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Persol is an Italian luxury eyewear brand specializing in the manufacturing of sunglasses and optical frames. It is one of the oldest eyewear companies in the world and is owned by the Luxottica group. The name is derived from the Italian per il sole, meaning "for the sun". Formed in 1917 by Giuseppe Ratti, Persol originally catered to pilots ...
Mach number. The Mach number ( M or Ma ), often only Mach, ( / mɑːk /; German: [max]) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. [ 1][ 2] It is named after the Austrian physicist and philosopher Ernst Mach . where: M is the local Mach number, u is the ...
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The Handschiegl color process ( U.S. patent 1,303,836, U.S. patent 1,303,837, App: Nov 20, 1916, Iss: May 13, 1919) produced motion picture film prints with color artificially added to selected areas of the image. Aniline dyes were applied to a black-and-white print using gelatin imbibition matrices.
July 29, 2024 at 6:55 AM. The Agriculture Department on Monday announced plans to limit salmonella in poultry products in the U.S., a proposal that officials say will keep contaminated meat off ...
The Penrose process (also called Penrose mechanism) is theorised by Sir Roger Penrose as a means whereby energy can be extracted from a rotating black hole. [1] [2] [3] The process takes advantage of the ergosphere – a region of spacetime around the black hole dragged by its rotation faster than the speed of light, meaning that from the point of view of an outside observer any matter inside ...
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