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Search Results: 1 - 10 of 118555 matches for " TéLLES-ROJO "
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Efecto de la contaminación ambiental sobre las consultas por infecciones respiratorias en ni os de la Ciudad de México
TéLLES-ROJO MARTHA MARíA,ROMIEU ISABELLE,POLO-PE?A MARCO,RUIZ-VELASCO SILVIA
Salud Pública de México , 1997,
Abstract: Objetivo. Modelar la variabilidad en el número de consultas infantiles diarias por motivos respiratorios como consecuencia de los cambios diarios en los niveles de contaminación ambiental, observada en los servicios de urgencias y medicina familiar de un hospital de especialidades del Instituto Mexicano del Seguro Social ubicado en la zona suroeste de la Ciudad de México durante 1993. Material y métodos. Se estudió la correlación entre la presencia de infecciones respiratorias altas y bajas con la exposición a ozono y bióxido de nitrógeno. Para modelar esta asociación se utilizó la técnica de regresión Poisson aplicada sobre modelos de riesgo lineal y no lineal con periodos de latencia entre las mediciones ambientales y la consulta de uno, dos y tres días, así como el promedio de las mediciones de los tres, cinco y siete días previos a la consulta. Resultados. El modelo utilizado estima que un incremento de 50 ppb en el promedio horario de ozono de un día ocasionaría, al día siguiente, un incremento del 9.9% en las consultas de urgencias por infecciones respiratorias altas en el periodo invernal, pudiendo incrementarse hasta en un 30% si el incremento se diera en cinco días consecutivos como promedio. Conclusiones. Los resultados sugieren que la exposición de los menores de 15 a os al ozono y bióxido de nitrógeno inciden significativamente sobre el número de consultas ocasionadas por motivos respiratorios en esta zona de la Ciudad de México.
Efecto de la contaminación ambiental sobre las consultas por infecciones respiratorias en ni?os de la Ciudad de México
TéLLES-ROJO,MARTHA MARíA; ROMIEU,ISABELLE; POLO-PE?A,MARCO; RUIZ-VELASCO,SILVIA; MENESES-GONZáLEZ,FERNANDO; HERNáNDEZ-AVILA,MAURICIO;
Salud Pública de México , 1997, DOI: 10.1590/S0036-36341997000600004
Abstract: objective. to model the variability of medical visits by children for respiratory reasons as a consequence of the daily changes in environmental pollution observed in the emergency and family medicine departments of a hospital of the instituto mexicano del seguro social located in the southwest of mexico city during 1993. materials and methods. the correlation between the presence of upper and lower respiratory tract infections and exposure to ozone and nitrogen dioxide was studied. to model this association, the authors used multivariate poisson regression models with linear and non-linear risk, with lag periods between the environmental measurements and the medical visits of one, two and three days, as well as the average of the measurements of three, five and seven days previous to the visit. results. the model estimates that an increment of 50 ppb in the daily average of ozone would cause an increase of 9.9% in emergency visits due to high respiratory tract infections during the winter, which could rise to 30% if the increment would last five consecutive days in average. conclusions. results suggest that exposure of children younger than 15 years of age to ozone and nitrogen dioxide significantly affect the number of medical visits for respiratory causes in this part of mexico city.
SOBRE AS ORIGENS DA QUEST O AGRáRIA BRASILEIRA
Guilherme Germano Télles Bauer
Revista de História Regional , 2007,
Abstract: O texto aponta para as origens da quest o agrária brasileira, caracterizada pelo predomínio histórico, social e econ mico do sistema latifundiário, determinando a sujei o da maioria da popula o, constituída basicamente de trabalhadores sem terra e pequenos produtores rurais, aos interesses e necessidades da grande produ o, geralmente voltada para o mercado externo. As rela es de produ o e de domina o geradas na época colonial e em grande parte preservadas na zona rural, n o s o somente de ordem econ mica, mas social e ideológica, constituindo obstáculos para uma real tomada de consciência por parte da maioria da popula o rural de suas possibilidade de libertar-se de sua situa o de miséria e opress o. The text points to the origins of the Brazilian agrarian subject, characterized by the social, economic and historical latifundium system prevalence, determining the subjection of most of the population, basically constituted of workers without earth and small rural producers, to the interest and needs of the great production, generally orientated to the external market. The production and dominance relationship generated at the colonial time and largely preserved in the rural zone, are not only of economic, but social and ideological order, constituting obstacles for most of the rural population to get conscious of its possibilities of getting free from a situation of poverty and oppression.
