1,721,006 research outputs found
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
Contribución al estudio de la vulnerabilidad al cambio climático en México /
No full text\ua0tesis que para obtener el grado de Doctor en Geografía presenta Alejandro Ismael Monterroso Rivas ; Directora de tesis Cecilia Conde Álvarez154 páginas :\ua0ilustracionesDoctorado en Geografía\ua0Universidad Nacional Autónoma de México,\ua02012\ua0Programa de Posgrado en Geografí
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
Estrategias de mitigación de CO2 a partir de la respiración del suelo
Get PDFSoil, in addition to storing is a source of CO2 to the atmosphere emitted by soil respiration, mainly due to land use change. The objective of the research was to evaluate soil respiration in different uses and quantify its CO2 emissions at two different times of the year, as well as estimate the storage of this to make a balance to establish strategies that allows with the climate change mitigation. Using a closed dynamic chamber placed on the soil and integrated with an infrared gas analyzer measured the CO2 emission every 30 min, as well as temperature and moisture of the soil with sensors. Three land uses (agroforestry, forestry and agricultural) and two seasons of the year (summer and winter) were analyzed for 24 continuous hours at each site. Positive correlation between ambient temperature and soil respiration was found to exist. The agricultural system stores low carbon content in the soil (50.31 t C ha-1) and emits 9.28 t of C ha-1 in the highest temperature season, in contrast to a natural system that emits 3.98 t of C ha-1 and stores 198.90 t of C ha-1. The balance sheet reflects the need to know CO2 emissions to the atmosphere from soils and not just warehouses. Having scientific support from the ground to the atmosphere is an important step in decision-making that will contribute to climate change mitigation.O solo, além de ser armazenado, é uma fonte de CO2 para a atmosfera emitida pela respiração do solo, principalmente devido à mudança de uso do solo. O objectivo da investigação era avaliar a respiração do solo em diferentes usos e quantificar as emissões de CO2 em dois momentos diferentes do ano, bem como estimar o seu armazenamento para fazer um balanço que permita estabelecer estratégias que ajudem a mitigar as alterações climáticas. Utilizando uma câmara dinâmica fechada colocada no solo e integrada com um analisador de gases infravermelhos, as emissões de CO2 foram medidas a cada 30 minutos, bem como a temperatura e humidade do solo com sensores. Três utilizações da terra (agroflorestação, silvicultura e agricultura) e duas estações (Verão e Inverno) foram analisadas continuamente durante 24 horas em cada local. Verificou-se que existe uma correlação positiva entre a temperatura ambiental e a respiração do solo. O sistema agrícola armazena baixo carbono no solo (50,31 t C ha-1 ) e liberta até 9,28 t C ha-1 na estação de temperaturas mais elevadas, em contraste com um sistema natural que emite 3,98 t C ha-1 e armazena 198,90 t C ha-1. O equilíbrio reflecte a necessidade de conhecer as emissões de CO2 para a atmosfera provenientes do solo e não apenas das instalações de armazenamento. Ter apoio científico do solo para a atmosfera é um passo importante na tomada de decisões que contribuem para a mitigação das alterações climáticas.El suelo, además de almacenar es fuente de CO2 a la atmósfera emitido por la respiración del suelo a causa, principalmente del cambio de uso del suelo. El objetivo de la investigación fue evaluar la respiración del suelo en diferentes usos y cuantificar las emisiones de CO2 en dos diferentes momentos del año, así como estimar el almacén de este para hacer un balance que permita establecer estrategias que ayuden con la mitigación del cambio climático. Mediante una cámara dinámica cerrada colocada en el suelo e integrada con un analizador de gas infrarrojo se midió la emisión de CO2 cada 30 min, así como temperatura y humedad del suelo con sensores. Se analizaron tres usos del suelo (agroforestal, forestal y agrícola) y dos temporadas del año (verano e invierno) durante 24 horas continuas en cada en sitio. Se encontró que existe correlación positiva entre temperatura ambiental y respiración del suelo. El sistema agrícola almacena bajo contenido de carbono en el suelo (50,31 t C ha-1) y libera hasta 9,28 t de C ha-1 en la temporada de mayor temperatura, en contraste con un sistema natural que emite 3,98 t de C ha-1 y almacena 198,90 t de C ha-1. El balance refleja la necesidad de conocer las emisiones de CO2 a la atmósfera por los suelos y no sólo los almacenes. Contar con soporte científico desde la respiración del suelo a la atmósfera es un paso importante para la toma de decisiones que contribuyan a la mitigación del cambio climático
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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