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Sample records for buena fe dos

  1. La buena fe en la concurrencia sobre bienes inmuebles

    Directory of Open Access Journals (Sweden)

    Gastón Fernández Cruz

    1987-12-01

    Full Text Available El presente trabajo representa una apretada síntesis de la tesis titulada "El Papel de la buena fe en la transferencia de la Propiedad Inmueble". con la que el autor optó el grado de bachiller eb  Derecho en la Pontificia Universidad Católica del Perú en diciembre de 1984. Su pretensión no es otra que dejar claramente establecido el rol que representa la buena fe dentro de un sistema consensual de transferencia de la propiedad. cuando el derecho se enfrenta a una situación de excepción ante sucesivas transferencias.realizadas por un mismo sujeto.

  2. Buena fe subjetiva y buena fe objetiva. Equívocos a los que conduce la falta de claridad en la distinción de tales conceptos

    OpenAIRE

    Martha Lucía Neme Villarreal

    2009-01-01

    El presente escrito tiene por objeto dejar en evidencia la confusión que en cierto sector de la jurisprudencia colombiana existe entre el concepto de buena fe objetiva y el concepto de buena fe subjetiva, que ha trascendido, por demás, a una parte de la doctrina y la legislación (C. Co., art. 863), pero, sobre todo, busca advertir sobre los graves equívocos a los que dicha confusión conduce, entre los que se cuentan: asumir que la buena objetiva comprende tanto una buena fe exenta de culpa co...

  3. Buena fe subjetiva y buena fe objetiva. Equívocos a los que conduce la falta de claridad en la distinción de tales conceptos

    Directory of Open Access Journals (Sweden)

    Martha Lucía Neme Villarreal

    2009-12-01

    Full Text Available El presente escrito tiene por objeto dejar en evidencia la confusión que en cierto sector de la jurisprudencia colombiana existe entre el concepto de buena fe objetiva y el concepto de buena fe subjetiva, que ha trascendido, por demás, a una parte de la doctrina y la legislación (C. Co., art. 863, pero, sobre todo, busca advertir sobre los graves equívocos a los que dicha confusión conduce, entre los que se cuentan: asumir que la buena objetiva comprende tanto una buena fe exenta de culpa como una buena fe en la que la diligencia no resulta exigible; pretender que la regla que prohíbe el ir contra los actos propios está regida por la buena fe subjetiva y que es una manifestación de la teoría de la apariencia; pretender proteger a nombre del principio de buena fe la representación mental del deudor que cree haber cumplido, desconociendo la exigencia de la buena fe objetiva que impone desplegar un comportamiento efectivo; y apreciar de manera errónea los alcances de la presunción de buena fe; equívocos que llevan a plantear la necesidad de retomar los senderos del derecho romano, en el que el concepto originario de buena fe estuvo siempre atado al deber de comportamiento probo y leal frente a la otra parte en el contrato, es decir, a lo que hoy entendemos como buena fe objetiva y donde la exigencia de buena fe en la posesión del comprador (convicción o creencia debió ser una utilización particular de la bona fides contractual adaptada en función de la problemática posesoria, que luego se extendería a otras situaciones que se engloban hoy bajo el nombre de la teoría de la apariencia.

  4. Responsabilidad por violación de la buena fe en la sociedad por acciones simplificada

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    Nicolás Polanía Tello

    2012-12-01

    Full Text Available La sociedad por acciones simplificada –SAS–, como los demás esquemas societarios, se funda en y está informada por el principio de la buena fe. Pero a diferencia de los otros modelos, la SAS tiene concreciones particulares de la buena fe que permiten un amparo más efectivo y eficiente de los derechos de los socios y de los terceros, en la medida en que instituciones como el fraude a la ley, el perjuicio injusto a terceros, el abuso del derecho y el administrador de hecho, todos estructurados a partir de violaciones a la buena fe, permiten tramitar los eventos de responsabilidad por ilícitos atípicos y llegar incluso a desestimar por ello el atributo de la limitación de responsabilidad.

  5. El principio general de la buena fe en el contrato de trabajo

    OpenAIRE

    García Viña, Jordi

    2000-01-01

    Còpia digital de l'exemplar imprès de la tesi dipositat a la Biblioteca de la Facultat de Dret La buena fe es uno de aquellos conceptos que presentan unas raíces muy profundas en la historia de la humanidad ya que, incluso antes de la juridificación de las relaciones de los ciudadanos de Roma aparece esta idea. Esta larga historia que la legitima supone que el concepto de la buena fe haya pasado por muchas etapas. Desde interpretaciones que hoy en día claramente serían calificadas como de ...

  6. La presunción de buena fe en el sistema jurídico colombiano: una regla cuya aplicación tergiversada desnaturaliza el principio

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    Martha Lucía Neme Villarreal

    2010-06-01

    Full Text Available Una de las desafortunadas consecuencias de la ausencia de una adecuada diferenciación entre los conceptos de buena fe objetiva y buena fe subjetiva es la aplicación inapropiada de la presunción de buena fe, en cuanto aquello que constituye una excepción al régimen general, esto es, que la buena fe subjetiva posesoria se presume, se ha adoptado como regla general en materia de buena fe objetiva. Una tal generalización de la presunción; desnaturaliza el principio de buena fe, pues la regla general en materia de buena fe objetiva es que el cumplimiento de los deberes de comportamiento que emanan del principio no se presume, sino que se debe probar su efectiva realización, en tanto que los estados psicológicos o las creencias, en los que se funda la buena fe subjetiva, constituyen excepciones a la regla general en cuanto se permite su presunción. El Código de Bello consagra la regla de presunción de buena fe con alcances restringidos a los eventos de buena fe subjetiva y extenderla a situaciones en las que lo aplicable es la buena fe objetiva contraría la esencia misma del principio. En materia administrativa la Constitución colombiana consagra una excepción a la regla general que rige en materia de buena fe objetiva conforme a la cual la buena fe no se presume, al permitir que opere una presunción legal en favor del particular en las gestiones que este adelante ante aquella, como medida para equilibrar las relaciones entre la administración pública y los particulares, relación que se encuentra marcada por una fuerte asimetría.

  7. La presunción de buena fe en el sistema jurídico colombiano: una regla cuya aplicación tergiversada desnaturaliza el principio

    Directory of Open Access Journals (Sweden)

    Martha Lucía Neme Villarreal

    2010-07-01

    Full Text Available Una de las desafortunadas consecuencias de la ausencia de una adecuada diferenciación entre los conceptos de buena fe objetiva y buena fe subjetiva es la aplicación inapropiada de la presunción de buena fe, en cuanto aquello que constituye una excepción al régimen general, esto es, que la buena fe subjetiva posesoria se presume, se ha adoptado como regla general en materia de buena fe objetiva. Una tal generalización de la presunción; desnaturaliza el principio de buena fe, pues la regla general en materia de buena fe objetiva es que el cumplimiento de los deberes de comportamiento que emanan del principio no se presume, sino que se debe probar su efectiva realización, en tanto que los estados psicológicos o las creencias, en los que se funda la buena fe subjetiva, constituyen excepciones a la regla general en cuanto se permite su presunción. El Código de Bello consagra la regla de presunción de buena fe con alcances restringidos a los eventos de buena fe subjetiva y extenderla a situaciones en las que lo aplicable es la buena fe objetiva contraría la esencia misma del principio. En materia administrativa la Constitución colombiana consagra una excepción a la regla general que rige en materia de buena fe objetiva conforme a la cual la buena fe no se presume, al permitir que opere una presunción legal en favor del particular en las gestiones que este adelante ante aquella, como medida para equilibrar las relaciones entre la administración pública y los particulares, relación que se encuentra marcada por una fuerte asimetría.

  8. Buenas prácticas en integración de las TIC en educación en Andalucía : dos estudios de caso

    OpenAIRE

    Boza Carreño, Ángel; Toscano Cruz, María O

    2011-01-01

    Este trabajo muestra resultados parciales del Proyecto de Investigación de Excelencia “Buenas prácticas en integración de TICs en centros de Educación Primaria y Secundaria de Andalucía” (P07- HUM-03035), financiado por la Consejería de Innovación, Ciencia y Empresa. Se trata de un estudio de casos múltiple, del que presentamos aquí dos casos de centros de Educación Primaria, en los que se han utilizado diversas estrategias cualitativas (entrevistas abiertas, observaciones partici...

  9. LA BUENA FE COMO FUNDAMENTO DE LOS DEBERES PRECONTRACTUALES DE CONDUCTA: UNA DOCTRINA EUROPEA EN CONSTRUCCIÓN

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    Vladimir Monsalve Caballero

    2008-01-01

    Full Text Available El ordenamiento jurídico reconoce o admite que la autonomía privada sea el punto de partida y conformación del contrato, pero no hasta el punto de considerar que, así las negociaciones preliminares permitan la concreción de un contrato, este tenga un sistema propio o autónomo, que esté sujeto a los términos incluidos en el texto contractual. Por el contrario, las reglas generales del juego siguen siendo las establecidas por el marco normativo en su conjunto y por tanto comparten una necesaria adecuación del acuerdo contractual (lex privata, a las mismas. Así, el principio de buena fe se hace presente, se extiende de igual forma, en el contenido de eticidad de cada acto que deba examinarse a la luz de las circunstancias particulares, direccionando las conductas humanas y en especial los actos y contratos que gobiernan la convivencia, de tal forma que estas prescripciones generales siempre serán aplicadas, no solo al acuerdo contractual, sino que también estarán llamadas a gobernar todo el proceso tanto de formación, como el de perfeccionamiento y ejecución.

  10. ANÁLISIS CRÍTICO SOBRE LA INCLUSIÓN DEL PRINCIPIO DE BUENA FE PROCESAL EN EL PROYECTO DE CÓDIGO PROCESAL CIVIL CHILENO

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    Francisco Alberto Ruay Suarez

    2013-12-01

    Full Text Available La inclusión de la buena fe procesal como un principio formativo del proceso civil abre una serie de discusiones sobre el fin del proceso y su desarrollo. Implica necesariamente una posición ideológica sobre el alcance de los poderes del Estado. En este artículo el autor pretende mostrar que las consecuencias de su inclusión en nuestro procedimiento civil es nefasta, debido a que vulnera directamente derechos fundamentales como el derecho de defensa, e incluso vulnera el debido proceso, garantía fundamental en cualquier Estado democrático.

  11. VIGENCIA DEL PRINCIPIO DE LA BUENA FE EN EL DERECHO DEL TRABAJO CHILENO Validity of the principle of good faith in the Chilean labor law

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    Pedro Irureta Uriarte

    2011-01-01

    Full Text Available La buena fe es un principio general del Derecho que, en el ámbito laboral, encuentra especial aplicación en la figura del contrato de trabajo. La buena fe es predicable tanto para el trabajador como para el empleador, y se verifica en los estadios previos a la contratación, durante el desarrollo mismo del contrato, así como al momento de la extinción. El Código del Trabajo chileno, sin referirse expresamente a este principio, ha terminado incorporando sus exigencias en distintas figuras laborales; cuestión que no impide que el núcleo esencial del principio se despliegue en toda su magnitud al momento de configurar los derechos y obligaciones de cada parte.Good faith is a general principle of law which, in the workplace, finds special application in the employment contract. This principle acts both from the worker and the employer and has to be present in stages prior to recruitment, during the fulfillment of the contract and the date of termination. The Chilean Labour Code, without explicitly referring to this principle, has incorporated its work demands in different shapes. This special technique does not interfere with a direct spillover of the legal core of that principle when the legal order configures the rights and obligations of each party.

  12. Las buenas practicas espanolas 1998

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    Nasarre y de Goicoechea, Fernando

    2000-02-01

    Full Text Available The II HABITAT Conference held at Istanbul on June 1996, adopted the Habitat Program -Global Action Plan, in within which two performance lines are especially reinforced to reach the two main goals of suitable e housing for all and sustainable human settlements: the collaboration and participation among all the levels of the government and the civil society and, the recognition of the importance of the urban policies. In this framework is addressed the International Award Best Practices for the Improvement of the Life Conditions that, sponsored by the municipality of Dubai, is celebrated every two years and is awarded to the 10 selected by an International Independent Jury. The goal of the Competition is to promote policies and strategies more effective for the sustainable development of the humanity and their settlements, through the transmission of information and knowledge on experiences and solutions proved in the practice. The obtained results in the last international competition, with 32 of the presented Practices included in the Data Base of the United Nations Good Practices, 18 classified among the 100 best (3 of them included among the 40 finalists and finally, one, among the 10 awarded (Programs for the improvement of the urban environment of Malaga, allow us to look forward with satisfaction the panorama of the urban policy in our country.La Conferencia HABITAT II celebrada en Estambul en junio de 1996 adopto el Programa Hábitat-Plan Global de Acción-, dentro del cual se refuerzan especialmente dos líneas de actuación: la colaboración y participación entre todos los niveles de gobierno y la sociedad civil y el reconocimiento de la importancia de las políticas urbanas para alcanzar los dos objetivos principales: vivienda adecuada para todos y asentamientos humanos sostenibles. En este marco se inscribe el Concurso Internacional de Buenas Practicas para la Mejora de las Condiciones de Vida que, patrocinado par la municipalidad

  13. Variables docentes y de centro que generan buenas prácticas con TIC

    OpenAIRE

    María Pilar COLÁS BRAVO; Casanova Correa, Juan

    2010-01-01

    En este artículo se presentan los resultados de un estudio de casos llevado a cabo mediante entrevistas narrativas, cuyo objetivo es identificar los factores condicionantes de las buenas prácticas con TIC. Las buenas prácticas con TIC están relacionadas con dos áreas científicas de estudio. Una referida a la integración de las TIC en los sistemas educativos y otra ligada a procesos de innovación. En esta aportación se presenta el estado de la cuestión respecto a factores condic...

  14. Knowledge and attitudes towards food safety and reported use of good production practices among a sample of cattle producers in Santa Fe, Argentina Conocimiento y actitudes hacia seguridad alimentaria y buenas prácticas de producción adoptadas en productores ganaderos de Santa Fe, Argentina

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    I Young

    2012-01-01

    Full Text Available On-farm implementation of good production practices (GPP and effective translation of food safety knowledge to food-animal producers are recommended to achieve a safer food supply. A pilot study was conducted during 2009-2010 to assess the knowledge and attitudes towards food safety and reported use of GPp among a sample of 930 cattle producers in Santa Fe, Argentina. A response percentage of 31.8% (n = 296 was obtained. Several respondents indicated that they rarely or never isolate sick cattle (25.8%, keep records of diseases (32.5% or antimicrobial use (43.3%, and ensure that farm visitors and employees, respectively, wash their hands (79.2% and 31.2% and wear protective clothing (79.0% and 31.3%. Respondents' median use of 13 GPp was calculated and evaluated in a multivariable ordinal regression model. Previous training in food safety (OR = 2.59, often (OR= 5.89 or always (OR= 6.33 discussing food safety with the veterinarian, and being a dairy producer compared to cow-calf producer (OR= 3.86 were associated with a higher median use of GPP. Approximately 40% of the total variation in respondents' median use of GPp was attributable to veterinarians, indicating that they should have an important role in the education of cattle producers about food safety in Santa Fe. These preliminary results should be used to inform future research and decision-making about food safety and GPp in cattle production in Argentina.La implementación de buenas prácticas de producción (BPP en establecimientos pecuarios y la traducción efectiva de conocimiento sobre inocuidad de los alimentos a productores agropecuarios se recomienda para un suministro de alimentos más seguros. Un estudio piloto fue realizado durante 2009-2010 para evaluar el conocimiento y las actitudes hacia la inocuidad de los alimentos y el uso de BPP entre 930 ganaderos en Santa Fe, Argentina. El porcentaje de respuestas de las encuestas fue 31,8% (n = 296. Varios encuestados indicaron que

  15. VARIABLES DOCENTES Y DE CENTRO QUE GENERAN BUENAS PRÁCTICAS CON TIC TEACHER AND SCHOOL VARIABLES THAT GENERATE GOOD PRACTICES WITH ICT

    OpenAIRE

    Pilar Colás Bravo; Juan Casanova Correa

    2010-01-01

    En este artículo se presentan los resultados de un estudio de casos llevado a cabo mediante entrevistas narrativas, cuyo objetivo es identificar los factores condicionantes de las buenas prácticas con TIC. Las buenas prácticas con TIC están relacionadas con dos áreas científicas de estudio. Una referida a la integración de las TIC en los sistemas educativos y, otra ligada a procesos de innovación. En esta aportación se presenta el estado de la cuestión respecto a factores condicionantes de l...

  16. Convivencia escolar. Un estudio sobre buenas prácticas

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    María José Caballero Grande

    2010-06-01

    Full Text Available Este trabajo de investigación se centra en la convivencia escolar y puede enmarcarse en la línea de educación para la paz.La finalidad del mismo ha sido conocer algunas peculiaridades de prácticas educativas que fomentan la paz y la convivencia en el ámbito escolar. Para esto, se ha recogido información, mediante entrevista estructurada, en diez centros educativos de la provincia de Granada, acogidos a la Red Andaluza “Escuela, espacio de paz”, sobre la puesta en marcha, desarrollo y evaluación de actuaciones encaminadas hacia la cohesión del grupo, la gestión democrática de normas, la educación en valores, las habilidades socioemocionales y la regulación pacífica de conflictos.Del análisis de las entrevistas, se desprende que hay una serie de medidas y actuaciones que se llevan a cabo en los centros educativos que favorecen la buena convivencia. La necesidad de cooperación entre todos los actores intervinientes en el proceso educativo o la importancia de sistematizar e institucionalizar el trabajo que eduque para el fomento de una cultura de paz, conforman entre otras las conclusiones a las que se llega en este estudio.

  17. Manual de Buenas Prácticas Ambientales. EMPAI

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    Jacqueline Perera Morales

    2008-01-01

    Full Text Available Para lograr una armonía con el entorno, es necesario que todos los trabajadores, técnicos y dirigentes cumplan con su responsabilidad social, promoviendo la conservación, mejoramiento y no contaminación de los recursos naturales y el medio ambiente. La capacitación concientiza y crea competencia; por lo tanto, todo el personal cuyo trabajo produzca un impacto significativo al ambiente debe recibir una capacitación apropiada. De esta forma logramos que todos los especialistas adquieran una mayor capacidad de respuesta y como resultado entreguen diseños más comprometidos, que incluyan como aspectos principales la sostenibilidad de los recursos. Con la confección del Manual de Buenas Prácticas Ambientales. EMPAI, pretendemos trabajar mediante una educación ambiental planificada, sustentada en un proceso educativo que no sólo busca incrementar los conocimientos de nuestros trabajadores y directivos en general, sino también que se comprendan las interacciones fundamentales entre los seres humanos y la naturaleza, y los efectos que sobre ésta, nuestro proceso productivo puede causar; todo ello con un fin concreto: la acción participativa hacia el mejoramiento ambiental.

  18. Conceptual management plan Ellicott Slough National Wildlife Refuge proposed Buena Vista addition

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — 2005 Conceptual Management Plan for Ellicott Slough proposed Buena Vista addition. Content includes information of the National Wildlife Refuge System, refuge...

  19. Conceptual management plan Ellicott Slough National Wildlife Refuge proposed Buena Vista addition

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The 289-acre Buena Vista Property consists of three parcels; one consisting of approximately 187 acres, one consisting of approximately 100 acres, and another...

  20. Land protection plan Ellicott Slough National Wildlife Refuge proposed Buena Vista addition [2004

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Land Protection Plan, as part of the Environmental Assessment, Land Protection Plan and Conceptual Management Plan for the proposed Buena Vista addition to the...

  1. Environmental assessment Ellicott Slough National Wildlife Refuge proposed Buena Vista addition [2005

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The purpose of acquiring the Buena Vista property is to enhance survival prospects of endangered species in the area and provide opportunities for compatible...

  2. Parcels and Land Ownership, Published in 2011, Buena Vista City Government.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Parcels and Land Ownership dataset as of 2011. The extent of these data is generally Buena Vista City County, VA. This metadata was auto-generated through the...

  3. Malheur National Wildlife Refuge: Narrative Report: 1936: Camp Buena Vista BF-3: 1: July

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This narrative report from the Civilian Conservation Corps summarizes activities done on Camp Buena Vista. Topics include land development and maintenance, wildlife...

  4. 75 FR 26794 - Alticor, Inc., Including Access Business Group International LLC and Amway Corporation, Buena...

    Science.gov (United States)

    2010-05-12

    ... Employment and Training Administration Alticor, Inc., Including Access Business Group International LLC and Amway Corporation, Buena Park, CA; Alticor, Inc., Including Access Business Group International LLC, and... 12, 2010, applicable to workers of Alticor, Inc., including Access Business Group International...

  5. 76 FR 45878 - Alticor, Inc., Including Access Business Group International LLC and Amway Corporation, Buena...

    Science.gov (United States)

    2011-08-01

    ... Employment and Training Administration Alticor, Inc., Including Access Business Group International LLC and Amway Corporation, Buena Park, CA; Alticor, Inc., Including Access Business Group International LLC and..., Ada, MI; Alticor, Inc., Including Access Business Group International LLC and Amway...

  6. Buenas prácticas ambientales para la gestión de residuos de papel

    OpenAIRE

    Sansano Del Castillo, Irene

    2013-01-01

    La guía proporciona indicaciones sobre la importancia de la recogida selectiva de los residuos de papel y cartón en la UPV así como consejos útiles y buenas prácticas para minimizar el residuo o el impacto ambiental de los mismos Sansano Del Castillo, I. (2013). Buenas prácticas ambientales para la gestión de residuos de papel. http://hdl.handle.net/10251/33735.

  7. Derecho a la buena administración electrónica

    OpenAIRE

    Sánchez Acevedo, Marco Emilio

    2015-01-01

    Existe un derecho a la “buena administración”, consagrado en la Carta de Derechos Fundamentales de la Unión Europea —Título V, sobre “Ciudadanía”; artículo 41, sobre el “Derecho a una buena Administración”— y es indudable que la “buena administración” constituye un verdadero “derecho” de los ciudadanos y una obligación de las administraciones públicas que ha calado en la legislación y en la jurisprudencia como expresión aglutinante de su buen funcionamiento y que se ha positivado en una seri...

  8. VARIABLES DOCENTES Y DE CENTRO QUE GENERAN BUENAS PRÁCTICAS CON TIC TEACHER AND SCHOOL VARIABLES THAT GENERATE GOOD PRACTICES WITH ICT

    Directory of Open Access Journals (Sweden)

    Pilar Colás Bravo

    2010-02-01

    Full Text Available En este artículo se presentan los resultados de un estudio de casos llevado a cabo mediante entrevistas narrativas, cuyo objetivo es identificar los factores condicionantes de las buenas prácticas con TIC. Las buenas prácticas con TIC están relacionadas con dos áreas científicas de estudio. Una referida a la integración de las TIC en los sistemas educativos y, otra ligada a procesos de innovación. En esta aportación se presenta el estado de la cuestión respecto a factores condicionantes de las buenas prácticas desde ambas perspectivas. A partir de ahí situamos el marco teórico de este trabajo desde la perspectiva del profesorado. El análisis cualitativo realizado mediante el software científico Atlas.Ti 5.0 saca a la luz variables personales y contextuales asociadas a los procesos de innovación. In this article the results of a case study carried out are presented by means of narrative interviews, whose objective is to identify the determining factors of the good practices with ICT. The good practices with ICT are related to two scientific areas of study. One, above mentioned, related to the integration of the ICT in the educational systems and, another, connected with processes of innovation. In this contribution we present the state of the question related to determining factors of the good practices from both points of view. From there we situate the theoretical framework of this work since the perspective of the teachers. The qualitative analysis carried out by means of the program AtlasTi identifies personal and contextual factors associated to the processes of innovation.

  9. Código de buenas prácticas en la publicidad en la movilidad

    OpenAIRE

    Pedrós Pérez, Gerardo

    2012-01-01

    Se plantea como estrategia para reducir las emisiones de gases de efecto invernadero y avanzar hacia un modelo de movilidad más sostenible el fomento de una publicidad responsable. Se proponen códigos de buenas prácticas en la publicidad de la movilidad.

  10. 77 FR 40705 - Endangered and Threatened Wildlife and Plants; Designation of Critical Habitat for Buena Vista...

    Science.gov (United States)

    2012-07-10

    ... sources may include the recovery plan for the species, articles in peer-reviewed journals, conservation... for the Buena Vista Lake shrew in the Federal Register on October 21, 2009 (74 FR 53999). Based on new... a revised draft economic analysis. On April 28, 2011, we announced in the Federal Register (76...

  11. Barreras para la integración de buenas prácticas con TIC. Estudio de caso.

    Directory of Open Access Journals (Sweden)

    Siria Padilla Partida

    2015-12-01

    Full Text Available Esta investigación analiza las barreras u obstáculos para la integración de las buenas prácticas educativas con TIC, en la segunda más grande universidad pública de México: La Universidad de Guadalajara. Se analiza el caso del Centro Universitario de Ciencias Económico Administrativas (CUCEA, el cual es uno de los 15 centros universitarios que integran la red universitaria de la UdeG. Para esta investigación fue diseñado un cuestionario cerrado, tipo rubrica, con una escala de 5 puntos que iba desde no se ha iniciado hasta consolidado, para poder identificar cuáles eran los principales obstáculos percibidos por los profesores para integrar las TIC en las prácticas educativas. El cuestionario estuvo dividido en dos partes, la primera exploraba las barreras atribuidas a la institución educativa, y la segunda, las barreras atribuidas a los profesores. El muestreo fue representativo y aleatorio, con una muestra de 210 profesores de un total de 460. Los resultados identificaron como los mayores obstáculos: La falta de incentivos para integrar las TIC en la enseñanza con 382 puntos de un total de 1055, la falta de flexibilidad curricular con 483 puntos, y por último, la falta de confianza en la educación a distancia con 583 puntos.

  12. Buenas prácticas ambientales para el consumo de papel

    OpenAIRE

    Bellver Navarro, Carmen Gemma

    2013-01-01

    Se describen someramente las características del proceso de fabricación del papel que tienen un impacto sobre el medio ambiente, así como la forma en la que se puede minimizar o mitigar ese impacto y las etiquetas ambientales que garantizan una fabricación sostenible Bellver Navarro, CG. (2013). Buenas prácticas ambientales para el consumo de papel. http://hdl.handle.net/10251/33734.

  13. Early archosauromorph remains from the Permo-Triassic Buena Vista Formation of north-eastern Uruguay

    Directory of Open Access Journals (Sweden)

    Martín D. Ezcurra

    2015-02-01

    Full Text Available The Permo-Triassic archosauromorph record is crucial to understand the impact of the Permo-Triassic mass extinction on the early evolution of the group and its subsequent dominance in Mesozoic terrestrial ecosystems. However, the Permo-Triassic archosauromorph record is still very poor in most continents and hampers the identification of global macroevolutionary patterns. Here we describe cranial and postcranial bones from the Permo-Triassic Buena Vista Formation of northeastern Uruguay that contribute to increase the meagre early archosauromorph record from South America. A basioccipital fused to both partial exoccipitals and three cervical vertebrae are assigned to Archosauromorpha based on apomorphies or a unique combination of characters. The archosauromorph remains of the Buena Vista Formation probably represent a multi-taxonomic assemblage composed of non-archosauriform archosauromorphs and a ‘proterosuchid-grade’ animal. This assemblage does not contribute in the discussion of a Late Permian or Early Triassic age for the Buena Vista Formation, but reinforces the broad palaeobiogeographic distribution of ‘proterosuchid grade’ diapsids in Permo-Triassic beds worldwide.

  14. Ética y estética de la conducta en los manuales de buenas maneras españoles Ética y estética de la conducta en los manuales de buenas maneras españoles

    Directory of Open Access Journals (Sweden)

    Fernando Ampudia de Haro

    2007-03-01

    Full Text Available The aim of the article is to give the reader a general idea as to established relationships between ethics and appearances in social conduct as they have appeared in various good manuals on social behaviour from medieval times to present.In relation to this, many proposals from varying viewpoints have been presented dealing with the decline of moral content in such manuals. Ultimately these manuals propose two comprehensive models concerning the relationship between ethics and appearances, refered to as aristotalian and kantian respectively.El propósito del artículo es efectuar una aproximación general al tipo de relación que se establece entre ética y estética de la conducta tal y como ésta ha sido planteada en los diferentes manuales de buenas maneras que se han publicado en España desde la Baja Edad Media hasta nuestros días. Se proponen, a partir de esos mismos manuales, dos modelos comprensivos de las relaciones entre ética y estética del comportamiento aquí denominados aristotélico y kantiano respectivamente. Por último, se presentan diversas propuestas explicativas en torno a la disolución del contenido moral de las buenas maneras en tales manuales.

  15. Buenas plumas

    Directory of Open Access Journals (Sweden)

    Jimena Montaña Cuéllar

    2014-03-01

    Full Text Available El periodismo en Antioquia. Juan José Hoyos (selección y prólogo. Biblioteca Pública Piloto. Concejo de Medellín, Alcadía de Medellín,Secretaría de Cultura Ciudadana de Medellín, 2003. 502 págs.

  16. Construyendo buenos ciudadanos con buenas prácticas en salud: dengue e influenza AH1N1 en Cali, Colombia

    Directory of Open Access Journals (Sweden)

    Alejandro Arango

    2013-06-01

    Full Text Available Este artículo discute la relación entre la dimensión biológica de las enfermedades y los hábitos de auto-cuidado o “conductas saludables”. Su pregunta central indaga por cómo un fenómeno aparentemente biológico genera ciertas “buenas prácticas” en torno a la salud, defendiendo la idea de la enfermedad como un asunto socio-cultura, más que un mero hecho biológico. El estudio aquí presentado se apoya en una investigación realizada en la ciudad de Cali y enfocada en dos enfermedades, dengue e influenza AH1N1, entre 2009 y 2010. El examen de la relevancia adquirida por estas dos dolencias, mostrará cómo la biología y las prácticas de auto-cuidado tienen una estrecha relación entre sí.

  17. Riesgos del desarrollo y demarcación judicial de la buena ciencia

    OpenAIRE

    Salvador Coderch, Pablo; Rubí Puig, Antoni

    2008-01-01

    Antes de decidir si un productor puede exonerarse de responder por riesgos de desarrollo en un caso de daños causados por un defecto de producto, jueces y tribunales deben examinar la bondad científica de las pruebas aportadas en el pleito por los expertos nombrados a instancia de parte o por el propio tribunal. ¿Hay estándares (meta)científicos generales o específicos para realizar este examen? O en otras palabras, ¿qué significa buena ciencia en el ámbito de la responsabilidad de producto y...

  18. Dos visiones sobre la planificación regional en el final del auge desarrollista: las propuestas de orientación del crecimiento urbano (Santa Fe, Argentina, 1980

    Directory of Open Access Journals (Sweden)

    Gisela Ariana Rausch

    2013-12-01

    Full Text Available El desarrollismo de la segunda posguerra -en sus diferentes vertientes- llevó a su máxima expresión el ideal moderno de instrumentalización de la naturaleza como vía del mejoramiento social. En Argentina (como en América Latina, se adoptarían una variedad de prescripciones surgidas, principalmente, de la Comisión Económica para América Latina (CEPAL, mientras la disciplina urbanística sufriría una transformación profunda de sus bases teóricas, produciéndose un pasaje del “Urbanismo” al “planeamiento”. Esto como correlato directo del pasaje de una concepción “jurisdiccional” del territorio de intervención, a otra concepción “regional”. A partir de ello, se expondrán dos propuestas de crecimiento urbano para la ciudad de Santa Fe, una asentada en el desarrollismo tecnocrático, que hizo énfasis en las infraestructuras como medio técnico de control de la naturaleza, y la otra, más híbrida y alternativa, que hizo foco en la especificidad geográfica y cultural santafesina.

  19. INDICADORES Y CRITERIOS DE CALIDAD DE BUENAS PRÁCTICAS COEDUCATIVAS. UNA PROPUESTA INNOVADORA

    Directory of Open Access Journals (Sweden)

    Francisco Javier Saavedra Macías

    2013-01-01

    Full Text Available Este trabajo se plantea en el marco del proyecto Teon XXI sobre uso de las TIC aplicadas a la coeducación. En este contexto nuestro objetivo es la elaboración de una escala observacional para evaluar buenas prácticas coeducativas, que sirva de complemento a las metodologías cualitativas habitualmente utilizadas. El instrumento se compone de cinco criterios o indicadores de calidad (eficacia, efecto transformador, sostenibilidad, legitimidad, replicabilidad definidos en base a conceptos clave que articulan una graduación a intervalos oscilante entre 0 y 4. Los resultados de la aplicación por cuatro jueces a diez prácticas seleccionadas de centros escolares andaluces por su relevancia coeducativa mostraron su adecuada fiabilidad. Concluimos la conveniencia del proceso mismo de construcción de este tipo de escalas como vehículo para la reflexión sobre el concepto de buena práctica, dada su multidimensionalidad y complejidad de definición. Asimismo, se recomienda el análisis desagregado de los distintos criterios para su evaluación.

