全文获取类型
收费全文 | 292篇 |
免费 | 11篇 |
国内免费 | 1篇 |
专业分类
测绘学 | 5篇 |
大气科学 | 68篇 |
地球物理 | 56篇 |
地质学 | 87篇 |
海洋学 | 23篇 |
天文学 | 48篇 |
自然地理 | 17篇 |
出版年
2022年 | 3篇 |
2021年 | 4篇 |
2020年 | 3篇 |
2019年 | 8篇 |
2018年 | 5篇 |
2017年 | 7篇 |
2016年 | 16篇 |
2015年 | 10篇 |
2014年 | 23篇 |
2013年 | 16篇 |
2012年 | 19篇 |
2011年 | 18篇 |
2010年 | 14篇 |
2009年 | 17篇 |
2008年 | 22篇 |
2007年 | 14篇 |
2006年 | 18篇 |
2005年 | 11篇 |
2004年 | 10篇 |
2003年 | 12篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1962年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有304条查询结果,搜索用时 203 毫秒
11.
A new elastoplastic model called loading memory surface based on the critical state concept and the multi‐surface framework is proposed for geomaterials. The model uses a hypoelastic formulation and two plastic mechanisms. The formulations of the model are made in three‐dimensional stress–strain space and work under both monotonic and cyclic loadings. A newly introduced formalism makes it possible to obtain the cyclic response directly from the monotonic loading one. This formalism gives a three‐dimensional generalization of the well‐known Masing rule. The model has been validated against test results of Hostun sand under several conditions: monotonic and cyclic, drained and undrained, tests in compression and in extension, and at different confining pressures and different densities. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
12.
13.
14.
15.
16.
Tomoki Tozuka Jing-Jia Luo Sebastien Masson Swadhin K. Behera Toshio Yamagata 《Dynamics of Atmospheres and Oceans》2005,39(1-2):41
Using an output from 200-year integration of the Scale Interaction Experiment of EU project-F1 model (SINTEX-F1), the annual ENSO reproduced in the coupled general circulation model is investigated, suggesting the importance of reproducing an annual cycle in realistically simulating ENSO events. Although many features of the annual ENSO are reproduced, the northward expansion of sea surface temperature anomaly (SSTA) in the eastern tropical Pacific stays south of the equator. It is suggested that this model bias is due to the excitation of the too strong Rossby waves in the southeastern tropical Pacific, which reflect at the western boundary and intrude into the eastern equatorial Pacific. The zonal wind stress anomaly along the equator also plays an important role in generating the equatorial Kelvin waves. The amplitude of SSTA for the annual ENSO mode is reproduced, but its variance is only 20% of the observation; this is again due to the lack of northward migration of seasonal SSTA in the equatorial region and weaker coastal Kelvin waves along South America. Remedies for the model bias are discussed. 相似文献
17.
18.
Matthieu Ferry Mustapha Meghraoui Najib Abou Karaki Masdouq Al-Taj Hani Amoush Salman Al-Dhaisat Majdi Barjous 《Earth and Planetary Science Letters》2007,260(3-4):394-406
We investigate the late Quaternary active deformation along the Jordan Valley segment of the left-lateral Dead Sea Fault and provide new insights on the behaviour of major continental faults. The 110-km-long fault segment shows systematic offsets of drainage systems surveyed at three sites along its southern section. The isotopic dating of six paleoclimatic events yields a precise chronology for the onset of six generations of gully incisions at 47.5 ka BP, 37.5 ka BP, 13 ka BP, 9 ka BP, 7 ka BP, and 5 ka BP. Additionally, detailed mapping and reconstructions provide cumulative displacements for 20 dated incisions along the fault trace. The individual amounts of cumulative slip consistently fall into six distinct classes. This yields: i) an average constant slip rate of 4.7 to 5.1 mm/yr for the last 47.5 kyr and ii) a variable slip rate ranging from 3.5 mm/yr to 11 mm/yr over 2-kyr- to 24-kyr-long intervals. Taking into account that the last large earthquake occurred in AD 1033, we infer 3.5 to 5 m of present-day slip deficit which corresponds to a Mw 7.4 earthquake along the Jordan Valley fault segment. The timing of cumulative offsets reveals slip rate variations critical to our understanding of the slip deficit and seismic cycle along major continental faults. 相似文献
19.
F. Couvreux F. Guichard V. Masson J.-L. Redelsperger 《Boundary-Layer Meteorology》2007,123(2):269-294
This study focuses on the intrusion of dry air into the convective boundary layer (CBL) originating from the top of the CBL.
Aircraft in-situ measurements from the IHOP_2002 field campaign indicate a prevalence of negative skewness of the water vapour
distribution within the growing daytime CBL over land. This negative skewness is interpreted according to large-eddy simulations
(LES) as the result of descending dry downdrafts originating from above the mixed layer. LES are used to determine the statistical
properties of these intrusions: their size and thermodynamical characteristics. A conditional sampling analysis demonstrates
their significance in the retrieval of moisture variances and fluxes. The rapid CBL growth explains why greater negative skewness
is observed during the growing phase: the large amounts of dry air that are quickly incorporated into the CBL prevent a full
homogenisation by turbulent mixing. The boundary-layer warming in this phase also plays a role in the acquisition of negative
buoyancy for these dry tongues, and thus possibly explains their kinematics in the lower CBL. Budget analysis helps to identify
the processes responsible for the negative skewness. This budget study underlines the main role of turbulent transport, which
distributes the skewness produced at the top or the bottom of the CBL into the interior of the CBL. The dry tongues contribute
significantly to this turbulent transport. 相似文献
20.
The Rockall Trough separates the Rockall Plateau microcontinent from the shelf and slope west of the British Isles. The structure and age of the trough has been the source of considerable discussion. Although widely considered to be of oceanic origin, postulated ages for the spreading range from Permian to Cretaceous. New seismic profiles linked to the IPOD sites in the Bay of Biscay and to oceanic anomalies of known age are used to present a new assessment of the age and structure of the southern Rockall Trough. It is concluded that about 120 km of ocean crust is present in the trough and that spreading took place in the Albian-Maastrichtian interval. 相似文献