Repositioning mothers: mothers,disabled children and disability studies

In this article we set out to review the ways in which mothers of disabled children have been portrayed within disability studies and the more broader academic literature. We argue that within disability studies mothers of disabled children occupy a liminal position because they are often not disabled and yet they can experience forms of disablism. Their experiences can differ markedly from the experiences of mothers of non‐disabled children and yet the consequences and outcomes of these experiences, such as developing a ‘special competence’ is largely overlooked. Mothers can work to effect change on behalf of their children and, in some cases, for disabled people more generally, however, this role of activist mother is largely undervalued. The review of literature presented here leads us to conclude that further research needs to be undertaken exploring and highlighting the ways in which mothers of disabled children negotiate, manage and approach their daily lives, operating within what are described by feminist scholars as oppressive mothering ideologies and disabling environments.     

Longitudinal Patterns of Nonresident Fathers’ Involvement: The Role of Resources and Relations

Using data from the Fragile Families and Child Wellbeing Study, we examined patterns of nonresident father involvement 1 and 3 years after a nonmarital birth (N = 893). Cluster analyses were used to determine patterns of involvement across different father behaviors. About half of fathers displayed low involvement when children were 1 and 3 years old, one fourth of fathers maintained high involvement, and equal remaining proportions increased or decreased involvement over time. Multinomial logistic analyses indicated that better relationships between parents were associated with consistently high versus low involvement. Better relationships with each others’ extended family also predicted remaining highly involved and increasing involvement over time. Parents’ romantic relationship status was closely associated with patterns of involvement.     

Roof–envelope ratio impact on green roof energy performance

This paper addresses the impact of roof-to-envelope ratio on overall energy savings of a green roof design over conventional roof designs. Simulations were performed using a modified version of the Environmental System Performance program simulator, developed at the University of Strathclyde. The modified design employed a model developed by Columbia University and the Goddard Institute of Space Science which models the evapotranspiritive effect of a green roof calculated using the Bowen ratio; that is, the ratio of sensible heat flux to the surrounding air to the latent heat flux resulting from evapourative energy losses. The resulting heat flux term is proportional to the external surface convection, but inversely proportional to the surface Bowen ratio, which is held constant and chosen to match experimental results obtained for a given roof design. The present study performed simulations for the month of July in a Toronto climate on square warehouse style one, two, and three-story buildings, with windows occupying 10% of the area of each wall. For the first set of simulations, the internal building load of each story was set to zero, and the roof–envelope ratio was increased by increasing the building width and length. For the final simulations, several roof–envelope ratios were chosen, and the internal load of each story was increased from 0 to 50,000 W. As the roof–envelope ratio increases, the cooling load of the upper floor for multi-story designs approaches the entire building cooling load. This indicates the importance of upper zone cooling in total building energy reductions. Furthermore, the total energy savings of a green-roofed building over a conventional roofed building were far more significant for single-story structures. A 250 × 250 m green-roof design with 50,000 W internal loading was found to have percentage energy savings of 73%, 29%, and 18%, for a one, two, and three-story design, respectively.     

Orthogonal Stiefel manifold optimization for eigen-decomposed covariance parameter estimation in mixture models

Within the mixture model-based clustering literature, parsimonious models with eigen-decomposed component covariance matrices have dominated for over a decade. Although originally introduced as a fourteen-member family of models, the current state-of-the-art is to utilize just ten of these models; the rationale for not using the other four models usually centers around parameter estimation difficulties. Following close examination of these four models, we find that two are actually easily implemented using existing algorithms but that two benefit from a novel approach. We present and implement algorithms that use an accelerated line search for optimization on the orthogonal Stiefel manifold. Furthermore, we show that the ‘extra’ models that these decompositions facilitate outperform the current state-of-the art when applied to two benchmark data sets.     

Graduate education in an age of decline

In the 1980s, sociology departments in a number of universities have been caught up in a deteriorating educational environment. Many have experienced reduced numbers of faculty and students, often becoming little more than service departments. This article looks at this process as it occurred at a midwestern university noted for its strong theoretical tradition in graduate education. How this happened and the effects it had on graduate students is the focus of this work. Barbara Ryan graduated from Washington University in St. Louis in 1986 and presently is teaching in the Department of Sociology at Northern Illinois University. Her specialty area is social movements and her dissertation was an analysis of change in the contemporary women’s movement.     

A new approach to assessing ethical conduct in scientific work

The intent of the current article is to describe the development of a new approach to the study of ethical conduct in scientific research settings. The approach presented in this article has two main components. The first component entails the development of a taxonomy of ethical events as they occur across a broad range of scientific disciplines. The second involves the identification of proximate criteria that will allow systematic and objective evaluation of ethical behaviors through low-fidelity performance simulations. Two proposed measures based on the new approach are intended to identify and measure variations in the scientific environment that might predispose certain individuals to make unethical decisions.