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Articles de revues sur le sujet « Electro-Beam »

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Auteur : Grafiati
Publié le 28 juin 2023

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1

Barboza, Raouf, Alessandro Alberucci et Gaetano Assanto. « Electro-Optic Beam Steering with Nematicons ». Molecular Crystals and Liquid Crystals 558, no 1 (30 mai 2012) : 12–21. http://dx.doi.org/10.1080/15421406.2011.648069.

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2

Buhl, L. L., et R. C. Alferness. « Ti:LiNbO_3 waveguide electro-optic beam combiner ». Optics Letters 12, no 10 (1 octobre 1987) : 778. http://dx.doi.org/10.1364/ol.12.000778.

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3

Chiu, Y., D. D. Stancil, T. E. Schlesinger et W. P. Risk. « Electro‐optic beam scanner in KTiOPO4 ». Applied Physics Letters 69, no 21 (18 novembre 1996) : 3134–36. http://dx.doi.org/10.1063/1.116806.

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4

Luo, Jingdong. « Electro-optic polymer prism beam deflector ». Optical Engineering 48, no 11 (1 novembre 2009) : 114601. http://dx.doi.org/10.1117/1.3264959.

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5

Kushnir, Uri, et Oded Rabinovitch. « Nonlinear ferro-electro-elastic beam theory ». International Journal of Solids and Structures 46, no 11-12 (juin 2009) : 2397–406. http://dx.doi.org/10.1016/j.ijsolstr.2009.01.016.

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6

Chen, Yuhang, Maomao Zhang, Yaxuan Su et Zhidong Zhou. « Coupling Analysis of Flexoelectric Effect on Functionally Graded Piezoelectric Cantilever Nanobeams ». Micromachines 12, no 6 (21 mai 2021) : 595. http://dx.doi.org/10.3390/mi12060595.

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The flexoelectric effect has a significant influence on the electro-mechanical coupling of micro-nano devices. This paper studies the mechanical and electrical properties of functionally graded flexo-piezoelectric beams under different electrical boundary conditions. The generalized variational principle and Euler–Bernoulli beam theory are employed to deduce the governing equations and corresponding electro-mechanical boundary conditions of the beam model. The deflection and induced electric potential are given as analytical expressions for the functionally graded cantilever beam. The numerical results show that the flexoelectric effect, piezoelectric effect, and gradient distribution have considerable influences on the electro-mechanical performance of the functionally graded beams. Moreover, the nonuniform piezoelectricity and polarization direction will play a leading role in the induced electric potential at a large scale. The flexoelectric effect will dominate the induced electric potential as the beam thickness decreases. This work provides helpful guidance to resolve the application of flexoelectric and piezoelectric effects in functionally graded materials, especially on micro-nano devices.
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7

Thomaschewski, Martin, Christian Wolff et Sergey I. Bozhevolnyi. « High-Speed Plasmonic Electro-Optic Beam Deflectors ». Nano Letters 21, no 9 (30 avril 2021) : 4051–56. http://dx.doi.org/10.1021/acs.nanolett.1c00945.

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8

DelRe, Eugenio, Bruno Crosignani, Paolo Di Porto, Elia Palange et Aharon J. Agranat. « Electro-optic beam manipulation through photorefractive needles ». Optics Letters 27, no 24 (15 décembre 2002) : 2188. http://dx.doi.org/10.1364/ol.27.002188.

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9

Barboza, Raouf, Alessandro Alberucci et Gaetano Assanto. « Large electro-optic beam steering with nematicons ». Optics Letters 36, no 14 (14 juillet 2011) : 2725. http://dx.doi.org/10.1364/ol.36.002725.

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10

Wang, Wei-Chih, et Chi Leung Tsui. « 1-D electro-optic beam steering device ». Sensors and Actuators A : Physical 188 (décembre 2012) : 277–84. http://dx.doi.org/10.1016/j.sna.2011.11.009.

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11

Buchal, Ch. « Ion beam modification of electro-optical crystals ». Nuclear Instruments and Methods in Physics Research Section B : Beam Interactions with Materials and Atoms 59-60 (juillet 1991) : 1142–46. http://dx.doi.org/10.1016/0168-583x(91)95782-9.

