Methane Destruction in an Alternating Current Plasma Reactor

Chemical Engineerin

An Estimate of Avian Mortality at Communication Towers in the United States and Canada

Avian mortality at communication towers in the continental United States and Canada is an issue of pressing conservation concern. Previous estimates of this mortality have been based on limited data and have not included Canada. We compiled a database of communication towers in the continental United States and Canada and estimated avian mortality by tower with a regression relating avian mortality to tower height. This equation was derived from 38 tower studies for which mortality data were available and corrected for sampling effort, search efficiency, and scavenging where appropriate. Although most studies document mortality at guyed towers with steady-burning lights, we accounted for lower mortality at towers without guy wires or steady-burning lights by adjusting estimates based on published studies. The resulting estimate of mortality at towers is 6.8 million birds per year in the United States and Canada. Bootstrapped subsampling indicated that the regression was robust to the choice of studies included and a comparison of multiple regression models showed that incorporating sampling, scavenging, and search efficiency adjustments improved model fit. Estimating total avian mortality is only a first step in developing an assessment of the biological significance of mortality at communication towers for individual species or groups of species. Nevertheless, our estimate can be used to evaluate this source of mortality, develop subsequent per-species mortality estimates, and motivate policy action

Reproductive performance and diving behaviour share a common sea-ice concentration optimum in Adélie penguins (Pygoscelis adeliae)

This study was financially supported by the following institutions: the WWF-UK through R. Downie, the Japanese Mombukagakusho and the Japanese Society for the Promotion of Science, the Zone Atelier Antarctique et Subantarctique –LTER France of the CNRS.The Southern Ocean is currently experiencing major environmental changes, including in sea‐ice cover. Such changes strongly influence ecosystem structure and functioning and affect the survival and reproduction of predators such as seabirds. These effects are likely mediated by reduced availability of food resources. As such, seabirds are reliable eco‐indicators of environmental conditions in the Antarctic region. Here, based on 9 years of sea‐ice data, we found that the breeding success of Adélie penguins (Pygoscelis adeliae) reaches a peak at intermediate sea‐ice cover (ca. 20%). We further examined the effects of sea‐ice conditions on the foraging activity of penguins, measured at multiple scales from individual dives to foraging trips. Analysis of temporal organisation of dives, including fractal and bout analyses, revealed an increasingly consistent behaviour during years with extensive sea‐ice cover. The relationship between several dive parameters and sea‐ice cover in the foraging area appears to be quadratic. In years of low and high sea‐ice cover, individuals adjusted their diving effort by generally diving deeper, more frequently and by resting at the surface between dives for shorter periods of time than in years with intermediate sea‐ice cover. Our study therefore suggests that sea‐ice cover is likely to affect the reproductive performance of Adélie penguins through its effects on foraging behaviour, as breeding success and most diving parameters share a common optimum. Some years, however, deviated from this general trend, suggesting that other factors (e.g. precipitation during the breeding season) might sometimes become preponderant over the sea‐ice effects on breeding and foraging performance. Our study highlights the value of monitoring fitness parameters and individual behaviour concomitantly over the long‐term to better characterize optimal environmental conditions and potential resilience of wildlife. Such an approach is crucial if we want to anticipate the effects of environmental change on Antarctic penguin populations.PostprintPeer reviewe

Contractor Incentives for Success in Implementing Performance-Based Logistics: A Progress Report

Proceedings Paper (for Acquisition Research Program)In implementing performance-based logistics (PBL), the need for several resources like inventory investment decreases. Therefore, the contractor''s profit, which was based on the level of these resources, may decrease. Therefore, a contractor may have disincentives to implement and use PBL. One way to handle such a situation is to develop financial models to assist with profit/cost sharing during the implementation of PBL. Another way is to study the broader topic of contractor incentives in PBL to find appropriate ways to motivate the contractors to enhance their performance. While most literature in PBL mentions the importance of contractor incentives, not much research has been conducted in this topic. With such situations in mind, this research program proposes a framework to study and develop appropriate possible contractor incentives to succeed in the PBL environment. Our proposed framework considers the possibility of financial and non-financial contractor incentives to ensure PBL success. We anticipate that the final results of this research program will be useful in the defense and related public- and private-sector organizations to maximize the overall benefits of PBL projects. This paper provides a progress report in developing our proposed framework and outlines the remaining work to be completed.Naval Postgraduate School Acquisition Research ProgramApproved for public release; distribution is unlimited

Correlates of Interpersonal Ethnoracial Discrimination Among Latino Adults with Diabetes: Findings from the REACH Detroit Study

The purpose of this study is to identify the social and economic correlates of reported experiences of interpersonal ethnoracial discrimination among Latino adults in Detroit. We examine whether the correlates of interpersonal ethnoracial discrimination vary according to the domain of discrimination and compare findings for individual domains of discrimination to a composite measure of experiences of discrimination. This study suggests that the frequency of reported discrimination is moderately high, and relatively common among Latinos with diabetes who live in Detroit. The findings demonstrate that immigration and ethnicity-related factors, such as greater comfort speaking Spanish and being born in the United States, were persistent correlates of more frequent encounters of interpersonal ethnoracial discrimination. Implications for social work research and practice are presented

Effectiveness of a Community Health Worker-Led Diabetes Intervention among Older and Younger Latino Participants: Results from a Randomized Controlled Trial

Diabetes management for older Latino adults is complex, given a higher incidence of multiple coexisting medical conditions and psychosocial barriers to self-management. Community health workers (CHWs) may be effective in reducing these barriers. The REACH Detroit CHW randomized controlled intervention studies with Latino/as with diabetes found improvements in self-management behaviors and glucose control after participating in a CHW-led intervention. Using data from the REACH Detroit Partnership′s cohort 3, this study used descriptive statistics and multiple linear regression analyses to evaluate whether the six-month CHW intervention had a greater effect on older Latino/as (ages 55 and older) than younger participants between baseline and post-intervention follow-up at six months. There were significant intervention effects by age group that varied by outcome. Compared to a control group that received enhanced usual care, there were statistically significant intervention effects demonstrating greater self-efficacy scores 1.27 (0.23, 2.32); p < 0.05, and reductions in HbA1c 1.02 (−1.96, −0.07); p < 0.05, among older participants in the CHW intervention, and increases in diabetes support 0.74 (0.34, 1.13); p < 0.001; and understanding of diabetes management 0.39 (0.08, 0.70); p < 0.01 among younger participants