Charge radiation in a convectively unstable medium

AbstractSheet-like clouds are common in turbulent gas and perhaps form via collisions between turbulent gas flows. Having examined the evolution of an isothermal shocked slab in an earlier contribution, in this work we follow the evolution of a sheet-like cloud confined by (thermal) pressure and gas in it is allowed to cool. The extant purpose of this endeavour is to study the early phases of core-formation. The observed evolution of this cloud supports the conjecture that molecular clouds themselves are three-phase media (comprising viz. a stable cold and warm medium, and a third thermally unstable medium), though it appears, clouds may evolve in this manner irrespective of whether they are gravitationally bound. We report, this sheet fragments initially due to the growth of the thermal instability (TI) and some fragments are elongated, filament-like. Subsequently, relatively large fragments become gravitationally unstable and sub-fragment into smaller cores. The formation of cores appears to be a three stage process: first, growth of the TI leads to rapid fragmentation of the slab; second, relatively small fragments acquire mass via gas-accretion and/or merger and third, sufficiently massive fragments become susceptible to the gravitational instability and sub-fragment to form smaller cores. We investigate typical properties of clumps (and smaller cores) resulting from this fragmentation process. Findings of this work support the suggestion that the weak velocity field usually observed in dense clumps and smaller cores is likely seeded by the growth of dynamic instabilities. Simulations were performed using the smooth particle hydrodynamics algorithm.

Analysis of Tamm's problem on charge radiation at its uniform motion over a finite trajectory

Czechoslovak Journal of Physics ◽

10.1007/bf01597796 ◽

1989 ◽

Vol 39 (4) ◽

pp. 368-383 ◽

Cited By ~ 18

Author(s):

V. P. Zrelov ◽

J. Ružička

Keyword(s):

Uniform Motion ◽

Charge Radiation

Modernism and Still Life

10.3366/edinburgh/9781474455138.001.0001 ◽

2020 ◽

Author(s):

Claudia Tobin

Keyword(s):

Virginia Woolf ◽

Visual Arts ◽

Visual Art ◽

Wallace Stevens ◽

Still Life ◽

Visual Artists ◽

Literary Responses ◽

Unstable Medium ◽

Point Of Departure ◽

Original Approach

The late nineteenth and early twentieth centuries have been characterised as the ‘age of speed’ but they also witnessed a reanimation of still life across different art forms. This book takes an original approach to still life in modern literature and the visual arts by examining the potential for movement and transformation in the idea of stillness and the ordinary. It proposes that still life can be understood not only as a genre of visual art but also as a mode of attentiveness and a way of being in the world. It ranges widely in its material, taking Cézanne and literary responses to his still life painting as its point of departure. It investigates constellations of writers, visual artists and dancers including D. H. Lawrence, Virginia Woolf, David Jones, Winifred Nicholson, Wallace Stevens, and lesser-known figures including Charles Mauron and Margaret Morris. Modernism and Still Life reveals that at the heart of modern art were forms of stillness that were intimately bound up with movement. The still life emerges charged with animation, vibration and rhythm, an unstable medium, unexpectedly vital and well suited to the expression of modern concerns.

Solitons in an Unstable Medium

Journal of the Physical Society of Japan ◽

10.1143/jpsj.56.3069 ◽

1987 ◽

Vol 56 (9) ◽

pp. 3069-3081 ◽

Cited By ~ 15

Author(s):

Tetsu Yajima ◽

Miki Wadati

Keyword(s):

Unstable Medium

Front propagation in laser-tweezed lipid bilayer tubules

MRS Proceedings ◽

10.1557/proc-463-173 ◽

1996 ◽

Vol 463 ◽

Author(s):

Peter D. Olmsted ◽

Fred C. Mackintosh

Keyword(s):

Surface Tension ◽

Boundary Conditions ◽

Lipid Bilayer ◽

Control Parameter ◽

Laser Intensity ◽

Front Propagation ◽

Chemical Potentials ◽

Unstable Medium ◽

Lipid Tubules ◽

Correct Boundary Conditions

AbstractWe study the mechanism of the ‘pearling’ instability seen recently in experiments on lipid tubules under a local applied laser intensity. We argue that the correct boundary conditions are fixed chemical potentials, or surface tensions Σ, at the laser spot and the reservoir in contact with the tubule. While most qualitative conclusions of previous studies remain the same, the ‘ramped’ control parameter (surface tension) implies several new features. We also explore some consequences of front propagation into a noisy unstable medium.

