全文获取类型
收费全文 | 2536篇 |
免费 | 146篇 |
国内免费 | 32篇 |
专业分类
测绘学 | 88篇 |
大气科学 | 291篇 |
地球物理 | 652篇 |
地质学 | 779篇 |
海洋学 | 215篇 |
天文学 | 360篇 |
综合类 | 6篇 |
自然地理 | 323篇 |
出版年
2022年 | 13篇 |
2021年 | 49篇 |
2020年 | 59篇 |
2019年 | 53篇 |
2018年 | 66篇 |
2017年 | 80篇 |
2016年 | 106篇 |
2015年 | 88篇 |
2014年 | 97篇 |
2013年 | 187篇 |
2012年 | 117篇 |
2011年 | 156篇 |
2010年 | 119篇 |
2009年 | 140篇 |
2008年 | 140篇 |
2007年 | 139篇 |
2006年 | 132篇 |
2005年 | 108篇 |
2004年 | 91篇 |
2003年 | 92篇 |
2002年 | 81篇 |
2001年 | 51篇 |
2000年 | 58篇 |
1999年 | 38篇 |
1998年 | 34篇 |
1997年 | 32篇 |
1996年 | 28篇 |
1995年 | 30篇 |
1994年 | 18篇 |
1993年 | 20篇 |
1992年 | 12篇 |
1991年 | 17篇 |
1990年 | 15篇 |
1989年 | 28篇 |
1988年 | 11篇 |
1987年 | 20篇 |
1986年 | 11篇 |
1985年 | 22篇 |
1984年 | 14篇 |
1983年 | 14篇 |
1982年 | 13篇 |
1981年 | 18篇 |
1980年 | 12篇 |
1979年 | 13篇 |
1978年 | 10篇 |
1977年 | 7篇 |
1976年 | 6篇 |
1975年 | 8篇 |
1974年 | 8篇 |
1972年 | 5篇 |
排序方式: 共有2714条查询结果,搜索用时 46 毫秒
271.
Andrew R. Liddle Pedro T. P. Viana A. Kathy Romer Robert G. Mann 《Monthly notices of the Royal Astronomical Society》2001,325(2):875-880
The redshift evolution of the galaxy cluster temperature function is a powerful probe of cosmology. However, its determination requires the measurement of redshifts for all clusters in a catalogue, which is likely to prove challenging for large catalogues expected from XMM-Newton , which may contain of the order of 2000 clusters with measurable temperatures, distributed around the sky. In this paper we study the apparent cluster temperature, which can be obtained without cluster redshifts. We show that the apparent temperature function itself is of limited use in constraining cosmology, and so concentrate our focus on studying how apparent temperatures can be combined with other X-ray information to constrain the cluster redshift. We also briefly study the circumstances under which the non-thermal spectral features can provide redshift information. 相似文献
272.
273.
274.
275.
Visser Ate Kwicklis Edward Farnham Irene Tompson Andrew F. B. Hershey Ronald L. 《Hydrogeology Journal》2022,30(1):203-220
Hydrogeology Journal - Pahute Mesa (Nevada, USA) was the site of 85 underground nuclear tests between 1965 and 1992 whose residual radiochemical inventory poses a contaminant threat to local... 相似文献
276.
Nikolinakou Maria A. Whittle Andrew J. Germaine John T. Zhang Guoping 《Acta Geotechnica》2022,17(5):1569-1584
Acta Geotechnica - We present experimental observations and a conceptual model for understanding the compression and swelling characteristics of Old Alluvium (OA) from San Juan, Puerto Rico. Prior... 相似文献
277.
Natural Hazards - The central USA has experienced an increase in the frequency and magnitude of human-induced earthquakes. The earthquakes are caused by the deep-well injection of water produced... 相似文献
278.
279.
Geology and regional significance of the Sarnoo Hills,eastern rift margin of the Barmer Basin,NW India 下载免费PDF全文
Andrew J. Bladon Stuart D. Burley Stuart M. Clarke Hazel Beaumont 《Basin Research》2015,27(5):636-655
The Barmer Basin is a poorly understood rift basin in Rajasthan, northwest India. Exposures in the Sarnoo Hills, situated along the central eastern rift margin of the Barmer Basin, reveal a sedimentary succession that accumulated prior to the main Barmer Basin rift event, and a rift‐oblique fault network that displays unusual geometries and characteristics. Here, we present a comprehensive study of Lower Cretaceous sedimentology on the basin margin, along with a detailed investigation of rift‐oblique faults that are exposed nowhere else in the region and provide critical insights into Barmer Basin evolution. Lower Cretaceous sediments were deposited within a rapidly subsiding alluvial plain fluvial system. Subsequent to deposition, the evolving Sarnoo Hills fault network was affected by structural inheritance during an early, previously unrecognised, rift‐oblique extensional event attributed to transtension between India and Madagascar, and formed a juvenile fault network within the immediate rift‐margin footwall. Ghaggar‐Hakra Formation deposition may have been triggered by early rifting which tectonically destabilised the Marwar Craton prior to the main northeast–southwest Barmer Basin rift event. The identification of early rifting in the Barmer Basin demonstrates that regional extension and the associated rift systems were established throughout northwest India prior to the main phase of Deccan eruptions. Inheritance of early oblique fault systems within the evolving Barmer Basin provides a robust explanation for poorly understood structural complications interpreted in the subsurface throughout the rift. Critically, the presence of syn‐rift sedimentary successions within older oblique rift systems obscured beneath the present‐day Barmer Basin has significant implications for hydrocarbon exploration. 相似文献
280.