Abstract:The essay analyses first cause of formation of price big increasing of China in1994,and forecasts prics situation in 1995 according to the diversity and complexity of price in-creasing cause and Box-Jenkins model,via test the forecasting result is gualified and is quite a greedwith practice,Finally,we put forward several views of controling price increase in 1995.

Abstract:According to the security investment theory of Markowitz,this paper presents aCaculation method of portfolio investment under the risk minimization,and some mathematic expres-sions of the efficient frontier for portfolio investment are conducted.Based on these,the efficientfrontier is proved as a parabola,and a practical caculation process is given.

Abstract:在分析国家标准《公差与配合》各部分数据构成关系的基础上，对ＣＡＤ系统环境下公差与配合标准数据的建库、检索和调用方法等问题进行了探讨，提出了一种全面、准确、高效的公关与配合标准数据处理模式；并在此基础上，完成了ＴＩＤ软件模块的研制。

Abstract:对数控液压系统及数字阀作了理论上的探讨。并着重对作者近年来研制的一种新型高压大流量接式数字溢流阀，进行了理论分析、数字仿真以及试验研究。试验结果与理论分析高度吻合，最后得出了具有普遍意义的结论。

Abstract:This paper presents the time series model of gear drivetrain error and a compari-son amang several typical time series spectrum estimations.and suggests a time series model suitablefor discribing transmission error.

Abstract:This paper proposes a new idea that Self-scanned Photodiode Array(SSPA)withthe common PN structure is replaced by the PIN structure.Theoretically,the general formulae of theproperties of recharged sampled mode SSPA are analysed in detail and a con clusion is drawn thatSSPA with PIN structure has the properties of higher responsibility and higher resolution,We com-pare its properties with those of SSPA with PN structure of equal area photosensitive cell.The resultshows that the former one has higher resposibility and the other parameter features are superior tothe latter.The experimental results are consistent with the theory.The new type of imaging sensorwith PIN structure can be widely used in the field of high speed data record,high resolving and dimlight detection ect.

Abstract:系统介绍了针对两种加工对象－空间曲面和任意平面的激光切割程序的示教生成方法；讨论了基于映射法的空间圆弧插补算法和对旋转影响的补偿控制算法相结合而得出的五轴联动插补算法。实于这些算法的新型五联动激光切割加工控制系统可以保证空间激光切割加工有效进行。

Abstract:The heat transfer perfomance in horizontal heating section of separate type heatpipe is experimentally studied.The effect of fluid-loaded rate and slope angle on heat transfer perfo-mance in horizontal heating section is reseached.A nondimension heat transfer criterion relation isobtained by regression of experimental data.

Abstract:The edge-edge connectivity of a graph is defined,and a class of quasi-regulargraphs is proposed with a maximum edge-edge connectivity.

Abstract:This.paper derives the basic solution of elastic half-space foundation plate byHankel transform,Then its boundary integral equation of distortion is estabished,The paper discuss-es bou ndary integral equation on plate of fixxing and/or simple support boundary.Then a systemof algebraic equations for the boundary values are established.A numerical example is given , its re-sult shows that this Method is correct.

Abstract:提出了一类基于三种控制策略的多模态自适应控制方法，通过在线获取对象的有关信息对各控制策略中的相应参数和规则进行修正，以期在复杂工况下提高被控系统的性能－鲁棒性。仿真试验研究证实了方法的有效性。

Abstract:In this paper,a method of constructing the wavelet neural networks for nonlin-ear fun ctional approximation is discussed.The expon ential convergence of the training process andits robust stability to the noise perturbances and the network design errors are also proved.

Abstract:n this paper,the principle structure and basic model of dual-passage excitationcontroller of asynchronized turbogenerator are presented.The control effect of each feedback termare analyzed.Two improved control schemes are proposed and testified by simulation in vestigation.

Abstract:This paper analyses the cause of very slow learning rate during the time of ap-proaching the minim um poi nt in con vertional BP algorithm, by introducing weight factor into themodification of the connection weight,an improved leavning algorithm for BP model is presented,itcan sign ificantly in crease the learning rate and improve con vergent behaviour.As an illustrative ap-plication example,the n umeriCal resu It of the medium-term load forecasting is given.

Abstract:在微机上采用刚－粘塑性有限元分析法对高速钢锻造过程进行了模拟研究，发现纵向裂纹主要是由于锻造过程中双鼓形的存在，使锻平时横截面内出现较大横向拉应力，其数值超过坯料强度而形成的。据此提了合理工艺参数和改进锻造工艺的措施，有限元分析结果与实际相符。

Abstract:The study on automatic balance of the rotor was made both from theory and ap-plication.In the light of the feature of automatic balancing,new analysis about the mechanical modelof vibratory system was done,and the result is that the accurate model of system can be gained bycompensation method and the traditional principle errors of balance machine both for soft and hardbearing can be overcome.The autornatic balance testing theory was proposed.The automatic balancesystem has been developed a nd the fu n ction a nd techn ical key are also discussed in detail.

Abstract:According to the characteristics of dynamic phenomenon of stope and drift facesin Yan Shi Tai Coal mine,the prediction system is set up on the basis of fuzzy method.With thismethod ,the forecasts of dynamic phenomen on are carried out.The preliminary application showsthat it is feasible to predict the dynamic phenomenon of stope and drift faces using this method.