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  • 1
    Electronic Resource
    Electronic Resource
    Low-temperature photochromic response of gallium-doped bismuth germanium oxide (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3974-3978 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gallium is one of several dopants that electronically compensate the deep donor responsible for the yellow coloration observed in bismuth germanium oxide (BGO). A series of Ga-doped BGO crystals were grown using the Czochralski method to confirm the formation of a trapped hole center following exposure to near band edge light at low temperatures. The deep donor absorption shoulder disappeared for Ga concentrations in the 3%–4% (melt) range. Excitation at 10 K with 3.3 eV light produces photochromic absorption bands. For low gallium concentrations the photochromic bands were the same as the ones observed in undoped BGO. For concentrations of 4% or more the photoinduced absorption consisted of overlapping bands at 1.1, 1.55, and 2.45 eV. These bands grew uniformly with exposure time and annealed together in the 100–120 K temperature range. By comparison with earlier results on Al-doped BGO and bismuth silicon oxide (BSO), we believe that the 1.1 eV band in BGO:Ga and the 1.0 eV band in BGO:Al (and BSO:Al) are due to trapped hole centers ([GaO4]0 and [AlO4]0, respectively).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352862
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  • 2
    Electronic Resource
    Electronic Resource
    The low-temperature photochromic response of bismuth silicon oxide (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1443-1448 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Exposing the photorefractive material bismuth silicon oxide (BSO) at low temperatures to 2.4–3.3 eV light produces photochromic absorption bands. In undoped and Fe-doped BSO these bands appear to consist of a series of overlapping bands ranging from around 1.5 eV in the infrared to near the band edge. The infrared component is always weaker than the visible range contributions. The infrared portion anneals just above 100 K; in some samples this anneal is accompanied by the appearance of additional structure in the visible region. In undoped BSO the major anneal of the photochromic bands takes place above 200 K. If iron is present the photochromic bands are weaker and an anneal stage in the 120–150 K range appears. Bleaching with either 1.51 or 2.28 eV laser light uniformly lowered the photochromic bands in both undoped and Fe-doped BSO. In BSO:Al the aluminum electronically compensates the deep donor centers responsible for the yellow coloration observed in undoped crystals. At low temperatures, photoexcitation using near band-edge light produces the same overlapping bands at 1, 1.38, and 2.45 eV that were observed in BGO:Al. These bands anneal together between 80 and 100 K. The [AlO4]0 center which causes the coloration observed in smoky quartz is a plausible model for the photochromic bands in BSO:Al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353243
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  • 3
    Electronic Resource
    Electronic Resource
    121
Laser Speckle Perfusion Imaging of Wound Healing in a Porcine Model (2005)
    Oxford, UK; Malden, USA : Blackwell Publishing Ltd/Inc.
    Wound repair and regeneration 13 (2005), S. 0 
    Details
    ISSN: 1524-475X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A Laser Speckle Perfusion Imaging (LSPI) system has been developed to achieve rapid, high-resolution, noninvasive imaging of tissue blood flow. This study was designed to evaluate LSPI for monitoring dermal blood flow during the wound healing process in a well-established porcine model. Full-thickness excisional wounds (2 × 2 cm) were created on the dorsal skin of 11 juvenile female red Duroc pigs. The skin wounds were imaged weekly with the LSPI system until day 49 postwounding. Blood flow values for the wounds were normalized using the values from the surrounding healthy skin to account for variations in systemic perfusion from one scan date to the next. An average normalized perfusion value was obtained from the scans of all animals for each time point. Wound perfusion at the time of reepithelialization reached ∼165% of the surrounding skin (p 〈 0.001). This elevation in wound perfusion slowly and steadily decreased over time, until day 49 postwounding, at which time the values returned to normal. This trend toward decreased wound perfusion over time has previously been reported in human burn wounds using the LSPI instrument. Further, the LSPI data from this study and from other human studies correlates well with data generated using the more widely established Laser Doppler Imaging (LDI) technique. The faster scan time and higher resolution of the LSPI method provides a distinct clinical advantage, both in terms of patient comfort and for reliably matching perfusion characteristics to their associated anatomical features. The fast temporal response of the LSPI instrument could be used to monitor vascular responses to mechanical or pharmacological interventions to study dynamic vascular changes to damaged tissues. This study validates LSPI as a tool to measure blood flow in skin wounds and further supports the use of the juvenile female pig as a model of excisional wound healing, yielding results comparable to healing in humans.Acknowledgments:  Funding provided by CIHR, AHFMR, and NSERC
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1067-1927.2005.130216y.x
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  • 4
