Commensurate and modulated magnetic phases in orthorhombic A1C60

Competing magnetically ordered structures in polymerized orthorhombic A1C60 are studied. A mean-field theory for the equilibrium phases is developed using an Ising model and a classical Heisenberg model to describe the competition between inter- and intra-chain magnetic order in the solid. In the Ising model, the limiting commensurate one-dimensional and three-dimensional phases are separated by a commensurate three-sublattice state and by two sectors containing higher-order commensurate phases. For the Heisenberg model the quasi-1D phase is never the equilibrium state; instead the 3D commensurate phases exhibits a transition to a continuum of coplanar spiral magnetic phases.Comment: 11 pages REVTeX 3.0 plus 4 figures appende

Eurosibs: towards robust measurement of infant neurocognitive predictors of Autism across Europe

Autism Spectrum Disorder (ASD) is a neurodevelopmental disorder that affects social communication skills and flexible behaviour. Developing new treatment approaches for ASD requires early identification of the factors that influence later behavioural outcomes. One fruitful research paradigm has been the prospective study of infants with a first degree relative with ASD, who have around a 20% likelihood of developing ASD themselves. Early findings have identified a range of candidate neurocognitive markers for later ASD such as delayed attention shifting or neural responses to faces, but given the early stage of the field most sample sizes are small and replication attempts remain rare. The Eurosibs consortium is a European multisite neurocognitive study of infants with an older sibling with ASD conducted across nine sites in five European countries. In this manuscript, we describe the selection and standardization of our common neurocognitive testing protocol. We report data quality assessments across sites, showing that neurocognitive measures hold great promise for cross-site consistency in diverse populations. We discuss our approach to ensuring robust data analysis pipelines and boosting future reproducibility. Finally, we summarise challenges and opportunities for future multi-site research efforts

Methodology and tool for object oriented database design

International audienc

ALECSI : an Expert System for Requirements Engineering

International audienc

Genetic differentiation in Scriptaphyosemion geryi (Lambert, 1958) suggests the existence of a species complex

Scriptaphyosemion geryi (Lambert, 1958) is a well-defined taxa easily distinguished from the other congeneric species by a red marbled pattern, unpaired fins with deep blue blotches, blue margin and red submargin. A zigzag mid longitudinal dark line on sides characterizes females. For long, due to a high phenotypic variability, this taxa was suspected to encompass several cryptic species. We sampled 20 populations representing the entire species range and characterized the genotypes (cytochrome b, mitochondrial DNA) of their specimens. Results allowed grouping populations in five clusters composed of geographically-linked populations. Compared with those observed in other species from the subgenus Chromaphyosemion (Radda, 1971), all these results strongly suggested that S. geryi encompassed five different species

Représentation des connaissances pour la conception des systèmes d'information

National audienc