Alexandru O. PAVELESCU1, Mărgărit PAVELESCU2
Abstract. In this work we use nonlinear methods to study atrial fibrillations: we construct the 3D attractors, generate the 2D maps, and calculate the Hurst exponent and fractal dimension, respectively, for signals collected from a patient during an atrial fibrillation crisis. Our results show that the normal and pathological cardiac dynamics can be characterized through specific patterns (strange attractors).
Keywords: In the context of the crisis generated by the Russian-Ukrainian conflict, a hypothetical scenario was devised involving a radiological dispersal device emission at Chernobyl premises. A decision support software system for radiological and nuclear emergencies was used, with the main purpose of identifying potential areas of influence on the territory of Romania. The atmospheric dispersion of radioactive materials was evaluated as a result of such RDD explosion also known as “dirty–bomb” with a load of radioactive Cs-137 and an activity of 10 TBq in the Chernobyl exclusion zone using real time meteorology prognosis data.
DOI 10.56082/annalsarsciphyschem.2025.1.16
1 Department of Life and Environmental Sciences, Horia Hulubei” National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), Reactorului Str. No. 30, PO-Box: MG-75126, Bucharest-Măgurele, Romania (e-mail: alexandru.pavelescu@nipne.ro)
2 Chairman of Physics Section, Academy of Romanian Scientists (ARS), Ilfov Street, No. 3, Sector 1, Bucharest, Romania (mpavelescu2002@yahoo.com)
PUBLISHED in Annals of the Academy of Romanian Scientists Series on Physics and Chemistry, Volume 10, No1