全文获取类型
收费全文 | 77篇 |
免费 | 1篇 |
专业分类
大气科学 | 2篇 |
地球物理 | 11篇 |
地质学 | 6篇 |
海洋学 | 10篇 |
天文学 | 43篇 |
自然地理 | 6篇 |
出版年
2018年 | 1篇 |
2014年 | 2篇 |
2011年 | 4篇 |
2009年 | 4篇 |
2008年 | 6篇 |
2007年 | 5篇 |
2006年 | 5篇 |
2005年 | 2篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1983年 | 2篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 4篇 |
排序方式: 共有78条查询结果,搜索用时 31 毫秒
31.
Soline Hallier Emmanuel Chaljub Michel Bouchon Haruko Sekiguchi 《Pure and Applied Geophysics》2008,165(9-10):1751-1760
The basin edge effect, i.e., the interference of the direct S wave with the surface wave diffracted off the basin edge has been invoked by many authors to explain the damage distribution during the January 17, 1995 Hyogo-Ken Nanbu (Kobe) earthquake. Here we present the results of numerical experiments obtained with the spectral element method in 2-D geometry. Our results confirm that the amplification of horizontal motion close to the basin edge can be twice as large as the one measured in the center of the basin. This additional amplification is shown to depend strongly on the edge geometry and on frequency, due to physical dispersion of diffracted surface waves. In particular we obtain maximal amplification around 3 Hz, at frequencies critical for buildings. 相似文献
32.
Naosuke Sekiguchi 《Earth, Moon, and Planets》1972,5(3-4):368-389
The results of the photometric and polarimetric observation of the Moon's surface with high resolution from October 1969 to March 1971 are discussed. It is found that, for a wide part of the Moon's illuminated surface, the brightnessm, expressed by visual magnitude per square second of arc, can be expressed as $$m = 5.0 - 2.5\log H + 2.5\log \{ {{P_v } \mathord{\left/ {\vphantom {{P_v } P}} \right. \kern-\nulldelimiterspace} P}(\alpha )\} ,$$ whereH is the variable part of Hapke's formula,P v is the observed polarization degree, andP(α) is a function of the phase angleα. The color shows a tendency to reddening at the enhancement of the lunar brightness, and this is expressed by the relation $$B - V = - 0.2\Delta m + 1.7,$$ where Δm =m + 2.5 logH which is a sort of residual from the brightness calculated by Hapke's formula. Remarkable enhancements of the lunar brightness correspond to solar flares which appeared just before the observations. Because of this the above formula for the observed brightness can be interpreted by assuming the luminescence on the lunar surface stimulated by the solar activity. 相似文献
33.
34.
Phyllosoma larvae collected to date in Japanese and Taiwanese waters have been classified into two genera (Linuparus, Panulirus) of the Palinuridae, four genera (Ibacus, Parribacus, Scyllarides, Scyllarus) of the Scyllaridae, and one genus (Palinurellus) of the Synaxidae. However, phyllosoma larvae of three Scyllarus species (S. bicuspidatus, S. cultrifer, S. kitanoviriosus) are absolutely dominant among the larvae collected in the waters. Scyllarus larvae are abundant in coastal waters while those of Panulirus are often collected in offshore/oceanic waters. Based on previous and ongoing studies dealing with spatial distributions
of phyllosoma larvae in Japanese and Taiwanese waters, it appears that phyllosoma and nisto larvae of the Scyllarus are retained within coastal waters north of the Kuroshio Current. On the other hand, the life history of the Panulirus (particularly P. japonicus) may be completed within the Kuroshio Subgyre: their phyllosoma larvae may be flushed out from coastal waters into the Kuroshio,
then transported through the Counter Current south of the Kuroshio into the water east of Ryukyu Archipelago and Taiwan where
they attain the subfinal/final phyllosoma or puerulus stages, once again entering the Kuroshio and dispersing into coastal
waters.
This revised version was published online in July 2006 with corrections to the Cover Date.
An erratum to this article is available at . 相似文献
35.
