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Journal articles on the topic 'Electric waves Wave mechanics'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

YUAN, XIAOGUANG, and Z. H. ZHU. "WAVE REFLECTION IN PIEZOELECTRIC HALF-PLANE." International Journal of Applied Mechanics 05, no. 02 (2013): 1350014. http://dx.doi.org/10.1142/s1758825113500142.

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The assumption of quasi-static electric field in the problem of wave reflection in piezoelectric half-plane results in missing an independent electric wave mode at the piezoelectric boundary, which leads to oversimplified solutions of reflected waves in a strong piezoelectric medium if only elastic bulk wave boundary conditions are considered. The paper presents a novel solution to address the issue by using the inhomogeneous wave theory and introducing a virtual reflection wave mode in addition to the elastic bulk wave modes. The virtual wave is assumed to satisfy the Snell's law as well as t

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Panahov, G., E. Abbasov, S. Bakhtiyarov, and P. Museibli. "An Effect of Electrokinetics Phenomena on Nonlinear Wave Propagation in Bubbly Liquids." International Journal of Applied Mechanics and Engineering 26, no. 3 (2021): 177–86. http://dx.doi.org/10.2478/ijame-2021-0043.

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Abstract A study of nonlinear waves in liquid-gas mixtures with the consideration of internal effects is an important problem of both the fundamental and the applied fluid mechanics. Investigation of nonlinear waves in the gas-liquid mixtures with allowance for internal effects is an important task of both fundamental and applied fluid mechanics. These problems often arise in industrial processes such as oil and gas production, hydrocarbons pipeline transportation, gas-saturated fluids flow in pipelines, etc. In this work, we investigate the effect of the internal electric field on the nonline

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3

Muhammad, Ibrahim, and Hao Bai. "Circumferential and Spiral Waves in Piezoelectric Cylinders." Advanced Materials Research 622-623 (December 2012): 142–46. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.142.

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Study of the guided waves in piezoelectric cylinders based on a semi-analytical finite element method is presented. In the study, the dispersion equation was formulated as a generalized eigenvalue problem by treating mechanical displacements and electric potential with one dimensional quadratic finite element model through the thickness of the cylinder. Here the general eigenvalue problem is depended on three parameters, namely, the frequency, the axial wave number and the circumferential wave. A non-integer circumferential wave is introduced here for studying the guided spiral wave. A wave sp

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4

Soebyakto, Soebyakto. "ECONOMIC EVALUATION OF POWER WAVES AT THE BEACH TEGAL." Jurnal Teknosains 6, no. 1 (2017): 1. http://dx.doi.org/10.22146/teknosains.5125.

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Observations of electric power of the waves hitting beach Tegal is obtained by finding the value of the speed, frequency and height of the waves on the beach Tegal. The average value of the wave velocity of 0.15 m/s, the average frequency of 0.17 Hz and a maximum height of 0.6 m on average. This data is still too low to generate electrical power from the mechanical power of the waves. We are still conducting research to increase the speed and height of the waves with a method of "Tapered Channel". This method is expected to raise the value of the wave height of 0.5 m to 2.2 m. Waves of electri

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Blyth, M. G., and E. I. Părău. "Solitary waves on a ferrofluid jet." Journal of Fluid Mechanics 750 (June 9, 2014): 401–20. http://dx.doi.org/10.1017/jfm.2014.275.

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AbstractThe propagation of axisymmetric solitary waves on the surface of an otherwise cylindrical ferrofluid jet subjected to a magnetic field is investigated. An azimuthal magnetic field is generated by an electric current flowing along a stationary metal rod which is mounted along the axis of the moving jet. A numerical method is used to compute fully nonlinear travelling solitary waves, and the predictions of elevation waves and depression waves made by Rannacher and Engel (New J. Phys., vol. 8, 2006, pp. 108–123) using a weakly nonlinear theory are confirmed in the appropriate ranges of th

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Doak, A., T. Gao, J. M. Vanden-Broeck, and J. J. S. Kandola. "Capillary-gravity waves on the interface of two dielectric fluid layers under normal electric fields." Quarterly Journal of Mechanics and Applied Mathematics 73, no. 3 (2020): 231–50. http://dx.doi.org/10.1093/qjmam/hbaa009.

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Summary In this article, we consider capillary-gravity waves propagating on the interface of two dielectric fluids under the influence of normal electric fields. The density of the upper fluid is assumed to be much smaller than the lower one. Linear and weakly nonlinear theories are studied. The connection to the results in other limit configurations is discussed. Fully nonlinear computations for travelling wave solutions are achieved via a boundary integral equation method. Periodic waves, solitary waves and generalised solitary waves are presented. The bifurcation of generalised solitary wav

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Doak, A., and J. M. Vanden-Broeck. "Travelling wave solutions on an axisymmetric ferrofluid jet." Journal of Fluid Mechanics 865 (February 19, 2019): 414–39. http://dx.doi.org/10.1017/jfm.2019.60.

