PCBs in Construction Materials: Old Chemical,New Context

U.S. regulations have historically focused on control of liquid polychlorinated biphenyls (PCBs). Nonliquid PCBs present as plasticizers in some construction materials were generally viewed as immobile and not of public health or environmental concern. By the 2000s, nonliquid PCBs began receiving significant regulatory attention, particularly in schools. More recently, PCB-containing construction materials at commercial and industrial facilities are also receiving increased attention. This article highlights the drivers that have led to the increased focus on nonliquid PCBs in construction materials and why this trend is likely to continue, and highlights some of the complexities that can arise for stakeholders.     

Progrssive Regrimes, Partnerships and the Involvement of Local Communities: A Framework for Evaluation

This paper examines the nature of community involvement in urban politics as it is played out through regeneration partnerships. At a theoretical level, it explores the potential for a community dimension to local governance, that is, a strategic influence for communities within local power structures. It is argued that the nature of involvement can be explicated by considering three concepts: power (as expressed by urban regime theory), participation and partnership. The paper explores these three broad themes and then focuses on the particular issues pertaining to community involvement in partnership working. Building on this frame-work, the paper develops a model – a 'wheel of involvement'– for analysing the effectiveness of community involvement in regeneration partnerships. This model enables the effectiveness of involvement to be 'quantified by the use of a simple questionnaire survey. It provides a tool for academic researchers and practitioners concerned with evaluating partnerships to begin to explore the quality and level of community involvement in the process of urban renewal. The results of an analysis of two regeneration partnerships are presented as an illustration of the efficacy of the evaluative technique.     

Patterns of Aggressive Behavior and Peer Victimization from Childhood to Early Adolescence: A Latent Class Analysis

The developmental period characterized by the transition from childhood and elementary school to early adolescence and middle school has been associated with increases in aggressive behavior and peer victimization. Few longitudinal studies, however, have examined the stability of aggression and victimization during this critical transition. This study uses latent class analysis (LCA) to examine patterns of aggressive behavior and victimization during the transition to middle school among urban, public school students (N = 458; Girls = 53%; Latino/a = 53%; M age at t1 = 10.2 years). Independent LCA models were conducted using self-reported data assessing subjects’ involvement in aggressive conduct and victimization during the spring semesters of grades four, five, and six. Elementary school students in the fourth grade initially belonged to one of four groups identified as aggressor, victim, aggressor-victim, and uninvolved latent classes. Contrary to prior research, membership in these classes changed significantly by the time students completed their first year of middle school with most youth participating in episodes of aggression and victimization during the transition. Six common paths that describe patterns of aggressive behavior and victimization from the last two years of elementary school to the first year of middle school were found. Findings are discussed in the context of social dominance theory and prior research that has found greater stability in aggression and victimization among early adolescents.     

Revealing information in electoral competition

Electoral competition between two expert candidates may lead to inefficient platform choices. The present paper studies electoral competition between two experts and a third uninformed candidate. The latter behaves populistically. This seemingly useless candidate restores efficiency. The paper then endogenizes information acquisition. If the information acquisition costs are low, then equilibria with (i) three expert candidates or (ii) two experts and one uninformed candidate may arise. There are costs such that the latter equilibrium is the only pure strategy equilibrium in which information is transmitted.     

Fracture patterns on the infant porcine skull following severe blunt impact

The objective of this study was to document patterns of fracture on infant porcine skulls aged 2-28 days (n = 57) because of a single, high energy blunt impact to the parietal bone with rigid (nondeformable) and compliant (deformable) interfaces. Fracture patterns were mapped using Geographic Information System software. For the same generated impact force, the rigid interface produced more fractures than the compliant interface for all ages. This study also showed that this increased level of impact energy versus an earlier study using a lower energy resulted in new sites of fracture initiation and also caused previously defined fractures that propagate into an adjacent bone. Several unique characteristics of bone and diastatic fracture were documented as a function of specimen age, impact energy, and interface. These data describe some baseline characteristics of skull fracture using an animal model that may help guide future studies from forensic case files.