全文获取类型
收费全文 | 5039篇 |
免费 | 150篇 |
国内免费 | 34篇 |
专业分类
化学 | 3493篇 |
晶体学 | 39篇 |
力学 | 83篇 |
数学 | 651篇 |
物理学 | 957篇 |
出版年
2023年 | 32篇 |
2022年 | 91篇 |
2021年 | 113篇 |
2020年 | 110篇 |
2019年 | 103篇 |
2018年 | 94篇 |
2017年 | 62篇 |
2016年 | 164篇 |
2015年 | 132篇 |
2014年 | 157篇 |
2013年 | 264篇 |
2012年 | 326篇 |
2011年 | 405篇 |
2010年 | 197篇 |
2009年 | 172篇 |
2008年 | 296篇 |
2007年 | 278篇 |
2006年 | 277篇 |
2005年 | 242篇 |
2004年 | 189篇 |
2003年 | 173篇 |
2002年 | 147篇 |
2001年 | 62篇 |
2000年 | 76篇 |
1999年 | 46篇 |
1998年 | 34篇 |
1997年 | 46篇 |
1996年 | 70篇 |
1995年 | 58篇 |
1994年 | 27篇 |
1993年 | 42篇 |
1992年 | 47篇 |
1991年 | 36篇 |
1990年 | 30篇 |
1989年 | 30篇 |
1988年 | 37篇 |
1987年 | 19篇 |
1986年 | 28篇 |
1985年 | 42篇 |
1984年 | 30篇 |
1983年 | 26篇 |
1982年 | 43篇 |
1981年 | 41篇 |
1980年 | 37篇 |
1979年 | 31篇 |
1978年 | 30篇 |
1977年 | 22篇 |
1976年 | 21篇 |
1975年 | 24篇 |
1973年 | 20篇 |
排序方式: 共有5223条查询结果,搜索用时 15 毫秒
41.
P. Abreu W. Adam T. Adye E. Agasi R. Aleksan G. D. Alekseev P. Allport S. Almehed F. M. L. Almeida Junior S. J. Alvsvaag et al. 《Zeitschrift fur Physik C Particles and Fields》1994,63(1):3-15
The average lifetime ofB hadrons was measured using data collected with the DELPHI detector at the LEP collider during 1991 and 1992. The measurement was performed using two different anayses. The first method was an improvement on a previous technique, which used charged particle impact parameter distributions. This analysis measured an average lifetime forB hadrons of
相似文献
42.
P. Abreu W. Adam T. Adye E. Agasi R. Aleksan G. D. Alekseev A. Algeri S. Almehed S. J. Alvsvaag U. Amaldi et al. 《Zeitschrift fur Physik C Particles and Fields》1994,61(3):407-419
The study of the properties of inclusive production ofD
s
mesons and of events in which a and a muon are present in the same jet provides two independent measurements of the probability,f
s
w
, for a heavy quark to hadronize into a strangeB orD meson. The data sample analysed corresponds to 243,000 hadronicZ
0 decays. The combined value of these measurements isf
s
w
=0.19±0.06±0.08. From the flight distance distributions ofD
s and of (-lepton) secondary vertices, with the lepton emitted at high transverse momentum relative to the jet axis, two values are obtained for theB
s
0
meson lifetime. Combining these measurements with a previous result based on the study ofD
s- events, theB
s
0
meson lifetime is measured to be: 0.96±0.37 ps. 相似文献
43.
Abachi S Abbott B Abolins M Acharya BS Adam I Adams DL Adams M Ahn S Aihara H Alitti J Álvarez G Alves GA Amidi E Amos N Anderson EW Aronson SH Astur R Avery RE Baarmand MM Baden A Balamurali V Balderston J Baldin B Banerjee S Bantly J Bartlett JF Bazizi K Bendich J Beri SB Bertram I Bezzubov VA Bhat PC Bhatnagar V Bhattacharjee M Bischoff A Biswas N Blazey G Blessing S Bloom P Boehnlein A Bojko NI Borcherding F Borders J Boswell C Brandt A Brock R Bross A Buchholz D Burtovoi VS Butler JM 《Physical review letters》1996,77(4):595-600
44.
Abachi S Abbott B Abolins M Acharya BS Adam I Adams DL Adams M Ahn S Aihara H Alitti J Álvarez G Alves GA Amidi E Amos N Anderson EW Aronson SH Astur R Avery RE Baarmand MM Baden A Balamurali V Balderston J Baldin B Banerjee S Bantly J Bartlett JF Bazizi K Bendich J Beri SB Bertram I Bezzubov VA Bhat PC Bhatnagar V Bhattacharjee M Bischoff A Biswas N Blazey G Blessing S Bloom P Boehnlein A Bojko NI Borcherding F Borders J Boswell C Brandt A Brock R Bross A Buchholz D Burtovoi VS Butler JM 《Physical review letters》1996,77(25):5011-5015
45.
Abachi S Abbott B Abolins M Acharya BS Adam I Adams DL Adams M Ahn S Aihara H Alitti J Álvarez G Alves GA Amidi E Amos N Anderson EW Aronson SH Astur R Avery RE Baden A Balamurali V Balderston J Baldin B Bantly J Bartlett JF Bazizi K Bendich J Beri SB Bertram I Bezzubov VA Bhat PC Bhatnagar V Bhattacharjee M Bischoff A Biswas N Blazey G Blessing S Bloom P Boehnlein A Bojko NI Borcherding F Borders J Boswell C Brandt A Brock R Bross A Buchholz D Burtovoi VS Butler JM Carvalho W Casey D 《Physical review letters》1996,76(18):3271-3276
46.
47.
48.
The paper provides the complete list of local models forZ 2 l -invariant generic germs of Lagrangian submanifolds of dimension ≦3. Classification is done directly for genrating functions of Lagrangian submanifolds and contains both elementary singularities and non-elementary ones with continuous moduli. The results demonstrate, in particular, that in contrast to the non-equivariant case the classification of equivariant Lagrangian singularities is not subordinated to the classification of symmetric functions up to the right equivariant equivalences. 相似文献
49.
50.
Hexalkylditin is prepared by a Lewis acid-promoted (MgCl2) reductive reaction of bis(trialkyltin) oxide using magnesium metal as reducing agent. Hexabutyl- and hexaphenylditin are synthesized with 95% and 80% yield separately and a radical mechanism is proposed for the reaction condition. Unsymmetric ditin, Bu3Sn-SnPh3, was first synthesized by this reductive method. 相似文献
|