全文获取类型
收费全文 | 14697篇 |
免费 | 647篇 |
国内免费 | 2篇 |
专业分类
化学 | 7890篇 |
晶体学 | 42篇 |
力学 | 265篇 |
数学 | 1901篇 |
物理学 | 4643篇 |
无线电 | 605篇 |
出版年
2023年 | 132篇 |
2021年 | 145篇 |
2020年 | 176篇 |
2019年 | 109篇 |
2018年 | 174篇 |
2017年 | 180篇 |
2016年 | 381篇 |
2015年 | 374篇 |
2014年 | 354篇 |
2013年 | 663篇 |
2012年 | 627篇 |
2011年 | 815篇 |
2010年 | 354篇 |
2009年 | 318篇 |
2008年 | 717篇 |
2007年 | 696篇 |
2006年 | 674篇 |
2005年 | 542篇 |
2004年 | 423篇 |
2003年 | 419篇 |
2002年 | 376篇 |
2001年 | 357篇 |
2000年 | 289篇 |
1999年 | 232篇 |
1998年 | 203篇 |
1997年 | 213篇 |
1996年 | 201篇 |
1995年 | 191篇 |
1994年 | 176篇 |
1993年 | 201篇 |
1992年 | 196篇 |
1991年 | 162篇 |
1990年 | 135篇 |
1989年 | 128篇 |
1988年 | 116篇 |
1987年 | 130篇 |
1986年 | 140篇 |
1985年 | 152篇 |
1984年 | 185篇 |
1983年 | 167篇 |
1982年 | 174篇 |
1981年 | 184篇 |
1980年 | 162篇 |
1979年 | 150篇 |
1978年 | 167篇 |
1977年 | 159篇 |
1976年 | 138篇 |
1975年 | 131篇 |
1974年 | 122篇 |
1973年 | 112篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
101.
102.
103.
104.
G. Rauprich H. J. Hähn M. Karus P. Nießen K. R. Nyga H. Oswald L. Sydow H. Paetz gen Schieck Y. Koike 《Few-Body Systems》1988,5(2):67-77
The
elastic scattering was investigated especially in the Coulomb sensitive scattering regions. Angular distributions of the differential cross section and of the analyzing powerA
y, with emphasis on small scattering angles, were measured at 10.0 and 14.1 MeV. For extreme backward angles up toJ
c.m.=179° the differential cross section was measured at 12.0, 14.1 and 16.5 MeV. The data have been compared with recent Faddeev calculations based on the realistic meson-exchange Paris potential and including an approximate Coulomb correction. There are discrepancies between the data and the calculations especially for the analyzing power. This indicates that the approximate treatment of Coulomb effects and possibly also the purely nuclear part of the calculations need to be improved. 相似文献
105.
A. Türler H. W. Gäggeler D. T. Jost P. Armbruster W. Brüchle H. Folger F. P. Heßberger S. Hofmann G. Münzenberg V. Ninov M. Schädel K. Sümmerer J. V. Kratz U. Scherer 《Zeitschrift für Physik A Hadrons and Nuclei》1988,331(3):363-364
The isotope254No was produced in the fusion reaction48Ca +208Pb. Using the velocity filter SHIP and radiochemical techniques it was found that the nuclide254No with a half-life of 55 s decays byα, EC, and spontaneous-fission. Deduced partial half-lives are (61±2) s forα-decay, (550 ?160 +370 ) s for EC and [2.2 ?1.0 +2.0 ]×104 s for spontaneous fission. 相似文献
106.
L. Käubler W. Enghardt H. Prade P. Carlé L. O. Norlin K. -G. Rensfelt U. Rosengård 《Zeitschrift für Physik A Hadrons and Nuclei》1988,329(2):143-150
Using the reaction138Ba(α,2n)140Ce the magnetic moment of the 10 1 + isomer atE x =3714.7 keV in theN=82 nucleus140Ce has been determined by means of the TDPAD method toμ=+10.3(4)μ N . Measuredg-factors in140Ce are compared to calculations within the shell model with configuration mixing. For the 10 1 + isomer in140Ce the four proton configuration π(1g 7 2/2 ,2d 5 2/2 ) has been found to be dominant. From theg-factor measurement strong contributions of multiparticle excitations to thegp2d 3/2,π3s 1 2 or π1h 11 2 shells and admixtures of neutron excitations to the wave function of the 10 1 + state could be excluded. The strongE1γ-branch of the deexcitation of the 10 1 + isomer in140Ce can be explained by means of small admixtures of configurations which contain the outer subshell excitationsπ2f 7/2 andπ1h 9/2. On this basisE1 transitions experimentally observed in theN=82 nuclei140Ce,141Pr and145Eu may be understood. 相似文献
107.
Rolf Källström 《Communications in Mathematical Physics》1989,126(1):157-166
In this paper we consider distributions of the form 1/P and dy/P(x,y), whereP is a polynomial. Using results by Kashiwara and Kawai we give fairly accessible proofs that these expressions can be defined as regular holonomic distributions by utilising a meromorphic parameter. We also discuss distributions of the form /P and their direct image
, when one knows that is a regular holonomic distribution. All these distributions are relevant to the study of renormalised Feynman integrals. 相似文献
108.
109.
110.