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12

Gulyaev D. V., Kolosovsky D. A., Dmitriev D. V., Gutakovskii A. K., Kolosovsky E. A. et Zhuravlev K. S. « InGaAlAs/InAlAs heterostructures for electro-absorption modulator ». Technical Physics Letters 48, no 7 (2022) : 33. http://dx.doi.org/10.21883/tpl.2022.07.54034.19205.

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The structural and optical characteristics of heterostructures with InGaAlAs/InAlAs quantum wells, in which a quaternary alloy is obtained by alternating monolayer growth of InAlAs and InGaAs layers by molecular beam epitaxy, have been investigated. It has been shown that obtained heterostructures are promising for creation of electro-absorption modulators designed for a wavelength of 1.55 μm with the extinction coefficient of more than 20 dB at a voltage of less than 4 V. Keywords: Electro-absorption modulator, molecular beam epitaxy, quantum wells, Stark effect.
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13

Lu, Dong Xun, et Wei Hua Li. « Modeling and Simulation of Opposite Type MATA Using MEMS Nodal Cell Library ». Advanced Materials Research 60-61 (janvier 2009) : 445–49. http://dx.doi.org/10.4028/www.scientific.net/amr.60-61.445.

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In MEMS nodal analysis method, more available libraries of nodal models are needed. By analyzing the mathematic model and the equivalent model of the electro-thermal-mechanical beam, this paper shows the steps of building a library of a nodal element for HSPICE. Then the cell library is used to simulate the opposite type micro-array thermal actuator (MATA). At last it shows the DC sweep performance and the transient performance of opposite type MATA. In this paper, to verify the reusability of the beam cell, opposite type MATA is all consisted of the electro-thermal-mechanical beam cell in library.
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14

Nikas, D., V. Castillo, L. Kowalski, R. Larsen, D. M. Lazarus, C. Ozben, Y. K. Semertzidis, T. Tsang et T. Srinivasan-Rao. « Electro-optical measurements of ultrashort 45 MeV electron beam bunch ». International Journal of Modern Physics A 16, supp01c (septembre 2001) : 1150–52. http://dx.doi.org/10.1142/s0217751x01009168.

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We have made an observation of 45 MeV electron beam bunches using the nondestructive electro-optical (EO) technique. The amplitude of the EO modulation was found to increase linearly with electron beam charge and decrease inversely with the optical beam path distance from the electron beam. The risetime of the signal was bandwidth limited by our detection system to ~ 70 ps. An EO signal due to ionization caused by the electrons traversing the EO crystal was also observed. The EO technique may be ideal for the measurement of bunch structure with femtosecond resolution of relativistic charged particle beam bunches.
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15

Sepehrinour, M., et M. Nezami. « Dynamic Response of an Electro-Rheological Sandwich Beam with Different Elastic Layers Subjected to Simultaneous Impact Loads ». Applied Mechanics and Materials 232 (novembre 2012) : 117–21. http://dx.doi.org/10.4028/www.scientific.net/amm.232.117.

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Dynamic response of an electro-rheological sandwich beam subjected to simultaneous Impact loads will be considered. Analytical solution will be used to draw FRF diagram of the beam for different electric field. Upper and lower layers of the beam have different material properties. Coupled governing equations derived from Hamilton Principle will be solved in frequency domain to find transverse vibration of the beam.
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16

Römer, G. R. B. E., et P. Bechtold. « Electro-optic and Acousto-optic Laser Beam Scanners ». Physics Procedia 56 (2014) : 29–39. http://dx.doi.org/10.1016/j.phpro.2014.08.092.

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17

Sun, Lin. « Polymeric waveguide prism-based electro-optic beam deflector ». Optical Engineering 40, no 7 (1 juillet 2001) : 1217. http://dx.doi.org/10.1117/1.1385164.

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18

Chiorean, Radu-Stefan. « Electro-Thermo-Mechanical Modeling of V-beam Actuators ». Procedia Technology 19 (2015) : 56–61. http://dx.doi.org/10.1016/j.protcy.2015.02.009.

