全文获取类型
收费全文 | 239篇 |
免费 | 8篇 |
国内免费 | 11篇 |
专业分类
测绘学 | 6篇 |
大气科学 | 47篇 |
地球物理 | 52篇 |
地质学 | 84篇 |
海洋学 | 14篇 |
天文学 | 39篇 |
综合类 | 4篇 |
自然地理 | 12篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 6篇 |
2019年 | 11篇 |
2018年 | 12篇 |
2017年 | 7篇 |
2016年 | 19篇 |
2015年 | 15篇 |
2014年 | 23篇 |
2013年 | 27篇 |
2012年 | 16篇 |
2011年 | 10篇 |
2010年 | 13篇 |
2009年 | 14篇 |
2008年 | 10篇 |
2007年 | 8篇 |
2006年 | 12篇 |
2005年 | 9篇 |
2004年 | 7篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 1篇 |
排序方式: 共有258条查询结果,搜索用时 0 毫秒
181.
Andrey N. Belikov Fokke Dijkstra Hans Gankema Jeroen B. A. N. van Hoof Rick Koopman 《Experimental Astronomy》2013,35(1-2):367-389
The Target infrastructure has been specially built as a storage and compute infrastructure for the information systems derived from Astro-WISE. This infrastructure will be used by several applications that collaborate in the area of information systems within the Target project. It currently consists of 10 PB of storage and thousands of computational cores. The infrastructure has been constructed based on the requirements of the applications. The storage is controlled by the Global Parallel File System of IBM. This file system takes care of the required flexibility by combining storage hardware with different characteristics into a single file system. It is also very scalable, which allows the system to be extended into the future, while replacing old hardware with new technology. 相似文献
182.
The distribution of solutes between coexisting liquid and vapor phases of water can be expressed by the distribution constant, KD, defined as
183.
184.
Density-dependent dispersion in heterogeneous porous media Part II: Comparison with nonlinear models 总被引:1,自引:0,他引:1
Anke Jannie Landman Ruud Schotting Andrey Egorov Denis Demidov 《Advances in water resources》2007,30(12):2481-2498
The results of a series of high-resolution numerical experiments are used to test and compare three nonlinear models for high-concentration-gradient dispersion. Gravity stable miscible displacement is considered. The first model, introduced by Hassanizadeh, is a modification of Fick’s law which involves a second-order term in the dispersive flux equation and an additional dispersion parameter β. The numerical experiments confirm the dependency of β on the flow rate. In addition, a dependency on travelled distance is observed. The model can successfully be applied to nearly homogeneous media (σ2 = 0.1), but additional fitting is required for more heterogeneous media.The second and third models are based on homogenization of the local scale equations describing density-dependent transport. Egorov considers media that are heterogeneous on the Darcy scale, whereas Demidov starts at the pore-scale level. Both approaches result in a macroscopic balance equation in which the dispersion coefficient is a function of the dimensionless density gradient. In addition, an expression for the concentration variance is derived. For small σ2, Egorov’s model predictions are in satisfactory agreement with the numerical experiments without the introduction of any new parameters. Demidov’s model involves an additional fitting parameter, but can be applied to more heterogeneous media as well. 相似文献
185.
L. Mahrt Christoph K. Thomas Andrey A. Grachev P. Ola G. Persson 《Boundary-Layer Meteorology》2018,169(3):373-393
Flow in the stable boundary layer is examined at four contrasting sites with greater upwind surface roughness. The surface heterogeneity is disorganized and in some cases weak as commonly occurs. With low wind speeds, the vertical divergence (or convergence) of the momentum and heat fluxes can be large near the surface in what is normally assumed to be the surface layer where such divergence is neglected. For the two most heterogeneous sites, a shallow “new” boundary layer is captured by the tower observations, analogous to an internal boundary layer but more complex. Above the new boundary layer, the magnitudes of the downward fluxes of heat and momentum increase with height in a transition layer, reach a maximum, and then decrease with height in an overlying regional boundary layer. Similar structure is observed at the site with rolling terrain where the shallow new boundary layer at the surface is identified as cold-air drainage generated by the local slope above which the flow undergoes transition to an overlying regional flow. Significant flux divergence near the surface is generated even over an ice floe for low wind speeds and in a shallow Ekman layer that forms during the polar night. For higher wind speeds, the magnitude of the downward fluxes decreases gradually with height at all levels as in a traditional boundary layer. 相似文献
186.
