Geometry.Net - the online learning center
Home  - Scientists - Uhlenbeck George

e99.com Bookstore
  
Images 
Newsgroups
Page 4     61-80 of 93    Back | 1  | 2  | 3  | 4  | 5  | Next 20
A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  

         Uhlenbeck George:     more books (18)
  1. Lectures in Statistical Mechanics (Lectures in Applied Mathematics Series, Vol 1) by George Uhlenbeck, 1974-06
  2. George Uhlenbeck and the discovery of electron spin. by George] PAIS, Abraham (1918-2001). [UHLENBECK, 1989-01-01
  3. Naissance à Jakarta: Anggun, Hella S. Haasse, Jeroen Brouwers, Aude de Kerros, Ilse Werner, George Uhlenbeck, Boudewijn de Groot (French Edition)
  4. Threshold Signals
  5. SPINNING ELECTRONS AND THE STRUCTURE OF SPECTRA. In Nature, No. 2938, Vol. 117, Saturday, Feb. 20, 1926 pp. 264-265. (Discovery of electron spin). by George E. and Samuel Abraham Goudsmit. UHLENBECK, 1926-01-01
  6. Threshold Signals 1st Ed. 6th Printing by Uhlenbeck George E Lawson James L, 1950-01-01
  7. Person (Jakarta): Ilse Werner, George Eugene Uhlenbeck, Ali Alatas, Boudewijn de Groot, Hella Haasse, Wilhelm Homberg, Ali Sadikin (German Edition)
  8. Dutch Scientist Introduction: Willem Hendrik Keesom, Pieter Boddaert, Andre Geim, George Eugene Uhlenbeck, Harry Lintsen, Petrus Jacobus Kipp
  9. Conceptual Development of Statistical Mechanics: Conversations between George E. Uhlenbeck, Mark Kac, and Jagdish Mehra. by Jagdish (ed). Mehra, 1973
  10. THRESHOLD SIGNALS. MIT Radiation Laboratory Series. No. 24. by James L. and George E. Uhlenbeck (Editors). LAWSON, 1950
  11. Threshold Signals - MIT Radiation Laboratory Series Number 24 by James L and George E. Uhlenbeck (editors) Lawson, 1950
  12. Goerge E. Uhlenbeck (December 6, 1900-Octber 31, 1988). by George] PAIS, Abraham (1918-2001). [UHLENBECK, 1989
  13. Fundamental problems in statistical mechanics: A lecture series by George Eugène Uhlenbeck, 1968
  14. On field theories with non-localized action. by Abraham (1918-2001) & George UHLENBECK (1900- 1988). PAIS, 1950

61. Nuclear Age
9. Francis B. Silsbee. NBS. 10. Isidor Isaac. Rabi. Columbia. 11. george Eugene.uhlenbeck. Columbia. 12. george. Gamow. george Washington. 13. Edward. Teller. georgeWashington.
http://www.gwu.edu/~physics/gplate.htm
Announcement of the Nuclear Age at GW
The 1939 public announcement by Niels Bohr of the fission of uranium by Otto Hahn (in Berlin) took place on the GW Campus (Hall of Government) at a conference organized by George Gamow and jointly held with the Carnegie Institution of Washington. Below is photo of GWU-Carnegie Inst. participants at Lisner Auditorium, January, 1939. Gamow and Merle Tuve organized ten such conferences, gathering the best minds to discuss the most pressing questions in physics. Attending the 1939 conference on Low Temperature Physics were (by order in picture, starting with Otto Stern first row, counting left-to-right): First Name Last Name Institution L.H. Adams D.H. Andrews Edward Uhler Condon F.G. Keyes F.C. Kracek E. Posnjak A.E. Ruark Otto Stern Carnegie Tech, Pittsburgh Enrico Fermi Rome, Columbia J. Fleming Carnegie Inst. of Wash. Niels Henrik David Bohr Copenhagen, Princeton Fritz London Duke, Paris Harold Clayton Urey Columbia Ferdinand G. Brickwedde NBS Gregory Breit Wisconson, Carnegie Inst. Francis B. Silsbee NBS Isidor Isaac Rabi Columbia George Eugene Uhlenbeck Columbia George Gamow George Washington Edward Teller George Washington Maria Goeppert-Mayer Johns Hopkins Francis Bitter MIT Hans Albrecht Bethe Cornell Hugh Grayson-Smith Univ. of Toronto

