Probing the pressure dependence of sound speed and attenuation in bubbly media: Experimental observations, a theoretical model and numerical calculations

AJ Sojahrood, Q Li, H Haghi, R Karshafian… - Ultrasonics …, 2023 - Elsevier
The problem of attenuation and sound speed of bubbly media has remained partially
unsolved. Comprehensive data regarding pressure-dependent changes of the attenuation …

Classification of the major nonlinear regimes of oscillations, oscillation properties, and mechanisms of wave energy dissipation in the nonlinear oscillations of coated …

AJ Sojahrood, H Haghi, R Karshafian, MC Kolios - Physics of Fluids, 2021 - pubs.aip.org
Acoustic waves are dissipated when they pass through bubbly media. Dissipation by
bubbles takes place through thermal damping (Td), radiation damping (Rd), and damping …

[HTML][HTML] Nonlinear dynamics and bifurcation structure of ultrasonically excited lipid coated microbubbles

AJ Sojahrood, H Haghi, R Karshafian… - Ultrasonics Sonochemistry, 2021 - Elsevier
In many applications, microbubbles (MBs) are encapsulated by a lipid coating to increase
their stability. However, the complex behavior of the lipid coating including buckling and …

[HTML][HTML] Investigation of the 1/2 order subharmonic emissions of the period-2 oscillations of an ultrasonically excited bubble

AJ Sojahrood, R Earl, MC Kolios, R Karshafian - Physics Letters A, 2020 - Elsevier
In this work, through applying a comprehensive bifurcation analysis method, we study the
nonlinear radial oscillations of the bubble oscillator. The frequency of the driving force is …

[HTML][HTML] Transition mechanisms of translational motions of bubbles in an ultrasonic field

X Wang, Z Ning, M Lv, P Wu, C Sun, Y Liu - Ultrasonics Sonochemistry, 2023 - Elsevier
The translation behaviors of oscillating bubbles are closely related to the polymerizations
and dispersions between them, which are crucial for the ultrasonic cavitation effect. In this …

[HTML][HTML] The art of solving a large number of non-stiff, low-dimensional ordinary differential equation systems on GPUs and CPUs

D Nagy, L Plavecz, F Hegedűs - Communications in Nonlinear Science and …, 2022 - Elsevier
This paper discusses the main performance barriers for solving a large number of
independent ordinary differential equation systems on processors (CPU) and graphics cards …

Multistability and chaos in SEIRS epidemic model with a periodic time-dependent transmission rate

EL Brugnago, EC Gabrick, KC Iarosz… - … Journal of Nonlinear …, 2023 - pubs.aip.org
In this work, we study the dynamics of a susceptible-exposed-infectious-recovered-
susceptible epidemic model with a periodic time-dependent transmission rate. Emphasizing …

On the threshold of 1/2 order subharmonic emissions in the oscillations of ultrasonically excited bubbles

AJ Sojahrood, H Haghi, NR Shirazi, R Karshafian… - Ultrasonics, 2021 - Elsevier
The pressure threshold for 1/2 order subharmonic (SH) emissions and period doubling
during the oscillations of ultrasonically excited bubbles is thought to be minimum when the …

[HTML][HTML] Influence of the liquid ionic strength on the resonance frequency and shell parameters of lipid-coated microbubbles

AJ Sojahrood, C Yang, C Counil, P Nittayacharn… - Journal of Colloid and …, 2024 - Elsevier
The correct measurement of the resonance frequency and shell properties of coated
microbubbles (MBs) is essential in understanding and optimizing their response to …

Logistic-like and Gauss coupled maps: The born of period-adding cascades

DR da Costa, JGS Rocha, LS de Paiva… - Chaos, Solitons & …, 2021 - Elsevier
In this paper we study a logistic-like and Gauss coupled maps to investigate the period-
adding phenomenon, where infinite sets of periodicity (p) form a sequence in planar …