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More than 400nm broadband luminescence was obtained from 3 layered InAs/InP QDs array waveguides. InAs QDs were grown by Stranski‐Krastanov grown mode using selective MOVPE growth and double cap procedure. The selective MOVPE was performed using 16 stripe mask array with a wide mask at one side of the array. The heights of the QDs were controlled vertically by changing the first‐cap layer thickness...
Some factors that may affect human perception thresholds of the vertical whole-body vibrations were investigated in two laboratory experiments with recumbent subjects. In the first experiment, the effects of gender and age of subjects on perception were investigated with three groups of 12 subjects, i.e., young males, young females and old males. For continuous sinusoidal vibrations at 2, 4, 8, 16,...
We have successfully demonstrated the strain control of the self assembled Stranski - Krastanov (S-K) InAs quantum dots (QDs) using double-cap procedure. GaxIn1−xAs second cap layer was introduced to compensate the strain of InAs QDs, and obtained the Ga composition of GaxIn1−xAs second cap layer to increase the PL intensity and to minimize the fluctuation of QDs size.
Recently, development of lead-free solder is promoted. As plating materials, Sn metal is thought to be the best lead-free solder. However Sn is known to have a serious problem of whiskers growing spontaneously on the surface. The whiskers are liable to shorten electronic circuits. The mechanism of whisker growth has not yet been resolved. To solve the problem of whisker generation, it is important...
Tin whiskers grown on a Sn/Cu-plated polyimide (PI)-flexible substrate are a serious problem in electronic industrial application, because the whiskers lead to catastrophic electrical short circuit failures. Here, we report characterization of microstructures in the whiskers grown on a surface of Sn/Cu-plated PI-flexible substrate by cross-sectional transmission electron microscopy (TEM) to analyze...
High magnetic field was applied during Sn plating treatment for brass to change crystal orientation in the plating film. After prolonged heat treatment at 323 K, its effect on the formation of Sn whisker was investigated by scanning electron microscopic observations and X-ray diffraction (XRD). The XRD pattern of the film varied with the angle between the substrate and the direction of the magnetic...
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