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  • 1990-1994
  • 1985-1989  (2)
  • 1989  (2)
Material
Years
  • 1990-1994
  • 1985-1989  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 20-28 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured N 1s near edge absorption spectra and the kinetic energy distribution of electrons emitted in the decay of N 1s core-to-bound-state excitations in condensed pyridine, pyrazine, and s-triazine. The electron emission spectra generated in the electronic decay of the core to bound state resonances lead to singly charged, participator-type molecular final states, equivalent to the final states populated in photoemission, as well as to double hole (Auger) spectator-type final states screened by the presence of a π spectator electron. The deexcitation spectra, therefore, give insight into charge–transfer and screening processes in the initial core-electron excited state, as well as in the final spectator double-hole states. One of the most prominent participator features observed in the spectra of pyridine, pyrazine, and s-triazine is due to the emission of the most strongly bound π electrons, reflecting the dynamic screening of the core hole in the aromatic azabenzene molecules. The spectator states, on the other hand, exhibit a much reduced screening energy shift compared to linear molecules due to the delocalized nature of the π spectator electron.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1238
    Keywords: Auto-PEEP ; COPD ; Pressure support ventilation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a case of hyperinflation induced isorythmic atrio-ventricular dissociation with circulatory failure in a patient with chronic obstructive pulmonary disease. The arrythmia was successfully treated by applying “pressure support ventilation” (PSV: 20 cmH2O) which, by decreasing the respiratory rate and increasing the expiratory time reduced the level of auto-PEEP. In order to explain this result the Authors recorded, in the same patient, the level of auto-PEEP and ΔFRC obtained with Intermittent Positive Pressure Ventilation (IPPV), Intermittent Mandatory Ventilation (IMV) and PSV at the same gas exchange values. PSV showed a dramatic reduction of both these parameters. (Auto-PEEP: IPPV 12 cmH2O, IMV 17 cmH2O, PSV 7 cmH2O).
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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