York University

About: York University is a education organization based out in Toronto, Ontario, Canada. It is known for research contribution in the topics: Population & Politics. The organization has 18899 authors who have published 43357 publications receiving 1568560 citations.

Jet energy measurement and its systematic uncertainty in proton-proton collisions at s√=7 TeV with the ATLAS detector

Abstract: The jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector using proton-proton collision data with a centre-of-mass energy of [Formula: see text] TeV corresponding to an integrated luminosity of [Formula: see text][Formula: see text]. Jets are reconstructed from energy deposits forming topological clusters of calorimeter cells using the anti-[Formula: see text] algorithm with distance parameters [Formula: see text] or [Formula: see text], and are calibrated using MC simulations. A residual JES correction is applied to account for differences between data and MC simulations. This correction and its systematic uncertainty are estimated using a combination of in situ techniques exploiting the transverse momentum balance between a jet and a reference object such as a photon or a [Formula: see text] boson, for [Formula: see text] and pseudorapidities [Formula: see text]. The effect of multiple proton-proton interactions is corrected for, and an uncertainty is evaluated using in situ techniques. The smallest JES uncertainty of less than 1 % is found in the central calorimeter region ([Formula: see text]) for jets with [Formula: see text]. For central jets at lower [Formula: see text], the uncertainty is about 3 %. A consistent JES estimate is found using measurements of the calorimeter response of single hadrons in proton-proton collisions and test-beam data, which also provide the estimate for [Formula: see text] TeV. The calibration of forward jets is derived from dijet [Formula: see text] balance measurements. The resulting uncertainty reaches its largest value of 6 % for low-[Formula: see text] jets at [Formula: see text]. Additional JES uncertainties due to specific event topologies, such as close-by jets or selections of event samples with an enhanced content of jets originating from light quarks or gluons, are also discussed. The magnitude of these uncertainties depends on the event sample used in a given physics analysis, but typically amounts to 0.5-3 %.

Models of job-related stress and personal achievement among consultant doctors

Abstract: The antecedents and outcomes of feelings of job-related stress and personal achievement were studied in a large sample of consultant doctors working in Scotland. In a sample of 333 doctors it was found that a tendency to use emotion-oriented coping strategies and negative appraisals of organizational changes in the practice of medicine mediated the effect of the personality dimension of Neuroticism on reported job stress. Job stress levels predicted the degree of 'burnout' experienced by doctors, i.e. their tendencies to be emotionally exhausted by their work and to dehumanize patients. Higher clinical workloads were related to higher levels of stress but also to higher feelings of personal achievement. A substantial proportion of the variance in many of the variables in the stress model was accounted for by a general tendency to experience negative emotions, closely related to Neuroticism; this general factor appeared to be similar to the recently formulated concepts of 'negative affectivity' and 'somatopsychic distress'. The personality factors of Extraversion and Conscientiousness both contributed to positive feelings of personal achievement (N = 344); the effect of Extraversion was direct, whereas the effect of Conscientiousness was mediated by a tendency to use task-oriented coping strategies. Models of the processes of stress and personal achievement were tested for acceptability using the EQS Structural Equations Program. The implications of the models for transactional theories of stress are discussed.

Teen dating violence: a meta-analytic review of prevalence rates

Abstract: Objective: The goals of the present review were to determine the prevalence of physical and sexual TDV among adolescents, obtain the rates of teen dating violence (TDV) separately by gender, and examine the potential moderation effects of age, demographics, and measurement. Method: A systematic literature search elicited 101 studies reporting rates for youth aged 13 to 18. Results: Meta-analytic combination produced an overall prevalence of 20% for physical TDV and 9% for sexual TDV. Significant variability in rates was found, with physical TDV ranging from 1% to 61% and sexual TDV ranging from <1% to 54%. Gender differences in physical TDV were significant for perpetration (boys 13% vs. girls 25%) but not for victimization (21% boys and girls). A different pattern was observed for sexual TDV with girls reporting lower rates of perpetration compared with boys (3% vs. 10%) and higher rates of victimization (14% vs. 8%). Moderator analyses revealed higher rates in samples representing higher proportions of older teens (sexual TDV), cultural minority girls (physical TDV), and disadvantaged neighborhoods (physical TDV). Studies using broad measurement tools yielded higher rates of both forms of TDV across gender. Conclusions: Basing the meta-analysis on a large pool of studies with comparable samples, 1 in 5 adolescents reported physical TDV and roughly 1 in 10 reported sexual TDV. Systematic bias in boys’ and girls’ self-reports was evident along with high variability in TDV rates across studies and significant moderator influences. These findings are suggestive of substantive methodological challenges in extant studies. The obtained rates should be cautiously interpreted and future research should address the methodological limitations of self-reported TDV, taking into consideration the potential influences of gender, demographics, age, and measurement issues when designing TDV research.

Emotional regulation and display in classroom victims of bullying: Characteristic expressions of affect, coping styles and relevant contextual factors.

Abstract: Research suggests that victims of bullying may lack skills in emotional regulation, a process which facilitates coping with provocative situations to lessen the stress of negative emotions (Cicchetti, Ackerman, & Izard, 1995). The present study examined the emotional regulation and display patterns of victims during classroom bullying episodes. Children in grades one through six were observed during free play in the winter and spring of three consecutive school years. Results of the study indicated that the coping styles observed in victims of bullying can be grouped into two distinct clusters: 1) problem-solving strategies that are associated with the de-escalation and resolution of bullying episodes; and 2) aggressive strategies that tend to perpetuate and escalate the bullying interaction. Parallels were found between victims’ and bullies’ emotional displays. Results are discussed in the context of how maladaptive emotional regulation processes may act as risk factors for chronic victimization.

Self-control and alcohol restraint: an initial application of the self-control strength model

Abstract: Individuals whose self-control strength is depleted through the prior exertion of self-control may consume more alcohol in situations that demand restraint. Male social drinkers either exerted self-control by suppressing their thoughts or did not exert self-control while doing arithmetic. They then sampled beer. Participants expected a driving test after drinking and therefore were motivated to limit their intake. Individuals who suppressed their thoughts consumed more and achieved a higher blood alcohol content than those who did arithmetic. The groups did not differ in mood, arousal, or frustration. Individuals higher in trait temptation to drink consumed more after suppressing their thoughts relative to those lower in trait temptation. Alcohol intake may be a function of temptation to drink and self-control strength.