1,720,963 research outputs found
Preliminary analysis on cellulose-based gas sensor by means of aerosol jet printing and photonic sintering
No full textIn this paper, we present a preliminary analysis on the possibility to realize low-cost and eco-friendly cellulose-based gas sensors by means of Aerosol Jet Printing (AJP) and flash lamp annealing (FLA). To the authors knowledge, it is the first time that these two techniques are combined in the realization of such a device. The intrinsic hygroscopic properties are the key element of this device: cellulose contains substantial amount of moisture, adsorbed from the environment, enabling the use of wet chemical methods for sensing without manually adding water to the substrate. The sensors were tested in terms of electrical resistance. The penetration of the carbon ink in the cellulose network was stated thanks to cross-sections captured at the microscope. Once placed in a damp environment, all the sensors showed a comparable behavior settling at an asymptotic value of 3.68 MΩ (relative standard deviation of 8%). In presence of different concentration of NH4OH, the sensors showed a resistance proportional to the amount of analyte present in the working volume, showing 25.6% increase compared to the 0.5 M concentration, while 34.1% compared to the 1M
Ionic diffusivity and conductivity of plasticized polymer electrolytes: PMFG-NMR and complex impedance studies
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
Early detection of fish degradation by electronic nose
No full textElectronic nose (EN) can represent a useful tool in agrifood applications, thanks to its capability to identify meaningful parameters based on food-odor.This work is focused on the set up of a measurement protocol to track microbial contamination development in fish under environmental conditions by means of a miniaturized, fast, low-power consumption, EN based on two micro machined metal oxide gas sensors integrated into a USB controlled device. The sensors worked with custom temperature profile protocols and provided real time information
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
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