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19

Kawasuso, A., et M. Maekawa. « Spin-polarization of an electro-static positron beam ». Applied Surface Science 255, no 1 (octobre 2008) : 108–10. http://dx.doi.org/10.1016/j.apsusc.2008.05.181.

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20

Miglioretti, F., E. Carrera et M. Petrolo. « Variable kinematic beam elements for electro-mechanical analysis ». Smart Structures and Systems 13, no 4 (25 avril 2014) : 517–46. http://dx.doi.org/10.12989/sss.2014.13.4.517.

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21

Wang, D. W., H. S. Tzou et H. J. Lee. « Control of Nonlinear Electro/Elastic Beam and Plate Systems (Finite Element Formulation and Analysis) ». Journal of Vibration and Acoustics 126, no 1 (1 janvier 2004) : 63–70. http://dx.doi.org/10.1115/1.1640357.

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Adaptive structures involving large imposed deformation often go beyond the boundary of linear theory and they should be treated as “nonlinear” structures. A generic nonlinear finite element formulation for vibration sensing and control analysis of laminated electro/elastic nonlinear shell structures is derived based on the virtual work principle. A generic curved triangular piezoelectric shell element is proposed based on the layerwise constant shear angle theory. The dynamic system equations, equations of electric potential output and feedback control force defined in a matrix form are derived. The modified Newton-Raphson method is adopted for nonlinear dynamic analysis of large and complex piezoelectric/elastic/control structures. A finite element code for vibration sensing and control analysis of nonlinear active piezoelectric structronic systems is developed. The developed piezoelectric shell element and finite element code are validated and then applied to control analysis of flexible electro-elastic (piezoelectric/elastic) structural systems. Vibration control of constant-curvature electro/elastic beam and plate systems are studied. Time-history responses of free and controlled nonlinear electro/elastic beam and plate systems are presented and nonlinear effects discussed.
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22

Bamdad, M., M. Mohammadimehr et K. Alambeigi. « Analysis of sandwich Timoshenko porous beam with temperature-dependent material properties : Magneto-electro-elastic vibration and buckling solution ». Journal of Vibration and Control 25, no 23-24 (2 juillet 2019) : 2875–93. http://dx.doi.org/10.1177/1077546319860314.

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Vibration and buckling analysis of a magneto-electro-elastic sandwich Timoshenko beam with a porous core and poly-vinylidene fluoride (PVDF) matrix reinforced by carbon nanotubes (CNTs) is considered as face layers and material properties of CNTs and PVDF are assumed to be temperature-dependent. Different CNT distribution patterns including uniform distribution, AV (which top and bottom face sheets have functionally graded-A (FG-A) and functionally graded-V (FG-V) CNT distribution patterns, respectively) and VA patterns are employed. The governing equations of motion are derived based on Timoshenko beam theory, and Navier's solution is used to solve these equations. The sandwich beam resting on a Pasternak foundation and face layers are subjected to electric and magnetic potentials. The effect of different parameters such as porosity coefficient, electric and magnetic potential, parameters of foundation, and geometrical parameters are investigated on vibration and buckling behavior of the sandwich beam. Numerical results of this paper show that porosity distribution has a significant effect on the stiffness of the sandwich beam. The results can be used for future analysis of magneto-electro-mechanical sandwich systems as actuators and sensors.
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23

Semenov, Vladimir, Sergey Makov, Yurij Hanzhonkov et Yurij Astsaturov. « Electro-optical dust sensors calibration by aerosol image analysis ». E3S Web of Conferences 104 (2019) : 02007. http://dx.doi.org/10.1051/e3sconf/201910402007.

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The paper describes the process of data obtaining for designing electro-optical sensors using a television aerosol particles image analyzer. Using simulation based on Mie theory, the process of calibration of simple electro-optical aerosol (dust) sensor is carried out. In the paper the main dependences for sensor calibration are shown. The proper calibration allows power saving by selection certain laser beam power level.
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24

Sun, Chun Geng, Jing Luo, Sen Liu et Peng Zhang. « Electro-Hydraulic Proportional Speed Control on Walking-Beam Conveyer ». Applied Mechanics and Materials 44-47 (décembre 2010) : 3502–7. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.3502.

