1,721,495 research outputs found
Procedimento di calcolo della composizione del calcestruzzo per manufatti in c.a. e c.a.p. maturati a vapore
No full text655, Maggio 199
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
Modeling the effects of stress ratio and loading frequency on the fatigue behavior of plain concretes
No full textThis paper discusses applying a two-parameter “residual strength” phenomenological model to plain concrete. The model accounts for the concrete strength's stochastic nature and relates it to fatigue life scatter through the Strength-Life Equal-Rank Assumption (SLERA). Checked on a series of literature data, the model allows recovering the static strength statistical distribution from the fatigue data inherently accounting for the stress ratio and loading rate. It is shown that the model's and the Weibull static strength's parameters represent the fingerprint for a given materials category. Its predictive capabilities indicate that the model's physical prerogatives deserve to be considered in the world of concrete
Myocardial infarction and hyperglycemia
No full textWe read with interest the report of Cao and coworkers1 J.J. Cao, M. Hudson, M. Jankowski, F. Whitehouse and W.D. Weaver, Relation of chronic and acute glycemic control on mortality in acute myocardial infarction with diabetes mellitus, Am J Cardiol 96 (2005), pp. 183–186. Article | PDF (62 K) | View Record in Scopus | Cited By in Scopus (45)1 describing the existence of a relation between elevated admission glucose levels and adverse outcome and mortality in diabetic patients during myocardial infarction (MI). Although it has been described in other patient populations, the question of whether hyperglycemia is a mediator or marker of adverse outcomes remains unclear. Recommendations are being developed for strict glucose management in all hospitalized patients; however, glucose measurement has not been included in MI risk indexes, and current MI guidelines do not suggest specific therapeutic targets for glucose control. This relative lack of guidance concerning the risk management of patients with MI and hyperglycemia may be because many aspects of the relation between glucose levels and mortality in patients with MI have not been adequately defined, nor have the pathogenetic mechanisms responsible for adverse outcomes. This gap in knowledge may limit treatment of elevated glucose levels in hospitalized patients with acute MI and hyperglycemia. However, an active inflammatory infiltrate in the peri-infarct area and in unaffected viable myocardium has been described in patients with recent MI.2 The inflammatory burden in the peri-infarct region is associated with worse short- and mid-term outcomes. This is not surprising because the inflammatory response in this region probably amplified myocardial necrosis. In this context, we have shown that hyperglycemic stress during MI is associated with increased levels of some inflammatory markers, including C-reactive protein and interleukin-18, and enhanced expression of natural killer cells (CD16/CD56) associated with reduced expression of some T cells (CD152) known to limit the immune process in patients presenting with acute MI.3 These results fit with animal studies showing increased levels of proinflammatory cytokines (tumor necrosis factor-α, interleukin-6, interleukin-18) and peroxynitrite (an index of oxidative stress) in the heart tissue of hyperglycemic mice. These correlated strictly with the glucose levels,4 leading to myocardial apoptosis and greater infarct size. Finally, analysis of ventricular biopsy specimens obtained from type 2 diabetic patients presenting with acute coronary syndromes and undergoing coronary bypass surgery have shown reduced expression of some important angiogenic factors, such hypoxia-inducible factor-1α and vascular endothelial growth factor, compared with nondiabetic patients with ischemia.5 The results of these studies suggest that hyperglycemia amplifying oxidative stress and the inflammatory responses to myocardial ischemia, as well as impairing angiogenesis factors, may affect the prognosis of patients presenting with MI
Non conventional evacuation of escape behaviour factors and design parameters in fire buildings evacuation
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