2020年第5期共收錄47篇
1. Key Information Extraction of Forestry Text Based on TextRank and Clusters Filtering
Accession number: 20202508853477
Title of translation: TextRank
Authors: Chen, Zhibo (1); Li, Yuman (1); Xu, Fu (1); Feng, Guoming (2); Shi, Dongyu (3); Cui, Xiaohui (1)
Author affiliation: (1) School of Information Science and Technology, Beijing Forestry University, Beijing; 100083, China; (2) China United Network Communications Group Co., Ltd., Beijing; 100033, China; (3) China Telecom System Integration Co., Ltd., Beijing; 100035, China
Corresponding author: Xu, Fu(xufu@bjfu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 207-214 and 172
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: There are two main problems in obtaining key information of forestry text, firstly, the key information is mainly considered from the perspective of keywords, and the information types of words are neglected; secondly, there is no unified description structure for forestry text on the Internet, which makes it difficult to extract word information types. Through combining the two characteristics of “keywords+information types”, a method about forestry text key information extraction was proposed based on inproved TextRank and clusters filtering. The main contents were as follows: the first step was to extract the text keywords according to the keywords extraction formula. The second step was to characterize the keywords with Word2Vec vectorization. The third step was to improve the TextRank algorithm, mainly by merging the word features and introducing the edge weights to construct the graph model of the text. The fourth step was to obtain the stable graph structures through iterative convergence, and then merged them to form clusters. And the clusters’s quality was evaluated from three aspects: the uniformity of elements distribution, the size of the clusters, and the universality of the clusters. The fifth step was to form the final clusters’set in combination with the TextRank algorithm. The final step was to label the final clusters about information types. The data used in the experiments were 2 000 forestry texts related to forestry policies and news. The experimental results showed that compactness of the final clusters’ set was 0.968 0, the separation of the final clusters’ set was 0.057 2, and the F1-measure of the final clusters’ set was 0.887 1. It showed that the information types of the clusters can be clearly marked. For a text’s keywords, their information type was obtained by calculating the cosine similarity of the keywords’ vector and the clusters’ heart. The combination of keywords and information types constituted key information of a foresty text. Meanwhile, manually labeled 400 texts, comparing with the six algorithms such as TextRank, TF-IDF, this method achieved the better results in MRR, Bpref, accuracy, and F1-measure. It showed that this method had advantages in extracting forestry text keywords. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 36
Main heading: Information filtering
Controlled terms: Clustering algorithms? - ?Forestry? - ?Graph algorithms? - ?Graph structures? - ?Graph theory? - ?Information retrieval? - ?Iterative methods? - ?Structure (composition)? - ?Timber
Uncontrolled terms: Cosine similarity? - ?Elements distribution? - ?Forestry policy? - ?Form clusters? - ?Information types? - ?Keywords extraction? - ?Unified description? - ?Vectorization
Classification code: 903.1 Information Sources and Analysis? - ?903.3 Information Retrieval and Use? - ?921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory? - ?921.6 Numerical Methods? - ?951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2020.05.023
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
2. Design and Experiment of Pneumatic Wheat Precision Seed Casting Device in Rice-wheat Rotation Areas
Accession number: 20202508853782
Title of translation:
Authors: Wang, Chao (1); Li, Hongwen (1); He, Jin (1); Wang, Qingjie (1); Lu, Caiyun (1); Wang, Jingxu (2)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Mechanical and Electrical Engineering, Wenzhou University, Wenzhou; 325035, China
Corresponding author: Li, Hongwen(lhwen@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 43-53
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to realize wheat precision seeding under clay-wet soil conditions of rice-wheat rotation area, a pneumatic wheat precision seed casting device was developed that casting wheat to clean seedbeds fast and accurately by pneumatic acceleration. The influence of key structural parameters of outlet chamber diameter, throat distance and convergent chamber diameter on velocity of steady gas flow and inlet negative pressure, as test indicators, were studied by numerical simulation and analysis of Fluent software. Analysis results by Fluent showed that the parameter combination of pneumatic wheat precision seed casting device was as follows: diameter of outlet chamber was 6 mm, throat distance was 10 mm and convergent chamber diameter was 32 mm obtained by single factor test as well as three factors and three levels orthogonal experiment. Under this parameter conditions, the velocity of steady gas flow was 524 m/s and inlet negative pressure was 15.966 kPa, by simulation. Wheat seed casting performance experiment, based on better parameter combination, by test-bed indicated that wheat seed can be casted into soil at high speed to achieve accurate and stable single seed sowing without damage while working speed was 1.2 m/s, casting height was 0.1 m and air pressure was 0.5 MPa. Moreover, the average vesting velocity was 43.8 m/s, average depth was 6.78 mm, and the coefficient of variation of vesting velocity and average depth was 8.3% and 5.8%, respectively, which showed the stable performance of pneumatic seed casting. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 33
Main heading: Pneumatics
Controlled terms: Flow of gases? - ?Software testing? - ?Velocity
Uncontrolled terms: Coefficient of variation? - ?Orthogonal experiment? - ?Parameter combination? - ?Parameter conditions? - ?Performance experiment? - ?Rice-wheat rotations? - ?Simulation and analysis? - ?Structural parameter
Classification code: 631.1.2 Gas Dynamics? - ?632.3 Pneumatics? - ?723.5 Computer Applications
Numerical data indexing: Percentage 5.80e+00%, Percentage 8.30e+00%, Pressure 1.60e+04Pa, Pressure 5.00e+05Pa, Size 1.00e-01m, Size 1.00e-02m, Size 3.20e-02m, Size 6.00e-03m, Size 6.78e-03m, Velocity 1.20e+00m/s, Velocity 4.38e+01m/s, Velocity 5.24e+02m/s
DOI: 10.6041/j.issn.1000-1298.2020.05.005
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
3. Sensitivity Analysis of Aircraft Assembly Error Based on State Space Model
Accession number: 20202508853502
Title of translation:
Authors: Sun, Chongfei (1, 2); Li, Xin (3); Zhu, Yiming (4); Shang, Jianzhong (1); Luo, Zirong (1); He, Lijun (5)
Author affiliation: (1) College of Intelligence Science and Technology, National University of Defense Technology, Changsha; 410073, China; (2) School of Mechanical Engineering, Shandong University of Technology, Zibo; 255049, China; (3) State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Hefei; 230037, China; (4) School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester; M17JR, United Kingdom; (5) Training Base, Army Logistical University, Wuhan; 430035, China
Corresponding author: Li, Xin(lixinkiller@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 421-426
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The aircraft has the characteristics of many parts, complicated structure and high assembly accuracy requirements, and its assembly has requirements for safety assembly and less reversible assembly and so on. Based on the key product characteristics (KPC) and key control characteristics (KCC) parameters of aircraft, a theoretical method for assembly error sensitivity quantification analysis based on the state space model was proposed. And the error sensitivities in the precision assembly process of the butted-joint assembly of the aircraft were elaborated and defined, which were divided into three levels: feature level, position level and system level. The relationship between input vector and input matrix was obtained by solving the state space model of aircraft and its output equation, and the state transition matrix was obtained, and then the theoretical expressions of different levels of error sensitivity were obtained. The random assembly feature error value which obeys normal distribution was substituted into system matrix. Monte Carlo simulation was used to calculate the sensitivity indexes of different assembly features. And the sensitivity indexes of feature level obtained by theoretical calculation and Monte Carlo simulation respectively were compared and analyzed. The results showed that it was feasible to apply the sensitivity analysis method of dynamic system to the accuracy prediction and analysis of the butted-joint assembly of the aircraft. The analysis method of aircraft assembly error sensitivity analysis based on state space model proposed was accurate and reasonable. This research method had positive significance for the accuracy evaluation of the butted-joint precise assembly process of the aircraft. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Assembly
Controlled terms: Aircraft? - ?Errors? - ?Intelligent systems? - ?Monte Carlo methods? - ?Normal distribution? - ?Sensitivity analysis? - ?State space methods? - ?Vector spaces
Uncontrolled terms: Complicated structures? - ?Key control characteristics? - ?Key product characteristics? - ?Quantification analysis? - ?State - space models? - ?State transition Matrix? - ?Theoretical calculations? - ?Theoretical expression
Classification code: 652.1 Aircraft, General? - ?723.4 Artificial Intelligence? - ?921 Mathematics? - ?922.1 Probability Theory? - ?922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2020.05.047
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
4. Improvement of Cavitation Characteristics of Centrifugal Pump by Balanced Hole Offset
Accession number: 20202508853873
Title of translation:
Authors: Wang, Dongwei (1, 2); Liu, Zailun (1, 2); Zhao, Weiguo (1, 2)
Author affiliation: (1) School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; (2) Key Laboratory of Fluid Machinery and Systems, Lanzhou; Gansu Province; 730050, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 142-150
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Cavitation is a physical phenomenon of centrifugal pump internal flow, during the operation of centrifugal pump, cavitation will directly lead to deterioration of hydraulic performance, and it seriously affects the safety and stability of the pump system. Therefore, it is of great significance to seek ways to improve the cavitation performance of centrifugal pump for safe and stable operation of centrifugal pump system. In order to further improve the cavitation characteristics of centrifugal pump, a method to suppress cavitation by moving the balance hole to the back of blade was proposed. According to the characteristics of centrifugal pump cavitation flow field, based on RNG k-Ε turbulence model and Zwart-Gerber-Belamri cavitation model, the cavitation flow field with different cavitation numbers in the model before and after balance hole offset was calculated and analyzed. The results showed that compared with the experimental values of the original model, the head was decreased within 4% and the efficiency was decreased within 5% after balance hole offset. The critical cavitation number was decreased after the balance hole offset at flow rates of 1.2Qe, Qe and 0.8Qe. After the offset of balance hole, the distribution of static pressure zone on the back of the blade was changed. And the velocity in the low-pressure area on the back of the blade was reduced, at the same time, the turbulent kinetic energy in the flow passage can be effectively improved and it can inhibit the cavitation at all stages. Balanced hole offset can effectively reduce the volume fraction of the flow passage, improve the flow condition in impeller runner and reduce the blockage of flow passage by cavitation. The bubble volume in impeller was decreasesd obviously after balance hole offset and the fluctuation amplitude was decreased in a rotation period. The axial force was reduced and the mechanical condition of centrifugal pump was improved. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Cavitation
Controlled terms: Centrifugal pumps? - ?Deterioration? - ?Flow fields? - ?Impellers? - ?Kinetic energy? - ?Kinetics? - ?Turbulence models
Uncontrolled terms: Cavitation characteristics? - ?Cavitation performance? - ?Experimental values? - ?Fluctuation amplitudes? - ?Hydraulic performance? - ?Physical phenomena? - ?Safety and stabilities? - ?Turbulent kinetic energy
Classification code: 601.2 Machine Components? - ?618.2 Pumps? - ?631.1 Fluid Flow, General? - ?631.1.1 Liquid Dynamics? - ?951 Materials Science
Numerical data indexing: Percentage 4.00e+00%, Percentage 5.00e+00%
DOI: 10.6041/j.issn.1000-1298.2020.05.015
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
5. Specular Reflection Removal of UAV Image in Corn Canopy LAI Inversion
Accession number: 20202508853763
Title of translation: LAIUAV
Authors: Su, Wei (1, 2); Xie, Zixuan (1, 2); Wang, Wei (1, 2); Jin, Tian (1, 2); Wang, Xinsheng (1, 2)
Author affiliation: (1) College of Land Science and Technology, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Remote Sensing for Agri-Hazards, Ministry of Agriculture and Rural Affairs, Beijing; 100083, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 173-181
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 accuracy of inversion of corn canopy LAI, it is necessary to study the effect of specular reflection on the image reflectance of unmanned aerial vehicle (UAV), which is independent of canopy structure. The wavelet transform was used to set the threshold of different bands of UAV image, and the specular reflection was weakened without affecting the diffuse reflection. The vegetation indices: NDVI, GNDVI, SAVI and EVI were constructed by using multi-spectral UAV images of the Hebei Agricultural University Xinji Test Station acquired on July 15th and 26th, 2018. The single-variable inversion model of maize canopy LAI was constructed, and the accuracy of LAI inversion was evaluated by R2 and RMSE. The results showed that when the maize plants were sparse on July 15th, the R2 of vegetation indices and measured LAI after removing specular reflection were raised from 0.719 0, 0.559 8, 0.624 1 and 0.598 5 to 0.763 3, 0.694 0, 0.649 7 and 0.619 4, and the RMSE was also decreased from 0.224 4, 0.252 6, 0.221 4 and 0.224 5 to 0.188 0, 0.195 8, 0.191 8 and 0.198 7, which showed that removing specular reflection can improve the accuracy of LAI inversion. On July 26th, when the maize plants were relatively dense, the R2 of the four indices were also increased after the removal of specular reflection, which proved that the removal of specular reflection could improve the correlation between vegetation indices and LAI. However, in this case, NDVI and GNDVI tended to be saturated, and reducing the reflectivity by threshold method would aggravate the saturation phenomenon, so the two indices could not fully reflect the change of LAI. Meanwhile, SAVI and EVI were amplified by adding a canopy background adjustment factor, and their R2 of fitting model with ln(LAI) were both over 0.6 after removing specular reflection. Thus SAVI and EVI were more suitable for LAI inversion when vegetation cover was dense. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Unmanned aerial vehicles (UAV)
Controlled terms: Agricultural robots? - ?Antennas? - ?Forestry? - ?Reflection? - ?Vegetation? - ?Wavelet transforms
Uncontrolled terms: Adjustment factors? - ?Diffuse reflection? - ?Inversion models? - ?Saturation phenomenons? - ?Specular reflection removals? - ?Specular reflections? - ?Threshold methods? - ?Vegetation index
Classification code: 652.1 Aircraft, General? - ?921.3 Mathematical Transformations
DOI: 10.6041/j.issn.1000-1298.2020.05.019
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
6. Detection Method of Headland Boundary Line Based on Machine Vision
Accession number: 20202508853448
Title of translation:
Authors: Wang, Qiao (1); Liu, Hui (2); Yang, Pengshu (1, 2); Meng, Zhijun (1)
Author affiliation: (1) National Engineering Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China; (2) College of Information Engineering, Capital Normal University, Beijing; 100048, China
Corresponding author: Meng, Zhijun(mengzj@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 18-27
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In unstructured and complicated filed operation environment, the realization of autonomous navigation turning of agricultural machinery at the headland area of field is one of the key technical bottlenecks for achieving the autonomous navigation walking of agricultural machinery throughout the field. The primary task of realizing the former is to timely and accurately perceive the spatial position information of the headland area, especially the location information of the headland boundary. Based on machine vision technology, whether the headland appeared in the image or not was firstly determined according to the jumping characteristics of the gray values of pixels inside and outside the field. Specifically, two metric values of positive and negative distribution deviations were established to describe the positive and negative dispersion degree between the average pixel gray values of different rows in the image. When one of the two metric values was larger than the judgment threshold, that was, the distribution of the average values was relatively dispersed, it can be considered that the jumping characteristics had occurred and it was judged that the headland was appearing in the image. Subsequently, the image was evenly divided into eight sub-processing regions along the horizontal direction. For each sub-processing region, the distribution curve of the row gray average values was obtained and smoothed by local weighted regression method. The in-order outlier parameter was established, and based on the degree of sequential outlier of the row gray average values corresponding to the peak points or trough points on the smoothed curve, the position coordinates of the jumping peak point and pre-jumping trough point were determined, and accordingly the pixel coordinates of the jumping feature points were determined. Finally, all the jumping feature points were fitted linearly based on the robust regression method to obtain the main-body extended azimuth line of the irregular headland boundary. In the end, the main-body extension azimuth line was moved down in parallel until the average gray value of the pixels on the line was close to the corresponding gray distribution characteristic of the pixels inside the field, which was considered to be shifted to the safe position, thus the boundary line for safe turning of agricultural machinery at the current headland of field was obtained. The test results showed that the accuracy rate of judging whether the headland appeared or not was not less than 96%, the detection accuracy rate of headland boundary line was not less than 92%, and the processing time of single frame image was not higher than 0.52 s based on Matlab platform. It can provide a fast, accurate and reliable technical support for agricultural machinery to implement automatic navigation turning safely at the headland of field. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Computer vision
Controlled terms: Agricultural machinery? - ?Agricultural robots? - ?Agriculture? - ?Banks (bodies of water)? - ?Navigation? - ?Pixels? - ?Regression analysis? - ?Statistics
Uncontrolled terms: Automatic navigation? - ?Autonomous navigation? - ?Detection accuracy? - ?Distribution curves? - ?Local weighted regression? - ?Location information? - ?Position coordinates? - ?Single frame image
