1,720,965 research outputs found
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
Electrical and morphological properties of polystyrene thin films for organic electronic applications.
Get PDFThis study investigates the electrical and morphological properties of polystyrene layers in the nanometre thickness range for organic and polymer based electronic applications. The paper aims to providing conduction data and information on trapped charges present in the polystyrene layer, as well as investigating how polystyrene properties change under differing annealing conditions. The maximum dielectric strength was found to be 4.0 MV cm−1, while fixed trapped charge and mobile trapped charge average densities were calculated to be 9.9 × 10^11 cm−2 and 2.6 × 10^12 cm−2 respectively. Optimum electrical characteristics were obtained at an anneal temperature of 90 °C, which is just below the glass transition temperature for polystyrene.The first author would like to thank the Engineering and Physical Sciences Research Council EPSRC and the National Physical Laboratory NPL for the financial support received for his studentship. The second author would like to thank EPSRC for the financial support Grant No. EP/ E047785/1
First contact-charging of gold nanoparticles by electrostatic force.
Get PDFThe use of nanoparticle materials in the manufacture of electronic polymer memory devices is on
the rise. Organic memory devices are fabricated by depositing a blend of organic polymer, small
organic molecules, and nanoparticles between two metal electrodes. The primary aim is to produce
devices that exhibit two distinct electrical conductance states when control voltages are applied. By
retaining the states when power is removed can be viewed as the realization of nonvolatile memory.
In this letter, an attempt is made to further understand the conundrums that scholars in this field are
currently facing, with questions about the nanoparticle charging mechanism being investigate.The first author would like to thank the Engineering and
Physical Sciences Research Council EPSRC and the National
Physical Laboratory NPL for the financial support
received for his studentship. The second author would like
to thank EPSRC for the financial support Grant No. EP/
E047785/1
Making plastic remember: electrically rewritable polymer memory devices.
Get PDFOrganic based electronic memory devices are currently receiving an unprecedented amount attention as possible alternatives for conventional semiconductor memories, due to their simple device structures, ease of fabrication, compatibility with flexible substrates and low cost. Polymer memory devices (PMDs) based on active layers containing gold nanoparticles (Q-Au) with 8-hydroxyquinoline (8HQ) will be presented in this report. Memory performance attributes will also be presented, which are less reported in the literature, but still essential for the realisation of viable organic memory technologies.The first author would like to thank the Engineering and Physical Sciences Research Council EPSRC and the National Physical Laboratory NPL for the financial support received for his studentship. The second author would like to thank EPSRC for the financial support Grant No. EP/ E047785/1
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
Overview of organic memory devices.
Get PDFThe demand for more efficient and faster memory structures is greater today than ever before. The efficiency of memory structures is measured in terms of storage capacity and the speed of functioning. However, the production cost of such configurations is the natural constraint on how much can be achieved. Organic memory devices (OMDs) provide an ideal solution, in being inexpensive, and at the same time promising high performance. However, all OMDs reported so far suffer from multiple drawbacks that render their industrial implementation premature. This article introduces the different types of OMDs, discusses the progress in this field over the last 9 years and invokes conundrums that scholars of this field are currently faced with, such as questions about the charging mechanism and stability of devices, contradictions in the published work and some future directions.The first author would like to thank the Engineering and Physical Sciences Research Council EPSRC and the National Physical Laboratory NPL for the financial support received for his studentship. The second author would like to thank EPSRC for the financial support Grant No. EP/ E047785/1
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
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