1,721,406 research outputs found
Powder flowability characterizing techniques
No full textThe experimentally determined indexes for describing the flow of behavior of powder streams in industrial storage, transport, and processing operations are discussed. A better control of powder flow during manufacturing optimizes the quality of the product in terms of uniformity and efficiency. Flowability is important in several industrial processes in the ceramic industry, where flowability of a spray-dried or a granulated powder, in the step of mold filling, affects the green-body homogeneity velocity after compaction. Flowability is also important in dry-powder decoration, a technique that will become much more used in the future, where the reproducibility and the precision of the drawing are strictly dependent on powder flowability.
Bodies, glazes and frits for single-fired tiles
No full textThis paper, which was held on the occasion of the conference at Rakovnicke Keramicke Zavody (Sept. 8, 1993 in Raknovik), deals with the prerequisites for the compositions of bodies as well as glazes, engobes and frits as regards their application in single-firing technology. The tiles produced by means of single-firing have a higher porosity and, in turn, a lower weight per square meter and very good adhesion to the wall when tiling. This results in cost and application advantages for monocottura tiles
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
Fixed airflow limitation caused by COPD or Asthma: from definition to management
No full textPatients with fixed airflow limitation are often classified as chronic obstructive pulmonary disease (COPD), and some international guidelines recommend classifying asthma with fixed airflow limitation as COPD. Indeed, both COPD (induced by smoking or other noxious agents) and asthma may be associated with a decline of lung function that should cause fixed airflow limitation. In the presence of fixed airflow limitation, patients are often diagnosed COPD, even if the differential diagnosis between asthma and COPD in these patients may be important as the natural history as well as the response to treatment are different, depending on whether fixed airflow limitation is due to asthma or COPD. The assessment of patients presenting with fixed airflow limitation has recently hightlighted that airway inflammation is markedly different in asthma and COPD although characterized by the same degree of airflow limitation. Thus, asthma with fixed airflow limitation maintain the same pathological characteristics as asthma with completely reversible airflow limitation. In conclusion, subjects with asthma have distinct characteristics compared with subjects with COPD. Despite the presence of fixed airflow limitation both patients should be properly identified and treated
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
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