Classification code: 407.2 Waterways? - ?723.5 Computer Applications? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?821.1 Agricultural Machinery and Equipment? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 9.20e+01%, Percentage 9.60e+01%, Time 5.20e-01s
DOI: 10.6041/j.issn.1000-1298.2020.05.002
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
7. Effect of Salt and Organic-Inorganic Fertilizer Application on Soil Nitrogen Mineralization
Accession number: 20202508853418
Title of translation:
Authors: Zhou, Hui (1); Shi, Haibin (1); Guo, Jiawei (1); Xu, Zhao (1); Fu, Xiaojun (2); Li, Zhengzhong (2)
Author affiliation: (1) College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Huhhot; 010018, China; (2) Shahaoqu Irrigation Experimental Station, Jiefangzha Management Bureau of Hetao Irrigation District, Bayannur; 015400, China
Corresponding author: Shi, Haibin(shi_haibin@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 295-304
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Nitrogen mineralization is an important ecological process that determines ability of soil nitrogen supply. In order to provide theoretical basis for efficient fertilizer application in salinized soil, the effect of organic and inorganic fertilizers on the soil net nitrification, ammonification and nitrogen mineralization under different soil salinity were determined. By laboratory aerobic incubation, under four salt levels (0.46 dS/m, 0.98 dS/m, 1.55 dS/m and 1.97 dS/m), the same amount of nitrogen of 0.089 5 g/kg (dry weights of pure fertilizer/dry weights of purple soil) was applied to different treatments, and five fertilization treatments (the fertilization proportion of the organic fertilizer was 0, 25%, 50%, 75% and 100%, respectively) and one blank control were provided, which were designated as U1, U3O1, U1O1, U1O3, O1 and CK, respectively. Main conclusions were as follows: soil salt concentration was decreased with the increase of proportion of organic fertilizer applied; the increase of salt content had a strong inhibition on the amination of inorganic fertilizer. When the EC was less than 0.98 dS/m, the application of organic fertilizer would reduce the effect of salt on amination, while when the EC was raised above 1.55 dS/m, it would obviously delay the amination process of organic fertilizer, but it would not be completely suppressed. There was a threshold value for the effect of salinity on the formation rate of NO3--N. When the EC was less than 0.98 dS/m, the increase rate of NO3--N was increased with the increase of salinity level, while the continuous increase of salinity would inhibit the formation rate of NO3--N. Compared with no fertilizer, fertilizer significantly increased the amount of net nitrogen mineralization in each salt soil, and the same salt level showed that the larger proportion of inorganic fertilizer was applied, the greater amount of net nitrogen mineralization was. Compared with the application of organic fertilizer under 0.46 dS/m, the difference of net nitrogen mineralization between the treatments under 0.98 dS/m salt level was decreased, while when the salt content was increased to 1.55 dS/m and above, salt obviously delayed the mineralization process of organic fertilizer. It was recommended that the suitable fertilizer modes for different salt levels were as follows: non-saline soil (50% urea+50% organic fertilizer), mild saline soil (100% organic fertilizer), moderate and heavily saline soil (75% urea+25% organic fertilizer). ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 54
Main heading: Nitrogen fertilizers
Controlled terms: Amines? - ?Forestry? - ?Metabolism? - ?Mineralogy? - ?Soils? - ?Urea
Uncontrolled terms: Aerobic incubation? - ?Different treatments? - ?Fertilizer applications? - ?Inorganic fertilizers? - ?Mineralization process? - ?Nitrogen mineralization? - ?Organic fertilizers? - ?Soil-nitrogen mineralization
Classification code: 482 Mineralogy? - ?483.1 Soils and Soil Mechanics? - ?804 Chemical Products Generally? - ?804.1 Organic Compounds
Numerical data indexing: Percentage 1.00e+02%, Percentage 2.50e+01%, Percentage 5.00e+01%, Percentage 7.50e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.032
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
8. Finite Element Modeling and Testing for Force-measuring Wheel Based on ABAQUS
Accession number: 20202508853412
Title of translation: ABAQUS
Authors: Liu, Li (1, 2); Tao, Liang (1); Sun, Xiaoming (3); Zhang, Xiaolong (1, 2); Qian, Peng (1)
Author affiliation: (1) School of Engineering, Anhui Agricultural University, Hefei; 230036, China; (2) Anhui Province Engineering Laboratory of Intelligent Agricultural Mcehinery and Eguipment, Hefei; 230036, China; (3) Anhui Giti Passenger Radial Tire Co., Ltd., Hefei; 230601, China
Corresponding author: Zhang, Xiaolong(xlzhang@ahau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 387-394
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Tire force information is the basis of research on vehicle dynamics control system and vehicle reliability, and the most effective means for tire force testing is force-measuring wheel sensor (i.e. force-measuring wheel). At present, the research on force-measuring wheel mainly focused on elastomer components, and in view of the significant influence of tire on the motion characteristics of vehicle, the whole force-measuring wheel, including elastomer and rubber tire body was modeled and tested. Firstly, the structure of force-measuring wheel was introduced in detail. Besides, the method of modeling tire carcass and the method of dealing with contact problems between components were clarified, and a finite element model of the force-measuring wheel prototype (meridian tire 195/65R15) was established. Then, based on the tire stiffness machine, the bench test of vertical working condition, lateral working condition and longitudinal working condition of force-measuring wheel prototype was carried out. Finally, the finite element simulation analysis of force-measuring wheel under three working conditions were executed. The comparative analysis of test and simulation results showed that the maximum absolute values of the relative error of strain values of each measuring point under the three working condition were 4.86%, 3.92% and 3.15%, which indicated that the modeling method determined was feasible, and the model can accurately reflect the wheel force under steady-state conditions. The rubber carcass and elastomer as a whole were studied, which laid a foundation for the decoupling optimization of the multi-dimensional force structure of force-measuring wheel. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Finite element method
Controlled terms: ABAQUS? - ?Elastomers? - ?Plastics? - ?Tire industry? - ?Tires? - ?Vehicle wheels
Uncontrolled terms: Comparative analysis? - ?Finite element simulations? - ?Method of modeling? - ?Motion characteristics? - ?Multi dimensional? - ?Steady-state condition? - ?Vehicle dynamics control system? - ?Vehicle reliability
Classification code: 601.2 Machine Components? - ?817.1 Polymer Products? - ?818 Rubber and Elastomers? - ?921 Mathematics? - ?921.6 Numerical Methods
Numerical data indexing: Percentage 3.15e+00%, Percentage 3.92e+00%, Percentage 4.86e+00%
DOI: 10.6041/j.issn.1000-1298.2020.05.043
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
9. Design and Test of Grain Dryer Heat Pump Based on Vapor Injection Technology
Accession number: 20202508853446
Title of translation:
Authors: Yu, Haiming (1); Liu, Haolu (2); Zhang, Zhengwei (1); Zhang, Dacheng (1); Wang, Jun (1); Chen, Kunjie (1)
Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China; (2) Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing; 210014, China
Corresponding author: Chen, Kunjie(kunjiechen@njau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 363-369
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to expand the working range of heat pump and improve the applicable range and annual utilization rate of heat pump system, an air source heat pump unit with vapor injection technology was designed. The heat recovery device was used to recover the waste heat from the dryer exhaust gas to preheat the fresh air. The heat pump unit consisted of three sets of heat pumps with different powers. The heat pump unit’s start-stop combination adapted to different process requirements and environmental conditions, heat pump can improve the annual energy efficiency ratio by this way, and the enhanced vapor injection technology improved the performance of the heat pump system in low temperature environment. The designed heat pump unit was tested. When the ambient temperature was -5, the air supply temperature of the heat pump was 40 and the COP of the heat pump was 2.21, the air supply temperature of the heat pump used enhanced vapor injection was 45 and the COP of the heat pump used enhanced vapor injection was 2.33. The experimental results showed that the validity of vapor injection technology and the designed heat pump can meet the operating requirements of recirculation drier under different environmental conditions. This study was of great practical significance for the development of green and energy-saving drying process equipment system. The results showed that the heat pump dryer can be applied to rice and wheat drying operations in the Jianghuai region. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Air source heat pumps
Controlled terms: Dryers (equipment)? - ?Energy efficiency? - ?Environmental technology? - ?Pumps? - ?Temperature? - ?Waste heat? - ?Waste heat utilization
Uncontrolled terms: Design and tests? - ?Energy efficiency ratio? - ?Environmental conditions? - ?Heat recovery device? - ?Low temperature environment? - ?Operating requirements? - ?Process requirements? - ?Utilization rates
Classification code: 454 Environmental Engineering? - ?525 Energy Management and Conversion? - ?618.2 Pumps? - ?641.1 Thermodynamics? - ?641.2 Heat Transfer
DOI: 10.6041/j.issn.1000-1298.2020.05.040
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
10. Design and Experiment of Soil Moisture Sensor Based on RC Peak Detection
Accession number: 20202508853489
Title of translation: RC
Authors: Sheng, Qingyuan (1); Ni, Mengyao (2); Zhang, Xiliang (2); Li, Pingping (3)
Author affiliation: (1) School of Mechanical and Electrical Engineering and Transportation, Shaoxing Vocational and Technical College, Shaoxing; 312000, China; (2) School of Mechanical Engineering, Jiangsu University, Zhenjiang; 212013, China; (3) College of Forest Resources and Environment, Nanjing Forestry University, Nanjing; 210037, China
Corresponding author: Zhang, Xiliang(190337373@qq.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 324-330
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: For the modern intelligent irrigation system, a moisture sensor with high measurement accuracy, low power consumption, low price, small structure and simple calibration process is urgently needed. A capacitive low-cost soil moisture sensor and its signal processing circuit was presented based on the principle of RC steady-state response peak detection. The characteristic of the sensor circuit was that a RC series circuit realized slow charge and fast discharge by adding a discharge diode. The influence of the sensor’s sensitive area, electrical characteristics, calibration model, temperature drift and conductivity on the output signal was tested. Experimental data analysis showed that the average sensitivity of the sensor for measuring volumetric water content was 12.187 mV, and the sensitive area was 3.8 cm×2.5 cm×7.2 cm; the output signal of the sensor was not affected by the supply voltage, and the current consumption was only 3~4 mA; by calibrating in different dielectric constant solutions and combining TOPP’s empirical formula, based on working principle the exponential calibration model of the sensor can be well fitted to the relationship between relative dielectric constant and soil volumetric moisture content, and the determination coefficient R2 was greater than 0.96. In the range of 5~50, the measurement error caused by the temperature drift of the sensor was about 0.5%. In the range of 0~2 000 μS/cm, the maximum measurement error of the sensor caused by conductivity was less than 4.2%. The measured data in Loess and cinnamon soil showed that the maximum error of the sensor was 2.17%. Compared with similar sensors, the test accuracy was comparable, and the cost-effective advantage was obvious. It was especially suitable for large-scale wireless soil moisture sensor detection systems. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Moisture control
Controlled terms: Capacitive sensors? - ?Cost effectiveness? - ?Measurement errors? - ?Moisture meters? - ?Signal processing? - ?Soil moisture? - ?Water content
Uncontrolled terms: Determination coefficients? - ?Electrical characteristic? - ?Experimental data analysis? - ?Intelligent irrigation systems? - ?Relative dielectric constant? - ?Signal processing circuits? - ?Volumetric moisture content? - ?Volumetric water content
Classification code: 483.1 Soils and Soil Mechanics? - ?716.1 Information Theory and Signal Processing? - ?732 Control Devices? - ?911.2 Industrial Economics? - ?944.1 Moisture Measuring Instruments? - ?944.2 Moisture Measurements
Numerical data indexing: Electrical_Conductivity 0.00e+00S/m to 2.00e-01S/m, Percentage 2.17e+00%, Percentage 4.20e+00%, Percentage 5.00e-01%, Voltage 1.22e-02V
DOI: 10.6041/j.issn.1000-1298.2020.05.035
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
11. Design and Test of Combined Operation Machine for Double Width Filming and Covering Soil on Double Ridges
Accession number: 20202508853410
Title of translation:
Authors: Dai, Fei (1); Zhang, Shilin (1); Song, Xuefeng (1); Zhao, Wuyun (1); Ma, Haijun (2); Zhang, Fengwei (1)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou; 730070, China; (2) Gansu Tao River Tractor Manufacturing Co., Ltd., Dingxi; 730500, China
Corresponding author: Zhao, Wuyun(zhaowy@gsau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 108-117
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Whole plastic mulching and furrow planting has been widely adopted as a drought resistant cultivation model in the northwest arid area of China in recent years. For further integration agronomic requirement of cultivation pattern of double width filming and covering soil on double ridges and improving the level of mechanization construction performance and efficiency of seedbed, a combined operation machine for double width filming and covering soil on double ridges was designed, which synchronously realized institutional operation once such as rotary tillage, ridging, fertilization, double width filming and covering soil and suppressing on double ridges. Based on the transmission route of combined operation machine, the key parts were designed and selected, and the operation parameters and power dissipation of rotary blades, fertilizing device and soil elevating-seedbed covering mechanism were determined. The operation process of scraper type soil lifting device and horizontal two-way spiral soil conveyer were analyzed, and the necessary work conditions to make sure that the covering soil on the all parts of double width filming seedbed were analyzed and calculated. The discrete element method was applied to simulate the device with soil elevating-seedbed covering mechanism dynamic operation process of soil elevating, transporting and covering. The characteristics of soil transporting and covering in each working link were analyzed, the related factors that affected the effect of covering soil were discussed. The field experimental results showed that under the condition of operation speed of 1.10 m/s, the mechanical damage degree of day lighting surface of plastic film was 39.8 mm/m2, the qualified rates of soil width covered on seedbed film edge was 94.5%, the qualified rates of soil width covered on center of large ridge was 91.6%, the qualified rates of soil depth covered on seedbed was 97.5% and the qualified rates of ridging height was 93.2%, which were up to the relevant work quality evaluation specification requirements, and the experimental results met the design requirements of combined operation machine. The field test conditions was consistent with the simulation result. The research results would provide an important reference for researching and developing the supporting agricultural machinery equipment which constructed seedbed of whole plastic-film mulching on double ridges in northwest arid area of China. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Soils
Controlled terms: Agricultural robots? - ?Arid regions? - ?Cultivation? - ?Drought? - ?Plastic films
Uncontrolled terms: Combined operations? - ?Construction performance? - ?Cultivation models? - ?Dynamic operations? - ?Mechanical damages? - ?Operation parameters? - ?Plastic film mulching? - ?Specification requirement
Classification code: 443 Meteorology? - ?444 Water Resources? - ?483.1 Soils and Soil Mechanics? - ?817.1 Polymer Products? - ?821.3 Agricultural Methods
Numerical data indexing: Percentage 9.16e+01%, Percentage 9.32e+01%, Percentage 9.45e+01%, Percentage 9.75e+01%, Velocity 1.10e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.05.011
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
12. Construction and Application of Multi-factor Cultivated Land Health Productivity Evaluation System
Accession number: 20202508853777
Title of translation:
Authors: Gao, Lulu (1); Zhang, Chao (1, 2); Lü, Yahui (1); Chen, Wanling (1); Yun, Wenju (2, 3); Ma, Jiani (1)
Author affiliation: (1) College of Land Science and Technology, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Agricultural Land Quality Monitoring and Control, Ministry of Natural Resources, Beijing; 100083, China; (3) Land Consolidation and Rehabilitation Center, Ministry of Natural Resources, Beijing; 100035, China
Corresponding author: Zhang, Chao(zhangchaobj@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 215-222
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to strengthen the protection of quantity, quality and ecology of arable land, it is necessary to grasp the situation of farmland comprehensively. From the perspective of cultivated land and its surrounding ecosystem, the framework of cultivated land health productivity was constructed as “demand-function-dimension-element-index”, which included two dimensions of cultivated land productivity and cultivated land health, and five dimensions of climatic conditions, soil characteristics, utilization status, environmental stress status and beneficial ecological status. Then, according to the characteristics of the study area, the evaluation index system of cultivated land health productivity was established. At the same time, the key indicators such as vegetation coverage and biodiversity were obtained by using domestic GF-1 remote sensing data, and the healthy productivity of cultivated land was evaluated objectively. Finally, Da’an City, Jilin Province, in the Songnen Plain of China, was selected as the research area to carry out case studies. The results showed that in Da’an City, totally 40.35% and 52.07% of the total cultivated land were health-superior and health-inferior cultivated lands, respectively, while 7.58% was sub-health-superior and sub-health-inferior cultivated land. The health status of cultivated land was generally good, and the productivity of cultivated land was relatively low; the healthy productivity of cultivated land was mainly affected by the utilization and beneficial ecological conditions, and the influence of soil characteristics was the second. The evaluation system of farmland health productivity was an extension of the existing evaluation methods of cultivated land, which can provide scientific support for rational utilization and sustainable development of cultivated land. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Land use
Controlled terms: Biodiversity? - ?Ecology? - ?Farms? - ?Functions? - ?Health? - ?Productivity? - ?Remote sensing? - ?Soil surveys? - ?Sustainable development