62. The 1947 Shelter Island Conference
Left to right are II Rabi, Linus Pauling, J. Van Vleck, WE Lamb, Gregory Breit,Duncan MacInnes, KK Darrow, george E. uhlenbeck, Julian Schwinger, Edward
http://www.nas.edu/history/sic/sicgroup1.html
Assembled attendees of the 1947 Conference on Quantum Mechanics. Left to right are: I.I. Rabi, Linus Pauling, J. Van Vleck, W.E. Lamb, Gregory Breit, Duncan MacInnes, K.K. Darrow, George E. Uhlenbeck, Julian Schwinger, Edward Teller, Bruno Rossi, Arnold Nordsieck, John von Neumann, Victor F. Weisskopf, Herman Feshback. Not pictured is H.A. Kramers.

63. Information Edge - Newsletter October 2001
complete information. george uhlenbeck was a Dutch born British residentphysicist and discoverer of electron spin . He was also
http://www.infoedge.com.au/nl_0110.htm
Home About Us Rates Request Form ... Newsletters Newsletter - October 2001 Searches Reports Company Profiles Updates Media Research Media Gathering Media Analysis Workshops Useful Links ... Coaching Edge Management Information Edge Database Management EDGE Packaging EDGE Customised Alerting Service ... FOCUS Reports Obtaining Documents Online Our Collection External Sources
Information Edge Pty Ltd
Suite 5, Level 2
710 New South Head Rd
Rose Bay NSW 2029
Australia
ABN 13 003 256 380
infoedge@infoedge.com.au

Whales don't live in landlocked rivers! So is that information worth having? The World Wide Web on the Internet is one of the wonders of the modern world. Certainly it is an enormous stimulus to the spread of knowledge and of information. But it should be used skillfully. In the September 20 1999 Forbes ( www.forbes.com/forbes/99/0920/6407210a.htm ) Stephen Mannes discusses the reliability and completeness of information available on the World Wide Web in his article When it's not on the web. Mannes quotes the computer scientist Weisenbaum who wrote in rather dramatic terms in 1976:
"The computer has thus begun to be an instrument for the destruction of history".

