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seismic waves
相关语句
  地震波
     Moreover,for Renhechang shallow tunnel,the attenuation parameters of seismic waves along the tunneling direction are K = 232.8 and α = 1.90.
     人和场隧道掘进前方的地震波衰减参数为K=232.8,α=1.90。
短句来源
     Seismic Waves is Viscoelastic Medium
     粘弹性介质中的地震波
短句来源
     Analysis of Shock Characteristic for Explosion Seismic Waves
     爆炸地震波的冲击特征分析
短句来源
     STUDY ON PROPAGATION CHARACTERISTICS OF BLASTING SEISMIC WAVES IN A ROCK MEDIUM AND NUMERICAL CALCULATION
     爆破地震波在岩石介质中传播特性与数值计算研究
短句来源
     Eduardo L Faria and Paul L Stoffa's algorithm for computing the first breaks of seismic waves in transversely isotropic medium may be improved reasonably.
     本文对 Eduardo L Faria和 Paul L Stoffa提出的在横向各向同性介质中计算地震波初至旅行时的算法做了改进。
短句来源
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  “seismic waves”译为未确定词的双语例句
     Reflection and transmission of seismic waves at an interface between two saturated soils
     Reflection and transmission of seismic waves at an interface betwen two saturated soils
短句来源
     DYNAMIC CHARACTERISTICS OF SEISMIC WAVES WITH BIOT COUPLING
     Biot耦合模式波的动力学特征
短句来源
     CHARACTERISTICS OF SEISMIC WAVES BEFOREAND AFTER WUYUAN Ms4.2 EARTHQUAKE
     五原4.2级地震前后地震波形分析
短句来源
     Then, the time domain analysis method is used to explore the relationship between the properties of seismic waves' spectrum and the effect of conductors on transmission towers.
     分析了行波效应对输电塔地震反应的影响,发现杆件应力、导线张力、绝缘子张力受行波效应的影响较小,而导线、绝缘子的位移受行波效应影响很大。
短句来源
     The observation and analysis of the seismic waves of man-made explosion source in Changle, Fujian
     福建长乐人工震源波的观测与分析
短句来源
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  相似匹配句对
     STUDIES ON SEISMIC WAVES
     地震波研究
短句来源
     Converted waves in seismic record
     地震记录中的转换波
短句来源
     Radio Waves
     无线电波
短句来源
     On seismic resolution
     地震分辨率
短句来源
     POWER WAVES
     (威力波)横空问世
短句来源
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  seismic waves
The research topics include: numerical modeling of random seismic waves, probabilistic density evolution analysis for nonlinear structural responses, and seismic reliability analysis of large-scale lifeline networks.
      
The corresponding evolution equation of the seismic waves emitted by the vibrator is a generalization of the Burgers-Korteweg-de Vries equation.
      
Taking the microparticle rotation effect into account leads to bimodal wave vibrations, and under conditions of long-short-wave resonance the nonlinear generation of high ultrasonic frequencies by seismic waves is possible.
      
Application of hydroacoustic radiators for the generation of seismic waves
      
To excite seismic waves with a high coherence, powerful hydroacoustic radiators placed in a natural reservoir were used.
      
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The problem of primary importance in the study of reflection or refraction seismograms is to recognize effective impulse on the records. If a single seismometer were utilized to determine movement of the ground following a shot, it would generally be quite difficult to distinguish with surety the effective waves from spurious energies recorded on the seismogram. In seismic prospecting, the visual identification of effective waves is made possible by the method of simultaneously recording the motion of ground...

The problem of primary importance in the study of reflection or refraction seismograms is to recognize effective impulse on the records. If a single seismometer were utilized to determine movement of the ground following a shot, it would generally be quite difficult to distinguish with surety the effective waves from spurious energies recorded on the seismogram. In seismic prospecting, the visual identification of effective waves is made possible by the method of simultaneously recording the motion of ground by using as many as 20 to 60 separate detecting seismometers on the same record. The alignment of the impulsive forms across the seismogram is usually referred to as "line-up" or "cophasal-axis" of seismic signal. By using the general probability distribution function of Rayleigh and assuming that seismic waves, are of the Ricker wavelet form, the problem of determining how far random noise statistically limits the detection of seismic cophasal axis in seismogram is studied. The idea that determination of signals of minimum detectable signal—threshold and the dependence of signal threshold on some kinds of parameters was discussed in detail. It may be of interest to mention that signal threshold may be controlled by such interference systems as multiple seismometers, pattern shooting, mixing circuits and magnetic head combination method in reproduction.