  20. Mid-late Holocene environments of Agua Buena locality (34050'S; 69056'W), Mendoza, Argentina

    International Nuclear Information System (INIS)

    In southern South America the acquisition of high-quality Holocene paleoclimate data is a priority due to the paucity of complete, continuous and well dated records. Here we report preliminary results from a combined sedimentological and palynological study of an alluvial fan sequence and the laterally connected sedimentary deposits of the Vega de la Cueva profile at Agua Buena east of the Andes in central Argentina. The main geomorphological units of the area were identified and mapped based on satellite image analysis and multiple field surveys. The sedimentological and pollen results allowed us to reconstruct the development of some environments. The Agua Buena record corresponds to the distal facies of the Arroyo Bayo alluvial fan starting the aggradation process prior to ca. 4100 cal yr BP. The organic-rich levels found were formed during the development of wetlands (vegas) dominated by Cyperaceae, Juncaceae and Poaceae. These highly productive environments with almost permanent water saturation were important between 4100 and 2800 cal yr BP, indicating more stable conditions. After 2800 cal yr BP, the organic content was comparatively lower with increasing sedimentation rates that are indicative of higher fluvial discharges. This information is fundamental to interpret both the pollen and charcoal records of the area and to evaluate their representativeness and potential to reconstruct past local and/or regional vegetation.

  1. Influência dos Íons Mg, Ca, Fe, Cu e Zn sobre a tensão superficial estática de soluções contendo surfatante Influence of Mg, Ca, Fe, Cu and Zn Ions on static surface tension of surfactant solutions

    Directory of Open Access Journals (Sweden)

    F.M.L. Silva

    2006-09-01

    Full Text Available O objetivo do estudo foi avaliar a influência da presença de cinco íons em uma calda de pulverização contendo o surfatante Aterbane. A tensão superficial foi analisada por meio da medição da massa de um conjunto de 25 gotas, com quatro repetições constituindo um tratamento. O trabalho foi dividido em duas etapas. Na primeira, os tratamentos foram combinados em esquema fatorial 9x5x2, sendo nove concentrações do surfatante Aterbane (0,01; 0,025; 0,05; 0,1; 0,2; 0,5; 1; 2; e 3%, cinco íons (Mg++, Ca++, Fe+++, Cu+++ e Zn+++ e duas concentrações desses elementos (10 e 100 ppm. Na segunda etapa, os tratamentos foram combinados em esquema fatorial 5x5x1, utilizandose os mesmos cinco elementos (Mg++, Ca++, Fe+++, Cu+++ e Zn+++, em cinco concentrações (1, 5, 20, 50 e 200 ppm, com apenas uma concentração do surfatante Aterbane (0,025%. Outros nove tratamentos permitiram avaliar as tensões superficiais das concentrações do surfatante (0,01; 0,025; 0,05; 0,1; 0,2; 0,5; 1; 2; e 3% sem a adição dos íons. Os resultados mostraram que houve interferência dos íons sobre as soluções, já que, com exceção do Fe+++ (na concentração de 10 e 100 ppm e do Cu+++ (na concentração de 100 ppm, todos os íons reduziram a tensão mínima alcançada e aumentaram a eficiência do surfatante, implicando benefícios à ação do surfatante e sobre as características de possíveis soluções de aplicação. Todos os íons avaliados promoveram reduções nas tensões superficiais de soluções do surfatante na concentração de 0,025%.The objective of this study was to evaluate the influence of 5 ions on a spray solution containing the surfactant aterbane. Surface tension was analyzed by measuring the mass of a set of 25 drops, with four repetitions constituting a treatment. The work was divided in two stages. In the first, the treatments were arranged in a 9x5x2 factorial design, nine Aterbane concentrations (0.01; 0.025; 0.05; 0.1; 0.2; 0

  2. El empleado público ante el procedimiento administrativo: deberes y obligaciones de buena administración

    OpenAIRE

    Díaz y Díaz, María Cruz

    2011-01-01

    [ES] Esta tesis trata sobre el empleado público ante el procedimiento administrativo, sus deberes y obligaciones de buena administración. [EN] This thesis deals with the public employee to the administrative procedure, duties and obligations of good governance.

  3. Movimientos sociorreligiosos y lucha política: el movimiento de 'La Buena Nueva' y la rebelión del '62 entre los Nivaclé del Chaco boreal paraguayo

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    Ana María Spadaforo

    2003-01-01

    Full Text Available En el presente trabajo se analizan dos movimientos sociales que tuvieron lugar entre los indígenas nivaclé del Chaco paraguayo: El movimiento de La Buena Nueva acaecido durante la década del 50 y la rebelión indígena del 62. Ambos, uno desde lo religioso y el otro desde lo político, fueron respuesta a la situación de marginalidad creciente a la que se vió sometido el indígena.Se cuestionan determinadas posturas ortodoxas que tienden a ver los movimientos de tipo milenarista y de reivindicación étnica como fragmentarios, localistas y destinados al fracaso.

  4. EL BIENESTAR SUBJETIVO ANTE LAS BUENAS PRÁCTICAS EDUCATIVAS CON TIC: SU INFLUENCIA EN PROFESORADO INNOVADOR

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    Jesús Valverde Berrocoso

    2013-01-01

    Full Text Available El objetivo de este estudio, que forma parte de una investigación más amplia sobre la innovación educativa y la integración de las Tecnologías de la Información y la Comunicación (TIC en el aula [1], es conocer el grado de «bienestar subjetivo» autopercibido por profesorado innovador y asociado a su realización de «buenas prácticas educativas con TIC». El bienestar subjetivo es un concepto que se extrae de las percepciones de las personas sobre su existencia o su visión subjetiva de su experiencia vital y profesional. En una muestra de profesorado innovador (N=41 de centros educativos seleccionados por sus «buenas prácticas con TIC», se aplicó un cuestionario para medir qué motivaciones, emociones y competencias están presentes en una práctica innovadora con tecnologías, así como el grado de satisfacción personal y profesional logrado tras la aplicación de estas buenas prácticas. Los resultados revelan las motivaciones que mueven al profesorado a implicarse en actividades docentes innovadoras, las percepciones de satisfacción y las emociones en las que se fundamenta su grado de bienestar subjetivo vinculado con las buenas prácticas educativas con TIC. Las motivaciones que impulsan la innovación o las buenas prácticas educativas con TIC son de carácter práctico (mejora del trabajo docente y mayor interés del alumnado, ético (deber y responsabilidad de uso por parte del profesorado y personal (superación de retos para lograr una mayor competencia digital. El profesorado manifiesta mayoritariamente emociones positivas relacionadas con el uso educativo de las TIC (orgullo, satisfacción, autoestima, autoconfianza y felicidad, autopercepción de logro de metas profesionales y una mayor eficacia en su actividad docente. El profesorado percibe que sus buenas prácticas inciden en la actitud positiva de sus compañeros hacias las innovaciones con TIC, el apoyo del equipo directivo hacia estos proyectos y a una mayor

  5. ITINERARIOS DE LA BUENA ENSEÑANZA A PARTIR DE LOS RELATOS BIOGRÁFICOS DOCENTES

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    Zelmira Álvarez

    2010-01-01

    Full Text Available En la investigación cualitativa en educación, el enfoque biográfico y narrativo ha logrado su identidad propia. Siguiendo esta línea, se indaga aquí, por medio de entrevistas semi-flexibles, en las biografías de una selección de buenos docentes de la Facultad de Humanidades de la Universidad Nacional de Mar del Plata, Argentina. Éstos fueron identificados a través de cuestionarios semi-abiertos administrados a estudiantes avanzados de los Profesorados de esta Facultad. Del análisis de las conversaciones, se han seleccionado seis casos que confieren a sus recorridos de vida públicos y privados la acepción de itinerarios físicos o intelectuales. La interpretación de los datos transforma a estos relatos en historias de vida y sugiere el entretejido de las buenas prácticas con las trayectorias. Se construye así en la educación superior -donde la enseñanza en el aula es privada- un conocimiento local pero colegiado.

  6. Characterization of dispersion, attenuation, and anisotropy at the Buena Vista Hills field, California

    Science.gov (United States)

    Hackert, C.L.; Parra, J.O.; Brown, R.L.; Collier, H.A.

    2001-01-01

    We create a log of intrinsic dispersion and attenuation for the Antelope Shale formation of the Buena Vista Hills field, San Joaquin Valley, California. High dispersion (or low Q) values correlate with thin sand and carbonate beds within the Antelope Shale. These beds are at least ten times as permeable as the host shale formation, so this effect provides a possible avenue for seismic prediction of permeability. The dispersion log is formed through comparison of crosswell seismic velocities (measured at approximately 1 kHz) and sonic log velocities (measured at approximately 10 kHz). In order to provide a proper basis for comparison, the sonic log must first be adjusted for field anisotropy, scaling effects, and resolution of measurement. We estimate a local shale anisotropy of about 20% based on correlations generated from published measurements of other shale fields. We apply resolution enhancement to capture the thin sand and carbonate beds, and windowed Backus averaging to match the measurement scales. A modeling study verifies the technique, and shows that beds of thickness greater than 30 cm have a measurement signature. The actual resolution is on the order of the crosswell Fresnel length, or about 7 m for the model study.

  7. Buenas prácticas educativas en centros escolares ubicados en zonas de riesgo de exclusión social

    OpenAIRE

    Francisco Javier AMORES FERNÁNDEZ; Ritacco Real, Maximiliano

    2011-01-01

    Esta aportación es fruto de nuestra participación como investigadores en un proyecto desarrollado en el marco del Plan Nacional I+D+I 2006-2009 (SEJ 2006-14992-C06-04/EDUC) titulado «Estudiantes en riesgo de exclusión educativa en la ESO: situación, programas y buenas prácticas en la Comunidad Autónoma de Andalucía». Hacer referencia a las buenas prácticas educativas en centros escolares ubicados en zonas de riesgo de exclusión social se asocia a características como la flexibilid...

  8. Buenas prácticas ambientales para el ahorro de energía eléctrica

    OpenAIRE

    Estruch Fuster, Alicia Milagro

    2011-01-01

    La guía presenta consejos útiles para reducir el consumo de energía eléctrica en la Universidad Politécnica de Valencia, aunque muchos de ellos pueden ser aplicables al entorno doméstico. Estruch Fuster, AM. (2011). Buenas prácticas ambientales para el ahorro de energía eléctrica. http://hdl.handle.net/10251/9619.

  9. UNA APROXIMACIÓN AL CONOCIMIENTO DE UNA PROFESORA UNIVERSITARIA, AGENTE DE BUENAS PRÁCTICAS DOCENTES, UTILIZANDO MAPAS CONCEPTUALES

    Directory of Open Access Journals (Sweden)

    Fermín González García

    2010-01-01

    Full Text Available Se muestra en este trabajo un modelo de conocimiento construido sobre buenas prácticas docentes de una profesora universitaria, responsable de la asignatura "Circuitos y Sistemas I", correspondiente al primer curso (y primer cuatrimestre de la titulación de Ingeniería Técnica de Telecomunicación: Sonido e Imagen. El modelo fue realizado en el marco de una investigación que se ha llevado a cabo por 6 universidades españolas. El trabajo identifica, analiza, explicita y representa con la ayuda del programa informático CMap Tools el pensamiento pedagógico y la práctica docente de un profesor universitario caracterizado por su buena práctica, a partir de entrevistas en profundidad. El modelo de conocimiento construido de las buenas prácticas de este profesor, fácilmente accesible a través de Internet, constituye un excelente ejemplo que puede orientar tanto al profesor novel como a profesores experimentados que quieran mejorar la calidad de la docencia que imparten.

  10. Ética de la investigación. Las buenas prácticas

    Directory of Open Access Journals (Sweden)

    López de la Vieja, M.ª Teresa

    2008-04-01

    Full Text Available The Act 14/2007 regulates biomedical research, including research with stem cells and cloning for therapeutic purposes. The Spanish legislation about those controversial topics could also exemplify the changing perspective about ethical codes and ethical committees, because now they are not only centered on rights, and guarantees for the subjects involved in experimentation, but on good practice. Research Ethics has usually been related to norms, and especially to respect for human rights in the biomedical field. From the Nurmberg Code, the Helsinki Declaration, the Oviedo Convention to the Addition Protocol on biomedical research, the perspective of rights prevailed over a wider perspective, which now aims to promote the researchers’ commitment and their responsibilities to health and welfare; the welfare of every subject, humans, and non-humans, and in every context, including the developing countries. The UNESCO Declaration could expand this perspective, including social justice issues in the agenda of research Ethics, usually centered on autonomy, as basic principle, and on the human rights approach. The article would analyze the good practice approach, with guidelines expanding the agenda of research Ethics in order to promote a better governance of scientific practice.La Ley 14/2007 regula la investigación biomédica, incluida la investigación con células troncales y la clonación con fines terapéuticos. La legislación española sobre estos temas tan controvertidos puede ejemplificar también ciertos cambios en el enfoque sobre códigos éticos y comités de Ética; ahora éstos no sólo se centran en los derechos y las garantías para los sujetos participantes en la experimentación, sino también en las buenas prácticas. La Ética de la investigación ha estado casi siempre asociada con las normas y, en especial, con el respeto por los derechos humanos en el ámbito de la Biomedicina. Desde el Código de Nürnberg, la Declaraci

  11. Buenas pr??cticas en el desarrollo de trabajo colaborativo en materias TIC aplicadas a la educaci??n

    OpenAIRE

    Guti??rrez Esteban, Prudencia; R. Yuste Tosina; S. Cubo Delgado; M. Lucero Fustes

    2011-01-01

    Este trabajo presenta cuatro experiencias docentes de Buenas Pr??cticas en el uso de las Tecnolog??as de la Informaci??n y la Comunicaci??n en la Ense??anza Universitaria, en el ??mbito educativo, desarrolladas en materias impartidas durante el curso 2009/2010 en la Facultad de Educaci??n de la Universidad de Extremadura, centradas en el trabajo colaborativo y aut??nomo del alumnado como metodolog??a, la innovaci??n docente como filosof??a, el uso de las TIC aplicadas a...

  12. Buenas prácticas ambientales para la adquisición o alquiler de vehículos

    OpenAIRE

    Bellver Navarro, Carmen Gemma

    2015-01-01

    En la Guía se describen los principales aspectos ambientales derivados del uso y mantenimiento de vehículos a motor, así como los impactos ambientales asociados y se presentan las opciones más respetuosas con el medio ambiente. También se trata el mecanismo de gestión de este tipo de vehículos al final de su vida útil Bellver Navarro, CG. (2015). Buenas prácticas ambientales para la adquisición o alquiler de vehículos. http://hdl.handle.net/10251/58228.

  13. “Buen o buena docente” desde la perspectiva de estudiantes que han egresado de educación secundaria

    Directory of Open Access Journals (Sweden)

    Robert Caballero-Montañez

    2006-09-01

    Full Text Available “Buen o buena docente” es aquella persona que ha marcado e influido de manera trascendental en la vida personal y académica de sus estudiantes y cuya imagen permanece en su memoria escolar como un recuerdo prolongado y altamente positivo. En consecuencia, conocer cuáles son sus rasgos centrales y por qué impactaron de tal manera en sus estudiantes merece ser más investigado como un aporte al campo de estudio sobre la docencia en educación básica. En este marco, el objetivo central de esta investigación empírica ha sido analizar las características del “buen o buena docente” desde la percepción de sujetos egresados de educación secundaria de escuelas públicas y privadas de Lima (Perú. Los resultados de este estudio cualitativo, basado en entrevistas semiestructuradas a ocho estudiantes que han egresado, ha permitido describir, por un lado, los rasgos del buen personal docente en relación a su alumnado, caracterizado por un estilo vinculante expresado en el compromiso con este, en una percepción positiva y actitud motivadora y una calidad afectiva en la interacción profesorado-alumnado; y, por otro lado, rasgos en relación con su profesión como: su pasión por enseñar; su dominio sobre contenidos y la organización de la clase. El estudio concluye que el hecho que todos los egresados y egresadas hayan podido recordar al menos a un profesor o profesora como buen o buena docente revela la heterogeneidad de tipos de docentes que exige superar generalizaciones negativas y que la imagen docente es una construcción colectiva en varias promociones. Una de las implicaciones de este estudio es recuperar la voz de los exalumnos y exalumnas, tanto para el campo de las investigaciones como en el de la política educativa, por contener un valioso potencial para mejorar nuestra comprensión de la experiencia escolar y de la relación docente-estudiantes.

  14. La equidad de género en educación. Análisis y descripción de buenas prácticas educativas

    OpenAIRE

    María Ángeles REBOLLO CATALÁN; Joaquín PIEDRA DE LA CUADRA; Sala, Arianna; Sabuco Canto, Assumpta; Saavedra Macías, Francisco Javier; Bascón Díaz, Miguel Jesús

    2012-01-01

    Este artículo presenta resultados derivados de un proyecto de investigación de excelencia subvencionado por la Junta de Andalucía en convocatoria pública (BOJA 11/04/2007), cuyo propósito ha sido el diagnóstico de la cultura de género en los centros educativos y el estudio de buenas prácticas en esta materia. El propósito de este artículo es describir y analizar una variedad de buenas prácticas coeducativas desarrolladas en diferentes contextos escolares de Andalucía. Además, se p...

  15. Los griegos y la vida buena: un diálogo

    Directory of Open Access Journals (Sweden)

    Thomas Robinson

    2009-12-01

    Full Text Available El articulo se propone examinar la noción del concepto clásico griego de la “vida buena” (eu zen, eudaimonia como el objetivo práctico fundamental de la existencia humana y ofrecer una mirada novedosa a la oposición actual entre teorías teleológicas y no teleológicas sobre este tema, llevando a una re-evaluación de las contribuciones que aporta la filosofía antigua a este asunto. La forma del artículo es original: los autores han creado un diálogo entre dos personajes ficticios, cada uno de los cuales representa un enfoque filosófico distinto. Al hacerlo, quisieron rendir tributo a la obra de Sócrates y Platón, en el campo ético, y al mismo tiempo subrayar la relevancia actual de muchos elementos de esta obra en los estudios contemporáneos de filosofía moral.

  16. POLÍTICAS EDUCATIVAS, BUENAS PRÁCTICAS Y TIC EDUCATIONAL POLICIES AND GOOD PRACTICES WITH ICT IN ANDALUSIA REGION

    Directory of Open Access Journals (Sweden)

    Juan de Pablos Pons

    2010-02-01

    Full Text Available Esta aportación está vinculada a la difusión de los resultados de un proyecto de investigación titulado “Políticas educativas autonómicas y sus efectos sobre la innovación pedagógica en el uso de las TIC en los centros escolares”, que se ha desarrollado en el marco del Plan Nacional de I+D 2004-2007. El trabajo se centra en el análisis del discurso que explicita las políticas educativas en Andalucía, dirigidas a la incorporación de las TIC en el sistema educativo. El estudio realizado permite, por un lado, conocer y detallar los conceptos implícitos en las mismas respecto a “buenas prácticas” con TIC, innovación educativa con TIC, y usos de las TIC, y por otro, determinar los principales  ámbitos de incidencia de la intervención política, así como los programas de incentivación relacionados con la innovación y buenas prácticas con TIC.This contribution is linked to a research project entitled "Education policies and their effects on regional educational innovation in the use of ICT in schools", which has been developed under the National Program Research and Development 2004-2007. The work is focused on discourse analysis about incorporating Andalusian ICT in the educational system. The study allows to understand the concepts involved in the same relation to good practice with ICT education with ICT innovation and ICT use, and to determine the main areas where the political intervention and incentive programs related to innovation and good practice with ICT.

  17. Resignificar la buena enseñanza desde la voz de docentes memorables en educación superior confrontada con Ortega y Gasset y otros académicos

    Directory of Open Access Journals (Sweden)

    Luis Gabriel Porta

    2014-01-01

    Full Text Available La indagación narrativa es un modo de conocimiento y de investigación que permite acceder a los paisajes de conocimiento práctico profesional de los docentes y brinda una puerta de entrada a la privacidad de las aulas. La investigación narrativa ha impactado considerablemente en las maneras en que se estudia y comprende cómo los docentes aprenden su oficio y desarrollan luego su práctica profesional. Esta presentación aspira a examinar algunas categorías derivadas de dos entrevistas en profundidad de carácter biográfico-narrativo realizadas a un docente memorable que se desempeña en la Universidad Nacional de Mar del Plata, Argentina. En el transcurso del estudio se observan y resignifican teóricamente categorías de la buena enseñanza —derivadas de las vivencias del entrevistado— que involucran, entre otros aspectos, al conocimiento personal del docente, su amor por los estudiantes y su tarea, los visos morales de sus prácticas y la concepción de la enseñanza como un juego que merece ser abordado con seriedad.

  18. Pluralismo y éticas de la vida buena. Del Filebo de Platón a la Ética a Nicómaco de Aristóteles

    Directory of Open Access Journals (Sweden)

    Francisco Bravo

    2009-12-01

    Full Text Available En este artículo intento responder a la pregunta de si son –o al menos pueden ser– pluralistas las éticas de la vida buena. Por tales se entienden las éticas teleológicas, centradas en el fin último o bien supremo del individuo humano. ¿Pueden, pese a su aparente individualismo, ser éticas pluralistas? Para responder, me circunscribo al Filebo de Platón, en que el autor, superando las visiones que identifican el bien humano con la vida de placer o con la vida del conocimiento, lo identifica con una vida mixta, que es una mezcla de las dos. Desarrolla, pues, a mi modo de ver, una ética estructuralmente pluralista: (1 por la actitud, eminentemente dialógica, de sus interlocutores; (2 por el método de la división que emplea, el cual va de la pluralidad indefinida a la unidad, y de esta a una pluralidad definida; (3 por el principio ontológico de lo Uno-Múltiple en que se funda; (4 por el contenido que asigna al bien de la existencia humana. Sobre todo por este contenido –esencialmente inclusivo– la ética del Filebo ha ejercido una influencia decisiva en la filosofía moral igualmente pluralista de la Ética a Nicómaco.

  19. Síntese de ferrita NiFe2O4 e sua incorporação em compósitos de poliamida 6: Parte 1: caracterização estrutural por drx e mev dos pós e dos compósitos Synthesis of NiFe2O4 ferrite and its incorporation in nylon 6: Part 1: structural characterization by xrd and sem of ferrite powders and its composites

    Directory of Open Access Journals (Sweden)

    Daniella C. Bezerra

    2010-01-01

    Full Text Available As ferritas geralmente são absorvedoras de radiação eletromagnética e apresentam a versatilidade de poderem ser manufaturadas com geometrias diferentes, e usadas na forma de ferritas policristalinas (corpo sinterizado ou de compósitos de ferrita (adição de pó em matriz apropriada. A poliamida 6, por sua vez, pertence a uma classe de polímeros atraentes para aplicações em engenharia devido à combinação de propriedades como: estabilidade dimensional, boa resistência ao impacto sem entalhe e excelente resistência química. O objetivo deste trabalho foi sintetizar pós de ferrita NiFe2O4, e avaliar a adição destes em concentrações de 10, 30, 50 e 60% em massa a uma matriz polimérica de poliamida 6 usando um misturador da Haake Blücher, para obter compósitos de poliamida 6/NiFe2O4. Os pós e os compósitos foram caracterizados por difração de raios X (DRX e microscopia eletrônica de varredura (MEV. Os difratogramas de raios X mostraram picos característicos da poliamida 6 e da ferrita. Por MEV foi observada a formação de aglomerados grandes para a concentração de 60% e, uma grande quantidade de poros. Para a concentração de 10%, as partículas ficaram mais dispersas, com menos aglomerados e menos poros no compósito.Ferrites normally absorb electromagnetic radiation, being versatile in that they can be manufactured in different geometries and used as polycrystalline ferrites (sintered body or composites of ferrite (with addition of the powder to an appropriate matrix. On the other hand, nylon 6 is an attractive polymer for engineering applications due to the combination of properties such as dimensional stability, good impact strength without notch indentation and excellent chemical resistance. The aim of this paper was to synthesize ferrite (NiFe2O4 powders and to evaluate their addition in concentrations of 10, 30, 50 and 60 wt% into a nylon 6 polymer matrix using a Haake Blücher mixer. The powders and the

  20. Evaluation of Pb and Fe tenors present in the sediments nearby the activities of taking advantage of lead-acid batteries; Avaliacao dos teores de Pb e Fe presentes nos sedimentos proximos as atividades de reaproveitamento de baterias chumbo-acidas

    Energy Technology Data Exchange (ETDEWEB)

    Soares, Fernanda; Andrade, Crescencio; Monteiro, Carlos; Oliveira, Daniela; Valentim, Eliane, E-mail: candrade@cnen.gov.b, E-mail: valentim@cnen.gov.b [Centro Regional de Ciencias Nucleares (CRCN/NE-CNEN/PE), Recife, PE (Brazil)

    2011-07-01

    The region chosen for this study was the Municipality of Belo Jardim, Pernambuco State, Brazil, which is considered an important industrial complex of the production and repairing of lead-acid batteries. Sediment samples were collected near to the illegal smelting industries and analyzed by ionic exchange method using a alpha-beta proportional counter for determining the activity of Pb-210, radionuclide used as geochronological tool. The chemical elements Pb and Fe were determined by means of flame atomic absorption spectrometry. The obtained results indicated an expressive increasing of lead and iron concentrations in the last 20 years. The concentrations in the sampled profile varied from 318 to 15487 mg.kg-1 and from 19 to 1524 mg.kg-1 for Fe and Pb, respectively. (author)

  1. Microstructure of two phases alloy Al{sub 3}Ti/Al{sub 3}Ti{sub 0.75}Fe{sub 0.25}; Microestructura de una aleacion de dos fases Al{sub 3}Ti/Al{sub 3}Ti{sub 0.75}Fe{sub 0.25}

    Energy Technology Data Exchange (ETDEWEB)

    Angeles, C.; Rosas, G.; Perez, R. [Instituto Nacional de Investigaciones Nucleares, Departamento de Sintesis y Caracterizacion de Materiales, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1998-07-01

    The titanium-aluminium system presents three intermetallic compounds from those Al{sub 3}Ti is what less attention has received. The objective of this work is to generate and characterize the microstructure of multiphase alloys nearby to Al{sub 3}Ti compound through Fe addition as alloying. This is because it has been seen that little precipitates of Al{sub 2}Ti phase over Al{sub 3}Ti intermetallic compound increases its ductility. (Author)

  2. Buenas prácticas docentes en la formación del profesorado: Relatos y modelos entramados

    Directory of Open Access Journals (Sweden)

    Zelmira Álvarez

    2011-01-01

    Full Text Available Este trabajo da cuenta de algunos aspectos de la labor cumplida por el Grupo GIEEC, Facultad de Humanidades, Universidad Nacional de Mar del Plata, Argentina. La línea de investigación seguida se describe como naturalista, interpretativa, con una aproximación biográfico-narrativa. Se procede a laidentificación de los buenos docentes mediante un cuestionario a estudiantes avanzados de todos los profesorados de la Facultad, aportando las características de las mejores clases vividas. Los docentes más nombrados como ejemplos de buena enseñanza son entrevistados en profundidad y sus relatos interpretados a la luz de categorías teóricas que nos ayudan a repensar los fundamentos y las prácticas de formación del profesorado. Es nuestra intención presentar aquí el caso de un buen docente del Profesorado de Inglés planteando entrecruzamientos, continuidades y discontinuidades entre las narrativas de los alumnos sobre sus buenos docentes y las de estos últimos sobre sus trayectorias, mentores y alumnos ideales.

  3. Código de buena práctica para el control del dolor oncológico

    Directory of Open Access Journals (Sweden)

    J. R. González-Escalada

    2011-04-01

    Full Text Available En muchas ocasiones, los pacientes con cáncer no expresan su dolor por miedo a que el médico desvíe su atención hacia este síntoma, en lugar de centrarse en el tratamiento de su enfermedad principal. No obstante, el paciente debe saber que el tratamiento de su dolor no solo no interfiere con la terapia curativa, sino que colabora con ella. Entre los enfermos, es habitual el temor a que el avance de la enfermedad les lleve a situaciones de sufrimiento insostenible que supere todas las posibilidades médicas, pero es nuestro deber ayudarles a ser conscientes de que la medicina ofrece un abanico de terapias capaces de aliviar su dolor y evitar su sufrimiento. Este conocimiento es esencial para aumentar su confianza en el tratamiento y mejorar la relación médico-paciente. Frente a este desafío, SECPAL (Sociedad Española de Cuidados Paliativos, SED (Sociedad Española del Dolor, SEOM (Sociedad Española de Oncología Médica y SEOR (Sociedad Española de Oncología Radioterápica unen sus esfuerzos y crean ALIADO (Alianza Contra el Dolor Oncológico, un grupo de trabajo interdisciplinario que nace con el objetivo de concienciar e implicar a todo el colectivo médico en la necesidad de mejorar la calidad de vida del paciente con dolor oncológico. La primera iniciativa de ALIADO en este sentido es la elaboración del Código de buena praxis para el tratamiento del dolor oncológico, que pretende contribuir al avance en el conocimiento y el manejo de estos pacientes.

  4. Horticultura periurbana: Implementación de un programa de “buenas prácticas” en Pilar

    Directory of Open Access Journals (Sweden)

    Luciana Galván

    2010-07-01

    Full Text Available La producción de verduras que se realiza en la periferia exterior del Área Metropolitana de Buenos Aires (AMBA constituye una actividad esencial a la hora de asegurar el abastecimiento alimentario cotidiano de 13 millones de habitantes. El trabajo se propone sistematizar la experiencia de implementación de un programa que se está llevando a cabo actualmente con 74 productores que se localizan en el partido de Pilar, uno de los más afectados por el avance de la urbanización. El mismo, denominado PRO.A.A.S. (Promoción de la Actividad Agropecuaria Sustentable, se ha instituido durante 2007 a través de un convenio formalizado entre la Municipalidad de Pilar y el Instituto Nacional de Tecnología Agropecuaria. Tiene como propósito que los horticultores, en su gran mayoría de origen boliviano, mejoren sus procedimientos a través de “buenas prácticas” tecno-productivas. El trabajo pretende determinar en qué medida este tipo de experiencias interpelan al investigador sobre los modos de la urbanización en una metrópolis como Buenos Aires considerando que el periurbano, un espacio de interfase urbano-rural, constituye un territorio “de borde”, con la carga simbólica y las dificultades de abordaje metodológico que su situación “transicional” trae aparejada.

  5. El Documento de las Américas: Buenas Prácticas Clínicas para Autoridades Reguladoras

    Directory of Open Access Journals (Sweden)

    Ricardo Palacios

    2009-12-01

    Full Text Available En 1996, cuando se adoptaron las Normas de Buenas Prácticas Clínicas de la Conferencia Internacional de Armonización (ICH, por su sigla en inglés, se proyectó facilitar la acción de autoridades reguladoras sobre los diferentes actores de la investigación clínica. Estas normas fueron creadas e incorporadas a la legislación de las tres regiones del mundo (Estados Unidos, Unión Europea y Japón que producen la mayor parte de medicamentos, vacunas, biológicos, pruebas diagnósticas y equipos médicos. Las autoridades reguladoras de las tres regiones mencionadas se caracterizan por tener gran capacidad técnica para la ejecución de su misión de promover el avance tecnológico y proteger a las comunidades. Aún así, asumir esta tarea ha sido un largo camino, en parte porque en las Buenas Prácticas Clínicas de la ICH se definieron las responsabilidades para comités de ética, patrocinadores e investigadores; pero las autoridades reguladoras de las regiones de la ICH no precisaron sus propias responsabilidades, ni indicaron cómo iban a cumplir su función en ese documento y, consecuentemente, no han conseguido armonizar sus prácticas en ese sentido.Justamente, este punto es uno de los grandes avances que ofrece el Documento de las Américas sobre Buenas Prácticas Clínicas: poder ayudar a las autoridades reguladoras del continente a establecer una plataforma común sobre cómo desempeñar su función en relación con la investigación clínica. Las posibilidades que ofrece esta metodología común de regulación para las autoridades de nuestros países, con mayores limitaciones en presupuesto y en recurso humano que sus contrapartes de las regiones de la ICH, son prometedoras en términos de colaboración porque pueden permitir la formación unificada de personal, realización de inspecciones conjuntas y hasta pensar en un futuro de reconocimiento mutuo de las acciones de las autoridades de cada país como ocurrió en Europa hace m

  6. El Documento de las Américas: Buenas Prácticas Clínicas para Autoridades Reguladoras

    Directory of Open Access Journals (Sweden)

    Ricardo Palacios

    2010-08-01

    Full Text Available En 1996, cuando se adoptaron las Normas de Buenas Prácticas Clínicas de la Conferencia Internacional de Armonización (ICH, por su sigla en inglés, se proyectó facilitar la acción de autoridades reguladoras sobre los diferentes actores de la investigación clínica. Estas normas fueron creadas e incorporadas a la legislación de las tres regiones del mundo (Estados Unidos, Unión Europea y Japón que producen la mayor parte de medicamentos, vacunas, biológicos, pruebas diagnósticas y equipos médicos. Las autoridades reguladoras de las tres regiones mencionadas se caracterizan por tener gran capacidad técnica para la ejecución de su misión de promover el avance tecnológico y proteger a las comunidades. Aún así, asumir esta tarea ha sido un largo camino, en parte porque en las Buenas Prácticas Clínicas de la ICH se definieron las responsabilidades para comités de ética, patrocinadores e investigadores; pero las autoridades reguladoras de las regiones de la ICH no precisaron sus propias responsabilidades, ni indicaron cómo iban a cumplir su función en ese documento y, consecuentemente, no han conseguido armonizar sus prácticas en ese sentido. Justamente, este punto es uno de los grandes avances que ofrece el Documento de las Américas sobre Buenas Prácticas Clínicas: poder ayudar a las autoridades reguladoras del continente a establecer una plataforma común sobre cómo desempeñar su función en relación con la investigación clínica. Las posibilidades que ofrece esta metodología común de regulación para las autoridades de nuestros países, con mayores limitaciones en presupuesto y en recurso humano que sus contrapartes de las regiones de la ICH, son prometedoras en términos de colaboración porque pueden permitir la formación unificada de personal, realización de inspecciones conjuntas y hasta pensar en un futuro de reconocimiento mutuo de las acciones de las autoridades de cada país como ocurrió en Europa hace m

  7. Dos cupas complutenses

    Directory of Open Access Journals (Sweden)

    Stylow, Armin U.

