全文获取类型
收费全文 | 1353篇 |
免费 | 11篇 |
国内免费 | 6篇 |
专业分类
化学 | 619篇 |
晶体学 | 13篇 |
力学 | 90篇 |
数学 | 198篇 |
物理学 | 450篇 |
出版年
2022年 | 16篇 |
2021年 | 16篇 |
2020年 | 29篇 |
2019年 | 24篇 |
2018年 | 28篇 |
2017年 | 36篇 |
2016年 | 46篇 |
2015年 | 13篇 |
2014年 | 36篇 |
2013年 | 39篇 |
2012年 | 51篇 |
2011年 | 67篇 |
2010年 | 56篇 |
2009年 | 41篇 |
2008年 | 54篇 |
2007年 | 51篇 |
2006年 | 45篇 |
2005年 | 35篇 |
2004年 | 45篇 |
2003年 | 30篇 |
2002年 | 20篇 |
2001年 | 39篇 |
2000年 | 26篇 |
1999年 | 14篇 |
1998年 | 14篇 |
1997年 | 25篇 |
1996年 | 16篇 |
1994年 | 19篇 |
1993年 | 12篇 |
1992年 | 13篇 |
1991年 | 19篇 |
1990年 | 15篇 |
1989年 | 27篇 |
1988年 | 15篇 |
1987年 | 21篇 |
1986年 | 14篇 |
1985年 | 26篇 |
1984年 | 13篇 |
1982年 | 15篇 |
1981年 | 15篇 |
1980年 | 11篇 |
1979年 | 12篇 |
1978年 | 17篇 |
1976年 | 23篇 |
1975年 | 16篇 |
1974年 | 11篇 |
1973年 | 11篇 |
1972年 | 11篇 |
1969年 | 14篇 |
1968年 | 17篇 |
排序方式: 共有1370条查询结果,搜索用时 15 毫秒
41.
V. I. Makarov N. L. Lavrik G. I. Skubnevskaya N. M. Bazhin 《Reaction Kinetics and Catalysis Letters》1979,12(3):225-227
Sulfur dioxide fluorescence and phosphorescence are quenched by a magnetic field. A model is suggested for the qualitative interpretation of the results.
. , - .相似文献
42.
A. A. Makarov 《Applied physics. B, Lasers and optics》1982,29(4):287-290
For the detection of the rare radioactive isotope41Ca, the possibilities of the earlier-proposed initial-state enrichment by continuous-wave laser radiation are examined. It is shown that the enrichment 1014 of 3d-states of the ion Ca II can be reached. As the method of enriched-state detection, the process of resonant charge exchange is analysed. For a further increase of the selectivity, the repetition of the cycle initial state enrichment plus resonant charge exchange is discussed. 相似文献
43.
V. K. Rybin A. Georgopulos N. V. Makarov G. S. Katrukha 《Chemistry of Natural Compounds》1989,25(2):205-209
The modification of the - and -NH2 groups of sturins A and B — protamines fromAcipenser güldenstadti — with succinic anhydride has been studied. Succinylation was carried out at 20°C, pH from 7.5 to 10.5, using a 50 to 180-fold excess of succinic anhydride. The modification products were separated by reversed-phase HPLC on a Zorbax ODS column. A linear relationship has been established between the retention times of the succinyl derivatives and the number of succinyl groups introduced. The influence of the pH and of the excess of succinic anhydride on the modification of the sturins has been studied by the method of experimental planning and mathematical modeling. The optimum conditions have been found for the succinylation of the proteins: a 150- to 180-fold excess of succinic anhydride and pH values of 9.8–10.2 for sturin A and of 8.4–9.4 for sturin B.Moscow Technological Institute of the Meat and Dairy Industry. All-Union Scientific-Research Institute for the Search for New Antibiotics, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 238–243, March–April, 1989. 相似文献
44.
V. A. D’yakonov A. A. Makarov E. Kh. Makarova L. M. Khalilov U. M. Dzhemilev 《Russian Journal of Organic Chemistry》2012,48(3):349-353
Cyclomagnesiation of nitrogen-containing 1,2-dienes with Grignard compounds in the presence of activated magnesium and Cp2TiCl2 as catalyst afforded 2,5-bis(aminoalkylidene)magnesacyclopentanes in high yield. 相似文献
45.
46.
47.
48.
A new method has been proposed for obtaining a beam of monoenergetic neutrons with almost arbitrary energies. The production of the beam for the calibration of a dark-matter detector with liquid argon as a working medium has been described. 相似文献
49.
AbstractThe reaction between glutathionylcobalamin (GSCbl), a complex of Co(III)-cobalamin with glutathione, and selenocysteine (Sec) was investigated using ultraviolet-visible (UV–vis) spectroscopy. The interaction results in the formation of cob(II)alamin and proceeds via two pathways: (i) a rapid formation of complex between GSCbl and Sec followed by the rate-determining substitution of glutathionyl-ligand by Sec and rapid electron-transfer from Se-atom to Co(III)-ion and (ii) a nucleophilic attack of Co(III)-S bond by Sec. 相似文献
50.
Mokrushina A. N. Plotnikov V. A. Dem’yanov B. F. Makarov S. V. 《Technical Physics》2019,64(6):853-857
Technical Physics - The crystalline structure of intermetallic Cu3Sn synthesized by successively condensing thin layers of copper and tin on a substrate at 150°C has been studied. Cu3Sn... 相似文献