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Articoli di riviste sul tema "Oscillations"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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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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11

W. Hussein, Mohammed, and Kadhim A. Al-Asadi. "Synchronous Impact of the North Atlantic Oscillation (NAO) and Southern Oscillation Index (SOI( Poles on Temperature and Rain Over Iraq." Israa University Journal for Applied Science 7, no. 1 (2023): 290–302. http://dx.doi.org/10.52865/exzs7896.

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Background: This study is an attempt to analyze the correlation of the impact of the North Atlantic Oscillation( NAO )and Southern Oscillation Index( SOI ) on the climate of Iraq. Method: This has been conducted based on the highest and lowest recorded values of the mentioned oscillations. The values of temperature and rain for the stations of Mosul, Baghdad, Rutba, Basrah and for a major climatic cycle from 1950-2018 were also relied upon. On the statistical analytical approach to find the correlation relationship between the studied oscillations and depending on the Pearson Correlation Coeff

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12

Chon, Ki H., Ramakrishna Raghavan, Yu-Ming Chen, Donald J. Marsh, and Kay-Pong Yip. "Interactions of TGF-dependent and myogenic oscillations in tubular pressure." American Journal of Physiology-Renal Physiology 288, no. 2 (2005): F298—F307. http://dx.doi.org/10.1152/ajprenal.00164.2004.

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We have previously shown that there are two oscillating components in spontaneously fluctuating single-nephron blood flow obtained from Sprague-Dawley rats (Yip K-P, Holstein-Rathlou NH, and Marsh DJ. Am J Physiol Renal Physiol 264: F427–F434, 1993). The slow oscillation (20–30 mHz) is mediated by tubuloglomerular feedback (TGF), whereas the fast oscillation (100 mHz) is probably related to spontaneous myogenic activity. The fast oscillation is rarely detected in spontaneous tubular pressure because of its small magnitude and the fact that tubular compliance filters pressure waves. We detected

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13

Kuzmychov, I., O. Lukash, O. Senkevych, and O. Gribovsky. "SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS." Radio physics and radio astronomy 30, no. 1 (2025): 065–73. https://doi.org/10.15407/rpra30.01.065.

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Subject and Purpose. The subject of the work is the behavior of "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors embedded in the waveguide transmission line. We seek to determine physical patterns and features of the interaction between volume "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors. Methods and Methodology. Basic quasi-optical techniques were employed. The electric field structures of considered oscillation types were measured using the probe-induced perturbation method

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14

Lizunov, Petro, and Valentyn Nedin. "Transmission shafts vibrations in transient rotating modes." Strength of Materials and Theory of Structures, no. 110 (June 26, 2023): 229–37. http://dx.doi.org/10.32347/2410-2547.2023.110.229-237.

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The paper presents the investigation results of the transmission shaft dynamic behavior in transient modes of motion with change of the rotational speeds. Such modes occur during the transmission shaft transmits torque from engine to executive device. This process can be accompanied by vibration with change of frequency and amplitude of shaft oscillation. Therefore, the question of studying the dynamic behavior of such systems with identifying the impact of rotational speeds changing on them is relevant. In this regard, the study was done by developed software, in which a technique of computer

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15

Ханин, Ю. Н., та Е. Е. Вдовин. "Квантовые осцилляции релаксации фотопроводимости в p-i-n-гетеродиодах GaAs/InAs/AlAs". Физика и техника полупроводников 52, № 6 (2018): 591. http://dx.doi.org/10.21883/ftp.2018.06.45921.8679.

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AbstractThe photoconductivity and its relaxation characteristics in tunneling p – i – n GaAs/AlAs heterostructures under pulsed illumination is studied. Quantum oscillations in the photoconductivity are detected depending on the bias voltage with the period independent of the light wavelength, as well as an oscillating component of the relaxation curves caused by modulation of the recombination rate at the edge of a triangular quantum well in the undoped i layer, as in the case of photoconductivity oscillations. The common nature of oscillations of the steady-state photoconductivity and relaxa

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16

Mitura, Z., S. L. Dudarev, and M. J. Whelan. "Theoretical Investigations of RHEED Oscillations." Microscopy and Microanalysis 5, S2 (1999): 710–11. http://dx.doi.org/10.1017/s1431927600016871.

