1,720,958 research outputs found
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
Appropriate 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Surface modification of cobalt-chromium based implant materials
No full textPotreba za razvojem implantne tehnologije sve se više javlja zbog porasta broja starije populacije koja je sklona oštećenjima koštanih tkiva. Implantni materijali moraju biti sposobni imitirati strukturu i mehanička svojstva tkiva, organa ili kosti kako bi implantati u konačnici uspješno nadomjestili funkciju strukture za zamjenu. No, ugradnjom metalnih implantnih materijala u agresivni okoliš ljudskog tijela može doći do korozije (degradacije) materijala te je stoga važno istražiti korozijsku otpornost istih. Legura na bazi kobalt-krom-molibdena (CoCrMo) koristi se za izradu ortopedskih implantata zbog svojih superiornih mehaničkih svojstava i dobre korozijske otpornosti, ali ista nije bioaktivna. Stoga se u ovom radu, modifikacijom površine legure stvaranjem prevlake na bazi kalcijevih fosfata (CaP), nastoje povećati korozijska otpornost i stupanj bioaktivnosti. Formiranjem CaP prevlake na površini CoCrMo legure kombiniraju se mehanička svojstva metalne legure sa osteokonduktivnim svojstvima kalcijevih fosfata. Modifikacija površine CoCrMo legure provedena je metodom elektrodepozicije; uvjeti elektrodepozicije određeni su metodom cikličke voltametrije (CV). Uspješnost formiranja prevlake potvrđena je optičkom mikroskopijom (OM) i infracrvenom spektroskopijom s Fourierovom transformacijom uz prigušenu totalnu refleksiju (ATR – FTIR). Usporedba elektrokemijskog ponašanja nemodificirane CoCrMo legure i CaP modificirane legure provedena je korištenjem izmjeničnih i istosmjernih elektrokemijskih metoda, koje uključuju metodu određivanja polarizacijskog otpora (eng. Linear Polarization Resistance LPR), metodu Tafelove ekstrapolacije i elektrokemijsku impedancijsku spektroskopiju (EIS) provedenu u simuliranoj tjelesnoj tekućini, Hanksovoj otopini u in vitro uvjetima.The need for development of implant technology is rising due to the increasing proportion of the elderly population who are prone to bone tissue damage. Implant materials must be able to imitate the structure and mechanical properties of tissue, organe or bones in order for implants to successfully replace the functionality of wanted structure. However, after the implantation of metallic implant materials into the aggressive environment of the human body, corrosion (degradation) of the material can occur, so the corrosion resistance of metallic implant materials is examined. An alloy based on cobalt-chromium-molybdenum (CoCrMo) is used as an orthopeadic implant due to its superior mechanical properties and good corrosion resistance, but this alloy is not bioactive. Hence, in this work the CaP coating is formed on the surface of CoCrMo alloy in order to increase the corrosion resistance and bioactivity. The formation of CaP coating on the alloy surface combines the mechanical properties of metal alloy with the osteoconductive properties of CaP materials. Surface modificitaion was performed by electrodeposition method with electrodeposition conditions determined by cyclic voltammetry (CV) method. The successful formation of CaP coating was confirmed by optical microscopy (OM) and attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR). The comparison of electrochemical behaviour of unmodified and CaP modified CoCrMo alloy was performed using ac and dc electrochemical methods, including linear polarization resistance (LPR), Tafel extrapolation method and electrochemical impedance spectroscopy (EIS) performed in simulated body fluid, Hank’s solution under in vitro conditions
Surface modification of cobalt-chromium based implant materials
No full textPotreba za razvojem implantne tehnologije sve se više javlja zbog porasta broja starije populacije koja je sklona oštećenjima koštanih tkiva. Implantni materijali moraju biti sposobni imitirati strukturu i mehanička svojstva tkiva, organa ili kosti kako bi implantati u konačnici uspješno nadomjestili funkciju strukture za zamjenu. No, ugradnjom metalnih implantnih materijala u agresivni okoliš ljudskog tijela može doći do korozije (degradacije) materijala te je stoga važno istražiti korozijsku otpornost istih. Legura na bazi kobalt-krom-molibdena (CoCrMo) koristi se za izradu ortopedskih implantata zbog svojih superiornih mehaničkih svojstava i dobre korozijske otpornosti, ali ista nije bioaktivna. Stoga se u ovom radu, modifikacijom površine legure stvaranjem prevlake na bazi kalcijevih fosfata (CaP), nastoje povećati korozijska otpornost i stupanj bioaktivnosti. Formiranjem CaP prevlake na površini CoCrMo legure kombiniraju se mehanička svojstva metalne legure sa osteokonduktivnim svojstvima kalcijevih fosfata. Modifikacija površine CoCrMo legure provedena je metodom elektrodepozicije; uvjeti elektrodepozicije određeni su metodom cikličke voltametrije (CV). Uspješnost formiranja prevlake potvrđena je optičkom mikroskopijom (OM) i infracrvenom spektroskopijom s Fourierovom transformacijom uz prigušenu totalnu refleksiju (ATR – FTIR). Usporedba elektrokemijskog ponašanja nemodificirane CoCrMo legure i CaP modificirane legure provedena je korištenjem izmjeničnih i istosmjernih elektrokemijskih metoda, koje uključuju metodu određivanja polarizacijskog otpora (eng. Linear Polarization Resistance LPR), metodu Tafelove ekstrapolacije i