1,720,957 research outputs found
Cubic crystalline erbium oxide growth on GaN(0001) by atomic layer deposition
No full textFull text access from Treasures at UT Dallas is restricted to current UTD affiliates until 2019-01Growth of crystalline Er₂O₃, a rare earth sesquioxide, on GaN(0001) is described. Ex situ HCl and NH₄OH solutions and an in situ N₂ plasma are used to remove impurities on the GaN surface and result in a Ga/N stoichiometry of 1.02. Using atomic layer deposition with erbium tris(isopropylcyclopentadienyl) [Er((^{i}PrCp)₃] and water, crystalline cubic Er₂O₃ (C-Er₂O₃) is grown on GaN at 250 ⁰C. The orientation relationships between the C-Er₂O₃ film and the GaN substrate are C-Er₂O₃(222)GaN(0001), C-Er₂O₃ (-440)GaN (11-20), and C-Er₂O₃GaN (1-100). Scanning transmission electron microscopy and electron energy loss spectroscopy are used to examine the microstructure of C-Er₂O₃ and its interface with GaN. With post-deposition annealing at 600 ⁰C, a thicker interfacial layer is observed, and two transition layers, crystalline GaN_wO_z and crystalline GaEr_xO_y, are found between GaN and C-Er₂O₃. The tensile strain in the C-Er₂O₃ film is studied with x-ray diffraction by changes in both out-of-plane and in-plane d-spacing. Fully relaxed C-Er₂O₃ films on GaN are obtained when the film thickness is around 13 nm. Additionally, a valence band offset of 0.7 eV and a conduction band offset of 1.2 eV are obtained using x-ray photoelectron spectroscopy.National Science Foundation (Award No. DMR-1507970)Erik Jonsson School of Engineering and Computer Scienc
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
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
Atomic-scale Characterization of Surface and Interface Dynamics in Novel Materials: Cr2Ge2Te6, NbSe2, and Strontium Barium Niobate
No full textTransition metal dichalcogenides (TMDs) and transition metal trichalcogenides (TMT) are
promising layered materials for novel electronic and optoelectronic device applications due to their
fascinating electronic, optical, magnetic, and chemical properties with two dimensional (2D)
atomic limits. However, their thermal stability and thermally induced defects, which are crucial
for reliable operation of the devices, remain an area for further investigations.
The electro-optic (EO) materials with high Pockels coefficient are also an intriguing research field
for fast, small, and low power consumption electro-optical devices. Integrating the EO materials
on the current silicon technologies is challenging due to demands for high crystal quality and
sensitivity to orientation but highly desirable to expand their application field with compact design
and low power consumption.
This dissertation focuses on the thermal stability and thermal evolution studies of 2(TMD)
and 226 (TMT) at the surface and material interface by employing in-situ scanning
transmission electron microscopy (STEM) to probe the dynamics of thermal evolution and defects.
The interface and surface of molecular beam epitaxial (MBE) grown strontium barium niobate on
silicon with strontium titanate buffer layer is also investigated using STEM to understand the
nature and growth mechanism
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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