全文获取类型
收费全文 | 1229篇 |
免费 | 309篇 |
国内免费 | 540篇 |
专业分类
测绘学 | 242篇 |
大气科学 | 166篇 |
地球物理 | 243篇 |
地质学 | 754篇 |
海洋学 | 314篇 |
天文学 | 28篇 |
综合类 | 140篇 |
自然地理 | 191篇 |
出版年
2024年 | 7篇 |
2023年 | 30篇 |
2022年 | 77篇 |
2021年 | 90篇 |
2020年 | 85篇 |
2019年 | 109篇 |
2018年 | 99篇 |
2017年 | 88篇 |
2016年 | 65篇 |
2015年 | 96篇 |
2014年 | 89篇 |
2013年 | 133篇 |
2012年 | 134篇 |
2011年 | 143篇 |
2010年 | 118篇 |
2009年 | 109篇 |
2008年 | 114篇 |
2007年 | 96篇 |
2006年 | 88篇 |
2005年 | 68篇 |
2004年 | 65篇 |
2003年 | 38篇 |
2002年 | 43篇 |
2001年 | 34篇 |
2000年 | 24篇 |
1999年 | 9篇 |
1998年 | 6篇 |
1997年 | 2篇 |
1996年 | 6篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1954年 | 2篇 |
排序方式: 共有2078条查询结果,搜索用时 15 毫秒
1.
Tidal effects on temperature front in the Yellow Sea 总被引:5,自引:0,他引:5
Temperature front (TF) is one of the important features in the Yellow Sea, which forms in spring, thrives in summer, and fades
in autumn as thermocline declines. TF intensity ⋎S
T
⋎ is defined to describe the distribution of TF. Based on the MASNUM wave-tide-circulation coupled model, temperature distribution
in the Yellow Sea was simulated with and without tidal effects. Along 36°N, distribution of TF from the simulated results
are compared with the observations, and a quantitative analysis is introduced to evaluate the tidal effects on the forming
and maintaining processes of the TF. Tidal mixing and the circulation structure adapting to it are the main causes of the
TF.
Supported by the National Basic Research Program of China (No. G1999043809) and the National Science Foundation of China (No.
49736190). 相似文献
2.
Simulation of double cold cores of the 35°N section in the Yellow Sea with a wave-tide-circulation coupled model 总被引:1,自引:0,他引:1
Based on the MASNUM wave-tide-circulation coupled numerical model, the temperature structure along 35°N in the Yellow Sea
was simulated and compared with the observations. One of the notable features of the temperature structure along 35°N section
is the double cold cores phenomena during spring and summer. The double cold cores refer to the two cold water centers located
near 122°E and 125°E from the depth of 30m to bottom. The formation, maintenance and disappearance of the double cold cores
are discussed. At least two reasons make the temperature in the center (near 123°E) of the section higher than that near the
west and east shores in winter. One reason is that the water there is deeper than the west and east sides so its heat content
is higher. The other is invasion of the warm water brought by the Yellow Sea Warm Current (YSWC) during winter. This temperature
pattern of the lower layer (from 30m to bottom) is maintained through spring and summer when the upper layer (0 to 30m) is
heated and strong thermocline is formed. Large zonal span of the 35°N section (about 600 km) makes the cold cores have more
opportunity to survive. The double cold cores phenomena disappears in early autumn when the west cold core vanishes first
with the dropping of the thermocline position.
Supported by the National Basic Research Program of China (No. G1999043809) and the National Science Foundation of China (No.
49736190). 相似文献
3.
4.
5.
6.
7.
海岛和海岸带是国土资源的重要组成部分,提升其综合管理水平对促进沿海地区社会经济和海洋可持续发展具有重要意义。文章以中韩建交30周年和“联合国海洋科学促进可持续发展十年”为契机,通过对中韩无居民海岛及海岸带发展管理现状进行比较研究,探讨中韩两国在发展管理方面的异同和存在的问题。研究结果表明:在无居民海岛方面,中国以《中华人民共和国海岛保护法》为基本制度框架建立管理体系,韩国通过综合立法建立管理体系,海岛不合理利用是两国存在的共性问题;韩国重视无居民海岛的宣传,中国更加重视无居民海岛的分类。在海岸带方面,两国均采取综合管理的方式,但在实施程序上采用不同的方式,韩国由中央政府主导并交由地方政府实施综合管理,中国在综合管理体制下交由地方政府自行主导。基于研究结论,提出有针对性的管理措施和建议,促进两国海洋经济的可持续发展。 相似文献
8.
Amodeloftheformationanddevelopmentofoceanshearwave¥QiaoFangliandZhangQinghua(FirstInstituteofOceanography,stateoceanicAdminis... 相似文献
9.
Instability analysis of three-dimensional ocean shear waves 总被引:1,自引:0,他引:1
Qiao Fangli 《海洋学报(英文版)》1996,15(1):1-8
Instabilityanalysisofthree-dimensionaloceanshearwaves¥QiaoFangli(ReceivedNovember6,1995,acceptedNovember30.1995)Abstract:Base... 相似文献
10.