2013年第44卷第9期共收錄51篇
1. Accession number:20134116842784
Title:Soil transfer functions of field moisture capacity
Authors:Han, Yonghong1 ; Fan, Guisheng1, 2 ; Kong, Lingchao2
Author affiliation:1 College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2 College of Water Resources 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 for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:62-67
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 field capacity test with different soil structures, soil texture and organic matter content, the dominant factors impacting the soil field capacity were analyzed. With the multiple linear regression model, multiple non-linear regression model and BP model method, the different transfer functions between field capacity and soil physical and chemical properties were set. The result showed that these conventional physical and chemical performance parameters of soils, including dry density, silt content and clay content of soil structure, soil texture and soil organic matter content, all had significant impact on field-water capacity. It was feasible to forecast field specific retention by the different transfer functions, which had higher prediction accuracy (relative error less than 10%) and BP model was the best (relative error was 3.24%).
Number of references:13
Main heading:Soils
Controlled terms:Biogeochemistry - Biological materials - Linear regression - Moisture - Organic compounds - Textures - Transfer functions
Uncontrolled terms:Linear regression models - Moisture capacity - Multiple linear regression models - Organic matter content - Physical and chemical parameters - Soil organic matter contents - Soil physical and chemical properties - Soil transfers
Classification code:922.2 Mathematical Statistics - 921 Mathematics - 804.1 Organic Compounds - 933 Solid State Physics - 801.4 Physical Chemistry - 481.2 Geochemistry - 461.2 Biological Materials and Tissue Engineering - 483.1 Soils and Soil Mechanics
DOI:10.6041/j.issn.1000-1298.2013.09.012
Database:Compendex
2. Accession number:20134116842809
Title:Detection of lettuce quality based on parameters optimization of MSCPSO mixed kernel SVM
Authors:Sun, Jun1 ; Wang, Yan1 ; Jin, Xiaming1 ; Mao, Hanping2
Author affiliation:1 School of Electronic and Information Engineering, Jiangsu University, Zhenjiang 212013, China
2 Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Sun, J. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:209-213 218
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 traditional support vector machine has two faults: low classification accuracy and poor timeliness. In order to obtain support vector machine (SVM) with high accuracy and efficiency, the parameter optimization of SVM with mixed kernels based on mutative scale chaos particle swarm optimization (MSCPSO) was presented. This model was used to predict the growth stage of lettuce leave, which was consist of seedling stage, tillering stage and mature stage, and N content levels of three growth periods respectively. The prediction accuracy achieved to 91.51%, 85.38%, 82.59% and 81.26%. Compared with the traditional particle swarm optimization mixed nuclear SVM classifier and mutative scale chaos particle swarm optimization RBF_SVM classifier, the proposed classifier model showed higher classification accuracy and timeliness.
Number of references:14
Main heading:Support vector machines
Controlled terms:Particle swarm optimization (PSO)
Uncontrolled terms:Chaos particle swarm optimizations - Classification accuracy - Classifier models - Hybrid kernel functions - Lettuce - Parameter optimization - Parameters optimization - Prediction accuracy
Classification code:723 Computer Software, Data Handling and Applications
DOI:10.6041/j.issn.1000-1298.2013.09.037
Database:Compendex
3. Accession number:20134116842808
Title:Leaf area measurement using Android OS mobile phone
Authors:Gong, Aiping1 ; Wu, Wuhao1 ; Qiu, Zhengjun1 ; He, Yong1
Author affiliation:1 College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
Corresponding author:Qiu, Z. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:203-208
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 goal of this study was to develop a method based on Android OS mobile phone by using image processing to rapidly and non-destructively determine leaf area (LA). Software using Java language was used to estimate LA. The steps for processing each image were as follows: image collection, image segmentation, image binarazition, filtering and LA calculation. The proposed method was carried out on triangle of 100 mm2, square of 100 mm2, circle of 314.15 mm2 and five-pointed star of 112.26 mm2 in eight distance ranges by AutoCAD precision drawings. The test result showed that the measured error was in the range of -0.62% to 0.79%. The proposed method was applied to measure different leaves representing varied shapes and sizes, such as tomato, eggplant and maple representing. The measured error was within ±1% compared with type LI-3100 leaf measuring device when the distance between mobile and leaf was 300-600 mm. The picture sizes were 2 560 pixels×1 920 pixels and the measuring accuracy was 0.001 cm2 in this work, which showed the proposed method could measure leaf areas accurately.
Number of references:19
Main heading:Plants (botany)
Controlled terms:Cellular telephones - Computer aided design - Computer software - Image processing - Java programming language - Mobile phones - Pixels - Robots
Uncontrolled terms:Android ossa - Image collections - Leaf area - Leaf area measurements - Measuring accuracy - Measuring device - Precision drawing - Smart Mobile Phones
Classification code:461.9 Biology - 718.1 Telephone Systems and Equipment - 723 Computer Software, Data Handling and Applications - 731.5 Robotics - 741 Light, Optics and Optical Devices
DOI:10.6041/j.issn.1000-1298.2013.09.036
Database:Compendex
4. Accession number:20134116842780
Title:Optimization of vibration characteristics for centrifugal pump volute based on fluid-structure interaction
Authors:Zhang, Desheng1 ; Zhang, Lei1 ; Shi, Weidong1 ; Chen, Bin1 ; Zhang, Hua1
Author affiliation:1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Zhang, D. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:40-45
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 optimize the matching of impeller with extra-thick blades and volute in centrifugal pump, the structure displacement and velocity of different volutes were simulated by two-way coupling fluid-structure interaction method. The numerical results showed that volute was influenced by alternately exciting force due to the flow field interaction between the impeller and the tongue, and vibration displacement and vibration velocity distribution changed cyclically at different time steps. The ratio of volute base circle diameter and impeller diameter D3/D2 had a significant impact on volute vibration. When D3/D2 was less than 1.013, the un-uniform velocity distribution induced by jet-wake in blade outlet leaded to the strong pressure pulsation and vibration of volute. However, the peak-to-peak value of the pressure pulsation was reduced and the vibration of the volute was weakened when the ratio D3/D2 gradually increased. In the design conditions, maximum vibration displacement in case A (D3/D2=1.013) was 4.288×10-6 m, and the maximum vibration speed was 8.547×10-4 m/s. In case C (D3/D2=1.19) was 2.923×10-6 m and 5.253×10-4 m/s respectively. The optimized case B (D3/D2=1.13) had the minimal vibration with the maximum displacement of 2.56×10-6 m and the maximum vibration speed value of 4.823×10-4 m/s. The results also demonstrated the direct relevance between the radial force law and volute vibration characteristics in centrifugal pump.
Number of references:23
Main heading:Centrifugal pumps
Controlled terms:Fluid structure interaction - Impellers - Optimization - Velocity distribution - Vibration analysis
Uncontrolled terms:Different time steps - Maximum displacement - Optimal design - Peak-to-peak values - Structure displacement - Vibration characteristics - Vibration displacements - Volute
Classification code:601.2 Machine Components - 618.2 Pumps - 921.5 Optimization Techniques - 931.1 Mechanics - 943.2 Mechanical Variables Measurements
DOI:10.6041/j.issn.1000-1298.2013.09.008
Database:Compendex
5. Accession number:20134116842773
Title:Thermodynamics analysis of hydrogen production in vehicle DME steam reforming reaction system
Authors:Zheng, Zhaolei1 ; Li, Shanliang1
Author affiliation:1 Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China
Corresponding author:Zheng, Z. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:1-6
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 hydrogen production in vehicle dimethyl ether (DME) steam reforming reaction system, the thermodynamic efficiency of reforming reaction system was analyzed. The change of chemical equilibrium constant in main reactions with temperature was confirmed. The effects of steam-to-DME ratio, temperature and pressure on equilibrium were studied. The results indicated that DME-reformed gas increased low heat value by 15.45%. DME had a high conversion when the temperature was higher than 473 K and steam-to-DME ratio was more than 2, and the equilibrium concentration was close to zero. The main components of reformed gas were H2, CO and CO2. The content of H2 showed the most, and the largest concentration was 72%. With high temperature and low steam-to-DME, carbon in DME would be converted to CO. With low temperature and high steam-to-DME, carbon in DME would be converted to CO2. Pressure had little effect on the reaction equilibrium concentration.
Number of references:13
Main heading:Steam reforming
Controlled terms:Carbon - Carbon dioxide - Equilibrium constants - Fuels - Hydrogen - Hydrogen production - Steam - Temperature - Thermoanalysis - Thermodynamics
Uncontrolled terms:Chemical equilibrium constant - Dimethyl ethers - Equilibrium concentration - Reaction equilibrium - Temperature and pressures - Thermo dynamic analysis - Thermodynamic efficiency - Thermodynamics analysis
Classification code:522 Gas Fuels - 641.1 Thermodynamics - 801 Chemistry - 802.2 Chemical Reactions - 804 Chemical Products Generally - 804.2 Inorganic Compounds
DOI:10.6041/j.issn.1000-1298.2013.09.001
Database:Compendex
6. Accession number:20134116842777
Title:Flame characteristics of biodiesel in industrial furnace based on image processing
Authors:Jiang, Shaojian1 ; Zhong, Wei1 ; Zhang, Changliang1 ; Wang, Chuanyu1
Author affiliation:1 School of Energy Science and Engineering, Central South University, Changsha 410083, China
Corresponding author:Jiang, S. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:24-29
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 flame characteristics of biodiesel burning in industrial furnace were studied. The volume, shape, structure of flame and length were analyzed based on image processing by using high-speed photography method. The experimental results showed that with the increase of excess air coefficient α, the volume of flame gradually decreased and the flame deformation was more and more serious. With the increase of atomization pressure p, the volume of flame first increased and then decreased. The flame deformation was more and more serious, and the flame structure was more and more fragmented. Through the calculation, the range of the actual length of the flame of 0.2 s was very large, which emerged a sudden increase and drop rule, existed a "taking off the flame" process. The flame length became inversed to the excess air coefficient α. Along with the decrease of the atomization pressure p, the curve of flame length changed gently.
