oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 2 )

2019 ( 690 )

2018 ( 890 )

2017 ( 823 )

Custom range...

Search Results: 1 - 10 of 513280 matches for " José A. Plaza-úbeda "
All listed articles are free for downloading (OA Articles)
Page 1 /513280
Display every page Item
Adaptability, Entrepreneurship and Stakeholder Integration: Scenarios and Strategies for Environment and Vulnerability  [PDF]
Jerónimo De-Burgos-Jiménez, Diego A. Vazquez-Brust, José A. Plazabeda
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.210160
Abstract: The “vicious circle” between poverty and environmental deterioration is a major challenge for those developmental approaches which look to improve the welfare of vulnerable communities. Environmental deterioration increases poverty while, at the same time, poverty causes further environmental deterioration as the business activities which communities depend upon for survival aggravate environmental deterioration by causing pollution and waste. It is therefore necessary that firms and communities collaborate in order to develop innovative solutions to break this vicious circle. This paper argues that such collaboration should be based on genuine stakeholders’ integration and entrepreneurship, proposes a holistic framework to guide business intervention strategies, and further explores collaboration scenarios between firms and communities.
Grupos de interés, gestión ambiental y resultado empresarial: una propuesta integradora
José Antonio Plaza úbeda,Jerónimo de Burgos Jiménez,Luis Jesús Belmonte Ure?a
Cuadernos de Economía y Dirección de la Empresa , 2011,
Abstract:
Evidence for 5S rDNA Horizontal Transfer in the toadfish Halobatrachus didactylus (Schneider, 1801) based on the analysis of three multigene families
Merlo Manuel A,Cross Ismael,Palazón José L,úbeda-Manzanaro María
BMC Evolutionary Biology , 2012, DOI: 10.1186/1471-2148-12-201
Abstract: Background The Batrachoididae family is a group of marine teleosts that includes several species with more complicated physiological characteristics, such as their excretory, reproductive, cardiovascular and respiratory systems. Previous studies of the 5S rDNA gene family carried out in four species from the Western Atlantic showed two types of this gene in two species but only one in the other two, under processes of concerted evolution and birth-and-death evolution with purifying selection. Here we present results of the 5S rDNA and another two gene families in Halobatrachus didactylus, an Eastern Atlantic species, and draw evolutionary inferences regarding the gene families. In addition we have also mapped the genes on the chromosomes by two-colour fluorescence in situ hybridization (FISH). Results Two types of 5S rDNA were observed, named type α and type β. Molecular analysis of the 5S rDNA indicates that H. didactylus does not share the non-transcribed spacer (NTS) sequences with four other species of the family; therefore, it must have evolved in isolation. Amplification with the type β specific primers amplified a specific band in 9 specimens of H. didactylus and two of Sparus aurata. Both types showed regulatory regions and a secondary structure which mark them as functional genes. However, the U2 snRNA gene and the ITS-1 sequence showed one electrophoretic band and with one type of sequence. The U2 snRNA sequence was the most variable of the three multigene families studied. Results from two-colour FISH showed no co-localization of the gene coding from three multigene families and provided the first map of the chromosomes of the species. Conclusions A highly significant finding was observed in the analysis of the 5S rDNA, since two such distant species as H. didactylus and Sparus aurata share a 5S rDNA type. This 5S rDNA type has been detected in other species belonging to the Batrachoidiformes and Perciformes orders, but not in the Pleuronectiformes and Clupeiformes orders. Two hypotheses have been outlined: one is the possible vertical permanence of the shared type in some fish lineages, and the other is the possibility of a horizontal transference event between ancient species of the Perciformes and Batrachoidiformes orders. This finding opens a new perspective in fish evolution and in the knowledge of the dynamism of the 5S rDNA. Cytogenetic analysis allowed some evolutionary trends to be roughed out, such as the progressive change in the U2 snDNA and the organization of (GATA)n repeats, from dispersed to localized in one locus. Th
EL HABEAS CORPUS EN LA CONSTITUCIóN ESPA OLA DE 1812
Elisa García úbeda
Revista de estudios histórico-jurídicos , 1998,
Abstract:
Eupsophus calcaratus (Anura, Leptodactilydae): ampliación de su distribución geográfica y hábitats en Argentina
úbeda, Carmen A.
Cuadernos de Herpetología , 2000,
