Gotowe bibliografie tematyczne / Low-modes asymmetries

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Gotowa bibliografia na temat „Low-modes asymmetries”

Autor: Grafiati

Data publikacji: 14 września 2024

Data aktualizacji: 31 lipca 2025

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Artykuły w czasopismach na temat "Low-modes asymmetries"

Chaplin, W. J., Y. Elsworth, G. R. Isaak, C. P. McLeod, B. A. Miller та R. New. "A Search for ℓ = 2 Asymmetries in Bison Data". Symposium - International Astronomical Union 185 (1998): 169–70. http://dx.doi.org/10.1017/s0074180900238527.

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An in-depth discussion of the analysis presented here can be found in an up-coming paper (Chaplin et al., 1997).The presence of a magnetic field will raise the degeneracy in ℓ of the resonant p-mode oscillations, via perturbations resulting from the Lorentz force. These degeneracyraising effects will give rise to asymmetric mode-multiplet structures. Both Gough & Thompson (1990). and Dziembowski & Goode (1997) have addressed the implications and potential complications that might result from such phenomena. Here, in an attempt to reveal the presence of an asymmetric frequency structure

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Philidet, J., K. Belkacem, H. G. Ludwig, R. Samadi, and C. Barban. "Velocity-intensity asymmetry reversal of solar radial p-modes." Astronomy & Astrophysics 644 (December 2020): A171. http://dx.doi.org/10.1051/0004-6361/202038222.

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The development of space-borne missions has significantly improved the quality of the measured spectra of solar-like oscillators. Their p-mode line profiles can now be resolved, and the asymmetries inferred for a variety of stars other than the Sun. However, it has been known for a long time that the asymmetries of solar p-modes are reversed between the velocity and the intensity spectra. Understanding the origin of this reversal is necessary in order to use asymmetries as a tool for seismic diagnosis. For stars other than the Sun, only the intensity power spectrum is sufficiently resolved to

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Regan, Marc A., and Krishnan Mahesh. "Adjoint sensitivity and optimal perturbations of the low-speed jet in cross-flow." Journal of Fluid Mechanics 877 (August 22, 2019): 330–72. http://dx.doi.org/10.1017/jfm.2019.582.

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The tri-global stability and sensitivity of the low-speed jet in cross-flow are studied using the adjoint equations and finite-time horizon optimal disturbance analysis at Reynolds number $Re=2000$, based on the average velocity at the jet exit, the jet nozzle exit diameter and the kinematic viscosity of the jet, for two jet-to-cross-flow velocity ratios $R=2$ and $4$. A novel capability is developed on unstructured grids and parallel platforms for this purpose. Asymmetric modes are more important to the overall dynamics at $R=4$, suggesting increased sensitivity to experimental asymmetries at

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Deheuvels, S., R. M. Ouazzani, and S. Basu. "Near-degeneracy effects on the frequencies of rotationally-split mixed modes in red giants." Astronomy & Astrophysics 605 (September 2017): A75. http://dx.doi.org/10.1051/0004-6361/201730786.

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Context. The Kepler space mission has made it possible to measure the rotational splittings of mixed modes in red giants, thereby providing an unprecedented opportunity to probe the internal rotation of these stars. Aims. Asymmetries have been detected in the rotational multiplets of several red giants. This is unexpected since all the red giants whose rotation profiles have been measured thus far are found to rotate slowly, and low rotation, in principle, produces symmetrical multiplets. Our aim here is to explain these asymmetries and find a way of exploiting them to probe the internal rotat

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Wilcox, R. S., L. R. Baylor, A. Bortolon, et al. "Pellet triggering of edge localized modes in low collisionality pedestals at DIII-D." Nuclear Fusion 62, no. 2 (2021): 026017. http://dx.doi.org/10.1088/1741-4326/ac3b8b.

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Abstract Edge localized modes (ELMs) are triggered using deuterium pellets injected into plasmas with ITER-relevant low collisionality pedestals, and the resulting peak ELM energy fluence is reduced by approximately 25%–50% relative to natural ELMs destabilized at similar pedestal pressures. Cryogenically frozen deuterium pellets are injected from the low-field side of the DIII-D tokamak at frequencies lower than the natural ELM frequency, and heat flux is measured by infrared cameras. Ideal MHD pedestal stability calculations show that without pellet injection, these low collisionality pedest

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Woo, K. M., R. Betti, C. A. Thomas, et al. "Analysis of core asymmetries in inertial confinement fusion implosions using three-dimensional hot-spot reconstruction." Physics of Plasmas 29, no. 8 (2022): 082705. http://dx.doi.org/10.1063/5.0102167.

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Three-dimensional effects play a crucial role during the hot-spot formation in inertial confinement fusion (ICF) implosions. A data analysis technique for 3D hot-spot reconstruction from experimental observables has been developed to characterize the effects of low modes on 3D hot-spot formations. In nuclear measurements, the effective flow direction, governed by the maximum eigenvalue in the velocity variance of apparent ion temperatures, has been found to agree with the measured hot-spot flows for implosions dominated by mode [Formula: see text]. Asymmetries in areal-density ( ρR) measuremen

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Dikpati, Mausumi, Bernadett Belucz, Robertus Erdélyi, Peter A. Gilman, Scott W. McIntosh, and Breno Raphaldini. "Magnetohydrodynamic Instabilities of Double Magnetic Bands in a Shallow-water Tachocline Model. II. Teleconnection Between High- and Low-latitude Bands and Across Equator." Astrophysical Journal 977, no. 1 (2024): 99. https://doi.org/10.3847/1538-4357/ad8b50.

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Abstract The “extended solar cycle” indicates that there are two deeply seated toroidal magnetic field bands in each hemisphere. Both bands migrate equatorward as a sunspot cycle progresses. Here, we examine the consequences of global MHD instability of this migrating double-band system in tachocline on the latitudinal structure of unstable modes, which are essentially MHD Rossby waves. We find that latitude-location, latitude-separation, and the amplitude of the bands strongly influence the latitudinal structure and growth rates of the unstable modes of both symmetries about the equator. Thes

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Bugnet, L., V. Prat, S. Mathis, et al. "Magnetic signatures on mixed-mode frequencies." Astronomy & Astrophysics 650 (June 2021): A53. http://dx.doi.org/10.1051/0004-6361/202039159.

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Context. The discovery of moderate differential rotation between the core and the envelope of evolved solar-like stars could be the signature of a strong magnetic field trapped inside the radiative interior. The population of intermediate-mass red giants presenting surprisingly low-amplitude mixed modes (i.e. oscillation modes that behave as acoustic modes in their external envelope and as gravity modes in their core) could also arise from the effect of an internal magnetic field. Indeed, stars more massive than about 1.1 solar masses are known to develop a convective core during their main se

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Alexander, D. E. "Wind tunnel studies of turns by flying dragonflies." Journal of Experimental Biology 122, no. 1 (1986): 81–98. http://dx.doi.org/10.1242/jeb.122.1.81.

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High-speed movies of dragonflies turning in flight on flexible tethers show that there are two distinct modes of turning. In the ‘conventional’ mode, dragonflies use left-right asymmetries in the wing stroke amplitude, and occasionally in the angle of attack, to produce more lift and thrust on one side than the other. This causes the animal to roll into a bank, so that the lift vector has a sideward component; this sideward component produces the turn, much as in an airplane. This type of turn is probably most useful during fast forward flight. The second mode of turning in the ‘yaw turn’. Yaw

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CAZACU, Emil, and Lucian PETRESCU. "ASPECTE CALITATIVE ȘI CANTITATIVE ALE FENOMENUL DE FEROREZONANȚĂ ÎN INSTALAȚIILE ELECTRICE DE JOASĂ TENSIUNE." "ACTUALITĂŢI ŞI PERSPECTIVE ÎN DOMENIUL MAŞINILOR ELECTRICE (ELECTRIC MACHINES, MATERIALS AND DRIVES - PRESENT AND TRENDS)" 2020, no. 1 (2021): 1–14. http://dx.doi.org/10.36801/apme.2020.1.8.

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The phenomenon of ferroresonance is generated by the interaction between nonlinear magnetic devices and capacitive elements in an electrical installation in which losses are reduced and which are constantly supplied by at least one energy source. Feroresonance is manifested by the appearance of overvoltages and overcurrents in the installation with strongly distorted waveforms. Also, the phenomenon is accompanied by other disturbances of the quality of electricity (voltage fluctuations, asymmetries, noise, etc.), which propagate in the network affecting the proper functioning of the entire ins

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Rozprawy doktorskie na temat "Low-modes asymmetries"

Viala, Diego. "Étude de la physique de l'allumage par choc." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0127.

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Une décennie d'expériences au "National Ignition Facility" a démontré que la fusion par confinement inertiel constitue une approche crédible pour la production d'énergie, avec des résultats allant au-delà du régime d'allumage. Cependant, l'approche par attaque indirecte se révèle inadéquate pour les implosions à gain élevé et une production d'énergie fiable. L'option d'allumage par attaque directe est privilégiée en raison de ses conceptions de cible plus simples et de son meilleur couplage énergétique. Actuellement, aucune installation laser à l'échelle d'allumage n'est configurée selon l'app

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Streszczenia konferencji na temat "Low-modes asymmetries"

Pray, Carl M., and Stephen A. Hambric. "Finite Element Study of Harmonic Forcing Function Scattering Mechanisms for Cylindrical Structures." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32686.

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Low frequency sound radiation from cylindrical structures is generally dominated by radiation from low order (M=0, 1) circumferential harmonic modes. The high order circumferential harmonic modes are inefficient radiators below the coincidence frequency. For cylindrical structures excited by low frequency, high circumferential order (e.g. N=10) forcing functions, the radiated sound will be dominated by radiation from the low order modes if the forcing function is scattered by structural asymmetries into these modes. In this study, cylindrical structures of varying levels of asymmetry are exami

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Colaitis, Arnaud, Igor Igumenschev, David Turnbull, et al. "3D Simulations of OMEGA Implosions in Presence of Low Mode Asymmetries: Systematic Flow Anomalies and Impact of Low Modes on Implosion Performance." In Proposed for presentation at the Matter and Radiation at Extremes Young Scientist Award Event held May 16-17, 2022 in Virtual, Virtual Virtual. US DOE, 2022. http://dx.doi.org/10.2172/2003267.

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Humbert, Sylvain C., Alessandro Orchini, Christian Oliver Paschereit, and Nicolas Noiray. "Symmetry Breaking in an Experimental Annular Combustor Model With Deterministic Electroacoustic Feedback and Stochastic Forcing." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-81729.

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Abstract In this study, we use an annular combustor experimental model with electroacoustic feedback to investigate systematically the effect of stochastic forcing and of non-uniform flame response distribution on azimuthal thermoacoustic modes. We break the symmetry of a nominally degenerate mode of azimuthal order m by imposing a non-zero 2m Fourier component of the flame gain, b2m, and of the time-delay, ε2m. Various orientations between the gain and the time-delay staging patterns are considered. In addition, stochastic forcing is introduced. First, all experiments are performed without no

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Darvishian, Ali, Behrouz Shiari, Jae Yoong Cho, and Khalil Najafi. "Effect of Imperfections on Fused Silica Shell Resonators." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39303.

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Axisymmetric shell resonators have been attractive candidates for high performance MEMS vibratory gyroscopes because of their high quality factor, low sensitivity to environmental vibrations and electrostatic tuning capability. Fused silica shell resonators made by blow torch molding with high quality factor could perform as high performance MEMS gyroscopes. Despite such advantageous features, the performance of these shell resonators is limited by geometric imperfections that occur during fabrication. This paper investigates effect of geometric asymmetries such as height and radius imperfecti

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O’Connor, Jacqueline, and Tim Lieuwen. "Influence of Transverse Acoustic Modal Structure on the Forced Response of a Swirling Nozzle Flow." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-70053.

