<RECORD 1>

Accession number:20124215569768
Title:Analysis on kinematic principle for seedling-picking machinery of rice transplanter with deformed oval gears
Authors:Xu, Hongguang (1); Zhao, Yun (1); Zhang, Yunhui (1); Zhao, Xiong (1)
Author affiliation:(1) Faculty of Mechanical Engineering and Automation, Zhejiang Sci.-Tech. University, Hangzhou 310018, China
Corresponding author:Zhao, Y.(zhaoyun@zstu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:9-15
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to fulfill the work requirements of rice transplanter, a new kind of seedling-picking machinery was designed. A new form of planetary gearing system that composed with deformed oval gears was introduced. Kinematics model was established based on kinematics particularity of deformed-oval-gear planetary gearing system. A secondary analysis and optimization software of seedling-picking machinery was developed autonomously. The parameters of picking seedling machinery could be optimized by this optimization software in interactive optimization methods, and a set of structural parameters were obtain and the virtual simulation was accomplished, it showed that the shape of static locus from the seedling-picking machinery appeared like a peach with a sharp point. This locus can meet the work requirements of rice transplanter.
Number of references:20
Main heading:Gears
Controlled terms:Computer software - Design - Kinematics - Machine design - Machinery - Mechanisms - Optimization - Wheels
Uncontrolled terms:Interactive optimization - Kinematics models - New forms - Optimization software - Planetary gear train - Planetary gearings - Rice transplanter - Structural parameter - Transplanters - Virtual simulations  - Work requirements
Classification code:408 Structural Design - 601 Mechanical Design - 723 Computer Software, Data Handling and Applications - 921.5 Optimization Techniques - 931.1 Mechanics
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 2>

Accession number:20124215567608
Title:Assessment of land use effects on environmental vulnerability by ecological niche suitability model
Authors:Wang, Ruiyan (1); Zhao, Gengxing (1); Yu, Zhenwen (2); Zhang, Yuting (3); Zhang, Haiyang (1)
Author affiliation:(1) College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China; (2) College of Agronomy, Shandong Agricultural University, Tai'an 271018, China; (3) Soil and Fertilizer Working Station of Kenli County, Kenli 257041, China
Corresponding author:Yu, Z.(yuzw@sdau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:218-224
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Land use has important effects on environmental vulnerability. The better the land use matches the habitat, the lower the impact value of land use on environmental vulnerability will be. This paper aims to quantify the land use effects on environmental vulnerability by ecological niche suitability model. The agricultural land of Kenli county in the Yellow River Delta was selected for the case-study. The samples were chosen by investigation to establish the niche suitability model of various land use types, and niche suitability value of each land use ecological unit was obtained through comparing the optimum ecological environment conditions with the present situation. The results showed that the land use effects on the environmental vulnerability in Kenli county were good in general, and the cotton field actually determined the environmental vulnerability development of the county; The relationship of land use intensity and the environment vulnerability effect appeared a positive correlation trend; The irrigation and salinity were the dominant environmental factors in land use environmental vulnerability effect. The results of the research are of important significance to the land use management, land degradation prevention and improvement of the ecological environment.
Number of references:22
Main heading:Ecology
Controlled terms:Land use - Models
Uncontrolled terms:Agricultural land - Ecological environments - Ecological niche - Ecological units - Environmental factors - Environmental vulnerability - Impact value - Land degradation - Land use type - Land-use management  - Positive correlations - Present situation - Yellow River delta
Classification code:403 Urban and Regional Planning and Development - 454.3 Ecology and Ecosystems - 902.1 Engineering Graphics
DOI:10.3969/j.issn.1002-6819.2012.11.035
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 3>

Accession number:20124215567594
Title:Effects of varieties and planting density on plant traits and water consumption characteristics of spring maize
Authors:Liu, Zhandong (1); Xiao, Junfu (1); Yu, Jingchun (2); Liu, Zugui (1); Nan, Jiqin (1)
Author affiliation:(1) Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; (2) Jianping Irrigation Experimental Station, Jianping 122400, China
Corresponding author:Xiao, J.(xiaojunfu61@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:125-131
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Varieties and planting density are reference basis for water saving and high-yielding cultivation of spring maize in Western Liaoning. Taking the low seeding density cultivar DY12 and high density type cultivar ZD77 as experimental materials, a field experiment was conducted to evaluate the effects of four planting densities on plant traits, water consumption, ear characters, yield and water use efficiency (WUE) of spring maize, and the differences in all characters between the two types of varieties were analyzed. The results showed that with the increase of planting density, the stem diameter, the leaf area per plant of ZD77 and DY12 decreased gradually, their plant heights, the leaf area index (LAI) increased gently, and the stem diameter of DY12 and plant height of ZD77 in different planting densities reached a significant difference respectively (P&lt;0.05). Under the same planting density condition, plant height and stem diameter of DY12 were higher than that of ZD77, while LAI of the ZD77 was larger than that of DY12, thus ZD77 showed a strong resistance to the high density planting. With the planting density increasing, water consumption during the whole growth period of both varieties increased, but water consumption of ZD77 was lower than that of DY12 under the same planting density condition. With the increase of planting density, yield increased first and then decreased. The effects of planting densities on ear diameter, row numbers and 100-grain weight for DY12 were not obvious, and the differences in other yield characters of different planting densities reached significant levels (P&lt;0.05), while the effects of planting densities on each yield characters of ZD77 were not significant. With the increase of planting density, the WUE of DY12 increased first and then decreased, and when the planting density was 45000 plants/hm², its WUE reached the maximum (2.48 kg/m³). The WUE of ZD77 showed a decreasing trend with the planting density. High density type varieties of spring maize should be selected to plant with reasonable planting density in the production of this area, so the results of water-saving and yield-increasing can be achieved significantly.
Number of references:30
Main heading:Water supply
Controlled terms:Experiments - Moisture - Soils - Water conservation
Uncontrolled terms:Plant trait - Planting density - Spring maize - Variety - Water consumption - Water use efficiency
Classification code:444 Water Resources - 446.1 Water Supply Systems - 483.1 Soils and Soil Mechanics - 801.4 Physical Chemistry - 901.3 Engineering Research
DOI:10.3969/j.issn.1002-6819.2012.11.021
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 4>

Accession number:20124215567611
Title:Comparison of diffuse reflection and transmission mode of visible/near infrared spectroscopy for detecting black heart of potato
Authors:Zhou, Zhu (1); Li, Xiaoyu (1); Gao, Hailong (1); Tao, Hailong (1); Li, Peng (1)
Author affiliation:(1) College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Corresponding author:Li, X.(lixiaoyu@mail.hzau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:237-242
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The objective of this research was to compare transmission and diffuse reflection modes of visible (VIS)/near infrared (NIR) spectroscopy for detecting black heart in potatoes. Vis/NIR spectra, Vis/NIT spectra and NIR spectra were acquired using hyperspectral image acquisition system, portable transmission spectrum acquisition system and FT-NIR spectrometer, respectively. Partial Least Squares-Linear Discriminant Analysis (PLS-LDA) method was employed to classify the potatoes with or without black heart. Better results were obtained based on Vis/NIT spectra than those on diffuse reflection spectra. The classifying correct rate was 98.46% by using Vis/NIT spectra. The classifying correct rates were 92.31% and 90.77% respectively acquired by hyperspectral image spectrum acquisition system and FT-NIR spectrometer. The results indicated that Vis/NIT spectra method was feasible for detecting black heart in potatoes and transmission mode was better than reflection mode for internal disorder detection. The research can provide references for potato internal defect detection and portable instrument development based on spectroscopy technique.
Number of references:24
Main heading:Heart
Controlled terms:Infrared devices - Infrared spectrometers - Infrared spectroscopy - Models - Near infrared spectroscopy - Optimization - Spectrometers
Uncontrolled terms:Acquisition systems - Diffuse reflection - Diffuse reflection spectra - Hyper-spectral images - Hyperspectral Imaging - Internal defect detection - NIR spectrum - Portable instrument - Potato - Reflection modes  - Transmission mode - Transmission spectrums - Visible/near infrared spectroscopy
Classification code:461.2 Biological Materials and Tissue Engineering - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 902.1 Engineering Graphics - 921.5 Optimization Techniques
DOI:10.3969/j.issn.1002-6819.2012.11.038
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 5>

Accession number:20124215567616
Title:Shrinkage characteristics of macadamia nuts shell during hot-air drying
Authors:Li, Jianhuan (1); Yang, Wei (1)
Author affiliation:(1) Faculty of Modern Agriculture Engineering, Kunming University of Science and Technology, Kunming 650500, China
Corresponding author:Yang, W.(yw201062@hotmail.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:268-273
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The shrinkage characteristics of macadamia nuts shell were studied in this paper. The shrinkage curve, linear strain and linear moisture expansion coefficient of shell were obtained by experiments. The shrinkage equation to calculate the outer diameter and shrinkage of every element layer in different drying periods was established. The results show that the shrinkage of each direction is different. The linear strain in width direction is smallest, while the ones in horizontal direction are largest. Furthermore, the linear strain of shell increase with decrease of the moisture content. The external shrinkage is greater than the internal one. The shrinkage increases nonlinearly with decrease of the moisture content. The shrinkage equation was verified by comparison of outer diameters of macadamia nuts shell computed by shrinkage equation with experimental data, which maximum error was 5.83%. The results can provide a reference for processing of macadamia nuts.
Number of references:18
Main heading:Shrinkage
Controlled terms:Drying - Moisture - Moisture determination - Shells (structures)
Uncontrolled terms:Equation - Hot air drying - Linear strains - Macadamia nuts - Maximum error - Moisture expansion coefficients - Outer diameters - Shells - Shrinkage characteristic
Classification code:408.2 Structural Members and Shapes - 642.1 Process Heating - 801.4 Physical Chemistry - 944.2 Moisture Measurements - 951 Materials Science
DOI:10.3969/j.issn.1002-6819.2012.11.043
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 6>

Accession number:20124215567602
Title:Environmental control system based on IOT for nursery pig house
Authors:Zhu, Weixing (1); Dai, Chenyun (1); Huang, Peng (1)
Author affiliation:(1) School of Electronic and Information Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Zhu, W.(wxzhu@ujs.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:177-182
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The microclimate environment in nursery pig house is important. In this thesis, an environmental control system based on internet of things (IOT) for nursery pig house was designed. In order to adjust the local microclimate environment in precise, wireless network of equipments like sensors and electronic hot plates were constructed. The network was based on ZigBee protocol. ARM embedded web server was used as control center. Management operation could extend from remote user into the nursery pig houses to realize the exchange of information between the environment and devices, as well as between the environment and remote user. B/S (Browser/Server) structure was used in the system, which could greatly simplify the client computer load and reduce system maintenance. The experimental results showed that the performance of the system was quite stable and the system satisfies the design requirements in real-time data acquisition wirelessly, environmental automatic control and environmental visualization control remotely. The monitoring system is suitable for precision environmental management for nursery pig house and has a good application prospect in automatic and intelligent livestock breeding industry.
Number of references:29
Main heading:Agriculture
Controlled terms:Automation - Control - Embedded systems - Environmental engineering - Environmental management - Internet - Monitoring - Wireless networks
Uncontrolled terms:Application prospect - Browser/server - Control center - Design requirements - Embedded Web servers - Environmental control system - Environmental visualization - Exchange of information - Hot plates - Internet of Things (IOT)  - Livestock breeding - Management operation - Monitoring system - Pig house - Real-time data acquisition - Remote users - System maintenance - ZigBee wireless networks
Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 731 Automatic Control Principles and Applications - 732 Control Devices - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 941 Acoustical and Optical Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 723 Computer Software, Data Handling and Applications - 718 Telephone Systems and Related Technologies; Line Communications - 717 Optical Communication - 716.3 Radio Systems and Equipment - 716 Telecommunication; Radar, Radio and Television - 454 Environmental Engineering - 722 Computer Systems and Equipment
DOI:10.3969/j.issn.1002-6819.2012.11.029
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 7>

