Omar Mokhtari
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View article: Millefeuille: The layering of the Martian atmosphere observed in forward scattering geometry
Millefeuille: The layering of the Martian atmosphere observed in forward scattering geometry Open
We report on observations of the atmosphere above the limb of Mars in forward scattering geometry (~174° phase angle) using the Colour and Stereo Surface Imaging System (CaSSIS) aboard the European Space Agency’s ExoMars Trace Gas Orbiter …
View article: The cometary model of dust environments (ComMoDE)
The cometary model of dust environments (ComMoDE) Open
The Cometary Model of Dust Environment (ComMoDE) is a software based on a time-efficient and highly flexible dust model to support the planning and operation of future cometary missions. The ESA Comet Interceptor mission further motivated …
View article: The use of the induced membrane technique in an open fracture of the first phalangeal column of the thumb
The use of the induced membrane technique in an open fracture of the first phalangeal column of the thumb Open
View article: The role of the hot porous layer in the gas flow in the inner coma
The role of the hot porous layer in the gas flow in the inner coma Open
Aims . The objective of this work is to study the influence of a highly non-isothermal porous dust layer on the formation of a comet’s inner coma. We studied the water gas activity of comet 67P/Churyumov-Gerasimenko to find a link between …
View article: Recurrence of a dermatofibrosarcoma protuberans? Rare case
Recurrence of a dermatofibrosarcoma protuberans? Rare case Open
Dermatofibrosarcoma protuberans (DFS) is a mesenchymal-origin skin tumor with intermediate malignancy. Though rare, it's not exceptional, comprising about 0.1% of malignant skin tumors. The authors discuss clinical, radiological, histopath…
View article: Sufficiency of near-surface water ice as a driver of dust activity on comets
Sufficiency of near-surface water ice as a driver of dust activity on comets Open
Context. Nearly all contemporary theoretical research on cometary dust activity relies on models depicting heat transfer and sublimation products within the near-surface porous layer. Gas flow exerts a pressure drag to the crust agglomerat…
View article: Localised sublimation under cometary dust mantles
Localised sublimation under cometary dust mantles Open
Observations of cometary surfaces have indicated that the amount of exposed surficial water ice is insufficient to supply the measured water production rates within the inner solar system. The measured water production rates are also a sma…
View article: Gas sublimation through cometary surface dust mantle
Gas sublimation through cometary surface dust mantle Open
Recent observations of comet surfaces have prompted a closer examination of the discrepancy between the observed amount of exposed water ice and the measured water production rates within our solar system's inner regions. The visible surfa…
View article: A web of sticky strands: how localized stress controls spatio-temporal fluctuations in viscoelastic flows through a lattice of obstacles
A web of sticky strands: how localized stress controls spatio-temporal fluctuations in viscoelastic flows through a lattice of obstacles Open
Recent microfluidic experiments have evidenced complex spatio-temporal fluctuations in low-Reynolds-number flows of polymer solutions through lattices of obstacles. However, understanding the nonlinear physics of such systems remains a cha…
View article: Properties of the gas escaping from a non-isothermal porous dust surface layer of a comet
Properties of the gas escaping from a non-isothermal porous dust surface layer of a comet Open
Estimation of the properties of the sublimation products leaving the cometary nucleus is one of the significant questions in the study of the dusty-gas flow following the Rosetta mission. It is widely assumed that the temperature of the wa…
View article: A versatile micromodel technology to explore biofilm development in porous media flows
A versatile micromodel technology to explore biofilm development in porous media flows Open
We present a novel micromodel technology to explore bacterial biofilm development in porous media flows and demonstrate how it can be used to study the growth/detachment dynamics of Pseudomonas aeruginosa .
View article: A staggered projection scheme for viscoelastic flows
A staggered projection scheme for viscoelastic flows Open
We develop a numerical scheme for the flow of viscoelastic fluids, including the Oldroyd-B and FENE-CR constitutive models. The space discretization is staggered, using either the Marker-And-Cell (MAC) scheme for structured nonuniform grid…
View article: Extraskeletal myxoid chondrosarcoma: a case report
Extraskeletal myxoid chondrosarcoma: a case report Open
Extraskeletal myxoid chondrosarcoma is a rare mesenchymal neoplasm of uncertain differentiation, characterized morphologically by abundant myxoid stroma, a multinodular growth pattern, and uniform cells arranged in strands, clusters, and r…
View article: Birefringent strands drive the flow of viscoelastic fluids past obstacles
Birefringent strands drive the flow of viscoelastic fluids past obstacles Open
The flow of polymer solutions past solid obstacles or through porous media gives rise to rich physical phenomena over a wide range of spatial and temporal scales. Viscoelasticity, in particular, can induce a strong nonlinear response with …
View article: Ecoulement des polymères à travers des milieux poreux : impact des effets viscoélastiques à l'échelle des pores sur les propriétés effectives à l'échelle de Darcy
Ecoulement des polymères à travers des milieux poreux : impact des effets viscoélastiques à l'échelle des pores sur les propriétés effectives à l'échelle de Darcy Open
The flow of polymer solutions through porous media is a rich problem in fluid mechanics, combining the complexity of flows through porous structures with the nonlinear rheology of the fluid. Such flows can display peculiar behaviours over …
View article: A Marker-and-Cell Scheme for Viscoelastic Flows on Non Uniform Grids
A Marker-and-Cell Scheme for Viscoelastic Flows on Non Uniform Grids Open