Analytical and numerical simulations are carried out in order to identify physical parameters affecting acoustic and motion control by viscoelastic piezo-electric and material damping. Numerical simulations in terms of critical parameters, such as relaxation functions of the structure and piezo-electric devices, aerodynamic coefficients, Mach number, are carried out to evaluate their sensitivit...

This study presents a mathematical size-dependent model capable of investigating the dynamic behavior sandwich perforated nanobeam incorporating flexoelectricity effect. The nonlocal strain gradient elasticity theory is developed for both continuum mechanics and flexoelectricity. Closed forms equivalent geometrical variables are developed. Hamiltonian principle exploited to derive governing equ...

We develop a semiquantitative theory to describe the experimentally observed energy gain when two light beams intersect in hybrid organic-inorganic photorefractives. These systems consist of a nematic liquid-crystal (LC) layer placed between two photorefractive windows. A periodic space-charge field is induced by the interfering light beams in the photorefractive windows. The field penetrates i...

We present the derivation and code implementation of a first-principles methodology to calculate lattice-mediated contributions bulk flexoelectric tensor. The approach is based on our recent analytical long-wavelength extension density-functional perturbation theory [Royo Stengel, Phys. Rev. X 9, 021050 (2019)], avoids cumbersome numerical derivatives with respect wave vector that were adopted ...

In this paper, the governing equation of a piezoelectric semiconductor (PSC) is derived after consideration flexoelectricity and strain gradient effect. A one-dimensional first-order beam model obtained through integration across its section. Based on model, theoretical analysis carried out for cantilever PSC nanowire subjected to time-harmonic transverse shear force. The effects bending vibrat...

Introduction MicroChannel Fabrication Experimental Apparatus and Methodology Results and Discussion Summary and Conclusions CHAPTER 4 MICROPIV MEASUREMENT OF TURBULENT FLOW IN RECTANGULAR MICROCHANNELS WITH VARYING AS­ PECT RATIOS Abstract Introduction MicroChannel Fabrication Experimental Methodology Experimental Setup Measurement Error Results and Discussion Summary and Conclusions CHAPTER 5 ...

A new piezo-electric ozone monitor

Stepping Piezo Actuators (SPA) are long stroke linear piezoelectric actuators able to perform long stroke (typ. >10mm) with an important resolution (typ. <1nm). Use of famous Amplified Piezo Actuator APA gives the motor interesting characteristics, such as useful deformation mode and speed improvement, compared to standard inertial motors. The paper proposes experimental results obtained on var...