    2006-12-01

    Full Text Available Publication of two cupae from the ancient territory of Complutum. One was found in excavations in Alcalá de Henares (Madrid and is unpublished; of the other one, which came to light in the church of Alovera (Guadalajara, a new reading is given.Se publican dos cupas del antiguo territorio de Complutum, una, inédita, encontrada en excavación en Alcalá de Henares (Madrid, y la segunda, procedente de la iglesia de Alovera (Guadalajara, con una nueva lectura.

  8. Los deberes derivados de la buena fe como límite al poder de dirección del cabeza de red

    OpenAIRE

    Gómez Asensio, Carlos

    2013-01-01

    Las redes empresariales constituyen una forma de organización empresarial conocida y estudiada desde el ámbito de la economía, las ciencias de la organización empresarial y el management. Sin embargo, esta forma de organización empresarial no ha despertado el interés de los juristas hasta hace relativamente poco tiempo. La causa de este fenómeno es debido a que, en un principio, los operadores económicos que comenzaron a estructurar su actividad en forma de red empresarial, lo hicieron emp...

  9. dos estudios de caso

    Directory of Open Access Journals (Sweden)

    Daniel Kersffeld

    2013-01-01

    Full Text Available La UNASUR se ha destacado desde sus inicios en la compleja labor de mediación y resolución de conflictos internacionales. Para ello, esta entidad multilateral ha apelado a distintas fórmulas políticas tendientes al encausamiento de problemáticas y conflictos apartados del camino de la institucionalidad y de los medios tradicionales de resolución. Con todo, y pese a la búsqueda de caminos alternativos, han sido las cumbres presidenciales la principal herramienta destinada a encontrar soluciones innovadoras y respetuosas del orden democrático y constitucional de los países sudamericanos. En este artículo se analiza de manera específica la actuación de la unasur en dos casos de profunda gravedad institucional: el intento de golpe de Estado ocurrido en Ecuador el 30 de septiembre de 2010 y el derrocamiento del ex presidente Fernando Lugo en Paraguay en junio de 2012. Luego de analizar estos dos casos extremos, y las implicancias políticas generadas, se avanza en una visión comprensiva acerca del éxito o el fracaso del papel político de la unasur como instancia de resolución de conflictos a nivel internacional.

  10. Spatial-Temporal Distribution of Hantavirus Rodent-Borne Infection by Oligoryzomys fulvescens in the Agua Buena Region - Panama

    Science.gov (United States)

    Gonzalez, Publio; Cumbrera, Alberto; Rivero, Alina; Avila, Mario; Armién, Aníbal G.; Koster, Frederick; Glass, Gregory

    2016-01-01

    Background Hotspot detection and characterization has played an increasing role in understanding the maintenance and transmission of zoonotic pathogens. Identifying the specific environmental factors (or their correlates) that influence reservoir host abundance help increase understanding of how pathogens are maintained in natural systems and are crucial to identifying disease risk. However, most recent studies are performed at macro-scale and describe broad temporal patterns of population abundances. Few have been conducted at a microscale over short time periods that better capture the dynamical patterns of key populations. These finer resolution studies may better define the likelihood of local pathogen persistence. This study characterizes the landscape distribution and spatio-temporal dynamics of Oligoryzomys fulvescens (O. fulvescens), an important mammalian reservoir in Central America. Methods Information collected in a longitudinal study of rodent populations in the community of Agua Buena in Tonosí, Panama, between April 2006 and December 2009 was analyzed using non-spatial analyses (box plots) and explicit spatial statistical tests (correlograms, SADIE and LISA). A 90 node grid was built (raster format) to design a base map. The area between the nodes was 0.09 km2 and the total study area was 6.43 km2 (2.39 x 2.69 km). The temporal assessment dataset was divided into four periods for each year studied: the dry season, rainy season, and two months-long transitions between seasons (the months of April and December). Results There were heterogeneous patterns in the population densities and degrees of dispersion of O. fulvescens that varied across seasons and among years. The species typically was locally absent during the late transitional months of the season, and re-established locally in subsequent years. These populations re-occurred in the same area during the first three years but subsequently re-established further south in the final year of the

  11. BUENAS PRÁCTICAS TIC. LA ALFABETIZACIÓN DIGITAL EN MAYORES GOOD PRACTICE TIC. DIGITAL LITERACY IN OLDER

    Directory of Open Access Journals (Sweden)

    Félix Huelves Martín

    2010-12-01

    Full Text Available Los equipos informáticos y sus periféricos están diseñados para el uso de un único usuario, constan de un único teclado, ratón; y de una única pantalla. De modo que en una clase de iniciación a la informática, la mejor opción parece ser un equipo por persona. Así, aparentemente, al interactuar individualmente se avanzará más. ¿Pero, y si no es posible contar con suficientes medios? ¿Es realmente imprescindible el “monopuesto” para lograr un aprendizaje significativo? Gracias a la experiencia durante varios cursos de alfabetización digital con adultos utilizando una metodología afín a los objetivos expondremos una buena práctica formativa, haciendo frente a factores adversos como la escasez de recursos. Sin lugar a dudas, sin descuidar la psicología del adulto, educando la adquisición de capacidades tecnológicas haciendo a la persona autónoma en su aprendizaje.Computer equipment and their peripherals are designed for use by a single user, there is only one keyboard, only one mouse, and of course, a single screen. Therefore in the moment to provide a literacy class, the best option seems to be one computer per person. So each student seemed to learn more, have greater interaction with media, and therefore more learning time. But, Is it possible to have the number of computer needed for each student, always? Is it really essential the Single Computers in classroom for effective learning? Thanks to the experience in lot of adults´ literacy courses, using a methodology consistent with the goal of learning, we show a good formative experience, which although obvious, it allows us to realize factors such as the shortage of technological resources, adult psychology and the need to educate not only new technological capabilities but also to transmit values essential to ease management in the knowledge society.

  12. Actitudes docentes y buenas prácticas con TIC del profesorado de Educación Permanente de Adultos en Andalucía

    OpenAIRE

    Fernández Batanero, José María; Torres González, José Antonio

    2015-01-01

    El presente artículo recoge los resultados de un estudio cuyo objetivo ha sido determinar las actitudes del profesorado de educación permanente de adultos de la comunidad autónoma de Andalucía, hacia el uso e integración de las Tecnologías de la Información y Comunicación (TIC) en sus respectivos centros, al mismo tiempo que identificar aquellos factores que favorecen el desarrollo de buenas prácticas. El diseño de investigación es de tipo descriptivo mixto. Las técnicas utiliz...

  13. Análisis de impacto y desarrollo de buenas práctica de auditoría en bases de datos Oracle 11G

    OpenAIRE

    Delgado Picazo, Mario

    2009-01-01

    Este proyecto consiste en realizar un análisis y un estudio de los diferentes tipos de auditoría en Oracle 11g, con el objetivo de estudiar las características de las herramientas disponibles, así como su viabilidad. Mediante experimentación, se estudiará el comportamiento y el rendimiento de las diferentes modalidades de auditoría que Oracle 11g ofrece como motor de la base de datos, obteniendo resultados y comparativas que se utilizarán para preparar un manual de buenas prácticas acerca de ...

  14. Identificación de factores críticos para implantar buenas prácticas agrícolas

    OpenAIRE

    Gutiérrez Guzmán, Nelson; Serra Belenguer, Juan Antonio; Clemente Marín, Gonzalo

    2010-01-01

    En este artículo se presenta la identificación de los factores críticos (FC) que afectan la implantación de un programa de buenas prácticas agrícolas (BPA) en productores de café y frutas del departamento del Huila, en Colombia, mediante la realización de un análisis factorial exploratorio utilizando como método de factorización el análisis de componentes principales (ACP); las ma- trices de datos se construyeron con los resultados de la aplicación de sendos instrumentos con estructura defi...

  15. Palavras dos editores

    Directory of Open Access Journals (Sweden)

    Nelkis de la Orden Medina

    2005-12-01

    Full Text Available Este número da revista RESI está sendo editado em conjunto por mim e pelo novo editor Jorge Muniz Barreto. A revista tem agora nova sede, o Departamento de Informática e de Estatística da Universidade Federal de Santa Catarina. No que a me diz respeito, tenho a satisfação após estes 4 anos de trabalho de ter contribuído no lançamento e consolidação da revista, a qual considero uma ferramenta útil no âmbito universitário. Agradeço a todos os que fizeram possível a realização deste projeto: aos membros do conselho editorial, ao corpo de avaliadores e principalmente aos autores de trabalhos publicados. Gostaria de agradecer ao novo editor sua excelente disposição para aceitar este desafio e lhe desejo uma gestão editorial de muito sucesso. Tenho a certeza que estamos iniciando uma nova etapa da revista que permitirá um crescimento maior da mesma, na qual continuaremos a colaborar de forma permanente. Campo Largo, dezembro de 2005. Nelkis de la Orden Medina, Editora-Chefe. Repletos de idealismo iniciamos com a edição 6 da Revista Eletrônica de Sistemas de Informação nossa atuação como Editor-Chefe. Esperamos honrar os sucessos obtidos pela revista nos cinco números anteriores, e tornar RESI, cada vez mais útil a seus leitores. Para isto temos planos e contamos além do Conselho Editorial e Revisores, ouvir também a opinião dos leitores de modo informal. Para isto criamos um MSN-Space onde os leitores poderão colocar suas sugestões (operacional e conhecer alguns membros tanto do conselho como revisores. Para vê-lo acessem:http://spaces.msn.com/members/resireveletron Os trabalhos apresentados dão continuidade ao estilo das edições anteriores. São seis artigos, abordando assuntos relacionados à Sistemas de Informação. Estes artigos enriquecem o acervo de trabalhos publicados na revista RESI e mostram o panorama das pesquisas que estão sendo desenvolvidas no Brasil e países amigos. Dentre os planos para o ano

  16. Dos chalets, en Suecia

    Directory of Open Access Journals (Sweden)

    Erskine, Ralph

    1968-04-01

    Full Text Available Villa Engström, at Sorunda This house, of semi-spheric shape, has besically only one floor level, without basement. However, the guest room and the attic are a kind of second floor within the cupula. This is an experiment, with a view to the possible mass construction of this prototype. The various rooms are grouped in two blocks, one comprising the bedrooms, which are cellular type and of minimum size, and the bathrooms; the other includes the children's room, a living room which extends into the vestibule, and guest room at a higher level. Villa Ström, near Stockholm This house is practically cube shaped, with ample terraces, which are structurally independent of the central volume. A principal aim has been to obtain fine views in all directions, and also to take advantage of the ground slope. This house, of original and competent design, includes indoor gardens which add colour and life to the rooms.Villa Engström, en Sorunda Esta vivienda, que presenta una «forma» semiesferica, es fundamentalmente un edificio de una sola planta, sin sótano; sin embargo, el cuarto de huéspedes y el «ático» forman como una especie de doble planta dentro de la cúpula. Se trata de una experiencia con vistas a una posible fabricación en serie. Las diferentes habitaciones se hallan agrupadas en dos bloques: uno de ellos ocupado por los dormitorios —que son de tipo celular y de tamaño mínimo—, y los cuartos de baño; y el otro que comprende un cuarto para los niños, la sala de estar —unida con el vestíbulo—, y la habitación de los huéspedes en la parte superior. Villa Ström, cerca de Estocolmo La casa es prácticamente un cubo, con terrazas amplias e independientes estructuralmente del volumen principal. En todo caso, ha dominado la doble preocupación de conseguir magníficas vistas hacia todos los alrededores y una adaptación total a la pendiente del terreno. La vivienda se ha resuelto con maestría y originalidad, procurando zonas

  17. Phonon density of states in epitaxial Fe/Cr(001) superlattices

    Energy Technology Data Exchange (ETDEWEB)

    Ruckert, T.; Keune, W.; Sturhahn, W.; Hu, M. Y.; Sutter, J. P.; Toellner, T. S.; Alp, E. E.

    1999-10-21

    Incoherent nuclear resonant absorption of synchrotron radiation at the 14.413 keV nuclear resonance of {sup 57}Fe was employed to measure directly the Fe-projected (partial) photon density of states (DOS) in epitaxial [Fe(8.7ML)/Cr(8ML)]{sub 200} superlattices and alloy films MBE-grown on MgO(001). Isotopically depleted {sup 56}Fe was used which gives no resonance signal. 0.7 monolayers (ML) thick {sup 57}Fe-probe layer (1{angstrom}) of 95.5% enrichment were placed either at the {sup 56}Fe-on-Cr interfaces or at the center of the {sup 56}Fe layers, thus providing a nuclear resonance signal from different places in the films. In addition, the authors prepared an epitaxial film which contains only a 1{angstrom}-thick {sup 57}Fe submonolayer in Cr(001) and no {sup 56}Fe layers. Moreover, they prepared a 7000 {angstrom}-thick epitaxial {sup 57}Fe{sub 0.03}Cr{sub 0.97}(001) alloy film. The measurements were performed at 300 K with 2.3 meV energy resolution around 14.413 keV. The phonon DOS of the center site was found to be very similar to that of bulk bcc Fe. Compared to the center site, the DOS of the other samples show distinct differences. In particular, longitudinal vibrations of Fe atoms are suppressed at the Fe/Cr interfaces.

  18. NGC 2287: Un cúmulo abierto rico en binarias espectroscópicas de dos espectros

    Science.gov (United States)

    Levato, H.; Malaroda, S.; García, B.; Grosso, M.

    NGC 2287 contiene 100 estrellas con buena fotometría y 40 con tipos MK. En 1979 Levato et al., usando la técnica de la clasificación espectral, descubrieron que la mayoría de las estrellas en el rango B8-A0 eran binarias espectroscópicas con una inusual proporción de binarias con dos espectros. El presente proyecto tuvo el propósito de confirmar la naturaleza binaria de los miembros del cúmulo. Hemos obtenido espectros con resolución 14000 de 15 estrellas clasificadas como binarias. Los espectros, que abarcan la región λ 3500-λ 6000 Å, permitieron confirmar la naturaleza binaria de varias de las estrellas en la muestra. Hacemos notar el considerable interés astrofísico de este cúmulo abierto.

  19. Diseño construcción de espectrofotómetro de doble haz y dos longitudes de onda para análisis de transporte de electrones entre membranas

    OpenAIRE

    Solano González, Sigifredo; Vargas Quiroz, Gonzalo

    2005-01-01

    Resumen: existe en nuestro medio, en diversas áreas de investigación, desarrollo y de enseñanza en la Universidad, la necesidad de un equipo de espectrometría de doble haz y doble longitud de onda de buena resolución, para realizar mediciones titiles en investigaciones biofísicas, biológicas y de desarrollos en áreas eco-bio-agropecuarias. Esta clase de equipo permite realizar mediciones de concentraciones muy bajas de dos sustancias simultáneamente, las cuales tienen diferente longitud de on...

  20. EL VALOR AÑADIDO DE LAS BUENAS PRÁCTICAS CON TIC EN LOS CENTROS EDUCATIVOS VALUE-ADDED OF GOOD PRACTICES WITH ICT IN SCHOOLS

    Directory of Open Access Journals (Sweden)

    Teresa González Ramírez

    2010-02-01

    Full Text Available Este artículo aporta un marco teórico-metodológico en el que situar el impacto o valor añadido de las Buenas Prácticas con TIC en los centros educativos. Para ello, parte de una descripción de las políticas de integración de las Tecnologías de la Comunicación y la Información (TIC en nuestro país y más específicamente en la comunidad autónoma andaluza. Con posterioridad se presentan los principales enfoques metodológicos que orientan actualmente la evaluación de políticas educativas y por extensión las políticas de integración TIC. El análisis de las políticas se concreta en el concepto de Buenas Prácticas como una manera de evaluar las políticas de integración de las TIC en los centros enmarcado en el enfoque de efectividad de las escuelas y más específicamente dentro de los modelos de valor añadido en educación. Finalmente señalamos la orientación metodológica que adquiere en nuestro trabajo el concepto de valor añadido, aportando una relación de indicadores que pueden servir para la evaluación de las políticas TIC asentada en la evaluación de centros y en el desarrollo de prácticas docentes. This article provides a theoretical and methodological framework in which to place the impact or Value Added of the Best Practices with ICT in schools. To do so, starting from a description of policies of integration of IT and Communication Technologies (ICTs in our country, and more specifically in the autonomous Andalusian community. Following are the main methodological approaches that guide the assessment of current education policies and, by extension, the integration of ICT policies. Policy analysis reflected in the concept of Good Practices as a way to evaluate the policies of integration of ICT in schools within the scope of effectiveness of schools and more specifically within the value-added models in education. Finally, we note that the methodological guidance in our work takes on the concept of added

  1. Sobre a psicopatologia dos atos

    Directory of Open Access Journals (Sweden)

    Roberto Calazans

    2015-07-01

    Full Text Available Este artigo pretende apresentar a psicopatologia dos atos a partir do esquema de Jacques Lacan sobre a angústia. Diferenciamos os acting-out, a passagem ao ato, os sintomas, as inibições e a angústia fazendo uma duplicação do esquema de Lacan levando em consideração os registros do simbólico, do real e do imaginário. Esse esquema permite uma abordagem da questão dos atos do sujeito sem cair em uma perplexidade do clínico, nem na confusão entre os atos e a ação. Permite também uma melhor orientação do clínico em relação às diversas modalidades de respostas subjetivas que não se restringem à questão sintomática, que é o campo inaugural da clínica psicanalítica desde a sua fundação por Sigmund Freud. Acreditamos contribuir, assim, para um maior esclarecimento desse esquema no ensino de Lacan e para que ele possa servir de orientação para o tratamento dos atos do sujeito na clínica.

  2. Health assessment for Garden State Cleaners Company, Buena Borough, Atlantic City, New Jersey, Region 2. CERCLIS No. NJD053280160. Final report

    Energy Technology Data Exchange (ETDEWEB)

    1990-09-28

    The Garden State Cleaners Company is a dry cleaning establishment located in Buena Borough, New Jersey. Contaminated wastewater from on-site operations was routinely discharged to on-site soils. Analytical data has described significant soil and ground-water contamination from tetrachloroethylene (PCE) and other volatile organic compounds. Ground-water contamination downgradient (to the south) of the site has required the recommended closing of private wells and the installation of a municipal water supply system. An Administrative Order and Notice of Civil Administrative Penalty Assessment (AO and PSO) were issued to Garden State Cleaners in December 1985, requiring GSC to perform a full RI/FS. Municipal water supplies have been made available to affected residens, but utilization is elective. The site was included on the NPL list in March 1989 and is currently ranked 105 of 108 sites in New Jersey. ATSDR and NJDOH consider the Garden State Cleaners site to be of public health concern. The site is being considered for follow-up health study or evaluation.

  3. La importancia de tener buena salud en la autovaloración de la calidad de vida. El ejemplo de los alumnos mayores de las Islas Baleares

    Directory of Open Access Journals (Sweden)

    Liberto Macías González

    2014-08-01

    Full Text Available El presente trabajo se enmarca dentro de un estudio más amplio sobre la calidad de vida de personas mayores que están participando en un programa universitario para mayores. La parte que presentamos pertenece a una primera fase, centrada en la valoración de la calidad de vida de personas que se han matriculado en el primer curso del Diploma Sènior(que consta de tres cursos en total de la Universitat Oberta per a Majors (UOM, programa educativo ofertado por la Universitat de les Illes Balears (UIB a personas mayores de 50 años. En este trabajo se reflejan los resultados de la percepción subjetiva de la calidad de vida de las personas mayores matriculadas en el primer curso, en tres años académicos distintos y correlativos (2009-10, 2010-11 y 2011-12 del mencionado programa universitario para mayores, con el objetivo de conocer y valorar cual es el componente, relacionado con la calidad de vida, al que le dan más importancia o consideran prioritario para su calidad de vida. Los resultados muestran que una amplia mayoría, el 93%, considera que el componente más importante en su calidad de vida es “tener buena salud”, así como sólo un 0,8% del total de la muestra participante percibe su calidad de vida como baja

  4. La Iglesia Católica de Chile y el proyecto de la Buena Prensa: La experiencia en la Arquidiócesis de Santiago, 1906-1936

    Directory of Open Access Journals (Sweden)

    Manuel Loyola

    2014-06-01

    Full Text Available Inserto en el campo de historia comunicacional, el presente artículo se interroga por las condiciones y características que asumió en Chile la iniciativa internacional de la Buena Prensa (BP, impulsada por el Vaticano desde finales del siglo XIX hasta mediados del XX. En el mismo se sostienen las hipótesis de que la BP constituyó una acción de modernización de la comunicación católica mundial, así como una adecuada estrategia de participación en el naciente campo comunicacional donde comenzaron a tener lugar las disputas por la influencia y control de la opinión pública letrada y no letrada a inicios del siglo XX en Chile. Finalmente, este es la parte inicial de una serie de tres trabajos sobre la BP chilena, donde desarrollaremos diversos aspectos empíricos de su puesta en marcha.

  5. La salud y la vida buena: aportes del enfoque de las capacidades de Amartya Sen para el razonamiento ético en salud pública

    Directory of Open Access Journals (Sweden)

    Diego Alveiro Restrepo-Ochoa

    2013-12-01

    Full Text Available El objetivo del presente trabajo es analizar el aporte del enfoque de las capacidades de Amartya Sen para el razonamiento ético en salud pública. A partir de las críticas del enfoque de las capacidades al utilitarismo, se propone una concepción de salud sustentada en cuatro características: una noción de vida buena de carácter pluralista, la expansión de la libertad como fundamento ético de las acciones en salud, la concepción de la persona como agente y el reconocimiento de la visión interna de la salud, basada en una objetividad posicional. El aporte del enfoque de las capacidades para el razonamiento ético en salud pública puede resumirse en el reconocimiento de cuatro aspectos: la insuficiencia de la asistencia sanitaria como criterio de la ventaja individual, la equidad en salud como un aspecto fundamental de la justicia social, la relevancia de la visión que tienen las personas con relación a su propia salud y el desarrollo de las capacidades como finalidad de las políticas públicas en el campo de la salud pública.

  6. Buenas prácticas en el desarrollo de trabajo colaborativo en materias TIC aplicadas a la educación

    Directory of Open Access Journals (Sweden)

    Prudencia Gutiérrez Esteban

    2011-01-01

    del alumnado como metodología, la innovación docente como filosofía, el uso de las TIC aplicadas a la Enseñanza y el Aprendizaje y el empleo de estas herramientas para el desarrollo de la competencia digital en el alumnado universitario. Tras las experiencias desarrolladas, se realiza un análisis de las mismas en torno a la organización y gestión de espacios virtuales, los indicadores del proceso E-A y las infraestructuras TIC, a partir de las valoraciones realizadas por alumnado y profesorado sobre las dificultades y fortalezas encontradas en el desarrollo de las actividades y el uso de estas herramientas. Lo más destacable de este trabajo, no es sólo la opinión de las y los participantes sobre las experiencias, sino las propuestas realizadas por la osibilidad que nos ofrecen las herramientas colaborativas para el desarrollo de buenas prácticas usando las TIC en la educación superior, con la finalidad de mejorarla.

  7. 57Fe Mössbauer spectroscopy and magnetic study of Al13Fe4

    International Nuclear Information System (INIS)

    Highlights: • We show that Mössbauer spectra of Al13Fe4 can be fitted well with three quadrupole doublets. • The shape of the in-field Mössbauer spectrum is well accounted for with five component subspectra. • The electronic density of states has a pseudogap around the Fermi energy. • We find that the Debye temperature of the compound studied is 383(3) K. - Abstract: The results of ab initio electronic structure and electric field gradient (EFG) calculations, and of X-ray diffraction, 57Fe Mössbauer spectroscopy, and magnetic studies of Al13Fe4 are reported. It is shown that Al13Fe4 crystallizes in the monoclinic space group C2/m, in which Fe atoms are located at five inequivalent crystallographic sites, with the lattice parameters a=15.503(2) Å, b=8.063(2) Å, c=12.464(2) Å, and β=107.71(2)°. We demonstrate that zero-field Mössbauer spectra can be decomposed into three quadrupole doublets. With the aid of the calculated EFG parameters we show that the first doublet results from one Fe site, the second doublet is due to two other Fe sites, and the third doublet originates from the last two Fe sites. We find that the shape of the Mössbauer spectrum of Al13Fe4 measured in an external magnetic field of 90 kOe can be accounted for with five component subspectra generated using the calculated EFG parameters at five inequivalent Fe sites. The quadrupole splittings corresponding to three component doublets are shown to increase with decreasing temperature and are well described by a T3/2 power-law relation. The Debye temperature of Al13Fe4 is found to be 383(3) K. We find a pseudogap in the density of states (DOS), with a width of ∼0.2 eV, that is centered 0.1 eV above the Fermi energy. The finite DOS at the Fermi energy confirms good metallicity of Al13Fe4. The 1/T-like dependence of the magnetic susceptibility shows that Al13Fe4 is a paramagnet

  8. Guías de buena práctica; evaluación y gestión contra la contaminación acústica.; 10 Nivel acústico de evaluación (NAE)

    OpenAIRE

    Hernández-Molina, Ricardo; Cueto-Ancela, José Luis

    2007-01-01

    Guías de buena práctica; evaluación y gestión contra la contaminación acústica. Consejería de Medioambiente: Servicio de Calidad Ambiental; Laboratorio de Ingeniería Acústica; José Luís Cueto, Silvia Rivas y Ricardo Hernández; 2007/2009

  9. Implementación de buenas prácticas de promoción de personal y su relación con la cultura y el compromiso con la organización

    Directory of Open Access Journals (Sweden)

    Merlin Patricia Grueso Hinestroza

    2010-04-01

    Full Text Available La investigación genera hipótesis y prueba un modelo de relaciones entre los valores de la cultura organizacional, la implementación de una buena práctica de promoción de personal desde la perspectiva de género y el compromiso con la organización. Para la prueba de hipótesis se emplea un modelo de ecuaciones estructurales y se realiza una encuesta a 425 empleados. Los resultados llevan a concluir que los valores distancia al poder y orientación de largo plazo predicen la implementación de buenas prácticas de promoción de personal; los componentes del compromiso con la organización no evidenciaron asociaciones significativas con la implementación de una buena práctica de promoción de personal. El estudio contribuye al desarrollo de un cuerpo de investigación en torno a las implicaciones de la perspectiva de género en las organizaciones.

  10. Synthesis and characterization particles of Ba{sub 0,50}Sr{sub 0,50}Co{sub 0,80}Fe{sub 0,20}O{sub 3} obtained by the citrate-EDTA technique; Sintese e caracterizacao de particulados de Ba{sub 0,50}Sr{sub 0,50}Co{sub 0,80}Fe{sub 0,20}O{sub 3} obtidos pela tecnica dos citratos-EDTA

    Energy Technology Data Exchange (ETDEWEB)

    Bonturim, E.; Vargas, R.A.; Andreoli, M.; Seo, E.S.M., E-mail: ebonturim@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (CCTM/IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Centro de Ciencia e Tecnologia de Materiais

    2010-07-01

    The Ba{sub (1-x)}Sr{sub (x)}Co{sub (1-y)}Fe{sub (y)}O{sub (3)} (BSCF) has been studied as a cathode material for Intermediate Temperature Solid Oxide Fuel Cell, due to its better ion and electron conduction. This work aims to study the synthesis of the compound obtained from the citrate-EDTA technique. Thermogravimetric analysis indicated the formation of the compound above 800 deg C. The materials calcined at temperatures of 700, 800 and 900 deg C for 5 h showed cubic pseudo-perovskite structure, according to the literature. By analysis of X-ray fluorescence were obtained powders with nominal chemical composition in the temperature range studied. The micrographs obtained by SEM and particle size distribution analysis showed the formation of particle with diameters below 1 micron. (author)

  11. BUENAS PRÁCTICAS PARA LA SELECCIÓN DE RECURSOS EDUCATIVOS ABIERTOS: EXPERIENCIAS DEL MOOC INNOVACIÓN EDUCATIVA CON REA

    Directory of Open Access Journals (Sweden)

    Mildred Acuña Sossa

    2016-01-01

    Full Text Available El artículo expone la indagación acerca de los Recursos Educativos Abiertos (REA con la colaboración interuniversitaria entre el Instituto Tecnológico de Estudios Superiores de Monterrey, México, y la Universidad Estatal a Distancia de Costa Rica. Esta temática ha sido poco estudiada y ambas universidades se vieron en la necesidad de conocer cómo se realiza la selección de estos recursos. Asimismo, expresa las buenas prácticas de selección de REA utilizadas por los participantes en el curso Innovación Educativa con Recursos Abiertos que se facilitó mediante el formato Massive Open Online Course (MOOC por sus siglas en inglés y así, formular recomendaciones que orienten su elección. Con una investigación exploratoria de tipo cualitativo se realizó una revisión de instrumentos de autoevaluación completados por los participantes, se generaron categorías para describir los aportes publicados en los foros del curso y las tareas que completaron los participantes con respecto al tema de REA. Se concluyó que lo habitual es hacer una valoración directa del recurso antes de usarlo o consultar con colegas o expertos en la materia para hacer una selección adecuada y útil para la práctica educativa. También se destacó que la búsqueda de estos recursos se realiza con la ayuda del navegador web Google, en las revistas digitales y las bases de datos institucionales. Además, se resalta la necesidad de un mejor manejo de los REA por parte de los participantes del curso, y de generar más habilidades para su búsqueda y selección.

  12. Buenas prácticas para la selección de recursos educativos abiertos: experiencias del MOOC innovación educativa con REA

    Directory of Open Access Journals (Sweden)

    Acuña Sossa, Mildred

    2016-05-01

    Full Text Available El artículo expone la indagación acerca de los Recursos Educativos Abiertos (REA con la colaboración interuniversitaria entre el Instituto Tecnológico de Estudios Superiores de Monterrey, México, y la Universidad Estatal a Distancia de Costa Rica. Esta temática ha sido poco estudiada y ambas universidades se vieron en la necesidad de conocer cómo se realiza la selección de estos recursos. Asimismo, expresa las buenas prácticas de selección de REA utilizadas por los participantes en el curso Innovación Educativa con Recursos Abiertos que se facilitó mediante el formato Massive Open Online Course (MOOC por sus siglas en inglés y así, formular recomendaciones que orienten su elección. Con una investigación exploratoria de tipo cualitativo se realizó una revisión de instrumentos de autoevaluación completados por los participantes, se generaron categorías para describir los aportes publicados en los foros del curso y las tareas que completaron los participantes con respecto al tema de REA. Se concluyó que lo habitual es hacer una valoración directa del recurso antes de usarlo o consultar con colegas o expertos en la materia para hacer una selección adecuada y útil para la práctica educativa. También se destacó que la búsqueda de estos recursos se realiza con la ayuda del navegador web Google, en las revistas digitales y las bases de datos institucionales. Además, se resalta la necesidad de un mejor manejo de los REA por parte de los participantes del curso, y de generar más habilidades para su búsqueda y selección.

  13. Remessas de recursos dos imigrantes

    Directory of Open Access Journals (Sweden)

    Ana Cristina Braga Martes

    2006-08-01

    Full Text Available AS REMESSAS contribuem para o desenvolvimento local e para redução da pobreza? Essa é a pergunta-chave que os estudos recentes sobre migrações internacionais têm levantado. O que se está procurando compreender é de que modo as remessas poderiam afetar positiva ou negativamente a economia dos países de origem dos imigrantes. Discutir o papel e o significado das remessas implica, assim, uma discussão em torno da existência (ou não de um "campo de positividades" do fenômeno migratório internacional. O principal objetivo deste artigo é contribuir para essa discussão por meio de um estudo empírico do caso brasileiro que adota as remessas como foco. Para tanto, é identificado o perfil das remessas e dos remetentes, assim como os objetivos e os beneficiários do dinheiro enviado. A pesquisa usa uma abordagem baseada em entrevistas em profundidade e survey não-representativo (Boston e Governador Valadares.DO REMITTANCES contribute to local development and the reduction of poverty? What are the consequences of the dollars sent by the migrants to the people, families, and organizations that receive them in the cities of origin? These are the key questions that recent studies have raised. According to some authors "migration is inevitable and has the potential to be quite positive in terms of development and reduction of poverty. The policies that have their origins in this principle will be more successful than those that attempt to oppose, intransigently, both globalization and the migration of people in space". Do current international migrations produce positive local development effects? The main objective of this article is to contribute to this discussion through an empirical study of the Brazilian case, which takes remittances as its focus. Thus, we identify who the immigrants are who send remittances from the United States to Brazil, to what ends the remittances are directed, who the beneficiaries are, and how the remittances

  14. perspectiva dos Enfermeiros de Psiquiatria

    OpenAIRE

    Silva, Marcelo Filipe Alves da

    2013-01-01

    Tem-se verificado, nas últimas décadas, um aumento da tentativa de suicido ao nível da população mundial, com números preocupantes no que concerne à prática ou tentativa de colocar um fim à própria vida. A enfermagem na área da Psiquiatria, num contexto multidisciplinar, quer ao nível clínico, quer hospitalar, surge como uma via importante de prevenção, identificação e encaminhamento dos pacientes que, por diversos motivos, possam proceder ao suicídio, ou pelo menos à sua tentativa. Per...

  15. Phonon density of states in nanocrystalline 57Fe

    Indian Academy of Sciences (India)

    Ranber Singh; S Prakash; R Meyer; P Entel

    2003-03-01

    The Born–von Karman model is used to calculate phonon density of states (DOS) of nanocrystalline bcc Fe. It is found that there is an anisotropic stiffening in the interatomic force constants and hence there is shrinking in the nearest-neighbour distances in the nanophase. This leads to additional vibrational modes above the bulk phonons near the bottom of the phonon band. It is found that the high energy phonon modes of nanophase Fe are the surface modes. The calculated phonon DOS closely agree with the experimental data except a peak at 37 meV. The calculated phonon dispersion relations are also compared with those of the bulk phonons and anomalous behaviour is discussed in detail. The specific heat in nanophase enhances as compared to bulk phase at low temperatures and the calculated Debye temperature agrees with the experimental results. It is predicted that the nanocrystalline Fe may consist of about 14 GPa pressure.

  16. Electronic structure and magnetism on FeSiAl alloy: A DFT study

    Energy Technology Data Exchange (ETDEWEB)

    Cardoso Schwindt, V.; Sandoval, M.; Ardenghi, J.S.; Bechthold, P.; González, E.A.; Jasen, P.V., E-mail: pjasen@uns.edu.ar

    2015-09-01

    Density functional theory (DFT) calculation has been performed to study the electronic structure and chemical bonding in FeSiAl alloy. These calculations are useful to understand the magnetic properties of this alloy. Our results show that the mean magnetic moment of Fe atoms decreases due to the crystal structure and the effect of Si and Al. Depending on the environment, the magnetic moment of one Fe site (Fe{sub 1}) increases to about 14.3% while of the other site (Fe{sub 2}) decreases to about 25.9% (compared with pure bcc Fe). All metal–metal overlap interactions are bonding and slightly weaker than those found in the bcc Fe structure. The electronic structure (DOS) shows an important hybridization among Fe, Si and Al atoms, thus making asymmetric the PDOS with a very slight polarization of Al and Si atoms. Our study explains the importance of crystal structure in determining the magnetic properties of the alloys. FeSiAl is a good candidate for electromagnetic interference shielding combining low price and good mechanical and magnetic properties. - Highlights: • The mean magnetic moment of the Fe atoms decreases compared to bcc Fe. • There are strong bonding interactions among the Fe, Si and Al atoms. • This structure has a stable ferromagnetism. • The Fe–Fe bonds distances elongates and are weaker than those in the bcc Fe.

  17. Electronic Properties of LiFePO4 and Li doped LiFePO4

    International Nuclear Information System (INIS)

    The potential use of different iron phosphates as cathode materials in lithium-ion batteries has recently been investigated.1 One of the promising candidates is LiFePO4. This compound has several advantages in comparison to the state-of-the-art cathode material in commercial rechargeable lithium batteries. Firstly, it has a high theoretical capacity (170 mAh/g). Secondly, it occurs as mineral triphylite in nature and is inexpensive, thermally stable, non-toxic and non-hygroscopic. However, its low electronic conductivity (∼10-9 S/cm) results in low power capability. There has been intense worldwide research activity to find methods to increase the electronic conductivity of LiFePO4, including supervalent ion doping,2 introducing non-carbonaceous network conduction3 and carbon coating, and the optimization of the carbon coating on LiFePO4 particle surfaces.4 Recently, the Li doped LiFePO4 (Li1+xFe1-xPO4) synthesized at ARL has yield electronic conductivity increase up to 106.5 We studied electronic structure of LiFePO4 and Li doped LiFePO4 by synchrotron based soft X-ray emission (XES) and X-ray absorption (XAS) spectroscopies. XAS probes the unoccupied partial density of states, while XES the occupied partial density of states. By combining XAS and XES measurements, we obtained information on band gap and orbital character of both LiFePO4 and Li doped LiFePO4. The occupied and unoccupied oxygen partial density of states (DOS) of LiFePO4 and 5 percent Li doped LiFePO4 are presented in Fig. 1. Our experimental results clearly indicate that LiFePO4 has wideband gap (∼ 4 eV). This value is much larger than what is predicted by DFT calculation. For 5 percent Li doped LiFePO4, a new doping state was created closer to the Fermi level, imparting p-type conductivity, consistent with thermopower measurement. Such observation substantiates the suggestion that high electronic conductivity in Li1.05Fe0.95 PO4 is due to available number of charge carriers in the material

  18. O Conceito Kantiano de Metafisica dos Costumes

    Directory of Open Access Journals (Sweden)

    Joel Thiago Klein

    2009-06-01

    Full Text Available Neste texto reconstrói-se o conceito kantiano de metafísica dos costumes com o objetivo de apresentar claramente os seus aspectos essenciais, mas sem entrar em questões relativas a sua legitimidade. Nas primeiras duas partes do trabalho mostra-se como Kant reinterpreta a divisão geral da filosofia e como o conceito de uma metafísica dos costumes passa a ser visto a partir do empreendimento crítico-transcendental. Na terceira parte aponta-se para algumas nuances e ambigüidades do conceito de “Metafísica dos costumes”. Por fim, enumera-se os motivos teóricos e práticos a partir dos quais Kant defende a necessidade de uma Metafísica dos costumes.

  19. Validación y las buenas prácticas de fabricación en la producción de ingredientes farmacéuticos activos no esteriles de origen natural.

    OpenAIRE

    José Javier Mosquera Sierra; Leila Cabrera Rabí

    2005-01-01

    El surgimiento de Las Buenas Prácticas de Fabricación (BPF) y del término Validación, se debe a una historia de reacciones a lamentables accidentes y fraudes en la industria farmacéutica que parten desde inicios del pasado siglo. En la actualidad todos los Sistemas de Aseguramiento de Calidad de las organizaciones productoras de Ingredientes Farmacéuticos Activos (IFA) están obligados a establecer un programa de validación para demostrar, con evidencias documentadas, y de acuerdo a los princi...

  20. ORGANIZATIONAL GOOD PRACTICES FOR THE INTEGRATION OF THE ICT IN THE EDUCATION SYSTEM OF EXTREMADURA BUENAS PRÁCTICAS ORGANIZATIVAS PARA LA INTEGRACIÓN DE LAS TIC EN EL SISTEMA EDUCATIVO EXTREMEÑO

    Directory of Open Access Journals (Sweden)

    Mª José Sosa Díaz

    2010-02-01

    Full Text Available The present paper tries to release some organizational Good Practices for the integration of the ICT's carried out by the Education System in Extremadura. For this, in a first moment, a theoretical review about the concept of Good Practices has been done, establishing some indicators which permit us identify Good Practices regarding the application of the ICT within Primary and Secondary schools, and specially pointing out the indicators that refer to organizational aspects in the educational establishments and classrooms. Secondly, the politics for the integration of New Technologies conducted by Junta de Extremadura are analyzed, emphasizing the figure of the ICT Coordinator as a quality measure, as well as the technological tools for school management and controlling the classes. Finally, we present the results obtained from several interviews that were made to different members of the school community, all in a broader investigation where diverse case studies of Primary and Secondary schools considered as Good Practices with ICT were effectuated.En el presente trabajo se pretende dar a conocer Buenas Prácticas de tipo organizativo para la integración de las TIC que ha llevado a cabo el Sistema Educativo Extremeño. Para ello, en un primer momento, se ha realizado una revisión teórica sobre el concepto de Buenas Prácticas, estableciendo algunos indicadores que nos permitan identificar Buenas Prácticas en el uso de las TIC en los centros educativos de Primaria y Secundaria, y destacando especialmente aquellos indicadores que hacen referencia a aspectos organizativos del centro y de las aulas. En segundo lugar, se ha efectuado un análisis de la política de integración de las tecnologías que ha llevado a cabo la Junta de Extremadura, enfatizando en la figura del/la Coordinador/a TIC como medida de calidad, así como en las herramientas tecnológicas de gestión del centro y control del aula. Por último, se presentan algunos resultados

  1. Evaluación de buenas prácticas de manufactura en la elaboración de fórmulas enterales en hospitales públicos de Santiago, Chile

    OpenAIRE

    Sandra Lara González; C. Domecq Jendres; Eduardo Atalah Samur

    2013-01-01

    Antecedentes: La Elaboración de fórmulas enterales está sujeta a diversos riesgos de contaminación. La Organización Mundial de la Salud (OMS) y la Organización para la Alimentación y la Agricultura (FAO) han emitido alertas y recomendaciones para su prevención, sugiriendo la estandarización y protocolización de todos los procedimientos involucrados. Objetivo: Elaborar y evaluar el cumplimiento de los criterios técnicos de una Pauta de Verificación de Buenas Prácticas de Manufactura, con relac...

  2. Sistema de gestión de residuos de construcción y demolición en obras de edificación residencial. Buenas prácticas en la ejecución de obra

    OpenAIRE

    Villoria Sáez, Paola

    2014-01-01

    En el sector de la edificación, las grandes constructoras comienzan a considerar aspectos medioambientales, no limitándose a lo establecido por la legislación vigente, y buscando la implementación de buenas prácticas. Si bien este hecho es una realidad para las grandes empresas constructoras, todavía falta que la gran mayoría de las empresas del sector (pequeñas y medianas) adopten ésta tendencia. En este sentido, las publicaciones y estadísticas consultadas revelan que el sector de la constr...

  3. Implementación de buenas prácticas de promoción de personal y su relación con la cultura y el compromiso con la organización

    OpenAIRE

    Merlin Patricia Grueso Hinestroza

    2010-01-01

    La investigación genera hipótesis y prueba un modelo de relaciones entre los valores de la cultura organizacional, la implementación de una buena práctica de promoción de personal desde la perspectiva de género y el compromiso con la organización. Para la prueba de hipótesis se emplea un modelo de ecuaciones estructurales y se realiza una encuesta a 425 empleados. Los resultados llevan a concluir que los valores distancia al poder y orientación de largo plazo predicen la implementación de bue...

  4. Bienes y servicios ambientales: Mercados no tradicionales, mecanismos de financiamiento y buenas prácticas en América Latina y el Caribe: Actividad 2: Buenas prácticas en la aplicación de mecanismos de financiamiento para la obtención de servicios ambientales de prácticas forestales y agrícolas sostenibles en América Latina y el Caribe

    OpenAIRE

    Francisco Alpízar; Róger Madrigal; Marco Otárola; Carlos J. Pérez; Ricardo González-Jiménez; Mario Niklitschek

    2006-01-01

    Esta es la última versión disponible de este documento que fue comisionado por la Red de Medio Ambiente del Diálogo Regional de Política. El desarrollo del trabajo de esta consultoría consistió de tres actividades principales. Este informe hace referencia a la actividad 2, la cual tiene como objetivo mostrar buenas prácticas en la aplicación de mecanismos de financiamiento para la obtención de servicios ambientales de prácticas forestales y agrícolas sostenibles en América Latina y el Caribe....

  5. Código de buena práctica para el control del dolor oncológico Good practice code for the management of cancer pain

    Directory of Open Access Journals (Sweden)

    J. R. González-Escalada

    2011-04-01

    Full Text Available En muchas ocasiones, los pacientes con cáncer no expresan su dolor por miedo a que el médico desvíe su atención hacia este síntoma, en lugar de centrarse en el tratamiento de su enfermedad principal. No obstante, el paciente debe saber que el tratamiento de su dolor no solo no interfiere con la terapia curativa, sino que colabora con ella. Entre los enfermos, es habitual el temor a que el avance de la enfermedad les lleve a situaciones de sufrimiento insostenible que supere todas las posibilidades médicas, pero es nuestro deber ayudarles a ser conscientes de que la medicina ofrece un abanico de terapias capaces de aliviar su dolor y evitar su sufrimiento. Este conocimiento es esencial para aumentar su confianza en el tratamiento y mejorar la relación médico-paciente. Frente a este desafío, SECPAL (Sociedad Española de Cuidados Paliativos, SED (Sociedad Española del Dolor, SEOM (Sociedad Española de Oncología Médica y SEOR (Sociedad Española de Oncología Radioterápica unen sus esfuerzos y crean ALIADO (Alianza Contra el Dolor Oncológico, un grupo de trabajo interdisciplinario que nace con el objetivo de concienciar e implicar a todo el colectivo médico en la necesidad de mejorar la calidad de vida del paciente con dolor oncológico. La primera iniciativa de ALIADO en este sentido es la elaboración del Código de buena praxis para el tratamiento del dolor oncológico, que pretende contribuir al avance en el conocimiento y el manejo de estos pacientes.Patients with cancer often fail to talk about their pain fearing that their doctor might draw his or her attention to that symptom rather than focus on the management of their underlying disease. However, patients should know that pain management will not interfere with their curative therapy but will supplement it. Fear that the advancing disease will lead to unbearable suffering situations beyond medical possibilities is common among patients, and it is our duty to help them

  6. ¿Es posible un deporte escolar que respete la diferencia? Análisis de buenas prácticas.

    OpenAIRE

    Cobo Corrales, Carlos

    2011-01-01

    RESUMEN:Con este trabajo se pretende hacer una pequeña mención a las similitudes entre la escuela obligatoria actual y el deporte moderno, como dos construcciones sociales encaminadas a categorizar los fenómenos de la educación y la actividad física dentro de un mismo contexto social. Desarrollada esta idea será más fácil extender la idea de “escuela para todos”, a la de “deporte para todos”, como una forma de promover un deporte educativo y el aprovechamiento de sus efectos positivos por ...

  7. Electronic properties of excess Cr at Fe site in FeCr{sub 0.02}Se alloy

    Energy Technology Data Exchange (ETDEWEB)

    Kumar, Sandeep, E-mail: sandeepk.iitb@gmail.com; Singh, Prabhakar P. [Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076 (India)

    2015-06-24

    We have studied the effect of substitution of transition-metal chromium (Cr) in excess on Fe sub-lattice in the electronic structure of iron-selenide alloys, FeCr{sub 0.02}Se. In our calculations, we used Korringa-Kohn-Rostoker coherent potential approximation method in the atomic sphere approximation (KKR-ASA-CPA). We obtained different band structure of this alloy with respect to the parent FeSe and this may be reason of changing their superconducting properties. We did unpolarized calculations for FeCr{sub 0.02}Se alloy in terms of density of states (DOS) and Fermi surfaces. The local density approximation (LDA) is used in terms of exchange correlation potential.

  8. {sup 57}Fe Mössbauer spectroscopy and magnetic study of Al{sub 13}Fe{sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Albedah, Mohammed A.; Nejadsattari, Farshad [Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5 (Canada); Stadnik, Zbigniew M., E-mail: stadnik@uottawa.ca [Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5 (Canada); Przewoźnik, Janusz [Solid State Physics Department, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Kraków (Poland)

    2015-01-15

    Highlights: • We show that Mössbauer spectra of Al{sub 13}Fe{sub 4} can be fitted well with three quadrupole doublets. • The shape of the in-field Mössbauer spectrum is well accounted for with five component subspectra. • The electronic density of states has a pseudogap around the Fermi energy. • We find that the Debye temperature of the compound studied is 383(3) K. - Abstract: The results of ab initio electronic structure and electric field gradient (EFG) calculations, and of X-ray diffraction, {sup 57}Fe Mössbauer spectroscopy, and magnetic studies of Al{sub 13}Fe{sub 4} are reported. It is shown that Al{sub 13}Fe{sub 4} crystallizes in the monoclinic space group C2/m, in which Fe atoms are located at five inequivalent crystallographic sites, with the lattice parameters a=15.503(2) Å, b=8.063(2) Å, c=12.464(2) Å, and β=107.71(2)°. We demonstrate that zero-field Mössbauer spectra can be decomposed into three quadrupole doublets. With the aid of the calculated EFG parameters we show that the first doublet results from one Fe site, the second doublet is due to two other Fe sites, and the third doublet originates from the last two Fe sites. We find that the shape of the Mössbauer spectrum of Al{sub 13}Fe{sub 4} measured in an external magnetic field of 90 kOe can be accounted for with five component subspectra generated using the calculated EFG parameters at five inequivalent Fe sites. The quadrupole splittings corresponding to three component doublets are shown to increase with decreasing temperature and are well described by a T{sup 3/2} power-law relation. The Debye temperature of Al{sub 13}Fe{sub 4} is found to be 383(3) K. We find a pseudogap in the density of states (DOS), with a width of ∼0.2 eV, that is centered 0.1 eV above the Fermi energy. The finite DOS at the Fermi energy confirms good metallicity of Al{sub 13}Fe{sub 4}. The 1/T-like dependence of the magnetic susceptibility shows that Al{sub 13}Fe{sub 4} is a paramagnet.

  9. Distal Hydrogen-bonding Interactions in Ligand Sensing and Signaling by Mycobacterium tuberculosis DosS.

    Science.gov (United States)

    Basudhar, Debashree; Madrona, Yarrow; Yukl, Erik T; Sivaramakrishnan, Santhosh; Nishida, Clinton R; Moënne-Loccoz, Pierre; Ortiz de Montellano, Paul R

    2016-07-29

    Mycobacterium tuberculosis DosS is critical for the induction of M. tuberculosis dormancy genes in response to nitric oxide (NO), carbon monoxide (CO), or hypoxia. These environmental stimuli, which are sensed by the DosS heme group, result in autophosphorylation of a DosS His residue, followed by phosphotransfer to an Asp residue of the response regulator DosR. To clarify the mechanism of gaseous ligand recognition and signaling, we investigated the hydrogen-bonding interactions of the iron-bound CO and NO ligands by site-directed mutagenesis of Glu-87 and His-89. Autophosphorylation assays and molecular dynamics simulations suggest that Glu-87 has an important role in ligand recognition, whereas His-89 is essential for signal transduction to the kinase domain, a process for which Arg-204 is important. Mutation of Glu-87 to Ala or Gly rendered the protein constitutively active as a kinase, but with lower autophosphorylation activity than the wild-type in the Fe(II) and the Fe(II)-CO states, whereas the E87D mutant had little kinase activity except for the Fe(II)-NO complex. The H89R mutant exhibited attenuated autophosphorylation activity, although the H89A and R204A mutants were inactive as kinases, emphasizing the importance of these residues in communication to the kinase core. Resonance Raman spectroscopy of the wild-type and H89A mutant indicates the mutation does not alter the heme coordination number, spin state, or porphyrin deformation state, but it suggests that interdomain interactions are disrupted by the mutation. Overall, these results confirm the importance of the distal hydrogen-bonding network in ligand recognition and communication to the kinase domain and reveal the sensitivity of the system to subtle differences in the binding of gaseous ligands. PMID:27235395

  10. Cuidados Centrados na Família: impacto da formação e de um manual de boas práticas em pediatria Cuidados Centrados en la Familia: impacto de la formación y de un manual de buenas prácticas en pediatria Family-centered care: impact of training and a best practice guide in pediatrics

    Directory of Open Access Journals (Sweden)

    Marta Isabel Correia Gaio Apolinário

    2012-07-01

    Full Text Available Os Cuidados Centrados na Família (CCF constituem uma nova conceção do cuidar pediátrico em que as necessidades das Famílias e Crianças são centrais nesse processo. No entanto, na prática, a sua aplicação nas unidades hospitalares é ainda deficiente, sendo emergente o empenho para que esta filosofia de cuidados se efetive na prática diária dos Enfermeiros. Realizou-se um estudo quase experimental tipo pré teste, pós teste sem grupo de controlo, baseado numa metodologia quantitativa, cujos objetivos foram avaliar o impacto da formação e de um manual de boas práticas nos conhecimentos dos Enfermeiros e na sua perceção quanto à aplicação dos CCF em Pediatria. Da amostra fizeram parte 24 Enfermeiros de um serviço de pediatria a quem foram aplicados três questionários. Confirmou-se que existe diferença positiva nos conhecimentos dos Enfermeiros sobre os CCF e na sua perceção quanto à aplicação desta filosofia na prática diária antes e depois da formação e da implementação do manual de boas práticas, o que demonstra o impacto e eficácia da intervenção desenvolvida na efetivação desta filosofia nas unidades pediátricas.Los cuidados centrados en la familia (CCF constituyen una nueva concepción del cuidar pediátrico en que las necesidades de las familias y de los niños son centrales en dicho proceso. Sin embargo, en realidad, su aplicación en las unidades hospitalarias sigue siendo insuficiente, a pesar de que haya surgido un esfuerzo para que esta filosofía de atención forme parte efectiva de la práctica diaria de los enfermeros. Se realizó un estudio casi experimental, de tipo pre-test y con un post-test sin grupo de control, basado en una metodología cuantitativa, cuyos objetivos fueron evaluar el impacto de la formación y de un manual de buenas prácticas en los conocimientos de los enfermeros y en su percepción con respecto a la aplicación de los CCF en pediatría. La muestra consistió en 24

  11. Bakhtin e a "vida dos outros"

    Directory of Open Access Journals (Sweden)

    Marina Pinheiro

    2010-01-01

    Full Text Available The literary critic and philosopher Mikhail Bakhtin is a name heard in various areas of present-day Human Sciences. One of the main representatives of the dialogism, Bakhtin offers us an aesthetic perspective on the understanding of the subjectivation processes, in which the human singularity would be an outstanding presupposition of his reflections. It is through the reading of the film The lives of others (Buena Vista International, 2006; directed by Florian Henckel von Donnersmarck as a possible bakhtinian metaphor, that this paper brings forward as a refraction field to the debates on the relations between singularity and authorship in the production of the "self". The referred movie takes us to the saga which Gerd Wiesler, an exemplary STASI (East Germany political police secret agent, is cast into when he is put in charge of observing the life of an artists couple, suspected of subversion of the German Democratic Republic's ideals. Mobilized by the daily intimacy of the couple, Wiesler finds, through his responsive unicity, a possible scene for self-redescription. Enraptured by the observance he was assigned to, the hero writes the script of the destiny of the ones he observed in a duel with the otherness of his own history. The lives of others thus is a decentered place, from where an "I" passes to author his becoming.

  12. Vibrational thermodynamics of Fe90Zr7B3 nanocrystalline alloy from nuclear inelastic scattering

    DEFF Research Database (Denmark)

    Stankov, S.; Miglierini, M.; Chumakov, A. I.;

    2010-01-01

    Recently we determined the iron-partial density of vibrational states (DOS) of nanocrystalline Fe(90)Zr(7)B(3) (Nanoperm), synthesized by crystallization of an amorphous precursor, for various stages of nanocrystallization separating the DOS of the nanograins from that of the interfaces [S. Stank......, vibrational entropy, and lattice specific heat as the material transforms from amorphous, through nanocrystalline, to fully crystallized state. The reported results shed new light on the previously observed anomalies in the vibrational thermodynamics of nanocrystalline materials....

  13. Physical Properties of Intermetallic FE2VA1

    International Nuclear Information System (INIS)

    Fe2VAl has recently been discovered to have a negative temperature coefficient of resistivity, moderately enhanced specific heat coefficient, and a large DOS at the Fermi level by photoemission. This triggered a round of heated research to understand the ground state of this material, both theoretically and experimentally. here they report a comprehensive characterization of Fe2VAl. X-ray diffraction exhibited appreciable antisite disorder in all of our samples. FTIR spectroscopy measurements showed that the carrier density and scattering time had little sample-to-sample variation or temperature dependence for near-stoichiometric samples. FTIR and DC resistivity suggest that the transport properties of Fe2VAl are influenced by both localized and delocalized carriers, with the former primarily responsible for the negative temperature coefficient of resistivity. Magnetization measurements reveal that near-stoichiometric samples have superparamagnetic clusters with at least two sizes of moments. X-ray photoemission from Fe core level showed localized magnetic moments on site-exchanged Fe. They conclude that in Fe2VAl, antisite disorder causes significant modification to the semi-metallic band structure proposed by LDA calculations. With antisite disorder considered, they are now able to explain most of the physical properties of Fe2VAl

  14. Vibrational properties of alpha- and sigma-phase Fe-Cr alloy

    OpenAIRE

    Dubiel, S. M.; Cieslak, J.; Sturhahn, W.; Sternik, M.; Piekarz, P; Stankov, S.; Parlinski, K.

    2010-01-01

    Experimental investigation as well as theoretical calculations, of the Fe-partial phonon density-of-states (DOS) for nominally Fe_52.5Cr_47.5 alloy having (a) alpha- and (b) sigma-phase structure were carried out. The former at sector 3-ID of the Advanced Photon Source, using the method of nuclear resonant inelastic X-ray scattering, and the latter with the direct method [K. Parlinski et al., Phys. Rev. Lett. {78, 4063 (1997)]. The characteristic features of phonon DOS, which differentiate on...

  15. BUENAS PRÁCTICAS DE INNOVACION: UN ESTUDIO EXPLORATORIO DE EMPRESAS TECNOLÓGICAS EN EL SECTOR AUDIOVISUAL ESPAÑOL

    Directory of Open Access Journals (Sweden)

    Suñe, Albert

    2012-05-01

    Full Text Available El principal objetivo de esta investigación es contribuir a la comprensión de la capacidad de innovación. Más concretamente, la investigación se centra en describir las prácticas utilizadas para construir y desarrollar la capacidad de innovación en dos empresas innovadoras de base tecnológica (EIBT del sector audiovisual español. Por medio de un estudio de casos múltiple basado, principalmente, en entrevistas con los responsables de los proyectos de desarrollo de nuevos productos, se ha identificado un conjunto de 17 prácticas clasificadas en tres dimensiones: estrategia de innovación, cultura innovadora y estructura del proceso de innovación. Este conjunto de prácticas ha promovido la obtención de buenos resultados en los proyectos de desarrollo de nuevos productos en las empresas estudiadas.

  16. Regenerated Fe is tasty!

    Science.gov (United States)

    Nuester, J.; Twining, B. S.

    2012-12-01

    Bioavailability of nutrients is an essential factor controlling primary productivity in the ocean. In addition to macronutrients such as nitrogen and phosphorous, availability of the trace element iron unequivocally affects growth rates and community structure of phytoplankton and thereby primary productivity in many ocean regions. External sources of iron such as Aeolian dust, upwelling of Fe-rich waters, and hydrothermal are reduced in high-nutrient low-chlorophyll regions, and most Fe used by phytoplankton has been regenerated by zooplankton. While zooplankton regeneration of Fe was first shown two decades ago, major factors controlling this process such as chemical composition of prey and grazer taxonomy are not well constrained. As pH varies significantly in digestive systems between protozoa and mesozooplankton, we hypothesize that the extent and the bioavailability of regenerated Fe is a function of the digestive physiology. Furthermore, major element components such as silica for diatoms and calcium carbonate for cocolithophores may be able to buffer the pH of digestive systems of different grazer taxa. Such effects may further influence the magnitude and bioavailability of regenerated Fe. In order to constrain the effect of grazer taxonomy and chemical composition of prey on Fe bioavailability, 55Fe-labeled phytoplankton were fed to different grazers and unlabeled phytoplankton were subsequently inoculated to the filtrate of the grazing experiment in the regrowth phase of the experiment, and the uptake of 55Fe into the phytoplankton biomass was monitored over time. A parallel uptake experiment using inorganic 55Fe was used to compare the bioavailability of regenerated and inorganic Fe to the same phytoplankton species. Furthermore, some samples of the inorganic and the regenerated uptake experiments were treated with an oxalate rinse to remove any adsorbed Fe. This allowed us to estimate the adsorption of 55Fe from either source to the cell walls of

  17. BENEFÍCIOS DOS PARQUES URBANOS

    Directory of Open Access Journals (Sweden)

    Raphael Tavares Pacheco Martins

    2014-07-01

    Full Text Available Esta pesquisa teve como objetivo apresentar o tema e analisar os benefícios gerados pelos parques urbanos. Para a sua realização foi definido como zona de estudo a região norte do estado do Rio de Janeiro. Os outros objetivos foram a qualificação e a definição das funções do parque e a elucidação da sua contribuição para a melhoria da qualidade de vida. Além do lazer, outras funções socioambientais relevantes são desempenhadas pelos parques urbanos destacando-se a psicológica, a reconstrução da tranquilidade, a recomposição do temperamento, atenuante de ruídos e condicionador do microclima, impondo a sua inclusão no planejamento e nas políticas públicas das cidades. A pesquisa foi estruturada por um levantamento histórico e uma revisão bibliográfica. Um dos principais efeitos dos parques urbanos é a amenização climática, com contribuições positivas para o microclima local. No passar dos anos por conta dos grandes lucros as empresas privadas levaram o conjunto urbano para um crescimento desordenado e minimizando a função social dos parques urbanos, criando problemas sociais, esquecendo-se dos valores pessoais, históricos, culturais alem da dimensão sensorial e psicológica.

  18. Manual dos chefes de missão dos CONs: Rio 2016 : Abril 2016

    OpenAIRE

    2016-01-01

    Publicado em abril de 2016, o « Manual dos chefes de missão » oferece aos CONs uma visão detalhada dos serviços disponíveis durante os Jogos Olímpicos Rio 2016, assim como das operações durante os Jogos.

  19. Good faith en el ejercicio de poderes contractuales discrecionales (¿Un punto de contacto entre Common Law y Civil Law?

    Directory of Open Access Journals (Sweden)

    Javier Humberto Facco

    2012-06-01

    Full Text Available La buena fe es no solo uno de los dos polos de la definición celsina del derecho, sino también quizás el más relevante principio general de la tradición jurídica continental-europea. Herencia directa del mundo romano, la buena fe ha recobrado su posición central en particular en la teoría de las obligaciones y contratos, donde encuentra su mayor desarrollo. En los tiempos que corren la buena fe ha sido también objeto de análisis y consideración en ámbito de la tradición del derecho anglo-americano. Precisamente este artículo busca señalar zonas de contacto entre las dos tradiciones en materia de buena fe y su relación con la libertad contractual, sus efectos en la exigibilidad de la prestación, la determinación del precio, las modalidades de la ejecución del contrato y el ejercicio de la discrecionalidad de las partes. Este análisis sugiere al lector las cuestiones de la buena fe y las razonables previsiones de las partes en el tejido contractual, y de allí su relación con las fuentes de integración del contrato.

  20. Contabilidade criativa e responsabilidade dos auditores

    OpenAIRE

    Ariovaldo dos Santos; Ivan Ricardo Guevara Grateron

    2003-01-01

    Nos contextos nacional e internacional da profissão contábil, o auditor tem exercido um papel fundamental. A atividade profissional do auditor independente tem ajudado a impulsionar o desenvolvimento dos mercados, além de contribuir para o estabelecimento da ordem socioeconômica mundial. Na visão dos usuários externos da informação contábil, e dos próprios clientes, a atuação do auditor é sinônimo de confiança e credibilidade. Nos últimos meses, a onda de escândalos contábeis, com grandes emp...

  1. Buenas prácticas profesionales en la atención a las personas con dolor Bost professional practices in the attention given to people in pain

    Directory of Open Access Journals (Sweden)

    P. Brea Rivero

    2011-10-01

    Full Text Available Introducción: El dolor tiene graves consecuencias emocionales, sociales y económicas para las personas que lo sufren, e incrementa por cinco la probabilidad de utilización de los servicios sanitarios. Por primera vez en España, la Consejería de Salud de la Junta de Andalucía ha puesto en marcha un Plan de Atención a las Personas con Dolor que pretende garantizar la atención integral de éstas, mejorando su calidad de vida y la atención de sus necesidades a lo largo de todo el proceso asistencial. Desde el año 2004, la Agencia de Calidad Sanitaria de Andalucía, como entidad certificadora del Sistema de Acreditación del Sistema Sanitario Público de Andalucía (SSPA, ha establecido un Modelo de Acreditación de la Competencia Profesional que pretende reconocer la excelencia de los profesionales y ayudarles en su desarrollo y mejora continua. Este modelo se basa en un proceso a través del cual los profesionales verifican la proximidad entre sus competencias y buenas prácticas reales, y las definidas en sus correspondientes Manuales de Competencias. Objetivo: Este trabajo pretende describir los elementos relacionados con la atención a las personas con dolor, contenidos en los Manuales de Competencias y puestos de manifiesto por los profesionales que han alcanzado la acreditación de sus competencias mediante el Modelo de Acreditación del SSPA. Material y método: Análisis descriptivo transversal de los elementos relacionados con la atención a las personas con dolor contenidos en los Manuales de Competencias, y porcentaje de cumplimiento de dichos elementos aportados por los profesionales que accedieron al Programa. Resultados: El Manual que presentó mayor número de elementos relacionados con el abordaje del dolor fue el de Medico/a de Equipos y/o Centros de Coordinación de Emergencias Sanitarias. Los Manuales en los que más del 70% de los profesionales acreditados han aportado evidencias relacionadas con el dolor corresponden a

  2. La larga vida de dos rocas orensanas

    OpenAIRE

    García Quintela, Marco V.; Seoane-Veiga, Yolanda

    2011-01-01

    [ES] Se estudian dos rocas, un petroglifo y un «santuario rupestre » de la provincia de Ourense, con dos metodologías complementarias, la arqueología del paisaje y la «biografía» (Kopytoff) de los objetos. Partiendo de su descripción en textos cristianos se considera el patrón de localización que conforman en relación con castros importantes, relación que se propone fechar en la Edad del Hierro. Esta adscripción cronocultural y su posterior resemantización cristiana lleva a la consideración d...

