniana forest; type of rising fast at early stage and slow at late stage, such as eucalyptus forest; type of rising first and then fall, such as Chinese fir forest and other woodland. The NDVI value of Pinus massoniana forest was increased with the increase of slope, while the NDVI value of other forest vegetation types was risen first and then decreased with the increase of slope, and reached the highest value at the slope of 30°~40°. The NDVI index values of different vegetation types had different responses to canopy closure. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Forestry
Controlled terms: Climate change? - ?Earth (planet)? - ?Ecology? - ?Remote sensing? - ?Satellite imagery? - ?Vegetation
Uncontrolled terms: Forest inventory data? - ?Global climate changes? - ?LANDSAT? - ?Minjiang River? - ?Normalized difference vegetation index? - ?Spatio-temporal changes? - ?Temporal and spatial dynamics? - ?Vegetation cover
Classification code: 443.1 Atmospheric Properties
Atmospheric Properties
? - ?454.3 Ecology and Ecosystems
Ecology and Ecosystems
? - ?655.2 Satellites
Satellites
Numerical data indexing: Age 1.00e+01yr
DOI: 10.6041/j.issn.1000-1298.2018.10.024
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
39. RGB-D Visual SLAM Algorithm for Mobile Robots
Accession number: 20185206314750
Authors: Chen, Shao (1, 2); Guo, Yuxiang (1, 2); Gao, Tianxiao (1, 2); Gong, Qingyuan (1, 2); Zhang, Junguo (1, 2)
Author affiliation: (1) School of Technology, Beijing Forestry University, Beijing; 100083, China; (2) Key Laboratory of National Forestry and Grassland Administration for Forestry Equipment and Automation, Beijing; 100083, China
Corresponding author: Zhang, Junguo(zhangjunguo@bjfu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 38-45
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In view of the problems of low accuracy and poor real-time in the research of visual simultaneous localization and mapping, a RGB-D vision SLAM algorithm for indoor mobile robots was proposed. Firstly, feature points of RGB image were extracted by using oriented fast and rotated brief (ORB) algorithm, and matching point pair set was obtained by the bidirectional K-nearest neighbor (KNN) feature matching method based on fast library for approximate nearest neighbors (FLANN). The improved random sampling consistency algorithm (RE-RANSAC) was used to eliminate false matching points and estimate the 6D motion transformation model between two adjacent images, as the initial transformation model of GICP algorithm. The generalized iterative closest point algorithm (GICP) was used to obtain the optimized motion transformation model, and then the pose diagram was obtained. In order to improve the positioning accuracy, a random closed-loop detection link was introduced to reduce the cumulative error in the robot positioning process, and the pose diagram was optimized by using the general graph optimization (G2O) method to obtain the global optimal pose diagram and camera motion trajectory, and the global color dense point cloud map was finally generated. For the tested FR1 data sets, the minimum positioning error of the algorithm was 0.011 m, the average positioning error was 0.024 5 m, and the average processing time of each frame was 0.032 s, which can meet the requirement of rapid positioning and mapping of mobile robots. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Iterative methods
Controlled terms: Errors? - ?Image enhancement? - ?Indoor positioning systems? - ?Mapping? - ?Mobile robots? - ?Nearest neighbor search? - ?Robotics
Uncontrolled terms: Average positioning error? - ?Closed-loop detections? - ?Feature matching methods? - ?Iterative closest point algorithm? - ?Iterative Closest Points? - ?K nearest neighbor (KNN)? - ?Oriented fast and rotated brief (ORB)? - ?Visual simultaneous localization and mappings
Classification code: 405.3 Surveying
Surveying
? - ?731.5 Robotics
Robotics
? - ?921.5 Optimization Techniques
Optimization Techniques
? - ?921.6 Numerical Methods
Numerical Methods
Numerical data indexing: Size 1.10e-02m, Time 3.20e-02s
DOI: 10.6041/j.issn.1000-1298.2018.10.005
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
40. AMPK Activity and Glycolysis of Postmortem Beef at Different Altitudes
Accession number: 20185206314787
Authors: Yang, Yayuan (1); Song, Rende (2); Han, Ling (1); Gao, Yongfang (1); Yu, Qunli (1); Ma, Junyi (3)
Author affiliation: (1) College of Food Science and Engineering, Gansu Agricultural University, Lanzhou; 730070, China; (2) Yushu Animal Husbandry and Veterinary Workstation, Yushu; 815000, China; (3) Qinghai Baide Investment Development Limited Company, Xining; 810008, China
