全文获取类型
收费全文 | 518431篇 |
免费 | 3648篇 |
国内免费 | 1177篇 |
专业分类
化学 | 244750篇 |
晶体学 | 7817篇 |
力学 | 28149篇 |
综合类 | 14篇 |
数学 | 75323篇 |
物理学 | 167203篇 |
出版年
2021年 | 4204篇 |
2020年 | 4436篇 |
2019年 | 5138篇 |
2018年 | 12621篇 |
2017年 | 13179篇 |
2016年 | 12471篇 |
2015年 | 5866篇 |
2014年 | 9383篇 |
2013年 | 20797篇 |
2012年 | 18807篇 |
2011年 | 27303篇 |
2010年 | 19231篇 |
2009年 | 19517篇 |
2008年 | 24486篇 |
2007年 | 26750篇 |
2006年 | 16095篇 |
2005年 | 17892篇 |
2004年 | 15096篇 |
2003年 | 14023篇 |
2002年 | 12838篇 |
2001年 | 13914篇 |
2000年 | 10497篇 |
1999年 | 7994篇 |
1998年 | 6818篇 |
1997年 | 6575篇 |
1996年 | 6256篇 |
1995年 | 5488篇 |
1994年 | 5389篇 |
1993年 | 5272篇 |
1992年 | 5646篇 |
1991年 | 6068篇 |
1990年 | 5812篇 |
1989年 | 5788篇 |
1988年 | 5476篇 |
1987年 | 5654篇 |
1986年 | 5298篇 |
1985年 | 6689篇 |
1984年 | 6755篇 |
1983年 | 5703篇 |
1982年 | 5789篇 |
1981年 | 5494篇 |
1980年 | 5300篇 |
1979年 | 5783篇 |
1978年 | 5924篇 |
1977年 | 5889篇 |
1976年 | 5994篇 |
1975年 | 5606篇 |
1974年 | 5543篇 |
1973年 | 5734篇 |
1972年 | 4264篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
973.
E. V. Suchilkina 《Journal of Mathematical Sciences》2007,147(1):6510-6516
At the end of the twentieth century, in mathematical physics, the Knizhnik-Zamolodchikov equations for the root systems A
n
and their generalizations for the root systems of types B
n
, C
n
, and D were constructed. For the root system of type G
2, the vector version of the Knizhnik-Zamolodchikov equations was obtained by M. P. Zamakhovskii and V. P. Leksin. However,
the tensor version of these equations has remained unstudied. In this paper, the Knizhnik-Zamolodchikov equations associated
with the root system of type G
2 are considered.
__________
Translated from Sovremennaya Matematika i Ee Prilozheniya (Contemporary Mathematics and Its Applications), Vol. 38, Suzdal
Conference-2004, Part 3, 2006. 相似文献
974.
975.
A nonlinear pulse systems with a time-variant continuous linear part is considered. A method for synthesizing an output-feedback robust stabilizing control is suggested. 相似文献
976.
977.
A. Puiu G. Giubileo G. Addolorato L. Revelli G. Gasbarrini R. Bellantone A. D’Amore C. P. Lombardi C. Carrozza 《Laser Physics》2007,17(4):448-452
Nowadays, there is high demand for sensitive gas sensors both for human and environmental monitoring. This paper deals with a high-resolution (0.2 ppb) laser-based photoacoustic spectroscopic system realized at ENEA Frascati, Italy, applied for monitoring stress in scuba divers during sustained immersion by analyzing breath samples. Blood tests and psychometric tests for scuba divers were performed at Catholic University in Rome. Results will be reported and discussed. 相似文献
978.
M. I. Kurkin 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(11):1607-1609
The conditions of compatibility of the magnetic sublattice hypothesis with the requirements of quantum theory have been derived. These conditions imply the presence of (even weak) magnetic anisotropy and a macroscopic number of spins in the sublattice. 相似文献
979.
Microstructure and oxygen stoichiometry of YBaCuO films manufactured by laser ablation are investigated. Dependence of the specific electrical resistivity and superconducting
parameters of films on microstructure and oxygen stoichiometry is demonstrated. Conditions of deposition are determined, under
which films with minimum microstructure defects and good conducting properties are formed.
__________
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 41–45, February, 2007. 相似文献
980.
This paper reports a successful achievement of laser-induced biological cell fusion using an excimer laser excited dye laser. To our knowledge, we examined for the first time the dependence of fusion rate on laser pulse energy, number of laser pulses, and laser wavelength. Maximum fusion rate of approximately 50% was obtained by this laser fusion technology. 相似文献