1,721,169 research outputs found
Distribution of osteonic and interstitial components in the human femoral shaft with reference to structure, calcification and mechanical properties
No full textThis paper analyzes the distribution of osteons and interstitial bone in the femoral compacta according to their structure, degree of calcification and mechanical properties. Three cross sections, 100 μm thick, each located 1 cm from the next, were prepared by grinding from the middle third of a human femoral shaft. Starting from the premise that in lamellar bone, lamellae whose fiber bundles and crystallites have a longitudinal course withstand loading by tension, whereas those whose fiber bundles and crystallites have a transversal course withstand loading by compression, each osteon and fragment of interstitial bone has been given a number recording the percentage of its surface consisting of lamellae with transversally oriented fiber bundles and crystallites (bright under the polarizing microscope). The degree of calcification of the same structures was determined microradiographically. The distribution of both osteons and interstitial bone was assessed using a tungsten grid for reference. The total surface of each bone microstructure, and the percentage of that surface consisting of bright lamellae, were all calculated using a Zeiss Videoplan. Our results confirm the view that the distribution of both osteons and interstitial bone is mainly related to their structure - and hence to their mechanical properties. In addition, bone remodeling seems to be most active in areas capable of supporting tensile stress
L’innovazione pedagogica e didattica nel sistema formativo italiano dall’Unità al secondo dopoguerra
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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
Il futuro della ricerca pedagogica tra internazionalizzazione e nuove forme di valutazione
No full textLa valutazione della ricerca scientifica in Italia è un tema di grande rilevanza strategica, civile, economica e democratica per lo sviluppo del Paese, per la crescita dei popoli e per la stessa missione del sistema universitario nazionale.
Tale tema è dibattuto non solo nella realtà italiana, ma nella comunità scientifica internazionale, per superare le sfide culturali e sociali oggi presenti.
In tale contesto, la comunità pedagogica italiana è chiamata a discutere sul futuro della ricerca scientifica, le sue ragioni e i suoi temi, nella direzione di nuovi e auspicabili collegamenti fra sedi, gruppi e ambiti, al di qua e al di là di ogni possibile confine geografico e culturale. Dove il "caso" delle riviste e il nodo, ancora aperto, del rapporto quantitativo e qualitativo tra le monografie e gli articoli, rivestono un ruolo centrale e da approfondire anche in vista del varo dell'Agenzia di Valutazione Nazionale della Ricerca.
Come ha rilevato il dibattito in ambito internazionale già avviato da tempo, la questione si presenta alquanto complessa per l'area umanistica in generale, e quella pedagogica in specie, sia per le obiettive difficoltà della "materia", sia per la mancanza di una tradizione consolidata al riguardo, non tanto in Italia, di cui gli indicatori o i parametri per l'esercizio della VQR 2004-2008 (Valutazione Quinquennale della Ricerca) costituiscono, già al presente, un forte richiamo a un cambiamento dei piani d'azione, dei metodi e degli stili
Collagen orientation in compact bone: I. A new method for the determination of the proportion of collagen parallel to the plane of compact bone sections
No full text[No abstract available
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