  3. Conhecimento sobre sida e sexualidade dos adolescentes

    OpenAIRE

    Bento, Ermelinda Manuela Teixeira; Ferreira, Manuela Maria Conceição; Chaves, Cláudia Margarida Correia Balula; Duarte, João Carvalho

    2013-01-01

    A Síndrome de Imunodeficiência Adquirida (SIDA) assume-se como o mais grave problema de saúde pública da era moderna, apelidada pela OMS como a Primeira Crise Mundial da Saúde é uma doença que transpõe a sua índole de patologia do sistema imunitário anunciando-se como uma doença social, de índole comportamental que tem nos adolescentes um dos grupos de maior vulnerabilidade. De acordo com os dados da UNAIDS (2012), o grupo etário dos 15 aos 24 anos representa o agregado de maio...

  4. El cuidado a la salud bucal del anciano: buenas prácticas fundamentadas en el paradigma de la promoción de la salud Oral health care of the aged: good practices based on health promotion paradigm

    OpenAIRE

    Ana Lúcia Schaefer Ferreira de Mello; Calvino Reibnitz Junior; Alacoque Lorenzini Erdmann

    2009-01-01

    Presenta la elaboración de un referente de buenas prácticas del cuidado a la salud bucal a la población anciana, basado en la Promoción de la Salud (PS). El método adoptado fue el de la Teoría Fundamentada en los Datos. El referencial teórico-práctico se describe para guiar el desarrollo de acciones en consonancia con el paradigma de la PS según la Carta de Ottawa y sus cinco áreas. Es necesario considerar estas prácticas de cuidado como un objetivo a alcanzar y contribuir al progreso sosteni...

  5. Buenas prácticas para el diseño e implementación de sistemas nacionales de monitoreo para la adaptación al cambio climático

    DEFF Research Database (Denmark)

    Naswa, Prakriti; Trærup, Sara Lærke Meltofte; Bouroncle, Claudia;

    En este informe identificaremos, analizaremos y compararemos buenas prácticas internacionales dediseño e implementación de indicadores para sistemas de monitoreo y evaluación para la adaptación alcambio climático. El primer capítulo ofrece una introducción al contexto y la terminología clave en el...... temade adaptación al cambio climático e indicadores de M&E para la adaptación. El segundo capítulo analizalos enfoques de M&E existentes, mientras que el capítulo 3 ofrece un panorama general de los enfoquesde M&E para la adaptación al cambio climático. Los capítulos 4 y 5 definen y discuten la...

  6. Factores socio-económicos asociados a la percepción de situación socioeconómica entre adultos mayores de dos países latinoamericanos

    Science.gov (United States)

    Brenes-Camacho, Gilbert

    2014-01-01

    El objetivo principal del artículo es estudiar la asociación entre la percepción subjetiva sobre la situación económica propia y una serie de medidas objetivas de bienestar socioeconómico –fuentes de ingresos, tenencia de vivienda, nivel educativo y transferencias familiares informales de dinero- entre adultos mayores de dos países Latinoamericanos: México y Costa Rica. Los datos se obtienen de las primeras rondas de dos encuestas sobre envejecimiento: CRELES para Costa Rica y ENASEM para México. La variable dependiente más importante se obtiene de las respuestas a las pregunta “¿Cómo califica su situación económica actual?” en Costa Rica y “¿Diría usted que su situación económica es…?” en México. Para ambas encuestas, las respuestas se codificaron en forma binaria; el código 0 representa las categorías Excelente, Muy buena y Buena, y el código 1 representa a las categorías Regular y Mala. Se encontró que el ingreso por jubilación es un importante determinante de la percepción de bienestar en ambos países. En Costa Rica, el ingreso del cónyuge y la tenencia de vivienda son importantes predictores de la percepción de bienestar, mientras que en México, los ingresos por transferencias están fuertemente asociados con dicha percepción. PMID:25360057

  7. Consistentie met MS-DOS software

    NARCIS (Netherlands)

    Olsthoorn TN

    1988-01-01

    Zonder de keuze van een zekere standaard-lijn ten aanzien van de software die men zelf gebruikt, kan nauwelijks efficient met een computer worden gewerkt. Onder UNIX en op de Macintosh is het gebruik van programma's en de uitwisseling van gegevens daartussen gestandaardiseerd. Onder MS-DOS

  8. A Teoria dos Conjuntos de Cantor

    Directory of Open Access Journals (Sweden)

    Antônio Acra Freiria

    1992-07-01

    Full Text Available No final dos anos 50 e começo doe anos 60, houve uma reformulação significativa da Matemática no Brasil. Sob a bandeira do modernismo, seus defensores buscaram inovações no ensino da Matemática. Dessa forma, os reformistas se concentraram essencialmente na linguagem abusiva e no formalismo da Teoria dos Conjuntos, o que trouxe mais danos do que benefícios do ensino da Matemática de 1º e 2ºgraus. A linguagem formal da Teoria dos Conjuntos é porém sua parte menos importante. A teoria criada por Cantor tão logo revelou-se como o fundamento de toda a Matemática, possibilitando o desenvolvimento de novas disciplinas, como a Topologia, a Algebra Abstrata, a Teoria da Medida e Integração, a Teoria da Probabilidade e a Análise Funcional. O objetivo deste trabalho é um relato sucinto de como surgiu essa teoria, apresentando o "Conjunto de Cantor" como um dos mais ricos exemplos de "Conjunto perfeito" encontrados na literatura matemática.

  9. Dos realizaciones prefabricadas en Bolonia/Italia

    Directory of Open Access Journals (Sweden)

    Salas, Julián

    1981-04-01

    Full Text Available Se describen dos obras realizadas mediante elementos prefabricados en Bolonia (Italia por la empresa Grandi Lavori. Se trata de un conjunto de tres grandes torres con proyecto del profesor Kenzo Tange y una construcción-piloto en el recinto ferial.

  10. PERFIL E EXPECTATIVAS DOS ALUNOS CONCLUINTES DOS CURSOS TECNICOS INTEGRADOS DO IFRN, CAMPUS APODI

    Directory of Open Access Journals (Sweden)

    Saara Ramila Gurgel de Oliveira

    2014-11-01

    Full Text Available Este trabalho teve por finalidade caracterizar o perfil e as expectativas dos alunos dos terceiros e quartos anos dos cursos técnicos integrado de Zootecnia e Biocombustíveis do Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte – Campus Apodi. A pesquisa foi realizada com 138 alunos, através da aplicação de questionários com perguntas abertas e fechadas. A análise dos dados foi realizada de maneira descritiva e os mesmos apresentados em percentuais. Os principais resultados mostraram que as mulheres são maioria (60,9% e que a idade média foi de 17,4 anos. 99,3% dos alunos afirmaram querer cursar uma faculdade e a Universidade Federal do Rio Grande do Norte foi a instituição mais citada. Os cursos mais citados pelos discentes foram: Medicina, Ciência e tecnologia, Engenharia química, Engenharia civil, Direito e Medicina veterinária. Quanto a prática profissional, 89,9% dos alunos a realizam na forma de projetos de pesquisa ou extensão e 10,1% na forma de estágios. Mais de 97% dos estudantes estão satisfeitos com as disciplinas, porém 64,5% não estão satisfeitos com a quantidade de aulas práticas dos cursos. Quanto ao mercado de trabalho, 58,8% acreditam que há boas oportunidades. Dessa forma, conclui-se que são necessárias medidas para qualificar o ensino dos alunos, todavia, as mesmas dependem de uma gestão democrática que analise a opinião de toda a comunidade escolar.

  11. Solubilidade e disponibilidade dos micronutrientes em fertilizantes

    Directory of Open Access Journals (Sweden)

    F. Vale

    1999-06-01

    Full Text Available A legislação brasileira exige que os micronutrientes nos fertilizantes sejam garantidos pelo teor total presente. Isto abre um precedente para a utilização de produtos não considerados como fontes de micronutrientes na fabricação dos fertilizantes. Todavia, a eficiência agronômica desses produtos é ainda duvidosa. Objetivou-se realizar um trabalho para caracterizar a solubilidade e a disponibilidade dos micronutrientes em trinta fertilizantes comerciais, por meio do uso de cinco extratores químicos: a água e soluções de ácido cítrico a 2%, de citrato neutro de amônio na diluição 1 + 9, de DTPA 0,005 mol L-1 e de EDTA 0,005 mol L-1. Os resultados mostraram a baixa solubilidade dos micronutrientes metálicos (cobre, ferro, manganês e zinco dos fertilizantes tipo "fritas". O ácido cítrico a 2% mostrou-se promissor na caracterização da disponibilidade de cobre, manganês e zinco para as plantas. Para o ferro não houve uma definição entre os extratores estudados. O boro teve boa solubilidade, tanto nos fertilizantes solúveis, como nos insolúveis em água, e a garantia pelo teor total mostrou-se bom indicativo da disponibilidade do elemento. Para o molibdênio a solubilidade foi maior para os fertilizantes com baixo teor do elemento. A garantia dos micronutrientes catiônicos pelo teor total, conforme exige a legislação, não indicou a sua real disponibilidade nos fertilizantes comerciais, mostrando a necessidade de uma definição de extratores para esse fim.

  12. Titanium 1990: Products and applications; Proceedings of the International Conference, Buena Vista, FL, Sept. 30-Oct. 3, 1990. Vols. 1 and 2

    International Nuclear Information System (INIS)

    The present conference on Ti-based products and their applications discusses Ti alloy products and applications in China and the USSR, the use of IMI 834 in aircraft engines, Ti-6Al-4V forgings with enhanced fatigue resistance, hydrogen embrittlement of titanium aluminides, cold-rolled Ti alloy foils, Ti alloy multiwall structures, leading-edge erosion of large Ti alloy blades, a novel Cu-Fe-Ti alloy, anodization of Ti for space applications, Ti alloy property improvement via ion implantation, and Co-W-Ti alloy electroplating. Also discussed are the backbone-process fabrication of Ti heat-exchanger tubes, fiber-delivery laser welding of Ti alloy tubing, a novel low-alloy/high-strength Ti composition, the weldability of titanium aluminide, the casting of dental Ti crowns, isothermal forging of Ti-alloy surgical implants, high-speed heat treatment for Ti alloys, cold-roll extrusion of Ti-6Al-4V cylinders, temperature profiles in Ti sponge production, and the superplasticity of eutectoidally decomposed Ti alloys

  13. Application of Al/B/Fe2O3 Nano Thermite in Composite Solid Propellant

    OpenAIRE

    Jingke Deng; Guoping Li; Lianhua Shen; Yunjun Luo

    2016-01-01

    Hydroxyl-terminated polybutadiene (HTPB) propellant were prepared with different content of Al/B/Fe2O3 nano thermite, and the mechanical, thermal and energetic performances were studied. Al/B/Fe2O3 nano thermite exhibited good compatibility with HTPB and dioctyl sebacate (DOS) through differential scanning calorimetry (DSC) tests. Mechanical experiments show that the mechanical properties of HTPB propellant could be improved by the addition of a small quantity of Al/B/Fe2O3 nano thermite, com...

  14. impacto na cavidade oral dos pacientes

    OpenAIRE

    Barros, Gisela Cristina Moreira

    2010-01-01

    A Síndrome de Sjögren (SS) é uma patologia de origem autoimune, que se caracteriza imunológicamente, por um infiltrado linfocitário nas glândulas salivares e lacrimais dos indivíduos afectados. A SS pode-se dividir em Síndrome de Sjögren Primário e Síndrome de Sjögren Secundário. Os principais sintomas são a secura da boca, dos olhos e o cansaço extremo. A infiltração plasmática e linfocitária nas glândulas exócrinas e, consequentemente, a produção de auto-anticorpos, leva a...

  15. Metabolismo dos lípidos

    OpenAIRE

    Ibarguren Arizeta, Izaskun

    2011-01-01

    Esta unidade didáctica, Metabolismo dos lípidos, englóbase dentro da materia Bioquímica que se imparte na titulación de Grao en Veterinaria. No plano de estudos, a materia está integrada no módulo de formación básica común, impártese no primeiro semestre do primeiro curso, e ten una carga lectiva de 6 créditos ECTS. Así pois, os destinatarios son alumnos de primeiro curso de veterinaria. A Bioquímica estuda as bases moleculares dos seres vivos, isto é, como son, como interaccionan e a ...

  16. DOS: the discrete-ordinates system

    International Nuclear Information System (INIS)

    The Discrete Ordinates System determines the flux of neutrons or photons due either to fixed sources specified by the user or to sources generated by particle interaction with the problem materials. It also determines numerous secondary results which depend upon flux. Criticality searches can be performed. Numerous input, output, and file manipulation facilities are provided. The DOS driver program reads the problem specification from an input file and calls various program modules into execution as specified by the input file

  17. Dos nuevos puentes ligeros, en Alemania

    Directory of Open Access Journals (Sweden)

    Bay, Hermann

    1961-03-01

    Full Text Available Las dos obras, objeto de ligera descripción en este trabajo, dan patentes muestras de las direcciones generales en el orden constructivo hacia la belleza, esbeltez y función específica, objeto éste, que ha de cubrir las exigencias de la explotación pública, en este caso, de la obra.

  18. Defesa dos direitos humanos: sistemas regionais

    Directory of Open Access Journals (Sweden)

    Hélio Bicudo

    2003-04-01

    Full Text Available O texto discorre sobre a institucionalização dos sistemas de promoção dos Direitos Humanos, ao longo do século XX. Tomando a Declaração Universal dos Direitos do Homem, de 1948, como base e ponto de partida, o articulista aborda as três principais vertentes dos sistemas de promoção desses direitos: a européia, a americana e a africana. A evolução de cada uma delas descrita analógica e epistemologicamente, de forma a salientar singularidades sem perder de vista as influências recíprocas ou mesmo as determinantes próprias do contexto espaço-social. Para finalizar, o articulista destaca a importância do Tribunal Penal Internacional no estabelecimento de uma justiça ecumênica. Concomitantemente, alerta para o perigo contido na ameaça de os EUA não o ratificarem.The text underlines the institutional character acquired by the main systems to promote Human Rights in the twentieth century. Taking the Universal Human Rigths Declaration, of 1948, as the basis for analysis, the author brings up three different approaches to promote these rights: the European, the American and the African. The evolution of each of them is described using its procedure as a basic reference. Besides, an analogical analysis, brings to the fore singularities, without ignoring reciprocal influences dictated by particular contexts, though. The author stresses the importance of the International Penal Court, as a means to establish ecumenical justice. At the same time, he reminds the reader of the risks implicit in the possible non-ratification of the IPC by United States.

  19. QUE LA DICHA HERIDA SE LA DIO DE BUENA, SIN QUE INTERVINIESE TRAICIÓN ALGUNA...: EL ORDENAMIENTO DEL ESPACIO FRONTERIZO MAPUCHE, 1726-1760

    Directory of Open Access Journals (Sweden)

    LEONARDO LEÓN

    2011-10-01

    Full Text Available Nadie reconocía en él patria ni bandera. Cuando llegaba a los pagos de Quirihue, Rere, San Pedro, Tinguiririca, Puchacay o Maule, los inquilinos y mayordomos de las haciendas rehuían de su compañía porque leían en las cicatrices de su rostro, en los tatuajes de su cuerpo o en su hablar tosco y extraño, al hombre que vivía recorriendo caminos, huyendo de su propio nombre y de la justicia. Procreado en la violencia de un momento que nadie recordaba, su vida se inició en el mundo de los miserables, recogiendo las migajas con sabor a vino y cebolla, a charqui y queso añejo, para luego cazar furtivamente corderos, cabras y gallinas que degollaba con inusual calma para alimentar a su madre y a sus hermanastros; su juventud pasó entre muchas pendencias, grillos, cadenas, cepos y amores, aventuras y malones, para convertirse en hombre el día aciago en que por primera vez limpió de la hoja de su cuchillo la sangre de otro ser humano. Siempre llegaba y se iba en silencio, sin más nombre que sus apodos, que hablaban de otras muertes y de otras tierras, de asaltos, cuatrerismo y picardías; muchos se medían contra su sombra, otros se afanaban por ser sus conocidos y muy pocos podían llamarle amigo; bebedor incansable de aguardiente durante la vendimia y cantor alegre en las pulperías de extramuros, era un jugador empedernido de dados y naipes, de rayuelas y carreras ‘a la chilena’. Transitaba como sombra por fuertes, pagos y villas, puestos y vados, dejando tras de sí la extraña sensación de nunca haber pisado esa tierra. Sus historias en las noches lluviosas eran interminables, atrayendo sobre sí el halo de los hombres solitarios y andariegos que deslumbraban a las mujeres y niños, y que ejercían una fatal envidia entre los huasos e inquilinos. En su vida se entrecruzaban corregidores, comandantes y cabos de fuertes con la misma abundancia que lonkos, machis y caciques; hablaba con facilidad las dos lenguas, preparaba pócimas de

  20. O mundo dos bens, vinte anos depois

    Directory of Open Access Journals (Sweden)

    Mary Douglas

    2007-12-01

    Full Text Available A partir do anúncio da reedição de seu livro O Mundo dos Bens, publicado originalmente em 1979, a autora faz uma reflexão do contexto intelectual em que sua obra foi fundamentada. Ela discute as bases da importância do estudo do consumo para a economia e para a antropologia, salientando que isso pode contribuir para alcançar o projeto de "totalidade" dos fenômenos sociais, na perspectiva de Marcel Mauss - autor que teve grande influência para O Mundo dos Bens. O artigo ainda mostra trabalhos e debates clássicos sobre o tema das trocas que contribuíram para as reflexões desenvolvidas no livro. É retomado o argumento de que a pobreza deve ser entendida como um processo de exclusão de informação e, nesse sentido, a autora expõe porque o estudo sobre o consumo é de grande valia para a antropologia.Taking into account the announcement of the re-edition of her book The World of Goods, originally published in 1979, the author develops a reflection on the intellectual context in which her work was created. She discusses the bases of the importance of Consumption Studies for Economics and Anthropology, suggesting that they help to attain the project of "totality" in the study of social phenomena, following the notion of Marcel Mauss - an author who exerted a great influence in the The World of Goods. The article also analyses classical works and discussions about exchanges that contributed to the reflections developed in the book. She resumes her central point, that is, that poverty must be understood as a process concerning the exclusion of information. In this sense, she presents the reasons the study on consumption is of great value for Anthropology.

  1. Silvina Ocampo: la vejez en dos tiempos

    OpenAIRE

    Mancini, Adriana

    2004-01-01

    El presente artículo aborda la representación de la vejez y la muerte en dos momentos de producción de la obra de Silvina Ocampo. La configuración y el comportamiento de ciertos personajes de una serie de cuentos de Viaje olvidado (1937), La furia y otros cuentos (1959) y Los días de la noche (1970) manifiestan aspectos constitutivos de la vejez; por su parte, los últimos textos de Cornelia frente al espejo (1988) presentan la conflictiva relación entre el viejo, su vejez y la muerte.

  2. Por uma carta dos bens fundamentais

    Directory of Open Access Journals (Sweden)

    Luigi Ferrajoli

    2010-07-01

    Full Text Available Este artigo questiona a possibilidade de a estipulação dos direitos fundamentais, e suas obrigações e proibições correspondentes, ser suficiente para garantir adequadamente as necessidades e os interesses vitais, em especial aqueles de interesse coletivo. São bens fundamentais aqueles cujo acesso é garantido a todos e a cada um, visto que são objetos dos direitos fundamentais subtraídos à lógica do mercado. A garantia de novos bens como bens fundamentais exige uma decisão política civilizatória de submeter ao direito as relações de mercado. Assim, às cartas e convenções internacionais e constitucionais de direitos fundamentais deveriam ser acrescentadas Cartas Constitucionais e Cartas Internacionais de bens fundamentais. Daí a necessidade de uma nova dimensão do constitucionalismo garantista: a longo prazo, além de global, para além da lógica individualista dos direitos e da miopia, e do estreito localismo da política das democracias nacionais.AbstractThis article addresses the question of whether the stipulation of fundamental rights and obligations and prohibitions related to them is sufficient to properly ensure the needs and vital interests, especially those from collective interest. Fundamental goods are those whose access is guaranteed to each and every one since they are the object of fundamental rights, excluded from the logic of the market. The warranty for new goods and basic goods in the bottom of civilization requires a political decision to submit the right market relations. Thus, to the international charters and conventions and fundamental constitutional rights should be added Charters and international charter of basic goods. Hence the need for a new dimension of the constitutionally guaranteed: a constitutionally guaranteed in the long term, and global, apart from the individualistic logic of rights and shortsightedness and narrow localism policy of national democracies.

  3. Lista dos Anelídeos (Annelida)

    OpenAIRE

    Paulo A V Borges

    2010-01-01

    A diversidade das minhocas (Annelida) é aqui compilada, em adição aos grupos de animais terrestres listados em detalhe noutros capítulos deste livro (Platyhelminthes, Nematoda, Mollusca, Arthropoda, Chordata). Com base na recente lista de espécies animais terrestres da Europa, projecto “Fauna Europaea” (http:// www.faunaeur.org), listam-se 21 espécies de anelí deos terrestres. É apresentada a distribuição das espécies ou subespécies nas nove ilhas dos Açores, usando-se a seguinte simbologia: ...

  4. Sobre a peleja dos sujeitos da reforma, ou da reforma dos sujeitos em peleja

    Directory of Open Access Journals (Sweden)

    Gastão Wagner de Sousa Campos

    1992-01-01

    Full Text Available O presente trabalho analisa os principais impasses da reforma sanitária brasileira, bem como avalia a atuação do movimento de saúde a nível das instituições. Aplicando à saúde conceitos de Gramsci, F. Guattari e Castoriadis, com o objetivo de identificar os processos de construção da subjetividade dos trabalhadores de saúde, propõe-se caminhos para a reforma dos sujeitos sociais nas práticas de saúde e como atores de um processo político de reforma.

  5. Lista preliminar dos Nematoda, Annelida e Chordata terrestres dos Açores

    OpenAIRE

    Paulo A V Borges

    2005-01-01

    Apresenta-se uma lista preliminar dos Filos Nematoda, Annelida e Chordata terrestres dos Açores. Com base na recente lista de espécies animais terrestres da Europa, projecto “Fauna Europaea” (http://www.faunaeur.org), listam-se 80 espécies de nemátodos e 21 espécies de anelídeos terrestres. As cerca de 49 espécies de vertebrados (Chordata) listados correspondem às espécies que se reproduzem nos Açores. ABSTRACT: A preliminary list of the Phyla Nematoda, Annelida and Chordata was compiled. ...

  6. Guía de buenas prácticas de seguridad informática en el tratamiento de datos de salud para el personal sanitario en atención primaria

    Directory of Open Access Journals (Sweden)

    Ana Sánchez-Henarejos

    2014-04-01

    Full Text Available Con la introducción de la historia clínica digital surge la necesidad de reforzar la seguridad de los datos personales de salud para garantizar su privacidad. A pesar de la gran cantidad de medidas de seguridad técnicas y de recomendaciones existentes para el ámbito sanitario, hay un aumento en las violaciones de la privacidad de los datos personales de los pacientes en centros sanitarios, en muchos casos como consecuencia de errores o descuidos de los profesionales sanitarios. En este trabajo se presenta una guía de buenas prácticas de seguridad informática en la manipulación de los datos personales de salud por parte del personal sanitario, elaborada a partir de recomendaciones, normativa y estándares nacionales e internacionales. El material presentado en este trabajo puede emplearse tanto en la formación como en auditorías de seguridad informática a trabajadores de los centros de atención primaria.

  7. Deontología profesional en Información Médica en la industria farmacéutica: en el camino hacia un código español de buenas prácticas

    Directory of Open Access Journals (Sweden)

    Rojo Abril, Mónica

    2016-07-01

    Full Text Available Introducción: En España, la Industria Farmacéutica es uno de los principales proveedores de Información Médica dentro del ámbito de la salud. En su compromiso con el servicio que proporcionan, los Técnicos de Información Médica (TIM echan en falta un marco deontológico que guíe su actividad y garantice la calidad, la equidad y el equilibrio de la información que proporcionan a los profesionales sanitarios. Objetivo: En su camino hacia un código español de buenas prácticas, el Grupo de Trabajo de Información Médica de la Asociación de Medicina de la Industria Farmacéutica (AMIFE quiere presentar a la comunidad profesional el marco deontológico en que se manifiesta su reflexión ética, así como establecer los puntos de partida sobre los que afronta la elaboración de un texto accesible a todos los profesionales del sector y a las empresas que proporcionan y respaldan sus actividades.

  8. Buenas prácticas de aplicación en cultivos planos extensivos: Distancias a zonas urbanas. Criterios y soluciones Good practices of application on extensive flat crops: Distances to urban areas. Criterions and salutions

    Directory of Open Access Journals (Sweden)

    Alberto Etiennot

    2010-12-01

    Full Text Available El presente trabajo engloba todos los conocimientos actuales y disponibles técnico científicos con respecto a las aplicaciones de agroquímicos en proximidad a las zonas periurbanas y urbanas, considerando los diversos factores que contribuyen a un eficiente y eficaz trabajo agrícola, sugiriendo prácticas y estableciendo distancias a favor de la seguridad de la población y de las Buenas Prácticas Agrícolas. Concluyendo en un cuadro de sugerencias basado en la toxicidad aguda de los agroquímicos.The present document includes the whole current and available scientific technical knowledge regarding to the agrichemical applications next to the rural-urban and urban zones, considering the several factors that contribute to an efficient and effective agricultural work, suggesting practices and establishing distances in favour of the population's security and of the Good Agricultural Practices. Concluding in a picture of suggestions based on the acute toxicity of the agrichemicals.

  9. Magnetic interactions and spin configuration in FeRh and Fe/FeRh systems

    Energy Technology Data Exchange (ETDEWEB)

    Kuncser, V. E-mail: kuncser@alpha2.infim.ro; Keune, W.; Sahoo, B.; Duman, E.; Acet, M.; Radu, F.; Valeanu, M.; Crisan, O.; Filoti, G

    2004-05-01

    The magnetic interactions and the Fe spin structure have been studied in Fe(6 nm)/FeRh systems by magnetometry, magneto-optic Kerr effect and conversion electron Moessbauer spectroscopy. A spin-flop coupling mechanism, with the interfacial spins of the ferromagnetic phase perpendicular to the spins of the antiferromagnetic phase was experimentally proved.

  10. Trabalho em saúde mental: vivências dos profissionais diante dos resultados

    Directory of Open Access Journals (Sweden)

    Vinicius Carvalho de Vasconcellos

    2012-12-01

    Full Text Available Considerando o cenário de consolidação da reforma psiquiátrica brasileira, este artigo investigou, no contexto dos trabalhadores da saúde mental, representações relativas ao papel profissional, às vivências diante dos resultados da assistência e às expectativas do futuro profissional da Saúde, tratando igualmente da possível ligação entre esses elementos. O material empírico foi coletado por meio de oito entrevistas semiestruturadas, realizadas em um Centro de Atenção Psicossocial brasileiro, e analisado principalmente pelo referencial teórico da psicossociologia francesa. De modo geral, os resultados sugerem que a vivência de realização diante dos resultados do trabalho vincula-se ao cumprimento do papel profissional, indicando também a ligação entre esses últimos elementos e as expectativas do futuro profissional. Na discussão e nas considerações finais, ressalta-se a concepção do trabalho por meio de seus limites intrínsecos como mecanismo que atenua a frustração profissional e analisam-se as implicações das vivências relativas aos resultados no vínculo subjetivo dos profissionais com o trabalho.

  11. PERFIL DO COMPORTAMENTO GERENCIAL: UM ESTUDO DE CASO DOS DIRETORES DOS CENTROS DE ENSINO DA UFSM

    Directory of Open Access Journals (Sweden)

    Daniela Huppes

    2009-12-01

    Full Text Available Com o aumento das pesquisas acerca de como deve ser um líder capaz de levar sua organização para níveis mais altos de eficiência, o presente trabalho objetiva identificar o perfil de comportamento gerencial, de acordo com o modelo proposto por Yukl (1998, dos Diretores de Centro da Universidade Federal de Santa Maria (UFSM. Utilizando a metodologia qualitativa, de caráter descritivo, a pesquisa foi realizada através de entrevistas semi-estruturadas, aplicadas a cada um dos oito Diretores dos Centros de Ensino. A análise dos dados foi realizada pela análise de conteúdo. Os resultados demonstram um perfil gerencial desses Diretores muito ligado ao gerenciamento de tarefas, devido à estrutura burocrática da própria instituição. Assim, atividades como planejar, solucionar problemas, administrar conflitos e esclarecer papéis e objetivos, atendidos pela exigência da universidade, e atividades relacionadas a formas de administrar relações, como monitorar desempenho, acaba negligenciado.

  12. ACERCA DOS PROCESSOS DE INDIGENIZAÇÃO DOS MUSEUS: UMA ANÁLISE COMPARATIVA

    Directory of Open Access Journals (Sweden)

    Andrea Roca

    2015-04-01

    Full Text Available A partir de uma leitura comparativa sobre a agência indígena no Museu Magüta (primeiro museu indígena do Brasil, pertencente ao povo Ticuna, localizado em Benjamin Constant, Amazonas e nas mostras do povo Musqueam no Museu de Antropologia da University of British Columbia (pioneiro na implementação do trabalho colaborativo com os povos indígenas, localizado em Vancouver, Canadá, este trabalho aborda modalidades coexistentes da chamada indigenização dos museus. Interessa-me distinguir as epistemologias e as políticas envolvidas na construção dos conteúdos indígenas desses espaços e sua autorrepresentação, problematizando a expressão "indigenização dos museus" e refletindo, ao mesmo tempo, sobre aquilo que se reconstrói, em termos dos cenários museológicos, após as situações coloniais

  13. De dragones, cascos y soldados de fortuna en el Occidente Antiguo. acerca de dos obras recientes sobre el mercenariado galo e hispano

    Directory of Open Access Journals (Sweden)

    García Jiménez, Gustavo

    2015-12-01

    Full Text Available Research on ancient mercenaries is fraught with problems, being the match between the scarce and partial data provided by the literary sources and the archaeological record a tricky and difficult matter. The recent publication of two books dealing with Iberian and Celtic mercenaries, by Raimon Graells and Luc Baray respectively, offers us an opportunity to dwell on a pervading discussion when studying cultural and military dynamics, and long distance relationships in Ancient Western Europe.La actividad mercenaria en la Antigüedad es uno de los campos de estudio más complejos de la investigación histórica, en buena medida debido a la difícil combinación que existe entre los siempre parciales datos de las fuentes literarias y la arqueología. La reciente publicación de dos monografías dedicadas al mercenario ibérico y celta, a cargo respectivamente de Raimon Graells y Luc Baray, nos brinda una magnífica oportunidad para retomar una vieja discusión siempre latente en el estudio de las dinámicas bélicas y culturales, y que nos permite ahondar en las intrincadas relaciones a larga distancia en el Occidente europeo antiguo.

  14. Evaluación de la exposición ambiental a plaguicidas orgánicos persistentes en dos barrios de la provincia de Córdoba

    Directory of Open Access Journals (Sweden)

    Patricia Lucero

    2008-12-01

    Full Text Available Se determinó la concentración de plaguicidas organoclorados en 167 muestras de sangre entera de habitantes de dos barrios (Sitio Nº 1 y Sitio Nº 2 de la provincia de Córdoba ubicados en los alrededores de depósitos de plaguicidas obsoletos. La presencia de plaguicidas se determinó por cromatografía gaseosa con detector de captura electrónica utilizando columnas capilares de distinta polaridad. Los plaguicidas más frecuentemente encontrados fueron p,p'-DDE, β-HCH y HCB. La máxima concentración detectada fue 7,31 µg/l y correspondió a p,p'-DDE. El β-HCH mostró valores más altos que los otros isómeros en la familia de los hexaclorociclohexanos (HCH. Se observó buena correlación entre la concentración de p,p'-DDE y la edad tal como se esperaba para un contaminante persistente y bioacumulable. El trabajo aporta información sobre los niveles de plaguicidas organoclorados en sangre en una población con exposición ambiental estudiada frente a denuncias periodísticas y de los mismos habitantes del lugar.

