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Artículos de revistas sobre el tema "Coupled excitation"

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Autor: Grafiati

Publicado: 6 de septiembre de 2023

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1

Xu, Lizhong y Fen Wang. "Nonlinear Forced Response of Electromechanical Integrated Toroidal Drive to Coupled Excitation". Scientific World Journal 2012 (2012): 1–10. http://dx.doi.org/10.1100/2012/743138.

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The electric excitation and the parameter excitation from mesh stiffness fluctuation are analyzed. The forced response equations of the drive system to the coupled excitations are presented. For the exciting frequencies far from and near natural frequencies, the forced responses of the drive system to the coupled excitations are investigated. Results show that the nonlinear forced responses of the drive system to the coupled excitations change periodically and unsteadily; the time period of the nonlinear forced responses depends on the frequencies of the electric excitation, the mesh parameter excitation, and the nonlinear natural frequencies of the drive system; in order to improve the dynamics performance of the drive system, the frequencies of the electric excitations should not be taken as integral multiple of the mesh parameter exciting frequency.

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2

LiZhong, Xu y Fu XiaoRui. "Electromechanical Coupled Forced Responses for Microplate". Advances in Mechanical Engineering 6 (1 de enero de 2014): 857015. http://dx.doi.org/10.1155/2014/857015.

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The electromechanical coupled forced response of the microplate subjected to electrostatic force is investigated. Using electromechanical coupled dynamic equations and the mode superposition method, the forced responses of the microplate to voltage excitation and load excitation are analyzed, respectively. Based on this, the coupled forced responses of the micrplate to voltage and load excitations are obtained. Beat vibration caused by the coupled response is investigated and the condition that the beat vibration occurs is determined.

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3

Qian, Y. H. y D. M. Yan. "Fast–Slow Dynamics Analysis of a Coupled Duffing System with Periodic Excitation". International Journal of Bifurcation and Chaos 28, n.º 12 (noviembre de 2018): 1850148. http://dx.doi.org/10.1142/s0218127418501481.

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In this paper, a two-degree-of-freedom nonlinear coupled Duffing equation with an external excitation and two external excitations are studied. For the coupled Duffing system with periodic excitation, the system shows the dynamic behavior on different time scales when the excitation frequency and the inherent frequency of the system are different. Firstly, we discretize the system by using the Euler method, and the discrete equation is obtained. Secondly, the two external excitations are considered as slow variables that are transformed into a slow variable by the Moivre formula, which divides the original system into the fast–slow subsystem. Finally, the oscillation dynamic behavior of the coupled system is discussed by combining fast–slow analysis method and the transformation phase diagram.

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4

Ren, Fushen, Baojin Wang y Suli Chen. "Nonlinear Modeling and Qualitative Analysis of Coupled Vibrations in a Drill String". International Journal of Bifurcation and Chaos 28, n.º 10 (septiembre de 2018): 1850119. http://dx.doi.org/10.1142/s0218127418501195.

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A coupled model for axial/torsional/lateral vibrations of the drill string is presented, in which the nonlinear dynamics and qualitative analysis method are employed to find out the key factors and sensitive zone for coupled vibration. The drill string is simplified as an equivalent shell under axial rotation. After dimensionless processing, the mathematical model for coupled axial/torsional/lateral vibrations of the drill string is obtained. The Runge–Kutta–Fehlberg method is employed for the numerical simulation, and the rules that govern the changing of the torsional and axial excitation are revealed. And the stability domains of the explicit Runge–Kutta method are analyzed. Furthermore, the suggestions for field applications are also presented. It is demonstrated by simulation results that the lateral/axial/torsional vibrations exist simultaneously and couple with each other. The system will obtain a stable period motion with an axial excitation zone before the coupled vibration in the three directions, and continue to increase the axial excitation to cause the coupled vibration easily. The torsional excitation of the drill string mainly contributes to the coupled vibration in the three directions when in a specific rotation speed zone. The system is more likely to obtain a periodic motion through adjusting the torsional excitation out of this zone.

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5

LEI, YOUMING y FULI GUAN. "DISORDER INDUCED ORDER IN AN ARRAY OF CHAOTIC DUFFING OSCILLATORS". International Journal of Modern Physics C 23, n.º 10 (octubre de 2012): 1250071. http://dx.doi.org/10.1142/s0129183112500714.