64. Glossaire
Translate this page 1269. Samuel Abraham Goudsmit (1902-1978) et george uhlenbeck (1900-)- 1925 ils définissent le spin de l'électron. Stephen Gray
http://www.genetic.ch/elect/scientifiques.html
A B C D ... A
  • Howard H. Aiken
  • Edwin Armstrong
  • Carl Anderson
  • Svante Arrhenius
  • Arsonval
B
  • Peter Barlow
  • John Barden
  • Emile Baudot
  • Alexandre Graham Bell
  • Jean-Baptiste Biot
  • Antoine Becquerel (1788-1878) - 1827: invention de la pile rechargeable.
  • Blondel
  • Robert Bosch
  • Karl Ferdinand Braun (Allemand 1850-1918) - 1897: invention de l'oscillographe cathodique.
  • Louis
C
  • James Chadwick
  • Leon Cooper
  • William Crookes
  • Charles de Coulomb
  • Pierre et Paul-Jacques Curie
D
  • John Dalton
  • Clinton Joseph Davisson
  • Humphrey Davy
  • Marcel Deprez
  • Johann Wolfgang
  • Frantz Dussaud
E
  • Thomas A. Edison Le Columbia
  • Albert Einstein
  • Julius Elster
  • James Alfred Ewing
F
  • Fay
  • Sebastianno Ziani de Ferranti (Britanique italien 1864-1930) - 1882: mise en service du premier alternateur industriel.
  • John Ambrose Fleming (Britanique 1849-1945) - 1904: invention de la diode.
  • Hippolyte Fontaine
  • Benjamin Franklin
  • Michael Faraday
G
  • Luigi Galvani
  • Lucien Gaulard
  • Hans Geitel
  • Lester Germer
  • William Gilbert
  • Samuel Abraham Goudsmit
  • Stephen Gray
  • Gramme
  • C. F. Gauss
H
  • Edwin Herbert Hall
  • Joseph Henry
  • Heinrich Hertz
  • Hermann von Helmholtz (Allemand 1821-1894) - 1847: introduit la notion d'énergie potentielle et énonce le principe de la conservation de l'énergie. 1851: propose une méthode de mesure de la vitesse de l'influx nerveux. Il invente l'opthalmoscope. 1879: montre que l'électricité a une structure "granulaire".
  • David Edward Hugues
I
  • J
    • James Prescott Joule
    • Jungner
    K
    • J. von
  • 65. Fisica Applicata - Guida Di SuperEva
    Translate this page che porterà nel 1925-26 alla meccanica quantistica, due giovani dottorandi allievidi Paul Ehrenfest a Leida, Samuel Goudsmit e george uhlenbeck, proposero in
    http://guide.supereva.it/fisica_applicata/interventi/2001/09/65729.shtml
    Mappa Aggiungi ai preferiti Help
    sei qui superEva guide Arte, Cultura e Scienze Fisica applicata Fisica applicata
    La guida Claudio Lanzieri Cerca nella guida Home Newsletter Forum Chat ... La Guida risponde Archivio Applicazioni Industriali Articoli Scientifici Attualità Fisica applicata ... Fisica di base Grandi Uomini Ho letto su un giornale INFN Informazioni dal mondo della Ricerca e dell'Industria Proposte dalla comunità ... Tecnologia Applicativa
    Invia ad un amico Il tuo nome
    La sua mail
    Sponsored Links Scuola Sci Cortina
    Per una indimenticabile vacanza sulla neve : la Scuola Sci Cortina offre corsi e lezioni di sci alpino, carving, telemark e snowboard a tutti i livelli, sia per bambini che per adulti. Alunni.net: scuola online
    Grandi Uomini

    100 anni dalla nascita di Enrico Fermi (2) Enrico Fermi, fisico teorico e sperimentale, nato a Roma il 29 settembre 1901, morto a Chicago, Illinois, il 29 novembre 1954.
    Autore delle prime teorie sulle interazioni deboli, è noto soprattutto per le sue ricerche sperimentali di fisica nucleare che portano alla scoperta della fissione nucleare ed ai suoi successivi sviluppi; per queste ricerche compiute a Roma, Fermi ottenne il premio Nobel nel 1938.

    pervenuto indipendentemente a risultati analoghi.

    66. The Science Bookstore - Chronology
    1925 AD, Pierre Auger discovers the Auger autoionization process. 1925AD, george uhlenbeck and Samuel Goudsmit postulate electron spin.
    http://www.thesciencebookstore.com/chron.asp?pg=31

