<RECORD 1>
Accession number:20123515381898
Title:Development of distributing device for large vertical dryer
Authors:Huang, Zhengming (1); Tan, Hequn (1); Lu, Rui (1)
Author affiliation:(1) College of Engineering, Huazhong Agriculture University, Wuhan 430070, China
Corresponding author:Tan, H.(thq@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:251-256
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 the process of drying, material distributing uniformity has a directly impact on the action effects of dry medium, then affects the drying uniformity of material. A distributing device which consisted of revolving distributing and reciprocating raking was designed to realize the uniformity. Single factor and orthogonal experiment were used to analyze the influence of device primary structure and technological parameters with the target of material surface flatness. The experimental results showed that the best parameters combination were at the distributing plate rotate speed of 50 r/min, the height of distributing plate of 680 mm, the installation angle of blade of 45°, under which the material surface was the most uniform and the coefficient of variation was 7.551%, and the minimum heights of material surface accounting for 62.58% of the maximum value. The designed distributing device can meet the requirements of distributing uniformity.
Number of references:23
Main heading:Dryers (equipment)
Controlled terms:Design - Experiments - Plates (structural components) - Surface properties
Uncontrolled terms:Action effect - Coefficient of variation - Distributing device - Evenness - Installation angle - Material surface - Maximum values - Orthogonal experiment - Primary structures - Rotate speed - Technological parameters
Classification code:408 Structural Design - 408.2 Structural Members and Shapes - 802.1 Chemical Plants and Equipment - 901.3 Engineering Research - 951 Materials Science
DOI:10.3969/j.issn.1002-6819.2012.13.040
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 2>
Accession number:20123515381899
Title:Establishment of growth probability model for Pseudomonas spp. in chilled pork with modified atmosphere package
Authors:Qiu, Jing (1); Dong, Qingli (1); Cheng, Fei (1)
Author affiliation:(1) School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Corresponding author:Dong, Q.(dongqingli@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:257-262
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 extend the shelf life of chilled pock and to provide reference for the choice of atmosphere package, this study simulated the real production, and established the growth probability model of Pseudomonas spp. in chilled pork with atmosphere modified packaged at (4±1)°C. Logistic model was used to establish the growth/non-growth boundary of Pseudomonas spp. in different percentage of CO<inf>2</inf>. The disinfected pock was inoculated with Pseudomonas spp., which is one kind of specific spoilage organisms of the chilled pock. The results indicated that without CO<inf>2</inf> or with low percentage of CO<inf>2</inf>, the growth probability of Pseudomonas spp. increased with the increase of percentage of O<inf>2 </inf>or the initial inoculation. With high percentage of CO<inf>2</inf>, the growth probability of Pseudomonas spp. was low, and not sensitive to the percentage of O<inf>2</inf>, and initial inoculation. The Logistic model performed well, which determination coefficient (r<sup>2</sup>) of the model was higher than 0.85, the determination coefficient (R<sup>2</sup>) of observed data and predicted data were all higher than 0.95, and the predicted accuracy was higher than 93.3%. Four predicted conditions of the probability model were defined as "effective-safe", "effective-dangerous", "ineffective-safe", "ineffective-dangerous" in this paper, which were used to evaluate the validity of the model and to ensure the safe choice of the atmosphere condition. The results can provide technological references for the choice of atmosphere condition in the chilled pock production.
Number of references:31
Main heading:Modified atmosphere packaging
Controlled terms:Bacteria - Carbon dioxide - Computer simulation - Meats - Models - Packaging
Uncontrolled terms:Chilled pork - Determination coefficients - Growth probability - Logistic models - Modified atmosphere - Modified atmosphere package - Observed data - Probability models - Pseudomonas spp - Shelf life - Specific spoilage organisms
Classification code:461.9 Biology - 694.1 Packaging, General - 723.5 Computer Applications - 804.2 Inorganic Compounds - 822.3 Food Products - 902.1 Engineering Graphics
DOI:10.3969/j.issn.1002-6819.2012.13.041
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 3>
Accession number:20123515381876
Title:Effects of controlled drainage and nitrogen fertilizer application on nitrogen migration and transformation in dryland
Authors:Yuan, Niannian (1); Huang, Jiesheng (1); Huang, Zhiqiang (3); Xie, Hua (2); Wu, Mousong (2)
Author affiliation:(1) Yangtze River Scientific Research Institute, Wuhan 430015, China; (2) State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; (3) Hubei Water Resources Research Institute, Wuhan 430072, China
Corresponding author:Huang, J.(jshuanga@public.wh.hb.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:106-112
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 effect of combination of controlled drainage and nitrogen application on nitrogen migration and transformation in dryland, a compared test-pit experiment was conducted in Yajiao Drainage and Irrigation Station in Hubei province. Nine treatments, named H30, H50, H100, C30, C50, C100, L30, L50 and L100 were studied with two factors, controlled drainage water table with three levels 30, 50 and 100 cm, and nitrogen application with three levels, high, conventional and low level. Nitrate and ammonia contents in the soil layers were measured. Results showed that under the conventional nitrogen application level, nitrate content was highest in the treatment C100, and lowest in the treatment C50. Under the low nitrogen application level, ammonia content was highest in the treatment L30. When the water table was same, ammonia content was lowest in the treatment H30, H50 and H100. When the nitrogen application level was same, ammonia content sorted by controlled water table was 30 > 50 > 100 cm. Under the same nitrogen application level, controlled drainage can improve the stability of the nitrogen. Under the controlled drainage condition, there was no need to increase or decrease the nitrogen application while the nitrogen stability was high. Under the conventional drainage condition, reducing the nitrogen application can promote the nitrogen stability.
Number of references:24
Main heading:Nitrogen
Controlled terms:Ammonia - Groundwater - Irrigation - Nitrogen fertilizers - Soils - Stability - Wastewater disposal
Uncontrolled terms:Application level - Controlled drainage - Drainage condition - Dryland - Fertilizer applications - Hubei Province - Low level - Nitrogen migration - Soil layer - Water tables
Classification code:951 Materials Science - 931 Classical Physics; Quantum Theory; Relativity - 821.3 Agricultural Methods - 804.2 Inorganic Compounds - 961 Systems Science - 804 Chemical Products Generally - 483.1 Soils and Soil Mechanics - 452.4 Industrial Wastes Treatment and Disposal - 444.2 Groundwater - 801 Chemistry
DOI:10.3969/j.issn.1002-6819.2012.13.018
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 4>
Accession number:20123515381884
Title:Monitoring vegetation coverage variation of winter wheat by low-altitude UAV remote sensing system
Authors:Li, Bing (1); Liu, Rongyuan (1); Liu, Suhong (1); Liu, Qiang (2); Liu, Feng (1); Zhou, Gongqi (1)
Author affiliation:(1) School of Geography, Beijing Normal University, 100875, Beijing, China; (2) State Key laboratory of Remote Sensing Science, Beijing Normal University, 100875, Beijing, China; (3) College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China
Corresponding author:Liu, S.(liush@bnu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:160-165
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:As a complement to satellite observation, the technique of Unmanned Aerial Vehicle (UAV) shows great advantages in monitoring crop stages at a large scale because of its high spatiotemporal resolutions, low cost and risk in field measurements. With the objective to validate the availability of UAV in reality, this paper designed and established a low-altitude land surface UAV observation system consisted of a UAV platform and a multispectral camera to obtain images of winter wheat at its five growth stages. On basis of these images, this paper proposed a new approach that using time-series histograms of vegetation index to refine the threshold value in the VI-threshold method for extracting vegetated pixels from images. The results show that the UAV system is available to obtain surface images feasibly and the new vegetated pixel retrieval method can provide reasonable fractional vegetation cover (FVC) which is generally consistent with the five growth stages of the winter wheat. Moreover, this paper also investigated the spatial scaling effects of estimate FVC using the images from the UAV system.
Number of references:30
Main heading:Unmanned aerial vehicles (UAV)
Controlled terms:Crops - Monitoring - Pixels - Remote sensing - Vegetation
Uncontrolled terms:Fractional vegetation cover - Growth stages - In-field - Land surface - Low costs - Low-altitude - Multi-spectral cameras - Observation systems - Remote sensing system - Retrieval methods - Satellite observations - Spatial scaling - Spatio-temporal resolution - Surface image - UAV platform - UAV systems - Vegetation coverage - Vegetation index - Winter wheat
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 - 821.4 Agricultural Products - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 731.1 Control Systems - 723.5 Computer Applications - 652.1 Aircraft, General
DOI:10.3969/j.issn.1002-6819.2012.13.026
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 5>
Accession number:20123515381866
Title:Fast positioning method of apple harvesting robot for oscillating fruit
Authors:Lü, Jidong (1); Zhao, De'an (1); Ji, Wei (1); Chen, Yu (1); Shen, Huiliang (1); Zhang, Ying (1)
Author affiliation:(1) School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Zhao, D.(dazhao@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:48-53
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:A kind of fast positioning and harvesting method in oscillation condition for the harvesting robot was researched in order to solve the problem of fruit oscillation influence on harvesting efficiency of harvesting robot. Firstly, it needs to obtain the dynamic and continual images of the oscillatory fruit, then images are recognized and its two-dimensional centroid coordinates are extracted, and then the fruit oscillation period is calculated by FFT algorithm. With measurement of the depth distance of the oscillating fruit, the forward moving speed of the translation joint for the harvesting robot is calculated, and then the harvesting robot starts to harvest, the oscillatory fruit is in balance when it is grabbed. The test results showed that the rate of successful harvesting was 84%, the presented method was better than ever before harvesting method for the oscillating fruit harvest and this method can significantly improve the harvesting speed. In addition, this method is simple and universal, can meet the need of apple and other near-spherical fruit harvesting robot, and the method can provide a reference for realization of practicability and commercialization.
Number of references:21
Main heading:Harvesting
Controlled terms:Fast Fourier transforms - Fruits - Image processing - Robots
Uncontrolled terms:Fast positioning - FFT algorithm - Fruit harvesting - Harvesting robot - Moving speed - Oscillation periods
Classification code:731.5 Robotics - 741 Light, Optics and Optical Devices - 821.3 Agricultural Methods - 821.4 Agricultural Products - 921.3 Mathematical Transformations
DOI:10.3969/j.issn.1002-6819.2012.13.008
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 6>
Accession number:20123515381863
Title:Development of single outstretch pole magnetorheological damper on tractor front suspension
Authors:Ma, Ran (1); Zhu, Sihong (1); Yi, Lidaer (1); Shi, Junlong (1); Talpur, M.A. (1)
Author affiliation:(1) College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
Corresponding author:Zhu, S.
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:28-33
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 to the problem of poor performance of tractor vibration, a flow pattern was developed on the basis of a damping force mathematical model, which was presented with analyzing working pattern of the magnetorheological damper(MRD). According to working requirements of large wheel tractor front axle suspension, a single outstretch pole MRD was designed. Experiments were conducted to assess the impact of input current and the excitation rate on the shock absorber damping force. It is observed that the damping force controllable ratio reaches 5.9 in low speed situation. Whereas, it increases with the applied current to its peak value of 1.8 A and the maximum output damping force reaches at 1 370 N. Perceived results justify the validity of the design, and provide the evidence for controlling semi-active air suspension with adjustable damping.
Number of references:30
Main heading:Suspensions (components)
Controlled terms:Damping - Design - Mathematical models - Poles - Suspensions (fluids) - Tractors (agricultural) - Tractors (truck)
Uncontrolled terms:Air suspension - Applied current - Damping forces - Excitation rate - Input current - Low speed - Magneto-rheological dampers - Magnetorheological damper - Maximum output - Peak values - Poor performance - Semi-active - Working patterns
Classification code:931.1 Mechanics - 921 Mathematics - 804 Chemical Products Generally - 663.1 Heavy Duty Motor Vehicles - 601.2 Machine Components - 408.2 Structural Members and Shapes - 408 Structural Design
DOI:10.3969/j.issn.1002-6819.2012.13.005
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 7>
Accession number:20123515381870
Title:Analysis model of total flow rate of centrifugal pumps in parallel operation for pressure pumping station of drip irrigation system
Authors:Li, Mingsi (1); Lan, Mingju (1); Lu, Tingbo (1)
Author affiliation:(1) College of Water Conservancy and Architecture Engineering, Shihezi University, Shihezi 832003, China
Corresponding author:Li, M.(leemince-709@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:72-76
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 determine the number of centrifugal pumps in parallel operation in the design of pressure pumping station for drip irrigation system, the models were developed on the principle of solving the duty point of pumps system operated in parallel to analyze the total flow rate of pumps system varied with the number of centrifugal pumps in parallel operation. It was obtained by the model analysis that the working flow rate of single centrifugal pump decreased with the number of parallel pumps, and the range of diminution decreased also; The total discharge of pumps system increased with the number of parallel pumps, but the range of increment decreased, which decay rate was large than that of single centrifugal pump flow capacity. An example was employed to verify the availability of the models for application. The results can provide a reference for design of pumping station for drip irrigation area.
