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Wilkinson Equipment
Wilkinson may refer to: People * Wilkinson (surname), a surname (including a list of people with the name) Places in the United States * Wilkinson, Illinois * Wilkinson, Indiana, a town in Hancock County * Wilkinson, Minnesota * Wilkinson, Mississippi * Wilkinson, West Virginia * Wilkinson, Wisconsin, a town in Rusk County * Wilkinson County, Georgia * Wilkinson County, Mississippi * Wilkinson Heights, South Carolina * Wilkinson Lake, a lake in Minnesota * Wilkinson Station, Pantego, North Carolina * Wilkinson Township, Minnesota Electronics * Wilkinson analog-to-digital converter, a low-power method of converting analog signals to digital with a high degree of linearity * Wilkinson power divider, an RF signal splitter with special properties Enterprises * Wilko (formerly known as Wilkinson), a British do it yourself (DIY) and household goods store * Wilkinson Sword, a manufacturer of razor blades, and formerly of swords and motorbikes ** Wilkinson TMC, a Britis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilkinson (surname)
Wilkinson is an English surname of Normans, Norman origin. It is a variant of Williamson (surname), Williamson, derived from a variant of William, Wilkin, brought to the Anglo-Scottish border during the Norman conquest. At the time of the British Census of 1881, the relative frequency of the surname Wilkinson was highest in Westmorland (4.3 times the British average), followed by Yorkshire, County Durham, Lincolnshire, Cumberland, Northumberland, Lancashire, Cheshire and Nottinghamshire. People named Wilkinson include: A * A. H. Wilkinson (1875–1954), American politician * Adrienne Wilkinson, American actress * Alec Wilkinson (born 1952), American writer * Alex Wilkinson (born 1984), Australian soccer player * Alfred Robert Wilkinson VC (1896–1940), British soldier * Amanda Wilkinson (born 1982), Canadian country singer * Amandah Wilkinson (born 1987/8), New Zealand-Australian pop musician * Andrew Wilkinson (other), several people * Anne Wilkinson (poet) (1910–196 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analog-to-digital Converter
In electronics, an analog-to-digital converter (ADC, A/D, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal. An ADC may also provide an isolated measurement such as an electronic device that converts an analog input voltage or current to a digital number representing the magnitude of the voltage or current. Typically the digital output is a two's complement binary number that is proportional to the input, but there are other possibilities. There are several ADC architectures. Due to the complexity and the need for precisely matched components, all but the most specialized ADCs are implemented as integrated circuits (ICs). These typically take the form of metal–oxide–semiconductor (MOS) mixed-signal integrated circuit chips that integrate both analog and digital circuits. A digital-to-analog converter (DAC) performs the reverse function; it converts a digital signa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbonated Water
Carbonated water (also known as soda water, sparkling water, fizzy water, club soda, water with gas, in many places as mineral water, or especially in the United States as seltzer or seltzer water) is water containing dissolved carbon dioxide gas, either artificially injected under pressure or occurring due to natural geological processes. Carbonation causes small bubbles to form, giving the water an effervescent quality. Common forms include sparkling natural mineral water, club soda, and commercially-produced sparkling water. Club soda and sparkling mineral water and some other sparkling waters contain added or dissolved minerals such as potassium bicarbonate, sodium bicarbonate, sodium citrate, or potassium sulfate. These occur naturally in some mineral waters but are also commonly added artificially to manufactured waters to mimic a natural flavor profile and offset the acidity of introducing carbon dioxide gas. Various carbonated waters are sold in bottles and cans, with some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilkinson Microwave Anisotropy Probe
The Wilkinson Microwave Anisotropy Probe (WMAP), originally known as the Microwave Anisotropy Probe (MAP and Explorer 80), was a NASA spacecraft operating from 2001 to 2010 which measured temperature differences across the sky in the cosmic microwave background (CMB) – the radiant heat remaining from the Big Bang. Headed by Professor Charles L. Bennett of Johns Hopkins University, the mission was developed in a joint partnership between the NASA Goddard Space Flight Center and Princeton University. The WMAP spacecraft was launched on 30 June 2001 from Florida. The WMAP mission succeeded the COBE space mission and was the second medium-class (MIDEX) spacecraft in the NASA Explorer program. In 2003, MAP was renamed WMAP in honor of cosmologist David Todd Wilkinson (1935–2002), who had been a member of the mission's science team. After nine years of operations, WMAP was switched off in 2010, following the launch of the more advanced Planck spacecraft by European Space Agency ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GWR 3031 Class
The Dean Single, 3031 Class, or Achilles Class was a type of steam locomotive built by the British Great Western Railway between 1891 and 1899. They were designed by William Dean for passenger work. The first 30 members of the class were built as 2-2-2s of the 3001 Class. The first eight members of the class (numbers 3021-3028, built April–August 1891) were built as convertible broad gauge 2-2-2 locomotives, being converted to standard gauge in mid-1892, at the end of broad gauge running on the Great Western Railway. A further 22 were built in late 1891 and early 1892, this time as standard gauge engines. Although the 3001 class were fitted with larger boilers than earlier GWR 2-2-2 classes, the diameter of the boiler was constrained by its position between the driving wheels. Thus boiler capacity could only be increased by making the boiler longer, not wider, bringing the smokebox and cylinders in front of the leading axle. The extra weight of the larger boilers was bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilkinson's Polynomial
