1,721,179 research outputs found
Pain Imaging: A Clinical-Radiological Approach to Pain Diagnosis
No full textThis book addresses all pain imaging aspects related to both the central nervous system and the body (thorax, abdomen and pelvis), thus updating the international literature on the topic. By adopting a clinical-radiological approach and offering a comprehensive differential diagnosis for a number of painful syndromes (many of which can mimic one other), the work aims to support and enhance the diagnostic management of these patients, suggesting the most appropriate diagnostic algorithm. The book is divided into separate sections for each anatomical macro-area, and the chapters cover the respective topics from both clinical and radiological perspectives. Further, the book includes extensive electronic supplementary material. As such, it offers an invaluable tool for radiologists, neuroradiologists and clinicians working in internal medicine, surgery and neurology, and could also be used in residency programs for these groups
Quality control of cast iron: Extreme value statistics applied to CT measurements
Full text linkIn this presentation, we will summarize the main results of a research activity aiming at predicting the size of the defect at the origin of fatigue failure in large spheroidal cast iron presses. The endurance limit of the material is largely influenced by the ineluctable presence of defects related to the casting process, such as voids and degenerated graphite. The aim of this activity was to determine a reliable and robust way to control the material in production and to reject the parts which do not meet the company's quality requirements. Defect measurements have been performed with 2D and 3D techniques (i.e. metallographic analyses and computed tomography) and different maxima sampling strategies have been applied to the data, to determine a reliable and robust distribution of the largest defects. The maximum defect in the component volume was estimated adopting the concepts of statistics of extremes. The goodness of the results has finally been validated considering the largest defect detected in the most stressed component volume
Fitting fatigue data with a bi‐conditional model
No full textThe formulation of a probability-stress-life (P-S-N) curve is a necessary step beyond the basic S-N relation when dealing with reliability. This paper presents a model, relevant to materials that exhibits a fatigue limit, which considers the number of cycles to failure and the occurrence of the failure itself as statistically independent events, described with different distributions and/or different degree of scatter. Combining these two as a parallel system leads to the proposed model. In the case where the S-N relation is a Basquin's law, the formulations of the probability density function, cumulative distribution function, quantiles, parameter and quantile confidence interval are presented in a procedure that allows practically any testing strategy. The result is a flexible model combined with the tools that deliver a wide range of information needed in the design phase. Finally, an extension to include static strength and applicability to fatigue crack growth and defects-based fatigue approach are presented
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
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
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