No abstract

No abstract

The global informatization of modern society, development of telecommunication, communicular and information technologies - on the one hand and the powerful challenges to all humanity in the form of epidemics (coronavirus infection COVID-19, bird flu, various forms of pneumatic and hepatitis), natural and man-made disasters, military and political conflicts, wars - from the second, determine significant changes in priority forms of educational process, and distance learning (DL), in these conditions, becomes the only possible option for providing quality educational services with minimal financial expenses for its organization.

No abstract

Rails are one of the main elements of the upper structure of the railway track. The safety and smoothness of the movement of mobile units depends on their reliable operation. During operation, various defects and damages occur in the rails that can directly threaten the safety of traffic. These defects and damages have different causes and development mechanisms, which depend on many operational factors. Studying the causes of the appearance and development of defects in rails is one of the main tasks to increase the uptime of the railway. The rail side wear continues to be one of the basic reasons for removing rails from the rail track. Earlier studies have demonstrated an apparent effect of unbalanced acceleration, rail track parameters and geometrical irregularities (including bond ones) on rail wear. Mostly, the process is typical for small-radius curves the total length of which in Ukrainian railway network is rather great. The article presents the findings of numerical research into vehicle/track interaction under such operational conditions with consideration of existing and prospective structures of rail fastenings. The authors have concluded that train driving modes and rail foundation structure influence the rate of rail head side wear in small-radius curves on the rail track.