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U (other)
U, or u, is the twenty-first letter of the English alphabet. U may also refer to: Science Mathematics * \cup, union (set theory) * U-set, a set of uniqueness * U, the unitary group Chemistry * Uranium, symbol U, a chemical element * u, the Dalton (unit), a unified atomic mass unit to express atomic and molecular masses Astronomy * U, ultraviolet magnitude, in a UBV photometric system * U, an October 16 through 31 discovery in the provisional designation of a comet * U (trans-Neptunian object), a possible extremely distant trans-Neptunian object Computing * , a now-deprecated HTML element denoting underlined text * U, representing 1.75" as the minimal height of a rack unit * U, representing a 10x10x10cm CubeSat * U, universal Turing machine Biology * U, abbreviation for uracil * U, mitochondrial haplogroup U Other scientific uses * U, a common notation for potential energy * U, the middle of an edge joining a hexagonal and a square face of the Brillouin zone of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Union (set Theory)
In set theory, the union (denoted by ∪) of a collection of Set (mathematics), sets is the set of all element (set theory), elements in the collection. It is one of the fundamental operations through which sets can be combined and related to each other. A refers to a union of Zero, zero () sets and it is by definition equal to the empty set. For explanation of the symbols used in this article, refer to the List of mathematical symbols, table of mathematical symbols. Binary union The union of two sets ''A'' and ''B'' is the set of elements which are in ''A'', in ''B'', or in both ''A'' and ''B''. In set-builder notation, : A \cup B = \. For example, if ''A'' = and ''B'' = then ''A'' ∪ ''B'' = . A more elaborate example (involving two infinite sets) is: : ''A'' = : ''B'' = : A \cup B = \ As another example, the number 9 is ''not'' contained in the union of the set of prime numbers and the set of even numbers , because 9 is neither prime nor even. Sets cannot ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biological Activity
In pharmacology, biological activity or pharmacological activity describes the beneficial or adverse effects of a drug on living matter. When a drug is a complex chemical mixture, this activity is exerted by the substance's active ingredient or pharmacophore but can be modified by the other constituents. Among the various properties of chemical compounds, pharmacological/biological activity plays a crucial role since it suggests uses of the compounds in the medical applications. However, chemical compounds may show some adverse and toxic effects which may prevent their use in medical practice. Biological activity is usually measured by a bioassay and the activity is generally dosage-dependent, which is investigated via dose-response curves. Further, it is common to have effects ranging from beneficial to adverse for one substance when going from low to high doses. Activity depends critically on fulfillment of the ADME criteria. To be an effective drug, a compound not only ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sakurai Line
The is a railway line operated by West Japan Railway Company (JR West) in Nara Prefecture. It connects Nara Station, Nara on the Yamatoji Line to Takada Station (Nara), Takada on the Wakayama Line, with some services continuing on the Wakayama Line to ÅŒji Station (Nara), ÅŒji Station, and then to JR Namba Station, JR Namba on the Yamatoji Line. Starting on March 13, 2010, it is referred to by the nickname " in reference to the large number of ancient landmarks along the line's route. History The Osaka Railway Co. opened the Takada - Sakurai section in 1893, and the Nara Railway Co. opened the Sakurai - Kyobate section in 1898, extending the line to Nara the following year. In 1900 the Osaka Railway Co. merged with the Kansai Railway Co., and the Nara Railway Co. did likewise in 1905. In 1907 the Kansai Railway Co. was nationalised. CTC signalling was commissioned in 1979, and the line was electrified in 1980. Freight services ceased in 1983. Former connecting lines * Sakurai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JRW Kinki-U
JRW or Jrw could refer to: * Jackie Robinson West Little League, an all-black youth baseball team from Chicago, Illinois, U.S. * Jarosewichite, an arsenic-containing mineral found in Franklin, New Jersey, U.S. * Jurong West MRT station Jurong West MRT station is a future elevated Mass Rapid Transit (Singapore), Mass Rapid Transit (MRT) station on the Jurong Region Line in Jurong West, Singapore. History On 9 May 2018, LTA announced that Jurong West station would be part o ..., a future train station in the Jurong West neighborhood of Singapore; see List of Singapore MRT stations {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yurikamome Line Symbol
, formerly the , is an automated guideway transit service operated by ''Yurikamome, Inc.'' in Tokyo, Japan. It connects Shimbashi to Toyosu, via the artificial island of Odaiba, a market in which it competes with the Rinkai Line. The line is named after the black-headed gull (''yurikamome'' in Japanese), a common denizen of Tokyo Bay and the official metropolitan bird. History Before its 1995 opening, it was widely feared that the Yurikamome would end up as a multibillion-yen white elephant. The artificial island of Odaiba, which it serves, had been designed and constructed at prodigious expense before Japan's economic crash and, much like London's equally beleaguered Canary Wharf, there simply did not seem to be enough demand to support it. On 1 November 1995, the section between Shimbashi and Ariake opened, using a temporary Shimbashi station. In the first few months of operation, ridership hovered around 27,000 passengers per day, only a little less than the predicted 29,00 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yurikamome
