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Letteratura scientifica selezionata sul tema "Oscillations"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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Articoli di riviste sul tema "Oscillations"

1

Xu, Jun, Zongjun Ning, Dong Li, Fanpeng Shi, Yuxiang Song, and Yuzhi Yang. "An Investigation of the Loop Oscillations after a Solar Flare." Universe 10, no. 5 (2024): 201. http://dx.doi.org/10.3390/universe10050201.

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We study the loop oscillations after a solar flare on 19 January 2023, in the active region N11E40 3196, which is well observed by the SDO/AIA. After tracing the loop position and fitting, we find that the loop oscillations have a period between 3 and 9 min at various locations, such as from the leg to the top or from the inner to the outer loop. Their oscillating amplitudes decrease with time. Two loops display the position oscillation simultaneously with their brightness oscillation. After the analysis of the differential emission measure (DEM), we find that two of their loop position oscill

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2

Klimov, Alexandr V., and Akop V. Antonyan. "Research of features of oscillating process’ behavior in the nonlinear system of individual traction drive of an electrobus." Izvestiya MGTU MAMI 17, no. 1 (2023): 87–96. http://dx.doi.org/10.17816/2074-0530-115233.

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BACKGROUND: When a vehicle is in motion, self-oscillations which properties are dependent on slip rate in a contact patch may occur in the area of tire interaction with ground surface. Oscillations frequency will vary in dependence with value of wheel slip relative to ground surface. Soft self-oscillations are excited by variable set of initial conditions at full slip in traction and driven wheel rolling modes as well as in mixed braking mode with partial slip. Hard mode of self-oscillations occurs at full wheel slip in braking mode. These processes have a negative impact on the processes in e

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3

SHUKLA, P. K. "Amplification of neutrino oscillations by a density ripple in dense plasmas." Journal of Plasma Physics 77, no. 3 (2011): 289–91. http://dx.doi.org/10.1017/s002237781000070x.

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AbstractIt is shown that a pre-existing electron density ripple in a dense plasma can excite electron neutrino oscillations. For our purposes, we use the dispersion relation for neutrino oscillations and derive the Mathieu equation for the propagation of neutrino oscillations in the presence of a spatially oscillating electron density ripple. The Mathieu equation predicts instability of neutrino oscillations. The criterion under which instability occurs is presented. Analytical expressions for the neutrino oscillation frequency and the growth rate are obtained. The possible relevance of our in

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4

Dolgopolov, S. I. "Mathematical simulation of hard excitation of cavitation self-oscillations in a liquid-propellant rocket engine feed system." Technical mechanics 2021, no. 1 (2021): 29–36. http://dx.doi.org/10.15407/itm2021.01.029.

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Hard self-oscillation excitation differs from soft excitation in that self-oscillations are set up only if the initial departure of an oscillating system from equilibrium is strong enough. Experimental studies of cavitation oscillations in hydraulic systems with cavitating pumps of liquid-propellant rocket engines ((LPREs) include works that describe hard excitation of cavitation oscillations. By mow, hard excitation regimes have not been explained theoretically, to let alone their mathematical simulation. This paper presents a mathematical model of hard excitation of cavitation oscillations i

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5

Li, Xiuchen, Jie Li, Zhaohui Zheng, Jinni Deng, Yi Pan, and Xiaobin Ding. "A self-oscillating gel system with complex dynamic behavior based on a time delay between the oscillations." Soft Matter 18, no. 3 (2022): 482–86. http://dx.doi.org/10.1039/d1sm01635k.

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A series of self-oscillating gels with different cross-linking densities are designed and fabricated. Due to the time delay between chemical and mechanical oscillation, they exhibit different oscillating behaviors. The disrupted mechanical oscillations tend to be regular and periodic under inhibited conditions.

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6

Li, Shubo, Chengxun Yuan, Iya P. Kurlyandskaya, et al. "Measurements of fluctuating electron temperature and space potential in a magnetized plasma with a single magnetically insulated baffled probe (MIBP)." Plasma Sources Science and Technology 31, no. 3 (2022): 037001. http://dx.doi.org/10.1088/1361-6595/ac5228.

