查询词典 variable density system

In this paper, pressure is used for a primary dependent variable and SIMPLE algorithm is used to simulate the 3-dimensional turbulent flow. In order to advance SIMPLE algorithm to compressible flow, retarded density is utilized.

本文采用SIMPLE方法，以压力为基本求解变量对三维可压缩湍流流场进行数值求解，并采用密度延迟修正将SIMPLE算法扩展到可压缩流动的计算。

Using it we can approximately obtain the expectation of any function,using the certain quantity the random sample particle to express the posterior density of random variable in the model,and can be used in the any non-linear random models.

粒子滤波算法是一种适用于非线性非正态约束的基于模拟的统计滤波算法，可以近似得到任意函数的数学期望，利用一定数量的随机样本粒子来表示模型中随机变量的后验概率分布，并且能应用于任意非线性随机模型。

Considering the randomness of both elastic module and mass density of the structures, the element′s structural stiff and mass matrix have been built, the structure dynamic characteristics is analyzed based on probability, and the digit characteristics of natural frequency random variable is derived from the Rayleigh′s quotient.

利用随机因子法，建立了考虑结构弹性模量和质量密度同时具有随机性时结构的刚度矩阵和质量矩阵；从结构振动的瑞利商表达式出发，利用代数综合法推导出结构特征值随机变量数字特征的计算表达式。

In study of the truss structural dynamic characteristics analysis, randomness of the structural physical parameters and geomtric ones are all considered. The finite element model of the stochastic truss is built and the random functions of its natural frequencies are obtained by use of the Rayleigh quotient. Employing probabilistic distribution function expression for the random functions, through a series of mathematical processing including determination of limits of integrals, variable substitution etc., the probaabilistic density function for the truss natural frequencies are gained to realige accurate calculation for the reliability of the truss natural frequencies.

考虑结构物理参数和几何参数的随机性，通过构建随机参数桁架结构的有限元模型，利用瑞利商公式获得了结构固有频率随机函数的计算表达式，应用随机函数的概率分布函数表达式，通过确定积分区间、变量替换、积分顺序变换等一系列数学上的处理，获得结构固有频率的概率密度函数，进而实现对结构固有频率可靠度的精确计算。

It means to recognize periodicity by analyzing the spectral density of periodically variable sequence, then to judge the measured period true or false through the statistical examination of Fisher's Kappa and Bartlett's Kolmogorovsmirnov.

第三节"波动周期的模型测定法"以"收入—支出"结构和"需求导向"为基本构架，通过建立中国宏观经济波动模型来测定宏观经济内生变量波动的周期长度，这种通过解析思路测定经济变量波动周期的方法，具有理论支撑，其科学性、可信性是显而易见的。

The equations of optimal probability density function of stochastic variable or limit state function are derived by use of the higher moments of the function.

一次二阶矩法主要利用随机变量的均值和方差信息以及分布概型来计算结构的失效概率，属于低阶矩法。

The inverse series is non-linear in the scattered field, which includes the source wavelet and a chosen reference medium's properties.;An imaging subseries of the inverse series for a 1-D constant density variable velocity acoustic medium is isolated and analyzed.

逆系列是非线性的散射场，其中包括小波的来源和选择范围中的属性。；的成像亚逆系列一维密度不断变速声中被孤立和分析。

In this paper,the sum of products equality is proved,and the density function of the linear combination of tow-parameters exponential random variable s is presented.

证明了一个关于积和的等式，并由此推导出双参数指数型随机变量的线性组合的概率分布密度函数

To a one-dimension case, the solution to the distribution of non-monotone function is given; to a two-dimension case, the transformation of random variable and the computation formula of its probability density are given when inverse transform has one value and multiple value, meanwhile, several deductive conclusions are obtained.

从一维与二维随机变量函数的分布的一般求法出发，对一维情形，给出了当随机变量函数非单调时其分布的求法；对二维情形，用随机变量变换的方法分别给出了当逆变换单值与多值时其分布密度的计算公式，并得到了若干推论。

Feldman examined some properties of CLMC and found that it is neither an intensive nor extensive thermodynamic variable, and proposed a simple alteration of CLMC that renders its extensive. However the remedy results in a quantity that is a trivial solution of the realizes compensatory form of density and not as a measure of structure.

David详细研究了CLMC 的特性，发现它既不是一个热力学集中变量也不是一个热力学扩张变量，并提出一种满足热力学扩张特性的补偿形式，但最后证明CLMC 只是熵密度的普通解，不能作为结构测度。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。