全文获取类型
| 收费全文 | 106篇 |
| 免费 | 0篇 |
专业分类
| 地球物理 | 2篇 |
| 地质学 | 79篇 |
| 海洋学 | 1篇 |
| 自然地理 | 24篇 |
出版年
| 2015年 | 1篇 |
| 2012年 | 2篇 |
| 2010年 | 1篇 |
| 2009年 | 2篇 |
| 2007年 | 2篇 |
| 2005年 | 1篇 |
| 2004年 | 1篇 |
| 2003年 | 1篇 |
| 2002年 | 4篇 |
| 2001年 | 3篇 |
| 2000年 | 2篇 |
| 1999年 | 5篇 |
| 1997年 | 11篇 |
| 1996年 | 1篇 |
| 1995年 | 4篇 |
| 1994年 | 1篇 |
| 1993年 | 3篇 |
| 1992年 | 2篇 |
| 1988年 | 1篇 |
| 1987年 | 1篇 |
| 1982年 | 3篇 |
| 1981年 | 3篇 |
| 1980年 | 2篇 |
| 1979年 | 1篇 |
| 1978年 | 2篇 |
| 1977年 | 2篇 |
| 1976年 | 11篇 |
| 1975年 | 10篇 |
| 1974年 | 8篇 |
| 1973年 | 4篇 |
| 1972年 | 2篇 |
| 1971年 | 5篇 |
| 1970年 | 3篇 |
| 1969年 | 1篇 |
排序方式： 共有106条查询结果，搜索用时 15 毫秒
1.
2.
3.
Several stratigraphic sequences in the Upper Carboniferous (Pennsylvanian) in Kansas (Midcontinent, USA) were analyzed quantitatively for periodic repetitions. The sequences were coded by lithologic type into strings of datasets. The strings then were analyzed by an adaptation of a one-dimensional Fourier transform analysis and examined for evidence of periodicity. The method was tested using different states in coding to determine the robustness of the method and data. The most persistent response is in multiples of 8–10 ft (2.5–3.0 m) and probably is dependent on the depositional thickness of the original lithologic units. Other cyclicities occurred in multiples of the basic frequency of 8–10 with persistent ones at 22 and 30 feet (6.5–9.0 m) and large ones at 80 and 160 feet (25–50 m). These levels of thickness relate well to the basic cyclothem and megacyclothem as measured on outcrop. We propose that this approach is a suitable one for analyzing cyclic events in the stratigraphic record. 相似文献
4.
5.
J. B. Merriam 《Geophysical Journal International》1994,119(2):369-380
6.
Geophysical analysis of zonal tidal signals in length of day 总被引：5，自引：0，他引：5
Benjamin Fong Chao James B. Merriam Yoshiaki Tamura 《Geophysical Journal International》1995,122(3):765-775
7.
8.
Thematic maps can be analyzed by multiple regression for (1) forward prediction where a younger geological structural map is written as a least-squares function of older maps for information on historical perspectives or (2) by backward prediction where an older map is regressed stepwise on a series of younger ones to aid in prospecting. The technique was evaluated by a series of structure maps on different geological horizons from the U.S. Midcontinent (Kansas) where the forward prediction proved more effective than backward. In forward prediction, the first map entered into a multiple regression is invariably the immediately underlying one as expected. On the other hand, the first map in a backward prediction is not necessarily related to stratigraphy which limits the utility of the technique for prospecting. 相似文献
9.
An ephemeris for gravity tide predictions at the nanogal level 总被引：3，自引：0，他引：3
J. B. Merriam 《Geophysical Journal International》1992,108(2):415-422
10.
R. H. Wimble J. E. Robinson R. A. Reyment F. Demirmen D. F. Merriam 《Mathematical Geology》1976,8(5):589-596