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apertures

См. также в других словарях:

  • apertures — ap·er·ture || æpə‚tjÊŠÉ™ n. opening; circular hole that controls the amount of light entering a camera …   English contemporary dictionary

  • Posterior nasal apertures — Lateral wall of nasal cavity. Dissection of the muscles of the palate …   Wikipedia

  • Aperture (botany) — Apertures are very small spots on the walls of a pollen, where the wall is thinner and/or softer. For germination it is necessary that the pollen tube can reach out from the inner of the pollen and transport the chromosomes to the egg deep down… …   Wikipedia

  • Gerber File — A Gerber File is a standard file format used by printed circuit board (PCB) fabrication houses that contains data necessary for computer controlled machines to draw exact patterns for circuit boards. These patterns are typically used to… …   Wikipedia

  • Sky-Watcher — Infobox Company company type = Corporation foundation = 1980 location city = Richmond, British Columbia location country = Canada industry = Technology company slogan = For people curious enough to look up and wonder. homepage = http://www.sky… …   Wikipedia

  • Transmission electron microscopy — A TEM image of the polio virus. The polio virus is 30 nm in size.[1] Transmission electron microscopy (TEM) is a microscopy technique whereby a beam of electrons is transmitted through an ultra thin specimen, interacting with the specimen as it… …   Wikipedia

  • Superconducting Radio Frequency — (SRF) science and technology involves the application of electrical superconductors to radio frequency devices. The ultra low electrical loss of the superconductor yields RF resonators with extremely high quality factors, or Q . For example, it… …   Wikipedia

  • optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …   Universalium

  • F-number — In optics, the f number (sometimes called focal ratio, f ratio, or relative aperture [Smith, Warren Modern Lens Design 2005 McGraw Hill] ) of an optical system expresses the diameter of the entrance pupil in terms of the focal length of the lens; …   Wikipedia

  • Digital single-lens reflex camera — Nikon D700 full frame (FX) digital SLR camera …   Wikipedia

  • Lens speed — refers to the maximum aperture diameter, or minimum f number, of a photographic lens. A lens with a larger maximum aperture (that is, a smaller minimum f number) is a fast lens because it delivers more light intensity (illuminance) to the focal… …   Wikipedia

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