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2015年第46卷第2期共收錄55篇

1. Accession number:  20151300692635

  Title:  Flow resistance testing device of valve-less piezoelectric pump 

  Authors:  Ji, Jing1 ; Hu, Caiqi1  

  Author affiliation:  1  College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao, China 

  Corresponding author:  Ji, Jing 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  322-327 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The pumping performance of valve-less piezoelectric mainly depends on the flow resistance difference between forward and reverse directions, so testing flow resistance is particularly important. Flow resistance testing device of valve-less piezoelectric pump was designed which can realize automatic or semi automatic water supply function and the measured flow range was wide. The device can be easily used to analyze and research flow action law. Hemisphere-segment valve was taken as study object and the resistance coefficient formula was derived. Flow resistances were tested respectively by traditional and novel test devices and theoretical pump flow were calculated. The deviations between theoretical and experimental flow rates were 34.38% and 117.33%, respectively. The results showed that the accuracy of flow resistance test was greatly improved by the flow resistance testing device of valve-less piezoelectric pump, which can test and analyze flow resistance, calculate pump theoretical flow and predict experimental flow.  

  Number of references:  22 

  Main heading:  Pumps 

  Controlled terms:  Piezoelectric devices  -  Piezoelectricity  -  Water supply 

  Uncontrolled terms:  Flow resistance  -  Piezoelectric pump  -  Pumping performance  -  Resistance coefficients  -  Semi-automatics  -  Supply function  -  Test device  -  Valve-less 

  Classification code:  446.1 Water Supply Systems  -  618.2 Pumps  -  701.1 Electricity: Basic Concepts and Phenomena  -  704 Electric Components and Equipment  -  714 Electronic Components and Tubes 

  DOI:  10.6041/j.issn.1000-1298.2015.02.048 

  Database:  Compendex

 

2. Accession number:  20151300692618

  Title:  Development of organics solution phase change materials for preservation of agricultural products 

  Authors:  Ying, Tiejin1 ; Zhu, Bingqing2 ; Qi, Xiaoli2 ; Sheng, Kuang2  

  Author affiliation:  1  Fuli Institute of Food Science, Zhejiang University, Hangzhou, China

 2  College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China 

  Corresponding author:  Ying, Tiejin 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  208-212 and 207 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  An effective organics solution phase change materials (PCMs) with high phase enthalpy change and low onset temperature was developed, which can be applied to store and preserve several kinds of agricultural produces with different optimal storage temperature. Glycine, lysine, sorbitol, proline and glucose were preselected and determined with the differential scanning calorimetry (DSC), and glycine solution was chosen as the main energy storage materials due to its highest phase enthalpy change among these five materials under the same onset temperature. To achieve a lower onset temperature, glycine was matched with 0.1 mol/L glycerol solution and 0.1% sodium benzoate was added to extent self-life of PCMs and super-absorbent polymers (SAP) as matrix. The final formula of the organics solution PCMs was 0.4~0.8 mol/L glycine, 0.1 mol/L glycerol, 0.1% sodium benzoate and water with 0.75%~0.81% SAP as matrix. A series of this organics solution PCMs could be prepared with the change of the concentration of glycine solution, whose phase enthalpy change was 296.4~305.9 J/g and onset temperature was -7.3~-5. Furthermore, there was almost no supercooling and phase separation phenomenon and it was safe and practical.  

  Number of references:  16 

  Main heading:  Phase change materials 

  Controlled terms:  Agricultural products  -  Agriculture  -  Amino acids  -  Benzoic acid  -  Differential scanning calorimetry  -  Enthalpy  -  Glycerol  -  Phase separation  -  Sodium  -  Wood preservation 

  Uncontrolled terms:  Enthalpy change  -  Glycine solutions  -  Low onset temperatures  -  Onset temperature  -  Organics  -  Sodium benzoate  -  Storage temperatures  -  Superabsorbent polymer 

  Classification code:  549.1 Alkali Metals  -  615 Thermoelectric, Magnetohydrodynamic and Other Power Generators  -  616 Heat Exchangers  -  641.1 Thermodynamics  -  803 Chemical Agents and Basic Industrial Chemicals  -  804.1 Organic Compounds  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  821.4 Agricultural Products  -  933 Solid State Physics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.031 

  Database:  Compendex

 

3. Accession number:  20151300692628

  Title:  Adaptive off-line neural network inverse control for energy-harvesting suspension 

  Authors:  Chen, Long1 ; Shi, Dehua1 ; Wang, Ruochen1 ; Qian, Jin'gang1  

  Author affiliation:  1  School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang, China 

  Corresponding author:  Chen, Long 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  281-287 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The Boost/Buck converter was introduced into the energy-harvesting circuit to coordinate dynamic performance and energy-harvesting performance of energy-harvesting suspension system. The non-linear mathematical model of DC-DC converter was described by the summation of steady-state components and disturbance components. Considering the mapping capability of neural network and anti-interference of FIR filter, adaptive off-line neural network inverse controller was designed. The controller was composed of off-line neural network inverse controller and adaptive controller. The off-line neural network inverse controller was used to provide steady control input with steady components of DC-DC converter as training samples, while the adaptive controller was used to provide compensation dynamic control generated by parameter variations and uncertain interference. On this basis, the converter sample was made and the rapid control prototyping experiment was performed to validate the performance of the controller. To meet the suspension vibration isolation performance and harvest vibration energy to a large degree, the suspension control parameters was decided. And a linear motor was tested to obtain its characteristic parameters. Simulations were applied to a two-degree of freedom energy-harvesting suspension. The results showed that the linear motor can produce the desired electromagnetic damping force with the proposed controller and improve vehicle comfort. It also indicated that self-powered control with energy harvested from suspension was attainable.  

  Number of references:  20 

  Main heading:  Adaptive control systems 

  Controlled terms:  Controllers  -  DC-DC converters  -  Degrees of freedom (mechanics)  -  Energy harvesting  -  HVDC power transmission  -  Linear motors  -  Suspensions (components)  -  Uncertainty analysis 

  Uncontrolled terms:  Adaptive Control  -  Adaptive controllers  -  Electromagnetic damping  -  Mapping capabilities  -  Neural network inverse system  -  Rapid control prototyping  -  Two-degree of freedom  -  Vibration isolations 

  Classification code:  525.5 Energy Conversion Issues  -  601.2 Machine Components  -  704.1 Electric Components  -  705.3 Electric Motors  -  706.1.1 Electric Power Transmission  -  731.1 Control Systems  -  731.5 Robotics  -  732.1 Control Equipment  -  922.1 Probability Theory 

  DOI:  10.6041/j.issn.1000-1298.2015.02.041 

  Database:  Compendex

 

4. Accession number:  20151300692621

  Title:  Freshly squeezed effect on low temperature stress for apple 

  Authors:  Yao, Gang1 ; Li, Fengcheng2 ; Zhang, Shaoying1 ; Du, Zhilong2 ; Wang, Yequn1 ; Liu, Ting1  

  Author affiliation:  1  College of Engineering, China Agricultural University, Beijing, China

 2  Chinese Academy of Agricultural Mechanization Sciences, Beijing, China 

  Corresponding author:  Zhang, Shaoying 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  228-233 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  To improve the content of ascorbic acid of fresh apple juice, apples of 'Ralls' and 'Fuji' juice were prepared after cold stress, and then some important quality indexes were measured. Contents of total ascorbic acid, AA and DHA of 'Ralls' and 'Fuji' reached maximum values after 20 h and 8 h of cold treatment at (-7±0.5), respectively. Compared with the apples without cold treatment, contents of total ascorbic acid, AA and DHA of 'Ralls' and 'Fuji' were increased about 26.65%, 28.93%, 18.26% and 15.78%, 17.33%, 11.30%, respectively, and the contents of soluble solid, soluble sugar and malic acid were declined about 8.21%, 13.04%, 7.27% and 11.46%, 14.14%, 7.14%, respectively. Fresh juice was prepared at room temperature within 30 min after cold treatment at (-7±0.5). Compared with the juice of apples without cold treatment, contents of total ascorbic acid, AA and DHA of 'Ralls' and 'Fuji' were increased about 31.26%, 35.40%, 20.54% and 18.05%, 20.46%, 13.33%, respectively, and contents of soluble sugar, malic acid and sugar-acid ratio were declined about 12.03%, 7.54%, 5.92% and 14.53%, 10.00%, 5.04%, respectively; aroma substance was increased by 6 and 5 kinds, and its contents increased about 2.03% and 8.02%, respectively. The results indicated that cold stress could be considered as an effective measure to improve the contents of ascorbic acid for fresh apple juice.  

  Number of references:  16 

  Main heading:  Ascorbic acid 

  Controlled terms:  Fruit juices  -  Fruits  -  Organic acids  -  Temperature 

  Uncontrolled terms:  Apple  -  Aroma substances  -  Cold stress  -  Effective measures  -  Freshly squeezed  -  Nutritional ingredients  -  Room temperature  -  Total ascorbic acids 

  Classification code:  641.1 Thermodynamics  -  804.1 Organic Compounds  -  821.4 Agricultural Products  -  822.3 Food Products 

  DOI:  10.6041/j.issn.1000-1298.2015.02.034 

  Database:  Compendex

 

5. Accession number:  20151300692591

  Title:  Automatic sorting system of egg embryo in biological vaccines production based on multi-information fusion 

  Authors:  Xu, Yanwei1 ; Xu, Aijun1 ; Xie, Tancheng1 ; Cui, Jianpeng1 ; Mao, Hengxuan1 ; Liu, Shouchuan2  

  Author affiliation:  1  School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang, China

 2  Pulike Biological Engineering, Inc., Luoyang, China 

  Corresponding author:  Xie, Tancheng 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  20-26 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Identification and sorting technology of egg embryo in biological vaccines production with the method of multi-information fusion was researched. The regularity cognition was obtained by the researches on image features, degradation of temperature and variations of transmittance of different types of egg embryo, which indicated that there were many thick radial blood vessels in living egg embryo image and few thin fractured blood vessels in weak egg embryo image, no blood vessels in dead egg embryo image and obvious black blocks features in polluted egg embryo image were found. The rates of temperature decay of living embryo, weak embryo, polluted embryo and dead embryo increased successively, and the transmittance of living embryo decreased gradually with hatching time increase while the variation of the transmittance of other egg embryo were comparatively lesser. The BP neural network model was established to do the egg embryo condition identification based on the information fusion of images, temperature and transmittance. Finally, 80 eggs were randomly selected to collect the information of images, temperature and transmittance to do the verifying experiment, the eggs were hatched six days and taken out from the 37.8 incubator and placed under normal room temperature for ten minutes. The result indicated that the identification accuracy of the system was 96.25%, which was increased by 6.25%, 13.75% and 8.75%, respectively, compared with that only using image, temperature or transparency sensors.  

  Number of references:  24 

  Main heading:  Image processing 

  Controlled terms:  Blood vessels  -  Information fusion  -  Neural networks  -  Vaccines 

  Uncontrolled terms:  Automatic sorting systems  -  BP neural network model  -  Condition identification  -  Egg embryos  -  Identification accuracy  -  Multi-information fusion  -  Sorting system  -  Temperature decay 

  Classification code:  461 Bioengineering and Biology  -  741 Light, Optics and Optical Devices  -  903.1 Information Sources and Analysis 

  DOI:  10.6041/j.issn.1000-1298.2015.02.004 

  Database:  Compendex

 

6. Accession number:  20151300692624

  Title:  Status and prospect of agricultural remote sensing 

  Authors:  Shi, Zhou1 ; Liang, Zongzheng1 ; Yang, Yuanyuan1 ; Guo, Yan2  

  Author affiliation:  1  Institute of Agricultural Remote Sensing and Information Technology, Zhejiang University, Hangzhou, China

 2  Institute of Agricultural Economics and Information, Henan Academy of Agricultural Sciences, Zhengzhou, China 

  Corresponding author:  Shi, Zhou 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  247-260 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Remote sensing technology can cost-effectively access a wide range of real-time land surface spatial information, and provides an effective way for resource surveys, environmental monitoring and disaster prediction. With the help of remote sensing technology, geo-information can be acquired quickly, accurately, efficiently and comprehensively. Undoubtedly, remote sensing will play an increasingly important role in the fields of geosciences, agricultural sciences, and so on. In particular civil resources satellite was launched in the 1970s, which was applied in agriculture and benefited first. Moreover, significant developments were registered in some key fields along with the advancement of high resolution remote sensing. The combination of their high temporal frequency with extended geographical coverage makes them particularly useful for time series crop growth monitoring, crop types subdivision, and acquisition of field precision agriculture. The fact is of note that the new challenges followed as a result of the dispersion and spatial-temporal variability in agricultural production. An overview of the history and theoretical background of agricultural remote sensing technology was introduced. And then four aspects of yield estimation, agricultural resources survey, agricultural disaster monitoring and precision agriculture management were presented. Remotely sensed data from existing platforms and the ground observation network technology which can provide an important data source for supporting agriculture were expected. On the other hand, new generation remote sensing platform of low altitude unmanned aerial vehicle (UAV) should be promoted. Although progress has been made, current methods and techniques still bear potential to further explore multi-sensors, spectral data, surface characteristic parameters and existing crop model. The combination of multi-sensor data and assimilation will enhance the perspectives of using remotely sensed data for agriculture.  

  Number of references:  82 

  Main heading:  Remote sensing 

  Controlled terms:  Agriculture  -  Airships  -  Crops  -  Disasters  -  Environmental technology  -  Surveys  -  Unmanned aerial vehicles (UAV)  -  Unmanned vehicles 

  Uncontrolled terms:  Agricultural disasters  -  Agricultural remote sensing  -  Crop yield  -  Environmental Monitoring  -  High resolution remote sensing  -  Remote sensing platforms  -  Remote sensing technology  -  Soil investigation 

  Classification code:  405.3 Surveying  -  454 Environmental Engineering  -  472 Ocean Engineering  -  484 Seismology  -  652 Aircraft and Avionics  -  731.1 Control Systems  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  821.4 Agricultural Products 

  DOI:  10.6041/j.issn.1000-1298.2015.02.037 

  Database:  Compendex

 

7. Accession number:  20151300692605

  Title:  Effects of land reclamation time and soil bulk density on soil hydraulic parameters in coastal reclamation region 

  Authors:  She, Dongli1 ; Zheng, Jiaxing1 ; Liu, Yingying2 ; Gao, Xuemei1  

  Author affiliation:  1  Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, Hohai University, Nanjing, China

 2  The Management Office of Zhujiang Embankment, Guangzhou, China 

  Corresponding author:  She, Dongli 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  120-125 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to investigate the effect of land reclamation time and soil bulk density on soil hydraulic parameters, a study combined laboratory experiments with theoretical analysis was conducted to examine the changes of soil saturated hydraulic conductivity, soil water characteristic curve, and diffusivity with two different bulk densities of four reclamation soils. Results showed that the land reclamation time had significant effects on soil particle component, soil structure, sodium salt content, and so on. Soil saturated hydraulic conductivity decreased with the increase of land reclamation time, while water-holding capacity and soil moisture diffusivity increased with the increase of land reclamation time. Soil saturated hydraulic conductivity, diffusivity and soil water content under the same suction force decreased with the increase of bulk density. With increasing reclamation time, the influences of soil bulk density change on soil hydraulic parameters became more obvious.  

