Log in

Relevant bibliographies by topics / Oscillation period / Journal articles

To see the other types of publications on this topic, follow the link: Oscillation period.

Journal articles on the topic 'Oscillation period'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Oscillation period.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

2

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

3

Hinrichsen, Peter F. "Nonlinear oscillator acceleration and period variation with amplitude." American Journal of Physics 91, no. 12 (2023): 979–87. http://dx.doi.org/10.1119/5.0139124.

Full text

Abstract:

A classic nonlinear spring mass oscillator, the nonlinearity of which could be varied by changing the initial stretching of the spring, was used to investigate how the amplitude dependence of the period and the harmonic content depended on the nonlinearity. The oscillations were measured with a photogate and a MEMS accelerometer, allowing both the oscillation period and the Fourier components of the motion to be precisely determined. The results were in good agreement with theory.

APA, Harvard, Vancouver, ISO, and other styles

4

Bezruchko, Boris, Mihail Prokhorov, and Evgeny Seleznev. "Oscillation types, multistability, and basins of attractors in symmetrically coupled period-doubling systems." Izvestiya VUZ. Applied Nonlinear Dynamics 10, no. 4 (2002): 47–68. http://dx.doi.org/10.18500/0869-6632-2002-10-4-47-68.

Full text

Abstract:

Symmetrically coupled nonlinear oscillator systems demonstrating transition to chaos via a sequence of period-doubling bifurcations under the control parameter variation exhibit various types of mutual synchronization. For these coupled systems, with dissipatively coupled logistic maps, we consider a hierarchy of possible oscillation types using the magnitude оf the time shift between subsystem oscillations аs а basis for multistable states classification. For oscillation states and their basins of attraction the ways of evolution are studied under nonlinearity and coupling variation. Obtained

APA, Harvard, Vancouver, ISO, and other styles

5

Sadeghi, Rayhane, and Ehsan Tavabi. "Characteristics of chromospheric oscillation periods in magnetic bright points." Monthly Notices of the Royal Astronomical Society 512, no. 3 (2022): 4164–70. http://dx.doi.org/10.1093/mnras/stac574.

Full text

Abstract:

ABSTRACT In this investigation, oscillation periods in Mg ii k-line intensity, brightness temperature, and Doppler velocity obtained above magnetic bright points (MBPs) are investigated. For this purpose, data from the Interface Region Imaging Spectrometer (IRIS) observing the higher chromosphere and transition region (TR) were analysed, together with imaging and magnetogram data obtained by the Solar Dynamics Observatory(SDO). The MBPs were identified by combining Si iv 1403-Å slit-jaw images with magnetogram information from the Heliospheric and Magnetic Imager (HMI). A time-slice analysis f

APA, Harvard, Vancouver, ISO, and other styles

6

Dinh, Nguyen Van. "A note on the method of harmonic balance." Vietnam Journal of Mechanics 23, no. 1 (2001): 34–38. http://dx.doi.org/10.15625/0866-7136/9938.

Full text

Abstract:

Free oscillation period of the Duffing oscillator with cubic non-linearity was examined. A comparison between the exact period and those obtained by the asymptotic and the harmonic balance methods was done. It was shown that the remits given by the harmonic balance are acceptable even for large oscillations whereas the asymptotic method can only be applied for small oscillations.

APA, Harvard, Vancouver, ISO, and other styles

7

Kontomaris, Stylianos Vasileios, Georgios Chliveros, and Anna Malamou. "Approximate Solutions for Undamped Nonlinear Oscillations Using He’s Formulation." J 6, no. 1 (2023): 140–51. http://dx.doi.org/10.3390/j6010010.

Full text

Abstract:

Solving nonlinear oscillations is a challenging task due to the mathematical complexity of the related differential equations. In many cases, determining the oscillation’s period requires the solution of complicated integrals using numerical methods. To avoid the complexity, there are many empirical equations in the literature that can be used instead of rigorous mathematical analysis to provide an acceptable approximation. In this paper, a recently developed method, He’s formulation, is applied to find the period in many different cases of nonlinear oscillators. The cases are those of the Duf

APA, Harvard, Vancouver, ISO, and other styles

8

Kaur, Manpreet, Amy Ng, Pyonghwa Kim, Casey Diekman, and Yong-Ick Kim. "CikA Modulates the Effect of KaiA on the Period of the Circadian Oscillation in KaiC Phosphorylation." Journal of Biological Rhythms 34, no. 2 (2019): 218–23. http://dx.doi.org/10.1177/0748730419828068.

