1,721,142 research outputs found
Interazioni sinuose. Progettazione di manufatti tipo per la conservazione e la fruizione di un'area di cava dismessa di valenza storica ubicata ad alta quota nel Parco Regionale delle Alpi Apuane.
No full textSi studiano le potenzialità di valorizzazione delle risorse ambientali di un sito di cava.
Tracce di cave antiche, soleggiamento, vento, terreno, materiali abbandonati nei ravaneti possono generare le caratteristiche dell'architettura anche ai fini della sostenibilità
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
Sugar-based iron-doped N-carbons for oxygen reduction reaction
No full textFuel cells for low temperature applications are the subject of intensive research because they could reduce consumption of primary fossil fuels and greenhouse gas emissions. However, performances of these devices are severely limited by the kinetics of the oxygen reduction reaction (ORR) at the cathode, so that the use of high-cost catalysts, such as Pt, is so far mandatory. Although catalytically optimal, Pt catalysts suffer drawbacks such as formation of poisoning surface Pt-oxides and particle coarsening (by dissolution/re-precipitation, Ostwald ripening), that cause loss of both active surface area and activity. Other negative aspects have economic origin due to the metal natural scarcity and cost. A very interesting research challenge is to find an alternative non-precious, though less catalytically performing, catalyst. Among others, nitrogen-modified carbons doped with non-precious transition metal centres, typically iron, are of interest because of reduced costs of precursors and easiness by which composition and morphology can be modulated by preparation.
In this work we present some results on oxygen reduction reaction by a series of Pt-free catalysts obtained by pyrolysis of guanidine-based nitrogen compounds/sugar mixtures in the presence of a metal salt and a templating agent.
Catalysts were characterized by physical, chemical and electrochemical methods. Results are presented in terms of the influence that precursors nature exerts on oxygen reduction onset potential, presence of defined limiting current and reaction mechanism. They are characterized by a well-defined limiting current, an onset potential approaching Pt ORR starting potential and a number of exchanged electrons n>3.9. An attempt of explanation of different electrocatalytic behavior obtained varying the nature of precursor is also done
Electrochemical characterisatio n of electrodes modified with a Co/Al hydrotalcite-like compound
No full texttechniques and electrochemical impedance spectroscopy in aqueous solution. The latter technique was used in order to study the electronic
and ionic transport, both inside and on the surface of the material. The behaviour of the modified electrode was studied at different OH−
concentrations (pH 11–12.8) and at different temperatures, with the aim to calculate the activation energies of the electronic conduction and
charge-transfer processes.
The electronic conductivity of the bulk material is dependent on the CoIII/CoII ratio and results the limiting parameter of the overall redox
process. The same result was previously obtained for the Ni based hydrotalcite, but the latter material showed a better electrical conductivity
An AC Impedance Spectroscopy Study of Mg-doped LiCoO2 at Different temperatures: Electronic and Ionic Transport Properties
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