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初至
first arrival
Automatic first arrival picking of GDZ24 seismometer GDZ24地震仪初至时间的自动拾取 短句来源 Improved accuracy of picking first arrival with wavelet transform in seismic survey 利用小波变换提高地震波初至拾取的精确度 短句来源 New Method for Weak First Arrival Picking from Full Sonic Waveform 声波测井资料弱初至波检测新方法 短句来源 Seismic first arrival pickup using artificial neural network 利用人工神经网络自动拾取地震记录初至 短句来源 AUTOMATIC PICKING OF THE SEISMIC FIRST ARRIVAL 折射初至同相轴自动拾取 短句来源 更多 first break
Tomographic inversion of first break in surface model 初至波表层模型层析反演 短句来源 Study of first break Tomographic inversion method for static corrections. 初至波层析反演静校正方法研究 短句来源 SEISMIC FIRST BREAK PICKUP USING WAVELET TRANSFORM AND POWER RATIO METHOD 用小波变换与能量比方法联合拾取初至波 短句来源 An automatic method to pick up the first break time 一种实现初至波自动拾取的方法 短句来源 To improve the inversion accuracy of velocity model,the various first break times from direct,reflection and refraction waves are considered for determining the observed traveltimes and the theoretical model calculation. 分析了复杂的近地表低降速带模型初至波的性质 ,在观测值的自动拾取以及理论值的计算中充分考虑了可能成为初至波的直达波、折射波和反射波的利用 ,提高了低降速带速度模型反演的精度 . 短句来源 更多 first arrivals
A WAVELET TRANSFORM AND BP NEURAL NETWORK-BASED ALGORITHM FOR DETECTING FIRST ARRIVALS ON SEISMIC WAVES 基于小波变换和BP神经网络的地震波初至拾取方法 短句来源 An improved algorithm for picking up seismic first arrivals by using fractal dimension. 利用分形维拾取地震波初至的一种改进算法 短句来源 THE APPLICATION OF THE COMMON OFFSET FIRST ARRIVAL CURVE COMBINED WITH COMMON-SOUCE-LOCATION BASIS TO PICKING FIRST ARRIVALS OF SEISMIC WAVE 用共偏移距初至曲线联动共炮点道集拾取地震波初至 短句来源 Study On Fractal-based For Picking First Arrivals On Seismic Traces 基于分形维地震道初至拾取方法研究 短句来源 The Contrast and Study of First Arrivals Detecting on Seismic Record 地震记录初至拾取方法对比和研究 短句来源 更多 first breaks
Method of automatic first breaks pick-up based on edge detection. 基于边缘检测的初至波自动拾取方法 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 Static Correction by Fitting First Breaks of Direct Waves Using Polynomial 利用多项式拟合单炮初至作地表静校正 短句来源 Static corrections by first breaks tomographic inversion in complex area 复杂区初至层析反演静校正 短句来源 THE IMPROVED BP NEURAL NETWORK AND ITS APPLICATION IN SEISMIC FIRST BREAKS PICKING BP神经网络的改进及其在初至波拾取中的应用 短句来源 更多 
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By examining the slopes of the first arrival time plotted versus depth or the depth where the amplitude of the first arrival significantly decreases, the length of the pile can be determined.
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Traveltime tomography is a technique to reconstruct acoustic, seismic, or electromagnetic wave-speed distributions from first arrival traveltime data.
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This paper introduces a practical case of using the seismic CT method for detecting the structure of the rocks for tunnel engineering and to utilize SIRT algorithms for doing first arrival time iterative inversion.
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Optimal models for the first arrival time distribution function in continuous time - With a special case
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Optimal Models for first arrival time (τH) and first arrival target total return (WH) distribution functions on MDP in continuous time are presented.
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To the most of velocity fields, the traveltimes of the first break that seismic waves propagate along rays can be computed on a 2-D or 3-D numerical grid by finite-difference extrapolation.
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In TTAB?+?HTAB mixtures, the first break is called the critical aggregation concentration.
