全文获取类型
收费全文 | 329篇 |
免费 | 9篇 |
国内免费 | 5篇 |
专业分类
测绘学 | 5篇 |
大气科学 | 20篇 |
地球物理 | 90篇 |
地质学 | 90篇 |
海洋学 | 63篇 |
天文学 | 40篇 |
综合类 | 7篇 |
自然地理 | 28篇 |
出版年
2024年 | 1篇 |
2021年 | 2篇 |
2020年 | 4篇 |
2019年 | 9篇 |
2018年 | 9篇 |
2017年 | 5篇 |
2016年 | 22篇 |
2015年 | 7篇 |
2014年 | 8篇 |
2013年 | 19篇 |
2012年 | 8篇 |
2011年 | 13篇 |
2010年 | 13篇 |
2009年 | 17篇 |
2008年 | 28篇 |
2007年 | 11篇 |
2006年 | 30篇 |
2005年 | 15篇 |
2004年 | 15篇 |
2003年 | 6篇 |
2002年 | 7篇 |
2001年 | 11篇 |
2000年 | 5篇 |
1999年 | 5篇 |
1998年 | 14篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1974年 | 2篇 |
1972年 | 1篇 |
排序方式: 共有343条查询结果,搜索用时 15 毫秒
341.
The temporal variation of the partial pressure of carbon dioxide
in surface seawater of Iyo Nada in the western Seto Inland Sea was measured by infrared absorption of carbon dioxide (CO2) in air equilibrated with seawater. The variation of
from January to late May in 1994 was relatively small (from 270 to 340 atm). on the contrary, the
measured in September 1993 ranged from 200 to 450 atm. It seems that the relative high
observed in the north and the south of Iyo Nada in September were caused by destruction of a stratification owing to tidal currents at straits between Hiroshima Bay and Iyo Nada and Hayasui Straits, respectively. The low
observed in the central Iyo Nada in September was ascribed to a tidal front where high concentrations of chlorophyll-a and a relation between
and chlorophyll-a in negative sense were found. Except the observation in the north of Iyo Nada in September, the
in the surface seawater of Iyo Nada were lowe than the atmospheric
(about 367 atm). The results obtained by this work and Kimotoet al. (1993) lead to the conclusion that Iyo Nada acts as a sink of the atmospheric CO2 on the average. 相似文献
342.
Eguchi Takao Fujinawa Yukio Fujita Eisuke Iwasaki Sin-Iti Watabe Isao Fujiwara Hiroyuki 《Marine Geophysical Researches》1998,20(2):73-94
We installed a real-time operating regional observation network of Ocean-Bottom-Seismometers, connected to an electro-optical fiber communication cable, at the Sagami trough subduction zone, just south of the Tokyo metropolitan area, central Japan. The network, called ETMC, has six seismic observation sites at approximately 20 km spacing. In addition, there are three tsunami observation sites along the ETMC network to monitor the propagation process of tsunamis around the Sagami trough region.The on-line data from the ETMC has been improving the detection capability of smaller-magnitude earthquakes even at areas close to the margin of the trough. The ETMC data analyzing system, which has a function of real-time digital filtering for each seismic channel, can read the arrival times of P- and S-waves precisely, constraining well the automatic on-line hypocenter locations. The network has been providing useful information regarding the bending and downgoing process of the Philippine sea plate at the Sagami trough subduction zone.The pressure sensors of the installed network have a detection capability of tsunami wave trains with an amplitude of less than 1 cm. For example, the sensors recorded the full time history of tsunami wave trains, with mm order resolution, originating from a tsunami earthquake with 5.7 MW and the tsunami magnitude of 7.5 occurred near Tori Shima (Tori Is.) of the Izu-Bonin Is. arc on September 4, 1996. The maximum amplitude of the tsunami signals on the trough-floor was approximately 1 cm (P-P), in contrast with approximately 20 cm (0-P) at a coastal site on Izu-Oshima, near the trough. Also, the pressure sensors observed tsunamis due to a large tsunami earthquake (7.1 MW) at the northern New Guinea, on July 17, 1998. 相似文献
343.
Scorpaena onaria Jordan & Snyder (Scorpaeniformes: Scorpaenidae), previously known only from the northwestern Pacific Ocean, is reported from the southwestern Pacific Ocean for the first time on the basis of 19 specimens. The southwestern Pacific specimens are regarded as a southern population of S. onaria, characterised by a shorter supraocular tentacle and larger body size compared with the northwestern Pacific specimens. The southern population is described in detail including comparisons with all known Indo‐Pacific species of the genus Scorpaena. Analyses of 37 measurements of the southern population of S. onaria found that relative orbit diameter and second anal‐fin spine length became significantly smaller with growth. Initially cycloid, the scales enclosed by the posterior tips of the upper and lower opercular spines and opercular margin change to ctenoid with growth at c. 160–170 mm standard length. A mature female differed from an immature female and males in having a longer upper jaw, steeper dorsal profile of the snout, and shorter nasal spine. As a consequence, the species previously reported as S. neglecta from the Andaman Sea and northwestern Australia was re‐identified as S. onaria. 相似文献