The resonance phenomenon in the reaction–diffusion systems

A new mechanism of pattern formation different from the Turing and oscillatory instabilities in the reaction–diffusion systems was found. It is closely connected with the resonance phenomenon that appears in the models when Jacobi's matrix of the kinetic part is equivalent to Jordan cell and diffusion coefficients are cited. Some results of numerical calculations of the blood coagulation model are discussed. The pattern formation regimes that can be treated as the results from the resonance phenomenon were observed

Smart contract as a tool for digital transformation of penitentiary system economy

The Russian penitentiary system is a large diversified industry with a total annual output of goods, works and services worth more than 30 billion rubles. The process of integrating such a manufacturer into the national digital economic system requires a special set of tools, one of which, in the author’s opinion, is a smart contract. The object of the study is the sphere of labor adaptation of convicts, subject is digital tools to improve efficiency of production processes and relations in the penitentiary system. The article studies the use of smart contracts as one of the promising directions for improving economic activity of correctional institutions and optimizing the contracting system. As a result of the study, the author concluded that it is advisable to develop smart contracts as a tool to strengthen and develop economic potential of the penitentiary system, and also suggested possible directions of its practical application

Secondary Electron Spectral Changes of Irradiated Gold Nanoparticle Caused By PEGylation

Gold nanoparticles attract attention for the use in radiation therapy of tumors due to the ability to enhance the efficacy of ionizing radiation. The magnitude of the radiosensitizing effect depends on the parameters of the nanoparticle, in particular on the modification of the surface. In the present work, the spectrum of secondary particles generated in a gold nanoparticle virtually irradiated with 60Со gamma rays as a result of surface modification by a polyethylene glycol shell was studied. The Mont eCarlo calculations revealed that modification of the nanoparticle’s surface changes the spectrum of secondary particles. The most robust was the loss in low-energy electrons (51%) whereas the yield of Compton electrons increased by 1.27 times. At the same time, no statistically significant changes were observed in the spectrum of secondary photons and photoelectrons. Simulation of the formation and distribution of secondary electron radiation makes it possible to evaluate the parameters important for the rational design of antitumor nanoradiosensitizers based on chemical elements with a high atomic number. Keywords: gold nanoparticles, radiosensitizers, Monte-Carlo simulation, Geant4, radiation therapy, malignant tumors

Диагностические ошибки в пульмонологии

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Magnetoresistance of p-GaAs/AlGaAs structures in the vicinity of metal-insulator transition: Effect of superconducting leads

Experimental and theoretical studies on transport in semiconductor samples with superconducting electrodes are reported. We focus on the samples close to metal-insulator transition. In metallic samples, a peak of negative magnetoresistance at fields lower than critical magnetic field of the leads was observed. This peak is attributed to restoration of a single-particle tunneling emerging with suppression of superconductivity. The experimental results allow us to estimate tunneling transparency of the boundary between superconductor and metal. In contrast, for the insulating samples no such a peak was observed. We explain this behavior as related to properties of transport through the contact between superconductor and hopping conductor. This effect can be used to discriminate between weak localization and strong localization regimes.Comment: 10 pages, 3 fi

Kharkiv incoherent scatter facility

The structure, parameters and operating modes of the incoherent scatter radar of the Institute of Ionosphere, Kharkiv are presented. Some results of the ionosphere research obtained by this facility are shown.Наведено структуру, параметри і режими роботи радара некогерентного розсіяння Інституту іоносфери (м. Харків). Показано деякі результати спостережень іоносфери за допомогою цього обладнання

Impact of employment and unemployment levels on tuberculosis incidence and mortality rate in population

Introduction. The organization of countering the spread of tuberculosis, as a socially determined disease, remains relevant. Purpose. Assess the relationship between unemployment and employment rates with tuberculosis morbidity and mortality in Russia. Materials and methods. The analysis of the correlations of time series of values of tuberculosis morbidity and mortality rates, unemployment and employment rates of the population in the context of 85 constituent entities of Russia in the period of 2014–2020 years was carried out using the correlation coefficient with subsequent assessment of its reliability. Results and discussion. A reliable correlation was established between the studied socio‑economic factors and main indicators characterizing tuberculosis epidemic situation. Similar results have been obtained in a number of other studies.Введение. Организация противодействия распространению туберкулеза как социально обоснованного заболевания сохраняет свою актуальность. Цель исследования — оценить взаимосвязь уровней безработицы и занятости населения с заболеваемостью и смертностью от туберкулеза на территории России. Материалы и методы. Проведен анализ взаимосвязей динамических рядов значений показателей заболеваемости и смертности от туберкулеза, уровней безработицы и занятости населения в разрезе 85 субъектов России в период 2014–2020 гг. с применением коэффициента корреляции с последующей оценкой его достоверности. Результаты и обсуждение. Установлена достоверная корреляционная взаимосвязь между изучаемыми социально‑экономическими факторами и основными показателями, характеризующими эпидемическую ситуацию по туберкулезу. Аналогичные результаты получены в ряде других исследований