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51.
T. V. Vasina E. G. Khelkovskaya-Sergeeva A. A. Klyuchanskii O. V. Bragin 《Russian Chemical Bulletin》1989,38(4):692-695
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The catalytic properties of ferri- and borosilicates modified with group VIII metals and Al-containing pentasils are essentially dependent on the acid properties of the corresponding H forms of the zeolites.
The data obtained in transformations of n-hexane indicate the bifunctional character of the effect of the modified elemental silicates and pentasils. 相似文献
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Daria Dzema Liudmila Kartsova Diana Kapizova Dietmar Appelhans 《Chromatographia》2017,80(11):1683-1693
Core–shell-type polymers based on a hyperbranched (hb) poly(ethylenimine) core and a shell with a variable maltose content were applied as coating materials for fused silica capillaries. A new, simple, fast, and reproducible way of modifying the capillary walls through the physical adsorption of the core–shell-type polymers using a Cu2+ support was developed. The coating created by this method was found to be very stable compared to the coating created using a solution of the polymer only. Capillaries modified with the core–shell-type polymers were tested by applying them to the electrophoretic separation of catecholamines and proteins. The modified capillaries showed high efficiencies (up to 800,000 theoretical plates per meter for lysozyme) and separation selectivities. The highest efficiency was achieved using capillaries modified with the polymer containing the lowest content of maltose in the shell and the most accessible positively charged core. Various online concentration techniques were also tested as a means to lower detection limits further, making it possible to analyze proteins in biological fluids (saliva) as well as catecholamines in human urine after SPE using activated alumina. 相似文献
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Liudmila Kulakova Vladislav Gorelov Andrey Lutetskiy Nikita S. Averkiev 《Solid State Communications》2012,152(17):1690-1693
The paper is devoted to an acousto-electron effect in the nanodimensional laser heterostructures. The effect results in a modulation of the laser emission intensity as well as in a turn of the emission polarization by the sound strain. Theoretical treatment of the experimental data is presented. 相似文献
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Tatjana Gric Liudmila Nickelson Romanas Martavicius 《Applied Physics A: Materials Science & Processing》2014,115(2):575-580
Here we present the analyses of the open (without a metal screen) ridged and photonic waveguide structures by means of the electrodynamical rigorous method of the Singular Integral Equations (SIE). The waveguides are made of a lossy silicon carbide (SiC) material. We have discovered peculiarities of the dispersion characteristics. We have found the numerical solutions to the complex wave equations. The dispersion characteristics of both waveguide structures are numerically analyzed and compared with each other. It was found that the losses of modes propagating in the waveguide structure with air openings (channels) are smaller than the losses in the waveguide structure without air openings. We came to the conclusion that it is possible to optimize the dispersion characteristics by adding openings of different shapes and sizes into the waveguide structures. 相似文献
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The intramolecular zinc bis-proline-phenol complex 2a was found to promote enantioselective iodolactonization reactions of both electron-rich and electron-poor 5-aryl-5-hexenoic acids affording δ-iodolactones in good chemical yields with up to 82% enantiomeric excess. The reactions were found to be insensitive to air and moisture, providing an experimentally simple protocol for synthetically useful compounds. 相似文献
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