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Search Results: 1 - 10 of 341589 matches for " Andrés Fierro álvarez "
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Increasing Water Use Efficiency in Husk Tomato (Physalis ixocarpa Brot) Production in Tabasco, Mexico with Improved Irrigation Water Management  [PDF]
Rutilo López-López, Ignacio Sánchez Cohen, Marco Antonio InzunzaIbarra, Andrés Fierro álvarez, Gerardo Esquivel Arriaga
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.613114
Abstract: Husk tomato production technology was developed utilizing plastic sheeting and drip irrigation based on the results of reference evapotranspiration and crop coefficients (Kc) proposed at different phenological stages. The objectives of this study were as follows: 1) to evaluate the effect of plastic sheeting on the yield of husk tomato fruit with drip irrigation based on crop evapotranspiration; 2) to validate the use of drip irrigation technology and plastic sheeting in husk tomato production using demonstration plots; and 3) to determine the profitability and economic viability of the product in the domestic market. The proposed Kc values were 0.25, 0.71 and 0.56 in the initial, intermediate and final stage of crop development, respectively. Irrigation rates ranged from 2.5 to 6 mm·day-1, which was equivalent to an irrigation time of 0.6 to 2.5 hr. Soil moisture tension was monitored with tensiometers at depths of 15 and 30 cm in a loamy eutricfluvisol. The use of plastic sheeting increased husk tomato yield by 56.2% and water productivity by 63.5% under drip irrigation conditions when basing irrigation levels on crop evapotranspiration. Soil matrix potential varied between depths of 15 and 30 cm based on irrigation or rainfall amounts and the use of plastic sheeting with values being higher when the plastic sheeting was used. The husk tomato fruit yield in validation plots was 46 and 54.6 t·ha-1 with water use efficiencies ranging from 16.1 to 19.1 kg·m-3. These results exceeded the national average of 14 t·ha-1 and water use efficiency of 2.54 kg·m-3. With this new technology, a cost benefit ratio of 3.6 is obtained, which represents an economically profitable margin for farmers in the region.
Acercamiento a las discusiones y proyecciones del Primer Encuentro Interuniversitario de Educación Intercultural
Francisca Fierro Becker,Andrés Donoso Romo
Cuadernos Interculturales , 2008,
Abstract: En abril del a o 2008 cuatro universidades públicas chilenas convocaron a la comunidad universitaria nacional y regional para reflexionar sobre los vínculos entre universidades e interculturalidad en lo que fue el "Primer Encuentro Interuniversitario de Educación Intercultural". Esta actividad, original en cuanto gestión y alcances es relevante pues se perfila como el comienzo de un camino de cooperación en el análisis y tratamiento de estas temáticas al tiempo que se constituye en una demanda en sí misma. Aquí se presentan las principales ideas, discusiones y desafíos que ahí emergieron, en un esfuerzo por aportar a la gestación de futuros diálogos y encuentros.
Early Neoclassical views on Monopoly: the Cournotian heritage
Andrés álvarez
Ecos de Economía , 2010,
Abstract: In spite of Cournot’s unquestionable influence on contemporary theory, his legacy regarding economic policy and, especially, the regulation of monopolies is mostly unknown. In this paper I explore the several forms of Cournot’s analysis of monopolistic market structures, starting with his theoretical model up to his normative and empirical examination. With the help of little known texts of the author I aim at showing the versatility of his ideas and the richness of his analytical legacy. Against this setup I retrace his influence over three of the most important economists of the end of the XIXth century: Walras, Edgeworth and Marshall. I show that there exists a theoretical representation that constitutes the indisputable reference regarding monopolies that is enriched with normative analyses and leads each one of them to their own specific proposals in regulation and economic policy. RESUMEN A pesar de la influencia teórica indiscutible de Cournot sobre la teoría contemporánea, su legado en relación con las políticas económicas y en particular con la regulación de los monopolios es mucho menor. Este trabajo explora las formas diversas que tiene el análisis de las estructuras monopólicas de mercado propuesto por Cournot, partiendo de su modelo teórico hasta su análisis más normativo y empírico. Utilizando textos poco conocidos del autor se pone en evidencia la versatilidad de sus ideas y la riqueza de su legado analítico. A partir de estos elementos se intenta reconstruir la influencia que sus ideas tuvieron sobre tres de los principales autores de finales del siglo XIX: Walras, Edgeworth y Marshall. Se muestra que existe una representación teórica que constituye la referencia indiscutible sobre los monopolios pero que se enriquece en los análisis normativos y resulta en propuestas de regulación y de política económica diversas que cada uno de estos autores desarrolla y se apropia de manera diferente.