Corresponding author: Han, Ling(hanl@gsau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 370-374 and 380
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With the aim to explore the effects of AMPK activity, AMPK mRNA expression (PRKAA1, PRKAA2) in beef during the post-mortem period were measured in Yushu yak (4 500 m above sea level), Gannan yak (3 000 m above sea level) and Simmental hybrid beef (1 500 m above sea level) changes in glycolysis and energy metabolism. The results showed that the AMPK activities was in a ascending trend as Simmental hybrids, Gannan yak and Yushu yak; the expression of PRKAA1 in Simmental hybrid was slightly lower than that in Gannan and Yushu; the expression of PRKAA2 in Simmental hybrid was significantly lower than that in Gannan and Yushu (P ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Beef
Controlled terms: Gene expression? - ?Metabolism? - ?Muscle? - ?Pathology? - ?pH? - ?Sea level
Uncontrolled terms: Altitudes? - ?AMPK? - ?Energy generations? - ?Energy metabolism? - ?Glucose content? - ?Glycolysis? - ?mRNA expression? - ?Muscle glycogens
Classification code: 461 Bioengineering and Biology
Bioengineering and Biology
? - ?471.1 Oceanography, General
Oceanography, General
? - ?801.1 Chemistry, General
Chemistry, General
? - ?822.3 Food Products
Food Products
Numerical data indexing: Size 1.50e+03m, Size 3.00e+03m, Size 4.50e+03m, Time 2.59e+05s to 6.05e+05s, Time 4.32e+04s to 6.05e+05s
DOI: 10.6041/j.issn.1000-1298.2018.10.042
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
41. Structural Optimization and Performance Test of Sand-Screen Combination Filter
Accession number: 20185206314780
Authors: Yang, Peiling (1); Zhou, Yang (1); Ren, Shumei (1); Ma, Zixuan (1)
Author affiliation: (1) College of Water Resources and Civil 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: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 307-316
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to get fully understanding of the interior flow field of a two-stage filtration system composed of sand filter and screen filter in irrigation system, the interior flow field was analyzed and offered optimization by building 3D model using Pro/Engineer, based on computational fluid dynamics (CFD) technique, numerical simulation and using RNG k-Ε model combined with porous media model. And the new integrated filter was made and the performance test it was done. As it was shown in the result, simulation results of the RNG k-Ε model were consistent with the experimental results. Therefore, the model can be used for flow field analysis and structural optimization. When the combined filter system was set with sand filtration material and screen mesh separately installed in different shells, it would cause huge water head loss due to the influence of pipes between sand filter and screen filter and shell of screen filter. And too much circulation and whirlpool of water inside the filter due to complexity of structure led to instability of flow field, which finally caused uneven distribution of velocity during filtering. In terms of the shortcoming of traditional combination filter system based on field flow analysis, a new type of integrated layout optimization incorporating the screen into the sand filter was proposed to improve the complexity of the layout. According to the field flow analysis, integrated filter’s water head loss was decreased by 38.5%, and interior field flow was more stable because the tank space was larger and the flow disturbance was smaller. And the flow velocity distribution was more uniform during filtering, so the utilization of the screen was more reasonable, and the screen life of the filter was extended. After the comparison of two performance tests, it was known that the new integrated filter can effectively reduce the loss of water head and it can run about 20 min more when the flow rate was decreased by 20% under the condition of sand water. It was showed that the new integrated filter’s hydraulic performance was better and the irrigation efficiency was improved. According to the research raised above, a kind of digital method was proposed to discuss the performance of the filter, which was used to research and design a kind of integrated filter, and finally the advantageous structure of the integrated filter was obtained, including the sand filter and the screen filter. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Computational fluid dynamics
