全文获取类型
| 收费全文 | 82篇 |
| 免费 | 0篇 |
专业分类
| 测绘学 | 4篇 |
| 大气科学 | 3篇 |
| 地球物理 | 4篇 |
| 地质学 | 10篇 |
| 海洋学 | 13篇 |
| 天文学 | 45篇 |
| 自然地理 | 3篇 |
出版年
| 2020年 | 1篇 |
| 2019年 | 1篇 |
| 2017年 | 2篇 |
| 2016年 | 4篇 |
| 2013年 | 2篇 |
| 2011年 | 3篇 |
| 2010年 | 1篇 |
| 2009年 | 4篇 |
| 2008年 | 3篇 |
| 2007年 | 8篇 |
| 2006年 | 5篇 |
| 2005年 | 7篇 |
| 2004年 | 4篇 |
| 2003年 | 6篇 |
| 2002年 | 5篇 |
| 2001年 | 2篇 |
| 2000年 | 6篇 |
| 1999年 | 2篇 |
| 1998年 | 4篇 |
| 1995年 | 1篇 |
| 1993年 | 1篇 |
| 1992年 | 2篇 |
| 1991年 | 1篇 |
| 1990年 | 1篇 |
| 1989年 | 1篇 |
| 1977年 | 1篇 |
| 1969年 | 1篇 |
| 1960年 | 1篇 |
| 1959年 | 1篇 |
| 1958年 | 1篇 |
排序方式： 共有82条查询结果，搜索用时 15 毫秒
61.
David A. Wake Robert C. Nichol Daniel J. Eisenstein Jon Loveday Alastair C. Edge Russell Cannon Ian Smail Donald P. Schneider Ryan Scranton Daniel Carson Nicholas P. Ross Robert J. Brunner Matthew Colless Warrwick J. Couch Scott M. Croom Simon P. Driver José da Ângela Sebastian Jester Roberto de Propris Michael J. Drinkwater Joss Bland-Hawthorn Kevin A. Pimbblet Isaac G. Roseboom Tom Shanks Robert G. Sharp Jon Brinkmann 《Monthly notices of the Royal Astronomical Society》2006,372(2):537-550
62.
A. Lawrence S. J. Warren O. Almaini A. C. Edge N. C. Hambly R. F. Jameson P. Lucas M. Casali A. Adamson S. Dye J. P. Emerson S. Foucaud P. Hewett P. Hirst S. T. Hodgkin M. J. Irwin N. Lodieu R. G. McMahon C. Simpson I. Smail D. Mortlock M. Folger 《Monthly notices of the Royal Astronomical Society》2007,379(4):1599-1617
63.
64.
David A. Wake Ravi K. Sheth Robert C. Nichol Carlton M. Baugh Joss Bland-Hawthorn Matthew Colless Warrick J. Couch Scott M. Croom Roberto De Propris Michael J. Drinkwater Alastair C. Edge Jon Loveday Tsz Yan Lam Kevin A. Pimbblet Isaac G. Roseboom Nicholas P. Ross Donald P. Schneider Tom Shanks Robert G. Sharp 《Monthly notices of the Royal Astronomical Society》2008,387(3):1045-1062
65.
66.
67.
The Hydropunch™ is a stainless steel and Teflon® sampling tool that is capable of collecting a representative ground water sample without requiring the installation of a ground water monitoring well. To collect a sample, the Hydropunch (Patent #4669554) is connected to a small-diameter drive pipe and either driven or pushed hydraulically to the desired sampling depth. As the tool is advanced, it remains in the closed position, which prevents soil or water from entering the Hydropunch. Once the desired sampling depth is obtained, the tool is opened to the aquifer by pulling up the drive pipe approximately 1.5 feet (0.46m). In the open position, ground water can flow freely into the sample chamber of the tool. When the sample chamber is full, the Hydropunch is pulled to the surface. As the tool is retracted, check valves close and trap the ground water in the sample chamber. At the surface the sample is transferred from the Hydropunch to an appropriate sample container. The tool is a fast, inexpensive alternative for collecting ground water samples from a discrete interval. It is excellent for vertical profiling or defining the areal extent of a contaminant plume. 相似文献
68.
The uniformity of concentration of lithophile elements in chondrites—with particular reference to Cs
The paper is in two parts. In the first, the dispersion of concentration of the lithophile elements Li, Na, K, Rb, Mg, Ca, Sr, Ba, Al, Sc, Eu, Si, Ti, Zr, Th and U is examined in chondrites. Where twenty or more analyses have been made, relative deviations have been calculated; these range from 5 to 29 per cent. Some of the variation is clearly due to analytical error and it is concluded that the relative deviations of most, perhaps all, lithophile elements is near the lower limit (5 per cent) of the above range. Such small dispersion of concentration for a wide variety of elements, including Li, K and Mg which are sensitive to fractionation, indicates that chondrites have come from a source with an exceptionally uniform composition. It is concluded further that variation of concentration of a lithophile element in the silicate phase, as distinct from the meteorite as a whole, may be even smaller and that the ratio of one lithophile element to the other lithophile elements may turn out to be extremely small indeed. Analytical data of a very high order of excellence (relative deviation of 1–2 per cent) for all elements are evidently required to estimate such small variations precisely.
The second part of the paper is concerned specifically with caesium. This element has been estimated spectrochemically in K—Rb—Cs fractions obtained by ion exchange techniques from six chondrites and seven specimens of basic rock. In the chondrites, the Cs content (ave. 0.12 p.p.m.) and the K/Cs ratio (ave. 7000) remains constant to within the precision of the method of analysis. The magnitude of the average agrees with that (0.09 p.p.m.) of , and but the small variation of the Cs concentration and of the K/Cs ratio contrasts with their observations as they report large variations (× 30 or more). The K/Cs ratio in the seven basic rocks is fairly uniform (in contrast with granites) and similar in general magnitude to that in the chondrites. 相似文献
69.
70.