全文获取类型
收费全文 | 751篇 |
免费 | 29篇 |
国内免费 | 12篇 |
专业分类
测绘学 | 16篇 |
大气科学 | 79篇 |
地球物理 | 198篇 |
地质学 | 286篇 |
海洋学 | 85篇 |
天文学 | 94篇 |
综合类 | 4篇 |
自然地理 | 30篇 |
出版年
2024年 | 2篇 |
2023年 | 5篇 |
2022年 | 26篇 |
2021年 | 19篇 |
2020年 | 30篇 |
2019年 | 25篇 |
2018年 | 29篇 |
2017年 | 25篇 |
2016年 | 42篇 |
2015年 | 28篇 |
2014年 | 40篇 |
2013年 | 49篇 |
2012年 | 44篇 |
2011年 | 56篇 |
2010年 | 37篇 |
2009年 | 46篇 |
2008年 | 37篇 |
2007年 | 28篇 |
2006年 | 31篇 |
2005年 | 21篇 |
2004年 | 28篇 |
2003年 | 17篇 |
2002年 | 20篇 |
2001年 | 21篇 |
2000年 | 7篇 |
1999年 | 6篇 |
1998年 | 8篇 |
1997年 | 8篇 |
1996年 | 6篇 |
1995年 | 11篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1986年 | 3篇 |
1985年 | 7篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有792条查询结果,搜索用时 15 毫秒
791.
F. A. Temporim Ricardo Ivan Ferreirae da Trindade Marcos Egydio-Silva Tiago Valim Angelo Eric Tohver Caroline Cibele Soares Lucas Pequeno Gouvêa Julio Cesar Mendes Silvia Regina Medeiros Antônio Carlos Pedrosa-Soares Gabriel Gomes Silva 《地学学报》2023,35(1):23-31
Featuring 3 000-km-long large and hot orogen, the Mantiqueira Province provides a rare opportunity to study the process of gravitational collapse at mid to deep crustal levels. Distinct but contemporary (~500 Ma) post-collisional intrusions show structures and anisotropy of magnetic susceptibility (AMS) fabrics related to their emplacements, recording different flow patterns. In southern deep-seated intrusions, ellipsoidal-shaped roots with gabbroic-to-hybrid cores surrounded by granitic rocks show concentric patterns of AMS fabrics that cut across the NE-trending regional foliation. In contrast, northern intrusions, exposed as the upper sections of batholith-size bodies of coarse-grained granite emplaced at the shallow to mid-crust, show general NS-trending magnetic fabrics roughly parallel to strike of the orogen and the regional foliation of host rocks. These contrasting magnetic patterns from shallow to deeper crust suggest vertical magma migration from the overthickened orogenic core to be emplaced across its thinner stretched flanks during the gravitational collapse of the orogenic edifice. 相似文献
792.
Camila Rodrigues Costa Cynthia Fernandes Pinto da Luz Ingrid Horák-Terra Plínio Barbosa de Camargo Uidemar Morais Barral Carlos Victor Mendonça-Filho Thamyres Sabrina Gonçalves Alexandre Christófaro Silva 《第四纪科学杂志》2023,38(1):61-75
The Cerrado biome is the second largest in Brazil, but the evolution of the Cerrado during the late Quaternary is not yet fully known. This study identifies paleoenvironmental changes during the last 23 000 years, based on a tropical mountain peatland record, in the Serra do Espinhaço Meridional in central-eastern Brazil. A multi-proxy approach was used that involved palynological analysis, stable isotopes (δ13C, δ15N), geochemistry, radiocarbon dating and multivariate statistics derived from a peatland core from Rio Preto (Minas Gerais state). The study reveals a very humid and cold climate during the late Pleistocene, with an increase in temperature and decrease in humidity at the Pleistocene–Holocene transition. During this period there was strong instability in the landscape (episodes of erosion). At the beginning of the Holocene there was a reduction in humidity with greater landscape stability. The current sub-humid climatic conditions seem to have been established in the mid-/late Holocene, with periods of landscape instability. Our findings agree with other Cerrado records that contradict previously established hypotheses, such as the Amazonian Refuge and the Pleistocene Arc. 相似文献