35,988 research outputs found
Topology of the Galaxy Distribution in the Hubble Deep Fields
We have studied topology of the distribution of the high redshift galaxies
identified in the Hubble Deep Field (HDF) North and South. The two-dimensional
genus is measured from the projected distributions of the HDF galaxies at
angular scales from to . We have also divided the samples into
three redshift slices with roughly equal number of galaxies using photometric
redshifts to see possible evolutionary effects on the topology.
The genus curve of the HDF North clearly indicates clustering of galaxies
over the Poisson distribution while the clustering is somewhat weaker in the
HDF South. This clustering is mainly due to the nearer galaxies in the samples.
We have also found that the genus curve of galaxies in the HDF is consistent
with the Gaussian random phase distribution with no significant redshift
dependence.Comment: 14 pages, 4 figures, submitted to Ap
Race-Focused Service-Learning Courses: Issues and Recommendations
This article discusses the interaction between race and service-learning in the college classroom. The author found that students of color were more likely to choose the service-learning option in her courses when the incentive was higher and there was more latitude in site choice. The article then looks at factors that adversely affect the service-learning experience in courses that are specifically race-focused and suggests counterbalancing strategies
Just Doing What They Gotta Do: Single Black Custodial Fathers Coping With the Stresses and Reaping the Rewards of Parenting
For single African American custodial fathers, parenting stress is exacerbated by the cultural expectation that Black fathers are normally absent and by the clustering of stresses that Black men are more likely to encounter. This sample of African American fathers have used a repertoire of problem-focused and cognitive coping strategies, including some that are frequently considered culturally specific. Twenty Black single custodial fathers are interviewed and their narratives are analyzed for concepts and thematic categories related to stress and coping. Their narratives indicate that certain strategies are avoided because (a) these strategies are not available to them and (b) they desire to present themselves as independent and competent, thus resisting stereotypes and building a sense of efficacy
Black Single Custodial Fathers: Factors Influencing the Decision to Parent
This pilot study combined narrative and quantitative data to explore the factors enabling and motivating single African American fathers to take full custody of one or more of their children. The size and selection of the sample does not allow for generalization, since most of the men were college-educated and financially stable. The findings indicated a distinction between enabling and motivating factors. Factors that appeared to enable full custody included employment and secure housing, as they were present for all of the fathers before they took custody. Adult age at the time of their first child’s birth was also a factor for 9 of the 10 fathers. Prior parental involvement, previous marital status, and maternal incompetence did not appear to be highly associated with the choice to take custody. However, the narrative data indicated that the desire to embody the kind of father they themselves did not have was a strong motivating factor
War and the Contest Over National Identity
This paper looks at a recent historical moment in which the American national identity was defined and contested in the public arena. The Persian Gulf crisis of 1990-91 presents a case in point in which official actors attempted to define the American character and in doing so prescribed particular actions necessary to fulfill what it means to be an American. President George Bush’s discourse used the crisis to rejuvenate US prestige and American confidence. He described Americans as unique in esteemed values and America as the only country capable of leading the world. In so doing, he invited American participation in support for US military intervention. On the other side, the peace movement chose to emphasize American weaknesses, domestic problems, and the gullible nature of the American people. In so doing, it attempted to shame Americans into supporting the anti-war movement
Mathematics teachers learning with video: the role, for the didactician, of a heightened listening
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