"in the paper industry, lignin is seen as a residual product and usually burned. that's a pity, since just like petroleum, it can have many high quality uses if it can be properly separated from wood and the right chemical building blocks are extracted," said bert sels, a professor at the department...
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onto a moving paper tape. in alexander bain devised an electromagnetic printing telegraph machine. it used pulses of electricity created by rotating a dial over contact points to release and stop a type-wheel turned by weight-driven clockwork; a second clockwork mechanism rotated a drum covered with...
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thus, for a few dollars, you get an all-in-one solution for printing or copying jobs. laser printers are famous for their speed. however, even though brother hl-l cdw cannot handle ppm, as some brands on our list, its functionality is desirable. its print speed is modest ( ppm). it also has a -sheet paper...