全文获取类型
收费全文 | 16304篇 |
免费 | 2290篇 |
国内免费 | 2868篇 |
专业分类
测绘学 | 3384篇 |
大气科学 | 2377篇 |
地球物理 | 2622篇 |
地质学 | 6544篇 |
海洋学 | 1823篇 |
天文学 | 1012篇 |
综合类 | 1328篇 |
自然地理 | 2372篇 |
出版年
2024年 | 65篇 |
2023年 | 205篇 |
2022年 | 397篇 |
2021年 | 503篇 |
2020年 | 524篇 |
2019年 | 619篇 |
2018年 | 437篇 |
2017年 | 593篇 |
2016年 | 562篇 |
2015年 | 675篇 |
2014年 | 831篇 |
2013年 | 835篇 |
2012年 | 934篇 |
2011年 | 1069篇 |
2010年 | 889篇 |
2009年 | 963篇 |
2008年 | 1001篇 |
2007年 | 1156篇 |
2006年 | 1088篇 |
2005年 | 1024篇 |
2004年 | 958篇 |
2003年 | 807篇 |
2002年 | 797篇 |
2001年 | 611篇 |
2000年 | 602篇 |
1999年 | 503篇 |
1998年 | 498篇 |
1997年 | 416篇 |
1996年 | 395篇 |
1995年 | 330篇 |
1994年 | 310篇 |
1993年 | 212篇 |
1992年 | 169篇 |
1991年 | 123篇 |
1990年 | 98篇 |
1989年 | 89篇 |
1988年 | 55篇 |
1987年 | 51篇 |
1986年 | 22篇 |
1985年 | 12篇 |
1984年 | 9篇 |
1983年 | 1篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 8篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1954年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
A Triassic carbonate unit has been intensively drained by zinc and lead ore mines and numerous borehole fields since the nineteenth
century. Its groundwater recharge has increased due to: pumping of water from boreholes, mining activity, and urbanization.
An approach to determine the amounts of the recharge at a variety of spatial scales is presented in the paper. Different methods
were used to identify and quantify recharge components on a regional and local scale: mathematical modelling was performed
for four aquifers included in an aquifer system, an analytical estimation based on the assumption that an average recharge
is equal to the average discharge of the hydrogeological system—for six man-made drainage centres, and the method of water
level fluctuation (WLF) was applied in one observation borehole. Results of modelling have been supplemented by observation
of environmental tracers (δ18O, δ2H, 3H), noble gases temperatures, and 4Heexc in groundwater. The regional aquifer’s current recharge according to estimations performed by means of modelling varies from
39 to 101 mm/year on average. Depending on the aquifer site the average precipitation ranges from 779 to 864 mm/year. In the
confined part of the aquifer average recharge ranges from 26 to 61 mm/year. Within outcrops average recharge varies from 96
to 370 mm/year. Current recharge estimated by the analytical method for man-made drainage centres varies from 158 up to 440 mm/year.
High values are caused by different recharge sources like precipitation, induced leakage from shallow aquifers, and water
losses from streams, water mains and sewer systems. Pumping of water, mining and municipal activities constitute additional
factors accounting for the intensified recharge. 相似文献
22.
23.
Greening as strategic development in industrial change - Why companies participate in eco-networks 总被引:1,自引:0,他引:1
Eckhard Störmer 《Geoforum》2008,39(1):32-47
Networking between companies and other regional key actors has grown into a widespread instrument for economic development since the 1990s. Participatory networks have formed the concept for many activities of Local Agenda 21. Simultaneously, economic geography has focused on network theories to explain innovation in and the economic success of regions.This article focuses on the reasons why individual actors participate in environmentally oriented information networks. The questions approached are: Does the concept of learning within networks influence a firm’s development? How do the participants interact with each other? What effects do the networks have on their environment (arenas)?The changing arenas of a firm are analysed with regard to environmental concerns. These changes need to be anticipated for reliable strategies. To gain information and knowledge about current behaviour and activities, the functions of networks as learning platforms are discussed. Drawing upon arguments from different network theories, the motivations of participating in a network are threefold: actor and firm oriented, network internal (inter-firm), and network external. From these, a generic target cube of network motivations and actions is set up.The concept is reviewed by examining 12 ‘regional environmental information-oriented corporation networks’ (RUN) in the Greater Munich Area. The empirical material reveals that this type of network does not provide a guarantee for significant improvements in a firm’s environmental behaviour. However, participants learn about best practices while pursuing explicit or implicit aims as to influence their arenas. 相似文献
24.
宋微波 《中国海洋大学学报(自然科学版)》1991,(1)
九脊游仆虫(Euplotes novemcarinata Wang、1930)是土壤及淡水中生活的原生动物。本文对其重要的分类特征诸如银线系及纤毛下器做了形态学研究,确认了其分类地位,并比较了国外迄今的研究工作,在此基础上,将同物异名苔藓游仆虫(E.muscicolaKahl、1932)作了归并。 相似文献
25.
26.
南沙西部海域伸缩型右旋走滑双重构造系统及其动力学过程 总被引:7,自引:1,他引:7
刘海龄 《海洋地质与第四纪地质》1999,19(3):11-18
万纳断裂带为一典型的右旋走滑系统,由其南段前锋的拉奈—沙捞越走滑-收缩叠瓦扇、北段尾端的南海西南次海盆西南端走滑-伸展叠瓦扇和中段的万安盆地走滑-拉分双重构造所组成,其动力主要源自中生代末以来华南—印支陆缘岩石圈的拆沉作用和南海海底扩张,它的走滑拉分作用直接导致了万安盆地的产生,对该海域油气等资源的形成与聚集起了重要的控制作用。 相似文献
27.
28.
公用微机硬盘信息保护的一种有效方法 总被引:1,自引:0,他引:1
张玉彪 《中国海洋大学学报(自然科学版)》1994,(Z2)
介绍一种保护公用微机硬盘信息的有效方法.不仅可以预防各种计算机病毒,更重要的是可以防止人为操作对硬盘信息的破坏。适用于学校等开放性微机实验室的信息安全与保护. 相似文献
29.
Cao Guoao Shen Yilei
Dr.Professor Tongji University Shanghai
Shanghai College of Architectural Municipal Engineering Shanghai 《中国海洋工程》1991,(1)
In this paper, the responses of the interaction system of R.C. gravity single-leg platform to seismic excitation are mainly analysed. A set of nonlinear equations for the interaction system are established by using the wave, one is the soil-structure interaction and the other is the fluid-structure interaction. The seismic response of the interaction system is analysed for the influence of the asymmetric structure, fluid action, etc. with the input of seismic SH waves in any direction. The numerical results are given for a simple example. 相似文献
30.
随着Linux技术逐步走向成熟,嵌入式Linux技术在海洋自动观测系统中的应用将全面提高海洋观测系统整体性能,降低系统开发成本,进一步推进我国海洋自动观测系统产权自主化的建设。文章就如何研制适用于海洋自动观测系统的嵌入式Linux系统进行了论述。 相似文献