全文获取类型
收费全文 | 4021篇 |
免费 | 373篇 |
国内免费 | 397篇 |
专业分类
测绘学 | 1237篇 |
大气科学 | 495篇 |
地球物理 | 301篇 |
地质学 | 893篇 |
海洋学 | 647篇 |
天文学 | 26篇 |
综合类 | 424篇 |
自然地理 | 768篇 |
出版年
2024年 | 17篇 |
2023年 | 59篇 |
2022年 | 149篇 |
2021年 | 178篇 |
2020年 | 182篇 |
2019年 | 251篇 |
2018年 | 125篇 |
2017年 | 243篇 |
2016年 | 219篇 |
2015年 | 238篇 |
2014年 | 262篇 |
2013年 | 281篇 |
2012年 | 317篇 |
2011年 | 288篇 |
2010年 | 213篇 |
2009年 | 183篇 |
2008年 | 211篇 |
2007年 | 194篇 |
2006年 | 195篇 |
2005年 | 137篇 |
2004年 | 134篇 |
2003年 | 106篇 |
2002年 | 102篇 |
2001年 | 76篇 |
2000年 | 62篇 |
1999年 | 53篇 |
1998年 | 49篇 |
1997年 | 50篇 |
1996年 | 53篇 |
1995年 | 31篇 |
1994年 | 31篇 |
1993年 | 27篇 |
1992年 | 16篇 |
1991年 | 17篇 |
1990年 | 7篇 |
1989年 | 8篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有4791条查询结果,搜索用时 15 毫秒
191.
192.
193.
194.
195.
196.
Equilibrium erosion of soft rock shores with a shallow or absent beach under increased sea level rise 总被引:1,自引:0,他引:1
A process-based numerical model was used to explore the response of soft rock shores with low volume beaches to variable rates of sea level rise. Equilibrium recession rates were simulated for ranges of wave height and period, tidal amplitude, rock strength, beach volume and rate of sea level rise. Equilibrium shore profiles were found to be steeper with higher rates of sea level rise. Beaches were represented as protective surfaces yet were found to cause no significant reduction in equilibrium recession rate when their volumes were below a critical threshold. Reduced equilibrium recession rates were found with beaches that extended sufficiently far below low tide level. The model results imply that, given several constraints, a very simple relationship exists between increased rates of sea level rise and the response of eroding composite soft rock/low volume beach shores. 相似文献
197.
广西合浦海草床生态系统服务功能价值评估 总被引:3,自引:0,他引:3
海草床生态系统是生物多样性丰富和生产力高的近岸海洋生态系统,本文以广西合浦海草床为例,结合实地调查、已有的研究成果和当地统计资料,综合运用生态经济学、资源经济学等基本理论和方法,对该地区海草生态系统的服务功能进行了价值评估。结果表明2005年该地区海草生态系统的服务功能价值为6.29×105元/a·ha,其中间接利用价值最大,为4.47×105元/a·ha,占总经济价值的70.97%;其次为非利用价值,为1.54x105元/a·ha,占总经济价值的24.52%;最少的是直接利用价值为2.84×104元/a·ha,仅占总经济价值的4.51%。 相似文献
198.
探讨GIS开源技术在基础地理信息数据库浏览与查询中的应用,以福建省基础地理信息中心的基础地理信息数据库浏览系统为例,应用openlayers脚本库等开源技术实现对切片地图的输出和查询,实现了在内部局域网内对基础地理数据库的浏览与查询的功能,从而提高了对基础地理信息数据库的应用水平及使用效率。 相似文献
199.
Corrosion and fatigue cracks are major threats to the structural integrity of aging offshore platforms. For the rational estimation of the safety levels of aging platforms, a global reliability assessment approach for aging offshore platforms with corrosion and fatigue cracks is presented in this paper. The base shear capacity is taken as the global ultimate strength of the offshore platforms. It is modeled as a random process that decreases with time in the presence of corrosion and fatigue crack propagati... 相似文献
200.
The offshore jacket platform is a complex and time-varying nonlinear system,which can be excited of harmful vibration by external loads.It is difficult to obtain an ideal control performance for passive control methods or traditional active control methods based on accurate mathematic model.In this paper,an adaptive inverse control method is proposed on the basis of novel rough neural networks (RNN) to control the harmful vibration of the offshore jacket platform,and the offshore jacket platform model is established by dynamic stiffness matrix (DSM) method.Benefited from the nonlinear processing ability of the neural networks and data interpretation ability of the rough set theory,RNN is utilized to identify the predictive inverse model of the offshore jacket platform system.Then the identified model is used as the adaptive predictive inverse controller to control the harmful vibration caused by wave and wind loads,and to deal with the delay problem caused by signal transmission in the control process.The numerical results show that the constructed novel RNN has advantages such as clear structure,fast training speed and strong error-tolerance ability,and the proposed method based on RNN can effectively control the harmfid vibration of the offshore jacket platform. 相似文献