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As one of challenges, clip design for bonding area is becoming smaller and smaller to achieve die size requirement, better view inspection and efficient solder flux cleaning. However, with a small bonding area, there will be a concern on high thermal resistance during working condition, especially under a surge current, in which junction temperature may be higher than the melting temperature of soft...
The ultrasonic-rebound comprehensive method is one of the most used methods for in-situ testing concrete strength, it can remedy the single test's unperfected of the rebound method and the ultrasonic method, improve the detection precision. The in-situ strength curve of traditional method is obtained most from test blocks of the laboratory, which isn't coincident with the practical engineering because...
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