2012年第43卷第5期共收錄40篇
1. Accession number:20122715200086
Title:Fluidization characteristics of liquid-liquid circulating fluidized bed for fluid ice production
Authors:Liang, Kunfeng1 ; Gao, Chunyan1 ; Wang, Lin2
Author affiliation:1 College of Vehicle and Motive Power Engineering, Henan University of Science and Technology, Luoyang 471003, China
2 College of Architectural Engineering, Henan University of Science and Technology, Luoyang 471003, China
Corresponding author:Liang, K. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:210-215
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Fluidization characteristics of drops or ice particles in liquid-liquid circulating fluidized bed (LLCFB) for fluid ice production were experimentally studied by means of image gathering and processing. Four typical fluidization characteristics were defined; they were the diffuseness, convergence, adhesion and coalescence of particles. Particles size distributions along the height of LLCFB were obtained. The relativity was revealed between particles fluidization characteristics and fluidization states of LLCFB based on Froude number, Fr and the range of operating parameters combination was discussed which could achieve particulate fluidization states of LLCFB. The results show that the variations of particles fluidization characteristics and sizes distributions are presented by the effect of the height, operating parameters and their combination. The particles diffuseness firstly happened at the bottom of LLCFB, 0.50 m, under the influence of particles phase change which further led to the convergence, adhesion and coalescence of particles at the other heights, but the phenomena that larger particles formed due to the coalescence of particles must occur. Fluidization states were estimated by Fr calculation and directly affected by particles fluidization characteristics, its perfect fluidization states and particulate fluidization were mainly appeared at some range of operating parameters, such as smaller volume flow-rate of dispersive liquid and lower velocities and temperature of cycle liquid coolant.
Number of references:9
Main heading:Liquids
Controlled terms:Adhesion - Coalescence - Comminution - Fluidization - Ice - Image analysis
Uncontrolled terms:Circulating fluidized bed - Fluidization characteristics - Fluidization state - Ice particles - Ice production - Image gathering - Liquid coolant - Liquid-liquids - Operating parameters - Operation parameters - Particles size distribution - Particulate fluidization - Phase Change
Classification code:443 Meteorology - 741 Light, Optics and Optical Devices - 801.3 Colloid Chemistry - 802.3 Chemical Operations - 931.2 Physical Properties of Gases, Liquids and Solids
DOI:10.6041/j.issn.1000-1298.2012.05.036
Database:Compendex
2. Accession number:20122715200052
Title:Optimization design of common-rail injector driving circuit based on bootstrap circuit
Authors:Guo, Shuman1, 2 ; Su, Wanhua1 ; Liu, Erxi1 ; Chen, Liyong1
Author affiliation:1 State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
2 Department of Mechanical Engineering, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, China
Corresponding author:Guo, S. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:11-15
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The driving mode of Peak & Hold current shape is adopted in common rail diesel electronic control injector driving circuit. The requirements of current change are different in different stages. In order to meet the changes in the injection process, the state responses characteristics of the circuits to optimize the circuit and improve the response speed of electronic valve were analyzed theoretically. The driving circuit was designed based on the bootstrap circuit. The results showed that the fluctuations amplitude of the current in the hold stage reduced by 50% under the same driving parameters in the optimized circuit, and the response time was only 20 μs in the injector closing process, which realized the purpose of precise control of the injection quantity and injection timing.
Number of references:10
Main heading:Electric network analysis
Controlled terms:Control - Industrial electronics - Jet pumps - Optimization - Servomechanisms - Solenoid valves
Uncontrolled terms:Bootstrap circuits - Common rail - Current change - Driving circuits - Driving mode - Driving parameters - Electronic controls - Electronic valves - Injection process - Injection quantity - Injection timing - Optimization design - Precise control - Response speed - State response
Classification code:732 Control Devices - 731 Automatic Control Principles and Applications - 716 Telecommunication; Radar, Radio and Television - 715 Electronic Equipment, General Purpose and Industrial - 921.5 Optimization Techniques - 714 Electronic Components and Tubes - 703.1.1 Electric Network Analysis - 619 Pipes, Tanks and Accessories; Plant Engineering Generally - 618.2 Pumps - 705 Electric Generators and Motors
DOI:10.6041/j.issn.1000-1298.2012.05.002
Database:Compendex
3. Accession number:20122715200067
Title:Conditions optimization for tar combined removal in the woodblock gasification technological process
Authors:Li, Dazhong1 ; Wu, Yingjie1 ; Shan, Zhiwei1
Author affiliation:1 Department of Automation, North China Electric Power University, Baoding 071003, China
Corresponding author:Li, D. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:97-102
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The LS-SVM (least square supporting vector machine) model of combined tar removal process in pine block gasification was established according to the experimental data. On the basis of condition optimizing for tar removal in the furnace, multi-objective optimization function for catalytic activity was put forward, and then the Pareto-optimal solutions were gained after optimization. The results showed that the tar content from gasifier outlet was less than 2 g/m3, which met the requirements of inlet tar content for catalytic cracker. The tar content at the entrance of tar catalytic cracker was between 0.126 g/m3 and 0.340 g/m3. The gas heating value was more than 4 MJ/m3, met the engineering requirements, so after condition optimization, the gas quality is better than that of the experimental results.
Number of references:10
Main heading:Tar
Controlled terms:Gasification - Optimization
Uncontrolled terms:Catalytic crackers - Experimental data - Gas quality - Gasifiers - Heating value - Least Square - Multi-objective optimization function - Pareto optimal solutions - Supporting vector machine - Tar removal - Technological process
Classification code:411 Bituminous Materials - 513 Petroleum Refining - 524 Solid Fuels - 802.3 Chemical Operations - 804 Chemical Products Generally - 921.5 Optimization Techniques
DOI:10.6041/j.issn.1000-1298.2012.05.017
Database:Compendex
4. Accession number:20122715200078
Title:Diagnosis model of crop nutrient deficiency symptoms based on regularized adaptive fuzzy neural network
Authors:Guan, Haiou1 ; Yi, Shujuan1 ; Jiao, Feng2 ; Xu, Shaohua3 ; Zuo, Yuhu2 ; Jin, Baoshi2
Author affiliation:1 Department of Information Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, China
2 Department of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China
3 Department of Computer and Information Technology, Northeast Petroleum University, Daqing 163318, China
Corresponding author:Yi, S. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:162-167 156
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Aiming at the ambiguity and uncertainty between nutrient deficiency and color characteristic of plant canopy image, a classification decision model based on regularized adaptive fuzzy neural network was set up to diagnose plant nutrition by using the complete rules of inference of fuzzy logic and adaptive of neural network. The "if-then" rules was fully used by the model, and the adaptive selection of law-level nodes and back propagation learning algorithm were given, meanwhile, network inference construction was perfected. The result of diagnosing soybean nutrient deficiency showed that the accuracy can be reach to 100%, meanwhile, the model has many advantages such as fast speed, stable, high precision, good robustness, as well as good adaptability and practical applicability.
Number of references:19
Main heading:Nutrients
Controlled terms:Fuzzy logic - Learning algorithms - Neural networks
Uncontrolled terms:Adaptive fuzzy neural network - Adaptive selection - Backpropagation learning algorithm - Classification decision - Color characteristics - Crop nutrients - Diagnosis model - High precision - Network inference - Nutrient deficiency - Plant canopies - Plant nutrition - Regularized
Classification code:721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 723 Computer Software, Data Handling and Applications - 723.4 Artificial Intelligence - 821.2 Agricultural Chemicals
DOI:10.6041/j.issn.1000-1298.2012.05.028
Database:Compendex
5. Accession number:20122715200068
Title:Fitting models of water desorption and adsorption isotherms of macadamia nut shell
Authors:Wang, Yunyang1 ; Zhang, Li1 ; Wang, Shaojin2 ; Tang, Juming3 ; Li, Yuanrui1
Author affiliation:1 College of Food Science and Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
2 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
3 Department of Biological Systems Engineering, Washington State University, Pullman 99164-6120, United States
Corresponding author:Li, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:103-107
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Desorption and adsorption isotherms of macadamia nut shell at 25°C were determined. Non-linear regression analysis was used to evaluate the fitness of the six commonly used models based on the experimental data, and to determine the best models and their parameters. The results showed that the obtained desorption and adsorption isotherms were of type I, according to IUPAC's classification. The hysteresis loop was of type H3. GAB model was the best fitted for desorption and adsorption isotherms. The parameters A, B and C of GAB model for desorption isotherm were 9.693, 0.605 and 8.378 respectively, and those for adsorption isotherm were 9.695, 0.635 and 3.268. The results provided fundamental data for macadamia nut preservation and processing.