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Nowadays there is great interest in the application of reflection high energy electron diffraction (RHEED) to monitor the growth of ultra thin films. This popularity of RHEED arose from the discovery of RHEED intensity oscillations in the early eighties. Namely, it was experimentally found that if the growth of a material follows a layer-by-layer mode then regular oscillating changes in the intensity of the specular beam occur, and the period of the oscillations corresponds to the deposition of one atomic layer of the material. These findings are of great practical importance and consequently

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17

Singh, Vasundhara, Prakash Srirangam, and Gour Gopal Roy. "Effect of Beam Oscillation on Microstructure and Mechanical Properties of Electron Beam Welded EN25 Steel." Materials 16, no. 7 (2023): 2717. http://dx.doi.org/10.3390/ma16072717.

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EN25 steels have been found to be applicable in shafts, gears, etc., but welding of EN25 steel was performed using electron beam welding with different oscillation beam diameters varying from 2 mm to 0.5 mm. The present study reports the effect of beam oscillation on the evolution of nonmetallic inclusions, microstructures, and mechanical properties of EN25 steel. Heat input calculations showed that the application of beam oscillations resulted in significantly lower heat inputs compared to their non-oscillating counterparts. The highest fraction of the retained austenite (9.35%) was observed

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18

Bathellier, Brice, Alan Carleton, and Wulfram Gerstner. "Gamma Oscillations in a Nonlinear Regime: A Minimal Model Approach Using Heterogeneous Integrate-and-Fire Networks." Neural Computation 20, no. 12 (2008): 2973–3002. http://dx.doi.org/10.1162/neco.2008.11-07-636.

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Fast oscillations and in particular gamma-band oscillation (20–80 Hz) are commonly observed during brain function and are at the center of several neural processing theories. In many cases, mathematical analysis of fast oscillations in neural networks has been focused on the transition between irregular and oscillatory firing viewed as an instability of the asynchronous activity. But in fact, brain slice experiments as well as detailed simulations of biological neural networks have produced a large corpus of results concerning the properties of fully developed oscillations that are far from th

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19

Kozlov, Victor, Stanislav Subbotin, and Ivan Karpunin. "Supercritical Dynamics of an Oscillating Interface of Immiscible Liquids in Axisymmetric Hele-Shaw Cells." Fluids 8, no. 7 (2023): 204. http://dx.doi.org/10.3390/fluids8070204.

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The oscillation of the liquid interface in axisymmetric Hele-Shaw cells (conical and flat) is experimentally studied. The cuvettes, which are thin conical layers of constant thickness and flat radial Hele-Shaw cells, are filled with two immiscible liquids of similar densities and a large contrast in viscosity. The axis of symmetry of the cell is oriented vertically; the interface without oscillations is axially symmetric. An oscillating pressure drop is set at the cell boundaries, due to which the interface performs radial oscillations in the form of an oscillating “tongue” of a low-viscosity

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20

Zhileykin, Mikhail M., Pavel V. Sirotin, Sergey S. Nosikov, and Nikolay N. Pulyaev. "Method for detecting the loss of stability of the movement of tractors when towing a trailer or a coupled unit." Tractors and Agricultural Machinery 90, no. 1 (2023): 39–48. http://dx.doi.org/10.17816/0321-4443-321266.

