原理

Second, the operation principle and measurement principle of optical-electronic theodolite are introduced.

介绍了光电经纬仪的工作原理与测量原理。

On the basis of the theory of protection functions, the algorithm of data processing used in the relay is introduced, and then theory and implementation of Fast Fourier Transform is discussed in detail.

本文在分析各种保护功能原理的基础上，介绍了保护和测量中采用的数据处理算法，详细论述了快速傅立叶变换的原理与实现。

The principle of the new thermocouple is based on the third law of thermoelectricity, i.

此热电偶的原理是基于热电特性的第三原理。

The principle and method that the light splitter,attenuator and thermopile are used for testing the power of laser are introduced.

阐述了利用分光器、衰减器和热电堆检测激光功率的原理和方法，该检测方法满足了系统实时参数检测和对测量精度优于5%的要求；介绍了利用隔离器抑制激光电源产生的强共模干扰对系统影响方法和系统嵌入式硬件设计的原理和系统软件功能。

The research work of this paper is divided into five parts: The first ,according to the work characteristics of ship's auxiliary boiler, this paper is to design applied project in the automatic control system of ship's auxiliary boiler; The second, according to the work request of the cargo winch of alternating three-speed change-pole speed-adjusting, this paper is to determine adopting the method of the PLC control; The third, this paper is to design PLC application in three -phase induction motor control, to give the ladder chart, program and input and output circuit diagram; The fourth, this paper is to research the method of the ship's combined starting screen automatic control with the PLC; The fifth, this paper is to inquire the possibility of apply the PLC in ship's engine room surveillance system; According to the comprehensive analysis of above actual example of ship's auxiliary machinery automatic system with the technique of PLC; not only can use the technique of PLC to replace traditional relay-contactor control technique in ship's auxiliary machinery automatic system, but also can get the conclusion of the former is more dependable and more clever than the latter, the maintenance is more convenient, thus develop a new path for ship automation.

本文研究的工作主要包括五个部分：第一，根据船舶辅锅炉的工作特点，设计PLC在船舶辅锅炉自动控制系统中的应用方案，主要有PLC选型及输入输出点的设计，画出系统控制梯形图并分析工作原理；第二，根据交流三速变极调速起货机的工作要求，确定采用PLC控制的方法，进行控制系统的硬件设计和软件设计，并分析工作原理：第三，设计了PLC在三相异步电动机控制中的应用，给出了控制梯形图、程序及输入、输出接线图；第四，研究了用PLC实现船舶组合起动屏自动控制的方法，进行了系统的电源设计和软件设计，给出系统工作流程图；第五，探讨了船舶机舱监视系统应用PLC的可行性，将继电器报警线路改为用PLC控制报警，给出系统硬件图和软件梯形图，并分析了PLC机的选型、抗干扰和应用PLC的经济效益和社会效益等问题。综合以上船舶辅助机械自动控制系统采用PLC技术的实例分析，可以得出船舶辅助机械自动控制系统不但可以使用PLC技术取代传统的继电器接触器控制技术，而且前者比后者更可靠、更小巧，维护保养更方便的结论，从而为船舶自动化开辟了一条新的路径。无忧毕业设计网 www.5ubs.cn

In the article introduced the monolithic integrated circuit to the electric motor the control, elaborated the crystal thyratron accent presses the velocity modulation the principle by and its the control system principle of work, introduced the hardware system design and the software system establishment.

文中介绍了单片机对电动机的控制，阐述了晶闸管调压调速的原理以及其控制系统的工作原理，介绍了硬件系统的设计和软件系统的编制。

The paper reviews the phylogeny of the LCD, describes the recent development situation of LCD-TV and several authority investigation institution do its prospective forcast. The research of the switching power supply, future development t rend is given in the paper. Outlines of LCD-TV technology, introduce the sort of topological structure. The BUCK type converter topological structure and the systematical basictheory were put emphasis on; the PFC, the reasons of power factor simply and the core of L6562 were analyzed, emphatically on the application circuit of this core, and account the design parameter of the application circuit. The sort and control mode of PWM, the control core of UC3846 and OB2262 were explained, the application circuit of this core were specific analyzed, practice picture in the real circuit uses oscilloscope were educed and contrastive analysis in this research.

本文回顾了LCD的发展史，介绍了LCD-TV发展的近况和一些权威调查机构对其未来的预测；对开关电源的研究概况和它的发展趋势作了总结；总体介绍了LCD-TV电源的结构及工作原理、拓扑结构的分类，着重研究了BUCK型变换器的拓扑结构及工作原理；对PFC作了综述，研究了功率因数降低的原因，重点介绍了L6562芯片，对此芯片的应用电路作了具体分析，并对芯片外围的设计参数作了分析研究；研究了PWM的分类和控制模式，对控制芯片UC3846和OB2262分别进行了重点说明，详细研究了基于UC3846的PWM设计，用示波器对其实际电路进行了抓图，并对比分析实际波形。

By taking photo of shaft by CCD camera, acquire the image signal, and then extract the torsional oscillation information from it using data processing arithmetic.

为分析方法的可行性，进行了原理实验，本文对原理实验的装置、内容及结果进行了详细的介绍。

The three aspects of Marxian Dialectics, namely, the concept of dialectic negation, the unity of advancement and tortuousness, as well as the principle of unity of universality and peculiarity in "negation of negation", provide a Marxist theoretical guide and methodological foundation for further emancipation of our mind in the new era.

马克思主义辩证法关于辩证的否定观、事物发展前进性与曲折性相统一原理以及否定之否定的普遍性和特殊性统一原理三个方面，为新时期解放思想提供了马克思主义理论指导和方法论基础。

This model based on the idea of Heisenberg's Uncertainty Principle, which states that we do not know the precise location or the velocity of any given electron.

这个模型基于海森堡的测不准原理，测不准原理声明我们不知道任何已知的电子的精确位置或速度。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。