全文获取类型
收费全文 | 419532篇 |
免费 | 3001篇 |
国内免费 | 1274篇 |
专业分类
化学 | 200235篇 |
晶体学 | 6524篇 |
力学 | 23119篇 |
综合类 | 13篇 |
数学 | 70704篇 |
物理学 | 123212篇 |
出版年
2020年 | 3156篇 |
2019年 | 3767篇 |
2018年 | 15233篇 |
2017年 | 15054篇 |
2016年 | 13182篇 |
2015年 | 4713篇 |
2014年 | 7076篇 |
2013年 | 15323篇 |
2012年 | 15165篇 |
2011年 | 23685篇 |
2010年 | 15875篇 |
2009年 | 16443篇 |
2008年 | 19201篇 |
2007年 | 21131篇 |
2006年 | 11957篇 |
2005年 | 11651篇 |
2004年 | 11243篇 |
2003年 | 10822篇 |
2002年 | 9735篇 |
2001年 | 10121篇 |
2000年 | 7672篇 |
1999年 | 5784篇 |
1998年 | 4950篇 |
1997年 | 4866篇 |
1996年 | 4635篇 |
1995年 | 4155篇 |
1994年 | 4192篇 |
1993年 | 4031篇 |
1992年 | 4531篇 |
1991年 | 4583篇 |
1990年 | 4429篇 |
1989年 | 4448篇 |
1988年 | 4351篇 |
1987年 | 4363篇 |
1986年 | 4127篇 |
1985年 | 5323篇 |
1984年 | 5414篇 |
1983年 | 4634篇 |
1982年 | 4720篇 |
1981年 | 4522篇 |
1980年 | 4312篇 |
1979年 | 4762篇 |
1978年 | 4763篇 |
1977年 | 4883篇 |
1976年 | 4921篇 |
1975年 | 4662篇 |
1974年 | 4572篇 |
1973年 | 4821篇 |
1972年 | 3489篇 |
1971年 | 3066篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
The problem of the vector and axial-vector dominance of weak interactions within the framework of the quark model of superconductivity type is discussed. 相似文献
43.
44.
Using an integral theory of grating diffraction we calculate efficiencies greater than 100% if a coating with gain is taken into account. A connection with guided modes is conjectured. The application in optical computing seems to be possible. 相似文献
45.
46.
47.
Transport as a consequence of state-dependent diffusion 总被引:1,自引:0,他引:1
M. Büttiker 《Zeitschrift für Physik B Condensed Matter》1987,68(2-3):161-167
Overdamped particles subject to a drift in a force field with sinusoidal space dependence and also a sinusoidally modulated space-dependent diffusion, with the same period as the drift, experience a net driving force. The resulting current depends on the amplitude of the modulation of the diffusion and is a periodic function of the phase difference between the sinusoidal drift and the sinusoidal modulation of the diffusion. For small modulation amplitudes a particle subject to state-dependent noise behaves the same way as a particle subject to thermal noise but with a drift which, in addition to the sinusoidal term, contains a net force term.Dedicated to Professor Harry Thomas on the occasion of his 60th birthday 相似文献
48.
D. N. Zaporozhets 《Journal of Mathematical Sciences》2006,137(1):4525-4530
In this note, we find the distibution of the number of real zeros of a random polynomial. We also derive a formula for the
expected number of complex zeros lying in a given domain of the complex plane. Bibliography: 7 titles.
__________
Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 320, 2004, pp. 69–79. 相似文献
49.
The main result of the paper is a theorem, using which a new proof of Roth’s theorem is obtained, a new solvability criterion
for the matrix equation AX-YB = C is proved, a formula for a particular solution of the latter is derived, and the least of
the orders of square nonsingular matrices containing a given rectangular matrix as a submatrix is determined. Bibliography:
5 titles.
__________
Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 323, 2005, pp. 15–23. 相似文献
50.
Using the method of the tensor Green’s function of the wave equation, the differential and total cross sections for the scattering of surface optical electromagnetic waves (surface plasmon polaritons) by a spherical nanoparticle into surface plasmon polaritons and light have been obtained with the inclusion of the magnetic dipole contribution. Using the example of noble metal systems, it has been shown that the magnetic dipole contribution may significantly affect the angular dependence of the differential cross sections and increase their anisotropy as the plasmon wavelength increases. 相似文献