First-order transition in the ginzburg-landau model

The d-dimensional complex Ginzburg-Landau (GL) model is solved according to a variational method by separating phase and amplitude. The GL transition becomes first order for high superfluid density because of phase fluctuations. We discuss its origin with various arguments showing that, in particular for d = 3, the validity of our approach lies precisely in the first-order domain.

[Hemorheologic effects following ergometric-controlled physical exercise]. / Effects hémorhéologiques consécutifs a des exercices physiques controlés sur ergocyle.

In collaboration with the Laboratory of Physiology, the Unity of Biorheology realized hemorheological studies on healthy volunteers who performed four kinds of well-controlled exercises on a cycle ergometer. Blood was always collected just before exercise and just after exercise. Rheological measurements were performed (blood and plasma viscosities, blood thixotropy and blood viscoelasticity) as well as biological (plasma proteins) and biophysical (osmolarity, pH) measurements. In all the cases, results show the importance of a hemoconcentration and its hemorheology consequences.