全文获取类型
收费全文 | 639篇 |
免费 | 22篇 |
国内免费 | 4篇 |
专业分类
测绘学 | 16篇 |
大气科学 | 44篇 |
地球物理 | 154篇 |
地质学 | 248篇 |
海洋学 | 64篇 |
天文学 | 62篇 |
综合类 | 2篇 |
自然地理 | 75篇 |
出版年
2024年 | 2篇 |
2023年 | 3篇 |
2021年 | 2篇 |
2020年 | 12篇 |
2019年 | 10篇 |
2018年 | 21篇 |
2017年 | 15篇 |
2016年 | 21篇 |
2015年 | 18篇 |
2014年 | 19篇 |
2013年 | 27篇 |
2012年 | 23篇 |
2011年 | 33篇 |
2010年 | 37篇 |
2009年 | 49篇 |
2008年 | 41篇 |
2007年 | 35篇 |
2006年 | 19篇 |
2005年 | 33篇 |
2004年 | 25篇 |
2003年 | 23篇 |
2002年 | 21篇 |
2001年 | 14篇 |
2000年 | 7篇 |
1999年 | 9篇 |
1998年 | 17篇 |
1997年 | 4篇 |
1996年 | 8篇 |
1995年 | 7篇 |
1994年 | 6篇 |
1993年 | 2篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 6篇 |
1986年 | 6篇 |
1985年 | 7篇 |
1984年 | 15篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1973年 | 4篇 |
排序方式: 共有665条查询结果,搜索用时 250 毫秒
291.
Paul F. Schofield Andrew D. Smith J. Frederick W. Mosselmans Hendrik Ohldag Andreas Scholl Simone Raoux Gordon Cressey Barbara A. Cressey Paul D. Quinn Caroline A. Kirk Simon C. Hogg 《Geostandards and Geoanalytical Research》2010,34(2):145-159
This work describes the application of microfocus X-ray absorption spectroscopy (XAS) and X-ray photo-emission electron microscopy (XPEEM) to the study of the complex mineralogical intergrowths within the Santa Catharina meteorite. The Santa Catharina meteorite of this study (BM52283 from the meteorite collection of the Natural History Museum, London, UK) primarily comprises a taenite bulk host phase (Fe:Ni ratio = 70.9 ± 0.8%:29.1 ± 0.8%) with a set of oxide-bearing cloudy zone textured regions (Fe:Ni:O ratio = 40.4 ± 0.3%:49.0 ± 0.7%:10.6 ± 0.8% at the core and Fe:Ni:O ratio = 34.4 ± 1.5%:42.7 ± 0.6%:22.9 ± 1.8% towards the rims) and numerous schreibersite (Fe:Ni:P ratio = 38.6 ± 1.6%:38.4 ± 0.9%:23.0 ± 0.5%) inclusions. Between the schreibersite and the taenite are rims up to 50 μm across of Ni-rich kamacite (Fe:Ni ratio = 93.4 ± 0.4%:6.6 ± 0.5%). No chemical zoning or spatial variations in the Fe and Ni speciation was observed within either the schreibersite or the kamacite phases. The oxide-bearing cloudy zone textured regions mostly comprise metallic Fe–Ni alloy, predominantly tetrataenite. Within the oxide phases, the Fe is predominantly, but not entirely, tetrahedrally co-ordinated Fe3+ and the Ni is octahedrally co-ordinated Ni2+. Structural analysis supports the suggestion that non-stoichiometric Fe2NiO4 trevorite is the oxide phase. The trevorite:tetrataenite ratio increases at the edges of the oxide-bearing cloudy zone textured regions indicating increased oxidation at the edges of these zones. The spatial resolution of the XPEEM achieved was between 110 and 150 nm, which precluded the study of either the previously reported ∼ 10 nm precipitates of tetrataenite within the bulk taenite or any antitaenite. 相似文献
292.
293.
294.
295.
Barbara Cunow 《Astrophysics and Space Science》2003,284(2):743-746
Near-infrared and optical colour gradients of the discs of non-active and active spiral galaxies are investigated by using
disc scalelengths. The measurements indicate that the colour gradients for JHK′ are small and no significant differences exist between the non-active and the active galaxies. This result is different from
what is found for the optical wavelength regions, where significant colour gradients are observed in the discs of the non-active
galaxies, but not in the discs of the active ones. This indicates that the differences between non-active and active galaxies
found in the optical do not exist in the near-infrared.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
296.
Janusz Sylwester Zbigniew Kordylewski Stefan Płocieniak Marek Siarkowski Mirosław Kowaliński Stanisław Nowak Witold Trzebiński Marek Śtęślicki Barbara Sylwester Eugeniusz Stańczyk Ryszard Zawerbny Żaneta Szaforz Kenneth J. H. Phillips František Fárník Anatolyi Stepanov 《Solar physics》2015,290(12):3683-3697
297.
We measured seasonal variations in microzooplankton grazing in Long Island Sound (LIS) and San Francisco Bay (SFB). There
was consistent evidence of nutrient limitation in LIS, but not SFB. We found higher chlorophyll a concentrations in LIS compared with SFB. In spite of differences in phytoplankton, there were no differences in microzooplankton
abundance (summer: LIS, 12.4 ± 1.8 × 103 indiv. L−1; SFB, 14.1 ± 3.0 × 103 indiv. L−1), biomass (summer: LIS, 30.4 ± 5.0 μg C L−1; SFB, 26.3 ± 5.9 μg C L−1), or grazing rates (summer: LIS, 0.66 ± 0.19 day−1; SFB, 0.65 ± 0.18 day−1) between the two estuaries. In common with many other investigators, we found many instances of saturated as well as insignificant
grazing. We suggest that saturation in some cases may result from high particle loads in turbid estuarine systems and that
insignificant grazing may result from extreme saturation of the grazing response due to the need to process non-food particles. 相似文献
298.
Permeability–porosity relationships for sediments from the northern Barbados, Costa Rica, Nankai, and Peru subduction zones were examined based on sediment type, grain size distribution, and general mechanical and chemical compaction history. Greater correlation was observed between permeability and porosity in siliciclastic sediments, diatom oozes, and nannofossil chalks than in nannofossil oozes. For siliciclastic sediments, grouping of sediments by percentage of clay-sized material yields relationships that are generally consistent with results from other marine settings and suggests decreasing permeability as percentage of clay-sized material increases. Correction of measured porosities for smectite content improved the correlation of permeability–porosity relationships for siliciclastic sediments and diatom oozes. The relationship between permeability and porosity for diatom oozes is very similar to the relationship in siliciclastic sediments, and permeabilities of both sediment types are related to the amount of clay-size particles. In contrast, nannofossil oozes have higher permeability values by 1.5 orders of magnitude than siliciclastic sediments of the same porosity and show poor correlation between permeability and porosity. More indurated calcareous sediments, nannofossil chalks, overlap siliciclastic permeabilities at the lower end of their measured permeability range, suggesting similar consolidation patterns at depth. Thus, the lack of correlation between permeability and porosity for nannofossil oozes is likely related to variations in mechanical and chemical compaction at shallow depths. This study provides the foundation for a much-needed global database with fundamental properties that relate to permeability in marine settings. Further progress in delineating controls on permeability requires additional carefully documented permeability measurements on well-characterized samples. 相似文献
299.
300.