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UDD Crest
UDD may refer to: Science and technology *deuterium, Ultra-dense deuterium *Neutrons, which have quark configurations of udd, or up quark, up-down quark, down-down *Ultradisperse diamond, another name for Detonation nanodiamond *Urine-diverting dry toilet, Urine-diversion dehydration toilet *User-centered design, User driven development Others *Actuarial notation#Life tables, Uniform Distribution of Deaths, an assumption used in building actuarial life tables *Bermuda Dunes Airport *UDD, the station code for the Uddingston railway station in Uddingston, Scotland *United Front for Democracy Against Dictatorship, a political movement in Thailand *Universidad del Desarrollo private university in Chile *Up dharma Down, a Filipino band {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deuterium
Deuterium (or hydrogen-2, symbol or deuterium, also known as heavy hydrogen) is one of two Stable isotope ratio, stable isotopes of hydrogen (the other being Hydrogen atom, protium, or hydrogen-1). The atomic nucleus, nucleus of a deuterium atom, called a deuteron, contains one proton and one neutron, whereas the far more common protium has no neutrons in the nucleus. Deuterium has a natural abundance in Earth's oceans of about one atom of deuterium among all atoms of hydrogen (see heavy water). Thus deuterium accounts for approximately 0.0156% by number (0.0312% by mass) of all the naturally occurring hydrogen in the oceans, while protium accounts for more than 99.98%. The abundance of deuterium changes slightly from one kind of natural water to another (see Vienna Standard Mean Ocean Water). (Tritium is yet another hydrogen isotope, with two neutrons, that is far more rare and is radioactive.) The name ''deuterium'' is derived from the Greek , meaning "second", to denot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neutron
The neutron is a subatomic particle, symbol or , which has a neutral (not positive or negative) charge, and a mass slightly greater than that of a proton. Protons and neutrons constitute the nuclei of atoms. Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons. Their properties and interactions are described by nuclear physics. Protons and neutrons are not elementary particles; each is composed of three quarks. The chemical properties of an atom are mostly determined by the configuration of electrons that orbit the atom's heavy nucleus. The electron configuration is determined by the charge of the nucleus, which is determined by the number of protons, or atomic number. The number of neutrons is the neutron number. Neutrons do not affect the electron configuration, but the sum of atomic and neutron numbers is the mass of the nucleus. Atoms of a chemical element t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quark
A quark () is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. All commonly observable matter is composed of up quarks, down quarks and electrons. Owing to a phenomenon known as ''color confinement'', quarks are never found in isolation; they can be found only within hadrons, which include baryons (such as protons and neutrons) and mesons, or in quark–gluon plasmas. There is also the theoretical possibility of more exotic phases of quark matter. For this reason, much of what is known about quarks has been drawn from observations of hadrons. Quarks have various intrinsic properties, including electric charge, mass, color charge, and spin. They are the only elementary particles in the Standard Model of particle physics to experience all four fundamental interactions, also known as ''fundamental forces'' (electro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Up Quark
The up quark or u quark (symbol: u) is the lightest of all quarks, a type of elementary particle, and a significant constituent of matter. It, along with the down quark, forms the neutrons (one up quark, two down quarks) and protons (two up quarks, one down quark) of atomic nuclei. It is part of the first generation of matter, has an electric charge of + ''e'' and a bare mass of . Like all quarks, the up quark is an elementary fermion with spin , and experiences all four fundamental interactions: gravitation, electromagnetism, weak interactions, and strong interactions. The antiparticle of the up quark is the up antiquark (sometimes called ''antiup quark'' or simply ''antiup''), which differs from it only in that some of its properties, such as charge have equal magnitude but opposite sign. Its existence (along with that of the down and strange quarks) was postulated in 1964 by Murray Gell-Mann and George Zweig to explain the Eightfold Way classification scheme of had ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Down Quark
The down quark or d quark (symbol: d) is the second-lightest of all quarks, a type of elementary particle, and a major constituent of matter. Together with the up quark, it forms the neutrons (one up quark, two down quarks) and protons (two up quarks, one down quark) of atomic nuclei. It is part of the first generation of matter, has an electric charge of − ''e'' and a bare mass of . Like all quarks, the down quark is an elementary fermion with spin , and experiences all four fundamental interactions: gravitation, electromagnetism, weak interactions, and strong interactions. The antiparticle of the down quark is the down antiquark (sometimes called ''antidown quark'' or simply ''antidown''), which differs from it only in that some of its properties have equal magnitude but opposite sign. Its existence (along with that of the up and strange quarks) was postulated in 1964 by Murray Gell-Mann and George Zweig to explain the Eightfold Way classification scheme of hadro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Detonation Nanodiamond
Detonation nanodiamond (DND), also known as ultradispersed diamond (UDD), is diamond that originates from a detonation. When an oxygen-deficient explosive mixture of TNT/ RDX is detonated in a closed chamber, diamond particles with a diameter of c. 5 nm are formed at the front of the detonation wave in the span of several microseconds. Properties The diamond yield after detonation crucially depends on the synthesis condition and especially on the heat capacity of the cooling medium in the detonation chamber (water, air, CO2, etc.). The higher the cooling capacity, the larger the diamond yield, which can reach 90%. After the synthesis, diamond is extracted from the soot using high-temperature high-pressure (autoclave) boiling in acid for a long period (ca. 1–2 days). The boiling removes most of the metal contamination, originating from the chamber materials, and non-diamond carbon. Various measurements, including X-ray diffraction and high-resolution transmission electron mic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urine-diverting Dry Toilet
