1,721,048 research outputs found
Diversità colturale e produttività dei cereali nell'Italia meridionale: un'analisi di media-varianza
No full textLa sostenibilità del turismo garganico tra profitto e vincoli ambientali: un modello multidimensionale di calcolo della CCT
No full textFinite Element Study on Stability in the Femoral Neck and Head Connection to Varying Geometric Parameters with the Relates Implications on the Effect of Wear
No full textTotal hip arthroplasty (THA) is a common surgical procedure used to treat hip osteoarthritis and other joint conditions that cause pain and functional limitation. Traditionally, THA has been performed most often in elderly patients, but in recent years, there has been an increase in hip arthroplasties in young patients. Femoral prosthesis rupture is a rare but significant complication that can also occur in young patients undergoing total hip arthroplasty (THA). Some of the factors that can contribute to femoral prosthesis ruptures include abnormal overload, defects in the design, lack of geometric fit, and type of materials used in the stem and femoral head connection. The aim of this study is to analyze the criticalities in the contact between the femoral head and the stem neck. In particular, two types of contacts will be taken into consideration: proximal and distal, and through the finite element method (FEA), the criticalities will be defined. The results show that in the proximal contact, the stress levels exceeded 500 MPa in certain areas of the prosthesis. This stress could potentially lead to structural failure, such as rupture or deformation of the prosthesis. In addition, to prevent bacterial infiltration or debris from the outside, the distal connection is recommended
Il calcolo del deflusso minimo vitale su base biologica mediante l’utilizzo di un modello idraulico monodimensionale
Full text linkIl presente lavoro illustra una metodologia per la stima del Deflusso Minimo Vitale alla scala di bacino mediante l’applicazione di un’indagine sperimentale su base biologica. Ad esclusione dei metodi basati esclusivamente su criteri idrologico-idraulici e morfologici, i quali risultano facilmente applicabili per il reticolo idrografico di comprensori vasti, una valutazione del DMV basata su dati rilevati in situ risente
della limitazione di applicabilità spaziale dovuta ai tempi e ai costi delle campagne di misura. Applicando un modello idraulico per la valutazione delle variabili idrauliche e utilizzando informazioni spazialmente distribuite relative all’ittiofauna, elemento principe del metodo utilizzato, quanto proposto consente di ottenere la stima della portata ottimale per le aste fluviali indagate. Tale valore è stato quindi oggetto di un confronto con i dati di Q7,2, primo valore di riferimento, mediante un’opportuna funzione, per l’individuazione del Deflusso Minimo Vitale
Indigenous peoples' land rights and agricultural expansion in Latin America: A dynamic panel data approach
No full textAgricultural expansion remains an important cause of deforestation in Latin America. There is an on-going debate about whether increasing agricultural productivity leads to land-sparing or Jevons paradox. At the same time, recognizing the customary rights of indigenous peoples and local communities can be particularly effective at slowing down deforestation. We consider ten Latin American countries over the period 1990 to 2010 and use dynamic panel data models to assess whether: a) there is a difference between short-run and long-run effects of improvements in agricultural productivity and b) different land tenure systems are capable of directing the process of agricultural intensification towards land-sparing. Our results allow us to draw a number of stylised conclusions. In general, we observe that higher agricultural productivity per-se is land-sparing, albeit the long-run effects appear smaller than the short-run effects. Most importantly, the overall effect of increased productivity crucially depends on the institutional context. In this respect, increasing the forest area owned or managed by indigenous peoples promotes land-sparing, while increasing the forest area administered by governments and/or owned by private individuals and companies promotes Jevons paradox. In the long-run, the agricultural expansion effects of increasing the forest areas owned by private individuals and companies are stronger than those associated with the expansion of forest areas administered by the government. We also note that the formal recognition of land ownership to indigenous peoples and local communities manifests its beneficial effects in the long-run
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
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