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  • Author: A. Szekeres x
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Plane Waves in Thermo-Viscoelastic Material with Voids Under Different Theories of Thermoelasticity

Abstract

Propagation of time harmonic plane waves in an infinite thermo-viscoelastic material with voids has been investigated within the context of different theories of thermoelasticity. The equations of motion developed by Iesan [1] have been extended to incorporate the Lord-Shulman theory (LST) and Green-Lindsay theory (GLT) of thermoelasticity. It has been shown that there exist three coupled dilatational waves and an uncoupled shear wave propagating with distinct speeds. The presence of thermal, viscosity and voids parameters is responsible for the coupling among dilatational waves. All the existing waves are found to be dispersive and attenuated in nature. The phase speeds and attenuation coefficients of propagating waves are computed numerically for a copper material and compared under different theories of thermo-elasticity. The expressions of energies carried along each wave have also been derived. All the computed numerical results have been depicted through graphs. It is found that the influence of CT and GLT is almost same on wave propagation, while LST influences the wave propagation differently.

Open access
Can Erectile Dysfunction Predict Major Cardiovascular Events?

Abstract

It is estimated that erectile dysfunction (ED) affects more than 150 million people worldwide and this number is expected to double by the year 2025. Vascular component represents the most important etiological cause of erectile dysfunction. ED shares almost all risk factors, such as hypertension, diabetes mellitus, hyperlipidaemia and smoking, with arteriosclerosis. Moderate to severe ED is associated with a considerably increased risk for coronary heart disease (CHD). This review was conducted in May 2016, when the PubMed database was searched using the combination of the terms “erectile dysfunction” and “cardiovascular diseases”, “coronary artery diseases” and “risk factors”. In this review, we analyzed the published literature, regarding the predictive role of ED in CVD and the association of ED risk factors with CVD risk factors, aiming to draw particular attention on the role of sexual inquiry of all men to prevent or decrease major cardiovascular events. In conclusion, the early detection of ED can prevent major cardiovascular events with early management of cardiovascular risk and permits to include patients in a risk stratification group. Erectile function should be evaluated using questionnaires in all male patients to prevent and decrease the rates of major cardiovascular events.

Open access