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Search Results: 1 - 10 of 178139 matches for " Marcela H. González "
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Statistical Prediction of Wet and Dry Periods in theComahue Region (Argentina)  [PDF]
Marcela H. González, Diana Dominguez
Atmospheric and Climate Sciences (ACS) , 2012, DOI: 10.4236/acs.2012.21004
Abstract: General features of rainy season with excess or deficits are analyzed using standardized precipitation index (SPI) in Limay and Neuquen River basins. Results indicate that most of dry and wet periods persist less than three months in both basins. Furthermore, an increase of rainfall variability over time is observed in the Limay river basin but it is not detected in the Neuquen river basin. There is a tendency for wet (dry) periods to take place in El Ni?o (La Ni?a) years in both basins. Rainfall in both basins, have an important annual cycle with its maximum in winter. In addition, possible causes of extreme rainy seasons over the Limay River Basin are detailed. The main result is that the behavior of low level precipitation systems displacing over the Pacific Ocean in April influences the general hydric situation during the whole rainy season. In order to establish the existence of previous circulation patterns associated with interannual SPI variability, the composite fields of wet and dry years are compared. The result is that rainfall is related to El Ni?o- Southern Oscillation (ENSO) phenomenon and circulation over the Pacific Ocean. The prediction scheme, using multiple linear regressions, showed that 46% of the SPI variance can be explained by this model. The scheme was validated by using a cross-validation method, and significant correlations are detected between observed and forecast SPI. A polynomial model is used and it little improved the linear one, explaining the 49% of the SPI variance. The analysis shows that circulation indicators are useful to predict winter rainfall behavior.
Un esquema de estimación de la precipitación estival en la ciudad de Buenos Aires
Cariaga,María L.; González,Marcela H.;
Meteorologica , 2010,
Abstract: the aim of this study is to estimate december to february rainfall in buenos aires city and its surroundings, using atmospheric variables. summer rainfall in buenos aires was correlated with sea surface temperature, 1000 hpa, 500 hpa and 200 hpa geopotential heights, sea surface pressure, 850 hpa zonal and meridional and specific humidity from the ground to 700 hpa, observed in the previous month. some predictors were selected based on the statistical significance, the independence and the physical meaning and they were used as entrance variables to generate a multiple linear regression using the"forward stepwise" method. the selected predictors were: 1000 hpa geopotential height in the atlantic ocean coast, near 25os and zonal wind in central south america near 15os. therefore the final model showed that summer rainfall is mainly influenced by the weakening of the atlantic anticyclone and the moist air advection from the north. the verification was done for 1984-2007 period and the correlation between the observed and estimated rainfall was 0.61. the stability of the model was proved using a crossvalidation methodology. the results were encouraging and indicate the existence of certain rainfall predictability in summer for buenos aires area.
Un esquema de estimación de la precipitación estival en la ciudad de Buenos Aires An estimate scheme of the summer precipitation in the city of Buenos Aires
María L. Cariaga,Marcela H. González
Meteorologica , 2010,
Abstract: El objetivo del trabajo es estimar la precipitación estival en la ciudad y Gran Buenos Aires. Para ello fue correlacionada con los campos de temperatura de la superficie del mar, las alturas geopotenciales en 1000 hPa, 500 hPa y 200 hPa, la presión a nivel del mar, viento en 850 hPa y humedad específica en niveles bajos en el mes previo. Predictores fueron seleccionados basándose en la significancia estadística, la independencia y la explicación física de su relación y utilizados como variables de entrada para generar una regresión lineal múltiple con el método "forward stepwise". Ellos son la altura geopotencial de 1000 hPa sobre la costa del océano Atlántico alrededor de 25oS y el viento zonal en el centro de América del Sur. La lluvia estival depende principalmente del debilitamiento del anticiclón del Atlántico y de la advección de aire húmedo desde el norte del país. La verificación se realizó para los datos del período 1984-2007 obteniendo una correlación entre la serie observada y estimada de 0.61. La estabilidad del modelo se probó con la metodología de la crossvalidación. Los resultados indican la existencia de predictabilidad para la precipitación estival para el área de Buenos Aires. The aim of this study is to estimate December to February rainfall in Buenos Aires city and its surroundings, using atmospheric variables. Summer rainfall in Buenos Aires was correlated with sea surface temperature, 1000 hPa, 500 hPa and 200 hPa geopotential heights, sea surface pressure, 850 hPa zonal and meridional and specific humidity from the ground to 700 hPa, observed in the previous month. Some predictors were selected based on the statistical significance, the independence and the physical meaning and they were used as entrance variables to generate a multiple linear regression using the"forward stepwise" method. The selected predictors were: 1000 hPa geopotential height in the Atlantic Ocean coast, near 25oS and zonal wind in central South America near 15oS. Therefore the final model showed that summer rainfall is mainly influenced by the weakening of the Atlantic Anticyclone and the moist air advection from the north. The verification was done for 1984-2007 period and the correlation between the observed and estimated rainfall was 0.61. The stability of the model was proved using a crossvalidation methodology. The results were encouraging and indicate the existence of certain rainfall predictability in Summer for Buenos Aires area.