Uncontrolled terms: Climatic conditions? - ?Ecological conditions? - ?Environmental stress? - ?Evaluation index system? - ?Productivity evaluation? - ?Remote sensing data? - ?Soil characteristics? - ?Vegetation coverage
Classification code: 403 Urban and Regional Planning and Development? - ?454 Environmental Engineering? - ?454.3 Ecology and Ecosystems? - ?461.6 Medicine and Pharmacology? - ?483.1 Soils and Soil Mechanics? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?921 Mathematics
Numerical data indexing: Percentage 4.04e+01%, Percentage 5.21e+01%, Percentage 7.58e+00%
DOI: 10.6041/j.issn.1000-1298.2020.05.024
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
13. Design and Experiments of Rotating Tray Microwave Vacuum Dryer
Accession number: 20202508854054
Title of translation:
Authors: Dai, Jianwu (1); Yang, Shenglin (1); Xie, Yuceng (2); Wang, Jie (1); Wen, Mengda (1); Ren, Ling (1)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya’an; 625014, China; (2) College of Biological System Engineering, Washington State University, Pullman; WA; 99163, United States
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 370-376
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A rotating tray microwave vacuum (RTMV) dryer was designed to solve the problems of uneven heating of materials, difficult control of hot spots and poor dried quality. The machine was composed of drying box, control system, vacuum system, transmission system, water circulation system and heating system. In order to make the material heating uniformly, the main axis with five evenly distributed rotating bracket was placed into the microwave vacuum drying chamber and driven by a stepper motor. During the drying process, the material was rotated constantly around the main axis with a horizontal level. The vacuum system can remove the moisture evaporated from the material in time during the vacuuming process. The combination of dryer and water circulation system ensured the normal operation of vacuum pump, so as to maintain the vacuum pressure of drying chamber consistently. The control system can be divided into five modules: the main control, A/D conversion, expansion, output control and display screen. The system took the P89V51RD2FN chip as the core to control the coordination of each module, which can adjust the drying pressure in the drying room between vacuum and normal pressure precisely. The papaya was used as the material for the performance test and compared with the traditional microwave drying method. The results showed that the carrying capacity of the dryer was increased by 80% compared with the latter. And the drying time was shortened by 43.8% at the same time. The unit energy consumption of papaya slices treated by RTMV dryer was about 29.8% lower than that by the conventional way. And the dehydration uniformity reached up to 97% with consistent color distribution between inner and outer of the dried sample, showing good drying uniformity of RTMV drying technology. The designed dryer ensured the uniform heating of materials, improved the drying efficiency and guaranteed the drying quality of materials, which provided a reference for the subsequent application. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Quality control
Controlled terms: Analog to digital conversion? - ?Control systems? - ?Dryers (equipment)? - ?Drying? - ?Energy utilization? - ?Microwave heating? - ?Microwaves? - ?Stepping motors? - ?Vacuum applications
Uncontrolled terms: Color distribution? - ?Drying efficiency? - ?Drying technology? - ?Microwave - vacuum drying? - ?Normal operations? - ?Performance tests? - ?Transmission systems? - ?Water circulation system
Classification code: 525.3 Energy Utilization? - ?633.1 Vacuum Applications? - ?705.3 Electric Motors? - ?711 Electromagnetic Waves? - ?711.1 Electromagnetic Waves in Different Media? - ?731.1 Control Systems? - ?913.3 Quality Assurance and Control
Numerical data indexing: Percentage 2.98e+01%, Percentage 4.38e+01%, Percentage 8.00e+01%, Percentage 9.70e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.041
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
14. Research Progress of Image Sensing and Deep Learning in Agriculture
Accession number: 20202508853492
Title of translation:
Authors: Sun, Hong (1); Li, Song (1); Li, Minzan (1); Liu, Haojie (1); Qiao, Lang (1); Zhang, Yao (2)
Author affiliation: (1) Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing; 100083, China
Corresponding author: Li, Minzan(limz@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 1-17
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Accurate data sensing and processing are basic of quantitative decision-making in smart agriculture management. Image sensing provide multi-dimensional information for agriculture detection, such as color, visible-near infrared spectroscopy, 3D and thermal radiation. The traditional way to analyze these images focuses on the characteristics of color, morphology, texture, spectral reflection and so on. The limitations of sample mounts and extracted features always lead to the problems such as insufficient noise reduction and low accuracy of the recognition and detection models, especially for complex background changes and unknown samples. Deep learning (DL), a subset of machine learning approaches, emerged and combined neural networks to extract and represent the high-level features of image. It provided a versatile tool to assimilate and explore distribution and features from heterogeneous data. It could help to build reliable predictions of complex and uncertain phenomena in agriculture. In order to explain the application potential and further direction, the applied sensors, specific models and dataset sources were examined from five areas, including plant recognition and detection, disease and pest identification, remote sensing classification and monitoring, products detection and grading, and animal detection. Finally, several avenues of researches were outlined. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 142
Main heading: Deep learning
Controlled terms: Agricultural robots? - ?Agriculture? - ?Chemical detection? - ?Classification (of information)? - ?Complex networks? - ?Data handling? - ?Decision making? - ?Grading? - ?Infrared devices? - ?Near infrared spectroscopy ? - ?Noise abatement? - ?Remote sensing? - ?Textures
Uncontrolled terms: Combined neural networks? - ?High-level features? - ?Machine learning approaches? - ?Quantitative decision? - ?Remote sensing classification? - ?Smart agricultures? - ?Spectral reflection? - ?Visible-near infrared spectroscopy
Classification code: 716.1 Information Theory and Signal Processing? - ?722 Computer Systems and Equipment? - ?723.2 Data Processing and Image Processing? - ?751.4 Acoustic Noise? - ?801 Chemistry? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?912.2 Management
DOI: 10.6041/j.issn.1000-1298.2020.05.001
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
15. Design and Experiment of Drum-type Hot Air Re-dryer for Tea
Accession number: 20202508853462
Title of translation:
Authors: Zhang, Kaixing (1); Wang, Wenzhong (1); Zhao, Xiuyan (2); Liu, Xianxi (1, 3)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) College of Information Science and Engineering, Shandong Agricultural University, Tai’an; 271018, China; (3) Shandong Provincial Engineering Laboratory of Agricultural Equipment Intelligence, Tai’an; 271018, China
Corresponding author: Liu, Xianxi(wjbliu@sdau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 377-386
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the problems of low heat energy utilization rate, uneven heating of tea and low productivity, etc., in order to improve the quality and yield of tea processing, a drum-type tea hot air re-dryer machine was designed. The basic structure and working principle of the dryer were explained, and the key components were analyzed theoretically. The key design parameters such as the drum speed, installation angle of roller, and hot air control cabinet were determined. The CFD-DEM coupling simulation method was used to analyze the separation ratio and temperature change of tea particles in the barrel at different rotation speeds of the drum. It was found that when the rotation speed of the drum was 15 r/min, the tea particles separation ratio and temperature were changed optimally, and the re-dryer effect reached the optimum. Based on the design and simulation experiments, a set of traditional tumbler tea dryers were designed to be compared with the designed re-dryer. The test results showed that when the average speed of the drum was 15 r/min, the average working temperature was 130, when three fresh leaves were used as raw materials, the productivity, moisture content, tea break rate, power consumption rate, and effective working temperature of the re-dryer were 65 kg/h, 3.5%, 0.8%, 0.6 kW?h/kg and 130, respectively. At 130, the tea leaves processed by the re-dryer machine can reach the super-standard standards, and each index was better than that of traditional machines, which met the working requirements of the re-dryer machine. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Dryers (equipment)
Controlled terms: Energy utilization? - ?Productivity? - ?Tea
Uncontrolled terms: Coupling simulation? - ?Design and simulation? - ?Installation angle? - ?Key design parameters? - ?Particles separation? - ?Power consumption rates? - ?Temperature changes? - ?Working temperatures
Classification code: 525.3 Energy Utilization
Numerical data indexing: Mass_Flow_Rate 1.81e-02kg/s, Percentage 3.50e+00%, Percentage 8.00e-01%, Rotational_Speed 1.50e+01RPM
DOI: 10.6041/j.issn.1000-1298.2020.05.042
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
16. Quantitative Analysis of Oula Lamb Meat Volatile Compounds Based on Fingerprint
Accession number: 20202508853800
Title of translation:
Authors: Chen, Xuemin (1); Zhu, Guoyin (1); Luo, Hailing (2, 3); Yu, Zhongxiang (4); Luo, Jie (5); Zhang, Hao (1, 6)
Author affiliation: (1) College of Food Science and Nutritional Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Animal Science and Technology, China Agricultural University, Beijing; 100193, China; (3) State Key Laboratory of Animal Nutrition, China Agricultural University, Beijing; 100193, China; (4) Academy of Animal and Veterinary Science, Qinghai University, Xining; 810016, China; (5) College of Food Science and Technology, Hunan Agricultural University, Changsha; 410128, China; (6) Beijing Advanced Innovation Center for Food Nutrition and Human Health, China Agricultural University, Beijing; 100083, China
Corresponding author: Zhang, Hao(zhanghaocau@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 349-355
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Distributed in the eastern Qinghai-Tibet plateau where the environmental condition is unique, Oula lamb is of distinction owing to the quality of its meat. Aiming to establish the fingerprint of volatile flavor for Oula lamb meat. The lamb meat was obtained from four kinds of lamb: Oula lamb, Hu lamb, Dorper lamb and Tan lamb. Extraction and analysis of the volatile compounds were carried out by headspace solid-phase microextraction and gas chromatography-mass spectrometry respectively. At the same time, gas chromatography-olfactometry was used to assess the fragrant compounds. Principal component analysis and cluster analysis were applied to determine the chemical variability among four kinds of lamb meat. The results showed that 53 volatile components of Oula lamb meat were identified and quantified, including aldehydes, heterocycles, hydrocarbons, alcohols and ketones, among which 77% possessed perceptible aromas. Totally 20 kinds of aldehydes with their content accounting for 62% contributed the most to flavor. Grouping of samples highlighted a good classification of the results, providing a significant separation between Oula lamb meat and other three kinds of lamb meat. Characteristic flavor compounds of Oula lamb meat mainly included (E)-2-hexenal, (E, E)-2, 4-heptadienal, (E, E)-2, 4-octadienal, 3-octen-2-one and other unsaturated aldehydes and ketones, together with some hydrocarbons, such as p-cymene, and other flavor compounds such as benzothiazole, providing fruits, nuts and grass odors. The findings provided the volatile fingerprint of Oula lamb meat, which can promote the development of related products of Oula lamb. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Gas chromatography
Controlled terms: Aldehydes? - ?Cluster analysis? - ?Drug products? - ?Essential oils? - ?Flavor compounds? - ?Hydrocarbons? - ?Ketones? - ?Mass spectrometry? - ?Meats? - ?Odors ? - ?Principal component analysis? - ?Unsaturated compounds? - ?Volatile organic compounds
Uncontrolled terms: Chemical variability? - ?Environmental conditions? - ?Gas chromatography olfactometries? - ?Head-space solid-phase microextraction? - ?Qinghai Tibet plateau? - ?Unsaturated aldehydes? - ?Volatile components? - ?Volatile compounds
Classification code: 723 Computer Software, Data Handling and Applications? - ?801 Chemistry? - ?802.3 Chemical Operations? - ?804.1 Organic Compounds? - ?822.3 Food Products? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 6.20e+01%, Percentage 7.70e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.038
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
17. Design and Test of Cylinder Screen Oat Cleaning Device with Arc Grid Sieves and Re-cleaning
Accession number: 20202508853506
Title of translation:
Authors: Li, Xinping (1); Zhao, Gaoyuan (1); Ji, Jiangtao (1); Wang, Wenzhe (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: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 124-133
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to reduce the problem of low cleaning performance of oats cleaning device, the structure of single fan three cylinder screen cleaning device was improved according to the physical characteristics of oats, and a cylinder screen oats cleaning device with arc grid screen re-cleaning was designed. A skip plate structure was installed on the large cylinder screen, which can make the material jump up and fully separate. The arc grid baffle screen and re-cleaning parts was designed and installed to reduce the impurity content and the entrainment loss. Based on the performance parameters of traditional single fan three cylinder screen cleaning device, the cleaning principle and function of skip plate of large cylinder screen and arc grid baffle screen was analyzed theoretically. Taking the rotating speed of centrifugal fan, the rotating speed of large cylinder screen and the angle of arc grid baffle screen as the experimental factors, and the impurity content and loss rate of oat grain as the experimental indexes, the indoor ternary quadratic orthogonal rotation combined test was carried out. The results showed that when the rotating speed of centrifugal fan was 1 500 r/min, the rotating speed of large cylinder screen was 110 r/min, and the angle of the arc grid baffle screen was 41°, the cleaning effect of the device was the best, the impurity content rate was 1.96%, and the loss rate was 2.64%. A field test was carried out. Under the optimum parameters, the impurity content rate was 1.97%, and the loss rate was 2.68%, which provided a reference for the optimization of the structure of the oat cleaning device and the improvement of the whole structure of oat combine harvester. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Cleaning
Controlled terms: Cylinders (shapes)? - ?Fans? - ?Plates (structural components)? - ?Rotating machinery? - ?Structural optimization
Uncontrolled terms: Centrifugal fans? - ?Cleaning devices? - ?Combine harvesters? - ?Experimental factors? - ?Optimum parameters? - ?Performance parameters? - ?Physical characteristics? - ?Quadratic orthogonal rotation
Classification code: 408.2 Structural Members and Shapes? - ?601.1 Mechanical Devices? - ?618.3 Blowers and Fans? - ?802.3 Chemical Operations? - ?921.5 Optimization Techniques
Numerical data indexing: Percentage 1.96e+00%, Percentage 1.97e+00%, Percentage 2.64e+00%, Percentage 2.68e+00%, Rotational_Speed 1.10e+02RPM, Rotational_Speed 1.50e+03RPM
DOI: 10.6041/j.issn.1000-1298.2020.05.013
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
18. Analysis Method and Experiments of Inline Mixing Water Dispersible Granules Pesticides Based on 3D Image Reconstruction
Accession number: 20202508854038
Title of translation: 3D
Authors: Dai, Xiang (1); Xu, Youlin (1); Zheng, Jiaqiang (1); Ma, Luqiang (1); Ding, Fengjuan (1); Guo, Changhao (1)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing; 210037, 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: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 98-107
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The image-based approach used to evaluate inline mixing efficacy for the pesticides mixers has advantages of not disturbing flow fields and achieving convenient and quick uniformity evaluation. Inline mixing tests for a jet mixer were carried out by using plastic particles to simulate water dispersible granules (WDG) pesticides. Distribution of particles flowing in the detectable region of the mixer was collected with the help of a high-speed camera and a total reflection prism to receive images from both horizontal and vertical viewing directions. For the acquired images, the particle images were pre-processed based on the morphological method, and segmented by the iterative thresholding method. Then, the particle center of gravity coordinates and normalized moment of inertia (I) parameters were extracted from each image in two viewing directions. The particle matching and 3D reconstruction based on the multi-viewing images were realized according to the consistency of the corresponding particle abscissa. The method for calculating the uniformity of the particle spatial distribution was proposed. Furthermore, according to the reconstructed three-dimensional images, the matching of the particles between frames was completed, and the calculation method to obtain the particle velocity distribution and measure the performance of the mixer was proposed. The actual verification results of the four kinds of plastic particles used to simulate WDG of differing physical properties by the above method showed that the particles with lower sedimentation velocity (caused by small particle diameter and density similar to water) under the condition of horizontal placement of the mixer led to high mixing uniformity. Accordingly, they did not tend to have downward velocity vectors, which allowed the actual WDG to have uniform distribution after dispersing and dissolving, and sufficient mixing efficacy. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Image reconstruction
Controlled terms: Granulation? - ?High speed cameras? - ?Iterative methods? - ?Mixers (machinery)? - ?Mixing? - ?Pesticides? - ?Velocity control? - ?Velocity distribution
Uncontrolled terms: 3D image reconstruction? - ?Distribution of particles? - ?Particle spatial distribution? - ?Particle velocity distributions? - ?Sedimentation velocities? - ?Three dimensional images? - ?Water dispersible granule (WDG)? - ?Water-dispersible granules
Classification code: 731.3 Specific Variables Control? - ?742.2 Photographic Equipment? - ?802.3 Chemical Operations? - ?803 Chemical Agents and Basic Industrial Chemicals? - ?921.6 Numerical Methods? - ?922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2020.05.010
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
19. Temperature Eigenvalues Evaluation Method of Rice Canopy Thermal Image Induced by Brown Rice Planthopper
Accession number: 20202508853490
Title of translation:
Authors: Liu, Youfu (1, 2); Xiao, Deqin (3); Liu, Yalan (4); Zhong, Boping (1, 2); Zhou, Zhiyan (1, 2)
Author affiliation: (1) Guangdong Engineering Research Center for Agricultural Aviation Application (ERCAAA), South China Agricultural University, Guangzhou; 510642, China; (2) National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology (NPAAC), Guangzhou; 510642, China; (3) College of Mathematics and Informatics, South China Agricultural University, Guangzhou; 510642, China; (4) College of Natural Resources and Environment, South China Agricultural University, Guangzhou; 510642, China
