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  • 2000-2004  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 3872-3874 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The dielectric permittivity, tunability (Δε/ε), and loss tangent of Ba1−xSrxTiO3 (BST) films grown by pulsed-laser deposition are studied by near-field microwave microscopy. Based on theoretical simulations, a method is developed to measure the uniaxial dielectric anisotropy, ε⊥/ε(parallel), in BST films grown at different oxygen pressures. The measured ε⊥/ε(parallel) decreases with the film-growth oxygen pressure, consistent with the structural anisotropy. The films prepared at 50 mT, with ε⊥(approximate)ε(parallel), have the highest permittivity, tunability, and figure of merit. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3295-3297 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We use a near-field scanning microwave microscope to simultaneously image the dielectric constant, loss tangent, and topography in a PbTiO3 crystal. By this method, we study the effects of the local dielectric constant and loss tangent in the geometry of periodic domains on the measured resonant frequency, and quality factor. We also carry out theoretical calculations and the results agree well with the experimental data and reveal the anisotropic nature of the dielectric constant. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1573-1944
    Schlagwort(e): ethical cognition ; principled score ; intervention ; longitudinal ; cross-sectional
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Philosophie , Wirtschaftswissenschaften
    Notizen: Abstract In this study, we present evidence on the changes inethical cognition of business students over afour-year period. We use the Principled Score(P-score) of the Defining Issues Test to measure thischange. Specifically, we first compare the P-scores ofstudents at the entry to, halfway through, and shortlyafter graduation from a business school to analyze theeffect size of education on ethical cognition.Secondly, for a sample of students in an electivebusiness ethics course, we compare P-scores at thebeginning, and at the end of the semester to analyzethe effect size of specific intervention course onethical cognition. Prior studies in liberal arts fields have reportedhigh effect sizes from four-year college education onethical cognition, while a few studies have reportedonly moderate gains for business students. Consistentwith the liberal arts studies, our results indicatestatistically significant gains, and high effect sizesfor business students as well. Similarly, priorstudies have reported moderate gains in the P-scorefrom intervention courses in various fields. Ourresults indicate only low to moderate effect sizes forbusiness students. Importantly, while the gain waslow, and statistically insignificant for femalestudents, it was moderate, and highly significant formale students. Implications for education and researchare discussed.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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