和电路

A combinational circuit that has three inputs that are an augend, D, an addend, E, and carry digit transferred from another digit place, F, and two outputs that are a sum without carry, T, and a new carry digit, R, and in which the outputs are related to the inputs according to the following table.

一种组合电路，有三个输入端和两个输出端；三个输入端是：被加数d、加数e以及从另一个数位传来的进位数f；两个输出端是：无进位和数t及新的进位数r。电路的输出和输入的关系如下表所示

First it produces the pulse signal by the multivibratorwhich is consisted of 555 timer and send in the detecting coil to form the alternating magnetic field, then it asopts UGN3503 linear half-effect as prode to the magnetic field change into the voltage signal change,after enlargement electric circuit and peak value examination electric circuit,the signal be treated to send into ADC0809 modulus converter change moduluses, then the digital signal after the modulus converter is changed is sent into AT89C51one-chip computers afterwards, after the digital filter, AT89C51one-chip computers afterwards compares the data to the reference voltage and judges whether to have detected the metal and alarm.

这个系统是以AT89C51单片机为核心，首先由555定时器构成多谐振荡器产生脉冲信号送入探测线圈以形成交变磁场，然后经过线性霍尔器件UGN3503将磁场变化转换为电压信号的变化，经过放大电路和峰值检测电路，经数模转换之后输入到单片机中，由单片机对数据进行软件滤波之后，与基准值比较之后，判断是否存在金属和报警显示。

This paper analyzed and researched the characteristics of Schmitt trigger, single-stable-state trigger and astable multivibrator constituted by 555 timer based on PSPICE. Against the phenomenon of astable multivibrator constituted by 555 timer has no oscillation in PSPICE, an effective analysis method was brought out for 555 timer circuit to simulate the actual oscillator.

作者在文中应用PSPICE对555定时器构成的施密特触发器、单稳态触发器和多谐振荡器的工作特性进行了仿真分析和研究，针对PSPICE中555定时器构成的多谐振荡器不起振的问题提出了模拟振荡电路的有效起振方法，对电子电路的分析与设计具有一定的参考意义。

Chapter one and chapter two analyse the basis theory and give a whole design plan and expatiate the basic exoterica of system inculding primary technology for application. It involves the basic control theory of satellite antenna and analyse for the whole function. Chapter three gives the hardware design which includes hardware etlectrocircuit structure, principle chart, selecting all kinds of parts of the apparatus , the sensor elements and the design of serial communication electrocircuit etc. Chapter four and chapter five introduce software design for the SCM and the personal computer, giving mainly design theory and material program which includ the design of searching for the satellite and searching for the high-point and the program development by Delphi on PC, explaining the basic principium of asynchronous serial communication for epigyny computer and hypogyny computer.

第一、二两章阐述了系统的理论基础及应用的主要技术，包括卫星天线控制基础理论和整体功能分析等等；第三章是系统硬件设计，包括硬件电路组成及原理图、各类元器件的选取及传感器原理，串行通信电路设计等：第四、五两章是单片机、PC机软件设计，给出了主要部分的设计原理及具体程序，包括监控软件设计、寻优设计、寻星设计，PC端Delphi程序设计开发等，并阐述了PC机和单片机异步串行通信的基本原理，是本课题的重点所在。

According to the training target of university, the characteristic of the course of Analog Circuits and the requirement of the following curricula,this paper discusses the teaching reform and the curriculum construction about the course of Analog Circuits in the aspects of training students' ability,converting Leching conceptions and reforming teaching methods and means.

文章结合高等院校学生培养目标，针对模拟电路课程的特点以及后续课程的要求，从培养学生能力、转变教学观念、改革教学方法和教学手段等方面，对模拟电路课程的教学改革和课程建设进行了探讨，强调必须坚持以应用为主要特征构建课程和教学内容。

This action of charging the capacitor is shown in the following equation: ADC Clock resistor RSW 式决定的:(1 K ) and RIN for the period S1 is closed; this period is controlled by ACQ_PS setting.

时间。然而这个时间远远大于外部的电阻和电容电路所消耗的时间，同时在计算电阻和电容电路时候的时间常数时，要考虑到外在附加的贴片电容和插针电容，对ACQ_PS 是一个非常高的值，而系统需要低采样频率。

A total of 14 book chapters and two appendices, a comprehensive introduction to the work of Protel 99 interface, the basic composition, a variety of commonly used editors and basic knowledge of common tools, and circuit design in accordance with the general process, starting from the user requirements, to the printout printed circuit board plate making plans until a detailed description of the circuit schematic design, netlist generation, single-sided and double-sided printed circuit board design method and the steps and so on.

本书共有14章和2个附录，全面介绍了Protel 99的工作界面、基本组成、各种常用编辑器和常用工具等基础知识，并按照电路设计的一般流程，从用户要求开始，到打印输出印制电路板制版图为止，详细地介绍了电路原理图的设计、网络表的生成、单面和双面印制电路板的设计方法及操作步骤等内容。

To improve the stability and the depth of the pseudo-potential well of the ion trap, two sets of RF sources and the corresponding detection circuits were designed and implemented in a Paul trap. With the implementation, absorbed signals of 199Hg(superscript +) and N(superscript + subscript 2) were detected from trapped ions.

为了满足离子囚禁稳定性以及提高离子囚禁势阱深度，设计和制作出两套囚禁离子的射频源和射频共振吸收检测电路，利用不同频率的射频源及相应检测电路在双曲线型离子阱实验装置中成功地囚禁了199Hg和N(上标+下标 2)离子得到了它们的射频共振吸收信号。

This thesis describes the preparation of HTS rf SQUID, the design of the readout andthe innovation of our inductively coupled tank circuit. Using this tank circuit and ourreadout, we achieved the flux white noise of 15 〓/√Hz for an HTS YBCO rf SQUIDwith the loop size of 100×100 μ〓, and a field sensitivity of 24fT/√Hz by using a 1 inchwasher flux focusor.

文中描述了rfSQUID样品制备过程和我们所研制的rfSQUID读出电路的设计思想和实现方法，给出了我们所发明的电感耦合谐振回路的特性，对于内孔为100x100 μ〓的rf SQUID样品，用这种谐振回路和我们的读出电路，白噪声可测到15μ〓/√Hz左右，用1英寸的聚焦器可获得24fT／√Hz的磁场灵敏度。

How to control level and temperature of material container is common issue of the automation design in chemical industry. In the paper, control configs of level and temperature in detail were analyzed, fault of the existing configs was found and the updated config which contains self-maintenance circuit and interlocking circuit was risen.

物料容器的液位和温度等工艺变量控制是自控工程设计中经常遇到的问题，文章针对液位和温度工艺变量控制方案的关键内容分别进行详细分析，发现现有方案存在的缺陷和误区，提出了自保持电路加互锁电路的改进方案。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。