1,124 research outputs found
Comparison of performance of concussed and non-concussed individuals on Subtest VIII of the C-RTT
The purpose of this study was to investigate auditory comprehension in concussed and non-concussed individuals using Subtest VIII of the C-RTT. Thirty non-concussed individuals were matched as closely as possible on gender, age, education and history of concussion to a group of concussed individuals. A Mann-Whitney found that the two samples were significant different at p = .020, and a t-test found a significant difference at p = .008 on the Efficiency Score (ES) of Subtest VIII. The non-concussed individuals performed better than the concussed individuals. Efficiency Score may be useful in assessing comprehension in concussed individuals
Phase diagram of the random field Ising model on the Bethe lattice
The phase diagram of the random field Ising model on the Bethe lattice with a
symmetric dichotomous random field is closely investigated with respect to the
transition between the ferromagnetic and paramagnetic regime. Refining
arguments of Bleher, Ruiz and Zagrebnov [J. Stat. Phys. 93, 33 (1998)] an exact
upper bound for the existence of a unique paramagnetic phase is found which
considerably improves the earlier results. Several numerical estimates of
transition lines between a ferromagnetic and a paramagnetic regime are
presented. The obtained results do not coincide with a lower bound for the
onset of ferromagnetism proposed by Bruinsma [Phys. Rev. B 30, 289 (1984)]. If
the latter one proves correct this would hint to a region of coexistence of
stable ferromagnetic phases and a stable paramagnetic phase.Comment: Article has been condensed and reorganized; Figs 3,5,6 merged; Fig 4
omitted; Some discussion added at end of Sec. III; 9 pages, 5 figs, RevTeX4,
AMSTe
The Kohn mode for trapped Bose gases within the dielectric formalism
The presence of undamped harmonic center of mass oscillations of a weakly
interacting Bose gas in a harmonic trap is demonstrated within the dielectric
formalism for a previously introduced finite temperature approximation
including exchange. The consistency of the approximation with the Kohn theorem
is thereby demonstrated. The Kohn modes are found explicitly, generalizing an
earlier zero-temperature result found in the literature. It is shown how the
Kohn mode disappears from the single-particle spectrum, while remaining in the
density oscillation spectrum, when the temperature increases from below to
above the condensation temperature.Comment: 6 pages revte
Correlation between ImPACT reaction time and CRTT efficiency score in concussed athletes
The management of sports related concussion is dependent upon a standardized assessment. Reaction time is the most sensitive measure of a concussion when using the ImPACT battery, which was standardized on concussed athletes. However, an athlete’s auditory comprehension is rarely assessed systematically. Auditory comprehension status is important in properly managing concussed athletes. The Computerized Revised Token Test (CRTT) measures efficiency time. The purpose of this investigation was to determine the correlation between the ImPACT reaction time and the CRTT-Subtest VIII efficiency score in 51 concussed athletes. These two measures are statistically significantly correlated. Clinical implications are discussed
Stationary Properties of a Randomly Driven Ising Ferromagnet
We consider the behavior of an Ising ferromagnet obeying the Glauber dynamics
under the influence of a fast switching, random external field. Analytic
results for the stationary state are presented in mean-field approximation,
exhibiting a novel type of first order phase transition related to dynamic
freezing. Monte Carlo simulations performed on a quadratic lattice indicate
that many features of the mean field theory may survive the presence of
fluctuations.Comment: 5 pages in RevTex format, 7 eps/ps figures, send comments to
"mailto:[email protected]", submitted to PR
Exploring Set-Theoretic Practices of Youth Engagement in Connective Journalism: What We Lose in School-Mathematical Descriptions
Analyzing youth video submissions regarding COVID-19 to KQEDâs âLetâs Talk About the Electionâ website, we explore the mathematics these youth engaged in through their submissions without creating any explicit connection to school mathematical concepts or standards. Our focus is the studentsâ construction of sets (e.g. sets of nurses, doctors, American workers), as a means of creating connection with voters and other media authors through Marchi and Clarkâs (2021) construct of connective journalism. We observe these youth constructing sets of varying sizes and reflecting on how these sets are contextualized within a larger political dialogue. We also attempt to rewrite part of one student composition using school mathematical symbolic logic, reviewing what in the studentâs message is no longer present in the school mathematical analogue and why. We conclude by encouraging practitioners to explore with their students other instances in which they can challenge numerical or school mathematical symbolic writing as a superior means of communicating ideas
A New Method for Computing Topological Pressure
The topological pressure introduced by Ruelle and similar quantities describe
dynamical multifractal properties of dynamical systems. These are important
characteristics of mesoscopic systems in the classical regime. Original
definition of these quantities are based on the symbolic description of the
dynamics. It is hard or impossible to find symbolic description and generating
partition to a general dynamical system, therefore these quantities are often
not accessible for further studies. Here we present a new method by which the
symbolic description can be omitted. We apply the method for a mixing and an
intermittent system.Comment: 8 pages LaTeX with revtex.sty, the 4 postscript figures are included
using psfig.tex to appear in PR
Anion emission from water molecules colliding with positive ions: Identification of binary and many-body processes
It is shown that negative ions are ejected from gas-phase water molecules
when bombarded with positive ions at keV energies typical of solar-wind
velocities. This finding is relevant for studies of planetary and cometary
atmospheres, as well as for radiolysis and radiobiology. Emission of both H-
and heavier (O- and OH-) anions, with a larger yield for H-, was observed in
6.6-keV 16O+ + H2O collisions. The ex-perimental setup allowed separate
identification of anions formed in collisions with many-body dynamics from
those created in hard, binary collisions. Most of the ani-ons are emitted with
low kinetic energy due to many-body processes. Model calcu-lations show that
both nucleus-nucleus interactions and electronic excitations con-tribute to the
observed large anion emission yield.Comment: 5 pages, 4 figure
- âŠ