1,720,966 research outputs found
Analysis, Design and Realization of a Furnace for In Situ Wettability Experiments at High Temperatures under X-ray Microtomography
Full text linkIn this study, we analyzed the problem of a compact furnace, to be used for in situ
experiments in a cone-beam X-ray microtomography commercial system. The design process was
accomplished and outlined through its main steps, until the realization of a prototype. The furnace
was conceived to carry out wettability experiments at temperatures up to 700 C and under inert
atmosphere on sessile droplets of a molten metal alloy, with a few millimeters diameter, posed on a
thin ceramic substrate. X-ray imaging of the molten droplet is expected to permit an accurate threedimensional
reconstruction of the droplet profile and a robust estimation of the related quantities
(such as the contact angle and the surface tension) utilized for the assessment of metal-ceramic
joints by brazing. The challenges faced during this project, mostly related to the constraints of the
setup, and the novel solutions implemented were discussed also with the support of analytical and
numerical tools, in terms of interaction of X-rays with matter, geometry and working principle, heat
transfer and insulation, material selection
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
Design of glass containers for submarine carbon storage
Full text linkThis work deals with the preliminary design of glass containers to be deposited on the seabed at 2000 m depth after being filled with liquefied carbon dioxide (CO2) at a pressure of 10 MPa. The specific purpose is to provide preliminary structural analyses of the containers to be employed in a novel patent CO2 storage method called confined submarine carbon storage (CSCS). The core steps of the CSCS technology are the container manufacturing and filling with high-pressure liquid CO2. Consequently, the container geometry, material properties and structural response are the most critical aspects in the container design. Due to the low cost and to the high stability in salty environment, glass has been identified as a suitable material for the CSCS technology. Furthermore, the high compressive resistance allows glass containers to be deposited on the seabed where the external water pressure exceeds the internal pressure of liquefied carbon dioxide. On the other hand, the limited tensile resistance of glass requires a careful shape design. The glass containers have to be designed to withstand stresses generated during their entire working life. This includes CO2 filling, the launching, the impact with the seabed and the final piling up and stacking of a huge number of containers. Finite element analyses have been performed in order to define the container shape, conjugating an acceptable storage capacity with a safe mechanical response during both the filling and deposition phases
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
- …
