The assessment of competency and the importance of judgment

Titre de l'écran-titre (visionné le 6 mai 20090Bibliogr

Hazardous Waste: Liability of Predecessors in Title

The United States has a long history of improperly disposed toxic waste. Over the years, some enterprises that contaminated their real property through commercial activities transferred the property without abating the problem. Consequently, many subsequent purchasers unknowingly acquired contaminated property. This Comment argues that the state and federal environmental legislation is inadequate to fully compensate landowners who suffer losses as a result of toxic waste left behind by a predecessor in title. The author explores the viability of the common law doctrine of hazardous activity strict liability as a cause of action available to a landowner against a predecessor in interest

Le portfolio ou dossier d'apprentissage

Titre de l'écran-titre (visionné le 15 avril 2010

Cross-sensory correspondences:heaviness is dark and low-pitched

Everyday language reveals how stimuli encoded in one sensory feature domain can possess qualities normally associated with a different domain (e.g., higher pitch sounds are bright, light in weight, sharp, and thin). Such cross-sensory associations appear to reflect crosstalk among aligned (corresponding) feature dimensions, including brightness, heaviness, and sharpness. Evidence for heaviness being one such dimension is very limited, with heaviness appearing primarily as a verbal associate of other feature contrasts (e.g., darker objects and lower pitch sounds are heavier than their opposites). Given the presumed bi-directionality of the crosstalk between corresponding dimensions, heaviness should itself induce the cross-sensory associations observed elsewhere, including with brightness and pitch. Taking care to dissociate effects arising from the size and mass of an object this is confirmed. When hidden objects varying independently in size and mass are lifted, objects that feel heavier are judged to be darker and to make lower pitch sounds than objects feeling less heavy. These judgements track the changes in perceived heaviness induced by the size-weight illusion. The potential involvement of language, natural scene statistics, and Bayesian processes in correspondences, and the effects they induce, is considered

Cross-sensory correspondences:cross-activation of connotative feature dimensions through the felt heaviness of lifted objects

Cross-sensory correspondences are the systematic associations demonstrated to arise between various feature dimensions such that their relative extremes are aligned. It has been proposed that correspondences arise as a result of cross-talk between abstract, amodal connotations of a core set of feature dimensions (P. Walker, 2016). Although there is some evidence to suggest that a dimension denoting heaviness may be included among a set of aligned feature dimension, the evidence to demonstrate this is limited. The present work explores whether heaviness, as received through the lifting of weighted objects, may enter into this scheme of correspondences. In addition, the separate contributions of the heaviness and size of lifted objects to the cross-activation of other feature dimensions is also considered. The influences of size and heaviness were explored in light of the size-weight illusion; a phenomenon where the size of equally weighted objects alters their felt heaviness such that the smaller object is experienced to be heavier than the larger object. A series of rating scale tasks were conducted, examining whether heaviness can induce predicted correspondences with other feature dimensions. It was demonstrated that heavier objects were consistently aligned with dark and low pitch. Further confirmation for these mappings was sought through a series of speeded classification tasks. The heaviness-brightness mapping was demonstrated to influence response speed in a brightness classification task, where objects varying in heaviness were used as response keys. In both rating scale and speeded classification tasks, the heaviness-brightness correspondence continued to form the basis of cross-sensory interactions despite the potential for a size-brightness correspondence. The present work confirms that cross-activation between dimensions can be accessed through the manipulation of felt objects. What is more, support is provided for a framework of aligned feature dimensions, their conceptual nature and the inclusion of heaviness among this proposed network of dimensions

Étude des collisions proton-proton dans l’expérience ATLAS avec les détecteurs ATLAS-MPX

