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  • 1960-1964  (10)
  • 1
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zusammenfassung Die Beziehung zwischen der Mahldauer als Grad der mechanischen Behandlung und dem Energieinhalt von Festkörpern wurde kalorimetrisch durch Lösen in Wasser (NaCl) und durch Umsatz mit Salzsäure (ZnO) oder mit AgNO3-Lösung (Cu-Pulver) ermittelt. Im Zuge fortschreitender Mahldauer wechseln bei NaCl und ZnO Energiezunahme und Energieabnahme einander ab; die Beziehung Mahldauer — Energieinhalt enthält daher zahlreiche Maxima und Minima. Ähnlich verhält sich wahrscheinlich Cu-Pulver, dessen Energieänderung mit zunehmender Mahldauer nur bis nach Durchlaufen eines ersten stark ausgeprägten Maximums ermittelt werden konnte. — Die für Kochsalz festgestellte Abhängigkeit des Füllvolumens von der Mahldauer ähnelt derjenigen der Energieänderung. Seine Oberfläche (B.E.T.) ändert sich ebenfalls nach einer wellenförmigen Funktion. — Diese Ergebnisse stützen die aus früheren Versuchen gewonnene Vermutung, daß in der Struktur von Feststoffen im Zuge fortschreitender mechanischer Behandlung Störungen und Ausheilungen erfolgen, durch deren Zusammenwirken diese wellenförmigen Eigenschaftsänderungen verursacht werden.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 51 (1964), S. 160-160 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 1 (1961), S. 85-100 
    ISSN: 1432-0533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary 5 cases of air embolism have been reported. Tissue changes, due to temporary closure of the vessels occurred chiefly as laminary or as infarctionlike elective neuronal necrosis, similar in their topography to lesions from temporary cerebral ischemia. Besides these changes, spots of pure demyelination, but without any neuronal damage, were present in the cerebral cortex and in the white matter of 3 cases. Their similarities to and distinctions from foci of multiple sclerosis and cortical demyelination in general paresis are discussed. Local edema following local injury of the vessel wall by mechanical or hypoxic conditions is supposed to be of pathogenic significance.
    Notes: Zusammenfassung Es wird an Hand von fünf einschlägigen Fällen darauf hingewiesen, daß bei cerebraler Luftembolie neben den von temporären Gefäßverschlüssen abhängigen, nekrotisierenden Vorgängen, die meist als laminäre oder infarktartige elektive Parenchymnekrosen in Erscheinung treten, relativ häufig auch “reine” Entmarkungsprozesse auftreten. Die Parenchymnekrosen ähneln in ihrer Topographie dem Schädigungsmuster bei temporärer cerebraler Totalischämie. Die davon unabhängigen, im Rindengrau und in der weißen Substanz liegenden Bezirke völliger und teilweiser Entmarkung lassen die Nervenzellen unberührt; Abbau und Organisation, die an einem Fall mit einer Manifestationszeit von 10 Wochen verfolgt werden konnten, vollziehen sich unter Produktion spärlicher Fettkörnchenzellen und gemästeter Astrocyten. Auf Ähnlichkeiten und Divergenzen mit den Herden bei multipler Sklerose und den Rindenentmarkungen bei progressiver Paralyse wird hingewiesen. Pathogenetisch sind lokale Ödeme in Betracht zu ziehen, deren Genese als lokaler Hypoxieeffekt oder Folge örtlicher Gefäßwandschädigung durch Gasembolie diskutiert wird.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1076
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Für eine Familie mit dominanter Vererbung des Acs-Syndroms werden serologische Koppelungsdaten für neun Markierersysteme bei insgesamt 11 Personen gegeben.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European archives of psychiatry and clinical neuroscience 200 (1960), S. 342-342 
    ISSN: 1433-8491
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    European archives of psychiatry and clinical neuroscience 204 (1963), S. 415-416 
    ISSN: 1433-8491
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 175 (1963), S. 430-439 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The broad photon spectrum of the Li7 (p,γ) Be8 reaction has been used to excite the 15·1 MeV 1+; 1 level in C12. The integrated scattering cross section of 1·82±0·12 MeV · mb has been determined by measuring the resonantly scattered photons and the primary radiation with the same NaI crystal. The peak absorption cross section of 28·9±3·3 barns has been obtained by minimizing the error of the integrated scattering cross section as determined from experiments with scatterers of different thickness. These results combine to give 40·2±5·2 eV for the ground state radiation width and 44·7±10·3 eV for the total width of the level. These widths are somewhat lower than previous reported results. The sharp 17·6 MeV radiation of the Li7(p,γ) Be8 reaction has also been used to measure elastic scattering cross sections for carbon, aluminium, cadmium and lead of 1·0±1·0 (μb, 16·1±3·7 μb, 2·2±0·2 mb and 5·2±0·5 mb respectively.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 170 (1962), S. 47-61 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differential cross sections have been measured for the small angle scattering ofγ-rays by iron, silver, tantalum, lead and uranium with 17 MeV photons from Li7 (p, γ) Be8 at mean four momentum transfersq of 0·5mc and 1·3mc and with 7 MeV photons from F19(p, αγ)O16 at mean four momentum transfer of 0·5mc. Under these experimental conditions only Compton, Rayleigh and possibly Delbrück scattering are of importance. Extrapolation of known theoretical results to higher energies shows, that Rayleigh and Compton scattering from bound electrons should depend only onq for small angles, smallq and fixedZ. Using this it follows, that at 17 MeV andq≈0·5mc an additional scattering process must be present, which increases with growingZ and which is negligible in the measurements at 17 MeV withq≈1·3mc and at 7 MeV withq≈0·5mc. These results are in qualitative agreement with the approximate theory for Delbrück scattering ofBethe andRohrlich, however experimental cross sections at 17 MeV andq≈0·5mc are about a factor of 1·6 lower than those predicted by this theory. This discrepancy is not unexpected, since exact calculations of Delbrück scattering amplitude fromKessler andZernik at 2·62 MeV and 6·14 MeV show even greater deviations in the same sense.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 331 (1964), S. 129-132 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Immediately after its preparation, graphite oxide is only slightly coloured. Its darkening under the influence of light is caused by decomposition; CO and CO2 are formed already at room temperature.
    Notes: Die Dunkelfärbung des frisch hergestellten, hellen Graphitoxids bei Lichteinwirkung beruht auf einer Zersetzung. Schon bei 20°C werden CO und CO2 entwickelt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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