多电路的

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。

Besides, several representative designs of four value counter are presented and its method can be applied to the design of arbitrary value counter.

目前，三值逻辑设计理论已逐渐逐向成熟，这方面已有较多论述[1～4]。而四值逻辑设计，尤其是利用电压型四值逻辑电路实现四值时序逻辑电路设计的论述尚少。

Single phase bridge controlled rectifier circuit is widely used in the project.

单相可控整流电路中应用最多的是单相桥式全控整流电路。

The address calculating circuit is very simple and consists of three adders and pq 4:1multiplexers,which calculates pq addresses for the pq memory modules in parallel.

其地址计算电路极其简单，仅含3个加法器和pq个4：1多路器，能够同时为pq个存储模块计算地址；数据分布电路只有一个，用来完成读出和写入时数据在数据寄存器和存储模块之间的分布。

A term applied to a circuit in which two or more load items are connected in a chain.

一种电路连接术语，适用于两个或多个负载以链式相互连接的电路。

It is consisted of two circuits: the high frequency converter and the electromagnetic switch contact state sensing circuit without any sensor. There are more advantages in this technology than in those dealt with the problems in commercial frequency.

提出了一种互补式开关新技术，它由两个新电路构成，即高频开关变换器与电磁开关触点状态无传感器实时采样电路由于以高频处理方式来解决此类工频电工问题，较传统方法有更多优点，因此具备了解决上述难题的条件。

The multifunctional interface circuit based on 1394 is a new application for ieee 1394. it is a hot spot to research and design the multifunctional interface circuit based on 1394, can realize the interconversion between different interfaces, and make the rapid transmission of data easier.

基于ieee 1394的多功能接口电路是ieee 1394技术的新应用，研究和设计基于ieee 1394的多功能接口电路可以实现不同接口之间的相互转换，方便数据的快速传输。

It consists of many ele- mentary pulse networks such as: Transistor forming and shaping circuit,trrnsistor blocking oscillator,multivibrator,time delay circuit and "and" gate,etc.

本文专门讨论了利用脉冲选择的晶体管化同步分频系统的线路综合原理和研制技术问题，对组成系统的各种单元脉冲电路，如晶体管窄脉冲形成器，晶体管间歇振荡器，晶体管多谐振荡器，晶体管延迟电路以及晶体管门电路等均作了较深入的分析，并给出相应的实验结果。

B-ISDN supports switched, semipermanent and permanent point-to-point and point-tomultipoint connections and provides on demand, reserved and permanent services. Connections in B-ISDN support both circuit mode and packet mode services of a monoand/or multi-media type and of connectionless or connection-oriented nature and in a bidirectional or unidirectional configuration.

B-ISDN支持可交换的、非永久性的以及永久性的点对点和一点对多点连接，同时提供按需的、预留的和永久的服务。B-ISDN内的连接支持单个和/或多个媒体类型电路模式和分组模式服务，以及无连接或面向连接性的电路模式和分组模式服务，并且采用双向或单向结构。

ABSTRACT Analysis of the time-domain response of multiconductor transmission lines is important for the design of interconnects in high-speed integrated circuits, in electrical power distribution systems, and in electromagnetic pulse investigations.

高速电路中的连接线通常是由多导体传输线构成，其时域响应的分析对高速电路系统的总体性能指标的保证及系统的设计关系极为重要，同时其理论和计算方法也可用于电力传输系统中的瞬态分析及电磁脉冲的研究等多个领域。

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。