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308 results on '"Dychko, A."'

301. DESIGN, USE AND REPAIR OF RAILROAD CARS: SELECTED ARTICLES

Author

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO, Dychko,A. A., FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO, and Dychko,A. A.

Abstract

Contents: Dependence of coefficient of friction on the difference of potentials of rubbing metals; Dependence of coefficient of friction on potential difference of rubbing metals and surface microcells; Dependence of the coefficient of friction and wear on stresses in surface layer of rubbing bodies; Physical bases of the nature of friction, wear and gripping of metals at low temperatures. (Author), Edited machine trans. of Institut Inzhenerov Zheleznodorozhnogo Transporta, Omsk. Trudy (USSR) v43 p117-25, 197-210, 221-35 1963.

Published
1967

303. [[Durable persistence of a biocompatible foreign body in a vertebral channel in open penetrating trauma of a spinal cord: clinico-experimental and pathomorphological peculiarities].]

Author

Vi, Tsymbalyuk, Vv, Medvedyev, Vera Semenova, Ny, Grydina, Yy, Yaminskyi, Yy, Senchyk, Ng, Draguntsova, Oa, Rybachuk, Sm, Dychko, and Ti, Petriv

Subjects
Male, Acrylamides, Wound Healing, Spinal Cord, Animals, Biocompatible Materials, Hydrogels, Wounds, Penetrating, Recovery of Function, Foreign Bodies, Spinal Cord Compression, Spinal Cord Injuries, Rats
Abstract

Simulation model of open penetrating wound of a spinal cord (SC) with its durable com- pression by biocompatible foreign body, was tasted. Experimental animals - mature male rats (inbred line, descendent from a Wistar breed); the trauma simulation model - a left- sided transsection of the SC half on the Txi level; experimental groups: the main (a SC trau- ma + homotopic implantation of microporous hydrogel fragment - foreign body [n=10]), groups of comparison (the SC trauma [n=16]; the SC trauma + homotopic implantation of chemically identical analogue of hydrogel - NeuroGelTM [n=20]). A SC compression by a foreign body worsens the regeneration process course essentially: during first 2 mo the function index of a hind ipsilateral extremity in experimental animals of the main group was the lowest in the experiment - (1.30 ? 0.94) points in accordance to BBB scale, during 3 - 4 mo - the function index had enhanced trustworthy - up to (2.35 ? 0.95) points in accor- dance to BBB scale, what is connected with lowering of a local pressure on a SC tissue due to change of the foreign body form and volume. In 24 weeks the function index of hind ipsi- lateral extremity had constituted (8.45 ? 0.92) points - while application of NeuroGeTM and (2.35 ? 0.95) points - of the foreign body; the tissue processes in the implants localization zone had differed essentially. The tasted simulation model reproduces satisfactory a mechanical component of the foreign body impact on a SC tissue. The SC compression reduction, even in a late follow-up period, had improved the conditions and results of recenerative process essentially.

304. Methods of control and monitoring of pollutants in groundwaters

Author

Dychko, A. O. and Dychko, A. O.

Abstract

Загрязнение водных объектов, источников питьевого водоснабжения, из-за неэффективной работы очистных сооружений влечет за собой ухудшение качества питьевой воды. В случае использования подземных вод в качестве источника питьевой воды, необходимо очищать их от соединений железа, фтора, марганца, аммиака, а также минеральных солей. Целью исследования является разработка систем контроля и мониторинга загрязняющих веществ в подземных водах.

306. Synthesis of Fe/TaON/β-Si3N4/β-Si3Al3O3N5 Composites for Photocatalytic Degradation of Chloramphenicol in Water.

Author

Skvortsova, L. N., Kazantseva, K. I., Bolgaru, K. A., Reger, A. A., Artyukh, I. A., and Dychko, K. A.

Subjects
*PHOTODEGRADATION, *CHLORAMPHENICOL, *VISIBLE spectra, *PHOTOCATALYSTS, *TANTALUM, *SILVER
Abstract

Fe/TaON/β-Si3N4/β-Si3Al3O3N5 metal–ceramic composites have been prepared via autowave combustion of ferrosilicoaluminum and metallic tantalum additions (0, 5, 10, and 15 wt %) in nitrogen. We have determined the phase composition of the composites and studied their morphological features and optical properties. Acid–base properties of the surface of the composites have been investigated and their adsorptive and photocatalytic activity for chloramphenicol degradation has been assessed under UV and visible light illumination. The composites have been shown to be highly effective in oxidative degradation of chloramphenicol (98%) under illumination with visible light. [ABSTRACT FROM AUTHOR]

Published
2023
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307. Photocatalytic Degradation of Pharmaceutical Pollutants Under UV and Visible Light Using Ironcontaining Metal-Ceramic Composites.

Author

Skvortsova, L. N., Bolgaru, K. A., Kazantseva, K. I., Tikhonova, I. A., Reger, A. A., and Dychko, K. A.

Subjects
*IRRADIATION, *VISIBLE spectra, *PHOTODEGRADATION, *POLLUTANTS, *HETEROGENEOUS catalysis, *HOMOGENEOUS catalysis, *BAND gaps
Abstract

The adsorption and photocatalytic activity of iron-containing metal-ceramic composites produced by the selfpropagating combustion of aluminum ferrosilicon in nitrogen with the addition of metallic tantalum (0, 5, 10, 15 wt.%) during oxidative degradation of pharmaceutical pollutants (chloramphenicol, metamizole, cinnarizine) under UV and visible light was evaluated. The phase composition of the composite materials was determined by X-ray diffraction and infrared spectroscopy. The morphological features and optical properties of the composites were investigated, and the band gaps of the semiconductors included in the ceramic matrix were determined. The acid properties of the surface of the composites were studied using pH-metry and the Hammett indicator. The correlation of the number of surface-active sites and adsorption of pollutants with the corresponding value of pКa was shown, and the mechanisms of adsorption were proposed. Optimal conditions for the oxidative degradation of chloramphenicol (~100%) under visible light were found: a composite (5% Ta) with the addition of H2O2 to combine heterogeneous catalysis with the homogeneous photo-Fenton system. [ABSTRACT FROM AUTHOR]

Published
2023
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