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1.
M. I. Oshtrakh O. B. Milder V. A. Semionkin L. I. Malakheeva P. G. Prokopenko 《Journal of Radioanalytical and Nuclear Chemistry》2006,269(3):671-677
Summary Characterization of iron storage proteins in liver and spleen from normal chicken and chicken with lymphoid leukemia in comparison
with human liver ferritin were considered by M?ssbauer spectroscopy (preliminary results). Small differences in M?ssbauer
hyperfine parameters for both normal and lymphoid leukemia chicken liver and spleen were observed. The value of quadrupole
splitting for human liver ferritin was higher than those for chicken tissues. A decrease of iron content in lymphoid leukemia
chicken tissues was also found, however, the reason of this fact (pathology or feeding) was not clear yet. 相似文献
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S. P. Denisov V. N. Evdokimov A. V. Kozelova N. N. Prokopenko M. M. Soldatov D. A. Stoyanova V. I. Yakimchuk 《Bulletin of the Lebedev Physics Institute》2010,37(4):104-110
The Cherenkov counter for measuring the numbers of protons in bunches extracted from the IHEP accelerator using a slow extraction
system is described. The measurement range is from 1 to 106 particle/bunch. The maximum bunch frequency is 6 · 106 s–1. Cherenkov light is measured by an XP 2020 photomultiplier. The results of measurements of the XP 2020 signal amplitude on
the applied voltage, obtained using semiconductor light sources are presented. The data of counter calibration on the proton
beam are discussed. 相似文献
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Azatyan V. V. Alymov M. I. Prokopenko V. M. Abramov S. K. Kazanskii V. B. 《Kinetics and Catalysis》2022,63(4):412-417
Kinetics and Catalysis - The kinetic characteristics of propagating flame were shown to depend on the chemical properties of the contacting solid surface and on the rates of heterogeneous... 相似文献
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A. N. Kornienko S. G. Pil’o V. M. Prokopenko V. S. Brovarets 《Russian Journal of General Chemistry》2014,84(6):1186-1189
Chlorination of 2-aryl-5-benzylsulfanyl-1,3-oxazole-4-carbonitrile in aqueous acetic acid at 50–60°C afforded new 2-aryl-5-chloro-1,3-oxazole-4-carboxamides. The reactivity of the chlorine atom with respect to the N-, O-, and S-nucleophiles was investigated. 相似文献
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A. V. Pashchenko V. P. Pashchenko V. K. Prokopenko V. A. Turchenko Yu. F. Revenko A. S. Mazur V. Ya. Sycheva N. A. Liedienov V. G. Pitsyuga G. G. Levchenko 《Journal of Experimental and Theoretical Physics》2017,124(1):100-113
The structure, the structure imperfection, and the magnetoresistance, magnetotransport, and microstructure properties of rare-earth perovskite La0.3Ln0.3Sr0.3Mn1.1O3–δ manganites are studied by X-ray diffraction, thermogravimetry, electrical resistivity measurement, magnetic, 55Mn NMR, magnetoresistance measurement, and scanning electron microscopy. It is found that the structure imperfection increases, and the symmetry of a rhombohedrally distorted R3?c perovskite structure changes into its pseudocubic type during isovalent substitution for Ln = La3+, Pr3+, Nd3+, Sm3+, or Eu3+ when the ionic radius of an A cation decreases. Defect molar formulas are determined for a real perovskite structure, which contains anion and cation vacancies. The decrease in the temperatures of the metal–semiconductor (T ms) and ferromagnet–paramagnet (T C) phase transitions and the increase in electrical resistivity ρ and activation energy E a with increasing serial number of Ln are caused by an increase in the concentration of vacancy point defects, which weaken the double exchange 3d 4(Mn3+)–2p 6(O2–)–3d 3(Mn4+)–V (a)–3d 4(Mn3+). The crystal structure of the compositions with Ln = La contains nanostructured planar clusters, which induce an anomalous magnetic hysteresis at T = 77 K. Broad and asymmetric 55Mn NMR spectra support the high-frequency electronic double exchange Mn3+(3d 4) ? O2–(2p 6) ? Mn4+(3d 3) and indicate a heterogeneous surrounding of manganese by other ions and vacancies. A correlation is revealed between the tunneling magnetoresistance effect and the crystallite size. A composition–structure imperfection–property experimental phase diagram is plotted. This diagram supports the conclusion about a strong influence of structure imperfection on the formation of the magnetic, magnetotransport, and magnetoresistance properties of rare-earth perovskite manganites. 相似文献
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