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Search Results: 1 - 10 of 122329 matches for " José Reinaldo Martínez-Fernández "
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Influye el uso de estrategias metacognitivas sobre el potencial creativo?
Calixto Gutierrez-Braojos,Ana Martín Romera,José Reinaldo Martínez-Fernández,Purificación Salmerón-Vílchez
Revista de Psicología y Educación , 2012,
Abstract: Desde una aproximación cognitiva al estudio de la creatividad, se ha defendido relaciones significativas entre las estrategias metacognitivas y la creatividad. Sin embargo, los estudios que analizan dichas relaciones son escasos, y el cuerpo de investigaciones empíricas ofrece conclusiones controvertidas. Esta trabajo forma parte un estudio más amplío que comprende el análisis de relaciones entre factores personológicos, cognitivos y la creatividad. En concreto, el presente trabajo tiene por objetivo de estudio testear un modelo teórico sobre las relaciones entre las estrategias metacognitivas y la creatividad mediante modelización con ecuaciones estructurales en estudiantes espa oles universitarios. Los participantes fueron 197 estudiantes matriculados en cuarto curso de la licenciatura de Psicopedagogía. Su participación fue anónima y voluntaria. Dos instrumentos fueron utilizados para la obtención de datos en este estudio: i) La Escala de Estrategias de Aprendizaje (ACRA) de Román y Gallego, (2001) para la medida del constructo estrategias metacognitivas y; ii) El Test de Inteligencia Creativa (CREA) de Corbalán et al., (2003) para la medida del potencial creatividad. Los resultados del estudio muestran una contribución positiva y significativa de las estrategias metacognitivas a la creatividad.
PATRONES DE APRENDIZAJE EN ESTUDIANTES UNIVERSITARIOS DEL MáSTER EN EDUCACIóN SECUNDARIA: VARIABLES PERSONALES Y CONTEXTUALES RELACIONADAS
J. Reinaldo Martínez-Fernández,L. García-Ravidá
PROFESORADO , 2012,
Abstract: En este trabajo analizamos los patrones de aprendizaje (Vermunt, 1998; 2005) en una muestrade estudiantes universitarios del Máster en Formación del Profesorado de Educación Secundaria, y la relación que tienen con ciertas variables personales, contextuales y el rendimiento académico. Participan 101 estudiantes de Formación del Profesorado de una universidad espa ola con una edad media de 27.57, de los cuales 71.30% son mujeres. Los resultados indican que no se reproducen, fielmente, los patrones propuestos por Vermunt, aunque si se aprecia una mayor semejanza conlos resultados que otros trabajos han hallado empleando el ILS con muestras de estudiantes de Educación Secundaria. Igualmente, hallamos relaciones significativas entre el género femenino y mayorespuntuaciones en creencias y orientaciones de aprendizaje y entre la edad con mayores puntuacionesen los indicadores del patrón reproductivo y la orientación a calificaciones y certificados. Además, hallamos que los estudiantes de orientación educativa tienen menor puntuación en elpatrónreproductivo que los estudiantes de ciencias naturales. Estos resultados se discuten en el marco de la formación universitaria del profesorado de Educación Secundaria en una universidad espa ola.
Las decisiones de viajar y la elección modal en desplazamientos interurbanos
María José Caride Estévez,Eduardo L. Giménez-Fernández,Xosé Manuel González Martínez
Urban Public Economics Review , 2005,
Abstract: El objetivo de este trabajo es fundamentar microeconómicamente un modelo de demanda de transporte que proporcione una explicación conjunta a por qué se producen los desplazamientos, cómo se determina el número de viajes y cuáles son los condicionantes de la elección modal. El modelo propuesto considera que el transporte es un bien intermedio que consume recursos monetarios y temporales, incorpora la existencia de valoraciones subjetivas de los atributos de los modos de transporte, y permite explicar la demanda generada tras un cambio en la oferta de transportes. Conocer la demanda de transporte adquiere especial relevancia ya que esta variable es habitualmente utilizada para evaluar económicamente importantes políticas públicas como las de infraestructuras; además, por ser el transporte un bien o consumo intermedio, debería ser el punto de partida para estudiar efectos sobre la movilidad en las ciudades, la congestión, el empleo o la demanda de vivienda.
