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In this paper, an innovative heat management solution for the Light Emitting Diodes (LEDs) based on direct impingement cooling by Piezo fan has been proposed and evaluated. Round Piezo fans with 26 to 30 mm blade diameter, 1 to 5 mm fan thickness and narrow flow orifice (∼ 3 to 7.5 mm) were developed which could provide very high velocity air jet (> 10 m/s) for impinging heat source footprint directly...
Contact resistance between a carbon nanotube and a metal is governed by the structure of the contact. In order to investigate an effect of the contact structure between a multi-walled carbon nanotube (MWNT) and the metal on electric properties, we studied the structural change of the contact region during the passage of a current by in-situ transmission electron microscopy with the simultaneous current...
The cooling technology that is most widely used for computers is air-cooling, because this is a mature technology with the least operation and maintenance cost. In order to push the limit of the air-cooling capability, enhancement of heat transfer from the processor to cooling medium is needed. Recently, the processor has multi-cores such as dual-cores, quad-cores. So, the heat dissipation from the...
Surgical instruments with computerization is demanded to prevent medical error, the burden reduction of the nurse, quality improvement of the operation. In this study, a radio frequency identification tag was made from ceramic was developed. As the results, the sterilization characteristic of repetition was 2% of failure rate. The above-mentioned heating tolerance, the characteristic of ultrasonic...
In the new generation microprocessors, it is observed that the power density over the active surface can vary from uniform to non uniform modes depending on the clock speed and the processing load on the chipset. The latter mode of operation can result in hot spots on the microprocessors that can result in the increase of the local temperature above the permissible limit and ultimately in the failure...
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