Abstract:The paper analysed the influence of x gear on the movement law of each engaging point and the flow characteristic of the second kind of compound gear pump with x gear.The formula of flowrate and flow pulse are given with the best type of instruction.

Abstract:Using the equivariant Ljusternik-Schnirelmann theory and the best estimates of the upper bound and lower bound of the critical values and the

Abstract:The combined deformation and mechanical properties of filament wound cylinder of filament reinforced composite materials were investigated in this paper. A method of using filament winding composites was established to reduce the amplitude of torsional vibration in the case of special stimulating vibration. A design formula of anisotropic filament wound cylinder to reduce the torsional vibration of axle components was obtained. The results indicated that by putting the filament wound cylinder on an axis, the torsional vibration of the axis can be reduced effectively.

Abstract:In this paper,the method of establishing the torsional vibration model of drilling string and rock bit and the process of simulation analysis are introduced.The interaction between bit and rock and elastic deformation of drilling string in the process of petroleum drilling which caused the torsional vibration of the drilling string and rock bit is main considered in establishing the model.The torsional model is solved by difference method.Based on the models,the simulation analysis software of drilling string and rock bit is designed,and simulation calculation and analysis of the tortional vibration of drilling string and rock bit under different conditions are computed,and the dynamic behavior and kinetics regularity of drilling string and rock bit in drilling are obtained.

Abstract:针对煤的钻屑温度和煤体温度对煤和瓦斯突出危险区域的敏感性，定义了预测掘进工作面突出危险性两个温度敏感指标，论述了两个温度指标作为预测突出危险性指标的依据和确定两个温度指标的方法。

Abstract:应用表观粘度和复粘度之间的关系及前人的实验数据，验证了经典的体液粘弹性四元模型，在此基础上引入了能与实验数据吻合得更好的血清粘弹性五元模型，并对模型中各元件的作用和生理意义进行了讨论。

Abstract:In this paper,a numerical model of a three dimensional human torso has been presented.In this model,the torso part including anisotropic muscle layers has been discretized by means of the finite element method(FEM).The rest of torso have been divided into the surface elements by the boundary element method(BEM).This discretized model can be used in the field such as the forward problem and the inverse problem of the electrocardiogram(ECG).

Abstract:A kind of ultrasonic atomizer equipments to produce tiny ceramic powders are developed and the optimal technical parameters of the equipment are cetermined,and the characteristics of tiny ceramic powders are also evaluated.

Abstract:The successive approaching and rapid cooling method is applied to determine the terminal point of melting,the melting rate of pre reducted pellet is carefully measured.Various factors influencing melting rate are studied via orthogonal experiment,and the influences of main factors are carefully studied via the single factor experiment.The apparent activation energy is expounded and calculated.

Abstract:A new automatic revised method of wafer profile error which uses CCD measuring error,sets up machining data base and carries out a wedge structure for stepless compensating error in honing process is described.Using this technology,a high precision LSI wafers can be obtained.

Abstract:Based on the exergy analysis method,the thermodynamic performance of high and low temperature heat exchangers is analysed and the calculating expressions of exergy efficiency are given,which can be used to study systematically the effect of cold and heat fluid inlet temperatures on the exergy efficiency of the high and low temperature heat exchangers on the condition of considering pressure exergy loss and not.

Abstract:The paper analyzed the force on the filler sealing in the centrifugal pumps.Through the experiments,the factors affecting the leakage rate were found such as the pressing force,the firction coefficient filler,the oviginal gap,the length of the sealing ring and so on.In the experiments,when the PTFE Ekonol Graphite,self lubricating composite materials were used as the sealing filler of the centrifugal pumps and the dynamic design was made,it showed that the performance of the pumps was obviously better than where the asbestos was.As a result,it may solve the leakage of the pumps and decrease the power loss because of friction.

Abstract:In order to decrease the current ripple and improve the operating performances of the rare earth permanent magnetic brushless DC motor system,a two quadrant current chopper is used in the system and its operating principles are analyzed in this paper.The results of digital simulation and system experiment are presented and confirm that the system based on the two quadrant current chopper has attractive performances.

Abstract:A new robust identification algorithm which is based on the estimation of parameter model,i.e.,Optimal Volume Ellipsoid parameter set identification algorithm is presented in this paper.It identifies not only a parameter point(the center of the ellipsoid) but also the error bounds of each parameter.It employs noise bounds in identification algorithm and dynamically modifies coefficients of identification convergent speed and direction in order to attain satisfactory perfomance.Digital simulation results show that is possesses high accuracy,dramatic convergent speed,excellent performance against noise and strong robustness as well as uniform convergent,which is obviously superior to traditional identification schemes.

Abstract:A CAI environment based on WWW is described and its advantages and feasibility are discussed. Also a set of functions of this CAI system and a set of tools of courseware authoring and system supervising are designed.

Abstract:用差分格式对灰色预测模ＧＭ（１，１）进行改进，建立了ＧＭ（１，１，λ）模型，拓展了ＧＭ（１，１）模型的应用范围。通过求解λ的值，便可求出预测值。

Abstract:The default of conventional schedule is expounded, which only emphasizes on system's overall object but overlooks sub system's local object. A mathematical model of two level multi object is put forward. The concept of relatively prior weight is defined, and a heuristic algorithm is given out. The results of computer simulation show that the algorithm is effective.

Abstract:It analyzes the operating state of enterprise in exessive indebtedness by the methods of statistical and break even analysis; and it analyzes the boundary of pressed for funds by the methods of assets structure and business effective analysis.Submit the train of thought for scientific research in enterprise operating with debts.

Abstract:According to physical and chemical properties of the liquid iron containing vanadium and titanium with injectanting method in laboratory,desiliconisation,titanium removal and desulfurization of the liquid iron containing vanadium and titanium have been tested and studied.

Abstract:On the application of F D(Floyd Dijkstra) algorithm to the design of cable laying,we provide a method to achieve optimal design of cable laying in this paper,and it is verified by practical examples.

Abstract:采用电导法研究了水溶液中液中盐的浓度与其电导率的关系。结果表明，在低浓度范围内电导率与浓度的平方根成线性关系，在较高的浓度范围内，首次发现浓度ρ与电导率ｋ间的定量关系为ｋ＝ａｂρ（１＋ｂρ）＾－１或ｋ＝ａｂρ＾４（１＋ｂρ＾４）＾－１。

Abstract:通过对精制萝卜红色素液态产品性能的测试和研究，表明精制萝卜红是一种优势的天然色素。生产精制天然色素是改善天然色素性能，拓宽应用的方向。