系统

This paper puts forward that a distributed control system can be used to monitor and control vessel gate within a real-time or remote distance,the basic project,structure,applications and functions of computerized SCADA system in hydraulic system of vessel gate is introduced.A double layer network structure,Epigynous and hypogynous machine network,is applied to this system.In accord with the application of technique such as PLC,integrated software etc,this paper introduces the methods and application to achieve the computerized SCADA system in the task,and analyzes the characteristic of this system.

另外，本文提出了建立船闸控制系统的分布式控制系统，介绍了船闸液压控制系统的计算机监控系统的方案、结构、应用和主要功能，采用双层网络化结构：上位机网络和下位机网络，并结合PLC通信网络技术和组态软件等技术构成的计算机监控系统的实现方法，实际应用，分析了这种较新的系统模式在船闸液压控制系统的计算机监控系统的功能实现中所具有的特点。

matlab sps is used to build a simulink model of single-machine infinite-bus system, and based on the simulink model, simulation on effect of pss suppressing small disturbances low frequency oscillation is carried on, and some methods of improving power system transient stability are simulated, including avr and pss, short circuit cleared rapidly, fault current limiter and single-phase auto reclose. the study unifies the simulink model to realize matlab and vb seamless integration using the activex technology, and demonstrated the matlab simulation result with the vb contact surface. this method of matlab and vb integration can make up the matlab contact surface unfriendly flaw and offers a reference for the design for cai of power system analysis course.

运用matlab电力系统仿真模块集sps构建了单机—无穷大系统simulink模型，对电力系统稳定器抑制电力系统小扰动低频振荡的效果进行了仿真；对提高电力系统大扰动功角稳定性的措施，如自动电压调节器及电力系统稳定器、快速切除故障、故障限流器、自动重合闸等手段的使用效果进行了仿真验证；并结合单机—无穷大系统的simulink模型运用activex 技术实现sps与vb的无缝集成，将sps的仿真结果用vb界面显示，较好地弥补了matlab用户界面不友善的缺陷，为《电力系统分析》课程进行cai设计提供了思路。

At first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu-lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band-pass filter, alternating amplifier, phase sensitive demodulatorn, pulse-width modulation, frequency scale circuit, moment current generator. Finally, using the graphics program language LabV-IEW which is designed for testing field especially by NI accomplishes the solfware design of testing system,realized the testing functions.

首先对加速度计及其测试技术的发展历史和现状，液浮摆式加速度计的工作原理和数学模型等作了简要的介绍，然后确定了以二元调宽脉冲再平衡测试回路为设计方案，并从控制理论的角度进行了分析，着重研究了系统中各部分的传递函数，利用系统开环传递函数分析了系统的稳定性，同时设计了系统的校正网络；分析了二元调宽脉冲再平衡测试回路的分辨率、采样约束以及测试精度等基本问题，并按照系统分析的结果设计了包括前置放大、带通滤波、交流放大、相敏解调、脉宽调制、频标电路以及力矩电流发生器等测试系统各部分硬件电路，验证了电路的正确性，最后按照测试系统的要求，采用了美国NI公司专为测试领域所开发的虚拟仪器工具——LabVIEW作为测试软件开发工具，利用该图形化编程语言完成了测试系统软件部分的设计，实现了测试功能。

On the ecosystem health, definitions from utilization and ecosystem views are introduced, the contents and difficulties in assessing it are discussed. On the biodiversity enhancement, the relationship between forest structural complexity and forest biodiversity are discussed, the significance of old growth structure are highlighted, and measures of changing forest structure to promote forest biodiversity are put forward. On the landscape planning in forest management, some patterns, theoretical foundations and models are introduced, especially three conceptual models, i.e., key habitat\|corridors model, nature landscape model, and supportive features model. On the alternative silvicultural systems, reasons for developing alternative silvicultural system by mimic of nature disturbance are discussed, and some advanced techniques and their ecological basis are noted. Finally, on the ecosystem service, its contents and importance of assessment are illustrated.

关于森林生态系统健康，讨论了不同角度对生态系统健康的定义和不同层次上的生态系统健康的内容及评价生态系统健康的困难所在；②关于森林生物多样性，探讨了森林结构复杂性与生物多样性的关系，老龄林结构对森林生态系统的意义和作用，以及如何通过经营调整结构促进生物多样性；③关于森林经营的景观规划，描述了进行景观规划的途径、理论和模型，并对三种概念模型进行了介绍；④关于森林经营的替代技术体系，介绍了模拟自然干扰设计替代技术体系的原理，分析了替代经营技术体系产生的原因和有关最新技术研究进展；⑤关于森林生态系统服务，讨论了生态系统服务的基本内容和评价在森林生态系统管理中的重要意义。

Research content and research object. The Coagulant Dosage Automatic Control System is discussed emphatically. Including the relation is put up between target standard and the infection factor by date analyzed chart and educational established and sum up the best working point. The target standard including SS COD and OIL .The infection factor including the dosage of PAC PH Mill INTENSION and TIME. On the basis of craft character and control request, it makes a selection of scheme to the whole control system. Finally a scheme is chosen and described as follows: CPU222 of SIEMENS PLC S7-200 is used as the control kernel. V606IC TOUCHER is used as communication man and machine. Controlling pump, compressor, metric pump of system by gathering andanalyzing the flow, PH of raw water .

