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Search Results: 1 - 10 of 113831 matches for " José Isabel;Livera Mu?óz "
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Erosión del suelo, escurrimiento y pérdida de nitrógeno y fósforo en laderas bajo diferentes sistemas de manejo en Chiapas, México Soil erosion, runoff and nitrogen and phosphorus losses in hillsides as affected by soil management system in Chiapas, Mexico
Robertony Camas Gómez,Antonio Turrent Fernández,José Isabel Cortes Flores,Manuel Livera Mu?óz
Revista mexicana de ciencias agrícolas , 2012,
Abstract: En Chiapas, México, la erosión del suelo es el principal problema que afecta la sustentabilidad de las tierras de ladera. Como resultado, los rendimientos y los ingresos son bajos y la calidad del suelo continúa disminuyendo. Con el objetivo de encontrar alternativas tecnológicas sostenibles, se evaluaron los sistemas: maíz en labranza de conservación (MLC); maíz en barreras de muro vivo (MBMV) y milpa intercalada con árboles frutales (MIAF), en términos del escurrimiento superficial, producción de sedimentos y pérdida de nitrógeno y fósforo en el periodo de junio a noviembre de 2009. Los sistemas se establecieron en microcuencas adyacentes pertenecientes a la cuenca del río Catarina, Jiquipilas, Chiapas. El suelo es un Typic haplustepts, con una pendiente que varía de 30 a 40%. Del total de las precipitaciones, 54% causaron erosión del suelo, y 15% de estos con una precipitación superior a 40 mm 62% de la erosión total. El coeficiente de escurrimiento y la degradación específica de suelo fueron similares y más bajos en las micro cuencas; MIAF (12, 5.8 t ha-1) y MBMV (13, 6.3 t ha-1) que en la microcuenca con MLC (19, 16.8 t ha-1), respectivamente. En el MIAF, el filtro de escurrimiento y la cobertura total proporcionada por el maíz y el frijol durante la mayor parte de la temporada de crecimiento tuvo un papel importante para obtener esos resultados, no obstante que esa microcuenca presentó mayor grado y longitud de pendiente. En cuanto a los nutrientes se determinó una mayor pérdida de nitratos en la microcuenca con el sistema MBMV, posiblemente debido al aporte de nitrógeno por los residuos de la poda de Gliricidia sepium. Respecto a fósforo, el sistema MIAF presentó una pérdida mayor, atribuyéndose a la fertilización fosfórica anual que se realizó a los árboles de guayaba durante tres a os. In Chiapas, Mexico, soil erosion is the main problem affecting the sustainability of hillside lands. As a result, yields and incomes are low, and soil quality continues to decrease. With the aim of finding sustainable technological alternatives, an evaluation was performed on the following systems: maize in conservation tillage (MLC); maize in plant barriers (MBMV) and maize alternated with fruit trees (MIAF), in terms of surface runoff, production of sediments and loss of nitrogen and phosphorous from June to November, 2009. The systems were set up in adjacent microbasins, belonging to the basin of river Catarina, Jiquipilas, Chiapas. The soil is a Typic haplustepts, with a slope that varies between 3 0 and 40%. Out of the total rainfalls, 54% caused soil erosio
Erosión del suelo, escurrimiento y pérdida de nitrógeno y fósforo en laderas bajo diferentes sistemas de manejo en Chiapas, México
Camas Gómez, Robertony;Turrent Fernández, Antonio;Cortes Flores, José Isabel;Livera Mu?óz, Manuel;González Estrada, Adrián;Villar Sánchez, Bernardo;López Martínez, Jaime;Espinoza Paz, Néstor;Cadena I?iguez, Pedro;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: in chiapas, mexico, soil erosion is the main problem affecting the sustainability of hillside lands. as a result, yields and incomes are low, and soil quality continues to decrease. with the aim of finding sustainable technological alternatives, an evaluation was performed on the following systems: maize in conservation tillage (mlc); maize in plant barriers (mbmv) and maize alternated with fruit trees (miaf), in terms of surface runoff, production of sediments and loss of nitrogen and phosphorous from june to november, 2009. the systems were set up in adjacent microbasins, belonging to the basin of river catarina, jiquipilas, chiapas. the soil is a typic haplustepts, with a slope that varies between 3 0 and 40%. out of the total rainfalls, 54% caused soil erosion, 15 % of these with rains of over 40 mm 62% of the total erosion. the runoff coefficient and the specific soil degradation were similar and lower in the micro basins; miaf (12, 5.8 t ha-1) and mbmv (13, 6.3 t ha-1 ) than in the microbasin with mlc (19, 16.8 t ha-1), respectively. in miaf, the runoff filter and total cover provided by maize and bean plants during most of the growth season played an important part in obtaining these results, despite this microbasin presenting a greater slope steepness and length. in regards to the nutrients, there was a greater loss of nitrates in the microbasin with the system mbmv, possibly due to the nitrogen contribution by the leftovers of the pruning ofgliricidia sepium. in regard to phosphorous, the system miaf displayed a greater loss, caused by the yearly phosphoric fertilization performed on the guava trees for three years.
