309 research outputs found
Exercise Induced Non-Sustained Ventricular Tachycardia and Indication for Invasive Management
Diagnostic stress echo testing is commonly performed in patients with known or suspected cardiovascular disease. There has been considerable debate in management of exercise induced non-sustained ventricular tachycardia (NSVT). In this case report, we present our experience with a case of exercise induced NSVT, and subsequent angiographically significant left anterior descending (LAD) coronary artery lesion
Theory of Luminescent Emission in Nanocrystal ZnS:Mn with an Extra Electron
We consider the effect of an extra electron injected into a doped quantum dot
. The Coulomb interaction and the exchange interaction between the
extra electron and the states of the Mn ion will mix the wavefunctions, split
the impurity energy levels, break the previous selection rules and change the
transition probabilities. Using this model of an extra electron in the doped
quantum dot, we calculated the energy and the wavefunctions, the luminescence
probability and the transition lifetime and compare with the experiments. Our
calculation shows that two orders of magnitudes of lifetime shortening can
occur in the transition when an extra electron is present.Comment: 15 pages, 2 Figs No change in Fig
Integral geometry of complex space forms
We show how Alesker's theory of valuations on manifolds gives rise to an
algebraic picture of the integral geometry of any Riemannian isotropic space.
We then apply this method to give a thorough account of the integral geometry
of the complex space forms, i.e. complex projective space, complex hyperbolic
space and complex euclidean space. In particular, we compute the family of
kinematic formulas for invariant valuations and invariant curvature measures in
these spaces. In addition to new and more efficient framings of the tube
formulas of Gray and the kinematic formulas of Shifrin, this approach yields a
new formula expressing the volumes of the tubes about a totally real
submanifold in terms of its intrinsic Riemannian structure. We also show by
direct calculation that the Lipschitz-Killing valuations stabilize the subspace
of invariant angular curvature measures, suggesting the possibility that a
similar phenomenon holds for all Riemannian manifolds. We conclude with a
number of open questions and conjectures.Comment: 68 pages; minor change
Modulational Instability in Equations of KdV Type
It is a matter of experience that nonlinear waves in dispersive media,
propagating primarily in one direction, may appear periodic in small space and
time scales, but their characteristics --- amplitude, phase, wave number, etc.
--- slowly vary in large space and time scales. In the 1970's, Whitham
developed an asymptotic (WKB) method to study the effects of small
"modulations" on nonlinear periodic wave trains. Since then, there has been a
great deal of work aiming at rigorously justifying the predictions from
Whitham's formal theory. We discuss recent advances in the mathematical
understanding of the dynamics, in particular, the instability of slowly
modulated wave trains for nonlinear dispersive equations of KdV type.Comment: 40 pages. To appear in upcoming title in Lecture Notes in Physic
A qualitative exploration of mental health professionals' experience of working with survivors of trauma in Sri Lanka
This study explored the struggles and rewards of trauma work and the notion that individuals are changed in some way by the work they do with survivors of traumatic events. Interpretative phenomenological analysis of interviews with twelve mental health professionals working in Sri Lanka has shown these changes to have both an accumulated negative emotional impact but also to simultaneously contain positive, growth-promoting and personally satisfying aspects. There is a bias prevalent in the trauma literature towards focusing on the many negative aspects of the impact of working with survivors of trauma or surveying the moderating factors for managing secondary trauma. The present research, instead, uses the paradigm of adversarial growth to demonstrate that when mental health professionals rebuild their assumptive world in light of their experiences of working with survivors of trauma there are valuable opportunities for personal, and by implication, professional growth. This study is of a qualitative nature
and explores phenomenologically grounded knowledge seeking to gain an understanding of the lived experiences reported by mental health professionals working with survivors of trauma, and the subjective and collective meanings that shape these experiences
Scaled limit and rate of convergence for the largest eigenvalue from the generalized Cauchy random matrix ensemble
In this paper, we are interested in the asymptotic properties for the largest
eigenvalue of the Hermitian random matrix ensemble, called the Generalized
Cauchy ensemble , whose eigenvalues PDF is given by
where is a complex number such
that and where is the size of the matrix ensemble. Using
results by Borodin and Olshanski \cite{Borodin-Olshanski}, we first prove that
for this ensemble, the largest eigenvalue divided by converges in law to
some probability distribution for all such that . Using
results by Forrester and Witte \cite{Forrester-Witte2} on the distribution of
the largest eigenvalue for fixed , we also express the limiting probability
distribution in terms of some non-linear second order differential equation.
Eventually, we show that the convergence of the probability distribution
function of the re-scaled largest eigenvalue to the limiting one is at least of
order .Comment: Minor changes in this version. Added references. To appear in Journal
of Statistical Physic
Cognitive endpoints for therapy development for neuronopathic mucopolysaccharidoses: Results of a consensus procedure
The design and conduct of clinical studies to evaluate the effects of novel therapies on central nervous system manifestations in children with neuronopathic mucopolysaccharidoses is challenging. Owing to the rarity of these disorders, multinational studies are often needed to recruit enough patients to provide meaningful data and statistical power. This can make the consistent collection of reliable data across study sites difficult. To address these challenges, an International MPS Consensus Conference for Cognitive Endpoints was convened to discuss approaches for evaluating cognitive and adaptive function in patients with mucopolysaccharidoses. The goal was to develop a consensus on best practice for the design and conduct of clinical studies investigating novel therapies for these conditions, with particular focus on the most appropriate outcome measures for cognitive function and adaptive behavior. The outcomes from the consensus panel discussion are reported here
On the nature of Bose-Einstein condensation in disordered systems
We study the perfect Bose gas in random external potentials and show that
there is generalized Bose-Einstein condensation in the random eigenstates if
and only if the same occurs in the one-particle kinetic-energy eigenstates,
which corresponds to the generalized condensation of the free Bose gas.
Moreover, we prove that the amounts of both condensate densities are equal. Our
method is based on the derivation of an explicit formula for the occupation
measure in the one-body kinetic-energy eigenstates which describes the
repartition of particles among these non-random states. This technique can be
adapted to re-examine the properties of the perfect Bose gas in the presence of
weak (scaled) non-random potentials, for which we establish similar results
Negotiating sacred roles:a sociological exploration of priests who are mothers
In 1992, in a historic move, the Church of England voted to allow women's ordination to priesthood and in 1994 the first women priests started to be ordained. Despite much research interest, the experiences of priests who are mothers to dependent children have been minimally investigated. Based on in-depth interviews with seventeen mothers ordained in the Church, this paper will focus on how the sacred-profane boundary is managed. Priests who are mothers have a particular insight into the Church hierarchy as they symbolically straddle the competing discourses of sacred and profane. However, instead of reifying these binaries, the experiences of these women show how such dualisms are challenged and managed in everyday life. Indeed, in terms of experience, ritual, ministry and preaching, priests who are mothers are resisting, recasting and renegotiating sacred terrain in subtle and nuanced ways. Mothers thus not only negotiate the practical and sacramental demands placed on priests, but also illuminate how the sacred domain is regulated and constructed
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