Accession number:20124215567598
Title:Image recognition of navel orange diseases and insect pests based on compensatory fuzzy neural networks
Authors:Wen, Zhiyuan (1); Cao, Leping (2)
Author affiliation:(1) College of Science, Hunan Agricultural University, Changsha 410128, China; (2) Office of Academic Affairs, Hunan Biological and Electromechanical Polytechnic, Changsha 410127, China
Corresponding author:Cao, L.(clp4218@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:152-157
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to develop a universal machine vision algorithm to identify disease and pests of naval orange, blue component of images of naval orange with disease and insect pests was processed with background removed to detect and extract the boundary of disease and insect pests symptoms with improved watershed algorithm. With this boundary the disease and insect pests areas of the original color image were marked. Red, green, and blue components in marked area were used to characterize the color features, and boundary fractal dimension of disease and insect pests area was taken as the shape feature. With the four feature values as compensatory fuzzy neural networks (CFNN) inputs, the CFNN mapper was established to identify diseases and insect pests. The test results showed that the average recognition correctness rate was up to 85.51% for four kinds of plant diseases and insect pests and mechanical damage. This method can be used to identify navel oranges plant diseases and insect pests.
Number of references:21
Main heading:Computer vision
Controlled terms:Fractal dimension - Fruits - Fuzzy neural networks - Image recognition
Uncontrolled terms:Boundary fractal dimension - Color features - Color images - Compensatory fuzzy neural network - Correctness rates - Feature values - Insect pest - Mechanical damages - Navel orange - Plant disease  - Shape features - Universal machines - Water-shed algorithm
Classification code:716 Telecommunication; Radar, Radio and Television - 723.4 Artificial Intelligence - 723.5 Computer Applications - 821.4 Agricultural Products - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.11.025
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 8>

Accession number:20124215567580
Title:Analysis on seed movement in seed chamber of clamping dibber wheel
Authors:Wang, Jikui (1); Guo, Kangquan (2); L&#252;, Xinmin (2)
Author affiliation:(1) College of Mechanical and Electronic Engineering, Shihezi University, Shihezi 832003, China; (2) College of Mechanical and Electronic Engineering, Northwest Agriculture and Forestry University, Yangling 712100, China
Corresponding author:Wang, J.(shzwjk@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:35-39
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The seed movement as a whole in the vertical cylinder seed chamber of clamping dibbler wheel has important effects on precision seeding of the dibbler wheel. The purpose of this work was to disclose the law of seed movement in the seed chamber by methods of mechanical analysis and experiment. Seeds as a whole in the seed chamber are forced by two torques relative to the centre point of the seed chamber, which are clockwise and anticlockwise torques, when dibbler wheel rotates. The clockwise torque makes the seed population to slip down on the inner side of the chamber, and the anticlockwise torque makes the seed population to rise and do circular motion around the centre point of seed chamber. When values of the two torques are equal, the depth of seed in the seed chamber is called seed slipping critical depth. Given that seed depth in the seed chamber is lower than seed slipping critical depth, seeds will slip on the inner side of the seed chamber as a whole; otherwise, seeds will go up along the inner side of seed chamber. The experiment showed that the seed critical depth was 0.05 m when seeding devices were not equipped in seed chamber, and the seed critical depth was 0.01 m when seeding devices were equipped.
Number of references:18
Main heading:Wheels
Controlled terms:Calculations - Clocks - Cylinders (shapes) - Experiments - Kinematics - Seed - Torque
Uncontrolled terms:Circular motion - Critical depth - Force analysis - Mechanical analysis - Vertical cylinders
Classification code:931.1 Mechanics - 921 Mathematics - 901.3 Engineering Research - 821.4 Agricultural Products - 943.3 Special Purpose Instruments - 723 Computer Software, Data Handling and Applications - 601.2 Machine Components - 421 Strength of Building Materials; Mechanical Properties - 408.2 Structural Members and Shapes - 721 Computer Circuits and Logic Elements
DOI:10.3969/j.issn.1002-6819.2012.11.006
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 9>

Accession number:20124215567607
Title:Effects of salinity on treatment of aquaculture wastewater by dynamic membrane bioreactor with intermittent aeration
Authors:Hong, Junming (1); Lu, Fangfang (1); Yin, Juan (1)
Author affiliation:(1) College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
Corresponding author:Hong, J.(jmhong@hqu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:212-217
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Salts are detrimental to biological treatment systems by causing plasmolysis and/or loss of cell activities, thereby the biological treatment of mariculture wastewater which with high sanity is difficult. A dynamic membrane bioreactor (DMBR) with intermittent aeration was used to treat aquaculture wastewater under different salinity. The effects of salinity on organic matter degradation and denitrification process were studied. The results show that when salinity increased from 0 to 35 g/L, the COD<inf>Mn</inf> removal rate and TN removal rate by intermittent aeration dynamic membrane bioreactor for treating aquaculture wastewater reduced from 89.5% to 75.5% and from 89.9% to 74.4%, respectively. Because of the inhibition effect of salt on microorganism, the organic matter degradation and denitrification efficiency decreased in saliferous condition. Moreover, in the salt concentration of 0-35 g/L, the constants of COD<inf>Mn</inf> and NO<inf>3</inf>^--N reduction rate in the reactor decreased linearly with the improvement of salinity by kinetic analysis, and the coefficients of determination (r²) of linear regression models were 0.9838 and 0.9665, respectively. Salt has stronger inhibit effect on denitrification process than organic matter degradation process of aquaculture wastewater.
Number of references:24
Main heading:Wastewater treatment
Controlled terms:Aquaculture - Biochemical engineering - Biogeochemistry - Biological materials - Bioreactors - Denitrification - Manganese - Manganese removal (water treatment) - Marine biology - Organic compounds  - Rate constants - Regression analysis - Salinity measurement - Waste disposal
Uncontrolled terms:Aquaculture wastewater - Biological treatment - Biological treatment systems - Cell activity - Degradation process - Denitrification process - Dynamic membranes - Inhibition effect - Intermittent aeration - Kinetic analysis  - Linear regression models - Plasmolysis - Reduction rate - Removal rate - Salt concentration
Classification code:821.3 Agricultural Methods - 805.1.1 Biochemical Engineering - 804.1 Organic Compounds - 802.2 Chemical Reactions - 802.1 Chemical Plants and Equipment - 922.2 Mathematical Statistics - 543.2 Manganese and Alloys - 461 Bioengineering and Biology - 452.4 Industrial Wastes Treatment and Disposal - 445.1 Water Treatment Techniques - 444 Water Resources - 481.2 Geochemistry
DOI:10.3969/j.issn.1002-6819.2012.11.034
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 10>

Accession number:20124215567581
Title:Structure design and simulation of circular ring piezoelectric peristaltic pump
Authors:Liang, Li (1); Ma, Xu (1); Zhang, Tiemin (1)
Author affiliation:(1) College of Engineering, South China Agricultural University, Guangzhou 510642, China
Corresponding author:Ma, X.(maxu1959@scau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:40-44
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:This paper aims to further explore the application of piezoelectric technology in peristaltic pump to made it further develop towards simple structure, small size and light weight and be used in broader areas. Combined with piezoelectric driven technology, the paper proposed a new type of circular ring piezoelectric peristaltic pump driven by circumferential traveling-wave based on the existing mechanical peristaltic pump structure. Its peristaltic stator is a ring and piezoelectric ceramic chips are bonded to the inner ring. Under the reactions of outer and inner rings, the stator produces peristalsis driven by circumferential traveling-wave along the torus, instead of the mechanical peristaltic pump which uses electromagnetic motor to drive eccentric pump to realize peristalsis. According to the elastic mechanics and vibration theory, the vibration formula was derived. The model of circular stator was built by using finite element analysis software, and the vibration mode in the circumferential direction and the driving mechanism were made by finite element analysis. Based on the consequences, the vibration mode of stator for circular ring piezoelectric peristaltic pump was confirmed, the whole structure was designed, and the working mechanism was simulated. The results show that the new type of piezoelectric peristaltic pump has both advantages of the mechanical peristaltic pump and the piezoelectric pump.
Number of references:31
Main heading:Pumps
Controlled terms:Computer simulation - Crystallography - Design - Finite element method - Physiology - Piezoelectric ceramics - Piezoelectric devices - Piezoelectricity - Stators
Uncontrolled terms:Circular ring - Circumferential direction - Driving mechanism - Elastic mechanics - Electro-magnetic motors - Finite element analysis software - Inner rings - Light weight - Peristaltic pump - Piezoelectric pump  - Piezoelectric technology - Simple structures - Structure design - Traveling wave - Vibration modes - Vibration theory - Working mechanisms
Classification code:933.1 Crystalline Solids - 921.6 Numerical Methods - 812.1 Ceramics - 723.5 Computer Applications - 714 Electronic Components and Tubes - 705.1 Electric Machinery, General - 704 Electric Components and Equipment - 701.1 Electricity: Basic Concepts and Phenomena - 618.2 Pumps - 461.9 Biology - 408 Structural Design
DOI:10.3969/j.issn.1002-6819.2012.11.007
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 11>

Accession number:20124215567618
Title:Optimization of adsorption conditions for apple polyphenols by aminated magnetic chitosan microspheres
Authors:Yuan, Yahong (1); Cai, Luyang (1); Yue, Tianli (1); Gao, Zhenpeng (1); Zhao, Xubo (1)
Author affiliation:(1) College of Food Science and Engineering, Northwest Agriculture and Forest University, Yangling 712100, China
Corresponding author:Yuan, Y.(yuan324@msn.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:279-286
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The aim of this study was to provide a new and feasible way for separation apple polyphenols (AP), and to study the influence of AP by chitosan magnetic materials. Fe<inf>3</inf>O<inf>4</inf> particles were synthesized by coprecipitation. Magnetic chitosan microspheres were prepared by inverse suspension cross-linking, and analized through SEM and laser particle size analyzer after aminated. Then, apple polyphenols were adsorbed using the aminated magnetic chitosan microspheres. The single-factor experiment and response surface method were applied to optimize the adsorption factors of AP. Process parameters of AP separation by aminated magnetic chitosan microspheres had significant effect on adsorption rate of AP. The influence order of factors was: usage of microspheres&gt;shaker speed&gt;adsorption temperature. The optimum adsorption conditions of AP by aminated magnetic chitosan microspheres were as follows: usage of microspheres 0.25 g/mL, adsorption temperature 45&deg;C, shaker speed 127 r/min, and under this condition, the adsorption rate could reached to 81.58%. The combination of chitosan and Fe<inf>3</inf>O<inf>4</inf> magnetic material had a good adsorption performance and quick separation of AP. The results of the research can provide a theoretical reference for the adsorption of AP by magnetic materials.
Number of references:30
Main heading:Adsorption
Controlled terms:Chitosan - Fruits - Magnetic materials - Microspheres - Optimization - Particle size analysis - Phenols - Separation - Suspensions (fluids)
Uncontrolled terms:Adsorption performance - Adsorption rates - Adsorption temperature - Inverse suspension cross-linking - Laser particle size analyzer - Magnetic chitosan - Modification - Polyphenols - Process parameters - Response surface method
Classification code:921.5 Optimization Techniques - 821.4 Agricultural Products - 818 Rubber and Elastomers - 951 Materials Science - 804.1 Organic Compounds - 802.3 Chemical Operations - 708.4 Magnetic Materials - 804 Chemical Products Generally
DOI:10.3969/j.issn.1002-6819.2012.11.045
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 12>

