Articoli di riviste: "ELECTRIC RESONANCE"

1

Bleaney, B. "Magneto-electric resonance". Applied Magnetic Resonance 20, n. 1-2 (febbraio 2001): 203–5. http://dx.doi.org/10.1007/bf03162320.

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Tang Ming-Chun, Xiao Shao-Qiu, Deng Tian-Wei, Bai Yan-Ying, Guan Jian e Wang Bing-Zhong. "Miniaturized electric resonance metamaterial". Acta Physica Sinica 59, n. 7 (2010): 4715. http://dx.doi.org/10.7498/aps.59.4715.

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Han, Aoxue, Colm Dineen, Viktoriia E. Babicheva e Jerome V. Moloney. "Second harmonic generation in metasurfaces with multipole resonant coupling". Nanophotonics 9, n. 11 (5 luglio 2020): 3545–56. http://dx.doi.org/10.1515/nanoph-2020-0193.

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AbstractWe report on the numerical demonstration of enhanced second harmonic generation (SHG) originating from collective resonances in plasmonic nanoparticle arrays. The nonlinear optical response of the metal nanoparticles is modeled by employing a hydrodynamic nonlinear Drude model implemented into Finite-Difference Time-Domain (FDTD) simulations, and effective polarizabilities of nanoparticle multipoles in the lattice are analytically calculated at the fundamental wavelength by using a coupled dipole–quadrupole approximation. Excitation of narrow collective resonances in nanoparticle arrays with electric quadrupole (EQ) and magnetic dipole (MD) resonant coupling leads to strong linear resonance enhancement. In this work, we analyze SHG in the vicinity of the lattice resonance corresponding to different nanoparticle multipoles and explore SHG efficiency by varying the lattice periods. Coupling of electric quadrupole and magnetic dipole in the nanoparticle lattice indicates symmetry breaking and the possibility of enhanced SHG under these conditions. By varying the structure parameters, we can change the strength of electric dipole (ED), EQ, and MD polarizabilities, which can be used to control the linewidth and magnitude of SHG emission in plasmonic lattices. Engineering of lattice resonances and associated magnetic dipole resonant excitations can be used for spectrally narrow nonlinear response as the SHG can be enhanced and controlled by higher multipole excitations and their lattice resonances. We show that both ED and EQ–MD lattice coupling contribute to SHG, but the presence of strong EQ–MD coupling is important for spectrally narrow SHG and, in our structure, excitation of narrow higher-order multipole lattice resonances results in five times enhancement.

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Shami, Zein Alabidin, Christophe Giraud-Audine e Olivier Thomas. "A nonlinear piezoelectric shunt absorber with 2:1 internal resonance: experimental proof of concept". Smart Materials and Structures 31, n. 3 (28 gennaio 2022): 035006. http://dx.doi.org/10.1088/1361-665x/ac4ab5.

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Abstract An experimental proof of concept of a new semi-passive nonlinear piezoelectric shunt absorber, introduced theoretically in a companion article, is presented in this work. This absorber is obtained by connecting, through a piezoelectric transducer, an elastic structure to a resonant circuit that includes a quadratic nonlinearity. This nonlinearity is obtained by including in the circuit a voltage source proportional to the square of the voltage across the piezoelectric transducer, thanks to an analog multiplier circuit. Then, by tuning the electric resonance of the circuit to half the value of one of the resonances of the elastic structure, a two-to-one internal resonance is at hand. As a result, a strong energy transfer occurs from the mechanical mode to be attenuated to the electrical mode of the shunt, leading to two essential features: a nonlinear antiresonance in place of the mechanical resonance and an amplitude saturation. Namely, the amplitude of the elastic structure oscillations at the antiresonance becomes, above a given threshold, independent of the forcing level, contrary to a classical linear resonant shunt. This paper presents the experimental setup, the designed nonlinear shunt circuit and the main experimental results.

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Decker, M., T. Pertsch e I. Staude. "Strong coupling in hybrid metal–dielectric nanoresonators". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, n. 2090 (28 marzo 2017): 20160312. http://dx.doi.org/10.1098/rsta.2016.0312.

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We study resonant photonic–plasmonic coupling between a gold dipole nanoantenna and a silicon nanodisc supporting electric and magnetic dipolar Mie-type resonances. Specifically, we consider two different cases for the mode structure of the silicon nanodisc, namely spectrally separate and spectrally matching electric and magnetic dipolar Mie-type resonances. In the latter case, the dielectric nanoparticle scatters the far fields of a unidirectional Huygens’ source. Our results reveal an anticrossing of the plasmonic dipole resonance and the magnetic Mie-type dipole resonance of the silicon nanodisc, accompanied by a clear signature of photonic–plasmonic mode hybridization in the corresponding mode profiles. These characteristics show that strong coupling is established between the two different resonant systems in the hybrid nanostructure. Furthermore, our results demonstrate that in comparison with purely metallic or dielectric nanostructures, hybrid metal–dielectric nanoresonators offer higher flexibility in tailoring the fractions of light which are transmitted, absorbed and reflected by the nanostructure over a broad range of parameters without changing its material composition. As a special case, highly asymmetric reflection and absorption properties can be achieved. This article is part of the themed issue ‘New horizons for nanophotonics’.

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Nguyen Thi, Thuy, Ngoc Tran Minh, Tu Vu Minh e Dung Pham Thi. "STUDY ELECTROMAGNETIC WAVE INTERACTION OF ACTIVE-MATRIX THIN FILM TRANSISTORS". Journal of Science Natural Science 65, n. 10 (ottobre 2020): 24–28. http://dx.doi.org/10.18173/2354-1059.2020-0044.

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Active-matrix thin film transistors (TFTs) on glass substrates with a metal backplane, that are applied for flat panel displays, can be considered as a metamaterial absorber. In this study, TFT structures using doped silicon at source, drain, and channel terminals are investigated. These terminals are unchanged in size of 75 µm square and thickness of 5.3 µm. The electric conductivity is varied at the channel. The simulation results show that the structures with 500 S\m electric conductivity channels absorb incident electromagnetic waves with appropriately 100% at 758 GHz and a wide bandwidth of 20 GHz. As the electrical conductivity increases, the absorption and bandwidth are smaller at the main resonance peak. As the electrical conductivity decreases, the absorption falls at the resonance frequency, but the bandwidth is broadened. In addition, the electric field in the channel may influence the electron in the semiconductor and the electrical current between the source and drain terminals. By observing the electric field at the resonance frequency, we found that it is focused on the sides of channel terminals.

