oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

2019 ( 16 )

2018 ( 26 )

2017 ( 24 )

Custom range...

Search Results: 1 - 10 of 15146 matches for " Sandra Chávez "
All listed articles are free for downloading (OA Articles)
Page 1 /15146
Display every page Item
Costo-Efectividad de Instrumentos Económicos para el control de la contaminación: El Caso del Uso de Le?a
Chávez,Carlos; Gómez,Walter; Brice?o,Sandra;
Cuadernos de economía , 2009, DOI: 10.4067/S0717-68212009000200004
Abstract: we explore the cost-effectiveness of economic incentives to induce changes in wood consumption in urban areas. we consider the case of temuco and padre las casas in southern chile. three incentives schemes are considered: subsidy to the demand of dry wood, subsidy to the supply of dry wood, and enforcement of the standard on the humidity content of wood. the results suggest that subsidies should been targeted to the production of dry wood. the impacts on the aggregate level of emissions are small. finally, enforcing the humidity standard is more cost-effective than the evaluated subsidy programs.
Costo-Efectividad de Instrumentos Económicos para el control de la contaminación: El Caso del Uso de Le a
Carlos Chávez,Walter Gómez,Sandra Brice?o
Cuadernos de Economía , 2009,
Abstract: Exploramos la propiedad de costo-efectividad de utilizar incentivos para inducir cambios en los patrones de consumo de le a en zonas urbanas. Consideramos las comunas de Temuco y Padre Las Casas en el sur de Chile. Evaluamos tres sistemas de incentivos: subsidio a la demanda de le a seca, subsidio al secado de le a, y fiscalización de la norma sobre contenido de humedad de la le a comercializada. Los resultados sugieren orientar subsidios al secado de le a. El impacto sobre el nivel agregado de emisiones de material particulado es acotado. Finalmente, la fiscalización es más costo-efectiva que los programas de subsidio evaluados. We explore the cost-effectiveness of economic incentives to induce changes in wood consumption in urban areas. We consider the case of Temuco and Padre Las Casas in southern Chile. Three incentives schemes are considered: subsidy to the demand of dry wood, subsidy to the supply of dry wood, and enforcement of the standard on the humidity content of wood. The results suggest that subsidies should been targeted to the production of dry wood. The impacts on the aggregate level of emissions are small. Finally, enforcing the humidity standard is more cost-effective than the evaluated subsidy programs.
Degradation of Indigo Carmine Using Advanced Oxidation Processes: Synergy Effects and Toxicological Study  [PDF]
Elba Ortiz, Violeta Gómez-Chávez, Carlos M. Cortés-Romero, Hugo Solís, Rubén Ruiz-Ramos, Sandra Loera-Serna
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.712137
Abstract:
The physicochemical degradation of Indigo Carmine (IC) dye in aqueous solution was performed using single and combined Advanced Oxidation Processes (AOP’s). Photocatalysis (TiO2-UV), Ozonation (O3) and Sonolysis (SN) were tested either in a standalone methodology or by combination of two simultaneous AOP’s. The dye conversion was followed by both measurements: 1) color removal determined by UV-VIS spectrometry and 2) organic and inorganic load determined by the chemical oxygen demand (COD). A complete and quick color disappearance of model water waste has been obtained by using combination of non-irradiated AOP’s, namely, O3/SN, which contrasts to the combination of irradiated photocatalysis with O3 or sonolysis. Color removal with simultaneous TiO2-UV/SN reached 77% while TiO2-UV/O3 reached 96% at similar reaction time. On the other hand, the standalone O3 yielded the highest color removal (94.4%) in 32 minutes whereas SN reached only 39.2% in 4 hours. The standalone light irradiated TiO2-UV reached 93.3% color re-moval in one hour of reaction time. These results indicated that non-irradiated (SN and O3) enhance synergistic effects that provoke structural changes in dye molecule without reaching total degradation. This is evidenced from FTIR of residuals from reaction mixture in which it has been observed the presence of organic molecules such as aromatics, sulfonic and amines refractory compounds that are mechanisti-cally possible to be found during IC degradation. Also, toxicity tests (MicroTox
Uso del Papanicolaou en mujeres que acuden al programa de detección oportuna de cáncer cérvico-uterino: un acercamiento a la satisfacción con el servicio
Vega Chávez,Jesús; Gutiérrez Enríquez,Sandra Olimpia; Terán Figueroa,Yolanda;
Investigación y Educación en Enfermería , 2009,
Abstract: objetive: to describe the satisfaction of service users with the timely detection of cervical cancer through the analysis of indicators and socio-demographic characteristics. methodology: descriptive study. 101 women participate; they have pap test in july 2007 in 13 urban health centers from san luis potosi health department jurisdiction 1. socio-demographic characteristics and use of service indicators are measured, including also satisfaction level. results: the average age is 36 years old. maximum level of education is ninth grade (42.6%) and 54.5% of the participants have popular insurance; 80.2% are married; the women that more attend for the first time are the youngest (18-31 years), and the married ones; and the ones that attend less are those between 51 and 61 years old. those that are more willing for the first time are the married ones; and the ones with less attendance are the divorced, separated and widows. general knowledge about pap test and uterine cervix cancer is adequate in 51.5% and 76.2%, respectively, whereas the accessibility is adequate in 67.3%. satisfaction level was high on waiting time (66.3%); with complete, truthful, opportune, and understandable information (78.2%), as well as an appropriate treatment from health personal (87.1%) and accessibility (80.2%). conclusions: the users are satisfied with the service. in this article we find that papanicolaou test is not associated with women satisfaction. age and marital status are associated to the appointment for the pap.
