Scheduling Updates of Probabilistic Risk Assessments: The Arkansas Nuclear One-Unit 1 Experience

This paper presents the results of a study that identified how often a probabilistic risk assessment (PRA)should be updated to accommodate the changes that take place at nuclear power plants. Based on a 7-year analysis of design and procedural changes at one plant, we consider 5 years to be the maximum interval for updating PRAs. This conclusion is preliminary because it is based on the review of changes that occurred at a single plant, and it addresses only PRAs that involve a Level 1 analysis (i.e., a PRA including calculation of core damage frequency only). Nevertheless, this conclusion indicates that maintaining a useful PRA requires periodic updating efforts. However, the need for this periodic update stems only partly from the number of changes that can be expected to take place at nuclear power plants–changes that individually have only a moderate to minor impact on the PRA, but whose combined impact is substantial and necessitates a PRA update. Additionally, a comparison of two generations of PRAs performed about 5 years apart indicates that PRAs must be periodically updated to reflect the evolution of PRA methods. The most desirable updating interval depends on these two technical considerations as well as the cost of updating the PRA. (Cost considerations, however, were beyond the scope of this study.)     

Population Density is a Key Factor in Declining Human Fertility

In studying the complex determinants of human fertility, social scientists have given little attention to population density, although reproduction has been shown to be density-dependent for a wide variety of other species. Using fixed effects models on the time series of 145 countries and controlling for key social and economic variables, we find a consistent and significant negative relationship between human fertility and population density. Moreover, we find that individual fertility preferences also decline with population density. These findings suggest that population density should be included as a variable in future studies of fertility determinants.

Portuguese Scientists’ Migration: a study on the 2008 crisis aftermath

In the economic and social aftermath of the 2008 crisis there has been an important and growing new wave of highly qualified Portuguese emigration comprising scientists. No or very few public policies have been designed to reverse this phenomenon, risking the consequences of brain drain. International literature argues that professional reasons are central to scientists’ decision to migrate, even after the 2008 crisis. Spending some time in a foreign country to study, research, or teach, is perceived as a common step in an individual academic trajectory and an advantage for a successful professional career in academia. It is also encouraged by European Union policies. Twelve individual portraits of Portuguese scientists living in central Europe reveal how important other factors are to the migration decision‐making process. These factors include the economic crisis, student mobility programmes, and the current Portuguese scientific system revision.     

Illinois's child welfare research agenda: an approach to building consensus for practice-based research

This article presents a consensus-building initiative to develop a statewide research agenda that responds to the needs of Illinois's child welfare community. Researchers conducted this process through a university-community partnership to engage those interested in child welfare services. The process and findings resulted in a living document that will guide child welfare research throughout the state. Findings of the inquiry suggest that the development of best practice models may be one of the most important contributions research can make to practice.     

University Students’ Attitudes Toward Same-Sex Parenting and Gay and Lesbian Rights in Portugal

The purpose of this study was to explore university students’ attitudes toward same-sex parenting and toward gay and lesbian rights. A total of 292 participants, aged between 18 and 27 (M = 21) responded to a questionnaire measuring attitudes toward parenting by gay men and lesbians, gay and lesbian rights, and beliefs about the etiology of homosexuality. Results revealed that the majority of students were against gay and lesbian parenting, gay and lesbian equal rights, and believed that homosexuality has a social/environmental basis. It was found that sexual prejudice is highly prevalent in Portuguese university students, and implications of these findings are discussed.     

A new value stream mapping approach for healthcare environments

Hospitals worldwide are giving a growing emphasis to the application of lean concepts in the healthcare sector, commonly known as ‘lean healthcare’. A fundamental tool that allows such implementations is the value stream mapping (VSM). The problem is that VSM models used in implementations of lean healthcare are simple adaptations of the original VSM model, which was initially directed towards manufacturing and may not always represent important support activities for the patient flow that directly impact treatment time. Within this context, this paper presents a new VSM approach for healthcare environments. This new VSM model, specifically designed for healthcare environments, contemplates all activities that directly affect the treatment time. In addition, the present paper also presents an action research in a Brazilian hospital where the proposed VSM model is compared to other VSM models found in the literature. The results shown that the proposed VSM model was able to identify some operational bottlenecks and wastes that interfere in the patient’s treatment that could not be identified by other mapping models studied.     

African American males in foster care and the risk of delinquency: the value of social bonds and permanence

Juvenile delinquency remains a significant problem for child welfare systems throughout the United States. Victims of child abuse and neglect are more likely relative to children in the general population to engage in delinquency (Ryan & Testa, 2005; Widom, 1989). Although the magnitude of this relationship is not fully understood (Zingraff, Leiter, Myers, & Johnsen, 1993), the risk of delinquency is particularly high for African American males, adolescents, and children in substitute care settings. Unfortunately little is known about the factors that connect the experiences of maltreatment and delinquency. This lack of knowledge makes it nearly impossible to decrease the risk of delinquency for children in foster care. To improve the understanding of juvenile delinquency in the child welfare system, the current study tests aspects of social control theory within the context of foster care. We focus specifically on the effects of foster parent-foster child attachment, commitment, and permanence. The results indicate that strong levels of attachment decrease the risk of delinquency for youth in foster care. Involvement with religious organizations also decreases the risk of delinquency. In contrast, perceptions of placement instability, placement with relatives, and school suspensions are associated with an increased risk of delinquency.     

Children discharged from kin and non-kin foster homes: Do the risks of foster care re-entry differ?

This study investigates whether the type of pre-discharge placement, kinship versus non-kinship foster care, has a net impact on children's likelihood of re-entering substitute care after controlling for possible selection biases through the use of regression adjustment and propensity score matching (PSM). Children in kin and non-kin foster care are compared on their rates of foster care re-entry, using bivariate comparisons and accelerated failure time (AFT) models. Lower rates of foster care re-entry after reunification from kinship homes are attributed to differences in child characteristics at removal, greater stability of kin placements, and gate-keeping functions that agencies and courts exercise over discharge and re-entry options. Children adopted from kinship and non-kinship homes exhibit similar re-entry rates, but the results for legal guardianship are mixed.     

The Thomson ISI Journal Selection Process

Abstract

For more than four decades, Thomson ISI (Institute for Scientific Information) has been committed to a fundamental mission: to provide essential products and services that enable access to and management of the highest quality, most relevant materials for all participants in the research process. In 1958, Dr. Eugene Garfield started ISI by borrowing five hundred dollars from Household Finance. Current Contents^® of Chemical, Phamaco-Medical & Life Sciences was the sole product, covering 286 journals. Today the Thomson ISI database covers more than 16,000 international journals, books, and proceedings in the sciences, social sciences, and arts and humanities. This article describes the processes and standards that result in ISI's abstracting and indexing services. Serials Review 2003; 29:210–212.