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BACKGROUND:Currently, combines and tractors, being the most energy-intensive transport and technological machines for agricultural purposes, largely determine the possibility of transition to an efficient and environmentally friendly agricultural economy, and also provide the technical aspect of the transformation of the agro-industrial complex into the leading sector of the countrys industry. One of the sources of dynamic loads in the units and subsystems of tractor equipment are self-oscillating modes. AIMS:Study of the conditions for the occurrence of self-oscillating processes in the

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21

Nakariakov, Valery M., and Naga V. Yelagandula. "Damping Scenarios of Kink Oscillations of Solar Coronal Loops." Universe 9, no. 2 (2023): 95. http://dx.doi.org/10.3390/universe9020095.

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The transition from the large-amplitude rapidly-decaying regime of kink oscillations of plasma loops observed in the corona of the Sun to the low-amplitude decayless oscillations is modelled. In this study, the decayless regime is associated with the energy supply from coronal plasma flows, i.e., self-oscillations, or random movements of footpoints of the oscillating loop. The damping is attributed to the linear effect of resonant absorption. We demonstrate that the decay of an impulsively excited kink oscillation to the self-oscillatory stationary amplitude differs from the exponential decay.

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Vrublevskyi, Ihor. "INCREASING OF VIBRATORY CONVEYING VELOCITY BY OPTIMIZING THE NORMAL VIBRATION." Ukrainian Journal of Mechanical Engineering and Materials Science 9, no. 2 (2023): 26–35. http://dx.doi.org/10.23939/ujmems2023.02.026.

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The paper is dedicated to researching the influence of normal vibration on the vibratory conveying velocity of particles on an inclined track that performs independent longitudinal and normal oscillations (two-component vibration). The study considers the optimizing conditions of the conveying velocity for different laws of oscillating components (harmonic, polyharmonic, oscillations with piecewise constant acceleration) with a limited value of the longitudinal acceleration of conveying track and with maximal normal acceleration that does not exceed the gravitational acceleration (non-hopping

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Zaitsev, Valery V., Alexander V. Karlov, and Husamuldin K. M. Alalvan. "Discrete time model of self-oscillations with spectral line widening." Physics of Wave Processes and Radio Systems 25, no. 4 (2022): 27–32. http://dx.doi.org/10.18469/1810-3189.2022.25.4.27-32.

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An algorithm for generating quasi-harmonic self-oscillations with a uniformly widened spectral line is presented. The algorithm is based on the equation of motion of the Thomson-type DT-oscillator, which introduced a random effect in the form of band-pass white noise. Two types of effects are implemented: additive and parametric. Spectral characteristics of generated self-oscillations were analyzed by numerical experiment. The additive algorithm is shown to generate self-oscillations with amplitude-frequency fluctuations. Frequency fluctuations set the Lorentz (resonant) shape of the central p

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Shen, Yuandeng. "Multi-wavelength observations of filament oscillations induced by shock waves." Proceedings of the International Astronomical Union 11, S320 (2015): 106–8. http://dx.doi.org/10.1017/s1743921316000193.

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AbstractTwo cases of filament oscillations induced by large-scale coronal shock waves are presented. For the first case, a chain of transverse oscillating filaments are observed in a proper order after the passing of a shock wave, and it is found that the they were triggered by the surface component of the dome-shaped shock wave. For the second case, simultaneous transverse oscillation of a limb prominence and longitudinal oscillation in an on-disk filament are launched by a single shock wave. It is found that the interaction angle between the shock wave and the prominence axis is the key to l

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Bakala, Pavel, Kateřina Goluchová, Eva Šrámková, et al. "Simulations of flux variability of oscillating accretion fluid tori around Kerr black holes." Proceedings of the International Astronomical Union 10, S313 (2014): 380–81. http://dx.doi.org/10.1017/s1743921315002525.

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AbstractHigh frequency quasi-periodic oscillations (HF QPOs) are observed in the X-ray power-density spectra (PDS) of several microquasars and low mass X-ray binaries. Many proposed QPO models are based on oscillations of accretion toroidal fluid structures orbiting in the vicinity of a compact object. We study oscillating accretion tori orbiting in the vicinity of a Kerr black hole. We demonstrate that significant variation of the observed flux can be caused by the combination of radial and vertical oscillation modes of a slender, polytropic, perfect fluid, non-self-graviting torus with const

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Kontomaris, S. V., and A. Malamou. "Nonlinear oscillations in a constant gravitational field." Physica Scripta 97, no. 1 (2022): 015202. http://dx.doi.org/10.1088/1402-4896/ac4552.

