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  • 1965-1969  (160)
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  • 1
    Publication Date: 1965-10-15
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
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  • 2
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary For a description of the flow of rarefied gases, the gaskinetic transport equation is solved by means of bimodal two-stream distribution functions. The method is applied to the plane, compressible Couette flow problem. The solution is valid for the entire range of rarefaction, i.e. from continuum flow to free molecular flow. For the transition regime the description of the physical behavior of the gas is improved especially for large ratios of wall temperatures. It turns out for this case that, even for rather high Knudsen numbers, the flow properties are affected noticeably by molecular interactions.
    Notes: Übersicht Zur Beschreibung von Strömungen verdünnter Gase wird die Transportgleichung der Gaskinetik durch Ansätze mit bimodaler Zweistromverteilungsfunktion gelöst. Das Verfahren wird auf die ebene, kompressible Couette-Strömung angewendet. Die Lösung ist im gesamten Bereich der Verdünnung von der Kontinuumsströmung bis zur freien Molekülströmung gültig. Im Übergangsbereich wird das Verhalten des Gases besonders bei großen Wandtemperaturverhältnissen. besser als bisher beschrieben. Es zeigt sich hierfür, daß die Molekülwechselwirkung sogar bei recht großen Knudsen-Zahlen das Strömungsverhalten merklich beeinflußt.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Les quatrième et cinquième vertèbres lombaires sont prélevées post-mortem chez des sujets humains, âgés de 26 à 86 ans, et des échantillons de crête iliaque sont collectés simultanément pour établir histologiquement la densité des travées osseuses (index de la crête iliaque). Après avoir enlevé les pédicules et les apophyses épineuses, les vertèbres sont compressées dans une machine pour tester la résistance mécanique. Les valeurs suivantes sont déterminées: force de rupture (en poids par unité de surface au moment de la rupture), effort de rupture (en pourcentage de déformation) et contenu relatif en cendres (en cendres par unité de volume). L'effort de rupture est indépendant de la taille et de la force des vertèbres. Le contenu relatif en cendres et l'index de la crête iliaque sont en rapports étroits. Le contenu relatif en cendres et la force de rupture diminuent en fonction de l'âge, mais ce rapport n'est pas linéaire, car la force de rupture chute plus rapidement que le contenu en cendres. L'équation d'Euler pour une force courbe appliquée à une colonne chargée explique facilement comment, dans l'ostéoporose, la réduction de diamètre des travées verticales et la perte des attaches transversales sont responsables de la perte de force proportionellement plus élevée que la perte de tissu osseux. Les résultats ne permettent pas de supposer que, dans l'ostéoporose, la qualité du tissu osseux est altérée.
    Abstract: Zusammenfassung Die vierten und fünften Lumbalwirbelknochen wurden von Obduktionen menschlicher Leichen innerhalb der Altersgrenzen von 26 und 86 Jahren gewonnen. Gleichzeitig wurden Proben von der Beckenschaufel entnommen, um Maßstäbe für die Bälkchendichte festzulegen (Beckenschaufelzahl). Nach Entfernung der Ansätze und Dornfortsätze wurden die Wirbelknochen in einer Prüfungsmaschine komprimiert, um mechanisches Versagen zu bestimmen. Folgende Werte wurden erhalten: Bruchbelastung (Gewicht pro Einheitsfläche bei Bruch), Beanspruchung (Prozentsatz von Deformation) bei Bruch und relativer Aschegehalt (Asche pro Einheitsvolumen). Die Beanspruchung bei Bruch war unabhängig von Größe und Stärke der Wirbelknochen. Zwischen dem relativen Aschegehalt und der Beckenschaufelzahl bestand eine enge Verbindung. Der relative Aschegehalt und die Bruchbelastung wurden mit fortschreitendem Alter kleiner, jedoch war die Beziehung zwischen diesen beiden Faktoren nicht linear, da die Bruchbelastung rascher als der Aschegehalt abnahm. MitEulers Gleichung für die Verbiegungsbelastung einer geladenen Säule läßt sich leicht erklären, auf welche Weise bei der Osteoporose die Reduktion des Durchmessers der Wirbeltrabekeln und der Verlust der transversen Verbindungen einen verhältnismäßig größeren Stärkeverlust hervorruft, als durch Verlust von Knochengewebe erklärt werden kann. Die Ergebnisse geben keinen Anlaß zu der Vermutung, daß bei der Osteoporose die Qualität des Knochengewebes eine Veränderung erfährt.
