Anderson Localization of Expanding Bose-Einstein Condensates in Random Potentials

We show that the expansion of an initially confined interacting 1D Bose-Einstein condensate can exhibit Anderson localization in a weak random potential with correlation length \sigma_R. For speckle potentials the Fourier transform of the correlation function vanishes for momenta k > 2/\sigma_R so that the Lyapunov exponent vanishes in the Born approximation for k > 1/\sigma_R. Then, for the initial healing length of the condensate \xi > \sigma_R the localization is exponential, and for \xi < \sigma_R it changes to algebraic.Comment: published versioon (no significant change compared to last version

Gérer dans la complexité: quels rôles pour les technologies de collaboration?

Un nombre croissant d'organisations évolue au sein d'environnements complexes, marqués par une forte incertitude. Dans de telles conditions, le stratège peut éprouver certaines difficultés à anticiper les évolutions qui pourront affecter l'organisation et à agir afin d'en absorber les effets. Le stratège évoque une catégorie d'acteurs qui contribue à la définition de la stratégie en influençant la construction des pratiques stratégiques. Face à la complexité de leur contexte d'action, les stratèges peuvent percevoir les Technologies de l'Information et de la Communication (TIC) comme des outils d'aide à l'anticipation. L'objectif de cet article est de comprendre comment les usages de technologies particulières, les technologies de collaboration, affectent les capacités d'anticipation et d'adaptation des stratèges. Pour ce faire, nous nous appuyons sur des données recueillies pendant une année dans le cadre d'une étude commandée par le Ministère français de la Défense et analysons l'impact des TIC sur la conduite des opérations militaires centrées réseaux. Plus spécifiquement, nous portons notre attention sur la façon dont les militaires de l'OTAN déployés sur le sol Afghan utilisent les technologies de collaboration du type text chat. L'analyse du cas fait émerger deux résultats principaux. D'une part, les utilisateurs de la technologie articulent certaines propriétés offertes par la technologie au regard de leurs besoins sur le terrain. La relation technologie/usages repose alors sur la combinaison de trois propriétés spécifiques : des fonctions technologiques, des processus cognitifs et des types de connaissance. D'autre part, certains types d'usages combinés peuvent générer des effets non anticipés sur les capacités d'anticipation et d'adaptation des utilisateurs de la technologie. Nos résultats montrent notamment que l'interaction technologie/usages est susceptible de renforcer certaines formes de complexité déjà présentes dans l'environnement, voire d'en créer de nouvelles (comme la surcharge informationnelle ou encore les biais perceptifs et interprétatifs). Dans la discussion, nous insistons sur le fait la relation technologie/usages n'est ni univoque, ni déterministe et que l'organisation peut obtenir un avantage stratégique en développant des compétences à partir des combinaisons d'usages mises en œuvre par les acteurs sur le terrain. L'enjeu pour le stratège est alors de trouver un équilibre entre contrôle des usages, maîtrise des effets non anticipés et incitations à l'expérimentation et à l'énaction de la technologie.combinaison, complexité, connaissance, technologie, usage

Hipercolesterolemia e hipertrigliceridemia como factores asociados a miomatosis uterina en pacientes del hospital regional docente de Trujillo

