Rolland Gagnon

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The Wiedemann-Franz (WF) ratio compares the thermal and electrical conductivities in a metal. We describe a new way to determine its value, based on the thermal Hall conductivity. The technique is applied to copper and to untwinned YBaCuO. In the latter, we uncover a T-linear dependence and suppression of the Hall-channel WF ratio. We discuss the(More)
In a three-phase transformer, the load losses are generally similar between phases, with some small variations due to the proximity of the tank on lateral phases. However, when a three-phase test configuration is used, the measured active losses in each phase are significantly unbalanced and do not reflect the actual losses in each phase. To provide a(More)
The protection of coldwater refugia within aquatic systems requires the identification of thermal habitats in rivers. These refugia provide critical thermal habitats for brook trout (Salvelinus fontinalis) and Atlantic salmon (Salmo salar) during periods of thermal stress, for example during summer high temperature events. This study aims to model these(More)
Lactobacillus rhamnosus R0011 was inoculated in an apple-pear-raspberry juice blend at 4.5 x 10(9) CFU/250 mL portion, and viability was followed during storage in conditions simulating consumer use. Study parameters were age of the juice (2 or 4 wk), sampling size (one to three 250-mL portions), incubation temperature (between 2 and 7 degrees C), and(More)
Using a sensitive torque magnetometer we have studied magnetization curves for untwinned overdoped YBa2Cu3O7 single crystals in fields of up to 28 T. We demonstrate the existence of history effects below the lower critical point and provide a full demarcation of the Bragg-glass phase. A pronounced symmetry is observed in the behavior of the phase lines,(More)
In the mixed state of type II superconductors, vortices penetrate the sample and form a correlated system due to the screening of supercurrents around them. Interestingly, we can study this correlated system as a function of density and driving force. The density, for instance, is controlled by the magnetic field B, whereas a current density j acts as a(More)
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