2010年第41卷第9期共收錄45篇
1. Accession number: 20104113293583
Title: Cycle-by-cycle variations of a DI engine fueled with water emulsion diesel and oxygen enriched intake air
Authors: Zhang, Wei1, 2 ; Shu, Gequn1 ; Peng, Yiyuan2 ; Bi, Kegang2
Author affiliation: 1 State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
2 Faculty of Transportation Engineering, Kunming University of Science and Technology, Kunming 300024, China
Corresponding author: Zhang, W. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 1-7
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 combustion characteristic and cycle-to-cycle variations of a DI engine using oxygen-enriched intake air (the volume fraction of oxygen as follows:21%, 23%, 25% and 30%) and water-diesel fuel emulsions (the amount of water was 0%, 10%, 20%and 30% by volume) were investigated. In-cylinder pressures of 20 combustion cycles and maximum pressures under economic speed and medium load operation were recorded. Consequently, cycle-to-cycle variations of maximum pressures and combustion characteristic were analyzed. The results reveal that, under the conditions of pure diesel, with the increase of oxygen concentration, the maximum cylinder pressures increase, and the cyclic variability of the maximum cylinder pressures and the ignition timing decrease. Using water emulsion diesel, with the increase of volume fraction of water, the ignition timing increases, but it still decreases with the oxygen concentration increasing. When the fraction of water is over 30%, the ignition delay increases dramatically, the in-cylinder burning deteriorates, and the variations of maximum pressure grow.
Number of references: 18
Main heading: Oxygen
Controlled terms: Air intakes - Diesel engines - Diesel fuels - Emulsification - Fuel additives - Ignition - Time measurement - Titration
Uncontrolled terms: Combustion characteristics - Cycle by cycle variation - DI-diesel engine - Oxygen-enriched combustion - Oxygen-enriched intake air - Water emulsion diesel
Classification code: 943.3 Special Purpose Instruments - 804 Chemical Products Generally - 803 Chemical Agents and Basic Industrial Chemicals - 802.3 Chemical Operations - 801 Chemistry - 631.1 Fluid Flow, General - 612.2 Diesel Engines - 524 Solid Fuels - 523 Liquid Fuels - 522 Gas Fuels - 521.1 Fuel Combustion
DOI:10.3969/j.issn.1000-1298.2010.09.001
Database: Compendex
2. Accession number: 20104113293587
Title: Orthogonal test design method based on numerical simulation for non-overload centrifugal pump with complex impeller
Authors: Shen, Yanning1, 2 ; Yuan, Shouqi1 ; Lu, Weigang1 ; Zhang, Jinfeng1 ; Yuan, Jianping1
Author affiliation: 1 Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang 212013, China
2 Sulzer (Dalian) Pumps and Compressors Ltd., Dalian 116600, China
Corresponding author: Shen, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
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: Based on the design requirements of non-overload centrifugal pump, blade outlet angle β2, blade outlet width b2, throat area Ft and the inlet diameter of short blade Di, all of which affects the performance of centrifugal pump with complex impeller were chosen to design nine centrifugal pump models with complex impeller. Numerical simulation of whole flow field based on Fluent was adopted to do orthogonal test, the important order of geometric parameters affect the performance of centrifugal pump with complex impeller. The best design scheme for pump model was acquired. Through the test of specimen of the best design scheme, it demonstrated that the excellent selection by using numerical simulation of whole flow field was non-overload and high efficiency. Orthogonal test based on numerical simulation of whole flow field was verified by the research result.
Number of references: 9
Main heading: Pumps
Controlled terms: Centrifugal pumps - Design - Flow fields - Flow simulation - Hydraulic machinery - Mathematical models - Pumping plants - Testing
Uncontrolled terms: Complex impeller - Design requirements - Design scheme - Geometric parameter - High efficiency - Numerical simulation - Orthogonal test - Orthogonal test design - Outlet angle - Pump models - Research results - Throat areas - Whole flow field
Classification code: 921 Mathematics - 632.2 Hydraulic Equipment and Machinery - 631.1 Fluid Flow, General - 618.2 Pumps - 446 Waterworks - 423.2 Non Mechanical Properties of Building Materials: Test Methods - 408 Structural Design
DOI:10.3969/j.issn.1000-1298.2010.09.005
Database: Compendex
3. Accession number: 20104113293595
Title: Mechanical model of processing bamboo fiber with combing method
Authors: Zhang, Wei1 ; Yao, Wenbin1 ; Li, Wenbin2
Author affiliation: 1 School of Engineering, Zhejiang A and F University, Lin'an 311300, China
2 School of Technology, Beijing Forestry University, Beijing 100083, China
Corresponding author: Zhang, W. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 66-69 117
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: Based on mechanism of processing bamboo fiber by combing method, a concept of average combing strength was put forward. Calculation model of relationship between average combing strength of fiber and fiber length and fineness was established with dynamic principle. The model was analyzed and validated, and the results showed that the model of bamboo fiber length and fineness against average combing strength, roller speed and comb-pins parameters was correct. The values calculated for bamboo fiber length by the model agree well with the experimental values. The length and fineness of bamboo fiber can be calculated by the model.
Number of references: 11
Main heading: Fibers
Controlled terms: Bamboo
Uncontrolled terms: Bamboo fibers - Calculation models - Combing method - Experimental values - Fiber length - Mechanical model - Roller speed
Classification code: 812 Ceramics, Refractories and Glass - 817 Plastics and Other Polymers: Products and Applications - 821.4 Agricultural Products
DOI:10.3969/j.issn.1000-1298.2010.09.013
Database: Compendex
4. Accession number: 20104113293605
Title: Turgor effects on dynamic viscoelasticity of Korla pear tissue
Authors: Wu, Jie1, 2 ; Guo, Kangquan1 ; Gu, Rong1 ; Zhang, Jia1 ; Qi, Chusheng1
Author affiliation: 1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
2 College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832003, China
Corresponding author: Guo, K. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 113-117
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: Viscoelastic properties of Korla pear (Pyrus bretschneideri rehd) tissue osmotically treated in iso-, hypo- or hypertonic sucrose solutions were investigated using oscillatory shear and creep-recovery tests. Results indicate that storage moduli (G′) is much higher than loss moduli (G″) over the entire frequency range. Both G′ and G″ show frequent independent, but increase with the increasing of turgor. In creep testing, the creep compliance responses of low, normal and high turgor tissues were characterized by a generalized Kelvin-Voigt model with six elements. The instantaneous (J0), retarded compliance (J1 and J2) and steady-state fluidity (1/η0) increased as turgor was reduced. By scanning electron microscopy (SEM), many rheological parameters (G″, G′, J0, J1, J2 and 1/η0) show the marked changes among the three turgor levels, which relates with the changes of cells and intercellular spaces due to the turgor manipulation.
Number of references: 15
Main heading: Creep testing
Controlled terms: Creep - Elasticity - Fruits - Scanning electron microscopy - Sugar (sucrose) - Tissue - Viscoelasticity - Viscosity
Uncontrolled terms: Creep compliance - Creep-recovery test - Dynamic viscoelasticity - Frequency ranges - Generalized Kelvin-Voigt model - Intercellular spaces - Korla pear - Loss moduli - ON dynamics - Oscillatory shear - Rheological parameter - SEM - Storage moduli - Sucrose solution - Turgor - Viscoelastic properties
Classification code: 822.3 Food Products - 821.4 Agricultural Products - 741.1 Light/Optics - 951 Materials Science - 631.1 Fluid Flow, General - 422 Strength of Building Materials; Test Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties - 461.2 Biological Materials and Tissue Engineering
DOI: 10.3969/j.issn.1000-1298.2010.09.023
Database: Compendex
5. Accession number: 20104113293625
Title: Fault diagnosis of bearing based on EMD and Duffing oscillator
Authors: Guan, Zhenzhen1 ; Zheng, Haiqi1 ; Yang, Yuntao1 ; Wang, Yan'gang1
Author affiliation: 1 Ordnance Engineering College, Shijiazhuang 050003, China
Corresponding author: Guan, Z. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 214-217
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 detecting bearing fault information, which is easily to be submerged in heavy noise and whose characteristics is nonlinear and non-stationary, a method of fault diagnosis based on empirical mode decomposition (EMD) and Duffing oscillator was put forward. This method decomposed the original signals using EMD to find intrinsic mode function (IMF) of containing the fault information, then the dividing value of force making the Duffing oscillator phase orbit changed was got, the inner motivation force frequency was set to the same frequency as the bearing fault, at last the fault was determined according to the change of Duffing oscillator's phase orbit. The results of experiments show that this method can detect the fault of bearing successfully.
Number of references: 7
Main heading: Bearings (structural)
Controlled terms: Acoustic signal processing - Circuit oscillations - Signal processing
Uncontrolled terms: Bearing - Bearing fault - Chaotic oscillators - Duffing oscillator - EMD - Empirical mode decomposition - Fault diagnosis - Intrinsic mode functions - Nonstationary - Original signal
Classification code: 408.2 Structural Members and Shapes - 703.1.1 Electric Network Analysis - 716.1 Information Theory and Signal Processing - 751 Acoustics, Noise. Sound
DOI: 10.3969/j.issn.1000-1298.2010.09.043
Database: Compendex
6. Accession number: 20104113293602
Title: Detection of strawberry firmness by NIR wavelength selection based on simulated annealing algorithm
Authors: Shi, Jiyong1 ; Yin, Xiaoping1 ; Zou, Xiaobo1 ; Zhao, Jiewen1 ; Ju, Shiguang2
Author affiliation: 1 School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
2 School of Computer and Telecommunication 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: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 99-103
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 improve the accuracy and robust of NIR spectroscopy modules in predicting the firmness of strawberry, simulated annealing algorithm (SAA) was used to select the wavenumbers in NIR spectra. A preprocessing method was also selected to adapt the SAA. Firstly, 150 strawberries were selected to collect NIR spectra. Secondly, preprocessing methods, such as SNV, MSC, 1st order derivation, 2nd order derivation, were used to denoise the NIR spectra of strawberry. Thirdly, 24 wavenumbers were selected by simulated annealing algorithm. At last, partial least square was employed to establish the calibration models of firmness. The calibration model was obtained with the correlation coefficient rc of 0.9342, the root mean square error of calibration of 0.665 N/cm2 and the correlation coefficient rp of 0.9197, the root mean square error of prediction of 0.673 N/cm2. The results show that SAA can improve the robust and accuracy and simplify NIR spectra models.
