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a wall
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  墙体
    It has a LC oscillator in it used to detect all kinds of metal objects in a wall such as corrugated steel bar,metal water pipe etc.
    该探测器采用一个LC振荡器用以检测墙体中各种金属物 ,例如钢筋、金属水管等。
短句来源
    With a simple window comparator and LEDs the distance between the detector and the object in a wall can be displayed approximately.
    用窗口比较器和LED可大致显示墙体中被测物体与探测器之间的距离。
短句来源
    The principle of electromagnetic induction is to be used to detect AC living wire in a wall,the circuit is simple but reliable.
    用电磁感应原理来检测墙体中带交流电的火线 ,其电路简单而可靠。
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  a wall
High-resolution transmission electron microscopy observation indicates that the nanocapsules are hollow-structured with a wall thickness of about 6 nm.
      
Dependences of the evaporation rate of a water droplet suspended in air on its radius and distance from a wall are determined.
      
The stability of the laminar flow regime in the boundary layer developed on a wall is increased considerably by the relatively slight extraction of fluid from the wall [1-4].
      
The effect of hydrodynamic friction on the stability of a wall layer in annular two-phase flow
      
The problem, considered in [1], is posed of cavitation flow past a slender wedge (bump) consisting of a flat plate mounted at the small angle a to a wall.
      
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An apparatus for flow injectionanalysis with anodic strippingvoltammetry is described.A wall-jet electrode is used.The diameterof the nozzle is 0.32mm.The wholesystem is controlled by a 8 bi mi-crocomputer.The relative standarddeviation in determining 5×10~(-8)M Cd(Ⅱ)is 1.26%.

本文介绍一台流动注射阳极溶出伏安仪。仪器采用壁喷流通电极,进口喷嘴直径为0.32mm。整个系统用一台8位微机控制。实验结果表明,对5×10~(-8)M Cd(Ⅱ)连续测定34次,相对标准偏差为1.26%.溶出峰电流与浓度的线性相关系数为0.999.

Introduces a detector for the corrugated steel bar,metal pipe and living wire in the wall.It has a LC oscillator in it used to detect all kinds of metal objects in a wall such as corrugated steel bar,metal water pipe etc.The output amplitude of the oscillator is controlled by a junction type field effect transistor,which works as an automatic amplitude regulator.A sample-and-hold device consist of a operational amplifier with very high input impedance and a capacitor can establish a floatable base,therefore...

Introduces a detector for the corrugated steel bar,metal pipe and living wire in the wall.It has a LC oscillator in it used to detect all kinds of metal objects in a wall such as corrugated steel bar,metal water pipe etc.The output amplitude of the oscillator is controlled by a junction type field effect transistor,which works as an automatic amplitude regulator.A sample-and-hold device consist of a operational amplifier with very high input impedance and a capacitor can establish a floatable base,therefore automatic zero-adjusting is realizable.With a simple window comparator and LEDs the distance between the detector and the object in a wall can be displayed approximately.The principle of electromagnetic induction is to be used to detect AC living wire in a wall,the circuit is simple but reliable.The detector without a micro-controller has the function of zero-adjustment.And has the virtues of low cost,stability and utility.

介绍了一种墙体中钢筋 ,金属水管 ,电线探测器。该探测器采用一个LC振荡器用以检测墙体中各种金属物 ,例如钢筋、金属水管等。振荡器的输出幅度是用作为幅度控制器的结型场效应管控制的。由高输入阻抗运算放大器和电容构成的采样保持器形成浮动的基淮 ,于是可实现自动调零。用窗口比较器和LED可大致显示墙体中被测物体与探测器之间的距离。用电磁感应原理来检测墙体中带交流电的火线 ,其电路简单而可靠。该探测器不用单片机但具有自动调零功能 ,且具有低价 ,稳定 ,实用的优点

A measuring method combining main magnetic flux and magnetic flux leakage for approaching the residual wall thickness of the oil well tubing in-service was presented. The testing principle and design of sensor were introduced. Magnetized circumferentially, the oil well tubing went forward in a helical way while the testing sensor was fastened. Main magnetic flux testing method was used to measure the large area loss of a wall thickness and magnetic flux leakage testing method was used to measure the small...

A measuring method combining main magnetic flux and magnetic flux leakage for approaching the residual wall thickness of the oil well tubing in-service was presented. The testing principle and design of sensor were introduced. Magnetized circumferentially, the oil well tubing went forward in a helical way while the testing sensor was fastened. Main magnetic flux testing method was used to measure the large area loss of a wall thickness and magnetic flux leakage testing method was used to measure the small one precisely. The two kinds of signals with different frequencies could be seperated by filter with software. Experiment showed that the method could be used to the classification of oil well tubing for different residual wall thickness.

提出采用主磁通与漏磁通相结合的方法检测在用油管剩余壁厚的方法。分析了检测原理,介绍了检测传感器的设计。检测时,沿油管周向磁化被测管段,油管螺旋前进,检测探头固定,主磁通用于测量油管的大面积剩余壁厚,漏磁通用于测量小面积壁厚变化,两种不同信号可用软件进行滤波区分,最终达到精确检测剩余壁厚的目的。试验表明了该方法可用于油管剩余壁厚分类。

 
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