Abstract:Based on the speciality of coal breakage when it was cut by picks, the mechanical models were built according to coal tension strength. The mathematical equations of length of carbide-tipped cutter bit that is essential for picks and merit of cutting distance were derived. It was found that these equations are applicable for production.

Abstract:An approach for the control of a small sag cable is presented.The approach is based on a nonlinear predictive control scheme that determines the required axial displacement input so that the predicted response match the desired Results.It is accomplished by minimizing the norm squared local errors between the predicted and desired values.Finally simulation results that use the new control strategy to demonstrate the effective are show.

Abstract:The paper describes the design of high efficiency soft throw away wheel whose tension of abrasive belt is adjustable.With the airbag internal capsule and continuous spring ring structure,grinding vibration is decreased and machining accuracy is improved.

Abstract:研究以金属为造形材料的复杂形面最终用途零件的分层实体快速制造，着重分析复杂形面零件现有分层实体制造的原理加工误差与残留加工量，并与三坐标数控加工进行比较，提出一种新的分层板切割加工工艺来降低分层实体制造的原理加工误差和残留加工量。以圆球曲面为对象的分析计算证明新的分层制造方法的效果─在相近或更佳精度与残留加工量的条件下可以将现有分层实体制造的分层厚度从０ ．０５～０ ．１０ ｍｍ 提高到１ ｍｍ 数量级，使最终用途金属零件分层实体快速制造成为可能。

Abstract:The temperature field of sodium silicate bonded sand heating by microwave energy is measured and analyzed by the related characteristic quentities. The result shows that sodium silicate bonded sand heating by microwave energy has characters such as temperature rising speedy and heating occurring from inside to outside at the same time. The reasons of those characters are discussed by testing and analyzing. The viewpoint that the temperature rising of sodium silicate bonded sand heating by microwave energy is revocable by sodium silicate absorbing microwave energy is proposed. The results of this study are useful on rightly understanding the essentials of the heating by microwave energy for sodium silicate sand and rightly constituting heating technology.

Abstract:Research for applying the technique of dynamic condensation on the mechanical structure dynamic analysis.The tolerance of the mechanical structure dynamic characteristics has been investigated when it is solved with the useful method of mode condensation.The practice shows that computational result of the dynamic characteristics relating to reserved number of mode and the magnitude of the damping,when the freedom of the complicated mechanical structure finite element model be reduced in big amplitude with the mode condensation technique.

Abstract:采用虚拟仪器的方式，在速度较低的采集卡上快速、简便而准确地实现了自扫描光电二极管信号峰值的采集，提出了两种实现方法。并通过实验证实了其中用ＳＳＰＤ延时后的φ时钟代替数据采集卡内部时钟，完成ＳＳＰＤ信号峰值采集的方法是可行的。

Abstract:A auto mesh algorithm of the finite cover system is presented by abstracting the finite cover system of numerical manifold method as independent data classes.The programs are made by Object Oriented Programming(OOP).The accuracy manifold element can be generated automatically when the continuous material is cut by crack.The calculation result shows that the algorithm is reliable and effective.

Abstract:Thin laminar pearlitic colony is the element of a kind of two phase materials,which is composed of the thin lamellas of ferrite and cementite one over the other. With the assumption of small thickness of lamella and small deformation as well as that both phases are elastoplastic, an elastoplastic constitutive description for the pearlitic colony is obtained based on non classical theory of plasticity. The constitutive behavior in different direction and along non proportional path is analyzed. The finite element approach is also used to analyze the influences of the thickness of lamella on the material response. Satisfactory agreement is found between the results obtained by the two methods, which demonstrates the validity of the proposed model.

Abstract:Based on the concept of unification between strength theory and elastoplastic fracture criterion,and using the approximate solution for elastic-plastic plane stress-strain field in the vicinity of a blunt crack tip of power-law hardening materials,which was established by Chen Chi,a correction is made for both decohesion theory and hydrogen-facilitated local plastic deformation theory.The results from the two theories are found substancially identical.

Abstract:For the quasi static problems of two phase porous media,the velocity variable of fluid phase can be eliminated as the viscosity of fluid is neglected.The corresponding governing equations,with displacement of solid phase and pore pressure as basic variables,as well as the boundary and initial conditions are given out.Finally a mixed finite element formula with u S-p variables is obtained with weighted residual method.This method has lesser nodal variables and higher accuracy of pressure distribution.

Abstract:In order to reflect the stochastic characteristic of a structure more completely and accurately,this paper presents a theory and method of modeling with structural stochastic parameters using probabilistic finite element method and perturbant finite element method,on the basis of modeling with deterministic parameters.It is applied to double decker space frame,good results are gained.

