1,720,963 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
Functionalization of surfaces by micro laser cladding
No full textIn der vorliegenden Arbeit werden Ergebnisse der Systemtechnik- und Verfahrensentwicklung zur Verkleinerung der erreichbaren Strukturgrößen (Einzelspurgeometrie) beim Mikro-Laserauftragschweißen mit pulverförmigen Zusatzwerkstoffen vorgestellt. Schwerpunkt der Systemtechnikentwicklung sind die Komponenten Pulverförderer, Pulververteiler, Transportleitungen und Pulverdüse inklusive Schutzgasabschirmung. Ziele sind die Förderung von nicht fließfähigen Pulverwerkstoffen (mittlerer Pulverpartikeldurchmesser d50< 10 µm), die Reduzierung des Pulverfokusdurchmessers der Pulverdüse, eine gute Abschirmung der Bearbeitungsstelle durch das Schutzgas sowie die Vermeidung von Ablagerungen im Transportleitungssystem. Durch die Integration eines Bürstenförderers und die Verwendung von 316L mit einer Pulverkornfraktion d50= 4,7 µm wird gezeigt, dass sich Einzelspurgeometrien (hES x bES x t) von 25 x 6 x 1 µm3 realisieren lassen. Durch die Verwendung einer außen liegenden Schutzgasglocke und die Anpassung der Gasvolumenströme werden Pulverfokusdurchmesser von 200 - 240 µm bei 40 ppm Sauerstoffgehalt an der Bearbeitungsstelle erreicht.Bei der Verfahrensentwicklung werden für die Herstellung von Einzelspuren mit Einzelspurbreiten zwischen 25 und 50 µm Prozessfehler wie auftretender Overspray untersucht sowie ein systematischer Ansatz zur Untersuchung der Topographie und des Aufmischungsgrades von Einzelspuren und Schichten präsentiert. Neben den grundlegenden Untersuchungen mit eisenbasierten Zusatzwerkstoffen werden Ergebnisse mit Edelmetallen (Gold und Silber) als Zusatzwerkstoff für die Herstellung von Kontaktpunkten auf Bipolarplatten für Brennstoffzellen und für Tantal bei der Herstellung von röntgensichtbaren Markierungen auf Stents durch Mikro-Laserdispergieren gezeigt. Die verzugsfreie Herstellung von Goldkontaktpunkten mit den Abmessungen 60x30 µm auf metallischen Bipolarplatten (d= 100 µm) für Brennstoffzellen führt zu einer Halbierung der Degradation einer aufgebauten Zelle und einer Erhöhung der Zellleistung um 30%, so dass die Zellleistung mit konventionellen graphitischen Bipolarplatten vergleichbar ist. Dabei wird nur 1/100 der Menge an Gold eingesetzt, die bei einer konventionellen galvanischen Beschichtung der metallischen Bipolarplatte notwendig ist. Bei der Dispersion von Tantalpartikel in die Endlöffel von Nitinol-Stents mit einer Wandstärke von 0,2 mm wird die Eignung dieses Verfahrens für die Herstellung von Röntgenmarkierungen auf 1 x 1,5 mm großen Endlöffeln gezeigt.The system technology and process development for decreasing the achievable structure sizes (track geometry) for the micro laser cladding process with powder as additive material is presented. The main focus during the system technology development lies on the components powder feeder, powder distributor, transport tubes and powder nozzle including the shielding gas system. Aim is to allow the feeding of non flowable powders (powder particle sizes d50< 10 µm), to decrease the powder focus diameter of the powder nozzle, to achieve a good protection of the melting pool with shielding gas and to avoid powder agglomeration in the transport tubes. By integrating a brush feeder and using 316L with d50= 4,7 µm as additive material the realization of single tracks with a track geometry (hES x bES x t) of 25 x 6 x 1 µm3 is shown. With a coaxial powder nozzle, an outer shielding gas nozzle and the adaptation of the gas flows powder focus diameters between 200 and 240 µm can be realized. During the process development of tracks with a width between 25 and 50 µm typical process deviations as overspray are discussed and a systematic approach concerning the topography and dilution of single tracks and layers in dependence of the process parameters is presented. Beside the results of the basic investigations performed with iron based alloys as additive material results with precious metals (gold and silver) for the manufacturing of contacts on bipolar plates for fuel cells and tantalum for the manufacturing of x-ray markers on stents are presented. By laser cladding of gold contacts with a contact geometry of 60 x 30 µm2 on bipolar plates (d= 100 mm) of metallic fuel cells the degradation of an assembled fuel cell stack can be reduced by factor 2 and the output power increased by 30% so that the output power is comparable to conventional bipolar plates made of carbon. For the selective laser cladding with gold as additive material only 1/100 of the amount of material is necessary compared with a conventional galvanic coating. By laser dispersing tantalum particles in an area of 1 x 1.5 mm2 on nitinol stents with a wall thickness of 200 µm the feasibility of this process is shown for the manufacturing of x-ray visibility markers
Funktionalisierung von Bauteiloberflächen durch Mikro-Laserauftragschweißen
No full textThe system technology and process development for decreasing the achievable structure sizes (track geometry) for the micro laser cladding process with powder as additive material is presented. The main focus during the system technology development lies on the components powder feeder, powder distributor, transport tubes and powder nozzle including the shielding gas system. Aim is to allow the feeding of non flowable powders (powder particle sizes d50< 10 µm), to decrease the powder focus diameter of the powder nozzle, to achieve a good protection of the melting pool with shielding gas and to avoid powder agglomeration in the transport tubes. By integrating a brush feeder and using 316L with d50= 4,7 µm as additive material the realization of single tracks with a track geometry (hES x bES x t) of 25 x 6 x 1 µm3 is shown. With a coaxial powder nozzle, an outer shielding gas nozzle and the adaptation of the gas flows powder focus diameters between 200 and 240 µm can be realized. During the process development of tracks with a width between 25 and 50 µm typical process deviations as overspray are discussed and a systematic approach concerning the topography and dilution of single tracks and layers in dependence of the process parameters is presented. Beside the results of the basic investigations performed with iron based alloys as additive material results with precious metals (gold and silver) for the manufacturing of contacts on bipolar plates for fuel cells and tantalum for the manufacturing of x-ray markers on stents are presented. By laser cladding of gold contacts with a contact geometry of 60 x 30 µm2 on bipolar plates (d= 100 mm) of metallic fuel cells the degradation of an assembled fuel cell stack can be reduced by factor 2 and the output power increased by 30% so that the output power is comparable to conventional bipolar plates made of carbon. For the selective laser cladding with gold as additive material only 1/100 of the amount of material is necessary compared with a conventional galvanic coating. By laser dispersing tantalum particles in an area of 1 x 1.5 mm2 on nitinol stents with a wall thickness of 200 µm the feasibility of this process is shown for the manufacturing of x-ray visibility markers
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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