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THz radiation from series of GaAs and InAlAs surface intrinsic-N (SIN) structures with the built-in electric field as bias is studied. When the bias exceeds the so-called critical electric field, the amplitude of THz waves radiated is independent of the built-in electric field. However, the THz amplitude is proportional to the number of photo-excited free(More)
Ball impact test and ball shear test have been used to investigate the joint strength. The joint strength of lead and lead-free solder joints under high strain rate condition were examined. Microstructure in the as-reflowed condition and fracture surfaces were investigated. The intermetallic compounds of Sn-3Ag-0.5Cu joints demonstrated as layer-type (Cu,(More)
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