  15. Contabilidade criativa e responsabilidade dos auditores

    Directory of Open Access Journals (Sweden)

    Ariovaldo dos Santos

    2003-08-01

    Full Text Available Nos contextos nacional e internacional da profissão contábil, o auditor tem exercido um papel fundamental. A atividade profissional do auditor independente tem ajudado a impulsionar o desenvolvimento dos mercados, além de contribuir para o estabelecimento da ordem socioeconômica mundial. Na visão dos usuários externos da informação contábil, e dos próprios clientes, a atuação do auditor é sinônimo de confiança e credibilidade. Nos últimos meses, a onda de escândalos contábeis, com grandes empresas de auditoria envolvidas, e até sentenciadas (no caso Enron, a Andersen foi considerada culpada, por um Júri de Houston - Texas, pela destruição de documentos, marcou a atividade profissional dos auditores e parece ter mudado a visão de responsabilidade desses profissionais sobre esses fatos. No presente artigo são estudados e apresentados alguns conceitos fundamentais relacionados com o fenômeno da contabilidade criativa, assim como os fatores que induzem sua utilização, dentre os quais pode-se destacar: valores éticos, morais e vácuos ou flexibilidade normativa. Tais fatores acabam por funcionar como catalisadores da engenharia contábil no desenho das demonstrações contábeis e passam a atender os interesses de quem as elabora em vez de buscar a imagem fidedigna do patrimônio.In the national and international contexts of professional accounting, the auditor has played a fundamental role. The professional activity of the independent auditor has both helped to encourage market development and contributed to the establishment of a global socio-economic order.From the point of view of the external users of accounting information and the clients themselves, the professional activity of the auditor is a synonym of trust and credibility. In the last few months, the wave of financial scandals involving large auditing companies, some of which were even convicted for their demonstrated - direct and indirect - intervention in

  16. Panorama dos cursos de agroecologia no Brasil.

    OpenAIRE

    Balla, João Vitor Quintas; Massukado, Luciana Miyoko; Pimentel, Vania Costa

    2014-01-01

    Os cursos de agroecologia têm crescido nos últimos anos e sua introdução nas instituições de ensino se deu, em especial, a partir dos anos 2000. Desde então, diversos cursos são criados anualmente. No entanto, são poucos e dispersos os estudos que realizam uma análise quantitativa sistematizada sobre o ensino da agroecologia no Brasil. O objetivo deste estudo foi identificar os cursos em agroecologia, no âmbito da educação formal, que estão em funcionamento no Brasil, por região geográfica e ...

  17. La larga vida de dos rocas orensanas

    Directory of Open Access Journals (Sweden)

    García Quintela, Marco V.

    2011-12-01

    Full Text Available We study two rocks, a rock carving and a «rocky sanctuary » from the Ourense province (Spain, with two complementary methodologies, landscape archeology and «biography» (Kopytoff of objects. We start with their description in Christian texts, and then we observe that their relation with important hillforts forms a localization pattern, and finally we propose to date that relationship in the Iron Age. This chronology of the rocks and the following Christian reevaluation leads towards their «social life». These analyses are pertinent in the current debate about the chronology of the Galician rock art, and we propose that the use and meaning in the long term is as important as the initial moment of the carving.Se estudian dos rocas, un petroglifo y un «santuario rupestre » de la provincia de Ourense, con dos metodologías complementarias, la arqueología del paisaje y la «biografía» (Kopytoff de los objetos. Partiendo de su descripción en textos cristianos se considera el patrón de localización que conforman en relación con castros importantes, relación que se propone fechar en la Edad del Hierro. Esta adscripción cronocultural y su posterior resemantización cristiana lleva a la consideración de su «vida social». Estas aproximaciones inciden en el debate sobre la datación del arte rupestre en Galicia y se propone que, más allá del momento de grabado inicial, se estudie su uso y sentido en la larga duración.

  18. Experimental and theoretical studies of vibrational density of states in Fe3O4 single-crystalline thin films

    NARCIS (Netherlands)

    Handke, B; Kozlowski, A; Parlinski, K; Przewoznik, J; Slezak, T; Chumakov, AI; Niesen, L; Kakol, Z; Korecki, J

    2005-01-01

    This paper presents experimental and theoretical studies of lattice vibrations in a single-crystalline Fe3O4(001) thin film. The investigations were carried out in order to see how the lattice dynamics changes at the Verwey transition. Vibrational densities of states (DOS) were obtained from nuclear

  19. Caracterización de propóleos provenientes del municipio de Caldas obtenido por dos métodos de recolección

    Directory of Open Access Journals (Sweden)

    Julián Martínez G.

    2012-04-01

    Full Text Available Objetivo. Determinar las características fisicoquímicas y la actividad antimicrobiana de propóleos de Apis mellifera, provenientes del municipio de Caldas, obtenidos por dos métodos de recolección. Materiales y métodos. Se utilizaron dos métodos de recolección: de raspado y trampa plastica. Se estableció el contenido de cera, ceniza, material insoluble y resina de los propóleos crudos. Al extracto etanólico de los propóleos se les determinó el perfil cromatográfico (GC-MS y el espectro UV; además, se evaluó la actividad antimicrobiana in vitro frente a hongos (Aspergillus sp., Penicillium sp., Colletotrichum acutatum y C. gloesporioides, y bacterias (Salmonella tiphy, Bacillus subtilis, Staphylococcus aureus y Escherichia coli. Resultados. El material obtenido mediante malla matrizada presentó un perfil químico amplio, buena actividad antimicrobiana y mejores parámetros de calidad, de acuerdo con estándares establecidos por normas internacionales que los propóleos obtenidos por el método de raspado. Además, pudo observarse que la acción antimicrobiana de los propóleos fue dependiente de la concentración del extracto y del hongo o bacteria evaluada. Conclusiones. La composición química y la actividad antibacteriana y antifúngica de los propóleos están relacionadas con el método de recolección. El presente estudio aporta información para la selección de la técnica de cosecha del propóleo de acuerdo con la aplicación que se desee dar.

  20. Adherence to the Clinical Good Practical Guide of Bronchial Asthma in the Allergy Consultation Adherencia a la guía de buenas prácticas clínicas de asma bronquial en consulta de alergia

    Directory of Open Access Journals (Sweden)

    Rosa Naranjo Revollido

    2007-01-01

    Full Text Available

    Background: Bronchial asthma constitutes a high prevalence disease which gets the 10 % of our milieu. That’s why it is very important to assess its clinical management. The clinical good practice guide constitutes a group of orientations which outline the medical assistance based on what is considered as the best options for treatment and diagnosis. Objective: to determine the adherence of the medical personnel specialized on the clinical good practical guide in the diagnosis and treatment of intercrisis bronchial asthma in ambulatory patients. Methods: A descriptive study was performed at the University Hospital ¨Dr. Gustavo Aldereguía Lima¨ in Cienfuegos city where 300 clinical records of allergic patients attending consultation during November 2001 to December 2005 were assessed. The questionnaire was applied to verify the level of general and partial fulfilment of the guide. Results: The main errors detected in the partial adherence were: Not to evaluate the asthmatic patient according to the criteria of high risk (90 % of partial adherence and lack of assessment of the patients of asthmatic high risk in the multidisciplinary consultation in which only the 70 % is adherenced to the guide. Conclusions: The general adherence to the guide was of 100% with highly significant results and a satisfactory evaluation.

    Fundamento: El asma bronquial constituye una enfermedad de alta prevalencia que alcanza alrededor del 10 % en nuestro medio, por lo que es muy importante evaluar su manejo clínico. Las guías de buenas prácticas clínicas constituyen un conjunto de orientaciones que pautan la atención médica, basadas en lo que se considera como las mejores opciones de diagnóstico y tratamiento. Objetivo: Determinar la adherencia del personal médico especializado a la guía de buenas prácticas clínicas en el diagn

  1. El cuidado a la salud bucal del anciano: buenas prácticas fundamentadas en el paradigma de la promoción de la salud Oral health care of the aged: good practices based on health promotion paradigm

    Directory of Open Access Journals (Sweden)

    Ana Lúcia Schaefer Ferreira de Mello

    2009-06-01

    Full Text Available Presenta la elaboración de un referente de buenas prácticas del cuidado a la salud bucal a la población anciana, basado en la Promoción de la Salud (PS. El método adoptado fue el de la Teoría Fundamentada en los Datos. El referencial teórico-práctico se describe para guiar el desarrollo de acciones en consonancia con el paradigma de la PS según la Carta de Ottawa y sus cinco áreas. Es necesario considerar estas prácticas de cuidado como un objetivo a alcanzar y contribuir al progreso sostenido en la calidad del cuidado y la transformación en las condiciones de salud bucal durante el curso de la vida.It presents the elaboration of a theoretical-practical referential of good oral health care practices to the aged population, based on the principles of Health Promotion (HP. The methodological referential adopted was Grounded Theory. The theoretical-practical referential is described to guide the development of oral health care actions to the aged, in consonance with the HP paradigm defended in the Ottawa Charter according to five areas. It is necessary to consider these care practices, that conform the theoretical-practical referential here detailed, as an objective to reach, to contribute to the sustained progress in the quality of the care and, consequently, promote a transformation in oral health conditions during life course.

  2. Guía de buenas prácticas en Atención Primaria con perspectiva de género Best practices guide in Primary Care with a gender perspective

    Directory of Open Access Journals (Sweden)

    Eva Piqué Prado

    2011-12-01

    Full Text Available El artículo presenta una guía de buenas prácticas para contribuir desde la equidad de género a mejorar las condiciones de salud y procesos de atención de salud en Atención Primaria. Se centra en las siguientes prácticas: (1 Trabajar la promoción de salud de las mujeres en todas las etapas del ciclo vital a través de la educación para la salud grupal. (2 Fomento de la corresponsabilidad en el cuidado de las personas dependientes. (3 Promoción del ejercicio físico en mujeres. (4 Promoción de hábitos alimentarios saludables y prevención de enfermedades prevalentes relacionadas con la alimentación. (5 Prevención y detección de la violencia de género. (6 Utilización de un discurso sanitario no sexista ni androcéntrico.The article presents a practical guide to help from gender equity to improve health conditions and health care processes in primary care. It focuses on the following practices: (1 Working to promote women's health in all stages of life through health education group. (2 Promotion of shared responsibility in the care of dependents. (3 Promotion of physical activity in women. (4 Promotion of healthy eating habits and prevention of prevalent diseases related to food. (5 Prevention and detection of gender violence. (6 Use of a sanitary speech not sexist or androcentric.

  3. Dos sentencias distantes y una convención verdadera

    OpenAIRE

    Domenech, Ernesto E.

    2014-01-01

    He aquí dos sentencias, de dos países distintos (Colombia y Argentina), de dos infancias discernibles (una sin padres ni familia al alcance, otra con padres en conflicto y con facebook) de niños y jóvenes de edades diversas (uno de 4 años, otro adolescente). He aquí también dos fueros disímiles (uno penal, el otro civil), con distintos derechos internos y una misma Convención Internacional de Derechos del Niño. La diversidad y la comparación inquietan. El lenguaje claro de las sentencias a...

  4. Liderando mejoras de calidad mediante el desarrollo, implementación, y medición de las guías de buenas prácticas de Enfermería / Leading Quality Improvement through Best Practice Guideline Development, Implementation, and Measurement Science / Liderando com melhor qualidade por meio da elaboração, implementação e avaliação de guias de boas práticas na enfermagem

    Directory of Open Access Journals (Sweden)

    Irmajean Bajnok, RN., MScN., PhD.

    2015-03-01

    Full Text Available Introducción: La búsqueda de prácticas basadas en la evidencia ha estimulado acciones por parte de un número de grupos a nivel mundial para desarrollar herramientas de conocimiento. Sin embargo, la absorción de conocimiento y la implementación de guías de práctica clínica en cualquier ambiente clínico requieren más que la concientización y distribución de guías desarrolladas rigurosamente. Objetivo: El objetivo de este artículo es compartir la implementación de estrategias exitosas desarrolladas por el Programa de Guías de Buenas Practicas en Enfermería de la Asociación de Enfermeras Profesionales de Ontario (RNAO, por sus siglas en ingles, la cual asegura que sus practicantes estén completamente consientes del mejor conocimiento disponible y que tengan el adecuado soporte para transferir las recomendaciones de guías de buenas prácticas clínicas a su práctica diaria. Temas de reflexión: Los detalles del proceso de siete etapas de la RNAO de desarrollo de la guía y el Programa de Directrices sobre las Mejores Prácticas de la RNAO son proporcionadas y resaltadas como estrategias de implementación que permite a las organizaciones asociarse con la RNAO para implementar múltiples guías de buenas prácticas usando un método sistemático planeado y una activa participación del personal, con énfasis en mejoras de calidad y evaluación. El Programa de Directrices sobre las Mejores Prácticas es informado por la ciencia de implementación y esta rápidamente ganando aclamación internacional por su eficiencia en crear altos niveles de cuidado de enfermería y calidad en el cuidado que las instituciones sanitarias ofrecen, así como mejoramiento y mejores resultados en las practicas basadas en la evidencia. Conclusiones: A través de su labor de liderazgo en el desarrollo, la implementación y la evaluación rigurosa de las guías, la RNAO esta exitosamente transformando las prácticas de enfermería mediante el

  5. Reductive biotransformation of Fe in shale limestone saprolite containing Fe(III) oxides and Fe(II)/Fe(III) phyllosilicates

    Science.gov (United States)

    Kukkadapu, Ravi K.; Zachara, John M.; Fredrickson, James K.; McKinley, James P.; Kennedy, David W.; Smith, Steven C.; Dong, Hailiang

    2006-07-01

    A influenced by AQDS. Biogenic Fe(II) resulting from phyllosilicate Fe(III) reduction remained in a layer-silicate environment that displayed enhanced solubility in weak acid. The mineralogic nature of the goethite biotransformation product was not determined. Chemical and cryogenic Mössbauer measurements, however, indicated that the transformation product was not siderite, green rust, magnetite, Fe(OH) 2, or Fe(II) adsorbed on phyllosilicate or bacterial surfaces. Several lines of evidence suggested that biogenic Fe(II) existed as surface associated phase on the residual goethite, and/or as a Fe(II)-Al coprecipitate. Sediment aggregation and mineral physical and/or chemical factors were demonstrated to play a major role on the nature and location of the biotransformation reaction and its products.

  6. Missing Fe: hydrogenated iron nanoparticles

    CERN Document Server

    Bilalbegovic, G; Mohacek-Grosev, V

    2016-01-01

    Although it was found that the FeH lines exist in the spectra of some stars, none of the spectral features in the ISM have been assigned to this molecule. We suggest that iron atoms interact with hydrogen and produce Fe-H nanoparticles which sometimes contain many H atoms. We calculate infrared spectra of hydrogenated iron nanoparticles using density functional theory methods and find broad, overlapping bands. Desorption of H2 could induce spinning of these small Fe-H dust grains. Some of hydrogenated iron nanoparticles posses magnetic and electric moments and should interact with electromagnetic fields in the ISM. Fe_nH_m nanoparticles could contribute to the polarization of the ISM and the anomalous microwave emission. We discuss the conditions required to form FeH and Fe_nH_m in the ISM.

  7. Aplicações da teoria dos sistemas à teoria dos códigos

    OpenAIRE

    Rodrigues, Duarte Polónia

    2012-01-01

    Os códigos the Reed Solomon são códigos cíclicos não binários com símbolos de código num corpo de Galois. Eles foram descobertos em 1960 por L. Reed e G. Solomon. Nas décadas após a sua descoberta, os códigos de RS gozaram de inúmeras aplicações. Este trabalho é maioritariamente focado nos algoritmos de codi cação e descodi cação dos códigos RS, analisando uma relação entre a teoria dos códigos e uma técnica de identi cação desenvolvida no âmbito da abordagem comportamental...

  8. A sociedade dos povos como solução dos conflitos internacionais

    Directory of Open Access Journals (Sweden)

    Guilherme Pinto Ravazi

    2015-06-01

    Full Text Available RESUMO O objetivo deste artigo é estabelecer o estado de coisas do problema dos conflitos internacionais. Em seguida, apresentar o projeto iluminista de Kant n’A Paz Perpétua que propõe uma série de princípios para o estabelecimento de uma Federação da Paz. Por fim, expor o projeto de Rawls no Direito dos Povos como uma solução para os conflitos internacionais. ABSTRACT The aim of this paper is to discribe the state of affairs of the issue of international conflicts. Then I present Kant’s Enlightenment project in Perpetual Peace, which proposes a series of principles for the establishment of a pacific federation. Finally, I present Rawls’ project in The Law of Peoples as a solution to international conflicts.

  9. Neurobiologia dos transtornos do controle dos impulsos The neurobiology of impulse control disorders

    Directory of Open Access Journals (Sweden)

    Wendol A Williams

    2008-05-01

    Full Text Available OBJETIVO: Revisar os artigos sobre substratos neurobiológicos dos transtornos do controle dos impulsos. O jogo patológico é o foco central desta revisão na medida em que a maioria dos estudos biológicos dos formalmente classificados como transtornos do controle dos impulsos examinou este transtorno. MÉTODO: Foi feita uma busca no banco de dados Medline de artigos publicados de 1966 até o presente para identificar aqueles relevantes para serem revisados neste artigo. DESFECHOS: Estudos pré-clínicos sugerem que a neuromodulação das monoaminas cerebrais está associada à tomada de decisões impulsivas e aos comportamentos de risco. Os estudos clínicos implicam diversos sistemas de neurotransmissores (serotoninérgico, dopaminérgico, adrenérgico e opióide na fisiopatologia do jogo patológico e de outros transtornos do controle dos impulsos. Estudos de neuroimagem preliminares têm indicado o córtex pré-frontal ventromedial e o estriato ventral como atuantes na fisiopatologia do jogo patológico e de outros transtornos do controle dos impulsos. As contribuições genéticas para o jogo patológico parecem substanciais e os estudos iniciais têm relacionado esse transtorno a polimorfismos alélicos específicos, ainda que os achados de varredura genômica ainda tenham que ser publicados. CONCLUSÃO: Mesmo que tenham sido logrados avanços significativos em nossa compreensão sobre os transtornos do controle dos impulsos, mais pesquisas são necessárias para ampliar o conhecimento existente e traduzir esses achados em avanços clínicos.OBJECTIVE: To review the neurobiological substrates of impulse control disorders. Pathological gambling is a main focus of the review in that most biological studies of the formal impulse control disorders have examined this disorder. METHOD: The medical database Medline from 1966 to present was searched to identify relevant articles that were subsequently reviewed to generate this manuscript

  10. Comparación de las prácticas de cuidado en dos grupos de gestantes en la ciudad de Sincelejo

    Directory of Open Access Journals (Sweden)

    LUZ MARINA GARCÍA GARCÍA

    2008-07-01

    Full Text Available Para comparar las prácticas de cuidado que realizan consigo mismas y con su hijo por nacer un grupo de gestantes adolescentes y otro grupo de gestantes adultas que asisten a control prenatal en Sincelejo, durante los meses de julio y septiembre de 2006, se desarrolló un estudio descriptivo, cuantitativo y transversal, con una muestra de 97 gestantes adolescentes entre 15 y 19 años y de 153 gestantes adultas entre 20 y 45 años, sin patologías asociadas, a quienes se les aplicó un instrumento sobre prácticas de cuidado, validado por la Universidad Nacional de Colombia, sede Bogotá. Estas prácticas se clasificaron en buenas, regulares y malas, en los dos grupos, para establecer la comparación cuantitativa de las mismas. Los principales resultados fueron: diferencias estadísticamente significativas en las dimensiones de estimulación prenatal, higiene y cuidados personales, alimentación y sustancias no beneficiosas; en estas cuatro dimensiones el resultado de buenas prácticas fue más favorable para las gestantes adultas; no se encontró diferencia significativa en las dimensiones de ejercicio y descanso, y sistemas de apoyo. La mayoría de las gestantes adultas (81,7% realizaban actividades domésticas que les producían cansancio; 23,53% no desarrollaban actividades recreativas; 25,77% de las gestantes adolescentes y 41,18% de las gestantes adultas consumían lácteos. 19,59% de las gestantes adolescentes y 6,54% de las adultas no evitaban el consumo de licor y 4,12% de las gestantes adolescentesy0,65% de lasgestantes adultas habían consumido sustancias psicoactivas. Tanto adolescentes (68,04% como adultas (52,29% realizaban prácticas de estimulación prenatal catalogadas como regulares. Solo 31,37% de las gestantes adultas y 21,65% de las gestantes adolescentes tenían prácticas adecuadas de estimulación prenatal.

  11. [FeFe]-hydrogenase oxygen inactivation is initiated at the H cluster 2Fe subcluster.

    Science.gov (United States)

    Swanson, Kevin D; Ratzloff, Michael W; Mulder, David W; Artz, Jacob H; Ghose, Shourjo; Hoffman, Andrew; White, Spencer; Zadvornyy, Oleg A; Broderick, Joan B; Bothner, Brian; King, Paul W; Peters, John W

    2015-02-11

    The [FeFe]-hydrogenase catalytic site H cluster is a complex iron sulfur cofactor that is sensitive to oxygen (O2). The O2 sensitivity is a significant barrier for production of hydrogen as an energy source in water-splitting, oxygenic systems. Oxygen reacts directly with the H cluster, which results in rapid enzyme inactivation and eventual degradation. To investigate the progression of O2-dependent [FeFe]-hydrogenase inactivation and the process of H cluster degradation, the highly O2-sensitive [FeFe]-hydrogenase HydA1 from the green algae Chlamydomonas reinhardtii was exposed to defined concentrations of O2 while monitoring the loss of activity and accompanying changes in H cluster spectroscopic properties. The results indicate that H cluster degradation proceeds through a series of reactions, the extent of which depend on the initial enzyme reduction/oxidation state. The degradation process begins with O2 interacting and reacting with the 2Fe subcluster, leading to degradation of the 2Fe subcluster and leaving an inactive [4Fe-4S] subcluster state. This final inactive degradation product could be reactivated in vitro by incubation with 2Fe subcluster maturation machinery, specifically HydF(EG), which was observed by recovery of enzyme activity. PMID:25579778

  12. O pensamento inaugural dos direitos humanos pelas lições dos sofistas

    Directory of Open Access Journals (Sweden)

    Hilda Helena Soares Bentes

    2009-12-01

    Full Text Available Propõe-se a analisar as primeiras manifestações de um pensamento  igualitário, base   dos direitos do homem na filosofia jurídica moderna, através do debate travado entre as concepções de phýsis e nómos, iniciado pelos pré-socráticos e desenvolvido intensamente pelos sofistas.

  13. Procesado y caracterización de aleaciones Fe-Al

    OpenAIRE

    Montserrat Quevedo, Antoni

    2005-01-01

    Las aleaciones de Fe-Al forman intermetálicos que son una rama de las aleaciones que consiste en dos o mas metales, como por ejemplo Fe2-Al5. Los materiales intermetálicos son fases o compuestos con relaciones atómicas bien definidas con un intervalo muy limitado de composiciones posibles. Poseen una estructura cristalográfica con orden de largo alcance que puede mantenerse hasta la temperatura de fusión o puede desordenarse a una temperatura característica más baja. Esta estru...

  14. Universidade e comunidade na perspectiva dos movimentos estudantis dos anos 1960

    Directory of Open Access Journals (Sweden)

    Luís Antonio Groppo

    2011-03-01

    Full Text Available Resumo Neste artigo, procuro discutir a práxis dos movimentos estudantis universitários dos anos 1960em relação às "comunidades" no entorno das unidades de ensino. Constata-se, primeiro, uma relativa carência de ações efetivas, principalmente porque os movimentos estudantis se preocupavam, sobretudo, com a intervenção na política nacional e nos rumos gerais da sociedade de que faziam parte. Ainda assim, na sua riqueza e complexidade, os movimentos estudantis dos anos 1960 enfrentaram a questão da relação com a "comunidade", o que se observa em projetos e propostas criativas de ação prática, revelando uma potencialidade que poderia ter sido mais bem aproveitada. Palavras-chave: movimentos estudantis; universidade; comunidade.   Abstract In this article I intend to discuss the praxis from student movements of sixties, in its relations with the "communities" in the universities ‘neighborhoods. I evidence, first, a relative failure of effective actions, principally because the student movements preoccupy, especially, with the intervention in national politic and in the general ways of their societies. Indeed, in their wealth and complexity, the student movements from the sixties confront the question of the relation with the community, what it looks in creative projects and propositions of practical action, what reveals a potentiality what can be better used. Keywords: student movements; university; community.

  15. A exploração sustentada dos recursos naturais no Arquipélago dos Bijagós

    OpenAIRE

    João MADEIRA

    2011-01-01

    Considera-se pertinente este estudo sobre a exploração sustentada dos recursos naturais no Arquipélago dos Bijagós, dada a sua localização estratégica na geografia atlântica e a sua vulnerabilidade às influências externas que afectam o seu equilíbrio secular. Desde 1975 a sociedade guineense tem sido responsável pela utilização descontrolada dos recursos naturais, sobretudo na zona costeira. O Arquipélago tem suscitado numerosos interesses, muitos dos quais incompatíveis com a garantia de um ...

  16. Dois estudos sobre o trabalho dos petroleiros

    Directory of Open Access Journals (Sweden)

    Leda Leal Ferreira

    1996-06-01

    Full Text Available O presente artigo traz um resumo de dois estudos realizados na área do petróleo, o primeiro feito em uma unidade de refino e o segundo abarcando o trabalho de operadores exercendo várias funções dentro de uma refinaria e de terminais marítimos de petróleo. Nos dois casos, o ponto central foi a análise da atividade dos trabalhadores, isto é, o que eles faziam e como o faziam para dai conta das exigências de produção que lhes eram atribuídas. No entanto, os métodos utilizados foram diferentes: no primeiro caso utilizou-se a Análise Ergonômica do Trabalho (AET e no segundo, a Análise Coletiva do Trabalho (ACT. Além de apresentar os principais resultados destes estudos, a autora faz considerações sobre as diferenças entre os dois métodos e um apelo à comunidade científica para que se preocupe mais em estudar a atividade real dos trabalhadores e assim contribuir para um melhor conhecimento do que se passa no interior das unidades produtivas, evitando que sofrimentos humanos inúteis e até catástrofes industriais continuem a ocorrer.This paper describes two studies about petroleum industry. The first was developed in a refinery and the second focuses on the work of operators in various jobs within a refinery and maritime petroleum units. In both cases, the focal point was the analyses of activities, that is, what the workers do and how they do it in order to meet production demandai put on them. However, two different methods were applied in the studies. Ergonomics Work Analyses (EWA was used on the first case and Collective Work Analyses (CWA, on the second. Besides showing the main results, the author compares the two methods. She also draws the scientific community attention to the importance of studding the workers actual activity in order to contribute to a better understanding of what is going on inside production units, avoiding useless human suffering, and the still ocurring undustrial disasters.

  17. Biomimetic assembly and activation of [FeFe]-hydrogenases.

    Science.gov (United States)

    Berggren, G; Adamska, A; Lambertz, C; Simmons, T R; Esselborn, J; Atta, M; Gambarelli, S; Mouesca, J-M; Reijerse, E; Lubitz, W; Happe, T; Artero, V; Fontecave, M

    2013-07-01

    Hydrogenases are the most active molecular catalysts for hydrogen production and uptake, and could therefore facilitate the development of new types of fuel cell. In [FeFe]-hydrogenases, catalysis takes place at a unique di-iron centre (the [2Fe] subsite), which contains a bridging dithiolate ligand, three CO ligands and two CN(-) ligands. Through a complex multienzymatic biosynthetic process, this [2Fe] subsite is first assembled on a maturation enzyme, HydF, and then delivered to the apo-hydrogenase for activation. Synthetic chemistry has been used to prepare remarkably similar mimics of that subsite, but it has failed to reproduce the natural enzymatic activities thus far. Here we show that three synthetic mimics (containing different bridging dithiolate ligands) can be loaded onto bacterial Thermotoga maritima HydF and then transferred to apo-HydA1, one of the hydrogenases of Chlamydomonas reinhardtii algae. Full activation of HydA1 was achieved only when using the HydF hybrid protein containing the mimic with an azadithiolate bridge, confirming the presence of this ligand in the active site of native [FeFe]-hydrogenases. This is an example of controlled metalloenzyme activation using the combination of a specific protein scaffold and active-site synthetic analogues. This simple methodology provides both new mechanistic and structural insight into hydrogenase maturation and a unique tool for producing recombinant wild-type and variant [FeFe]-hydrogenases, with no requirement for the complete maturation machinery. PMID:23803769

  18. Magnetic properties of Fe1-xMnx/Fe nanocomposites

    DEFF Research Database (Denmark)

    Anhøj, Thomas Aarøe; Jacobsen, Claus Schelde; Mørup, Steen

    2004-01-01

    We have prepared nanocomposites of mixtures of ferromagnetic alpha-Fe and antiferromagnetic gamma-Fe50Mn50 nanoparticles, and studied their magnetic and structural properties by magnetization measurements, Mössbauer spectroscopy, and x-ray diffraction. A sample consisting of a 1:1 mixture...

  19. Mecanosíntese do composto BiFeO3 Mechanosynthesis of the BiFeO3 compound

    Directory of Open Access Journals (Sweden)

    V. F. Freitas

    2008-09-01

    Full Text Available Os compostos cerâmicos BiFeO3 puro e modificado (Bi0,95R0,05FeO3, com terras raras R = Gd ou Eu, foram sintetizados por moagem em altas energias. As amostras foram analisadas por difração de raios X, microscopia eletrônica de varredura e espectroscopia por energia dispersiva de raios X. A difração de raios X indicou que as amostras modificadas com Eu são monofásicas, enquanto que as amostras puras e modificadas com Gd apresentaram majoritariamente a fase BiFeO3, com uma pequena quantidade de outras fases. A espectroscopia por energia dispersiva de raios X revelou a presença dos átomos modificantes na amostra e o mapeamento destes átomos indicou uma distribuição homogênea deles em toda a amostra. A microscopia eletrônica de varredura mostrou uma significante diminuição no tamanho das partículas, estando estas com dimensões sub-micrométricas e com diâmetro médio em torno de 500 nm. Estudos de densificação dos corpos cerâmicos indicaram compostos altamente densos, com densidades relativas acima de 0,9 sendo que o composto modificado com Eu alcançou a densidade relativa ρ/ρ0 = 0,98.The, pure and rare earth modified (Bi0.95R0.05FeO3 / R = Gd or Eu BiFeO3 compounds were synthesized by high-energy ball milling. The samples were analyzed by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The X-ray diffraction results indicated single phase Eu modified samples, while the pure and Gd modified ones presented the BiFeO3 as majority phase, and small amount of the spurious phase. The energy dispersive spectroscopy revealed the presence of the modifiers atoms in the sample and the mapping of these atoms indicated the homogeneous distribution of them in the whole samples. The scanning electron microscopy showed a decrease significant on the particle size, with medium diameter around 500 nm. Densification studies indicated high-dense ceramics body, with relative density above of 0.9, were Eu

  20. Chemistry related to the actives sites of the [Fe]- and [FeFe]-hydrogenases

    OpenAIRE

    Hill, Amanda D.

    2016-01-01

    Hydrogenases are an important group of enzymes found in a range of microorganisms. There are three phylogenetically distinct classes of hydrogenase all of which feature iron-containing complexes. The work contained in this thesis has two main focuses: the synthesis and characterization of novel mimics of the [Fe]-hydrogenase active site, and spectroscopic studies on the interaction of iron-sulfur clusters with CO and CN− relevant to the biosynthesis of the H-cluster of [FeFe]-hydrogenase. ...

  1. Dos celebraciones religiosas en un mundo globalizado

    Directory of Open Access Journals (Sweden)

    María Iracheta

    2009-01-01

    Full Text Available Este artículo intenta responder a la pregunta ¿cómo permanecen dos fiestas religiosas mexicanas -la de la Nuestra Señora de Tonatico, en su Santuario, ubicado en el municipio de Tonatico, Estado de México y la de la Virgen del Rosario en su iglesia del Barrio de Xochimilco, -en la ciudad de Oaxaca, capital del Estado de Oaxaca, -en el contexto de la modernización y la globalización? Tres elementos ayudan a explicar esta permanencia: la tradición, que es asumida y reproducida por el "linaje de creyentes" pasados, presentes y futuros; el ritual, que reproduce la memoria histórica y la identidad local; y la apropiación de elementos culturales ajenos a la cultura local para sobrevivir en contextos globales. Estas celebraciones permiten restituir la armonía en los pueblos o barrios, que han cambiado drásticamente por la inserción de los mismos en un mercado mundial. También generan la percepción de tener el control de la comunidad frente a los grandes procesos externos que la amenazan: la mancha urbana, el comercio internacional, los medios masivos de comunicación, la cultura de masas, entre otros.

  2. Grupos de nudos con dos generadores

    Directory of Open Access Journals (Sweden)

    Christian Pommerenke

    2011-06-01

    Full Text Available Se estudian grupos de nudos que admiten una presentación con dos generadores y una relación. Decimos que una presentación �a, b | r� es palindrómica si r es una palabra palíndromo, es decir, r es una palabra que se lee lo mismo de adelante para atrás que de atrás para adelante. Estudiamos condiciones bajo las cuales es posible cambiar la presentación dada para obtener una presentación palindrómica. Probamos que si el grupo G de un nudo admite una representación fiel en un subgrupo discreto de SL(2, C, entonces G admite una presentación palindrómica. Abstract. We study knot groups that admit a presentation with two generators and one relation. We say that a presentation �a, b | r� is palindromic if r is a palindrome, that is, if r is a word that reads the same forwards and backwards. We study conditions that allow us to change the given presentation to obtain a palindromic presentation. We prove that if the knot group G admits a faithful discrete SL(2, C-representation then G admits a palindromic presentation.

