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WQRA
QRA may refer to: * Quantile regression averaging, in econometrics and forecasting * Quantitative risk assessment, an estimation of risk * Quaternary Research Association, associated with the ''Journal of Quaternary Science'' * Queensland Regional Airlines, a defunct Australian airline * Quick Reaction Alert, a NATO state of readiness in military aviation * Rand Airport (IATA airport code: QRA), South Africa * QRA locator, an obsolete geographic coordinate system * Kra (letter), the letter used in place of Q in some Inuit orthographies, also spelled Qra * Radio Q code for "What is the name of your vessel (or station)?" or "The name of my vessel (or station) is ____." {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantile Regression Averaging
Quantile Regression Averaging (QRA) is a forecast combination approach to the computation of prediction intervals. It involves applying quantile regression to the point forecasts of a small number of individual forecasting models or experts. It has been introduced in 2014 by Jakub Nowotarski and Rafał Weron and originally used for probabilistic forecasting of electricity prices and loads. Despite its simplicity it has been found to perform extremely well in practice - the top two performing teams in the ''price track'' of the Global Energy Forecasting Competition (GEFCom2014) used variants of QRA. Introduction The individual point forecasts are used as independent variables and the corresponding observed target variable as the dependent variable in a standard quantile regression setting. The Quantile Regression Averaging method yields an interval forecast of the target variable, but does not use the prediction intervals of the individual methods. One of the reasons for using poin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantitative Risk Assessment
Broadly speaking, a risk assessment is the combined effort of: # identifying and analyzing potential (future) events that may negatively impact individuals, assets, and/or the environment (i.e. hazard analysis); and # making judgments "on the tolerability of the risk on the basis of a risk analysis" while considering influencing factors (i.e. risk evaluation). Put in simpler terms, a risk assessment determines possible mishaps, their likelihood and consequences, and the tolerances for such events. The results of this process may be expressed in a quantitative or qualitative fashion. Risk assessment is an inherent part of a broader risk management strategy to help reduce any potential risk-related consequences. Need Individual risk assessment Risk assessment are done in individual cases, including patient and physician interactions. Individual judgements or assessments of risk may be affected by psychological, ideological, religious or otherwise subjective factors, which impac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quaternary Research Association
The Quaternary ( ) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). It follows the Neogene Period and spans from 2.58 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene (2.58 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today, although a third epoch, the Anthropocene, has been proposed but is not yet officially recognised by the ICS). The Quaternary Period is typically defined by the cyclic growth and decay of continental ice sheets related to the Milankovitch cycles and the associated climate and environmental changes that they caused. Research history In 1759 Giovanni Arduino proposed that the geological strata of northern Italy could be divided into four successive formations or "orders" ( it, quattro ordini). The term "quaternary" was introduced by Jules Desnoyer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Quaternary Science
The ''Journal of Quaternary Science'' is a peer-reviewed academic journal published on behalf of the Quaternary Research Association. It covers research on any aspect of quaternary science. The journal publishes predominantly research articles with two thematic issues published annually, although discussions and letters are occasionally published along with invited reviews. According to the '' Journal Citation Reports'', the journal has a 2012 impact factor of 2.939. See also * ''Boreas – An International Journal of Quaternary Research ''Boreas'' is a peer-reviewed academic journal that has been published on behalf of the Collegium Boreas since 1972. The journal covers all branches of quaternary research, including biological and non-biological aspects of the quaternary enviro ...'' References English-language journals Wiley-Blackwell academic journals Publications established in 1986 Quaternary science journals Academic journals associated with learned and pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Queensland Regional Airlines