Number of references:16
Main heading:Centrifugal pumps
Controlled terms:Decay (organic) - Flow rate - Irrigation - Models - Pumping plants - Pumps
Uncontrolled terms:Analysis models - Decay rate - Drip irrigation - Drip irrigation systems - Model analysis - Parallel operations - Pump flow - Pumping stations
Classification code:446 Waterworks - 618.2 Pumps - 631 Fluid Flow - 811.2 Wood and Wood Products - 821.3 Agricultural Methods - 902.1 Engineering Graphics
DOI:10.3969/j.issn.1002-6819.2012.13.012
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 8>
Accession number:20123515381900
Title:Effects of acid solvents on properties of kudzu starch/chitosan composite edible films
Authors:Zhong, Yu (1); Li, Yunfei (2)
Author affiliation:(1) Institute of Refrigeration and Cryogenic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; (2) Department of Food Science and Technology, Shanghai Jiao Tong University, Shanghai 200240, China; (3) Bor Luh Food Safety Center, Shanghai Jiao Tong University, Shanghai 200240, China
Corresponding author:Li, Y.(yfli@sjtu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:263-268
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 evaluate the effects of acid solvents on antibacterial, physical and mechanical properties of composite edible films, the kudzu starch-chitosan composite film-forming solutions were prepared by tape casting with mass fraction 1% of acetic acid, lactic acid and malic acid as solvents. For the film, 0.5g/L of ascorbic acid as the active additive, 0.6g/L of glycerol as the plasticizer and 0.1g/L of Tween 20 as the surfactant were added into the solutions. It was found that there was certain surface activity for film-forming solution, and acid solvent had no obvious impact on the surface tension of each solution. The types of acid solvents had obvious impact on the performance of composite films, in which the film with acetic-acid solvent had best mechanic strength, the mean tensile strength and puncture strength were 5.73 MPa and 8.63 N, respectively, and its solubility was the smallest, which was about 34%. The film made from lactic acid solution displayed the greatest flexible property, which mean elongation and puncture distance were 71.5% and 6.05 mm, respectively. The composite film using malic acid as solvent showed the best antibacterial activity against escherichia coli and staphylococcus aureus, which were 98.9% and 81.2%, respectively, and its water-tightness was best, which the water vapor permibility was 4.82×10<sup>-11</sup> g/(m·s·Pa). So different acid solvents can be selected to prepare films according to different requirements. The study results can provide theoretical references for the application of edible films.
Number of references:27
Main heading:Composite films
Controlled terms:Acetic acid - Bacteria - Casting - Chitosan - Escherichia coli - Films - Glycerol - Ketones - Lactic acid - Mechanical properties - Organic acids - Physical properties - Plasticizers - Solvents - Starch - Surface active agents - Surface tension
Uncontrolled terms:Acid solutions - Acid solvents - Anti-bacterial activity - Ascorbic acids - Edible films - Effects of acid - Film-forming - Malic acids - Mass fraction - Physical and mechanical properties - Puncture strength - Staphylococcus aureus - Surface activities - Tape casting - Tween-20
Classification code:933 Solid State Physics - 931.2 Physical Properties of Gases, Liquids and Solids - 804.1 Organic Compounds - 951 Materials Science - 803 Chemical Agents and Basic Industrial Chemicals - 534.2 Foundry Practice - 461.9 Biology - 714.2 Semiconductor Devices and Integrated Circuits
DOI:10.3969/j.issn.1002-6819.2012.13.042
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 9>
Accession number:20123515381877
Title:Effects of rainfall characteristics and covering methods on soil moisture of winter wheat
Authors:Liu, Zhandong (1); Gao, Yang (1); Liu, Zugui (1); Duan, Aiwang (1)
Author affiliation:(1) Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453003, China; (2) Key Laboratory for Crop Water Requirement and Regulation, Ministry of Agriculture, Xinxiang 453003, China; (3) Graduate University of Chinese Academy of Agricultural Sciences, Beijing 100081, China
Corresponding author:Duan, A.(duanaiwang@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:113-120
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 effects of different rainfall characteristics and covering methods on soil moisture of winter wheat, rainfall simulation with rainfall intensity of 40 and 60 mm/h was conducted by using the artificial rainfall simulator. Influences of different covering methods on soil moisture distribution and rainfall storage in soil layer of 0-60 cm under simulated rainfall situations were investigated with setting plastic mulching (PM), straw mulching with four quantities of 1500, 4500, 7500, and 10500 kg/hm<sup>2</sup> (SM15, SM45, SM75 and SM105) and no mulching (CK) in winter wheat field. Results indicated that before rainfall simulating, soil water content in all treatments of mulching was greater than that in CK, of which there was significantly difference in 0-20 cm soil layer (P<0.05) and a little difference beneath 20 cm soil layer, except for SM105, other treatments showed no significant difference compared with CK (P<0.05). Rainfall infiltration depth and volume with 60 mm/h of rainfall intensity was significantly greater than that with 40 mm/h under the same covering treatment and rainfall duration. Soil moisture in plough layer increased in different degrees in all treatments with the same rainfall intensity, which the greater the amount of straw mulch was, the more obvious the increase, but the effect of PM treatment was the worst. At two rainfall intensity conditions, the rainfall storage amount in 0-60 cm soil layer of each treatment had consistent order as SM105>SM75>SM45> SM15>CK>PM, of which SM105 and SM75 were significantly higher than that of CK (P<0.05) and the value of PM was significantly lower than that of CK (P<0.05). As effect of rainfall interception by plant canopy, the rainfall accumulation before the jointing stage was greater than that after the jointing stage under the same rainfall intensity and covering conditions. Compared to the rainfall intensity of 60 mm/h, there was a big difference for the rainfall accumulation amount of each treatment with 40 mm/h rainfall intensity before and after the jointing stage.
Number of references:22
Main heading:Rain
Controlled terms:Crops - Moisture - Soil moisture - Soils
Uncontrolled terms:Artificial rainfall - Cover - Plant canopies - Plastic mulching - Rainfall characteristics - Rainfall duration - Rainfall infiltration - Rainfall intensity - Rainfall interception - Rainfall simulations - Simulated rainfall - Soil layer - Soil moisture distribution - Soil water content - Straw mulch - Straw mulching - Winter wheat - Winter wheat field
Classification code:443.1 Atmospheric Properties - 443.3 Precipitation - 483.1 Soils and Soil Mechanics - 821.4 Agricultural Products
DOI:10.3969/j.issn.1002-6819.2012.11.019
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 10>
Accession number:20123515381867
Title:Dynamic analysis on picking process of cotton picker spindle
Authors:Zhang, Youqiang (1); Ma, Shaohui (1); Ding, Wangcai (2)
Author affiliation:(1) School of Mechanical and Electrical Engineering, Tarim University, Alar 843300, China; (2) School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Corresponding author:Ma, S.(ngynj@sina.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:54-58
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 resolve engineering practice problems such as cotton picker ingots were easily worn and broken during picking process, under these circumstances, the model of picking systems was built for one- degree-of-freedom dry friction oscillation according to its structural feature and oscillation behavior. Dynamic response of ingots during picking process with friction force was investigated, and the stick-slip vibration of system motion was analyzed. Thus, the actual dynamics characteristic during picking process was summarized by changing speed and structural parameter of ingot. As well, the suggestion was given to decrease the wear degree of cotton picker ingots by studying on the effects of dynamic behavior on ingot wear. The theoretical analysis and numerical results are applicable to the structural design and optimization of cotton picker ingots.
Number of references:25
Main heading:Ingots
Controlled terms:Cotton - Dynamic analysis - Dynamic response - Dynamics - Friction - Harvesters - Slip forming - Structural design - Tribology
Uncontrolled terms:Design and optimization - Dry friction - Dynamic behaviors - Dynamics characteristic - Engineering practices - Friction force - Numerical results - Oscillation behavior - Picking system - Stick-slip vibration - Structural feature - Structural parameter - System motion
Classification code:931 Classical Physics; Quantum Theory; Relativity - 821.4 Agricultural Products - 821.1 Agricultural Machinery and Equipment - 931.1 Mechanics - 534.2 Foundry Practice - 412 Concrete - 408.1 Structural Design, General - 422.2 Strength of Building Materials : Test Methods
DOI:10.3969/j.issn.1002-6819.2012.13.009
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 11>
Accession number:20123515381861
Title:Seed monitoring system for corn planter based on capacitance signal
Authors:Zhou, Liming (1); Wang, Shumao (1); Zhang, Xiaochao (2); Yuan, Yanwei (2); Zhang, Junning (2)
Author affiliation:(1) College of Engineering, China Agricultural University, Beijing 100083, China; (2) The State Key Laboratory of Soil, Plant and Machine System Technology, Beijing 100083, China
Corresponding author:Zhang, X.(zxc@caams.org.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 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:To improve the reliability of the seeding performance of corn planter, a monitoring system was developed based on capacitive sensor. In order to obtain constrained conditions of the electrode plate length, corn seed movement discipline and mechanism in the dropping process were analyzed theoretically. The detection circuits mainly consisted of microcomputer PIC18F2580, capacitive convert chip MS3110 and AD7685. The capacitive pluse peaks interval and curve integral were calculated, the information of seeding performance were obtained such as seeding quantity, missing rate and multiples rate. The experiment results showed that the system accuracy for single seed detection was up to 97.3%, and when the simulation velocity of the planter was 4.0 km/h, the system had an accuracy of 94.6% in seeding quantity, 93.5% in missing detection and 88.1% in multiples rate. This system can effectively monitor seeding performance and help to improve sowing quality.
Number of references:25
Main heading:Seed
Controlled terms:Capacitive sensors - Plants (botany) - Sensors
Uncontrolled terms:Capacitance signal - Capacitive - Constrained conditions - Corn - Corn seeds - Detection circuits - Electrode plates - Missing rate - Monitoring system - Performance monitors - System accuracy
Classification code:461.9 Biology - 732 Control Devices - 801 Chemistry - 821.4 Agricultural Products
DOI:10.3969/j.issn.1002-6819.2012.13.003
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 12>
Accession number:20123515381860
Title:Modal analysis of bionic convex teeth rolling component composed of different materials
Authors:Zhang, Zhihong (1); Tong, Jin (1); Chen, Donghui (1); Sun, Jiyu (1); Ma, Yunhai (1)
Author affiliation:(1) School of Biological and Agricultural Engineering, Jilin University (Nanling Campus), Changchun 130022, China; (2) The Key Laboratory of Bionic Engineering (Ministry of Education, China), Jilin University (Nanling Campus), 5988 Renmin Street, Changchun 130022, China
Corresponding author:Tong, J.(jtong@jlu.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:8-15
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:To investigate effects of bionic convex teeth rolling component composed of different materials, on adhesion-reducing and micro-basin processing performance, with the assist of Autodesk Algor Simulation software, modal analysis of rolling components made from cast iron material and UHMWPE-cast iron combinatorial material was performed. Using the anterior 8 ranks of modals, the natural frequency and maximum amplitude of the two types of rolling components were compared. It was found that at the anterior eight ranks of modal, the maximum amplitude at each ranks of UHMWPE-cast iron combinatorial material rolling component was higher than that of cast iron material, the increment was between 5.716 and 30.077 mm. Moreover, combinatorial material rolling component could reach higher amplitude at relatively lower natural frequency. Furthermore, near the center of the wheel disk, the average amplitude was 0.213 mm less than that of cast iron rolling component. The results show that compare with cast iron material rolling component, UHMWPE-cast iron combinatorial material rolling component can acquire the better adhesion reduction ability on the convex teeth, ensure the structural strength of the depressions on soil surface and have enhanced stability at the center of the wheel disk. These findings can give indications to the choice of materials for bionic convex teeth rolling component, speed setting for tractor and design of the excitation device on rolling components.