Accession number:20124215567613
Title:Curing mechanism of modified soy-based adhesive and optimized plywood hot-pressing technology
Authors:Chen, Nairong (1); Lin, Qiaojia (1); Bian, Liping (1)
Author affiliation:(1) College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 35002, China
Corresponding author:Lin, Q.(linqj208@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:248-253
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to reduce usage of formaldehyde content adhesives and popularize environment friendly adhesive application in plywood, the modified soy-based adhesive (SBA) was prepared as a new kind of waterproof adhesive to make plywood. The hot-press conditions were optimized by using orthogonal experimental design. The curing mechanism of soy-based adhesive was investigated by FTIR, XPS and TG-DTG. The results showed that (i) hot-press temperature, pressure and time could affect the bonding strength and the contribution order was hot-press temperature &gt; hot-press pressure &gt; hot-press time; (ii) under the optimized conditions (hot-press temperature 140&deg;C, hot-press pressure 1.0 MPa and hot-press time 4.69 min), the water-resistant bonding strength of plywood was up to 0.91 MPa, which meets the requirement of plywood type II in GB/T 9846-2004. Fourier transform infrared spectroscopy (FTIR) analysis showed the SBA was crosslinked by chemical reaction during the curing process, the crosslinking gave rise to the increase of amino bonds and reduce of hydrophilic groups. X-ray photoelectron spectroscopy (XPS) analysis showed that during the curing process amide reaction occurred and accompanied with amination which induced the formation of 3D structure of SBA. And the TG-DTG results showed that SBA cured completely when the temperature was in the range of 140-150&deg;C, above this range it could result in decomposition of SBA. The research can provide a reference for SBA application in plywood industry.
Number of references:27
Main heading:Presses (machine tools)
Controlled terms:Amides - Amination - Compression ratio (machinery) - Curing - Diamond cutting tools - Diffusion bonding - Fourier transform infrared spectroscopy - Mechanisms - Optimization - Photoelectrons  - Plywood - Wood products - X ray photoelectron spectroscopy
Uncontrolled terms:3D Structure - Adhesive applications - Bonding strength - Crosslinked - Curing mechanism - Curing process - Environment friendly - FTIR - Hot-press conditions - Hot-press temperature  - Hydrophilic groups - Optimized conditions - Orthogonal experimental design - Plywood industry - Type II
Classification code:921.5 Optimization Techniques - 812.1 Ceramics - 811.2 Wood and Wood Products - 804.1 Organic Compounds - 802.2 Chemical Reactions - 801 Chemistry - 711 Electromagnetic Waves - 618.1 Compressors - 605 Small Tools and Hardware - 603.1 Machine Tools, General - 601.3 Mechanisms
DOI:10.3969/j.issn.1002-6819.2012.11.040
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 13>

Accession number:20124215567588
Title:Three-dimensional beamforming performance of spherical microphones array
Authors:Chu, Zhigang (1); Yang, Yang (2)
Author affiliation:(1) The State Key Laboratory of Mechanical Transmission, College of Mechanical Engineering, Chongqing University, Chongqing 400044, China; (2) Automotive College of Tongji University, Shanghai 201804, China
Corresponding author:Chu, Z.(zgchu@cqu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:80-85
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to analyze the effect of spherical array structure parameters on the three-dimensional beamforming noise source identification performance, based on the Delay-and-Sum beamforming theory, the mainlobe width and the maximum sidelobe level were simulated and analyzed using varied diameters. Results indicated that the larger the diameter, the better the spatial resolution became. However, a larger diameter caused a weaker sibelobe inhibitory ability. Furthermore, the radial profile of array pattern and the maximum sidelobe level for five typical spherical arrays were studied. Results showed that the uniformly distributed microphones array had the best performance. When the wavenumber was 50-100 rad/m, the maximum sidelobe was about -12 dB, and when the wavenumber was up to 220 rad/m, the maximum sidelobe was still less than -6 dB. Therefore, increasing the uniformity and density of the microphones distribution can significantly improve the beamforming performance.
Number of references:30
Main heading:Beamforming
Controlled terms:Acoustic arrays - Acoustic imaging - Directional patterns (antenna) - Microphones - Three dimensional
Uncontrolled terms:Array patterns - Delay and sums - Mainlobe width - Microphones array - Noise source identification - Performance analysis - Radial profiles - Side lobes - Sidelobe levels - Spatial resolution  - Spherical array - Wave numbers
Classification code:902.1 Engineering Graphics - 752.1 Acoustic Devices - 746 Imaging Techniques - 732 Control Devices - 731 Automatic Control Principles and Applications - 716 Telecommunication; Radar, Radio and Television - 713 Electronic Circuits
DOI:10.3969/j.issn.1002-6819.2012.11.014
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 14>

Accession number:20124215567619
Title:Effect of power supply frequency on electrode adhesion during soybean milk continuous ohmic heating
Authors:Wang, Ranran (1); Wang, Tao (1); Zhu, Min (1); Zhang, Shifu (1); Ren, Jie (1); Li, Fade (2)
Author affiliation:(1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai'an, 271018, China; (2) Shandong Provincial Key Laboratory of Horticultural Machineries and Equipments, Tai'an, 271018, China
Corresponding author:Li, F.(li_fade@yahoo.com.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:287-291
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to solve the problem of electrode pollution, the effect of power supply frequency on electrode pollution during continuous ohmic heating of soybean milk was investigated. The experiments showed that the high frequency (&gt;1 000 Hz) alternative power supply can effectively reduce the pollution of the electrode as compared to 100 Hz AC frequency. This research can provide a theoretical reference for ohmic heating application in soybean milk processing, as well as other research on ohmic heating electrode pollution of protein-rich liquid food.
Number of references:24
Main heading:Pollution
Controlled terms:Electrodes - Fouling - Heating - Joule heating - Oilseeds
Uncontrolled terms:Heating applications - High frequency - Liquid food - Milk processing - Power frequency - Power supply - Power supply frequency - Soybean milk
Classification code:454.2 Environmental Impact and Protection - 539.1 Metals Corrosion - 643.1 Space Heating - 701.1 Electricity: Basic Concepts and Phenomena - 704.1 Electric Components - 821.4 Agricultural Products
DOI:10.3969/j.issn.1002-6819.2012.11.046
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 15>

Accession number:20124215567585
Title:Design and experiment of carbon fiber reinforced cement based composite material heating equipment for bulk curing barn
Authors:Zeng, Zhong (1); Wang, Yaofu (2); Xiao, Chunsheng (1); Deng, Xuefeng (1); Jiang, Duzhong (1); Li, Yueping (1)
Author affiliation:(1) South Central Agricultural Experimental Station of China Tobacco, Changsha 410007, China; (2) Technology Center of China Tobacco Hunan Industrial Co. Ltd., Changsha 410007, China
Corresponding author:Wang, Y.(yaofuwang@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:61-67
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to optimize the structural and performance of heating equipments of bulk curing barn, carbon fiber reinforced cement based composite (CFRC) material and recirculating zone staged igniting combustion technology were adopted to design new material heating equipments, which includes a tunnel type stove with disposable feeding coal and a radiator on the structured of 12 diameter 190 mm heating tubes arranged in 4-4-4 three layers of rank. By testing the thermal performance and corrosion resistance, the results indicated that the thermal conductivity of new material stove and radiator were 1.5 and 3.2 times of the common refractory devices respectively, and the overall thermal efficiency of new material heating equipments was increased by 4.5%. Therefore, the heating performance and service life of heating equipments for bulk curing barn were improved significantly. The corrosion resistance of new material heating tube was 5.3 times of the metal (NS steel) tube. The results of tobacco curing experiments showed that the heating and temperature stable performance of the new material heating equipments bulk curing barn were better than that of refractory and metal devices barn. Compared with the bulk barn of refractory and metal equipments, the ratios of superior leaves cured in the barn of new material equipments were increased by 2.6% and 2.3%, and the coal consumption reduced by 8.5% and 13.2% respectively. The effect of energy saving for tobacco curing is significant.
Number of references:30
Main heading:Curing
Controlled terms:Coal combustion - Corrosion resistance - Design - Equipment - Experiments - Heating - Heating equipment - Radiators - Refractory materials - Refractory metals  - Thermal conductivity - Tubes (components)
Uncontrolled terms:Bulk curing barn - Carbon fiber reinforced cement - Coal consumption - Combustion technology - Heating performance - Heating tubes - Metal devices - Temperature stable - Thermal efficiency - Thermal Performance  - Three-layer
Classification code:901 Engineering Profession - 815.1 Polymeric Materials - 812.2 Refractories - 643.1 Space Heating - 642.2 Industrial Furnaces and Components - 901.3 Engineering Research - 641.2 Heat Transfer - 539.1 Metals Corrosion - 524 Solid Fuels - 521 Fuel Combustion and Flame Research - 408 Structural Design - 616.1 Heat Exchange Equipment and Components
DOI:10.3969/j.issn.1002-6819.2012.11.011
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 16>

Accession number:20124215567597
Title:Forecast of citrus leaves frozen injury based on spectral signature
Authors:Tang, Zili (1); Yang, Yong (2); Hu, Weiguo (2); Zhou, Heng (2); Hu, Chungen (1)
Author affiliation:(1) College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (2) College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Corresponding author:Yang, Y.(yangyong@mail.hzau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:146-151
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Electrical conductivity is an important physiological and biochemical index which reflects the situation of plant biomembrane system and also reflects the nutrient condition of trees. The nutrition of the tree before winter is an important factor which resists extreme low temperature for surviving through the winter, the exudation or degradation of cell sap is an index of freezing degree when freezing injury happened. The research was to scan the different leaves in different freezing levels with a spectrometer, and the stepwise regression method was used to analyze the relation between spectral reflectivity and leaf conductivity, and then constructing the leaf conductivity and spectral reflection model. The results showed that there was a close relationship between citrus leaf electrical conductivity and spectral reflectance, the errors of predicted values by the two models were both less than 10% compared to measured values, which proved the two models had good predicted accuracy. The results can provide a reference for remote sensing to monitor the growth status and cold injury situation of orchards.
Number of references:26
Main heading:Plants (botany)
Controlled terms:Electric conductivity - Forestry - Freezing - Reflection - Remote sensing - Spectrum analysis
Uncontrolled terms:Biochemical indices - Biomembranes - Cell sap - Citrus - Citrus leaves - Cold injury - Electrical conductivity - Freezing injury - Freezing levels - Frozen injury  - Low temperatures - Nutrient conditions - Spectral reflectances - Spectral reflection - Spectral reflectivity - Spectral signature - Stepwise regression method
Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 921 Mathematics - 822.2 Food Processing Operations - 821.0 Woodlands and Forestry - 731.1 Control Systems - 711 Electromagnetic Waves - 701.1 Electricity: Basic Concepts and Phenomena - 461.9 Biology
DOI:10.3969/j.issn.1002-6819.2012.11.024
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 17>

Accession number:20124215567589
Title:Step-by-step CFD design method of pressure compensating emitter
Authors:Wang, Lipeng (1); Wei, Zhengying (1); Deng, Tao (1); Tang, Yiping (1)
Author affiliation:(1) State Key Laboratory of Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Corresponding author:Wei, Z.(zywei@mail.xjtu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:86-92
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to improve the design and development efficiency of the pressure compensating drip irrigation emitter, a step-by-step computational fluid dynamics (CFD) design method combined with finite element technology was proposed in the paper. The emitter flow rate was predicted by the step-by-step CFD method and the designed pressure-flow (P-Q) curve of the emitter was obtained. The test samples of pressure compensating emitter were manufactured by means of rapid prototype and manufacturing technology, the hydraulic performance experiment of the emitter was carried out and the experimental P-Q curve was obtained consequently. The results showed that the predicted values were coincident with the experimental results well within normal range of the emitter's working pressures, which verified the step-by-step CFD design method. On this basis, the influence of the emitter structure on its pressure compensating performance was studied, which showed that the height of pressure compensating chamber had significant effect on the emitter pressure compensating performance, based on that the series of pressure compensating emitter could be designed by changing the chamber height. This research can provide a reference for design and development of pressure compensating drip emitter.
Number of references:20
Main heading:Computational fluid dynamics
Controlled terms:Automobile manufacture - Design - Experiments - Irrigation - Pressure
Uncontrolled terms:CFD method - Design and Development - Design method - Drip emitter - Drip irrigation - Emitter flow rate - Emitter structures - Finite element technology - Hydraulic performance - Manufacturing technologies  - Pressure compensating - Pressure-flow curve - Rapid prototype - Test samples - Working pressures
Classification code:408 Structural Design - 662.1 Automobiles - 821.3 Agricultural Methods - 901.3 Engineering Research - 931.1 Mechanics
DOI:10.3969/j.issn.1002-6819.2012.11.015
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 18>

