全文获取类型
收费全文 | 159篇 |
免费 | 6篇 |
国内免费 | 5篇 |
专业分类
测绘学 | 3篇 |
大气科学 | 16篇 |
地球物理 | 42篇 |
地质学 | 54篇 |
海洋学 | 16篇 |
天文学 | 26篇 |
综合类 | 1篇 |
自然地理 | 12篇 |
出版年
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 7篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 7篇 |
2012年 | 3篇 |
2011年 | 5篇 |
2010年 | 10篇 |
2009年 | 11篇 |
2008年 | 9篇 |
2007年 | 4篇 |
2006年 | 2篇 |
2005年 | 4篇 |
2004年 | 3篇 |
2003年 | 4篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 6篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 5篇 |
1994年 | 9篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1991年 | 1篇 |
1990年 | 4篇 |
1988年 | 7篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1974年 | 1篇 |
1971年 | 1篇 |
1951年 | 1篇 |
排序方式: 共有170条查询结果,搜索用时 15 毫秒
41.
42.
S. L. Shalimov I. A. Nesterov A. M. Vorontsov 《Izvestiya Physics of the Solid Earth》2017,53(2):262-273
Based on the data from the GPS receiving networks in Japan and America which have a high time resolution (2 min), two-dimensional (2D) distributions of the variations in the ionospheric total electron content (TEC) are constructed both close to and far from of the epicenter of the submarine earthquake of March 11, 2011 in Japan. Above the epicenter, a diverging multi-period disturbance appears after the main shock due to the acoustic gravity waves. Far from the epicenter, the wave trains associated with the tsunamigenic atmospheric internal gravity waves are revealed. These atmospheric waves significantly advance the arrival of the tsunami signal initially on the Hawaiian islands and then on the western coast of North America. The presence of the tsunami precursor in the form of atmospheric gravity waves is supported by the numerical calculations and by the analysis of the dispersion relation for the waves in the atmosphere. The detected ionospheric responses close and far from the epicenter can be used in the early tsunami warning systems. 相似文献
43.
Data conflicts in fishery models: incorporating hydroacoustic data into the Prince William Sound Pacific herring assessment model 总被引:2,自引:0,他引:2
44.
45.
G. W. Collins II 《Astrophysics and Space Science》1980,73(2):355-378
The effects of formation of a binary black hole in a dense star cluster are found to have significant effects on the dynamics of the cluster. Tidal destruction of stars captured into bound orbits during the formation of the black hole binary provide a sizeable source of very high temperature thermal radiation as well as a source of radially outward moving clouds of gas. The efficiency of subsequently accreted matter onto the binary components as an energy source is investigated and suggestive evolutionary models of the dynamics of the binary system are presented. Lifetimes of the system are shown to be compatible with contemporary estimates. It is suggested that the high-density cluster core provides a suitable environment for the operation of a number of models for the core of active galactic nuclei. 相似文献
46.
Larissa F. Dobrzhinetskaya Harry W. Green II Alex P. Renfro Krassimir N. Bozhilov Dirk Spengler Herman L. M. van Roermund 《地学学报》2004,16(6):325-330
Our experimental simulations of the exhumation path of mantle peridotites show that high‐temperature (1400 °C) decompression of lherzolite from 14 to 13 and 12 GPa results in exsolution of interstitial blebs of diopside and Mg2SiO4 (wadsleyite) lamellae from majoritic garnet. At lower pressures (from 8 to 5 GPa, at T = 1400 °C) only enstatite exsolves as blebs at garnet boundaries. Continuous high‐temperature decompression from 14 to 7 GPa produces zoned majoritic garnet containing blebs of exsolved pyroxenes inside garnet rims. No intracrystalline precipitation of pyroxene was observed in garnet, although such lamellae are found in some natural garnet peridotites. The explanation appears to be the three orders of magnitude difference in grain size between experimental and natural specimens. Our data suggest that Mg2SiO4 and diopside exsolutions reflect the deepest point of the exhumation path of garnet peridotites, whereas enstatite precipitation may be restricted to garnets with less majoritic component at shallower depths. 相似文献
47.