Number of references: 20
Main heading: Simulated annealing
Controlled terms: Algorithms - Annealing - Block codes - Calibration - Fruits - Infrared devices - Mean square error - Near infrared spectroscopy
Uncontrolled terms: Calibration model - Correlation coefficient - De-Noise - Firmness - Near Infrared - NIR spectroscopy - NIR spectrum - NIR wavelength - Partial least squares - Pre-processing method - Root mean square error of calibrations - Root-mean-square error of predictions - Simulated annealing algorithms - Strawberry - Wave numbers
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 Mathematics - 821.4 Agricultural Products - 741.3 Optical Devices and Systems - 731.1 Control Systems - 723.1 Computer Programming - 723 Computer Software, Data Handling and Applications - 537.1 Heat Treatment Processes
DOI: 10.3969/j.issn.1000-1298.2010.09.020
Database: Compendex
7. Accession number: 20104113293619
Title: Near-infrared spectrum detection of soil organic matter content based on empirical mode decomposition
Authors: Cai, Jianhua1 ; Wang, Xianchun1 ; Hu, Weiwen1
Author affiliation: 1 Information Institute, Hunan University of Arts and Science, Changde 415000, China
Corresponding author: Cai, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 182-186
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 detection of soil organic matter content as an example, this paper discussed the application method of empirical mode decomposition (EMD) for processing soil near-infrared (NIR) differential spectrum using empirical mode decomposition. And the principles and steps of processing were proposed. Then the soil organic matter content was calculated based on the de-noised spectrum, and it was compared with the result from the nine-point smoothing method and wavelet method. Experimental results showed that the SNR was improved from 3 dB to 10 dB, and the root mean square error of between raw signal and de-noised signal were reduced to 0.901 from 2.972. The correlation ratio of the prediction set was improved to 0.9803 from 0.9410, and the RMSEP was reduced to 0.3011 from 0.6702. This improved that EMD is effective to get the pretreatment of NIR spectrum, and the EMD method improves the accuracy of near-infrared spectrum detection of soil organic matter content.
Number of references: 11
Main heading: Signal detection
Controlled terms: Biogeochemistry - Biological materials - Infrared devices - Organic compounds - Power quality - Signal to noise ratio - Soils - Spectroscopy
Uncontrolled terms: De-noising - Detection - Empirical mode decomposition - Near infrared spectra - Signal to noise - Soil organic matter
Classification code: 801.2 Biochemistry - 801 Chemistry - 741.3 Optical Devices and Systems - 804.1 Organic Compounds - 716.1 Information Theory and Signal Processing - 483.1 Soils and Soil Mechanics - 461.2 Biological Materials and Tissue Engineering - 706.1.2 Electric Power Distribution
DOI: 10.3969/j.issn.1000-1298.2010.09.037
Database: Compendex
8. Accession number: 20104113293608
Title: Gelatin properties of okara-containing tofu
Authors: Lu, Xin1 ; Cheng, Yongqiang1 ; Li, Lite1
Author affiliation: 1 College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
Corresponding author: Li, L. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 128-132 142
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: Compared with tofu gelating by CaCl2, the differences between okara-containing tofu and control tofu in composing component, color, texture, microstructure and water holding capacity (WHC) was analyzed. The results show that their color difference is 3.76, which could be discriminated by naked eyes. Okara-containing tofu is darker than control. Because of soybean polysaccharide and cellulose, okara-containing tofu has the higher yield and WHC than control, and the effect of CaCl2 concentration decreases on okara-containing tofu. Due to the interaction of polysaccharide and protein, the okara-containing tofu is in chaos of block microstructure, while the control has an ordered and refined networks structure in SEM. Because polysaccharide interferes with the formation of protein networks, which weakens the gel strength, the okara-containing tofu has the lower value than control in the hardness, springiness and chewiness.
Number of references: 7
Main heading: Color
Controlled terms: Calcium chloride - Colorimetry - Textures
Uncontrolled terms: Color difference - Gel strengths - Higher yield - Naked-eye - Okara-containing tofu - Protein network - SEM - Soybean polysaccharides - Texture analysis - Water holding capacity
Classification code: 741.1 Light/Optics - 804.2 Inorganic Compounds - 933 Solid State Physics - 941.4 Optical Variables Measurements
DOI: 10.3969/j.issn.1000-1298.2010.09.026
Database: Compendex
9. Accession number: 20104113293588
Title: Study of optimal operation method on multiple pump units with adjustable-blade for single pumping station based on decomposition-dynamic programming aggregation method
Authors: Gong, Yi1 ; Cheng, Jilin1 ; Zhang, Rentian1, 2 ; Zhang, Lihua1
Author affiliation: 1 College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China
2 Jiangsu Surveying and Design Institute of Water Resources Co., Ltd., Yangzhou 225009, China
Corresponding author: Cheng, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
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: A decomposition-dynamic programming aggregation method, which was applied to solve the mathematical model of daily optimal operation with adjustable-blade for multiple pump units in single pumping station, has been proposed. Taking minimal daily electric cost as objective function, the water quantity pumped by units as coordinated variable, this model was decomposed into several sub-models of daily optimal operation with adjustable-blade for single pump unit, in which the blade angle was taken as decision variable, the discrete values of water quantity pumped by each unit as state variable, and was solved by means of dynamic programming method. The constructed aggregation model takes water quantity pumped by each pump unit as decision variable, the discrete values of water quantity pumped by pumping station as state variable, and was also solved by dynamic programming method. This method could solve the optimal operation issues for multiple pump units with different types or performance differences in single pumping station. Taking operation of No.4 Huai'an Pumping Station as a study case, a set of optimization results was obtained.
Number of references: 13
Main heading: Dynamic programming
Controlled terms: Decision making - Dynamic models - Hydraulic control equipment - Optimization - Pumping plants - Pumps - Runoff - Water distribution systems
Uncontrolled terms: Adjustable-blade - Aggregation - Multiple pump units - Optimal operation - Pumping stations
Classification code: 921 Mathematics - 912.2 Management - 732.1 Control Equipment - 921.5 Optimization Techniques - 618.2 Pumps - 446 Waterworks - 444.1 Surface Water - 446.1 Water Supply Systems
DOI:10.3969/j.issn.1000-1298.2010.09.006
Database: Compendex
10. Accession number: 20104113293606
Title: Parameters analysis on flow performance in food vacuumizing process
Authors: Han, Zhi1, 2 ; Xie, Jing2 ; Pan, Yingjie2
Author affiliation: 1 School of Naval Architecture and Civil Engineering, Zhejiang Ocean University, Zhoushan 316004, China
2 College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
Corresponding author: Xie, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 118-121
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: A mathematical model was developed for the heat and mass transfer in vacuumizing process. Computational fluid dynamics technology was employed for simulation based on the unsteady model. The simulation results fitted experimental data well. After that, several parameters (pumping speed, free volume, and clapboard etc.) which would affect the flow field were analyzed. The higher the pumping speed is, the lower the pressure limitation is, the lower the minimum air temperature of vacuum chamber is and the more time spent in reaching minimum temperature. The free volume did not affect pressure limitation of the vacuum chamber. The greater the free volume is, the higher the minimum air temperature of vacuum chamber is and the less time spent in reaching minimum temperature. Referring to the pressure limitation and the average temperature of the flow field, the placement of clapboard can be equivalent to the reduction of free volume.
Number of references: 9
Main heading: Mathematical models
Controlled terms: Atmospheric temperature - Computational fluid dynamics - Flow fields - Flow simulation - Free volume - Heat transfer - Mass transfer - Vacuum - Vacuum pumps
Uncontrolled terms: Air temperature - Average temperature - Experimental data - Heat and mass transfer - Numerical simulation - On flow - Parameters analysis - Pumping speed - Simulation result - Simulation-based - Time spent - Vacuum chambers
Classification code: 921 Mathematics - 815 Polymers and Polymer Science - 641.3 Mass Transfer - 641.2 Heat Transfer - 921.6 Numerical Methods - 633.2 Vacuum Equipment - 631 Fluid Flow - 443.1 Atmospheric Properties - 423 Non Mechanical Properties and Tests of Building Materials - 633 Vacuum Technology
DOI: 10.3969/j.issn.1000-1298.2010.09.024
Database: Compendex
11. Accession number: 20104113293603
Title: On-line prediction of intramuscular fat content in pork muscle with visible/near-infrared spectroscopy
Authors: Liao, Yitao1 ; Fan, Yuxia1 ; Wu, Xueqian1 ; Cheng, Fang1
Author affiliation: 1 College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China
Corresponding author: Cheng, F. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 104-107 137
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: Prediction ability of visible/near-infrared spectroscopy for intramuscular fat content assessment on-line was studied. Totally 208 longissimus dorsi muscle samples were collected from different carcasses. Sample spectra were scanned while the samples were moving at the speed of 0.25 m/s. Wavelet transform was employed to eliminate the spectra noise. Partial least squares regression (PLSR) based on the de-noised spectra, combined with different pretreatment methods, was explored to predict intramuscular fat. Daubechies of vanishing moment-6 at decomposition level 6 with the minimax threshold gave good de-noising results. PLSR model based on the de-noised spectra without any pretreatment had poor prediction performances. And through pretreatment, including multiplicative signal correction (MSC), standard normalized variate (SNV) and derivative, the performances are improved. The first derivative spectral in conjunction with SNV yielded the best PLSR model with correlation coefficient of 0.892 and 0.834 in calibration and validation sets, respectively, along with root mean square error of calibration of 0.090 and root mean square error of 0.080 for validation. Results indicate that it is possible to predict intramuscular fat content on-line. However, the best ratio of the standard deviation to the SEP of the validation set (RPD) value was 1.738, and the accuracy and the robustness of the model needed further improvement for practical on-line application.