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This paper addresses the issue of disorder induced order in an array of coupled chaotic Duffing oscillators which are excited by harmonic parametric excitations. In order to investigate the effect of phase disorder on dynamics of the array, we take into account that individual uncoupled Duffing oscillator with a parametric excitation is chaotic no matter what the initial phase of the excitation is. It is shown that phase disorder by randomly choosing the initial phases of excitations can suppress spatio-temporal chaos in the system coupled by chaotic Duffing oscillators. When all the phases are the same and deterministic, the oscillators remain chaotic and asynchronous no matter what the common phase is. When driven asynchronously by introducing phase disorder, the oscillators coupled in the array appear more regular with increase of the amplitude of random phase, and the highest level of synchrony between them is induced by intermediate phase disorder, displaying a resonance like phenomenon caused from the transition of the coupled oscillators from chaos to periodic motion. Since varying the initial phases of excitations is more feasible than altering parameters intrinsic to the oscillators coupled in an array, this study provides a practical method for control and synchronization of chaotic dynamics in high-dimensional, spatially extended systems, which might have potential applications in engineering, neuroscience and biology.

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6

WENG, GUO-EN, BAO-PING ZHANG, MING-MING LIANG, XUE-QIN LV, JIANG-YONG ZHANG, LEI-YING YING, ZHI REN QIU et al. "OPTICAL PROPERTIES AND CARRIER DYNAMICS IN ASYMMETRIC COUPLED InGaN MULTIPLE QUANTUM WELLS". Functional Materials Letters 06, n.º 02 (abril de 2013): 1350021. http://dx.doi.org/10.1142/s1793604713500215.

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Optical properties and carrier dynamics of InGaN/GaN asymmetric coupled quantum wells (ACQWs) are studied by excitation-power-dependent photoluminescence (PL), photoreflectance (PR) and time-resolved PL (TRPL) experiments. Under weak excitations, only the emission from the widest well is observed due to the tunneling from narrower to wider wells. Under strong excitations, the carrier distribution becomes more uniform and an enhanced emission from the mid well (2.5 nm well) is observed. Dependence of the PL intensity on excitation power is well explained by a rate equation model. The energy levels in the ACQW structure are clearly revealed by PR measurements and are in good agreement with calculations. Our results indicate that the enhanced emission from the mid well is ascribed to "reverse tunneling" from 3.0 to 2.5 nm well, which is confirmed by TRPL experiments.

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7

Li, Shouying, Yuanyuan Wang, Qingyu Zeng y Zhengqing Chen. "Coupled responses of stay cables under the combined rain–wind and support excitations by theoretical analyses". Advances in Structural Engineering 23, n.º 11 (10 de marzo de 2020): 2261–75. http://dx.doi.org/10.1177/1369433220911164.

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Stay cables on several cable-stayed bridges all over the world have been found to experience rain-wind-induced vibrations under the combined action of rain and wind. Meanwhile, the bridge deck might also have obvious oscillation under the wind and/or traffic loads. The coupled responses of a stay cable under the combined rain–wind and support excitations are numerically investigated in this article. The equations of motion of a three-dimensional continuous stay cable are derived by considering the high-order nonlinear components of the dynamic cable tension, together with the equation of motion of the rivulet on the cable surface. The forces induced by rain–wind excitation are determined by the quasi-steady theory, and the support excitation is achieved by the boundary condition. The coupled equations of the cable and the rivulet are numerically solved by using the finite difference method and the fourth-order Runge–Kutta method, respectively. The numerical results show that the high-order nonlinear components of the dynamic cable tension should be taken into account to numerically reproduce the parametric vibration of the stay cable, whereas they hardly have any effects on the rain-wind-induced vibration and the resonance vibration of the stay cable. The responses of stay cable under vertical support oscillation only and the rain–wind excitation only obtained from this study agree well with the literature results. Compared with the results induced by single-source excitation, the cable response amplitude under the combined excitations is smaller than that induced only by support excitation and larger than that induced only by rain–wind excitation. The rivulet is prone to be thrown from the cable surface if the parametric vibration of the stay cable is evoked.

