全文获取类型
收费全文 | 13536篇 |
免费 | 165篇 |
国内免费 | 256篇 |
专业分类
测绘学 | 326篇 |
大气科学 | 724篇 |
地球物理 | 2534篇 |
地质学 | 5493篇 |
海洋学 | 1511篇 |
天文学 | 2530篇 |
综合类 | 79篇 |
自然地理 | 760篇 |
出版年
2023年 | 135篇 |
2022年 | 893篇 |
2021年 | 1223篇 |
2020年 | 1100篇 |
2019年 | 1169篇 |
2018年 | 569篇 |
2017年 | 350篇 |
2016年 | 209篇 |
2015年 | 184篇 |
2014年 | 147篇 |
2013年 | 329篇 |
2012年 | 218篇 |
2011年 | 385篇 |
2010年 | 349篇 |
2009年 | 471篇 |
2008年 | 281篇 |
2007年 | 281篇 |
2006年 | 254篇 |
2005年 | 210篇 |
2004年 | 419篇 |
2003年 | 514篇 |
2002年 | 484篇 |
2001年 | 416篇 |
2000年 | 322篇 |
1999年 | 290篇 |
1998年 | 332篇 |
1997年 | 378篇 |
1996年 | 142篇 |
1995年 | 93篇 |
1994年 | 130篇 |
1993年 | 82篇 |
1992年 | 107篇 |
1991年 | 90篇 |
1990年 | 73篇 |
1989年 | 93篇 |
1988年 | 81篇 |
1987年 | 71篇 |
1986年 | 143篇 |
1985年 | 75篇 |
1984年 | 85篇 |
1983年 | 96篇 |
1982年 | 33篇 |
1981年 | 57篇 |
1980年 | 43篇 |
1978年 | 40篇 |
1977年 | 35篇 |
1975年 | 32篇 |
1974年 | 87篇 |
1973年 | 56篇 |
1972年 | 37篇 |
排序方式: 共有10000条查询结果,搜索用时 968 毫秒
1.
Fayman P. A. Prants S. V. Budyansky M. V. Uleysky M. Yu. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(6):618-631
Izvestiya, Atmospheric and Oceanic Physics - Using the eddy-permitting model, circulation in the Okhotsk Sea and in an adjacent area of the Pacific Ocean is retrospectively simulated from 1991 to... 相似文献
2.
Astronomy Letters - The sensitivity of future far-infrared telescopes, such as Millimetron, will be limited by the confusion noise produced by distant galaxies. We have constructed a model of the... 相似文献
3.
Muryshev K. E. Eliseev A. V. Denisov S. N. Mokhov I. I. Arzhanov M. M. Timazhev A. V. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(3):235-241
Izvestiya, Atmospheric and Oceanic Physics - The phase shift between changes in the global surface temperature Tg and atmospheric CO2 content $${{q}_{{{\text{C}}{{{\text{O}}}_{2}}}}}$$ has been... 相似文献
4.
Natural Resources Research - Recognition of reservoir quality is an important objective in reservoir characterization process. By definition, the quality of a reservoir is described by its... 相似文献
5.
Geomagnetism and Aeronomy - The results of a study of the geoelectric section of the upper layers of the Earth at observation sites in Yakutia via vertical electrical sounding and surface impedance... 相似文献
6.
Garkusha A. S. Polyakov A. V. Timofeev Yu. M. Virolainen Ya. A. Kukharsky A. V. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(9):1244-1248
Izvestiya, Atmospheric and Oceanic Physics - A new technique has been developed to obtain the total ozone content (TOC) under cloudy conditions from the spectra of outgoing thermal IR radiation... 相似文献
7.
Assessment of alternative adsorption models and global sensitivity analysis to characterize hexavalent chromium loss from soil to surface runoff 下载免费PDF全文
We investigate our ability to assess transfer of hexavalent chromium, Cr(VI), from the soil to surface runoff by considering the effect of coupling diverse adsorption models with a two‐layer solute transfer model. Our analyses are grounded on a set of two experiments associated with soils characterized by diverse particle size distributions. Our study is motivated by the observation that Cr(VI) is receiving much attention for the assessment of environmental risks due to its high solubility, mobility, and toxicological significance. Adsorption of Cr(VI) is considered to be at equilibrium in the mixing layer under our experimental conditions. Four adsorption models, that is, the Langmuir, Freundlich, Temkin, and linear models, constitute our set of alternative (competing) mathematical formulations. Experimental results reveal that the soil samples characterized by the finest grain sizes are associated with the highest release of Cr(VI) to runoff. We compare the relative abilities of the four models to interpret experimental results through maximum likelihood model calibration and four model identification criteria (i.e., the Akaike information criteria [AIC and AICC] and the Bayesian and Kashyap information criteria). Our study results enable us to rank the tested models on the basis of a set of posterior weights assigned to each of them. A classical variance‐based global sensitivity analysis is then performed to assess the relative importance of the uncertain parameters associated with each of the models considered, within subregions of the parameter space. In this context, the modelling strategy resulting from coupling the Langmuir isotherm with a two‐layer solute transfer model is then evaluated as the most skilful for the overall interpretation of both sets of experiments. Our results document that (a) the depth of the mixing layer is the most influential factor for all models tested, with the exception of the Freundlich isotherm, and (b) the total sensitivity of the adsorption parameters varies in time, with a trend to increase as time progresses for all of the models. These results suggest that adsorption has a significant effect on the uncertainty associated with the release of Cr(VI) from the soil to the surface runoff component. 相似文献
8.
Novigatsky A. N. Lisitzin A. P. Shevchenko V. P. Klyuvitkin A. A. Kravchishina M. D. Politova N. V. 《Oceanology》2020,60(3):372-383
Oceanology - A new approach has been applied to studying marine sedimentation using dispersed sedimentary material in sediment traps compared to the surface layer of bottom sediments. Based on... 相似文献
9.
Volkov A. V. Galyamov A. L. Savchuk Yu. S. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(12):1528-1536
Izvestiya, Atmospheric and Oceanic Physics - Gravimetric data obtained by the GOCE spacecraft contributes to the development of global models of the deep structure of the Earth’s crust and... 相似文献
10.
Boyarskikh I. G. Agatova A. R. Kulikova A. I. Bakiyanov A. I. Skaptsov M. V. Mazeika J. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(8):805-825
Izvestiya, Atmospheric and Oceanic Physics - Areas with large gradients and anomalous variations in geomagnetic and radiation fields have been revealed and mapped at the northwestern foot of the... 相似文献