全文获取类型
收费全文 | 2591篇 |
免费 | 173篇 |
国内免费 | 116篇 |
专业分类
测绘学 | 139篇 |
大气科学 | 145篇 |
地球物理 | 736篇 |
地质学 | 1360篇 |
海洋学 | 128篇 |
天文学 | 158篇 |
综合类 | 36篇 |
自然地理 | 178篇 |
出版年
2024年 | 6篇 |
2023年 | 16篇 |
2022年 | 96篇 |
2021年 | 109篇 |
2020年 | 122篇 |
2019年 | 111篇 |
2018年 | 247篇 |
2017年 | 207篇 |
2016年 | 268篇 |
2015年 | 141篇 |
2014年 | 256篇 |
2013年 | 277篇 |
2012年 | 148篇 |
2011年 | 153篇 |
2010年 | 94篇 |
2009年 | 104篇 |
2008年 | 82篇 |
2007年 | 55篇 |
2006年 | 71篇 |
2005年 | 34篇 |
2004年 | 37篇 |
2003年 | 31篇 |
2002年 | 26篇 |
2001年 | 25篇 |
2000年 | 18篇 |
1999年 | 8篇 |
1998年 | 16篇 |
1997年 | 9篇 |
1996年 | 6篇 |
1995年 | 7篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 8篇 |
1991年 | 4篇 |
1990年 | 9篇 |
1989年 | 5篇 |
1988年 | 6篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1985年 | 7篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1981年 | 3篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 5篇 |
排序方式: 共有2880条查询结果,搜索用时 421 毫秒
61.
Mohammad M. M. Alsahli Ahmed M. AlHasem 《Geografisk tidskrift / udgivet af Bestyrelsen for Det Kongelige danske geografiske selskab》2016,116(1):56-70
Assessing coastal vulnerability to sea level rise (SLR) at local and regional scales is a fundamental step for designing successful long-term coastal management plans. This study was thus designed to assess Kuwait coastal vulnerability to SLR at four scenarios (.5, 1, 1.5 and 2 m). Potential inundated areas and the number of people at risk were estimated based on these SLR scenarios. A coastal vulnerability index (CVI) map of Kuwait was then computed based on the lowest scenario using eight parameters: elevation, coastal slope, geomorphology, distance to 20-m isobath, population, land use, cultural heritage and transportation. The geographic distribution of inundated areas at an SLR of .5 m revealed that the northern islands of Kuwait and coastal areas along Kuwait Bay would be highly impacted, whereas the coastal area near Shuaibah Port was the most influenced among the southern coasts. Most of the coastal area exhibited a moderate vulnerability to SLR, especially the northern islands. This study presented an initial vulnerability assessment for Kuwait coasts to SLR, which can be extended with more variables. The integrated remote sensing and geographic information system methodology demonstrated in this study can be applied in similar studies elsewhere. 相似文献
62.
63.
Emad Zolqadr Seyed Shahaboddin Yasrobi Mohammad Norouz Olyaei 《Geomechanics and Geoengineering》2016,11(1):1-12
This study surveys the performance of temporary soil nail walls with a maximum height of 29.3 m in the Yas project, located in Tehran. Some numerical models, with various modelling approaches, were developed using finite element software and the proper modelling approaches were specified and verified.The modelling results were analysed and compared with the in situ monitored data. The results demonstrate the model’s horizontal deformations are generally greater than the in situ monitored values. To decrease the differences between models and monitored results, the effect of variations of the soil parameters had been surveyed and the limits of needed variations were specified. 相似文献
64.
65.
66.
67.
68.
69.
70.