Number of references:32
Main heading:Strength of materials
Controlled terms:Adhesion - Agriculture - Bionics - Cast iron - Computer software - Materials - Modal analysis - Natural frequencies - Wheels
Uncontrolled terms:Algor - Autodesk - Cast iron materials - Combinatorial materials - Enhanced stability - Excitation devices - Investigate effects - Maximum amplitude - Micro-basin tillage - Processing performance - Simulation software - Soil surfaces - Speed settings - Structural strength - Vibration
Classification code:921 Mathematics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 731.1 Control Systems - 951 Materials Science - 723 Computer Software, Data Handling and Applications - 601.2 Machine Components - 545.2 Iron Alloys - 711.1 Electromagnetic Waves in Different Media
DOI:10.3969/j.issn.1002-6819.2012.13.002
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 13>
Accession number:20123515381880
Title:Soil-water characteristic curves of high-TDS and suitability of fitting models
Authors:Li, Xianwen (1); Zhou, Jinlong (1); Jin, Menggui (1); Liu, Yanfeng (1)
Author affiliation:(1) School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; (2) College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China
Corresponding author:Zhou, J.(zjzhoujl@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:135-141
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:Four soil treatments with different TDS water (freshwater, 30, 100 and 250 g/L) were prepared and their soil-water characteristic curves of drying processes were obtained based on the measured soil water content and soil hydraulic pressure. The results showed that the specific water capacities of these treatments was similar in the whole drying process with partly different. However, compared with the freshwater and the water with TDS of 30 g/L, scenarios of the higher TDS (100 and 250 g/L) water possessed a remarkably weaker ability of the water retention. Further analysis indicated that four scenarios had different soil-water characteristic curves in the different TDS background. During the variation of soil suction of the four treatments, which ranged from 0 to 1 00 kPa water column, median pore size of soil dealt by 30 g/L-water, small pore size of soil dealt by 100 g/L-water and large pore size of soil dealt by 250 g/L-water diminished. RETC software and mathematical statistics method were adopted for getting the optimum model that described soil-water characteristic curves of the four dealt soils. For the treatments with freshwater, 30 g/L-water, 100 g/L-water and 250 g/L-water, the optimum models were van Genuchten-Mualem model, Dual-porosity-Mualem model, Log normal distribution-Mualem model and Dual-porosity-Mualem model, respectively, and Mualem model was the best one to describe the unsaturated hydraulic conductivity of the all soils. On the other hand, it's difficult to explain the inherent mechanism of the best model for different TDS. The research results are useful for analysis of soil water and salt transport under high-TDS condition in arid areas.
Number of references:32
Main heading:Geologic models
Controlled terms:Arid regions - Curve fitting - Models - Moisture - Normal distribution - Pore size - Soil moisture - Soils - Statistics - Water
Uncontrolled terms:Arid area - Best model - Drying process - Fitting model - Large pore size - Log-normal - Optimum model - Research results - RETC - Salinity - Salt transport - Soil hydraulics - Soil suction - Soil treatments - Soil water - Soil water content - Soil-water characteristic curve - Specific water capacity - Unsaturated hydraulic conductivity - Water columns - Water retention
Classification code:951 Materials Science - 922.2 Mathematical Statistics - 922.1 Probability Theory - 902.1 Engineering Graphics - 483.1 Soils and Soil Mechanics - 481.1 Geology - 444 Water Resources - 443.1 Atmospheric Properties - 443 Meteorology
DOI:10.3969/j.issn.1002-6819.2012.13.022
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 14>
Accession number:20123515381868
Title:Chemical kinetics of ignition timing of diesel engine fueled with water emulsion diesel
Authors:Zhang, Wei (1); Shu, Gequn (1); Chen, Zhaohui (2); Shen, Yinggang (2); Weng, Jiaqing (2)
Author affiliation:(1) State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China; (2) Faculty of Transportation Engineering, Kunming University of Science and Technology, Kunming 650500, China
Corresponding author:Shu, G.(sgq@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:59-66
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 third edition of Lawrence Livermore National Laboratory (LLNL) n-heptane oxidation detail model, the chemical kinetics simulation was conducted using the parameters of a 4100QBZL-2 DI engine. The ignition delay time was investigated and simulated, with the engine fueled with pure diesel, 10%, 20% and 30%(by volume fraction) water-diesel emulsion. The chemical kinetics calculation results were compared with the experimental results and the computational fluid dynamics coupled with n-heptane reduced model (CFD-SKLE) calculation results. The results indicated that, the ignition time was delayed due to the physical phenomena of water in emulsified fuel. From a chemical view, the water in emulsion fuel can promote the formation of free radicals H, O, OH, HO<inf>2</inf> in n-heptane's low temperature reaction regime (cool flame). Those free radicals can create advantageous conditions for n-heptane high temperature reaction (hot flame) and advance the ignition timing. The sensitivity analysis results of n-heptane oxidation with water showed, the water will promote isomerization of alkyl peroxide and decomposition of hydrogen peroxide ketones in n-heptane low temperature reaction regime and consequently accelerate the n-heptane oxidation chain reactions.
Number of references:26
Main heading:Heptane
Controlled terms:Computational fluid dynamics - Computer simulation - Diesel engines - Emulsification - Free radicals - Fuel additives - Hydrogen peroxide - Ignition - Ketones - Kinetics - Numerical methods - Oxidation - Reaction kinetics - Temperature
Uncontrolled terms:Alkyl peroxides - Chain reaction - Chemical kinetics calculation - Chemical kinetics simulation - Cool flame - Emulsified fuel - High-temperature reaction - Ignition delay time - Ignition time - Ignition timing - Lawrence livermore national laboratories - Low temperature reactions - n-Heptanes - Physical phenomena - Reduced model - Water emulsion
Classification code:931 Classical Physics; Quantum Theory; Relativity - 921.6 Numerical Methods - 804 Chemical Products Generally - 803 Chemical Agents and Basic Industrial Chemicals - 802.3 Chemical Operations - 802.2 Chemical Reactions - 723.5 Computer Applications - 641.1 Thermodynamics - 612.2 Diesel Engines - 524 Solid Fuels - 523 Liquid Fuels - 522 Gas Fuels - 521.1 Fuel Combustion
DOI:10.3969/j.issn.1002-6819.2012.13.010
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 15>
Accession number:20123515381873
Title:Numerical simulation on cavitating characteristic in impeller of axial-flow pump
Authors:Shi, Weidong (1); Li, Tongtong (1); Zhang, Desheng (1); Wang, Guotao (1); Zhou, Ling (1)
Author affiliation:(1) Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Shi, W.(wdshi@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:88-93
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 internal cavitation characteristic of axial flow pump, the steady turbulent flow field of an axial flow pump(n<inf>s</inf>=1033) at different conditions was simulated by using standard κ-Ε turbulence model, RNG κ-Ε turbulence model, κ-ω turbulence model, SST κ-ω turbulence model and homogeneous multiphase model based on ANSYS CFX software. The numerical results were compared with the experiment values to verify the adaptability of the different turbulent models and multiphase model, and to study the cavitation characteristics of the impeller region. The results showed that the κ-Ε turbulence model has better accuracy than the other three turbulent models in simulation, predictive errors of critical NPSHc is 6.32%, which can reflect the internal cavitation characteristic of the axial flow pump well. With the decrease of the NPSH, along the flow direction, vapor first occurred on the leading edge of the blade close to the tip, and then developed to the middle area of the blades until to the whole passage. On the critical cavitation condition, the vapor area of the middle side along the radical direction of the blade is large. When the cavitation is serious, the streamline at the back of the blade's suction side is disorder and generate the vortex micro group, which will flow from the hub to the shroud of the impeller, cause the distribution of axial flow velocity at the outlet of the impeller inhomogeneous, and increase the disturbulence of the flow field in impeller region. These phenomena reveal the cavitation characteristics of the axial-flow pump.
Number of references:27
Main heading:Computer simulation
Controlled terms:Axial flow - Cavitation - Impellers - Models - Pumps - Turbulence - Turbulence models - Vapors
Uncontrolled terms:Axial flow pump - Cavitation conditions - Experiment values - Flow direction - Internal cavitation - Leading edge - Multiphase model - Numerical results - Predictive error - Suction side - Turbulent models
Classification code:902.1 Engineering Graphics - 804 Chemical Products Generally - 723.5 Computer Applications - 631.1.1 Liquid Dynamics - 631.1 Fluid Flow, General - 618.2 Pumps - 601.2 Machine Components
DOI:10.3969/j.issn.1002-6819.2012.13.015
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 16>
Accession number:20123515381859
Title:Analysis on temporal and spatial differences of water productivity in irrigation districts in China
Authors:Cao, Xinchun (1); Wu, Pute (1); Wang, Yubao (1); Zhao, Xining (2); Liu, Jing (2)
Author affiliation:(1) College of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University, Yangling 712100, China; (2) Institute of Water Saving Agriculture in Arid Regions of China, Yangling 712100, China; (3) National Engineering Research Center for Water Saving Irrigation at Yangling, Yangling 712100, China; (4) Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China
Corresponding author:Wu, P.(Gjzwpt@vip.sina.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:1-7
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 grain output and generalized water resources input, water productivity and utilization factor of generalized water in irrigation districts of 31 provinces were counted and it's spatial and temporal differences were analyzed. The results showed that water productivity of every province presented an increasing trend, and national average water productivity increased from 0.67 kg/m<sup>3</sup> to 0.81 kg/m<sup>3</sup> from 1998 to 2010. Spatial autocorrelation analysis results showed provinces with resemble water productivity value showed significant aggregation, and Moran's I inspection values were higher than confidence level (0.01). Distributions of provinces with high water productivity value were centered with Huang-Huai-Hai plain, and provinces with lower water productivity values were distributed in South and Northeast China. Local autocorrelation analysis revealed that more than 20 provinces showed high-high positive autocorrelation(HH) and low-low positive autocorrelation(LL), general and regional spatial differentiation characteristics in 1998-2010 was insignificant. Generalized water use coefficient of different province increased, and there were no consistency on relations between water productivity and water use coefficient in different provinces, there were still great water saving potential in provinces with high water productivity value, and reasons of spatial differences for water productivity and generalized water utilization factor were analyzed from natural conditions, agricultural production features, economic development levels, etc. This research provides references for making macro policies of water resources management in irrigation districts.
Number of references:27
Main heading:Water resources
Controlled terms:Autocorrelation - Factor analysis - Grain (agricultural product) - Irrigation - Models - Spatial variables measurement - Water conservation - Water supply
Uncontrolled terms:Agricultural productions - Confidence levels - Economic development - High water - Irrigation districts - Local auto-correlation - Natural conditions - Northeast China - Spatial autocorrelations - Spatial differences - Spatial differentiation - Temporal differences - Utilization factor - Water productivity - Water resources management - Water saving - Water use - Water utilization
Classification code:943.2 Mechanical Variables Measurements - 922.2 Mathematical Statistics - 922 Statistical Methods - 921 Mathematics - 902.1 Engineering Graphics - 821.4 Agricultural Products - 821.3 Agricultural Methods - 446.1 Water Supply Systems - 444 Water Resources
DOI:10.3969/j.issn.1002-6819.2012.13.001
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 17>
Accession number:20123515381888
Title:Recirculating aquaculture system with multi-layer drawer culture tanks for juvenile abalone and its effects
Authors:Wu, Yin (1); Sun, Jianming (2); Chai, Yu (3); Xu, Changlei (2)
Author affiliation:(1) Key Laboratory of Mariculture in North, Ministry of Agriculture, Dalian Ocean University, Dalian 116023, China; (2) Research Center for Facilities Fishery Engineer of Liaoning Province, Dalian Huxin Titanium Equipment Development Limited Company, Dalian 116033, China; (3) Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China
Corresponding author:Sun, J.(sjm@dlhuixin.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:185-190
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 culture efficiency of disk abalone, Haliotis discus hannai, the recirculating aquaculture system (RAS) with multi-layer drawer abalone culture tanks (70 cm×40 cm×10 cm per drawer) were designed. The water quality parameters, energy consumption during experiment period, as well as the growth rate and survival of juvenile abalone in different culture densities were monitored. The results showed that the culture density for 150 individuals per drawer in the recirculating systems was appropriate, which was about 6-9 times of the flow-through systems. The temperature, dissolved oxygen, pH value, salinity, NH<inf>4</inf><sup> </sup>-N and NO<inf>2</inf><sup>-</sup>-N were all maintained within acceptable ranges for the normal growth of disk abalone. The total NH<inf>4</inf><sup> </sup>-N and NO<inf>2</inf><sup>-</sup>-N stabilized around 0.023-0.065 mg/L and 0.014-0.041 mg/L, respectively. The power consumption per day for heating was 1.287 kW·h, where the power consumption for heating sea water accounted for 19.62% of the total power consumption (688.88 kW·h). Compared with conventional flow-through system, it was only one-seventh of energy consumption for heating sea water. The study indicates that it is a kind of mode with the characteristics of safe, high efficiency, energy saving and low pollution for RAS with drawer-type culture tank for disk abalone culture. The results can provide references for choosing abalone culture devices.
