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  • 1
    Electronic Resource
    Electronic Resource
    Formation of superconducting (Tl,Bi)Sr2CaCu2Oy thin films by rf sputtering and thallium diffusion (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2135-2137 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have prepared new high Tc superconducting thin films of (Tl,Bi)-Sr-Ca-Cu-O by combining low temperature (500 °C) rf sputtering of Bi-Sr-Ca-Cu-O precursor films and thallium diffusion. A typical film has Tc(onset) =80 K, Tc(midpoint) =79 K, and Tc(zero) =50 K. X-ray diffraction and energy dispersive spectroscopic studies were carried out to determine the composition and crystal structure of the superconducting phase within the film. We identified a material with the chemical composition of (Tl0.7 Bi0.3 )Sr2CaCu2Oy and tetragonal symmetry (a=3.795 A(ring) and c=12.095 A(ring)), and propose that this phase is responsible for superconductivity around 80 K. The film also has a highly preferred orientation with the c axis perpendicular to the surface of the (100)MgO substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103236
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  • 2
    Electronic Resource
    Electronic Resource
    In situ low-temperature deposition and properties of Bi(Pb)-Sr-Ca-Cu-O thin films prepared by magnetron sputtering (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1371-1373 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting thin films of the Bi-Sr-Ca-Cu-O system with and without lead doping were prepared by rf magnetron sputtering onto (100)MgO substrates. Although the superconducting properties of the thin films are very sensitive to the deposition and soak temperatures, reproducible results were obtained. Our in situ deposition process with processing temperatures not exceeding 600 °C yielded films with zero resistance at 82 K and Jc=7×105 A cm−2 measured at 4 K for the two-layer Bi phase. Our initial results with lead-doped Bi-Sr-Ca-Cu-O thin films will also be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102517
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  • 3
    Electronic Resource
    Electronic Resource
    Fabrication of a novel electro-optical intensity modulator from the conjugated polymer, poly(2,5-dimethoxy-p-phenylene vinylene) (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1519-1521 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report an electro-optic absorption modulator based around a metal-insulator-semiconductor field-effect transistor structure in which the active semiconductor is the polymer poly(2,5-dimethoxy-p-phenylene vinylene). It incorporates a single optical waveguide formed by the polymer, insulator, and a polyimide top layer which is ribbed to define the guide laterally. Charge injection creates polaron and bipolaron states which change the subgap absorption between 2 and 1.4 μm and between 800 nm and the band edge at 600 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108626
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  • 4
    Electronic Resource
    Electronic Resource
    Growth and properties of La2−xSrxCuO4 films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2481-2483 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-crystalline films of La2−xSrxCuO4 have been grown epitaxially on SrTiO3, NdGaO3, and LaSrAlO4 substrates by laser ablation. We show that record values of the superconducting transition temperature may be achieved by high-pressure annealing in oxygen. The films exhibit values of Tco above 38 K, as well as a linear variation of the resistivity with T and excellent crystal quality. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112671
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  • 5
    Electronic Resource
    Electronic Resource
    Early Events in the Activation of Plant Defense Responses (1994)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 32 (1994), S. 479-501 
    Details
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.py.32.090194.002403
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  • 6
    Electronic Resource
    Electronic Resource
    A reply (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 46 (1991), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1991.tb09756.x
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  • 7
    Electronic Resource
    Electronic Resource
    Williams syndrome: masseter spasm during anaesthesia (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 46 (1991), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A 4-year-old boy with Williams syndrome developed masseter spasm after halothane and suxamethonium. He did not develop malignant hyperthermia; the surgery was accomplished with a nontriggering anaesthetic and no further problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1991.tb09353.x
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  • 8
    Electronic Resource
    Electronic Resource
    The pathology of the posterior root ganglia in AIDS and its relationship to the pallor of the gracile tract (1992)
    Springer
    Acta neuropathologica 84 (1992), S. 163-170 
    Details
    ISSN: 1432-0533
    Keywords: AIDS ; HIV ; Posterior root ganglia ; Gracile tract pallor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The spinal cord and the thoracic and lumbar posterior root ganglia (PRGs) of 14 HIV-positive men and 7 age- and sex-matched controls were studied by routine histology, morphometric analysis of the number of nodules of Nageotte (nN) and the diameters of sensory ganglion cells, immunohistochemistry and in situ hybridization. In 7 patients (2 of whom had evidence of cytomegalovirus ganglionitis) there were increased numbers of nN and diffuse, mild infiltration with CD45R+ T lymphocytes; no B lymphocytes were observed. Macrophages were increased in number in all cases. Whenever more than one ganglion was examined from the same patient, the appearances were similar in all. There was no alteration in the distribution of ganglion cell diameters. Changes in the spinal cord included vacuolar myelopathy (5 cases), HIV myelitis (1 case), microglial nodules (3 cases) and pallor of the gracile tracts (GTP) in 7 cases, in 6 of whom it co-existed with increased numbers of nN. Seven cases had no abnormalities, except the increase in number of macrophages in PRGs. In spite of a correlation between sensory nerve cell loss and GTP our findings suggest that other mechanisms, such as ‘dying back’ may contribute to the pathogenesis of GTP. Moreover, sensory disturbances were found most commonly in association with nerve cell loss; however, loss of sensory ganglion cells was not necessarily associated with evidence of sensory impairment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00311390
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  • 9
    Electronic Resource
    Electronic Resource
    rCBF abnormalities detected, and sequentially followed, by SPECT in neuro-Behcet's syndrome with normal CT and MRI imaging (1992)
    Springer
    Journal of neurology 239 (1992), S. 363-366 
    Details
    ISSN: 1432-1459
    Keywords: Regional cerebral blood flow ; Neuro-Behcet's syndrome ; Computed tomography ; Magnetic resonance imaging ; Single photon emission tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Conventional imaging with computed tomography (CT) and magnetic resonance imaging (MRI) may show abnormalities in central nervous system Behcet's syndrome but is normal in some cases. Recently in two cases positron emission tomography has shown abnormalities in blood flow and glucose metabolism far more extensive than the abnormalities seen on CT and MRI scans in the same patients. We report a patient with neuro-Behcet's syndrome presenting with headache and personality change in whom CT and MRI brain imaging was normal, but regional cerebral blood flow imaging using single photon emission tomography with the tracer HMPAO showed extensive perfusion deficits which partially reversed after 3 months of prednisolone therapy. This technique may aid the diagnosis of cerebral involvement in Behcet's syndrome, although the cause and incidence of the perfusion deficits need further evaluation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00812151
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  • 10
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of the mean circulation around southern Africa (1991)
    Springer
    Theoretical and applied climatology 43 (1991), S. 161-174 
    Details
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Distributions through the year of temperature, geopotential height and specific humidity, and of their standard deviations, over southern African radiosonde stations are studied through harmonic analysis. Characteristics of annual and semi-annual cycles vary across the subcontinent as a result of thermal and mechanical effects induced by the land mass. Over the interior plateau temperatures and geopotential heights through to 100 hPa respond directly to solar heating of the surface and resultant seasonal changes in surface-at-mosphere heat fluxes. Around the coast temperatures and geopotential heights are additionally influenced by seasonally-varying ocean-atmosphere heat fluxes. Cycles of atmospheric moisture are dependent on properties of the low-level circulation rather than on temperature per se. The results demarcate the two inversions frequently located over the subcontinent and indicate that the local subtropical jet stream is displaced latitudinally on a semi-annual cycle, lying furthest south in February and August.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00867451
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