  Number of references:  19 

  Main heading:  Land reclamation 

  Controlled terms:  Diffusion  -  Hydraulic conductivity  -  Land use  -  Reclamation  -  Soil moisture  -  Soils 

  Uncontrolled terms:  Disc infiltrometer  -  Laboratory experiments  -  Saturated hydraulic conductivity  -  Soil bulk density  -  Soil hydraulic parameters  -  Soil infiltration  -  Soil water content  -  Soil-water characteristic curve 

  Classification code:  442.2 Land Reclamation  -  452.4 Industrial Wastes Treatment and Disposal  -  483.1 Soils and Soil Mechanics  -  632.1 Hydraulics  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.018 

  Database:  Compendex

 

8. Accession number:  20151300691896

  Title:  Modeling of heat transfer and displacement error from heat of giant magnetostrictive actuator applied in servovalve 

  Authors:  Li, Yuesong1, 2 ; Zhu, Yuchuan1 ; Wu, Hongtao1 ; Yang, Xulei1 ; Ji, Liang1  

  Author affiliation:  1  College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China

 2  School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang, China 

  Corresponding author:  Zhu, Yuchuan 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  343-350 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The performance of servovalve driven by giant magnetostrictive actuator is seriously affected by temperature rising. In order to reduce the error from temperature rising, a giant magnetostrictive actuator applied in servovalve was presented and its working principle was introduced. The output displacement error of actuator from rising of temperature was controlled by cooling and compensating. In order to analyze the influence of heat on the accuracy of giant magnetostrictive actuator, heat transfer model was deduced from the theory of heat conduction and transversal heat transfer, the steady-state temperature on giant magnetostrictive rod and shell were given, and the simulation results were verified by numerical simulation. The results showed that when the velocity of oil surrounding giant magnetostrictive rod was more than 0.1 m/s at control current of 1 A, temperature of giant magnetostrictive rod and shell was about 20.3, the difference in temperature can be limited below 0.2, and temperature rise of giant magnetostrictive actuator was small. The displacement error from heat was derived based on the model described the temperature on giant magnetostrictive rod and shell. The simulation results showed that when the velocity of oil surrounding giant magnetostrictive rod was more than 0.1 m/s, the output displacement from heat was less than 0.1 μm.  

  Number of references:  17 

  Main heading:  Magnetostrictive devices 

  Controlled terms:  Actuators  -  Heat conduction  -  Heat transfer  -  Oil shale 

  Uncontrolled terms:  Accuracy  -  Giant magnetostrictive  -  Giant magnetostrictive actuator  -  Heat transfer model  -  Model of heat transfers  -  Servo-valve  -  Steady state  -  Steady-state temperature 

  Classification code:  512.1 Petroleum Deposits  -  632 Hydraulics, Pneumatics and Related Equipment, and Fluidics  -  641.2 Heat Transfer  -  704 Electric Components and Equipment  -  714 Electronic Components and Tubes 

  DOI:  10.6041/j.issn.1000-1298.2015.02.051 

  Database:  Compendex

 

9. Accession number:  20151300692608

  Title:  Numerical simulation of water-salt distribution under brackish water film hole furrow irrigation based on hydrus-3D model 

  Authors:  Ma, Haiyan1 ; Wang, Xin1 ; Zhang, Zhanyu2 ; Feng, Genxiang2 ; Lü, Ningjiang1  

  Author affiliation:  1  Water Resources Research Institute of Shandong Province, Ji'nan, China

 2  College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, China 

  Corresponding author:  Ma, Haiyan 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  137-145 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  As the starting point to the research of water-salt transport rules under the condition of film hole furrow irrigation, water-salt distribution under brackish water film hole furrow irrigation was studied systematically by experimental observation and numerical simulation. Infiltration of film hole furrow irrigation under the condition of laboratory test was simulated with HYDRUS-3D model. Using HYDRUS-3D model to simulate the infiltration of film hole furrow irrigation was a method with relatively higher reliability. Simulation scenarios with three holed ratios and four irrigation water amount levels were designed on this basis. The water-salt transport rules of different simulation scenarios were explored, so as to provide reference for the design of film hole furrow irrigation. Simulation results showed that when irrigation amount changed from 450 m3/hm2to 900 m3/hm2the soil salt in 0~40 cm soil depth could be restrained in a short time, and the salt rejection rate of 3%, 6% and 9% holed ratios were all above 46%, which could provide good environment for the growth of peanuts. Under the condition of film hole furrow irrigation, irrigation amount should not be less than 300 m3/hm2for achieving the effects of economizing water and reducing salt content. The research results could both provide theoretical and technical basis for popularization and application of brackish water film hole furrow irrigation technology and provide reasonable soil secondary salinization prevention measures as well as scientific basis for water management in the field.  

  Number of references:  17 

  Main heading:  Infiltration 

  Controlled terms:  Computer simulation  -  Irrigation  -  Numerical models  -  Soil testing  -  Soils  -  Water management 

  Uncontrolled terms:  Brackish water  -  Furrow irrigation  -  Irrigation amounts  -  Irrigation waters  -  Prevention measures  -  Research results  -  Salt rejection rates  -  Soil secondary salinizations 

  Classification code:  444 Water Resources  -  446 Waterworks  -  483.1 Soils and Soil Mechanics  -  723.5 Computer Applications  -  821.3 Agricultural Methods  -  921 Mathematics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.021 

  Database:  Compendex

 

10. Accession number:  20151300692601

  Title:  Effects of water and nitrogen coupling on nitrogen uptake of muskmelon and nitrate accumulation in soil 

  Authors:  Yue, Wenjun1 ; Zhang, Fucang1, 2 ; Li, Zhijun1, 2 ; Zou, Haiyang1, 2 ; Gao, Yue1, 2  

  Author affiliation:  1  Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi, China

 2  Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi, China 

  Corresponding author:  Zhang, Fucang 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  88-96 and 119 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  A greenhouse muskmelon variety was grown under mulched drip irrigation to investigate the effects of different water and nitrogen levels on nitrogen nutrient absorption, distribution and yield of greenhouse muskmelon, soil NO3--N distribution and accumulation, which can provide theoretical basis for high water-fertilizer use efficiency and the optimal regulation and control of greenhouse muskmelon. Muskmelon plants were subjected to three irrigation levels and three nitrogen levels, and totally were 9 treatments. Treatments were completely arranged according to randomization. Results showed that the above-ground dry matter accumulation and amounts of N accumulation were obtained in the treatment of W2N2and the content of soil NO3--N was the highest in 0~15 cm soil layer after the muskmelon harvest and the content of soil NO3--N decreased with the increase of soil depth. The accumulation of 0~60 cm soil NO3--N increased with the increase of nitrogen rate and decreased with the increase of irrigation amount. The yield of muskmelon increased with the increase of irrigation amount and nitrogen rate except for the treatment of W3and N3. It was concluded that the irrigation level W2and nitrogen level N2could be recommended as the best combination of water and nitrogen which can improve muskmelon yield in the production of muskmelon under drip irrigation with plastic film mulched in the experimental area.  

  Number of references:  36 

  Main heading:  Nitrogen fertilizers 

  Controlled terms:  Grain (agricultural product)  -  Greenhouses  -  Irrigation  -  Nitrates  -  Nitrogen  -  Soils  -  Water absorption 

  Uncontrolled terms:  Dry matter accumulation  -  Muskmelon  -  Nitrate nitrogen  -  Nitrogen assimilation  -  Solar greenhouse 

  Classification code:  483.1 Soils and Soil Mechanics  -  802.3 Chemical Operations  -  804 Chemical Products Generally  -  804.2 Inorganic Compounds  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control 

  DOI:  10.6041/j.issn.1000-1298.2015.02.014 

  Database:  Compendex

 

11. Accession number:  20151300692631

  Title:  Vehicle state and parameter estimation under driving situation based on extended kalman particle filter method 

  Authors:  Bao, Ruixin1, 2 ; Jia, Min1 ; Sabbioni, Edoardo2 ; Yu, Huilong2  

  Author affiliation:  1  School of Mechanical Engineering, Liaoning Shihua University, Fushun, China

 2  Department of Mechanical Engineering, Politecnico di Milano, Milano, Italy 

  Corresponding author:  Bao, Ruixin 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  301-306 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Individual parameters of vehicle dynamic systems were traditionally derived from expensive component indoor laboratory tests as a result of an identification procedure. These parameters were then transferred to vehicle models used at a design stage to simulate the vehicle handling behavior and the cost of measurement was high. At the same time, acquiring the vehicle's driving status and parameters had important significance for the process controlling of the vehicle. Normally, the status and parameter of the test vehicle needed to be estimated together, which were then transferred to vehicle models and used at a design stage to simulate the vehicle handling behavior. A vehicle dynamics system containing constant noise and non-linear model was established, Runge-Kutta method was used to simulate the model. The extended Kalman filter algorithm was used as the importance density function to update particles in particle filter, with which the local state estimated values and parameters can be calculated. The simulation results showed that the proposed algorithm improved the accuracy of standard particle filter.  

  Number of references:  19 

  Main heading:  Parameter estimation 

  Controlled terms:  Airships  -  Design  -  Extended Kalman filters  -  Kalman filters  -  Monte Carlo methods  -  Runge Kutta methods  -  Vehicles 

  Uncontrolled terms:  Driving situations  -  Dynamics modeling  -  Extended Kalman filter algorithm  -  Extended Kalman particle filters  -  Identification procedure  -  Importance density function  -  Particle filter  -  Process controlling 

  Classification code:  408 Structural Design  -  432 Highway Transportation  -  652.5 Balloons and Gliders  -  731.1 Control Systems  -  921.6 Numerical Methods  -  922.2 Mathematical Statistics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.044 

  Database:  Compendex

 

12. Accession number:  20151300692609

  Title:  Optimum measurement distance of water flow velocity over frozen slopes with pulse boundary model method 

  Authors:  Dong, Yuequn1 ; Zhuang, Xiaohui1 ; Lei, Tingwu1 ; Ma, Yuying1 ; Yin, Zhe1  

  Author affiliation:  1  College of Water Resources and Civil Engineering, China Agricultural University, Beijing, China 

  Corresponding author:  Lei, Tingwu 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  146-152 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The water flow velocity over hillslope is an important hydraulic parameter. A series of comparative flume experiments were conducted to study the flow velocity with pulse boundary model method and dye tracer method, along both the frozen slopes and non-frozen slopes. The flume used in the experiments was 3.8 m long, 0.2 m wide, and 0.08 m high, with soil taken from Koxkar Glacier basin in Akesu, Xinjiang Automous Region. The experimental soil was packed evenly into the flume to a bulk density of 1.0 g/cm3and a thickness of 5 cm. The packed soil was saturated before frozen prior to each experiment. The experiments involved three flow rates (12, 24 and 48 L/min) and three slope gradients (5°, 10° and 15°). The velocities measured by pulse boundary model method increased exponentially with distance from the solution injection location, before becoming steady. The distances for measuring flow velocity with pulse boundary model method on the frozen slope were calculated from the relationship of velocity and distance. The calculated results showed that the minimum distances for measured velocity with an error less than 5% were 1.7~2.7 m and those for an error less than 10% were 1.4~2.1 m from the injector under the given flow rates and slope gradients. The velocities, over frozen slopes, measured by the pulse boundary model method under the given experimental conditions ranged from 0.45 m/s to 0.98 m/s, increased with slope gradients and flow rates, which were 1.43 times of those over non-frozen slopes. The velocities over frozen slopes, as measured by the dye tracer method were 3%~20% higher than those measured by the pulse boundary model method under different slope gradients and flow rates. Those over non-frozen slopes measured by the dye tracer method were 6%~35% higher than those measured by the pulse boundary model method. The result is useful and important to understand the hydraulic dynamic process of frozen soil erosion.  

  Number of references:  16 

  Main heading:  Flow velocity 

  Controlled terms:  Flow of water  -  Flow rate  -  Frozen soils  -  Hydraulics  -  Soils  -  Velocity 

  Uncontrolled terms:  Boundary method  -  Different slopes  -  Experimental conditions  -  Frozen slope  -  Hydraulic dynamics  -  Hydraulic parameters  -  Minimum distance  -  Optimum distance 

  Classification code:  483.1 Soils and Soil Mechanics  -  631 Fluid Flow  -  631.1.1 Liquid Dynamics  -  632.1 Hydraulics  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.022 

  Database:  Compendex

 

13. Accession number:  20151300692594

  Title:  Effect of bottom clearance on flow characteristics of pumping system by CFD and PIV 

  Authors:  Yang, Fan1 ; Liu, Chao1, 2 ; Tang, Fangping1, 2 ; Liang, Haojie2 ; Zhai, Renjie1  

  Author affiliation:  1  School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, China

 2  Hydrodynamic Engineering Laboratory of Jiangsu Province, Yangzhou University, Yangzhou, China 

  Corresponding author:  Yang, Fan 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  40-45 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Based on computational fluid dynamic (CFD) and particle image velocimetry (PIV) technology, factor analysis method was used to study the effect of bottom clearance of flare on the flow characteristics of pumping system, and the occurred location change of submerges vortex and the submerged vortex core trajectory were analyzed emphatically. The results show that the occurred location of submerges vortex change along with the change of bottom clearance of flare, and the occurred location of submerges vortex along with the change of operating condition in the same bottom clearance of flare. With the decrease of bottom clearance, the velocity gradient varies greatly in the zone of the flare bottom. The bottom clearance h=0.8D was strongly suggested and the anti-submerged vortex device should be taken for this kind of box-type inlet passage. The velocity distribution contour of test section by PIV was similar to that by CFD, and the trajectory of submerged vortex by CFD was similar to that by PIV. It was also proved that the measured results showed great agreement with the calculated ones.  

  Number of references:  20 

  Main heading:  Computational fluid dynamics 

  Controlled terms:  Fluid dynamics  -  Hydraulic machinery  -  Pumping plants  -  Pumps  -  Velocity measurement  -  Vortex flow 

  Uncontrolled terms:  Anti-submerged vortex devices  -  Factor analysis method  -  Flow charac-teristics  -  Operating condition  -  Particle image velocimetries  -  Passage  -  Pumping systems  -  Velocity gradients 

  Classification code:  446 Waterworks  -  618.2 Pumps  -  631 Fluid Flow  -  632.2 Hydraulic Equipment and Machinery  -  943.3 Special Purpose Instruments 

  DOI:  10.6041/j.issn.1000-1298.2015.02.007 

  Database:  Compendex

 

14. Accession number:  20151300692614

  Title:  Effects of hydroxyl and methoxyl groups on homolysis of Cβ-O bond in lignin model compounds 

  Authors:  Zhao, Li1 ; Zhang, Yang1 ; Chen, Chen1 ; Lu, Qiang1 ; Dong, Changqing1 ; Yang, Yongping1  

  Author affiliation:  1  National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, China 

  Corresponding author:  Lu, Qiang 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  181-186 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The substituted groups in lignin can influence the pyrolysis characteristics. Density functional theory (DFT) was employed to calculate the bond dissociation energies (BDEs) of the Cβ-O bonds in 18 lignin model compounds with β-O-4 linkages. The model compounds were grouped and compared to discuss the effects of hydroxyl and methoxyl groups at different positions on the BDEs. The interactions between different groups were also studied. The results indicated that there was minor influence of the hydroxyl group at Cα. The hydroxyl group at Cγhardly affected the BDE when there was no methoxyl group at R3. However, when there was methoxyl group at R3, hydrogen bond would be formed between the hydroxyl group at Cγand the methoxyl group at R2, and thus the spatial structure of the model compound would be strengthened and the BDE was increased. The methoxyl groups at R3and R4can reduce the BDEs. The methoxyl group at R3can obviously reduce the BDEs when there was no hydroxyl group at Cγ. However, the reducing effect was weakened when there was hydroxyl group at Cγ, because the hydrogen bond between the methoxyl group at R3and hydroxyl group at Cγwould strengthen the ether bond. The methoxyl group at R4was not influenced by the hydroxyl group at Cγ, and thus the reducing effect on the BDE was stable. The methoxyl group at R1and R2had minor effects on the BDE, and moreover, it did not participate in the interactions with other functional groups.  