Number of references:22
Main heading:Adsorption isotherms
Controlled terms:Desorption - Regression analysis
Uncontrolled terms:Best model - Desorption isotherms - Experimental data - Fitting model - GAB model - Macadamia nut - Non-linear regression analysis - Nut-shells - Shell - Water desorption
Classification code:801.4 Physical Chemistry - 802.3 Chemical Operations - 922.2 Mathematical Statistics
DOI:10.6041/j.issn.1000-1298.2012.05.018
Database:Compendex
6. Accession number:20122715200063
Title:Numerical calculation and experiment of non-overload low specific speed sewage pump with super-thick blades
Authors:Chen, Bin1, 2 ; Zhang, Hua1 ; Shi, Weidong1 ; Zhang, Desheng1 ; Xu, Yandong1
Author affiliation:1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
2 Nanjing Lanshen Pump Corp., Ltd., Nanjing 211500, China
Corresponding author:Shi, W. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:74-78
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The flow section area was controlled by increasing thickness of centrifugal impeller blade, so as to realize the non-overload characteristics of low specific speed sewage pump. It was shown from the external characteristic experimental results of prototype when the flow section area changed gently, the extreme point of shaft power curve appeared, and the units showed an obvious non-overload performance after the flow rate attained to 1.5 times of the designed flow. The experiments and prediction were also conducted to the section which perpendicular to the axis and passing by neutral position of impeller outlet. The experimental results showed that under the designed working conditions, the external characteristic experimental results were not only consistent with the computational results, but the PIV experimental data also had very good agreement with the internal flow field computation. At the same time, in the impeller channel, the relative velocity of pressure side was less than suction side due to the Coriolis effect, the flow field distributed uniformity with no obvious flow separation and vortex. The flow of each impeller channel was not in absolutely axial symmetrical distribution because of the rotor-stator interaction between the impeller and volute.
Number of references:11
Main heading:Impellers
Controlled terms:Centrifugation - Experiments - Flow fields - Sewage pumps
Uncontrolled terms:Area-changed - Axial symmetrical - Centrifugal impeller - Computational results - Coriolis effect - Experimental data - External characteristic - Extreme points - Impeller channels - Impeller outlet - Internal flow field - Low specific speed - Non-overload - Numerical calculation - Pressure side - Relative velocity - Rotor-stator interactions - Shaft power - Suction side - Super-thick blade - Working conditions
Classification code:452.1 Sewage - 601.2 Machine Components - 631.1 Fluid Flow, General - 802.3 Chemical Operations - 901.3 Engineering Research
DOI:10.6041/j.issn.1000-1298.2012.05.013
Database:Compendex
7. Accession number:20122715200075
Title:Prediction model of beef marbling grades based on fractal dimension and image features
Authors:Chen, Kunjie1 ; Wu, Guiru1 ; Yu, Haiming1 ; Liu, Deying1
Author affiliation:1 Key Laboratory of Intelligent Agricultural Equipment of Jiangsu Province, Nanjing Agricultural University, Nanjing 210031, China
Corresponding author:Chen, K. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:147-151
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:In order to establish predicting models for beef marbling grade, one hundred and thirty-five beef rib-eye samples were collected from a beef processing factory. A three-grader panel was employed to assign each sample a marbling score according to the official standard cards. Then images of each sample were captured with a CCD camera. The beef marbling images were separated and the indicators such as ratio of fat area, the total number of fat particles and numbers of the big and the small fat particles were obtained by using image processing technologies. After fractal dimensions of marbling images was calculated through the varying megascopic degree method, a multiple linear regression model and a multiple polynomial model for the prediction of marbling score were derived based on the obtained fractal dimensions and image feature parameters. Validation results showed that the correct percentage of the marbling grade predicted by the multiple linear model and by the multiple polynomial model were 75% and 87.5%, respectively, indicating that beef marbling grades can be determined by using fractal dimension and image processing method.
Number of references:17
Main heading:Fractal dimension
Controlled terms:Beef - Image processing - Linear regression - Mathematical models - Meats
Uncontrolled terms:Fat particles - Grade - Image features - Image processing - methods - Image processing technology - Marbling - Multiple linear models - Multiple linear regression models - Polynomial models - Predicting models - Prediction model - Validation results
Classification code:741 Light, Optics and Optical Devices - 822.3 Food Products - 921 Mathematics - 922.2 Mathematical Statistics
DOI:10.6041/j.issn.1000-1298.2012.05.025
Database:Compendex
8. Accession number:20122715200062
Title:Finite element analysis of shaft strength of multi-stage centrifugal pumps based on APDL
Authors:Li, Wei1 ; Shi, Weidong1 ; Shen, Yongjuan1 ; Jiang, Xiaoping1 ; Pan, Zhongyong1
Author affiliation:1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Shi, W. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:69-73
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:In order to avoid the disadvantages of cumbersome, error-prone, long cycle of shaft strength calculation by traditional method, a multi-stage centrifugal pump shaft strength calculation program was developed based on parametric design language APDL. By transferring script file of the self model program and executing the command SOLVE to calculate, parametric automatic modeling, load application and solution, and the results of 3-D parametric display under zero-flow conditions and design point conditions were realized. The stress distribution of the shaft at different conditions on different sections and dangerous position were clearly described, and the accurate calculation of the shaft strength can be performed. Application examples showed that the design and development application program was used friendly and can get accurate calculations with visual results. This program of shaft strength calculation greatly improved the computational efficiency of shaft strength and reduced the analysis cost.
Number of references:11
Main heading:Three dimensional
Controlled terms:Centrifugal pumps - Finite element method - Stress concentration
Uncontrolled terms:Analysis costs - APDL language - Application examples - Application programs - Automatic modeling - Design and Development - Design points - Error prones - Load application - Long cycles - Model programs - Multi-stage - Parametric design - Shaft strength - Strength calculation
Classification code:421 Strength of Building Materials; Mechanical Properties - 422 Strength of Building Materials; Test Equipment and Methods - 618.2 Pumps - 902.1 Engineering Graphics - 921.6 Numerical Methods
DOI:10.6041/j.issn.1000-1298.2012.05.012
Database:Compendex
9. Accession number:20122715200074
Title:Dry characteristics and grinding technology for North Cordyceps
Authors:Gong, Yuanjuan1 ; Meng, Fanzhuang1 ; Qin, Junwei1 ; Lin, Jing1
Author affiliation:1 College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
Corresponding author:Gong, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:142-146
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:After dried by the hot-air dying, the vacuum drying and the vacuum freezing drying, the area shrinkage percentage of North Cordyceps was analyzed by the digital image processing technology, and combined the shearing and the crushing mechanic characteristics, the suitable drying technology was chosen. Considering the powder quantity percent passing through the 200 mesh standard sieve, the processing of the shearing method and the ball milling method were investigated, the optimal processing parameters of the dried North Cordyceps were confirmed. The results show that the area shrinkage percentage, the shearing stress and the crushing stress of the freeze-dried North Cordyceps are the smallest, so the vacuum freeze drying technology is chosen as the suitable drying treatment method. The optimal processing parameters of the shearing grinding are as follows: the grinding time is 3min, the material filling rate is 25%, the material moisture content is 3%, under these conditions, the grinding efficiency is 68.5 g/h, the energy consumption is 0.46 kW·h/kg. The optimal ball milling parameters are as follows: the milling speed is 266 r/min, the milling time is 60 min, the medium filling rate is 23%, the material filling rate is 15%, under these conditions, the grinding efficiency is 36.5 g/h, the energy consumption is 2 kW·h/kg.
Number of references:11
Main heading:Drying
Controlled terms:Ball milling - Crushing - Energy utilization - Experiments - Filling - Grinding machines - Image processing - Milling (machining) - Optimization - Shearing
Uncontrolled terms:Ball milling parameters - Digital image - Dry characteristics - Drying technology - Drying treatment - Filling rate - Grinding efficiency - Grinding technologies - Grinding time - Hot air - Milling methods - Milling time - North Cordyceps - Optimal processing - Shearing stress - Vacuum drying - Vacuum-freeze drying
Classification code:921.5 Optimization Techniques - 901.3 Engineering Research - 802.3 Chemical Operations - 741 Light, Optics and Optical Devices - 691.2 Materials Handling Methods - 642.1 Process Heating - 606.2 Abrasive Devices and Processes - 604.2 Machining Operations - 604.1 Metal Cutting - 533.1 Ore Treatment - 525.3 Energy Utilization
DOI:10.6041/j.issn.1000-1298.2012.05.024
Database:Compendex
10. Accession number:20122715200055
Title:Engine waste heat recovery based on single screw expander
Authors:Zhang, Hongguang1 ; Liu, Bin1 ; Chen, Yan1 ; Yang, Kai1 ; Zhang, Jian1 ; Wang, Dongfang1
Author affiliation:1 College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
Corresponding author:Zhang, H. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:27-31
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:In order to make better use of waste heat energy from engine exhaust gas, the waste heat recovery system based on organic Rankine cycle (ORC) was presented, a single screw expander was used as the power output device, R245fa was used as working fluid, the concept and calculating method of waste heat recovery utilization rate was introduced. On the basis of engine test results, the effects of working fluid evaporating pressure and engine speed on the ORC system performance were analyzed and discussed, and then the optimal value of working fluid evaporating pressure was selected. According to the research results, when the working fluid evaporating pressure is 3.0 MPa, ORC waste heat recovery system can work properly over the whole range of engine speed, the maximum of net power is 12.1 kW, the maximum of first law efficiency is 11.27%, the maximum of second law efficiency is 25.8%, the maximum of waste heat recovery utilization rate is 8.9%, waste heat energy from engine exhaust gas can be recovered effectively.