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Abstract Exploring non-linear oscillations is a challenging task since the related differential equations cannot be directly solved in terms of elementary functions. Thus, complicated mathematical or numerical methods are usually employed to find accurate or approximate expressions that describe the behavior of the system with respect to time. In this paper, the vertical oscillations of an object under the influence of its weight and an opposite force with magnitude F = cyn, where n > 0 are being explored. Accurate and approximate simple solutions regarding the object’s position with respec

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Richards, G. A., and M. C. Janus. "Characterization of Oscillations During Premix Gas Turbine Combustion." Journal of Engineering for Gas Turbines and Power 120, no. 2 (1998): 294–302. http://dx.doi.org/10.1115/1.2818120.

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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 premix 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 applicatio

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Dolmetsch, R. E., and R. S. Lewis. "Signaling between intracellular Ca2+ stores and depletion-activated Ca2+ channels generates [Ca2+]i oscillations in T lymphocytes." Journal of General Physiology 103, no. 3 (1994): 365–88. http://dx.doi.org/10.1085/jgp.103.3.365.

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Stimulation through the antigen receptor (TCR) of T lymphocytes triggers cytosolic calcium ([Ca2+]i) oscillations that are critically dependent on Ca2+ entry across the plasma membrane. We have investigated the roles of Ca2+ influx and depletion of intracellular Ca2+ stores in the oscillation mechanism, using single-cell Ca2+ imaging techniques and agents that deplete the stores. Thapsigargin (TG; 5-25 nM), cyclopiazonic acid (CPA; 5-20 microM), and tert-butylhydroquinone (tBHQ; 80-200 microM), inhibitors of endoplasmic reticulum Ca(2+)-ATPases, as well as the Ca2+ ionophore ionomycin (5-40 nM

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Fabrikant, A. L. "Harbour oscillations generated by shear flow." Journal of Fluid Mechanics 282 (January 10, 1995): 203–17. http://dx.doi.org/10.1017/s0022112095000103.

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A new mechanism that could be responsible for excitation of long-period oscillations in partially enclosed harbours is discussed. This mechanism is based on the interaction between a shear flow and the harbour-basin natural mode and does not suppose any external exciting forces caused by wind waves, tsunami, etc. The growth rate of harbour oscillations is found in terms of a plane-wave reflection coefficient integrated on the wavenumber spectrum of the oscillating outflow field near the harbour entrance. Analytical considerations for simple shear flows (vortex sheet and jet) show that the grow

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Liu, Cheng, Guowei Cai, Deyou Yang, Zhenglong Sun, and Mingna Zhang. "The Online Identification of Dominated Inter-area Oscillations Interface Based on the Incremental Energy Function in Power System." Open Electrical & Electronic Engineering Journal 10, no. 1 (2016): 88–100. http://dx.doi.org/10.2174/1874129001610010088.

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The online identification of power system dominated inter-area oscillations interface based on the incremental energy function method is proposed in this paper. The dominant inter-area oscillations interface can be obtained by calculating branch oscillation potential energy, which is tie-line concentrated by oscillations energy. To get the oscillation energy caused by the different mechanism (free oscillation and forced oscillation), different fault position, different oscillation source. Power system dominated inter-area oscillations interface can be effectively obtained by proposed method, a

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Csernovszky, Z., M. Hömöstrei, and K. Kurucz. "Study of damped oscillations using Phyphox and Arduino controlled Hall-sensor." Journal of Physics: Conference Series 2693, no. 1 (2024): 012004. http://dx.doi.org/10.1088/1742-6596/2693/1/012004.

