Słowa kluczowe: Ferroelectric ceramics, perovskite structure, barium titanate, diffused phase transition, scanning electron microscope, X-ray emission, energy dispersive spectrometer, characteristic spectrum, detection limits, nitrification, bioreactor, fluidization, perovskite, phase transition, mechanochemistry, frictional materials, tribology, composite powders, state of sediment, hydrogen sulphide acid determination, molecular absorption spectrometry, silver sulphide precipitation, pig slurry, physicochemical properties, microbiological composition, fertilizing components, transient heat conduction, renewable heat sources, ground heat exchangers, hyaluronic acid, knee cartilage, osteoarthritis, viscosuplementation, interpenetrating polymer network (IPNs), scaffolds, BFRs, HBCD, food analysis, GC-MS, LC-MS, separation of oil-in-water emulsions, organic deemulsifiers, nitric acid, nitrogen oxides, exhaust gas, physical absorption, regeneration, adsorption kinetics, approximate kinetic equations