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Search Results: 1 - 10 of 3289 matches for " Quetzalli AGUILAR-VIRGEN "
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Potential production of electricity from biogas generated in a sanitary landfill Potencial de producción eléctrica del biogás generado en un relleno sanitario
Aguilar-Virgen Quetzalli,Taboada-González Paul,Ojeda-Benítez Sara
Ingeniería e Investigación , 2011,
Abstract: Energy forms the cornerstone of almost every economic, social and cultural sector in modern societies. Energy is regarded as an irreplaceable ingredient in such societies’ industrial development. The aim of this research was to estimate the generation of biogas in the city of Ensenada’s sanitary landfill to ascertain the amount of energy which could be generated from the solid waste being disposed of. Biogas estimates were conducted in two stages: a waste characterisation study followed by implementing the regulations proposed by SCS Engineers (SCS Engineers, 2009) regarding the Mexican biogas model (version 2.0). The results showed that a large quantity of organic matter (around 70%) is a key element in anaerobic degradation of waste. As to energy generation, it is believed that a full 1.90 MW capacity will be reached in 2019. Such energy could increase Ensenada’s current electricity generation capacity by 3.46% and provide 60% of the energy needed for street lighting, thereby leading to USD $1.423 million in savings. El papel de la energía en la vida de las sociedades modernas ocupa un lugar central en casi todos los sectores económicos, sociales y culturales. La energía se considera como un ingrediente irreemplazable para las sociedades económicas y el progreso industrial. El objetivo de esta investigación fue estimar la generación de biogás del relleno sanitario de Ensenada (estado mexicano de Baja California) con la finalidad de conocer la cantidad de energía que se podría generar con los residuos sólidos depositados en él. La estimación de biogás se llevó a cabo en dos etapas: 1) se realizó un estudio de caracterización de residuos; 2) se siguieron los lineamientos propuestos por SCS Engineers (2009) del Modelo Mexicano de Biogás versión 2.0. Los resultados muestran una gran cantidad de materia orgánica (aproximadamente el 70%), lo cual es un aspecto clave en el proceso anaeróbico de los residuos. En cuanto a la generación de energía, se tiene que se llegará a una capacidad máxima de 1,90 MW en el 2019. Dicha energía podría aumentar la capacidad de generación eléctrica existente en Ensenada aproximadamente en un 3,46% y abastecer el 60% de la energía necesaria para alumbrado público, con un ahorro de 1.423 millones de dólares.
Potencial de recuperación de residuos sólidos domésticos dispuestos en un relleno sanitario
Aguilar-Virgen,Quetzalli; Armijo-de Vega,Carolina; Taboada-González,Paul; Aguilar,Xochitl M.;
Revista de Ingeniería , 2010,
Abstract: knowing the amount and type of domestic solid waste (dsw) that is deposited in the land fill gives us the possibility to consider options in how to make sustainable use of it. waste from any location, if properly handled, can be turned into the raw material for other processes. the aim of this study was to quantify the components of the dsw likely to be recycled, deposited in the landfill in the city of ensenada, baja california, mexico, so that they could be valued on the market as recyclables. the average weekly market could be 643.67 tons of food waste for composting, 389.45 tons of paper and cardboard, 217.55 tons of plastic, 78.81 tons of glass, 32.20 tons of metal and 8.11 tons of aluminum. this should result in a total of approximately mxp $ 911,224.18 (usd $ 71693.48) for the marketing of major recyclables.
