1,720,982 research outputs found
Innovative nanomaterials for energy storage: Moving toward nature-inspired systems
No full textThe current needs of finding more efficient materials with tunable properties have served as a motivation for the scientific community to move toward nature-inspired hierarchical materials adhering to the green analytical chemistry principles also because of the high complexity and efficiency of systems in nature. Such type of materials has exhibited highly dynamic interfacial interactions, which are outstandingly valuable for sensing and energy storage applications. Nature-based systems have displayed remarkable features, in terms of energy density, coulombic efficiency behavior, cycling stability energy, durability, and sensitivity. More interestingly, the aforementioned properties could be tuned by modifying the interfacial interactions within the material components. Along this contribution, recent developments on the design of green analytical nature-inspired hierarchical materials will be addressed, especially paying attention to the relationship between interfacial interactions and material features
Recycling electronic waste: Prospects in green catalysts design
No full textA general overview of E-waste valorization toward nanomaterials design is provided. Cutting-edge materials including noble metal-containing samples are described, together with recent advances in E-waste, as sustainable source for catalysts design including electrocatalytic and photocatalytic applications. The present topic is, out of doubt, a very promising option to move into a more sustainable industry, allowing to reduce environmental issues related to E-waste accumulation as well as catalyst production costs
Benign-by-design nature-inspired bionanoconjugates for energy conversion and storage applications
No full textNature encloses a myriad of precise hierarchical organizations of nanoarchitectures /microarchitectures which provide unlimited sources for the design of a wide range of attractive materials. Mimicking complex structures of nature toward the design of hierarchical materials with outstanding properties for sensing and energy storage applications is becoming a revolutionary concept in recent years. The present contribution is aimed to provide an overview of the design of advanced functional bionanomaterials for a wide range of applications, mostly related to energy conversion and storage
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Thermal and light irradiation effects on the electrocatalytic performance of hemoglobin modified Co3O4-g-C3N4 nanomaterials for the oxygen evolution reaction
No full textThe oxygen evolution reaction (OER) plays a key role in the water splitting process and a high energy conversion efficiency is essential for the definitive advance of hydrogen-based technologies. Unfortunately, the green and sustainable development of electrocatalysts for water oxidation is nowadays a real challenge. Herein, a successful mechanochemical method is proposed for the synthesis of a novel hemoglobin (Hb) modified Co3O4/g-C3N4 composite nanomaterial. The controlled incorporation of cobalt entities as well as Hb functionalization, without affecting the g-C3N4 nanoarchitecture, was evaluated using different physicochemical techniques, such as X-ray diffraction, N2-physisorption, scanning electron microscopy, UV-visible spectroscopy and X-ray photoelectron spectroscopy. The beneficial effect of the resulting ternary bioconjugate together with the influence of the temperature and light irradiation was investigated by electrochemical analysis. At 60 °C and under light exposition, this electrocatalyst requires an overpotential of 370 mV to deliver a current density of 10 mA·cm-2, showing a Tafel slope of 66 mV·dec-1 and outstanding long-term stability for 600 OER cycles. This work paves a way for the controlled fabrication of multidimensional and multifunctional bio-electrocatalysts
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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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