Number of references: 16
Main heading: Forecasting
Controlled terms: Block codes - Calibration - Infrared spectroscopy - Mean square error - Meats - Muscle - Regression analysis - Wavelet transforms
Uncontrolled terms: Fat contents - Online prediction - Partial least squares regression - Pork - Visible/near-infrared spectroscopy - Wavelet denoising
Classification code: 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941.4 Optical Variables Measurements - 941 Acoustical and Optical Measuring Instruments - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 922.2 Mathematical Statistics - 822.3 Food Products - 723.1 Computer Programming - 461.2 Biological Materials and Tissue Engineering - 921.3 Mathematical Transformations
DOI: 10.3969/j.issn.1000-1298.2010.09.021
Database: Compendex
12. Accession number: 20104113293623
Title: Analysis and design of lifting oil cylinder support with floating support structure based on AMESim and FEM
Authors: Yang, Chunhui1 ; Luo, Weidong1 ; Zhang, Wenming1 ; Wang, Hui1
Author affiliation: 1 Civil and Environment Engineering School, University of Science and Technology Beijing, Beijing 100083, China
Corresponding author: Yang, C. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 205-209 193
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 lifting oil cylinder support with floating support structure was designed by the topological optimization technology. The hydraulic pressure lifting system was simulated by AMESim software, and the load curve and the maximum load of the lifting oil cylinder support were obtained during lifting. Based on the maximum load, the load and its effects on the frame carling were analyzed by FEM. Afterward, the comparison and analysis were done among floating support structure and the other two traditional structures of jointing on bottom steel board structure and carling structure. The analytical results indicate that the lifting oil cylinder support with floating support structure is obviously superior to the other two structures.
Number of references: 11
Main heading: Leakage (fluid)
Controlled terms: Cylinders (shapes) - Finite element method - Ground supports - Hydraulic fluids - Hydraulics - Optimization - Topology - Trucks
Uncontrolled terms: Dump trucks - Finite element analysis - Floating support structure - Hydraulic pressure simulation - Lifting oil cylinder support - Topological optimization
Classification code: 408.2 Structural Members and Shapes - 483 Soil Mechanics and Foundations - 483.1 Soils and Soil Mechanics - 632.1 Hydraulics - 663.1 Heavy Duty Motor Vehicles - 921 Mathematics
DOI: 10.3969/j.issn.1000-1298.2010.09.041
Database: Compendex
13. Accession number: 20104113293589
Title: Experiment on response characteristics of variable-rate continuous spraying system
Authors: Qiu, Baijing1 ; Li, Kun1 ; Shen, Chengjie1 ; Xu, Xichao1 ; Mao, Hanping1
Author affiliation: 1 Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author: Qiu, B. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 32-35 79
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 develop a new type of precision spraying equipment, a set of variable-rate spray system based on electric control valve device as a converter was developed, and the step response characteristics of the system were studied by using experimental methods. The result shows that the maximum rise time is 1 s in the condition of step amplitude ΔQ=0.4, 1.4, 3.4, 3.9, 4.4L/min, which is comparable with variable-rate spray system controlled by changing flow press; the rise time, peak time and overshoot show correlation with the amplitude, which indicates that the system belongs to nonlinear system. So the control design of this type of variable-rate continuous spray system must take nonlinear problems into account.
Number of references: 14
Main heading: Electric control equipment
Controlled terms: Agricultural implements - Analog circuits - Experiments - Linearization
Uncontrolled terms: Control design - Electric control - Experimental methods - Nonlinear - Nonlinear problems - Response characteristic - Risetimes - Spray - Spray systems - Spraying system - Variable rate - Variable rate technology
Classification code: 713 Electronic Circuits - 732.1 Control Equipment - 821.1 Agricultural Machinery and Equipment - 901.3 Engineering Research - 921 Mathematics
DOI: 10.3969/j.issn.1000-1298.2010.09.007
Database: Compendex
14. Accession number: 20104113293591
Title: Experiment on relations of infiltration model parameter in non-sufficient and sufficient water supplies
Authors: Li, Xuezhuan1, 2 ; Fan, Guisheng3
Author affiliation: 1 College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2 Hydraulic Engineering Department, Shanxi Water Conservancy Technical College, Yuncheng 044004, China
3 College of Water Conservancy Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Corresponding author: Fan, G. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 44-49
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: On the basis of the non-sufficient and sufficient water supplied infiltration test of homogenous soil, the infiltration processes for both non-sufficient and sufficient water supplies were analyzed; the correlations of Kostiakov three model parameters for the non-sufficient and sufficient water supplies were established. The result shows that the ponding infiltration process with non-sufficient water supply accords with asymptotic curve of infiltration process with sufficient water supply; the infiltration parameter ratio m increases as the three elements of water supply, namely, intensity, clay content of soil grain and soil bulk density augment, while the parameter ratio m decreases as the two elements of sand content, and moisture content, the steady infiltration rate of non-sufficient water supply equals to steady infiltration rate of sufficient water supply; the infiltration coefficient K1 of non-sufficient water supply equals to the value of the difference between water supplied intensity of water supply and steady infiltration rate.
Number of references: 16
Main heading: Water content
Controlled terms: Geologic models - Seepage - Soil mechanics - Soils - Water supply
Uncontrolled terms: Clay content - Infiltration models - Infiltration parameters - Infiltration process - Moisture contents - Non-sufficient water supply - Sand content - Soil bulk density - Steady infiltration rate - Sufficient water supply - Three models - Three-parameter models
Classification code: 407 Maritime and Port Structures; Rivers and Other Waterways - 441 Dams and Reservoirs; Hydro Development - 444 Water Resources - 446.1 Water Supply Systems - 481.1 Geology - 483.1 Soils and Soil Mechanics
DOI: 10.3969/j.issn.1000-1298.2010.09.009
Database: Compendex
15. Accession number: 20104113293592
Title: Effects of soil column heights on movement of soil water and soil salt during evaporation under perforated plastic mulch
Authors: Gao, Jinfang1 ; Li, Yi1 ; Chen, Shiping1 ; Ma, Xiaoyi1
Author affiliation: 1 Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A and F University, Yangling, Shannxi 712100, 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: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 50-55
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: Through laboratory evaporation experiments of soil column with different heights and mulched at different open-hole ratios, the difference of the distributions of soil water and soil salt and their connections were studied at different heights of soil column. The results showed that, the variations between cumulative evaporation at unit depth and evaporation time fit Gardner's theory for all the soil column heights. There were 2-variable linear functions between cumulative evaporation at unit depth, evaporation time and total soil height. There was relatively good relationship between cumulative evaporation at unit depth and total soil height as well as open-hole ratios. There were also relatively good relationship between cumulative evaporation at unit depth by unit area of film holes and total soil height as well as open hole ratios. The smaller the total soil height, the larger the variation ranges of soil salt content at unit depth and soil salt concentration. The total soil height was a factor that influenced on upward movement of soil salt. Because plastic mulch with open holes restrained soil water evaporation rates and also affected accumulation of soil salt on soil surface, it was effective to decrease soil salt accumulation on soil surface by decreasing open-hole ratios of plastic.
Number of references: 21
Main heading: Soil pollution
Controlled terms: Evaporation - Plastics - Soil moisture - Underwater soils
Uncontrolled terms: Cumulative evaporation of unit depth - Different heights - Evaporation time - Film holes - Linear functions - Open holes - Open-hole ratio - Plastic mulch - Salt concentration - Soil column - Soil salt content - Soil surfaces - Soil water - Soil water and soil salt movement - Soil water evaporation - Upward movement
Classification code: 483.1 Soils and Soil Mechanics - 802.3 Chemical Operations - 817.1 Polymer Products
DOI: 10.3969/j.issn.1000-1298.2010.09.010
Database: Compendex
16. Accession number: 20104113293610
Title: Purification technology of pumpkin polysaccharides with macroporous adsorption resin
Authors: Wang, Libo1 ; Zhao, Yu1 ; Xu, Yaqin1
Author affiliation: 1 College of Science, Northeast Agricultural University, Harbin 150030, China
Corresponding author: Xu, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 138-142
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 select suitable macroporous resin, to improve the purity of pumpkin polysaccharide and to determine purification process parameters, 9 kinds of macroporous resin were chosen to carry out static and dynamic adsorption-desorption experiments. With the indexes of adsorption capacity and elution rate, the suitable macroporous resin was selected and process parameters were confirmed. The results show that D101 -I resin has the best performance of adsorption and desorption effects for purification of pumpkin polysaccharide, the optimum technology parameters are sample concentration of 4.79 mg/mL, sample volume of 3.2 BV, flow rate of 3 BV/h, 25% ethanol for elution, elution velocity of 4 BV/h, elution volume of 3.6 BV. The purity of pumpkin polysaccharide increases from 25.68% to 61.39% by using the above technology.
Number of references: 11
Main heading: Resins
Controlled terms: Adsorption - Desorption - Ethanol - Polysaccharides - Purification
Uncontrolled terms: Adsorption capacities - Elution volumes - Macroporous adsorption resins - Macroporous resin - Process parameters - Pumpkin polysaccharides - Purification process - Sample concentration - Sample volume - Separation and purification - Static and dynamic - Technology parameters
Classification code: 523 Liquid Fuels - 802.3 Chemical Operations - 815.1.1 Organic Polymers
DOI: 10.3969/j.issn.1000-1298.2010.09.028
Database: Compendex
17. Accession number: 20104113293611
Title: Purification of triterpenes in Cyclocarya paliurus leaves by macroporous resins
Authors: Wu, Caie1 ; Fang, Shengzuo1 ; Xu, Lin1 ; Yang, Wanxia1 ; Li, Tingting1 ; Jia, Shaoqian1
Author affiliation: 1 College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China
Corresponding author: Wu, C. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 143-147
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: Purification process of triterpenes in Cyclocarya paliurus by macroporous resins was studied. The suitable macroporous resin was screened, the technological conditions of purification were studied, and the optimum purification processing was obtained by the static adsorption and desorption tests as well as dynamic adsorption and desorption tests. The results show that, in three types of the experimented macroporous resins, D-101 macroporous resin presents the best effect of separation with the adsorption capacity and desorption rate of 57.5 mg/g and 96.51%, respectively; through dynamic adsorption experiments, the optimum sampling rate and mass concentration is 2 BV/h and 1.5 mg/mL respectively; through dynamic desorption experiments, the optimum ethanol content is 50%, with eluting velocity of 2 BV/h. By macroporous resin, the purity of Cyclocarya paliurus triterpenes is 4.1 times higher than crude extracts, the recovery reaches 74.66%. In conclusion, D-101 resin can be applied to purify triterpenes in Cyclocarya paliurus.