Number of references:19
Main heading:Shellfish
Controlled terms:Aquaculture - Energy efficiency - Energy utilization - Growth (materials) - Nitrogen oxides - Tanks (containers) - Water quality
Uncontrolled terms:Culture efficiency - Drawer-type culture tank - Flow-through systems - Haliotis - Low pollution - Normal growth - pH value - Recirculating aquaculture system - Recirculating system - Total power consumption - Water quality parameters
Classification code:821.3 Agricultural Methods - 804.2 Inorganic Compounds - 619.2 Tanks - 951 Materials Science - 525.3 Energy Utilization - 461.9 Biology - 453.2 Water Pollution Control - 525.2 Energy Conservation
DOI:10.3969/j.issn.1002-6819.2012.13.030
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 18>
Accession number:20123515381890
Title:Process of solid-state fermentation of cottonseed meal and its kinetic model
Authors:Wu, Yifei (1); Sun, Hong (1); Yao, Xiaohong (1); Wang, Xin (1); Tang, Jiangwu (1)
Author affiliation:(1) Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Corresponding author:Tang, J.(tangjiangwu@sina.com.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:199-204
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 investigate the changes of the concentrations of free gossypol (FG), crude protein (CP) and acid soluble protein (ASP) in the solid-state fermentation of cottonseed meal by Bacillus subtilis Bs-1, the temperatures, moisture contents, as well as the concentrations of CP, ASP and FG were measured in windrow-type aerobic fermentation. A growth model of Bs-1 was established using the equation of logistic. The kinetic models of cottonseed meal fermentation were built by accessing the correlation between the growth of B. subtilis Bs-1 and the contents of CP, ASP, and FG. Results showed that both temperature and moisture had regular changing trends in the process of fermentation. The concentrations of CP and ASP increased by 9.28% and 46.51%, respectively, whereas the FG content dropped by 42.31% after fermentation. Correlations between Bs-1 number and CP (R<sup>2</sup>=0.831)/ASP (R<sup>2</sup>=0.867) were positive. The Bs-1 population was negatively correlated with FG content (R<sup>2</sup>=0.976). The predicted values of the models agreed well with the experimental values in the verification experiment. The models can be used to predict the fermentation coursed by Bacillus subtilis Bs-1 under industrial-scale solid-state fermentation.
Number of references:28
Main heading:Fermentation
Controlled terms:Enzyme kinetics - Kinetic theory - Kinetics - Models - Oilseeds - Proteins
Uncontrolled terms:Aerobic fermentation - Bacillus Subtilis - Changing trends - Cottonseed meals - Crude proteins - Experimental values - Free gossypol - Growth models - Kinetic models - Solid-state fermentation - Soluble proteins - Subtilis
Classification code:802.2 Chemical Reactions - 804.1 Organic Compounds - 821.4 Agricultural Products - 902.1 Engineering Graphics - 931 Classical Physics; Quantum Theory; Relativity - 931.1 Mechanics
DOI:10.3969/j.issn.1002-6819.2012.13.032
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 19>
Accession number:20123515381878
Title:CH<inf>4</inf> and N<inf>2</inf>O emissions response to controlled irrigation of paddy fields
Authors:Peng, Shizhang (1); Hou, Huijing (1); Xu, Junzeng (1); Yang, Shihong (1); Mao, Zhi (3)
Author affiliation:(1) State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; (2) College of Water Conservancy and Hydropower, Hohai University, Nanjing 210098, China; (3) College of Water Resources and Hydroelectric Engineering, Wuhan University, Wuhan 430072, China
Corresponding author:Hou, H.(houhuijing@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:121-126
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 effects of controlled irrigation on variations of CH<inf>4</inf> and N<inf>2</inf>O emissions from paddy fields, CH<inf>4</inf> and N<inf>2</inf>O emissions from paddy fields under controlled irrigation were investigated by the method of static chamber/gas chromatography. The results showed that CH<inf>4</inf> emissions from controlled irrigation paddy fields were lower than those from traditional irrigation paddy fields during most of the rice growing season. The high CH<inf>4</inf> emissions from controlled irrigation paddy fields were mainly observed during the former tillering period of rice, and the peaks were observed 1-2 days after soil dehydration. Compared with the traditional irrigation paddy fields, cumulative emission of CH<inf>4</inf> from controlled irrigation paddy fields reduced by 81.2%-82.8%. The N<inf>2</inf>O emissions from controlled irrigation paddy fields were mostly higher than those from traditional irrigation paddy fields, and the peaks were observed 3-4 days after soil dehydration. Compared with the traditional irrigation paddy fields, cumulative emission of N<inf>2</inf>O from controlled irrigation fields increased by 121.8%-144.3%. However, the integrative global warming potential of CH<inf>4</inf> and N<inf>2</inf>O on a 100-year horizon was significantly decreased by 15.0%-34.8% in the controlled irrigation paddy fields (p<0.05). These results suggest that controlled irrigation can significantly mitigate the integrative greenhouse effect caused by CH<inf>4</inf> and N<inf>2</inf>O from paddy fields.
Number of references:28
Main heading:Irrigation
Controlled terms:Carbon dioxide - Dehydration - Global warming - Greenhouse effect - Neutron emission - Water conservation
Uncontrolled terms:CH<inf>4</inf> - Global warming potential - Growing season - Paddy fields - Static chambers - Traditional irrigation
Classification code:444 Water Resources - 451 Air Pollution - 802.2 Chemical Reactions - 804.2 Inorganic Compounds - 821.3 Agricultural Methods - 932.1 High Energy Physics
DOI:10.3969/j.issn.1002-6819.2012.13.020
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 20>
Accession number:20123515381865
Title:Finite-element analysis on dynamic contact characteristics of cylindrical roller bearing considering misalignment with journal
Authors:Tong, Baohong (1); Liu, Ying (1); Cheng, Xinming (1); Sun, Xiaoqian (1)
Author affiliation:(1) School of Mechanical Engineering, Anhui University of Technology, Maanshan 243032, China
Corresponding author:Tong, B.(bh_tong@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:42-47
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:Misalignment of shaft journal usually takes place in shaft-bearing system and can not be neglected in the design of bearing. With different slant angles of shaft journal, numerical simulation on dynamic contacting behavior of roller bearings were carried out by using dynamic finite element models based on ANSYS/LS-DYNA. The effect on contact elements from the changing of slant angles was obtained by comparing and analyzing the value of distortion and stress. And dynamic contacting characteristics of a cylindrical roller bearing considering misalignment were investigated here carefully. It found that the maximum value of von mises stress and shear stress on rollers would be much bigger when considering misalignment of shaft journal. In the three cases of that slant angle were 0°, 0.1° and 0.5°, the maximum value of von mises stress on rollers were 700 MPa, 2.73 GPa and 4.0 GPa separately. The value of the stress on end face element and the distribution of the stress on contact position were all changed with the slant angles. While impact on the displacement of the axes along loading from slant angles was very small, and the displacements were all around -0.2-0.3 mm. Conclusions were expected to give some useful references for the study of dynamic contacting characteristics of roller bearing and the optimum designing of bearing structure when considering misalignment.
Number of references:26
Main heading:Alignment
Controlled terms:Bearings (structural) - Contacts (fluid mechanics) - Finite element method - Loading - Roller bearings - Rolling resistance
Uncontrolled terms:Bearing structure - Contact elements - Contact position - Cylindrical roller-bearing - Dynamic contacting - Dynamic contacts - Dynamic finite element model - Maximum values - ON dynamics - Optimum designing - Shaft journal - Shaft-bearing system - Slant angle - Von Mises stress
Classification code:931.1 Mechanics - 921.6 Numerical Methods - 818.5 Rubber Products - 672 Naval Vessels - 601.2 Machine Components - 601.1 Mechanical Devices - 408.2 Structural Members and Shapes
DOI:10.3969/j.issn.1002-6819.2012.13.007
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 21>
Accession number:20123515381862
Title:Reverse design of non-circular gear-crank slider hay baler mechanism
Authors:Lei, Changyi (1); Chen, Jianneng (1); Li, Pengpeng (1); Wang, Ying (1)
Author affiliation:(1) College of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China
Corresponding author:Chen, J.(jiannengchen@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:22-27
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 meet the requirements of the ideal kinematics characteristic, a new non-circular gear-crank slider hay baler mechanism was proposed, the ideal kinematics characteristic of the hay baler was analyzed, and the equation of ideal speed curve was built in this paper. The dynamics model of this new mechanism was built to carry out the reverse design of the pitch curve of non-circular gear that could meet the working requirements for the purpose of getting the ideal speed curve. Compared with the traditional slider crank baler mechanism, through example calculation, compression time of the new mechanism increased by 30% in one working cycle, the new mechanism could compress rapidly in small resistance stage while at a constant low-speed in big resistance stage, and the maximum input power decreased by 28.6%.
Number of references:24
Main heading:Kinematics
Controlled terms:Agricultural machinery - Mechanisms - Reverse engineering
Uncontrolled terms:Crank sliders - Dynamics models - Hay baler - Input power - Kinematics characteristics - New mechanisms - Non-circular - Non-circular gears - Pitch curve - Slider crank - Working cycle
Classification code:601.3 Mechanisms - 723 Computer Software, Data Handling and Applications - 821.1 Agricultural Machinery and Equipment - 931.1 Mechanics
DOI:10.3969/j.issn.1002-6819.2012.13.004
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 22>
Accession number:20123515381875
Title:Parameterization of velocity moment distribution and its effects on performance of mixed-flow pump
Authors:Bing, Hao (1); Cao, Shuliang (1); Tan, Lei (2); Lu, Li (3)
Author affiliation:(1) State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China; (2) State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China; (3) Hydraulic Machinery Department, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Corresponding author:Cao, S.(caoshl@mail.tsinghua.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:100-105
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 parameterize the velocity moment distribution, Parameter a<inf>0</inf>, relative coefficient of the distribution curve of the dimensionless velocity moment along the streamline, and parameter P, curve derivative value in the position of blade trailing edge, were selected to be velocity moment distribution parameters by theoretical analysis. Based on the design platform of iterative calculation of direct and inverse problems of the mixed-flow pump impeller, a series of mixed-flow pump impellers were designed with different combinations of velocity moment distribution parameter values. By solving N-S equation and RNG k-Ε turbulent model equation, the three-dimensional turbulent flow field inside the mixed-flow pump impeller was simulated on the basis of SIMPLEC algorithm. Thus, the relative pressure and the relative velocity distributions were determined and the hydraulic efficiency was estimated. The results show that, velocity moment distribution parameters have direct influences on the blade wrap angle and the trailing edge, which has further effects on the internal relative velocity distribution, the internal relative pressure distribution and flow stability. Reasonable selection of velocity moment parameters can strengthen the control of blade over fluid motion, improve internal pressure distribution of impeller and realize better hydraulic characteristics of the impeller. In addition, the parameterization method of the velocity moment distribution developed in this paper can also be beneficial to setting the velocity moment distribution though the procedure of impeller design of the mixed-flow pump.
Number of references:29
Main heading:Velocity distribution
Controlled terms:Impellers - Inverse problems - Navier Stokes equations - Parameterization - Pressure distribution - Pumps - Three dimensional - Velocity
Uncontrolled terms:Design platform - Dimensionless velocity - Distribution curves - Flow stability - Fluid motions - Hydraulic characteristic - Hydraulic efficiency - Impeller design - Iterative calculation - Mixed flow pump - Mixed-flow pump impellers - Moment distribution - Moment parameters - N-S equations - Parameterization method - Performance prediction - Relative coefficients - SIMPLEC algorithm - Three-dimensional turbulent flow - Trailing edges - Turbulent models
Classification code:601.2 Machine Components - 618.2 Pumps - 902.1 Engineering Graphics - 921 Mathematics - 931.1 Mechanics - 931.3 Atomic and Molecular Physics
DOI:10.3969/j.issn.1002-6819.2012.13.017
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 23>
Accession number:20123515381879
Title:Simulation of potential nitrate leaching in croplands of typical watershed around Bohai Bay using DNDC model
Authors:Li, Hu (1); Qiu, Jianjun (1); Gao, Chunyu (1); Wang, Ligang (1)
Author affiliation:(1) Key Laboratory of Non-Point Source Pollution Controlling of Ministry of Agriculture, Beijing 100081, China; (2) Institute of Natural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Corresponding author:Qiu, J.(Qiujj@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:127-134
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:Nitrogen (N) leaching from agricultural systems plays a key role in the water contamination. Quantifying potential nitrogen leaching at watershed scale is important for providing mitigation policies or strategies. Taking the typical small watershed-Xiaoqinghe basin around Bohai Bay as an example, this paper selected the denitrification-decomposition model (DNDC), combined with detailed soil hydrological and biogeochemical processes, to predict nitrogen leaching of croplands in the watershed under the support of GIS database. The results showed that simulations of the DNDC model was reasonable and had good agreement with observations of annual amounts of leached water and rates of nitrate leaching from 3 typical cropping systems in Xiaoqing River basin. According to the tested DNDC model, the potential N leaching loads ranged from 10.44×10<sup>3</sup> to 36.86×10<sup>3</sup>t, with an average of 23.65×10<sup>3</sup>t in the watershed in 2006. Taking the amount of total N fertilizer applied 222.2×10<sup>3</sup>t in that year, the average N leaching accounted for 10.6% of the total N fertilizer input. The spatial distribution of N leaching among all the towns in the watershed varied greatly due to the differences in climatic conditions, soil properties, as well as farm management practices, which was similar to the distribution of the fertilizer application rate. The amount of N leaching in most regions mainly varied in a range of 20-80 kg/hm<sup>-2</sup>. These regions mainly distributed along the Xiaoqing River and Shouguang city. The study also concluded that it is necessary to reduce potential N leaching rates according the practical conditions in different regions of the watershed.
