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1.
  • Norling, Rikke, et al. (författare)
  • Radiological imaging of the neck for initial decision-making in oral squamous cell carcinomas-A questionnaire survey in the Nordic countries
  • 2012
  • Ingår i: Acta Oncologica. - : Taylor & Francis. - 1651-226X .- 0284-186X. ; 51:3, s. 355-361
  • Tidskriftsartikel (refereegranskat)abstract
    • Background. Fast and accurate work-up is crucial to ensure the best possible treatment and prognosis for patients with head and neck cancer. The presence or absence of neck lymph node metastases is important for the prognosis and the choice of treatment. Clinical lymph node (N)-staging is done by palpation and diagnostic imaging of the neck. We investigated the current practice of the initial radiological work-up of patients with oral squamous cell carcinomas (OSCC) in the Nordic countries. Methods. A questionnaire regarding the availability and use of guidelines and imaging modalities for radiological N-staging in OSCC was distributed to 21 Head and Neck centres in Denmark (n = 4), Finland (n = 5), Iceland (n = 1), Norway (n = 4) and Sweden (n = 7). We also asked for a description of the radiological criteria for determining the lymph nodes as clinical positive (cN+) or negative (cN0). Results. All 21 Head and Neck centres responded to the questionnaire. Denmark and Finland have national guidelines, while Norway and Sweden have local or regional guidelines. Seventeen of the 19 centres with available guidelines recommended computed tomography (CT) of the cN0 neck. The waiting time may influence the imaging modalities used. Lymph node size was the most commonly used criteria for radiological cN+, but the cut-off measures vary from 0.8 to 2.0 cm. Conclusion. Overall, CT is the most commonly recommended and used imaging modality for OSCC. Despite availability of national guidelines the type and number of radiological examinations vary between centres within a country, but the implementation of a fast-track programme may facilitate fast access to imaging. The absence of uniform criteria for determining the lymph nodes of the neck as cN+ complicates the comparison of the accuracy of the imaging modalities. Well-defined radiological strategies and criteria are needed to optimise the radiological work-up in OSCC.
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2.
  • Nilsson, Karl, et al. (författare)
  • Airfoil data sensitivity analysis for actuator disc simulations used in wind turbine applications
  • 2014
  • Ingår i: Science of Making Torque from Wind. ; , s. 012135-, s. 012135-
  • Konferensbidrag (refereegranskat)abstract
    • To analyse the sensitivity of blade geometry and airfoil characteristics on the prediction of performance characteristics of wind farms, large-eddy simulations using an actuator disc (ACD) method are performed for three different blade/airfoil configurations. The aim of the study is to determine how the mean characteristics of wake flow, mean power production and thrust depend on the choice of airfoil data and blade geometry. In order to simulate realistic conditions, pre-generated turbulence and wind shear are imposed in the computational domain. Using three different turbulence intensities and varying the spacing between the turbines, the flow around 4-8 aligned turbines is simulated. The analysis is based on normalized mean streamwise velocity, turbulence intensity, relative mean power production and thrust. From the computations it can be concluded that the actual airfoil characteristics and blade geometry only are of importance at very low inflow turbulence. At realistic turbulence conditions for an atmospheric boundary layer the specific blade characteristics play an minor role on power performance and the resulting wake characteristics. The results therefore give a hint that the choice of airfoil data in ACD simulations is not crucial if the intention of the simulations is to compute mean wake characteristics using a turbulent inflow.
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3.
  • Nilsson, Karl, et al. (författare)
  • Large-eddy simulations of the Lillgrund wind farm
  • 2015
  • Ingår i: Wind Energy. - : John Wiley & Sons. - 1095-4244 .- 1099-1824. ; 18:3, s. 449-467
  • Tidskriftsartikel (refereegranskat)abstract
    • The power production of the Lillgrund wind farm is determined numerically using large-eddy simulations and compared with measurements. In order to simulate realistic atmospheric conditions, pre-generated turbulence and wind shear are imposed in the computational domain. The atmospheric conditions are determined from data extracted from a met mast, which was erected prior to the establishment of the farm. In order to allocate most of the computational power to the simulations of the wake flow, the turbines are modeled using an actuator disc method where the discs are imposed in the computational domain as body forces which for every time step are calculated from tabulated airfoil data. A study of the influence of imposed upstream ambient turbulence is performed and shows that higher levels of turbulence results in slightly increased total power production and that it is of great importance to include ambient turbulence in the simulations. By introducing ambient atmospheric turbulence, the simulations compare very well with measurements at the studied inflow angles. A final study aiming at increasing the farm production by curtailing the power output of the front row turbines and thus letting more kinetic energy pass downstream is performed. The results, however, show that manipulating only the front row turbines has no positive effect on the farm production, and therefore, more complex curtailment strategies are needed to be tested.
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4.
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5.
  • Stilhoff Sörensen, Jens, et al. (författare)
  • Trendig styrning med NPM skadar högskolan
  • 2016
  • Ingår i: Svenska Dagbladet. - : Svenska Dagbladet. - 1101-2412. ; , s. 6-6
  • Tidskriftsartikel (populärvet., debatt m.m.)
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6.
  • Sörensen, Jens, et al. (författare)
  • Akademisk Ofrihet
  • 2014
  • Ingår i: Uppsala Nya Tidning. - 1104-0173.
  • Tidskriftsartikel (populärvet., debatt m.m.)
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7.
  • Sörensen, Jens, et al. (författare)
  • Aningslöst om SLU-tvång
  • 2014
  • Ingår i: Uppsala Nya Tidning. - 1104-0173.
  • Tidskriftsartikel (populärvet., debatt m.m.)
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8.
  • Sörensen, Jens, et al. (författare)
  • Feltänkt om Akademisk Frihet
  • 2014
  • Ingår i: Uppsala Nya Tidning. - 1104-0173.
  • Tidskriftsartikel (populärvet., debatt m.m.)
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