Ferro silicon calcium alloy is a composite alloy composed of silicon, calcium and iron. It is commonly used as deoxidizer and desulfurizer in steel smelting. It is applied to the production of
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Letterboxing is the practice of transferring film shot in a widescreen aspect ratio to standard-width video formats while preserving the film's original aspect ratio. The resulting videographic image has mattes (black bars) above and below it; these mattes are part of the image (i.e., of each frame of the video signal).