Goya, Ramón Bayeu y José del Castillo en los retablos de las iglesias parroquiales de la Puebla de Híjar, Vinaceite y Urrea de Gaén (Teruel)
álvarez Gracia, Andrés
Archivo Espa?ol de Arte , 2002,
Abstract: During the second half of the eighteenth century, the Duke of Hijar renovated, at his own expense, the parish churches of three of his southern Aragonese domains in the towns of Puebla de Hijar, Vinaceite and Urrea de Gaén. For the painting of certain altarpieces, he contracted three important artists from the Court: Francisco de Goya, Ramón Bayeu and José del Castillo. En la segunda mitad del siglo XVIII, el duque de Híjar renovó, con cargo a su peculio, las iglesias parroquiales de tres de sus dominios bajoaragoneses en los pueblos de la Puebla de Híjar, Vinaceite y Urrea de Gaén. Para la pintura de algunos de los retablos contrató a tres importantes pintores de la Corte: Francisco de Goya, Ramón Bayeu y José del Castillo.
Amenazas y ventajas de la ense?anza de la Historia del Pensamiento Económico hoy
álvarez,Andrés; Hurtado,Jimena;
Lecturas de Economía , 2010,
Abstract: this article intends to rebut the arguments against teaching and research in the history of economic thought, thus, highlighting its relevance in the academic formation of future economists. in a moment where economics has been questioned for its inability to provide answers and for its fascination with measurement and technique, we believe it is time to advocate and promote history of economic thought as a field of reflection, criticism and introspection. a field that shows future economists that economics is a process and not a product, providing them with the necessary insights to participate actively in the ''extended present'' of their discipline.
JEAN-JACQUES ROUSSEAU Y KARL MARX: ESTUDIO COMPARATIVO DE DOS CRíTICAS A LA ECONOMíA DE MERCADO
álvarez,Andrés; Hurtado,Jimena;
Revista de Economía Institucional , 2008,
Abstract: we present a comparison between the works of two great critics of the market economy: rousseau and marx. it shows their similarities and divergences, most important of which is the place they give to economic analysis in their intellectual and political theories. whereas marx built his political and scientific criticism on economic analysis, rousseau believed this analysis could not be the starting point for understanding social organization. their monetary theories can explain this difference.
Jean-Jacques Rousseau y Karl Marx: estudio comparativo de dos críticas a la economía de mercado
Andrés álvarez,Jimena Hurtado
Revista de Economía Institucional , 2008,
Abstract: Este trabajo hace una comparación de las teorías monetarias de dos grandes críticos de la economía de mercado: Rousseau y Marx. Muestra sus similitudes y divergencias; entre éstas la más importante es el lugar del análisis económico en sus proyectos intelectuales y políticos. Mientras que Marx fundó su crítica político-científica en el análisis económico, Rousseau pensaba que el análisis económico no podía ser la base para entender la organización social. Sus teorías monetarias pueden explicar esta divergencia.
Editorial
álvarez Gallo Carlos Andrés
Cuadernos de Economía , 2008,
Abstract:
Editorial
álvarez Gallo Carlos Andrés
Cuadernos de Economía , 2008,
Abstract:
USO DE HABITAT DE CUATRO CARNIVOROS TERRESTRES EN EL SUR DE CHILE
Zú?iga,Alfredo; Mu?oz-Pedreros,Andrés; Fierro,Andrés;
Gayana (Concepción) , 2009, DOI: 10.4067/S0717-65382009000200004
Abstract: the process of landscape transformation has been more intense and extended in the central depression of central and southern chile than in the nearby mountain ranges. the original forest cover has almost disappeared; only small fragments persist inserted into a matrix of agroecosystems. this situation may influence the distribution of carnivorous mammals, depending on their degree of habitat specialization and home range size. the goal of this study was to evaluate, through the study of feces dsitribution, the habitat selection of the carnivore assemblage in a fragmented environment in southern chile. we document the selective use of exotic forest plantations of pinus radiata with a scrub understoiy by puma concolor, galictis cuja, and lycalopex griseus. leopardus guigna, despite not showing a statistically significant selection of the native forest, presents a greater number of records in this type of habitat. habitat selection by the predators studied shows a variable degree of use of altered and fragmented environments. surrounding forest plantations present an understoiy of native vegetation, which fits the requirement of most of the carnivores. the levels of spatial overlapping and the adequacy to new environments are discussed.
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