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High Quality Content by WIKIPEDIA articles! Rotordynamics is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures. It is commonly used to analyze the behavior of structures ranging from jet engines and steam turbines to auto engines and computer disk storage. At its most basic level rotordynamics is concerned with one or more mechanical structures (rotors) supported by bearings and influenced by internal phenomena that rotate around a single axis. The supporting structure is called a stator. As the speed of rotation increases the amplitude of vibration often passes through a maximum that is called a critical speed. This amplitude is commonly excited by unbalance of the rotating...

High Quality Content by WIKIPEDIA articles! Sandstone (sometimes known as arenite) is a sedimentary rock composed mainly of sand-sized minerals or rock grains.

High Quality Content by WIKIPEDIA articles! A skid row or skid road is a run-down or dilapidated urban area with a large, impoverished population. The term originally referred literally to a path along which working men skidded logs. Its current sense appears to have originated in the Pacific Northwest. Examples are Pioneer Square, Seattle, Washington,Old Town Chinatown, Portland, Oregon, Skid Row in Los Angeles, San Francisco`s Tenderloin District, the Downtown Eastside in Vancouver.

High Quality Content by WIKIPEDIA articles! The Resource Management Act (RMA) passed in 1991 in New Zealand is a significant, and at times, controversial Act of Parliament. The RMA promotes the sustainable management of natural and physical resources such as land, air and water. New Zealand`s Ministry for the Environment describes the RMA as New Zealand`s principal legislation for environmental management.

High Quality Content by WIKIPEDIA articles! "The Library of Babel" (Spanish: La biblioteca de Babel) is a short story by Argentine author and librarian Jorge Luis Borges (1899–1986), conceiving of a universe in the form of a vast library containing all possible 410-page books of a certain format.

High Quality Content by WIKIPEDIA articles! Otto Eduard Leopold, Prince of Bismarck, Duke of Lauenburg (1 April 1815 – 30 July 1898), simply known as Otto von Bismarck, was a Prussian-German statesman whose actions unified Germany, made it a major player in world affairs, and created a balance of power that kept Europe at peace after 1871.

High Quality Content by WIKIPEDIA articles! In vascular plants, the root is the organ of a plant that typically lies below the surface of the soil. This is not always the case, however, since a root can also be aerial (growing above the ground) or aerating (growing up above the ground or especially above water). Furthermore, a stem normally occurring below ground is not exceptional either (see rhizome). So, it is better to define root as a part of a plant body that bears no leaves, and therefore also lacks nodes. There are also important internal structural differences between stems and roots.

High Quality Content by WIKIPEDIA articles! The PZL TS-11 Iskra (English: Spark) is a Polish jet trainer aircraft, used by the air forces of Poland and India. It is notable as the main trainer plane of the Polish Army, the oldest jet plane still in service in Poland - and one of the most reliable.

High Quality Content by WIKIPEDIA articles! Saltern is a word with a number of differing (but interrelated) meanings. In English archaeology, a saltern is an area used for salt making, especially in the East Anglian fenlands.

High Quality Content by WIKIPEDIA articles! The Weaver Hall Museum and Workhouse, Northwich, Cheshire, records the social, cultural and industrial history of west Cheshire. It was formerly known as the Salt Museum, reflecting its earlier focus on the history of salt extraction, a local industry dating back to Roman times. The museum was renamed Weaver Hall Museum in 2010 as its remit now extends to cover the broader history of the area and also the history of the building itself as a former workhouse.

High Quality Content by WIKIPEDIA articles! In chess, a skewer (or X-ray attack) is an attack upon two pieces in a line and is similar to a pin. In fact, a skewer is sometimes described as a "reverse pin"; the difference is that in a skewer, the more valuable piece is in front of the piece of lesser or equal value. The opponent is compelled to move the more valuable piece to avoid its capture, thereby exposing the less valuable piece which can then be captured (see chess piece relative value). The long-range pieces (queen, rook, and bishop) can skewer.

High Quality Content by WIKIPEDIA articles! Promotion is a chess rule describing the transformation of a pawn that reaches its eighth rank into the player`s choice of a queen, knight, rook, or bishop of the same color (Just Burg 2003:16). The new piece replaces the pawn on the same square and is part of the move. Promotion is not limited to pieces that have already been captured (Schiller 2003:18–19). Every pawn that reaches its eighth rank must be promoted. Pawn promotion often decides the result of a chess endgame.

High Quality Content by WIKIPEDIA articles! Project Reality (abbreviated to PR) is an unfinished series of tactical First-person shooter video games which aim to create a realistic combat environment and place great emphasis on teamwork and cooperation. Project Reality includes two modifications for the computer game Battlefield 2 on the PC, a modification for the computer game ArmA 2, and an unreleased standalone sequel Project Reality 2 built on the C4 engine, still in pre-production development.

High Quality Content by WIKIPEDIA articles! Soil salinity and dryland salinity are two problems degrading the environment of Australia. Salinity is a concern in most states, but especially in the south-west of Western Australia.

High Quality Content by WIKIPEDIA articles! The Orchidaceae, commonly referred to as the orchid family, is a morphologically diverse and widespread family of monocots in the order Asparagales. Along with the Asteraceae, it is one of the two largest families of flowering plants, with between 21,950 and 26,049 currently accepted species, found in 880 genera. Selecting which of the two families is larger remains elusive because of the difficulties associated with putting hard species numbers on such enormous groups. Regardless, the number of orchid species equals more than twice the number of bird species, and about four times the number of mammal species. It also encompasses about 6–11% of all seed plants. The largest genera are...

High Quality Content by WIKIPEDIA articles! Profanity is a show of disrespect, or a desecration or debasement of someone or something. Profanity can take the form of words, expressions, gestures, or other social behaviors that are socially constructed or interpreted as insulting, rude, vulgar, obscene, desecrating, or other forms.

High Quality Content by WIKIPEDIA articles! Bottles made of PET are recycled to reuse the material out of which they are made and to reduce the amount of waste going to landfills.

High Quality Content by WIKIPEDIA articles! The resource curse (Paradox of Plenty) refers to the paradox that countries and regions with an abundance of natural resources, specifically point-source non-renewable resources like minerals and fuels, tend to have less economic growth and worse development outcomes than countries with fewer natural resources. This is hypothesized to happen for many different reasons, including a decline in the competitiveness of other economic sectors (caused by appreciation of the real exchange rate as resource revenues enter an economy), volatility of revenues from the natural resource sector due to exposure to global commodity market swings, government mismanagement of resources, or weak, ineffectual,...

High Quality Content by WIKIPEDIA articles! Thawte Consulting is a certificate authority (CA) for X.509 certificates. Thawte was founded in 1995 by Mark Shuttleworth in South Africa and is the second largest public CA on the Internet.