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Thornton, Jack. "Pulling Power from the Road". Mechanical Engineering 136, n. 04 (1 aprile 2014): 44–49. http://dx.doi.org/10.1115/1.2014-apr-3.

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This article presents an overview of charging technology called Shaped Magnetic Field in Resonance (SMFIR). It has been developed by a team of engineers and technologists at the Korea Advanced Institute for Science and Technology. An all-electric bus developed in Korea recharges its battery when it travels over electric coils buried at intervals along its route. The concept is called on-line electric vehicles, and the heart of OLEV technology is the transfer of enough electricity across gaps of up to 10 inches to power a fully loaded bus. Specifically, underground cables transfer power from the electrical grid to drive motors and on-board batteries via pickups beneath the OLEV bus bodies. The OLEV system wirelessly charges a bus, stopped or in motion, for continuous operation. SMFIR transfers rely on electromagnetic field resonance rather than inductive coupling. In SMFIR technology, the sending unit and the vehicle receiver resonate at 20,000 hertz.

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Nakayama, S., H. Akimune, Y. Arimoto, I. Daito, H. Fujimura, Y. Fujita, M. Fujiwara et al. "Isovector Electric Monopole Resonance in60Ni". Physical Review Letters 83, n. 4 (26 luglio 1999): 690–93. http://dx.doi.org/10.1103/physrevlett.83.690.

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Andrianov, B. A. "Electric analog of magnetic resonance". Technical Physics Letters 26, n. 3 (marzo 2000): 228–30. http://dx.doi.org/10.1134/1.1262800.

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Mori, N., N. Nakamura, K. Taniguchi e C. Hamaguchi. "Electric field-induced magnetophonon resonance". Solid-State Electronics 31, n. 3-4 (marzo 1988): 777–80. http://dx.doi.org/10.1016/0038-1101(88)90387-5.

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Liboff, A. R. "Electric-field ion cyclotron resonance". Bioelectromagnetics 18, n. 1 (1997): 85–87. http://dx.doi.org/10.1002/(sici)1521-186x(1997)18:1<85::aid-bem13>3.0.co;2-p.

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12

Melik-Gaykazyan, Elizaveta V., Maxim R. Shcherbakov, Alexander S. Shorokhov, Isabelle Staude, Igal Brener, Dragomir N. Neshev, Yuri S. Kivshar e Andrey A. Fedyanin. "Third-harmonic generation from Mie-type resonances of isolated all-dielectric nanoparticles". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, n. 2090 (28 marzo 2017): 20160281. http://dx.doi.org/10.1098/rsta.2016.0281.

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Subwavelength silicon nanoparticles are known to support strongly localized Mie-type modes, including those with resonant electric and magnetic dipolar polarizabilities. Here we compare experimentally the efficiency of the third-harmonic generation from isolated silicon nanodiscs for resonant excitation at the two types of dipolar resonances. Using nonlinear spectroscopy, we observe that the magnetic dipolar mode yields more efficient third-harmonic radiation in contrast to the electric dipolar (ED) mode. This is further supported by full-wave numerical simulations, where the volume-integrated local fields and the directly simulated nonlinear response are shown to be negligible at the ED resonance compared with the magnetic one. This article is part of the themed issue ‘New horizons for nanophotonics’.

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Taguchi, M. "Poloidal electric field due to electron-cyclotron resonance heating in tokamaks". Journal of Plasma Physics 47, n. 2 (aprile 1992): 261–69. http://dx.doi.org/10.1017/s0022377800024211.

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The poloidal electric field generated by electron-cyclotron resonance heating is investigated for a tokamak plasma in the collisionless regime. This poloidal electric field is calculated by solving an adjoint equation to the linearized Fokker-Planck equation with a quasi-linear diffusion term. It is found from this calculation that the magnitude and the sign of the poloidal electric field depend strongly on the values of the inverse aspect ratio, the poloidal angle of the absorption point, the parallel velocity of resonant electrons normalized by the thermal velocity, and the strength of the relativistic correction to the resonance condition.

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Xu, Wei Kai, Ying Chun Tang e Wei Wang. "Study on the Electromagnetic Responses of Split Ring Resonator in THz Regions". Advanced Materials Research 760-762 (settembre 2013): 302–5. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.302.

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By using the numerical simulation techniques, the response characteristics of single split-ring resonator (SRR) in a broadband terahertz region are analyzed. We examine the transmission and dispersion characteristics of the SRR and show that there are different resonances while changing the orientations of electric field vector relative to the gap-bearing sides. Two significant resonances corresponding to electric response and magnetic response will be observed while the electric field vector perpendicular to the gap-bearing side, and only one electric resonance occurs when the electric field vector parallel to the same side. This will be a reference to design the possible terahertz metamaterials.

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Wang, Shuang, Song Wang, Quan Li, Xiaoli Zhao e Jianyu Zhu. "Dual Toroidal Dipole Resonance Metamaterials under a Terahertz Domain". Materials 11, n. 10 (19 ottobre 2018): 2036. http://dx.doi.org/10.3390/ma11102036.

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We proposed and fabricated a flexible, planar, U-shape-modified structure metamaterial (MM) that was composed of two metallic pattern layers separated by a polyimide layer, where each metallic pattern layer consists of two U-shaped split ring resonators (USRRs). The coupling effect between the two USRRs in the same metallic layer was vital to the formation of dual toroidal dipole (TD) resonances. The measured and simulated results showed that both low quality factor (Q) (~1.82) and high Q (~10.31) TD resonances were acquired synchronously at two different frequencies in the MMs by adjusting the distance between the two coplanar USRRs. With the interaction of the USRRs, the energy levels of the USRRs were split into inductance-capacitance (LC)-induced TD resonance at low frequency and dipole-induced TD resonance at high frequency. Thus, the electric multipole interaction played an important role in determining the energy level of the TD resonance. The better strength of the high frequency TD resonance can be confined to an electromagnetic field inside a smaller circular region, and thus, a higher Q was obtained. In order to investigate the TD mechanism more in depth, the power of the electric dipole, magnetic dipole, electric circular dipole, and TD were quantitatively calculated. Dual TD MMs on a freestanding substrate will have potential applications in functional terahertz devices for practical applications.

