Abstract:To calculate the aerodynamic forces on the vehicle and grid-fins，we use time-dependent method to solve the Navier-Stokes equation of ideal gas，and flux conservational multizones method to divide the complex vehicle and grid-fins into eight computational zones which are relatively independent，and correlative with each other at once with satisfactory results.

Abstract:In this paper，a comprehensive numerical model is presented for simulating combustion process of gas hydrogen and oxygen jet flow in the liquid propellant rocket engine preburner，including the governing equations of combustion processes，k-εturbulece model，EBU turbulence combustion model and auxiliary formula of thermo-dynamic properties. With this model，numerical simulation of the effect of the injector configuration and the jet mode of gas oxygen on the flow，mixing and combustion processes was performed. The numerical results show that the injector configuration and the jet mode of gas oxygen have a significant effect on flow field and combustion performance.

Abstract:Numerical simulation of unsteady flow in liquid propellant rocket engine is performed with a new PISO algorithm in the present paper.The algorithm yields approximate solutions of the differential equation with one predictor step and two corrector steps at each time level instead of iteration calculation. Therefore，the CPU time cost in the calculation is reduced greatly which made numerical simulations of unsteady flow become practicable.

Abstract:The Recess ratio (RR) is an important design parameter of gas-liquid coaxial swirling injector in liquid rocket engine. In this paper，an experimental investigation of the influence of RR on atomization properties of injectors has been carried out. The results show that there are certain differences between atomization properties of different injectors of different recess ratios under various working conditions. On the whole，the recess ratio does not affect the atomization so obviously as it does on the flux and mixing ratio characteristics. At low gas injecting drop，neither large RR nor small RR is favorable to atomization，on the contrary，both large RR and small RR will meliorate the atomization at high gas injecting drop. However，with too large RR，the liquid injecting drop vibrates owing to the interaction of between and liquid phases.

Abstract:The paper investigated the quasi-rigid resolved motion control for free-floating space manipulators when the base is not fixed，especially the generalized Jacobin matrix applied, and one simulating example.

Abstract:A turbulent coal jet flame is employed to simulate the rapid devolatilization of pulverized coal in practical coal combustion. The variation of the size and internal structure of coal particle during devolatilization were investigated through a sampling analysis technique. It is found that the volume of coal particles obviously expands during the devolatilization and the extent of the expansion heavily depends on the particle size and heating rate. During the devolatilization，the hollow structure of coal particles is formed due to the rapid release of volatile，which can result in more rapid combustion of char particles.

Abstract:In this paper,an adaptive estimator of reentry trajectory parameters is proposed. The method can compensate for the unknown statistic characteristics of the dynamic noise. And it can give adaptive estimation of both state parameters of the trajectory and systematic errors of the measuring equipments in an interactive way. The simulation result indicates that the adaptive estimator has high precision.

Abstract:In this paper，an approach to depleted shutdown guidance for solid ballistic missile is described. The complex guidance mathematical model applying to solid ballistic missile without thrust ending system is given under the condition that the fuel is depleted randomly. And then，it's correctness is proved by simulation.

Abstract:This paper studies the guidance scheme of the interception missile to intercept the actual target which is an intermediate or short range ballistic missile. According to the interception missile's flight characteristics, the trajectory is divided into three phases: primary，middle and interception phase，With variant guidance schemes. The simulation has proved that the schemes are feasible and the result is satisfactory.

Abstract:In the study of the recipients of synthesis of ployester resin of powder coating, stress is laid on the effect of achohol and acid on glass transition temperature of polyester resin. The result shows that synthetic polyester has property specifications similar to the U. S. products.

Abstract:With tetrapyridine nickel dinitrile (TPNDN) as Catalyst，the poly-p-phenylene (ppph) is synthesized from bromobenzene. The derivatives of ppph，poly (2，5-dimethoxy)-p-phenylene，poly (2，5-diethoxy)-p-phenylene and poly (2，5-dibutoxy)-p-phenylene are synthesized from hydroquinone by using FeCl₃ as catalyst. IR spectra of these polymers are presented and conductivity and current versus voltage (I-V) characteristics are determined.

Abstract:This paper deals with the damping characterstics of short carbon fiber、SiC whisker and 2B₂0₃.Al₂O₃ whisker reinforced magnesiurm composites，analyses their mechanical properties and fracture surfaces. Damping behavior of magnesium composites vary as reinforcers. C(f)/Mg composites exhibit higher damping than whiskers rein-forced magnesium composites. Fiber/matrix interface plays an important role in damping.

Abstract:The paper analyses the relation of the heat field on the parts, surface processing parameter and allowance field, then constructs the mathematical model for parts complicated shape with digital scanning and filter. Based on this，the synthetical control of the geometric and the surface quality of parts is established in the processing course, This is the new effective method of improving the reliability and service life of the thin-wall parts of complicated shap under high-load in aircraft engine.

Abstract:In this paper，a design method for the 3-degree standard return trajectory of the manned spaceship is studied. The basic design concept is to first set up the motion equations of it's return trajectory in the return coordinate system，then to homogenize the reentry overload and diminish the flight range difference between the standard trajectory and the self-spin one when the lift is out of control by using non-constant bank angleγ_ν(t). The lateral guidance idea is introduced to determine the sign of γ_ν(t). Finally，the theoretical analysis and numerical results show that the design scheme proposed has good practical value.