  Number of references:  23 

  Main heading:  Complexation 

  Controlled terms:  Bond strength (chemical)  -  Chemical bonds  -  Density functional theory  -  Dissociation  -  Functional groups  -  Hydrogen bonds  -  Lignin  -  Organic polymers 

  Uncontrolled terms:  Bond dissociation energies  -  Homolysis  -  Lignin model compound  -  Model compound  -  Pyrolysis characteristics  -  Reducing effects  -  Spatial structure  -  Substituted groups 

  Classification code:  801.4 Physical Chemistry  -  802.2 Chemical Reactions  -  804.1 Organic Compounds  -  815.1.1 Organic Polymers  -  922.1 Probability Theory 

  DOI:  10.6041/j.issn.1000-1298.2015.02.027 

  Database:  Compendex

 

15. Accession number:  20151300691897

  Title:  Modeling of precision retaining ability for slide guide of machine tool based on wear analysis 

  Authors:  Tan, Yanqing1 ; Zhang, Lianhong1 ; Wang, Kaifeng2 ; Hu, Yahui3  

  Author affiliation:  1  Key Laboratory of Mechanism Theory and Equipment Design, Ministry of Education, Tianjin University, Tianjin, China

 2  Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan, United States

 3  Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems, Tianjin University of Technology, Tianjin, China 

  Corresponding author:  Zhang, Lianhong 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  351-356 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Precision and precision retaining ability are core indicators of performance of high precision machine tool. Guide pair works as the core part of feed system of machine tool and it decides the machining quality and precision of workpieces. Slide guide is one kind of the most frequently used guide pair of machine tool. It is a typical sliding friction system and definitely wear is the primary factor to cause the precision attenuation of the slide guide. The slide guide of machine tool feeds stochastically in its working process, which leads to the complicated wear behavior of the guide surface. Based on statistical theory, an analytical model of precision retaining ability of slide guide was constructed with analysis of the wear characteristics and accuracy attenuation of slide guide under working conditions. The quantitative relationships between precision retaining ability and its influencing factors, i.e., working condition parameters, running parameters, material property and wear coefficient were described by the model. A test bench of precision retaining ability of slide guides was developed. Bench tests of precision retaining ability with the slide guide samples were conducted to validate the theoretical model. The maximal relative error of experimental results and calculated results were 22%. It indicated that the calculated results fit with the experimental results and the model of precision retaining ability was reasonable. The model can predict the accuracy life of slide guide and it also can provide references for the tribology design and precision retaining design for slide guide.  

  Number of references:  17 

  Main heading:  Machine tools 

  Controlled terms:  Models 

  Uncontrolled terms:  Bench tests  -  Condition parameters  -  Machining quality  -  Running parameters  -  Slide guide  -  Statistical theory  -  Theoretical modeling  -  Wear characteristics 

  Classification code:  603.1 Machine Tools, General  -  902.1 Engineering Graphics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.052 

  Database:  Compendex

 

16. Accession number:  20151300692622

  Title:  Quality improvement of potato slice by flowing electrolyte under magnetic field 

  Authors:  Jin, Yamei1 ; Yang, Na1 ; Duan, Xiang1 ; Jin, Zhengyu2 ; Xu, Xueming2   

  Author affiliation:  1  School of Food Science and Technology, Jiangnan University, Wuxi, China

 2  State Key Lab of Food Science and Technology, Jiangnan University, Wuxi, China 

  Corresponding author:  Xu, Xueming 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  234-239 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The Hall effect in a flowing electrolyte demonstrates the impact of a perpendicular magnetic field on positive and negative ion moving path in a velocity field, of which the essence is the application of Lorentz force in solution fluid. Potato slices were treated under a perpendicular magnetic field with impregnation solution fluid containing different concentration of calcium chloride, zinc gluconate and ascorbic acid. The results showed that a center magnetic flux density of 1500 Gs promoted the permeation of the target solute, and higher velocity of flowing electrolyte declined the effect of penetration for charged ions. The quality of potato slice was significantly improved at 0.05 m/s velocity treatment. In contrast, the quality of the control group was not changed. This method can also be used to achieve the fortification of minerals, keep crispness and prevent browning of other agricultural products.  

  Number of references:  20 

  Main heading:  Magnetism 

  Controlled terms:  Agricultural products  -  Ascorbic acid  -  Electrolytes  -  Magnetic fields  -  Negative ions  -  Superconducting tapes  -  Velocity  -  Zinc chloride 

  Uncontrolled terms:  Anti-browning  -  Control groups  -  Flowing electrolytes  -  Impregnation solution  -  Perpendicular magnetic fields  -  Potatoes  -  Quality improvement  -  Velocity field 

  Classification code:  701.2 Magnetism: Basic Concepts and Phenomena  -  708.3 Superconducting Materials  -  801 Chemistry  -  804 Chemical Products Generally  -  804.1 Organic Compounds  -  821.4 Agricultural Products  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.035 

  Database:  Compendex

 

17. Accession number:  20151300692620

  Title:  Physicochemical properties of enzyme and heat-moisture treated castanea henryi starches 

  Authors:  Xie, Tao1 ; Kang, Lingtao1 ; Tang, Zhenghui1 ; Yang, Chunfeng1 ; Gao, Juan1  

  Author affiliation:  1  College of Chemical Engineering, Hunan Institute of Engineering, Xiangtan, China 

  Corresponding author:  Xie, Tao 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  222-227 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Castanea henryi starches were treated by enzyme and heat-moisture and the effects of enzyme dosage and reaction time on their physicochemical properties were studied. The results demonstrated that crystal types of enzyme and heat-moisture treated starches belonged to type A, which were low expected glycemic index (pGI) foods because of most pGI below 55%. By analysis in vitro digestion dynamics, scanning electron microscope (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and high performance anion-exchange chromatography with pulsed ampere detection (HPAEC-PAD), the resistant starch (RS) content, molecular chain average degree of polymerization (DP), relative crystallinity and melting enthalpy of enzyme and heat-moisture treated starches along with the change of enzyme dosage and debranching time were characterized by three phases. Especially in the second phase, namely the enzyme dosage with 50~60 U/g and the reaction time within 12~16 h, the RS content, relative crystallinity and melting enthalpy were maximum due to the molecular chain of DP value suitable to reaggregate to form stable crystalline structure.  

  Number of references:  16 

  Main heading:  Enzymes 

  Controlled terms:  Differential scanning calorimetry  -  Enthalpy  -  Melting  -  Moisture  -  Phase transitions  -  Scanning electron microscopy  -  Starch  -  X ray diffraction 

  Uncontrolled terms:  Crystalline structure  -  Heat-moisture treatments  -  High-performance anion-exchange chromatography  -  In-vitro digestions  -  Melting enthalpy  -  Physicochemical property  -  Relative crystallinity  -  Resistant starch 

  Classification code:  531.1 Metallurgy  -  641.1 Thermodynamics  -  741.1 Light/Optics  -  801.4 Physical Chemistry  -  804.1 Organic Compounds  -  931.3 Atomic and Molecular Physics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.033 

  Database:  Compendex

 

18. Accession number:  20151300692595

  Title:  PIV experiment on flow instabilities in centrifugal pump 

  Authors:  Ren, Yun1 ; Wu, Denghao1 ; Liu, Houlin2 ; Jiang, Lanfang1  

  Author affiliation:  1  Zhijiang College, Zhejiang University of Technology, Hangzhou, China

 2  Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China 

  Corresponding author:  Ren, Yun 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  46-51 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  A centrifugal pump with specific speed of 74 was studied. Hydraulic performance test was done firstly, and the result showed that the head changed little with the flow reduced when flow was less than 18 m3/h. In order to research the flow instabilities under the above H-Q curve, PIV technique was adopted to discover the onset and development rule of unstable vortex within the impeller. The results showed that the flow was separated at 0.6QBEP, developed at 0.4QBEPand spread almost the whole impeller passage at 0.1QBEP. In addition, flow in the passage near the tongue was the most unstable, and the vortex was also occurred in this passage firstly by comparing with rest of passages. With the flow rate decreasing, the vortex on the pressure side was increased and converged to a large-size vortex which spread to the outlet of passage and moved to the centre area of the passage in the end.  

  Number of references:  14 

  Main heading:  Vortex flow 

  Controlled terms:  Centrifugal pumps  -  Impellers  -  Pumps 

  Uncontrolled terms:  Flow instabilities  -  Global performance  -  Hydraulic performance  -  Impeller passage  -  PIV  -  PIV techniques  -  Pressure side  -  Specific speed 

  Classification code:  601.2 Machine Components  -  618.2 Pumps  -  631.1 Fluid Flow, General 

  DOI:  10.6041/j.issn.1000-1298.2015.02.008 

  Database:  Compendex

 

19. Accession number:  20151300692612

  Title:  Property analysis of two-step anaerobic digestion of rice straw pretreated by dilute acid and dilute alkali 

  Authors:  Wang, Dianlong1 ; Ai, Ping1 ; Yan, Lieliang2 ; Yu, Liang3 ; Yan, Shuiping1 ; Zhang, Yanlin1  

  Author affiliation:  1  College of Engineering, Huazhong Agricultural University, Wuhan, China

 2  Jingmen Rural Energy Technical Extending Station, Jingmen, China

 3  Department of Biological System Engineering, Washington State University, Pullman, United States 

  Corresponding author:  Ai, Ping 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  168-175 and 180 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Based on two-step anaerobic fermentation process, this study compares the degradation feature of rice straw and the methane production potential of hydrolyzate under the conditions of dilute acid and dilute alkali pretreatment. In the HCl mass fraction range of 0.5%~2.5% (60), the hydrolyzates in the tests of 1.0% and 1.5% obtained higher COD mass concentration. During dilute acid hydrolysis, the hemicellulose fraction decreased significantly, and the glucose concentration was low. In the NaOH mass fraction of 0.5%~4.0%, the hydrolysis of rice straw was weak in the tests of 0.5% and 1.0%, while the hydrolysis efficiency in the tests of 2.0% and 3.0% was high. When the mass fraction of NaOH was higher than 2.0%, cellulose, hemicellulose and lignin all decreased, and degradation rate of lignin was the highest. The tests of acid and alkali could achieve good hydrolysis efficiency at weight-in-volume ratio of 7.5%. Used the hydrolyzate from acid and alkali pretreatment for acid and alkali pretreatment for methane production, the average gas production of unit COD mass were 631~906 mL/g from HCl hydrolyzate tests and 340~373 mL/g from NaOH hydrolyzate tests in five feeding periods. The biogas production rate of unit mass was less affected by concentration of feeding, and mainly affected by different methods of hydrolysis of acid and alkali. The types of anaerobic fermentation were different in the acid and alkali tests, and the process of generating volatile acid was more sufficient in the tests of acid hydrolyzates.  

  Number of references:  21 

  Main heading:  Anaerobic digestion 

  Controlled terms:  Cellulose  -  Degradation  -  Fermentation  -  Hydrolysis  -  Lignin  -  Methane  -  Testing 

  Uncontrolled terms:  Anaerobic fermentation  -  Anaerobic fermentation process  -  Biogas production rates  -  Dilute-acid hydrolysis  -  Glucose concentration  -  Hemicellulose fraction  -  Hydrolyzate  -  Lignocelluloses 

  Classification code:  423.2 Non Mechanical Properties of Building Materials: Test Methods  -  522 Gas Fuels  -  802.2 Chemical Reactions  -  815.1.1 Organic Polymers 

  DOI:  10.6041/j.issn.1000-1298.2015.02.025 

  Database:  Compendex

 

20. Accession number:  20151300692632

  Title:  Acceleration slip regulation based on extremum seeking control with sliding mode 

  Authors:  Zhou, Bing1 ; Xu, Meng1 ; Yuan, Xiwen1 ; Fan, Lu1  

  Author affiliation:  1  State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha, China 

  Corresponding author:  Zhou, Bing 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  307-311 and 342 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to improve the vehicle anti-slip performance, an acceleration slip regulation strategy based on extremum seeking control with sliding mode was proposed. Extremum seeking control with sliding mode was used as a self-optimizing way to find the extreme point of tire force-slip rate curve. In this condition, the tire slip ratio near the optimal slip ratio can be controlled without having to estimate the road surface friction coefficient or establishing the ideal reference model to improve the vehicle dynamic performance and directional stability. Moreover, a validated full vehicle simulation model was built in Matlab/Simulink. And the controller based on extremum seeking control with sliding mode was carefully designed. Finally, simulation results showed that during acceleration the vehicle can quickly reach the optimal slip ratio which corresponded to the real-time road conditions with the proposed control strategy. It implied that the proposed control strategy can improve vehicle dynamic performance.  

  Number of references:  20 

  Main heading:  Control theory 

  Controlled terms:  Airships  -  Friction  -  MATLAB  -  Roads and streets  -  Vehicle performance  -  Vehicles 

  Uncontrolled terms:  Acceleration slip regulations  -  Control strategies  -  Directional stability  -  Extremum seeking control  -  Road surface friction  -  Sliding modes  -  Vehicle dynamic performance  -  Vehicle simulation 

  Classification code:  406.2 Roads and Streets  -  432 Highway Transportation  -  652.5 Balloons and Gliders  -  663.1 Heavy Duty Motor Vehicles  -  731.1 Control Systems  -  921 Mathematics  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.045 

  Database:  Compendex

 

21. Accession number:  20151300692610

  Title:  Splash erosion under artificial rainfall in rocky mountain area of northern China 

  Authors:  Cheng, Jinhua1 ; Qin, Yue1 ; Zhang, Hongjiang1 ; Cong, Yue1 ; Yang, Fan1 ; Yan, Yongqing2  

  Author affiliation:  1  Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, Beijing Forestry University, Beijing, China

 2  Soil and Water Conservation Station of Beijing Yanqing County, Beijing, China 

  Corresponding author:  Cheng, Jinhua 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  153-161 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Raindrop-impact-induced erosion as the beginning of soil erosion had significant impact on the whole erosion process. In order to systematically understand the effect of rainfall characteristics on splash characteristics of Beijing, artificial rainfall experiment was conducted. Rainfall intensity, rainfall kinetic energy and duration of raining time were chosen to analyze the splash regulation. The characteristics of splash distance and fragment size distribution were also tested. The results of rainfall caused splash erosion indicated that during the splash erosion process, the quantity of splashed soil particles in down slope had a significantly larger amount than that of the up slope, while the quantity of up slope was the smallest of all the four directions. The amount of total splashed particles and net splashed particles were all positively related to rainfall intensity. Quantity of splashed soil particles was significantly positively correlated to rainfall intensity and rainfall kinetic energy, respectively. The quantity of splashed soil particles was exponentially increased with rainfall intensity. And a linear function could show the relationship between quantity of splashed soil particles and rainfall kinetic energy. The rate of total splashed soil particles decreased exponentially with duration of raining time. The splashed fragments distributed mainly in 0~10 cm of the study plot, which accounted 45.4%~57.75% of the total splash erosion, while that in 50~60 cm of the plot was less than 1.75%. The quantity of splashed particles was exponentially decreased with splash distance. The splashed fragment size distribution showed that fragments smaller than 2 mm were transported by raindrop impacts. The mass percentage of splashed soil particles with size of 0.02~0.05 mm and 0.05~0.2 mm was similar to that of the texted soil. The content of fragments with size less than 0.02 mm was higher than that of texted soil, while the content of fragments with size of 0.2~2 mm was lower. The mass percentage of particles with size of 0.05~0.2 mm was the most, while the mass percentage of particles with size less than 0.002 mm and size of 0.05~0.2 mm were the least. Theoretically, the quantity of splashed soil particles with certain fragment size distribution of soil reached the peak. The percentage of splashed soil particles with size less than 0.05 mm increased with rainfall intensity, and then almost kept the same. The percentage of splashed soil particles with size of 0.05~0.2 mm was negatively correlated with rainfall intensity. The percentage of splashed soil particles with size of 0.2~2 mm increased with rainfall intensity. Splashed fragment size distribution kept the same when rainfall intensity was large enough. The amount of five kinds of splashed soil particles were all exponentially decreased with splash distance with high correlationship respectively, which was the same as that of total amount of splashed soil particles. Mean size distribution decreased with splash distance under the same rainfall intensity. Mean size distribution was significantly higher under 121.4 mm/h rainfall intensity than other three rainfall intensities. The changing rate of mean size distribution was large in 0~30 cm from the study plot, and the changing rate decreased as the splash distance increased.  

