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QRP Operation
QRP may refer to: * QRP operation in amateur radio, low-power transmitting * Queen retinue pheromone, a type of honey bee pheromones * Queens Road Peckham railway station, National Rail code * Quadratic residuosity problem in mathematics * Questionable research practices, see Research ethics#Scientific integrity, research ethics {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Queen Retinue Pheromone
Queen retinue pheromones (QRP) are a type of honey bee pheromones, so-called because one of their behavioral effects is to attract a circle of bees (a “retinue”) around the queen. In older literature, the queen pheromone is called ''mandibular pheromone'' because some of its components were first identified from the mandibular glands of queens. ''Retinue pheromone'' may be more accurate because the chemical mix in the pheromone comes from several glands. The following compounds have been identified as present in the QRP, of which, only coniferyl alcohol is found in the mandibular glands. The combination of the five QMP compounds and the four compounds below help create the retinue attraction of worker bees around their queen. * Methyl oleate * Coniferyl alcohol * Hexadecan-1-ol * Alpha-linolenic acid References External links Semiochemicals of Genus ''Apis'' at pherobase.com Beekeeping Insect pheromones {{bee-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Queens Road Peckham Railway Station
Queens Road Peckham is an interchange station between the Windrush line of the London Overground and National Rail services operated by Southern, located in Peckham in the London Borough of Southwark. It is on the South London line, from , and is in Travelcard Zone 2. History The station opened with the line on 13 August 1866, and had two wooden side platforms and an intermediate centre platform to serve the third centre line. Until 1911 passenger trains ran to the East London line, stopping at . This link was re-instated on 9 December 2012 by London Overground. The present island platform dates from the 1970s which is on a viaduct with the line: there are 48 steps leading to it, and one block of platform buildings. Design The station has step free access from platform to street via a lift. A ramp is required for wheelchair access to and from the train. The station exits on to Queens Road in Peckham. Services Queens Road Peckham is on the Windrush line of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quadratic Residuosity Problem
The quadratic residuosity problem (QRP) in computational number theory is to decide, given integers a and N, whether a is a quadratic residue modulo N or not. Here N = p_1 p_2 for two unknown primes p_1 and p_2, and a is among the numbers which are not obviously quadratic non-residues (see below). The problem was first described by Gauss in his '' Disquisitiones Arithmeticae'' in 1801. This problem is believed to be computationally difficult. Several cryptographic methods rely on its hardness, see . An efficient algorithm for the quadratic residuosity problem immediately implies efficient algorithms for other number theoretic problems, such as deciding whether a composite N of unknown factorization is the product of 2 or 3 primes. Precise formulation Given integers a and T, a is said to be a ''quadratic residue modulo T'' if there exists an integer b such that :a \equiv b^2 \pmod T. Otherwise we say it is a quadratic non-residue. When T = p is a prime, it is customary t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |