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Volume，Issue6，2002

  • Hermite-type Interpolation Formula for Rational Function Interpolation Problem With Prescribed Poles

    Issue 6, (2002)
    Abstract：In the case of simple nodes, a Lagrange type interpolation formula for rational function interpolation problem with prescribed poles was developed. The present paper generalizes this formula to the case of multiple nodes. The connection between the above interpolation problem and confluent Cauchy matrix is also pointed out.  
    Keywords：Cauchy matrix,rational interpolation,Hermite type interpolation formula  
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    Updated：2024-02-27

  • The Method for Improving Precision of Estimating Modal Parameter

    Issue 6, (2002)
    Abstract：For sparse modal structure, a method of estimating natural frequency and damping ratio was developed. In this method, FRF's three spectrum Lines in the neighbour of resonance peaks are used. Estimating formula is deduced out. Taking a simple beam as an example, this method is tested. In wide band excitation, the estimating result is compared with Zoom FFT's result. It is demonstrated that this method is convenient and accurate in estimating vibration modal parameter.  
    Keywords：frequency response function,modal parameter,Zoom FFT  
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    Updated：2024-02-27

  • Visualized Programming for Discrete Element Simulation With PC Computers

    Issue 6, (2002)
    Abstract：The code of Discrete Element Method used for simulation of particulate materials with a UNIX platform was recoded and transplanted to PC computers with WINDOWS platform. During programming, several advanced techniques, such as mixed language programming, multithreading, dynamical link libraries and database were utilized. OpenGL graphics library was introduced to draw graphics, which can be saved or printed out conveniently. Test was done for the response of granular materials filled within a truck containner during a sudden breaking. The result showed that the new program has a friendly control interface and a high graphing performance with high computational efficiency.  
    Keywords：Discrete Element Method,simulation,visualization,graphics  
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    Updated：2024-02-27

  • Extraction and Immunosuppressive of Tannins From Herba Geranium

    Issue 6, (2002)
    Abstract：To determine a reasonalbe extraction technology and provide a reliable pharm acologic base for the complex ratio of the traditional Chinese medicine, extraction of Tannins from Herba Geranium by water reflux, warm water immersion, acetone solution reflux, cold water immersion with stir and alcohol solution reflux were carried out. The effects of Herba Geranium Tannins produced by different extraction technology were investigated on chicken lymphocyte proliferation in vitro with MTT method. The results showed that the extraction yield and content of tannins extracted by warm water immersion, acetone solution reflux and alcohol solution reflux were all higher, the method of warm water immersion was better on the basis of cost. Except the method of alcohol solution reflux, the tannins extracted by the other 4 methods increased markedly the ConA and LPS induced prolixferation of T and B lymphocytes respectively under low concentration.  
    Keywords：Herba Geranium,tannins,extraction,immunosuppressive effect  
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    Updated：2024-02-27

  • Off-Engine Control Technologies for Exhausting Particle From Vehicle Diesel Engines

    Issue 6, (2002)
    Abstract：The developing background of the off engine control technologies was described briefly. The common measures to control particle emission such as, diesel engine exhaust particle filter, the technique of engine emission control with plasma, the cyclone filtration technology for reducing engine particulate emissions, the oxy catalyst and the combined technology used to control vehicle engne emission were introduced emphatically. The problems lying in each measure were analyzed in accordance with Chinese specific conditions. The analysis showed that diesel engine exhaust particle filter and the combined technology are the better ways to control exhaust particle from vehicle diesel engine.  
    Keywords：vehicle diesel engine,exhaust emission,particle,off engine control technology  
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    Updated：2024-02-27

  • Development of Used Plastic Film Collector Machine in Idler Wheel Enwind

    Issue 6, (2002)
    Abstract：A used plastic film collector machine in the form of idler wheel enwind was developed. Using the tooth distributed on the idler wheel to pickup the used plastic film. It is useful to pickup the used plastic film with big root. This machine collect the pickup and collection, and omit transporting the film. If collocat knife and plough, the collector can cut off the root and plough soil. It have characteristics of structure simpleness and operation and maintenance convenience. 85 %-90% of used plastic film can be cleaned by this machine.  
    Keywords：pickup used plastic film,idler wheel,tooth of enwind used plastic film  
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    Updated：2024-02-27

  • Influence of the Shape and Size of the Nutritious Plate Plug on the Effect of Corn Seedling Growing

    Issue 6, (2002)
    Abstract：The size of nutrimental plate plug is determined by experiments, which may suit the condition of growing corn seedlings, and then the shape of corn tray coniform tray is also set. This shape may be propitious to corn seedling grow. In order to make it popularized, a kind of pasteboard seedling plate is designed according to the situation of our country. The new design is low price, wide applicable, disassembly in natural condition and can be used to solve the problems of roots interlacing and tray distortion during breeding seedlings.  
    Keywords：corn,nutritious plate plug,breeding seedling,transplanting  
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    Updated：2024-02-27

  • Experimental Study on the Glass Transition of Rough Rice in Drying

    Issue 6, (2002)
    Abstract：The glass transition theory was applied on the drying of rough rice kernel. A glass transition will occur in the temperature range typically encountered during rough rice drying. The mathematical equation was developed on the glass transition temperature and the moisture content of rough rice kernel. The glass transition theory was used to explain the mechanism of crack formation  
    Keywords：Drying,Rough Rice,Glass Transition,Stress Cracks  
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    Updated：2024-02-27

  • Experimental Study on Influencing Factors of Vacuum Freeze Drying of Gingers

    Issue 6, (2002)
    Abstract：A set of experiments designed by the orthogonal method was carried out on a lab scale vacuum freeze dryer and the freeze drying characteristics of gingers, such as the temperatures of eutectic and co melting points, were measured during the experiments. The analysis of the experimental results showed that the main influencing factors of freeze drying were heating temperature, material thickness and pressure of drying chamber. The sequence of importance were material thickness, heating temperature and pressure of chamber respectively  
    Keywords：vacuum freeze drying,Eutectic point,melting point  
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    Updated：2024-02-27

  • Experimental Research on Cooling Effect of Natural Ventilation in a Venlo-type Multi-span Greenhouse

    Issue 6, (2002)
    Abstract：Cooling effect of natural ventilation together with shading, roof sprinkling in a Venlo type multi span greenhouse was studied. The experiments were conducted in Venlo type glasshouse in Puyang city, Henan province, in July, 2001. The experimental data showed that the air temperature inside greenhouse was lower than outside when applied the natural ventilation cooling system, and the distributions of air temperature and relative humidity in the greenhouse were uniform. The roof sprinkling played an important role in the cooling system, and did not enhance the humidity of the greenhouse very much. The energy consumption in the greenhouse was reduced greatly in summer. This kind of natural ventilation cooling system could effectively reduce the air temperature and the energy consumption in multi span greenhouse in China.  
    Keywords：natural ventilation,cooling,shading,roof sprinkling,greenhouse  
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    Updated：2024-02-27

  • Methods for Evaluating the Quality of Ammoniated Feed of Crop Straw and Maize Stover

    Issue 6, (2002)
    Abstract：Wheat and rice straw, and maize stovers are the main by product of rural region. Nowadays more and more straw are used as the feed of ruminant after ammonization. But there is not a standard to evaluate quality of ammoniated straw feed. According to the research and the references from all over the world there are three methods to evaluate ammoniated straw quality can be used in work site or in laboratory including sensitive means, chemical and biological analysis. The chemical analysis method will be a comprehensive method, its index is 48 h rumen degradation rate of dry matter, according to the increased percentage points after ammonistion, it can be divided to: excellent(10 15), good(8 9), and pass(5 6).  
    Keywords：straw,maize stover,ammoniated feed,quality evaluation  
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    Updated：2024-02-27

  • Effects of Hydrochloric Acid and Caproic Acid on Quality of Corn Stover Silage

    Issue 6, (2002)
    Abstract：Effects of hydrochloric acid and caproic acid on quality of corn stover silage were studied by analyzing for pH, DM, organic acid composition and content, DM digestibility, NDF digestibility, DM Recovery, silage chemical composition of silage. Results showed that the addition of hydrochloric acid was decreased obviously, the lactic to total acid ratios, DM Recovery were also reduced, and concentrations of organic cell wall(OCW) ( P <0 05) were improved. It means that this treatment had debated the silage quality of corn stover silage. Caproic acid treatment had little effects on quality of corn stover silage. Treatment of corn stover with caproic acid and hydrochloric acid could obviously decrease concentrations of OB,ADF,ADL. Meanwhile, it could improve greatly the odor, color, texture of silage. It means that the addition of caproic acid and hydrochloric acid can improve the nutrient quality of silage.  
    Keywords：silage,hydrochloric acid additives,caproic acid additives,corn stover  
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    Updated：2024-02-27

  • Building and Study on Planet-cycloid Gearing Virtual Prototype

    Issue 6, (2002)
    Abstract：The virtual prototype of planet cycloid gearing was built by using mechanical system simulation software ADAMS. The key technology about the virtual prototype was studied. The validation test of the transmission radio of XW817511 planet cycloid gearing made in Tianjin Reducer Factory was carried out and the forces between the pin and cycloidal gear were analysed. The consistence of virtual prototype and theoretical calculation was confirmed.  
    Keywords：mechanical system simulation,planet cycloid gearing,virtual prototype  
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    Updated：2024-02-27

