客户／服务器环境下的OS／22·1操作系统

ＯＳ／２２·１是当今客户／服务器计算模式的首选操作系统之一。本文对ＩＢＭＯＳ／２２·１操作系统所具备的，对客户／服务器计算模式的各种支持功能作了详细的介绍。

Study Of The Damage-Induced Anisotropy Of Quasi-Brittle Materials Using The Component Assembling Model

Damage-induced anisotropy of quasi-brittle materials is investigated using component assembling model in this study. Damage-induced anisotropy is one significant character of quasi-brittle materials coupled with nonlinearity and strain softening. Formulation of such complicated phenomena is a difficult problem till now. The present model is based on the component assembling concept, where constitutive equations of materials are formed by means of assembling two kinds of components' response functions. These two kinds of components, orientational and volumetric ones, are abstracted based on pair-functional potentials and the Cauchy - Born rule. Moreover, macroscopic damage of quasi-brittle materials can be reflected by stiffness changing of orientational components, which represent grouped atomic bonds along discrete directions. Simultaneously, anisotropic characters are captured by the naturally directional property of the orientational component. Initial damage surface in the axial-shear stress space is calculated and analyzed. Furthermore, the anisotropic quasi-brittle damage behaviors of concrete under uniaxial, proportional, and nonproportional combined loading are analyzed to elucidate the utility and limitations of the present damage model. The numerical results show good agreement with the experimental data and predicted results of the classical anisotropic damage models.

Dynamic mode I perturbation solution for a moving crack unsteadily

Rice et al. (Jounal of Mechanics and Physics of Solids 42, 813-843) analyze the propagation of a planar crack with a nominally straight front in a model elastic solid with a single displacement component. Using the form of Willis er al. (Journal of the Mechanics and Physics of Solids 43, 319-341), of dynamic mode I weight functions for a moving crack, we address that problem solved by Rice ei al. in the 3D context of elastodynamic theory. Oscillatory crack tip motion results from constructive-destructive interference of stress intensity waves. Those waves, including system of the dilatational, shear and Rayleigh waves, interact on each other and with moving edge of crack, can lead to continuing fluctuations of the crack front and propagation velocity. (C) 1997 Elsevier Science Ltd.

壁面非平衡复相催化反应及其对传热的影响

在理想吸附层假定下对两种常见的复相崔化反应模型导出了反应速率表达式,分析了反应级数的变化规律和范围。采用新定义的“壁面催化非平衡系数”作为表征壁面非平衡催化工况的准则参数,用粘性激波层法计算分析了壁面非平衡催化效应对驻点区壁面热流的影响规律。

电子束对LY12硬铝的损伤效应

对LY12硬铝受到电子束辐照时产生的热激波及材料的损伤破坏效应进行了理论计算,将计算值同实验结果进行比较,二者基本上是一致的。在研究中等能量沉积产生材料的破坏效应时,应适当考虑材料的熔化过程,所用的状态方程是GRAY三相状态方程,而在研究材料的损伤破坏时,我们修正了计及损伤效应的Bodner-Partom本构模型。

用量子Monte Carlo方法计算氢分子H_2基态(Χ~1∑_g~+)势能曲线

本文用量子MontoCarlo方法中优化试探波函数Ψ_T计算氢分子H_2基态(X~1∑_g~+)势能曲线.文中采用相当简单的波函数形式,并用固定样点优化技术优化试探波函数的参数.确定优化试探波函数后,分别用变分Monte Carlo及固定节面M0nte Carlo计算势能曲线各点能值.二种方法先后得95%和100%的相关能.因此,在量子M0nte Carlo方法中,用本文作者提出的试探波函数计算分子势能面,将会获得很好的结果.从而对分子散射和动力学的研究有重要意义.

边界元法在求解复合材料力学问题中的应用

本文讨论了边界元法在求解复合材料的微观力学、宏观力学和结构力学问题中的应用,并指出边界元法用于分析复合材料及其结构的力学问题的优点和局限性。

建立两相流方程的动力论方法

本文从Boltzmann方程出发建立两相流基本方程。其中碰撞项的处理采用了类似于经典动力论在处理稠密气体输运性质时采用过的方法。动力论方法表明,在气固两相流中除通常的分压和分热流外,还存在碰撞压强和碰撞热流,它们同通常的分压和分热流有本质的差别。本文还讨论了二体碰撞假设和混沌假设在气固两相流中的适用性。

损伤材料裂纹尖端附近的应力场

本文导出了损伤材料的全量理论,导出了全量公式中H的渐近表达式;最后得到损伤材料平面应变条件下的裂纹尖端的应力应变场。

可瘪管定常流动自激振荡

可瘪管流动自激振荡现象在医学和医学工程上有重要意义。本文从一维流动方程出发.分析流动惯性、粘性和管壁弹性相互作用引起的稳定性问题,讨论重力和外压梯度的影响,并通过模型实验,考察不同激振机理引起的振动特性。

布居数反转的非平衡流模拟计算——对流动激光器性能的研究

<正> Ⅰ.引言 40年代不可逆过程热力学已形成一个新的领域。60年代初对扩散、传热、导电、弛豫以及热电、电磁等不可逆过程的各种唯象处理已被综合为统一的体系——非平衡态热力学。由于热机、气体放电、热核聚变以及天体物理、地球物理等方面的研究和发展,流体力学与非平衡态物理学相结合而形成的非平衡流问题的研究已扩展到广泛的领域,流体力学与非平