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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 340 (1991), S. 377-384 
    ISSN: 1434-601X
    Keywords: 14.80.Pb ; 12.90.+b ; 23.20.Nx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The anomalous electron-positron coincidences observed in heavy-ion collisions have been interpreted as signal for the pair decay of hitherto unknown neutral objects with masses around 1.8 MeV. We discuss the decay modes of such extended composite particles when they are bound to a nucleus. In particular we investigate the angular correlation of the emitted pair and the competing single-photon decay channel. We confront the particle hypothesis with recent negative results from experiments searching for resonances in Bhabha scattering. The induced pair decay of a metastable 1++ state in secondary collisions with target atoms is discussed as a possible explanation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 349 (1994), S. 47-51 
    ISSN: 1434-601X
    Keywords: 13.40.−f ; 41.60.−m ; 14.80.Pb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The sharp electron-positron coincidences observed at GSI are still unexplained. One possibility quite often discussed, is that a new neutral particle might be produced due to a direct highly non-linear coupling to the strong electro-magnetic fields encountered in heavyion collisions. We show that this is no valid possibility as the momentum spectrum resulting from any such coupling is incompatible with the experimental observations.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 322 (1985), S. 539-545 
    ISSN: 1434-601X
    Keywords: 12.30.Cx ; 32.70.−n ; 11.30.Er
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a relativistic Hartree-Fock calculation of the parity violatingE1-matrixelement of the 6s↔7s transition in cesium. Our resultE1= −8.4·10−12 iea 0 for sin2 θ w = 0.22 is in good agreement with the experimental value. We also give a general discussion of the consequences of a violation of discrete symmetries for the solutions of the Dirac equation.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 2 (1971), S. 232-242 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The formation of austenite on the grain boundary in armcoiron. The austenite formed at the grain boundary of armcoiron showed hardening structure after annealing and quenching. The interpretation of the formation of austenite is possible by evaluation of the hardening structure. The areas of fracture resulting from the size and the distribution of the hardening structure is discussed. It is pointed out, that the area of fracture is a function of the size as well as of the distribution of the hardening structure.
    Notes: Der sich bei (Armco-)Eisen während der Glühung im α- + γ- Mischkristallgebiet an der Korngrenze gebildete Austenit zeigte nach dem Abschrecken Härtegefüge und entsprechende Härtewerte Ein Anlassen auf 500 °C führte zu einer Einformung des Zementits. Die Deutung der Austenitbildung ist nur indirekt über Rückschlüsse aus dem Härtegefüge, das bei Raumtemperatur untersucht werden kann, möglich. Die Wärmebehandlung beeinflußt auch Größe und Verteilung der Härtegebiete. Das Verformungsverhalten unterschiedlich wärmebehandelter Proben wird anhand von Aufnahmen, die mit einem Raster-Elektronenmikroskop gemacht wurden, besprochen.
    Additional Material: 31 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 148 (1937), S. 53-71 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 264 (1891), S. 152-160 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Synthesis of the hydroxyethyl-substituted poly(para-phenylene) 2b employing Suzuki polycondensation is described. This PPP derivative is used as a matrix for the attachment of first- and second-generation dendrons of the Fréchet-type with isocyanate functions at the focal point. The degree of coverage is determined from NMR integration to be virtually 100% in both cases.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 108 (1924), S. 332-340 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 306 (1960), S. 260-265 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A survey on the modifications of boron known today is given. Experiments are described for preparing boron crystals containing Be by decomposing BBr3 and BeBr2 on a hot tantal wire. Together with inhomogenous depositions on the surface of the wire, single-crystals of boron containing 0,1-0,5% Be have been isolated. The crystals have the tetragonal unit cell of β-boron
    Notes: Nach einem Überblick über die bisher bekannten Bor-Modifikationen werden Versuche beschrieben, durch gemeinsames Zersetzen von BBr3 BeBr2 am glühenden Tantaldraht Borkristalle mit eingelagertem Beryllium darzustellen. Neben inhomogenen Abscheidungen an der Drahtoberfläche, die Tantaldiborid enthielten, wurden Einkristalle isoliert, die nach spektralanalytischer Untersuchung 0,1-0,5% Be enthielten und auf Grund von Drehkristall- und Weißenbergaufnahmen die Kristallstruktur des tetragonalen Bor mit den Zelldimensionen a = 8,80 Å und c = 5,08 Å besitzen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 318 (1962), S. 304-312 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The conditions for preparing the Be-richest phase in the system Be/B are examined. The compound has the composition Be4B. The unit cell is tetragonal, space-group P 4/nmm, with 8 Be and 2 B atoms within the cell. The positions of the atoms are determined by two-dimensional FOURIER syntheses and refinement. The structure of Be4B is discussed with respect to the tendency of boron to share 8 electrons.
    Notes: Die Zusammensetzung der berylliumreichsten Phase des Systems Be/B wird zu Be4B bestimmt und ihre Darstellungsbedingungen und Struktur untersucht. Die tetragonale Elementarzelle enthält 8 Be- und 2 B-Atome. Raumgruppe ist P4/nmm. Die Atomlagen sind speziell und erfordern nur die Bestimmung von 3 z-Koordinaten, die durch zweidimensionale FOURIER-Synthesen und anschließende Verfeinerung ermittelt werden konnten. Die vorliegende Struktur läßt sich durch das Bestreben des Boratoms, durch Bindungsbeziehungen zu den benachbarten Be-Atomen ein Elektronenoktett zu erhalten, erklären.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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