  Number of references:  12 

  Main heading:  Rain 

  Controlled terms:  Drops  -  Erosion  -  Kinetic energy  -  Kinetics  -  Size distribution  -  Soils 

  Uncontrolled terms:  Artificial rainfall  -  Fragment size distribution  -  Linear functions  -  Rainfall characteristics  -  Rainfall intensity  -  Rainfall kinetic energy  -  Splash distances  -  Splash erosion 

  Classification code:  407 Maritime and Port Structures; Rivers and Other Waterways  -  423 Non Mechanical Properties and Tests of Building Materials  -  443.3 Precipitation  -  483 Soil Mechanics and Foundations  -  483.1 Soils and Soil Mechanics  -  931 Classical Physics; Quantum Theory; Relativity  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.023 

  Database:  Compendex

 

22. Accession number:  20151300692625

  Title:  FPAR monitoring model of winter wheat based on hyperspectral reflectance at different growth stages 

  Authors:  He, Jia1 ; Liu, Bingfeng1 ; Li, Jun1   

  Author affiliation:  1  College of Agronomy, Northwest A&F University, Yangling; Shaanxi, China 

  Corresponding author:  Li, Jun 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  261-269 and 275 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Hyperspectral remote sensing is an important technique to fulfill real-time monitoring for crop growth status based on its superior performance in acquiring vegetation canopy information rapidly and non-destructively. The objective of this study was to establish the best simulating accuracy and adaptability of wheat fraction of absorbed photosynthetically active radiation (FPAR) estimation model based on wheat canopy hyperspectral reflectance with different nitrogen or phosphorus application rate treatments, and to improve the forecast precision of the FPAR estimation model at different growth stages of dryland wheat on the Loess Plateau. The experiments were carried out during 2009-2014 at Northwest A&F University, Yangling, China. Different winter wheat (Triticum aestivum L.) varieties with stronge or weak drought resistance were chosen for the treatments in different years, nitrogen and phosphorus treatments included five nitrogen fertilizer application rates (0, 75, 150, 225 and 300 kg/hm2pure nitrogen, expressed as N) and four phosphorus application rates (0, 60, 120 and 180 kg/hm2P2O5, expressed as P), the FPAR and canopy hyperspectral reflectance of different varieties and fertilizer treatments were monitored at jointing, booting heading, grain filling and maturity stage, respectively. Then FPAR monitoring models at different growth stages of winter wheat were constructed by using correlation analysis, regression analysis and other methods. The results showed that the FPAR of wheat increased with nitrogen and phosphorus application rate increasing in different growth stages, there were significant differences among test cultivars. A good correlation relationship was presented between FPAR and canopy spectral reflectance at 670, 850 and 960 nm, and the sensitive band of the FPAR occurred mostly within visible and near-infrared spectrum. The correlations between soil adjusted vegetation index (SAVI), red edge normalized difference vegetation index (NDVI705), enhanced vegetation index (EVI), difference vegetation index (DVI) and ratio vegetation index (RVI) to FPAR were significant, and the range of correlation coefficient was 0.818~0.942 at jointing, booting, heading, filling and maturity stages. Monitoring models based on SAVI, NDVI705, EVI, RVI and RVI produced better estimation for FPAR at different growth stages, and the determination coefficients (R2) were 0.854, 0.888, 0.811, 0.844 and 0.911, and the standard errors (SE) were 0.054, 0.032, 0.044, 0.047 and 0.044, accordingly. Meanwhile, comparing the predicted value with measured value to verify reliability and applicability of monitoring model, result showed that the relative errors (RE) between measured value and predicted value were 14.1%, 17.4%, 12.8%, 18.8%, 10.7%, and the root mean square errors (RMSE) were 0.139, 0.146, 0.136, 0.158, 0.130, respectively. Therefore, it was suggested the vegetation indices of SAVI, NDVI705, EVI, RVI and RVI was the most suitable model for monitoring winter wheat FPAR at jointing, booting, heading, filling and maturity stages, respectively, and there was higher prediction precision with different vegetation indices in monitoring FPAR of winter wheat at different growth stages, and different N and P rates. These conclusions had important implications for the large areas FPAR monitoring of winter wheat in the Loess Plateau. Meanwhile, there was a higher prediction accuracy of monitoring model based on the different vegetation indices at different growth stages.  

  Number of references:  36 

  Main heading:  Vegetation 

  Controlled terms:  Crops  -  Errors  -  Fertilizers  -  Filling  -  Forecasting  -  Forestry  -  Infrared devices  -  Landforms  -  Mean square error  -  Monitoring   -  Near infrared spectroscopy  -  Nitrogen  -  Nitrogen fertilizers  -  Phosphorus  -  Plants (botany)  -  Reflection  -  Regression analysis  -  Remote sensing  -  Sediments 

 

 Uncontrolled terms:  Canopy spectral reflectance  -  FPAR  -  Hyperspectral remote sensing  -  Monitoring models  -  Normalized difference vegetation index  -  Photosynthetically active radiation  -  Winter wheat  -  Winter wheat (Triticum aestivum L.) 

  Classification code:  461.9 Biology  -  481.1 Geology  -  483 Soil Mechanics and Foundations  -  691.2 Materials Handling Methods  -  711 Electromagnetic Waves  -  731.1 Control Systems  -  741.3 Optical Devices and Systems  -  804 Chemical Products Generally  -  821.0 Woodlands and Forestry  -  821.4 Agricultural Products  -  922.2 Mathematical Statistics  -  941 Acoustical and Optical Measuring Instruments  -  942 Electric and Electronic Measuring Instruments  -  943 Mechanical and Miscellaneous Measuring Instruments  -  944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments 

  DOI:  10.6041/j.issn.1000-1298.2015.02.038 

  Database:  Compendex

 

23. Accession number:  20151300692630

  Title:  Trajectory properties of automated guided vehicle with sneak traction 

  Authors:  Qian, Xiaoming1 ; Wu, Bin1 ; Wu, Xing1 ; Lou, Peihuang1   

  Author affiliation:  1  College of Mechanical and Electric Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China 

  Corresponding author:  Lou, Peihuang 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  294-300 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The drive unit and vehicle frame of traditional automated guided vehicle (AGV) and tractor-trailer were rigid coupling. Being different form the traditional machines, the drive unit and vehicle frame of AGV with sneak traction were flexible connection and the drive unit was used to drive the vehicle frame. To solve the problem of vehicle frame trajectory, a kinematic model was built to study the relationship between position posture of vehicle frame and the tracking path. According to geometric parameters of vehicle frame and central angle and radius of circular arc path, position posture of vehicle frame in world coordinate system was deduced. To solve the problem of AGV load driving, a dynamic model of AGV frame was built. The condition ignoring the effects of lateral force was calculated and the angular acceleration of the frame was deduced. Position posture tests proved that the kinematics model of AGV frame was correct. The results of dynamic property tests proved that the driving stability of AGV with this structure was excellent. The study results can provide the basis for improving the control performance of control system.  

  Number of references:  17 

  Main heading:  Automobile frames 

  Controlled terms:  Airships  -  Automation  -  Kinematics  -  Mobile robots  -  Tracking (position)  -  Transportation  -  Vehicles 

  Uncontrolled terms:  Angular acceleration  -  Automated guided vehicles  -  Control performance  -  Dynamic property  -  Dynamic property test  -  Flexible connections  -  Kinematics modeling  -  World coordinate systems 

  Classification code:  432 Highway Transportation  -  652.5 Balloons and Gliders  -  663.2 Heavy Duty Motor Vehicle Components  -  716.2 Radar Systems and Equipment  -  731 Automatic Control Principles and Applications  -  732 Control Devices  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.043 

  Database:  Compendex

 

24. Accession number:  20151300692611

  Title:  Practicability and scientificalness verification of surface water spatial distribution diversity 

  Authors:  Duan, Jinlong1 ; Li, Weidong1 ; Zhang, Xuelei2   

  Author affiliation:  1  College of Information Science and Engineering, Henan University of Technology, Zhengzhou, China

 2  Institute of Natural Resources and Eco-environment, Zhengzhou University, Zhengzhou, China 

  Corresponding author:  Zhang, Xuelei 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  162-167 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  There is a significant spatial imbalance in the water resources distribution in China and the study on it is very important for the sustainable use of natural resources and rational distribution of agricultural structure. A typical research area in central Henan Province is selected for a correlative analysis about surface water distribution characteristic between the traditional indices (water perimeter, water area and drainage density) and the new water spatial distribution diversity methodology. Results show that there is a significant positive relationship among these four indices with the average coefficient of determination (R2) of 0.89 when the regional water is predominated by rivers or such linear surface water types, and in this situation each of these indices is suitable. However, when the regional water is predominated by rivers, lakes, reservoirs and such complex surface water types, the newest index 'water spatial distribution diversity' performs better and should be chosen in describing the water spatial distribution characteristic.  

  Number of references:  15 

  Main heading:  Surface waters 

  Controlled terms:  Reservoirs (water)  -  Spatial distribution  -  Water resources  -  Water supply systems 

  Uncontrolled terms:  Coefficient of determination  -  Complex surface  -  Correlative analysis  -  Distribution characteristics  -  Drainage density  -  Henan Province  -  Pedodiversity  -  Water distributions 

  Classification code:  441.2 Reservoirs  -  444 Water Resources  -  444.1 Surface Water  -  446.1 Water Supply Systems  -  921 Mathematics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.024 

  Database:  Compendex

 

25. Accession number:  20151300692604

  Title:  Spatial and temporal variation of soil nutrient and nutrient balance status in weibei rainfed highland 

  Authors:  Liu, Fen1 ; Wang, Xiaoying1 ; Zhao, Yeting1 ; Tong, Yan'an1, 2   

  Author affiliation:  1  College of Natural Resources and Environment, Northwest A&F University, Yangling; Shaanxi, China

 2  Key Laboratory of Plant Nutrition and the Agri-environment in Northwest, Ministry of Agriculture, Yangling; Shaanxi, China 

  Corresponding author:  Tong, Yan'an 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  110-119 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Better understanding of soil fertility and nutrient balance in soil-crop systems is important for rational fertilization, refining agricultural management practices and improving utilization efficiency of water, soil and fertilizer resources. Traditional statistics, geostatistics combined with GIS technology were used to evaluate the spatial and temporal variability of soil organic matter (OM), available nitrogen (AN), available phosphorus (AP) and available potassium (AK) in Weibei rainfed highland from the 1980s to 2010-2012 based on the data from the second national soil survey and the cultivated land productivity investigation and quality evaluation project. Meanwhile, the current situation of fertilization and nutrient balance in main cropping systems was analyzed based on the information from household surveys of the national soil testing and fertilizer recommendation project during 2010 to 2012. The results indicated that the current average contents of OM, AN, AP and AK in soil were 12.9 g/kg, 59.4 mg/kg, 15.4 mg/kg and 164.2 mg/kg, respectively. Compared with 1980s, the OM, AN and AP contents in soil have been increased by 22.0%, 37.9% and 129.8%, respectively, and AK kept stable. Compared with the rational fertilizer application rates, the ratios of households using excessive nitrogen (N) inputs in wheat, maize and apple were 89%, 69% and 74%, and the ratios for phosphorus (P) were 75%, 49% and 52%, respectively. The ratios of households using insufficient potassium (K) inputs in wheat and maize were much higher, which were 76% and 67%, respectively. Meanwhile, the ratios of households using excessive and insufficient K inputs in apple were 40% and 48%, respectively. Significant surpluses of N and P in wheat, maize and apple cropping systems were observed, with an average of 116, 111 and 655 kg/hm2for N, 88, 56 and 357 kg/hm2for P, respectively. N and P practical surplus rates were much higher than their permissible surplus rates, indicating that N and P surpluses in this area were greatly exceeded their rational ranges. K was in deficit in wheat and maize cropping systems, with an average deficit of 73 and 93 kg/hm2respectively, which were both within their permissible scopes. K was in surplus in apple cropping system, with an average of 283 kg/hm2which was 145 percentage points higher than its permissible surplus rate. From the perspective of food safety and environmental protection, inputs of N and P in this area should be reduced. By contrast, input of K should be increased to maintain high and stable cereal crop yields.  

  Number of references:  36 

  Main heading:  Soil testing 

  Controlled terms:  Agriculture  -  Crops  -  Fertilizers  -  Fruits  -  Nitrogen  -  Nitrogen fertilizers  -  Nutrients  -  Phosphorus  -  Potassium  -  Quality control   -  Soil surveys  -  Soils 

  Uncontrolled terms:  Agricultural management practice  -  Fertilizer applications  -  Nutrient balance  -  Rainfed  -  Soil nutrients  -  Spatial and temporal variability  -  Spatial and temporal variation  -  Utilization efficiency 

  Classification code:  483.1 Soils and Soil Mechanics  -  549.1 Alkali Metals  -  804 Chemical Products Generally  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  913.3 Quality Assurance and Control 

  DOI:  10.6041/j.issn.1000-1298.2015.02.017 

  Database:  Compendex

 

26. Accession number:  20151300692627

  Title:  Detection of laying hens vocalization based on power spectral density 

  Authors:  Cao, Yanfei1 ; Chen, Hongqian1, 2 ; Teng, Guanghui1 ; Zhao, Shumei1 ; Li, Qiaowei1  

  Author affiliation:  1  College of Water Resources and Civil Engineering, China Agricultural University, Beijing, China

 2  Network Center, China Agricultural University, Beijing, China 

  Corresponding author:  Teng, Guanghui 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  276-280 and 300 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The purpose of this paper is to develop a method for automatically detecting vocalizations of laying hens from a large amount of original data. First, the original sound data were cut into 1 sec of length clips by using sound analysis software. Then, 130 clips including calls of Hy-Line Brown laying hens and 132 fan noise fragments were selected. Finally, an algorithm was developed for automatically identifying vocalization of laying hens and fan noise based on the discrepancies of 2 kinds of sounds' power spectral density in 1000~1500 Hz. The results showed that a 95% overall correct classification ratio was achieved and 93.3% of the vocalizations of laying hens were correctly identified. This approach can improve the efficiency during sound analysis and reduce the storage and transmission of useless sound.  

  Number of references:  24 

  Main heading:  Acoustic noise 

  Controlled terms:  Digital storage  -  Fans  -  Power spectral density  -  Spectral density 

  Uncontrolled terms:  Correct classification ratios  -  Fan noise  -  Frequency  -  Large amounts  -  Laying hens  -  Sound analysis  -  Sound data  -  Sound recognition 

  Classification code:  618.3 Blowers and Fans  -  711 Electromagnetic Waves  -  722.1 Data Storage, Equipment and Techniques  -  751.4 Acoustic Noise  -  921 Mathematics  -  941 Acoustical and Optical Measuring Instruments 

  DOI:  10.6041/j.issn.1000-1298.2015.02.040 

  Database:  Compendex

 

27. Accession number:  20151300692590

  Title:  An accurate segmentation approach for disease and pest based on texture difference guided DRLSE 

  Authors:  Zhao, Yaochi1 ; Hu, Zhuhua1 ; Bai, Yong1 ; Cao, Fengqin2  

  Author affiliation:  1  College of Information Science & Technology, Hainan University, Haikou, China

 2  College of Environment and Plant Protection, Hainan University, Haikou, China 

  Corresponding author:  Hu, Zhuhua 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  14-19 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to accurately segment diseases and insect pests on crop leaves, a Gaussian mixture model (GMM) based texture difference expression method and an accurate segmentation approach based on improved distance regularized level set evolution (DRLSE) were proposed. Considering that crop leaf generally has a certain texture feature, GMM was used to characterize the leaves texture feature, and improved DRLSE which took full advantage of texture difference information between objects and background, was employed to get the accurate contour of diseases and insect pests. Firstly, the texture feature of leaf sampling area was modeled by using GMM. Secondly, the texture difference between the pixels in the diseases and insect pests' area and the sampling area was calculated, and the texture difference image was obtained at the same time. Thirdly, the initial contour for DRLSE was obtained by Otsu and morphologic post processing. Finally, the contour of diseases and insect pests was evolved accurately with texture difference guided DRLSE. The experimental results show that the diseases and pest contour can be obtained accurately with the introduced method and also can provide the basis for the subsequent identification and prevention of crop diseases and pests.  

