全文获取类型
收费全文 | 1469篇 |
免费 | 216篇 |
国内免费 | 113篇 |
专业分类
测绘学 | 523篇 |
大气科学 | 83篇 |
地球物理 | 606篇 |
地质学 | 353篇 |
海洋学 | 32篇 |
天文学 | 2篇 |
综合类 | 95篇 |
自然地理 | 104篇 |
出版年
2024年 | 4篇 |
2023年 | 12篇 |
2022年 | 47篇 |
2021年 | 73篇 |
2020年 | 76篇 |
2019年 | 85篇 |
2018年 | 61篇 |
2017年 | 80篇 |
2016年 | 72篇 |
2015年 | 76篇 |
2014年 | 87篇 |
2013年 | 85篇 |
2012年 | 101篇 |
2011年 | 99篇 |
2010年 | 82篇 |
2009年 | 100篇 |
2008年 | 65篇 |
2007年 | 78篇 |
2006年 | 76篇 |
2005年 | 70篇 |
2004年 | 63篇 |
2003年 | 60篇 |
2002年 | 43篇 |
2001年 | 40篇 |
2000年 | 42篇 |
1999年 | 28篇 |
1998年 | 22篇 |
1997年 | 23篇 |
1996年 | 9篇 |
1995年 | 6篇 |
1994年 | 12篇 |
1993年 | 5篇 |
1992年 | 6篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1984年 | 1篇 |
排序方式: 共有1798条查询结果,搜索用时 15 毫秒
1.
Yanjun ZHANG Fenglong ZHANG Full QI Fuquan NI 《东北亚地学研究》2006,9(2):199-203
In view of the situation of excavation of open coal mine for the underground water disaster,we should carry out simulation studies for the numerical value of the water lowering project and improve the accuracy and the level of the water lowering project.On the basis of the hydrological geological conditions of certain open mine digging,a more reasonable seepage numerical model was built according to MODFLOW.It was simulated in advance that the process of the confined water level descending with the time,and combining with the actual observations to test the correctness of the model.The calculation showed that the results coincided well with the results of actual measurement.Based on this,different water lowering numerical simulations were built for the open coal mine digging.It could be simulated and forecast that the changes of the groundwater level in drainage process within and outside the mine pit,and it was quantitatively assessed that the possible water lowering result of the opencast water drainage process,which provide an important basis for the actual water lowering project and the possible project disposal. 相似文献
2.
网络经济已成为新的社会生产力的代表。广西地质矿产勘查开发局应该利用其行业和地域方面的固有优势,积极参与网络经济,以期打开矿业市场。文章提出了建立矿业网站的设想和框架。 相似文献
3.
提出川滇地洼系“四层楼”铜矿床序列的形成与陆壳演化的成生联系,是与本区陆壳由前地槽—地槽—地台—地洼演化各阶段与之相匹配的成矿作用的产物.与此同时,并总结了本区“四层楼”铜矿床序列的成矿作用具有明显的继承性、新生性、旋回性及层控性四大特点和多因复成矿床的成矿模式. 相似文献
4.
5.
6.
7.
随着城市交通的迅猛发展,交通问题已成为各国政府面临的首要问题,建立智能交通系统,将先进的地理信息技术引入城市道路交通管理已是必由之路。论文对公交网络数据模型进行深入分析。论文介绍了一种全新的面向对象的空间数据模型——Geodatabase,并对公交网络数据进行建模。 相似文献
8.
锦州湾泥沙主要来源于沿岸入海河流的输送,外海水体的携带与沿岸、岛屿蚀余物质的补给。每年进入湾内的泥沙总量约为33—35万吨,假如这些泥沙不再向湾外流出,在湾内作均匀分配沉积,则相当于在湾底铺上5mm厚的土。水准和水深重复测量表明,潮滩以稳定的弱堆积为主,水下浅滩基本处于稳定状态。该湾在非正常情况下产生骤淤的可能性不大。综合建港条件良好。 相似文献
9.
Hans Knippenberg 《GeoJournal》2006,67(4):253-265
Historical processes of state formation and nation building are crucial for an understanding of the geography of religions
and churches in Europe. Each country has developed its own model of state-church relations, giving rise to a ‘bewildering
variety’ as Grace Davie aptly remarks. The aim of this paper is to bring some order to this variety by developing a framework
for the comparative study of church-state relations based on Stein Rokkan’s famous conceptual map and recent extensions of
it to Central and Eastern Europe by John Madeley. According to that framework Europe has been divided into three mono-confessional
(Roman Catholic, Lutheran, and Eastern Orthodox) blocs and two multi-confessional culture belts from Northwest to Southeast,
and from Northeast to Southeast. This historical pattern has been challenged by secularisation, which started with the Enlightenment
and the French Revolution (Western Europe) and the Russian Revolution (Eastern Europe until the velvet revolutions of 1989/1991)
and then became widespread after the ‘cultural revolutions’ of the 1960s. A second challenge has to do with globalisation
and its consequences, such as massive immigration and the rise of immigrant religions, and in general deterritorialisation,
which means the disembeddedness of religion from its national territory. A third challenge concerns reterritorialisation at
other (supranational, regional, transnational, and local) scales, of which the new territorial order of the European Union
seems to be the most important. Finally, this paper serves as an introduction to the case studies on church-state relations
in this special issue. 相似文献
10.