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We consider a potential flow model of axisymmetric waves travelling on a ferrofluid jet. The ferrofluid coats a copper wire, through which an electric current is run. The induced azimuthal magnetic field magnetises the ferrofluid, which in turn stabilises the well known Plateau–Rayleigh instability seen in axisymmetric capillary jets. This model is of interest because the stabilising mechanism allows for axisymmetric magnetohydrodynamical solitary waves. A numerical scheme capable of computing steady periodic, solitary and generalised solitary wave solutions is presented. It is found that the

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8

Zhang, Xiaoming, Shunli Liang, Xiaoming Han, and Zhi Li. "Computation of Propagating and Non-Propagating Lamb-Like Wave in a Functionally Graded Piezoelectric Spherical Curved Plate by an Orthogonal Function Technique." Materials 11, no. 12 (2018): 2363. http://dx.doi.org/10.3390/ma11122363.

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Non-propagating waves have great potential for crack evaluation, but it is difficult to obtain the complex solutions of the transcendental dispersion equation corresponding to the non-propagating wave. This paper presents an analytical approach based on the orthogonal function technique to investigate non-propagating Lamb-like waves in a functionally graded piezoelectric spherical curved plate. The presented approach can transform the set of partial differential equations for the acoustic waves into an eigenvalue problem that can give the generally complex wave numbers and the field profiles.

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Velez, Carlos, Zhihua Qu, Kuo-Chi Lin, and Shiyuan Jin. "Design, Modeling and Optimization of an Ocean Wave Power Generation Buoy." Marine Technology Society Journal 48, no. 4 (2014): 51–60. http://dx.doi.org/10.4031/mtsj.48.4.6.

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Abstract Ocean waves provide an abundant, clean, and renewable source of energy. Existing systems, typically hydraulic turbines powered by high-pressure fluids, are very large in size and costly. Additionally, they require large ocean waves in which to operate. This paper details the design, development, and laboratory prototype testing of a wave power generation system comprising a buoy that houses a set of mechanical devices and a permanent magnetic generator. The buoy, floating on the surface of the ocean, utilizes the vertical movement of ocean waves to pull on a chain anchored to the ocea

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Kang, Youn J., and Yeunwoo Cho. "Gravity–capillary jet-like surface waves generated by an underwater bubble." Journal of Fluid Mechanics 866 (March 18, 2019): 841–64. http://dx.doi.org/10.1017/jfm.2019.135.

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Jet-like surface waves generated by an electric-spark-generated underwater bubble are experimentally studied. Three different motions of jet-like surface waves are observed depending on the inception position of the bubble ($d$: 0.28–7 mm) below the free surface and the maximum radius of the bubble ($R_{m}$: 1.5–3.6 mm). When $d/R_{m}>1.3$, the surface wave shows a simple smooth hump (case 1). When $0.82<d/R_{m}<1.3$, a single droplet or multiple droplets are pinched off sequentially or simultaneously at the tip or from some points of the jet-like surface wave (case 2). Finally, when

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11

Zhang, Bin, Benjamin Ducharne, Bhaawan Gupta, Gael Sebald, Daniel Guyomar, and Jun Gao. "Experimental sea wave energy extractor based on piezoelectric Ericsson cycles." Journal of Intelligent Material Systems and Structures 29, no. 6 (2017): 1102–12. http://dx.doi.org/10.1177/1045389x17730917.

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Recycling ambient energies with electric generators instead of employing batteries with limited lifespans has motivated a large scientist community over two decades. Sea waves exhibit a large energy density. The amount of energy that could be extracted from the sea waves is very high. This work describes a technique of sea wave energy extraction based on a piezoelectric conversion and an analogy with thermodynamic Ericsson loops. By synchronizing external electric field to the maximum and the minimum of the sea wave mechanical stress excitations, the piezoelectric material dielectric hysteresi

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Iida, Takahito, and Masashi Kashiwagi. "Small water channel network for designing wave fields in shallow water." Journal of Fluid Mechanics 849 (June 15, 2018): 90–110. http://dx.doi.org/10.1017/jfm.2018.355.

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A small water channel network is proposed for designing shallow water fields, and the network is applied to attain water wave cloaking. The design formula is derived from an analogy between waves in a water channel and in an electric circuit; an approach of a transmission line metamaterial is extended to water waves and the water channel is used as an alternative of the transmission line. The size of the water channel is sufficiently smaller than the wavelength and a number of the channels are periodically connected as a network. This small water channel network makes artificial wave fields, a

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13

Cui, Zhiwen, Jinxia Liu, Yujun Zhang, Kexie Wang, and Hengshan Hu. "Simulation of Monopole and Multipole Seismoelectric Logging." Advances in Acoustics and Vibration 2011 (March 27, 2011): 1–10. http://dx.doi.org/10.1155/2011/107827.