Controlled terms: Computer simulation? - ?Flow fields? - ?Flow velocity? - ?Irrigation? - ?Numerical models? - ?Porous materials? - ?Sand? - ?Shape optimization? - ?Structural analysis? - ?Structural optimization ? - ?Water filtration
Uncontrolled terms: Distribution of velocity? - ?Filter? - ?Flow field analysis? - ?Hydraulic performance? - ?Instability of flows? - ?Integrated layout optimizations? - ?Irrigation efficiency? - ?Optimization and performance
Classification code: 408.1 Structural Design, General
Structural Design, General
? - ?445.1 Water Treatment Techniques
Water Treatment Techniques
? - ?483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
? - ?631 Fluid Flow
Fluid Flow
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?723.5 Computer Applications
Computer Applications
? - ?821.3 Agricultural Methods
Agricultural Methods
? - ?921 Mathematics
Mathematics
? - ?921.5 Optimization Techniques
Optimization Techniques
? - ?951 Materials Science
Materials Science
Numerical data indexing: Percentage 2.00e+01%, Percentage 3.85e+01%, Time 1.20e+03s
DOI: 10.6041/j.issn.1000-1298.2018.10.035
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
42. Design and Test on Variable Rate Fertilization System Supporting Seeding and Fertilizing Monitoring
Accession number: 20185206314761
Authors: Yang, Shuo (1, 2); Wang, Xiu (2, 3); Zhai, Changyuan (4); Dou, Hanjie (2); Gao, Yuanyuan (1, 2); Zhao, Chunjiang (1, 3)
Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China; (3) National Engineering Research Center for Information Technology in Agriculture, Beijing; 100097, China; (4) Department of Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater; OK; 74078, United States
Corresponding author: Zhao, Chunjiang(zhaocj@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 145-153
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The current domestic integration of a variable rate fertilization system and a fertilizer feeder fault alarming system has a low level, and there is less research on dynamic response of a motor driving fertilization system. A variable rate fertilizing control system supporting seeding and fertilizing monitoring was designed based on a motor driving method. The system mainly included a touch screen, a central controller and a data collector. The central controller was designed based on an MCU, which monitored both the vehicle speed by using a GPS module and the fertilization motor speed in real time. The touch screen was used to set or read the operation parameters by communicating with the controller. The data collector monitored the working status of the multiple seed metering or fertilizer feeder. An experimental platform was built to evaluate the monitoring accuracy. When the sowing axle speed was 12.5~125 r/min and the monitoring sensitivity was set to 3 s, the accuracy of the fault alarming system was 100%. A test was conducted to find the system response time with different fertilization rates, the test results showed that the maximum system response time was 0.75 s when fertilization rate was from 0 g/min to 11 500 g/min. The prototype machine test result showed that when the fertilization rate was from 75 kg/hm2 to 450 kg/hm2 with an increment of 75 kg/hm2, the average system response time was 1.08 s. When the fertilization rates were 450 kg/hm2, 600 kg/hm2 and 750 kg/hm2 with different vehicle speeds, the average accuracies of fertilizer ejecting were 95.92%, 95.24% and 98.26%, and the variances were 3.01%, 1.39% and 1.36%, respectively. The field test results showed that when the fertilization rates were set to 450 kg/hm2, 600 kg/hm2 and 750 kg/hm2, the average accuracies of fertilizer ejecting was 94.69% with variance of 2.23%, and the accuracy of the fault alarm for multiple feeders was 100%. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Response time (computer systems)
Controlled terms: Controllers? - ?Feeding? - ?Fertilizers? - ?Flow visualization? - ?Monitoring? - ?Testing? - ?Touch screens
Uncontrolled terms: Experimental platform? - ?Fertilization rates? - ?Fertilizing planter? - ?Monitoring accuracy? - ?Multichannel? - ?Operation parameters? - ?System response time? - ?Variable rate fertilization
Classification code: 631.1 Fluid Flow, General
Fluid Flow, General
? - ?691.2 Materials Handling Methods
Materials Handling Methods
? - ?722.2 Computer Peripheral Equipment
Computer Peripheral Equipment
? - ?732.1 Control Equipment
Control Equipment
? - ?804 Chemical Products Generally
Chemical Products Generally