重点探讨系统的投药自动化，包括系统的数学模型建立的过程，通过数据分析，采用图表和方程式建立系统排放指标(SS、CODcr、含油量)，与各种因素(PAC用量、PH值、搅拌强度、时间)的关系，确定系统的最佳工作点；根据系统工艺特点以及控制要求，对控制系统设计方案进行了选择，确定以西门子PLC(S7-200 CPU222)为控制核心，V606IC10触摸屏作人机界面，通过对原水流量和PH计采样、分析，实现系统中的泵、风机、计量泵等控制；文中从功能上简要地介绍监控系统和给出了自动化原理构成图、PLC软件流程图及部分主要程序。

First of all,it discussis develop background and synopsis of this system;then,it discussis three technologies of developing thods,namely,it involves in tway of SDLC,the way of Prorotype,the way of OO,and the way of th system;it elaborately expound technologies and appviation of Systems Analysis and System Design,especialy the commu between ement and Students by meas of C/S(Client/Server);it also discussis the question and the knowledge during develop this system;during develop this system, I understand the thinking and method of develop MIS.

全文共分为绪论、开发方法的选择、系统分析、系统设计、系统实施、结束语等六章。首先论述了该系统的开发背景和系统的简单介绍；然后，讨论了结构化生命周期法、原型法和面向对象这三种开发方法的技术，根据需要选择合适的开发方法；结合本系统详细阐述了系统分析、系统设计的技术及应用，尤其在机房管理人员和上机人员的交流方面采用了C/S结构进行解决；此文还论述了在开发过程中遇到的问题及学到的东西。

For finite number of frequency bins, the maximum throughput of synchronous system is about twofold to that of asynchronous system. It can be seen that the synchronous FH—CDMA system is related to slotted ALOHA system, and the asynchronous system is related to unslotted ALOHA system.

此外，还对ALOHA系统与FH—CDMA系统作了比较，得出：当要求分组错误概率较小时，FH—CDMA系统的吞吐量比ALOHA系统大得多；窄带系统中的时槽与FH—CDMA系统中的同步跳频相对应，而窄带系统中的非时槽则与FH—CDMA系统中的异步跳频相对应。

On the basis of research, it ascertains the whole functions, the structure of network and the framework of structure.

本论文以2004年绍兴市国税系统信息化重点项目——国税远程教育系统的研究与应用为背景，结合我国国税系统专业领域远程教育的现状及需求，研究了面向国税系统远程教育的特点，提出了国税远程教育系统的解决方案；研究了系统的对象和业务模型，确定了系统的总体功能、网络结构和系统架构。

This text regards development of the personnel management subsystem in the management information system construction of enterprises as the background,Have described the concept of the management information system,Basic principle and method of structure and system development, The full text is divided for the preamble altogether, the management information system survey , development approach, developing platform , tool and system plan and analyse , realize , operate and maintain , appraise systematically systematically systematically, procedure debug with trouble dealing with , developing 9 chaptering of summarizing etc.

本文以企业管理信息系统建设中的员工管理子系统的开发为背景，论述了管理信息系统的概念、结构及系统开发的基本原理和方法，全文共分为序言、管理信息系统综述、开发方法、开发平台和工具、系统规划和分析、系统实现、系统运行及维护、系统评价、程序调试与故障处理、开发总结等九章。

This text regards development of the personnel management subsystem in the management information system construction of enterprises as the background,Have described the concept of the management information system,Basic principle and method of structure and system development, The full text is divided for the preamble altogether, the management information system survey , development approach, developing platform , tool and system plan and analyse , realize , operate and maintain , appraise systematically systematically systematically, procedure debug with trouble dealing with , developing 9 chaptering of summarizing etc.

本文以企业管理信息系统建设中的考勤管理子系统的开发为背景，论述了管理信息系统的概念、结构及系统开发的基本原理和方法，全文共分为序言、管理信息系统综述、开发方法、开发平台和工具、系统规划和分析、系统实现、系统运行及维护、系统评价、程序调试与故障处理、开发总结等九章。

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