Interculturalidad y percepciones en salud materno-perinatal, Toribio Cauca 2008-2009
Sandra Felisa Mu?oz Bravo,Edgar Castro,Zindy Alexandra Castro Escobar,Natalia Chávez Narvaez
Revista de la Universidad Industrial de Santander. Salud , 2012,
Abstract: Introducción: la interculturalidad es una propuesta de diálogo, intercambio y complementariedad cultural. Objetivo: analizar los factores relacionados con la atención intercultural en salud de las gestantes del municipio de Toribio 2008-2009. Materiales y Métodos: tipo de estudio cualitativo, etnográfico. Participaron 19 agentes de salud de la Empresa Social del Estado (E.S.E) Cxayutc'e Jxut*, 24 promotores de salud, 10 gestantes Nasa y 6 Parteras y Thewala de la asociación de cabildos indígenas del norte del Cauca. Para la recolección de datos se utilizó una entrevista semiestructurada, encuesta etnográfica y grupo focal. Resultados: las diferencias culturales entre los sistemas médicos tradicionales y facultativos crean barreras alrededor del cuidado de la gestante, determinan la búsqueda de servicios de salud facultativos. Destaca la preservación de los cuidados culturales de la familia Nasa y el reconocimiento de la medicina facultativa. El estudio permitió dilucidar al personal de salud como actor pasivo y poco comprometido. Los agentes aspiran al reconocimiento de las prácticas de salud locales y su incorporación a los sistemas de salud, para fortalecer la atención intercultural e institucional como complemento. Conclusiones: 1. las barreras para la atención intercultural fluctúan entre la divergencia de conceptos, la poca credibilidad, el desconocimiento de las capacidades y limitaciones, experiencias negativas al intentar integrar los dos sistemas de salud. 2. La búsqueda del equilibrio y armonización del cuerpo acompa ado del control prenatal, son actividades de salud de la nativa que gesta y sus prácticas de cuidado, se rigen por los arraigos culturales y la hegemonía familiar como un derecho. Salud UIS 2012; 44 (1): 39-44 Introduction: interculturality is a proposal for dialogue, exchange and complementarity. Objective: Analyse the factors related with attention to intercultural health of the pregnant women of the municipality of Toribio 2008- 2009. Materials and methods: qualitative and ethnographic study. Involving 19 health agents E.S.E Cxayutc'e Jxut*, 24 health promoters, 10 pregnant women Nasa and 6 midwives and Thewala of the Association of indigenous cabildos of north of Cauca. For the collection of data using a semi-structured interview, ethnographic survey, and focus group was used for data collection. Results: cultural differences between the traditional and optional medical systems create barriers around the care of the pregnant woman; it determine the search for optional health services. Highlight the preservation of the care of
Uso del Papanicolaou en mujeres que acuden al programa de detección oportuna de cáncer cérvico-uterino: un acercamiento a la satisfacción con el servicio Use of Pap in women attending early detection of cervical cancer: an approach to meeting the service
Jesús Vega Chávez,Sandra Olimpia Gutiérrez Enríquez,Yolanda Terán Figueroa
Investigación y Educación en Enfermería , 2009,
Abstract: Objetivo: describir la satisfacción de las usuarias con el servicio de detección oportuna de cáncer cérvico-uterino a través del análisis de indicadores y características socio-demográficas. Metodología: estudio descriptivo. Participan 101 mujeres que se someten al Papanicolaou entre junio y julio de 2007 en 13 centros de salud urbanos de la Jurisdicción 1 de la Secretaría de Salud de San Luis Potosí, México. Se aplica una encuesta con tres apartados: características socio-demográficas, indicadores del uso del servicio y nivel de satisfacción. Resultados: la edad promedio de las mujeres es de 36 a os, 42.6% tienen secundaria, 80.2% son casadas y 54.5% están afiliadas al Seguro Popular. Sus conocimientos acerca de la prueba del Papanicolaou y el cáncer son adecuados (51.5% y 76.2%, respectivamente), mientras que la accesibilidad a la prueba de tamizaje es adecuada en un 67.3%; las mujeres que más se presentan a la prueba por primera vez son las de 18 a 30 a os y las casadas; asisten en menor proporción las de 51 a 61 a os. El nivel de satisfacción es alto respecto al tiempo de espera, 66.3%; consideran la información completa, veraz, oportuna y comprensible 78.2%, y encuentran adecuado el trato 87.1%, Conclusiones: las usuarias están satisfechas con el servicio. En este estudio no se encuentra asociación entre la utilización de la prueba del Papanicolaou y la satisfacción de las usuarias; sin embargo, hay asociación entre la primera cita y la edad para realizarse el tamizaje y entre el estado civil y la edad de la primera cita al Papanicolaou. Objetive: to describe the satisfaction of service users with the timely detection of cervical cancer through the analysis of indicators and socio-demographic characteristics. Methodology: descriptive study. 101 women participate; they have PAP test in July 2007 in 13 urban health centers from San Luis Potosi Health Department Jurisdiction 1. Socio-demographic characteristics and use of service indicators are measured, including also satisfaction level. Results: the average age is 36 years old. Maximum level of education is ninth grade (42.6%) and 54.5% of the participants have Popular Insurance; 80.2% are married; the women that more attend for the first time are the youngest (18-31 years), and the married ones; and the ones that attend less are those between 51 and 61 years old. Those that are more willing for the first time are the married ones; and the ones with less attendance are the divorced, separated and widows. General knowledge about PAP test and uterine cervix cancer is adequate in 51.5% and 76.2%, respe
Dinamic of Bacteria Desnitrificants and Nitrificants in the Rizospheric of Wheat with Slow Release of Fertilizer, Irrigated with Waste or Well Water  [PDF]
Sandra Grisell Mora-Ravelo, Francisco Gavi Reyes, Jesús Pérez Moreno, Juan José Pe?a Cabriales, Leonardo Tijerina Chávez, Ma. de Lourdes de la Isla de Bauer
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.34048
Abstract:

