A Simplified Efficient and Direct Unequal Probability Resampling = Un semplice Ricampionamento, efficiente e diretto per campioni a probabilita variabili

In questo lavoro si introduce una tecnica di ricampionamento valida per disegni campionari con differenti probabilita di inclusione. L\u2019idea di base ` e di usare ` un disegno di ricampionamento di tipo ppswor. Le principalei proprieta del metodo ` sono studiate, e le relazioni con altre metodologie di ricampionamento sono discusse.In this paper, a new resampling technique for sampling designs with unequal inclusion probabilities is proposed. The basic idea is to use a resampling design based on ppswor. Its main properties are studied, and its relationships with other resampling methodologies are discussed

Parthenocissus tricuspidata: un modèle végétal d’adhésion biologique

The Parthenocissus Tricuspidata, genus of the Vitaceae family, is a rustic plant with lianas, whose tendrils tips have organelles called adhesive discs that, set near a substrate, adhere to it.Studies of A.G. ENDRESS, W. THOMSON, S. JUNKER attribue the disc adhesion ability to an adhesive substance secretion instead of a suction mechanism.Teeth were set beneath the tendrils and in few weeks the adhesion to enamel, dentin and radicular cement was so strong as the usual adhesion to the wall, except with teeth that were set before in fluoride gel, because of the element cytotoxicity.Then the adhesion place was investigated with microanalysis and S.E.M.The microanalysis has shown calcium and phosphorus both on enamel and on adhesion place, while silicon, sulphur, chlorine and potassium were only on the adherent vegetable substance.The S.E.M. analysis was conducted on the enamel surface, after removing of the vegetable, and perpendicularly to the adhesion surface of the vegetable with the enamel, the dentin and the cementum.La Parthenocissus Tricuspidata, genre appartenant à la famille des Ampélidiacées, est une plante rustique, grimpante, pourvue de vrilles à l’extrémité desquelles se différencient des organes appelés disques adhé ifs qui, au voisinage d’un substrat, adhèrent à celui-ci de façon tenace.Des études de A.G. ENDRESS, W. THOMSON, S. JUNKER n’attribuent pas tellement à ce disque la capacité d’adhérer au substrat avec un mécanisme à ventouse mais plutôt grâce à la sécrétion d’une substance adhésive.Les éléments dentaires ont été solidement fixés au-dessous des vrilles et au bout de quelques semaines l’adhésion sur l’émail, sur la dentine et sur le cément radiculaire se révèlait aussi tenace que l’adhésion qui se produit habituellement pour le cément, à l’exception des éléments immergés auparavant dans un gel fluoré, peut-être à cause de la cytotoxicité de l’élément lui-même.Le siège de l’adhésion à l’émail a été ensuite soumis à deux types d’examens: la microanalyse et la microscopie électronique à balayage.La microanalyse a révélé la présence de calcium et de phosphore aussi bien sur l’émail que sur la zone d’adhésion, alors que le silicium, le soufre, le chlore et le potassium ne se rencontrent que sur la substance végétale adhérée.L’étude au M.E.B. a été effectuée soit sur la surface de l’émail, après séparation du végétal, soit sur la coupe orthogonale à la surface d’adhésion du végétal à l’émail, à la dentine et au cément radiculaire

Stability and collisions of moving semi-gap solitons in Bragg cross-gratings

We report results of a systematic study of one-dimensional four-wave moving solitons in a recently proposed model of the Bragg cross-grating in planar optical waveguides with the Kerr nonlinearity; the same model applies to a fiber Bragg grating (BG) carrying two polarizations of light. We concentrate on the case when the system's spectrum contains no true bandgap, but only semi-gaps (which are gaps only with respect to one branch of the dispersion relation), that nevertheless support soliton families. Solely zero-velocity solitons were previously studied in this system, while current experiments cannot generate solitons with the velocity smaller than half the maximum group velocity. We find the semi-gaps for the moving solitons in an analytical form, and demonstrated that they are completely filled with (numerically found) solitons. Stability of the moving solitons is identified in direct simulations. The stability region strongly depends on the frustration parameter, which controls the difference of the present system from the usual model for the single BG. A completely new situation is possible, when the velocity interval for stable solitons is limited not only from above, but also from below. Collisions between stable solitons may be both elastic and strongly inelastic. Close to their instability border, the solitons collide elastically only if their velocities c1 and c2 are small; however, collisions between more robust solitons are elastic in a strip around c1=-c2.Comment: 16 pages, 7 figures, Physics Letters A, in pres

95 Efficacy, damage accrual and predictors of response to belimumab in active sle patients: a large italian multicenter prospective study

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New Imaging Technologies To Characterize Arrhythmic Substrate

The cornerstone of the new imaging technologies to treat complex arrhythmias is the electroanatomic (EAM) mapping. It is based on tissue characterization and in particular on determination of low potential region and dense scar definition. Recently, the identification of fractionated isolated late potentials increased the specificity of the information derived from EAM. In addition, non-invasive tools and their integration with EAM, such as cardiac magnetic resonance imaging and computed tomography scanning, have been shown to be helpful to characterize the arrhythmic substrate and to guide the mapping and the ablation. Finally, intracardiac echocardiography, known to be useful for several practical uses in the setting of electrophysiological procedures, it has been also demonstrated to provide important informations about the anatomical substrate and may have potential to identify areas of scarred myocardium

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

Measurement of the cross section of high transverse momentum Z→bb̄ production in proton–proton collisions at √s = 8 TeV with the ATLAS detector

This Letter reports the observation of a high transverse momentum Z→bb̄ signal in proton–proton collisions at √s=8 TeV and the measurement of its production cross section. The data analysed were collected in 2012 with the ATLAS detector at the LHC and correspond to an integrated luminosity of 19.5 fb−¹. The Z→bb̄ decay is reconstructed from a pair of b -tagged jets, clustered with the anti-ktkt jet algorithm with R=0.4R=0.4, that have low angular separation and form a dijet with pT>200 GeVpT>200 GeV. The signal yield is extracted from a fit to the dijet invariant mass distribution, with the dominant, multi-jet background mass shape estimated by employing a fully data-driven technique that reduces the dependence of the analysis on simulation. The fiducial cross section is determined to be σZ→bb¯fid=2.02±0.20 (stat.) ±0.25 (syst.)±0.06 (lumi.) pb=2.02±0.33 pb, in good agreement with next-to-leading-order theoretical predictions