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Aperture (other)
The aperture of an optical system is the opening that limits the amount of light that can pass through. Aperture may also refer to: Science and technology *In anatomy, a number of apertures in the human body: ** Apertura nasalis posterior ** Apertura pelvis inferior ** Apertura pelvis minoris ** Apertura pelvis superior ** Apertura thoracis inferior ** Apertura thoracis superior **Lateral aperture (foramen of Luschka), an opening in each lateral extremity of the lateral recess of the fourth ventricle of the human brain **Median aperture (foramen of Magendie), which drains cerebrospinal fluid (CSF) from the fourth ventricle into the cisterna magna *Antenna aperture, a physical parameter of an antenna *Aperture (mollusc), the main opening in the shell of a gastropod or scaphopod (mollusc) *Aperture (botany), a weaker spot in the wall of a pollen grain *Numerical aperture is a parameter used to describe optical systems *Aperture (computer memory), a region of the physical address spac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture
In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. An optical system typically has many openings or structures that limit the ray bundles (ray bundles are also known as ''pencils'' of light). These structures may be the edge of a lens or mirror, or a ring or other fixture that holds an optical element in place, or may be a special element such as a diaphragm placed in the optical path to limit the light admitted by the system. In general, these structures are called stops, and the aperture stop is the stop that primarily determines the ray cone angle and brightness at the image point. In some contexts, especially in photography and astronomy, ''aperture'' refers to the diameter of the aperture stop rather than the physical stop or the opening itself. For example, in a telescope, the aperture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (botany)
Apertures are areas on the walls of a pollen grain, where the wall is thinner and/or softer. For germination it is necessary that the pollen tube can reach out from the inside of the pollen grain and transport the sperm to the egg deep down in the pistil Gynoecium (; ) is most commonly used as a collective term for the parts of a flower that produce ovules and ultimately develop into the fruit and seeds. The gynoecium is the innermost whorl of a flower; it consists of (one or more) ''pistils'' .... The apertures are the places where the pollen tube is able to break through the (elsewhere very tough) pollen wall. The number and configuration of apertures are often very exactly characteristic of different groups of plants. In Gymnosperms, pollen is usually sulcate, i.e. has a single aperture placed distally compared to the placement of the pollen grains in the meiotic tetrad. The largest clade of angiosperms, the Eudicots, usually have three apertures that run from the prox ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portal (series)
''Portal'' is a series of First-person (video games), first-person puzzle-platform video games developed by Valve Corporation, Valve. Set in the ''Half-Life (series), Half-Life'' universe, the two main games in the series, ''Portal (video game), Portal'' (2007) and ''Portal 2'' (2011), center on a woman, Chell (Portal), Chell, forced to undergo a series of tests within the Aperture Science Enrichment Center by a malicious artificial intelligence, GLaDOS, that controls the facility. Most of the tests involve using the "Aperture Science Handheld Portal Device" – nicknamed the portal gun – that creates a human-sized wormhole-like connection between two flat surfaces. The player-character or objects in the game world may move through portals while conserving their momentum. This allows complex "flinging" maneuvers to be used to cross wide gaps or perform other feats to reach the exit for each test chamber. A number of other mechanics, such as lasers, light bridges, tractor funnels ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture Foundation
Aperture Foundation is a nonprofit arts institution, founded in 1952 by Ansel Adams, Minor White, Barbara Morgan, Dorothea Lange, Nancy Newhall, Beaumont Newhall, Ernest Louie, Melton Ferris, and Dody Warren. Their vision was to create a forum for fine art photography, a new concept at the time. The first issue of the magazine ''Aperture'' was published in spring 1952 in San Francisco. In January 2011, Chris Boot joined the organization as its director. Boot has previously been an independent photobook publisher and worked with Magnum Photos and Phaidon Press. Sarah Meister, curator of photography at the Museum of Modern Art from 2009 to 2020, was named as Boot's replacement in the Executive Director position in January 2021, starting in May 2021. Books Aperture Foundation is a publisher of photography books, with more than 600 titles in print. Its book publication program began in 1965, with ''Edward Weston: The Flame of Recognition'', which became one of its best-selling ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (typography)
In typography, a counter is the area of a letter that is entirely or partially enclosed by a letter form or a symbol (the counter-space/the hole of). The stroke that creates such a space is known as a "bowl". Latin letters containing closed counters include A, B, D, O, P, Q, R, a, b, d, e, g, o, p, and q. Latin letters containing open counters include c, f, h, s etc. The digits 0, 4, 6, 8, and 9 also possess a counter. An aperture is the opening between an open counter and the outside of the letter. The lowercase ' g' has two typographic variants: the single-storey 'g' has one closed counter and one open counter (and hence one aperture); the double-storey '' has two closed counters. The digit ' 4' also has two typographic variants: the closed-top variant '4' has a closed counter, and an open-top (e.g. handwritten) '' has an open counter. Open and closed apertures Different typeface styles have different tendencies to use open or more closed apertures. This de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emily Blue