The study of the paper about the rhizosphere in the transformation of nitrogen compounds can generate knowledge of the microbial and biochemical atmosphere of the rhizosphere of wheat, for the understanding of the dynamics of the N in agricultural zones, with the purpose of optimizing the fertilizer use and increasing the productivity of the cultures. Therefore, the objective of the present work was to know the effect the rhizosphere in the dynamics of the bacterial populations that take part in the cycle of the N in wheat nourished with slow release fertilizer and one commercial, irrigated with waste water or well. Analyses in the soil took place vertisol used in the experiment with the rhizospheric and non rhizospheric fraction. The slow release fertilizer used has a matrix enriched with N and P and is in the process of being patented (it explains in materials and methods). Each fertilizer was evaluated and the combination of the slow release fertilizer with organic fertilizer. The technique of the number most probable was used (MNP) to carry out the quantification of the nitrificants and denitrificants bacteria to the 55, 67 and 97 days after sowing (Dds). The results obtained for the MNP of denitrificants bacteria and Nitrosomonas indicate that the effect average of the types of water, soil and fertilizers, as well as their interaction to each other was not significant (p > 0.05). The effect of the fertilizing type and soil (rhizospheric and non rhizospheric) in the MNP of Nitrobacter was significant (p < 0.05). The tendencies show that the non rhizospheric soil is more favorable for the development of denitrificants bacteria and Nitrobacter, whereas the MNP of Nitrosomonas was greater in rhizospheric soil.

