1,720,954 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
Production of filament from polyvinyl alcohol and microcrystalline cellulose
Get PDFUporaba aditivnih tehnologij je v porastu. Ena izmed teh je tudi tehnologija ciljnega nalaganja. 3D tiskalniki, ki delujejo po principu ciljnega nalaganja, uporabljajo filamente iz različnih polimerov. Zaradi svetovnih razmer so v ospredju raziskav biorazgradljivi materiali. V nalogi obravnavamo izdelavo okolju prijaznega filamenta za 3D tiskalnik iz polivinil alkohola z dodatkom mikrokristalne celuloze za izboljšanje mehanskih lastnosti. Izdelali smo testne granule iz polivinil alkohola in mikrokristalne celuloze v različnih koncentracijah. S postopkom ekstruzije smo granule pretvorili v filamente z različnimi vsebnostmi celuloze. Na vzorcih filamentov smo opravili optične analize in dimenzijske meritve. Ugotovili smo, da so filamenti v večini homogeni in dobro strukturirani. Vendar so za uporabo filamenta na 3D tiskalniku še potrebne dodelave.The use of additive manufacturing technologies is on the rise. One of these is also Fused Filament Fabrication. 3D printers, that use FFF technology, use polymer filaments. Due to the global situation, biodegradable materials are at the forefront of research. The aim of the thesis is to make an environmentally friendly filament for 3D printers from polyvinyl alcohol with the addition of microcrystalline cellulose to improve mechanical properties. Test granules from polyvinyl alcohol and microcrystalline cellulose in different concentrations were transformed into filaments with different cellulose contents using extrusion process. Optical analyses and dimensional measurements were carried out on filament samples. We found out that filaments are mostly homogenous and well structured. But for use on a 3D printer out methodology needs some finishing
Construction of a tensile tester for light loads
No full textPri razvoju in izdelavi biorazgradljivih polimernih filamentov se pojavljajo problemi s premajhno trdnostjo in krhkostjo materiala. Vse izdelke je potrebno testirati, da se lahko optimira parametre izdelave. Kot podpora izdelavi biorazgradljivih materialov smo v sklopu dela zasnovali in izdelali manjšo napravo za natezni preizkus, ki bo na voljo pri izdelavi filamentov. Za osnovo je bila vzeta kovinska konstrukcija odslužene naprave za merjenje hrapavosti. Izdelali smo sistem za merjenje sile z merilno celico in raztezka s kamero. Izvedli smo natezne preizkuse na filamentih ter natisnjenih epruvetah in preverili ali sistem ustreza standardu ISO 527, ki določa pravila za merjenje nateznih lastnosti plastik.In the development and production of biodegradable polymer filaments, problems arise with insufficient strength and fragility of the material. All products must be tested in order to optimize the manufacturing parameters. To support the production of biodegradable materials, we have designed and produced a small device for tensile testing, which will be available during the production of filaments. The metal structure of roughness measuring device, which was no longer in use, was taken as the basis. We made a system for measuring force with a measuring cell and elongation with a camera. We performed tensile tests on filaments and printed tubes and checked whether the system complies with the ISO 527 standard, which defines the rules for measuring the tensile properties of plastics
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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