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8

Kitamura, H., M. S. Murillo y J. C. Weisheit. "Atomic excitation in strongly coupled plasmas". Le Journal de Physique IV 10, PR5 (marzo de 2000): Pr5–493—Pr5–496. http://dx.doi.org/10.1051/jp4:2000595.

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9

Walls, Jamie D., Malgorzata Marjanska, Dimitris Sakellariou, Franca Castiglione y Alexander Pines. "Selective excitation in dipole coupled systems". Chemical Physics Letters 357, n.º 3-4 (mayo de 2002): 241–48. http://dx.doi.org/10.1016/s0009-2614(02)00493-1.

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10

Despoja, V., L. Marušić y M. Šunjić. "Excitation spectra of coupled metallic slabs". Solid State Communications 140, n.º 6 (noviembre de 2006): 270–75. http://dx.doi.org/10.1016/j.ssc.2006.08.036.

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11

Ibrahim, R. A., Y. J. Yoon y Michael G. Evans. "Random excitation of nonlinear coupled oscillators". Nonlinear Dynamics 1, n.º 1 (enero de 1990): 91–116. http://dx.doi.org/10.1007/bf01857587.

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12

Pulsifer, Drew Patrick, Muhammad Faryad y Akhlesh Lakhtakia. "Grating-coupled excitation of Tamm waves". Journal of the Optical Society of America B 29, n.º 9 (2 de agosto de 2012): 2260. http://dx.doi.org/10.1364/josab.29.002260.

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13

Harris, Frank E. "Coupled-cluster method for excitation energies". International Journal of Quantum Chemistry 12, S11 (18 de junio de 2009): 403–11. http://dx.doi.org/10.1002/qua.560120848.

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14

Luo, Jianhui y Hae Chang Gea. "Optimal Stiffener Design for Interior Sound Reduction Using a Topology Optimization Based Approach". Journal of Vibration and Acoustics 125, n.º 3 (18 de junio de 2003): 267–73. http://dx.doi.org/10.1115/1.1569512.

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A topology optimization based approach is proposed to study the optimal configuration of stiffeners for the interior sound reduction. Since our design target is aimed at reducing the low frequency noise, a coupled acoustic-structural conservative system without damping effect is considered. Modal analysis method is used to evaluate the interior sound level for this coupled system. To formulate the topology optimization problem, a recently introduced Microstructure-based Design Domain Method (MDDM) is employed. Using the MDDM, the optimal stiffener configurations problem is treated as a material distribution problem and sensitivity analysis of the coupled system is derived analytically. The norm of acoustic excitation is used as the indicator of the interior sound level. The optimal stiffener design is obtained by solving this topology optimization problem using a sequential convex approximation method. Examples of acoustic box under single frequency excitation and a band of low frequency excitations are presented and discussed.

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15

Hab-arrih, Radouan, Ahmed Jellal, Dionisis Stefanatos y Abdeldjalil Merdaci. "Instability of Meissner Differential Equation and Its Relation with Photon Excitations and Entanglement in a System of Coupled Quantum Oscillators". Quantum Reports 3, n.º 4 (17 de octubre de 2021): 684–702. http://dx.doi.org/10.3390/quantum3040043.

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In this work, we investigate the Schrödinger dynamics of photon excitation numbers and entanglement in a system composed by two non-resonant time-dependent coupled oscillators. By considering π periodically pumped parameters (oscillator frequencies and coupling) and using suitable transformations, we show that the quantum dynamics can be determined by two classical Meissner oscillators. We then study analytically the stability of these differential equations and the dynamics of photon excitations and entanglement in the quantum system numerically. Our analysis shows two interesting results, which can be summarized as follows: (i) Classical instability of classical analog of quantum oscillators and photon excitation numbers (expectations Nj) are strongly correlated, and (ii) photon excitations and entanglement are connected to each other. These results can be used to shed light on the link between quantum systems and their classical counterparts and provide a nice complement to the existing works studying the dynamics of coupled quantum oscillators.

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16

Shen, Lituo, Rongxin Chen, Huaizhi Wu, Zhenbiao Yang, E. K. Irish y Shibiao Zheng. "Quantum Phase Transition of Polaritonic Excitations in a Multi-Excitation Coupled Array". International Journal of Theoretical Physics 56, n.º 11 (23 de septiembre de 2017): 3667–89. http://dx.doi.org/10.1007/s10773-017-3532-2.

