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G. A. Kovaleva 《Mathematical Notes》1968,3(4):257-263
The possible existence of a tube of negative Gaussian curvature with a closed asymptotic line is investigated, and an example of a closed asymptotic strip homotopic to a cylinder is formulated.Translated from Matematicheskie Zametki, Vol. 3, No. 4, pp. 403–414, April, 1968.I would like in conclusion to express my sincere appreciation to my academic sponsor and to the participants of the Seminar on Geometry in the Large for their interest and advice. 相似文献
44.
The scattering of quasichanneled particles on atomic chains and planes is studied by computer simulation for the crystals of chemical compounds. It is shown that quasichanneling is the specific regime of ion motion in the lattice. Its main features are: (1) a sharp increase of the backscattering probability; (2) transition of the ions from the quasichanneled component into a random one; (3) high sensitivity to the structure and the composition of the atomic “chain”; (4) dependence on the value and the direction of the atomic displacements. 相似文献
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Abstract The effect has been studied of additive coloring on the magnitude of ion conductivity of RbAg4I5 crystals. It has been found that slight changes of silver stoichiometry of 10?3 at.% can lead to considerable variations of the ionic conductivity Δ[sgrave]i/[sgrave]i ? 0.1. The dependence has been observed of the magnitude of ion conductivity on the ratio between the integral intensities of the main bands in the photoluminescence spectrum of the γ-phase of RbAg4I5 which associated with the luminescence centres containing vacancies and interstitials of silver cations. 相似文献
46.
Kovaleva V. V. Kuznetsov N. M. Vdovichenko A. Yu. Zagoskin Y. D. Grigoriev T. E. Chvalun S. N. 《Doklady Physical Chemistry》2022,502(2):23-27
Doklady Physical Chemistry - The rheological behavior of a 1 wt % suspension of highly porous chitosan particles in polydimethylsiloxane in a high electric field has been studied as a function of... 相似文献
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We propose a novel robust optimization approach to analyze and optimize the expected performance of supply chain networks. We model uncertainty in the dema 相似文献
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External electric field effect on electronic properties and charge transfer in CoI2/NiI2 spinterface
Iuliia Melchakova Evgenia A. Kovaleva Natalia S. Mikhaleva Felix N. Tomilin Sergey G. Ovchinnikov Alexander A. Kuzubov Paul Avramov 《International journal of quantum chemistry》2020,120(3):e26092
Electronic structure and spin-related properties of CoI2/NiI2 heterostructure were studied by means of density functional theory. It was shown that the electronic structure at the Fermi level can be characterized by a band gap. The effect of the external electric field on charge transfer and electronic properties of the CoI2/NiI2 interface was investigated, and it was found that band gap width depends on the strength of the applied electric field, switching its nature from semiconducting to a half-metallic one. An easy control of the electronic properties and promising spin-polarized nature of the CoI2/NiI2 spinterface allows the heterostructure to be used in spin-related applications. 相似文献
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G. F. Makhaeva A. N. Proshin N. P. Boltneva E. V. Rudakova N. V. Kovaleva O. G. Serebryakova I. V. Serkov S. O. Bachurin 《Russian Chemical Bulletin》2016,65(6):1586-1591
Detailed studies of properties of new 3-substituted 5-anilino-1,2,4-thiadiazoles containing different substituents at position 3 of the thiadiazole ring were carried out, in particular, their esterase profile and antioxidant properties. It was found that the presence in the molecule of 2-aminopropyl fragment determines an efficient and selective inhibition of butyrylcholinesterase as compared to acetylcholinesterase and carboxylesterase, with radical-scavenging activity being weak. The compounds containing a 2-aminopropenyl fragment possess a high radicalscavenging activity, weakly inhibit cholinesterases, and exhibit anticarboxylesterase activity. A wide spectrum of activity of 3-substituted 5-anilino-1,2,4-thiadiazoles as inhibitors of cholinesterases and highly efficient scavengers of free radicals gives a basis for the optimization of structure and development in this series of original agents for therapy of neurodegenerative diseases. 相似文献