    67. Physics Today May 2001
    theoretical physics, the last PhD from Utrecht awarded to a Dutch Jewduring the occupation. His thesis adviser was george uhlenbeck.
    http://www.physicstoday.com/pt/vol-54/iss-5/p79b.html
    Back to Table of Contents May Obituaries: Abraham 'Bram' Pais Thomas John Ypsilantis George Wilse Robinson William George Fastie ... Chanchal Kumar Majumdar Site Index Physics Today Home Page Current Issue Past Contents Job Ads Upcoming Meetings Buyer's Guide About Physics Today Contact Us Advertising Information Print Ad Rates and Specs Online Ad Rates and Specs Advertiser Index Product Information Information Exchange Abraham 'Bram' Pais Abraham "Bram" Pais had two remarkable careers. As a particle physicist, he was a leader in the tumultuous quarter century after World War II. As a chronicler of physics and biographer of physicists, he has left a rich legacy of firsthand information and insight for the readers of today and the science historians of the future. He died of heart failure on 28 July 2000 in Copenhagen. Bram was born on 19 May 1918 in Amsterdam, where he spent his childhood and school years. He earned BSc degrees in physics and mathematics at the University of Amsterdam in 1938 and an MS in physics at the University of Utrecht in 1940. In 1941, during the early years of the German occupation of the Netherlands, he obtained his PhD in theoretical physics, the last PhD from Utrecht awarded to a Dutch Jew during the occupation. His thesis adviser was George Uhlenbeck. The horrors of the later stages of the occupation claimed his sister Annie, but Bram survived by hiding with the help of a friend, Tina Strobos. This remarkable story appears in

    68. Sen. Paul Simon To Speak At Commencement Ceremonies May 14
    A professor of mathematics at the University of Texas at Austin, uhlenbeck will receivean Honorary Degree of Applied Life Studies 4 pm, 100 george Huff Hall
    http://www.news.uiuc.edu/news/00/0414commence.html
    Home About Us Contact Us For Media ... Search
    RESEARCH

    Science

    General

    Business

    Archives

    NEWS INDEX
    This Year

    Archives

    PUBLICATIONS
    Inside Illinois II Archives About II Postmarks QUICK SEARCH Advanced MORE Campus Calendar UI in the Media Other News Sources NEWS INDEX Sen. Paul Simon to speak at Commencement ceremonies May 14 Jeff Unger, News Bureau director j-unger@uiuc.edu CHAMPAIGN The 129th Commencement of the UI at Urbana-Champaign will be held in two ceremonies May 14 at the Assembly Hall. The speaker at both ceremonies will be former U.S. Sen. Paul Simon of Illinois who will receive an honorary degree, as will five other people. At the 10:30 a.m. ceremony, candidates in the colleges of Applied Life Studies, Communications, Law, Liberal Arts and Sciences, and Veterinary Medicine; the Institute of Labor and Industrial Relations; the School of Social Work; and the Graduate School of Library and Information Science will receive degrees. Candidates in the colleges of Agricultural, Consumer and Environmental Sciences; Commerce and Business Administration; Education; Engineering; and Fine and Applied Arts will receive their degrees at the 2 p.m. ceremony. Doors will open at 9:30 a.m. for the morning ceremony and at 1 p.m. for the afternoon ceremony. After all students and their guests are seated, remaining seats will be available to the public. Shuttle buses will stop at various locations on campus, including Assembly Hall, from 9 a.m. to 6 p.m.

    69. The MIT Rad Lab Series
    24. James L. Lawson and george E. uhlenbeck. Threshold Signals, volume 24of MIT Radiation Laboratory Series. McGrawHill, New York, 1950. 25.
    http://web.mit.edu/klund/www/weblatex/node7.html
    The MIT Rad Lab Series
    After the end of World War II, the United States government continued to pay key people who had worked at the Radiation Laboratory for six months to enable them to write about their work. From the forward of each book: The tremendous research and development effort that went into the development of radar and related techniques during World War II resulted not only in hundreds of radar sets for military (and some for possible peacetime) use but also in a great body of information and new techniques in the electronics and high-frequency fields. Because this basic material may be of great value to science and engineering, it seemed most important to publish it as soon as security permitted. However, an altruistic drive to publish the Lab's achievements in open literature was not the only impetus. As C. C. Bissell observes: The imposing 27-volume [sic] Radiation Lab Series was not only a technological statement, but also a political statement about the role the United States was to play in the post-war world... that in the post-war world the United States would be the intellectual driving force of science and technology, as well as the economic and political super power. [ The most interesting volumes to control engineers are volumes 21 and 25. The

