搜索结果: 31-42 共查到“知识库 微分动力系统”相关记录42条 . 查询时间(1.593 秒)
We study statistics of first passage inside a cone in arbitrary spatial dimension. The probability that a diffusing particle avoids the cone boundary decays algebraically with time. The decay exponent...
Dynamical energy analysis for built-up acoustic systems at high frequencies
Dynamical energy analysis built-up acoustic systems high frequencies
2010/12/16
Standard methods for describing the intensity distribution of mechanical and acoustic wave fields in the high frequency asymptotic limit are often based on flow transport equations.
矩形槽道内表面活性剂减阻流体流场特性
表面活性剂 减阻流体 粒子图像测速仪 胶束
2014/3/10
采用粒子图像测速仪对矩形槽道内表面活性减阻流体在流动方向(x方向)与壁 面垂直方向(y方向)所在平面的流场进行了测量，分析了速度、涡量、速度脉 动相关量在流场内的瞬态分布，以及对500幅相同工况的流场进行了统计平均. 结 果显示: 与牛顿流体相比, 表面活性剂减阻流体接近于层流流动，横向速度脉动被大幅 减弱，导致湍流输运减弱，雷诺应力远远小于水. 减阻流体流向速度脉动呈条带 特征，沿流动方向发展，...
参数振动系统响应的频谱成分及其分布规律
参数振动系统 自由和强迫响应 频谱成分 外激励共振 Sylvester理论
2014/3/7
采用Sylvester理论和Fourier级数展开方法分别研究了参数振动系统 自由响应和强迫响应的频谱特性(频谱成分及其分布规律)，讨论了系统稳定性和阻尼对于频 谱幅值的影响，并给出了系统外激励共振条件. 理论研究结果表明：由于参数激励作用使得 系统响应具有多频特点，这些频谱成分与系统固有频率、参数激励频率和外激励频率具有密 切联系，而且其在频域分布也呈现出一定的规律. 此外，参数振动系统具有多个...
Modeling scaled processes and 1/f^b noise by the nonlinear stochastic differential equations
nonlinear stochastic differential power-law distributions
2010/4/2
We present and analyze stochastic nonlinear differential equations generating signals with the power-law distributions of the signal intensity, 1/f^b noise, power-law autocorrelations and second order...
本文对紧致度量空间上的连续半流引入了几类原像熵的定义,并对它们的性质进行了研究.证明了对于无不动点的连续半流而言,这些熵具有一定程度的拓扑共轭不变性. 对这些熵的关系进行了研究并得到了联系这些熵的不等式. 还证明了连续半流与其时刻1映射具有相同的拓扑熵和原像熵.
Adaptive and Recursive Time Relaxed Monte Carlo methods for rarefied gas dynamics
Boltzmann equation Monte Carlo methods Time Relaxed schemes
2010/12/6
Recently a new class of Monte Carlo methods, called Time Relaxed Monte Carlo (TRMC), designed for the simulation of the Boltzmann equation close to fluid regimes have been introduced [16].
非线性无穷时滞微分系统的稳定性
无穷时滞 不等式 稳定性
2007/12/12
本文主要内容是：（１）在局部条件下，建立了一类具有无穷时滞的非线性的正、反向积分微分不等式；（２）结合常数变易法和Ｌｉａｐｕｎｏｖ函数法（不必寻找Ｐ－函数），利用所建立的不等式研究了非线性无穷时滞微分系统的稳定性；（３）举例说明了本文定理的应用和优
几类非线性微分系统极限环的存在性和唯一性
极限环 轨线 极限集 奇点
2007/12/11
给出系统(E$_{1}$), (E$_{2}$)和(E$_{3}$)等非线性微分系统存在闭轨的一些新的判定条件, 推广了非线性微分系统极限环的存在性和唯一性许多这方面研究的结果, 并大大改进了它们的某些条件. 在这个基础上, 还给出了系统(E$_{1}$)和(E$_{2}$)恰有一个极限环的一组充分条件.
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Regularity of coupled two-dimensional Nonlinear Fokker-Planck and Navier-Stokes Systems
Nonlinear Fokker-Planck equations Navier-Stokes equations microscopic variables Deborah number
2014/4/4
We consider systems of particles coupled with fluids. The particles are described by the evolution of their density, and the fluid is described by the Navier-Stokes equations. The particles add stress...
Self-similarity and power-like tails in nonconservative kinetic models
Granular gases overpopulated tails Boltzmann equation
2010/12/6
In this paper, we discuss the large–time behavior of solution of a simple kinetic model of Boltzmann–Maxwell type, such that the temperature is time decreasing and/or time increasing.