Πλοήγηση ανά Συγγραφέα "Pelekasis, N."
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Acoustic detection of microbubble resonance
Thomas, D. H.; Looney, P.; Steel, R.; Pelekasis, N.; McDicken, W. N.; Anderson, T.; Sboros, V. (2009)Large numbers of acoustic signals from single lipid-shelled Definity (R) microbubbles have been measured using a calibrated microacoustic system and a two population response observed. Theoretical results based on the ... -
The acoustic signature of decaying resonant phospholipid microbubbles
Thomas, D. H.; Butler, M.; Pelekasis, N.; Anderson, T.; Stride, E.; Sboros, V. (2013)Sub-capillary sized microbubbles offer improved techniques for diagnosis and therapy of vascular related disease using ultrasound. Their physical interaction with ultrasound remains an active research field that aims to ... -
Deflection of a liquid metal jet/drop in a tokamak environment
Pelekasis, N.; Benos, L.; Gomes, R. (2014)The interaction of a liquid gallium jet with plasma has been investigated in the ISTTOK tokamak. The jet was observed to remain intact during its interaction with plasma, within a certain length beyond which drop formation ... -
The effect of resonance on transient microbubble response; Response; experimental and theoretical observations
Thomas, D. H.; Butler, M.; Looney, P.; Pelekasis, N.; Sboros, V. (2012)Nonlinear microbubble oscillations can be exploited by signal processing to provide contrast enhancement in ultrasound imaging. High-speed optical investigations have established that microbubbles resonate in-vitro, but ... -
The fate of resonant and off-resonant microbubble signals in response toconsecutive imaging pulses
Thomas, D. H.; Looney, P.; Butler, M.; Anderson, T.; McDicken, W. N.; Sboros, V.; Pelekasis, N. (2010)The study of single microbubble (MB) acoustics has relevance to signal andimage processing of ultrasound (US) contrast imaging. The aim of this work is tostudy the effect of consecutive pulses on MB response. RF backscatter ... -
Investigation of various nozzles configurations with respect to IFMIF and liquid walls concepts
Kakarantzas, S.; Knaepen, B.; Caby, M.; Benos, L.; Sarris, I.; Pelekasis, N. (2015)The study of liquid-metal free surface flows is of great interest in the fusion research, for example in the IFMIF and liquid walls concepts. In the IFMIF project, the main goal is to test candidate metallic materials in ... -
Nano-interrogation of a lipid shelled microbubble
Sboros, V.; Glynos, E.; Pelekasis, N.; Koutsos, V. (2008) -
A new theoretical model for cracked microbubbles
Looney, P.; Thomas, D.; Steel, R.; Anderson, T.; Pelekasis, N.; Sboros, V. (2009)The response of the rigid shelled contrast agent biSphere® has been previously studied optically and acoustically over a range of mechanical index (MI). Free bubble models have been used to model the behaviour of rigid ... -
Nonlinear interaction between a boundary layer and a liquid film
Vlachomitrou, M.; Pelekasis, N. (2009)The nonlinear stability of a laminar boundary layer that flows at high Reynolds number (Re) above a plane surface covered by a liquid film is investigated. The basic flow is considered to be nearly parallel and the simulations ... -
Risk analysis of industrial structures under extreme transient loads
Talaslidis, D. G.; Manolis, G. D.; Paraskevopoulos, E.; Panagiotopoulos, C.; Pelekasis, N.; Tsamopoulos, J. A. (2004)A modular analysis package is assembled for assessing risk in typical industrial structural units such as steel storage tanks, due to extreme transient loads that are produced either as a result of chemical explosions in ... -
Short- to long-wave resonance and soliton formation in boundary-layer interaction with a liquid film
Vlachomitrou, M.; Pelekasis, N. (2010)Dynamic interaction between a boundary layer of air and a liquid film is investigated in this paper. The low air-to-film-viscosity ratio is considered in which case the boundary layer is quasi-steady on the time scale ... -
Stability and simulations of insonated contrast agents-effect of the constitutive law
Pelekasis, N.; Efthimiu, K.; Tsiglifis, K. (2011)Under insonation contrast agents are known to exhibit dynamic patterns such as thresholding, compression only behavior, diffusion and deflation, shape deformation, buckling, jetting and break-up, not all of which can be ... -
Static response and stability of coated microbubbles-multiplicity of solutions and parameter estimation
Lytra, A.; Pelekasis, N. (2014)The static response of a coated microbubble subject to an external pressure distribution is investigated, in order to identify different response patterns with varying viscoelastic properties of the shell. Theoretical and ... -
Three-dimensional stability of free convection vortices in the presence of a magnetic field
Dimopoulos, D.; Pelekasis, N. (2012)Three-dimensional (3D) stability of 2D vortical flow of a liquid metal in a cavity of square cross section is examined. Vortices are produced as a result of free convection and internal heating in the cavity in the presence ...