1,721,003 research outputs found
Vorticity fluctuation in the LES of the channel flow through new wall condition and the noncommutation error procedure.
No full textELECTRICITY GENERATION FROM WAVE POWER IN THE TYRRENIAN SEA
Full text linkThe cost of the energy extracted by ocean surface waves depends on many technological-physical factors like conversion principle, wave energy potential, water depth, shore distance, and ocean floor haracteristics. Economic factors, like assumed discount rate, cost reduction due to technological improvement and fiscal incentives, are extremely important too. The Tyrrhenian Sea, possesses an interesting energy potential. At some locations offshore Sardinia and Sicily the annual mean wave power per unit of wave front length is of the order of 10kW/m. In this paper the energy production has been computed for two different wave energy converters (AquaBuOY and Pelamis), at two promising locations in the western Italian seas. The energy cost has also been computed at Alghero and Mazara sites, which have the highest wave energy potential. The results indicate that the existing device converters are oversized with respect to the typical wavelength of the investigated sites. After proper scaling of the device, the performance in the energy conversion could become economically attractive also for Italian seas
Wave forces on solid and perforated caisson breakwaters: comparison of field and laboratory measurements
No full textGoing 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
Endoscopic diagnosis and therapy of gastro-esophageal varices
No full textEndoscopic examination has a primary role in diagnosis and elective or emergency treatment of esophago-gastric varices. NIEC score has proved to be particulary useful to predict bleeding incidence within a year in a cirrhotic patient presenting esophageal varices. For gastric varices, at present, there is not any international agreement for an endoscopic classification defining haemorrhagic risk. Emergency sclerotherapy is particularly effective in controlling variceal bleeding (over 95% of success). Then, when available, it must be performed as soon as possible. Non controlled non randomized trials have shown that Cyanoacrylate (Histoacryl) intravariceal injections are very useful in treatment of large esophageal varices and gastric ones, both in immediate and delayed emergency. Anyway the technique is complex and presents some complications for instruments and accessories. Esophageal varices band ligation is a new method that probably is going to replace sclerotherapy. It has a lower incidence of complications and shortens the times needed for eradication. For these reasons this technique should be evaluated in RCTs versus pharmacological treatment in prophylaxis of first bleeding
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
- …