Corresponding author: Zhou, Zhiyan(zyzhou@scau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 165-172
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The change of canopy statistical temperature eigenvalue is one of the important index for crop pest identification. However, with the effects of environmental temperature and humidity fluctuations, when canopy temperature is used directly in the time series for pest evaluation, the healthy plants must be set for comparison. Therefore, the method is not operable in practical production applications. In order to find an effective method for evaluating the canopy statistical temperature eigenvalues of rice plants after brown planthopper infestation, the brown planthopper susceptible rice variety “TN1” was taken as the object, and two treatments of brown planthopper infestation and non-infestation were set. The infrared canopy was used to obtain the canopy of rice. The temperature eigenvalues were evaluated by using a machine learning classifier to evaluate the temperature characteristics of rice canopy-induced thermal images of rice canopy. In data analysis, three canopy statistical temperature eigenvalues extracted from the thermal images were used, and the features that best reflected the differences were selected. The cumulative difference of the canopy temperature coefficient of variation was 30.78. And then, combined with air temperature, relative humidity and water temperature, the logistic regression and support vector machine were used to fit the evaluation model. For determining brown rice planthopper damage by the logistic regression algorithm, when three canopy statistical temperature eigenvalues were used as input vector, the accuracy of the logistic regression test set was 87.15%, the recall rate was 86.54%, and the F1-measure was 86.55%. Support vector machine algorithm test set accuracy rate was 86.74%, recall rate was 86.90%, and F1-measure was 86.53%. In practical applications, the statistical eigenvalue of the canopy thermal image of rice can be obtained by calculating the air temperature, relative humidity and water temperature information to evaluate whether the inversion showed the invasion of brown rice planthopper. It was of great significance for the health monitoring and diagnosis of rice. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Eigenvalues and eigenfunctions
Controlled terms: Animals? - ?Atmospheric temperature? - ?Learning systems? - ?Logistic regression? - ?Statistics? - ?Support vector machines? - ?Support vector regression? - ?Temperature distribution
Uncontrolled terms: Canopy temperature? - ?Environmental temperature? - ?Evaluation modeling? - ?Logistic regression algorithms? - ?Practical production? - ?Statistical temperature? - ?Support vector machine algorithm? - ?Temperature characteristic
Classification code: 443.1 Atmospheric Properties? - ?641.1 Thermodynamics? - ?723 Computer Software, Data Handling and Applications? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 8.65e+01%, Percentage 8.67e+01%, Percentage 8.69e+01%, Percentage 8.72e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.018
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
20. Temporal and Spatial Evolution Characteristics and Ecological Risk Assessment of Land Use Landscape Patterns in Central Zhejiang Urban Agglomeration
Accession number: 20202508853417
Title of translation:
Authors: Shi, Xiaowei (1, 2); Feng, Guangjing (2, 3); Yi, Yang (4); Zou, Yijiang (5); Ge, Haoran (6); Su, Peitian (7)
Author affiliation: (1) College of Economics and Management, Northeast Agricultural University, Harbin; 150030, China; (2) Land Economy and Natural Resources Management Research Center, Northeast Agricultural University, Harbin; 150030, China; (3) School of Public Administration and Law, Northeast Agricultural University, Harbin; 150030, China; (4) Department of Engineering, University of Tokyo, Tokyo; 113-8656, Japan; (5) Department of Geography and Spatial Information Technology, Ningbo University, Ningbo; 315211, China; (6) Business School, Ningbo University, Ningbo; 315211, China; (7) College of Economics and Management, Zhejiang A&F University, Hangzhou; 311300, China
Corresponding author: Feng, Guangjing(fenggj@139.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 242-251
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: As the carrier of regional urban development, land has been attached great importance to spatial planning and development policy. In order to explore the sustainable development mechanism of “land use-ecology” in the middle-eastern urban agglomerations in the southeast coast, taking the central Zhejiang urban agglomeration as an example, the FRAGSTATS was used to measure the landscape fragmentation index of the central Zhejiang urban agglomeration by analyzing the five remote sensing image data from 1996 to 2016, including the horizontal value of the key time nodes of landscape shape index and landscape diversity index, and the evolution characteristics of the comprehensive landscape structure of the land use in the study area; and then the land use ecology of the central Zhejiang urban agglomeration in different periods was analyzed through the ARCGIS evolution regional ecological risk spatial differentiation. It was found that from 1996 to 2016, the transfer situation between various types of land use was significantly enhanced. The area of construction land was increased by nearly three times; the proportion of forest land area showed a slow growth trend; the land area of water resources and water conservancy facilities was decreased from 5.85% to 3.89% in 2006-2016, with a large decline; the unused land was reduced by nearly 21a. The most common ratio was followed by cultivated land. The actual reduced area of cultivated land was more than that of unused land. In the field and grassland, it was mainly distributed in the northeast direction and northwest direction of the central Zhejiang urban agglomeration. The overall increase in grassland was generally reduced. Increased and reduced areas account for a small proportion of total land use area. The overall landscape pattern quality of land use in central Zhejiang urban agglomerations showed a trend of “first decline-then rise-overall decline”. The specific performance was as follows: from 1996 to 2016, the overall landscape fragmentation index was increased, and the local year was declined. The landscape shape index and landscape diversity index were decreased overall, and the local year was increased. The transfer of various types of land tended to be complex and volatile. Based on 2016 time node spatial evolution characteristics of the horizon to ecological risk analysis of middle of Zhejiang, the ecological risk index of Yiwu, Dongyang and Wuyi was between 0.69~0.82, for and level areas, ecological risk level was high or higher; the ecological risk index of Wu City, Jindong Area and Pujiang County was between 0.56~0.59, for level area, ecological risk was moderate; the ecological risk index of Lanxi City, Yongkang City, Zhuji City, Panan County, Longyou County and Jinyun County was below 0.49, for or level, ecological risk level was low or relatively low. From 1996 to 2016, the spatial risk of land use ecological risk grades in central Zhejiang urban agglomerations was quite different, and the spatial distribution showed the phenomenon of “convergence club” and “concentration-distribution”, that was, higher ecological risk. The area and high ecological risk area were spatially directed to the central part of the middle-middle urban agglomeration and there was a gathering situation; the lower ecological risk area and the low ecological risk area were spatially dispersed in the northwest, southeast and southwest areas of the Zhejiang city group. The research and judgment of the sustainable use of land in central Zhejiang urban agglomeration provided ideas and methods to promote the sustainable development of land use and ecological environment in central Zhejiang urban agglomerations. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Risk assessment
Controlled terms: Agglomeration? - ?Ecology? - ?Forestry? - ?Land use? - ?Planning? - ?Remote sensing? - ?Risk analysis? - ?Sustainable development? - ?Urban growth? - ?Water management
Uncontrolled terms: Concentration distributions? - ?Ecological environments? - ?Ecological risk assessment? - ?Evolution characteristics? - ?Landscape diversity indices? - ?Landscape fragmentation? - ?Spatial differentiation? - ?Temporal and spatial evolutions
Classification code: 403 Urban and Regional Planning and Development? - ?403.1 Urban Planning and Development? - ?454.3 Ecology and Ecosystems? - ?802.3 Chemical Operations? - ?912.2 Management? - ?914.1 Accidents and Accident Prevention? - ?922 Statistical Methods
Numerical data indexing: Percentage 5.85e+00% to 3.89e+00%
DOI: 10.6041/j.issn.1000-1298.2020.05.027
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
21. Irrigation Schedule of Microporous Infiltration Irrigation for Lingwu Jujube Based on Lower Limit of Soil Moisture
Accession number: 20202508853461
Title of translation:
Authors: Jiao, Bingzhong (1); Sun, Zhaojun (1, 2); El-Sawy, S.M. (3); Han, Lei (2, 4); He, Jun (2, 4); Zeng, Yuxia (1)
Author affiliation: (1) College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan; 750021, China; (2) Institute of Environmental Engineering, Ningxia University, Yinchuan; 750021, China; (3) Vegetable Research Department, Agricultural and Biological Division, National Research Centre, Cairo; 11435, Egypt; (4) China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Region, Ministry of Education, Yinchuan; 750021, China
Corresponding author: Sun, Zhaojun(sunzhaojunyx@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 305-314
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to find out the effect of lower limit of soil moisture control on microporous infiltration irrigation of Lingwuchangzao (Ziziphus jujuba Mill.cv. ‘Lingwuchangzao’) and the optimal irrigation amount in each growth period, the six-year-old Lingwuchangzao was used as the research object. Adopting the GC-003 Internet of Things control system and soil moisture sensor monitoring, six different treatments for different lower limits of soil moisture were set for the four growth periods of jujube trees. The relationship between the change of photosynthetic characteristics, and morphological indicators, water use efficiency, yield, water consumption law and irrigation water amount of jujube trees was studied. The results showed that the increase of lower soil water limit during flowering and fruiting bearing periods and during fruit expansion was beneficial to the photosynthesis of jujube trees; the decrease of lower water limit during sprouting and leaf spreading period and the increase of lower water limit during flowering and fruit bearing period were favorable for the growth of morphological indicators of jujube trees. T6 treatment, that was, the lower limits of soil moisture during sprouting and leaf spreading period was 65%θf(θf was field water holding capacity), and during flowering and fruiting bearing period was 75%θf, during fruit expansion was 75%θf, and during fruit maturation was 65%θf, the lower limit was higher in each growth period, which had significantly different photosynthetic characteristics and morphological indicators from other treatments (Pf, during flowering and fruiting period was 75%θf, during fruit expansion was 65%θf, and during fruit maturation was 65%θf)was the best, and there was no significant difference with the yield of T6 treatment(P>0.05). The yield of T6 treatment was only 5.68% (2018) and 0.90% (2019) higher than that of T3 treatment. Compared with T6 treatment, T3 treatment decreased the irrigation water volume by 22.57% (2018) and 13.59% (2019). The most suitable lower limit of irrigation water during the four growth periods of jujube were: during sprouting and leaf spreading period was 55% θf, during flowering and fruiting bearing period was 75%θf, during fruit expansion was 65%θf, and during fruit maturation was 65%θf, and all the upper limit were 90% θf. The study results can provide scientific basis for planting Ningxia Lingwuchangzao with microporous infiltration irrigation and water management. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Infiltration
Controlled terms: Efficiency? - ?Expansion? - ?Forestry? - ?Fruits? - ?Irrigation? - ?Microporosity? - ?Moisture control? - ?Soil moisture? - ?Water supply? - ?Water treatment
Uncontrolled terms: Different treatments? - ?Irrigation amounts? - ?Irrigation schedule? - ?Morphological indicator? - ?Photosynthetic characteristics? - ?Soil moisture sensors? - ?Water holding capacity? - ?Water use efficiency
Classification code: 445.1 Water Treatment Techniques? - ?446.1 Water Supply Systems? - ?483.1 Soils and Soil Mechanics? - ?731.3 Specific Variables Control? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?913.1 Production Engineering? - ?931.2 Physical Properties of Gases, Liquids and Solids? - ?951 Materials Science
Numerical data indexing: Percentage 5.50e+01%, Percentage 9.00e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.033
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
22. Emulsifying Properties and Antioxidant Activities of Black Kidney Bean Protein Modified by Chlorogenic Acid
Accession number: 20202508853507
Title of translation:
Authors: Li, Yang (1, 2); Yan, Shizhang (1); Qi, Baokun (1, 2); Zhang, Shuang (1); Xie, Fengying (1)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China; (2) National Research Center of Soybean Engineering and Technology, Harbin; 150086, China
Corresponding author: Xie, Fengying(spxfy@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 356-362
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to investigate the effects of covalent interaction of black kidney bean protein isolate (BKPI) and different concentrations of chlorogenic acid (CA) on the function of the protein, the effects of the covalent interaction of BKPI and different concentrations of CA on protein structure were studied. The relationship between structural change and the functional properties of the complexes was analyzed through dynamic light scattering, fluorescence spectroscopy and Fourier transform infrared (FT-IR) spectroscopy. The results showed that the turbidity and the bonding content of CA in the complexes were increased, and its content of free amino group was decreased with the increase of CA concentration, the covalent interaction made the distribution of droplets in the solution more uniform. The secondary structure of BKPI was changed and the contents of α-helix and unordered decreased, while the contents of β-sheet were increased, and resulting in its conformational change. The decrease in fluorescence intensity with the increase of CA concentration, indicating the unfolding of the protein structure. The addition of CA improved the antioxidant activities and emulsification properties of BKPI. When the concentration of CA was 0.25 g/(100 mL), the antioxidant activities (168.95 μmol/g) and emulsifying properties of BKPI were the best. These results suggested that CA-BKPI complexes could be used as efficient antioxidants and potential emulsifiers in emulsion-food systems. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Structural properties
Controlled terms: Antioxidants? - ?Emulsification? - ?Fluorescence? - ?Fluorescence spectroscopy? - ?Fourier transform infrared spectroscopy? - ?Light scattering? - ?Proteins
Uncontrolled terms: Anti-oxidant activities? - ?Conformational change? - ?Covalent interactions? - ?Emulsification properties? - ?Fluorescence intensities? - ?Fourier transform infra red (FTIR) spectroscopy? - ?Functional properties? - ?Secondary structures
Classification code: 408 Structural Design? - ?741.1 Light/Optics? - ?741.3 Optical Devices and Systems? - ?801 Chemistry? - ?802.3 Chemical Operations? - ?804.1 Organic Compounds? - ?951 Materials Science
Numerical data indexing: Molality 1.69e-01mol/kg, Volume 1.00e-04m3
DOI: 10.6041/j.issn.1000-1298.2020.05.039
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
23. Zoning and Consolidation Strategy of Rural Residential Areas Guiding by Planning Regulation in Lijin County
Accession number: 20202508853466
Title of translation:
Authors: Yang, Xuhong (1); Wu, Xiaoli (2); Fan, Yuan (3); Han, Xiuye (4); Zhang, Suning (4); Jin, Xiaobin (1)
Author affiliation: (1) School of Geography and Ocean Science, Nanjing University, Nanjing; 210023, China; (2) Shanghai Tongji Urban Planning and Design Institute Co., Ltd., Shanghai; 200092, China; (3) Chinese Academy of Urban Planning and Design, Beijing; 100044, China; (4) Natural Resources Bureau in Lijin County, Lijin; 257400, China
Corresponding author: Jin, Xiaobin(jinxb@nju.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 232-241 and 323
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The spatial pattern optimization and land consolidation of rural settlement is of great significance to carry forward rural revitalization by zoning and classification based on scientific recognition of suitable development types for various village. The rational spatial layout optimization of rural settlements can promote the intensive use of land resources and improve rural production and living environment, and while activate the idle land resource in rural and coordinate the rural and urban development. In order to scientifically divide the types of rural settlement, taking Lijin County as an example, a comprehensive zoning system was put forward, which firstly zoned the whole rural settlement into three different evolution direction regions, and then classified the former results into different types of rural settlement guiding the future land consolidation under the planning regulation which reflected the impact of planning and the urban core area on the future development of the countryside. That following steps were in process: first of all, considering planning constraints of urban developing boundary and historical cultural conservation planning, the rural settlement was divided into three different evolution direction regions which was urbanization, historical cultural conservation zone and general rural region. The rural settlement located in the urbanization or conservation zone were identified as urban-rural integration village (URIV) and historical and cultural village (HCV), respectively. Then, a comprehensive evaluation index system was established in five dimensions of resources, population, economic conditions, infrastructure and location environment for the general rural region. Among the index system, the entropy weight method was applied to assign the weight of indictors, and the Ward hierarchical clustering was used for classifying the general rural region into different types on the basis of similarity or diversity: cluster developing village (CDV), keeping and limiting village (KLV) and dismantling and consolidate village (DCV). Finally, according to the evolution direction and resource condition of rural settlements, the land consolidation strategy of different rural classifications was put forward for rural revitalization and improvement of living environment. The results showed that thinking of the first zoning and then classification for the whole rural settlements was more scientific and reliable for classifying the different type of rural settlement, which can effectively implement regulation and guiding for the rural developing under the control of the urban developing boundary and historical cultural conservation planning. Compared with the traditional zoning method, the Ward hierarchical clustering method system can efficiently reflex the similarity among regions and diversity between the different zoning to the full extent, which can be superior to the all indictor comprehensive evaluation. The total rural settlement in Lijin County can be divided into five different types, which was urban-rural integration village (107 villages), historical and cultural village (6 villages), cluster developing village (21 villages), keeping and limiting village (180 villages) and dismantling and consolidate village (198 villages), and then a more specific strategy of land consolidation was put forward from the aspects of infrastructure, land reclamation, social security and environmental improvement. The framework of spatial pattern optimization and land consolidation of rural settlement can provide a new idea and method for the rural revitalization practice, building the beautiful countryside and improving the living environment in regional scale. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 40
