Method for phase boundary structure control of laminated materials; destruction process investigations of nanostructured coatings with predetermined phase boundary texture

New surface texturing method by means of microplasma coating deposition with the following etching of the coating was shown and described. The method of step by step microplasma texturing was proposed to control the phase boundary of laminated materials. Micrographs of nanostructured inorganic non-metallic coating surface were obtained and analyzed before and after mechanical deformation. The nature of cracks formation and growth was investigated

Long-term spectropolarimetric monitoring of the cool supergiant Betelgeuse

We report on a long-term monitoring of the cool supergiant Betelgeuse, using the NARVAL and ESPaDOnS high-resolution spectropolarimeters, respectively installed at Telescope Bernard Lyot (Pic du Midi Observatory, France) and at the Canada-France-Hawaii Telescope (Mauna Kea Observatory, Hawaii). The data set, constituted of circularly polarized (Stokes V) and intensity (Stokes I) spectra, was collected between 2010 and 2012. We investigate here the temporal evolution of magnetic field, convection and temperature at photospheric level, using simultaneous measurements of the longitudinal magnetic field component, the core emission of the Ca II infrared triplet, the line-depth ratio of selected photospheric lines and the radial velocity of the star.Comment: Proceedings of the Betelgeuse Workshop, Paris, 26-29 Nov 201

Demand analysis for competences in the field of information technologies from leading Russian companies

At the present stage of development of information technologies, the study of the need for qualified personnel is becoming more and more popular. At the same time, there is a problem of determining the compliance of specialists’ training level in the field of information technology with the requirements of employers. The article presents the results of a study of the demand for competencies in this field from leading Russian companies. The purpose of the study is to determine the generalized requirements for job seekers in the labor market and the formation of lists of key skills for each of the specialties (professional groups) in the field of information technology. An algorithmic solution is proposed for analyzing the demand for competencies and determining the most demanded skills for various areas. The proposed algorithm is implemented on the example of data on vacancies of the Yandex and VK Group companies, collected from open sources. Data collection was carried out by a modified method: the initial array was formed automatically using the ParseHub parser and corrected manually. The grouping of data was carried out according to the most demanded IT-specialties and according to the generalized formulations of the requirements for these specialties. The key skills of specialists in relevant IT-areas have been identified. The study uses a combination of theoretical and empirical methods. The above algorithm and the results of aggregating groups of vacancies for IT-specialists and their professional competencies demanded by employers can be used for a deeper analysis of demand in the labor market and taken into account when forming the competencies of students in information technology training programs

Dynamics of photogenerated charge carriers in TiO2 /MoO3, TiO2 /WO3 and TiO2 /V2O5 photocatalysts with mosaic structure

Titania is a widely used photocatalytic material possessing such advantages as low cost and high reactivity under the ultraviolet light illumination. However, the fast recombination of photoexcited charge carriers limits its application. Herein, we have synthesized original nanomaterials with mosaic structures that exhibited well-defined heterojunctions and new properties. Using SEM, XRD, EPR spectroscopy, photocatalytic measurements, and photoinduced pathphysiological activity of these photocatalysts, we studied the processes of charge carrier accumulation in TiO2 /MoO3, TiO2 /WO3, and TiO2 /V2 O5 under in situ UV illumination with emphasis on the charge exchange between energy levels of these nanosized semiconductors. It is shown that the accumulation of photoinduced charges occurs in two forms (i) filled electron traps corresponding to Ti4+ /Ti3+ levels and (ii) Mo5+ centers, both forms contributing to the photoinduced biocide activity of the samples. This work demonstrates that light exposure of heterostructure photocatalysts with mosaic surfaces produces different types of charge-trapping centers capable of interacting with molecular oxygen yielding peroxo species, which provide long-life light-induced ”self-cleaning” behavior. Such photoaccumulating materials open new opportunities in developing light-driven self-sterilization structures exhibiting a prolonged bactericidal effect up to 10 h after stopping light exposure. © 2020 by the authors. Licensee MDPI, Basel, Switzerland

A POSSIBILITY TO USE ANTIARRHYTHMIC MEDICATIONS FROM II CLASS AND MODULATED KINESITHERAPY AS PRIMARY PREVENTION OF ATRIAL FIBRILLATION IN METABOLIC SYNDROME PATIENTS