    Electronic Resource
    Electronic Resource
    THE NATURE OF THE TUBEROSE FLESHY MOLE (1902)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 1 (1902), 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.1471-0528.1902.tb10539.x
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  • 5
    Electronic Resource
    Electronic Resource
    CASE OF FULL-TIME INTACT EXTRAPERITONEAL GESTATION SUCCESSFULLY REMOVED AFTER FIVE YEARS’ RETENTION. (1902)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 1 (1902), 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.1471-0528.1902.tb10518.x
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  • 6
    Electronic Resource
    Electronic Resource
    OBSTETRICS AT THE BEGINNING OF THE TWENTIETH CENTURY: AN ATTEMPT AT AN APPRECIATION (1902)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 1 (1902), 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.1471-0528.1902.tb10511.x
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  • 7
    Electronic Resource
    Electronic Resource
    The variation in cervical hydroxyproline and cervical water with age (1988)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 95 (1988), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. The squamocolumnar junction is frequently not visible in the postmenopausal patient. This study attempts to identify some of the changes in the cervix that may account for this observation. Twentyfour cervical biopsy samples taken at the squamocolumnar junction were analysed for hydroxyproline (collagen) and water content. There was significantly more hydroxyproline (collagen) in the premenopausal woman than the postmenopausal woman. Similarly, there was higher percentage of water in the biopsies in the premenopausal woman than the postmenopausal woman. Further samples obtained deeper in the cervical stroma did not confirm these differences. It appears likely that differences in cervical water and cervical collagen near the surface of the cervix account, at least in part, for the lack of visibility of the squamocolumnar junction in the older woman.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1988.tb06794.x
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  • 8
    Electronic Resource
    Electronic Resource
    Clear correlations observed between YBa2Cu3O7−δ thin-film properties and GHz microwave resonator performance (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1789-1791 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated and measured 5 GHz microstrip resonators from a series of YBa2Cu3O7−δ thin films grown on LaAlO3(001) substrates by in situ laser ablation. We have studied the correlations between unloaded quality factor and various film properties, such as transition temperature, width of transition, critical current density, narrowness of x-ray rocking curve, sharpness of electron channeling pattern, and most important substrate temperature during growth. We found that in general, higher transition temperature, higher critical current density, sharper transition, sharper channeling pattern, and narrower x-ray rocking curve correlate positively with good microwave performance. The best quality factor exists for a narrow growth temperature window (around 800 °C). We also report the dependence of quality factor on device power for each film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105092
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  • 9
    Electronic Resource
    Electronic Resource
    Lattice recovery of oxygen-implanted YBa2Cu3O7−δ superconductor (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 189-191 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The regrowth of an oxygen-implanted YBa2Cu3O7−δ thin film was studied by Rutherford backscattering, ion channeling, and x-ray diffraction studies. The atomic composition of the thin film was preserved even after a 1 h anneal at 990 °C, reflecting the high chemical stability of the material obtained by the pulsed laser deposition technique. Two distinct activation energies were determined during the regrowth process: 0.42±0.04 eV at lower temperatures, corresponding to epitaxial growth from the interface, and 0.18±0.03 eV at higher temperatures, presumably associated with homogeneous nucleation and reorientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104214
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  • 10
    Electronic Resource
    Electronic Resource
    Surface outgrowth problem in c-axis oriented Y-Ba-Cu-O superconducting thin films (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1557-1559 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The origin of surface outgrowths in c-axis oriented superconducting Y-Ba-Cu-O thin films has been identified. We find that a,b-axis regions nucleate heterogeneously at second phase regions and rapidly grow outward, leading to the formation of lenticular-shaped outgrowths. The second phase has been identified by electron diffraction and high-resolution electron microscopy to be the Y1Ba3Cu2O7−x phase that forms as microscopic platelet-shaped precipitates on the a-b plane. The heterogeneous nucleation of such outgrowths is general and has been observed in both in situ sputtered and laser-deposited films. It is probably related to the ledge growth mechanism of the c-axis oriented Y-Ba-Cu-O thin film and to the precise overall composition of the film and needs to be studied in detail in order to produce films with smooth surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105176
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