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Contents Ann. Phys. 52011

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Ann. Phys. (Berlin) 523, No. 5, 355 – 357 (2011) / DOI 10.1002/andp.201152305
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Page 358 – 359
Ulrich Eckern
Page 360 – 379
Carl-Heinz Krutzsch
Translation by Diogo Bolster, Robert Hershberger, and Russell J. Donnelly
On an experimentally observed phenomenon on vortex rings
during their translational movement in a real liquid
Annalen der Physik 427, 497 (1939)
In an investigation on vortex rings suggested to
the author by Prof. Tomaschek, he succeeded
in observing a novel phenomenon, namely the
appearance of waves on the core of the vortex
ring and unstable regions within the rings. The
success was mainly attributed to a novel coloring method we applied. The present paper
gives a thorough description of the observed
phenomena, specifically including quantitative
observations, and attempts an interpretation of
the results.
Page 380 – 382
Diogo Bolster, Robert Hershberger, and Russell J. Donnelly
An appreciation of the 1939 paper
“On an experimentally observed phenomenon on vortex rings ...”
by Carl-Heinz Krutzsch
© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Page 383 – 401
Alberto Favaro and Luzi Bergamin
The non-birefringent limit of all linear, skewonless media and its
unique light-cone structure
Based on a recent work by Schuller
et al., a geometric representation of
all skewonless, non-birefringent linear media is obtained. The derived
constitutive law is based on a “core”,
encoding the optical metric up to
a constant. All further corrections
are provided by two (anti-)selfdual
bivectors, and an “axion”. The bivectors are found to vanish if the optical metric has signature (3,1) – that is, if the
Fresnel equation is hyperbolic.
Page 402 – 407
R. Mar-Sarao, F. Soto-Eguibar, and H. Moya-Cessa
Many fields interaction: Beam splitters and waveguide arrays
The interaction of many fields is studied. The authors obtain an effective
Hamiltonian for this system by using a method recently introduced that produces a small rotation to the Hamiltonian that allows to neglect some terms in
the rotated Hamiltonian. They show that coherent states remain coherent under the action of a quadratic Hamiltonian and they also show that a system of
n interacting harmonic oscillators, initially in coherent states, remain coherent
during the interaction.
Page 408 – 416
Y. Friedman
The maximal acceleration, extended relativistic dynamics and
Doppler type shift for an accelerated source
Based on the generalized principle of
relativity and the ensuing symmetry, it
has been shown that if the Clock Hypothesis is not true, there is a universal
maximal acceleration am . The author
presents here an extension of relativistic
dynamics for which all admissible solutions will have have a speed bounded
by the speed of light c and the acceleration bounded by am . An additional
Doppler type shift for an accelerated
source is predicted. The formulas for such shift are the same as for the usual
Doppler shift with v/c replaced by a/am .
© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Ann. Phys. (Berlin) 523, No. 5 (2011)
Page 417 – 422
Feng Peng and Ding Hui
Reversal of coherent-state spins in square magnetic nanodots
induced by a magnetic microwave field
The authors study the coherent state excitation of spins in square nanodots
induced by a magnetic microwave field. They present a new mechanism of
spin reversal in nanodots. That is, the microwave field directly induces the
reversal of the coherent-state spins instead of indirectly through the magnetic
vortex. They obtain the space distribution of coherent-state spins in terms of
a quantum theory, and calculate the time of spin reversal. This spin-reversal
process may be used to serve as a storage mechanism of binary information.
Page 423 – 434
A. Tawfik
The Hubble parameter in the early universe with viscous QCD
matter and finite cosmological constant
The evolution of a flat,
isotropic and homoge1.5
neous universe is studied. The background
geometry in the early
phases of the universe is
conjectured to be filled
with causal bulk viscous
fluid and dark energy.
The energy density rela1.0
tions obtained from the
assumption of covariant conservation of energy-momentum tensor of the background matter in the early universe are used to derive the basic equation for
the Hubble parameter H. The viscous properties described by ultra-relativistic
equations of state and bulk viscosity taken from recent heavy-ion collisions
and lattice QCD calculations have been utilized to give an approximate solution of the field equations. The cosmological constant is conjectured to be
related to the energy density of the vacuum. In this treatment, there is a clear
evidence for singularity at vanishing cosmic time t indicating the dominant
contribution from the dark energy. The time evolution of H seems to last for
much longer time than the ideal case, where both cosmological constant and
viscosity coefficient are entirely vanishing.
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© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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