4,116 research outputs found
Diboson search and multivariate tools in the pp¯→ lν + heavy flavor channel at CDF
No full textThis paper describes the application of machine learning techniques to the diboson search in the lepton plus neutrino plus heavy flavor jets channel at CDF. Three different aspects of this challenging search are analyzed: multijet background rejection with the use of a support vector machine discriminant, light/heavy flavor jets separation with a 26 input variable neural network and b-jet
specific energy corrections, where a resolution improvement is obtained feeding a neural network with both calorimeter and tracking information
Muon Reconstruction and Performances with the ATLAS Detector
No full textThis poster, to be presented at the Beauty 2013 conference (8-12 April 2013, Bologna, IT) summarizes the functioning of the ATLAS sub-detectors used for the muon identification, the muon momentum reconstruction procedure, and the performances according to the latest measurements performed with the 2012 dataset
Searches for Low Mass Higgs Boson at the Tevatron
No full textWe present the result of the searches for a low mass Standard Model Higgs boson performed at the Tevatron pp¯ collider (√s = 1.96 TeV) by the CDF and D0 experiments with an integrated luminosity of up to 8.5 fb-1. Individual searches are discussed and classified according to their sensitivity. Primary channels rely on the associate production with a vector boson (WH or ZH) and the H → bb¯ decay channel (favored for MH ≲ 135 GeV/c2). Event selection is based on the leptonic decay of the vector boson and the identification of b–hadron enriched jets. Each individual channel is sensitive, for MH = 115 GeV/c2, to less than 5 times the SM expected cross section and the most sensitive channels can exclude a production cross section of 2.3×σHSM Secondary channels rely on a variety of final states. Although they are from 2 to 5 times less sensitive than any primary channel, they contribute to the Tevatron combination and, in some cases, they pose strong constrains on exotic Higgs boson models
Response to letter to the editor regarding ‘Could Surgical Experience of Adult Endourologist Overcome the Learning Curve of Retrograde Intrarenal Surgery in Children?’
No full textPublic Space Policies from Francesco to Ludovico Maria Sforza
No full textThis article explores whether Sforza’s Milan exemplifies significantly relationships between forms of power and the styles of configuration and use of public space in evidence in other Italian regions. In particular, it asks whether the projects devised and realised (often ephemeral ones) were one-off affairs or part of a wider strategy or plan. While there have been numerous studies on the age of Ludovico Maria Sforza, we believe that an analysis of the relationship between all the Sforza princes, their city, and its civic institutions can yield further insights. We examine the dukes’ influence in three different urban spaces in Milan, the capital city of the duchy, that sit in front of public buildings: the Piazza del Duomo (formerly the Piazza dell’Arengo), the Piazza del Broletto, and the Piazza del Castello
Numerical approximations for energy preserving microfacet models
No full textMicrofacet models suffer from a significant limitation: they are not energy preserving, resulting in an unexpected darkening of rough specular surfaces. Energy compensation methods face this limitation by adding to the BSDF a secondary component accounting for multiple scattering contributions. While these methods are fast, robust and can be added to a renderer with relatively minor modifications, they involve the computation of the directional albedo. This quantity is expressed as an integral that does not have a closed-form solution, but it needs to be precomputed and stored in tables. These look-up tables are notoriously cumbersome to use, in particular on GPUs. This work obviates the need of look-up tables by fitting an analytic approximation of the directional albedo, which is a more practical solution. We enforce energy preservation by rescaling the specular albedo, thus maintaining the same lobe shape. We propose a 2D rational polynomial of degree three to fit conductors and a 3D rational polynomial of degree three to fit dielectrics and materials composed of a specular layer on top of a diffuse one, such as plastics. As an alternative, multi-layer perceptrons can be used, ensuring a more accurate approximation for dielectrics at the expense of a larger number of parameters to store. We validated our results via the furnace test, highlighting that materials rendered using our analytic approximations almost exactly match the behavior of the ones rendered with the use of look-up tables, resulting in an energy-preserving model even at maximum roughness. The software we use to fit coefficients is open-source and can be used to fit other BSDF models as well
Support vector machine classification on a biased training set: Multi-jet background rejection at hadron colliders
No full textThis paper describes an innovative way to optimize a multivariate classifier, a Support Vector Machine algorithm, on a problem characterized by a biased training sample. This is possible thanks to the feedback of a signal-background template fit performed on a validation sample and included both in the optimization process and in the input variable selection. The procedure is applied to a real case of interest at hadron collider experiments: the reduction and the estimate of the multi-jet background in the W→eν plus jets data sample collected by the CDF experiment. The training samples, partially derived from data and partially from simulation, are described in detail together with the input variables exploited for the classification. At present, the reached performance is better than any other prescription applied to the same final state at hadron collider experiments. © 2013 Elsevier B.V
Le lettere della sposa bambina: diplomazia e vita di corte nel carteggio di Caterina Sforza durante la minore età
No full textAbstract
Il matrimonio tra Caterina Sforza, figlia di Galeazzo Maria Sforza, e Girolamo Riario, nipote di papa Sisto IV, è deciso nel 1473, quando la sposa ha solo dieci anni. L’unione si compirà solo nel 1477, quando la quattordicenne Caterina attraverserà l’Italia per raggiungere a Roma il suo sposo. Sono numerose le lettere, conservatasi in vari archivi, che compongono il carteggio della Sforza-Riario con i parenti milanesi e altri notabili dei domini italiani durante la sua minore età. Il matrimonio nasce per sancire un patto diplomatico e nonostante la minore età di Caterina le sue lettere veicolano numerose informazioni, sempre utile merce di scambio nel gioco diplomatico che lega le potenze italiane, ed emozioni.