Accession number:20124215567610
Title:Method for road planning in farmland consolidation based on landscape pattern
Authors:He, Hao (1); Shi, Xueyi (2)
Author affiliation:(1) Changshou Land Survey and Plan Institute, Chongqing 401220, China; (2) College of Land Science and Technology, China University of Geosciences, Beijing 100083, China
Corresponding author:He, H.(hehao8@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:232-236
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The exploration on method for road planning in farmland consolidation was made by combining road planning in farmland consolidation with the landscape. The landscape pattern corridor indices were used to establish the standards of road planning in farmland consolidation and ArcGIS was used as a tool to plan road in farmland consolidation project. It was found that the construction of the standards with landscape pattern corridor indices can elaborate the target in improvement of landscape pattern in project area and guide the road planning from landscape pattern aspect. It can also contribute to the improvement upon landscape function and structure and the promotion of the stability of land ecosystem in project area.
Number of references:17
Main heading:Farms
Controlled terms:Geographic information systems - Highway planning - Land use - Planning
Uncontrolled terms:ArcGIS - Consolidation projects - Landscape pattern - Road planning
Classification code:403 Urban and Regional Planning and Development - 406.1 Highway Systems - 723.3 Database Systems - 821 Agricultural Equipment and Methods; Vegetation and Pest Control
DOI:10.3969/j.issn.1002-6819.2012.11.037
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 19>

Accession number:20124215567601
Title:Calculation method for winding inductance of reluctance rotor brushless double-fed generator
Authors:Gong, Sheng (1); Yang, Xiangyu (1); Ji, Liangzhou (1)
Author affiliation:(1) School of Electric Power, South China University of Technology, Guangzhou 510640, China
Corresponding author:Yang, X.(yangxyu@scut.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:170-176
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:According to the problems that the reluctance parameters calculated by traditional calculation methods can not be used directly in the design of brushless double-fed generators, a revised winding function method was put forward based on traditional inductance calculation and winding function method. It aims to calculate the power of a brushless double-fed reluctance generator with complex winding structure and the self-inductance and mutual inductance of its two sets of controlled windings. A prototype was then designed and built up by using the method and its rationality was verified through generating operation experiment. The research was expected to provide a reference for design, calculation and prototype production of similar type of machine.
Number of references:30
Main heading:Rotors (windings)
Controlled terms:Algorithms - Gas generators - Inductance - Winding
Uncontrolled terms:Double fed - Inductance calculation - Mutual inductance - Reluctance generators - Winding function - Winding inductance - Winding structure
Classification code:522 Gas Fuels - 701.1 Electricity: Basic Concepts and Phenomena - 704.1 Electric Components - 723 Computer Software, Data Handling and Applications - 816.1 Processing of Plastics and Other Polymers - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.11.028
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 20>

Accession number:20124215567600
Title:Analyzing scale effects of crop LAI based on PCA method
Authors:Dong, Yingying (1); Wang, Jihua (1); Li, Cunjun (1); Yang, Guijun (1); Xu, Xin'gang (1); Wang, Huifang (1); Huang, Wenjiang (1)
Author affiliation:(1) Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China; (2) Institute of Agricultural Remote Sensing and Information Technology, Zhejiang University, Hangzhou 310029, China
Corresponding author:Li, C.(licj@nercita.org.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:164-169
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to quantitatively analyze the scale effects of leaf area index (LAI) of crop canopies, an analyzing method based on principal component analysis (PCA) theory was proposed in this paper. In this method, PCA theory was introduced for data mining and reorganization, which fully considered the correlation and variability of multi-resolution data. Dynamical multiple linear regression theory was selected for LAI estimation by taking principal components (PCs) as independent variables. Barley and corn were chosen as experimental objects. Firstly, observed data at different spatial scales were constructed by polymerization method based on the small scale observed data. Secondly, the scale effects analyzing method proposed in this work was used for data processing and LAI estimation. Finally, the number of effective principle components (NEPCs), coefficient of determination (R²), and mean relative accuracy (MRA) were selected as testing indicators to analyze the above results to quantitatively describe scale effects of crop LAI. The theory analyses and numerical practices verified the feasibility and validity of this proposed method in analyzing scale effects of crop LAI.
Number of references:23
Main heading:Numerical methods
Controlled terms:Crops - Data processing - Linear regression - Principal component analysis
Uncontrolled terms:Coefficient of determination - Crop canopy - Independent variables - Leaf Area Index - Multiple linear regressions - Multiresolution data - Observed data - PCA method - Polymerization method - Principal Components  - Principle component - Relative accuracy - Scale effects - Small scale - Spatial scale - Spatial scaling - Statistic analysis
Classification code:723.2 Data Processing and Image Processing - 821.4 Agricultural Products - 921.6 Numerical Methods - 922.2 Mathematical Statistics
DOI:10.3969/j.issn.1002-6819.2012.11.027
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 21>

Accession number:20124215567609
Title:Harmonic analysis of valley distribution in typical areas of Loess Plateau
Authors:Bu, Nan (1); Zhu, Qingke (1); An, Yanchuan (1); Zhang, Yan (1); Zhang, Qing (2); Qin, Wei (1)
Author affiliation:(1) Key Laboratory of Soil and Water Conservation and Desertification Combating of Ministry of Education, Beijing Forestry University, Beijing 100083, China; (2) College of Basic Sciences and Information Engineering, Beijing Forestry University, Beijing 100083, China
Corresponding author:Zhu, Q.(xiangmb@bjfu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:225-231
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to study the topographic periodicity of the Loess Plateau, and to explore the distribution law of tributary valleys, so as to explore a new method for assessment of the Loess Plateau soil erosion, the paper briefly describes basic principles of harmonic analysis and periodgram analysis. Taking Xifeng in Gansu, Jixian in Shanxi, Ansai in Shaanxi, Guyuan in Ningxia as study areas, the valley distribution in the Loess Plateau was studied based on harmonic analysis and periodgram analysis. The results indicated that in the Loess Plateau regions of different types, the period of main channel differed significantly. Generally speaking, the period of the gully region of loess plateau was greater than the transitional region, and the period of the transitional region was greater than the hill and gully area of Loess Plateau; The period of branch gully in the Loess Plateau mainly ranged from 400 to 800 m, which accounted for 97.5% of the overall periods. Based on t-test of the period of branch gully in four different research areas, the results showed that the mean periods of Xifeng, Jixian and Ansai had no significant difference (P&gt;0.05), while in the two side test, all the probability of mean period of branch gully in Guyuan, Xifeng, Jixian and Ansai was less than 0.01 (P&lt;0.01), so it can be considered that the difference was extremely significant. On analyzing the average terrain slope greater than 5&deg; in the regions of different types, it was found that Xifeng in Gansu is steeper than Jixian in Shanxi, and Jixian in Shanxi is steeper than Ansai in Shaanxi, which is steeper than Guyuan in Ningxia. It was also found that the average period of branch gully decreased continuously with the increasing of the average slope. Therefore, it can be concluded that the average terrain slope can directly affect the formation of branch gully in the Loess Plateau.
Number of references:27
Main heading:Landforms
Controlled terms:Erosion - Geomorphology - Harmonic analysis
Uncontrolled terms:Average period - Basic principles - Digital elevation model - Distribution law - Loess Plateau - Mean period - Periodgram analysis - Slope-gully system - Soil erosion - Study areas  - Terrain slope
Classification code:407 Maritime and Port Structures; Rivers and Other Waterways - 481.1 Geology - 481.1.1 Geomorphology - 483 Soil Mechanics and Foundations - 921.6 Numerical Methods
DOI:10.3969/j.issn.1002-6819.2012.11.036
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 22>

Accession number:20124215567591
Title:Characteristics and simulation of ammonia volatilization from paddy fields under different water and nitrogen management
Authors:Yang, Shihong (1); Peng, Shizhang (1); Xu, Junzeng (1); Yao, Junqi (3); Jin, Xiaoping (4); Song, Jing (4)
Author affiliation:(1) State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China; (2) College of Environment, Hohai University, Nanjing, 210098, China; (3) Development Center for Science and Technology of Rural Water Resources of Jiangsu, Nanjing 210029, China; (4) Kunshan Water Conservancy Technique and Expansion Station, Kunshan 215300, China
Corresponding author:Peng, S.(szpeng@hhu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:99-104
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to investigate the reasonable water and nitrogen management for reducing ammonia volatilization from paddy field, the effects of ammonia volatilization from paddy field under different water and nitrogen managements were analyzed based on field experiments. In addition, ammonia volatilization from paddy fields with different nitrogen managements under controlled irrigation was simulated. The results showed that joint application of controlled irrigation and site-specific nitrogen managements not only substantially reduced the peak values of ammonia volatilization from paddy fields, but also lowered the ammonia volatilization in the most time of rice growing stage without nitrogen fertilizer input. Nitrogen loss through ammonia volatilization from paddy fields with the joint application of controlled irrigation and site-specific nitrogen management was 39.63 kg/hm², decreased by 44.69% compared to traditional water and nitrogen management. The processes of ammonia volatilization with different nitrogen managements under controlled irrigation can basically captured by DNDC model. The errors of simulated values and measured values of ammonia volatilization during rice growing stage were less than &plusmn;10%. Joint application of controlled irrigation and site-specific nitrogen management significantly reduced nitrogen loss through ammonia volatilization from paddy field. And the contribution of site-specific nitrogen management to the reduction of ammonia volatilization from paddy fields was larger than controlled irrigation. The study results can provide a basis for scientific management of water and nitrogen and reduction of ammonia volatilization from paddy fields.
Number of references:31
Main heading:Ammonia
Controlled terms:Agricultural runoff - Irrigation - Management - Models - Nitrogen - Nitrogen fertilizers - Reduction - Water management
Uncontrolled terms:Ammonia volatilization - Field experiment - Nitrogen loss - Nitrogen management - Paddy fields - Peak values - Reduced nitrogen - Scientific management - Site-specific
Classification code:912.2 Management - 902.1 Engineering Graphics - 821.5 Agricultural Wastes - 821.3 Agricultural Methods - 804.2 Inorganic Compounds - 804 Chemical Products Generally - 802.2 Chemical Reactions - 446 Waterworks - 444 Water Resources
DOI:10.3969/j.issn.1002-6819.2012.11.017
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 23>

Accession number:20124215567583
Title:Experimental study of ethanol supply mode on exhaust emissions of high-speed diesel engine
Authors:Luo, Kuo (1); Luo, Xia (1); Li, Zhiwei (1)
Author affiliation:(1) College of Engineering, South China Agriculture University, Guangzhou 510642, China
Corresponding author:Luo, K.(luokuo@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:50-53
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To study the effect of ethanol supply mode on exhaust emissions of high-speed diesel engine, an experimental study of the ethanol supply mode was investigated in a high-speed, small swirl chamber diesel. The contrast experiment was used to compare the discharge index among supplying ethanol alone, ethanol-blended fuel diesel, and diesel alone through inlet. Compared with the ethanol-blended fuel diesel, the soot emissions of supplying ethanol alone reduce 16% and CO emissions decrease 10%, while NOx and HC emissions increase. The soot emissions of ethanol supplying alone and ethanol-blended fuel diesel is much lower than supplying diesel alone. The supply mode of ethanol is an important element which affects the properties of high-speed diesel engines. The supply of ethanol through inlet can substantially reduce the emissions of soot and CO.
Number of references:25
Main heading:Diesel engines
Controlled terms:Ethanol - Experiments - Neutron emission - Soot
Uncontrolled terms:CO emissions - Contrast experiment - Contrast test - Ethanol-blended fuels - Exhaust emission - Experimental studies - HC emissions - High-speed - High-speed diesel engines - Soot emissions  - Supply mode - Swirl chambers
Classification code:521 Fuel Combustion and Flame Research - 523 Liquid Fuels - 612.2 Diesel Engines - 804 Chemical Products Generally - 901.3 Engineering Research - 932.1 High Energy Physics
DOI:10.3969/j.issn.1002-6819.2012.11.009
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 24>

