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Träfflista för sökning "WFRF:(Newell M) srt2:(2000-2004)"

Sökning: WFRF:(Newell M) > (2000-2004)

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  • Vaivads, A., et al. (författare)
  • What high altitude observations tell us about the auroral acceleration : A cluster/DMSP conjunction
  • 2003
  • Ingår i: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 30:3
  • Tidskriftsartikel (refereegranskat)abstract
    • [1] Magnetic conjugate observations by Cluster and DMSP F14 satellites are used to study the field lines of auroral arc. Cluster is well above the acceleration region and observes upward keV ion beams and bipolar electric structures. The integrated potential at Cluster altitudes shows a dip that is consistent with the keV electron acceleration energy at low altitude. The earthward Poynting flux at Cluster altitudes is comparable to the electron energy flux at low altitudes. Thus, for this event the auroral acceleration can be described as a quasi-stationary potential structure with equipotential lines reaching the Cluster altitudes. The arc forms at the outer edge of the plasma sheet at a density gradient. Multiple Cluster satellite measurements allow us to study the density increase associated with the development of the arc, and to estimate the velocity of the structure. The quasi-potential structure itself may be part of an Alfven wave.
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  • Newell, Theresa M., et al. (författare)
  • Prevalence of musculoskeletal disorders among orthodontists in Alberta
  • 2004
  • Ingår i: International Journal of Industrial Ergonomics. - : Elsevier BV. - 0169-8141 .- 1872-8219. ; 33:2, s. 99-107
  • Tidskriftsartikel (refereegranskat)abstract
    • Ergonomic problems have been noted among the hazards in the dental workplace. Many surveys have suggested that dental professionals may suffer from musculoskeletal disorders (MSDs) of the low back and neck as well as other MSDs. This survey aimed to look deeper into MSDs among orthodontists and provide a starting point to direct ergonomic intervention. The standardized Nordic questionnaire was mailed out to all registered orthodontists in Alberta, Canada. There was a 52.4% response rate from a sample of 61. Seventy-two percent of the respondents were male and 28% were female. The results showed low back trouble to be the most prevalent MSD (59%), followed by neck (56%), and shoulder trouble (47%). There was no significant differences in MSD prevalence between gender (p > 0.4), and no correlations existed between age, years of work, and number of hours of practice per week (p > 0.3). These results were consistent with other studies surveyed on dental professionals for the number and type of MSDs present. Further attention should be directed towards risk factors and ergonomic intervention.
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