全文获取类型
收费全文 | 5082篇 |
免费 | 87篇 |
国内免费 | 9篇 |
专业分类
化学 | 2932篇 |
晶体学 | 9篇 |
力学 | 58篇 |
综合类 | 1篇 |
数学 | 510篇 |
物理学 | 1668篇 |
出版年
2020年 | 56篇 |
2019年 | 37篇 |
2018年 | 39篇 |
2016年 | 56篇 |
2015年 | 55篇 |
2014年 | 66篇 |
2013年 | 103篇 |
2012年 | 128篇 |
2011年 | 170篇 |
2010年 | 108篇 |
2009年 | 82篇 |
2008年 | 147篇 |
2007年 | 175篇 |
2006年 | 170篇 |
2005年 | 157篇 |
2004年 | 156篇 |
2003年 | 139篇 |
2002年 | 122篇 |
2001年 | 118篇 |
2000年 | 99篇 |
1999年 | 90篇 |
1998年 | 79篇 |
1997年 | 69篇 |
1996年 | 93篇 |
1995年 | 96篇 |
1994年 | 101篇 |
1993年 | 97篇 |
1992年 | 114篇 |
1991年 | 78篇 |
1990年 | 68篇 |
1989年 | 58篇 |
1988年 | 74篇 |
1987年 | 72篇 |
1986年 | 65篇 |
1985年 | 65篇 |
1984年 | 64篇 |
1983年 | 50篇 |
1982年 | 68篇 |
1981年 | 63篇 |
1980年 | 52篇 |
1979年 | 55篇 |
1978年 | 54篇 |
1977年 | 51篇 |
1976年 | 43篇 |
1975年 | 47篇 |
1974年 | 46篇 |
1973年 | 63篇 |
1972年 | 32篇 |
1971年 | 40篇 |
1956年 | 31篇 |
排序方式: 共有5178条查询结果,搜索用时 15 毫秒
111.
P. Ackerbauer W. H. Breunlich M. Fuchs S. Fussy M. Jeitler P. Kammel B. Lauss J. Marton W. Prymas J. Werner J. Zmeskal K. Lou C. Petitjean P. Baumann H. Daniel F. J. Hartmann W. Schott T. von Egidy P. Wojciechowski D. Chatellard J. P. Egger E. Jeannet T. Case K. M. Crowe R. H. Sherman V. Markushin 《Hyperfine Interactions》1993,82(1-4):243-258
Complementary to the investigations of the most efficient dt cycle, also the other muon-induced fusion cycles in mixtures of hydrogen isotopes have been studied. The results of these dedicated experiments provide rich information about muon-induced few-body reactions and contribute significantly to a better overall understanding of CF. A summary of the recent progress will be presented. Special emphasis will be put on two characteristic examples, namely a new experimental approach to study the muonic cascade in H-D mixtures and the systematic study of hyperfine effects in muon-induced reactions. 相似文献
112.
P. Ackerbauer J. Werner W. H. Breunlich M. Cargnelli M. Jeitler P. Kammel J. Marton N. Nägele A. Scrinzi J. Zmeskal J. Bistirlich K. M. Crowe C. Petitjean R. H. Sherman P. Baumann H. Bossy H. Daniel F. J. Hartmann W. Schott T. von Egidy W. Neumann 《Hyperfine Interactions》1993,82(1-4):357-372
A main source of information about the muon-catalyzed fusion cycle in D-T mixtures are the cycling rates c, which are characteristic for the kinetic equilibrium of states attained rapidly in dense targets. The measurement, analysis and interpretation of these rates will be discussed, concentrating on the extensive set of rates observed at PSI over the last decade in gaseous, liquid and solid targets.Invited talk presented by Peter Kammel. 相似文献
113.
114.
J. Rico B. Rubio J. L. Tain A. Gadea J. Bea L. M. Garcia-Raffi O. Tengblad P. Kleinheinz R. Menegazzo R. Wirowski P. von Brentano G. Siems J. Blomqvist 《Zeitschrift für Physik A Hadrons and Nuclei》1993,345(2):245-246
In a high sensitivity (,2n) in-beam study of
62
144
Sm82, with the Kölner Würfel OSIRIS -detector array including a Compton polarimeter, we have identified the complete two-proton multiplets d
5
2/–2
, d
5
2/–1
g
7
2/–1
, g
7
2/–2
, h11/2d
5
2/–1
and the 9– to 4– members of the h11·/2g
7
2/–1
multiplet.Work partially supported by CICYT (Spain). 相似文献
115.
116.
117.
118.
119.
C(alpha)-Formylglycine, the catalytic amino acid residue in the active site of sulfatases, is generated by post-translational modification of a cysteine or serine residue. We describe a highly sensitive procedure for the detection of C(alpha)-formylglycine-containing peptides in tryptic digests of sulfatase proteins. The protocol is based on the formation of hydrazone derivatives of C(alpha)-formylglycine-containing peptides when using dinitrophenylhydrazine as a matrix for matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS). The hydrazone derivatives desorb and ionize with high efficiency and can be detected in the sub-femtomole range. The presence of C(alpha)-formylglycine is indicated by a mass increment of 180.13 u, corresponding to the hydrazone moiety, and also by a unique C-terminal fragment ion, characteristic of sulfatases, that becomes prominent in MALDI post-source decay mass spectra of the hydrazone derivatives. 相似文献
120.
Omar Deeb Prof. Monika Leibscher Dr. Jörn Manz Prof. Wulf von Muellern Tamar Seideman Prof. 《Chemphyschem》2007,8(2):322-328
We propose an approach for separating nuclear spin isomers with coherent light and illustrate it by numerical calculations using fulvene as a model system. The scheme employs the equivalence of torsion and interchange of equivalent H-atoms in a class of molecules of which fulvene is a simple example. The exchange symmetry couples with the rotational symmetry to produce a spatial distinction between the two photo-excited nuclear spin isomers, and wavepacket interferometry is applied to separate the species. 相似文献