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In a fluid-saturated porous formation, acoustics and electromagnetic waves are coupled based on Pride seismoelectric theory. An exact treatment of the nonaxisymmetric seismoelectric field excited by acoustic multipole sources is presented. The frequency wavenumber domain representations of the acoustic field and associated seismoelectric field due to acoustic multipole sources are formulated. The full waveforms of acoustic waves and electric and magnetic fields in the time domain propagation in borehole are simulated by using discrete wave number integration, and frequency versus axial-wave nu

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14

Crawford, Mark. "Waves, Currents and Electric Potential." Mechanical Engineering 135, no. 02 (2013): 30–35. http://dx.doi.org/10.1115/1.2013-feb-2.

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This article discusses various aspects and uses of hydrokinetics in the turbine industry. Hydrokinetics is a rapidly developing field, where both big companies and start-ups can compete equally in engineering and design. Designs for hydrokinetic devices continue to evolve. The most popular hydrokinetic device is the turbine. As these turbines are installed underwater, which is much denser than air, hydrokinetic turbines provide much more power than wind turbines at relatively low water current speeds. Considerable research and development are being conducted on three aspects of hydrokinetics t

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15

Anosov, V. "Efficiency of wave energy conversion into electric power: calculation results." Transactions of the Krylov State Research Centre 2, no. 396 (2021): 139–48. http://dx.doi.org/10.24937/2542-2324-2021-2-396-139-148.

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Object and purpose of research. The object of the study is the wave energy converters (WEC) into electric power. The purpose of the study is to draw up a differential equation describing the operation of the WEC, its solution and determination for the design parameters influence of the WEC on the efficiency of energy conversion. Materials and methods. The theoretical methods adopted in ship mechanics and theory are used to study the operation of complex mechanisms and dynamics of marine objects. The data on the characteristics of electric generators are used. Main results. The differential equ

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16

Im, Kwang-Hee, Je-Woong Park, In-Young Yang, and David Kuei Hsu. "Influence of electric field direction of terahertz radiation on composite materials." Journal of Composite Materials 54, no. 12 (2016): 1603–12. http://dx.doi.org/10.1177/0021998316688592.

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Terahertz waves (T-ray) for the non-destructive evaluation were investigated on composite materials. The modalities of the T-ray radiation used were time domain spectroscopy and continuous wave for composites. The composite materials are composed of non-conducting polymeric composites and carbon fiber composites. T-ray signals in the time domain spectroscopy mode resembles that of ultrasound; however, unlike ultrasound, T-ray pulse can detect a crack hidden behind a larger crack (shadow effect). Thick glass fiber reinforced polymer laminates containing double-saw slots was demonstrated. Also,

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17

Zhang, Xiaoming, Chuanzeng Zhang, Jiangong Yu, and Jing Luo. "Full dispersion and characteristics of complex guided waves in functionally graded piezoelectric plates." Journal of Intelligent Material Systems and Structures 30, no. 10 (2019): 1466–80. http://dx.doi.org/10.1177/1045389x19836168.

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The improvement of the resolution and energy conversion efficiency of piezoelectric devices requires a thorough study of guided wave, especially the evanescent wave modes with high-phase speed and low attenuation. Due to the computation difficulties, investigations about the evanescent wave in piezoelectric structures are rather limited. In this article, an analytic method based on the orthogonal function technique is presented to investigate the complex dispersion relations and the evanescent guided wave in functionally graded piezoelectric plates, which can convert the complex partial differ

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18

Zloshchastiev, Konstantin G. "Density Operator Approach to Turbulent Flows in Plasma and Atmospheric Fluids." Universe 6, no. 11 (2020): 216. http://dx.doi.org/10.3390/universe6110216.

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We formulate a statistical wave-mechanical approach to describe dissipation and instabilities in two-dimensional turbulent flows of magnetized plasmas and atmospheric fluids, such as drift and Rossby waves. This is made possible by the existence of Hilbert space, associated with the electric potential of plasma or stream function of atmospheric fluid. We therefore regard such turbulent flows as macroscopic wave-mechanical phenomena, driven by the non-Hermitian Hamiltonian operator we derive, whose anti-Hermitian component is attributed to an effect of the environment. Introducing a wave-mechan

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19

Han, Qiyu, and Zhijing (Zee) Wang. "Time‐domain simulation of SH-wave‐induced electromagnetic field in heterogeneous porous media: A fast finite‐element algorithm." GEOPHYSICS 66, no. 2 (2001): 448–61. http://dx.doi.org/10.1190/1.1444936.

