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Search Results: 1 - 10 of 153131 matches for " Patricia Safa B. "
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De dónde viene el malestar social que hoy nos alarma? Rese a de "Modernización y desencanto. Los efectos de la modernización mexicana en la subjetividad y la gobernabilidad" de Germán Pérez Fernández del Castillo
Jorge E Aceves,Patricia Safa B.
Espiral , 2012,
Abstract:
El estudio de vecindarios y comunidades en las grandes ciudades Una tradición antropológica
Patricia Safa
Espiral , 1995,
Abstract:
The structural, electrical and magnetic properties of La1-xCaxMnO3 Manganite
A. B. Rostamnejadi,M. Safa
Iranian Journal of Physics Research , 2005,
Abstract: Manganites are considered as subbranches of condensed matter physics with a great wealth of physical mechanisms. In this investigation we have studied the structural, electrical and magnetic properties of a series of La1-xCaxMnO3 manganite with x=0.1, 0.2, …,0.5. We observed that the crystal structure of this manganite, with small dopping, at room temperature is orthorhombic and by increasing the amount of dopping, its structure changes towards tetragonal. Also, by increasing calcium dopping a metallic phase induction occurs at low temperature and also a metal-insulator transition occurs at the samples Curie temperature. By increasing the amount of dopping to 0.5 the metalic-insulator transition temperature and the Curie temperature of the samples both increase first and then decrease. We suggest a theoretical model with which we can interpret qualitatively many properties of manganites, such as their metal-insulator phase transition and their colossal magnetoresistance.
Tendencias y retos recientes en tres metrópolis mexicanas: ciudad de México, Guadalajara y Monterrey
Ramírez Sáiz,Juan Manuel; Safa Barraza,Patricia;
Cuadernos de antropolog?-a social , 2009,
Abstract: in this paper we analyze a series of factors or aspects in three large contemporary mexican cities: multi-culturality, inequality, social and urban fragmentation, public insecurity and conflicting conceptions of what the city should be. the article offers an overview of the current situation, on the basis of the authors' own research projects and a review of recent literature on the topic. it is therefore primarily a theoretical paper.
Realidades y retos de las áreas metropolitanas: ciudad de México, Guadalajara y Monterrey
Ramírez Sáiz, Juan Manuel;Safa Barraza, Patricia;
Desacatos , 2011,
Abstract: this article offers an overview of the urban conditions in the country's three leading metropolitan areas at the end of the last century and the beginning of the present one. on the one hand, we consider the changes that have been recorded and the observable trends that structure the internal space of these metropolitan areas. the readjustment they are undergoing is a function of the logic by which these elements operate and the effects it produces on the three cities. thus, attention is paid to the impact that the internal dynamics of each one of them has separately on the metropolitan area. this impact cuts two ways: it deactivates older ways of operating, and proposes new ones. but aside from these sector-based effects, there are problems or trends that affect the cities and their inhabitants simultaneously. in this case, we analyze the main issues that cut across the metropolitan space in its entirety. in both cases, the basic information comes from recent literature.
Tendencias y retos recientes en tres metrópolis mexicanas: ciudad de México, Guadalajara y Monterrey Tendências e desafios recentes em três metrópoles mexicanas: Cidade do México, Guadalajara e Monterrey Recent trends and challenges in three large Mexican cities: Mexico City, Guadalajara and Monterrey
Juan Manuel Ramírez Sáiz,Patricia Safa Barraza
Cuadernos de Antropología Social , 2009,
Abstract: En este trabajo analizamos varios rasgos o facetas en tres ciudades metropolitanas mexicanas contemporáneas: la multiculturalidad, la inequidad, la fragmentación social y urbana, la inseguridad pública y los proyectos enfrentados de ciudad. El artículo constituye un balance sobre la situación prevaleciente elaborado a partir de proyectos de investigación de los autores y de la revisión de la literatura reciente sobre el tema. Es por tanto un trabajo de carácter fundamentalmente teórico. Neste trabalho analizamos vários rasgos ou facetas em três cidades metropolitanas mexicanas contemporaneas: a multiculturalidade, a desigualdade, a fragmenta o social e urbana, a inseguran a pública e os projetos de cidade enfrentados. O artigo faz um balan o sobre a situa o prevalecente e foi elaborado a partir de projetos de pesquisa dos autores e da revis o da literatura recente sobre o tema. é, portanto, um trabalho de caráter fundamentalmente teórico. In this paper we analyze a series of factors or aspects in three large contemporary Mexican cities: multi-culturality, inequality, social and urban fragmentation, public insecurity and conflicting conceptions of what the city should be. The article offers an overview of the current situation, on the basis of the authors' own research projects and a review of recent literature on the topic. It is therefore primarily a theoretical paper.
Deterioro urbano y organización vecinal: el caso de la Asociación Vecinal Jardines del Sol
Juan Manuel Ramírez Sáiz,Patricia Safa Barraza
Espiral , 2011,
Abstract: En este trabajo se analizará el papel de las asociaciones vecinales como intermediarias entre los vecinos y los gobiernos locales. En particular, se revisará la actuación de la asociación vecinal de la colonia "Jardines del Sol", una colonia de clase media ubicada en el municipio de Zapopan de la Zona Metropolitana de Guadalajara, que se consolidó en el 2001, para mejorar y detener el deterioro de la colonia después de 30 a os de su fundación. Se abordarán los siguientes temas: 1) el surgimiento y consolidación de la asociación vecinal Jardines del Sol para detener el deterioro urbano y mejorar la colonia, 2) el confl icto que generó el macro-proyecto La Ciudadela y la respuesta de los vecinos de la colonia y, 3) la relación confl ictiva entre las autoridades municipales y las asociaciones vecinales.
Fragmentos urbanos de una misma ciudad: Guadalajara
Jorge E. Aceves,Renée de la Torre,Patricia Safa
Espiral , 2004,
Abstract: El propósito del artículo es reflexionar sobre las transformaciones recientes en Guadalajara y destacar algunos de los retos que actualmente enfrenta esta ciudad. Proponemos acercarnos a su heterogeneidad; para realizar este recorrido, y como tipificación de espacio habitado, se distinguen cuatro Guadalajaras: la ciudad concéntrica, la ciudad dividida, la ciudad fragmentada y la ciudad flujos. Este viaje nos obliga a elaborar una interpretación crítica de las múltiples representaciones de la identidad de la ciudad, y a delinear algunos nodos problemáticos en el presente que sería necesario resolver para imaginar su futuro
A Fixed Point Theorem for φ-Contraction Mappings in Metric and D-metric Spaces
Safa Salehian
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: In this study we state a type of contraction and then establish a fixed point theorem, then adapted results in D-metric spaces.
Real time control of an active power filter under distorted voltage condition
Ahmed Safa
International Journal of Power Electronics and Drive Systems , 2012, DOI: 10.11591/ijpeds.v2i4.397
Abstract: This paper, presents three phase shunt active filter under distorted voltage condition, the active power filter control is based on the use of self-tuning filter (STF) for reference current generation and on space vector PWM for generation of pulses. The dc capacitor voltage is controlled by a classical PI controller. The diode rectifier feed RL load is taken as a nonlinear load. The self-tuning filter allows extracting directly the voltage and current fundamental components in the axis without phase locked loop (PLL) under distorted voltage condition. The experiment analysis is made based on working under distorted voltage condition, and the total harmonic distortion of source current after compensation .Self tuning filter based extraction technique is good under distorted voltage conditions. The total harmonic distortion (THD) of source current is fully reduced. The effectiveness of the method is theoretically studied and verified by experimentation.
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