For the problem of modeling high-mix and variable-batch flow manufacturing system, the thesis focus on method of mixed processing task and mechanism of constructing manufacture unit. First, decompose the processing task into Manufacturing Task Tree (MTT for short) according to the level of ‘orders-products-components-fittings-parts’. Then decompose each level node of the MTT to task cell. Then on the basis of processing task, we construct the framework of processing tasks management for group mixed flow manufacturing and analyze the mechanisms of building manufacturing unit for high-mix and variable-batch flow manufacturing system. Finally, we established the model of high-mix and variable-batch flow manufacturing system.
Novel band-gap tuning effects by external electric or magnetic fields in Hg-based quantum wells and superlattices are studied theoretically. It is found that in Hg-based quantum wells the band gap can be dramatically changed by applying an electric field perpendicular to the well interfaces. In Hg-based diluted magnetic semiconductor superlattices, the optical cutoff wavelength can also be substantially tuned by a magnetic field at 77 K. Possible device applications of these new band-gap tuning effects include high-speed optic modulators, nonlinear optic devices at wavelengths of 4 to 15 μm, and cutoff wavelength tunable infrared or far-infrared detectors.
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