全文获取类型
收费全文 | 16584篇 |
免费 | 503篇 |
国内免费 | 38篇 |
专业分类
化学 | 8761篇 |
晶体学 | 127篇 |
力学 | 421篇 |
数学 | 3352篇 |
物理学 | 4464篇 |
出版年
2022年 | 111篇 |
2021年 | 211篇 |
2020年 | 239篇 |
2019年 | 257篇 |
2018年 | 296篇 |
2017年 | 304篇 |
2016年 | 595篇 |
2015年 | 541篇 |
2014年 | 637篇 |
2013年 | 1150篇 |
2012年 | 858篇 |
2011年 | 995篇 |
2010年 | 670篇 |
2009年 | 554篇 |
2008年 | 697篇 |
2007年 | 586篇 |
2006年 | 548篇 |
2005年 | 343篇 |
2004年 | 383篇 |
2003年 | 323篇 |
2002年 | 323篇 |
2001年 | 222篇 |
2000年 | 265篇 |
1999年 | 192篇 |
1998年 | 200篇 |
1997年 | 177篇 |
1996年 | 184篇 |
1995年 | 170篇 |
1994年 | 151篇 |
1993年 | 167篇 |
1992年 | 155篇 |
1991年 | 131篇 |
1990年 | 146篇 |
1989年 | 125篇 |
1988年 | 139篇 |
1987年 | 142篇 |
1986年 | 127篇 |
1985年 | 176篇 |
1984年 | 189篇 |
1983年 | 128篇 |
1982年 | 146篇 |
1981年 | 164篇 |
1980年 | 154篇 |
1979年 | 155篇 |
1978年 | 153篇 |
1977年 | 148篇 |
1976年 | 164篇 |
1975年 | 160篇 |
1974年 | 155篇 |
1973年 | 120篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Lubomír Kubáček 《Applications of Mathematics》2006,51(6):565-582
Some remarks to problems of point and interval estimation, testing and problems of outliers are presented in the case of multivariate
regression model.
This work was supported by the Council of Czech Government J14/98:153100011. 相似文献
22.
Eduard Prugovečki 《Foundations of Physics》1991,21(1):93-124
The issue of the intrinsic nonlocality of quantum mechanics raised by J. S. Bell is examined from the point of view of the recently developed method of geometro-stochastic quantization and its applications to general relativistic quantum theory. This analysis reveals that a distinction should be made between the topological concept of locality used in formulating relativistic causality and a type of geometric locality based on the concept of fiber bundle, which can be used in extending the strong equivalence principle to the quantum domain. Both play an essential role in formulating a notion of geometro-stochastic propagation based on quantum diffusions, which throws new light on the EPR paradox, on the origin of the arrow of time, and on other fundamental issues in quantum cosmology and the theory of measurement. 相似文献
23.
24.
The variational approach based on the covariant quantization method for the curved Einstein space is applied. 相似文献
25.
We predict ultraslow collapse of “tubular image states” (TIS) on material surfaces. TIS are bound Rydberg-like electronic states formed at large distances (∼30 nm) from the surfaces of suspended circularly-symmetric nanowires, such as metallic C nanotubes. The states are formed in potential wells, resulting from a combination of the TIS-electron attraction to image charges in the nanotube and its centrifugal repulsion, caused by spinning around the tube. We demonstrate that TIS can collapse on the tube surface by passing their angular momentum l to circularly polarized flexural phonons excited in the tube. Our analysis shows that for highly detached TIS with l ? 6 the relaxation lifetimes are of the order of 10 ns-1 μs, while for l < 6 these lifetimes are reduced by several orders of magnitude. 相似文献
26.
27.
S. B. Ellis S. J. Kiehl W. S. Hughes K. Schwabe W. C. Gardiner H. L. Sanders H. Yoshimura Hanna Jablezynska-Jedrzewska J. Domański W. A. Dorfman P. Nylén Barbara Stone F. Hovorka W. C. Dearing E. Biilmann W. Kordatzki P. Wulff G. Florence A. Drilhon P. Szigeti O. Tomiček F. Poupě O. Redlich W. Stricks 《Analytical and bioanalytical chemistry》1937,111(2-4):94-104
28.
V. Balek T. Mitsuhashi I.M. Bountseva H. Haneda Z. Malek J. Šubrt 《Journal of Sol-Gel Science and Technology》2003,26(1-3):185-189
The diffusion structural analysis (DSA) was used to characterize microstructure changes of hydrous titania gel films under in situ conditions of heating. TG and DTA were used in order to elucidate the processes controlling the formation of anatase film during heating of hydrous titania gel film. The annealing of porosity and near surface structure defects of the dehydrated titania films was indicated by DSA in the temperature range 255–700°C as the decrease of radon release rate. It was demonstrated that the annealing was enhanced on heating in oxygen in comparison with heating in argon. The DSA experimental results were compared with model curves describing the radon diffusion mobility and the annealing of radon diffusion paths. 相似文献
29.
30.
Veličković Jelena Đ. Andrić Deana Roglić Goran Tešic Živoslav Lj. Milojković-Opsenica Dušanka M. 《平面色谱法杂志一现代薄层色谱法》2004,17(4):255-260
JPC – Journal of Planar Chromatography – Modern TLC - The chromatographic behavior of fourteen 1-arylpiperazine derivatives has been studied by thin-layer chromatography on both silica... 相似文献