1,720,986 research outputs found
La poesia in Italia. Scenari di fine, e d'inizio, millennio
No full textIl capitolo propone un attraversamento della poesia italiana contemporanea attraverso le figure di quattro poeti: Milo De Angelis, Gabriele Frasca, Antonella Anedda, Valerio Magrell
Recycling of eggshell waste into low-cost adsorbent for Ni removal from wastewater
No full textThe disposal of about 8 million ton/year of eggshell waste produced worldwide is an environmentally challenging issue. However, this waste can be converted to new materials useful for several industrial applications. In this study, hydroxyapatite was synthesized from eggshell waste and used as adsorbent for Ni2+ removal from aqueous solutions. Eggshell-derived hydroxyapatite was characterized using X-ray diffraction, scanning electron microscopy with the energy dispersion spectrum analysis and Fourier transform infrared spectroscopy. Batch experiments were conducted to investigate the effects of contact time and initial Ni2+ concentration on the adsorption process. Adsorption equilibrium was achieved within 80 min. The kinetics of the adsorption process was studied applying pseudo-first-order, pseudosecond-order and intraparticle diffusion kinetics models. The kinetics study showed that the pseudosecond-order kinetic model described well the adsorption process with high correlation coefficient. The maximum Ni2+ adsorption capacity was found to be 109 mg g-1 which is generally higher than other waste-derived adsorbents. The adsorption of Ni2+ on eggshell-derived hydroxyapatite was well fitted by the Langmuir equation as compared to Freundlich, Temkin and Dubinin-Radushkevic isotherm models. The removal mechanism of Ni2+ by eggshell-derived hydroxyapatite could involve ion exchange with Ca2+ and dissolution/precipitation of the starting hydroxyapatite resulting in the formation of a Ni-bearing phosphate. The results of the present study showed that hydroxyapatite synthesized from eggshell waste represents an excellent low-cost adsorbent for treatment of Ni2+ contaminated waters
Negligible power consumption add/drop switching properties of graphene on SOI microring resonators
No full textWe investigate the switching reconfiguration properties of graphene on SOI add/drop microring resonators. Graphene can effectively enable/disable the add/drop functionality with negligible power consumption with respect to the typical approach based on thermal tuning
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
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