全文获取类型
收费全文 | 1233篇 |
免费 | 126篇 |
国内免费 | 109篇 |
专业分类
化学 | 840篇 |
晶体学 | 20篇 |
力学 | 59篇 |
综合类 | 8篇 |
数学 | 237篇 |
物理学 | 304篇 |
出版年
2023年 | 21篇 |
2022年 | 41篇 |
2021年 | 41篇 |
2020年 | 51篇 |
2019年 | 46篇 |
2018年 | 49篇 |
2017年 | 44篇 |
2016年 | 70篇 |
2015年 | 55篇 |
2014年 | 66篇 |
2013年 | 87篇 |
2012年 | 74篇 |
2011年 | 99篇 |
2010年 | 65篇 |
2009年 | 56篇 |
2008年 | 62篇 |
2007年 | 56篇 |
2006年 | 62篇 |
2005年 | 54篇 |
2004年 | 36篇 |
2003年 | 25篇 |
2002年 | 19篇 |
2001年 | 15篇 |
2000年 | 23篇 |
1999年 | 18篇 |
1998年 | 14篇 |
1997年 | 13篇 |
1996年 | 19篇 |
1995年 | 23篇 |
1994年 | 12篇 |
1993年 | 17篇 |
1992年 | 16篇 |
1991年 | 17篇 |
1990年 | 9篇 |
1989年 | 5篇 |
1988年 | 4篇 |
1987年 | 5篇 |
1986年 | 6篇 |
1985年 | 8篇 |
1984年 | 5篇 |
1983年 | 8篇 |
1982年 | 7篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1978年 | 7篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1975年 | 2篇 |
1974年 | 3篇 |
1973年 | 5篇 |
排序方式: 共有1468条查询结果,搜索用时 15 毫秒
91.
In this study, we report a novel and simple solution-phase route for one-dimensional metal nanocrystals. BiIn nanocrystals were prepared by directly dispersing melting BiIn alloy at an appropriate solvent. The as-obtained BiIn nanocrystals with a dendritic shape possess a good crystalline phase. The morphology of the nanocrystals can be greatly modified by changing the reaction parameters. This strong UV emission might arise from the quantum-confined In2O3 particles. 相似文献
92.
Dang Van Soa Takeo Inami Hoang Ngoc Long 《The European Physical Journal C - Particles and Fields》2004,34(3):285-289
We study the production of bileptons, new gauge bosons of lepton number two, in the minimal 3-3-1 model in high energy
collisions. If the bilepton masses are in the range of 300 GeV the reaction will give observable cross-sections in future colliders.Received: 5 August 2003, Published online: 23 March 2004Dang Van Soa: On leave of absence from Department of Physics, Hanoi University of Education, Hanoi, VietnamHoang Ngoc Long: On leave of absence from Institute of Physics, NCST, P.O. Box 429, Bo Ho, Hanoi 10000, Vietnam 相似文献
93.
Cao Thi Vi Ba Ha Huy Bang Dang Van Soa 《International Journal of Theoretical Physics》2003,42(8):1781-1786
We propose commutation relations for a single mode -deformed para-Bose oscillator. In this new deformation of para-Bose statistics the distribution function has the same form as in the para-Bose statistics. Furthermore, we show analogies between the coherent states of -deformed and q-deformed para-Bose statistics. 相似文献
94.
A simplicial algorithm is proposed for computing an integer point of a convex set
CRn
satisfying
with
The algorithm subdivides R
n into integer simplices and assigns an integer labelto each integer point of R
n. Starting at an arbitraryinteger point, the algorithm follows a finite simplicial path that leads either to an integer point of C or to the conclusion that C has no integer point. 相似文献
95.
96.
97.
The work strengthens the result established by L. Cohen on uncertainty principle involving phase derivative. We propose stronger uncertainty principles not only in the classical setting for Fourier transform, but also for self-adjoint operators. We also deduce the conditions that give rise to the equal relation of the uncertainty principle. Examples are provided to show that the new uncertainty principle is truly sharper than the existing ones in literature. 相似文献
98.
99.
100.
Phuong-Thanh Dang 《Molecular physics》2013,111(12):1581-1592
Recent work has shown that a certain surface hopping form of the wave function is capable of obtaining highly accurate transition probabilities for nonadiabatic problems. It has also been found that it is necessary to include hops in classically forbidden regions in order to obtain this level of accuracy at low energies. The amplitude for the hops in this surface hopping expansion of the wave function has the typical p?1/2 semiclassical divergence at the turning points in the classical motion. While this singularity is an integrable divergence, the divergent behavior complicates the numerical evaluation of the integrals over hopping points that is present in the surface hopping expressions. Numerical evidence has shown that only small errors are incurred at most energies if these singular hopping amplitudes are replaced with a nonsingular approximation. This agreement is surprising, since the exact and approximate amplitudes differ greatly in the turning point region, and this region is expected to make important contributions to the transition probability at low energies. A numerical analysis is presented in this work that provides a justification as to why this numerically useful approximation works as well as it does. 相似文献