7,542 research outputs found

    The DELPHI Silicon Tracker in the global pattern recognition

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    ALEPH and DELPHI were the first experiments operating a silicon vertex detector at LEP. During the past 10 years of data taking the DELPHI Silicon Tracker was upgraded three times to follow the different tracking requirements for LEP 1 and LEP 2 as well as to improve the tracking performance. Several steps in the development of the pattern recognition software were done in order to understand and fully exploit the silicon tracker information. This article gives an overview of the final algorithms and concepts of the track reconstruction using the Silicon Tracker in DELPHI.Comment: Talk given at the 8th International Workshop on Vertex Detectors, Vertex'99, Texel, Nederland

    Investigation of the Flexural Fatigue Behavior of Stone-Faced Cork Agglomerate Sandwich Composite

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    Creazione di appositi test e studio del comportamento a fatica flessionale di composito sandwich asimmetrico formato da strati di: pietra, fibre di vetro e sughero. Sono stati descritti e discussi modi di rottura del materiale composito con due configurazioni, che variano per il tipo di pietra usata.ope

    Development of Detectors for Physics at the Terascale

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    The detector systems for particle physics experiment at the future high-energy and high-luminosity colliders will need to improve resolution, radiation hardness, and rate capability with respect to the current generation of experiments. Many promising technological solutions are being developed for both tracking detectors and calorimeters

    Test Beam Results of Geometry Optimized Hybrid Pixel Detectors

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    The Multi-Chip-Module-Deposited (MCM-D) technique has been used to build hybrid pixel detector assemblies. This paper summarises the results of an analysis of data obtained in a test beam campaign at CERN. Here, single chip hybrids made of ATLAS pixel prototype read-out electronics and special sensor tiles were used. They were prepared by the Fraunhofer Institut fuer Zuverlaessigkeit und Mikrointegration, IZM, Berlin, Germany. The sensors feature an optimized sensor geometry called equal sized bricked. This design enhances the spatial resolution for double hits in the long direction of the sensor cells.Comment: Contribution to Proceedings of Pixel2005 Workshop, Bonn Germany 200

    Survey of the ATLAS Pixel Detector Components

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    This document provides a description of the survey performed on different components of the ATLAS Pixel Detector at different stages of its assembly

    Evidence of a bacterial carbonate coating on plaster samples subjected to the Calcite Bioconcept biomineralization technique

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    International audienceDegradation of historical buildings is mainly due to the intrusion of water which is the main vector of pollutants. Different types of surface treatment have been proposed to avoid or limit this effect. One alternative to chemical treatments is the use of the carbonatogenesis property of some bacteria. This bacterial production has been evidenced on concrete and on limestone samples in an aqueous environment. However, the carbonate production was measured indirectly and the experimental protocol was far from real conditions of use. In this paper, with the same protocol as an industrial one, and using a surface selective investigation method, grazing incidence X-ray diffraction, we show the structural and morphological evolution of the carbonate coating produced on model plaster samples. This substrate was chosen in order to unambiguously detect the bacterial carbonate production

    Development of enteric coated sustained release minitablets containing mesalamine

