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Sensors measuring the paper quality (online meters) are attached to a sensor platform that move across the web guided by the scanner beam. A typical crossing time for a sensor platform is 10–30 s (an 8 m web, 60 cm/s). The sensor platform scans across the paper web and continuously measures paper characteristics from edge to edge.
It is an environmental KPI parameter in paper making. Acidic paper made from wood-based pulp that still contains lignin will deteriorate over time by becoming brittle and turning yellow. [1] For document preservation, acid-free papers are therefore gaining popularity and have pH of 7 or slightly higher.
Technical reports used to be made available in print, but are now more commonly published electronically (typically in PDF), whether on the Internet or on the originating organization's intranet. Several schemes have been proposed or are in use to uniquely identify either an entire report series or an individual report:
Original file (1,275 × 1,650 pixels, file size: 96 KB, MIME type: application/pdf, 6 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
A circular filter paper is taken and the sample is deposited at the center of the paper. After drying the spot, the filter paper is tied horizontally on a Petri dish containing solvent, so that the wick of the paper is dipped in the solvent. The solvent rises through the wick and the components are separated into concentric rings.
A substitute check (also called an Image Replacement Document or IRD) [1] is a negotiable instrument that is a digital reproduction of an original paper check.As a negotiable payment instrument in the United States, a substitute check maintains the status of a "legal check" in lieu of the original paper check.