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  • 1
    Electronic Resource
    Electronic Resource
    Interface traps in jet-vapor-deposited silicon nitride–silicon capacitors (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8507-8511 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The properties of interface traps in metal–silicon nitride (deposited by jet vapor deposition technique) –silicon (MNS) capacitors have been studied in some detail. In comparison with those in metal–oxide–Si capacitors, the interface traps in our MNS capacitors exhibit the following major differences: (i) ∼2 orders of magnitude higher time constants; (ii) no evidence of two distinguishable defects following irradiation as revealed by the ac conductance measurement; and (iii) absence of latent generation of interface traps following irradiation. On the other hand, the interface-trap transformation process following irradiation is qualitatively similar in silicon nitride and thermal oxide devices. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362529
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical modeling of the optical properties of hydrogenated amorphous-silicon-based p-i-n solar cells deposited on rough transparent conducting oxide substrates (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1074-1087 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrogenated amorphous-silicon (a-Si:H) -based solar cells consist of two electrodes and a p-i-n structure, deposited on glass substrates. Depositing the p-i-n layers and the back metallic electrode on an optically rough transparent conducting oxide (TCO) electrode enhances the absorption of the incident light in the active i layer: Light is scattered at the rough front interface and is partially trapped in the high refraction index layer, as in a waveguide. In addition TCO roughness increases the front transmission coefficient, increasing the amount of light in the active layer. TCO texture yields a relative increase of the conversion efficiency up to 30%. A semiempirical model of thin-film solar-cell optics is presented, taking into account the interface roughness by introducing experimentally derived scattering coefficients and treating the propagation of specular light in a rigorous way. Numerically simulated spectral response and total reflectance of standard solar cells deposited on different TCO textures are compared to experimental data. The results show a better fit to measured characteristics than simulations obtained by previous semiempirical modeling. Improvements mainly come from the light propagation calculation. According to the model, the number of passes incident light may make through the active i layer reaches six for the most efficient cell. As an example of the model's main application, the enhancement of the conversion efficiency that would be expected from an optimized TCO layer is calculated for each texture studied and for different back metallizations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356489
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluating Cellulose Acetylation Reactivity (1957)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 49 (1957), S. 763-767 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50568a044
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  • 4
    Electronic Resource
    Electronic Resource
    Catalysts for Acetylation of Cellulose (1961)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 53 (1961), S. 363-367 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50617a022
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  • 5
    Electronic Resource
    Electronic Resource
    Acousto-optic scanning and interfering photon density waves for precise localization of an absorbing (or fluorescent) body in a turbid medium (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 638-644 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In most optical methods proposed for imaging an absorbing object embedded in a turbid medium, data are collected using a single source and detector scanned mechanically across the surface of the medium. In our setup, we exploited destructive interference of diffusive photon density waves originating from two sources to localize an absorbing (or fluorescent) body in a scattering medium. A frequency-domain instrumentation is described that scans several laser-beam spots across the surface of a turbid medium using 1D (or 2D) acousto-optical deflectors. An additional acousto-optic deflector is used to establish arbitrary phase shifts for the interfering photon-density waves. A destructive interference pattern was created to laterally localize an absorbing (or fluorescent) body in the reflection and transmission modes. In some experiments the destructive interference pattern was altered by modulating the individual beam intensities to improve sensitivity and ameliorate surface texture problems. The experimental results were retrieved from a gated intensified CCD camera at 246 MHz modulation frequency. Results indicate that less than a 1 mm displacement of a small object embedded 10 mm in a medium with optical characteristics similar to bloodless skin tissue can be detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144190
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  • 6
    Electronic Resource
    Electronic Resource
    Sensitive detection of optical rotation in liquids by reflection polarimetry (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2801-2807 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a sensitive polarimeter for measuring optical rotation induced by chiral molecules in solution that operates in the reflectance mode. A polarized light beam is made to pass through a liquid sample two or more times before detection by reflecting the beam from the surface of the sample container. The optical activity of the sample is measured using a differential polarization detector. Our results show that, for certain initial polarization states and angular orientations of the beam with respect to the glass interfaces, high sensitivity to changes in the concentration of the sample can be achieved. Results of a theoretical analysis of the technique were confirmed by experiments in which optical rotation of glucose in water was measured using a simple apparatus that employs a light-emitting diode source. Glucose sensing in vivo and on-line monitoring of industrial processes using integrated optoelectronic sensors are discussed as potential applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144366
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Binary nucleation of ethanol and water (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 3693-3699 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The authors have used a fast expansion cloud chamber to measure binary homogeneous nucleation rates in several ethanol–water mixtures as a function of temperature, ethanol and water activities and nucleation rate. Data (ethanol and water activities) are presented for a range in nucleation rate from 103 to 105 drops/cm3 s from 263 to 293 K for mixtures having mole ratios (ethanol/water) of 10, 4, 0.1, 0.01, and 0.001. A comparison of the extensive data set to other data in the literature shows good agreement. We find current theory, as expected, is unable to accurately predict the data at low ethanol concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457827
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  • 8
    Electronic Resource
    Electronic Resource
    A tensile testing machine for stress oxidation kinetic studies in well-controlled conditions (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2666-2670 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe here a tensile testing machine suitable for severe conditions imposed by ultrahigh vacuum and for the different surface analysis techniques associated with it. The apparatus allows to apply a gradually tensile force to a sample ribbon heated to a high temperature by the Joule effect. It gives the experimenter the possibility to rotate the stressed specimen and to adjust its position in front of different requisite analyzers (Auger electron spectrometer, for instance). This tensile testing machine can be used for carrying out kinetic studies on the stress oxidation of metals and alloys at high temperatures in well-determined conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141857
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Studies in the Carbonate-Uranium System (1956)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 78 (1956), S. 5978-5983 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01604a004
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  • 10
    Electronic Resource
    Electronic Resource
    Studies in Enzyme Inhibition. I. Action of Some Simple Pterines on Xanthine Oxidase (1950)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 72 (1950), S. 2995-2998 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01163a054
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