Resonances in one-dimensional Disordered Chain

We study the average density of resonances, $$, in a semi-infinite disordered chain coupled to a perfect lead. The function$$ is defined in the complex energy plane and the distance $y$ from the real axes determines the resonance width. We concentrate on strong disorder and derive the asymptotic behavior of $$ in the limit of small $y$.Comment: latex, 1 eps figure, 9 pages; v2 - final version, published in the JPhysA Special Issue Dedicated to the Physics of Non-Hermitian Operator

Transition from Poisson to gaussian unitary statistics: The two-point correlation function

We consider the Rosenzweig-Porter model of random matrix which interpolates between Poisson and gaussian unitary statistics and compute exactly the two-point correlation function. Asymptotic formulas for this function are given near the Poisson and gaussian limit.Comment: 19 pages, no figure

Sensitivity of double resonance alignment magnetometers

We present an experimental study of the intrinsic magnetometric sensitivity of an optical/rf-frequency double resonance magnetometer in which linearly polarized laser light is used in the optical pumping and detection processes. We show that a semi-empirical model of the magnetometer can be used to describe the magnetic resonance spectra. Then, we present an efficient method to predict the optimum operating point of the magnetometer, i.e., the light power and rf Rabi frequency providing maximum magnetometric sensitivity. Finally, we apply the method to investigate the evolution of the optimum operating point with temperature. The method is very efficient to determine relaxation rates and thus allowed us to determine the three collisional disalignment cross sections for the components of the alignment tensor. Both first and second harmonic signals from the magnetometer are considered and compared

Structure factor and dynamics of the helix-coil transition

Thermodynamical properties of the helix-coil transition were successfully described in the past by the model of Lifson, Poland and Sheraga. Here we compute the corresponding structure factor and show that it possesses a universal scaling behavior near the transition point, even when the transition is of first order. Moreover, we introduce a dynamical version of this model, that we solve numerically. A Langevin equation is also proposed to describe the dynamics of the density of hydrogen bonds. Analytical solution of this equation shows dynamical scaling near the critical temperature and predicts a gelation phenomenon above the critical temperature. In the case when comparison of the two dynamical approaches is possible, the predictions of our phenomenological theory agree with the results of the Monte Carlo simulations.Comment: 11 pages, 7 figure

Status report of the CMS superconducting coil project

The CMS superconducting coil is designed for one of the two large experiments of LHC at CERN. This coil 12.5 m long, 6 m diameter and 2.7 GJ stored energy is a common project of the CMS Collaboration. It is a four-layer coil, equipped with a self-supporting conductor capable of carrying 20 kA to reach the maximum potential field of 4 T. It has been designed with a considerable contribution from CEA- Saclay for the engineering, ETH-Zurich for the conductor, INFN-Genova for the winding and CERN for the general coordination and construction of the ancillaries. The project entered the construction phase one year ago. The civil engineering is well advanced and ready to accept part of the yoke components already built. The coil itself has finished the pre-industrialization phase and the construction is beginning in industry. Most of the important contracts have been awarded and the foreseen schedule is now based on contractual engagements. A quick overview of the features of the project as well as a status report of the main activities are given. (6 refs)

Mobilisation Du Foncier Au Profit Des Investissements Immobiliers Publics Dans La Commune D’Abomey-Calavi