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Rosenspire, A. J., A. L. Kindzelskii e H. R. Petty. "Pulsed DC electric fields couple to natural NAD(P)H oscillations in HT-1080 fibrosarcoma cells". Journal of Cell Science 114, n. 8 (15 aprile 2001): 1515–20. http://dx.doi.org/10.1242/jcs.114.8.1515.

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Previously, we have demonstrated that NAD(P)H levels in neutrophils and macrophages are oscillatory. We have also found that weak ultra low frequency AC or pulsed DC electric fields can resonate with, and increase the amplitude of, NAD(P)H oscillations in these cells. For these cells, increased NAD(P)H amplitudes directly signal changes in behavior in the absence of cytokines or chemotactic factors. Here, we have studied the effect of pulsed DC electric fields on HT-1080 fibrosarcoma cells. As in neutrophils and macrophages, NAD(P)H levels oscillate. We find that weak (~10(-)(5) V/m), but properly phased DC (pulsed) electric fields, resonate with NAD(P)H oscillations in polarized and migratory, but not spherical, HT-1080 cells. In this instance, electric field resonance signals an increase in HT-1080 pericellular proteolytic activity. Electric field resonance also triggers an immediate increase in the production of reactive oxygen metabolites. Under resonance conditions, we find evidence of DNA damage in HT-1080 cells in as little as 5 minutes. Thus the ability of external electric fields to effect cell function and physiology by acting on NAD(P)H oscillations is not restricted to cells of the hematopoietic lineage, but may be a universal property of many, if not all polarized and migratory eukaryotic cells.

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Larin, Vasily, e Daniil Matveev. "Study of Transient Interaction in a System with Transformer Supplied from Network through a Cable: Assessment of Interaction Frequencies and Resonance Evolvement". Journal of Energy - Energija 63, n. 1-4 (4 luglio 2022): 252–61. http://dx.doi.org/10.37798/2014631-4185.

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Transformer together with its windings is a complex oscillatory system. The interaction between the transformer and an electric network during transients can cause the development of resonance phenomenon in the windings leading to overvoltages and the risk of transformer fault. This report presents the results of studies of resonance phenomena in transformer windings, caused by interaction with an electric network containing the feeder cable. The approach to a simple assessment of dominant oscillation frequency of a voltage in the system “feeder cable – transformer” and estimation of the resonant frequencies of transformer winding is considered. The report also describes the technique for measurement of winding resonance voltages. The resonance phenomenon evolvement in transformer windings is considered and the impact of decaying oscillating applied voltage on maximum ratio of resonance overvoltages is estimated.

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Chaldyshev, V. V., E. V. Kundelev, A. N. Poddubny, A. P. Vasil'ev, M. A. Yagovkina, Y. Chen, N. Maharjan, Z. Liu, M. L. Nakarmi e N. M. Shakya. "Optical properties of AlGaAs/GaAs resonant Bragg structure at the second quantum state". Физика и техника полупроводников 52, n. 4 (2018): 466. http://dx.doi.org/10.21883/ftp.2018.04.45815.04.

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AbstractPhotoluminescence, optical reflectance and electro-reflectance spectroscopies were employed to study an AlGaAs/GaAs multiple-quantum-well based resonant Bragg structure, which was designed to match optical Bragg resonance with the exciton-polariton resonance at the second quantum state in the GaAs quantum wells. The structure with 60 periods of AlGaAs/GaAs quantum wells was grown on a semi-insulating substrate by molecular beam epitaxy. Broad and enhanced optical and electro-reflectance features were observed when the Bragg resonance was tuned to the second quantum state of the GaAs quantum well excitons manifesting an enhancement of the light-matter interaction under double-resonance conditions. By applying an alternating electric field, we revealed electro-reflectance features related to the x(e2-hh2) and x(e2-hh1) excitons. The excitonic transition x(e2-hh1), which is prohibited at zero electric field, was allowed by a DC bias due to brake of symmetry and increased overlap of the electron and hole wave functions caused by electric field.

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Brescia, Jonathan R., Justin W. Cleary, Evan M. Smith e Robert E. Peale. "Infrared Propagating Electromagnetic Surface Waves Excited by Induction". MRS Advances 5, n. 35-36 (23 dicembre 2019): 1827–36. http://dx.doi.org/10.1557/adv.2019.472.

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AbstractPropagating inhomogeneous electromagnetic waves called surface plasmon polaritons (SPPs) can be excited by free-space beams on corrugated conducting surfaces at resonance angles determined by corrugation period, permittivity, and optical frequency. SPPs are coupled to and co-propagate with surface charge displacements. Complete electrical isolation of individual conducting corrugations prevents the charge displacement necessary to sustain an SPP, such that excitation resonances of traveling SPPs are absent. However, SPPs can be excited via electric induction if a smooth conducting surface exists below and nearby the isolated conducting corrugations. The dependence of SPP excitation resonances on that separation is experimentally investigated here at long-wave infrared wavelengths. We find that excitation resonances for traveling SPPs broaden and disappear as the dielectric’s physical thickness is increased beyond ~1% of the free-space wavelength. The resonance line width increases with refractive index and optical thickness of the dielectric.

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Jo, Subin, Min-Gyu Bae e Joong-Wook Lee. "Controllable Fano-like Resonance in Terahertz Planar Meta-Rotamers". Applied Sciences 11, n. 21 (20 ottobre 2021): 9796. http://dx.doi.org/10.3390/app11219796.

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Meta-molecules composed of meta-atoms exhibit various electromagnetic phenomena owing to the interaction among the resonance modes of the meta-atoms. In this study, we numerically investigated Fano-like-resonant planar metamaterials composed of meta-molecules at terahertz (THz) frequencies. We present meta-rotamers based only on the difference in the spatial position of their component meta-atoms (C- and Y-shapes) that can be interconverted by rotations and have tunable Fano-like resonance. This is because of the cooperative effects determined by the spatial coupling conditions of the nodes and antinodes of electric-dipole and inductive–capacitive (LC) resonances of the meta-atoms. The findings of this study provide potential options for exploring novel THz devices and for engineering high-level functionalities in metamaterial-based devices.