    70. Penrose Library, University Of Denver - Special Collections, Wolfgang Yourgrau C
    Translate this page ff 74. Correspondence Ulam, Stanislaw M. ff 75. Correspondence uhlenbeck,george E. ff 76. Correspondence Uppsala University. ff 77.
    http://www.penlib.du.edu/specoll/yourgrau/wygd.html
    Wolfgang Yourgrau Collection Special Collections / Archives
    Box 1: Correspondence A-G
    Box 2: Correspondence H-M
    Box 3: Correspondence N-V
    Box 4: Correspondence W-Z; Biographical Materials; Lectures
    Box 5: Manuscript Drafts
    Box 6: The Orient
    Box 7: Class Notes
    Box 8: Class Notes
    Box 9: Personal Library; Publications; Photos and other items
    Box 10: Pictures (framed) Box 11: Objects Bag 1: Academic Regalia BOX 1: Correspondence A-G ff 1 Correspondence: Aaron, Daniel ff 2 Correspondence: Akder, Henry L ff 3 Correspondence: Alexander, Peter ff 4 Correspondence: Alfven, Hannes ff 5 Correspondence: Alter, Chester ff 6 Correspondence: Alpher, Ralph A. ff 7 Correspondence: Alvarez, Luis W. ff 8 Correspondence: Amherst College ff 9 Correspondence: American Colleges and Universities ff 10 Correspondence: Amme, Robert C. ff 11 Correspondence: Ayala, Francisco ff 12 Correspondence: Barnard, A.J.

    71. Prefacre
    Members from the American Physical Society Karl K. Darrow george uhlenbeck GeraldJ. Holton JH Van Vleck The President of the American Physical Society
    http://www.amphilsoc.org/library/guides/ahqp/preface.htm
    PREFACE We are products of the past and we live immersed in the past which encompasses us. How can we move toward new life, create new activities without getting out of the past-without placing ourselves above it? There is no other way out: except through thought which does not break off relations with the past but rises ideally above it and converts it into knowledge. . . Only historical judgment liberates the spirit from the pressure of the past; it maintains its neutrality and seeks only to furnish light-it alone makes possible the fixing of a practical purpose; opens a way to the development of action. Benedetto Croce Attendees, Solvay Institute, 1927 This volume catalogs materials on the history of quantum physics and related developments in theoretical physics. Many of these source materials now stand ready for use in depository libraries at Berkeley, Copenhagen, and Philadelphia. Professor Kuhn and his colleagues detail here what the source materials are and what they contain. They tell in addition of their intensive three-year work at collecting these materials. Not only did they secure letters, manuscripts, notebooks, and personal commentaries before loss or destruction; they also interviewed more than ninety men and women closely connected with the history of quantum physics and recorded and transcribed these interviews. Never in the history of science has so effective an effort been made to record decisive moments in the evolution of new ideas while key participants are still alive.

    72. 4/17/00
    A professor of mathematics at the University of Texas at Austin, uhlenbeck will receivean Applied Life Studies 4 pm, 100 george Huff Hall, 1206 S. Fourth St
    http://www.news.uiuc.edu:16080/archives/00.04/17commen.html

    73. Discovery Of Electron Spin
    This photograph was taken around 1928 in Ann Arbor, three years after george uhlenbeck(left) and Samuel Goudsmit (right) proposed the idea that each electron
    http://www.lorentz.leidenuniv.nl/history/spin/spin.html
    This photograph was taken around 1928 in Ann Arbor, three years after George Uhlenbeck (left) and Samuel Goudsmit (right) proposed the idea that each electron spins with an angular momentum of one half Planck constant and carries a magnetic moment of one Bohr magneton. At the time of their discovery, Uhlenbeck and Goudsmit were studying in Leiden with Paul Ehrenfest. At the center is Hendrik Kramers, another of Ehrenfest's students. The discovery note in Naturwissenschaften is dated 17 October 1925. One day earlier Ehrenfest had written to Lorentz to make an appointment and discuss a "very witty idea" of two of his graduate students. When Lorentz pointed out that the idea of a spinning electron would be incompatible with classical electrodynamics, Uhlenbeck asked Ehrenfest not to submit the paper. Ehrenfest replied that he had already sent off their note, and he added: "You are both young enough to be able to afford a stupidity!" Ehrenfest's encouraging response to his students ideas contrasted sharply with that of Wolfgang Pauli. As it turned out, Ralph Kronig, a young Columbia University PhD who had spent two years studying in Europe, had come up with the idea of electron spin several months before Uhlenbeck and Goudsmit. He had put it before Pauli for his reactions, who had ridiculed it, saying that "it is indeed very clever but of course has nothing to do with reality". Kronig did not publish his ideas on spin. No wonder that Uhlenbeck would later refer to the "luck and privilege to be students of Paul Ehrenfest".