Number of references:23
Main heading:Leaching
Controlled terms:Computer simulation - Fertilizers - Geologic models - Landforms - Models - Nitrogen - Watersheds
Uncontrolled terms:Agricultural system - Biogeochemical process - Bohai Bay - Climatic conditions - Croplands - Cropping systems - Farm management - Fertilizer applications - GIS-database - Leached water - Leaching rates - Mitigation policies - N fertilizers - Nitrate leaching - Nitrogen leaching - River basins - Small watersheds - Soil property - Water contamination - Watershed scale
Classification code:444.1 Surface Water - 481.1 Geology - 533.1 Ore Treatment - 723.5 Computer Applications - 804 Chemical Products Generally - 902.1 Engineering Graphics
DOI:10.3969/j.issn.1002-6819.2012.13.021
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 24>
Accession number:20123515381889
Title:Solar oxygenation system for aquaculture and running effect
Authors:You, Guodong (1); Yang, Shifeng (1); Li, Jisheng (1); Hou, Yong (1); Wang, Xiuqing (1); Nan, Zhongliang (1); Wang, Chang (1)
Author affiliation:(1) College of Electronic Information and Automation, Tianjin University of Science and Technology, Tianjin 300222, China
Corresponding author:You, G.(yougdong1973@sohu.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:191-198
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 rapidly improve aquiculture water quality, the existing circumstances and problems of water eutrophication in our country was analysed in this paper, and a water oxygenation system powered with solar battery was developed. The system is controlled by singlechip microcomputer, and the structure features, hardware and software implementation methods of the system were introduced in detail. The system has been applied in the purification of park fishpond and aquiculture of carp. The results showed that the system realized real-time control for the dissolved oxygen and pH of a fishpond, and make more environmental factors keep in the best value ranges. The study can provide a new achievable technical measure for enhancing the water self cleaning capacity and aquaculture level.
Number of references:38
Main heading:Biochemical oxygen demand
Controlled terms:Aquaculture - Dissolved oxygen - Electric batteries - Energy conservation - Eutrophication - Oxygenation - Oxygenators - Real time control - Solar energy - Thermoelectricity - Water quality
Uncontrolled terms:Aquiculture - Best value - Environmental factors - Hardware and software implementations - Increasing oxygen system - Oxygenation systems - Self cleaning - Single chip microcomputers - Structure features - Technical measures - Water eutrophication
Classification code:821.3 Agricultural Methods - 615.2 Solar Power - 615.4 Thermoelectric Energy - 702.1 Electric Batteries - 731 Automatic Control Principles and Applications - 732 Control Devices - 803 Chemical Agents and Basic Industrial Chemicals - 525.2 Energy Conservation - 453.2 Water Pollution Control - 453 Water Pollution - 445.2 Water Analysis - 445 Water Treatment - 444 Water Resources - 462.2 Hospitals, Equipment and Supplies
DOI:10.3969/j.issn.1002-6819.2012.13.031
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 25>
Accession number:20123515381894
Title:Research on permissive conversion limit of dryland to paddy field in Tonghe county, Heilongjiang province
Authors:Xiang, Changyu (1); Zhou, Dongxing (1); Song, Ge (1); Zhao, Yinghui (1)
Author affiliation:(1) College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
Corresponding author:Zhou, D.(zhboshi@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:226-230
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:It is prominent phenomenon of the conversion of dryland to paddy in the conditional areas because of high benefit on rice cultivation. The areas where the paddy field grows rapidly can lead to the contradiction between human and land. How to determine the maximum area of paddy field and to guarantee the harmonious development between human and land is a urgent problem to be solved. Based on the technology of GIS, taking Tonghe county, Heilogjiang province as research area, considering the nature constraints of the agricultural ecological bearing capacity, this paper calculated the maximum paddy area of permission in Tonghe county by quantified model. The results showed that the permission conversion degree should be controlled less than 0.45, that is, the paddy field area should be controlled within 79311.8 hm<sup>2</sup>. This limit can guarantee the harmonious development between human and land in Tonghe county. Based on the agricultural circumstances of 2008, the area of dryland converting to paddy field in Tonghe county is about 20000 hm<sup>2</sup> in the future and there is a big potential of dry land to paddy field. The research can provide a quantitative basis for agricultural planting structure adjustment in Tonghe county, Heilongjiang province and ensure the sustainable development of agriculture in Tonghe county and the similar regions.
Number of references:20
Main heading:Cultivation
Controlled terms:Agriculture - Planning - Research - Sustainable development - Water resources
Uncontrolled terms:Dryland - Harmonious development - Paddy fields - Permissive conversion limit - Rice cultivation - Urgent problems
Classification code:403 Urban and Regional Planning and Development - 444 Water Resources - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.3 Agricultural Methods - 901.3 Engineering Research - 901.4 Impact of Technology on Society
DOI:10.3969/j.issn.1002-6819.2012.13.036
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 26>
Accession number:20123515381869
Title:NO<inf>x</inf> conversion of diesel engine with non-thermal plasma assisted nano-catalyst
Authors:Cai, Yixi (1); Lei, Lili (1); Wang, Pan (1); Zheng, Rongyao (1); Yan, Yazhou (1)
Author affiliation:(1) School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Lei, L.(yutian820817@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:67-71
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 non-thermal plasma assisted catalyst (NPAC) reactor was designed, and La<inf>0.8</inf>K<inf>0.2</inf>Mn<inf>0.5</inf> Co<inf>0.5</inf>O<inf>3</inf> nano- catalyst was prepared by the means of citrate-gel method. The bench test was carried out to investigate the effects of NTP special energy density and temperature on NO<inf>x</inf> reduction with NPAC system. Results showed that the concentration of O<inf>2</inf> was reduced significantly compared with the reference test under different frequencies of NTP discharge, and the maximum reduction was to 5.17%. The concentration of NO<inf>2</inf> was increased and the concentration of NO was reduced with the increase of NTP specific energy density. NO<inf>2</inf> and NO began to transform when the specific energy density exceeded 80J/L under the frequency of 14.0 kHz. The catalytic activity of La<inf>0.8</inf>K<inf>0.2</inf>Mn<inf>0.5</inf> Co<inf>0.5</inf>O<inf>3</inf> catalyst<inf> </inf>began to appear in the temperature range of 280-350°C, and the concentration of NO<inf>x</inf> was reduced effectively under the treatment of NPAC system.
Number of references:25
Main heading:Reduction
Controlled terms:Catalysts - Diesel engines - Exhaust gases - Experiments - Manganese - Nitrogen oxides
Uncontrolled terms:Bench tests - Citrate gel method - Different frequency - Nano-catalyst - Nonthermal plasma - Special energy - Specific energy density - Temperature range
Classification code:804.2 Inorganic Compounds - 804 Chemical Products Generally - 803 Chemical Agents and Basic Industrial Chemicals - 901.3 Engineering Research - 802.2 Chemical Reactions - 612.1 Internal Combustion Engines, General - 543.2 Manganese and Alloys - 612.2 Diesel Engines
DOI:10.3969/j.issn.1002-6819.2012.13.011
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 27>
Accession number:20123515381882
Title:Lettuce image target clustering segmentation based on MFICSC algorithm
Authors:Sun, Jun (1); Wu, Xiaohong (1); Zhang, Xiaodong (2); Wang, Yan (1); Gao, Hongyan (2)
Author affiliation:(1) School of Electrical and Information Engineering of Jiangsu University, Zhenjiang 212013, China; (2) Jiangsu Provincial Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Sun, J.(sun2000jun@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:149-153
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:Lettuce image target segmentation is the premise of the nondestructive detection of lettuce physiological information based on image processing. Because lettuce contains more water, the camera len is likely to occur reflex, leading to uneven gray distribution of lettuce leaf image. A modified image equalization algorithm is used to equalize the image gray. In this paper, the mixed fuzzy inter-cluster separation clustering(MFICSC) is applied in lettuce image target segmentation, which can make the distance between classes be maximum on the whole and can produce the fuzzy memberships and possibilities simultaneously. MFICSC can overcome the noise sensitivity and the coincident clusters problem. In the test, the MFICSC algorithm and Otsu algorithm were applied to lettuce image target segmentation respectively. The test results show that the MFICSC algorithm has better clustering accuracy, and its segmentation effect is superior to the one of traditional Otsu algorithm.
Number of references:26
Main heading:Clustering algorithms
Controlled terms:Algorithms - Computer vision - Image segmentation
Uncontrolled terms:Clustering accuracy - Clustering segmentation - Fuzzy membership - Gray distribution - Image equalization - Image grays - Leaf images - MFICSC - Noise sensitivity - Nondestructive detection - Otsu - Otsu algorithm - Target segmentation
Classification code:721 Computer Circuits and Logic Elements - 723 Computer Software, Data Handling and Applications - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.13.024
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 28>
Accession number:20123515381883
Title:Multi-instance graph approach to wheat leaf disease segmentation
Authors:Hu, Xiaohong (1); Li, Bingjun (2); Xi, Lei (2)
Author affiliation:(1) Economics and Management College, Henan Agricultural University, Zhengzhou, 450002, China; (2) School of Information and Management Science, Henan Agricultural University, Zhengzhou, 450002, China
Corresponding author:Li, B.(zzlbjun@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:154-159
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:Image segmentation is one of the difficult issues in crop disease recognition. Traditional methods based on threshold or clustering are mostly used in present research, but the precision is low. A multi-instance graph model was proposed in this paper to improve the segmentation performance of crop disease. The image segmentation was formulated as a graph segmentation problem under multi-instance learning framework, where the neighborhood information of pixels was fused to build the feature space and the adaptive geometric relationship between two packages of instances was introduced to wheat leaf disease segmentation, which was combined with the global and local features and had better measurement of interior difference and exterior difference. The experimental results show that this approach outperforms other methods and is effective for wheat leaf disease segmentation.
Number of references:27
Main heading:Image segmentation
Controlled terms:Computer vision - Crops - Diseases
Uncontrolled terms:Crop disease - Feature space - Geometric relationships - Graph model - Graph segmentation - Leaf disease - Local feature - Multi-instance learning - Neighborhood information - Recognition - Segmentation performance
Classification code:461.7 Health Care - 723.5 Computer Applications - 741.1 Light/Optics - 821.4 Agricultural Products
DOI:10.3969/j.issn.1002-6819.2012.13.025
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 29>
Accession number:20123515381897
Title:Theoretical analysis and experimental verification on influencing factors of obliquity of eggs on conveyor supporting rollers
Authors:Jiang, Song (1); Jiang, Xiaofeng (1); Chen, Zhangyao (2); Shi, Xiaoyan (1); Qi, Hong (1); Jiang, Gaofeng (1); Lü, Riqin (1); Zhu, Ting (1); Jiang, Yuxiang (1)
Author affiliation:(1) School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; (2) Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Jiang, S.(jszhl@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:244-250
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 illustrate the mechanism of axial motion of eggs on the conveyor supporting rollers, the principles of dynamics and geometry were employed, and obliquity variations of the major axis of eggs on a plane and two parallel rollers with equivalent diameter, as well as the impact of different diameter and center distance on the obliquity were studied theoretically and experimentally. It was revealed that there exists a sole balance-contact-circle to which an egg was analogously as the balance of the homogenous egg-shaped body was put on a plane or two parallel consistent supporting rollers. The obliquity calculation method of balance-contact-circle under different support conditions and the relations between the obliquity and the support pattern as well as the construction parameters were established. It was found that the obliquity of homogeneous egg-shaped body or eggs balanced on plane was smaller than that on two parallel supporting rollers. Concerning the latter, the obliquity was negatively correlated with the diameter (25-50 mm) of supporting rollers, and positively correlated with the center distance (47-67 mm). With support conditions constant, obliquity was dependent on the basic characteristic parameters such as the size of eggs, major axial diameter, minor axial diameter, mass and the volume. The experimental results show that the application of balance-contact-circle in the analyses of obliquities under different support conditions is accurate and feasible, which can provide a basis for analyzing the axial motion of eggs on the conveyor supporting rollers.