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The mixing behavior of TTAB?+? HTAB corresponding to the first break, and that of TTAB?+?DTAB mixtures in the presence of PVP, is close to ideal and is also identical to that in pure water.
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The first break, c1,M, was due to mixed-micelle formation, whereas the second one, c2,M, was due to the structural micellar transitions in the mixed micelles formed during the first break.
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The quantitative analysis of the mixed-micelle formation corresponding to the first break was carried out with the help of regular solution and Motomura's approximations.
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The phase relations between the first arrivals of compressional and shear waves, and their signification to full wave logging
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This conclusion is based on the shadow zone for refractions on the travel time curves in their first arrivals from the M discontinuity.
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As initial material the data on first arrivals of P-waves are used.
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In order to attempt to provide additional information on the depth configuration of the attenuating material, the ray paths of P-wave's first arrivals are located in three-dimensional space.
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Travel-time analysis of seismic first arrivals and infrasonic waves indicates that explosions start with a seismic event at a shallow depth (>amp;lt;200?m), followed ～1?s later by an out-flux of gas, ash and solid material through the vent.
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The majority of the countries, including most of the slowdown countries, exhibit faster growth after their second breaks than during the decades preceding their first breaks.
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The point along the fission pathway of a photoexcited p-state bubble, where the adiabatic approximation first breaks down, occurs well before the bubble waist has pinched down forming two cavities.
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This set first breaks down into a large number of well separated clusters.
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In explosion seismology, Snell's law may apply to the arrival times of the 'first breaks', but not to those of the seismic 'reflections'.
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For compressional waves following vertical ray paths, the velocity depth profile can be read directly from the first breaks of the near offset VSP.
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其他
The paper cites numerous records of cold and arid weather in historical documents,shows the character-istics of extremely cold and dry palaeoclimate in the second cold period in China during the beginning of A.D.to 600 A.D.and discusses the effects of changes of palaeoclimate on water volume of the Yellow Riverby taking the close corresponding relationship between palaeoclimate in the second cold period and watervolume of Hukou on the Yellow River as an example.It considers through the analysis that the Yel... 本文列举历史文献中大量寒冷、干旱的记载,说明了公元初～公元600年中国第二寒冷期古气候极为寒冷干旱的特点,并以第二寒冷期古气候与黄河壶口水量的密切对应关系为例,探讨了古气候变化对黄河水量的影响。通过分析认为,公元初至5世纪的干旱寒冷期内,黄河水量相应减少,最大减少幅度达250亿m~3。 文摘来源 s:The calculation of first-arrival traveltime with finite difference is an efficient method. It also,as compared with conventional ray methods, has no difficulties in Caustics and shadow zones.In this paper,we Point out the main drawbacks in Van Trier's method, and construct a new upwind difference scheme. Numerical experiments show that our method is efficient and feasible. Even for medium with large contrast,discontinuous velocity distribution,we could also obtain the accurate solutions. 有限差分法初至波走时计算是一种十分快速、有效及实用的方法，而且不会碰到传统射线法的阴影区、焦散面等问题．文中指出了ＶａｎＴｒｉｅｒ方法存在的问题，并提出了解决的办法．计算结果表明，方法是有效可行的．对速度变化很大的介质模型，仍能得到较精确的解． 文摘来源 new method of first arrival picking is proposed on the basis of the amplitude envelope for full sonic waveform. The method uses the changes of energy ratio between the long window and the short window to pick first arrivals. For the multilayer cased borehole and the circumferential sonic waveform in fractured formations. the results processed show that this method is very efficient for picking weak first arrivis. 提出一种基于对波形包络信号进行统计分析的初至波检测新方法．该方法利用信号道大、小时窗内波形包络能量的比值变化来检测初至信号．实际资料试处理结果表明，对多层套管井全波资料和裂缝地层环行声波资料进行处理时，取０．２～０．４倍脉冲极值作为门槛值可检测到各种弱初至波。 文摘来源 << 更多相关文摘 
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