1,720,957 research outputs found
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
Relations between relief and spatial organization of the use and land cover in southwestern Goiás
No full textDissertação (mestrado)—Universidade de Brasília, Instituto de Geociências, Pós-Graduação em Geologia, 2016.O relevo é um dos fatores que formam a paisagem, fundamental para análise da cobertura da terra e o planejamento ambiental. Dentro deste contexto se insere o presente trabalho, cujo objetivo foi estudar as relações entre os padrões de relevo e a organização do uso e cobertura do solo das bacias hidrográficas do Rio Paranaíba, Rio do Peixe, Rio Bonito, Rio Diamantino, Rio dos Bois e Rio Claro, localizadas no sudoeste do estado de Goiás, e representativas dos sistemas agrícolas da ecorregião Paraná-Guimarães. O mapeamento das unidades de relevo consistiu na utilização de cenas da missão Shuttle Radar Topography Mission (SRTM) e posteriormente a classificação supervisionada para delimitação dos compartimentos de relevo. Para integração das informações obtidas do relevo com os dados geológicos e de uso e cobertura da terra, foram utilizadas a base do acervo de Estudos Integrados de Bacias Hidrográficas (EIBH), Sudoeste do Estado de Goiás e do Macrozoneamento Agroecológico e Econômico do estado de Goiás (MACROZAEE-GO), respectivamente. Foi possível identificar oito unidades de relevo dentro da área de estudo: Planalto Residual (15,53%), Planalto Parcialmente Denudado (6,20%), Mesa (1,43%), Frente de Recuo Erosivo (7,60%), Rampas de Colúvio (7,45%), Depressão Intraplanáltica (22,80%), Depressão Dissecada (35,35%) e Planície Fluvial (3,64%). De modo geral, em todas as unidades de relevo se verificou a relação existente com as unidades geológicas e com as classes de uso e cobertura da terra. A Depressão Dissecada sobre a Formação Adamantina dominam as coberturas formadas por pastagens cultivadas e constitui a unidade mais representativa em termos de área e delimitação da paisagem. Por outro lado, no Planalto Residual e no Planalto Parcialmente Denudado sobre a Formação Cachoeirinha predominam a cobertura agrícola. O estudo mostrou que a ação antrópica predomina sobre relevos planos e contínuos e também em áreas de relevo ondulado e de baixas altitudes. Nas áreas com declividade elevada a cobertura de cerrado se destaca em função das limitações de outros tipos de uso. Conclui-se que a abordagem utilizada de mapeamento do relevo constitui uma importante ferramenta nos estudos de paisagem.The relief is one of the factors of landscape, fundamental for the analysis of land cover and environmental planning. This study presents the relationship between the relief patterns and land use land cover organization on watersheds Paranaíba River, Peixe of River, Bonito River, Diamantino River, Bois of River, located in Southwest Goiás and, representative of farming systems the Paraná-Guimarães ecoregion. The mapping of landscape units was the use scenes of Shuttle Radar Topography Mission (SRTM) and later the supervised classification for delimitation of the relevant compartments. For integration of information obtained relief with geological data and use and land cover were used to base the Integrated Watershed Studies (EIBH), Southwestern Goiás and the Agroecological and Economic Macrozoning of state Goiás (MACROZAEE-GO), respectively. Was identified eight relevant units within the study area: Residual Plateau (15.53%), Partly Denudated Plateau (6.20%), Mesa (1.43%), Erosive Front (7.60%), Colluvial Ramps (7.45%), Intraplanaltic Depression (22.80%), Dissected Depression (35.35%) and Plain River (3.64%). In general, in all relevant relief units was found the relationship with the geological units and the land use and land cover classes. In the Dissected Depression on Adamantina Formation dominate the cultivated pastures is the most representative unit in terms of area and delimitation of the landscape. On the other hand, the Residual Plateau and Partly Denudated Plateau on Cachoeirinha Formation and Cobertura Arenosa predominates agricultural cover. The study showed that human action predominates over plans and continuous relief and also in areas of undulating relief and low elevations. In areas with high slope the cerrado cover stands out due to the limitations of other types of use. The study concludes that the relief mapping approach used is an important tool in landscape studies.Instituto de Geociências (IG)Programa de Pós-Graduação em Geologi
Dinâmica espaço-temporal da cultura de soja no cerrado, analisada por meio de estatística espacial e dados físicos, socioeconômicos e ambientais
Full text linkTese (doutorado)—Universidade de Brasília, Instituto de Geociências, Pós-Graduação em Geociências Aplicadas, 2020.O entendimento da expansão da produção agrícola de uma determinada região é
fundamental para o seu planejamento territorial e desenvolvimento regional. Devido ao
aumento da demanda mundial por alimentos, ampliação do poder aquisitivo da
população e o potencial de diversificação dos produtos, o cultivo da soja configura em
grande relevância econômica para o Brasil. O objetivo geral desta pesquisa foi analisar a
dinâmica da cultura de soja no Cerrado entre 1974 a 2014 e identificar áreas potenciais
de expansão agrícola por meio de estatística espacial e dados físicos, socioeconômicos e
ambientais. O estudo foi baseado nos dados de Produção Agrícola Municipal (PAM) do
Instituto Brasileiro de Geografia e Estatística (IBGE), obtidos em 1974, 1984, 1994,
2004 e 2014. Esses dados foram analisados por meio do índice de Gini para averiguar o
grau de concentração da produção de soja no Cerrado e por meio dos índices de Moran
global (I) e local (Ii) para mensurar o grau de correlação espacial existente entre as
