An Empirical Approach for Deriving Information on Total Duration of Exposure from Information on Historical Exposure

Exposure duration is an important component in determining long-term dose rates associated with exposure to environmental contaminants. Surveys of exposed populations collect information on individuals' past behaviors, including the durations of a behavior up to the time of the survey. This paper presents an empirical approach for determining the distribution of total durations that is consistent with the distribution past durations obtained from surveys. This approach is appropriate where the rates of beginning and ending a behavior are relatively constant over time. The approach allows the incorporation of information on the distribution of age in a population into the determination of the distribution of durations. The paper also explores the impact of "longevity" bias on survey data. A case study of the application of this approach to two angler populations is also provided. The results of the case study have characteristics similar to the results reported by Israeli and Nelson ( Risk Anal. 12, 65-72 (1992)) from their analytical model of residential duration. Specifically, the average period of time for the total duration in the entire population is shorter than the average period of time reported for historical duration in the surveyed individuals.     

The English language fluency and occupational success of ethnic minority immigrant men living in English metropolitan areas

This paper examines two crucial aspects of the assimilation experience of ethnic minority immigrants in the United Kingdom. It explores the determinants of their English language (speaking) fluency and the key role such skills play in their occupational success. Our sample is derived from the Fourth National Survey of Ethnic Minorities undertaken in 1994. Uniquely this data contains an interviewer-assessed measure of English language fluency. Importantly, we also attempt to control for possible endogeneity bias in the estimates of the effect of language fluency on occupational success. We find that fluency is associated with significantly higher mean hourly occupational wages. Received: 26 November 1999/Accepted: 03 August 2000     

Reliant behavior in the United States and Japan

Japanese economic success is often attributed to culturally reinforced psychological conditioning that promotes interpersonal reliance, cooperation, and a group interest orientation. This article provides direct experimental evidence on differences in behavior among future business people in the United States and Japan. Utilizing a simple, two person extensive form game of perfect information introduced by Selten (1975), we provide evidence that, contrary to some views, the Japanese can be less reliant on the behavior of others and are more likely to take actions at variance with group welfare in some settings. Thus, popular explanations of Japanese economic achievements may require further exploration.     

Covariate adjustment in partial least squares (PLS) regression for the extraction of the spatial–temporal pattern from positron emission tomography data

Positron emission tomography (PET) imaging can be used to study the effects of pharmacologic intervention on brain function. Partial least squares (PLS) regression is a standard tool that can be applied to characterize such effects throughout the brain volume and across time. We have extended the PLS regression methodology to adjust for covariate effects that may influence spatial and temporal aspects of the functional image data over the brain volume. The extension involves multi-dimensional latent variables, experimental design variables based upon sequential PET scanning, and covariates. An illustration is provided using a sequential PET data set acquired to study the effect of d-amphetamine on cerebral blood flow in baboons. An iterative algorithm is developed and implemented and validation results are provided through computer simulation studies.     

Women and plant closings: Unemployment,re-employment,and job training enrollment following dislocation

Major changes in the U.S. economy are leaving blue collar women vulnerable to extended unemployment, permanent job loss, or re-employment at lower wage and benefit levels. Consequently, retraining for other jobs may be a virtual necessity. Information about factors associated with women's employment status after job loss may be useful to policy makers and program planners providing assistance or training to dislocated women. This study of women workers, who are dislocated from jobs in textile and apparel plants in Georgia, identifies the differences between women who are unemployed, re-employed, or enrolled in job training programs following job loss. Findings suggest that stage of the family life cycle and the demands of combining production work and family responsibilities contribute to women's experience of unemployment and their labor market participation.     

Physical activity and cognitive-health content in top-circulating magazines, 2006-2008

Physical activity may promote cognitive health in older adults. Popular media play an important role in preventive health communication. This study examined articles discussing associations between physical activity and cognitive health in top-circulating magazines targeting older adults. 42,753 pages of magazines published from 2006 to 2008 were reviewed; 26 articles met inclusion criteria. Explanations regarding the link between physical activity and cognitive health were provided in 57.7% of articles. These explanations were generally consistent with empirical evidence; however, few articles included empirical evidence. Physical activity recommendations were presented in 80.8% of articles; a wide range was recommended (90-300 min of physical activity per wk). Socioeconomic status and education level were not mentioned in the text. Results suggest an opportunity for greater coverage regarding the role of physical activity in promoting cognitive health in popular media. Magazine content would benefit from including more empirical evidence, culturally sensitive content, and physical activity recommendations that are consistent with U.S. guidelines.     

Developing Employment Opportunities for Care Leavers

This article describes an action research project carried out in North West England that aimed to assist Children’s Services Departments and Care Trusts in developing their strategies for supporting care leavers into employment and training. The study found a range of models and approaches that can be utilised to develop local and regional partnerships offering employment and training opportunities designed to meet the needs of care leavers. Relevant questions about the extent to which such opportunities should be ring‐fenced or targeted on particular fields of employment are identified. © 2010 The Author(s). Children & Society © 2010 National Children’s Bureau.     

Family touch practices and learning experiences in the museum

ABSTRACT

This paper investigates how family museum visitors crafted learning through interaction with one another and the touch objects of an exhibition. Through a case study of seven families’ interaction, we show how families used touch to bring their interests and resources into dialogue with museum expectations and resources. Using a multimodal approach to analyze observational data, we generate a fine-grained account of differently configured family touch practices and ways of experiencing and knowing objects through their material, sensory tactile and affective qualities. We conclude by highlighting how our findings can inform the design of touch exhibits to support family learning, with attention to engagement, narrative creation, and embodied learning, and point to the paper’s methodological contribution to the analysis of visitor situated real-time interaction and learning in museums.