Henrik Jagd, Dorthe Wendt og Ida Westh, red.: Undervisning i TV - idéer til undervisningsforl b
Ellen M?lles?e
MedieKultur : Journal of Media and Communication Research , 1989,
Abstract:
La artesanía, un modelo social y tecnológico para los indígenas
José Roberto Gallegos Téllez Rojo
Política y cultura , 1999,
Abstract: Este trabajo hace una exploración en torno a la conceptualización y fundamentación de la artesanía como eje para la formación de la nacionalidad desde la perspectiva de la antropología mexicana en los primeros a os del México posrevolucionario mediante su teórico más importante, Manuel Gamio. Su función sería doble: herramienta para la incorporación de los grupos indígenas a la sociedad y la economía, y elemento para la definición de la noción de "patria".
Rese a de "Ciencia en los márgenes: una reconsideración de la asimetría centro periferia" de Carlos López Beltrán
José Roberto Gallegos Téllez Rojo
Nueva antropología , 1999,
Abstract:
Rese a de "La historia de la antropología en México: fuentes y transmisión" de Mechthild Rutsch
José Roberto Gallegos Téllez Rojo
Nueva antropología , 1997,
Abstract:
Densidad básica y ancho de anillos de la madera de Pinus patula antes y después de un aclareo
Goche-Télles,Rodolfo; Velázquez-Martínez,Alejandro; Borja-de la Rosa,Amparo; Terrazas,Teresa; Cervantes-Martínez,Cuauhtemoc; Trinidad-Santos,Antonio;
Interciencia , 2003,
Abstract: thinning effect was evaluated on wood density and ring width in pinus patula stands. wood cores were collected at 1.3m height in two site quality forests (3 and 5yr after thinning). each sample was analyzed as to wood density and basic density of growth rings. both site quality and thinning did not influence wood density. absolute wood density values were 0.45 and 0.44g·cm-3 for high site quality before and after thinning, respectively, while in low site quality, absolute wood density values were 0.47 and 0.44g·cm-3, before and after thinning, respectively. in low site quality ring width was affected significantly by thinning with average values of 3.26mm and 2.89mm before and after thinning, respectively. in high site quality there were significant differences in ring width, with values of 2.52 and 2.20 before and after thinning, respectively. thinning did not affect wood density because variation is present in early years of growth.
Problemas Básicos en el Cálculo Mecánico de Catenarias Ferroviarias
Benet,J.; Arias,E.; Cuartero,F.; Rojo,T.;
Información tecnológica , 2004, DOI: 10.4067/S0718-07642004000600012
Abstract: a mechanical study of railway catenaries is carried out, explaining the bases for the formation of the stiffness matrix representing the discretization of the dynamic equations by means of the finite element method. detailed explanations are made of the static problems representing the equilibrium configuration of the line. given the high number of variables which appear, comments are also made on aspects of an informational nature in order to obtain greater computational efficiency in the mathematical treatment of the resultant equations. it is concluded that the variables involved in this study are not independent and are interrrelated. in all cases, carrying out the analysis beginning with simple situations allows successful resolution of the remaining problems
Problemas Básicos en el Cálculo Mecánico de Catenarias Ferroviarias Basic Problems in the Mechanical Calculation of Railway Catenaries
J. Benet,E. Arias,F. Cuartero,T. Rojo
Información Tecnológica , 2004,
Abstract: Se realiza un estudio mecánico de catenarias ferroviarias, explicando las bases para la formación de la matriz de rigidez correspondiente a la discretización de las ecuaciones dinámicas mediante el Método de los Elementos Finitos. Se explican con detalle los problemas estáticos correspondientes a la configuración de equilibrio de la línea. Debido al elevado número de variables que aparecen, se comentan también aspectos de carácter informático con objeto de conseguir una mayor eficiencia computacional en el tratamiento matemático de las ecuaciones resultantes. Se concluye que las variables involucradas en este estudio no son independientes y están interrelacionadas. Sin embargo, al realizar el análisis partiendo de las situaciones básicas, permiten abordar con éxito el estudio del resto de los problemas. A mechanical study of railway catenaries is carried out, explaining the bases for the formation of the stiffness matrix representing the discretization of the dynamic equations by means of the Finite Element Method. Detailed explanations are made of the static problems representing the equilibrium configuration of the line. Given the high number of variables which appear, comments are also made on aspects of an informational nature in order to obtain greater computational efficiency in the mathematical treatment of the resultant equations. It is concluded that the variables involved in this study are not independent and are interrrelated. In all cases, carrying out the analysis beginning with simple situations allows successful resolution of the remaining problems
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