1,721,234 research outputs found
Feasibility of FSJ of thermoplastics and Carbon Fiber reinforced thermosetting laminates
No full textThe feasibility of Friction Stir Joining (FSJ) process applied to join amorphous thermoplastic sheets and CFRP (Carbon Fiber Reinforced Polymers) with thermosetting matrix is investigated, experimentally. A preliminary experimental plan involving the variation the welding speed and tool rotation was conducted. IR thermal analysis is performed along with the analysis of the material flow to determine the influence of the process parameters on the developing processing conditions. Mechanical characterization of the welds was performed to understand the influence of the processing conditions on the weld quality, defects, and strength. Fracture surface analysis and optical microscopy analysis were carried out to investigate the interface between the substrates and the penetration of the carbon fibers within the polycarbonate (PC). The results indicate relatively high mechanical strength of the joints that suggests the possibility to adopt FSJ to produce such hybrid structures
Pollution loads discharged from combined sewer overflows: theoretical approach and long term numerical assessment
No full textThe paper describes a theoretical analysis and a numerical assessment of pollutant loads discharged from Combined Sewer Overflows (CSOs) - with or without stormwater tanks - into the environment. The theoretical approach was based on certain simple assumptions, reasonably valid if the time scale of the problem involved is longh enough (month/ year), in that single-event simulation is not interesting at all. The analysis led to a general solution, for a fixed rainfall regime, of the problem of pollution load evaluation. Two main parameters related to the rainfall regime were found to be significant: the total volume of water discharged from the structure and the effective mixing factor between dry and storm waters. A numerical assessment of these two parameters was then made, on an annual basis, by means of long-term rainfall series recorded in Milan, Italy. Both the "simple" CSO structure and the CSO coupled with stormwater tanks (on-line and off-line) were considered. The resulting graphs make it possible to evaluate the total annual load discharged from CSOs into the environmente and the potential reduction obtained by adding a storage capacity to the overflow. This estimation could be of interest for persistent pollutants (phosphorus, heavy metals) discharged into low-recirculation bodies (lakes estuaries, lagoons, closed seas)
Pollution Load Discharged from Combined Sewer Overflows: Theoretical Approach and Long Term Numerical Assessment
No full text
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
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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