Number of references:16
Main heading:Deformation
Controlled terms:Atomization - Biodiesel - High speed photography - Image processing - Industrial furnaces
Uncontrolled terms:Atomization pressure - Excess air coefficient - Flame characteristics - Flame length - Flame structure
Classification code:802.3 Chemical Operations - 742.1 Photography - 741 Light, Optics and Optical Devices - 642.2 Industrial Furnaces and Components - 523 Liquid Fuels - 422 Strength of Building Materials; Test Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties
DOI:10.6041/j.issn.1000-1298.2013.09.005
Database:Compendex
7. Accession number:20134116842822
Title:Line vibratory feeder drived by circular piezoelectric vibrator
Authors:Su, Jiang1, 2 ; Yang, Zhigang3 ; Zhang, Changjian1 ; Shen, Yanhu1
Author affiliation:1 Institute of Mechanical Science and Engineering, Jilin University, Changchun 130025, China
2 Zhuhai College, Jilin University, Zhuhai 519041, China
3 Institute of Chain Transmission, Jilin University, Changchun 130025, China
Corresponding author:Yang, Z. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:289-292
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:To meet the requirement that the light, thin and small product was conveyed steadily in modern automation product line, a new type line vibratory feeder driven by circular piezoelectric vibrator was proposed. The structure model of the vibratory feeder was designed. The working principle of the vibratory feeder was analyzed. The dynamic model of the vibratory feeder was established. Furthermore, a prototype of the vibratory feeder was developed and tested. The relations among voltage, amplitude and frequency were explored based on the test. The experimental results show that the new type vibratory feeder is characterized by less electrical energy consumption, lower work noise and more stable feeding compared with electromagnetic vibratory feeder, and it has faster feeding rate compared with the rectangular bimorph piezoelectric vibratory feeder.
Number of references:10
Main heading:Feeding
Controlled terms:Dynamic models - Energy utilization - Piezoelectricity - Vibrators
Uncontrolled terms:Automation products - Bimorph - Electrical energy consumption - Electromagnetic vibratory - Feeding rate - Piezoelectric vibrators - Structure modeling - Vibratory feeders
Classification code:525.3 Energy Utilization - 691.1 Materials Handling Equipment - 691.2 Materials Handling Methods - 701.1 Electricity: Basic Concepts and Phenomena - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2013.09.050
Database:Compendex
8. Accession number:20134116842796
Title:Soluble solids content detection of postharvest apples based on frequency spectrum of dielectric parameters
Authors:Guo, Wenchuan1 ; Shang, Liang1 ; Wang, Minghai1 ; Zhu, Xinhua1
Author affiliation:1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
Corresponding author:Guo, W. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:132-137
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:Based on frequency spectrum of permittivities from 10 MHz to 4 500 MHz of intact postharvest Fuji apples during 21 weeks storage, BP network model and support vector regression (SVR) model were applied to predict SSC. Effects of the prediction models using full frequency (FF), principal component analysis (PCA) and successive projection algorithm (SPA) were compared and evaluated. The results showed that PCA-SVR gave the best result rather than PCA-BP and SPA-BP. The predicted correlation coefficient of PCA-SVR was 0.883 and the root mean square error (RMSE) was 0.552. The effect of PCA-BP was a little worse than PCA-SVR. The RMSE of the model established by SPA was generally smaller than by other methods, and the predicted correlation coefficient of the models established by PCA was generally higher. The research offered some useful technologies in developing nondestructive sensors for fruits' soluble solids content based on frequency spectrum of dielectric parameters.
Number of references:21
Main heading:Fruits
Controlled terms:Backpropagation - Dielectric properties - Mean square error - Principal component analysis - Spectroscopy
Uncontrolled terms:Apples - BP networks - Correlation coefficient - Nondestructive sensors - Root mean square errors - Soluble solids content - Successive projection algorithms - Support vector regression (SVR)
Classification code:701 Electricity and Magnetism - 723.4 Artificial Intelligence - 801 Chemistry - 821.4 Agricultural Products - 922.2 Mathematical Statistics
DOI:10.6041/j.issn.1000-1298.2013.09.024
Database:Compendex
9. Accession number:20134116842823
Title:Study of vibration decreasing and energy saving of rotary grading screen
Authors:Yuan, Rui1, 2 ; Sun, Yu1 ; Li, Qingkai1, 2 ; Wu, Kai1 ; Chen, Zhengjun2 ; Xu, Jingjing2
Author affiliation:1 School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2 Research Institute of Jiangsu Muyang Group, Yangzhou 225127, China
Corresponding author:Sun, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:293-298
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 solve the high vibration and energy dissipation of rotary grading screen, the system energy of the rotary grading screen in operation process was analyzed. The total energy of system in operation process was periodic, and it caused the high vibration and energy dissipation of the rotary grading screen. A method based on the constant total energy of system was proposed and the elastic component was disposed. It transformed dissipated energy into elastic potential energy and transformed elastic potential energy into driving energy so as to remain the constant total energy of system. The experimental results showed that the proposed method saved energy consumption by 21.71% and decreased vibration by 30.89%. It had better effect in energy saving and vibration decreasing.
Number of references:15
Main heading:Grading
Controlled terms:Energy conservation - Energy dissipation - Energy utilization - Potential energy
Uncontrolled terms:Dissipated energy - Elastic components - Elastic potential energy - Operation process - System energy - Total energy - Vibration decreasing
Classification code:525 Energy Management and Conversion - 913.3 Quality Assurance and Control - 931.1 Mechanics
DOI:10.6041/j.issn.1000-1298.2013.09.051
Database:Compendex
10. Accession number:20134116842792
Title:K-ZSM-5 zeolite production using rice husk ash from biomass gasfiers
Authors:Lang, Lin1 ; Wang, Fengchan1 ; Zhang, Chao1 ; Yin, Xiuli1 ; Wu, Chuangzhi1
Author affiliation:1 Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Corresponding author:Yin, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:107-113
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The rice husk ash (RHA) from biomass gasifiers was hydrothermally reacted with KOH solution to obtain the RHA ludox, which was used to synthesize K-ZSM-5 zeolite by hydrothermal crystallization. The effect of hydrothermal reaction time on the Si dissolving rate was investigated, and the complex composition of the RHA ludox was analyzed as well. The effects of template types, Si/Al molar ratio, crystallization temperature and time on the nucleation and growth of K-ZSM-5 zeolite in the complex RHA synthesis system were studied. The as-synthesized samples were characterized by XRD, SEM, ICP, TG, N2 adsorption-desorption and other means. The results showed that the structural directing agents with strong template effect were necessary to synthesize K-ZSM-5 zeolite directly using the RHA ludox. The zeolite crystals could not be prepared by the weak organic template as ethanol, however, using little TPABr strong template, the K-ZSM-5 zeolite crystals could be synthesized with a certain range of the Si/Al molar ratio. But there were some disadvantages such as the narrow adjustable range of synthesis solution, irregular crystal shape, large grain size, high synthesis temperature, long reaction time, and so on. It was also found that the calcination methods had great influence on the pore structure of large K-ZSM-5 products. It was easy to form deposited carbon over the zeolite crystals that were directly calcined at 550°C. To obtain pure K-ZSM-5 products, it must be calcined at 350°C for 3 h before high-temperature calcination at 550°C.
Number of references:25
Main heading:Calcination
Controlled terms:Hydrothermal synthesis - Zeolites
Uncontrolled terms:Adsorption desorption - Crystallization temperature - High-temperature calcination - Hydrothermal crystallization - Nucleation and growth - Rice husk ash - Structural-directing agents - Synthesis temperatures
Classification code:802.2 Chemical Reactions - 802.3 Chemical Operations - 804.2 Inorganic Compounds
DOI:10.6041/j.issn.1000-1298.2013.09.020
Database:Compendex
11. Accession number:20134116842789
Title:Titration method for total inorganic carbon and volatile fatty acids determination in anaerobic digestion
Authors:Liu, Fang1 ; Zhang, Wanqin1 ; Wu, Shubiao1 ; Pang, Changle1 ; Chen, Li1 ; Dong, Renjie1
Author affiliation:1 Bio-Energy Engineering and Low Carbon Technology Laboratory, China Agricultural University, Beijing 100083, China
Corresponding author:Wu, S. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:91-96 106
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 obtain a simple and reliable method for volatile fatty acid concentration and bicarbonate alkalinity, Nordmann titration method and instrument method were chosen in lab-scale CSTRs for chicken manure. The accuracy was compared and correction of titration method was made. The result showed that the Nordmann titration method and instrument method for VFA and TIC concentration determination were significant difference, and the mean relative error was more than 50%. After correction, the mean relative error was significantly reduced and lower than 10% when the organic load was higher than 4.0 g/(L·d). It means that the modified titration method could achieve more simple and accurate determination of VFA and TIC concentration. Also, as the total VFA concentration measured by the modified titration method had a good correlation with the acetic acid concentration measured by gas chromatography, the modified titration method could estimate the acetic acid concentration. Compared to pH value, VFA/TIC ratio measured by modified titration method could realize early warning of acidification.
Number of references:21
Main heading:Volatile fatty acids
Controlled terms:Acidification - Anaerobic digestion - Gas chromatography - pH - Titration
Uncontrolled terms:Acetic acid concentration - Chicken manure - Concentration determination - Early warning - Good correlations - Mean relative error - Reliable methods - Total inorganic carbon
Classification code:452.4 Industrial Wastes Treatment and Disposal - 801 Chemistry - 801.1 Chemistry, General - 804.1 Organic Compounds - 822.2 Food Processing Operations
DOI:10.6041/j.issn.1000-1298.2013.09.017
Database:Compendex
12. Accession number:20134116842778
Title:Effect of CO2 dilution on combustion and emission characteristics of biogas
Authors:Chen, Lei1 ; Mikiya, Araki2 ; Seiichi, Shiga2 ; Zeng, Wen1
Author affiliation:1 School of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China
2 Department of Mechanical Engineering, Gunma University, Gunma 376-8515, Japan
Corresponding author:Chen, L. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:30-34
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:Effect of CO2 dilution on combustion and emission characteristics of CH4, H2 and CO was analyzed in a spark-ignition engine. The results showed that dilution could reduce NOx emission. Suitable dilution ratio had little influence on brake mean effective pressure, cyclical fluctuation and brake thermal efficiency. However, excessive dilution ratio would induce to partial burn. Favorable operation range of biogas could be obtained with acceptable brake thermal efficiency and NOx emission by employing dilution combustion, which benefits for biogas application.
Number of references:10
Main heading:Dilution
Controlled terms:Biogas - Brakes - Carbon dioxide - Combustion
Uncontrolled terms:Brake mean effective pressures - Brake thermal efficiency - Dilution ratio - Effect of CO - Emission characteristics - Operation range - Partial burn - Spark-ignition engine
Classification code:521.1 Fuel Combustion - 522 Gas Fuels - 602 Mechanical Drives and Transmissions - 801 Chemistry - 804.2 Inorganic Compounds
DOI:10.6041/j.issn.1000-1298.2013.09.006
Database:Compendex
13. Accession number:20134116842779
Title:Improvement of cavitation characteristics of double suction centrifugal pump with compound impeller
Authors:Xiao, Ruofu1 ; Wang, Na1 ; Yang, Wei1 ; Yao, Zhifeng1 ; Wang, Fujun1
Author affiliation:1 College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Corresponding author:Xiao, R. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:35-39
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 the large flow conditions, the double suction centrifugal pump is susceptible to cavitation damage and has bad operation reliability. Aiming at the problem, a compound impeller with long and short blades was used to improve the cavitation characteristics. By using the shear stress transport (SST) k-ω turbulence model and Rayleigh-Plesset cavitation model, numerical simulation of the double suction centrifugal pump with a conventional impeller and a compound impeller were carried out respectively. The simulation results in the form of characteristic curves were compared with the experimental data, and the internal flow field was analyzed. The result showed that in the large flow conditions, critical net positive suction of the pump with a compound impeller was reduced. Also, the compound impeller can reduce the vapour distribution, change the pressure distribution and improve the dropping flow and backflow. Moreover, the better effect would be achieved under large flow condition.
