Regular
The term regular can mean normal or in accordance with rules. It may refer to:
Organizations
Entertainment
Language
Mathematics
There is an extremely large number of unrelated notions of "regularity" in mathematics.
Algebra and number theory
(See also the geometry section for notions related to algebraic geometry.)
Regular polygon
In Euclidean geometry, a regular polygon is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length). Regular polygons may be convex or star. In the limit, a sequence of regular polygons with an increasing number of sides becomes a circle, if the perimeter is fixed, or a regular apeirogon, if the edge length is fixed.
General properties
These properties apply to all regular polygons, whether convex or star.
A regular n-sided polygon has rotational symmetry of order n.
All vertices of a regular polygon lie on a common circle (the circumscribed circle), i.e., they are concyclic points. That is, a regular polygon is a cyclic polygon.
Together with the property of equal-length sides, this implies that every regular polygon also has an inscribed circle or incircle that is tangent to every side at the midpoint. Thus a regular polygon is a tangential polygon.
A regular n-sided polygon can be constructed with compass and straightedge if and only if the odd prime factors of n are distinct Fermat primes. See constructible polygon.
Octane rating
Octane rating or octane number is a standard measure of the performance of an engine or aviation fuel. The higher the octane number, the more compression the fuel can withstand before detonating (igniting). In broad terms, fuels with a higher octane rating are used in high performance gasoline engines that require higher compression ratios. In contrast, fuels with lower octane numbers (but higher cetane numbers) are ideal for diesel engines, because diesel engines (also referred to as compression-ignition engines) do not compress the fuel but rather compress only air and then inject the fuel into the air heated up by compression. Gasoline engines rely on ignition of air and fuel compressed together as a mixture without ignition, which is then ignited at the end of the compression stroke using spark plugs. Therefore, high compressibility of the fuel matters mainly for gasoline engines. Use of gasoline with lower octane numbers may lead to the problem of engine knocking.
Principles
Dana, Jordan
Dana
Dana (ضانا) is a small village near the city of Tafilah, in central-western Jordan. It is situated on the edge of a large natural gorge, Wadi Dana and enjoys spectacular view over Wadi Araba.
Dana is about 500 years old, and preserves many aspects of Jordanian villages of the 19th century villages of Jordan. It hosts Dana nature reserve, one of Jordan's premier nature reserves with eco-tourism facilities.
Dana is home to several hotels including the RSCN's Guest House and a hotel run by and for the benefit of the local community known simply as the Dana Hotel (operated by Dana and Qadisiyah Local Community Cooperative ::جمعية أبناء ضانا والقادسية التعاونية http://www.facebook.com\dana.cooperative )
External links
Dana Hotel: http://www.facebook.com\dana.hotel.jordan Dana and Qadisiyah Local community cooperative:http://www.facebook.com\dana.cooperative
Coordinates: 30°39′N 35°36′E / 30.650°N 35.600°E / 30.650; 35.600
Dana (car)
Dana was the brand name of a car built by Hakon Olsen, who had created the Maskinfabriken Dana in Copenhagen, Denmark. The car had a Peugeot air-cooled 6 hp engine and was built between 1908 and 1914 with minor modifications. The end of its (limited) production has been attributed to different company priorities after the outbreak of World War I.
External link/Reference
Dana (Mirna)
Dana, proizvodnja in prodaja pijač, d. o. o. (English: Dana, the manufacture and sale of drinks) is a major Slovenian manufacturer of alcoholic and non-alcoholic beverages. It is located in the village of Mirna in southeastern Slovenia.
The company was established as a work organization in 1952. The brand Dana was registered in 1955. At first, the company produced only alcoholic beverages. After 1970, the program was expanded with the non-alcohol beverages. Since 2005, Dana has made the majority of profit with its high-quality natural mineral water Dana. In July 2012, the company was transformed from a joint-stock company to a limited liability company. It changed its name from Dana, tovarna rastlinskih specialitet in destilacija, d.d. (English: Dana, the plant specialties factory and distillation) to Dana, proizvodnja in prodaja pijač, d.o.o. (English: Dana, the manufacture and sale of drinks).
In 2000, Dana was ISO 9001 certified. In 2009, it obtained the International Food Standard (IFS) certificate.
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