o:1794 Uloga veličine i oblika molekulskih propelera u njihovoj dinamičnoj stabilnosti u modelu kvantnog Braunovog rotatora The role of size and shape of molecular propellers in their dynamic stability in a quantum brown rotator model: doctoral dissertation : doctoral dissertation sr The subject of this doctoral dissertation research is the rotationaldynamics of molecules of a specific shape, the so-called molecularpropellers. The main task of the dissertation is to consider theinfluence of the size and shape of the mentioned molecules upon theirdynamic stability. The model used is based on the application of thetheory of open quantum systems and the master equations of Caldeiraand Leget, as a quantum model of Brownian motion. The size ofmolecular propellers was introduced into the model through thedependence of the moment of inertia and the strength of theinteraction with the environment on the number of blades. Dynamicstability is examined by analysis of standard deviations of the angleand momentum and by the method of quantum first time passage. Theobtained results indicate a strict and complex dependence of dynamicstability on the number of blades, temperature and strength ofinteraction with the environment. The results also show that toachieve the desired level of dynamic stability, it is not possible toapply simple rules but a combination of different stability criteria anda procedure similar to engineering optimization is necessary. Biografija autora sa bibliografijom: list. 211;Bibliografija: listovi: 207-210. Datum odbrane: Quantum mechanics 91552100 49602313 91552101 8526 2022-11-21T18:11:32.053Z 45 no 46 Igor, 1972- Petrović 75789321 2021 63 mentor Jasmina, 1973- Jeknić-Dugić 26145895 2021 63 član komisije Goran, 1963- Đorđević 11533671 2021 63 član komisije Ljubiša, 1966- Nešić 6968935 2021 63 član komisije Milan, 1963- Pantić 13240679 2021 63 član komisije Momir, 1980- Arsenijević 24931687 2021 214 listova 3138349 http://phaidrani.ni.ac.rs/o:1794 no yes 12 2022-11-21T18:11:32.320Z 70 Braunovo kretanje, dekoherencija, otvoreni kvantni sistemi,prelaz iz kvantnog u klasično, uticaj veličine i oblika,dinamička stabilnost molekulskih propelera Brownian motion, decoherence, open quantum systems, transitionfrom quantum to classical, influence of size and shape, dynamicstability of molecular propellers 539.194(043.3) P 190 1738 18A07 18A0702 2021