1,720,969 research outputs found
Impedance spectra of Li(Nb,Ta)O3 solid solutions, recorded at 600 °C in air
No full textWe provide the raw impedance spectra of as-grown LiNbO3, LiNb0.5Ta0.5O3 and LiTaO3 samples, measured in air at 600°C. These spectra were recorded using an impedance/gain-phase analyzer (Solartron 1260, Ametek Scientific Instruments, Hampshire, UK) at Clausthal University of Technology. The spectra are provided in the form of Cole-Cole-Diagrams. For details please refer to the article: “ U. Yakhnevych, C. Kofahl, S. Hurskyy, S. Ganschow, Y. Suhak, H. Schmidt, H. Fritze, Charge Transport and Acoustic Loss in Lithium Niobate-Lithium Tantalate Solid Solutions at Temperatures up to 900°C, Solid State Ionics 392 (2023) 116147, https://doi.org/10.1016/j.ssi.2023.116147”
Optical abosrption spectra of congruent LiNbO3 crystal, recorded in the vicinity of the absorption edge during heating in air
No full textWe provide the raw optical absorption spectra of a congruent LiNbO3 sample, recorded near the absorption edge during heating in air (in-situ mode). These measurements were taken using a Perkin Elmer Lambda900 spectrometer at Clausthal University of Technology. The spectra are provided in the form of the absorption coefficient α(E) (in cm⁻¹) as a function of phonon energy (in eV) at temperatures ranging from room temperature up to 1200°C, in 200K increments.
For details please refer to the article: “ P. Gaczyński, Y. Suhak, S. Ganschow, S. Sanna, H. Fritze, K.-D. Becker; High-Temperature Optical Spectroscopy Study of the Fundamental Absorption Edge in the LiNbO3-LiTaO3 Solid Solution, Physica Status Solidi A (2024) 2300972; https://doi.org/10.1002/pssa.202300972
Optical absorption spectra of Li(Nb,Ta)O3 solid solutions in the vicinity of the absorption edge
No full textWe provide the raw optical absorption spectra of LiNb1-xTaxO3 samples, recorded in the vicinity of the absorption edge with the Perkin Elmer Lambda900 spectrometer at Clausthal University of Technology. The measurements include spectra for as-grown and VTE-treated (VTE – Vapor Transport Equilibration) LiNbO3 and LiNb0.94Ta0.06O3 as well as for as-grown LiTaO3. For details please refer to the article: “S. Hurskyy, U. Yakhnevych, C. Kofahl, E. Tichy-Racs, H. Schmidt, S. Ganschow, H. Fritze, Y. Suhak, Electrical Properties and Temperature Stability of Li-Deficient and Near Stoichiometric Li(Nb,Ta)O3 Solid Solutions up to 900 °C, Solid State Ionics 399 (2023) 116285, https://doi.org/10.1016/j.ssi.2023.11628”
Impedance spectrum of single crystalline LiNb0.58Ta0.43O3 solid solution, recorded at 600 °C in air
No full textWe provide the raw impedance spectrum of as-grown LiNb0.58Ta0.42O3 sample, measured in air at 600°C. This spectrum was recorded using an impedance/gain-phase analyzer (Solartron 1260, Ametek Scientific Instruments, Hampshire, UK) at Clausthal University of Technology. The spectrum is provided in the form of Cole-Cole-diagram. For details please refer to the article: “F. El Azzouzi, D. Klimm, A. Kapp, L. M. Verhoff, N. A. Schäfer, S. Ganschow, K.-D. Becker, S. Sanna, H. Fritze, Evolution of the Electrical Conductivity of LiNb1-xTaxO3 Solid Solutions across the Ferroelectric Phase Transformation, Physica Status Solidi A (2024) 2300966; https://doi.org/10.1002/pssa.202300966”
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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