1,720,959 research outputs found
An investigation on the role of indium in LaBaInO4, through synthesis and characterization of LaBaGaO4 and LaBaInxGa1-xO4
No full textLAUREA MAGISTRALELe perovskiti a comportamento semiconduttore rappresentano materiali di grande inter
esse per applicazioni fotocatalitiche nel campo dell’energia sostenibile e del trattamento
delle acque. In questo lavoro è stato studiato il ruolo dell’indio nella perovskite di tipo
Ruddlesden–Popper LaBaInO4, attraverso la sua sostituzione parziale e completa con gal
lio, ottenendo LaBaGaO4 e nove composizioni intermedie Ga/In. Le proprietà strutturali,
morfologiche e ottiche sono state analizzate mediante diffrazione a raggi X, microscopia
elettronica a scansione e spettroscopia di riflettanza diffusa UV–Vis. L’attività fotocata
litica è stata valutata in termini di evoluzione dell’idrogeno da scissione dell’acqua e di
degradazione della Rodamina B. Per incrementarne le prestazioni, è stata inoltre appli
cata una fluorurazione topochimica a LaBaGaO4 e ai composti Ga/In, con l’obiettivo di
modulare il band gap in differenti fasi cristalline. I risultati evidenziano come la sosti
tuzione cationica e la fluorurazione influenzino in modo significativo le proprietà strut
turali, ottiche e fotocatalitiche, fornendo utili indicazioni per la progettazione di nuovi
fotocatalizzatori a base di perovskiti per applicazioni energetiche e ambientali.Perovskites with semiconducting properties are promising materials for photocatalytic
applications in sustainable energy and water treatment; the aforementioned materials
are attractive because their octahedral framework is both robust and compositionally
f
lexible, allowing precise, structure-level tuning while maintaining stability in aqueous
environments. This work examines the role of indium in the Ruddlesden–Popper type
perovskite LaBaInO4 through partial and complete substitution of gallium with indium
in LaBaGaO4. Phase purity, crystal structure, morphology, and optical properties were
characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and
UV–Vis diffuse reflectance spectroscopy (DRS), respectively. Photocatalytic activity was
evaluated for hydrogen evolution and Rhodamine B degradation. to understand the role
of mixed-anion and role of fluoride to oxide substitution, topochemical fluorination was
applied to LaBaGaO4 and Ga/In-substituted compounds to investigate band gap tuning
in both flexible and rigid formed phases. Results reveal the influence of cation substitution
and fluorination on structural, optical, and photocatalytic properties, providing insights
into the design of advanced perovskite photocatalysts for energy and environmental ap
plications
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
Impact of Parenting Style on Academic Achievement Motivation among College Student of Ranchi District
No full textThe present study aimed at exploring the impact of parenting style on academic achievement motivation among college students of Ranchi District. The main objective of this research was to study the impact of parenting style (restrictive and permissive parenting style) on academic achievement motivation. 200 samples were selected for this study, by random sampling technique. Three dimensional parental behaviors (TDPBI) of Ojha, H. & Academic achievement motivation test (AAMT) of Sharma, T.R. used as tools for data collection. 2x2 factorial design was used for the study in which there were 4 strata. Each stratum consisted of 50 cases. Result showed that student who received restrictive parenting style had high academic achievement motivation whereas student who received permissive parenting Style had low academic achievement motivation. On the other hand, Hindu college student’s reported high academic achievement motivation whereas Muslim college student reported low academic achievement motivation. As conclusion we can say that students who received high restrictive parenting style had higher academic achievement motivation than students who received permissive parenting style
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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