État des lieux de la psychiatrie de liaison à l'hôpital de l'enfance

Ce travail vise à déterminer s'il existe des différences de profil entre les patients garçons et filles au sein d'une population de patients pédiatriques qui ont nécessité de l'intervention de l'équipe de pédopsychiatrie à la suite d'une consultation aux Urgences somatiques de l’Hôpital de l’Enfance (HEL). Les données qui ont été utilisées dans le cadre de l'étude ont été extraites des lettres de sortie de 661 patients qui ont consulté entre le 01.01.2013 et le 28.12.2015. Nous avons pu observer et confirmer statistiquement qu’un certain nombre des paramètres étudiés1 sont associés de façon préférentielle à un sexe en particulier, ce qui nous a permis de conclure que le profil du patient garçon et celui du patient fille ne sont pas les mêmes, dans ce contexte particulier. Concernant le diagnostic, par exemple, on a relevé que les ‘’troubles des conduites et des impulsions’’ sont majoritairement lié aux garçons alors que les troubles dépressifs aux filles. Tout au long de l’étude, aussi grâce à trois modèles explicatifs (‘’modèle biologique’’, ’’modèle social-développemental’’, ‘’social constructionis theory’’) retrouvés dans la littérature, on a mené une réflexion concernant les raisons qui conduisent à associer naturellement certains traits de caractère mais aussi certaines pathologies psychiatriques à un sexe plutôt que à l’autre

Renormalization group trajectories from resonance factorized S-matrices

We propose and investigate a large class of models possessing resonance factorized S-matrices. The associated Casimir energy describes a rich pattern of renormalization group trajectories related to flows in the coset models based on the simply laced Lie Algebras. From a simplest resonance S-matrix, satisfying the ``$\phi^3$-property'', we predict new flows in non-unitary minimal models.Comment: (7 pages) (no figures included

Vaginal deliveries in a tertiary centre: a current profile

Background: A normal delivery is what every woman wishes to have. The objective of this study was to find out the maternal and neonatal outcome and background characteristics of women delivering vaginally in a tertiary care center in Chennai, South India.Methods: For this one-year study, with power above 80%, Parturition records were selected by computerized random numbers, for a calculated sample size. Salient demographic features such as age, residential background and religion were noted. Details of obstetric history, past and current, delivery and baby details and admission to NICU were analyzed. Acceptance of postpartum contraception was noted.Results: A total of 338 women delivered vaginally. Majority of 63%, were from urban background. Late referrals were 19.2% of women,38.5% women had antenatal complications. Primigravida were 49.7%. Nearly 91.4% of women delivered naturally. Previous pregnancy loss was noted in 14.8%. Term deliveries were in 72% of women, and 2.7% of women delivered twins. Average birth weight among primi was 2.5kg and in multi it was 2.8 kg. There were no maternal deaths. Perinatal deaths of 2.96%, of which 90% were preterm births, and all among babies with birth weight below 1.5 kg.Conclusions: The larger majority of 91.4% of women had natural vaginal delivery. Primigravida were 49.7%, and 63% were from urban background. Antenatal complications, obstetric, medical or other complications were noted in 38.5 % of women. Most often observed complications were Gestational hypertension, Gestational diabetes, and Hypothyroidism. NICU care was required for 18% of babies. Preterm births were16.6%. Perinatal deaths were seen in 2.96% of babies. There were no maternal deaths

Universal amplitude ratios and Coxeter geometry in the dilute A model

The leading excitations of the dilute $A_L$ model in regime 2 are considered using analytic arguments. The model can be identified with the integrable $\phi_{1,2}$ perturbation of the unitary minimal series $M_{L,L+1}$. It is demonstrated that the excitation spectrum of the transfer matrix satisfies the same functional equations in terms of elliptic functions as the exact S-matrices of the $\phi_{1,2}$ perturbation do in terms of trigonometric functions. In particular, the bootstrap equation corresponding to a self-fusing process is recovered. For the special cases $L=3,4,6$ corresponding to the Ising model in a magnetic field, and the leading thermal perturbations of the tricritical Ising and three-state Potts model, as well as for the unrestricted model, $L=\infty$, we relate the structure of the Bethe roots to the Lie algebras $E_{8,7,6}$ and $D_4$ using Coxeter geometry. In these cases Coxeter geometry also allows for a single formula in generic Lie algebraic terms describing all four cases. For general $L$ we calculate the spectral gaps associated with the leading excitation which allows us to compute universal amplitude ratios characteristic of the universality class. The ratios are of field theoretic importance as they enter the bulk vacuum expectation value of the energy momentum tensor associated with the corresponding integrable quantum field theories.Comment: 32 pages (tcilatex

The Thermal Properties of Solar Flares Over Three Solar Cycles Using GOES X-ray Observations

