ANALYSIS OF HEAT TRANSFER THROUGH A CONCRETE SLAB WITH AN EMBEDDED PIPING NETWORK; ANALYSIS OF POSSIBLE FINANCIAL INCENTIVES FOR URBAN USERS OF RENEWABLE ENERGY TECHNOLOGIES;Analysis of the Radiation Characteristics of an Ultra-Large Array Antenna Consisting of the Element Apertures for Space Use;Application of lead chalcogenides in thermoelectric devices;APPLICATION OF SOLAR ENERGY TO OBTAIN HYDROGEN AND HYDROGEN CONTAINING GASES;Applied research concerning the direct steam generation in parabolic troughs