全文获取类型
收费全文 | 1358篇 |
免费 | 30篇 |
国内免费 | 5篇 |
专业分类
化学 | 918篇 |
晶体学 | 3篇 |
力学 | 33篇 |
数学 | 192篇 |
物理学 | 247篇 |
出版年
2022年 | 5篇 |
2021年 | 6篇 |
2020年 | 10篇 |
2019年 | 16篇 |
2018年 | 12篇 |
2017年 | 22篇 |
2016年 | 30篇 |
2015年 | 34篇 |
2014年 | 35篇 |
2013年 | 83篇 |
2012年 | 55篇 |
2011年 | 79篇 |
2010年 | 47篇 |
2009年 | 45篇 |
2008年 | 90篇 |
2007年 | 81篇 |
2006年 | 82篇 |
2005年 | 88篇 |
2004年 | 79篇 |
2003年 | 52篇 |
2002年 | 50篇 |
2001年 | 23篇 |
2000年 | 21篇 |
1999年 | 12篇 |
1998年 | 9篇 |
1997年 | 16篇 |
1996年 | 22篇 |
1995年 | 14篇 |
1994年 | 13篇 |
1993年 | 10篇 |
1992年 | 13篇 |
1991年 | 5篇 |
1990年 | 12篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 11篇 |
1986年 | 13篇 |
1985年 | 11篇 |
1984年 | 24篇 |
1983年 | 23篇 |
1982年 | 13篇 |
1981年 | 11篇 |
1980年 | 9篇 |
1979年 | 8篇 |
1978年 | 7篇 |
1977年 | 9篇 |
1976年 | 10篇 |
1975年 | 6篇 |
1973年 | 10篇 |
1954年 | 4篇 |
排序方式: 共有1393条查询结果,搜索用时 15 毫秒
191.
192.
Per Sjlin 《Mathematische Nachrichten》1987,133(1):237-245
L2 boundedness is proved for a class of oscillatory singular integrals. In [3] we proved the following theorem. 相似文献
193.
194.
The origin behind the dipolar order in molecular fluids is investigated by using a simple dipolar fluid and Monte Carlo simulation
technique. A penalty function is employed to separately manipulate the positional and orientational structure of the fluid.
By considering the distance-dependent Kirkwood function G
k, which in turn is related to the dielectric permittivity of the fluid, it is observed that both positional and orientational
ordering are involved to establish dipolar order. 相似文献
195.
We study the damping of molecular vibrations due to electron-hole pair excitations in donor-acceptor (D-A) type molecular rectifiers. At finite voltage additional nonequilibrium electron-hole pair excitations involving both electrodes become possible, and contribute to the stimulated emission and absorption of phonons. We point out a generic mechanism for D-A molecules, where the stimulated emission can dominate beyond a certain voltage due to the inverted position of the D and A quantum resonances. This leads to current-driven amplification (negative damping) of the phonons similar to laser action. We investigate the effect in realistic molecular rectifier structures using first-principles calculations. 相似文献
196.
Greibe T Stenberg MP Wilson CM Bauch T Shumeiko VS Delsing P 《Physical review letters》2011,106(9):097001
In highly resistive superconducting tunnel junctions, excess subgap current is usually observed and is often attributed to microscopic pinholes in the tunnel barrier. We have studied the subgap current in superconductor-insulator-superconductor (SIS) and superconductor-insulator-normal-metal (SIN) junctions. In Al/AlO(x)/Al junctions, we observed a decrease of 2 orders of magnitude in the current upon the transition from the SIS to the SIN regime, where it then matched theory. In Al/AlO(x)/Cu junctions, we also observed generic features of coherent diffusive Andreev transport in a junction with a homogenous barrier. We use the quasiclassical Keldysh-Green function theory to quantify single- and two-particle tunneling and find good agreement with experiment over 2 orders of magnitude in transparency. We argue that our observations rule out pinholes as the origin of the excess current. 相似文献
197.
Shape verification aimed for manufacturing process control 总被引:1,自引:0,他引:1
198.
Numerical Algorithms - This paper describes a new MATLAB software package of iterative regularization methods and test problems for large-scale linear inverse problems. The software package, called... 相似文献
199.
Journal of Fourier Analysis and Applications - Localization and convergence almost everywhere of Schrödinger means are studied. 相似文献
200.
The Carleson operator is closely related to the maximal partial sum operator for Fourier series. We study generalizations of this operator in one and several variables. 相似文献