1,721,062 research outputs found
Charge Transport in Organic Semiconductors: A Multiscale Modelling, in Functional Supramolecular Architectures: for Organic Electronics and Nanotechnology
No full textThe chapter reviews modern approaches to the modelling and simulation of charge transport in organic semiconductors
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
Functionalization and Assembling of Inorganic Nanocontainers for Optical and Biomedical Applications
No full textAppropriate 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
High photo and electroluminescence efficiency oligothiophenes
No full textWe report photo and electroluminescence efficiency of a thiophene oligomer functionalized to enhance its solid-state efficiency. We find that the absolute PL quantum yield is up to 37% for spin-coated thin films of the compound. The material has been used as active material in organic light-emitting diodes (LEDs). EL efficiencies up to 0.9 cd/A are demonstrated in LEDs prepared with a blend indium tin oxide and Ca–Al electrodes
PHOTOLUMINESCENT LIGHT SOURCE ARRAYS BY SINERGIC INTEGRATION OF CONJUGATED LUMINESCENT POLYMERS AND THREE-DIMENSIONAL SILICON MICROSTRUCTURES
No full textIn this work, a novel and straightforward technology for the fabrication of two-dimensional (2D) arrays of photolu-minescent light-sources by selective integration of conjugated luminescent polymers into three-dimensional (3D) silicon microstructures is presented [1]. Poly(9,9-di-n-octylfluorene-alt-benzothiadiazole) (F8BT) infiltration into 3D silicon microstructures integrating 2D arrays of square holes with different sizes, periods, and aspect ratios (ARs, hole depth-to-width ratio) is investigated by means of three different approaches, namely, spin-coating, dip-coating and drop-casting/slow solvent evaporation. The microstructure, which is fabricated by electrochemical mi-cromachining (ECM) technology [2], consists of a 2D array of 40-μm-side square holes with spatial periods of 70 μm integrated with a 2D array of 4-μm-side square holes with spatial periods of 10 μm. Both the arrays feature hole depths of about 50 μm, thus combining, on the same silicon die, low-AR holes (about 1) and high-AR holes (about 10). Notably, by properly choosing the deposition method, F8BT can be selectively infiltrated in either low- or high-AR holes. Fluorescence microscopy clearly highlights that each polymer-infiltrated hole behaves as a single light-source, due to the confinement effect exerted by the microstructure features on the polymer light-emission in the out-of-plane direction, independently of AR value, size and period. Such a synergic integration of luminescent pol-ymers and silicon microstructures paves the way for new exciting applications, ranging from photonics (e.g. flat panel displays) to medicine (e.g. label-free circulating tumor cell targeting)
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