1,721,097 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
Avaliação de linhagens de milho para produção de híbridos para silagem
Full text linkOrientador: Prof. Dr. Clóves Cabreira JobimCorientador: Prof. Dr. Carlos Alberto ScapimDissertação (mestrado em Zootecnia) - Universidade Estadual de Maringá, 2017RESUMO: Objetivou-se avaliar linhagens de milho quanto aos caracteres agronômicos, bromatológicos da forragem verde e da silagem e qualitativos da silagem, visando identificar materiais potencialmente superiores para produção de silagem de alta qualidade. O delineamento foi em látice simples parcialmente balanceado (9x9) com 81 tratamentos (72 linhagens e 9 híbridos comerciais como testemunhas). As médias foram agrupadas e aplicada a correlação de Pearson em relação às características agronômicas (rendimento de grãos, rendimento de matéria verde, rendimento de matéria seca, altura da planta, altura da espiga e diâmetro de colmo), fracionamento de plantas (teores de colmo, folha, brácteas e grãos+sabugo), composição química da forragem e da silagem e avaliações qualitativas da silagem (digestibilidade "in vitro" da matéria seca e degradabilidade "in situ" em tempo de 24 horas). Para as características agronômicas, os 9 híbridos comerciais testemunhas apresentaram maiores valores. Para as características de fracionamento de planta, o grupo 3 contendo 14 genótipos apresentou as melhores proporções de folhas, colmo e grãos+sabugo. O grupo 6 (4 genótipos) apresentou o melhor conjunto para as características bromatológicas. O rendimento de grãos apresentou alta correlação, positiva ou negativa, com os parâmetros quantitativos e qualitativos das linhagens de milho. Para altura da planta e da espiga houve correlação negativa com o FDN da planta (r= -0,40 e r= -0,29) e as frações FDN e FDA tiveram correlação negativa com o rendimento de MS (r= -0,62 e r= -0,47, respectivamente). Houve alta correlação positiva do FDN da forragem com o FDN e FDA da silagem (r= 0,43 e r= 0,71, respectivamente). O FDN da forragem verde (FDNf) e o FDN da silagem (FDNs) tiveram correlação negativa e significativa com a DIVMS (r= -0,61 e r= -0,53, respectivamente). As silagens dos grupos 2, 5 e 6 tiveram DIVMS mais altas (74,90; 72,51 e 73,74%, respectivamente). Os teores de MS, MM, EE e PB da planta se mostraram adequados para obtenção de uma boa silagem, destacando o grupo 6 que apresentou 10,23% de PB. As silagens dos genótipos dos grupos 5 e 6 dentre os grupos pré selecionados (2, 5 e 6) mostrou melhores teores de FDN e FDA. A variabilidade dos genótipos de milho indica uma possibilidade de seleção em programas de melhoramento genético e conclui-se que é possível selecionar os materiais de milho para silagem pelo teor de fibra em detergente neutro da planta.ABSTRACT: Our objective was to evaluate maize lines in relation the agronomic, bromatological characteristics of the forage and silage and qualitative characteristics of the silage, in order to identify potentially superior materials for the production of high quality silage. Design was in a partially equilibrated (9x9) simple lattice with 81 treatments (72 lines and 9 commercial hybrids as controls). Agronomic characteristics (grain yield, green matter yield, dry matter yield, plant height, ear height and stem diameter), fractionation of plants (stem, leaf, bracts and grain + cob), bromatological composition of forage and silage and qualitative characteristics of silage (in vitro digestibility of dry matter and in situ degradability in 24 hour time) were analyzed. Pearson correlations were to evaluated between these characteristics. The 9 commercial hybrids showed higher values for the agronomic characteristics. The group 3 containing 14 genotypes presented the best proportions of the leaves, stem and grain + cob fractions for the plant fractionation characteristics; while for the bromatological composition the group 6 (4 genotypes) presented the best set. Grain yield showed a high correlation, positive or negative, with the quantitative and qualitative parameters of maize lines. For plant and ear height was a negative correlation with NDF of plant (r= -0.40 and r= -0.29) and NDF and ADF fractions had a negative correlation with MS yield (r= -0.62 and r= -0.47, respectively). There was a high positive correlation between to NDF of plant and NDF and DM of silage (r= 0.43 and r= 0.71, respectively). The NDF of forage (NDFf) and NDF of silage (NDFs) had negative and significant correlation with IVDMD (r = -0.61 and r = -0.53, respectively). The silages of groups 2, 5 and 6 showed the highest DIVMS (74.90; 72.51 and 73.74%, respectively). The DM, MM, EE and CP of plant were adequate to produce a good silage, especially in group 6, which presented 10.23% CP. The silages of the genotypes of the groups 5 and 6, among the pre-selected groups (2, 5 and 6), showed better NDF and ADF levels. The variability of maize genotypes indicates a possibility of selection in breeding programs and would possible to select the different corn lines for silage by the neutral detergent fiber content of the plant.xiii, 56 f. : il. color., figs
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
Predicción del efecto de cultivares de algodón en la presencia de interacción genotipo-ambiente.
No full textDispelling 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
Predicción de valores genéticos del efecto de poblaciones de maíz evaluadas en Brasil y Paraguay
No full textThe aim of this study was to evaluate the performance of seven popcorn
( Zea mays L. ) populations of Avati Pichinga landrace, established in
different sites of Brazil and Paraguay, determining and analyzing the
empirical best linear unbiased predictor (EBLUP) of population effect,
and estimating covariance parameters by the restricted maximum
likelihood (REML) method, for commercial and agronomic characteristics.
Ten models were investigated for fitting an appropriate inter-genotype
covariance structure. Akaike and Bayesian information criteria were
used to compare alternative models. The covariance structures chosen
were Toeplitz with three bands, for grain yield; Toeplitz with two
bands for both popping expansion and plant height; autoregressive for
ear height; and variance component for blooming. Population effect was
significant for all the agronomic traits, unlike genotype-environment
interaction. Spearman correlation coefficients were not significant
between grain yield and popping expansion ranking. P4 and P5 can be
considered as promissory populations according to their predicted
breeding values for grain yield; P1 and P4 for popping expansion. These
populations can be regarded as useful for popcorn breeding programs.El objetivo de este estudio fue evaluar el comportamiento de siete
poblaciones de maíz ( Zea mays L. ) tipo roseta, o palomita, de
la raza Avati Pichinga, establecidas en diferentes localidades de
Brasil y Paraguay. Se determinó la mejor predicción lineal no
sesgada empírica (EBLUP), con estimaciones de parámetros de
covarianza vía método de máxima verosimilitud
restringida (REML), en características de importancia comercial y
agronómica. Se investigaron diez modelos con diferentes
estructuras de covarianzas en la matriz intergenotípica. Los
criterios de información de Akaike y Bayesiano de Schwarz se
utilizaron para la comparación entre los modelos. Las estructuras
de covarianza escogidas fueron Diagonal de tres bandas para el
rendimiento de granos, Diagonal de dos bandas para la capacidad de
expansión y la altura de planta, Auto-regresiva de primer orden
para la altura de mazorca, y tipo componentes de varianza para la
floración masculina. El efecto de poblaciones fue significativo,
al contrario de la interacción genotipo-ambiente. Correlaciones de
Spearman fueron no significativas entre rendimiento y capacidad de
expansión. Las poblaciones P4 y P5 se ven promisorias al
considerar su valor genético del rendimiento, y P1 y P4 para
capacidad de expansión. Tales poblaciones pueden ser consideradas
útiles para el programa de mejoramiento
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