Number of references:10
Main heading:Fluids
Controlled terms:Engines - Exhaust systems (engine) - Rankine cycle - Screws - Waste heat - Waste heat utilization
Uncontrolled terms:Calculating methods - Engine speed - Engine test - First law efficiency - Heat energy - Heat recovery systems - Optimal values - Organic Rankine cycles - Power out put - Research results - Second law efficiencies - Single screw - Utilization rates - Working fluid
Classification code:525.3 Energy Utilization - 605 Small Tools and Hardware - 612 Engines - 631 Fluid Flow - 641.1 Thermodynamics - 643.1 Space Heating
DOI:10.6041/j.issn.1000-1298.2012.05.005
Database:Compendex
11. Accession number:20122715200060
Title:Drought remote sensing for winter wheat based on double parabola NDVI-ST space
Authors:Liu, Ying1 ; Ma, Baodong2 ; Wu, Lixin3 ; Lin, Yawei1
Author affiliation:1 College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2 Institute for Geoinformatics and Digital Mine Research, Northeastern University, Shenyang 110004, China
3 Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China
Corresponding author:Liu, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:55-63
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Take the drought remote sensing for winter wheat in He'nan province as an example, the normalized difference vegetation index (NDVI), enhanced vegetation index (EVI), leaf area index (LAI) and land surface temperature (ST) data from MODIS/AQUA were applied to analyze NDVI-ST space and EVI-ST space. It was discovered that NDVI-ST and EVI-ST spaces were double parabola as compared with NDVI-ST, EVI-ST and LAI-ST triangle or trapezoidal space. The relationship between TVDI and soil moisture was analyzed with the obtained TVDI derived from the spaces. The results show that the NDVI-ST double parabola space is better than the others to reflect the 10 cm-depth soil moisture. Based on the TVDI obtained from the NDVI-ST double parabola space, the drought situation in He'nan province, from February 26, 2011 to May 16, 2011 was evaluated. Compared with the raining data observed by local weather stations, the general spatio-temporal features of the drought situation of winter wheat in He'nan in the spring of 2011was revealed.
Number of references:13
Main heading:Space optics
Controlled terms:Crops - Drought - Remote sensing - Sodium compounds - Soil moisture
Uncontrolled terms:Double parabola curvature - Enhanced vegetation index - Land surface temperature - Leaf Area Index - Normalized difference vegetation index - Spatio-temporal - Temperature-vegetation dryness indices - Weather stations - Winter wheat
Classification code:444 Water Resources - 483.1 Soils and Soil Mechanics - 731.1 Control Systems - 741.1 Light/Optics - 804.1 Organic Compounds - 821.4 Agricultural Products
DOI:10.6041/j.issn.1000-1298.2012.05.010
Database:Compendex
12. Accession number:20122715200061
Title:Performance curve instability and rotating stall
Authors:Pan, Zhongyong1 ; Li, Junjie1 ; Li, Xiaojun1 ; Yuan, Shouqi1
Author affiliation:1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Pan, Z. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:64-68
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:CFD was used to study the mechanism of the performance curve instability of the mixed flow pump with vane diffuser characterized by the positive slop of the head-flow curve. The two parts of performance curve instability including the dramatically head drop and a slightly rise of the head when the flow rates decreased further. The reason of the two parts was that the decreasing of the effective diameter of the impeller blade TE was caused by the appearance of the vortices in the tip of the impeller outlet which was caused by the reverse flow. The flow separation and the flow pattern of the tested pump shifted to the centrifugal pump which led to the strong vortices in the impeller hub respectively and it was got by steady simulation. The unsteady simulation was used to study the reason of reverse at hub of impeller outlet and it was found that the stall is the main reason for the mixed flow pump shifting to the centrifugal pump. It was also found that asymmetry of pressure at vane inlet is the main reason of the stall for its propagation.
Number of references:12
Main heading:Stability
Controlled terms:Centrifugal pumps - Flow measurement - Impellers - Vortex flow
Uncontrolled terms:Effective diameter - Head drop - Impeller blades - Impeller outlet - Mixed flow pump - Performance curve - Reverse flow - Rotating stalls - Steady simulation - Unsteady simulations
Classification code:961 Systems Science - 951 Materials Science - 931 Classical Physics; Quantum Theory; Relativity - 801 Chemistry - 631.1 Fluid Flow, General - 618.2 Pumps - 601.2 Machine Components
DOI:10.6041/j.issn.1000-1298.2012.05.011
Database:Compendex
13. Accession number:20122715200082
Title:Greenhouse control system design based on singular perturbation theory
Authors:Li, Yongbo1, 2 ; Zhou, Wei1 ; Wang, Xiaochan1, 2 ; Ding, Weimin1, 2
Author affiliation:1 College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
2 Key Laboratory of Intelligent Agricultural Equipment in Jiangsu Province, Nanjing Agricultural University, Nanjing 210031, China
Corresponding author:Li, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:184-189
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:In order to set up an integrated greenhouse control system including environmental factors, plant growth period and upper index, relevant literatures of greenhouse control system were analyzed and based on control period principle, the literature was divided into three types of control systems: greenhouse environmental factors control system (fast speed time-varying systems), crop growing period control system (middle speed time-varying systems) and upper index control system in year (slow speed time-varying systems). By the multi-time-scale analysis, three types of control systems were found out to have multi-time-scale property. By means of singular perturbation theory, the greenhouse control system was designed hierarchically at first, and then the overall model of control system of greenhouse and the solution of the controller were obtained within such theoretical framework. Finally, the example and simulation results show that the proposed method is simple, effective and convenient for the application.
Number of references:29
Main heading:Control systems
Controlled terms:Greenhouses - Perturbation techniques - Time varying systems
Uncontrolled terms:Control periods - Environmental factors - Growing period - Multi-time-scale - Overall-model - Plant growth - Singular perturbation theory - Slow speed - Theoretical framework - Time varying
Classification code:402.1 Industrial and Agricultural Buildings - 731.1 Control Systems - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2012.05.032
Database:Compendex
14. Accession number:20122715200059
Title:Soil water retention curve based on fractal theory in greenhouse soil
Authors:Zheng, Zicheng1 ; Li, Wei1 ; Li, Tingxuan1 ; Yu, Haiying1 ; Zeng, Li1
Author affiliation:1 College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China
Corresponding author:Li, T. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:49-54
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The relationship between the fractal dimension for soil water retention curve of the disturbed and undisturbed soil was studied in greenhouse soil. It was showed that on the condition of the same soil texture, fractal dimensions increased with the increasing of soil bulk density. There was significant linear relationship between the fractal dimension of the disturbed soil and that of the undisturbed soil. Based on the fractal dimension of soil weight distribution and soil water retention curve of Brook-Corey model, water retention curves of the disturbed and undisturbed soil were predicted. The results show that the predicted values of soil water retention curves fit the measured data. So, it is feasible to estimate soil water retention curve of the undisturbed soil based on the fractal dimension of the disturbed soil in the greenhouse soil.
Number of references:15
Main heading:Fractal dimension
Controlled terms:Geologic models - Greenhouses - Soil moisture
Uncontrolled terms:Disturbed soil - Fractal theory - Greenhouse soil - Soil water retention curves - Undisturbed soils
Classification code:402.1 Industrial and Agricultural Buildings - 481.1 Geology - 483.1 Soils and Soil Mechanics - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2012.05.009
Database:Compendex
15. Accession number:20122715200072
Title:Drying characteristics and dynamics of apple slices by explosion puffing drying at variable temperatures and pressure difference
Authors:He, Xinyi1 ; Cheng, Lili1, 2 ; Liu, Jinfu1 ; Huang, Zonghai1 ; Du, Xianfeng2 ; Wang, Jiao1, 2
Author affiliation:1 Department of Food Science, Tianjin Agricultural University, Tianjin 300384, China
2 College of Tea and Food Science and Technology, Anhui Agricultural University, Hefei 230036, China
Corresponding author:He, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:130-135
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The objective was to investigate the effects of puffing initial moisture content and vacuum drying temperatures on the characteristics of apple slices dried by explosion puffing drying at variable temperatures and pressure difference. The drying kinetics model of explosion puffing drying at variable drying conditions was obtained. Results showed that the drying process of explosion puffing drying at variable temperatures and pressure difference obviously existed increase-rate, constant-rate and falling-rate period. Page model provided better simulation of drying curves for apple slices at different puffing drying conditions. The effective moisture diffusivity of apple slices dried by explosion puffing drying at variable temperatures and pressure difference was among 1.52×10-9~8.87×10-9 m2/s. The established model can predict the moisture content change during explosion puffing drying time. Fitting undetermined coefficients k and n of Page model were linear with puffing initial moisture content and vacuum drying temperature. The coefficients of correlation r2 were 0.845 and 0.997, respectively.
Number of references:18
Main heading:Drying
Controlled terms:Computer simulation - Explosions - Fruits - Plants (botany) - Vacuum
Uncontrolled terms:Apple slices - Drying characteristics - Drying condition - Drying curves - Drying kinetic - Drying process - Drying time - Effective moisture diffusivity - Falling-rate period - Initial Moisture Content - Page models - Pressure differences - Vacuum drying - Variable temperature
Classification code:461.9 Biology - 502.1 Mine and Quarry Operations - 633 Vacuum Technology - 642.1 Process Heating - 723.5 Computer Applications - 821.4 Agricultural Products
DOI:10.6041/j.issn.1000-1298.2012.05.022
Database:Compendex
16. Accession number:20122715200085
Title:Micro driving system for robot joint based on electro-hydrostatic actuation technology
Authors:Chen, Naijian1 ; Zhang, Jinhua2 ; Ai, Changsheng1 ; Song, Fangzhen1
Author affiliation:1 School of Mechanical Engineering, University of Jinan, Jinan 250022, China
2 School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Corresponding author:Chen, N. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:203-209
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:According to the requirements for the compact structure, large torque, fast response and the other performances of driving system in robot, a joint driving system based on electro-hydrostatic actuation (EHA) technology was proposed. Linear motor, pump and load were integrated to provide larger pressure, simple structure and smart configuration. From the analysis in the magnetic circuit, the electromagnetic piston pump model and its equivalent magnetic circuit were developed to describe the magnetic field and its effect caused by piston's movement in electromagnetic piston pump. Based on character integrated in mechanical, electrical and hydraulic, the working process model of driving system was built to explore relations between load and system current. Simulation and experimental results show that the proposed system can supply the maximum load pressure of 2.5 MPa, work stably at 0~2.4 MPa, and reach 1.2 MPa/s in pressure response. The proposed driving system can meet the requirements in the robot joint driving.
