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A. M. Vinogradov 《Acta Appl Math》1986,5(2):169-180
First we propose a model of visual perception essentially based on the Keldysh-Chernavsky-Sossinsky three-channel theorem, from which three-dimensionality of space follows. Second, we associate with a system of subgroups H
1, ..., Hs of a given group G a geometric object, called a group crystal, in order to visualize G. How this notion works is illustrated via the Burnside problem. 相似文献
14.
V. A. Tartakovskii A. S. Ermakov Yu. A. Strelenko D. B. Vinogradov E. Yu. Petrov 《Russian Journal of Organic Chemistry》2005,41(1):120-123
A practical procedure has been proposed for the synthesis of functionally substituted 4,5-dihydro-1,2,3-oxadiazole 2-oxides on the basis ofsulfamic acid derivatives.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 1, 2005, pp. 121–123.Original Russian Text Copyright © 2005 by Tartakovskii, Ermakov, Strelenko, Vinogradov, Petrov. 相似文献
15.
S. A. Shevelev V. M. Vinogradov I. L. Dalinger T. I. Cherkasova 《Russian Chemical Bulletin》1993,42(11):1857-1861
A method for the synthesis of bi-, ter-, and quaterpyrazoles by cyclization ofC-(diformylmethyl)nitropyrazoles with hydrazine has been elaborated. Some of theirC- andN-derivatives have been obtained. The compounds prepared have been characterized by1H,13C,14N, and15N NMR spectra.For communication 6, see Ref. 1.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1941–1945, November, 1993. 相似文献
16.
N. U. Baratov E. G. Mil'grom V. I. Vinogradov Ya. V. Rashkes M. S. Yunusov 《Chemistry of Natural Compounds》1994,29(6):748-759
Fourteen previously undescribed bases of the bis--phenylethylbenzylamine series with a central diphenyl ether group differing by the relative positions of the oxygen bridge and the -phenylethylbenzylamine substituent have been synthesized. The main directions of the fragmentationof these compounds under electron impact are competing single or successive processes of cleavage of the benzyl bonds, accompanied by the structuredependent transfer of hydrogen atoms.Institute of the Chemistry of Plant Substances, Uzbekistan Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii. No. 6, pp. 839–853, November–December, 1993. 相似文献
17.
A. A. Berlin G. A. Vinogradov A. A. Ovchinnikov 《International journal of quantum chemistry》1972,6(2):263-269
The paramagnetic properties of one-dimensional macromolecules with conjugated C?C bonds are discussed on the basis of low-lying quasi-homeopolar triplet excitations. A good agreement with the experimental results is shown. 相似文献
18.
A set of amino-group possessing cyanine dyes is obtained from their N-acetyl derivatives via deprotection with boron trifluoride-methanol complex in good yields. 相似文献
19.
O. P. Vinogradov 《Mathematical Notes》1977,22(4):809-811
A class of weakly aging distribution functions is introduced and a number of properties of this class are derived. It is proved in particular that a random variable , having a weakly aging distribution function, can be written as a sum of two independent random variables, one of which has exponential distribution with a parameter equal to the modulus of the singular point of Me–s nearest the coordinate origin.Translated from Matematicheskie Zametki, Vol. 22, No. 4, pp. 571–574, October, 1977. 相似文献
20.
N. A. Chumaevskii M. N. Rodnikova S. A. Vinogradov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2006,80(10):1548-1553
Based on Raman spectra of light, heavy, and half-heavy water in the region of O-H and O-D stretching vibrations and on the independent-oscillator model, it is shown that a peculiarity of the liquid state of water is the nonequivalence of O-H groups of water molecules in hydrogen bonding. The structure of liquid water and the mechanism of its molecular mobility are considered in this context. 相似文献