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KEK Metz
, known as KEK, is a Japanese organization whose purpose is to operate the largest particle physics laboratory in Japan, situated in Tsukuba, Ibaraki prefecture. It was established in 1997. The term "KEK" is also used to refer to the laboratory itself, which employs approximately 695 employees. KEK's main function is to provide the particle accelerators and other infrastructure needed for high-energy physics, material science, structural biology, radiation science, computing science, nuclear transmutation and so on. Numerous experiments have been constructed at KEK by the internal and international collaborations that have made use of them. Makoto Kobayashi, emeritus professor at KEK, is known globally for his work on CP-violation, and was awarded the 2008 Nobel Prize in Physics. History KEK was established in 1997 in a reorganization of the Institute of Nuclear Study, the University of Tokyo (established in 1955), the National Laboratory for High Energy Physics (esta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tsukuba
is a city located in Ibaraki Prefecture, Japan. , the city had an estimated population of 244,528 in 108,669 households and a population density of 862 persons per km². The percentage of the population aged over 65 was 20.3%. The total area of the city is . It is known as the location of the , a planned science park developed in the 1960s. Geography Tsukuba is located in southern Ibaraki Prefecture, approximately 50 kilometers from central Tokyo and about 40 kilometers from Narita International Airport. Mount Tsukuba, from which the city takes its name is located in the northern part of the city. Except for the area around Mount Tsukuba, the city is a part of the Kantō Plain with an altitude of 20 to 30 meters. Mountains: Mount Tsukuba, Mount Hokyo. Rivers: Kokai River, Sakura River, Higashiyata River, Nishiyata River, Ono River, Hanamuro River, Inari River. Parks: The city has more of 100 parks and green areas to relax. Different parks are connected by pedestrian w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1971 In Science
The year 1971 in science and technology involved some significant events, listed below. Astronomy and space exploration * January 31 – Apollo program: Astronauts aboard Apollo 14 lift off for a mission to the Moon. * February 5 – Apollo 14 lands on the Moon. * February 9 – Apollo program: Apollo 14 returns to Earth after the third manned Moon landing. * May 19 – Mars probe program: Mars 2 is launched by the Soviet Union. * May 30 – Mariner program: Mariner 9 is launched toward Mars. * June 30 – The crew of the Soyuz 11 spacecraft are killed when their air supply leaks out through a faulty valve during re-entry preparations, the only human deaths to occur outside Earth's atmosphere. * July 26 – Apollo program: Launch of Apollo 15. On July 31 the Apollo 15 astronauts become the first to ride in a lunar rover a day after landing on the Moon's surface. * November 13 – Mariner program: Mariner 9 enters Mars orbit. Biology * July – Francis G. Howart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Positron
The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. It has an electric charge of +1 '' e'', a spin of 1/2 (the same as the electron), and the same mass as an electron. When a positron collides with an electron, annihilation occurs. If this collision occurs at low energies, it results in the production of two or more photons. Positrons can be created by positron emission radioactive decay (through weak interactions), or by pair production from a sufficiently energetic photon which is interacting with an atom in a material. History Theory In 1928, Paul Dirac published a paper proposing that electrons can have both a positive and negative charge. This paper introduced the Dirac equation, a unification of quantum mechanics, special relativity, and the then-new concept of electron spin to explain the Zeeman effect. The paper did not explicitly predict a new particle but did allow for electrons having either positive or negative ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1985 In Science
The year 1985 in science and technology involved many significant events, listed below. Astronomy and space exploration * January 7 – Japan Aerospace Exploration Agency launches ''Sakigake'', Japan's first interplanetary spacecraft and the first deep space probe to be launched by any country other than the United States or the Soviet Union. Chemistry * The fullerene Buckminsterfullerene (C60) is first intentionally prepared by Harold Kroto, James R. Heath, Sean O'Brien, Robert Curl and Richard Smalley at Rice University in the United States. Computer science * March – The ''GNU Manifesto'', written by Richard Stallman, is first published. * March 15 – The first commercial Internet domain name, in the top-level domain ''.com'', is registered in the name ''symbolics.com'' by Symbolics Inc., a computer systems firm in Cambridge, Massachusetts. * November 20 – Microsoft Windows operating system released. Environment * May 16 – Scientists of the British Antarctic Survey an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1984 In Science
The year 1984 in science and technology involved some significant events. Astronomy and space exploration * February 7 – Astronauts Bruce McCandless II and Robert L. Stewart make the first untethered space walk. * The National Radio Astronomy Observatory in the United States converts the 36-foot radio telescope on Kitt Peak (originally built in 1967) to the ARO 12m Radio Telescope. Biology * First known case of Bovine spongiform encephalopathy, in England. * The enzyme telomerase is discovered by Carol W. Greider and Elizabeth Blackburn in the ciliate ''Tetrahymena''. * Danish physiologist Steen Willadsen first successfully uses cells from early embryos to clone a mammal (sheep) by nuclear transfer at the British Agricultural Research Council's Institute of Animal Physiology, Cambridge. Chemistry and physics * Peter Kramer and Dan Shechtman publish their discoveries of what will soon afterwards be named quasicrystals. * Hiroshi Kobayashi and colleagues announce synthesis of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Beam
