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Sökning: WFRF:(Broman Lars)

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  • Broman, Arne, et al. (författare)
  • Museum exhibits for the conics
  • 1994
  • Ingår i: Mathematics Magazine. - Washington, DC, USA : Mathematical Association of America. - 0025-570X .- 1930-0980. ; 67:3, s. 206-209
  • Tidskriftsartikel (refereegranskat)abstract
    • It is rather common nowadays that museums, especially those of the "science center" type, have showcases where visitors can perform experiments. In the Futures' Museum in Borlänge we have made an exhibit where interested persons can construct parabolas. In this note we describe this showcase. Analogous exhibits can be made for constructing ellipses and hyperbolas.
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  • Broman, Lars, et al. (författare)
  • Astronomical interactive exhibits
  • 2002
  • Ingår i: 16th International Planetarium Society Conference. - Wichita, KA, USA.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • It has been shown (Franck Pettersen, Master thesis 1995) that a planetarium show has a much larger educational impact if it is accompanied by hands-on experimenting. In the present paper, a number of interactive exhibits that we have used together with Stella Nova Planetarium at Falun Science Center and at Teknoland are presented.
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  • Broman, Lars, et al. (författare)
  • Parabolic dish concentrators approximated by simple surfaces
  • 1996
  • Ingår i: Solar Energy. - 0038-092X .- 1471-1257. ; 57:4, s. 317-321
  • Tidskriftsartikel (refereegranskat)abstract
    • Two different concentrating mirrors have been constructed that resemble parabolic dish reflectors. Both mirrors are made of slightly curved strips of flat, bendable material. The strips of the most simplified mirror have only large-radius circles and straight lines as boundaries. The necessary equations for making the mirrors are given. Also a simple way to make a stiff, lightweight frame and support for the mirror strips has been developed. Models of the mirrors have been built and successfully used for cooking and baking.
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  • Broman, Lars, et al. (författare)
  • Parabolic dish reflectors for solar applications approximated by simple surfaces
  • 1996
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • Two different concentrating mirrors have been constructed that resemble parabolic dish reflectors. Both mirrors are made of slightly curved strips of flat, bendable material. The strips of the most simplified mirror have only large-radius circles and straight lines as boundaries. The necessary equations for making the mirrors have been derived. Also a simple way to make a stiff, lightweight frame and support for the mirror strips has been developed. Models of the mirrors have been built and successfully used for cooking and baking. This report is an extended version of a paper to be published in Solar Energy that contains complete derivations of all mirror design equations.
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  • Falk, Lars, et al. (författare)
  • Severe Lung Dysfunction and Pulmonary Blood Flow during Extracorporeal Membrane Oxygenation
  • 2024
  • Ingår i: Journal of Clinical Medicine. - 2077-0383. ; 13:4
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Extracorporeal membrane oxygenation (ECMO) is indicated for patients with severe respiratory and/or circulatory failure. The standard technique to visualize the extent of pulmonary damage during ECMO is computed tomography (CT). Purpose: This single-center, retrospective study investigated whether pulmonary blood flow (PBF) measured with echocardiography can assist in assessing the extent of pulmonary damage and whether echocardiography and CT findings are associated with patient outcomes. Methods: All patients (>15 years) commenced on ECMO between 2011 and 2017 with septic shock of pulmonary origin and a treatment time >28 days were screened. Of 277 eligible patients, 9 were identified where both CT and echocardiography had been consecutively performed. Results: CT failed to indicate any differences in viable lung parenchyma within or between survivors and non-survivors at any time during ECMO treatment. Upon initiation of ECMO, the survivors (n = 5) and non-survivors (n = 4) had similar PBF. During a full course of ECMO support, survivors showed no change in PBF (3.8 ± 2.1 at ECMO start vs. 7.9 ± 4.3 L/min, p = 0.12), whereas non-survivors significantly deteriorated in PBF from 3.5 ± 1.0 to 1.0 ± 1.1 L/min (p = 0.029). Tidal volumes were significantly lower over time among the non-survivors, p = 0.047. Conclusions: In prolonged ECMO for pulmonary septic shock, CT was not found to be effective for the evaluation of pulmonary viability or recovery. This hypothesis-generating investigation supports echocardiography as a tool to predict pulmonary recovery via the assessment of PBF at the early to later stages of ECMO support.
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