Tritium generation presents a significant hazard during operation of nuclear reactors and necessitates safety precautions in the case of a combustion incident. Accurate kinetic models should inform these safety precautions, however, reliable tritium data do not exist to generate such models. This work focuses on laminar flame speed, which is an important component of kinetic models. Current estimates based on established kinetic theories and experimental measurements of the other isotopes of hydrogen predict tritium to have a flame speed approximately 70% that of standard protium over a broad range of stoichiometries at one atmosphere in air. These estimates are based solely on isotopic mass differences and do not account for radioactive decay, which, in the case of tritium, is energetic enough to cause significant radiolysis reactions and potentially alter the radical pool for combustion. Simulations of a protium flame present compelling evidence that hydrogen flames are controlled by preferential radical diffusion from the rigorous flame region towards the unburned gases and not by heat conduction and dissociation of stable molecules. These flames rely on very low radical concentrations at the initiation region of the flame and the chemistry may be altered by a slight increase in radicals due to radioactive decay. This work also presents an experimental method suitable for measuring these radioactivity effects on tritium flame speed utilizing direct measurements of a flame propagating through a transparent tube. Measurements of protium and deuterium flame speeds using this method have proven highly repeatable and consistent with literature values while consuming much less reactant than other potential methods.

Several propagation channel models are designed to verify signal behavior in specific environments for future 5G cellular networks. Hence, with the massive development and demand of indoor wireless systems, a suitable design prior to deployment is required for energy and cost-efficient implementations. These propagation channel models then should be designed to detect weak points in environments and enhance the accuracy of propagation channel modeling in any diverse indoor environment. This work presents the radio propagation analysis of millimeter waves using indoor model-based computational simulations of wireless coverage and material characterization at 28 GHz. Furthermore, the material characterization of common building materials is presented based on excess loss and penetration loss of the propagations in an indoor environment. To perform the analysis, a time static simulator in MATLAB with site-specific maps, deployments and an Indoor 3D propagation model are used to predict path loss in Line of Sight (LoS) and Non-Line of Sight (NLoS) conditions. / Flera spridnings kanal modeller är utformade för att verifiera signal beteende i specifika miljöer för framtida 5Gmobilnät. Med den massiva utvecklingen och efterfrågan på trådlösa inomhussystem krävs därför en lämplig design före driftsättning för energi och kostnadseffektiva implementeringar. Dessa spridnings kanal modeller bör sedan utformas för att upptäcka svaga punkter i miljöer och förbättra noggrannheten i föröknings kanal modellering i alla olika inomhusmiljöer. Detta arbete presenterar radio spridnings analysen av millimetervågor med hjälp av modellbaserade beräknings simuleringar inomhus av trådlös täckning och material karakterisering vid 28 GHz. Dessutom presenteras material karakteriseringen av vanliga byggmaterial baserat på överskottsförlust och penetrations förlust av förökningarna i en inomhusmiljö. För att utföra analysen används en statisk tids simulator i MATLAB med platsspecifika kartor, distributioner och en inomhus 3Dspridnings modell för att förutsäga banförlust i villkor för siktlinje (LoS) och icke-siktlinje (NLoS).