1,720,985 research outputs found
Electrical Carrier Activation in Zn+ implanted and low-power Pulsed Laser Annealed InP in Nitrogen Atmosphere
No full textLow-power pulsed-laser annealing was applied to Zn+-implanted InP samples. In order to avoid surface oxidation during the treatment, the laser irradiation was carried out in inert ambients of different gases (Ar or N2) at different pressures. Reflection high energy electron diffraction (RHEED), Rutherford backscattering spectroscopy (RBS) and electrical measurements were used to analyse the physical properties of the samples before and after the laser annealing process. In particular, it has been possible to demonstrate that the chemical properties of the gas used play a crucial role in the electrical carrier activation (about 80%) of the processed InP sample
Effects of Low-Power Pulsed-Laser Annealing on electrical properties of Zn-implanted InP
No full textLow-Power Pulsed-Laser Annealing (LPPLA) has been applied to Zn-implanted InP samples kept in a controlled atmosphere (Ar or N-2). The chemical properties of the used gas play a crucial role to give rise to the electrical carrier activation (about 80%) of the processed InP. (C) 1998 Elsevier Science Ltd. All rights reserved
In-depth characterization of electrical carrier activation in Zn+ implanted and laser annealed InP
No full textLow-power pulsed-laser annealing has been applied to Zn1-implanted InP samples in N2 atmosphere, attaining structural
reordering and high electrical activation. The in-depth hole carrier concentration distribution has been compared with the indepth
implanted Zn distribution: a [Zn] plateau appears where the activation is about 100%
Effects of the annealing atmosphere on the electrical properties of low-power pulsed-laser annealed Zn implanted InP
No full textThe e!ects of N2 annealing atmosphere on implanted and low-power pulsed-laser annealed (LPPLA) InP
matrix are discussed. The analyses were performed, by using several complementary techniques such as RBS,
Raman spectroscopy, SIMS and electrical measurements. It has been demonstrated that in suitable annealing
conditions, namely nitrogen ambient, it is possible to achieve a complete reordering of the damaged
structure and a very high electrical carrier activation (&80%). In this paper, the contribution of the nitrogen
atoms to the mechanism a!ecting the electrical characteristic of the implanted and laser annealed samples is
discussed
Carrier activation in implanted GaAs treated with a combination of thermal and laser annealing
No full text
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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