Recent results on the semiclassical dynamics of an electron in a solid are explained using techniques developed for “exotic” Galilean dynamics. The system is indeed Hamiltonian and Liouville’s theorem holds for the symplectic volume form. Suitably defined quantities satisfy hydrodynamic equations. cond-mat/0506051. to appear in Mod. Phys. Lett. B. mailto: [email protected] UMR 6207 du CNRS ...

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BACKGROUND Research has demonstrated an association between low birth weight (LBW; <2500 g) and adverse intelligence quotient (IQ) outcomes in childhood and early adolescence. We systematically evaluated whether this association persists into late adolescence and early adulthood and also assessed the influence of age of IQ assessment on effect size. METHODS During Stage 1 (meta-analysis of da...

Public health professionals have the opportunity to impact middle school students’ dietary behaviors to combat childhood obesity. The purpose of this study was to investigate the dietary behavior results from the YRBS taken by middle school students in Duval County in 2009, 2011 and 2013. A two-stage cluster design was used and the survey was completed by 6 through 8 grade students following pa...

Recent years have seen a growing interest in relating MRI measurements to the structural-biophysical properties of white matter fibers. The fiber g-ratio, defined as the ratio between the inner and outer radii of the axon myelin sheath, is an important structural property of white matter, affecting signal conduction. Recently proposed modeling methods that use a combination of quantitative-MRI ...

Motivated by a question of Duval and Reiner about higher Laplacians of simplicial complexes, we describe various relaxations of the defining axioms of matroid theory to obtain larger classes of simplicial complexes that contain pure shifted simplicial complexes. The resulting classes retain some of the matroid properties and allow us to classify matroid properties according to the relevant axio...

Definitions of non-relativistic conformal transformations are considered both in the Newton-Cartan and in the Kaluza-Klein-type Eisenhart/Bargmann geometrical frameworks. The symmetry groups that come into play are exemplified by the cosmological, and also the Newton-Hooke solutions of Newton’s gravitational field equations. It is shown, in particular, that the maximal symmetry group of the sta...