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Abstract A single magnetically insulated baffled probe (MIBP) was used to study the potential and electron temperature oscillations in a magnetized plasma. It was shown, that, although the MIBP cluster allows a more detailed study of such oscillations, the single MIBP may provide useful information about the oscillation amplitudes and, in some cases, cross-coherency and cross-phase. These quantities can characterize oscillations and distinguish co-oscillating plasma parameters in cases where the placing of a MIBP cluster in a plasma is difficult or impossible. For the reported plasma case, in

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7

Hehner, Marc T., Davide Gatti, Marios Kotsonis, and Jochen Kriegseis. "Effects of actuation mode on plasma-induced spanwise flow oscillations." Journal of Physics D: Applied Physics 55, no. 20 (2022): 205203. http://dx.doi.org/10.1088/1361-6463/ac526b.

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Abstract Two different plasma actuation strategies for producing near-wall flow oscillations, namely the burst-modulation and beat-frequency mode, are characterized with planar particle image velocimetry in quiescent air. Both concepts are anticipated to work as non-mechanical surrogates of oscillating walls aimed at turbulent flow drag reduction, with the added benefit of no moving parts, as the fluid is purely manipulated by plasma-generated body forces. The current work builds upon established flow-control and proof-of-concept demonstrators, as such, delivering an in-depth characterization

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8

Shulaev, N. S., G. F. Efimova, and A. Z. Abdullaev. "STUDY OF AN OSCILLATING CHARGE IN A DIPOLE-QUADRUPOLE SYSTEM." Petroleum Engineering 21, no. 1 (2023): 178–82. http://dx.doi.org/10.17122/ngdelo-2023-1-178-182.

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The solution of the problem of determining the magnitude of the component of the electric field intensity vector generated by an oscillating charge in a dipole-quadrupole system in a homogeneous medium is obtained. Two mutually perpendicular directions of charge oscillations in a cylindrical coordinate system are considered. From the analysis of the obtained dependences for the oscillation frequencies, it can be seen that in the first case, the frequency of «vertical» oscillations exceeds the frequency of «horizontal» oscillations. Knowing the maximum and minimum frequencies of the oscillating

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9

Kohutova, P., and A. Popovas. "Excitation and evolution of coronal oscillations in self-consistent 3D radiative MHD simulations of the solar atmosphere." Astronomy & Astrophysics 647 (March 2021): A81. http://dx.doi.org/10.1051/0004-6361/202039491.

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Context. Solar coronal loops are commonly subject to oscillations. Observations of coronal oscillations are used to infer physical properties of the coronal plasma using coronal seismology. Aims. Excitation and evolution of oscillations in coronal loops is typically studied using highly idealised models of magnetic flux tubes. In order to improve our understanding of coronal oscillations, it is necessary to consider the effect of realistic magnetic field topology and evolution. Methods. We study excitation and evolution of coronal oscillations in three-dimensional (3D) self-consistent simulati

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10

Rana, Zibaei, Sadegh Zakerhamidi Mohammad, Korram Sirous, and Ranjkesh Amid. "Effects of polarized light on the optical and self-oscillation behaviors of liquid crystal network polymers." Journal of Materials Chemistry C 9, no. 41 (2021): 14908–15. https://doi.org/10.1039/D1TC03870B.

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The phenomenon of self-oscillation is abundant in nature, which often occurs in response to various environmental stimuli. The most common stimuli for these processes are heat and light. Oscillations based on bending are one type of self-oscillating phenomenon. In this study, oscillations frequency and amplitude of liquid crystalline polymer network (LCN) structures with light are investigated. Due to the anisotropy of LCN, which originates from a specific orientation in the LCN surfaces, all studies are performed with polarized light to accurately determine the effect of different orientation

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Tesi sul tema "Oscillations"

1

Kuzovkov, Vladimir, Guntars Zvejnieks, Olaf Kortlüke, and Niessen Wolfgang von. "Forced oscillations in self-oscillating surface reaction models." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-195406.

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Kuzovkov, Vladimir, Guntars Zvejnieks, Olaf Kortlüke, and Niessen Wolfgang von. "Forced oscillations in self-oscillating surface reaction models." Diffusion fundamentals 2 (2005) 27, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14357.

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3

Andes, Derek. "Orbital oscillations." Thesis, University of Iowa, 2011. https://ir.uiowa.edu/etd/919.

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4

Fraser, Geoffrey Alan. "Nonradial oscillations in Spica." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24667.

