1,722,339 research outputs found
Foucault’s History of Sexuality and its Impasse: from Governement of the Living to Confessions of the Flesh
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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
Ocorrência de parasitas intestinais e sua relação com saneamento básico
Get PDFOLIVEIRA, Camila Tâmires Alves. Ocorrência de parasitas intestinais e sua relação com saneamento básico. 2018. 26 f. Monografia (Especialização) - Curso de Especialização em Gestão em Saúde, Instituto de Ciências da Saúde - ICS, Universidade da Integração Internacional da Lusofonia Afro-Brasileira, Limoeiro do Norte, 2018.As enteroparasitoses representam um grave problema de saúde pública, principalmente em
países em desenvolvimento. A partir desta premissa, o objetivo deste estudo foi delinear o perfil
enteroparasitológico dos habitantes do Vale do Jaguaribe, estado do Ceará, Brasil. Os dados
secundários dos exames coproscópicos foram fornecidos por um laboratório de análises clínicas,
situado em Fortaleza, no estado do Ceará. Foram realizados 1.747 análises de resultados de
exames parasitológicos, dos quais foram obtidos a partir do estudo, 14,2% (n=248) casos
positivos, sendo que, 15% (n=169) deste resultado corresponderam a mulheres parasitadas, e
apenas 12% (n=79) a homens infectados. Ocorreu maior prevalência de parasitismo por
organismos comensais, correspondendo a uma prevalência de 12% (n=201) dos pacientes
infectados, e apenas 3% (n=60) de parasitismo por organismos patogênicos. O parasita
comensal mais predominante entre os resultados positivos foi Endolimax nana, com prevalência
de 9%. Dentre os parasitas patogênicos, Giardia lamblia teve maior prevalência, correspondendo
a 3% dos casos ocorridos. Estes resultados indicam que, as condições sanitárias no Vale do
Jaguaribe, apesar de não serem totalmente adequadas, reduziram a ocorrência de casos
positivos de enteroparasitoses. No entanto, o saneamento ambiental, ainda precisa ser
melhorado na região, para eliminar todas as possibilidades de infecção
Figure 1 in Defensive behaviour and tail autotomy in Coleodactylus meridionalis (Squamata: Sphaerodactylidae)
No full textFigure 1. Frequency of behaviours displayed by Coleodactylus meridionalis in an Atlantic Rain Forest fragment, Pernambuco, northeastern Brazil (n = 253).Published as part of Oliveira, Camila N., Campos, Ikaro H. M. P., Provete, Diogo B., Guarnieri, Míriam C. & Ribeiro, Samuel C., 2021, Defensive behaviour and tail autotomy in Coleodactylus meridionalis (Squamata: Sphaerodactylidae), pp. 2209-2218 in Journal of Natural History 54 (33-34) on page 2211, DOI: 10.1080/00222933.2020.1840641, http://zenodo.org/record/502913
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
An Enviromental-Friendly Process for the Recovery of Tantalum from Waste Capacitors
No full textTantalum (Ta) is a metallic element naturally occurring within the mineral columbite, which also encompasses niobium. The extraction of pure tantalum from this mineral necessitates highly costly processes such as pyrometallurgy and the utilization of hazardous chemical agents.
Tantalum has been identified as one of the Critical Raw Materials for the European Union in 2023. It possesses a Supply Risk (SR) of 1.3 and a moderate Economic Importance (EI) of 4.8. Its criticality is attributed due to the extraction sites primarily situated in conflict-affected regions. Moreover, the tantalum end-of-life recycling input rate (EOL-RIR) indicates a restricted contribution to the production system from recycling end-of-life scrap, with only 1%. The most common methods for its recovery from e-waste include the use of strong acids, hazardous chemicals, or high-temperature treatment.
Tantalum capacitors are typically a casing of epoxy resin loaded with glass particles, containing three main components: an anode, typically composed of tantalum wire; a cathode, made of manganese oxide or conductive polymer; and a dielectric layer of tantalum pentoxide. Additional conductive layers, such as graphite and silver, are incorporated to minimize resistance to the terminals, often made of Fe-Ni or Cu.
In this work, a process toward a low-cost and sustainable method for the recovery of tantalum from capacitors was performed. The first step was focused on the physical-mechanical treatment. In particular, a batch of capacitors was treated by means of milling, size classification, and magnetic separation, where the terminals, made of Fe-Ni or Cu, were recovered. The electrostatic separation was performed on the non-magnetic fraction, removing the non-conductive product (polymers).
The conductive product, containing mainly Ta, MnO2, Ag, was next subjected to the chemical treatments, first with ascorbic acid and then with a solution of ammonium thiosulfate, ammonia and copper sulphate, removing MnO2 and Ag, respectively. Leaching products have been analysed by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD), revealing good results for the application of a green process for tantalum recovery from spent capacitors. The final product, in which 99.9% of Mn and 50% Ag have been removed, consists of a powder with high concentrations of tantalum (up to 94%)
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