Then maps show all the H_x,H_z and ΔH_x curves and their normalized H_x and ΔH_x curves of electromagnetic field about linear electric current on different depth from 1 to 21 meters,maps also show the H_x,H_z curves of electromagnetic field about linear electric curr.
研究了管线的一系列电磁场特征,介绍了特深管线探测应用状况,通过实例分析了从1 m到21 m了不同埋深直线电流及强电流3~21 m情况下的电磁场Hx、Hz、ΔHx的归一化异常的分布特征,提出了对特深管线探测的对策,即频率、电流、远端接地等提高信噪比的技术对策,提出了确定地下金属管线平面位置、埋深的方法,利用水平磁场分量70%法确定管线深度的适用条件,分析了特深管线探测的干扰因素,广州市3个特深管线的探测成功实例,说明了方法的良好效果。
The distribution features of abnormal points of H_x,H_z about the primary electromagnetic field in different depths on the linear electric current are analyzed.
介绍了水平定向钻在地下管线施工方面的应用状况;分析了不同埋深直线电流一次电磁场Hx、Hz的归一化异常的分布特征,以及确定地下金属管线的理论依据;提出了对深埋>3 m的地下管线探测时应采用的频率、电流、远端接地等提高信噪比的技术对策,及利用水平磁场分量70%法确定管线深度的适用条件;列举了3个长距离、深度>10 m过江深埋管线的探测实例,说明方法的有效性。
Research on Modeling, Control and Experiment of a High-Response Short Stroke Linear DC Motor;
高响应短行程直线直流电机的建模、控制与实验研究
Research and Development of Control Software for Linear DC Motor Based on DSP;
基于DSP的直流直线电机控制软件的研究与开发
The only access points for transients are via the AC or DC power line wires and all of the data and telcom signal wiring that enters and leaves the cabinet.
电涌的唯一进入通道是交流或直流电源线及所有进出金属箱的数据线和信号线。
circuit design, wiring diagrams, schematics, AC/DC sources
电路设计, 接线图, 示意图, 交流/直流电源
On-line insulation monitoring of substation DC power supply
变电站直流电源绝缘在线监测新方法
The Design and Application of Common DC Bus Power Supply
公共直流母线供电电源的设计与应用
Design of 140KV High-Voltage DC Power-supply for X-ray Tube;
X射线管用140KV高压直流电源的设计
New Type of High-power Linear DC Voltage-stabilized Power Source in Eddy Current Dynamometer
新型电涡流测功机大功率直流线性稳压电源
Application of CAN bus to distributed DC 110 V for electric locomotive
CAN总线在电力机车分布式直流110V电源中的应用
A new method for diagnosis of the linear DC electric source circuits locating step by step
线性直流电源电路的分步故障定位新方法
HVDC transmission line pole
高压直流输电线路极线
Fault diagnosis of linear DC electric source based on ant colony algorithm and neural network
基于蚁群神经网络的线性直流电源故障诊断
The Necessity and Solution of DC Power Supply Equipment On-line Monitoring
直流电源设备在线检测的必要性及实现方案
AC current or voltage source. DC offset can be specified.
交流电流源或电压源。可指定直流偏移。
Operation From DC Power Supply: Batteries.
使用直流电源：干电池。
CBF series are able to be applied to large current DC power line.
CBF系列的晶片能够应用于大电流的直流电源信号线.
combined a.c. and d.c. welding power source
交直流两用弧焊电源
transistorized regulated DC power supply
晶体管直流稳压电源
Low voltage DC power is also provided for control power and emergency power.
低压直流电作控制电源和应急电源。
Study on Active Fiber DC Transducer Used in HVDC;
高压直流输电有源光纤直流电流传感器的研究