Potencial de recuperación de residuos sólidos domésticos dispuestos en un relleno sanitario
Quetzalli Aguilar-Virgen,Carolina Armijo-de Vega,Paul Taboada-González,Xochitl M. Aguilar
Revista de Ingeniería , 2010,
Abstract: Conocer las cantidades y tipos de residuos sólidos domésticos (RSD) que son depositados en el relleno sanitario, brinda la posibilidad de proponer opciones sustentables para su aprovechamiento. Los residuos de cualquier localidad manejados de forma apropiada se pueden convertir en insumos de algún otro proceso. El objetivo de este estudio fue cuantificar los componentes de los RSD susceptibles de ser reciclados, depositados en el relleno sanitario de la ciudad de Ensenada (Baja California, México), para ser valorizados en el mercado de los reciclables. En promedio se podrían comercializar semanalmente 643.67 toneladas de residuos alimenticios para composta, 389.45 toneladas de papel y cartón, 217.55 toneladas de plástico, 78.81 toneladas de vidrio, 37.20 toneladas de metales y 8.11 toneladas de aluminio. Se obtendría en total un aproximado de MXP $911,224.18 (USD $ 71,693.48) por la comercialización de los principales reciclables./ Knowing the amount and type of Domestic Solid Waste (DSW) that is deposited in the landfill gives us the possibility to consider options in how to make sustainable use of it. Waste from any location, if properly handled, can be turned into the raw material for other processes. The aim of this study was to quantify the components of the DSW likely to be recycled, deposited in the landfill in the city of Ensenada, Baja California, Mexico, so that they could be valued on the market as recyclables. The average weekly market could be 643.67 tons of food waste for composting, 389.45 tons of paper and cardboard, 217.55 tons of plastic, 78.81 tons of glass, 32.20 tons of metal and 8.11 tons of aluminum. This should result in a total of approximately MXP $ 911,224.18 (USD $ 71693.48) for the marketing of major recyclables.
ESTIMACIóN DE LAS CONSTANTES k Y L0 DE LA TASA DE GENERACIóN DE BIOGáS EN SITIOS DE DISPOSICIóN FINAL EN BAJA CALIFORNIA, MéXICO
Quetzalli AGUILAR-VIRGEN,Sara OJEDA-BENíTEZ,Paul TABOADA-GONZáLEZ,Margarito QUINTERO-Nú?EZ
Revista internacional de contaminación ambiental , 2012,
Abstract: En las comunidades de Baja California, México, existen diferencias en las características propias de los sitios que impiden generalizar los parámetros para predecir la generación de biogás. Con el objetivo de proyectar con mayor precisión la generación de biogás, en esta investigación se determinó el índice de generación de metano (k) y el potencial de generación de metano (L0) en cuatro comunidades, dos urbanas (Mexicali y Ensenada) y dos rurales (San Quintín y Vicente Guerrero) de Baja California, México. Se realizaron estudios de caracterización de residuos, se utilizaron como base algunas constantes del Modelo Mexicano de Biogás Versión 2.0, y se siguieron los lineamientos del Panel Intergubernamental sobre Cambio Climático (IPCC). Los resultados muestran que el 64 % de los residuos generados son orgánicos, lo cual influye en el valor de los parámetros k y L0. Los valores de los parámetros promedio obtenidos en los cuatro sitios de estudio son similares a los rangos establecidos por el IPCC y el World Bank Group (WBG) (k = 0.0404 por a o y L0 = 73.645 m3/t de residuo). En algunos modelos los parámetros k y L0 ya están preestablecidos, sin embargo, se sabe que la determinación de estos parámetros in situ otorga una mayor certidumbre a la estimación de la generación de biogás.
Potencial de producción eléctrica del biogás generado en un relleno sanitario
Quetzalli Aguilar,Virgen; Taboada-González,Paul; Ojeda-Benítez,Sara;
Ingeniería e Investigación , 2011,
Abstract: energy forms the cornerstone of almost every economic, social and cultural sector in modern societies. energy is regarded as an irreplaceable ingredient in such societies' industrial development. the aim of this research was to estimate the generation of biogas in the city of ensenada's sanitary landfill to ascertain the amount of energy which could be generated from the solid waste being disposed of. biogas estimates were conducted in two stages: a waste characterisation study followed by implementing the regulations proposed by scs engineers (scs engineers, 2009) regarding the mexican biogas model (version 2.0). the results showed that a large quantity of organic matter (around 70%) is a key element in anaerobic degradation of waste. as to energy generation, it is believed that a full 1.90 mw capacity will be reached in 2019. such energy could increase ensenada's current electricity generation capacity by 3.46% and provide 60% of the energy needed for street lighting, thereby leading to usd $1.423 million in savings.