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17

Hald, Kasper, Christof Hättig, Jeppe Olsen y Poul Jørgensen. "CC3 triplet excitation energies using an explicit spin coupled excitation space". Journal of Chemical Physics 115, n.º 8 (22 de agosto de 2001): 3545–52. http://dx.doi.org/10.1063/1.1388042.

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18

Gao, Mingyang y Wenguang Liu. "Study on a Base-galloping Hybrid Excitation Piezoelectric Vibration Energy Harvester". Journal of Physics: Conference Series 2383, n.º 1 (1 de diciembre de 2022): 012003. http://dx.doi.org/10.1088/1742-6596/2383/1/012003.

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Vibration response and performance of a piezoelectric energy harvester under the hybrid excitation of base vibration and galloping is studied. Based on the Euler-Bernoulli beam theory, the distributed-parameter model of a piezoelectric cantilever beam with base and galloping hybrid excitation is derived. Subsequently, the electromechanical coupled reduced order model and the decoupling model of the system is obtained. Thereafter, the analytical solution of the vibration response and the coupling relationship between the two hybrid excitations are analyzed. In the end, the impacts of the load resistance, the excitation acceleration and the wind speed on the power generation performance of the system are examined. Results indicated that the hybrid excitation can not only increase the energy harvester power of the system by 2.4W, but also effectively broaden the frequency band compared with the single foundation excitation. The research result is helpful to the dynamic design of a piezoelectric vibration energy harvesters under hybrid vibration excitation.

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19

Yoon, Y. J. y R. A. Ibrahim. "Parametric random excitation of nonlinear coupled oscillators". Nonlinear Dynamics 8, n.º 3 (octubre de 1995): 385–413. http://dx.doi.org/10.1007/bf00045623.

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20

Newman, John W. "Nondestructive testing using air‐coupled acoustic excitation". Journal of the Acoustical Society of America 93, n.º 5 (mayo de 1993): 3015–16. http://dx.doi.org/10.1121/1.405792.

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21

Cetinkaya, C., Liang Ban, G. Subramanian y I. Akseli. "Multimode Air-Coupled Excitation of Micromechanical Structures". IEEE Transactions on Instrumentation and Measurement 57, n.º 11 (noviembre de 2008): 2457–61. http://dx.doi.org/10.1109/tim.2008.924934.

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22

Statz, E. R. y K. A. Nelson. "PHONON-POLARITON EXCITATION IN COUPLED FERROELECTRIC WAVEGUIDES". Integrated Ferroelectrics 92, n.º 1 (6 de diciembre de 2007): 14–17. http://dx.doi.org/10.1080/10584580701743936.

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23

Maab, Husnul, Muhammad Faryad y Akhlesh Lakhtakia. "Prism-coupled excitation of multiple Tamm waves". Journal of Modern Optics 60, n.º 5 (marzo de 2013): 355–58. http://dx.doi.org/10.1080/09500340.2013.776121.

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24

Faryad, Muhammad y Akhlesh Lakhtakia. "Prism-coupled excitation of Dyakonov–Tamm waves". Optics Communications 294 (mayo de 2013): 192–97. http://dx.doi.org/10.1016/j.optcom.2012.12.072.

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25

Gil, M., T. Manzaneque, J. Hernando-García, A. Ababneh, H. Seidel y J. L. Sánchez-Rojas. "Selective modal excitation in coupled piezoelectric microcantilevers". Microsystem Technologies 18, n.º 7-8 (7 de enero de 2012): 917–24. http://dx.doi.org/10.1007/s00542-011-1411-y.

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26

Yong-Qing, Wang, Pu Yong-Ni, Sun Rong-Xia, Tang Yu-Jun, Chen Wen-Jun, Lou Jian-Zhong y Ma Wen. "A Microfabricated Inductively Coupled Plasma Excitation Source". Chinese Physics Letters 25, n.º 1 (enero de 2008): 202–4. http://dx.doi.org/10.1088/0256-307x/25/1/055.

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27

Ittipiboon, A., D. Roscoe, M. Cuhaci y Y. M. M. Antar. "Slot-coupled excitation of microstrip dipole antennas". Electronics Letters 28, n.º 2 (1992): 193. http://dx.doi.org/10.1049/el:19920120.