Numerical data indexing: Mass_Flow_Rate 0.00e+00kg/s to 1.92e-01kg/s, Percentage 1.00e+02%, Percentage 1.36e+00%, Percentage 1.39e+00%, Percentage 2.23e+00%, Percentage 3.01e+00%, Percentage 9.47e+01%, Percentage 9.52e+01%, Percentage 9.59e+01%, Percentage 9.83e+01%, Rotational_Speed 1.25e+01RPM to 1.25e+02RPM, Time 1.08e+00s, Time 3.00e+00s, Time 7.50e-01s
DOI: 10.6041/j.issn.1000-1298.2018.10.016
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
43. Comparison of Five Methods to Inverse Forest Height from Single-baseline PolInSAR Data
Accession number: 20185206314770
Authors: Zhang, Jianshuang (1); Fan, Wenyi (1); Mao, Xuegang (1); Yu, Ying (1)
Author affiliation: (1) School of Forestry, Northeast Forestry University, Harbin; 150040, China
Corresponding author: Fan, Wenyi(fanwy@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 220-229
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To provide the basis for the methods of vegetation height inversion by using single-baseline PolInSAR SAR data and explore a more effective inversion method, the European Space Agency (ESA) Toolbox PolSARPro was used to simulate L-band (L=23 cm) PolInSAR SAR data with an average vegetation height of 18 m. The DEM difference, RVoG, SINC, Hybrid, and Hybrid method were studied based on coherent optimization. The vegetation height ranged from 3m to 30m was analyzed with 1104 sample points in the middle region of the image. Giving a 3D image, range profile image with azimuth of 48 and statistical image of vegetation height and topographic phase were used to compare the performance of five methods. Compared with the real value of 18 m, the descending order of vegetation height means was SINC, Hybrid, improved Hybrid, RVoG and DEM difference method. The difference between the improved Hybrid inversion method and the real value was the smallest as 0.12 m, smaller than Hybrid of 0.31 m. RMSE of the improved Hybrid, Hybrid, SINC, RVoG and DEM difference was 1.06 m, 1.48 m, 3.49 m, 7.51 m and 8.04 m, respectively. The vegetation height of the improved Hybrid method had the smallest difference and RMSE. The estimated topographic phase average value of the improved Hybrid, RVoG/Hybrid and DEM difference method was -0.018 rad, 0.011 rad and 0.1 rad; RMSE was 0.045 rad, 0.054 rad and 0.15 rad; and mean value of absolute value was 0.03 rad, 0.04 rad, and 0.1 rad, respectively. The topographic phase of the improved Hybrid method was approximately the closest to the simulated and had the smallest RMSE and the mean of absolute value. Improved Hybrid inversion method produced the best result among the five methods, combining the merits of Hybrid with the coherent optimization, with the smallest difference between real value and RMSE of vegetation height and topographic phase. The Hybrid method was improved based on the coherent optimization and the accuracy of vegetation height was analyzed with the ground phase estimation results to compare the five methods. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 37
Main heading: Inverse problems
Controlled terms: Forestry? - ?Vegetation
Uncontrolled terms: DEM difference? - ?Forest height inversion? - ?Hybrid? - ?RVoG? - ?SINC
Numerical data indexing: Size 1.06e+00m, Size 1.20e-01m, Size 1.48e+00m, Size 1.80e+01m, Size 3.00e+00m to 3.00e+01m, Size 3.10e-01m, Size 3.49e+00m, Size 7.51e+00m, Size 8.04e+00m
DOI: 10.6041/j.issn.1000-1298.2018.10.025
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
44. Mixing Uniformity Analysis Methods and In-line Mixing Experiments of Mixer under Variable Working Conditions
Accession number: 20185206314764
Authors: Dai, Xiang (1); Xu, Youlin (1); Song, Haichao (1, 2); Chen, Junyang (1); Kuang, Liangjie (1); Ma, Luqiang (1)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing; 210037, China; (2) College of Mechanical Engineering, Nanjing Institute of Industry Technology, Nanjing; 210023, China
Corresponding author: Xu, Youlin(youlinxu@njfu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 172-179
