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In old times, hydrotechnical constructions, mostly dams were built for the single purpose of water supply or irrigation. As civilizations developed, there was a greater need for water supply, irrigation, flood control, navigation, water quality, sediment control and energy. Demand for water is steadily increasing throughout the world. There is no life on earth without water, our most important resource apart from air and land. During the past three centuries, the amount of water withdrawn from freshwater resources...

The data recorded by the National Oceanic and Atmospheric Administration (NOAA) and the National Aeronautics and Space Administration (NASA) have led to the cataloguing of the year 2016 as the warmest year on worldwide meteorological records. The two previous records listed were the years 2014 and 2015. Phenomena like El Nino and La Nina are responsible for the cooling or heating of the upper tropical zone of the Pacific Ocean. This causes variations in global wind patterns and weather, thus leading to short-term ...

Mathematical models of the dynamics of spacecraft with a solar sail to control translational orbital motion and rotation of the whole structure are provided the stability of the sail orientation relative to the flow of sunlight. The behavior of solutions in a neighborhood of the possible equilibrium or stationary state of motion is taken into account. Change in the stability depending on the tasks and the transformation of equations that describe the perturbed processes is taken into account. It is possible to var...