Fluttering fountains: Annular geometry

Dielectrophoretic force-driven thermal convection in annular geometry

Galactic Fountains as Magnetic Pumps

We study a simple, kinematical model of a galactic fountain ow and show that a horizontal eld in the galactic plane can be pumped into the halo to a height of several kiloparsecs. This pumping eeect results from the topological structure of the ow in which the updraughts (represented by hot gas) form a connected network, whereas the downdraughts (associated with isolated cool clouds) are discon...

Fountains, histograms, and q-identities

Merlini and Sprugnoli [6] discuss fountains and histograms; for the reader’s convenience, we review a few key issues here. A fountain with n coins is an arrangement of n coins in rows such that each coin in a higher row touches exactly two coins in the next lower row. A p-histogram is a sequence of columns in which the height of the ( j +1)st column is at most k + p, if k is the height of colum...

UNUSUAL CAUSE FOR MITRAL VALVE FLUTTERING 599 An Unusual Cause for Mitral Valve Fluttering*

The patient was a 23-year-old white man with Down’s syndrome who was referred to us for evaluation of a heart murmur which had been present since birth. Physical examination revealed a well nourished acyanotic white man (height 5’4”, and weight 110 lb) with typical Down’s facies and a short and slightly webbed appearing neck. The carotid arteries had good upstroke (no bruits), extremities revea...

Experimental Investigation of Impinging Axisymmetric Turbulent Fountains

The behaviour of a turbulent, axisymmetric, Boussinesq, vertical fountain that impinges on a horizontal plate a distance H from the fountain source is investigated. Images from Light Induced Fluorescence visualisation of the flow provide a clear picture of the internal structure of the impinging flow. The interaction between the impinging fountain and the plate results in a buoyant radial wall ...