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The study examines a way to reduce stormwater runoff in urban conditions using the device of «green» roofs in the design and construction, reconstruction and overhaul of buildings and structures. The sewer system of modern increasingly growing cities often cannot cope with the load exerted on it. Therefore, an environmentally friendly and effective reduction of storm runoff is one of the main challenges in the field of urban planning today. Despite the fact that foreign works devoted to this topic, as well as the experience of practical application of roof greening technolo-gies abroad have proved a significant reduction in runoff, the question of the expediency of this method in Russian realities remains open. It is important to take into account not only the water-holding capacity of «green» roofs as such, but also the meteorological peculiarities of the territory where construction is planned, the methods of produc-tion technology and the construction materials used. Until now, the study of this aspect in the Russian Federation has not been given sufficient importance, which, in turn, delayed the introduction of modern technologies for the installa-tion of green roofs in our country, and also slowed down the development and approval of the necessary regulatory framework. The article provides a theoretical proof of the effectiveness of «green» roofs in reducing rain and snow-melt runoff in the climatic conditions of Central Russia, based on statistical and empirical data. The results obtained may be valuable for the further development of «green» technologies in construction and for ensuring environmental safety in our country.

The paper discusses the problem of searching for propellant-optimal trajectories of the International Space Station attitude control maneuvers involving spatial turns through large angles using attitude control jet thrusters. Development of such algorithms for controlling the ISS angular motion is currently a crucial task for Russian developers of the onboard software. In order to generate the optimal trajectory for the attitude control maneuver, the paper proposes to use the Lobatto pseudospectral method. This method allows stating the optimal control problem as a nonlinear mathematical programming problem which can be solved using the method of sequential quadratic programming. Simulation results demonstrated significant savings of attitude control thrusters propellant and life during station attitude control maneuvers in comparison with the algorithms that are currently used in the motion control system of the ISS Russian Segment. Key words: International Space Station, optimal control problem, angular motion control, pseudospectral method, nonlinear programming