Effect of channel geometrical configuration on the pressure distribution and stress failure in a running PEM fuel cell.rnImprovements of mixing process in a rapidly tubular flame burner.rnEstimating the effect of a phase change material on the performance of a photovoltaic unit using a five parameter model approach.rnFeasibility study and design of an ocean wave power generation station integrated with a decommissioned offshore oil platform in UK waters.rnOptimization of parameters of heating system with low-temperature water panels by changes of entropy.rnNumerical investigation of a micro-heat exchanger with various channel geometries.rnForecasting of photovoltaic power at hourly intervals with artificial neural networks under fluctuating weather conditions.