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QI An-shen 《理论物理通讯》1988,9(2):235-244
The wave front solutions of a Fisher-like equation with highly nonlinear diffusion is studied. The linear stability of the waves is investigated by employing Galerkin Procedure. The global stability. problem is also investigated by numerical simulations. The results demonstrate that the waves possess some special characteristic features, which are different from those of semiLinear Fisher equation. 相似文献
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证明了在一般不计辐射的冲击波阵面后,存在一个热传导波,它的波速完全和冲击波的一致,但阵面后的温度分布有其自己的规律。 相似文献
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This paper studies the response cumulants for a kind of special nonholonomic systems under non-Gaussian, delta-correlated excitations. We present a new methodology for formulating the equations governing the evolution of the response cumulants of the stochastic dynamic systems. The response cumulant differential equations (CDEs) derived can be used to calculate the response cumulants for both linear and nonlinear systems. One example is given to illustrate how to use the CDEs for calculating response cumulants. 相似文献
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General solutions are obtained for a class of quantum dissipative systems. This is achieved by calculating the characteristic function in the Heisenberg picture. The irreversible behavior of these systems is nalyzed. The general formalism is applied to some typical examples and the influence of noise on these systems is gained. 相似文献
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本文研究激光维持爆震波阵面的紫外辐射强度、吸收系数和穿透LSD波阵面的紫外辐射功率密度。考虑了韧致、自由-束缚和线跃迁三种过程,给出的紫外辐射功率密度表明,LSD波阵面紫外辐射值得重视。 相似文献
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环形激光光束的波前复原算法比较 总被引:2,自引:1,他引:1
针对环形激光光束净化自适应光学系统中的波前传感器子孔径与变形反射镜驱动器布局,仿真比较了直接斜率法、区域法的Fried模式和Southwell模式三种波前复原算法, 其中, 直接斜率法的波前校正能力及稳定性均为最好。 相似文献
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Axel Schulze-Halberg 《Foundations of Physics Letters》2000,13(3):265-277
We present a method for finding exact solutions of relativistic wave equations (RWE) that are given by finite normal series (FNS). Using a certain factorization method we rewrite the most general potential for which the RWE is solved by a FNS function in a canonical form such that FNS solutions for rational potentials can be obtained by solving simple algebraic equations. 相似文献
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有限系统的电子结构研究 总被引:3,自引:2,他引:1
选取二维和三维亚方晶格作为有限系统的集团模型,在紧束缚近似下,分别计算了不同尺寸集团的态密度。探讨了态密度与集团大小的关系以及受表面效应的影响。 相似文献
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The impulse wave is made by the weak normal shock discharge from an open end of a shock tube. In order to understand the dynamic characteristics of the impulse wave impinging upon a flat plate, experiments are performed over the shock Mach number range from 1·01 to 1·20. A flat plate is placed downstream, normal to the axis of the shock tube, to simulate the impulse wave impingement on an object. The distance between the exit of the shock tube and flat plate is changed. The baffle plate is installed at the exit of the shock tube. The sizes of the baffle plate and impinging flat plate are varied to investigate the magnitude of the impulse wave impinging upon the flat plate. Computational analysis is applied to model the flow field subject to unsteady, axisymmetric, inviscid, compressible, equations. Computational results well predict the experimented dynamic behavior of the impinging impulse wave. The impulse wave impinging upon the flat plate has a sharp peak of very short rising time and its magnitude decreases with distance from the center of the flat plate. The magnitude of the impulse wave impinging upon the flat plate can be predicted by the empirical equations that are developed in the present study. 相似文献