1,721,047 research outputs found
User innovation and network effects. The case of video games
No full textNew models of knowledge creation are emerging, where the user community is a major source of innovation development. But, how does user innovation impact on producer sales, and the other way round? In this paper, the mutual benefits deriving from the user-producer interaction are analyzed in terms of network effects and on a basis of a unique panel data set of weekly observations in the context of video games and their user-generated, free modifications. The estimates of a system of equations modelling the original good’s retail demand function and the user innovation dynamics show that user-generated complements spur the demand for the original product and smooth the consumer price sensitivity. User innovation increases with the crowd of complementors up to a certain threshold and decreases afterwards, thus following a non-monotonic pattern
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
Natural occurrence of ochratoxin a in confined reared and grazing pigs derived products
Full text linkOchratoxin A (OTA) is a well-known nephrotoxic and immunotoxic mycotoxin occurring in several foods and feeds. OTA residues have been detected as a carryover in pigs and poultry meats. In this study samples of pigs fresh tissues (muscle, back-fat) and processed meat products (seasoned muscle-coppa, seasoned backfat-lard, mortadella and salami) were obtained from pigs raised following two breeding systems: conventional production systems (indoor) and alternative pig rearing systems (free outdoor access). Pigs tissues and meat products samples were analysed for OTA content by means of an HPLC-FLD method. OTA was found in all pigs tissues and meat products at concentration lower than the Italian recommended maximum level of 1 μg/kg, only a sample of mortadella of indoor group showed a concentration very close to this limit. This study suggests that the contribution from pig fresh tissues to the total intake of the toxin is small if compared to other sources. However, the OTA occurrence in some derived products, such as mortadella, seems to be of some concern
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
Antisemiti militanti, antisemiti funzionari, profittatori e altra misera umanità
No full textIl saggio intende offrire un contributo alla storia dell’antisemitismo italiano di cui si evidenziano la corposità, i diversi approcci da parte dei persecutori e gli effetti nelle vite dei perseguitati.
L’analisi dell’antisemitismo, quando esso diventa di Stato, consente l’individuazione di figure persecutorie che possono essere distinte in ‘antisemiti militanti’ (quanti scrivono o agiscono per convinzione antisemita o comunque mettendo in mostra una concezione antisemita), ‘antisemiti funzionari’ (in genere i dipendenti dello Stato e delle amministrazioni locali che applicano con sistematicità le sue disposizioni, ma anche addetti a strutture diverse, quali banche, soprintendenze alle Belle arti che operano burocraticamente per valutare o incamerare i beni sottratti agli ebrei), ‘profittatori’ (coloro che denunciano per subentrare nelle attività degli ebrei o per entrare in possesso dei loro averi) e altri che denunciano o aiutano i nazisti a scovare gli ebrei, a partire dal settembre 1943, per accodarsi al potente di turno e ottenere così una visibilità altrimenti irraggiungibile, o anche solo per un livore personale che l'antisemitismo di Stato permette di farsi pubblico e di avere incidenza nella realtà. Si deve ricordare che 6.291 furono gli ebrei italiani vittime della persecuzione razziale, morti in deportazione o nel corso di eccidi in patria.
L'articolazione in 'antisemiti militanti', 'antisemiti funzionari', 'profittatori' e 'altra misera umanità' consente inoltre di meglio comprendere gli stessi salti di qualità che si riscontrano nell'antisemitismo del periodo compreso fra la metà degli anni Trenta e la metà degli anni Quaranta.
Grazie all'utilizzo di fonti diverse, d'archivio e a stampa, emerge in tutto il suo spessore l'antisemitismo italiano del periodo in cui si giunse persino a organizzare veri e propri corsi di razzismo con consigli su come procedere al fine della totale 'purificazione della razza'
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