Number of references:17
Main heading:Robots
Controlled terms:Electromagnetism - Hydraulics - Hydrodynamics - Joints (structural components) - Magnetic circuits - Magnetic fields - Reciprocating pumps
Uncontrolled terms:Actuation technologies - Compact structures - Driving systems - Electro-hydrostatic actuation - Equivalent magnetic circuit - Fast response - Large torque - Maximum load - Pressure response - Robot joint - Simple structures - Working process
Classification code:731.5 Robotics - 701.2 Magnetism: Basic Concepts and Phenomena - 701 Electricity and Magnetism - 632.1 Hydraulics - 631.2 Hydrodynamics - 618.2 Pumps - 408.2 Structural Members and Shapes
DOI:10.6041/j.issn.1000-1298.2012.05.035
Database:Compendex
17. Accession number:20122715200087
Title:Online compensation for CNC machine thermal error based on optimal weights-based combined modeling
Authors:Yang, Hong1 ; Xiang, Shenghua2 ; Liu, Lixin3 ; Li, Zhaoping3 ; Yin, Guofu1 ; Zhang, Xun1
Author affiliation:1 School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, China
2 Chengdu Aircraft Industry Group Company Limited, Aviation Industry Corporation of China, Chengdu 610091, China
3 Changzheng Machine Tool Group Company Limited, Zigong 643000, China
Corresponding author:Yang, H. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:216-221
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Due to the modeling of CNC machine thermal error has characters of small sample and discrete data, the combined modeling method was presented by integrating grey forecast and least square-support vector machine. According to the experimental data of machine temperature and thermal error, a grey forecast model and a least square-support vector machine were built respectively, and then a combination model was established by using weight coefficients. Taking the increase of the synthetic grey correlation between experimental data and the combined model's forecast value as the aim, optimization of weight coefficients was done. A modeling test was designed on a viaduct gantry machining center, and the result showed that the optimal weights-based combined modeling was prior to grey forecast, least square-support vector machine and multiple linear regressions on accuracy and generalization. Application of the combined model on the online compensation for CNC machine thermal error can effectively reduce the influence of thermal error on machine's precision.
Number of references:12
Main heading:Computer control systems
Controlled terms:Bridges - Forecasting - Machinery - Machining centers - Optimization - Support vector machines
Uncontrolled terms:CNC machine - Grey correlation - Grey forecast - Online compensation - Thermal error
Classification code:921.5 Optimization Techniques - 921 Mathematics - 723.5 Computer Applications - 723 Computer Software, Data Handling and Applications - 603.1 Machine Tools, General - 601 Mechanical Design - 401.1 Bridges
DOI:10.6041/j.issn.1000-1298.2012.05.037
Database:Compendex
18. Accession number:20122715200080
Title:Dynamic recognition of oscillating fruit for harvesting robot
Authors:Lü, Jidong1 ; Zhao, Dean1 ; Ji, Wei1 ; Chen, Yu1 ; Shen, Huiliang1 ; Zhang, Ying1
Author affiliation:1 School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Lü, J. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:173-178 196
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:A kind of dynamic recognition method under the fruit oscillation condition for the harvesting robot was researched in order to resolve the problem of fruit oscillation influence to its recognition and orientation, and further influence to the harvest efficiency of harvesting robot. Firstly, the acquired oscillation fruit was segmented into two parts: fruit image and background image; secondly, the inter-frame difference method and the minimum enclosing rectangle method in horizontal direction were introduced to label dynamic region of the oscillation fruit for the segmented image; thirdly, the oscillation fruit was identified and located. The harvesting oscillation fruit was selected based on the principle of the nearest to the image center when the image had a lot of oscillation fruits. The test result showed that the oscillating fruit was nicely recognized and the recognition time was less than 0.5 s for the most cases under the actual harvesting environment.
Number of references:11
Main heading:Fruits
Controlled terms:Harvesting - Image segmentation - Robots
Uncontrolled terms:Background image - Difference method - Dynamic recognition - Dynamic region - Harvesting robot - Image centers - Inter-frame - Minimum enclosing rectangle - Oscillation - Recognition time - Segmented images
Classification code:731.5 Robotics - 741.1 Light/Optics - 821.3 Agricultural Methods - 821.4 Agricultural Products
DOI:10.6041/j.issn.1000-1298.2012.05.030
Database:Compendex
19. Accession number:20122715200084
Title:Bottleneck index of production logistic in manufacturing shop
Authors:Ling, Lin1 ; Liu, Mingzhou1 ; Tang, Juan2 ; Zhao, Zhibiao1 ; Ge, Maogen1 ; Jiang, Zengqiang1
Author affiliation:1 School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009, China
2 School of Management, Anhui Polytechnic University, Wuhu 241000, China
Corresponding author:Liu, M. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:197-202
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Aiming at the phenomenon of the production logistics bottleneck shifting because of uncertain manufacturing circumstances in manufacturing shop, the bottleneck shifting factors was firstly categorized into capability factor, requirement factor and capability-requirement factor, a digital description of bottleneck shifting factors was provided through time-capability factor, time-requirement factor and quality assurance capability factor to offer data for the research on the coupling mechanism of bottleneck shifting factors. Markov chain was used to describe the state space and transition probability of different bottleneck shifting factors and to establish contribution function with the aim of realizing the quantitative analysis on coupling mechanism of bottleneck shifting factors. Taking contribution degree and quality assurance capability as parameters, the mathematic model of the Bottleneck index was then built to measure the possibility of the manufacturing cell becoming bottleneck and to provide production process control and make the optimization with technical support in the further way. An example of forecasting and monitoring the production logistics bottleneck in one manufacturing shop was given to prove the validation and practicability of the prediction method.
Number of references:15
Main heading:Quality control
Controlled terms:Industrial research - Markov processes - Quality assurance
Uncontrolled terms:Bottleneck index - Bottleneck shifting - Contribution degree - Contribution function - Coupling mechanism - Mathematic model - Prediction methods - Production logistics - Production process control - Shifting factors - State space - Technical support - Transition probabilities
Classification code:901.3 Engineering Research - 913.3 Quality Assurance and Control - 922.1 Probability Theory
DOI:10.6041/j.issn.1000-1298.2012.05.034
Database:Compendex
20. Accession number:20122715200069
Title:Effect of 1-MCP combined with controlled freezing point storage on browning-preventing and freshness-keeping of Mopan persimmon
Authors:Zhang, Peng1 ; Li, Jiangkuo1 ; Chen, Shaohui1 ; Zhang, Ping1
Author affiliation:1 National Engineering and Technology Research Center for Preservation of Agricultural Products, Tianjin 300384, China
Corresponding author:Chen, S. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:108-113
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:In order to explore the effective technique of extending storage period and improving commodity value in Mopan persimmon, effects of 1-MCP treatment and freezing point storage on fruit storage quality, senescence and browning indexes were studied. Results showed that 1-MCP combined with controlled freezing point storage effectively delayed the losses of fruit firmness, vitamin C, total soluble solids, titratable acidity and soluble tannin content, better kept fruit intrinsical nutrition constituents, restrained the rise of MDA, membrance relative conductance and PPO activity during later storage period, fruit senescence process and the occurrence of fruit browning were delayed, and the storage period was extended by about 60 d compared with the control group. Therefore, 1-MCP combined with controlled freezing point storage is an effective integrated freshness-keeping technique for extending storage life.
Number of references:20
Main heading:Freezing
Controlled terms:Fruits - Plants (botany)
Uncontrolled terms:1-MCP - Browning - Control groups - Freezing point - Freshness-keeping - Fruit firmness - Fruit storage - Mopan persimmon - Relative conductance - Senescence process - Storage life - Storage periods - Titratable acidity - Total soluble solids - Vitamin C
Classification code:461.9 Biology - 821.4 Agricultural Products - 822.2 Food Processing Operations
DOI:10.6041/j.issn.1000-1298.2012.05.019
Database:Compendex
21. Accession number:20122715200066
Title:Temperature distribution and gas composition of biomass gasification in downdraft fixed bed gasifier
Authors:Gai, Chao1 ; Dong, Yuping1
Author affiliation:1 Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, Shandong University, Ji'nan 250061, China
Corresponding author:Dong, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:91-96
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The development process of air biomass gasification in a down-draft fixed bed gasifier was analyzed by using multi-dimensional numerical simulation method firstly and was proved to be feasible by the experimental results. Then based on the research above, the influence of the equivalence ratio RER on the temperature distribution over the entire gasifier and gas composition of the biomass gasification were investigated and predicted by numerical simulation, respectively. The results indicate that RER has significant influence on the gasification characteristics and the best range of RER is 0.2~0.28.