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Kim, Ju Ho, e Chin-Wook Chung. "Plasma and electrical characteristics depending on an antenna position in an inductively coupled plasma with a passive resonant antenna". Plasma Sources Science and Technology 31, n. 1 (1 gennaio 2022): 015002. http://dx.doi.org/10.1088/1361-6595/ac4146.

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Abstract We investigated the plasma and electrical characteristics depending on the antenna position in an inductively coupled plasma with a passive resonant antenna. When the powered antenna and passive resonant antenna are installed near the top plate and in the middle of the cylindrical reactor (setup A), respectively, the ion density at the resonance is about 2.4 times to 9 times higher than that at non-resonance. This is explained by the reduction in power loss in the powered antenna (including the matching circuits) and the increase in power absorbed by the plasma discharge. However, when the powered antenna and passive resonant antenna are interchanged (setup B), the ion density at the resonance is not significantly different from that at the non-resonance. When RF power is changed from 50 to 200 W, the ion density at the resonance of setup B is 1.6 times to 5.4 times higher than at the non-resonance of setup A. To analyse this difference, the profile of the z-axis ion density is measured and the electric and magnetic field simulations are investigated. The results are discussed along with the electron kinetics effect and the coupling loss between the antenna and the metal plate.

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Sersa, I., O. Jarh e F. Demsar. "Magnetic Resonance Microscopy of Electric Currents". Journal of Magnetic Resonance, Series A 111, n. 1 (novembre 1994): 93–99. http://dx.doi.org/10.1006/jmra.1994.1230.

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Babicheva, Viktoriia E., e Jerome V. Moloney. "Lattice effect influence on the electric and magnetic dipole resonance overlap in a disk array". Nanophotonics 7, n. 10 (26 settembre 2018): 1663–68. http://dx.doi.org/10.1515/nanoph-2018-0107.

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AbstractDesigning the shape of silicon nanoparticles has been shown to be an effective approach to increasing overlap between electric and magnetic dipole resonances thereby achieving directional scattering and decrease of reflection. Variations of disk diameter and/or height affect resonances differently and can thus result in resonance overlap. In most of the studies, the disks are arranged in a periodic array where the periodicity is varied together with disk diameter, but the role of lattice effect is neglected. Here we theoretically study a periodic array of disks and show that the contribution of the lattice effect in shifting resonance positions is comparable to the effect of the diameter change. We demonstrate that the lattice effect is important even when the wavelength of diffraction remains on the blue side from electric and magnetic dipole resonances and there are no additional lattice resonances excited. Period and disk dimensions are chosen so that the resonances overlap in the proximity of the telecommunication wavelength which is of great practical interest.

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Qawaqzeh, Mohamed, Roman Zaitsev, Oleksandr Miroshnyk, Mykhailo Kirichenko, Dmytro Danylchenko e Liliia Zaitseva. "High-voltage DC converter for solar power station". International Journal of Power Electronics and Drive Systems (IJPEDS) 11, n. 4 (1 dicembre 2020): 2135. http://dx.doi.org/10.11591/ijpeds.v11.i4.pp2135-2144.

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In the article the circuit design solution of DC-DC regulated resonant converter has been proposed for using with hybrid photovoltaic modules which has cooling equipment and solar concentrators in order to maximize electric power generating by such module. By using computer simulation based on multiple iterations algorithm we significantly increase the accuracy of determining the resonance circuit optimal parameters for build up DC–DC converters to work in a wide range of electric powers. Based on optimal values of the resonance LLC scheme parameters, achived by numerical calculation it can be show high values of electrical energy transformation efficiency for photovoltaic energy station equipped with high efficiency hybrid photovoltaic modules. Implementation of microprocessor-based control into design of DC–DC back-boost converters create a new possibility to build control algorithms for increase reliability and conversion efficiency, rapid and precision stabilization of maximum power point, implementation network monitoring of photovoltaic modules, converters itself and the whole photovoltaic station parameters.

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Wandowski, T., P. Malinowski, L. Skarbek e W. Ostachowicz. "Moisture detection in carbon fiber reinforced polymer composites using electromechanical impedance technique". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, n. 2 (26 febbraio 2015): 331–36. http://dx.doi.org/10.1177/0954406215574239.

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In this paper, electromechanical impedance method was utilized in order to detect moisture level changes in carbon fiber reinforced polymer composites. Due to electromechanical coupling of piezoelectric transducers, glue layer and host structure mechanical resonances are visible in the electric impedance spectrum of transducer. Appearance of additional resonance peaks, their shift in frequency or magnitude change can be treated as indicator of damage or anther anomaly present in the host structure. Research presented in this paper shows that moisture content also has influence on electromechanical resonant peaks.

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TELENKOV, M. P., e YU A. MITYAGIN. "SEQUENTIAL RESONANT TUNNELING BETWEEN LANDAU LEVELS IN GaAs\AlGaAs SUPERLATTICES IN STRONG TILTED MAGNETIC AND ELECTRIC FIELDS". International Journal of Modern Physics B 21, n. 08n09 (10 aprile 2007): 1594–99. http://dx.doi.org/10.1142/s0217979207043269.

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The transverse resonant tunneling transport and electric field domain formation in GaAs/AlGaAs superlattices were investigated in a strong tilted magnetic field. The magnetic field component parallel to structure layers causes intensive tunneling transition between Landau levels with Δn≠0, resulting in the considerable "inhomogeneous" broadening of intersubband tunneling resonance as well as in the shift of the resonance toward higher electric fields. This leads to noticeable changes of the I-V characteristics of the superlattice, namely to smoothing of the periodic NDC structure on plateau-like regions caused by formation of the electric field domains and to the shift of the plateaus toward the higher applied voltage. The predicted behavior of the I-V characteristics of the structures in magnetic field was found experimentally.

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Yin, Xiao-gang, You-wen Liu e Cheng-ping Huang. "Trapped mode resonances in symmetric rectangular-hole tetramers". Journal of Physics D: Applied Physics 55, n. 4 (25 ottobre 2021): 045302. http://dx.doi.org/10.1088/1361-6463/ac2e8d.

