守恒

The characteristic approximation is used to handle the convection part along the direc-tion of fluid namely characteristic direction to ensure the high stability of the method in approximating the sharp fronts and reduce the numerical diffusion; The mixed finite element spatial approximation is employed to deal with diffusion part and approximate the scalar unknown and the adjoint vector function optimally and simultaneously; In order to preserve the integral conservation of the method, we introduce the modified characteristic method.

该方法对方程的对流部分沿流体流动的方向即特征方向离散以保证格式在流动的锋线前沿逼近的高稳定性，消除数值弥散现象；对方程的扩散部分采用最低次混合有限元方法离散、同时以高精度逼近未知函数及未知函数的梯度；为保证方法的整体守恒性，在格式中引入修正项。

The physics \\"energy conservation\\", the \\"law of conservation of mass chemistry\\" Philosophy of \\"god is impartial to everybody!\\"

物理学中的\\&能量守恒定律\\&、化学中的\\&质量守恒定律\\&；哲理中的\\&上天对每一个人都是公平的！\\&

Based on the theory of the conservation law of mass, the Darcy law and the conservation law of energy, the author designed a procedure using finite element method to calculate velocity field and temperature field of the Youjiang basin during the Yanshan period.

1以物质守恒定律、达西定律和能量守恒定律为理论依据，采用有限元数值计算方法，设计编制了计算地形驱动的流体流动和热传输的计算机程序，用来计算右江盆地燕山期地形驱动流体系统的速度场和温度场。

In order to study the permission quantity of heat transfer from high temperature smoke in the process of zinc refining in lead column, a control model was established based on the law of mass conservation and the law of energy conservation.

为了研究铅塔锌精馏过程中高温烟气供给塔盘的允许传热量，基於质量守恒和能量守恒定律，建立了铅塔锌精馏过程高温烟气供热控制模型。

But when the pressure is bigger than 30MPa, there is a contrary phenomenon. The flow rate, particle size distribution and void fraction of the extraction bed have the complicated effect. 3Based on the broken-intact cells model, a dynamic model based on differential mass balance equation is developed according to the law of conservation mass. The expression of mass transfer flux is given by the analysis the process and the necessary hypotheses. The extraction process is described, and the expression of extraction rate of diosgenin is given.

3在引入破碎—完整细胞结构理论的基础上，根据质量守恒原理建立了基于微分质量守恒方程的动力学模型，通过对萃取过程的分析和必要的简化、假设，给出了不同阶段传质通量的表达式，在此基础上描述了萃取过程，并给出了超临界流体萃取薯蓣皂甙元的萃取收率表达式。

If one single particle collides with another single particle, their motions should obey both energy and momentum conservations.

两个单粒子的碰撞运动，既要服从能量守恒，又要服从动量守恒。

As a mesoscale simulation method Lattice Boltzmann Method based on mass and momentum conservations is used to simulate the complex fluid, in which Continuity and the Navier-Stokes equations can be conformed.

作为一种介观模拟方法，格子玻尔兹曼方法在保证质量守恒和动量守恒的前提下，模拟的复杂流体能够满足流体力学中的连续性方程和Navier-Stokes 方程。

As a mesoscale simulation method Lattice Boltzmann Method based on massand momentum conservations is used to simulate the complex fluid, in which Continuity andthe Navier-Stokes equations can be conformed.

作为一种介观模拟方法，格子玻尔兹曼方法在保证质量守恒和动量守恒的前提下，模拟的复杂流体能够满足流体力学中的连续性方程和 Navier-Stokes 方程。

Between above two cases, if the single particle collides with the crowded-particles in one, or two dimensional-links, their motions might obey either energy, or momentum conservations.

介于上述两者之间，一个单粒子与一维紧密相连的粒子群的碰撞运动，不是动量守恒可以忽略，就是能量守恒可以忽略。

The Bucher diagrams of the Carnot cycle are used to present vividly three-heat-source cycle s.

应用卡诺循环的Bucher图形象地表示出三热源循环，并由图中的相似三角形直接导出三热源循环的能量守恒方程、熵守恒方程和性能系数。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。