164,101 research outputs found
Four-dimensional worldwide atmospheric models: ANYPT and ANYRG
Computer programs read magnetic-tape data bases and computer meteorological profiles for any position, time, and height (from zero to 25 km). System assists in analyses of distortion of information obtained from aircraft-mounted or spacecraft-mounted electromagnetic sensors
Magnetic Oscillations of a Fractional Hall Dot
We show that a quantum dot in the fractional Hall regime exhibits mesoscopic
magnetic oscillations with a period which is a multiple of the period for free
electrons. Our calculations are performed for parabolic quantum dots with
hard-core electron-electron interactions and are exact in the strong field
limit for smaller than the fractional Hall gap. Explicit expressions
are given for the temperature dependence of the amplitude of the oscillations.Comment: 11 pages, IUCM-004, plain te
Inequality and Network Formation Games
This paper addresses the matter of inequality in network formation games. We
employ a quantity that we are calling the Nash Inequality Ratio (NIR), defined
as the maximal ratio between the highest and lowest costs incurred to
individual agents in a Nash equilibrium strategy, to characterize the extent to
which inequality is possible in equilibrium. We give tight upper bounds on the
NIR for the network formation games of Fabrikant et al. (PODC '03) and Ehsani
et al. (SPAA '11). With respect to the relationship between equality and social
efficiency, we show that, contrary to common expectations, efficiency does not
necessarily come at the expense of increased inequality.Comment: 27 pages. 4 figures. Accepted to Internet Mathematics (2014
Generalized strategies in the Minority Game
We show analytically how the fluctuations (i.e. standard deviation) in the
Minority Game (MG) can be made to decrease below the random coin-toss limit if
the agents use more general behavioral strategies. This suppression of the
standard deviation results from a cancellation between the actions of a crowd,
in which agents act collectively and make the same decision, and an anticrowd
in which agents act collectively by making the opposite decision to the crowd.Comment: Revised manuscript: a few minor typos corrected. Results unaffecte
Domino Waves
Motivated by a proposal of Daykin (Problem 71-19*, SIAM Review 13 (1971)
569), we study the wave that propagates along an infinite chain of dominoes and
find the limiting speed of the wave in an extreme case.Comment: 10 pages, 5 figure
Ensemble Density Functional Theory for Inhomogeneous Fractional Quantum Hall Systems
The fractional quantum Hall effect (FQHE) occurs at certain magnetic field
strengths B*(n) in a two-dimensional electron gas of density n at strong
magnetic fields perpendicular to the plane of the electron gas. At these
magnetic fields strengths, the system is incompressible, i.e., there is a
finite cost in energy for creating charge density fluctuations in the bulk,
while the boundary of the electron gas has gapless modes of density waves. The
bulk energy gap arises because of the strong electron-electron interactions.
While there are very good models for infinite homogeneous systems and for the
gapless excitations of the boundary of the electron gas, computational methods
to accurately model finite, inhomogeneous systems with more then about ten
electrons have not been available until very recently. We will here review an
ensemble density functional approach to studying the ground state of large
inhomogeneous spin polarized FQHE systems.Comment: 23 pages (revtex), 6 Postscript figures. To be published in Int. J.
Quant. Chem. (invited talk at the 1996 Sanibel Symposium
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