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28

Pulsifer, Drew Patrick, Muhammad Faryad y Akhlesh Lakhtakia. "Grating-coupled excitation of Tamm waves: erratum". Journal of the Optical Society of America B 30, n.º 1 (17 de diciembre de 2012): 177. http://dx.doi.org/10.1364/josab.30.000177.

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29

Tran, Vien Thi y Heongkyu Ju. "Fluorescence Enhancement via Dual Coupling of Dye Molecules with Silver Nanostructures". Chemosensors 9, n.º 8 (10 de agosto de 2021): 217. http://dx.doi.org/10.3390/chemosensors9080217.

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We demonstrate the enhancement of fluorescence emitted from dye molecules coupled with two surface plasmons, i.e., silver nanoparticles (AgNPs)-induced localized surface plasmons (LSP) and thin silver (Ag) film supported surface plasmons. Excitation light is illuminated to a SiO2 layer that contains both rhodamine 110 molecules and AgNPs. AgNPs enhances excitation rates of dye molecules in their close proximity due to LSP-induced enhancement of local electromagnetic fields at dye excitation wavelengths. Moreover, the SiO2 layer on one surface of which a 50 nm-thick Ag film is coated for metal cladding (air on the other surface), acts as a waveguide core at the dye emission wavelengths. The Ag film induces the surface plasmons which couple with the waveguide modes, resulting in a waveguide-modulated version of surface plasmon coupled emission (SPCE) for different SiO2 thicknesses in a reverse Kretschmann configuration. We find that varying the SiO2 thickness modulates the fluorescent signal of SPCE, its modulation behavior being in agreement with the theoretical simulation of thickness dependent properties of the coupled plasmon waveguide resonance. This enables optimization engineering of the waveguide structure for enhancement of fluorescent signals. The combination of LSP enhanced dye excitation and the waveguide-modulated version of SPCE may offer chances of enhancing fluorescent signals for a highly sensitive fluorescent assay of biomedical and chemical substances.

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30

Christiansen, Ove, Henrik Koch y Poul Jo/rgensen. "Perturbative triple excitation corrections to coupled cluster singles and doubles excitation energies". Journal of Chemical Physics 105, n.º 4 (22 de julio de 1996): 1451–59. http://dx.doi.org/10.1063/1.472007.

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31

Watts, John D. y Rodney J. Bartlett. "Economical triple excitation equation-of-motion coupled-cluster methods for excitation energies". Chemical Physics Letters 233, n.º 1-2 (febrero de 1995): 81–87. http://dx.doi.org/10.1016/0009-2614(94)01434-w.

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32

Bourg, Stéphane y Jean-Marc Nuzillard. "In-Phase Double Selective Excitation of Coupled Spin Systems Using Excitation Sculpting". Journal of Magnetic Resonance 133, n.º 1 (julio de 1998): 173–76. http://dx.doi.org/10.1006/jmre.1998.1453.

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33

Kornovan, D., E. Vlasiuk, A. Poddubny y M. Petrov. "Doubly excited states in a chiral waveguide-QED system: description and properties". Journal of Physics: Conference Series 2015, n.º 1 (1 de noviembre de 2021): 012070. http://dx.doi.org/10.1088/1742-6596/2015/1/012070.

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Abstract In modern quantum optics chiral waveguide quantum-electrodynamical (wQED) systems are attracting a lot of attention from the perspective of fundamental science, and possible interesting applications. In our work we theoretically analyze the eigenstates in a two-excitation domain of an ensemble of two-level atoms that are periodically spaced, and asymmetrically coupled to a guided mode. We found that in a regime when all atoms emit photons in-phase, most eigenstates in such a system can be well-approximated and described through the eigenstates from a single excitation domain, while the rest present a superposition of bound states with two strongly attracting excitations, and states, for which the excitations strongly repel from each other occupying the opposite edges of the system.

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34

Rumyantsev, V. V., S. A. Fedorov, K. V. Gumennyk, A. Ye Rybalka y Yu D. Zavorotnev. "Polaritonic crystal formed of a tunnel-coupled microcavity array and an ensemble of quantum dots". Journal of Physics: Conference Series 2052, n.º 1 (1 de noviembre de 2021): 012036. http://dx.doi.org/10.1088/1742-6596/2052/1/012036.