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Abstract High Q-factor trapped mode resonances are mostly supported by weakly asymmetric metamolecules. In this paper, we study theoretically and experimentally a planar all-metallic metamaterial comprising highly symmetric metamolecules (rectangular-hole tetramers in a freestanding metallic plate) and find that high Q-factor trapped mode resonances can also be realized. The effect comes from the destructive interference between two anti-phased excitations: the electric dipole modes of the two inner and two outer rectangular holes within individual tetramers. Here, the high Q-factor resonance is dominated by the hole separation that affects greatly the coupling and radiation. At the resonance, a huge enhancement of electric field in each hole appears, accompanied by a significant slow-wave effect in the reflection process. Our design has potential applications in constructing high Q-factor filters, highly sensitive sensors and slow-wave devices.

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Duan, Guan, Yingwei Li e Chi Tan. "A Bridge-Shaped Vibration Energy Harvester with Resonance Frequency Tunability under DC Bias Electric Field". Micromachines 13, n. 8 (31 luglio 2022): 1227. http://dx.doi.org/10.3390/mi13081227.

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A vibration piezoelectric energy harvester (PEH) is usually designed with a resonance frequency at the external excitation frequency for higher energy conversion efficiency. Here, we proposed a bridge-shaped PEH capable of tuning its resonance frequency by applying a direct current (DC) electric field on piezoelectric elements. A theoretical model of the relationship between the resonance frequency and DC electric field was first established. Then, a verification experiment was carried out and the results revealed that the resonance frequency of the PEH can be tuned by applying a DC electric field to it. In the absence of an axial preload, the resonance frequency of the PEH can be changed by about 18.7 Hz under the DC electric field range from −0.25 kV/mm to 0.25 kV/mm. With an axial preload of 5 N and 10 N, the resonance frequency bandwidth of the PEH can be tuned to about 13.4 Hz and 11.2 Hz, respectively. Further experimental results indicate that the output power and charging response of the PEH can also be significantly enhanced under a DC electric field when the excitation frequency deviates from the resonance frequency.

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Zheng, Huadan, Haoyang Lin, Lei Dong, Yihua Liu, Pietro Patimisco, John Zweck, Ali Mozumder et al. "Influence of Tuning Fork Resonance Properties on Quartz-Enhanced Photoacoustic Spectroscopy Performance". Sensors 19, n. 18 (4 settembre 2019): 3825. http://dx.doi.org/10.3390/s19183825.

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A detailed investigation of the influence of quartz tuning forks (QTFs) resonance properties on the performance of quartz-enhanced photoacoustic spectroscopy (QEPAS) exploiting QTFs as acousto-electric transducers is reported. The performance of two commercial QTFs with the same resonance frequency (32.7 KHz) but different geometries and two custom QTFs with lower resonance frequencies (2.9 KHz and 7.2 KHz) were compared and discussed. The results demonstrated that the fundamental resonance frequency as well as the quality factor and the electrical resistance were strongly inter-dependent on the QTF prongs geometry. Even if the resonance frequency was reduced, the quality factor must be kept as high as possible and the electrical resistance as low as possible in order to guarantee high QEPAS performance.

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Batygin, Yuriy, Svitlana Shinderuk, Evgen Chaplygin, Olena Yeryomina e Egor Tereh. "Introduction of an additional source of harmonic signal into the circuit of the electric power resonant amplifier". Automobile transport, n. 51 (29 dicembre 2022): 66–73. http://dx.doi.org/10.30977/at.2219-8342.2022.51.0.07.

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Problem. The problems of the electric power industry, caused by the depletion of the natural resources of the planet and the need to replace them, initiate the development of new physical and technical solutions with the practical use of the known natural phenomena. Goal. The purpose of this work is to propose to introduce an additional source of a harmonic signal (voltage or current) into the circuit of a resonant amplifier of electric power, to obtain calculated analytical dependencies for numerical estimates of the characteristics of ongoing electromagnetic processes, which make it possible to give a fundamental justification for the real performance of the proposed circuit as a whole, taking into account the interaction of all its functional components. Methodology. This work, ultimately, involves the use of resonant phenomena in circuits with active-reactive elements and their theoretical analysis using the mathematical apparatus of the theory of electrical circuits. Results. It is proposed to implement the resonant amplifier circuit in the form of four active-reactive closed circuits inductively coupled to each other. Moreover, in a practical embodiment, inductive couplings can be carried out using HF ferrites. The first circuit is the input circuit with the harmonic power source to be amplified. The second circuit generates amplified reactive power in the "voltage resonance" mode. The third circuit with an additional harmonic voltage source outputs reactive power from the second circuit in the "current resonance" mode. The fourth circuit, inductively coupled to the third circuit, contains the output load of the entire resonant amplifier. This is a resistor that simulates the release of active power. Originality. Physically, the introduction of an additional source in the third circuit is equivalent to the creation of a "negative active resistance", which makes it possible to create conditions for excitation of current resonance with the minimum possible distortion and, ultimately, to reduce the reverse effect on the amplifying processes in the second circuit (reactive power amplifier). The analysis and numerical evaluation of the characteristics of the proposed scheme of the active electric power resonant amplifier showed its fundamental viability. Practical value. As an example, calculations of currents and voltages in the circuit of an experimental model were made, which enabled to formulate recommendations for the selection of elements of a real active electric power amplifier with high efficiency for low-resistance output loads.

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31

Vdovychenko, A. V. "RESONANCE SYSTEM OF WIRELESS ENERGY TRANSMISSION WITH USING OF THE ELECTRIC FIELD". Tekhnichna Elektrodynamika 2023, n. 5 (28 agosto 2023): 8–13. http://dx.doi.org/10.15407/techned2023.05.008.

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The paper reviews the existing types of wireless technologies for power transmission using electromagnetic interaction. According to the type of interaction, systems using magnetic, electric and electromagnetic components are distinguished. Short-range, medium-range and long-range systems are distinguished by range. As promising for implementation in future unmanned systems, the work considers a modified system of wireless transmission of electrical energy using an electric field. The scheme is presented and the principle of operation of such a system is considered. The characteristics of resonant circuits used as emitters and receivers in such a system were studied. The results of measuring the parameters of the spatial distribution of the electric field of the resonators are presented. The interaction of the spectral components of the input signal and the resonant characteristics of the radiating circuits was investigated. The paper presents the method of determining the efficiency of electric energy transmission at high frequencies and the results of measurement of transmission efficiency for the studied type of systems. It was concluded that there is an active factor in the form of an alternating electric field, the feature of which propagation allows creating a device suitable for powering unmanned mobile systems of low and medium power. References 11, figures 4, tables 2.