Number of references:15
Main heading:Rollers (machine components)
Controlled terms:Balancing - Catalyst supports - Conveyors - Factor analysis - Mechanisms
Uncontrolled terms:A-plane - Axial motions - Center distance - Characteristic parameter - Construction parameter - Egg-shaped body - Eggs - Equivalent diameter - Experimental verification - Influencing factor - Major axis - Obliquity - Support conditions - Support patterns
Classification code:601 Mechanical Design - 692.1 Conveyors - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 922.2 Mathematical Statistics
DOI:10.3969/j.issn.1002-6819.2012.13.039
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 30>
Accession number:20123515381874
Title:Effect of shapes of blade leading edge on hydraulic performance of Kaplan turbine
Authors:Zhao, Yaping (1); Liao, Weili (1); Li, Zhihua (2); Ruan, Hui (1); Luo, Xingqi (1)
Author affiliation:(1) Institute of Water Resources and Hydro-electric Engineering, Xi'an University of Technology, Xi'an 710048, China; (2) Xi'an Thermal Power Research Institute Co., Ltd, Xi'an 710032, China
Corresponding author:Zhao, Y.(zyp0168@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:94-99
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 a Kaplan turbine, the difference of blade geometry may impact the operating performance and operating range of the turbine. Therefore, the relationship between the different shapes of blade leading edge and the turbine performance parameters was studied in this paper. Based on the same blade setting angle, a numerical simulation for the model Kaplan turbine was conducted under the situation of three types of blade leading edge shapes. The results showed that: at the condition of the same blade setting angle, the different blade leading edge shapes could regulate the flow rates and change the distribution of circular rector in the flow passage. It is also helpful to improve the pressure distribution on pressure and suction sides of the blade and to decrease the low pressure area in the runner; these will improve the efficiency and cavitation performance, the different leading edge shape of the blade may adjust the operation scope. This study can provide a theoretical guidance to the optimal design of the turbine.
Number of references:28
Main heading:Turbomachine blades
Controlled terms:Cavitation - Efficiency - Hydraulic motors - Kaplan turbines
Uncontrolled terms:Blade geometry - Cavitation performance - Different shapes - Flow passage - Hydraulic performance - Leading edge - Low-pressure area - Operating performance - Operating ranges - Operation scope - Optimal design - Suction side - Turbine performance
Classification code:617.1 Hydraulic Turbines - 631.1.1 Liquid Dynamics - 632.2 Hydraulic Equipment and Machinery - 913.1 Production Engineering
DOI:10.3969/j.issn.1002-6819.2012.13.016
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 31>
Accession number:20123515381887
Title:Estimation of greenhouse gas emissions from dairy farming systems based on LCA
Authors:Wang, Xiaoqin (1); Liang, Dongli (1); Wang, Xudong (1); Peng, Sha (3); Zheng, Jinzheng (1)
Author affiliation:(1) College of Resources and Environment, Northwest Agriculture and Forestry University, Yangling, 712100, China; (2) Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, China; (3) College of Veterinary Medicine, Northwest Agriculture and Forestry University, Yangling, 712100, China
Corresponding author:Wang, X.(whxq123@hotmail.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:179-184
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 find the effective mitigation means and lead dairy farming systems to low-carbon development, it is important to estimate greenhouse gas (GHG) emissions from dairy farming systems accurately. The paper developed an methodology to estimate the GHG emissions from dairy farming systems based on the life cycle assessment (LCA), combined with the specific situation of China's dairy farming systems, and the method was applied to estimate GHG emissions of a typical large-scale dairy farming system at the suburb in Xi'an city. The results showed that the large emission sources were enteric fermentation, feed production and processing, waste storage, accounting for 48.86%, 18.97% and 16.39% of the total emissions, respectively. The main compositions of greenhouse gas were CH<inf>4</inf>, N<inf>2</inf>O, accounting for 55.56% and 26.9% of the entire system. The emission per kg of raw milk corrected by protein and fat (FPCM) was 1.52 kg CO<inf>2</inf>-eq, which is lower than the average global emissions from mixed feeding systems, but higher than that of the European countries. So, there was big potential possibility to mitigate emissions. Emissions from individual sources could be reduced by improving the feed, manure management, field management and other measures, but the contribution to emission reduction of the entire system should be evaluated based on LCA. It is suggested to evaluate mitigation measures based on LCA to obtain the more effective emission reduction measures for the system.
Number of references:30
Main heading:Greenhouse gases
Controlled terms:Carbon dioxide - Dairies - Emission control - Estimation - Gas emissions - Life cycle - Manures
Uncontrolled terms:Dairy farming - Emission reduction - Emission sources - Energy - Enteric fermentation - Entire system - European Countries - Feeding system - Field management - GHG emission - Global emissions - Life Cycle Assessment (LCA) - Low-carbon - Manure management - Mitigation measures - Raw milk - Total emissions - Waste storage
Classification code:921 Mathematics - 913.1 Production Engineering - 804.2 Inorganic Compounds - 452.3 Industrial Wastes - 451.2 Air Pollution Control - 451.1 Air Pollution Sources - 402.1 Industrial and Agricultural Buildings
DOI:10.3969/j.issn.1002-6819.2012.13.029
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 32>
Accession number:20123515381885
Title:Global crop growth condition monitoring and yield trend prediction with remote sensing
Authors:Qian, Yonglan (1); Hou, Yingyu (1); Yan, Hao (1); Mao, Liuxi (1); Wu, Menxin (1); He, Yanbo (1)
Author affiliation:(1) National Meteorological Center, Beijing 100081, China
Corresponding author:Qian, Y.(qianyl@cma.gov.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:166-171
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:Remote sensing can be used for crop growth condition monitoring and yield prediction at global scale. Meteorological model and agricultural model are both deficient without adequate ground observations, but remote sensing model can give more accurate and perfect results. This paper did a case study on the method for maize growth condition monitoring and yield trend prediction in American based on SPOT-VGT data, as well as rice in India. The study suggests that SPOT-VGT/NDVI and SPOT-VGT/EVI with the spatial resolution of 1 km can both be used for operational global crop growth monitoring and yield prediction. The method for yield trend prediction can give the accuracy as high as 100%. In the most luxuriant period SPOT-VGT/EVI can give more exact information of crop growth condition than SPOT-VGT/NDVI.
Number of references:27
Main heading:Forecasting
Controlled terms:Condition monitoring - Crops - Monitoring - Remote sensing
Uncontrolled terms:Crop growth - Crop growth condition - EVI - Global scale - Ground observations - Growth conditions - Meteorological models - NDVI - Remote sensing models - Spatial resolution - Yield prediction - Yield trends
Classification code:944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 941 Acoustical and Optical Measuring Instruments - 921 Mathematics - 821.4 Agricultural Products - 731.1 Control Systems - 706 Electric Transmission and Distribution - 603 Machine Tools
DOI:10.3969/j.issn.1002-6819.2012.13.027
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 33>
Accession number:20123515381904
Title:Effects of spraying Harpin protein on postharvest fruit quality of Dongzao jujube in growth period
Authors:Li, Ming (1); Yu, Mingli (1); Zhang, Zhuqi (1); Liu, Zhigang (1); Wu, Yichun (1); Wang, Jinsheng (2)
Author affiliation:(1) Key Laboratory of Agricultural and Biological Engineering of Binzhou City, Binzhou Polytechnic, Binzhou 256603, China; (2) Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Corresponding author:Li, M.(liming@bzpt.edu.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:287-292
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 fruit quality of Dongzao jujube in growth period, the effects of spraying Harpin<inf>Xoo</inf> protein on fruit quality of Dongzao jujube tree in growth period were investigated. The experimental results indicated that spraying Harpin<inf>Xoo</inf> protein can significantly increase the fruit weight, hardness, sugar-acid ratio, total sugar and vitamin C content, and reduce the rate of wound and diseases fruit. Compared to the control fruits sprayed with water, the fruit weight and hardness of the treatment fruits sprayed with Harpin<inf>Xoo</inf> protein were increased by over 18.99% and 20.26%, the rate of wound and diseases fruit reduced by 59.67%. In early October, the sugar-acid ratio, total sugar and vitamin C content of the treatment fruits sprayed with Harpin<inf>Xoo</inf> protein reached to 83.15, 33.26% and 4.76 mg/g, respectively, while those of the control fruits sprayed water were only 48.36, 20.31% and 3.41 mg/g, respectively. The fruit shape index, edible rate, moisture content and total acid content of the treatment fruits sprayed with Harpin<inf>Xoo</inf> protein were well maintained. The appearance and taste quality of fruit were significantly improved by spraying Harpin<inf>Xoo</inf> protein on Dongzao jujube tree in growth period. The suitable application concentration of Harpin<inf>Xoo </inf>protein is 20 μg/mL. The research can provide a reference for improving the fruit quality of the Dongzao jujube in growth period.
Number of references:26
Main heading:Fruits
Controlled terms:Disease control - Forestry - Hardness - Proteins - Quality control - Spraying - Sugars - Vitamins
Uncontrolled terms:Acid content - Appearance - Dongzao jujube - Fruit quality - Fruit shape - Fruit weight - Growth period - Postharvest - Taste quality - Vitamin C
Classification code:913.3 Quality Assurance and Control - 821.4 Agricultural Products - 821.0 Woodlands and Forestry - 951 Materials Science - 813.1 Coating Techniques - 461.7 Health Care - 421 Strength of Building Materials; Mechanical Properties - 804.1 Organic Compounds
DOI:10.3969/j.issn.1002-6819.2012.13.046
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 34>
Accession number:20123515381881
Title:Numerical simulation and control mode of soil water and salt movement in arid salinization region
Authors:Wang, Shuixian (1); Dong, Xinguang (2); Wu, Bin (3); Yang, Pengnian (3)
Author affiliation:(1) College of Earth and Environmental Sciences, LanZhou University, LanZhou 730000, China; (2) Xinjiang Institute of Water Conservancy, Urumqi 830006, China; (3) College of Water Conservancy and Civil Engineering, Xinjiang Agriculture University, Urumqi 830052, China
Corresponding author:Wang, S.(wangshuixian@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:142-148
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 arid oases irrigation areas, soil secondary salination is one of the main problems leading to land desertification, so as to imperil the soil quality, growing of crops and agricultural production, even leading to abandonment of agricultural soils. Most salinization processes of salt accumulation in irrigated lands are largely determined by the salinity of the irrigation water and the groundwater level in the areas. So it is very crucial to control groundwater and slat for agricultural development. In this study, a two-dimensional numerical model for the soil water and salt movement was constructed, and it was calibrated and experimentally validated using data from long irrigation experiments in Yanqi basin during April 15th to December 30th in 2010 with total up to 260 days. Acceptable agreement between the model simulations and the observed data was achieved. The results show that the model is creditable. Taking wheat as an example, and considering crop's water requirement and soil salinity change, the practical irrigation program and irrigation water quantity were worked out. Based on the optimized irrigation program and irrigation water quantity, the reasonable controlled depth for groundwater and salinity regulation was determined that taking the different groundwater depths as macro-control criterion. The research can provide a theory basis for rational utilization of water resources and water-salt regulation in arid regions.
Number of references:16
Main heading:Irrigation
Controlled terms:Arid regions - Climatology - Computer simulation - Crops - Groundwater - Macros - Moisture - Numerical analysis - Runoff - Salinity measurement - Soil moisture - Soils - Water resources - Water supply
Uncontrolled terms:Agricultural development - Agricultural productions - Agricultural soils - Arid salinization region - Control modes - Irrigated lands - Irrigation area - Irrigation waters - Land desertification - Model simulation - Observed data - Salination - Salinization process - Soil quality - Soil salinity - Soil water - Two dimensional numerical models - Water requirements - Yanqi basin
Classification code:821.4 Agricultural Products - 821.3 Agricultural Methods - 723.5 Computer Applications - 723.1 Computer Programming - 921.6 Numerical Methods - 483.1 Soils and Soil Mechanics - 444 Water Resources - 443.1 Atmospheric Properties - 443 Meteorology - 446.1 Water Supply Systems
DOI:10.3969/j.issn.1002-6819.2012.13.023
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 35>
Accession number:20123515381864
Title:Simulation of all-wheel steering for three-axle vehicle based on fuzzy control
Authors:Li, Huashi (1); Han, Baoling (1); Luo, Qingsheng (2); Wang, Shufeng (3)
Author affiliation:(1) School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China; (2) School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China; (3) School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255049, China
Corresponding author:Li, H.(lifen.498@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:34-41
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 enhance the stability of three-axle vehicle in limited driving conditions, a nonlinear 2 DOF model of three-axle vehicle with all-wheel steering was established by considering the nonlinear characteristics and the vertical load transfer of tires during vehicle steering. Taking zero side-slip angle of mass center as target and using the control method of feed-forward and state feedback, a fuzzy control system of all-wheel steering was designed based on fuzzy control theory. Finally, simulation model of the control system was built by using MATLAB/Simulink software, and the performance of the control system was tested by carrying out various simulations in limited driving conditions. The simulation results show that the fuzzy control method of all-wheel steering can guarantee that the mass-center side-slip angle of three-axle vehicle is basically zero, and the yaw rate and lateral acceleration become stable quickly. In conclusion, the fuzzy control method can effectively avoid the instability of three-axle vehicle in critical steering conditions and improve the initiative security of vehicle significantly.
