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Träfflista för sökning "WFRF:(Lundell M) ;srt2:(2005-2009)"

Sökning: WFRF:(Lundell M) > (2005-2009)

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  • Lundell, M, et al. (författare)
  • Low incidence of brain death and organ donation in Sweden. Analyses of a six-year prospective registration of all deceased patients in intensive units in Southern Sweden
  • 2006
  • Ingår i: Organs, Tissues and Cells. - 1828-0595. ; 9:1, s. 23-27
  • Tidskriftsartikel (refereegranskat)abstract
    • Sweden is among those countries in Europe that have the lowest number of organ donors per million population (PMP). Because of the low numbers of actual donors, it is important to identify the total number of potential donors. Thus, a prospective registration of all deceased patients at all intensive care units was introduced in the Southern Healthcare Region of Sweden, which has a population of 1.6 million. During the six years from 1999 to 2004, 3,760 deaths were recorded. Only 251 patients (7%) of all ages were diagnosed with brain death, corresponding to 26 patients PMP and year. Of these, 194 cases (20 PMP) were classified as potential organ donors, defined as brain death without medical contraindications against organ donation. Consent for organ donation was given in slightly more than half of these cases (54%) thus, there were only around 11 organ donors PMP and year. The continuous registration in Southern Sweden has been a very important tool for evaluation of what forms of action should be taken to promote organ donation. As part of a computerised system for quality assurance in intensive care now being introduced in many parts of Sweden, registration may become an instrument of quality assurance for organ donation nationwide.
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  • Oseen-Senda, K. M., et al. (författare)
  • The cooling of PEFC with pentane boiling in minichannels : A study of flow instabilities using neutron radiography visualization
  • 2007
  • Ingår i: Heat Transfer Engineering. - : Informa UK Limited. - 0145-7632 .- 1521-0537. ; 28:1, s. 49-57
  • Tidskriftsartikel (refereegranskat)abstract
    • Polymer electrolyte fuel cells (PEFC) operate best at a steady temperature of about 80 degrees C and have a very low heat flux compared to other heat transfer applications. Two-phase pentane cooling of bipolar plates is studied in order to optimize fuel cell cooling in transport applications. High-speed visualizations of boiling pentane in a circular steel tube (D-i = 1.1 mm, D-o = 2 mm) have been performed in a Neutrograph instrument at the Institut Laue-Langevin in Grenoble, France. The heat and mass flux were both very low and appropriate for cooling of PEFC. The spatial resolution of the images is approximately 0.15 mm and the maximum frequency is 154 Hz. In the images, the liquid-vapor differentiation is clearly visible. Time resolved measurements of the outer pipe wall temperature, synchronized with the images, show that at low mass flow rates, the pipe wall is high above the saturation temperature and the pipe filled with vapor and liquid slugs. At higher flow rates, the wall is superheated when filled with liquid, and at saturation temperature during boiling when exposed to a liquid-vapor mixture. An irregular switch between these two states was observed. The superheated wall is shown to be consistent with the superheated liquid in the pipe in both stable and time-dependent states. Unfortunately, the strong gamma-radiation produced by the neutrons has a substantial effect on the onset of boiling, which is why comparisons with non-irradiated systems might be difficult. Simplified steady and time-dependent models are proposed to explain the measured wall temperature instabilities and superheat.
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