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  • 1
    Electronic Resource
    Electronic Resource
    Hole drift mobility measurements in amorphous silicon-carbon alloys (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2310-2315 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hole drift mobilities have been measured using photocarrier time-of-flight for several hydrogenated amorphous silicon-carbon alloy specimens. We find that, as the band gap increases, the hole drift mobility remains essentially constant. The temperature and dispersion properties were broadly consistent with hole multiple trapping in the valence bandtail. In conjunction with previous drift mobility measurements in hydrogenated amorphous silicon-carbon alloys and hydrogenated amorphous silicon-germanium alloys, these hole measurements complete a simple pattern for the effects of band gap modification on drift mobilities: electron mobilities decline as the band gap is increased or decreased from 1.75 eV, but hole mobilities are relatively unaffected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358508
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  • 2
    Electronic Resource
    Electronic Resource
    Integrability of Chern–Simons–Higgs and Abelian Higgs vortex equations in a background metric (1991)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 32 (1991), S. 753-761 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The equations for Chern–Simons–Higgs and Abelian Higgs vortices are reformulated in a certain form of background metric. Painlevé analysis is applied to determine integrability of the equations, and explicit solutions for cylindrically symmetric Chern–Simons–Higgs vortices are found for a specific choice of the metric.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529367
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  • 3
    Electronic Resource
    Electronic Resource
    Electroabsorption measurements and built-in potentials in amorphous silicon–germanium solar cells (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1924-1926 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report electromodulated reflectance spectra in n-i-p solar cells with hydrogenated amorphous silicon–germanium alloy absorber layers. At lower photon energies the spectra are determined by bulk electroabsorption, and exhibit peaks near the optical gap of the absorber layers. Voltage scaling of the electroabsorption spectra indicate a built-in potential of Vbi=1.17 V in cells with absorber layer band gaps of 1.50 eV; in conjunction with earlier work, this value argues against a systematic decline in Vbi with an absorber layer band gap. At higher photon energies the spectra are due to direct electroreflectance; the voltage scaling was consistent with model predictions for the electric field at the interface of the p-type and absorber layers. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1356443
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  • 4
    Electronic Resource
    Electronic Resource
    Determining the locus for photocarrier recombination in dye-sensitized solar cells (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 685-687 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present intensity-modulated photocurrent and infrared transmittance measurements on dye-sensitized solar cells based on a mesoporous titania (TiO2) matrix immersed in an iodine-based electrolyte. Under short-circuit conditions, we show that an elementary analysis accurately relates the two measurements. Under open-circuit conditions, infrared transmittance, and photovoltage measurements yield information on the characteristic depth at which electrons recombine with ions (the "locus of recombination"). For one particular series of samples recombination occurred near the substrate supporting the titania film, as opposed to homogeneously throughout the film. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1436533
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  • 5
    Electronic Resource
    Electronic Resource
    Electron drift mobility measurements on annealed and light-soaked hydrogenated amorphous silicon (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2791-2793 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We measured the effects of light soaking on the electron drift mobility for three specimens of hydrogenated amorphous silicon (a-Si:H) from different laboratories. The temperature range 130–300 K was studied. The measurements in all cases reveal two temporal regimes: an early time regime associated with bandtail transport, and a later-time regime associated with deep trapping of the electrons. We found no evidence for effects of light soaking on the bandtail regime within a reproducibility error of 20%. Deep trapping was significantly affected by light soaking, in agreement with extensive prior measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106829
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  • 6
    Electronic Resource
    Electronic Resource
