1,721,004 research outputs found
Impact of the abolition of the milk quotas system on the productive structure of dairy cattle farms in the Autonomous Community of Andalusia (Spain)
No full textMilk quotas were introduced in the former European Economic Community in 1984 as a mechanism to prevent overproduction of milk because of support measures for the dairy sector. The quotas system was removed on 1 April 2015. In order to analyse the possible impact of this decision to remove the milk quotas system on dairy farms in Andalusia (Spain), a comparison was made of a time series of the data in the databases of the public administrations. The variables used were dairy production per cow and year, the number of cows per farm and dairy production per farm and year. The period 2010-2019 was considered, establishing two strata: 2010-2014 (period with milk quotas in force) and 2015-2019 (post quotas period). From 2010 to 2019, the number of dairy cattle farms in Andalusia decreased by 29.8 %, milk production increased by 25 % and the average farm size increased by 23 %. During the 2015-2019 period after withdrawal of milk quotas, milk production per cow and year, the number of cows per farm and milk production per farm and year increased significantly (PS
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
La modelización del crecimiento de los cerdos bajo un sistema de cama profunda
Get PDFIn order to evaluate through mathematical models, the productive behavior (growth and consumption) of pigs in a deep bedding system agricultural by-product (rice husk and maize stubble). We used 18 mestizo pigs, raised in individual pens with individual guadua cane (Guadua angustifolia) at a density of 1.20 m2.animal-1, for five months. The variables food consumption and final weight were measured to model growth and consumption. The results show a square root model for growth (R2 =94,11%), while for consumption it adjusts to a double square model (R2 =91,90%). With respect to weight vs consumption, a log-Y model square root-X, allowed the equation of the adjusted model Weight = exp (1,12059 + 1,30298 * sqrt (Consumption)). It is concluded that the non-linear mathematical models presented the best fit to the analyzed data of a deep litter system through the use of their own material resources and agricultural by-products of local crops, contributing to the description of the growth of pigs.Con el fin de evaluar a través de modelos matemáticos el comportamiento productivo (crecimiento y consumo) de cerdos en un sistema de cama profunda con subproductos agrícolas (cascarilla de arroz y rastrojo de maíz). Se utilizaron 18 cerdos mestizos, criados en corrales individuales con caña guadua (Guadua angustifolia) individuales a una densidad de 1,20 m2.animal-1, durante cinco meses. Las variables consumo de alimento y peso final fueron medidas para modelizar el crecimiento y consumo. Los resultados arrojan un modelo raíz cuadrada para el crecimiento (R2=94,11%), mientras que para el consumo ajusta a un modelo doble cuadrado (R2= 91,90%). Con respecto a peso vs consumo, un modelo log- Y raíz cuadrada-X, permitió la ecuación del modelo ajustado Peso = exp (1,12059 + 1,30298*sqrt (Consumo)). Se concluye, que los modelos matemáticos no lineales presentaron el mejor ajuste a los datos analizados de un sistema de cama profunda mediante el empleo de recursos materiales propios y subproductos agrícolas de cultivos locales, contribuyendo a la descripción del crecimiento de los cerdo
Impacto de la desaparición del sistema de cuotas lácteas en la estructura productiva de las explotaciones de vacuno lechero en la Comunidad Autónoma de Andalucía: el Sistema Integral de Gestión de la Ganadería de Andalucía (SIGGAN) como herramienta de toma de decisiones estratégicas
No full textLas cuotas lácteas se implantaron en 1984, en la entonces Comunidad Económica Europea,
como mecanismo para evitar una sobreproducción lechera generada por las medidas de
apoyo al sector lácteo, y han estado vigentes hasta el 1 de abril de 2015.
Para analizar la repercusión de la eliminación de las cuotas lácteas en las explotaciones
lecheras de Andalucía (España), se realizó una base de datos con toda la información sobre el
sector bovino lechero de Andalucía, previamente desagregados, entre los años 2010 y 2019,
integrándose en una sola base de datos a nivel de explotación toda la información sobre
registro de explotaciones ganaderas, cuotas lácteas y entregas de leche.
Se realizó una comparación de la serie temporal de las variables producción lechera por vaca
y año, el número de vacas por explotación y la producción lechera por explotación y año. Se
consideró el periodo 2010-2019, estableciendo dos estratos: 2010-2014 (periodo de vigencia
de las cuotas) y 2015-2019 (periodo post-cuotas). Se analizaron los datos de la serie temporal
2010 a 2015 para determinar los datos cuantitativos correspondientes a la asignación de la
cuota lechera en la comunidad autónoma de Andalucía y el nivel de rebasamiento de cuota.
Así mismo se evaluaron los datos de las explotaciones lecheras de Andalucía para determinar
su evolución desde 2010 a 2019 en lo relativo a número de explotaciones, localización
geográfica, producción lechera total, producción por explotación, número de vacas por
explotación, rangos de producción, censos y principales aspectos de sanidad animal.
Se hizo una caracterización de los titulares de las explotaciones ganaderas de producción
lechera de Andalucía entre 2010 y 2019 en lo relativo a la tipología jurídica, edad y sexo.
Finalmente se analizaron las características de las industrias que recogían leche en Andalucía
y se determinaron la composición en grasa y proteína de la leche entregada en Andalucía y el
precio de la leche pagada a los ganaderos entre los años 2015-2019.
Entre 2010 y 2019 el número de explotaciones de vacuno lechero de Andalucía se redujo un
29,8 %, la producción aumentó un 25 % y el tamaño medio de las explotaciones aumentó un
23 %. En el periodo 2015-2019 tras la retirada de las cuotas, la producción lechera por vaca y
año, el número de vacas por explotación y la producción lechera por explotación y año
aumentaron significativamente (P < 0,05) respecto al periodo previo a la retirada de las
cuotas. En conclusión, el sistema de cuotas lácteas ha tenido una repercusión en la
dimensión y la eficiencia productiva de las explotaciones de vacuno lechero de Andalucía,
registrándose un mayor crecimiento de la producción y del tamaño de las explotaciones
después de retirarse las cuotas en 2015
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
- …
