944 resultados para Al sources


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Fecha: 7-1937 (>1965/70 copia) / Unidad de instalación: Carpeta 45 - Expediente 2-23 / Nº de pág.: 3 (mecanografiadas)

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Fecha: 19-3-1946 (>1970 copia) / Unidad de instalación: Carpeta 45 - Expediente 2-24 / Nº de pág.: 3 (mecanografiadas)

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Contributed to: Fusion of Cultures: XXXVIII Annual Conference on Computer Applications and Quantitative Methods in Archaeology – CAA2010 (Granada, Spain, Apr 6-9, 2010)

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[ES] En este trabajo se pretende estudiar las consecuencias de la orientación al mercado sobre el rendimiento empresarial. En concreto se propone un modelo donde los efectos de la OM sobre la rentabilidad se manifiestan a través de otras variables mediadoras de resultados. La investigación empírica se realiza en el sector de la banca comercial española y se utiliza los modelos de ecuaciones estructurales para la contrastación de las hipótesis propuestas.

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[ES] Para más información véase el trabajo LDGP_mem_003-2: "Estudio topográfico de las deformaciones del conjunto arquitectónico de la iglesia de Nuestra Señora de la Blanca (Agoncillo, La Rioja) [Julio 2007 – Octubre 2009]", http://hdl.handle.net/10810/7050

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Ponencia aceptada y defendida en el XVI Congreso Nacional y XII Hispano-Francés de AEDEM, celebrado en Alicante, en junio de 2002.

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[ES] Son muy diversos los sectores en los que ejercen su actividad las sociedades cooperativas. La sociedad cooperativa de viviendas es una clase específica de dentro de las de consumidores, regulada como una «clase» diferenciada en las leyes, que presenta particularidades que es preciso conocer. Constituyen entidades con un lugar propio dentro del sector inmobiliario con una nada despreciable contribución a la promoción de vivienda. En el País Vasco son en cuantía las más importantes después de las de trabajo asociado. La sociedad cooperativa de viviendas se caracteriza como empresa de participación dentro del sector inmobiliario, en la medida que son los propios usuarios de las viviendas los responsables de la toma de decisiones en la promoción inmobiliaria.

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[Es] Leer textos es una actividad frecuente entre los alumnos universitarios y constituye una exigencia habitual de gran parte del profesorado. Sin embargo, se percibe una queja bastante unánime respecto a las deficiencias que se detectan entre los estudiantes que acceden a la universidad en relación con esta destreza básica, que actúa como soporte de los aprendizajes programados.Desde la convicción de que ignorar esta situación no resuelve sino que agrava el problema, este artículo pretende exponer los resultados de una investigación consistente en diseñar, aplicar y evaluar la eficacia de un plan de intervención para mejorar la comprensión de textos escritos complejos en estudiantes universitarios.

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Background: In plants, nitrate (NO(3)(-)) nutrition gives rise to a natural N isotopic signature (delta(15)N), which correlates with the delta(15)N of the N source. However, little is known about the relationship between the delta(15)N of the N source and the (14)N/(15)N fractionation in plants under ammonium (NH(4)(+)) nutrition. When NH(4)(+) is the major N source, the two forms, NH(4)(+) and NH(3), are present in the nutrient solution. There is a 1.025 thermodynamic isotope effect between NH(3) (g) and NH(4)(+)(aq) which drives to a different delta(15)N. Nine plant species with different NH(4)(+)-sensitivities were cultured hydroponically with NO(3)(-) or NH(4)(+) as the sole N sources, and plant growth and delta(15)N were determined. Short-term NH(4)(+)/NH(3) uptake experiments at pH 6.0 and 9.0 (which favours NH(3) form) were carried out in order to support and substantiate our hypothesis. N source fractionation throughout the whole plant was interpreted on the basis of the relative transport of NH(4)(+) and NH(3). -- Results: Several NO(3)(-)-fed plants were consistently enriched in (15)N, whereas plants under NH(4)(+) nutrition were depleted of (15)N. It was shown that more sensitive plants to NH(4)(+) toxicity were the most depleted in (15)N. In parallel, N-deficient pea and spinach plants fed with (15)NH(4)(+) showed an increased level of NH(3) uptake at alkaline pH that was related to the (15)N depletion of the plant. Tolerant to NH(4)(+) pea plants or sensitive spinach plants showed similar trend on (15)N depletion while slight differences in the time kinetics were observed during the initial stages. The use of RbNO(3) as control discarded that the differences observed arise from pH detrimental effects. -- Conclusions: This article proposes that the negative values of delta(15)N in NH(4)(+)-fed plants are originated from NH(3) uptake by plants. Moreover, this depletion of the heavier N isotope is proportional to the NH(4)(+)/NH(3) toxicity in plants species. Therefore, we hypothesise that the low affinity transport system for NH(4)(+) may have two components: one that transports N in the molecular form and is associated with fractionation and another that transports N in the ionic form and is not associated with fractionation.

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Upward leakage of saline water from an artesian aquifer below 1,500 feet has caused an increase in chloride concentration in the lower Hawthorn aquifer from less than 1,000 mg/1 (milligrams per liter) to values ranging from about 1,300 to 15,000 mg/1. Similarly the higher temperatures of the intruding water has caused an increase in water temperatures in the aquifer from 82"F to values ranging from 83 to 93"F. The intruding water moves upward either through the open bore hole of deep wells or test holes, or along a fault or fracture system, which has been identified in the area. From these points of entry into the lower Hawthorn aquifer, the saline water spreads laterally toward the south and southeast, but is generally confined to components of the fault system. The saline water moves upward from the lower Hawthorn aquifer into the upper Hawthorn aquifer through the open bore hole of wells, which connect the aquifers. This movement has resulted in an increase in chloride from less than 200 mg/1 in the unaffected parts of the upper Hawthorn aquifer to values commonly ranging from about 300 to more than 3,000 mg/1 in parts of the aquifer affected by upward leakage. The upper Hawthorn aquifer is the principal source of ground-water supply for public water-supply systems in western Lee County. Similar effects have been noted in the water-table aquifer, where chloride increased from less than 100 to concentrations ranging from about 500 to more than 5,000 mg/1. This was caused by the downward infiltration of water discharged at land surface from wells tapping the lower Hawthorn aquifer. The spread of saline water throughout most of the McGregor Isles area is continuing as of 1971. (40 page document)

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[ES] Cada destino turístico tiene una marca que puede elegir el consumidor a la hora de viajar. Este trabajo examina, a través de un modelo causal que contrastamos empíricamente para el caso de Mundo Maya-México, el papel que desempeña la reputación, las emociones y la confianza en la intención de compra de los consumidores de un destino turístico.