全文获取类型
收费全文 | 74697篇 |
免费 | 1543篇 |
国内免费 | 636篇 |
专业分类
测绘学 | 1813篇 |
大气科学 | 5637篇 |
地球物理 | 15415篇 |
地质学 | 25199篇 |
海洋学 | 6938篇 |
天文学 | 16460篇 |
综合类 | 190篇 |
自然地理 | 5224篇 |
出版年
2022年 | 947篇 |
2021年 | 1429篇 |
2020年 | 1489篇 |
2019年 | 1587篇 |
2018年 | 1374篇 |
2017年 | 1180篇 |
2016年 | 1457篇 |
2015年 | 1110篇 |
2014年 | 1464篇 |
2013年 | 3365篇 |
2012年 | 1578篇 |
2011年 | 2499篇 |
2010年 | 2151篇 |
2009年 | 3172篇 |
2008年 | 2765篇 |
2007年 | 2531篇 |
2006年 | 2593篇 |
2005年 | 2243篇 |
2004年 | 2500篇 |
2003年 | 2397篇 |
2002年 | 2293篇 |
2001年 | 2052篇 |
2000年 | 1930篇 |
1999年 | 1684篇 |
1998年 | 1601篇 |
1997年 | 1579篇 |
1996年 | 1201篇 |
1995年 | 1241篇 |
1994年 | 1144篇 |
1993年 | 1016篇 |
1992年 | 992篇 |
1991年 | 854篇 |
1990年 | 1040篇 |
1989年 | 891篇 |
1988年 | 801篇 |
1987年 | 956篇 |
1986年 | 891篇 |
1985年 | 1050篇 |
1984年 | 1224篇 |
1983年 | 1181篇 |
1982年 | 1028篇 |
1981年 | 1011篇 |
1980年 | 859篇 |
1979年 | 821篇 |
1978年 | 881篇 |
1977年 | 806篇 |
1976年 | 750篇 |
1975年 | 707篇 |
1974年 | 760篇 |
1973年 | 750篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
Ovsyuchenko A. N. Larkov A. S. Sysolin A. I. Rogozhin E. A. Sobisevich A. L. Chen J. Liu J. Qin J. 《Doklady Earth Sciences》2020,492(1):361-365
Doklady Earth Sciences - In October 2019, extremely impressive, fresh ruptures of the surface on the mud volcano of Mount Karabetova were discovered. The ruptures are represented by all the main... 相似文献
43.
Savelyev D. P. Khanchuk A. I. Savelyeva O. L. Moskaleva S. V. Mikhailik P. E. 《Doklady Earth Sciences》2020,491(2):199-203
Doklady Earth Sciences - More than 250 magnetic spherules 40–200 µm in size were mechanically separated from a ferromanganese crust sample of Fedorov Guyot in the Magellan Seamounts. The... 相似文献
44.
Izvestiya, Atmospheric and Oceanic Physics - The problem of atmospheric correction for shortwave channels of a multispectral low-resolution scanning radiometer onboard the Meteor-M No. 2 satellite... 相似文献
45.
Korzhenkov A. M. Gadzhiev M. S. Ovsyuchenko A. N. Lar’kov A. S. Rogozhin E. A. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(7):633-656
Izvestiya, Atmospheric and Oceanic Physics - As a result of studies conducted in the city of Derbent, it is established that its monumental fortification structures erected at the end of the 560s... 相似文献
46.
Yu Xinran Ahmadinia Masoud Shariatipour Seyed M. Lawton Don Osadetz Kirk Saeedfar Amin 《Natural Resources Research》2020,29(4):2735-2752
Natural Resources Research - Carbon capture and storage is part of Canada’s climate change action plan to reduce greenhouse gas emissions. The Containment and Monitoring Institute Field... 相似文献
47.
A Study on the Surface Wettability of Clastic Rocks with Potential Application for CO2 Storage Sites
Umar Bappah Adamu Gholami Raoof Raza Arshad Downey William Samuel Sarmadivaleh Mohammad Shah Afroz A. Nayak Prasanta 《Natural Resources Research》2020,29(3):2051-2061
Natural Resources Research - There have been many studies carried out in the past decades attempting to develop strategies for a safe injection of CO2 into storage sites without leakage and... 相似文献
48.
Natural Resources Research - Sand failure and production occurs when the formation stress exceeds the strength of the formation, which is derived majorly from the natural material that cements the... 相似文献
49.
Natural Resources Research - Borehole-controlled one-dimensional geo-electric data were integrated with water samples obtained from boreholes drilled near the vertical electrical sounding at 12... 相似文献
50.
Abstract— The possibility of volcanism on Mercury has been a topic of discussion since Mariner 10 returned images of half the planet's surface showing widespread plains material. These plains could be volcanic or lobate crater ejecta. An assessment of the mechanics of the ascent and eruption of magma shows that it is possible to have widespread volcanism, no volcanism on the surface whatsoever, or some range in between. It is difficult to distinguish between a lava flow and lobate crater ejecta based on morphology and morphometry. No definite volcanic features have been identified on Mercury. However, known lunar volcanic features cannot be identified in images with similar resolutions and viewing geometries as the Mariner 10 dataset. Examination of high‐resolution, low Sun angle Mariner 10 images reveals several features which are interpreted to be flow fronts; it is unclear if these are volcanic flows or ejecta flows. This analysis implies that a clear assessment of volcanism on Mercury must wait for better data. MESSENGER (MErcury: Surface, Space ENvironment, GEochemistry, Ranging) will take images with viewing geometries and resolutions appropriate for the identification of such features. 相似文献