Results 251 to 260 of about 359,409 (274)
Some of the next articles are maybe not open access.
Ferumoxytol-enhanced vascular suppression in magnetic resonance neurography
Skeletal Radiology, 2021To evaluate ferumoxytol-enhanced vascular suppression for visualizing branch nerves of the brachial plexus in magnetic resonance (MR) neurography.Signal simulations were performed to determine ferumoxytol's effect on nerve-, fat-, and blood-to-muscle contrast and to optimize pulse sequence parameters.
Sophie C, Queler +4 more
openaire +2 more sources
Suppression of chaos by resonant parametric perturbations
Physical Review A, 1990Starting from a chaotic regime in the dynamics of a Duffing-Holmes oscillator, we show how it is possible, by means of a small parametric perturbation of suitable frequency, to bring the system to a regular regime. This situation is studied from the analytic point of view using the Melnikov method and from the numerical point of view computing Lyapunov
, Lima, , Pettini
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Vibration Suppression of a Principal Parametric Resonance
Journal of Vibration and Control, 2009In this paper, a control method that combines linear and nonlinear-velocity feedback control is proposed to suppress the principal parametric resonance in a flexible cantilever beam structure. Linear-velocity feedback is employed for bifurcation control, and cubic-velocity feedback is employed to suppress high-amplitude vibration.
Sammut, Karl, He, Fangpo, Chen, Lei
openaire +3 more sources
Contrast resonance imaging with microbubble resonance enhancement and suppression
2008 IEEE Ultrasonics Symposium, 2008A new set of multiple-pulse contrast modalities with combinations of power modulation (PM), pulse inversion (PI) and contrast resonance (CR) are proposed in order for contrast imaging sensitivity improvement. For the CR mode, an imaging pulse is ldquoembeddedrdquo in a long ldquoresonancerdquo pulse so that the dynamic ldquoresonantrdquo state of a ...
William T. Shi +2 more
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Reverse wave suppression in unstable ring resonator
17th Fluid Dynamics, Plasma Dynamics, and Lasers Conference, 1984The effectiveness of a reverse wave suppressor (RWS) mirror in an unstable ring resonator has been investigated theoretically and experimentally for the case of an inhomogeneously broadened gain medium. The theory indicates that the RWS mirror is effective when (δ/Δνh)2 ≪ 1, where Δνh is the characteristic homogeneous linewidth of the gain medium and δ
H, Mirels +4 more
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Suppression of Rayleigh Backscattering in Resonators
2018 IEEE Photonics Conference (IPC), 2018We demonstrate dynamic suppression of Rayleigh backscattering in a whispering gallery mode resonator by locally breaking time-reversal symmetry through a Brillouin optomechanical interaction.
Seunghwi Kim +2 more
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Resonance Suppression on Nanoscale Viscoelasticity Measurement
Advanced Materials Research, 2012During the broadband viscoelasticity measurement process, when the frequency of the excitation force become high relative to the resonant frequency or the bandwidth of the instrument dynamics, the adverse instrument dynamics is motivated, which causes the cantilever resonance and generates large measurement errors in the measurement data. To solve this
Ping Xie, Lei Zhang, Qing Ze Zou
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Torsional resonance suppression via pida controller
2000 TENCON Proceedings. Intelligent Systems and Technologies for the New Millennium (Cat. No.00CH37119), 2000A servo motor driving a load through a long shaft or transmission system is widely used in industries. Such a system encounters performance degradation caused by non-homogeneous twist of the shaft. This phenomenon is referred to as torsional resonance.
Chatchai U-thaiwasin +3 more
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Vibration Mode Suppression in Micromechanical Resonators Using Embedded Anti- Resonating Structures
Journal of Microelectromechanical Systems, 2021This paper presents a technique for suppressing specific resonance modes of micromechanical resonators by mechanical means. In particular, attaching multiple miniaturized beam structures with properly designed dimensions acting as anti-resonating tuned mass dampers (TMD’s) to a micromechanical clamped-clamped beam (CC-beam) resonator based on a CMOS ...
Jia-Ren Liu +5 more
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Backscattering suppression in nonreciprocal ring resonators
AIP Conference Proceedings, 2010Faraday effect in ring resonators leads to the resonance splitting of clockwise and counter‐clockwise propagating modes. Thus the backscattering into counter propagating mode of the ring resonator due to the roughness or periodical corrugation of the ring side walls can be suppressed by the Faraday effect.
Alexander Yu. Petrov +4 more
openaire +1 more source