principais microrregiões produtoras de soja. Para caracterização socioeconômica dessas
áreas, foram utilizados dados da PAM de produção de soja anual (t) no período de 1974
a 2018 e de área colhida de soja (ha) referente ao ano de 2018, Índice de
Desenvolvimento Humano (IDH) e Produto Interno Bruto (PIB). O aspecto ambiental
foi analisado por meio das Áreas de Preservação Permanente, mapeadas pelas Fundação
Brasileira de Desenvolvimento Sustentável. A identificação das áreas potenciais de
expansão agrícola deu-se pela integração dos seguintes dados: de agricultura anual e
pastagem do mapeamento realizado no âmbito do Projeto TerraClass Cerrado 2013;
precipitação média anual e mensal obtida pela plataforma WorldClim2 e INMET; mapas
de solos e geomorfologia do IBGE na escala de 1:250.000; mapa de terras indígenas da
Fundação Nacional do Índio (FUNAI); e mapa de unidades de conservação do Instituto
Chico Mendes de Conservação da Biodiversidade (ICMBio). Os resultados indicaram
que as principais regiões produtoras de soja se encontram nas microrregiões do Mato
Grosso, Mato Grosso do Sul, Bahia, Goiás, Maranhão e Piauí. A análise do índice de
Gini, I e Ii demonstrou que a produção de soja no Cerrado é feita com grande
concentração geográfica em regiões específicas. No período considerado de 40 anos
(1974 a 2014), a produção expandiu, inicialmente, das regiões sul para o centro-oeste do
bioma, porém, a partir da década de 2000, surgiram três novos hotspots (oeste da Bahia
e sul do Maranhão e Piauí). A caracterização física, socioeconômica e ambiental
identificou que as melhores condições são encontradas no estado do Mato Grosso. Em contrapartida, as piores condições foram encontradas na região de MATOPIBA. As
microrregiões de Mato Grosso e Goiás obtiveram o maior desempenho econômico e
melhor indicador social. As áreas potenciais de expansão agrícola estão concentradas
em Goiás e Mato Grosso do Sul. Os resultados obtidos neste estudo fornecem subsídios
para orientar as políticas econômicas de exportação de commodities agrícolas, políticas
públicas e ações do setor produtivo voltadas para estoque regulador de grãos, melhoria
na logística de transporte e incentivo à implantação de uma agricultura ambientalmente
sustentável.Understanding the expansion of agricultural production in a given region is fundamental
to its territorial planning and regional development. Due to the increase in the world´s
demand for food, expansion of the population's purchasing power and the potential for
product diversification, soybean cultivation is of great economic relevance for Brazil.
The general objective of this research was to analyze the dynamics of the soybean
culture in the Cerrado (1974 to 2014) and identify potential areas for agricultural
expansion using spatial statistics and physical, socioeconomic and environmental data.
The study was based on Municipality Agricultural Production data from the Brazilian
Institute of Geography and Statistics (IBGE), obtained in 1974, 1984, 1994, 2004, and
2014. These data were analyzed using the Gini index to ascertain the degree of
concentration of soybean production in the Cerrado and through global and local Moran
indices to measure the degree of spatial correlation between the main soybean producers
in terms of microregions. For socioeconomic characterization of these areas, data from
the PAM of annual soybean production (t) from 1974 to 2018 and harvested soybean
area (ha) for the year 2018, Human Development Index (HDI) and the Gross Domestic
Product (GDP) were selected. The environmental aspect was analyzed through the
Permanently Protected Areas, mapped by the Brazilian Foundation for Sustainable
Development. The identification of potential areas for agricultural expansion was
achieved by integrating the following data: annual agriculture and pasture data from the
mapping carried out within the scope of the TerraClass Cerrado Project from 2013;
precipitation data obtained by the WorldClim2 platform and NMI; soil and
geomorphological maps produced by IBGE on 1:250,000 scale; indigenous land map,
obtained from the National Indian Foundation (FUNAI); conservation units map,
obtained from the Chico Mendes Institute for Biodiversity Conservation (ICMBio). The
results indicated that the main producing regions are found in the microregions of Mato
Grosso, Mato Grosso do Sul, Bahia, Goiás, Maranhão and Piauí. The analysis of the
Gini index, global Moran index and local Moran index demonstrated that the production
of soybean in the Cerrado is conducted with great geographical concentration in specific
regions. In the 40-year period (1974 to 2014), production initially expanded from the
south regions to the center-west of the biome, however, since 2000s, three new hotspots
emerged (western Bahia and southern Maranhão and Piauí). The best socioeconomic
and environmental conditions were found in the Mato Grosso state. On the other hand, the worst conditions were found in the MATOPIBA region. The microregions of Mato
Grosso and Goiás had the highest economic performance and the best social indicator.
The areas with high potential for agricultural intensification are concentrated in Goiás
and Mato Grosso do Sul. The results obtained in this study provide subsidies to guide
policies of agricultural commodities exportation, public policies and actions in the
productive sector aimed at regulating grain stocks, transportation logistics, and to
encourage the implementation of environmentally sustainable agriculture.Instituto de Geociências (IG)Programa de Pós-Graduação em Geociências Aplicadas e Geodinâmic
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
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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