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32

Grindlay, J. "The driven quantum-mechanical two-level system: small fields and long relaxation times". Canadian Journal of Physics 65, n. 1 (1 gennaio 1987): 82–87. http://dx.doi.org/10.1139/p87-014.

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A formal theory of the long-term response of a dissipative two-level quantum-mechanical system to a monochromatic applied electric field is used to describe the fundamental and third-harmonic resonances in the small-field and long relaxation-times regime. Resonance frequencies, including Bloch–Siegert shifts, and resonance amplitudes for the dipole-moment components and the upper level probability function are obtained. A comparison with the rotating-wave approximation is made.

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33

Liu, Hai, Xu Zhang, Benlei Zhao, Bo Wu, Hancheng Zhang e Shoufeng Tang. "Simultaneous Measurements of Refractive Index and Methane Concentration through Electromagnetic Fano Resonance Coupling in All-Dielectric Metasurface". Sensors 21, n. 11 (22 maggio 2021): 3612. http://dx.doi.org/10.3390/s21113612.

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Dual-parameter measurements of refractive index and methane concentration based on electromagnetic Fano resonance are proposed. Two independent Fano resonances can be produced through electric dipole and toroidal dipole resonance in an all-dielectric metasurface separately. The linear relationship between the spectral peak-shifts and the parameters to be measured will be obtained directly. The refractive index (RI) sensitivity and gas sensitivity are 1305.6 nm/refractive index unit (RIU), −0.295 nm/% for one resonance peak (dip1), and 456.6 nm/RIU, −0.61 nm/% for another resonance peak (dip2). Such a metasurface has simpler structure and higher sensitivity, which is beneficial for environmental gas monitoring or multi-parameter measurements.

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34

Morisaki, Yoshihiko. "Imprisonment of Resonance Radiation in Electric Discharge". IEEJ Transactions on Fundamentals and Materials 118, n. 2 (1998): 107–14. http://dx.doi.org/10.1541/ieejfms1990.118.2_107.

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35

Gopalan, Sudha, S. Rodriguez, J. Mycielski, A. Witowski, M. Grynberg e A. Wittlin. "Electric-dipole spin resonance inn-typeCd1−xMnxSe". Physical Review B 34, n. 8 (15 ottobre 1986): 5466–74. http://dx.doi.org/10.1103/physrevb.34.5466.

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36

Mikac, Urš, Franci Demšar, Katarina Beravs e Igor Serša. "Magnetic resonance imaging of alternating electric currents". Magnetic Resonance Imaging 19, n. 6 (luglio 2001): 845–56. http://dx.doi.org/10.1016/s0730-725x(01)00393-9.

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37

Campbell, W. R. "Practical Solution of Resonance of Electric Motors". Shock and Vibration Digest 26, n. 1 (1 gennaio 1994): 13–16. http://dx.doi.org/10.1177/058310249402600103.

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38

Zhao, Yi-Xin, Hao-Sen Kang, Wen-Qin Zhao, You-Long Chen, Liang Ma, Si-Jing Ding, Xiang-Bai Chen e Qu-Quan Wang. "Dual Plasmon Resonances and Tunable Electric Field in Structure-Adjustable Au Nanoflowers for Improved SERS and Photocatalysis". Nanomaterials 11, n. 9 (25 agosto 2021): 2176. http://dx.doi.org/10.3390/nano11092176.

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Abstract (sommario):

Flower-like metallic nanocrystals have shown great potential in the fields of nanophononics and energy conversion owing to their unique optical properties and particular structures. Herein, colloid Au nanoflowers with different numbers of petals were prepared by a steerable template process. The structure-adjustable Au nanoflowers possessed double plasmon resonances, tunable electric fields, and greatly enhanced SERS and photocatalytic activity. In the extinction spectra, Au nanoflowers had a strong electric dipole resonance located around 530 to 550 nm. Meanwhile, a longitudinal plasmon resonance (730~760 nm) was obtained when the number of petals of Au nanoflowers increased to two or more. Numerical simulations verified that the strong electric fields of Au nanoflowers were located at the interface between the Au nanosphere and Au nanopetals, caused by the strong plasmon coupling. They could be further tuned by adding more Au nanopetals. Meanwhile, much stronger electric fields of Au nanoflowers with two or more petals were identified under longitudinal plasmon excitation. With these characteristics, Au nanoflowers showed excellent SERS and photocatalytic performances, which were highly dependent on the number of petals. Four-petal Au nanoflowers possessed the highest SERS activity on detecting Rhodamine B (excited both at 532 and 785 nm) and the strongest photocatalytic activity toward photodegrading methylene blue under visible light irradiation, caused by the strong multi-interfacial plasmon coupling and longitudinal plasmon resonance.

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39

Jian, Ye, e VanDorpe Pol. "Nanocrosses with Highly Tunable Double Resonances for Near-Infrared Surface-Enhanced Raman Scattering". International Journal of Optics 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/745982.

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Abstract (sommario):

We present asymmetric gold nanocrosses with highly tunable double resonances for the near-infrared (NIR) surface-enhanced Raman scattering (SERS), optimizing electric field enhancement at both the excitation and Stokes Raman wavelengths. The calculated largest SERS enhancement factor can reach a value as large as1.0×1010. We have found that the peak separation, the resonance position, and peak intensity ratio of the double-resonance gold nanocrosses can be tuned by changing the structural dimensions or the light polarization.

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40

Gaponenko, Roman, Ilia Rasskazov, Alexander Moroz, Dmitry Pidgayko, Konstantin Ladutenko, Alexey Shcherbakov e Pavel Belov. "Excitation of a homogeneous dielectric sphere by a point electric dipole". Journal of Physics: Conference Series 2015, n. 1 (1 novembre 2021): 012043. http://dx.doi.org/10.1088/1742-6596/2015/1/012043.

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Abstract Electrically small dielectric antennas are of great interest for modern technologies, since they can significantly reduce the physical size of electronic devices for processing and transmitting information. We investigate the influence of the resonance conditions of an electrically small dielectric spherical antenna with a high refractive index on its directivity and analyze the dependence of these resonances on the effectively excited modes of the dielectric sphere.