Les seize détecteurs MPX constituant le réseau ATLAS-MPX ont été placés à différentes positions dans le détecteur ATLAS et sa averne au CERN dans le but de mesurer en emps réel les champs de radiation produits ar des particules primaires (protons des faisceaux) et des particules secondaires (kaons, pions, g, protons) issues des collisions proton-proton. Des films de polyéthylène (PE) et de fluorure de lithium (6LiF) recouvrent les détecteurs afin d’augmenter leur sensibilité aux neutrons produits par les particules primaires et secondaires interagissant avec les matériaux présents dans l’environnement d’ATLAS. La reconnaissance des traces laissées par les particules dans un détecteur ATLAS-MPX se fait à partir des algorithmes du logiciel MAFalda (“Medipix Analysis Framework”) basé sur les librairies et le logiciel d’analyse de données ROOT. Une étude sur le taux d’identifications erronées et le chevauchement d’amas a été faite en reconstruisant les activités des sources 106Ru et 137Cs. L’efficacité de détection des neutrons rapides a été mesurée à l’aide des sources 252Cf et 241AmBe (neutrons d’énergie moyenne de 2.13 et 4.08 MeV respectivement). La moyenne des efficacités de détection mesurées pour les neutrons produits par les sources 252C f et 241AmBe a été calculée pour les convertisseurs 6LiF et PE et donnent (0.8580 ± 0.1490)% et (0.0254 ± 0.0031)% pour LiF et (0.0510 ± 0.0061)% et (0.0591 ± 0.0063)% pour PE à bas et à haut seuil d’énergie respectivement. Une simulation du calcul de l’efficacité de détection des neutrons dans le détecteur MPX a été réalisée avec le logiciel GEANT4. Des données MPX correspondant aux collisions proton-proton à 2.4 TeV et à 7 TeV dans le centre de masse ont été analysées. Les flux détectés d’électrons et de photons sont particulièrement élevés dans les détecteurs MPX01 et MPX14 car ils sont plus près du point de collision. Des flux de neutrons ont été estimés en utilisant les efficacités de détection mesurées. Une corrélation avec la luminosité du LHC a été établie et on prédit que pour les collisions à 14 TeV dans le centre de masse et avec une luminosité de 10^34 cm-1*s-1 il y aura environ 5.1x10^8 ± 1.5x10^7 et 1.6x10^9 ± 6.3x10^7 particules détectées par les détecteurs MPX01 et MPX14 respectivement.The sixteen detectors forming the ATLAS-MPX network have been placed in different positions inside the ATLAS detector and its cavern at CERN in order to measure, in real time, the radiation fields produced by primary particles (beam protons) and secondary particles (kaons, pions, photons, protons) resulting from the proton-proton collisions. Films of polyethylene (PE) and lithium fluoride (6LiF) cover the detectors so as to increase their sensitivity to neutrons produced by the primary and secondary particles interacting with the materials present in the ATLAS environment. The tracks identification in an ATLAS-MPX detector is obtained with the algorithms of the MAFalda software (Medipix Analysis Framework) based on the libraries and data-analysis software ROOT. A study on the mistag rate and blob overlap was made by reconstructing the activities of 106Ru and 137Cs sources. The fast neutron detection efficiency was measured with the help of 252C f and 241AmBe sources (neutrons with an average energy of 2.13 and 4.08 MeV, respectively). The detection efficiency measured for neutrons produced by 252Cf et 241AmBe sources was calculated for the 6LiF and PE converters. It averaged at low and high energy respectively (0.8580 ± 0.1490)% and (0.0254 ± 0.0031)% for LiF and (0.0510 ± 0.0061)% and (0.0591 ± 0.0063)% for PE. A simulation of the neutron detection efficiency calculation in the MPX detector was carried out with the GEANT4 software. MPX data corresponding to the proton-proton collisions at 2.4 TeV and 7 TeV at the center of mass were analyzed. The detected flux of electrons and photons are particularly high in the MPX01 and MPX14 detectors because they are closer to the point of collision. Fluxes of neutrons were estimated using the measured detection efficiencies. A correlation with the luminosity of the LHC was established. We predict that for 14 TeV collisions at the center of mass, with a luminosity of 1034 cm^2*s^1, the number of particle detected by MPX01 and MPX14 respectively will be about 5.1x10^8 ± 1.5x10^7 and 1.6x10^9 ± 6.3x10^7

Comparative study of authentic scientific research versus guided inquiry in affecting middle school students' abilities to know and do genetics

This exploratory mixed methods study addressed the types of gains students made when engaged in one of two forms of inquiry. Gains were measured on three levels: conceptual understanding, the process of scientific investigation, and use of practical reasoning skills. One hundred-thirty 8th grade students from a rural public school in East Texas participated in this study. Classes of students were randomly assigned to one of two treatment groups: guided inquiry or authentic student research learning. Non parametric statistical analysis and constant comparative qualitative analysis were used to triangulate pre-tests and post-tests, student journals, and student drawings to address the research questions. Findings support greater gains in conceptual understanding of domain specific content in a highly scaffolded guided inquiry. Further authentic scientific research learning was more effective for developing understanding of scientific investigation as a process and application of knowledge through practical reasoning skills