The Eulerian mapping closure approach is developed for uncertainty propagation in computational uid mechanics. The approach is used to study the Probability Density Function (PDF) for the concentration of species advected by a random shear ow. An analytical argument shows that uctuation of the concentration eld at one point in space is non-Gaussian and exhibits stretched exponential form. An Eu...

By using a simple model of soliton±antisoliton pairs to simulate the quantum lattice ̄uctuations in one-dimensional conjugated polymers, the subgap optical absorption results from the transitions between the lowest unoccupied and the highest occupied levels off the conduction and valence bands, respectively, in the soliton±antisoliton excitations. There is no gap in the absorption induced by th...

Data produced by a reproducible source contains redundant information which allows seismic inversion to simultaneously determine the high-frequency uctuation in the P-wave velocity (or re ectivity) as well as the input energy source. The seismogram model is the plane-wave convolutional model derived from the constant density, variable sound velocity acoustic wave equation. The rst step is to an...

Growth dominance is a relatively new, simple, quantitative metric of within-stand individual tree growth patterns, and is defined as positive when larger trees in the stand display proportionally greater growth than smaller trees, and negative when smaller trees display proportionally greater growth than larger trees. We examined long-term silvicultural experiments in red pine (Pinus resinosa A...

Mechanisms for the deposition of heat in the lower coronal plasma are discussed, emphasizing recent attempts to reconcile the uid and kinetic perspectives. Structures at the MHD scales are believed to act as reservoirs for uctuation energy, which in turn drive a nonlinear cascade process. Kinetic processes act at smaller spatial scales and more rapid time scales. Cascade-driven processes are co...

Semiclassical Einstein-Langevin equations for arbitrary small metric perturbations conformally coupled to a massless quantum scalar eld in a spatially at cosmological background are derived. Use is made of the fact that for this problem the in-in or closed time path e ective action is simply related to the Feynman and Vernon in uence functional which describes the e ect of the \environment", th...

Dans un service de 36 lits de medicine in­fantile une periode de 18 mois, 33 enfants furent hospitalises pour une affection hematologique maligne: 21 cas de leucemie aigi.ie, 1 cas de leu­cemie myeloide chronique, 2 cas de lymphomes malins, 9 cas de Hodgkin aux differents stades evolutifs.  Aucune complication neurologique ne fut observe chez les malades attaints de Hodgkin. Ia moitie des enfa...

Syndrome de la queue de cheval. A propos de 4 cas.  Les auteurs rapportent quatre observations cliniques concernat des malades dont les pre­miers symptomes se manifesterent par des al­gies longitemps considerees comme "sciatique·s".  L' etude neurologique de ces cas demontrait qu'en realite "les algies sciatiques" n'etaient que des signes mono ou pluri-radiculaires en rapport avec un syndrome...