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A Fully Coupled Model for Electromechanics of the Heart

by Henian Xia , Kwai Wong , Xiaopeng Zhao
"... We present a fully coupled electromechanical model of the heart. The model integrates cardiac electrophysiology and cardiac mechanics through excitation-induced contraction and deformation-induced current. Numerical schemes based on finite element were implemented in a supercomputer. Numerical exam ..."
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We present a fully coupled electromechanical model of the heart. The model integrates cardiac electrophysiology and cardiac mechanics through excitation-induced contraction and deformation-induced current. Numerical schemes based on finite element were implemented in a supercomputer. Numerical

STUDY ON ELECTROMECHANICAL COUPLING COEFFICIENTS OF SURFACE ACOUSTIC WAVES IN LAYERED SYSTEMS

by Yung-Yu Chen , Jin-Cheng Hsu , Tsung-Tsong Wu , 2004
"... ABSTRACT The aim of this paper is to utilize the effective permittivity approach to calculate the electromechanical coupling coefficients of surface acoustic waves in layered systems. The effective permittivity offers a direct relation to the voltage-induced charge density at the interface, and can ..."
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, and can be used to calculate the phase velocity dispersion and the electromechanical coupling coefficients of a layered piezoelectric medium exactly. In this paper, the formulation based on the matrix method for calculating the effective permittivity of a layered piezoelectric medium with three types

Left Ventricular Model Using Second Order Electromechanical Coupling: Effects of Viscoelastic Damping

by Elie H. Karam, Antoine B. Abche
"... Abstract—It is known that the heart interacts with and adapts to its venous and arterial loading conditions. Various experimental studies and modeling approaches have been developed to investigate the underlying mechanisms. This paper presents a model of the left ventricle derived based on nonlinear ..."
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on nonlinear stress-length myocardial characteristics integrated over truncated ellipsoidal geometry, and second-order dynamic mechanism for the excitation-contraction coupling system. The results of the model presented here describe the effects of the viscoelastic damping element of the electromechanical

Dynamic Modeling and Response of a Rotating Cantilever Beam with a Concentrated Mass

by Yang Yong-Feng , Wang , Yan-Lin , Chen Hu , Wu Min-Juan
"... The rigid-flexible coupling system with a hub and concentrated mass is studied in this paper. Considering the second-order coupling of axial displacement which is caused by transverse deformation of the beam, the dynamic equations of the system are established using the second Lagrange equation and ..."
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The rigid-flexible coupling system with a hub and concentrated mass is studied in this paper. Considering the second-order coupling of axial displacement which is caused by transverse deformation of the beam, the dynamic equations of the system are established using the second Lagrange equation

DYNAMIC INVESTIGATIONS OF ELECTROMECHANICAL COUPLING EFFECTS IN THE MECHANISM DRIVEN BY THE STEPPING MOTOR

by Tomasz Szolc , Andrzej Pochanke , 2012
"... In the paper, an analysis of transient and steady-state electro-mechanical vibrations of a precise drive system driven by a stepping motor is performed. These theoretical investigations are based on a hybrid structural model of the mechanical system as well as on the classical circuit model of the ..."
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of the stepping motor. The main purpose of these studies is to indicate essential differences between the torsional dynamic responses obtained for the considered object regarded respectively as electro-mechanically coupled and uncoupled. From the computational results, it follows that these differences

Electromechanical Coupling in Tubular Muscle Fibers I I. Resistance and Capacitance

by Of One Transverse Tubule
"... ABSTRACT In tubular muscle fibers of the yellow scorpion the transverse tubules are arranged in a radial symmetry. This particular morphology, enables one to derive values for electrical components of one transverse tubule (TT) by treating the TT as a core conductor rather than a complex network. Th ..."
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. The electrical properties of tubular muscle fibers were completely characterized and analyzed by measuring two independent functions of frequency, i.e., the characteristic impedance and the propagation function. The impedance of a single tubular muscle fiber was determined with microelectrodes over the frequency

Electromechanical Dynamics of simply-supported micro-plates

by Drj. Srinivas
"... This paper presents electromechanical coupled dynamic model of micro- plate subjected to electrostatic excitation. Equations of motion of laterally deformed thin plate are obtained analytically. The static displacement and dynamic characteristics of microplate are depicted as closed-form solutions a ..."
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This paper presents electromechanical coupled dynamic model of micro- plate subjected to electrostatic excitation. Equations of motion of laterally deformed thin plate are obtained analytically. The static displacement and dynamic characteristics of microplate are depicted as closed-form solutions

Electromechanical Coupling Factors of Novel 0-3-0 Composites Based on PMN-xPT Single Crystals

by V Yu Topolov , C R Bowen , P Bisegna , 2011
"... This paper is devoted to the problem of the electromechanical coupling of advanced Single crystals (SCs) of relaxor-ferroelectric solid solutions of with perovskite-type structure are of interest as highly effective components of advanced piezo-active composites. Electromechanical coupling is one o ..."
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This paper is devoted to the problem of the electromechanical coupling of advanced Single crystals (SCs) of relaxor-ferroelectric solid solutions of with perovskite-type structure are of interest as highly effective components of advanced piezo-active composites. Electromechanical coupling is one

Characterizing and Predicting Program Behavior and its Variability

by Evelyn Duesterwald, Sandhya Dwarkadas - In International Conference on Parallel Architectures and Compilation Techniques , 2003
"... To reach the next level of performance and energy efficiency, optimizations are increasingly applied in a dynamic and adaptive manner. Current adaptive systems are typically reactive and optimize hardware or software in response to detecting a shift in program behavior. We argue that program behavio ..."
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be different, periodicity in the behavior is shared across metrics. We exploit these characteristics in the design of on-line statistical and table-based predictors. We introduce a new class of predictors, cross-metric predictors, that use one metric to predict another, thus making possible an efficient

An electromechanical finite element model for piezoelectric energy harvester plates

by Carlos De Marqui Junior , Alper Erturk , Daniel J Inman
"... a b s t r a c t Vibration-based energy harvesting has been investigated by several researchers over the last decade. The goal in this research field is to power small electronic components by converting the waste vibration energy available in their environment into electrical energy. Recent literat ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
which has not been covered in the energy harvesting literature. In this paper, an electromechanically coupled finite element (FE) plate model is presented for predicting the electrical power output of piezoelectric energy harvester plates. Generalized Hamilton's principle for electroelastic bodies
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