5,249 research outputs found

    Physical Activity and Psychological Well-Being: Testing Alternative Sociological Interpretations

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    This study examines the relationship between physical activity in sport and feelings of well-being, testing alternative interpretations of the relationship between these two variables. It was expected that there would be positive relationships between physical activity on the one hand and physical fitness, feelings of well-being, social interaction in the sport and exercise environment, and socioeconomic status on the other hand. It was also expected that physical fitness, social interaction, and socioeconomic status would be positively related to psychological well-being. Further, it was expected that any positive zero-order relationship of physical activity and well-being would be at least in part a result of the conjoint effects of the other variables. The analyses were conducted separately for the male and female subsamples of a large survey study of Canadian adults. The results, after controls, show a modest positive relationship of physical activity and well-being for males but no such relationship for females. The predicted independent effects of the control factors obtained for both males and females. Interpretations of the results are discussed

    Exploring Effects of School Sport Experiences on Sport Participation in Later Life

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    This paper presents findings on the relationship between high school sport participation and involvement in sport as adults. The data are provided by a survey of a large representative national sample of adult Canadians. For different age subgroups among women and men, we tested the school sport experiences hypothesis that sport involvement during the high school years contributes to later adult involvement in sport. The measurement of sport involvement in the high school years is concerned with intramural and inter-school activities. Adult sport activity has three measures: sport involvement per se, involvement in an organized setting, and competitive involvement. The results are consistent with the school experiences hypothesis. High school sport involvement, for inter-school sport activities, is a comparatively strong predictor of adult sport involvement. The effects of high school involvement persist after controlling for correlated social background factors. Moreover, the effects of school sport experiences hold across age and gender subgroups. Although diminished with temporal distance from the high school years, the effects of high school involvement nonetheless extend even to respondents aged 40–59 (i.e., those approximately 22 to 42 years beyond their school years) among both genders. Interpretations of the results are discussed

    The effect of different module configurations on the radiation tolerance of multijunction solar cells

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    The effect of different module configurations on the performance of multijunction (MJ) solar cells in a radiation environment was investigated. Module configuration refers to the electrical circuit in which the subcells of the multijunction cell are wired. Experimental data for AlCaAs, GaAs, InGaAs, and silicon single-junction concentrator cells subjected to 1 MeV electron irradiation was used to calculate the expected performance of AlGaAs/InGaAs, AlGa/silicon, GaAs/InGaAs, and GaAs/silicon Mj concentrator cells. These calculations included independent, series, and voltage-matched configurations. The module configuration was found to have a significant impact on the radiation tolerance characteristic of the MJ cells

    A comparison of the radiation tolerance characteristics of multijunction solar cells with series and voltage-matched configurations

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    The effect of series and voltage-matched configurations on the performance of multijunction solar cells in a radiation environment was investigated. It was found that the configuration of the multijunction solar cell can have a significant impact on its radiation tolerance characteristics

    Improving Einstein-Podolsky-Rosen Steering Inequalities with State Information

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    We discuss the relationship between entropic Einstein-Podolsky-Rosen (EPR)-steering inequalities and their underlying uncertainty relations, along with the hypothesis that improved uncertainty relations lead to tighter EPR-steering inequalities. In particular, we discuss how the intrinsic uncertainty in a mixed quantum state is used to improve existing uncertainty relations and how this information affects one's ability to witness EPR-steering. As an example, we consider the recent improvement (using a quantum memory) to the entropic uncertainty relation between pairs of discrete observables (Nat. Phys. 6, 659 (2010)) and show that a trivial substitution of the tighter bound in the steering inequality leads to contradictions, due in part to the fact that the improved bound depends explicitly on the state being measured. By considering the assumptions that enter into the development of a steering inequality, we derive correct steering inequalities from these improved uncertainty relations and find that they are identical to ones already developed (Phys. Rev. A, 87, 062103 (2013)). In addition, we consider how one can use the information about the quantum state to improve our ability to witness EPR-steering, and develop a new symmetric EPR-steering inequality as a result.Comment: 6 page

    Uncertainty Relation for Mutual Information

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    We postulate the existence of a universal uncertainty relation between the quantum and classical mutual informations between pairs of quantum systems. Specifically, we propose that the sum of the classical mutual information, determined by two mutually unbiased pairs of observables, never exceeds the quantum mutual information. We call this the complementary-quantum correlation (CQC) relation and prove its validity for pure states, for states with one maximally mixed subsystem, and for all states when one measurement is minimally disturbing. We provide results of a Monte Carlo simulation suggesting the CQC relation is generally valid. Importantly, we also show that the CQC relation represents an improvement to an entropic uncertainty principle in the presence of a quantum memory, and that it can be used to verify an achievable secret key rate in the quantum one-time pad cryptographic protocol.Comment: 6 pages, 2 figure

    Coming of Age in the Global Village

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    I wish to analyze in this paper three acts of violence directed against public figures: Arthur Bremer's attempt to assassinate George Wallace in 1972; John Hinckley, Jr.'s attempt to assassinate President Reagan in 1982; and Mark David Chapman's unfortunately successful attempt to kill John Lennon in 1981. Each of these three acts was inextricably bound up with popular culture, and the sensibilities of the psychotic young men who committed them were formed by popular culture

    A study of consumption decisions and wealth, individual data, political economy and theory

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    Abstract. Recent studies have used regression decomposition to analyze recent data and found that over seventy percent of the black-white wealth differences remained unexplained (See, e.g., Gittleman & Wolff 2000; Altonji, Doraszelski & Segal 2000; and Blau & Graham 1990). Their results are limited to the variation in modern data. This study contributes improved methodology and historical empirical results to the literature on economic discrimination. In this paper, (i) presents structural regression decompositions, which are modifications to methods developed by Becker (1957) and Oaxaca (1973); (ii) presents a basic empirical test when analyzing structural regression decompositions; (iii) reports the estimated sources of black-white differences in wealth directly before and after emancipation; (iv) links these findings to recent studies. Empirical estimates confirm that the size and persistence of modern black-white wealth differences have historical roots. (v) presents decision-making considerations of “individuals” in an economy with grouped individuals, owners of firms, and social planner(s), conditional on wealth constraints with applied social economic considerations.Keywords. Theory of economic discrimination, Structural regression decomposition, Wealth inequality.JEL. J70, D90, E20, C20, H50, N30

    Operational evaluation of new 435-MHz RFR facility

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    Issued as Performance and cost reports no. 1-11, Preliminary final report, and Final technical report, Project no. A-305
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