L’intervento si propone di evidenziare nel carteggio di e su Caterina Sforza il ruolo attivo di una donna e di una principessa nel gioco politico italiano nella seconda metà del Quattrocento facendo ricorso a fonti edite e inedite.
Résumé en français
Le mariage entre Caterina, fille de Galeazzo Maria Sforza, et Girolamo Riario, neveu du pape Sixte IV, fut décidé en 1473, alors que la mariée n’avait que dix ans. Ils ne se marieront qu’en 1477, lorsque Caterina, quatorze ans, traversera l’Italie pour rejoindre son mari à Rome. Il existe de nombreuses lettres qui composent la correspondance de la Sforza-Riario avec les parents et autres notables pendant son âge mineur. Malgré l’âge de Catherine, ses lettres rapportent beaucoup d’informations, décrivent des pratiques diplomatiques et communiquent des émotions. Ces lettres, qui constituent pour la plupart une correspondance entre femmes, donnent un aperçu de la dynamique politique et du mécénat qui gravitent autour de la famille du pape et des intérêts romains des ducs de Milan et au-delà.
L’intervention vise à mettre en évidence dans la correspondance de et sur Caterina Sforza le rôle actif d’une femme dans le jeu politique italien de la seconde moitié du XVe siècle en utilisant des sources publiées et inédites
Sforza Pallavicino and Zadar
No full textNa temelju arhivskih izvora prikazuju se procjene i obrambene mjere koje je kondotijer Sforza Pallavicino provodio u Zadru. U mletačkoj službi od 1557. godine, obišao je Dalmaciju 1559. i napisao izvješće o tamošnjim gradovima odnosno utvrdama. Iz tog i kasnijih njegovih tekstova vidljivo je kako je mnoge među njima smatrao slabima, a tri je utvrde – uz potrebna poboljšanja – ocijenio zadovoljavajućima: Zadar, Sv. Nikolu u Šibeniku i Trogir. Sforza je visoko cijenio Zadar kao najvažnije mletačko uporište između Venecije i Krfa, s lukom pogodnom i za veliku flotu. Namjera mu je bila zaštititi i luku širokim novim fortifikacijskim pojasom, što je ostalo neostvareno. Od 1567. godine prema vlastitom projektu vodio je izgradnju velike predutvrde na kopnenoj strani, nazvane Forte. Iz njegovih zapisa doznaje se da je bio projektantom i dvaju bastiona osnovnog obrambenog pojasa, Sv. Marcele i Citadele, kojima je dao primarnu zadaću da nadziru dvije bočne stranice Fortea, kojega je pak koncipirao kao glavnu točku obrane Zadra. U radu je prikazana i njegova polemika s Ferranteom Vitellijem, koji je svoj osvrt na zadarske utvrde sastavio 1576., a Sforza mu je odgovorio 1578. godine.Based on the archival sources, the author presents the assessments and defensive measures implemented by condottiere Sforza Pallavicino in Zadar. In the Venetian service from 1557, he visited Dalmatia in 1559 and wrote a report on the towns and forts there. It is evident from that and his later texts that he considered many of them to be weak, and he rated only three fortifications as satisfactory, suggesting the necessary improvements: Zadar, St Nicholas in Šibenik, and Trogir. Sforza highly valued Zadar as the most important Venetian stronghold between Venice and Corfu, with a port that was suitable for a large fleet. His intention was to protect the harbour with a wide new fortification belt, which remained unaccomplished. From 1567, according to his own project, he led the construction of a large landside outwork, called Forte. It is known from his records that he also designed two bastions included in the main defence belt: St Marcella and the Citadel bastion, to which he assigned the primary task of controlling the two flanks of Forte, which he conceived as the main point of Zadar’s defence. The paper also shows Sforza’s polemic with Ferrante Vitelli, who wrote his review of the Zadar fortifications in 1576 and Sforza replied to him in 1578
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