  3. LAS DOS TRÍADAS DEBEJARANO

    Directory of Open Access Journals (Sweden)

    Jorge Iván González

    Full Text Available El artículo diseute "dos tríadas" que propone Bejarano para calificar a la teoría económica actual. La primera tríada tiene que ver con el realismo, la pertinencia y la relevancia de la teoría. Y la segunda tríada con sus dimensiones política, institucional y moral. El artículo centra la atención en esta segunda tríada, argumentando que la teoría no es apolítica, ainstitucional y amoral como afirma Bejarano. El examen crítico de la posición de Bejarano se sustenta en algunas de las tesis de: Walras, Marshall, Hicks, vickrey, Samuelson y Arrow.This article discusses the "two triads" that Bejarano has proposed in order to describe present economic theory. The first triad refers to the realism, pertinence and relevance of the theory. The second triad to its political, institutional and moral dimension. The article centers its attention on this second triad, arguing that the theory is not apolitical, uninstitutional and amoral as Bejarano states. The critical examination of Bejarano's proposition is supported on thesis of Walras, Marshall, Hicks, Vickrey, Samuelson and Arrow.

  4. Angiografia por tomografia computadorizada dos aneurismas intracranianos

    Directory of Open Access Journals (Sweden)

    Laureano Vinícius Santos

    2002-01-01

    Full Text Available Este trabalho foi realizado para avaliar os achados da angiografia por tomografia computadorizada, comparativamente à angiografia por subtração digital, em relação aos aneurismas intracranianos, e a possibilidade da maior utilização da angiografia por tomografia computadorizada no Brasil. Foram analisados oito pacientes que apresentavam um total de sete aneurismas não tratados e um aneurisma tratado. Houve subseqüente correlação com outros trabalhos publicados na literatura médica. Os exames foram realizados em uma clínica e em dois hospitais privados, na cidade do Rio de Janeiro, RJ. Foi demonstrada boa correlação entre os métodos estudados, em relação ao diagnóstico dos aneurismas, no acompanhamento e avaliação pré-terapêutica dessas lesões. A angiografia por tomografia computadorizada foi um exame menos invasivo, de menor custo e maior acessibilidade. Concluiu-se que a angiografia por tomografia computadorizada é um exame que deve ser utilizado com maior freqüência para avaliação nesta enfermidade.

  5. Del indicativo de la fe al imperativo de la ética

    Directory of Open Access Journals (Sweden)

    Tony Mifsud

    2012-01-01

    Full Text Available Después del Concilio Vaticano II, la reflexión de la Teología Moral abandona definitivamente un talante legalista a favor de un discurso enraizado en el horizonte bíblico de una respuesta humana a la llamada divina. Sin embargo, esta matriz bíblica no se entiende como una especie de "moral revelada", sino más bien como un ethos bíblico que da cuenta de una "realidad revelada" a la luz de la Buena Noticia y sus consecuencias en el estilo de vida de la comunidad de los discípulos. De esta manera, el indicativo de la fe se torna un imperativo ético.After the Second Vatican Council, the reflection of Moral Theology definitely abandons its legalistic spirit in favor of a discourse rooted in the biblical perspective of a human response to the divine call. However, this biblical matrix is not understood as a type of "revealed morality" but rather as a biblical ethos that accounts for a "revealed reality" in light of the Good News and its consequences on the lifestyle of the disciples' community. Thus, the indicative of faith becomes an ethical imperative.

  6. Structure and properties of nitrided binary Fe-Al, Fe-V, Fe-Ti alloys

    International Nuclear Information System (INIS)

    The structure of binary alloys Fe-Al (up to 6.85% Al), Fe-V (up to 1.86% V), and Fe-Ti (up to 1.26% Ti) nitrated for 1 hr at 500 deg C has been investigated. The forming of the nitrous phases in the diffusion layers corresponds to the Fe-N diagram. The surface layer consists of epsilon -/nitride of Fe3N, then follows the γ'-phase, and further a wide region of a nitrous α-solid solution. Separate crystals of Al2O3 have been found on the surface of nitrated Fe-Al alloys. The ferrite hardness is increased most efficiently by titanium, less noticeably by vanadium, and only slightly by aluminium. It has been established that the diffusion sublayer of the Fe-Ti and Fe-V alloys contains, in addition to the segregations of the excess γ'-phase, another nitride phase Fe16N2, which is isomorphous with the matrix. The matrix reflexes indicate the effect of diffusion scattering in the form of rods, which points to the formation of clusters or Guinier-Preston zones coherent or partly coherent with the matrix

  7. Superconductivity in Fe-chalcogenides

    Energy Technology Data Exchange (ETDEWEB)

    Chang, C.C.; Chen, T.K. [Institute of Physics, Academia Sinica, Taipei, Taiwan (China); Lee, W.C. [Department of Physics, Applied Physics, and Astronomy, Binghamton University – SUNY (United States); Lin, P.H. [National Synchrotron Research Center, Hsinchu, Taiwan (China); Wang, M.J. [Institute of Astrophysics and Astronomy, Academia Sinica, Taipei, Taiwan (China); Wen, Y.C. [Institute of Physics, Academia Sinica, Taipei, Taiwan (China); Wu, P.M. [Deparment of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA (United States); Wu, M.K., E-mail: mkwu@mail.ndhu.edu.tw [Institute of Physics, Academia Sinica, Taipei, Taiwan (China); National Donghwa University, Hualien, Taiwan (China)

    2015-07-15

    FeSe, which has the simplest crystal structure among the Fe based superconductors, and related chalcogenide superconductors are ideal candidates for investigating the detailed mechanism of the iron-based superconductors. Here, we summarize recent studies on the Fe-chalcogenides, with the goal to address some unresolved questions such as what is the influence of chemical stoichiometry on the phase diagram, what is the exact parent phase of FeSe system, and why can T{sub c}s be so dramatically enhanced in FeSe based superconductors? Recent developments in novel synthesis to prepare chalcogenide crystals, nano-materials and thin films allow the community to begin to address these issues. Then we review physical properties of the Fe chalcogenides, specifically focusing on optical properties, scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy (ARPES) results. These measurements along with recent theories provide a framework for better understanding the origin of superconductivity in FeSe and Fe-chalcogenides.

  8. Fractionation of Fe isotopes during Fe(II) oxidation by a marine photoferrotroph is controlled by the formation of organic Fe-complexes and colloidal Fe fractions

    Science.gov (United States)

    Swanner, Elizabeth D.; Wu, Wenfang; Schoenberg, Ronny; Byrne, James; Michel, F. Marc; Pan, Yongxin; Kappler, Andreas

    2015-09-01

    Much interest exists in finding mineralogical, organic, morphological, or isotopic biosignatures for Fe(II)-oxidizing bacteria (FeOB) that are retained in Fe-rich sediments, which could indicate the activity of these organisms in Fe-rich seawater, more common in the Precambrian Era. To date, the effort to establish a clear Fe isotopic signature in Fe minerals produced by Fe(II)-oxidizing metabolisms has been thwarted by the large kinetic fractionation incurred as freshly oxidized aqueous Fe(III) rapidly precipitates as Fe(III) (oxyhydr)oxide minerals at near neutral pH. The Fe(III) (oxyhydr)oxide minerals resulting from abiotic Fe(II) oxidation are isotopically heavy compared to the Fe(II) precursor and are not clearly distinguishable from minerals formed by FeOB isotopically. However, in marine hydrothermal systems and Fe(II)-rich springs the minerals formed are often isotopically lighter than expected considering the fraction of Fe(II) that has been oxidized and experimentally-determined fractionation factors. We measured the Fe isotopic composition of aqueous Fe (Feaq) and the final Fe mineral (Feppt) produced in batch experiment using the marine Fe(II)-oxidizing phototroph Rhodovulum iodosum. The δ56Feaq data are best described by a kinetic fractionation model, while the evolution of δ56Feppt appears to be controlled by a separate fractionation process. We propose that soluble Fe(III), and Fe(II) and Fe(III) extracted from the Feppt may act as intermediates between Fe(II) oxidation and Fe(III) precipitation. Based on 57Fe Mössbauer spectroscopy, extended X-ray absorption fine structure (EXAFS) spectroscopy, and X-ray total scattering, we suggests these Fe phases, collectively Fe(II/III)interm, may consist of organic-ligand bound, sorbed, and/or colloidal Fe(II) and Fe(III) mineral phases that are isotopically lighter than the final Fe(III) mineral product. Similar intermediate phases, formed in response to organic carbon produced by FeOB and inorganic

  9. Conteúdo de minerais dos ingredientes e da multimistura Mineral content of ingredients and multimixture

    Directory of Open Access Journals (Sweden)

    Celma de Oliveira Barbosa

    2006-12-01

    Full Text Available Os objetivos deste estudo foram determinar o conteúdo de minerais dos ingredientes e da multimistura, produzida e comercializada em Teresina-PI e avaliar a composição mineral da multimistura, relacionando-a com a ingestão diária recomendada (IDR. As amostras estudadas foram multimistura, pó da folha de macaxeira, farelo de arroz, farelo de trigo, farinha de trigo e fubá de milho. Os minerais Ca, Cu, K, Mn, Zn, Fe, Mg, Na e P foram determinados usando a técnica de espectrometria de emissão atômica com fonte de plasma indutivamente acoplado (ICP OES. A análise estatística dos dados foi realizada por meio de médias e desvios padrão. As amostras apresentaram baixos teores para a maioria dos minerais analisados, com exceção dos ingredientes farelo de trigo e farinha de trigo. Em especial, observou-se que a multimistura não atingiu o mínimo necessário de 25% do valor diário (VD, para ser considerada complemento nutricional pelo Ministério da Saúde, para os minerais analisados, com exceção do Mn e Mg. Concluiu-se que não existe uma padronização nas quantidades dos ingredientes no preparo da multimistura e que os teores dos minerais não atendem às recomendações diárias necessárias para crianças.The objectives of this study were to determine the mineral content of ingredients and multimixture produced and commercialized in Teresina-PI/Brazil and evaluate the mineral composition in relation to the dietary reference intakes (DRI. The studied samples were multimixture, cassava leaf powder, rice bran, wheat bran, wheat flour and corn flour. The minerals Ca, Cu, K, Mn, Zn, Fe, Mg, Na and P were determined using the atomic emission spectrometry (ICP OES. The statistics analysis of the data was carried out by mean and standard deviations. The samples had low levels in most of the analyzed minerals, except for wheat bran and wheat flour. In particular, it was observed that the multimixture did not reach the minimum of 25% of the

  10. La “voluntad virtual” del consumidor, ¿un nuevo test para determinar la abusividad de una cláusula no negociada en contratos con consumidores? (STJUE de 14 de marzo de 2013, asunto c-415/11)

    OpenAIRE

    Marín López, Manuel Jesús

    2013-01-01

    Conforme a la Directiva 93/13/CEE, una cláusula es abusiva cuando, en contra de las exigencias de la buena fe, causa un desequilibrio importante en los derechos y obligaciones de las partes. La STJUE 14.3.2013 analiza el concepto de cláusula abusiva, examinando por separado los dos parámetros citados: el “desequilibrio importante” y la “contrariedad a la buena fe”. En relación a éste último, introduce el parámetro de la “voluntad virtual” del consumidor: hay que valorar si el consumidor hubie...

  11. Dolo y mala fe

    Directory of Open Access Journals (Sweden)

    Carlos Arturo Gómez Pavajeau

    2010-12-01

    Full Text Available Se ha dicho por grandes penalistas que las tesis en nuestra disciplina son una eterna vuelta al pasado. Empero, debe constatarse, que ello se ha dicho en un sentido de lo clásico: una vuelta a lo que resulta digno de admirar en cualquier época, toda vez que las experiencias históricas negativas nos previenen de repetir el pasado, razón fundamental por la cual debemos conocerlo. En este escrito pretendemos mostrar cómo algunas tendencias actuales nos indican que épocas nefastas ya superadas pueden repetirse, lo cual particularmente sucede tanto con la noción de dolo como con la de mala fe, concepto que de imponerse destruiría, a la manera como se derrumba un castillo de naipes, el sólido edificio dogmático construido por el Derecho penal liberal.

  12. Pressure effects reveal that changes in the redox states of the heme iron complexes in the sensor domains of two heme-based oxygen sensor proteins, EcDOS and YddV, have profound effects on their flexibility.

    Science.gov (United States)

    Anzenbacher, Pavel; Marchal, Stéphane; Palacký, Jan; Anzenbacherová, Eva; Domaschke, Thomas; Lange, Reinhard; Shimizu, Toru; Kitanishi, Kenichi; Stranava, Martin; Stiborová, Marie; Martinkova, Marketa

    2014-12-01

    The catalytic activity of a heme-based oxygen sensor phosphodiesterase from Escherichia coli (EcDOS) towards cyclic diGMP is regulated by the redox state of the heme iron complex in the enzyme's sensing domain and the association of external ligands with the iron center. Specifically, the Fe(II) complex is more active towards cyclic diGMP than the Fe(III) complex, and its activity is further enhanced by O2 or CO binding. In order to determine how the redox state and coordination of the heme iron atom regulate the catalytic activity of EcDOS, we investigated the flexibility of its isolated N-terminal heme-binding domain (EcDOS-heme) by monitoring its spectral properties at various hydrostatic pressures. The most active form of the heme-containing domain, i.e. the Fe(II)-CO complex, was found to be the least flexible. Conversely, the oxidized Fe(III) forms of EcDOS-heme and its mutants had relatively high flexibilities, which appeared to be linked to the low catalytic activity of the corresponding intact enzymes. These findings corroborate the suggestion, made on the basis of crystallographic data, that there is an inverse relationship between the flexibility of the heme-containing domain of EcDOS and its catalytic activity. The Fe(II)-CO form of the heme domain of a second heme-based oxygen sensor, diguanylate cyclase (YddV), was also found to be quite rigid. Interestingly, the incorporation of a water molecule into the heme complex of YddV caused by mutation of the Leu65 residue reduced the flexibility of this heme domain. Conversely, mutation of the Tyr43 residue increased its flexibility.

  13. A Importância dos Carboidratos na Alimentação dos Eqüinos

    Directory of Open Access Journals (Sweden)

    Eliane Morgado:

    2008-10-01

    Full Text Available Os carboidratos são extremamente importantes na dieta dos eqüinos,sendo os carboidratos não estruturais as fontes primárias de energia. Os monossacarídeos são as únicas formas de carboidratos que podem ser absorvidos pelo intestino delgado e os carboidratos mais complexos são fermentados no intestino grosso, onde ocorre a fermentação microbiana. As frações dos carboidratos são definidas pelos métodos químicos ou enzimáticos utilizados nas análises, e vários são os métodos de avaliação da qualidade das forragens, e da composição bromatológica dos ingredientes. O sistema de partição dos carboidratos mais adequada à fisiologia digestiva dos eqüinos, seria o fracionamento dos carboidratos não fibrosos em grupo dos Carboidratos hidrolisáveis a açúcar simples no intestino delgado, e grupo dos carboidratos fermentáveis no intestino grosso, produzindo ácidos graxos voláteis.

  14. OS VIDEOJOGOS: AS REPRESENTAÇÕES DOS PAIS SOBRE A PRÁTICA DOS FILHOS

    Directory of Open Access Journals (Sweden)

    Sílvia Coimbra

    2015-04-01

    Full Text Available Os videojogos são um fenómeno com crescimento progressivo desde a década de 70, alojando-se na vida das crianças, dos jovens e até mesmo na dos adultos. Ao passarem muitas horas em frente a um ecrã as crianças podem estar a tornar-se pequenas pessoas inativas, porque as horas que passam a jogar videojogos poderiam ser dedicadas à actividade física, tornando assim as crianças mais ativas e menos sedentárias (Bergamasco et al., 2008. O magnetismo exercido pelos videojogos pode assustar os intervenientes da educação, pois as crianças e jovens de hoje passam horas a jogar, e nesse período de tempo não se consegue saber o que é que as crianças aprendem, ou não aprendem (Pereira, 2007. As investigações nesta área têm abordado esta temática, demonstrando que é importante ter atenção aos conteúdos e número de horas que as crianças dispensam a jogar de forma a poder haver um maior controle desse tempo (Marivoet, 2001; Moita, 2007; Pereira, 2007.Objetivo: Contribuir para o conhecimento e aprofundamento da problemática dos videojogos, relativamente à representação que os pais têm sobre a sua influência no desenvolvimento das crianças, as horas que os seus filhos passam a jogar e ainda se o tempo de jogo furta tempo à actividade física.

  15. ANÁLISIS DE “BUENAS PRÁCTICAS” DEL E-LEARNING EN LAS UNIVERSIDADES ANDALUZAS ANALYSIS OF "BEST PRACTICES" OF E-LEARNING IN ANDALUSIAN UNIVERSITIES

    Directory of Open Access Journals (Sweden)

    Julio Cabero Almenara

    2010-02-01

    Full Text Available Este artículo ofrece los resultados obtenidos del analisis de “buenas prácticas” de treinta profesores de las diferentes Universidades Andaluzas. Para la recogida de datos se han utilizado tres instrumentos: biograma, entrevistas individualizadas y observación de materiales. Estos profesores tienen una actitud positiva hacia la formación e-learning, trabajan en grupo y llevan más de 2 años impartiéndolas junto a la presencial. Consideran esta formación como una gran ayuda para los alumnos por el volumen de material disponible, la flexibilización en su uso, la posibilidad de consulta y el trato es más personal. Por otro lado, estos profesores señalan la cantidad de tiempo y esfuerzo que requiere la elaboración y actualización de los materiales. Así como la escasa formación para su utilización didáctica y educativa, subsanada por su autoformación. Los materiales utilizados son considerados como buenos en lo técnico, didáctico y comunicativo.This article provides the results of the analysis of "best practices" of thirty teachers of different Andalusian Universities. For the collection of data we have been used three instruments: biogram, individualized interviews and observation of materials. These teachers have a positive attitude towards e-learning, working in groups and carry more than 2 years teaching with (together the face to face. They consider this training as a high help to students because of the high volume of available material, application flexibility, the possibility of consultation and the treatment is more personal. Moreover, these teachers pointed out the amount of time and effort required for the preparation and updating of materials, and also here poor training for teaching and educational use, that is remedied by themselves. The materials used are is adecuated in the technical, teaching and in the communication way.

  16. Evaluación de buenas prácticas de manufactura en la elaboración de fórmulas enterales en hospitales públicos de Santiago, Chile

    Directory of Open Access Journals (Sweden)

    Sandra Lara González

    2013-12-01

    Full Text Available Antecedentes: La Elaboración de fórmulas enterales está sujeta a diversos riesgos de contaminación. La Organización Mundial de la Salud (OMS y la Organización para la Alimentación y la Agricultura (FAO han emitido alertas y recomendaciones para su prevención, sugiriendo la estandarización y protocolización de todos los procedimientos involucrados. Objetivo: Elaborar y evaluar el cumplimiento de los criterios técnicos de una Pauta de Verificación de Buenas Prácticas de Manufactura, con relación a elaboración, conservación y administración de fórmulas enterales en hospitales de la provincia de Santiago. Material y métodos: Los criterios de verificación consideraron Planta Física, Equipamiento e Implementación, Normas Higiénicas y Sanitarias, Recurso Humano, Organización y Administración, Garantía de Inocuidad y Aseguramiento de la Calidad. Se definieron 639 criterios, 309 de Riesgo Tipo 1, por mayor riesgo de producir contaminación. El estudio se hizo por observación de las Unidades de Central de Fórmulas Enterales y entrevista con el profesional encargado. Se analizó la mediana de cumplimiento de cada grupo de criterios de riesgo tipo 1 y total. Resultados: Se evaluaron 14 hospitales públicos. El grado de cumplimiento de los 639 alcanzó una mediana de 33,2% (p25-75 31,6% -40,4%, con el valor más bajo para planta física con 27,9% (p25-75 23,9% -38,2% y el mayor para recurso humano con 52,4% (p25-75 44,1%-52,4%. La mediana de grado de cumplimiento para Criterios Riesgo Tipo 1, fue sólo de 31,8% (p25-75 27,5% - 41,2%. Conclusión: La mayoría de las Unidades evaluadas, cumple con menos de la mitad de las recomendaciones internacionales o del Ministerio de Salud de Chile. Se deben elaborar protocolos y capacitar al personal para asegurar la calidad e inocuidad en la elaboración de fórmulas enterales y reducir los riesgos de infección.

  17. Validación y las buenas prácticas de fabricación en la producción de ingredientes farmacéuticos activos no esteriles de origen natural.

    Directory of Open Access Journals (Sweden)

    José Javier Mosquera Sierra

    2005-01-01

    Full Text Available El surgimiento de Las Buenas Prácticas de Fabricación (BPF y del término Validación, se debe a una historia de reacciones a lamentables accidentes y fraudes en la industria farmacéutica que parten desde inicios del pasado siglo. En la actualidad todos los Sistemas de Aseguramiento de Calidad de las organizaciones productoras de Ingredientes Farmacéuticos Activos (IFA están obligados a establecer un programa de validación para demostrar, con evidencias documentadas, y de acuerdo a los principios de las BPF, que cualquier procedimiento, proceso, equipamiento, material, actividad o sistema conduce realmente a los resultados esperados. El presente trabajo tiene como objetivo describir las vías para implementar un programa efectivo de validación, a través de un enfoque integrado y científico, para los procesos de obtención de IFA (no estériles de origen natural. Se parte del establecimiento de la política de validación por la dirección de la organización, la cual mantendrá el concepto de ciclo de vida de la validación: empieza con el desarrollo del programa y no acaba hasta que el producto sea retirado del mercado. Se aborda además la importancia del traspaso de información de la etapa de investigación-desarrollo a la de producción de lotes comerciales. El trabajo describe también detalles y ejemplos para establecer los planes maestros de validación, los protocolos, y la redacción de los reportes finales de validación. Por último, se discuten otros temas como las desviaciones y fallas, control de cambios, y tendencias del proceso, elementos pertenecientes al programa de validación que relacionan directamente al Aseguramiento de la Calidad con la parte de producción de IFA. No se trata lo relacionado a la validación de los métodos de limpieza ya que éstos se deben establecer in-situ por cada organización, en dependencia de las características de las producciones que se realicen.

  18. LOS PROCESOS DE INNOVACIÓN EDUCATIVA EN LA FORMACIÓN UNIVERSITARIA, NUEVOS GENERADORES DE BUENAS PRÁCTICAS EN TECNOLOGÍA EDUCATIVA EDUCATIVE INNOVATION PROCESS IN UNIVERSITY FORMATION, NEW PRODUCTIVE BESTS PRACTICES IN EDUCATIVE TECHNOLOGY

    Directory of Open Access Journals (Sweden)

    Bartolomé Rubia-Avi

    2010-02-01

    Full Text Available La influencia de la innovación educativa en la transformación de la Universidad Española para el Reforma Europea de la Enseñanza Superior es un aspecto crucial. Varios aspectos están haciendo que características del modelo formativo tradicional, tengan que ser revisadas a la luz de las demandas sociales y la mejora necesaria de esta formación. Pero este cambio está siendo generado por pequeños grupos de docentes que, imbuidos por la necesidad de transformar su práctica educativa, a partir de pequeños grupos, generan “Comunidades de Práctica” donde reflexionan y toman decisiones sobre buenas prácticas. Las TICs son el eje de dichas mejoras, siendo este trabajo un pequeño esbozo de una de esas experiencias llevadas a cabo por un grupo de personas del Grupo de Investigación Reconocido de la Universidad de Valladolid, GSIC-EMIC, asociado a varias de estos grupos de profesores y profesoras, que están trabajando en transformar su práctica diaria desde hace algunos años. The influence of educational innovation in the transformation of Spanish Universities to achieved the goals posed by the European Higher Education Area is a crucial aspect for this reform. This process of deep impact within the European countries is promoting the revision of traditional teaching methods. Small groups of teachers and communities of practice are leading this revision by reflecting upon the main issues affecting the higher education system at the same time that they propose horizontal innovations to overcome them. Information and Communication Technologies are becoming of special relevance with regard to the aforementioned innovations. This paper describes a experience conducted within the GSIC-EMIC research team that illustrates the efforts done by a community of teachers at the University of Valladolid (Spain to analyze and improve their own teaching practices.

  19. Dos iglesias de Pierre Pinsard, arquitecto Francia

    Directory of Open Access Journals (Sweden)

    Pinsard, Pierre

    1972-09-01

    Full Text Available Parish Centre of Saint Pierre de Chanel, Bourg-en-Bresse It is located in the modern part of the town, and is built on three levels: — Basement, with public garage. — Ground floor, which has nave with seating capacity for 639, chapel, mortuary, sacristy, presbytery and offices, as well as courtyard, garden, car-park and belfry. — Upper floor, with catechism rooms, gallery, offices and sitting rooms annexed to the presbytery. The basic construction is of expossd concrete with metal columns. Parish Centre of Saint Jean Baptiste de La Salle, Rouen This building is situated on the left bank of the Seine. Consisting of one floor only, it has a main nave with room for 600, a chapel, catechism rooms, two sacristies, mortuary, presbytery, choir and gardens. The construction is of concrete faced with brick, and metal roof with interior wood lining.Centro Parroquial de San Pedro de Chanel, en Bourg-en-Bresse Esta situado en la zona moderna y se ha distribuido en tres plantas: — Sótano: con garaje público. — Planta noble: con nave capaz para 639 plazas, capilla, mortuorio, sacristía, presbiterio y oficinas; además de la plaza, el jardin, aparcamiento y campanil. — Planta alta: con salas de catecismo, tribuna, oficinas y estancias anejas al presbiterio. Construcción fundamental de hormigón visto con pilares metálicos. Centro Parroquial de San Juan Bautista de La Salle, en Ruán Está situado en la orilla izquierda del Sena. Consta de una sola planta, con nave para 600 fieles, capilla, salas de catecismo, dos sacristías, mortuorio, presbiterio, coro y jardines. Construcción a base de hormigón, fábrica de ladrillo a cara vista y cubierta metálica revestida de madera el interior.

  20. ESTUDO SOBRE O IMPACTO DOS PROCESSADORES HOSPEDEIROS

    Directory of Open Access Journals (Sweden)

    Alba S. B. Lopes

    2008-05-01

    Full Text Available Arquiteturas reconfiguráveis são dispositivos de hardware capazes de modificar sua estrutura de hardware de acordo com a aplicação a ser executada. Tais dispositivos surgiram como uma alternativa às soluções de hardware tradicionais na tentativa de equilibrar flexibilidade e desempenho. Uma das principais formas de utilização de arquiteturas reconfiguráveis corresponde a um bloco reconfigurável anexado a um processador hospedeiro. Esse processador é responsável por executar diversas tarefas críticas, incluindo o particionamento hardware/software e indicar o momento do bloco reconfigurável executar. Apesar de existirem diversas propostas de arquiteturas reconfiguráveis na literatura, pouco se estudou sobre o impacto do processador hospedeiro na arquitetura. Nesse contexto, esse artigo apresenta um estudo sobre o impacto do processador hospedeiro no desempenho da arquitetura reconfigurável híbrida. Como estudo de caso foi realizada uma avaliação sobre o uso dos processadores SPARC V8 da Sun Microsystems e Nios II da Altera como processadores hospedeiros da arquitetura reconfigurável híbrida RoSA. O objetivo deste estudo é realizar a comparação entre o desempenho desses processadores e identificar qual deles é o mais adequado para anexar a arquitetura em questão. Os resultados mostraram que foi possível alcançar até 47% de ganho de desempenho com o uso do processador Nios II em comparação ao SPARC V8, indicando o primeiro como mais adequado para a arquitetura RoSA. PALAVRAS-CHAVE: arquiteturas reconfiguráveis, processador hospedeiro, desempenho.

  1. Calidad percibida por dos poblaciones adscritas a dos centros de salud de la provincia de Cuenca

    Directory of Open Access Journals (Sweden)

    Retamal González Antonio

    2000-01-01

    Full Text Available FUNDAMENTO: Para prestar un servicio de calidad es fundamental conocer la opinión que sobre la misma tienen los usuarios del mismo. El objetivo del presente trabajo es medir y comparar la calidad percibida por dos poblaciones asignadas a dos centros de salud de la provincia de Cuenca. MÉTODO: Se trata de un estudio descriptivo transversal. Las Zonas Básicas de Salud estudiadas han sido el Centro de Salud de Cardenete y Centro de Salud de Motilla del Palancar, ambos del Área de Salud de Cuenca. Se ha hecho un muestreo aleatorio estratificado por cuotas de edad y sexo a partir de la tarjeta sanitaria individual. Se ha medido la calidad percibida con un cuestionario validado y fiable, utilizado anteriormente con fines similares por el Ministerio de Sanidad y Consumo. RESULTADOS: Se analizan un total de 295 encuestas, 147 a varones y 148 a mujeres. La media de edad es de 48,83 años (DE: 18,77 para el Centro de Salud de Motilla, en Centro de Salud de Cardenete es de 61,93 años (DE: 15,17. La media de frecuencias mensuales de visitas para Centro de Salud de MP ha sido de 1,56 (DE: 1,91; esta media para el Centro de Salud de Cardenete ha sido:2,49 (DE: 4,27. La media de frecuencias semanales para el Centro de Salud de MP ha sido: 0,32 (DE: 0,66; para el Centro de Salud de Cardenete ha sido: 0,49 (DE: 1,03. El tiempo de espera en el Centro de Salud de MP ha sido: 10,86 minutos (DE: 8,27; en el Centro de Salud de Cardenete: 7,88 (DE: 4,55. 83,4 % de los usuarios de los dos Centros de Salud de conocen la posibilidad de libre elección de médico de cabecera. Se han encontrado diferencias estadísticamente significativas en 11 de los 21 ítems estudiados sobre calidad percibida de que consta el cuestionario CONCLUSIÓN. Los resultados de los componentes de la atención según el análisis factorial de los ítems de calidad percibida son coincidentes con los resultados de calidad percibida. De los dos grupos de usuarios estudiados, los que perciben

  2. Glucogenosis tipo I: reporte de dos casos en dos hermanos de Cartagena de Indias-Colombia

    OpenAIRE

    Alvear-Sedán Ciro; Barboza-Ubarnes, Miryam; Bonillas-Fierro Miguel [q.e.p.d

    2011-01-01

    CASO CLÍNICO: # 1. Producto del primer embarazo de padres no consanguíneos, con lactancia hasta los dos años. A los 18 meses deedad presentó distensión abdominal, hepatomegalia difusa no dolorosa, diarrea de mes y medio, debilidad generalizada, edemaprogresivo en cara y pies, anasarca y anemia. Vesícula, bazo y riñones normales y examen neurológico sin alteraciones. Nopresentó hipoglucemia, ácido láctico normal. Pruebas hepáticas alteradas; colesterol, triglicéridos y ácido úrico en el límite...

  3. Influência dos estilos parentais no desenvolvimento do comportamento criminal dos reclusos

    OpenAIRE

    Silva, Andrea Venícia Santos Reis

    2010-01-01

    A presente investigação procura contribuir para um conhecimento mais aprofundado de uma problemática complexa – os estilos parentais e o desenvolvimento do comportamento criminal. Procura-se compreender em que medida os estilos parentais estão relacionados e influenciam o desenvolvimento do comportamento criminal de reclusos, controlando pelas características sócio-demográficas e antecedentes familiares dos sujeitos. O estudo engloba a população reclusa do Estabelecimento Prisional de C...

  4. avaliação dos riscos para a saúde dos consumidores

    OpenAIRE

    Pereira, Tiago Filipe Garcia

    2014-01-01

    Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Ciências Farmacêuticas A popularidade das novas substâncias psicoativas, conhecidas como “drogas legais”, está em contínuo crescimento, particularmente entre adolescentes e adultos jovens. Estes produtos são normalmente vendidos via Internet e em lojas designadas por “smart shops”. A internet desempenha um papel importante no estímulo para o ...

  5. Magnetism of Fe/V and Fe/Co multilayers

    Energy Technology Data Exchange (ETDEWEB)

    Eriksson, O [Department of Physics, Uppsala University, Box 530 Uppsala (Sweden); Bergqvist, L [Department of Physics, Uppsala University, Box 530 Uppsala (Sweden); Holmstroem, E [Department of Physics, Uppsala University, Box 530 Uppsala (Sweden); Bergman, A [Department of Physics, Uppsala University, Box 530 Uppsala (Sweden); LeBacq, O [Laboratoire de Physique et Modelisation des Milieux Condenses, Maison des Magisteres, CNRS, BP 166, 38042 Grenoble (France); Frota-Pessoa, S [Instituto de Fisica, Universidade de Sao Paulo, CP 66318, 05315-970, Sao Paulo, SP (Brazil); Hjoervarsson, B [Department of Physics, Uppsala University, Box 530 Uppsala (Sweden); Nordstroem, L [Department of Physics, Uppsala University, Box 530 Uppsala (Sweden)

    2003-02-12

    We discuss in this paper the magnetic and structural parameters of Fe/V and Fe/Co multilayers. The electronic structure, magnetic moments (spin and orbital) and Curie temperatures as well as the magneto-crystalline anisotropy are calculated using first principles theory. Although theory is fairly successful in reproducing the experimental data we argue that the observed difference between theory and experiment most likely is due to lattice imperfections and that the interface between e.g. Fe and V is not perfectly sharp. We also present a model, based on the theory of elasticity, for analysing the structural properties of multilayers.

