Готові списки джерел за темами / Multiharmonic wave

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Добірка наукової літератури з теми "Multiharmonic wave"

Автор: Grafiati

Опубліковано: 28 травня 2022

Оновлено: 31 липня 2025

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Статті в журналах з теми "Multiharmonic wave"

KIM, S. H., R. L. MERLINO, J. K. MEYER, and M. ROSENBERG. "Low-frequency electrostatic waves in a magnetized, current-free, heavy negative ion plasma." Journal of Plasma Physics 79, no. 6 (2013): 1107–11. http://dx.doi.org/10.1017/s0022377813001074.

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AbstractWe report experimental observations of a low-frequency (≪ ion gyrofrequency) electrostatic wave mode in a magnetized cylindrical (Q machine) plasma containing positive ions, very few electrons and a relatively large fraction (n−/ne > 103) of heavy negative ions (m−/m+ ≈ 10), and no magnetic field-aligned current. The waves propagate nearly perpendicular to B with a multiharmonic spectrum. The maximum wave amplitude coincided spatially with the region of largest density gradient suggesting that the waves were excited by a drift instability in a nearly electron-free positive ion–negat

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Reutov, V. P., and G. V. Rybushkina. "Dynamical Chaos and Lateral Transport of a Passive Scalar in the Annular Reverse Jet Flow." Nelineinaya Dinamika 17, no. 3 (2021): 263–74. http://dx.doi.org/10.20537/nd210302.

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The transition to dynamical chaos and the related lateral (cross-flow) transport of a passive scalar in the reverse annular jet flow generating two chains of wave-vortex structures are studied. The quasi-geostrophic equations for the barotropic (quasi-two-dimensional) flow written in polar coordinates with allowance for the beta-effect and external friction are solved numerically using a pseudospectral method. The critical parameters of the equilibrium flow with a complex “two-hump” azimuth velocity profile facilitating a faster transition to the complex dynamics are determined. Two regular mu

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Ghannouchi, F. M., R. Larose, and R. G. Bosisio. "A new multiharmonic loading method for large-signal microwave and millimeter-wave transistor characterization." IEEE Transactions on Microwave Theory and Techniques 39, no. 6 (1991): 986–92. http://dx.doi.org/10.1109/22.81668.

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Sheng, Xueli, Chaoping Dong, Longxiang Guo, and Li Li. "A Bioinspired Twin Inverted Multiscale Matched Filtering Method for Detecting an Underwater Moving Target in a Reverberant Environment." Sensors 19, no. 23 (2019): 5305. http://dx.doi.org/10.3390/s19235305.

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To this day, biological sonar systems still have great performance advantages over artificial sonar systems, especially for detection in environments with clutter, strong reverberation, and a low signal to noise ratio (SNR). Therefore, mammal sonar systems, for instance, bats and toothed whales, have many characteristics worth learning from. This paper proposes a bioinspired twin inverted multiscale matched filtering method to detect underwater moving targets. This method can be mainly divided into three parts. Firstly, a hyperbolic frequency modulation (HFM) continuous wave (CW) multiharmonic

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Wang, Hui, Zhengshi Liu, Bin Zhu, and Quanjun Song. "Multiple Harmonics Fitting Algorithms Applied to Periodic Signals Based on Hilbert-Huang Transform." Journal of Sensors 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/580152.

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A new generation of multipurpose measurement equipment is transforming the role of computers in instrumentation. The new features involve mixed devices, such as kinds of sensors, analog-to-digital and digital-to-analog converters, and digital signal processing techniques, that are able to substitute typical discrete instruments like multimeters and analyzers. Signal-processing applications frequently use least-squares (LS) sine-fitting algorithms. Periodic signals may be interpreted as a sum of sine waves with multiple frequencies: the Fourier series. This paper describes a new sine fitting al

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Lysenko, A. V., I. I. Volk, G. A. Oleksiienko, and A. Ju Brusnyk. "Formation of Powerful Multiharmonic Electromagnetic Wave by Two Stream Superheterodyne Klystron Free Electron Laser with Helical Electron Beam." Journal of Nano- and Electronic Physics 10, no. 5 (2018): 05002–1. http://dx.doi.org/10.21272/jnep.10(5).05002.

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KALTENBACHER, B. "DETERMINATION OF PARAMETERS IN NONLINEAR HYPERBOLIC PDES VIA A MULTIHARMONIC FORMULATION, USED IN PIEZOELECTRIC MATERIAL CHARACTERIZATION." Mathematical Models and Methods in Applied Sciences 16, no. 06 (2006): 869–95. http://dx.doi.org/10.1142/s0218202506001388.

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In this paper we consider the problem of determining material parameter curves that appear as coefficients in nonlinear partial differential equations of hyperbolic type. In order to demonstrate our ideas of an identification method for this class of problems, we consider the model problem of identifying c in the nonlinear wave equation dtt - (c(dx)dx)x = 0 from boundary measurements. Motivated by the fact that in many applications, this inverse problem is naturally posed in frequency domain rather than in time domain, we work in the Fourier transformed setting. Here, nonlinearity can be accou

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Reutov, V. P., та G. V. Rybushkina. "Unsteady chains of wave structures and anomalous transport of а passive scalar in a barotropic jet flow". Известия Российской академии наук. Физика атмосферы и океана 55, № 6 (2019): 201–10. http://dx.doi.org/10.31857/s0002-3515556201-210.

