A simulation of the Stirling engine was carried out, where the temperature variability in the cooler and heater is taken into account, and the engine itself generates electric current. The study was carried out in the temperature range when the piston and displacer move synchronously. The possibility of increasing engine power by reducing hydraulic resistance in the regenerator ...

This article presents the results of a study on the influence of a three-level dispersed composition of the clinker component of a binder, which includes coarse, medium, and fine fractions, on the physical and mechanical properties of self-compacting concrete (SCC). One of the current challenges in SCC technology is enhancing its durability and resistance to aggressive ...

This paper presents the results of a study on radio-absorbing materials in the ultra-high frequency range of 78-118 GHz. Crystalline graphite powder (particle size 0.1 mm) was considered as the main radioabsorbing material. Epoxy resin was used as a substrate and a binder. The samples were prepared by dispersing the graphite powder across the surface of the epoxy resin ...

This work studied the effect of sequential irradiation by krypton and helium ions at room temperature on the composition and structure of CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs). Irradiation of the HEAs by 280 keV Kr14+ ions up to a fluence of 5 × 1015 cm–2 and 40 keV He2+ ions up to a fluence of 2 × 1017 cm–2 did not alter their elemental distribution and ...

The paper presents a model of an open resonator exhibiting a single high-Q eigen oscillation within a one-octave frequency band. The resonator is synthesized by integrating a diffraction radiation antenna, which comprises a segment of a dielectric waveguide above a metal substrate with a diffraction grating, into a system of flat reflectors aligned parallel to the wave fronts ...

External and internal microclimatic conditions, biodeterioration, anthropogenic factors, etc, influence the natural stone support for artifacts and built heritage. Based on this fact, the present study explores the effectiveness of nano-TiO2 in preserving and enhancing the durability of natural stone used in the façades of heritage buildings, focusing on the Markovits-Mathéser ...

This paper presents the results of laboratory studies for the distillation of mercury from depleted coal sorbents produced in gold recovery factories using CIP technology. The mercury content in these materials is more than 1%. The developed technology was tested in a large-scale laboratory on a pilot vacuum sublimation electric furnace with the rheological movement of ...

Organic phototransistors and photoresistors may become key devices in photonics and optoelectronics in the near future, providing high sensitivity and controllability in response to light signals. Their operating principle is based on the conversion of light energy into electrical signals, which makes them indispensable in various applications, including sensors, solar cells ...

Road infrastructure sustainability and pavement performance may be increased by using waste materials like polyethylene terephthalate (PET) and polyethylene waste (PE waste) in polymermodified asphalt mixtures. As seen by a more pronounced rise in the softening point, which exceeds 110 ◦C with 8% PE waste, PET was found to improve the tensile strength, resistance to cracking, ...

The optimization of recycling processes for waste motor oil (WMO) into diesel fuel is crucial for sustainable waste management and resource recovery. This study explores the application of novel deep eutectic solvents (DES), specifically methyltriphenylphosphonium chloride (MTPPCl) and ethylene glycol (EGL)-based DES, for the efficient removal of naphthalene from WMO. Density ...