210 research outputs found

    Equivalence-Invariant Algebraic Provenance for Hyperplane Update Queries

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    The algebraic approach for provenance tracking, originating in the semiring model of Green et. al, has proven useful as an abstract way of handling metadata. Commutative Semirings were shown to be the "correct" algebraic structure for Union of Conjunctive Queries, in the sense that its use allows provenance to be invariant under certain expected query equivalence axioms. In this paper we present the first (to our knowledge) algebraic provenance model, for a fragment of update queries, that is invariant under set equivalence. The fragment that we focus on is that of hyperplane queries, previously studied in multiple lines of work. Our algebraic provenance structure and corresponding provenance-aware semantics are based on the sound and complete axiomatization of Karabeg and Vianu. We demonstrate that our construction can guide the design of concrete provenance model instances for different applications. We further study the efficient generation and storage of provenance for hyperplane update queries. We show that a naive algorithm can lead to an exponentially large provenance expression, but remedy this by presenting a normal form which we show may be efficiently computed alongside query evaluation. We experimentally study the performance of our solution and demonstrate its scalability and usefulness, and in particular the effectiveness of our normal form representation

    Tuberculose sous cutanée cervico-thoracique: à propos d’un cas

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    La tuberculose de la paroi thoracique est une affection très rare. Nous rapportons le cas d'une tuberculose cervico-thoracique qui s'est présentée dans un tableau de cellulite chez un jeune patient immunocompétent de 26 ans sans antécédent de tuberculose. La TDM thoracique a mis en évidence une collection sous cutanée de la paroi antérieure du thorax, sans atteinte osseuse ni pleuro-pulmonaire associées. L'incision drainage a permis l'évacuation de la collection et le prélèvement histologique. L'étude anatomopathologique est revenue en faveur d'une tuberculose et un traitement anti-bacillaire de 9 mois a été débuté. L'évolution a été marquée par une perte de substance cutanée étendue en regard de l'ancienne collection ayant nécessité une greffe de peau libre. Ce diagnostic doit toujours rester présent à l'esprit surtout dans les pays d'endémie de tuberculose

    MĂ©lanome endobronchique

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    Le mélanome malin a un potentiel métastatique important. Les métastases pulmonaires du mélanome sont communes cependant la localisation endobronchique reste rare et pose le problème de son origine primitive ou secondaire. Nous rapportons le cas d’un mélanome pulmonaire qui présente des particularités intéressantes: une lésion cutanée présumée primitive totalement régressive, la présentation radio clinique mimant parfaitement un cancer bronchique primitif, un aspect endoscopique bourgeonnant et grisâtre dont l’étude histologique a permis de poser le diagnostic, une agressivité tumorale avec une extension intracardiaque et bourgeon tumoral intra cavitaire. A travers cette observation, les auteurs étudient les caractéristiques radio-cliniques pouvant distinguer le mélanome pulmonaire primitif du secondaire; la localisation endobronchique avec une revue de la littérature sur les métastases endo bronchiques; le bilan d’extension à entamer en cas de mélanome pulmonaire ainsi que les difficultés thérapeutiques posés par ce type de lésion dont le pronostic reste péjoratif

    Local adaptations of Mediterranean sheep and goats through an integrative approach

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    Small ruminants are suited to a wide variety of habitats and thus represent promising study models for identifying genes underlying adaptations. Here, we considered local Mediterranean breeds of goats (n = 17) and sheep (n = 25) from Italy, France and Spain. Based on historical archives, we selected the breeds potentially most linked to a territory and defined their original cradle (i.e., the geographical area in which the breed has emerged), including transhumant pastoral areas. We then used the programs PCAdapt and LFMM to identify signatures of artificial and environmental selection. Considering cradles instead of current GPS coordinates resulted in a greater number of signatures identified by the LFMM analysis. The results, combined with a systematic literature review, revealed a set of genes with potentially key adaptive roles in relation to the gradient of aridity and altitude. Some of these genes have been previously implicated in lipid metabolism (SUCLG2, BMP2), hypoxia stress/lung function (BMPR2), seasonal patterns (SOX2, DPH6) or neuronal function (TRPC4, TRPC6). Selection signatures involving the PCDH9 and KLH1 genes, as well as NBEA/NBEAL1, were identified in both species and thus could play an important adaptive role