Phase relations on the diopside-jadeite-hedenbergite join up to 24 GPa and stability of Na-bearing majoritic garnet 总被引:1,自引:0,他引:1
Andrey V. Bobrov Hiroshi Kojitani Yuriy A. Litvin 《Geochimica et cosmochimica acta》2008,72(9):2392-2408
Phase relations on the diopside (Di)-hedenbergite (Hd)-jadeite (Jd) system modeling mineral associations of natural eclogites were studied for the compositions (mol %) Di70Jd30, Di50Jd50, Di30Jd70, Di20Hd80, and Di40Hd10Jd50 using a toroidal anvil-with-hole (7 GPa) and a Kawai-type 6-8 multianvil apparatus (12-24 GPa). We established that Di, Hd, and Jd form complete series of solid solutions at 7 GPa, and melting temperatures of pure Di (1980 °C) and Jd (1870 °C) for that pressure were estimated experimentally. The melting temperature for the Di50Jd50 composition at 15.5 GPa is 2270 °C. The appearance of garnet is clearly dependent on initial clinopyroxene composition: at 1600 °C the first garnet crystals are observed at 13.5 GPa in the jadeite-rich part of the system (Di30Jd70), whereas diopside-rich starting material (Di70Jd30) produces garnet only above 17 GPa. The proportion of garnet increases rapidly above 18 GPa as pyroxene dissolves in the garnet structure and pyroxene-free garnetites are produced from diopside-rich starting materials. In all experiments, garnet coexists with stishovite (St). At a pressure above 18 GPa, pyroxene is completely replaced by an assemblage of majorite (Maj) + St + CaSiO3-perovskite (Ca-Pv) in Ca-rich systems, whereas Maj is associated with almost pure Jd up to a pressure of 21.5 GPa. Above ∼22 GPa, Maj, and St are associated with NaAlSiO4 with calcium ferrite structure (Cf). We established that an Hd component also spreads the range of pyroxene stability up to 20 GPa. In the Di70Jd30 system at 24 GPa an assemblage of Maj + Ca-Pv + MgSiO3 with ilmenite structure (Mg-Il) was obtained. The experimentally established correlation between Na, Si, and Al contents in Maj and pressure in Grt(Maj)-pyroxene assemblages, may be the basis for a “majorite” geobarometer. The results of our experiments are applicable to the upper mantle and the transition zone of the Earth (400-670 km), and demonstrate a wide range of transformations from eclogite to perovskite-bearing garnetite. In addition, the mineral associations obtained from the experiments allowed us to simulate parageneses of inclusions in diamonds formed under the conditions of the transition zone and the lower mantle. 相似文献
187.
188.
Dorman Clive E. Grachev Andrey A. Gultepe Ismail Fernando Harindra J. S. 《Boundary-Layer Meteorology》2021,181(2-3):167-170
Boundary-Layer Meteorology - 相似文献
189.
Grachev Andrey A. Krishnamurthy Raghavendra Fernando Harindra J. S. Fairall Christopher W. Bardoel Stef L. Wang Sen 《Boundary-Layer Meteorology》2021,181(2-3):423-424
Boundary-Layer Meteorology - 相似文献
190.
Bhattacharjee Soumak Mortikov Evgeny Debolskiy Andrey Kadantsev Evgeny Pandit Rahul Vesala Timo Sahoo Ganapati 《Boundary-Layer Meteorology》2022,185(2):259-276
Boundary-Layer Meteorology - We characterize the turbulent flow, using direct numerical simulations (DNS), within a closed channel between two parallel walls with a canopy of constant areal density... 相似文献