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We demonstrate that ordered microlens arrays with 10 m diam poly-dimethyl-siloxane lenses attached to glass substrates increase the light output of organic light emitting devices ͑OLED͒ by a factor of 1.5 over unlensed substrates. The lenses, which are considerably smaller than, and not aligned to the OLEDs, outcouple light that is emitted outside of the escape cone of the substrate. We show that an electrophosphorescent device based on a fac tris͑2-phenylpyridine͒Iridium ͑Ir͑ppy) 3 ͒ doped emitting layer has its external quantum efficiency increased from 9.5% using a flat glass substrate, to 14.5% at low current densities using a substrate with microlenses. No change in the emission spectrum is observed for different viewing angles using the lens arrays.

BackgroundWomen and students of color are widely underrepresented in most STEM fields. In order to investigate this underrepresentation, we interviewed 201 college seniors, primarily women and people of color, who either majored in STEM or started but dropped a STEM major. Here we discuss one section of the longer interview that focused on students’ sense of belonging, which has been found to be related to retention. In our analysis, we examine the intersections of race and gender with students’ sense of belonging, a topic largely absent from the current literature.ResultsWe found that white men were most likely to report a sense of belonging whereas women of color were the least likely. Further, we found that representation within one’s STEM sub-discipline, namely biology versus the physical sciences, impacts sense of belonging for women. Four key factors were found to contribute to sense of belonging for all students interviewed: interpersonal relationships, perceived competence, personal interest, and science identity.ConclusionsOur findings indicate that students who remain in STEM majors report a greater sense of belonging than those who leave STEM. Additionally, we found that students from underrepresented groups are less likely to feel they belong. These findings highlight structural and cultural features of universities, as well as STEM curricula and pedagogy, that continue to privilege white males.

Wealth ownership in the United States has long been concentrated in the hands of a small minority of the population, yet researchers have paid relatively little attention to the causes and consequences of this inequality. In this essay, we review the literature that does exist on wealth accumulation and distribution. We begin with an examination of the reasons that wealth inequality has received little empirical attention. We then discuss methods of creating empirical estimates of wealth accumulation and distribution, and we present some estimates of recent trends in wealth inequality. We explore a diverse collection of research that explains these trends, covering treatments of aggregate influences and individual and household factors. We conclude the chapter with a review of research on intergenerational processes and wealth mobility.

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The upswing in economic inequality that has affected a number of advanced industrial societies in the late 20th century has been particularly conspicuous in the United States. The authors explore its causes using data on the distribution of family income in 3,098 U. S. counties in 1970, 1980, 1990, and 2000. The authors build a model of within-county income inequality that assumes that distribution processes involving labor market and sociodemographic variables operate primarily at the county level and those involving the political and institutional context operate primarily at the state level. Multilevel methods are used to distinguish county cross-sectional, state cross-sectional, and longitudinal effects on inequality. The authors find that, when features of the state-level institutional and political context are associated with inequality, these effects are larger longitudinally than cross-sectionally. A range of other factors, including economic development, labor force changes, shifts in the racial/ethnic and gender composition of the labor force, educational expansion, and urbanization are found to have comparatively large effects, both longitudinally and cross-sectionally. INEQUALITY TRENDS IN THE LATE 20TH CENTURYOne of the most intriguing socioeconomic trends of the last decades of the 20th century is the upswing in income inequality that was first noted 1 The authors would like to acknowledge the helpful comments and suggestions of Phil Gibbs, David Lowery, the late Rachel Rosenfeld, John Stephens, and the AJS reviewers. Direct all correspondence to Stephanie Moller,

Work-family policy strategies reflect gendered assumptions about the roles of men and women within families and therefore may lead to significantly different outcomes, particularly for families headed by single mothers. The authors argue that welfare states have adopted strategies based on different assumptions about women's and men's roles in society, which then affect women's chances of living in poverty cross-nationally. The authors examine how various strategies are associated with poverty rates across groups of women and also examine more directly the effects of specific work-family policies on poverty rates. They find that while family benefits and child care for young children unequivocally lower poverty rates, particularly for families headed by a single mother, long parental leaves have more ambivalent effects. The findings suggest that it is critical to examine the gendered assumptions underlying work-family policies rather than viewing all work-family policies as the same.

Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte.