Nowadays all news about the new coronavirus disease type arouses interest and concern among specialists around world. Children often are not exposed to COVID-19 virus or they just have mild course of according currently available data. These data may also explain why children much lower incidence in comparison adults. The results epidemiological observations performed by different researchers’ ...

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We review the search for the top quark conducted by the DØ collaboration using data from the Fermilab pp collider. Based upon a preliminary analysis of an integrated luminosity of about 13.5 pb −1 , we have searched for tt production and decay in the experimental channels involving a pair of dileptons (e or µ) plus jets, or single leptons plus jets. Summed over all channels, we observe 7 events...

The ionizing spectral energy distribution of quasars exhibits a steepening of the distribution short-ward of 1200 Å. The change of the power-law index from approximately −1 to −2 so far has been interpreted as being intrinsic to quasars. We study an alternative interpretation, in which a tenuous absorption screen is responsible for the change of index. We find that the most successful function ...

This paper proposes a feature-based multi-sensor fire detector operating on ordinary video and long wave infrared (LWIR) thermal images. The detector automatically extracts hot objects from the thermal images by dynamic background subtraction and histogram-based segmentation. Analogously, moving objects are extracted from the ordinary video by intensity-based dynamic background subtraction. The...