Temporal Stability of Soil Moisture and Radar Backscatter Observed by the Advanced Synthetic Aperture Radar (ASAR)
Wolfgang Wagner,Carsten Pathe,Marcela Doubkova,Daniel Sabel,Annett Bartsch,Stefan Hasenauer,Günter Bl?schl,Klaus Scipal,José Martínez-Fernández,Alexander L?w
Sensors , 2008, DOI: 10.3390/s8021174
Abstract: The high spatio-temporal variability of soil moisture is the result of atmosphericforcing and redistribution processes related to terrain, soil, and vegetation characteristics.Despite this high variability, many field studies have shown that in the temporal domainsoil moisture measured at specific locations is correlated to the mean soil moisture contentover an area. Since the measurements taken by Synthetic Aperture Radar (SAR)instruments are very sensitive to soil moisture it is hypothesized that the temporally stablesoil moisture patterns are reflected in the radar backscatter measurements. To verify this hypothesis 73 Wide Swath (WS) images have been acquired by the ENVISAT AdvancedSynthetic Aperture Radar (ASAR) over the REMEDHUS soil moisture network located inthe Duero basin, Spain. It is found that a time-invariant linear relationship is well suited forrelating local scale (pixel) and regional scale (50 km) backscatter. The observed linearmodel coefficients can be estimated by considering the scattering properties of the terrainand vegetation and the soil moisture scaling properties. For both linear model coefficients,the relative error between observed and modelled values is less than 5 % and thecoefficient of determination (R2) is 86 %. The results are of relevance for interpreting anddownscaling coarse resolution soil moisture data retrieved from active (METOP ASCAT)and passive (SMOS, AMSR-E) instruments.
La diáspora en la frontera: retos y oportunidades para el estudio del Orlando puertorrique o
Luis Martínez-Fernández
Centro Journal , 2010,
Abstract: This essay reviews and analyses the relatively recent but hugely important phenomenon of the Puerto Rican migration to Central Florida, both from the island and from traditional Puerto Rican enclaves such as New York, Philadelphia and Chicago. It proposes the application of a new paradigm for the study of Puerto Rican Central Florida, a demographic and social reality whose context and timing differ sharply from those of other Puerto Rican communities. The proposed paradigm recognizes Central Florida as a social and political frontier for the nearly 300,000 Puerto Ricans living in the region. This essay also questions the generalized idea of Central Florida as a happy, semitropical paradise by explaining the numerous challenges and forms of discrimination faced by the growing Orlando Rican population.
Design and First Results of an UAV-Borne L-Band Radiometer for Multiple Monitoring Purposes
Rene Acevo-Herrera,Albert Aguasca,Xavier Bosch-Lluis,Adriano Camps,José Martínez-Fernández,Nilda Sánchez-Martín,Carlos Pérez-Gutiérrez
Remote Sensing , 2010, DOI: 10.3390/rs2071662
Abstract: UAV (unmanned Aerial Vehicle) platforms represent a challenging opportunity for the deployment of a number of remote sensors. These vehicles are a cost-effective option in front of manned aerial vehicles (planes and helicopters), are easy to deploy due to the short runways needed, and they allow users to meet the critical requirements of the spatial and temporal resolutions imposed by the instruments. L-band radiometers are an interesting option for obtaining soil moisture maps over local areas with relatively high spatial resolution for precision agriculture, coastal monitoring, estimation of the risk of fires, flood prevention, etc. This paper presents the design of a light-weight, airborne L-band radiometer for deployment in a small UAV, including the hardware and specific software developed for calibration, geo-referencing, and soil moisture retrieval. First results and soil moisture retrievals from different field experiments are presented.
