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891.
Daniel M. Byrd III Donald O. Allen Robert L. Beamer Henry R. Besch Jr. David B. Bylund John Doull William W. Fleming Arthur Fries F. Peter Guengerich Roger Hornbrook Louis Lasagna Bert K. B. Lum Elias K. Michaelis Edward T. Morgan Alan Poland Karl K. Rozman J. Bryan Smith Hollie I. Swanson William Waddell James D. Wilson 《Risk analysis》1998,18(1):1-2
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894.
Stewart Clegg: Towards a Machiavellian organization theory? 总被引:1,自引:0,他引:1
895.
896.
The item factor analysis model for investigating multidimensional latent spaces has proved to be useful. Parameter estimation in this model requires computationally demanding high-dimensional integrations. While several approaches to approximate such integrations have been proposed, they suffer various computational difficulties. This paper proposes a Nesting Monte Carlo Expectation-Maximization (MCEM) algorithm for item factor analysis with binary data. Simulation studies and a real data example suggest that the Nesting MCEM approach can significantly improve computational efficiency while also enjoying the good properties of stable convergence and easy implementation. 相似文献
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898.
Masters athletes are typically older than 35 years of age and systematically train for, and compete in, organized forms of
sport specifically designed for older adults. They are motivated to participate in masters sport for a wide variety of reasons.
Age-related declines in endurance performance are observed across the endurance sports of running, orienteering, rowing, and
swimming. These declines are curvilinear from age 35 years until approximately age 60–70 years and exponential thereafter.
The decline in endurance performance appears primarily due to an age-related decrease in VO2max secondary to an age-related decrease in HRmax and possible age-related declines in stroke volume and arteriovenous oxygen difference. While performance velocity at lactate
threshold decreases with age in masters endurance athletes, it appears to increase relative to VO2max while exercise economy is maintained. There also appears an age-related decrease in active muscle mass, type II muscle fiber
size, and blood volume that contribute to decreased endurance performance. However, research suggests that maintenance of
training intensity and volume into older age may mediate the rate of age-related decline in VO2max, stroke volume, arteriovenous oxygen difference, blood volume, and muscle mass in masters endurance athletes. 相似文献
899.
Peter Brandon 《International migration (Geneva, Switzerland)》2008,46(2):49-80
Using data from Australia, health behavior outcomes and the social connectedness of adolescents in immigrant families are contrasted with the outcomes of adolescents in non‐immigrant families. Findings suggest that first and second generation adolescents are less likely to drink alcohol and lack social support than third generation adolescents, but more likely not to be physically active and not to have membership to a social club or group than third generation adolescents. Second generation adolescents are more likely to smoke than third generation adolescents. Findings suggest that immigrant adolescents appear protected from negative risks, yet at the same time, do not benefit from Australia's cultural traditions for physical activity and social participation. Across generations, however, social participation and physical activity increase. Lastly, as length of time in Australia increases, the protective effect of the immigrant family against some negative risks wanes. Overall, the assimilation process leads adolescents in immigrant families to adopt Australia's prevailing social customs of health and social behaviors. 相似文献
900.
Sponsored day care is the term generally used to describe the purchase of places by local authorities in independent day care services (such as childminders, nurseries and playgroups) for children in need. This paper considers the development and operation of sponsored day care services in 12 English local authorities, in the context of current policy developments within early childhood services. It suggests that provision for children in need is in danger of being marginalised by the current focus on early education and child care for working parents, and highlights the importance of developing services for children in need within an overall strategy for children's services. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献