Number of references:16
Main heading:Impellers
Controlled terms:Cavitation - Centrifugal pumps - Computational fluid dynamics - Computer simulation - Turbulence models
Uncontrolled terms:Cavitation characteristics - Cavitation damage - Characteristic curve - Compound impellers - Double-suction centrifugal pumps - Internal flow field - Operation reliability - Shear-stress transport
Classification code:601.2 Machine Components - 618.2 Pumps - 631.1 Fluid Flow, General - 631.1.1 Liquid Dynamics - 723.5 Computer Applications
DOI:10.6041/j.issn.1000-1298.2013.09.007
Database:Compendex
14. Accession number:20134116842783
Title:Periodic analysis of seasonal variation in soil heavy metals
Authors:Wang, Shengwei1, 2 ; Feng, Juan2, 3 ; Liu, Gang2 ; Zhang, Tianjiao2
Author affiliation:1 College of Computer Science and Engineering, Northwest Normal University, Lanzhou 730070, China
2 Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China
3 College of Information Science and Technology, Agricultural University of Hebei, Baoding 071001, China
Corresponding author:Liu, G. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:56-61
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 variation of heavy metal content in soils has important influence on cultivation security of crops. The concentrations of Pb, Hg, Cd, Cr, Cu and similar heavy metal As in arable soil were quarterly recorded in Binzhou of Shandong during the period from January 2010 to January 2013. The methods of periodic analysis and fast Fourier transform (FFT) spectral analysis were applied to calculate the principal component cycle of heavy metals, and to make further periodic test. The results showed that there was a different degree of accumulation trends in metals between the periods. The principal component cycle of Pb was two quarters in a year, Cd and As had four quarters as the main component cycle, and other heavy metals major cycle characteristics was not obvious.
Number of references:22
Main heading:Copper
Controlled terms:Fast Fourier transforms - Lead - Principal component analysis - Soils - Spectrum analysis
Uncontrolled terms:Cycle characteristic - Heavy metal contents - Period analysis - Periodic analysis - Power spectral analysis - Principal Components - Seasonal variation - Soil heavy metals
Classification code:483.1 Soils and Soil Mechanics - 544.1 Copper - 546.1 Lead and Alloys - 921.3 Mathematical Transformations - 922.2 Mathematical Statistics
DOI:10.6041/j.issn.1000-1298.2013.09.011
Database:Compendex
15. Accession number:20134116842788
Title:Effect of EN-1 on shear strength characteristics of Pisha sandstone solidified soil
Authors:Su, Tao1, 2 ; Zhang, Xingchang1, 3 ; Wang, Renjun2
Author affiliation:1 College of Natural Resources and Environment, Northwest A and F University, Yangling, Shaanxi 712100, China
2 College of Life Science, Qufu Normal University, Qufu 273165, China
3 Institute of Soil and Water Conservation, China Academy of Sciences, Yangling, Shaanxi 712100, China
Corresponding author:Zhang, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:86-90
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The cohesion and internal friction angle under the different EN-1 contents, curing ages, compaction degrees and water contents treated with EN-1 were determined by using direct shear test. The results showed that the shear strength of Pisha sandstone solidified soil had varying degrees of increase than plain soil with the increase of EN-1 contents and curing ages under the EN-1 contents, curing ages, compaction degrees and water contents in this experiment after EN-1 were added. The shear strength of Pisha sandstone solidified soil was the biggest when EN-1 content was 0.20% and curing age was 30 d. The shear strength of Pisha sandstone solidified soil increased with the increase of compaction degree and the decrease of water content after EN-1 was added. Consequently, in order to make the EN-1 solidified soil have favorable shear strength and satisfy engineering demand, it suggested that EN-1 content was 0.20%, curing age was 7-15 d, compaction degree was greater than 95%, and water content was slightly less than optimum moisture content when EN-1 was used practically to solid and protect slope in Pisha sandstone region.
Number of references:18
Main heading:Shear strength
Controlled terms:Compaction - Curing - Sandstone - Soils - Water content
Uncontrolled terms:Compaction degree - Curing age - Direct shear test - Internal friction angle - Optimum moisture content - Solidified agent - Solidified soils - Strength characteristics
Classification code:815.1 Polymeric Materials - 536.1 Powder Metallurgy Operations - 483.1 Soils and Soil Mechanics - 482.2 Minerals - 444 Water Resources - 422 Strength of Building Materials; Test Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties
DOI:10.6041/j.issn.1000-1298.2013.09.016
Database:Compendex
16. Accession number:20134116842813
Title:Classification methods of vocalization for laying hens in perch system
Authors:Yu, Ligen1 ; Teng, Guanghui1 ; Li, Baoming1 ; Lao, Fengdan1, 2 ; Cao, Yanfei1
Author affiliation:1 College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
2 Network Center, China Agricultural University, Beijing 100083, China
Corresponding author:Teng, G. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:236-242
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:Multi-taper spectral analysis was used to perform vocalization classification for laying hens in perch system. Sound Analysis Pro software was applied to compute spectral derivatives and acoustic features. Three methods including J48 decision tree algorithm, NaiveBayes theory and support vector machine were used to classify sounds of laying hens by using the open source data mining tool of Weka 3.6. Experimental results showed that vocalization of egg laying process and pleasure notes accounted for 42.2% and 21.6% between 7:00-8:00, while the natural behaviors and physiological activities were strongly performed with a comparison to traditional cage system. It was found that J48 decision tree algorithm had the highest classification rate (88.3%) for vocalization of laying hens, which could be used for different animal vocalization.
Number of references:29
Main heading:Data mining
Controlled terms:Classification (of information) - Decision trees - Spectrum analysis
Uncontrolled terms:Classification methods - Classification rates - J48 decision tree algorithms - Laying hens - Open source datum - Perch system - Physiological activity - Vocalization
Classification code:961 Systems Science - 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 - 922 Statistical Methods - 921 Mathematics - 723.3 Database Systems - 716.1 Information Theory and Signal Processing
DOI:10.6041/j.issn.1000-1298.2013.09.041
Database:Compendex
17. Accession number:20134116842787
Title:Effects of sediment load on hydrodynamic characteristics of overland flow
Authors:Zhao, Chunhong1 ; Gao, Jianen1, 2 ; Wang, Fei1 ; Zhang, Tong3 ; Zhang, Mengjie1
Author affiliation:1 College of Resources and Environment, Northwest A and F University, Yangling, Shaanxi 712100, China
2 Institute of Soil and Water Conservation, China Academy of Sciences, Yangling, Shaanxi 712100, China
3 College of Water Resources and Architectural Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
Corresponding author:Gao, J. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:79-85
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 potential effects of sediment load (S) on hydrodynamic parameters of overland flow were investigated in a smooth plexi-glass flume under a wider range of sediment load and slope gradient of 9°. The results showed that Reynolds number (Re) decreased as sediment load increased, implying a decrease in flow turbulence. Froude number, mean flow velocity and correction factor to flow velocity (α) first all decreased with sediment load increasing and then the values all suddenly increased and gradually become stable as sediment load further increased when S>300 kg/m3. The mean α was 0.554. For the difference between standard of energy dissipation in sediment-laden and clear-water overland flow, the conclusions were also different. When S<300 kg/m3, the friction coefficient of sediment-laden flow was larger than that of clear water flow either with the same Reynolds number or unit flow rate as standard. While, when S>300 kg/m3, the friction coefficient of sediment-laden flow was smaller than that of clear water flow with the same Reynolds number and larger with the same unit flow rate.
Number of references:18
Main heading:Sediments
Controlled terms:Energy dissipation - Flow of water - Flow rate - Flow velocity - Friction - Hydraulics - Hydrodynamics - Reynolds number
Uncontrolled terms:Friction coefficients - Hydrodynamic characteristics - Hydrodynamic parameters - Mean flow velocities - Overland flow - Sediment laden flows - Sediment loads - Soil erosion
Classification code:483 Soil Mechanics and Foundations - 525.4 Energy Losses (industrial and residential) - 631 Fluid Flow - 632.1 Hydraulics - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids
DOI:10.6041/j.issn.1000-1298.2013.09.015
Database:Compendex
18. Accession number:20134116842800
Title:Kinetics of enzymatic hydrolysis of proteins in peanut emulsion
Authors:Zhang, Shaobing1 ; Liu, Xiangjun1 ; Lu, Qiyu1
Author affiliation:1 College of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, China
Corresponding author:Lu, Q. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:157-161
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:The kinetics of protein hydrolysis catalyzed by alkaline protease Alcalase 2.4 L was investigated in the peanut emulsion medium. The results showed that degree of protein hydrolysis was enhanced with the increase of initial enzyme concentration, but it was decreased with the increase of initial substrate concentration at fixed enzyme concentration. There was a good positive relationship between degree of protein hydrolysis and demulsification of emulsion (r=0.983). The apparent Michaelis constant Km was 0.069 8 mol/L and the maximum velocity Vmax was 3.71×10-4 mol/(min·L) in the peanut emulsion. The kinetic equation of peanut protein hydrolyzed by Alcalase 2.4 L at initial stage was obtained based on the experimental data. The critical substrate concentration was 8.73 g/L (initial enzyme concentration was 0.05%) for hydrolysis of protein and demulsification.
