全文获取类型
收费全文 | 167篇 |
免费 | 7篇 |
国内免费 | 19篇 |
专业分类
测绘学 | 7篇 |
大气科学 | 20篇 |
地球物理 | 39篇 |
地质学 | 71篇 |
海洋学 | 17篇 |
天文学 | 29篇 |
综合类 | 1篇 |
自然地理 | 9篇 |
出版年
2023年 | 2篇 |
2021年 | 7篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 10篇 |
2017年 | 9篇 |
2016年 | 9篇 |
2015年 | 9篇 |
2014年 | 9篇 |
2013年 | 10篇 |
2012年 | 9篇 |
2011年 | 16篇 |
2010年 | 16篇 |
2009年 | 10篇 |
2008年 | 12篇 |
2007年 | 18篇 |
2006年 | 10篇 |
2005年 | 2篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 5篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1988年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有193条查询结果,搜索用时 0 毫秒
191.
Determination of REE, Y, Nb, Zr, Hf, Ta, Th and U in Geological Reference Materials LSHC-1 and Amf-1 by Solution and Laser Ablation ICP-MS 总被引:1,自引:0,他引:1
Elena V. Smirnova Belinda Flem Elena A. Anchutina Irina N. Mysovskaya Valeriy I. Lozhkin Lev L. Petrov † 《Geostandards and Geoanalytical Research》2010,34(1):49-65
This paper presents data on REE and Y, Nb, Zr, Hf, Ta, Th and U abundances for two candidate reference materials (RMs), spinel lherzolite LSHC-1 and amphibole Amf-1, being currently developed at the Institute of Geochemistry SB RAS, Irkutsk. To determine the contents of these elements inductively coupled plasma-mass spectrometry was applied with: (i) solution nebulisation (solution ICP-MS) and (ii) laser ablation (LA-ICP-MS) of fused glass disks. The precision of results obtained by both techniques was better than 6% RSD for most elements. Accuracy was assessed by using the geochemical RMs JB-2, JGb-1 (GSJ) and MAG-1 (USGS). The trace element results by solution ICP-MS for JGb-1 and JB-2 agree with reference values presented by Imai et al. (1995, this Journal) within 1–10%. Significant differences were found for Nb and Ta determinations. The accuracy of LA-ICP-MS results evaluated by RM MAG-1 was within 4%, except for Eu (about 10%). The analytical results obtained for LSHC-1 and Amf-1 by solution ICP-MS and LA-ICP-MS were in good agreement with each other and with INAA and XRF data presented for the certification of these RMs. They can be considered as the indicative values for assigning certified values to the above-mentioned RMs. 相似文献
192.
Yuriy Elesin Taras Gerya Irina M. Artemieva Hans Thybo 《Arabian Journal of Geosciences》2010,3(4):477-497
We present a new 2D finite difference code, Samovar, for high-resolution numerical modeling of complex geodynamic processes.
Examples are collision of lithospheric plates (including mountain building and subduction) and lithosphere extension (including
formation of sedimentary basins, regions of extended crust, and rift zones). The code models deformation of the lithosphere
with viscoelastoplastic rheology, including erosion/sedimentation processes and formation of shear zones in areas of high
stresses. It also models steady-state and transient conductive and advective thermal processes including partial melting and
magma transport in the lithosphere. The thermal and mechanical parts of the code are tested for a series of physical problems
with analytical solutions. We apply the code to geodynamic modeling by examining numerically the processes of lithosphere
extension and basin formation. The results are directly applicable to the Basin and Range province, western USA, and demonstrate
the roles of crust–mantle coupling, preexisting weakness zones, and erosion rate on the evolutionary trends of extending continental
regions. Modeling of basin evolution indicates a critical role of syn-rift sedimentation on the basin depth and a governing
role of Peierls deformation in cold lithospheric mantle. While the former may increase basin depth by 50%, the latter limits
the depth of rift basins by preventing faulting in the subcrustal lithosphere. 相似文献
193.
Vladislav V. Izmodenov Yury G. Malama Alexandr P. Kalinin Mike Gruntman Rosine Lallement Irina P. Rodionova 《Astrophysics and Space Science》2000,274(1-2):71-76
Williams et al. (1997) have suggested that a population of hot hydrogen atoms is created in the heliosphere through elastic H-H collisions
between energetic `solar' atoms (neutralized solar wind) and interstellar atoms. They used a BGK-like approximation (Bhatnagar
et al., 1954) for the Boltzmann collision term and the collision cross sections suggested by Dalgarno (1960). We show that both
assumptions result in a significant overestimation of the the H-H collision effect. On the basis of calculated momentum transfer
cross-sections for elastic H-H collisions, we argue that elastic H-H and H-p collisions cannot produce hot H atoms in the
heliosphere.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献