1,720,966 research outputs found
Eficiência de uso de fósforo em genótipos de meloeiro
Full text linkThe establishment of breeding programs in melon in order to improve the phosphorus use efficiency is important to reduce the use of phosphate fertilizers and minimize the environmental and economic effects of agriculture. The objective of this work was to determine the efficiency of phosphorus use of melon genotypes cultivated in hydroponic system. The experiment was carried out in a greenhouse at the Federal Rural University of Semi-Arid, in Mossoró, Rio Grande do Norte. Evaluating 10 melon genotypes, five of which are improved cultivars (vereda, gaúcho redondo conesul (GRC), amarillo canário (Aca), gaúcho casca de carvalho (GCC) e trinity) and trinity) and five unimproved (A-02, A-16, A -29, A-50 and A-52), which were submitted to two nutrient solutions (S1 - nutrient solution without phosphorus restriction (P +) and S2- nutrient solution with phosphorus restriction (P-)). The experimental design adopted was in randomized blocks, in a 10 x 2 factorial scheme, totaling 20 treatments, with five replications. Each experimental unit was represented by a plastic pot containing 8.0 L of nutrient solution and a plant in each pot. Plants were evaluated, at 19 days after transplanting, for leaf number (NFO), stem diameter (DCA), length of the main branch (CRP), length of the root system (CSR), volume of the root system (VSR ), chlorophyll (CLO), ratio of phosphorus content in the root and aerial part P(R/A), total phosphorus (PTO), dry matter ratio in the root and aerial part MS(R/A) and total dry matter (MST). Phosphorus Efficiency (EUP), Phosphorus Acquisition (EAP) and Internal Phosphorus Use (EUTP) were also verified. The data were subjected to analysis of variance (ANOVA) and, then, the grouping of means was performed by the Scott Knott test, where significant responses were obtained. In order to have a better view of the variability between the genotypes, the hierarchical grouping was performed by the UPGMA method from the Mahalanobis distances. The genotypes were classified into groups: Efficient and Responsive (ER), Inefficient and Responsive (IR), Efficient and Non-Responsive (ENR) and Inefficient and Non-Responsive (INR). The analyzes revealed the existence of genetic variability among the genotypes for the aerial part, root system, phosphorus and dry matter variables in the solution without phosphorus restriction (P +) and solution with phosphorus restriction (P-). The P-solution affected plant growth in all genotypes, causing a reduction in NFO, DCA, CRP, VSR, PTO and MST, regardless of the genotype, with the largest reductions observed for MST, PTO, CRP, NFO and VSR, obtaining losses of 77.3; 70.5; 64.8; 60.0 and 47.7%, respectively. On the other hand, the variables CSR, P(R/A) and MS(R / A) were higher in plants in P- solution, with an increase of 50.0; 45.2 and 100%, for CSR, P(R/A) and MS(R/A), respectively. Thus, it is observed that there was an increase in CSR and a reduction in VRS when there is less phosphorus availability. However, CLO was not affected by the of phosphorus effect, since the averages estimated in solutions with and without phosphorus restriction do not differ by the Student's t test (p> 0.05). Higher EUP and EUTP were found in the solution with less phosphorus availability (P-), while the highest EAP was observed in the solution P+. Regarding the EUP, the genotypes, 'GCC' and A-29, were the most efficient in the P+ solution. In situations of low phosphorus content (P-), 'trinity', A-02, A-16, A-29, A-50 and A-52 were the most efficient. Concerning the EAP, in the P + solution, the genotypes ‘vereda’, ‘Aca’, ‘GCC’, ‘trinity’, A-29 and A-52 stood out. In the P- solution, only the 'vereda' stood out. The most efficient genotypes in the EUTP, in the P + solution, were the genotypes 'GCC' and A29, while with less availability, 'trinity', A-02, A-29 and A-52. The genotypes A-16, A-29, A-50, A-52 and ‘trinity’ were classified as efficient and responsive (ER) in the solution with less phosphorus availabilityO estabelecimento de programas de melhoramento genéticos, visando maior eficiência de uso de fósforo, é importante para reduzir o uso de fertilizantes fosfatados e minimizar os efeitos ambientais e econômicos da agricultura. O objetivo do presente trabalho foi avaliar a eficiência de uso de fósforo em genótipos de meloeiros cultivados em sistema de hidroponia. O experimento foi realizado em casa de vegetação da Universidade Federal Rural do Semi-Árido, em Mossoró, Rio Grande do Norte. Avaliando 10 genótipos de meloeiro, sendo cinco cultivares melhorados (vereda, gaúcho redondo conesul (GRC), amarillo canário (Aca), gaúcho casca de carvalho (GCC) e trinity) e cinco não melhorados (A-02, A-16, A-29, A-50 e A-52), que foram submetidos a duas soluções nutritivas (S1 - solução nutritiva sem restrição de fósforo (P+) e S2- solução nutritiva com restrição de fósforo (P-)). O delineamento experimental adotado foi em blocos casualizados, em esquema fatorial 10 x 2, totalizando 20 tratamentos, com cinco repetições. Cada unidade experimental foi representada de um vaso plástico contendo 8,0 L de solução nutritiva e uma planta em cada vaso. As plantas foram avaliadas, aos 19 dias após o transplantio, quanto