1,720,999 research outputs found
Protezione e conservazione. Rapporto con la preesistenza, caratterizzazione costruttiva, invecchiamento ed efficacia delle coperture nell'area archeologica di Ostia antica
No full textLa presente tesi di dottorato indaga le coperture protettive dei siti archeologici come soluzioni per la loro conservazione in situ, analizzando casi studio e prospettive metodologiche all'interno del contesto mediterraneo e approfondendo il caso del Parco archeologico di Ostia antica.
Attraverso una panoramica storica e un’analisi dello stato dell’arte, viene affrontata l’evoluzione delle pratiche di copertura e i diversi approcci conservativi che hanno influenzato il modo in cui i resti archeologici sono stati protetti e resi fruibili. Il Parco di Ostia antica, sito estensivo e costruttivamente omogeneo di cui è stata adeguatamente restituita la vicenda edificatoria, di scavo e di sistemazione moderna e che presenta un palinsesto di soluzioni variegato e stratificato nel tempo, ha rappresentato un caso studio ideale per approfondire il tema sotto diversi aspetti. È stato infatti possibile studiare l’efficacia delle coperture a livello tecnico, percettivo e gestionale, analizzando i materiali, le geometrie e l’impatto delle strutture sul contesto storico-paesaggistico e sulla materia dei beni archeologici.
La tesi propone un approccio multidisciplinare, sottolineando la necessità di una pianificazione preventiva per
assicurare che le coperture rispondano pienamente alle esigenze di conservazione del sito. La ricerca cerca di giungere a un’integrazione tra le valutazioni tecniche dei dispositivi messi in opera e una disamina sulle relazioni formali che questi interventi hanno determinato, per fornire uno strumento adatto su cui fondare un adeguato piano di manutenzione delle coperture nell’area archeologica ostiense
Ceppo di lievito utilizzabile per ridurre la quantità di acrilammide in un alimento trattato termicamente
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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
Production of volatile organic compounds from Aureobasidium pullulans strains as a mechanism of action against postharvest pathogens
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Effect of Aureobasidium pullulans strains against Botrytis cinerea on kiwifruit during storage and on fruit nutritional composition
Full text linkKiwifruit, wounded at the equator or by pedicel removal, to simulate the stem end wound, were treated with Aureobasidium pullulans (L1 and L8 strains) and subsequently inoculated with conidia of Botrytis cinerea. Fruits were stored at -1 °C in normal refrigeration (NR) or in controlled atmosphere (CA) (2% O2; 4.5% CO2). After 4 months, both antagonists significantly reduced the disease in all experiments, L1 better than L8. In NR, their efficacy was higher than 80%. In CA, the disease reduction was lower: between 30% (L1) and 60% (L8). The ability of both strains to compete with the pathogen for nutrients was tested in kiwifruit juice (0.5%) by in vitro experiments. Antagonists significantly reduced pathogen conidia germination in water and in juice. An HPLC analysis was performed to define the amino acid composition of kiwifruit juice upon L1 and L8 treatment. L1 and L8 greatly increased the concentration of both glutamic and aspartic acids and stimulated the production of new amino acids, although at low concentrations. Each amino acid displayed an antifungal effect against mycelium growth of B. cinerea. Finally, L1 and L8, cold tolerant and active strains in CA, can be effectively applied to control the stem end rot of kiwifruit in long storage
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