技术

Mechanical Drawing is the important tool for engineer to express and exchange their device. It is a language of engineering and a magnitude technique document.

工程图样是工程技术人员表达和交流技术思想的重要工具，是工程界的&语言&，是工程技术部门的一项重要技术文件。

And the technology of Java Applet and Web database is introduced in detail. The particular design of the reuse-water remote monitoring and control system is purposed. The concrete hardware structure and software unitary design suppose is put forward, and achieving the tight joint between monitoring and control technology and network technology, the serial programming is used to the data collection in the system.

论文详细设计了中水回用远程监控系统，提出了基于Web的中水回用远程监控系统的具体硬件结构方案和软件的整体设计思路，实现了监控技术与网络技术的紧密结合，应用串行通信技术进行数据采集，使用Java Applet和Socket通信技术解决远程实时通信问题。

The article presents the developing condition of PWM and SVPWM first.Then the theory of SVPWM is discussed in detail.The SVPWM is based on the thought of magnetic chain tracking.It makes the ideal magnetic chain circle of three-phased sysmmetry electric motor supplied by three-phased sysmmetry sine wave voltage for basis,uses the practical magnetic chain vector formed by the different switch modes of three-phased inverter to track the basic magnetic chain circle.During the course of tracking,the inverter changes the switch modes properly to form the PWM waves.Then the modulation wave of SVPWM is analyzed in detail.The modulation wave of SVPWM is implicit,but the analogous modulation wave in A-B-C axis needs to be calculated in order to expose the internal relation of SVPWM and SPWM.That is to show the implicit modulation wave of SVPWM. SVPWM actually is a transformed SPWM ruly sampled by the modulation wave which is injected by the zero prefaces based on space vectors.

本文首先对脉宽调制技术的发展现状进行了综述，在此基础上分析了电压空间矢量脉宽调制技术的发展现状；接着对空间电压矢量脉宽调制技术的基本原理进行了详细的分析和推导，SVPWM是基于磁链追踪的思想，它以三相对称正弦波电压供电下三相对称电动机定子理想磁链圆为基准，由三相逆变器不同开关模式下所形成的实际磁链矢量来追踪基准磁链圆的，在追踪的过程中，逆变器的开关模式作适当的切换，从而形成PWM波；然后详细分析了电压空间矢量脉宽调制技术的调制波，虽然SVPWM法的调制波是隐含的，但是为了揭示SVPWM法与SPWM法的内在联系，需要求出SVPWM在A-B-C坐标系上的等效调制波，也就是将SVPWM的隐含调制波显化；SVPWM实质是一种基于空间矢量在三相正弦波中注入了零序分量的调制波进行规则采样的一种变形SPWM。

To deal with the problems and present situation of field data capture by computer in geological mapping in 20 years, this paper has created PRB digital mapping techniques to standardize the digital mapping process and discussed PRB mapping technique-method system, including PRB digital mapping techniques, the model of PRB data and the related process, combinational regulations of PRB process, common mechanism and basic procedure of PRB process, data processing and dictionary of PRB, three-class PRB system,...

从近 2 0年地质填图中计算机野外数据采集技术研究的现状和存在的问题入手，在确定地质填图空间数据表达的基础上，遵循传统地质填图的规律，在不约束地质学家地质思维的前提下，既能满足计算机处理的需要，又能保证地质工作者取全、取准各项地质观测数据，在描述各类地质信息空间关系的基础上，创建了数字地质填图过程标准化和规范化的PRB数字填图技术，并对构成PRB数字填图技术、PRB数据模型、PRB基本过程、PRB基本过程组合的规则、PRB过程的公共机制、PRB过程基本程式、PRB数据操作、PRB字典、三级PRB体系、PRB数据流&栈&、PRB数据质量定量评价体系的PRB数字填图技术与方法体系进行了讨论。

On December 26, 2005, computational center is in Beijing north software of active to small drop defence undertook series is attacked after defending a test, give height the opinion: By Beijing east small drop finite liability company offers IT ' small drop is active defence software ', with defence to identifying sealed virus has better effect, initiated the new thinking of active defence virus, it is the major breakthrough that turns over virus core technology and innovation.

微点主动防御技术已经得到了国家和有关权威部门的高度关注和支持，2007年12月29日，微点主动防御技术被列为国家&863&科技攻关项目。2005年12月26日，北京北方计算中心在对微点主动防御软件进行了系列攻防测试后，给予高度评价：由北京东方微点信息技术有限责任公司提供的'微点主动防御软件'，对识别和防御未知病毒具有较好的效果，开创了主动防御病毒的新思路，是反病毒核心技术的重大突破和创新。

At first, in this paper the background and basic principle of VoIP are introduced; the much popular VoIP technology based on H.323 protocol is studied; based on the function and main working process of IP telephone system, the principle of coding of compression and transfer technology of the real-time voice are analyzed; depended on the existed experimental environment, the program of voice part of PC to PC video telephone terminal based on LAN is designed and implemented; and the problems encountered during the design of program have been analyzed and solved.

本文首先介绍了IP电话的发展简史，IP电话技术原理；对目前最为流行的基于H.323协议的VoIP技术进行了研究；根据IP电话系统的功能和主要实现过程，分析实时语音压缩编码技术和传输技术原理；利用实验室现有的实验环境，设计并基本完成了一种基于局域网的PC to PC可视电话语音部分的编程；并对程序设计过程中所遇到的问题进行了分析和解决。

Using target sequential frame AND silhouette technique finished the real-time target tracking system.

提出了动差轮廓自适应目标提取技术、多目标提取技术和点目标提取技术，并采用动差形心法动目标跟踪技术研制了实时动目标跟踪系统。

It is advanced farming technology which through the implementation of reduced tillage, no-tillage technology, using crop stalks stubble ground cover to reduce soil water erosion, wind erosion, so as to enhance the capacity of soil fertility and drought-resistance .Function and role of conservation tillage technology have been proved by practice.

保护性耕作技术是相对于传统耕作的一种新型耕作技术，起源于19世纪末的美国，通过对农田实行少耕、免耕技术，尽可能用农作物秸秆、残茬覆盖地表，以减少土壤水蚀、风蚀，从而提高土壤肥力和抗旱能力的先进耕作技术。

In this paper,the software design and the implementation scheme of the video stream capture and real-time displaying system of CMOS digital image sensor based on USB2.0 interface and DirectShow technology was put forward,and the architecture of DirectShow software was also given.

徐大诚，教授，主研领域：信息获取与处理技术，光电信号处理技术给出了一个基于USB2.0和DirectShow技术的CMOS数字图像传感器视频流捕捉及显示系统的软件设计与实现方案，阐述了DirectShow的技术结构。

The paper introduces the latest development and application in the production of engineering survey technology. GPS allocation technology and the combination of GPS and total station have been widely used in plane surveying of control survey. Electron distance trigonometric leveling can replace third and fourth-order spirit leveling in vertical survey. Data collection, processing and drawing by total station has achieved automation and integration in topographic survey, etc.

随着工程测量技术的发展，控制测量中平面测量已广泛地采用了GPS定位技术、GPS与全站仪相结合的技术，高程测量中电子测距三角高程能代替三、四等几何水准测量；地形图测绘中，实现了全站仪从野外数据采集、处理到绘图过程的自动化和一体化；摄影测量和高分辨率遥感技术在大比例尺地形测图中的应用等。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