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  • 1
    Electronic Resource
    Electronic Resource
    Heat capacity measurements of antiferromagnetic CoO/NiCoO superlattices (abstract) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6292-6292 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present heat capacity and magnetic measurements of antiferromagnetic (AFM) CoO/Ni0.5Co0.5O superlattices grown by reactive sputtering. X-ray data verify the structure and the high quality of the superlattice. Neutron-diffraction studies of similar superlattices have shown AFM ordering through several bilayers despite the short-range nature of the spin interaction in the constituent materials. We have recently developed a unique thin film microcalorimeter capable of measuring thin films from 1.5 K to well above room temperature, permitting specific heat measurements on these superlattices for the first time. Magnetic measurements were made by coupling the superlattices to a 30 nm Ni81Fe19 overlayer and measuring the temperature dependence of the exchange anisotropy field. We examine the effect of exchange coupling at the interfaces by varying the thickness of the bilayers and their constituents. When the layers of the CoO/Ni0.5Co0.5O superlattice are thin, we observe a single broad heat capacity peak at a temperature between the Néel temperatures of bulk CoO and Ni0.5Co0.5O. This peak is at a temperature that corresponds to the superlattice magnetic blocking temperature, the temperature at which the exchange field goes to zero. For thicker layers, we observe the disappearance of the superlattice peak, and the emergence of two broad peaks close to the individual Néel temperatures of CoO and Ni0.5Co0.5O. We compare the temperature dependence of the specific heat of the superlattices to various models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358311
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  • 2
    Electronic Resource
    Electronic Resource
    Lanthanum-substituted Y-Ba-Cu-O superconductors synthesized at elevated oxygen pressures (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 715-717 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lanthanum substitution in the Y-Ba-Cu-O system at elevated P(O2) results in superconducting compositions which throw interesting light on the effects of nonisovalent substitution in a Y-Ba-Cu-O system. Like Ca substitution, La substitution also shifts the phase formation boundary between 123, 247, and 124 phases to higher P(O2), and stabilizes a tetragonal 123 structure at moderately elevated P(O2). However, in contrast with Ca substitution, Tc decreases continuously and rapidly with increasing La content. This can be only partly explained by a decrease of the hole concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104257
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  • 3
    Electronic Resource
    Electronic Resource
    Electromyographic study of the mechanism of postoperative cholangitis in congenital biliary atresia (1990)
    Springer
    Pediatric surgery international 5 (1990), S. 433-436 
    Details
    ISSN: 1437-9813
    Keywords: Congenital biliary atresia ; Roux-en-Y biliary reconstruction ; Ascending cholangitis ; Intestinal motility ; Electromyographic analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cholangitis after biliary reconstruction for congenital biliary atresia is a troublesome postoperative complication. In order to clarify its mechanism and the changes in intestinal movement after biliary reconstruction by Roux-en-Y anastomosis, we performed electromyographic (EMG) studies of the motility of the reconstructed intestine in dogs. Monitoring the basic electrical rhythm (BER) and migrating myoelectric complexes (MMC), EMG analysis was carried out. As most of the Y-loop MMCs were propagated smoothly to the anal side, according to the continuity of the intestine, the intestinal contents were transported without stagnation. These intestinal movements appear to be useful as a biliary drainage route and to prevent ascending cholangitis. A comparison of short- and long-term intestinal motility after biliary reconstruction showed adaptation of the intestinal movement following the procedure. The outflow of bile appeared to accelerate intestinal motility because of prolongation of the MMC interval in the duodenum and oral jejunum without bile flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174343
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    Paper (German National Licenses)
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