Number of references:17
Main heading:Proteins
Controlled terms:Demulsification - Emulsification - Enzymatic hydrolysis - Enzyme kinetics - Integral equations - Kinetics - Oilseeds
Uncontrolled terms:Alkaline protease - Apparent michaelis constants - Enzyme concentrations - Kinetic equations - Kinetics of enzymatic hydrolysis - Maximum velocity - Protein hydrolysis - Substrate concentrations
Classification code:802.2 Chemical Reactions - 802.3 Chemical Operations - 804.1 Organic Compounds - 821.4 Agricultural Products - 921.2 Calculus - 931 Classical Physics; Quantum Theory; Relativity
DOI:10.6041/j.issn.1000-1298.2013.09.028
Database:Compendex
19. Accession number:20134116842818
Title:Calculation method of magnification ratio for lever-type flexure hinge mechanism driven by piezoactuator
Authors:Shen, Jianying1 ; Zhang, Haijun1 ; Zhao, Yun1
Author affiliation:1 College of Mechanical and Electrical Engineering, Jiaxing University, Jiaxing 314001, China
Corresponding author:Shen, J. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:267-271
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:Lever-type flexure hinge mechanism was usually used to amplify the tiny displacement produced by piezoactuator in the field of precision micro-displacement. The calculation formula of the magnification ratio for lever-type flexure hinge mechanism was deduced by considering the deviation of the rotation center of flexure hinge and it was verified by using the finite element analysis and experiment. The magnification ratios, which were obtained from the formula calculation, the FEM simulation analysis and experimental test, were 8.31, 8.38 and 8.20, respectively. The error between the FEM simulation value and the calculation value was 1% and the error between the FEM simulation value and the calculation value was 1.3%. Therefore, the correctness of the calculation formula was proved.
Number of references:12
Main heading:Hinges
Controlled terms:Finite element method
Uncontrolled terms:Calculation formula - Experimental test - FEM simulations - Flexure hinge - Magnification ratio - Microdisplacement - Piezo actuator - Rotation centers
Classification code:605 Small Tools and Hardware - 921.6 Numerical Methods
DOI:10.6041/j.issn.1000-1298.2013.09.046
Database:Compendex
20. Accession number:20134116842776
Title:Digital image processing method of gasoline direct injection spray based on matlab/GUI
Authors:Wang, Zhaowen1 ; Li, Hao1 ; Huang, Du1 ; Huang, Ronghua1 ; Ding, Hongyuan1
Author affiliation:1 School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Corresponding author:Wang, Z. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:19-23
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 image processing program with good instantaneity for gasoline direct injection spray based on Matlab/GUI was designed and the program realized visual operation interface. As gasoline is fuel with great volatile, the spray boundary of GDI image is relative obscure and SNR of the spray image is not satisfied compared with that in diesel injection. To get the accurate spray penetration, cone angle, perimeter, area and other needed parameters, the spray boundary was precisely extracted in the image processing. Noise filtering, boundary detection, morphological analysis and other related methods have been used. After the spray boundary was obtained, program to calculate spray penetration, cone angle, injection velocity and other parameters was developed to realize real-time measurement of spray parameters.
Number of references:12
Main heading:Gasoline
Controlled terms:Direct injection - Image processing
Uncontrolled terms:Boundary detection - Gasoline direct injection - Injection velocity - Matlab/gui - Morphological analysis - Operation interface - Real time measurements - Spray parameters
Classification code:521 Fuel Combustion and Flame Research - 523 Liquid Fuels - 741 Light, Optics and Optical Devices
DOI:10.6041/j.issn.1000-1298.2013.09.004
Database:Compendex
21. Accession number:20134116842795
Title:Parameters optimization of electronic nose in detection of beef freshness
Authors:Hong, Xuezhen1 ; Wang, Jun1
Author affiliation:1 School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
Corresponding author:Wang, J. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:125-131 137
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:The effects of beaker volume, sample weight and headspace-generation time on the response of a PEN2 electronic nose (e-nose) were studied. Both the peak and final stable responding points of sensors were extracted. Principle component analysis (PCA), linear discriminant analysis (LDA) and analysis of variance (ANOVA) were employed to analyze the responding of each sensor as well as the whole sensor array, and the optimum parameters (500 mL beaker volume, 25 g sample mass, 5 min headspace-generation time) were acquired for later beef storage time detection. The difference in volatile profiles of beef samples of seven different storage times (0, 3, 5, 7, 10, 12 and 14 d) was confirmed. The stepwise linear discriminant analysis (Step-LDA) results showed that the correct rate was 98.57%.
Number of references:19
Main heading:Principal component analysis
Controlled terms:Analysis of variance (ANOVA) - Beef - Discriminant analysis - Meats - Optimization - Sensors
Uncontrolled terms:Electronic NOSE - Electronic nose (e-nose) - Linear discriminant analysis - Optimum parameters - Parameters optimization - Principle component analysis - Stepwise discriminant analysis - Stepwise linear discriminant analysis
Classification code:801 Chemistry - 822.3 Food Products - 921.5 Optimization Techniques - 922 Statistical Methods - 922.2 Mathematical Statistics
DOI:10.6041/j.issn.1000-1298.2013.09.023
Database:Compendex
22. Accession number:20134116842799
Title:Analysis of moisture transport characteristics during potato drying process based on fractal theory
Authors:Zhang, Sai1 ; Chen, Junruo1 ; Liu, Xianxi1
Author affiliation:1 Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China
Corresponding author:Chen, J. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:152-156
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:For the heterogeneity and random distribution in potato internal structure, the water transport process during drying was simulated by using fractal characteristics. The result showed that the model combined with shrinkage and fractal was more close to the experimental data than no shrinkage and continuum model, and the internal pressure distribution did not fall step by step in proportion as continuous model. The fractal model including shrinkage increased with pore connectivity, porosity, area fractal dimension and the ratio of the minimum and maximum pore diameters, whereas it decreased with tortuosity fractal dimension and pore tortuosity.
Number of references:17
Main heading:Drying
Controlled terms:Continuum mechanics - Fractal dimension - Moisture - Shrinkage
Uncontrolled terms:Area fractal dimensions - Continuous modeling - Fractal characteristics - Fractal theory - Moisture transport - Potato - Random distribution - Tortuosity fractal dimensions
Classification code:642.1 Process Heating - 801.4 Physical Chemistry - 921 Mathematics - 931.1 Mechanics - 951 Materials Science
DOI:10.6041/j.issn.1000-1298.2013.09.027
Database:Compendex
23. Accession number:20134116842802
Title:Research development of spectral imaging technology in early detection of botanical diseases
Authors:Feng, Lei1 ; Gao, Jixing1 ; He, Yong1 ; Liu, Fei1
Author affiliation:1 College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
Corresponding author:He, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:169-176
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 research achievements of spectral imaging technology in early detection of botanical diseases were briefly summarized. The plant disease is an important factor that restricts the steady development of agriculture. It is fundamental to botanical production and management to utilize real-time, sensitive, stable detection and prevention methods. Combined multi-spectral images, hyperspectral images, infrared thermal images with plant pathology as well as chemometrics, infected plants can be detected in early stage by spectral imaging technology. It is very meaningful to build a quantitative model that can reflect botanical diseases and its extent precisely.
Number of references:74
Main heading:Spectroscopy
Controlled terms:Imaging techniques
Uncontrolled terms:Hyper-spectral images - Infrared thermal image - Multispectral images - Prevention methods - Quantitative modeling - Research achievements - Research development - Spectral imaging technology
Classification code:741 Light, Optics and Optical Devices - 746 Imaging Techniques - 801 Chemistry
DOI:10.6041/j.issn.1000-1298.2013.09.030
Database:Compendex
24. Accession number:20134116842821
Title:Orthogonal optimization design and experiment of oval composite tube in valveless piezoelectric pump
Authors:Deng, Zhidan1 ; He, Xiuhua2 ; Yang, Song2 ; Li, Fu2
Author affiliation:1 Faculty of Science, Jiangsu University, Zhenjiang 212013, China
2 School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Deng, Z. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:284-288 278
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 characteristics of flow resistance in the valveless piezoelectric pump, a micro-flow tube called oval composite was presented. It's a kind of three-way tube, of which branch tube was composed of oval nozzle/diffuser elements and converging tube was composed of traditional nozzle/diffuser elements. In the numerical simulation, the orthogonal optimization was applied to obtain parameters of the proposed tube. The minimum width of converging tube d was 150 μm and the depth of the tube H was 150 μm. The optimization results showed that when the pressure difference between the inlet and outlet was fixed at 50 kPa, the highest coefficient of positive and negative flow resistance λ was achieved with optimization parameters of r=75 μm, L=3 000 μm, θ = 7°, γ = 80°, a=1 000 μm, b=450 μm. Then, the optimized composite tubes were produced though MEMS processing technology and the experiments were carried out and compared with the numerical simulations. The results showed that the experimental value was less than simulated value with pressure difference of 10-100 kPa. The positive largest mass flow difference between the experiment and simulation was 12.6%, and the negative was 5.3%. When the pressure difference was 50 kPa, λ was 1.83 (positive) and 1.97(negative) with difference of 7.65%.
Number of references:14
Main heading:Tubes (components)
Controlled terms:Computer simulation - Experiments - Inlet flow - Numerical models - Optimization - Piezoelectric devices
Uncontrolled terms:Composite tube - Optimization parameter - Optimized composites - Orthogonal optimizations - Orthogonal test - Piezoelectric pump - Pressure differences - Processing technologies
Classification code:921 Mathematics - 901.3 Engineering Research - 723.5 Computer Applications - 921.5 Optimization Techniques - 714 Electronic Components and Tubes - 631.1 Fluid Flow, General - 616.1 Heat Exchange Equipment and Components - 704 Electric Components and Equipment
DOI:10.6041/j.issn.1000-1298.2013.09.049
Database:Compendex
25. Accession number:20134116842820
Title:Improving design of 1-D photonic crystal filter in micro-thermophotovoltaic system
Authors:Tang, Aikun1 ; Pan, Jianfeng1 ; Shao, Xia1 ; Liu, Yangxian1 ; Hu, Song1
Author affiliation:1 School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Pan, J. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:279-283
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:To further increase energy conversion efficiency of micro-thermophotovoltaic system, a 1-D Si/SiO2 photonic crystal filter was set in the system to ensure recycle of long wavelength radiation energy. The basic structure design and corresponding optical characteristics were obtained through optical thin film theory and transmission matrix method, and an improved design [1.10(L/2HL/2)](L/2HL/2)3[1.10(L/2HL/2)] [0.95(L/2HL/2)](L/2HL/2)3[0.95(L/2HL/2)] was developed according to the narrower first reflection band of basic structure by method of multilayered film superposition, which could extend the first reflection band to 2-4 μm and also had a transmission of 0.95 in the pass band. By perfecting the energy transition computational model, calculation results showed that the using of filter could effectively lower the burden of cell cooling, while at the same time boosted the temperature of radiation wall so as to raise system output performance. System output power density and total efficiency reached to 5.46 W and 2.6% when using the improved structure filter at mixture flux of 1 500 mL/min, which was 5.7% higher than the result of using basic structure filter.