Main heading: Rural areas
Controlled terms: Conservation? - ?Economic and social effects? - ?Hierarchical clustering? - ?Land reclamation? - ?Land use? - ?Natural resources? - ?Urban growth? - ?Zoning
Uncontrolled terms: Comprehensive evaluation? - ?Comprehensive evaluation index system? - ?Environmental improvements? - ?Hierarchical clustering methods? - ?Intensive use of lands? - ?Rural residential areas? - ?Spatial layout optimizations? - ?Urban-rural integrations
Classification code: 403 Urban and Regional Planning and Development? - ?403.1 Urban Planning and Development? - ?442.2 Land Reclamation? - ?971 Social Sciences
DOI: 10.6041/j.issn.1000-1298.2020.05.026
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
24. Design of Non-fragile Damping Controller for Stay Cable-Magnetorheological Damper
Accession number: 20202508853407
Title of translation: -
Authors: Feng, Zhimin (1); Shi, Yunfei (1); Zhang, Gang (1); Liu, Xiaofeng (1); Duan, Yuhe (2)
Author affiliation: (1) Faculty of Maritime and Transportation, Ningbo University, Ningbo; 315211, China; (2) Nanjing Rice Electronic Equipment Co., Ltd., Nanjing; 210014, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 411-420
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at suppressing the amplitude and time of oscillation, the uncertainties of the disturbance of unknown external disturbances of the stay cable-magnetorheological damper control system and uncertainties in the parameters of the damping controller. Based on linear matrix inequality (LMI) theory, the H∞ performance index and non-fragile control were used to suppress external disturbances and closed-loop system parameter perturbation problems, respectively. Regional pole configuration was used to characterize the fastness and stability of vibration reduction control, and variance was used to represent small amplitude and vibration speed. The LMI toolbox in Matlab was used to solve the convex optimization problem with multiple LMI constraints and linear objective functions, and a non-fragile vibration damping controller design form with multiple performance index constraints was given. Finally, the cable-stayed cables C22 and C13 of a cross-sea bridge in Zhejiang Province were taken as an example for simulation verification, and the vibration reduction effects were analyzed and compared. The results showed that the vibration damping controller designed by this method not only had good immunity and stability under different random disturbances, but also could reduce the amplitudes of different cable vibration states by 57.805% and 74.395%, the reduction of convergence time was 56.705% and 77.845%, and the vibration reduction effect was better, which could meet the needs of marine engineering applications. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Controllers
Controlled terms: Bridge cables? - ?Cable stayed bridges? - ?Closed loop systems? - ?Convex optimization? - ?Damping? - ?Linear matrix inequalities? - ?Marine applications? - ?Marine engineering? - ?MATLAB? - ?Vibration analysis
Uncontrolled terms: Convex optimization problems? - ?Engineering applications? - ?Linear objective functions? - ?Magneto-rheological dampers? - ?Parameter perturbation? - ?Simulation verification? - ?Stability of vibrations? - ?Vibration reduction effects
Classification code: 401.1 Bridges? - ?675 Marine Engineering? - ?732.1 Control Equipment? - ?921 Mathematics? - ?921.1 Algebra? - ?931.1 Mechanics? - ?961 Systems Science
Numerical data indexing: Percentage 5.67e+01%, Percentage 5.78e+01%, Percentage 7.44e+01%, Percentage 7.78e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.046
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
25. Influence of Agricultural Machinery Purchase Subsidies on Farmers’ Purchase Behavior
Accession number: 20202508853463
Title of translation:
Authors: Wang, Wenxin (1); Xu, Yun (2); Wang, Zhengda (3)
Author affiliation: (1) College of Economics and Management, China Agricultural University, Beijing; 100083, China; (2) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (3) International College Beijing, China Agricultural University, Beijing; 100083, China
Corresponding author: Xu, Yun(sdxuyun@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 151-155
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on the survey data of agricultural machinery purchase of small and medium-sized farmers in Weifang, Shandong Province in 2006 and 2018, respectively, the influence of different periods of agricultural machinery purchase subsidies, characteristics of agricultural machinery purchase decision makers and family characteristics on farmers’ purchase intention was calculated by using Logit model. The results showed that with the passage of time, the purchasing behavior of agricultural machinery tended to be rational, and the efficiency of agricultural machinery purchase subsidy was greatly reduced. Keeping other conditions unchanged, the purchase subsidy of agricultural machinery increased by 1%, the probability ratio of farmers’ purchase was increased by 9.04% in 2006, and decreased to 2.27% in 2018; the income of farmers increased by 1%, the probability ratio of purchasing machines was increased by 0.46% in 2006, and decreased to 0.13% in 2018; the income of farmers’ planting industry increased by 1%, the probability ratio of farmers’ purchase was increased by 0.29% in 2006, and decreased to 0.08% in 2018; the cultivated land area of farmers increased by 1%, the probability ratio of purchasing machines was increased by 0.33% in 2006, and decreased to 0.02% in 2018. According to the calculation results, some policy suggestions were put forward, such as meeting the needs of farmers, improving the efficiency of subsidies, increasing the types of subsidies, and reasonably determining the amount of subsidies. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Agriculture
Controlled terms: Agricultural machinery? - ?Agricultural robots? - ?Decision making? - ?Efficiency? - ?Logistic regression? - ?Probability? - ?Purchasing? - ?Sales
Uncontrolled terms: Calculation results? - ?Cultivated lands? - ?Policy suggestions? - ?Probability ratio? - ?Purchase decision? - ?Purchase intention? - ?Purchasing behaviors? - ?Shandong province
Classification code: 821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?821.1 Agricultural Machinery and Equipment? - ?912.2 Management? - ?913.1 Production Engineering? - ?922.1 Probability Theory
Numerical data indexing: Percentage 1.00e+00%, Percentage 1.30e-01%, Percentage 2.00e-02%, Percentage 2.27e+00%, Percentage 2.90e-01%, Percentage 3.30e-01%, Percentage 4.60e-01%, Percentage 8.00e-02%, Percentage 9.04e+00%
DOI: 10.6041/j.issn.1000-1298.2020.05.016
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
26. Remote Sensing Estimation of Rice Chlorophyll Content Based on PROSAIL Model Deviation Compensation
Accession number: 20202508853476
Title of translation: PROSAIL
Authors: Liu, Tan (1, 2); Xu, Tongyu (1, 2); Yu, Fenghua (1, 2); Yuan, Qingyun (1); Guo, Zhonghui (1, 2); Wang, Yonggang (1)
Author affiliation: (1) College of Information and Electrical Engineering, Shenyang Agricultural University, Shenyang; 110866, China; (2) Liaoning Engineering Research Center for Information Technology in Agriculture, Shenyang; 110866, China
Corresponding author: Xu, Tongyu(yatongmu@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 156-164
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Accurate estimation of crop chlorophyll content using spectral information is an important part of field crop growth assessment and the basis for precise fertilization and scientific management of crops. The rice in Northeast China was taken as the research object, a new hybrid modeling method was proposed to improve the accuracy of chlorophyll estimation and model interpretability. Firstly, based on the PROSAIL model, the canopy spectra of rice was simulated, and a lookup table for chlorophyll content was established to initially inversion chlorophyll content. Then the least squares support vector machine (LSSVM) method was used to establish the error model to compensate the PROSAIL output deviation, which can compensate for the error caused by PROSAIL modeling. To verify the proposed model’s ability to estimate, totally 13 vegetation indices that were more closely related to crop chlorophyll was selected, and then the four optimal vegetation indices were screened out through the simulation analysis of different statistical models, and the optimal prediction model for single factor input was established, including power model for GNDVI, RSI, (SDr-SDb)/(SDr+SDb), exponent model for MCARI. In addition, combined with the four vegetation indexes as input, the multi-factor prediction model of rice chlorophyll content was constructed by using partial least square method (PLS), LSSVM, BP neural network and the proposed hybrid modeling method, and the predictive model was estimated and verified. The results showed that the hybrid model had a large advantage and a low prediction bias than the optimal prediction model with single factor input. The R2 of modeling set was 0.740 6, the root mean square error (RMSE) was 0.985 2 mg/dm2; and the R2 of verification model was 0.733 2, RMSE was 1.084 3 mg/dm2. Compared with other multi-factor prediction models, the proposed method also had certain advantages, with high estimation accuracy and good robustness. In addition, the hybrid modeling method was based on the PROSAIL model, which the physical meaning was clear and the interpretability of the prediction model was improved. Therefore, the proposed modeling method can provide ideas and methods for chlorophyll content inversion, and provide reference for the diagnosis of rice nitrogen and monitoring of rice growth. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 34
Main heading: Least squares approximations
Controlled terms: Chlorophyll? - ?Crops? - ?Errors? - ?Forecasting? - ?Mean square error? - ?Neural networks? - ?Remote sensing? - ?Support vector machines? - ?Table lookup? - ?Two phase flow ? - ?Vegetation
Uncontrolled terms: Chlorophyll contents? - ?Hybrid modeling methods? - ?Least squares support vector machines? - ?Partial least square methods? - ?Remote sensing estimations? - ?Root mean square errors? - ?Scientific management? - ?Spectral information
Classification code: 631.1 Fluid Flow, General? - ?723 Computer Software, Data Handling and Applications? - ?723.1 Computer Programming? - ?804.1 Organic Compounds? - ?821.4 Agricultural Products? - ?921.6 Numerical Methods? - ?922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2020.05.017
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
27. Optimization and Experiment of Pneumatic Seed Metering Device with Guided Assistant Filling Based on EDEM-CFD
Accession number: 20202508853447
Title of translation: DEM-CFD
Authors: Shi, Song (1); Liu, Hu (1); Wei, Guojian (1); Zhou, Jilei (1); Jian, Shichun (1); Zhang, Rongfang (1)
Author affiliation: (1) Shandong Academy of Agricultural Machinery Sciences, Ji’nan; 250010, China
Corresponding author: Zhou, Jilei(zhoujilei@shandong.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 54-66
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: According to the declining seed quality of the air suction seed metering device guided with assistant seed-filling caused by high speed operation in the field, the design of the seed metering device was optimized. The structure parameters of seed plate to be optimized was defined by analyzing the factors of obstructions during seed filling process. According to the determinacy tracking model of the grain model, the gas-solid two-phase flow of the seed metering device was calculated by introducing the pressure gradient force model into coupled analysis of EDEM-CFD. Critical points of seed filling process in each stage was divided on the scales of macro and micro. The most suitable factors of seed filling state during each state were analyzed. Three factors quadratic rotation orthogonal combination tests were carried out with the index of the stable time during seed adsorption, the resistance during seed removing stage and the local void ratio at the hole, with the test factors of the Curvature coefficient of seed guide groove curve of seed plate, the depth of seed guide groove, the slope angle of seed guide groove. The optimal parameter combination of seed guide groove of seed metering plate was determined by multiple regression analysis of test results and multi-objective optimization method. The results were given as follows: the curvature coefficient of seed guide groove curve was 0.265, the depth of the seed guide groove was 2.57 mm, and the slope angle of seed guide groove was 15.33°. In order to verify the results of optimal design, the static tests were carried out on the bench of seed metering device, the indoor vibration environment simulation tests of the seed meter device were carried out according to the vibration signal of the seed meter collected from operating in the field. By comparing the optimized seed plate with original seed plate and the other two testing plates, the result showed that the optimized seed plate had a better performance at high speed and vibration conditions. The seed filling performance was more stable, and the miss rate was 1.26% when the operating speed was 14 km/h, the main excitation frequency of random vibration was 9.5 Hz, and the peak value of power spectral density was 0.428 (m/s2)2/Hz. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Vibrations (mechanical)
Controlled terms: Computational fluid dynamics? - ?Environmental testing? - ?Filling? - ?Multiobjective optimization? - ?Plates (structural components)? - ?Pneumatic materials handling equipment? - ?Regression analysis? - ?Spectral density? - ?Two phase flow
Uncontrolled terms: Excitation frequency? - ?Gas solid two phase flow? - ?High-speed operation? - ?Multiple regression analysis? - ?Optimal parameter combinations? - ?Pressure gradient force? - ?Seed metering devices? - ?Vibration environment
Classification code: 408.2 Structural Members and Shapes? - ?631.1 Fluid Flow, General? - ?691.1 Materials Handling Equipment? - ?691.2 Materials Handling Methods? - ?921.5 Optimization Techniques? - ?922.2 Mathematical Statistics? - ?931.1 Mechanics
Numerical data indexing: Frequency 9.50e+00Hz, Percentage 1.26e+00%, Size 2.57e-03m, Velocity 3.89e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.05.006
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
28. Rapid Design Method for Agricultural Machinery Based on Shape-distribution Model Retrieval
Accession number: 20202508853444
Title of translation:
Authors: Liu, Honghao (1); Zhang, Kaixing (1, 2); Lu, Shan (1); Liu, Xianxi (1, 3)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Engineering Laboratory of Agricultural Equipment Intelligence, Tai’an; 271018, China; (3) Shandong Provincial Key Laboratory of Horticultural Machineries and Equipments, Tai’an; 271018, China
Corresponding author: Zhang, Kaixing(kaixingzhang@139.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 395-403
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A new rapid design method for agricultural machinery was proposed to promote agricultural design reuse technology. The method was implemented based on shape distribution model retrieval. Firstly, the CAD models in agricultural database were normalized. According to mesh area, all the triangular meshes that belong to each model were divided into Max, Mid and Min groups. The Sobol quasi-random sequence was used to sample feature point from each group. Then three points were defined as the basic sample unit, which was used to fuse the D2, D3, C1 and A3 features together. The variation coefficient of each feature was calculated and the proportion was regarded as sub-feature weight of fusion feature. Thereafter, the multi-feature histogram of shape distribution was formed by connecting different weighted features. The χ2 distance was selected to measure the similarity between feature histograms. Finally, the effectiveness of the proposed method was proved with self-built agricultural model database using VS2010, Matlab 2016b and Open Cascade. The results showed that the retrieval precision of distance D2 feature was higher than that of curvature C1, angle A3 and area D3 features in agricultural model database. The proposed method of adaptive weighted shape distribution (AWSD) performed better than D2 when retrieval recall was ranged from 0 to 0.5, and as effective as D2 in the range of 0.5~1.0. Compared with D2 retrieval method, the comprehensive retrieval precision of AWSD method was increased by 8.5%. The retrieval cases of tractor wheel hub and harvester picking board demonstrated AWSD outperformance in the aspect of objective retrieval satisfaction. The new model retrieval method that could fuse multi-shape distribution features injected fresh energy to agricultural machinery rapid design. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Computer aided design
Controlled terms: Agricultural machinery? - ?Agricultural robots? - ?Agriculture? - ?Database systems? - ?Graphic methods? - ?Information retrieval? - ?Machine design
Uncontrolled terms: Fusion features? - ?Quasirandom sequences? - ?Retrieval methods? - ?Sample features? - ?Shape distribution? - ?Triangular meshes? - ?Variation coefficient? - ?Weighted features
Classification code: 601 Mechanical Design? - ?723.3 Database Systems? - ?723.5 Computer Applications? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?821.1 Agricultural Machinery and Equipment? - ?903.3 Information Retrieval and Use
Numerical data indexing: Percentage 8.50e+00%
DOI: 10.6041/j.issn.1000-1298.2020.05.044
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
29. Analysis and Comparison of Feed Rate Detection Methods of Combine Harvester Based on Power Detection
Accession number: 20202508853482
Title of translation:
Authors: Sun, Yifan (1); Liu, Renjie (1); Ou, Hao (2); Zhang, Zhenqian (1); Zhang, Man (1); Li, Han (2)
Author affiliation: (1) Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing; 100083, China
Corresponding author: Zhang, Man(cauzm@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 118-123
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Power measurement is one of the important methods for the detection of feed rate of combine harvester. In order to more accurately analyze the accuracy of the feed rate detection methods at different positions, two feed rate detection methods and devices were designed based on power of header driving shaft and power of tilting conveyor. Winter wheat in Hebei Province was used as the test object, and Xinjiang-3 harvester was used as a test platform and a system test was performed. The feeding amount detection system included a header active shaft torque sensor, a tilting conveyor power shaft torque sensor, a header active shaft speed sensor, and an on-board industrial computer. Through field experiments, two feed rate detection methods were analyzed and compared, and the calculation models were established based on the test data. The test results showed that the relative error of the method based on the power of driving shaft of cutting table was 19.6%, and the relative error of the method based on power of tilting conveyor was 16.1%. The detection accuracy of both methods can meet the needs of field application to a certain extent. The detection accuracy of feed quantity based on power of inclined conveyor was slightly higher than that based on power of driving shaft of cutting table. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Combines
