全文获取类型
收费全文 | 203篇 |
免费 | 8篇 |
专业分类
大气科学 | 14篇 |
地球物理 | 102篇 |
地质学 | 46篇 |
海洋学 | 19篇 |
天文学 | 19篇 |
自然地理 | 11篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 6篇 |
2017年 | 4篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 13篇 |
2013年 | 15篇 |
2012年 | 6篇 |
2011年 | 7篇 |
2010年 | 5篇 |
2009年 | 14篇 |
2008年 | 2篇 |
2007年 | 4篇 |
2006年 | 8篇 |
2005年 | 8篇 |
2004年 | 10篇 |
2003年 | 6篇 |
2002年 | 7篇 |
2001年 | 1篇 |
1999年 | 5篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 7篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1991年 | 7篇 |
1990年 | 5篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1981年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1882年 | 1篇 |
排序方式: 共有211条查询结果,搜索用时 15 毫秒
21.
22.
Dave A.Yuen Benjamin J. Kadlec Evan F. Bollig Witold Dzwinel Zachary A. Garbow Cesar R. S. da Silva 《Visual Geosciences》2005,10(1):1-12
We present a web client-server service WEB-IS, which we have developed for remote analysis and visualization of seismic data consisting of both small magnitude events and large earthquakes. We show that the problem-solving environment (PSE) intended for prediction of large magnitude earthquakes can be based on this WEB-IS idea. The clustering schemes, feature generation, feature extraction techniques and rendering algorithms form a computational framework of this environment. On the other hand, easy and fast access both to the seismic data distributed among distant computing resources and to computational and visualization resources can be realized in a GRID framework. We discuss the usefulness of NaradaBrokering (iNtegrated Asynchronous Real-time Adaptive Distributed Architecture) as a middleware, allowing for flexibility and high throughput for remote visualization of geophysical data. The WEB-IS functionality was tested both on synthetic and the actual earthquake catalogs. We consider the application of similar methodology for tsunami alerts. 相似文献
23.
24.
25.
26.
27.
28.
Pascal J. Elahi Robert J. Thacker Lawrence M. Widrow Evan Scannapieco 《Monthly notices of the Royal Astronomical Society》2009,395(4):1950-1962
We explore the dependence of the subhalo mass function on the spectral index n of the linear matter power spectrum using scale-free Einstein-de Sitter simulations with n =−1 and −2.5. We carefully consider finite volume effects that may call into question previous simulations of n < −2 power spectra. Subhaloes are found using a 6D friends-of-friends algorithm in all haloes originating from high-σ peaks. For n =−1 , we find that the cumulative subhalo mass function is independent of the parameters used in the subhalo finding algorithm and is consistent with the subhalo mass function found in Λ cold dark matter (ΛCDM) simulations. In particular, the subhalo mass function is well fit by a power-law with an index of α=−0.9 , that is the mass function has roughly equal mass in subhaloes per logarithmic interval in subhalo mass. Conversely, for n =−2.5 , the algorithm parameters affect the subhalo mass function since subhaloes are more triaxial with less well-defined boundaries. We find that the index α is generally larger with α≳−0.75 . We infer that although the subhalo mass function appears to be independent of n so long as n ≳−2 , it begins to flatten as n →−3 . Thus, the common practice of using α≈−1.0 may greatly overestimate the number of subhaloes at the smallest scales in the CDM hierarchy. 相似文献
29.
Timothy J. Galvin Miroslav D. Filipović Evan J. Crawford Graeme Wong Jeff L. Payne Ain De Horta Graeme L. White Nick Tothill Danica Drašković Thomas G. Pannuti Caleb K. Grimes Benjamin J. Cahall William C. Millar Seppo Laine 《Astrophysics and Space Science》2012,340(1):133-142
A series of new radio-continuum (λ=20 cm) mosaic images focused on the NGC?300 galactic system were produced using archived observational data from the VLA and/or ATCA. These new images are both very sensitive (rms?=60 μJy) and feature high angular resolution (<10?″). The most prominent new feature is the galaxy’s extended radio-continuum emission, which does not match its optical appearance. Using these newly created images a number of previously unidentified discrete sources have been discovered. Furthermore, we demonstrate that a joint deconvolution approach to imaging this complete data-set is inferior when compared to an immerge approach. 相似文献
30.