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Experimental analysis has been done for vibration and noise found in Walking-beam conveyer. Two possible solutions design have been proposed, which integrate with physical components on the speed control system. Because of the determine frequency of the valve, the only way to reducing the opening rate of the valve is using complex signal, which is not what I expect. My research is finding out how to use a simple signal to do complex speed control on Walking-beam conveyer. Through anglicizing the simulation of above design, select the appropriate system for speed control of the Walking-beam conveyer, which provides a theoretical basis and engineering practice for the electro-hydraulic proportional speed control and equipment in the application of non-ferrous metallurgy equipment.
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25

Hu, Yaowen, Mengjie Yu, Di Zhu, Neil Sinclair, Amirhassan Shams-Ansari, Linbo Shao, Jeffrey Holzgrafe, Eric Puma, Mian Zhang et Marko Lončar. « On-chip electro-optic frequency shifters and beam splitters ». Nature 599, no 7886 (24 novembre 2021) : 587–93. http://dx.doi.org/10.1038/s41586-021-03999-x.

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26

Krishnamurthi, Mahesh, Peng Li, Aseem Singh, J. G. Thomas, T. M. Lehecka, Z. Liu et V. Gopalan. « Electro-optic laser beam shaping by patterned ferroelectric domains ». Applied Physics Letters 95, no 20 (16 novembre 2009) : 202902. http://dx.doi.org/10.1063/1.3262349.

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27

Toyoda, S., J. Miyazu, Y. Sasaki, T. Imai et J. Kobayashi. « Polarisation‐independent beam scanner using electro‐optic KTN crystals ». Electronics Letters 50, no 6 (mars 2014) : 456–57. http://dx.doi.org/10.1049/el.2013.3920.

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28

Gu, Xiaodong, Toshikazu Shimada, Ayumi Fuchida, Akihiro Matsutani, Akihiro Imamura et Fumio Koyama. « Electro-Thermal Beam Steering Using Bragg Reflector Waveguide Amplifier ». Japanese Journal of Applied Physics 51, no 2R (1 février 2012) : 020206. http://dx.doi.org/10.7567/jjap.51.020206.

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29

Liu, Cheng-Yang. « Tunable electro-optical 2 × 2 photonic crystal beam splitter ». Journal of Modern Optics 59, no 8 (10 mai 2012) : 734–39. http://dx.doi.org/10.1080/09500340.2012.661476.

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30

Gu, Xiaodong, Toshikazu Shimada, Ayumi Fuchida, Akihiro Matsutani, Akihiro Imamura et Fumio Koyama. « Electro-Thermal Beam Steering Using Bragg Reflector Waveguide Amplifier ». Japanese Journal of Applied Physics 51 (2 février 2012) : 020206. http://dx.doi.org/10.1143/jjap.51.020206.

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31

Bloisi, F., et L. Vicari. « Laser beam manipulation by composite material electro-optic devices ». Optics and Lasers in Engineering 39, no 3 (mars 2003) : 389–408. http://dx.doi.org/10.1016/s0143-8166(01)00112-9.

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32

Xi, Xiao Yan, Zhian Yang et Gao Feng Li. « 1/3 Subharmonic Resonance of the Electro-Conductive Beam in Thermal-Magneto-Elasticity Field ». Advanced Materials Research 466-467 (février 2012) : 814–18. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.814.

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Based on the electro-magneto-elastic theory and the theory of the bending vibration of the electric beam, nonlinear vibration equation of current-carrying beam in thermal-magneto-elasticity field is studied. The Lorentz force and thermal force on the beam are derived. According to the method of multiple scales for nonlinear vibrations the approximation solution of 1/3 subharmonic resonance of the system is obtained. Numerical analysis results show that the amplitude changed with the system parameters.
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33

Nguyen, Thanh-Phuong. « Characterization of High-power DFB-MOPA Diode Lasers Emitting at 1064 nm ». Communications in Physics 29, no 1 (5 février 2019) : 47. http://dx.doi.org/10.15625/0868-3166/29/1/13221.

