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O que (quem) é dye-forming coupler - definição

CHROMOGENIC FILM AND PAPER USED IN PHOTOGRAPHY

Color coupler; Color couplers; Dye couplers; Cyan coupler

Dye coupler

Dye coupler is present in chromogenic film and paper used in photography, primarily color photography. When a color developer reduces ionized (exposed) silver halide crystals, the developer is oxidized, and the oxidized molecules react with dye coupler molecules to form a dye in situ.

https://en.wikipedia.org/wiki/Dye_coupler

acoustic coupler

COMMUNICATION DEVICE

Accoustic coupler; Acoustic coupling; Acoustically coupled modem; Phone coupler

<hardware, communications> A device used to connect a modem to a telephone line via an ordinary handset. The acoustic coupler converts electrical signals from the modem to sound via a loudspeaker, against which the mouthpiece of a telephone handset is placed. The earpiece is placed against a microphone which converts sound to electrical signals which return to the modem. The handset is inserted into a sound-proof box containing the louspeaker and microphone to avoid interference from ambient noise. Acousitic couplers are now rarely used since most modems have a direct electrical connection to the telephone line. This avoids the signal degradation caused by conversion to and from audio. Direct connection is not always possible, and was actually illegal in the United Kingdom before {British Telecom} was privatised. BT's predecessor, the General Post Office, did not allow subscribers to connect their own equipment to the telephone line. (1994-11-08)

Forming (metalworking)

METALWORKING PROCESS OF FASHIONING PARTS AND OBJECTS THROUGH MECHANICAL DEFORMATION; THE WORKPIECE IS RESHAPED WITHOUT ADDING OR REMOVING MATERIAL

Metal forming; Metal Forming; Shaping (metalworking)

Forming, metal forming, is the metalworking process of fashioning metal parts and objects through mechanical deformation; the workpiece is reshaped without adding or removing material, and its mass remains unchanged. Forming operates on the materials science principle of plastic deformation, where the physical shape of a material is permanently deformed.

https://en.wikipedia.org/wiki/Forming_(metalworking)

Wikipédia

Dye coupler

Dye coupler is present in chromogenic film and paper used in photography, primarily color photography. When a color developer reduces ionized (exposed) silver halide crystals, the developer is oxidized, and the oxidized molecules react with dye coupler molecules to form a dye in situ. The silver image is removed by subsequent bleach and fix processes, so the final image will consist of the dye image.

Dye coupler technology has seen considerable advancement since the beginning of modern color photography. Major film and paper manufacturers have continually improved the stability of the image dye by improving couplers, particularly since the 1980s, so that archival properties of images are enhanced in newer color papers and films. Generally speaking, dye couplers for paper use are given more emphasis on the image permanence than those for film use, but some modern films (such as Fujichrome Provia films) use variants of couplers that were originally designed for paper use to further improve the image permanence.

https://en.wikipedia.org/wiki/Dye coupler