1,721,197 research outputs found
Le tecnologie meccaniche ambientalmente compatibili per l’estrazione dei minerali
No full textI metodi di separazione fisici consentono di estrarre dalle rocce i minerali necessari all’industria ed in particolare all’industria “high tech” e a quelle che operano per la conversione ecologica. I rifiuti industriali e soprattutto i minerari ospitano minerali che contengono inquinanti che se estratti possono soddisfare le esigenze di approvvigionamento dell’industria, ma anche di procedere alla riqualificazione ambientale delle loro aree di stoccaggio. I materiali sterili una volta privati dai minerali e metalli di interesse minerario perdono il loro carico inquinante e possono essere reimpiegati sia a fini industriali (ad es. feldspati e quarzo) sia come aggreganti nell’edilizia. Il miglioramento tecnologico nelle
strategie di separazione consente di applicare in cave e miniere i principi di economia circolare, non a caso oggi si tende a estrarre i minerali di interesse anche dai rifiuti stoccati nelle discariche delle ex aree estrattive, che per motivi tecnologici nel passato sono stati stoccati nonostante le elevate concentrazioni di risorse. Questa strategia, fortemente incoraggiata dalla UE, consente di recuperare suolo e di agire su prodotti già in pezzatura utile per la loro ottimizzazione ai fini estrattivi. Questo settore è in espansione in quanto l’Europa sta promuovendo piani di autosufficienza nell’approvvigionamento delle risorse minerarie con particolare attenzione alle risorse strategich
Art CSI: When Science Solves the Puzzle of Forgery. The Case Study “Vase of Flowers" , Painting Attributed to Filippo De Pisis (1896-1956)
No full textThe talk shows the results of studies carried out on Vase of Flowers, painting attributed to Filippo De Pisis (1896-1956), renowned Italian artist, underscoring the importance of modern science in revealing some of the misconceptions provided by a not in-depth pigments analysis. The researches on detailed pigment analysis, studying dating pigments, allowed to support dating studies and artistic attribution
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
Recycling of ornamental stone scraps through gravity and magnetic methodologies: the case study of Buddusò Quarrying District (Northern Sardinia, Italy) - Part II
No full textAtmospheric and Soil Methane concentrations at a Natural Gas Storage Site
No full textCities are major contributors to greenhouse gas emissions due to a high density of urbanization, numerous industrial centers, concentrated breeding of chickens, pigs and intensive agricultural activity. These anthropic GHG sources overlap to the endogenous sources of methane related to peat degradation hosted in the test site, Pliocene and Holocene sediments or to dispersion from buried methane deposits that characterize the outermost, NE-verging fronts of the Northern Apennines. Demonstrative activities were carried out in an area with a high density of abandoned wells used before 1962 for the extraction of methane, whose emission contributions are currently unknown. Air quality monitoring and soil gas monitoring system for methane and radon gas, at 10cm and 1m depth was the main purpose of this paper. Measurements have been taken for radon concentrations with a Durridge RAD7 Company, Inc., USA instrument. It was used for atmosphere and soil gas monitoring system three Biogas ETG (Etg Risorse e Tecnologia, Italy) instruments, with a nondispersive infrared sensor (NDIR) CH4 gas sensor. The measurements started in March 2016 and continued in July-August-September 2016, to determine methane and radon gas concentrations, their distribution and to understand the relationship among gases and atmospheric conditions. What distinguishes this study from those conducted at other gas storage site is the methodology used, the monitoring system was done in the same time in the atmosphere and at different depths into the soil (10 cm and 1m depth) to understand the differences of methane gas concentration between atmosphere and soil
Recycling of ornamental stone scraps through gravity and magnetic methodologies: the case study of Buddusò Quarrying District (Northern Sardinia, Italy) - Part I
No full textDispelling 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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