Queensland Regional Airlines was an airline based in Cairns, Queensland, Australia. It was established and started operations in 2003 and operates passenger services, as well as contract and ''ad hoc'' charter and aircraft leasing. Its main base was Cairns International Airport Cairns Airport is an international airport in Cairns, Queensland, Australia. Formerly operated by the Cairns Port Authority, the airport was sold by the Queensland Government in December 2008 to a private consortium. It is the seventh busiest .... Flight International 12–18 April 2005 History The airline was launched by parent company, Australian Aviation Holdings (AAH), headquartered in Cairns, in 2002.Queensland Regional Airlines website Retrieved 22 December 2006 Services All Queensland Regional Airlines flights are now op ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quick Reaction Alert
Quick Reaction Alert (QRA) is state of readiness and ''modus operandi'' of air defence maintained at all hours of the day by NATO air forces. The United States usually refers to Quick Reaction Alert as 'Airspace Control Alert'. Some non-NATO countries also maintain QRA, either full-time or part-time. Operation QRA in the United Kingdom Pilots and engineers on QRA duty are at immediate readiness twenty-four hours a day fully dressed in the Crew Ready Room, which are next to the hangars (a hardened aircraft shelter known informally as ''Q-sheds'') which houses the interceptor aircraft, since 2007 the Eurofighter Typhoon. Pilots are on QRA duty around once or twice a month, each a twenty-four-hour shift. Engineers are on QRA duty three or four times a year, each for a twenty-four-hour a day shift for seven days at a time. Two Typhoon aircraft are on duty, along with a Voyager tanker at RAF Brize Norton in Oxfordshire; before 2014 this was carried out by a TriStar. C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rand Airport
Rand Airport is an airport in Germiston, South Africa. It was constructed in the 1920s as the main airport for Johannesburg, but the city outgrew it and replaced the airport with Palmietfontein Airport in 1948 (itself replaced by Jan Smuts International Airport in 1952). History Before World War II In 1917, Major Allister Miller landed on Germiston Golf Course and thought the area close by would be suitable as an airfield due to its location near to Johannesburg, the landmark of Victoria Lake and the well-drained land. But it would take until February 1929, for the three interested parties to agree for of land to be set aside for what was called the Germiston Public Aerodrome. The three parties were the Germiston Town Council, Elandsfontein Estate Company and the Rand Refinery. Later that year, the Germiston Town Council gained full control and further plans were developed for the aerodrome when Imperial Airways was thinking of adding South Africa to their flight schedules. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
QRA Locator
The QRA locator, also called QTH locator in some publications, is an obsolete geographic coordinate system used by amateur radio operators in Europe before the introduction of the Maidenhead Locator System. As a radio transmitter or receiver location system the QRA locator is considered defunct, but may be found in many older documents. History The QRA locator system in the 4-character format was introduced at a meeting of the VHF Working Group in The Hague in October 1959. The QRA locator was further developed with the addition of the fifth character at the Region 1 Conference in Malmö (1963). The QRA locator was officially adopted by IARU Region 1 in 1966 and was renamed "QTH-locator" a year later. Description QRA locator references consist of a string of two capital letters, two numerical digits and one lower case letter, e.g. FG32c. * The two capital letters mark an area, or ''square'', of two degrees longitude by one degree latitude, like the squares of Maidenhead Locator ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kra (letter)
Kra (Kʼ / ĸ) is a glyph formerly used to write the Kalaallisut language of Greenland and is now only found in Nunatsiavummiutut, a distinct Inuktitut dialect. It is visually similar to a Latin small capital letter '' K'', a Greek letter Kappa: '' κ, or a Cyrillic small letter Ka: к. It is used to denote the sound written as in the International Phonetic Alphabet (the voiceless uvular plosive). For collation purposes, it is therefore considered to be a type of '' q'', rather than a type of '' k'', and should sort near ''q''. Its Unicode code point for the lowercase form is . If this is unavailable, ''q'' is substituted. The letter can be capitalized as ''Kʼ'', but it is not encoded separately as a single letter because it is very similar to the Latin capital letter ''K'' followed by an apostrophe, preferably the modifier letter apostrophe, . In 1973, a spelling reform replaced kra in Greenlandic with the Latin small letter ''q'' (and its capital form, with the Latin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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