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the mantle
相关语句
  地幔
    ANALYSIS OF THE THERMODYNAMIC UNSTABILITY IN THE MANTLE
    地幔热力不稳定性分析
短句来源
    Seismic anisotropy in the mantle transition zone beneath Fiji-Tonga
    斐济—汤加地幔过渡带的地震波各向异性
短句来源
    STUDY ON THE MANTLE ANISOTROPY IN CHINA MAINLAND BY USING SHEAR WAVE SPLIT
    利用剪切波分裂研究中国大陆上地幔各向异性
    We use the seismic tomograpy model SH12WM13 to calculate the mantle convection patterns with different Rayleigh numbers up to 10 6. Results show that the mantle convection patterns depend on not only the seismic tomography data, but also the Rayleigh numbers very much.
    本文在利用地震层析成像数据计算地幔对流模型的新理论和方法的基础上 ,用SH12WM13地震层析成像模型数据 ,计算了全球地幔对流格局 .
短句来源
    HIGH TEMPERATURE PLASTICITY OF GARNETS:RHEOLOGY OF THE MANTLE TRANSITION ZONE
    石榴子石的高温塑性:地幔转换带的流变特性
短句来源
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  了地幔
    First, the higher creep strcngth of garnets determines the flow strength of the mantle transition zone;
    首先,石榴子石相矿物在很大程度上决定了那里的强度结构,并控制了地幔转换带的流变性。
短句来源
    Based on the thermodynamic models of the mantle, the thermodynamic unstability conditions and critical conditions of the mantle under the influence of numerous factors are analysed. Results show, among the factors influencing the mantle's motion, thermal effect in the mantle such as radiogenic heat, factes-change heat and adiabatic heat may increase the force driving the mantle, whereas rotation effect of the earth may decrease the critical resistance.
    根据地幔热动力学模型,分析了地幔在多种因素(特别是地球自转效应)影响下的热力不稳定性条件和临界条件,结果表明,地质年代在影响地幔热力不稳定性的诸因素中,地幔内部的热源(放射性生热、相变生热、绝热压缩生热和底部加热)效应能够使地幔lavleish数增大,即增大地幔运动的动力;
短句来源
    We review the results of experiments on high pressure phase changes of the mantle and the latter′s mineral composition.
    较系统地介绍了地幔矿物的高压相变实验结果和地幔的矿物组成.
短句来源
    The structures beneath the area around Bohai Bay and its neighboring indicate that the mantle asthenosphere in eastern China is shallow,thick and with low velocity values,which illustrates the character of up-welling mantle.
    环渤海地区及相关区域多个台站的速度结构显示,华北东部地区地幔软流层埋深浅、厚度大、速度低,反映了地幔上涌的特点;
短句来源
  “the mantle”译为未确定词的双语例句
    2) representative of the Early Mesozoic mafic ultramafic cumulates (241~214 Ma) They are products of direct addition of the mantle substance to the lowermost continental crust by mafic magmatic underplating, which results in the vertical accretion of the lower continental crust in Da Hinggan Mts in the Early Mesozoic
    2)早中生代形成的镁铁-超镁铁质堆晶岩(241~214 Ma)对下部陆壳的增生。
短句来源
    The CO_2 concentrations of the geothermal gases is higher than 96%, and the δ~(13)C values of CO_2 range from -4.43‰ to -5.5‰ indicate that the CO_2 come from the mantle.
    研究结果表明:横迳地区温泉气中CO2的含量很高较重(-4 43‰~-5 50‰),属幔源CO2;
短句来源
    The helium isotopic ratios ~3 He/ ~4 He for the hot spring gases changing from 1.36Ra to 2.11Ra suggest that the mantle helium input may exist in the geothermal system of the study area.
    He同位素特征值(R/Ra)变(>96%),δ13CCO2化于1 36~2 11之间,均大于l,有幔源He的加入;
短句来源
    Teleseismic P waveform contains much information about the Ps converted wave and its multiples from discontinuities in the crust and the mantle, which can be used to acquire the average thickness and the Poisson's ratio of the crust by the H_k stacking method.
    利用远震P波波形记录中包含的壳-幔速度间断面的Ps转换波及其多次反射转换波信息,采用在地壳厚度-波速比平面上对接收函数转换波能量的叠加搜索方法,可以测定台站下方区域内地壳的平均厚度和泊松比.
短句来源
    Moreover,there are possibly different temperature gas fields in depth. The CH_4/~3He ratios vary from 2.38×10~7 to 5.3×10~8,considerably greater than 5×10~(6) for the mantle,indicating that CH_4 is not mantle origin.
    CH4/3He比率为2.38×107~5.3×108,大于幔源CH4的表征值5×106,说明横迳地区温泉气体的CH4是非幔源成因;
短句来源
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  the mantle
The mantle upwelling originates from the core-mantle boundary and mostly occurs in the middle mantle and the lower part of the upper mantle.
      