在地震勘探中,有效地震波是在干扰背景上进行記录的,在記录上識別有效波一直是地震勘探的基本問題。本文中,我們假定地震脉冲是雷克对称形式的波漣,用随机过程分析法,討論了地震脉冲在平稳正态分布随机干扰影响下的幅度和相角分布函数及其它主要的統計特点,并指出地震脉冲波同相軸能够予以識别的条件,同相軸的可靠程度,能够予以識別的同相軸对应要求的最少地震脉冲波瞬时强度——門限值,并分析了用組合方法控制門限值的方法。

In many regions, the superficial layer consists of low velocity, unconsolidated sediments overlying more competent beds with higher velocities. When the unconsolidated layer is sufficiently thin, say, less than a wave length, the layer may be regarded as a loaded membrane which possesses only inertia, but offers no elastic reaction. Different phases of seismic waves are generated by an internal point source in an elastic halfspace covered with an unconsolidated superficial layer and their effects on the...

In many regions, the superficial layer consists of low velocity, unconsolidated sediments overlying more competent beds with higher velocities. When the unconsolidated layer is sufficiently thin, say, less than a wave length, the layer may be regarded as a loaded membrane which possesses only inertia, but offers no elastic reaction. Different phases of seismic waves are generated by an internal point source in an elastic halfspace covered with an unconsolidated superficial layer and their effects on the reflection of seismic waves are discussed. The results show that (1) there are two modes of Rayleigh waves whose dispersions are controlled primarily by the thickness of the superficial layer and the shear velocity in the elastic substratum. Besides the ordinary body waves and surface waves, other types of waves with the amplitude factors varying inversely as the square of epicentral distance are also evaluated; (2) when a ptane wave is incident from the underlying elastic half-space, the reflection coefficient depends not only on the incident angle, but also on the frequency. It is in general a complex quantity.

本文将地表疏松风化层看作是附在弹性介貭上的一种有慣性而无弹性的薄层,当扰动在弹性介貭中传播吋,风化薄层跟随振动;討論了弹性半空間內点震源产生的地震波和疏松薄层对地震波反射的影响。

The present paper describes a portable and simple electronic circuit, which when incorporated with a pulse cathode ray oscillograph can be used in an ordinary seismic wave model experiment. The preamplifier has a pass band of 2—700 K.C., with amplification of 60 decibels. The noise level is about 2.5 micro-volts when the input terminals are short-circuited. The pulse generater produces an output pulse of 500 volts with varible time durations from 2 to 33 micro-seconds. The instrument includes three kinds...

The present paper describes a portable and simple electronic circuit, which when incorporated with a pulse cathode ray oscillograph can be used in an ordinary seismic wave model experiment. The preamplifier has a pass band of 2—700 K.C., with amplification of 60 decibels. The noise level is about 2.5 micro-volts when the input terminals are short-circuited. The pulse generater produces an output pulse of 500 volts with varible time durations from 2 to 33 micro-seconds. The instrument includes three kinds of time scales with time intervals of 2, 10 and 50 micro-seconds respectively and the one with time interval of 2 μ.S. can be calibrated with a stable quarty oscillator installed inside the instrument.

本文討論了一套配合現成示波器进行地震波模型試驗用的电子线路。綫路的前置放大器的通頻带为2—700千周,增益为60分貝,輸入端短路噪声电压为2.5微伏.高压脉冲发生器产生一个寬度为2—33微秒的幅度为500伏的矩形电脉冲。时标电路产生2,10,50微秒三組吋标,基本吋标(2微秒)可由稳定的石英振蕩器随时加以校准。整个线路此較簡单、灵活,一般地球物理实驗室試制容易,且可根据具体要求加以变动。

 
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