1,721,079 research outputs found
ReZinCo: Innovazione nel Riciclo Polveri FEA
No full textIl progetto ReZinCo, acronimo inglese di “Riciclo di Zinco come Coating”, punta a valorizzare un rifiuto pericoloso, ricco in Zn, derivante dai forni elettrici ad arco (FEA) impiegati nelle acciaierie, proponendo un’innovazione tecnologica e di prodotto nel campo della galvanica. In quest’ottica, il progetto prevede un ciclo integrato che partendo da rottami di acciaio galvanizzato produce direttamente nuovo acciaio galvanizzato (economia rigenerativa).The project ReZinCo, standing for “Recycling of Zinc as Coating”, aims to enhance a hazardous Zn-rich waste resulting by electric arc furnaces (EAFs) of steel making industry by proposing a technological and product innovation in galvanizing. In doing so, the project provides an integrated cycle that, fed with galvanized scrap, produces directly new finished galvanized steel products (complying with regenerative economy)
C. Mouchet et S. A. Radaelli, Los derechos del escritor y del a.rtista
No full textC. Mouchet et S. A. Radaelli, Los derechos del escritor y del a.rtista. In: Revue internationale de droit comparé. Vol. 7 N°2, Avril-juin 1955. p. 460
Expression of HIV-1 envelope gene by recombinant avipox viruses
No full textRecombinant canarypox (CP) and fowlpox (FP) viruses that contained two forms of the HIV-1 (SF2 strain) env gene were engineered and their expression analysed in chick, simian and human cells. These vectors can efficiently replicate in avian but not in mammalian cells, in which infection is abortive. The two forms, consisting of the entire env open reading frame (IS+) or of the same gene lacking the putative immunosuppressive (IS-) region (amino acids 583-599), were individually inserted into the two virus vector backgrounds. In order to avoid premature transcription termination of the foreign gene and to improve protein expression, a mutagenesis was also performed within the T5NT motif without altering the amino acid sequence. By immunoprecipitation analyses, cells infected with CP and FP recombinants expressed HIV-1 env polypeptides of the appropriate molecular weight. We observed that the gp160 precursor was proteolytically cleaved except in MRC-5 cells infected with the IS- recombinants and that these polypeptides were glycosylated. Further analysis of these recombinant viruses by indirect immunofluorescence and syncytia inhibition assays indicated that the gp120 gp41 complex was present on the surface of infected cells, the number of syncytia being significantly lower when cells were infected by the CPIS- or FPIS- recombinants. Moreover, sera of immunized rabbits revealed the presence of specific antibodies in animals inoculated either with CP or with FP recombinants. These new constructs, which are unable to support a productive infection in human cells, might therefore also be a good anti-HIV-1 candidate vaccine in seropositive hosts
Cathodic Plasma Electrolysis : from Surface Pre-Treatment of Metals to Galvanizing
Full text linkCathodic Plasma Electrolysis (CPE) is an electrochemical technique that, while working at atmospheric pressure and temperature, generates at the electrode surface a thin sheath of plasma (Fig.1a) that assures peculiar properties to the treated sample. Unlike the more well-known analogous anodic process (plasma electrolytic oxidation, PEO), also used at an industrial level for growing oxide layers on metal substrates, CPE is still almost at the beginning from a strictly scientific standpoint, with applications ranging from surface cleaning/pre-treatment to coating deposition [1].
Even if peculiar properties of the zinc deposit have been already reported [1], the CPE technology was launched on the market by only one company (CAP Technologies; USA). Combining the Regenerative and Circular Economy vision with the real needs of steelmaking companies, our research group has started a feasibility study aimed at using CPE for galvanizing secondary steel using Zn-containing aqueous solutions resulting from the leaching of electric arc furnace (EAF) dust that is a waste resulting from the production of secondary steel from galvanized scrap.
In the present talk, some preliminary lab-scale data will be discussed concerning the employment of CPE for both surface pre-treatment and galvanizing of steel, in the form of plate and wire rod. Special attention will be devoted to ammonium-based solutions, as a still unexplored medium. This choice comes from the good performance of NH4Cl as zinc leaching agent of EAF dust, by preventing some drawbacks of the conventional approach with sulfuric acid.
Through a systematic study, electrolyte nature and concentration, temperature and applied potential have been identified as the most affecting operative
parameters for both formation and stability of plasma (Fig.1b). Under optimized working conditions, the effects of CPE on i) the surface morphology of the treated steel and ii) the features of the zinc deposit have been investigated by combining electrochemical and microscopic techniques, providing effectiveness clues.
Reference: [1] E.I. Meletis et al. Surf. Coat. Tech., 150 (2002) 246–256.
Acknowledgements: This research activity is supported by the “Reaxys SCI Small Research Grant” and it was supported by SIAT-Società Italiana Acciai Trafilati S.p.A and Engitec TECHNOLOGIES S.p.A
Il governo tecnico di Mario Monti
No full textIl capitolo esamina le principali caratteristiche del governo tecnico guidato da Mario Monti, insediatosi il 16 novembre 2011 e terminato il 21 dicembre 2012
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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