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When a horizontally polarized rotational mechanical wave (SH-wave) travels through a porous rock, acceleration of the rock frame induces a streaming current in the SH particle motion plane. This streaming current is parallel to the particle displacement and has an associated electromagnetic (EM) field. This phenomenon is often described as the electroseismic (EOS) conversion. Numerically, the EOS phenomenon can be simulated in either the frequency or the time domain. Frequency‐domain numerical simulation has huge memory and computational requirements. Traditional time‐domain simulation, on the

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20

Chang, Donald C. "Review on the physical basis of wave–particle duality: Conceptual connection between quantum mechanics and the Maxwell theory." Modern Physics Letters B 35, no. 13 (2021): 2130004. http://dx.doi.org/10.1142/s0217984921300040.

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A well-known mystery in quantum mechanics is wave–particle duality: Is an electron a point mass or a physical wave? What is the physical meaning of its wave function? About a hundred years ago, there was a famous debate between Bohr and Einstein on this topic. Their question is still open today. This paper reviews a new theoretical framework to address this problem. Here, it is hypothesized that both photons and electrons are quantized excitation waves of the vacuum, the physical properties of which can be modeled based on the Maxwell theory. Using the method of Helmholtz decomposition, one ca

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21

Oprea, Răzvan Andrei, Gabriel Popa, and Marius Alin Gheţi. "Waves in electric contact wires subjected to transversal impulses." MATEC Web of Conferences 178 (2018): 05004. http://dx.doi.org/10.1051/matecconf/201817805004.

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It is a well-known fact that the raising of the pantograph is followed by an electric arch. The reasons for this phenomenon are the oscillations of the pantograph and the oscillations of the contact line. Initially, these oscillations are not coupled. In this case, the mechanical contact between the two subsystems may be lost, and may generate electric arch. In the present work, the pantograph rising is modelled through a Dirac impulse. An analytic solution of the transverse waves is obtained by means of Fourier series. A phenomenological model of the wave attenuation is taken into account.

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22

SCHMITT, DENYS, T. ALBOUSSIÈRE, D. BRITO, et al. "Rotating spherical Couette flow in a dipolar magnetic field: experimental study of magneto-inertial waves." Journal of Fluid Mechanics 604 (May 14, 2008): 175–97. http://dx.doi.org/10.1017/s0022112008001298.

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The magnetostrophic regime, in which Lorentz and Coriolis forces are in balance, has been investigated in a rapidly rotating spherical Couette flow experiment. The spherical shell is filled with liquid sodium and permeated by a strong imposed dipolar magnetic field. Azimuthally travelling hydromagnetic waves have been put in evidence through a detailed analysis of electric potential differences measured on the outer sphere, and their properties have been determined. Several types of wave have been identified depending on the relative rotation rates of the inner and outer spheres: they differ b

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Vegt, Wim. "The Illusion of Quantum Mechanical Probability Waves." European Journal of Engineering Research and Science 5, no. 10 (2020): 1212–24. http://dx.doi.org/10.24018/ejers.2020.5.10.2153.

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An important milestone in quantum physics has been reached by the publication of the Relativistic Quantum Mechanical Dirac Equation in 1928. However, the Dirac equation represents a 1-Dimensional quantum mechanical equation which is unable to describe the 4-Dimensional Physical Reality. In this article the 4-Dimensional Relativistic Quantum Mechanical Dirac Equation expressed in the vector probability functions and the complex conjugated vector probability function will be published. To realize this, the classical boundaries of physics has to be changed. It is necessary to go back in tim

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Zhang, Bo, Jiangong Yu, Lahoucine Elmaimouni, and Xiaoming Zhang. "Magneto-Electric Effect on Guided Waves in Functionally Graded Piezoelectric–Piezomagnetic Fan-Shaped Cylindrical Structures." Materials 11, no. 11 (2018): 2174. http://dx.doi.org/10.3390/ma11112174.

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Functionally graded piezoelectric–piezomagnetic (FGPP) material simultaneously consists of piezomagnetic and piezoelectric phases, which are able to convert energy among mechanical, electric, and magnetic fields. The magneto-electric effect on waves in FGPP fan-shaped cylindrical structures is studied by exploiting the double Legendre orthogonal polynomial method. By means of the Heaviside function, the initial conditions are brought into wave motion equations. Dispersion properties, electric and magnetic potential, and the Poynting vector are calculated. Subsequently, the effect of the graded

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AWASTHI, MUKESH KUMAR. "STUDY ON ELECTROHYDRODYNAMIC CAPILLARY INSTABILITY OF VISCOELASTIC FLUIDS WITH RADIAL ELECTRIC FIELD." International Journal of Applied Mechanics 06, no. 04 (2014): 1450037. http://dx.doi.org/10.1142/s1758825114500379.

