Abstract:In this paper，we successful1y took the soft x-ray radiographs that distinctly. showed the internal damage such as microcracks in glass/epoxy composites The failure mechanisms and damage evolution law could be effectively obtained from these radiographs co-operating with AE results. Based upon the fact that the orientation of microcracks in fiber composites under loading is invariably in parallell with fiber，we define the damage variables correspond to mode Ⅰ and Ⅱ in macroscopic fracture mechanics，and obtain the constitutive equations for the damaged lamina and laminate. The calculated results coincide closely with the experimental results.

Abstract:A general solution of differential equation for lateral displacement function in free vibration of rectangular thin plates is established in this paper. It can be used to solve vibration problem of rectangular plate with arbitrary boundaries. For example，the fundamental frequency of a plate with two opposite edges fixed and the other two edges free is solved.

Abstract:An important theoretical problem of the robot is how to gain necessary movement by controling mechanical hand. This paper describes the basic movement of the manual operation as the system of a rigid body which is made up of seven parts withe nive degrees of freedom. This movements are anlysed strictly and exactly with the gravity，control and friction of the seven parts into consideration. Various functions can be cleverly performed by the robot. In order to facilitate calculation on the computer，movement differential equations are created in terms of kane equation. These differantial equations are expressed by generaliced coordinates，which can be regarded as theoretical proof of analysing the movement mechenical hand.

Abstract:The general expression for the flexural vibration frequency lquations of beams is derived in this paper，Seventeen lateral frequency vibration equations under various supporting conditions are all its special cases.

Abstract:The microstructure and the properties of S147 aluminum alloy plate at each stage of deformation aging have been studied. The fracture aspects of the material have been analyzed and examined with a SEM. The microstructures and features of transition phase precipitates of S147 aluminum alloy after deformation aging have been analyzed and investigated with thin foil Specimens by TEM. The results show that the optimun deformation aging Can greatly increase the strength，plasticity and toughness of S147 aluminum alloy，and improve the feature and process of trousition phase precipitates.

Abstract:A physiochemical model of the self-deflagration of pure single crystal of ammonium perchlorate (AP) has been developed in this paper. The values of the self-deflagrating rate. pressure exponent and burning surface temperature at the pressures between 10 and 800 atm are calculated. The resucts are in good agreement with the experimental data made by Boggs.^[2] The calculations are based apon the assumptions that the decomposition of crgstal AP follows two competitive process. At low pressures，AP melts at first，decomposes and then the products react each other in the condensed phase accompanying with the generation of heat. The exothermic reaction in the condensed phase is the main heat source of Ap def1agration at low pressuress. And at the high pressares，the beat transferred from the gas phase to the burning surface increases rapidly，forming the direct decomposition and vaporization of crystal Ap. The regularity of burning rate changing with the pressure obtaind by Boggs' experiments can be clearly illustrated from these assumptions and calculations. This paper also uses a kind of new chemical reaction rate expression dT/dt (T is "temperature") to describe the Ap deflagration and presents the calculation method. This new expression facilitates the calculation of gas phase temperature gradient and makes the theoretical modeling succeed.

Abstract:In this paper，the effects of the oxidizer particle size on the aging behaviour of HTPB propellants have been studied. The experiments are done in air at 90℃. The aging behaviour is estimated by means of the changes in mechanical properties，hardness，weight loss and changes in burning rate of HTPB propellants. Also，the DSC is relerred to. The results of these experiments show that，in HTPB propellants，the reduction of the oxidizer particle size facilitates the increase of the aging behaviour of HTPB propellants. The DSC of the oxidizer particle size has further comfirmed the conclusion.

Abstract:The elastic cross sections of e^--He and e^--Ar col1isions are calculated using Roothaan-Hartree-Fock wavefunctions in a model potential scheme，including static，stater's type exchange and polarization potentials. The calculations agree with the experimental data. By comparing our calculations and the emperical exchange parameter used in the calculations with those of other authors' by using different atomic wavefunctions，the effect of the difference of different approximate atomic wavefunctions on the calculations is investigated.

Abstract:In this paper，using ?-Y transformation，we obtained an expression of the critical line for the model with n dimensional classical spin vector s and Ising spin σ arrayed alternately on the honeycomb lattice.

Abstract:The paper discusses mainly how to define a rational original construction of an optical system，and illustrates simply how to use the variables of the structure data and how to determine their increments.

Abstract:The surface-action is Considered here and the transfer characteristic of Faraday cup is derived theoretically. The analysis shows that there is an eigen frequency ω_c，which is related to the structure of the cup. When ω(measured signal's frequency) 《ω_c，the transfer characteristic function is a constant; but when ω≥ω_c，the function is the sum of a constant and a decreasing oscillation term. On the latter condition，the cup would cause the distortion of the measured signal.

Abstract:In this paper we present some numerical analysis for wave-head of pulse voltage on a water switch which is used in the High Power Pulse Water Dielectric Switch Research Device，i.e. No. 2 device in Lab. 206. We have theoretically discussed a variety of parameters which can affect characteristics of the water switch. We have drawn an important conclusion that C_M/C can evidently affect some characteristics of the Water switch. Thereby，a theoretic evidence is suggested for the design of a high power submicrosecond water switch. A lot of experiments' data in our device have confirmed our numerical analysis.

Abstract:In this paper we discuss a c1ass of partial differential equations with singular coefficients，the initial problem for which can be solved uniquely. We have proved the fo11owing theorem: The problem: Lu≡[(t^a/2?_t-λ₁(x,t)?_x)(t^a/2?_t-λ₂(x,t)?_x)+a(x,t)?_t+b(x,t)?_x+c(x,t)]u(x,t)=f(x,t) (x,t)∈R×(0,T] u∣_t=0=φ(x),limt^a/2u_t=ψ(x) can be solved uniquely by u∈C([0,T],H₁(R))∩C¹((0,T],L₂(R)) if the following conditions are satisfied. （A） a is a constant and 0j(x,t)(j=1,2)∈C’([0,T], C²(R)) and all the derivatives of the above functions are bounded by the constant; （C） φ(x),ψ(x)∈C₀⁴(R) （D） f(x,t)∈C((0,T],C₀²(R)),and sup{t^a/2(∣f∣+∣f_x∣+∣f_xx∣}＜+∞ (E) There exists a constantδ＞0,such that ∣λ₁(x,t)-λ₂(x,t)∣≥δwhere (x,t)?R×[0,T]. In the proof,we use the particular sets of energy inequalities.A generalizatitn of the theorem is obtained.

Abstract:In this paper，by uiewpoints of system engineering we study the solutions of n-person noncooperative games，give two new refinement types of Nash equilibrium point: 1st Nash eqai1ibrium point (1st Nash e.p.)and 2nd Nash equilibrium point (2nd Nash e.p.)，and prove its existence. There is risk in the 1st Nash e.p，conservation in the 2nd Nash e.p，both e.p. satisfying the global optimization.

Abstract:This paper given discribes a convex persevering fitting method. Given a sequence of points {p_i}_iⁿ=0 on a plane，a c'-quadratic (C² -cubic) convex persevering parametric spline interpolation curve with Bezier curve seqment is constructed Also is discussed its applications on CAD/CAM，for example，figure fitting of convex wheel.

Abstract:Some problems of structural dynamic stability are briefly introduced in this paper，such as category of structural dynamic stability，dynamic stability criterion，dynamic stability mode and solving methods of dynamic stability.