1,720,959 research outputs found
Critical examination on the role of surgery in the treatment of morbid obesity [REVISIONE CRITICA SUL RUOLO DELLA CHIRURGIA NELLA TERAPIA DELLA GRANDE OBESITA'. 10 ANNI DI ESPERIENZA PERSONALE]
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Modeling and Analysis of BESS Operations in Electricity Markets: Prediction and Strategies for Day-Ahead and Continuous Intra-Day Markets
No full textIn recent years, the global energy sector has seen significant transformation, particularly in Europe, with a notable increase in intermittent renewable energy integration. Italy and the European Union (EU) have been among the leaders in this transition, with renewables playing a substantial role in electricity generation as of the mid-2020s. The adoption of Battery Energy Storage Systems (BESS) has become crucial for enhancing grid efficiency, sustainability, and reliability by addressing intermittent renewable sources. This paper investigates the feasibility and economic viability of batteries in wholesale electricity markets as per EU regulation, focusing on the dynamics of very different markets, namely the Day-Ahead Market (DAM) based on system marginal price and the Cross-Border Intra-day Market (XBID) based on continuous trading. A novel model is proposed to enhance BESS operations, leveraging price arbitrage strategies based on zonal price predictions, levelized cost of storage (LCOS), and uncertain bid acceptance in continuous trading. Machine learning and deep learning techniques are applied for price forecasting and bid acceptance prediction, respectively. This study finds that data-driven techniques outperform reference models in price forecasting and bid acceptance prediction (+7-14% accuracy). Regarding market dynamics, this study reveals higher competitiveness in the continuous market compared to the DAM, particularly with increased risk factors in bids leading to higher profits. This research provides insights into compatibility between continuous markets and BESS, showing substantial improvements in economic profitability and the correlation between risk and profits in the bidding strategy (EUR +9 M yearly revenues are obtained with strategic behavior that reduces awarded energy by 60%)
Tissue expansion in neurosurgical reconstructive technique: case report
No full textBACKGROUND Various reconstructive techniques using hair-bearing scalp to manage unsightly scalp defects have been described in 1983 Fonseca and in 1984. Horowits emphasized the use of galeal-pericranial flaps in scalp wounds with exposed bone in 1986. Matthews and Missoten described early tissue expansion to close a traumatic defect of the scalp, and in 1990 Kiyono placed tissue expander in a pocket adjacent to the defect that was covered with Martex Mesh. METHODS The authors present a case of 23-year-old man with a scalp lacetation over a depressed fracture of the skull and a dural tear, after a traffic accident. The repair procedures at another hospital failed, resulting in an area of scalp necrosis with a cerebrospinal fluid (CSF) leak. At our observation, the reconstructive technique using hair-bearing scalp with tissue expander was performed to managed unsightly scalp necrosis. Moreover the neurosurgical treatment was necessary to avoid the complications of the CSF leak. CONCLUSIONS A 9-year review showed more than 40 patients treated by this technique that allows a pericranial flap of every size. When scalp defects are too large, the tissue expander allows good aesthetic results. © 1995
Tissue expansion in neurosurgical reconstructive technique: case report
No full textBACKGROUND: Various reconstructive techniques using hair-bearing scalp to manage unsightly scalp defects have been described. In 1983, Fonseca and in 1984, Horowitz emphasized the use of galeal-pericranial flaps in scalp wounds with exposed bone. In 1986, Matthews and Missoten described early tissue expansion to close a traumatic defect of the scalp, and in 1990 Kiyono placed tissue expander in a pocket adjacent to the defect that was covered with Marlex Mesh.
METHODS: The authors present a case of 23-year-old man with a scalp laceration over a depressed fracture of the skull and a dural tear, after a traffic accident. The repair procedures at another hospital failed, resulting in an area of scalp necrosis with a cerebrospinal fluid (CSF) leak. At our observation, the reconstructive technique using hair-bearing scalp with tissue expander was performed to manage unsightly scalp necrosis. Moreover the neurosurgical treatment was necessary to avoid the complications of the CSF leak.
CONCLUSIONS: A 9-year review showed more than 40 patients treated by this technique that allows a pericranial flap of every size. When scalp defects are too large, the tissue expander allows good aesthetic results
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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