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Sökning: WFRF:(Laury John) > (2015)

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1.
  • Cuddihy, Laury, et al. (författare)
  • Vertebral Body Stapling versus Bracing for Patients with High-Risk Moderate Idiopathic Scoliosis.
  • 2015
  • Ingår i: BioMed research international. - : Hindawi Limited. - 2314-6141 .- 2314-6133. ; 2015
  • Tidskriftsartikel (refereegranskat)abstract
    • We report a comparison study of vertebral body stapling (VBS) versus a matched bracing cohort for immature patients with moderate (25 to 44°) idiopathic scoliosis (IS).42 of 49 consecutive patients (86%) with IS were treated with VBS and followed for a minimum of 2 years. They were compared to 121 braced patients meeting identical inclusion criteria. 52 patients (66 curves) were matched according to age at start of treatment (10.6 years versus 11.1 years, resp. [P = 0.07]) and gender.For thoracic curves 25-34°, VBS had a success rate (defined as curve progression <10°) of 81% versus 61% for bracing (P = 0.16). In thoracic curves 35-44°, VBS and bracing both had a poor success rate. For lumbar curves, success rates were similar in both groups for curves measuring 25-34°.In this comparison of two cohorts of patients with high-risk (Risser 0-1) moderate IS (25-44°), in smaller thoracic curves (25-34°) VBS provided better results as a clinical trend as compared to bracing. VBS was found not to be effective for thoracic curves ≥35°. For lumbar curves measuring 25-34°, results appear to be similar for both VBS and bracing, at 80% success.
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2.
  • Laury, John, et al. (författare)
  • Multi-machine transient stability for railways
  • 2015
  • Ingår i: Computers in Railways XIV Special Contributions. - Southampton : WIT Press. - 9781784660253 - 9781784660260
  • Konferensbidrag (refereegranskat)abstract
    • This papers concern the replacement of Static Frequency Converters (SFC) by Rotary Frequency Converters (RFC) in Railway Power Supply Systems (RPSS) operating at 16⅔ Hz. There is a need to investigate how such a system behaves with only one or with a small number of RFCs. This is of great importance as SFCs do not contribute to the inertia of the RPSS. Thus, the remaining RFCs have to keep the stability during a large disturbance.Few studies investigate the stability of a RPSS and most of them study only the behaviour of a RFC in a converter station against an infinite bus. However, there are very few studies investigating a system with several RFCs in converter stations. Against this background, the aim of this paper is to present the results of a multi-machine transient stability study with several RFCs. Different cases have been investigated: regenerative braking of a train; a fault in the overhead contact line and a fault in the parallel 132 kV line.For the investigated cases the system with RFCs is stable but oscillations in the rotor angle swing occur due to no damping being modelled in the system.
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