Air Toxics and Health Risks in California: The Public Health Implications of Outdoor Concentrations

Of the 188 hazardous air pollutants (HAPs) listed in the Clean Air Act, only a handful have information on human health effects, derived primarily from animal and occupational studies. Lack of consistent monitoring data on ambient air toxics makes it difficult to assess the extent of low-level, chronic, ambient exposures to HAPs that could affect human health, and limits attempts to prioritize and evaluate policy initiatives for emissions reduction. Modeled outdoor HAP concentration estimates from the U.S. Environmental Protection Agency's Cumulative Exposure Project were used to characterize the extent of the air toxics problem in California for the base year of 1990. These air toxics concentration estimates were used with chronic toxicity data to estimate cancer and noncancer hazards for individual HAPs and the risks posed by multiple pollutants. Although hazardous air pollutants are ubiquitous in the environment, potential cancer and noncancer health hazards posed by ambient exposures are geographically concentrated in three urbanized areas and in a few rural counties. This analysis estimated a median excess individual cancer risk of 2.7E-4 for all air toxics concentrations and 8600 excess lifetime cancer cases, 70% of which were attributable to four pollutants: polycyclic organic matter, 1,3 butadiene, formaldehyde, and benzene. For noncancer effects, the analysis estimated a total hazard index representing the combined effect of all HAPs considered. Each pollutant contributes to the index a ratio of estimated concentration to reference concentration. The median value of the index across census tracts was 17, due primarily to acrolein and chromium concentration estimates. On average, HAP concentrations and cancer and noncancer health risks originate mostly from area and mobile source emissions, although there are several locations in the state where point sources account for a large portion of estimated concentrations and health risks. Risk estimates from this study can provide guidance for prioritizing research, monitoring, and regulatory intervention activities to reduce potential hazards to the general population. Improved ambient monitoring efforts can help clarify uncertainties inherent in this analysis.     

Peers influence the tobacco and alcohol use of Chinese adolescents

This two-wave longitudinal study examined peer selection and influence pertaining to tobacco and alcohol use by adolescents and their friends in a sample of 854 Chinese adolescents (384 girls: mean age = 13.33 years). Participants nominated friends and self-reported their tobacco and alcohol use at seventh and again at eighth grade. Longitudinal social network analyses revealed evidence of friend influence but not selection over smoking and drinking. Boys increased their levels of smoking at rates greater than that of girls, but no sex moderation of either selection or influence was found. In interpreting these results, it is important to understand the gender norms for Chinese boys and girls and the cultural context of tobacco and alcohol use.     

认识答案

主流的观点认为,知识-wh可以还原为知识-that p,其中p恰好是标记为wh-从句的问题的答案.事实上,知识-wh包含着问题--认识-wh就是认识Q的答案p;并且,知识-that包含一个语境暗示的问题.因此,知识是与问题相关的陈述.认识就是认识答案,而是否知道答案则(部分地)依赖于问题.     

Children with disabilities in out-of-home care: Perspectives on organisational collaborations

Many contemporary support services for children and young people (CYP) in out-of-home-care have adopted a collaborative approach to service provision in order to best meet the complex needs of clients. The purpose of this study was to gain a better understanding of the perceptions of Evolve Behaviour Support Services (EBSS) frontline and managerial staff delivering services to CYP in out-of-home-care with disability and complex behaviours regarding interagency/stakeholder collaboration. Views about the number and nature of collaborative partnerships, factors which facilitate or hinder effective relationships and advantages (including unintended benefits) of collaboration were sought. Qualitative interviews with 21 participants highlighted issues around: (1) general and agency/stakeholder specific issues and barriers, and (2) benefits of collaboration. The collaborative approach to service provision was seen as greatly enhancing the effectiveness of EBSS' response and ability to meet the range of CYP's complex needs, as well as having benefits for carers and service providers. Nevertheless, difficulties with collaboration were also encountered. Frequently identified challenges included reduced stakeholder engagement, differences in professional backgrounds and practice frameworks, unequal initiation of contact and follow-up, organisational disparities, communication and information sharing problems, frequent stakeholder turnover and geographical barriers in rural/remote areas.     

Contact Between Birth and Adoptive Families During the First Year Post-Placement: Perspectives of Lesbian,Gay, and Heterosexual Parents

Despite growing visibility of lesbian- and gay-parent adoption, only one qualitative study has examined birth family contact among adoptive families with lesbian and gay parents (Goldberg, Kinkler, Richardson, & Downing, 2011). We studied adoptive parents’ (34 lesbian, 32 gay, and 37 heterosexual; N = 103 families) perspectives of birth family contact across the first year post-placement. Using questionnaire and interview data, we found few differences in openness dynamics by parental sexual orientation. Most reported some birth mother contact, most had legally finalized their adoption, and few described plans to withhold information from children. We discuss implications for clinical practice, policy, and research.     

Older Professional Women's Views on Work: A Qualitative Analysis

This qualitative study reports on the career experiences of older professional women using consensual qualitative research. Thirteen women over age 50 were interviewed regarding the influences of gender and age on work. In general, all participants reported career adaptability, and many participants also reported specific subthemes of career adaptability (i.e., concern, control, curiosity, and confidence) as resources. These subthemes denote participants' future orientation, self‐discipline as evidenced by their conscientiousness in career decisions, active information seeking, and certitude that they have the ability to solve career‐related problems. Relationships with colleagues were also considered critical, and participants acknowledged the benefits and drawbacks of being a woman and being older. These women were able to achieve flexibility and autonomy in their work and spoke about the importance of work–family balance and boundaries. Practitioners are encouraged to consider how career adaptability is manifested within the interplay between gender and age, because this can influence career counseling with older women.     

Inequalities in students’ union leadership: the role of social networks

Drawing on a national survey of students’ union officers and staff, and a series of 24 focus groups involving both union officers and institutional senior managers, this article explores the characteristics of those who take up leadership roles in their (higher education) students’ union. We show that, in several areas – and particularly in relation to gender, ethnicity and age – union leaders do not represent well the diversity of the wider student body. In explaining these inequalities, we argue that friendship groups and other peer networks play a significant role in determining who does and does not take up leadership positions. Moreover, as friendship groups are often formed on the basis of ‘differential association’ and are thus frequently socially homogenous, inequalities tend to be perpetuated. Wider institutional cultures and societal norms are also implicated.