14,945 research outputs found

    HERWIRI2.1: Electroweak Corrections for Hadron Scattering

    Full text link
    We describe the program HERWIRI2.1, which implements order alpha-squared photonic radiative corrections exponentiated at the amplitude level (initial state, final state, and initial-final interference) and electroweak corrections to the matrix element by generating events using the KK Monte Carlo to generate the hard process, with quark initial states generated according to PDFs via an LHAPDF interface. The events can be showered internally using HERWIG6.5 or exported and showered using any desired external showering program. Some early results are shown, including comparisons to HERWIG6.5 and HORACE 3.1.Comment: 9 pages, 12 figures. Presented by S. Yost at Loops and Legs in Quantum Field Theory, 24-29 April 2016, Leipzig, German

    Precision Electro-Weak and Hadronic Luminosity Calculations

    Full text link
    We have used YFS Monte Carlo techniques to obtain per-mil level accuracy for the Bhabha scattering cross section used in the luminosity monitor in electro-weak scattering experiments. We will describe techniques for extending these methods for use in the W production luminosity cross section for hadron colliders.Comment: 8 pages (LaTex) with 5 figures (EPS). Presented by S.A. Yost at the Third International Symposium on Quantum Theory and Symmetries, Cincinnati, Sept. 10 - 14, 200

    Analysis and Modification of Unprogrammed Reinforcement Contingencies in a Hospital for the Developmentally Disabled

    Get PDF
    36 leaves. Advisor: W. Scott WoodThe problem: To design a reliable observation system for monitoring of hospital attendants' on-ward interactions with hospital residents and to increase the rate of positive consequences delivered by the attendants for appropriate resident behaviors. Procedure: An on-ward interaction recording system was developed and tested for reliability by camparing observation data with data obtained by trained independent observers. Following baseline observations, six hospital attendants were instructed to record their delivery of positive consequences to residents. If an attendant's rate of delivery of positive consequences increased during this self-monitoring ccndition, that attendant was subsequently returned to baseline observation conditions as a reversal procedure. If an attendant's rate of delivery of positive consequences had not increased during self-monitoring, that attendant was then given feedback and praised for increases in the rate of delivery of positive consequences delivered. All attendants in the self-monitoring-plus-praise condition were then returned to baseline conditions as a reversal procedure. Findings: Results showed an inter-observer agreement of 80% for the on-ward observation system. Five of the six attendants increased their rates of delivery of positive consequences for appropriate resident behaviors when the attendants recorded their delivery of these positive consequences. The other attendant increased her rate when feedback and praise were added. Two of the five self-monitored attendants further increased their rates of positive consequences delivers when feedback and praise were added. Three of the six attendants increased their rates of successful attempts to change resident behaviors which paralleled their changes in positive consequences delivers. Conclusion: It was concluded that a reliable system for monitoring on-ward interactions between attendants and residents can be developed and that self-monitoring procedures can be used effectively with attendants to increase the rates of positive consequences delivered to residents for appropriate behavior. Recommendations: Further research would include the self-monitoring of other interaction behaviors specified in the current interaction analysis system. Longer periods of implementation may increase the effects of the self-monitoring procedure. More extensive training and feedback might increase inter-observer agreement with the interaction analysis system

    Suppressing sensorimotor activity modulates the discrimination of auditory emotions but not speaker identity

    Get PDF
    Our ability to recognize the emotions of others is a crucial feature of human social cognition. Functional neuroimaging studies indicate that activity in sensorimotor cortices is evoked during the perception of emotion. In the visual domain, right somatosensory cortex activity has been shown to be critical for facial emotion recognition. However, the importance of sensorimotor representations in modalities outside of vision remains unknown. Here we use continuous theta-burst transcranial magnetic stimulation (cTBS) to investigate whether neural activity in the right postcentral gyrus (rPoG) and right lateral premotor cortex (rPM) is involved in nonverbal auditory emotion recognition. Three groups of participants completed same-different tasks on auditory stimuli, discriminating between the emotion expressed and the speakers' identities, before and following cTBS targeted at rPoG, rPM, or the vertex (control site). A task-selective deficit in auditory emotion discrimination was observed. Stimulation to rPoG and rPM resulted in a disruption of participants' abilities to discriminate emotion, but not identity, from vocal signals. These findings suggest that sensorimotor activity may be a modality-independent mechanism which aids emotion discrimination. Copyright © 2010 the authors

    Understanding the effects of violent video games on violent crime

    Get PDF
    Psychological studies invariably find a positive relationship between violent video game play and aggression. However, these studies cannot account for either aggressive effects of alternative activities video game playing substitutes for or the possible selection of relatively violent people into playing violent video games. That is, they lack external validity. We investigate the relationship between the prevalence of violent video games and violent crimes. Our results are consistent with two opposing effects. First, they support the behavioral effects as in the psychological studies. Second, they suggest a larger voluntary incapacitation effect in which playing either violent or non-violent games decrease crimes. Overall, violent video games lead to decreases in violent crime. --Video Games,Violence,Crime

    (Chloromethyl)pentacarbonylmanganese(I): a crystal structure with a non-crystallographic centre of symmetry

    Get PDF
    There are two molecules in the asymmetric unit of the P2₁/c unit cell of ClCH₂Mn(CO)₅, the first halomethyl complex of manganese to be structurally determined. The molecules are crystallographically independent, despite an apparent local centre of symmetry. The average bond parameters include Mn–Calkyl 2.128(8) Å, C–Cl 1.811(8) Å and Mn–C–Cl 116.4(4)

    A Survey for Outer Satellites of Mars: Limits to Completeness

    Full text link
    We surveyed the Hill sphere of Mars for irregular satellites. Our search covered nearly the entire Hill Sphere, but scattered light from Mars excluded the inner few arcminutes where the satellites Phobos and Deimos reside. No new satellites were found to an apparent limiting red magnitude of 23.5, which corresponds to radii of about 0.09 km using an albedo of 0.07.Comment: 5 figures (1 color), 2 Tables, to appear in AJ Nov. 200
    corecore