大功率的

This project is to analyze the distribution of the light in the high-power laser system, it bases on principles of ray optical, use the paraxial ray trace and real ray trace , proposes a new data structure and way to simulate the light in the optical system in the computer.

本课题就是以含衍射元件的大功率激光装置中由于多次残余反射形成的鬼像为研究对象，从光线光学的基本原理出发，应用近轴光线与空间光线追迹相结合的技术路线，提出一种新型的分析方法和数据结构，开发出用于含衍射元件的高功率激光系统杂散光分析的软件。

Making use of field matching method,combining with the variational method,the dispersion equation of the ridge loaded ring plane slow wave structure and small signal gain of this type of TWT are presented in this paper.

脊加载环板行波管是一种频带相对较宽的大功率行波管，本文用场匹配和变分原理相结合的方法，研究了脊加载环板慢波结构的导波特性及这种行波管的小信号、大信号特性，讨论了结构的几何尺寸及电子注参量对慢波的传播特性、小信号增益及注波互作用非线性效应的影响。

Aiming at a class of complex electromechanical systems, such as 4-high or multi-high cold mills and continual mills, we firstly construct mathematical models of every subsystems by means of structural principle modeling method; nextly, get the overall mathematical model of electromechanical drive system by joining together these subsystems'models according to coupling variables and parameters; we finally simplify the overall model according to time-scale principle which can retain main eigenvalues and significant state variables, and obtain a practical mathematical model of complex electromechanical system. By simulating the CM04 temper mill's model constructed by above-mentioned method, we test and verify that the modeling method is effective and practical. The study analyzes and researches the electromechanical coupling facts and acting laws existing in complex electromechanical system.

提出了系统的总体测试方案，设计了高保真度的信号隔离和缓冲器，解决了从大功率、大电流复杂机电系统主回路中提取真实谐波分量、而又能不影响系统正常运行的难题；发现了谐波电流对平整机工作状态的影响规律；确认谐波电流是可能引起平整机工况奇异、产生机电耦合振动、导致带材产品表面出现明暗振纹的一个因素；提出了一种多相整流电路谐波电流的分析计算方法，用该方法对平整机三相桥式整流供电电路的谐波分量进行了理论分析和计算，计算结果与实测结果能得到相互验证，说明该方法是可行的，实测结果是可靠的。

This engine benefits from variable valve A high-performance chassis for saloon-style driving sensations timing and camshaft variator which permits two types of use: one calibration for idling or when running partially loaded at mid and high revs for maximum power, and a second calibration which permits a bigger overlap between the intake and exhaust strokes for a torque gain of between 5 and 10Nm.

从可变气门的高底盘的轿车性能风格的驾驶感觉，时间和凸轮轴变速器的许可证或空转运行时有部分中的最大功率和高转速装两种用途：1校准这台发动机的好处，和第二个校准它允许更大之间的进排气重叠杆为5至10纳米扭矩增益。

Through comprehensive applications of many key projects,such as well location optimization technology,mixed oil drilling technology combined with using popularized PDC bit s of high efficiency and high torque and low-velocity hobs of great power, deep well bore contro.

通过井位优选技术、推广高效 PDC 钻头和大功率高扭矩低速螺杆的复合钻井技术、深井井身控制技术、以防漏堵漏为主的调整井钻井技术等各项攻关课题的综合应用，形成了一系列的深井优快钻井综合技术，大打钻井科技攻坚战，取得了钻井速度的新突破。

When uses the uprated engine to output the big torque satisfies the present truck fast, the heavy load high efficiency, the high benefit need, must match one highly effective, the reliable driving axle.

当采用大功率发动机输出大的转矩以满足目前载重汽车的快速、重载的高效率、高效益的需要时，必须要搭配一个高效、可靠的驱动桥。

Direct Torque Control is a novel torque controlling technique which was proposed in 1980's. Although this technique has received a successful application in high-power ac drives recently, there are also a great deal of problems in the theories and practics which deserve to research. Centring around how to find and solve these prombles, theorical analyses, computer simulation and experimental studies are carried out in this dessertation.

直接转矩控制是八十年代提出的一种新型感应电机转矩控制技术，目前该项技术在国外电力牵引中的大功率交流传动上已获得成功的应用，然而作为一项新技术，它在理论上和实践中仍存在许多值得研究和探讨的问题，本文的研究正是围绕着这些现存问题而展开的。

Experimental results showed the full bridge resonant laser power supply reaches the index of high power and efficiency; has the advantages of small volume, light weight and high precision; can make full use of the rated value of power switch and the power supply even more reliable.

实验表明，基于CPLD的全桥谐振式激光电源能够达到大功率，高效率的技术指标；具有体积小，重量轻，精度高的特点；能更充分合理的利用功率管的定额参数，使电源工作运行更加可靠。

The beam widt h of t his equivalent basic mode is measured by including 98 % of t he beam energy , and t his is an effective way to calculate t he beam quality parameter.

对于工业用大功率固体激光器，输出激光功率较大，达数千瓦；为满足加工过程对不同功率的需要，输出功率有较大的范围，从额定功率到额定功率的 10 %；输出激光的模式为多模，光束质量随着输出功率的增加而变化。

This paper studies the space-charge effect of intense current in electrostatic accelerating tube based on 5 hypothese, including the potential distribution in and out beam, the impact on the axial potential by space charge and the transport of intense current.

对一种工业用大功率电子加速器(450kW)的加速管中的空间电荷效应作了5点假设，建立了物理模型。对模型的束内外径向电位分布、空间电荷对轴上电位的影响，以及空间电荷力对束流传输的影响等进行了理论分析，得到了束内径向电位分布。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。