55 research outputs found
Rare earth elements materials production from apatite ores
The paper deals with the study of processing apatite ores with nitric acid and extraction of the rare earth elements. The rare earth elements can be successfully separated and recovered by extraction from the nitrate- phosphate solution, being an tributyl phosphate as extraction agent. The developed scheme of the processing apatite concentrate provides obtaining rare earth concentrates with high qualitative characteristics
Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers
The multigap superconductivity modulated by quantum confinement effects in a
superlattice of quantum wells is presented. Our theoretical BCS approach
captures the low-energy physics of a shape resonance in the superconducting
gaps when the chemical potential is tuned near a Lifshitz transition. We focus
on the case of weak Cooper-pairing coupling channels and strong pair exchange
interaction driven by repulsive Coulomb interaction that allows to use the BCS
theory in the weak-coupling regime neglecting retardation effects like in
quantum condensates of ultracold gases. The calculated matrix element effects
in the pairing interaction are shown to yield a complex physics near the
particular quantum critical points due to Lifshitz transitions in multigap
superconductivity. Strong deviations of the ratio from the
standard BCS value as a function of the position of the chemical potential
relative to the Lifshitz transition point measured by the Lifshitz parameter
are found. The response of the condensate phase to the tuning of the Lifshitz
parameter is compared with the response of ultracold gases in the BCS-BEC
crossover tuned by an external magnetic field. The results provide the
description of the condensates in this regime where matrix element effects play
a key role.Comment: 12 pages, 6 figure
Extraction of rare earth elements from hydrate-phosphate precipitates of apatite processing
The features of extraction of rare earth elements (REE) were considered from hydrate-phosphate precipitates of REE of apatite processing by nitric acid technology. The preliminary purification of nitrate solution of REE from impurities of titanium, aluminum, iron, uranium and thorium was suggested to obtain stable solutions not forming precipitates. Washing the extract was recommended with the evaporated reextract that allows to obtain directly on the cascade of REE extraction the concentrated solutions suitable for the separation into groups by the extraction method. Technical decisions were suggested for the separation of REE in groups without the use of salting-out agent
ΠΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½ΡΠ΅ ΠΏΠ»ΠΎΡΠ°Π΄ΠΊΠΈ Π΄Π»Ρ ΠΏΡΠΎΡΠ΅ΡΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ Π½Π°ΡΠΊΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠΎΠΎΠ±ΡΠ΅ΡΡΠ²Π°: ΠΎΠ±Π·ΠΎΡ ΡΠ°Π±ΠΎΡΡ Π’ΡΠ΅ΡΡΠ΅ΠΉ Π½Π°ΡΡΠ½ΠΎΠΉ ΠΊΠΎΠ½ΡΠ΅ΡΠ΅Π½ΡΠΈΠΈ Β«ΠΠ°ΡΠΊΠΎΠΌΠ΅ΡΡΠΈΡ, Π±ΠΈΠ±Π»ΠΈΠΎΠΌΠ΅ΡΡΠΈΡ, ΠΎΡΠΊΡΡΡΡΠ΅ Π΄Π°Π½Π½ΡΠ΅ ΠΈ ΠΏΡΠ±Π»ΠΈΠΊΠ°ΡΠΈΠΈ Π² Π½Π°ΡΠΊΠ΅Β»
The authors review the papers delivered at the Third Scientific Conference βScientometrics, bibliometrics, open data and publications in scienceβ held within the framework of the Sixth World Professional Forum βThe Book. Culture. Education. Innovationsβ (βCrimeaβ2021β) (June 5β13, 2021, Republic of Crimea, Russian Federation). The Conference key topics discussed at its three sessions were: trends in sci-tech development, scientometric studies of scientific periodicals, as well as case studies and regional research through scientometric tools. The hot topics in Russian scientometrics are specified, including applied studies of bibliometric analysis for assessment of researchers, organizations, countries and journals, as well as of science migration streams, and theoretical development of new indicators of or search for scientometric frontiers. Within the practical part of the conference, The Basics of Bibliometrics crash course was offered to the participants. It comprised essential knowledge, competences and skills of work with science citation databases. The need for the more intensive exchange of knowledge within the Russian emerging scientometrics community to expand competences, to strengthen communication between those assessing and being assessed is substantiated. These would contribute not only scientometrics but the Russian science on the whole.ΠΠ±Π·ΠΎΡ Π΄ΠΎΠΊΠ»Π°Π΄ΠΎΠ², ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π½ΡΡ
Π½Π° Π’ΡΠ΅ΡΡΠ΅ΠΉ Π½Π°ΡΡΠ½ΠΎΠΉ ΠΊΠΎΠ½ΡΠ΅ΡΠ΅Π½ΡΠΈΠΈ Β«ΠΠ°ΡΠΊΠΎΠΌΠ΅ΡΡΠΈΡ, Π±ΠΈΠ±Π»ΠΈΠΎΠΌΠ΅ΡΡΠΈΡ, ΠΎΡΠΊΡΡΡΡΠ΅ Π΄Π°Π½Π½ΡΠ΅ ΠΈ ΠΏΡΠ±Π»ΠΈΠΊΠ°ΡΠΈΠΈ Π² Π½Π°ΡΠΊΠ΅Β», ΠΏΡΠΎΡΠ΅Π΄ΡΠ΅ΠΉ Π² ΡΠ°ΠΌΠΊΠ°Ρ
Π¨Π΅ΡΡΠΎΠ³ΠΎ ΠΌΠ΅ΠΆΠ΄ΡΠ½Π°ΡΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΌΠ° Β«ΠΠ½ΠΈΠ³Π°. ΠΡΠ»ΡΡΡΡΠ°. ΠΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅. ΠΠ½Π½ΠΎΠ²Π°ΡΠΈΠΈΒ» (Β«ΠΡΡΠΌβ2021Β») (5β13 ΠΈΡΠ½Ρ 2021 Π³., Π³. Π‘ΡΠ΄Π°ΠΊ, Π Π΅ΡΠΏΡΠ±Π»ΠΈΠΊΠ° ΠΡΡΠΌ, Π ΠΎΡΡΠΈΠΉΡΠΊΠ°Ρ Π€Π΅Π΄Π΅ΡΠ°ΡΠΈΡ). ΠΠ»ΡΡΠ΅Π²ΡΠ΅ ΡΠ΅ΠΌΠ°ΡΠΈΠΊΠΈ ΠΊΠΎΠ½ΡΠ΅ΡΠ΅Π½ΡΠΈΠΈ Π½Π° ΡΡΡΡ
Π·Π°ΡΠ΅Π΄Π°Π½ΠΈΡΡ
