1,721,024 research outputs found
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
Transarterial Embolization in Patients with Liver Metastases from Pancreatic Neuroendocrine Neoplasms
No full textSingle center experience of radiological embolisation of liver metastases in patients with pancreatic neuroendocrine neoplasms
No full textDysphagia due to diffuse idiopathic skeletal hyperostosis: an analysis of five cases
No full textWe report five cases of dysphagia caused by diffuse idiopathic skeletal hyperostosis or Forestier's disease of the cervical spine observed by clinical evaluations, X-ray and videofluoroscopy. Dysphagia in particular was present for solid foods in all patients. Three patients showed bolus aspiration into the airways, mainly in the post-swallowing phase and one patient with preserved epiglottic tilt showed post-swallowing penetration. The physiopathogenetic mechanisms affecting swallowing dynamics were mechanical compression of the pharyngeal lumen associated with abnormal epiglottic tilt, incomplete upper esophageal sphincter openings and epiglottic/vallecula stasis. According to our results we can hypothesize that these kinetic alterations may due to Forestier's disease
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
Transarterial Embolization of Liver Metastases in Patients with Pancreatic Neuroendocrine Neoplasms
No full textA-16
Preliminary analysis on a paper-based ammonia sensor for future food smart packaging
No full textHere, we report a preliminary analysis on the manufacturing and testing of a low-cost and eco-friendly paper-based gas sensors realized with Aerosol Jet Printing (AJP) and Flash Lamp Annealing (FLA). The hygroscopic properties of paper make it possible to detect the presence of water-soluble gases in an environment provided with a relative humidity (RH) above a given threshold (RH > 75%). This aspect allows the usage of such technology in the realization of a future food smart packaging detecting the presence of a malevolent gas like ammonia in food. Carbon interdigitated electrodes were printed and sintered on chromatographic paper, obtaining a mean resistance value of to (231m 20)k Ω and (249pm 28)k Ω for the left and the right electrode respectively. The sensors were tested at different relative humidity (RH) values (75, 80, 90, 100%), and once stabilized they were tested with different ammonia concentrations (3, 6, 9 and 12 ppm). A proportional decrease was evidenced in increasing RH and ammonia concentration. Considering the baseline at a constant value of RH =75%, the sensors showed a resistance decrease of 15% in presence of the lowest concentration of 3 ppm
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