Determinar si la hipercolesterolemia e hipertrigliceridemia son factores asociados a miomatosis uterina en pacientes del Hospital Regional Docente de Trujillo. Material y Métodos: Se llevó a cabo un estudio de tipo analítico, observacional, retrospectivo de casos y controles. La población de estudio estuvo constituida por 276 pacientes, las cuales fueron divididas en 2 grupos: con miomatosis uterina o sin miomatosis uterina; se calculó el odds ratio y la prueba chi cuadrado. Resultados: La frecuencia de hipercolesterolemia en pacientes con o sin miomatosis uterina fue de 19% y 9% respectivamente. La hipercolesterolemia es factor asociado a miomatosis uterina con un odds ratio de 2.38 el cual fue significativo (p<0.05). La frecuencia de hipertrigliceridemia en pacientes con o sin miomatosis uterina fue de 25% y 14% respectivamente. La hipertrigliceridemia es factor asociado a miomatosis uterina con un odds ratio de 2.12 el cual fue significativo (p<0.05). Conclusiones: La hipercolesterolemia e hipertrigliceridemia son factores asociados a miomatosis uterina en pacientes del Hospital Regional Docente de Trujillo.To determine if hypercholesterolemia and hypertriglyceridemia are factors associated with uterine myomatosis in patients of the Regional Teaching Hospital of Trujillo. Material and Methods: An analytical, observational, retrospective casecontrol study was conducted. The study population consisted of 276 patients, which were divided into 2 groups: with uterine myomatosis or without uterine myomatosis; The odds ratio and chi-square test were calculated. Results: The frequency of hypercholesterolemia in patients with or without uterine myomatosis was 19% and 9%, respectively. Hypercholesterolemia is a factor associated with uterine myomatosis with an odds ratio of 2.38 which was significant (p <0.05). The frequency of hypertriglyceridemia in patients with or without uterine myomatosis was 25% and 14%, respectively. Hypertriglyceridemia is a factor associated with uterine myomatosis with an odds ratio of 2.12 which was significant (p <0.05). Conclusions: Hypercholesterolemia and hypertriglyceridemia are factors associated with uterine myomatosis in patients at the Regional Teaching Hospital of Trujillo

Likelihood and Bayesian analyses reveal major genes affecting body composition, carcass, meat quality and the number of false teats in a Chinese European pig line

Segregation analyses were performed using both maximum likelihood – via a Quasi Newton algorithm – (ML-QN) and Bayesian – via Gibbs sampling – (Bayesian-GS) approaches in the Chinese European Tiameslan pig line. Major genes were searched for average ultrasonic backfat thickness (ABT), carcass fat (X2 and X4) and lean (X5) depths, days from 20 to 100 kg (D20100), Napole technological yield (NTY), number of false (FTN) and good (GTN) teats, as well as total teat number (TTN). The discrete nature of FTN was additionally considered using a threshold model under ML methodology. The results obtained with both methods consistently suggested the presence of major genes affecting ABT, X2, NTY, GTN and FTN. Major genes were also suggested for X4 and X5 using ML-QN, but not the Bayesian-GS, approach. The major gene affecting FTN was confirmed using the threshold model. Genetic correlations as well as gene effect and genotype frequency estimates suggested the presence of four different major genes. The first gene would affect fatness traits (ABT, X2 and X4), the second one a leanness trait (X5), the third one NTY and the last one GTN and FTN. Genotype frequencies of breeding animals and their evolution over time were consistent with the selection performed in the Tiameslan line

Identification of emotions in mixed disgusted-happy faces as a function of depressive symptom severity

Interpersonal difficulties are common in depression, but their underlying mechanisms are not yet fully understood. The role of depression in the identification of mixed emotional signals with a direct interpersonal value remains unclear. The present study aimed to clarify this question. A sample of 39 individuals reporting a broad range of depression levels completed an emotion identification task where they viewed faces expressing three emotional categories (100% disgusted and 100% happy faces, as well as their morphed 50% disgusted - 50% happy exemplars). Participants were asked to identify the corresponding depicted emotion as "clearly disgusted", "mixed", or "clearly happy". Higher depression levels were associated with lower identification of positive emotions in 50% disgusted - 50% happy faces. The study was conducted with an analogue sample reporting individual differences in subclinical depression levels. Further research must replicate these findings in a clinical sample and clarify whether differential emotional identification patterns emerge in depression for different mixed negative-positive emotions (sad-happy vs. disgusted-happy). Depression may account for a lower bias to perceive positive states when ambiguous states from others include subtle signals of social threat (i.e., disgust), leading to an under-perception of positive social signals