Abstract:The iteration synthesis of substructures of the structural system in subspace is described and the iteration of the characteristic equation of the system in the subspace is derived. Therefore，a number of the low-order modes of the large structure can be found. According to this method only the mass matrix and stiffness matrix of every substructure of the structure must be stored in the computer. According to the preselective accuracy it is possible to solve the problem of the eigenvalue of the large structure simply and effectively.

Abstract:The physical models of the small thrust test stand of the engine have been constructed by means of the test and analysis calculation. Using analog computer technique are realized simulation and preliminary network compensation for the above-metioned two-degree of freedom systems.

Abstract:In this paper，the fundamental principles of the oblique-mode explosive-electric transducers are described. The equations to be solved are derived and some problems are discussed.

Abstract:This paper mainly describes the operating principles and parameter analysis of the reluctance brushless d c motor. The magnetic suspension technique is used to support the rotor shaft in order to increase the lifetime of the brushless d c motor. The rotor of our magnetic suspension momentum wheel is made of silicon steel pieces，so that the brushless d c motor chooses the reluctance-motor form. As the logistic circuit and the driving one are successfully developed by us，the motor of the magnetic suspension momentum wheel selects the three-phase stator of two pairs pole and the step spinning magnetic field at an electric angle of 60 degrees.

Abstract:This paper describes the scheme of automatic antenna impedance matching system for reentry vehicle. The structure selection and design of a key component-reflectometer have been accomplished. Al1 design drawings of C band reflectometer are provided and simulated experimental data of system operation are presented. The experiments indicate that automatic impedance matching scheme of C band can be realized. An important factor which effects whole system matching performance is the loss of phase shifter.

Abstract:The present paper has explained the designing of the extrusion rheometer，and the measuring of the flow characteristics of HTPB propellant by the extrusion rheometer.

Abstract:The present paper investigated the effect of some compounds on burning rate pressure exponent of HTPB composite solid propellant. The experimental results proved that CdS is a better additive for lowering HTPB composite solid propellant burning rate pressure exponent. When CdS Was used with other burning rate catalyst as a mixture additive，it may obviously lower propellant burning rate pressure exponent and enhance propellant burning rate. Final1y，we have used DTA technique to approach the action mechanism of CdS preliminarily.

Abstract:The war in Marwienas-islands provides abundant information for study on modern war. This paper discusses some important enlightenment from this war in view of military techniques systems engineering. The discussion concentrates on two subjects. First，in evaluating and developing various weapon systems，the right idea can only come from the study in the sense of military techniques systems engineering，second，there are some important problems arisen in this war in the field of military techniques systems engineering. The latter is the major part in this paper.

Abstract:In this paper several theorems of Walsh transformation for binary time-shift functions and non-binary time-shift functions are showed，The relation between two functions is established. The solution of linear differential equations with constant coefficient on the field of sequency is discussed and the general representation of this solution is given.

Abstract:In this paper，first we study the different shapes of the histograms of a certain graph when this graph is transtated on the given mesh. By means of this result，the bottom surface shapes of known workpieces can be distinguished by the touch sensor system of the robot. Then，we obtain a method of judge of a unknown shape by the touch sensor system.

Abstract:A miniature relational database management system TDMS (Table-Data Management System) implemented on microcomputer ALPHA is described. Now the system has been applied to the management of students' archives and statuses in our university.

Abstract:The paper made artific viscosity correction through truncation error analysis of Brailovskaya scheme. The numerical test was produced，and its results were compared with the results of other several schemes in 1iterature [2]. The comparison showed that it is better in respects of the calculating precision and velocity. By means of numerical test，present paper researched further implicit splitting scheme. The better calculating parameter was found.

Abstract:By using the technique of Racah algebra and antisymmetrizer，the atomic electrostatic energy matrix elements for electronic configuration l₁ⁿ¹ l₂ⁿ²…l_f^nf in the LS coupling scheme are obtained. There are only 6-j， 9-j symbols and one-partical substantive coefficients of fractional parentage in the expressions of these elements. Therefore，the atomic electrostatic energy can be evaluated more easily. This method can be used to calculate the energy levels of atoms and ions with higher atomic number，which are compositions of ablation vapor sometimes.