对称

The aim of this contribution is to draw a general perspective of the liveness and safeness for Asymmetric Choice nets.

文章讨论了活性具有单调性的非对称选择网活性与安全性的条件，并给出一个多项式时间算法来判定一个给定的非对称选择网是否是活的、安全的与活性满足单调性。

Symmetry group is semisimple, the system has a fine cascade decomposition that is a qasi-parallel decomposition, which is corresponding to the decomposition of linear systems under the semisimple symmetry algebra.

由于对称代数对线性系统的结构有重要作用，特别是当该代数半单时，系统可分解为多个独立的子系统，因此如何就给定的线性控制系统构造出其对称代数具有重要意义。

In addition, the connection of complex matrices and complex symmetric matrices , namely every complex matrix is similar to a complex symmetric matrix, is found.

另外，本文找出了复对称矩阵与一般的复矩阵的关系，即每个复矩阵都相似一个复对称矩阵。

Tensors of this kind are called antimetric or skew -symmetric.

这类张量叫做反对称张量或斜对称张量。

Our conclusion is : For general transport equation and some special transport equations (slab geometry, spherical symmetry, pillar symmetry) we can evaluate some relevant physical quantities and geometrical properties from the exiting photon flux. The method we will use is to transform the transport equation into integral equation by integrating it along its characteristics, then we prove the nonlinear operator K is monotone and continuous with respect to its arguments and obtain the existence of K~-1. Consequently, we can evaluate some relevant physical quantities and geometrical property of the medium.

我们得到的结论是：无论对于一般的迁移方程，还是当介质具有某种对称性时(板对称、球对称、柱对称)的迁移方程，我们都可以根据泄漏的光子流估计介质各种相关物理量和几何特性，所用方法都是将迁移方程通过沿特征线积分转化为积分方程的形式，然后证明非线性算子K关于自变量的单调性和连续性，从而得到逆算子K~(-1)存在，进而达到估计介质各种相关物理量和几何特性的目的。

He also obtained similarity solutions for longitudinal and spherically symmetric motions.

他也得出了关于纵向对称运动和球面对称运动的类似解。

By making use of this developed DRS-Zhao-Wu-Cai method, we re-investigate in Chapter 6 the quantum thermal effect of Dirac particles and photons in some spherically symmetric black holes of Vaidya-type, and demonstrate that the Hawking radiation is asymmetric with respect to their different components in the advanced EF coordinate system.

用这个发展了的DRS-Zhao-Wu-Cai方法，在第六章中重新研究了Vaidya-型球对称黑洞中Dirac粒子和光子的量子热效应，表明在EF坐标系中Hawking辐射对它们的不同分量是不对称的。

Based on Dobiasch and Maisons' work, Gibbons and Wiltshire discussed the five-dimensional spherically symmetric black hole.

在标准Kluza-Klein框架下，Dobiasch和Maison讨论了一般球对称问题；在Dobiasch和Maison的工作基础上，Gibbons和Wiltshire讨论了五维球对称黑洞问题；Gibbons和Maeda给出带有任意耦合常数的高维引力模型及黑洞解。

Using the statistical entropy of the spinning gravitation field of static spherically symmetric black hole,the radiant emittance of static spherically symmetric black hole is calculated,and we obtain a conclusin that the radiant emittance of black hole is proportionate to quartic power of temperature of the event horizon of the black hole.

利用静态球对称黑洞引力自旋场的统计熵，导出静态球对称黑洞引力自旋场的辐出度，得到了黑洞的辐出度与黑洞视界温度的四次方成正比的结论。

First of all, we use approximate method of the super-symmetric quantum mechanics to calculate super-potential and eigenvalues of spheroidal functions in the first several terms. Further more , we derive the ground eigenfunction in the first order terms, which is very useful for applying of the spheroidal wave function probably

首先我们使用近似的超对称量子力学方法计算出前几阶超势和广义椭球函数的本征值；接着根据之前所求得的超势和本征值推导出广义椭球函数一阶基态波函数，该超对称量子力学方法的引入及一阶基态波函数形式将有利于广义椭球函数深入研究

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。