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281.
Jacinta Bronte‐Tinkew Suzanne Ryan Jennifer Carrano Kristin A. Moore 《Journal of marriage and the family》2007,69(4):977-990
Using data from the Early Childhood Longitudinal Study‐Birth Cohort, 9‐month resident father surveys (N= 6,816), this paper examines the association between male pregnancy intentions, prenatal behaviors, and postbirth father involvement. Findings indicate that prenatal behaviors are associated with five domains of father involvement. Men who did not want the pregnancy are less likely to exhibit paternal warmth following the birth, whereas men who wanted the pregnancy sooner than it occurred are more likely to exhibit nurturing behaviors. The influence of fathers’ pregnancy intentions and prenatal behaviors on postbirth involvement is for the most part not dependent on child gender. Findings suggest that prenatal programs that encourage fathers to actively participate in the pregnancy may be beneficial to later child well‐being. 相似文献
282.
Sheila Ryan Johansson 《Population and development review》2003,29(4):715-743
Books reviewed in this article: Jack M. Hollander , The Real Environmental Crisis: Why Poverty, Not Affluence, Is the Environment's Number One Enemy Glenn Firebaugh , The New Geography of Global Income Inequality Nancy E. Riley and James Mccarthy , Demography in the Age of the Postmodern Catherine Campbell , ‘Letting Them Die’: Why HIV/AIDS Intervention Programmes Fail Konstantinos Kapparis , Abortion in the Ancient World 相似文献
283.
This study investigated the significance of friendship for scientific reasoning. We had two main goals: First, assess whether collaborations between friends fostered greater development of scientific reasoning than collaborations between acquaintances, and second, identify which features of friends' collaborative dialogues mediated their greater problem solving accuracy. Fifth graders collaborated on isolation of variables problems of varying difficulty with either a friend or an acquaintance. The results showed that adolescents paired with friends obtained higher problem solving accuracy than adolescents paired with acquaintances during both the collaborative and the posttest sessions. However, the cognitive advantages of working with a friend were only evident in the most difficult isolation of variables problems. Analyses of friends' and acquaintances' dialogues showed that friends were more likely than acquaintances to evaluate their solutions, justify their proposals spontaneously, elaborate and critique each other's reasoning, and engage in transactive discussions. Evaluating outcomes and participating in transactive conflicts were significantly associated with better problem solving, and consequently these may be the two key mechanisms through which friendship effects developmental changes in scientific reasoning. The results are discussed in terms of the need to understand developmental features of relationships and how these features mediate cognitive development and the need to take a longitudinal approach to the study of the relation between transactive dialogues and the development of scientific reasoning. 相似文献
284.
Scott?Diehl Dieter?van?MelkebeekEmail author Ryan?Williams 《Journal of Combinatorial Optimization》2011,22(3):325-338
We show that for all reals c and d such that c 2 d<4 there exists a positive real e such that tautologies of length n cannot be decided by both a nondeterministic algorithm that runs in time n c , and a nondeterministic algorithm that runs in time n d and space n e . In particular, for every \(d<\sqrt[3]{4}\) there exists a positive e such that tautologies cannot be decided by a nondeterministic algorithm that runs in time n d and space n e . 相似文献
285.
Matthew T. Gallagher Joel W. Snodgrass David R. Ownby Adrianne B. Brand Ryan E. Casey Steven Lev 《Urban Ecosystems》2011,14(3):469-484
Stormwater management ponds have become a common Best Management Practice in urban and suburban landscapes. Stormwater management
ponds are designed to hold runoff from impervious surfaces and allow the settling of sediments and associated pollutants.
Various semi-aquatic and aquatic wildlife species have been documented using stormwater management ponds as habitat, but these
wetland-like systems are not managed to adhere to freshwater habitat pollutant guidelines. To address the potential for pollutant
exposure for wildlife, we used a random sample of 68 stormwater ponds and estimated the proportion of ponds in a third-order
watershed that exceed toxicity guidelines for trace metals and polycyclic aromatic hydrocarbons in sediments and chloride
in surface waters. Ninety-six percent of ponds exceeded consensus-based threshold effect concentrations for at least one trace
metal. Concentrations of at least one of the PAHs measured exceeded the threshold effects concentration in 63% of the ponds.