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We study the linear analysis of electrohydrodynamic capillary instability of the interface between a viscous fluid and viscoelastic fluid of Maxwell type, when the phases are enclosed between two horizontal cylindrical surfaces coaxial with the interface, and when fluids are subjected to the radial electric field. Here, we use an irrotational theory known as viscous potential flow (VPF) theory in which viscosity enters through normal stress balance but shearing stresses are assumed to be zero. A quadratic dispersion relation that accounts for the growth of axisymmetric waves is obtained and st

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Vegt, Wim. "4-Dimensional Relativistic Quantum Mechanical Equilibrium in Gravitational-Electromagnetic Confinements." International Science Review 1, no. 2 (2020): 34–61. http://dx.doi.org/10.47285/isr.v1i2.59.

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An important milestone in quantum physics was reached by the publication of the Relativistic Quantum Mechanical Dirac Equation in 1928. However, the Dirac equation represents a 1-Dimensional quantum mechanical equation which is unable to describe the 4-Dimensional Physical Reality. In this article, the 4-Dimensional Relativistic Quantum Mechanical Dirac Equation expressed in the vector probability functions and the complex conjugated vector probability function will be discussed. To realize this, the classical boundaries of physics has to be changed. It is necessary to go back in time more tha

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27

Zhang, Xiaoming, Zhi Li, and Jiangong Yu. "Complex dispersion solutions for guided waves and properties of non-propagating waves in a piezoelectric spherical plate." Advances in Mechanical Engineering 10, no. 12 (2018): 168781401882069. http://dx.doi.org/10.1177/1687814018820693.

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The vibration modes of an elastic plate are usually divided into propagating and non-propagating (evanescent) kinds. Non-propagating wave modes are very important for guided wave inspection of defect size and shape. But it is difficult to obtain the complex solutions of the transcendental dispersion equation, corresponding to the non-propagating wave. In this article, we present an improved Legendre polynomial method to calculate the complex-valued dispersion and study properties of the non-propagating wave in a piezoelectric spherical plate. Comparisons with other related studies are conducte

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Ashley, Steven. "Sound Waves At Work." Mechanical Engineering 120, no. 03 (1998): 80–84. http://dx.doi.org/10.1115/1.1998-mar-2.

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Researchers have devised a new technique to use sound waves, opening the way for simple acoustic compressors, speedy chemical-process reactors, and clean electric-power generators. MacroSonix Corp. in Richmond, Vermont, has developed a technique by which standing sound waves resonating in specially shaped closed cavities can be loaded with thousands of times more energy than was previously possible. Company’s wave-shaping technology is known as resonant macrosonic synthesis (RMS). With some clever engineering, he said, the elevated acoustic-energy levels produced using RMS can be tapped for a

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Yu, J. G., and X. F. Dong. "Elastic Waves in Piezoelectric Spherical Curved Plates." Key Engineering Materials 455 (December 2010): 672–77. http://dx.doi.org/10.4028/www.scientific.net/kem.455.672.

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Based on linear three-dimensional piezoelasticity, an orthogonal polynomial approach is used for determining the elastic wave characteristics of piezoelectric spherical curved plates. The displacement components and electric potential, expanded in a series of Legendre polynomials, are introduced into the governing equations along with position-dependent material constants so that the solution of the wave equation is reduced to an eigenvalue problem. Guided wave dispersion curves for PZT-4 spherical curved plates are calculated. Corresponding mechanical displacement and electric potential distr

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30

Blyth, M. G., D. Tseluiko, T. S. Lin, and S. Kalliadasis. "Two-dimensional pulse dynamics and the formation of bound states on electrified falling films." Journal of Fluid Mechanics 855 (September 14, 2018): 210–35. http://dx.doi.org/10.1017/jfm.2018.592.

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The flow of an electrified liquid film down an inclined plane wall is investigated with the focus on coherent structures in the form of travelling waves on the film surface, in particular, single-hump solitary pulses and their interactions. The flow structures are analysed first using a long-wave model, which is valid in the presence of weak inertia, and second using the Stokes equations. For obtuse angles, gravity is destabilising and solitary pulses exist even in the absence of an electric field. For acute angles, spatially non-uniform solutions exist only beyond a critical value of the elec

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Sun, Yun, Jiang Xu, Chaoyue Hu, Guang Chen, and Yunfei Li. "A flexural mode guided wave transducer for pipes based on magnetostrictive effect." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (2020): 335–42. http://dx.doi.org/10.3233/jae-209338.

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The flexural mode guided waves of pipes which are sensitive the axial crack and suitable for wave focused gain more attention recently. In this paper, a non-contact flexural mode guided wave transducer based on magnetostrictive effect is provided for pipes. Based on the magnetostrictive transduction principle and the wave structure of the flexural mode guided wave, the sensing method for generating and receiving the flexural mode guided waves based on magnetostrictive effect is obtained. According to the theoretical analysis, a non-contact magnetostrictive transducer for F (3, m) mode guided w

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Fan, Zhanfeng, and Jianhua Cai. "Effects of Unidirectional In Situ Stress on Crack Propagation of a Jointed Rock Mass Subjected to Stress Wave." Shock and Vibration 2021 (August 30, 2021): 1–13. http://dx.doi.org/10.1155/2021/5529540.

