查询词典 differential method

In this paper, according toinfinitesimal criterion in symmetry theorem, using differential Wu-method(char-set byMathematica software) and conditions of symmeties of equation u_=Hu_,we givenew potential symmetries for nonlinear telegraph equation u_=F

本文根据对称理论中的无穷小准则，利用微分形式的吴方法(借助于Mathernatica软件编写的求解微分特征列集的程序包)和u_=Hu_型方程对称的存在条件，得到了非线性电报方程u_=F

Poincaré inequalities play an important role in the research of many fields such as in harmonic analysis and in theory and numerical method of differential equations.

Poincar 不等式在调和分析、微分方程理论及其数值方法等领域的研究中具有极其重要的作用。

A thiocyanate differential spectrophotonetry method was used to determine the high content tungsten and satisfactory results were obtained.

采用硫氰酸盐示差分光光度法测定高含量的钨，取得了较好的效果。方法的回归方程较好，相关系数为0.99995；样品回收率为99.3%～100.2%，RSD为0.28

The present investigation deals with the differential spectro photometric method for the determination of high content rhodium using thoron as reagent.

应用差示分光光度法在适当的条件下，测量高浓度元素，相对误差可以降低到百分之一以下，能同重量法和容量法相比。

Image restoration ; image inpainting ; image completion ; variational method ; partial differential equation; total variation ; texture synthesis

图像复原；图像修补；图像补全；变分方法；偏微分方程；全变分；纹理合成

The system with the Bouc-Wen hysteretic force is converted into an equivalent non-hysteretic nonlinear stochastic control system. Then an It stochastic differential equation for total energy is derived by using the stochastic averaging method.

先将该系统变换成等价的非迟滞的非线性随机控制系统，再运用随机平均法导出关於能量的It随机微分方程。

Based on the concepts of total differential and definite integral, a new method is derived theoretically to determine contributions of individual source real or reactive power to branch MVA loss.

本文首先分析了几种常见的网损分摊方法，指出了它们的不足；并在此基础上提出了基于严格数学推导的复功率电源的支路功率分量理论。

Adding boundary conditions in whole equations in the wavelet Galerkin method frequently does with its of differential equations. The result can derive by solving transcendental equation, which make unknow quantity number and the number of system of equation become nonuniformity.

经常采用的小波Galerkin方法对微分方程边界条件的处理，均是将边界条件作为附加方程补充到整体方程中，从而求解超越方程组得到原方程的解，这导致了求解过程出现的方程组个数与未知量个数不一致。

All assumptions for the method are come from the classical theory of the differential equations of motion of any studied element of a structure. Its dynamic stiffness matrix is the transcendental function of frequency. This transcendental eigenproblem can be solved efficiently by applying the well-known Williams-Wittrick algorithm.

该方法的所有假设仅来自于建立该单元运动微分方程的经典理论，所形成的动态刚度阵是固有频率的超越函数，解决这类超越特征值问题的有效方法是Williams-Wittrick算法。

The formulation of power system transient stability preventive control based on optimal power flow is presents in this thesis, in which multicontingency is considered. The infinite dimensions nonlinear optimization problem in which differential-algebraic equations are existed is changing into finite dimensions difference-algebraic equations by implicit trapezoid method.

建立了基于最优潮流的电力系统暂态稳定预防控制模型，通过隐式梯形法将含有发电机动态微分-代数方程和暂态稳定约束的无限维优化问题转换成有限维的常规静态最优潮流问题。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。