Full text

Abstract:

Cyanobacteria contain a circadian oscillator that can be reconstituted in vitro. In the reconstituted circadian oscillator, the phosphorylation state of KaiC oscillates with a circadian period, spending about 12 h in the phosphorylation phase and another 12 h in the dephosphorylation phase. Although some entrainment studies have been performed using the reconstituted oscillator, they were insufficient to fully explain entrainment mechanisms of the cyanobacterial circadian clock due to the lack of input pathway components in the in vitro oscillator reaction mixture. Here, we investigate how an

APA, Harvard, Vancouver, ISO, and other styles

9

Usanov, Dmitrij, Sergej Venig, and Sergey Skvortsov. "Magnetogcontrolled generation with period-adding sequence and chaos in the circuit with magnetotransistor." Izvestiya VUZ. Applied Nonlinear Dynamics 8, no. 5 (2001): 43–47. http://dx.doi.org/10.18500/0869-6632-2000-8-5-43-47.

Full text

Abstract:

Experimental investigation results of relaxation oscillator operation are presented, in which bipolar magnetotransistor is used аs one of transistors. Possibility of magnetocontrolled period—adding sequence initiation in such oscillator is shown, and the discrete variation of an oscillation period takes place with constant step for discrete values of magnetic field induction with an equal interval of its change. Mode of the oscillator operation is found, at which the transition from periodic oscillation through period—adding sequence to chaotic oscillation is characterized by high sluggishness

APA, Harvard, Vancouver, ISO, and other styles

10

Olshanskii, Vasiliy, and Stanislav Olshanskii. "Modeling the motion of an oscillator with a soft elastic characteristic." Physico-mathematical modelling and informational technologies, no. 25 (May 25, 2017): 113–24. http://dx.doi.org/10.15407/fmmit2017.25.113.

Full text

Abstract:

The free oscillations of a system with one degree of freedom are considered under the assumption that the elasticity of a spring is proportional to the cubic root of its deformation. Two forms of the analytical solution of the nonlinear differential equation of motion of the oscillator are obtained. In the first displacement of the oscillator in time is expressed in terms of incomplete elliptic integrals of the first and second kind. In the second form, the solution is expressed in terms of periodic Ateb-functions. The tables of the involved functions are made, which simplify the calculation.

APA, Harvard, Vancouver, ISO, and other styles

11

Bao, Weili, and Jian-Young Wu. "Propagating Wave and Irregular Dynamics: Spatiotemporal Patterns of Cholinergic Theta Oscillations in Neocortex In Vitro." Journal of Neurophysiology 90, no. 1 (2003): 333–41. http://dx.doi.org/10.1152/jn.00715.2002.

Full text

Abstract:

Neocortical “theta” oscillation (5–12 Hz) has been observed in animals and human subjects but little is known about how the oscillation is organized in the cortical intrinsic networks. Here we use voltage-sensitive dye and optical imaging to study a carbachol/bicuculline induced theta (∼8 Hz) oscillation in rat neocortical slices. The imaging has large signal-to-noise ratio, allowing us to map the phase distribution over the neocortical tissue during the oscillation. The oscillation was organized as spontaneous epochs and each epoch was composed of a “first spike,” a “regular” period (with rel

APA, Harvard, Vancouver, ISO, and other styles

12

Sneyd, James, Jung Min Han, Liwei Wang, et al. "On the dynamical structure of calcium oscillations." Proceedings of the National Academy of Sciences 114, no. 7 (2017): 1456–61. http://dx.doi.org/10.1073/pnas.1614613114.

Full text

Abstract:

Oscillations in the concentration of free cytosolic Ca2+ are an important and ubiquitous control mechanism in many cell types. It is thus correspondingly important to understand the mechanisms that underlie the control of these oscillations and how their period is determined. We show that Class I Ca2+ oscillations (i.e., oscillations that can occur at a constant concentration of inositol trisphosphate) have a common dynamical structure, irrespective of the oscillation period. This commonality allows the construction of a simple canonical model that incorporates this underlying dynamical behavi

APA, Harvard, Vancouver, ISO, and other styles

13

Chang, Pao-Liang, Wei-Ting Fang, Pin-Fang Lin, and Yu-Shuang Tang. "Influence of Wind-Induced Antenna Oscillations on Radar Observations and Its Mitigation." Weather and Forecasting 35, no. 6 (2020): 2235–54. http://dx.doi.org/10.1175/waf-d-20-0064.1.

Full text

Abstract:

AbstractAs Typhoon Goni (2015) passed over Ishigaki Island, a maximum gust speed of 71 m s−1 was observed by a surface weather station. During Typhoon Goni’s passage, mountaintop radar recorded antenna elevation angle oscillations, with a maximum amplitude of ~0.2° at an elevation angle of 0.2°. This oscillation phenomenon was reflected in the reflectivity and Doppler velocity fields as Typhoon Goni’s eyewall encompassed Ishigaki Island. The main antenna oscillation period was approximately 0.21–0.38 s under an antenna rotational speed of ~4 rpm. The estimated fundamental vibration period of t

APA, Harvard, Vancouver, ISO, and other styles

14

Hocke, K., S. Studer, O. Martius, D. Scheiben, and N. Kämpfer. "A 20-day period standing oscillation in the northern winter stratosphere." Annales Geophysicae 31, no. 4 (2013): 755–64. http://dx.doi.org/10.5194/angeo-31-755-2013.

Full text

Abstract:

Abstract. Observations of the ozone profile by a ground-based microwave radiometer in Switzerland indicate a dominant 20-day oscillation in stratospheric ozone, possibly related to oscillations of the polar vortex edge during winter. For further understanding of the nature of the 20-day oscillation, the ozone data set of ERA Interim meteorological reanalysis is analyzed at the latitude belt of 47.5° N and in the time from 1979 to 2010. Spectral analysis of ozone time series at 7 hPa indicates that the 20-day oscillation is maximal at two locations: 7.5° E, 47.5° N and 60° E, 47.5° N. Composite

APA, Harvard, Vancouver, ISO, and other styles

15

Darelius, E., I. Fer, T. Rasmussen, C. Guo, and K. M. H. Larsen. "On the modulation of the periodicity of the Faroe Bank Channel overflow instabilities." Ocean Science Discussions 12, no. 3 (2015): 823–61. http://dx.doi.org/10.5194/osd-12-823-2015.

Full text

Abstract:

Abstract. The Faroe Bank Channel (FBC) is one of the major pathways where dense, cold water formed in the Nordic Seas flows southward towards the north Atlantic. The plume region downstream of the FBC sill is characterized by high mesoscale variability, quasi-regular oscillations and intense mixing. Here, one year-long time series of velocity and temperature from eight moorings deployed in May 2012 in the plume region is analyzed to describe variability in the strength and period of the oscillations. The eddy kinetic energy (EKE) associated with the oscillations is modulated with a factor of t

APA, Harvard, Vancouver, ISO, and other styles

16

Ševčík, Peter, and Ľubica Adamčíková. "Bromine and period of Belousov-Zhabotinskii type oscillation reaction." Collection of Czechoslovak Chemical Communications 50, no. 4 (1985): 799–805. http://dx.doi.org/10.1135/cccc19850799.

Full text

Abstract:

Belousov-Zhabotinskii type oscillation reaction with oxalic acid proceeds in a closed system, in a flow-through open system, as well as under intermediate conditions. Oscillations are started in either of the following three ways: 1) Increasing the removal of bromine from solution by bubbling inert gases, 2) chemically, and 3) in a flow-through reactor. The oscillation period is largely dependent on the removal rate of bromine, other reactant concentrations being constant.

APA, Harvard, Vancouver, ISO, and other styles

17

Yang, Dandan, Yanfeng Gao, Ming Yu, Xiaoping Wen, and Ming-Xiang Zhao. "Analysis of drag reduction effects in turbulent Taylor–Couette flow controlled via axial oscillation of inner cylinder." Physics of Fluids 34, no. 4 (2022): 045111. http://dx.doi.org/10.1063/5.0087966.

Full text

Abstract:

Analysis of drag reduction effects due to axial oscillation of an inner cylinder in a turbulent Taylor–Couette (TC) flow is performed in the present study. The frictional Reynolds number on the inner cylinder is 218, and the non-dimensional oscillating period is varied from 8 to 32. By examining turbulence statistics, we uncover different impacts of the long- and short-period oscillations on the circumferential ( θ) and radial ( r) velocity fluctuations in large ([Formula: see text]) and small ([Formula: see text]) scales. One of the most surprising findings is that the short-period oscillatio

APA, Harvard, Vancouver, ISO, and other styles

18

Cowley, S. W. H., and G. Provan. "Planetary period oscillations in Saturn's magnetosphere: comments on the relation between post-equinox periods determined from magnetic field and SKR emission data." Annales Geophysicae 33, no. 7 (2015): 901–12. http://dx.doi.org/10.5194/angeo-33-901-2015.

Full text

Abstract:

Abstract. We discuss the properties of Saturn planetary period oscillations (PPOs) deduced from analysis of Saturn kilometric radiation (SKR) modulations by Fischer et al. (2014), and from prior analysis of magnetic field oscillations data by Andrews et al. (2012) and Provan et al. (2013), with emphasis on the post-equinox interval from early 2010 to early 2013. Fischer et al. (2014) characterize this interval as showing single phase-locked periods in the northern and southern SKR modulations observed in polarization-separated data, while the magnetic data generally show the presence of separa

APA, Harvard, Vancouver, ISO, and other styles

19

SCHUSTER, STEFAN, and MARKO MARHL. "BIFURCATION ANALYSIS OF CALCIUM OSCILLATIONS: TIME-SCALE SEPARATION, CANARDS, AND FREQUENCY LOWERING." Journal of Biological Systems 09, no. 04 (2001): 291–314. http://dx.doi.org/10.1142/s021833900100044x.