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The high mixing uniformity for pesticides and carrier water was an important requirement in direct nozzle injection system (DNIS) used to alleviate the waste of pesticides and protect environment from being contaminated by pesticides residues. To evaluate the mixing effects of pesticides mixers, new analysis methods for mixing uniformity were presented and the swirling jet mixer was used to carry out the experiments of in-line mixing for the water and non-water soluble pesticides under variable working conditions. Quantitative descriptions for mixing uniformity of mixture inside the mixer were achieved based on calculating the coefficient of variation(α) and area-weighted uniformity index (γ) for the regions of interest(ROI) in the mixture images of the mixer. The accuracy of the analysis methods was verified by comparing the images of artificial premixed mixture and the images of unmixed mixture, as well as the images of mixture in standing state, and it proved that the indexes could be taken as criteria to judge whether the mixers could meet the requirements for in-line mixing or not. The experiments result under variable working conditions revealed that the mixing uniformity was increased with higher carrier flow rate and the flow rate of 2 400 mL/min gave rise to the best uniformity while the uniformity was declined heavily with lower flow rate under the conditions of settled mixing ratios. When the carrier flow rate was remained unchanged, higher mixing ratios would contribute to higher uniformity. Therefore, it was necessary to provide high flow rate to ensure good mixing uniformity when it came to lower mixing ratios. Normally, The criteria of α=0.223 9 and γ=80.39% were set to be the thresholds for uniform mixtures and non-uniform mixtures as there were no non-scatted pesticides remaining in the mixer when the indexes were better than them. Moreover, the filtering results showed that the flow rate which was higher than 2 000 mL/min could meet the uniformity requirements at different mixing ratios while the flow rate of 800 mL/min could not meet the uniformity requirements at any mixing ratios, and the mixing uniformity at part of these ratios could be satisfied when the flow rates were between 800 mL/min and 2 000 mL/min. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Mixing
Controlled terms: Flow rate? - ?Mixers (machinery)? - ?Mixtures? - ?Pesticides? - ?Water injection
Uncontrolled terms: Mixing uniformities? - ?Swirling jets? - ?Uniformity index? - ?Variable working conditions? - ?Variation coefficient
Classification code: 612.1 Internal Combustion Engines, General
Internal Combustion Engines, General
? - ?631 Fluid Flow
Fluid Flow
? - ?802.3 Chemical Operations
Chemical Operations
? - ?803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
DOI: 10.6041/j.issn.1000-1298.2018.10.019
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
45. 3D Virtual Plant Photosynthesis Simulation Model Based on L-system
Accession number: 20185206314776
Authors: Chen, Gang (1, 2); Chen, Bin (2, 3); Lin, Yuxin (4); Qian, Jide (1, 2)
Author affiliation: (1) Chengdu Institute of Computer Application, Chinese Academy of Sciences, Chengdu; 610041, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Guangzhou Institute of Electric Technology, Chinese Academy of Science, Guangzhou; 510070, China; (4) R&D Center, Net Dragon Websoft Inc., Fuzhou; 350001, China
Corresponding author: Chen, Bin(chenbin306@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 275-283
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To quantitatively analyze the relationship between plant canopy structure and light distribution and photosynthesis, simulate real time photosynthetic rate of plant canopy in actual environments, and prove a plant canopy scale photosynthetic productivity calculation method for crop yield estimation, a 3D virtual plant canopy photosynthesis simulation model was constructed based on L-system. The model was divided into three contents. The first sub-model was the 3D virtual canopy based on L-iterative grammar system and 3D graphic rendering technology. The second sub-model was that the photosynthetically active radiation (PAR) transformation in the virtual canopy was simulated by using forward ray tracing and sky visibility algorithm. The third sub-model was that the real-time PAR intensity at the top of a virtual canopy based on parameters such as the sun’s geometric parameters, atmospheric influence parameters and geographic location. After the photosynthetic environmental factors were directly or through interpolated way to input to the sub-models, by using the single leaf photosynthesis model and related respiration models, the net photosynthesis rate within the canopy and the accumulation of plant biomass accumulation during the model simulation cycle can be calculated. The simulation results of Chinese fir showed that the simulation of the PAR distribution based on the virtual canopy and the canopy photosynthesis rate calculation was an effective method for estimating photosynthetic productivity of plants. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Three dimensional computer graphics
