工作分析

In this paper, the basic principle and the power factor of conventional SERDS are discussed. Aiming at its shortage of low power factor, boost chopper type SERDS is adopted. The equivalent circuit of the new scheme is built up, and then vector diagram is used to analyze the power factor of the system, also the harmonic distortion of the system is discussed. The experiment device is established base on a 380F/7.5 kW induction motor and a passive soft switching scheme is applied in order to improve the working condition of IGBT. At last, the experimental results are shown.

本文在分析传统串级调速原理的基础上，对系统的功率因数进行分析；针对传统串级调速系统功率因数低的缺点，采用升压斩波式串级调速系统加以改进；建立了升压斩波式串级调速系统的等效电路并采用向量图法对该系统的功率因数进行详细分析；分析了系统的谐波情况；构建了以7.5kW／380V电机为调速对象的升压斩波式串级调速系统实验装置，给出相应的实验结果；针对斩波器中IGBT处于硬开关状态的缺点，应用无源无损软开关技术予以改善，包括对软开关电路工作原理的分析、参数的设计并给出相应的实验结果。

The phylogeny and applied prospect of MES are summarized in the paper. The principle of this system is analyzed from the point of view of acoustics. The surveying and filtering technology of auxiliary parameters, sounding data and the theory of image form, backscatter strength data processing, are researched deeply in the paper. The optimal model of velocity of sound is given. For sound ray tracing, some methods of correction of sound ray curve are developed. At the same time, an ideal model of sound ray tracing is proved and given. The GPS technology is applied for the determination of tide, attitude of vessel. Moreover, some methods are given. As an important topic, the systematic error is discussed in the paper. Some filtering methods are researched in this paper. Based on the current methods of image processing, the procedure and methods are tested and given that adapt to sonar image processing.

本文研究的工作是在总结多波束声纳测深系统的发展历史、应用前景的基础上，从声学角度分析了多波束系统的工作原理；对多波束辅助参数的测定和滤波方法、测深数据的滤波方法、多波束声纳图像的形成机理、图像处理以及最终应用等作了比较深入的研究；得出了适合于多波束精密深度计算的最优声速模型和声线改正模型；提出了 GPS 载波相位定位技术用于多波束辅助参数测量的思想、算法，改善了多波束系统的作业模式；系统地分析了深度数据的误差来源和类型，首次将系统误差作为影响测深精度的主要因素给以研究，并给出了削弱系统误差的方法，提高了深度数据的质量；对多波束声纳图像的形成、处理方法进行了细致的研究，给出了适合多波束图像处理的算法和流程，并从理论和实践上对声纳图像的应用进行了比较全面的研究。

Our project is based on Cenozoic volcanic rocks and deep seated xenoliths in it to reconstruct the source composition and ctructure. We did field investigation, collection of samples, determination of age and composition characteristics of selected samples. The new achievements are following. 1 recognized a potassic metasomatic source of the Cenozoic volcanic rocks through an integrated research of volcanic rocks and their sources. 2 analysis of TM images suggests the Tuoyun basin is a basin with a volcano group instead of a simple volcano-tectonic basin. We found several volcanic craters and cone, and detected three such craters. 3 systematic reseach of volcanic sections and collection of samples both of volcanic rocks and xenoliths, the later includes peridotite, granulite, gneiss and variety of megacrysts. This is propitious to our further research at this rigion. We would like to point that we collected some peridotite large than 20cm in diameter. It could used to variety of analysis and end the history without mantle chemistry records in the region. 4 we got a U-Pb SHRIMP age of 3.87 Ma for the Kangxiwa basalt.It is the youngest record of U-Pb SHRIMP age in China and provide a chronology restriction for last uplifting of Tibet plateau. 5 the investigation of alkali syenite-synogranite in Taxkogan suggests that the origin of Parmir syntex is related to the Cenozoic magmatism.

本项目立足于从火山岩属性和深源捕掳体反演源区成分与结构两个途径，利用火山岩综合研究成果对地幔源区进行了初步反演，提出源区经受过强烈钾质交代的观点；对重点工作区TM图像进行了初步解译，新发现若干了火山口，并对其中三个火山口作了实地查验，为进一步全面深入开展该区的火山地质学及相关科学问题打下了良好基础，认为托云盆地是一个火山群，而不是一个单一的火山构造盆地；系统测制了火山岩剖面，新采集了一批重要的火山岩和深源岩石捕虏体样品，为下一步工作打下基础，特别是采集到了直径打20cm的幔源橄榄岩包体，可用于各种测试，将可以结束西部造山带没有地幔岩化学分析结果的历史；对康西瓦玄武岩进行了测年分析，取得了我国目前最年轻的锆石U-Pb SHRIMP年龄，对青藏高原挽近地质时期的隆升提供了年代学约束；对帕米尔东缘塔什库尔干碱性岩体的动力学意义进行了探讨，提出青藏高原西部构造结的形成与岩浆活动有关的观点。

At first, the DC and AC characteristics of the HBT were studied theoretically. Then a voltage comparator was designed.

