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Search Results: 1 - 10 of 422691 matches for " Mármol Jiménez "
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Descripción geomorfológica de la cuenca del río Pueblo Viejo, estado Zulia Geomorphological description of the Pueblo Viejo river basin, Zulia State
M Larreal,L Jiménez,W Peters,L Mármol
Revista de la Facultad de Agronomía , 2007,
Abstract: Por medio de la metodología de caracterización geomorfológica utilizada por el MARN, se procedió a la interpretación del área de captación del embalse Burro Negro, en la cuenca del río Pueblo Viejo (estado Zulia), mediante el uso de vistas aéreas e imágenes de satélite, realizando chequeos de verificación en campo. Dada la importancia de esta cuenca en el suministro de agua para la costa oriental del lago de Maracaibo y para la producción agropecuaria bajo riego en su planicie aluvial, se hace necesario el establecimiento de un plan de manejo y conservación de la cuenca alta y media. En la caracterización se identificaron los siguientes paisajes y relieves: Monta a con estructurales en cuestas del terciario (frente y reverso de cuesta), estructurales complejos del terciario (vertientes rectilíneas, rectilíneas convexas, rectilíneas cóncavas y rectilíneas cóncavas-convexas); Valle de acumulación indiferenciada (poca expresión en monta a y mayor expresión en Piedemonte); Piedemonte con sus planos inclinados (conos, terrazas, terrazas basculadas y glacís); Colinar con lomas y colinas (diferente grado de disección); Planicie con llanura aluvial (napas, explayamientos y cubetas) y llanuras cenegosas (ciénagas). Se concluye que más del 40% del área (con relieve monta oso), presenta alta fragilidad ambiental; las áreas planas corresponden a la porción de la cuenca con menor fragilidad y riesgo de degradación ambiental, y en las mismas deben concentrarse los planes de desarrollo agropecuario. Using as reference the MARN methodology for geo morphological survey at 1:50.000, an interpretation of storage area of Burro Negro dam area, Pueblo Viejo river basin (Zulia State) was carried out, using aerial photograph, satellite images and field observation descriptions. Taking into account the importance of this basin for water supplies in Oriental Zone of Maracaibo Lake and for agricultural and livestock production under irrigation in its alluvial plain, it is necessary the establishment of a management and conservation of high and media basin plan. The following landscapes and relief forms were identified: Mountain with Tertiary gradient structures (rectilinear, rectilinear convex, rectilinear concave and rectilinear concave-convex slopes). Valley with undifferentiated sediments (low presence within Mountain, high within "Piedemonte"). "Piedmont" with sloping planes (cones, terraces, burst terraces and glacis). Hills with variable dissection grade, plains with alluvial and marsh (levees basin). Pueblo Viejo river basin represents the harnessing area of the Burro Negr
Evaluación de la erosión hídrica en la microcuenca de las quebradas Roja y Colorada en el municipio Valmore Rodríguez, estado Zulia
Mármol,L; Díaz,J; Larreal,M; Jiménez,L;
Revista de la Facultad de Agronomía , 2007,
Abstract: the soils besides of being the production basement of foods for mankind, plays a main role, next to the vegetable covering, in the hydrological regime of the superficial waters. for that purpose they should be evaluated, to establish the necessary measures that guarantee the basins conservation that will permit to maintaining and/or improving the quantity and the quality of the produced water, as well as to increase the life span of the dams. for these reason a soil erosion survey was carried out in the micro basin of the roja and colorada creeks, located in the pueblo viejo river basin, zulia state, venezuela. aerial photographs were characterized to scale 1:25.000 and the interpretation tones changes and drainage density, in order to classify the study area according to the type and degree of soil water erosion. fields checkups were made to verify the photo interpretation and finally a map of current erosion was generated. results showed the existence of a surface of 872,27 ha (22,24%) without erosion, 371,08 ha (9,46%) with light erosion, 1.908,34 ha (48,66%) with moderate erosion, 707,03 ha (18,04%) with strong erosion and 62,81 ha (1,60%) with severe erosion. we can conclude that land use without considering its capacity is one of the most important factors that promote the erosion in the study area.
Descripción geomorfológica de la cuenca del río Pueblo Viejo, estado Zulia
Larreal,M; Jiménez,L; Peters,W; Mármol,L; Noguera,N;
Revista de la Facultad de Agronomía , 2007,
Abstract: using as reference the marn methodology for geo morphological survey at 1:50.000, an interpretation of storage area of burro negro dam area, pueblo viejo river basin (zulia state) was carried out, using aerial photograph, satellite images and field observation descriptions. taking into account the importance of this basin for water supplies in oriental zone of maracaibo lake and for agricultural and livestock production under irrigation in its alluvial plain, it is necessary the establishment of a management and conservation of high and media basin plan. the following landscapes and relief forms were identified: mountain with tertiary gradient structures (rectilinear, rectilinear convex, rectilinear concave and rectilinear concave-convex slopes). valley with undifferentiated sediments (low presence within mountain, high within "piedemonte"). "piedmont" with sloping planes (cones, terraces, burst terraces and glacis). hills with variable dissection grade, plains with alluvial and marsh (levees basin). pueblo viejo river basin represents the harnessing area of the burro negro dam, human activities especially in the higher part of the basin are threatening its conservation. therefore it is necessary to elaborate a work planning for conservation and management of the medium and high parts of the basin due to this is an extremely important source of water for consumption and for irrigation in eastern zone of zulia state.
