全文获取类型
收费全文 | 198篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
化学 | 119篇 |
力学 | 1篇 |
数学 | 29篇 |
物理学 | 51篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 8篇 |
2018年 | 14篇 |
2017年 | 7篇 |
2016年 | 7篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 14篇 |
2012年 | 6篇 |
2011年 | 9篇 |
2010年 | 7篇 |
2009年 | 5篇 |
2008年 | 19篇 |
2007年 | 9篇 |
2006年 | 11篇 |
2005年 | 9篇 |
2004年 | 5篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 5篇 |
1998年 | 4篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1972年 | 3篇 |
1971年 | 1篇 |
1970年 | 2篇 |
1967年 | 1篇 |
1964年 | 1篇 |
1961年 | 3篇 |
1960年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有200条查询结果,搜索用时 171 毫秒
51.
A. I. Mikaya V. G. Zaikin R. L. Ushakova L. I. Ukhova N. F. Marchenko 《Chemistry of Heterocyclic Compounds》1986,22(9):983-985
The mass spectra of the appropriate 4-ethyl derivatives, which provide the determination of the configuration of the 4 position in the initial alcohols, are registered in the chromato-mass spectrometric investigation of mixtures of the stereoisomeric 4-vinyl-trans-decahydroquinol-4-ols using a microreactor for hydrogenation; the microreactor is placed before or after the chromatographic column.Communication 13 of the series Reaction chromato-mass spectrometry. For Communication 12, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1215–1217, September, 1986 相似文献
52.
Yu. A. Aizina I. B. Rozentsveig I. V. Ushakova G. G. Levkovskaya A. N. Mirskova 《Russian Journal of Organic Chemistry》2005,41(1):91-94
Reactions of N-(2,2,2-trichloroethylidene)arenesulfonamides with thiophene, 2-chlorothiophene, and 2,5-dichlorothiophene, as well as of N-(2,2,2-trichloro-1-hydroxyethyl)arenesulfonamides with 2-chlorothiophene, lead to formation of the corresponding N-(2,2,2-trichloro-1-thienylethyl)arenesulfonamides. Alkaline hydrolysis of the latter occurs selectively at the trichloromethyl group to give N-arylsulfonyl-α-thienylglycines.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 1, 2005, pp. 93–96.Original Russian Text Copyright © 2005 by Aizina, Rozentsveig, Ushakova, Levkovskaya, Mirskova. 相似文献
53.
M.-G. A. Shvekhgeimer O. A. Ushakova V. V. Nesterov M. Yu. Antipin 《Chemistry of Heterocyclic Compounds》2005,41(2):181-186
2-Cyanoaryldiazonium bisulfates, obtained by the action of nitrosyl sulfuric acid on isatin 3-hydrazone and its 5-bromo and 5-nitro derivatives, couple with 1-aryl-3-methylpyrazol-5-ones and form 4-arylhydrazones of 1-aryl-3-methylpyrazole-4,5-diones. It was established on the basis of data of IR, UV, and 1H NMR spectra and of X-ray structural analysis that the coupling products exist in the hydrazone form stabilized by an intramolecular hydrogen bond.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 210–215, February, 2005. 相似文献
54.
Photoinduced dispersion polymerization of styrene in the presence of dibenzyl ketone as a photoinitiator, with or without magnetic field, has been followed with time. The experiments were carried out at low degrees of conversion of monomer. Since the conditions of the polymerization reaction (viscosity of the medium, reagents concentration, etc.) were approximately unchanged, the results were explained on the basis of a simplified model of dispersion polymerization. The normal growth of the polymerization rates with temperature was registered, and the activation energy of the polymerization was estimated to be about 12 kJ/mol in the temperature range from 20 to 60 °C. The magnetic field effect was best seen at low temperature. The maximum yield of the polymerization product increases by 20% when the magnetic field of 1000 G was applied at the temperature of 20 °C. 相似文献
55.
We give criteria for the boundedness of integral operators with nonnegative monotone kernel in the weighted Lebesgue spaces on a half-axis. 相似文献
56.
A. S. Filippov I. A. Korotkin I. O. Urazov O. A. Ushakova V. A. Vasil’ev 《Journal of Engineering Thermophysics》2008,17(3):218-226
Some estimates of the distribution of the electric field and current in a vertical electrolyzer are made. The homogeneity
criterion, connecting electrode sizes, working space thickness, electrolyte conductivity, and electrode conductivity is obtained.
This criterion is verified in numerical calculations. The effects of the gas phase in a vertical electrolyzer are estimated
under homogeneous and nonhomogeneous distributions of the potential with height in the working space. It is shown that, under
conditions when two-phase models of a liquid with bubbles can be used, the effect of the gas phase on the potential and current
distributions with height is insignificant in a number of cases. The research results can be used to select proper electrode
materials and to verify and interpret the results of numerical modeling of two-phase electrolyte hydrodynamics in the working
space of a vertical electrolyzer. 相似文献
57.
58.
59.
60.