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This paper proposes a large-scale experiment combined with multiple cement mortar blocks to simulate stress wave propagation across a jointed rock mass under unidirectional in situ stress. Two identical mortar block models with smooth, dry, and unfilled joints were poured. The stress waves in Model 1 and Model 2 were generated by an electric spark source and a blast-induced source, respectively. The effects of these two excitation sources on stress wave propagation were compared through crack propagation experiments. The experimental results show that the peak value of the transmitted strain w

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COTOR, Dragos Corneliu, Gabriel GAJAILA, Aurel DAMIAN, et al. "Research on the Values of Amplitudes of Electrocardiographic Waves Depending on Age in Kids." Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Veterinary Medicine 77, no. 2 (2020): 80. http://dx.doi.org/10.15835/buasvmcn-vm:2020.0019.

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The electrocardiogram (ECG) is a graphical recording of the cardiac electric activity during cardiac revolutions. This bio-current triggers and maintains the mechanical activity of the heart. Within this research, the amplitudes values of the electrocardiographic waves were determined in 6 leads: I, II, III, aVL, aVR and aVF. Thus, some electrocardiograms were recorded using limb lead in clinically healthy kids, aged 1 month, 3 months and 5 months, in order to achieve the proposed objectives. Then, the statistical analysis of the obtained results was performed using t (student) test.As a conse

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Tonomura, Akira. "The Aharonov-Bohm Effect and Its Applications to Magnetic Field Observation." Asia Pacific Physics Newsletter 02, no. 01 (2013): 26–36. http://dx.doi.org/10.1142/s2251158x13000076.

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This article describes the Aharonov-Bohm (AB) effect of electron waves travelling in free space and its application to the observation of gauge fields (vector potentials). The AB effect is inconceivable in classical physics since an observable effect is produced on electrons passing through field-free spaces. Electrons can be affected only by Lorentz forces due to electromagnetic fields. The situation is different in quantum mechanics, where electrons show wave properties: the concept of force is no longer relevant, so electric field E and magnetic field B, defined as forces acting on a unit c

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Yang, Jiashi, and Yuantai Hu. "Mechanics of electroelastic bodies under biasing fields." Applied Mechanics Reviews 57, no. 3 (2004): 173–89. http://dx.doi.org/10.1115/1.1689411.

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This is a review article on the mechanics of small-amplitude motions superposed on finite biasing or initial fields in an electroelastic body. It begins with a summary of the nonlinear theory of electroelasticity, which is the theoretical foundation for the theory of small fields superposed on a bias. This theory, obtained by different approaches, and the development of structural theories for electroelastic beams, plates, and shells under biasing fields are discussed. Applications of these theories for small fields superposed on biasing fields in the buckling of thin electroelastic structures

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Fan, Yu, Manuel Collet, Mohamed Ichchou, Olivier Bareille, and Lin Li. "Wave Electromechanical Coupling Factor for the Guided Waves in Piezoelectric Composites." Materials 11, no. 8 (2018): 1406. http://dx.doi.org/10.3390/ma11081406.

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A novel metrics termed the ‘wave electromechanical coupling factor’ (WEMCF) is proposed in this paper, to quantify the coupling strength between the mechanical and electric fields during the passage of a wave in piezoelectric composites. Two definitions of WEMCF are proposed, leading to a frequency formula and two energy formulas for the calculation of such a factor. The frequency formula is naturally consistent with the conventional modal electromechanical coupling factor (MEMCF) but the implementation is difficult. The energy formulas do not need the complicated wave matching required in the

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Rekatsinas, Christoforos S., and Dimitris A. Saravanos. "A time domain spectral layerwise finite element for wave structural health monitoring in composite strips with physically modeled active piezoelectric actuators and sensors." Journal of Intelligent Material Systems and Structures 28, no. 4 (2016): 488–506. http://dx.doi.org/10.1177/1045389x16649700.

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A new explicit, two-dimensional plane strain, time domain spectral finite element is developed to enhance the simulation of guided waves generated by active piezoelectric sensors in laminated composite strips. A new multi-field layerwise theory is formulated for composite laminates with piezoelectric actuators and sensors which captures straight-crested symmetric and anti-symmetric Lamb waves. Third-order Hermite polynomial splines are employed for the approximation of displacements and electric potential through the thickness, and the piezoelectric actuators and sensors are physically modeled

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Du, Xiaozhen, Yan Zhao, Guilin Liu, Mi Zhang, Yu Wang, and Hong Yu. "Enhancement of the Piezoelectric Cantilever Beam Performance via Vortex-Induced Vibration to Harvest Ocean Wave Energy." Shock and Vibration 2020 (September 14, 2020): 1–11. http://dx.doi.org/10.1155/2020/8858529.