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41

Mizuno, Mamoru, Nozomi Odagiri e Mitsuhiro Okayasu. "Variation of Material Properties of Piezoelectric Ceramics due to Electric Loading Evaluated by Resonance Frequency". Key Engineering Materials 345-346 (agosto 2007): 1521–24. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.1521.

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In the present paper, lead zirconate titanate (PZT) and lead titanate (PT) piezoelectric ceramics were subjected to both high electric field (which is higher than the coercive electric field) with low frequency and low electric field with high frequency (which is the resonance frequency). After applying certain electric field systematically, resonance and anti-resonance frequencies and an electrostatic capacity were measured by means of an impedance analyzer, and an electromechanical coupling coefficient, a dielectric constant, an elastic coefficient and a piezoelectric constant were evaluated from the frequencies and capacity measured. Then variation of the material properties in process of time was investigated experimentally, and the dependence of the variation of the properties due to mainly domain switching on conditions of applied electric field was elucidated.

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42

Qu, Mei Ling, Xin Zhi Shi, Chang Qi e Gao Feng Wang. "Analysis and Simulation of Wireless Power Transfer System Based on Magnetic Resonances". Advanced Materials Research 516-517 (maggio 2012): 1737–41. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1737.

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Abstract (sommario):

Wireless power transfer brings the possibility of connector-free for electric devices. Because there is no electric connection between power source and load, the system employs wireless power transfer based on magnetic resonance becomes safer, more convenient and more reliable. The wireless power transfer system of four-coils based on magnetic resonances is analyzed, including phenomenon of frequency splitting, effect of the angle between the source coil and the device coil, and effect of external objects. Simulation results are presented in this paper.

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43

Li, Hui, Yigeng Peng e Ruifeng Lu. "Substrate-Modulated Electric and Magnetic Resonances of Lithium Niobite Nanoparticles Illuminated by White Light". Nanomaterials 12, n. 12 (10 giugno 2022): 2010. http://dx.doi.org/10.3390/nano12122010.

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The manipulation of light at the nanoscale is important for nanophotonic research. Lithium niobite (LiNbO3), as an ideal building block for metamaterials, has attracted great interest for its unique properties in the field of nonlinear optics. In this paper, we numerically studied the effect of different substrates on the optical resonances of a LiNbO3 nanoparticle. The results show that the electric and magnetic resonances of such a system can be effectively adjusted by changing the substrate. Compared to the impact of dielectric substrate, the interaction between the LiNbO3 nanoparticle and the Au film shows a fascinating phenomenon that a sharp resonance peak appears. The multipole decomposition of the scattering spectrum shows that the size, shape of the LiNbO3 nanoparticle, and the thickness of the SiO2 film between the particle and the Au film have a significant impact on the electromagnetic resonance of the LiNbO3 nanoparticle. This work provides a new insight into LiNbO3 nanoparticles, which may have potential use in the design of dielectric nanomaterials and devices.

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44

Persson, Bertil R. R., e Freddy Ståhlberg. "Safety Aspects of Magnetic Resonance Examinations". International Journal of Technology Assessment in Health Care 1, n. 3 (luglio 1985): 647–65. http://dx.doi.org/10.1017/s0266462300001549.

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Abstract (sommario):

In a standard whole-body NMR-scanning machine, the static magnetic field is generated by an electric current driven through large solenoid coils. Dynamic magnetic gradient fields are generated by electric current pulses in coils located at various orientations, thus producing magnetic gradients inx, y, andzdirections. The Rf (radiofrequency) radiation is transmitted through a specially shaped coil which also serves as an antenna receiving the NMR signals.

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45

Samson, J. C., R. Rankin e V. T. Tikhonchuk. "Optical signatures of auroral arcs produced by field line resonances: comparison with satellite observations and modeling". Annales Geophysicae 21, n. 4 (30 aprile 2003): 933–45. http://dx.doi.org/10.5194/angeo-21-933-2003.

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Abstract. We show two examples from the CANOPUS array of the optical signatures of auroral arcs produced by field line resonances on the night of 31 January 1997. The first example occurs during local evening at about 18:00 MLT (Magnetic Local Time), where CANOPUS meridian scanning photometer data show all the classic features of field line resonances. There are two, near-monochromatic resonances (at approximately 2.0 and 2.5 mHz) and both show latitudinal peaks in amplitude with an approximately 180 degree latitudinal phase shift across the maximum. The second field line resonance event occurs closer to local midnight, between approximately 22:00 and 22:40 MLT. Magnetometer and optical data show that the field line resonance has a very low frequency, near 1.3 mHz. All-sky imager data from CANOPUS show that in this event the field line resonances produce auroral arcs with westward propagation, with arc widths of about 10 km. Electron energies are on the order of 1 keV. This event was also seen in data from the FAST satellite (Lotko et al., 1998), and we compare our observations with those of Lotko et al. (1998). A remarkable feature of this field line resonance is that the latitudinal phase shift was substantially greater than 180 degrees. In our discussion, we present a model of field line resonances which accounts for the dominant physical effects and which is in good agreement with the observations. We emphasize three points. First, the low frequency of the field line resonance in the second event is likely due to the stretched topology of the magnetotail field lines, with the field line resonance on field lines threading the earthward edge of the plasma sheet. Second, the latitudinal phase structure may indicate dispersive effects due to electron trapping or finite ion gyroradius. Third, we show that a nonlocal conductivity model can easily explain the parallel electric fields and the precipitating electron energies seen in the field line resonance.Key words. Magnetospheric physics (electric fields; energetic particles precipitating; current systems)

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46

Volkov, S. V., O. V. Goryachev, A. G. Efromeev e A. O. Stepochkin. "Calculation of the Parameters of a Mathematical Model of an Electric Hybrid Stepper Motor Based on the Analysis of the Magneto Static Field Pattern". Mekhatronika, Avtomatizatsiya, Upravlenie 20, n. 8 (8 agosto 2019): 482–89. http://dx.doi.org/10.17587/mau.20.482-489.