Number of references:18
Main heading:Gasification
Controlled terms:Biomass - Computer simulation - Temperature distribution
Uncontrolled terms:Biomass Gasification - Development process - Equivalence ratios - Fixed bed - Gas compositions - Gasification characteristics - Gasifiers - Numerical simulation method
Classification code:525.1 Energy Resources and Renewable Energy Issues - 641.1 Thermodynamics - 723.5 Computer Applications - 802.3 Chemical Operations
DOI:10.6041/j.issn.1000-1298.2012.05.016
Database:Compendex
22. Accession number:20122715200053
Title:Urea dosing map calibration method of open loop control system of diesel engine SCR
Authors:Liu, Chuanbao1 ; Yan, Fuwu1 ; Zhu, Qingshan2 ; Du, Changqing1 ; Hu, Jie1
Author affiliation:1 Department of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
2 Department of Electronic Science and Engineering, Huanghuai Institute, Zhumadian 463000, China
Corresponding author:Yan, F. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:16-21 83
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:In order to quickly calibrate SCR controller, space-falling experiment design was applied to get 130 optimization operation points while developing SCR system for a type of diesel engine, which reduced the experimental workload for two-thirds. The target diesel engine emission model and SCR catalyst model were developed by using neural network based on diesel emission characteristic experimental database and catalyst characteristic experimental database. Multi-objective optimization arithmetic was applied to gain urea dosing map based on SCR catalyst model. ESC (Europe steady cycle) experiment validated that the precision of urea dosing map satisfied the requirement of SCR control.
Number of references:13
Main heading:Diesel engines
Controlled terms:Calibration - Catalysts - Controllers - Experiments - Metabolism - Multiobjective optimization - Neural networks - Urea
Uncontrolled terms:Calibration method - Diesel emission - Diesel engine emissions - Experiment design - Experimental database - Multi objective optimizations (MOO) - Open-loop control systems - Optimization operation - SCR catalysts - SCR technology - Space-falling
Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 921.5 Optimization Techniques - 901.3 Engineering Research - 804.1 Organic Compounds - 804 Chemical Products Generally - 803 Chemical Agents and Basic Industrial Chemicals - 732.1 Control Equipment - 723.4 Artificial Intelligence - 612.2 Diesel Engines - 461.9 Biology
DOI:10.6041/j.issn.1000-1298.2012.05.003
Database:Compendex
23. Accession number:20122715200090
Title:Elimination algorithm for the spike of the measured digital signal based on the racetrack method
Authors:Yan, Chuliang1 ; Duan, Yaoqi1 ; Liu, Yang2 ; Liu, Kege1
Author affiliation: 1 Beijing Aircraft Strength Institute, Beijing 100083, China
2 Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
Corresponding author:Yan, C. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:230-234
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Due to the influence of the electromagnetic field and environment, there are spikes in the measured digital signal of carrier machinery. Eliminating the spike accurately is a key work of the digital signal processing. The algorithm based on the racetrack method of eliminating spike was put forward. This algorithm detects the spike according to the changing trends of the data, distinguishes spike and normal data obviously. Compared with the treatment results with amplitude threshold detection and differential threshold detection, the results show that the algorithm based on the racetrack method of eliminating spike is better than the others.
Number of references:15
Main heading:Algorithms
Controlled terms:Electromagnetic fields - Machinery - Signal processing
Uncontrolled terms:Amplitude threshold - Changing trends - Differential threshold - Digital signals - Signal singularity - The racetrack method
Classification code:601 Mechanical Design - 701 Electricity and Magnetism - 716.1 Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2012.05.040
Database:Compendex
24. Accession number:20122715200083
Title:Multi-field coupling model of embedded giant magnetostrictive components optimization
Authors:Zhang, Lei1 ; Wu, Yijie1 ; Liu, Xiaoliang1 ; Wang, Bin1
Author affiliation:1 State Key Lab. of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
Corresponding author:Wu, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:190-196
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The optimization design model of embedded giant magnetostrictive components (EGMC) was presented with multi-field property of machinery, electric, magnetic and thermal. And the multi-object genetic algorithm was applied to the optimization design of the EGMC. All optimal objects of the model were confirmed by the general design rules and the requirements of non-cylindrical holes in precision processing. The optimal goals of the model were as follows: a suitable flexural rigid of the EGMC, the maximum torsional rigid of the EGMC, the maximum coil efficiency, the maximum magnetic field density inside the coil, the maximum cooling efficiency of the water-cooling cavity, and the maximum magnetic field density in giant magnetostrictive material (GMM) by reducing the magnetic reluctances. The variables needs optimization included the size of GMM, the magnetic permeability of all magnetic materials, the structure of magnetic flux path, coil, and water-cooling cavity. All optimal parameter ranges were determined by application demands. The finest parameters of giant magnetostrictive components were obtained by non-dominated sorting genetic algorithm (NSGA) with space search method, which were proved by the experiments and magnetic field simulations.
Number of references:14
Main heading:Magnetostrictive devices
Controlled terms:Electric properties - Machinery - Magnetic fields - Magnetic flux - Magnetic materials - Magnetic permeability - Optimization - Polybutadienes
Uncontrolled terms:Coil efficiency - Design rules - Giant magnetostrictive - Giant magnetostrictive materials - Magnetic field density - Magnetic field simulation - Magnetic reluctance - Maximum cooling - Multi-field - Multi-field coupling - Multi-object genetic algorithms - Non-cylindrical - Non-dominated sorting genetic algorithms - Optimal parameter - Optimization design - Precision processing - Space search
Classification code:601 Mechanical Design - 701.1 Electricity: Basic Concepts and Phenomena - 701.2 Magnetism: Basic Concepts and Phenomena - 708.4 Magnetic Materials - 815.1.1 Organic Polymers - 921.5 Optimization Techniques
DOI:10.6041/j.issn.1000-1298.2012.05.033
Database:Compendex
25. Accession number:20122715200088
Title:Sphericity error based on mesh search algorithm
Authors:Lei, Xianqing1 ; Song, Hongwei1 ; Xue, Yujun1 ; Li, Jishun2 ; Duan, Mingde1
Author affiliation:1 School of Machatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China
2 Key Laboratory of Modern Mechanical Design and Transmission System, Henan University of Science and Technology, Luoyang 471003, China
Corresponding author:Lei, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:222-225
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:With the definition of the geometry error and the geometric characteristics of sphericity error, a sphericity error evaluation method with the name of mesh search algorithm was presented. The principle of the algorithm was that with the least-square as the initial reference point, and a series of mesh points were collocated around the periphery of the least-square mad self-alignment according to the certain rules, the radius values of all the measured points were calculated by using each mesh point as the ideal center. By comparison and judgment to obtain corresponding evaluation methods (minimum circumscribed sphere (MCS), maximum inscribed sphere (MIS), minimum zone sphere (MZS)). The principle and the realization process of the mesh search algorithm were described in detail. The examples results show that the sphericity error can be evaluated effectively and exactly by using this algorithm.
Number of references:11
Main heading:Spheres
Controlled terms:Geometry - Learning algorithms
Uncontrolled terms:Certain rule - Circumscribed sphere - Error evaluation - Evaluation Method - Geometric characteristics - Geometry errors - Least squares - Measured points - Mesh points - Minimum zone - Realization process - Reference points - Search Algorithms - Self alignment - Sphericity error
Classification code:631 Fluid Flow - 723 Computer Software, Data Handling and Applications - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2012.05.038
Database:Compendex
26. Accession number:20122715200065
Title:Treatment process of anaerobically digested effluent of chicken manure for meeting the discharging standard
Authors:Wang, Feng1 ; Yan, Xiaonan1 ; Yang, Haizhen1
Author affiliation:1 State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China
Corresponding author:Wang, F. (hjwangfeng@#edu.cn)
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:84-90
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:To solve subsequent treating problems of chicken farm biogas project slurry, a research was carried out on treatment processes of anaerobically digested effluent of chicken manure for meeting the discharging standard-a case study of treatment of CSTR fermentation tank effluent of a biogas project. Based on the characteristics of anaerobically digested effluent of chicken manure, bio-chemical treatment combined with physical-chemical process was used to treat the biogas slurry. In addition, effects of three different processes combination method were investigated. First, bench scale experiment was carried out to determine the optimal operation parameters, and then pilot scale devices were introduced to examine the effect of the process. Results showed when using struvite-SBR-coagulation process treating anaerobically digested effluent of chicken manure, CODCr decreased from 9200 mg/L to 280 mg/L, NH4 -N decreased from 3200 mg/L to 36 mg/L, TP decreased from 270 mg/L to 3.3 mg/L, finally the effluent met the standard GB 18596-2001. To remove NH4 -N in chicken manure slurry, pretreatment is essential. Because of inhibition of free ammonia to microorganism, NH4 -N removal rate is less than 30% while using SBR directly treating chicken manure slurry. Biodegradability of anaerobically digested effluent of chicken manure is good, but the amount of refractory CODCr is considerable. Using bio-chemical treatment combined with physical-chemical advanced process can meet the discharging standard with lower cost.