    Collisional effects in Q branch coherent anti-Stokes Raman spectra of N2 and O2 at high pressure and high temperature (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 6275-6289 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A temperature and pressure dependent study of coherent anti-Stokes Raman scattering (CARS) Q branch spectra of molecular nitrogen and oxygen has been conducted. Spectra at pressures up to 250 MPa and in the temperature range 298 K〈T〈850 K have been obtained using a scanning CARS apparatus. The full-width at half-maximum (FWHM) as well as peak position of collapsed Q branch profiles were measured. Measurements also have been made in synthetic air and in mixtures with argon. A detailed comparison of Q branch CARS band shapes with theoretical models of quantum mechanical and quasiclassical origin has been performed. On the one hand existing scaling laws like the modified energy gap (MEG), energy corrected sudden (exponential) polynomial energy gap [ECS-(E)P], polynomial energy gap (PEG), and statistical polynomial energy gap (SPEG) laws that give analytical expressions for rotational relaxation rates are used in a CARS code to calculate half-widths of the collapsed Q branch of nitrogen and oxygen. Many of these models show significant deviations from experimental results in the high pressure regime investigated here. For nitrogen the PEG-law, although not very suitable at lower densities, at room temperature reasonably reproduces the half-widths in the high pressure regime. The same is true for the ECS-EP law at low and high temperatures, whereas the SPEG-law only gives reasonable results at high temperature. For oxygen only the MEG and ECS-EP laws (at room temperature) give half-widths that are within the error limits of the measurement. On the other hand, within experimental error frequency shifts and half-widths of N2 and O2 CARS-spectra are well described by the classical approach throughout the density range. It is found that dephasing contributions to the density induced spectral shift cannot be neglected at room temperature but are less important at higher temperatures. In comparison to experimental data the quasiclassical model provides physical interpretation of temperature dependent cross sections for rotational energy relaxation processes in nitrogen and oxygen at high densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467090
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  • 7
    Electronic Resource
    Electronic Resource
    Polygenic powdery mildew disease resistance in Arabidopsis thaliana: quantitative trait analysis of the accession Warschau-1 (2001)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 50 (2001), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: To further the understanding of the natural genetic diversity for disease resistance to powdery mildew (Erysiphe cichoracearum) in Arabidopsis thaliana, quantitative trait loci analysis was undertaken on recombinant inbred lines derived from a cross between the resistant accession Warschau-1 and the susceptible Columbia-0. Powdery mildew grew less well on Warschau-1, but the resistance was not associated with a specific block in the infection sequence. Two potential powdery mildew disease-resistance loci were identified and mapped, one with a major effect and one with a minor effect on disease resistance. The two loci acted in an additive manner to confer resistance, and together they explained 65% of the variation in resistance. In addition, the major powdery mildew disease-resistance locus was genetically mapped to the bottom of chromosome III, a region containing the powdery mildew resistance loci RPW7, RPW8 and RPW10. Unlike resistance mediated by the RPW8 locus in the accession Moscow-1, resistance in Warschau-1 was not correlated with the hypersensitive response, highlighting the influence of genetic background or environmental factors on the expression of disease resistance. Together with the powdery mildew resistance loci described in other studies, these results suggest that A. thaliana is a useful source of natural powdery mildew disease resistance, which potentially can be utilized in fundamental studies and as a tool for applied studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2001.00611.x
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  • 8
    Electronic Resource
    Electronic Resource
    PHOTOGRAPHY WITHOUT FILM: LOW-COST DIGITAL CAMERAS COME OF AGE IN DERMATOLOGY (1994)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of dermatology 33 (1994), S. 0 
    Details
    ISSN: 1365-4632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background. Photography is integral to the practice of dermatology. Digital imaging techniques have only recently been used to assess cutaneous disorders. Previously reported imaging systems have been both expensive and cumbersome. Consequently, they have failed to gain widespread acceptance. Methods. We describe our experience using an inexpensive digital camera. Photographs taken with this portable digital camera (FotoMan) compare favorably to those obtained with conventional 35 mm cameras. Results. This inexpensive digital camera provides photographs of acceptable quality for a variety of dermatologic applications. Images created with this system are available within minutes and are less expensive than traditional photographs. Conclusions. Digital imaging is a new and exciting development. The digital camera described is simple to operate and provides a useful alternative or adjunct to conventional photography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-4362.1994.tb01538.x
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  • 9
    Electronic Resource
    Electronic Resource
    FOSCARNET-INDUCED PENILE ULCERATION (1993)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of dermatology 32 (1993), S. 0 
    Details
    ISSN: 1365-4632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-4362.1993.tb02842.x
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  • 10
    Electronic Resource
    Electronic Resource
    Vasomotor Flushes (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 592 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb30345.x
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