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Compositional distribution in the cross section of chemical-vapor-deposited Nb3Ge tape conductors and its correlation with superconducting properties (1987)

Nakagawa, Y. ; Yamasaki, H. ; Kimura, Y.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 61 (1987), S. 305-310

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Chemical-vapor-deposited Nb3Ge tapes 2.5 mm wide with Nb3Ge layer thickness of 5–60 μm were prepared under various processing conditions. Though the depth profile of the Nb concentration in the Nb3Ge tapes determined by x-ray microanalysis was fairly uniform, with a variation less than 4 at. % for many Nb3Ge tapes, the distribution of the Nb concentration over the whole cross section of the Nb3Ge layer varied considerably, with a variation of 10–18 at. % for various Nb3Ge tapes. In this distribution, Nb concentrations at the tape edges were found to be higher than those on its sides for all of the Nb3Ge tapes prepared. The origin of this singular distribution of the composition is discussed. The Tc values for narrower tapes cut out lengthwise from the 2.5-mm-wide tapes were measured resistively. They correlated closely with the compositional distribution in the cross section of the Nb3Ge tapes. The Tc values (midpoints) of Nb3Ge tapes incorporating compositions within the Nb concentration range of 70–75 at. % were found to be near or above 20 K.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.338821

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Expression of epithelial membrane antigen in perineurial cells and their derivatives (1987)

Perentes, E. ; Nakagawa, Y. ; Ross, G. W. ; [et al.]

Springer

Acta neuropathologica 75 (1987), S. 160-165

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ISSN: 1432-0533

Keywords: Epithelial membrane antigen ; Pacinian corpuscles ; Perineurial cells ; Perineurioma ; Neurothekeoma

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Paraffin-embedded surgical pathology specimens from skin (5) and muscle (2) biopsies, from Morton's neuromas (3), traumatic neuromas (8), schwannomas (21), neurofibromas (12), and from one perineurioma and one neurothekeoma were studied by immunoperoxidase histochemistry and antibodies against epithelial membrane antigen (EMA), Leu 7 epitopes (Leu 7), S-100 protein (S-100) and cytokeratins. Normal, reactive and neoplastic perineurial cells stain consistently for EMA, whereas Schwann cells express Leu 7 and/or S-100 positivity. None of the immunoreactive cells stained for cytokeratin. Our findings indicate that perineurial and Schwann cells can easily be distinguished by their different patterns of immunoreactivity with the above markers.