1,721,203 research outputs found
Remoción de fluoruros mediante adsorción en arcillas residuales
Get PDFFil: Ruiz, Rodrigo Leonardo. Universidad Nacional de Córdoba. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Francisca, Franco M. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.En este artículo se analiza la aptitud de los suelos lateríticos proviene de la ciudad de Oberá, en Misiones como material adsorbente para la remoción de fluoruros. Para ello se realizan ensayos tipo Batch en laboratorio con el objeto de calibrar isotermas de adsorción. Los resultados de isotermas de adsorción son utilizados para predecir el transporte de masa en un medio poroso reactivo con capacidad para adsorber fluoruros. La Figura 1 muestra un análisis elemental a nivel superficial de las partículas del suelo. El análisis evidencia la presencia destacada de aluminio y hierro. En la Figura 2 se observa la variación en el porcentaje de remoción en función de la concentración inicial de fluoruros en solución. Los resultados obtenidos permiten verificar la aptitud de los suelos residuales de Oberá, Misiones, con alto contenido de arcillas y óxidos de hierro y aluminio, para la remoción de fluoruros en el agua. Estos resultados permiten corroborar la aptitud de este suelo como material de construcción de filtros o barreras permeables reactivas, permeables al líquido y con capacidad de retener el contaminante.Fil: Ruiz, Rodrigo Leonardo. Universidad Nacional de Córdoba. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Francisca, Franco M. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Ingeniería Medioambiental y Geológica, Geotécnica
Deep sea archaeological survey in the Black Sea – robotic documentation of 2,500 years of human seafaring
No full textBetween 2015 and 2017 the Black Sea Maritime Archaeology Project (Black Sea MAP) discovered and recorded 65 shipwreck sites dating from the 4th Century BC to the 19th Century AD in the Bulgarian Exclusive Economical Zone (EEZ). Using state-of-the-art remotely operated vehicles to survey the seabed, the team captured more than 250,000 high-definition (HD) photographs; hundreds of hours of ultra high-definition (UHD) video together with acoustic bathymetric, laser, side-scan sonar and seismic data. The wrecks were located in depths from 40 to 2,200 metres – those shipwrecks in the deeper range presented extraordinary archaeological preservation due to the Black Sea’s anoxic conditions. This paper will introduce the range of deep-sea optic and acoustic survey techniques to accurately record and create 3D and pseudo 4D models of the shipwrecks. It will focus on a Early 4th Century BC shipwreck demonstrating the project’s survey strategy as well as adaptations developed in response to operational conditions; the implementation of deep sea robotics to generate georeferenced high-resolution photogrammetric models and the benefits this has as an on-site, as well as a post-cruise, interpretative tool. It demonstrates that in-theatre acquisition and processing of high-quality datasets is a working reality and has fundamental implications for management as well as the advantages that this brings to the archaeological research process: Firstly, in the creation of spatio-temporal models, i.e., 4D representations of a site pre and post archaeological excavation and secondly, in monitoring such wreck sites, and provides a viable non-intervention tool for the assessment of sites as part of a long-term management strategy. It also shows the value of well-funded collaboration between academia and industry and that deep water archaeology can and must be totally in accordance to the 2011 United Nations Educational, Scientific and Cultural Organization (UNESCO) convention
Maritime lives in Iron Age Britain
No full textIron Age coastal communities in England have been poorly understood since the beginning of our discipline. This is mainly as result of the lack of evidence for everyday maritime activities and also the focus of research on explaining an agro-pastoral way of living. Evidence of fishing, boats, harbour structures and ports are very rare archaeologically, and thinking about people living by the sea in this period has been widely overlooked as most of the interest has been the nature of the connections and trade-networks (mainly by Cunliffe 2008). In contrast, evidence for non maritime activities, such as farming and cattle rearing is so rich that looking to the coast only happens in special situations.Using the Isles of Scilly as a case study, this research challenges the established views that societies on the coasts of south-west of England were mainly cattle herders and farmers. Through palaeolandscape reconstruction, site analysis and material culture study, this research argues that settlement on the coastline is as important as that found inland. It shows that Iron Age maritime aspects of culture were deeply embedded within cultural traditions and that the maritime way of living had little to do with extraordinary or unusual situations.This research shows that preconceived ideas of what a maritime site should look like, as is the case of harbour structures and important ports, divert the attention from the subtleties of recognising maritime culture’s signature. It is through the study of archaeological context and environmental evidence that these are likely to become more obvious. Therefore, throughout this document the analysis of maritime landscape, settlement pattern and material culture generates new perspectives on how to approach the study of maritime societies in archaeology.<br/
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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