全文获取类型
| 收费全文 | 321篇 |
| 免费 | 11篇 |
| 国内免费 | 19篇 |
专业分类
| 测绘学 | 1篇 |
| 大气科学 | 2篇 |
| 地球物理 | 18篇 |
| 地质学 | 24篇 |
| 海洋学 | 253篇 |
| 天文学 | 25篇 |
| 综合类 | 7篇 |
| 自然地理 | 21篇 |
出版年
| 2024年 | 1篇 |
| 2023年 | 1篇 |
| 2022年 | 5篇 |
| 2021年 | 2篇 |
| 2020年 | 9篇 |
| 2019年 | 3篇 |
| 2018年 | 5篇 |
| 2017年 | 2篇 |
| 2016年 | 5篇 |
| 2015年 | 3篇 |
| 2014年 | 12篇 |
| 2013年 | 12篇 |
| 2012年 | 8篇 |
| 2011年 | 5篇 |
| 2010年 | 8篇 |
| 2009年 | 10篇 |
| 2008年 | 12篇 |
| 2007年 | 25篇 |
| 2006年 | 38篇 |
| 2005年 | 22篇 |
| 2004年 | 17篇 |
| 2003年 | 20篇 |
| 2002年 | 15篇 |
| 2001年 | 19篇 |
| 2000年 | 12篇 |
| 1999年 | 15篇 |
| 1998年 | 10篇 |
| 1997年 | 9篇 |
| 1996年 | 9篇 |
| 1995年 | 12篇 |
| 1994年 | 9篇 |
| 1993年 | 4篇 |
| 1992年 | 8篇 |
| 1989年 | 1篇 |
| 1988年 | 1篇 |
| 1985年 | 1篇 |
| 1983年 | 1篇 |
排序方式： 共有351条查询结果，搜索用时 31 毫秒
1.
We present observations of a sample of Herbig AeBe stars, as well as the FU Orionis object V1057 Cygni. Our K-band (2.2μm)
observations from the Palomar Testbed Interferometer (PTI) used baselines of 110 m and 85 m, resulting in fringe spacings
of ∼4 mas and 5 mas, respectively. Fringes were obtained for the first time on V1057 Cygnias well as V594 Cas. Additional
measurements were made of MWC147, while upper limits to visibility-squared are obtained for MWC297, HD190073, and MWC614.
These measurements are sensitive to the distribution of warm, circumstellar dust in these sources. If the circumstellar infrared
emission comes from warm dust in a disk, the inclination of the disk to the line of sight implies that the observed interferometric
visibilities should depend upon hour angle. Surprisingly, the observations of Millan-Gabet, Schloerb and Traub (2001)(hereafter
MST) did not show significant variation with hour angle. However, limited sampling of angular frequencies on the sky was possible
with the IOTA interferometer, motivating us to study a subset of their objects to further constrain these systems.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
2.
3.
4.
5.
6.
7.
Abstract. The stomach contents of poor cod, Trisopterus minutus capelanus (Lacepède), were taken at monthly intervals off the eastern coast of the Gulf of Valencia (Spain). A total of 1276 were analyzed to determine diet according to fish size and season. The basic food consists of crustaceans (Mysidacea and Decapoda) and teleosts. Feeding habits varied with size: decapods and fishes were more abundant in the stomachs of larger specimens. Little seasonal variation in food habits was recorded. 相似文献
8.
9.
10.