Electromechanical coupling is ubiquitous in biological systems, with examples ranging from simple piezoelectricity in calcified and connective tissues to voltage-gated ion channels, energy storage in mitochondria, and electromechanical activity in cardiac myocytes and outer hair cell stereocilia. Piezoresponse force microscopy (PFM) originally emerged as a technique to study electromechanical p...

PURPOSE In this study we aimed to investigate myocardial function and atrial electromechanical properties by conventional and tissue doppler echocardiography in patients with primary Sjögren syndrome. METHODS Forty patients with Sjögren syndrome (SS) and 25 age- and sex-matched healthy volunteers were enrolled in the study. Using transthoracic echocardiography, myocardial performance index an...

In the field of mechanics, it is a long standing goal to measure quantum behavior in ever larger and more massive objects. It may seem like an obvious conclusion now, but up until recently it was not clear whether a macroscopic mechanical resonator – built up from nearly 10 atoms – could be fully described as an ideal quantum harmonic oscillator. With recent advances in the fields of optoand el...

This paper presents a two-degree-of-freedom analytical model for the electromechanical response of double ended tuning fork (DETF) force sensors. The model describes the mechanical interaction between the tines and allows investigation of the effect of a number of asymmetries, in tine stiffness, mass, electromechanical parameters and load sharing between the tines. These asymmetries are introdu...

in this paper deflection and free vibration of sandwich panel is studied. the core of sandwich panels is made of hexagonal honeycomb and faces are made of two different materials of carbon fiber reinforced plastic and k-aryl/epoxy covering. the governing equations are deduced from the first order sheer deformation theory (fsdt) and they are solved using generalized differential quadrature metho...

In this study, we report a fully described modeling and simulation of a piezoelectric layered structure for surface acoustic wave (SAW) applications. SAW propagation characteristics were numerically investigated in ZnO/IDT/128° YX LiNbO3. The numerical analysis was conducted using Finite Element Method (FEM) in COMSOL Multiphysics 4.3b platform. The numerical results show that the electromechan...

Abstract In this paper, an analytical model of a micro-electromechanical (MEM) resonator used as 4-bit digital-to-analog converter (DAC) is presented. First, we derive the dynamic equation DAC device, and nonlinear governing solved by Galerkin method combined with shooting technique to simulate static response, linear eigenvalue problem, forced vibration response device for various electrostati...

A previously proposed two-terminal carbon-nanotube-based device with closed-loop feedback is demonstrated through in situ scanning electron microscopy (SEM) experiments. The pull-in/pull-out tests were carried out using a multi-walled carbon nanotube (MWCNT) welded to a conductive probe attached to a nanomanipulator. The MWCNTs were cantilevered over a gold electrode and electrostatically actua...