全文获取类型
收费全文 | 7721篇 |
免费 | 199篇 |
国内免费 | 10篇 |
专业分类
化学 | 4371篇 |
晶体学 | 57篇 |
力学 | 178篇 |
数学 | 1155篇 |
物理学 | 2169篇 |
出版年
2022年 | 50篇 |
2021年 | 66篇 |
2020年 | 76篇 |
2019年 | 69篇 |
2018年 | 65篇 |
2017年 | 71篇 |
2016年 | 152篇 |
2015年 | 126篇 |
2014年 | 165篇 |
2013年 | 359篇 |
2012年 | 379篇 |
2011年 | 431篇 |
2010年 | 219篇 |
2009年 | 179篇 |
2008年 | 351篇 |
2007年 | 375篇 |
2006年 | 369篇 |
2005年 | 388篇 |
2004年 | 290篇 |
2003年 | 258篇 |
2002年 | 235篇 |
2001年 | 184篇 |
2000年 | 156篇 |
1999年 | 103篇 |
1998年 | 73篇 |
1997年 | 98篇 |
1996年 | 97篇 |
1995年 | 106篇 |
1994年 | 107篇 |
1993年 | 98篇 |
1992年 | 113篇 |
1991年 | 76篇 |
1990年 | 76篇 |
1989年 | 60篇 |
1988年 | 61篇 |
1987年 | 56篇 |
1986年 | 65篇 |
1985年 | 106篇 |
1984年 | 113篇 |
1983年 | 91篇 |
1982年 | 109篇 |
1981年 | 108篇 |
1980年 | 85篇 |
1979年 | 95篇 |
1978年 | 95篇 |
1977年 | 101篇 |
1976年 | 104篇 |
1975年 | 87篇 |
1974年 | 74篇 |
1973年 | 96篇 |
排序方式: 共有7930条查询结果,搜索用时 0 毫秒
1.
2.
3.
Hansen Karin Vels Kreka Kosova Jacobsen Torben 《Journal of Solid State Electrochemistry》2019,23(3):811-822
Journal of Solid State Electrochemistry - Local cathodic polarizations of yttria-stabilized zirconia were carried out with a PtIr probe as the working electrode in a controlled atmosphere high... 相似文献
4.
5.
Simen Gjelseth Antonsen Arne Joakim C. Bunkan Tomas Mikoviny Yngve Stenstrøm Armin Wisthaler 《Molecular physics》2020,118(15)
The kinetics of the O3, OH and NO3 radical reactions with diazomethane were studied in smog chamber experiments employing long-path FTIR and PTR-ToF-MS detection. The rate coefficients were determined to be k CH2NN+O3?=?(3.2?±?0.4)?×?10?17 and k CH2NN+OH?=?(1.68?±?0.12)?×?10?10 cm3 molecule?1 s?1 at 295?±?3?K and 1013?±?30 hPa, whereas the CH2NN?+?NO3 reaction was too fast to be determined in the static smog chamber experiments. Formaldehyde was the sole product observed in all the reactions. The experimental results are supported by CCSD(T*)-F12a/aug-cc-pVTZ//M062X/aug-cc-pVTZ calculations showing the reactions to proceed exclusively via addition to the carbon atom. The atmospheric fate of diazomethane is discussed. 相似文献
6.
P. Seelig A. Dax S. Faber M. Gerlach G. Huber T. Kühl D. Marx P. Merz W. Quint F. Schmitt H. Winter M. Würtz 《Hyperfine Interactions》1998,114(1-4):135-139
The investigation of the 1s HFS provides a good possibility for testing QED effects in a combination of a strong electric
and magnetic field. Here, we report about the laserspectroscopic measurements of the ground state hyperfine splitting in 207Pb81+. To handle this M1-transition in the infrared optical regime with its long lifetime, we developed a new detection technique
using a bunched ion beam. For the observation of fluorescence light, a new mirror system is adapted to the emission characteristics
from an ion beam at relativistic velocities.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
7.
It is proved that biorthogonal polynomials obey two different kinds of Christoffel-Darboux-type formulae, one linking polynomials with a different parameter and one combining polynomials with different degrees. This is used to produce a mixed recurrence relation, which is valid for all biorthogonal polynomials. This recurrence relation establishes several results on interlacing property of zeros of successive biorthogonal polynomials and leads to a new result on the interlace of zeros of orthogonal polynomials (of equal degrees) with respect to two distributionsdψ(x) andx p dψ(x), 0<p≤1, with support in either [0, 1] or [1, ∞). 相似文献
8.
Olaf Hansen 《Mathematical Methods in the Applied Sciences》2002,25(12):1075-1090
In this article we study the radiosity operator along an edge between two adjacent half‐planes. First we show that the radiosity operator is invertible in a whole scale of anisotropic Sobolev spaces. In the absence of any shadows we are able to derive regularity properties of the solution, which depend only on the angle between the half‐planes, the reflectivity coefficients and the right‐hand side. This work can be considered as a supplement to the article of Rathsfeld (Mathematical Methods in the Applied Sciences 1999; 22 : 217–241). Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
9.
Kasper K. Berthelsen Jesper Møller 《Bulletin of the Brazilian Mathematical Society》2002,33(3):351-367
This primer provides a self-contained exposition of the case where spatial birth-and-death processes are used for perfect
simulation of locally stable point processes. Particularly, a simple dominating coupling from the past (CFTP) algorithm and
the CFTP algorithms introduced in [13], [14], and [5] are studied. Some empirical results for the algorithms are discussed.
Received: 30 June 2002 相似文献
10.
We use the adiabatic hyperspheric expansion and the Faddeev decomposition of the wave function with only s-waves. We derive for a fixed hyperradius an integro-differential equation for the angular eigenvalue and wave function. The
correlations lower the interaction energy for N = 20 by about a factor of 5.
Received October 22, 2001; accepted for publication November 5, 2001 相似文献