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The absorption line profiles of Spica (α Virginis, HD116658, B1.5IV, m=0.97) show features, at about the 1% level, moving from the blue wavelengths towards the red wavelengths. A series of spectra were taken, at the 1.22 m telescope at the Dominion Astrophysical Observatory on three nights in April, 1982 and two nights in April, 1984, to study these moving features. As Spica is a member of a binary system, the effect of the secondary had to be removed from the observations. This was done by subtracting a template spectrum which had been scaled, broadened and shifted to match the secondary, fro

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5

Rangavajhula, Krishna C. "Nonstationary oscillations through bifurcations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23875.pdf.

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6

Reid, Giles Adrian. "Neutrino Oscillations in Astrophysics." Thesis, University of Canterbury. Physics and Astronomy, 2010. http://hdl.handle.net/10092/4935.

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A survey of the theory of neutrino oscillations in dense matter and neutrino backgrounds is presented. We discuss collective neutrino systems using the gyroscopic pendulum analogy and describe the motion that results from self-induced parametric resonances. The effects of dense matter on the flavour oscillations of neutrinos are also detailed. This theory is applied to the case of continuous supernova neutrino spectra and explanations of the spectral swapping behaviour seen in numerical studies are summarized. The results of numerical simulations of supernova oscillations in turbulent superno

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7

Pennequin, Denis. "Contrôle optimal et oscillations." Paris 1, 2000. http://www.theses.fr/2000PA010061.

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Dans cette thèse, nous nous sommes intéressés au problème du Contrôle Optimal des oscillations et à quelques applications économiques. Tout d'abord, on a mis en forme le formalisme de Percival liant une fonction quasi-périodique (=q. P. ) à sa génératrice sur le tore, avec un lien se comportant bien au niveau différentiel. Une étude du cas à paramètre, nécessaire pour traiter des équations autonomes, permet d'obtenir un théorème d'isomorphisme entre l'espace des fonctions presque- périodiques ( =p. P. ) à paramètres et un espace de fonctions p. P. à valeurs dans un Banach. Relativement au form

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8

Todd, Thomas. "Robust oscillations in cells." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685923.

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Oscillating chemical signals in cells play an essential role in biological processes. Understanding how to produce reliable oscillators using cellular machinery is useful for genetic engineering and is a key goal of synthetic biology. Motivated by an analysis of the robustness of a biological oscillator found in the cell cycle, a new technique is developed to evaluate the robustness of nonlinear models of oscillating genetic networks. This technique has been embedded in a software framework called INTRON which can be used by biologists seeking to design robust genetic oscillators or to underst

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9

Amon, Axelle. "Dynamique temporelle des oscillateurs paramétriques optiques continus : oscillations multimodes, oscillations en rafales et chaos." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2003. http://tel.archives-ouvertes.fr/tel-00004477.

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Les oscillateurs paramétriques optiques (OPO) continus sont des sources de lumière cohérente largement accordables reposant sur l'interaction paramétrique de trois champs dans un cristal non-linéaire. Leur utilité est aussi bien liée à cette accordabilité (spectroscopie) qu'aux propriétés quantiques propres au système (génération d'états comprimés, photons jumeaux). D'autre part, en tant que systèmes non-linéaires, les OPO sont susceptibles de présenter une grande richesse de phénomènes dynamiques temporels et spatio-temporels. Nous présentons une étude expérimentale, théorique et numérique de

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10

Schwabedal, Justus Tilmann Caspar. "Phase dynamics of irregular oscillations." Phd thesis, Universität Potsdam, 2010. http://opus.kobv.de/ubp/volltexte/2011/5011/.

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In der vorliegenden Dissertation wird eine Beschreibung der Phasendynamik irregulärer Oszillationen und deren Wechselwirkungen vorgestellt. Hierbei werden chaotische und stochastische Oszillationen autonomer dissipativer Systeme betrachtet. Für eine Phasenbeschreibung stochastischer Oszillationen müssen zum einen unterschiedliche Werte der Phase zueinander in Beziehung gesetzt werden, um ihre Dynamik unabhängig von der gewählten Parametrisierung der Oszillation beschreiben zu können. Zum anderen müssen für stochastische und chaotische Oszillationen diejenigen Systemzustände identifiziert werde

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Libri sul tema "Oscillations"

1

Suekane, Fumihiko. Quantum Oscillations. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70527-5.

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2

Suekane, Fumihiko. Neutrino Oscillations. Springer Japan, 2015. http://dx.doi.org/10.1007/978-4-431-55462-2.

