全文获取类型
收费全文 | 1027篇 |
免费 | 10篇 |
国内免费 | 1篇 |
专业分类
化学 | 617篇 |
晶体学 | 10篇 |
力学 | 16篇 |
数学 | 130篇 |
物理学 | 265篇 |
出版年
2022年 | 13篇 |
2021年 | 22篇 |
2020年 | 32篇 |
2019年 | 10篇 |
2018年 | 31篇 |
2017年 | 22篇 |
2016年 | 28篇 |
2015年 | 17篇 |
2014年 | 19篇 |
2013年 | 34篇 |
2012年 | 44篇 |
2011年 | 53篇 |
2010年 | 45篇 |
2009年 | 46篇 |
2008年 | 30篇 |
2007年 | 33篇 |
2006年 | 28篇 |
2005年 | 23篇 |
2004年 | 24篇 |
2003年 | 23篇 |
2002年 | 28篇 |
2001年 | 18篇 |
2000年 | 22篇 |
1999年 | 10篇 |
1998年 | 12篇 |
1997年 | 17篇 |
1996年 | 9篇 |
1995年 | 19篇 |
1994年 | 12篇 |
1993年 | 14篇 |
1992年 | 20篇 |
1991年 | 23篇 |
1990年 | 20篇 |
1989年 | 24篇 |
1988年 | 17篇 |
1987年 | 17篇 |
1986年 | 13篇 |
1985年 | 22篇 |
1984年 | 10篇 |
1983年 | 6篇 |
1982年 | 8篇 |
1981年 | 13篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1976年 | 17篇 |
1975年 | 10篇 |
1974年 | 14篇 |
1968年 | 8篇 |
排序方式: 共有1038条查询结果,搜索用时 93 毫秒
11.
Theoretical and experimental aspects of the study of the e-- problem in effects of neutral weak currents in colliding e+e– beams in the region of the Z resonance are discussed. Quantities that describe the degree of violation of e-- universality are analyzed. In particular, it is shown that by measuring the spin asymmetry for angles 160° it is possible to determine the degree of violation ofl-e universality =g
A
e
g
V
l
–g
V
e
g
A
l
to an accuracy of up to 0.01.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 88-91, May, 1989. 相似文献
12.
In the framework of a minimal supersymmetric (s) extension of the standard Glashow-Weinberg-Salam theory, creation of s-partners of known leptons and gauge bosons in the
-annihilation is studied. The angle distributions and total cross sections of s-particle creation are investigated in detail. The comparison with similar processes with the participation of known particles is performed. The possibility of an experimental identification of s-particles in the
-annihilation is analyzed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 68–74, October, 1989.The authors thank I. M. Zheleznykh for useful discussions. 相似文献
13.
4-Isopropoxalyl-1,5-diphenyl-2,3-dihydro-2,3-pyrroledione reacts with thiosemicarbazide to form (3aS*)(4R*)(6aR*)-4,6a-dihydroxy-4-isopropoxycarbonyl-1-thiocarbamoyl-3,5-diphenyl-1,3a,4,5,6,6a-hexahydropyrrolo[3,4-d]pyrazol-6-one. The molecular and crystal structure of the latter was studied by single crystal X-ray diffraction. 相似文献
14.
15.
16.
Institute of Chemical Physics, Academy of Sciences of the USSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 3, pp. 113–115, May–June, 1991. 相似文献
17.
F. Y. Iskander 《Journal of Radioanalytical and Nuclear Chemistry》1992,159(1):105-110
A cigarette brand manufactured in the Republic of China was analyzed by instrumental neutron activation analysis to determine the concentration of 27 elements in cigarette tobacco, cigarette wrapping paper, cigarette filter before and after smoking and in the dropped ash. The results were compared to the literature values for American and other international cigarette brands. 相似文献
18.
V. V. Kuznetsov A. Pal'ma A. é. Aliev M. Fernandes N. S. Prostakov A. V. Varlamov 《Chemistry of Heterocyclic Compounds》1993,29(6):671-675
The cydization of 1-allyl-1-arylaminocyclohexanes under conditions of acid catalysis afforded 1,2,3,4-tetrahydro-4-methylspiro [quinoline-2-cyclohexanes] methyl (methoxy)-substituted in the phenylene ring. Their mono- and dinitro derivatives were synthesized, and their structure was established. Propositions on the direction of the nitration reaction of these heterocyclic compounds were expressed.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 784–788, June, 1993. 相似文献
19.
20.
Russian Chemical Bulletin - 相似文献