Based on the basic structure and some realistic requirements of well trajectory automatic control system through comparing and sieving information transmission methods a method of downward communication of transmitting surface order to downhole system by controlling the rotation speed of drilling string is presented .

根据井眼轨道自动控制系统的基本构成和实现要求，对信息的 传输方式进行了比较和筛选，提出了通过控制 钻具旋转速度的方式将地面的指令传送给井下系统的通讯方式。

Test Study of Mechanical Vibration Characteristics of EHV Transmission Line Insulators String

线路绝缘子 串机械振动疲劳性能的试验研究

Study on Information and Power Transmission Based on An Intelligent Drill String

智能钻 柱信息及电力 传输系统的研究

This article introduces 500 kV down V-shaped insulated string of implementation and network operation . It also provides the solutions and practical experiences to the ice regional transmission lines overhanging insulated string prone to ice flash cordial failures .

介绍500kV倒V型绝缘子串改造项目实施及挂网运行情况，为解决500kV 输电线路覆冰区悬垂绝缘子 串冰闪故障提供了解决方法和实践经验。

A Research on the Logging While Drilling Acoustic Data Transmission Based on Periodic Drill String System

基于周期性钻 柱系统的随钻数据声波 传输方法研究

In Visual Basic there are two forms of parameter transmission . One is value transmission and the other is address transmission . The realization method of calling API function by using the string as parameter in VB is introduced .

在VISUALBASIC中，参数传递有两种形式，一种是值传递，一种是地址 传递，本文介绍了VB中 字符串作参数调用API函数的实现方法。

In addition the transmission ratio of cavity mirror has an optimum value because of the influence of temperature on the output of the pulse string .

另外，由于温度和热容激光器脉冲 串输出方式的影响，总脉冲 串输出能量在腔镜 透射率上也将有一个优化值。

Design Optimization of Pressure Transmission System of Annulus Pressure Firing Perforated String

环空加压引爆射孔 管 柱 传压系统的改进设计

Acoustic Transmission and Measurement Method for Near-bit Dynamic Force Signal of Bottom Drill String

底部钻 柱近钻头动态力测量及声 传输方法