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  • Springer  (40)
  • Nature Publishing Group  (3)
  • Oxford University Press
  • 1960-1964  (18)
  • 1950-1954  (25)
  • 1963  (18)
  • 1953  (25)
  • 1
    Electronic Resource
    Electronic Resource
    Quantenelektrodynamik bei nichtverschwindender Photonmasse (1963)
    Springer
    The European physical journal 172 (1963), S. 302-313 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Quantum electrodynamics with non-vanishing photon mass is written down in interaction representation. To apply the Wick decomposition formalism of theS-matrix one can introduce an indefinite metricη, similar to that of Gupta-Bleuler's quantum electrodynamics with vanishing photon mass. It will be shown that the complementary photons can be eliminated from the formalism with the help of the subsidiary condition. By a succeeding unitary transformation allx-singularities (x=photon mass) can be removed. The limiting processx→0, which then becomes possible, leads to the well-known so-called ‘reduced’ theory of quantum electrodynamics. A physical interpretation of this limiting process will be tried using, as a simple example, the radiation of an electric dipole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378044
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  • 2
    Electronic Resource
    Electronic Resource
    Photoprotonen aus Kohlenstoff, Stickstoff, Sauerstoff und Neon (1963)
    Springer
    The European physical journal 174 (1963), S. 337-350 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Zusammenfassung Ein CsJ(Tl)-Kristall-Spektrometer erwies sich in Verbindung mit Impulsformdiskrimination als geeigneter Detektor zur Messung der Energiespektren von Photoprotonen. Beim Sauerstoff und Neon konnten die Strukturen in der Energieverteilung der Protonen und der absolute Wirkungsquerschnitt der (γ, p)-Reaktion bestätigt werden. Die Messungen am Kohlenstoff ergaben im allgemeinen Verlauf ebenfalls Übereinstimmung mit den bisherigen Messungen. Die zahlreichen Strukturen im Photoprotonenspektrum des Stickstoffs lassen sich wegen der Vielfalt möglicher Reaktionskanäle noch nicht zuordnen.
    Notes: Abstract The energy spectra of photoprotons from carbon, nitrogen, oxygen and neon were investigated with 30·5 MeV bremsstrahlung of the Heidelberg betatron using a CsI(Tl)-spectrometer. The known resonances could be confirmed, new resonances are found in nitrogen. Yields and cross sections relative to those of the reaction C12(γ, n)C11 are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378607
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchung der Anregungszustände von Titan48 mit Hilfe der γ-γ-Winkelkorrelation (1953)
    Springer
    The European physical journal 135 (1953), S. 119-124 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Mit zwei Szintillationszählern und einem Koinzidenzkreis hohen Auflösungsvermögens wird an einem V48-Präparat die Anzahl derγ-γ-Koinzidenzen in Abhängigkeit vom Winkel, den die Emissionsrichtungen der koinzidierendenγ-Quanten miteinander bilden, gemessen. Durch Vergleich mit einer analogen Messung am Na22 gelingt es, den störenden Einfluß der Positronvernichtungsstrahlung zu beseitigen und die Winkelkorrelation derγ-γ-Kaskade des Ti48 zu erhalten. Diese Korrelation zeigt, daß der erste Anregungszustand des Ti48 den Spin 2, der zweite den Spin 4 besitzt und beide Übergänge durch Quadrupolstrahlung vor sich gehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333336
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  • 4
    Electronic Resource
    Electronic Resource
    Struktur und Mechanismus der negativen Gleitfigur einer Gleitentladung (1953)
    Springer
    The European physical journal 136 (1953), S. 262-284 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung An Hand von zahlreichen Photographien einer negativen Gleitentladung werden folgende charakteristischen Strukturmerkmale der Entladungsfigur erkannt. Die Primärfigur besteht aus getrennten Leuchtfäden, welche sich aufspalten und verästeln, sich gegenseitig ausweichen und unterdrücken. Der Mechanismus dieser Strukturen wird aus der Entwicklung der lokalen Feldverteilung in den Leuchtfäden gedeutet. Dieselbe Feldverteilung liegt in den Leuchtfädensystemen vor, welche die Funkenkanäle der späteren Entladungsstadien begleiten und erklärt die Ruckstufen mit sekundären und tertiären Büscheln, wie auch die Palmwedelstrukturen. Aus der Strukturanalyse kann auf die zeitliche Entwicklung der Entladung geschlossen werden, insbesondere ist die spätere Abzweigung von Funkenkanälen aus schon bestehenden Kanälen erkennbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325680
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  • 5
    Electronic Resource
    Electronic Resource
    Mikroanalyse von Eisen und Stahl. I. Silicium (1963)
    Springer
    Microchimica acta 51 (1963), S. 929-930 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01217619
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  • 6
    Electronic Resource
    Electronic Resource
    Libri novi (1963)
    Springer
    Mycopathologia 19 (1963), S. 342-352 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02052307
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of Cations on the Ninhydrin Reaction for the Determination of Amino-Acids (1953)
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 543-543 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The addition of 0-1 ml. of a M/100 solution of any of the cations, A13+, Hg2+, Fe2+, Fe3+, Mn2+, Sn2+, Ag+ and Cu2+, to a reaction mixture consisting of 10 [Lgm. alanine in 0-1 ml. water and 3 ml. of a 0-1 per cent solution of ninhydrin in n-butanol entirely abolished colour formation, which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/172543a0
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  • 8
    Electronic Resource
    Electronic Resource
    Doped Synthetic Diamonds—Anomalous X-ray Spikes Along 〈III〉 (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 167-168 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] So far we had observed no X-ray spikes in any synthetic diamond examined. Through the kindness of Drs. R. H. Wentorf and H. M. Strong of the General Electric Co., Schenectady, we have now had the opportunity of examining very small synthetic diamonds which have been doped with boron, aluminium and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199167a0
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  • 9
    Electronic Resource
    Electronic Resource
    Examination of Irregular Sub-surface Structures by Seismic Refraction Methods (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 1094-1095 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] One approach towards greater generality is that which has been discussed by Willmore, Scheidegger and Bancroft1'2 from which the postulate of plane stratification is eliminated. Instead of this, it is assumed that there is a surface in the ground below which the travel-time is a function of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1971094a0
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  • 10
    Electronic Resource
    Electronic Resource
    Die Konfiguration des Digoxigenins (1953)
    Springer
    Cellular and molecular life sciences 9 (1953), S. 253-254 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The missing members of the four stereoisomeric 3,12-dihydroxyetianic acid methyl esters and their diacetates were synthetized. The ester obtained by degradation of digoxigenin was identical with the 3β,12β-derivative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02172432
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