全文获取类型
| 收费全文 | 19905篇 |
| 免费 | 2052篇 |
| 国内免费 | 2790篇 |
专业分类
| 测绘学 | 1200篇 |
| 大气科学 | 1683篇 |
| 地球物理 | 2424篇 |
| 地质学 | 6294篇 |
| 海洋学 | 1620篇 |
| 天文学 | 7569篇 |
| 综合类 | 921篇 |
| 自然地理 | 3036篇 |
出版年
| 2024年 | 55篇 |
| 2023年 | 175篇 |
| 2022年 | 492篇 |
| 2021年 | 539篇 |
| 2020年 | 583篇 |
| 2019年 | 685篇 |
| 2018年 | 520篇 |
| 2017年 | 591篇 |
| 2016年 | 602篇 |
| 2015年 | 659篇 |
| 2014年 | 955篇 |
| 2013年 | 1135篇 |
| 2012年 | 1004篇 |
| 2011年 | 1245篇 |
| 2010年 | 1140篇 |
| 2009年 | 1704篇 |
| 2008年 | 1556篇 |
| 2007年 | 1584篇 |
| 2006年 | 1465篇 |
| 2005年 | 1296篇 |
| 2004年 | 1123篇 |
| 2003年 | 941篇 |
| 2002年 | 763篇 |
| 2001年 | 646篇 |
| 2000年 | 585篇 |
| 1999年 | 584篇 |
| 1998年 | 493篇 |
| 1997年 | 243篇 |
| 1996年 | 237篇 |
| 1995年 | 187篇 |
| 1994年 | 184篇 |
| 1993年 | 169篇 |
| 1992年 | 104篇 |
| 1991年 | 86篇 |
| 1990年 | 80篇 |
| 1989年 | 55篇 |
| 1988年 | 59篇 |
| 1987年 | 33篇 |
| 1986年 | 34篇 |
| 1985年 | 34篇 |
| 1984年 | 27篇 |
| 1983年 | 16篇 |
| 1982年 | 20篇 |
| 1981年 | 7篇 |
| 1980年 | 12篇 |
| 1979年 | 6篇 |
| 1978年 | 6篇 |
| 1977年 | 17篇 |
| 1975年 | 2篇 |
| 1971年 | 2篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
141.
1 INTRODUCTIONThe South China Sea (SCS) is a semi-enclosedmarginal sea in western North Pacific Ocean withvery complex topography and is the important pas-sage connecting the Pacific and Indian Oceans. Ithas great impact to the global climate and a greatinterest of many oceanography researchers. Twodominant surface hydrographic and circulation fea-tures in the northern SCS are a strong fresh waterexpansion and a warm and high-salinity seawaterintrusion such as the SCS Diluted Water… 相似文献
142.
143.
Geophysical data from Gerlache Strait, Croker Passage, Bismarck Strait and the adjacent continental shelf reveal streamlined subglacial bedforms that were produced at the bed of the Antarctic Peninsula Ice Sheet (APIS) during the last glaciation. The spatial arrangement and orientation of these bedforms record the former drainage pattern and flow dynamics of an APIS outlet up‐flow, and feeding into, a palaeo‐ice stream in the Western Bransfield Basin. Evidence suggests that together, they represent a single ice‐flow system that drained the APIS during the last glaciation. The ice‐sheet outlet flowed north/northeastwards through Gerlache Strait and Croker Passage and converged with a second, more easterly ice‐flow tributary on the middle shelf to form the main palaeo‐ice stream. The dominance of drumlins with low elongation ratios suggests that ice‐sheet outlet draining through Gerlache Strait was comparatively slower than the main palaeo‐ice stream in the Western Bransfield Basin, although the low elongation ratios may also partly reflect the lack of sediment. Progressive elongation of drumlins further down‐flow indicates that the ice sheet accelerated through Croker Passage and the western tributary trough, and fed into the main zone of streaming flow in the Western Bransfield Basin. Topography would have exerted a strong control on the development of the palaeo‐ice stream system but subglacial geology may also have been significant given the transition from crystalline bedrock to sedimentary strata on the inner–mid‐shelf. In the broader context, the APIS was drained by a number of major fast‐flowing outlets through cross‐shelf troughs to the outer continental shelf during the last glaciation. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
144.
145.
146.
147.
148.
149.
150.