Physical Mathematics

Photoluminescence stands out among the practical applications of quantum physics in engineering and architecture. After being exposed to solar energy, some substances release photons as a result of the photoelectric effect. These substances were used to create a photoluminescent effect on bicycle paths in research conducted in Europe and Mexico. The research aims to investigate how polymeric residues interact with the luminescent properties of rare-earth materials when making concrete artifacts to illuminate bike and pedestrian paths. The concrete blocks were made with polymeric waste from recycling and luminescent materials, then they were exposed to sunlight and tested for mechanical strength. Experiments revealed that concrete's polymer residue significantly boosts photon emission, particularly when processed via extrusion. Even though the combination of polymers and photoluminescent materials weakens concrete, the research objectives for a product intended to illuminate paths for cyclists and pedestrians were still met.

The usage of pneumatic bioreactors in bioprocesses is on the rise because they offer adequate heat and mass transmission, quick mixing, and effective solids suspension. In this study, oxygen transport from a bubble column bioreactor with a square cross section was studied numerically and experimentally using computational fluid dynamics (CFD), and the outcomes were compared to experimental data. In the numerical simulations employing the two-fluid Eulerian model, several specific air flow rates (1.0, 3.0, and 5.0 vvm) as well as drag and lift interfacial forces were taken into account. The simulations that took lift force into account produced results that were more in line with the experimental data, with the greatest values of kLa being discovered for the higher specific air flow rate (5 vvm) that was examined in this work.