电路板

Based on the design of measurement circuit and environmental quality of practical situation, the vibration proof and airproof experiment have been carried out separately.

密封实验表明电路板具有很好的耐油污性能，抗振实验表明电路板具有很好的抗振性能，设计的电路板可以在线使用。

A bristle or seta, especially of an annelid worm.A circuit board, especially for use in a microcomputer.

卡片，界面卡，插件一种电路板，尤指用于微型计算机里的电路板

PWB Type Designation 电路板产品型号: Please fill the type designation in the blank, and note that please don'use ANSI grade or flame rating as t the PWB Designation.

请填写贵公司要申请的印刷线路板的型号，建议不要使用 UL/ANSI Grade 或者燃烧等级，如 FR-4，V-0 等，作为电路板产品型号名称。

The kernel controller uses industrial PC in the system, using CPLD logic element to combine to the external device, implement the fault testing of the circuit hoard and present the maintenance and repair suggest.

针对某型改装水陆坦克增加的火控系统电路板的信号特点，研制了火控系统电路板检测系统；该系统采用工控PC机为控制核心，利用CPLD的逻辑单元与外部器件相结合，实现电路板的故障检测并提出维修建议；该检测系统经列装部队试用表明，能够满足电路板的实时检测要求，具有良好的军事和经济效益，目前该检测系统已通过技术鉴定。

The circuit board fault detection and diagnosis system, which was designed for neotype weapon equipments, not only could resolve the problem that external test resources were too limited ,while there were too many quantities and types of circuit board test signals, but also could find the fault slug.

基于某新型武器装备的电路板故障检测诊断系统，不仅可解决外部测试资源有限，而电路板测试信号数量和类型过多之间的矛盾，而且可实现电路板故障定位，将故障定位到相应的元器件。

And an on-line adaptative training algorithm of the weights of neuron is given, which enhances fusion precision of the model, fault tolerance and adaptive ability for subsystems 4 In order to diagnose the soft fault of integrated system, a new fault detection method is proposed based on federated filter, which can detect fault of system in short interval and greatly enhance the method sensitivity to fault A fault diagnosis method of Dynamically Tuned Gyro baesd on parameter estimation of kinetics model of rotor, and signal pretreatment, parameter estimation and strategy of fault identification are studied in detail The method can locate fault of DTG correctly and effectively, which provides a new approach and idea for gyro fault diagonsis 5 In order to diagnose the hard fault of integrated system, fault tree analysis is studied on fault disgnosis of integrated system circuits, and the hardware and software of disgnosis system are developed, with faults located to main module and circuit For futhur diagnosis, an optimal measurement technology in detection of circuits is discussed by improving an algorithm based on information theory, and a pratical method based on half-split method is proposed.

针对组合系统的软故障诊断问题，提出了基于联合滤波模型的一种新的故障检测算法，给出了算法的理论推导过程，该算法能在较短的时间内检测出系统故障，提高了算法对故障的敏感度；研究了基于动调陀螺转子动力学模型参数辨识的故障诊断方法，就其中的信号预处理、参数辨识及故障决策方法等关键技术进行了详细的研究，该方法可以正确、有效地检测与定位动调陀螺故障，为陀螺故障诊断提供了新的途径和思路。 5。针对组合系统的硬故障诊断问题，研究了基于系统浅知识推理的故障树法在组合系统电路子系统故障诊断中的应用，开发了相关诊断系统的软硬件，故障可定位到系统的主要功能模块和电路板级。为了进一步的故障定位，研究了电路板故障的最优检测问题，完善了基于信息理论的优化算法，并提出了基于&对分法&的一种实用的优化算法，故障可定位到电路板的主要功能元件级。在组建的SINS/GPS组合系统实验平台上，针对上述研究内容，进行了大量的实验研究。

On the basis of electrical network characterization, Chapter 5 presents a new principle to detect PCB's fault first time. Three methods of online test for electrical network characterization are described in detail. Then, a hierarchical, combinatorial approach is firsfly presented. The test efficiency of this method is studied also. The experiment result shows that the new approach can greatly enhance the test efficiency of fixtureless tester under the requirement of 100% test for PCB's connections.

本文第5章利用集成电路的输出特性，首次提出了一种新的印刷电路板连接故障的检测原理，给出了三种印刷电路板电气网络输出特性的在线测试方法；在此基础上，首次提出并实现了基于飞针式在线测试仪的层式组合测试思想，研究了这种方法的检测效率；应用实例表明这种方法在不降低对印刷电路板连接故障100％测试的要求下，可以有效地提高飞针式在线测试仪的检测效率。

"Electronic 1C Chip drawing system" provides many functions such as "modify the position of the component"s diagram""modify the color of the component"s diagram""magnify and minify the component"s diagram without distortion""change the type of drawing line""edit some physical properties of the component""copy and paste diagram of one component""delete one or more component diagrams""move more than one components" positions""change the z_order of the diagram,set it to back or bring it to front""save the drawing of the electronic components to one file and the file extension name is *.brd""print the drawing".

电路板元器件绘制系统主要完成了使用鼠标拖拽、鼠标点按的方式绘制电路板上各种常见的元器件图形；编辑电路板上元器件图形的位置；编辑元器件图形的颜色；不失真的对器件图形进行放大和缩小；编辑元器件图形的线型；编辑电路板上各个器件的物理属性(比如电阻的阻值大小、电容的容量大小、额定电压等)；复制已经绘制出的电路板上的器件；粘贴剪贴板上的器件；删除单个或多个已经绘制出的器件图形；同时改变多个器件图形的位置；改变绘制区内各个元器件的z order顺序，也就是可以将层叠在一起的图形置前或置后；把绘制的电路板器件图保存到指定文件中；能打开、查看和修改保存的电路板器件图；打印电路板器件图。

The printed circuit board has in one side several flat-bottom notches with conductive layer and one conductor plug penetrating the printed circuit board and in the other side one heat conducting layer connected to the conductor plug.

其中，印刷电路板的一面具有多个平底凹杯，平底凹杯的底部为一平面，平底凹杯上具有一导体层，且平底凹杯的底部下方还具有一导体插塞贯穿印刷电路板，而印刷电路板的另一面则具有一导热层与导体插塞连接。

In this exemplary embodiment, the ground is provided by one layer of a circuit board which in this embodiment is a multi-layer circuit board.

在该示例性实施例中，通过电路板的一层提供地，该电路板在该实施例中是多层电路板。

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。