Full text

Abstract:

The behavior of calcium oscillations near bifurcations is analyzed for three different models. For the model developed by Somogyi and Stucki [42], it is shown that the range of oscillations is bounded by supercritical and subcritical Hopf bifurcations. Near the latter, canard orbits arise, that is, quasi-harmonic oscillations with a very small amplitude grow very fast to become pulsed oscillations. The potential biological significance of this behavior is discussed. A time-scale analysis of this model is performed and an approximation formula for the oscillation period is derived. For two mode

APA, Harvard, Vancouver, ISO, and other styles

20

Sangal, Kartika, A. K. Srivastava, P. Kayshap, Ding Yuan, and E. Scullion. "Statistical Investigation of Wave Propagation in the Quiet-Sun Using IRIS Spectroscopic Observations." Astrophysical Journal 966, no. 2 (2024): 187. http://dx.doi.org/10.3847/1538-4357/ad36ca.

Full text

Abstract:

Abstract In this analysis, we use spectroscopic observations of the quiet Sun made by the IRIS instrument and investigate wave propagation. We analyze various spectral lines formed in different atmospheric layers, such as the photosphere, chromosphere, and transition region. We examine the Doppler velocity time series at various locations in the quiet Sun to determine the dominant oscillation periods. Our results executing statistical analysis resemble those of the classical physical scenario, indicating that the photosphere is mainly characterized by the dominant 5 minute period, while the ch

APA, Harvard, Vancouver, ISO, and other styles

21

BELÉNDEZ, A., D. I. MÉNDEZ, M. L. ALVAREZ, C. PASCUAL, and T. BELÉNDEZ. "APPROXIMATE ANALYTICAL SOLUTIONS FOR THE RELATIVISTIC OSCILLATOR USING A LINEARIZED HARMONIC BALANCE METHOD." International Journal of Modern Physics B 23, no. 04 (2009): 521–36. http://dx.doi.org/10.1142/s0217979209049954.

Full text

Abstract:

The analytical approximate technique developed by Wu et al. for conservative oscillators with odd nonlinearity is used to construct approximate frequency-amplitude relations and periodic solutions to the relativistic oscillator. By combining Newton's method with the method of harmonic balance, analytical approximations to the oscillation period and periodic solutions are constructed for this oscillator. The approximate periods obtained are valid for the complete range of oscillation amplitudes, A, and the discrepancy between the second approximate period and the exact one never exceeds 1.24%,

APA, Harvard, Vancouver, ISO, and other styles

22

Darelius, E., I. Fer, T. Rasmussen, C. Guo, and K. M. H. Larsen. "On the modulation of the periodicity of the Faroe Bank Channel overflow instabilities." Ocean Science 11, no. 5 (2015): 855–71. http://dx.doi.org/10.5194/os-11-855-2015.

Full text

Abstract:

Abstract. The Faroe Bank Channel (FBC) is one of the major pathways where dense, cold water formed in the Nordic Seas flows southward as a bottom-attached energetic plume towards the North Atlantic. The plume region downstream of the FBC sill is characterized by high mesoscale variability, quasi-regular oscillations and intense mixing. Here, 1 year long time series of velocity and temperature from ten moorings deployed in May 2012 in the plume region are analysed to describe variability in the strength and period of the oscillations. The eddy kinetic energy (EKE) associated with the oscillatio

APA, Harvard, Vancouver, ISO, and other styles

23

Pattiaratchi, Charitha, and Sarath Wijeratne. "PROCESSES LEADING TO INFRA-GRAVITY PERIOD OSCILLATIONS AND CURRENTS IN PORTS AND MARINAS." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 78. http://dx.doi.org/10.9753/icce.v36.currents.78.

Full text

Abstract:

In this paper, we take the broad definition of tsunami (â€˜harbour waveâ€™) to describe oscillations in the infragravity (IG) periods (between 30 and 300s) in ports and marinas that often lead to interruption in harbour operations due to excessive vessel movements. The main processes that lead to these oscillations (also called seiches) are examined through the analysis of field measurements of water levels and currents from Western Australia. In a port or marina with lengths of the order of 500m and depths of the order of 10m, the natural oscillation periods are of the order of a few minutes.

APA, Harvard, Vancouver, ISO, and other styles

24

Asano, Toshiyuki, Toru Yamashiro, and Taro Kakinuma. "FIELD OBSERVATIONS OF SEICHE EVENTS IN A T-SHAPE BAY." Coastal Engineering Proceedings 1, no. 32 (2011): 38. http://dx.doi.org/10.9753/icce.v32.currents.38.

Full text

Abstract:

Field observations on secondary oscillations (seiche) in Urauchi Bay of Kami-koshiki Island, Japan were conducted during October 7-21, 2008. The seiches prone bay has a unique configuration as T-shape, which may cause the inherent characteristics of the eigen oscillations. The analyzed data show that the oscillations of the bay have at least two distinct modes; mode-1 oscillation of the period around 25 minutes with forming anti-nodes at the both inward inlets and possessing a node at the bay mouth, mode-2 oscillation of the period around 12 minutes which oscillates between the both inward inl

APA, Harvard, Vancouver, ISO, and other styles

25

Knizhnik, Kalman, Manuel Luna, Karin Muglach, Holly Gilbert, Therese Kucera, and Judith Karpen. "Observational Study of Large Amplitude Longitudinal Oscillations in a Solar Filament." Proceedings of the International Astronomical Union 8, S300 (2013): 428–29. http://dx.doi.org/10.1017/s174392131301140x.

Full text

Abstract:

AbstractOn 20 August 2010 an energetic disturbance triggered damped large-amplitude longitudinal (LAL) oscillations in almost an entire filament. In the present work we analyze this periodic motion in the filament to characterize the damping and restoring mechanism of the oscillation. Our method involves placing slits along the axis of the filament at different angles with respect to the spine of the filament, finding the angle at which the oscillation is clearest, and fitting the resulting oscillation pattern to decaying sinusoidal and Bessel functions. These functions represent the equations

APA, Harvard, Vancouver, ISO, and other styles

26

Tozzi, J. T., and C. H. von Kerczek. "The Stability of Oscillatory Hagen-Poiseuille Flow." Journal of Applied Mechanics 53, no. 1 (1986): 187–92. http://dx.doi.org/10.1115/1.3171709.

Full text

Abstract:

The linear stability theory of the nonzero mean, sinusoidally oscillating flow in a tube of circular cross section is examined. It is found that the relevant axisymmetric disturbances in the oscillatory flow are more stable (i.e., have larger decay rates) than the axisymmetric disturbances of the mean flow alone. This result holds for values of the cross-sectional average oscillation velocity amplitude at least as large as seven-tenths the average mean-flow velocity amplitude. Although the instantaneous velocity profile contains generalized inflection rings for a substantial portion of the osc

APA, Harvard, Vancouver, ISO, and other styles

27

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

28

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

29

ZHANG, JIANXIN, XIAODONG CHEN, and ANTHONY C. DAVIES. "LOOP GAIN AND ITS RELATION TO NONLINEAR BEHAVIOR AND CHAOS IN A TRANSFORMER-COUPLED OSCILLATOR." International Journal of Bifurcation and Chaos 14, no. 07 (2004): 2503–12. http://dx.doi.org/10.1142/s0218127404010783.

Full text

Abstract:

A relationship between the loop gain and nonlinear behavior of a transformer-coupled oscillator is established in this paper. With increase of the loop gain, the system undergoes a series of changes in its dynamical behavior, i.e. no oscillation, near-sinusoidal, period-doubling, chaotic and squegging oscillations. It is expected that the approach of loop gain analysis can be universally applied to investigating the nonlinear behavior, especially chaos, in other oscillators.

APA, Harvard, Vancouver, ISO, and other styles

30

Leontini, Justin S., David Lo Jacono, and Mark C. Thompson. "A numerical study of an inline oscillating cylinder in a free stream." Journal of Fluid Mechanics 688 (November 3, 2011): 551–68. http://dx.doi.org/10.1017/jfm.2011.403.

Full text

Abstract:

AbstractSimulations of a cylinder undergoing externally controlled sinusoidal oscillations in the free stream direction have been performed. The frequency of oscillation was kept equal to the vortex shedding frequency from a fixed cylinder, while the amplitude of oscillation was varied, and the response of the flow measured. With varying amplitude, a rich series of dynamic responses was recorded. With increasing amplitude, these states included wakes similar to the Kármán vortex street, quasiperiodic oscillations interleaved with regions of synchronized periodicity (periodic on multiple oscill

APA, Harvard, Vancouver, ISO, and other styles

31

Qian, S. B., L. Liu, and L. Y. Zhu. "Complex Period Variations of the Neglected W UMa-type Binary System NY Lyrae." Publications of the Astronomical Society of Australia 26, no. 1 (2009): 7–10. http://dx.doi.org/10.1071/as08009.

Full text

Abstract:

AbstractOrbital-period variations of the neglected W UMa-type binary star, NY Lyr, were analyzed based on two newly determined eclipse times together with the others compiled from the literature. A cyclic oscillation with a period of 82.1 yr and an amplitude of 0.0247 d was discovered to be superimposed on a continuous period increase (dP/dt = +1.33 × 10−7 d yr−1). After the long-term period increase and the large-amplitude cyclic oscillation were removed from the O–C diagram, the residuals suggest that there is another small-amplitude period oscillation (A4 = 0.0053 d, P4 = 19.4 years) in the

APA, Harvard, Vancouver, ISO, and other styles

32

Kravchuk, V. A. "Free oscillations of steel beams prestressed by wall stretching." Вестник гражданских инженеров 17, no. 6 (2020): 97–103. http://dx.doi.org/10.23968/1999-5571-2020-17-6-97-103.