Evaluación de la erosión hídrica en la microcuenca de las quebradas Roja y Colorada en el municipio Valmore Rodríguez, estado Zulia Hydric erosion evaluation at the micro basin of Roja and Colorada creeks in the Valmore Rodriguez municipality, Zulia state
L Mármol,J Díaz,M Larreal,L Jiménez
Revista de la Facultad de Agronomía , 2007,
Abstract: El suelo junto a la cobertura vegetal juegan un papel fundamental en el régimen hidrológico de las aguas superficiales, sus evaluaciones permiten establecer medidas que garanticen la conservación de las cuencas. Con la finalidad de establecer áreas críticas sobre las que es necesario aplicar prácticas de conservación de suelos y aguas, se realizó un levantamientos con fines de erosión, la zona de estudio comprende la microcuenca de las quebradas Roja y Colorada, pertenecientes a la cuenca del río Pueblo Viejo, estado Zulia, Venezuela. Se analizaron imágenes aerofotográficas a escala 1:25.000 y se realizó la interpretación de los cambios de tonos y densidad de drenaje, a fin de clasificar el área de estudio de acuerdo al tipo y grado de erosión hídrica presente. Posteriormente se confirmó esta información con los respectivos chequeos de campo y finalmente se generó el mapa de erosión actual. Del presente estudio se concluye que el uso de la tierra sin considerar su capacidad de uso es uno de los factores más importante que promueven la erosión en el área bajo estudio, presentándose 872,27 ha (22,24%) sin erosión, 371,08 ha (9,46%) con erosión ligera, 1.908,34 ha (48,66%) con erosión moderada, 707,03 ha (18,04%) con erosión fuerte y 62,81 ha (1,60%) con erosión severa. The soils besides of being the production basement of foods for mankind, plays a main role, next to the vegetable covering, in the hydrological regime of the superficial waters. For that purpose they should be evaluated, to establish the necessary measures that guarantee the basins conservation that will permit to maintaining and/or improving the quantity and the quality of the produced water, as well as to increase the life span of the dams. For these reason a soil erosion survey was carried out in the micro basin of the Roja and Colorada creeks, located in the Pueblo Viejo river basin, Zulia state, Venezuela. Aerial photographs were characterized to scale 1:25.000 and the interpretation tones changes and drainage density, in order to classify the study area according to the type and degree of soil water erosion. Fields checkups were made to verify the photo interpretation and finally a map of current erosion was generated. Results showed the existence of a surface of 872,27 ha (22,24%) without erosion, 371,08 ha (9,46%) with light erosion, 1.908,34 ha (48,66%) with moderate erosion, 707,03 ha (18,04%) with strong erosion and 62,81 ha (1,60%) with severe erosion. We can conclude that land use without considering its capacity is one of the most important factors that promote the erosion in
Sistemas informáticos aplicados a la matemática actuarial no vida. Un propuesta con R
Claramunt Bielsa, Ma Mercedes,Boj del Val, Eva,Costa Cor, Teresa,Mármol Jiménez, Ma Teresa
Rect@ , 2012,
Abstract: The present work is the result of the investigation realized by the authoresses on programming languages applied to Non Life Actuarial Mathematics (NLAM). The main objective of this paper is to present and to expose the use of the R programming language in NLAM looking at the experience initiated at the University of Barcelona (UB) during 2009-2010. The contribution of the paper consists of the summary and application of libraries realized by different authors on the topics included in NLAM and its improvement with functions of own production. The article includes, for some of the different blocks that are treated inside NLAM at the UB, a small theoretical summary and numerical examples with R, and with real data of insurance portfolios that can be found in basic papers of actuarial science.
Perfil de aminoácidos de la proteína unicelular de kluyveromyces marxianus var. Marxianus.
Páez,Gisela; Jiménez,Eduardo; Mármol,Zulay; Ferrer,José; Sulbarán,Betzabé; Ojeda,Graciela; Araujo,Karelen; Rincón,Marisela;
Interciencia , 2008,
Abstract: the amino acids profile of the single cell protein from kluyveromyces marxianus var. marxianus (atcc 8554) growing in whey as substrate was studied. the bio-processes were carried out by triplicate to ph 5.0, 30°c and 200rpm during 12h in a bioflo? 4000 biorreactor. humidity, lipids and crude protein content of the biomass obtained were measured. for the analysis of the profile of amino acids a liquid chromatograph of high resolution was used. the derivatization of the free amino acids was carried out with phenilisotiocianate. results indicated a crude protein content in k. marxianus of 42.19%. the content of lysin (5.47 ±3.0%) and threonin (15.21 ± 2.6%) in this protein are higher than in wheat flour protein. the amino acid found in the highest amount is glutamic acid, characteristic of unicellular organisms, whereas the methionin is the amino acid obtained in smaller amount. the profile of amino acids obtained shows a reasonable distribution of the content of these in the unicellular protein of k. marxianus in comparison to the international reference patterns of fao, which suggests the potential use of this unicellular protein like protein source.
