1,721,095 research outputs found
Synthesis of Ta/TaN Coatings with CFUBMS-HiPIMS Technology and Investigation of Mechanical-Tribological Properties
No full textThe aim of thiswork is to study the mechanical and tribological behavior of Ta/TaN coated52100 tool steel. Ta/TaN thin film have been deposited by CFUBMS-HiPIMS method.In the early 2000s, it started to show itself in R&D studies with thetechnological developments in electronic power designs for HiPIMS technology.Today, HiPIMS has been integrated and successfully used as a hybrid in magneticfield sputtering systems for R&D purposes and industrial scale. HiPIMStechnology provides a stable and uniform discharge plasma formation with highcurrent density, ensuring that the growth of the high-density coating and theadhesion bond at the interface is strong. The development of graded Ta/TaN coating structures to optimize adhesionand wear behavior are crucial in high adhesion and lower wear levels whendepositing very hard brittle coatings. Ta/TaN films have excellent friction andwear properties. For this reason, it is predicted that it will be effective inincreasing efficiency and performance for many industrial applications,especially in biodiesel injectors.</p
Synthesis and characterization of Ta/TaN coatings with CFUBMS-HiPIMS technology
Get PDFThe aim of this work is to study the mechanical and tribological behavior
of Ta/TaN coated 52,100 tool steel. Ta/TaN thin film have been deposited by
CFUBMS-HiPIMS method. In the early 2000s, it started to show itself in R&D
studies with the technological developments in electronic power designs for HiPIMS
technology. Today, HiPIMS has been integrated and successfully used as a hybrid in
magnetic field sputtering systems for R&D purposes and industrial scale. HiPIMS
technology provides a stable and uniform discharge plasma formation with high
current density, ensuring that the growth of the high-density coating and the adhesion
bond at the interface is strong. The development of graded Ta/TaN coating structures
to optimize adhesion and wear behavior are crucial in high adhesion and lower wear
levels when depositing very hard brittle coatings. Ta/TaN films have excellent fric�tion and wear properties. For this reason, it is predicted that it will be effective in
increasing efficiency and performance for many industrial applications, especially
in biodiesel injectors. Studies on the mechanical and tribological characteristics of
the TaN system in comparison to other transition metals, however, are few since it
has a hard protective layer. This work looked into the mechanical and tribological
characteristics of thin Ta/TaN thin films. The maximum hardness (28.069 GPa) was
obtained for the film deposited at 9 sccm N2 amount. The highest critical load value
is achieved as 45 N. The lowest coefficient of friction value (0.419) obtained was
found in the R1 film, where the lowest deposition pressure (0.27) was applied
Study of TaN and TaN-Ta-TaN thin films as diffusion barriers in CeFe 4 Sb 12 skutterudite
No full textInternational audienceThe efficiency of thermoelectric devices depends on phase stability of layers constituting the device. TaN and TaN-Ta-TaN thin films, 900 nm thick, were investigated as diffusion barriers for the CeFe4Sb12 thermoelectric substrate in contact with the Cu electrode. It is shown that Sb diffuses through the TaN layer when the sample is heated above 400 °C. Multilayer TaN-Ta-TaN acts as the diffusion barrier for Sb and is efficient up to 500 °C. When diffusion of Sb occurs above 400 °C for TaN and above 500 °C for TaN-Ta-TaN, the formation of FeSb2 and Cu2Sb precipitates was identified by XRD and TEM/energy dispersive X-ray spectroscopy
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
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