    74. Goudsmit On The Discovery Of Electron Spin
    Today I will talk a little about history. The history of the discoveryof the electron spin by george uhlenbeck and myself. That
    http://www.lorentz.leidenuniv.nl/history/spin/goudsmit.html
    The discovery of the electron spin
    S.A. Goudsmit
    The golden jubilee of the Dutch Physical Society in April 1971 was concluded with a lecture by Samuel Goudsmit on the history of the discovery of the electron spin. Actually, his could hardly be called a polished lecture; it was a grandiose artistic performance, full of wit and emotional involvement. Goudsmit, then at the end of his scientific career, gave a very personal account of how chance and the guidance by Ehrenfest, their far-sighted supervisor, led him and Uhlenbeck to formulate their remarkable discovery. When, in connection with the present book , the question turned up how to discuss the early history of electron spin, my thoughts returned to that day, nearly twenty five years ago, when I had been impressed by Goudsmit's truly humane wisdom. After weighing various alternatives I thought: why not let the master speak for himself? Thus I came to translate Goudsmit's historic lecture. Its text was not meant to be published as a paper, but Goudsmit subsequently consented to its publication from a tape recording . Apart from a few minor changes I have tried to present Goudsmit's very personal style by giving a literal translation of the words spoken in Dutch. A number of references to the papers mentioned by Goudsmit have been added. J.H. van der Waals

    75. FAQs History Of MRI
    nuclear spin. The year after, george Eugene uhlenbeck and Samuel A.Goudsmit introduced the concept of the spinning electron. Two
    http://www.emrf.org/FAQs MRI History.html
    Information + Education
    on the Web
    FAQs
    Frequently asked questions A SHORT HISTORY OF MAGNETIC RESONANCE IMAGING FROM A EUROPEAN POINT OF VIEW Like any history, the history of MR imaging has no real beginning. There is no exact date when somebody claimed to have invented an imaging method based upon the phenomenon of nuclear magnetic resonance. Jean-Baptiste-Joseph Fourier The two scientists, Felix Bloch and Edward M. Purcell, were awarded the Nobel Prize in Physics in 1952. Felix Bloch and Edward M. Purcell Purcell was born in Illinois in the United States of America. He worked at the Massachusetts Institute of Technology, MIT, and later joined the faculty of Harvard University. Bloch was born in Zurich in 1905 and taught at the University of Leipzig until 1933; he then emigrated to the United States and was naturalized in 1939. He joined the faculty of Stanford University at Palo Alto in 1934 and became the first director of CERN in Geneva in 1962. In 1983 he died in Zurich. Bloch was a protagonist for the interaction between Europe and the United States. NMR and MRI would not exist without this interaction. Otto Stern and Isidor Isaac Rabi Cornelis Jacobus Gorter
    But there was another country in which major contributions to nuclear magnetic resonance were made. They originated in Kazan in Tatarstan, which was part of the Soviet Union at that time and is now an independent republic within Russia. Until recently, Russian contributions to NMR and radiology were frowned upon or not even discussed in the West.

