Electrophoretic Effects for Environmental Safety Technologies: Evacuation of Micro-Particle Conglomerations from the Surfaces

The actuality of the problem of contamination of objects by macro-molecular compounds is a growing problem today (especially given the terrible consequences of the pandemic). In fact, macromolecular complexes are mostly located on the surface layers of the surface covered with fine dust. Therefore, the development of technology for the removal of macromolecular components is actually a problem of fine (so we will call it) dust removal. This problem cannot be effectively solved by traditional mechanical removal methods alone, as contaminated objects have a rather complex, not even Euclidian, surface morphology. Therefore, it is important to develop effective technologies based on the use of properties of special configurations of external inhomogeneous electric field and removable components by means of a specially configured inhomogeneous electric field. The paper analyzes modern technologies of fine dust cleaning both mechanically and with the help of external electrical fields under the particular conditions and creation of levitation and electrophoretic motion. It has been found exact solutions of the model, which indicate in favor of the theoretical validity of decontamination technology using electric field with manipulative properties;the conditions of the most effective use of levitation-electrophoretic technology in the tasks of dust cleaning and decontamination, including decontamination of the surface-distributed macromolecular contaminants such as coronaviruses. © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/)

Change of Time Variations in Acoustic Vibrations in the Atmospheric Surface Layer in Moscow During Production Restrictions Due to Covid-19 Quarantine Measures in 2020

The presented research provides a comparative analysis of the features of the amplitude and spectral characteristics of acoustic noise in the conditions of Moscow during the quarantine period for COVID-19 in 2020 and during the period preceding the quarantine. As the initial data, we used the time series of instrumental observations of micropulsations of atmospheric pressure, carried out at the Center for Geophysical Monitoring in Moscow of Sadovsky Institute of Geosphere Dynamics of Russian Academy of Sciences from February to May 2020. Data plots were analyzed during periods characterized by calm meteorological conditions: the absence of strong atmospheric disturbances in the form of hurricanes and squalls, as well as atmospheric fronts. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

Acoustic Noise in Moscow during the Covid-19 Quarantine Period in 2020

This paper addresses the results of instrumental observation of acoustic oscillations in the atmosphere above the city of Moscow during the COVID-19 quarantine period. Instrumental observations made by the Geophysical Monitoring Center (GMC) at the Institute of Geosphere Dynamics (IGD), Russian Academy of Sciences, show that the quarantine-related decrease in production activity caused significant changes in the amplitude and spectral characteristics of acoustic noise above the city, as compared to the long-term averages. During the quarantine period, the amplitude of the main spectral components and the average amplitude of acoustic noise decreased by more than two times. The diurnal variation of the amplitude of noise caused by production activities in the daytime was much less evident. Our findings can be useful in determining the characteristics of technogenic noise sources and assessing its contribution to the total acoustic noise level of the city.