    Notes: Abstract Fourth and fifth lumbar vertebrae were obtained at post mortem examinations of human subjects in the range 26 to 86 years and at the same time specimens were taken from the iliac crests for histological assessment of trabecular density (iliac crest score). After removal of pedicles and spinous processes the vertebrae were compressed in a testing machine to mechanical failure. The following values were obtained; breaking stress (load per unit area at failure), strain (percentage deformation) at failure and relative ash content (ash per unit volume). Strain at failure was independent of the size and strength of the vertebrae. The relative ash content and the iliac crest score were closely correlated. The relative ash content and the breaking stress both declined with increasing age, but the relation between them was not linear since the breaking stress fell more quickly than the ash content. Euler's equation for the buckling stress of a loaded column readily explains how in osteoporosis the reduction of the diameter of the vertical trabeculae and the loss of transverse ties cause loss of strength proportionately greater than the loss of osseous tissue. The results give no reason to suppose that in osteoporosis the quality of the osseous tissue is changed.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 196 (1966), S. 66-71 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of rainbow scattering, including supernumerary rainbows, the extrema in the velocity dependence of the total cross section and the oscillations in the differential cross section are used to evaluate the parameters of an−6 Lennard-Jones potential for the collision partners K-Hg.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A physical fractional parentage expansion is presented which can be used to treat the coupling of single-particle and core motion in terms of the physical eigenstates of the core. The antisymmetry requirement is formulated in a subsidiary condition which allows diagonalization of the coupling Hamiltonian in the product space of the core and the extra-core particle. Restriction to a subset of core excitations leads to only approximate fulfillment of the subsidiary condition. The usefulness of the method is tested in the quasi-spin model.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 185 (1965), S. 19-29 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differential cross section measurements for the scattering of K by Hg at thermal energies are reported. Rainbow angles are compared with literature data and agreement within 2% is found. The data indicate a departure of the rainbow cross section from the Airy integral approximation. The measured variation of the rainbow angle with collision energy cannot safely be explained by those intermolecular potentials for which numerical calculations are available.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The velocity dependence of total cross sections for the collision partners Cs-Hg, K-Hg, Xe, Kr, Ar has been measured in crossed beams. Except for Cs-Hg glory scattering oscillations were resolved. Invariably good agreement with theoretical predictions is found for the extrema velocities assumingn-6 potentials with 8≦n≦16 or exp-6 potentials with 10≦α≦18, for the amplitudes of the oscillations no fit is obtained. K-Hg, probably also K-Xe and K-Kr appear to deviate from theν −2/5 average velocity dependence expected for dipole-dipole interaction at large distances.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theβ + spectrum of22Na has been measured with the Heidelberg (π/2) √13 iron-freeβ-ray spectrometer. Particular attention was paid to the upper end of the continuum. The maximum energy was found to beE max=(545.7 ±0.5) keV. The rest mass of the neutrino connected withβ + decay was found to be zero with an upper limit of 4.1 keV (67 per cent confidence).
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Auswüchse menschlicher Placenten (12.–14. Woche Schwangerschaft) wurden in Organkultur gehalten. Obwohl sich die histologische Struktur langfristig erhalten lässt, bleibt ein dem menschlichen Wachstumshormon ähnliches Antigen, das in unkultiviertem Syncytiotrophoblast vorhanden ist, nur 10–14 Tage lang am Leben. Dasselbe erscheint vorübergehend in Cytotrophoblastzellen der Placentaauswüchse während der ersten 3 Monate.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 223 (1969), S. 925-928 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Wide variations in external exposure rates and a large number of radionuclides were found contributing to the residual radiation fields on Bikini ...
    Type of Medium: Electronic Resource
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