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  • 2000-2004  (2)
  • 1980-1984  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 1902-1908 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: X-ray photoelectron spectroscopy (XPS) was used to study the initial stages of surface oxidation of pseudomorphic Ni monolayers on Cu(111). Oxygen was adsorbed at 150 K followed by annealing the sample to 300 K and 600 K, respectively. For oxygen coverages between 0.4 ML and 2.0 ML we find little change in the peak shapes of the O 1s XPS signal. The Ni 2p3/2 spectra change, however, drastically: the onset of the oxidation is marked by the appearance of a peak doublet shifted with respect to the peak of metallic Ni. Based on these spectra we find a minimum oxygen coverage of 0.7 ML necessary for the onset of oxidation. The oxidation is nearly complete after the adsorption of about 2.0 ML oxygen. The exposure of different Ni coverages (0.5–2.0 ML) to oxygen shows that oxidation takes place only in the top-most Ni layer. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Based on histopathological examination of 264 exocrine pancreatic tumours (167 autopsy and 97 surgical) from the files of the Institute of Pathology, University of Hamburg, over a 15-yr period (1966–1980), a histogenetic classification is proposed. In addition to the more common neoplasms this also includes rarer and more recently defined entities. Of the 264 tumours, 250 were of duct origin, 10 acinar and four of uncertain histogenesis. Ductal adenocarcinoma, subdivided into a well-differentiated and a poorly-differentiated type, was most frequent (81.1%), followed by its variants: pleomorphic giant cell carcinoma 5·3%, adenosquamous carcinoma 3·8%, and mucinous carcinoma 1.1%. All these had a poor prognosis. Serous cystadenoma (1.1%), mucinous cystic tumour (1.5%) and intraductal papilloma (0.8%), which were rare tumours and mostly apparent in surgical material, proved to be benign or of only latent malignancy. The group of tumours of acinar cell origin consisted of the solid and cystic tumour (2.7%) with favourable prognosis and the acinar cell carcinoma (1.1%). No pancreatoblastoma was observed. The pleomorphic carcinomas of the small cell type (1.5%) were classed as tumours of uncertain histogenesis.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1501-1503 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Macroscopic quantum tunneling imposes an upper limit on the areal density of magnetic disk drives. We derive a general expression for this limit, and apply it to Co-alloy-based longitudinally recorded media, as well as to potential future media based on the high anisotropy material FePt. We estimate the temperature at which the switching rate due to quantum tunneling becomes comparable to the thermally activated switching rate. This is the lowest temperature to which a magnetic storage device can be cooled with the expectation of increasing the areal density by enhancing stability against spontaneous switching. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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