Search results for " event"
showing 10 items of 872 documents
Rare events and scaling properties in field-induced anomalous dynamics
2012
We show that, in a broad class of continuous time random walks (CTRW), a small external field can turn diffusion from standard into anomalous. We illustrate our findings in a CTRW with trapping, a prototype of subdiffusion in disordered and glassy materials, and in the L\'evy walk process, which describes superdiffusion within inhomogeneous media. For both models, in the presence of an external field, rare events induce a singular behavior in the originally Gaussian displacements distribution, giving rise to power-law tails. Remarkably, in the subdiffusive CTRW, the combined effect of highly fluctuating waiting times and of a drift yields a non-Gaussian distribution characterized by long sp…
Using Statistical and Computer Models to Quantify Volcanic Hazards
2009
Risk assessment of rare natural hazards, such as large volcanic block and ash or pyroclastic flows, is addressed. Assessment is approached through a combination of computer modeling, statistical modeling, and extreme-event probability computation. A computer model of the natural hazard is used to provide the needed extrapolation to unseen parts of the hazard space. Statistical modeling of the available data is needed to determine the initializing distribution for exercising the computer model. In dealing with rare events, direct simulations involving the computer model are prohibitively expensive. The solution instead requires a combination of adaptive design of computer model approximation…
A comparison of semiparametric approaches to evaluate composite endpoints in heart failure trials
2021
In heart failure trials efficacy is usually proven by a composite endpoint including cardiovascular death (CVD) and recurrent heart failure hospitalisations (HFH), evaluated with time-to-first-event analysis based on a Cox model. As a considerable fraction of events is ignored that way, recurrent event[for full text, please go to the a.m. URL]
Anomalous diffusion and nonlinear relaxation phenomena in stochastic models of interdisciplinary physics
2020
The study of nonlinear dynamical systems in the presence of both Gaussian and non-Gaussian noise sources is the topic of this research work. In particular, after shortly present new theoretical results for statistical characteristics in the framework of Markovian theory, we analyse four different physical systems in the presence of Levy noise source. (a) The residence time problem of a particle subject to a non-Gaussian noise source in arbitrary potential profile was analyzed and the exact analytical results for the statistical characteristics of the residence time for anomalous diffusion in the form of Levy flights in fully unstable potential profile was obtained. Noise enhanced stability …
FIRST MEASUREMENT OF THE STRANGE QUARK ASYMMETRY AT THE Z(0) PEAK
1995
A measurement of the strange quark forward-backward asymmetry at the Z0 peak was performed using 718,000 multihadronic Z0 decays collected by the DELPHI detector at LEP in 1992. The s-quark was tagged by the presence of high momentum charged kaons identified by the Ring Imaging Cherenkov detector and by Λ0;s decaying into pπ-. The s-quark purity obtained was estimated for the two hadrons to be 43%. The average s-quark asymmetry was found to be 0.131±0.035 (stat.) ±0.013 (syst.). The forward-backward asymmetry was measured for unresolved d-and s-quarks, tagged by the detection of a high energy neutron or neutral kaon in the Hadron Calorimeter. The combined d-and s-quark purity was 69% and th…
High commitment HR practices, the employment relationship and job performance: A test of a mediation model
2016
Abstract Purpose This study outlines and tests a high commitment model of human resource (HR) practices and its association with outcomes through a path including employee perceptions and attitudes, thereby seeking a new way of opening the so-called ‘black box’ between human resource management (HRM) and performance. Methodology Data were collected through a questionnaire survey with responses from 835 Spanish workers from three sectors (services, education and food manufacture). In order to test hypotheses, we conducted a path analysis. Findings High commitment HR practices were related to employee performance through the mediating effect of perceived organizational support, a fulfilled ps…
Managing satisfaction in cultural events: Exploring the role of core and peripheral product
2017
1.INTRODUCTIONSatisfaction is a key concept within the marketing discipline and specifically within the area of consumer behaviour. Satisfaction in the arts is mostly derived from a combination of three elements: the subjective and experiential aspects of the cultural product, the quality of the venue and the quality of the associated peripheral services (Hume, 2008a). According to this author, studies on satisfaction with cultural events are key to understanding customer motives to repurchase subscription which can increase the arts organization's profitability, this being a main goal of the currently complex entertainment arena.This study focuses on satisfaction among visitors of an art e…
Variaciones del drama historial en Lope de Vega
2013
Starting from the presentation of the principles underlying the current research and that link it to previous studies —principles which deal with the concept and features of drama historial (historic drama) in Lope de Vega—, the essay focuses on the distinction of two fundamental modes of drama historial: the commemoration of famous historical events on the one hand, and moral conflict analysis, almost always of private nature and exploding in specific historical circumstances, on the other hand. These two major strategies of significance, the one being characteristic of a collective memory, associated with the identity of the nascent nation, and the other one exploring private identity, th…
SUCESOS VITALES Y TENSIONES EN FAMILIAS CON HIJOS ADOLESCENTES: Life events and strains in families with teenagers
2001
Los objetivos de este estudio son: a) Describir los sucesos vitales y tensiones que afectan a los padres con hijos adolescentes, y b) Verificar las posibles diferencias en la descripción de estos sucesos por parte de los padres en función de la edad del hijo adolescente mayor: mayor o menor de 19 años. A tal fin, una muestra de 386 padres (193 matrimonios) de hijos adolescentes fueron evaluados a partir del FILE (Hernández Córdoba 1991). Resultados: a) durante el último año se da un mayor promedio de tensiones intrafamiliares, seguidas por las económicas y laborales; b) los padres con un hijo primogénito de 19 años o más experimentan más tensiones por enfermedad, y por la entrada o salida d…
Commissioning of the ATLAS Muon Spectrometer with cosmic rays
2010
The ATLAS detector at the Large Hadron Collider has collected several hundred million cosmic ray events during 2008 and 2009. These data were used to commission the Muon Spectrometer and to study the performance of the trigger and tracking chambers, their alignment, the detector control system, the data acquisition and the analysis programs. We present the performance in the relevant parameters that determine the quality of the muon measurement. We discuss the single element efficiency, resolution and noise rates, the calibration method of the detector response and of the alignment system, the track reconstruction efficiency and the momentum measurement. The results show that the detector i…