Fluttering fountains: Stability criteria
نویسندگان
چکیده
منابع مشابه
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...
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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...
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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...
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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 ...
متن کاملNeutral hydrogen in galactic fountains
Simulations of an isolated Milky Way-like galaxy, in which supernovae power a galactic fountain, reproduce the observed velocity and 21 cm brightness statistics of galactic neutral hydrogen (H i). The simulated galaxy consists of a thin H i disk, similar in extent and brightness to that observed in the Milky Way, and extra-planar neutral gas at a range of velocities due to the galactic fountain...
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ژورنال
عنوان ژورنال: Journal of Applied Physics
سال: 1994
ISSN: 0021-8979,1089-7550
DOI: 10.1063/1.355775