, formerly the , is an automated guideway transit service operated by ''Yurikamome, Inc.'' in Tokyo, Japan. It connects Shimbashi Station, Shimbashi to Toyosu Station, Toyosu, via the artificial island of Odaiba, a market in which it competes with the Rinkai Line. The line is named after the Black-headed Gull, black-headed gull (''yurikamome'' in Japanese), a common denizen of Tokyo Bay and the official metropolitan bird. History Before its 1995 opening, it was widely feared that the Yurikamome would end up as a multibillion-yen white elephant. The artificial island of Odaiba, which it serves, had been designed and constructed at prodigious expense before Japan's economic crash and, much like London's equally beleaguered Canary Wharf, there simply did not seem to be enough demand to support it. On 1 November 1995, the section between Shimbashi Station, Shimbashi and Ariake Station (Tokyo), Ariake opened, using a temporary Shimbashi station. In the first few months of operation, ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
U (Los Angeles Railway)
U was a streetcar line in Los Angeles, California. Also referred to as the University Line, it provided service to the University of Southern California. History The Los Angeles Consolidated Electric Railway University Line dates to November 12, 1891, when the Los Angeles Consolidated Electric Railway began operating on tracks run down McClintock Avenue. The route initially terminated at the Los Angeles Santa Fe station. The line came under the ownership of Los Angeles Railway Company in 1895 and was rerouted in Downtown, terminating at Spring and West 2nd Street. In 1910, the route was combined with trackage built by the Los Angeles and Redondo Railway Company along South Central Avenue, creating a U-shaped route between Central Alameda and USC via Downtown ''Downtown'' is a term primarily used in American and Canadian English to refer to a city's sometimes commercial, cultural and often the historical, political, and geographic heart. It is often synonymous with its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transilien Line U
Transilien Line U, also known as "La Défense - La Verrière" or more often simply "ligne U", is a tangential commuter train link, which serves the western Paris region from La Défense. It links the Paris's business district of La Défense to La Verrière station, in the south-west of Ile-de-France. It is one of the two commuter train lines in the Transilien network that does not originate from a large Parisian station, along with the V. The line has 55,000 passengers per weekday in 2014. SNCF, 10/2014 Chronology *22 July 1988: A proposal is submitted to the ''[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
U Line
The U Line is a driverless, fully automatic, grade-separated light metro line in Uijeongbu, Seoul Capital Area, South Korea. The "U" is short for the city Uijeongbu. The line uses Véhicule Automatique Léger (VAL) 208 trains built by Siemens Transportation Systems. The system is very similar to the Lille Metro, Toulouse Metro and Rennes Metro in France. The line color is amber. The line is long on elevated track and offers a transfer to Line 1 at Hoeryong Station. Single rides cost 1,550 won. During rush hours trains come every 3 and a half minutes with trains coming every 6 to 10 minutes during all other hours. Trains are in service 19.5 hours a day, from 5 am until 12:30 am. From Balgok Station to Tapseok Station, the U Line will take riders 19 minutes and 54 seconds, versus a car, at 31 minutes 6 seconds, or a public bus, taking 40 minutes and 6 seconds. Two extensions are planned. After four and a half years of operating at a continual loss, a debt of 240 billion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermal Transmittance
Thermal transmittance is the rate of transfer of heat through matter. The thermal transmittance of a material (such as insulation or concrete) or an assembly (such as a wall or window) is expressed as a R-value (insulation)#U-factor.2FU-value, U-value. The R-value (insulation), thermal insulance of a structure is the reciprocal of its thermal transmittance. U-value Although the concept of U-value (or U-factor) is universal, U-values can be expressed in different units. In most countries, U-value is expressed in SI units, as watts per square metre-kelvin: :W/(m2⋅K) In the United States, U-value is expressed as British thermal units (Btu) per hour-square feet-degrees Fahrenheit: :Btu/(h⋅ft2⋅°F) Within this article, U-values are expressed in SI unless otherwise noted. To convert from SI to US customary values, divide by 5.678. Well-insulated parts of a building have a low thermal transmittance whereas poorly insulated parts of a building have a high thermal transmittance. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heat Transfer Coefficient
In thermodynamics, the heat transfer coefficient or film coefficient, or film effectiveness, is the Proportional (mathematics), proportionality constant between the heat flux and the thermodynamic driving force for the Heat transfer, flow of heat (i.e., the Temperature gradient, temperature difference, ). It is used to calculate heat transfer between components of a system; such as by convection between a fluid and a solid. The heat transfer coefficient has SI units in Watt, watts per square meter per kelvin (W/(m2K)). The overall heat transfer rate for combined modes is usually expressed in terms of an overall Thermal conduction, conductance or heat transfer coefficient, . Upon reaching a steady state of flow, the heat transfer rate is: :\dot=hA(T_2-T_1) where (in SI units): : \dot: Heat transfer rate (W) : h: Heat transfer coefficient (W/m2K) : A: surface area where the heat transfer takes place (m2) : T_2: temperature of the surrounding fluid (K) : T_1: temperature of the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micro-
''Micro'' (Greek letter μ, Mu (letter), mu, non-Italic type, italic) is a metric prefix, unit prefix in the metric system denoting a factor of one millionth (10−6). It comes from the Ancient Greek, Greek word (), meaning "small". It is the only International System of Units, SI prefix which uses a character not from the Latin alphabet. In Unicode, the symbol is represented by or the legacy symbol . When Greek alphabet, Greek characters are not available, the letter "u" is sometimes used instead of "μ". The prefix "mc" is also commonly used; for example, "mcg" denotes a microgram. Examples * Typical bacteria are 1 to 10 μm in diameter. * Hair's breadth, Human hair typically varies in diameter from 17 to 181 μm. * Eukaryote, Eukaryotic cells are typically 10 to 100 μm in diameter. Symbol encoding in character sets The official symbol for the metric prefix, SI prefix ''micro'' is a mu (letter), Greek lowercase mu (μ). For reasons stemming from its design, Unicode has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
