Current-driven magnetization decrease in single crystalline ferromagnetic manganese oxide

The electrical and magnetic response to a bias current has been investigated in a singlecrystalline ferromagnetic manganese oxide $\Pr_{0.8}$Ca$_{0.2}$MnO$_3$ . A significant decrease of the magnetization is observed at the same threshold current where a non-linearity of V-I characteristics appears. Such a behavior cannot be understood in the framework of the filamentary picture usually invoked for the non linearity of the other manganese oxides. Instead, an analogy with spintronic features might be useful and experimental signatures seem to be in agreement with excitations of spin waves by an electric current. This provides an example of a bulk system in which the spin polarized current induces a macroscopic change in the magnetization.Comment: 3 pages, 4 figure

On the Stability of the Equilibrium of Multivariant Systems

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Situation awareness and ability in coalitions

This paper proposes a discussion on the formal links between the Situation Calculus and the semantics of interpreted systems as far as they relate to Higher-Level Information Fusion tasks. Among these tasks Situation Analysis require to be able to reason about the decision processes of coalitions. Indeed in higher levels of information fusion, one not only need to know that a certain proposition is true (or that it has a certain numerical measure attached), but rather needs to model the circumstances under which this validity holds as well as agents' properties and constraints. In a previous paper the authors have proposed to use the Interpreted System semantics as a potential candidate for the unification of all levels of information fusion. In the present work we show how the proposed framework allow to bind reasoning about courses of action and Situation Awareness. We propose in this paper a (1) model of coalition, (2) a model of ability in the situation calculus language and (3) a model of situation awareness in the interpreted systems semantics. Combining the advantages of both Situation Calculus and the Interpreted Systems semantics, we show how the Situation Calculus can be framed into the Interpreted Systems semantics. We illustrate on the example of RAP compilation in a coalition context, how ability and situation awareness interact and what benefit is gained. Finally, we conclude this study with a discussion on possible future works

Conditions de stabilité des détonations multiphasiques et calcul de leur structure interne.

La stabilité des détonations monophasiques est connue depuis plus d'un siècle. En revanche, les conditions de stabilité des ondes de détonation multiphasiques et leur structure interne sont restées inconnues, par manque de modèle d'écoulement plausible et en raison de l'absence de relations de saut au choc. Sur la base d'un modèle d'écoulement à une seule vitesse et une seule pression (mais plusieurs températures), et de relations de saut appropriées, la détermination de cette structure est désormais possible. Dans ce rapport, on se propose de mettre en place une méthodologie d'analyse et de résolution, en rappelant les deux principaux modèles existant pour le calcul de la structure interne des ondes de détonation monophasiques. Dans le cas particulier où le fluide obéit à une loi des gaz parfaits, on explicite sa solution analytique, et l'on propose un algorithme numérique donnant une solution approchée. Cette méthode sert de base a l'élaboration de celui que l'on utilise pour un fluide multiphasique. Dans ce rapport, nous proposons une détermination de la structure interne des ondes de détonations multiphasiques. Des tests numériques sont effectués pour valider et évaluer à la fois le modèle et le solveur proposés

Sexual orientation and mental health: a review [Orientation sexuelle et santé mentale : une revue de la littérature ]

International audienceBACKGROUND: The aim of this paper is to review available knowledge on sexual orientation and mental health, especially for women. METHODS: Papers published in English or French, between 1997 and 2007, were selected in PubMed using the following keywords "homosexuality/sexual orientation and mental health/depression/suicide". To be retained, papers had to contain findings from quantitative surveys comparing homosexual and heterosexual adults. In all, this review analyses 22 papers including two that are based on the same survey. RESULTS: This review found a general pattern of poorer mental health for homosexuals and even more so for bisexuals compared to heterosexuals. Results are especially consistent regarding elevated risk of suicide attempts

Notion de capacité dans un contexte multi-agents : une modélisation dans le calcul des situations

Dans cet article, nous étudions la notion de capacité et en particulier sa relation à la notion d’actions, dans un contexte multi-agents. Après avoir proposé une définition informelle de la notion de capacité, nous en proposons une modélisation dans le calcul des situations

Liquid and liquid-gas flows at all speeds : Reference solutions and numerical schemes

This paper present some reference solutions to be used in order to validate and improve numerical schemes for multiphase flows. We address here exact one-dimensional liquid and liquid-gas compressible flows solutions in nozzles. The exact solution is first derived for the compressible single liquid phase Euler equations and extends the well known ideal gas dynamic nozzle flow solutions.The all Mach number scheme is then derived. A preconditioned Riemann solver is built and embedded into the Godunov explicit scheme. It is shown that this method converges to exact solutions but needs too small time steps to be efficient. An implicit version is then derived, in one dimension first and second in the frame of 3D unstructured meshes

Donne vittime di violenza da parte del partner: quali strade per chidere aiuto?

