1,721,117 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
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
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
(Bio)Molecular Transport and Recognition in Heavy Ion Track-Etched Polymeric Nanopores
No full textThis thesis is focused on the potential applications of ion track-etched nanopores in polymeric membranes, such as molecular separation, gating and biosensing. The nanopores are fabricated in polyethylene terephthalate (PET) membranes by heavy ion track-etching technique. Ion track technology provides the feasibility to produce membranes with nanopores of desired diameters and geometries. The characterizations of the nanopores are performed by field emission scanning electron microscopy, replica technique and conductometry measurements. Heavy ion irradiation and subsequent track-etching lead to the generation of carboxylic groups (–COOH) on the inner pore walls. At neutral pH, nanopores are cation-selective due to the presence of ionized carboxylate groups (–COO–) on the pore surface. The chemical modification of –COOH groups with amino-terminated molecules switches the surface polarity from negative to positive which in turn flipped the nanopore perm-selective behaviour. Polymeric membranes containing cylindrical nanopores are employed for the transport of ionic organic (bio)molecules through the nanopores. The nanopores have the ability to selectively transport and discriminate the molecules based on their size and charge. For the transport studies main focus is the modulation of pore density, pore diameter, ionic strength of buffer solution and electric field which affect the ionic selectivity and flux of the membrane. Moreover, the polyethyleneimine (PEI) modified pores are also applicable as gate to control the ionic/molecular flux across the membrane. Finally, single (conical and cylindrical) nanopores modified with boronic acid receptor are studied for the molecular recognition of monosaccharides and glycoprotein inside confined geometries. The recognition events are observed by measuring the current – voltage (I–V) curves in an electrolyte solution in the presence of glucose, fructose and glycoprotein separately
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Herstellung und Charakterisierung von Gold-Nanodrähten
No full textThis work deals with the production and characterization of gold nanowires. Employing ion track-etched polycarbonate membranes as templates, the wires were electrochemically deposited in the nanopores. Various techniques including scanning electron microscopy, transmission electron microscopy, and x-ray diffraction were used to characterize the nanowires. Electric transport properties as well as the thermal stability of the wires were investigated in detail.Diese Arbeit beschäftigt sich mit der Herstellung und Charakterisierung poly- und einkristalliner Gold-Nanodrähte. Nanoporöse Template wurden mittels der Ionenstrahltechnik hergestellt, wobei Polymerfolien und energiereiche Schwerionen bestrahlt und anschließend nass-chemisch herausgelöst wurden. In die so hergestellten Nanokanäle wurden Gold-Nanodrähte mit Durchmessern von 25 nm elektrochemisch abgeschieden. Die kristallografischen Eigenschaften der Drähte wurden mittels Röntgendiffraktion , Transmission- und Rasterelektronenmikroskopie untersucht. Potentiostatische Abscheidungen mit Kaliu-_Dicyanoaurat(I)-Elektrolyten führten zu stark texturierten Gold-Nanodrähten, während Pulsabscheidungen orientierte Nanodrähte zur Folge hatten. Die Morphologie der Kappen, welche auf den Drähten wachsen, weist auf die jeweilige bevorzugte Kristallorientierung hin
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