Authors:Arsenijs Temjašovs; Jevgēnijs Tereščenko, Vladimirs Šestakovs, Nikolajs Kulešovs, Zbigniew Koruba Abstract: Abnormal situations in flight arise when an aircraft in normal flight mode is exposed to one or more unfavourable factors. Therefore, such situations have a pronounced random nature. To assess the degree of danger of contingencies, it is convenient to use the Airworthiness Standards governing the list of situations and probability of their occurrence in flight. The degree of danger can be determined from the assumption that during the life of the aircraft each of the four contingencies will give the same level of risk. By combining all contingency situations with their normalized indicators and using this assumption, we can quantitatively determine their degree of danger (risk level) in the form of probabilistic indicators. PubDate: Mon, 22 Mar 2021 12:54:23 +020
Authors:Andrii Grekhov; Vasil Kondratiuk, Svitlana Ilnitska Abstract: MIMO-OFDM models of RPAS communication channels based on LTE Standard were built. Dependencies of the BER on the SNR for Extended Pedestrian A and Extended Vehicular A models using 2-by-2 multiple antennas were obtained. Dependencies of the BER on the SNR for different levels of Frequency Offset at satellite transponder were studied. PubDate: Mon, 22 Mar 2021 12:54:22 +020
Authors:Renāte Kalniņa; Alise Romule Abstract: The introduction of invasive aquatic species in new environments has been identified as one of the four biggest threats to the world's oceans causing serious threats and harm to both ecology and human health. There is a major exchange of ship’s ballast water over longer distances between continents and regional seas, and it has been known for decades that ballast water transfers organisms to new ecosystems, where the strongest, most aggressive and adaptable species can survive and become invasive under favourable conditions. The focus of the research is to study available ballast water control technologies to determine their suitability and effectiveness in the reduction of harmful aquatic organisms and compounds in the Baltic Sea. PubDate: Mon, 22 Mar 2021 12:54:22 +020
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