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Search Results: 1 - 10 of 462003 matches for " A. Valverde-Portal "
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Relationship between Plant Species Diversity and Plant Biomass of Orchard Grass and Lucerne Sown in Different Ratios in the Province of Salamanca, Spain  [PDF]
M. Medina-Sierra, M. Igual-Arroyo, F. Restrepo-Betancur, A. Valverde-Portal, I. Santa-Regina
Open Journal of Forestry (OJF) , 2017, DOI: 10.4236/ojf.2017.73020
Abstract: A field experiment was carried out at the CSIC Muñovela farm belonging to the Spanish National Research Council (CSIC) in order to evaluate the effect of sowing orchard grass (Dactylis glomerata var. Trerano) and lucerne (Medicago sativa var. Aragon) in monoculture and in combination. The experiment was based on a randomized block designed with a factorial arrangement (5 × 2). Experimental units were 40 plots distributed in four blocks. The phosphorus fertilization (P) factor included two types of conditions: basal fertilization without phosphorus (-P) and basal fertilization with phosphorus (+P), and the vegetation cover factor (T) included five conditions depending on the grass (G) and the legume (L). Above-ground biomass showed statistically significant differences among seasons and years (P < 0.05). However, no statistically significant differences treatments were found among various treatments. The presence of the grass species Lolium perenne L. and Poa pratensis L. throughout the three years indicated that both species significantly increased their presence over time regardless of the treatments applied. The analysis performed for the other plant species (those other than grasses and legumes) allowed us to determine that the T1 and T5 treatments, which correspond to single species not treated with the application of phosphorus, influenced the presence of 70% of other species planted. Our specific aim was to explore how changing plant biotic diversity affects productivity under a given set of conditions. We manipulated plant species richness as an experimental factor to determine if productivity would be affected by changes in the ratios of plants sown.
Extreme Rainfall Indices in the Hydrographic Basins of Brazil  [PDF]
María C. Valverde, José A. Marengo
Open Journal of Modern Hydrology (OJMH) , 2014, DOI: 10.4236/ojmh.2014.41002
Abstract: The authors analyze climate extremes indices (CEI) of rainfall over the largest basins of the Brazilian territory: Amazon (AMA), S?o Francisco (SF), Tocantins (TO) and Paraná (PAR) rivers. The CEI represent the frequency of heavy precipitation events (R30mm and R95p) and short duration extreme rainfall (RX5day and RX1day). Droughts (CDDd) are identified based on two indicators: The longest dry period (CDD) and the annual cycle. The results demonstrate that CDDd, RX1day and RX5day occurred with more frequency and intensity in SF basin during El Ni?o events. CDDd was of greater magnitude in the TO basin during La Ni?a events, while an increase of RX1day occurred in El Ni?o. The strong El Ni?o events (1983 and 1997) caused more intense and frequent RX1day and R30mm over the PAR basin. Amazon droughts occurred in two out of the six El Ni?o events. Moreover, the relationship between the positive (negative) sea superficial temperatures anomalies in North (South) Tropical Atlantic and drought in AMA basin was corroborated. A gradual warming of SST was observed at the start of 2003 until it achieved a maximum in 2005 associated with the southwestern Amazon drought. The second highest anomaly of SST was in 2010 linked with drought that was more spatially extensive than the 2005 drought. The spatial distribution of annual trends showed a significant increase of CDD in south-eastern AMA, Upper SF, northern PAR and throughout the TO basins. R20mm, RX1day and RX5day tend to increase significantly in southwestern (northeast) PAR (AMA) and northwestern TO basins. Comparisons between CEI derived from daily precipitation data from Climate Prediction Center (CPCp) and of the ETA_HadCM3 model showed that the model overestimated RX1day, RX5day and CDD, in the four basins. Future scenarios show that dry periods will occur with greatest magnitude in all the basins until 2071-2099 time slice, while RX1day will be more intense in the TO and SF basins.
Las creencias en el asfalto: La sacralización como una forma de apropiación del espacio público en la ciudad de México
Portal,María Ana;
Cuadernos de antropolog?-a social , 2009,
Abstract: this paper explores how residents of méxico city appropriate public spaces by transforming local places into sacred sites. this sacred quality is achieved by installing crucifixes, altars and niches for virgins and saints. these symbols of folk religion not only adorn public sites, but also offer protection, serve as mnemonic devices and manage spatial liminality -all this in a chaotic city where public spaces are considered to be almost extinct. these elements -faces, proper names, common religious symbols- mark "anonymous" urban spaces, generating meaning and memory for inhabitants. in this fashion, public spaces become a scenario for projecting personal elements of neighborhood groups.
Reflexiones en torno a la ense?anza de la teoría antropológica mexicana en la UAM-I
Portal, María Ana;
Alteridades , 2011,
Abstract: the work presented in this issue is a reflection on my twenty-years experience teaching mexican anthropology in the department of anthropology in the autonomous metropolitan university, iztapalapa unit.