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Renewable and sustainable energies exhibit promising performance while serving as the power supply of a wireless sensor especially located in marine waters. Various microgenerators have been developed to harvest wave energy. However, the conversion ability from a dynamic oscillating source of wave is crucial to enhance their effectiveness in practical applications. In this paper, a new piezoelectric converter system is proposed to harvest the kinetic energy from ocean waves. The vortex-induced effect in an air channel enhances the vibration performance, improving the energy harvesting efficien

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French, M. J. "Tadpole: A Design Problem in the Mechanics of the Use of Sea Wave Energy." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 210, no. 4 (1996): 273–77. http://dx.doi.org/10.1243/pime_proc_1996_210_046_02.

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A study is made of a device for obtaining electrical energy from sea waves, in which the problem of providing a reaction against the wave forces is met by a combination of a pendulum and gyroscopes. The mechanics is developed in a logical manner which gives a clear insight into the function, the pendulum providing the reaction force, which leaves an unbalanced moment to be countered by the gyroscopes, which also constitute the power take-off. The result is a relatively small machine with no external moving parts. The treatment requires no understanding of wave hydrodynamics. It is felt this pa

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Lee, Siu-Chun. "Effective Propagation Constant of Fibrous Media Containing Parallel Fibers in the Dependent Scattering Regime." Journal of Heat Transfer 114, no. 2 (1992): 473–78. http://dx.doi.org/10.1115/1.2911297.

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The radiative properties of a particulate medium are strongly influenced by the particle concentration and wavelength of the incident radiation. Independent scattering prevails at very low particle concentration, such that the spacing between the particles is much larger than the particle size and incident wavelength. As the particle spacing decreases, near-field multiple scattering and far-field interference of the scattered waves become increasingly pronounced. These dependent scattering effects cause the extinction efficiency and the phase velocity of electromagnetic waves, which are relate

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Gurtug, O., M. Halilsoy, and S. Habib Mazharimousavi. "Quantum Probes of Timelike Naked Singularities in2+1-Dimensional Power-Law Spacetimes." Advances in High Energy Physics 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/684731.

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The formation of naked singularities in2+1-dimensional power-law spacetimes in linear Einstein-Maxwell and Einstein-scalar theories sourced by azimuthally symmetric electric field and a self-interacting real scalar field, respectively, are considered in view of quantum mechanics. Quantum test fields obeying the Klein-Gordon and Dirac equations are used to probe the classical timelike naked singularities developed atr=0. We show that when the classically singular spacetimes probed with scalar waves, the considered spacetimes remain singular. However, the spinorial wave probe of the singularity

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Li, Li, and P. J. Wei. "Propagation of Surface Waves in a Homogeneous Layer of Finite Thickness over an Initially Stressed Functionally Graded Magnetic-Electric-Elastic Half-Space." Journal of Theoretical and Applied Mechanics 45, no. 1 (2015): 69–86. http://dx.doi.org/10.1515/jtam-2015-0005.

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Abstract The propagation behaviour of Love wave in an initially stressed functionally graded magnetic-electric-elastic half-space carrying a homogeneous layer is investigated. The material parameters in the substrate are assumed to vary exponentially along the thickness direction only. The velocity equations of Love wave are derived on the electrically or magnetically open circuit and short circuit boundary conditions, based on the equations of motion of the graded magnetic-electric-elastic mate- rial with the initial stresses and the free traction boundary conditions of surface and the contin

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Wang, Ziping, Yangchun Ye, Zhujie Bao, and Hao Ge. "Optimization and simulation analysis of structure parameters of OPCM ultrasonic longitudinal wave actuating element." Science and Engineering of Composite Materials 26, no. 1 (2019): 175–82. http://dx.doi.org/10.1515/secm-2017-0394.

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AbstractThe force-electric coupling relationship of the mechanical and electrical properties of piezoelectric composites has been the main factor in the research and development of piezoelectric composites in practical application. A novel orthotropic piezoelectric composite material (OPCM) element is studied in this paper. The properties of the piezoelectric phase and the polymer phase and the influence of the geometrical dimensions of the OPCM on the longitudinal wave drive element are analyzed from the perspective of mechanics and electric power, respectively, and the structural design is o

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Liu, Haitao, and Shuai Zhu. "Dynamic analysis of two collinear permeable Mode-I cracks in piezoelectric materials based on non-local piezoelectricity theory." Multidiscipline Modeling in Materials and Structures 15, no. 6 (2019): 1274–93. http://dx.doi.org/10.1108/mmms-12-2018-0215.

