backward difference quotient是什么意思

网络释义

用法例句

Three-point-backward difference scheme is used in the process of time discritizing.

采用Taylor Galerkin有限元格式进行求解,对有限元等式中关于速度的时间项进行三点向后差分,深入考虑粘性不可压缩流Navier Stokes方程中对流项的作用,利用二阶Taylor展开完成时间项向空间项的转化,采用张量分析的方法推导了N S方程分裂步方法的有限元离散格式,并采用低Reynolds数三维方腔拖曳粘性流[23,24]作为基本算例,检验了这种分裂步方法的稳定性和有效性,同时与大涡模拟相结合对Reynolds数为10000的三维方腔拖曳湍流流场进行了相关的分析,进一步揭示了方腔回流运动的非定常非对称性、流动结构表现为竖轴环流与立面环流相叠加、流速沿垂线分布相对均匀等流动规律,显示了该方法与大涡模拟相结合能够有效地捕捉涡系及其时变过程。

Structured backward error for the linear system A~T Ax = b;

线性方程组A~T Ax = b的结构向后误差(英文)

The method computes ),(00rAkxxmm+ and minimizes the norm of backward error.

该方法利用Lanczos过程产生Krylov 子空间),(0rAkm的一组基,并求近似解),(00rAkxxmm+使系数矩阵A的向后误差范数minFD最小化。

The results are presented that the explicit expression of real skew-symmetric orthogonal matrices for η(2,3)R(X2k,Λ2k) is available and within a factor 2 of the unstructured backward error.

研究了问题:C(R2,3)={ARm×m:AT=-A,ATA=I}有怎样的表达式对其特征值的结构向后误差η(R2,3)(Xk,Λk)=m in{α-1EF:(A+E)Xk=XkΛk,A+EC(R2,3)}有效,对其特征值的无结构误差是否含有2的因子。

Backward Errors and Condition Numbers of Two Systems;

两类系统的向后误差及条件数

Stability of second order backward difference for a partial integro-differential equation with a weakly singular kernel

一类带弱奇异核的偏积分微分方程二阶向后差分格式的稳定性

Fasta Lgorithm of Pseudo-Cholesky Factorization and the Backward Error Analysis for Eigenvalue Problems;

拟Cholesky分解的快速算法与矩阵特征值问题的向后误差分析

Variant expression verification and functional research of ICAT protein before and after monocytic differentiation of HL60 cells

ICAT蛋白在HL60细胞向单核系分化前后表达差异的验证及其功能研究

Difference equations are derived by differential equations.

微分方程经过差分化后引出差分方程。

The Inter-generational Differences in Value Orientation of "after 60" and "after 80" Group

“60后”与“80后”群体价值取向代际差异

wet wash allowance

湿法选矿后的水分容差

He then accounts for the precession of the equinoxes.

然后他解释分点岁差。

It 's a poor sort of memory that only work backwards .

只会向后作用的记忆力可就差劲了。

It goes backward, and is therefore called a precession.

它有前向后推，因此称做一个岁差。

A POSTERIORI ERROR ESTIMATION ON ANISOTROPIC MESH FOR POISSON EQUATION

Poisson方程各向异性网格的后验误差估计

The automotive steering system can vary the overall steering ratio.

首先对差动轮系转向机构进行了静力学和运动学分析,然后建立了简化的动力学仿真模型。

Preliminary study on the differential expression of BMP4 gene before and after differentiation of BMSCs into neuron-like cells in vitro

骨髓基质干细胞向神经元样细胞分化前后BMP4基因差异表达的初步研究

Covariance Analysis of Missile-to-Target LOS Pointing Angle Error for SAM

地空导弹弹目视线指向预定角误差协方差分析

ERROR AT WORK: CONCEPTUALIZATION AND MANAGEMENT;

工作情景中差错概念与差错取向因素分析

Technological Gaps,the Trap of Backwardness and Incentives for Innovation:A Model of Vertical Differentiation

技术差距、后发陷阱和创新激励——一个纵向差异模型

alternating direction explicit difference approximation

交替方向显示差分近似法

partial epimerization

部分差向(立体)异构化作用

The Estimators and Tests of Variance Components in Longitudinal Data Model;

纵向数据模型方差分量的估计和检验