1,721,837 research outputs found
Diagnose nutricional do eucalipto pelo DRIS, M-DRIS e CND
Full text linkThe evaluation of the nutritional status in eucalypt (Eucalyptus grandis W. Hill ex Maid.) forests through vegetal tissue analyses what reflects water and nutrient flows in the system, and represents a complementary tool to soil analysis can be helpful to raise and maintain the forest productivity at high levels. This study compared the use of the Diagnosis and Recommendation Integrated System (DRIS), Modified-DRIS (M-DRIS), and Compositional Nutrient Diagnosis (CND) diagnose methods in eucalypt stands in Central-Eastern Minas Gerais State, Brazil. Data of productivity and of N, P, K, Ca, and Mg leaf contents in 993 Eucalyptus grandis stands aging between 72 and 153 months, planted on six sites in 3 ´ 2 m spacing, were used. The nutritional status was diagnosed by the DRIS, M-DRIS, and CND methods, and validated by the chi-square (c²) test applied to the nutrients diagnosed as primary limiting by deficiency. These three methods were compared to each other based on the diagnosis concordance frequency (DCF) derived from the fertilization response potential (FRP) by the criteria considering each nutrient separately; from all (5) to none (0); and only the primary limiting nutrients by either deficiency or excess. The diagnosis concordance level among the methods was procedure-dependent, and varied according to the nutrient concentration in trees.A avaliação do estado nutricional em florestas de eucalipto (Eucalyptus grandis W. Hill ex Maid.), mediante análises de tecido vegetal, pode ser importante para elevação e manutenção em níveis elevados da produtividade florestal, pois, reflete os fluxos de água e de nutrientes no sistema, sendo ferramenta complementar à análise de solo. O presente trabalho foi realizado aplicando-se o Sistema Integrado de Diagnose e Recomendação (DRIS), DRIS modificado (M-DRIS) e Diagnose da Composição Nutricional (CND), com o objetivo de comparar as diagnoses realizadas entre os métodos DRIS, M-DRIS e CND para o eucalipto, em localidades da região Centro-Leste de Minas Gerais. Foram utilizados dados de produtividade e dos teores de N, P, K, Ca e Mg nas folhas, referentes a 993 talhões de Eucalyptus grandis com idades variando de 72 a 153 meses, plantados no espaçamento 3 ´ 2 m em seis localidades dessa região. A diagnose do estado nutricional foi realizada utilizando-se o DRIS, M-DRIS e CND e validada pelo teste do qui-quadrado (c²), aplicado àqueles nutrientes diagnosticados como limitantes primários por deficiência. Os métodos foram comparados, baseando-se na freqüência de diagnoses concordantes (DCF) do potencial de resposta à adubação (FRP), mediante os seguintes critérios: considerando-se os nutrientes separadamente; desde todos (5) nutrientes até nenhum (0); e apenas o limitante primário por deficiência e por excesso. O nível de concordância entre as diagnoses, fornecidas pelos métodos, variou de acordo com o procedimento adotado em sua avaliação e com o grau de concentração de nutrientes nas árvores
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
Diagnóstico nutricional mediante el uso del dris modificado (dris-m) en huertos de naranjo en el Estado Yaracuy, Venezuela Nutritional diagnosis of orange orchards in Yaracuy State by using the modified DRIS (DRIS-M)
No full textLa fertilización del naranjo en Venezuela se ha realizado principalmente de forma empírica o basada en análisis de suelos. Sin embargo, estos procedimientos no consideran todos los factores que afectan la absorción de nutrientes, generándose desbalances nutricionales que desmejoran el rendimiento y calidad de los frutos. En este trabajo se determinó el estado nutricional de huertos de naranjo en las cuatro principales zonas citrícolas del estado Yaracuy (Aroa, Durute, Nirgua y Yumare) mediante el análisis y diagnóstico DRIS-M de 192 muestras, y posterior comparación con los análisis de suelo. Se obtuvo que la principal limitación nutricional es la deficiencia de fósforo, seguida por el