August 2014

Study of miscibility of liquid mixtures with a critical point: A new experiment for a physical chemistry course

This paper describes a new experiment for undergraduate students in physical chemistry. This experiment describes a separation process of liquid-liquid extraction using mixtures with a critical point of miscibility. In this experiment, students will learn how to measure solute concentration, and a new liquid-liquid extraction technique that we called Phase Transition Extraction (PTE). In this experiment, a liquid...

Author(s): Filomena Califano, Guram Nozadze, Alexander Ly van Manh and Ahmed Farhat

August 2014

Electrical properties and crystal structure of Y123, Y358 and Y257/Y211 composite bulk superconductors

The Y123, Y358 and Y257 bulk superconductors mixed with various ratio of non-superconducting Y211 (Y2BaCuO5) were synthesized by solid state reaction. The physical properties of pellets were investigated by d.c. four-probes measurement. The crystal structure was determined using powder X-ray diffraction and the characteristic peaks were determined using the Rietveld full-profile analysis method. Results showed that the...

Author(s): Kruaehong T.

August 2014

Effect of an axial magnetic field on the heat and mass transfer in rotating annulus

This study is interested in the effect of an axial magnetic field imposed on incompressible flow of electrically conductive fluid between two horizontal coaxial cylinders. The imposed magnetic field is assumed uniform and constant. The effect of heat generation due to viscous dissipation is also taken into account. The inner and outer cylinders are maintained at different uniform temperatures and concentrations. The...

Author(s): Sofiane ABERKANE, Malika IHDENE, Mourad MODERES and Abderahmane GHEZAL