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ISSN. 0731-1230. Photonics Spectra is a monthly business-to-business (B2B) magazine published for the engineers, scientists, and end users who develop, commercialize and buy photonic products. It provides both technical and applications information for all aspects of the global industry, integrating all segments of photonics: optics, lasers ...
PRISM is a code name for a program under which the United States National Security Agency (NSA) collects internet communications from various U.S. internet companies. [ 1][ 2][ 3] The program is also known by the SIGAD US-984XN. [ 4][ 5] PRISM collects stored internet communications based on demands made to internet companies such as Google LLC ...
The practice of mass surveillance in the United States dates back to wartime monitoring and censorship of international communications from, to, or which passed through the United States. After the First and Second World Wars, mass surveillance continued throughout the Cold War period, via programs such as the Black Chamber and Project SHAMROCK.
Camera lucida. A camera lucida is an optical device used as a drawing aid by artists and microscopists . The camera lucida projects an optical superimposition of the subject being viewed, onto the surface upon which the artist is drawing. The artist sees both scene and drawing surface simultaneously, as in a photographic double exposure.
Being optical telescopes, prism sights can focally compensate for a user's astigmatism. [ 12 ] [ 13 ] Prismatic sights are lighter and more compact than conventional telescopic sights, but are mostly fixed-powered in the low magnification ranges (usually 2×, 2.5×, 3× or more commonly 4×, occasionally 1× or 5× or more), suitable for ...
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The first is the prism method which uses a prism to direct the laser toward the interface between the coverglass and the media/cells at an incident angle sufficient to cause total internal reflection. This configuration has been applied to cellular microscopy for over 30 years but has never become a mainstream tool due to several limitations.
Optical Review. Optical Review is a bimonthly peer-reviewed scientific journal that was established in 1994 and is published by Springer Science+Business Media in partnership with the Optical Society of Japan. The editor-in-chief is Masahiro Yamaguchi. The journal publishes research and review papers in all subdisciplines of optical science and ...