1,720,963 research outputs found
Acquisizione ed analisi dei carichi di esercizio su pattini in linea da competizione
Full text linkScopo del lavoro era la misura dei carichi di esercizio agenti sul carrello di pattini in linea da competizione, fondamentali per una corretta progettazione a rigidezza e durata del carrello e per una valutazione biomeccanica della tecnica di pattinata. Per la misura dei carichi di pattinata si sono direttamente strumentati gli archetti del carrello di serie ottenendo informazioni sui carichi agenti su ciascuna ruota. Si sono creati per ciascun carrello 8 ponti interi estensimetrici in modo da misurare su ciascuna ruota la forza verticale FZ e la forza laterale FY, tramite un acquisitore portatile Somat 2300 posizionato sullo zaino dell’atleta. Il carrello è stato tarato ruota per ruota in Z e Y con una macchina servoidraulica ed una pedana dinamometrica: le prove in pista sono state svolte da un atleta professionista. I dati rilevati hanno consentito la valutazione dei carichi complessivi e dei carichi alla singola ruota dei pattini interni ed esterni, nonchè lo studio della tecnica di pattinata
Existence and Interior Regularity Theorems for ∂ ̄ on Q-Convex Domains
No full textWe establish for a q-convex domain Ω ⊂ Cn existence results in Lp,k-12(Ω,loc) and Cp,k-1∞(Ω) for the equation ∂ ̄ u= f, where f is a (p, k)-form on Ω of degree k≥ q such that ∂ ̄ f= 0
Sviluppo di sci estensimetrati per la rilevazione in pista delle sollecitazioni su sci da competizione
Full text linkAim of the work was the development of a pair of strain gauged skis suitable for strain measurement during real courses in a snow field: this would enable to measure the distribution of bending and twisting moments acting along the ski during real events. Two racing skis were used and 11 couples of unidirectional strain gauges were symmetrically applied to the top foil of the skis, at 11 sections regularly distributed along the ski: a total number of 22 quarter bridge strain channels were eventually applied to each ski.
The ski were calibrated during laboratory tests under different bending and torsion test conditions, in order to evaluate the calibration constants correlating the bending and twisting applied moments and the strain signals. The stiffness properties in bending and torsion of different sections along the ski were evaluated both by optical and contact methods, in order to have all information needed to estimate the ski instantaneous deflected shape on the basis of the bending and twisting moment diagrams collected from the field data acquisitions in slalom. Pilot tests performed on a slalom course with giant and special slalom poles confirmed the reliability of the developed skis and allowed to obtain the bending and torsion diagrams at each sections during the courses
ON THE EKELAND-HOFER SYMPLECTIC CAPACITIES OF THE REAL BIDISC
Full text linkIn C-2 with the standard symplectic structure we consider the bidisc D-2 x D-2 constructed as the product of two open real discs of radius 1. We compute explicit values for the first, second and third Ekeland-Hofer symplectic capacity of D-2 x D-2. We discuss some applications to questions of symplectic rigidity
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
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