全文获取类型
收费全文 | 448734篇 |
免费 | 2294篇 |
国内免费 | 577篇 |
专业分类
化学 | 199077篇 |
晶体学 | 6453篇 |
力学 | 27463篇 |
综合类 | 9篇 |
数学 | 73884篇 |
物理学 | 144719篇 |
出版年
2020年 | 4166篇 |
2019年 | 5057篇 |
2018年 | 12362篇 |
2017年 | 12759篇 |
2016年 | 11955篇 |
2015年 | 4801篇 |
2014年 | 8496篇 |
2013年 | 15908篇 |
2012年 | 15571篇 |
2011年 | 22765篇 |
2010年 | 16659篇 |
2009年 | 17087篇 |
2008年 | 21029篇 |
2007年 | 23138篇 |
2006年 | 13012篇 |
2005年 | 14275篇 |
2004年 | 12385篇 |
2003年 | 12145篇 |
2002年 | 11326篇 |
2001年 | 10576篇 |
2000年 | 8389篇 |
1999年 | 6227篇 |
1998年 | 5714篇 |
1997年 | 5495篇 |
1996年 | 5180篇 |
1995年 | 4569篇 |
1994年 | 4597篇 |
1993年 | 4588篇 |
1992年 | 4655篇 |
1991年 | 5149篇 |
1990年 | 5072篇 |
1989年 | 5135篇 |
1988年 | 4789篇 |
1987年 | 4865篇 |
1986年 | 4544篇 |
1985年 | 5449篇 |
1984年 | 5660篇 |
1983年 | 4827篇 |
1982年 | 5064篇 |
1981年 | 4725篇 |
1980年 | 4381篇 |
1979年 | 5034篇 |
1978年 | 5221篇 |
1977年 | 5330篇 |
1976年 | 5522篇 |
1975年 | 5112篇 |
1974年 | 4940篇 |
1973年 | 5226篇 |
1972年 | 4345篇 |
1971年 | 3972篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Dineykhan M. Zhaugasheva S. A. Kozhamkulov T. A. Petrov E. V. 《Russian Physics Journal》2004,47(12):1250-1260
The mass spectrum of a coupled state is analytically determined. The mechanism of production of a constituent mass of particles forming a coupled state is explained. The change of the coupled state and constituent particle component masses attendant to changes of the coupling constant is analyzed. The mass spectrum of a two-gluon glueball is determined with allowance for spin-orbital and spin-spin interactions.__________Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 33–41, December, 2004. 相似文献
992.
A semiempirical model is proposed for the calculation of electrical, magnetic and thermal parameters of the plasma of a high-frequency induction discharge. The model is based on solving a system of two-dimensional Maxwell equations written for a cylindrical coordinate system. 相似文献
993.
A method of teaching of one of the divisions of electrodynamics devoted to relativity theory is suggested. The presentation is based on the four-dimensional formalism, which allows a number of fundamental physical phenomena to be considered from a unified position. The content is in full conformity with the approved standard programs for students and postgraduates of radio physical and radio technical specialities of universities. The methods can be useful to the teachers, scientific workers, and engineers concerned with other directions and specialities. 相似文献
994.
Based on particular solutions of a system of wave equations which describe electromagnetic processes in an unbounded biisotropic medium and are represented in the form of generalized power series, a dispersion equation is obtained for a two-layer circular waveguide with a chiral and a dielectric layer. The solution of the dispersion equation is analyzed for some types of natural waves. 相似文献
995.
V. S. Gorelik P. P. Sverbil' A. B. Fadyushin V. V. Vasil'ev 《Journal of Russian Laser Research》2004,25(1):54-63
A possibility of application of semiconductor lasers of the visible range as exciting sources for Raman spectroscopy is studied. An experimental set-up for measuring Raman spectra of polycrystalline dielectrics and broad-gap semiconductors excited by a semiconductor laser with a wavelength of 640 nm was created. The conditions under which the spectral width of the lasing line of a semiconductor laser was within 10-3 cm-1 in the continuous mode with a power of 10 mW are realized. The characteristics of various types of exciting sources used in Raman spectroscopy are compared. The results of studies of the characteristic Raman spectra excited with a semiconductor laser in polycrystalline sulfur are presented. 相似文献
996.
997.
998.
999.
1000.