守恒律

In chapter 4, the multisymplectic Hamiltonian system and its associated conservation laws are simply presented.

第四章简单介绍了多辛哈密尔顿系统及其相关的守恒律。

In chapter III,bisection methods of conservation lawsare designed.

在上述方法的启发下，第三章设计了守恒律方程的二分法。

I of course include the usual formulas for solutions of the usual linear PDE, but also devote large amounts of exposition to energy methods within Sobolev space, to the calculus of variations, to conservation laws, etc.

当然，这本书中包含通常的线性偏微分方程的解的通常的表达式，并且对在索伯列夫空间中的能量估计，变量的计算，守恒律等进行了阐述。

Canonical equations for the SRLW equation are presented which possess some conservation laws by canonical transformations.

通过对SRLW方程作正则变换，得到了它的正则方程组及其几个守恒律。

We show that in the presence of high potential steps the Dirac equation has solutions which violate the principle of charge conservation. This paradoxical situation has no completely satisfactory physical explanation within a one particle interpretation.

我们证明在高势能步幅的情形下Dirac方程存在违返电荷守恒律的解，这种荒谬的结果没有任何令人满意的的物理解释在描述单个粒子的时候。

Chapter 5 is to study the group classification and the classification of conservation law for the nonlinear differential equations.

第五章主要研究非线性微分方程的群分类和守恒律分类。

Nonlinear hyperbolic conservation law is one of the core problems in nonlinear PDEs, it has very important physics background.

非线性双曲型守恒律是非线性偏微分方程中的核心问题之一，它有很强的物理背景。

In the seventh chapter, the infinite conservation law of the obtained equation hierarchy in chapter 4 by use of direct method.

在第七章中，利用直接方法导出了第四章中所得方程族的无穷多守恒律。

Inhomogeneous hyperbolic conservation law; viscosity solution; weak solution; entropy-entropy flux; maximum principle; Young measure; Dirac measure; compensated compectness

基础科学，数学，数学分析非齐次双曲型守恒律；粘性解；弱解；熵-熵通量；极值原理； Young测度； Dirac测度；补偿列紧理论

This thesis is concerned with the structure and behaviors of the waves of global weak entropy solutions for an initial-boundary value problems of scalar conservation laws with weak discontinuous flux function.

本文研究在流函数具有弱间断点的条件下单个守恒律初边值问题整体弱熵解的结构和波的行为。

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％。