    76. Other Research Projects Apollo Bioinformatics Materials Research
    Keynote speaker george uhlenbeck applauded the search for universal nonclassicalbehaviors fostered by the cross-disciplinary exchanges of the conference.
    http://hrst.mit.edu/hrs/renormalization/nbs273-intro/
    Other Research Projects: Apollo Bioinformatics Materials Research Molecular Evolution Physics of Scale Activities
    Critical Phenomena
    Proceedings of a Conference
    Held in Washington, D.C., April 1965
    (National Bureau of Standards Miscellaneous Document 273, December 1966)
    In April 1965 two hundred scientists from eleven countries met in Washington for what participant Cyril Domb later dubbed "the founding conference of critical phenomena." This appears to have been the first time that such a diverse array of specialists gathered under the single rubric of critical phenomena. In the Introduction PDF ) to the published proceedings, conference organizer Melville Green suggested four recent developments that helped motivate this ambitious undertaking: 1) Plausible theoretical predictions of non-classical phase transitions were finally extended successfully from two dimensions to three using painstaking series expansions. 2) The experimental demonstration that even classical fluids can exhibit sharp singularities in the specific heat at the critical point.

    77. Henry Russel Lectureship
    Raymond L. Wilder, Mathematics 1958 Verner W. Crane, History 1957 - Louis I. Bredvold,English Language Literature 1956 - george E. uhlenbeck, Physics 1955
    http://www.rackham.umich.edu/Faculty/hruslecture.html
    Information for Faculty Rackham Home Faculty Information Home
    Henry Russel Lectureship
    The Henry Russel Lectureship for 2005 General Information Eligibility
    Senior faculty with the rank of Professor may be nominated for the Henry Russel Lectureship. Departments and programs are encouraged to nominate women, minorities, and members of other groups historically underrepresented in their disciplines. N.B.

    78. Kari Enqvist Spin
    Hän ei ollut kaikkein ahkerin opiskelija, ja Ehrenfestillä oli toinenkin oppilas,joka aiheutti hänelle huolta. Hänen nimensä oli george uhlenbeck.
    http://www.physics.helsinki.fi/~enqvist/artikkeli.dir/dimensio.html
      SPIN AINEEN MERKILLINEN PERUSOMINAISUUS
      Vuosisatamme alkupuoliskolla aineen käyttäytyminen mikromaailman tasolla paljastui arkikokemukseen pohjaavan maalaisjärjen vastaiseksi. Aineen kvanttiteorian voittokulku onkin ollut yksi fysiikan suurimmista mullistuksista. Se toi fysiikkaan paitsi kvantittuneen atomin myös elektronin uuden, kummallisen ominaisuuden, spinin. Spinin historia alkaa itse asiassa sata vuotta sitten kun elokuussa vuonna 1896 nuori hollantilainen fyysikko Pieter Zeeman huomasi, että kun natriumliekki asetetaan voimakkaan sähkömagneetin napojen väliin, liekin säteilemät spektriviivat halkeavat. Jo vuonna 1862 englantilainen Michael Faraday oli yrittänyt vaikuttaa natriumhöyryn lähettämään valoon magneetilla, mutta tuloksetta. Faraday oli tehnyt kokeitaan lasiprismalla, mutta Zeemanilla oli käytössään tarkempi diffraktioprisma ja hän ajatteli, että jos suuri Faraday oli pitänyt koetta tärkeänä, kelpaisi se toistaakin. Pian viivojen halkeaminen tunnettiin "Zeemanin ilmiönä", ja tunnettu hollantilaisfyysikko H.A. Lorentz antoi sille selityksenkin: natriumin lähettämän valon lähde oli sen atomien sisällä liikkuvien ja englantilaisen J.J. Thomsonin 1897 löytämien elektronien värähtely. Zeemanin ilmiön selitystä jouduttiin odottamaan kaikkiaan miltei 30 vuotta. Jo varhaisessa vaiheessa oli ilmeistä, että viivojen jakautuminen totteli jotakin matemaattista lakia. Spektreissä havaittiin selkeitä säännönmukaisuuksia, mutta aina kun joku keksi säännön, joka oli pätevinään kaikille alkuaineille, joku toinen tuli ja havaitsi jälleen uuden viivan ja sen halkeilun, joka ei toteuttanutkaan tätä sääntöä. Kaiken kukkuraksi huomattiin, että kun magneettikenttä oli tarpeeksi suuri, jotakin merkillistä tapahtui. Pienillä magneettikentillä halkaistujen viivojen välinen etäisyys (eli niiden aallonpituuksien ero) suureni tasaisesti kenttää kasvatettaessa, ja aallonpituuksien suhteellinen ero näytti olevan aina jokin murtoluku. Mutta kun kenttää edelleen kasvatettiin, viivat alkoivat elää ja vaellella aivan uudella tavalla, ja hyvin suurilla kentillä koko efekti saattoi jopa hävitä.