Number of references:13
Main heading:Effluent treatment
Controlled terms:Anaerobic digestion - Animals - Biodegradation - Biogas - Chromium - Coagulation - Manures
Uncontrolled terms:Advanced process - Anaerobic fermentation - Anaerobically digested effluents - Biogas slurry - Chicken manure - Combination method - Free ammonia - N removal - Optimal operation - Physical-chemical process - Pilot scale - Pre-Treatment - Treatment process - Up-to-standard treatment
Classification code:821.5 Agricultural Wastes - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 814 Leather and Tanning - 802.3 Chemical Operations - 543.1 Chromium and Alloys - 822 Food Technology - 522 Gas Fuels - 461.8 Biotechnology - 461 Bioengineering and Biology - 452.4 Industrial Wastes Treatment and Disposal - 452.3 Industrial Wastes - 471 Marine Science and Oceanography
DOI:10.6041/j.issn.1000-1298.2012.05.015
Database:Compendex
27. Accession number:20122715200064
Title:Impeller trim of super-low specific speed centrifugal pump based on numerical simulation of 3D flow field
Authors:Wang, Yang1 ; Liu, Jieqiong1
Author affiliation:1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Wang, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:79-83
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:In order to research the relationship between the size of impeller cutting of super-low specific speed centrifugal pump and the changing pump performance, centrifugal pump IS 50-32-250 was chosen as the research object. By using commercial software Fluent to conduct numerical simulation of three-dimensional flow field, the distributions of pressure and velocity in the impellers and pump bodies under different impeller diameters were calculated. By comparison of calculated results of different diameters, the influence of the size of impeller cutting on pump performance was obtained: when the size of impeller cutting was 0.03, the efficiency raised suddenly; when the size of impeller cutting was 0.09, the efficiency decreased slightly; when the size of impeller cutting was 0.15, the efficiency sudden dropped dramatically. The size of impeller cutting could not be bigger than 0.15 in the practical application, otherwise, the performance of pump dropped dramatically.
Number of references:10
Main heading:Impellers
Controlled terms:Centrifugal pumps - Computer simulation - Efficiency - Flow fields - Pumps - Three dimensional
Uncontrolled terms:3D flow field - Commercial software - Pump performance - Research object - Specific speed - Three dimensional flow field
Classification code:601.2 Machine Components - 618.2 Pumps - 631.1 Fluid Flow, General - 723.5 Computer Applications - 913.1 Production Engineering
DOI:10.6041/j.issn.1000-1298.2012.05.014
Database:Compendex
28. Accession number:20122715200058
Title:Monofractal and multifractal analysis on soil particle distribution in hilly and gully areas of the loess plateau
Authors:Bai, Yiru1 ; Wang, Youke1
Author affiliation:1 College of Resources and Environment, Northwest A and F University, Yangling, Shaanxi 712100, China
Corresponding author:Wang, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:43-48 42
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Monofractal and multifractal analysis were combined to quantitatively investigate soil particle size distribution (PSD) in hilly and gully areas of the Loess Plateau, and the effect of land uses on PSD parameters was analyzed. The results indicated that the PSD showed heterogeneous distribution, had multifractal feature, and multifractal spectrum functions f(α)-α were asymmetrical convex curve. There was no significant relationship between capacity dimension (D0) and soil particle contents. Clay contents were positively correlated with the entropy dimension (D1), correlation dimension (D2) and the width of multifractal spectra Δα (P<0.01). The clay contents, silt contents, sand contents and dimension of silt domain (Dsilt) values were significantly influenced by land uses (P<0.01). The multifractal analysis provided an accurate method to characterize the PSD.
Number of references:18
Main heading:Fractals
Controlled terms:Land use - Particle size analysis - Silt
Uncontrolled terms:Clay content - Correlation dimensions - Entropy dimension - Heterogeneous distributions - Loess Plateau - Monofractal - Multi fractals - Multi-fractal spectrum - Multifractal analysis - Sand content - Silt contents - Soil particle size - Soil particles
Classification code:403 Urban and Regional Planning and Development - 483.1 Soils and Soil Mechanics - 921 Mathematics - 951 Materials Science
DOI:10.6041/j.issn.1000-1298.2012.05.008
Database:Compendex
29. Accession number:20122715200079
Title:Detection method of various obstacles in farmland based on stereovision technology
Authors:Yang, Fuzeng1 ; Liu, Shan1 ; Chen, Liping2 ; Song, Huaibo1 ; Wang, Yuanjie1 ; Lan, Yubin3
Author affiliation:1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
2 College of Information Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
3 College of Agricultural Engineering, Texas A and M University, Texas 77845, United States
Corresponding author:Yang, F. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:168-172 202
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Camera calibration, image acquisition, stereo rectification, stereo match and depth calculation were developed to research a detection method of various obstacles in farmland by using the methods such as Bouguet algorithm, area match, and triangulation and so on. As a result, five different obstacles and their position information in different environments were got, and open computer vision library OpenCV was used to improve the real time property. The experiment showed that the accuracy rate of the obstacle detection reached 96% and the absolute error of depth was maintained within ±30 mm (under 1.5% of the relative error) when the depth was less than 2000 mm, and it takes less than 100 ms to finish a obstacle detection.
Number of references:15
Main heading:Computer vision
Controlled terms:Farms - Obstacle detectors - Stereo vision
Uncontrolled terms:Absolute error - Accuracy rate - Agricultural robot - Binocular stereovision - Camera calibration - Computer vision library - Detection methods - Obstacle detection - Position information - Real-time properties - Relative errors - Stereo match - Stereo rectification
Classification code:681.3 Railroad Signals and Signaling - 723.5 Computer Applications - 821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI:10.6041/j.issn.1000-1298.2012.05.029
Database:Compendex
30. Accession number:20122715200081
Title:Dynamic modeling and analysis for 3P3R universal manipulator in greenhouse
Authors:Jiao, Youzhou1 ; Ding, Pan1 ; Zhao, Daxu2
Author affiliation:1 College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
2 School of Engineering, Zhejiang A and F University, Lin'an 311300, China
Corresponding author:Ding, P. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:179-183
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:A universal type 3P3R manipulator in the facility agriculture environment such as greenhouse was designed. The kinematics and dynamics of the manipulator were analyzed for operating performance and accurately motion control acquired. The Kane's method and screw theory were applied to set up the kinematics and dynamics models, respectively. Then in accordance with the models for the manipulator and the structure of the prototype robot manipulator, the operating performance of the manipulator was studied in the Mathematica environment. The orientation variation of the end-effectors and all joint driven torques of the system were obtained according to the planning motion. The result indicates that the correctness, simplicity and validity of the model are verified. Therefore, the dynamic requirements of the manipulator are satisfied with high dexterity. And this research established a foundation for trajectory planning and accurately motion control.
Number of references:14
Main heading:Manipulators
Controlled terms:Dynamic analysis - Dynamics - Greenhouses - Kinematics - Motion control - Robot applications - Robots
Uncontrolled terms:Dynamic modeling - Facility agricultures - Kane's method - Kinematics and dynamics - Mathematica environment - Operating performance - Prototype robot - Screw theory - Trajectory Planning
Classification code:402.1 Industrial and Agricultural Buildings - 422.2 Strength of Building Materials : Test Methods - 731 Automatic Control Principles and Applications - 931.1 Mechanics
DOI:10.6041/j.issn.1000-1298.2012.05.031
Database:Compendex
31. Accession number:20122715200070
Title:Effects of different concentrations of 1-MCP treatments on freshness of harvested Younai fruits
Authors:Li, Hui1 ; Lin, Hetong1 ; Yuan, Fang1 ; Lin, Yifen1 ; Chen, Yihui2
Author affiliation:1 College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
2 Institute of Postharvest Technology of Agricultural Products, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Corresponding author:Lin, H. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:114-121
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Effects of different concentrations of 1-MCP on freshness of harvested Younai (Prunus salicina Lindl. cv. Younai) fruits were investigated. The harvested fruits were treated with 0, 0.3, 0.6, 0.9, 1.2 μL/L 1-MCP for 12 h, respectively, and then stored at (25±1)°C. During storage, the changes of respiration rate and cell membrane relative leakage rate of fruits, hue angle (h°) value of fruit surface, content of pericarp chlorophyll, fruit firmness, contents of total soluble solids and titratable acid of fruit, healthy fruit percentage, weight loss and organoleptic evaluation of quality of fruit were determined. The results showed that compared with the control fruits, the treatments with 1-MCP lowered respiration rate and respiratory peak, delayed the increase of cell membrane relative leakage rate, inhibited the decrease of hue angle (h°) value of fruit surface, kept higher fruit firmness, and kept higher contents of titratable acid in fruit and chlorophyll in pericarp, retarded the change of apparent color of fruit, and decreased fruit weight loss and fruit decay. Among the 1-MCP treated ones, the fruits treated with 1.2 μL/L 1-MCP could keep best fruit quality. After storage at (25±1)°C for 20 d, the fruits still maintained fresh green with 87% as healthy fruit percentage, crisp and hard flesh, properly sour-sweet taste and rich aroma. It can be concluded that treatment with 1.2 μL/L 1-MCP for 12 h can be used as the optimum condition for maintaining fruit quality and prolonging storage life of Younai fruits during storage at (25±1)°C.
