1,721,004 research outputs found
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
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
Controlled p-Type Doping of MoS2 Monolayer by Copper Chloride
No full textElectronic devices based on two-dimensional (2D) MoS2 show great promise as future building blocks in electronic circuits due to their outstanding electrical, optical, and mechanical properties. Despite the high importance of doping of these 2D materials for designing field-effect transistors (FETs) and logic circuits, a simple and controllable doping methodology still needs to be developed in order to tailor their device properties. Here, we found a simple and effective chemical doping strategy for MoS2 monolayers using CuCl2 solution. The CuCl2 solution was simply spin-coated on MoS2 with different concentrations under ambient conditions for effectively p-doping the MoS2 monolayers. This was systematically analyzed using various spectroscopic measurements using Raman, photoluminescence, and X-ray photoelectron and electrical measurements by observing the change in transfer and output characteristics of MoS2 FETs before and after CuCl2 doping, showing effective p-type doping behaviors as observed through the shift of threshold voltages (Vth) and reducing the ON and OFF current level. Our results open the possibility of providing effective and simple doping strategies for 2D materials and other nanomaterials without causing any detrimental damage
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
Semiconducting two-dimensional nanomaterials for optoelectronic devices
Get PDFThe emergence of transition metal dichalcogenides (TMDCs) monolayers which exhibit a variety of structural and electronic configurations has attracted significant attention as the monolayers have been found to possess unique characteristics that are not observed in their bulk forms. These materials have sufficiently wide electronic bandgaps (Eg = 1~2 eV) with a direct band gap nature, which makes them suitable for electronic and optoelectronic applications. Their atomically-thin configuration coupled with the presence of covalent bonds between the transition metal atoms and the chalcogenide atoms ensure that the materials are highly flexible and transparent. As a result, TMDC monolayers have potential in applications such as flexible and transparent optoelectronic devices.
In this thesis, TMDC monolayers are studied ranging from the synthesis of these materials to their implementation in optoelectronic device applications. The aim of this research is to enhance our understanding of the electronic and optoelectronic behaviour of these layers and to demonstrate the feasibility of using TMDC monolayers in next-generation device applications. The initial goal is to synthesise large-sized single crystals using chemical vapour deposition, where the nucleation density can be controlled through solution-processing and the loading of an extremely small amount (0.01 mg) of transition metal oxide precursors. It is shown that the nucleation density can be dramatically decreased so that large grain sizes up to 500 μm can be obtained in the TMDC monolayer film. Using this approach, the synthesis of MoS2/WS2 heterostructures is shown to be possible using a one-step process, which results in a clean interface without much mixing of the precursors.
Following a discussion of the synthesis process, my DPhil thesis then focuses on chemical doping of the surface of the monolayers and the role of strain engineering on the tuning of the physical, optical, and electrical properties of the TMDC monolayers. It was found that the carrier density of an MoS2 monolayer could be modulated and that properties such as the photoresponsivity, detectivity, and photoresponse time can be controlled through changes to the energy band structure. Also, strain engineering of TMDC monolayers and hetero-bilayers is successfully demonstrated. The excitonic behaviour of an MoS2/WS2 hetero-bilayer, when subjected to a small mechanical strain (up to 0.7 %), is experimentally observed for the first time, and the effect of interlayer coupling on the wavelength of the photoluminescence peak as well as changes in the photoluminescence intensity are demonstrated.
Lastly, the thesis considers specific optoelectronic applications of TMDC monolayers. These optoelectronics applications include: a (1) 2D/QD vertical heterojunction phototransistor with an enhanced photoresponse time of 950 μs and photoresponsivity of 6120 A/W and a (2) two-terminal MoS2 flexible photodetector with surface functionalisation that decreases the response time to 0.7 s. The results and performance of the materials and devices presented in this thesis show particular promise for next-generation, flexible and transparent device applications.</p
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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