Objective. The purpose of the article is an experimental study of a thermoelectric system (TES) for the treatment of periodontal diseases by the method of local hypothermia.Method. An experimental stand and a technique for measuring prototypes of TEC for the treatment of periodontal diseases by the method of local hypothermia are described. The experimental stand is made on the basis of the measuring equipment of the laboratory of semiconductor thermoelectric devices and devices of the FSBEI HE "Dagestan State Technical University". In the first version of the TES, two thermoelectric modules (TEMs) are directly mated with the simulator of the periodontal area through a silicone layer, and in the second, thermal contact between the thermomodule and it is made through a special highly thermally conductive nozzle.Result. Graphs of the time dependence of the temperature change of the control points of the experimental samples of thermal power plants for the treatment of periodontal diseases by the method of local hypothermia at various TEM supply currents were obtained. The control points were the cold and hot junctions of the TEM, periodontal simulator, heat sinks from the hot junctions of thermal modules.Conclusion. As a result of the measurements, it was found that it is possible to achieve the required level of decrease in the temperature of the periodontal area using standard TEMs of the Kryotherm LLC (St. Petersburg) type TV-17-1.4-1.15 and DRIFT-1.2. In this case, the duration of the output of the samples to the regime in the first case is 230 s, and in the second - 320 s. The deterioration of the dynamic characteristics of the second version of the device is associated with the presence of a highly thermally conductive nozzle. As a result of full-scale tests, it was shown that the use of forced air and liquid cooling to remove heat from TEM hot junctions is sufficient to comply with the required temperature regimes of hypothermia.
Objective. The aim of the study is to develop a mathematical model for determining the temperature field of a human eyeball under thermal influence on its anterior segment.Method. A mathematical model has been developed to determine the temperature field of a human eyeball when exposed to its anterior segment.Result. The temperature dependences of characteristic points inside the eyeball on time during cyclic exposure to heat flow on the anterior segment are obtained, as well as graphs of temperature distribution along the optical axis of the eyeball when applying heat flow.Conclusion. The developed mathematical model allows us to take into account the thermophysical characteristics of all the main structures of the human eye, and also shows the effectiveness of temperature massage of the ciliary body and lens.
Ранняя диагностика раковых заболеваний является важнейшим мероприятием в борьбе за жизнь больного. В работе предлагается новая методика и технические средства ранней диагностики в онкологии, которые основываются на представлении биологического объекта в виде системы с переменными во времени параметрами (СПВП). Ключевые слова: онкология, импеданс, онкомаркеры, системы с переменными во времени параметрами, параметрические системы, обобщенный резонанс, уравнение Хилла, БТС-МН. Early diagnosis of cancer is the most important measure in the struggle for the life of patient. In the work is proposed a new method and technical means for early detection in oncology, based on biological object presentation in the system with the time-variable parameters (STVP).
Objectives This work was devoted to the research of thermal processes that occur in the reflex areas of the human body, in particular, in reflexogenic areas of the human foot, under the thermal influence under ambulatory conditions.Method A model of thermal impact on the reflex areas of the human body was developed on the basis of a semiconductor thermoelectric device. A simplified physical model was studied, which does not consider heat exchange in thermoelectric batteries (TEBs) and elements of TEBs pairing with separate reflex zones.Results Diagrams for temperature distribution throughout the foot at different values of heat flow and diagrams of temperature changes over time were obtained. The thermal influence of a TEB brought in thermal contact with the opposite surface of the foot is negligible in this case; this is due to the low thermal conductivity of foot tissues, as well as insignificant thermal flows on its surface (low-power TEBs were used for such procedures).Conclusion The developed model of a semiconductor thermoelectric device for treating the reflex areas of the human body – in particular, the foot – allows an investigation of thermal processes occurring during the thermal treatment of biologically active points of the human sole. It is established that local temperature impact on a biological object does not result in significant temperature difference over its thickness.
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