Number of references:20
Main heading:Fruits
Controlled terms:Cell membranes - Chlorophyll - Color computer graphics - Cytology - Harvesting - Quality control - Wood preservation
Uncontrolled terms:1-MCP - Fruit firmness - Fruit quality - Fruit surfaces - Fruit weight loss - Leakage rates - Optimum conditions - Organoleptic evaluation - Respiration rate - Storage life - Titratable acid - Total soluble solids - Weight loss - Younai (Prunus salicina Lindl. cv. Younai)
Classification code:913.3 Quality Assurance and Control - 821.4 Agricultural Products - 821.3 Agricultural Methods - 804.1 Organic Compounds - 803 Chemical Agents and Basic Industrial Chemicals - 723.5 Computer Applications - 461.2 Biological Materials and Tissue Engineering
DOI:10.6041/j.issn.1000-1298.2012.05.020
Database:Compendex
32. Accession number:20122715200073
Title:Performances of far-infrared-assisted heat pump dryer
Authors:Song, Xiaoyong1, 2 ; Chang, Zhijuan3 ; Su, Shuqiang1 ; Deng, Yun1
Author affiliation:1 SJTU-Bor Luh Food Safety Center, Shanghai Jiao Tong University, Shanghai 200240, China
2 Institute of Electric Power, North China University of Water Conservancy and Electric Power, Zhengzhou 450011, China
3 School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
Corresponding author:Deng, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:136-141
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Taking wet towels as the research object, a far-infrared-assisted heat pump dryer was designed and manufactured. Wet towels were dried by using a heat pump (HP) dryer combined with far-infrared radiation (FIR) with the power of 500, 1000 and 2000 W. Changes of drying chamber inlet air temperature, outlet air temperature, inlet air humidity, outlet air humidity, inlet sample temperature, middle sample temperature and outlet sample temperature were all studied. The experiments were conducted under pump drying and far-infrared-assisted drying with different powers. The results showed that compared with the pump drying treatment, the dehumidification capacity was improved effectively, with values of 8.1% to 22.2%. The present data suggested that far-infrared-assisted heat pump drying could shorten the drying time, improve the drying efficiency.
Number of references:21
Main heading:Drying
Controlled terms:Heat pump systems - Humidity control - Infrared radiation
Uncontrolled terms:Drying chambers - Drying efficiency - Drying time - Drying treatment - Far infrared - Far-infrared radiation - Heat pump dryer - Heat pump drying - Heat pumps - Inlet air - Inlet air temperatures - Outlet air - Performance tests - Research object - Sample temperature
Classification code:402 Buildings and Towers - 641.2 Heat Transfer - 642.1 Process Heating - 741.1 Light/Optics
DOI:10.6041/j.issn.1000-1298.2012.05.023
Database:Compendex
33. Accession number:20122715200054
Title:Effect of hydrogen addition on improving low idle speed performance of SI engine
Authors:Wang, Shuofeng1 ; Ji, Changwei1 ; Jiao, Lei2 ; Zhang, Minyue1 ; Zhang, Bo1 ; Huang, Xiaonan1
Author affiliation:1 College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
2 AVL Test Systems Shanghai Co., Ltd., Beijing 100027, China
Corresponding author:Ji, C. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:22-26
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:An experiment was carried out on a four-cylinder spark-ignited (SI) gasoline engine to investigate the effect of hydrogen addition on the engine performance at low idle speed conditions. The engine was run at three idle speeds of 800 r/min, 700 r/min and 600 r/min. At the specified idle speed and stoichiometric conditions, the hydrogen volumetric fraction in the total intake was gradually increased from 0 to about 6%. The experimental results showed that the engine fuel energy flow rate was reduced from 30.8 MJ/h at the idle speed of 800 r/min and a hydrogen volumetric fraction in the intake of 0 to 18.6 MJ/h at the idle speed of 600 r/min and a hydrogen volumetric fraction in the intake of 6.0%. For different idle speeds, the engine combustion duration was shortened, cyclic variation was eased and HC, CO and NOx emissions were decreased with the increase of hydrogen volumetric fraction in the intake. All in all, the addition of hydrogen was effective for enhancing the engine performance at low idle speed conditions.
Number of references:12
Main heading:Hydrogen
Controlled terms:Combustion - Engine cylinders - Engines - Gasoline - Machine design - Particulate emissions - Speed
Uncontrolled terms:CO and NO - Combustion duration - Cyclic variations - Effect of hydrogen - Engine fuels - Engine performance - Gasoline engines - Idle - Idle speed - SI Engines - Volumetric fractions
Classification code:804 Chemical Products Generally - 612.1.1 Internal Combustion Engine Components - 612 Engines - 931.1 Mechanics - 601 Mechanical Design - 521.1 Fuel Combustion - 451.1 Air Pollution Sources - 523 Liquid Fuels
DOI:10.6041/j.issn.1000-1298.2012.05.004
Database:Compendex
34. Accession number:20122715200077
Title:Segmentation of plant lesion image using improved C-V model
Authors:Hu, Qiuxia1, 2 ; Tian, Jie1, 2 ; He, Dongjian1 ; Ning, Jifeng2
Author affiliation:1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
2 College of Information Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
Corresponding author:He, D. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:157-161
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:In view of complex background of lesion images and the difficulty in segmentation, an improved C-V model based on level set and weighted color information was proposed and applied into agricultural lesion image segmentation. The segmentation model of weighted color information based on level set was suitable to different diseases identification and could identify lesion disease automatically. Experimental results show that the proposed model has better property than C-V model, and has many advantages such as anti-noise and scalability properties on 4R-G image model for cucumber pink and 3R-G-B image model for apple rust disease.
Number of references:14
Main heading:Image segmentation
Controlled terms:Color
Uncontrolled terms:Anti noise - Color information - Complex background - Image models - Lesion image - Level Set - Model-based OPC - Plant disease - Rust disease
Classification code:741.1 Light/Optics
DOI:10.6041/j.issn.1000-1298.2012.05.027
Database:Compendex
35. Accession number:20122715200051
Title:Influence factors correlation analysis on the electronic unit pump fuel injection quantity in overall operating conditions
Authors:Tian, Bingqi1 ; Fan, Liyun1 ; Ma, Xiuzhen1 ; Song, Enzhe1 ; Li, Jianqiu2
Author affiliation:1 College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
2 State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
Corresponding author:Tian, B. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:1-10
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Cycle fuel injection quantity fluctuation of electronic unit pump (EUP) determines the coherence and stability of the EUP fuel injection system. The simulation model of EUP was established in the AMESim environment, and the method of simulation experiment was designed by using the design of experiments (DOE) method. The result obtained by the simulation revealed the variation law of correlation under parameters interaction or not respectively in the overall operating conditions. The result shows that the EUP system is a complex nonlinear system. In the overall operating conditions the characteristic parameters such as fuel supply pressure, cam profile velocity, control valve lift, injector opening pressure, and injector needle lift as well as the injector flow coefficient have remarkable correlation with the cycle fuel injection quantity when there is no interaction between parameters. The second order factors under self interaction of parameters are the most remarkable second order factors when the interaction between parameters is considered.
Number of references:13
Main heading:Fuel injection
Controlled terms:Computer simulation - Correlation methods - Design of experiments - Jet pumps
Uncontrolled terms:Cam profile - Characteristic parameter - Complex nonlinear system - Control valves - Correlation analysis - Design of experiments methods - Electronic unit pump - Electronic unit pump (EUP) - EUP - Flow coefficients - Fuel injection systems - Fuel supply pressure - Injection quantity - Injector needle - Operating condition - Second orders - Self-interactions - Simulation experiments - Simulation model
Classification code:521 Fuel Combustion and Flame Research - 618.2 Pumps - 723.5 Computer Applications - 901.3 Engineering Research - 922.2 Mathematical Statistics
DOI:10.6041/j.issn.1000-1298.2012.05.001
Database:Compendex
36. Accession number:20122715200089
Title:Algorithm generating five-axis NC tool-path for unorganized point cloud
Authors:Sun, Dianzhu1 ; Cui, Chuanhui1 ; Kang, Xincai1 ; Wang, Chao1
Author affiliation:1 School of Mechanical Engineering, Shandong University of Technology, Zibo 255091, China
Corresponding author:Sun, D. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:226-229 221
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:An useful generation algorithm of five-axis NC tool-path was proposed, which contained the following steps: first, the cutter-location driver points were marked out based on the shape of point cloud; second, the instantaneous process area was obtained based on the dynamic index of point cloud data; third, the corresponding cutter-location point of each point in the instantaneous process area was obtained and then the cutter location point which has the highest position in the axis direction as the current cutter location point was selected; forth, the limit error was verified according to the adjacent cutter location points, and the precision of tool-path was controlled by the binary interpolation; ultimately, the NC tool-path was generated which met the accuracy requirements. Examples demonstrated that the algorithm can be used for many kinds of tools and can generate the high-quality five-axis NC tool-path for complex data model of unorganized point cloud.