Full text

Abstract:

The article presents the study results of the impact of steel beam prestressing by wall stretching on changes in the circular frequency, frequency, period, and number of oscillations per minute for free oscillation, and for oscillation taking into account the resistance forces. The forced oscillations of the beam under impulse loading are investigated. There has been carried out a comparative analysis of the dynamic parameters of prestressed beams and conventional beams of equal cross-section with the same load-bearing capacity parameters. The analysis results of the influence of resistance fo

APA, Harvard, Vancouver, ISO, and other styles

33

Nakariakov, Valery M., Yu Zhong, and Dmitrii Y. Kolotkov. "Transition from decaying to decayless kink oscillations of solar coronal loops." Monthly Notices of the Royal Astronomical Society 531, no. 4 (2024): 4611–18. http://dx.doi.org/10.1093/mnras/stae1483.

Full text

Abstract:

ABSTRACT The transition of an impulsively excited kink oscillation of a solar coronal loop to an oscillation with a stationary amplitude, i.e. the damping pattern, is determined using the low-dimensional self-oscillation model. In the model, the decayless kink oscillations are sustained by the interaction of the oscillating loop with an external quasi-steady flow. The analytical solution is based on the assumption that the combined effect of the effective dissipation, for example, by resonant absorption, and interaction with an external flow, is weak. The effect is characterized by a dimension

APA, Harvard, Vancouver, ISO, and other styles

34

Nakariakov, Valery M., and Dmitrii Y. Kolotkov. "Magnetohydrodynamic Waves in the Solar Corona." Annual Review of Astronomy and Astrophysics 58, no. 1 (2020): 441–81. http://dx.doi.org/10.1146/annurev-astro-032320-042940.

Full text

Abstract:

The corona of the Sun is a unique environment in which magnetohydrodynamic (MHD) waves, one of the fundamental processes of plasma astrophysics, are open to a direct study. There is striking progress in both observational and theoretical research of MHD wave processes in the corona, with the main recent achievements summarized as follows: ▪ Both periods and wavelengths of the principal MHD modes of coronal plasma structures, such as kink, slow and sausage modes, are confidently resolved. ▪ Scalings of various parameters of detected waves and waveguiding plasma structures allow for the validati

APA, Harvard, Vancouver, ISO, and other styles

35

Hampson, John, and Peter Haynes. "Phase Alignment of the Tropical Stratospheric QBO in the Annual Cycle." Journal of the Atmospheric Sciences 61, no. 21 (2004): 2627–37. http://dx.doi.org/10.1175/jas3276.1.

Full text

Abstract:

Abstract This paper investigates the occurrence of phase alignment of the tropical stratospheric quasi-biennial oscillation (QBO) with the annual cycle. First, updating previous studies, observational results are shown for NCEP reanalysis data and Singapore radiosondes: both datasets show strong phase alignment of the QBO at 24.5 km. Phase alignment is investigated in a 3D mechanistic stratospheric model including explicit large-scale planetary waves, forced by a lower boundary geopotential anomaly, and a simple equatorial wave parameterization. The model simulates a QBO-like oscillation, with

APA, Harvard, Vancouver, ISO, and other styles

36

Karpova, N. V., L. N. Petrova, and G. M. Shved. "Statistical study of seismic and ground pressure oscillations with steady frequencies in the 0.7–5 h period range." Annales Geophysicae 20, no. 6 (2002): 823–33. http://dx.doi.org/10.5194/angeo-20-823-2002.

Full text

Abstract:

Abstract. Product spectra of ground pressure variation and seismic oscillations have been calculated in the period sub-ranges of 42–90 min and 2.5–5 h, based on synchronous, co-located microbarograph and seismograph measurements at St. Petersburg (60° N, 30° E). The 200 records of 2–3.5 days in length and a combined duration of 525 days have been used. The product spectra have been computed for winter, spring, summer, and autumn, both individually and in combination. The spectra of different seasons are distinct from each other for both microbarograph and seismograph measurements; this can be

APA, Harvard, Vancouver, ISO, and other styles

37

REN, XIU-BIN, and XIANG-YUN GUO. "INFLUENCE OF THE REACTION TEMPERATURE ON THE OSCILLATORY BEHAVIOR DURING PARTIAL OXIDATION OF METHANE." Surface Review and Letters 15, no. 06 (2008): 769–74. http://dx.doi.org/10.1142/s0218625x0801213x.