La ricerca di sostegno sociale ha un ruolo centrale nell’uscita dalla violenza; avere figli (nel testo verrà utilizzato il sostantivo “figli” per indicare l’insieme dei figli e delle figlie delle donne) e divenire consapevoli degli effetti che la violenza ha su di loro è spesso l’elemento chiave che spinge le donne a ricercare aiuto. Questo studio ha l’obiettivo di indagare quali fonti di aiuto le donne contattano prima di rivolgersi ad un Centro Antiviolenza (CAV) e di analizzare le circostanze in cui lo fanno. A tal fine è stato condotto uno studio trasversale in cinque CAV del Nord Italia. Centocinquantuno donne hanno compilato autonomamente un questionario anonimo. Le donne hanno riportato elevati livelli di tutte le tipologie di violenza; i figli erano, nella maggior parte dei casi, direttamente coinvolti nelle violenze. Il 33% delle donne ha riferito di aver contattato 4 o più fonti di aiuto prima di arrivare al CAV. Il coinvolgimento dei figli nelle violenze ha portato le donne a rivolgersi a più fonti di aiuto rispetto alle situazioni in cui i figli non erano coinvolti. I risultati sottolineano l’importanza di formare tutti i professionisti e le professioniste che potrebbero incontrare nel loro percorso professionale delle donne che hanno subito o che stanno subendo violenza. La demande d’aide et de soutien joue un rôle central pour mettre fin à la violence du partenaire et pour marquer le tournant dans le processus concernant la prise de conscience des effets de la violence sur les enfants. Cette étude vise à examiner les sources d’assistance que les femmes ont contactées avant d’arriver au centre anti-violence et à analyser les circonstances concrètes des cas de figure. Une étude transversale a été menée sur les femmes qui se sont adressées à un centre antiviolence en Italie. Cent cinquante et une femmes ont rempli un questionnaire auto-administré. Elles ont signalé des niveaux élevés de toutes les typologies de violence entre partenaires intimes ; les enfants étaient étroitement associés à la violence. Avant d’arriver au centre anti-violence, 33,1 % de l’échantillon a contacté au moins quatre sources d’assistance. Lorsque les enfants étaient impliqués dans la violence, les sources activées étaient plus nombreuses que si les enfants ne l’étaient pas. L’étude rappelle toute l’importance d’améliorer la capacité des professionnels à reconnaître la violence et à soutenir les victimes. Looking for help and support has a central role in the process of putting an end to partner violence and an important turning-point in the process of deciding to seek help is having children and becoming aware of the effects of the violence on them. This study aims to investigate which sources of help women contacted before arriving at an Anti-violence Centre(AVC), and to analyse the circumstances in which they contacted them. A cross-sectional study was conducted among women arriving at an Anti-violence Centre in Italy. One hundred and fifty-one women filled in a self-administered questionnaire. The women reported high levels of all typologies of IPV (Intimate Partner Violence); the children were closely involved in the violence. Before arriving to the AVC, 33.1% of the sample contacted four or more sources. When children were involved in violence, more sources were activated, than in cases in which children were not involved. This study points to the importance of improving practitioners’ ability to recognize violence and support the victims

TaMaris Project : Interpretation of detected suspect vessel events

International audienceAs we face varied unlawful activities and other threats, innovative solution shall be set up to permanently track and monitor all type of ship traffics, in vulnerable trading lanes and country border zones in order to detect abnormal vessel behaviour, to understand suspicious event and to early identify threatening situation. TaMaris on going development is a technical capability grouping analysis tools and operational procedures, operated from state of art human machine interface (HMI), to support experts group in understanding suspicious event, early identify threat and generating argued electronic report. Reports required for keeping continuously informed decisional authority ..