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Lincoln Wolfenstein
Lincoln Wolfenstein (February 10, 1923 – March 27, 2015) was an American particle physics, particle physicist who studied the weak interaction. Wolfenstein was born in 1923 and obtained his PhD in 1949 from the University of Chicago. He retired from Carnegie Mellon University in 2000 after being a faculty member for 52 years. Despite being retired, he continued to come into work nearly every day. Wolfenstein was a particle phenomenologist, a theorist who focused primarily on connecting theoretical physics to experimental physics, experimental observations. In 1978, he noted that the presence of electrons in Earth and Sun, Solar matter could affect neutrino propagation. This work led to an eventual understanding of the MSW effect, which acts to enhance neutrino oscillation in matter. Wolfenstein received the 2005 :de:Bruno-Pontecorvo-Preis, Bruno Pontecorvo Prize from The Scientific Council of the Joint Institute for Nuclear Research (JINR), for his pioneering work on the MSW ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cleveland, Ohio
Cleveland is a city in the U.S. state of Ohio and the county seat of Cuyahoga County, Ohio, Cuyahoga County. Located along the southern shore of Lake Erie, it is situated across the Canada–United States border, Canada–U.S. maritime border and approximately west of the Ohio-Pennsylvania state border. Cleveland is the most populous city on Lake Erie, the list of cities in Ohio, second-most populous city in Ohio, and the List of United States cities by population, 53rd-most populous city in the U.S. with a population of 372,624 in 2020. The city anchors the Greater Cleveland, Cleveland metropolitan area, the Metropolitan statistical area, 33rd-largest in the U.S. at 2.18 million residents, as well as the larger Cleveland–Akron, Ohio, Akron–Canton, Ohio, Canton combined statistical area with 3.63 million residents. Cleveland was founded in 1796 near the mouth of the Cuyahoga River as part of the Connecticut Western Reserve in modern-day Northeast Ohio by General Moses Clea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth
Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering Water distribution on Earth, 70.8% of Earth's crust. The remaining 29.2% of Earth's crust is land, most of which is located in the form of continental landmasses within Earth's land hemisphere. Most of Earth's land is at least somewhat humid and covered by vegetation, while large Ice sheet, sheets of ice at Polar regions of Earth, Earth's polar polar desert, deserts retain more water than Earth's groundwater, lakes, rivers, and Water vapor#In Earth's atmosphere, atmospheric water combined. Earth's crust consists of slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. Earth's outer core, Earth has a liquid outer core that generates a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2015 Deaths
This is a list of lists of deaths of notable people, organized by year. New deaths articles are added to their respective month (e.g., Deaths in ) and then linked below. 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 Earlier years ''Deaths in years earlier than this can usually be found in the main articles of the years.'' See also * Lists of deaths by day * Deaths by year (category) {{DEFAULTSORT:deaths by year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1923 Births
In Greece, this year contained only 352 days as 13 days was skipped to achieve the calendrical switch from Julian to Gregorian Calendar. It happened there that Wednesday, 15 February ''(Julian Calendar)'' was followed by Thursday, 1 March ''(Gregorian Calendar).'' Events January–February * January 9, January 5 – Lithuania begins the Klaipėda Revolt to annex the Klaipėda Region (Memel Territory). * January 11 – Despite strong British protests, troops from France and Belgium Occupation of the Ruhr, occupy the Ruhr area, to force Germany to make reparation payments. * January 17 (or 9) – First flight of the first rotorcraft, Juan de la Cierva's Cierva C.4 autogyro, in Spain. (It is first demonstrated to the military on January 31.) * February 5 – Australian cricketer Bill Ponsford makes 429 runs to break the world record for the highest first-class cricket score for the first time in his third match at this level, at Melbourne Cricket Ground, giving the Victor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Institute Of Physics
The American Institute of Physics (AIP) promotes science and the profession of physics, publishes physics journals, and produces publications for scientific and engineering societies. The AIP is made up of various member societies. Its corporate headquarters are at the American Center for Physics in College Park, Maryland, but the institute also has offices in Melville, New York, and Beijing. Historical overview The AIP was founded in 1931 as a response to lack of funding for the sciences during the Great Depression. /www.aip.org/aip/history "History of AIP" American Institute of Physics. July 2010. The AIP was founded in 1931 at a joint meeting between four physics societies: the American Physical Society, the Optical Society of America, the Acoustical Society of America, and the Society of Rheology. These were soon joined by the American Association of Physics Teachers, for a total of five societies. It formally incorporated in 1932 consisting of five original "member so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trimaximal Mixing
