基本回路

Then, we construct a network model of the max-min spanning arborescence problem, we discuss the essential character of the max-min spanning arborescence and deduce an effective algorithm to solve this problem based on the relationship between the minimum in-arc circuit and the max-min spanning arborescence.

3最大最小树形图问题，即基于实际背景，建立求网络的最大最小树形图的模型，研究最大最小树形图的基本性质，并以最小入弧回路与最大最小树形图的关系为基石，介绍求网络的最大最小树形图的有效算法。

For this purpose, an investigation to determine the elementary critical circuit (include the order of the nodes in the circuit) is made in precedence.

文中给出了托盘优化配置的一个算法，算法的基本思想是在系统的时序事件图中的关键回路上的合适的位置结点中，增加适当数量的初始令牌，以达到减小系统矩阵的特征值的目的。

And the composed structure of the decentralized control and distributed control and hierarchic control can also be implemented with them.

单回路调节器是计算机控制系统中最简单的应用形式，也是现代控制系统中的基本单元。

The basic principles of thermocouple temperature measurement are two different components of the composition of the homogeneous conductor closed-loop, when the temperature gradient at both ends of existence, the circuit current will have passed, at this time exist between the two ends of Seebeck electromotive force -- Thermal electromotive force, which is the so-called Seebeck effect.

热电偶测温的基本原理是两种不同成份的均质导体组成闭合回路，当两端存在温度梯度时，回路中就会有电流通过，此时两端之间就存在 Seebeck 电动势——热电动势，这就是所谓的塞贝克效应。

Taking frequency conversion of semiconductor transistor as an example, the basic principles and some problems related are introduced in the article, integrating emitter-injected frequency conversion circuit of transistor, which is often used in superheterodyne to discuss about it.

分析了变频的基本原理和设计变频器的有关注意问题；从三极管输入回路和输出回路的信号入手，讨论了超外差式收音机常用的变频电路的工作原理。

Chapter 2 will give basic ideas of phase-locked loops as well as some important characteristics in a frequency synthesizer.

在论文中，第二章会介绍锁相回路的基本理论以及频率合成器的重要特性。

Based on the analysis of the stability of the nature tailless UAV, The control system of the tailless UAV is designed by using the classical control method and a time-based method is used that can tune up control law parameters automatically by virtue of optimizing.

为了使所设计的控制器参数较优，本文以滚转保持与控制模态为例，采用了一种带有时域约束的优化控制方法设计出这些回路的基本控制律参数，并针对各控制模态在频域内进行稳定性分析，证实了该调参方法在工程上可以得到很好的应用； 4。

The examination falls into two parts: the written test and the operation test. The written test is to check one's basic electric knowledge, which includes electric control theories, installation standards, etc. The operation test is a bit difficulty. Firstly, you have to connect several major loops and control loops appointed by the examiner within limited time. If you do right, the electricity is connected, the bell rings and the light turns on, then you will pass the test; but if it explodes and emits smoke, then you will not only get zero score but be scolded. Life is not a game, and one should never pretend to know things that he does not know.

考试分笔试和操作二项，笔试的内容都是最基本的电工知识，电气控制原理，电气安装规范等等，而考操作就有难度了，首先要你在规定的时间里接好考官指定几的主回路和控制回路，接对了，通上电，灯亮铃响顺利过关；若是爆炸冒烟，那不仅没分还要挨骂，生命不可儿戏，不懂不能装懂。

Firstly, velocity expression of translational parallel manipulator was presented based on the screw theory. Secondly, the actuated screw, the actively unactuated screws and idle screws of each limb were determined according to the reciprocal screw theory. Then, all basic kinematic chains were enumerated by means of the number of limb connectivity and the limbs containing closed-loops were obtained by replacing the passive prismatic joints in the basic kinematic chains with planar closed-loop structures.

首先基于螺旋理论给出移动并联机构的速度表达式，然后根据互易螺旋理论确定出分支的主动螺旋、可动非主动螺旋和惰性螺旋，再依照分支连接度的不同列举出所有可行的基本分支运动链，并通过运动副替换得到分支中含有闭回路结构的运动链，最后利用所综合出的支链按照主动副的配置要求将动平台和静平台连接起来即可实现预期的机构。

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。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。