825 research outputs found
Plain cigarette packs do not exert Pavlovian to instrumental transfer of control over tobacco-seeking
Journal ArticleResearch Support, Non-U.S. Gov'tCopyright © 2014 The Authors. Addiction published by John Wiley & Sons Ltd on behalf of Society for the Study of AddictionAIMS: To gain insight into the potential impact of plain tobacco packaging policy, two experiments were undertaken to test whether 'prototype' plain compared with branded UK cigarette pack stimuli would differentially elicit instrumental tobacco-seeking in a nominal Pavlovian to instrumental transfer (PIT) procedure. DESIGN, SETTING AND PARTICIPANTS: Two experiments were undertaken at the University of Bristol UK, with a convenience sample of adult smokers (experiment 1, n = 23, experiment 2, n = 121). MEASUREMENT: In both experiments, smokers were trained on a concurrent choice procedure in which two responses earned points for cigarettes and chocolate, respectively, before images of branded and plain packs were tested for capacity to elicit the tobacco-seeking response in extinction. The primary outcome was percentage choice of the tobacco- over the chocolate-seeking response in plain pack, branded pack and no-stimulus conditions. FINDINGS: Both experiments found that branded packs primed a greater percentage of tobacco-seeking (overall mean = 62%) than plain packs (overall mean = 53%) and the no-stimulus condition (overall mean = 52%; Ps ≤ 0.01, ŋp (2) s ≥ 0.16), and that there was no difference in percentage tobacco-seeking between plain packs and the no-stimulus condition (Ps ≥ 0.17, ŋp (2) s ≤ 0.04). Plain tobacco packs showed an overall 9% reduction in the priming of a tobacco choice response compared to branded tobacco packs. CONCLUSIONS: Plain packaging may reduce smoking in current smokers by degrading cue-elicited tobacco-seeking.British Heart FoundationCancer Research UKNIHRMRCESR
MiniAnDE: a reduced AnDE ensemble to deal with microarray data
This article focuses on the supervised classification of datasets with a
large number of variables and a small number of instances. This is the case,
for example, for microarray data sets commonly used in bioinformatics. Complex
classifiers that require estimating statistics over many variables are not
suitable for this type of data. Probabilistic classifiers with low-order
probability tables, e.g. NB and AODE, are good alternatives for dealing with
this type of data. AODE usually improves NB in accuracy, but suffers from high
spatial complexity since models, each with variables, are included in
the AODE ensemble. In this paper, we propose MiniAnDE, an algorithm that
includes only a small number of heterogeneous base classifiers in the ensemble,
i.e., each model only includes a different subset of the predictive
variables. Experimental evaluation shows that using MiniAnDE classifiers on
microarray data is feasible and outperforms NB and other ensembles such as
bagging and random forest
Diffuse Ionized Gas in the Dwarf Irregular Galaxy DDO 53
The spectral characteristics throughout the dwarf irregular galaxy DDO 53 are
studied. The results are very similar to those for other irregular galaxies:
high excitation and low values of the [SII]/Halpha ratio. The most likely
ionization source is photon leakage from the classical HII regions, without any
other source, although the interstellar medium of the galaxy is quite
perturbed. Moreover, the physical conditions throughout the galaxy do not
change very much because both the photon leakage percentage and the ionization
temperature are very similar. In addition, the determined metal content for two
HII regions indicates that DDO 53 is a low-metallicity galaxy.Comment: 32 pages, 9 figures, 7 tables. AJ, in pres
Diseño de una pieza de plástico reciclado: MetodologĂa y aplicaciĂłn
El mecanismo por el que se diseña una pieza de plástico es un proceso complejo que implica el conocimiento de las caracterĂsticas mecánicas, elĂ©ctricas y fĂsicas de la pieza y tambiĂ©n de los procesos de transformaciĂłn. La principal tarea del diseñador es traducir una serie de requerimientos e ideas previas en las direcciones y formas finales que tendrá la pieza. Para conseguirlo de forma optimizada el diseñador debe hacer uso de su experiencia, conocimientos y de una metodologĂa de diseño adecuada. El objeto de este trabajo es poner de manifiesto los pasos a seguir cuando se aborda un diseño y la aplicaciĂłn a una pieza de plástico fabricada en material reciclad
