全文获取类型
收费全文 | 73965篇 |
免费 | 3544篇 |
国内免费 | 3212篇 |
专业分类
化学 | 39802篇 |
晶体学 | 1196篇 |
力学 | 3839篇 |
综合类 | 208篇 |
数学 | 6154篇 |
物理学 | 29522篇 |
出版年
2022年 | 875篇 |
2021年 | 1055篇 |
2020年 | 1102篇 |
2019年 | 1100篇 |
2018年 | 1150篇 |
2017年 | 1143篇 |
2016年 | 1716篇 |
2015年 | 1523篇 |
2014年 | 2085篇 |
2013年 | 3854篇 |
2012年 | 3981篇 |
2011年 | 4704篇 |
2010年 | 3382篇 |
2009年 | 3313篇 |
2008年 | 3987篇 |
2007年 | 3700篇 |
2006年 | 3452篇 |
2005年 | 2916篇 |
2004年 | 2511篇 |
2003年 | 2163篇 |
2002年 | 2101篇 |
2001年 | 3423篇 |
2000年 | 2427篇 |
1999年 | 1825篇 |
1998年 | 1241篇 |
1997年 | 1174篇 |
1996年 | 906篇 |
1995年 | 860篇 |
1994年 | 764篇 |
1993年 | 681篇 |
1992年 | 986篇 |
1991年 | 964篇 |
1990年 | 862篇 |
1989年 | 770篇 |
1988年 | 743篇 |
1987年 | 814篇 |
1986年 | 668篇 |
1985年 | 885篇 |
1984年 | 822篇 |
1983年 | 564篇 |
1982年 | 562篇 |
1981年 | 534篇 |
1980年 | 495篇 |
1979年 | 617篇 |
1978年 | 644篇 |
1977年 | 658篇 |
1976年 | 574篇 |
1975年 | 481篇 |
1974年 | 522篇 |
1973年 | 448篇 |
排序方式: 共有10000条查询结果,搜索用时 765 毫秒
1.
Mazurenko V. V. Kvashnin Y. O. Lichtenstein A. I. Katsnelson M. I. 《Journal of Experimental and Theoretical Physics》2021,132(4):506-516
Journal of Experimental and Theoretical Physics - Dzyaloshinskii–Moriya interaction, DMI in short, represents an antisymmetric type of magnetic interactions that favor orthogonal orientation... 相似文献
2.
3.
Kinetics and Catalysis - The catalytic properties of a nickel phosphide catalyst supported on silica gel in the reductive amination of carbonyl compounds were studied in a flow reactor using... 相似文献
4.
Yang T. L. Kao C. L. Kuo C. E. Yeh H. C. Li W. J. Li H. T. Chen C. Y. 《Chemistry of Natural Compounds》2022,58(5):825-827
Chemistry of Natural Compounds - A novel bibenzyl derivative, hydrangchinenin (1), was isolated from the stems of Hydrangea chinensis Maxim. (Hydrangeaceae). Its structure was determined on the... 相似文献
5.
Kacher Y. G. Karlova M. G. Glukhov G. S. Zhang H. Zaklyazminskaya E. V. Loussouarn G. Sokolova O. S. 《Crystallography Reports》2021,66(5):711-725
Crystallography Reports - Membrane proteins, including ion channels, became the focus of structural proteomics midway through the 20th century. Methods for studying ion channels are diverse and... 相似文献
6.
Kobayashi M. Zhang Y. Ishikawa H. Sun J. Oddershede J. Juul Jensen D. Miura H. 《Experimental Mechanics》2021,61(5):817-828
Experimental Mechanics - The internal strain distribution developing during plastic deformation is important for understanding the mechanical properties of polycrystalline materials. Such... 相似文献
7.
Lebedev D. V. Egorov V. V. Shvetsov A. V. Zabrodskaya Y. A. Isaev-Ivanov V. V. Konevega A. L. 《Crystallography Reports》2021,66(2):242-253
Crystallography Reports - The review describes the application of small-angle scattering (SAS) of neutrons and complementary methods to study the structures of biomacromolecules. Here we cover SAS... 相似文献
8.
A numerical model was developed and validated to investigate the fluid–structure interactions between fully developed pipe flow and core–shell-structured microcapsule in a microchannel. Different flow rates and microcapsule shell thicknesses were considered. A sixth-order rotational symmetric distribution of von Mises stress over the microcapsule shell can be observed on the microcapsule with a thinner shell configuration, especially at higher flow rate conditions. It is also observed that when being carried along in a fully developed pipe flow, the microcapsule with a thinner shell tends to accumulate stress at a higher rate compared to that with a thicker shell. In general, for the same microcapsule configuration, higher flow velocity would induce a higher stress level over the microcapsule shell. The deformation gradient was used to capture the microcapsule's deformation in the present study. The effect of Young's modulus on the microcapsule shell on the microcapsule deformation was investigated as well. Our findings will shed light on the understanding of the stability of core–shell-structured microcapsule when subjected to flow-induced shear stress in a microfluidic system, enabling a more exquisite control over the breakup dynamics of drug-loaded microcapsule for biomedical applications. 相似文献
9.
10.
Li Y. Shi W. H. Dong L. M. Xu S. X. Huang H. J. Yin J. R. 《Journal of Applied Spectroscopy》2022,89(3):534-541
Journal of Applied Spectroscopy - Sr3B2O6:Dy3+, Eu3+ single-matrix white-light-emitting materials are prepared using the high-temperature solid-state method. The microstructure, emission spectrum,... 相似文献