Emily Blue (born Emily Caroline Otnes on June 28, 1994; ) is an American singer-songwriter of Norwegian descent. She has both a solo career is the lead singer of Champaign-based indie rock band Tara Terra. Born and raised in Urbana, Illinois, she is now lives in Chicago and Nashville. Blue's career is characterized by sharp changes in musical style, and her releases fall into vastly different genre classifications, ranging from synth-pop to avant-garde and death metal. Life and career Emily Blue was born as Emily Caroline Otnes on June 28, 1994, in Urbana, Illinois. She wrote her first song when she was 13, and got motivated to become a songwriter. She says her mother was the guiding figure in her home, and that she inspired her by taking a powerful female role in the household. She me Colin Althaus and Joey Buttlar in the early 2010s and they joined Nick Soria and Céline Broussard to form Emily Otnes and the Weekdays, later renamed to Tara Terra. Otnes changed her name to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (magazine)
''Aperture'' magazine, based in New York City, is an international quarterly journal specializing in photography. Founded in 1952, ''Aperture'' magazine is the flagship publication of Aperture Foundation.http://www.aperture.org/ (official site). The headquarters of ''Aperture'' magazine and the Aperture Foundation and Gallery are at 547 West 27th Street, 4th floor, New York, NY 10001. Publication ''Aperture'' is published four times a year, in Spring, Summer, Fall, and Winter. It features photographs by established and emerging photographers, as well as artists experimenting with photo-related media. Each issue is usually themed and includes writings by critics, scholars, photography practitioners, and others involved in the field of photography. History 1952–1975 The magazine was founded in 1952 by a consortium of photographers and proponents of photography: Ansel Adams, Melton Ferris, Dorothea Lange, Ernest Louie, Barbara Morgan, Beaumont Newhall, Nancy Newhall, Do ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (software)
Aperture was an image organizer developed by Apple for the macOS operating system. It was first released in 2005 and was discontinued in 2015. The software handled a number of tasks common in post-production work such as importing and organizing image files, applying corrective adjustments, displaying slideshows, and printing photographs. Features of Aperture included non-destructive editing; organization of photographs by keyword, faces (using face recognition), and places (using GPS metadata embedded in image files); brushes for applying effects (such as dodge and burn, skin smoothing, and polarization); and exporting to Flickr, Facebook, SmugMug, and iCloud. On June 2, 2014, Apple announced Photos as a replacement for Aperture and iPhoto. Aperture 3.6, a final update adding compatibility with OS X Yosemite, was released on October 16, 2014. Aperture was discontinued and removed from sale on April 8, 2015. Mojave was the last version of macOS to officially support Aperture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (computer Memory)
In computing, an aperture is a portion of physical address space (i.e. physical memory) that is associated with a particular peripheral device or a memory unit. Apertures may reach external devices such as ROM or RAM chips, or internal memory on the CPU itself. Typically, a memory device attached to a computer accepts addresses starting at zero, and so a system with more than one such device would have ambiguous addressing. To resolve this, the memory logic will contain several aperture selectors, each containing a range selector and an interface to one of the memory devices. The set of selector address ranges of the apertures are disjoint. When the CPU presents a physical address within the range recognized by an aperture, the aperture unit routes the request (with the address remapped to a zero base) to the attached device. Thus, apertures form a layer of address translation below the level of the usual virtual-to-physical mapping. See also * Address bus * AGP aperture * Me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Numerical Aperture
In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light. By incorporating index of refraction in its definition, NA has the property that it is constant for a beam as it goes from one material to another, provided there is no refractive power at the interface. The exact definition of the term varies slightly between different areas of optics. Numerical aperture is commonly used in microscopy to describe the acceptance cone of an objective (and hence its light-gathering ability and resolution), and in fiber optics, in which it describes the range of angles within which light that is incident on the fiber will be transmitted along it. General optics In most areas of optics, and especially in microscopy, the numerical aperture of an optical system such as an objective lens is defined by :\mathrm = n \sin \theta, where is the index of refraction of the medium i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (mollusc)
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term ''aperture'' is used for the main opening in gastropod shells, scaphopod shells, and also for ''Nautilus'' and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a ''gape''. Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. As well as the aperture, some gastropod shells have additional openings in their shells for respiration; this is the case in some Fissurellidae (keyhole limpets) where the central smaller opening at the apex of the shell is called an orifice, and in the Haliotidae (abalones) where the row of respiratory openings in the shell are also called orifices. In gastropods In some prosobranch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apertura Nasalis Posterior
The choanae (singular choana), posterior nasal apertures or internal nostrils are two openings found at the back of the nasal passage between the nasal cavity and the throat in tetrapods, including humans and other mammals (as well as crocodilians and most skinks). They are considered one of the most important synapomorphies of tetrapodomorphs, that allowed the passage from water to land. In animals with secondary palates, they allow breathing when the mouth is closed. Janvier, Philippe (2004) "Wandering nostrils". ''Nature'', 432 (7013): 23–24. In tetrapods without secondary palates their function relates primarily to olfaction (sense of smell). The choanae are separated in two by the vomer. Boundaries A choana is the opening between the nasal cavity and the nasopharynx. It is therefore not a structure but a space bounded as follows: * anteriorly and inferiorly by the horizontal plate of palatine bone, * superiorly and posteriorly by the sphenoid bone * later ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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