Results 21 to 30 of about 5,935 (237)

Forced oscillation of impulsive fractional partial differential equations

open access: yesPartial Differential Equations in Applied Mathematics, 2023
In this paper, we investigate the forced oscillation of impulsive fractional partial differential equations. Some sufficient conditions are established which guarantee that the oscillation of the solutions by applying the integral transformation ...
G.E. Chatzarakis, K. Logaarasi
doaj   +1 more source

Wind Tunnel Measurement Systems for Unsteady Aerodynamic Forces on Bluff Bodies: Review and New Perspective

open access: yesSensors, 2020
Wind tunnel tests have become one of the most effective ways to evaluate aerodynamics and aeroelasticity in bluff bodies. This paper has firstly overviewed the development of conventional wind tunnel test techniques, including high frequency base balance
Zengshun Chen   +3 more
doaj   +1 more source

Contrasting diagnosis performance of forced oscillation and spirometry in patients with rheumatoid arthritis and respiratory symptoms

open access: yesClinics, 2012
OBJECTIVES: Pulmonary involvement in rheumatoid arthritis is directly responsible for 10% to 20% of all mortality. The best way to improve the prognosis is early detection and treatment.
Alvaro Camilo Dias Faria   +4 more
doaj   +1 more source

Work-loop techniques for optimising nonlinear forced oscillators

open access: yesCoRR, 2022
Linear and nonlinear resonant states can be restrictive: they exist at particular discrete states in frequency and/or elasticity, under particular (e.g., simple-harmonic) waveforms. In forced oscillators, this restrictiveness is an obstacle to system design and control modulation: altering the system elasticity, or modulating the response, would both ...
Arion Pons, Tsevi Beatus
openaire   +2 more sources

Respiratory oscillometry and functional analyses in patients with idiopathic scoliosis

open access: yesBrazilian Journal of Medical and Biological Research, 2023
Scoliosis is a condition that affects the spine and causes chest rotation and trunk distortion. Individuals with severe deformities may experience dyspnea on exertion and develop respiratory failure.
C.M.S. Sousa   +5 more
doaj   +1 more source

Correlations between forced oscillation technique parameters and pulmonary densitovolumetry values in patients with acromegaly [PDF]

open access: yesBrazilian Journal of Medical and Biological Research, 2015
The aims of this study were to evaluate the forced oscillation technique (FOT) and pulmonary densitovolumetry in acromegalic patients and to examine the correlations between these findings.
G.B. Camilo   +7 more
doaj   +3 more sources

Interval Oscillation Criteria for Forced Second-Order Nonlinear Delay Dynamic Equations with Damping and Oscillatory Potential on Time Scales

open access: yesInternational Journal of Differential Equations, 2016
We are concerned with the interval oscillation of general type of forced second-order nonlinear dynamic equation with oscillatory potential of the form rtg1xt,xΔtΔ+p(t)g2(x(t),xΔ(t))xΔ(t)+q(t)f(x(τ(t)))=e(t), on a time scale T.
Hassan A. Agwa   +2 more
doaj   +1 more source

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