Accession number:20124215567605
Title:CO<inf>2</inf> removal from biogas by using membrane absorption technology
Authors:Yan, Shuiping (1); Chen, Jing'ao (1); Ai, Ping (1); Wang, Yuanyuan (1); Zhang, Yanlin (1)
Author affiliation:(1) College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Corresponding author:Yan, S.(yanshp@mail.hzau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:196-204
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to integrate the unique advantages of chemical absorption technology and membrane separation technology used to capture CO<inf>2</inf> from biogas, membrane CO<inf>2</inf> absorption technology was put forward in this study. Based on the CH<inf>4</inf> volume fraction in the treated gas, CO<inf>2</inf> mass transfer rate of absorption and energy consumption factor, CO<inf>2</inf> removal performances from the simulated biogas by monoethanolamine (MEA), diethanolamine (DEA) and triethanolamine (TEA) were experimented by using hydrophobic polypropylene hollow fiber membrane contactor as CO<inf>2</inf> absorber. Results showed that CO<inf>2</inf> can be successfully captured from biogas by using membrane CO<inf>2</inf> absorption technology. And when MEA was selected to act as CO<inf>2</inf> absorbent and biogas flow rate was 120 L/h, CH<inf>4</inf> volume fraction can be increased from 60% to up to 97.8%. But CO<inf>2</inf> mass transfer rate of absorption can reach the maximum, approximate 18.03 mol/(m²&middoth) by adopting 300 L/h biogas flow rate. In addition, CO<inf>2</inf> removal performance of these three absorbents can be ranked as: MEA&amp;gt;DEA&amp;gt;TEA. The operating conditions were also optimized on the basis of the calculation of regeneration energy consumption factor, where 0.175-0.2 mol/mol lean CO<inf>2</inf> loading should be recommended for MEA, and 16.7 L/L gas-liquid ratio may be suitable for DEA. Finally, an economic analysis of CO<inf>2</inf> removal from biogas by using membrane absorption process was also put forward in this study. The results showed that the cost of CO<inf>2</inf> captured is relatively lower, and when the biogas production increases from 1000 to 12000 m³/d, CO<inf>2</inf> removal cost can be reduced by about 78.6% to 0.5 Yuan/m³ of biogas. The results can provide references for selection of biogas upgrading technology with high efficiency.
Number of references:33
Main heading:Biogas
Uncontrolled terms:Absorbent - Absorption process - Biogas flow rate - Biogas production - Chemical absorption - Diethanolamine - Economic analysis - Gas-liquid ratio - Hollow fiber membranes - Mass transfer rate  - Membrane separation technology - Monoethanolamine - Operating condition - Polypropylene hollow fiber membrane - Purification - Regeneration energy - Triethanolamines - Upgrading technologies
Classification code:522 Gas Fuels
DOI:10.3969/j.issn.1002-6819.2012.11.032
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 25>

Accession number:20124215567584
Title:Combustion noise and its fluctuation of diesel engine fueled with jatropha curcas oil at idle condition
Authors:Liang, Yu (1); Zhou, Liying (1); Wang, Ziyu (2); Cheng, Xiuwei (2)
Author affiliation:(1) Department of Mechanism and Electronic Engineering, Guiyang University, Guiyang 550005, China; (2) China North Engine Research Institute, Datong 037036, China
Corresponding author:Liang, Y.(liangyumu@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:54-60
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to analyze the combustion noise and the fluctuation of multi-cycle combustion noise at idle condition of the diesel engine using curcas oil, the multi-cycle cylinder pressure at idle condition fueled with diesel, diesel-curcas mix oil, curcas oil and heated curcas oil were collected from a water-cooled four-stroke single cylinder diesel engine. The combustion noise and fluctuation of combustion noise were analyzed by maximum combustion pressure, pressure rising rate, pressure rising acceleration, cylinder pressure spectrum and A sound pressure level. The cylinder pressure spectrum burning diesel was similar to burning diesel-curcas mix oil, and burning curcas oil was similar to burning heated curcas oil. The cylinder pressure was high burning diesel and burning diesel-curcas mix oil. The combustion noise increased with increasing maximum pressure rising rate and with delaying corresponding phase of maximum pressure rising rate at the same condition. The A sound pressure level burning heated curcas oil was about 7 dB lower than burning diesel with 18&deg;CA fuel supply advance angle, and was about 5 dB lower than burning diesel with 21&deg;CA fuel supply advance angle. The fluctuation of the A sound pressure level decreased with the decreasing in cycle variation rate of the maximum combustion pressure rising rate.
Number of references:30
Main heading:Diesel engines
Controlled terms:Acoustic variables measurement - Acoustic wave transmission - Combustion - Cylinders (shapes) - Noise pollution
Uncontrolled terms:Combustion pressure - Curcas oil - Cylinder pressures - Fluctuation - Fuel supply advance angle - Idle condition - Jatropha curcas - Maximum pressure - Multi-cycle - Rising rate  - Single-cylinder diesel engine - Sound pressure level
Classification code:408.2 Structural Members and Shapes - 461.7 Health Care - 521.1 Fuel Combustion - 612.2 Diesel Engines - 751.1 Acoustic Waves - 941.2 Acoustic Variables Measurements
DOI:10.3969/j.issn.1002-6819.2012.11.010
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 26>

Accession number:20124215567593
Title:Impact of regulated deficit irrigation on growth and fruit yield of mature fragrant pear trees under trickle irrigation
Authors:Wu, Yang (1); Wang, Wei (2); Lei, Tingwu (1); Huang, Xingfa (1); Zhao, Zhi (1); Ma, Yingjie (4)
Author affiliation:(1) College of Hydraulic and Civil Engineering, China Agricultural University, Beijing 100083, China; (2) College of Engineering, China Agricultural University, Beijing 100083, China; (3) State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China; (4) College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China
Corresponding author:Wang, W.(Weiwang@cau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:118-124
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Regulated Deficit Irrigation (RDI) is known to have higher water use efficiency, and higher fruit yield with better quality. Field experiments were conducted during 2009 and 2010 in Korla city, Xinjiang autonomous region, to investigate the effects of RDI applied in different growth stages and with different levels of water deficit on vegetative, fruit growth and yield of mature fragrant pear trees of 24 years old. The experimental treatments involved moderate and severe water deficit, in either the cell division period or in the slow fruit growth period or in both periods. Trickle irrigation, with 2 driplines, one on each side of the trees was adopted. The moderate RDI used 60% and the severe used 40% replacement of US Class A pan evaporation, respectively. Irrigation amount during non-deficit stages was the same as in the control treatment. The control treatment was irrigated at 80% of pan evaporation during the whole growth season and all treatments were irrigated weekly. The results showed that the water deficit applied during both cell division and/or slow fruit enlargement stage inhibited the vegetative growth. Compared with the control, the summer pruning of the RDI treatments was reduced by 8.4%-43.2%. In both years, as compared with the control, the severe water deficit irrigation during cell division stage significantly increased yield by 15.5%-19.2%, and reduced the irrigation water by 9.7%-8.1%. The yield of moderated water deficit irrigation in slow fruit enlargement stage was increased by 14.0%-18.0%, and the irrigation water was reduced by 13.2%-11.3%. The yield of severe water deficit irrigation during both cell division and slow fruit enlargement stages was decreased by 15.4%-13.2%, and the irrigation water reduced by 34.7%-28.4%. Fruit quality had no significant differences among the treatments. The results are meaningful to guide the irrigation management of mature Korla fragrant pear trees.
Number of references:25
Main heading:Fruits
Controlled terms:Cell proliferation - Evaporation - Forestry - Irrigation - Phase transitions - Quality control - Soil moisture - Water resources - Water supply
Uncontrolled terms:Cell divisions - Class-A pan - Field experiment - Fruit growth - Fruit quality - Fruit yield - Growth season - Growth stages - Irrigation management - Irrigation waters  - Pan evaporation - Regulated deficit - Regulated deficit irrigation - Trickle irrigation - Vegetative growth - Water deficits - Water use efficiency - Xinjiang
Classification code:821 Agricultural Equipment and Methods; Vegetation and Pest Control - 802.3 Chemical Operations - 801.4 Physical Chemistry - 913.3 Quality Assurance and Control - 483.1 Soils and Soil Mechanics - 446.1 Water Supply Systems - 444 Water Resources - 461.9 Biology
DOI:10.3969/j.issn.1002-6819.2012.11.020
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 27>

Accession number:20124215567582
Title:Power prediction for centrifugal pumps at shut off condition based on BP neural network
Authors:Liu, Houlin (1); Wu, Xianfang (1); Wang, Yong (1); Tan, Minggao (1); Wang, Kai (1)
Author affiliation:(1) Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Wu, X.(demonwt@sohu.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:45-49
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:At present, the power of centrifugal pumps at shut off condition can not be obtained by theory computation. The structure of the BP artificial neural network and its application situation in energy performance prediction of centrifugal pumps were introduced in detail. Based on BP artificial neural network, the characteristic prediction model is established to predict power of centrifugal pumps at shut off condition. The input mode of the BP network prediction model is presented and the number of middle layer is fixed by many tests. The characteristic data of 46 centrifugal pumps at shut off condition are used to train the network model, and the data of the other 3 centrifugal pumps are used to test the network model. The weight of each layer is also presented. The study fruits show that the prediction results of the model agree well with the experiment results. The average prediction discrepancy of the network is 4 percent, the minimum prediction discrepancy is 3.35 percent, and the maximal prediction discrepancy is 4.51 percent. The prediction precision of the BP network model can meet the engineering practical requirement.
Number of references:25
Main heading:Centrifugal pumps
Controlled terms:Backpropagation - Computation theory - Forecasting - Mathematical models - Neural networks - Precision engineering
Uncontrolled terms:BP artificial neural network - BP networks - BP neural networks - Energy performance - Input modes - Middle layer - Network models - Power - Power predictions - Prediction model  - Prediction precision - Shut off condition - Theory computation
Classification code:618.2 Pumps - 723.4 Artificial Intelligence - 761 Nanotechnology - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.11.008
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 28>

Accession number:20124215567595
Title:Landform distribution features of soil erosion in Ningqiang county
Authors:Wang, Xing (1); Li, Zhanbin (1); Li, Peng (1); Gao, Haidong (1)
Author affiliation:(1) College of Water Resources and Hydraulic Power, Xi'an University of Technology, Xi'an 710048, China; (2) Shaanxi Provincial Bureau of Soil and Water Conservation, Xi'an 710004, China
Corresponding author:Li, Z.(zbli@mail.xaut.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:132-137
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to reveal the spatial distribution features of soil erosion in Ningqiang county, the GIS technology was used to obtain the landform features in the respects of slope degree, slope direction, elevation and rolling degree of soil erosion distribution via overlap of the distribution map of soil erosion intensity in Ningqiang county and the landform element maps extracted from the digital elevation model. The results showed that the degree of soil erosion and water loss in Ningqiang county was 63.79%. The soil erosion intensity was mainly moderate. The distributions of soil erosion area percentage, soil erosion comprehensive index and soil erosion intensity at different slope degree, elevation and rolling degree were assumed as single peak. The soil erosion area percentage of flatland was close to 0. The distributions of soil erosion area percentage, soil erosion comprehensive index and soil erosion intensity at different slope directions were not different dramatically. The maximum and main range of different soil erosion intensity distribution were increased with rise of slope degree, but decreased with rise of elevation. The distributions of soil erosion intensity in different rolling degrees were similar. The results can provide a basis for decision making and theory support for making regional plan of soil and water conservation and treatment of soil erosion and water loss.
Number of references:22
Main heading:Soils
Controlled terms:Erosion - Geographic information systems - Landforms - Regional planning - Water conservation
Uncontrolled terms:Different slopes - Digital elevation model - Distribution feature - GIS technology - Regional plans - Single peak - Soil and water conservation - Soil erosion - Water loss
Classification code:723.3 Database Systems - 483.1 Soils and Soil Mechanics - 483 Soil Mechanics and Foundations - 481.1 Geology - 444 Water Resources - 407 Maritime and Port Structures; Rivers and Other Waterways - 403.2 Regional Planning and Development
DOI:10.3969/j.issn.1002-6819.2012.11.022
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 29>