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Abstract The paper presents physics education activities organized around the topic of damped oscillations. We used the Phyphox smartphone application for secondary school physics classes. These activities served as a basis for a physics education workshop, where an Arduino-controlled Hall-sensor and the Phyphox Magnetometer were presented. The problem of a damped pendulum, a vertical oscillation in water, and an LCr oscillating circuit was examined as part of a Phyphox project. Mechanical and electromagnetic damped oscillations can be demonstrated with our devices. Using our data, we could co

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Hayatdavoodi, Masoud, Yongbo Chen, Binbin Zhao, and R. Cengiz Ertekin. "Experiments and computations of wave-induced oscillations of submerged horizontal plates." Physics of Fluids 35, no. 1 (2023): 017121. http://dx.doi.org/10.1063/5.0132569.

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Wave-induced oscillations of submerged horizontal plates are studied by conducting laboratory experiments and by developing theoretical and computational models. These models include a linear solver based on the Green-function method, a nonlinear model based on Green–Naghdi wave equations, and a model based on computational fluid dynamics. The submerged horizontal plate oscillates in the vertical direction due to oscillatory wave loads. Oscillations of the plate are controlled by the use of a spring-damper system. Laboratory measurements and the models provide quantitative information on (i) h

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S., C. Pal, and S. Banerjee R. "Sequential oscillations in B-Z oscillating system with vanillin as substrate." Journal of Indian Chemical Society Vol. 76, Jul 1999 (1999): 339–43. https://doi.org/10.5281/zenodo.5848634.

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Department of Chemistry, University College of Science, University of Calcutta, 92 Acharya Prafulla Chandra Road, Calcutta-700 009, India <em>Manuscript received 15 December 1998, revised 18 March 1999, accepted 19 March 1999</em> Sequential oscillations have been observed in B-Z oscillating system containing vanillin as a single substrate as also along with acetone. Ferroin and Mu<sup>ll </sup>ions have been used as catalysts both separately and in combination. Only Mn<sup>ll</sup> ions have been found to be suitable for inducing second phase oscillations. Oscillation parameters have bee

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Blasone, M., F. Giacosa, L. Smaldone, and G. Torrieri. "Flavor neutrinos as unstable particles: an interaction picture view." Journal of Physics: Conference Series 2883, no. 1 (2024): 012012. http://dx.doi.org/10.1088/1742-6596/2883/1/012012.

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Abstract This paper reviews the similarities in the behavior of unstable particles and oscillating neutrinos using perturbation theory within the interaction picture of quantum field theory. We begin by examining how decaying systems are studied in the interaction picture and then demonstrate how similar calculations can be performed to determine the transition probabilities for flavor oscillations. Notably, the expressions for neutrino oscillations and particle decays are identical in the short-time range. Furthermore, we show that the flavor oscillation formula derived through this method ma

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A., N. OJHA, and BHATHENA K. "Sequential Oscillations with Entrainment Type Behaviour in Mixed Substrate BZ System." Journal of Indian Chemical Society Vol. 67, Oct. 1990 (1990): 806–8. https://doi.org/10.5281/zenodo.6243664.

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Department of Chemistry. Ranchi University, Ranchi <em>Manuscript received  19 October 1989, revised 23 April 1990, accepted 9 July 1990</em> Sequential oscillations in redox potential have been observed in BZ oscillating system on mixing solution A* containing acetone dicarboxylic acid with citric acid ethyl acetoacetate or acetylacetone. An entrainment type behaviour also occurred marked by a dominant high amplitude phase of oscillation at two different temperatures. These are attributed to large number of intermediates effective in triggering off the oscillations. A tentative mechanism

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Li, Ming, BianJiang Li, Na Cai, Wei Zhao, and QingChun Lei. "Research on the oscillating combustion characteristics of single-head combustion chambers based on POD." Journal of Physics: Conference Series 3026, no. 1 (2025): 012065. https://doi.org/10.1088/1742-6596/3026/1/012065.

