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Screensaver
A screensaver (or screen saver) is a computer program that blanks the display screen or fills it with moving images or patterns when the computer has been idle for a designated time. The original purpose of screensavers was to prevent phosphor screen burn-in, burn-in on Cathode-ray tube, CRT or plasma display, plasma computer monitors (hence the name). Though most modern monitors are not susceptible to this issue (with the notable exception of OLED technology, which has individual pixels vulnerable to burnout), screensaver programs are still used for other purposes. Screensavers are often set up to offer a basic layer of computer security, security by requiring a password to re-access the device. Some screensaver programs also use otherwise-idle computer resources to do useful work, such as processing for volunteer computing projects. As well as computers, modern television operating systems, media players, and other digital entertainment systems may include optional screensavers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gnome-screensaver
Up until GNOME 3.5, GNOME Screensaver was the GNOME project's official screensaver, screen blanking and locking framework. With the release of GNOME 3.5.5, screen locking functionality became a function of GNOME Display Manager, GDM and GNOME Shell by default. History GNOME Screensaver continued to be used by the GNOME Fallback mode until GNOME Fallback was deprecated with the release of GNOME 3.8. GNOME Screensaver continues to be used in the GNOME Flashback session, a continuation of the GNOME Fallback mode. In October 2014, a member of the GNOME Flashback team requested maintainer-ship of GNOME Screensaver which would allow it to officially become part of the GNOME Flashback project. On some GNOME-based Linux distributions, GNOME Screensaver was used instead of the framework that is a part of XScreenSaver. On these systems, the screen savers themselves still came from the XScreenSaver collection, GNOME Screensaver just provided the interface. The GNOME Screensaver interface w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SETI@home
SETI@home ("SETI at home") is a project of the Berkeley SETI Research Center to analyze radio signals with the aim of Search for extraterrestrial intelligence, searching for signs of extraterrestrial intelligence. Until March 2020, it was run as an Internet-based public volunteer computing project that employed the Berkeley Open Infrastructure for Network Computing, BOINC software platform. It is hosted by the Space Sciences Laboratory at the University of California, Berkeley, and is one of many activities undertaken as part of the worldwide SETI effort. SETI@home software was released to the public on May 17, 1999, making it the third large-scale use of volunteer computing over the Internet for research purposes, after Great Internet Mersenne Prime Search (GIMPS) was launched in 1996 and distributed.net in 1997. Along with MilkyWay@home and Einstein@home, it is the third major computing project of this type that has the investigation of phenomena in interstellar space as its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Screen Burn-in
Screen burn-in, image burn-in, ghost image, or shadow image, is a permanent discoloration of areas on an electronic visual display such as a cathode-ray tube (CRT) in an older computer monitor or television set. It is caused by cumulative non-uniform use of the screen. Newer liquid-crystal displays (LCDs) may suffer from a phenomenon called image persistence instead, which is not permanent. One way to combat screen burn-in was the use of screensavers, which would move an image around to ensure that no one area of the screen remained illuminated for too long. Causes With phosphor-based electronic visual displays (i.e. CRT-type computer monitors, oscilloscope screens, and plasma displays), non-uniform use of specific areas, such as prolonged display of non-moving images (text or graphics), repetitive contents in gaming graphics, or certain broadcasts with tickers and flags, can create a permanent ghost-like image of these objects or otherwise degrade image quality. This is beca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Einstein@Home
Einstein@Home is a volunteer computing project that searches for signals from spinning neutron stars in data from gravitational-wave detectors, from large radio telescopes, and from a gamma-ray telescope. Neutron stars are detected by their pulsed radio and gamma-ray emission as radio and/or gamma-ray pulsars. They also might be observable as continuous gravitational wave sources if they are rapidly spinning and non-axisymmetrically deformed. The project was officially launched on 19 February 2005 as part of the American Physical Society's contribution to the World Year of Physics 2005 event. Einstein@Home searches data from the LIGO gravitational-wave detectors. The project conducts the most sensitive all-sky searches for continuous gravitational waves. While no such signal has yet been detected, the upper limits set by Einstein@Home analyses provide astrophysical constraints on the Galactic population of spinning neutron stars. Einstein@Home also searches radio telescope da ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Socha
John Socha-Leialoha (born 1958) is a software developer best known for creating Norton Commander, the first orthodox file manager. The original Norton Commander was written for DOS. Over the years, Socha's design for file management has been extended and cloned many times. John grew up in the woods of Wisconsin, earned a BS degree in Electrical Engineering from University of Wisconsin–Madison, and his PhD in Applied Physics from Cornell University. He now lives in Bellevue, Washington with his wife. His son, John Avi, is a graduate of the University of Washington. Starting in September 2010, John began working at Microsoft officially. Independent work In the early days of the IBM PC, John Socha wrote a column for the now defunct magazine ''Softalk'', where he published such programs as ScrnSave, KbdBuffer (extending the keyboard buffer), and Whereis (finding files on a hard disk). ''ScrnSave'' was the first screensaver ever created.John Socha also coined the term ''screen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ken Burns Effect
