Pozzolanic Reaction of a Biomass Waste as Mineral Addition to Cement Based Materials: Studies by Nuclear Magnetic Resonance (NMR)

Sagrario Martinez-Ramirez,Moises Frias,Erika Y. Nakanishi,Holmer Savastano Jr. 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.4

Non-fossil alternative fuels from biomass (agro-industrial, forestry and fodder plants) focus on getting cleaner, cheaper and more environmentally friendly energy sources directly related to the sustainable development of future societies. The resulting ash produced from the biomass calcination is a viable alternative for use as supplementary cementing materials in the construction industry. This study explores the scientific knowledge of calcium-silicate hydrate (C-S-H) gel formation during pozzolanic reaction between the biomass ash and calcium hydroxide through nuclear magnetic resonance technique with two different types of elephant grass ash that have different microstructure. The ash with the highest initial percentage of Q⁴ and Q³ units was found to react most actively and give rise to gels with the greatest inter-tetrahedral connectivity. In contrast, ash with higher content of total SiO₂, exhibited lower reactivity and the C-S-H gel formed is characterised by low inter-tetrahedral connectivity from the earliest ages. Evaluation of C-S-H gel by nuclear magnetic resonance (NMR), as main hydrated phase for the engineering properties, revealed the potential of this tool to determine the effectiveness of this type of grass as raw material in cementing matrices through the evolution of the microstructure of the gel C-S-H formed.

Aculturación Y Estilos de Vida de Los Migrantes Mexicanos en Estados Unidos

Sagrario Garay Villegas,Juan Martell Muñoz 부산외국어대학교 이베로아메리카연구소 2015 이베로아메리카 Vol.17 No.1

El flujo migratorio de mexicanos que se dirigen a Estados Unidos es un hecho conocido y documentado desde hace varias décadas. Las variaciones en las características de los migrantes y en su monto hace que cada vez se torne más complejo el estudio de este fenómeno, y al mismo tiempo permite que se deriven una serie de temas asociados con el desplazamiento, la adaptación de los migrantes en el país receptor y las implicaciones que se originan tanto en los migrantes como en su entorno. En particular en este artículo se tiene como objetivo principal mostrar el papel de la aculturación (vista a través del dominio del idioma inglés) en los estilos de vida de los migrantes mexicanos en Estados Unidos. Para llevar a cabo lo anterior se hace una discusión amplia sobre los procesos migratorios, la aculturación y los estilos de vida de los migrantes; además a partir de la Hispanic Health Care Survey 2007, se realiza una aproximación empírica de los estilos de vida de los migrantes mexicanos más y menos aculturizados. Palabras Clave: Migrantes, Aculturación, Estilos de Vida y Salud. The flow of Mexicans who go to the United States has been studied for several decades. The changes in the amount and the characteristics of the migrants makes more and more complex the study of this phenomenon and, at the same time, it allows to derive a number of issues associated with their displacement, the adaptation of migrants in the host country and the implications that arise both migrants and their context. In particular in this article is aimed to show the role of acculturation (view through the dominance of the English language) on lifestyles of Mexican migrants in the United States. To carry out the above we present a wide discussion on migratory processes, acculturation and the lifestyles of migrants. In addition, we use as source of data the Hispanic Health Care Survey 2007, like an empirical approximation to show the relation between acculturation, lifestyles and health of the Mexican migrants in United States. Key Words: Migrants, Acculturation, Lifestyles and Health

LA COMUNICACI?N E INTERACCI?N DE LAS PAREJAS QUE TRABAJAN EN M?XICO [NACI?N] Y NUEVO LE?N Una versi?n preliminar de este art?culo fue presentada en el VII Coloquio Internacional sobre Pol?ticas Socia

Blanca E. Cavazos Cisneros,Sagrario Garay Villegas Institute of Iberoamerican Studies Pusan Universit 2013 International Journal of Latin American Studies Vol.3 No.1

