1,723,770 research outputs found
Electronic health records and improved nursing management of chronic obstructive pulmonary disease [Corrigendum]
No full textLiu F, Zou Y, Huang Q, Zheng L, Wang W. Patient Preference and Adherence. 2015;9:495–500.On page 495, author affiliations and correspondence sections “The First Affiliated College of Medicine, Zhejiang University” should be “The First Affiliated Hospital, College of Medicine, Zhejiang University”.Read the original articl
Carbon-acceptor-induced cascade scattering by acoustic phonons above the (e,A(0)) threshold in GaAs
No full textBelow the E-0 band gap of GaAs the transitions of free electrons to bound impurity states play an important role. Our study of Raman scattering above the (e,A(0)) threshold at 2 K shows that the electrons are scattered by acoustic phonons before successively being scattered by one LO phonon and finally recombining the holes bound to the acceptors. This finding indicates one of important mechanisms of relaxation of the hot electrons excited above the minimum of conduction band
Impurity-induced resonance Raman scattering at the (e, A(0)) threshold in lightly carbon-doped p-type GaAs at 2 K
No full textIn lightly carbon-doped p-type GaAs the impurity-induced resonance Raman scattering (RRS) by one longitudinaloptic (LO) phonon has been studied at low temperature by using a tunable Ti-sapphire laser. In spite of involvement of strong luminescence in the spectral region of the Raman scattering, a pronounced scattering resonance at the (e, A(0)) threshold has been well identified. Both the extrinsic LO-Raman scattering and the luminescence of (e, A(0)) LO phonon replicas have been analyzed in a quantitative way. We find that carbon-acceptor-induced extrinsic scattering is fairly intense compared to the intrinsic Raman scattering. It is interpreted in terms of the large oscillator strength of the (e, A(0)) transition. Compared to the intrinsic scattering due to free electron-hole pairs, the large (e, A(0)) oscillator strength leads to about two orders of magnitude enhancement in the Raman intensity. (C) 2002 Elsevier Science B.V. All rights reserved
Carbon-acceptor-induced cascade scattering by acoustic phonons above the (e,A(0)) threshold in GaAs
No full textBelow the E-0 band gap of GaAs the transitions of free electrons to bound impurity states play an important role. Our study of Raman scattering above the (e,A(0)) threshold at 2 K shows that the electrons are scattered by acoustic phonons before successively being scattered by one LO phonon and finally recombining the holes bound to the acceptors. This finding indicates one of important mechanisms of relaxation of the hot electrons excited above the minimum of conduction band
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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