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    O presente trabalho teve como objetivo desenvolver e avaliar um sistema multiparticulado de libera√ß√£o modificada, composto por minicomprimidos com sistema matricial de libera√ß√£o prolongada revestidos com pol√≠mero de libera√ß√£o pH-dependente, utilizando mesalazina como f√°rmaco modelo. Polyox¬ģ WSR 1105 foi o pol√≠mero utilizado no sistema matricial e Eudragit¬ģ L30D55 foi utilizado como pol√≠mero pH-dependente. Os minicomprimidos (com 20%, 30% e 40% de concentra√ß√£o de Polyox¬ģ) foram preparados por granula√ß√£o via seca, gerando minicomprimidos de boa qualidade. Os minicomprimidos desenvolvidos foram revestidos em leito fluidizado a 8% de n√≠vel de revestimento. Efetuou-se o estudo de dissolu√ß√£o em meios que simulam o trato gastrointestinal (pH 1,4, 6,0 e 7,2) e as formula√ß√£o contendo maiores concentra√ß√Ķes de Polyox¬ģ foram capazes de reter a libera√ß√£o do f√°rmaco em pH 1,4. Todas as tr√™s formula√ß√Ķes apresentaram libera√ß√£o prolongada e comportamento cin√©tico de ordem zero. O modelo de libera√ß√£o de Korsmeyer-Peppas mostrou que as formula√ß√Ķes com 20% e 30% de pol√≠mero apresentam comportamento de transporte an√īmalo, enquanto a com 40%, transporte super caso II. A efici√™ncia de dissolu√ß√£o mostrou que somente as formula√ß√Ķes com 20% e 40% de concentra√ß√£o do pol√≠mero foram consideradas estatisticamente diferentes.The aim of this study was to develop and evaluate a multiparticulate modified release system, composed of minitablets with a sustained release matrix system coated with a pH-dependent release polymer, using mesalamine as a model drug. Polyox¬ģ WSR 1105 was the polymer used in the matrix system and Eudragit¬ģ L30D55 was used as a pH-dependent polymer. The minitablets (with 20%, 30% or 40% Polyox¬ģ concentration) were prepared by dry granulation, which led to good quality minitablets. The developed minitablets were coated in a fluidized bed at 8% of the coating level. Dissolution studies were performed in media that simulated the gastrointestinal tract (pH 1.4, 6.0 and 7.2) and showed that formulations with higher Polyox¬ģ concentrations were capable of retaining the drug release in pH 1.4. All formulations prolonged the drug release and presented zero-order kinetic behaviour. The Korsmeyer-Peppas model demonstrated that formulations with 20% or 30% of polymer exhibited anomalous transport behaviour, whilst the 40% sample exhibited super case II model transportation. Dissolution efficiency showed that only the formulations containing 20% and 40% polymer could be considered statistically different

    Drosophila suzukii (Matsumura) (Diptera: Drosophilidae) in Peaches: is it a problem?

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    Healthy peach fruit is not considered a preferred host for Drosophila suzukii (Matsumura); however, it becomes a more preferable host when damaged. Thus, damaged peach fruit is of importance not only in terms of economic losses, but also because it serves as a reservoir for this fly species. This work aimed to evaluate the suitability of peaches mechanically damaged or harboring the brown rot disease as hosts for D. suzukii compared to hosts for which they have a low (undamaged peach) and high (undamaged strawberry) preference. Damaged peaches were as susceptible as undamaged strawberries. Fungus infection alone did not increase the susceptibility of peaches compared to undamaged peaches. This information should be considered when an Integrated Pest Management program is defined in a scenario of different species of fruit production

    Determinants of excessive weight gain during pregnancy in a public low risk antenatal care service