In numerical analysis, Wilkinson's polynomial is a specific polynomial which was used by James H. Wilkinson in 1963 to illustrate a difficulty when finding the root of a polynomial: the location of the roots can be very sensitive to perturbations in the coefficients of the polynomial. The polynomial is : w(x) = \prod_^ (x - i) = (x-1)(x-2) \cdots (x-20). Sometimes, the term ''Wilkinson's polynomial'' is also used to refer to some other polynomials appearing in Wilkinson's discussion. Background Wilkinson's polynomial arose in the study of algorithms for finding the roots of a polynomial : p(x) = \sum_^n c_i x^i. It is a natural question in numerical analysis to ask whether the problem of finding the roots of ''p'' from the coefficients ''c''''i'' is well-conditioned. That is, we hope that a small change in the coefficients will lead to a small change in the roots. Unfortunately, this is not the case here. The problem is ill-conditioned when the polynomial has a multiple ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilkinson's Catalyst
Wilkinson's catalyst is the common name for chloridotris(triphenylphosphine)rhodium(I), a coordination complex of rhodium with the formula hCl(PPh3)3(Ph = phenyl). It is a red-brown colored solid that is soluble in hydrocarbon solvents such as benzene, and more so in tetrahydrofuran or chlorinated solvents such as dichloromethane. The compound is widely used as a catalyst for hydrogenation of alkenes. It is named after chemist and Nobel laureate Sir Geoffrey Wilkinson, who first popularized its use. Historically, Wilkinson's catalyst has been a paradigm in catalytic studies leading to several advances in the field such as the implementation of some of the first heteronuclear magnetic resonance studies for its structural elucidation in solution (31P), parahydrogen-induced polarization spectroscopy to determine the nature of transient reactive species, or one of the first detailed kinetic investigation by Halpern to elucidate the mechanism. Furthermore, the catalytic and organome ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Guitar
An electric guitar is a guitar that requires external amplification in order to be heard at typical performance volumes, unlike a standard acoustic guitar (however combinations of the two - a semi-acoustic guitar and an electric acoustic guitar exist). It uses one or more pickups to convert the vibration of its strings into electrical signals, which ultimately are reproduced as sound by loudspeakers. The sound is sometimes shaped or electronically altered to achieve different timbres or tonal qualities on the amplifier settings or the knobs on the guitar from that of an acoustic guitar. Often, this is done through the use of effects such as reverb, distortion and "overdrive"; the latter is considered to be a key element of electric blues guitar music and jazz and rock guitar playing. Invented in 1932, the electric guitar was adopted by jazz guitar players, who wanted to play single-note guitar solos in large big band ensembles. Early proponents of the electric guitar on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilkinson TMC
The Wilkinson TMC is a British luxury touring motorcycle manufactured by the Wilkinson Sword company in Acton, London between 1911 and 1916, when production was stopped by the first World War. Development The first Wilkinsons motorcycle was built by the Wilkinson Sword company, which had diversified from making blades into a number of new products, including bicycles, typewriters and automobiles, as well as luxury motorcycles. The first 'Wilkinsons' were originally designed for military reconnaissance by P G Tacchi, who was granted a patent for the design in 1908. Demonstrated to the British military in the Summer of 1908, the Wilkinson motorcycle failed to impress the authorities, despite optional accessories including a Maxim machine gun mounted on the handlebars. Undaunted, the company continued development and exhibited a new version a year later at the Stanley Cycle & Motorcycle Show at the Agricultural Hall, Islington, London in 1909. This model had a 676 cc four-cy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilkinson Sword
Wilkinson Sword is a formerly British brand for Safety razor, razors and other personal care products sold in Europe, owned by the US company Edgewell Personal Care. The company was founded as a manufacturer of guns made in Shotley Bridge in County Durham, by Henry Nock in London in 1772. Besides guns, the company has also produced swords, bayonets and products such as typewriters, garden Pruning shears, shears, scissors and motorcycles. Gardening equipment is still made under the Wilkinson Sword name by E.P. Barrus under a licensing arrangement. Wilkinson Sword has manufactured its products in three UK locations over the years: in London (Chelsea, London, Chelsea and Acton, London, Acton), Cramlington in Northumberland, and Bridgend in Wales, where it made gardening tools. In 2000, the company closed its razor plant in the UK and consolidated production in Germany. In 2014, the company further moved most of its production to Czech Republic. History Henry Nock began trading a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilko (retailer)
Wilko Ltd., formerly Wilkinson Cash Stores (1930–1941) and Wilkinson Hardware Stores (1941–2014), is a British high-street retail chain which sells homewares and household goods. The company was founded in Leicester by James Kemsey Wilkinson in 1930, and remains in the ownership of the founding family. The founder's son, Tony Wilkinson, joined the company as a branch manager in 1960 and succeeded his father as chairman in 1972, retiring in June 2005. He was succeeded by his daughter, Lisa Wilkinson, and his niece, Karin Swann. In 2014, Karin Swann sold her family's 50% holding in the business to Lisa Wilkinson. Product range The Wilko product range concentrates on household essentials, including homewares, textiles, DIY, cleaning products, health and beauty lines, stationery, confectionery, pet products and kitchen and bathroom goods. Wilko sells seasonal lines such as gardening products in the summer, as well as Christmas decorations and an expanded toys and games range fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilkinson Power Divider
In the field of microwave engineering and circuit design, the Wilkinson Power Divider is a specific class of power divider circuit that can achieve isolation between the output ports while maintaining a matched condition on all ports. The Wilkinson design can also be used as a power combiner because it is made up of passive components and hence reciprocal. First published by Ernest J. Wilkinson in 1960, this circuit finds wide use in radio frequency communication systems utilizing multiple channels since the high degree of isolation between the output ports prevents crosstalk between the individual channels. It uses quarter wave transformers, which can be easily fabricated as quarter wave lines on printed circuit boards. It is also possible to use other forms of transmission line (e.g. coaxial cable) or lumped circuit elements (inductors and capacitors). Theory The scattering parameters for the common case of a 2-way equal-split Wilkinson power divider at the design fre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
