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Conjugate gradient methods are very important for solving nonlinear optimization problems.

梯度法是解决无约束非线性最优化问题的重要的方法之一。

The forced oscillators have been investigated with the use of the conjugated arithmetic operators and the matrix of the normal form theory.

第三章将非线性系统转换为一个四维的一阶系统,再进行非线性变换,将规范形理论中的共算子法和矩阵表示法联合一起应用,研究了强迫振动问题。

The key idea is that the proposed numerical scheme involves the operator splitting technique, balance tensor diffusivity, Runge-Kutta time-stepping method, and a conjugate gradient iterative solver.

此法最主要的概念是使用一种分离的离散式、数值平衡扩散式、时间前进法及共梯度法来求解。

Secondly,we prove that there exists one to one correspondence between the charac-teristic subspace of Jacobi matrix of Hamiltonian system and that of its conjugatematrix.

其次,证明哈氏系统Jacobi矩阵的特征子空间与其共矩阵的特征子空间是一一对应的。

At least one layer of said I-Polar is optically anisotropic and is made by means of Cascade Crystallization Process, is characterized by a globally ordered biaxial crystalline structure with an intermolecular spacing of 3.4 } 0.3 A in the direction of one of optical axes, is transparent in the visible spectral range, and is formed by rodlike supramolecules representing at least one polycyclic organic compound with a conjugated -system and ionogenic groups.

所述I-Polar中至少有一层是光学各向异性的,并通过级联结晶工艺制得,其特征是在一个光轴方向上具有3.4±0.3的分子间间距的全局有序的双轴晶体结构,该层在可见光光谱区域内是透明的,并由代表至少一种具有共π体系和离子型基团的多环有机化合物的棒状超分子形成。

The reaction barrier will be lowered by the substituents that delocalize the unpair electron in Pz orbital of the central carbon atom.

当R^1,R^2位置是甲基时,由于碳原子的pz轨道与甲基的一个C—H键轨道间存在强的超共效应,从而可以较大程度地降低α-氢转移反应的势垒。

This thesis mainly considers how the arithmetical conditions of conjugacy classes and element order s of a finite group influence its structure respectively.

本文主要研究有限群中共类和元素的阶的算术条件对群结构的影响。

Through creating a differential equation whose oscillation is equivalent to the impulsive equation, or considering the relation between impulsive points and delay, we get some sufficient conditions for the oscillation of the equation.

第二章讨论了二阶自共脉冲微分方程,通过建立与之振动性等价的微分方程,或考虑脉冲点与时滞间的关系,我们得出方程振动的一些充分条件。

This paper improves the iterative format of the symmetric successive overrelaxation PCG method,as a result the computation is reduced by 8%~50%.This paper also presents some key subroutines for application of the SSOR PCG method to the solution of finite element equations.

本文改进了对称逐步超松驰预处理共梯度法的迭代格式,可节省计算量8%~50%,并给出应用SSORPCG法求解有限元方程组时的几个关键子程序。

D resistivity forward modeling ; Finite-element ; Secondary potential ; Symmetric successive overrelaxation ; Conjugate gradient.

电阻率三维正演;有限元;异常电位;对称超松弛;共梯度

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Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在,'歼灭战perfuming自己与胡努特,那麼,他来到和SAT 。

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三叶草是爱尔兰和圣特里克节的标志同时它的寓意是带来幸运。3片心形叶子围绕着一根断茎,深绿色。