Experiencia en la administración de quimioterapia intraperitoneal en una unidad de diálisis peritoneal Experience in the administration of intraperitoneal chemotherapy in a peritoneal dialysis unit
Ma José Castro Notario,Teresa Luengas Saíz,Ma Victoria Martínez Gordo,Isabel Mu?oz Gutiérrez
Revista de la Sociedad Espa?ola de Enfermería Nefrológica , 2011,
Abstract:
Producción de plántulas de ciclamen (Cyclamen persicum Mill.) en sustratos basados en polvo de bonote de coco
Flores-Almaráz, R.;Livera-Mu?oz, M.;Colinas-León, M. T.;Gaytán-Acu?a, E. A.;Muratalla-Lúa, A.;
Revista Chapingo. Serie horticultura , 2008,
Abstract: as for many ornamental crops in mexico, forest soil and peat moss are commonly used as substrates for cyclamen production. it is important to find substitutes for both to protect forests and to avoid imports of peat moss. cyclamen seedlings emerge 30 days after sowing (das) and usually the percentage of emergence is low. to improve the percentage and time to emergence, this study was carried out to test coconut coir dust (ccd) as a substrate. cyclamen seedlings were produced and the following factors were evaluated: seed soaking (with and without), substrates (peat moss, washed ccd, unwashed ccd and ccd+ peat moss) and genotype (six series) in a factorial treatment combination in a randomized complete blocks design with three replications. soaking seeds 24 hours before sowing did not affect percentage of emergence but did shorten time to seedling emergence by 1.5 and 2.3 days on average in substrates composed of washed and not washed ccd, respectively, and shortens the time to seedling emergence for giant lugano, pannevis? and halios? by 3.7, 1.0 and 1.1 days, respectively. those seedlings that reached establishment emerged before 37 days. the shortest period of time for seedling emergence and the highest percentage of seedling establishment were obtained with substrates having water retention capacity of 75 and 82%. the physical and chemical characteristics of ccd allows its use in formulating substrates for cyclamen seedlings since it has characteristics similar o superior to peat moss or commercial substrates that contain it. differences were found among the studied genotypes in terms of seedling emergence and establishment, growth rate and biomass production.
Evidencia de las diferencias de expectativas en auditoria en mercados bursátiles de reducida dimensión: el caso Portugués
Almeida, Bruno José Machado de;Colomina, Clara Isabel Mu?oz;
Revista Contabilidade & Finan?as , 2008, DOI: 10.1590/S1519-70772008000200009
Abstract: the main goal of this paper is to analyze if, in a small capital market such as the portuguese, the audit expectation gap exits and which are its major components. we have enquired auditors and university accounting and auditing professors regarding several subjects that influence and increase the audit expectation gap. we have also questioned the portuguese users of financial information regarding their perception of the role of today's auditing, to assay their opinion with studies made in anglo-saxon countries. we have reached the conclusion that portuguese financial statements users' expectations are similar to the ones of bigger capital markets. as a matter of fact, fraud is the main cause for the existence of the audit expectation gap, nevertheless, portuguese financial statements users also indicate that the actual auditor's report model in portugal is clearly insufficient to comprehend the objectives and work that auditors have done to reach their conclusions.
