Purpose. Evaluation of the efficiency of open geothermal systems in flooded and drained mines of the Donetsk basin for heat supply of buildings with maintaining a safe mine water level. Methods. Both circulation and non-return geothermal systems for the mine water heat recovery are analyzed. We proposed the energy and cost criteria for evaluating the effectiveness of open geothermal systems based on a comparison of the produced thermal energy with the energy costs for its production. The criteria use the relationships of thermodynamics, hydraulics, analytical formulas for calculation of ground water flow and methods to calculate the heat demand of indoor spaces. Findings. The estimated ranges of thermal capacity from a few tens kW to a few MW and a coefficient of performance (COP) conversion factor of 3.5-6.8 achievable by geothermal systems for the studied closed mines of Donbas correlate well with the values of these indicators at open geothermal systems operated in different countries, which shows the technical and economic feasibility of the installation to cover local heat demands. The possibility to fully cover the needs for thermal energy is shown on the example of buildings with office spaces for staying of a few hundred people. We demonstrate how to preliminary calculate the parameters of mine water circulation with maintaining the safe level in terms of keeping the ground water quality in the areas adjacent to the mine. Originality. The developed criteria and calculation methodology allow to realistically evaluate the parameters of the efficiency of operation for open non-return and circulation geothermal systems, taking into account mining, geological and technology conditions, to prioritize the exploration of geothermal resources in mines and to evaluate the parameters of mine water circulation with maintaining the safe mine water level. Practical implications. The study showed the feasibility of installation and effective operation of open geothermal systems at the mines of the Donetsk basin for heat supply of buildings located in the adjacent areas with maintaining a safe mine water level.

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The life and work of academician Alexander Alexandrovich Vishnevsky are presented. During the Great Patriotic War, Alexander Alexandrovich served as an army surgeon and chief surgeon for a number of fronts. He became the director of the A.V. Vishnevsky of the USSR Academy of Medical Sciences in 1948 and later served as the chief surgeon of the USSR Ministry of Defense starting in 1956. As a student and the closest associate of his father A.V. Vishnevsky, Alexander Alexandrovich participated in the creation of a domestic surgical school and then became its leader after his fathers death. Analysis of the early works of Alexander Alexandrovich reveals his devotion to the anatomical substantiation of local anesthesia based on the method of creeping infiltrate. The well-known monograph Novocaine blockade and oil-balsamic antiseptics as a special type of pathogenetic therapy (1952), written by Alexander Alexandrovich and his father, is the result of many years of research on the role of nervous trophism in the pathogenesis of a number of surgical diseases. Alexander Alexandrovich also found that in the advanced stages of medical evacuation, surgical interventions on the wounded can be performed under local anesthesia by using the creeping infiltrate method. In peacetime, A.A. Vishnevsky continued to investigate the issues related to anesthesia and nervous trophism and collaborated with his colleagues to address a number of other pressing problems, including the surgery of the heart and blood vessels, mechanisms for compensating for impaired functions of organs and systems, the use of cybernetics and electronics in surgery, burn injuries, and the use of polymers in surgery. Moreover, A.A. Vishnevsky was the first surgeon in Russia to perform a successful open-heart surgery under the conditions of artificial circulation (1957). He was awarded the highest Ren Leriche International Prize for his work on local anesthesia during heart surgery (1955).

The article is devoted to the 150th anniversary of the birth of Professor Albert Yakovlevich Damsky who was an urologist-innovator and a teacher. The main stages of scientific and pedagogical activity and practical activity of the scientist are presented. A.Ya. Damsky published about 60 scientific papers, also he was the author of the first two Soviet urology textbooks and a creator of an operating cystoscope of his own design. Moreover he was the first to perform transvesical adenomectomy.