940 research outputs found
Results from the 2003 beam test of a MDT BIL chamber : systematic uncertainties on the TDC spectrum parameters and on the space-time relation
No full textThe latest version of MDT front-end electronics, which provides information about the collected charge through a Wilkinson ADC, has been used at the Roma Tre BIL cosmic test site. An analysis of the data collected with this electronics is presented. A method to improve the spatial resolution of MDT chambers using the ADC information to correct the time response has been developed. The procedure is based solely on the data from the MDT chamber itself. The results are compared with a simulation of the tube response with the Garfield program
Apparato per la valutazione della rigidità dinamica con il metodo dell'impatto
No full textLa conoscenza della rigidità dinamica dei materiali utilizzati come elemento di disaccoppiamento nei pavimenti galleggianti permette la valutazione dell’incremento per l’isolamento al rumore di calpestio ottenibile. Questo lavoro propone i principi progettuali di un apparato a basso costo che permetta la determinazione dei principali parametri caratterizzanti i materiali resilienti comunemente utilizzati in edilizia; tale macchina potrà essere impiegata sia in laboratorio, per catalogare materiali diversi, che in ambito industriale per il controllo delle caratteristiche dei prodotti. Il sistema si basa sulla sollecitazione dinamica di un provino mediante una forzante impulsiva. Mediante misure accelerometriche, si ricavano quindi i principali parametri di interesse (fattore di smorzamento, frequenza di risonanza della vibrazione verticale fondamentale, la rigidità dinamica). Per la progettazione dell’apparato sono state seguite le indicazioni delle norme UNI EN 29052-1, UNI EN 29053, ISO 7626-1, ISO 7626-2 e ISO 7626-5
A Preliminary Study of Z+b Production at LHC
No full textThe study of Z boson production in association with a single heavy flavor jet (gQ ¡æZQ(Q = b,c)) can provide for the Higgs boson, when it is produced together with a b quark and decays in the same final states (b.b, ¥ó+ ¥ó., ¥ì+ ¥ì.). The expected statistics and purity of the event sample that could be selected in the data are evaluated considering two different This paper presents a preliminary investigation of the potential to study the channel Z+b. jet with the Z ¡æ ¥ì¥ìat LHC. methods for the b tagging. The analysis has been performed, first, with a fast simulation of the ATLAS detector, and then, using the full simulation and the complete offline reconstruction algorithms in the official ATLAS software framework
Perioperative glial fibrillary acidic protein is associated with long-term neurodevelopment outcome of infants with congenital heart disease
No full textBackground: Brain injury, impaired brain maturation, and long-term neurodevelopmental disorders are common in infants with congenital heart diseases (CHD).We aimed to assess whether plasma glial fibrillary acidic protein (GFAP) can predict neurodevelopmental anomalies in CHD infants operated on cardiopulmonary bypass (CPB). Methods: We measured plasma GFAP in 38 infants at multiple CPB phases. Cognitive, neuropsychological, and psychopathological functioning were assessed 5.7 ± 2.2 years after surgery. We identified an impaired global neurodevelopmental index (NDI) when at least two domains were abnormal. The relationships between NDI, GFAP, and clinical variables were explored with non-supervised feature selection methods and modeled with a nested non-linear logistic regression. Results: Intelligence quotient scores were within the normal range in 84% of children, whereas 58% showed an abnormal NDI, with the greatest impairments in the psychopathological area. The plasma GFAP peak was 0.95 (0.44–1.57) ng/mL, and it was correlated with age, weight, duration of surgery phases, and CPB minimum temperature. In the regression model, the GFAP peak was associated with an impaired NDI with a possible flexible point toward NDI impairment at 0.49 ng/mL, keeping constant ICU stay, CPB duration, CHD anatomy, weight, and CPB minimum temperature. Conclusion: GFAP is a promising early marker of abnormal long-term neuropsychological development
METABOLOMIC PROFILING INDICATES AN ALTERATION IN URINE KYNURENINE PATHWAY METABOLITES IN INFANTS WITH TRASNSPOSITION OF GREAT ARTERIES UNDERGOING SURGICAL REPAIR
No full textRole of cardiopulmonary bypass in the acute lung injury of children with congenital heart diseases
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