The modulational instability of one-dimensional broad optical beams in biased two-photon centrosymmetric photorefractive crystals under steady-state conditions has been investigated.

1、

The results indicate that the type-ⅰ phase-matched NPS ring is centrosymmetric with respect to the pump beam on the observation screen.

结果表明，Ⅰ类非共线相位匹配的参量超荧光关于抽运光中心对称。

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2、

The optimal approximation solution to a given matrix was provided in the solution set. The results were then applied to solve the centrosymmetric structural dynamical model updating problems.

然后，将结果应用于中心对称结构的动力模型修正问题中，对给定的矩阵束，求出满足特征方程且具有中心对称特性的最佳矩阵束逼近。

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3、

We discovered that: ( 1) The values of the bond length and bond angle, are axisymmetric equivalent or centrosymmetric equivalent.

发现：（1）所选构型的键长值和键角的大小，满足于中心对称相等或轴对称相等。

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4、

The Drazin Inverse of a Centrosymmetric Matrix

中心对称矩阵的Drazin逆

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5、

Refinement of the crystal structure of rbi0_3 · 2hi0_3 and its centrosymmetric degree

RbIO3·2HI03晶体结构的再修正及其中心对称度

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6、

The results determined by x ray single crystal diffraction show that the supermolecular crystal is a centrosymmetric structure with a space group Pnab.

经X衍射单晶结构测定，晶体为中心对称结构，空间群为Pnab；

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7、

The space-charge field with a higer-order nonlinearity in biased centrosymmetric photorefractive media is presented.

给出了中心对称光折变晶体中屏蔽孤子的高阶空间电荷场。

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8、

Then the direct centrosymmetric solutions were obtained by applying the iterative method in finite steps an arbitrary initializing centrosymmetric matrix.

使用该方法，对任意给定的初始中心对称矩阵都可在有限步内迭代求出它的中心对称最小二乘解。

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9、

另外，当A或P为斜中心对称矩阵时也有相似的结论。

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10、

Computation of the Product of Centrosymmetric Matrixes

关于中心对称矩阵的矩阵与矩阵乘积的计算

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11、

In this paper, an iterative method is presented to find the least squares centrosymmetric solution to a kind of matrix equations.

本文提出了求一类矩阵方程组的最小二乘中心对称解的一种迭代法。

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12、

It is composed of five parts: 1. The centrosymmetric structural dynamical models updating were studied in the paper.

全文工作主要由以下5个部分组成。1.中心对称结构的动力模型修正问题。

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13、

A class of inverse problems for the centrosymmetric matrices and anti-centrosymmetric matrices

中心对称与反中心对称矩阵的一类反问题

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14、

Laser power characterization method for fabrication of centrosymmetric CR-DOEs mask by polar laser direct writing

极坐标激光直写法制作圆对称连续衍射元件掩模的能量表征方法研究

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15、

Axisymmetric and centrosymmetric arrangement of six cyclones are investigated in the research.

在该实验台上，对比研究了六个旋风分离器轴对称布置和中心对称布置两种型式。

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16、

The necessary and sufficient condition for centrosymmetric solution of matrix equation was presented and general solutions were obtained.

先讨论一类矩阵方程存在中心对称解的充分必要条件，给出解的一般表达式，并在解集合中给出了与给定矩阵的最佳逼近解。

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17、

The Inverse Problem of Anti-centrosymmetric Matrix with a Sub-matrix Constraint

子矩阵约束下反中心对称矩阵反问题

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18、

Theoretical Studies on Electronic Spectrum and Third-order Nonlinear Optical Properties of Centrosymmetric Pyrazine Derivatives

中心对称吡嗪衍生物电子光谱和三阶非线性光学性质的理论计算研究

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19、

The Iterative Methods for Centrosymmetric M-matrices On Shifting of Linear Feature

中心对称M-阵的线性方程组的迭代解法线状要素移位的研究

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20、

The Fast Algorithms of Square Roots of Generalized Centrosymmetric Matrices

广义中心对称矩阵平方根的快速算法

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