  Number of references:  20 

  Main heading:  Image texture 

  Controlled terms:  Crops  -  Image segmentation  -  Numerical methods  -  Textures 

  Uncontrolled terms:  Active contour model  -  Difference images  -  Gaussian Mixture Model  -  Improved distance  -  Insect pest  -  Level-set evolution  -  Post processing  -  Texture features 

  Classification code:  723.2 Data Processing and Image Processing  -  821.4 Agricultural Products  -  921.6 Numerical Methods  -  933 Solid State Physics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.003 

  Database:  Compendex

 

28. Accession number:  20151300692598

  Title:  Effects of compound application of organic and chemical fertilizers on growth, quality of tea plants and soil nutrient 

  Authors:  Li, Pingping1, 2 ; Lin, Yongfeng1, 3 ; Hu, Yongguang1, 3   

  Author affiliation:  1  Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang, China

 2  College of Biology and the Environment, Nanjing Forestry University, Nanjing, China

 3  School of Agricultural Equipment Engineering, Jiangsu University, Zhenjiang, China 

  Corresponding author:  Hu, Yongguang 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  64-69 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  To test the effects of compound application of organic and chemical fertilizers on tea plants, five treatments of compound fertilizer mixed with organic vinegar residue fertilizer and chemical fertilizer were set to study their influence on tea growth, yield and quality, and soil nutrient as well. The treatments were set as organic fertilizer of 100% (100% O), chemical fertilizer of 100% (100% C), 70% O+30% C, 50% O+50% C, 30% O+70% C and no fertilizer as control (CK). The result showed that all the fertilization treatments contributed to tea yield and quality and soil nutrient contents, but the effects varied with different treatments. The treatment of 70% O+30% C was the most significant in yield increase, which was 276.91%, the treatment of 30% O+70% C was the second and the treatment of 50% O+50% C was in the middle; the growth indexes such as the length of new shoot, leaf area, 100-bud weight and bud density, and the quality indexes such as tea polyphenols, amino acid, caffeine and water extract were also the highest when the treatment of 70% O+30% C was applied. The more organic fertilizer was applied, the more alkali-hydro nitrogen, available phosphorus and available potassium were increased in the soil of tea fields, and the treatment of 100% O ranked the first place and the treatment of 70% O+30% C took the second place, between which there was no significant difference. Comprehensive analysis showed that the treatment of 70% O+30% C was optimal and worthy of application in tea fields.  

  Number of references:  19 

  Main heading:  Fertilizers 

  Controlled terms:  Amino acids  -  Image quality  -  Nitrogen fertilizers  -  Nutrients  -  Soils 

  Uncontrolled terms:  Available phosphorus  -  Available potassiums  -  Chemical fertilizers  -  Comprehensive analysis  -  Different treatments  -  Soil nutrients  -  Tea plants  -  Yield 

  Classification code:  461 Bioengineering and Biology  -  461.9 Biology  -  483.1 Soils and Soil Mechanics  -  741 Light, Optics and Optical Devices  -  804 Chemical Products Generally 

  DOI:  10.6041/j.issn.1000-1298.2015.02.011 

  Database:  Compendex

 

29. Accession number:  20151300692597

  Title:  Cavitation characteristics of centrifugal pump near wear-ring clearance 

  Authors:  Huang, Xianbei1 ; Liu, Zhuqing1 ; Yang, Wei1  

  Author affiliation:  1  College of Water Resources and Civil Engineering, China Agricultural University, Beijing, China 

  Corresponding author:  Liu, Zhuqing 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  59-63 and 58 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to clarify the cavitation near the clearance outlet, firstly, the detailed dependence checks were done to ensure the calculation accuracy. Based on these, the unsteady calculations including cavitation were done and the cavitation near the clearance outlet under NPSHr condition was predicted. Results showed that the static pressure presented a periodical non-uniform distribution with frequency of 2.27 times of the rotation frequency due to the rotation effects near the wear-ring. The cavitation occurred at the low-pressure region which located at the circle whose center was the center of the inlet pipe and the radius was slightly smaller than the intersection radius of the inlet pipe and the wear-ring outlet. The pressure pulsation near the wear-ring outlet was influenced by the impeller rotation and cavitation, it had two kinds of frequency, the first one was the blade passing frequency and it's multiple, the second one was caused due to the periodic changes of cavitation and the frequency was an integral multiple of cavitation frequency. The conclusion was helpful to get a better understanding of the cavitation characteristics in the centrifugal pump near the wear-ring clearance.  

  Number of references:  17 

  Main heading:  Cavitation 

  Controlled terms:  Centrifugal pumps  -  Computational fluid dynamics  -  Pumps 

  Uncontrolled terms:  Blade passing frequency  -  Calculation accuracy  -  Cavitation characteristics  -  Integral multiples  -  Non-uniform distribution  -  Pressure pulsation  -  Rotation frequencies  -  Wear ring 

  Classification code:  618.2 Pumps  -  631.1.1 Liquid Dynamics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.010 

  Database:  Compendex

 

30. Accession number:  20151300692600

  Title:  Simulating effects of nitrogen on leaf area index of cotton under mulched drip irrigation 

  Authors:  Jia, Biao1 ; Qian, Jin1 ; Ma, Fuyu2   

  Author affiliation:  1  School of Agriculture, Ningxia University, Yinchuan, China

 2  College of Agriculture, Shihezi University, Shihezi, China 

  Corresponding author:  Ma, Fuyu 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  79-87 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to investigate the dynamic relationship of cotton between leaf area index (LAI) and accumulated total production of thermal effectiveness and photosynthetically active radiation (TEP), plot experiments were conducted with Shiza2 cultivar and Xinluzao43 cultivar and four nitrogen levels were imposed. The dynamic changes of LAI and TEP of the whole growth period in four nitrogen levels were quantificationally analyzed according to normalization process, and relative LAI (RLAI) and relative TEP (RTEP) were dynamically simulated using the Curve Expert. The results indicated that eight analog models showed a better fitting effect and the rational function model which had strong biological significance and a high determination coefficient (R2=0.895) can be more accurate to describe the cotton LAI dynamic correlation than others. The model was checked out with five nitrogen levels from field tests and three different ecological points separated with the high-yield field trials, the verification results showed that the confidence α were 0.169, 0.077, 0.171; determination coefficient R2were 0.948, 0.964, 0.971; consistency coefficient CC were 0.987, 0.991, 0.989; relative error RE were 6.493%, 4.371%, 7.540%; root mean square error RMSEwere 0.188, 0.143 and 0.227 m2/m2. The results indicated that the RLAI dynamic model based RTEP description can accurately reflect the dynamic changes in the cotton groups. Further analysis of the effect of regulation and control of cotton groups LAI characteristics parameters of different nitrogen levels showed that the nitrogen usage amount affected the whole groups LAI dynamic regulation, especially the mean LAI; maximum LAI and ratio of the two characteristic parameters. It could be important indicators of improving the cotton leaf blade photosynthetic characteristics and the production.  

  Number of references:  22 

  Main heading:  Dynamic models 

  Controlled terms:  Cotton  -  Irrigation  -  Mean square error  -  Nitrogen  -  Plants (botany)  -  Radiation effects  -  Rational functions 

  Uncontrolled terms:  Characteristics parameters  -  Determination coefficients  -  Leaf Area Index  -  Mulched drip irrigations  -  Normalized  -  Photosynthetic characteristics  -  Photosynthetically active radiation  -  Rational function model 

  Classification code:  461.9 Biology  -  711 Electromagnetic Waves  -  731.1 Control Systems  -  744 Lasers  -  804 Chemical Products Generally  -  821.3 Agricultural Methods  -  821.4 Agricultural Products  -  921 Mathematics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.013 

  Database:  Compendex

 

31. Accession number:  20151300692626

  Title:  Farmland linear project feature auto-extraction method based on canny algorithm 

  Authors:  Zhang, Chao1, 2 ; Wang, Zhihao1 ; Yang, Jianyu1, 2 ; Zhu, Dehai1, 2  

  Author affiliation:  1  College of Information and Electrical Engineering, China Agricultural University, Beijing, China

 2  Key Laboratory for Agricultural Land Quality and Monitoring, Ministry of Land and Resources, Beijing, China 

  Corresponding author:  Zhang, Chao 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  270-275 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Farmland roads and ditches are the majority of land consolidation project and construction of a high standard of basic farmland, which can be monitored by the high spatial resolution remote sensing. An approach of automatic linear project feature extraction with WorldView -2 high-resolution image based on Canny edge detection algorithm was presented, which was designed especially for field roads and ditches detection in the farmland. Firstly, based on the Canny edge binary images, single-pixel gap was connected by matching one of eight masks summarized. Secondly, the suspect linear feature was identified by Euclidean distance judgment. Each pixel of enhanced images was scanned with the seed growth method. Thirdly, each line was joined into the intact linear project feature with a lower length threshold. Fourthly, redundant features were deleted with a higher length threshold. The steps listed above were divided into two directions including vertical direction and horizontal direction and the final results were formed by combining results from the two directions. Experiments were designed in the land consolidation area of Dalad Banner, Inner Mongolia. The accuracy assessment was presented, the precision was above 95% and the correctness in the simple conditions was above 95%, which also met the basic needs of land consolidation project monitoring. Based on Canny edge detection, the algorithm of this paper can be realized in a fast and efficient way. All the procedures of this algorithm were realized automatically by adjusting operators without requiring artificial interpretation.  

  Number of references:  17 

  Main heading:  Edge detection 

  Controlled terms:  Algorithms  -  Binary images  -  Extraction  -  Farms  -  Feature extraction  -  Image matching  -  Pixels  -  Remote sensing 

  Uncontrolled terms:  Auto extractions  -  Canny  -  High resolution remote sensing  -  Land consolidations  -  Linear projects 

  Classification code:  716 Telecommunication; Radar, Radio and Television  -  723 Computer Software, Data Handling and Applications  -  731.1 Control Systems  -  802.3 Chemical Operations  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  921 Mathematics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.039 

  Database:  Compendex

 

32. Accession number:  20151300691898

  Title:  Thermal error modeling of CNC machine tool based on partial least squares and improved core vector regression 

  Authors:  Yu, Wenli1 ; Yao, Xinhua2 ; Sun, Lei2 ; Fu, Jianzhong2  

  Author affiliation:  1  College of Information Engineering, Quzhou College of Technology, Quzhou, China

 2  Department of Mechanical Engineering, Zhejiang University, Hangzhou, China 

  Corresponding author:  Yao, Xinhua 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  357-364 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Support vector regression (SVR) is an effective tool for machine error modeling. To improve the predicted performance of SVR model, the core vector regression (CVR) algorithm which is suitable for resolving the training of large-scale sample data was introduced into thermal error modeling for CNC machine tool. Principal components were firstly extracted from the sample set using the feature extraction of partial least squares (PLS) algorithm to construct the feature set, which would reduce the number of state variables without information loss by dimension reduction, data de-noising and eliminating the correlative between variables. Then improved particle swam optimization (IPSO) was applied for determining the parameters of CVR to get the optimal performance of the thermal error model, and the proposed combined method was called PLS-IPSO-CVR. Experimental results showed that the training speed of PLS-IPSO-CVR model was much faster and it produced fewer support vectors on very large sample data in comparison with SVR and BP neural network. Thus the feasibility and effectiveness of this combined modeling method was verified.  

  Number of references:  19 

  Main heading:  Machine tools 

  Controlled terms:  Computer control systems  -  Extraction  -  Feature extraction  -  Least squares approximations  -  Machinery  -  Neural networks  -  Principal component analysis  -  Regression analysis  -  Vectors 

  Uncontrolled terms:  CNC machine  -  Core vector regression  -  Partial least square (PLS)  -  Particle Swam Optimization  -  Thermal error modeling 

  Classification code:  601 Mechanical Design  -  603.1 Machine Tools, General  -  716 Telecommunication; Radar, Radio and Television  -  723.4 Artificial Intelligence  -  731.1 Control Systems  -  802.3 Chemical Operations  -  921.1 Algebra  -  921.6 Numerical Methods  -  922.2 Mathematical Statistics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.053 

  Database:  Compendex

 

33. Accession number:  20151300692602

  Title:  Effects of different degradable films mulching on soil water potential, temperature and sunflower growth 

  Authors:  Li, Xianyue1 ; Peng, Zunyuan1 ; Shi, Haibin1 ; Yan, Jianwen1 ; Wang, Zhichao1  

  Author affiliation:  1  Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Huhhot, China 

  Corresponding author:  Shi, Haibin 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  97-103 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  With the large application of agricultural plastic film, the residual of plastic film was continuously increased in soil during the last few decades. The application of biodegradable film could solve the environmental pollution because of its totally degradable property. Agricultural film was specially required in arid and cold region, so it was very important to study and get the suitable degradable film for sustainable agricultural development. Five treatments including plastic film, biodegradable film (thickness 0.012 mm), biodegradable film (thickness 0.008 mm), liquid film and no film (CK) were used to compare the effects of different types of film on soil temperature, soil water potential, crop growth and yield. The results showed that there were no significant differences between plastic film and biodegradable film treatments during early crop growing period (June and July), whereas the soil temperature in 0~20 cm soil layer for the treatments of biodegradable film was a little lower than plastic film treatment because of film's degradation, especially for the treatment of biodegradable film of thickness 0.008 mm during the end of crop growth. However, the soil temperatures of liquid film and no film treatments were obviously lower than plastic film treatment. The results for soil water potential among different treatments were similar, and it was very close between plastic film and biodegradable film treatments, but the maximum soil water potential was shown in 0~20 cm soil layer during the end of September, and there was significant difference between plastic film and biodegradable film treatments (p<0.05). No significant differences were found between plastic film and biodegradable film treatments for the crop height, leaf area index (LAI), dry matter of leaf, stem, flower dish and yield. However, both of these two treatments were clearly better than liquid film and no film treatments. Thus, it was feasible to replace plastic film with biodegradable film for mulching in arid and cold region.  

  Number of references:  20 

  Main heading:  Film growth 

  Controlled terms:  Agriculture  -  Biodegradable polymers  -  Crops  -  Cultivation  -  Forestry  -  Liquid films  -  Liquids  -  Plastic films  -  Soil moisture  -  Soils   -  Temperature 

  Uncontrolled terms:  Agricultural plastic films  -  Biodegradable film  -  Crop growth and yields  -  Degradable  -  Environmental pollutions  -  Soil temperature  -  Soil water potential  -  Sustainable agricultural development 

  Classification code:  454 Environmental Engineering  -  483.1 Soils and Soil Mechanics  -  641.1 Thermodynamics  -  712.1 Semiconducting Materials  -  817.1 Polymer Products  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  931.2 Physical Properties of Gases, Liquids and Solids 

  DOI:  10.6041/j.issn.1000-1298.2015.02.015 

  Database:  Compendex

 

34. Accession number:  20151300692596

  Title:  Analysis on pressure characteristics during internal unsteady flow in double volute centrifugal pump 

  Authors:  Zhang, Fan1 ; Yuan, Shouqi1 ; Fu, Qiang1 ; Hong, Feng1 ; Tao, Yi1  

  Author affiliation:  1  National Research Center of Pumps, Jiangsu University, Zhenjiang, China 

  Corresponding author:  Zhang, Fan 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  52-58 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to analyze the internal flow characteristics of a double volute centrifugal pump, the CFD software CFX was applied to simulate the unsteady flow among different working conditions based on standard k-Ε turbulence model and standard no slip mesh model. The pressure fluctuation characteristics under different working conditions on flow channels both in the impeller and the volute were obtained. The results showed that pressure pulsation of each monitoring point was relatively large and uniform under the condition of low flow rate. Pressure fluctuation near the edge of impeller outlet was 5~8 times stronger than that in other region of the impeller. In the case of rotating 30 steps (90°) and 90 steps (270°) during four working conditions, the value of pressure reached to maximum. Pressure fluctuation in the inner flow passage was stronger than that in the outer flow passage of the double volute, and it reached to maximum in the tongue of the double volute. The pressure fluctuation decreased firstly and then increased near the tongue and outlet of volute in the large flow rate due to a certain back-flow. It can be concluded from fast Fourier transform that the frequency of the impeller and its multiples were main frequencies of pressure fluctuation which presented a decreasing tendency.  

