Pressure and temperature driven phase transitions in HgTe quantum wells

We present theoretical investigations of pressure and temperature driven phase transitions in HgTe quantum wells grown on CdTe buffer. Using the 8-band \textbf{k$\cdot$p} Hamiltonian we calculate evolution of energy band structure at different quantum well width with hydrostatic pressure up to 20 kBar and temperature ranging up 300 K. In particular, we show that in addition to temperature, tuning of hydrostatic pressure allows to drive transitions between semimetal, band insulator and topological insulator phases. Our realistic band structure calculations reveal that the band inversion under hydrostatic pressure and temperature may be accompanied by non-local overlapping between conduction and valence bands. The pressure and temperature phase diagrams are presented.Comment: 9 pages, 8 figures + Supplemental material (5 pages

Novel Enzymatic Synthesis of 3-hydroxybutyric Acid Oligomerswith Inserted Lactobionic Acid Moieties

3-Hydroxybutyric acid and lactobionic acid yielded linear and cyclic oligomers in a lipase-catalyzedcondensation polymerization reaction, performed at 80°C in bulk and organic solvent systems. Novozyme435 was the most efficient biocatalyst, and a mixture of t-butanol and dimethylsulfoxide in 80:20 (v/v) ratioprovided the highest copolymer conversions. The highest degree of polymerization reached 7 in case ofcopolymers with inserted lactobionic acid moiety and 11 for the 3-hydroxybutyric acid homopolymer by-product

Temperature-driven single-valley Dirac fermions in HgTe quantum wells

We report on temperature-dependent magnetospectroscopy of two HgTe/CdHgTe quantum wells below and above the critical well thickness $d_c$. Our results, obtained in magnetic fields up to 16 T and temperature range from 2 K to 150 K, clearly indicate a change of the band-gap energy with temperature. The quantum well wider than $d_c$ evidences a temperature-driven transition from topological insulator to semiconductor phases. At the critical temperature of 90 K, the merging of inter- and intra-band transitions in weak magnetic fields clearly specifies the formation of gapless state, revealing the appearance of single-valley massless Dirac fermions with velocity of $5.6\times10^5$ m$\times$s$^{-1}$. For both quantum wells, the energies extracted from experimental data are in good agreement with calculations on the basis of the 8-band Kane Hamiltonian with temperature-dependent parameters.Comment: 5 pages, 3 figures and Supplemental Materials (4 pages

THE STUDY OF ANTHROPONYMIC VOCABULARY IN THE RUSSIAN AS A FOREIGN LANGUAGE COURSE

В статье рассматривается лингвокультурологический подход, реализуемый при изучении студентами-инофонами антропонимов как культурно окрашенных языковых единиц, являющихся продуктом кумулятивной функции языка. Приведены примеры заданий, способствующих усвоению иностранными студентами представлений о национально-культурных особенностях ономастикона народа – носителя языка, а также формированию умений использования в речи имён как этикетных знаков.=the article views linguistic and cultural approach, applied in the study of anthroponyms as culturally marked language units, which are the product of the cumulative function of the language, by students-foreign speakers. The author of the article gives sample tasks, which contribute to foreign students’ understanding the idea of national and cultural peculiarities of the onomasticon of native speaking people, and also their skills of using names as etiquette signs in speech

THE STUDY OF ANTHROPONYMIC VOCABULARY IN THE RUSSIAN AS A FOREIGN LANGUAGE COURSE

В статье рассматривается лингвокультурологический подход, реализуемый при изучении студентами-инофонами антропонимов как культурно окрашенных языковых единиц, являющихся продуктом кумулятивной функции языка. Приведены примеры заданий, способствующих усвоению иностранными студентами представлений о национально-культурных особенностях ономастикона народа – носителя языка, а также формированию умений использования в речи имён как этикетных знаков.=the article views linguistic and cultural approach, applied in the study of anthroponyms as culturally marked language units, which are the product of the cumulative function of the language, by students-foreign speakers. The author of the article gives sample tasks, which contribute to foreign students’ understanding the idea of national and cultural peculiarities of the onomasticon of native speaking people, and also their skills of using names as etiquette signs in speech

Analysis and optimization of photonics devices manufacturing technologies based on carbon nanotubes

The analysis and optimization of optical devices manufacturing technologies based on carbon nanotubes intended for work in the terahertz range were carried out. These processes studied in the work have practical application for the deposition of carbon nanotubes and their subsequent use as materials for prototypes of the waveguide and sensor of the terahertz range. To obtain a layer of carbon nanotubes, a chemical vapor deposition chamber was used. Various aspects of the synthesis and growth of the mechanism of CNT are considered in this article. Carbon nanotubes (CNTs) were grown on a sandwich structure based on a silicon wafer, where a layer of aluminum and copper 100 nm thick was deposited, then an iron catalyst was applied about 5 nm thick, and then copper and aluminum were deposited again, but with a thickness of 10 nm layer is also using magnetron sputtering. The growth was carried out with two variable parameters: flow rate and flow duration

Mutational analysis for Wilson's disease

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