1,721,005 research outputs found
Cousteaudinium aubryae (Dinophyceae, Cribroperidinioideae) from the lower to middle Miocene of the Pelotas Basin, southern Brazil: Morphology, biochronostratigraphy and paleobiogeography
No full textIn this paper, we present a detailed morphological study of Cousteaudinium aubryae (de Verteuil and Norris, 1996) from Miocene deposits of the Pelotas Basin, southern Brazil. C. aubryae is a cyst of an autotrophic dinoflagellate with a great intraspecific morphological variability, evidenced by cavation type and degree, perforations and wall projections. Four morphotypes were identified, which are comparable with specimen records from other continents (e.g. North America and Europe). C. aubryae last occurred in the Pelotas Basin at levels chronocorrelated to the Helicosphaera ampliaperta calcareous nannofossil zone (N-570), suggesting age between Burdigalian and Langhian for the deposits of the Imbé and Cifreira formations. Integration of species records from different latitudes shows a paleobiogeographic distribution pattern predominantly in mid-latitudes, suggesting that C. aubryae was better adapted to non-tropical and no-polar climatic conditions during the early to mid Miocene.Fil: Premaor, Eduardo. Universidade Federal do Rio Grande do Sul; BrasilFil: Ferreira, Elizabete P.. No especifíca;Fil: Guerstein, Gladys Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Souza, Paulo A.. Universidade Federal do Rio Grande do Sul; BrasilFil: Arai, Mitsuru. Universidade Estadual Paulista Julio de Mesquita Filho; Brasi
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
Palinologia da seção Albiana-Capaniana da Bacia de Pelotas (RS) : implicações bioestratigráficas e paleoambientais
Full text linkZoneamentos bioestratigráficos foram elaborados para os depósitos cretáceos de todas as bacias da margem costeira brasileira, excetuando-se a Bacia de Pelotas, cujo conhecimento micropaleontológico é restrito a microfósseis de parede calcária, justificando o levantamento sistemático de dados palinológicos em todas as suas seções. Este trabalho apresenta os resultados da análise palinológica realizada em 37 amostras de calha e 7 amostras de testemunhos de sondagem dos poços BP-01 e BP-02, respectivamente, perfurados na bacia, que revelou associações relativamente diversificadas e abundantes, com significado bioestratigráfico e paleambiental. Um total de 123 táxons de palinomorfos foi identificado, compreendendo 60 táxons de esporomorfos (28 de esporos, 32 de grãos de pólen), algas (60 de Dinophyceae e 3 de Prasinophyceae), incluindo 9 táxons registrados pela primeira vez na margem costeira brasileira; palinoforaminíferos, ovos de copépodes, fungos indeterminados e escolecodontes também foram reconhecidos Em termos bioestratigráficos, as associações do poço BP-02 indicam quatro idades entre o Albiano e o Campaniano, tendo como base os zoneamentos previamente publicados em outras bacias: (i) Albiano (extinção de Oligosphaeridium aff. Complex); Cenomaniano (extinção Endoceratium dettmanniae); (ii) Turoniano (extinção Cribroperidinium cf. edwardsii); (iv) Santoniano (extinção aparente de Anacolosidites sp. A e ocorrência Steevesipollenites aff. nativensis). As amostras do poço BP-01 revelaram uma associação mais jovem, atribuída ao Campaniano, considerando a associação de Trichodinium castanea, Odontochitina porífera e Isabelidinium pellucidum. Considerando a composição das paleofitoprovíncias definidas para a margem atlântica durante o Cretáceo, os depósitos estudados comportam associações diferenciadas, inserindo-se em um contexto de transição, entre as províncias adjacentes reconhecidas a norte e a sul da bacia, com elementos endêmicos (p. ex.: Anacolosidites sp. A), podendo caracterizar uma porção particular da paleoflora sul-americana no intervalo Embora a natureza marinha das amostras seja inquestionável pela presença de dinoflagelados e palinoforaminíferos, altas freqüências relativas de elementos da microflora terrestre são observadas, indicando significativa proximidade do sítio deposicional do continente; além disso, tétrades encontram-se preservadas na maioria dessas amostras. A presença e abundância relativa de determinados gêneros de grãos de pólen em certos intervalos do poço BP-02 (p. ex.: Classopollis, Circulina, Inaperturopollenites) são indicativas de condições paleoclimáticas áridas e quentes.Biostratigraphic schemes were developed for Cretaceous deposits of all Brazilian coastal margin basins, excluding the Pelotas Basin, whose micropaleontological knowledge is restricted to calcareous microfossils, but palynological data are needed. This work presents results from palynological analysis performed in 37 cuttings samples and 7 core samples derived from the BP-01 and BP-02, respectively, drilled in this basin. Diverse and abundant associations were revealed, wich biostratigraphical and paleoenvironmental significance. 123 palynomorphs taxa were identified, related to 60 sporomorphs (28 spores, 32 pollen grains), algae (60 Dinophyceae and 3 Prasinophyceae), including 9 species unknown for the Brazilian coastal margin basins. Furthermore, palynoforaminifers, copepods eggs, indeterminate fungi and scolecodonts were also recognized. In biostratigraphic terms, associations from the well BP-02 indicate four ages within the Cretaceous, from Albian to Campanian, based on data from other basins: (i) Albian (last appearance of Oligosphaeridium aff. complex); Cenomanian (last appearance of Endoceratium dettmanniae) (ii) Turonian (last appearance of Cribroperidinium cf. edwardsii) (iv); Santonian (apparent extinction of Anacolosidites sp. A and the record of Steevesipollenites aff. nativensis) Well BP-01 samples showed a younger association, attributed to the Campanian, taking into account the associaton of Trichodinium castanea, Odontochitina porífera and Isabelidinium pellucidum. Considering the composition of certain paleophytoprovincias defined for the Atlantic margin during the Cretaceous, studied deposits contain different associations, once is placed into a transition context, between the recognized adjacent provinces at north and at south of the basin. Endemic elements (e.g.: Anacolosidites sp. A) might characterize a particular paleoflora within the South American. Although the marine nature of these deposits be unquestionable, by the presence of dinoflagellates and palynoforaminifers, high relative frequencies of terrestrial microfloristic elements are observed, indicating a significant proximity of the depositional site to the continent; in addition, tetrads are preserved in most of these samples, corroborating this idea. The presence and relative abundance of certain pollen grains genus, in particular from the well BP-02 (eg.: Classopollis, Circulina, Inaperturopollenites) are used as paleoclimatic indicative of arid and hot conditions
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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