Results 51 to 60 of about 93,288 (302)

Opening the air‐chamber of an oscillating water column spar buoy wave energy converter to avoid parametric resonance

IET Renewable Power Generation, 2021
The oscillating‐water‐column (OWC) spar‐buoy is a type of wave energy converter that may exhibit undesirable large roll and pitch amplitudes caused by a dynamic instability induced by parametric resonance.
Josh Davidson, João C. C. Henriques, Rui P. F. Gomes, Roberto Galeazzi   +3 more
doaj   +1 more source

Parametric and Autoparametric Resonance

Acta Applicandae Mathematica, 2002
The author explains the linear and nonlinear dynamics of parametric systems by applying normal form techniques and bifurcation results. Illustrations in rotor dynamics, autoparametric resonance of a parametric oscillator and autoparametric resonance of a self-excited oscillator are provided showing the role of bifurcation, symmetry and attraction to ...
openaire   +4 more sources

Heterogeneity in the Global Practice of Central Nervous System Staging in Pediatric Acute Lymphoblastic Leukemia

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Central nervous system (CNS) involvement in childhood acute lymphoblastic leukemia (ALL) is assessed by cell counting and cytomorphology from cerebrospinal fluid (CSF) and is used for treatment stratification worldwide. The ratio of “CNS2” patients in clinical trials ranges from 3% to 40%, with unclear prognostic significance ...
Laura Almási, Bernadett Borbála Huszti, Gábor Barna, Marko Kavcic, Janez Jazbec, Lennart Lenk, Vera Münch, Sophia Polychronopoulou, Ágnes Márk, Maria Thastrup, Lüder H. Meyer, Kjeld Schmiegelow, Cornelia Eckert, Christina Halsey, Dániel J. Erdélyi   +14 more
wiley   +1 more source

Stochastic parametric resonance in shear flows [PDF]

Nonlinear Processes in Geophysics, 2005
Time-periodic shear flows can give rise to Parametric Instability (PI), as in the case of the Mathieu equation (Stoker, 1950; Nayfeh and Mook, 1995).
F. J. Poulin, M. Scott
doaj  

The Effect of Mooring Line Parameters in Inducing Parametric Resonance on the Spar-Buoy Oscillating Water Column Wave Energy Converter

Journal of Marine Science and Engineering, 2020
Although it is widely accepted that accurate modeling of wave energy converters is essential for effective and reliable design, it is often challenging to define an accurate model which is also fast enough to investigate the design space or to perform ...
Giuseppe Giorgi, Rui P. F. Gomes, Giovanni Bracco, Giuliana Mattiazzo   +3 more
doaj   +1 more source

Non-degenerate parametric resonance in tunable superconducting cavity [PDF]

, 2017
We develop a theory for non-degenerate parametric resonance in a tunable superconducting cavity. We focus on nonlinear effects that are caused by nonlinear Josephson elements connected to the cavity.
W. Wustmann, V. Shumeiko
semanticscholar   +1 more source

Therapeutic Apheresis for Intravenous Methylprednisolone‐Refractory Neuromyelitis Optica Spectrum Disorder: Clinical and Radiological Outcomes in a Single‐Center Case Series

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Neuromyelitis optica spectrum disorder (NMOSD) is a relapsing autoimmune disease of the central nervous system. High‐dose intravenous methylprednisolone (IVMP) is the standard first‐line therapy for acute attacks, although some patients remain refractory.
Wataru Horiguchi, Daisuke Katagiri, Takeyuki Watadani, Shunichi Matsuda, Hiroshi Kaneko, Noritoshi Arai   +5 more
wiley   +1 more source

Parametric resonance in concrete beam-columns

Latin American Journal of Solids and Structures
A dynamic instability, called parametric resonance, is exhibited by undampedelastic beam-columns when under the action of pulsating axial force. The scope of the existing theory of parametric resonance is restricted to physically linear beam-columns ...
Mamta R. Sharma, Arbind K. Singh, Gurmail S. Benipal   +2 more
doaj   +1 more source

Parametric resonance in the ultracold Rydberg plasma under the influence of an acoustic wave

Геофизический журнал, 2020
The article considers weakly ionized ultracold Rydberg plasma under the influence of an acoustic wave of the terahertz range. The effect of an acoustic wave on Langmuir oscillations of Rydberg plasma is described using a hydrodynamic approach.
V.M. Rylyuk, L.M. Kuzmina, M.I. Skipa
doaj   +1 more source

The Instability and Response Studies of a Top-Tensioned Riser under Parametric Excitations Using the Differential Quadrature Method

Mathematics, 2022
The differential quadrature method (DQM) is a numerical technique widely applied in structure mechanics problems. In this work, a top-tensioned riser conveying fluid is considered.
Yang Zhang, Qiang Gui, Yuzheng Yang, Wei Li   +3 more
doaj   +1 more source