Number of references:13
Main heading:Design
Controlled terms:Energy conversion - Photonic crystals - Wavemeters
Uncontrolled terms:1-D photonic crystal - Improved designs - Improved structures - Micro thermophotovoltaic system - Micro-thermophotovoltaic - Optical characteristics - Performance analysis - Transmission matrix method
Classification code:408 Structural Design - 525.5 Energy Conversion Issues - 933.1 Crystalline Solids - 942.1 Electric and Electronic Instruments
DOI:10.6041/j.issn.1000-1298.2013.09.048
Database:Compendex
26. Accession number:20134116842815
Title:Power flow model of high-speed motorized spindles and its thermal characteristics
Authors:Chen, Xiaoan1 ; Zhang, Peng1 ; He, Ye1 ; Liu, Junfeng1
Author affiliation:1 State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
Corresponding author:Chen, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:250-254
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 law of energy conservation, a power flow model of high-speed motorized spindles was presented. Quantitative power loss models of the built-in motor, bearings and air were developed. An experiment on the 2ZDG60 motorized spindle was carried out under several operating conditions. The good agreement between the theoretical results and the experimental data indicated that the power flow model was capable of accurately predicting the power loss of high-speed motorized spindles. And on all these points, the thermal simulation data of 2ZDG60 motorized spindle showed that the temperature rose on the areas of bearings and motor was higher. The little error of testing data and simulation data of temperature rise proved the correctness of the power flow model.
Number of references:14
Main heading:Computer simulation
Controlled terms:Speed regulators
Uncontrolled terms:High-speed motorized spindles - Law of energy conservation - Motorized spindle - Operating condition - Power flows - Power loss models - Thermal characteristics - Thermal simulations
Classification code:723.5 Computer Applications - 732.1 Control Equipment
DOI:10.6041/j.issn.1000-1298.2013.09.043
Database:Compendex
27. Accession number:20134116842814
Title:Effect of Locust's phototactic response to regulatory illuminance of LED light source
Authors:Liu, Qihang1 ; Zhou, Qiang2
Author affiliation:1 Henan Mechanical and Electronical Engineering College, Xinxiang 453003, China
2 College of Engineering, China Agricultural University, Beijing 100083, China
Corresponding author:Zhou, Q. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:243-249
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:According to the phototactic choice, sensitive recognition and phototactic gain stimulated by flashing and alternating light of locust, the regulatory illumination of array stripe light source was used to conduct regulatory illuminance experiment. The different spectral illumination combinations were compared. The mechanism of locust's phototactic effect was discussed. The results suggested that combined mode of spectral illumination of array stripe and regulatory illumination could enhance locust's phototactic visual gain, regulate locust's phototactic optokinetic effect, stimulate locust's phototactic aggregation effect, and increase locust's phototactic activity. Locust's phototactic effect was decided by spectral illumination energy and regulatory illuminance mode of array stripe. The optimum stimulation mode was consisted of 30 ms luminous interval of frequency violet light array and 640 ms luminous cycle of alternating green-violet-blue vertical stripe light array. The results of locusts stimulated by regulatory illumination of light source in the breeding shed showed that locusts' phototactic effect was better at 20:00-23:00. When it continue to 24:00, the total response and aggregation rate were 80%±5% and 50%±5%, respectively. The locust's biological habits and alertness, locust's phototactic inertia, environmental factors and LED restriction restricted locust's phototactic effect.
Number of references:15
Main heading:Light emitting diodes
Controlled terms:Light sources
Uncontrolled terms:Aggregation rate - Environmental factors - Illumination energy - LED light source - Locusts - Phototactic effect - Phototactic response - Regulatory illuminance
Classification code:741.1 Light/Optics - 744 Lasers
DOI:10.6041/j.issn.1000-1298.2013.09.042
Database:Compendex
28. Accession number:20134116842816
Title:Modeling and simulation of multi-layered lamina emergent mechanisms based on pseudo-rigid-body
Authors:Qiu, Lifang1 ; Chu, Hongyan1 ; Yang, Debin1 ; Wang, Tao1
Author affiliation:1 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Corresponding author:Yang, D. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:255-260
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 multi-layered lamina emergent mechanism configuration was designed, combined with classification scheme and rigid-body replacement synthesis design approach. Based on pseudo-rigid-body model and analogous linear coil spring model of lamina emergent torsional (LET) joint, the force-deflection relationship was derived. With the aid of finite element analysis, the results of the two methods were compared and the causes of error were analyzed. The results obtained by the two methods were approximated. This indicated that the analysis and design methods were correct and feasible.
Number of references:10
Main heading:Compliant mechanisms
Controlled terms:Computer simulation - Finite element method
Uncontrolled terms:Classification scheme - Design method - Force deflection - Lamina emergent mechanisms - Model and simulation - Pseudo-rigid body models - Pseudo-rigid-body - Synthesis design
Classification code:723.5 Computer Applications - 921.6 Numerical Methods - 931.1 Mechanics
DOI:10.6041/j.issn.1000-1298.2013.09.044
Database:Compendex
29. Accession number:20134116842798
Title:Modeling simulation of combined convective and infrared radiation in rice drying process
Authors:Wang, Xibo1 ; Hu, Qiong2 ; Xiao, Bo2 ; Yang, Deyong2 ; Liu, Xiangdong2
Author affiliation:1 China Grain Reserves Corporation, Beijing 100044, China
2 College of Engineering, China Agricultural University, Beijing 100083, China
Corresponding author:Liu, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:145-151
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:In order to reveal the mechanism of combined convective and infrared radiation in rice drying process and analyze heat and mass transfer characteristics, a mathematical model of combined convective and infrared radiation was established. The heat and mass transfer process in rice drying was simulated. According to the drying conditions in numerical simulation, the test rig of combined convective and infrared radiation was built up to analyze the influence of the drying process under the different operating conditions. The results showed that there was high relativity between the numerical model curves and the experimental curves.
Number of references:11
Main heading:Drying
Controlled terms:Heat convection - Heat transfer - Infrared radiation - Mass transfer - Numerical models
Uncontrolled terms:Different operating conditions - Drying condition - Drying process - Experimental curves - Heat and mass transfer - Heat and mass transfer process - Model simulation - Test rigs
Classification code:641.2 Heat Transfer - 641.3 Mass Transfer - 642.1 Process Heating - 741.1 Light/Optics - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2013.09.026
Database:Compendex
30. Accession number:20134116842807
Title:Image recognition algorithm of Hlyphantria cunea larva net
Authors:Zhao, Ying1 ; Sun, Qun1 ; Ge, Guangying2
Author affiliation:1 School of Automobile and Transportation Engineering, Liaocheng University, Liaocheng 252000, China
2 School of Physics and Information Engineering, Liaocheng University, Liaocheng 252000, China
Corresponding author:Zhao, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:198-202 208
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:According to color distribution characteristics of Hlyphantria cunea larva nets, RGB color space was selected and the data differences of each channel were analyzed for net curtains, leaves and branches. Furthermore, R-B color model with the Otsu method and threshold algorithm were used to segment images. The region labeling and Freeman coding methods were adopted to calculate the area of each region. The double threshold value was determined and residual noise was removed by using the mean and standard deviation of a plurality area. According to the differences between area sizes, fine white and white regions were compensated by using improved expansion corrosion method. Experimental results showed that the accuracy of net curtain image recognition was above 85% and single image processing time was less than 40 ms.
Number of references:13
Main heading:Image recognition
Controlled terms:Image segmentation
Uncontrolled terms:Color distribution - Double threshold values - Hlyphantria cunea - Larva net - Mean and standard deviations - Recognition algorithm - RGB color space - Threshold algorithms
Classification code:716 Telecommunication; Radar, Radio and Television - 741.1 Light/Optics
DOI:10.6041/j.issn.1000-1298.2013.09.035
Database:Compendex
31. Accession number:20134116842805
Title:Online segmentation of clustering diced-potatoes using watershed and improved MRF algorithm
Authors:Wang, Kaiyi1, 2 ; Zhang, Shuifa1, 2 ; Yang, Feng1, 2 ; Liu, Zhongqiang1, 2 ; Wang, Xiaofeng1, 2
Author affiliation:1 Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China
2 National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China
Corresponding author:Wang, K. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:187-192
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:To solve the unsupervised segmentation problem of clustering diced-potatoes, a watershed and improved Markov random field (MRF) algorithm was proposed. The original image was easily transformed from pixel-based to region-based by watershed algorithm, which was good for labeling by MRF. At the same time, the ISING model was improved to make the consistent of probability of MRF. Firstly the original image was transformed from pixel-based to region-based by watershed algorithm. Secondly the improved MRF was applied to distinguish over-segmentation regions from right segmentation regions by fusing the relative height and area of the original segmentation regions. Finally the most compactness adjoining over-segmentation regions were connected into bigger ones. Using this algorithm, 95% of the test clusters were correctly segmented in potatoes preparations.
Number of references:19
Main heading:Clustering algorithms
Controlled terms:Image segmentation - Ising model - Markov processes - Pixels - Watersheds
Uncontrolled terms:Clustering - Diced-potato - Markov Random Fields - Original images - Over segmentation - Relative heights - Unsupervised segmentation - Water-shed algorithm
Classification code:444.1 Surface Water - 721 Computer Circuits and Logic Elements - 723.5 Computer Applications - 741.1 Light/Optics - 922 Statistical Methods - 922.1 Probability Theory
DOI:10.6041/j.issn.1000-1298.2013.09.033
Database:Compendex
32. Accession number:20134116842801
Title:Effect of W/O and W/O/W controlled-release emulsion coagulants on characteristic of bittern-solidified tofu
Authors:Li, Jinlong1 ; Cheng, Yongqiang1 ; Jiao, Xiang2 ; Zhu, Qiaomei1 ; Yin, Lijun1
Author affiliation:1 College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
2 China Organic Food Certification Center, Beijing 100081, China
Corresponding author:Yin, L. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:162-168
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:Water-in-oil (W/O) and water-in-oil-in-water (W/O/W) emulsions with bittern solution as internal aqueous phase were prepared. These emulsion coagulants showed good controlled-release property when used in traditional firm tofu preparation. Compared with the traditional bittern coagulant, emulsion coagulants significantly improved the water content from 70% to the maximum 84% or 79%, as well as increased the yield of tofu gel. In addition, the use of emulsion coagulants modified the tofu gel to be more smooth and homogenous, as well as significantly reduced the hardness of tofu gel while remained the spring and improved the bright. Results also indicated that the loss of protein and soy isoflavones during tofu preparation was decreased, along with a higher yield of soy isoflavones.