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The onset of anomalous transport of a passive scalar at the excitation of unsteady chains of wave structures with closed streamlines in a barotropic jet flow modeling zonal flows in the Earths atmosphere and ocean and in laboratory experiments is investigated. The analysis is performed within a dynamical model describing saturation of the barotropic instability in a plane-parallel channel flow with allowance for the beta-effect and external friction. The equations of a quasi-two-dimensional flow are solved numerically with the aid of a pseudospectral method. It is found that the generation of

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Lysenko, A., G. Oleksiienko, and I. Volk. "Longitudinal electrostatic field effect on width of multiharmonic space-charge wave frequency spectrum in two-stream superheterodyne FEL with a helical electron beam." RADIOFIZIKA I ELEKTRONIKA 25, no. 1 (2020): 70–79. http://dx.doi.org/10.15407/rej2020.01.070.

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Tatarko, Marek, Sandro Spagnolo, Veronika Oravczová, et al. "Changes of Viscoelastic Properties of Aptamer-Based Sensing Layers Following Interaction with Listeria innocua." Sensors 21, no. 16 (2021): 5585. http://dx.doi.org/10.3390/s21165585.

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A multiharmonic quartz crystal microbalance (QCM) has been applied to study the viscoelastic properties of the aptamer-based sensing layers at the surface of a QCM transducer covered by neutravidin following interaction with bacteria Listeria innocua. Addition of bacteria in the concentration range 5 × 103–106 CFU/mL resulted in a decrease of resonant frequency and in an increase of dissipation. The frequency decrease has been lower than one would expect considering the dimension of the bacteria. This can be caused by lower penetration depth of the acoustics wave (approximately 120 nm) in comp

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Більше джерел

Дисертації з теми "Multiharmonic wave"

Лисенко, Олександр Володимирович (ЕлІТ), Александр Владимирович (ЕлІТ) Лысенко, Oleksandr Volodymyrovych (ЕлІТ) Lysenko та ін. "Мультигармонічні властивості хвиль просторового заряду у двошвидкісній електронній системі". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39479.

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Робота присвячена теоретичному дослідженню генерації та взаємодії гармонік хвиль просторового заряду (ХПЗ) у двошвидкісному електронному пучку. Актуальність цього питання зумовлена тим, що такі процеси покладені в основу роботи мультигармонічних двопотокових лазерів на вільних електронах.

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Edgerton, James Becton. "Finite amplitude acoustic waves generated by a baffled, multiharmonic transducer." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/17898.

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Частини книг з теми "Multiharmonic wave"

Kennel, Charles F. "The Bell-Like Magnetosphere." In Convection and Substorms. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195085297.003.0006.

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The fact that the geomagnetic field “pulsates” was known a century before the space age opened. The century of ground-based observations did lead to an effective empirical classification of the pulsations based on period, wave form, and geographical distribution (Section 3.1), but why the magnetic field of an astronomical body should oscillate on short time scales was a first-class scientific puzzle that could only by solved in the space age. Low-frequency hydromagnetic waves were first observed in the distant magnetosphere on Explorer 6 (Judge and Coleman, 1962). The task for space research w

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Тези доповідей конференцій з теми "Multiharmonic wave"

Moon, Justin, J. Rafael Pacheco, and Arturo Pacheco-Vega. "Heat Transfer Enhancement in Wavy Micro-Channels Through Multiharmonic Surfaces." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86425.

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In this study, three-dimensional numerical simulations are performed to investigate heat transfer enhancement in multi-harmonic micro-scale wavy channels. The focus is on the influence of channel surface-topography, modeled as multi-harmonic sinusoidal waves of square cross-sectional area, on the enhancing mechanisms. A single-wave device of 0.5 mm × 0.5 mm × 20 mm length, is used as baseline, and new designs are built with harmonic-type surfaces. The channel is enclosed by a solid block, with the bottom surface within the sinusoidal region being exposed to a 47 W/cm2 heat flux. The numerical

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Lysenko, Alexander, Galyna Oleksiienko, Iurii Volk, Alexandr Shmat'ko, and Mykhailo Korovai. "Longitudinal Electric Field Effect on Multiharmonic Space Charge Wave Formation in Two-Stream Superheterodyne FEL." In 2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON). IEEE, 2019. http://dx.doi.org/10.1109/ukrcon.2019.8879948.

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Ilin, Stanislav, and Alexander Lysenko. "Interactions of Multiharmonic Space Charge Waves in Amplification Section of Superheterodyne Free Electron Laser." In 2022 IEEE 2nd Ukrainian Microwave Week (UkrMW). IEEE, 2022. http://dx.doi.org/10.1109/ukrmw58013.2022.10036989.

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