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Detail characterization of the such laser diode is important for the applications. Electro-Optical and spectral characteristics of the high power 1064 nm DFB-MOPA lasers are investigated at room temperature as function of injection current. Beam quality is characterized by waist diameter and far-field divergence angle versus average optical output power. Beam propagation ratio M2 is defined at difference intensity levels from lateral beam profile giving more detail laser behaviors at high power.
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34

Corigliano, Alberto, Martino Dossi et Stefano Mariani. « Recent Advances in Computational Methods for Microsystems ». Advanced Materials Research 745 (août 2013) : 13–25. http://dx.doi.org/10.4028/www.scientific.net/amr.745.13.

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An algorithm, which combines the use of Domain Decomposition and Model Order Reduction methods based on Proper Orthogonal Decomposition, is proposed. The algorithm allows for the efficient handling of electro-mechanical coupled problems in MEMS, with a strong reduction of computing time with respect to standard monolithic or staggered solution strategies. Examples of coupled electro-mechanical problems, concerning a vibrating beam subject to variable electrostatic forces, are presented and discussed.
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35

Hong, Jun, Shaopeng Wang, Xinyuan Qiu et Gongye Zhang. « Bending and Wave Propagation Analysis of Magneto-Electro-Elastic Functionally Graded Porous Microbeams ». Crystals 12, no 5 (19 mai 2022) : 732. http://dx.doi.org/10.3390/cryst12050732.

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In this paper, a microstructure-dependent magneto-electro-elastic functionally graded porous (MEEFGP) beam model is proposed using a variational approach. To account for the microstructure effect, the extended modified couple stress theory is incorporated in the new model. In addition, the porosity variation of the two-phase beam model through the thickness direction is also considered. The new developed model is verified in terms of its correctness with a FEM model. Based on the equations of motion and boundary conditions derived by Hamilton’s principle, the static bending and wave propagation behaviors of the new model are analytically determined. The results prove the existence of the microstructure effect and the magneto-electro-elastic multi-field coupling effect. There are significant differences between the new model and the classical model at the microscale. Moreover, the porosity also has an important influence on the mechanical properties of the new model. The results predicted by the new model can provide the theoretical basis for the design of microscale acoustic wave devices and micro-electro-mechanical systems.
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36

Wang, Wan Jun, Heng Zhao, Wei Feng Guo, Hai Feng Shao, Ting Hu, Hui Ye Qiu, Jie Zhou et al. « Compact 2X2 Optical Switch Using Silicon Photonics Technology for Optical Beam Forming Network ». Applied Mechanics and Materials 614 (septembre 2014) : 233–36. http://dx.doi.org/10.4028/www.scientific.net/amm.614.233.

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We report the experimental demonstration of a 2×2 electro-optical switch in silicon-on-insulator. By controlling electro-optical phase shifter, light from any input waveguide can be directed to any output waveguide. Furthermore, the proposed optical switch can be expanded to be 1×N and N×N optical switch for optical beam forming network. The switch is fabricated by CMOS technology. In experiment, full 2×2 switching functionality is demonstrated at wavelength of 1.55 μm, with an average crosstalk of-14.6 dB and compact size of 300X100 um2.
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37

Radek, Norbert, Jacek Pietraszek, Aneta Gądek-Moszczak, Łukasz J. Orman et Agnieszka Szczotok. « The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining ». Materials 13, no 10 (19 mai 2020) : 2331. http://dx.doi.org/10.3390/ma13102331.

