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Plutonium
Plutonium is a chemical element; it has symbol Pu and atomic number 94. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states. It reacts with carbon, halogens, nitrogen, silicon, and hydrogen. When exposed to moist air, it forms oxides and hydrides that can expand the sample up to 70% in volume, which in turn flake off as a powder that is pyrophoric. It is radioactive and can accumulate in bones, which makes the handling of plutonium dangerous. Plutonium was first synthesized and isolated in late 1940 and early 1941, by deuteron bombardment of uranium-238 in the cyclotron at the University of California, Berkeley. First, neptunium-238 (half-life 2.1 days) was synthesized, which then beta-decayed to form the new element with atomic number 94 and atomic weight 238 (half-life 88 years). Since uranium had been named after the planet Uranus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1994
The year 1994 was designated as the " International Year of the Family" and the "International Year of Sport and the Olympic Ideal" by the United Nations. In the Line Islands and Phoenix Islands of Kiribati, 1994 had only 364 days, omitting December 31. This was due to an adjustment of the International Date Line by the Kiribati government to bring all of its territories into the same calendar day. Events January * January 1 ** The North American Free Trade Agreement (NAFTA) is established. ** Beginning of the Zapatista uprising in Mexico. * January 8 – '' Soyuz TM-18'': Valeri Polyakov begins his 437.7-day orbit of the Earth, eventually setting the world record for days spent in orbit. * January 11 – The Irish government announces the end of a 15-year broadcasting ban on the Provisional Irish Republican Army and its political arm Sinn Féin. * January 14 – U.S. President Bill Clinton and Russian President Boris Yeltsin sign the Kremlin accords, which stop t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
94 (number)
94 (ninety-four) is the natural number following 93 and preceding 95. In mathematics 94 is: *the twenty-ninth distinct semiprime and the fourteenth of the form (2.q). *the ninth composite number in the 43-aliquot tree. The aliquot sum of 94 is 50 within the aliquot sequence; (94, 50, 43, 1,0). *the second number in the third triplet of three consecutive distinct semiprimes, 93, 94 and 95 *a 17- gonal number and a nontotient. *an Erdős–Woods number, since it is possible to find sequences of 94 consecutive integers such that each inner member shares a factor with either the first or the last member. *a Smith number in decimal. In computing The ASCII character set (and, more generally, ISO 646) contains exactly 94 graphic non- whitespace characters, which form a contiguous range of code points. These codes ( 0x21–0x7E, as corresponding high bit set bytes 0xA1–0xFE) also used in various multi-byte encoding schemes for languages of East Asia, such as ISO 2022, EUC ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
94 Aurora
94 Aurora is one of the largest main-belt asteroids. With an albedo of only 0.04, it is darker than soot, and has a primitive composition consisting of carbonaceous material. It was discovered by J. C. Watson on September 6, 1867, in Ann Arbor, and named after Aurora, the Roman goddess of the dawn. This asteroid is orbiting the Sun with a period of 5.62 years and a relatively low eccentricity of 0.092. It is spinning with a rotation period of 7.22 hours. Observations of an occultation using nine chords indicate an oval outline of 225×173 km. The asteroid's pole of rotation lies just 4–16° away from the plane of the ecliptic. Notes References External links * * Background asteroids Aurora Aurora An aurora ( aurorae or auroras), also commonly known as the northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in Earth's sky, predominantly observed in high-latitude regions (around the Arc . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
94 BC
__NOTOC__ Year 94 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Caldus and Ahenobarbus (or, less frequently, year 660 ''Ab urbe condita'') and the Third Year of Taishi. Events By place Anatolia * Approximate date – Nicomedes IV succeeds his father Nicomedes III as king of Bithynia. India * The Shakas start to control northwest India. Roman Republic * Consuls: Gaius Coelius Caldus and Lucius Domitius Ahenobarbus. * The first (failed) attempt to open a Latin rhetorical school. * Lucius Cornelius Sulla is elected ''praetor urbanus''. Births * Zhao of Han, Chinese emperor (d. 74 BC __NOTOC__ Year 74 BC was a year of the Roman calendar, pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Lucullus and Cotta (or, less frequently, year 680 ''Ab urbe condita''). The denomination 74 BC for this ye ...) Deaths References {{DEFAULTSORT:94 Bc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AD 94
__NOTOC__ AD 94 ( XCIV) was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Calpurnius and Magius (or, less frequently, year 847 ''Ab urbe condita''). The denomination AD 94 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Emperor Domitian rebuilds and rededicates the Curia Julia (meeting place of the Roman Senate), which had burned down in AD 64. * Domitian banishes all Stoic philosophers from Rome. Asia * The Chinese General Ban Chao completes his conquest of the Tarim Basin by taking Yānqi, which is located on the strategic Silk Road. By topic Literature * The Roman poet Publius Papinius Statius retires to Naples from Rome (approximate date). Births * An of Han, Chinese emperor (d. 125 125 may refer to: *125 (number), a natural number *AD 125, a year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2094
In contemporary history, the third millennium is the current millennium in the ''Anno Domini'' or Common Era, under the Gregorian calendar. It began on 1 January 2001 ( MMI) and will end on 31 December 3000 ( MMM), spanning the 21st to 30th centuries. Ongoing futures studies seek to understand what will likely continue and what could plausibly change in this period and beyond. Predictions and forecasts not included on this timeline * Climate change * Extinction * List of dates predicted for apocalyptic events * List of future astronomical events ** List of lunar eclipses in the 21st century ** List of solar eclipses in the 21st century * List of time capsules * Near future centennial (bi, tri, etc.) events. * Near future in fiction * Predictions and claims for the Second Coming * Projections of population growth ** Representative Concentration Pathway ** Shared Socioeconomic Pathways 21st century 2000s * See: 2000 * 2001 * 2002 * 2003 * 2004 * 2005 * 2006 * 2007 * 200 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saab 94
The Saab Sonett is an automobile manufactured by Swedish automaker Saab between 1955 and 1957 and again between 1966 and 1974. The Sonett share its engines and other mechanical components with the Saab 93, 95 and 96 of the same era. It was mainly intended for the lucrative American export market and was only offered intermittently in the Swedish domestic market for the 1968 and 1972 model years. The first prototype, now known as the Sonett I, is a two-seat, open-top, lightweight roadster racer. Ten years later, the name was revived for the commercially distributed Sonett models II, V4, and III. __TOC__ Sonett I In the 1950s, Rolf Mellde—a Saab engine developer and race enthusiast—along with Lars Olov Olsson, Olle Lindkvist, and Gotta Svensson, designed a two-seat roadster prototype in a barn in Åsaka, near Trollhättan (the site of the main Saab manufacturing facility). The limited research-and-development project, with a total budget of only , first came to be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