Morfogénesis in vitro de dioon merolae de Luca, Sabato & Vázquez-Torres (zamiaceae, cycadales) a partir de megagametofitos y embriones cigóticos
Cabrera Hilerio,Sandra Luz; Chávez ávila,Victor Manuel; Sandoval Zapotitla,Estela; Litz,Richard E; Cruz Sosa,Francisco;
Interciencia , 2008,
Abstract: organogenic cultures were induced from zygotic embryo and megagametophyte explants of the chiapas state (méxico) endangered cycad species, dioon merolae. the litz induction medium consisted of b5 major salts, ms medium minor salts and the organics glutamine (400mg·l-1), arginine (100mg·l-1), asparagines (100mg·l-1), sucrose (60g·l-1), gellan gum (4g), and supplemented with 0, 0.45, 2.26, 4.52 and 9.05μm 2,4-dichlorophenoxyacetic acid (2,4-d) and 0, 2.32, 4.60, 9.30, 13.90μm kinetin (k), arranged as a 5′5 factorial in a randomized block design. cultures were maintained in darkness at 25°c, and callus was subcultured onto fresh medium at 4 week intervals. callus initiation occurred on a wide range of plant growth regulators (pgr) combinations from megagametophyte explants. in comparison, callus initiation from explanted zygotic embryos occurred on few pgr combinations. adventitious shoot induction occurred from callus on formulations with k and 2,4-d. through the histological analysis of longitudinal sections of zygotic embryos were detected apical meristematic cells of the shoot and root and in megagametophytes the formation of elements similar to tracheids and coralloid roots. this technique has a great potential for preservation of the highly endangered cycads.
Interculturalidad y percepciones en salud materno-perinatal, Toribio Cauca 2008-2009
Mu?oz Bravo,Sandra Felisa; Castro,Edgar; Castro Escobar,Zindy Alexandra; Chávez Narvaez,Natalia; Ortega Rodriguez,Diana Marcela;
Revista de la Universidad Industrial de Santander. Salud , 2012,
Abstract: introduction: interculturality is a proposal for dialogue, exchange and complementarity. objective: analyse the factors related with attention to intercultural health of the pregnant women of the municipality of toribio 2008- 2009. materials and methods: qualitative and ethnographic study. involving 19 health agents e.s.e cxayutc'e jxut*, 24 health promoters, 10 pregnant women nasa and 6 midwives and thewala of the association of indigenous cabildos of north of cauca. for the collection of data using a semi-structured interview, ethnographic survey, and focus group was used for data collection. results: cultural differences between the traditional and optional medical systems create barriers around the care of the pregnant woman; it determine the search for optional health services. highlight the preservation of the care of cultural for the nasa family and the recognition of optional medicine. the study allowed to elucidate the committed staff of health as a passive actor uncommitted. the agents aspire to recognize local health practices and its incorporation into the health systems, to strengthen attention to intercultural and institutional as complement. conclusions: 1.barriers to intercultural care range from the divergence of concepts, the little credibility, lack of knowledge of the capabilities and limitations, negative experiences when trying to integrate the two systems of health. 2.the search for balance and harmonization of the accompanied by prenatal body, are health activities of the native that gestated and care practices, are governed by the cultural locally and family hegemony as a right. salud uis 2012; 44 (1): 39-44
Predicting Ecosystem Response to Perturbation from Thermodynamic Criteria  [PDF]
V. Alonso Chávez, K Michaelian
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.226073
Abstract: The response of ecosystems to perturbations is considered from a thermodynamic perspective by acknowl-edging that, as for all macroscopic systems and processes, the dynamics and stability of ecosystems is sub-ject to definite thermodynamic law. For open ecosystems, exchanging energy, work, and mass with the en-vironment, the thermodynamic criteria come from non-equilibrium or irreversible thermodynamics. For ecosystems during periods in which the boundary conditions may be considered as being constant, it is shown that criteria from irreversible thermodynamic theory are sufficient to permit a quantitative prediction of ecosystem response to perturbation. This framework is shown to provide a new perspective on the popula-tion dynamics of real ecosystems.
Page 1 /15146
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.