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  • 1
    Electronic Resource
    Electronic Resource
    Churg-Strauss disease: deterioration in a twin pregnancy. Successful outcome following treatment with corticosteroids and cyclophosphamide (1997)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 104 (1997), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1997.tb11991.x
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  • 2
    Electronic Resource
    Electronic Resource
    Mortality models for mountain and alpine ash
    Amsterdam : Elsevier
    Forest Ecology and Management 67 (1994), S. 319-327 
    Details
    ISSN: 0378-1127
    Keywords: Alpine ash ; Eucalyptus ; Mortality ; Mountain ash ; Stand ; cox regression
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0378-1127(94)90026-4
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  • 3
    Electronic Resource
    Electronic Resource
    Calcium ion transport through tissue discs of the cortical flesh of apple fruit (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 74 (1988), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Tissue discs cut from the cortical flesh of apple fruit (Malus domestica Borkh. ev. Granny Smith) were clamped between two chambers, and the transport of 45Ca2+ from one chamber to the other was followed. After initial transport associated with partial infiltration of air spaces by the Ca2+ -containing solution, steady-state transport rates were achieved over several hours. Transprt was by diffusion through the apoplast, faciliated by exchange with binding sites on the cell walls. Cation competition was observed during Ca2+ loading, transport and unloading, suggesting that the presence of other cations and pH will be important in modifying Ca2+ transport through non-vascular tissue and in xylem unloading. Modification of the extracellular volume of solution by vacuum infiltration increased Ca2+ transport at high concentrations, suggesting that diffusion is the prime motive force when Ca2+ is abundant. When low concentrations were infiltrated, there was little effect on Ca2+ transport, and exchange had a strong influence. Transport was reduced at 1°C but this could be accounted for by physical effects of low temperature on diffusion and viscosity. The results are discussed in relation to the nature of the apoplast and the transport of Ca2+ in non-vascular plant tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1988.tb02038.x
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  • 4
    Electronic Resource
    Electronic Resource
    Atomic ordering in molecular beam epitaxial InAsySb1−y natural strained layer superlattices and homogeneous layers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3593-3595 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transmission electron microscope studies were made of CuPt-type ordering in molecular beam epitaxial InAsySb1−y natural strained layer superlattices and homogeneous layers grown at temperatures in the range 295–470 °C. Ordering occurs with a maximum at a growth temperature of 370–400 °C, individual (1¯11) and (11¯1) ordered domains up to 10 nm in size are present, and there is a modulation of periodicity 3 d110 within the layers, where d110 is the (110) lattice spacing. The latter correlates with a [2×3] atomic surface reconstruction present during growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111208
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  • 5
    Electronic Resource
    Electronic Resource
    Geomagnetic induction in the Tasman Sea and electrical conductivity structure beneath the Tasman Seafloor (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 102 (1990), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: During the Tasman Project of Seafloor Magnetotelluric Exploration recordings were made of the natural magnetic and electric field variations along a line of seafloor sites crossing the Tasman Sea. Using these data and additional magnetic field recordings made on the Australian continent the pattern of geomagnetic induction in the Tasman Sea Region is examined. An investigation of the seafloor magnetotelluric impedance tensor indicates the geomagnetic induction is influenced by the large-scale 3-D conductivity structure of the region. This result is confirmed by a study of impedance estimates obtained using the vertical gradient sounding method (in which the seafloor impedance is determined from the attenuation of the horizontal magnetic field variations through the ocean). Inversion of the E-polarization impedance component from sites in the central Tasman Sea indicates the conductivity structure at depths greater than about 100 km is laterally homogeneous in this region. It is probable that the conductivity structure at these sites includes a high-conducting layer similar to one observed in the Pacific Ocean. One seafloor site, lying on the Tasmantid Seamount Chain, exhibits an increased conductivity at depths of less than 100 km. The increased conductivity may be due to heating of the lithosphere by a hotspot, one proposed source of the seamount chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb04468.x
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  • 6
    Electronic Resource
    Electronic Resource
    Electromagnetic Mode Conversion By Surface-Conductivity Anomalies: Applications For Conductivity Soundings (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 117 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A natural-source electromagnetic sounding of the earth made near a surface conductivity anomaly will resolve different features of the underlying conductivity structure than a sounding in a more uniform region. the surface-conductivity anomaly deflects horizontal electric currents induced by an external source into a vertical plane converting transverse-electric (TE) mode currents into the transverse (TM) mode. the resulting current distribution involves both vertical current flow and spatial variations with shorter wavelengths than the external field, providing increased resolution of resistive layers and of the conductivity structure at shallow depths. We exmine the sensitivity of the converted-mode response for the vertical-gradient sounding (VGS) method in order to plan electromagnetic soundings in a narrow ocean strait such as the Strait of Georgia between Vancouver Island