1,720,971 research outputs found
Optimization of Piezo-Driven Jet Valve Dispensing Process for the Geometrical Control of Printed Sensors Based on Silver and MXene Inks
No full textPrinted sensors offer unique benefits - highly customizable designs, low-cost prototyping, and a wide range of materials and properties - which can be exploited. Piezo-driven jet valve dispensing is a printing technique suitable for the fabrication of sensors and electronics directly on the surfaces (both 2-D and 3-D) of smart objects and devices but needs additional analysis and study. In this work, we studied the influence of printing parameters on the performance of the Nordson PICO Jetting system mounted on the Neotech PJ15X machine by depositing a silver ink, typically used for the fabrication of sensors and interconnections, and a Ti3C2TX ink, a very promising 2-D material in the sensing and electronics fields for its extraordinary physical, electrical, chemical, and mechanical properties. A tuning approach was proposed to tune the printing parameters correctly. The profiles of the cross sections of printed lines were evaluated, including the process variability, when the values of the printing parameters were changed. In the case of Ti3C2TX, the improper setting of the printing setup caused undesired spots and irregular lines. The optimal settings for the printing setup were found for each ink, reaching a variability in the profile of 1.5%
Temperature influence on Ti3C2Tx lines printed by aerosol jet printing
No full textAerosol jet printing (AJP) is a promising printing technology for fabricating sensors and electronics, due to its high flexibility in ink and substrate selection. Indeed, inks suitable for AJP can differ in morphology (2D and 3D nanoparticle, nanoflake, nanosheet, etc.), in electrical properties (conductive, semiconductive, insulating, etc.), or in additional advanced features (biocompatibility, stretchability, etc.). Inks can be deposited on planar, or complex 3D surfaces, which can be made of a variety of materials. Ti3C2Tx, a MXene, is a prominent 2D material, and is considered a promising material for energy storage electrodes and sensing elements due to its good stability and electrical conductivity. In this work, we propose a fabrication process based on AJP to print Ti3C2TX ink on PET-based sheets and we analyze the morphology (width and thickness) and the resistance by changing the number of overlaid printed layers (Nlayers) and the pattern. The results from the morphological analysis and resistance measurements indicate uniform deposition and good repeatability using AJP, regardless of Nlayers and the geometry of the printed pattern (thin lines, serpentine, long lines). Finally, for the first time, we estimate the temperature effects on the resistance of pure Ti3C2TX printed lines. For example, in the range − 10–60 °C and in the range 20–120 °C the resistance of Ti3C2TX printed on PET-based sheet increases by 13% and 20%, respectively. We also deposit different types of conformal coating to protect the printed layers from oxidation
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
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