全文获取类型
收费全文 | 799篇 |
免费 | 92篇 |
国内免费 | 54篇 |
专业分类
测绘学 | 263篇 |
大气科学 | 58篇 |
地球物理 | 213篇 |
地质学 | 100篇 |
海洋学 | 68篇 |
天文学 | 42篇 |
综合类 | 155篇 |
自然地理 | 46篇 |
出版年
2023年 | 1篇 |
2022年 | 11篇 |
2021年 | 24篇 |
2020年 | 43篇 |
2019年 | 41篇 |
2018年 | 20篇 |
2017年 | 44篇 |
2016年 | 46篇 |
2015年 | 47篇 |
2014年 | 39篇 |
2013年 | 48篇 |
2012年 | 56篇 |
2011年 | 58篇 |
2010年 | 41篇 |
2009年 | 54篇 |
2008年 | 40篇 |
2007年 | 56篇 |
2006年 | 34篇 |
2005年 | 34篇 |
2004年 | 28篇 |
2003年 | 35篇 |
2002年 | 12篇 |
2001年 | 19篇 |
2000年 | 22篇 |
1999年 | 16篇 |
1998年 | 10篇 |
1997年 | 7篇 |
1996年 | 8篇 |
1995年 | 8篇 |
1994年 | 7篇 |
1993年 | 5篇 |
1992年 | 2篇 |
1991年 | 6篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有945条查询结果,搜索用时 31 毫秒
241.
After Ms=6.5 Yao'an earthquake on January 15, 2000, a large amount of aftershock waveforms were recorded by the Near Source Digital Seismic Network (NSSN) installed by Earthquake Administration of Yunnan Province in the aftershock region. It provides profuse data to systematically analyze the features of Yao'an earthquake. The crustal anisotropy is realized by shear wave splitting propagating in the upper crust. Based on the accurate aftershock relocations, the shear wave splitting parameters are determined with the cross-correlation method, and the results of different stations and regions are discussed in this paper. These conclusions are obtained as follows: firstly, the average fast directions of aftershock region are controlled by the regional stress field and parallel to the maximum horizontal compressive stress direction; secondly, the average fast directions of disparate stations and regions are different and vary with the structural settings and regional stress fields; finally, delay time value is affected by all sorts of factors, which is affinitive with the shear wave propagating medium, especially. 相似文献
242.
lvaro Corral 《Tectonophysics》2006,424(3-4):177
The fulfillment of a scaling law for earthquake recurrence–time distributions is a clear indication of the importance of correlations in the structure of seismicity. In order to characterize these correlations we measure conditional recurrence–time and magnitude distributions for worldwide seismicity as well as for Southern California during stationary periods. Disregarding the spatial structure, we conclude that the relevant correlations in seismicity are those of the recurrence time with previous recurrence times and magnitudes; in the latter case, the conditional distribution verifies a scaling relation depending on the difference between the magnitudes of the two events defining the recurrence time. In contrast, with our present resolution, magnitude seems to be independent on the history contained in the seismic catalogs (except perhaps for Southern California for very short time scales, less than about 30 min for the magnitude ranges analyzed). 相似文献
243.
After Ms=6.5 Yao'an earthquake on January 15, 2000, a large amount of aftershock waveforms were recorded by the Near Source Digital Seismic Network (NSSN) installed by Earthquake Administration of Yunnan Province in the aftershock region. It provides profuse data to systematically analyze the features of Yao'an earthquake. The crustal anisotropy is realized by shear wave splitting propagating in the upper crust. Based on the accurate aftershock relocations, the shear wave splitting parameters are determined with the cross-correlation method, and the results of different stations and regions are discussed in this paper. These conclusions are obtained as follows:firstly, the average fast directions of aftershock region are controlled by the regional stress field and parallel to the maximum horizontal compressive stress direction; secondly, the average fast directions of disparate stations and regions are different and vary with the structural settings and regional stress fields; finally, delay time value is affected by all sorts of factors, which is affinitive with the shear wave propagating medium, especially. 相似文献
244.
Summary Fresnel volumes and interface Fresnel zones of transmitted and head waves are studied. The relation derived for transmitted waves may also be used for converted reflected waves. Considerable attention is devoted to the penetration of Fresnel volumes across structural interfaces, particularly for head waves. 相似文献
245.
The necessary condition for the seismic refraction method to succeed is that the refracted first arrivals from each layer in a multilayered earth system should be detected on a seismogram as first arrivals, and this is possible only when velocities of all underlying layers are successively greater. The usual procedure to interpret the refraction travel times is to fit such a data set with several intersecting straight lines by employing a visual technique which may lead to errors of subjective judgment, as the velocity model depends on the selection of various line segments through the data. To remove the visual fit we propose here a layer stripping method based on minimum intercept time, apparent velocity, rms residual, and maximum data points by least-squares fitting to yield several intersecting straight lines. Once data are segmented out, the conventional equations can be used to determine the velocity structure. 相似文献
246.
为了回避时延现象的存在给变结构控制方案中滑动模态的恰当定义及保证其渐近稳定的切换函数参数矩阵的确定带来的诸多不便和困难,对于线性时滞系统,首先根据帕德近似公式对其模型作近似处理,然后再采用变结构控制。该控制方案具有一定的应用价值。 相似文献
247.
Eleftheria E. Papadimitriou 《Natural Hazards》1994,9(3):303-321
Earthquake recurrence intervals for large and great shallow mainshocks in 12 seismogenic sources along the North Pacific seismic zone (Alaska-Aleutians-Kamchatka-Kuril Islands) have been estimated and used for the determination of the following relations:
相似文献
248.
用于JATC的GPS CV时间比对中的数据处理 总被引:2,自引:0,他引:2
GPS CV(共视)时间传递技术将在重建的我国的综合原子时(JATC)系统中起重要作用。介绍了GPSCV时间比对中共视数据的选取和消除观测数据中的随机噪声的方法,对GPS共视时间比对中的电离层时延改正和几何时延改正方法作了阐述,给出了对NTSC(中国科学院国家授时中心)与CRL(日本通信研究所,现已更名为国家信息和通信技术研究院(NICT))两个时间实验室之间的共视比对数据的计算结果。 相似文献
249.
静地卫星定轨的模糊度及基线选址 总被引:3,自引:2,他引:3
在短基线相位干涉法卫星定轨原理的基础上,分析了各主要误差源及其对相位模糊度计算的影响特性,指出目标卫星的初始轨道精度是影响模糊度解的主要因素;讨论了高稳定度的原子钟和共用本振方法以及近角距的较差观测对提高模糊度解的可靠性和精密定轨的积极作用。最后提出了综合有效率的概念,它可作为地面双基线布设及最优选址的参考依据。 相似文献
250.
|