ao número de folhas (NFO), diâmetro do caule (DCA), comprimento do ramo principal (CRP), comprimento do sistema radicular (CSR), volume do sistema radicular (VSR), clorofila (CLO), razão do teor de fósforo na raiz e parte aérea P(R/A), fósforo total (PTO), razão da matéria seca na raiz e parte aérea MS(R/A) e matéria seca total (MST). Verificou-se também a Eficiência de Uso de Fósforo (EUP), de Aquisição de Fósforo (EAP) e Utilização Interna de Fósforo (EUTP). Os dados foram submetidos as análises de variância (ANOVA) e, em seguida, procedeu o agrupamento de médias pelo teste de Scott Knott, onde foram obtidas respostas significativas. Para se ter melhor visão da variabilidade entre os genótipos, realizou-se o agrupamento hierárquico pelo método UPGMA a partir das distâncias de Mahalanobis. Os genótipos foram classificados em quadro grupos: Eficientes e Responsivos (ER), Ineficientes e Responsivos (IR), Eficientes e Não Responsivos (ENR) e Ineficientes e Não Responsivos (INR). As análises revelaram existência de variabilidade genética entre os genótipos para as variáveis da parte aérea, do sistema radicular, fósforo e matéria seca na solução sem restrição de fósforo (P+) e solução com restrição de fósforo (P-). A solução P- afetou o crescimento das plantas em todos os genótipos, provocando redução no NFO, DCA, CRP, VSR, PTO e MST, independente do genótipo, sendo as maiores reduções observadas para MST, PTO, CRP, NFO e VSR, obtendo-se perdas de 77,3; 70,5; 64,8; 60,0 e 47,7%, respectivamente. Por outro lado, as variáveis CSR, P(R/A) e MS(R/A) foram maiores nas plantas em solução P-, ocorrendo aumento de 50,0; 45,2 e 100%, para CSR, P(R/A) e MS(R/A), respectivamente. Assim, observase que houve aumento no CSR e redução do VSR quando há menor disponibilidade de fósforo. No entanto, a CLO não foi afetada pelo efeito de fósforo, uma vez que as médias estimadas nas soluções com e sem restrição de fósforo não diferem entre si pelo teste t de Student (p>0,05). Verificou-se maior EUP e EUTP na solução com menor disponibilidade de fósforo (P-), enquanto a maior EAP foi observada na solução P+. Com relação à EUP, os genótipos , ‘GCC’ e A-29, foram os mais eficientes na solução P+ . Em situação de baixo teor de fósforo (P-), ‘trinity’, A-02, A-16, A-29, A-50 e A-52 foram os mais eficientes. Concernente à EAP, na solução P+, destacaramse os genótipos ‘vereda’, ‘Aca’, ‘GCC’, ‘trinity’, A-29 e A-52. Na solução P-, sobressaíram-se apenas o ‘vereda’. Os genótipos mais eficientes na EUTP, na solução P+, foram os genótipos ‘GCC’ e A-29, enquanto com menor disponibilidade, ‘trinity’, A-02, A-29 e A-52. Os genótipos A-16, A-29, A-50, A-52 e ‘trinity’ foram classificados em eficientes e responsivos (ER) na solução com menor disponibilidade de fósforoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPE
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
Ativistas influenciadoras : aspectos do reconhecimento datificado das trabalhadoras domésticas no Instagram
Full text linkOrientadora: : Profª. Dra. Kelly Cristina de Souza PrudencioTese (doutorado) - Universidade Federal do Paraná, Setor de Artes, Comunicação e Design, Programa de Pós-Graduação em Comunicação. Defesa : Curitiba, 06/08/2024Inclui referênciasResumo: Esta pesquisa investiga a relação entre um tipo de ativismo feito a partir da mediação das plataformas de redes sociais e mulheres que atuam ou atuaram no trabalho doméstico. O objetivo central é compreender como se dá a politização desse tema, a partir do reconhecimento dos sujeitos, das demandas e da interação midiática limitada pelas redes sociais. A perspectiva teórica da tese costurou as relações que se estabelecem entre as demandas por reconhecimento e os novos fluxos de comunicação. Embora o ativismo nas redes sociais digitais seja bem documentado pela literatura, as iniciativas individuais não recebem a mesma atenção. A metodologia foi construída para tentar abarcar a fluidez e múltiplas interações. Assim, o percurso foi realizado a partir de métodos mistos, uso de softwares, análise temática das postagens e entrevistas semi-estruturadas com as ativistas. Na primeira etapa, mapeamos os perfis relacionados ao trabalho doméstico no Instagram. Na sequência coletamos as postagens e comentários para serem analisados à luz da teoria. Em seguida, utilizamos o instrumento da entrevista episódica semi-estruturada para acessar questões relevantes a partir das perspectivas particulares das criadoras das páginas: "Eu, empregada doméstica", "Ela é só a babá", "Faxina Boa" e "Isa_Benevides". As conclusões do estudo permitem indicar o surgimento de uma categoria de ativistas influenciadoras que mesclam essas atividades de forma não dicotômica. As mulheres possuem diversas formas de agir e de interferir na arena pública digital, com narrativas contestadoras do estigma e das condições subalternas, mas que também propõem novos olhares a partir das construções individuais dos sujeitos dentro das limitações que o Instagram impõeAbstract: This research investigates the relationship between a type of activism carried out through the mediation of social media platforms and women who work or have worked in domestic work. The main objective is to understand how the politicization of this issue occurs, based on the recognition of the subjects, the