Logarithmic scale
A logarithmic scale (or log scale) is a way of displaying numerical data over a very wide range of values in a compact way—typically the largest numbers in the data are hundreds or even thousands of times larger than the smallest numbers. Such a scale is nonlinear: the numbers 10 and 20, and 60 and 70, are not the same distance apart on a log scale. Rather, the numbers 10 and 100, and 60 and 600 are equally spaced. Thus moving a unit of distance along the scale means the number has been multiplied by 10 (or some other fixed factor). Often exponential growth curves are displayed on a log scale...
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Armstrong Flight Research Center
The historical logo of then Dryden Flight Research Center (before March 2014). The NASA Neil A. Armstrong Flight Research Center (AFRC) is an aeronautical research center operated by NASA. Its primary campus is located inside Edwards Air Force Base in California and is considered NASA's premier site for aeronautical research.[1] AFRC operates some of the most advanced aircraft in the world and is known for many aviation firsts, including critical support for the first crewed airplane to exceed the speed of sound in level flight with the Bell X-1,[2] highest speed ever recorded by a crewed, po...
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Compass rose
This article is about figure used to display the orientation of the cardinal directions. For the meteorological graphic, see Wind rose. For for the evenly spaced set of horizontal directions, see points of the compass. A compass rose, sometimes called a wind rose, rose of the winds or compass star, is a figure on a compass, map, nautical chart, or monument used to display the orientation of the cardinal directions (north, east, south, and west) and their intermediate points. It is also the term for the graduated markings found on the traditional magnetic compass. Today, a form of compass rose...
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Trade name
A trade name, trading name, or business name, is a pseudonym used by companies that do not operate under their registered company name. The term for this type of alternative name is a "fictitious" business name. Registering the fictitious name with a relevant government body is often required. In a number of countries, the phrase "trading as" (abbreviated to t/a) is used to designate a trade name. In the United States, the phrase "doing business as" (abbreviated to DBA, dba, d.b.a., or d/b/a) is used,[1] among others, such as assumed business name[2] or fictitious business name.[3] In Canada,...
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Commodity
In economics, a commodity is an economic good, usually a resource, that has full or substantial fungibility: that is, the market treats instances of the good as equivalent or nearly so with no regard to who produced them.[1][2][3] The price of a commodity good is typically determined as a function of its market as a whole: well-established physical commodities have actively traded spot and derivative markets. The wide availability of commodities typically leads to smaller profit margins and diminishes the importance of factors (such as brand name) other than price. Most commodities are raw ma...
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Flight
Flight or flying is the process by which an object moves through a space without contacting any planetary surface, either within an atmosphere (i.e. air flight or aviation) or through the vacuum of outer space (i.e. spaceflight). This can be achieved by generating aerodynamic lift associated with gliding or propulsive thrust, aerostatically using buoyancy, or by ballistic movement. Many things can fly, from animal aviators such as birds, bats and insects, to natural gliders/parachuters such as patagial animals, anemochorous seeds and ballistospores, to human inventions like aircraft (airplane...
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Neil Strauss
Neil Darrow Strauss, also known by the pen names Style and Chris Powles, is an American author, journalist and ghostwriter. He is best known for his book The Game: Penetrating the Secret Society of Pickup Artists, in which he describes his experiences in the seduction community in an effort to become a "pick-up artist." He is a contributing editor at Rolling Stone and also wrote regularly for The New York Times.[2] Early life and education[edit] After graduating from high school at the Latin School of Chicago in 1987,[3] Strauss attended Vassar College,[4][5] then transferred to[6] and subseq...
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Versioning file system
A versioning file system is any computer file system which allows a computer file to exist in several versions at the same time. Thus it is a form of revision control. Most common versioning file systems keep a number of old copies of the file. Some limit the number of changes per minute or per hour to avoid storing large numbers of trivial changes. Others instead take periodic snapshots whose contents can be accessed with similar semantics to normal file access. Similar technologies[edit] Backup[edit] A versioning file system is similar to a periodic backup, with several key differences. Bac...
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TENEX (operating system)
TENEX is an operating system developed in 1969 by BBN for the PDP-10, which later formed the basis for Digital Equipment Corporation's TOPS-20 operating system. Background[edit] In the 1960s, BBN was involved in a number of LISP-based artificial intelligence projects for DARPA, many of which had very large (for the era) memory requirements. One solution to this problem was to add paging software to the LISP language, allowing it to write out unused portions of memory to disk for later recall if needed. One such system had been developed for the PDP-1 at MIT by Daniel Murphy before he joined B...
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