Number of references:11
Main heading:Algorithms
Controlled terms:Motion planning
Uncontrolled terms:Complex data - Cutter location - Dynamic indices - Five-axis - Generation algorithm - High quality - Point cloud - Point cloud data - Tool-path planning - Toolpaths - Unorganized point clouds
Classification code:723 Computer Software, Data Handling and Applications - 723.4 Artificial Intelligence - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2012.05.039
Database:Compendex
37. Accession number:20122715200071
Title:Fresh-keeping and antibacterial technology of citrus fruits based on ethanol extracts from Chinese herbs
Authors:Ren, Yanfang1 ; Liu, Chang1 ; He, Junyu1 ; Wang, Simeng1 ; Zhang, Lanlan1
Author affiliation:1 College of Agriculture, Guizhou University, Guiyang 550025, China
Corresponding author:Ren, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:122-129
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The plant resources with inhibitory effect on postharvest pathogenic fungi from citrus fruits were screened so as to provide the theoretical basis for the development of botanical fungicide. The experiments investigated inhibitory effects in vitro with 30 kinds of ethanol extracts from Chinese herbs against P. italicum, P. digitatum and Alternaria. citri by using mycelial growth rate method, and control effects in vivo and storage effects of Valencia orange with Coptis chinensis ethanol extracts. The results showed that 30 kinds of Chinese herbs ethanol extracts have different effects on mycelial growth of three citrus pathogens, and Coptis chinensis ethanol extracts exhibited the best antifungal effect which reached up to 100%. However, no difference was found between Prochloraz treatment and Coptis chinensis treatment (P>0.05). Minimum inhibitory concentration (MIC) of Coptis chinensis ethanol extracts is 0.025 g/mL. Control test showed that the control effect of Coptis chinensis ethanol extracts against the mixtures of three kinds of spores achieved 90.87% after 10 d of treatment, and there was no significant difference (P>0.05) between Coptis chinensis treatment and Prochloraz treatment. Preservation test indicated that Coptis chinensis ethanol extracts could obviously decrease the incidence of rotting rate and molding of Valencia orange fruits, increase the good fruit rate, and retard the losses of titratable acidity and vitamin C in fruits. Compared with Prochloraz treatment, there was no difference (P>0.05). These results indicated that in vitro experiments, control effect and preservation test exhibited a good antifungal effect with Coptis chinensis ethanol extracts. Therefore, Coptis chinensis ethanol extracts may have a possibility to replace chemical fungicides and a new pesticide can be developed.
Number of references:25
Main heading:Plant extracts
Controlled terms:Citrus fruits - Ethanol - Experiments - Fungi - Fungicides - Medicine - Wood preservation
Uncontrolled terms:Antibacterium - Antifungal effect - Chemical fungicides - Chinese herbs - Citrus - Control tests - Different effects - Ethanol extract - In-vitro - In-vivo - Inhibitory effect - Minimum inhibitory concentration - Mycelial growth - Pathogenic fungi - Postharvest - Theoretical basis - Titratable acidity - Valencia - Vitamin C
Classification code:901.3 Engineering Research - 821.4 Agricultural Products - 821.2 Agricultural Chemicals - 803 Chemical Agents and Basic Industrial Chemicals - 523 Liquid Fuels - 461.9 Biology - 461.6 Medicine and Pharmacology
DOI:10.6041/j.issn.1000-1298.2012.05.021
Database:Compendex
38. Accession number:20122715200057
Title:Joint multifractal of relationship between spatial variability of soil properties in different soil layers
Authors:Liu, Jilong1 ; Ma, Xiaoyi2 ; Fu, Qiang1 ; Zhang, Zhenhua3
Author affiliation:1 Key Laboratory of Water-Saving Agriculture of Universities in Heilongjiang Province, Northeast Agricultural University, Harbin 150030, China
2 College of Hydraulic and Architectural Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
3 Geography and Planning Department, Ludong University, Yantai 264025, China
Corresponding author:Liu, J. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:37-42
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Relationship between spatial variability of soil water content, soil electrical conductivity, sand content, clay content, slit content, fractal dimension of soil particle-size distribution, bulk density and organic matter content in 0~20 cm soil layer and their spatial variabilty in 20~40 cm soil layer at multiple scale was studied with joint multifractal. The results showed that changing ration for spatial variability of slit content and organic matter content was the largest, the one for spatial variability of soil electrical conductivity, clay content and fractal dimension of soil particle-size distribution was the least, and the one for spatial variability of sand content, soil water content and bulk density lay between the two in 20~40 cm soil layer compared with spatial variability of corresponding variables in 0~20 cm soil layer; at multiple scale, relationship between spatial variability of soil water content, bulk density, organic matter content, clay content, sand content, soil electrical conductivity, fractal dimension of soil particle-size distribution and slit content in 0~20 cm soil layer and corresponding soil properties in 20~40 cm soil layer decreased gradually.
Number of references:16
Main heading:Biogeochemistry
Controlled terms:Biological materials - Electric conductivity - Fractal dimension - Light transmission - Organic compounds - Soil moisture
Uncontrolled terms:Bulk density - Clay content - Multi fractals - Multiple scale - Organic matter content - Sand content - Soil electrical conductivity - Soil layer - Soil property - Soil water content - Spatial variability - Spatial variability of soil properties
Classification code:921 Mathematics - 804.1 Organic Compounds - 741.1 Light/Optics - 701.1 Electricity: Basic Concepts and Phenomena - 483.1 Soils and Soil Mechanics - 481.2 Geochemistry - 461.2 Biological Materials and Tissue Engineering
DOI:10.6041/j.issn.1000-1298.2012.05.007
Database:Compendex
39. Accession number:20122715200056
Title:Optimization for elastic connecting plates of electric-hydraulic speed governor
Authors:Li, Yunsong1, 2 ; Chen, Xiaoan1 ; Yang, Enzhi3 ; Wu, Guoxiang1 ; Zhou, Minghong1
Author affiliation:1 State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400030, China
2 Chongqing Radio and TV University, Chongqing 400052, China
3 Chongqing Hongjiang Machinery Co., Ltd., Chongqing 402162, China
Corresponding author:Chen, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:32-36
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Considering the regulating and structural characteristics of electric-hydraulic speed governor, an optimization study on elastic connecting plates was conducted. Firstly, on the basis of accurate force analysis, static analysis was done for the initial design of connecting plates by using the finite element method. Then, the mathematical model of the optimization design was established, which took several geometrical dimensions near the connecting plate's middle rabbets as design variables, larger deformation displacement of the middle part as the optimization objective, and high reliability and good response as the constraint condition. Finally, an optimization analysis was carried out for different configurations by using COSMOSWorks/OPTSTAR, the actual working condition of the connecting plate was simulated and the calculation precision of the finite element method was verified through the experiments. The analysis of the result revealed that after optimization, the connecting plate increased Z-axial deformation displacement of the connecting plate, which can effectively improve the plate's regulating sensitivity and reliability in the system.
Number of references:8
Main heading:Plates (structural components)
Controlled terms:Deformation - Design - Diesel engines - Finite element method - Mathematical models - Optimization - Reliability analysis - Speed regulators
Uncontrolled terms:Calculation precision - Connecting plate - Constraint conditions - Design variables - Force analysis - Geometrical dimensions - High reliability - Initial design - Optimization analysis - Optimization design - Optimization studies - Speed governors - Structural characteristics - Working conditions
Classification code:913 Production Planning and Control; Manufacturing - 732.1 Control Equipment - 612.2 Diesel Engines - 921 Mathematics - 422 Strength of Building Materials; Test Equipment and Methods - 408.2 Structural Members and Shapes - 408 Structural Design - 421 Strength of Building Materials; Mechanical Properties
DOI:10.6041/j.issn.1000-1298.2012.05.006
Database:Compendex
40. Accession number:20122715200076
Title:Rapid detection of cucumber leaves pigments based on near infrared hyper-spectral image technology
Authors:Zou, Xiaobo1 ; Chen, Zhengwei1 ; Shi, Jiyong1 ; Huang, Xiaowei1 ; Zhang, Detao1
Author affiliation:1 School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Zou, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:43
Issue:5
Issue date:May 2012
Publication year:2012
Pages:152-156
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:Rapid detection the content of chlorophyll a, chlorophyll b, β-carotene and lutein on fresh cucumber leaves by using hyper-spectral image and high performance liquid chromatography (HPLC) was done. One hundred and twenty hyper-spectral images of cucumber leaves were collected by near infrared hyper-spectral camera, then using HPLC to accurate detect the content of chlorophyll a, chlorophyll b, β-carotene and lutein. After hyper-spectral images have been corrected, a 50×50 pixels region as region of interest (ROI) was defined. Average spectrum from ROI was extracted and prediction model of partial least squares (PLS) with the content of four pigments was built. In order to advance the stability and prediction accuracy, interval partial least squares (iPLS), backwards interval partial least squares (BiPLS) and synergy interval partial least squares (SiPLS) algorithm was used to select diagnostic bands of each pigments after optimized the number of spectrum interval. The result showed that using BiPLS and SiPLS would get the best PLS model, the best prediction coefficient of chlorophyll a, chlorophyll b, β-carotene and lutein is 0.8257, 0.8134, 0.8116 and 0.8262, respectively.
Number of references:11
Main heading:Chlorophyll
Controlled terms:Chromatography - High performance liquid chromatography - Infrared devices - Mathematical models - Pigments
Uncontrolled terms:Chlorophyll a - Chlorophyll b - Content of chlorophyll - Cucumber leaves - Hyper-spectral cameras - Hyper-spectral images - Interval partial least squares - Interval partial least-squares (iPLS) - Near Infrared - Partial least square (PLS) - PLS models - Prediction accuracy - Prediction model - Rapid detection - Region of interest
Classification code:921 Mathematics - 804.1 Organic Compounds - 804 Chemical Products Generally - 803 Chemical Agents and Basic Industrial Chemicals - 801.2 Biochemistry - 801 Chemistry - 741.3 Optical Devices and Systems
DOI:10.6041/j.issn.1000-1298.2012.05.026
Database:Compendex
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