The ringtail tonguefish, Symphurus ocellaris, a new addition to the marine fish fauna of Mexico (Cynoglossidae, Pleuronectiformes)
van der Heiden, Albert M.;Ruiz-Guerrero, Marcela;Plascencia-González, Héctor G.;
Revista mexicana de biodiversidad , 2011,
Abstract: eleven specimens of the ringtail tonguefish, symphurus ocellaris munroe and robertson, 2005, were obtained from off the coasts of chiapas and colima, mexico. previously, this species was known only from the 2 type specimens collected off the pacific coast of panama. our finding constitutes the first record of the species in mexico and the second known occurrence of the species. the northern distribution limit of s. ocellaris is now extended by 11.5 degrees latitude or about 3 400 km of the eastern pacific coastline, from panama to colima, mexico.
Detección de Salmonella enteritidis en muestras de productos avícolas de consumo humano en la Región Metropolitana Detection of Salmonella enteritidis in samples of poultry products for human consumption in the Chilean Metropolitan Area
Marcela Alexandre S,Claudia Pozo M,Viviana González G,María Cristina Martínez H
Revista médica de Chile , 2000,
Abstract: Background: Salmonella enteritidis (SE) is a frequent cause of diarrhea, and is transmitted mainly by SE contaminated eggs or poultry meat. The frequency of SE contaminated eggs or chicken meat and the risk for acquiring this pathogen is unknown in Chile. Aim: To measure SE contamination in eggs poultry meat and entrails offered in retail markets in the Metropolitan Area during two consecutive years (1998-1999). Material and methods: Samples were placed in sterile bags and transported to the laboratory before 4 hours at 4°C. Microbiologic detection was done using a standard procedure and an immunodetection assay. Results: SE was found in one of 1081 egg samples (0.09%). The contaminated sample was offered in a supermarket under their own commercial name. Six percent of 1154 poultry meat samples were contaminated by SE and 2.3% by other Salmonella serotypes. Entrails had even higher rates with 10.2% of 370 samples harboring SE and 2,7% other serotypes. Total Salmonella sp. isolates and SE isolates declined during 1999. Nine SE phagotypes were identified, predominating types 4 and 7. Conclusions: Eggs and other avian products are contaminated by different SE phagotypes and other Salmonella serotypes, implicating a risk for the consumers (Rev Méd Chile 2000; 128: 1075-83).
The ringtail tonguefish, Symphurus ocellaris, a new addition to the marine fish fauna of Mexico (Cynoglossidae, Pleuronectiformes) La lengua cola ocelada, Symphurus ocellaris, una nueva adición a la ictiofauna de México (Cynoglossidae, Pleuronectiformes)
Albert M. van der Heiden,Marcela Ruiz-Guerrero,Héctor G. Plascencia-González
Revista mexicana de biodiversidad , 2011,
Abstract: Eleven specimens of the ringtail tonguefish, Symphurus ocellaris Munroe and Robertson, 2005, were obtained from off the coasts of Chiapas and Colima, Mexico. Previously, this species was known only from the 2 type specimens collected off the Pacific coast of Panama. Our finding constitutes the first record of the species in Mexico and the second known occurrence of the species. The northern distribution limit of S. ocellaris is now extended by 11.5 degrees latitude or about 3 400 km of the eastern Pacific coastline, from Panama to Colima, Mexico. Se recolectaron 11 individuos de la especie lengua cola ocelada, Symphurus ocellaris Munroe y Robertson, 2005, frente a las costas de Chiapas y Colima, México. Hasta el momento, la especie sólo era conocida a partir de 2 ejemplares tipo recolectados frente a la costa pacífica de Panamá. El presente descubrimiento constituye el primer registro para México y un segundo reporte conocido de la especie. Se extiende el ámbito de distribución norte a de la especie en 11.5 grados de latitud (aproximadamente 3 400 km de línea de costa del Pacífico oriental), desde Panamá hasta Colima, México.
