principle of conservation

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。

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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。

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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。

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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。

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Directed against the Special characteristic of mountainous area system, according to ecology basic principle, the basic theory of erosion mountainous area soil-water conservation ecological environment construction and sustainable development study must follow from five aspects.

针对山区大系统的特殊性，根据生态学的基本原理，从5个方面阐述了侵蚀山区水土保持生态环境建设与可持续发展研究应遵循的基本理论。

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By analyzing the principle of conservation of mass, we can get the continuity equation of coal containing gas.

通过质量守恒定律，分析得到含瓦斯煤岩的连续性方程。

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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。

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This is the well-known principle of conservation of momentum.

这就是众所周知的动量守恒定律.

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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.

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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。

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In sports biomechanics and physical statistics there are many concepts and principles dealing with physics and mathematics such as free degree, principle of conservation of angular momentum, probability density function, principle of little probability event.

在运动生物力学和体育统计中，有许多物理学及数学的概念和原理，例如自由度、动量矩守恒原理、概率密度函数、小概率事件原理等。

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