Trimaximal mixing (also known as threefold maximal mixing ) refers to the highly symmetric, maximally CP-violating, 3 \times 3 fermion mixing configuration, characterised by a unitary matrix (U) having all its elements equal in modulus ( , U_, =1/\sqrt, a,i=1,2,3) as may be written, e.g.: : U= \begin \frac & \frac & \frac \\ \frac & \frac & \frac \\ \frac & \frac & \frac \end \Rightarrow (, U_, ^2)= \begin \frac & \frac & \frac \\ \frac & \frac & \frac \\ \frac & \frac & \frac \end where \omega=\exp(i2\pi/3) and \bar=\exp(-i2\pi/3) are the complex cube roots of unity. In the standard PDG convention, trimaximal mixing corresponds to: \theta_=\theta_=\pi/4, \theta_=\sin^(1/\sqrt) and \delta=\pi/2. The Jarlskog CP-violating parameter J takes its extremal value , J, =1/(6\sqrt). Originally proposed as a candidate lepton mixing matrix, and actively studied as such (and even as a candidate quark mixing matrix ), trimaximal mixing is now definitively ruled-out as a phen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CP Violation
In particle physics, CP violation is a violation of CP-symmetry (or charge conjugation parity symmetry): the combination of C-symmetry (charge conjugation symmetry) and P-symmetry ( parity symmetry). CP-symmetry states that the laws of physics should be the same if a particle is interchanged with its antiparticle (C-symmetry) while its spatial coordinates are inverted ("mirror" or P-symmetry). CP violation is only observed in the weak interaction. The discovery of CP violation in 1964 in the decays of neutral kaons resulted in the Nobel Prize in Physics in 1980 for its discoverers James Cronin and Val Fitch. CP violation was subsequently discovered in many other meson decays. In 2025, the LHCb experiment discovered CP violation in baryons. There is some evidence CP violation may occur in neutrino interactions. It is important to the matter-antimatter asymmetry problem, the strong CP problem, and in the study of weak interactions in particle physics. Under the CPT theorem, e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Physical Society
The American Physical Society (APS) is a not-for-profit membership organization of professionals in physics and related disciplines, comprising nearly fifty divisions, sections, and other units. Its mission is the advancement and diffusion of knowledge of physics. It publishes more than a dozen scientific journals, including the prestigious '' Physical Review'' and ''Physical Review Letters'', and organizes more than twenty science meetings each year. It is a member society of the American Institute of Physics. Since January 2021, it is led by chief executive officer Jonathan Bagger. History The American Physical Society was founded on May 20, 1899, when thirty-six physicists gathered at Columbia University for that purpose. They proclaimed the mission of the new Society to be "to advance and diffuse the knowledge of physics", and in one way or another the APS has been at that task ever since. In the early years, virtually the sole activity of the APS was to hold scientific m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Academy Of Sciences
The National Academy of Sciences (NAS) is a United States nonprofit, NGO, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the National Academy of Medicine (NAM). As a national academy, new members of the organization are elected annually by current members, based on their distinguished and continuing achievements in original research. Election to the National Academy is one of the highest honors in the scientific field in the United States. Member of the National Academy of Sciences, Members of the National Academy of Sciences serve ''pro bono'' as "advisers to the nation" on science, engineering, and medicine. The group holds a congressional charter under Title 36 of the United States Code. Congress legislated and President Abraham Lincoln signed an Act of Congress (1863) establishing the National Academy of Sciences as an independent, trusted nongovernmen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joint Institute For Nuclear Research
The Joint Institute for Nuclear Research (JINR, ), in Dubna, Moscow Oblast (110 km north of Moscow), Russia, is an international research center for nuclear sciences, with 5,500 staff members including 1,200 researchers holding over 1,000 Ph.D.s from eighteen countries. Most scientists are scientists of the Russian Federation. The institute has seven laboratories, each with its own specialisation: theoretical physics, high energy physics (particle physics), heavy ion physics, condensed matter physics, nuclear reactions, neutron physics, and information technology. The institute has a division to study radiation and radiobiological research and other ad hoc experimental physics experiments. Principal research instruments include a nuclotron superconductive particle accelerator (particle energy: 7 GeV), three isochronous cyclotrons (120, 145, 650 MeV), a phasitron (680 MeV) and a synchrophasotron (4 GeV). The site has a neutron fast-pulse reactor (1,500MW pulse) with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neutrino Oscillation
Neutrino oscillation is a quantum mechanics, quantum mechanical phenomenon in which a neutrino created with a specific lepton lepton number, family number ("lepton flavor": electron, muon, or tau lepton, tau) can later be Quantum measurement, measured to have a different lepton family number. The probability of measuring a particular Flavour (particle physics), flavor for a neutrino varies between three known states, as it propagates through space. First predicted by Bruno Pontecorvo in 1957, reproduced and translated in reproduced and translated in neutrino oscillation has since been observed by a multitude of experiments in several different contexts. Most notably, the existence of neutrino oscillation resolved the long-standing solar neutrino problem. Neutrino oscillation is of great theoretical physics, theoretical and experimental physics, experimental interest, as the precise properties of the process can shed light on several properties of the neutrino. In particular, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