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Abstract A study on the oscillating combustion characteristics of a single-head combustion chamber was conducted in the paper. A particle image velocimetry system was used to obtain high-resolution flame images. The proper orthogonal decomposition method is employed to obtain the modal distribution of the flame images and to demonstrate the spatial oscillation structure of the flame. The study finds that the convergent design of the single-head combustion chamber and the position of the igniter can lead to intense oscillations during combustion, which is of great significance for the subsequen

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Mureşan, Raul C., Ovidiu F. Jurjuţ, Vasile V. Moca, Wolf Singer, and Danko Nikolić. "The Oscillation Score: An Efficient Method for Estimating Oscillation Strength in Neuronal Activity." Journal of Neurophysiology 99, no. 3 (2008): 1333–53. http://dx.doi.org/10.1152/jn.00772.2007.

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We present a method that estimates the strength of neuronal oscillations at the cellular level, relying on autocorrelation histograms computed on spike trains. The method delivers a number, termed oscillation score, that estimates the degree to which a neuron is oscillating in a given frequency band. Moreover, it can also reliably identify the oscillation frequency and strength in the given band, independently of the oscillation in other frequency bands, and thus it can handle superimposed oscillations on multiple scales ( theta, alpha, beta, gamma, etc.). The method is relatively simple and f

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38

LI, QIAN SHU, and RUI ZHU. "MESOSCOPIC DESCRIPTION OF CHEMICAL SUPERCRITICAL HOPF BIFURCATION." International Journal of Bifurcation and Chaos 14, no. 07 (2004): 2393–97. http://dx.doi.org/10.1142/s0218127404010643.

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The mesoscopic dynamic behavior of the Oregonator model of the Belousov–Zhabotinsky chemical reaction is investigated as the model system experiences a supercritical Hopf bifurcation from focus to limit cycle oscillation. The study is performed by stochastically simulating the corresponding chemical master equation. Comparing the mesoscopic dynamic results with those obtained by the macroscopic dynamics, we find in the mesoscopic description a new type of oscillating state, in which large-amplitude oscillations and small-amplitude oscillations appear randomly alternately. This new state comes

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Xakimovich, Siddikov Isomiddin, and Umurzakova Dilnoza Maxamadjanovna. "Optimal control of the dynamics of nonlinear oscillating systems using synergetic principles of self-organization." International Journal of Electrical and Computer Engineering (IJECE) 14, no. 6 (2024): 6271. http://dx.doi.org/10.11591/ijece.v14i6.pp6271-6278.

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This paper analyses the evolution of nonlinear oscillation control methods and presents an innovative approach known as analytical design of aggregated oscillation controllers (ADACO). This method is based on the principles of synergetic control theory and focuses on the integration of self-organization and control processes to synthesize energy-efficient control laws for nonlinear oscillating systems. The authors elaborate on the theoretical foundations of ADACO, which extends the previous analytical design of aggregated controllers (ADAC) method by incorporating energy invariants and integra

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Fisher, C. E., and K. S. Ball. "Plume Dynamics in Natural Convection in a Horizontal Cylindrical Annulus." Journal of Heat Transfer 121, no. 3 (1999): 598–602. http://dx.doi.org/10.1115/1.2826021.

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Measurements of the unsteady temperature fluctuations in the plume region between differentially heated horizontal concentric cylinders are reported. In particular, power spectral density estimates of the temperature fluctuations within the plume show the development and breakdown of the oscillatory plume structure at high Rayleigh number, Rad, by two relatively independent processes: (1) the development of harmonic oscillations related to the dominant plume oscillation frequency, and (2) interactions between the oscillating plume and the adjacent relatively stagnant core flow (shear and entra

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Manor, Yair, John Rinzel, Idan Segev, and Yosef Yarom. "Low-Amplitude Oscillations in the Inferior Olive: A Model Based on Electrical Coupling of Neurons With Heterogeneous Channel Densities." Journal of Neurophysiology 77, no. 5 (1997): 2736–52. http://dx.doi.org/10.1152/jn.1997.77.5.2736.

