3,528 research outputs found
A Drift-Kinetic Analytical Model for SOL Plasma Dynamics at Arbitrary Collisionality
A drift-kinetic model to describe the plasma dynamics in the scrape-off layer
region of tokamak devices at arbitrary collisionality is derived. Our
formulation is based on a gyroaveraged Lagrangian description of the charged
particle motion, and the corresponding drift-kinetic Boltzmann equation that
includes a full Coulomb collision operator. Using a Hermite-Laguerre velocity
space decomposition of the gyroaveraged distribution function, a set of
equations to evolve the coefficients of the expansion is presented. By
evaluating explicitly the moments of the Coulomb collision operator,
distribution functions arbitrarily far from equilibrium can be studied at
arbitrary collisionalities. A fluid closure in the high-collisionality limit is
presented, and the corresponding fluid equations are compared with
previously-derived fluid models
Curvature-driven coarsening in the two dimensional Potts model
We study the geometric properties of polymixtures after a sudden quench in
temperature. We mimic these systems with the -states Potts model on a square
lattice with and without weak quenched disorder, and their evolution with Monte
Carlo simulations with non-conserved order parameter. We analyze the
distribution of hull enclosed areas for different initial conditions and
compare our results with recent exact and numerical findings for (Ising)
case. Our results demonstrate the memory of the presence or absence of
long-range correlations in the initial state during the coarsening regime and
exhibit super-universality properties.Comment: 12 pages, 16 figure
Effect of Sr substitution on superconductivity in Hg2(Ba1-ySry)2YCu2O8-d (part2): bond valence sum approach of the hole distribution
The effects of Sr substitution on superconductivity, and more particulary the
changes induced in the hole doping mechanism, were investigated in
Hg2(Ba1-ySry)2YCu2O8-d by a "bond valence sum" analysis with Sr content from y
= 0.0 to y = 1.0. A comparison with CuBa2YCu2O7-d and Cu2Ba2YCu2O8 systems
suggests a possible explanation of the Tc enhancement from 0 K for y = 0.0 to
42 K for y = 1.0. The charge distribution among atoms of the unit cell was
determined from the refined structure, for y = 0.0 to 1.0. It shows a charge
transfer to the superconducting CuO2 plane via two doping channels pi(1) and
pi(2), i.e. through O2(apical)-Cu and Ba/Sr-O1 bonds respectively.Comment: 13 pages, 5 figures, accepted for publication in Journal of Physics:
Condensed Matte
Exploring drivers to engage in fashion luxury consumption
The main purpose of the current study is to analyze how desire, perceived-self, social
values and involvement are related to consumer engagement into the fashion luxury
industry. A sample of 295 luxury fashion consumers participate in the study. Findings
suggest that perceived-self is not one of the most significant driver to consumer
engagement. Subjective well-being may also act as an outcome of consumer engagement.
The article also provides managerial implications, limitations and further research.info:eu-repo/semantics/acceptedVersio
It is all about exhibitionism!: The fashion passionate desire of e-buyers
The aim of this study is to explore the effect of social context on passion for fashion and the exhibitionist tendency. The study was conducted in two phases, the first one being exploratory (n=109), followed by a quantitative phase (n=425). The findings reveal that the social influence is very important in enhancing the desire to use fashion products. Further, the exhibitionist tendency acts as a mediator between passionate desire for fashion products and word-of-mouth.info:eu-repo/semantics/acceptedVersio
Fast magnetic reconnection in the plasmoid-dominated regime
A conceptual model of resistive magnetic reconnection via a stochastic
plasmoid chain is proposed. The global reconnection rate is shown to be
independent of the Lundquist number. The distribution of fluxes in the
plasmoids is shown to be an inverse square law. It is argued that there is a
finite probability of emergence of abnormally large plasmoids, which can
disrupt the chain (and may be responsible for observable large abrupt events in
solar flares and sawtooth crashes). A criterion for the transition from
magnetohydrodynamic to collisionless regime is provided.Comment: 4 pages, 1 figur
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