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  • Adiabatic transformation  (1)
  • Camera model  (1)
  • Cis-Parinaric acid = fluorescent probe for lipid peroxidation  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Lens effect on synthetic image generation based on light particle theory (1987)
    Springer
    The visual computer 3 (1987), S. 125-136 
    Details
    ISSN: 1432-2315
    Schlagwort(e): Computer graphics ; Synthetic image generation ; Lens effect ; Blurry image ; Light particle theory ; Camera model
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract The synthetic image generation with the lens effect consists of two consecutive processors: the hidden-surface processor, and the focus processor. The normal ray-tracing algorithms are used in the first processor. The second processor computes Lommel's function, which is an infinite series of Bessel functions. In order to avoid the complicated calculation and the huge memory consumption, an approximation method based on the light particle theory is developed. No noticeable differences can be detected between the results from the approximation method and those from the exact calculation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01962893
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A new method for quantum processes in fermionic heat baths (1987)
    Springer
    Journal of statistical physics 49 (1987), S. 811-826 
    Details
    ISSN: 1572-9613
    Schlagwort(e): Adiabatic transformation ; fermion bath ; Grassmann algebra ; influence functional ; path integral ; real-time density matrix
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The general path-integral formalism for real-time dynamics for a quantum system in a fermionic environment proposed previously is investigated by using a new method called local adiabatic transformation. This method is based on the observation that in the long-time limit (the time scale of the system is much larger than that of the environment, typically characterized by the inverse of the cutoff frequency of the environment), most degrees of freedom of the environment will follow the dynamics adiabatically. This feature is utilized by transforming the original problem of coordinate coupling into a problem of velocity coupling. This is achieved by making some simple unitary transformation on the fermion field (before path-integrating out of that field). By doing perturbations on the new problem, all the previous important results are recovered. Further-more, generalizations to more realistic situations [for example, a particle traveling over a large distance and coupled to a Fermi gas through the phase factor exp(ik·R) (the coupling may involve many channels of angular momentum)] are considered and significant results obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01009357
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Ethanol-Induced Cell Death by Lipid Peroxidation in PC12 Cells (1997)
    Springer
    Neurochemical research 22 (1997), S. 1187-1192 
    Details
    ISSN: 1573-6903
    Schlagwort(e): Lipid Peroxidation ; ethanol ; Cis-Parinaric acid = fluorescent probe for lipid peroxidation ; Resveratrol = antioxidant from grapes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Free radical generation is hypothesized to be the cause of alcohol-induced tissue injury. Using fluorescent cis-parinaric acid and TBARS, lipid peroxidation was shown to be increased in the presence of trace amounts of free ferrous ion in PC12 cells. This increase in lipid peroxidation was enhanced by ethanol in a dose dependent manner and also correlated with loss of cell viability, as measured by increased release of lactate dehydrogenase (LDH). Resveratrol, a potent antioxidant, had a protective effect against lipid peroxidation and cell death. These findings strongly suggest that ethanol-induced tissue injury and cell death is a free radical mediated process, and may be important in alcohol-related premature aging and other degenerative diseases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1021968526696
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