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Finn Ravndal
Finn Ravndal (born 1942) is a Norwegian physicist. Ravndal grew up in Molde, Norway. In 1961 he enrolled at the Norwegian Institute of Technology to study physics (Teknisk Fysikk). In 1966 he completed the degree of ''sivilingeniør'' (equivalent to Bachelor of Science) with a dissertation in the area of theoretical physics under the supervision of Harald Wergeland. During the summer of 1965, he interned at CERN where he worked with an experimental particle physics group to study bubble chamber images for the detection of new elementary particles. Ravndal received in 1968 a Norwegian doctorate (dr.ing.) in theoretical physics, while completing his national service at Forsvarets forskningsinstitutt, working with the effects of electromagnetic pulses (EMP) from atomic explosions. From 1968, he obtained a position to study at the California Institute of Technology (Caltech). There, in collaboration with Richard Feynman, he developed a relativistic model of quarks which led ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nesna
Nesna is a municipality in Nordland county, Norway. It is part of the Helgeland traditional region. The administrative centre of the municipality is the village of Nesna. Other villages in Nesna include Handnesneset, Husby, Saura, and Vikholmen. The municipality consists of the three islands Tomma, Hugla (known as "Hugløy" by its inhabitants), and Handnesøya, and one peninsula that bears the name of the municipality, Nesna. The old Husby Estate is headquartered in Husby on Tomma island. The Coastal Express arrives two times a day at the village of Nesna, the northbound arrives 05:30 and the southbound 11:15. The village of Nesna is also home to Nordland's education center Nesna University College, and there is also the KVN High School, and Nesna Church. The municipality is the 309th largest by area out of the 356 municipalities in Norway. Nesna is the 296th most populous municipality in Norway with a population of 1,698. The municipality's population density is and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantum Field Theory
In theoretical physics, quantum field theory (QFT) is a theoretical framework that combines classical field theory, special relativity, and quantum mechanics. QFT is used in particle physics to construct physical models of subatomic particles and in condensed matter physics to construct models of quasiparticles. QFT treats particles as excited states (also called Quantum, quanta) of their underlying quantum field (physics), fields, which are more fundamental than the particles. The equation of motion of the particle is determined by minimization of the Lagrangian, a functional of fields associated with the particle. Interactions between particles are described by interaction terms in the Lagrangian (field theory), Lagrangian involving their corresponding quantum fields. Each interaction can be visually represented by Feynman diagrams according to perturbation theory (quantum mechanics), perturbation theory in quantum mechanics. History Quantum field theory emerged from the wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Living People
Related categories * :Year of birth missing (living people) / :Year of birth unknown * :Date of birth missing (living people) / :Date of birth unknown * :Place of birth missing (living people) / :Place of birth unknown * :Year of death missing / :Year of death unknown * :Date of death missing / :Date of death unknown * :Place of death missing / :Place of death unknown * :Missing middle or first names See also * :Dead people * :Template:L, which generates this category or death years, and birth year and sort keys. : {{DEFAULTSORT:Living people 21st-century people People by status ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1942 Births
Year 194 ( CXCIV) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Septimius and Septimius (or, less frequently, year 947 ''Ab urbe condita''). The denomination 194 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 Septimius Severus and Decimus Clodius Septimius Albinus Caesar become Roman Consuls. * Battle of Issus: Septimius Severus marches with his army (12 legions) to Cilicia, and defeats Pescennius Niger, Roman governor of Syria. Pescennius retreats to Antioch, and is executed by Severus' troops. * Septimius Severus besieges Byzantium (194–196); the city walls suffer extensive damage. Asia * Battle of Yan Province: Warlords Cao Cao and Lü Bu fight for control over Yan Province; the battle lasts for over 100 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Det Kongelige Norske Videnskabers Selskab
The Royal Norwegian Society of Sciences and Letters ( da, Det Kongelige Norske Videnskabers Selskab, DKNVS) is a Norwegian learned society based in Trondheim. It was founded in 1760 and is Norway's oldest scientific and scholarly institution. The society's Protector is King Harald V of Norway. Its membership consists of no more than 435 members elected for life among the country's most prominent scholars and scientists. The society’s Danish name predates both written standards for Norwegian and has remained unchanged after Norway’s independence from Denmark in 1814 and the spelling reforms of the 20th century. History DKNVS was founded in 1760 by the bishop of Nidaros Johan Ernst Gunnerus, headmaster at the Trondheim Cathedral School Gerhard Schøning and Councillor of State Peter Frederik Suhm under the name ''Det Trondhiemske Selskab'' (the Trondheim Society). From 1761 it published academic papers in a series titled ''Skrifter''. It was the northernmost learned society ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Norwegian Society Of Sciences And Letters
The Royal Norwegian Society of Sciences and Letters ( da, Det Kongelige Norske Videnskabers Selskab, DKNVS) is a Norwegian learned society based in Trondheim. It was founded in 1760 and is Norway's oldest scientific and scholarly institution. The society's Protector is King Harald V of Norway. Its membership consists of no more than 435 members elected for life among the country's most prominent scholars and scientists. The society’s Danish name predates both written standards for Norwegian and has remained unchanged after Norway’s independence from Denmark in 1814 and the spelling reforms of the 20th century. History DKNVS was founded in 1760 by the bishop of Nidaros Johan Ernst Gunnerus, headmaster at the Trondheim Cathedral School Gerhard Schøning and Councillor of State Peter Frederik Suhm under the name ''Det Trondhiemske Selskab'' (the Trondheim Society). From 1761 it published academic papers in a series titled ''Skrifter''. It was the northernmost learned society in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Det Norske Videnskaps-Akademi