  • Study of Hydraulic Hitch System Controlling Technology for Tractor Working Units

    Issue 6, (2002)
    Abstract：A controlling scheme of the hydraulic system was developed. This new system can be used to replace the traditional system. The new electrohydraulic system includes an proportion valve as the main control value. The mathematic model of the new electrohydraulic system was developed. The stability and the dynamic performance of the system were analyzed through MATLAB software. The digial control of the system was realized by a 16 bit single chip processor system of MCS96. The characteristics of this control system have been verified by tests conducted on the FIAT 780 tractor test bed.  
    Keywords：tractor,electrohydraulic hitch system,electrohydraulic proportional direction valve  
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    Updated：2024-02-27

  • Application of an the Hydraulic Hitch System Based on 16-bit Microcomputer

    Issue 6, (2002)
    Abstract：As a essential part of intelligentized tractor implement combination, a new electronic hydraulic system was used to replace the old mechanical hydraulic system. A real time controller based on MCS 96 series 16 bits microcomputer was developed, which include the hardware and software design for 4 control modes of tractor plowing. The characteristics of this control system were verified by tests conducted on the laboratory simulation system, and the better performance was obtained.  
    Keywords：tractor,hydraulic hitch,single chip processor  
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    Updated：2024-02-27

  • The Application of MO(MapObjects) in the Development of Field Information System

    Issue 6, (2002)
    Abstract：The method of MO(MapObjects) application in the field information system was proposed. The map layer displaying, attribute querying, auto roam and map output of the field information system functions by using VC++ platform were described. The communication of AgGPS132 and PC was also implemented.  
    Keywords：GIS,VC++,MapObjects,GPS,field information system  
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    Updated：2024-02-27

  • Research on PPPoE Protocol Implementation on Windows Platforms

    Issue 6, (2002)
    Keywords：ADSL,PPPoE protocol,Windows system  
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    Updated：2024-02-27

  • Technology of Stable, High Speed and Low Temperature Electroless Plating Ni-W-P Alloy

    Issue 6, (2002)
    Keywords：dispersion design, index synthesize, craft optimum, property test  
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    Updated：2024-02-27

  • Screening the Freeze-tolerant Yeast Strains

    Issue 6, (2002)
    Keywords：freeze tolerant yeast,screening,frozen dough,pre fermentation,fermentative ability  
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    Updated：2024-02-27

  • Environmental Contamination From Animal Faeces in China and Control Countermeasures

    Issue 6, (2002)
    Abstract：Large amount of faeces from intensive stock raising in rapid development of China has caused serious environmental contamination. Status quo of the pollution and harm of the main contaminants in faeces such as N,P, mineral elements, odour materials, bio pathogeny and drug additives were summarized. It is pointed out that unreasonable prescripts of feed are the main reason of high concentration contaminants in faeces. Countermeasures of pollution control were discussed and it is concluded that to improve feed material quality and feed prescript, to use green additives, improve feed machining techniques can increase utility of feed nutrients and decrease amount of faeces and harmful contents. It is also concluded that faeces should be disposed with new techniques and should be multi utilized as manure, fuel, feed etc. It will decrease pollution, decrease resource waste and improve entiroment.  
    Keywords：animal faeces wastes,contamination,countermeasure  
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    Updated：2024-02-27

  • An Early Warning System Based on SVM Classification

    Issue 6, (2002)
    Abstract：An early warning system based on Support Vector Machine classification (SVM) was designed with SVM and early warning theory. It has been shown that this early warning system has an obvious advantage of generalization by testing China cotton production.  
    Keywords：early warning system,support vector machines,generalization,  
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    Updated：2024-02-27

  • Graphical Analysis of the Customs Duty Income Effect and Customs Rate

    Issue 6, (2002)
    Abstract：For developing country, the problems of customs duty should be studied qualitatively and quantitatively in two aspects: financial income and control of inport export. Based on the equilibrium model, the income effect of the customs duty was analysed. The Meade skill by which the customs is being analysed, was impoved. Thus, by using the impoved meade skill the analysis of customs effect and the customs rate in the equlibrium analysis is become more clear. The optimal customs and the maximum income customsduty were analysed by using HRC. The intersection point of the HRC curve and the foreign providing curve was correctly explained.  
    Keywords：customs duty income,optimal customs,maximum income customs,provding curve  
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    Updated：2024-02-27
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