Sign reversals of the Quantum Hall Effect in quasi-1D conductors

The sign reversals of the Quantum Hall Effect observed in quasi-one-dimensional conductors of the Bechgaard salts family are explained within the framework of the quantized nesting model. The sequence of reversals is driven by slight modifications of the geometry of the Fermi surface. It is explained why only even phases can have signign reversals and why negative phases are less stable than positive ones.Comment: 4 LaTex pages, 3 Postscript figure

The Other in the Soul

Most of Freud’s readers take it for granted that the question of the relation to others is completely neglected by Freudian psychology. Whereas his clinical accounts of pathological cases thoroughly relate the complex bonds that the patient weaves with others, Freud, through his metapsychological views, seems to propound an ego-focused conception: whatever the subject experiences, it stands for an inner event in a lonely self-regulated system. Taking issue with this conception, I point out that Freud has always thought the mind as an open entity which is essentially involved in exchanges with others. Based on the poorly-known developments of the posthumous publication Entwurf einer Psychologie (1895), the article begins to consider drives not as organic functions, but as claims addressed to somebody. It then refutes two common objections against the supposed Freudian solipsism, excerpted from Laplanche’s works. In its conclusion, the article outlines the philosophical stakes of Freudian thought understood as a relationa

Le primat de l'autre dans la pensée Freudienne (théorie de la névrose et névrose dans la théorie)

PARIS7-Bibliothèque centrale (751132105) / SudocSudocFranceF

Natural history of spasticity in a case of a novel RAB3GAP2 mutation: Gait analysis with cortico-spinal tract imaging

International audienc

Medical student engagement in a massive COVID-19-screening programme

International audienc

Limited evidence of physical therapy on balance after stroke: A systematic review and meta-analysis.

BackgroundStroke results in balance disorders and these directly affect autonomy and quality of life. The purpose of this systematic review and meta-analysis was to determine the efficacy of physical therapy (PT) on balance and postural control after stroke.MethodsWe included all randomized controlled trials assessing the efficacy of PT on balance and postural control in adult patients after stroke without language restriction. Medline, Embase/Scopus, Cochrane Central Register of Controlled Trials, PEDro, Pascal, and Francis databases were searched until January 2019. Primary outcomes were balance (Berg Balance scale and Postural Assessment Scale for Stroke) and postural control with postural deviation or stability measurement in sitting or standing static evaluation. A pair of independent reviewers selected studies, extracted data, and assessed risk of bias. Meta-analyses with subgroups (categories of PT, time post-stroke, and lesion location) and meta-regression (duration of PT) were conducted.ResultsA total of 145 studies (n = 5912) were selected from the 13,123 records identified. For balance, evidence was found in favor of the efficacy of functional task-training alone (standardized mean difference 0.39, 95% confidence interval [0.09; 0.68], heterogeneity I2 = 63%) or associated with musculoskeletal intervention and/or cardiopulmonary intervention (0.37, [0.19; 0.55], I2 = 48%), electrostimulation (0.91, [0.49; 1.34], I2 = 52%) immediately after intervention, compared to sham treatment or usual care (ST/UC). For postural deviation eyes open, assistive devices were more effective than no treatment (-0.21, [-0.37; -0.05], I2 = 0%) immediately after intervention; for postural stability eyes open, functional task-training and sensory interventions were more effective than ST/UC (0.97, [0.35; 1.59], I2 = 65% and 0.80, [0.46; 1.13], I2 = 37% respectively) immediately after intervention.ConclusionsFunctional task-training associated with musculoskeletal intervention and/or cardiopulmonary intervention and sensory interventions seem to be immediately effective in improving balance and postural stability, respectively. The heterogeneity of PT and the weak methodological quality of studies limited the interpretation and the confidence in findings

Pigments et colorants de l’Antiquité et du Moyen Âge

Quelle est la couleur d'une robe lorsqu'une personne ne la regarde ? Qu'elle soit domestiquée par l'homme ou elle "pense par elle-même", comme l'écrivait Baudelaire, la couleur reflète toujours les regards et les préoccupations des sociétés qui l'ont produite et utilisée. Depuis longtemps, les historiens de l'art, en nous faisant pénétrer dans le champs de vision du peintre, nous ont ainsi appris à en découvrir l'environnement économique, social, culturel, idéologique et symbolique. Aujourd'hui, le développement de nouvelles techniques - détection optique instrumentale et scanner, spectrométries électronique et vibrationnelle, imagerie et fausses couleurs - a changé le concept même de la couleur. Les recherches des historiens de l'art sont désormais confrontées aux investigations des archéologues, des chimistes, des physiciens, des linguistes et des informaticiens. La formule chimique identifiant un cristal coloré côtoie le lexique du philologue, le programme de l'ordinateur, la grille du sociologue et la vision subjective du peintre. Tous ces regards différents, toutes ces techniques élargies et sans cesse renouvelées nécessitent une appréhension neuve des peintures et des teintures que les siècles, parfois les millénaires, nous ont transmises