Carlos Alberto Chavez Barajas

The effects of heat and mass diffusion on freely oscillating bubbles in a viscoelastic, tissue-like medium

In certain cavitation-based ultrasound techniques, the relative importance of thermally vs mechanically induced damage is unclear. As a first step to investigate this matter, a numerical model for bubble dynamics in tissue-like, viscoelastic media is presented in which full thermal effects are included inside and outside the bubble, as well as interdiffusion of vapor and non-condensible gas inside the bubble. Soft tissue is assumed to behave according to a Kelvin-Voigt model in which viscous and elastic contributions are additive. A neo-Hookean formulation, appropriate for finite-strain elasticity, accounts for the large deformations produced by cavitation. Numerical solutions to problems of relevance to therapeutic ultrasound are examined, and linear analysis is used to explain the underlying mechanisms. The dependence between the surrounding mediums elasticity (shear modulus) and the extent to which the effects of heat and mass transfer influence bubble dynamics is quantified. In particular, the oscillation properties are related to the eigenvalues determined from linear theory. Regimes under which a polytropic relation describes the heat transfer to sufficient accuracy are identified, for which the complexity and computational expense associated with solving full partial differential equations can be avoided.

Measurement of the branching ratio Γ(Λ0b→ψ(2S)Λ0)/Γ(Λ0b→J/ψΛ0) with the ATLAS detector

An observation of the

The effects of heat and mass transfer on free oscillations of a bubble in a viscoelastic, tissue-like medium

\Lambda_b^0 \rightarrow \psi(2S) \Lambda^0

Heat and mass transfer effects on forced radial oscillations in soft tissue

decay and a comparison of its branching fraction with that of the

High strain-rate soft material characterization via inertial cavitation

\Lambda_b^0 \rightarrow J/\psi \Lambda^0

High Strain-rate Soft Material Characterization via Inertial Cavitation

decay has been made with the ATLAS detector in proton--proton collisions at

Measurement of the total cross section from elastic scattering in pp collisions at View the MathML sources=8 TeV with the ATLAS detector

\sqrt{s}=8\,

Search for high-mass new phenomena in the dilepton final state using proton–proton collisions at View the MathML sources=13TeV with the ATLAS detector

TeV at the LHC using an integrated luminosity of

Measurement of exclusive γγ→ℓ+ℓ−γγ→ℓ+ℓ− production in proton–proton collisions at View the MathML sources=7 TeV with the ATLAS detector

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Two-particle BoseEinstein correlations in pp collisions at √s = 0.9 and 7 TeV measured with the ATLAS detector

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