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earth media
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  地球介质
     RESEARCH OF THE ELECTRIC ANISOTROPY IN EARTH MEDIA
     地球介质电性各向异性研究
     In this paper, theory basis, genesis mechanism, criterion of the experiment with In-situ observation and application of the earth media electric anisotropy are stated.
     重点阐述了地球介质电性各向异性的理论基础、成因机制、实验及实测判据、应用等研究进展。
     Starting from discussing the complexity of the earth media and universality of heterogeneity,as well as the complication of seismic waves propagating in the media,this paper provides a brief historical retrospect on theory of seismic wave scattering and its methodological research,and briefly introduces and comments on some progress in this field since 1990s.
     本文从地球介质的复杂性与非均匀性的普遍性以及地震波在其中的传播过程的复杂性出发,对地震波散射理论及方法研究的历史进行了简要的回顾,并对该领域从20世纪90年代以来的某些进展作了简要的介绍与评述.
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     High-temperature /high-pressure rock mechanics (HTPRM) is a branch of rock mechanics. which targets the deformation behaviors and mechanisms of solid Earth media (materials) and, as compared with the ordinary rock mechanics, is characterized in its obJects by high temperature, high pressure, strong constraints, wide time domain, large deformation, solid-liquid interaction, and coexistence of physical and chemical effects, etc.
     高温高压岩石力学是岩石力学的分支学科,它以固体地球介质(材料)的变形行为和机制为研究对象,与一般变形固体力学相比较,具有高温、高压、强约束、宽时域、大变形、以及固-液相互作用、物理效应-化学效应并存等特点。
短句来源
     Authors indicate the research of the electric anisotropy in the earth media have important significance for research of the seismologic science.
     指出地球介质电性各向异性研究对推进地震科学研究具有重要意义。 关键词:地球介质;
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  “earth media”译为未确定词的双语例句
     2.5-D CSAMT MODELING WITH THE FINITE ELEMENT METHOD OVER 2-D COMPLEX EARTH MEDIA
     复杂介质有限元法2.5维可控源音频大地电磁法数值模拟
短句来源
     On Multi phase Tomography and Wavetype Ray Tracing in Earth media 
     多震相层析成像与在介质中的多波型射线跟踪
短句来源
     Elastic constructive relation of ainsotropic earth media
     地壳介质各向异性弹性本构关系讨论
短句来源
     Simulated image method for green's function of multi-layer earth media
     计算分层大地媒质中格林函数的模拟镜像方法
短句来源
     The medium described with modified Stokes viscoelastic wave equation is a Kelvin solid, which can be used to study the propagating of seismic wave in earth media.
     修改后的Stokes粘弹性波动方程所描述的介质相当于开尔芬体,可以利用它研究地震波在大地中的传播过程。
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  相似匹配句对
     Media
     媒体互动
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     MEDIA
     媒体话题
短句来源
     RESEARCH OF THE ELECTRIC ANISOTROPY IN EARTH MEDIA
     地球介质电性各向异性研究
     application of strain softening models for earth media;
     岩石介质的软化模型的应用;
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     Protect the Earth
     地球日到来之时谈保护地球母亲
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  earth media
A new numerical method is presented for propagating elastic waves in heterogeneous earth media, based on spectral approximations of the wavefield combined with domain decomposition techniques.
      
Meanwhile, the data of ground movement displacement and speed after the instrument effects are removed can be provided for the further studies on earth media and source physics of earthquake.
      


The paper includes two parts. The first part is a theoretical part, in which the characteristics of holography as applied to detection is discussed, and the notion of "detecting holography" is proposed. The principal difficulty encountered in applying elastic or electromagnetic waves to the earth media is the poor longitudinal resolution of monochromatic holography. Prom the viewpoint of the communication theory and the antenna array theory, the monochromatic holography is examined, and its relations to...

The paper includes two parts. The first part is a theoretical part, in which the characteristics of holography as applied to detection is discussed, and the notion of "detecting holography" is proposed. The principal difficulty encountered in applying elastic or electromagnetic waves to the earth media is the poor longitudinal resolution of monochromatic holography. Prom the viewpoint of the communication theory and the antenna array theory, the monochromatic holography is examined, and its relations to correlation detection, matched filters as well as phased array anteenas are illustrated. Multifrequency synthetic detective holography is developed as a possible approach to the solution of longitudinal resolution problem. Its principles are discussed, its relations to the "impulse holography" and the formulas for the longitudinal resolution are deduced. Finally, examples of two-dimensional computer simulation are presented to illustrate the feasibility of the method.The second part is an account of experiments made in water-tank for the microwave multifrequency synthetic detecting holography. The results of computer reconstruction using interference-type holograms give evidence to prove the high resolution and good imaging quality of the method.

