271 research outputs found
Dall?invenzione al modello: l?esperienza teatrale all?epoca di Dosso
No full textPrendendo come modello di osservazione l'attività artistica di Dosso Dossi, il lavoro del pittore ferrarese viene inserito nel più ampio quadro della cultura di spettacolo della sua epoca. Analizzando la produzione artistica in maniera molteplice e alla luce dei rapporti tra figurazione pittorica e figurazione teatrale (secondo metodi di indagine consolidati), da molti esempi del lavoro di Dosso emerge una evidenza "spettacolare" che rompe la categoria convenzionale dei generi. Il rapporto tra visione teatrale e pittura evidenzia ancora una volta come non vi sia separazione tra le diverse esperienze tra Quattro e Cinquecento, ma come le due pratiche si intreccino in un quadro complessivo in grado di definire la mentalità di un'epoca. Sotto questo aspetto ne trae vantaggio la stessa indagine artistica, più facilmente collegabile alla dimensione sociale e materiale, anzichè essere relegata nella semplice categoria delle estetiche
Data credit distribution through lineage
No full textData are a fundamental asset in the current world of research. Data citation is becoming more common and supported by research databases, but it still presents many research challenges. This paper describes Data Credit, a new measure of value for data derived from data citation, that enables us to annotate databases with real values representing their importance. Credit, computed through the citations, can be used alongside them to better understand the importance of data. We introduce the task of Data Credit Distribution, the process by which credit produced by a citation is and assigned to the data in a database responsible for producing the output information being cited. We describe how this process can be performed and, through experiments, we show that credit can serve, among other things, to highlight “hotspots” in the database
Dosso di Garda
No full textSulla sommità del Dosso di Garda sono stati documentati resti di murature, tegole, frammenti di ceramica e frammenti di bronzo, che delineano un contesto insediativo risalente probabilmente alla metà del XIII secolo, come riscontrato nelle fonti documentarie
Credit distribution in relational scientific databases
No full textDigital data is a basic form of research product for which citation, and the generation of credit or recognition for authors, are still not well understood. The notion of data credit has therefore recently emerged as a new measure, defined and based on data citation groundwork. Data credit is a real value representing the importance of data cited by a research entity. We can use credit to annotate data contained in a curated scientific database and then as a proxy of the significance and impact of that data in the research world. It is a method that, together with citations, helps recognize the value of data and its creators. In this paper, we explore the problem of Data Credit Distribution, the process by which credit is distributed to the database parts responsible for producing data being cited by a research entity. We adopt as use case the IUPHAR/BPS Guide to Pharmacology (GtoPdb), a widely-used curated scientific relational database. We focus on Select-Project-Join (SPJ) queries under bag semantics, and we define three distribution strategies based on how-provenance, responsibility, and the Shapley value. Using these distribution strategies, we show how credit can highlight frequently used database areas and how it can be used as a new bibliometric measure for data and their curators. In particular, credit rewards data and authors based on their research impact, not only on the citation count. We also show how these distribution strategies vary in their sensitivity to the role of an input tuple in the generation of the output data and reward input tuples differently
Can We Measure the Impact of a Database?
No full textDatabases publish data. This is undoubtedly the case for scientific and statistical databases, which have largely replaced traditional reference works. Database and Web technologies have led to an explosion in the number of databases that support scientific research, for obvious reasons: Databases provide faster communication of knowledge, hold larger volumes of data, are more easily searched, and are both human- and machine-readable. Moreover, they can be developed rapidly and collaboratively by a mixture of researchers and curators. For example, more than 1,500 curated databases are relevant to molecular biology alone. The value of these databases lies not only in the data they present but also in how they organize that data.
