principle of conservation of energy

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.

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。

The composites were analyzed by thermal chemical ablation mechanism. The principles of conservation of energy, mass conservation principle, the principle of thermal chemical reaction equilibrium are coupled to thermal chemical ablation model.

可以通过对复合材料热化学烧蚀机理进行分析，耦合能量守恒原理、质量守恒原理和热化学反应平衡原理建立复合材料的热化学烧蚀模型。

The main contents are: 1. a simple temperature and enthalpy chart set up by energy conservation law, after the structure and operating principle has been analyzed as basic three components of the gas turbine& air-compressor, combustion chamber and turbine.

主要研究内容有：1.对燃气轮机的基本组成三大部件&压气机、燃烧室、透平组成结构，工作原理进行分析，根据能量守恒定律建立简单的温焓图。

Second, by analyzing the characteristics of water supply system, energy conservation principle, theoretical models and mathematical models, designed the technical solutions of water supply system.

其次通过分析系统的运行特性曲线、节能原理、特点及其理论模型和数学模型，给出了供水系统的控制方案。

Moreover, the three dimensional finite difference equation of some boundry conditions such as convective, and the the thermal current density was given etc are established according to the principle of energy conservation.

根据能量守恒的原理推导了辐射、对流、给定热流密度等情况下的边界条件的差分方程。

Symmetry in space and time lead to the conservation laws of energy and momentum, which are a general principle across all fields of physics So.

动力学系统的对称性与守恒量研究有着深远的意义，由时空对称性导出的能量、动量等守恒定律是跨越物理学各个领域的普遍法则。

Based on principle of conservation of energy, the thermal field of concrete component can be gotten by the method of finite element.

混凝土构件温度场的计算可以根据能量守恒原理，采用有限元方法进行求解。

The law of conservation of energy also takes a simple form. This is the well-known principle of conservation of momentum.

能量守恒定律也获得简单的形式。这就是众所周知的动量守恒定律。

This is a process for which the principle of the conservation of mechanical energy holds.

这是一个能够应用机械能守恒原理的过程.

The principle of determining thermal conductive factor of original formation through microdifference temperature is conservation of energy ( equal density of geothermal heat flow).

利用微差井温确定原始地层的导热系数，基于能量守衡（地热流密度相等）这一原理。