全文获取类型
收费全文 | 302篇 |
免费 | 15篇 |
国内免费 | 6篇 |
专业分类
测绘学 | 32篇 |
大气科学 | 18篇 |
地球物理 | 115篇 |
地质学 | 84篇 |
海洋学 | 26篇 |
天文学 | 39篇 |
综合类 | 3篇 |
自然地理 | 6篇 |
出版年
2022年 | 1篇 |
2021年 | 4篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 14篇 |
2017年 | 18篇 |
2016年 | 17篇 |
2015年 | 15篇 |
2014年 | 14篇 |
2013年 | 18篇 |
2012年 | 17篇 |
2011年 | 15篇 |
2010年 | 11篇 |
2009年 | 14篇 |
2008年 | 18篇 |
2007年 | 14篇 |
2006年 | 11篇 |
2005年 | 10篇 |
2004年 | 5篇 |
2003年 | 9篇 |
2002年 | 7篇 |
2001年 | 8篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 6篇 |
1990年 | 3篇 |
1989年 | 7篇 |
1988年 | 2篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1974年 | 5篇 |
1973年 | 3篇 |
1972年 | 2篇 |
排序方式: 共有323条查询结果,搜索用时 15 毫秒
321.
Champati Anil Kanta Sheikh Janisar M. Patel Suresh Chandra Naik Ashutosh Behera Duryadhana 《International Journal of Earth Sciences》2017,106(7):2473-2474
International Journal of Earth Sciences - 相似文献
322.
Direct finite element method for nonlinear analysis of semi‐unbounded dam–water–foundation rock systems 下载免费PDF全文
A direct finite element method is presented for nonlinear earthquake analysis of interacting dam–water–foundation rock systems. The analysis procedure applies viscous damper absorbing boundaries to truncate the semi‐unbounded fluid and foundation‐rock domains and specifies at these boundaries effective earthquake forces determined from the design ground motion defined at a control point on the free surface. The analysis procedure is validated numerically by computing the frequency response functions and transient response of an idealized dam–water–foundation rock system and comparing with results from the substructure method. Because the analysis procedure is applicable to nonlinear systems, it allows for modeling of concrete cracking, as well as sliding and separation at construction joints, lift joints, and at concrete–rock interfaces. Implementation of the procedure is facilitated by commercial finite element software with nonlinear material models that permit modeling of viscous damper boundaries and specification of effective earthquake forces at these boundaries. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
323.
Sandeep Panda Anil Kumar Satyabrata Das Rahul Devrani Santosh Rai Kuldeep Prakash Pradeep Srivastava 《地球表面变化过程与地形》2020,45(11):2495-2511
This study explores paleoflood deposits of the Siang River, known as the Tsangpo in Tibet. The river that often experiences large floods brings down huge amount of sediment and water that adversely affect the downstream regions with large human populations in the states of northeast Himalaya and its foreland. Along it's ~300 km mountainous stretch we collected samples for sedimentological, petrographic and Sr–Nd isotopic study to explore sediment provenance and dated the paleofloods (via optically stimulated luminescence, OSL). Geomorphic indices including precipitation and a geomorphic swath profile across the Brahmaputra catchment were studied to understand the interplay of mountain relief and rainfall that determine potential zones of high erosion and sediment supply. The OSL technique indicated the Siang River experienced at least eight large floods between 7 and 1 ka, possibly under the influence of warm and wet climatic conditions. The petrographic and isotopic data suggests that the eastern Himalayan syntaxis, which has the highest uplift and exhumation rate in the area, is not always the highest sediment producing zone. In some instances, the Tibetan plateau produces higher fluxes of sediments via glacial and landslide lake outburst floods (GLOFs and LLOFs). © 2020 John Wiley & Sons, Ltd. 相似文献