    79. Harvey Mudd College Oral History Collection
    In 1925 he and george uhlenbeck, a fellow doctoral student at the University ofLeiden, discovered the electron spin, a fundamental contribution to quantum
    http://www.cgu.edu/hum/his/oralhis/hmc.htm
    top of page Welcome! User Notes Interview Citations Index of Names ... CGU History Dept. SUBJECT INDEX Aviation China Missionaries Project Citrus Industry Claremont Colleges Education Ethnic Studies Collection Harvey Mudd College Oral History Collection Industry Interviews conducted by CGU Doctoral Students Law Literature Migratory Labor History Movies and Theater Music and Photography Paris Expatriates Philosophy and Psychology Politics and Government Pomona College Oriental Study Expedition Scripps College Oral History Collection Southern California Bookmen Series Special Entries Women's Educational Politics World War II: Persecution and Uprising
    Jump to:
    Origins of the Atomic Age Project

    DAVENPORT, William H. (b.1908) Humanities and
    Social Sciences Chairmen
    Founding Faculty . 1990. 159 pages. Chaired the Humanities and Social Science Department from 1957 to 1968. From 1968 to 1973, he was the Willard W. Keith Fellow in Humanities. From 1973 to 1983. He taught part time as an emeritus professor. Here, Davenport discusses his early academic career, the designing of the Harvey Mudd curriculum and the role and funding of the humanities at Harvey Mudd, the college community and the growth of the college.
    Interviewer: Enid H. Douglass, Oral History Program.

    80. Endangered Languages: A Bibliography
    Sommer. 1991. Language death in Africa. In RH Robins and EM uhlenbeck(eds.), 1944. Broadwell, george Aaron. 1995. 1990 census
    http://www.linguistlist.org/el-page/publications/whaley.html
    Endangered Languages: A bibliography compiled by Lindsay Whaley
    Adelaar, William F. H. 1991. The endangered languages problem: South America. In R. H. Robins and E. M. Uhlenbeck (eds.), 45-91 Bamgbose, Ayo. 1993. Deprived, endangered, and dying languages. Diogenes 161.19-25. Bauman, James A. 1980. A guide to issues in Indian language retention. Washington, D.C.: Center for Applied Linguistics. Bernard, H. Russell. 1992. Preserving language diversity. Cultural Survival Quarterly 16.15-18. Bradley, David. 1989. "The disappearance of Ugong in Thailand". In N. Dorian (ed.), 33-40. Brenzinger, Matthias, ed. 1992. Language death: Factual and theoretical explorations with special reference to East Africa. Berlin, New York: Mouton de Gruyter. Brenzinger, Matthias, Bernd Heine and Gabriele Sommer. 1991. Language death in Africa. In R. H. Robins and E. M. Uhlenbeck (eds.), 19-44. Broadwell, George Aaron. 1995. 1990 census figures for speakers of American Indian languages . International Journal of American Linguistics 61.145-149. Brown, Robert McKenna. 1991.

    A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  

    Page 4     61-80 of 93    Back | 1  | 2  | 3  | 4  | 5  | Next 20

    free hit counter