Prevalence and Risk Factors of Toxoplasma gondii Infection in Domestic Cats from the Tropics of Mexico Using Serological and Molecular Tests
Virgen J. Castillo-Morales,Karla Y. Acosta Viana,Eugenia del S. Guzmán-Marín,Matilde Jiménez-Coello,José C. Segura-Correa,A. J. Aguilar-Caballero,Antonio Ortega-Pacheco
Interdisciplinary Perspectives on Infectious Diseases , 2012, DOI: 10.1155/2012/529108
Abstract: The aim of this study was to determine the prevalence and risk factors associated with Toxoplasma gondii infection in domestic cats using an indirect-ELISA (IgM and IgG) and PCR. Samples collected from 220 cats from Merida, Yucatan, Mexico, were analyzed. Cases were reported as acute or chronic. Cases when positive to IgM and IgG and PCR were considered as reactivated chronic infection. Risk factors (sex, age, body condition, diet access to hunting, and number of cats in home) were assessed with a multivariate analysis, 75.5% (166/220) of the cats were IgM and 91.8% (202/220) IgG-seropositive and 79% were PCR-positive (173/220). Number of cats per household and low body condition score were associated with reactivated chronic infection (<0.05). It is concluded that T. gondii is scattered in the studied population with several periods of reinfection, and therefore an environmental contamination with infecting oocysts exists and there are intrinsic associated factors in cats that increase the risk of becoming infected.
Ventanas de oportunidad y coaliciones de política pública: el caso del proyecto para un nuevo aeropuerto en la ciudad de México desde una perspectiva histórica Windows of Opportunity and Public Policy Coalitions: the Case of a Project for a New Airport in México City from a Historical Perspective
J. Carlos Domínguez Virgen
Secuencia , 2011,
Abstract: El presente trabajo ofrece una revisión histórica de las decisiones políticas y de política pública alrededor del proyecto para un nuevo aeropuerto en la ciudad de México. Para ello se auxilia de dos modelos conceptuales dentro del área de políticas públicas: el modelo de vertientes múltiples de John Kingdon (1984) y el modelo de las coaliciones de política de Sabatier y Jenkins-Smith (1993; 1999). En este sentido, las tres principales aportaciones son: 1) la aplicación de estos modelos al área de grandes proyectos de infraestructura en un país latinoamericano; 2) la documentación del caso de estudio desde el punto de vista del proceso de políticas públicas (otros autores ya han documentado el movimiento social en Ateneo y Texcoco en 2001 y 2002); y 3) el análisis de una arena de competencia política, no electoral, así como las implicaciones para la evaluación de proyectos de infraestructura. The paper provides a historical review of the political decisions and public policy surrounding the project for a new airport in México City. To this end, it uses two conceptual models within the public policy area: John Kingdon's multiple flows model and Sabatier and Jenkins Smith's political coalitions model (1993; 1999).In this respect, the main contributions are:1) the application of these models to the area of major infrastructure projects in a Latin American country; 2) the documentation of the case study from the point of view of the public policy process (other authors have already documented the social movement in Ateneo and Texcoco in 2001 and 2002); and 3) the analysis of a sphere of non-electoral political competition as well as the implications for the evaluation of infrastructure projects.
