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However, photochromic compounds are the necessary building blocks for light driven molecular motors and machines. [2] Upon irradiation with light, photoisomerization about double bonds in the molecule can lead to changes in the cis- or trans- configuration. [3] These photochromic molecules are being considered for a range of applications.
Sometimes, and particularly in the dye industry, the term irreversible photochromic is used to describe materials that undergo a permanent color change upon exposure to ultraviolet or visible light radiation. Because by definition photochromics are reversible, there is technically no such thing as an "irreversible photochromic"—this is loose ...
A tablet of lithographic limestone called a "litho stone" was coated with a light-sensitive surface composed of a thin layer of purified bitumen dissolved in benzene.A reversed halftone negative was hand colored according to the sketch and notes taken at the scene, then pressed against the coating and exposed to daylight through gel filters, causing the bitumen to harden in proportion to the ...
A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state.
Photochromic compounds based on spiropyrans, spirooxazines, and [2H]chromenes are being investigated because of their silver-free light-sensitive properties that could be used for optical recording data, including thin films, photoswitches (sensors that discern light of certain wavelength), light filters with modulated transmission and ...
The addition of a fourth light, the background light, makes for a four-point lighting setup. The background light is placed behind the subject(s), on a high grid, or low to the ground. Unlike the other three lights, which illuminate foreground elements like actors and props, it illuminates background elements, such as walls or outdoor scenery.
Photosensitive glass vase. Photosensitive glass, also called photostructurable glass (PSG) or photomachinable glass, is a glass in the lithium-silicate family of glasses onto which images can be etched using shortwave radiations, such as ultraviolet. [1]
ARAI has also developed a Simulation Lab, offering end to end solutions [buzzword] to the automotive industry as well as allied non-automotive industries. It is the first automotive engineering R&D institute in India to be awarded ISO 9001 Quality System Certification, ISO 14001 Environmental System Certification & OHSAS 18001 Occupational ...
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