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In pulsed applications, such as radar, estimates of FET channel temperature based on time-averaged modeling are inaccurate; the analysis must be done dynamically. A thermal model of an X-band power amplifier is constructed and validated against direct measurements by time-resolved Raman thermography, complemented by laser thermo-reflectance and infrared imaging. The consequences for radar system design...
This paper presents an analytical approach to thermal behaviors of laser welding of polymers. Laser polymers processing leads to various thermal, photophysical, and photochemical processes within the bulk and on the material surface. The understanding of these processes is beneficial to obtaining the high quality precision engineering of polymers. The Green's function of a multi-layer plate for the...
This paper presents a method for assessment of thermal properties of multi-layers structures using contrast analysis of temperature response registered with photoacoustic technique. It is based on the analysis of the amplitude spectrum of temperature contrasts. Photoacoustic signal is registered in time domain with disadvantageous signal-to-noise ratio. Due to that the new approach for excitation...
We report a new compact high power laser system using zig-zag optical path based on the cryogenic Yb:YAG total-reflection active-mirror laser for ten-kilowatts. The thermal analyses of the laser have also been discussed.
The SrTiO3 and Y-doped SrTiO3 polycrystalline sintered bodies were synthesized by the polymerized complex (PC) process and the subsequent hot pressing at 1473 K for 1 h or at 1673 K for 2 h in Ar atmosphere. The X-ray diffraction patterns of the SrTiO3 and Sr0.9Y0.1TiO3 samples synthesized by the PC process and hot pressing at 1473 K showed that these samples were mostly composed of the SrTiO3 single...
Nanostructuring is one of the effective approaches to lower the thermal conductivity of materials. Nanostructured skutterudite-related compounds CoSb3, Fe0.5Ni0.5Sb3, Fe0.25Ni0.25Co0.5Sb3 and Te-doped CoSb3 were synthesized by a solvothermal route. The bulk materials were prepared by hot pressing or spark plasma sintering from the solvothermally synthesized nanopowders. The thermal conductivity values...
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