A urine-diverting dry toilet (UDDT) is a type of dry toilet with urine diversion that can be used to provide safe, affordable sanitation in a variety of contexts worldwide. The separate collection of feces and urine without any flush water has many advantages, such as odor-free operation and pathogen reduction by drying. While dried feces and urine harvested from UDDTs can be and routinely are used in agriculture (respectively, as a soil amendment and nutrient-rich fertilizer—this practice being known as reuse of excreta in agriculture), many UDDT installations do not apply any sort of recovery scheme. The UDDT is an example of a technology that can be used to achieve a sustainable sanitation system. This dry excreta management system (or "dry sanitation" system) is an alternative to pit latrines and flush toilets, especially where water is scarce, a connection to a sewer system and centralized wastewater treatment plant is not feasible or desired, fertilizer and soil conditio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
User-centered Design
User-centered design (UCD) or user-driven development (UDD) is a framework of process (not restricted to interfaces or technologies) in which usability goals, user characteristics, environment, tasks and workflow of a product, service or process are given extensive attention at each stage of the design process. These tests are conducted with/without actual users during each stage of the process from requirements, pre-production models and post production, completing a circle of proof back to and ensuring that "development proceeds with the user as the center of focus." Such testing is necessary as it is often very difficult for the designers of a product to understand intuitively the first-time users of their design experiences, and what each user's learning curve may look like. User-centered design is based on the understanding of a user, their demands, priorities and experiences and when used, is known to lead to an increased product usefulness and usability as it delivers sat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Actuarial Notation
Actuarial notation is a shorthand method to allow actuaries to record mathematical formulas that deal with interest rates and life tables. Traditional notation uses a halo system where symbols are placed as superscript or subscript before or after the main letter. Example notation using the halo system can be seen below. Various proposals have been made to adopt a linear system where all the notation would be on a single line without the use of superscripts or subscripts. Such a method would be useful for computing where representation of the halo system can be extremely difficult. However, a standard linear system has yet to emerge. Example notation Interest rates \,i is the annual effective interest rate, which is the "true" rate of interest over ''a year''. Thus if the annual interest rate is 12% then \,i = 0.12. \,i^ (pronounced "i ''upper'' m") is the nominal interest rate convertible m times a year, and is numerically equal to m times the effective rate of interest over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bermuda Dunes Airport
Bermuda Dunes Airport is a public use airport located in Bermuda Dunes, a town 13 nautical miles (15 mi, 24 km) east of the central business district of Palm Springs, a city in the Coachella Valley of Riverside County, California, United States. It is privately owned by Crown Aero, LLC. The airport is home to Desert West Aviation, a local flight school, as well as Coachella Valley Aviation, providing A&P/IA service for airplanes and helicopters. Facilities and aircraft Bermuda Dunes Airport covers an area of 105 acres (38 ha) at an elevation of 73 feet (22 m) above mean sea level. It has one runway designated 10/28 with an asphalt surface measuring 5,002 by 70 feet (1,525 x 21 m). For the 12-month period ending December 31, 2019, the airport had an average of 38 aircraft operations per day: 64% transient general aviation and 36% local general aviation. At that time there were 66 aircraft based at this airport: 56 single-engine, 5 multi-engine, no jet, and 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uddingston Railway Station
Uddingston railway station serves the town of Uddingston, South Lanarkshire, Scotland. ScotRail provides passenger services to this station on the Argyle Line and Shotts Line. History Overview The first Uddingston station, on the east side of the Glasgow Road bridge, was opened by the Clydesdale Junction Railway on 1 June 1849. In 1878, it was replaced by the second one immediately west of the bridge. The station was renamed Uddingston Central (1952–1962) to avoid confusion with the nearby Uddingston (NB) renamed . The latter closing in 1955, the former reverted to Uddingston in 1962.Butt (1995), page 237 Prior to the 2014 Whifflet Line electrification, Argyle Line services provided through links to Central Low Level via and then onwards to via northbound and to Motherwell southbound (alternate services continued to ). Access & facilities The building on Station Road, housing various public facilities, leads to Platform 1 (Glasgow-bound trains). A footbridge over the d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uddingston
Uddingston ( sco, Uddinstoun, gd, Baile Udain) is a small town in South Lanarkshire, Scotland. It is on the north side of the River Clyde, south-east of Glasgow city centre, and acts as a dormitory suburb for the city. Geography and boundaries Uddingston is located to the south-east of Glasgow city centre and approximately east of the Glasgow City Council boundary (ending at the former Glasgow Zoo at Broomhouse - part of Baillieston). It is bounded to the south-west by the River Clyde as it flows north-west towards Glasgow, separating Uddingston, along with some woodland, from the neighbouring towns of Blantyre to the south and Cambuslang to the west. As such, the Clyde Walkway and National Cycle Route 75 both traverse the town. The nearest settlement to Uddingston is the large village of Bothwell, almost contiguous to the south-east; the two main streets are apart. The village of Uddingston, which is contained exclusively within the boundaries of South Lanarkshire, hous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
