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1.
N. A. Yashtulov V. O. Zenchenko M. V. Lebedeva V. M. Samoilov O. Kh. Karimov V. R. Flid 《Russian Chemical Bulletin》2016,65(1):133-138
Palladium was combined with porous silicon into catalytically active functional electrode nanocomposites. Palladium nanoparticles were examined by transmission electron microscopy and atomic force microscopy; their catalytic activity was estimated using cyclic voltammetry. 相似文献
2.
JETP Letters - New measurements of the flux and spectrum of reactor antineutrinos as functions of the distance from the center of the core of the SM-3 reactor (Dimitrovgrad, Russia) in the range of... 相似文献
3.
S. M. Samoilov 《高分子科学杂志,C辑:聚合物评论》2013,53(2):333-399
Unlike ethylene, which is quite active in radical poly- and co-polymerization, the next member of the olefinic row–propylene (Pr)–is much less efficient in such reactions. Thermodynami-cally, the polymerization of Pr is permitted as is evidenced by reactions with Ziegler-Natta catalysts (The free energy change δG for the conversion of liquid Pr into amorphous poly-Pr at 25°C is -12.2 kcal/mol [1].), but the strong chain transfer activity of the Pr-monomer prevents formation of high molecular weight polymers via radical mechanism. Pr easily gives up H″ atoms with the formation of inactive and probably resonance stabilized allyl radicals CH2[sbnd]CH[sbnd]CH2 .(The high resonance stabilization of the Pr-radi-cal 'CH2 CH[dbnd]CH2, formed after separation of the H″ atom, should not be confused with a very low resonance stabilization of the Pr-radical 'CH2 [sbnd]CH[sbnd]CH3, formed after opening of the double bond. The Q–e scheme deals with the second type of radical and Pr is characterized by a low resonance factor, Qpr 0.002.) As a result, Pr radical homopolymerization gives low-molecular weight polymer (even at a pressure of 15,000 atm the molecular weight of poly-Pr is only ~3000 [2, 3]). 相似文献
4.
A study has been made of the piezoelectric constants of polycrystalline ferroelectrics of the barium titanate type and of their dependence on temperature of sintering of the ceramic and on the constant voltage applied. The measurements were made under static and dynamic conditions. It is shown that the piezomoduli of certain solid solutions in the systems Ba(Ti, Zr, Sn)O3 and Ba(Ti, Si, Sn)O3 are somewhat greater than those of barium titanate. 相似文献
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6.
The effect of short-term low-temperature annealing in air and in vacuum on the properties of HTSC films of YBCO is studied. It is shown that, under certain conditions of preparation of initial samples, a transition from the HTSC phase with the superconducting transition temperature Tc=90 K to a phase with Tc=60 K occurs without a noticeable change in the oxygen content. It is found that, as a result of short-term annealings, a transition from the HTSC phase with Tc=60 K to the phase with Tc=90 K can occur only through the vacuum annealing stage, which converts the sample into the superconducting state. Short-term annealings lead to multiple reversible “switching” of the films from one phase to another. The obtained results are of practical interest, since the proposed method can be used to quickly obtain superconducting YBCO films in various phase states. It is shown, in addition, that the annealing procedure makes it possible not only to increase the oxygen concentration but also to produce a structural rearrangement of a YBCO film. 相似文献
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8.
The possibility of improving the adsorbent efficiency by means of transverse, longitudinal sectioning of adsorption apparatus is substantiated. Results of an experimental and calculation study of sectioned apparatus are presented. A number of designs of sectioned adsorbers with the optimal working space were developed. 相似文献
9.
Dynamics of adsorption by zeolites from the liquid phase, simulated using data on adsorption statics
A mathematical model for calculation of the dynamics of liquid-phase adsorption in a fixed sorbent bed is constructed on the basis of material balance equations solved by numerical integration on the assumption of a constant mass-transfer coefficient and a limiting inner-diffusion resistance. 相似文献
10.
N. I. Ivanova N. K. Gusarova N. A. Konovalova L. M. Sinegovskaya V. G. Samoilov S. M. Markosyan N. D. Avseenko B. G. Sukhov B. A. Trofimov 《Russian Journal of General Chemistry》2006,76(1):98-102
Nucleophilic addition of secondary phosphone oxides and phosphine sulfides to 2-hydroxyacet-, 2-hydroxybenz-, and 3,4-dihydroxybenzaldehydes proceeds under mild conditions (48–50°C, THF) and allows tertiary phosphine oxides and phosphine sulfides with several hydroxyl groups to be prepared. 相似文献