TFV：热场变化

在学术研究，尤其是气象学领域，为了书写和使用上的便捷，“Thermal Field Variation”通常缩写为“TFV”。该术语的中文释义为“热场变化”，主要用于描述特定区域内温度分布的动态演变过程，是分析气候变化和环境热效应的重要概念。

Coal fire is a dynamic process caused by spontaneous combustion of the coal layer in various directions, accompanied by the sensible thermal field variation both in time and in space.
煤层自燃是一个动态变化的过程，随着自燃向不同方向扩大或缩小，其热场随着燃烧过程而发生空间变化。
Based on the governing differential equations of unsteady temperature field and the elasticity theory of plane strain problem, finite element equations of temperature gradient and thermal stress field are given by the variation principle.
按非稳态温度场问题的热平衡控制微分方程和弹性力学平面应变问题的计算理论，应用变分原理给出了温度场和应力场的有限元计算列式。
Three factors, namely copper content, pressure and speed, were considered to study their influence on the thermal properties of the composites. The frictional temperature field distributions and variation rules were analyzed based on the simulation results.
分别考虑了Cu粉含量、压力、转速三个因素对复合材料导热性能的影响，并根据模拟分析的结果分析了其温度场分布及其变化规律。
The mathematic model of SMPS for stable thermal field is built. And the equivalent functional equation is obtained by using the variation theory.
本文首先根据传热学理论，分析开关电源的散热途径，建立开关电源稳态热场的数学模型，并应用变分原理得到其等价的泛函形式。

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