Aim. To evaluate the usage of II class antiarrhythmic drugs and modulated kinesitherapy (MK) as primary prevention of atrial fibrillation (AF) in patients with metabolic syndrome (MS) with revelation of short-term risk for this arrhythmia development.Material and methods. We observed 153 patients with MS at the age 58-75 y. o. without AF in anamnesis, but with short-term risk of its development (2 years after examination), defined via comparative analysis of AF course, induced by transesophageal electrocardiostimulation, in dynamic patients observation. All patients, as primary prevention of AF, used antiarrhythmics of the 2nd class, and in side effects development or in contraindications they underwent MK; polyunsaturated fatty acids also used (PUFA).Results. After inclusion to the study 77 (50,33%) of MS patients used II class drugs additionally to therapy, 42 (27,45%) patients underwent MK, and the rest used PUFA. The best clinical effect was found in II class drugs and MK >63,75% and 74,41%, resp. Efficacy of the therapy in this type of patients highly correlated with the improvement of the left ventricle dysfunction, signal-average electrocardiogram, P-wave dispersion and the decrease of the left atrium volume.Conclusion. If the short-term risk of AF found in MS patients, as primary prevention the method of choice is antiarrhythmic therapy II class drugs and MK

High-Q trenched aluminum coplanar resonators with an ultrasonic edge microcutting for superconducting quantum devices

Dielectric losses are one of the key factors limiting the coherence of superconducting qubits. The impact of materials and fabrication steps on dielectric losses can be evaluated using coplanar waveguide (CPW) microwave resonators. Here, we report on superconducting CPW microwave resonators with internal quality factors systematically exceeding 5x106 at high powers and 2x106 (with the best value of 4.4x106) at low power. Such performance is demonstrated for 100-nm-thick aluminum resonators with 7-10.5 um center trace on high-resistivity silicon substrates commonly used in quantum Josephson junction circuits. We investigate internal quality factors of the resonators with both dry and wet aluminum etching, as well as deep and isotropic reactive ion etching of silicon substrate. Josephson junction compatible CPW resonators fabrication process with both airbridges and silicon substrate etching is proposed. Finally, we demonstrate the effect of airbridges positions and extra process steps on the overall dielectric losses. The best quality fa ctors are obtained for the wet etched aluminum resonators and isotropically removed substrate with the proposed ultrasonic metal edge microcutting.Comment: 6 pages, 2 figure

Direct detection of a magnetic field in the photosphere of the single M giant EK Boo: How common is magnetic activity among M giants?

We study the fast rotating M5 giant EK Boo by means of spectropolarimetry to obtain direct and simultaneous measurements of both the magnetic field and activity indicators, in order to infer the origin of the activity in this fairly evolved giant. We used the new spectropolarimeter NARVAL at the Bernard Lyot Telescope (Observatoire du Pic du Midi, France) to obtain a series of Stokes I and Stokes V profiles for EK Boo. Using the Least Square Deconvolution technique we were able to detect the Zeeman signature of the magnetic field. We measured its longitudinal component by means of the averaged Stokes V and Stokes I profiles. The spectra also permitted us to monitor the CaII K&H chromospheric emission lines, which are well known as indicators of stellar magnetic activity. From ten observations obtained between April 2008 and March 2009, we deduce that EK Boo has a magnetic field, which varied in the range of -0.1 to -8 G. We also determined the initial mass and evolutionary stage of EK Boo, based on up-to-date stellar evolution tracks. The initial mass is in the range of 2.0-3.6 M_sun, and EK Boo is either on the asymptotic giant branch (AGB), at the onset of the thermal pulse phase, or at the tip of the first (or red) giant branch (RGB). The fast rotation and activity of EK Boo might be explained by angular momentum dredge-up from the interior, or by the merging of a binary. In addition, we observed eight other M giants, which are known as X-ray emitters, or to be rotating fast for their class. For one of these, beta And, presumably also an AGB star, we have a marginal detection of magnetic field, and a longitudinal component Bl of about 1G was measured. More observations like this will answer the question whether EK Boo is a special case, or whether magnetic activity is, rather, more common among M giants than expected.Comment: Accepted for publication in Astronomy & Astrophysics, 10 pages, 8 figure