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A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. [2] The images may represent electrical waveforms on an oscilloscope , a frame of video on an analog television set (TV), digital raster graphics on a computer monitor , or ...
Image before (left) and after (right) adjustment with gray card (middle) Gray card from 100 to 0 in 30 steps. A gray card is a middle gray reference, typically used together with a reflective light meter , as a way to produce consistent image exposure and/or color in video production , film , and photography .
Fu Yuanchu's 1639 memorial to the throne made the case that trade between Fujian and Dutch Formosa had made the ban entirely unworkable. [15] The lifting of the sea ban coincided with the arrival of the first Spanish galleons from the Americas, creating a global trade link that would not be interrupted until the following century. [38]
The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.
A memory card can usually [b] immediately be re-used in a different memory-card-enabled device with no necessity for prior file transfers. Some dual-SIM mobile phones are equipped with a hybrid slot, where one of the two slots can be occupied by either a SIM card or a memory card. Some models, typically of higher end, are equipped with three ...
The current method for workers to form a union in a particular workplace in the United States is a sign-up, and then an election process. In that, a petition or an authorization card with the signatures of at least 30% of the employees requesting a union is submitted to the National Labor Relations Board (NLRB), who then verifies and orders a secret ballot election.