Number of references:27
Main heading:Coagulation
Controlled terms:Emulsification - Emulsions - Flavonoids - Textures
Uncontrolled terms:Aqueous phase - Bittern-solidified tofu - Coagulant - Controlled release - Higher yield - Soy isoflavones - Water-in-oil - Water-in-oil-in-water
Classification code:802.3 Chemical Operations - 804 Chemical Products Generally - 804.1 Organic Compounds - 933 Solid State Physics
DOI:10.6041/j.issn.1000-1298.2013.09.029
Database:Compendex
33. Accession number:20134116842797
Title:On-line NIR detection model optimization of soluble solids content in navel orange based on CARS
Authors:Liu, Yande1 ; Shi, Yu1 ; Cai, Lijun1 ; Zhou, Yanrui1
Author affiliation:1 School of Mechatronical and Electronical Engineering, East China Jiaotong University, Nanchang 330013, China
Corresponding author:Liu, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:138-144
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 predictive precision for on-line determination of soluble solids content (SSC) of Gannan navel orange, the dynamic detecting system was applied to optimize online detection model by visible and near-infrared reflectance spectroscopy. The spectra were obtained at the constant velocity of 5 navel oranges per second. After employing various preprocessing methods, the sensitive spectral regions were analyzed by different variable selection methods, including backward interval partial least-squares (BiPLS), genetic algorithm (GA), and competitive adaptive reweighted sampling (CARS). The predictive abilities of the models were evaluated by prediction set. The results indicated that the best model was obtained by CARS with the first derivative. The correlation coefficient (Rp) and root mean square error of prediction (RMSEP) was 0.94 and 0.42% for SSC respectively. The results showed that the proposed method of CARS could effectively simplify the online detection model of SSC of Gannan navel orange based on visible/near-infrared (Vis/NIR) diffuse transmittance spectroscopy, and enhance the predictive precision. The study can provide a reference for optimizing online detecting system of Gannan navel orange.
Number of references:27
Main heading:Citrus fruits
Controlled terms:Coherent scattering - Infrared devices - Least squares approximations - Mean square error - Optimization
Uncontrolled terms:Correlation coefficient - Navel orange - On-line determination - Online detecting system - Root-mean-square error of predictions - Transmittance spectroscopies - Variable selection methods - Visible and near infrared reflectance spectroscopy
Classification code:711 Electromagnetic Waves - 731.1 Control Systems - 741.3 Optical Devices and Systems - 821.4 Agricultural Products - 921.5 Optimization Techniques - 921.6 Numerical Methods
DOI:10.6041/j.issn.1000-1298.2013.09.025
Database:Compendex
34. Accession number:20134116842785
Title:Optimization of solute transport parameters in unsaturated soil based on genetic algorithm
Authors:Ren, Changjiang1 ; Bai, Dan1 ; Zhou, Beibei1 ; Liang, Wei2 ; Zhou, Wen1, 3 ; Cheng, Peng1, 3
Author affiliation:1 Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048, China
2 College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China
3 College of Mathematics and Information Science, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
Corresponding author:Bai, D. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:68-72
Language:Chinese
ISSN:10001298
CODEN:NUYCA3
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Machinery, No. 1 Beishatan Deshengmen Wai, Beijing, 100083, China
Abstract:According to the experiment and numerical simulation, a multi-objective optimization model for identification of solute and water transport parameters was built up, which use soil water content and the minimum standard deviation of measured and observed water content and solute as optimized objective. A combination of genetic algorithm, finite difference and linear weighted method was applied for calculation. Taking one, two and three groups experimental data as initial data, solute transport parameters in unsaturated soil were obtained and verified by using the experimental data at 1 345 min. The maximum and minimum correlation coefficient between calculated and measured value of water content were 0.975 3 and 0.945 0. The maximum and minimum correlation coefficient between calculated and measured value of bromonium ion concentration was 0.964 6 and 0.935 2. The measured results were well coincided with the calculated results and showed the feasibility of the proposed method.
Number of references:22
Main heading:Genetic algorithms
Controlled terms:Identification (control systems) - Multiobjective optimization - Parameter estimation - Soil moisture - Solute transport
Uncontrolled terms:Correlation coefficient - Ion concentrations - Measured results - Multi-objective optimization models - Parameters identification - Soil water content - Solute transport parameters - Standard deviation
Classification code:483.1 Soils and Soil Mechanics - 723 Computer Software, Data Handling and Applications - 731.1 Control Systems - 921 Mathematics - 921.5 Optimization Techniques
DOI:10.6041/j.issn.1000-1298.2013.09.013
Database:Compendex
35. Accession number:20134116842804
Title:Discrimination of strawberries varieties based on characteristic spectrum
Authors:Yan, Run1, 2 ; Wang, Xinzhong1 ; Qiu, Baijing1 ; Shi, Delin2 ; Kong, Pengfei1
Author affiliation:1 Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China
2 Jiangsu Polytechnic College of Agriculture and Forestry, Jurong 212400, China
Corresponding author:Wang, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
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:Near infrared spectroscopy (NIRS) technology was applied to discriminate the variety of strawberries rapidly. Compared with seven kinds of preprocessing methods, "SNV MAF 2D" was ascertained as the optimal scheme. Totally 14 characteristic spectrums related to strawberries information were extracted by the correlation coefficient and threshold value method. Three kinds of correction models of PLS-ANN, PLSR and PCR based on wavelength ranging from 548 nm to 562 nm were established. Verified by the prediction set samples, the optimal correction model was PLS-ANN with nine principal components. Prediction correlation coefficientand root mean square error of prediction(RMSEP) of the PLS-ANN correction model was 0.967 7 and 0.461. The results showed that a few characteristic spectrum extracted to establish PLS-ANN correction model would achieve rapid discrimination of strawberries.
Number of references:18
Main heading:Fruits
Controlled terms:Forecasting - Mean square error - Near infrared spectroscopy
Uncontrolled terms:Characteristic spectrum - Correlation coefficient - PLS-ANN - Pre-processing method - Root-mean-square error of predictions - Strawberries - Threshold value methods - Varieties discrimination
Classification code:731.1 Control Systems - 801 Chemistry - 821.4 Agricultural Products - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2013.09.032
Database:Compendex
36. Accession number:20134116842817
Title:Multi-objective optimization of 3-UPS-S parallel mechanism based on isight
Authors:Cui, Guohua1 ; Zhou, Haidong1 ; Wang, Nan2 ; Zhang, Haiqiang1
Author affiliation:1 College of Equipment Manufacture, Hebei University of Engineering, Handan 056038, China
2 Graduate Faculty, Hebei University of Engineering, Handan 056038, China
Corresponding author:Wang, N. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:261-266
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 overall consideration of the various performance of the parallel robot (e.g. workspace, dexterity, bearing capacity, stiffness, etc.), a basic procedure was carried out for the multi-objective optimization with the example of 3-UPS-S based on the integration of Matlab, Pro/E, ANSYS by Isight, and a multi-objective dimensional synthesis was carried out for the parallel mechanism. Thus, a method was proposed for the multi-objective optimization of parallel mechanism based on Isight. The result of the analysis indicated that the proposed method could automatically solve the kinematic and dynamic performance, achieve modeling and finish the finite element analysis for the design of experiments and multi-objective optimization with the integration of the engineering software. Through the Pareto graph and the Pareto front obtained, the designer could select the appropriate optimal solution for the parallel mechanism with more information.
Number of references:15
Main heading:Multiobjective optimization
Controlled terms:Design of experiments - Integration - MATLAB - Mechanisms - Robots
Uncontrolled terms:Basic procedure - Dimensional synthesis - Dynamic performance - Engineering software - Multi objective - Optimal solutions - Parallel mechanisms - Parallel robots
Classification code:601.3 Mechanisms - 731.5 Robotics - 901.3 Engineering Research - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2013.09.045
Database:Compendex
37. Accession number:20134116842781
Title:Theoretical relations between relative characteristics of impeller pumps and specific speed
Authors:Li, Mingsi1 ; Lan, Mingju1 ; Lü, Tingbo1
Author affiliation:1 College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi 832003, China
Corresponding author:Li, M. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:46-50
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 analyze the effects of specific speed ns of impeller pumps on hydraulic performance theoretically, relative head-flow equation and shaft power-flow equation were deduced under the ideal fluid condition based on the basic equation of impeller pumps. The relations between the equations and ns were analyzed as well as the equations application. The results showed that the equations of relative characteristic curves of impeller pumps were functional set of high efficient operation relevant to ns and the slope of iso-efficiency curve (IeC) passing the nominal operation point (NOP). The characteristic curve describing the relation of relative head to relative capacity (RC) was the quadratic parabola of ns and the curve describing the relation of relative shaft power to RC is the cubic parabola of ns; for the RC unequal 1, pump efficiency is decreasing with increased ns. A high ns causes gentle slope of IeC passing NOP, consequent on the high efficient operation range of impeller pump approaching the capacity axis in the comprehensive characteristic curves charts; conversely, the high efficient operation range approaching the head axis for a low ns.
Number of references:12
Main heading:Pumps
Controlled terms:Impellers
Uncontrolled terms:Basic equations - Characteristic curve - Hydraulic performance - Impeller pumps - Nominal operations - Operation range - Pump efficiency - Specific speed
Classification code:601.2 Machine Components - 618.2 Pumps
DOI:10.6041/j.issn.1000-1298.2013.09.009
Database:Compendex
38. Accession number:20134116842775
Title:Experiment and simulation on response performance of electro-hydraulic VVT system for gasoline engine
Authors:Ban, Zhibo1 ; Xie, Hui1 ; He, Yu1
Author affiliation:1 State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Corresponding author:Ban, Z. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:12-18 29
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 response performance of electro-hydraulic VVT technology has significant influence on combustion and emission of gasoline engine. Actual valve timing value should be quickly adjusted to target value on transient operation conditions for gasoline engine. Response speed of electro-hydraulic VVT can be further improved since it has constraints for breakthrough. Factors which have influence on the response speed of electro-hydraulic VVT were studied by both experiment and simulation. Step response process was divided into several sub-process and analyzed. Feed forward control algorithm was designed and applied in VVT control. Experiment results showed that the proposed method could achieve rapid response of VVT and assure the stability at the same time.
Number of references:13
Main heading:Gasoline
Controlled terms:Algorithms - Engines - Experiments
Uncontrolled terms:Electro-hydraulics - Gasoline engines - Phaser - Rapid response - Response performance - Response process - Transient operation - Variable valve timing
Classification code:523 Liquid Fuels - 612 Engines - 723 Computer Software, Data Handling and Applications - 901.3 Engineering Research - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2013.09.003
Database:Compendex
39. Accession number:20134116842810
Title:Detection system for wheat biomass based on LabVIEW
Authors:Zheng, Ling1 ; Zhu, Dazhou2 ; Wang, Cheng2 ; Pan, Dayu2 ; Luo, Bin2 ; Zhao, Chunjiang2
Author affiliation:1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling, Shaanxi 712100, China
2 Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China
Corresponding author:Zhao, C. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:214-218
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 detect the wheat biomass non-destructively and fast, a system based on LabVIEW was developed according to the mechanical property of wheat stalk. Real-time acquisition, display and storage of the data was finished by detection system based on LabVIEW, with mechanical sensor as measuring element and collecting resilience signal produced when the stalk was pushed by the rod with high-speed acquisition module DAM-3056AH of ART-TECH. The detection system was tested in the wheat field to examine its property. The results showed that the resilience of the wheat stalks between different varieties were clearly different. The resilience of the wheat stalk had close relationship with biomass (fresh weight), of which the R2 was achieved 0.712 7. It was indicated that the detection of wheat biomass based on mechanics was feasible.