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Electro-spark deposition (ESD) and laser beam machining (LBM) are the technologies using the concentrated energy flux. This paper deals with the issue of the impact of laser modification on the morphology and mechanical properties of carbide/copper coatings produced by electro-spark treatment. The coatings were applied to C45 carbon steel samples using the EIL-8A device. The following three types of electrodes made using the powder metallurgy (PM) hot pressing technique, from copper and tungsten carbide powders of different percentage compositions, were used for the coatings: 25% WC and 75% Cu; 50% WC and 50% Cu; and 75% WC and 25% Cu. Laser modification of the surface layers was performed with an Nd:YAG laser. The research focused on the analysis of the morphology of coatings applied by electro-spark technology before and after laser processing. The analysis of the morphology of electro-spark coatings revealed that the coatings had microcracks and pores. The laser beam machining of ESD coatings led to the homogenization of chemical composition, fragmentation of the structure, and elimination of microcracks. In addition, measurements of porosity, microhardness, adhesion, and analysis of XRD phase composition of the electro-spark coatings were performed. Laser processing proved to have a positive effect on improving the adhesion of coatings and reducing their porosity. This paper also presents a simulation model of heat transfer processes for the case of laser radiation impact on a WC-Cu coating. The developed numerical model, describing the influence of laser treatment on the distribution of temperature fields in the heated material (at a given depth) is of significant importance in the development of treatment technologies. Laser-modified ESD coatings perform anti-wear and protective functions, which enable their potential application in means of transport such as rolling stock.
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38

Ebrahimi, Farzad, et Mohammad Reza Barati. « Electro-magnetic effects on nonlocal dynamic behavior of embedded piezoelectric nanoscale beams ». Journal of Intelligent Material Systems and Structures 28, no 15 (9 janvier 2017) : 2007–22. http://dx.doi.org/10.1177/1045389x16682850.

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This article investigates vibration behavior of magneto-electro-elastic functionally graded nanobeams embedded in two-parameter elastic foundation using a third-order parabolic shear deformation beam theory. Material properties of magneto-electro-elastic functionally graded nanobeam are supposed to be variable throughout the thickness based on power-law model. Based on Eringen’s nonlocal elasticity theory which captures the small size effects and using Hamilton’s principle, the nonlocal governing equations of motions are derived and then solved analytically. Then, the influences of elastic foundation, magnetic potential, external electric voltage, nonlocal parameter, power-law index, and slenderness ratio on the frequencies of the embedded magneto-electro-elastic functionally graded nanobeams are studied.
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39

Yang, Jin Hua, et Wen Liang Fan. « Nonlinear Dynamic Response of Piezoelectric Beam Reinforced with BNNTs under Electro-Thermo-Mechanical Loadings ». Advanced Materials Research 1065-1069 (décembre 2014) : 1083–86. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1083.

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This paper presents an investigation on the nonlinear dynamic response of piezoelectric beam reinforced with boron nitride nanotubes (BNNTs) under combined electro-thermo-mechanical loadings. By employing nonlinear strain and utilizing piezoelectric theory, the constitutive relations of the piezoelectric beam reinforced with BNNTs are established. Then the dynamic governing equations of the structure are derived through variational principle and resolved by applying the finite difference method. In numerical examples, the effects of geometric nonlinear, voltage etc. on the nonlinear dynamic response of piezoelectric beam reinforced with BNNTs are discussed.
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40

Bagheri, Amin, Fakhroddin Nazari et Mohammad Kazem Moravvej-Farshi. « Bidirectional switchable beam splitter/filter based graphene loaded Si ring resonators ». Physica Scripta 96, no 12 (1 décembre 2021) : 125536. http://dx.doi.org/10.1088/1402-4896/ac42a8.

