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Search Results: 1 - 10 of 2066 matches for " Cuevas Becerra "
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EFECTO DE LA MATERIA ORGáNICA Y EL MANEJO SOBRE LA HIDROFOBICIDAD DE SUELOS VOLCáNICOS
Cuevas Becerra,José;
Revista de la ciencia del suelo y nutrición vegetal , 2006, DOI: 10.4067/S0718-27912006000200002
Abstract: soil water repellence or hidrofobicity depends on a strong interaction among the mineral and organic soils fractions. the content of organic matter is an determinant factor of water repellence. a positive relationship between the content of organic matter and water repellence can be observed, however, not all organic matter may cause repellence in the soil matrix. more than the amount of organic compounds, the quality characteristics impact the hidrofobicity of soil. it is possible to find two types of repellencies:) natural and induced one. the repellence influence the magnitude of intermolecular electrical forces which act in the interface of solid-liquid-gas. this phenomenon can be evaluated by measuring the contact angle (θ) among these phases. soil management influence water repellency, but this effect is reduced by intense mechanical labor. hidrofobicity influence soil hydraulic characteristic, modifying preferential flows. the aim of this study was: i) determine the soil water repellency in three volcanic soils from southern of chile in combinations with two managements (forest and prairie) and ii) to estimate the buffer capacity by using a hydrophilic compound in the volcanic soils. it was observed different contact angle, attributed to soil characteristics, but with a direct effect of vegetation type which contributed to organic materials top cause repellence in these soils. soils with similar pedogenetic characteristics show different hydrophobic values for the same vegetation (forest or pastures). soils humectation capacity depends of the quality of soil organic matter more than som total content. buffer capacity of soils depended of the amount of som, and its interaction between mineral soil particles.
EFECTO DE LA MATERIA ORGáNICA Y EL MANEJO SOBRE LA HIDROFOBICIDAD DE SUELOS VOLCáNICOS Organic matter and management effect over hydrophobicity in volcanic ash soils
José Cuevas Becerra
Revista de la Ciencia del Suelo y Nutrición Vegetal , 2006,
Abstract: La repelencia al agua o hidrofobicidad de los suelos depende de una fuerte interacción entre las fracciones minerales y orgánicas del suelo. El contenido de materia orgánica condicionara de manera importante el monto de la repelencia, pero no todo el Carbono orgánico es repelente, y mas que el monto total de compuestos orgánicos, son sus características traducidas como calidad de materia orgánica, la que incidirá sobre los montos de hidrofobicidad. Es posible encontrar dos tipos de repelencias, naturales e inducidas. La repelencia se origina por los cambios en las magnitudes de las fuerzas intermoleculares eléctricas que actúan en la interfase de sólido-liquido-gas pudiendo ser evaluada a través del ángulo de contacto (θ) entre estas fases. Existe una relación positiva entonces entre el contenido de materia orgánica y la repelencia. El manejo afecta la repelencia siendo esta menor cuando las solicitaciones mecánicas son mas intensas. La importancia de la hidrofobicidad es que cambia las características hidráulicas de los suelos, provocando la aparición de flujos preferenciales. Los objetivos de esta investigación, fueron determinar las variaciones en la repelencia al agua en tres suelos, originados a partir de depósitos de ceniza volcánica del sur de Chile bajo dos tipos de manejo (Bosque y Pradera) y el uso de un compuesto hidrofílico para estimar la capacidad tampón de los suelos a la hidrofobicidad. Se observó que los suelos analizados muestran valores del ángulo de contacto diferentes, que se atribuyen a las características propias del suelo, pero con un efecto directo del tipo de cubierta vegetal, que a través de aportes de materiales orgánicos y la interacción que se establezca con el suelo a nivel de agregados. Así suelos con igual material generador, muestran valores distintos de hidrofobicidad para condiciones de manejo y cubiertas vegetales similares. De manera que, la capacidad de humectación de los suelos depende en mayor medida de la calidad de materia orgánica que de su contenido total. Y la interacción entre las partículas de suelo y los componentes orgánicos. Soil water repellence or hidrofobicity depends on a strong interaction among the mineral and organic soils fractions. The content of organic matter is an determinant factor of water repellence. A positive relationship between the content of organic matter and water repellence can be observed, however, not all organic matter may cause repellence in the soil matrix. More than the amount of organic compounds, the quality characteristics impact the hidrofobicity of soil. It is possible t
Construcción del límite no relativista para la ecuación de Dirac a partir de su solución fundamental
A. R. Becerra Becerra
Bistua : Revista de la Facultad de Ciencias Básicas , 2007,
Abstract: Se estudia la solución fundamental de la ecuación de Dirac y sus propiedades, y a partir de ello se obtiene el límite no relativista.