Controlled terms: Iterative methods? - ?Photosynthesis? - ?Productivity
Uncontrolled terms: Canopy photosynthesis? - ?L-systems? - ?Radiation transmission? - ?Simulation model? - ?Virtual plants
Classification code: 723.2 Data Processing and Image Processing
Data Processing and Image Processing
? - ?741.1 Light/Optics
Light/Optics
? - ?921.6 Numerical Methods
Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2018.10.031
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
46. Analysis on Research Progress and Development Trend of Hose Reel Irrigator
Accession number: 20185206314746
Authors: Tang, Lingdi (1); Yuan, Shouqi (1); Tang, Yue (1)
Author affiliation: (1) National Research Center of Pumps, Jiangsu University, Zhenjiang; 212013, China
Corresponding author: Yuan, Shouqi(shouqiy@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 1-15
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to accommodate the rapid development of hose reel irrigators in China, enhance the overall awareness of key techniques for the hose reel irrigator and find the gap with the rest of the world, the development history in the world and the main types of hose reel irrigators were reviewed. Key influential factors and research status of the hose reel irrigator were described. The matching relationship among the uniformity of the traveling speed of the sprinkler cart, the traveling speed of the sprinkler cart, the rotating fan angle of the spray nozzle, and the rotating speed of the spray nozzle were concluded. And it was summarized that the running stability of the sprinkler cart, the stability of the nozzle inlet pressure, the attitude and topography of the nozzle were critical factors affecting the irrigation uniformity. Energy conversion efficiency and optimized matching of each component were the key factors affecting the energy consumption of the whole machine. From the scientific and technical point of view, the research progress and existing problems of key technologies such as drive power, transmission system, speed control, energy conversion of the key link and the sprayer cart stability were analyzed, the application basis and key techniques for the development of the hose reel irrigator in China were presented. The development trend of multifunctional and intelligentized hose reel irrigator was expected, and the idea of intelligent irrigation of hose reel irrigator based on Internet of things was proposed. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 99
Main heading: Hose
Controlled terms: Conversion efficiency? - ?Electric power transmission? - ?Energy conversion? - ?Energy utilization? - ?Reels? - ?Speed? - ?Spray nozzles? - ?Sprinkler systems (irrigation)
Uncontrolled terms: Development history? - ?Hose reels? - ?Influential factors? - ?Intelligent irrigations? - ?Irrigation uniformity? - ?Photovoltaic? - ?Transmission systems? - ?Water turbines
Classification code: 525.3 Energy Utilization
Energy Utilization
? - ?525.5 Energy Conversion Issues
Energy Conversion Issues
? - ?619.1 Pipe, Piping and Pipelines
Pipe, Piping and Pipelines
? - ?631.1 Fluid Flow, General
Fluid Flow, General
? - ?691.2 Materials Handling Methods
Materials Handling Methods
? - ?706.1.1 Electric Power Transmission
Electric Power Transmission
? - ?821.1 Agricultural Machinery and Equipment
Agricultural Machinery and Equipment
DOI: 10.6041/j.issn.1000-1298.2018.10.001
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
47. Hovering Attitude Control of Tilt Rri-rotor VTOL Aircraft
Accession number: 20185206314747
Authors: Xu, Jinghui (1, 2); Ma, He (1); Zhou, Jianfeng (3); Tian, Yuqiang (1); Han, Wenting (4)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) The Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China; (3) Division of Food Systems and Bioengineering, University of Missouri, Columbia; MO; 65211, United States; (4) Institute of Soil and Water Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Han, Wenting(hanwt2000@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 16-22