Solar flare X-ray emission results from rapidly increasing temperatures and emission measures in flaring active region loops. To date, observations from the X-Ray Sensor (XRS) onboard the Geostationary Operational Environmental Satellite (GOES) have been used to derive these properties, but have been limited by a number of factors, including the lack of a consistent background subtraction method capable of being automatically applied to large numbers of flares. In this paper, we describe an automated temperature and emission measure-based background subtraction method (TEBBS), which builds on the methods of Bornmann (1990). Our algorithm ensures that the derived temperature is always greater than the instrumental limit and the pre-flare background temperature, and that the temperature and emission measure are increasing during the flare rise phase. Additionally, TEBBS utilizes the improved estimates of GOES temperatures and emission measures from White et al. (2005). TEBBS was successfully applied to over 50,000 solar flares occurring over nearly three solar cycles (1980-2007), and used to create an extensive catalog of the solar flare thermal properties. We confirm that the peak emission measure and total radiative losses scale with background subtracted GOES X-ray flux as power-laws, while the peak temperature scales logarithmically. As expected, the peak emission measure shows an increasing trend with peak temperature, although the total radiative losses do not. While these results are comparable to previous studies, we find that flares of a given GOES class have lower peak temperatures and higher peak emission measures than previously reported. The resulting TEBBS database of thermal flare plasma properties is publicly available on Solar Monitor (www.solarmonitor.org/TEBBS/) and will be available on Heliophysics Integrated Observatory (www.helio-vo.eu)

Solar Flare Impulsive Phase Observations from SDO and Other Observatories

With the start of normal operations of the Solar Dynamics Observatory in May 2010, the Extreme ultraviolet Variability Experiment (EVE) and the Atmospheric Imaging Assembly (AIA) have been returning the most accurate solar XUV and EUV measurements every 10 and 12 seconds, respectively, at almost 100% duty cycle. The focus of the presentation will be the solar flare impulsive phase observations provided by EVE and AIA and what these observations can tell us about the evolution of the initial phase of solar flares. Also emphasized throughout is how simultaneous observations with other instruments, such as RHESSI, SOHO-CDS, and HINODE-EIS, will help provide a more complete characterization of the solar flares and the evolution and energetics during the impulsive phase. These co-temporal observations from the other solar instruments can provide information such as extending the high temperature range spectra and images beyond that provided by the EUV and XUV wavelengths, provide electron density input into the lower atmosphere at the footpoints, and provide plasma flows of chromospheric evaporation, among other characteristics

Finite-Size Scaling and Universality in the Spin 1 Quantum XY Chain

The spin-1 XY chain in a transverse field is studied using finite-size scaling. The ground state phase diagram displays a paramagnetic, an ordered ferromagnetic and an ordered oscillatory phase. The paramagnetic-ferromagnetic transition line belongs to the universality class of the 2D Ising model. Along this line, universality is confirmed for the finite-size scaling functions of several correlation lengths and for the conformal operator content.Comment: Latex 8 pages, 2 uucompressed figure

Low-Temperature Expansions and Correlation Functions of the Z_3-Chiral Potts Model

Using perturbative methods we derive new results for the spectrum and correlation functions of the general Z_3-chiral Potts quantum chain in the massive low-temperature phase. Explicit calculations of the ground state energy and the first excitations in the zero momentum sector give excellent approximations and confirm the general statement that the spectrum in the low-temperature phase of general Z_n-spin quantum chains is identical to one in the high-temperature phase where the role of charge and boundary conditions are interchanged. Using a perturbative expansion of the ground state for the Z_3 model we are able to gain some insight in correlation functions. We argue that they might be oscillating and give estimates for the oscillation length as well as the correlation length.Comment: 17 pages (Plain TeX), BONN-HE-93-1

The ultraviolet Behaviour of Integrable Quantum Field Theories, Affine Toda Field Theory

We investigate the thermodynamic Bethe ansatz (TBA) equations for a system of particles which dynamically interacts via the scattering matrix of affine Toda field theory and whose statistical interaction is of a general Haldane type. Up to the first leading order, we provide general approximated analytical expressions for the solutions of these equations from which we derive general formulae for the ultraviolet scaling functions for theories in which the underlying Lie algebra is simply laced. For several explicit models we compare the quality of the approximated analytical solutions against the numerical solutions. We address the question of existence and uniqueness of the solutions of the TBA-equations, derive precise error estimates and determine the rate of convergence for the applied numerical procedure. A general expression for the Fourier transformed kernels of the TBA-equations allows to derive the related Y-systems and a reformulation of the equations into a universal form.Comment: 37 pp Latex, 5 figure

Finite temperature bosonization

Finite temperature properties of a non-Fermi liquid system is one of the most challenging probelms in current understanding of strongly correlated electron systems. The paradigmatic arena for studying non-Fermi liquids is in one dimension, where the concept of a Luttinger liquid has arisen. The existence of a critical point at zero temperature in one dimensional systems, and the fact that experiments are all undertaken at finite temperature, implies a need for these one dimensional systems to be examined at finite temperature. Accordingly, we extended the well-known bosonization method of one dimensional electron systems to finite temperatures. We have used this new bosonization method to calculate finite temperature asymptotic correlation functions for linear fermions, the Tomonaga-Luttinger model, and the Hubbard model.Comment: REVTex, 48 page