1,720,960 research outputs found
La città inquieta. Note introduttive a un nuovo libro su Selinunte
No full textLa documentazione epigrafica di Selinunte (Lex sacra e defixiones) sono efficace testimonianza delle dinamiche politiche, sociali e culturali della città; il culto e i rituali religiosi sono presi in esame anche alla luce della tradizione letteraria e del più ampio tema della valorizzazione del patrimonio cultural
Design and experimental characterization of a solar cooker with a prismatic cooking chamber and adjustable panel reflectors
Get PDFIn this work, a novel solar cooker with the cooking chamber shaped like a Newton prism was designed, constructed and tested. The device is characterized by ease of construction, use and transportation. It is made of common and inexpensive materials. The proposed cooker is able to track the sun during its use through wheels placed at its base and a manual system to vary the inclination of the reflective surfaces. Experimental tests were carried out to characterize its thermal and optical performances and evaluate the wind's influence. In particular, two identical prototypes, one shielded from the wind and the other not, were simultaneously tested by tracking the reflective surfaces at optimal angles. Several tests were carried out without and with a load using water and glycerin as test fluids. The results showed that the solar cookers have good thermal performance even at medium-high temperatures. Both prototypes reached a stagnation temperature of about 137 °C. The shielded cooker usually brought 2 kg of water from 40 °C up to 90 °C in about two hours and 2 kg of glycerin from 40 °C up to 110 °C in less than three hours. These times were slightly longer for the unshielded prototyp
Diventare un dio a Selinunte? Empedocle e la bonifica/purificazione della città
No full textL'articolo esamina la plausibilità storica del culto divino tributato ad Empedocle a Selinunte, così come è tràdito in un isolato passo di Diogene Laerzio. Attraverso un esame di tutte le fonti letterarie, numismatiche ed epigrafiche si ricostruisce il quadro storico-religioso di Agrigento e di Selinunte nel V secolo a.C
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Experimental characterization of a foldable solar cooker with a trapezoidal cooking chamber and adjustable reflectors
Get PDFIn this study, a portable and easy-to-construct solar cooker is presented as an alternative to traditional cooking methods to be used in humanitarian contexts in order to face the issue of humanitarian goods transport and storage. The prototype consists of a trapezoidal cooking chamber and adjustable reflector panels made of inexpensive and readily available materials. The solar cooker was designed to be foldable and transportable by using lightweight materials. In fact, the folded prototype is compact, having a mass of 7 kg. The thermal performance and optical performance of the proposed cooking appliance were evaluated through several experiments conducted without load and with load. The tests were done by using a black pot enclosed with a glass bowl or a plastic bag. During the tests without load, the highest recorded temperature was 149.38 °C. The time needed to bring 1 kg of water from 40 °C until 90 °C was on average 114 min for the glass enclosure tests and 132 min for the plastic enclosure tests. The prototype loaded with 1 kg of glycerin took the same average time of 121 min to reach 105 °C from 40 °C for both glass and plastic enclosure tests. The average values of cooking power, derived using Hottel-Whillier-Bliss formulation with a reference global normal solar irradiance for the clear sky condition, are estimated as 26.0 W for the water tests using the glass enclosure and 31.8 W for the glycerin tests with the glass enclosure. Finally, the cooking performance of the prototype was evaluated by cooking common foods (i.e., tomatoes, rice, potatoes). The average cooking times for tomatoes, rice, and potatoes were always lower than two hours, a value consistent with the cooking times of different box solar cookers
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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