Full text

Abstract:

The oscillatory behavior during partial oxidation of methane was studied by the Monte Carlo simulation with Langmuir–Hinshelwood mechanism and oxide formation and removal. The well-developed reaction rate oscillations can be observed when the CH 4 adsorption probability varies in a small window. The oscillation window is very sensitive to the variation of reaction temperature. When the temperature increases, the window for sustained oscillation becomes narrow and has an obvious shift. In the meantime, the oscillation period tends to become small and the amplitude decreases. When the temperatur

APA, Harvard, Vancouver, ISO, and other styles

38

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

39

Mashnich, G. P., and V. S. Bashkirtsev. "Latitudinal Variations of Line-of-Sight Velocity Oscillations in the Photosphere, Chromosphere and Prominences." International Astronomical Union Colloquium 167 (1998): 131–34. http://dx.doi.org/10.1017/s0252921100047448.

Full text

Abstract:

AbstractBy studying line-of-sight velocity time variations in prominences, we found that velocity oscillations with a period over 40 min have a reasonably well-marked dependence of the period length with heliolatitude. Simultaneous observations of line-of-sight velocities in the photosphere and chromosphere showed that quasi-hourly oscillation periods at these levels in the solar atmosphere and in prominences have a similar latitudinal behavior.

APA, Harvard, Vancouver, ISO, and other styles

40

Chou, H. F., N. Berman, and E. Ipp. "Oscillations of lactate released from islets of Langerhans: evidence for oscillatory glycolysis in beta-cells." American Journal of Physiology-Endocrinology and Metabolism 262, no. 6 (1992): E800—E805. http://dx.doi.org/10.1152/ajpendo.1992.262.6.e800.

Full text

Abstract:

Oscillations in the glycolytic process have been demonstrated in a number of different biological systems. However, their presence has never been demonstrated in insulin-secreting beta-cells. We used lactate as a marker for glycolysis and measured lactate and insulin concentrations in the effluent of isolated perifused rat islets of Langerhans. Sustained regular oscillations in lactate concentrations with an average period of 16-20 min were observed in islets that were perifused with medium containing 5.5 or 16.7 mM glucose. Sustained oscillations of insulin concentrations secreted by the isle

APA, Harvard, Vancouver, ISO, and other styles

41

Jacobi, Ch, N. Samtleben, and G. Stober. "Meteor radar observations of mesopause region long-period temperature oscillations." Advances in Radio Science 14 (September 28, 2016): 169–74. http://dx.doi.org/10.5194/ars-14-169-2016.

Full text

Abstract:

Abstract. Meteor radar observations of mesosphere/lower thermosphere (MLT) daily temperatures have been performed at Collm, Germany since August 2004. The data have been analyzed with respect to long-period oscillations at time scales of 2–30 days. The results reveal that oscillations with periods of up to 6 days are more frequently observed during summer, while those with longer periods have larger amplitudes during winter. The oscillations may be considered as the signature of planetary waves. The results are compared with analyses from radar wind measurements. Moreover, the temperature osci

APA, Harvard, Vancouver, ISO, and other styles

42

Bianchini, A., M. Friedjung, and W. Brinkmann. "New Results About Post Optical Maximum Oscillations of Novae." International Astronomical Union Colloquium 122 (1990): 155–56. http://dx.doi.org/10.1017/s0252921100068482.

Full text

Abstract:

AbstractNew results presented include the oscillations of intervals between maxima of light oscillations, while in the case of GK Per the Orion system velocities oscillated with twice the light oscillation period.

APA, Harvard, Vancouver, ISO, and other styles

43

Kontomaris, Stylianos Vasileios, Anna Malamou, Ioannis Psychogios, and Gamal M. Ismail. "Modified Ji-Huan He’s Frequency Formulation for Large-Amplitude Electron Plasma Oscillations." Atoms 12, no. 12 (2024): 68. https://doi.org/10.3390/atoms12120068.

Full text

Abstract:

This paper examines oscillations governed by the generic nonlinear differential equation u″=ωp021−u∓2β2uγ, where ωp0, β and γ are positive constants. The aforementioned differential equation is of particular importance, as it describes electron plasma oscillations influenced by temperature effects and large oscillation amplitudes. Since no analytical solution exists for the oscillation period in terms of ωp0, β,γ and the oscillation amplitude, accurate approximations are derived. A modified He’s approach is used to account for the non-symmetrical oscillation around the equilibrium position. Th

APA, Harvard, Vancouver, ISO, and other styles

44

Sharma, Vijay Kumar, Tom Kristian Bardal, and Anders Johnsson. "Light-Dependent Changes in the Leaflet Movement Rhythm of the Plant Desmodium gyrans." Zeitschrift für Naturforschung C 58, no. 1-2 (2003): 81–86. http://dx.doi.org/10.1515/znc-2003-1-215.

