全文获取类型
收费全文 | 86篇 |
免费 | 8篇 |
国内免费 | 9篇 |
专业分类
测绘学 | 2篇 |
大气科学 | 5篇 |
地球物理 | 30篇 |
地质学 | 29篇 |
海洋学 | 28篇 |
天文学 | 4篇 |
综合类 | 4篇 |
自然地理 | 1篇 |
出版年
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 4篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 1篇 |
2014年 | 5篇 |
2013年 | 2篇 |
2012年 | 7篇 |
2011年 | 4篇 |
2010年 | 7篇 |
2009年 | 3篇 |
2008年 | 9篇 |
2007年 | 9篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1994年 | 5篇 |
1992年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有103条查询结果,搜索用时 0 毫秒
101.
Motomu Toda Masayuki Yokozawa Akihiro Sumida Tsutomu Watanabe Toshihiko Hara 《Carbon balance and management》2007,2(1):6
Background
Changes in the timing of phenological events may cause the annual carbon budget of deciduous forests to change. Therefore, one should take such events into account when evaluating the effects of global warming on deciduous forests. In this article, we report on the results of numerical experiments done with a model that includes a phenological module simulating the timing of bud burst and other phenological events and estimating maximum leaf area index. 相似文献102.
Akihiro Tamura Shoji Arai Satoko Ishimaru Eric S. Andal 《Contributions to Mineralogy and Petrology》2008,155(4):491-509
Peridotite samples recovered from IODP Site U1309 at the Atlantis Massif in the Mid-Atlantic Ridge were examined to understand
magmatic processes for the oceanic core complex formation. Original peridotite was fragmented, and the limited short peridotite
intervals are now surrounded by a huge gabbro body probably formed by late-stage melt injections. Each peridotite interval
has various petrographical and geochemical features. A spinel harzburgite in contact with gabbro shows evidence of limited
melt penetrations causing gradual compositional change, in terms of trace-element compositions of pyroxenes, as well as modal
change near the boundary. Geochemistry of clinopyroxenes with least melt effects indicates that the harzburgite is originally
mantle residue formed by partial melting under polybaric conditions, and that such a depleted peridotite is one of the components
of the oceanic core complex. Some of plagioclase-bearing peridotites, on the other hand, have more complicated origin. Although
their original features were partly overprinted by the injected melt, the original peridotites, both residual and non-residual
materials, were possibly derived from the upper mantle. This suggests that the melt injected around an upper mantle region
or into mantle material fragments. The injected melt was possibly generated at the ridge-segment center and, then, moved and
evolved toward the segment end beneath the oceanic core complex. 相似文献
103.
Livestock wastes as a source of estrogens and their effects on wildlife of Manko tidal flat,Okinawa 总被引:9,自引:0,他引:9
The Manko tidal flat in the southern part of Okinawa Island is an important visiting and wintering area for migratory birds and was added to the Ramsar Convention Register of Wetlands in 1999. This area used to be an inlet extending to the inner part of Naha Port, but recent reclamation projects have restricted its connection to the East China Sea. As is typical in rural regions of subtropical islands, the inhabitants in the Manko basin raise livestock, especially pigs, without employing sufficient waste treatment methods. As sewage treatment works are considered to be one of the main sources of environmental estrogens in urban areas, the significance of livestock farming as a source of estrogens in rural area is examined in this study. In the present study, total estrogenic activities in water and sediment samples from the Manko tidal flat and its basin were measured using a recombinant yeast screen method. Estrogenic activities (equivalent to 17beta-estradiol, E2) were around 10 ng l(-1) in water samples and more than 10 microg kg(-1) in some sediment samples. In addition, the concentrations of estrone (E1) and E2 in water samples measured using LC/MS/MS indicated a high contribution of environmental estrogens from livestock wastes. 相似文献