全文获取类型
收费全文 | 696篇 |
免费 | 62篇 |
国内免费 | 11篇 |
专业分类
测绘学 | 36篇 |
大气科学 | 52篇 |
地球物理 | 185篇 |
地质学 | 265篇 |
海洋学 | 72篇 |
天文学 | 74篇 |
综合类 | 2篇 |
自然地理 | 83篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 21篇 |
2020年 | 18篇 |
2019年 | 25篇 |
2018年 | 30篇 |
2017年 | 28篇 |
2016年 | 34篇 |
2015年 | 27篇 |
2014年 | 39篇 |
2013年 | 69篇 |
2012年 | 37篇 |
2011年 | 30篇 |
2010年 | 29篇 |
2009年 | 39篇 |
2008年 | 31篇 |
2007年 | 36篇 |
2006年 | 24篇 |
2005年 | 25篇 |
2004年 | 21篇 |
2003年 | 15篇 |
2002年 | 17篇 |
2001年 | 15篇 |
2000年 | 14篇 |
1999年 | 13篇 |
1998年 | 9篇 |
1997年 | 9篇 |
1996年 | 6篇 |
1995年 | 7篇 |
1994年 | 8篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 10篇 |
1990年 | 5篇 |
1989年 | 8篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 5篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1967年 | 2篇 |
1966年 | 3篇 |
排序方式: 共有769条查询结果,搜索用时 31 毫秒
81.
82.
Kapil Chauhan Nicholas Hutchins Jason Monty Ivan Marusic 《Boundary-Layer Meteorology》2013,147(1):41-50
Two-point correlations of the fluctuating streamwise velocity are examined in the atmospheric surface layer over the salt flats of Utah’s western desert, and corresponding structure inclination angles are obtained for neutral, stable and unstable conditions. The neutral surface-layer results supplement evidence for the invariance of the inclination angle given in Marusic and Heuer (Phys Rev Lett 99:114504, 2007). In an extension of those results it is found that the inclination angle changes drastically under different stability conditions in the surface layer, varying systematically with the Monin–Obukhov stability parameter in the unstable regime. The variation is parametrized and subsequently can be used to improve existing near-wall models in the large-eddy simulation of the atmospheric surface layer. 相似文献
83.
Flooding on the German Rhine during the 20th century was tested for trends and assessed to identify causal mechanisms driving worsening of flooding. A review of previous research outlines the range of impacts due to climate change, land‐use shifts, and river regulation. Analysis of hydrologic data, especially of the long record at Cologne, documents statistically significant increases in both flood magnitudes and frequencies. Specific‐gauge analysis, which isolates the effects of channel modification, documents that 20th century river engineering has caused little of the observed increase in flooding on the German Rhine. Precipitation records from the Rhine basin confirm that flood magnification has been driven by upstream factors, including an increase in flood‐producing precipitation of roughly 25% during the past 100 years and increases in runoff yields. In addition, agricultural land‐use records suggest that flood magnification can be partially explained by 20th century trends documenting intensification and industrialization of German agriculture. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
84.
William S. Burgett Michael M. Vick David S. Davis Matthew Colless Roberto De Propris Ivan Baldry Carlton Baugh Joss Bland-Hawthorn Terry Bridges Russell Cannon Shaun Cole Chris Collins Warrick Couch Nicholas Cross Gavin Dalton Simon Driver George Efstathiou Richard Ellis Carlos S. Frenk Karl Glazebrook Edward Hawkins Carole Jackson Ofer Lahav Ian Lewis Stuart Lumsden Steve Maddox Darren Madgwick Peder Norberg John A. Peacock Will Percival Bruce Peterson Will Sutherland Keith Taylor 《Monthly notices of the Royal Astronomical Society》2004,352(2):605-654
85.
86.
Nicholas J. Cox 《The Professional geographer》1980,32(1):51-54
Hitch-hiking has been ignored by traditional geography. In this article it is shown that ideas and techniques from the new geography yield substantial insights into its character as a spatial process. 相似文献
87.
88.
89.
Ilhem Bentaleb Cyril Langlois Céline Martin Paula Iacumin Matthieu Carré Pierre-Olivier Antoine Francis Duranthon Issam Moussa Jean-Jacques Jaeger Nicholas Barrett Ron Kandorp 《Comptes Rendus Geoscience》2006,338(3):172-179
The relationship between the oxygen isotope ratio of mammal tooth enamel and that of drinking water was used to reconstruct changes in the Miocene oxygen isotope ratio of rainfall (meteoric water OMW). These, in turn, are related to climatic parameters (temperature, precipitation and evaporation rate). O values of rhinocerotid teeth from the Aquitaine Basin (southwestern France) suggest a significant climatic change between 17 and 12 Ma, characterized by cooling together with precipitation increase, in agreement with other terrestrial and oceanic records. To cite this article: I. Bentaleb et al., C. R. Geoscience 338 (2006). 相似文献
90.