During prolonged sessions of pulsed heat (PH) carried out according to the earlier designed technique the authors also recorded on a continuous basis the polyelectrogram of sleep and parameters of the temperature topography of the body. The findings have shown a biphasic nature of the reaction, as well as correlation between the dynamics of the level of awakening and the parameters of the body. Impact of PH on the basic (nasolabial) and additional zones has been found to be fairly effective. The results of two series of studies have demonstrated that incorporation into the therapy of additional zones can augment both soporific effects of PH and its beneficial impact on the cerebral circulation. The data obtained, apart from being of practical significance, have a theoretical importance since they contribute to the better understanding of the physiological mechanisms of PH.
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Thermal engineering can be used to exploit absorption in a silicon optical cavity. In this work, the steady state profile of the heat generated by absorption is shaped and used to generate a dynamic heterostructure in a weakly confined silicon optical cavity. This is demonstrated in an edge defect photonic crystal optomechanical cavity to produce phonon lasing and sub-GHz optical pulsing with photon-phonon cooperativity of 0.
View Article and Find Full Text PDFJ Therm Biol
January 2025
School of Exercise and Health, Shanghai University of Sport, Shanghai, 200438, China. Electronic address:
This study investigated the single and combined effects of environmental heat stress and physical exercise on executive function (EF) performance, prefrontal cortex oxygenation, thermoregulatory responses and subjective perceptions. Sixteen subjects participated in four experimental sessions: two under moderate environmental conditions (23 °C), with and without physical exercise (R23, E23), and two under hot environmental conditions (35 °C), with and without physical exercise (R35, E35). In each session, participants completed EF tasks before and after 1 h of passive rest or 45 min of moderate-intensity cycling followed by 15 min of rest.
View Article and Find Full Text PDFProg Addit Manuf
July 2024
Empa Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland.
Fast and accurate representation of heat transfer in laser powder-bed fusion of metals (PBF-LB/M) is essential for thermo-mechanical analyses. As an example, it benefits the detection of thermal hotspots at the design stage. While traditional physics-based numerical approaches such as the finite element (FE) method are applicable to a wide variety of problems, they are computationally too expensive for PBF-LB/M due to the space- and time-discretization requirements.
View Article and Find Full Text PDFSensors (Basel)
January 2025
Department of Sports Science and Sports Development, Faculty of Allied Health Sciences, Thammasat University, Pathumthani 12120, Thailand.
This research has developed a heat stroke warning system prototype for athletes utilizing the following sensors: DHT22, GY-906-BAA MLX90614, MAX30102. The device calculates the heat stroke risk and notifies users. The data is recorded, stored, displayed on a free-access website which graphs body temperature, ambient temperature, humidity, heart rate and heat stroke risk, and provides notifications for athletes engaged in outdoor activities.
View Article and Find Full Text PDFMaterials (Basel)
January 2025
School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China.
C-UHTC is an ideal aerospace material because of its exceptional properties, but its machinability is facing great challenges. Electrical discharge machining (EDM) offers a potential solution, but its removal mechanism remains unclear, lacking reliable prediction tools to guide the actual production. This paper deeply explores the EDM removal mechanism of C-ZrB-SiC through single-pulse experiments, high-speed camera observations, and thermal-fluid coupling simulations, revealing key processes like heat transfer, phase transformation, molten pool dynamics, crater formation, and reinforcing phase effects.
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