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4,369 results on '"Yu, I."'

14. Structure, Mineralogical, and Geochemical Features and Formation Conditions of Ore Veins in the Mo Porphyry Shakhtama Deposit (Eastern Transbaikalia)

Author

Yurgenson, G. A., primary, Kiseleva, G. D., additional, Dolomanova-Topol, A. A., additional, Kovalenker, V. A., additional, Petrov, V. A., additional, Yazykova, Yu. I., additional, Levitskaya, L. A., additional, Trubkin, N. V., additional, Taskaev, V. I., additional, and Karimova, O. B., additional

Published
2023
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19. Submarine Volcano 8.10 (Kuril Island Arc)

Author

Blokh, Yu. I., primary, Bondarenko, V. I., additional, Dolgal, A. S., additional, Novikova, P. N., additional, Petrova, V. V., additional, Pilipenko, O. V., additional, Rashidov, V. A., additional, and Trusov, A. A., additional

Published
2023
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42. Study of the Antiferromagnetic State Nematics in EuFe2As2 by Using Spin-Resonance and Magnetic Measurements

Author

Yu. I. Talanov, I. I. Gimazov, R. B. Zaripov, K. S. Pervakov, V. A. Vlasenko, V. M. Pudalov, and G. B. Teitelbaum

Subjects
Physics and Astronomy (miscellaneous)
Abstract

Using electron spin resonance spectroscopy and SQUID-magnetometry we obtained direct evidence of the occurrence of magnetic domains in the antiferromagnetically ordered state of a $${\text{EuF}}{{{\text{e}}}_{{\text{2}}}}{\text{A}}{{{\text{s}}}_{{\text{2}}}}$$ single crystal. The resonance spectra of europium ions were measured in the temperature range from 4 to 200 K. Using an equation for the resonance field in an antiferromagnet that takes into account the exchange and anisotropy fields, we have performed an analysis of the angular dependence of the spectrum at a temperature of 4.8 K, measured upon the crystal rotation around the c axis. Data analysis showed that $${\text{EuF}}{{{\text{e}}}_{{\text{2}}}}{\text{A}}{{{\text{s}}}_{{\text{2}}}}$$ is the antiferromagnet with easy anisotropy plane. Besides, we found in the $$ab$$-plane the second order axes of easy magnetization for each of the two types of magnetic domains, related to the structural transition and the formation of twins. Magnetic anisotropy caused by the exchange interaction of europium ions with iron ions indicates the occurrence of nematic magnetic ordering in the basal $$ab$$ plane. An estimate of the magnitude of the exchange field and the anisotropy field is obtained from the angular dependence of the resonance fields.

Published
2023

47. Polyunsaturated Fatty Acid Content in the Muscles of Alien Fish Species of the Rybinsk Reservoir

Author

Yu. Yu. Dgebuadze, N. N. Sushchik, Yu. V. Gerasimov, Yu. I. Solomatin, and M. I. Gladyshev

Subjects
Aquatic Science, General Agricultural and Biological Sciences
Abstract

Abstract The biochemical composition of the muscles of two fish species, European smelt Osmerus eperlanus and the Common (Caspian) kilka Clupeonella cultriventris, that were successively invaded and naturalized in the Rybinsk Reservoir in the second half of the 20th century, differs significantly in the fatty acid content. The sum content (mg/g) of eicosapentaenoic (20:5n-3) and docosahexaenoic (22:6n-3) polyunsaturated fatty acids in the muscle tissue of the kilka is almost four times higher than that in European smelt. Given that smelt and the kilka are similar in their ecological and morphological characteristics and do not differ significantly in the composition of their diet in the Rybinsk Reservoir, it is obvious that the observed differences primarily result from the phylogenetic aspect. The obtained data on the composition of the fatty acids of the invaders show that the replacement of one alien species with another (European smelt with the kilka) significantly changed the quality of production of an important link in the trophic web of the reservoir.

Published
2023

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