33 research outputs found
Work Hardening and Recovery During Primary Creep of TiN Dispersion Hardened 20% Cr-25% Ni Stainless Steel
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Creep rupture properties of oxidised 20%Cr austenitic stainless steels
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Primary creep of Zircaloy 4 in the temperature range 923-1073K
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Purifying Selection in Deeply Conserved Human Enhancers Is More Consistent than in Coding Sequences
No full text(c) 2014 De Silva et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Influência da variação da nodularidade na usinabilidade do ferro fundido vermicular
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2007.Atualmente, fatores como: a redução das emissões de poluentes, redução do consumo de combustíveis dos veículos sem alterar a potência, são decisivos para corporações do ramo automobilístico ganhar o mercado consumidor. Neste contexto, o ferro fundido vermicular tem se apresentado como um material de uso potencial, em diversos componentes, bem como em motores diesel devido às suas propriedades superiores. Apesar das boas características mecânicas e dos seus vários benefícios para a indústria, sua microestrutura é de difícil usinabilidade o que se torna um fator limitante de sua aplicação. Um desses fatores é o limite de nodularidade que deve estar em uma faixa de 0 a 20%, pois quanto maior seu aumento, maior será a resistência a tração e a rigidez, diminuindo a condutividade térmica e usinabilidade do material. Ademais, comparado ao ferro fundido cinzento, a dificuldade na usinagem do vermicular está relacionada também a dois fatores: a sua alta resistência mecânica que acarreta grandes forças de corte, e a ausência de sulfeto de manganês em sua microestrutura, sempre presente no ferro fundido cinzento, e que deposita-se sobre a ferramenta de corte garantindo uma ação lubrificante local. Desse modo o presente trabalho tem como objetivo analisar a influência que a variação na nodularidade do ferro fundido vermicular tem sobre a sua usinabilidade. Os critérios utilizados para a análise foram os tempos de vida e os mecanismos de desgaste das ferramentas de metal-duro e de cerâmica na usinagem do ferro fundido vermicular em processo de corte contínuo. Os resultados obtidos mostram que a variação da microestrutura tem grande influência na usinabilidade do material e que as ferramentas de metal-duro se mostram as mais viáveis para a usinagem do ferro fundido vermicular em função dos bons resultados apresentados.Nowadays, factors such as: the pollutants emission reductions, the fuel consumption reduction on vehicles without loosing power, are decisive to the automobile corporations to win the consumer market. Within this context, the compact graphite iron has showed itself as a material with a lot of potential to many components, as well as diesel engines due its superior properties. Despite its good mechanical characteristics and the many benefits that it can bring to the industry, its structure and the composition have a very hard machinability what become limiting factors to its application. One of these factors is the nodularity that should be between 0-20 percent, because how much increase the nodularity, bigger will be the stiffness and tensile strength, decreasing the machinability and thermal conductivity of the CGI. Furthermore comparing to the gray cast iron, the difficulty on machining the compact graphite iron is related on two factors: its high mechanical resistance which involves great cutting powers and the absence of manganese sulfide on its microstructure, which is always present on the gray cast iron that deposits on the cutting tool and guarantees a lubricant action locally. The present work has as purpose to analyze the influence of the nodularity variation on the machinability of compact graphite iron. The parameters consider for the analyses were the tool life and the wear mechanisms of the carbide and ceramics cutting tools. The results showed that the microstructure variation has great influence on the CGI machinability and that the carbides showed the most viable cutting tool for machining the compact graphite iron
Health Inequality and Its Determinants in New York
No full textSelf-assessed health status conditioned by several objective measures of health and socio-demographic characteristics are used to measure health inequality. We compare the quality of health and health inequality among different racial/ethnic groups as well as across 10 economic development regions in New York State. In terms of average health and health inequality, American Indian/Alaskan Natives and Hispanics are found to be the worst, and North Country and Southern Tier regions lag behind the rest of the State. Three major contributing factors to health inequality are found to be employment status, education, and income. However, the contribution of each of these determinants varies significantly among racial/ethnic groups as well as across regions, suggesting targeted public health initiatives for vulnerable populations to eliminate overall health disparity.
Author Correction: CHD3 helicase domain mutations cause a neurodevelopmental syndrome with macrocephaly and impaired speech and language (Nature Communications, (2018), 9, 1, (4619), 10.1038/s41467-018-06014-6)
No full text\ua9 2019, The Author(s).The HTML and PDF versions of this Article were updated after publication to remove images of one individual from Figure 1
Area-based Initiatives: The rationale and options for area targeting
No full textThis paper explores the rationale for area targeting and the growth of new area-based initiatives. The author examines the geographical concentration of deprivation, the extent, and whether there is a polarisation between areas. The evidence confirms that there is a clear rationale for area-based approaches, although it should not be assumed that they will be the most effective means to improve conditions in all cases. The evidence suggests that there should be a closer link between area-based approaches and national level main programmes, given the time-limited nature of the former and the fact that they only reach a minority of all deprived people. The issues involved in identifying the target areas are also reviewed including the question of who decides and on what basis. It is concluded that understanding the spatial distribution of deprivation is crucial and that there is an urgent need for better, more up-to-date statistical and other data relating to small geographical areas.Area targeting, deprivation, polarisation, area-based initiatives
Health Inequality and Its Determinants in New York
No full textSelf-assessed health status conditioned by several objective measures of health and socio-demographic characteristics are used to measure health inequality. We compare the quality of health and health inequality among different racial/ethnic groups as well as across 17 regions in New York State. In terms of average health and health inequality, American Indian/Alaskan Natives and Hispanics are found to be the worst, and North Country, Bronx County, and Richmond County lag behind the rest of the State. Three major contributing factors to health inequality are found to be employment status, education, and income. However, the contribution of each of these determinants varies significantly among racial/ethnic groups as well as across regions, suggesting targeted public health initiatives for vulnerable populations to eliminate overall health disparity.
