全文获取类型
收费全文 | 820篇 |
免费 | 56篇 |
国内免费 | 17篇 |
专业分类
测绘学 | 19篇 |
大气科学 | 43篇 |
地球物理 | 253篇 |
地质学 | 297篇 |
海洋学 | 118篇 |
天文学 | 94篇 |
综合类 | 6篇 |
自然地理 | 63篇 |
出版年
2024年 | 2篇 |
2023年 | 1篇 |
2022年 | 9篇 |
2021年 | 27篇 |
2020年 | 19篇 |
2019年 | 21篇 |
2018年 | 27篇 |
2017年 | 35篇 |
2016年 | 50篇 |
2015年 | 30篇 |
2014年 | 45篇 |
2013年 | 46篇 |
2012年 | 34篇 |
2011年 | 55篇 |
2010年 | 50篇 |
2009年 | 60篇 |
2008年 | 60篇 |
2007年 | 38篇 |
2006年 | 36篇 |
2005年 | 39篇 |
2004年 | 27篇 |
2003年 | 14篇 |
2002年 | 26篇 |
2001年 | 12篇 |
2000年 | 9篇 |
1999年 | 14篇 |
1998年 | 21篇 |
1997年 | 11篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 9篇 |
1993年 | 8篇 |
1991年 | 3篇 |
1990年 | 6篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 8篇 |
1986年 | 1篇 |
1985年 | 5篇 |
1984年 | 7篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有893条查询结果,搜索用时 15 毫秒
891.
892.
Luis M. Farfán Eurico J. D’Sa Kam-biu Liu Victor H. Rivera-Monroy 《Estuaries and Coasts》2014,37(6):1388-1402
Tropical cyclones (TCs) are large-scale natural disturbances that generate strong winds and heavy rainfall, impacting coastal and inland environments. TCs also influence biogeochemical and hydrological cycles controlling aquatic primary productivity in tropical and subtropical coastal ecosystems. We assessed TC landfall activity and identified sites along the Mexican east and west coasts with high frequency in the period 1970–2010 and evaluated TCs with significant precipitation. Changes in chlorophyll-a (Chl-a) concentrations before and after storm impacts were estimated using remotely sensed ocean color. There were 1,065 named TCs with a wide diversity in tracks. Three states with the highest number of landfalls were identified: Baja California Sur and Sinaloa on the west coast and Quintana Roo on the east coast. While a relative increase in Chl-a values following TC landfalls in the Baja California and Yucatán Peninsula regions appeared to be strongly linked to TC strength, the intensity of precipitation, the spatial scales of the two peninsulas, and the relative movement of TCs appeared to have contributed to Chl-a variability. Satellite estimates of Chl-a in the nearshore coastal waters following TC passage were likely enhanced by coastal morphology and water discharge along with constituents such as suspended particulate, colored dissolved organic matter and nutrients from rivers, tributaries, and groundwater. 相似文献
893.
Cleivison Souza de Jesus Andre Luis Batista Ribeiro Christine Cordula Dantas 《Astronomische Nachrichten》2024,345(1):e220081
In this work, we study how to improve well-known techniques for detecting progenitors/descendants of galaxies, such as the NDpredict program, when applied to galaxies in clusters. The improvement of this particular method is based on the use of the red sequence of galaxies in those environments. Objects close to the red sequence in the color and magnitude diagram are more likely to belong to the cluster. This defines a probability scale which is then combined with the one generated by NDpredict. This procedure is optimized for the study of galaxies in clusters over different epochs. Our main result is that, for a sample composed of clusters, with masses greater than , selected from the IllustrisTNG simulations (namely, the TNG100 runs). In of the cases (i.e., systems), we obtain better performance with the red sequence method in comparison to the original NDpredict, and the average gain obtained is in the identification of descendants for this sample of cluster galaxies. 相似文献