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 $2\Delta/T_c$ 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

Информационные площадки для профессионального наукометрического сообщества: обзор работы Третьей научной конференции «Наукометрия, библиометрия, открытые данные и публикации в науке»

The authors review the papers delivered at the Third Scientific Conference “Scientometrics, bibliometrics, open data and publications in science” held within the framework of the Sixth World Professional Forum “The Book. Culture. Education. Innovations” (“Crimea–2021”) (June 5–13, 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.Обзор докладов, представленных на Третьей научной конференции «Наукометрия, библиометрия, открытые данные и публикации в науке», прошедшей в рамках Шестого международного профессионального форума «Книга. Культура. Образование. Инновации» («Крым–2021») (5–13 июня 2021 г., г. Судак, Республика Крым, Российская Федерация). Ключевые тематики конференции на трёх заседаниях: тренды научно-технологического развития, наукометрические исследования, связанные с научной периодикой, а также тематические и региональные исследования, выполненные с применением наукометрии. Показаны актуальные направления современной наукометрии в России, включая как прикладные исследования по анализу библиометрических индикаторов для оценки учёных, организаций, стран или журналов, оценки научных миграционных потоков, так и теоретические разработки новых индикаторов или поиск границ применения наукометрии. Практическая часть конференции – экспресс-курс «Основы библиометрии», целью которого являлось предоставление слушателям комплекса знаний, компетенций и умений, необходимых для работы с базами данных научного цитирования. Подчёркнута необходимость более интенсивного обмена знаниями в формирующемся российском наукометрическом сообществе, что будет способствовать расширению компетенций участников, налаживанию недостаточных на текущий момент коммуникаций между оценивающими и оцениваемыми, что в итоге поможет решить многие проблемы не только современной наукометрии, но и российской науки в целом