40 research outputs found
Hydrodynamic Detonation Instability in Electroweak and QCD Phase Transitions
The hydrodynamic stability of deflagration and detonation bubbles for a first
order electroweak and QCD phase transition has been discussed recently with the
suggestion that detonations are stable. We examine here the case of a
detonation more carefully. We find that in front of the bubble wall
perturbations do not grow with time, but behind the wall modes exist which grow
exponentially. We briefly discuss the possible meaning of this instability.Comment: 12 pages, 3 figures available on request, Latex,
FERMILAB--PUB--93/098--
Uniform Shock Waves in Disordered Granular Matter
The confining pressure is perhaps the most important parameter
controlling the properties of granular matter. Strongly compressed granular
media are, in many respects, simple solids in which elastic perturbations
travel as ordinary phonons. However, the speed of sound in granular aggregates
continuously decreases as the confining pressure decreases, completely
vanishing at the jamming-unjamming transition. This anomalous behavior suggests
that the transport of energy at low pressures should not be dominated by
phonons. In this work we use simulations and theory to show how the response of
granular systems becomes increasingly nonlinear as pressure decreases. In the
low pressure regime the elastic energy is found to be mainly transported
through nonlinear waves and shocks. We numerically characterize the propagation
speed, shape, and stability of these shocks, and model the dependence of the
shock speed on pressure and impact intensity by a simple analytical approach.Comment: 12 pages, 11 figure
Anisotropy of polarizability of the silatranes
1. Polarizability parameters have been determined for the Si-C and Si-O bonds. The Si-O bond of the siloxanes does not show axial symmetry. 2. The axes of the molecular polarizability ellipsoid for 1-methylsilatrane have been determined. 3. The transannular N → Si bond shows a pronounced anisotropy of polarizability in the silatranes. © 1977 Plenum Publishing Corporation
Anisotropy of polarizability of the silatranes
1. Polarizability parameters have been determined for the Si-C and Si-O bonds. The Si-O bond of the siloxanes does not show axial symmetry. 2. The axes of the molecular polarizability ellipsoid for 1-methylsilatrane have been determined. 3. The transannular N → Si bond shows a pronounced anisotropy of polarizability in the silatranes. © 1977 Plenum Publishing Corporation
Anisotropy of polarizability of the silatranes
1. Polarizability parameters have been determined for the Si-C and Si-O bonds. The Si-O bond of the siloxanes does not show axial symmetry. 2. The axes of the molecular polarizability ellipsoid for 1-methylsilatrane have been determined. 3. The transannular N → Si bond shows a pronounced anisotropy of polarizability in the silatranes. © 1977 Plenum Publishing Corporation
Determination of the235U concentration in the aqueous coolant of the first circuit of a nuclear reactor
Bromine- and iodine-containing (Haloalkyl)trichlorosilanes and methyl(Haloalkyl)chlorosilanes and their conversions
Anisotropy of polarizability of the silatranes
1. Polarizability parameters have been determined for the Si-C and Si-O bonds. The Si-O bond of the siloxanes does not show axial symmetry. 2. The axes of the molecular polarizability ellipsoid for 1-methylsilatrane have been determined. 3. The transannular N → Si bond shows a pronounced anisotropy of polarizability in the silatranes. © 1977 Plenum Publishing Corporation