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In the paper, a mathematical model of borehole gas transient flow in the process of gas drilling is set up and a numerical solution method is put forward on the basis of the unsteady flow theory of compressible fluid.

基于可压缩流体不稳定流动理论，文章建立了气体钻井过程中井内瞬态流动的数学模型并提出了模型的数值解法。

Based on the governing differential equations of the transient problem of temperature fields with phase change, the two-dimensional finite element formula of computing temperature fields around a buried pipeline in permafrost regions are achieved by using Galerkin's method.

根据相变瞬态温度场的控制微分方程，应用Galerkin法推导出计算温度场的二维有限元公式，对中国东北多年冻土区运行30年的加热输油管道土壤温度场进行了计算分析和比较。

Therefore, the analysis of welding temperature field is a typical nonlinear transient heat conduction problem.

因此，焊接温度场的分析属于典型的非线性瞬态热传导问题。

The transient simulation model is based on each component's mathematics model, connection condition of every component and the boundary condition.

又以稳态流动条件为初始条件，根据系统各元件的动态仿真模型，考虑节点的连接和边界条件，建立了系统的动态仿真模型。

In this paper, it includes several parts as follows: Based on the conservation laws of mass and momentum equilibrium in transient liquid pipe flow, the basic equations are introduced in detail.

本文主要从以下几个方面进行了研究：从连续介质理论的质量守恒和动量守恒原理出发，介绍液体管道瞬变分析的基本方程组即波动方程组的详细推导过程。

In the beginning stage of the transient process in the system regulating, owing to that the time constant of the integration element is the greatest, the control effect of PID is inconspicuous, the main control action is the fuzzy control the practical control of the system is independent of the mathematical model of the object, a preferable control effect could be achieved for different kinds of systems.

在开始阶段的过渡过程中的制度规范，由于该时间常数的一体化因素是最大的，控制效果的PID是不显眼的，主要的控制作用是模糊控制的实际控制系统独立的数学模型的对象，最好的控制效果可以实现不同类型的系统。

By using a transient method and fine constantan thermocouples of 0.2mm in diameter,the effective thermal conductivities of sulfur-resisting methanation catalysts have been measured between 313K and 533K.

本文采用动态法原理，用单丝直径为0.2mm的铜－康铜热偶作为测温元件，在313～533K温度区间，测定了耐硫甲烷化催化剂的有效导热系数。

The new transient chaotic neural network algorithm selectively carefully searchs some states to clarify distribution of small and convergence region during chaotic search.

然后根据这些先验信息，更合理地控制暂态神经元的动力学行为。

In this paper, the method for transient characteristic calculation of PWR coolant system is studied and a model is developed.

本论文主要研究压水堆冷却剂系统的瞬态仿真计算方法并提出相应的计算模型。

Objective To find the relationship between correlation and signal to noise ratio of transient evoked otoacoustic emissions.

目的探讨在瞬态诱发耳声发射信号的检测过程中瞬态诱发耳声发射信号总的相关率和信噪比，以及各分频段相关率和信噪比的变化规律和相互关系。

But GST= 0.156, Nm=1. 588. As a result, the foundation of Youyongchi Avicennia marina population was the result of the migration of hypocotyles and human factors.

这项工作可以为海岸防护林中新引进种类的判定以及为研究种群建立者效应方法的确定提供科学依据。

The two-dimensional CDRC-ADI-FDTD update equations for collision unmagnetized plasma are induced. The unconditional stability of the CDRC-ADI-FDTD formulation for collision unmagnetized plasma is obtained by the examples.

推导了碰撞非磁化等离子体中的二维CDRC-ADI-FDTD迭代公式，并用算例验证了碰撞非磁化等离子体CDRC-ADI-FDTD算法也是无条件稳定的。