系统的

System bandwidth is one of the most important judging criteria for the performances of the electrohydraulic position servo system.

电液位置伺服系统中，频带宽度是反映系统性能的主要评定依据之一。提高系统的频带宽度，可以加快系统的响应速度和提高动态跟随精度。

The main research work of this paper are focused on following areas:(1) Based on review of the theory and methods on measurements of particle fields, a new idea for obtaining particle size and velocity distribution within a spray through imaging the particle field with a laser light sheet was put forward;(2) A DPIV (Digital Particle Image Velocimetry) system, is fit for velocity measurements of low speed flows, was developed and expended to particle size distribution measurement;(3) An arithmetic for particle velocity field reconstruction was developed, and the velocity distribution of water mist was also obtained;(4) A software system for particle analysis, which based on image geometry emend, de-noise and image partition was developed, the parameters such as particle size distribution, mean diameter, number of particles, minimum and maximum diameter can be got with this system;(5) A water mist system was developed and its characteristics, such as droplet velocity, size distribution, number of droplets and spray cone angle under different conditions were obtained from experiments with PIVS;(6) The measurement results of water mist characteristics with PIVS were compared and analyzed with the simply simulated results, and in addition, in order to verify the accuracy of PIVS, some experiments were conducted with the standard particles, such as glass-ball with known mean diameter of 50μm and 115μm, metallic coated tracing particle with mean diameter of 12μm;(7) Some experimental studies on interaction of water mist with liquid pool fires were conducted.

本论文的主要工作包括以下几个方面：（1）在对粒子场测量的相关理论和具体方法进行综述分析的基础上，提出了通过采用激光片光对粒子场进行成像以获取其粒径和速度等参数分布的新思路；（2）研制了适宜于低速流动速度场测量的DPIV(Digital Particle Image Velocimetry)系统，并使其实现了对粒子场粒径分布的测量功能；（3）研制了基于粒子运动轨迹的速度场重建算法，获取了细水雾雾场的速度分布；（4）研制了基于几何校正、去噪、图象分割等图象处理方法的"粒度分析软件系统"，该系统既可分析给出粒子场的粒径分布直方图和平均粒径，还可给出粒子的数目以及最大、最小粒径等信息；（5）建立了一细水雾发生系统，并应用上述方法对不同压力条件下细水雾系统的雾场特性（如速度分布、雾滴粒径分布、雾滴的数目、喷雾张角以及雾化长度等）进行了实验测量研究；（6）对细水雾特性参数的PIVS测量结果与计算机简单模拟计算结果进行了定性比较分析，并利用平均粒径为50μm和115μm的玻璃球以及12μm的标准示踪粒子对PIVS系统的粒径和速度测量结果进行了实验验证，同时对其局限性进行了分析讨论；（7）对不同工况条件下细水雾与油池火相互作用的过程进行了模拟实验研究。

At present, there are two branches in the research of database security technology, which are secure database management system and enhancive database security system. According to the view of enhancive database security system, this paper takes the typical TCSEC model as reference. An agent system is built between database client and database server for secure communication, SQL parsing and access controlling.

目前，我国数据库安全技术研究主要有安全数据库管理系统和数据库安全增强系统两个方向，本文主要从数据库安全增强系统的角度出发，参考经典的TCSEC监视器模型，在数据库客户端和服务器端之间建立一个代理系统，来完成数据库的安全通信、SQL分析和访问控制等功能。

This system is a distributed and distant communication system with PC as epigyny computer and 8098 SCM as hypogyny computers. The authors deeply research hardware structure and soft design of this system and draw up a plan for this system.

该系统是由PC机为上位机、6台8098单片机为下位机的远距离分布式通信系统，作者对系统硬件结构和软件设计进行了深入的研究，提出了系统的实现方案。

The latter seems to be more reasonable in designing in terms of evenness values.

在两种分类系统中也存在一些细小的差别，垫刃亚目分类体系较中国土壤系统分类具有更丰富的分支体系，而从均匀度指数来看，中国土壤系统分类系统的设计似乎是更加合理。

Band on analysis of the river system and its formation, some characteristics of the river system are expounded herein such as fluidness, green ecology, resources, hydraulic, adjustability, human culture, integrity and so on. Functions of the river system is given such as natural function, service function, humanities and landscape function and disaster characteristics.

通过分析河流系统的概念和考虑河流系统组成特点，详细地论述了河流系统的流动性、绿色生态、资源性、水能、可调控性、人文性、完整统一性等；系统地提出了河流功能的具体内容，包括自然功能、服务功能、人文景观功能和灾害性能。

The fundamental theory of forced power oscillation in power system is explained by a single-machine infinite-bus power system model.

以单机无穷大系统模型为基础，阐述了电力系统强迫功率振荡的基础理论，分析了影响电力系统强迫功率振荡的主要因素，并对单机无穷大系统的强迫功率振荡进行了仿真验证。

By analyzing the forced vibration and damping characteristics of the system, a least logarithm decrement is proposed, which can be used as the capability criterion, when the critical speed is stridden over.

研究发现，不同的系统参数对系统的动力特性有不同的影响，同一参数对不同系统的动力特性的影响规律也是不同的；在该系统中，总有一个稳定性薄弱环节影响系统的稳定性。

The logic structure and main components of RCC are described and some key technologies are discussed, such as, the separation of compiler's fore-end and back-end, interface definition between the fore-end and back-end, the definition of instruction system of the virtual machine.

论文首先介绍了RCC编译系统的结构和组成部分，研究了可重定向编译系统中涉及到的几个关键技术：编译系统前后端的划分、虚拟机指令系统定义、前后端接口描述、指令映射和选择树语法及树分析算法。

Beginning with the requirement of currently OA, we expound the Official Document Circulation the technique development of the system with the project -- that the need development, morrow will adopt to system operate system, database the choice of the system and development tool, proceeds argument, further detailed description total need of system is with key technique towards each function mold piece rule for proceeding for of analysis designing, lay emphasising Dispatch mold piece, Furl mold piece , then in a specific way relating the database designing and this system at design realize inside use and calculate way, finally talked the oneselfed at this a development process realizing of inside and insight.

本文以当前对自动化办公的需求开局，阐述了公文流转的概念以及公文流转系统的技术动态和需求动态，提出了系统开发的目标，紧接着对系统将要采用的方案--操作系统、数据库系统及开发工具的选择，进行了论证，进一步详细叙述了系统总体需求和对各个功能模块的分析设计，侧重的进行了发文模块、收文模块概述，然后具体讲述了数据库设计的规则以及本系统在设计实现中所用到的关键技术与算法，最后谈了自己在这一开发过程中的体会与心得。公文流转，发文，收文， C/S 模式

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。