Woody vegetation and canopy fragmentation along a forest-to-urban gradient

To identify patterns that can be used to predict vegetation and landscape characteristics in urban environments, we surveyed the species composition and size of woody plants, as well as the landscape structure of forest canopies, along a forest-to-urban gradient near Oxford, Ohio, USA. The gradient included six sites of increasingly urban land-use: a preserve, a recreational area, a golf course, a residential subdivision, apartment complexes, and a business district. We recorded species identity and stem diameter for all woody plants greater than 3 cm diameter at breast height (DBH) to examine the distribution of individual species as well as overall community composition. We used digitized aerial photographs to compare the spatial characteristics of the forest canopy at each site. We found predictable patterns in species diversity (Shannon index), spatial heterogeneity in species composition (mean percent dissimilarity), and all measures of patch fragmentation (canopy cover and patch number and size). There were clear differences in tree density and total basal area between forested sites and developed sites, but there was little resolution among developed sites. Species richness and average DBH showed no clear pattern, suggesting that landscaping preference largely determined these values. We present a modified version of an intermediate heterogeneity model that can be used to predict diversity patterns in urban areas. We discuss probable mechanisms that led to these patterns and the potential implications for animal communities in urban environments.     

The dangers posed by saddle points, and other problems, when using central composite designs

This paper discusses two problems, which can occur when using central composite designs (CCDs), that are not generally covered in the literature but can lead to wrong decisions-and therefore incorrect models-if they are ignored. Most industrialbased experimental designs are sequential. This usually involves running as few initial tests as possible, while getting enough information as is needed to provide a reasonable approximation to reality (the screening stage). The CCD design strategy generally requires the running of a full or fractional factorial design (the cube or hypercube) with one or more additional centre points. The cube is augmented, if deemed necessary, by additional experiments known as star-points. The major problems highlighted here concern the decision to run the star points or not. If the difference between the average response at the centre of the design and the average of the cube results is significant, there is probably a need for one or more quadratic terms in the predictive model. If not, then a simpler model that includes only main effects and interactions is usually considered sufficient. This test for 'curvature' in a main effect will often fail if the design space contains or surrounds a saddle-point. Such a point may disguise the need for a quadratic term. This paper describes the occurrence of a real saddle-point from an industrial project and how this was overcome. The second problem occurs because the cube and star point portions of a CCD are sometimes run as orthogonal blocks. Indeed, theory would suggest that this is the correct procedure. However in the industrial context, where minimizing the total number of tests is at a premium, this can lead to designs with star points a long way from the cube. In such a situation, were the curvature test to be found non-significant, we could end with a model that predicted well within the cube portion of the design space but that would be unreliable in the balance of the total area of investigation. The paper discusses just such a design, one that disguised the real need for a quadratic term.     

Auditory status and experiences of abuse among college students

Studies that explore experiences of abuse among deaf or hard of hearing college students are sparse and usually focus on lifetime experiences rather than the college years. A random sample of more than 1,000 college students at a campus in Upstate New York provided the data for this study. An institute for the deaf or hard of hearing was one of the colleges at the university and provided a unique opportunity to explore experiences among this demographic. Victimization rates and experiences by auditory status--deaf and hard of hearing or hearing--were examined. Binomial regression analyses were employed and findings indicated a significant association with being deaf or hard of hearing and physical and psychological abuse at the hands of a partner. Implications for policy and future research are discussed.     

How do sex ratios in China influence marriage decisions and intra-household resource allocation?

This article examines how imbalanced sex ratios influence marriage decisions and household bargaining. Using data from the 1982 Chinese census, the traditional “availability ratio” is modified to reflect the degree to which men tend to marry women from different cohorts. This ratio reflects the average tendency of men to prefer women who are close in age to women who are several years younger than them by weighting cohort sizes using the proportion of people in the population who marry someone born in a different cohort. Given that men generally marry younger women, this ratio varies independently of the size of one’s own birth cohort. Yet, the ratio fluctuates considerably across individuals, as the sizes of birth cohorts in China vary across time and regions. This enables us to examine how variability in such ratios may influence marriage decisions and household bargaining. The findings suggest that women exercise greater bargaining power once married. Results indicate that as women become scarcer in the marriage market, they have healthier sons. Men also delay marriage, and consume less tobacco and alcohol. This paper also highlights how sensitive findings may be to using this modified weighted availability ratio rather than a traditional unweighted availability ratio.     

Men's psychological functioning in the context of women's breast cancer

Previous research indicates that men are affected when their female partners have breast cancer. However, little is known about what predicts men's psychological well-being in this context. The current investigation involved couples in which the woman had early stage breast cancer and explored the degree to which men's positive and negative well-being was related to women's well-being, women's physical symptoms, relationship functioning, and relationship duration. The findings indicate that all of these factors play a role and interact in predicting men's well-being. In particular, when women have a high level of physical symptoms, the typical associations between men's well-being with women's well-being and relationship adjustment no longer persist. Implications for working with couples addressing health problems are provided.     

Transition from home care to nursing home: unmet needs in a home- and community-based program for older adults

A major effort is under way nationally to shift long-term care services from institutional to home- and community-based settings. This article employs quantitative and qualitative methods to identify unmet needs of consumers who transition from a statewide home- and community-based service program for older adults to long-term nursing home residence. Administrative data, care manager notes, and focus group discussions identified program service gaps that inadequately accommodated acute health problems, mental health issues, and stressed family caregivers; additional unmet needs highlighted an inadequate workforce, transportation barriers, and limited supportive housing options. National and state-level policy implications are considered.     

Estimating the costs of preventive interventions

The goal of this article is to improve the practice and reporting of cost estimates of prevention programs. It reviews the steps in estimating the costs of an intervention and the principles that should guide estimation. The authors then review prior efforts to estimate intervention costs using a sample of well-known but diverse studies. Finally, the authors illustrate the principles with an example, the Family Bereavement Program. They conclude that example by discussing whether and how the costs of the intervention might differ when implemented in a real-world setting.     

Mixed-Mode Contacts In Web Surveys: Paper is Not Necessarily Better

This paper investigates the impact of paper and email contactson web survey response rates. We use six combinations of paperand email prenotifications and reminders to test the impactof mixed-mode contacts. In addition, we use two survey samplesthat differ in their relationship with the sponsoring institutionto test if the impact of contact mode is conditional on relationshipbetween respondents and the survey researchers. Contrary toprevious research, we find little differences in response ratesacross experimental groups.     

Social Work Intellectuals in the Twenty‐First Century: Critical Social Theory,Critical Social Work and Public Engagement

Frequently, observation of social work students in ‘live’ work is absent or haphazard. An overview of the key literature examines the need for observation of students during training, explores the strengths and challenges of live supervision and describes a planned process for conducting live supervision. This approach incorporates four phases: collaborative preparation for a session of direct practice; observation of the student's work by a field educator; debriefing and feedback; and the development of a plan for further learning steps. Brief vignettes are used to illustrate the process. The article is enriched by the inclusion of student comments from the evaluations undertaken after live supervision activities.