1,720,956 research outputs found
Rapid EDM electrodes manufacturing by metallization of rapid Prototypes.
No full textThe development of Rapid Prototyping techniques opens new perspectives for Rapid
Tooling. The combination of RP and Metal Spraying has been already proofed to be
successful in producing directly moulds for low melting point materials. The attempt to
move this technique to the production of steel dies has generally failed.
A research aimed to the investigation of indirect rapid tooling techniques has been started.
The purpose is to obtain an EDM electrode from a prototype and then using it to
manufacture the steel die by EDM. Rapid Prototyping process considered in the
investigation is Laminated Object Manufacture (LOM).
In first attempt a metallic coating has been applied to the prototype by thermal spraying. In
this case the distortion of the prototype can be minimised and delamination can be
eliminated by a proper choice of growing direction of the LOM prototype combined with a
proper set-up of spraying process including inclination of nozzle, thickness of the layers
and cooling. Considering the geometry of the coated prototype this method led to
unsatisfactory results. The main reasons is the fact that thickness of the coating can not be
controlled and, therefore the resulting geometry of the electrode is different from the initial
geometry.
An alternative technique has been proposed which in principle can produce a sound
electrode combining metal spraying with metal casting. In this approach the LOM object is
a copy of the die instead of the manufactured part. A first layer of metal is applied to the
LOM object by thermal spraying and then is filled by metal casting. A sound electrode is
therefore obtained a used to manufacture the steel die.
In this preliminary work simple geometry electrodes have been considered and tested in
EDM process. Material Removal Rate and wear of electrodes obtained with different
materials and techniques (metal spraying, metal casting) have been evaluated and
compared with those of conventional machined electrodes
A Coordinate Measuring Machine Approach to Evaluate Process Capabilities of Rapid Prototyping Techniques,
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
