12,882 research outputs found
Emotional abuse in sport: A case study of trichotillomania in a prepubescent female gymnast
This article is made available through the Brunel Open Access Publishing Fund. Copyright @ 2013 Gervis M, et al. This is an open-access article distributed under
the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and
source are credited.Despite improved legislation in most countries, child abuse in sport continues to exist but is a problem which is often under reported or ignored. In elite sport ‘suffering’ is not uncommon and hence sometimes child abuse is sometimes unrecognised, de-emphasised or easily dismissed as part of a collective experience that is perceived to be necessary to ‘create’ elite athletes. However, even swearing, anger, raised voices and negative comments directed at child athletes by coaches is considered abuse and can, when regular and routine, cause long term wellbeing and health issues. Self-harm can be a consequence and here self-harm in the form of trichotillomania, self hair-pulling, is reported for the first time as a secondary consequence of abuse. The 12 year old female gymnast, subject of this case study, presented with this impulse control disorder as defined by the American Psychiatric Association and was successfully treated using cognitive behavioural therapy. However, the training environment, including coach behaviour, did not change and so the gymnast remained at risk of recurrence of self-harm. Such environments in sport have many characteristics in common with and reminiscent of religious cults; sacrifice, isolation, shared obsession, a charismatic leader, and often in the presence of severe calorie restriction. As a consequence of ageing, growth, injury and an unchanging abusive environment, a year later the gymnast retired from the sport
Quarkonium Mass Splitting Revisited: Effects of Closed Mesonic Channels
Modifications of the mass spectrum the quarkonium induced by its virtual
dissociation into a pair of heavy mesons is considered. Coupling between quark
and mesonic channels results in noticeable corrections to spin-dependent mass
splitting. In particular, the observable hierarchy of mass splittings in the
and multiplets is reproduced.Comment: 9 pages, plain LaTe
Absence of hyperuniformity in amorphous hard-sphere packings of nonvanishing complexity
We relate the structure factor in a system of
jammed hard spheres of number density to its complexity per particle
by the formula . We have verified this formula for
the case of jammed disks in a narrow channel, for which it is possible to find
and analytically. Hyperuniformity, which is the
vanishing of , will therefore not occur if the
complexity is nonzero. An example is given of a jammed state of hard disks in a
narrow channel which is hyperuniform when generated by dynamical rules that
produce a non-extensive complexity.Comment: 5 pages, 3 figure
Understanding the ideal glass transition: Lessons from an equilibrium study of hard disks in a channel
We use an exact transfer-matrix approach to compute the equilibrium
properties of a system of hard disks of diameter confined to a
two-dimensional channel of width at constant longitudinal
applied force. At this channel width, which is sufficient for
next-nearest-neighbor disks to interact, the system is known to have a great
many jammed states. Our calculations show that the longitudinal force
(pressure) extrapolates to infinity at a well-defined packing fraction
that is less than the maximum possible , the latter
corresponding to a buckled crystal. In this quasi-one-dimensional problem there
is no question of there being any \emph{real} divergence of the pressure at
. We give arguments that this avoided phase transition is a structural
feature -- the remnant in our narrow channel system of the hexatic to crystal
transition -- but that it has the phenomenology of the (avoided) ideal glass
transition. We identify a length scale as our equivalent of the
penetration length for amorphous order: In the channel system, it reaches a
maximum value of around at , which is larger than the
penetration lengths that have been reported for three dimensional systems. It
is argued that the -relaxation time would appear on extrapolation to
diverge in a Vogel-Fulcher manner as the packing fraction approaches .Comment: 17 pages, 16 figure
Measurement of tan beta in associated t H^\pm Production in gamma gamma Collisions
The ratio of neutral Higgs field vacuum expectation values, tan beta, is one
of the most important parameters to determine in type-II Two-Higgs Doublet
Models (2HDM), specifically the Minimal Supersymmetric Standard Model (MSSM).
Assuming the energies and integrated luminosity of a future high energy e^+e^-
linear collider of sqrt{s}=500, 800, 1000, and 1500 GeV and L=1 ab^{-1} we show
that associated t H^+/- production in gamma gamma collisions can be used to
make an accurate determination of tan beta for low and high tan beta by
precision measurements of the gamma gamma -> H^+/- t + X cross section.Comment: 7 pages, 11 figures, uses REVTEX
Systems thinking research - principles and methodologies to grapple with complex real world problems
- …