Wikisage is op 1 na de grootste internet-encyclopedie in het Nederlands. Iedereen kan de hier verzamelde kennis gratis gebruiken, zonder storende advertenties. De Koninklijke Bibliotheek van Nederland heeft Wikisage in 2018 aangemerkt als digitaal erfgoed.
- Wilt u meehelpen om Wikisage te laten groeien? Maak dan een account aan. U bent van harte welkom. Zie: Portaal:Gebruikers.
- Bent u blij met Wikisage, of wilt u juist meer? Dan stellen we een bescheiden donatie om de kosten te bestrijden zeer op prijs. Zie: Portaal:Donaties.
George Zweig: verschil tussen versies
(https://nl.wikipedia.org/w/index.php?title=George_Zweig&oldid=45658770 Leenkruithof 27 dec 2015) |
(oorspronkelijk uit Wikipedia:en:George Zweig, versie Wikipedia:en:special:redirect/revision/693369298 en half onvertaald) |
||
| Regel 30: | Regel 30: | ||
==Biografie== | ==Biografie== | ||
Zweig is geboren in [[Moskou (hoofdbetekenis)|Moskou]], [[Russische Socialistische Federatieve Sovjetrepubliek|Rusland]] uit een joodse familie.<ref>Panos Charitos interviews George Zweig (2013) [http://ph-news.web.cern.ch/content/interview-george-zweig CERN Interview].</ref> His father was a type of civil engineer known as a [[structural engineer]]. He graduated from the [[University of Michigan]] in 1959, with a bachelor's degree in [[mathematics]], having taken numerous physics courses as [[electives]]. He earned a PhD degree in theoretical physics at the [[California Institute of Technology]] in 1964 . | Zweig is geboren in [[Moskou (hoofdbetekenis)|Moskou]], [[Russische Socialistische Federatieve Sovjetrepubliek|Rusland]] uit een joodse familie.<ref>Panos Charitos interviews George Zweig (2013) [http://ph-news.web.cern.ch/content/interview-george-zweig CERN Interview].</ref> His father was a type of civil engineer known as a [[structural engineer]]. He graduated from the [[University of Michigan]] in 1959, with a bachelor's degree in [[mathematics]], having taken numerous physics courses as [[electives]]. He earned a PhD degree in theoretical physics at the [[California Institute of Technology]] in 1964. | ||
==Werk== | ==Werk== | ||
| Regel 57: | Regel 57: | ||
| title=Concrete Quarks: The Beginning of the End | | title=Concrete Quarks: The Beginning of the End | ||
| url= http://phsummer2013.web.cern.ch/PHsummer2013/Beginning_of_the_End_F.pdf | | url= http://phsummer2013.web.cern.ch/PHsummer2013/Beginning_of_the_End_F.pdf | ||
| work=CERN colloquium }}</ref> by the peculiarly attenuated decays of the {{ | | work=CERN colloquium }}</ref> by the peculiarly attenuated decays of the {{math|φ}} meson to {{math|ρ π}}, a feature codified by what is now known as the [[OZI Rule]], the "Z" in which stands for "Zweig". In subsequent technical terminology, ultimately Gell-Mann's quarks were closer to "current quarks", while Zweig's to "constituent quarks".<ref>[http://cds.cern.ch/record/1602433 Concrete quarks: CERN 2013 colloquium] , [http://vmsstreamer1.fnal.gov/Lectures/Colloquium/140319Zweig/index.htm ditto, FNAL 2014]</ref> | ||
As pointed out by astrophysicist [[John Gribbin]], Gell-Mann deservedly received the [[Nobel Prize]] for physics in 1969, for his overall contributions and discoveries concerning the classification of elementary particles and their interactions; at that time, quark theory had not become fully accepted,<ref>Missing hadronic resonance states predicted by the quark model were only established in the early 1970s. Appreciation that flavor SU(3) reflects nothing beyond the symmetries of the three lightest quarks had to wait until the late 1970s. Understanding of the reason free quark searches were turning up negative was lacking until 1974.</ref> and was not specifically mentioned in the official citation of the prize. In later years, when quark theory became established as the standard model of [[particle physics]], the Nobel committee presumably felt they couldn't recognize Zweig as the scientist who first spelled out the theory's implications in detail and suggested that they might be real, without including Gell-Mann again. | As pointed out by astrophysicist [[John Gribbin]], Gell-Mann deservedly received the [[Nobel Prize]] for physics in 1969, for his overall contributions and discoveries concerning the classification of elementary particles and their interactions; at that time, quark theory had not become fully accepted,<ref>Missing hadronic resonance states predicted by the quark model were only established in the early 1970s. Appreciation that flavor SU(3) reflects nothing beyond the symmetries of the three lightest quarks had to wait until the late 1970s. Understanding of the reason free quark searches were turning up negative was lacking until 1974.</ref> and was not specifically mentioned in the official citation of the prize. In later years, when quark theory became established as the standard model of [[particle physics]], the Nobel committee presumably felt they couldn't recognize Zweig as the scientist who first spelled out the theory's implications in detail and suggested that they might be real, without including Gell-Mann again. | ||