demands and the media interaction limited by social media. The theoretical perspective of the thesis has woven together the relationships that are established between the demands for recognition and the new communication flows. Although activism on digital social media is well documented in the literature, individual initiatives do not receive the same attention. The methodology was constructed to attempt to encompass fluidity and multiple interactions. Thus, the route was carried out using mixed methods, the use of software, thematic analysis of posts and semi-structured interviews with activists. In the first stage, we mapped the profiles related to domestic work on Instagram. Next, we collected the posts and comments to be analyzed in light of the theory. We then used the semi-structured episodic interview instrument to access relevant issues from the particular perspectives of the creators of the pages:"Eu, emprega doméstica, Ela é só a babá","Faxina Boa" and "Isa_Benevides.The conclusions of the study indicate the emergence of a category of activist influencers who combine these activities in a non-dichotomous way. Women have different ways of acting and intervening in the digital public arena, with narratives that challenge stigma and subaltern conditions, but which also propose new perspectives based on the individual constructions of the subjects within the limitations that Instagram impose
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
"Quase família" : o reconhecimento ideológico no enquadramento noticioso da PEC das Domésticas
Full text linkOrientadora: Profª. Drª. Kelly PrudencioDissertação (mestrado) - Universidade Federal do Paraná, Setor de Artes, Comunicação e Design, Programa de Pós-Graduação em Comunicação. Defesa : Curitiba, 28/02/2020Inclui referências: p. 97-101Resumo: O objetivo principal deste estudo é compreender como os portais on-line do Estado de S. Paulo e Folha de S. Paulo direcionaram o debate sobre a regulamentação do emprego doméstico no Brasil, entre os anos de 2012 e 2016. Observamos as notícias, sobre a luta por reconhecimento das trabalhadoras, utilizando a análise de enquadramento multimodal proposto por Wosniak et al. (2014) em que se examinam os elementos textuais, narrativos e visuais. Essa discussão se relaciona com o conceito de "homem cordial" de Sérgio Buarque de Holanda (1995) que busca, nas raízes do Brasil colonial, uma explicação para as relações personalistas entre patrões e empregados. Entre os anos de 2012 e 2016, as empregadas domésticas tiveram importantes conquistas ligadas à área do Direito. No entanto, a Lei Complementar nº 150/2015 foi alvo de disputas políticas para a flexibilização dos novos direitos em favorecimento aos patrões. Esta pesquisa compreende um corpus de 224 matérias e os resultados mostram que os veículos possuem uma visão funcional e economicista do vínculo de trabalho. Os enquadramentos dos portais abordam a "PEC das domésticas" como um problema para os empregadores, que passaram a ter mais dificuldades para manter "suas" domésticas. Defendemos que os discursos midiáticos contribuem para a legitimidade da subordinação ao reduzirem o conflito como uma questão de aumento de despesas dos patrões. Além disso, as domésticas não falam por si mesmas, precisam da tutela de seus empregadores ou representantes (advocates), o que as mantêm na subalternidade, restando-lhes apenas a condescendência de seus "protetores". Palavras-chave: Reconhecimento ideológico. Trabalho doméstico. Enquadramento multimodal.Abstract: The main objective of this study is to understand how the online portals of the Estado de S. Paulo and Folha de S. Paulo directed the debate on the regulation of domestic employment in Brazil, between the years 2012 and 2016. We watch the news, about the struggle for recognition of female workers, using the multimodal framing analysis proposed by Wosniak et al. (2014) in which the textual, narrative and visual elements are examined. This discussion is related to the concept of "cordial man" by Sérgio Buarque de Holanda (1995) who seeks in the roots of colonial Brazil an explanation for the personalist relations between bosses and employees. In fact, during the period studied, domestic servants had important achievements related to the area of Law. However, Complementary Law No. 150/2015 was the target of political disputes to make the new rights more flexible in favor of employers. This research comprises a corpus of 224 news and the results show that the vehicles have a functional and economical view of the employment relationship. The news frames of the portals approach the "PEC of the housekeepers" as a problem for employers, who started to have more difficulties to maintain "their" housekeepers. We argue that media discourses contribute to the legitimacy of subordination by reducing the conflict as a matter of increasing the boss's expenses. In addition, domestic workers do not speak for themselves, they need the protection of their bosses or representatives (advocates), which keeps them in the subordinate, leaving them only the condescension of their "protectors". Keywords: Ideological recognition. Housework. Multimodal framing
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
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