1,772,676 research outputs found
Asymmetrical rolling of an aluminum alloy 1050
Full text linkDoutoramento em Engenharia MecânicaA investigação centrada na optimização do comportamento mecânico e formabilidade de chapas metálicas tem conhecido desenvolvimentos importantes ao longo dos últimos anos. A tendência de redução de peso dos componentes conformados, principalmente no que se refere à indústria automóvel, deve-se a questões não só de índole económica, mas também ecológica. Neste caso, um dos caminhos consiste em investigar novas ligas dentro dos aços já usados, possibilitando uma redução da espessura das chapas, mantendo ou melhorando a performance dos componentes. O caminho alternativo é o uso de outros materiais. Em alternativa ao aço, as chapas de alumínio apresentam potenciais vantagens em termos de peso e resistência à corrosão, mas a sua baixa formabilidade tem vindo a limitar o leque de aplicações.
A formabildade de chapas metálicas depende de um grande número de factores. O comportamento mecânico do material é apenas um deles. Neste trabalho pretende-se estudar o impacto da utilização de um processo alternativo para a produção de chapas, a laminagem assimétrica.
O processo de laminagem assimétrica pretende impôr tensões de corte ao longo da espessura da chapa, originando o desenvolvimento de componentes de textura específicos, designados componentes de corte, além de promover o refinamento de grão. Tais componentes de textura, não alcançáveis pelos processos tradicionais de fabrico, são apontados como benéficos para a melhoria substancial da formabilidade das chapas de alumínio. A diminuição do tamanho de grão resulta, também, num incremento da resistência mecânica. A principal meta é então a obtenção uma combinação optimizada entre formabilidade e resistência mecânica, não alcançável com os processos tradicionais de laminagem seguida de tratamentos térmicos. Neste trabalho, chapas de alumínio 1050 são sujeitas a laminagem assimétrica e posterior tratamento térmico, com o intuito de estudar o impacto do procedimento no desenvolvimento de texturas cristalográficas conducentes a uma melhoria na formabilidade da chapa, e no refinamento do grão, com vista a optimizar a resposta mecânica. São realizados ensaios experimentais para avaliação do impacto dos diversos parâmetros da laminagem no comportamento mecânico das chapas, e discutidas estratégias de optimização do processo de laminagem assimétrica
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Consumer Interest and Marketing Potential of Information on Fish Labels
Full text linkFood labels are an important source of information to consumers. However, little scientific evidence is available on the type of information consumers seek on product labels and how consumers use food labels. The objective of this study is to assess consumers’ use of mandatory information cues and interest in potential information cues placed on fish labels, packages or shelves in five European countries. A cross-sectional consumer survey was carried out in November-December 2004 in five European countries: Belgium, Denmark, the Netherlands, Poland and Spain and a sample representative for age and region within each country has been obtained. Total sample size is 4,786. The results show a high use of on-label information cues; hence, labels were found as good, and potentially market effective sources of information. Consumers were most familiar with expiry date, price, species name and weight and they felt able to derive clear quality expectations from the information these cues convey. Consumers displayed the strongest interest in an additional information cues, such as safety guarantee and a quality mark for seafood. Cross-country differences in both use and interest in fish information cues were observed.consumer, fish, label, Consumer/Household Economics, Marketing,
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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