The mantle flow has an effect on controlling the movement of plates and the distributions of ocean ridges, subduction zones and collision zones.
      
The mantle upwelling regions are clearly related with the locations of hotspots on the earth's surface.
      
As the volcanism prograded to the northwest, the depth of fault penetration into the mantle changed.
      
In Peter the Great Bay, Sea of Japan, this species repeatedly reproduces during the entire spring-autumn period; externae with developing embryos in the mantle cavity occur from May to September, and planktonic larvae occur from June to October.
      
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The longitudinal effects and UT variations of the geomagnetic Sq field have been analysed on the basis of the magnetic data from the world station network during IGY/C(1957.7-1959.12).The data at 4 observatories in China are included in analysis. A new scheme has been proposed for analysing Sq field which combines the Spheric harmonic analysis and biharmonic analysis. The Sq field has been separated into 3 parts: SLT dependent on local time LT alone, SUT on universal time UT alone, and SLUT on both LT...

The longitudinal effects and UT variations of the geomagnetic Sq field have been analysed on the basis of the magnetic data from the world station network during IGY/C(1957.7-1959.12).The data at 4 observatories in China are included in analysis. A new scheme has been proposed for analysing Sq field which combines the Spheric harmonic analysis and biharmonic analysis. The Sq field has been separated into 3 parts: SLT dependent on local time LT alone, SUT on universal time UT alone, and SLUT on both LT and UT.In globle scale, the ratios of the intensities of the three parts are 1.0:0.2:0.3 for X component, 1.0:0.1:0.6 for Y component,1.0:0.4:1.0 for Z Component. The longitudinal effects of the Sq field and its UT variations have different forms,although they show the same phenomenon.The longitudinal effects and UT variations of the Sq field are attributed to the tilt of the geomagnetic axis,non-diple fields in the earth's magnetic field(regional anomalies),and lateral inhomogeneous conductivities in the crust and the mantle.

使用国际地球物理年(IGY)和国际地球物理合作年(IGC)期间全球地磁台网的资料和中国台站的同期地磁记录,对地磁场太阳日变化Sq的经度效应和UT变化进行了分析研究.将适用于瞬时全球磁场的球谐分析法与适用于平均场的双调和分析法相结合,提出了一种分析Sq磁场的新方案,得到了(θ,T,t)坐标系中组成Sq场的三个部分,即仅随地方时LT变化的部分SLT,仅随世界时UT变化的部分SUT以及既随LT变化又随UT变化的部分SLUT.从全球来看,在IGY/IGC期间,这三部分的强度之比分别为:X分量1.0:0.2:0.3,y分量1.0:0.1:0.6,Z分量1.0:0.4:1.0.Sq的经度效应和UT变化虽然表现了同一物理过程,但它们有不同的表达形式,其决定因素是地磁轴对地理轴的倾斜,地磁场的非偶极子成分(即区域性异常)和地球内部电性的横向不均匀性(包括海陆分布、地壳上地幔电导率的区域差异)

This paper systematically expound the main achievement of the lithosperic physics and dynamics study in China.According to the seismic study of the crust,upper mantle sturcture,we emphatically discuss the orogenic belts sedimentary basin,rift seismic activities,continental margin tectonic patterns of the zones with special lithospheric structure background and their deep internal processes.The combined application of seismic refraction and wide angle reflection methods,prospection of vertical seismic reflection...