All you need is love: ciudadanía, género y educación en los debates del primer socialismo argentino
Becerra, Marina;
Cadernos Pagu , 2006, DOI: 10.1590/S0104-83332006000200014
Abstract: this work pretends to analyze the socialist strategies for the production of a modern citizenship, during the socialism foundational period (1896-1910), coincident with the moment of basic scholarship in argentine. the investigations about those socialists debates line a special interest for the gender problems because the socialism is one of the political formations that in argentine strongly defended the feminine emancipation and very early impelled the production of a modern citizenship for both sexes.
Metáforas en Lengua de Se?as Chilena
Becerra,Carolina;
Psykhe (Santiago) , 2008, DOI: 10.4067/S0718-22282008000100005
Abstract: the present study examined the characteristics of chilean deaf people's metaphoric language and its relevance in linguistic comprehension. this key question is based in the scarcity of studies conducted in chile. a qualitative study was developed, on the basis of analysis of videos of chilean deaf people spontaneous sign language. a list of conceptual and no conceptual metaphors in chilean sign language was developed. the comprehension of these metaphors was evaluated in a group of deaf subjets, educated using sign language communication. the results identify the existence of metaphors of the deaf culture. these methaphors would be coherent with the particular experiences of deaf subjets and do not necessarily agree with spoken language.
“Atmosphere”, a Precursor of “Cognitive Schemas”: Tracing Tacit Phenomenological Influences on Cognitive Behaviour Therapy
Rodrigo Becerra
Indo-Pacific Journal of Phenomenology , 2004,
Abstract: Whilst individuals deal with divergent sorts of stimuli from the environment, they also tend to display some regularity in the way they respond to related patterns. These consistent responses can be conceptualised as cognitive schemas. A paramount component of Cognitive Behaviour Therapy (CBT) is the notion of cognitive schemas as they are a favoured point of therapeutic intervention. CBT as articulated by Beck in the 1960s owes intellectual acknowledgment to Merleau-Ponty and Heidegger and their notions of “atmosphere” and “clearing” respectively. This essay explores the notion of cognitive schema and atmosphere as applied to emotional pathology. It suggests that the well-known influence that phenomenology had on existential psychology could be extended to empirical clinical psychology, like CBT. The strategy adopted in this paper is to use Dreyfus’ ontological and epistemological distinction in psychopathology and then make a similar distinction, albeit using different terminology, in the CBT tradition. Some empirical findings from the literature are examined which render support to the existence of cognitive schemas and their crucial contributory role in the aetiology and maintenance of emotional disorders. It is noted that some of the features of these cognitive schemas were espoused well before Beck by Merleau-Ponty and the phenomenological-existential tradition. Indo-Pacific Journal of Phenomenology, Volume 4, Edition 1 July 2004
Differenza sessuale, diritti delle donne e lotte socialiste in Argentina: le proposte di Enrique Del Valle Iberlucea (1877-1921)
Marina Becerra
Storia delle Donne , 2009,
Abstract: Along this work there is an investigation about the argentine socialistic concerning to the feminine rights, inside the frame of the modern citizenship production, at the beginning of the XX century. Particularly there is an analysis of the position of a Spanish socialistic senator –became naturalized argentine– Enrique Del Valle Iberlucea, in the debates about the incorporation of divorce to the Civil Code, project that he had presented in 1918 as a national senator. There is an interest in to find out in what way this radicalized position, original among the masculine voices of this particular epoch, contributed to the criticism of the power relationships between both sexes.
Hipotiroidismo congénito y fenilcetonuria en el ni o
CARLOS BECERRA
Revista chilena de pediatría , 2008,
Abstract:
Rese a de "Movimientos Sociales y Luchas por el Derecho Humano al Agua en América Latina"
Andrea Becerra
Polis : Revista de la Universidad Bolivariana , 2006,
Abstract:
HISTORIA DE LA POLICíA Y DEL EJERCICIO DEL CONTROL SOCIAL EN COLOMBIA
Dayana Becerra
Prolegómenos. Derechos y Valores , 2010,
Abstract: El presente trabajo es una exploración histórica crítica de la institución policial en su función de control social en Colombia hasta el periodo histórico conocido como la regeneración. Para tal efecto, se han estudiado tanto los textos legales, como la realidad social, atinentes a la Policía, entendida en sus dos acepciones: función y estructura institucional. De dicho análisis se constata una gran paradoja: mientras que la mayoría de las competencias asignadas eran de tipo administrativo, dichas atribuciones permitieron una omnipresencia de la Policía como ente de control social más allá de lo estrictamente penal.
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