和电路

On the basis of the structure of a pole conductivity detector for an integrated low voltage electrophoresis chip,a contactless conductivity detecting circuit is designed according to the working principle of high frequency contactless conductivity detecting,which consists of an AC inspiriting signal generator,a I-V convertor,a multiplicator,a low-pass filter and a differential amplifier.

根据低电压集成电泳芯片柱端非接触高频电导器的结构和非接触高频电导检测的基本原理，设计了非接触电导检测电路。该电路包括AC激励信号发生器、I-V转换器、乘法运算器、低通滤波器和差分放大器。

Summary This paper analyzes the working principle and stability of a transistor mul- tivibrator operating as a frequency divider,with both sides being synchronized by the input signal.It is found that the frequency division stability of this circuit can further be increased when the multivibrator operates in the second class of oscillating condition,and that the optimum operating point is best determined from the actual base voltage changing characteristic.

本文分析了晶体管自激多谐振荡器用作双侧同步分频电路的一般理论和分频稳定性，并考虑基极电压变化规律来确定最佳分频的工作状态和运用点，同时对同步脉冲的引入问题亦作了原理性补充，还提出了振荡于第二类状态下的自激多谐振荡器可获得高稳定性的分频，以及此类双侧同步分频电路的设计方法。

The circuits, including 4 value TTL, NOR gate and NAND gate and AND OR NOT gate and five state gate, are designed by use of bipolar transistors. They have good I/O characteristics, great load capacity and robust noise immunity, and their noise margin may reach±0.6V.

采用双极型晶体管设计出了四值TTL"或非"门、"与非"门和"与或非"门电路及五态门，这些电路均具有较好的输入输出特性、较强的负载能力和抗干扰能力，噪声容限可达到± 0 。6V。

The standards specify several types of end user access circuits, each of which involves one or more B channels and one D channel. The B channels are for circuit-switched user communications, and the D channels are primarily for signaling and control (e.g., on-hook and off-hook signaling, ringing signals, performance monitoring, synchronization and error control).

该标准详细列出了几种终端用户电路类型，每一种类型包含一个或多个B信道以及1个D信道。B信道用于电路交换用户通信，D信道主要用于信令和控制（例如挂和摘机机信令、振铃信号、性能监控、同步以及错误控制）。

To some problems of it, the design train of thought that only A/D, subdivision and counting circuit compose open-loop control system is proposed in this paper. It thoroughly renovates traditional design train of thought; Integrated subdivision circuit on the basis of AD2S90 and QA740210 is proposed and designed; Digital readout system has simple PLC function and realizes communication between it and PC; Advanced LCD technology is adopted; Using software error amendment realize dynamic compensation for error; Intelligence digital readout system by inductosyn having high accuracy and multifunction is designed.

针对目前感应同步器数显表存在的一些问题，本论文研究中提出了仅有A/D转换、细分和计数电路组成的开环控制系统的设计思路，彻底革新了传统的设计思路；提出并设计了基于AD2S90和QA740210的集成化细分电路；使数显表具有了简易PLC的功能，实现了上位机PC和数显表之间的通讯；采用了先进的LCD液晶显示技术；利用软件误差修正方法可以实现对误差的动态补偿；开发设计了精度高、功能多的智能数字化感应同步器数显表。

The system includes a first circuit component and a second circuit component in a path between a high voltage state and a low voltage state, such as ground.

所述系统包括在高电压状态和低电压状态之间路径内的第一电路组件和第二电路组件。

This paper presents the work principle and the design of the high-speed water jet loom and the design process of the control system,including the dardware and the software,and how to protract the circuit principle fig and PCB.

本文主要介绍了高速喷水织布机的工作原理及设计要求，叙述了喷水织布机控制系统的设计过程，包括硬件电路和软件编程，以及用Protel DXP软件绘制电路原理图和PCB图的方法及步骤。

This treatise presents the overall technical plan and design of the semi-active laser proximity fuze, which will be applied for 37 mm antiaircraft guns.

本论文以37 mm口径高炮为平台，对半主动式激光近炸引信从总体上作了研究和设计：从激光发射机、激光的大气传输、激光接收机到引信的信号处理电路、执行电路都作了详细分析，同时提出了在半主动式激光近炸引信条件下的激光探测和目标识别原理。

Firstly, based on the developed vibration testing method, a method for monitoring abrasion fault on main bearing of reciprocating engine using noise measurement is presented.

在比较几种传统方法后，提出了采用高速数字信号处理器DSP电路和插值算法来进行噪声信号的时域同步平均处理。克服了基于锁相环电路采样方法跟踪精度低、速度慢和使用不便的缺点。

With the gain-boost technology,the operational transconductance amplifier used in this analog-to-digital converter achieves enough DC gain and unity-gain frequency under the low voltage supply and to guarantee the performance of the sample and hold circuit and the sub-stages.

同时利用增益增强技术设计高直流增益和高单位增益带宽的运放，从而保证采样保持电路和子级电路的性能。

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。