Abstract: Argentina, Provincia de Chubut, Departamento de Futaleufú: 1) Parque Nacional Los Alerces, margen NE del Lago Menéndez, proximidad desembocadura Arroyo Zanjón Hondo, (42°42' S, 71°41' O), 520 m snm, 14/febrero/1997. Un ejemplar macho adulto, colector: Carmen A. MACN 37034. 2) Parque Nacional Los Alerces, Arroyo Torrecillas, Lago Menéndez, 18/enero/1972. Colector: Monaglio. MACN 29946. 3) Parque Nacional Los Alerces, Lago Futalaufquen, 25/abril/1969. Colector: Foerster. CENAI 7163. 4) Parque Nacional Los Alerces, margen norte del Lago 1 [actualmente parte del Lago Amutui Quimei], (43°01' S, 71°46' O), 1-2/1971. Colectores: Monadio, Garrido y Bianchini. MACN 29723/28.
Efecto del riego y la cobertura del suelo sobre la productividad de dos cultivares de ají dulce Effect of irrigation and plastic mulch over productivity of two sweet pepper cultivars
José A Gil-Marín,Nelson J Monta?o-Mata,Ramiro Plaza
Bioagro , 2012,
Abstract: Se realizó un experimento en el sistema de riego sector Perú-San Vicente, municipio Maturín, estado Monagas, con el objetivo de determinar la lámina de riego más apropiada para dos cultivares de ají dulce (Capsicum chinense Jacq.) bajo cobertura de suelo. Mediante riego por goteo (un emisor por planta con descarga de 1,2 L·h-1) se evaluaron cuatro láminas de riego para los cultivares Perú 92 y Diamond, calculadas en base a un 60, 70, 80 y 100 % de la evapotranspiración del cultivo (ETc), combinadas o no con la técnica de acolchado del suelo. La ETc se determinó en función del coeficiente del cultivo y de la evapotranspiración de referencia (ET0), y esta última se estimó como el 75 % de la evaporación medida en una tina tipo “A”. Se usó un dise o de parcelas sub-divididas en bloques al azar con tres repeticiones, donde la parcela principal estuvo representada por los dos cultivares, la sub-parcela por la condición de cobertura del suelo y la sub-sub-parcela por la lámina de riego. La separación entre plantas fue de 0,33 m y 1,0 m entre hileras. Se determinó el rendimiento así como el peso y número de frutos por planta. El mayor rendimiento de frutos lo produjo el cultivar Perú 92 con la estrategia de riego del 80 % ETc y el uso del acolchado plástico, lo cual sugiere que bajo esas condiciones se podría incrementar hasta en un 60 % los rendimientos del cultivo de ají. The experiment was performed in the irrigation system of sector Peru-San Vicente, Maturin municipality, Monagas State, to determine the most appropriate irrigation depth in two cultivars of sweet pepper (Capsicum chinense Jacq.) under soil coverage. Drip irrigation (a drip per plant with a flow rate of 1.2 L·h-1) was used to evaluate four irrigation levels for the cultivars Peru 92 and Diamond, with or without the use of soil plastic mulch. The irrigation levels were 60%, 70%, 80% and 100 % of the crop evapotranspiration (ETc) calculated as a function of the crop coefficients and reference evapotranspiration (ET0). The ET0 was estimated as 75 % of the type A evaporation pan. A split-split plot design was used in randomized blocks with three replications, where the main plot was represented by the cultivars, the sub-plot for the soil coverage (plastic mulch or bare soil) and the sub-subplot for the irrigation level. Plants were spaced 0.33 x 1.00 m. The weight of fruit, fruit number per plant and yield was tested. The highest fruit yield was produced by the cultivar Peru 92 with the irrigation 80 % ETc with the use of plastic mulch, which suggests that the yield of sweet pepper could increase
Recognition of Standard Platform RoboCup Goals
José María Ca?as Plaza,Eduardo Perdices,Tomás González,Domenec Puig
Journal of Physical Agents , 2010,
Abstract: RoboCup provides a common research framework where a wide range of problems closely related to robotics and artificial intelligence must be addressed. The main focus of the RoboCup activities is competitive soccer. Thus, the visual identification of players and play-field components is a necessary task to be performed. In particular, goals are some of the key elements that should be identified by each player (robot). In this way, this paper introduces a fast and robust methodology based on Artificial Vision techniques for the recognition of the goals utilized in the RoboCup Standard Platform League. First, 2D images captured by the front camera mounted in the head of a Nao robot are used to recognize the goals through a color based geometrical segmentation method. Afterwards, the position of the robot with respect to the goal is calculated exploiting 3D geometric properties. The proposed system is validated with real images corresponding to the RoboCup2009 competition.
Potential Effects of Climate Change on the Water Level, Flora and Macro-fauna of a Large Neotropical Wetland
Bárbara úbeda, Adrian S. Di Giacomo, Juan José Neiff, Steven A. Loiselle, Alicia S. Guadalupe Poi, José ángel Gálvez, Silvina Casco, Andrés Cózar
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0067787