Nine percent of ponds exceeded chronic toxicity levels of chloride on all sampling dates, and 21% exceeded acute toxicity
concentrations on at least one sampling date. More studies are needed to evaluate toxic effects of pollutants in stormwater
management ponds and the potential for interactive effects of pollutants on wildlife. 相似文献
286.
Louise Ryan 《International migration (Geneva, Switzerland)》2011,49(2):80-103
This paper is based on a qualitative study of recent Polish migrants in London ( Ryan, et al., 2007 ). The paper reveals the roles that different family members played in the migration narratives of these Polish migrants. In order to gain a broader understanding of migration patterns, it is necessary to explore what is meant by “the family” and how this may operate transnationally. By examining spatially dispersed relationships, the paper aims to contribute to an understanding of transnational families. In addition, by highlighting the various ways in which families may be split, reunited, and reshaped through the process of migration, the paper argues for a need to explore the shifting ties between relatives “here” and “there”. The paper explores the dynamism of these relationships over time in the context of specific immigration regimes and the interplay with local attachments. 相似文献
287.
This study examined relationships among drinking intentions, environments, and outcomes in a random sample of 566 undergraduate college students. Telephone interviews were conducted with respondents before and after a single weekend assessing drinking intentions for the coming weekend related to subsequent drinking behaviors. Latent class analyses found evidence for four distinct drinking environments distinguished by private/public setting and presence of few/many intoxicated people. There was evidence that the drinking environment mediated the relationship between drinking intentions and heavy episodic drinking in this young adult sample. Future research might focus on examining person/environment interactions as they relate to heavy episodic drinking. 相似文献
288.
Recent research has demonstrated the devastating impact of female-perpetrated psychological aggression in intimate relationships broadly and dating relationships specifically. With the perpetration of psychological aggression in dating relationships occurring at shockingly high rates, prevention programming for dating violence should target this form of aggression. Toward this end, it is important to understand the antecedent conditions that increase one's risk for perpetrating psychological aggression. This study sought to examine two possible risk factors for perpetrating psychological aggression among female undergraduates (N = 145), namely, emotion regulation and trait anger. Findings showed that difficulties with emotion regulation and trait anger were associated with increased psychological aggression perpetration, and trait anger mediated the link between emotion regulation and psychological aggression. Implications of these findings for prevention programming and future research are discussed. 相似文献
289.
Suzanne Ryan Jennifer Manlove Sandra L. Hofferth 《Population research and policy review》2006,25(1):103-126
Using discrete time event history analyses of data from the Panel Study of Income Dynamics (PSID), we examine the association
between state-level welfare waiver policies implemented before the 1996 welfare reform legislation and the risk of a nonmarital
subsequent birth. Our study makes a unique contribution to the existing literature by using a national-level sample of unmarried
mothers who ever received welfare. This high-risk sample represents the women of most interest to policymakers, as it is the
exact group to whom welfare reform is targeted—welfare mothers at risk of having nonmarital additional births. The state policies
we study include: family cap, earnings disregard, work exemptions, work requirements, and sanctions. We conclude that, although
reducing the number of nonmarital births is a key goal of welfare reform, state-established welfare waiver policies do not
have any influence on women’s childbearing behaviors in this sample, net of women’s individual characteristics and state economic
environments. Even the family cap policy, which was designed for the sole purpose of reducing additional births, has no significant
association with nonmarital subsequent childbearing. Instead, personal characteristics, not public policies, are stronger
determinants of women’s childbearing decisions. Age, race/ethnicity, marital status, number of previous children, education
level, and welfare receipt are significantly associated with nonmarital subsequent births. Overall, this paper contributes
to an expanding body of research that shows minimal effects of welfare waivers on fertility. Our work suggests that more targeted
policies are necessary to be able to influence individual family formation behaviors. 相似文献
290.
Jason D. Coleman Jay A. Irwin Ryan C. Wilson Henry C. Miller 《Journal of homosexuality》2014,61(8):1152-1171
Limited quantitative information exists about the demographics and needs of lesbian, gay, bisexual, and transgender (LGBT) persons in South Carolina, a predominately rural Southern state. Responses to a needs assessment survey (n = 715) were analyzed to understand the diversity and needs of members of the LGBT community in SC. The purpose was to inform future programming and guide the development of a more comprehensive portfolio of services to be offered by a local LGBT community center. Findings suggest that a diverse LGBT community exists in SC and needs include increased programming for community members as well as efforts to provide policy-level support and increased acceptability and understanding of LGBT persons in South Carolina. 相似文献