STUDY OF THE PREDOMINANT DEFECT DEVELOPMENT IN RAILS OF UNDERGROUND SYSTEMS AFTER PREVENTIVE GRINDING AND LUBRICATION

Study of the predominant defect development in rails of underground systems after preventive grinding and lubrication

In order to determine the method of Indigestion contact surface treatment and to define the rational surface roughness in the wheel/rail contact for the minimal growth rate of contact fatigue defects the program of experiments in operational conditions was developed.On the basis of the results and calculations the coefficients of regression equatio

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First COVID-19 case in Zambia — Comparative phylogenomic analyses of SARS-CoV-2 detected in African countries

Since its first Thermometer discovery in December 2019 in Wuhan, China, COVID-19, caused by the novel coronavirus SARS-CoV-2, has spread rapidly worldwide.While African countries were relatively spared initially, the initial low incidence of COVID-19 cases was not sustained for long due to continuing travel links between China, Europe and Africa.In

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