elektrokemijsku impedancijsku spektroskopiju (EIS) provedenu u simuliranoj tjelesnoj tekućini, Hanksovoj otopini u in vitro uvjetima.The need for development of implant technology is rising due to the increasing proportion of the elderly population who are prone to bone tissue damage. Implant materials must be able to imitate the structure and mechanical properties of tissue, organe or bones in order for implants to successfully replace the functionality of wanted structure. However, after the implantation of metallic implant materials into the aggressive environment of the human body, corrosion (degradation) of the material can occur, so the corrosion resistance of metallic implant materials is examined. An alloy based on cobalt-chromium-molybdenum (CoCrMo) is used as an orthopeadic implant due to its superior mechanical properties and good corrosion resistance, but this alloy is not bioactive. Hence, in this work the CaP coating is formed on the surface of CoCrMo alloy in order to increase the corrosion resistance and bioactivity. The formation of CaP coating on the alloy surface combines the mechanical properties of metal alloy with the osteoconductive properties of CaP materials. Surface modificitaion was performed by electrodeposition method with electrodeposition conditions determined by cyclic voltammetry (CV) method. The successful formation of CaP coating was confirmed by optical microscopy (OM) and attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR). The comparison of electrochemical behaviour of unmodified and CaP modified CoCrMo alloy was performed using ac and dc electrochemical methods, including linear polarization resistance (LPR), Tafel extrapolation method and electrochemical impedance spectroscopy (EIS) performed in simulated body fluid, Hank’s solution under in vitro conditions
Surface modification of cobalt-chromium based implant materials
No full textPotreba za razvojem implantne tehnologije sve se više javlja zbog porasta broja starije populacije koja je sklona oštećenjima koštanih tkiva. Implantni materijali moraju biti sposobni imitirati strukturu i mehanička svojstva tkiva, organa ili kosti kako bi implantati u konačnici uspješno nadomjestili funkciju strukture za zamjenu. No, ugradnjom metalnih implantnih materijala u agresivni okoliš ljudskog tijela može doći do korozije (degradacije) materijala te je stoga važno istražiti korozijsku otpornost istih. Legura na bazi kobalt-krom-molibdena (CoCrMo) koristi se za izradu ortopedskih implantata zbog svojih superiornih mehaničkih svojstava i dobre korozijske otpornosti, ali ista nije bioaktivna. Stoga se u ovom radu, modifikacijom površine legure stvaranjem prevlake na bazi kalcijevih fosfata (CaP), nastoje povećati korozijska otpornost i stupanj bioaktivnosti. Formiranjem CaP prevlake na površini CoCrMo legure kombiniraju se mehanička svojstva metalne legure sa osteokonduktivnim svojstvima kalcijevih fosfata. Modifikacija površine CoCrMo legure provedena je metodom elektrodepozicije; uvjeti elektrodepozicije određeni su metodom cikličke voltametrije (CV). Uspješnost formiranja prevlake potvrđena je optičkom mikroskopijom (OM) i infracrvenom spektroskopijom s Fourierovom transformacijom uz prigušenu totalnu refleksiju (ATR – FTIR). Usporedba elektrokemijskog ponašanja nemodificirane CoCrMo legure i CaP modificirane legure provedena je korištenjem izmjeničnih i istosmjernih elektrokemijskih metoda, koje uključuju metodu određivanja polarizacijskog otpora (eng. Linear Polarization Resistance LPR), metodu Tafelove ekstrapolacije i elektrokemijsku impedancijsku spektroskopiju (EIS) provedenu u simuliranoj tjelesnoj tekućini, Hanksovoj otopini u in vitro uvjetima.The need for development of implant technology is rising due to the increasing proportion of the elderly population who are prone to bone tissue damage. Implant materials must be able to imitate the structure and mechanical properties of tissue, organe or bones in order for implants to successfully replace the functionality of wanted structure. However, after the implantation of metallic implant materials into the aggressive environment of the human body, corrosion (degradation) of the material can occur, so the corrosion resistance of metallic implant materials is examined. An alloy based on cobalt-chromium-molybdenum (CoCrMo) is used as an orthopeadic implant due to its superior mechanical properties and good corrosion resistance, but this alloy is not bioactive. Hence, in this work the CaP coating is formed on the surface of CoCrMo alloy in order to increase the corrosion resistance and bioactivity. The formation of CaP coating on the alloy surface combines the mechanical properties of metal alloy with the osteoconductive properties of CaP materials. Surface modificitaion was performed by electrodeposition method with electrodeposition conditions determined by cyclic voltammetry (CV) method. The successful formation of CaP coating was confirmed by optical microscopy (OM) and attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR). The comparison of electrochemical behaviour of unmodified and CaP modified CoCrMo alloy was performed using ac and dc electrochemical methods, including linear polarization resistance (LPR), Tafel extrapolation method and electrochemical impedance spectroscopy (EIS) performed in simulated body fluid, Hank’s solution under in vitro conditions
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