A particle beam is a stream of charged or neutral particles. In particle accelerators, these particles can move with a velocity close to the speed of light. There is a difference between the creation and control of charged particle beams and neutral particle beams, as only the first type can be manipulated to a sufficient extent by devices based on electromagnetism. The manipulation and diagnostics of charged particle beams at high kinetic energies using particle accelerators are main topics of accelerator physics. Sources Charged particles such as electrons, positrons, and protons may be separated from their common surrounding. This can be accomplished by e.g. thermionic emission or arc discharge. The following devices are commonly used as sources for particle beams: * Ion source * Cathode ray tube, or more specifically in one of its parts called electron gun. This is also part of traditional television and computer screens. * Photocathodes may also be built in as a part of an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electron
The electron ( or ) is a subatomic particle with a negative one elementary electric charge. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. The electron's mass is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum ( spin) of a half-integer value, expressed in units of the reduced Planck constant, . Being fermions, no two electrons can occupy the same quantum state, in accordance with the Pauli exclusion principle. Like all elementary particles, electrons exhibit properties of both particles and waves: They can collide with other particles and can be diffracted like light. The wave properties of electrons are easier to observe with experiments than those of other particles like neutrons and protons because electrons have a lower mass and hence a longer de Broglie wavele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1982 In Science
The year 1982 in science and technology involved many significant events, listed below. Astronomy * January 17 – Allan Hills A81005, the first lunar meteorite found on Earth, is discovered in the Allan Hills at the end of the Transantarctic Mountains by John Schutt and Ian Whillans during the ANSMET meteorite gathering expedition. * March 10 – Syzygy: all 9 planets align on the same side of the Sun. * October 14 – Halley's Comet: First spotted in the sky after 70 year return. Biology * September – First report of anti-human monoclonal antibody production. Computer science * January 7 – The Commodore 64 8-bit home computer is launched by Commodore International (released in August); it becomes the all-time best-selling single personal computer model. * January 30 – First computer virus, the Elk Cloner, written by 15-year-old Rich Skrenta, is found in the wild. It infects Apple II computers via floppy disk. * July 9 – Sci-fi movie ''Tron'' is the first feature film ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photon
A photon () is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force. Photons are massless, so they always move at the speed of light in vacuum, (or about ). The photon belongs to the class of bosons. As with other elementary particles, photons are best explained by quantum mechanics and exhibit wave–particle duality, their behavior featuring properties of both waves and particles. The modern photon concept originated during the first two decades of the 20th century with the work of Albert Einstein, who built upon the research of Max Planck. While trying to explain how matter and electromagnetic radiation could be in thermal equilibrium with one another, Planck proposed that the energy stored within a material object should be regarded as composed of an integer number of discrete, equal-sized parts. To explain the photoelectric effect, Eins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synchrotron
A synchrotron is a particular type of cyclic particle accelerator, descended from the cyclotron, in which the accelerating particle beam travels around a fixed closed-loop path. The magnetic field which bends the particle beam into its closed path increases with time during the accelerating process, being ''synchronized'' to the increasing kinetic energy of the particles. The synchrotron is one of the first accelerator concepts to enable the construction of large-scale facilities, since bending, beam focusing and acceleration can be separated into different components. The most powerful modern particle accelerators use versions of the synchrotron design. The largest synchrotron-type accelerator, also the largest particle accelerator in the world, is the Large Hadron Collider (LHC) near Geneva, Switzerland, built in 2008 by the European Organization for Nuclear Research (CERN). It can accelerate beams of protons to an energy of 6.5 tera electronvolts (TeV or 1012 eV). Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1978 In Science
The year 1978 in science and technology involved some significant events, listed below. Astronomy and space science * March 2 – Vladimír Remek becomes the first Czechoslovak in space and the first cosmonaut from a country other than the Soviet Union or the United States, onboard Soyuz 28. * June 22 – James W. Christy at the United States Naval Observatory discovers Charon, the first moon of Pluto identified. * October – It is first proposed that Janus and Epimetheus are two separate moons of Saturn sharing the same orbit. Computer science * February 16 – The first computer bulletin board system is created ( CBBS in Chicago, Illinois). * The RSA algorithm for public-key cryptography, based on the factoring problem, is first publicly described by Ron Rivest, Adi Shamir and Leonard Adleman. Geophysics * James Byerlee determines Byerlee's law which gives the stress circumstances in the Earth's crust at which fracturing along a geological fault takes place. History of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electronvolt
In physics, an electronvolt (symbol eV, also written electron-volt and electron volt) is the measure of an amount of kinetic energy In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acc ... gained by a single electron accelerating from rest through an Voltage, electric potential difference of one volt in vacuum. When used as a Units of energy, unit of energy, the numerical value of 1 eV in joules (symbol J) is equivalent to the numerical value of the Electric charge, charge of an electron in coulombs (symbol C). Under the 2019 redefinition of the SI base units, this sets 1 eV equal to the exact value Historically, the electronvolt was devised as a standard unit of measure through its usefulness in Particle accelerator#Electrostatic particle accelerators, electrostatic particle accel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
