全文获取类型
收费全文 | 824篇 |
免费 | 47篇 |
国内免费 | 13篇 |
专业分类
测绘学 | 14篇 |
大气科学 | 45篇 |
地球物理 | 236篇 |
地质学 | 183篇 |
海洋学 | 63篇 |
天文学 | 164篇 |
自然地理 | 179篇 |
出版年
2021年 | 10篇 |
2020年 | 9篇 |
2019年 | 15篇 |
2018年 | 15篇 |
2017年 | 13篇 |
2016年 | 28篇 |
2015年 | 19篇 |
2014年 | 17篇 |
2013年 | 46篇 |
2012年 | 23篇 |
2011年 | 32篇 |
2010年 | 19篇 |
2009年 | 47篇 |
2008年 | 41篇 |
2007年 | 34篇 |
2006年 | 33篇 |
2005年 | 35篇 |
2004年 | 48篇 |
2003年 | 27篇 |
2002年 | 41篇 |
2001年 | 32篇 |
2000年 | 19篇 |
1999年 | 17篇 |
1998年 | 21篇 |
1997年 | 22篇 |
1996年 | 15篇 |
1995年 | 8篇 |
1994年 | 12篇 |
1993年 | 12篇 |
1992年 | 10篇 |
1991年 | 23篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 7篇 |
1987年 | 10篇 |
1986年 | 5篇 |
1985年 | 16篇 |
1984年 | 13篇 |
1983年 | 6篇 |
1982年 | 10篇 |
1981年 | 9篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 9篇 |
1975年 | 8篇 |
1974年 | 3篇 |
1973年 | 4篇 |
1970年 | 3篇 |
1965年 | 2篇 |
1924年 | 2篇 |
排序方式: 共有884条查询结果,搜索用时 15 毫秒
851.
Banks S 《Marine pollution bulletin》2003,47(7-8):325-330
Near daily satellite monitoring of ocean colour using sea viewing wide angle of field viewing sensor (SeaWiFS) allowed the oceanic and near coastal chlorophyll-a distributions to be followed across the Galápagos Marine Reserve (GMR) from space. In the aftermath of the Jessica spill early indications suggested that, compared to the three preceding years 1998-2000, local chlorophyll concentrations over January 2001 were elevated across the Galápagos Marine Reserve [Biological Impacts of the Jessica Oil Spill on the Galápagos Environment: Preliminary Report. Charles Darwin Foundation, Puerto Ayora, Galápagos, Ecuador, 2001]. At the time of the spill the central and eastern extent of the archipelago was experiencing a spatially extensive moderate bloom event (0.5-2.5 mgm(-3) chl-a) extending over the central islands, including the source of the spill and areas of known impact such as the islands of Santa Fé, eastern Santa Cruz and Floreana directly in the advection path.Further investigation shows that chlorophyll across the affected regions of western San Cristóbal, Santa Fé, southeast Santa Cruz, eastern Floreana and eastern Isabela declined in the week directly following the spill event, yet rose in the successive month to levels analogous to preceding years. Although there may have been a localised effect of the spill upon near coast phytoplankton primary production in the short term, the observed variance in the weeks following the spill was not significant in comparison to the normal high variation between years and within the El Ni?o/Southern Oscillation signal. 相似文献
852.
853.
The Propagation of Surface Waves in Anisotropic Media 总被引:4,自引:0,他引:4
854.
855.
Stuart A. Foster 《The Professional geographer》1991,43(2):131-142
Geographic phenomena and our models of them are closely linked to the spatial-temporal contexts in which they are observed. The expansion method is a procedure that incorporates contextual effects into mathematical models. More importantly, it is the basis for a movement by some geographers away from the classical spatial science paradigm. The evolving paradigm associated with the expansion method represents a reformulation of the way in which geographers think about and use models, and is consistent with a more realistic perspective on the nature of geographic inquiry. 相似文献
856.
857.
Stuart J. Weidenschilling 《Icarus》1984,60(3):553-567
In accretion disk models of the solar nebula, turbulence is driven by convective instability. This mechanism requires high opacity, which must be provided by solid grains. Evolution of the grain size distribution in a turbulent disk is computed numerically, using realistic collisional outcomes and strengths of grain aggregates, rather than an arbitrary “sticking efficiency.” The presence of turbulence greatly increases the rate of grain collisions; the coagulation rate is initially much greater than in a nonturbulent disk. Aggregates quickly reach sizes ~0.1–1 cm, but erosion and breakup in collisions prevent growth of larger bodies for plausible aggregate impact strengths. These aggregates are too small to settle to the plane of the disk, and planetesimal formation is impossible as long as the turbulence persists. However, the opacity of the disk is reduced by aggregate formation; some combinations of opacity law and surface density produce an optically thin disk, cutting off turbulent convection. The disk may experience alternating periods of turbulence and quiescence, as grains are depleted by coagulation and replenished by infall from the presolar cloud. Planetesimals can form only during the quiescent intervals; it is argued that such episodes were rare during the lifetime of the accretion disk. 相似文献
858.
Summary. The square-root energy ratios and pulse shapes are presented for P, SV and SH waves transmitted through a layer of orthorhombic olivine between two isotropic half-spaces. Off incident planes of symmetry, incident P waves generate two small amplitude SH waves (one from each interface), whose amplitudes decrease slowly with increasing period. Incident SV (or SH ) waves can generate large amplitude SH (or SV ) waves which decrease rapidly with increasing period. For incident S waves, many pulses not present in isotropic models are generated, often of large relative amplitude, with many of the transmitted S pulses showing evidence of double arrivals, either in the form of S-wave splitting, or a modification of the shape of the input waveform. 相似文献
859.
Each of the Galilean satellites, as well as most other satellites whose initial rotations have been substantially altered by tidal dissipation, has been widely assumed to rotate synchronously with its orbital mean motion. Such rotation would require a small permanent asymmetry in the mass distribution in order to overcome the small mean tidal torque. Since Io and Europa may be substantially fluid, they may not have the strenght to support the required permanent asymmetry. Thus, each may rotate at the unknown but slightly nonsynchronous rate that corresponds to zero mean tidal torque. This behaviour may be observable by Galileo spacecraft imaging. It may help explain the longitudinal variation of volcanism on Io and the cracking of Europa's crust. 相似文献
860.
Stuart G Wakeham 《Marine Chemistry》1985,17(3):213-235
The flux and composition of wax esters and triacylglycerols were measured in particulate matter collected by free-drifting sediment traps in the Peru upwelling area. The purpose was to assess diurnal variations in sources and vertical transport of these lipids. Traps were deployed for periods of 8–12 h during both day and night at the base of the euphotic zone (10–14m) and at about 50m. Although the flux of total particulate organic carbon varied 4×, the flux of wax esters varied by 84× and triacylglycerols by 30×. POC, wax esters, and triacylglycerols also showed different temporal patterns. The highest wax ester flux was measured in shallow traps at night and is attributed to increased inputs from zooplankton which feed near the surface at night. Triacylglycerol flux was high in both shallow and deep nocturnal traps, consistent with inputs of both phytoplankton and zooplankton lipids. The composition of these lipids was also quite variable and attests to the complex nature of the lipid sources. 相似文献