Number of references: 14
Main heading: Purification
Controlled terms: Adsorption - Desorption - Ethanol - Resins
Uncontrolled terms: Adsorption capacities - Crude extract - Cyclocarya paliurus - Desorption rate - Desorption tests - Dynamic adsorption - Macroporous resin - Mass concentration - Purification process - Sampling rates - Static adsorption - Technological conditions - Triterpenes
Classification code: 523 Liquid Fuels - 802.3 Chemical Operations - 815.1.1 Organic Polymers
DOI: 10.3969/j.issn.1000-1298.2010.09.029
Database: Compendex
18. Accession number: 20104113293584
Title: Analysis on starting system of ISG diesel engine under low-temperature
Authors: Wei, Changhe1 ; Wang, Zhong1 ; Ye, Feifei1 ; Tang, Ting2 ; Huang, Chenghai2
Author affiliation: 1 School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
2 Wuxi Diesel Works, Wuxi 214026, China
Corresponding author: Wang, Z. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 8-13 65
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 main influencing factors of starting system under low temperature were analyzed, while maximum output power of the ISG motor was determined. According to starting resistance torque, minimum start-up speed, electrical operating characteristics, electric transmission coefficient and thermal effects, the influence of plate structure on battery capacity was also reviewed. The match relationship among starting resistance torque, ISG motor power and storage battery capacitance was summarized, and the changes of starting resistance torque along with ambient temperature and starting speed has been measured. The experiment result shows that as far as the environment temperature decreases by 5°C, starting resistance torque increases by 3-5N·m at above 200r/min, keeping speed constant, starting resistance torque increases by 4~11N·m with every enhanced 50r/min. The first fire speed of ISG diesel engine at -25°C is increased, which is up to more than 350r/min.The starting time is shorter than original diesel engine, and fluctuations in speed is smaller.
Number of references: 12
Main heading: Engines
Controlled terms: Diesel engines - Electric batteries - Electric power supplies to apparatus - Speed - Torque
Uncontrolled terms: Ambient temperatures - Battery capacity - Electric transmission - Environment temperature - First fire - Influencing factor - ISG - Low temperatures - Maximum output power - Motor power - Operating characteristics - Plate structure - Resistance torques - Start-ups - Starting system - Starting systems - Storage battery
Classification code: 421 Strength of Building Materials; Mechanical Properties - 612 Engines - 612.2 Diesel Engines - 702.1 Electric Batteries - 715.2 Industrial Electronic Equipment - 931.1 Mechanics
DOI:10.3969/j.issn.1000-1298.2010.09.002
Database: Compendex
19. Accession number: 20104113293594
Title: Numerical simulation of fluid field for high-speed cutting grinding
Authors: Shen, Peiyu1 ; Zhao, Hao2 ; Zhang, Yuzhong1
Author affiliation: 1 School of Mechanical Engineering, Southern Yangtze University, Wuxi 214122, China
2 Shanghai Shibang Machinery Co., Ltd., Shanghai 201201, China
Corresponding author: Shen, P. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 60-65
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: Based on the analysis of high-speed cutting principle, the numerical simulation of a flow field within the crushing chamber in pulverizing process was performed by CFD technique, and Fluent software, in which RNG k-Ε turbulence model was adopted. The effects of impeller blade shape, blade angle and impeller speed on the flow field were revealed, and the crush velocity, pressure, and shear strain rate were analyzed. The linear relationships between the impeller speed and various parameters were obtained. In case of straight blade impeller with 2° deflection angle the obtained flow field shows the optimal efficiency for cutting crush. The experiments for various materials indicate that the high-speed cutting grinder has the broad prospects with physical adaptability and smashing effect.
Number of references: 13
Main heading: Computer simulation
Controlled terms: Computational fluid dynamics - Computer software - Crushers - Experiments - Flow fields - Fluids - Grinding (machining) - Grinding machines - Grinding mills - Shear strain - Speed - Strain rate - Turbulence models
Uncontrolled terms: Blade - Blade angle - Blade impeller - CFD technique - Crushing chambers - Deflection angles - FLUENT software - Fluid field - High speed cutting - Impeller blades - Impeller speed - Linear relationships - Numerical simulation - Optimal efficiency
Classification code: 931.1 Mechanics - 901.3 Engineering Research - 802.1 Chemical Plants and Equipment - 723.5 Computer Applications - 723 Computer Software, Data Handling and Applications - 631.1 Fluid Flow, General - 606.2 Abrasive Devices and Processes - 422 Strength of Building Materials; Test Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties
DOI: 10.3969/j.issn.1000-1298.2010.09.012
Database: Compendex
20. Accession number: 20104113293598
Title: Evaluation of portable crop nitrogen monitoring instrument based on rice field experiment
Authors: Liu, Haijun1 ; Sun, Chuanfan1 ; Cao, Weixing1 ; Jiao, Xuelei1 ; Xi, Zhiren1 ; Xu, Zhigang1
Author affiliation: 1 Jiangsu Key Laboratory for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Corresponding author: Xu, Z. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 80-84
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: By using self-developed portable instrument for crop nitrogen monitoring, the information of rice canopy reflectance spectra was obtained from the field experiments with two rice varieties and four nitrogen application rates, and the rice plant was sampled from each plot for measurement of leaf nitrogen concentration (LNC) simultaneously. The correlations and the quantitative relationships between LNC and rice canopy reflectance spectra were analyzed, and the performance of portable nitrogen monitoring instrument was evaluated. Results show that its ability in monitoring nitrogen is excellent, and its performance is steady in field condition. Testing the correlations between LNC and canopy reflectance spectrum of four characteristic bands included in the instrument, the correlations in the mono-band of 660 nm, 710 nm and 810 nm are all more than 0.5 with a significance testing (p<0.01). During the all growth stages, the coefficients of determination R2 between LNC and spectral vegetation index (VI) with double-bands are more than 0.7, especially in the flowering and mature stages (R2>0.83). In the whole growth period, the VI are significantly correlated with LNC, such as NDVI(810, 710)and NDVI(710, 546), the determination of coefficients R2 are 0.804 and 0.759.
Number of references: 12
Main heading: Monitoring
Controlled terms: Crops - Experiments - Instrument testing - Instruments - Nitrogen - Reflection - Vegetation
Uncontrolled terms: Field experiment - Monitoring instrument - Nitrogen concentrations - Performance analysis - Rice
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 - 901.3 Engineering Research - 821.4 Agricultural Products - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 804 Chemical Products Generally - 711 Electromagnetic Waves
DOI: 10.3969/j.issn.1000-1298.2010.09.016
Database: Compendex
21. Accession number: 20104113293593
Title: Design and experiment of scheduling irrigation device based on pan evaporation for drip-irrigated cotton under plastic mulch
Authors: Zhang, Jiyang1 ; Duan, Aiwang1 ; Shen, Xiaojun1 ; Yang, Guisen2 ; Song, Jianfeng2 ; Liu, Xiaofei1
Author affiliation: 1 Key Lab for Crop Water Requirement and Regulation, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453003, China
2 Central Irrigation Station of the Xinjiang Production and Construction Corps, Urumqi 830002, China
Corresponding author: Zhang, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 56-59 89
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 simple visual device for scheduling irrigation based on pan evaporation for drip-irrigated cotton under plastic mulch was designed, and an irrigation scheduling model based on field water budget was established. The most suitable plant-pan coefficient for drip-irrigated cotton under plastic mulch and the indicators to schedule irrigation were determined in field conditions, while a revision method for the indicators was proposed under rainfall conditions. The field test proved that it was an effective way to program drip-irrigated cotton irrigation, once marked, there was no need for human intervention beyond checking the position of the water level in relation to the irrigation control marks. The suitable irrigation intervals based on pan evaporation at 140, 75, 50 and 120 mm and irrigation water amount of 0.15, 0.4, 0.7 and 0.25 times of accumulated pan evaporation for seedling stage, bud stage, flowering and bolling stage, and boll opening stage, respectively, could be recommended for drip-irrigation cotton under plastic mulch in the north of Xinjiang area, China.
Number of references: 8
Main heading: Irrigation
Controlled terms: Cotton - Evaporation - Plastics - Scheduling - Water levels - Water supply
Uncontrolled terms: Drip irrigation - Field test - Human intervention - In-field - Irrigated cotton - Irrigation interval - Irrigation scheduling - Irrigation waters - Pan coefficient - Pan evaporation - Plastic mulch - Rainfall condition - Visual devices - Water budget - Xinjiang
Classification code: 912.2 Management - 821.4 Agricultural Products - 821.3 Agricultural Methods - 817.1 Polymer Products - 802.3 Chemical Operations - 614.2 Steam Power Plant Equipment and Operation - 446.1 Water Supply Systems
Database: Compendex
22. Accession number: 20104113293620
Title: Low frequency excited waveforms analysis of an electro-hydraulic vibration exciter using a 2D valve
Authors: Ren, Yan1 ; Ruan, Jian1 ; Jia, Wen'ang1
Author affiliation: 1 Key Laboratory of Mechanical Manufacture and Automation, Zhejiang University of Technology, Hangzhou 310014, China
Corresponding author: Ruan, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 187-193
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: For an electro-hydraulic vibration exciter with a 2D valve, the frequency and the amplitude of the excited waveforms are separately controlled by rotary motion and sliding motion of valve core, respectively. Based on the work principle of an electro-hydraulic vibration system, the mathematical model of an exciter was established. The equations of excited waveforms were solved by using the subsection integration method, and the real excited waveforms were obtained to validate the theoretical analysis result. The corresponding spectrum analysis and the distortion calculation were executed. The results reveal that in low frequency section, the ascent and descent slopes of excited waves demonstrated somewhat asymmetrical because of the changing direction of the elastic load. The extent of asymmetry depends on the axial opening of 2D valve. The waveform distortion is not greater than 9.5% as long as the linear opening of 2D valve is below a critical point.
Number of references: 8
Main heading: Vibration analysis
Controlled terms: Hydraulics - Mathematical models - Safety valves - Spectrum analysis - Spectrum analyzers
Uncontrolled terms: Control valves - Distortion - Electro-hydraulic vibration exciter - Low frequency - Wave forms
Classification code: 943.2 Mechanical Variables Measurements - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 914.1 Accidents and Accident Prevention - 632.1 Hydraulics - 921 Mathematics
DOI: 10.3969/j.issn.1000-1298.2010.09.038
Database: Compendex
23. Accession number: 20104113293607
Title: Properties of venison protein gelatin and mathematical model
Authors: Wang, Shujie1 ; Zhou, Yajun1 ; Su, Dan1 ; Qian, Xi1 ; He, Lianbin1 ; Feng, Zhanrong1
Author affiliation: 1 College of Biological and Agricultural Engineering, Jilin University, Changchun 130025, China
Corresponding author: Zhou, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 122-127
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 effect of heat inducible gelatin of salt soluble protein of venison on water retention property, breakdown strength and viscosity was investigated. The conclusions was as follows: as the amount of NaCl, sodium hexametaphosphate, sodium pyrophosphate and sodium polyphosphate increase, water retention property and breakdown strength increase first and then decrease, viscosity increases gradually; as pH value increases, water retention property first increases strikingly and smoothly then, breakdown strength and viscosity first increase and then decrease; as the temperature increases, water retention property first decreases and increases then, breakdown strength first increases and decreases then, and viscosity first increases and decreases then. The relation between affecting factors and water retention property, breakdown strength and viscosity was discussed through homogeneous experimental design and quadratic regression equations. The effect of factors on water retention property is as follows: the effect of sodium pyrophosphate and temperature is not notable while interaction effect among factors is notable. The influencing factors on breaking strength and viscosity are as follows: odium hexametaphosphate, ionic strength, temperature, pH value, sodium polyphosphate and sodium pyrophosphate, and interaction effect among factors is notable.
Number of references: 13
Main heading: Mathematical models
Controlled terms: Electric breakdown - Ionic strength - pH effects - Proteins - Sodium chloride - Textile blends - Viscosity
Uncontrolled terms: Affecting factors - Breakdown strengths - Breaking strength - Effect of factors - Experimental design - Heat inducible gelatin of salt soluble protein - Hexametaphosphate - Influencing factor - Interaction effect - pH value - Quadratic regression - Sodium hexametaphosphate - Sodium polyphosphate - Sodium pyrophosphate - Soluble proteins - Temperature increase - Venison - Viscosity increase - Water retention properties - Water retention property
Classification code: 819.5 Textile Products and Processing - 804.2 Inorganic Compounds - 804.1 Organic Compounds - 921 Mathematics - 801.4 Physical Chemistry - 701.1 Electricity: Basic Concepts and Phenomena - 631.1 Fluid Flow, General - 801.1 Chemistry, General
DOI: 10.3969/j.issn.1000-1298.2010.09.025
Database: Compendex
24. Accession number: 20104113293599
Title: Research on thermodynamic model of biomass gasification process
Authors: Yan, Guihuan1, 2 ; Sun, Fengzhong1 ; Sun, Rongfeng2 ; Guan, Haibin2 ; Jiang, Jianguo2 ; Xu, Min3
Author affiliation: 1 School of Energy and Power Engineering, Shandong University, Ji'nan 250061, China
2 Energy Research Institute, Shandong Academy of Sciences, Ji'nan 250014, China
3 Key Laboratory for Biomass Gasification Technology of Shandong Province, Ji'nan 250014, China
Corresponding author: Sun, F. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 85-89
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 carbon partial conversion and heat loss of the system, a thermodynamic model of biomass gasification was established based on mass balance, energy balance and chemical equilibrium, which was solved with Newton-Raphson method. The model is validated by comparison with the literature data. The effects of air preheat temperature, moisture content, reaction temperature and equivalence ratio on gasification performance were analyzed by the model. The detailed process of modeling and the calculating results are valuable for the development of the biomass gasification.
Number of references: 17
Main heading: Gasification
Controlled terms: Biomass - Gas generators - Newton-Raphson method - Phase equilibria - Thermodynamic properties
Uncontrolled terms: Biomass Gasification - Chemical equilibriums - Equilibrium models - Equivalence ratios - Literature data - Mass balance - Moisture contents - Preheat temperature - Reaction temperature - Thermodynamic model
Classification code: 522 Gas Fuels - 525.1 Energy Resources and Renewable Energy Issues - 641.1 Thermodynamics - 802.3 Chemical Operations - 921.6 Numerical Methods
DOI: 10.3969/j.issn.1000-1298.2010.09.017
Database: Compendex
25. Accession number: 20104113293586
Title: Spray impingement characteristic of GDI high-pressure swirl injector
Authors: Li, Bo1 ; Li, Yunqing1 ; Wang, Defu1
Author affiliation: 1 Academy of Transportation Science and Engineering, Beihang University, Beijing 100191, China
Corresponding author: Li, B. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 18-21 43
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 characteristics of gasoline spray after wall impingement from a high-pressure gasoline direct injection injector were investigated. To examine the effects of various factors on the impingement development, experiments were conducted at different injection pressures, ambient pressures, wall distances and angles. The impinging spray development, spray height, spray radius, and spray growth rate were measured. Experimental results show that the spray penetration increases with the increase of injection pressure, wall distance and angle. The penetration decreases with the increase of ambient pressure. High injection pressure and low ambient pressure increased the fuel contact area and accelerated the evaporation. The predicted penetrations with the empirical equations in all cases agree with measurements, to a certain extent.
Number of references: 7
Main heading: Gasoline
Controlled terms: Fuel injection - Jet pumps
Uncontrolled terms: Ambient pressures - Contact areas - Empirical equations - Gasoline direct injection - Gasoline spray - High injection - High-pressure swirl injector - Injection pressures - Spray development - Spray impingement - Spray penetration - Swirl injectors - Wall distances - Wall impingement
Classification code: 521 Fuel Combustion and Flame Research - 523 Liquid Fuels - 618.2 Pumps
DOI: 10.3969/j.issn.1000-1298.2010.09.004
Database: Compendex
26. Accession number: 20104113293626
Title: HPC-based dynamics and fatigue simulation on crankshaft system
Authors: Ding, Junhong1 ; Zhang, Xiaoyun2 ; Li, Genguo1
Author affiliation: 1 Shanghai Supercomputer Center, Shanghai 201203, China
2 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Corresponding author: Ding, J. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 218-222
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 large-scale, direct computational model of crankshaft system was established for dynamics simulation and calculation of fatigue life of a crankshaft. The dynamics model was solved by use of high-performance-computing (HPC) technique and explicit finite element method. The calculation result describes the crankshaft dynamics characteristics including strength and distortion in detail. The fatigue life evaluation on crankshaft was accomplished by S-N analysis method straightly utilizing dynamics simulation result and the analytical result based on dynamic stress-time history makes it more reasonable. The computational process and calculation result prove the feasibility and validity of this method for a crankshaft system.
Number of references: 11
Main heading: Crankshafts
Controlled terms: Computer simulation - Dynamics - Fatigue of materials - Finite element method
Uncontrolled terms: Analysis method - Analytical results - Computational model - Computational process - Dynamics characteristic - Dynamics models - Dynamics simulation - Explicit finite element method - Fatigue life - Fatigue life evaluation - FEM - High-performance computing - ON dynamics - Time history
Classification code: 421 Strength of Building Materials; Mechanical Properties - 601.2 Machine Components - 723.5 Computer Applications - 921.6 Numerical Methods - 931.1 Mechanics - 951 Materials Science
DOI: 10.3969/j.issn.1000-1298.2010.09.044
Database: Compendex
27. Accession number: 20104113293590
Title: Effect of saline water continuous irrigation on winter wheat yield and soil physicochemical property
Authors: Wu, Zhongdong1 ; Wang, Quanjiu2
Author affiliation: 1 Institute of Resources and Environment Engineering, Shandong University of Technology, Zibo 255049, China
2 Institute of Water Resources and Hydro-electric Engineering, Xi'an University of Technology, Xi'an 710048, China
Corresponding author: Wang, Q. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 36-43
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: For the sake of rational exploitation and utilization of shallow layer underground saline water in Huang Huai Hai Plain, through the serial saline water farm irrigation experiment during the years of 2003-2005 at Nanpi Ecological Experimental Station of Chinese Academy of Science in Hebei Province, irrigating winter wheat with saline water of 3 g/L, the long term effect of soil salinity, soil solution content, electric conductivity as well as winter wheat yield irrigated with saline water were analyzed. The objective of above works is to establish a rational saline water irrigation program of winter wheat in North China and to supply a theoretical basis for utilization of saline water. The results showed that the salt was cumulated on upper soil layer when the saline water of 3 g/L mineralization degree was utilized continuously, and plant would be subjected to salt stress, especially, in the rainfall deflection crop year. Yield will increase when irrigated with saline water comparing with that of dry farming and the yield is higher with three times irrigations than that of twice. The repeated saline water irrigations should be avoid if the precipitation is small.
Number of references: 19
Main heading: Saline water
Controlled terms: Ecology - Electric conductivity - Irrigation - Soil moisture - Water content
Uncontrolled terms: Chinese Academy of Sciences - Dry farming - Electrical conductivity - Experimental stations - Hebei Province - Long-term effects - North China - Physicochemical property - Salt stresss - Shallow layers - Soil layer - Soil salinity - Soil salt content - Soil solutions - Theoretical basis - Winter wheat - Yield
Classification code: 444 Water Resources - 454.3 Ecology and Ecosystems - 483.1 Soils and Soil Mechanics - 701.1 Electricity: Basic Concepts and Phenomena - 821.3 Agricultural Methods
DOI: 10.3969/j.issn.1000-1298.2010.09.008
Database: Compendex
28. Accession number: 20104113293612
Title: Recognition and location of fruits for apple harvesting robot
Authors: Si, Yongsheng1, 2 ; Qiao, Jun3 ; Liu, Gang2 ; Gao, Rui2 ; He, Bei2
Author affiliation: 1 College of Information Science and Technology, Agricultural University of Hebei, Baoding 071001, China
2 Key Laboratory of MOE on Modern Precision Agriculture System Integration Research, China Agricultural University, Beijing 100083, China
3 Network Centre, China Agricultural University, Beijing 100083, China
Corresponding author: Liu, G. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 148-153
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 apple recognition method with normalized color difference (R-G)/(R G) was presented. The apples in the images taken under different lighting conditions were recognized. Some pretreatments were applied to get contour images. The shape features of the apples were extracted from the contour images based on the method of random circle ring. A matching algorithm based on area feature and epipolar geometry was discussed to position the apples. The apples with similar areas were matched according to the principle of left-right order consistency by calculating the maximum value of cross-correlation function of vertical projections. The experiments results show that the proposed recognition method can eliminate influence of shade, and soil, to a certain extent. The recognition rate reaches 92%. The circle centers and radius are extracted precisely and rapidly based on the method of random circle ring. The errors are less than 2 cm when the measure distance is between 60 cm and 150 cm.