首先，分析了HBT的基本工作原理；然后比较详细地分析了ECL电压比较器的工作原理并进行了设计。

Motibity changed by gear-box in direction and rotate speed is transferred to the blade axis on the right side to drive the blade axis. blade axis'parameter, blade assembling frame and blade assembling means are ascertained. The load and movement of the blade axis are analyzed. And the best blade rotate speed is ascertained. According to the request of no-tillage soil, the appropriate furrow openers are chosen. They are staggered and assembled in two rows .According to the sliding cutting request, the crucial parts of the anti-blocking——the sliding cutting blade, its edge curve is analyzed and designed in principle. The academic curve function is gotten. Combined with working practice and technics request, the blade's figuration parameter is designed, 65Mn is chosen as the material for blades. The working load is analyzed. And the intension of the sliding cutting is analyzed and checked with ANSYS software. At last, the spring rack of the suppress wheal is analyzed in principle. The theory and parameter of designing the spring rack of the suppress wheal. Experiment indicated that the anti-blocking capability of this anti-blocking equipment was excellent.

设计出适合此防堵装置的动力传输方案，动力经变速箱变向变速后从右侧传给刀轴，驱使刀片切割秸秆；确定出了刀轴的参数、刀片的安装结构和安装方法，对刀轴的受力和运动进行了分析，确定出了刀轴最佳转速；根据免耕地的要求，选择恰当的开沟器，并采用双排错位安装的办法，避免了"瓶颈"现象的发生；根据滑切的要求对此防堵装置的关键部件——滑切刀片的刃口曲线进行了理论分析和设计，得到了刀刃的理论曲线方程；结合生产实践及工艺要求，设计出刀片的外形参数，选择65Mn作为刀片的材料；分析和计算了刀片在工作中承受的载荷，运用ANSYS 软件对滑切刀片的强度进行了分析校核；最后对镇压轮的弹簧支架结构进行了理论分析，提出了设计镇压轮弹簧支架的理论和参数依据。

When analyzing its working condition, we should sufficiently consider if the IV system is in linear amplificatory area or in saturated area.

文章摘要：在电子技术教学中，分析运算放大器系统时，应根据运算放大器系统的反馈情况，判断它的工作状态；分析工作状态时，要充分考虑运放系统是处于线性区还是饱和区。

objective:through analyzing the result of physical fitness test of children aged 3～6 years old in fengtai district of beijing,there is a scientific guiding to the next working in the future and an enhancement of physical exercise.methods:according to "the test standard of physical fitness for children aged 3～6 years old",we had the physical fitness test on 9 784 children aged 3～6 years old.the result of test was analyzed by statistics analysis.results:it is eucrasia for physical fitness of children.the percengts of excellent grade,good grade,passing grade and not passing grade are 59.12%,23.69%,13.31%,3.88%,the total percent of excellent grade is in creasing with the increasing of the age of children.there is some imbalance in test of subitem.conclusion:physical fitness test of children can guide to child care scientifically.physical exercise is very important to growth and development of children,we should pay much attention to it.

目的：分析北京市丰台区托幼园所3～6岁儿童体质测试结果，为儿童保健工作作科学指导，促进儿童体格锻炼。方法：应用《北京市3～6岁儿童体质测试标准》对我区9 784名3～6岁儿童进行体质测试，将结果进行统计学分析。结果：丰台区3～6岁儿童体质健康状况良好，综合评价优秀级占59.12％，良好级占23.69％，及格级占13.31％，不及格级占3.88％。总体评级优秀率随年龄增大而增高，小年龄组不及格者明显多于大年龄组。我区儿童各单项测试项目发展存在不平衡。结论：进行体质测试可对儿童保健工作起科学指导作用，体格锻炼对儿童生长发育极为重要。

On the basis of analyzing and evaluating civil product industry status quo,using fezzy set, the paper analyzes and determinds that RYR Institute shold take high-tech product ,self-control technology ,detecting technology electronic device for automobile ,as well as military initiating technology as prop industry of its civil product competition in order to provide plunge point for the development of its civil product industry .Then ,it analyzes the key competitive force of the civil product corperation of the institute ,set up C2R and C2GS2 models used in technical progress DEA analysis ,fmds the relation between scale benefit .and production administration .Through the analyzing of competitive core force ,it indicates that the cause resulting in low benefit of military enterprises is stagnancy of human resource exploitation .The key for the realization of advance by leaps and bounds of civil product work of RYR Institute is personnel excitation mechanism.

论文在对民品产业现状分析与评价的基础上，应用模糊聚类法分析并确定了以高技术产品、自控技术、探测技术、汽车电器及军工传爆技术作为RYR所民品竞争的支柱产业，为RYR所民品产业的发展提供切入点，在此基础上分析了RYR所民品公司的核心竞争力，建立了技术进步DEA分析的C~2R模型和C~2GS~2模型，找出了RYR所规模效益与生产组织管理方面的关系，通过对核心竞争力的分析，挑明了军工企业效益低下的主要原因是人力资源开发滞后，要实现RYR所民品工作的突飞猛进，建立有效的人才激励机制是关键。

In order to study theoretically the effects of complicated factors on traffic flow, by considering the drivers'sensitivity and prediction of forthcoming traffic situations, the deterministic deceleration step and the randomization one in the rules of the NaSch model are interchanged, which results in the sdNaSch model.

本文的工作旨在综合分析各种现有的交通流模型的基础上，提出更为符合实际的模型，并通过理论分析和数值模拟，探索交通系统中的各种非线性现象，特别侧重于交通流临界相变行为的研究，全文的工作由五部分组成

Firstly it makes the system analysis of system need , overall plan, system key and technology and so on in this paper. Then using the idea of OOP(Object-Oriented Programming), using the Combination of structural analysis and Prototypal method, and using Microsoft Visual.

本文在对大气环境质量评价工作中系统需求、总体方案、数据、系统关键技术等主要工作进行系统分析的基础上，利用面向对象的设计思想，将结构化分析和原型法相结合，以Microsoft Visual。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。