Psychoemotional state and bioelectrical brain activity in patients of different ages with metabolic syndrome after COVID-19

The aim of this study was to find out the impact of COVID-19 infection on the psycho-emotional state and bioelectrical brain activity in persons of different ages with metabolic syndrome. Material and methods. We examined 53 people who were divided into groups depending on age (40–59 years and 60 years and older) and status with regard to COVID-19 infection (contracted, not contracted). Patients had metabolic syndrome (ATP III), underwent comprehensive clinical and laboratory examinations, electroencephalography (an 18-channel electroencephalograph Nihon Kohden, Japan) and answered the Hospital Anxiety and Depression Scale (HADS) questionnaire. Results. Symptoms of anxiety or depression after COVID-19 were found in both age groups of MS. Anxiety symptoms were more often found in the group of 60 years and older. At the same time, subclinical anxiety was noted in persons of 60 years and older, while clinical anxiety – in middle-aged individuals. The latter also showed a trend towards an increase in clinically evident depression after COVID-19. Persons after COVID-19 with symptoms of anxiety or depression (according to the HADS scale) demonstrated changes in the frequency-amplitude indicators of the electroencephalogram (EEG) characterized by a power increase in the range of theta rhythm and accompanied by subclinical and clinical manifestations of depression. About 80 % of people who did not suffer from COVID-19 had normal EEG since 9 Hz alpha rhythm power was registered. In patients after COVID-19, there was a redistribution of alpha-rhythm power range: an increase in the ranges of alpha-1 rhythm and decrease in alpha-2 rhythm power as well as an increase in the delta and theta rhythm power range. Conclusions. 1–3 months following the acute period of COVID-19, the frequency of depression is 3 times higher in middle-aged patients with metabolic syndrome. In elderly patients with metabolic syndrome after COVID-19, anxiety is predominantly diagnosed – almost in every second. These manifestations of anxiety and depression are accompanied by disorganization of the bioelectrical brain activity

КОНЦЕПЦІЯ ВДОСКОНАЛЕННЯ КОНСТРУКЦІЇ КОЛІЇ

In article the basic directions of perfection of a design of a railway in modern conditions of operation are recommended.В статье рекомендованы основные направления совершенствования конструкции железнодорожного пути в современных условиях эксплуатации.У статті рекомендовані основні напрямки удосконалення конструкції залізничної колії в сучасних умовах експлуатаці

ОЦІНКА ПОТЕР ЕЛЕКТРОЕНЕРГІЇ В ТЯГОВІЙ МЕРЕЖІ МАГІСТРАЛЬНИХ ЗАЛІЗНИЦЬ

An indirect method of electric power losses determination in catenary has been examined. An example of solving such task with the help of specialized imitation model has been given and results of statistic analysis have been presented. Possible ways of using the obtained results have been exemplified.Рассмотрен косвенный метод определения потерь электроэнергии в тяговой сети. Приведен пример решения такой задачи с помощью специализированной имитационной модели и результаты статистического анализа полученных результатов. Показано возможное применение достигнутых результатов.Розглянуто непрямий метод визначення втрат електроенергії в тяговій мережі. Наведено приклад розв’язання такої задачі за допомогою спеціалізованої імітаційної моделі та результати статистичного аналізу отриманих результатів. Показане можливе застосування досягнутих результатів

Synthesis Pressure–Temperature Effect on Pinning in MgB2-Based Superconductors

International audienceThe volume pinning force, F p(max), increases with increasing synthesis or sintering pressure (0.1 MPa–2 GPa) in materials prepared at high temperature (1050 °C) while it stays practically unchanged in those prepared at low temperature (800 °C). The position of F p(max) can be shifted to higher magnetic fields by: (1) increasing the manufacturing pressure or decreasing the temperature (2) additions (Ti, SiC, or C, for example), and (3) in-situ preparation. Grain boundary pinning (GBP) dominates in materials prepared at low temperatures (600–800 °C), while high-temperature preparation induces strong point pinning (PP) or mixed pinning (MP) leading to outstanding properties. In materials produced by spark plasma sintering (SPS), the position of F p(max) is higher than expected for both grain boundary and point pinning. The distribution of boron and oxygen in MgB2 based material, which can changed by additions or the preparation conditions, significantly affects the type and strength of pining.Materials prepared under a pressure of 2 GPa with a nominal composition of Mg:7B or Mg:12B consist of 88.5 wt % MgB12, 2.5 wt % MgB2, 9 wt % MgO or 53 wt % MgB12, 31 wt % MgB20 16 wt % MgO, respectively. Their magnetic shielding fractions at low temperatures are 10 % and 1.5 %, with a transition temperature, T c of 37.4–37.6 K. Although their magnetic critical current density at zero field and 20 K was 2–5×102 A/cm2, they were found to be insulating on the macroscopic level

Synthesis Pressure–Temperature Effect on Pinning in MgB2-Based Superconductors

International audienc