Number of references:15
Main heading:Biomass
Controlled terms:Digital storage - Mechanical properties - Pressure sensors
Uncontrolled terms:Detection system - Fresh weight - High-speed acquisitions - LabViEW - Mechanical sensors - Real time acquisition - Wheat - Wheat biomass
Classification code:525.1 Energy Resources and Renewable Energy Issues - 722.1 Data Storage, Equipment and Techniques - 944.3 Pressure Measuring Instruments - 951 Materials Science
DOI:10.6041/j.issn.1000-1298.2013.09.038
Database:Compendex
40. Accession number:20134116842786
Title:DNDC model analysis of N2O fluxes in winter wheat/summer maize system with reclaimed water irrigation
Authors:Xue, Yandong1 ; Ren, Shumei1 ; Yang, Peiling1 ; Niu, Yongtao1 ; Zou, Qihui1
Author affiliation:1 College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
Corresponding author:Ren, S. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:73-78 85
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 validities of Denitrification-Decomposition (DNDC) model and the simulation parameters were examined by using field experiment data obtained from a wheat/maize rotation system. Based on the differences between N availabilities in reclaimed water and inorganic N fertilizer, three scenarios (1:1, 1.7:1, 2:1) were hypothesized to evaluate the feasibility about simulating nitrous oxide (N2O) emission in soil irrigated with reclaimed water by DNDC model. The results showed that DNDC model performed well in verifying the temporal variations of soil moisture under reclaimed water (r=0.716, n=29, P<0.01) and ground water irrigation (r=0.703, n=29, P<0.01), and mean daily temperature (r=0.89, n=35, P<0.01) at soil surface under ground water irrigation. The peaks of N2O induced by irrigation, rainfall and fertilization events were detected by DNDC model. However, the measured N2O fluxes generally lagged behind the simulated fluxes, so the performance of DNDC model were not satisfied in simulating N2O fluxes. The measured and estimated N2O production was 1.84 kg/hm2 and 1.83 kg/hm2 under scenario 1.7:1, indicating that N in reclaimed water had higher availability than that in fertilizer, and DNDC performed well for evaluating cumulative N2O emissions on short-term reclaimed water irrigation.
Number of references:27
Main heading:Computer simulation
Controlled terms:Availability - Fertilizers - Groundwater - Irrigation - Nitrogen oxides - Reclamation - Soil moisture
Uncontrolled terms:Daily temperatures - Denitrification decompositions (DNDC) - DNDC models - Inorganic N fertilizer - Re-claimed water - Simulation parameters - Temporal variation - Winter wheat
Classification code:821.3 Agricultural Methods - 804.2 Inorganic Compounds - 804 Chemical Products Generally - 913.5 Maintenance - 723.5 Computer Applications - 452.4 Industrial Wastes Treatment and Disposal - 444.2 Groundwater - 483.1 Soils and Soil Mechanics
DOI:10.6041/j.issn.1000-1298.2013.09.014
Database:Compendex
41. Accession number:20134116842819
Title:Error compensation and design of roundness measurement and stenciling system for large diameter steel pipe
Authors:Li, Zhao1 ; Zhou, Xiaojun1 ; Xu, Yun1 ; He, Qiang1
Author affiliation:1 Department of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
Corresponding author:Zhou, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:272-278
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 satisfy the accuracy measurement demand of large diameter steel pipe, a gantry system for on-line measurement and stencil was designed. The coordinates of outer diameter points of the section could be measured by utilizing the vertical motion of laser sensor installed inside column of gantry. Coordinate of circle center was obtained by using least square method. The maximum and minimum of diameter were obtained by approximate diameter method, and then the roundness could be calculated. An example proved that the proposed system and data processing could be used to measure the outer diameter and roundness with high precision. Analysis of result showed that the gesture of steel was the main source of the error, which could be compensated through coordinate transformation and projection. It was verified the rationality of error analysis and the feasibility of compensation method. This system could be used for on-line measurement of large diameter steel pipe.
Number of references:12
Main heading:Steel pipe
Controlled terms:Data processing - Error compensation - Least squares approximations
Uncontrolled terms:Accuracy measurements - Co-ordinate transformation - Compensation method - Large diameter - Least square methods - On-line measurement - Roundness - Roundness measurement
Classification code:545.3 Steel - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 723.2 Data Processing and Image Processing - 921.6 Numerical Methods
DOI:10.6041/j.issn.1000-1298.2013.09.047
Database:Compendex
42. Accession number:20134116842774
Title:Effect of syngas on combustion and emission characteristic of gasoline engine
Authors:Dai, Xiaoxu1 ; Ji, Changwei1 ; Wang, Shuofeng1 ; Liang, Chen1 ; Ju, Bingjie1
Author affiliation:1 College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100124, China
Corresponding author:Ji, C. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:7-11
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 onboard fuel reforming could not only recovery the exhaust heat but also produce syngas for the mixed combustion in cylinders. An experimental study was carried out on a four-cylinder 1.6 L gasoline engine at a speed of 1800 r/min, a manifolds absolute pressure of 61.5 kPa and the maximum brake torque for the spark timing to explore the effect of syngas addition on the engine combustion and emission performances at the stoichiometric condition. The experimental results demonstrated that the hydrogen volume faction in syngas increased with the increase of syngas addition faction. The fuel consumption rate was decreased and the indicated thermal efficiency was improved. HC, NOx and CO2 emissions were reduced whereas CO emission was increased after the syngas enrichment at the stoichiometric condition.
Number of references:11
Main heading:Synthesis gas
Controlled terms:Carbon dioxide - Combustion - Engine cylinders - Engines - Ethanol - Gasoline - Particulate emissions - Waste heat
Uncontrolled terms:Combustion and emission performance - Emission characteristics - Exhaust heat recovery - Fuel consumption rates - Gasoline engines - Indicated thermal efficiency - Maximum brake torques - Syn-gas
Classification code:804 Chemical Products Generally - 803 Chemical Agents and Basic Industrial Chemicals - 643.1 Space Heating - 612.1.1 Internal Combustion Engine Components - 804.2 Inorganic Compounds - 612 Engines - 522 Gas Fuels - 521.1 Fuel Combustion - 451.1 Air Pollution Sources - 523 Liquid Fuels
DOI:10.6041/j.issn.1000-1298.2013.09.002
Database:Compendex
43. Accession number:20134116842790
Title:Optimization of premixing process of joint hydrogen production by straw and manure based on response surface method
Authors:Zhang, Zhiping1 ; Zhou, Xuehua1 ; Feng, Yipeng1 ; Wang, Yanjin1 ; Zhang, Quanguo1
Author affiliation:1 Key Laboratory of New Materials and Facilities for Rural Renewable Energy, Ministry of Agriculture, Henan Agricultural University, Zhengzhou 450002, China
Corresponding author:Zhang, Q. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:97-101
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 optimize the premixing process of the herbivorous livestock manure and straw for joint photosynthetic microorganisms hydrogen production, the method of Box-Benhnken experimental design and response surface analysis were used with Design-Expert software. The response surface experiments contained three factors, such as pH value, premixed temperature and premixed time. Response value was OD value and zero point experiments proceed three times. The response surface experiment data were analyzed by Design-Expert software, and the results showed that the quadratic model was the most accurate expression. The three factors existed significant correlation. The premixing process was optimized by the amendment of the regression equation: time of 6.3 d, the pH value of 4.9, temperature of 48°C, the estimated maximum OD value of 2.696 8. The predicted value was closed to the average value of the validation test. The results provided a theoretical basis for the experimental study of photosynthetic microorganism hydrogen production.
Number of references:17
Main heading:Design of experiments
Controlled terms:Agriculture - Experiments - Hydrogen production - Manures - Optimization - pH - Straw - Surface analysis
Uncontrolled terms:Cellulose decomposition - Photosynthetic microorganisms - Premixing - Quadratic modeling - Regression equation - Response surface - Response surface analysis - Response surface method
Classification code:921.5 Optimization Techniques - 901.3 Engineering Research - 821.5 Agricultural Wastes - 951 Materials Science - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 522 Gas Fuels - 423 Non Mechanical Properties and Tests of Building Materials - 801.1 Chemistry, General
DOI:10.6041/j.issn.1000-1298.2013.09.018
Database:Compendex
44. Accession number:20134116842793
Title:CO2/CH4 separation performance and CoAPSO-5 Zeolite membrane preparation
Authors:Yang, Wenshen1 ; Lang, Lin1 ; Wang, Fengchan1 ; Yin, Xiuli1 ; Wu, Chuangzhi1
Author affiliation:1 Key Laboratory of Renewable Energy and Natural Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, China
Corresponding author:Yin, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:114-117
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:The CoAPSO-5 membrane on the α-Al2O3 substrate was synthesized by using in situ crystallization. According to detection results of scanning electron microscopy (SEM) and X-ray diffraction (XRD), the 20 μm thick membrane was composed of well-intergrown CoAPSO-5 crystals, which were tightly covered on the α-Al2O3 substrate in random orientation. The gas permeation measurements revealed the resulting membrane was of high-quality with few non-zealitic pores. In addition, the separation property of CO2/CH4 through the synthesized CoAPSO-5 membrane was investigated. When the osmotic pressure was 0.3 MPa and 0.5 MPa, the real separation factor of CO2/CH4 was 4.86 and 5.29 respectively.
Number of references:17
Main heading:Carbon dioxide
Controlled terms:Crystal orientation - Hydrothermal synthesis - Membranes - Scanning electron microscopy - Separation - X ray diffraction
Uncontrolled terms:CoAPSO-5 - Gas permeation measurements - In-situ crystallization - Random orientations - Separation factors - Separation performance - Separation Property - Zeolite membrane
Classification code:741.1 Light/Optics - 802.2 Chemical Reactions - 802.3 Chemical Operations - 804.2 Inorganic Compounds - 933.1.1 Crystal Lattice - 951 Materials Science
DOI:10.6041/j.issn.1000-1298.2013.09.021
Database:Compendex
45. Accession number:20134116842791
Title:Delignification kinetics of wheat straw pretreated with propionic acid
Authors:Tian, Long1, 2 ; Ma, Xiaojian2
Author affiliation:1 School of Life Sciences and Technology, Nanyang Normal University, Nanyang 473061, China
2 College of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China
Corresponding author:Ma, X. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:102-106
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 reaction course and delignification kinetics of wheat straw pretreated with propionic acid was studied. The results showed that two distinct delignification phases occurred during this pulping process of wheat straw, which were the initial delignification phase from the beginning to 60 min and the residual delignification phase from 60 min to 180 min. The rate constant and the order of reaction were determined through the establishment of kinetic equation in delignification reaction. Under the temperature of 333 K, 343 K, 353 K, 363 K, the rate constants were 0.002 3, 0.002 8, 0.003 7 and 0.005. And the reaction order was the first grade. In the range of temperature and time under which the experiment was carried out, the average active energy was 26.05 kJ/mol, the frequency constant was 26.797 L/(mol·min).
