1,720,958 research outputs found
Optimization of additive manufacturing processes for copper and its alloys
Get PDFL'abstract è presente nell'allegato / the abstract is in the attachmen
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Investigation on LPBF Processability of an In-situ A6061 Matrix Composite
No full textThe interest in laser powder bed fusion (L-PBF) has grown in the last decades because of the possibility to obtain near-net shapes parts with high performance. However, the main issue in this process is the limited availability of materials. For instance, A6061 alloy has a wide application range but it is hardly processable by L-PBF because of a severe solidification cracking. This critical issue can be overcome through the introduction of nucleants in the system, which induce an equiaxed solidification and avoid the solidification cracks. A6061 RAM2 is a mixture of A6061, Ti and B4C particles capable to react with each other to synthetise TiC and TiB2, grain refiners for Al alloys. A parameters optimization to produce dense samples was performed. Microstructural characterization of these specimens was carried out to investigate the evolution of the system in the processed material. Then, preliminary evaluation of mechanical properties was performed
Improving the Laser Powder Bed Fusion Processability of A2618 alloy: Investigation on TiB2 Addition Strategies via Single Scan Track Approach
Get PDFProcessing aluminum alloys by Laser Powder Bed Fusion (L-PBF) is of great interest for components production in various industries; however, their processability is
quite challenging due to their susceptibility to solidification cracking. One effective strategy to overcome this problem is the addition of inoculants to modify their
solidification mechanism and to prevent crack initiation. In this context, this study focuses on the processability of the A2618 alloy with the addition of TiB2 as an
inoculant using different ex situ strategies: low- and high-energy mechanical mixing and plasma coating respectively. The Single Scan Tracks (SSTs) approach was
used to investigate the quality and stability of tracks that greatly influence the quality of printed parts and optimize the process parameters for the three feedstocks.
The comparison between the systems enabled the identification of slight differences between powders in terms of the processability window, revealing the influence
of the inoculant dispersion method on the processability of the A2618 alloy. Electron Backscatter Diffraction (EBSD) analysis carried out on the SST cross-sections
confirmed significant differences between the three powders in terms of grain refinement. In addition to the microstructure refinement and the absence of solidification cracks, the analysis revealed the effectiveness of the plasma coating method which allows for obtaining a uniform and homogeneous distribution of the
reinforcement on the aluminum particles’ surface. Bulk samples were then produced to validate the optimization study results: the characterization of the cubic
samples revealed a dense (99.9%) and crack-free microstructure, with a homogeneous distribution of the reinforcement phase
- …