Accession number:20124215567586
Title:Influence of shoe tooth height of tracked vehicle on traction performance and its parameter determination
Authors:Xu, Yan (1); Wu, Hongyun (2); Zuo, Libiao (3)
Author affiliation:(1) Department of Mechanical and Electrical Engineering, Changsha University, Changsha 410003, China; (2) College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; (3) Department of Ocean Mining, Changsha Institute of Mining Research Limited Liability Company, Changsha 410012, China
Corresponding author:Wu, H.(hongyun_wu76@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:68-74
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to analysis the influence of height of seabed of track shoe tracked vehicle on traction performance, the shearing strength-shearing displacement model of deep-sea soft sediments were obtained by shearing testing of simulated sediments in testing pool, and then the traction force model of the sediments and the adesion force model of the tracked seabed vehicle were founded. The influence of the height of track shoe on the traction performance of the seabed tracked vehicle was researched by traction force model and adesion force model. According to the research, the traction performance of the vehicle increases with the height of the track shoe on deep-sea soft sediments, and the traction force of the vehicle on sediments increases quickly with the height of track shoe. The adesion force increases quickly when the height of track shoe is less than 15 cm and then increases slowly when it is more than 15 cm. The height of track shoe should be not more than 15 cm.
Number of references:25
Main heading:Traction (friction)
Controlled terms:Adhesion - Computer simulation - Construction equipment - Drives - Sedimentology - Sediments - Tracked vehicles
Uncontrolled terms:Displacement model - Force model - Parameter determination - Seabed vehicle - Soft sediments - Track shoes - Traction forces - Traction performance
Classification code:951 Materials Science - 801 Chemistry - 723.5 Computer Applications - 705 Electric Generators and Motors - 682.1.1 Railroad Cars - 663 Buses, Tractors and Trucks - 483 Soil Mechanics and Foundations - 481.1 Geology - 405.1 Construction Equipment
DOI:10.3969/j.issn.1002-6819.2012.11.012
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 30>

Accession number:20124215567577
Title:Design and experiment of self-propelled high-ground- clearance spreader for paddy variable-rate fertilization
Authors:Chen, Shufa (1); Zhang, Shiping (1); Sun, Xingzhao (2); Li, Yaoming (3)
Author affiliation:(1) School of Mechanical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China; (2) Lianyungang Yuantian Farm Machinery Research Institute, Lianyungang 222005, China; (3) Key Laboratory of Modern Agricultural Equipment and Technology, Min. of Edu. and Jiangsu Province, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Chen, S.(csf7012@yahoo.com.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:16-21
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to solve the problems of low ground clearance, backward manure regulation technology and low working efficiency present in paddy fertilizing machine, a self-propelled high-ground-clearance spreader was designed for paddy variable-rate fertilization, the whole structure and working mechanism of the machine were introduced, the special chassis with high ground clearance, the fertilization disc and regulation device for fertilizing orifice were designed, the structures and parameters of main components of the machine were given, the software and hardware integrated control system which mainly consists of AT89C51 single-chip microcomputer (SCM) was designed, The fertilizing experiments in grounds and paddy fields showed that the angle for pushing fertilizer board was at -20&deg;-40&deg;, the minimum turning radius of the machine was less than 1.8 m, the height of fertilization disc from the ground was 1100 mm, the fertilizing width of machine achieved 14 m, working efficiency was up to 6 hm²/h, the experimental results indicate that the machine is suitable for self-propelled walking in paddy fields, and the design for the machine and its control system meets variable-rate fertilization requirements of widespread distribution and high efficiency in paddy fields.
Number of references:27
Main heading:Machine components
Controlled terms:Agricultural machinery - Chassis - Control systems - Design - Efficiency - Experiments - Manures - Orifices - Spreaders
Uncontrolled terms:Ground clearance - Paddy fields - SCM - Single chip microcomputers - Turning radius - Variable rate - Working efficiency - Working mechanisms
Classification code:913.1 Production Engineering - 901.3 Engineering Research - 821.5 Agricultural Wastes - 821.1 Agricultural Machinery and Equipment - 731.1 Control Systems - 663.2 Heavy Duty Motor Vehicle Components - 619.1 Pipe, Piping and Pipelines - 601.2 Machine Components - 408 Structural Design
DOI:10.3969/j.issn.1002-6819.2012.11.003
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 31>

Accession number:20124215567576
Title:Spatial and temporal changes in grain production before and after implementation of Grain for Green project in Loess Plateau region
Authors:Liu, Zhong (1); Li, Baoguo (1)
Author affiliation:(1) Key Laboratory of Arable Land Conservation (North China) of Ministry of Agriculture, College of Resource and Environment China Agriculture University, Beijing 100193, China
Corresponding author:Liu, Z.(lzh@cau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:1-8
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Grain for Green Project began in 1999 is a major ecological projects implemented by the Chinese government for the ecologically fragile areas of the Western China. Implementation of the project on local grain production and the resulting policy effect is a problem worthy of study. This paper analyzed temporal and spatial variation of grain production in the eco-fragile area of the Loess Plateau of China before and after the implementation of the Grain for Green Project using county-level statistics in 1996, 2003 and 2007. The results showed that from 1996 to 2003, the sown area of grain of the study area declined sharply, and then began to rise gradually. Downward trends of grain sown area had been checked for most counties until 2007. From 1996 to 2007, the study area's total grain output declined, but the level of grain yield per unit area increased. The grain yield per unit area of the study area was far lower than the national average, while per capita grain production in the study area was slightly lower than the national average, but both showed great inter-annual fluctuations. The lower the level of grain production, the greater the inter-annual fluctuations could be observed. Unstable grain production will strengthen the farmers' motivation, which goes against the consolidation of the results of Grain fro Green. Grain for Green project should be implemented step by step according to the local condition with an appropriate scale in study area. Further more, the livelihood of farmers should be conducted and protected in terms of policy to consolidate the project effects.
Number of references:20
Main heading:Grain (agricultural product)
Controlled terms:Agriculture - Ecology - Production
Uncontrolled terms:Chinese Government - Ecological project - Grain production - Grain yield - Interannual - Local conditions - Loess Plateau - Per capita - Per unit - Study areas  - Temporal and spatial variation - Temporal change - Western China
Classification code:454.3 Ecology and Ecosystems - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.4 Agricultural Products - 913.2 Production Control
DOI:10.3969/j.issn.1002-6819.2012.11.001
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 32>

Accession number:20124215567596
Title:Characteristics of aeolian sediment under different underlying surfaces in oasis-desert transitional region of Minqin
Authors:Wang, Ping (1); Wang, Yan (1)
Author affiliation:(1) Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, China; (2) College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Corresponding author:Wang, P.(wping@lzu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:138-145
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Based on the practical observation materials of three sand storms in Minqin county, the characteristics of aeolian sediment under different underlying surfaces in the oasis-desert transitional region of this area were studied. The sand storms were occurred on April 19, 22-23 and 30 in 2009. The results showed that the upper segment of the sediment discharge line of the vertical distribution fit in with exponential rule, and the real sediment near the soil surface (beneath 35 cm) was larger than that of calculated with the exponential function. 90% sediment discharge of the sand surface was beneath 15 cm. 80% sediment discharge of soil surfaces with Nitraria bushes, straw checkerboard barrier and reed were in the height of 35 cm from the soil surface. The effects of underlying surface with different conditions on sediment particles diameter mainly focus on the near surface at 15 cm range from soil surface, and the effects on the particle size of aeolian sediment at 35 cm to 125 cm range mainly focus on the percentage of different particles. The straw checkerboard barrier is a best way for reducing the wind erosion, which can lower the sediment transport capacity of wind. The function of soil surface with Nitraria bushes takes the second place, and the soil surface with reeds is the third. The surface covered by sand has the biggest sediment discharge.
Number of references:21
Main heading:Surfaces
Controlled terms:Erosion - Landforms - Sand - Sediment transport - Sedimentology - Soils - Storms
Uncontrolled terms:Exponential rule - Near-surface - Oasis-desert transitional region - Sand storms - Sediment discharge - Sediment particle size - Sediment particles - Sediment transport capacity - Soil surfaces - Underlying surface  - Vertical distributions - Wind erosions
Classification code:951 Materials Science - 931 Classical Physics; Quantum Theory; Relativity - 483.1 Soils and Soil Mechanics - 483 Soil Mechanics and Foundations - 481.1 Geology - 443.3 Precipitation - 407 Maritime and Port Structures; Rivers and Other Waterways
DOI:10.3969/j.issn.1002-6819.2012.11.023
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 33>

Accession number:20124215567603
Title:Temperature and humidity monitoring system for young silkworm base on semiconductor refrigerating heat pump
Authors:Zhong, Jin'an (1)
Author affiliation:(1) College of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China
Corresponding author:Zhong, J.(zhongjinan_0@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:183-188
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:The traditional way to foster silkworm had many defects, such as inconvenient to use, easily lead to misoperation and probable to hazard silkworm by poison gas produced by coal stove. In the light of this situation, it was introduced to design a new temperature and humidity control system for common foster room based on LPC1111. The system used semiconductor refrigeration piece as a new cool and heat source which combined with moisture absorption characteristic of acrylic resin to realize simple dehumidification, and closed-loop control system by using temperature and humidity sensors was built. The design of temperature and humidity control and its specific hardware circuit and software process were introduced in the article. Test results showed that the maximum deviation of temperature was one degree Celsius, and the maximum deviation of humidity was six percent. Consequently, the live environmental requirements for young silkworm could be met by setting the temperature and humidity reasonably.
Number of references:26
Main heading:Humidity control
Controlled terms:Animals - Control systems - Environmental engineering - Monitoring - Refrigeration
Uncontrolled terms:Acrylic resins - DS18B20 - Embedded conroller - Environmental requirement - Heat pumps - Heat sources - Humidity monitoring - LPC1111 - Misoperation - Moisture absorption  - Software process - Specific hardware - Temperature and humidity control - Temperature and humidity sensor
Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 822 Food Technology - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 814 Leather and Tanning - 731.1 Control Systems - 644.4 Cryogenics - 471 Marine Science and Oceanography - 461 Bioengineering and Biology - 454 Environmental Engineering - 402 Buildings and Towers
DOI:10.3969/j.issn.1002-6819.2012.11.030
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 34>

Accession number:20124215569769
Title:Risk simplified assessment on phosphorus loss risk based on digital soil system at county scale
Authors:Zhang, Shiwen (1); Wang, Pengpeng (1); Ye, Huichun (1); Huang, Yuanfang (1); Mu, Enlin (3); Wang, Laibin (2); Chen, Xiaoyang (2); Xu, Guangquan (2)
Author affiliation:(1) Key Laboratory of Arable Land Conservation (North China), Ministry of Agriculture, China Agricultural University, Beijing 100094, China; (2) Anhui University of Science and Technology, Huainan 232001, China; (3) Comprehensive Development of Ministry of Water Resources, Beijing 100600, China
Corresponding author:Huang, Y.(yfhuang@china.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:110-117
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:County is the basic administrative unit in China. This paper explored a simplified method of soil phosphorus loss risk assessment at county scale in order to provide guidance for the county phosphorus risk assessment and production practices. Under considering the characteristics of the county scale, the paper simplified phosphorus index assessment method, and assessed phosphorus loss risk for Shunyi district based on digital soil system using GIS technology and pedometrics. The research results showed that the phosphorus loss in the study area presents higher level in the east and lower in the west, and zonal distribution along the rivers. The distribution pattern mainly was led by agricultural inputs. Risk of soil phosphorus loss was overall lower in the study area, but the moderate risk accounted for 30.05% of the total area. Phosphorus management should be strengthened and soil phosphorus loss should be prevented in the future. The simplified P index-based digital soil could reflect risk level of regional phosphorus loss, which can provide risk a reference for risk assessment for the county phosphorus loss.
Number of references:31
Main heading:Risk assessment
Controlled terms:Geographic information systems - Phosphors - Phosphorus - Soils
Uncontrolled terms:County scale - Distribution patterns - GIS technology - Phosphorus indices - Phosphorus loss - Phosphorus management - Production practice - Research results - Risk levels - Risk-based  - Shunyi District - Simplified assessment - Simplified method - Soil phosphorus - Soil systems - Study areas
Classification code:483.1 Soils and Soil Mechanics - 723.3 Database Systems - 804 Chemical Products Generally - 922.1 Probability Theory
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 35>