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3

Kovacic, Ivana. Nonlinear Oscillations. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53172-0.

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4

Nayfeh, Ali Hasan. Nonlinear oscillations. Wiley, 1995.

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5

Saker, Samir. Oscillation theory of dynamic equations on time scales: Second and third orders. LAP Lambert Academic Publishing, 2010.

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6

Sukharev, I︠U︡ I. Wave oscillations in colloid oxyhydrates. Trans Tech Publications, 2010.

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7

Rogers, Graham. Power System Oscillations. Springer US, 2000.

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Françoise, Jean-Pierre. Oscillations en biologie. Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-37670-4.

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9

Rabinovich, M. I., and D. I. Trubetskov. Oscillations and Waves. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1033-1.

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10

Fitzpatrick, Richard. Oscillations and Waves. CRC Press, 2018. http://dx.doi.org/10.1201/9781351063104.

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Capitoli di libri sul tema "Oscillations"

1

Arnold, V. I. "Oscillations." In Mathematical Methods of Classical Mechanics. Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4757-2063-1_5.

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2

Kuehn, Christian. "Oscillations." In Applied Mathematical Sciences. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12316-5_13.

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3

Kamal, Ahmad A. "Oscillations." In 1000 Solved Problems in Classical Physics. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11943-9_6.

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4

Kronauer, Richard E. "Oscillations." In Handbook of Applied Mathematics. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-1423-3_13.

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5

Stix, Michael. "Oscillations." In Astronomy and Astrophysics Library. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56042-2_5.

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6

Lifshits, M. A. "Oscillations." In Gaussian Random Functions. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8474-6_7.

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7

Timberlake, Todd Keene, and J. Wilson Mixon. "Oscillations." In Undergraduate Lecture Notes in Physics. Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3207-8_4.

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Papachristou, Costas J. "Oscillations." In Introduction to Mechanics of Particles and Systems. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54271-9_5.

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Woodhouse, Nicholas M. J. "Oscillations." In Springer Undergraduate Mathematics Series. Springer London, 2009. http://dx.doi.org/10.1007/978-1-84882-816-2_6.

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10

Ilie, Carolina C., Zachariah S. Schrecengost, and Elina M. van Kempen. "Oscillations." In Classical Mechanics. CRC Press, 2022. http://dx.doi.org/10.1201/9781003365709-5.

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Atti di convegni sul tema "Oscillations"

1

Sheikhbahaei, A., and H. Bayati Abdi. "Molecular Oscillation Technology and Its Application on Corrosion and Scaling Control in Industrial Equipments." In CORROSION 2011. NACE International, 2011. https://doi.org/10.5006/c2011-11385.

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Abstract Each element, each molecule has its own typical natural molecular oscillation. This natural oscillation is unique and compares well with the human finger print. We are able to isolate record and store these oscillations. Based on these original oscillations we could develop new active oscillation. The aim is to influence the original oscillation of the element in question through new active oscillations in such a way that ultimately the physical properties of the element or of the molecule are modified in the water. The results are rust molecules disintegrate in an unstable form and a

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2

Bons, Jeffrey, Matthew Frankhouser, and James Gregory. "Synchronized Flow Control of Dynamic Stall under Coupled Pitch and Freestream Oscillations." In Vertical Flight Society 73rd Annual Forum & Technology Display. The Vertical Flight Society, 2017. http://dx.doi.org/10.4050/f-0073-2017-12005.

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This work presents results of an experimental investigation into synchronized active flow control of a Sikorsky SSC-A09 airfoil undergoing periodic pitching motion in an unsteady free stream using leading edge blowing. The airfoil was evaluated at reduced pitching frequencies up to k=0.05 at steady Mach numbers of 0.2 and 0.4, and at k=0.025 with phase-locked pitch and Mach oscillations at Mach 0.4±0.07 at Reynolds numbers from 1.5 to 3 million. A spanwise row of vortex generator jets (VGJs) located at 10% chord is fed by an oscillating valve that is phase-locked to the pitch oscillation of th

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3

Šimkovic, Fedor. "Neutrino oscillations and entanglement." In 12th Neutrino Oscillation Workshop. Sissa Medialab, 2025. https://doi.org/10.22323/1.473.0018.

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4

Richards, George A., and Michael C. Janus. "Characterization of Oscillations During Premix Gas Turbine Combustion." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-244.