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Purpose Based on the non-local piezoelectricity theory, this paper is concerned with two collinear permeable Mode-I cracks in piezoelectric materials subjected to the harmonic stress wave. The paper aims to discuss this issue. Design/methodology/approach According to the Fourier transformation, the problem is formulated into two pairs of dual integral equations, in which the unknown variables are the displacement jumps across the crack surfaces. Findings Finally, the dynamic non-local stress and the dynamic non-local electric displacement fields near the crack tips are obtained. Numerical resu

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COULLET, P., and F. PLAZA. "EXCITABLE SPIRAL WAVES IN NEMATIC LIQUID CRYSTALS." International Journal of Bifurcation and Chaos 04, no. 05 (1994): 1173–82. http://dx.doi.org/10.1142/s0218127494000873.

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A mechanical analog of the chemical and biological excitable medium is proposed. In nematic liquid crystals, the Freedericksz transition induced by a rotating tilted electric field provides a simple example of such a mechanical excitable system. We study this transition, derive a Ginzburg-Landau model for it, and show that the excitable spiral wave can be produced from a retractable finger-like soliton in this context.

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Romero Menco, Fredys, Ainhoa Rubio-Clemente, and Edwin Chica. "Design of a wave energy converter system for the Colombian Pacific Ocean." Revista Facultad de Ingeniería Universidad de Antioquia, no. 94 (October 17, 2019): 8–23. http://dx.doi.org/10.17533/udea.redin.20190406.

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This paper details the mechanical design of a wave power generation system comprising a buoy that houses a set of mechanical devices and a linear generator. The system proposed transforms the heaving movement of the buoy in a rotational movement of the arm that houses the linear generator. Firstly, the conceptual design and the operation of the system is exposed. Secondly, the conditions of the waves in the zone of interest are presented; in this case, the device was designed to work in the Colombian Pacific Ocean. Afterwards, the dynamic model of the buoy and the linear generator are deduced

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Liu, Hai-Tao, Wen-Juan Wu, and Jian-Guo Wu. "Dynamic non-local stress analysis of two collinear semi-permeable mode-I cracks in a piezoelectric medium." Journal of Intelligent Material Systems and Structures 30, no. 20 (2019): 3100–3112. http://dx.doi.org/10.1177/1045389x19873425.

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This article investigates the dynamic non-local stress analysis of two collinear semi-permeable mode-I cracks in a piezoelectric medium under the harmonic waves by using the generalized Almansi theorem and the Schmidt method. Based on the Fourier transform technique, this problem is formulated into coupled dual integral equations. The dynamic stress and the dynamic electric displacement fields at the crack tips are obtained by solving the derived dual integral equations. Numerical examples are provided to show the effects of the crack length, the distance between the two collinear cracks, the

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Shindo, Y., I. Ohnishi, and S. Tohyama. "Flexural Wave Scattering at a Through Crack in a Conducting Plate Under a Uniform Magnetic Field." Journal of Applied Mechanics 64, no. 4 (1997): 828–34. http://dx.doi.org/10.1115/1.2788988.

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Following a classical plate bending theory of magneto-elasticity, we consider the scattering of time-harmonic flexural waves by a through crack in a conducting plate under a uniform magnetic field normal to the crack surface. An incident wave giving rise to moments symmetric about the crack plane is applied. It is assumed that the plate has the electric and magnetic permeabilities of the free space. By the use of Fourier transforms we reduce the problem to solving a pair of dual integral equations. The solution of the dual integral equations is then expressed in terms of a Fredholm integral eq

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Kozaczka, Eugeniusz, Jacek Domagalski, Grażyna Grelowska, and Ignacy Gloza. "Identification of hydro-acoustic waves emitted from floating units during mooring tests." Polish Maritime Research 14, no. 4 (2007): 40–46. http://dx.doi.org/10.2478/v10012-007-0038-5.

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Identification of hydro-acoustic waves emitted from floating units during mooring tests Measurements of hydro-acoustic noise emitted from vessels are a.o. a subject of the tests carried out in the control measurement ranges of the Navy. The measurements are performed both on anchored and floating vessels. Acoustic field of vessels is changing along with their speed changing and is associated with acoustic activity of wave sources installed in vessel's hull (main engines, electric generating sets, reduction gears, pumps, shaft-lines, piping, ventilating ducts etc) as well as hydro-dynamic sourc

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Bucher, Izhak, Ran Gabai, Harel Plat, Amit Dolev, and Eyal Setter. "Experimental travelling waves identification in mechanical structures." Mathematics and Mechanics of Solids 24, no. 1 (2017): 152–67. http://dx.doi.org/10.1177/1081286517732825.

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Vibrations are often represented as a sum of standing waves in space, i.e. normal modes of vibration. While this can be mathematically accurate, the representation as travelling waves can be compact and more appropriate from a physical point of view, in particular when the energy flux along the structure is meaningful. The quantification of travelling waves assists in computing the energy being transferred and propagated along a structure. It can provide local as well as global information about the structure through which the mechanical energy flows. Presented in this paper is a new method to

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