Altered Antioxidant-Oxidant Status in the Aqueous Humor and Peripheral Blood of Patients with Retinitis Pigmentosa
Cristina Martínez-Fernández de la Cámara, David Salom, Ma Dolores Sequedo, David Hervás, Cristina Marín-Lambíes, Elena Aller, Teresa Jaijo, Manuel Díaz-LLopis, José María Millán, Regina Rodrigo
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0074223
Abstract: Retinitis Pigmentosa is a common form of hereditary retinal degeneration constituting the largest Mendelian genetic cause of blindness in the developed world. It has been widely suggested that oxidative stress possibly contributes to its pathogenesis. We measured the levels of total antioxidant capacity, free nitrotyrosine, thiobarbituric acid reactive substances (TBARS) formation, extracellular superoxide dismutase (SOD3) activity, protein, metabolites of the nitric oxide/cyclic GMP pathway, heme oxygenase-I and inducible nitric oxide synthase expression in aqueous humor or/and peripheral blood from fifty-six patients with retinitis pigmentosa and sixty subjects without systemic or ocular oxidative stress-related disease. Multivariate analysis of covariance revealed that retinitis pigmentosa alters ocular antioxidant defence machinery and the redox status in blood. Patients with retinitis pigmentosa present low total antioxidant capacity including reduced SOD3 activity and protein concentration in aqueous humor. Patients also show reduced SOD3 activity, increased TBARS formation and upregulation of the nitric oxide/cyclic GMP pathway in peripheral blood. Together these findings confirmed the hypothesis that patients with retinitis pigmentosa present reduced ocular antioxidant status. Moreover, these patients show changes in some oxidative-nitrosative markers in the peripheral blood. Further studies are needed to clarify the relationship between these peripheral markers and retinitis pigmentosa.
Modelling long-term fire occurrence factors in Spain by accounting for local variations with geographically weighted regression
J. Martínez-Fernández, E. Chuvieco,N. Koutsias
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2013,
Abstract: Humans are responsible for most forest fires in Europe, but anthropogenic factors behind these events are still poorly understood. We tried to identify the driving factors of human-caused fire occurrence in Spain by applying two different statistical approaches. Firstly, assuming stationary processes for the whole country, we created models based on multiple linear regression and binary logistic regression to find factors associated with fire density and fire presence, respectively. Secondly, we used geographically weighted regression (GWR) to better understand and explore the local and regional variations of those factors behind human-caused fire occurrence. The number of human-caused fires occurring within a 25-yr period (1983–2007) was computed for each of the 7638 Spanish mainland municipalities, creating a binary variable (fire/no fire) to develop logistic models, and a continuous variable (fire density) to build standard linear regression models. A total of 383 657 fires were registered in the study dataset. The binary logistic model, which estimates the probability of having/not having a fire, successfully classified 76.4% of the total observations, while the ordinary least squares (OLS) regression model explained 53% of the variation of the fire density patterns (adjusted R2 = 0.53). Both approaches confirmed, in addition to forest and climatic variables, the importance of variables related with agrarian activities, land abandonment, rural population exodus and developmental processes as underlying factors of fire occurrence. For the GWR approach, the explanatory power of the GW linear model for fire density using an adaptive bandwidth increased from 53% to 67%, while for the GW logistic model the correctly classified observations improved only slightly, from 76.4% to 78.4%, but significantly according to the corrected Akaike Information Criterion (AICc), from 3451.19 to 3321.19. The results from GWR indicated a significant spatial variation in the local parameter estimates for all the variables and an important reduction of the autocorrelation in the residuals of the GW linear model. Despite the fitting improvement of local models, GW regression, more than an alternative to "global" or traditional regression modelling, seems to be a valuable complement to explore the non-stationary relationships between the response variable and the explanatory variables. The synergy of global and local modelling provides insights into fire management and policy and helps further our understanding of the fire problem over large areas while at the same time recognizing its local character.
