voltage controlled attenuator

To change the limit of LPR test valve which need annulus pressure to keep static in opening period,a new model pressure controlled full bore testing valve which is applied for our oilfields' features is developed.

为改变目前LPR压控测试阀在开、关井过程中需要保压的局限性 ,研发了一种适应我国油田特点的新型全通径压控测试阀。

An optimization design algorithm is presented for improving the performance of GaAs MMIC (microwave monolithic integrated circuit) negative resistance voltage controlled active bandpass filter.

在前期对GaAs微波单片集成电路负阻压控带通有源滤波器进行理论及实验研究的基础上 ,针对国内工艺技术的特点 ,提出了提高其性能的电路结构及其设计技术 。

384 MHz voltage control oven crystal oscillator.

384MHz小型压控恒温晶体振荡器,通过修正变容二极管的非线性,改善了压控线性度,满足了用户要求。

The feature,principle and design of the precision voltage control function generator ICL8038 produced by the Company INTERSIL are introduced.

介绍了INTERSIL公司的精密压控函数发生器ICL8038的特点、原理、设计,同时论述了基于该器件的FSK调制器设计方

Remold of hydraulic control system for ladle slide plate in steel-making works;

炼钢厂大包滑板液压控制系统的改造

Design of hydraulic control switch for blocking water in oilfield;

液压控制堵水开关的设计

The Application of Electrorheological Technology on Hydraulic Control System;

电流变技术在液压控制中的应用研究

The study of relationship between PM_(10) concentration and weather system indicates that the peak concentration pollution easily appeared under the high-pressure control system,and PM_(10) concentration is relatively lower under the easterly system.

PM10质量浓度与天气系统相关性研究表明,在高压控制时容易出现高质量浓度的污染,在东风带系统出现时PM10的质量浓度较低。

Application of changeable frequency & adjustable rate technology in constant pressure controlling system for chlorine gas carrying;

变频调速技术在氯气输送恒压控制系统中的应用

The stability of a testing stope of No.1 orebody in Jinfeng and the practice of ground pressure control;

金凤公司1号矿体试验采场稳定性及地压控制的实践

Ground pressure control is a major content in block caving process.

地压控制是自然崩落法采矿活动过程中的一项重要内容 ,拉底与放矿工作是控制地压的最主要的手段 ,也是最有效手段。

Also,the article out-lines the progress of ground pressure control technology in domestic and overseas mines,and point out the existing problems and develo-ping targets for China s ground pressure control research.

简要介绍了金属矿山地压控制技术的研究内容,综述了国内外地压控制技术研究进展,指出了我国金属矿山地压控制研究存在的问题和发展方向。

Frequency conversion of the constant pressure control in oil pump test platform;

输油泵测试平台中恒压控制的变频实现

It is emphasized on how to improve the system s reliability and how to lengthen its work life while the constant pressure control system is designed.

在恒压控制系统设计过程中,侧重于从提高系统的可靠性和延长整机寿命角度出发,结合硬件特点,要求系统每次启动时将变频器按序分配给一台泵机,而其余泵机按照“先进先出”控制方式参与工频工作,在编程时通过建立和运算队列使上述思想得以实现。