3,632 research outputs found
La Maison St-Jacques, un centre d’intervention alternatif en santé mentale
La Maison St-Jacques a été fondée en 1972 pour fournir un gîte d’urgence à des jeunes. En 1975-76, les thérapeutes ont postulé que les problèmes mentaux émergeaient directement des relations sociales et de leurs contradictions. Dès lors, le but était de transformer la situation objective des jeunes adultes (18-30 ans) en intervenant individuellement et en groupe, dans leur réalité quotidienne. Huit de ces jeunes qui utilisent ces services y vivent. Il y a une variété d’activités de groupe : ménage, loisir, travail, réunion, etc. L’équipe de travail est composée de 15 employés dont le but ultime est l’autonomie sociale du jeune adulte.The Maison St-Jacques was founded in 1972 to provide emergency shelter for local youth. In 1975-1976 the therapists postulated that mental problems stem directly from social relations and their contradictions. Henceforth, their aim was to transform the objective situation of young adults (age 18 to 30) by intervening both individually and in groups, in their daily reality. Eight of the young people using the service, live in. There are a variety of group activities : household chores, recreations, work, meetings, etc. The work group is composed of 15 staff members whose ultimate goal is the social autonomy of the young adult
The Ernst Equation on a Riemann Surface
The Ernst equation is formulated on an arbitrary Riemann surface.
Analytically, the problem reduces to finding solutions of the ordinary Ernst
equation which are periodic along the symmetry axis. The family of (punctured)
Riemann surfaces admitting a non-trivial Ernst field constitutes a ``partially
discretized'' subspace of the usual moduli space. The method allows us to
construct new exact solutions of Einstein's equations in vacuo with non-trivial
topology, such that different ``universes'', each of which may have several
black holes on its symmetry axis, are connected through necks bounded by cosmic
strings. We show how the extra topological degrees of freedom may lead to an
extension of the Geroch group and discuss possible applications to string
theory.Comment: 22 page
214 Gene-specific effect of beta-adrenergic blockade on QT duration in the Long QT syndrome
BackgroundIn the long QT syndrome (LQTS) the clinical efficacy of beta-blocker treatment differs according to the genotype. We aimed to asses the effect of beta-blocker treatment in LQT1 and LQT2 patients.Patients and methods24-hour Holter ECG were recorded before and after beta-blocking therapy initiation in genotyped LQT1 (n=30, 8 males, mean age 21±17) and LQT2 patients (n=16, 8 males, mean age 19±15). QT duration was measured on consecutive 1-minute averaged QRS-T complexes leading to up to 1440 QT-RR pairs for each recording. Then, we computed subject- and condition-specific log/log QT/RR relationships which were used to calculate QT interval duration at RR=1000ms (QT1000=1000*).ResultsBefore treatment, coefficients were higher in LQT2 than in LQT1 patients (0.53±0.10 vs. 0.40±0.11, p<0.001) and QT1000 was longer in LQT2 than in LQT1 patients (521±38 vs. 481±39ms, p<0.01).Beta-blockers significantly prolonged the mean RR interval (RR = 827 ± 161 ms before treatment and 939±197ms on beta-blocker, p<0.0001). The coefficients were not significantly modified by beta-blockers (0.41±0.9 in LQT1 patients and 0.52±0.12 LQT2 patients). Beta-blocker treatment was associated with a prolongation of the QT1000 interval (from 481±39 to 498±43ms, p<0.01) in LQT1 patients but with a shortening in LQT2 patients (from 521±38 to 503±32ms, p<0.01).ConclusionsOur results confirm the elevated coefficient of the QT/RR relationship in LQTS patients. LQT2 patients showed higher coefficient and longer QT1000 when compared to LQT1 patients. The effect of beta-adrenergic blockade on QT1000 duration was gene-specific. Given the demonstrated efficacy of beta-blockers in LQT1 and 2 patients, our data suggest that QT1000 might be a poor predictor of outcome under anti-adrenergic therapy
An Integrable Model of Quantum Gravity
We present a new quantization scheme for gravity coupled to an
principal chiral field and a dilaton; this model represents a slightly
simplified version of stationary axisymmetric quantum gravity. The analysis
makes use of the separation of variables found in our previous work [1] and is
based on a two-time hamiltonian approach. The quantum constraints are shown to
reduce to a pair of compatible first order equations, with the dilaton playing
the role of a ``clock field''. Exact solutions of the Wheeler-DeWitt equation
are constructed via the integral formula for solutions of the
Knizhnik-Zamolodchiokov equations.Comment: 12 page
Two-loop finiteness of D=2 supergravity
We establish two-loop (on shell) finiteness of certain supergravity theories
in two dimensions. Possible implications of this result are discussedComment: 11 page
Galerkin Method in the Gravitational Collapse: a Dynamical System Approach
We study the general dynamics of the spherically symmetric gravitational
collapse of a massless scalar field. We apply the Galerkin projection method to
transform a system of partial differential equations into a set of ordinary
differential equations for modal coefficients, after a convenient truncation
procedure, largely applied to problems of turbulence. In the present case, we
have generated a finite dynamical system that reproduces the essential features
of the dynamics of the gravitational collapse, even for a lower order of
truncation. Each initial condition in the space of modal coefficients
corresponds to a well definite spatial distribution of scalar field. Numerical
experiments with the dynamical system show that depending on the strength of
the scalar field packet, the formation of black-holes or the dispersion of the
scalar field leaving behind flat spacetime are the two main outcomes. We also
found numerical evidence that between both asymptotic states, there is a
critical solution represented by a limit cycle in the modal space with period
.Comment: 9 pages, revtex4, 10 ps figures; Phys. Rev. D, in pres
New Linear Systems for 2D Poincare Supergravities
A new linear system is constructed for Poincar\'e supergravities in two
dimensions. In contrast to previous results, which were based on the conformal
gauge, this linear system involves the topological world sheet degrees of
freedom (the Beltrami and super-Beltrami differentials). The associated
spectral parameter likewise depends on these and is itself subject to a pair of
differential equations, whose integrability condition yields one of the
equations of motion. These results suggest the existence of an extension of the
Geroch group mixing propagating and topological degrees of freedom on the world
sheet. We also develop a chiral tensor formalism for arbitrary Beltrami
differentials, in which the factorization of diffeomorphisms is always
manifest.Comment: 26 pages, report DESY93-12
Classical Symmetries of Some Two-Dimensional Models
It is well-known that principal chiral models and symmetric space models in
two-dimensional Minkowski space have an infinite-dimensional algebra of hidden
symmetries. Because of the relevance of symmetric space models to duality
symmetries in string theory, the hidden symmetries of these models are explored
in some detail. The string theory application requires including coupling to
gravity, supersymmetrization, and quantum effects. However, as a first step,
this paper only considers classical bosonic theories in flat space-time. Even
though the algebra of hidden symmetries of principal chiral models is confirmed
to include a Kac--Moody algebra (or a current algebra on a circle), it is
argued that a better interpretation is provided by a doubled current algebra on
a semi-circle (or line segment). Neither the circle nor the semi-circle bears
any apparent relationship to the physical space. For symmetric space models the
line segment viewpoint is shown to be essential, and special boundary
conditions need to be imposed at the ends. The algebra of hidden symmetries
also includes Virasoro-like generators. For both principal chiral models and
symmetric space models, the hidden symmetry stress tensor is singular at the
ends of the line segment.Comment: 51 pages, minor corrections and added reference
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