Standard criteria versus Rosemont classification for EUS-diagnosis of chronic pancreatitis
Jimeno-Ayllón,Cristina; Pérez-García,José Ignacio; Gómez-Ruiz,Carmen Julia; García-Cano-Lizcano,Jesús; Morillas-Ari?o,Julia; Martínez-Fernández,Raquel; Serrano-Sánchez,Lorena; Pérez-Sola,ángel;
Revista Espa?ola de Enfermedades Digestivas , 2011, DOI: 10.4321/S1130-01082011001200004
Abstract: aim: to study the possible differences in the final diagnosis of chronic pancreatitis by using standard classification described by wiersema et al. and the new classification proposed recently by rosemont. material and methods: forty-seven patients with the diagnosis of chronic pancreatitis were included in this study. the parenchymal and ductal criteria were studied, the patients were divided in two groups for wiersema criteria: < 4 criteria, non-diagnostic for chronic pancreatitis and ≥ 4 criteria, diagnosis of chronic pancreatitis. the same patients were divided in four groups according to rosemont classification: normal pancreas, indeterminate, suggestive and consistent with chronic pancreatitis. we analyzed these data with chi-square test reported with 95% confidence intervals (ci). results: in patients with chronic pancreatitis the most frequent criteria observed were lobularity in 66% of cases and pancreatic duct dilatation and calcifications in 57.4% of cases each. we found a significant statistical association between the results of both classifications (p < 0.05). the highest association is found in patients with more than 4 standard criteria and definitive diagnostic of chronic pancreatitis according to rosemont classification. in patients who have less than 4 standard criteria the diagnosis is suggestive of chronic pancreatitis by using the rosemont classification in 27.66% (p < 0.05). conclusion: these results show that no significant statistical differences are found for patients with > 4 criteria diagnosis by standard criteria. but 27.66% patients with less than 4 standard criteria would be suggestive according to rosemont classification (p < 0.05). hence, the new classification would be useful in patients with high suspicion of chronic pancreatitis with < 4 standard criteria but with more significance such as parenchymal lithiasis, lobularity or ductal calcifications.
Insights into the role of differential gene expression on the ecological adaptation of the snail Littorina saxatilis
Mónica Martínez-Fernández, Louis Bernatchez, Emilio Rolán-Alvarez, Humberto Quesada
BMC Evolutionary Biology , 2010, DOI: 10.1186/1471-2148-10-356
Abstract: Among the 99 transcripts shared between ecotypes, 12.12% showed significant differential expression. At least 4% of these transcripts still displayed significant differences after correction for multiple tests, highlighting that gene expression can differ considerably between subpopulations adapted to alternative habitats in the face of gene flow. One of the transcripts identified was Cytochrome c Oxidase subunit I (COI). In addition, 6 possible reference genes were validated to normalize and confirm this result using qPCR. α-Tubulin and histone H3.3 showed the more stable expression levels, being therefore chosen as the best option for normalization. The qPCR analysis confirmed a higher COI expression in SU individuals.At least 4% of the transcriptome studied is being differentially expressed between ecotypes living in alternative habitats, even when gene flow is still substantial between ecotypes. We could identify a candidate transcript of such ecotype differentiation: Cytochrome c Oxidase Subunit I (COI), a mitochondrial gene involved in energy metabolism. Quantitative PCR was used to confirm the differences found in COI and its over-expression in the SU ecotype. Interestingly, COI is involved in the oxidative phosphorylation, suggesting an enhanced mitochondrial gene expression (or increased number of mitochondria) to improve energy supply in the ecotype subjected to the strongest wave action.Unravelling processes that underlie population divergence is a crucial step towards elucidating the origin and maintenance of biodiversity [1], and towards understanding the genetic basis of speciation, which is one of the most fundamental goals in evolutionary genetics [2]. However, there is still much to be learned about how divergent populations adapt to different environments under the effect of natural selection, which ultimately may evolve into biological species [3]. The new "omics" technologies, despite being very young, can contribute to this since they have taken
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