The Ken Burns effect is a type of panning and zooming effect used in film and video production from non-consecutive still images. The name derives from extensive use of the technique by American documentarian Ken Burns. This technique had also been used to produce animatics, simple animated mockups used to previsualize motion pictures, but Burns's name has become associated with the effect in much the same way as Alfred Hitchcock is associated with the dolly zoom. The feature enables a widely used technique of embedding still photographs in motion pictures, displayed with slow zooming and panning effects, and fading transitions between frames. Usage The technique is principally used when film or video material is not available. Action is given to still photographs by slowly zooming in on subjects of interest and panning from one subject to another. For example, in a photograph of a baseball team, one might slowly pan across the faces of the players and come to a rest on the pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cathode-ray Tube
A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms on an oscilloscope, a Film frame, frame of video on an Analog television, analog television set (TV), Digital imaging, digital raster graphics on a computer monitor, or other phenomena like radar targets. A CRT in a TV is commonly called a picture tube. CRTs have also been Williams tube, used as memory devices, in which case the screen is not intended to be visible to an observer. The term ''cathode ray'' was used to describe electron beams when they were first discovered, before it was understood that what was emitted from the cathode was a beam of electrons. In CRT TVs and computer monitors, the entire front area of the tube is scanned repeatedly and systematically in a fixed pattern called a raster scan, raster. In color devices, an image is produced by con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Image Persistence
Image persistence, or image retention, is a phenomenon in LCD and plasma displays where unwanted visual information is shown which corresponds to a previous state of the display. It is the flat-panel equivalent of screen burn-in. Unlike screen burn-in, the effects are usually temporary and often not visible without close inspection. Plasma displays experiencing severe image persistence can result in screen burn-in instead. Image persistence can occur as easily as having something remain unchanged on the screen in the same location for a duration of even 10 minutes, such as a web page or document. Minor cases of image persistence are generally only visible when looking at darker areas on the screen, and usually invisible to the eye during ordinary computer use. Cause Liquid crystals have a natural relaxed state. When a voltage is applied they rearrange themselves to block certain light waves. If left with the same voltage for an extended period of time (e.g. displaying a poin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cathode-ray Tube
A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms on an oscilloscope, a Film frame, frame of video on an Analog television, analog television set (TV), Digital imaging, digital raster graphics on a computer monitor, or other phenomena like radar targets. A CRT in a TV is commonly called a picture tube. CRTs have also been Williams tube, used as memory devices, in which case the screen is not intended to be visible to an observer. The term ''cathode ray'' was used to describe electron beams when they were first discovered, before it was understood that what was emitted from the cathode was a beam of electrons. In CRT TVs and computer monitors, the entire front area of the tube is scanned repeatedly and systematically in a fixed pattern called a raster scan, raster. In color devices, an image is produced by con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New York, New York
New York, often called New York City (NYC), is the List of United States cities by population, most populous city in the United States, located at the southern tip of New York State on New York Harbor, one of the world's largest natural harbors. The city comprises boroughs of New York City, five boroughs, each coextensive with List of counties in New York, a respective county. The city is the geographical and demographic center of both the Northeast megalopolis and the New York metropolitan area, the largest metropolitan area in the United States by both population and urban area. New York is a global city, global center of financial center, finance and Economy of New York City, commerce, Culture of New York City, culture, high technology, technology, The Entertainment Capital of the World, entertainment and Media in New York City, media, Academy, academics, and List of cities by scientific output, scientific output, the The arts, arts and fashion capital, fashion, and, as hom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stranger In A Strange Land
''Stranger in a Strange Land'' is a 1961 science fiction novel by the American author Robert A. Heinlein. It tells the story of Valentine Michael Smith, a human who comes to Earth in early adulthood after being born on the planet Mars and raised by Martians, and explores his interaction with and eventual transformation of Terran culture. The title "Stranger in a Strange Land" is a direct quotation from the King James Bible (taken from Exodus 2:22). The working title for the book was "A Martian Named Smith", which was also the name of the screenplay started by a character at the end of the novel. Heinlein's widow Virginia arranged to have the original unedited manuscript published in 1991, three years after Heinlein's death. Critics disagree about which version is superior. ''Stranger in a Strange Land'' won the 1962 Hugo Award for Best Novel and became the first science fiction novel to enter ''The New York Times Book Review''s best-seller list. In 2012, the Library of Cong ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