Avances en la formulación de emulsiones
Mu?oz, José,Alfaro, María del Carmen,Zapata, Isabel
Grasas y Aceites , 2007,
Abstract: This review emphasizes that formulation, along with processing, defines the microstructure of emulsions and therefore their functional properties. Possible components of both the oil and aqueous phases are described as well as their relevant properties concerning emulsions. The general characteristics of low molecular and high molecular weight emulsifiers, which essentially are adsorbed on the oil/water interfaces, are described. Synthetic emulsifiers derived from the oil industry, as well as those stemming from edible raw materials and biotechnological sources are considered. The main steps of the emulsifying mechanism using proteins and the role of synthetic polymers as well as polysaccharides as stabilizers are discussed. In addition, the formation of protein-polysaccharide complexes as a way of optimizing emulsion formulations is analyzed. Finally, this review points out that the progress in emulsion formulation must rely on the product engineering approach, which involves a multidisciplinary methodology. Esta revisión destaca que la formulación, junto con el procesado, definen la microestructura de las emulsiones, y por tanto sus propiedades funcionales. Se describen los componentes de las fases oleosa y acuosa, así como sus principales propiedades en relación con las emulsiones. Se estudian los emulsionantes, que ocupan básicamente la interfase aceite-agua, distinguiendo entre los de bajo y alto peso molecular, así como entre sintéticos derivados del petróleo, otros que se pueden obtener a partir de materias primas comestibles y de origen biotecnológico. Se resumen las etapas claves que sufren las proteínas como emulsionantes y las condiciones en que polímeros sintéticos y polisacáridos actúan cono estabilizantes. Se aborda también la formación de complejos proteína-polisacáridos como una vía de optimización de formulaciones. Se finaliza destacando que los progresos en formulación de emulsiones deben basarse en la ingeniería del producto y en metodologías multidisciplinares.
EVIDENCE OF THE AUDIT EXPECTATION GAP IN SMALL STOCK MARKETS: THE PORTUGUESE CASE EVIDENCIA DE LAS DIFERENCIAS DE EXPECTATIVAS EN AUDITORIA EN MERCADOS BURSáTILES DE REDUCIDA DIMENSIóN: EL CASO PORTUGUéS
Bruno José Machado de Almeida,Clara Isabel Mu?oz Colomina
Revista Universo Contábil , 2008,
Abstract: The main goal of this paper is to analyze whether, in a small capital market such as that in Portugal, the audit expectation gap exits and which are its major components. We have enquired from auditors, University accounting and auditing professors regarding several subjects that influence and increase the audit expectation gap. We have also questioned the Portuguese users of financial information regarding their perception of the role of today’s auditing, to assay their opinion with studies made in Anglo-Saxon countries. El objetivo principal de este artículo es analizar si, en un peque o mercado de capitales como el portugués, existe diferencia de expectativas en auditoría y cuáles son sus principales componentes. Hemos inquirido a auditores y a profesores universitarios de contabilidad y auditoria en lo que se refiere a numerosos temas que influyen sobre la diferencia de expectativas en auditoría y la aumentan. También hemos consultado a usuarios portugueses de información financiera sobre su visión del rol actual de la auditoría para confrontar su opinión con estudios realizados en países anglosajones.
