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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2675-2679 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We demonstrate the design and implementation of a fiber-optic-bundle beam delivery system for particle image velocimetry (PIV) applications. The system is designed for the transmission of high peak power pulses ((approximately-greater-than)20 mJ) from a Q-switched and frequency doubled Nd:YAG laser. A fiber bundle offers advantages over a single fiber in beam delivery systems for light sheet formation. The damage-limit-maximum power that can be transmitted is greater for the bundle than for any of its component fibers, and the quality of the derived light sheet is higher than that obtainable from a single large core fiber of power handling capacity equivalent to that of the bundle. The beam delivery system was demonstrated in PIV measurements on a premixed propane-air flame. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1523-5378
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 137 (1997), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The pathogenesis of psoriasis appears to depend on T cells, which have been proposed to mediate the disease through an autoimmune process. To test this hypothesis we have propagated four T-cell lines from biopsies of psoriatic skin lesions by antigen-independent methods. Flow cytometric immunophenotyping showed the lines to be composed mainly of CD4-positive, αβ-cell receptor (TCR)-positive cells, which secreted a cytokine profile suggestive of predominant T-helper type 1 (Th1) status. Analysis of TCR variable region (Vβ) usage revealed two- to eight-fold increases in the expression of certain Vβ species in lesional lines as compared with autologous peripheral blood mononuclear cells (PBMC), with the increased Vβ species being expressed on more than 5% of cells in two of the lines. Lines were also used to test for responses to a range of epidermal antigen preparations in the presence of irradiated autologous PBMC as antigen-presenting cells. The lines failed to proliferate in response to psoriatic lesional stratum corneum extracts, dispase-separated normal human epidermal extracts, and an epidermal keratin preparation before and after trypsinization, in spite of good proliferative responses to anti-CD3 which indicated that the lines were not anergic. In addition, the lines and PBMC from normal volunteers and the patients with psoriasis gave little or no response to recombinant streptococcal M protein. Thus, in spite of accumulating evidence for selective expansion of certain Vβ-expressing T cells in psoriatic lesions, epidermal autoantigens have not been identified by using a bioassay which depended largely on the proliferation of lesional CD4-positive cells. The role of streptococcal M protein, which bears some homology with epidermal keratin is also open to question, at least in chronic plaque psoriasis. Further work is therefore required to obtain direct evidence that autoimmune processes are important in the pathogenesis of chronic plaque psoriasis.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A prospective, open, multicentre study was performed to investigate the efficacy and safety of longterm treatment with cyclosporin in adults with severe atopic dermatitis. Subjects were treated for a maximum of 48 weeks. For the first 8 weeks, cyclosporin was administered at 2.5 mg/kg per day. The dose was then adjusted according to response. Disease activity was monitored using the six-area. six-sign score and the proportion of skin involved. Pruritus and sleep disturbance were assessed using four-point scales. Response was further evaluated on a five-point scale. Adverse events. blood pressure and serum biochemistry were monitored. Tolerability was assessed on a five-point scale.One hundred subjects were enrolled and 65 completed 48 weeks of treatment. Withdrawals occurred due to remission (three), inadequate response (seven), protocol violations (11) and adverse events (14, of which seven were probably treatment related). Cyclosporin produced rapid and highly significant improvements in all indices of disease activity. Sixty-five subjects considered that they had shown a considerable improvement or complete clearance of disease. Most patients relapsed after cessation of treatment. but neither signs nor symptoms had returned to baseline severity 8 weeks later. Blood pressure and serum creatinine levels increased slightly. and in one subject renal impairment was a major factor contributing to withdrawal of the drug. Overall, 85 subjects rated the tolerability of cyclosporin as good or very good.The results indicate that cyclosporin has a place in the long-term treatment of severe atopic dermatitis provided that appropriate patients are selected and careful monitoring is performed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A 1 year, prospective multicentre study was performed to investigate the efficacy and safety of intermittent treatment with cyclosporin in psoriasis vulgaris. Subjects received cyclosporin (Neoral(r)) 5mg/kg per day until achieving 90% reduction in area affected, or for a maximum of 12 weeks. Those failing to demonstrate a satisfactory response were withdrawn. When further treatment was required, cyclosporin was recommenced. This cycle was repeated up to three times. Psoriasis activity was recorded using the area affected and sign scores for erythema, scaling and infiltration. Overall assessments of response and tolerability were recorded.Forty-one subjects, mean age 36, mean PASI 12·8, entered the first treatment period. Thirty-three received a second period of treatment and 16 a third. Eighteen failed to complete the study as planned: five were withdrawn due to adverse events, four due to treatment failure and nine due to protocol violations. At the end of each treatment period, significant improvements were seen in all efficacy parameters. Overall response was graded as ‘considerable improvement’ or ‘minimal or no symptoms’, by over 80% of subjects and investigators. Median intervals to relapse for subjects remaining in the study were 72 days (range 28–329) and 53 days (range 14–141) after periods 1 and 2, respectively.There were significant increases in mean serum creatinine and blood pressure during each treatment period. However, there were no significant differences in either parameter between baseline and the final follow-up visit. At the end of each treatment period, overall tolerability of the treatment was considered ‘good’ or ‘very good’ by over 80% of subjects and investigators.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 3029-3036 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A set of experiments was conducted to determine the origin of residual stresses in amorphous Al2O3 films formed by ion beam assisted deposition. Samples were deposited during bombardment by Ne, Ar, or Kr over a narrow range of energies, E, and a wide range of ion-to-atom arrival rate ratios, R. Films were characterized in terms of composition, thickness, density, crystallinity, microstructure, and residual stress. Film composition was independent of ion beam parameters and residual stress was independent of thickness over the range 200–1200 nm. Stress varied strongly with ion beam parameters and gas content. Residual stress and gas content saturated at a normalized energy of ∼20 eV/atom or an R of ∼0.05. Where residual stress varied linearly with RE1/2, results are consistent with an atom peening model, but saturation at high R or RE1/2 is inconsistent with such a model. Stress due to gas pressure in existing voids explains neither the functional dependence on gas content nor the magnitude of the observed stress. A probable explanation for the behavior of stress is gas incorporation into the matrix, where the amount of incorporated gas is controlled by trapping. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 2524-2532 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated that an AT-cut quartz crystal driven in the thickness-shear-wave mode and typically used as a sensor to monitor the viscoelastic shear-wave properties of a fluid also produce longitudinal pressure waves. Unlike the shear wave, these waves are capable of long-range propagation through the fluid and of reflection at its boundaries, notably at an outer fluid–air interface. They introduce a component into the measured electrical impedance and resonance frequency shift of the crystal, which reflects the setting up of cyclic pressure-wave resonances in the fluid. This has important implications for the practical employment of these crystal as sensors. Under appropriate conditions, as demonstrated for water and n-octane, it is possible to determine the propagating properties of sound waves in a fluid simultaneously with the viscoelastic shear-wave properties. These experiments are supported by an analysis of the appropriate hydrodynamic equations for waves in the crystal–fluid system, which predicts electrical characteristics in close agreement with those found experimentally. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 3333-3341 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature and frequency dependent smectic C bend (B1) and splay (B2) elastic constants and permittivities ε1, ε2, and ε3 have been measured directly for a commercial smectic C liquid crystal mixture. This has been achieved using continuum modelling to fit the ac field dependence of the permittivity in the C2U chevron geometry. The fitting procedure also makes use of measured values for the homeotropic permittivity, the layer tilt angle, and smectic cone angle. This approach removes many of the assumptions which were inherent in previous measurements giving improved accuracy in the results.
    Type of Medium: Electronic Resource
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