Micro-ESR:微型电子自旋共振光谱仪

电子自旋共振光谱(ESR),又称顺磁共振光谱(EPR),是直接检测自由基、引起石油氧化降解含有未成对电子的活性分子以及食物的唯一方法,也在生物化学研究疾病方面起着一定的作用。本文所描述的微型、高灵敏度的ESR光谱仪通过显著降低光谱技术的成本,能够为工业和科学研究者扩大ESR光谱学的实用范围。     

Village Tolerance of Abuse,Women's Status,and the Ecology of Intimate Partner Violence in Rural Uttar Pradesh,India

We explore the multilevel determinants of intimate partner violence (IPV) against women in rural Uttar Pradesh, India. We focus on village tolerance of abuse and its ability to regulate the effects of individual and village‐level women's status and social capital. Using individual and village data from the 1998 to 1999 India National Family Health Survey, we find that village tolerance and women's status at individual and village levels help explain the risk of IPV. Village tolerance of abuse also moderates the ability of village‐level women's status and social capital to protect women from IPV. Results underscore the need to understand processes that sustain and/or challenge violence‐legitimating norms.     

The many (distinctive) faces of leadership: Inferring leadership domain from facial appearance

Previous research has shown that people form impressions of potential leaders from their faces and that certain facial features predict success in reaching prestigious leadership positions. However, much less is known about the accuracy or meta-accuracy of face-based leadership inferences. Here we examine a simple, but important, question: Can leadership domain be inferred from faces? We find that human judges can identify business, military, and sports leaders (but not political leaders) from their faces with above-chance accuracy. However, people are surprisingly bad at evaluating their own performance on this judgment task: We find no relationship between how well judges think they performed and their actual accuracy levels. In a follow-up study, we identify several basic dimensions of evaluation that correlate with face-based judgments of leadership domain, as well as those that predict actual leadership domain. We discuss the implications of our results for leadership perception and selection.     

Assessment of the Effect of Population and Diary Sampling Methods on Estimation of School‐Age Children Exposure to Fine Particles

Population and diary sampling methods are employed in exposure models to sample simulated individuals and their daily activity on each simulation day. Different sampling methods may lead to variations in estimated human exposure. In this study, two population sampling methods (stratified‐random and random‐random) and three diary sampling methods (random resampling, diversity and autocorrelation, and Markov‐chain cluster [MCC]) are evaluated. Their impacts on estimated children's exposure to ambient fine particulate matter (PM_2.5) are quantified via case studies for children in Wake County, NC for July 2002. The estimated mean daily average exposure is 12.9 μg/m³ for simulated children using the stratified population sampling method, and 12.2 μg/m³ using the random sampling method. These minor differences are caused by the random sampling among ages within census tracts. Among the three diary sampling methods, there are differences in the estimated number of individuals with multiple days of exposures exceeding a benchmark of concern of 25 μg/m³ due to differences in how multiday longitudinal diaries are estimated. The MCC method is relatively more conservative. In case studies evaluated here, the MCC method led to 10% higher estimation of the number of individuals with repeated exposures exceeding the benchmark. The comparisons help to identify and contrast the capabilities of each method and to offer insight regarding implications of method choice. Exposure simulation results are robust to the two population sampling methods evaluated, and are sensitive to the choice of method for simulating longitudinal diaries, particularly when analyzing results for specific microenvironments or for exposures exceeding a benchmark of concern.     

Community well-being as a critical component of urban lake ecosystem health

Urban lakes are often monitored and managed with limited consideration of adjacent communities. Generally, when communities are considered in relation to urban lakes, they are viewed simply as sources of pollutants. Given the inevitable interactions between an urban lake and the surrounding inhabitants, the community must be considered explicitly when assessing the ecosystem health of urban lakes, as the two entities intrinsically comprise interrelated parts of a single ecosystem. In this study, the reciprocal links between a residential community and a series of urban lakes in South East Queensland have been examined to facilitate a dynamically linked, fully integrated ecosystem health assessment of constructed urban lakes. Residents’ attitudes towards, and values derived from, a series of urban lakes were surveyed, as well as residents’ behaviours which may impact upon urban lake health. The results indicate that residents derive both tangible and intangible benefits from the urban lakes, but feel little responsibility for lake health or custodianship over the lakes. Greater recognition within urban lake management frameworks of the links between urban lake systems and their surrounding communities may help to foster and enhance both community well-being, a greater sense of custodianship for such systems and improved management.     

Critical phenomena in complex contagions

Why do some contagions “go viral” and others do not? Research on “small world” networks (Watts and Strogatz, 1998) shows how a very small number of long-range ties that bridge between clusters can allow contagions to spread almost as rapidly as on a random network of equal density. Recent research shows how long-range ties that accelerate the spread of information and disease can impede the spread of complex contagions—behaviors, beliefs and preferences that diffuse via contact with multiple adopters ( Centola and Macy, 2007). In confirming this result analytically and extending the analysis from small world to power law networks, we discovered that complex contagions require a critical mass of infected nodes that corresponds to a phase transition in the ability of the contagion to take advantage of the “shortcuts” created by long-range ties. We demonstrate how this critical mass is related to the dynamics of the contagion process and identify implications for modeling behaviors that spread via social influence, such as viral marketing and social movements.     

Using national alcohol screening day to deliver personalized feedback: a pilot study

The current study tested the effectiveness of using National Alcohol Screening Day (NASD) to deliver personalized feedback via mail. At-risk NASD participants were assigned to either personalized or generic feedback conditions and attended a 4-week follow-up. Results failed to find any group differences on alcohol-related variables. However, participants in the personalized group reported a reduction in the maximum number of drinks consumed on one occasion. The personalized group also had a more accurate view of the amount of alcohol their peers consumed. NASD is a vehicle to efficiently deliver feedback to individuals about their alcohol use; however, more research is needed to determine the types of feedback that would be most effective.     

Toward a Social Theory of Resilience: Social Systems,Cultural Systems,and Collective Action in Transitioning Forest‐Based Communities

Impacts from post‐Fordist and poststaples economic transition in the Canadian natural resource sector have resulted in dramatic challenges to the livelihoods of many rural residents and the viability of many rural communities. This study seeks to understand community response to economic transition through a lens of social ecological resilience. This article puts forward Archer's theory of cultural morphogenesis as an analogous model of social ecological change that focuses attention on cultural systems, cultural elaboration, and collective action within an adaptive cycle of resilience. With case material from focused ethnographies of two forest‐dependent communities, we identify distinctive interactions between culture and agency over time that condition community response to change, and we make an analytical distinction between the social system and cultural system. These insights point to catalysts for collective action and adaptation within a resilient cultural realm that extend beyond institutional factors such as economic dependency or political opportunity. By integrating culture, we also deepen the social theory contribution to social‐ecological resilience.