1,720,997 research outputs found
Turning UV Light-Active BiOF into Visible Light-Active BiOF by Forming a Heterojunction with gC3N4 and Its Photoelectrochemical Water Splitting Performance in Reverse Osmosis-Rejected Wastewater
No full textPhotoelectrochemical water splitting
over a photoelectrode is an
auspicious methodology for green hydrogen production. The intriguing
properties of graphitic carbon nitride (g-C3N4) in water splitting were studied via construction of a heterojunction
with bismuth-based (BiOX, X = F, Cl, Br, and I) oxyhalides. The g-C3N4/BiOF heterostructure materials were prepared
by adding preformed g-C3N4 via an ultrasonication
process by applying a frequency of 50 Hz and a power of 100 W for
2 h. The fabricated 6% g-C3N4/BiOF electrode
exhibited a significant photoelectrocatalytic (PEC) activity in alkaline
medium with front and back light illumination. In the case of back
light illumination, 6% g-C3N4/BiOF exhibited
a higher photocurrent density of 48.2 μA/cm2 at 1.23
V versus RHE, which is 5-fold larger than that of bare g-C3N4. The augmented charge separation and migration of the
photoelectrode were confirmed using the transient time-photocurrent
response curve and the open-circuit potential, which is consistent
with photoluminescence spectra. The higher charge carrier transfer
of 6% g-C3N4/BiOF was confirmed by electrochemical
impedance spectroscopy analysis. The heterojunction between g-C3N4 and BiOF was confirmed by FT-IR spectroscopy,
Raman spectroscopy, FESEM, and HRTEM analyses, which facilitates the
applied bias photon-to-current efficiency and significant stability
of the fabricated photoelectrode up to 7500 s. Furthermore, the PEC
water splitting performance of the 6% g-C3N4/BiOF electrode in reverse osmosis-rejected wastewater was explored.
Finally, a possible charge-transfer mechanism of the g-C3N4/BiOF heterojunction during PEC water splitting was
proposed, and this work could initiate the BiOF photocatalyst for
PEC water splitting
TiO2-Au nanocomposite materials modified photoanode with dual sensitizer for solid-state dye-sensitized solar cell
No full text
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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