全文获取类型
收费全文 | 22936篇 |
免费 | 4005篇 |
国内免费 | 4006篇 |
专业分类
测绘学 | 3443篇 |
大气科学 | 2342篇 |
地球物理 | 5860篇 |
地质学 | 10668篇 |
海洋学 | 1987篇 |
天文学 | 1978篇 |
综合类 | 1960篇 |
自然地理 | 2709篇 |
出版年
2024年 | 59篇 |
2023年 | 183篇 |
2022年 | 547篇 |
2021年 | 733篇 |
2020年 | 699篇 |
2019年 | 932篇 |
2018年 | 685篇 |
2017年 | 847篇 |
2016年 | 845篇 |
2015年 | 956篇 |
2014年 | 1158篇 |
2013年 | 1207篇 |
2012年 | 1303篇 |
2011年 | 1374篇 |
2010年 | 1154篇 |
2009年 | 1429篇 |
2008年 | 1470篇 |
2007年 | 1623篇 |
2006年 | 1616篇 |
2005年 | 1471篇 |
2004年 | 1459篇 |
2003年 | 1241篇 |
2002年 | 1170篇 |
2001年 | 989篇 |
2000年 | 961篇 |
1999年 | 776篇 |
1998年 | 761篇 |
1997年 | 592篇 |
1996年 | 532篇 |
1995年 | 459篇 |
1994年 | 435篇 |
1993年 | 333篇 |
1992年 | 258篇 |
1991年 | 161篇 |
1990年 | 131篇 |
1989年 | 138篇 |
1988年 | 87篇 |
1987年 | 69篇 |
1986年 | 27篇 |
1985年 | 21篇 |
1984年 | 10篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 25篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1954年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
481.
482.
483.
Haruko Sekiguchi Kojiro Irikura Tomotaka Iwata 《Geophysical Journal International》2002,150(2):377-391
484.
In the Haushi-Huqf (Eastern Central Oman) as in other parts of the Arabian platform, a major sedimentary break is recorded between the Early Aptian carbonates (Shu'aiba Formation) and the Albian orbitolinid-rich marls (Nahr Umr Formation). The unconformity corresponds to a succession of events: (1) a brusque interruption of the regressive sequence of the Shu'aiba limestone (algae and small rudistid build-ups); (2) a stratigraphic gap related to the Late Aptian; (3) the development of a thick ferruginous crust (hardground) that covered the top surface of the Shu'aiba; the hardground is related to a forced flooding surface; (4) the Shu'aiba was rapidly drowned and buried under the Nahr Umr marls. Moreover, the Shu'aiba limestone was subject to faulting NW–SE-trending normal faults before lithification and formation of the ferruginous crust. The faulting episode is clearly dated: post-Early Aptian and pre-Albian. The signification of the faulting remains hypothetical. The syndiagenetic NW–SE normal faults may correspond to ‘en echelon’ faults, combined with transcurrent fault movements (for example the Haushi-Nafun Fault). The possible causes of these intra-platform transcurrent movements are discussed. To cite this article: C. Montenat, P. Barrier, C. R. Geoscience 334 (2002) 781–787. 相似文献
485.
We analyse longitudinal river profiles in southwestern Taiwan. As all necessary data are not available, a physical modelling of river erosion would be subject to large uncertainties. We thus shortcut this modelling and adopt simple empirical exponential equations giving riverbed elevation as a function of downstream distance. We identify a positive altimetric anomaly, which reveals active uplift of an anticline at the front of the fold-and-thrust belt. To cite this article: J. Angelier, R.-F. Chen, C. R. Geoscience 334 (2002) 1103–1111. 相似文献
486.
Environmental degradation and other socio-economic problems are too often discerned in contemporary pastoral systems in the wake of global economic change. This paper identifies cases where pastoral people respond to external pressures and opportunities in positive ways and adapt to changes. We hope that by doing this a framework of pastoral adaptations can be developed. The first part of this paper focuses on impacts of global economic change, which are mostly negative in nature. Through an extensive literature search in geography, anthropology, range management, and development field, the second part introduces cases that we categorize as positive adaptations. 相似文献
487.
Sedimentary successions and internal structure of the coastal barrier-lagoon system of Boao, eastern Hainan Island were studied through utilizing data from test holes and trenches and ground-penetrating-radar (GPR) profiles. During late Pleistocene, fluvial and delta plains developed over an unevenly eroded bedrock during low sea level stand, followed by the formation of littoral and lagoon facies and defined coastal barrier-lagoon-estuary system during the post-glacial uppermost Pleistocene-lower Holocene eustatic rise of the sea level, and the upper Holocene high stand. GPR results show that Yudaitan, a sandy coastal bar backed by a low-laying land (shoal) just east of the active lagoon, is a continuous, parallel and slightly-wavy reflectors indicating homogeneous sandy or sandy gravel sediments, and inclined reflectors partly caused by progradation and accumulation of beach sand and gravel. Quasi-continuous, hummocky and chaotic reflectors from the shoal of Nangang village correspond to mixed accumulation of sands and clay. This research indicates the GPR is a non-intrusive, rapid, and economical method for high-resolution profiling of subsurface sediments in sandy gravelly coast. 相似文献
488.
基于空间信息技术的城市应急救援联动系统研究 总被引:26,自引:0,他引:26
该文分析国内外城市现代救援体系及其发展趋势,对基于统一的空间信息基础设施平台分布式城市应急救援联动系统(体系结构与系统实现)的关键技术进行研究,以成都市城市应急救援联动系统为例,探讨了城市应急救援联动系统的构成、功能、业务流程、系统平台、用户界面等。 相似文献
489.
设备树在路灯AM/FM/GIS系统中的应用研究 总被引:1,自引:0,他引:1
该文提出了AM/FM/GIS中基于“设备树”的设备设施管理模式,运用“设备树”来组织路灯电力网络中的设备设施对象;阐述了如何从设备设施的物理模型抽象出具有树状层次结构的逻辑网络模型,并根据该逻辑模型设计相应的数据结构来构建“设备树”;并介绍了设备树在南京市路灯AM/FM/GIS系统中的设计与实现。 相似文献
490.
东莞城市化过程中若干问题研究 总被引:10,自引:3,他引:10
黄靖 《地理与地理信息科学》2003,19(5):73-76
改革开放以来,东莞市积极吸纳海外资本与技术,通过“三来一补”企业的快速发展,带动了非农产业和小城镇的迅速发展。然而,受我国分散的工业化和农村城市化政策体制的影响,在快速城市化过程中也暴露出很多值得关注的问题。该文基于实地考察与问卷访谈,重点分析了土地利用效率低、外来人口集中以及基础设施建设与城市经济发展不相协调等问题,并提出协调城市化发展的对策。 相似文献