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291.
Abstract The persistence of ethnic traits in both the visible agricultural landscape and the practices of established farmers in the United States has been well documented but not unchallenged. One limitation of most studies is that they have focused on relatively special populations of farmers who could be expected to have unusually strong ethnic identity. It has not been clear that ethnic background could serve as a useful variable in explaining variation in farmers' behavior in the general farm population. The present study examines the role of ethnicity in a large random sample of recent entrants into dairy farming in Wisconsin. In particular, we provide some confirmation that the farm operator's ethnic identity can be linked to differences in entry paths, current farm characteristics, and cultural beliefs in our sample. We also suggest that ethnicity plays a stronger role in affecting the resources and opportunities available to young farmers than the strategic decisions made to employ these assets.  相似文献   
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Data from two research studies concerned with disabled children who have complex health needs were analysed in relation to families' experiences of accessing short breaks (respite) services. Many families experience serious problems finding suitable services which can cater for both their child's complex health needs and their own need for significant levels of support. This paper highlights which services families were using and the difficulties of obtaining a coherent and consistent package of support. Regulatory concerns relating to the piece-meal provision of services and use of children's hospices are raised along with recommendations for improving policy and practice.  相似文献   
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Authoritative parenting has been associated with positive outcomes for children and adolescents, but less is known about the mechanisms responsible for such effects. Two longitudinal studies examined the hypothesis that the relation between authoritative parenting and adolescents’ adjustment is mediated by adolescents’ level of dispositional optimism. In Study 1, university students’ perceptions that their parents were authoritative predicted higher self‐esteem, lower depression, and better university adjustment during the students’ transition into, and throughout, university. Importantly, these relations were mediated by students’ levels of optimism. In Study 2, high school students’ perceptions that their parents were authoritative predicted higher self‐esteem and lower depression six years later when they were young adults, and these relations again were mediated by students’ level of dispositional optimism.  相似文献   
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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.  相似文献   
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