I. A. Bond N. J. Rattenbury J. Skuljan F. Abe R. J. Dodd J. B. Hearnshaw M. Honda J. Jugaku P. M. Kilmartin A. Marles K. Masuda Y. Matsubara Y. Muraki T. Nakamura G. Nankivell S. Noda C. Noguchi K. Ohnishi M. Reid To. Saito H. Sato M. Sekiguchi D. J. Sullivan T. Sumi M. Takeuti Y. Watase S. Wilkinson R. Yamada T. Yanagisawa P. C. M. Yock 《Monthly notices of the Royal Astronomical Society》2002,333(1):71-83
A search for extrasolar planets was carried out in three gravitational microlensing events of high magnification, MACHO 98–BLG–35 , MACHO 99–LMC–2 and OGLE 00–BUL–12 . Photometry was derived from observational images by the MOA and OGLE groups using an image subtraction technique. For MACHO 98–BLG–35 , additional photometry derived from the MPS and PLANET groups was included. Planetary modelling of the three events was carried out in a supercluster computing environment. The estimated probability for explaining the data on MACHO 98–BLG–35 without a planet is <1 per cent. The best planetary model has a planet of mass ∼(0.4–1.5)× M Earth at a projected radius of either ∼1.5 or ∼2.3 au. We show how multiplanet models can be applied to the data. We calculate exclusion regions for the three events and find that Jupiter-mass planets can be excluded with projected radii from as wide as about 30 au to as close as around 0.5 au for MACHO 98–BLG–35 and OGLE 00–BUL–12 . For MACHO 99–LMC–2 , the exclusion region extends out to around 10 au and constitutes the first limit placed on a planetary companion to an extragalactic star. We derive a particularly high peak magnification of ∼160 for OGLE 00–BUL–12 . We discuss the detectability of planets with masses as low as Mercury in this and similar events. 相似文献
36.
37.
G.Bayne W.Tobin J. D.Pritchard I.Bond K. R.Pollard S. C.Besier S.Noda T.Sumi T.Yanagisawa M.Sekiguchi M.Honda Y.Muraki M.Takeuti J. B.Hearnshaw P. M.Kilmartin R. J.Dodd D. J.Sullivan P. C. M.Yock 《Monthly notices of the Royal Astronomical Society》2002,331(3):609-614
We present a catalogue of 167 eclipsing binary stars in the Small Magellanic Cloud (SMC) derived from the data base of time-series photometry for 400 000 SMC stars acquired by the Microlensing Observations in Astrophysics (MOA) project during 1997. We print coordinates, ephemerides, magnitudes and light curves for the 35 new detections; similar data and finding charts are available electronically for the whole catalogue. The majority of periods lie within the range 0.4 to 20 d; six systems are possibly eccentric while 14 are probably or certainly so. The majority of the newly identified systems lie in the outer regions of the SMC. 相似文献
38.
39.
Renato Pereira Lopes Francisco Sekiguchi Buchmann 《Journal of South American Earth Sciences》2011,31(1):17-27
Fossils of terrestrial mammals preserved in submarine environment have been recorded in several places around the world. In Brazil such fossils are rather abundant in the southernmost portion of the coast, associated to fossiliferous concentrations at depths up to 10 m. Here is presented a review of such occurrences and the first record of fossils in deeper areas of the continental shelf. The fossils encompass several groups of both extinct and extant mammals, and exhibit several distinct taphonomic features, related to the marine environment. Those from the inner continental shelf are removed and transported from the submarine deposits to the coast during storm events, thus forming large konzentrat-lagerstätte on the beach, called “Concheiros”. The only fossils from deeper zones of the shelf known so far are a portion of a skull, a left humerus and of a femur of Toxodon sp. and a lower right molar of a Stegomastodon waringi, all collected by fishermen at depths around 20 m. The presence of fossils at great depths and distances from the present coastline, without signs of abrasion and far from areas of fluvial discharges does indicate that these remains have not been transported from the continent to the shelf, but have been preserved directly on the area that today correspond to the continental shelf. These remains indicate the existence of large fossiliferous deposits that have developed during periods of sea-level lowstand (glacial maxima) and have been submerged and reworked by the sea-level rise at the end of the last glaciation. 相似文献
40.
Tomoo Ogura Mark J. Webb Masahiro Watanabe F. Hugo Lambert Yoko Tsushima Miho Sekiguchi 《Climate Dynamics》2014,43(5-6):1409-1421
To better understand CFMIP/CMIP inter-model differences in rapid low cloud responses to CO2 increases and their associated effective radiative forcings, we examined the tropospheric adjustment of the lower tropospheric stability (LTS) in three general circulation models (GCMs): HadGEM2-A, MIROC3.2 medres, and MIROC5. MIROC3.2 medres showed a reduction in LTS over the sub-tropical ocean, in contrast to the other two models. This reduction was consistent with a temperature decrease in the mid-troposphere. The temperature decrease was mainly driven by instantaneous radiative forcing (RF) caused by an increase in CO2. Reductions in radiative and latent heating, due to clouds, and in adiabatic and advective heating, also contribute to the temperature decrease. The instantaneous RF in the mid-troposphere in MIROC3.2 medres is inconsistent with the results of line-by-line (LBL) calculations, and thus it is considered questionable. These results illustrate the importance of evaluating the vertical profile of instantaneous RF with LBL calculations; improved future model performance in this regard should help to increase our confidence in the tropospheric adjustment in GCMs. 相似文献