全文获取类型
收费全文 | 368篇 |
免费 | 1篇 |
国内免费 | 5篇 |
专业分类
测绘学 | 4篇 |
大气科学 | 20篇 |
地球物理 | 51篇 |
地质学 | 170篇 |
海洋学 | 39篇 |
天文学 | 70篇 |
综合类 | 1篇 |
自然地理 | 19篇 |
出版年
2024年 | 1篇 |
2022年 | 3篇 |
2021年 | 5篇 |
2020年 | 5篇 |
2019年 | 2篇 |
2018年 | 7篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 5篇 |
2014年 | 2篇 |
2013年 | 32篇 |
2012年 | 11篇 |
2011年 | 21篇 |
2010年 | 17篇 |
2009年 | 25篇 |
2008年 | 26篇 |
2007年 | 15篇 |
2006年 | 12篇 |
2005年 | 27篇 |
2004年 | 16篇 |
2003年 | 16篇 |
2002年 | 18篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1999年 | 9篇 |
1998年 | 13篇 |
1997年 | 5篇 |
1996年 | 5篇 |
1995年 | 8篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 1篇 |
1976年 | 3篇 |
1973年 | 2篇 |
1960年 | 1篇 |
排序方式: 共有374条查询结果,搜索用时 93 毫秒
371.
In the 2000 and 2001 springtime periods, mesozooplankton samples were systematically taken during research cruises devoted
to the study of the distribution and abundance of small pelagic fishes in the French part of the Bay of Biscay, NE Atlantic,
continental shelf. Simultaneous activities of three enzymes were measured in these mesozooplankton samples, to characterize
the main features of ecosystem function at a regional scale. The aim was to assess assimilation rates of carbohydrates, through
pyruvate kinase activity, and protein, through trypsin activity, by the mesozooplankton community and the resulting overall
productivity, through aspartate transcarbamylase activity. The highest influence on the pelagic environment was the strong
difference in the freshwater outflow rates from the two main large rivers, the Loire and the Gironde, which was principally
responsible for the inter-annual fluctuations of the nutrients in the Bay. This overall influence of river flow results in
a characteristic pattern of sea-surface salinity, which was reflected by the phytoplankton biomass distribution. Mesozooplankton
enzyme activities showed high variations between the two years. The contrast in the dynamics of the pelagic food web processes
between the two consecutive years, with higher activity in 2001, affected the nutritional condition of the zooplanktivorous
breeding anchovy Engraulis encrasicolus. 相似文献
372.
Thibault Duretz Riccardo Asti Yves Lagabrielle Jean-Pierre Brun Anthony Jourdon Camille Clerc Benjamin Corre 《Basin Research》2020,32(4):652-667
The preshortening Cretaceous Pyrenean Rift is an outstanding geological laboratory to investigate the effects of a pre-rift salt layer at the sedimentary base on lithospheric rifting. The occurrence of a pre-rift km-scale layer of evaporites and shales promoted the activation of syn-rift salt tectonics from the onset of rifting. The pre- and syn-rift sediments are locally affected by high-temperature metamorphism related to mantle ascent up to shallow depths during rifting. The thermo-mechanical interaction between décollement along the pre-existing salt layer and mantle ascent makes the Cretaceous Pyrenean Rifting drastically different from the type of rifting that shaped most Atlantic-type passive margins where salt deposition is syn-rift and gravity-driven salt tectonics has been postrift. To unravel the dynamic evolution of the Cretaceous Pyrenean Rift, we carried out a set of numerical models of lithosphere-scale extension, calibrated using the available geological constraints. Models are used to investigate the effects of a km-scale pre-rift salt layer, located at the sedimentary cover base, on the dynamics of rifting. Our results highlight the key role of the décollement layer at cover base that can alone explain both salt tectonics deformation style and high-temperature metamorphism of the pre-rift and syn-rift sedimentary cover. On the other hand, in the absence of décollement, our model predicts symmetric necking of the lithosphere devoid of any structure and related thermal regime geologically relevant to the Pyrenean case. 相似文献
373.
粤北晚泥盆世天子岭组遗迹组构及其环境解释 总被引:1,自引:0,他引:1
遗迹组构是由生物成因改造的沉积岩组构,它是物理过程和生物过程相互作用的产物。本文在广东韶关晚泥盆世天子岭组碳酸盐岩沉积中建立了4个遗迹组构,即反映局限台地或封闭海湾环境的Planolies montanus遗迹组构,反映台地潮下低能环境的Thalassinoides—Planolites遗迹组构,反映潮上-潮间环境的.Skolithos遗迹组构和受固底底质控制的Thalassinoides遗迹组构。对遗迹化石和生物扰动构造进行阶层分析,从中识别出受固底底质控制的遗迹化石Thalassinoides.sp,这类遗迹化石常常代表层序地层学中的重要界面。 相似文献
374.
Jean-Pierre Rivet Farrokh Vakili Olivier Lai David Vernet Mathilde Fouché William Guerin Guillaume Labeyrie Robin Kaiser 《Experimental Astronomy》2018,46(3):531-542
More than sixty years after the first intensity correlation experiments by Hanbury Brown and Twiss, there is renewed interest for intensity interferometry techniques for high angular resolution studies of celestial sources. We report on a successful attempt to measure the bunching peak in the intensity correlation function for bright stellar sources with 1 meter telescopes (I2C project). We propose further improvements of our preliminary experiments of spatial interferometry between two 1 m telescopes, and discuss the possibility to export our method to existing large arrays of telescopes. 相似文献