Abstract: Possible consequences of climate change in one of the world’s largest wetlands (Ibera, Argentina) were analysed using a multi-scale approach. Climate projections coupled to hydrological models were used to analyse variability in wetland water level throughout the current century. Two potential scenarios of greenhouse gas emissions were explored, both resulting in an increase in the inter-annual fluctuations of the water level. In the scenario with higher emissions, projections also showed a long-term negative trend in water-level. To explore the possible response of biota to such water-level changes, species-area relationships of flora and aerial censuses of macro-fauna were analysed during an extraordinary dry period. Plant species richness at the basin scale was found to be highly resistant to hydrological changes, as the large dimension of the wetland acts to buffer against the water-level variations. However, local diversity decreased significantly with low water levels, leading to the loss of ecosystem resilience to additional stressors. The analysis of macro-fauna populations suggested that wetland provides refuge, in low water periods, for the animals with high dispersal ability (aquatic and migratory birds). On the contrary, the abundance of animals with low dispersal ability (mainly herbivorous species) was negatively impacted in low water periods, probably because they are required to search for alternative resources beyond the wetland borders. This period of resource scarcity was also related to increased mortality of large mammals (e.g. marsh deer) around water bodies with high anthropogenic enrichment and cyanobacteria dominance. The synergy between recurrent climatic fluctuations and additional stressors (i.e. biological invasions, eutrophication) presents an important challenge to the conservation of neotropical wetlands in the coming decades.
Comparison Between Fractional Vegetation Cover Retrievals from Vegetation Indices and Spectral Mixture Analysis: Case Study of PROBA/CHRIS Data Over an Agricultural Area
Juan C. Jiménez-Mu?oz,José A. Sobrino,Antonio Plaza,Luis Guanter,José Moreno,Pablo Martinez
Sensors , 2009, DOI: 10.3390/s90200768
Abstract: In this paper we compare two different methodologies for Fractional Vegetation Cover (FVC) retrieval from Compact High Resolution Imaging Spectrometer (CHRIS) data onboard the European Space Agency (ESA) Project for On-Board Autonomy (PROBA) platform. The first methodology is based on empirical approaches using Vegetation Indices (VIs), in particular the Normalized Difference Vegetation Index (NDVI) and the Variable Atmospherically Resistant Index (VARI). The second methodology is based on the Spectral Mixture Analysis (SMA) technique, in which a Linear Spectral Unmixing model has been considered in order to retrieve the abundance of the different constituent materials within pixel elements, called Endmembers (EMs). These EMs were extracted from the image using three different methods: i) manual extraction using a land cover map, ii) Pixel Purity Index (PPI) and iii) Automated Morphological Endmember Extraction (AMEE). The different methodologies for FVC retrieval were applied to one PROBA/CHRIS image acquired over an agricultural area in Spain, and they were calibrated and tested against in situ measurements of FVC estimated with hemispherical photographs. The results obtained from VIs show that VARI correlates better with FVC than NDVI does, with standard errors of estimation of less than 8% in the case of VARI and less than 13% in the case of NDVI when calibrated using the in situ measurements. The results obtained from the SMA-LSU technique show Root Mean Square Errors (RMSE) below 12% when EMs are extracted from the AMEE method and around 9% when extracted from the PPI method. A RMSE value below 9% was obtained for manual extraction of EMs using a land cover use map.
E-learning para la Formación Profesional Inicial en Andalucía: cuatro a os de experiencia
María José Vázquez Morillo,Carlos Marcelo García,Carmen Lázaro Plaza,Francisco J. álvarez Arcos
RED : Revista de Educación a Distancia , 2007,
Abstract: E-learning está poco a poco convirtiéndose en la respuesta más adecuada a las necesidades de formación profesional de personas en diferentes momentos de su vida. Acercar la formación a las personas que por diferentes razones (porque son trabajadores en activo, cuidadores, minusválidos, personas que viven en entornos alejados de centros educativos, etc.) no pueden asistir a las ofertas formativas presenciales, constituye una necesidad en nuestra sociedad actual. Desde el curso académico 2003-2004, la Consejería de Educación de la Junta de Andalucía viene ofertando la posibilidad de realizar Ciclos Formativos de Grado Medio y Superior a través de la modalidad e-learning. Desde ese curso poco a poco se ha ido ampliando la oferta formativa con nuevos módulos y ciclos. Podemos decir que la experiencia que ahora describimos, que cuenta ya con cuatro a os de andadura, vino a representar un proyecto pionero en Espa a, ya que en el momento de su inicio no existían ofertas formativas similares. Desde el nacimiento del proyecto, son seis las Comunidades Autónomas las que han iniciado acciones similares, lo que poco a poco va creando un espacio de colaboración y desarrollo entre diferentes comunidades autónomas.
Page 1 /513280
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.