Number of references:14
Main heading:Reaction kinetics
Controlled terms:Delignification - Integral equations - Kinetics - Lignin - Propionic acid - Rate constants - Saturated fatty acids - Straw
Uncontrolled terms:Delignification reactions - Frequency constant - Kinetic equations - Order of reaction - Pre-Treatment - Pulping process - Reaction course - Wheat straws
Classification code:931 Classical Physics; Quantum Theory; Relativity - 921.2 Calculus - 821.5 Agricultural Wastes - 815.1.1 Organic Polymers - 811.1.1 Papermaking Processes - 804.1 Organic Compounds - 801.4 Physical Chemistry
DOI:10.6041/j.issn.1000-1298.2013.09.019
Database:Compendex
46. Accession number:20134116842811
Title:Estimation of forest parameter and biomass for individual pine trees using airborne LiDAR
Authors:Liu, Feng1 ; Tan, Chang1 ; Zhang, Gui1 ; Liu, Jingxuan1
Author affiliation:1 School of Science, Central South University of Forestry and Technology, Changsha 410004, China
Corresponding author:Liu, F. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:219-224 242
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 LiDAR point cloud and a survey of seven plots Larix olgensis plantation in Changbai Mountain area of Heilongjiang were utilized as the experimental data. A method combined crow height model and 3-D point cloud segmentation was used to identify individual tree. The forest parameters and aboveground biomass based were estimated by using stepwise regression analysis. Experimental results showed that the forest parameters estimated by LiDAR had good correlation with field data. The coefficient of determination between prediction values and observed values of the tree height, crown diameter, DBH and aboveground biomass were 0.873 2, 0.633 5, 0.790 3 and 0.799 2, respectively. The average fitting accuracy was 88.34%, 83.46%, 85.11% and 86.19%, respectively. The average biomass of young, half mature, near mature and mature Larix olgensis were 25.12, 94.08, 117.74 and 279.33 kg, respectively.
Number of references:20
Main heading:Parameter estimation
Controlled terms:Biomass - Estimation - Forestry - Optical radar
Uncontrolled terms:Above ground biomass - Changbai Mountains - Coefficient of determination - Individual tree - Larix olgensis - Lidar point clouds - Point cloud segmentation - Stepwise regression analysis
Classification code:716.2 Radar Systems and Equipment - 731.1 Control Systems - 821.0 Woodlands and Forestry - 821.5 Agricultural Wastes - 921 Mathematics
DOI:10.6041/j.issn.1000-1298.2013.09.039
Database:Compendex
47. Accession number:20134116842806
Title:3-D reconstruction and measurement of greenhouse strawberry canopy based on ultrasonic sensors
Authors:Qi, Lijun1 ; Liang, Xia1 ; Ji, Ronghua2 ; Wang, Jun3 ; Li, Hui1 ; Wang, Pei1
Author affiliation:1 College of Engineering, China Agricultural University, Beijing 100083, China
2 College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
3 Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
Corresponding author:Qi, L. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:193-197
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 crop canopy 3-D reconstruction and volume measurement method that based on the ultrasonic sensing technology was proposed. The functions of interp1(), quad and surf in Matlab were introduced for crop canopy description and the volume calculation. Indoor measurements were conducted on six ridges of greenhouse strawberry by 3 times repeats and the results were compared with manual measurement. The result showed the experiments presented good repeatability(R2 was 0.927 5, RMSE was 0.135 8 m3), which showed consistent with the manual measurement (R2 is 0.941 1, RMSE was 0.134 5 m3). Therefore, the proposed measuring system was stabilized and feasible.
Number of references:11
Main heading:Three dimensional
Controlled terms:Crops - Fruits - Greenhouses - Ultrasonic sensors - Volume measurement
Uncontrolled terms:3D reconstruction - Crop canopy - Indoor measurement - Manual measurements - Measuring systems - Strawberry canopy - Ultrasonic sensing - Volume calculation
Classification code:753.2 Ultrasonic Devices - 821.4 Agricultural Products - 821.6 Farm Buildings and Other Structures - 902.1 Engineering Graphics - 943.2 Mechanical Variables Measurements
DOI:10.6041/j.issn.1000-1298.2013.09.034
Database:Compendex
48. Accession number:20134116842803
Title:Nondestructive detection of citrus defection using hyper-spectra imaging technology
Authors:Zhang, Hailiang1, 2 ; Gao, Junfeng1 ; He, Yong1
Author affiliation:1 School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
2 School of Mechatronics Engineering, East China Jiaotong University, Nanchang 330013, China
Corresponding author:He, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:177-181
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:A hyperspectral imaging system was developed for detecting various common defects on citrus. Citrus with end rot, insect dot damage, rot damage, thrip scars and normal citrus were chosen. Hyperspectral images of citrus samples and principal component analysis (PCA) were used to confirm two best wavelengths (615 nm and 680 nm). PC2 of PCA was selected to classify the images. Finally, the detection algorithm combined PCA and band ratio was developed and achieved an accuracy of 94%. The results showed the feasibility of the proposed method.
Number of references:18
Main heading:Spectroscopy
Controlled terms:Principal component analysis
Uncontrolled terms:Citrus - Defect detection - Detection algorithm - Hyper-spectral images - Hyperspectral Imaging - Hyperspectral imaging systems - Imaging technology - Nondestructive detection
Classification code:801 Chemistry - 922.2 Mathematical Statistics
DOI:10.6041/j.issn.1000-1298.2013.09.031
Database:Compendex
49. Accession number:20134116842794
Title:Research progress in effect of high hydrostatic pressure on texture of fruit and vegetable products
Authors:Yao, Jia1 ; Hu, Xiaosong1 ; Liao, Xiaojun1 ; Zhang, Yan1
Author affiliation:1 College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
Corresponding author:Zhang, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:118-124 117
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:For high hydrostatic pressure (HHP) had a dual role in preserving texture properties, the relationship between the texture of fruit and vegetable products and cell structure were reviewed. On that basis, the mechanism about how high pressure affects the fruit and vegetable texture was clarified from three levels of cell structure. Furthermore, based on the comprehensive analysis of a large body of literature, the research progress of high pressure on the texture of fruit and vegetable products was summarized. At last, the research direction in the field was pointed out so as to provide the ideas on how to improve the texture of fruit and vegetable products.
Number of references:63
Main heading:Textures
Controlled terms:Fruits - Hydrostatic pressure - Research - Vegetables
Uncontrolled terms:Cell structure - Comprehensive analysis - Dual role - Fruit and vegetables - High hydrostatic pressure - High pressure - Texture properties
Classification code:631.1.1 Liquid Dynamics - 821.4 Agricultural Products - 901.3 Engineering Research - 933 Solid State Physics
DOI:10.6041/j.issn.1000-1298.2013.09.022
Database:Compendex
50. Accession number:20134116842782
Title:PIV investigate of inner flow of fluidic component with small offset ratio
Authors:Wang, Chao1 ; Li, Hong1 ; Wu, Yanlan1 ; Zou, Chenhai1 ; Xu, Dehuai1
Author affiliation:1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Li, H. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:51-55
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:The inner flow of fluidic component with small offset ratio was measured by using particle image velocimetry (PIV). The velocity distribution of fluidic component and position of attachment point were obtained to provide reference for the numerical simulation in the future. The effects of flow rate, offset ratio, distance of air entrance hole, and cover size on the inner flow of fluidic component were analyzed and compared with numerical results. The results showed that in a certain range, the flow rate and working pressure had no effect on the distance of attachment point. The attachment point ratio increased with the increasing offset ratio. The relation equation of attachment point ratio and offset ratio was found. The distance of attachment point became shorter firstly then longer with the increasing distance of air entrance hole. The offset ratio and cover size were sensitive to offset jet flow.
Number of references:13
Main heading:Flow rate
Controlled terms:Computer simulation
Uncontrolled terms:Attachment points - Fluidic components - Numerical results - Offset jet - Offset ratio - Particle image velocimetries - PIV investigation - Working pressures
Classification code:631 Fluid Flow - 723.5 Computer Applications
DOI:10.6041/j.issn.1000-1298.2013.09.010
Database:Compendex
51. Accession number:20134116842812
Title:Advancement and trend of LED light environment control technology for intensive poultry production
Authors:Pan, Jinming1 ; Wang, Xiaoshuang1 ; Jiang, Jingsong1 ; Yu, Yonghua1 ; Chen, Xianhui2
Author affiliation:1 School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
2 Zhejiang Guangda Breeding Poultry Corporation, Jiaxing 314423, China
Corresponding author:Yu, Y. ([email protected])
Source title:Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title:Nongye Jixie Xuebao
Volume:44
Issue:9
Issue date:September 2013
Publication year:2013
Pages:225-235
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 innovative area is forming rapidly with the application of LED (light emitting diode) light sources in the intensive production of poultry which has a highly developed visual system. Firstly, the article reviewed the advancement on LED light environment control technology for intensive poultry production. For broilers, the optimization of LED light color, intensity and photoperiod could improve the structure of small intestinal mucosal and consequently enhance the feed utilization and growth rate. The light environment could also affect the satellite cell proliferation, muscle fiber development and behavior activities to meliorate the carcass characteristic, meat quality and the health, which helped to strengthen the immunity, reduce the mortality and disease incidence. For laying hens and breeders, the light conditions could promote the sex maturity, age at first egg and lay rate by increasing the release of luteinizing hormone and follicle stimulating hormone. Besides, the egg quality, pecking, fertility and hatchability of breeders were improved by providing suitable lights. Finally, the development trends of LED light environment control for intensive poultry production were presented by the analysis of current status and issues.
Number of references:82
Main heading:Light emitting diodes
Controlled terms:Cell proliferation - Light sources - Neurons - Plants (botany)
Uncontrolled terms:Development trends - Disease incidence - Follicle stimulating hormone - Light conditions - Light environment - Luteinizing hormones - Poultry production - Satellite cells
Classification code:461.9 Biology - 741.1 Light/Optics - 744 Lasers
DOI:10.6041/j.issn.1000-1298.2013.09.040
Database:Compendex
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