In the case of an author or journal, most bibliometric measures are obtained from citations to an associated set of publications. There are typically many ways of decomposing a database into publications, so we might use its organization to guide our choice of decompositions. We will show that when the database has a hierarchical structure, there is a natural extension of the h-index that works on this hierarchy
NanoWeb: Search, access and explore life science nanopublications on the web
No full textNanopublications are scientific statements represented in the Resource Description Framework (RDF), a brief machine-readable form representing data. Nanopublications consist of scientific facts extracted from the literature and contextualized with provenance and attribution information. Nanopublications are designed to enhance knowledge spreading, support the re-use of scientific facts, and provide credit to the corresponding authors. Despite these promising features, nanopublications are not widely adopted, and their use is still quite limited to experts. We believe this is partly due to the lack of services for searching, retrieving, and understanding nanopublications. To mitigate this, we propose NanoWeb, a Web-based system designed to allow general users to search, access, explore, and re-use nanopublications publicly available on the Web. Currently, NanoWeb is tailored for the life science domain, where plenty of nanopublications are available
Phenols as Novel Photocatalytic Platforms for Organic Synthesis
No full textIn recent years, organic chemists have devoted a great deal of effort towards the implementation of novel green photocatalytic synthetic protocols. To this end, the development of new effective, non-toxic, inexpensive photocatalysts, which are capable of driving value-added chemical transformations, is highly desirable. Interestingly, phenols fulfill all these requirements due to their outstanding physicochemical features, therefore emerging as promising metal-free photocatalytic platforms for organic synthesis. This Perspective aims at highlighting the most recent applications of phenols in organic photocatalysis. More specifically, phenolate anions, formed upon deprotonation of phenols, are photo-active organic intermediates that may absorb light within the visible region. Thus, when in the excited states, these anions may be used as reductants to generate reactive open shell species from suitable precursors under mild operative conditions. Alternatively, phenolate anions and suitable radical precursors can form electron donor-acceptor (EDA) complexes. Specifically, the photochemical activity of these molecular aggregates can be used to initiate organic radical reactions. Lastly, forward-looking opportunities within this research field have been discussed
Stress Induced Leakage Current dependence on frequency after voltage pulsed stress
No full textStress Induced Leakage Current (SILC) is one of the major problems found in ultra-thin oxides before the onset of soft or catastrophic breakdown during accelerated life tests. Quite often SILC is measured after constant current (CCS) or constant voltage (CVS) stresses, even though during the device life the operating conditions usually involve alternating, non-constant gate bias. Relatively few works are focused on this point [1]; the present contribution is one of the first addressing the problem of SILC produced by Pulsed Voltage Stress (PVS). Results have been compared with those obtained after CVS, as a function of injected charge and pulse frequency. We have also studied Radiation Induced Leakage Current (RILC) with either pulsed or constant bias voltage applied during irradiation
Data citation and the citation graph
No full textThe citation graph is a computational artifact that is widely used to represent the domain of published literature. It represents connections between published works, such as citations and authorship. Among other things, the graph supports the computation of bibliometric measures such as h-indexes and impact factors. There is now an increasing demand that we should treat the publication of data in the same way that we treat conventional publications. In particular, we should cite data for the same reasons that we cite other publications. In this paper we discuss what is needed for the citation graph to represent data citation. We identify two challenges: to model the evolution of credit appropriately (through references) over time and to model data citation not only to a data set treated as a single object but also to parts of it. We describe an extension of the current citation graph model that addresses these challenges. It is built on two central concepts: citable units and reference subsumption. We discuss how this extension would enable data citation to be represented within the citation graph and how it allows for improvements in current practices for bibliometric computations, both for scientific publications and for data
Photoinduced Cascade Reactions of 2-Allylphenol Derivatives toward the Production of 2,3-Dihydrobenzofurans
No full textA light-driven protocol for the synthesis of 2,3-dihydrobenzofurans under mild conditions is reported. Specifically, the cascade process is initiated by the photochemical activity of allyl-functionalized phenolate anions, generated in situ upon deprotonation of the corresponding phenols. The reaction proceeds rapidly with reaction times as low as 35 min, delivering a wide range of densely functionalized products (20 examples, yields up to 69%). Mechanistic studies have also been performed providing convincing evidence for the photochemical formation of carbon-centered radical species. A cascade reaction pathway involving a tandem atom transfer radical addition (ATRA) and an intramolecular nucleophilic substitution (SN) process is proposed to occur
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