全文获取类型
收费全文 | 249091篇 |
免费 | 5261篇 |
国内免费 | 3255篇 |
专业分类
测绘学 | 6754篇 |
大气科学 | 18800篇 |
地球物理 | 52119篇 |
地质学 | 85834篇 |
海洋学 | 21122篇 |
天文学 | 54250篇 |
综合类 | 980篇 |
自然地理 | 17748篇 |
出版年
2021年 | 2152篇 |
2020年 | 2565篇 |
2019年 | 2816篇 |
2018年 | 2994篇 |
2017年 | 2690篇 |
2016年 | 5420篇 |
2015年 | 4163篇 |
2014年 | 6882篇 |
2013年 | 14177篇 |
2012年 | 6252篇 |
2011年 | 7422篇 |
2010年 | 6461篇 |
2009年 | 9130篇 |
2008年 | 8002篇 |
2007年 | 7399篇 |
2006年 | 9610篇 |
2005年 | 7637篇 |
2004年 | 7535篇 |
2003年 | 7014篇 |
2002年 | 6638篇 |
2001年 | 5947篇 |
2000年 | 5912篇 |
1999年 | 4803篇 |
1998年 | 4849篇 |
1997年 | 4619篇 |
1996年 | 4196篇 |
1995年 | 4301篇 |
1994年 | 3986篇 |
1993年 | 3738篇 |
1992年 | 3479篇 |
1991年 | 3520篇 |
1990年 | 3620篇 |
1989年 | 3318篇 |
1988年 | 3161篇 |
1987年 | 3716篇 |
1986年 | 3254篇 |
1985年 | 4109篇 |
1984年 | 4620篇 |
1983年 | 4304篇 |
1982年 | 4216篇 |
1981年 | 3831篇 |
1980年 | 3588篇 |
1979年 | 3432篇 |
1978年 | 3431篇 |
1977年 | 3220篇 |
1976年 | 2966篇 |
1975年 | 2903篇 |
1974年 | 2870篇 |
1973年 | 3061篇 |
1972年 | 1994篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
Fayman P. A. Prants S. V. Budyansky M. V. Uleysky M. Yu. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(6):618-631
Izvestiya, Atmospheric and Oceanic Physics - Using the eddy-permitting model, circulation in the Okhotsk Sea and in an adjacent area of the Pacific Ocean is retrospectively simulated from 1991 to... 相似文献
102.
Doklady Earth Sciences - For the first time, a detailed density 3D model of the lithosphere of the Sikhote-Alin orogenic belt to a depth of 130 km has been created. Two extended submeridional... 相似文献
103.
The development of the solar magnetic activity in cycle 24 has been analyzed. It has been shown that the significant north–south asymmetry of magnetic activity was accompanied by the asynchronous reorganization of solar magnetic fields in the northern and southern hemispheres. The formation of unipolar magnetic regions after the decay of activity centers has been studied. The meridional transport of unipolar magnetic regions leading to changes in the zonal structure of the solar magnetic field has been shown. Long-lived centers of flare activity have been found to exist during the periods of magnetic field restructuring. The spatiotemporal analysis of the flare ensemble making it possible to diagnose non-stationary processes in the solar atmosphere has been shown. 相似文献
104.
Sychev S. N. Khudoley A. K. Lebedeva O. Yu. Rogov A. V. Sokolov S. D. Chamberlain K. R. Maklashin V. S. Lvov P. A. 《Doklady Earth Sciences》2020,494(2):762-766
Doklady Earth Sciences - U–Pb dating of zircons from granitoids located within the Rassokha terrane show a Silurian age of their formation. Younger dates from one of the samples are related... 相似文献
105.
Ginzburg A. S. Semenov V. A. Semutnikova E. G. Aleshina M. A. Zakharova P. V. Lezina E. A. 《Doklady Earth Sciences》2020,495(1):862-866
Doklady Earth Sciences - The results of an analysis of changes in the atmospheric air quality in Moscow during the lockdown period and the decline in business activity caused by the COVID-19... 相似文献
106.
Ishin S. V. Vikulenkov V. P. Fedoskin D. I. Poreshnev A. Yu. Jumahanov N. B. Yakovlev B. D. 《Solar System Research》2020,54(7):690-698
Solar System Research - Abstract—Results of the implementation of a single concept for the development of the double launch system (SDZ) are presented, in particular the SDZ-La5 for the... 相似文献
107.
Solar System Research - A method has been developed for detecting impact orbits of asteroids in the confidence ellipsoid of the initial parameters of motion. The method consists in conditionally... 相似文献
108.
Astronomy Letters - The reduction of all the available photometry for the Cepheid ET Vul has allowed its $$O-C$$ diagram spanning a time interval of 130 years to be constructed. This has made it... 相似文献
109.
Jrme Gattacceca Francis M. Mccubbin Audrey Bouvier Jeffrey Grossman 《Meteoritics & planetary science》2020,55(2):460-462
Meteoritical Bulletin 107 contains 2714 meteorites including 16 falls (Aba Panu, Ablaketka, Andila, Gueltat Zemmour, Hamburg, Karimati, Mahbas Arraid, Mangui, Mazichuan, Mukundpura, Ozerki, Parauapebas, Renchen, San Pedro de Urabá, Sokoto, Tintigny), with 2226 ordinary chondrites, 168 HED achondrites, 132 carbonaceous chondrites (including 41 CM, 34 CV, 26 CO, 21 CK, 4 CR, 5 ungrouped), 43 ureilites, 30 iron meteorites (including 2 ungrouped), 29 lunar meteorites, 22 Martian meteorites, 16 primitive achondrites (including 3 brachinites), 12 Rumuruti chondrites, 9 enstatite chondrites, 7 ungrouped achondrites, 6 pallasites, 5 mesosiderites, 3 enstatite achondrites, 3 ungrouped chondrites, and 2 angrites. 1569 meteorites are from Antarctica, 835 from Africa, 206 from South America, 62 from Asia, 21 from North America, 11 from unknown locations, 8 from Europe (including one from Russia), and 1 from Oceania. 相似文献
110.
Solar System Research - Results of the numerical study of the flow past the frontal aerodynamic screen of the descent vehicle of the ExoMars project, the determination of aerodynamic... 相似文献