The Norwegian Academy of Science and Letters ( no, Det Norske Videnskaps-Akademi, DNVA) is a learned society based in Oslo, Norway. Its purpose is to support the advancement of science and scholarship in Norway. History The Royal Frederick University in Christiania was established in 1811. The idea of a learned society in Christiania surfaced for the first time in 1841. The city of Trondhjem had no university, but had a learned society, the Royal Norwegian Society of Sciences and Letters, established in 1760. The purpose of a learned society in Christiania was to support scientific studies and aid publication of academic papers. The idea of the Humboldt-inspired university, where independent research stood strong, had taken over for the instrumental view of a university as a means to produce civil servants. The city already had societies for specific professions, for instance the Norwegian Medical Society which was founded in 1833. However, these societies were open for both ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Professor Emeritus
''Emeritus'' (; female: ''emerita'') is an adjective used to designate a retired chair, professor, pastor, bishop, pope, director, president, prime minister, rabbi, emperor, or other person who has been "permitted to retain as an honorary title the rank of the last office held". In some cases, the term is conferred automatically upon all persons who retire at a given rank, but in others, it remains a mark of distinguished service awarded selectively on retirement. It is also used when a person of distinction in a profession retires or hands over the position, enabling their former rank to be retained in their title, e.g., "professor emeritus". The term ''emeritus'' does not necessarily signify that a person has relinquished all the duties of their former position, and they may continue to exercise some of them. In the description of deceased professors emeritus listed at U.S. universities, the title ''emeritus'' is replaced by indicating the years of their appointmentsThe Protoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dirac Equation
In particle physics, the Dirac equation is a relativistic wave equation derived by British physicist Paul Dirac in 1928. In its free form, or including electromagnetic interactions, it describes all spin- massive particles, called "Dirac particles", such as electrons and quarks for which parity is a symmetry. It is consistent with both the principles of quantum mechanics and the theory of special relativity, and was the first theory to account fully for special relativity in the context of quantum mechanics. It was validated by accounting for the fine structure of the hydrogen spectrum in a completely rigorous way. The equation also implied the existence of a new form of matter, ''antimatter'', previously unsuspected and unobserved and which was experimentally confirmed several years later. It also provided a ''theoretical'' justification for the introduction of several component wave functions in Pauli's phenomenological theory of spin. The wave functions in the Dirac theo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antiparticles
In particle physics, every type of particle is associated with an antiparticle with the same mass but with opposite physical charges (such as electric charge). For example, the antiparticle of the electron is the positron (also known as an antielectron). While the electron has a negative electric charge, the positron has a positive electric charge, and is produced naturally in certain types of radioactive decay. The opposite is also true: the antiparticle of the positron is the electron. Some particles, such as the photon, are their own antiparticle. Otherwise, for each pair of antiparticle partners, one is designated as the normal particle (the one that occurs in matter usually interacted with in daily life). The other (usually given the prefix "anti-") is designated the ''antiparticle''. Particle–antiparticle pairs can annihilate each other, producing photons; since the charges of the particle and antiparticle are opposite, total charge is conserved. For example, the posit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klein Paradox
In 1929, physicist Oskar Klein obtained a surprising result by applying the Dirac equation to the familiar problem of electron scattering from a potential barrier. In nonrelativistic quantum mechanics, electron tunneling into a barrier is observed, with exponential damping. However, Klein's result showed that if the potential is at least of the order of the electron mass, Ve\sim mc^2, the barrier is nearly transparent. Moreover, as the potential approaches infinity, the reflection diminishes and the electron is always transmitted. The immediate application of the paradox was to Rutherford's proton–electron model for neutral particles within the nucleus, before the discovery of the neutron. The paradox presented a quantum mechanical objection to the notion of an electron confined within a nucleus. This clear and precise paradox suggested that an electron could not be confined within a nucleus by any potential well. The meaning of this paradox was intensely debated at the tim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alex Hansen
Alex is a given name. It can refer to a shortened version of Alexander, Alexandra, Alexis. People Multiple *Alex Brown (other), multiple people *Alex Gordon (other), multiple people *Alex Harris (other), multiple people *Alex Jones (other), multiple people *Alexander Johnson (other), multiple people *Alex Taylor (other), multiple people Politicians * Alex Allan (born 1951), British diplomat * Alex Attwood (born 1959), Northern Irish politician *Alex Kushnir (born 1978), Israeli politician * Alex Salmond (born 1954), Scottish politician, former First Minister of Scotland Baseball players *Alex Avila (born 1987), American baseball player *Alex Bregman (born 1994), American baseball player *Alex Gardner (baseball) (1861–1921), Canadian baseball player * Alex Katz (baseball) (born 1994), American baseball player * Alex Pompez (1890–1974), American executive in Negro league baseball and Major League Baseball scout * Alex Ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