  Number of references:  17 

  Main heading:  Computational fluid dynamics 

  Controlled terms:  Centrifugal pumps  -  Fast Fourier transforms  -  Flow rate  -  Impellers  -  Pumps  -  Turbulence models  -  Unsteady flow 

  Uncontrolled terms:  Double volute  -  Internal flow characteristics  -  Internal unsteady flow  -  Large flow rate  -  Monitoring points  -  Pressure characteristics  -  Pressure fluctuation  -  Pressure pulsation 

  Classification code:  601.2 Machine Components  -  618.2 Pumps  -  631 Fluid Flow  -  921.3 Mathematical Transformations  -  921.6 Numerical Methods 

  DOI:  10.6041/j.issn.1000-1298.2015.02.009 

  Database:  Compendex

 

35. Accession number:  20151300692629

  Title:  Interconnected hydraulic torsion-elimination suspension systemw 

  Authors:  Wang, Ruochen1 ; Wu, Tao1 ; Meng, Xiangpeng1 ; Huang, Huan1 ; Chen, Long1  

  Author affiliation:  1  School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang, China 

  Corresponding author:  Wang, Ruochen 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  288-293 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  According to the principle of suspension constrained minimization, an interconnected hydraulic torsion-elimination suspension system was put forward. Firstly, the structure and principle of the system was introduced, the interconnected hydraulic torsion elimination suspension system was set up in the AMESim and the vehicle dynamic model was established with Matlab/Simulink. Co-simulation based on Matlab/Simulink and AMESim was carried out to analyze the dynamic performance of interconnected hydraulic torsion-elimination suspension system. The principle prototype of interconnected hydraulic torsion-elimination suspension system was designed and its bench test was performed. Simulation and experimental results were basically identical. The results showed that compared with the traditional passive suspension, interconnected hydraulic torsion-elimination suspension can effectively inhibit the body vibration, control the body posture and coordinate the vehicle riding comfort and safety, improve vehicle passing ability in extreme condition, eliminate part of the body torsion load and perform the real time control of vehicle steering characteristics.  

  Number of references:  18 

  Main heading:  Suspensions (components) 

  Controlled terms:  Airships  -  Automobile bodies  -  Automobile suspensions  -  Constrained optimization  -  MATLAB  -  Real time control  -  Steering  -  Testing  -  Torsional stress  -  Vehicles   -  Vibrations (mechanical) 

  Uncontrolled terms:  Constrained minimization  -  Dynamic performance  -  Extreme conditions  -  Passing ability  -  Passive suspension  -  Riding comfort  -  Steering characteristics  -  Vehicle dynamic model 

  Classification code:  421 Strength of Building Materials; Mechanical Properties  -  423.2 Non Mechanical Properties of Building Materials: Test Methods  -  432 Highway Transportation  -  601.2 Machine Components  -  632.1 Hydraulics  -  652.5 Balloons and Gliders  -  663.2 Heavy Duty Motor Vehicle Components  -  731 Automatic Control Principles and Applications  -  732 Control Devices  -  921 Mathematics  -  931.1 Mechanics  -  961 Systems Science 

  DOI:  10.6041/j.issn.1000-1298.2015.02.042 

  Database:  Compendex

 

36. Accession number:  20151300692616

  Title:  Isolation and Purification Method of Membrane-bound Polyphenol Oxidase in Fuji Apple 

  Authors:  Liu, Fang1 ; Gan, Zhilin1 ; Zhao, Jinhong1 ; Wen, Xin1 ; Ni, Yuanying1   

  Author affiliation:  1  College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China 

  Corresponding author:  Ni, Yuanying 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  193-197 and 246 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Enzymatic browning was mainly associated with polyphenol oxidases which were able to act with phenolic compounds in the presence of molecular oxygen and decreased the commercial quality, organoleptic acceptance and nutritional value of the product. Membrane-bound polyphenol oxidase (mPPO) in Fuji apple (Malus domestica Borkh. cv. Red Fuji) was purified by using temperature-induced phase partitioning technique, ammonium sulfate fractional precipitation and DEAE Sepharose Fast Flow ion exchange column chromatography, and analyzed by using tandem mass spectrometry (LC-MS/MS). The best conditions for isolation and purification were ultrasonic extraction for 10 min, 50%~80% saturation of ammonium sulfate precipitation, and gradient elution with 0.1 mol/L NaCl. The mPPO was purified by 64.30 folds with a high specific activity (387032.97 U/mg). The Native-PAGE and SDS-PAGE were single bands for mPPO and the purified mPPO was a dimmer of a subunit with a molecular weight of 67 kDa. The results by mass spectrometry analysis and comparison in protein database showed that the purified protein was a polyphenol oxidase.  

  Number of references:  16 

  Main heading:  Column chromatography 

  Controlled terms:  Chromatography  -  Fruits  -  Ion exchange  -  Mass spectrometry  -  Molecular oxygen  -  Proteins  -  Purification  -  Spectrometry  -  Ultrasonic applications 

  Uncontrolled terms:  Fuji apple  -  Isolation and purification  -  Membrane-bound  -  Polyphenol oxidase  -  Specific activity 

  Classification code:  753.3 Ultrasonic Applications  -  801 Chemistry  -  801.4 Physical Chemistry  -  802.2 Chemical Reactions  -  802.3 Chemical Operations  -  804.1 Organic Compounds  -  804.2 Inorganic Compounds  -  821.4 Agricultural Products 

  DOI:  10.6041/j.issn.1000-1298.2015.02.029 

  Database:  Compendex

 

37.  Accession number:  20151300692633

  Title:  Relationship between back pressure and suction ability of pneumatic ejector system 

  Authors:  Guo, Zhonghua1 ; Li, Xiaoning1 ; Toshiharu, Kagawa2  

  Author affiliation:  1  School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, China

 2  Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Japan 

  Corresponding author:  Guo, Zhonghua 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  312-315 and 350 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Pneumatic ejector is an important vacuum source for agricultural automation. During the application of pneumatic ejector, the increasing back pressure may cause the suction ability to get worse intensely and the normal operation of the system will be greatly influenced. Regarding the ejectors used in pneumatic systems, the air flow was analyzed with finite volume method based on ejector inner mechanical structural parameters. The changes of pressure distribution and suction flow velocity were studied when the back pressure was variable. Based on the theoretical analysis, an experimental apparatus was set up and the suction mass flow rate was measured as the back pressure increased. The relationship between back pressure and suction mass flow rate was obtained. Judging from both of theoretical analysis and experimental result, the suction flow-rate characteristics remained unchanged at first and then got worse intensely as the back pressure increased. A method was proposed to prevent reverse flow by estimating back pressure, which was an effective complementary approach for ejector systematic design. When designing a pneumatic ejector system, the back pressure range where the ejector worked normally should be derived both from theoretical calculation and experimental test. Reverse flow could be prevented if the back pressure was controlled within normal range, thus the optimum performance would be achieved.  

  Number of references:  18 

  Main heading:  Air ejectors 

  Controlled terms:  Ejectors (pumps)  -  Finite volume method  -  Flow rate  -  Flow velocity  -  Mass transfer  -  Pneumatic control  -  Pneumatic equipment  -  Pneumatics 

  Uncontrolled terms:  Back pressures  -  Experimental apparatus  -  Optimum performance  -  Pneumatic system  -  Structural parameter  -  Suction flow rate  -  Systematic designs  -  Theoretical calculations 

  Classification code:  618.2 Pumps  -  618.3 Blowers and Fans  -  631 Fluid Flow  -  631.1 Fluid Flow, General  -  632.3 Pneumatics  -  632.4 Pneumatic Equipment and Machinery  -  641.3 Mass Transfer 

  DOI:  10.6041/j.issn.1000-1298.2015.02.046 

  Database:  Compendex

 

38. Accession number:  20151300692615

  Title:  Effect of drying methods on quality and glass transition temperature of rice 

  Authors:  Xu, Fengying1 ; Chen, Zhen1 ; Li, Changyou1 ; Huang, Mushui1   

  Author affiliation:  1  Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou, China 

  Corresponding author:  Huang, Mushui 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  187-192 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The dynamic of rice moisture content during hot air and microwave drying was measured and analyzed. The dynamic property of protein, amylose content and germination ratio of rice were analyzed by near infrared detection and germination observation. Furthermore, the influence of drying method on rice quality was measured by glass transition temperature which was got from the analysis of TG/DSC. Results showed that the fitting accuracy of logarithmic model was higher than exponential model during the process of rice dehydration by both drying methods, and the difference in protein and starch content of dried rice was not significant. However, there were significant differences in protein content between fresh and dried rice by hot air drying. The germination ratio of rice dried by hot air and microwave was much higher than fresh ones, which was 0.93±0.03, 0.77±0.02 and 0.65±0.19, respectively. As the rice moisture content decreased, the mass loss and heat flux of dried rice showed different changing trend and the glass transition temperature decreased as well. All of them had effect on the quality of dried rice. The results could be a reference for improving efficiency and quality during the process of grain drying.  

  Number of references:  20 

  Main heading:  Glass transition 

  Controlled terms:  Cultivation  -  Drying  -  Glass  -  Heat flux  -  Infrared devices  -  Microwave heating  -  Moisture  -  Moisture determination  -  Proteins  -  Solar dryers   -  Temperature 

  Uncontrolled terms:  Drying quality  -  Exponential models  -  Hot air drying  -  Improving efficiency  -  Influence of drying method  -  Logarithmic models  -  Microwave drying  -  Rice 

  Classification code:  641.1 Thermodynamics  -  641.2 Heat Transfer  -  642.1 Process Heating  -  711.1 Electromagnetic Waves in Different Media  -  741.3 Optical Devices and Systems  -  801.4 Physical Chemistry  -  802.1 Chemical Plants and Equipment  -  804.1 Organic Compounds  -  812.3 Glass  -  815.1 Polymeric Materials  -  821.3 Agricultural Methods  -  944.2 Moisture Measurements 

  DOI:  10.6041/j.issn.1000-1298.2015.02.028 

  Database:  Compendex

 

39. Accession number:  20151300692603

  Title:  Comparative analysis of reference evapotranspiration estimation methods using temperature data 

  Authors:  Zhang, Qian1 ; Duan, Aiwang2 ; Gao, Yang2 ; Shen, Xiaojun2 ; Cai, Huanjie1, 3   

  Author affiliation:  1  Key Laboratory for Agricultural Soil and Water Engineering in Arid Area, Ministry of Education, Northwest A&F University, Yangling; Shaanxi, China

 2  Key Laboratory for Crop Water Requirement and Regulation, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, China

 3  Institute of Water Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi, China 

  Corresponding author:  Cai, Huanjie 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  104-109 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Accurate estimation of reference evapotranspiration (ETo) is the basis of irrigation water management. When weather data is lacking or only temperature data is available, ETohas to be estimated with limited weather data. An attempt was made to estimate daily EToby using temperature-based and radiation-based methods, i.e., Penman-Monteith temperature method (PMT), corrected PMT method (PMT-cor), HG equation, modified HG (HG-M1, HG-M2), Thornthwaite equation and Irmak equation, corrected Irmak equation (Irmak-cor), McGuinness Bordne equation (M-B). These equations were evaluated against the PM model in Xinxiang. When using the PMT method to estimate ETo, the adjustment of Tminfor estimating Tdewwas adopted, when using the Irmak equation, the multiple linear regression was adopted to modify this equation. Results showed that the performance of PMT, PMT-cor, HG, Irmak and Irmak-cor methods were similar, which got the best EToestimation with coefficient of regression (b) and determination (R2) around 1.0, relative error RE<20%, index of agreement d>0.95, five models fitted the standard of good model. Cross-comparison of the five good models showed that Irmak-cor equation was the best method which had the highest accuracy in all models with b=1.00, R2=0.98, RMSE=0.17 mm/d, RE=7%, d=1.00; secondly, the Irmak equation, with b=1.03, R2=0.95, RMSE=0.31 mm/d, RE=12%, d=0.99. The precision of five models was in turn as Irmak-cor, Irmak, PMT-cor, PMT and HG equation. When considering the precision of the formula, the Irmak-cor equation was the best-suited equation for estimating EToamong the methods, but it was likely more appropriate to use HG equation, due to it was easy to compute and no requirements of temperature adjustment.  

  Number of references:  28 

  Main heading:  Water supply 

  Controlled terms:  Estimation  -  Evapotranspiration  -  Irrigation  -  Linear regression  -  Meteorology  -  Water management 

  Uncontrolled terms:  Comparative analysis  -  Irrigation water management  -  Multiple linear regressions  -  Penman-Monteith equations  -  PMT equation  -  Reference evapotranspiration  -  Temperature adjustment  -  Temperature data 

  Classification code:  443 Meteorology  -  444 Water Resources  -  444.1 Surface Water  -  446 Waterworks  -  446.1 Water Supply Systems  -  821.3 Agricultural Methods  -  921 Mathematics  -  922.2 Mathematical Statistics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.016 

  Database:  Compendex

 

40.  Accession number:  20151300691899

  Title:  Design of LEMs based on pseudo-rigid factor 

  Authors:  Qiu, Lifang1 ; Hu, Feng1 ; Zou, Jing2  

  Author affiliation:  1  School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, China

 2  School of Advanced Engineer, University of Science and Technology Beijing, Beijing, China 

  Corresponding author:  Qiu, Lifang 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  365-371 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Pseudo-rigid-body model is an important way to analyze kinematic and dynamic performance of compliant mechanisms and synthesize. The beam-flexible hinge combined mechanism is essential flexible fragment. A compliant mechanism was designed by using flexible fragments to replace rigid members of pseudo-rigid model. Traditionally pseudo-rigid-body model did not consider the effect of geometrical nonlinearity and deformation of the beam, so there was error between pseudo-rigid-body model of LEMs and the actual. In order to reduce the error, the impact of geometric nonlinearity was considered and corrected pseudo-rigid-body model was proposed, and in order to determine the applicability of pseudo-rigid-body model, the concept of pseudo-rigid factor was put forward. Flexible fragment can directly replace the rigid member when pseudo-rigid factor was in a certain range, and then the compliant mechanism can be obtained. Finally, the LEMs were optimally designed based on pseudo-rigid factor for cell engineering by ant colony optimization algorithm for continuous space.  

  Number of references:  19 

  Main heading:  Compliant mechanisms 

  Controlled terms:  Algorithms  -  Ant colony optimization  -  Cell engineering  -  Geometry  -  Mechanisms  -  Optimization  -  Rigid structures 

  Uncontrolled terms:  Ant colony algorithms  -  Geometric non-linearity  -  LEMs  -  Pseudo-rigid body models  -  Pseudo-rigid factor 

  Classification code:  408 Structural Design  -  461.1 Biomedical Engineering  -  601.3 Mechanisms  -  921 Mathematics  -  921.5 Optimization Techniques  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.054 

  Database:  Compendex

 

41. Accession number:  20151300692619

  Title:  Extraction technology and dynamics of total polyphenols from Terminalia chebula Retz. based on ultrasound assisted extraction with constant temperature 

  Authors:  Jiang, Shenhua1, 2 ; Liu, Mengying1 ; Du, Yuhui1 ; Shen, Yonggen1, 2 ; Liao, Liang1 ; Ma, Haile3  

  Author affiliation:  1  School of Pharmacy and Life Science, Jiujiang University, Jiujiang, China

 2  Jiangxi Key Laboratory of Watural Products and Functional Foods, Nanchang, China

 3  School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China 

  Corresponding author:  Shen, Yonggen 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  213-221 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to optimize the extraction of total polyphenols from Terminalia chebula Retz. (TCR), the extraction technology of total polyphenols from TCR were optimized by using ultrasound assisted extraction with constant temperature and three-frequency (UAE-CT & TF). The reasons for high efficiency of this extraction technology were analyzed by comparative experiments and scanning electron microscope (SEM). The dynamic equation of diffusion for the total polyphenols was determined and verified based on the first Fick theory. Results showed that the optimal parameters of extracting technology were as follows, the concentration of ethanol was 60%, ultrasound frequency was 80 kHz, ultrasound power was 180 W and extracting temperature was 70. The extraction efficiency of UAE-CT & TF dramaticlly exceeded that of water bath oscillator extraction (WBE) (P<0.001). The microcosmic structures of powders of raw material after being extracted by UAE-CT & TF were seriously destroyed from the analysis of SEM. The dynamic equation of diffusion for the total polyphenols extraction of TCR was determined based on the first Fick theory and ultrasound extraction dynamics. The verification experiment showed the logarithms of extraction time and power were all positively proportional to the concentrations of TCR total polyphenols. The technology of UAE-CT & TF was proved as a technology with high efficiency for extracting TCR total polyphenols.  