本文分两个部分。第一部分从理论上探讨了全息成象应用于探测时的特点,提出了“全息探测成象”的概念。指出对地层介质使用弹性波或电磁波时,关键问题是纵向分辨力低。作者从信息论和天线阵理论的观点探讨了单频全息成象,研究全息成象和相关检测、匹配滤波以及相控阵之间的联系,提出了多频合成全息探测成象作为解决纵向分辨力的一个方法。探讨了它的原理,指出了它和“脉冲全息成象”的关系,导出了纵向分辨力公式,并给出了二维理论模型计算的结果,以说明方法的可行性和应用前景。 第二部分为实验部分,叙述了多频合成微波全息探测成象的试验。采用二维干涉型全息图做了简单模型的水槽试验,由计算机成象的结果证实了多频合成法的高分辨力和良好的成象质量。

The image reconstruction of complex geological structures using the seismic reflection data can't be carrid out by conventional time migration when the velocity is severely varied laterally and the big fault exists in the earth media. In this case, the depth migration must be used. But the existing depth migration techniques don't adapt to special geological conditions. The depth migration with higher-order approximation by time-shift algorithm eliminates the frequency dispersion and amplitude distortion...

The image reconstruction of complex geological structures using the seismic reflection data can't be carrid out by conventional time migration when the velocity is severely varied laterally and the big fault exists in the earth media. In this case, the depth migration must be used. But the existing depth migration techniques don't adapt to special geological conditions. The depth migration with higher-order approximation by time-shift algorithm eliminates the frequency dispersion and amplitude distortion in the calculation process. Image of the dip structure is based on the higher-order equation, and the correction of the refraction effect depends on the time shift algorithm. As a result, the problems of waveform distortion and energy loss presented in other depth migration methods have been solved. The tests demonstrate that our method can be used to image complex geological structures correctly with the lateral velocity variation ratio in two times, big fault with 3km throw and 60 degrees dip layer.

在速度横向剧烈变化且地质断层的断距甚大的复杂地球介质中要完成反射地震波的正确偏移成象,常规的时间偏移是无能为力的,这时,采用深度偏移方法。但是,已有的深度偏移技术对此特殊地质条件也不能得出满意的结果。本文使用高阶方程深度偏移方法,并且在计算中采用了一种与差分运算等价的时移法解决了计算中出现的频散和振幅失真问题。采用高阶方程是为了解决陡倾角地层的正确偏移复位,而折射效应的校正采用了时移法,从而解决了波形畸变和地震波能量损失问题。试验结果表明,本方法可以解决速度比值达2倍的横向突变和断距3km的断层、地层倾斜高达60°的复杂地质体的正确成象问题。

The paper gives a general review on the introduction,application and development of finite element and other numerical simulation methods in solid geophysics in China since the seventies.It contains sections on:numerical simulation of stress field and deformation field in structural geology;simulation on earthquake stress field and earthquake sequence,(in which a brief summary on the inversion of structural stress field is also mentioned);application of strain softening models for earth media;simulation...

The paper gives a general review on the introduction,application and development of finite element and other numerical simulation methods in solid geophysics in China since the seventies.It contains sections on:numerical simulation of stress field and deformation field in structural geology;simulation on earthquake stress field and earthquake sequence,(in which a brief summary on the inversion of structural stress field is also mentioned);application of strain softening models for earth media;simulation on temperature field and permeation field;numerical simulation on seismic wave propagation;numerical simulation of electric field and magnetic exploration.It can be seen that in the past twenty years,there is substantial development in the application of numerical simulation in China and many contributions have been made.In recent years,besides the finite element method,boundary element method has also been applied and developed.

主要综述70年代以来有限单元方法在我国地球科学中的引进、应用和发展.分为构造应力场和变形场的数值模拟;地震应力场及其迁移的模拟(这里对构造应力场的反演方案做了简要的阐述);岩石介质的软化模型的应用;温度场和渗流场的模拟;地震波传播的数值模拟;电场和磁法勘探中的数值模拟,以及其他方面的应用等部分.可以看出,这20年来我国地学应用中的数值模拟工作有了很大发展.除有限单元方法以外,近年来在边界元方法方面也有很多应用和较大发展.

 
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