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The use of premix combustion in stationary gas turbines can produce very low levels of NOx emissions. This benefit is widely recognized, but turbine developers routinely encounter problems with combustion oscillations during the testing of new pre mix combustors. Because of the associated pressure fluctuations, combustion oscillations must be eliminated in a final combustor design. Eliminating these oscillations is often time-consuming and costly because there is no single approach to solve an oscillation problem. Previous investigations of combustion stability have focused on rocket applicati

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5

Kerenyi, K., S. Hillisch, H. Drobir, and T. Staubli. "Flow Visualization of Oscillating Rectangular Prisms Arranged in Arrays and in Isolation." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0549.

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Abstract This study examines the flow around an isolated rectangular prism as well as around and through an array of equidistant bars. These prisms are excited to oscillate by the flow for certain experimental parameters due to a lightly damped suspension. The experiments with suspension allowing oscillations with mechanically uncoupled, orthogonal degrees of freedom are described, as is the hydrogen bubble technique employed for visualization. A first interpretation of flow images is given starting with the stationary, single bar at various incidence angles of the flow. In a next step the osc

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6

Paine, Garth. "Oscillations." In CHI'16: CHI Conference on Human Factors in Computing Systems. ACM, 2016. http://dx.doi.org/10.1145/2851581.2891083.

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Yoshida, T., and T. Watanabe. "Numerical Simulations of Two-Dimensional Incompressible Flows Over Cavities and Their Control." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37410.

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We investigate numerically self-sustained oscillating flows over open cavities. The incompressible Navier-Stokes equations are solved using finite difference method for two-dimensional cavities with an upstream laminar boundary layer. A series of simulations are performed for a variety of cavity length to depth ratio. The results show mode switchings among nonoscillations, mode II and mode III oscillations. Variation of Strouhal number is in good agreement with available experimental data. The results of flow fields in the cavity reveal the relationship between the cavity shear layer oscillati

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Rupasinghe, B. W. H. A., and U. D. Annakkage. "Identifying the presence of forced oscillations using oscillation signatures." In 2017 IEEE International Conference on Industrial and Information Systems (ICIIS). IEEE, 2017. http://dx.doi.org/10.1109/iciinfs.2017.8300376.

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Li, Xiaopeng, Xiangxi Duan, Fuchuan Hao, et al. "An Estimation Algorithm for Oscillation Frequency under Power Oscillations." In 2021 3rd Asia Energy and Electrical Engineering Symposium (AEEES). IEEE, 2021. http://dx.doi.org/10.1109/aeees51875.2021.9402978.

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Tamura, Tetsuro, and Yoshiaki Itoh. "Numerical Study on Aeroelastic Instability of a Rectangular Cylinder in Heaving Oscillations." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0061.

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Abstract The unsteady three-dimensional flows around a forced-oscillating or freely oscillating rectangular cylinder are numerically simulated by means of the direct finite difference method without any turbulence model. We discuss the accuracy of the present method for prediction of unsteady aerodynamic forces and responses to various dynamic properties. First we examine the aerodynamic forces in case of forced oscillation with D/B = 2 of a rectangular cylinder through the comparison with experiments. Also, in order to understand fundamental behaviors of unstable oscillations of a rectangular

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Rapporti di organizzazioni sul tema "Oscillations"

1

Shadwick, B. A., and P. J. Morrison. On neutral plasma oscillations. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10180029.

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2

Loreti, F. N., and A. B. Balantekin. Neutrino oscillations in noisy media. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10166926.

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3

Janus, M. C., and G. A. Richards. A model for premixed combustion oscillations. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/379049.

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4

Connolly, Roger. Decoherence of Betatron Oscillations in RHIC. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/1119243.

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5

Himmel, Alexander I. Antineutrino Oscillations in the Atmospheric Sector. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1015386.

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6

Berman, G. P., D. K. Campbell, E. N. Bulgakov, and I. V. Krive. Quantum chaos in Aharonov-Bohm oscillations. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/119976.

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7

Friedland, Alexander. Collective neutrino oscillations in a supernova. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1078368.

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Avram, Florin, and Murrad S. Taqqu. Probability Bounds for M-Skorohod Oscillations. Defense Technical Information Center, 1986. http://dx.doi.org/10.21236/ada187981.

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Carroll III, Thomas Joseph. Three-Flavor Neutrino Oscillations with MINOS+. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1576527.

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Ko, Kwok. Spurious Oscillations in High Power Klystrons. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/813234.

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