  Number of references:  25 

  Main heading:  Extraction 

  Controlled terms:  Computerized tomography  -  Dynamics  -  Efficiency  -  Pyrene  -  Scanning electron microscopy  -  Ultrasonics 

  Uncontrolled terms:  Comparative experiments  -  Constant temperature  -  Extraction efficiencies  -  Extraction technology  -  Polyphenols  -  Terminalia chebula  -  Ultrasound extractions  -  Ultrasound-assisted extraction 

  Classification code:  531 Metallurgy and Metallography  -  753.1 Ultrasonic Waves  -  801 Chemistry  -  802.3 Chemical Operations  -  804.1 Organic Compounds  -  913.1 Production Engineering  -  931.1 Mechanics  -  931.2 Physical Properties of Gases, Liquids and Solids 

  DOI:  10.6041/j.issn.1000-1298.2015.02.032 

  Database:  Compendex

 

42. Accession number:  20151300692592

  Title:  Hydraulic performance of fixed spray plate sprinkler under dynamic water pressure 

  Authors:  Ge, Maosheng1 ; Wu, Pute1, 2 ; Zhu, Delan1, 2 ; Zhang, Lin2 ; Gong, Xinghui1  

  Author affiliation:  1  College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi, China

 2  Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling; Shaanxi, China 

  Corresponding author:  Wu, Pute 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  27-33 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to improve the sprinkler application rate and kinetic energy distribution of fixed spray plate sprinkler, a dynamic water pressure based sprinkler test platform was built. A Nelson D3000 nozzle was selected and then the water application rate and kinetic energy distribution in radial direction were tested under both dynamic water pressure in trigonometric type and constant pressure. The results showed that the test platform could well meet the demands of dynamic water pressure. The wetness area of Nelson D3000 nozzle in radial direction increased from 0.85~1.36 m to 2.55~4.42 m. The maximum value of sprinkler application rate was reduced by 67.6%~78.4%, and the maximum value of energy density flux was reduced by 52.9%~71.6%. Both the sprinkler application rate and kinetic energy distribution of Nelson D3000 nozzle were effectively improved.  

  Number of references:  16 

  Main heading:  Fixed platforms 

  Controlled terms:  Electric power distribution  -  Kinetic energy  -  Kinetics  -  Nozzles 

  Uncontrolled terms:  Application rates  -  Droplet diameters  -  Dynamic water pressures  -  Fixed spray plate sprinkler  -  Hydraulic performance  -  Kinetic energy distributions  -  Sprinkler application  -  Water application rate 

  Classification code:  511.2 Oil Field Equipment  -  631.1 Fluid Flow, General  -  706.1.2 Electric Power Distribution  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.005 

  Database:  Compendex

 

43. Accession number:  20151300692593

  Title:  Experiments on hydraulic performance of impact sprinkler with adjustable elevation angle 

  Authors:  Li, Xingshu1 ; Zhang, Jianbin1 ; Han, Wenting1, 2   

  Author affiliation:  1  College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi, China

 2  Institute of Water-saving Agriculture in Arid Regions of China, Northwest A&F University, Yangling; Shaanxi, China 

  Corresponding author:  Han, Wenting 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  34-39 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  To adjust the elevation angle of sprinkler and reduce the effect of wind on water distribution, a set of adjustment device which fixed on the original structure of the sprinkler was developed. The adjustment device consisted of support bar, limited rod, flexible metallic hose, internal thread hollow shaft sleeve, set screw and adjusting screw. Four elevation angles of sprinkler nozzle (13°, 18°, 23° and 30°) could be adjusted and fixed respectively. To evaluate the hydraulic performance of the sprinkler with adjustment device, a series of indoor experiments were conducted. The results showed that the characteristics of single sprinkler with adjustment device changed evidently at different elevation angles. When elevation angles of the sprinkler were 23° and 30°, the combinatorial uniformity coefficients were larger than that at 13° and 18°, so it was more practicable in combinatorial sprinkler irrigation. Under different working pressures of 0.20, 0.25 and 0.30 MPa, the average sprinkler irrigation intensity increased with decrease of sprinkler elevation angle. Distribution of sprinkler water in the spraying end was more uniform at elevation angle of 23° than that at other angles in which the distribution of sprinkler water changed greatly and average sprinkler irrigation intensity increased accordingly. So decrease of elevation angle could reduce the effect of wind on water distribution effectively. On the other hand, because of the drastic variation of distribution of sprinkler water, the elevation angle of the sprinkler could not be too small. The rotation deviation of the adjustment device of sprinkler was less than ±10%. The test results indicated that it reached the indexes of JB/T 7867-1997.  

  Number of references:  15 

  Main heading:  Sprinkler systems (irrigation) 

  Controlled terms:  Irrigation  -  Radio communication  -  Screws  -  Water supply systems 

  Uncontrolled terms:  Adjustment device  -  Combinatorial uniformity coefficient  -  Elevation  -  Hydraulic performance  -  Sprinkler 

  Classification code:  446.1 Water Supply Systems  -  605 Small Tools and Hardware  -  716.3 Radio Systems and Equipment  -  821.1 Agricultural Machinery and Equipment  -  821.3 Agricultural Methods 

  DOI:  10.6041/j.issn.1000-1298.2015.02.006 

  Database:  Compendex

 

44. Accession number:  20151300692588

  Title:  Self-tuning model control method for farm machine navigation 

  Authors:  Bai, Xiaoping1, 2 ; Hu, Jingtao1, 2 ; Gao, Lei1, 2 ; Li, Taochang1, 2 ; Liu, Xiaoguang1, 2  

  Author affiliation:  1  Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang, China

 2  Graduate University of Chinese Academy of Sciences, Beijing, China 

  Corresponding author:  Hu, Jingtao 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  1-7 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to improve the precision of path tracking, a self-tuning model control method for farm machine navigation was presented. The thought of the two-level control was induced to design the navigation controller. As the first level controller, the nonlinear kinematics model and feedback linearization theory were used to design the control law, and counting formula of the system controlling quantity was given. In order to solve the imprecision problem of the nonlinear kinematics and improve the stability of the navigation system, a second level controller was needed. As the second level controller, the fuzzy controller used the fuzzy control method to adjust system control quantity of model controller online and adaptively. The results of the path tracking experiment for the agricultural machine showed that the control method kept the advantages of model controller for tracking the straight and solved the problems of model controller in a curved path tracking. When it ran at the speed of 1.0 m/s, the maximum lateral deviation of straight path tracking was less than 0.0649 m, the maximum lateral deviation of curved path traced was less than 0.1857 m.  

  Number of references:  25 

  Main heading:  Controllers 

  Controlled terms:  Agricultural machinery  -  Control theory  -  Feedback linearization  -  Fuzzy control  -  Kinematics  -  Level control  -  Navigation systems  -  Nonlinear feedback 

  Uncontrolled terms:  Agricultural machine  -  Farm machines  -  Feedback linearization theory  -  Fuzzy control methods  -  Model control  -  Navigation controllers  -  Nonlinear kinematics  -  Two-level control 

  Classification code:  434.4 Waterway Navigation  -  731 Automatic Control Principles and Applications  -  732.1 Control Equipment  -  821.1 Agricultural Machinery and Equipment  -  921 Mathematics  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.001 

  Database:  Compendex

 

45. Accession number:  20151300692606

  Title:  Cokriging analysis on soil bulk density in Karst basin of Southwest China 

  Authors:  Yang, Qiyong1 ; Zhang, Fawang1   

  Author affiliation:  1  Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, China 

  Corresponding author:  Zhang, Fawang 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  126-131 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Heqing basin is a typical dam agriculture area in Yunnan province in Southwest China, which was selected as the study area. 114 soil samples (0~10 cm) were collected in metal cylinders (diameter 5 cm; length 5 cm), and soil bulk density (SBD) and soil water content (SWC) were measured gravimetrically. The classical statistical analysis methods of ordinary Kriging (OK) and ordinary Cokriging (OCK) were used to study the spatial variability of soil bulk density. Results showed that the values of soil bulk density ranged from 0.74 g/cm3to 1.60 g/cm3with an average of 1.25 g/cm3. The low value of soil bulk density distributed in north and south regions in the study area, while the high value distributed in mid-east region, which were influenced by soil type, texture and land use in the dam area. Soil bulk density was highly correlated with soil water content and the correlation coefficient between them was -0.686. The spatial variability of soil bulk density was studied using OCK method with soil water content as auxiliary variable, and the prediction accuracy was enhanced by 36.61%.  

  Number of references:  21 

  Main heading:  Soils 

  Controlled terms:  Land use  -  Soil moisture 

  Uncontrolled terms:  Co-Kriging  -  Semi-variances  -  Soil bulk density  -  Soil water content  -  Spatial variability 

  Classification code:  403 Urban and Regional Planning and Development  -  483.1 Soils and Soil Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.019 

  Database:  Compendex

 

46. Accession number:  20151300692636

  Title:  Design and experiment of 2D electrohydraulic high-speed on-off valve 

  Authors:  Jiang, Haibing1, 2 ; Ruan, Jian1 ; Li, Sheng1 ; Zuo, Xiqing1 ; Chen, Ying1  

  Author affiliation:  1  Key Laboratory of E&M, Ministry of Education, Zhejiang University of Technology, Hangzhou, China

 2  College of Mechanical Engineering, Quzhou University, Quzhou, China 

  Corresponding author:  Ruan, Jian 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  328-334 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  2D electrohydraulic high-speed on-off valve was a two-stage valve, which had a spool with two dimensional motions, a rotary electromagnet drove the spool to rotate by a set of lever-fork and achieve pilot function, and pressure difference pushed the spool to open or close quickly. The form of three circumferential uniformly distributed 52° blades was adopted by the rotor of rotary electromagnet. The output torque of rotary electromagnet was multiplied by five times, the rotor inertia was reduced by lever-fork and the dynamic characteristics of 2D high-speed on-off valve were improved. To test the dynamic characteristics of 2D high-speed on-off valve driven by double torsion pendulum wheel and rotary electromagnet, two experimental programs of the valve were designed. The digital simulation and experimental results were quite coincide, which showed that the dynamic characteristics of 2D high-speed on-off valve were very quick; when the system pressure was 28 MPa and the valve of 6 mm diameter with spool driven by rotary electromagnet, the dynamic response time was about 18 ms, spool displacement was 0.8 mm and the flow rate was 60 L/min.  

  Number of references:  16 

  Main heading:  Speed 

  Controlled terms:  Dynamic response  -  Electromagnets  -  Hydraulics  -  Reels  -  Rotors 

  Uncontrolled terms:  Digital simulation  -  Double torsion  -  Dynamic characteristics  -  Experimental program  -  High speed on-off valve  -  Lever-fork  -  Pressure differences  -  System pressure 

  Classification code:  408.1 Structural Design, General  -  601.2 Machine Components  -  632.1 Hydraulics  -  704.1 Electric Components  -  742.2 Photographic Equipment  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.049 

  Database:  Compendex 

 

47.  Accession number:  20151300692623

  Title:  Effect of W/O emulsion coagulants on rheological properties and microstructure of cold-set SPI gels 

  Authors:  Zhu, Qiaomei1 ; Li, Jinlong1 ; Fan, Xin1 ; Yin, Lijun1   

  Author affiliation:  1  College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China 

  Corresponding author:  Yin, Lijun 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  240-246 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Scanning electron microscopy (SEM), texture profile analysis (TPA) and dynamic rheology technique were applied to investigate the effect of traditional bittern and different water in oil (W/O) emulsion coagulants on the rheological properties and microstructure of cold-set SPI gels. Rheological tests suggested that the development of the mechanical moduli (G') of these SPI gels was highly dependent on the release rate of magnesium salts from W/O emulsions. The values of G' in all cold-set SPI gels gradually increased with the extension of time and W/O emulsion coagulants prolonged the solidification time of cold-set SPI gels in comparison with traditional bittern coagulant. This could be attributed to the controlled-release properties of W/O emulsion coagulants. In addition, cold-set SPI gel prepared with W/O emulsion coagulant containing WPI exhibited a longer solidification time and a lower value of G' than W/O emulsions without WPI. Cold-set SPI gels induced by W/O emulsion coagulants had better microstructure than that of traditional bittern coagulant as shown by SEM results, which elucidated that W/O emulsion coagulants could obviously decrease the strength of cold-set SPI gels and produce protein gels with smaller pores and more homogeneous network structure.  

  Number of references:  20 

  Main heading:  Emulsions 

  Controlled terms:  Coagulation  -  Emulsification  -  Gels  -  Microstructure  -  Rheology  -  Salts  -  Scanning electron microscopy  -  Solidification  -  Textures 

  Uncontrolled terms:  Coagulants  -  Controlled release properties  -  Rheological property  -  Solidification time  -  Texture analysis  -  Texture profile analysis  -  W/O emulsions  -  Water in oil emulsions 

  Classification code:  741.1 Light/Optics  -  802.3 Chemical Operations  -  804 Chemical Products Generally  -  931.1 Mechanics  -  933 Solid State Physics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.036 

  Database:  Compendex

 

48. Accession number:  20151300692607

  Title:  Temporal and spatial variation in stable carbon and nitrogen isotope in paddy field water 

  Authors:  Liu, Hui1 ; Wang, Weimu1, 2 ; Tan, Jiankang3 ; Wang, Qun2  

  Author affiliation:  1  Key Laboratory of High-Effective Irrigation and Drainage and Agricultural Water and Soil Environment in Southern China, Ministry of Education, Hohai University, Nanjing, China

 2  College of Water Conservancy and Hydropower, Hohai University, Nanjing, China

 3  Environmental Monitoring Station of Lishui District, Environmental Protection Bureau of Nanjing, Nanjing, China 

  Corresponding author:  Liu, Hui 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  132-136 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Since the stable isotope composition was widely used as tracers in the process of pollutant migration and transformation, stable isotope analyses of carbon and nitrogen in paddy field sampled from Nanjing irrigation area were studied. The results showed that delta C-13 values of particulate organic matter (POM) were between -31.5‰~-24.3‰, with an average value of -27.7‰. The stable carbon and nitrogen characters of particulate organic matter (POM) varied greatly in different sites. The isotopic signatures of both POM and zooplankton remained sufficiently distinct from each other throughout the period of study. Delta C-13 values of particulate organic matter and zooplankton showed some seasonal variation, reflecting higher values during spring and summer than autumn and winter. But delta N-15 values were more constant except the last sampling. The spatial and temporal variations of delta C-13 values were similar between zooplankton and POM, which meaned that POM may be the main resource of zooplankton. The minimum delta N-15 value of POM was 3.1‰ and nitrogen fixation could be ignored in the study area. This study was the first to quantify such a seasonal switch in zooplankton and particulate organic matter in paddy field.  

