Violation of the equivalence principle from light scalar fields: from Dark Matter candidates to scalarized black holes

Tensor-scalar theory is a wide class of alternative theory of gravitation that can be motivated by higher dimensional theories, by models of dark matter or dark ernergy. In the general case, the scalar field will couple non-universally to matter producing a violation of the equivalence principle. In this communication, we review a microscopic model of scalar/matter coupling and its observable consequences in terms of universality of free fall, of frequencies comparison and of redshifts tests. We then focus on two models: (i) a model of ultralight scalar dark matter and (ii) a model of scalarized black hole in our Galactic Center. For both these models, we present constraints using recent measurements: atomic clocks comparisons, universality of free fall measurements, measurement of the relativistic redshift with the short period star S0-2 orbiting the supermassive black hole in our Galactic Center.Comment: 8 pages, 1 figure, contribution to the 2019 Gravitation session of the 54th Rencontres de Morion

Statistical analysis of tourism flows between Ukraine and the Baltic Sea Region countries in 2012-2019

This article explores the features and trends in inbound and outbound tourism flows between Ukraine and the Baltic Sea region (BSR) countries in 2012-2019. The research question is whether inbound our outbound tourism prevailed and how visa-free travel to the Schengen Area affected the number of Ukrainians travelling to the Baltic Sea Region. Two data sources were used in the study. These are the Travel and Tourism Competitiveness Index of the World Economic Forum and data from the State Border Guard Service of Ukraine on the number of foreign citizens visiting Ukraine and the number of Ukrainians travelling abroad. The study employs the statistical methods of structural shifts analysis, time series analysis, and graphical visualisation. The findings indicate that Ukrainian outbound tourism was growing steadily over the study period, whilst visa-free travel to the Schengen Area had no statistically significant impact on the number of outbound tourists from Ukraine to the BSR. Outbound tourism flow prevailed over inbound. The number of inbound tourists to Ukraine sharply declined after 2013 because of the socio-political situation in the country. The analysis reveals significant changes in inbound and outbound tourism flow structures. The COVID-19 pandemic is shown to be a critical factor influencing the current state and prospects of the tourism industry

Оutside the academic classes of physical education as a method of ensuring health-saving of students’of higher educational institutions

The question is academic work in students’ physical education in university as an effective method of solving problems health-saving is considered. On the basis of theoretical analysis and practical experience, is defined role of academic work in ensuring a high level of physical fitness of the future specialists, which significantly increases the importance of physical training as part of a healthy lifestyle of students’ of universityВ работе рассмотрен вопрос внеакадемической работы в физическом воспитании студентов вузов, как действенного метода решения задач здоровьесбережения студенческой молодежи. На основе теоретического анализа и практического опыта, определена роль внеакадемической работы в процессе обеспечения высокого уровня физической подготовленности будущих специалистов, что существенно повышает значимость физической культуры как составляющей здорового образа жизни студентов высших учебных заведени

Universalities in One-electron Properties of Limit Quasi-periodic Lattices

We investigate one-electron properties of one-dimensional self-similar structures called limit quasi-periodic lattices. The trace map of such a lattice is nonconservative in contrast to the quasi-periodic case, and we can determine the structure of its attractor. It allows us to obtain the three new features of the present system: 1) The multi-fractal characters of the energy spectra are {\it universal}. 2) The supports of the $f(\alpha)$-spectra extend over the whole unit interval, $[0, 1]$. 3) There exist marginal critical states.Comment: 4 pages, 2figure