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to the control of a tilt tri-rotor vertical take-off and landing (VTOL) aircraft, and the flight control system based on STM32 microprocessor was designed. Ten axes inertial navigation module was used to collect the real time position data and satellite navigation data of the carrier, and the attitude and location information was calculated by using fusion algorithm based on quaternion. Cascade PID control system was adopted, aiming at the real-time and high-accuracy feature of attitude control of UAV. Aiming at the unstable problem in the tilt tri-rotor VTOL aircraft, a PID controller with incomplete derivative was proposed. The controller adding a first-order inertial link in the derivative can reduce the negative effect of external interference on the system. Finally, the verify flight was carried out to test the pitch, yaw and roll motions of the aircraft. The results demonstrated that cascade PID controller with incomplete derivative can control the attitude of the tilt tri-rotor VTOL aircraft quickly, stably and accurately in helicopter mode, which had good robustness. In addition, cascade PID controller with incomplete derivative can reduce the difficulty of parameter tuning. The control system had a good performance with the setting of roll angle (inner ring Kp was 8.371, Kd was 3.015 and outer ring Kp was 5.1, Kd was 1.15), pitch angle (inner ring Kp was 3.137, Kd was 1.6 and outer ring Kp was 3.43, Ki was 0.003, Kd was 3.97), yaw angle (Kp was 9.30 and Ki was 0.11). And the controller designed could meet the performance requirements of the control system. It provided guidance for the follow-up study on flight control of the tilt tri-rotor VTOL aircraft. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: VTOL/STOL aircraft
Controlled terms: Air navigation? - ?Aircraft control? - ?Aircraft landing? - ?Attitude control? - ?Controllers? - ?Electric control equipment? - ?Flight control systems? - ?Proportional control systems? - ?Three term control systems? - ?Unmanned aerial vehicles (UAV)
Uncontrolled terms: External interference? - ?Inertial navigations? - ?Location information? - ?Performance requirements? - ?Satellite navigation? - ?Stm32 microprocessors? - ?Vertical take-off and landings? - ?Vertical takeoff and landing aircraft (VTOL)
Classification code: 431.5 Air Navigation and Traffic Control
Air Navigation and Traffic Control
? - ?652 Aircraft and Avionics
Aircraft and Avionics
? - ?652.1 Aircraft, General
Aircraft, General
? - ?731.1 Control Systems
Control Systems
? - ?731.3 Specific Variables Control
Specific Variables Control
? - ?732.1 Control Equipment
Control Equipment
DOI: 10.6041/j.issn.1000-1298.2018.10.002
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
48. Investigation on Urban Object Classification Based on Spectral Unmixing
Accession number: 20185206314768
Authors: Huang, Zuowei (1); Hu, Guangwei (1); Xie, Shixiong (1)
Author affiliation: (1) Hunan Provincial Key Laboratory of Comprehensive Utilization of Agricultural and Animal Husbandry Waste Resources, Hunan University of Technology, Zhuzhou; 412000, China
Corresponding author: Hu, Guangwei(huguangwei5188@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 205-211
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: One of the prominent problems in hyperspectral remote sensing is the existing of mixed pixel widely. How to effectively interpret mixed pixels is an important problem of hyperspectral remote sensing applications. It is not only a problem of mixed pixels effects identification and classification precision of objects, but also a major barrier for the development of remote sensing technology. Mixed pixel decomposition, which is the most effective method to solve the mixed pixel problem, can break through the limitation of spatial resolution. Aiming to the shortcoming of the traditional algorithm of mixed pixel decomposition, an improved method of mixed pixels was put forward, which can take account of the spatial correlation of spectral information and spectral information, and multi-core parallel processing method to raise its efficiency. The endmembers were automatically extracted, and the abundance charts corresponding to each endmember were obtained at the same time. The performance of the proposed algorithm was verified by using actual hyperspectral image. The experimental results on simulated and real hyperspectral image demonstrated that the proposed algorithm can overcome the shortcomings of traditional method and obtain more accurate endmembers and corresponding abundance, which can provide a strong support for urban object classification. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Pixels
Controlled terms: Image processing? - ?Remote sensing? - ?Spectroscopy
Uncontrolled terms: Classification precision? - ?Endmember extraction? - ?Hyperspectral remote sensing? - ?Object classification? - ?Remote sensing technology? - ?Spatial characteristics? - ?Spectral information? - ?Spectral unmixing
DOI: 10.6041/j.issn.1000-1298.2018.10.023
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2019 Elsevier Inc.
