机械能是守恒的，因为重力是守恒力。
Mechanical energy is conserved, because gravity is a conservative force.
“守恒”这个词来自于物理学;,如果说能量守恒。
Well, the word conservative comes from the idea in physics; if the conservation of energy.
动量守恒，这就叫作动量守恒。
Momentum is conserved, and that's called the conservation of momentum.
角动量，在点Q守恒，也只有在点Q守恒。
Angular momentum is conserved about this point Q, but only about that point Q.
这就为研究激光的工作人员出了一个难题：如果能量输出有两种形式，他们怎样运用电荷守恒和能量守恒定律呢？
This posed a conundrum for researchers working with the laser: How were they to apply the laws of conservation of charge and conservation of energy with two forms of energy output?
显然是质量守恒，而不是摩尔数守恒。
在物理中我们并非坚信，能量是守恒的，这并不是一定的，动能不一定守恒。
Now, in physics we do believe very strongly in the conservation of energy, not necessarily in the conservation of kinetic energy.
动量并不严格守恒，而动能也从不会，完全守恒，它只是一种近似。
So momentum is never exactly conserved, and kinetic energy is never exactly conserved either, so it's only an approximation.
动量是守恒的，因为它不受外力，因此动能也是守恒的。
Momentum is conserved, because there was no net external force, so now kinetic energy is also conserved.
通过推导证明了只有使内边界数值通量守恒才能使并行后的总体数值格式是守恒的。
Through derivation the present thesis proves numerical value flux conservation of sub-domains interface boundary can make parallel numerical schemes conservative.
根据基本的质量守恒定律、能量守恒定律以及一些经验公式等建立了系统的动态数学模型。
Based on the mass conservation law, the energy conservation law and some empirical equations, the dynamic model is built.
以双流体模型为基础，通过质量守恒方程和动量守恒方程的耦合，提出了液液两相系中弥散传质的连续波模型。
A continuity wave model is put forward for the dispersion process of liquid-liquid two-phase system, by coupling mass and momentum conservation equations of two-fluid model.
证明了只有轻子荷才是严格守恒的，各代轻子数分别守恒只能近似成立。
It is proved that only lepton charge is strictly conserved and the individual conservation of the lepton number of every generation of leptons hold only approximately.
电荷不仅由衰变“前”到衰变“后”是守恒的，而且在衰变过程的每一个中间的阶段也都是守恒的。
The charge is conserved not only from "before" to " after " but also at every intermediate stage of the process.
本文考虑一维单个守恒律方程，对其设计了一个基于熵耗散的非线性守恒型差分格式。
In this paper, we are concerned with scalar conservation law in one space dimension, we design a nonlinear conservative difference scheme based on entropy-dissipation.
本文考虑一维单个守恒律方程，对其设计了一种非线性守恒型差分格式。
In this paper, we are concerned with scalar conservation law in one space dimension. We design a nonlinear conservative difference scheme.
介绍了动量守恒定律建立的历史过程，对动量守恒定律进行了讨论，并对动量守恒定律存在的内在实质作了探讨。
This paper introduces the history of conservation law of momentum, and discusses the conservation law of momentum and the substance of conservation law of momentum.
文章系统地阐明了机械能守恒定律无条件服从力学相对性原理，若总机械能在一个惯性系守恒，它就在所有惯性系守恒。
In this paper it is explained that the law of conservation of mechanical energy must Obey the relativity principle of mechanics.
将这种新的格式构造方法应用于带有源项及刚性源项的守恒律方程，得到了相应的时空守恒格式。
This new constructing approach is applied to conservation laws with source terms or stiff source terms, and the corresponding space time schemes are obtained.
基于能量守恒、动量守恒、质量守恒方程，建立描述绝热毛细管特性的数学模型。
The adiabatic capillary tube model was established based on energy conservation, mass conservation and momentum conservation equations.
通过求解质量守恒、动量守恒、能量守恒方程，获得液膜厚度、速度与温度等参数。
Conservation of mass, momentum, and energy are used to solve for the liquid film thickness, velocity, and temperature.
电荷守恒对应于时间对称性，而电流守恒则对应于空间的对称性。
The conservation of charge corresponds to time symmetry, while conservation of current corresponds to space symmetry.
本文对电荷守恒定律和磁链守恒定律从数学方面作了较深入的论证，并给出了其物理意义。
The conservation principles of charge and of flux linkages are proved mathematically, and their physical meanings are given in the paper.
必须记住，动量守恒甚至对于非弹性碰撞也是成立的，尽管这时动能已不守恒。
It is important to realize that momentum conservation applies even to inelastic collisions, in which the kinetic energy is not conserved.
综合评述了守恒型差分格式及保真模型的研究进展，评价了守恒型差分格式及保真模型在地球流体动力学数值模拟中的作用。
The research of conservation difference schemes and high fidelity model design is recounted and the related remark about the GFD numerical model approaching is presented in this paper.
利用物质守恒原理，以鸡舍为半封闭系统，分析了鸡舍内NH3在通风状态下的动态守恒情况。
Taking the henhouse as semi-obturation system, dynamic conservation of NH3 in henhouse under ventilation condition was analyzed based on the law of conservation of mass.
从对称性原理出发，证明了能量守恒定律，并对时间平移对称性与能量守恒作了简单的几何表述。
From the principle of symmetry, law of conservation of energy is proved. And have a simple geometric express for time translation symmetry and conservation of energy.
本文从爱因斯坦速度变换式、相对论中的牛顿第二定律及普遍的能量守恒定律导出质点组的动量守恒定律。
In this paper, the conservation law of momentum is derived from Einstein's transformation law of velocities, Newton's second law in relativity and general conservation law of energy.
在文中引入了扩展全空间概念，由此得到电荷守恒和电流守恒的一般形式。
This paper introduces the concept of extended total space, and then we extend conservation of charge and conservation of current to general case.
在文中引入了扩展全空间概念，由此得到电荷守恒和电流守恒的一般形式。
This paper introduces the concept of extended total space, and then we extend conservation of charge and conservation of current to general case.
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