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  • Digitale Medien  (7)
  • 1995-1999  (5)
  • 1975-1979  (2)
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  • Digitale Medien  (7)
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  • 1
    Digitale Medien
    Digitale Medien
    Far-infrared pump-probe measurements of the intersubband lifetime in an AlGaAs/GaAs coupled-quantum well (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 3019-3021 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report pump-and-probe measurements of the electron intersubband lifetime (T1) in an AlGaAs/GaAs heterostructure using a picosecond pulsed far-infrared laser. The subband spacing (11 meV) is less than the optical-phonon energy. Time-resolved measurements yield intersubband lifetimes ranging from T1=1.1±0.2 ns to T1=0.4±0.1 ns depending on measurement conditions. Results are in agreement with previous lifetime measurements on the same sample using continuous excitation at intensities ≤1 W/cm2. The steady-state measurements yielded shorter lifetimes at high excitation intensities, possibly due to carrier heating leading to intersubband scattering by optical phonon emission. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.116683
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  • 2
    Digitale Medien
    Digitale Medien
    Infusion devices: most do not measure the volume infused (1998)
    Oxford : Blackwell Science Ltd
    Anaesthesia 53 (1998), S. 0 
    Details
    ISSN: 1365-2044
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2044.1998.0716g.x
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  • 3
    Digitale Medien
    Digitale Medien
    Evidence of Early Withdrawal in Time Deposit Portfolios (1999)
    Springer
    Journal of financial services research 15 (1999), S. 103-122 
    Details
    ISSN: 1573-0735
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Wirtschaftswissenschaften
    Notizen: Abstract The embedded options found in some securities are known to have significant impact on product pricing, secondary market valuation, and risk measurement and management. The option to withdraw commonly found in bank deposits is one of the least studied of these. We help to fill this gap by examining the level and interest rate sensitivity of early withdrawals of retail time deposits using panel data from the Thrift Financial Report. We find that longer-maturity time deposit portfolios commonly experience early withdrawals at economically significant levels. Further, we find that depositors respond positively, with increased levels of early withdrawal, to the reinvestment incentive they face when new deposit rates rise. These findings increase our understanding of consumer behavior with regard to financial products and have significant implications for the competitive pricing of deposit products and the management of bank interest rate risk.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008071719082
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  • 4
    Digitale Medien
    Digitale Medien
    The Fort Bragg managed care experiment: What do the results mean for publicly funded systems of care? (1996)
    Springer
    Journal of child and family studies 5 (1996), S. 191-195 
    Details
    ISSN: 1573-2843
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Psychologie , Sociologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02237942
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  • 5
    Digitale Medien
    Digitale Medien
    Self-observation in natural environments: Reactive effects of behavior desirability and goal-setting (1978)
    Springer
    Cognitive therapy and research 2 (1978), S. 39-56 
    Details
    ISSN: 1573-2819
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Psychologie
    Notizen: Abstract Behavioral effects of self-monitoring in the laboratory may not prove significant when individuals self-record for extended periods in their normal environments. A series of three experiments examined the extent to which a behavior's desirability or “valence” may cause it to change when self-monitored for several days in natural settings. Subjects' time awareness, the dependent variable, was measured before and after exposure to favorable, unfavorable, or neutral evaluations of time concern; half of the subjects were also told that a specific time-awareness level or goal (performance standard)was desirable. Results disclosed limitations of previous laboratory data. Valences determined only the initial direction and magnitude of behavior change; their effect after the first posttreatment day was not uniform. A valence alone maintained significant behavior change only if the change was in a direction supported by the subject's environment. A performance standard maintained change in the face of an unfavorable environment providing the subject found the standard credible. A watchbox device permitted surreptitious reliability checks: Self-monitoring proved slightly more reliable than previous research had indicated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01172511
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  • 6
    Digitale Medien
    Digitale Medien
    Raman shifts due to variations in backbone planarity in a group of polydiacetylenes (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 109-112 
    Details
    ISSN: 1022-1352
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Polydiacetylene xBCMU and 9PA crystals, solutions and solution-cast films vary in colour due to differences in backbone order and planarity. Associated with the colour changes are increases in the Raman frequencies of the triple and double backbone bond vibrational modes from those values found in the highly ordered single crystals. These increases are strongly correlated and the ratio of the change in the frequency of the triple bond mode to that of the double bond mode is found to be 1.6 (±0.1) over a wide variation in order. This ratio is compared with the values of 0.3 found under uniform strain and 1.1 predicted by a model of acetylenic to butatrienic delocalisation. The relationship between the Raman frequencies of the yellow solutions and melts and those of the crystal phases suggests that in the former the backbone has a continuous and smoothly curving ‘worm-like’ conformation. Models involving the break-up of the conjugated system by large-angle bond rotations appear to be incorrect for polydiacetylenes. These results have important consequences for theoretical models that predict the dependence of electron delocalisation on backbone order and planarity in polydiacetylenes.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Avian scale development. Absence of an “epidermal placode” in reticulate scale morphogenesisAided by Biology Department, University of South Carolina, Columbia, South Carolina. (1977)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 154 (1977), S. 83-93 
    Details
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: Timed-sequence studies have shown that reticulate scales on the ventral footpads of birds do not undergo “epidermal placode” formation during their morphogenesis, but arise as symmetrical evaluations similar to the scales of snakes and lizards. Unlike the scutellate scales on the dorsal surface of the foot, in which the formation of an “epidermal placode” and its subsequent morphogenesis result in distinct outer and inner epidermal surfaces, the reticulate scales elaborate only one type of epidermal surface.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jmor.1051540106
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