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Abstract Propagation of polariton excitations in a defect-containing one-dimensional lattice of microcavities with embedded ultracold atomic nanoclusters (quantum dots) is being considered. The virtual crystal approximation is used to study the properties of electromagnetic excitation spectrum resulting from random variations of the atomic subsystem composition and positions of micropores, as well as from a homogeneous elastic deformation of the considered one-dimensional structure. The group velocity dependence of polariton excitations on structural defect concentration and on deformation parameter is being numerically modeled.

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35

Wang, Jia Dian, Chong Liu y Xiao Zeng Xie. "Vibration Analysis of the Control Valve Coupled Models". Advanced Materials Research 955-959 (junio de 2014): 894–98. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.894.

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A marine steam turbine control valve is taken as the research object in this paper, the vibration response is studied under pressure pulse excitation. The transient flow field analysis is made using the method of large eddy simulation to obtain the time-domain information of the pressure pulsation. Then, the analysis of vibration based on coupled modes, research vibration response and resonance problems of the control valve. The study found that the vibration of control valve is strongly in low frequency excitation, but high-frequency excitation makes relatively little impacts on it; The diffuser and downstream of valve is the main area of generating vibration.

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36

Hald, Kasper, Christof Hättig y Poul Jørgensen. "Triplet excitation energies in the coupled cluster singles and doubles model using an explicit triplet spin coupled excitation space". Journal of Chemical Physics 113, n.º 18 (8 de noviembre de 2000): 7765–72. http://dx.doi.org/10.1063/1.1316033.

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37

Yeo, Hyeonsoo, Mark Potsdam y Robert A. Ormiston. "Rotor Aeroelastic Stability Analysis Using Coupled Computational Fluid Dynamics/Computational Structural Dynamics". Journal of the American Helicopter Society 56, n.º 4 (1 de octubre de 2011): 1–16. http://dx.doi.org/10.4050/jahs.56.042003.

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Computational fluid dynamics/computational structural dynamics (CFD/CSD) coupling was successfully applied to the rotor aeroelastic stability problem to calculate lead–lag regressing mode damping of a hingeless rotor in hover and forward flight. A direct time domain numerical integration of the equations in response to suitable excitation was solved using a tight CFD/CSD coupling. Two different excitation methods—swashplate cyclic pitch and blade tip lead–lag force excitations—were investigated to provide suitable blade transient responses. The free decay transient response time histories were postprocessed using the moving-block method to determine the damping as a function of the rotor operating conditions. Coupled CFD/CSD analysis results are compared with the experimentally measured stability data obtained for a 7.5-ft-diameter Mach-scale hingeless rotor model as well as stability predictions using the comprehensive analysis Rotorcraft Comprehensive Analysis System (RCAS). The coupled CFD/CSD predictions agreed more closely with the experimental lead–lag damping measurements than RCAS predictions based on conventional aerodynamic methods, better capturing key features in the damping trends.

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38

Xue, S. D., Z. Cao y X. S. Wang. "Random Vibration Study of Structures under Multi-Component Seismic Excitations". Advances in Structural Engineering 5, n.º 3 (agosto de 2002): 185–92. http://dx.doi.org/10.1260/136943302760228130.

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A random vibration study of structures under multi-component seismic excitations is presented in this paper. The pseudo excitation method proposed by J. H. Lin is employed and is further developed, from which a multi-component pseudo excitation method is formulated. Then, the random model and correlation for multiple ground motions are investigated. Based on the method, a computer program is developed and a random vibration study is performed for a double-layer spherical lattice shell to investigate its seismic performance under multi-component seismic excitations. It is found that a significant difference may occur between single and multi-component seismic excitations. The present study has shown that the developed method is a highly efficient and accurate CQC algorithm, in which all the cross-correlation terms between both participant modes and seismic excitations are involved. This method can easily be used for multi-component seismic analysis of structures that have closely spaced natural frequencies and coupled vibration modes.

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39

Yuan, Suwei, Haichao Zhu, Jiuxiao Hou y Jinlong Liao. "Acoustic characteristics of a cylindrical shell coupled to an acoustic cavity under complex excitations". AIP Advances 12, n.º 11 (1 de noviembre de 2022): 115212. http://dx.doi.org/10.1063/5.0125655.

