Experimental validation of ultrasonic guided modes in electrical cables by optical interferometry.

In this work, the dispersion curves of elastic waves propagating in electrical cables and in bare copper wires are obtained theoretically and validated experimentally. The theoretical model, based on Gazis equations formulated according to the global matrix methodology, is resolved numerically. Viscoelasticity and attenuation are modeled theoretically using the Kelvin-Voigt model.

Elastic guided wave propagation in electrical cables.

This article analyzes the propagation modes of ultrasound waves inside an electrical cable in order to assess its behavior as an acoustic transmission channel. A theoretical model for propagation of elastic waves in electric power cables is presented. The power cables are represented as viscoelastic-layered cylindrical structures with a copper core and a dielectric cover.

Audioverbal cognitive dysfunction in depression. Factors involved.

There is increasing evidence suggesting that depression is associated with a certain degree of cognitive dysfunction. However, there is still debate on whether this dysfunction is only substantially associated with the most severe forms of depression, on whether or not it decreases in parallel with clinical response, and on the role played in these changes by psychotropic medications. In order to clarify these questions, we analyzed the performance in several cognitive tasks that involved attention and working memory of 40 untreated subjects with a diagnosis of dysthymia or major depressive disorder without melancholia.