Dual-frequency cesium spin maser

Comagnetometers have been validated as valuable components of the atomic physics toolbox in fundamental and applied physics. So far, the explorations have been focused on systems involving nuclear spins. Presented here is a demonstration of an active alkali-metal (electronic) system, i.e., a dual-frequency spin maser operating with the collective cesium F=3 and F=4 spins. The experiments have been conducted in both magnetically shielded and unshielded environments. In addition to the discussion of the system's positive-feedback mechanism, the implementation of the dual-frequency spin maser for industrial nondestructive testing is shown. The stability of the F=3 and F=4 spin precession frequency ratio measurement is limited at the 3×10-8 level by the laser frequency drift, corresponding to a frequency stability of 1.2mHz for 104 s integration time. We discuss measurement strategies that could improve this stability to nHz, enabling measurements with sensitivities to the axion-nucleon and axion-electron interactions at the levels of fa/CN∼109 and fa/Ce∼108 GeV, respectively

Formation of a stable deacagonal quasicrystalline Al-Pd-Mn surface layer

We report the in situ formation of an ordered equilibrium decagonal Al-Pd-Mn quasicrystal overlayer on the 5-fold symmetric surface of an icosahedral Al-Pd-Mn monograin. The decagonal structure of the epilayer is evidenced by x-ray photoelectron diffraction, low-energy electron diffraction and electron backscatter diffraction. This overlayer is also characterized by a reduced density of states near the Fermi edge as expected for quasicrystals. This is the first time that a millimeter-size surface of the stable decagonal Al-Pd-Mn is obtained, studied and compared to its icosahedral counterpart.Comment: Submitted to Phys. Ref. Lett. (18 July 2001

Medical workers of health care institutions as a risk group for chemo-resistant tuberculosis: analysis of incidence, a clinical case.

The purpose of our study was to analyze the prevalence of morbidity of medical workers of health care institutions and anti-tuberculosis institutions, as well as the analysis of resistance of mycobacterium tuberculosis strains among medical personal of health facilities in the Dnipropetrovsk region. Retrospective analysis for 2015 - 2017 of electronic database of the patients register (TB-manager), outpatient cards and case histories of patients which underwent treatment in pulmonary-tuberculosis and surgical departments of CI «DnepropetrovskRegional Clinical Treatment and Prophylactic Association "Phthisiology"» DRC» was conducted . The incidence of tuberculosis among medical workers in health care institutions of Ukraine remains at a fairly high, stable level (426 cases of tuberculosis in 2016, 389 cases in 2017) on the background of the decrease in the incidence among the general population (59.5 people per 100 thousand population in 2014 and 51.9 per 100 thousand population in 2017 ). In Ukraine among tuberculosis patients – medical workers,  the overwhelming majority are workers of establishments of the general medical network (GMN) - 351 people, while in anti-tuberculosis institutions (ATI) in 2017, 38 cases of tuberculosis were registered. The article presents the clinical case of multidrug-resistant tuberculosis (MDR) in staff member of the pathoanatomical bureau, one of the medical institutions of the city Dnipro

Medical workers of health care institutions as a risk group for chemo-resistant tuberculosis: analysis of incidence, a clinical case.

The purpose of our study was to analyze the prevalence of morbidity of medical workers of health care institutions and anti-tuberculosis institutions, as well as the analysis of resistance of mycobacterium tuberculosis strains among medical personal of health facilities in the Dnipropetrovsk region. Retrospective analysis for 2015 - 2017 of electronic database of the patients register (TB-manager), outpatient cards and case histories of patients which underwent treatment in pulmonary-tuberculosis and surgical departments of CI «DnepropetrovskRegional Clinical Treatment and Prophylactic Association "Phthisiology"» DRC» was conducted . The incidence of tuberculosis among medical workers in health care institutions of Ukraine remains at a fairly high, stable level (426 cases of tuberculosis in 2016, 389 cases in 2017) on the background of the decrease in the incidence among the general population (59.5 people per 100 thousand population in 2014 and 51.9 per 100 thousand population in 2017 ). In Ukraine among tuberculosis patients – medical workers,  the overwhelming majority are workers of establishments of the general medical network (GMN) - 351 people, while in anti-tuberculosis institutions (ATI) in 2017, 38 cases of tuberculosis were registered. The article presents the clinical case of multidrug-resistant tuberculosis (MDR) in staff member of the pathoanatomical bureau, one of the medical institutions of the city Dnipro