V. A. Kotov A. B. Severny T. T. Tsap I. G. Moiseev V. A. Efanov N. S. Nesterov 《Solar physics》1983,82(1-2):9-19
All evidence of the solar origin of 160-min period oscillations is collected, and the present state of observations of this oscillation in optical and radio-ranges is considered. The main results are summarized: (a) the 160-min oscillation was observed in 1981 as well as before, (b) an attempt to find a nonradial component with l = 2 has failed, (c) the intensity and circular polarization of radioemission show with statistical significance the presence of this 160-min periodicity.Proceedings of the 66th IAU Colloquium: Problems in Solar and Stellar Oscillations, held at the Crimean Astrophysical Observatory, U.S.S.R., 1–5 September, 1981. 相似文献
48.
D. Javorsek II M. C. Brewer J. B. Buncher E. Fischbach J. T. Gruenwald J. Heim A. W. Hoft T. J. Horan J. L. Kerford M. Kohler J. J. Lau A. Longman J. J. Mattes T. Mohsinally J. R. Newport M. A. Petrelli C. A. Stewart J. H. Jenkins R. H. Lee B. Morreale D. B. Morris R. Mudry D. O’Keefe B. Terry M. A. Silver P. A. Sturrock 《Astrophysics and Space Science》2012,338(1):9-13
A new prediction technique based on logarithmic values is proposed to predict the maximum amplitude (R
m) of a solar cycle from the preceding minimum aa geomagnetic index (aa
min). The correlation between lnR
m and lnaa
min (r=0.92) is slightly stronger than that between R
m and aa
min (r=0.90). From this method, cycle 24 is predicted to have a peak size of R
m(24)=81.7(1±13.2%). If the suggested error in aa (3 nT) before 1957 is corrected, the correlation coefficient between R
m and aa
min (r=0.94) will be slightly higher, and the peak of cycle 24 is predicted much lower, R
m(24)=52.5±13.1. Therefore, the prediction of R
m based on the relationship between R
m and aa
min depends greatly on the accurate measurement of aa. 相似文献
49.
Charles E. Konrad II 《自然地理学》2013,34(3):227-248
Synoptic data associated with a sample of 554 heavy rainfall events is utilized to carry out a trajectory analysis that identifies the movements of moisture towards regions of heavy rain. Both seasonal and regional variations are found in the moisture trajectories associated with heavy rain events occurring in three regions in the Appalachian study area. Numerous events in the region west of the mountain range are tied to westerly and south-southwesterly circulations that bring moisture from the Mississippi River Valley and the Gulf of Mexico during the warm and cool seasons, respectively. Many events southeast of the mountain range are associated with southerly to southeasterly circulations that advect moisture from the Atlantic Ocean. Because of orographic precipitation enhancement and a good exposure to the Gulf of Mexico and the Atlantic Ocean, the southern and southeastern slopes of the Appalachian mountains display high frequencies of heavy rainfall, particularly during the cool season. The interior portions of the mountain range and the adjacent plateau to the northwest, on the other hand, are sheltered from moisture source regions and, therefore, exhibit low heavy rain frequencies. [Key words: precipitation, synoptic climatology, Appalachia.] 相似文献
50.
In a small watershed underlain by relatively homogeneous (nonlayered), sandy, glacial outwash, hydraulic conductivity (K) and longitudinal dispersivity (α L) were systematically measured over a range in scale. Test methods employed in the investigation are conventional and/or based on accepted principles, measurement scales are those typically encountered in applied field problems, and the hydrogeologic setting is typical of large areas within the northern hemisphere and similar to many alluvial environments worldwide. The results show that K measured under radial flow is scale-dependent up to a radius of influence (r i) of approximately 15 m but reaches an asymptotic value above this threshold. This asymptotic value of K is consistent with results obtained at the regional scale (~104 m) for the same aquifer using non-radial three-dimensional techniques; the initial increase appears to reflect increasing dimensionality of the radial tests with larger r i. Although α L was evaluated over a much smaller interval relative to K, α L proved to be independent of scale over the full range tested, from 2 to 29 m, an unexpected result. The findings support the idea that there is, as yet, no predictable relationship between scale effects in K and α L at scales normally encountered in applied field hydrogeology. 相似文献