Number of references:27
Main heading:Steering
Controlled terms:Automobile steering equipment - Computer simulation - Control systems - Drive axles - Fuzzy control - Software testing - State feedback - Vehicles
Uncontrolled terms:All-wheel steering - Control methods - Driving conditions - Feed-Forward - Lateral acceleration - Mass centers - Matlab/Simulink software - Non-linear model - Nonlinear characteristics - Sideslip angles - Simulation analysis - Simulation model - Vertical load - Yaw rate
Classification code:432 Highway Transportation - 663.2 Heavy Duty Motor Vehicle Components - 723.5 Computer Applications - 731 Automatic Control Principles and Applications - 731.1 Control Systems - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.13.006
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 36>
Accession number:20123515381902
Title:Evolution of pore structure and fractal characteristics of rice husk char particles during gasification
Authors:Fu, Peng (1); Hu, Song (1); Xiang, Jun (1); Sun, Lushi (1); Bai, Xueyuan (2)
Author affiliation:(1) State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China; (2) School of Agricultural and Food Engineering, Shandong University of Technology, Zibo 430074, China
Corresponding author:Hu, S.(hssh30@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:276-281
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 changes in pore structure and fractal characteristics of rice husk char particles during gasification were studied by N<inf>2</inf> physisorption method and scanning electronic microscopy (SEM). The results showed that the adsorption isotherms of rice husk gasified chars were all type II isotherms with hysteresis loops, indicating that the chars consisted of continuous and complete system of pores. As the gasification conversion rate increased, the BET surface area and micropore area first increased to reach the maxima of 210.45 and 147.14 m<sup>2</sup>/g at the conversion of 48.6% and then decreased. Pore volume showed a similar tendency to BET surface area. The average pore diameter decreased significantly and then increased slowly with increase of gasification conversion rate and reached the minimum of 2.94 nm at the conversion rate of 35.4%. The fractal Frenkel-Halsey-Hill (FHH) model was capable of predicting the pore surface fractal characteristics of the gasified char particles. The evolution of pore surface fractal dimension (D<inf>s</inf>) was opposite to that of average pore diameter (d<inf>ave</inf>). There was a good linear relationship between D<inf>s</inf> and d<inf>ave</inf>. The results can provide valuable information for the numerical simulation and the optimization of operating parameters of the actual biomass gasification process.
Number of references:26
Main heading:Gasification
Controlled terms:Biomass - Fractal dimension - Fractals - Physisorption - Pore structure
Uncontrolled terms:BET surface area - Biomass Gasification - Char particles - Complete system - Conversion rates - Fractal characteristics - Linear relationships - Micropores - Operating parameters - Pore diameters - Pore surface - Pore volume - Rice husk - Scanning electronic microscopy - Type II
Classification code:525.1 Energy Resources and Renewable Energy Issues - 802.3 Chemical Operations - 921 Mathematics - 931.2 Physical Properties of Gases, Liquids and Solids
DOI:10.3969/j.issn.1002-6819.2012.13.044
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 37>
Accession number:20123515381895
Title:Numerical simulation on temperature field effect of stack method of garden stuff for fresh-keeping transportation
Authors:Guo, Jiaming (1); Lü, Enli (1); Lu, Huazhong (1); Zhong, Dongxia (1); Yang, Songxia (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 510640, China
Corresponding author:Lü, E.(enlilv@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:231-236
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:Temperature field is one of the factors to guarantee the quality of cargoes under fresh-keeping transportation. In order to investigate the temperature field distributions, the differential pressure experimental container with banana cargoes units was used as the research object, a 3d numerical calculated model of 1/4 dimension of the car body was built by using the porous model, SIMPLE algorithm and wall function method to simulated the three kinds of garden stuff stack methods, including the "blanks on both two sides and middle", "blanks on both sides" and "full load". The cloud charts of the temperature distributions on the symmetry sections in the container and on the surface of cargoes were obtained. Comparative analyses show that rational stack method can improve the distribution of temperature field and under "blanks on both two sides and middle" stack method, the heat exchange of the cold air and goods is better, and the temperature field ahead of container is more uniform compared to the "blanks on both sides" and "full load". Experimental results meet the simulation results well, where the deviation between simulation temperature and the average of test values is no more than 1.5°C. This study reveals the general rules of the temperature field in fresh-keeping transportation with controlled atmosphere, which can provide a reference for the optimization design and selection of reasonable stack methods in fresh-keeping transportation.
Number of references:21
Main heading:Distribution of goods
Controlled terms:Computer simulation - Containers - Models - Numerical methods - Temperature - Three dimensional computer graphics - Transportation
Uncontrolled terms:Car bodies - Cold air - Comparative analysis - Differential pressures - Distribution of temperature - Fresh-keeping - Full-load - Heat exchange - Numerical calculated - Optimization design - Porous model - Research object - SIMPLE algorithm - Simulation temperature - Stack method of Garden Stuff - Temperature field distribution - Wall function method
Classification code:921.6 Numerical Methods - 902.1 Engineering Graphics - 723.5 Computer Applications - 691 Bulk Handling and Unit Loads - 641.1 Thermodynamics - 434 Waterway Transportation - 433 Railroad Transportation - 432 Highway Transportation - 431 Air Transportation
DOI:10.3969/j.issn.1002-6819.2012.13.037
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 38>
Accession number:20123515381896
Title:Optimization of temperature regulating performance in fresh-keeping transportation by liquid nitrogen injection
Authors:Lü, Enli (1); Yang, Zhou (1); Lu, Huazhong (1); Wang, Guanghai (3); Guo, Jiaming (2); Xu, Jinfeng (2)
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 510640, China; (3) Guangdong Jidian Polytechnic, Guangzhou 510515, China
Corresponding author:Yang, Z.(yangzhou@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:237-243
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:An experimental platform with atmosphere controlled system by liquid nitrogen injection was established to study and solve the cold damage problem caused by liquid nitrogen during the transportation. The bore diameter of the outlet valve on the liquid nitrogen tank, the length of the vaporization coiled pile, the aperture direction on the horizontal pile, the ratio of opening area on the perforated partition, the airflow velocity and the length of the air return channel were chosen as variables to analyze their effects on the temperature regulating characteristics of liquid nitrogen and the parameters were optimized. The best regulation performance was obtained under the condition with the bore diameter of the outlet at 1.5 mm, the length of the vaporization coiled pile at 4 m, the aperture direction on the horizontal pile towards the draught fan, the ratio of the opening area on the partition at 4.03%, the airflow velocity at 8 m/s, and the length of the air return channel at 1.5 m. Under this condition, the O<inf>2</inf> concentration was reduced from 20.95% to 5%, the maximum temperature difference among the outlets of the perforated partition was only 1.3°C, and the maximum temperature difference between the outlet of perforated partition and the air return channel was only 2.72°C. The liquefied-nitrogen atmosphere controlled system could rapidly reduce the oxygen concentration in the container from 20.95% to 5% in 43 min, while cooling the internal environment of the container. The results can provide valuable references for the design of fresh-keeping vehicle with controlled atmosphere system.
Number of references:23
Main heading:Piles
Controlled terms:Air - Liquid nitrogen - Optimization - Protective atmospheres - Temperature - Transportation - Vaporization - Vapors
Uncontrolled terms:Air flow velocity - Controlled atmosphere systems - Controlled system - Experimental platform - Fresh-keeping - Maximum temperature - Nitrogen injection - Opening areas - Outlet valve - Oxygen concentrations - Return channels
Classification code:804.2 Inorganic Compounds - 804 Chemical Products Generally - 802.3 Chemical Operations - 641.1 Thermodynamics - 921.5 Optimization Techniques - 434 Waterway Transportation - 432 Highway Transportation - 431 Air Transportation - 408.2 Structural Members and Shapes - 433 Railroad Transportation
DOI:10.3969/j.issn.1002-6819.2012.13.038
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 39>
Accession number:20123515381901
Title:Preparation technology and parameters optimization for soybean straw fiber as biodegradable film material
Authors:Li, Lixia (1); Chen, Haitao (1)
Author affiliation:(1) College of Engineering, Northeast Agricultural University, Harbin 150030, China
Corresponding author:Chen, H.(haitao1963@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:269-275
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 environmental pollution caused by straw burning and plastic film, straw resources should be utilized with high value. The method of the central composite rotatable quadratic orthogonal experimental design was applied to explore the possibility for preparing soybean straw fiber as clean, high strength and high yield raw material for biodegradable film with physical method. The effects of material characteristics and operating parameters on soybean straw fiber properties and optimal parameters combination were studied. Soybean stalk length, soak time, operation temperature, spindle speed and feeding rate were selected as influence factors. Fiber yield, fiber aspect ratio and tensile strength were selected as response functions. The Design-expert 6.0.10 software was applied to design the scheme and analyze the data. The results showed that 1) with the parameters of straw length 7 cm, soaking time 24 h, feeding rate 27 g/min, operation temperature 80~85°C and spindle speed 110~120 r/min, the fiber yield was over 80%, dry tensile strength was over 7 N, aspect ratio was over 5. 2) The order of contribution rate of all the factors on fiber yield was: soak time>spindle speed>feed rate>stalk length> operation temperature; The order of contribution rate of all the factors on tensile strength was: stalk length> operation temperature> feed rate>soak time>spindle speed; The order of contribution rate of all the factors on fiber aspect ratio was: feeding rate>stalk length>operation temperature>soak time>spindle speed. The research can provide a theoretical and technical support for manufacturing biodegradable film with soybean straw.
Number of references:25
Main heading:Fibers
Controlled terms:Aspect ratio - Feeding - Film preparation - Industrial research - Oilseeds - Optimization - Speed - Straw - Tensile strength
Uncontrolled terms:Biodegradable film - Central composite - Contribution rate - Design-expert - Effects of materials - Environmental pollutions - Feed-rates - Feeding rate - Fiber aspect ratio - Fiber properties - Fiber yield - High strength - High yield - Operating parameters - Operation temperature - Optimal parameter - Orthogonal experimental design - Parameters optimization - Physical methods - Preparation technology - Response functions - Soak time - Soaking time - Soybean straw - Spindle speed - Technical support
Classification code:931.1 Mechanics - 921.5 Optimization Techniques - 901.3 Engineering Research - 821.5 Agricultural Wastes - 821.4 Agricultural Products - 943 Mechanical and Miscellaneous Measuring Instruments - 817 Plastics and Other Polymers: Products and Applications - 712.1 Semiconducting Materials - 691.2 Materials Handling Methods - 422 Strength of Building Materials; Test Equipment and Methods - 421 Strength of Building Materials; Mechanical Properties - 812 Ceramics, Refractories and Glass
DOI:10.3969/j.issn.1002-6819.2012.13.043
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 40>
Accession number:20123515381893
Title:Spatio-temporal distribution and optimization of rural settlements in Gangu county of loess hilly area
Authors:Ma, Libang (1); Guo, Xiaodong (2); Zhang, Qiyuan (2)
Author affiliation:(1) College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730000, China; (2) School of Management Lanzhou University, Lanzhou 730000, China
Corresponding author:Guo, X.(gxd@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:13
Issue date:July 1, 2012
Publication year:2012
Pages:217-225
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 provide preliminary reference for the optimized of rural settlements area and intensive use of land the spatio-temporal distribution of rural settlements in Loess Hilly Area, Gangu county was analyzed,. Based on the remote sensing images of Landsat-5 TM in 1998 and SPOT 5 in 2008, the method of landscape pattern analysis and GIS spatial analysis were used to discussed spatio-temporal variability and optimized spatial distribution of rural settlements in Gangu county from 1998 to 2008. The results showed that from the perspective of temporal distribution, the proportion of the area of rural settlements in the total land area increased from 3.69% to 5.45% in the last decade; patches number (NP) and total plaque area (CA) increased by 114.77% and 47.76% respectively. The settlement patches have a high density of 1.68 per km<sup>2</sup> at present; The patches were quite different over the two periods and the average plaque area (MPS) decreased. From the perspective of spatial distribution, the density of rural settlements in 2008 was significantly higher than that in 1998, the distribution pattern of rural settlements vary spatially as dense in the northeast and areas around county, while sparse in the southwest. Rural settlements showed a strong association with the elevation, slope, traffic and water resources, and they mainly located in areas with low altitude, gentle slope and closed to road or river. For the coordinated social and economic development of urban and rural areas and the successful realization of well-off society, it is necessary to optimize spatial distribution of rural settlements in Gangu county with three development patterns of the priority development, extension development and centralized development.