De la disponibilidad a la didáctica léxica
Francisco José Rodríguez Mu?oz,Isabel O. Mu?oz Hernández
Tejuelo : Didáctica de la Lengua y la Literatura , 2009,
Abstract: Resumen: El giro decisivo en la ense anza de la lengua, concebida como sistema, a su uso real está condicionado por la incorporación y el aprovechamiento de las nuevas metodologías de investigación lingüística, que dan cuenta de una situación más acorde con la realidad. En la didáctica del léxico de una lengua extranjera, como puede ser el espa ol, se revelan especialmente útiles los resultados que proporcionan las pruebas de disponibilidad léxica. Tras exponer las reflexiones teóricas y los principios metodológicos de que participamos en nuestro estudio, se presenta un análisis de léxico general realizado a partir de un corpus de 400 encuestas de disponibilidad a alumnos de ense anza media, de 15 a 18 a os de edad, recogidas entre 1998 y 1999 en Almería capital.Summary: The decisive turn of language teaching, conceived as a system, toward its use is conditioned by the incorporation and the benefit of new methods in linguistic investigation which pay attention to a situation closer to reality. To promote research in lexical didactics of a foreign language, for example of Spanish, the results of lexical availability tests are especially useful. After explaining the theoretical frame and the methodological principles for this study, a general analysis of lexicon is presented. 400 tests of lexical availability were applied to students (15-18 years old) in secondary education, between 1998 and 1999 in the city of Almería.
Crecimiento de plántulas de estátice (Limonium sinuatum) y viola (Viola cornuta) en ambientes contrastantes
Ayala-Garay, Oscar Javier;Carrillo-Salazar, José Alfredo;Hernández-García, Evelia;Díaz-Martínez, Elizabeth;Livera-Mu?oz, Manuel;Almaguer-Vargas, Gustavo;
Revista Chapingo. Serie horticultura , 2011,
Abstract: in order to grow ornamental plants in non-controlled environments, the effect of temperature on seedling emergence and growth must be known in order to optimize plant production. the aim of this research was to compare the growth of statice and viola seedlings, during the winter in the valley of mexico, under three production conditions: a polyethylene-covered tunnel, shade netting that cuts light transmission by 50 %, and in the open. we measured air temperature (0c), emergence percentage (e%), leaf area (la) per plant and dry weight biomass (dwb) per plant at 10, 18, 24, 31 and 35 days after planting (dap) in statice seedlings, and at 21, 28, 35, 43 and 52 dap in viola seedlings. in addition, the absolute growth rate (agr), the relative growth rate (rgr) and the net assimilation rate (nar) were calculated. compared to the outdoor treatment (control), the polyethylene tunnel and shade netting produced higher e% values: 95 and 93 % for statice and 97 and 95 % for viola, respectively. two different sigmoid curves of dry matter accumulation were observed in both species. the polythene tunnel produced higher dwb than the other conditions (p<0.05) with an average temperature of 19.5 0c and high thermal oscillation, but without frost. in the polyethylene tunnel, maximum dwb, la and agr (88 mg·seedling-1, 15.1 cm2seedling-1, and 7.4 mg·d-1, respectively) were observed at 35 dap in statice and 52 dap in viola (43.6 mg·seedling-1, 7.6 cm2 seedlingh and 2.4 mg·d-1, respectively) before transplanting. the polythene cover prevented temperatures below 0 °c, which explains the greater seedling growth in this environment.
Estudio de los procesos hidrológicos de la cuenca del Río Diguillín
Zú?iga,René; Mu?oz,Enrique; Arumí,José Luis;
Obras y proyectos , 2012, DOI: 10.4067/S0718-28132012000100007
Abstract: in the central valley in south-central chile there is a high demand for water resources from the different economical activities as well as from an increasing demand of better environment quality. agriculture is among the main economic activities in this area, which requires ensuring the availability of water resources with a proper planning and management, especially for not normal or mean hydro-meteorological scenarios. for the planning and management of water resources it is necessary to understand the main hydrological processes that predominate in the runoff generation and storage, and to dispose of tools for the estimation of future conditions. in this study a hydrological model for the río diguillín watershed is implemented. the model incorporates a surface water and groundwater connection in the upper part of the watershed to reproduce by a realistic manner the observed behavior in the basin.once the model is calibrated it is able to reproduce past conditions. then, the model is used to evaluate the basin behavior under different scenarios of climate variability caused by el ni?o southern oscillation.
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