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641.
波速测试在工程中的应用与研究 总被引:3,自引:0,他引:3
采用波速度原位测试新方法,依据新疆地区不同地层,不同岩性,结构波速变化规律对场土密度与波速的相关系数进行了分析研究,结果表明:新疆场地土剪切波速值与我国东部相比一般偏高40-80m/s,这可能与新疆气候干燥,场地土密度实状态高于我国东部有关。 相似文献
642.
本文指出了福建微震仪地震台网在地震速报和编目工作中存在的主要问题以及问题产生的可能原因;着重阐述了闽台两地区速度模型差异大是造成福建地震台网定位台湾地区震中误差的主原因;最后提出减少震中定位误差的改进办法。 相似文献
643.
分形理论在滑坡预报中的应用研究 总被引:2,自引:0,他引:2
以长江新滩滑坡和甘肃黄茨滑坡为研究对象,采用分形理论,初次提出滑坡动态位移分维、速度分维预测模型及滑坡大滑的分维预报式,为滑坡动态预报提供新的途径。 相似文献
644.
645.
I. B. Araú jo J.C.B. da Silva S. A. Ermakov I. S. Robinson 《Journal of Atmospheric & Ocean Science》2002,8(4):269-281
The relationship between internal wave (IW) signatures in Synthetic Aperture Radar (SAR) images and wind velocity is investigated. The effect of the wind velocity relative to the IW propagation direction on the IW signature is studied by means of a defined signature mode parameter ( S m ). S m is the parameter that quantifies the signature of the IW intensity profile in relation to the mean backscatter of the image background.
A wind contrast model based on a simple first-order Bragg scattering theory is combined with hydrodynamic modulation theory to explain the modulation of IW signatures. It takes into account the modulation of short-scale surface waves by the effect of the relative variations of wind velocity and the surface currents generated by the IWs.
It is shown that the signature mode parameter increases with the angle between the wind velocity and the IW propagation direction so that IWs propagating against the wind direction are imaged mostly as positive sign signatures, while those propagating in the wind direction are mostly negative sign signatures. 相似文献
A wind contrast model based on a simple first-order Bragg scattering theory is combined with hydrodynamic modulation theory to explain the modulation of IW signatures. It takes into account the modulation of short-scale surface waves by the effect of the relative variations of wind velocity and the surface currents generated by the IWs.
It is shown that the signature mode parameter increases with the angle between the wind velocity and the IW propagation direction so that IWs propagating against the wind direction are imaged mostly as positive sign signatures, while those propagating in the wind direction are mostly negative sign signatures. 相似文献
646.
The strongly deformed eclogites are well developed in ultra-high pressure jadeite-quartzite zone of the Dabie Mountains, Eastern
China, and garnets had been deformed strongly. Observations by transmission electron microscopy identified not only structure
of plastic deformation occurring as free dislocation, dislocation loops and dislocation walls, but also clusters of water
molecules present in the deformed garnet. Using infrared spectroscopy, two types of hydrous components are identified as the
hydroxyl and free-water in the garnet. Based on analysis of microstructure mechanism of deformation in garnets, and experimental
data of petrology, the clusters of water molecules were considered to lead strong plastic deformation of garnet by dislocations
because of mechanical weakening. 相似文献
647.
1 INTRODUCTION AND REVIEW Numerous investigations related to vertical velocity and suspension concentration distributions have been undertaken to the steady, uniform, open channel turbulent flow. The problems of sediment mixed water flows are of direct interest to the practical situations in the field of river sedimentation, coastalsediment transport and in the field of two-phase flow in particular. In hydraulic open channel flow, the vertical velocity profile is usually described by… 相似文献
648.
是否能够正确地建立深度域三维速度模型是三维叠前深度偏移成败的关键 .本文根据Deregowski循环 ,利用叠前深度域地震成像对速度模型变化的敏感性 ,采用偏移迭代逐次逼近最佳成像速度 ,研究开发了一套快捷有效的三维叠前深度偏移深度域速度模型建立技术 .借鉴时间域CDP(共深度点 )道集上常规叠加速度分析的策略 ,在深度域CRP(共反射点 )道集上 ,提出剩余慢度平方谱的概念并建立相应的实现技术 .导出深度域中均方根速度与层速度之间的关系 ;按照串级偏移原理确定偏移循环过程中初始速度、剩余速度及修改后速度之间的关系 ;采用蒙特卡洛非线性优化算法实现从剩余慢度平方谱中自动拾取层速度 ,讨论了其地质速度约束条件和蒙特卡洛非线性优化的收敛准则 ,使得所拾取的层速度模型具有合理的地质意义并获得最佳偏移成像效果 .SEG EAGE理论模型数值试算验证了方法的有效性 ,在海拉尔盆地霍多莫尔工区 ,5 8km2 三维资料的速度模型建立并获得满意的三维叠前深度偏移成像 . 相似文献
649.
The arrival at the Yellowknife Array (YKA) of closely-spaced P-waves having slightly different values ofdT/d, azimuth, and amplitude has been simulated using synthetic 1 Hz wavelets. Adaptive-processing determinations of apparent slowness and azimuth show a remarkable pattern of fluctuations with time for varying separations of the interfering pulses. In the critical separation range 0.30 to 0.55 s, these fluctuations greatly exceed the differences in arrival vectors of the primary wavelets themselves. Observation of characteristic interference patterns on real array seismograms might permit the identification of triplications associated with radial velocity anomalies in the lower mantle. Processed YKA seismograms for three events at distances close to 90° are presented, which, despite apparently simple P onsets illustrate the pattern of drift indT/d expected for such a triplication.Contribution from the Earth Physics Branch No. 648. 相似文献
650.
C. H. Sondergeld I. C. Getting H. A. Spetzler G. A. Sobolev 《Pure and Applied Geophysics》1980,118(2):975-989
Compressional and shear-wave velocities (V
p
andV
s
) were measured during the generalized triaxial deformation (i.e.
1
2=2
3) of pyrophyllite. Observed velocity changes could be ascribed to crack development during dilatancy. Velocity changes were very localized with respect to the ultimate failure plane. The orientation and development of the failure plane was continuously observed with laser holography. Velocity reverals, i.e. changes from a decreasing trend to an increasing trend, were documented in a wet sample in bothV
p
andV
s
. These changes in bothV
p
andV
p
are inconsistent with dialatancy-diffusion models. The reversals were interpreted as a reflection of local stress reorientation caused by a slowly propagating fault. 相似文献