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18O (other)
18O or ''variant'', may refer to: * Oxygen 18 (18O), an isotope of oxygen with atomic mass number 18 (8 protons + 10 neutrons) * 2019 Catalan general strike (''18-O'') * 18º, a way to write the ordinal number 18th (eighteenth) See also * δ18O * * * O-18 (other) and O18 * 18 (other) * O (other) O is the fifteenth letter of the modern Latin alphabet. O may also refer to: Letters * Օ օ, (Unicode: U+0555, U+0585) a letter in the Armenian alphabet * Ο ο, Omicron, (Greek), a letter in the Greek alphabet * O (Cyrillic), a letter of t ... * 180 (other) (one-eight-zero; 180) * I80 (other) (i-eight-zero; I80) * l80 (other) (L-eight-zero; l80) {{Letter–number combination disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxygen 18
Oxygen-18 (, Ω) is a natural, stable isotope of oxygen and one of the environmental isotopes. is an important precursor for the production of fluorodeoxyglucose (FDG) used in positron emission tomography (PET). Generally, in the radiopharmaceutical industry, enriched water () is bombarded with hydrogen ions in either a cyclotron or linear accelerator, creating fluorine-18. This is then synthesized into FDG and injected into a patient. It can also be used to make an extremely heavy version of water when combined with tritium (hydrogen-3): or . This compound has a density almost 30% greater than that of natural water. The accurate measurements of rely on proper procedures of analysis, sample preparation and storage. Paleoclimatology In ice cores, mainly Arctic and Antarctic, the ratio of to (known as δ) can be used to determine the temperature of precipitation through time. Assuming that atmospheric circulation and elevation has not changed significantly over the poles, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2019 Catalan General Strike
The 2019 Catalan general strike, also known as 18-O, was a general strike held by Catalan separatists on 18 October 2019, on the fifth night of the 2019 protests following the verdict against Catalonia independence leaders for their participation in a referendum on independence two years earlier. Strikes for political reasons are not allowed by Spanish law. The main labor unions in the country, UGT and CCOO, did not participate. See also * Catalan autonomist campaign of 1918-1919 References Further reading * * * * * * * External links {{DEFAULTSORT:Catalan general strike, 2019 General strike 2019 labor disputes and strikes 2019 protests General strike, 2019 General strikes October 2019 events in Spain Protests in Catalonia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
18th
18 (eighteen) is the natural number following 17 and preceding 19. In mathematics * Eighteen is a composite number, its divisors being 1, 2, 3, 6 and 9. Three of these divisors (3, 6 and 9) add up to 18, hence 18 is a semiperfect number. Eighteen is the first inverted square-prime of the form ''p''·''q''2. * In base ten, it is a Harshad number. * It is an abundant number, as the sum of its proper divisors is greater than itself (1+2+3+6+9 = 21). It is known to be a solitary number, despite not being coprime to this sum. * It is the number of one-sided pentominoes. * It is the only number where the sum of its written digits in base 10 (1+8 = 9) is equal to half of itself (18/2 = 9). * It is a Fine number. In science Chemistry * Eighteen is the atomic number of argon. * Group 18 of the periodic table is called the noble gases. * The 18-electron rule is a rule of thumb in transition metal chemistry for characterising and predicting the stability of metal complexes. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
δ18O
In geochemistry, paleoclimatology and paleoceanography ''δ''18O or delta-O-18 is a measure of the ratio of stable isotopes oxygen-18 (18O) and oxygen-16 (16O). It is commonly used as a measure of the temperature of precipitation, as a measure of groundwater/mineral interactions, and as an indicator of processes that show isotopic fractionation, like methanogenesis. In paleosciences, 18O:16O data from corals, foraminifera and ice cores are used as a proxy for temperature. The definition is, in "per mil" (‰, parts per thousand): :\delta \ce = \left( \frac - 1 \right) \times 1000 ‰ where the standard has a known isotopic composition, such as Vienna Standard Mean Ocean Water (VSMOW). The fractionation can arise from kinetic, equilibrium, or mass-independent fractionation. Mechanism Foraminifera shells are composed of calcium carbonate (CaCO3) and are found in many common geological environments. The ratio of 18O to 16O in the shell is used to indirectly determine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