Pour faire face à l’évolution démographique et à l’augmentation de la demande de logement dans la ville d’Abomey-Calavi, l’Etat Béninois a initié de nombreux projets de construction de logements économiques au profit des ménages. La présente recherche vise à analyser les stratégies de mobilisation du foncier au profit de ces investissements. La méthodologie de recherche s’est basée sur les recherches documentaires, la collecte de données auprès de 113 personnes par entretien et questionnaire, le traitement de ces données et l’analyse des résultats par le biais du modèle SWOT ou FFOM (Forces, Faiblesses, Opportunités et Menaces).Les résultats obtenus montrent que deux principales stratégies sont utilisées par les autorités pour mobiliser le foncier pour la  construction de logements sociaux.  Il s’agit de la constitution de réserves administratives à l’issue des opérations de lotissement  et de l’expropriation foncière pour cause d’utilité publique.  Au total, 539 réserves administratives ont été constituées dans la Commune d’Abomey-Calavi et environ 3 457 ha de domaines ont été expropriés au profit des programmes immobiliers. Trente-deux (32) logements de type F2, soixante-quinze (75) logements de type F3 et quarante-cinq (45) logements de type F4 ont été construits sur le site de la Zopah à Abomey-Calavi en 2008. De même, il est prévu la construction de 200 logements de type F2, 500 logements de type F3 et 300 logements de type F4 sur un premier site  dans l’Arrondissement de Ouèdo.  Sur un second site du même arrondissement, 8900 logements sont en cours de construction dont 3035 sont pratiquement achevés.  Malgré ces efforts en termes d’investissements,  les ménages font évoquent  des insuffisances qui ne facilitent pas un accès équitable et juste  auxdits logements. . Pour 75% des personnes interrogées, ces logements seraient trop chers ; 20% trouvent que ces logements sont exigus, et 5% trouvent que leurs plans architecturaux ne conviennent pas aux besoins des ménages. Il paraît donc  important que les autorités publiques travaillent davantage à l’ancrage socio-économique de ces logements pour faciliter leur acquisition et leur occupation par les ménages

Politicas agrarias y estrategias campesinas en la Cuenca del Canete : anexos 8 a 13

Ce document réunit plusieurs diagnostics établis à partir d'observations de terrain sur la géographie physique, l'organisation sociale, les pratiques paysannes dans la vallée de Canete et la vallée Pampas afin de déterminer les facteurs limitants de la production et des pratiques culturales , notamment en matière d'irrigation

Alcohol-related adverse consequences: cross-cultural variations in attribution process among young adults

Background: Social norms around what is culturally accepted in terms of alcohol consumption and drunken comportment appear important regarding the acceptance of alcohol-related adverse consequences; however, investigations often neglect to consider differences in terms of attribution. This study aims at assessing cross-cultural differences in the reporting of alcohol-related adverse consequences. It also considers differences across consequences that might explain which type of consequences (mainly acute or mainly chronic) are most affected by an attribution process. Methods: Conditional regression models were estimated based on data from eight European countries participating in the Gender, Alcohol and Culture—An International Study (GENACIS) project. Cases were matched to controls based on usual drinking patterns in order to control for average volume of alcohol and frequency of ‘risky single occasion drinking' (RSOD). Results: Differences among the patterns of associations between countries and consequences were evident. The distinction between Nordic and other European countries was persistent. A higher variability of associations was observed for some consequences, namely the mainly acute instances. Finally, the Isle of Man and Switzerland showed specific trends with associations across consequences. Conclusion: Reporting of alcohol-related adverse consequences seemed strongly affected by cultural norms. The latter may be exemplified by viewing drinking as ‘time-out' behaviour. Respondents in countries with a stereotypical history of being ‘dry' or with a stereotyped ‘binge' drinking culture were more likely to attribute consequences to their alcohol consumption than people in ‘wet' countries. This was particularly true for consequences that related to episodic ‘time-out' heavy drinkin

Measurement of the CMS Magnetic Field

The measurement of the magnetic field in the tracking volume inside the superconducting coil of the Compact Muon Solenoid (CMS) detector under construction at CERN is done with a fieldmapper designed and produced at Fermilab. The fieldmapper uses 10 3-D B-sensors (Hall probes) developed at NIKHEF and calibrated at CERN to precision 0.05% for a nominal 4 T field. The precise fieldmapper measurements are done in 33840 points inside a cylinder of 1.724 m radius and 7 m long at central fields of 2, 3, 3.5, 3.8, and 4 T. Three components of the magnetic flux density at the CMS coil maximum excitation and the remanent fields on the steel-air interface after discharge of the coil are measured in check-points with 95 3-D B-sensors located near the magnetic flux return yoke elements. Voltages induced in 22 flux-loops made of 405-turn installed on selected segments of the yoke are sampled online during the entire fast discharge (190 s time-constant) of the CMS coil and integrated offline to provide a measurement of the initial magnetic flux density in steel at the maximum field to an accuracy of a few percent. The results of the measurements made at 4 T are reported and compared with a three-dimensional model of the CMS magnet system calculated with TOSCA.Comment: 4 pages, 5 figures, 15 reference