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extra low frequency
相关语句
  超低频
     The theoretical equations on formation resistivity log across casing are presented according to electromagnetic theory. Models for magnetic lines are simulated by numerical method in respect to four frequencies (high,medium, low and extra low frequency).
     以电磁场理论为基础 ,给出了套管井地层电阻率测井问题的理论公式 ,并分别对高、中、低及超低频 4种频率的磁力线模型进行了数值模拟。
短句来源
     It is shown that the new method using extra low frequency electromagnetic wave to measure the formation resistivity through casing is effective.
     结果表明 :用超低频电磁波过套管测地层电阻率的测井方法是可行的。
短句来源
     Because of corrosion of metals,cathodic protection systems,rotation of shaft and electronic equipment on board,there were many kinds of electromagnetic signatures such as static electric,magnetostatic,alternating electromagnetic field and extra low frequency electromagnetic signature on ships.
     由于金属腐蚀、阴极保护系统、螺旋桨的转动以及船上电子设备等原因,舰船上存在着多种电磁特征信号,如静电、静磁、交流电磁场、超低频电磁特征信号。
短句来源
  “extra low frequency”译为未确定词的双语例句
     Extra Low Frequency Voltage Withstand Test of Motor Stator Winding of HV Generator and Remote Control
     高压电机定子绕组的超低频耐压试验与遥控
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  相似匹配句对
     Low and N.
     Low和N .
短句来源
     History and Evolution of Extra-low Carbon Steel
     超低碳钢的历史与发展
短句来源
     On the Opacity of Extra Low Weight Newsprint Paper
     关于超低定量新闻纸的不透明度
短句来源
     2. low
     2. 低速度 v<
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     E.T.The Extra-Terrestrial
     《E.T.外星人》重映版
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  extra low frequency
Right CDS nerve sections had much less effect, except on long whistles where extra low frequency sounds appeared, probably from the denervated right bronchus.
      
They introduce an extra-low frequency zero and a highfrequency pole to stabilize the loop.
      
Spectrum The range of electromagnetic energy from cosmic rays to extra-low frequency.
      


A cyclic simple shear test apparatus, based on a static simple shear test apparatus which has been developed in Nanjing Hydraulic Research Institute since 1964, is constructed. This apparatus is composed of a simple shear box, an electro-magnetic exciter, the static loading system and the electronic recording system. A sample with diameter of 7cm and height of 2cm is enclosed inside a rubber membrane which is in turn confined by steel rings and is attached rigidly to the end plates. By means of the horizontal...

A cyclic simple shear test apparatus, based on a static simple shear test apparatus which has been developed in Nanjing Hydraulic Research Institute since 1964, is constructed. This apparatus is composed of a simple shear box, an electro-magnetic exciter, the static loading system and the electronic recording system. A sample with diameter of 7cm and height of 2cm is enclosed inside a rubber membrane which is in turn confined by steel rings and is attached rigidly to the end plates. By means of the horizontal loading system the initial shear stress is applied to the sample. The vertical and horizontal loads are applied pneumatically and are controlled seperately by two regulating valves.The base of the simple shear box is connected with the excitor which applies the cyclic shear stress to the sample. The amplitude and the frequency of excitation is controlled by the extra-low frequency signal generator, and the signal generated by the latter is amplified and input to the excitor. The max. exciting force is 120kg, and the frequency generally used is 2~3 Hz. During the test the variation of dynamic shear stress, pore pressure and displacement are measured by the transducers and are recorded by the oscilloscope.This apparatus has been now tested, adjusted, and used to investigate the characteristics of liquefaction of some saturated sand samples. It is shown that this apparatus works fairly well. Furthermore, its construction is simple, and it can be operated easily. Therefore it is concluded that this apparatus may be used to study the dynamic behaviour of the soil either for the practical engineering project or for the research purpose.

在我所1964年制成的静力单剪仪的基础上,研制了一种振动单剪仪。此仪器由剪切盒、静力加荷系统、电磁式激振器和电子测量系统组成。剪切盒由多个圆环迭成,圆环内有橡皮膜,在其中安装试样.垂直和水平荷重是用气压施加的,并且分别由两个调压阀控制。利用水平加荷设备,可以使试样在各种不同的初始剪应力下振动.激振力是由超低频讯号发生器发出的讯号,通过功率放大器放大,再输入激振器而产生的。最大激振力为120kg,常用的频率为每秒2周。利用这种仪器,可以测量不排水试样在各种振动过程中的动剪应力、孔隙压力和位移,并确定其动剪切模量、阻尼比或液化强度等。经过初步试验,证明其性能尚佳.此仪器结构简单,加工容易,电子仪器设备可用国内产品配套,进行试验时制备试样和操作都比较方便,是目前一种比较实用的研究土的动力性质的仪器.

The theoretical equations on formation resistivity log across casing are presented according to electromagnetic theory. Models for magnetic lines are simulated by numerical method in respect to four frequencies (high,medium, low and extra low frequency).It is shown that the new method using extra low frequency electromagnetic wave to measure the formation resistivity through casing is effective. It provides a...

The theoretical equations on formation resistivity log across casing are presented according to electromagnetic theory. Models for magnetic lines are simulated by numerical method in respect to four frequencies (high,medium, low and extra low frequency).It is shown that the new method using extra low frequency electromagnetic wave to measure the formation resistivity through casing is effective. It provides a theory foundation for the casedhole log interpretation and the development of logging tools.

以电磁场理论为基础 ,给出了套管井地层电阻率测井问题的理论公式 ,并分别对高、中、低及超低频 4种频率的磁力线模型进行了数值模拟。结果表明 :用超低频电磁波过套管测地层电阻率的测井方法是可行的。该理论可为套管井地层电阻率测井仪器的研制及测井解释提供重要的理论依据

Since 1960's,lots of observed data on long-period events before earthquakes have been accumulated.These long-period events can be recorded by various kinds of observation systems,such as dislocation across faults,anomalies of extra-low-frequency electromagnetic waves and infrasonic waves,low-frequency guided waves under wells,well water level and so on.The long-period events before earthquakes have been theoretically demonstrated by fault creep before earthquakes,silent and slow...

Since 1960's,lots of observed data on long-period events before earthquakes have been accumulated.These long-period events can be recorded by various kinds of observation systems,such as dislocation across faults,anomalies of extra-low-frequency electromagnetic waves and infrasonic waves,low-frequency guided waves under wells,well water level and so on.The long-period events before earthquakes have been theoretically demonstrated by fault creep before earthquakes,silent and slow earthquakes,fracture pre-propagation of faults and fracture nucleation as well.The resolution of surface measurement of long-period events before earthquakes would play a decisive role in overcoming the difficulty of short-term and imminent earthquake predictions brought by "pre-earthquake quiet".At present,the primary problem is lack of network of observation system and research on physical mechanism.

自 2 0世纪 60年代以来 ,已经积累了许多地震前长周期事件的观测资料。这些长周期事件可以被很多不同的观测系统记录到 ,如跨断层形变、超低频电磁异常、次声波异常、井下低频导波、井水水位等。理论上对地震前长周期事件已给出了许多论证 ,例如 ,震前的断层蠕动、静地震与慢地震、断层的断裂预扩展和地震成核等。解决震前长周期事件的地面可测性 ,对突破“震前平静”带来的短临预测的困惑会起到举足轻重的作用。目前的主要问题是缺乏网络化的系统观测和对物理机制的研究

 
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