Plane time-harmonic waves with assigned wavelength are supposed to propagate in an infinite linear thermoelastic space: The thermodynamic response is framed into the time differential dual-phase-lag model, while Cowin–Nunziato theory used depict effect of porosity for elastic part. We able show that it possible identify two shear waves, undamped and not affected by and/or temperature, as well f...

We analyze an extension of the dual-phase lag model thermal diffusion theory to accurately predict contribution thermoelastic bending (TE) Photoacoustic (PA) signal in a transmission configuration. To achieve this, we adopt particular case Jeffrey’s equation, Generalized Cattaneo Equations (GCEs). Obtaining temperature distribution by incorporating effects fractional differential operators enab...

In this paper, the interaction between holes and electrons in semiconductor media is analyzed based on existing mathematical–physical model. The elasto-thermodiffusion (ETD) theory, according to photothermal (PT) transport processes, has been used study model under impact of non-Gaussian laser pulse. A one-dimensional (1D) electronic/thermoelastic deformation described, detail, by governing fie...

polyvinylidene fluoride/polyvinylpyrrolidone (pvdf/pvp) hollow fiber membranes were fabricated by dry-jet wet-spinning process. the correlated effects of the air gap length and pvp concentration ((1) the air gap length effect at the low and high pvp concentration in the dope solutions, as well as (2) the effect of the pvp concentration at the same air gap length) on the cross-section structure ...

Influence of the frequently used carbon sources in nitrate removal processes were evaluated in a lab-scale biofilm reactor. The NO3-N removal efficiency was in the order acetate>glucose>methanol>ethanol. Acetate-fed biofilm reduced nearly 100% NO3-N with negligible amount of NO2-N accumulation. Although 99% NO3-N was reduced in the glucose-fed biofilm, substantial NH3-N and NO2-N accumulated. M...

Finding the thermoelastic damping in a vibrating body, for the most general case, involves the simultaneous solving of the three equations for displacements and one equation for temperature (called the heat equation). Since these are a set of coupled nonlinear partial differential equations there is considerable difficulty in solving them, especially for finite geometries. This paper presents a...

In the design of high Quality factor (Q) micro or nano beam resonators, different dissipation mechanisms may have damaging effects on the quality factor. One of the major dissipation mechanisms is the thermoelastic damping (TED) that needs an accurate consideration for prediction. In this paper, thermoelastic damping of the longitudinal vibration of a homogeneous micro beam with both ends clamp...

Analysis for the generalized thermoelastic Lamb waves, which propagates in anisotropic thin plates in generalized thermoelasticity, is presented employing normal mode expansion method. The displacement and temperature fields are expressed by a summation of the symmetric and antisymmetric thermoelastic modes in the surface thermal stresses and thermal gradient free orthotropic plate, therefore t...