5,610 research outputs found

    An investigation of dental luting cements

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    The retentive power of selected dental luting cements has been investigated in-vitro with regard to the effects of taper, temporary cementation and recementation.A standard test method has been developed from measurements of clinically observed tapers and cementation pressures achieved, and account has been taken of the dimensions of human teeth. These observations have indicated a mean clinical taper of 17Ā° to 30Ā° and an initial pressure of 6 kg typically reducing to 3 kg.The order of retention of the various cements has been found to be composites > glass-ionomers/polycarboxylates > zinc phosphate > EBA cement. Prior use of eugeno1-based temporary cements appears to have no adverse effect, except possibly in the case of resin-based composites in conjunction with a volatile cleaning/drying agent.These studies indicate that the effect of taper may be more complex that the literature suggests. In contrast to the accepted view of a monotonic relationship between retention and taper, the current study indicates that for most cements there may in fact be an optimum taper in the range 7Ā° to 15Ā°. The reason for this is unclear.Recementation appears to have no adverse effect on retention. A separate clinical survival study ranked the cements in the order glass-ionomer/polycarboxylate > zinc phosphate > EBA, in full agreement with the in-vitro data

    Child Care on the Cheap: Welfare Reform and the Social Organization of Child Care Work in New York City

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    This study aims to further a feminist political economy of urban welfare regimes, applying a gender lens to processes of urban neoliberalization and an urban lens to feminist political economy analyses of welfare state restructuring and resistance. In New York City, neoliberal welfare reform dramatically increased need and demand for child care, escalating the citys child care crisis. As thousands of poor single mothers were pushed into workfare jobs and the lower reaches of the labour market, the question of Who will care for their children? was thrust to the forefront of New York politics. In response to the crisis, the administration of Mayor Rudolph W. Giuliani channelled welfare mothers into relying on precarious, home-based child care providers for the care of their children, despite federal and state regulations guaranteeing parent choice in the use of child care subsidies. This strategy can be understood as one of privatization, as the city delivered child care services on the cheap by downloading costs of and responsibilities for caregiving onto low-income families/households and communities, and especially the women within them. While occurring against the backdrop of federal welfare reform, the citys response to the crisis is best understood in the context of a broader project of urban neoliberalization designed to roll back the institutional legacies of New Yorks postwar welfare regime, including a public centre-based child care system staffed by a unionized workforce. Yet, paradoxically, the citys strategy to mediate the crisis produced openings for progressive civil society actors to contest the grounds of mediation and push the state to socialize costs of and responsibilities for child care. The most important outcome of this contestation was the unionization of home child care workers and their emergence as a powerful political force in the wake of welfare reform. Overall, this case study demonstrates that under neoliberalism, urban welfare regimes are central sites of contested, state-driven efforts to mediate crisis tendencies in social reproduction. Privatized remedies aimed at mediation can unleash contradictions, creating openings for resistance and a more progressive reorganization of the work of social reproduction

    From civic place to digital space: The design of public libraries in Britain from past to present

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    Inaugurated as, at once, an antidote to the social problems of industrialization and a cultural and ā€œscientificā€ helpmate to progress in an industrial society, public libraries in Britain first appeared in 1850 and soon became a familiar feature, not only on the sociocultural, but also the urban-architectural, landscape. Over the past century and a half, changes in the public library built form have reflected changes in the aims of the public library movement, in architectural style and planning and in wider society. The development and symbolism of the public library built form is analyzed in five periods, stretching from the preā€“First World War phases of civic architecture and large-scale philanthropic eclecticism, through the interwar period of embryonic modernism, to the postā€“Second World War era of full-blown modernism and the subsequent postmodernism of the digital age. In each of these periods, the public library building can be ā€œreadā€ as readily as the books they contained.published or submitted for publicationOpe

    Confluence and contours: reflexive management of environmental risk

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    Government institutions have responsibilities to distribute risk management funds meaningfully and to be accountable for their choices. We took a macro-level sociological approach to understanding the role of government in managing environmental risks, and insights from micro-level psychology to examine individual-level risk-related perceptions and beliefs. Survey data from 2,068 U.K. citizens showed that lay people's funding preferences were associated positively with beliefs about responsibility and trust, yet associations with perception varied depending on risk type. Moreover, there were risk-specific differences in the funding preferences of the lay sample and 29 policymakers. A laboratory-based study of 109 participants examined funding allocation in more detail through iterative presentation of expert information. Quantitative and qualitative data revealed a meso-level framework comprising three types of decisionmakers who varied in their willingness to change funding allocation preferences following expert information: adaptors, responders, and resistors. This research highlights the relevance of integrated theoretical approaches to understanding the policy process, and the benefits of reflexive dialogue to managing environmental risks.Department of Environment Food and Rural Affairs, EPSRC, NERC, ESR

    21st Century Internships: Engaging Academically And Experientially Prepared First And Second Year College Students

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    In this age of technology and early career planning, high school students are increasingly engaged in academically rigorous internships. However, they often must wait several years before being allowed to participate in college internships. This PowerPoint presentation highlights the secondary internship best practice credentials, challenges the high school to college internship gap, and concludes with ideas to help stakeholders troubleshoot, design, pitch, and implement 200-level credit-bearing internship programs for first and second year college students.https://dune.une.edu/casintern_facpres/1000/thumbnail.jp

    Cloning, purification and characterization of the 6-phospho-3-hexulose isomerase YckF from Bacillus subtilis

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    The enzyme 6-phospho-3-hexulose isomerase (YckF) from Bacillus subtilis has been prepared and crystallized in a form suitable for X-ray crystallographic analysis. Crystals were grown by the hanging-drop method at 291 K using polyethylene glycol 2000 monomethylether as precipitant. They diffract beyond 1.7 A using an in-house Cu Kalpha source and belong to either space group P6(5)22 or P6(1)22, with unit-cell parameters a = b = 72.4, c = 241.2 A, and have two molecules of YckF in the asymmetric unit
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