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1997年 第18卷 第12期    刊出日期：1997-12-18

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论文

T-Y TUBE MODEL OF HUMAN ASCENDING AORTIC INPUT IMPEDANCE

吴望一;戴国豪

1997, 18(12):  1125-1135. 

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This paper proposed a T-Y tube model to simulate foe input impedance of arterial system. It improves and extends the asymmetric T-tube model which was firstproposed by O’Rourke[1] and developed laier by Liu et al.[2]. Based on foe asymmetricT-tube model. a T-Y tube model was proposed by adding branching tubes whichrepresem the iliac arteries.All the tubes are considered to be uniform,viscoelasticlongitudinally tethered cylindrical tubes.The upper tube terminates with a windkesselmodel, while the terminal arterioles of the lowr tube are expressed as a resistance.After proper eraluation of the parameters.the impedance of the arterial system iscalculated under normal physiological and hypertensive condition.The model canpredict impedance in good agreement with the experimentally obtained data no matterin normal physiological condition or in pathological condition In comparison with theasymmeric T-tube model,T-Y tube model is closer to anatomy structure of the human arlerial system and at the sametime much simpler than the extremely complex multiplebranching tube model Therefore it will be a valuable model in studying the influencesof various parameters on aorta impedance and ventricular-vascular coupling.

KÁRMÁN-TYPE EQUATIONS FOR A HIGHER-ORDER SHEAR DEFORMATION PLATE THEORY AND ITS USE IN THE THERMAL POSTBUCKLING ANALYSIS

沈惠申

1997, 18(12):  1137-1152. 

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Kármán-type nonlinear large deflection equations are derived occnrding to the Reddy’s higher-order shear deformation plate theory and used in the thermal postbuckling analysis The effects of initial geometric imperfections of the plate areincluded in the present study which also includes th thermal effects.Simply supported,symmetric cross-ply laminated plates subjected to uniform or nomuniform parabolictemperature distribution are considered. The analysis uses a mixed GalerkinGolerkinperlurbation technique to determine thermal buckling louds and postbucklingequilibrium paths.The effects played by transverse shear deformation plate aspeclraio, total number of plies thermal load ratio and initial geometric imperfections arealso studied.

CONVERGENCE OF ATTRACTORS

秦文新;刘曾荣

1997, 18(12):  1153-1158. 

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The system of coupled oscillators and its time-discretization (with constantstepsize h) are considered in this paper. Under some conditions, it is showed that thediscrete systems have one-dimensional global attroctors l_h converging to I which is theglobal attractor of continuous system.

SOME IDENTITY RELATIONS BETWEEN PLANE PROBLEMS FOR VISCO-AND ELASTICITY

杨骁;程昌钧

1997, 18(12):  1159-1167. 

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In this paper.the boundary value problems of plane problems with a simply-ormultiply-connected domain for isotropic linear visca-elosticity are first established byterms of Airy stress function F(X_u t). Secondly some identity relations betweendisplacements and stresses for plane problems of sisco-and elasticity are discussed indetait and some meaningful conclusions are obtained As an example the deformationresponse for viscoelastic plate with a small circular hote at the center is analyzed undera uniasial uniform extension.

THE STATIONARY VALUE PROPERTY OF HAMILTON’S PRINCIPLE IN NON-HOLONOMIC SYSTEMS

梁立孚;梁忠宏;石志飞

1997, 18(12):  1169-1176. 

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This paper proves that Hanlilton’s prmciple of both using the Appell-Chetaevcondition and not using the Appell-CHETAEV conditiion is the variational principle of stationary action.The relevant problems are discussed.

BIFURCATION PROBLEM OF CRITICAL POINTS FOR QUADRATIC DIFFERENTIAL SYSTEMS

张祥

1997, 18(12):  1177-1190. 

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In this paper foe bifurcation of critical points for the quadratic systems of type(II)and (Ⅲ) is investigated. and an answer to the problem given in[1] is given.

UNIQUENESS OF SOLUTIONS FOR A CLASS OF NON-LINEAR VOLTERRA INTEGRAL EQUATIONS WITHOUT CONTINUITY

董卫

1997, 18(12):  1191-1196. 

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In this paper. the fixed point theorem of increasing opera for with non-continuityis uilized to discuss foe exislence and uniqueness of positire solution for a class of nonlinear Volterra integral equations. An important condition of continuity can bereplaced by weak condition.

THE DISTRIBUTION OF ZEROES OF SOLUTIONS OF NEUTRAL EQUATIONS

周勇;王志成

1997, 18(12):  1197-1204. 

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The purpose of ibis paper is to study the distribution of zerocs of solutions of theneutral delay differential equations. An estimate is estublished for the distween betweenadjacenlt zeroes of the solutions of such equations under less restritive hypotheses on the variable coefficients.The results obtained improve and extend scme known resultsin the literature.

A NECESSARY AND SUFFICIENT CONDITION FOR THE OSCILLATION OF SOLUTIONS OF LIÉNARD TYPE SYSTEM WITH MULTIPLE SINGULAR POINTS

孙继涛;张银萍

1997, 18(12):  1205-1210. 

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In this paper, a necessary and sufficient condition for teh solution of Lienard typesystem with muliiple singular points to oscillation under the more general assumptionis given.Results of the papers [1-4] are also extended and improved in this paper.

AN ELASTIC OSCILLATION MODEL FOR GOODS IN A SHORTAGE MARKET

高隆昌

1997, 18(12):  1211-1218. 

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In this paper. an oscillated model.which results from the shortage action in market economy with elastic replacement of goods is obtained.And some naturalrelations between the model and a typically oscillatory model are established Theresults can interpret some market phenomena and provied the theoretical tools for theeconomic program.

AN INVESTIGATION ON METERIAL PROPERTIES OF NON-HOMOGENEOUS CYLINDRICALLY ORTHOTROPIC CIRCULAR PLATES

秦圣立;阎柯柱;胡象岭;黄家寅

1997, 18(12):  1219-1223. 

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It has been been reported that the reduced stiffness of non-homogeneous cylindricallyorthotrpic circular plate varing exponentially with radius r is obtained by using thebending theory of a simple beamThe aim of this paper is to verify the effect of radius on the materal properties According to the flat stress-strain relation the values of material properties E_r E_a and v_θr which are the functions of radius r are obtained.Compared with the experimentalvalues the analytical values of the material properties are in essential agreement withtem.