1,721,207 research outputs found
sj-pdf-1-wso-10.1177_17474930231207512 – Supplemental material for Duration of dual-antiplatelet therapy after stent-assisted coil for unruptured intracranial aneurysm: A nationwide cohort study
No full textSupplemental material, sj-pdf-1-wso-10.1177_17474930231207512 for Duration of dual-antiplatelet therapy after stent-assisted coil for unruptured intracranial aneurysm: A nationwide cohort study by Minyoul Baik, Jimin Jeon, Seok-jae Heo, Joonsang Yoo and Jinkwon Kim in International Journal of Stroke</p
WSO884517 Supplemental Material - Supplemental material for Characteristics and management of stroke in Korea: 2014–2018 data from Korean Stroke Registry
No full textSupplemental material, WSO884517 Supplemental Material for Characteristics and management of stroke in Korea: 2014–2018 data from Korean Stroke Registry by Han-Yeong Jeong, Keun-Hwa Jung, Heejung Mo, Chan-Hyuk Lee, Tae Jung Kim, Jong-Moo Park, MiSun Oh, Ji Sung Lee, Beom Joon Kim, Joon-Tae Kim, Jinkwon Kim, Woo-Keun Seo, Jun Lee, Jae-Kwan Cha, Sang-Bae Ko, Hee-Joon Bae and Byung-Woo Yoon in International Journal of Stroke</p
Stabilizing hidden room-temperature ferroelectricity via a metastable atomic distortion pattern
No full text© 2020, The Author(s). Nonequilibrium atomic structures can host exotic and technologically relevant properties in otherwise conventional materials. Oxygen octahedral rotation forms a fundamental atomic distortion in perovskite oxides, but only a few patterns are predominantly present at equilibrium. This has restricted the range of possible properties and functions of perovskite oxides, necessitating the utilization of nonequilibrium patterns of octahedral rotation. Here, we report that a designed metastable pattern of octahedral rotation leads to robust room-temperature ferroelectricity in CaTiO3, which is otherwise nonpolar down to 0 K. Guided by density-functional theory, we selectively stabilize the metastable pattern, distinct from the equilibrium pattern and cooperative with ferroelectricity, in heteroepitaxial films of CaTiO3. Atomic-scale imaging combined with deep neural network analysis confirms a close correlation between the metastable pattern and ferroelectricity. This work reveals a hidden but functional pattern of oxygen octahedral rotation and opens avenues for designing multifunctional materials11sciescopu
Growth and Electronic Structure of Copper Oxide Monolayer Epitaxial Films
No full textCopper-basedhigh-temperature superconductors share acommon featurein their crystal structure, which is the presence of a CuO2 plane, where superconductivity takes place. Therefore, importantquestions arise as to whether superconductivity can exist in a singlelayer of the CuO2 plane and, if so, how such superconductivityin a single CuO2 plane differs from that in a bulk cupratesystem. To answer these questions, studies of the superconductivityin cuprate monolayers are necessary. In this study, we constructeda heterostructure system with a La2-x Sr x CuO4 (LSCO) monolayercontaining a single CuO2 plane and measured the resultingelectronic structures. Monolayer LSCO has metallic and bulk-like electronicstructures. The hole doping ratio of the monolayer LSCO is found todepend on the underlying buffer layer due to the interface effect.Our work will provide a platform for research into ideal two-dimensionalcuprate systems.11Nsciescopu
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
Enhanced ferroelectricity in perovskite oxysulfides
Full text link© 2019 American Physical Society.A sulfur element is a promising anion dopant for synthesizing new multifunctional materials and for exploring unusual physical phenomena. However, owing to its volatility, sulfur substitution to oxide materials is challenging, and thus the sulfurization effects on the associated properties have been limitedly studied. Here, a facile method for sulfurization to a perovskite oxide Pb(Zr,Ti)O3 is developed and demonstrated. A thiourea (CH4N2S) solution is used as a precursor for the sulfurization and its doping-level control. By manipulating the sulfur concentration (x), we systematically examine the physical properties of sulfur-doped Pb(Zr,Ti)O3-xSx films. An enhancement in the tetragonality and ferroelectricity by sulfurization is observed with the band-gap reduction, which is consistent with our theoretical predictions. In the sulfurized films, the ferroelectric phonon modes become softened progressively, probably due to the substitution of apical oxygens with sulfur atoms. Our work is of practical interest for designing ferroelectric photovoltaic devices with high performance
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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