全文获取类型
收费全文 | 409258篇 |
免费 | 3092篇 |
国内免费 | 956篇 |
专业分类
化学 | 190623篇 |
晶体学 | 6464篇 |
力学 | 21431篇 |
综合类 | 7篇 |
数学 | 59930篇 |
物理学 | 134851篇 |
出版年
2021年 | 3150篇 |
2020年 | 3369篇 |
2019年 | 3803篇 |
2018年 | 11939篇 |
2017年 | 12645篇 |
2016年 | 10530篇 |
2015年 | 4852篇 |
2014年 | 7165篇 |
2013年 | 16090篇 |
2012年 | 15851篇 |
2011年 | 24858篇 |
2010年 | 16855篇 |
2009年 | 16834篇 |
2008年 | 21901篇 |
2007年 | 24651篇 |
2006年 | 12375篇 |
2005年 | 15942篇 |
2004年 | 12544篇 |
2003年 | 11476篇 |
2002年 | 9884篇 |
2001年 | 10530篇 |
2000年 | 7941篇 |
1999年 | 6007篇 |
1998年 | 5010篇 |
1997年 | 4829篇 |
1996年 | 4654篇 |
1995年 | 3966篇 |
1994年 | 3912篇 |
1993年 | 3784篇 |
1992年 | 4169篇 |
1991年 | 4380篇 |
1990年 | 4169篇 |
1989年 | 4086篇 |
1988年 | 3867篇 |
1987年 | 4002篇 |
1986年 | 3763篇 |
1985年 | 4721篇 |
1984年 | 4785篇 |
1983年 | 3985篇 |
1982年 | 4065篇 |
1981年 | 3787篇 |
1980年 | 3743篇 |
1979年 | 4027篇 |
1978年 | 4024篇 |
1977年 | 3945篇 |
1976年 | 3944篇 |
1975年 | 3727篇 |
1974年 | 3666篇 |
1973年 | 3725篇 |
1972年 | 2639篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
971.
972.
V. V. Bilykh 《Journal of Experimental and Theoretical Physics》2007,104(5):814-818
The polarition linewidth is calculated as a function of magnetic field applied perpendicular to the microcavity plane for microcavity excition-polaritons scattered by free electrons in a quantum well. The calculated function exhibits oscillatory behavior; i.e., the scattering rate either increases or decreases with magnetic induction. Possible applications of this effect are discussed. 相似文献
973.
Single-particle matrix elements of nucleon transfer were calculated by the Woods-Saxon potential wave functions. The results
are compared with the ones calculated by the spherical-well approximation. The eligibility of the approximation of the mean
field of nuclei by the spherical well to study the initial stage of nuclear reactions at heavy-ion collisions is demonstrated.
The text was submitted by the authors in English. 相似文献
974.
975.
We present a study of the temporal compression of nanosecond laser pulses resulting from the coherent control peculiarities of the propagation dynamics in a regime of electromagnetically induced transparency. We describe the general theoretical framework and discuss the crucial conditions required in order to experimentally realize such a temporal compression scheme. A proof-of-concept experimental realization of a scheme of this type in a sample of hot sodium vapors is currently being implemented: we describe in detail the experimental setup designed for this purpose. 相似文献
976.
977.
978.
The dynamical Casimir effect is analyzed in the framework of the S-matrix formulation for a one-dimensional cavity that exhibits contraction at a constant rate over a finite time interval. The exact solution to the problem is presented. It is demonstrated that the efficiency of the creation of pairs nonmonotonically depends on the contraction time. This is due to the fact that the particles are only created at the moments corresponding to the acceleration and stopping of the moving boundary, so that the contributions of these processes on the number of the created particles interfere with each other. The parameters that correspond to the optimal creation of pairs and the stability of a vacuum are presented. The effect of the finiteness of the cavity-boundary acceleration on the results obtained is studied. 相似文献
979.
A. Ya. Braginskii 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(2):181-186
For the case of a phase transition into a macroscopically inhomogeneous state described by the order parameter (OP) that is characterized by a multiarm star of a vector {ki}, a method for compensating the spatial variation in all star arms ki is proposed. To this end, a unified tensor field (OP connectivity) is considered, which is interpreted as a stress field potential. The OP-connectivity interaction is described by the phenomenological dislocation charge. Alternative ways of physical interpretation of the OP connectivity are discussed. 相似文献
980.
V. I. Zubkov I. S. Shulgunova A. V. Solomonov M. Geller A. Marent D. Bimberg A. E. Zhukov E. S. Semenova V. M. Ustinov 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(1):106-108
In this work, charge-carrier capture by an array of self-assembled InAs/GaAs quantum dots was directly observed for the first time by capacitance recharge. It is proposed to process the obtained transient-capture data by a similar method to that used for emission, by the box-car method. The capture activation energies are determined and compared with the emission activation energies. 相似文献