1,720,968 research outputs found
Determinantes de la adopción de tecnología de riego presurizado. El caso del Valle de Tulum, San Juan = Determinants of the adoption of pressurized irrigation technology. The case of the Tulum Valley, San Juan
No full textLa producción agrícola bajo riego en zonas áridas requiere una gestión eficiente en el uso de los recursos para garantizar la sostenibilidad del sistema. Por este motivo, es crucial comprender las decisiones en torno al uso y manejo del agua, la energía, la producción y los sistemas de riego. Este trabajo empírico analiza los factores que influyen en la instalación de sistemas de riego presurizado en el Valle de Tulum, San Juan, Argentina, a partir de una muestra de 106 predios mediante un modelo de regresión probit. Se identificaron que las siguientes variables impactaron de forma significativa y positiva: número de integrantes del hogar, nivel educativo, relación superficie regada sobre la superficie total, seguridad en la tenencia de la tierra, disponibilidad de fuentes de energía renovables y almacenamiento de agua intra finca. El estudio aporta a la compresión de la adopción de tecnologías en el medio rural y genera orientaciones relevantes para la política agraria.Irrigated agricultural production in arid areas requires efficient management in the use of resources to ensure the sustainability of the system. For this reason, it is crucial to understand the decisions around water use and management, energy, production and irrigation systems. This empirical work analyzes the factors that influence the installation of pressurized irrigation systems in the Tulum Valley, San Juan, Argentina, based on a sample of 106 farms using a probit regression model. The following variables were identified as having a significant and positive impact: number of household members, educational level, irrigated area/total area ratio, land tenure security, availability of renewable energy sources and intra-farm water storage. The study contributes to the understanding of the adoption of technologies in rural areas and generates relevant guidelines for agricultural policy.EEA San JuanFil: Goti Ayala, Ana Ayelén. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan; ArgentinaFil: Goti Ayala, Ana Ayelén. Consejo Nacional de Investigaciones Científicas; ArgentinaFil: Goti Ayala, Ana Ayelén. Universidad Nacional de San Juan. Facultad de Ingeniería; ArgentinaFil: Roco Fuentes, Lisandro Edgardo. Universidad San Sebastián. Facultad de Economía y Gobierno. Centro de Economía para el Desarrollo Sostenible (CEDES); ChileFil: Andrieu, Jimena. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Juan; ArgentinaFil: Andrieu, Jimena. Universidad Nacional de San Juan. Facultad de Ingeniería; Argentin
Factors influencing the adoption of soil conservation technologies in the rainfed area of Central Chile
No full textEl desarrollo de sistemas agrícolas
sustentables es un desafío en el contexto de
políticas e incentivos tendientes a la conservación
de los recursos naturales, especialmente en zonas
de secano. El presente estudio examina variables
demográficas y productivas que influyen en la
adopción de tecnologías de conservación de suelos
en 90 pequeños productores del secano interior
de Chile Central, en las comunas de Pencahue y
Curepto. Se utilizó un modelo de regresión Probit,
el cual asocia la adopción de las tecnologías con
las variables: edad del agricultor, tamaño familiar,
superficie predial y forma de tenencia de la tierra;
presencia de: plantaciones forestales, invernaderos,
aboneras, animales mayores en el predio;
experiencia en comercialización del productor
y participación en actividades de capacitación.
El modelo seleccionado tiene un alto poder de
predicción, llegando a clasificar correctamente
un 92,2% de las observaciones. Los resultados
econométricos muestran que la participación en
actividades de extensión, la superficie predial, la
presencia de plantaciones forestales y el uso de
aboneras, influyen de manera positiva y significativa
sobre la adopción de tecnologías conservacionistas.
Resulta relevante el impacto de la capacitación
sobre la adopción de tecnologías de alto grado de
inversión, así como la incorporación de prácticas
de conservación de bajo nivel de inversión como
las aboneras.The development of sustainable agricultural
systems is a challenge in the context of policies
and incentives aimed to the conservation
of natural resources, especially in rainfed
areas. This study examines demographic and
productive variables that influence the adoption
of soil conservation technologies (terraces and
infiltration trenches) in 90 small scale farmers
in the rainfed area of Central Chile, at the
municipalities of Pencahue and Curepto. A Probit
regression model was used which associates the
adoption of technologies with the variables such
as: age of farmer, family size, farm size, form
of land tenure; presence of: tree plantations,
greenhouses, composting and animals on
the farm; participation in training activities
and marketing expertise of the producer. The
estimated Probit model has a high predictive
power, reaching up to 92,2% of the correctly
classified observations. The econometrics results
show that the participation in training activities,
the farm size, the presence of forest plantations
and use of compost influence significantly and
positively on the adoption of soil conservation
technologies. The analysis not only reveals a
positive impact of training on the adoption of
high investment conservation practices but also
on the incidence of the simple technologies such
as use of compost.Fil: Roco Fuentes, Lisandro.
Universidad Católica del Maule. Facultad de Ciencias Agrarias y ForestalesFil: Engler Palma, Alejandra.
Universidad Católica del Maule. Facultad de Ciencias Agrarias y ForestalesFil: Jara-Rojas, Roberto.
Universidad de Talc
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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