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In this research, we analyze the acoustic–vibration coupling of liquid-filled cylindrical shells under complex excitations. A calculation model to determine the acoustic characteristics and steady-state response of a cylindrical shell coupled to an acoustic cavity is proposed. The displacement and sound pressure of the cylindrical shell are described by a Chebyshev–Fourier series in three dimensions. The uncertain expansion coefficient is determined with a Rayleigh–Ritz model. The accuracy and convergence of this method are compared with those of the finite element method. The spring constraint is applied to simulate arbitrary boundary parameters. The impact of these parameters on the coupled natural frequency is analyzed. Finally, the steady-state response of a coupled system for various excitation parameters is analyzed.

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40

Wang, Guanghui, Zhoufeng Ying, Ho-pui Ho, Ying Huang, Ningmu Zou y Xuping Zhang. "Nano-optical conveyor belt with waveguide-coupled excitation". Optics Letters 41, n.º 3 (29 de enero de 2016): 528. http://dx.doi.org/10.1364/ol.41.000528.

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41

Cucurachi, S., A. D'Orazio, M. De Sario, V. Petruzzelli y F. Prudenzano. "Mathematical refinements of excitation conditions in coupled waveguides". Journal of Electromagnetic Waves and Applications 9, n.º 1-2 (1 de enero de 1995): 241–65. http://dx.doi.org/10.1163/156939395x00343.

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42

Corzo, Neil V., Jérémy Raskop, Aveek Chandra, Alexandra S. Sheremet, Baptiste Gouraud y Julien Laurat. "Waveguide-coupled single collective excitation of atomic arrays". Nature 566, n.º 7744 (febrero de 2019): 359–62. http://dx.doi.org/10.1038/s41586-019-0902-3.

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43

Bertulani, C. A., L. F. Canto y M. S. Hussein. "A coupled-channels study of 11Be Coulomb excitation". Physics Letters B 353, n.º 4 (julio de 1995): 413–16. http://dx.doi.org/10.1016/0370-2693(95)00595-c.

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44

Simon, Anne-Laure, Fabien Chirot, Chang Min Choi, Christian Clavier, Marc Barbaire, Jacques Maurelli, Xavier Dagany, Luke MacAleese y Philippe Dugourd. "Tandem ion mobility spectrometry coupled to laser excitation". Review of Scientific Instruments 86, n.º 9 (septiembre de 2015): 094101. http://dx.doi.org/10.1063/1.4930604.

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45

Yang, Jing y Jie Liu. "Soliton excitation in coupled complex scalar field theory". Journal of Physics: Condensed Matter 4, n.º 17 (27 de abril de 1992): 4331–34. http://dx.doi.org/10.1088/0953-8984/4/17/013.

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46

Kazys, Rymantas, Almantas Vilpisauskas y Justina Sestoke. "Application of Air-Coupled Ultrasonic Arrays for Excitation of a Slow Antisymmetric Lamb Wave". Sensors 18, n.º 8 (11 de agosto de 2018): 2636. http://dx.doi.org/10.3390/s18082636.

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Air-coupled excitation and reception of ultrasonic guided waves is already used for non-destructive testing and evaluation (NDT & E). Usually for air-coupled NDT & E purposes the lowest zero-order antisymmetric Lamb wave mode A0 is used, because it is most sensitive to internal defects and thickness variations. The velocity of the A0 mode is reduced with a reducing frequency and at low frequencies may become slower than the ultrasound velocity in air. Such a wave is named a slow Lamb wave. The objective of this research was the development and investigation of an air-coupled excitation method of the slow zero-order antisymmetric Lamb wave based on application of a piezoceramic ultrasonic array. We have proposed to excite the A0 mode by a planar air-coupled phased array with rectangular elements. The array is matched to the wavelength of the A0 mode in the film. Performance of such an excitation method was investigated both theoretically and experimentally. Two excitation methods of the array were analysed: when all array elements were excited simultaneously or one by one with a proper delay. In order to reduce crosstalk between array elements via the air gap, we have proposed an optimization procedure based on additional shifts of electric excitation impulses of the array elements. For experimental verification of the proposed approach a prototype of the air-coupled eight element array made of Pz-29 piezoceramic strips was manufactured. Experimental validation confirmed the possibility of exciting the slow A0 Lamb wave mode through the air gap in thin plates and films.

