In the previous period, PhD Aleksandar Nešović devoted his attention to the new solar collector concept. One part of his research was focused on wastewater treatment. The largest part of the research in the previous period was dedicated to energy efficiency in buildings and building simulations, promoting the Plus-Energy Building concept. PhD Aleksandar Nešović's research will focus on buildings and the environment in the future, connecting new smart RES technologies with natural (traditional) materials.