Abstract:研制空气静压轴承主轴回转精度检测系统，提出正弦回归法分离测量球的安装偏心，采用“反向法”剔除测量球的形状误差，并引用实验予以验证。

Abstract:提出一种基于畸变电流有效值最小原理的谐波和无功电流检测新方法，并利用负反馈原理实现了基于该方法的检测电路。该方法不仅适用于单相，也适用于三相电路。

Abstract:Methods for satisfying the power balance requirement and the voltage magnitude costraint are developed and incorporated into the genetic algorithm method to form a constrained genetic algorithm for solving the load flow problem.The robustness of the load flow algorithm is enhanced by the dynamic population.the technique for accelerating the convergence of the optimisation process and the network node sequencing procedure described in the paper.The efficiency and feasibility of the developed CGALF algorithm have been tested using KK 11 node system under light load and heavy load conditions.

Abstract:Based on the research of a practical project for high hrequency high voltage switching power supplies,the state space average model as well as the transfer function of single end flyback converters,which can be used to analyze the stability of single end flyback switching power supplies,are established.

Abstract:A strategy for finding smallest reduction of information system is studied by using concept of core in rough set theory. A method of discovering classification rule in databases is proposed.

Abstract:This thesis analyzes the theory of image processing and feature extraction, character feature is investigated in this thesis, including width, intersection, chain-code, the way of structure of character is used, a hand-written character recognition and entry system is developed. It is proved feature is simple and definite.

Abstract:提出一种新的基于小波和低复杂度矢量量化的视频编码算法。利用子带间的相关性，通过同方向跨带矢量中部分低频系统分量间失真的计算代替整个失真的计算，将矢量量化器的计算复杂度降低了７６‰；通过最低频子图像的运动矢量去预测蓁子图像的位移矢量，极大地降低了运动补偿的复杂度。

Abstract:实验研究了Ｒ１３４ａ在水平三维微肋管内的沸腾换热。实验段有效长度３．０ｍ，内径１２ｍｍ，工质量量流率１００－２７７ｋｇ／（ｍ＾２．ｓ），热负荷１０－２０ｋＷ／ｍ＾２，饱和压力０．５４－０．６５ＭＰａ，实验考察了质量流率，质量干度和饱和压力对换热系数的影响。

Abstract:The piezoresisitive effect of p type diamond films is analyzed by deformation potential theory and valence bands split off model.It is found that the great difference of the efficient mass between the heavy and light hole of diamond is one of the main factors which are responsible for the piezoresistive effect in the p type diamond films.The gauge factor calculation formula is obtained according to the strain induced heavy and light hole band splitting off model,and the calculation results are in accordance with the experimental results.

Abstract:在实验室对烧结矿的ＦｅＯ、ＭｇＯ、Ａｌ２Ｏ３ 含量和碱度Ｂ（ＣａＯ／ＳｉＯ２）４ 个因素对烧结矿治金性能的影响进行了系统的试验研究。提出了重钢烧结矿最佳成分的方

Abstract:Whether or not success of a R&D project depends upon to a large extent of executing process after project selection. This study, bused on Data Envelopment Analysis theory and method, evaluates dynamic executing process of R&D projects in the light of the practice of our country, and also analyses managerial barriers that yield the innovation projects become relative inefficient and proposes appropriate policy countermeasures that could be taken.

Abstract:The paper applies the concept and philosophy of CIMS to the post field. The architecture of the integrated system about scheduling and dispatching optimization and quality monitoring of postal transportation networks in CIMS is presented.The characters and key technologies are also analysed.

Abstract:Mannich reactions of aromatic aldehydes with aromatic amines amines and aromatic ketones are performed at room temperature or slightly below in the presence of concetrated hydrochloric acid as the catalyst.Forty one new compounds are synthesized with yields of 18.9% to 92%.The effect of substituent in the ring.the amount of hydrochloric acid,reaction temperature and reaction time are systematically examined as well.

Abstract:在烷烃分子距离边救矢量基础上对分子中的用染色因子进行标识，提 种适用于描述 肪醇结构的距离－边数矢量μ，据此以１２４种脂肪醇分子的沸点为例，借助多元线性回归技术建立脂肪醇ＭＤＥ矢量与其沸点的定量结构－性质相关关系模型，模型复相关系数达Ｒ＝０．９９４６，均方根误差为ξＲＭＳ＝３．２６Ｋ。

Abstract:用３ 种检测粒子法（Ｗｉｄｏｍ ，Ｋｕｍａｒ，ｆｇ ｓａｍｐｌｉｎｇ） 对Ｌ－Ｊ流体临界温度以上的数十个状态点的化学势进行了模拟计算。结果表明，这几种方法与由Ｌ－ Ｊ流体状态方程得出的值吻合很好，但其中Ｋｕｍａｒ 法的结果在有些状态点与其它方法相差较大。另外，即使在ρ＊ ≥１．０ 这样高的密度下，采用适当的技术处理后这几种方法都是可行的。

Abstract:The problems of similar dual of subuormal operators are discussed.The symmetry of similar dual of the pure subnormal operator are proved and necessary and sufficient conditions that the similar pure subnonmal operatorha similar minimal normal extention are given and meanwhile the subnormal weighted shift of operators also discussed.