| Regel 83: | Regel 83: | ||
{{Appendix|2= | {{Appendix|2= | ||
{{References}} | {{References}} | ||
{{Wikidata|Q547674}} }} | {{Wikidata|Q547674}} }} | ||
{{help mee}} | |||
{{DEFAULTSORT:Zweig, George}} | {{DEFAULTSORT:Zweig, George}} | ||
[[Categorie:Amerikaans wetenschapper]] | [[Categorie:Amerikaans wetenschapper]] | ||
Versie van 14 mrt 2018 18:06
| George Zweig | ||
| Bestand:George Zweig.jpg | ||
| Persoonlijke gegevens | ||
| Geboortedatum | 30 mei 1937 | |
| Geboorteplaats | Moskou, RSFSR | |
| Nationaliteit | Amerikaans | |
| Wetenschappelijk werk | ||
| Vakgebied | natuurkunde; neurobiologie | |
| Alma mater | University of Michigan, California Institute of Technology | |
| Instituten | LANL, MIT | |
George Zweig (Moskou, 30 mei 1937) is een Amerikaanse fysicus. He was trained as a particle physicist under Richard Feynman.[1] Hij introduceerde, onafhankelijk van Murray Gell-Mann, het quark-model. Later is hij zich gaan bezighouden met neurobiologie. Hij heeft als wetenschappelijk onderzoeker gewerkt bij het Los Alamos National Laboratory en het MIT, en in de financiële dienstverlening.
Biografie
Zweig is geboren in Moskou, Rusland uit een joodse familie.[2] His father was a type of civil engineer known as a structural engineer. He graduated from the University of Michigan in 1959, with a bachelor's degree in mathematics, having taken numerous physics courses as electives. He earned a PhD degree in theoretical physics at the California Institute of Technology in 1964.
Werk
Zweig voorspelde het bestaan van quarks at CERN, onafhankelijk van Murray Gell-Mann, right after defending his PhD dissertation. Zweig noemde deze "aces", naar de vier bekende kaarten, omdat hij verwachtte dat er vier van deze deeltjes bestonden (op grond van de toen vier bekende leptons).[3][4] The introduction of quarks provided a cornerstone for particle physics.
Like Gell-Mann, he realized that several important properties of particles such as baryons (e.g., protons and neutrons) could be explained by treating them as triplets of other constituent particles (which he called aces and Gell-Mann called quarks), with fractional baryon number and electric charge. Unlike Gell-Mann, Zweig was partly led to his picture of the quark model[5][6] by the peculiarly attenuated decays of the φ meson to ρ π, a feature codified by what is now known as the OZI Rule, the "Z" in which stands for "Zweig". In subsequent technical terminology, ultimately Gell-Mann's quarks were closer to "current quarks", while Zweig's to "constituent quarks".[7]
As pointed out by astrophysicist John Gribbin, Gell-Mann deservedly received the Nobel Prize for physics in 1969, for his overall contributions and discoveries concerning the classification of elementary particles and their interactions; at that time, quark theory had not become fully accepted,[8] and was not specifically mentioned in the official citation of the prize. In later years, when quark theory became established as the standard model of particle physics, the Nobel committee presumably felt they couldn't recognize Zweig as the scientist who first spelled out the theory's implications in detail and suggested that they might be real, without including Gell-Mann again. Nevertheless, in 1977 Richard Feynman nominated both Gell-Mann and Zweig for the Nobel prize, presumed to be his only nomination for such.[9] Whatever the reason, despite Zweig's contributions to a theory central to modern physics, he has not yet been awarded a Nobel prize.[10]
Zweig later turned to hearing research and neurobiology, and studied the transduction of sound into nerve impulses in the cochlea of the human ear,[11] and how the brain maps sound onto the spatial dimensions of the cerebral cortex. In 1975, while studying the ear,[12] he discovered a version of the continuous wavelet transform, the cochlear transform.
In 2003, Zweig joined the quantitative hedge fund Renaissance Technologies, founded by the former Cold War code breaker James Simons. He left the firm in 2010.
Once his four year confidentiality agreement with Renaissance Technologies expired, the 78-year-old Zweig returned to Wall Street and co-founded a quantitative hedge fund, called Signition, with two younger partners. They hope to begin trading in 2015. Zweig was quoted as saying "life can be very boring" without work.[13]
Onderscheidingen
- MacArthur Prize Fellowship (1981)
- National Academy of Sciences (1996)
- Sakurai Prize (2015)
Bronnen, noten en/of referenties
|
Er is nog hulp nodig bij het proeflezen en verbeteren van dit artikel.
Je kan meehelpen door je (gratis) te registreren en op bewerken te klikken om je kennis aan dit artikel toe te voegen.