Controlled terms: Belt conveyors? - ?Harvesters? - ?Testing? - ?Torque meters
Uncontrolled terms: Calculation models? - ?Combine harvesters? - ?Detection accuracy? - ?Detection system? - ?Field application? - ?Field experiment? - ?Industrial computers? - ?Power detection
Classification code: 692.1 Conveyors? - ?821.1 Agricultural Machinery and Equipment? - ?943.1 Mechanical Instruments
Numerical data indexing: Percentage 1.61e+01%, Percentage 1.96e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.012
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
30. Effects of Biological Organic Fertilizer and Yellow River Sediment Mixture on Water Consumption and Growth of Winter Wheat in Saline-Alkali Land
Accession number: 20202508853868
Title of translation:
Authors: Li, Xiaoshuang (1, 2); Dang, Hongkai (3); Song, Ni (1); Shen, Xiaojun (1); Gao, Yang (1); Sun, Jingsheng (1)
Author affiliation: (1) Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang; 453003, China; (2) Graduate School, Chinese Academy of Agricultural Sciences, Beijing; 100081, China; (3) Dryland Farming Institute, Hebei Academy of Agricultural and Forestry Sciences, Hengshui; 053000, China
Corresponding author: Sun, Jingsheng(jshsun623@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 272-284
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to analyze the effects of saline-alkali land improvement measures on water consumption and yield control of wheat under the condition of spring water limitation, and provide theoretical basis for promoting the increase of winter wheat yield and the improvement of water use efficiency in saline-alkali wheat areas. The positioning monitoring test was adopted in the three consecutive wheat growing seasons from 2015 to 2018. Four processing was set, respectively was with biological organic fertilizer (FF), mixed with Yellow River sediment (SS) and the biological organic fertilizer and Yellow River sediment mixed (SF), and CK treatment as control. The results showed that the annual yield was 3 317.77~5 449.52 kg/hm2 for three consecutive years, and SF treatment with Yellow River sediment and biological organic fertilizer had the highest grain yield. Compared with the control treatment, SF treatment increased the grain yield by 35%~51%. The variation amplitude of total water consumption was 352.85~394.89 mm, and the total water consumption between different treatments was the lowest in CK (352.85~386.17 mm). The water use efficiency of each treatment was 9.01~13.96 kg/(hm2?mm). SF (12.02~13.96 kg/(hm2?mm)) had the highest water use efficiency, which was higher than that of CK by 33%~48%, followed by FF (organic fertilizer) and SS (Yellow River sediment), which were respectively higher than that of control by 9%~32% and 9%~18%. Mixing Yellow River sediment (SS) or biological organic fertilizer mixing (FF) treatment can increase water storage in soil layer 0~200 cm before jointing, increase water consumption from jointing to maturity stage and its proportion in total water consumption, promote the utilization of water storage in soil and deep soil water of winter wheat, and finally improve biomass and grain yield of winter wheat. The grain yield of winter wheat was positively correlated with dry matter accumulation and grain number per panicle. WUE had a conic relation with water consumption and yield of winter wheat. With the increase of grain yield, WUE was increased rapidly. Under this research conditions, with the increase of water consumption, trend of WUE was different among different treatments. Taking yield, harvest index and water use efficiency into consideration, mixing Yellow River sediment and applying biological organic fertilizer (SF) was the best treatment under the conditions of this study. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 42
Main heading: Water treatment
Controlled terms: Crops? - ?Efficiency? - ?Fertilizers? - ?Grain (agricultural product)? - ?Groundwater? - ?Mixing? - ?Rivers? - ?Saline water? - ?Sediments? - ?Soil moisture ? - ?Water supply
Uncontrolled terms: Control treatments? - ?Different treatments? - ?Dry matter accumulation? - ?Land improvements? - ?Organic fertilizers? - ?Water consumption? - ?Water use efficiency? - ?Winter wheat yields
Classification code: 444 Water Resources? - ?444.2 Groundwater? - ?445.1 Water Treatment Techniques? - ?446.1 Water Supply Systems? - ?483 Soil Mechanics and Foundations? - ?483.1 Soils and Soil Mechanics? - ?802.3 Chemical Operations? - ?804 Chemical Products Generally? - ?821.4 Agricultural Products? - ?913.1 Production Engineering
Numerical data indexing: Size 0.00e+00m to 2.00e+00m, Size 3.53e-01m to 3.86e-01m, Size 3.53e-01m to 3.95e-01m
DOI: 10.6041/j.issn.1000-1298.2020.05.030
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
31. Experiment on Microwave Pyrolysis of Biomass Induced by Compound Absorber
Accession number: 20202508853869
Title of translation: TiC/SiC
Authors: Fan, Yongsheng (1); Hou, Guangxi (1); Xiong, Yonglian (1); Cai, Yixi (2); Zhao, Weidong (2)
Author affiliation: (1) School of Automotive Engineering, Yancheng Institute of Technology, Yancheng; 224051, China; (2) School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang; 212013, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 331-338
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Bio-oil organic phases were prepared by microwave pyrolysis of biomass with the compound absorber of TiC/SiC. The effects of mass ratios of TiC to SiC, absorber to biomass and microwave power to biomass on the yield of organic phase were analyzed by response surface methodology. The effects of pure SiC and compound absorber on the yields and chemical compositions of organic phase were analyzed and compared under the optimal conditions, and the characterization and analysis of bio-char were also carried out, to explore the properties and potential of organic phase and bio-char. The results showed that all factors had obvious effects on organic yield with interactions between the factors. The optimal yield was 28.60% under conditions of TiC to SiC mass ratio of 20%, absorber to biomass mass ratio of 53% and microwave power to biomass mass ratio of 9.5 W/g, which was similar to the predicted value of 28.69%. When the pure SiC was used under the optimal conditions, the organic yield was reduced to 23.35%. The pyrolysis products from cellulose and hemicellulose could be retained more by introducing appropriate amount of TiC, which could increase the organic yield and reduce the relative content of acids, ketones and phenols at the same time. A relatively large number of furans, alcohols and phenols and their relatively concentrated carbon atom distribution made organic phase have high potential as chemical raw materials. The NMR analysis showed that the ratio of aliphatic hydrogen/carbon to aromatic hydrogen/carbon in organic phase obtained by using compound absorber was increased significantly, which verified the accuracy of the analysis. In addition, the bio-char obtained by using the compound absorber had higher carbonization degree and adsorption performance, and its specific surface area and pore volume were 360 m2/g and 0.22 cm3/g respectively. It had high potential to make active materials. The research result provided experimental and theoretical basis for further industrial application research. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Silicon compounds
Controlled terms: Aliphatic compounds? - ?Biomass? - ?Carbonization? - ?Cellulose? - ?Chemical analysis? - ?Industrial research? - ?Ketones? - ?Microwave generation? - ?Phenols? - ?Pyrolysis ? - ?Silicon? - ?Silicon carbide? - ?Titanium carbide? - ?Titanium compounds
Uncontrolled terms: Adsorption performance? - ?Cellulose and hemicellulose? - ?Chemical compositions? - ?Chemical raw materials? - ?Microwave pyrolysis? - ?Optimal conditions? - ?Pyrolysis products? - ?Response surface methodology
Classification code: 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals? - ?713.2 Oscillators? - ?802.2 Chemical Reactions? - ?804.1 Organic Compounds? - ?804.2 Inorganic Compounds? - ?811.3 Cellulose, Lignin and Derivatives? - ?901.3 Engineering Research
Numerical data indexing: Percentage 2.00e+01%, Percentage 2.34e+01%, Percentage 2.86e+01%, Percentage 2.87e+01%, Percentage 5.30e+01%, Specific_Surface_Area 3.60e+05m2/kg, Specific_Volume 2.20e-04m3/kg
DOI: 10.6041/j.issn.1000-1298.2020.05.036
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
32. Turbulence Models on Simulation of Thermal Cavitating Flows around Hydrofoil
Accession number: 20202508853779
Title of translation:
Authors: Zhang, Desheng (1); Feng, Jian (1); Wan, Fulai (1); Li, Junfeng (1); Shi, Weidong (2)
Author affiliation: (1) National Research Center of Pumps, Jiangsu University, Zhenjiang; 212013, China; (2) School of Mechanical Engineering, Nantong University, Nantong; 226019, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 134-141
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The size of turbulence is of great significance to the accuracy of numerical calculation. In addition, the variation of gas-liquid two-phase mixed density in the cavitation zone has a great influence on the cavitation development process. In order to investigate the effect of turbulence models on numerical simulation of cavitating flows in thermo-fluids, combined filter-based model (FBM) with density-corrected model (DCM), three turbulence models (k-Ε, RNG k-Ε and SST k-ω) were modified based on the local mesh size and the density of vapor-liquid mixture. The original turbulence models and modified models were used in the numerical simulation of single-phase flow and gas-liquid two-phase flow around the NACA0015 hydrofoil in varying temperatures water. The numerical results were compared with experimental data. The results showed that the modified k-Ε model eliminated the effect of turbulence scale. In addition, the law of development of cavity was well consistent with the experimental results, according to the results calculated by the modified RNG k-Ε model. The modified RNG k-Ε revealed the law of cavitation with temperature variation simultaneously, i.e. as the temperature of the fluid increased, the vapor volume fraction was decreased, the cavitation intensity was weakened, and the cavity area became smaller. The adverse pressure gradient became smaller in the closed region of the cavity tail, and the gas-liquid interface became blurred, which reflected better corrected effect. According to validation calculations and composite comparison with the experiment, the modified RNG k-Ε was applicable for numerical simulation of gas-liquid two-phase flow in thermo-fluids which can provide theoretical basis and guidance for numerical simulation of low temperature thermal cavitating flow. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Two phase flow
Controlled terms: Boundary layer flow? - ?Cavitation? - ?Hydrofoils? - ?Liquids? - ?Numerical models? - ?Oceanography? - ?Phase interfaces? - ?Temperature? - ?Turbulence models
Uncontrolled terms: Adverse pressure gradient? - ?Cavitation intensity? - ?Gas - liquid two-phase flows? - ?Gas-liquid interface? - ?Numerical calculation? - ?Temperature variation? - ?Vapor volume fraction? - ?Varying temperature
Classification code: 471.1 Oceanography, General? - ?631.1 Fluid Flow, General? - ?631.1.1 Liquid Dynamics? - ?641.1 Thermodynamics? - ?801.4 Physical Chemistry? - ?921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2020.05.014
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
33. Design and Experiment of High-speed Rice Transplanter with Extensible Mulch Cutting Mechanism in Mulching Cultivation System
Accession number: 20202508853792
Title of translation:
Authors: Xu, Chunlin (1); Shan, Yiyin (1); Xin, Liang (1); Xie, Jiangtao (1); Li, Zheng (1); Zhao, Yun (1)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Xin, Liang(xinliang@neau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 79-87
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the problems of the root of rice seedling were damaged because of the existing rice transplanting mechanism without mulch cutting device or the structure of the mulch cutting device was complicated causing poor synchronization and missing transplanting, the high-speed transplanter with extensible mulch cutting mechanism in the mulching cultivation system was designed based on the agronomic requirements of rice transplanting. The working principles of theoretical model was analyzed and a kinematic model of the rice transplanting mechanism was established. Computer-aided analysis and optimization software based on the Visual Basic 6.0 was developed and used to obtain a set of structure parameters and the trajectory of seedling-picking needle tip point and mulch cutting knife endpoint trajectory, which satisfied the transplanting requirements, the optimized parameters were as follows: seedling-picking angle was 16.01°, seedling-pushing angle was 62.43°, the mulch slit length was 44.31 mm, the deviation of the mulch slit was 5.02 mm, and planting position was 21.63 mm. The 3D simulation model was combined with high speed photography test, the prototype machine test results were consistent with the theoretical analysis and virtual simulation results, the correctness and rationality of the design of extensible mulch cutting slit mechanism were verified. The soil bin transplanting experiment was conducted, the test showed that when the speed ratio characteristic coefficient was 1.57, the mechanism can finish cutting mulch and transplanting at the same time, the mulch slit length and plant location deviation of measured value with the theoretical values were less than 4 mm, which reflected the practicality of the rice transpalnter with extensible mulch cutting mechanism. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: High speed photography
Controlled terms: 3D modeling? - ?Agricultural machinery? - ?Computer aided analysis? - ?Cultivation? - ?Kinematics? - ?Visual BASIC
Uncontrolled terms: Mulching cultivation? - ?Optimization software? - ?Optimized parameter? - ?Rice transplanting mechanisms? - ?Structure parameter? - ?Theoretical modeling? - ?Theoretical values? - ?Virtual simulations
Classification code: 723.1.1 Computer Programming Languages? - ?723.5 Computer Applications? - ?742.1 Photography? - ?821.1 Agricultural Machinery and Equipment? - ?821.3 Agricultural Methods? - ?931.1 Mechanics
Numerical data indexing: Size 2.16e-02m, Size 4.00e-03m, Size 4.43e-02m, Size 5.02e-03m
DOI: 10.6041/j.issn.1000-1298.2020.05.008
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
34. Effects of Applying Biochar on Soil Comprehensive Fertility and Soybean Growth in Black Soil Area
Accession number: 20202508854056
Title of translation:
Authors: Wei, Yongxia (1, 2); Shi, Guoxin (1); Feng, Chao (1); Wu, Yu (3, 4); Liu, Hui (2, 5)
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 and Rural Affairs, Northeast Agricultural University, Harbin; 150030, China; (3) Heilongjiang Agricultural Reclamation Survey and Research Institute, Harbin; 150090, China; (4) College of Forestry, Northeast Forestry University, Harbin; 150040, China; (5) School of Science, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Liu, Hui(xiaolaida@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 285-294
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore the effects of biochar on soil water retention, soil nutrients and soybean growth in the black soil area, a four-year observation experiment was conducted on the runoff plot of 3° sloping farmland in the northeast black soil area. In 2015, C0 (0 t/hm2), C25 (25 t/hm2), C50 (50 t/hm2), C75 (75 t/hm2), and C100 (100 t/hm2) were set according to the amount of biochar applied. For each treatment, the same amount of biochar was continuously applied in 2016, 2017 and 2018. The results showed that the soil water storage in the 0~60 cm soil layer was increased and then decreased with the increase of carbon loading for four consecutive years, but the effect on water storage capacity in 60~100 cm soil layer was not significant. The saturated water content was increased gradually with the increase of carbon application. In 2015, the water holding capacity and the coefficient of wilting was increased gradually with the increase of carbon application. The growth rate was decreased first and then decreased from 2016 to 2018; applying biochar for four consecutive years increased the plant height and leaf area of soybean growth stages. The optimal treatments were C75, C50, C50 and C25 respectively; the canopy coverage and charcoal content of the four consecutive years showed a parabola change (R2>0.89, P2=0.861 5, P=0.001 2, RMSE was 0.75). The biochar application mode with the highest level of soil comprehensive fertility was summarized, that was, 50 t/hm2 of biochar applied for two consecutive years. The research result can provide a theoretical basis for the application of biochar in the black soil region. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 36
Main heading: Plants (botany)
Controlled terms: Carbon? - ?Charcoal? - ?Soil moisture
Uncontrolled terms: Available phosphorus? - ?Available potassiums? - ?Black soil regions? - ?Optimal treatment? - ?Soil water retention? - ?Soil water storage? - ?Water holding capacity? - ?Water storage capacity
Classification code: 483.1 Soils and Soil Mechanics? - ?524 Solid Fuels? - ?804 Chemical Products Generally
Numerical data indexing: Percentage 3.15e+01%, Percentage 3.67e+01%, Percentage 3.96e+01%, Percentage 8.14e+01%, Size 0.00e+00m to 6.00e-01m, Size 6.00e-01m to 1.00e+00m
DOI: 10.6041/j.issn.1000-1298.2020.05.031
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
35. Grapefruit Detection Model Based on IFSSD Convolution Network
Accession number: 20202508853769
Title of translation: IFSSD
Authors: Xiao, Deqin (1); Cai, Jiahao (1); Lin, Sicong (1); Yang, Qiumei (1); Xie, Xiaojun (2); Guo, Wanyi (1)
Author affiliation: (1) College of Mathematics and Informatics, South China Agricultural University, Guangzhou; 510642, China; (2) School of Medical Information Engineering, Guangzhou University of Chinese Medicine, Guangzhou; 510006, China
Corresponding author: Yang, Qiumei(yqmbegonia@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 28-35 and 97
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The detection, identification and precise positioning of fruit under natural conditions based on machine vision is very important for the development of intelligent picking robots. In order to solve the problem that the traditional fruit detection model for the small target grapefruit missed detection and the leaf was falsely detected as the expansion period grapefruit, an improved feature fusion single multibox detector (InceptionV3-feature fusion single shot-multibox detector, IFSSD) was designed. The feature fusion single multibox detector (feature fusion single shot-multibox detector, FSSD) was used as a base detector and optimized in two ways. On the one hand, the improved InceptionV3 network was used instead of very deep convolutional networks 16 (VGG16) as the backbone network to improve computational efficiency. On the other hand, the Focal Loss function was used instead of the Multibox Loss function, which improved the mischeck ingresss of the detector due to the imbalance of positive and negative samples. Finally, the test data set was verified, and the results showed that the model achieved an average accuracy of 93.7% (mAP) (IoU was greater than 0.5). The time of one image was 29 s. The model proposed can automatically detect the grapefruit in the grapefruit tree and locate it accurately in real time, which effectively promoted the development of intelligent picking robot. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Feature extraction
Controlled terms: Citrus fruits? - ?Computational efficiency? - ?Convolution? - ?Intelligent robots? - ?Statistical tests