Emergence, Development, and Maturity of the Gonad of Two Species of Chitons “Sea Cockroach” (Mollusca: Polyplacophora) through the Early Life Stages
Omar Hernando Avila-Poveda, Quetzalli Yasú Abadia-Chanona
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069785
Abstract: This study describes and recognises, using histological and microscopical examinations on a morphometrical basis, several gonad traits through the early life stages of Chiton articulatus and C. albolineatus. Gonadal ontogenesis, gonad development stages, sexual differentiation, onset of the first sexual maturity, and growth sequences or “early life stages” were determined. In addition, allometry between lengths and body weight pooled for both sexes per each chiton were calculated using equation Y = aXb. A total of 125 chitons (4≤TL≤40 mm, in total length “TL”) were used. All allometric relations showed a strong positive correlation (r), close to 1, with b-values above three, indicating an isometric growth. Gonadal ontogenesis and gonad development stages were categorised into three periods (“Pw” without gonad, “Pe” gonad emergence, and “Pf” gonadal sac formed) and four stages (“S0” gametocytogenesis, “S1” gametogenesis, “S2” mature, and “S3” spawning), respectively. Compound digital images were attained for each process. Periods and stages are overlapped among them and between species, with the following overall confidence intervals in TL: Pw 6.13–14.32 mm, Pe 10.32–16.93 mm, Pf 12.99–25.01 mm, S0 16.08–24.34 mm (females) and 19.51–26.60 mm (males), S1 27.15–35.63 mm (females) and 23.45–32.27 mm (males), S2 24.48–40.24 mm (females) and 25.45–32.87 mm (males). Sexual differentiation (in S0) of both chitons occurs first as a female then as a male; although, males reach the onset of the first sexual maturity earlier than females, thus for C. articulatus males at 17 mm and females at 32 mm, and for C. albolineatus males at 23.5 mm and females at 28 mm, all in TL. Four early life stages (i.e., subjuvenile, juvenile, subadult, and adult) are described and proposed to distinguish growth sequences. Our results may be useful to diverse disciplines, from developmental biology to fisheries management.
Condiciones financieras que impactan la estructura financiera de la industria de cosméticos y aseo en Colombia Condi es financeiras que impactam a estrutura financeira da indústria de cosméticos e higiene pessoal na Col mbia Financial conditions affecting the financial structure of the cosmetics and household product industries in Colombia
Viviana Virgen Ortiz,Jorge Alberto Rivera Godoy
Cuadernos de Administración , 2012,
Abstract: El artículo identifica las variables influyentes de la estructura financiera de empresas de los subsectores droguería-cosméticos y hogar-aseo para el período 2004-2010, mediante un modelo econométrico de datos panel elaborado con variables explicativas referenciadas en diferentes teorías de la estructura de capital y obtenidas de la información contable de las empresas. Los resultados muestran que la rentabilidad y el costo de la deuda son determinantes de la reducción de los niveles de endeudamiento, pese a que las variables influyentes de la estructura financiera de las empresas que conforman un subsector difieren de manera importante del otro subsector. No se encuentran evidencias que sigan los lineamientos de alguna teoría sobre la estructura de capital en particular. O artigo identifica as variáveis influentes da estrutura financeira de empresas dos subsetores drogaria -cosméticos e lar- higiene, para o período 2004-2010, através de um modelo econométrico de dados em painel, elaborado com variáveis explicativas referenciadas em diferentes teorias da estrutura de capital e obtidas da informa o contável das empresas. Os resultados mostram que a rentabilidade e o custo da dívida s o determinantes da redu o dos níveis de endividamento, apesar das variáveis influentes da estrutura financeira das empresas que conformam um subsetor diferirem de maneira importante em rela o ao outro. N o se encontram evidências que sigam os lineamentos de alguma teoria sobre a estrutura de capital em particular. By means of a panel data econometric model prepared with explanatory variables referred in a series of capital structure theories and measured from the 2004-2010 accounting data of the Colombian drugstore, cosmetics and household product companies, the most influential factors of their corresponding financial structures were identified. Despite the fact that said factors were observed to vary from one sector to another, profitability and debt cost were consistently found to determine debt levels. The results do not especially favor any particular theory of capital structure.
From Age-Sets to Friendship Networks in Comparative Sociology: The continuity of soda among the Boorana of East Africa  [PDF]
Mario I. Aguilar
Sociology Mind (SM) , 2011, DOI: 10.4236/sm.2011.11002
Abstract: This paper re-assesses a comparative sociology of kinship and friendship in East Africa with a particular focus on the Boorana Oromo of Kenya. It argues that the study of kinship dominated the developments of a comparative sociology during colonial times and that the post-colonial influences of war, the market and globalization have increased the role of the individual. As a result a comparative sociology of African kinship needs to be understood in relation to comparative sociological studies of friendship in East Africa, particularly associated with the sociology of education.
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