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  • 1975-1979  (3)
  • 1955-1959  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 6 (1975), S. 241-248 
    ISSN: 1432-0630
    Keywords: Surface analysis ; SIMS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The atomic mixing in the target under ion bombardment is assumed to result from cascades of atomic collision events. Computer simulations have been applied to collision cascades to estimate the depth resolution of surface analysis with an ion probe. The Monte Carlo method based on a single scattering model has been used mainly in the calculation under the assumptions of random collision process, no diffusion and no target saturation processes. High-energy collisions are characterized by a Lenz-Jensen or a Thomas-Fermi potential, while a Born-Mayer potential is used in the low energy region. The simulations have been performed for the bombardment of Ar ions withE 0=5 keV and 10 keV at angles of incidence θ=0° and 60° on Si targets. The depth resolutions [the definition of which is explained by (15) in the text] are about 140Å for the Lenz-Jensen cross section and about 80Å for the Thomas-Fermi one for θ=0° atE 0=5 keV, and decrease by 20–40% at θ=60° and increase by 70–90% forE 0=10 keV.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 62 (1958), S. 408-418 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Die Bildung von Streptolysin-S durch den Streptococcus haemolyticus wird durch Zugabe von Nucleinsäure gesteigert. Die hemmende Wirkung von hämolysierenden Streptokokken auf Ehrlich-Ascitescarcinom und Yoshida-Ascitessarkom ist dadurch zu erklären, daß die Keime auf Kosten der in den Tumorzellen enthaltenen Ribonucleinsäure Streptolysin bilden. Anderen Keimen (s. Tabelle 2) fehlt diese Eigenschaft. Auf einschlägige alte Beobachtungen an Menschen wird hingewiesen. Da chemische Stoffe, welche die Hämolysin-S-Bildung durch Streptokokken vermindern oder gar aufheben, dies dadurch tun, daß sie in den auch für das Wachstum der Tumorzellen wichtigen Ribonucleinsäure-Stoffwechsel eingreifen, wurde unter derartigen Stoffen nach anticancerös wirkenden Mitteln gesucht und ein sehr wirksames (Azo 106) gefunden.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 18 (1979), S. 425-426 
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The statistics of the sputtering process, which has been used to explain sputterbroadening effect due to surface roughness, has been treated with conditional probabilities. This results in the relationship, $${{\Delta z} \mathord{\left/ {\vphantom {{\Delta z} z}} \right. \kern-\nulldelimiterspace} z} \propto \sqrt {(1 + \overline \gamma )/z} $$ , instead of $${{\Delta z} \mathord{\left/ {\vphantom {{\Delta z} z}} \right. \kern-\nulldelimiterspace} z} \propto {1 \mathord{\left/ {\vphantom {1 {\sqrt z }}} \right. \kern-\nulldelimiterspace} {\sqrt z }}$$ derived by S. Hofmann [Appl. Phys.9, 59 (1976)], where δz,z, and $$\overline \gamma $$ are the depth resolution, sputtered depth and sputtering yield, respectively.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 6 (1975), S. 277-279 
    ISSN: 1432-0630
    Keywords: Surface analysis ; SIMS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The atomic mixing due to a knock-on cascade has much influence on the depth resolution of ion probe microanalysis. The preliminary experimental results support the assumption that the depth resolution due to this effect is determined by the competition of sputtering rate and creation rate of atomic displacement.
    Type of Medium: Electronic Resource
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