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Dye penetrant inspection (DP), also called liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics, or ceramics).
Lines per inch (LPI) is a measurement of printing resolution. A line consists of halftones that is built up by physical ink dots made by the printer device to create different tones. Specifically LPI is a measure of how close together the lines in a halftone grid are. The quality of printer device or screen determines how high the LPI will be.
The images continue to be revisited periodically with new, cleaner, representations of the panoramas after being processed by increasingly sophisticated software packages. Examples of these include LPI's Apollo Surface Panorama page, [12] NASA's Johnson Space Center (JSC) 'Anniversary' Panoramas, [13] and Andy Saunders' Apollo Remastered. [14]
The images continue to be revisited periodically with new, cleaner, representations of the panoramas after being processed by increasingly sophisticated software packages. Examples of these include LPI's Apollo Surface Panorama page [17], NASA's Johnson Space Center (JSC) 'Anniversary' Panoramas [18], and Andy Saunders' Apollo Remastered [19].
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Depending on the detail of the images to be printed, the press operator will select an anilox roll with a higher or lower line screen. "Line screen" is the term used for the number of cells engraved on the anilox. Low line screen rolls (100-300 lpi) are used where a heavy layer of ink is desired, such as in heavy block lettering.
Liquid penetrant inspection of non-magnetic aircraft metal parts. Fluorescent penetrant inspection (FPI) is a type of dye penetrant inspection in which a fluorescent dye is applied to the surface of a non-porous material in order to detect defects that may compromise the integrity or quality of the part in question.
The Lunar and Planetary Institute (LPI) is a scientific research institute dedicated to study of the solar system, its formation, evolution, and current state.The Institute is part of the Universities Space Research Association [1] (USRA) and is supported by the Science Mission Directorate of the National Aeronautics and Space Administration [2] (NASA).