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Abstract Using bus waveguides coupled to the graphene-loaded Si-ring resonators (GSRRs) all on a Si-on-insulator substrate, we propose a compact bidirectional switchable beam splitter/filter controlled by graphene-based electro-absorptive (refractive) mode modulation. The design is suitable for dense wavelength division multiplexing (DWDM), according to International Telecommunication Union (ITU) standard. The proposed device consists of a through waveguide coupled to two drop waveguides via two GSRRs. Each GSRR consists of a stack of hBN/graphene/hBN nanolayers sandwiched between two Si-ring resonators. Using a finite difference time domain method, we have tuned the resonant wavelengths of GSRRs in the range of 1551.5 < λ < 1552.1 nm, linearly with the slope of ∼ 2.46 nm eV−1 via appropriately changing the graphene chemical potential, electrostatically. The numerical results show that when both GSRRs are in an electro-refractive state and a transverse electric (TE) polarized light beam of an appropriate wavelength is launched into one of the though-ports, ∼ 84.5% of the input intensity equally splits between the adjacent drop-ports. The transmission out of the second through-port is less than 0.8%. The numerical results further show that when one GSRR is in an electro-refractive mode, and the other one is in an electro-absorptive state, ∼ 68.4% of the input intensity transmits out of the drop-port adjacent to the former GSRR, and the other ports experience insignificant outputs (<0.7%). The device’s structural symmetry makes it a bidirectional tunable, suitable for long-haul optical telecommunication applications. Finally, we investigated the fabrication tolerances in the designed parameters.
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Liu, Hu, et Zheng Lv. « Vibration performance evaluation of smart magneto-electro-elastic nanobeam with consideration of nanomaterial uncertainties ». Journal of Intelligent Material Systems and Structures 30, no 18-19 (4 septembre 2019) : 2932–52. http://dx.doi.org/10.1177/1045389x19873418.

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This study is devoted to examining the vibration behaviors of magneto-electro-elastic nanobeams with consideration of nanomaterial uncertainties induced by the atom defect and manufacturing deviation. Based on the nonlocal Timoshenko beam theory, the governing equations of a magneto-electro-elastic nanobeam resting on a Winkler–Pasternak foundation and subjected to electric and magnetic potentials are derived. The material properties of the magneto-electro-elastic nanobeam are treated as uncertain parameters with well-defined bounds to overcome the extensive information required in probabilistic evaluation. The range of natural frequency of the magneto-electro-elastic nanobeam is predicted via a non-probabilistic evaluation methodology, which is validated by comparing with Monte Carlo simulation and probabilistic evaluation methodology. Then, the parametric analyses are performed to reveal the coupling effects of nanomaterial uncertainties, and nonlocal parameter, as well as elastic foundation parameters on the vibration performance of magneto-electro-elastic nanobeams. It is demonstrated that the nanomaterial uncertainties affect the mechanical behaviors of magneto-electro-elastic nanostructures significantly and the present model can be degenerated into the deterministic model as the nanomaterial uncertainty is eliminated.
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42

Radek, Norbert, Jacek Pietraszek et Janusz Konstanty. « Operational Properties of the Cermet Electro-Spark Coatings after Laser Treatment – Technology and Application ». System Safety : Human - Technical Facility - Environment 1, no 1 (1 mars 2019) : 797–804. http://dx.doi.org/10.2478/czoto-2019-0102.

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AbstractThe paper is concerned with determining the influence of the laser treatment process on the properties of electro-spark coatings. The properties of the coatings after laser treatment were assessed based on following methods: microstructure and X-ray diffraction analysis, adhesion tests, roughness measurement, hardness tests, tribological properties and application tests. The tests were carried out on WC-Co coating (the anode) obtained by electro-spark deposition over carbon steel C45 (the cathode) and molten with a laser beam. The coatings were deposited by means of the EIL-8A and they were laser treated with the Nd:YAG. The tests show that the laser-treated electro-spark deposited WC-Co coatings are characterized by lower hardness, higher seizure resistance, roughness and adhesion. The laser treatment process causes the homogenization of the chemical composition, the structure refinement and the healing of microcracks and pores of the electro-spark deposited coatings. Laser treated electro-spark deposited coatings are likely to be applied in sliding friction pairs and as protective coatings.
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Hattori, Shinobu, Toshio Fukuda et Shigenobu Nagamori. « A Study on Optical Piezo-Electric Actuator (Response Experiments by U.V. Beam and Photo Response Model) ». Journal of Robotics and Mechatronics 4, no 4 (20 août 1992) : 321–29. http://dx.doi.org/10.20965/jrm.1992.p0321.