O-18 (other)
O18 or O-18 may refer to: Places Airports * Hanford Municipal Airport, in California, United States; formerly assigned FAA LID O18 * Buzzards Roost Airport (FAA LID O18), Inola, Oklahoma, USA; see List of airports in Oklahoma Rail stations * Tondabayashi Station (station code O18), Tondabayashi, Osaka Prefecture, Japan * Xinzhuang metro station (station code O18), Xinzhuang District, New Taipei, Taiwan Literature * Naos (hieroglyph) (Gardiner code O18), an Egyptian hieroglyphic representing a shrine * Minuscule 442 (Soden code O18), a Greek New Testament minuscule manuscript * Minuscule 441 (Soden code O18), a Greek New Testament minuscule manuscript Other uses * Curtiss O-18 Falcon, an observation aircraft of the United States Army Air Corps * Oxygen-18, an isotope of oxygen * Delta-O-18, a measure of the ratio of stable isotopes 18O:16O (oxygen-18:oxygen-16) * MSC(O)-18, minesweeper built for the United States Navy during World War II * over age 18 (O18), an age grouping, s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
18 (other)
Eighteen or 18 may refer to: * 18 (number), the natural number following 17 and preceding 19 * one of the years 18 BC, AD 18, 1918, 2018 Film, television and entertainment * ''18'' (film), a 1993 Taiwanese experimental film based on the short story ''God's Dice'' * ''Eighteen'' (film), a 2005 Canadian dramatic feature film * 18 (British Board of Film Classification), a film rating in the United Kingdom, also used in Ireland by the Irish Film Classification Office * 18 (''Dragon Ball''), a character in the ''Dragon Ball'' franchise * "Eighteen", a 2006 episode of the animated television series ''12 oz. Mouse'' Music Albums * ''18'' (Moby album), 2002 * ''18'' (Nana Kitade album), 2005 * '' 18...'', 2009 debut album by G.E.M. Songs * "18" (5 Seconds of Summer song), from their 2014 eponymous debut album * "18" (One Direction song), from their 2014 studio album ''Four'' * "18", by Anarbor from their 2013 studio album '' Burnout'' * "I'm Eighteen", by Alice Cooper commonly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
O (other)
O is the fifteenth letter of the modern Latin alphabet. O may also refer to: Letters * Օ օ, (Unicode: U+0555, U+0585) a letter in the Armenian alphabet * Ο ο, Omicron, (Greek), a letter in the Greek alphabet * O (Cyrillic), a letter of the Cyrillic alphabet * O (kana), a romanization of the kana (お and オ) in Japanese writing * ㅇ, a consonant in Hangul, the Korean alphabet * ဝ, a consonant in Burmese script * /o/, close-mid back rounded vowel in the International Phonetic Alphabet Vo (letter) Arts and entertainment Film and television * ''O'' (film), 2001 film starring Josh Hartnett, Mekhi Phifer and Julia Stiles Literature * '' O: A Presidential Novel'', anonymous novel published in 2011 * O, fictional planet that is the setting of several short stories by science fiction author Ursula K. Le Guin * O, fictional character from the French erotic novel '' Story of O'' * '' "O" Is for Outlaw'', the fifteenth novel in Sue Grafton's "Alphabet mystery" series, publi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
180 (other)
180 is a year. 180 may also refer to: *180 (number) * ''180'' (video game), a 1986 darts video game * ''180'' (2011 American film) * ''180'' (2011 Indian film) * ''180'' (album), a 2013 album by Palma Violets * ''One Eighty'', a 1980 album by Ambrosia *''The 180'', a 2013–2017 Canadian radio talk show *U-turn or 180 *180, a trick in extreme sports in which a rider rotates half a turn while airborne and lands See also * 180° (other) * List of highways numbered 180 *''Flight 180,'' an alternate name for Final Destination (2000) * * 18O (other) 18O or ''variant'', may refer to: * Oxygen 18 (18O), an isotope of oxygen with atomic mass number 18 (8 protons + 10 neutrons) * 2019 Catalan general strike (''18-O'') * 18º, a way to write the ordinal number 18th (eighteenth) See also * δ18O ... (one-eight-o; 18o) * l80 (other) (L-eight-zero; l80) * I80 (other) (i-eight-zero; I80) {{numberdis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
I80 (other)
I80 or ''variation'', may refer to: * Interstate 80 (I-80), a U.S. highway * Aérotrain The Aérotrain was an experimental Tracked Air Cushion Vehicle (TACV), or hovertrain, developed in France from 1965 to 1977 under the engineering leadership of Jean Bertin (1917–1975) – and intended to bring the French rail network to the c ... I80, a hovertrain * Cascade Kasperwing I-80, an ultralight motorglider * , a WWII British Royal Navy ''Clemson''-class destroyer See also * Watt/I-80 station, Sacramento, California * 80i {{dab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