Full text

Abstract:

The movements of the lateral leaflets of the Indian telegraph plant Desmodium gyrans (L. F.) DC, have earlier been studied in detail with regards to the effects of chemicals, DC currents, and static magnetic fields. In the present paper we have discussed the oscillation of the lateral leaflets under the influence of white light of various light levels (0-75 μmol · m-2 · s-1), produced by an array of LEDs (light emitting diodes). LEDs were used in contrast to fluorescense tubes as in earlier studies in order to minimize changes of wavelength when light intensity was decreased or increased. Furt

APA, Harvard, Vancouver, ISO, and other styles

45

Shi, Laishun, Xiaomei Wang, Na Li, Jie Liu, and Chunying Yan. "Chlorine Dioxide-Iodide-Methyl Acetoacetate Oscillation Reaction Investigated by UV-Vis and Online FTIR Spectrophotometric Method." Scientific World Journal 2012 (2012): 1–9. http://dx.doi.org/10.1100/2012/918620.

Full text

Abstract:

In order to study the chemical oscillatory behavior and mechanism of a new chlorine dioxide-iodide ion-methyl acetoacetate reaction system, a series of experiments were done by using UV-Vis and online FTIR spectrophotometric method. The initial concentrations of methyl acetoacetate, chlorine dioxide, potassium iodide, and sulfuric acid and the pH value have great influence on the oscillation observed at wavelength of 289 nm. There is a preoscillatory or induction period, and the amplitude and the number of oscillations are associated with the initial concentration of reactants. The equations f

APA, Harvard, Vancouver, ISO, and other styles

46

Ayassou, Koffi, Andrea Pazmiño, Kokou Sabi, Ariane Bazureau, and Sophie Godin-Beekmann. "Evolution of Ozone above Togo during the 1979–2020 Period." Atmosphere 13, no. 12 (2022): 2066. http://dx.doi.org/10.3390/atmos13122066.

Full text

Abstract:

The objective of this paper is to estimate the trend of the Total Ozone Column (TOC) over Togo. A Multi-Sensor Reanalysis-2 (MSR-2) of the TOC over the entire territory of Togo was used. A Multiple Linear Regression (MLR) method has been applied to retrieve the interannual contributions of different forcings and the long-term variability. It was found that the Annual Oscillation (AnO), the Quasi Biennial Oscillation at 30 mb (QBO30), the Solar Flux (SF), and the El Niño–Southern Oscillation (ENSO) has a statistically significant influence on the interannual variability of the TOC. The stronges

APA, Harvard, Vancouver, ISO, and other styles

47

Shao, Xiao Yi, Ying Chang Wang, and Xi Chun Xing. "Detection of Earth’s Free Oscillations Stimulated by the Mw8.3 Okhotsk Sea Earthquake in 2013 Based on Observational Data of Water-Tube Tiltmeters in Shaanxi Province." Applied Mechanics and Materials 568-570 (June 2014): 198–202. http://dx.doi.org/10.4028/www.scientific.net/amm.568-570.198.

Full text

Abstract:

Using power spectrum density estimation method, analyzed the digital observational data of water-tube tiltmeters of Shaanxi deformation monitoring network in 6 seismic stations as QL, HZ, HY, BJ, XA and NQ, which detected the earth’s free oscillations stimulated by the Mw8.3 Okhotsk Sea Earthquake in May 24th, 2013. The results show that radical shock of spherical oscillation (0S05~0S32), harmonic spherical oscillation (3S01, 1S04, 2S04, 1S06) and toroidal oscillations (0T05~0T09) are detected effectively. Comparing the period of the extracted oscillation with that the theoretical oscillation

APA, Harvard, Vancouver, ISO, and other styles

48

Kravchenko, V. O., O. M. Evtushevsky, A. V. Grytsai, and G. P. Milinevsky. "Decadal variability of winter temperatures in the Antarctic Peninsula region." Antarctic Science 23, no. 6 (2011): 614–22. http://dx.doi.org/10.1017/s0954102011000423.

Full text

Abstract:

AbstractRapid climate warming has been observed in the region of the Antarctic Peninsula since the middle of the last century with the largest warming rate in the winter. Decadal variability of winter temperature on the regional scale was analysed using eight station datasets of the Antarctic Peninsula region. The Scientific Committee on Antarctic Research Reference Antarctic Data for Environmental Research from the period 1950–2009 were used. Fourier and wavelet transforms of the averaged temperature anomaly time series reveal a clear separation between the oscillations with three to eight ye

APA, Harvard, Vancouver, ISO, and other styles

49

Krive, I. V., and A. S. Rozhavskii. "Coherent charge fluctuations in Josephson junctions and effective capacitance oscillations." Soviet Journal of Low Temperature Physics 17, no. 2 (1991): 89–91. https://doi.org/10.1063/10.0032779.

Full text

Abstract:

A new effect of macroscopic coherent 2e-charge fluctuations leading to voltage oscillations of the effective capacitance is predicted for small Josephson junctions. The oscillation period is Vc = 2e/C (C is the total capacitance of the junction), and the oscillation amplitude decreases rapidly with increasing temperature as exp (−π2T/Ec), where Ec = (2e)2/2C.

APA, Harvard, Vancouver, ISO, and other styles

50

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!