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CONVECTION CURRENTS
CONVECTION CURRENTS

Touch screens
Touch screens

... • Force activated so can use finger even with a glove, stylus or any other (non sharp) prodding device • Contacts are make or break so not pressure sensitive • Conductive coating reduces display brightness • Continual flexing of outer layer causes microscopic cracks so affects linearity of resistanc ...
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Compact Disc manufacturing



Compact disc manufacturing is the process by which commercial compact discs (CDs) are replicated in mass quantities using a master version created from a source recording. This may be either in audio form (CD-Audio) or data form (CD-ROM). This process is used in the mastering of read-only compact discs; CD-Rs, CD-RWs, and DVDs are made somewhat differently, though the methods are broadly similar. A CD can be used to store audio, video, and data in various standardized formats defined in the Rainbow Books. CDs are usually manufactured in a class 100 (ISO 5) or better clean room; they can usually be manufactured to quite strict manufacturing tolerances for only a few US cents per disk.CD mastering differs from burning, as the pits and lands of a mastered CD are moulded into a CD blank, rather than being 'burn marks' in a dye layer (in CD-Rs) or areas with changed physical characteristics (in CD-RWs). In addition, CD burners write data sequentially, while a CD pressing plant 'writes' the entire disk in one physical stamping operation.
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