1,721,243 research outputs found
Three new species of Macrelmis Motschulsky, 1859 (Coleoptera: Elmidae: Elminae) from the Brazilian Cerrado Biome with updated key for the Macrelmis of Brazil
No full textBarbosa, Felipe Francisco, Fernandes, André Silva, Oliveira, Leandro Gonçalves (2013): Three new species of Macrelmis Motschulsky, 1859 (Coleoptera: Elmidae: Elminae) from the Brazilian Cerrado Biome with updated key for the Macrelmis of Brazil. Zootaxa 3736 (2): 128-142, DOI: 10.11646/zootaxa.3736.2.
FIGURES 10–13 in Three new species of Macrelmis Motschulsky, 1859 (Coleoptera: Elmidae: Elminae) from the Brazilian Cerrado Biome with updated key for the Macrelmis of Brazil
No full textFIGURES 10–13. Macrelmis nessimiani sp. nov. (male Paratypus): 10) habitus, dorsal view; 11) habitus, ventral view; 12) male genitalia, dorsal view; 13) male genitalia, lateral view. Scale: 1.0 mm (2, 3), 100 µm (4, 5).Published as part of Barbosa, Felipe Francisco, Fernandes, André Silva & Oliveira, Leandro Gonçalves, 2013, Three new species of Macrelmis Motschulsky, 1859 (Coleoptera: Elmidae: Elminae) from the Brazilian Cerrado Biome with updated key for the Macrelmis of Brazil, pp. 128-142 in Zootaxa 3736 (2) on page 136, DOI: 10.11646/zootaxa.3736.2.2, http://zenodo.org/record/21911
An extraordinary case of elytra loss in Coleoptera (Elateroidea: Lycidae): discovery and placement of the first anelytrous adult male beetle
No full textFerreira, Vinicius S., Barbosa, Felipe Francisco, Bocakova, Milada, Solodovnikov, Alexey (2023): An extraordinary case of elytra loss in Coleoptera (Elateroidea: Lycidae): discovery and placement of the first anelytrous adult male beetle. Zoological Journal of the Linnean Society 199 (2): 553-566, DOI: 10.1093/zoolinnean/zlad026, URL: http://dx.doi.org/10.1093/zoolinnean/zlad02
Balgus subfasciatus
No full textBalgus subfasciatus (Bonvouloir, 1875) Pterotarsus subfasciatus Bonvouloir, 1875: 832, 840 (original description). Balgus subfasciatus Fleutiaux, 1920: 98 (new combination); Schenkling, 1928: 7 (catalogue); Blackwelder, 1944: 275 (catalogue). Diagnosis. S ubcylindrical body; dorsal and ventral region covered with sparse yellow pubescence; posterior angle of pronotum with short and oblique carina; scutellum carinate; elytra with anterior suboval tubercle, covered with strong rugosities, posterior half of elytra without tubercles; longitudinal median carina of ventrite 5 with four small teeth. Female genitalia: unknown. Aedeagus: unknown. Etymology. [sub + fasciatus]. sub, from Latin, “below”, “less” or “almost”, fasciatus, from Latin, “with bands”, in reference to the elytral pattern of bands. Distribution. Colombia (Figure 15). Type locality. Colombia (Bonvouloir, 1875). Note. This species was not evaluated in this study, material was not available. The diagnosis was based on the original description and this species was not included into the matrix, because of the large amount of missing data.Published as part of Barbosa, Felipe Francisco, 2016, Revision and phylogeny of the genus Balgus Fleutiaux, 1920 (Coleoptera, Elateridae, Thylacosterninae), pp. 451-482 in Zootaxa 4083 (4) on page 468, DOI: 10.11646/zootaxa.4083.4.1, http://zenodo.org/record/105090
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
Avaliação da estabilidade oxidativa do biodiesel obtido a partir de óleo residual.
Get PDFBARBOSA, Felipe Araújo. Avaliação da estabilidade oxidativa do biodiesel obtido a partir de óleo residual. 2017. 62 f. TCC (Graduação) - Curso de Engenharia de Energia, Instituto de Engenharias e Desenvolvimento Sustentável, Universidade da Integração Internacional da Lusofonia Afro-brasileira, Acarape-Ceara, 2017.O biodiesel é um biocombustível de origem renovável que pode ser obtido por diversas oleaginosas. Sua produção utilizando óleos residuais de fritura como matéria-prima vem sendo bastante investigada, uma vez que, é um resíduo que pode ser reutilizado trazendo benefícios econômicos e ambientais. No entanto sua utilização ainda possui alguns entraves, e atualmente um dos obstáculos enfrentados está relacionado ao seu armazenamento, que quando exposto ao ambiente torna-se muito suscetível a oxidação. Dessa forma faz-se necessário o uso de aditivos antioxidantes que retardem as reações indesejáveis de oxidação. Assim, o presente trabalho tem como objetivo avaliar o óleo residual de fritura como matéria-prima para a produção de biodiesel, assim como caracterizá-lo e testar sua estabilidade oxidativa com a adição dos antioxidantes BHT, Ionol e Cardonol hidrogenado. O óleo residual foi filtrado, caracterizado e em seguida submetido ao processo de transesterificação alcalina. O biodiesel obtido foi caracterizado e aditivado pelos antioxidantes BHT, Ionol e Cardonol hidrogenado na proporção 0,1% (m/m). Os resultados encontrados permitem concluir que os parâmetros índice de acidez e teor de saponificação se alteram com o decorrer do tempo e que só foi possível produzir biodiesel com taxas de conversão entre 70 % e 80 %. A acidez, umidade e estabilidade oxidativa do biodiesel ficaram em desconformidade com a norma reguladora ANP/45. Em contrapartida os demais parâmetros atenderam aos padrões estabelecidos pela norma. O Ionol foi o composto que apresentou melhores tempos de indução quando adicionado ao biodiesel. Seguido do BHT demonstraram ser agentes antioxidantes que prolongam o início das reações de oxidação. Já o Cardonol hidrogenado derivado da biomassa, reduziu a estabilidade oxidativa do biodiesel
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
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