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In this paper, we propose a photo response model of the optical piezo-electro actuator, which reacts by light beam. Based on response experiments by U.V. beam, the response in this model is constituted with three effects: 1) photostrictive effect; 2) pyroelectro effect; 3) thermal deformation. Those effects are different in response magnitude and response time each other; influenced by the characteristics of the light beam. In consequence, it is possible that a photo response is controlled by changing characteristics of light beam. As a whole, results of the simulations of this model agree with those of the experiments.
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Abdollahzadeh Jamalabadi, M. Y., et Moon K. Kwak. « Dynamic modeling of a galloping structure equipped with piezoelectric wafers and energy harvesting ». Noise Control Engineering Journal 67, no 3 (1 mai 2019) : 142–54. http://dx.doi.org/10.3397/1/376713.

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This study presents the analytical solution and experimental investigation of the galloping energy harvesting from oscillating elastic cantilever beam with a rigid mass. A piezoelectric wafer was attached to galloping cantilever beam to harvest vibrational energy in electric charge form. Based on Euler-Bernoulli beam assumption and piezoelectric constitutive equation, kinetic energy and potential energy of system were obtained for the proposed structure. Virtual work by generated charge and galloping force applied onto the rigid mass was obtained based on Kirchhoff's law and quasistatic assumption. Nonlinear governing electro-mechanical equations were then obtained using Hamilton's principle. As the system vibrates by self-exciting force, the fundamental mode is the only one excited by galloping. Hence, multi-degreeof-freedom equation of motion is simplified to one-degree-of-freedom model. In this study, closed-form solutions for electro-mechanical equations were obtained by using multi-scale method. Using these solutions, we can predict galloping amplitude, voltage amplitude and harvested power level. Numerical and experimental results are presented and discrepancies between experimental and numerical results are fully discussed.
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Toth, M., K. Fleischer et M. R. Phillips. « Electron Beam Induced Impurity Electro-Migration in Unintentionally Doped GaN ». MRS Internet Journal of Nitride Semiconductor Research 4, S1 (1999) : 257–62. http://dx.doi.org/10.1557/s1092578300002556.

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Electron beam induced electromigration of ON+and H+impurities in unintentionally n-doped GaN was investigated using cathodoluminescence (CL) kinetics profiling, CL imaging of regions pre-irradiated with a stationary electron beam, and wavelength dispersive x-ray spectrometry (WDS). The presented results (i) illustrate induced impurity diffusion in wide bandgap semiconductors, (ii) provide experimental evidence for the (VGa−ON)2−model of yellow luminescence in GaN with low Si content1, (iii) confirm the roles of O in frequently reported bound exciton and donor-acceptor pair emissions and (iv) suggest the involvement of ON+and hydrogenated gallium vacancies in a blue emission in autodoped GaN.
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Hunt-Stone, Keenan, Robert Ariniello, Christopher Doss, Valentina Lee et Mike Litos. « Electro-optic sampling beam position monitor for relativistic electron beams ». Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment 999 (mai 2021) : 165210. http://dx.doi.org/10.1016/j.nima.2021.165210.

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MORIMOTO, Akihiro, et Taisuke WADA. « Laser Beam Control by Electro-Optic Devices Using Polarization Reversal ». Review of Laser Engineering 32, no 3 (2004) : 165–69. http://dx.doi.org/10.2184/lsj.32.165.

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Lepore, John A., et Daniel D. Stancil. « Electro‐optic beam deflectors for magneto‐optic recording heads (abstract) ». Journal of Applied Physics 73, no 10 (15 mai 1993) : 6844. http://dx.doi.org/10.1063/1.352455.

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Graettinger, T. M., S. H. Rou, M. S. Ameen, O. Auciello et A. I. Kingon. « Electro‐optic characterization of ion beam sputter‐deposited KNbO3thin films ». Applied Physics Letters 58, no 18 (6 mai 1991) : 1964–66. http://dx.doi.org/10.1063/1.105033.

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Kim, Jungyun, Hocheol Lee et Heung Soo Kim. « Beam vibration control using cellulose-based Electro-Active Paper sensor ». International Journal of Precision Engineering and Manufacturing 11, no 6 (décembre 2010) : 823–27. http://dx.doi.org/10.1007/s12541-010-0099-8.

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