Resumen. En los últimos cincuenta años México ha experimentado grandes transformaciones políticas, económicas, sociales, culturales y demográficas. Uno de esos cambios ha sido la creciente incorporación de las mujeres al mundo del trabajo extradoméstico, mismo que ha implicado importantes modificaciones en las formas tradicionales de vida familiar y laboral. Los cambios a nivel macro social de las últimas décadas impactan en la estructura de los hogares considerados tradicionales en México, donde el hombre jugaba el rol de único proveedor y la mujer de ama de casa, modificándose la dinámica de las familias y las parejas conyugales, esto último puede tener su expresión en los procesos de comunicación e interacción. Estos aspectos se revisarán en este trabajo a través de la comparación y análisis descriptivo de la información obtenida en dos encuestas, una a nivel nacional y otra a nivel estatal, mismas que proporcionan detalles sobre las relaciones intrafamiliares y de pareja. Entre los principales resultados encontrados se observa que no hay diferencias importantes en la comunicación entre las parejas donde trabajan ambos cónyuges y en donde solo trabaja uno solo, pues la tendencia en términos de expresar sus preocupaciones, problemas y tomar en cuenta la opinión del otro son muy parecidas entre los distintos tipos de parejas en los dos contextos analizados. Otro de los resultados es el asociado con la satisfacción de la vida en pareja, mientras que en Nuevo León los hombres y las mujeres perciben su relación más satisfactoria, a nivel nacional dicha percepción es menor. Abstract. In the last fifty years Mexico has experienced political, economic, social, cultural and demographic changes. One of these changes has been the increasing incorporation of women to the extradomestic work; it has implicated important modifications in traditional forms of work and family life. The macro changes of the last decades have impacted the traditional structure of households in Mexico, where man played the role of provider and woman of housewife, altering the dynamics of families and marital couples, this last can be expressed in the processes of communication and interaction of couples. These aspects will be reviewed in this paper through the comparison and descriptive analysis of the information obtained in two surveys; one at national level and another at the State level, both provide details on intra-family relations and couple relation. The main results are: there is no important differences in communication between couples where both work and where only works one, because the expression of their concerns, problems and opinions are very similar between different types of couples in the contexts analyzed. Another result is the associated with the satisfaction of life as a couple, while in Nuevo Leon men and women perceive their most satisfying relationship, at the national level this perception is less. Palabras clave: parejas conyugales, trabajo, comunicación, interacción y satisfacción. Key words: cohabiting couples, work, communication, interaction and satisfaction.

Tafamidis for a Transplant Patient with Transthyretin Amyloid Polyneuropathy

Jesús Romero-Imbroda,Teresa Sagrario-Fustero,Clementina Del Canto-Pérez 대한신경과학회 2017 Journal of Clinical Neurology Vol.13 No.4

Valorization of rice bran: Modified supercritical CO2 extraction of bioactive compounds

Oscar Benito-Román,Sandra Varona,María Teresa Sanz,Sagrario Beltrán 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-

In this work, as afirst step in a comprehensive strategy for the valorization of rice bran, the extraction ofoil using supercritical CO2 and ethanol as cosolvent has been studied. The effect of extractiontemperature (40 and 60 C), pressure (30 and 40 MPa) and amount of ethanol used (0, 5 and 10%) has beenconsidered. The quality extracted oil has been evaluated in terms of antioxidant activity, fatty acid profileand bioactive compounds such as phenolics,flavonoids, g-oryzanols, and tocopherols content. Results revealed that, using neat CO2, the best oil in terms of antioxidant activity was obtained at 40 Cand 30 MPa. However, the addition of ethanol as modifier significantly increased the amount of bioactivemolecules extracted and hence the overall antioxidant activity of the oil, which was maximum at 40 MPaand 10% ethanol, regardless the temperature. The use of ethanol also affected the amount of fatty acidsand g-oryzanols extracted.