Abstract:This paper caculates the scanning umbrella antenas with the method of PTD，and derives the relation between the electronic parameters and structural parameters of scanning umbrella antenas，which is very useful for design.

Abstract:Multi-feature fusion technique is used to recognize and classify the image target in this paper. We extract the fractal feature and gray entropy from the image，then use Dempster-Shafer's Evidential Reasoning to fuse the information at the report level. Some decision strategies are used to recognize and classify the image. In experiment，we compare the results obtained from Multi-feature fusion with those obtained from single feature. The final results indicate that the Multi-feature fusion method is stable，reliable，and can efficiently improve the accuracy and the ability of fault tolerance.

Abstract:In this paper，the theory and properties of wavelet transform are introduced. Vector quantization，which has been applied successfully in the image coding，is more efficient than scale quantization. We use this technique for image coding in the wavelet transform domain and get a satisfactory simulation result.

Abstract:In this paper，the resolution of the CRT Display is discussed. Then，the critical technologies of horizontal scanning circuit，dynamic focus，300MHZ video amplifier of 2048×2048，ultra-high resolution monochnome display are analyzed in detail. The special requirements of the colour display are described simply in the end.

Abstract:The optics wavefront processor system (OWPS) described in this paper is one of the key processors in 1.2m telescope adaptive optics system (AOS). It is a highperformace system with high throughput rate and short delay. In order to meet the high speed requirement，the demanded real-time and concurrency in the main computation is first analyzed，then a decorrelation procedure for wavefront processing is proposed. Based on the several subtasks in wavefront computation，data acquisition，slope computation and wavefront reconstruction are conducted in pipeline. The delay is reduced greatly by the utilization of image aquisition time and the foundation of pepeline.

Abstract:In this paper the important feature of artificial neural networks —— parallel distributed processing is discussed thoroughly，so the essential features of neural computing are revealed，and the important conception of timestep is introduced. At the same time，two critical concepts of mapping algorithm —— balancing the working load of PEs and the communicatin overhead among PEs are explained more thoroughly，and the main allocation criterions are presented. Adopting the ideas of graph theory，an optimal neural network mapping algorithm —— Absorb Algorithm is advanced. This mapping algorithm shows remarkable efficiency. Some interesting experimental results are presented.

Abstract:Communication overhead is an important factor which affects program performance in massively parallel processing systems. This paper introduces an optimizing technique for sequential loops in MPP Fortran programs. This technique，through application of synchronization control to sequential loops and changing sequential loops into shared ones，will reduce communication overhead and improve program performance.

Abstract:In this paper，the current state of researches on context is briefly introduced，a new Logic of Context，CL，is defined，some of its definitions and theorems are also provided.

Abstract:In this paper, the algorithms designs and error analysis on the y/x 、y/√ x、a^x log_a^x、x^y functions in supercomputer are discussed.

Abstract:This paper introduces the development and application of magnetic levitated control technology. On the basis of inferring the dynamic equations of the model，the characteristics of the magnetically levitated vibration isolation system are analyzed. A method for reducing the bandwidth of system by applying feedback of acceleration is introduced，and it is proved by the experiment that the theoretical analysis is effective.

Abstract:The speciality of the position sensor of the magnetic suspension and balance system is that it needs to acquire multi-freedom-degree position components. This paper deals with this problem carefully，and discusses its project solution.

Abstract:Multi-time-scale algorithm is used in two-dimensional electromagnetic relativistic particle simulation of plasma produced by laser beam. It described correctly the collective effects of plasmas and reduced much computational cost.

Abstract:The first published report of using Gd₂O₃ as a buffer layer to make integrated optical polarizers on Ti: LiNbO₃ is presented. The calculating and experimental results are given. The extinction ratio of polarizer>35dB.

Abstract:This paper presents a algorithm for distinguishing a real symmetric matrix into a positive definite, positive semidefinite, negative definite ,negative semidefinite or non-definite matrix. With the technique of selecting maximum diagonal element，the stability of numerical computation for the algorithm is good. The operation numbers of the algorithm is given and the total number of operations of multiplication or division and addition or subtraction of the algorithm are, respectively,at most 1/6 n (n-1)(n+4) and 1/6 n (n-1)(n+1). The numerical examples are given.

Abstract:We first present a vector of function basis BB(t)that satisfied BB(O)^T=(0.0,1.0,0.0,0.0),BB(1)^T=(0.0,0.0,1.0,0.0) BB′(O)^T=(-0.5,0.0,0.5,0.0)，BB′(1)^T=(0.0,-0.5,0.0,0.5)BB"(O)^T=(1.0,-2.0,1.0,0.0)，BB"(1)^T=(0.0,1.0,-2.0,1.0)Secondly we discuss the rational surface defined in tension-product form using above function vector BB (t). The interpolation surface implies the following results: (1)The surface interpolates control points; (2) It is second order parametrically continuous;(3) It is local and can be adjusted by weights. The effect of weights is also analysed and has similar result as bicubic rational B-spline surface.

Abstract:In this paper，we study several toplogies such as Q，^*τ，J_τ in ^*X and obtain some properties. Eospecially，we give another proof of the Stone-Cech theorem by studying quotient，topologies of ^*X.