Abstract:The producing mechanism and developing law of the temperature restraint stresses on the layer-face of photoelastic model with variable elastic modulus are investigated with experimental studies and theoretical analysis, and the stability of the fringe figure of the restraint stresses or the fixedness of the restraint is verified repeatedly with the experiment. Thus the single model method of eliminating the influence is put forward, and the formula with superposing of fringe parameters of the method is given. The single model method is of great importance to eliminat the influence of the restraint stresses on photoelastic modelling with variable elastic modulus for soil and rock engineering and improving the experiment accurcy.

Abstract:It's recommended that the term coupled in temperature and strain is nonlinear and is significant in thermoelastic theory. Using the solution of linear coupled and uncoupled theory and selecting appropriate general coordinates, authers approach the nonlinear coupled problems with a variational method. A solution to the problem in half space, is given. It is shown that the difference between the nonlinear coupled theory and the linear coupled or uncoupled theory would be notable when the amplitute of temperature is much larger than that of the reference slate.

Abstract:This paper presents a robotic system for the rehabilitation of moving functions of the human body. It also shows that it is possible to apply the myoelectrical signal for correction of velocity of executive mechanisms movement. The myoelectrical signal contains information about muscle function and fatigue during the operation of the robotic system. The results of the simulation are described for. the robotic system which consists of two planar executive mechanisms. This robotic system is used for the training of the human hands.

Abstract:28 to 70 nonlinear equations are required to solve for the path synthesis of planar six-bar mechanism when using the method of displacement matrix, this brings on a great deal difficuties in solving the problem and heavily limits the applied scope of the method. In this paper an incomplete parameter synthesis is presented in which the synthesis of six-bar mechanism is sim-plified to those of bar-group or four-bar machanism so that the solution becomes much easier.

Abstract:超小型机局部网络与微机局部网络在物理性能和技术实现上存在着许多不同的特点。本文论述上述两种不同局部网络在互连中所涉及的互连协议,路由选择,信包拥挤和流量控制,点一点实时通信等一系列技术问题,并分别讨论了它们在实现以DG公司的ECLIPSE MV/8000Ⅱ超小型机为服务器的以太网与3COM公司的微机以太网的互连系统中的具体应用。

Abstract:An optimization approach for multi-relational joins based on the matching concept in graph theory is introduced. The basic idea lies in constructing a join graph from an expression of N-relation query, and seeking for a maximun matching with minimun total weight. The algorithm for bipartition(X, Y) is proposed in this paper.

Abstract:A new computer data acquisition and communication system is proposed in this paper. The system has the following charatcrjstics: the master station has the double functions of monitoring and controllng the slave stations. The system has low bit erro rrate of data communication, high catch rate of data acquisition and the strong operational reliability. The two years practical operation has proved that the system proposed is effective for the environment-protection field.

Abstract:本文首先从数学上证明了在有限塑性问题的虚功方程或变分原理中,Cauchy应力是与Euler应变,Kirchhoff应力是与Lagrange应变,名义应力是与位移梯度配对的。接着,在此基础上导出了率形式的,以Kirchhoff应力率表示的虚功方程。本文还以不同于Tvergaard的方法导出了他于1984年提出的自我校正方法,使方法中的Lagrange乘子显示出物理意义。最后作为方法的应用,本文根据所导出的率形式的虚功方程建立的有限元公式和自我校正方法对囿棒拉伸时缩颈过程和缩颈传播作了有限元分析。并比较了采用或不采用自我校正方法两种情况下的有限元计算精度。分析时考虑了材料的硬化。

Abstract:In this paper, the strain fatigue: crack propagation rates of vanadium bearing HSLA steel with different micro-structures are measured under constant load conditions, and the relationship between the crack propagation rate and the microstructures of steel is also studied.

Abstract:This paper analyzes and proves the seeking for projects of the test bed, the equivalent processing for the bi-electric machine set and the control and loading modts of the test bed. It also introduces briefly the features of the block diagram of the control system and gi.ves the test waveforms. Finely, it points out the problems to be further studied.

Abstract:Since D. Post promoted the holographic moire' interferometric techniques. It has been developed in all kinds of aspects. It is applied in measuring mechanical parameters in the fields of fracture mechanics, composite material mechanics, biomcchanics etc. Howerver, some problems in the development of the holographic grating and holographic moire' techniques theory are still existed. This paper deducted the frequency of holographic grating and the equation of moire/ method's displacement with Fourier opticsal, and improved the holographic moire' technologic theory. It provides a theoretic foundation for extensive applying of the holographic moire' techniques.

Abstract:In this paper, basic principles and methods about preparing ultrafine particles at home and abroad are systematically introduced, and the ma-in species of ultrafine particles and their future applications are briefly discus- sed.

Abstract:A sufficient condition of the recurrence and a sufficient and ne- cessary condition of the transience for an irreducible and aperiodic Markvo chain are given in this paper. The theorem 4 and- theorem 5 proved by F, G. Foster [1] are just the particular cases of them. Finally, these results are applied to the embedded Markov chain associated with queueing process so as to resolve the problem of the state classification for M/G/1 queueing process with bulk service studied by Bailey [2].