全文获取类型
| 收费全文 | 83篇 |
| 免费 | 0篇 |
专业分类
| 测绘学 | 1篇 |
| 大气科学 | 10篇 |
| 地球物理 | 11篇 |
| 地质学 | 36篇 |
| 海洋学 | 19篇 |
| 综合类 | 1篇 |
| 自然地理 | 5篇 |
出版年
| 2018年 | 1篇 |
| 2017年 | 4篇 |
| 2016年 | 1篇 |
| 2015年 | 3篇 |
| 2013年 | 6篇 |
| 2012年 | 2篇 |
| 2011年 | 3篇 |
| 2010年 | 3篇 |
| 2009年 | 3篇 |
| 2008年 | 2篇 |
| 2007年 | 7篇 |
| 2006年 | 6篇 |
| 2005年 | 5篇 |
| 2004年 | 7篇 |
| 2003年 | 2篇 |
| 2002年 | 7篇 |
| 2001年 | 2篇 |
| 2000年 | 2篇 |
| 1999年 | 1篇 |
| 1998年 | 3篇 |
| 1997年 | 1篇 |
| 1996年 | 4篇 |
| 1993年 | 1篇 |
| 1985年 | 3篇 |
| 1982年 | 1篇 |
| 1981年 | 2篇 |
| 1977年 | 1篇 |
排序方式： 共有83条查询结果，搜索用时 15 毫秒
61.
62.
63.
Climate Dynamics - Precipitation over the tropical Atlantic in 24 atmospheric models is analyzed using an object-based approach, which clusters rainy areas in the models as precipitation objects... 相似文献
64.
To test the hypothesis that manganese- and iron-reducing bacteria in marine sediments respond rapidly to seasonal pulses of fresh organic carbon settling to the sea floor, we amended wet metal oxide?Crich and metal oxide?Cpoor sediments from the Beaufort Sea, Canadian Arctic, with organic carbon in the form of shrimp powder and incubated them at room temperature. Neither Mn nor Fe was released to the aqueous phase from unamended metal oxide?Crich sediment during a 41-day incubation, but both elements were released from sediment aliquots amended with organic carbon. Dissolved Mn appeared in the aqueous phase after a lag period of 2 days or less and reached levels as high as 600 ??mol l?1 before levelling out. The release of dissolved Mn was accompanied by a decrease in the concentration of solid-phase reducible Mn. Dissolved Fe did not appear until 2 weeks into the incubation and only after the concentration of dissolved Mn had levelled out. For low concentrations of amended organic carbon (0.3%), the kinetics of Mn reduction fit a second-order rate law with a rate constant k = 2 × 10?3 g ??mol?1 day?1, but at intermediate and high organic carbon concentrations (0.7 and 1.3%), the reduction kinetics was better described by a pseudo-first-order rate law with a rate constant k?? = 1.6 × 10?1 day?1. A pulse of organic carbon settling to the sea floor can trigger reduction of Mn and Fe oxides within a few days in strongly seasonal sedimentary environments, such as in the Arctic. 相似文献
65.
Milton J. Porsani Bjorn Ursin Michelângelo G. Silva Paulo E. M. Melo 《Geophysical Prospecting》2013,61(1):42-52
We present a singular value decomposition (SVD) filtering method for the enhancement of coherent reflections and for attenuation of noise. The method is applied in two steps. First normal move‐out (NMO) correction is applied to shot or CMP records, with the purpose of flattening the reflections. We use a spatial SVD filter with a short sliding window to enhance coherent horizontal events. Then the data are sorted in common‐offset panels and the local dip is estimated for each panel. The next SVD filtering is performed on a small number of traces and a small number of time samples centred around the output sample position. Data in a local window are corrected for linear moveout corresponding to the dips before SVD. At the central time sample position, we sum over the dominant eigenimages of a few traces, corresponding to SVD dip filtering. We illustrate the method using land seismic data from the Tacutu basin, located in the north‐east of Brazil. The results show that the proposed method is effective and is able to reveal reflections masked by ground‐roll and other types of noise. 相似文献
66.
67.
68.
69.
70.