Disseny d'una peça de plà stic reciclat: Metodologia i aplicació
El disseny d'una peça de plĂ stic Ă©s un procĂ©s complex que implica el coneixement de les caracterĂstiques mecĂ niques, elèctriques i fĂsiques de la peça, i tambĂ© dels processos de transformaciĂł. La principal tasca del dissenyador Ă©s traduir una sèrie de requeriments i idees prèvies en les dimensions i formes finals de la peça. Per aconseguir-ho de manera òptima, el dissenyador ha de fer Ăşs, a banda de l'experiència i els coneixements propis, d'una metodologia de disseny adquada. L'objectiu d'aquest article Ă©s posar de manifest els passos a seguir quan s'aborda un disseny i la seva aplicaciĂł a una peça de plĂ stic fabricada en material reciclat
Análisis biomecánico de la técnica individual de los finalistas masculinos del lanzamiento de peso en el Campeonato del Mundo de Atletismo Valencia 08
El objetivo de este estudio ha sido realizar un análisis descriptivo de la tĂ©cnica individual de los ocho finalistas masculinos de lanzamiento de peso en el Campeonato del Mundo de Atletismo de Pista Cubierta, celebrado en Valencia, 2008. Para este estudio, se han utilizado tĂ©cnicas fotogramĂ©tricas tridimensionales (3D) a partir de la filmaciĂłn del gesto con dos cámaras de video sincronizadas temporalmente a 100 Hz, analizándose el mejor lanzamiento de cada atleta. Se parte de un análisis temporal, donde se ha dividido el gesto en seis fases. A partir de esas fases, se describen las gráficas de velocidad tangencial del CG y el peso con respecto al tiempo. A continuaciĂłn, se registraron los factores que determinan la trayectoria del peso durante el vuelo (factores de producto), asĂ como el compromiso de otros factores causales que determinan la eficacia del lanzamiento de peso. Además de confirmar la relaciĂłn entre los factores de producto, los resultados ponen de manifiesto que cada lanzador utiliza una secuencia temporal y ritmo de ejecuciĂłn propio e individual, confirmándose que la ejecuciĂłn tĂ©cnica del lanzamiento de peso es individual y está condicionada por caracterĂsticas antropomĂ©tricas, capacidad muscular y el grado de automatizaciĂłn de la secuencia temporal individual.The aim of this study is to make a descriptive analysis of the individual technique of the eight men finalists in the shot put in the 2008 Valencia Indoor World Championships. To do this three-dimensional photogrammetric techniques (3D) were used, filming the action with two video cameras temporally synchronized at 100 Hz. Six puts were recorded during the men’s final, subsequently analysing the longest throw of each putter. A temporal analysis was first made, dividing the throwing action into six phases. Starting from these phases, graphs of the tangential velocity of the thrower’s CG and the time taken in the shot are described. Then the factors that determine the trajectory of the shot during flight (product factors) and the contribution of the other causal factors for the efficiency of the put are recorded. As well as confirming the relation between the product factors, the results show that each thrower uses his/her own temporal sequence and rhythm of execution, confirming that the technical execution of the shot put is individual and conditioned by anthropometrical characteristics, muscular capacity and the degree of automation of the individual temporal sequence.Peer Reviewe
Particle dispersion processes in two-dimensional turbulence: a comparison with 2-D kinematic simulation.
International audienceWe study numerically the comparison between Lagrangian experiments on turbulent particle dispersion in 2-D turbulent flows performed, on the one hand, on the basis of direct numerical simulations (DNS) and, on the other hand, using kinematic simulations (KS). Eulerian space-time structure of both DNS and KS dynamics are not comparable, mostly due to the absence of strong coherent vortices and advection processes in the KS fields. The comparison allows to refine past studies about the contribution of non-homogeneous space-time 2-D Eulerian structure on the turbulent absolute and relative particle dispersion processes. We particularly focus our discussion on the Richardson's regime for relative dispersion
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