Polymer Brushes under High Load

Polymer coatings are frequently used to provide repulsive forces between surfaces in solution. After 25 years of design and study, a quantitative model to explain and predict repulsion under strong compression is still lacking. Here, we combine experiments, simulations, and theory to study polymer coatings under high loads and demonstrate a validated model for the repulsive forces, proposing that this universal behavior can be predicted from the polymer solution properties

Using microphone arrays to investigate microhabitat selection by declining breeding birds

Understanding the microhabitat preferences of animals can help managers to develop better conservation and recovery strategies but this is challenging. Traditional methods are limited by cost, accuracy and human resources. In this study, we investigated avian microhabitat preferences using microphone arrays that are capable of accurately locating vocalizing birds. Our objective was to identify the microhabitat associations of two common species in steep population decline, the Boreal Chickadee Poecile hudsonicus and the Cape May Warbler Setophaga tigrina. We deployed 68 eight‐channel arrays at random locations in Labrador, Canada, during the 2016 avian breeding season. We returned in 2017 to the 18 array locations where the target species had been detected the previous year and characterized the microhabitat at the exact locations where they had been detected. We also characterized the microhabitat at randomly determined control locations. Results show that Boreal Chickadees select trees with greater diameter‐at‐breast‐height that are surrounded by greater stem density. We did not find evidence that Cape May Warblers exhibit microhabitat selection during song production. The study shows that microphone arrays are an effective tool for identifying preferred microhabitat that could be incorporated into future conservation or recovery strategies

The measurement of sustainability disclosure: Abundance versus occurrence

Content analysis (disclosure abundance) and disclosure indices (disclosure occurrence) are popular methods for measuring the extent of disclosure. Few studies however compare the two approaches empirically or use empirical evidence to justify the use of one approach over the other. A study of sustainability reporting on Malaysian local government websites is used to illustrate how these two measurement approaches lead to different concepts of the extent of disclosure. Furthermore, hypothesised relationships between disclosure and independent variables based on theory differ substantially depending on the measurement approach for disclosure. Recommendations for the measurement of disclosure are suggested

The impact of culture and governance on corporate social reporting

NoOur aim is to increase understanding of the potential effects of culture and corporate governance on social disclosures. The ethnic background of directors and shareholders is used as a proxy for culture. Corporate governance characteristics include board composition, multiple directorships and type of shareholders. The dependent variable, disclosure in annual reports of Malaysian corporations, is measured by an index score as well as in terms of number of words. Our results indicate a significant relationship between corporate social disclosure and boards dominated by Malay directors, boards dominated by executive directors, chair with multiple directorships and foreign share ownership. Four of the control variables (size, profitability, multiple listing and type of industry) were significantly related to corporate social disclosure with the exception of gearing. This study has public policy implications for Malaysia as well as a number of other countries in the Asia¿Pacific region