数学

Based on the detailed analyzing of impact system working process, the differential eguation of the system was got, and the mathematical model of the hydraulic impact system was builted, on basis of the mathematical model, By using of dynamic simulation function of Matlab ,the author has built the simulation model of the impact system based on software Simulink and run it after inputting the parameter ,the dynamic graph curve of impact velocity and presser of oil and position of knife rest were got, and the dynamic characteristic of impact system was analyzed,the simulated results are accorded with the fact,and some rational parameters can be found.

在对冲击式采煤机液压冲击系统工作过程进行详细分析的基础上，运用微分方程建模方法，建立了液压冲击系统的数学模型即系统的动态方程，并在该数学模型的基础上，采用Matlab中的Simulink动态仿真功能，建立了基于Simulink的冲击系统仿真模型，通过给定冲击式采煤机冲击系统的相关参数，对该系统进行仿真，得到了冲击式采煤机工作过程中冲击速度和油液压力以及刀架位移的变化曲线，进而对冲击系统的动态特性进行了分析，结果与实际情况较为吻合，并由此得出某些合理的参数。

The polarization curve is not sufficient for a reliable and unique validation of a PEMFC model since different parameters can lead to an identical polarization curve. A three-step validation approach is proposed for a complete and unique validation. These three steps are:(1) validated by the global polarization curve,(2) validated by the local current density distribution curve, and (3) validated by the cathode over-potential and anode over-potential versus current density curve. The results from the comparison of four flow-fields show that the PEMFC performance of the flow-fields decreases in order by interdigitated, metal foam, pin-type and parallel.

通过PEMFC参数敏感性研究发现，PEMFC性能受多种参数的影响，这些参数可分为非敏感性参数、敏感性参数和高敏感性参数；与阳极侧参数相比，PEMFC性能对阴极侧的参数更敏感；不同参数值的组合可以得到几乎完全相同的极化曲线，因此电池的极化曲线不足以用于验证数学模型的唯一性与可靠性；为验证PEMFC数学模型的唯一性与可靠性，提出了模型验证的三步法：极化曲线验证、局部电流密度验证和阳极总过电位与阴极总过电位验证。

The point of intersection of three light-source on tested body is used as basic point, the mathematical model of line displacement is established.

并以固结在被测体上的三个激光器的交点为基点，建立其线位移数学模型；以方向余弦法来确定被测体的角位移，建立其角位移数学模型。

Its historical process was a result of the effects of the mechanised character and the supposing method of Traditional Chinse mathematics.

一道数学问题最终成数学史上的华采篇章，故探明其演变源流、梳理其算法思想，无疑具有积极的意义。

This paper mainly introduces several different methods to prove the mid-value theorem, at the same time the mid-value theorem is applied in the mathematical theory, such as the application and mathematical modeling.

本文主要推荐几种不同的方法证明微分中值定理，同时对微分中值定理加以应用，如在数学理论中和数学建模中的应用。

The paper mainly discusses the application of AHP in the mathematical modeling and the estimation and administration of milkmen, which is a kind of multiple-criterion measures combined the quality and the quantity to illustrate subjective judgment in quantitative index.

本文主要研究了AHP法在数学建模以及送奶工评价与管理研究中应用的问题。层次分析法是一种定性与定量相结合的多准则决策方法，可以将人的主观判断用数量形式表达和处理。论文首先介绍了问题的背景、数学建模的发展、层次分析法的发展与理论等，指出了研究的重要意义。

By way of introducing expression of salt solution concentration and Hendeson equation that describes equivalent moisture curve of hygroscopic material, the heat and mass transfer model is simplified and provides a theory proof that the transportation direction of water and vapor in the pore material is opposite but effects of two items can be integrated as an expression, Compared to traditional vapor permeating, the calculated results from the presented model in this paper that salt is not taken into considered is accurate.

根据建筑围护结构自身所处环境特点，开拓性建立了吸湿区范围内含盐多孔材料的热质迁移数学模型，通过引入描述平衡湿度曲线的Hendeson方程和盐溶液浓度的表达式，对含盐多孔介质热质迁移数学模型进行了简化，从理论上论证了多孔材料中液态水分和水蒸汽迁移二者过程的相反性和统一性。

The usage technique of radar for high-speed ship s to prevent collision in Three Gorges reservoir;2. Research on Modeling and Simulation of High-speed Ship CPP Propulsion System;3. Based on three typical high-speed ship (high-speed monohull ship,planning hydrofoil craft,wave-piercing Catamaran),a mathematic models of high-speed ship ′s propulsion system(common screw propeller,adjustable-pitch propeller, water-jet propeller) and intelligent control system are established the simulation with the help of Matlab/Simulink is realized.

以三种典型的高速船(高速单体船、翼滑艇和穿浪艇)为例，建立了其推进(普通螺旋桨、可调螺距螺旋桨及喷水推进)系统及智能控制的数学模型，并在Matlab/Simulink上实现仿真；建立了推进系统的优化数学模型，编制了优化算法(混沌算法、遗传算法和粒子群算法)程序，实现了智能推进系统的优化设计；最后，运用Matlab/GUIDE进行界面设计，编制了高速船智能推进系统仿真与优化软件，实现了良好的人机互动。

In the second day's lesson, I know more about how Brenda Dietrich and her math science whizzes, which is consisted of 160 members, use math to tackle a array of problems in real world.

在这第二天的课程，我了解到更多有关于Brenda Dietrich 与她数学科学优异人才（共由160人组成）如何使用数学解决一大批现实中的难题。

Mr Chen, the engineering brains of the two, followed a path trodden by other maths and sciences whizzes: the Illinois Mathematics and Science Academy, a school for gifted children that can list a number of dotcom success stories among its alumni; the University of Illinois' computer science department, where the Mosaic browser, forerunner to Netscape, was developed; PayPal, the company where a number of prominent internet engineers cut their teeth.

这二人当中，工程人才陈士骏的成长道路与其他数学和自然科学奇才如出一辙：伊利诺伊州数学和自然科学学院(Illinois Mathematics and Science Academy)，一所供高智商儿童就读的学校，在其校友中能列出一大串网络成功故事；伊利诺伊大学计算机科学系，网景的前身&Mosaic浏览器&就是在那里开发的；贝宝公司，那里是许多卓越的互联网工程师小试牛刀的地方。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。