: ΡΡΠ΅Π½Π΄Ρ Π½Π°ΡΡΠ½ΠΎ-ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ°Π·Π²ΠΈΡΠΈΡ, Π½Π°ΡΠΊΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ, ΡΠ²ΡΠ·Π°Π½Π½ΡΠ΅ Ρ Π½Π°ΡΡΠ½ΠΎΠΉ ΠΏΠ΅ΡΠΈΠΎΠ΄ΠΈΠΊΠΎΠΉ, Π° ΡΠ°ΠΊΠΆΠ΅ ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈ ΡΠ΅Π³ΠΈΠΎΠ½Π°Π»ΡΠ½ΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ, Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π½ΡΠ΅ Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ Π½Π°ΡΠΊΠΎΠΌΠ΅ΡΡΠΈΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½Ρ Π°ΠΊΡΡΠ°Π»ΡΠ½ΡΠ΅ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π½Π°ΡΠΊΠΎΠΌΠ΅ΡΡΠΈΠΈ Π² Π ΠΎΡΡΠΈΠΈ, Π²ΠΊΠ»ΡΡΠ°Ρ ΠΊΠ°ΠΊ ΠΏΡΠΈΠΊΠ»Π°Π΄Π½ΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎ Π°Π½Π°Π»ΠΈΠ·Ρ Π±ΠΈΠ±Π»ΠΈΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠΎΠ² Π΄Π»Ρ ΠΎΡΠ΅Π½ΠΊΠΈ ΡΡΡΠ½ΡΡ
, ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΉ, ΡΡΡΠ°Π½ ΠΈΠ»ΠΈ ΠΆΡΡΠ½Π°Π»ΠΎΠ², ΠΎΡΠ΅Π½ΠΊΠΈ Π½Π°ΡΡΠ½ΡΡ
ΠΌΠΈΠ³ΡΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΠΎΡΠΎΠΊΠΎΠ², ΡΠ°ΠΊ ΠΈ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ Π½ΠΎΠ²ΡΡ
ΠΈΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠΎΠ² ΠΈΠ»ΠΈ ΠΏΠΎΠΈΡΠΊ Π³ΡΠ°Π½ΠΈΡ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ Π½Π°ΡΠΊΠΎΠΌΠ΅ΡΡΠΈΠΈ. ΠΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΡΠ°ΡΡΡ ΠΊΠΎΠ½ΡΠ΅ΡΠ΅Π½ΡΠΈΠΈ β ΡΠΊΡΠΏΡΠ΅ΡΡ-ΠΊΡΡΡ Β«ΠΡΠ½ΠΎΠ²Ρ Π±ΠΈΠ±Π»ΠΈΠΎΠΌΠ΅ΡΡΠΈΠΈΒ», ΡΠ΅Π»ΡΡ ΠΊΠΎΡΠΎΡΠΎΠ³ΠΎ ΡΠ²Π»ΡΠ»ΠΎΡΡ ΠΏΡΠ΅Π΄ΠΎΡΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΡΠ»ΡΡΠ°ΡΠ΅Π»ΡΠΌ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° Π·Π½Π°Π½ΠΈΠΉ, ΠΊΠΎΠΌΠΏΠ΅ΡΠ΅Π½ΡΠΈΠΉ ΠΈ ΡΠΌΠ΅Π½ΠΈΠΉ, Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΡΡ
Π΄Π»Ρ ΡΠ°Π±ΠΎΡΡ Ρ Π±Π°Π·Π°ΠΌΠΈ Π΄Π°Π½Π½ΡΡ
Π½Π°ΡΡΠ½ΠΎΠ³ΠΎ ΡΠΈΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ. ΠΠΎΠ΄ΡΡΡΠΊΠ½ΡΡΠ° Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡ Π±ΠΎΠ»Π΅Π΅ ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΎΠ±ΠΌΠ΅Π½Π° Π·Π½Π°Π½ΠΈΡΠΌΠΈ Π² ΡΠΎΡΠΌΠΈΡΡΡΡΠ΅ΠΌΡΡ ΡΠΎΡΡΠΈΠΉΡΠΊΠΎΠΌ Π½Π°ΡΠΊΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΡΠΎΠΎΠ±ΡΠ΅ΡΡΠ²Π΅, ΡΡΠΎ Π±ΡΠ΄Π΅Ρ ΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΠΎΠ²Π°ΡΡ ΡΠ°ΡΡΠΈΡΠ΅Π½ΠΈΡ ΠΊΠΎΠΌΠΏΠ΅ΡΠ΅Π½ΡΠΈΠΉ ΡΡΠ°ΡΡΠ½ΠΈΠΊΠΎΠ², Π½Π°Π»Π°ΠΆΠΈΠ²Π°Π½ΠΈΡ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΡΡ
Π½Π° ΡΠ΅ΠΊΡΡΠΈΠΉ ΠΌΠΎΠΌΠ΅Π½Ρ ΠΊΠΎΠΌΠΌΡΠ½ΠΈΠΊΠ°ΡΠΈΠΉ ΠΌΠ΅ΠΆΠ΄Ρ ΠΎΡΠ΅Π½ΠΈΠ²Π°ΡΡΠΈΠΌΠΈ ΠΈ ΠΎΡΠ΅Π½ΠΈΠ²Π°Π΅ΠΌΡΠΌΠΈ, ΡΡΠΎ Π² ΠΈΡΠΎΠ³Π΅ ΠΏΠΎΠΌΠΎΠΆΠ΅Ρ ΡΠ΅ΡΠΈΡΡ ΠΌΠ½ΠΎΠ³ΠΈΠ΅ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ Π½Π΅ ΡΠΎΠ»ΡΠΊΠΎ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π½Π°ΡΠΊΠΎΠΌΠ΅ΡΡΠΈΠΈ, Π½ΠΎ ΠΈ ΡΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ Π½Π°ΡΠΊΠΈ Π² ΡΠ΅Π»ΠΎΠΌ
Charge Density Wave and Spin Density Wave in Two-Orbital Model for Iron-Based Superconductors
Studies of Electrical and Thermal Conductivities of Sheared Multi-Walled Carbon Nanotube with Isotactic Polypropylene Polymer Composites
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