Uncontrolled terms: Back-bone network? - ?Convolutional networks? - ?Detection models? - ?Grapefruit trees? - ?Missed detections? - ?Natural conditions? - ?Negative samples? - ?Precise positioning
Classification code: 716.1 Information Theory and Signal Processing? - ?731.6 Robot Applications? - ?821.4 Agricultural Products? - ?922.2 Mathematical Statistics
Numerical data indexing: Percentage 9.37e+01%, Time 2.90e+01s
DOI: 10.6041/j.issn.1000-1298.2020.05.003
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
36. Design and Application of Performance Test Bench for Rotary Tiller Components
Accession number: 20202508853404
Title of translation:
Authors: Zeng, Rong (1, 2); Li, Dongdong (1, 2); Zhu, Yinghao (1, 2); Xia, Junfang (1, 2)
Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture and Rural Affairs, Wuhan; 430070, China
Corresponding author: Xia, Junfang(xjf@mail.hzau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 88-97
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Multi-factor and multi-level machine-soil interaction experiment is the basis of structural design and determination of optimal working parameters for rotary tiller components. Existing indoor soil-bins have the disadvantages of backward control and measurement methods and inconveniences in replacement of blades rollers. At the same time, the problems of uncontrollable soil environmental factors exist in field experiments. In view of the above problems, a special intelligent test bench for performance test of rotary tiller components was presented, and its design principle, control mode and measurement method were expounded. The test bench consisted of a test trolley and a track system. The test bench was composed of the test trolley and the track system. The test trolley integrated the functions of rotary tillage, soil leveling, soil compaction, and tillage depth adjustment. With relatively independent functions, the test bench can realize rapid replacement of rotary blade rollers. The track system was assembled by multiple sections, for which the total length can be expanded, the height can be adjusted and the position can be moved. Electric drive mode was adopted in driving, rotary tillage, and tillage depth adjustment of the test trolley. Taking PLC as control core, radio frequency LoRa communication control technology was used to achieve wireless control input, which guaranteed the convenience in operation and maintenance of the test bench. The debugging results showed that the forward speed, rotary tillage speed and tillage depth can be adjusted continuously, which were in ranges of 0~1.17 m/s, 0~340 r/min and 0~30 cm, respectively. Multi-measuring functions were completed in the test bench, such as forward speed, working torque, rotary speed, and power consumption. The test channels were designed to be extensible. What’s more, wireless data transmission mode was adopted to realize wireless connection between sensor data and computer. Power consumption experiments of rotary blade rollers were carried out on the test bench. Taking forward speed, rotary speed and tillage depth as the experimental factors, and power consumption as experimental index, the rotating perpendicular combination experiment was conducted on standard rotary blade roller. The effects of the three factors on power consumption were studied and the regression (equation) of the experimental index and factors was established. In addition, the comprehensive experiment was carried out on combined rotary blade roller with the index of power consumption, and the effects of width and installation angle of the helical blade were analyzed. The above experiments verified that the presented test bench can meet the requirements of multi-factor and multi-level experiment, and the good adaptability to different rotary blade components. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 33
Main heading: Soil surveys
Controlled terms: Agriculture? - ?Digital storage? - ?Electric drives? - ?Electric power utilization? - ?Radio communication? - ?Rollers (machine components)? - ?Soil mechanics? - ?Soils? - ?Speed? - ?Structural design ? - ?Turbomachine blades
Uncontrolled terms: Communication control? - ?Control and measurement? - ?Design and application? - ?Environmental factors? - ?Intelligent test bench? - ?Machine-soil interaction? - ?Operation and maintenance? - ?Wireless data transmission
Classification code: 408.1 Structural Design, General? - ?483.1 Soils and Soil Mechanics? - ?601.2 Machine Components? - ?706.1 Electric Power Systems? - ?716.3 Radio Systems and Equipment? - ?722.1 Data Storage, Equipment and Techniques? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control
Numerical data indexing: Rotational_Speed 0.00e+00RPM to 3.40e+02RPM, Size 0.00e+00m to 3.00e-01m, Velocity 0.00e+00m/s to 1.17e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.05.009
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
37. Drying Kinetic Model of Microwave Coupled with Hot Air Drying of Straw-based Nutrient Seedling-growing Bowl Tray
Accession number: 20202508853451
Title of translation:
Authors: Yu, Haiming (1); Li, Haiyuan (2); Zhang, Xinyue (2); Wang, Hanyang (2); Sun, Yong (3)
Author affiliation: (1) College of Electrical and Information, Northeast Agricultural University, Harbin; 150030, China; (2) College of Engineering, Heilongjiang Bayi Agricultural University, Daqing; 163319, China; (3) College of Engineering, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Sun, Yong(sunyong740731@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 339-348
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore drying characteristics and the change law of moisture of straw-based nutrient seedling-growing bowl tray during the drying process, under the conditions of different drying temperatures (50, 55, 60, 65 and 70), hot air speed (1.0 m/s, 1.5 m/s, 2.0 m/s, 2.5 m/s and 3.0 m/s) and microwave power (180 W, 360 W, 540 W, 720 W and 900 W), the microwave coupled with hot air drying experiment was carried out for straw-based nutrient seedling-growing bowl tray to study the effects of different drying factors on drying rate and effective moisture diffusion coefficient, and establish a dry kinetic model. The results showed that there were only two stages: falling speed drying and rising speed drying, and there was no obvious constant-speed drying stage during the microwave combined hot air drying process of straw-based nutrient seedling-growing bowl tray. The microwave coupled with hot air drying can significantly increase the moisture diffusion capacity inside the materials and improve the effective moisture diffusion coefficient, and the change law of Deff with variation range of value from 2.296 41×10-8 m2/s to 6.147 36×10-8 m2/s was consistent with the law of MR. By fitting 12 dry kinetic mathematical models, the Midilli et al model had the largest R2 average value, the smallest χ2 and eRMSE average values, and there was a good consistency between the value of MR obtained from experiment and the prediction value based on Midilli et al model under different conditions, which indicated that the model was suitable for predicting the change law of moisture content during the drying process of the microwave coupled with hot air. The research results can provide theoretical basis and technical support for the application of microwave coupled hot air drying technology in drying straw-based nutrient seedling-growing bowl tray and other materials. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 49
Main heading: Drying
Controlled terms: Diffusion? - ?Kinetic parameters? - ?Kinetic theory? - ?Microwaves? - ?Moisture? - ?Nutrients? - ?Plants (botany)? - ?Solar dryers
Uncontrolled terms: Drying characteristics? - ?Drying temperature? - ?Kinetic modeling? - ?Microwave power? - ?Moisture diffusion? - ?Moisture diffusion coefficient? - ?Research results? - ?Technical support
Classification code: 657.1 Solar Energy and Phenomena? - ?711 Electromagnetic Waves? - ?931 Classical Physics; Quantum Theory; Relativity
Numerical data indexing: Power 1.80e+02W, Power 3.60e+02W, Power 5.40e+02W, Power 7.20e+02W, Power 9.00e+02W, Velocity 1.00e+00m/s, Velocity 1.50e+00m/s, Velocity 2.00e+00m/s, Velocity 2.50e+00m/s, Velocity 3.00e+00m/s
DOI: 10.6041/j.issn.1000-1298.2020.05.037
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
38. Design and Experiment of Grass-Soil Separation Device with Combination of Stubble Cutting and Grass Guiding Used for No-till Planter
Accession number: 20202508853465
Title of translation:
Authors: Huang, Yuxiang (1, 2); Gao, Pengyang (1); Zhang, Qingkai (1); Shen, Hao (1); Zhu, Ruixiang (1, 2); Shi, Jiangtao (3)
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; (3) Xi’an Yaao Agricultural Machinery Co., Ltd., Xi’an; 710300, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 67-78
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the problems of no-till corn planter, such as difficulty of passing through stubble fields, mixing of grass and soil in the seeding strip and the poor operation quality, a grass-soil separation device with combination of stubble cutting and grass guiding was designed based on the technical idea of combined operation of driving stubble cutting and passive guide grass. Several functions were achieved using the device, including cutting, poking, throwing, guiding, separation and flowing of both straw and grass. Based on the theoretical analysis of the interaction law between the key components (e.g., concave notched disc cutter and guide grass board) and straw and grass, key influencing factors and their value ranges were investigated. The optimal parameters of the guide board were determined by using CFD simulation software. To determine the optimal combination of structural parameters of concave notched disc cutter, the interaction model of grass-soil separation device-soil-straw was established by using EDEM discrete element simulation technology. The results showed that the main structural parameters affecting the tool performance were embedded depth, the height of cutter tooth and the angle of blade. When the embedded depth, blade height and knife dish angle were 73.63 mm, 69.70 mm and 23.41°, respectively, the performance of the device was the best, as indicated by good passage of the device with seeding straw cleaning rate of 90.16% and soil disturbance of 20.85%, which could meet the agronomic and technical requirements of no-till corn planter. Moreover, the device working performance was stable. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Soils
Controlled terms: Computer software? - ?Plants (botany)? - ?Seed? - ?Separation? - ?Structural optimization
Uncontrolled terms: Combined operations? - ?Discrete element simulation? - ?Key influencing factors? - ?Optimal combination? - ?Separation devices? - ?Structural parameter? - ?Technical requirement? - ?Working performance
Classification code: 483.1 Soils and Soil Mechanics? - ?723 Computer Software, Data Handling and Applications? - ?802.3 Chemical Operations? - ?821.4 Agricultural Products? - ?921.5 Optimization Techniques
Numerical data indexing: Percentage 2.09e+01%, Percentage 9.02e+01%, Size 6.97e-02m, Size 7.36e-02m
DOI: 10.6041/j.issn.1000-1298.2020.05.007
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
39. Simulation of Maize Dry Matter Accumulation in Normalized Logistic Model with Different Effective Accumulated Temperatures in Field
Accession number: 20202508854052
Title of translation:
Authors: Cai, Jiabing (1, 2); Chang, Hongfang (1, 2); Chen, He (1, 2); Zhang, Baozhong (1, 2); Wei, Zheng (1, 2); Peng, Zhigong (1, 2)
Author affiliation: (1) State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing; 100038, China; (2) National Center for Efficient Irrigation Engineering and Technology Research-Beijing, Beijing; 100048, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 263-271
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Dry matter accumulation (DM) and yield assessment are the key issues of maize production management and market of silage and deep processing. A three-year experiment (2017-2019) was carried out in maize fields of Changchun, Jilin Province, monitoring soil temperature (20 cm and 40 cm) in root zone, air temperature, canopy temperature and dry matter accumulation in maize growth stages. The Logistic model and the normalized Logistic model were established based on different effective accumulated temperatures with the observation in each year, separately. Then the validations of each normalized Logistic model were implemented by the observations in the others two years. Results showed that the Logistic models were varied in parameters with the data in different locations and years, based on the four effective accumulated temperatures (soil temperature at 20 cm and 40 cm, air temperature and crop canopy temperature) to simulate dry matter of single maize. However, the normalized Logistic model made a good performance in simulating maize dry matter accumulation under the normalized method. The statistical parameters of root mean square error, relative error, the coefficient of determination, and the index of model agreement reached good values between the simulation and observation. Especially for the normalized Logistic model in 2019, it was run better in the validation of 2017 and 2018. At the same time, the simulations effect was better in effective accumulated canopy temperature of normalized Logistic model. Thus it can be seen that the crop canopy temperature would be more available in regional irrigation management with its scale extension. These research results could support the precision irrigation system and management in irrigation district. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Irrigation
Controlled terms: Atmospheric temperature? - ?Crops? - ?Mean square error
Uncontrolled terms: Accumulated temperatures? - ?Coefficient of determination? - ?Dry matter accumulation? - ?Irrigation districts? - ?Irrigation management? - ?Precision irrigation? - ?Root mean square errors? - ?Statistical parameters
Classification code: 443.1 Atmospheric Properties? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?922.2 Mathematical Statistics
Numerical data indexing: Size 2.00e-01m, Size 4.00e-01m
DOI: 10.6041/j.issn.1000-1298.2020.05.029
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
40. Dynamic Characteristics of User’s Participation in Product Design Process
Accession number: 20202508853483
Title of translation:
Authors: Tan, Libin (1, 2); Tang, Dunbing (1); Zhu, Haihua (1)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing; 210016, China; (2) School of Mechanical Engineering, Anhui University of Technology, Ma’anshan; 243032, China
Corresponding author: Tang, Dunbing(d.tang@nuaa.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 404-410
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to obtain users’ massive innovative resources and real user needs, enterprises open product innovative design process to users. Due to the involvement of a large number of unorganized and autonomous individuals, the dynamic and complex evolution of the design process has gradually attracted attention. Unlike the existing literature, which regarded the user’s proposed product solution as a constant, the process of user participation in design was regarded as a dynamic gradient process. Therefore, the user’s individual solution and the product model interacted and iterated in the process. Firstly, the typical results of individual interaction of the user were studied. Based on the game theory, the game model was established and its Nash equilibrium was solved. Secondly, the dynamic evolution of user groups was analyzed and its growth process was simulated. The simulation results were compared with the definition of the scale-free network, and the conclusion was drawn that the user group involved in the design was a typical scale-free network. According to the user’s individual interaction model and the user group network model, the software simulation was carried out. The coal crusher design project was used as a case study to verify the correctness of the theoretical model and simulation results. The conclusion that the product model tended to converge in different communication environments was obtained. This conclusion provided a theoretical basis for the application of a large number of users to participate in the design. According to the discrete point simulation and the surface fit, the convergence speed distribution of product solution with user’s game income as the argument was obtained. It was concluded that the convergence speed of the overall solution of the product was related to the parameters of the interactive environment, which was more complex and irregular. Therefore, dynamic monitoring was important when users were involved in the product design process. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Product design
Controlled terms: Complex networks? - ?Computer software? - ?Game theory? - ?Intelligent systems
Uncontrolled terms: Communication environments? - ?Dynamic characteristics? - ?Dynamic monitoring? - ?Interactive Environments? - ?Product design process? - ?Software simulation? - ?Theoretical modeling? - ?User participation
Classification code: 722 Computer Systems and Equipment? - ?723 Computer Software, Data Handling and Applications? - ?723.4 Artificial Intelligence? - ?913.1 Production Engineering? - ?922.1 Probability Theory
DOI: 10.6041/j.issn.1000-1298.2020.05.045
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
41. Wheat Grain Integrity Image Detection System Based on CNN
Accession number: 20202508853807
Title of translation: CNN
Authors: Zhu, Shiping (1); Zhuo, Jiaxin (1); Huang, Hua (1, 2); Li, Guanglin (1)
Author affiliation: (1) College of Engineering and Technology, Southwest University, Chongqing; 400716, China; (2) College of Engineering, Kansas State University, Manhattan; KS; 66502, United States
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 36-42
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to recognize the sound and broken grains of wheat quickly and accurately, an image detection system of wheat grain integrity based on convolution neural network (CNN) was designed and implemented, and successfully applied to actual detection. The images of sound and broken kernels were captured and the image database and morphological characteristics database of single wheat grain were established after some image processing (segmentation and filtering). Both databases were divided into a training set and validation set according to the ratio of 7:3. Four typical convolutional neural networks (LeNet-5, AlexNet, VGG-16 and ResNet-34) were used to build wheat grain integrity recognition model and compared with the other two traditional algorithms of machine learning (SVM and BP neural network). The results showed that the training speed of the two traditional models was faster, and SVM gave the highest accuracy of 92.25%. By contrast, all four kinds of convolutional neural networks had an accuracy rate of about 98%. Among them, the accuracy of test set of AlexNet, which had the best recognition performance, was 98.02%, and the recognition speed of it was at a rate of 0.827 ms per grain. Therefore, a wheat grain integrity image detection system was developed based on this model, and used for actual detection. The detection results showed that the detecting time of 100 wheat grains was 26.3 s, among which, the average image acquisition time was 21.2 s, and the average image processing and recognition time was 5.1 s, and the average recognition accuracy was 96.67%. The system was easy to operate, which had stable performance, and provided a reference for the design of wheat grain image detection system. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Grain (agricultural product)
Controlled terms: Convolution? - ?Convolutional neural networks? - ?Database systems? - ?Image segmentation? - ?Machine learning
Uncontrolled terms: BP neural networks? - ?Convolution neural network? - ?Image detection systems? - ?Morphological characteristic? - ?Recognition accuracy? - ?Recognition models? - ?Stable performance? - ?Traditional models