Análisis de citación y de redes sociales para el estudio del uso de revistas en centros de investigación: an approach to the development of collections
González, Claudia Marcela;
Ciência da Informa??o , 2009, DOI: 10.1590/S0100-19652009000200004
Abstract: the objective of this article is to present a methodological approach to the study of use of journals by researchers. in addition to the technique of analysis of citation and analysis of social nets, bibliometrical maps are elaborated which proportionate capacity of synthesis of complex information. their utilization in evaluating collections would bring in valuable information for the equitatifve distribution of the economic resources alloted to the purchase of tittles and optimization of their availability and access.
Pobreza, violencia y derechos humanos
Marcela González Rivas
Papeles de población , 1995,
Abstract:
LA AGENCIA DE LA NI A Y EL NI O EN LA CONDICIóN PRE-CIUDADANA AGENCY (CHILDHOOD IN THE PRE-CITIZEN CONDITION)
González Coto, Marcela
Revista Electrónica Actualidades Investigativas en Educación , 2012,
Abstract: Resumen: El presente ensayo se deriva del trabajo que recientemente han desarrollado la Fundación PANIAMOR y la Dirección General del Programa CEN-CINAI del Ministerio de Salud, sobre la formación ciudadana de los ni os y las ni as costarricenses en la primera infancia. Las acciones conjuntas se han enfocado en la capacidad de agencia de los ni os y las ni as, entendida como la disposición para explorar, reflexionar, actuar y valorarse en sus entornos como sujetos políticos. Para este fin, en este ensayo se lleva a cabo un análisis crítico de los modelos ideológicos y culturales que, en la sociedad contemporánea, legitiman y fomentan la condición de “pre-ciudadanía” de la infancia, mermando su desempe o, presente y futuro, como ciudadanos plenos de la sociedad. El análisis se sustenta en materiales diversos, de distintos orígenes, todos relativos a las condiciones actuales de la infancia y las formas como se restringen estas capacidades de agencia. El ensayo también aborda las dificultades y obstáculos que enfrenta un replanteamiento de las relaciones entre adultos y ni os. También se documentan los esfuerzos recientes, tanto locales como internacionales, para crear marcos alternativos desde los cuales replantear la relación institucional entre unos y otros. Como principal resultado del ensayo, se delinean un conjunto de directrices, con expresión curricular, que pueden sustentar el desarrollo de las capacidades de agencia infantil con una manifestación directa en la ni ez ciudadana, la cual, se plantea, se articula en tres dimensiones o ejes de desarrollo (la responsabilidad, la autonomía y el pensamiento complejo).Abstract: This essay is derived from the works that have recently developed the PANIAMOR Foundation and the General Board of Directors of the CEN-CINAI Program of the National Ministry of Health, on the civic education of Costa Rican children in early childhood. Joint activities have focused on the ability of agency to children in this age, understood as a willingness to explore, reflect, act and valued in their environments as political subjects. For this goal, this paper conducts a critical analysis of the ideological and cultural models, in the contemporary society, that legitimize and promote the status of "pre-citizens" of the children, diminishing their performance, present and future, as full citizens of their society. The analysis is based on different materials from distinct origins, all relating to the current conditions of childhood and the ways in which these capabilities are diminished. The essay also discusses the difficulties
Efecto del acibenzolar-s-metil sobre el desarrollo de la virosis causada por potyvirus en tomate de árbol
Mejía A.,Diana Marcela; Rodas G.,Erika Isabel; Pati?o H.,Luis Fernándo; González J.,Elena Paola;
Agronomía Colombiana , 2009,
Abstract: tree tomato virosis has become a major constraint on the production and quality of this fruit in colombia. the effect of resistance inductor acibenzolar-s-methyl- asm (boost?) on virus incidence and severity was tested by applying a 0.08% solution of this commercial product on healthy plants also inoculated with an extract of infected ones. asm applications were carried out every 20 days. the plants treated with the product prior to inoculation showed a 7 day delay in manifesting infection symptoms, and a considerable reduction in disease severity. out of this same group of treatments, the one in which asm was applied twice after inoculation, determined viral incidence to be reduced by 50%, when compared to non-resistance-induced plants (100%). the same incidence pattern was found through the area under the disease progress curve (audpc) procedure. although the potyvirus was detected through a das - elisa test, it showed no significant concentration differences among the treatments.
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