1,721,381 research outputs found
Optimal Site for Proximal Optimization Technique in Complex Coronary Bifurcation Stenting: A Computational Fluid Dynamics Study
Full text linkBackground/purpose: The optimal position of the balloon distal radio-opaque marker during the post optimization technique (POT) remains debated. We analyzed three potential different balloon positions for the final POT in two different two-stenting techniques, to compare the hemodynamic effects in terms of wall shear stress (WSS) in patients with complex left main (LM) coronary bifurcation. Methods/materials: We reconstructed the patient-specific coronary bifurcation anatomy using the coronary computed tomography angiography (CCTA) data of 8 consecutive patients (6 males, mean age 68.2± 18.6 years) affected by complex LM bifurcation disease. Subsequently a virtual bench test was performed in each patient using two different double stenting techniques represented by the DK and Nano crush using the reconstruction of Orsiro stents (Biotronik IC, Bulack, Switzerland). Results: A significant reduction in the mean WSS values in all the lesion's sites was observed when the final POT was performed 1 mm distally the carina cut plane in both techniques. Moreover, a significant improvement in the mean WSS values of the entire SB (e.g. LCX) was obtained performing the POT 1 mm distally to the carina cut plane. The proximal POT resulted in larger area of lower WSS values at the carina using both the Nano crush and the DK crush techniques. Conclusions: In patients with complex LM bifurcation disease the use of a final POT performed 1 mm distally to the carina cut plane might results in more favorable WSS patterns (i.e. higher WSS values) along all stented segments and, especially, along the entire LCX lesions
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 giardino fitoalimurgico per la valorizzazione delle specie spontanee
No full textL’utilizzo alimentare delle piante spontanee è stato definito fitoalimurgia. Il termine “alimurgia” è stato coniato da Giovanni Targioni-Tozzetti nel 1767 per indicare lo studio delle soluzioni da ricercare in caso di urgenza alimentare (alimenta urgentia = alimurgia)”: l’alimurgia è quindi “la disciplina che si occupa di ricercare quanto può essere utile nel caso di necessità alimentare”. Questo termine è stato riproposto più recentemente da Oreste Mattirolo nel 1918, con l’aggiunta del prefisso “fito” che rende il termine più preciso e ne definisce meglio il campo di interesse. Il termine in ogni caso al momento non è riportato nei dizionari della lingua italiana.
Su proposta del Dipartimento di Agronomia Ambientale e Produzioni Vegetali (DAAPV) dell’Università di Padova e dell’Istituto di Biologia Agroambientale e Forestale del CNR (CNR-IBAF), la Regione Veneto ha finanziato il progetto di allestire tre giardini fitoalimurgici dove raccogliere gran parte delle piante alimurgiche usate in regione; il progetto prevede anche la raccolta e l’organizzazione dei saperi collegati a dette piante (tradizioni, ricette...) da eseguire in gran parte con un approccio etnologico
La previsione delle emergenze ed il controllo delle piante infestanti dei tappeti erbosi
No full textAlertInf: emergence predictive model for weed control in maize in Veneto
No full textWeed control is one of the most important management practices in maize production. Weed time of emergence influences the weed-crop competition, determining the level of damage that the infestation may cause to crop yield. The ability to predict weed emergences can help to optimize control timing, increasing the efficacy of both chemical and mechanical methods and consequently reducing herbicide use. The Department of Environmental Agronomy and Crop Science of the University of Padova has developed the AlertInf model, which provides the percentage of emergence reached by a given weed species in real time using meteorological data, such as soil temperature and rainfall. The Agrobiometeorology Unit of ARPA Veneto has organized an interactive support service using the AlertInf model on their webpage www.arpa.veneto.it/upload_teolo/agrometeo/infestanti.htm to help farmers in planning weed control
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