Number of references: 16
Main heading: Feature extraction
Controlled terms: Computer vision - Fruits - Harvesting - Image recognition - Robots - Stereo vision
Uncontrolled terms: Apple - Area feature - Contour image - Cross-correlation function - Epipolar geometry - Harvesting robot - Lighting conditions - Machine vision - Matching algorithm - Maximum values - Measure distance - Normalized color differences - Pre-treatments - Recognition methods - Recognition rates - Shape features - Stereo matching - Vertical projection
Classification code: 716 Telecommunication; Radar, Radio and Television - 723.5 Computer Applications - 731.5 Robotics - 821.3 Agricultural Methods - 821.4 Agricultural Products
DOI: 10.3969/j.issn.1000-1298.2010.09.030
Database: Compendex
29. Accession number: 20104113293609
Title: Effect of oat-seed protein pretreatment by ultrasonic on preparation of ACE inhibitory peptides
Authors: Ma, Haile1 ; Geng, Jingjing1 ; Luo, Lin1 ; Yang, Qiaorong2 ; Zhu, Wenxue3
Author affiliation: 1 School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
2 School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
3 School of Food and Biological Engineering, Henan University of Science and Technology, Luoyang 471003, China
Corresponding author: Ma, H. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 133-137
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 improve enzymolysis technology for preparation of angiotensin-converting enzyme(ACE) inhibiting peptides from oat-seed protein by alcalase protease, ultrasonic pretreatment of oat-seed protein solution was investigated. Based on the inhibitory activity of ACE and degree of hydrolysis (DH), the effects of ultrasonic power, pretreatment time and the on-off time ratio on ultrasonic pretreatment efficacy were studied. The results show that the optimum conditions of ultrasonic pretreatment are 500 W of ultrasonic power, 20 min of pretreatment time and 2s/2s of ultrasonic on-off time ratio. Under the optimum conditions, half inhibiting concentration (IC50) value of ACE decreases from 0.533 mg/mL to 0.299 mg/mL, and the time of enzymolysis reduces from 90 min to 60 min. Experiments also show that ultrasonic pretreatment parameters have made a significant impact on ACE inhibitory activity while no significant effect on the DH. It is verified that the increase of protein hydrophobicity caused by ultrasound is one of main reasons for significant improvement of hydrolysates ACE inhibitory activity.
Number of references: 12
Main heading: Enzymatic hydrolysis
Controlled terms: Peptides - Seed - Ultrasonics
Uncontrolled terms: ACE inhibiting peptides - ACE-inhibitory - ACE-inhibitory activity - Alcalase - Angiotensin-converting enzyme - Degree of hydrolysis - Inhibitory activity - OFF time - Optimum conditions - Pre-Treatment - Protein hydrophobicity - Seed protein - Significant impacts - Ultrasonic power - Ultrasonic pretreatment - Ultrasound
Classification code: 461.9 Biology - 753.1 Ultrasonic Waves - 804.1 Organic Compounds - 821.4 Agricultural Products
DOI: 10.3969/j.issn.1000-1298.2010.09.027
Database: Compendex
30. Accession number: 20104113293597
Title: Design and test on the field soil moisture and compaction acquisition instrument
Authors: Zhang, Shujuan1 ; Qiu, Zhengjun2 ; Wang, Fenghua3 ; Zhao, Huamin1 ; Zhang, Haihong1
Author affiliation: 1 College of Engineering, Shanxi Agricultural University, Taigu 030801, China
2 College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China
3 College of Modern Agricultural Engineering, Kunming Sci-Tech University, Kunming 650224, China
Corresponding author: Zhang, S. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 75-79
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 field information acquisition instrument for positioning, rapid and simultaneous measurement of soil moisture content and compaction was designed. Based on the measurement theory and the software and hardware design of the instrument, the accuracy of measurement was analyzed. 30 soil samples were taken from a tree nursery with the sampling interval of 5 m×5 m. The soil moisture content was measured by the field information acquisition instrument and drying method, respectively. The correlation analysis of the measurement values was carried out and the correlation coefficient is 0.9179. In the same way, 30 samplings of soil compaction in deeps of 10 cm and 20 cm were measured by the field information acquisition instrument and SC900 digital soil compactness instrument. The correlation analysis to the measurement values of tow depths by both methods was carried out and the correlation coefficients were 0.8267 and 0.9245, respectively. The test results showed that the measurement accuracy of acquisition instrument for the soil moisture content and compaction in field satisfied the requirement of agriculture production.
Number of references: 11
Main heading: Soil surveys
Controlled terms: Compaction - Instruments - Measurement theory - Mergers and acquisitions - Moisture determination - Sampling - Soil mechanics - Soil moisture
Uncontrolled terms: Acquisition instrument - Correlation analysis - Correlation coefficient - Design and tests - Drying methods - Field information acquisition - Hardware design - In-field - Measurement accuracy - Moisture contents - Sampling interval - Simultaneous measurement - Soil compaction - Soil compactness - Soil moisture content - Soil sample - Test results - Tree nurseries
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 - 944.2 Moisture Measurements - 922 Statistical Methods - 801 Chemistry - 536.1 Powder Metallurgy Operations - 483.1 Soils and Soil Mechanics - 912 Industrial Engineering and Management
DOI: 10.3969/j.issn.1000-1298.2010.09.015
Database: Compendex
31. Accession number: 20104113293615
Title: On-the-go measurement oriented combined sensor design for soil moisture content and electrical conductivity
Authors: Zeng, Qingmeng1 ; Ma, Daokun1 ; Lin, Jianhui2 ; Schulze Lammers, P3 ; Sun, Yurui1
Author affiliation: 1 College of Information and Electronic Engineering, China Agricultural University, Beijing 100083, China
2 School of Technology, Beijing Forestry University, Beijing 100083, China
3 Institute of Agricultural Engineering, University of Bonn, Bonn 53115, Germany
Corresponding author: Sun, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 163-167
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 combined sensor for soil moisture content (MC) and electrical conductivity (EC) with 4-ring electrode was developed, based on the dielectric theory. The calibration tests with NaCl solution, moist soil sampler and mixed soil sampler were conducted. The results demonstrated that the combined sensor could response the variation of soil MC and EC. By means of analyzing the outputs of 4-ring sensor in mixed soil sampler, statistical prediction models for soil MC and EC were established, respectively.
Number of references: 11
Main heading: Geologic models
Controlled terms: Calibration - Electric conductivity - Mathematical models - Moisture control - Moisture determination - Sensors - Sodium chloride - Soil moisture
Uncontrolled terms: Calibration tests - Combined sensor - Dielectric theory - Electrical conductivity - Moist soil - NaCl solution - Ring electrodes - Sensor designs - Soil electrical conductivity - Soil moisture content - Statistical prediction model
Classification code: 944.2 Moisture Measurements - 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 Mathematics - 804.2 Inorganic Compounds - 801 Chemistry - 701.1 Electricity: Basic Concepts and Phenomena - 483.1 Soils and Soil Mechanics - 481.1 Geology
DOI: 10.3969/j.issn.1000-1298.2010.09.033
Database: Compendex
32. Accession number: 20104113293613
Title: Research on end-effector of apple picking based on new flexible pneumatic actuator
Authors: Yang, Qinghua1 ; Jin, Yinde1 ; Qian, Shaoming1 ; Bao, Guanjun1
Author affiliation: 1 Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Zhejiang University of Technology, Hangzhou 310014, China
Corresponding author: Yang, Q. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 154-158 204
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 new type of end-effector was developed based on flexible pneumatic actuator (FPA), which was designed as a bending joint. The mathematical model of bending joints and end-effector was established with mechanical analysis method, the relationship between pressure and bending capacity, as well as the relationship between pressure and output bending force was analyzed. The mathematical model for end-effector of crawling apple was built. The experimental results show that the force of the end-effector is quite strong and the actuator can grasp apples perfectly and flexibly.
Number of references: 17
Main heading: Mathematical models
Controlled terms: Actuators - Fruits - Pneumatic equipment - Pneumatics
Uncontrolled terms: Apple - Bending capacity - Bending force - Bending joint - Flexible pneumatic actuator - Mechanical analysis - Picking robot
Classification code: 632 Hydraulics, Pneumatics and Related Equipment, and Fluidics - 821.4 Agricultural Products - 921 Mathematics
DOI: 10.3969/j.issn.1000-1298.2010.09.031
Database: Compendex
33. Accession number: 20104113293585
Title: Experiment on harmful emissions of diesel engine with non-thermal plasma assisted catalyst technology
Authors: Wang, Pan1 ; Cai, Yixi1 ; Wang, Jun1 ; Li, Xiaohua1
Author affiliation: 1 School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author: Wang, P. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 14-17
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 non-thermal plasma reactor was designed based upon dielectric barrier discharge theory. The non-thermal plasma assisted catalyst system was established with a NaRh/γAl2O3 catalyst system. The experiment was carried out and the reduction of diesel engine harmful emissions had been investigated with NPAC technology. Results showed that the particulate matter was reduced effectively and the maximum of soot removal efficiency was around 58%. The NOx emission was decreased remarkably by NPAC system. Under the low load conditions, the speed of 3600r/min was corresponding to higher NOx conversion, and the maximum conversion was around 81.5%. Under the high load condition, the speed of 2000r/min showed higher NOx conversion.
