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We have developed a new experimental setup specifically designed for measuring thermal conductivity on technical superconductors in the range of temperatures 3–330 K in magnetic fields up to 21 T. Three wires, produced by the powder-in-tube technique, the bronze route, and the internal tin restacked-rod process, respectively, have been investigated. We show that, due to the...
Preliminary investigations have been conducted to discuss the possibility of using a micro-machined suspended wire as a 3ω based sensor for the measurement of gas thermal conductivities. Thermal responses of various pure gases and helium-nitrogen mixtures have been measured using a 3ω setup and compared to an one-dimensional analytical model derived by Yusibani et al. Deviation of the measured thermal...
The 3ω method has been extensively used to characterize thermal properties of various type of samples: dielectric solids, superlattices, thin films, liquids, nanofluids, etc. However, only few works were dedicated to study samples in the gas state using this technique. In this focus, we present a new approach based on a 3ω method, to measure the thermal conductivity of gas samples. Our sensing element...
In order to apply nano-particles to the ammonia-water absorption refrigeration, TiN-ammonia water nanofluids (the binary nanofluids) were prepared by two steps. The dispersion stability of the binary nanofluids in different mass fractions of nano-particles and ammonia is investigated by the light absorbency ratio index methods. And the thermal conductivities were measured on the basis of the dispersion...
The continuous increase in interconnect joule heating and the advent of low-k ILD materials poses serious thermal challenges for multilevel interconnects in deep nanometer technologies. Vertical heat sinking paths are severely constrained by the limited via-density of the upper metal layers and poor thermal conductivity of the inter-layer dielectric. The lack of adequate vertical thermal conduction...
The high-voltage electric power is generally transmitted by underground cables in urban. Considering about the high cost for underground cable, it is necessary for us to get accurately biggest ampacity of electric cables in order to insure the operation of cables in safe. It is relationship of heat transfer with cables and soil. The coefficient of thermal conductivity of soil has great influence on...
Cooling is important to keep the temperatures of the highly integrated silicon electronic devices and power devices e.g. power MOSFET, IGBT. Yamaguchi et al. have proposed a new scheme to cool down the devices by its own current named ldquoself-cooling devicerdquo, in which the cooling process uses Peltier effect. In the proposed scheme, we should use the materials that have high thermal conductivity,...
To study the effect of double filling of the skutterudite iron antimonides on the thermal conductivity, we have synthesized dense samples of Ca1-xLaxFe4Sb12 (0 les times les 1) and Ca0.3La0.6Fe4-yCoySb12 (y = 1, 1.5) by the spark plasma sintering technique. Electron-probe microanalysis revealed that the double-filled samples with x = 0.25, 0.5, and 0.75 consist of three phases of micrometer scale;...
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