数学模型

Based on detailed mathematical model of the heat and mass transfer processes in packed-type counterflow liquid desiccant systems, a set of linear ordinary differential equations describing the transfer processes is obtained by some appropriate simplications.

在建立逆流填料式液体除湿系统传热传质过程的数学模型基础上，通过合理的简化处理，导出了描述这一热质传递过程的常微分方程组，得到了相应的解析解；并与精确数学模型的数值解进行了对比，二者具有良好的吻合性；利用解析解分析了各参数对除湿性能的影响；所得解析解具有较好的理论及应用价

Based on detailed mathematical model of the heat and mass transfer processes in packed type counterflow liquid desiccant systems,a set of linear ordinary differential equations describing the tramsfer processes is obtained by some appropriate simplications.

通过对逆流填料式液体除湿系统传热传质过程数学模型的合理简化，推导出描述这一热质传递过程的常微分方程组的分析解，并与未简化数学模型的数值解作对比，二者具有良好的吻合性。

A mathematics model in the form of differential equation was constructed base on the theory of motor timing. Then the model was changed into the form of transfer function.

应用交流电机调速理论，建立了船舶电力推进系统的微分方程形式的数学模型，再将其转化为传递函数形式的数学模型，应用Matlab语言进行了动态特性仿真计算。

This makes more and more people pay more attention to studies and applications of numerical simulation in thermal recovery. In this research, we have developed a reliable mathematical model for thermal recovery, which takes a full consideration of the effect of viscos, gravitical and capillary forces on the three-phase flow of gas, water and oil, the effect of the temperature on the medium characteristics of liquid and solid, the phase equilibrium of gas-liquid in each component, heat transportation including connection, conduction and radiation as well as heat losses in both the overburn and underlying strata. In the space discreation of the mathematical model, we have proposed a new method based on the improvement of the conventional nine-points difference approximation, which has a higher difference accurancy.

本项研究以热力采油的主要机理为基础，充分考虑在粘性力、重力和毛管力作用下油水气三相流动，考虑温度对各种流体和固体介质物性的影响，考虑每一组分中汽液两相的相平衡，考虑热在地层中的传导、对流和辐射以及上下盖层的热损失，利用热力学第一定律、质量守恒定律和流体迁移定律，建立了正确可靠的注蒸汽数学模型；在对数学模型进行空间离散时，利用控制有限体积积分法，对以往的九点差分近似作了合理的改进，使其具有较高的差分近似精度：结果表明，该公式的近似精度要比以往文献中所给的九点差分近似精度高，可以认为，在油藏数值模拟中，如果遇到非均质情况，使用这种九点差分近似更合理。

The course is divided into two parts: Part 1: Signal representations - discrete and continuous; System representations; Linear time invariant systems (Superposition, Causality, Impulse response, Stability, Transfer functions); Discrete and continuous convolution.

通过 本课程的学习，学生应能掌握信号分析与线性系统的基本理论及分析方法，应能建立简单电路与系统的数学模型，并对数学模型求解，为后续课程的学习打好基础。

When the model is established, this thesis calculates the key tache that is traction dynamotors voltage with the method of simulating the adjust characteristic of dynamotor and works out the whole mathematical model.

本文还通过比较数学模型对机车传动系统模拟的记录和东风7型机车水阻试验记录，验证了数学模型的正确性和精确程度。

Introduce the elementary knowledge related to dimension chain; Propose mathematical model of dimension chain, and analyze the process to build mathematical model; Analyze the search process to generate dimension chain using deep first search method.

介绍尺寸链的相关基础知识；提出尺寸链数学模型，分析了以图论为基础的数学模型的建立；分析了以深度优先搜索法进行尺寸链自动生成的搜索过程。

After the optimal design, some parameters of the impeller such as entrance angle and diameter and have been changed. The improved impellers efficiency and cavitation performance are better than the former one.

通过对叶轮入口处的流场分析，证实了该泵性能下降是由汽蚀造成的推测；基于速度系数法建立了叶轮优化的数学模型，通过得到的流场数据和该数学模型对原叶轮进行了优化设计，优化结果对叶片的入口角和叶片的入口直径等参数进行了改进，优化后的叶轮达到了提高泵的汽蚀性能和效率的目的。

To avoid the inconvenience of collecting blood sample and the big error with the scatter-dot graph method, this paper tries to apply mathematics model to the athletics realm, examinate the mathematics model with the data from the experiment and further analyze T's dynamic regularity in sanda rivalry.

为了避免血睾酮采血的不方便性和传统描点法误差大的缺陷，本课题尝试将数学模型的研究方法引入到体育领域中，并用实验所测数据对该数学模型进行检验。

Based on synthetic evaluation model in fussy mathematics and cubic exponential smoothing method of time series, the evaluation and forecasting models are established.

3对常用旅游评价、预测的数学模型进行总结、分析后，采用基于模糊数学方法的模糊综合评价法、基于时间序列分析方法的三次指数平滑法建立本系统的评价及预测模型。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。