and the Canadian mainland.An integral-equation method is used to model the current system induced by a mode converter, consisting of a known conductivity structure, such as a body of ocean water. It is shown that the depth of penetration of the secondary current distribution produced by the mode converter depends on both the horizontal scale of the feature and the distance from its edge. Within this depth range the current system is strongly perturbed by the existence of either conductive or resistive layers. the sensitivity of the VGS response (the ratio of the horizontal magnetic field at the base and surface of the mode converter) is examined using forward modelling of layered conductivity structures. the response is found to be dependent on both the TE and TM current systems. For a narrow ocean strait such as the Strait of Georgia, a measurement of the converted-mode VGS response along a line of sites on the floor of the strait, will provide resolution of conductive and resistive layers in the upper 10 km. the appropriate frequency range over which the VGS response should be measured in the strait is 10−2 Hz to 10 Hz.In our investigation of mode conversion we examine both the frequency- and time-domain response. Snap shots showing the current system evolving in the earth after a step or impulse illustrate the interaction of the EM signals with resistive and conductive layers. We show that the time-domain response can be used in a ‘geometrical sounding’analogous to seismic refraction to determine the conductivity structure. Finally we examine the limitations on the accuracy of the frequency and time-domain VGS response imposed by natural signal levels and instrument sensitivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03303.x
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  • 7
    Electronic Resource
    Electronic Resource
    Transmission electron microscopy and transmission electron diffraction structural studies of heteroepitaxial InAsySb1−y molecular-beam epitaxial layers (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 8227-8236 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Molecular-beam epitaxy InAsySb1−y layers were grown at temperatures ranging from 295 to 470 °C across the full composition range. Transmission electron microscopy and transmission electron diffraction (TED) examinations showed that for layers grown at and below 400 °C with nominal compositions 0.4〈y〈0.8, separation into two phases occurred resulting in a series of alternating plates approximately parallel to the layer surface. TED showed that the cubic lattices of the two phases were tetragonally distorted and their compositions were deduced to be typically InAs0.38Sb0.62 and InAs0.72Sb0.28. The plates were larger and more regular along the [1¯10] direction than the [110] direction. As the growth temperature increased from 295 to 400 °C, for layers of nominal composition InAs0.5Sb0.5, the plate length increased from 0.1 to 2.0 μm and the plate thickness from 10 to 50 nm. Crystallographic defects were present in the layers and their occurrence was different in the phase-separated and non-phase-separated layers. The plates formed spontaneously at the growing surface and were stable during subsequent annealing at 350 and 370 °C. It is suggested that they arise due to the presence of a miscibility gap at these growth temperatures. We have termed these spontaneously grown plate structures "natural'' strained layer superlattices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353440
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  • 8
    Electronic Resource
    Electronic Resource
    The molecular beam epitaxial growth of InSb on (111)B GaAs (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 215-217 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The molecular beam epitaxial growth of InSb on (111)B GaAs has been investigated. It was found that for a given Sb/In ratio, a higher growth temperature was required for the growth of InSb on (111)B GaAs compared to that on (001) GaAs. This difference has been attributed to the bonding characteristics of the (111)B and (001) surface. Once growth had been optimized, it was found that the material characteristics of (111)B InSb were almost identical to that of (001) InSb, i.e., independent of orientation. For example, the x-ray full width at half-maximum and 300 K mobility had the same absolute values for (111) InSb and (001)InSb and followed the same dependence with the sample thickness. Te was found to be a well-behaved n-type dopant for (111)B InSb. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117376
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  • 9
    Electronic Resource
    Electronic Resource
    High quality AIN and GaN epilayers grown on (00⋅1) sapphire, (100), and (111) silicon substrates (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2958-2960 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The growth of high quality AlN and GaN thin films on basal plane sapphire, (100), and (111) silicon substrates is reported using low pressure metalorganic chemical vapor deposition. X-ray rocking curve linewidths of about 100 and 30 arcsec were obtained for AlN and GaN on sapphire, respectively. Room-temperature optical transmission and photoluminescence (of GaN) measurements confirmed the high quality of the films. The luminescence at 300 and 77 K of the GaN films grown on basal plane sapphire, (100), and (111) silicon was compared. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114242
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  • 10
    Electronic Resource
    Electronic Resource
    Molecular beam epitaxial growth of high quality InSb (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 3338-3340 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this letter we report on the growth of high quality InSb by molecular beam epitaxy that has been optimized using reflection high energy electron diffraction. A 4.8 μm InSb layer grown on GaAs at a growth temperature of 395 °C and a III/V incorporation ratio of 1:1.2 had an x-ray rocking curve of 158 arcsec and a Hall mobility of 92 300 cm2 V−1 at 77 K. This is the best material quality obtained for InSb nucleated directly onto GaAs reported to date. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112384
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