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For the high-power LED applications, TAV (Through-aluminum-nitride-via) substrate with a high thermal conductivity provides better heat dissipation. However, the high thermal expansion coefficient mismatch between the AlN (Aluminum nitride) and copper film may cause the failure, and thus affect the reliability of TAV substrate. The objective of this study is to evaluate the reliability of TAV substrate...
Pole-changing permanent magnet (PM) machines, which can offer wide operating speed range, have attracted global attention in industry application [1-3]. However, the previous pole-changing PM machines adopting distributed winding, suffer from lengthy end winding and relatively low efficiency. Therefore, this paper presents a new variable flux pole-changing PM memory machine (VF-PCPMMM) employing fractional...
Transverse flux permanent magnet generator (TFPMG) has attracted a great attention for the large torque and high efficiency at low speed, as well as the prominent capability of carrying considerable pole numbers [1]. Many new TFPMGs with attractive structures have been proposed such as a novel flux switching transverse flux PM generator (FS-TFPMG) presented to improve the stator space utilization...
The objective of this study is to propose an in-situ measurement of the warpage of the PCB during reflow process (or SMT process) using strain gauges. In the experiments, a full-field shadow moiré is used for measuring the out-of-plane deformations (or warpage) of a bi-material plate and the PCB with DIMM sockets during solder reflow heating. A finite element method (FEM) is used to analyze the thermally-induced...
The purpose of this study is to in-situ measure the warpage of the PCB with surface-mount dual in-line memory module (DIMM) sockets during reflow process by using strain gages. In the experiments, a full-field shadow moire is used for measuring real-time out-of-plane deformations (or warpage) of the PCB with DIMM sockets under heating condition. A finite element method (FEM) is used to analyze the...
This paper demonstrates the suppression of parasitic resonance in a piezoresistively transduced longitudinal mode MEMS resonator, wherein beams are electrostatically excited in a combined extensional mode with an associated frequency-Q product of 3.28 ?? 1012. The response of the beam is sensed using both capacitive and piezoresistive transduction principles. The resonator consists of six parallel...
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