Las creencias en el asfalto: La sacralización como una forma de apropiación del espacio público en la ciudad de México As cren as no asfalto: A sacraliza o como uma forma de apropria o do espa o publico na cidade de México The belives on the asphalt: Sacred sites as means of appropriation of the public space in México City
María Ana Portal
Cuadernos de Antropología Social , 2009,
Abstract: En este trabajo me interesa explorar una de las formas en que los habitantes de la ciudad de México se apropian del espacio público urbano, a partir de la sacralización de lugares específicos en la vía pública. Dicha apropiación se hace visible con la instalación de altares, cruces para sus muertos y nichos para vírgenes y santos. Estos elementos de la religiosidad popular se conforman no sólo en parte del paisaje urbano, sino que tienen una función cotidiana -articulada a la protección, a la construcción de memoria y al manejo de los espacios liminales- en una ciudad aparentemente caótica, en donde los espacios públicos se consideran "en extinción". Son elementos que buscan poblar con rostros y nombres propios el espacio del anonimato urbano, generando lugares de sentido y de memoria para los pobladores locales. De esta manera, el espacio público se constituye en una suerte de escenario en donde lo más personal de los sujetos y los grupos se hace visible. Este trabalho pretende explorar uma das formas en que os moradores da Cidade do Mexico se apropriam do espa o público urbano por meio da sacraliza o de lugares específicos da vía pública. Esta apropria o se torna visível na instala o de altares e crucifixos mortuários. Estes elementos da reliogisidade popular n o só se tornam parte da paisagem urbana, mas tambem adquerem a fun o cotidiana de proteger e construir a memoria e o uso de espa os liminais, numa cidade em apariência caótica na cual os espa os públicos s o considerados "em via de extin o". Estes elementos procuram ocupar com rostos e nomes propios o espa o do anonimato urbano, gerando lugares cheios de sentido e memoria para os povoadores locais. Deste modo, o espa o público vira una especie de senário no cual o aspecto mais pessoal dos sujeitos e dos grupos se torna visível. This paper explores how residents of México City appropriate public spaces by transforming local places into sacred sites. This sacred quality is achieved by installing crucifixes, altars and niches for virgins and saints. These symbols of folk religion not only adorn public sites, but also offer protection, serve as mnemonic devices and manage spatial liminality -all this in a chaotic city where public spaces are considered to be almost extinct. These elements -faces, proper names, common religious symbols- mark "anonymous" urban spaces, generating meaning and memory for inhabitants. In this fashion, public spaces become a scenario for projecting personal elements of neighborhood groups.
La importancia de la discusión metodológica entre Dworkin y el positivismo
García Valverde,Facundo;
Revista latinoamericana de filosof?-a , 2007,
Abstract: in this article i analyse different strategies of defence -derived from hart's postscript- used by the legal positivists against the numerous objections made by ronald dworkin. against the abandonment of the dispute proposed by liam murphy, i show that the methodological and conceptual discussion between dworkin and legal positivism is vital for the dworkinian theoretical purposes.
Software libre, alternativa tecnológica para la educación
Valverde Chavarría, Johnnh
Revista Electrónica Actualidades Investigativas en Educación , 2005,
Abstract: Interesa conocer la utilización práctica del software libre en ámbitos educativos; especialmente se enfatiza en cómo este se puede convertir en una herramienta apropiada para los procesos de ense anza y aprendizaje, aunque sin soslayar sus características ventajosas y menos ventajosas, considerando los contextos en que se ponga en marcha. Además, se dan ejemplos prácticos de su utilización. Se incorporan algunas noticias de eventos y hechos relevantes de reciente suceso para ilustrar más ampliamente lo planteado. It is of interest for the present article the practical use of free software in the field of education; a special emphasis is given to the possibility of its use as an appropriate tool for the processes of education and learning, without avoiding its advantageous and less advantageous features, considering the contexts in which these tools are set forward. Also, practical examples of their use are given. Some news of events and recent relevant facts are included to illustrate the point of discussion in a broader sense.
Globalización y neoliberalismo: un futuro inevitable?
Facundo García Valverde
Revista Latinoamericana de Filosofía , 2007,
Abstract:
La importancia de la discusión metodológica entre Dworkin y el positivismo
Facundo García Valverde
Revista Latinoamericana de Filosofía , 2007,
Abstract: En este artículo analizo las diferentes estrategias del positivismo jurídico -especialmente, las relacionadas con el PostSCript de Herbert Hart- para defenderse de los argumentos que Ronald Dworkin ha venido utilizando desde hace más de treinta a os. En oposición al abandono de la disputa metodológica que propone Liam Murphy, muestro que la discusión conceptual y metodológica es urgente y vital para los propios intereses teóricos dworkinianos. In this article I analyse different strategies of defence -derived from Hart's PostScript- used by the legal positivists against the numerous objections made by Ronald Dworkin. Against the abandonment of the dispute proposed by Liam Murphy, I show that the methodological and conceptual discussion between Dworkin and legal positivism is vital for the dworkinian theoretical purposes.
Brasil: gobernanza regulatoria del sector energético y desarrollo social
Vanesa Valverde Cami?a
Anuario Americanista Europeo , 2012,
Abstract: Resumen: El descubrimiento de nuevos yacimientos petrolíferos y la apuesta por combustibles ecológicos perfilan a Brasil como un líder energético mundial. Sin embargo, este logro no sólo puede sostenerse en la riqueza natural del país, sino que requiere de un modelo basado en políticas energéticas eficientes y sostenibles. El modelo energético brasile o parece mantener tales principios, de un lado con la nueva Ley de Hidrocarburos que garantiza al gobierno el control de estos recursos y de otro con la producción de biocombustibles y etanol. Si bien podemos considerar que la explicación al éxito energético brasile o se centra en gran medida en la disposición de recursos naturales, en este trabajo se argumenta que la gobernanza regulatoria del sector energético desarrollada desde los noventa en Brasil es un factor explicativo directo del mismo, que ha dotado al país de una posición estratégica en América Latina. Finalmente, se tratará de ver cómo el desarrollo energético puede influir en el desarrollo social a través de uno de los países más desiguales de América Latina.
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