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The article presents a solution to the problem of calculating the parameters of a mathematical model of an electric hybrid stepper motor based on an analysis of the picture of its magnetostatic field. The main disadvantage of such an engine described. Is the mid-frequency resonance, which occurs due to the coincidence of the natural frequency of the rotor with the frequency of the supply voltage pulses. The necessity of taking this factor into account when designing a discrete electric drive system based on the executive motor of this type by calculating the values of resonant frequencies and using them in developing the drive control algorithm is shown. The task of developing a mathematical model of the engine is formulated, which allows to analyze the influence of its design parameters on the spectrum of resonant frequencies. The method of calculating the parameters of a given mathematical model is formed. The variants of the mathematical description of this electric machine are considered and the selection of its known mathematical model is made based on the equivalent electric circuit. The numerical calculation of the spatial pattern of the magnetostatic field of the electric motor is performed. Based on the analysis of the calculation results, a system of assumptions has been formed to develop an equivalent magnetic circuit of an electrical machine. An equivalent magnetic circuit and the corresponding system of equations has been developed. Formed a system of equations of a mathematical model based on the equivalent circuits of the electric and magnetic circuits.On the basis of the obtained system of equations, a simulation model of a discrete electric drive was developed in the Simulink software package. Using the obtained simulation model, the calculation of transients on the angle of rotation of the rotor and the electromagnetic moment is carried out and the influence of one of the design parameters on the natural frequency of the rotor is analyzed. Based on the simulation results, it is shown that with an increase in the air gap height of a hybrid stepper motor, the resulting electromagnetic moment decreases, and the natural oscillation frequency of the rotor decreases, and the frequency at which medium-frequency resonance occurs also decreases. This mathematical model can be used at the stage of the correct calculation of the selected engine, since allows you to analyze the effect of a specific design parameter of the machine — in particular the size of the air gap on the natural frequency of the rotor, and, consequently, on the spectrum of the resonant frequencies of a discrete electric drive.

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47

Khomitsky D. V. e Zaprudnov N. A. "Spin-dependent tunneling in a double quantum dot in the "slow" evolution regime". Semiconductors 56, n. 10 (2022): 748. http://dx.doi.org/10.21883/sc.2022.10.55025.9875.

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The tunneling and spin dynamics is studied for the hole states in a GaAs-based double quantum dot in the presence of strong spin-orbit coupling and periodic electric field. The regimes of tunneling with the spin flip are considered for the "slow" evolution when the field frequency is lower than the other energy parameters of the stationary part of the Hamiltonian. It is found that the under such conditions the spin flip tunneling may take place at both resonant and non-resonant regimes with respect to the Zeeman level splitting. In the latter case the driving frequency may be lower compared to the resonance one, and the system dynamics resembles the Landau-Zener-Stuckelberg-Majorana interference effects arising during the dynamic level passage in isolated quantum dots. Keywords: double quantum dot, spin-orbit interaction, Zeeman splitting, tunneling, electric dipole spin resonance.

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48

MUÑUZURI, A. P., V. PÉREZ-MUÑUZURI, M. GÓMEZ-GESTEIRA, V. I. KRINSKY e V. PÉREZ-VILLAR. "MECHANISM OF PARAMETRIC RESONANCE OF VORTICES IN EXCITABLE MEDIA". International Journal of Bifurcation and Chaos 04, n. 05 (ottobre 1994): 1245–56. http://dx.doi.org/10.1142/s0218127494000939.

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Abstract (sommario):

An alternating electric current induces a drift of spiral waves (vortices) in the Belousov-Zhabotinsky reaction. When the electric current frequency is twice the frequency of the vortex rotation, the vortex drifts with a velocity about 1/5 of the vortex drift in a constant electric current or 1/20 of the wave front velocity. The dependence of parametric resonance on the chirality of the vortex, excitability of the medium, phase shift between electric current and vortex rotation, frequency and amplitude of the alternating electric current is analyzed and used to control the direction and velocity of the drift. A kinematical model, based on the asymmetric effect of the current on the normal and tangential velocities of the vortex tip, is formulated and recovers the most important aspects of parametric resonance.

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49

Prestwich, W. V., M. A. Islam e T. J. Kennett. "Electric quadrupole transitions". Canadian Journal of Physics 69, n. 7 (1 luglio 1991): 855–63. http://dx.doi.org/10.1139/p91-139.

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A data set has been compiled consisting of 101 E2 strengths observed in neutron radiative capture. The E2 strength function is found to be consistent with a fifth power energy dependence and mass dependence characterized by a power of n = 1.87 ± 0.07. The observed strengths are on average consistent with those predicted on the basis of the giant quadrupole resonance. A reduction in strengths is apparent near mass regions 28, 82, and 157. Evidence is cited for the possible existence of a direct capture mechanism.

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Maharjan, Nikesh, Vladimir Chaldyshev e Mim Lal Nakarmi. "Resonant optical studies of GaAs/AlGaAs Multiple Quantum Well based Bragg Structures at excited states". MRS Advances 4, n. 11-12 (2019): 651–59. http://dx.doi.org/10.1557/adv.2019.21.

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ABSTRACTOptical reflectance (OR) and electro-reflectance (ER) spectroscopies were employed to study the resonant optical properties of GaAs/AlGaAs multiple quantum wells based Resonant Bragg Structures (RBS) at excited states. The RBS samples have 60 periods of GaAs/AlGaAs quantum well/barrier grown on semi-insulating GaAs substrates by molecular beam epitaxy with slightly different thicknesses of well/barrier. We observed enhanced OR and ER features when exciton energy coincides with the energy of the Bragg reflection peak, a double resonance condition. Bragg peak can significantly be tuned by changing the angle of incidence of the light. Exciton energies can be tuned by changing the temperature, external electric field and the thickness of the quantum wells. By tuning the Bragg peak for double resonance in the RBS samples of different thicknesses, we observed the electro-reflectance features related to the transitions of x(e2-hh2), x(e2-hh1), x(e2-lh1), x(e2-hh3) and x(e1-hh3) excitons along with the sharp features of x(e1-hh1) and x(e1-lh1) ground state exciton transitions from the ER experiments. The excitonic transitions x(e2-hh1), x(e2-lh1) and x(e2-hh3) which are prohibited at zero electric field, were also observed due to the increased overlap of the electron and hole wave functions caused by the electric field; built-in electric field or applied DC bias.

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