Data Provider: Engineering Village
49. Design and Test of Cleaning Device for Roller Rubbing Cylinder Sieve of Millet
Accession number: 20185206314756
Authors: Li, Xinping (1); Meng, Yajuan (1); Zhang, Jialiang (1); Geng, Lingxin (1); Ji, Jiangtao (1)
Author affiliation: (1) College of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang; 471003, China
Corresponding author: Ji, Jiangtao(jjt0907@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 49
Issue: 10
Issue date: October 25, 2018
Publication year: 2018
Pages: 92-102 and 136
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to solve the problem of high impurity rate and loss rate caused by the residual grain codes and the high moisture content in the raw material of millet after the first stripping, a roll-twist cylinder screen type of millet cleaning device was designed. The device was mainly composed of spikelet roller rubbing device, cylinder screen device, cross flow fan and centrifugal fan, which realized the function of clearing millet code first and then cleaning it. The rotating speed and angle of centrifugal fan, speed of cross flow fan, rotational speed of cylinder screen as well as the rotational speed of spikelet roller rubbing device were selected as the test factors, the impurity rate and the loss rate were taken as the test indexes for the orthogonal test. Results of orthogonal test showed that the optimal combination of the cleaning device was the rotation speed of spikelet roller rubbing device as 250 r/min, the angle of centrifugal fan as 3°, the speed of small cylinder screen as 60 r/min, the speed of centrifugal fan as 700 r/min, the speed of medium cylinder screen as 60 r/min, the speed of large cylinder screen as 70 r/min, and the speed of cross flow fan as 600 r/min. The combination of the parameters was tested and the cleaning performance of the device was compared, under such conditions, the impurity content was 1.64%, the loss rate was 0.86%, the impurity rate and loss rate of this device were lower than those of traditional fan cylinder screen and fan vibrating screen cleaning device. ? 2018, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Cylinders (shapes)
Controlled terms: Cleaning? - ?Fans? - ?Radial flow turbomachinery? - ?Rollers (machine components)? - ?Speed
Uncontrolled terms: Centrifugal fans? - ?Cleaning devices? - ?High moisture contents? - ?Impurity content? - ?Millet? - ?Optimal combination? - ?Roller rubbing cylinder device? - ?Rotational speed
Classification code: 601.2 Machine Components
Machine Components
? - ?618.3 Blowers and Fans
Blowers and Fans
? - ?802.3 Chemical Operations
Chemical Operations
Numerical data indexing: Percentage 1.64e+00%, Percentage 8.60e-01%, Rotational_Speed 2.50e+02RPM, Rotational_Speed 6.00e+01RPM, Rotational_Speed 6.00e+02RPM, Rotational_Speed 7.00e+01RPM, Rotational_Speed 7.00e+02RPM
DOI: 10.6041/j.issn.1000-1298.2018.10.011
Compendex references: YES
Database: Compendex
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