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Based on the theory of tidal flow and sediment motion, a 2-D depth-integrated mathematical model for the Jiaojiang Estuary is developed by using explicit scheme of finite difference on the triangle elements. The results show that the rotary currents occurring in this area can be simply and effectively simulated by the model. Meanwhile, the suspended sediment concentration simulated is in agreement with the field data.

本文根据椒江口实测水文地形资料，从平面二维水流泥沙基本方程和基本理论出发，采用三角单元有限差分法对水流泥沙方程显示求解，对椒江口潮流泥沙进行了数值模拟，模型简单实用，较好地再现了具有旋转潮波性质的椒江河口水流运动特征，含沙量场也得到了基本正确的反映。

The flood activity is one child system in this system, it also has an extremely strong nonlinearity relation with the weather system, and it is very difficult for the analysis means based on explicit function and linear measure and the mathematical model in simulating the gradual progress course and gradual progress method of flood reasonably.

水文水环境系统是一类与自然资源、生态环境和社会活动紧密相关的、极其复杂的大系统，洪水活动作为该系统的一个子系统，还与天气系统具有极强的非线性相关关系，这使得基于显函数和线性假设的分析手段与数学模型很难合理地模拟洪水的演进过程和演进规律。

An exponent is a mathematical notation indicating the power to which a number is to be raised.

指数是一个数学符号，表明数字增倍的量。

"All results of the profoundest mathematical investigation must ultimately be expressible in the simple form of properties of the integers.

"，"最深奥的数学研究的全部结果，最终都一定可以表示成整数性质的简单形式。

Worked out the preliminary probing or studying therewith the expressible mathematical model, used the remote sensing technology to study the relation between the density of population and the intensity of urban hot-island effect.

在利用遥感技术研究城市人口分布密度和热岛强度之间密切关系的数学模型的数值表达上，做了初步的研究和探索。

In this paper, mathematical analysis, linear algebra is more material as the foundation, on the basis of previous studies, will solve a number of the function extreme value methods, such as distribution method, elimination method, the discriminant method, mean inequality method, the geometric method, vector method and derivative method, and so to summarize, and on this basis is given for each method the corresponding examples to illustrate for readers to reference and understanding.

本文以数学分析、线性代数更教材为基础，在前人研究的基础上，将求解函数极值的若干方法，如配方法、消元法、判别式法、均值不等式法、几何法、向量法和导数法等等进行归纳总结，并在此基础上针对每一种方法给出相应的例子加以说明，以便读者参考和理解。

Is also a function of extreme value theory, and many other mathematical theory of power series basis.

也是函数的极值、幂级数理论等众多数学理论的基础。

One approach, from mathematical point of view, is to translate the test into comparson of the constant a and proportion b of linear regression by using F test .

数学上该问题转化为对回归直线的常数 a和比例系数 b两组随机样本的 F检验。

In the first of this paper, by the partial differential equations of heat exchange and finite element method, the mathematical causes which result in calculative errors of temperature fields as different initial temperature on the joint face of concrete construction was analyzed.

本文首先从热传导的偏微分方程和有限元法入手，分析了分期浇筑混凝土结合面上节点初始温度取值不同时，造成温度场计算结果偏差的数学原因。

In order to facilitate the analysis and design, mathematical models of control system are established.

为了便于分析与设计，文中建立了控制系统的数学模型。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。