High-temperature threshold characteristics of a symmetrically graded -doped InAlAs/ InxGa1−xAs/GaAs x=0.5→0.65→0.5 metamorphic high electron mobility transistor MHEMT have been investigated. The thermal threshold coefficients, defined as Vth / T, are superiorly low at 0.9 mV/K from 300 to 420 K and at −0.75 mV/K from 420 to 500 K. An interesting polarity change of the thermal threshold coeffici...

In recent years, impinging streams have received increasing interest for their high efficiency in heat and mass transfer. This numerical study was conducted to investigate flow and heat transfer characteristics of one-way opposing jets of non-Newtonian fluids. Effects of Reynolds number impinging angle, momentum ratio and flow behavior index on mixing index were evaluated. The results showed im...

Dense Silicon nitride was investigated to determine the effect of its microstructural parameters and densification on thermo-mechanical properties and thermal stress resistance to fracture initiation during a hot or cold mechanical and thermal shock testing. The different materials and microstructures were obtained by changing the parameters such as the type of the powder, additive, forming p...

In this paper, we, for the first time, present the effects of the thermal annealing of the W/SiO 2 multi-layer Bragg reflectors on the resonance characteristics of the ZnO-based film bulk acoustic wave resonator (FBAR) devices. In order to improve the resonance characteristics of the FBAR devices, we employed a thermal annealing process after the Bragg reflectors were formed on a silicon substr...

The article examines the solar energy-based heat supply system of individual rural houses as object research. Currently, volume construction standard in areas Republic Uzbekistan is growing, which turn leads to problem saving traditional energy resources and uninterrupted their heating system. author proposed a scheme combined with flat collector water boiler order save fuel energy-efficient ho...

Thermal buckling behavior of functionally graded Euler-Bernoulli beams in thermal conditions is investigated analytically. The beam with material and thermal properties dependent on the temperature and position is considered. Based on the transformed-section method, the functionally graded beam is considered as an equivalent homogeneous Euler-Bernoulli beam with an effective bending rigidity un...