The ways to improve the energy conversion efficiency in erbium-doped Gd 2 O 3 nanoparticles

The basic requirements for the crystal lattice and defectiveness of Gd 2 O 3 matrix as well as for the concentration of Er 3+ dopants to achieve the enhanced parameters of energy conversion in Gd 2 O 3 :Er nanoparticles are summarized. The obtained data allow to optimize and improve the functional characteristics of Gd 2 O 3 :Er-based down-conversion layers applying in solar cells. © 2018 Institute of Physics Publishing. All rights reserved.The work has been funded by the Ministry of Education and Science of the Russian Federation (Government task №3.1485.2017/4.6)

PHOTOLUMINESCENCE OF OXYGEN-DEFICIENT CENTERS IN THE SILICA GLASS IMPLANTED BY RHENIUM IONS

The luminescence of silica glass implanted by rhenium ions studied. Two types of oxygen-deficient centers were found: ODC(I), ODC(II). It has been established that the implantation by rhenium ions causes to long-wavelength offset the singlet-singlet luminescence bands. The bands energy of triplet-singlet luminescence varies insignificantly

PARAMETERS OF CHARACTERISTIC RAMAN LINES IN THE LINEAR-CHAINED CARBON FILMS

In the present work, experimental Raman spectra of linear-chain carbon (LСС) films of different thickness were studied. The dependence of the Raman shift frequency and its width at half the height on the thickness of the linear-chained carbon film was established. According to the results obtained, hypotheses were put forward about the cause of the appearance of spectral shifts

OPTICAL PROPERTIES OF SOLID SOLUTIONS Gd2O3-Y2O3

In this paper, the role of the quantitative composition of solid solutions of Gd2O3-Y2O3 in the formation of the luminescent properties of Gd3+ ions was investigated by optical spec-troscopy. The main goal was to study the luminescence behavior of Gd2O3-Y2O3 under various types of excitation. Samples of Gd2O3-Y2O3 nanoparticles with different compositions were obtained by chemical precipitation from hydroalcoholic solutions

Assessment of Seroprevalence to SARS-CoV-2 in Various Population Cohorts Using Logit Regression Models During Initial Period of Herd Immunity Formation

The aim of the study was to assess the dynamics of seroprevalence to SARS-CoV-2 in various population groups during the initial period of herd immunity formation based on multivariate analysis using logit regression models.Materials and methods. The study involved 1561 individuals divided into three population cohorts: people living with HIV/AIDS (PLHA), healthy blood donors, medical workers. The presence of antibodies to SARS-CoV-2 was determined in blood serum through ELISA using commercial reagent kits. Multivariate analysis of the dynamics of seroprevalence to SARS-CoV-2 was carried out using logistic regression models.Results and discussion. It has been revealed that probability of detecting IgG antibodies to SARS-CoV-2 significantly increased among the donors and medical workers in the spring-autumn 2020 series (p=0.005 и p<0.001, respectively), which corresponds to seroprevalence shift in the general population. Groups of donors and medical workers can be considered as indicator groups that characterize the herd immunity in reference to SARS-CoV-2, as well as the intensity of COVID-19 epidemic process. Seroprevalence to SARS-CoV-2 in PLHA group was at a consistently high level throughout the observation period. The generated logistic regression models made it possible to determine the trends in the development of the epidemic situation based on multifactorial analysis of the dynamics of seroprevalence to SARS-CoV-2

XPS-CHARACTERIZATION OF THIN-FILM CARBON COMPOSITES WITH VARIABLE HYBRIDIZATION

The purpose of this paper is to obtain data on the elemental and chemical composition of a surface layer several tens of atomic monolayers thick. The essence of the technique is to record and analyze the spectrum of secondary electrons excited by an X-ray beam. A high resolution in the energy of the detected electrons makes it possible to determine even tiny shifts in the peaks due to a change in the chemical state of the atoms, which makes it possible to study thin surface layers. As a system of samples, we used films of 20 - 400 nm long carbon chains on copper and silicon substrates synthesized by ion condensation in high vacuum, where alignment of the beams of carbon and argon ions facilitates the growth of a film of hexagonally packed sp1 chains

THE BASIC AGENTS OF PYOINFLAMMATORY COMPLICATIONS IN PATIENTS WITH KIDNEY DISEASE FROM THE DEPARTMENT OF RESUSCITATION AND INTENSIVE THERAPY REGIONAL CLINICAL HOSPITAL № 1

Is carried out the analysis of the frequency of the development of different agents of pyoinflammatory complications in patients with the nefrologicheskimi diseases from the department of anasteziologo – resuscitation of Regional Clinical Hospital № 1 within the period s 2013 on 2015 the yr. In the time of a study it was identified 902 the culture of the agents more than 30 species. Among them gram-negative bacteria composed 42,1 %, gram-positive – 38,8 % and 19,1 % from all agents there were yeasts of the genus Candida. More frequent than others were separated the enterococcuses: 171 strains of Enterococcus faecalis, 150 of strains E. faecium and 148 cultures Klebsiella pneumoniae