1,357,531 research outputs found
1980-04-15 Report to the Region: Keith Kappes Interviews Morehead State University President Morris Norfleet
No full textKeith Kappes interviews Morehead State University president Morris Norfleet about his recent travels and honors overseas, as well as a select few topics related to the university, recorded on April 15, 1980, original air date, April 23, 1980
Searching for tau neutrinos with Cherenkov telescopes
No full textCherenkov telescopes have the capability of detecting high energy tau neutrinos in the energy range of 1–1000 PeV by searching for very inclined showers. If a tau lepton, produced by a tau neutrino, escapes from the Earth or a mountain, it will decay and initiate a shower in the air which can be detected by an air shower fluorescence or Cherenkov telescope. In this paper, we present detailed Monte Carlo simulations of corresponding event rates for the VERITAS and two proposed Cherenkov Telescope Array sites: Meteor Crater and Yavapai Ranch, which use representative AGN neutrino flux models and take into account topographic conditions of the detector sites. The calculated neutrino sensitivities depend on the observation time and the shape of the energy spectrum, but in some cases are comparable or even better than corresponding neutrino sensitivities of the IceCube detector. For VERITAS and the considered Cherenkov Telescope Array sites the expected neutrino sensitivities are up to factor 3 higher than for the MAGIC site because of the presence of surrounding mountains
Coeficientes de solidarismo e empreendedorismo e sua influência na sobrevivência dos empreendimentos econômicos solidários da Região Sul
No full textAo analisar os dados do Primeiro Mapeamento Nacional da Economia Solidária, Gaiger (2007) criou os Coeficientes de Alto e Baixo Solidarismo e Empreendedorismo, com o objetivo de verificar a relação entre as dimensões solidária e empreendedora dos EES. Em trabalho posterior, quando os resultados do Segundo Mapeamento Nacional foram disponibilizados, Kuyven e Kappes (2013) utilizaram os mesmo coeficientes para analisar sua influência na sobrevivência dos EES entre os dois mapeamentos. O presente artigo tem por objetivo elaborar um modelo Logit para analisar a influência dos fatores apontados como relevantes por Kuyven e Kappes (2013) na sobrevivência dos EES. Verifica-se que a capacidade de obtenção de crédito e a tomada de decisões de forma coletiva são fatores positivos para a sobrevivência dos EES, ao passo que a incapacidade de pagar as despesas e a ausência de atividade coletiva são fatores negativos para a sobrevivência dos EES
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Assembly of the eukaryotic PLP-synthase complex from plasmodium and activation of the Pdx1 enzyme
No full textBiosynthesis of vitamins is fundamental to malaria parasites. Plasmodia synthesize the active form of vitamin B6 (pyridoxal 5-phosphate, PLP) using a PLP synthase complex. The EM analysis shown here reveals a random association pattern of up to 12 Pdx2 glutaminase subunits to the dodecameric Pdx1 core complex. Interestingly, Plasmodium falciparum PLP synthase organizes in fibers. The crystal structure shows differences in complex formation to bacterial orthologs as interface variations. Alternative positioning of an a helix distinguishes an open conformation from a closed state when the enzyme binds substrate. The pentose substrate is covalently attached through its C1 and forms a Schiff base with Lys84. Ammonia transfer between Pdx2 glutaminase and Pdx1 active sites is regulated by a transient tunnel. The mutagenesis analysis allows defining the requirement for conservation of critical methionines, whereas there is also plasticity in ammonia tunnel construction as seen from comparison across different species.<br/
Variations on the Author
No full text“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
No full textWe 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
Descriptional complexity of cellular automata and decidability questions
No full textWe study the descriptional complexity of cellular automata (CA), a parallel model of computation. We show that between one of the simplest cellular models, the realtime-OCA. and "classical" models like deterministic finite automata (DFA) or pushdown automata (PDA), there will be savings concerning the size of description not bounded by any recursive function, a so-called nonrecursive trade-off. Furthermore, nonrecursive trade-offs are shown between some restricted classes of cellular automata. The set of valid computations of a Turing machine can be recognized by a realtime-OCA. This implies that many decidability questions are not even semi decidable for cellular automata. There is no pumping lemma and no minimization algorithm for cellular automata
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Entrega del Premio “Estímulo 2021 Ing. Antonio Adrián Quijano” al Ing. Mariano Alberto Kappes
No full textLa Academia de la Ingeniería de la Provincia de Buenos Aires entregó el “Premio estímulo 2021 Ing. Antonio Adrián Quijano” al Dr. Ing. Mariano Alberto Kappes. Este premio se otorga cada tres años y tiene por objeto servir de incentivo a jóvenes ingenieros argentinos, que hayan efectuado trabajos creativos y originales en cualquiera de las especialidades de la ingeniería, tanto en áreas de investigación, ingeniería de proyecto o trabajos de obra.Academia de la Ingeniería de la provincia de Buenos Aire
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