Bloqueo auriculoventricular en la angina inestable: Resultados del registro ARIAM
Ruiz-Bailén,M.; Pola Gallego,M.D.; Expósito Ruiz,M.; Pintor Mármol,A.; Issa-Khozouz,Z.; Aguayo de Hoyos,E.; Rucabado-Aguilar,L.; Castillo-Rivera,A.M.; Morante-Valle,A.; Rodríguez-Puche,J.A.; García-Alcántara,A.; Gómez Jiménez,F.J.; ,;
Medicina Intensiva , 2006,
Abstract: objective. describe the frequency of high degree atrioventricular block (hdavb) in patients with unstable angina (ua), analyze the variables associated with their appearance and evaluate whether hdavb is independently associated with increased mortality or increased length of icu stay. design. retrospective descriptive study of patients with ua included in the ariam registry. setting. icus from 129 hospitals in spain. patients. from june 1996 to december 2003 a total of 14,096 patients were included in the ariam registry with a diagnosis of ua. main variables of interest. variables associated with the development of hdavb, variables associated with the mortality of patients with ua, variables associated with the length of icu stay of patients with ua. results. hdavb frequency was 1%. development of hdavb was independently associated with the killip classification and the presence of sustained ventricular tachycardia or ventricular fibrillation. crude mortality of patients was significantly increased when hdavb was present (9% versus 1%, p < 0,001). when adjusted for other variables, hdavb was not associated with increased mortality. development of hdavb in patients with ua was independently associated with an increase in the length of icu stay (adjusted odds ratio 1.89: 95% confidence interval: 1.33-5.69). conclusions. patients with ua complicated with hdavb represent a high-risk population with an increased icu stay.
Treatment of irritable bowel syndrome with probiotics: An etiopathogenic approach at last?
Bixquert Jiménez,M.;
Revista Espa?ola de Enfermedades Digestivas , 2009, DOI: 10.4321/S1130-01082009000800006
Abstract: irritable bowel syndrome (ibs) is the most common functional digestive disorder, and may affect 11-20% of the adult population in industrialized countries. in accordance with rome iii criteria (2006) ibs involves abdominal pain and bowel habit disturbance, which are not explained by structural or biochemical abnormalities. several hypotheses attempt to account for the pathophysiology of ibs, but the etiology still remains uncertain or obscure, perhaps multifactorial. abnormalities in colonic microflora have recently been suggested in such patients, as has abnormal small-intestine bacterial overgrowth (sibo), or in particular a significant reduction in the amount of intraluminal bifidobacteria or lactobacilli, with consequences like the production of colonic gas, and motility or sensitivity disturbances of the intestinal tract. the disorder is difficult to treat, and the wide spectrum of non-drug and drug treatments shows our ignorance about the cause of the condition. newer drugs, both pro- and anti-serotonin, have failed to show long-term efficacy or have been withdrawn due to concerns about harmful effects. recent research has provided increasing support for the idea that disturbances of intestinal microbiota occur in patients with ibs, and that such abnormalities may contribute to ibs symptoms. studies in scandinavian countries in the last ten years emphasize the role of probiotics in the modulation of intestinal microbiota, and as a consequence in the regulation of the motility and hypersensitivity of the digestive tract. although results between studies are difficult to compare because of differences in study design, probiotic dose, strain, and duration of therapy, some studies show symptom improvement. lactobacilli are found among the normal bacterial flora of the gastrointestinal tract, and lactobacillus plantarum (lp) is one of the species frequently isolated from the human mucosa, which is capable of surviving the low ph of the stomach and duodenum, resisti
UNA PROPUESTA PARA LA MAXIMIZACIóN DE LA ESTADíSTICA Q_k
Jiménez M. José
Revista Colombiana de Estadística , 2001,
Abstract: En este artículo mediante el método de los multiplicadores de Lagrange se presenta una forma de maximizar la Estadística Q_k, y de esta manera cuantificar el impacto que ejerce en la suma de cuadrados de los residuales un grupo de observaciones previamente seleccionadas si son corregidas o modificadas.
UNA GENERALIZACIóN DE LA ESTADíSTICA DE COOK UNA GENERALIZACIóN DE LA ESTADíSTICA DE COOK
Jiménez M. José
Revista Colombiana de Estadística , 2001,
Abstract: This paper presents a generalization of the Cook's statistics useful in the identification of influential observations in the least squares estimation of the multiple regression parameters. En este artículo se presenta una generalización de la estadística de Cook la cual permite identificar las observaciones más influyentes en la estimación vía mínimos cuadrados de los parámetros del modelo de regresión lineal múltiple.
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