exceso de nitrógeno, la deficiencia de cinc y el exceso de hierro, en ese orden. El potasio, magnesio, calcio y cobre se encontraron generalmente en proporciones adecuadas. En Aroa se presentaron deficiencias de cobre y manganeso, y sólo de manganeso en Nirgua. Se encontraron algunas diferencias entre los diagnósticos nutricionales de las cuatro zonas evaluadas. En el trabajo se sugieren posibles causas de los diagnósticos establecidos.The fertilization of orange trees in Venezuela has been accomplished mainly by empirical forms or based in soil analysis. However, these procedures do not take into account all factors that affect nutrients absorption, and originate nutritional imbalances that may impair yield and quality of the fruits. In this research, the nutritional status of orange tree orchards located in the four main citrus zones of Yaracuy State (Aroa, Durute, Nirgua y Yumare) by analysis and DRIS-M diagnostic of 192 foliar samples, and later comparison with soil analysis. It was found that the main nutritional limitation is the phosphorus deficiency, followed by nitrogen excess, zinc deficiency, and iron excess. Potassium, magnesium, calcium and copper were generally in suitable proportions. Deficiencies of copper and manganese were found in Aroa, and only manganese in Nirgua. Some differences among the nutritional diagnoses of the four studied zones were detected. Possible causes of this diagnosis are discussed in the paper
DIAGN 3STICO NUTRICIONAL MEDIANTE EL USO DEL DRIS MODIFICADO (DRIS-M) EN HUERTOS DE NARANJO EN EL ESTADO YARACUY, VENEZUELA
Full text linkLa fertilizaci\uf3n del naranjo en Venezuela se ha realizado principalmente de forma emp\uedrica o basada en an\ue1lisis de suelos. Sin
embargo, estos procedimientos no consideran todos los factores que afectan la absorci\uf3n de nutrientes, gener\ue1ndose desbalances
nutricionales que desmejoran el rendimiento y calidad de los frutos. En este trabajo se determin\uf3 el estado nutricional de huertos
de naranjo en las cuatro principales zonas citr\uedcolas del estado Yaracuy (Aroa, Durute, Nirgua y Yumare) mediante el an\ue1lisis y
diagn\uf3stico DRIS-M de 192 muestras, y posterior comparaci\uf3n con los an\ue1lisis de suelo. Se obtuvo que la principal limitaci\uf3n
nutricional es la deficiencia de f\uf3sforo, seguida por el exceso de nitr\uf3geno, la deficiencia de cinc y el exceso de hierro, en ese
orden. El potasio, magnesio, calcio y cobre se encontraron generalmente en proporciones adecuadas. En Aroa se presentaron
deficiencias de cobre y manganeso, y s\uf3lo de manganeso en Nirgua. Se encontraron algunas diferencias entre los diagn\uf3sticos
nutricionales de las cuatro zonas evaluadas. En el trabajo se sugieren posibles causas de los diagn\uf3sticos establecidos.
ABSTRACT
Nutritional diagnosis of orange orchards in Yaracuy State by using the modified DRIS (DRIS-M)
The fertilization of orange trees in Venezuela has been accomplished mainly by empirical forms or based in soil analysis. However,
these procedures do not take into account all factors that affect nutrients absorption, and originate nutritional imbalances that may
impair yield and quality of the fruits. In this research, the nutritional status of orange tree orchards located in the four main citrus
zones of Yaracuy State (Aroa, Durute, Nirgua y Yumare) by analysis and DRIS-M diagnostic of 192 foliar samples, and later
comparison with soil analysis. It was found that the main nutritional limitation is the phosphorus deficiency, followed by nitrogen
excess, zinc deficiency, and iron excess. Potassium, magnesium, calcium and copper were generally in suitable proportions.
Deficiencies of copper and manganese were found in Aroa, and only manganese in Nirgua. Some differences among the
nutritional diagnoses of the four studied zones were detected. Possible causes of this diagnosis are discussed in the paper
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
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
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