1,720,964 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
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
Application of surface engineering technologies for improvement of diecasting tools quality
Get PDFProučavane su koroziona postojanost i tendencija lepljenja različitih materijala u kontaktu sa tečnom Al–Si–Cu legurom. Ispitivanjem su obuhvaćeni čelik za rad na toplo, plazma nitrirani čelik i dupleks slojevi sa CrN, TiAlN, TiAlSiN i CrAlN prevlakama, različitog nivoa površinske hrapavosti. Za ispitivanja pomenutih fenomena primenjena je metoda izvlačenja, koja je unapređena kako bi se povećale njena tačnost i verodostojnost simulacije procesa livenja. Korozioni efekti su pojačani tako što su uzorci osim kratkog kontakta sa odlivkom zadržavani i u dužim periodima u kontaktu sa tečnom legurom (5 i 20 min). Uprkos opštim stavovima, za ispitivane materijale je ustanovljeno da su sile izvlačenja uzoraka iz Al–Si–Cu odlivaka nezavisne od njihovog hemijskog sastava. Uticaj hrapavosti je izražen kod uzoraka sa prevlakama kod kojih pri smanjenju hrapavosti dolazi do povećanja sile izvlačenja. Sve ispitane prevlake su sklone mehaničkom lepljenju Al–Si–Cu legure za svoje površine, ali sa aspekta korozije u tečnom metalu značajno prevazilaze performanse čelika i plazma nitriranog sloja. Duži kontakt livene legure sa površinama prevlaka uzrokovao je niže vrednosti sila izvlačenja, što je posledica oksidacije površina prevlaka. Ustanovljeno je da su ispitivane prevlake inertne ka tečnoj leguri aluminijuma. Međutim, dolazi do oksidacije i korozije materijala podloge kroz greške rasta koje su prisutne u prevlakama. Stečena znanja o identifikovanim mehanizmima habanja i propadanja zaštitnih slojeva prevlaka poslužiće daljem razvoju dupleks slojeva namenjenih za zaštitu alata za livenje pod pritiskom.Corrosion resistance and soldering tendency of different materials in molten Al–Si–Cu alloy were studied. Hot-working tool steel, plasma nitrided steel and duplex layers with CrN, TiAlN, TiAlSiN and CrAlN top coatings, which were produced to various degree of surface roughness, were covered by the study. An ejection test was employed for investigation of the concerned phenomena. The ejection test was improved in order to increase its accuracy and the reliability of process simulation. Samples were examined in both short and extended periods of contact (5 and 20 min) with liquid casting. Casting solidification was extended in order to intensify the corrosion effects. Contrary to common findings, it was found that the ejection force of the investigated materials does not depend on their chemical composition. For the coated samples, a pronounced dependence of the ejection force on the surface roughness was found. The ejection force increases with decrease in surface roughness. All investigated coatings are prone to mechanical soldering by Al– Si–Cu alloy. Still, their corrosion resistance substantially exceeds the corrosion resistance of steel and plasma nitrided layer. Longer exposure of coated samples to cast alloy induced lower ejection forces, which is a consequence of coatings oxidation. It was found that the investigated coatings are inert to liquid aluminium. However, the underlying material undergoes oxidation and corrosion through coating growth defects. The findings concerning the wear mechanisms of protective layers support further development of duplex layers intended for die casting tools protection
Application of surface engineering technologies for improvement of diecasting tools quality
No full textProučavane su koroziona postojanost i tendencija lepljenja različitih materijala u kontaktu sa tečnom Al–Si–Cu legurom. Ispitivanjem su obuhvaćeni čelik za rad na toplo, plazma nitrirani čelik i dupleks slojevi sa CrN, TiAlN, TiAlSiN i CrAlN prevlakama, različitog nivoa površinske hrapavosti. Za ispitivanja pomenutih fenomena primenjena je metoda izvlačenja, koja je unapređena kako bi se povećale njena tačnost i verodostojnost simulacije procesa livenja. Korozioni efekti su pojačani tako što su uzorci osim kratkog kontakta sa odlivkom zadržavani i u dužim periodima u kontaktu sa tečnom legurom (5 i 20 min). Uprkos opštim stavovima, za ispitivane materijale je ustanovljeno da su sile izvlačenja uzoraka iz Al–Si–Cu odlivaka nezavisne od njihovog hemijskog sastava. Uticaj hrapavosti je izražen kod uzoraka sa prevlakama kod kojih pri smanjenju hrapavosti dolazi do povećanja sile izvlačenja. Sve ispitane prevlake su sklone mehaničkom lepljenju Al–Si–Cu legure za svoje površine, ali sa aspekta korozije u tečnom metalu značajno prevazilaze performanse čelika i plazma nitriranog sloja. Duži kontakt livene legure sa površinama prevlaka uzrokovao je niže vrednosti sila izvlačenja, što je posledica oksidacije površina prevlaka. Ustanovljeno je da su ispitivane prevlake inertne ka tečnoj leguri aluminijuma. Međutim, dolazi do oksidacije i korozije materijala podloge kroz greške rasta koje su prisutne u prevlakama. Stečena znanja o identifikovanim mehanizmima habanja i propadanja zaštitnih slojeva prevlaka poslužiće daljem razvoju dupleks slojeva namenjenih za zaštitu alata za livenje pod pritiskom.Corrosion resistance and soldering tendency of different materials in molten Al–Si–Cu alloy were studied. Hot-working tool steel, plasma nitrided steel and duplex layers with CrN, TiAlN, TiAlSiN and CrAlN top coatings, which were produced to various degree of surface roughness, were covered by the study. An ejection test was employed for investigation of the concerned phenomena. The ejection test was improved in order to increase its accuracy and the reliability of process simulation. Samples were examined in both short and extended periods of contact (5 and 20 min) with liquid casting. Casting solidification was extended in order to intensify the corrosion effects. Contrary to common findings, it was found that the ejection force of the investigated materials does not depend on their chemical composition. For the coated samples, a pronounced dependence of the ejection force on the surface roughness was found. The ejection force increases with decrease in surface roughness. All investigated coatings are prone to mechanical soldering by Al– Si–Cu alloy. Still, their corrosion resistance substantially exceeds the corrosion resistance of steel and plasma nitrided layer. Longer exposure of coated samples to cast alloy induced lower ejection forces, which is a consequence of coatings oxidation. It was found that the investigated coatings are inert to liquid aluminium. However, the underlying material undergoes oxidation and corrosion through coating growth defects. The findings concerning the wear mechanisms of protective layers support further development of duplex layers intended for die casting tools protection
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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