1,721,034 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
Evidences of corrosion inhibition of a food processing brass by Pseudomonas Fluorescens
No full textThis study wants to evaluate the effect of a bacterial strain of Pseudomonas Fluorescens on a brass (CuZn40 Pb 0,20 wt.%) commonly used as pasta extruder in the food industry during storage. The effect of bacteria on the corrosion process was studied from the electro-chemical point of view in conditions mimicking common conservation procedures adopted by third parties. Results evidenced the direct influence of bacteria on the phenomenon by limiting the oxygen availability and influencing the formation and the nature of superficial oxides, which are more protective than those found in absence of bacteria (control and inoculated metabolites)
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
PTFE effect on the electrocatalysis of the oxygen reduction reaction in membraneless microbial fuel cells
No full textInfiuence of PTFE in the external Gas Diffusion Layer (GDL) of open-air cathodes applied tomembranelessmicrobial fuel cells (MFCs) is investigated in thiswork. Electrochemicalmeasurements on cathodeswith different PTFE contents (200%, 100%, 80% and 60%)were carried out to characterize cathodic oxygen reduction reaction, to study the reaction kinetics. It is demonstrated that ORR is not under diffusion-limiting conditions in the tested systems. Based on cyclic voltammetry, an increase of the cathodic electrochemical active area took placewith the decrease of PTFE content. This was not directly related to MFC productivity, but to the cathode wettability and the biocathode development. Low electrodic interface resistances (from 1 to 1.5 Ω at the start, to near 0.1 Ω at day 61) indicated a negligible ohmic drop. A decrease of the Tafel slopes from120 to 80mV during productive periods of MFCs followed the biological activity in the whole MFC system. A high PTFE content in the cathode showed a detrimental effect on the MFC productivity, acting as an inhibitor of ORR electrocatalysis in the triple contact zone. The lowest PTFE content (60%) manifested mechanical instability of the cathode, together with the best performance
Electrochemical study on Bronze biocorrosion: The effect of microstructure
No full textIn this study the behavior of a 12wt% Sn bronze was analyzed in presence and absence of bacteria in a controlled solution containing chlorides, nitrates, sulfates and carbonates in order to simulate stagnant conditions. Biocorrosion processes were studied through potentiodynamic measures (anodic curves) evaluating the effect of the microstructure (as cast or recrystallized). The use of Electrochemical Impedance Spectroscopy (EIS) allowed to obtain a complete overview of the corrosion phenomena, also confirmed by post experiment observations. Considering the behavior of the analyzed system hypotheses have been suggested introducing an electrical equivalent circuit representing the single corrosion processes. The capacitive and resistive phenomena resulted influenced in their values and distributions by the mechanical state of the alloy
La corrosione di leghe Cu-Al utilizzate nel settore alimentare [Corrosion on Cu-Al alloys used in food industry]
No full textIn questo studio è stato valutato il comportamento alla corrosione di una lega di Cu-Al (CuAl10Fe3Ni)
contenente Fe, utilizzata come massello per la trafilatura della pasta. I test sono stati svolti in soluzione di
cloruro di sodio a diverse concentrazioni (0.1M, 0.3M, 0.5M) al fine di valutare il comportamento alla corrosione in condizioni severe di conservazione. Il lavoro ha previsto il monitoraggio del potenziale di libera corrosione e l’utilizzo di curve di polarizzazione anodica e catodica per valutare l’effetto della concentrazione della soluzione sul meccanismo generale. È stata inoltre usata la tecnica di Spettroscopia di Impedenza
Elettrochimica (EIS) per valutare l’influenza dei singoli processi del fenomeno corrosivo globale, nell’ambiente di esposizione. I risultati hanno evidenziato il diverso comportamento del materiale in funzione della molarità della soluzione utilizzata.This study deals with the corrosion behavior of a Cu-Al alloy containing Fe used as a die for pasta extrusion
(CuAl10Fe3Ni). Test was performed in a NaCl solution at different molarities (0.1M, 0.3M, 0.5M) in order to
evaluate corrosion behavior under severe conservation conditions. In this study, open circuit potential (OCP)
was monitored and polarization curves were used in order to evaluate the effect of concentration on the general mechanism. Electrochemical Impedance Spectroscopy (EIS) was also used in order to evaluate the effect of the exposure to environment on the corrosion resistance and the influence of single processes on the global phenomenon. Results evidenced modifications of corrosion behavior according to the type of molarity of the solution
Evidences of corrosion inhibition of a food processing brass by Pseudomonas Fluorescens
No full textThis study wants to evaluate the effect of a bacterial strain of Pseudomonas Fluorescens on a brass (CuZn40 Pb 0,20 wt.%) commonly used as pasta extruder in the food industry during storage. The effect of bacteria on the corrosion process was studied from the electrochemical point of view in conditions mimicking common conservation procedures adopted by third parties. Results evidenced the direct influence of bacteria on the phenomenon by limiting the oxygen availability and influencing the formation and the nature of superficial oxides, which are more protective than those found in absence of bacteria (control and inoculated metabolites)
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