Equivalence principle and point charge radiation

Scientific Herald of Uzhhorod University Series Physics ◽

10.24144/2415-8038.1999.4.102-111 ◽

1999 ◽

Vol 4 (0) ◽

pp. 102-111

Author(s):

Р. Р. Ломпей ◽

С. Ю. Медведєв

Keyword(s):

Equivalence Principle ◽

Point Charge ◽

Charge Radiation

Pulse Dynamics in an Unstable Medium

SIAM Journal on Applied Mathematics ◽

10.1137/s0036139995284085 ◽

1997 ◽

Vol 57 (1) ◽

pp. 205-251 ◽

Cited By ~ 16

Author(s):

G. R. Ierley ◽

N. J. Balmforth ◽

R. Worthing

Keyword(s):

Pulse Dynamics ◽

Unstable Medium

Charge radiation in nonequilibrium media

Radiophysics and Quantum Electronics ◽

10.1007/bf01032950 ◽

1969 ◽

Vol 12 (1) ◽

pp. 84-88

Author(s):

Yu. V. Chugunov

Keyword(s):

Charge Radiation

Quantum Power Distribution of Relativistic Acceleration Radiation: Classical Electrodynamic Analogies with Perfectly Reflecting Moving Mirrors

Symmetry ◽

10.3390/sym13040653 ◽

2021 ◽

Vol 13 (4) ◽

pp. 653

Author(s):

Abay Zhakenuly ◽

Maksat Temirkhan ◽

Michael R. R. Good ◽

Pisin Chen

Keyword(s):

Power Distribution ◽

Point Charge ◽

Lorentz Invariance ◽

Classical Electrodynamic ◽

Classical Electrodynamics ◽

Charge Radiation

We find the quantum power emitted and distribution in 3 + 1-dimensions of relativistic acceleration radiation using a single perfectly reflecting mirror via Lorentz invariance, demonstrating close analogies to point charge radiation in classical electrodynamics.

___________________________: SILENCE, THE AFFECT PHRASE, THE WAIT.

eTopia ◽

10.25071/1718-4657.36739 ◽

2008 ◽

Author(s):

Josh Schwebel

Keyword(s):

Conscious Perception ◽

Unstable Medium ◽

Adequate Representation ◽

The Subject ◽

Exchange Language

The relation between experience, language and reality is not immediate or equivalent. While often conflated to demand a commensurate exchange, language is an unstable medium that can be full or empty of ‘truth’. When people have differing accounts of what may seem to be the same reality, the variability of language becomes more apparent. An event may take place before a group of witnesses and each retelling may be different. Indeed, depending on its nature, an event may have caused a trauma to the extent that the experience may never achieve adequate representation in language. Each witness may struggle to recall an experience that exceeds the capacity of conscious perception. The only testimony of such an experience may be silence or inarticulate sound that communicates more than meaning and less than sense. Does this entail that nothing happened? An absence of speech could mean that there is nothing to say or that nothing can be said – silence is indistinguishably non-language and an allusion to the limits of language. Jean-Francois Lyotard’s The Differend: Phrases in Dispute pursues the limits of language. Herein Lyotard asks, "How can you establish what is not without criticizing what is? The undetermined cannot be established" (Lyotard, 9). This paper will examine the potential of silence to depose the subject through Lyotard’s concepts of the differend, the affect-phrase, the event and reality.