Classification code: 716.1 Information Theory and Signal Processing? - ?723.3 Database Systems? - ?821.4 Agricultural Products
Numerical data indexing: Percentage 9.22e+01%, Percentage 9.67e+01%, Percentage 9.80e+01%, Time 2.12e+01s, Time 2.63e+01s, Time 5.10e+00s, Time 8.27e-04s
DOI: 10.6041/j.issn.1000-1298.2020.05.004
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
42. Classification Technology of Agricultural Questions Based on BiGRU_MulCNN
Accession number: 20202508854094
Title of translation: BiGRU_MulCNN
Authors: Jin, Ning (1, 2); Zhao, Chunjiang (3, 4); Wu, Huarui (3, 4); Miao, Yisheng (3, 4); Li, Si (5); Yang, Baozhu (3, 4)
Author affiliation: (1) School of Information and Electrical Engineering, Shenyang Agricultural University, Shenyang; 110866, China; (2) Graduate School, Shenyang Jianzhu University, Shenyang; 110168, China; (3) National Engineering Research Center for Information Technology in Agriculture, Beijing; 100097, China; (4) Beijing Research Center for Information Technology in Agriculture, Beijing; 100097, China; (5) Organization Department, Shenyang Jianzhu University, Shenyang; 110168, China
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: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 199-206
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With the rapid development of mobile internet, short text data of APPs has exploded. In the field of agriculture, tens of thousands of questions about agricultural technology have been put forward in agro-technical extension community. Accurate classification is the basis of agricultural intelligent Q&A and the guarantee of precise information service. In order to improve the performance of data classification, a short text classification method based on BiGRU_MulCNN model was proposed to overcome the limitations of the classification process, such as few vocabulary, sparse features, large amount of data, lots of noise and poor normalization. In the model, Jieba word segmentation tools and agricultural dictionary were selected to text segmentation, then TF-IDF algorithm was adopted to expand the text characteristic and weighted word vector according to the text of key vector, and bi-directional gated recurrent unit was applied to catch the context feature information, multi-convolutional neural networks was finally established to gain local multidimensional characteristics of text. Batch-normalization, Dropout, Global Average Pooling and Global Max Pooling were involved to solve over-fitting problem. The results showed that the model could classify questions accurately, with an accuracy of 95.9%. Compared with other models, such as CNN model, RNN model and CNN/RNN combinatorial model, BiGRU_MulCNN had obvious advantages in classification performance in intelligent agro-technical information service. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 37
Main heading: Classification (of information)
Controlled terms: Agricultural robots? - ?Agriculture? - ?Convolutional neural networks? - ?Information services? - ?Recurrent neural networks? - ?Text processing
Uncontrolled terms: Agricultural technologies? - ?Classification performance? - ?Classification process? - ?Classification technology? - ?Combinatorial modeling? - ?Over fitting problem? - ?Short text classifications? - ?Technical information
Classification code: 821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?903 Information Science
Numerical data indexing: Percentage 9.59e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.022
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
43. Typical Forage Recognition Based on Double Pooling and Multi-scale Kernel Feature Weighted Convolution Neural Network
Accession number: 20202508853496
Title of translation: CNN
Authors: Xiao, Zhiyun (1, 2); Zhao, Xiaochen (1, 2)
Author affiliation: (1) College of Electric Power, Inner Mongolia University of Technology, Huhhot; 010080, China; (2) Inner Mongolia Key Laboratory of Mechatronic Control, Inner Mongolia University of Technology, Huhhot; 010051, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 182-191
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 forage recognition under natural conditions, a convolutional neural network method based on double-pooling feature weighting and multi-scale convolution kernel feature weighting structure was proposed. The spatial information and significance information of the image were fully utilized by using the dual-pooling feature weighted structure. Two groups of feature graphs were obtained by max-pooling and mean-pooling of feature graphs output from the convolution layer, and then these two groups of features were spliced. Finally, a feature re-calibration strategy was introduced to weight the importance of current tasks according to the feature graphs of each channel, so as to enhance useful features and suppress useless features. Image information was more fully mined by using multi-scale feature weighting structure. The 3×3 and 5×5 convolution kernels were used at the same time, and the features of the first several layers of the network were spliced with the features of the current layer to improve feature utilization rate. Feature re-calibration strategy was also introduced to weight features. The recognition experiments of ten pasture images showed that the recognition rate of the method was 94.1%, which was 5.7 percentage points higher than that of VGG-13 network, the double pooling and multi-scale feature weighting structure effectively improved the recognition accuracy. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Scales (weighing instruments)
Controlled terms: Calibration? - ?Convolution? - ?Convolutional neural networks? - ?Image enhancement? - ?Network layers
Uncontrolled terms: Convolution kernel? - ?Convolution neural network? - ?Feature weighting? - ?Multi-scale features? - ?Natural conditions? - ?Recognition accuracy? - ?Spatial informations? - ?Utilization rates
Classification code: 716.1 Information Theory and Signal Processing? - ?723 Computer Software, Data Handling and Applications? - ?943.3 Special Purpose Instruments
Numerical data indexing: Percentage 9.41e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.020
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
44. Effects of Different Seedbed Straw Treatments on Summer Maize Seedling Growth under No-tillage Direct Seeding
Accession number: 20202508854053
Title of translation:
Authors: Wang, Weiwei (1, 2); Wu, Xiaofang (1); Wang, Qingqing (1); Li, Zhaodong (1, 2); Zhang, Chunling (1, 2); Chen, Liqing (1, 2)
Author affiliation: (1) School of Engineering, Anhui Agricultural University, Hefei; 230036, China; (2) Anhui Province Engineering Laboratory of Intelligent Agricultural Machinery and Equipment, Hefei; 230036, China
Corresponding author: Chen, Liqing(lqChen@ahau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 315-323
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to address the effects of different seedbed treatment on the morphological characteristics and population uniformity of maize seedlings under no-tillage seeding manners, a field positioning experiment was conducted in June 2018 at the Wanbei Comprehensive Experimental Station in Suzhou, Anhui Province. Four different no-tillage seeding manners were investigated after wheat straw returning to field, including stripe rotary tillage (ST-X), straw mulching tillage (SMT-Y), stripe vertical tillage (ST-Z) and stripe subsoiling tillage (SST). The seedbed soil flatness, transverse maximum height difference, seedling morphological characteristics (leaf age, plant height, stem diameter and root length per plant) and population’s uniformity were determined. Experiment results showed that the average soil flatness of ST-X, SMT-Y and ST-Z was decreased by 7.67 mm, 16.33 mm and 11.00 mm as compared with that of SST of strip subsoiling, respectively, however, only SMT-Y showed significant effect; the seedbed surface flatness from high to low was SMT-Y, ST-Z, ST-X and SST. In addition, the population’s uniformity of maize seedling stage of ST-X, SMT-Y and ST-Z was significantly increased by 4.34, 1.10 and 10.18 percentage points, respectively. The better the surface flatness effect of the seedbed was, the better the population’s uniformity, the worse the soil flatness effect, and the more serious the size of seedlings were. The population’s uniformity from large to small was SMT-Y, ST-Z, ST-X and SST. Due to the large amount of straw covered by the side-slumped (SMT-Y) seedbed, it was difficult to break through the straw layer after germination of maize seeds. Thus the average plant height, the stem diameter and the root length of seedlings were the lowest. Correlation analysis showed that there was a linear and significant negative correlation between soil flatness (SMN), horizontal maximum height difference (Δh) and population’s uniformity of the seedling stage (Q), the correlation coefficients were 0.963 and 0.914, respectively. In summary, the surface flatness effect of the seedbed helped to improve the population’s uniformity of maize seedling stage, the stripe vertical tillage anti-blocking manner was preferred among the four no-tillage seeding manners, which could effectively improve the soil structure of plough layer, provide a clean and flat seedbed, inhibit the waterlogging catastrophe of the gully to promote the growth of seedling, therefore this was the most suitable seedbed straw treatment for summer maize no-tillage seeding in Shajiang black soil region of Huaibei Plain. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Surface mount technology
Controlled terms: Cultivation? - ?Plants (botany)? - ?Population statistics? - ?Soils
Uncontrolled terms: Black soil regions? - ?Correlation analysis? - ?Correlation coefficient? - ?Experimental stations? - ?Morphological characteristic? - ?Negative correlation? - ?No-tillage seeding? - ?Percentage points
Classification code: 483.1 Soils and Soil Mechanics? - ?714.2 Semiconductor Devices and Integrated Circuits? - ?821.3 Agricultural Methods
Numerical data indexing: Size 1.10e-02m, Size 1.63e-02m, Size 7.67e-03m
DOI: 10.6041/j.issn.1000-1298.2020.05.034
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
45. Scale Effect Analysis of Landscape Pattern in Wengniute Banner
Accession number: 20202508853413
Title of translation:
Authors: Wang, Pengchong (1); Yu, Qiang (1); Pei, Yanru (1); Wang, Ge (1); Yue, Depeng (1); Hou, Hongbing (1)
Author affiliation: (1) Beijing Key Laboratory of Precision Forestry, Beijing Forestry University, Beijing; 100083, China
Corresponding author: Yue, Depeng(yuedepeng@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 223-231 and 181
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The spatial scale of landscape pattern has become the basis of landscape ecology research. By analyzing the characteristics and changing rules of the same landscape pattern in different scales and clarifying the scale effect of regional landscape pattern characteristics, it can be known more about the real situation of landscape pattern. Wengniute Banner of Chifeng City, Inner Mongolia was taken as the research area. The remote sensing images of the same month in 2008, 2013 and 2018 were used to combine the land use data of Wengniute Banner area. Landscape types were divided into six categories: cultivated land, woodland, grassland, water area, construction land and unused land. Landscape pattern index was analyzed. Six landscape indices at patch type level and six landscape indices at landscape level were selected to analyze the effects of different grain sizes on landscape pattern indices. The results showed that in landscape level pattern index, the number of patches was decreased from 5 391 to 4 231, the density of patches was decreased from 0.40 per hectare to 0.32 per hectare, the diversity of Shannon was increased from 1.37 to 1.45, and the evenness of Shannon was increased from 0.76 to 0.81, which indicated that the dominant landscape had not yet been formed, and the fragmentation of landscape was increased. At the level of patch type, the percentage of patch area had no obvious change with the change of grain size, and other landscape types were changed with the change of grain size. Among them, in 2013 and 2018, the granularity effect of water area on patch density was strong, which was from 0.005 per hectare to 0.046 per hectare and 0.010 per hectare to 0.046 per hectare, respectively. The granularity effect of unused land on effective network size was strong, which was from 24 596 m2 to 40 697 m2. The granularity effect of construction land on aggregation and cohesion was strong, which was from 0.9 to 0.3 and 94% to 49%, respectively. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Remote sensing
Controlled terms: Ecology? - ?Grain size and shape? - ?Land use
Uncontrolled terms: Construction land? - ?Cultivated lands? - ?Landscape ecology? - ?Landscape pattern? - ?Landscape pattern indices? - ?Patch densities? - ?Regional landscapes? - ?Remote sensing images
Classification code: 403 Urban and Regional Planning and Development? - ?454.3 Ecology and Ecosystems
Numerical data indexing: Area 2.46e+04m2 to 4.07e+04m2, Percentage 3.00e-01%, Percentage 4.90e+01%
DOI: 10.6041/j.issn.1000-1298.2020.05.025
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
46. Sensitivity Analysis and Parameter Estimation for Soil-Rice System Model
Accession number: 20202508853419
Title of translation: -
Authors: Shi, Xinrui (1, 2); Liang, Hao (3); Zhou, Feng (4, 5); Hu, Kelin (1, 2)
Author affiliation: (1) College of Land Science and Technology, China Agricultural University, Beijing; 100193, China; (2) Key Laboratory of Arable Land Conservation (North China), Ministry of Agriculture and Rural Affairs, Beijing; 100193, China; (3) College of Agricultural Engineering, Hohai University, Nanjing; 210098, China; (4) College of Urban and Environmental Sciences, Peking University, Beijing; 100871, China; (5) Laboratory for Earth Surface Processes, Ministry of Eduction, Beijing; 100871, China
Corresponding author: Hu, Kelin(hukel@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 252-262 and 271
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The nitrogen (N) transport and transformation processes in rice field is more complex than that in dry land. Process-based soil-rice system model requires many input parameters and it is difficult to calibrate, which severely restricts the model application in rice production region. To improve the calibration efficiency and reduce uncertainty in simulations, both Morris and Sobol’ methods were used to analyze the global sensitivities of input parameters (soil hydraulic, crop, and N transformation parameters) of the WHCNS_Rice model and guide model calibration. Two years of rice field experiments were conducted in the middle reaches of the Yangtze River. Ponding water depth, evapotranspiration (ET), dry matter weight and crop N uptake were all collected and used to evaluate the model. Results showed that the selected sensitive parameters were almost consistent for two methods, but the Morris method could quickly and effectively screen out sensitive parameters with small calculation workload, which is an effective global sensitivity analysis method for the WHCNS_Rice model. Among all model input parameters, the soil hydraulic parameters and crop parameters had the greatest influence on the output variables of crop growth, water and N fates compared with N transformation parameters. Within the soil hydraulic parameters, saturated moisture, field capacity and saturated hydraulic conductivity of the plowpan were the most sensitive parameters. For crop parameters, LAI, yield, dry matter weight, crop N uptake and ET were sensitive to total accumulated temperature, maximum specific leaf area and crop coefficient in different periods. Among the N turnover parameters, only the first order kinetic constant for volatilization and the denitrification empirical coefficient had some effects on ammonia volatilization and denitrification processes, respectively. Based on the results of sensitivity analysis, the sensitive parameters were calibrated to minimize error between simulated and observed measurements. The results showed that the simulated dry matter weight, crop N uptake, ET and ponding water depth were in good agreement with the measured values. Both the slopes of the linear regression equation and correlation coefficients between the simulated and measured values were close to 1 (P ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Parameter estimation
Controlled terms: Ammonia? - ?Crops? - ?Denitrification? - ?Efficiency? - ?Hydraulic conductivity? - ?Ponding? - ?Sensitivity analysis? - ?Soil moisture? - ?Uncertainty analysis
Uncontrolled terms: Accumulated temperatures? - ?Correlation coefficient? - ?Denitrification process? - ?Global sensitivity analysis? - ?Linear regression equation? - ?Saturated hydraulic conductivity? - ?Soil hydraulic parameters? - ?Transport and transformation
Classification code: 483.1 Soils and Soil Mechanics? - ?632.1 Hydraulics? - ?802.2 Chemical Reactions? - ?804.2 Inorganic Compounds? - ?821.4 Agricultural Products? - ?913.1 Production Engineering? - ?921 Mathematics? - ?922.1 Probability Theory
DOI: 10.6041/j.issn.1000-1298.2020.05.028
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
47. Calculation Method of Target Leaf Area Based on Mobile Laser Scanning
Accession number: 20202508853790
Title of translation:
Authors: Li, Qiujie (1); Yuan, Pengcheng (1); Deng, Xian (1); Ru, Yu (1)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing; 210037, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 51
Issue: 5
Issue date: May 25, 2020
Publication year: 2020
Pages: 192-198
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to solve the problem of variable-rate pesticide spraying in sparse branch orchard, a method of target leaf area calculation based on mobile laser scanning (MLS) technology was proposed to provide basic data for real-time variable-rate pesticide spraying. To eliminate the influence of LiDAR detection distance and vehicle speed on the density of point cloud, the resolution of each measurement point in vehicle moving direction and LiDAR scanning direction was calculated, and the variable-scale grid was established for MLS point cloud data. The grid area was taken as the leaf area covered by laser beam, and the regression model of real total leaf area (TLA) and total grid area (TGA) was established. In the experiment, simulation tree was used to simulate the target of thinning fruit trees, and an MLS measurement system was built to collect the cloud data of the target points. Through changing the detection distance and moving speed, totally 108 sample data for four targets with different thinning degrees were obtained. The experimental results showed that the number of target cloud was decreased significantly with the increase of detection distance and the decrease of moving speed with variation coefficient over 0.920 9, while the area of target grid can be extracted stably with variation coefficient less than 0.053 7. The r-squared of linear fitting of TLA and TGA was 0.909 0, and the mean value of relative error of TLA measurement was 9.16%. ? 2020, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Trees (mathematics)
Controlled terms: Forestry? - ?Laser applications? - ?Laser beams? - ?Logistic regression? - ?Optical radar? - ?Orchards? - ?Pesticides? - ?Scanning
Uncontrolled terms: Measurement points? - ?Measurement system? - ?Moving direction? - ?Pesticide spraying? - ?Point cloud data? - ?Real-time variable? - ?Regression model? - ?Variation coefficient
Classification code: 716.2 Radar Systems and Equipment? - ?744.8 Laser Beam Interactions? - ?744.9 Laser Applications? - ?803 Chemical Agents and Basic Industrial Chemicals? - ?821.3 Agricultural Methods? - ?921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Numerical data indexing: Percentage 9.16e+00%
DOI: 10.6041/j.issn.1000-1298.2020.05.021
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2020 Elsevier Inc.
Data Provider: Engineering Village
作者登錄
審稿登錄
編輯登錄
讀者登錄
快速檢索
友情鏈接