  Number of references:  16 

  Main heading:  Nitrogen fixation 

  Controlled terms:  Biogeochemistry  -  Biological materials  -  Carbon  -  Isotopes  -  Nitrogen  -  Organic compounds 

  Uncontrolled terms:  Delta C-13  -  Delta n-15  -  Paddy fields  -  Particulate organic matters  -  Spatial and temporal variation  -  Stable carbon and nitrogen isotopes  -  Stable isotopes  -  Temporal and spatial variation 

  Classification code:  461.2 Biological Materials and Tissue Engineering  -  481.2 Geochemistry  -  802.2 Chemical Reactions  -  804 Chemical Products Generally  -  804.1 Organic Compounds 

  DOI:  10.6041/j.issn.1000-1298.2015.02.020 

  Database:  Compendex

 

49. Accession number:  20151300692617

  Title:  Evaluation of kiwi-fruit juice contaminant capacity of indigenous alicyclobacillus and its biodiversity 

  Authors:  Zhang, Jiangbo1 ; Liu, Xinghua1 ; Yue, Tianli1 ; Yuan, Yahong1  

  Author affiliation:  1  College of Food Science and Engineering, Northwest A&F University, Yangling; Shaanxi, China 

  Corresponding author:  Liu, Xinghua 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  198-207 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to evaluate the potential risk of Alicyclobacillus contamination in Shaanxi kiwi fruit production line, six strains of Alicyclobacillus isolated from the production line were studied. The contaminant production capacity of six strains and four corresponding standard strains was evaluated, including detection of contaminant production using GC-MS and heat resistance through drawing thermal death curves, and its biodiversity was analyzed, including analysis of carbon source spectrum by API tests and detection of its DNA hybridizations from renaturation rates. The results showed that no 2, 6-dibromophenol and 2, 6-dichlorophenol were detected, and the guaiacol production of six isolated strains was between 10.56 μg/L and 34.74 μg/L which was significantly higher than the common sensory detection threshold values in juices, D90values of strains were 27.1~34.2 min and the z values were 12.14~13.66 in kiwi fruit juice, with the heat resistance of the three strains of A. acidoterrestris generally being higher than the data of former reports. There were 7~22 different results of API tests between the isolated strains and the data from published articles or their corresponding standard strains. The hybridizations between the isolated strains and their corresponding standard strains were between 74.75% and 104.79%. These results suggested that the isolated strains possessed potential contaminant production capacity and biodiversity to a certain extent which needed to be controlled.  

  Number of references:  26 

  Main heading:  Fruits 

  Controlled terms:  Bacilli  -  Biodiversity  -  Birds  -  Contamination  -  Fruit juices  -  Heat resistance  -  Specific heat 

  Uncontrolled terms:  Alicyclobacillus  -  Detection threshold  -  DNA hybridization  -  Isolated strains  -  Juice  -  Kiwifruits  -  Potential contaminants  -  Production capacity 

  Classification code:  454 Environmental Engineering  -  454.2 Environmental Impact and Protection  -  461 Bioengineering and Biology  -  641.1 Thermodynamics  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  821.4 Agricultural Products  -  822 Food Technology  -  822.3 Food Products  -  931.2 Physical Properties of Gases, Liquids and Solids 

  DOI:  10.6041/j.issn.1000-1298.2015.02.030 

  Database:  Compendex

 

50.  Accession number:  20151300692589

  Title:  Pear orchard scene segmentation based on conditional random fields 

  Authors:  Zhou, Jun1 ; Zhu, Jinrong1 ; Wang, Mingjun2  

  Author affiliation:  1  Key Laboratory of Intelligent Agricultural Equipment in Jiangsu Province, Nanjing Agricultural University, Nanjing, China

 2  School of Mechanical Engineering, Ningbo University of Technology, Ningbo, China 

  Corresponding author:  Zhou, Jun 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  8-13 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  A pear orchard scene segmentation based on conditional random fields (CRFs) was proposed. The CRFs modeled posterior probabilities directly, and had an ability to fuse context information of images. Therefore, it was a suitable method to solve images segmentation of the pear orchard scene whose structures are often very complicated. Firstly, labeled images of the pear orchard scene were segmented into superpixels, and feature vectors of the superpixels and their corresponding labels were integrated into a label database as training samples. Secondly, unlabeled images of the pear orchard scene were also segmented into the superpixels, and their features and spatial relationships between these unlabeled superpixels were modeled by using the CRFs. Moreover, parameters of the CRFs model were obtained by taking the label database as the training samples. Finally, labels of the unlabeled superpixels were inferred through the maximum posterior marginal (MPM) algorithm. The experimental results showed that the proposed algorithm could provide more accurate segmentation results of the pear orchard scene compared with the mutual K-nearest neighbor method (MKNN).  

  Number of references:  19 

  Main heading:  Image segmentation 

  Controlled terms:  Content based retrieval  -  Farms  -  Fruits  -  Nearest neighbor search  -  Orchards  -  Random processes  -  Sampling 

  Uncontrolled terms:  Conditional random field  -  Conditional Random Fields(CRFs)  -  Mutual k-nearest neighbors  -  Pear orchard scene  -  Posterior probability  -  Spatial context  -  Spatial relationships  -  Super pixels 

  Classification code:  741 Light, Optics and Optical Devices  -  741.1 Light/Optics  -  821 Agricultural Equipment and Methods; Vegetation and Pest Control  -  922.1 Probability Theory 

  DOI:  10.6041/j.issn.1000-1298.2015.02.002 

  Database:  Compendex

 

51.  Accession number:  20151300692637

  Title:  Performance study and test of hydraulic braking system based on remaining pressure control 

  Authors:  Zhang, Chunhui1, 2 ; Zhao, Jingyi1, 2 ; Qin, Jing1, 2 ; Guo, Rui1, 2  

  Author affiliation:  1  Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao, China

 2  Key Laboratory of Advanced Forging & Stamping Technology and Science, Ministry of Education, Yanshan University, Qinhuangdao, China 

  Corresponding author:  Zhao, Jingyi 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  335-342 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to improve the performance of hydraulic braking system, the influencing factors of vehicle braking performance and system principle of mine dump truck were analyzed. Results indicated that the shorter the action time, the smaller the braking distance under certain conditions of maximum braking deceleration and initial braking speed. The simplified model of hydraulic brake system was established, and characteristic analysis was made toward its key component brake pedal valve. The simulation model was built by AMESim to study the influence of brake performance with parameter variation. Conclusion showed that braking system response speed and pressure building time were impacted by several parameters such as accumulator volume, charging pressure and brake pipe length. The methods of decreasing brake action time by residual pressure control were proposed. Correctness of the simulation analysis was verified by experiment results which showed that the action time of brake was reduced and braking distance was shortened with this method. Braking performance was improved greatly, which provided theoretical basis for the design and optimization of similar products.  

  Number of references:  16 

  Main heading:  Braking performance 

  Controlled terms:  Braking  -  Hydraulic brakes  -  Pressure control  -  Product design  -  Trucks 

  Uncontrolled terms:  Braking distance  -  Characteristic analysis  -  Design and optimization  -  Hydraulic brake systems  -  Hydraulic braking  -  Initial braking speed  -  Residual pressures  -  Simulation analysis 

  Classification code:  602 Mechanical Drives and Transmissions  -  663.1 Heavy Duty Motor Vehicles  -  731.3 Specific Variables Control  -  913.1 Production Engineering 

  DOI:  10.6041/j.issn.1000-1298.2015.02.050 

  Database:  Compendex

 

52.   Accession number:  20151300691900

  Title:  Analytical model of transverse vibration of thin type circular saw in sawing hard and brittle stone 

  Authors:  Bai, Shuowei1 ; Zhang, Jinsheng1 ; Wang, Changhui2 ; Wang, Zhi1 ; Huang, Bo1 ; Cheng, Peng3  

  Author affiliation:  1  Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, Shandong University, Ji'nan, China

 2  Modern Agricultural Equipment Co., Ltd., Beijing, China

 3  China Academy of Machinery Science & Technology, Beijing, China 

  Corresponding author:  Zhang, Jinsheng 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  372-378 and 371 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Based on analysis of the reason of nodal diameter transverse vibration of thin type circular saw in sawing the stone, it was found out that the wave of the wavy deformation of traveling wave on the saw edge led to the additional axial force of sawing force. The mathematical model of axial additional force was deduced by traveling wave theory in a rotating coordinate system with the same rotational speed as the diamond circular saw, and then the transverse vibration model of diamond saw blade was built by using the thin plate theory of elastic mechanics. The model was pretreated by using complex analysis theory and some proper mathematical methods. The solving algorithm for transverse vibration model and the simulation program were designed based on the Newmark method. In order to verify the validity of the model, a transverse vibration monitoring experiment was completed in the stone producing spot. The transverse vibration of two positions of the diamond saw blade was measured under different process parameters. The error between simulation result and experimental result was less than 13%, therefore, the correctness of the model was verified. The established transverse vibration model could provide theoretical support for optimization of saw blade structure, design of sawing machine tool, noise reduction in sawing process and improvement of the machining surface quality.  

  Number of references:  19 

  Main heading:  Vibration analysis 

  Controlled terms:  Algorithms  -  Axial flow  -  Diamond cutting tools  -  Diamonds  -  Machine tools  -  Mathematical models  -  Metal working saws  -  Noise abatement  -  Sawing  -  Saws   -  Vibrations (mechanical) 

  Uncontrolled terms:  Axial forces  -  Diamond saw blade  -  Machining surfaces  -  Mathematical method  -  Newmark methods  -  Process parameters  -  Rotating coordinate system  -  Transverse vibrations 

  Classification code:  482.2.1 Gems  -  603.1 Machine Tools, General  -  604.1 Metal Cutting  -  605 Small Tools and Hardware  -  631.1 Fluid Flow, General  -  751.2 Acoustic Properties of Materials  -  751.4 Acoustic Noise  -  921 Mathematics  -  931.1 Mechanics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.055 

  Database:  Compendex

 

53.  Accession number:  20151300692599

  Title:  Carbon fluxes in cotton field with plastic mulched drip irrigation in Xinjiang oasis 

  Authors:  Wang, Jin1, 2 ; Bai, Jie3 ; Chen, Xi3 ; Luo, Geping3 ; Wang, Shaoming1  

  Author affiliation:  1  Key Laboratory of Oasis Ecology Agriculture, Xinjiang Production and Construction Groups, Shihezi University, Shihezi, China

 2  Wulanwusu Agrometeorological Experiment Station of Xinjiang, Shihezi, China

 3  State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China 

  Corresponding author:  Bai, Jie 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  70-78 and 136 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  Carbon and water fluxes of cotton field with plastic mulched drip irrigation were measured using an eddy covariance (EC) technique in 2009, 2010, 2012 and 2013 at Wulanwusu experimental station, which was a representatively agricultural oasis in northern Xinjiang. The diurnal pattern of mean monthly gross primary production (GPP) and net ecosystem exchange (NEE) showed an obviously sinusoidal dynamic from June to September, whilst that of ecosystem respiration (Res) stayed low and stable between daytime and nighttime. The response of daytime hourly GPP to net solar radiation (Rnet) could be expressed by a rectangular hyperbolic function. The variations of maximal assimilation rate (A) were followed changes in LAI, and the peak value occurred in July. The seasonal variations of GPP and NEE were close to the cotton phenology, and they almost reached the peak value in July. However, seasonal variations of Resdidn't follow that of LAI, and the maximum value occurred nearly one month earlier than that of LAI. Seasonal NEE showed a carbon sink from squaring to harvest period, whilst it indicated a carbon source before the squaring time as well as after the harvest time. The cumulative GPP averaged 816.2 gC/m2during the growing season (from April to October), and more than half of GPP was partitioned into NEE (meanly -478.6 gC/m2).  

  Number of references:  37 

  Main heading:  Irrigation 

  Controlled terms:  Carbon  -  Cotton  -  Ecology  -  Ecosystems  -  Environmental engineering  -  Hyperbolic functions  -  Sun 

  Uncontrolled terms:  Cotton fields  -  Drip irrigation  -  Eddy covariance  -  Gross primary production  -  Net ecosystem exchange 

  Classification code:  454 Environmental Engineering  -  454.3 Ecology and Ecosystems  -  657.2 Extraterrestrial Physics and Stellar Phenomena  -  804 Chemical Products Generally  -  821.3 Agricultural Methods  -  821.4 Agricultural Products  -  921 Mathematics 

  DOI:  10.6041/j.issn.1000-1298.2015.02.012 

  Database:  Compendex

 

54.  Accession number:  20151300692634

  Title:  Failure analysis of degradation induced by contaminant particles in gear pump 

  Authors:  Liu, Yong1, 2 ; Ma, Biao1 ; Zhang, Saifei3 ; Yan, Yu4  

  Author affiliation:  1  School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China

 2  School of Mechanical and Power Engineering, North University of China, Taiyuan, China

 3  Multiphase Flow Research Lab, University of Illinois at Urbana-Champaign, Urbana-Champaign, United States

 4  Military Deputy Office of PLA in Changsha, Changsha, China 

  Corresponding author:  Ma, Biao 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  316-321 and 327 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  The flow degradation of gear pump was induced by the contaminant particles entrained in the fluid within the power shift steering transmission (PSST). On the basis of the degradation mechanisms of gear pumps, the mathematic model for the broken process of contaminants was proposed through the investigation of contaminants entrained into the leakage path in the clearance between the gear ends and the end plates. Within the model, both the values for the particle broken constant and the leakage rate were determined. Thereafter, the degradation model for gear pump was derived for the inference on the relationship of the contaminant mass with wear parameter. In addition, the effects of the contaminant level and the construction parameters were also analyzed. Results showed that the contaminant wear, including the process of particle broken and wear debris generation, can be well interpreted by the degradation model. Meanwhile, the prediction method of contaminant sensitivity for gear pumps was provided by the model, which was valuable and practical for the improvement of hydraulic and lubricated system in PSST.  

  Number of references:  20 

  Main heading:  Impurities 

  Controlled terms:  Contamination  -  Degradation  -  Failure analysis  -  Gear pumps  -  Hydraulics  -  Pumps 

  Uncontrolled terms:  Construction parameter  -  Degradation mechanism  -  Degradation model  -  Leakage paths  -  Leakage rates  -  Mathematic model  -  Prediction methods  -  Wear parameters 

  Classification code:  421 Strength of Building Materials; Mechanical Properties  -  618.2 Pumps  -  632.1 Hydraulics  -  714.2 Semiconductor Devices and Integrated Circuits  -  802.2 Chemical Reactions  -  921 Mathematics  -  951 Materials Science 

  DOI:  10.6041/j.issn.1000-1298.2015.02.047 

  Database:  Compendex

 

55.  Accession number:  20151300692613

  Title:  Influence of ozone disinfection on nitrogen form transformation and content in anaerobic sludge 

  Authors:  Qiu, Ling1, 2 ; Zhang, Rongting1, 2  

  Author affiliation:  1  College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling; Shaanxi, China

 2  Rural Renewable Energy Development and Utilization of Western Experiment Station, Ministry of Agriculture, Yangling; Shaanxi, China 

  Corresponding author:  Qiu, Ling 

  Source title:  Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 

  Abbreviated source title:  Nongye Jixie Xuebao 

  Volume:  46 

  Issue:  2 

  Issue date:  February 25, 2015 

  Publication year:  2015 

  Pages:  176-180 

  Language:  Chinese 

  ISSN:  10001298 

  CODEN:  NUYCA3 

  Document type:  Journal article (JA) 

  Publisher:  Chinese Society of Agricultural Machinery 

  Abstract:  In order to study the influences of different durations of ozone aeration on the nitrogen content and form transformation in anaerobic sludge, the experiment was conducted with self-designed apparatus, with six different durations of ozone aeration, 0, 10, 20, 30, 40, 50 min, respectively, sampling and measuring content of nitrogen in different forms. The results showed that different durations of ozone aeration remarkably affected the nitrogen content in different forms in wastewater system. Specifically, the content of total nitrogen, Kjeldahl nitrogen, soluble Kjeldahl nitrogen, ammonium nitrogen, nitrite nitrogen, particulate organic nitrogen and particulate total nitrogen, showed significant decline trend with magnitudes of 124.76, 232.51, 11.45, 191.28, 4.35, 221.06 and 286.06 mg/L (P<0.05), respectively. By the contrary, the content of soluble total nitrogen, nitrate nitrogen and dissolved organic nitrogen showed upward trend, which were increased by 161.29, 29.42 and 179.83 mg/L at the end of 50 min (P<0.05), respectively.  

  Number of references:  15 

  Main heading:  Nitrogen 

  Controlled terms:  Ozone 

  Uncontrolled terms:  Ammonium nitrogen  -  Anaerobic sludge  -  Dissolved organic nitrogen  -  Nitrate nitrogen  -  Nitrogen content  -  Nitrogen form  -  Ozone disinfection  -  Waste water systems 

  Classification code:  804 Chemical Products Generally 

  DOI:  10.6041/j.issn.1000-1298.2015.02.026 

  Database:  Compendex