1,720,981 research outputs found
Produção de sementes do capim-branquiária : efeitos da remoção da forragem do corte de rebaixamento e da adubação nitrogenada
Get PDFSeed production of signalgrass (Brachiaria decumbens Stapf. cv. Basilisk) can be limited by not removing of plant residues after closing cleaning cut and by nitrogen fertilization. This study aimed to assess in signalgrass the effects of removal plant residues after close cleaning cut and N levels on seed yield and its components, and seed quality, in two consecutive growing seasons. The experimental design was a randomized block design with split plot with three replications. Treatments consisted of the removal or not of plant residues after closing cleaning cut, performed in the last weeks of September 2012 and January 2013 (main plot) and nitrogen levels zero, 50, 100 and 150 kg ha-1 (subplot). Practices of forage removal did not significantly affect the apparent seed yield and pure seed yield, as well as any component of seed quality. The forage removal had a significant effect only in the dry matter ha-1 in both growing seasons, and under the number of tillers with panicles in the growing season in the crop second. The interaction was significant for practice of forage removal and nitrogen levels at apparent seed yield and pure seed yield.A produção de sementes do capim-braquiária (Brachiaria decumbens Stapf. cv. Basilisk) pode ser limitada pela não remoção da forragem do corte de rebaixamento e pela falta de nitrogênio. Este estudo teve como objetivo avaliar em capim-braquiária os efeitos da remoção ou não da forragem após o corte de rebaixamento e da adubação nitrogenada sobre a produtividade de sementes e de seus componentes de produtividade e de qualidade em duas estações de crescimento consecutivas. O delineamento experimental foi o de blocos ao acaso, com parcelas subdivididas, com três repetições. Os tratamentos consistiram na remoção ou não da forragem após o corte de rebaixamento (parcela principal), realizado no final de setembro de 2012 e no final de janeiro de 2013 e as subparcelas foram as doses de nitrogênio zero, 50, 100 e 150 kg ha-1. A remoção da forragem não afetou significativamente a produtividade de sementes aparentes e a produtividade de sementes puras, bem como nenhum componente de qualidade de sementes. A remoção da forragem teve efeito significativo somente na produção de matéria seca por hectare, nas duas estações de crescimento avaliadas, e sobre o número de perfilhos com panícula, na segunda colheita. A interação foi significativa para prática de remoção da forragem e doses de nitrogênio na produção de sementes aparentes e produção de sementes puras.ix, 30
Análise de rentabilidade de bovinos terminados em confinamento e recriados em pastagens temperadas e tropicais
Get PDFTCC (graduação) - Universidade Federal de Santa Catarina. Centro de Ciências Agrárias. Curso de Zootecnia.Com o avanço da agricultura nas áreas de pecuária, arroba desvalorizando ao longo dos tempos, desconhecimento de grande parte dos pecuaristas sobre a viabilidade econômica da atividade, entre outros fatores, fez da pecuária uma atividade desacreditada. Dentro desse contexto, o presente trabalho realizou uma análise de rentabilidade de uma propriedade que emprega alta tecnologia, situada em Campo Mourão – PR. Esta possui ferramentas de intensificação do uso do solo como: a integração lavoura-pecuária e o confinamento. O estudo foi realizado entre maio de 2013 e junho de 2014, e foram avaliados dois ciclos produtivos, tanto da pecuária como da agricultura. A análise de rentabilidade foi realizada através do custo operacional total (COT), em que foi avaliada, da atividade agrícola a lavoura de trigo correspondente ao período seco (SEC) e a lavoura de soja que corresponde ao período das águas (AGU). A análise da atividade pecuária foi realizada a partir da compra dos animas desmamados, sendo machos inteiros, que foram terminados em confinamento e recriados em pastagens do período seco (SEC) e período das águas (AGU). A pecuária teve um lucro operacional por hectare (LO/ha) de R 3396,28 para AGU. Na agricultura o LO/ha foi de R 3109,92 para AGU. Ao final das avaliações, concluiu-se que agricultura foi mais rentável no SEC e a pecuária superou a atividade agrícola no AGU, e mostrou ser, uma atividade competitiva se comparada à atividade agrícola em ambos os momentos
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
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
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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