Number of references:30
Main heading:Optimization
Controlled terms:Economics - Image reconstruction - Land use - Remote sensing - Rural areas - Spatial distribution - Water resources
Uncontrolled terms:Distribution patterns - Economic development - Gangu county - Gentle slopes - High density - Hilly areas - Land areas - Landsat-5 - Landscape pattern analysis - Low altitudes - Pattern optimization - Remote sensing images - Rural settlement - Spatial analysis - Spatiotemporal distributions - Spatiotemporal variability - Temporal distribution - Urban and rural areas
Classification code:921.5 Optimization Techniques - 921 Mathematics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 971 Social Sciences - 741 Light, Optics and Optical Devices - 444 Water Resources - 403 Urban and Regional Planning and Development - 731.1 Control Systems
DOI:10.3969/j.issn.1002-6819.2012.13.035
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 41>
Accession number:20123515381872
Title:Effect of fluid-structure interaction on internal and external characteristics of centrifugal pump
Authors:Liu, Houlin (1); Xu, Huan (1); Wu, Xianfang (1); Wang, Kai (1); Tan, Minggao (1)
Author affiliation:(1) Research Center of Fluid Machinery Engineering and Technical, Jiangsu University, Zhenjiang 212013, China
Corresponding author:Xu, H.(xhqq_1234@126.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:82-87
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 inner flow mechanism of the fluid-structure interaction (FSI) effect on the external characteristics, the external characteristics and internal flow features of a diffuser pump were analyzed with the two-way flow solid coupling method. The steady flow field was based on Reynolds Averaged N-S equations with standard k-E turbulent model, the unsteady flow field was based on the large eddy simulation, and the structure response was based on elastic transient structural dynamic equation. Compared with the results without FSI, the total pressure and velocity distributions at the outlet of the impeller were analyzed. Inner flow mechanism for the effect of the FSI on prediction of the external characteristics was calculated. And the pressure fluctuations of the impeller at outlet were also analyzed. The results show that, the main reason for the variation of the external characteristics prediction based on the effect of the FSI is the deformation of the impeller, especially at the outlet of the impeller. Considering the effect of the FSI, the tendency of the pressure fluctuations is similar to the results without FSI, but the amplitude is larger. Maximum pressure pulse amplitude is improved by 3.1 percent. The results can provide reference for the research of performance prediction and flow induced vibration in centrifugal pump.
Number of references:27
Main heading:Impellers
Controlled terms:Centrifugal pumps - Computer simulation - Flow fields - Fluid structure interaction - Forecasting - Navier Stokes equations - Structural dynamics
Uncontrolled terms:Coupling methods - Diffuser pumps - External characteristic - Flow induced vibrations - Inner - Inner flow - Internal flows - Maximum pressure - N-S equations - Performance prediction - Prediction-based - Pressure fluctuation - Reynolds averaged - Structure response - Total pressure - Turbulent models
Classification code:408 Structural Design - 601.2 Machine Components - 618.2 Pumps - 631.1 Fluid Flow, General - 723.5 Computer Applications - 921 Mathematics
DOI:10.3969/j.issn.1002-6819.2012.13.014
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 42>
Accession number:20123515381892
Title:Drying kinetics of condensation stage in super-heated steam drying
Authors:Shi, Yongchun (1); Li, Jie (2); Li, Xuanyou (2); Wang, Chengyun (2); Zhao, Gaiju (2); Yin, Fengjiao (2)
Author affiliation:(1) School of Energy and Power Engineering, Shandong University, Jinan 250061, China; (2) Industrial Energy Conservation Research Center, Shandong Academy of Sciences, Jinan 250103, China
Corresponding author:Li, J.(jeff_lee@foxmail.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:211-216
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 explore the mechanism of the drying process and to optimize the drying operation, the comparative test was conducted with hot air drying and super-heated steam drying for lignite. The results showed that the steam condensation happened obviously in the initial stage of the super-heated steam drying, which resulting the obvious different drying kinetics compared to the hot air drying. The effect of the steam condensation on the initial stage of the drying process was studied through theoretical analysis of drying kinetics of super-heated steam drying. The mathematical model of super-heated steam drying was improved by combining the steam condensation on the basis of the mathematical model of the hot air drying. The experimental results verified that the fitting precision of the improved mathematical model was well and the determination coefficient was above 0.97. The study can provide a basis for optimizing the design and operating conditions of the drying equipment.
Number of references:27
Main heading:Drying
Controlled terms:Condensation - Enzyme kinetics - Kinetics - Mathematical models - Models - Optimization - Steam - Steam condensers
Uncontrolled terms:Comparative tests - Determination coefficients - Drying equipment - Drying kinetic - Drying operation - Drying process - Fitting precision - Hot air drying - Initial stages - Operating condition - Steam condensation - Steam drying
Classification code:921.5 Optimization Techniques - 921 Mathematics - 902.1 Engineering Graphics - 931 Classical Physics; Quantum Theory; Relativity - 802.3 Chemical Operations - 614.2 Steam Power Plant Equipment and Operation - 614 Steam Power Plants - 802.2 Chemical Reactions
DOI:10.3969/j.issn.1002-6819.2012.13.034
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 43>
Accession number:20123515381871
Title:Simulation and theoretical analysis on trapped oil pressure in external gear pump influenced by vibration
Authors:Li, Yulong (1); Sun, Fuchun (1)
Author affiliation:(1) Industrial Manufacturing College, Chengdu University, Chengdu 610106, China
Corresponding author:Li, Y.(leo-world@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:77-81
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 analyzing the influence of gear pair vibration on simulation results of trapped oil pressure stored in the two trapped oil zones of external gear pump, the related pressure simulation model was derived, based on vibration and vibrationless of gear pair, the various leakages from the two trapped oil zones were compared with each other, then the size of two trapped oil pressure value was theoretically analyzed, and the analyzed conclusions were supported by simulation results and experimental verification. All results showed that the pressure peak in the first trapped oil zone was greater than in the second trapped oil zone; the peak difference of two trapped oil pressures in the case of vibration was smaller than in the case of vibrationless; the higher output pressure of pump was, the greater peak difference was; and the simulation results in vibration was more accurate than in vibrationless, for example, the simulation error of the sixth group was reduced from 16.7% to 7.8%, thus in the simulation of trapped oil pressure, the vibration factor was necessary to be involved, et al. The dynamic trapped oil model can provide a theory and for next pump design.
Number of references:25
Main heading:Gear pumps
Controlled terms:Computer simulation - Oil well production
Uncontrolled terms:Experimental verification - External gear pumps - Oil pressures - Oil zone - Pressure peaks - Pressure simulations - Pump design - Simulation error - Vibrations
Classification code:511.1 Oil Field Production Operations - 618.2 Pumps - 723.5 Computer Applications
DOI:10.3969/j.issn.1002-6819.2012.13.013
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 44>
Accession number:20123515381886
Title:Deadbeat control strategy of shunt active power filter based on repetitive predictor theory
Authors:Zhang, Guorong (1); Shao, Zhuxing (1); Chen, Lin (1)
Author affiliation:(1) Education Ministry Engineering Research Center of Photovoltaic System, Hefei University of Technology, Hefei 230009, China
Corresponding author:Zhang, G.(zhanggrcao@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:172-178
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 make the active power filter (APF) can fast and precisely output compensation harmonic, this paper presented an improved deadbeat control algorithm based on repetitive prediction principle for APF's main circuit. This paper firstly introduced the working principle of the parallel active power filter, secondly established the mathematical model of the three-phase shunt active power filter and analyzed deadbeat control principle according to mathematical model. Finally it is known that harmonic instruction current signal prediction is the key to determining the deadbeat control effect, through the deadbeat control principle. In order to improve APF's filtering effect with the deadbeat control method, the improved repetitive prediction strategy was employed to predict the next beat output current according to the harmonic periodicity, and its stability was analyzed. This improved repetitive predictive deadbeat control strategy can improve the steady precision and transient response speed. Simulation waveform analysis and experimental results analysis proved the feasibility of the control strategy.
Number of references:27
Main heading:Active filters
Controlled terms:Algorithms - Electricity - Forecasting - Harmonic analysis - Mathematical models
Uncontrolled terms:Active power filters - Control strategies - Current signal - Deadbeat control - Filtering effects - Main circuit - Output current - Parallel active power filter - Repetitive predictor - Shunt active power filters - Working principles
Classification code:701.1 Electricity: Basic Concepts and Phenomena - 703.2 Electric Filters - 921 Mathematics - 921.6 Numerical Methods
DOI:10.3969/j.issn.1002-6819.2012.13.028
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 45>
Accession number:20123515381903
Title:Process optimization on extracting collagen with enzymolysis method from black fungus
Authors:Liu, Jingbo (1); Zhao, Songning (1); Lin, Songyi (1); Zhang, Yan (1); Ren, Meng (1)
Author affiliation:(1) Laboratory of Nutrition and Functional Food, Collagen of Quartermaster Technology, Jilin university, Changchun 130060, China
Corresponding author:Lin, S.(linsongyi730@163.com)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:282-286
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:In order to improve extracting yield of collagen from black fungus, the optimum conditions for collagen extracting process with enzyme methods were investigated. The method of single factor experiment and polybasic quadratic regression orthogonal design model were used to analysis the effects of these factors. The results showed that, within limits, the extracting yield positively related with pH value and the ratio of liquid and material, negatively related with additive amount and extracting time. The optimized processing parameters were as follow: trypsin, enzymolysis pH value 8.0, ratio of liquid and material 52.5:1 mL/g, enzyme additive amount 8%, enzymolysis time 2 h. With these conditions, extracting yield of collagen from black fungus could reach up to 1.091%. The results can provide a reference for extracting plant collagen.
Number of references:26
Main heading:Extraction
Controlled terms:Collagen - Enzymes - Factor analysis - Liquids - Optimization - pH
Uncontrolled terms:Enzymolysis - Optimum conditions - Orthogonal design - pH value - Processing parameters - Quadratic regression
Classification code:931.2 Physical Properties of Gases, Liquids and Solids - 922.2 Mathematical Statistics - 921.5 Optimization Techniques - 814 Leather and Tanning - 802.3 Chemical Operations - 801.2 Biochemistry - 801.1 Chemistry, General
DOI:10.3969/j.issn.1002-6819.2012.13.045
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
<RECORD 46>
Accession number:20123515381891
Title:Anaerobic fermentation characteristic of green corn straw pretreated by steam explosion
Authors:Xu, Guizhuan (1); Fan, Shuaiyao (1); Wang, Xinfeng (1); Tian, Daomeng (1); Zhang, Bailiang (1)
Author affiliation:(1) Mechanical and Electrical Engineering College, Henan Agricultural University, Key Laboratory of Renewable Energy of Ministry of Agriculture, Zhengzhou 450002, China
Corresponding author:Zhang, B.(hauzblo@126.com.cn)
Source title:Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Abbreviated source title:Nongye Gongcheng Xuebao
Volume:28
Issue:13
Issue date:July 1, 2012
Publication year:2012
Pages:205-210
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 anaerobic fermentation characteristic of green corn straw pretreated by steam explosion method was studied. The steam explosion pressure and during time were 2.5 MPa and 90 s. The fermentaion experiments were carried out with 30% (mass percentage) of the biogas slurry. The TS (total solid mass) mass percentages of the steam-exploded straw were 1%, 2%, 3%, 4%, 6%, 8%, 10% respectively, and 15% and that of the green straw without pretreatment was 6%. The pH value, CH<inf>4</inf> volume percentage and biogas yield were measured each day. The results showed that, when the TS mass percent was high, the anaerobic fermentation liquid of steam-exploded straw was easily acidificated and the appropriate TS mass percentage was not more than 4%, while fermentation of the unexploded straw could be carried out well under TS mass percentage of 6%. The biogas yield of volatile solid of unexploded straw was 214.6 mL/g, while that of the exploded straw had the maximum value of 334.8 mL/g under the TS mass percentage of 3%. The biogas production rate of volatile solid of unexploded straw was 3.3 mL/g each day, while that of the exploded straw decreased with the increasing of the TS mass percentage and had the maximum value of 14.8 mL/g each day under the TS mass percentage of 1%. The biogas yield and production rate of the exploded straw were improved obviously and the fermentation period was shortened greatly. The research can provide a reference for the straw energy utilization in industrial production.
Number of references:30
Main heading:Steam
Controlled terms:Anaerobic digestion - Biogas - Biomass - Energy utilization - Explosions - Fermentation - Industrial research
Uncontrolled terms:Anaerobic fermentation - Biogas production - Biogas slurry - Corn straws - Industrial production - Mass percentage - Maximum values - pH value - Pre-Treatment - Production rates - Steam explosion - Total solids - Volatile solid - Volume percentage
Classification code:802.2 Chemical Reactions - 614 Steam Power Plants - 525.3 Energy Utilization - 901.3 Engineering Research - 525.1 Energy Resources and Renewable Energy Issues - 502.1 Mine and Quarry Operations - 452.4 Industrial Wastes Treatment and Disposal - 522 Gas Fuels
DOI:10.3969/j.issn.1002-6819.2012.13.033
Database:Compendex
Compilation and indexing terms, Copyright 2012 Elsevier Inc.
期刊信息
- 主管单位 中国科学技术协会
- 主办单位 中国农业工程学会
- 主编 朱明
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