Diaphragm (optics)

In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop for other uses of diaphragms in lenses). The diaphragm is placed in the light path of a lens or objective, and the size of the aperture regulates the amount of light that passes through the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system.

Most modern cameras use a type of adjustable diaphragm known as an iris diaphragm, and often referred to simply as an iris.

See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the diaphragm.

Iris diaphragms versus other types

A natural optical system that has a diaphragm and an aperture is the human eye. The iris is the diaphragm, and the opening in the iris of the eye (the pupil) is the aperture. An analogous dev in a photographic lens is called an iris diaphragm.

Iris (1987 film)

Iris is a 1987 Netherlands film directed by Mady Saks and starring Monique van de Ven.

Plot

A young woman, Iris, runs away to the big city on her eighteenth birthday. She moves in with an architect and decides to become a veterinarian. With an inheritance she buys an existing clinic in a backwoods town where Iris is leered at by the men, scorned by the women. Cruel jokes and gossip eventually lead to violence.A local thug breaks in her house while she is out. When she returns home late night, he attacks her, drag her to the wooden stairs, ties her hands, stretch her legs wide apart and ties to the railing of stairs and rapes her brutally.

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Iris (EP)

Iris is Miranda Sex Garden's second release, and first EP.

Track listing

Online and offline

The terms "online" and "offline" have specific meanings in regard to computer technology and telecommunications in which "online" indicates a state of connectivity, while "offline" indicates a disconnected state. Common vernacular extended from their computing and telecommunication meanings and refers specifically to an Internet connection. Lastly, in the area of human interaction and conversation, discussions taking place during a business meeting are "online", while issues that do not concern all participants of the meeting should be "taken offline" — continued outside of the meeting.

Definitions

In computer technology and telecommunication, online and offline are defined by Federal Standard 1037C. They are states or conditions of a "device or equipment" or of a "functional unit". To be considered online, one of the following may apply to a system: it is under the direct control of another device; it is under the direct control of the system with which it is associated; or it is available for immediate use on demand by the system without human intervention.

Online (song)

"Online" is a song co-written and performed by American country music artist Brad Paisley. It was released in July 2007 as the second single from the album 5th Gear. The single is Brad's ninth overall Number One single on the Billboard Hot Country Songs charts, as well as his fifth consecutive Number One. In addition, the song's music video won a Video of the Year award for Paisley at the 2007 Country Music Association awards. Paisley wrote this song with Kelley Lovelace and Chris DuBois.

Content

"Online" is a moderate up-tempo song whose lyrics satirize the online world, specifically MySpace. Here, the song's protagonist is a geek who lives at home with his parents, holds a job at the local Pizza Pitt pizzeria, and claims limited success in the dating world. Actually "five-foot-three and overweight", a fan of science fiction, and a mild asthmatic, the main character has an account on MySpace. There, he assumes a much more desirable personality: "Online, I'm out in Hollywood / I'm six-foot-five and I look damn good / I drive a Maserati / I'm a black-belt in karate / And I love a good glass of wine". Later in the song, he claims to live in Malibu, California, have a sexy, finely sculptured body, and pose for Calvin Klein Inc. and GQ. The fictitious alternate personalities make the geek claim that he is "so much cooler online". The album version of the song ends with a marching band playing the melody of the chorus, a reference to an earlier line where the protagonist claims to play tuba in a marching band.

Online (magazine)

Online was a magazine for information systems first published in 1977. The publisher Online, Inc. was founded the year before. The magazine was headquartered in Indianapolis, Indiana. In 2001, Information Today, Inc. acquired the assets of Online Inc. The first issue under Information Today, Inc. was published in January/February 2002. The magazine merged in 2013 with the magazine Searcher to form Online Searcher.

Marydee Ojala served as the editor of Online. The website contained selected full-text articles and news from each issue.

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