1,721,051 research outputs found
Niobium and titanium surface modification via anodic oxidation in Ca/P containing solutions for osteogenesis
No full textTransition metals are the materials of choice for the development of orthopaedic implants due to their biocompatibility. We focused on the surface modification of niobium and titanium through anodic oxidation to promote their osteogenic properties. Anodizing in solutions containing Ca and P allowed us to tailor the oxide morphology and chemical composition. By tuning the anodizing potential, mesoporous oxide layers with a surface chemical composition mimicking hydroxyapatite are obtained. By combining AFM, SEM and XPS we evaluated the
increase in porous size and layer thickness as a function of the applied potential and correlated it to the oxide chemical composition
Ricerca e sviluppo di tecnologie di bonifica di siti contaminati.
No full textIl libro raccoglie i proceedings della summer school avente titolo “Ricerca e sviluppo di tecnologie di bonifica di siti contaminati”, Savona, 7-12 settembre 2003. I contributi scientifici della manifestazione hanno avuto per oggetto lo stato e le prospettive della bonifica dei siti contaminati, e sono state proposte tecnologie di risanamento innovative. Sono inoltre discussi gli aspetti normativi delle bonifiche in Italia grazie al contributo di esperti qualificati di alto profilo professionale/scientifico. Infine sono raccolte e descritte le esperienze di alcuni professionisti del settore
Innovative approaches to the bioremediation of contaminated sites
No full textAccording to a recent survey, more than 500,000 sites, often former industrial sites, contaminated by organic pollutants and/or heavy metals occur in the European Union (EU). EU candidate states also possess a large number of contaminated lands, often located in areas within or near highly populated cities. Therefore, taken together, these sites constitute an enormous environmental problem which the recently enlarged EU has to take care of in the next few years. To address it, innovative and effective site-monitoring tools and strategies along with remediation technologies capable of combining high decontamination efficiency with low costs and impacts on the site infrastructure and living organisms are necessary. In terms of monitoring, biosensors along with ecotoxicity tests and molecular microbiology measurement techniques have become essential tools to reinforce the modern analytical chemistry tools, as they can offer specific information on the actual toxicity and microbial life occurring at the site. In terms of decontamination technologies, the biological ones, i.e., those that typically exploit the activity of pollutant-degrading site-occurring organisms, are greatly preferred to the chemical and physical technologies currently available on the market, as they fully fit the requirements listed above. Both the biological monitoring tools and in particular the innovative bioremediation technologies consist of a sophisticated combination of different aspects of modern biology, chemistry and engineering sciences, and therefore their design, development, and management require a broad and interdisciplinary background that is often not provided by the current EU University programs. Thus, it is necessary to train young EU researchers and technicians in the field of the design, implementation, assessment and site-specific management of the innovative biological monitoring tools and bioremediation technologies that have been recently introduced into the EU. The main objective of the School is to provide 25 selected young European scientists, engineers and technicians with a critical overview of the innovative aspects of the bio-chemical and molecular microbiology tools and bioremediation technologies currently available on the international market, along with experienced guidelines on how these tools and technologies can be selected, combined and adjusted to perform an efficient, reliable, sustainable, and cost-effective monitoring and ex-situ and/or in situ restoration of sites contaminated by organic pollutants and heavy metals
Innovative approaches to the management and physical & chemical remediation of contaminated sediments
No full textProceedings of the International Summer school: “Innovative approaches to the management and physical & chemical remediation of contaminated sediments”, Genoa, Italy, Sept 8-10, 2005
Biomonitoring, Bioavailability and microbial transformation of pollutants in sediments and approaches to stimulate their biodegradation
No full textProceedings of the International Summer school: “Biomonitoring, bioavailability and microbial transformation of pollutants in sediments and approaches to stimulate their biodegradation”. Genoa, Italy, Sept 12-14, 2005
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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