Number of references: 13
Main heading: Electric discharges
Controlled terms: Catalysts - Diesel engines - Plasma applications - Plasmas - Removal
Uncontrolled terms: Bench tests - Catalyst system - Catalyst technologies - Dielectric barrier discharges - Harmful emissions - High load - Low load - Non-thermal plasma reactors - Nonthermal plasma - Particulate Matter - Removal efficiencies
Classification code: 612.2 Diesel Engines - 701.1 Electricity: Basic Concepts and Phenomena - 802.3 Chemical Operations - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 932.3 Plasma Physics
DOI: 10.3969/j.issn.1000-1298.2010.09.003
Database: Compendex
34. Accession number: 20104113293622
Title: Variable structure control coupled bending-torsional flexible structure system
Authors: Lü, Yonggui1 ; Chen, Kai1 ; Wei, Yanding2
Author affiliation: 1 School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
2 Institute of Manufacturing Engineering, Zhejiang University, Hangzhou 310027, China
Corresponding author: Lü, Y. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 199-204
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 two-link flexible structure system consisting of a flexible bar and a flexible beam was proposed. The coupled bending-torsional vibration of the flexible structure system was investigated. The dynamic equation of the system was established. A piezoelectric torsional actuator was bonded onto the root of a flexible bar to suppress the torsional vibration of the flexible bar, and a piezoelectric bending actuator was bonded onto the root of the flexible beam to suppress the bending vibration of flexible beam. Experimental research was performed using a sliding mode variable structure control strategy with a saturation unit and a filter. The results show that the controlled system is stable, all the bending and torsional modes are effectively suppressed and the tip vibration of the flexible beam is dramatically attenuated.
Number of references: 9
Main heading: Flexible structures
Controlled terms: Actuators - Elastic waves - Machine vibrations - Piezoelectricity - Spatial variables control - Variable structure control
Uncontrolled terms: Bending vibrations - Controlled system - Coupled bending - Coupled vibrations - Dynamic equations - Experimental research - Flexible bars - Flexible beam - Piezoelectric bending actuators - Sliding mode variable structure control - Torsional modes - Torsional vibration - Two-link
Classification code: 408.2 Structural Members and Shapes - 632 Hydraulics, Pneumatics and Related Equipment, and Fluidics - 701.1 Electricity: Basic Concepts and Phenomena - 731.3 Specific Variables Control - 751.1 Acoustic Waves - 931.1 Mechanics
DOI: 10.3969/j.issn.1000-1298.2010.09.040
Database: Compendex
35. Accession number: 20104113293618
Title: Detection of moisture content in vinegar residue substrate using visible-near-infrared spectroscopy
Authors: Zhu, Yongli1 ; Li, Pingping1 ; Sun, Demin1 ; Mao, Hanping1
Author affiliation: 1 Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author: Li, P. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 178-181
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 develop a method for rapid detection of moisture content in vinegar residue substrate, the spectral data of 69 representative samples were collected by using visible-near-infrared spectroradiometer, and the oven-drying method was applied to obtain the data of these samples' moisture content. Partial least squares regression (PLS) method was selected to perform the calibration models for predicting the moisture content. For determining the number of principal component factors in the PLS model and the method of spectra preprocessing, the model with the lowest prediction residual error sum of square based on cross-validation for the calibration samples set was chosen. The determination coefficient between the predicted and the reference results for the prediction samples set, along with the root mean squared error of prediction (RMSEP), was used as evaluation parameters for the models. The results indicate that the forecast result of spectral data is optimal through the spectra preprocessing method of moving average filter (MAF) and first derivative (FD), with 5 principal component factors. The determination coefficients of the calibration and prediction models are 0.9930 and 0.9901, with root mean squared error of calibration (RMSEC) and prediction (RMSEP) of 0.0676 and 0.0715, respectively. Therefore, visible-near-infrared spectroscopy with PLS method can be used successfully to determine the moisture content of vinegar residue substrates.
Number of references: 8
Main heading: Infrared drying
Controlled terms: Acetic acid - Calibration - Forecasting - Infrared devices - Infrared spectroscopy - Mathematical models - Mean square error - Moisture - Moisture determination - Principal component analysis - Regression analysis - Substrates - Textiles
Uncontrolled terms: Calibration model - Calibration samples - Cross validation - Determination coefficients - Evaluation parameters - First derivative - Moisture contents - Moving average filter - Near Infrared - Organic substrate - Oven drying - Partial least squares regression - PLS models - Prediction model - Principal Components - Rapid detection - Representative sample - Residual error - Root mean squared errors - Spectra preprocessing - Spectral data - Spectro-radiometers - Sum of squares - Vinegar residue - Visible-near infrared spectroscopy
Classification code: 921 Mathematics - 922.2 Mathematical Statistics - 941 Acoustical and Optical Measuring Instruments - 944.2 Moisture Measurements - 941.4 Optical Variables Measurements - 943 Mechanical and Miscellaneous Measuring Instruments - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 819 Synthetic and Natural Fibers; Textile Technology - 804.1 Organic Compounds - 461 Bioengineering and Biology - 642.1 Process Heating - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 801 Chemistry - 801.4 Physical Chemistry
DOI: 10.3969/j.issn.1000-1298.2010.09.036
Database: Compendex
36. Accession number: 20104113293596
Title: Establishment of virtual experiment system platform for agricultural equipment
Authors: Zang, Yu1 ; Zhu, Zhongxiang1 ; Song, Zhenghe1 ; Wang, Meng1 ; Hua, Bo1 ; Mao, Enrong1
Author affiliation: 1 College of Engineering, China Agricultural University, Beijing 100083, China
Corresponding author: Song, Z. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 70-74 127
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 meet the requirements of digital design technology of agricultural equipments, a virtual experiments system platform on agricultural equipments by using MultiGen Creator, Vega Prime software and VC programming language was developed. The whole component of the virtual experiment system platform was introduced, together with its function, framework, and system process. Furthermore, the methods, processes and other key techniques related to the modeling process were discussed as well. The key techniques and difficult points of Vega Prime application were analyzed, such as dynamics simulation of custom model and realization of motion. The experimental results show stable operation of the system with the reliability and validity.
Number of references: 11
Main heading: Three dimensional
Controlled terms: Equipment - Experiments - Virtual reality
Uncontrolled terms: 3-d modeling - Agricultural equipment - Custom models - Digital designs - Dynamics simulation - Key techniques - Modeling process - Multigen creator - Reliability and validity - Scene simulation - Stable operation - System platforms - System process - VC programming language - Vega primes - Virtual experiment system - Virtual experiments
Classification code: 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 901 Engineering Profession - 901.3 Engineering Research
DOI: 10.3969/j.issn.1000-1298.2010.09.014
Database: Compendex
37. Accession number: 20104113293617
Title: Remote collecting and monitoring system of soil moisture content information
Authors: Yang, Shaohui1, 2 ; Yang, Weizhong3 ; Wang, Yiming3
Author affiliation: 1 College of Mechanical Engineering, Jimei University, Xiamen 361021, China
2 Cleaning Combustion and Energy Utilization Research Center of Fujian, Xiamen 361021, China
3 College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
Corresponding author: Yang, W. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 173-177
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 heighten transmission distance and continuous monitoring, a remote collection and monitoring system of soil moisture content information was developed. Its structure and principle were described in detail, and the software and hardware design were given. The system can be charged by solar energy. Wireless transmission and satellite location of sample stations was realized by GSM net and GPS system. The large area real-time soil moisture content state was monitored and the spatial distribution map of soil moisture was drawn by a GIS software. The application results show that the proposed system is efficient. The established remote monitoring system provides reliable and foundation for fighting for drought.
Number of references: 11
Main heading: Monitoring
Controlled terms: Moisture control - Moisture determination - Remote control - Soil moisture - Solar energy
Uncontrolled terms: GIS - GPS - GSM - Remote monitoring - Soil moisture content
Classification code: 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 944.2 Moisture Measurements - 941 Acoustical and Optical Measuring Instruments - 615.2 Solar Power - 483.1 Soils and Soil Mechanics - 731.1 Control Systems
DOI: 10.3969/j.issn.1000-1298.2010.09.035
Database: Compendex
38. Accession number: 20104113293614
Title: Design and experiment of a variable rate fertilization control system
Authors: Liu, Yangchun1 ; Zhang, Xiaochao1 ; Wei, Liguo1 ; Li, Fuchao1 ; Li, Zhuoli1
Author affiliation: 1 State Key Laboratories in Areas of Soil-plant-machine System Technology, Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
Corresponding author: Zhang, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 159-162
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 control technique of variable rate fertilization is introduced. Using single chip microcomputer as CPU, a control system of variable rate fertilization was designed, including force sensor, AD data acquisition system and servo-actuator. An assorted software was designed for selecting data and sending commands. Through test-bed experiment and analysis, the system can complete the control of variable rate fertilization, which has a simple structure, stable operation and high, fertilization precision up to 95%.
Number of references: 11
Main heading: Control theory
Controlled terms: Experiments - Test facilities
Uncontrolled terms: Control techniques - Data acquisition system - Experiment and analysis - Force sensor - Simple structures - Single chip microcomputers - Stable operation - Variable rate fertilization
Classification code: 402.1 Industrial and Agricultural Buildings - 731.1 Control Systems - 901.3 Engineering Research
Database: Compendex
39. Accession number: 20104113293621
Title: Characteristics of electrical energy conversion for dielectric elastomer film
Authors: E, Shiju1 ; Zhu, Xilin1 ; Cao, Jianbo1 ; Zhu, Lihui2 ; Hui, Anfeng1
Author affiliation: 1 College of Technology, Zhejiang Normal University, Jinhua 321004, China
2 School of Mechanical Engineering, Jilin University, Changchun 130025, China
Corresponding author: E, S. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 194-198
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: As a new type of electroactive polymer (EAP), dielectric elastomers can work in both actuator and generator modes. Dielectric elastomers (DE) can achieve good performance in a generator mode, such as high energy density, good impedance matching to many energy sources, low cost, etc. Based on the structure of dielectric elastomers film, the fundamentals of dielectric elastomers, namely fundamentals of alterable capacitance are discussed. The theoretical models of dielectric elastomers film were analyzed, and the conclusion that Maxwell stress effects could be treated as a piezoelectric material with an effective piezoelectric coefficient was drawn. Power energy conversion cycle was analyzed by simulation and experiments, and the experimental curves of output voltages were investigated. The relation between electric field and elastic restoring stress, and its influence on power generating efficiency, were discussed. At last, the mechanical cycle of power generation for dielectric elastomers was determined approximately.