Accession number:20124215567587
Title:Integrated control system of vehicle body height and adjustable damping
Authors:Wang, Ruochen (1); Zhang, Xiaoliang (2); Chen, Long (2); Zhu, Xinghua (2)
Author affiliation:(1) Jiangsu Province Key Laboratory of Automotive Engineering, Zhenjiang 212013, China; (2) Institute of Automobile Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Wang, R.(wangruochen@ujs.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:75-79
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to improve vehicle performance, an 8-DOF complete vehicle mathematics model of coach was built and the theoretic analysis and calculating method for integrated control of vehicle body height and adjustable damping were presented to design the integrated control system of tunable damper and the electro-controlled air suspension of coach. On the basis of the simulation calculating, road test of actual vehicle was conducted, the effect of integrated controlled electro-controlled air suspension system was analyzed. The results of simulation calculating and experiment result were consistent. The good matching performance of the air suspension, which was integrated controlled by vehicle body height and tunable damper, and complete vehicle performance achieved, the comprehensive performance of coach was also improved. The study verified the effectiveness of the integrated control strategy and it laid a foundation for the ECAS.
Number of references:20
Main heading:Suspensions (components)
Controlled terms:Automobile suspensions - Control systems - Damping - Integrated control - Vehicle performance - Vehicles
Uncontrolled terms:Adjustable damper - Air suspension - Calculating methods - Comprehensive performance - Integrated control strategy - Matching performance - Mathematics model - Road tests - Simulation - Theoretic analysis  - Tunable damper - Vehicle body
Classification code:432 Highway Transportation - 601.2 Machine Components - 632.1 Hydraulics - 663.1 Heavy Duty Motor Vehicles - 731.1 Control Systems - 931.1 Mechanics
DOI:10.3969/j.issn.1002-6819.2012.11.013
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 36>

Accession number:20124215567579
Title:Numerical simulation of flow around circular cylinder in pin pulverizer
Authors:Huang, Peng (1); Li, Shuangyue (1); Diao, Xiong (1)
Author affiliation:(1) School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Corresponding author:Li, S.(shuangyue-58@263.net)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:27-34
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to investigate the aerodynamic performance of circular cylinders in a pin pulverizer, the computational fluid dynamics method was applied in the study of flow past a circular cylinder nail in a 2D model. The problem of flow around a circular cylinder in uniform inflow was used to verify the correctness of the computational model. The independence of mesh and time step were also investigated. The results showed that flows could be classified into three flow regimes when Reynolds numbers varied within 200. In the stable separating regime, the max length of closed wakes was approximately equaled to the diameter of the cylinder, and the wakes would vanish as the increasing of Reynolds number. In the unstable vortex shedding regime, periodical vortices shedding occurred at low Reynolds numbers. Lift force and drag force on the cylinder were small. As Reynolds number grew, the dimensionless frequency increased and different frequency components appeared. The dimensionless frequency was one order of magnitude smaller than that of the flow around a cylinder in uniform inflow. It lays the foundation of the research on the problem of flow around cylinders at high Reynolds numbers.
Number of references:25
Main heading:Aerodynamics
Controlled terms:Circular cylinders - Computational fluid dynamics - Computer simulation - Diesel engines - Flow fields - Grinding mills - Reynolds number - Wakes
Uncontrolled terms:2-D model - Aerodynamic performance - Computational fluid dynamics methods - Computational model - Diesel engine emissions - Different frequency - Dimensionless frequency - Drag forces - Flow around a circular cylinder - Flow around a cylinder  - Flow around circular cylinder - Flow around cylinder - Flow regimes - High Reynolds number - Lift force - Low Reynolds number - Time step - Uniform inflow
Classification code:408.2 Structural Members and Shapes - 612.2 Diesel Engines - 631.1 Fluid Flow, General - 651.1 Aerodynamics, General - 723.5 Computer Applications - 802.1 Chemical Plants and Equipment
DOI:10.3969/j.issn.1002-6819.2012.11.005
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 37>

Accession number:20124215567612
Title:Preparation and characteristics of foamed bamboo shell/starch composite
Authors:Wang, Hualin (1); Chu, Hongliang (1); Huang, Jun (1); Jiang, Shaotong (2)
Author affiliation:(1) School of Chemical Technology, Hefei University of Technology, Hefei 230009, China; (2) School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, China
Corresponding author:Wang, H.(hlwang@hfut.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:243-247
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to reduce environment pollution from waste bamboo shoot shell, starch/bamboo shoot shell foam composites were synthesized by baking method from the mixture of bamboo shell and corn starch. Response surface analysis was conducted by using software Design Expert Version 7.0.0 to optimize the foaming parameters, and the foam composites were characterized and analyzed with Fourier transform infrared spectroscopy, scanning electron microscope. The results showed that the interaction effects among NaOH solution mass fraction, 2, 2'-Azobis (2-methylpropionitrile) and Na<inf>2</inf>B<inf>4</inf>O<inf>7</inf>&middot10H<inf>2</inf>O dosage on the density of foam composites were significant. With bamboo shoot shell powder of 5 g, corn starch of 2.5 g, foaming temperature of 66&deg;C and foaming time of 10 h, the optimized condition was as following: NaOH mass fraction 9.8%, 2, 2'-Azobis (2-methylpropionitrile) 1.4 g and Na<inf>2</inf>B<inf>4</inf>O<inf>7</inf>&middot10H<inf>2</inf>O 0.26 g. At above condition, the holes with thin wall in foam composites were fine and uniform, and most holes were circle or similar. The coordinate linkage reaction occurred between bamboo shoot shell fiber and starch through Na<inf>2</inf>B<inf>4</inf>O<inf>7</inf>&middot10H<inf>2</inf>O besides the hydrogen bonds. The results can provide references for improving the properties of starch foamed material and comprehensive utilization for the bamboo industry resources.
Number of references:25
Main heading:Foams
Controlled terms:Bamboo - Fourier transform infrared spectroscopy - Hydrogen bonds - Optimization - Scanning electron microscopy - Shells (structures) - Sodium - Starch - Surface analysis - Synthesis (chemical)
Uncontrolled terms:Baking method - Bamboo shells - Corn starch - Environment pollution - Foam composites - Foamed materials - Foaming temperature - Industry resources - Interaction effect - Mass fraction  - NaOH solutions - Optimized conditions - Response surface analysis - Scanning Electron Microscope - Shell powder - Thin walls
Classification code:921.5 Optimization Techniques - 821.4 Agricultural Products - 804.1 Organic Compounds - 804 Chemical Products Generally - 802.2 Chemical Reactions - 951 Materials Science - 801.4 Physical Chemistry - 741.1 Light/Optics - 549.1 Alkali Metals - 423 Non Mechanical Properties and Tests of Building Materials - 408.2 Structural Members and Shapes - 801 Chemistry
DOI:10.3969/j.issn.1002-6819.2012.11.039
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 38>

Accession number:20124215567590
Title:Similarity criterion in physical simulation of rainfall and sheet flow
Authors:Sun, Sanxiang (1); Zhang, Yunxia (1)
Author affiliation:(1) School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (2) Eng. Res. Center for Cold and Arid Regions Water Resource Comprehensive Utilization, Min. of Edu., Lanzhou 730070, China
Corresponding author:Sun, S.(sunsanxiang@mail.lzjtu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:93-98
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:At present, rainfall runoff simulations using Froude (Fr) criterion give rise to the large difference results between simulated and field situations. Using theoretic analytic method, similarity criterion in physical simulation of rainfall runoff was determined through comparing the magnitude of each applied force in the course of the rainfall runoff. Rationality and accuracy of the similarity criterion were validated with the experimental data. Suspended similar conditions were carried out depending on the flow velocity distribution of the thin layer of uniform flow. It was concluded that Re criterion was leading when the diameters of raindrops were less than 1.0 mm, otherwise there could be no similarity criterion. Rainfall similarity was determined by sheet flow similar leading criteria, which was the Weber (We) criteria and the scale of the geometric should be greater than 10, taking into account the variable amplitude of the normal raindrops diameters were 0.1-3.5 mm. The research can provide a reference for experimental design of rainfall and sheet flow simulation.
Number of references:29
Main heading:Rain
Controlled terms:Drops - Runoff
Uncontrolled terms:Analytic method - Applied forces - Physical simulation - Rainfall runoff - Rainfall-runoff simulations - Reynolds similarity - Sheetflows - Similarity criteria - Simulation - Thin layers  - Uniform flow - Variable amplitudes
Classification code:443 Meteorology - 444.1 Surface Water
DOI:10.3969/j.issn.1002-6819.2012.11.016
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 39>

Accession number:20124215567592
Title:Characteristics of nutrient loss from surface runoff of terraced orchards under different scales
Authors:Zhang, Zhanyu (1); Zhang, Wei (1); Yang, Jie (2); Wu, Yuncong (1); Wang, Bangwen (2); Zhang, Jie (2)
Author affiliation:(1) College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China; (2) Soil and Water Conservation Research Institute of Jiangxi Province, Nanchang 330000, China
Corresponding author:Zhang, Z.(zhanyu@hhu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:105-109
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:In order to study the nutrient loss from surface runoff in terraced orchards at different scales, the field experiments under two typical rainfalls and two different scales (Scheme 1: runoff plot scale, Scheme 2: natural slope scale)were performed to investigate characteristics of the runoff, sediment yield, and N and P transfer process in Soil Conservation Ecological Science and Technology Demonstration Park in Jiangxi province from April to September in 2011. The results showed that the runoff and sediment yield per unit area in Scheme 2 were fairly smaller than that in scheme 1, which accounted for 23.09%, 13.63% of that in Scheme 1 under moderate rain, and 27.49%, 13.72% of that in Scheme 1 under heavy rain. The processes of runoff and sediment yields of Scheme 1 and Scheme 2 were basically similar along with changes of the intensity of rainfall. The nutrition loss was mainly in the initial stage, and homogeneously stable in the later stage.
Number of references:22
Main heading:Runoff
Controlled terms:Nitrogen - Orchards - Phosphors - Rain - Sedimentology - Sediments - Soil conservation
Uncontrolled terms:Different scale - Ecological science - Field experiment - Heavy rains - Initial stages - Jiangxi Province - Nutrient loss - Nutrition loss - Per unit - Rain type  - Sediment yields - Surface runoffs - Transfer process
Classification code:443.3 Precipitation - 444.1 Surface Water - 481.1 Geology - 483 Soil Mechanics and Foundations - 804 Chemical Products Generally - 821.3 Agricultural Methods
DOI:10.3969/j.issn.1002-6819.2012.11.018
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 40>

Accession number:20124215567617
Title:Experimental study on measurement of restitution coefficient of wheat seeds in collision models
Authors:Wang, Chengjun (1); Li, Yaoming (1); Ma, L&#252;zhong (3); Ma, Zheng (1)
Author affiliation:(1) Institute of Modern Agricultural Equipment and Technology, Key Laboratory of Ministry of Education, Zhenjiang 212013, China; (2) College of Mechanical Engineering, Anhui University of Science and Technology, Huainan 232001, China; (3) College of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Li, Y.(ymli@ujs.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:274-278
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:To establish collision models of wheat seeds that on cleaning screen or seeds sower, a wheat restitution coefficient test device was build based on principle of kinematics equation in the paper, which was used to test the elastic properties of wheat seeds. Yangmai No. 17 which is widely cultivated in Jiangsu, Zhejiang, Anhui province was chosen in the test and the mixed orthogonal design was used to investigate the factors that influencing the restitution coefficient of wheat such as collision material, sheet thickness, drop height and moisture content of wheat. Results indicate that the primary and secondary order of factors affecting restitution coefficient of wheat are impact material, drop height, sheet thickness and moisture content of wheat. The restitution coefficient of wheat decreases with the falling height increasing, but increases with the sheet thickness increasing. Wheat moisture content has little influence on the restitution coefficient. The results can provide a reference for the simulation and product design of cleaning screen in combined harvesters and precision seeds sower machine.
Number of references:23
Main heading:Moisture determination
Controlled terms:Elasticity - Experiments - Kinematics - Models - Product design - Rope
Uncontrolled terms:Anhui province - Collision - Collision model - Drop height - Elastic properties - Experimental studies - Kinematics equation - Orthogonal design - Restitution coefficient - Sheet thickness  - Wheat - Wheat seeds - Zhejiang
Classification code:535 Rolling, Forging and Forming - 901.3 Engineering Research - 902.1 Engineering Graphics - 913.1 Production Engineering - 931.1 Mechanics - 944.2 Moisture Measurements
DOI:10.3969/j.issn.1002-6819.2012.11.044
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 41>

