Browsing by Author "Mignot, Emmanuel"

Now showing 1 - 7 of 7
  • Thumbnail Image
    Item
    Cataplexy features in childhood narcolepsy
    (WILEY-LISS, 2008) Serra, Leonardo; Montagna, Pasquale; Mignot, Emmanuel; Lugaresi, Elio; Plazzi, Giuseppe
    Cataplexy, the hallmark of narcolepsy, has been well characterized in adults but not in children. This study systematically used structured clinical assessments and video-recordings (49 episodes in eight cases) to evaluate cataplexy in 23 patients diagnosed before the age of 18 years. Forty-three percent of patients had falls as part of their attacks. During cataplexy knees, head, and jaw were the most frequently compromised body segments; eyelids, arms, and trunk being less commonly involved. More rarely, blurred vision, slurred speech, irregular breathing, or a sudden loss of smiling mimics were reported. One-third of the sample presented with a previously unrecognized description of cataplexy that we coined "cataplectic facies," consisting of a state of semipermanent eyelid and jaw weakness, on which partial or complete cataplectic attacks were superimposed. The usual triggering emotions, such as laughter, joking, or anger, were not always present, especially when close to an abrupt onset, hampering diagnosis. Video-recordings of cataplectic attacks may be useful to document the attack, allowing a comparison with archived presentations. (c) 2008 Movement Disorder Society.
  • No Thumbnail Available
    Item
    Closure to "Energy Dissipation and Turbulent Production in Weak Hydraulic Jumps" by E. Mignot and R. Cienfuegos
    (2011) Mignot, Emmanuel; Peltier, Yann; Cienfuegos Carrasco, Rodrigo Alberto
  • Thumbnail Image
    Item
    Field and Numerical Investigation of Transport Mechanisms in a Surface Storage Zone
    (2019) Sandoval Ulloa, Jorge Cristóbal; Mignot, Emmanuel; Mao, Luca; Pastén González, Pablo Arturo; Bolster, Dioogo; Escauriaza Mesa, Cristián Rodrigo; CEDEUS (Chile)
  • Thumbnail Image
    Item
    On the application of a Boussinesq model to river flows including shocks
    (ELSEVIER SCIENCE BV, 2009) Mignot, Emmanuel; Cienfuegos, Rodrigo
    SERR-1D is a 4th-order finite volume 1D Boussinesq model including wave breaking energy dissipation through extra diffusive-like terms. This model has been primarily conceived to compute wave propagation in coastal areas and has been validated for breaking and non-breaking waves propagating over uneven bathymetries (Cienfuegos et al., 2005, 2006a, b, 2007). The present paper aims at investigating the ability of SERR-1D to simulate challenging fluvial hydraulic applications such as sudden gate operation in open channels generating short waves, dam-break flows and a steady hydraulic jump over a bump. The performance of the absorbing-generating boundary condition implemented in SERR-1D is first analysed in the context of fluvial applications where relatively short waves must be evacuated from the computational domain without producing spurious reflection. Next, by comparing numerical results to analytical and experimental dam-break test cases we show that the model is able to reproduce the overall features of these flows, but that additional care should be paid to the representation of energy dissipation and front speed in order to accurately represent bore dynamics. (C) 2008 Elsevier B.V. All rights reserved.
  • Thumbnail Image
    Item
    Scour at Bridge Foundations in Supercritical Flows: An Analysis of Knowledge Gaps
    (2019) Link, Oscar; Mignot, Emmanuel; Roux, Sebastien; Camenen, Benoit; Escauriaza Mesa, Cristian Rodrigo; Chauchat, Julien; Brevis, Wernher; Manfreda, Salvatore
  • Thumbnail Image
    Item
    Spatial evolution of turbulence characteristics in weak hydraulic jumps
    (TAYLOR & FRANCIS LTD, 2011) Mignot, Emmanuel; Cienfuegos, Rodrigo
    This experimental investigation focuses on the turbulence features of weak hydraulic jumps in rectangular channels for two different approach flow lengths. The turbulent kinetic energy equation includes the turbulence production and dissipation terms, two advection and two turbulent transport terms and the pressure transport term, which could not be measured, however. For jumps with a limited approach flow length, the turbulence production is mostly confined to the shear layer, while for jumps with a longer approach flow length, an additional peak turbulence production region is observed at the near-wall region due to boundary layer separation. The turbulent energy is then transported by the mean flow both towards the free surface and into the downstream direction and is diffused by turbulent processes away from the energetic shear layer towards less energetic regions. Dissipation occurs mostly in the shear layer along the upstream portion of the jump and over most of the flow depth further downstream.
  • Thumbnail Image
    Item
    Turbulent flow dynamics and mass transport processes in a natural surface storage zone using field data and numerical simulations
    (2018) Sandoval, Jorge; Escauriaza Mesa, Cristian Rodrigo; Mignot, Emmanuel; Mao, Luca