Number of references: 7
Main heading: Electric generators
Controlled terms: Conducting polymers - Dielectric materials - Elastomers - Electric fields - Energy conversion - Experiments - Piezoelectricity - Plastics - Rubber
Uncontrolled terms: Convertion characteristics - Dielectric elastomers - Electrical energy - Electro-active polymers - Energy source - Experimental curves - High energy densities - Impedance matchings - Low costs - Maxwell stress - Output voltages - Piezoelectric coefficient - Simulation - Theoretical models
Classification code: 901.3 Engineering Research - 818.2 Elastomers - 818.1 Natural Rubber - 817.1 Polymer Products - 708.2 Conducting Materials - 708.1 Dielectric Materials - 705.2 Electric Generators - 701.1 Electricity: Basic Concepts and Phenomena - 525.5 Energy Conversion Issues
DOI: 10.3969/j.issn.1000-1298.2010.09.039
Database: Compendex
40. Accession number: 20104113293601
Title: Treatment of Cr-polluted groundwater using a mixed ZVI-compost PRB
Authors: Li, Ya1 ; Zhang, Zengqiang2 ; Shao, Miao1
Author affiliation: 1 College of Resource and Environment, Northwest A and F University, Yangling, Shaanxi 712100, China
2 College of Science, Northwest A and F University, Yangling, Shaanxi 712100, China
Corresponding author: Zhang, Z. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 95-98
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 compost, ZVI, and ZVI-compost as reaction media respectively, the feasibility and effectiveness of Cr-polluted groundwater by PRB were studied. The results showed that the reactor packed with ZVI-compost had a better performance than that with compost or ZVI alone; increasing the amount of compost ZVI could increase the removal effects; moreover the removal effects were little influenced by the time of composting; totle iron of effluent meet the requirement of standards for drinking water quality.
Number of references: 15
Main heading: Composting
Controlled terms: Chemicals removal (water treatment) - Chromium - Effluents - Groundwater - Groundwater pollution - Potable water - Water quality
Uncontrolled terms: Compost - Cr-polluted - Drinking water quality - Permeable reactive barriers - Reaction media - Zerovalent irons
Classification code: 444 Water Resources - 444.2 Groundwater - 452 Municipal and Industrial Wastes; Waste Treatment and Disposal - 452.3 Industrial Wastes - 453.2 Water Pollution Control - 543.1 Chromium and Alloys
DOI: 10.3969/j.issn.1000-1298.2010.09.019
Database: Compendex
41. Accession number: 20104113293604
Title: Effects of hypobaric storage on postharvest physiology and quality of flesh-meltingtextured juicy peach
Authors: Chen, Wenxuan1 ; Gao, Haiyan1 ; Chen, Hangjun1 ; Mao, Jinlin1 ; Song, Lili1 ; Ge, Linmei1
Author affiliation: 1 Institute of Food Processing, Zhejiang Academy of Agricultural Science, Hangzhou 310021, China
Corresponding author: Gao, H. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 108-112
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 effects of hypobaric storage under different pressures on the physiological and quality characteristics of flesh-melting textured juicy peach fruit were studied. The pressures were controlled at (10±5) kPa and (80±5) kPa, respectively with air storage as control. The results indicate that hypobaric storage not only significantly slows down respiratory and ethylene production rates, but also inhibits the decreases of fruit firmness, L*, titratable acids and Vitamin C contents. Hypobaric storage can maintain higher SOD and CAT activities, maintain the stability of membrane system, and retard occurrence of senescence and decay. Hypobaric storage under (10±5) kPa can extend the storage life up to 30 days. It is concluded that the hypobaric storage is an effective method of prolonging the postharvest life of juicy peach fruit.
Number of references: 19
Main heading: Food storage
Controlled terms: Acids - Ethylene - Fruits - Physiology
Uncontrolled terms: Air storage - Ethylene production - Fruit firmness - Hypobaric storage - Juicy peach - Membrane system - Postharvest - Postharvest physiology - Quality - Quality characteristic - Storage life - Titratable acid - Vitamin C
Classification code: 461.9 Biology - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 804.1 Organic Compounds - 821.4 Agricultural Products - 822.1 Food Products Plants and Equipment
DOI: 10.3969/j.issn.1000-1298.2010.09.022
Database: Compendex
42. Accession number: 20104113293616
Title: Temperature effect mechanism and compensation method of EC-5 soil moisture sensor
Authors: Zhang, Rongbiao1 ; Liu, Jun1 ; Zhang, Lei1 ; Yu, Gongjiang1
Author affiliation: 1 School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author: Zhang, R. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 168-172
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 two distinct phenomena appeared in the EC-5 sensor temperature experiment, a theoretical model on variation of soil moisture content with temperature was established according to the influence of temperature on soil permittivity and electrical conductivity. The simulation based on the model shows that the variation tendency of soil moisture content with temperature measured by the EC-5 sensor is closely related to the soil electrical conductivity. Using least squares support vector machine, the sensor temperature compensation function was built and corresponding compensation algorithm was proposed. The results of the experiment indicate that the sensor measurement errors caused by temperature are effectively offset.
Number of references: 12
Main heading: Moisture control
Controlled terms: Computer simulation - Electric conductivity - Geologic models - Measurement errors - Moisture determination - Moisture meters - Permittivity - Sensors - Soil moisture - Soil surveys - Support vector machines - Temperature distribution
Uncontrolled terms: Compensation algorithm - Compensation method - Electrical conductivity - Least squares support vector machines - Sensor measurements - Simulation-based - Soil electrical conductivity - Soil moisture content - Soil moisture sensor - Soil moisture sensors - Soil permittivity - Temperature compensation - Temperature effects - Theoretical models
Classification code: 944.2 Moisture Measurements - 944.1 Moisture Measuring Instruments - 922 Statistical Methods - 801 Chemistry - 723.5 Computer Applications - 723 Computer Software, Data Handling and Applications - 701.1 Electricity: Basic Concepts and Phenomena - 701 Electricity and Magnetism - 641.1 Thermodynamics - 483.1 Soils and Soil Mechanics - 481.1 Geology
DOI: 10.3969/j.issn.1000-1298.2010.09.034
Database: Compendex
43. Accession number: 20104113293624
Title: Computing-algorithm for time-dependent reliability of mechanical structure based on blind number
Authors: Guo, Pengyan1 ; Shi, Boqiang1 ; Xiao, Chengyong1 ; Yan, Yongye1 ; Li, Haipeng2
Author affiliation: 1 School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 R and D Center, CIMC Vehicles Group Co., Ltd., Shenzhen 518067, China
Corresponding author: Guo, P. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 210-213 198
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 blind number theory, the mechanical structure's time-dependent characteristic based on stochastic process was deduced. The uncertain variables in time-dependent stochastic process of mechanical structure were expressed in blind number, and its time-dependent reliability calculation model based on blind number theory was built. And what's more, the corresponding program in LabVIEW language was given, and a free beam's time-dependent reliability was also computed. The result showed that blind number as a kind of numerical tool is very convenient and effective for solving the complicated reliability calculation model.
Number of references: 8
Main heading: Quality assurance
Controlled terms: Number theory - Random processes - Reliability theory - Stochastic models - Stochastic systems
Uncontrolled terms: Blind number - LabViEW - Mechanical structures - Numerical tools - Reliability calculation - Stochastic process - Time dependent reliability - Time-dependent - Time-dependent characteristics - Uncertain variables
Classification code: 913.3 Quality Assurance and Control - 921 Mathematics - 922.1 Probability Theory - 922.2 Mathematical Statistics - 961 Systems Science
DOI: 10.3969/j.issn.1000-1298.2010.09.042
Database: Compendex
44. Accession number: 20104113293627
Title: Cutter location control method for unequal diameter machining of globoidal cam surface
Authors: Ge, Rongyu1 ; Feng, Xianying2 ; Wang, Qingsong3
Author affiliation: 1 School of Mechanical Engineering, University of Jinan, Ji'nan 250022, China
2 School of Mechanical Engineering, Shandong University, Ji'nan 250061, China
3 School of Energy and Power Engineering, Shandong University, Ji'nan 250061, China
Corresponding author: Feng, X. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 223-226 222
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 cutter location compensation method is often used for unequal diameter machining of globoidal cam surface. A new calculation method for the normal error is developed, and a self-adaptive cutter location compensation optimization algorithm is proposed, whose objective is to minimize the maximal normal error. This algorithm can find out the best compensation direction and value by the cutter location optimization for any cam rotation angle and make the cutter location self-adaptive and flexible compensation according to the machining error. The normal error calculation formula has been proved to be valid by an example. A conclusion has been drawn that the radius difference between the cutter and the roller is the best compensation value and the best compensation direction is not fixed. The results show that the correctness and effectiveness of the improved self-adaptive compensation method have been proved and machining errors can be evidently reduced.
Number of references: 9
Main heading: Error compensation
Controlled terms: Cams - Machining - Optimization
Uncontrolled terms: Calculation methods - Compensation method - Cutter location - Cutter-location optimization - Error calculations - Globoidal cam - Machining error - Normal error - Optimization algorithms - Rotation angles - Self-adaptive - Unequal diameter machining
Classification code: 601.3 Mechanisms - 604.2 Machining Operations - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 921.5 Optimization Techniques
DOI:10.3969/j.issn.1000-1298.2010.09.045
Database: Compendex
45. Accession number: 20104113293600
Title: Research on building fuzzy synthetic evaluation system of biomass power generation
Authors: Hu, Yanying1 ; Wang, Shuyang2
Author affiliation: 1 College of Economics and Management, Northeast Forestry University, Harbin 150040, China
2 College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China
Corresponding author: Wang, S. ([email protected])
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 41
Issue: 9
Issue date: September 2010
Publication year: 2010
Pages: 90-94
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: As a new energy project in recent years, biomass power generation is playing a significant role in social and economic life. Recent years, more and more biomass generation projects have been approved, however, some of them are suspending and some are suffering from running troubles. So, it's very important to build an evaluation system for running and managing such projects. An evaluation system based on the fuzzy synthetic evaluation approach and AHP methods was established in this work, which had been testified effective in practical applications and can be taken as an advisable example of starting and running biomass power generation projects.
Number of references: 8
Main heading: Biomass
Controlled terms: Analytic hierarchy process - Hierarchical systems
Uncontrolled terms: AHP method - Biomass generation - Economic life - Energy project - Evaluation system - Fuzzy synthetic evaluation - Power generation projects
Classification code: 525.1 Energy Resources and Renewable Energy Issues - 921 Mathematics - 961 Systems Science
DOI: 10.3969/j.issn.1000-1298.2010.09.018
Database: Compendex
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