一阶偏微分方程是最简单的一类偏微分方程。一阶偏微分方程的几何理论有悠久的历史渊源，以后经过É.(-J.)嘉当等人的发展，在几何学、力学和物理学中都有重大的意义。
一阶马尔可夫型式 first order Markov scheme 一阶偏微分方程 first order partial differential equation 一阶齐次非平稳过程 first order homogeneous nonstationary process ..
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partial differential equation of first order 一阶偏微分方程 thermocouple pyrometer 热电偶高温计 ..
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根据一阶拟线性偏微分方程组的特征理论，讨论内弹道两相流方程组的类型。
Following the theory on characteristics of first order quasi-linear partial differential equations, classification of the balance equations for two-phase flow in interior ballistics is discussed.
传输线可以看作集中参数二端口网络的级联，其数学模型—电报方程是一阶双曲型偏微分方程组。
Telegraph equations, can be looked as cascade connection of two-port network of lumped circuit of transmission line, is a hyperbolic partial differential equations.
本文讨论了一交通模型的一阶拟线性偏微分方程激波产生唯一性的条件并给了严格的证明。
A condition of a one-order quasilinear partial differential equation of a traffic model forming unique shock wave is given end proved.
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