1,720,979 research outputs found
In the path for creating research-to-business new opportunities on green hydrogen between Italy and Brazil
No full textOn September 22, 2021, 5 experts from Brazil and 5 from Italy discussed the future of research-to-business (R2B) cooperation between Italy and Brazil on green hydrogen (H2) and related technologies. The workshop discussed some priorities of the Brazilian policies and elucidated the strengths and the weaknesses of the biggest economy among the Latin American countries. Because of its territorial and underground resources its social and economic activities, Brazil offers an excellent basin for supporting an H2-based economy. A well-established connection between Brazilian Universities and EU research organisations already exists in up-to-date research activities and frameworks for grants programmes. Nevertheless, Brazil has some difficulties creating new economies through the industri-alisation of research achievements. On the other hand, Italy has a long tradition of creating and exporting technologies because its enterprises are generally prone to creating new business.In this communication, we reported the argued discussions between Brazilian and Italian players on green hydrogen that discussed how to improve the technological inter-action between the two countries. This meeting discussed the entire value chain for green hydrogen, from the production to the end-user, and included distribution and commerci-alisation of green H2 and related technologies.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved
Hybrid Platforms of Silicon Nanowires and Carbon Nanotubes in an Ionic Liquid Bucky Gel
No full textSilicon nanowires (NWs) are appealing building blocks for low-cost novel concept devices with improved performances. In this research paper, we realized a hybrid platform combining an array of vertically oriented Si NWs with different types of bucky gels, obtained from carbon nanotubes (CNT) dispersed into an ionic liquid (IL) matrix. Three types of CNT bucky gels were obtained from imidazolium-based ionic liquids (BMIM-I, BIMI-BF4, and BMIM-Tf2N) and semiconductive CNTs, whose structural and optical responses to the hybrid platforms were analyzed and compared. We investigated the electrical response of the IL-CNT/NW hybrid junctions in dark and under illumination for each platform and its correlation to the ionic liquid characteristics and charge mobility. The reported results confirm the attractiveness of such IL-CNT/NW hybrid platforms as novel light-responsive materials for photovoltaic applications. In particular, our best performing cell reported a short-circuit current density of 5.6 mA/cm2 and an open-circuit voltage of 0.53 V
Insights on the electrochemical performance of indirect internal reforming of biogas into a solid oxide fuel cell
No full textThe use of biogas in solid oxide fuel cells (SOFCs) is a viable approach for generating power from renewables. However, the direct use of dry biogas in SOFCs causes many issues concerning the durability of cells. Currently, the conventional approach consists of the use of an external reformer. Nevertheless, other approaches are possible to reduce the complexity of SOFCs. In this paper, we have investigated an indirect internal dry reforming occurring in the anodic chamber of a SOFC as a viable method to minimise the balance of the plant and simplify the feed management. This approach consisted of coupling a foam coated with NiCo/SDC powder in contact with the anode of a conventional SOFC cell. The electrochemical experiments demonstrated promising performances at 800 °C by feeding dry biogas with a maximum power density above 500 mW cm−2 @ 625 mV. The endurance test revealed a stable behaviour over 500 h. We analysed these results according to the physico-chemical properties of both catalyst and cell. The combined electrochemical and physico-chemical analyses corroborated the occurrence of multistep reactions in the anodic chamber
Alkali activated materials using pumice from the Aeolian Islands (Sicily, Italy) and their potentiality for cultural heritage applications: Preliminary study
Full text linkIn this paper, the potentialities of pumice-based geopolymers have been explored with the aim to evaluate their use as restoration materials. In particular, the behaviour of Aeolian pumice during alkali activation process, either alone or in binary mixtures with metakaolin, has been assessed using sodium hydroxide and sodium silicate activators. Hardened products were characterized by: X-ray diffraction; infrared spectroscopy; thermo gravimetry and electron microscopy. Furthermore, Hg-intrusion porosimetry, water absorption, compressive strength and colorimetric measurements were carried out in order to define the technical features of the produced geopolymers. The results reveal that Aeolian pumice mixed with small quantities (20–30 wt%) of metakaolin is suitable for the formation of lightweight geopolymers which exhibit an accessible porosity up to 30%, water absorption of about 18.0%, and satisfactory 28-day compressive strength up to 12 MPa. These values indicate good breathability and adaptability to the substrates of the proposed formulations. Final products display a homogeneous and compact amorphous matrix, and their colour mimic the original stones, highlighting their potential role in Cultural Heritage preservation
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
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