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1.
We establish constructive existence conditions and construct a generalized Green operator for the construction of solutions
of a Noetherian linear boundary-value problem for a system of ordinary differential equations with switchings and pulse action
in critical and noncritical cases.
__________
Translated from Neliniini Kolyvannya, Vol. 10, No. 1, pp. 51–65, January–March, 2007. 相似文献
2.
L. A. Bondar' L. M. Kustov I. P. Beletskii A. Yu. Stakheev A. A. Chuiko V. B. Kazanskii 《Russian Chemical Bulletin》1991,40(10):1940-1943
Microporous silica gels containing small amounts of titanium ions are synthesized. Addition of Ti ions to the silica gels during the sol-forming step is demonstrated to increase the specific surface area and decrease the volume of sorptive pores. Spectral results indicate that Ti ions uniformly distribute in the silica gel matrix and isomorphously replace Si.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2217–2222, October, 1991. 相似文献
3.
4.
Cross-polarization 29Si NMR spectra have been used for aerosil modified by methylchlorosilanes to identify surface organosilicon compounds and their reactions during hydrolysis and methanolysis.Translated from Teoreticheskaya i Eksperimental'naya Khimiya, No. 3, pp. 378–383, May–June, 1986. 相似文献
5.
T. V. Kulik V. N. Barvinchenko B. B. Palyanitsa O. V. Smirnova V. K. Pogorelyi A. A. Chuiko 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2007,81(1):83-90
The interaction of cinnamic acid with the surface of highly dispersed silica is studied. The mechanisms of adsorption, chemisorption, and thermal transformations of cinnamic acid on the silica surface are proposed. The kinetic parameters of the chemical reactions on the surface of silica are calculated. 相似文献
6.
Synthesis of Polysiloxane Xerogels Using Tetraethoxysilane/(Diethylphosphatoethyl)triethoxysilane System 总被引:1,自引:0,他引:1
O. A. Dudarko I. V. Mel'nik Yu. L. Zub A. A. Chuiko A. Dabrowski 《Colloid Journal》2005,67(6):683-687
The xerogels, containing phosphonic acid groups ≡Si(CH2)2P(O)(OC2H5)2 in the surface layer of their particles, are synthesized by the sol-gel method (ethanol as a solvent and fluoride ion as a catalyst). It is shown that, when 2 : 1, 3 : 1, and 4 : 1 tetraethoxysilane/(diethylphosphatoethyl)triethoxysilane ratios are used, nonporous substances are formed, whereas, at 6 : 1, 8 : 1, and 10 : 1 ratios, the xerogels with highly porous structures are produced (the specific surface area is 505–534 m2/g, the sorption pore volume is 0.34–0.53 cm3/g, and the pore diameter is 3.6–4.6 nm). 相似文献
7.
O. I. Yakimova A. M. Eremenko A. A. Chuiko 《Reaction Kinetics and Catalysis Letters》1993,50(1-2):199-201
A photochemical model reaction between anthracene and N,N-diethylaniline on aerosil has been studied. It is found that the nature of the surface is responsible for the mechanism of intermolecular interaction (dynamic or static one). 相似文献
8.
B. G. Udarov É. N. Manukov O. G. Vyglazov V. A. Chuiko L. V. Izotova 《Chemistry of Natural Compounds》1986,22(4):398-403
The retention indices of synthesized alkyl derivatives of carane and of cycloheptane in capillary columns with tricresyl phosphate and squalane at 70°C have been determined. The influence of the structure of the hydrocarbons studied on the values of their retention parameters is considered. An estimate is given of the nature of the interrelationship between the physical properties of these hydrocarbons and their retention indices on a nonpolar stationary phase. 相似文献
9.
Starukh G. N. Smirnova N. P. Eremenko A. M. Chuiko A. A. Abdel-Shafi A. A. Worrall D. R. Wilkinson F. 《Theoretical and Experimental Chemistry》2001,37(2):103-107
We have used fluorescent spectroscopy and laser flash photolysis to investigate the photonics of pyrene molecules in a pyrene–-cyclodextrin inclusion complex in various media. We have observed a protective effect of -cyclodextrin relative to solubilized pyrene molecules during quenching of fluorescence by Ti ions (or titanium dioxide particles) in mixed colloids. In the presence of a precursor of silica (a TEOS solution), the pyrene molecules react with the colloidal silica particles formed, and the reaction is accompanied by decomposition of the pyrene–-cyclodextrin inclusion complex and efficient photoionization of pyrene. 相似文献
10.
A. A. Chuiko V. A. Tertykh V. A. Khranovskii Yu. P. Egorov L. M. Roev 《Theoretical and Experimental Chemistry》1967,2(2):189-193
The surface-chemical reactions of the chlorosilanes
$$\left( {\begin{array}{*{20}c} {} & {} & {} & {{\text{CH}}_{\text{3}} } & {} & {} & {{\text{CH}}_{\text{3}} } & {} \\ {} & {} & {} & {} & {} & {} & {} & {} \\ {{\text{CL}}_{\text{3}} {\text{SiH,}}} & {{\text{CL}}_{\text{3}} {\text{Si}}} & {} & {} & {,{\text{ ClSi}}} & {} & {} & {\text{H}} \\ {} & {} & {} & {} & {} & {} & {} & {} \\ {} & {} & {} & {\text{H}} & {} & {} & {{\text{CH}}_{\text{3}} } & {} \\ {} & {} & {} & {} & {} & {} & {} & {} \\ \end{array} } \right)$$ 相似文献