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Manor, Yair, John Rinzel, Idan Segev, and Yosef Yarom. Low-amplitude oscillations in the inferior olive: a model based on electrical coupling of neurons with heterogeneous channel densities. J. Neurophysiol. 77: 2736–2752, 1997. The mechanism underlying subthreshold oscillations in inferior olivary cells is not known. To study this question, we developed a single-compartment, two-variable, Hodgkin-Huxley-like model for inferior olive neurons. The model consists of a leakage current and a low-threshold calcium current, whose kinetics were experimentally measured in slices. Depending on the maxi

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Shi, Laishun, Jian Gao, and Jingjing Chen. "Modeling study for oscillatory reaction of chlorite – iodide – ethyl acetoacetate." Canadian Journal of Chemistry 92, no. 5 (2014): 417–25. http://dx.doi.org/10.1139/cjc-2014-0072.

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Chlorine dioxide based chemical oscillating behavior was modeled by a simple scheme consisting of three component reactions. Furthermore, little is known about the influence of the pH value. In this study, four component reactions were used to model the chlorite – iodide – ethyl acetoacetate oscillating reaction by dynamic analysis software. The oscillatory phenomenon is observed for concentration changes of triiodide ion, chlorite ion, and hydrogen ion. The initial concentration of ethyl acetoacetate, chlorite ion, iodide ion, and hydrogen ion has great influence on oscillations. The amplitud

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Tagliazucchi, M., and I. Szleifer. "Dynamics of dissipative self-assembly of particles interacting through oscillatory forces." Faraday Discussions 186 (2016): 399–418. http://dx.doi.org/10.1039/c5fd00115c.

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Dissipative self-assembly is the formation of ordered structures far from equilibrium, which continuously uptake energy and dissipate it into the environment. Due to its dynamical nature, dissipative self-assembly can lead to new phenomena and possibilities of self-organization that are unavailable to equilibrium systems. Understanding the dynamics of dissipative self-assembly is required in order to direct the assembly to structures of interest. In the present work, Brownian dynamics simulations and analytical theory were used to study the dynamics of self-assembly of a mixture of particles c

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Choi, Jeong Ryeol. "Quadrature Squeezing and Geometric-Phase Oscillations in Nano-Optics." Nanomaterials 10, no. 7 (2020): 1391. http://dx.doi.org/10.3390/nano10071391.

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Abstract (sommario):

The geometric phase, as well as the familiar dynamical phase, occurs in the evolution of a squeezed state in nano-optics as an extra phase. The outcome of the geometric phase in that state is somewhat intricate: its time behavior exhibits a combination of a linear increase and periodic oscillations. We focus in this work on the periodic oscillations of the geometric phase, which are novel and interesting. We confirm that such oscillations are due purely to the effects of squeezing in the quantum states, whereas the oscillation disappears when we remove the squeezing. As the degree of squeezing

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Aboutalebi, Payam, Fares M’zoughi, Itziar Martija, Izaskun Garrido, and Aitor J. Garrido. "Switching Control Strategy for Oscillating Water Columns Based on Response Amplitude Operators for Floating Offshore Wind Turbines Stabilization." Applied Sciences 11, no. 11 (2021): 5249. http://dx.doi.org/10.3390/app11115249.

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In this article, a new strategy for switching control has been proposed with the aim of reducing oscillations in floating offshore wind turbines. Such oscillations lead to a shortage in the system’s efficiency, lifespan and harvesting capability of wind and wave energies. In order to study the decreasing of undesired oscillations in the system, particularly in pitch and top tower fore-aft movements, a square-shaped platform barge equipped with four symmetric oscillating water columns has been considered. The oscillating water columns’ air flux valves allow to operate the air columns so that to

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Getahun, Getachew. "A Review of Simple Harmonic Motion for Mass Spring System and Its Analogy to the Oscillations in LC Circuit." Journal of Physical and Chemical Sciences 6, no. 3 (2018): 05. https://doi.org/10.5281/zenodo.1402378.