This paper systematically expound the main achievement of the lithosperic physics and dynamics study in China.According to the seismic study of the crust,upper mantle sturcture,we emphatically discuss the orogenic belts sedimentary basin,rift seismic activities,continental margin tectonic patterns of the zones with special lithospheric structure background and their deep internal processes.The combined application of seismic refraction and wide angle reflection methods,prospection of vertical seismic reflection method developed in recent years,seismic tomography technology,3-D velocity structure of seismic surface wave,physical modeling and unmerical modeling technology,the application of wave form inversion and joint inversion have deepened the recognition of the lithosphere.We have not only got all-side recognition of the crust-mantle structure in China continent,but also got many achievement on the low velocity layer and high velocity imbedded layer in the crust and the mantle,crust-mantle mixtrue,the occurrence of faults and the structure and character of Mohorovicic discontinuity.The seismic wave propgation in vertical isotropic media and transverse anisotropic media,the wave theory,the test method and technology of seismic wave in 2-D and 3-D anisotropic media,the development and new trails of geophysical inversion theory,method and experimental study will put the lithospheric physics and dynamics study into a new condition.This paper present the prospect of the field and the task in the furture,

本文系统阐述了中国在岩石层物理和动力学研究中的主要成就.在详细论述地壳、上地幔结构的地震学研究基础上,着重论述了造山带、沉积盆地、裂谷、地震活动、陆缘和岩石层特异构造背景地区的构造格局及其深层过程.地震折射波法和宽角反射波法的联合应用,近年来发展的垂直反射波法的探测,地震层析成像技术,地震面波的三维速度结构,物理模拟和数字模拟技术与波形反演、联合反演的应用,深化了对岩石层本体的认识.不但对中国大陆的壳幔结构有了全面了解,而且对壳、幔低速层、高速夹层,壳-幔混合物,断裂产状和莫霍界面结构与性质的研究,取得了重大进展.地震波在纵向各向同性、横向各向异性介质中的传播,地震波在二维与三维各向异性介质中的波动理论和检测方法与技术,地球物理反演理论与方法和实验研究等的全面发展和创新,将会使岩石层物理与动力学的研究步入一个新的境地.本文最后提出了在该领域中的发展前景和今后的任务.

Based on the comprehensive studies of the global sesmicity and active tectonics, the global seismotectonics is summarized with three great systems:(1)the circum-Pacific seismotectonicsystem of deep subduction(the P system);(2)the Atlantic seismotectonic system of mid-oceanic ridge rifts(the A system );and(3)the continental seismotectonic system of shear nets(the C system).There is important dynamic correlation between the distribution of these three systems on the earth’s surface and the deflection of the geoid...

Based on the comprehensive studies of the global sesmicity and active tectonics, the global seismotectonics is summarized with three great systems:(1)the circum-Pacific seismotectonicsystem of deep subduction(the P system);(2)the Atlantic seismotectonic system of mid-oceanic ridge rifts(the A system );and(3)the continental seismotectonic system of shear nets(the C system).There is important dynamic correlation between the distribution of these three systems on the earth’s surface and the deflection of the geoid relative to the ideal roatating ellipsoid.Comparative analyses are made for the three systems by using the data of tectonic deformation and earthquake mechanism. The A system is characterized by planar extensional fractures. The P system demonstraces obduction and overthrusting of the Atlantic(0°)hemisphere lithosphere to the Pacific(180°)hemisphere lithosphere. The A system representsdilatation of the south hemisphere ,while the C system indicates contraction of the northhemisphere. The relationship between the circum-antarctic oceanic ridge and the C system isprobably assoriated with the longitudinal flow of the mantle.

据全球地震活动和活动构造的综合研究,全球地震构造可归总为3个大系统:(1)环太平洋深俯冲地震构造系(P系);(2)以大西洋为代表的大洋中脊裂谷地震构造系(A系);(3)大陆剪切网络地震构造系(C系)。这3个系统与大地水准面相对于理想旋转椭球面的畸变之间有重要的动力学联系。用构造变形和地震机制资料对3大系统作对比分析。A系以面状伸展破裂为特征,P系与大西洋(0°)半球岩石圈相对于太平洋(180°)半球岩石圈的反俯冲或逆冲有密切关系。A系总体反映了南半球的膨胀,而C系代表了北半球的收缩,环南极洋脊和C系的相互关系可能与径向对流有关。

 
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