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This study describes continued investigations of the response of a swirling flow to transverse acoustic excitation. This work is motivated by transverse combustion instabilities in annular gas turbine engine architectures. This instability provides a spatially varying acoustic velocity disturbance field around the annulus, so that different nozzles encounter different acoustic disturbance fields. In this study, we simulate this effect by looking at a standing wave acoustic field where the nozzle is located at either a velocity anti-node, referred to as out-of-phase forcing, and a velocity node

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Wang, Jing, Xin Hui, Hao Qin, Chi Zhang, and Yuzhen Lin. "Unsteady Heat Release of Stratified Swirling Flames in a Partially Premixed Pre-Vaporized Combustor." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57061.

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Unsteady heat release of stratified swirling flames in a partially premixed pre-vaporized combustor at elevated pressure and temperature is experimentally investigated. Stratified flames produced by a pilot swirler and a main one which are fueled by different flow rates of aviation kerosene. Three fuel staging ratios (SR) of 25%, 30%, and 35% are tested to study its effect on the heat release of stratified flame. CH* chemiluminescence emissions are recorded by a high speed ICCD camera with a 430±10 nm band-pass filter. The Proper Orthogonal Decomposition (POD) analysis is employed to identify

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Zhang, Huanyu, Xinliang Tian, Yakun Zhao, Xin Li, and Wenyue Lu. "Symmetry Breaking of a Rigid-Flexible Coupling System at Low Reynolds Numbers." In ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-102999.

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Abstract Flow past a rigid-flexible coupling system consisting of a rigid plate and a trailing closed flexible filament was simulated numerically. An immersed boundary method was developed based on OpenFOAM to solve this fluid-structure interaction (FSI) problem. Three simulations including flow past a rigid circular cylinder, a rigid plate, and two flexible loops were conducted to validate our code. The motion modes transition and dynamic performance of the coupling system were investigated at low Reynolds numbers (Re ≤ 80), where the tension coefficient and bending coefficient of the filamen

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Park, Jung Seo, I. Y. Shen, and C. P. Roger Ku. "Rocking Vibration of Rotating Disk and Spindle Systems With Asymmetric Bearings." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21566.

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Abstract This paper studies how bearing asymmetry affects natural frequencies and mode shapes of a rotating disk/spindle system through a numerical simulation and a perturbation analysis. Existing literature has shown that rocking motion of a rotating disk/spindle system with symmetric bearings consists of rigid body rocking of the spindle, one-nodal-diameter modes of each disk, and deformation of spindle bearings. The rocking motion, characterized by (0,1) unbalanced modes, has repeated natural frequencies when the spindle is stationary, because the disk/spindle system is axisymmetric. For a

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Chiriac, Victor Adrian, and Alfonso Ortega. "Control of Convective Heat Transfer in a Confined Laminar Impinging Jet by Low Amplitude Forcing." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32909.

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A numerical finite-difference model, derived using a control-volume approach, was used to compute the flow and heat transfer characteristics in a two-dimensional confined laminar air jet impinging on an isothermal surface. Several cases were considered with Re=650, 750, and nozzle to plate spacing, H/W=5. The behavior of the jet and the attendant heat transfer from the target wall were investigated when the jet was forced by fluidic excitation at the nozzle exit. At Re between 585 and 610, the unforced jet exhibits a transition to an unsteady regime leading to asymmetric vortex shedding and je

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Barbosa Moreira, Alysson Bruno, and Fabrice Thouverez. "Influence of Blade Flexibility on the Dynamic Response Simulation of a Turbomolecular Pump on Magnetic Bearings." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90990.

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Abstract This paper proposes the simulation of a complete mechanical model of a turbomolecular pump rotor, including rotor and blades flexibility, suspended by controlled active magnetic bearings. The mechanical model is composed of an eight stage blisk, attached to a shaft. Magnetic forces are linearized by first order Taylor expansion around a given point. Including blades and rotor flexibility makes the mechanical system asymmetric, so the equations of motion for the coupled system have periodic terms. A modal controller was designed to control rigid body modes, since the number of sensors

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