PUBLIC HEALTH AND BIOPOLITICS STRATEGY UNDER THE COVID-19 PANDEMIC

The purpose of the presented study is the complex analysis of competence and sufficiency of public safety measures implemented by the authorities in the early stages of the coronavirus pandemic. The article reveals the need for governmental involvement in solving the issues of essential services and maintaining public healthcare. The article also integrated the results of studies of governmental approaches to the development of compensatory policies in different countries while considering the population as a specific object of national biopolitics. A comparative description of examples of national biopolitics as a reaction to the development of an epidemiological threat (cholera, smallpox, Ebola, coronavirus) is presented. A comprehensive strategic approach to developing state biopolitics is recommended, which includes a system of necessary measures, analyzes factors and threats affecting the mechanism of biological security, and summarizes international experience in preventing the spread of dangerous infectious diseases. The conclusion is drawn about the necessity of phased implementation of a complex of proactive preventive measures capable of ensuring the protection of the interests of all participants in the process of socio-economic development of society and the state

Bending of electromagnetic waves in all-dielectric particle array waveguides

We propose and demonstrate experimentally an alternative approach for realizing subwavelength photonic structures, exploiting the waveguiding properties of chains of high-index dielectric disks with both electric and magnetic dipole resonances. We reveal that the electromagnetic energy can be efficiently guided through sharp corners by means of the mode polarization conversion at waveguide bends. We confirm experimentally the guidance through a 90° bend in the microwave frequency range.This work was supported by the Ministry of Education and Science of the Russian Federation (Project 11.G34.31.0020, GOSZADANIE 2014/190, Zadanie No. 3.561.2014/K, 14.584.21.0009 10), by Russian Foundation for Basic Research, the Dynasty Foundation (Russia), the Australian Research Council via Future Fellowship Program (No. FT110100037), and the Australian National University

Study of the characteristics of organic mining materials affecting their explosive properties

The article analyzes the explosive and fire-hazardous properties of coal dust of various dispersions using the example of coal mine dust. The authors proposed sample preparation methods for obtaining and studying dust fractions with a dispersity of less than 800 microns. The results of a study of the shapes of dust particles are presented. To study the characteristic particle sizes the authors suggested using the optical microscopy method implemented using a LEICA DM 4000 microscope and the “Image Scope Color” information processing application. To assess the reactivity of dust particles, the authors used a simultaneous thermal analysis method implemented using an STA 449 F1 Jupiter with NETZSCH Proteus Software. The results of a thermogravimetric study of narrow fractions of organic coal dust are presented. The influence of dispersion on the explosive properties of dusts has been established. The results obtained showed the need and expediency of further study of precisely fine fractions of explosive dusts of this kind

Estimation of parameters for endogenous hotspot emergence during coal cargo transportation by bulk carriers

The article briefly describes the fire and explosion properties of coal raw materials (hard coal of different grades). The relevance of the problem is shown on the example of incidents occurring during transportation of coal raw materials by different modes of transport. The issues of bulk coal transportation are considered in more detail. The paper aims at determining kinetic parameters of low-temperature oxidation processes leading to self-heating and/or spontaneous combustion of coal, and at determining optimal forms of combustion. On the basis of the data obtained, it is suggested to use bulk cargo holds with strictly defined geometric characteristics. The methodological approach of Prof. J.S. Kiselev and the method of synchronous thermal analysis were chosen as the main method of research. The method proposed by J.S. Kiselev is based on the application of a dry-air thermostat. It permits the study of dependence of the occurrence of spontaneous combustion processes in the coal mass on the thermal-physical parameters and the ambient parameters by obtaining the curves of the heating and cooling rates. The method of synchronous thermal analysis applied by the authors made it possible to prove the need for more careful control of fine coal fractions. Thus, the authors have established the dependence of the rate of oxidative thermochemical processes of pyrolysis on the fractional composition of the sample by applying a highly scientific method. As a result of experimental studies, the authors have calculated the main kinetic parameters of autoignition, namely, activation energy and preexponential multiplier. They suggested geometric characteristics of the shape of the coal accumulation and the bulkhead hold that would minimise the probability of spontaneous combustion within coal accumulation

Implementation of a risk-based OHS management system at IMC mining company

IMC mining company produces gold and silver. In mining operations that are carried out every day in the workplace, there must be dangers and risks. All these hazards are more related to the transport systems and transport used in the mining process. International mining company (IMC) underground mines definitely have operations division jobs with a high level of risk against work accidents, for example, maintenance of transport installations and the systems. Therefore, it is important to identify hazards, risk assessments, and determine the type of risk control in the section where work accidents are found. Hazard Identification and Risk Assessment Determining Control is a prevention program against fatal incidents. Risk Management at IMC is based on the Hazard Identification and Risk Assessment Determining Control (HIRADC) methodology which focuses on managing mining safety risks. This article aims to find out what the potential hazards and risks are contained in the work of the engineering and transport of underground mining division as well as provide preventive measures to reduce these risks

Resonant transmission of light in chains of high-index dielectric particles

We study numerically, analytically, and experimentally the resonant transmission of light in a waveguide formed by a periodic array of high-index dielectric nanoparticles with a side-coupled resonator. We demonstrate that a resonator with high enough Q-factor provides the conditions for the Fano-type interference allowing one to control the resonant transmission of light. We suggest a practical realization of this resonant effect based on the quadrupole resonance of a dielectric particle and demonstrate it experimentally for ceramic disks at microwave frequencies

Postfilament supercontinuum on 100 m path in air

International audiencePulses at 744 nm with 90 fs duration, 6 mJ energy, and a weakly divergent wavefront propagate for more than 100 m and generate a filament followed by an unprecedently long high intensity (≥1TW/cm2) light channel. Over a 20 m long sub-section of this channel, the pulse energy is transferred continuously to the infrared wing, forming spectral humps that extend up to 850 nm. From 3D+time carrier-resolved simulations of 100 m pulse propagation, we show that spectral humps indicate the formation of a train of femtosecond pulses appearing at a predictable position in the propagation path