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47

Dai, Y. Y., H. Wang, T. Yang y Z. D. Zhang. "Resonant excitation of coupled skyrmions by spin-transfer torque". International Journal of Modern Physics B 30, n.º 02 (20 de enero de 2016): 1550254. http://dx.doi.org/10.1142/s0217979215502549.

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Resonant excitations of coupled skyrmions in Co/Ru/Co nanodisks activated by spin-transfer torque (STT) have been studied by micromagnetic simulations. It is found that STT is an effective method to manipulate skyrmion dynamics. Unlike the dynamics driven by a microwave field, two skyrmions with opposite chiralities move synchronously in the same direction when they are driven by STT, which makes it easier to observe the dynamics of coupled skyrmions in experiments. Resonant excitations of coupled skyrmions can be controlled by changing the frequency or amplitude ratio of a dual-frequency alternating current (AC). In addition, the magnetostatic interaction between the two skyrmions plays an important role in the dynamics of coupled skyrmions.

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48

Allen, G. Mark y David M. Coleman. "Characterization of a Dual Inductively Coupled Plasma Atomic Emission Source". Applied Spectroscopy 41, n.º 3 (marzo de 1987): 381–87. http://dx.doi.org/10.1366/0003702874449039.

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A dual inductively copuled plasma atomic emission spectroscopic system is described. This new analytical discharge segregates the normally integrated processes of sampling and spectral excitation associated with atomic emission sources. A low-power, low-argon-flow, radio-frequency plasma is used as a sampling device to create gaseous species from liquid and solid samples which are subsequently transported to a second plasma for excitation. Design and construction of instrumentation and associated operational parameters are reviewed. Comparisons of the sampling and the excitation plasmas include spatial emission profiles, linear calibration plots, signal-to-background ratios, and analytical detection limits. Use of the dual ICP for direct analysis of particulates (coal fly ash and firebrick) is demonstrated.

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49

Shi, Xuan-Zheng y Sushil K. Sarna. "G protein-mediated dysfunction of excitation-contraction coupling in ileal inflammation". American Journal of Physiology-Gastrointestinal and Liver Physiology 286, n.º 6 (junio de 2004): G899—G905. http://dx.doi.org/10.1152/ajpgi.00408.2003.

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Inflammation impairs the circular muscle contractile response to muscarinic (M) receptor activation. The aim of this study was to investigate whether the expression of muscarinic receptors, their binding affinity, and the expression and activation of receptor-coupled G proteins contribute to the suppression of contractility in inflammation. The studies were performed on freshly dissociated single smooth muscle cells from normal and inflamed canine ileum. Northern blotting indicated the presence of only M2 and M3 receptors on canine ileal circular muscle cells. Inflammation did not alter the mRNA or protein expression of M2 and M3 receptors. The maximal binding and Kd values also did not differ between normal and inflamed cells. However, the contractile response to ACh in M3 receptor-protected cells was suppressed, whereas that in M2 receptor-protected cells was enhanced. Further experiments indicated that the expression and binding activity of Gαq/11 protein, which couples to M3 receptors, were downregulated, whereas those of Gαi3, which couples to M2 receptors, were upregulated in inflamed cells. We concluded that inflammation depresses M3 receptor function, but it enhances M2 receptor function in ileum. These effects are mediated by the differentially altered expression and binding activity of their respective coupled Gαq/11 and Gαi3 proteins.

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50

Li, Chang, Bing Chen Wang y Jun Feng Li. "The Vibration Model Establishment and Solution of Bending-Torsion-Axial-Swing Coupled the Helical Gear Transmission System Based on Lumped Parameter Approximation Method". Advanced Materials Research 1061-1062 (diciembre de 2014): 743–47. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.743.

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Based on comprehensive considerations the influences of stiffness excitation, deviation excitation, meshing impact excitation, friction of tooth surface, and other kinds of nonlinear factors, it established a nonlinear coupled vibration model of bending-torsion-axial-swing coupled helical gear transmission system by applying the Lumped Mass Method. After transformed the model to dimensionless form, it used Runge-Kutta method to solve the nonlinear vibration model of the system, and then the time domain chart, spectrum chart, phase chart, Poincare chart, and FFT chart were obtained; it discussed the influence of system parameters on its dynamic characteristics.

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