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Simple harmonic motion comes up in many places in physics and provides a generic first approximation to models of oscillatory motion. The mass oscillating on a spring and the oscillation of LC circuit appear to have little in common because the two systems are apparently different systems but both can be described in terms of second order differential equations with constant coefficients of the same form. With the absence of friction in the mass-spring system, the oscillations would continue indefinitely and we obtain equations for the ways in which the displacement, velocity and acceleration

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47

Potkonjak, N., Lj Kolar-Anić, T. Potkonjak, S. Nikola Blagojević, and S. Anić. "Oscillatory Phenomena during Anodic Copper Electrodissolution in Trifluoroacetic Acid Solution." Materials Science Forum 518 (July 2006): 301–6. http://dx.doi.org/10.4028/www.scientific.net/msf.518.301.

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This work presents the current oscillation phenomena observed in an electrochemical Cu/0.5 M CF3COOH system. The dynamical response of this new oscillator was followed by both current density-potential (j-E) and current density-time (j-t) curves. The current oscillation phenomena of the investigated system were monitored over various potential scan rates and constant applied potentials as control parameters. The increase of potential scan rate significantly decreases both the potential range of current oscillations and the frequency of oscillations. At the j-t curves both the simple and the co

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48

Popov, Tzvetan, and Paul Szyszka. "Alpha oscillations govern interhemispheric spike timing coordination in the honey bee brain." Proceedings of the Royal Society B: Biological Sciences 287, no. 1921 (2020): 20200115. http://dx.doi.org/10.1098/rspb.2020.0115.

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In 1929 Hans Berger discovered the alpha oscillations: prominent, ongoing oscillations around 10 Hz in the electroencephalogram of the human brain. These alpha oscillations are among the most widely studied brain signals, related to cognitive phenomena such as attention, memory and consciousness. However, the mechanisms by which alpha oscillations affect human cognition await demonstration. Here, we suggest the honey bee brain as an experimentally more accessible model system for investigating the functional role of alpha oscillations. We found a prominent spontaneous oscillation around 18 Hz

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Kornyushin, Yuri. "Uniform plasma oscillations in ellipsoid of conductive material." Facta universitatis - series: Physics, Chemistry and Technology 3, no. 1 (2004): 35–39. http://dx.doi.org/10.2298/fupct0401035k.

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The influence of the shape of a sample on the type of uniform dipole collective electrons oscillations is discussed. In samples of a bulk shape uniform bulk dipole oscillation (Langmuir oscillation) cannot exist. It exists in samples of a thin slab shape only. As uniform bulk dipole oscillations cannot penetrate ellipsoidal samples of conductive material they exist in the surface layer of a sample only (Mie oscillations). Frequencies of Mie oscillations are calculated for a sample of the shape of an arbitrary ellipsoid.

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50

Lanets, O. S., V. T. Dmytriv, V. M. Borovets, I. A. Derevenko, and I. M. Horodetskyy. "Analytical Model of the Two-Mass Above Resonance System of the Eccentric-Pendulum Type Vibration Table." International Journal of Applied Mechanics and Engineering 25, no. 4 (2020): 116–29. http://dx.doi.org/10.2478/ijame-2020-0053.

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AbstractThe article deals with atwo-mass above resonant oscillatory system of an eccentric-pendulum type vibrating table. Based on the model of a vibrating oscillatory system with three masses, the system of differential equations of motion of oscillating masses with five degrees of freedom is compiled using generalized Lagrange equations of the second kind. For given values of mechanical parameters of the oscillatory system and initial conditions, the autonomous system of differential equations of motion of oscillating masses is solved by the numerical Rosenbrock method. The results of analyt

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