    Crossing the Dripline to 11N Using Elastic Resonance Scattering

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    The level structure of the unbound nucleus 11N has been studied by 10C+p elastic resonance scattering in inverse geometry with the LISE3 spectrometer at GANIL, using a 10C beam with an energy of 9.0 MeV/u. An additional measurement was done at the A1200 spectrometer at MSU. The excitation function above the 10C+p threshold has been determined up to 5 MeV. A potential-model analysis revealed three resonance states at energies 1.27 (+0.18-0.05) MeV (Gamma=1.44 +-0.2 MeV), 2.01(+0.15-0.05) MeV, (Gamma=0.84 +-$0.2 MeV) and 3.75(+-0.05) MeV, (Gamma=0.60 +-0.05 MeV) with the spin-parity assignments I(pi) =1/2+, 1/2- and 5/2+, respectively. Hence, 11N is shown to have a ground state parity inversion completely analogous to its mirror partner, 11Be. A narrow resonance in the excitation function at 4.33 (+-0.05) MeV was also observed and assigned spin-parity 3/2-.Comment: 14 pages, 9 figures, twocolumn Accepted for publication in PR

    Plugged hexagonal templated silica: a unique micro-and mesoporous composite material with internal silica nanocapsules †

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    We describe in this paper the development of plugged hexagonal templated silicas (PHTS) which are hexagonally ordered materials, with internal microporous silica nanocapsules; they have a combined micro-and mesoporosity and a tuneable amount of both open and encapsulated mesopores and are much more stable than other tested micellar templated structures. Researchers of Mobil published in 1992 a breakthrough report on the synthesis of ordered mesoporous silica materials. All synthesised materials exhibit the typical X-Ray diffraction patterns of the 2D hexagonal pore ordering in the p6mm space group. 2 † The 77 K nitrogen isotherm in High resolution TEM measurements confirm this model. § The rather thick walls (~4 nm) of the large cylindrical mesopores are perforated with micropores. Moreover, the cylindrical mesopores themselves are 'plugged' with amorphous silica nanocapsules, which are also microporous. These nanocapsules are created by the large excess of the silica source (TEOS) that is used in the synthesis and by rapid hydrolysis of the silicon alkoxide at the very low pH used. The micropores in the silica walls can be explained by the penetration of hydrophilic poly(ethyleneoxide) chains of the triblock copolymer in the silica wall, as already suggested by Kruk et al. 7 The microporosity of the plugs may have a different origin. It is known that Pluronic triblock copolymers are in fact polydisperse mixtures of several triblock copolymers with a wide range of molecular weights, and that they contain appreciable amounts of diblock copolymers and even free PO chains. Some † Electronic supplementary information (ESI) available

    Plugged hexagonal templated silica: a unique micro-and mesoporous composite material with internal silica nanocapsules †

    Get PDF
    We describe in this paper the development of plugged hexagonal templated silicas (PHTS) which are hexagonally ordered materials, with internal microporous silica nanocapsules; they have a combined micro-and mesoporosity and a tuneable amount of both open and encapsulated mesopores and are much more stable than other tested micellar templated structures. Researchers of Mobil published in 1992 a breakthrough report on the synthesis of ordered mesoporous silica materials. All synthesised materials exhibit the typical X-Ray diffraction patterns of the 2D hexagonal pore ordering in the p6mm space group. 2 † The 77 K nitrogen isotherm in High resolution TEM measurements confirm this model. § The rather thick walls (~4 nm) of the large cylindrical mesopores are perforated with micropores. Moreover, the cylindrical mesopores themselves are 'plugged' with amorphous silica nanocapsules, which are also microporous. These nanocapsules are created by the large excess of the silica source (TEOS) that is used in the synthesis and by rapid hydrolysis of the silicon alkoxide at the very low pH used. The micropores in the silica walls can be explained by the penetration of hydrophilic poly(ethyleneoxide) chains of the triblock copolymer in the silica wall, as already suggested by Kruk et al. 7 The microporosity of the plugs may have a different origin. It is known that Pluronic triblock copolymers are in fact polydisperse mixtures of several triblock copolymers with a wide range of molecular weights, and that they contain appreciable amounts of diblock copolymers and even free PO chains. Some † Electronic supplementary information (ESI) available
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