Accession number:20124215567578
Title:Design and experiment on biomass pellet densifying machine for banana stem
Authors:Zhang, Xirui (1); Wang, Junlin (1); Li, Yue (1); Wang, Tao (1); Qiu, Qianqian (1)
Author affiliation:(1) Institute of Electrical and Mechanical Engineering, Hainan University, Haikou 570228, China
Corresponding author:Li, Y.(liyue_888888@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:22-26
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Aiming at the present situation regarding the handling of the coarse banana straws which are labor intensive, high water content, and unavailability of satisfactory straw solid molding equipment in the tropical agricultural areas of China, the biomass pellet densifying machine for banana stem was designed. The main structural parameters of screw extrusion device, mixing device, extrusion device and draining mechanism were determined. The results of machine performance test showed that the productivity was 358 kg/h, forming rate of particle fuel was 95.4%, mechanical durability was 96.7%, particle density was 1.35 g/cm³, and particle moisture content was 2.76%. The machine can meet the requirements of biomass pellet fuel forming, which has durable, stable and reliable performance, as while as obvious economical and ecological benefit. It will have the broad prospect of application in the tropical agricultural areas in China.
Number of references:27
Main heading:Agricultural machinery
Controlled terms:Agriculture - Biomass - Design - Durability - Experiments - Extrusion molding - Fruits - Molding - Pelletizing - Screws
Uncontrolled terms:Agricultural areas - Banana stem - Biomass pellet fuels - Biomass pellets - Ecological benefits - Forming rate - High water content - Labor intensive - Machine performance - Mechanical durability  - Mixing devices - Particle densities - Particle fuels - Present situation - Reliable performance - Screw extrusion - Solid molding - Structural parameter
Classification code:821 Agricultural Equipment and Methods; Vegetation and Pest Control - 816.1 Processing of Plastics and Other Polymers - 816 Plastics and Other Polymers: Processing and Machinery - 901.3 Engineering Research - 802.3 Chemical Operations - 421 Strength of Building Materials; Mechanical Properties - 408 Structural Design - 605 Small Tools and Hardware
DOI:10.3969/j.issn.1002-6819.2012.11.004
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 42>

Accession number:20124215567614
Title:Experimental study on temperature field distribution characteristics in fresh-keeping transportation
Authors:Zhang, Dongxia (1); L&#252;, Enli (1); Lu, Huazhong (1); Yang, Songxia (1); Han, Xu (1)
Author affiliation:(1) Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou 510642, China; (2) College of Engineering, South China Agricultural University, Guangzhou 510642, China
Corresponding author:Lu, H.(huazlu@scau.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:254-260
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:A special test platform based on pressure difference principle was established to investigate the temperature distribution in fresh-keeping transportation room. The effects of airflow velocity and length of return airway, aperture ratio, stack mode, and ventilation slot on the characteristics of temperature distribution in fresh-keeping container were analyzed by varying the experimental levels. The results indicated that better temperature distribution homogeneity obtained with greater velocity and longer return airway. Stack mode had great effect on the temperature distribution. When the stack mode was adopted with interspaces in the middle and two sides, the temperature distribution homogeneity was the best. The aperture ratio had notable effect on temperature distribution homogeneity. The temperature distribution was better with air duct system in the fresh-keeping room than that without air duct system. Under the condition with air velocity of 8 m/s, the length of return airway of 1.5 m, the aperture ratio of 16.11%, the stack mode with interspaces in the middle and two sides, and with ventilation slot, the temperature distribution homogeneity was better with the temperature standard deviation of 1.15&deg;C and 2.04&deg;C in longitudinal section and cross section of preservation room respectively. The research achievements are instructive to optimization design of the structure of fresh-keeping room.
Number of references:21
Main heading:Temperature distribution
Controlled terms:Air - Optimization - Temperature - Transportation
Uncontrolled terms:Air ducts - Air flow velocity - Air velocities - Aperture ratio - Banana - Cross section - Distribution - Experimental studies - Fresh-keeping - Homogeneity  - Longitudinal section - Optimization design - Pressure differences - Temperature field distribution - Temperature standard - Test platforms
Classification code:921.5 Optimization Techniques - 804 Chemical Products Generally - 641.1 Thermodynamics - 434 Waterway Transportation - 433 Railroad Transportation - 432 Highway Transportation - 431 Air Transportation
DOI:10.3969/j.issn.1002-6819.2012.11.041
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 43>

Accession number:20124215567604
Title:Experimental study on physical property of smashed crop straw
Authors:Huo, Lili (1); Meng, Haibo (2); Tian, Yishui (2); Zhao, Lixin (2); Hou, Shulin (1)
Author affiliation:(1) College of Engineer, China Agricultural University, Beijing 100083, China; (2) Chinese Academy of Agricultural Engineering, Beijing 100125, China
Corresponding author:Hou, S.(hsl010@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:189-195
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:6 kinds of corn straws from different areas and 5 kinds of different crop straws were dried naturally and grinded into powder with diameters of 0-10 mm to study the physical properties of the crop straws. The results showed that densities of the natural and compressed crop straws were 37.43-140 kg/m³ and 48.40-200 kg/m³ respectively, the static and dynamic stacking angles were 44&deg;-51&deg; and 17&deg;-31&deg; respectively. The static friction coefficient between crop straws and metal or rubber was 0.45-0.55 or 0.51-0.62, and the coefficient of internal friction was 0.53-0.73. The stacking angles and the bulk densities were different for different kind of the crop straws or straws from different areas. The bulk density was affected by the kind and the uniformity of the crop straws. The difference of bulk density between different kinds of crop straws was very huge. The more the water was in the crop straws, the bigger the stacking angle was. There was no change of the friction coefficient and flow property. It could be inferred that the difference of the area and the kind of the crop straws should be fully considered when the crop straws were compressed, delivered and stored. This study can provide basic data support for the use of crop straws.
Number of references:21
Main heading:Crops
Controlled terms:Experiments - Friction - Physical properties
Uncontrolled terms:Accumulated angle - Bulk density - Corn straws - Data support - Experimental studies - Flow properties - Friction coefficients - Stacking angle - Static and dynamic - Static friction coefficient
Classification code:821.4 Agricultural Products - 901.3 Engineering Research - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids
DOI:10.3969/j.issn.1002-6819.2012.11.031
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 44>

Accession number:20124215567615
Title:Variation of moisture content in cabbage seeds with heat pump intermittent drying
Authors:Zhao, Haibo (1); Yang, Zhao (1)
Author affiliation:(1) School of Mechanical Engineering, Tianjin University, Tianjin 300072, China; (2) School of Ocean, Yantai University, Yantai 264005, China
Corresponding author:Yang, Z.(zhaoyang@tju.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:261-267
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Aimed at studying the moisture diffusion mechanism inside the seeds during heat pump drying, a nonhomogeneous dynamic mass transfer model was set up for cabbage seeds analyze the moisture diffusion in the cabbage seed under conditions of continuous drying with constant temperature and intermittent drying with on/off pulsating of air velocity. Results showed that the simulation results coincided well with experimental data with correlation coefficient of 0.9974 and relative deviation being less than &plusmn;10%. With the heat pump intermittent drying, the moisture distribution inside the cabbage seed was more uniform. With intermittency ratio of 1/3 and on-time in the intermittent drying cycle of 400 s, nearly 50% energy conservation for the heat pump equipment could be achieved during the drying process. This research can provide a reference for application of heat pump drying technique.
Number of references:30
Main heading:Drying
Controlled terms:Air - Diffusion - Heat pump systems - Models - Moisture - Moisture determination - Seed
Uncontrolled terms:Air velocities - Constant temperature - Correlation coefficient - Drying cycle - Drying process - Heat pump drying - Heat pumps - Intermittency - Mass transfer models - Moisture diffusion  - Moisture distribution - Non-homogeneous - Relative deviations
Classification code:931.1 Mechanics - 902.1 Engineering Graphics - 821.4 Agricultural Products - 944.2 Moisture Measurements - 804 Chemical Products Generally - 642.1 Process Heating - 641.2 Heat Transfer - 801.4 Physical Chemistry
DOI:10.3969/j.issn.1002-6819.2012.11.042
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 45>

Accession number:20124215567599
Title:Retrieving LAI by assimilating time series HJ CCD data with WOFOST
Authors:Zhao, Hu (1); Pei, Zhiyuan (1); Ma, Shangjie (1); Wang, Lianlin (2); Ma, Zhiping (2)
Author affiliation:(1) Chinese Academy of Agricultural Engineering, Beijing 100125, China; (2) Yutian Agriculture Planning Office, Yutian 064100, China
Corresponding author:Pei, Z.(peizhiyuan@tom.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:158-163
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:For the accuracy improvement of retrieving Leaf Area Index (LAI) from remote sensing images, the least square method was used as the algorithm to assimilate time series HJ CCD images with WOFOST based on its fundamental principals analysis. The calibrated crop growth model was then used for crop growth monitoring and yield estimation in Yutian, Hebei province. The results showed that the error of yield and LAI compared with their site specific counterparts were improved by 2.28% and 4.98% respectively, which shows the feasibility of the presented method and provides a new choice for spatialising crop growth model at regional scale.
Number of references:31
Main heading:Time series
Controlled terms:Algorithms - Image reconstruction - Least squares approximations - Remote sensing
Uncontrolled terms:Accuracy Improvement - Assimilation - CCD images - Crop growth - Crop growth model - Hebei Province - LAI - Leaf Area Index - Least square methods - Regional scale  - Remote sensing images - Site-specific - WOFOST - Yield estimation
Classification code:723 Computer Software, Data Handling and Applications - 731.1 Control Systems - 741 Light, Optics and Optical Devices - 921 Mathematics - 921.6 Numerical Methods - 922.2 Mathematical Statistics
DOI:10.3969/j.issn.1002-6819.2012.11.026
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.

<RECORD 46>

Accession number:20124215567606
Title:Ammonia stripping control parameters for improving effluent treatment effect in anaerobic digesters of piggery wastewater
Authors:Sui, Qianwen (1); Dong, Hongmin (1); Zhu, Zhiping (1); Guo, Dongpo (1)
Author affiliation:(1) Animal Environmental Facility Surveillance, Inspection and Testing Center, Ministry of Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Beijing 100081, China
Corresponding author:Dong, H.(Donghm@mail.caas.net.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:11
Issue date:June 1, 2012
Publication year:2012
Pages:205-211
Language:Chinese
ISSN:10026819
CODEN:NGOXEO
Document type:Journal article (JA)
Publisher:Chinese Society of Agricultural Engineering, Agricultural Exhibition Road South, Beijing, 100026, China
Abstract:Effluent from anaerobic digesters, which contains high ammonium concentration and with low C/N ratio, can not be treated effectively by using traditional biochemistry methods. In this study, ammonia stripping was used to decrease ammonium concentration in effluent from anaerobic digesters of piggery wastewater. Influences of initial ammonium concentration, pH value, air flow to liquid flow ratio, temperature on ammonia removal rate were studied. The coagulation effect of Ca(OH)<inf>2</inf> was further explored. The results showed that the initial ammonium concentration of 500 or 900 mg/L had no significant difference on the ammonia removal rate; Ammonia removal rate could achieve 81.84% at the experiment condition with initial ammonium concentration of 900 mg/L, pH value of 10.5, air to liquid ratio of 2000, and temperature of 30&deg;C. A dose of Ca(OH)<inf>2</inf> 5 g/L performed a good coagulation effect, the removal rates of COD TP and PO<inf>4</inf>^3- were 30.13%, 97.44% and 98.76%, respectively, but the hardness increased by 106%. The results can provide a reference for the development of advanced treatment of biogas plant effluent.
Number of references:26
Main heading:Effluent treatment
Controlled terms:Ammonia - Biogas - Coagulation - Effluents - Liquids - Manures - pH - Slurries
Uncontrolled terms:Advanced treatment - Air flow - Ammonia removal - Ammonia stripping - Ammonium concentrations - Anaerobic digester - Biogas plants - C/N ratio - Control parameters - Experiment condition  - Liquid flow - Manure treatment - pH value - Piggery wastewater - Removal rate
Classification code:804.2 Inorganic Compounds - 804 Chemical Products Generally - 802.3 Chemical Operations - 801.1 Chemistry, General - 931.2 Physical Properties of Gases, Liquids and Solids - 533 Ore Treatment and Metal Refining - 522 Gas Fuels - 452.4 Industrial Wastes Treatment and Disposal - 452.3 Industrial Wastes - 524 Solid Fuels
DOI:10.3969/j.issn.1002-6819.2012.11.033
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.