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    INTRODUCTION: Excessive weight gain during pregnancy tends to result in postpartum weight retention and contributes to obesity in women. METHODS: This study evaluated the influence of socio-economic factors, obstetric history, smoking, having a job, and initial nutritional status on excessive weight gain (EWG). EWG was estimated according to IOM recommendations (weekly gain > 0.58g, >0.53g and >0.39g which correspond to an initial nutritional status of underweight, eutrophic, overweight/obesity, respectively). We studied a cohort of 141 healthy pregnant women enrolled in public health services, between March 1997 and March 1998. The influence of each study variable on EWG was checked separately for the 2nd and 3rd trimesters using the Poisson model for hierarchy multiple regression analysis. RESULTS: Amongst the 237 eligible pregnant women, there were 37.8% of patient losses, but no statistical significance was detected for the main study variables. The incidence of EWG during the 2nd trimester was 38.6% (CI95% 30.5 - 47.2) and during 3rd trimester it was 36.4% (CI95% 28.5 - 45.0). During the 2nd trimester only schooling was associated with EWG. When comparing women who studied less than 5 years, with the ones who studied 5 to 8 years and those with more than 8 years of schooling, relative risks were 2.09 (CI95% 1.03 - 4.25) and 2.62 (CI95% 1.32 - 5.22), respectively. In the 3rd trimester the variables that resulted in statistical significance were: less than 8 years of schooling (RR= 1.91 [CI95% 1.22 - 2.97], living without a partner (RR=1.66 [(CI95% 1.06 - 2.59], primiparas (RR= 2.13 [CI95% 1.20 - 3.85]; adequate initial nutritional status and overweight/obesity (RR= 1.53 [CI95% 0.82 - 2.84] and RR=2.02 [IC95% 1.04 - 3.92], respectively) in comparison to those who were underweight. CONCLUSION: Based on the high incidence of EWG, more attention should be given during antenatal care, particularly in women with more schooling, those living without partner, primiparas and those who have an initial adequate nutritional status or overweight/obesity during pregnancy, in order to prevent and control the problem.INTRODU√á√ÉO: O excesso de ganho de peso durante a gesta√ß√£o pode ocasionar reten√ß√£o de peso p√≥s-parto e contribuir para a obesidade no sexo feminino. METODOLOGIA: Neste estudo, avaliou-se a influ√™ncia de fatores sociodemogr√°ficos, hist√≥ria gestacional, tabagismo, trabalho fora de casa e estado nutricional inicial sobre o ganho ponderal excessivo (GPE). O GPE foi estimado a partir das. recomenda√ß√Ķes do IOM (ganho semanal >0,58g, >0,53g e >0,39g, correspondentes a estado de nutricional no in√≠cio da gesta√ß√£o: desnutrida, adequada e sobrepeso/obesidade, respectivamente). Estudou-se uma coorte de 141 gestantes saud√°veis, inscritas em servi√ßo p√ļblico de pr√©-natal, entre mar√ßo de 1997 e mar√ßo de 1998. A influ√™ncia dos fatores de estudo sobre o GPE foi testada separadamente no 2¬ļ e 3¬ļ trimestres mediante an√°lise de regress√£o de Poisson m√ļltipla hierarquizada. RESULTADOS: Dentre as 237 eleg√≠veis houve 37,8% de perdas, n√£o se detectando diferen√ßas estatisticamente significativas para as vari√°veis centrais do estudo. A incid√™ncia de GPE no 2¬ļ trimestre foi de 38,6% (IC95% 30,5 - 47,2) e no 3¬ļ trimestre foi de 36,4% (IC95% 28,5 - 45,0). No 2¬ļ trimestre, apenas a escolaridade mostrou-se associada ao GPE. Em rela√ß√£o √†s mulheres com menos de 5 anos de escolaridade, as gestantes com 5 a 8 anos e acima de 8 anos de escolaridade apresentaram riscos relativos correspondentes a 2,09 (IC95% 1,03 - 4,25) e 2,62 (IC95% 1,32 - 5,22), respectivamente. No 3¬ļ trimestre mostraram signific√Ęncia estat√≠stica as vari√°veis: escolaridade >8 anos (RR=1,91 [IC95% 1,22 - 2,97], aus√™ncia de companheiro (RR=1,66 [(IC95% 1,06 - 2,59], primiparidade (RR=2,13 [IC95% 1,20 - 3,85] e estado nutricional inicial adequado e sobrepeso/obesidade (RR=1,53 [IC95% 0,82 _ 2,84] e RR=2,02 [IC95% 1,04 - 3,92], respectivamente) em rela√ß√£o √†s desnutridas. CONCLUS√ÉO: Em fun√ß√£o da elevada freq√ľ√™ncia de GPE, particularmente em mulheres de escolaridade mais alta, as sem companheiro, as prim√≠paras e aquelas com estado nutricional inicial adequado ou sobrepeso/obesidade durante a gesta√ß√£o, mais aten√ß√£o deveria ser dada √† preven√ß√£o e ao controle do problema durante o pr√©-natal.Universidade de S√£o Paulo Faculdade de Sa√ļde P√ļblica Depto de Nutri√ß√£oUniversidade Federal de S√£o Paulo (UNIFESP)UNIFESPSciEL
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