  6. Fe II Diagnostic Tools for Quasars

    CERN Document Server

    Verner, E; Verner, D; Johansson, S; Kallman, T; Gull, T R

    2004-01-01

    The enrichment of Fe, relative to alpha-elements such as O and Mg, represents a potential means to determine the age of quasars and probe the galaxy formation epoch. To explore how \\ion{Fe}{2} emission in quasars is linked to physical conditions and abundance, we have constructed a 830-level \\ion{Fe}{2} model atom and investigated through photoionization calculations how \\ion{Fe}{2} emission strengths depend on non-abundance factors. We have split \\ion{Fe}{2} emission into three major wavelength bands, \\ion{Fe}{2} (UV), \\ion{Fe}{2}(Opt1), and \\ion{Fe}{2}(Opt2), and explore how the \\ion{Fe}{2}(UV)/\\ion{Mg}{2}, \\ion{Fe}{2}(UV)/\\ion{Fe}{2}(Opt1) and \\ion{Fe}{2}(UV)/\\ion{Fe}{2}(Opt2) emission ratios depend upon hydrogen density and ionizing flux in broad-line regions (BLR's) of quasars. Our calculations show that: 1) similar \\ion{Fe}{2}(UV)/\\ion{Mg}{2} ratios can exist over a wide range of physical conditions; 2) the \\ion{Fe}{2}(UV)/\\ion{Fe}{2}(Opt1) and \\ion{Fe}{2}(UV)/\\ion{Fe}{2}(Opt2) ratios serve to constrain...

  7. A institucionalização da câmara dos deputados dos Estados Unidos

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    Nelson W. Polsby

    2008-06-01

    Full Text Available O artigo analisa como se deu a institucionalização da Câmara dos Deputados dos Estados Unidos, desde seu início, no final do século XVIII, até meados do século XX. Esse processo é analisado a partir de três variáveis fundamentais: 1 a delimitação funcional em relação a outras organizações, particularmente políticas; 2 a relativa complexidade da instituição, ou seja, até que ponto suas funções são internamente separadas em alguma base regular e explícita; 3 o universalismo e o automatismo nos procedimentos adotados para conduzir seus diversos assuntos internos. Cada uma dessas variáveis é sucessivamente examinada do ponto de vista histórico ao longo do artigo; a título de conclusão, apresentam-se algumas observações especulativas sobre causas, conseqüências e possíveis lições que se pode tirar da institucionalização da Câmara.

  8. O valor da moeda e a teoria dos preços dos ativos

    Directory of Open Access Journals (Sweden)

    Fernando de Holanda Barbosa

    2005-06-01

    Full Text Available Este artigo usa o enfoque da teoria dos preços dos ativos na determinação do preço da moeda para apresentar uma resenha concisa sobre os seguintes tópicos da teoria monetária: i preço da moeda: bolhas versus fundamentos; ii equilíbrio múltiplo; iii indeterminação do nível de preço ; iv quantidade ótima de moeda ; v hiperinflação; vi substituição de moeda e vii rigidez do preço no curto prazo.The price of money, as the price of any financial asset, can be determined through asset pricing theory. Based on this approach, this paper presents a concise survey of the following topics of monetary theory: i price of money: bubbles versus fundamentals; ii multiple equilibria; iii price level indeterminacy; iv optimum quantity of money; v hyperinflation; vi currency substitution, and vii price of money rigidity.

  9. Melhoria da disponibilidade dos equipamentos para o aumento do OEE

    OpenAIRE

    Valente, Filipe Daniel Silva

    2012-01-01

    Este trabalho tem como tema central a eficiência global dos equipamentos (ou Overall Equipment Efficiency - OEE), um indicador que surgiu na metodologia TPM – Total Productive Maintenance. A utilização do OEE permite às empresas analisar as reais condições de utilização dos seus activos, através da identificação das seis grandes perdas dos equipamentos, reflectidas nos índices de disponibilidade, eficiência e qualidade. A multiplicação destes índices resulta no valor do OEE....

  10. Do valor da vida, dos interesses, do sujeito

    OpenAIRE

    Marciano Adilio Spica

    2004-01-01

    O presente artigo versa sobre um dos mais polêmicos temas da ética prática, a saber, a inclusão de seres não-humanos na esfera da moral. Busca-se aqui reconstruir os argumentos de Peter Singer e Holmes Rolston III sobre o valor da vida, dos interesses e do sujeito. Ambos os autores defendem um alargamento da esfera moral, tradicionalmente reduzida somente aos seres da espécie humana. Suas teorias, porém, entram em conflito quando se trata dos limites da esfera moral. Enquanto Singer def...

  11. Atitudes dos residentes face a festivais de música

    OpenAIRE

    Gomes, José Manuel Mano da Silva

    2013-01-01

    O principal objetivo deste projeto de investigação é analisar o apoio dos residentes da cidade de Barcelos face ao evento Milhões de Festa. A satisfação do objetivo referido implicou a realização de uma reflexão teórica, a partir de uma pesquisa bibliográfica focada no conceito de evento, nas perceções e atitudes dos residentes face aos eventos e nos fatores que influenciam a atitude dos residentes face aos eventos. Com base nesta reflexão teórica foi possível desenvolver um...

  12. Application of Al/B/Fe2O3 Nano Thermite in Composite Solid Propellant

    Directory of Open Access Journals (Sweden)

    Jingke Deng

    2016-03-01

    Full Text Available Hydroxyl-terminated polybutadiene (HTPB propellant were prepared with different content of Al/B/Fe2O3 nano thermite, and the mechanical, thermal and energetic performances were studied. Al/B/Fe2O3 nano thermite exhibited good compatibility with HTPB and dioctyl sebacate (DOS through differential scanning calorimetry (DSC tests. Mechanical experiments show that the mechanical properties of HTPB propellant could be improved by the addition of a small quantity of Al/B/Fe2O3 nano thermite, compared with the absence of Al/B/Fe2O3 nano thermite. For example, with the addition of 3% Al/B/Fe2O3 nano thermite, the tensile strength and elongation of propellant had the increase of 15.3% and 32.1%, respectively. Thermal analysis indicated that the decomposition of ammonium perchlorate (AP in HTPB propellant could be catalyzed by Al/B/Fe2O3 nano thermite, the high-temperature exothermic peak of AP was shifted to lower temperature by 70.8 °C when the content of Al/B/Fe2O3 nano thermite was 5%, and the heat released was enhanced by 70%. At the same time, the heat of explosion of HTPB propellant could also be enhanced by the addition of Al/B/Fe2O3 nano thermite. Copyright © 2016 BCREC GROUP. All rights reserved  Received: 5th November 2015; Revised: 4th December 2015; Accepted: 30th December 2015 How to Cite: Deng, J., Li, G., Shen, L., Luo, Y. (2016. Application of Al/B/Fe2O3 Nano Thermite in Composite Solid Propellant. Bulletin of Chemical Reaction Engineering & Catalysis, 11 (1: 109-114. (doi:10.9767/bcrec.11.1.432.109-114 Permalink/DOI: http://dx.doi.org/10.9767/bcrec.11.1.432.109-114

  13. Teores de Fe, Mn, Zn, Cu, Ni E Co em solos de referência de Pernambuco Concentrations of Fe, Mn, Zn, Cu, Ni and Co in benchmark soils of Pernambuco, Brazil

    Directory of Open Access Journals (Sweden)

    Caroline Miranda Biondi

    2011-06-01

    Full Text Available Metais pesados formam um grupo de elementos com particularidades relevantes e de ocorrência natural no ambiente, como elementos acessórios na constituição de rochas. Esses elementos, apesar de associados à toxidez, exigem tratamento diferenciado em relação aos xenobióticos, uma vez que diversos metais possuem essencialidade (Fe, Mn, Cu, Zn e Ni e benefício (Co comprovados para as plantas. Nesse contexto, o objetivo deste trabalho foi determinar os teores naturais dos metais Fe, Mn, Zn, Ni, Cu e Co nos solos de referência de Pernambuco. Foram coletadas amostras de solo nas três regiões fisiográficas (Zona da Mata, Agreste e Sertão, dos dois primeiros horizontes dos 35 solos de referência do Estado de Pernambuco. A digestão das amostras baseou-se no método 3051A (USEPA, 1998, e a determinação foi efetuada em ICP-OES. Correlações significativas foram estabelecidas entre os metais e entre estes e a fração argila do solo, em ambos os horizontes, indicando a associação comum da maioria dos metais com solos mais argilosos. A maioria dos solos apresentou teores de Fe, Mn, Zn, Cu, Ni e Co menores que os de solos de outras regiões do País, com litologia mais máfica, o que corrobora o fato de que os teores desses elementos são mais diretamente relacionados aos minerais Fe-magnesianos. Os resultados indicam baixo potencial dos solos de Pernambuco em liberar Cu, Co e Ni para plantas, enquanto deficiências de Zn, Fe e Mn são menos prováveis. Os teores naturais de Fe, Mn, Zn, Cu, Ni e Co determinados podem ser utilizados como base para definição dos Valores de Referência de Qualidade para os solos de Pernambuco, de acordo com o preconizado pela legislação nacional.Heavy metals are a group of elements with specific features and natural occurrence in the environment, representing an accessory in the formation of rocks. These elements, although associated with toxicity, must be treated different from xenobiotics, since many

  14. The concept and fabrication of exchange switchable trilayer of FePt/FeRh/FeCo with reduced switching field

    Science.gov (United States)

    Zhou, T. J.; Cher, K.; Hu, J. F.; Yuan, Z. M.; Liu, B.

    2012-04-01

    We report the concept and fabrication of exchange switchable trilayer of FePt/FeRh/FeCo with reduced switching field for heat assisted magnetic recording (HAMR). A thin layer of FeRh is sandwiched between L10 FePt and magnetically soft FeCo. At room temperature, FePt and FeCo are magnetically isolated by the antiferromagnetic FeRh layer. After the metamagnetic transition of FeRh layer by heating, FePt and FeCo are exchange-coupled together through ferromagnetic FeRh layer. Therefore, the switching field of FePt can be greatly reduced via exchange-spring effect. Simulation work was carried out to understand the exchange coupling strength and the FeCo thickness effects on the switching field reduction. It is found that switching field decreases with the increase of exchange coupling strength and FeCo thickness. The trilayer films were also successfully fabricated. A clear change of reversal mechanism from two-step to one-step switching upon heating was observed and a 3-time switching field reduction was demonstrated. The results show the promise of the trilayer for HAMR applications.

  15. Análisis técnico-económico de la Cooperativa Cafetalera Juan Ramón Corea bajo los principios de las Buenas Prácticas Agrícolas, ciclo agrícola 2009/2010.

    OpenAIRE

    Cuadra Franco, Luis Alberto

    2011-01-01

    Las exigencias de inocuidad en el mercado internacional del café están empujando a los productores a cambiar las prácticas inapropiadas de manejo del cultivo del café. Para hacer frente a esta situación las instituciones públicas junto con el sector cafetalero impulsan la implementación de las Buenas Prácticas Agrícolas (BPA) en la producción primaria de café. El objetivo del estudio fue analizar el efecto de un protocolo básico de BPA sobre la utilidad neta y el margen de ganancia y su viabi...

  16. Comparison of Tunneling in Fe-based Superconductors with Multi-band MgB2

    Science.gov (United States)

    Zasadzinski, John; Iavarone, Maria

    MgB2 is an s-wave, phonon coupled, multiband superconductor that exhibits novel tunneling spectra including a subtle dip feature due to quasiparticle transfer between bands. Since this feature mimics the above-gap spectral dip feature observed in Fe-based superconductors, typically attributed to a strong coupling boson, it is worthwhile to consider whether quasiparticle transfer is relevant. We first show that the dip in MgB2 appears in the π-band, DOS (Δ = 2.4 meV) and is due to quasiparticle transfer to the σ-band with Δ = 7.2 meV. Reviewing the spectral dip in Fe-based superconductors, including new data on FeSe crystals, there are inconsistencies with quasiparticle transfer as the origin. The conclusion is that the spectral dip is more likely due to a boson, the resonance spin excitation, as found in cuprate superconductors.

  17. Sobriedade e embriaguez: a luta dos soldados de Cristo contra as festas dos tupinambás

    Directory of Open Access Journals (Sweden)

    João Azevedo Fernandes

    2007-01-01

    Full Text Available O artigo analisa a luta dos missionários cristãos, em especial os jesuítas, contra as festas e as bebidas alcoólicas dos tupinambás. Eles perceberam que, nestas festas, a cultura tupinambá, principal obstáculo à evangelização, se renovava e se reafirmava constantemente. O artigo também explora as principais estratégias usadas pelos europeus para alcançar o objetivo de extinguir as festas dos índios.

  18. Influência dos estilos musicais na atitude dos clientes: evidências experimentais em uma loja varejista

    OpenAIRE

    Gabriela Souza Assis; Janaina de Moura Engracia Giraldi

    2012-01-01

    O presente trabalho teve como objetivo comparar a influência dos diferentes estilos musicais no comportamento e na atitude dos clientes. Foi realizado um experimento em uma loja varejista na cidade de Uberaba (MG). Neste experimento, foram testados três estilos musicais (sertanejo, axé e pop rock) e a ausência de música, como grupo controle. Os dados foram coletados por meio de um questionário estruturado com questões que procuraram medir a atitude do cliente através dos três componentes (afe...

  19. Growth of FeRh thin films and magnetic properties of FePt/FeRh bilayers

    Energy Technology Data Exchange (ETDEWEB)

    Goto, T. E-mail: takao@tjcc.tohoku-gakuin.ac.jp; Ogata, H.; Sato, T.; Yamaguchi, K.; Shima, T.; Yoshida, H

    2004-05-01

    A method for growing the FeRh thin films with a good (0 0 1) texture on fused silica (SiO{sub 2}-glass) substrates is presented. Seed layers of Fe/Ir and the substrate temperature as low as 200 deg. C, at which FeRh is deposited, are effective for growing the Ir-substituted FeRh films with a good (0 0 1) texture, though annealing is necessary after deposition. Furthermore, a FePt layer was deposited onto the Fe(Rh,Ir) and perpendicularly magnetized FePt film with (0 0 1)-texture was fabricated.

  20. Tecnologia dos sonhos em Artemidoro, Freud, Jung e nos Warlpiri

    Directory of Open Access Journals (Sweden)

    Abrahão de Oliveira Santos

    2014-08-01

    Full Text Available Apresentaremos distintas tecnologias dos sonhos: em Artemidoro, Freud, Jung e nos Warlpiri. Artemidoro revela a mensagem onírica imprescindível à condução do cidadão, com os elementos das instituições, da cidade, do cosmo. Com Freud, no moderno mundo europeu, o sonho recebe o sentido da interioridade. Outra leitura é de Carl Jung. O uso dos sonhos tem seu sentido histórico, se relacionando com as práticas de governo, os modos de condução da vida e da cidade. Para além das tradições eurodescendentes e mentalistas vigentes, apresentaremos a tecnologia coletiva dos sonhos dos Warlpiri e uma nova possibilidade de lidarmos com a experiência onírica.

  1. Electrodeposited FePt films

    OpenAIRE

    Rhen, Fernando M. F.; Hinds, Gareth; O'Reilly, Cora; Coey, John Michael David

    2003-01-01

    A novel bath for electrodepositing FePt films was developed and films were electrodeposited on copper substrates with thickness up to 0.45 m. The magnetic and structural properties of the films were measured. The films developed 0.3-T coercivity after annealing at 400 C and formed the 10 FePt phase. Films are shiny and smooth. Morphology was found to be affected by the annealing process.

  2. SEGUNDA TELA: A INTERNET PERVASIVA COMO POSSIBILIDADE DE EXTENSÃO DOS CONTEÚDOS TELEVISUAIS

    Directory of Open Access Journals (Sweden)

    Adriana Pierre Coca

    2013-12-01

    Full Text Available Este artigo se alicerça, sobretudo, no conceito do fenômeno segunda tela (PROULX; SHEPATIN, 2012. Analisamos como as emissoras de TV aberta brasileiras vêm se comportando na interação com o ciberespaço. Partimos do pressuposto que, na reconfiguração dos modos de ver televisão; a internet, por ser cada vez mais um meio pervasivo, se torna uma aliada e não um perigo a hegemonia televisual. A transmidiação como apontada por Henry Jenkins (2009 está sendo colocada em prática com entusiasmo e as redes sociais, por exemplo, já se convertem em índices que mostram o reflexo do intenso diálogo entre a TV e a internet.

  3. Synergistic catalysis of isolated Fe3+ and Fe2O3 on FeOx/HZSM-5 catalysts for Friedel-Crafts benzylation of benzene

    Institute of Scientific and Technical Information of China (English)

    Tao Lin; Xin Zhang; Rong Li; Ting Bai; Si Ying Yang

    2011-01-01

    FeOx/HZSM-5 catalyst with 8 wt.% Fe-loading (8-FeZ) exhibited significantly higher reactivity in the benzylation of benzene with benzyl chloride than FeOx/HZSM-5 catalyst with 2.5 wt.% Fe-loading (2.5-FeZ) because the synergistic catalysis between isolated Fe3+ and superfine Fe2O3 occurred on 8-FeZ in the reaction.

  4. Dos madres adolescentes, dos vínculos: ¿qué marca la diferencia?

    Directory of Open Access Journals (Sweden)

    Pierina Traverso K.

    2007-06-01

    Full Text Available Se presenta un estudio de caso de dos madres adolescentes de la misma edad (17 años, con el cual se intenta explorar las representaciones maternas y las interacciones madre-bebe, es decir, las distintas maneras de “estar con” el bebe. El estudio pretende discutir que la maternidad adolescente en sí misma no es un factor de riesgo, sino que otras variables moderadoras como la calidad de las redes de sostenimiento y la función reflexiva con que cada joven madre cuenta. Las representaciones maternas fueron evaluadas a través de una entrevista semi-estructurada sobre representaciones maternas (Traverso, 2006 y las interacciones madre-bebe fueron medidas y filmadas a través del Mother-Infant Global-Ratings para dos y cuatro meses (Murray, Fiori-Cowley & Cooper, 1996.---A case study of two adolescent mothers of the same age is presented (17 years old with which it is intended to explore the maternal representations and mother-baby interactions, that is, the different ways of “being with” a baby. The study pretends to discuss that it is not adolescent motherhood in itself a risk factor, but other mediating variables such as supportnetwork and the reflective function with which each young mother counts. Maternal representations were assessed through a semi-structured interview about maternal representations (Traverso, 2006 and the mother-infant interactions were measured and filmed through the Mother-Infant Global Ratings for two and four months (Murray, Fiori-Cowley & Cooper, 1996.

  5. Study of Cu-doping effects on magnetic properties of Fe-doped ZnO by first principle calculations

    Indian Academy of Sciences (India)

    A El Amiri; H Lassri; M Abid; E K Hlil

    2014-06-01

    Using ab initio calculations on Zn0.975–Fe0.025CuO ( = 0, 0.01, 0.02, 0.05), we study the variations of magnetic moments vs Cu concentration. The electronic structure is calculated by using the Korringa–Kohn–Rostoker (KKR) method combined with coherent potential approximation (CPA). We show that the total magnetic moment and magnetic moment of Fe increase on increasing Cu content. From the density of state (DOS) analysis, we show that Cu-induced impurity bands can assure, by two mechanisms, the enhancement of Fe magnetic moment in Zn0.975–Fe0.025CuO.

  6. Temperature and pressure dependence of the Fe-specific phonon density of states in Ba(Fe1-xCox)2As2

    Energy Technology Data Exchange (ETDEWEB)

    Delaire, O [Oak Ridge National Laboratory (ORNL); Lucas, M S [Oak Ridge National Laboratory (ORNL); Dos santos, A M [Oak Ridge National Laboratory (ORNL); Subedi, Alaska P [ORNL; Safa-Sefat, Athena [ORNL; McGuire, Michael A [ORNL; Mauger, L [W. M. Keck Laboratory, Pasadena, CA; Munoz, J A [W. M. Keck Laboratory, Pasadena, CA; Tulk, Christopher A [ORNL; Xiao, Y [HPCAT Geophysical Lab, Argonne, IL; Somayazulu, M [Geophysical Lab, Washington, D. C.; Zhao, J. Y. [Argonne National Laboratory (ANL); Sturhahn, W [Argonne National Laboratory (ANL); Alp, E. E. [Argonne National Laboratory (ANL); Singh, David J [ORNL; Sales, Brian C [ORNL; Mandrus, David [ORNL; Egami, Takeshi [ORNL

    2009-01-01

    The {sup 57}Fe-specific phonon density of states (DOS) of Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} single crystals (x=0.0, 0.08) was measured at cryogenic temperatures and at high pressures with nuclear-resonant inelastic x-ray scattering. Measurements were conducted for two different orientations of the single crystals, yielding the orientation projected {sup 57}Fe-phonon density of states for phonon polarizations in-plane and out-of-plane with respect to the basal plane of the crystal structure. In the tetragonal phase at 300 K, a clear stiffening was observed upon doping with Co. Increasing pressure to 4 GPa caused a marked increase of phonon frequencies, with the doped material still stiffer than the parent compound. Upon cooling, both the doped and undoped samples showed a stiffening and the parent compound exhibited a discontinuity across the magnetic and structural phase transitions. These findings are generally compatible with the changes in volume of the system upon doping, increasing pressure, or increasing temperature, but an extra softening of high-energy modes occurs with increasing temperature. First-principles computations of the phonon DOS were performed and showed an overall agreement with the experimental results, but underestimate the Grueneisen parameter. This discrepancy is explained in terms of a magnetic Grueneisen parameter, causing an extra phonon stiffening as magnetism is suppressed under pressure.

  7. Temperature and Pressure Dependence of the Fe-specific Phonon Density of States in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$.

    Energy Technology Data Exchange (ETDEWEB)

    Delaire, Olivier A [ORNL; Lucas, [ORNL; Moreira Dos Santos, Antonio F [ORNL; Subedi, Alaska P [ORNL; Sefat, A. S. [McMaster University; McGuire, Michael A [ORNL; Tulk, Christopher A [ORNL; Singh, David J [ORNL; Sales, Brian C [ORNL; Mandrus, David [ORNL; Egami, Takeshi [ORNL

    2010-01-01

    The {57}Fe-specific phonon density of states of Ba(Fe(1-x)Co(x))2As2 single crystals (x=0.0, 0.08) was measured at cryogenic temperatures and at high pressures with nuclear-resonant inelastic x-ray scattering. Measurements were conducted for two different orientations of the single crystals, yielding the orientation-projected {57}Fe-phonon density of states (DOS) for phonon polarizations in-plane and out-of-plane with respect to the basal plane of the crystal structure. In the tetragonal phase at 300 K, a clear stiffening was observed upon doping with Co. Increasing pressure to 4 GPa caused a marked increase of phonon frequencies, with the doped material still stiffer than the parent compound. Upon cooling, both the doped and undoped samples showed a stiffening, and the parent compound exhibited a discontinuity across the magnetic and structural phase transition. These findings are generally compatible with the changes in volume of the system upon doping, increasing pressure, or increasing temperature, but an extra softening of high-energy modes occurs with increasing temperature. First-principles computations of the phonon DOS were performed and showed an overall agreement with the experimental results, but underestimate the Grueneisen parameter. This discrepancy is explained in terms of a magnetic Grueneisen parameter, causing an extra phonon stiffening as magnetism is suppressed under pressure.

  8. Intervenciones preventivas de la violencia interna en el trabajo: políticas de buenas prácticas y gestión de conflictos Internal violence at work preventive interventions: good practice policies and conflict management

    Directory of Open Access Journals (Sweden)

    Antonia Bernat Jiménez

    2011-01-01

    Full Text Available La violencia interna en el lugar de trabajo es la que tiene lugar entre los trabajadores, incluidos mandos y directivos. Incluye la violencia física, el acoso sexual y el acoso psicológico, abarcando también otras conductas de violencia psicológica diferenciadas de éste. Debe ser considerada como un riesgo psicosocial, que supone un peligro importante para la salud y seguridad de las personas, y tiene repercusiones organizacionales a través de costes directos e indirectos. Considerar la violencia interna con este enfoque de riesgo laboral, supone que su abordaje se ha de realizar aplicando los principios de la acción preventiva, a la vez que permite adoptar estrategias de actuación dirigidas a la prevención del fenómeno. Las principales organizaciones a nivel mundial y nacional proponen la implementación de una política de prevención de la violencia en el lugar de trabajo. Este artículo trata sobre la conveniencia del desarrollo e implementación en las organizaciones de una política de prevención de la violencia interna, de carácter integral e integrado, que involucre a toda la organización, orientada a lograr entornos de trabajo más saludables y con un enfoque centrado en los factores organizativos y psicosociales. En el artículo se contemplan las premisas esenciales de esa política preventiva de la violencia interna, abordándose también los momentos básicos de la estrategia preventiva: - La evaluación de riesgo psicosociales. - La política de buenas prácticas. - Los procedimientos de gestión de conflictos y acoso psicológico en el trabajo. - Las estrategias de comunicación organizacional y las acciones formativas. Para conseguir auténtica efectividad, las políticas de prevención de la violencia interna deben incorporarse al Sistema de Gestión de la Prevención de la organización, que, a su vez, estará integrado en todos los sistemas de gestión restantes de la empresa.Internal violence in the workplace is

  9. Prácticas culturales y gestión del riesgo sísmico: la cultura de las buenas costumbres / Cultural practices and seismic risk management: culture of good habits

    Directory of Open Access Journals (Sweden)

    Lina A. Zambrano-Hernández

    2015-10-01

    Full Text Available Resumen Objetivo: reconocer y comprender las prácticas culturales y sentidos referidos a la gestión del riesgo sísmico de un grupo poblacional que ha vivido diversas situaciones de este tipo, en la ciudad de Manizales, Caldas. Metodología: este estudio se ubicó en el campo de la investigación cualitativa, basado en la micro-etnografía y el análisis cualitativo, asumiendo como fundamento que la investigación de este tipo centra sus análisis en el contexto histórico cultural de las comunidades. Resultados: las prácticas culturales relacionadas con la gestión del riesgo son creaciones de significado que a partir del saber popular se configuran con su particular modelo de internalización cultural frente al fenómeno sísmico. Este proceso de aprendizaje comunitario se soporta a partir de convenciones morales y valores familiares que apremian desde una ideología de prevención y supervivencia, lo que se constituye para dicha comunidad en un hecho legítimo. Por otra parte, se encuentra, la no apropiación simbólica del conocimiento de carácter técnico-científico, situación que genera resistencias comunitarias a la apropiación de los nuevos contenidos, por no sentir un verdadero respeto e inclusión de su tradición cultural. Conclusión: la gestión del riesgo no es sólo la reducción de éste, sino la comprensión social de las prácticas culturales, de conductas y modos de vida (incluso de ideologías y de perspectivas de mundo, de vida, de religión, que en términos sociales, requiere de la participación de los diversos estratos, sectores de interés y grupos representativos, y así, reconocer cómo se construye en colectivo la gestión del riesgo como una cultura de las buenas costumbres./ Abstract Objective: to recognize and understand cultural practices and meanings related to seismic risk management of a community that has lived different situations of this kind in the city of Manizales, Caldas. Methodology: is a

  10. A redução dos riscos dos pesticidas pela protecção integrada

    OpenAIRE

    Amaro, Pedro

    2003-01-01

    Os pesticidas de uso agrícola tiveram grande expansão após a 2.ª Guerra Mundial, graças à descoberta e amplo desenvolvimento e aplicação pelos agricultores dos novos pesticidas organossintéticos. A sua fácil aplicação, o apoio eficiente dos técnicos das empresas de pesticidas e, por vezes, dos serviços oficiais e as evidentes vantagens de maior eficácia e de carácter económico justificam a grande expansão do consumo destes pesticidas a partir dos anos 50, 60 e 70. É bem c...

  11. Sífilis secundaria en cavidad oral: Reporte de dos casos Oral secondary syphilis: Two cases report

    Directory of Open Access Journals (Sweden)

    M G Díaz

    2008-12-01

    Full Text Available La sífilis es una enfermedad infecciosa humana causada por una bacteria: el Treponema pallidum. La enfermedad es transmitida por contacto directo a través de lesiones durante el estadio primario y secundario, por vía transplacentaria intrauterina o a través del canal uterino; puede afectar cualquier órgano de la economía causando un número infinito de presentaciones clínicas. La sífilis secundaria cursa con manifestaciones mucocutáneas características y eventual sintomatología general. La presentación clínica de nuestros dos pacientes es singular ya que solo poseían lesiones en la cavidad oral. La respuesta al tratamiento instaurado fue buena.Syphilis is a human infectious disease caused by the bacterium Treponema pallidum. The disease is transmitted by direct contact with a lesion during the primary or secondary stages, in utero by the transplacental route, or during delivery as the baby passes through an infected canal. The bacterium may infect any organ, causing an infinite number of clinical presentations. Secondary syphilis is characterized by mucocutaneous lesions, a flulike syndrome, and generalized adenopathy. Hepatosplenomegaly may be present. The oral mucosa is the second most frequent site of luetic lesions; the genital areas are the most frequent. In the oral cavity, the most characteristic lesion is a whitish mucosal patch, normally located on the lips, tongue, or palate, which is extremely contagious. The differential diagnosis of this lesion may include oral squamous carcinoma, leukoplakia, candidosis, lichen planus, and hairy oral leukoplakia. Definitive diagnosis is based on clinical information and completed by laboratory examinations even the biopsy can help us. With the diagnosis of secondary syphilis treatment with penicillin G benzathine must be started. We present two cases of secondary syphilis with oral lesions only; the first one, a man with macule covered with a whitish membrane on palate mucosa and a

  12. [FeFe]-hydrogenase models assembled into vesicular structures.

    Science.gov (United States)

    Menzel, Kristin; Apfel, Ulf-Peter; Wolter, Nonio; Rüger, Ronny; Alpermann, Theodor; Steiniger, Frank; Gabel, Detlef; Förster, Stephan; Weigand, Wolfgang; Fahr, Alfred

    2014-03-01

    Compartmentalization is a major prerequisite for the origin of life on earth according to Wächtershäuser "Iron-Sulfur-World". The hypothesis is mainly based on an autocatalytic inorganic energy reproducing redox system consisting of iron and sulfur as requirement for the subsequent synthesis of complex organic structures. Here, we modified [FeFe]-hydrogenase models by means of covalent coupling to either oleic acid or the amphiphilic block copolymer polybutadiene-polyethyleneoxide (PB-PEO) and incorporated those into the membranes of vesicles composed of phospholipids (liposomes) or the unmodified amphiphilic polymer (polymersomes). We employed a [2Fe-2S] cluster as a hydrogenase model, since these structures are known to be suitable catalysts for the generation of H2 in the presence of weak acids. Successful incorporation was confirmed by spectrophotometric iron quantification and the vesicles formed were characterized by size determination (photon correlation spectroscopy (PCS)), and zeta potential as well as by cryo-transmission electron microscopy (Cryo-TEM). The modified models could be incorporated into liposomes or polymersomes up to molar proportions of 3.15% and 28%, respectively. Due to the immobilization in vesicular bilayers the [FeFe]-hydrogenase models can even exhibit catalytic action under the particular conditions of the intravesicular microenvironment. Our results suggest that the vesicular systems described may be applied as a nanoreactor for the reduction of encapsulated substances by generating hydrogen and thus as a minimal cell model.

  13. Isotopic fractionation associated with [NiFe]- and [FeFe]-hydrogenases

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Hui; Gandhi, Hasand; Cornish, Adam J.; Moran, James J.; Kreuzer, Helen W.; Ostrom, Nathaniel; Hegg, Eric L.

    2016-01-30

    Hydrogenases catalyze the reversible formation of H2 from electrons and protons with high efficiency. Understanding the relationships between H2 production, H2 uptake, and H2-H2O exchange can provide insight into the metabolism of microbial communities in which H2 is an essential component in energy cycling. In this manuscript, we used stable H isotopes (1H and 2H) to probe the isotope effects associated with three [FeFe]-hydrogenases and three [NiFe]-hydrogenases. All six hydrogenases displayed fractionation factors for H2 formation that were significantly less than 1, producing H2 that was severely depleted in 2H relative to the substrate, water. Consistent with differences in their active site structure, the fractionation factors for each class appear to cluster, with the three [NiFe]-hydrogenases (α = 0.27-0.40) generally having smaller values than the three [FeFe]-hydrogenases (α = 0.41-0.55). We also obtained isotopic fractionation factors associated with H2 uptake and H2-H2O exchange under conditions similar to those utilized for H2 production, providing us with a more complete picture of the three reactions catalyzed by hydrogenases. The fractionation factors determined in our studies can be used as signatures for different hydrogenases to probe their activity under different growth conditions and to ascertain which hydrogenases are most responsible for H2 production and/or uptake in complex microbial communities.

  14. Comparación bromatológica, microbiológica y sensorial de dos formulaciones de salchichas elaboradas con carne de conejo (Oryctolagus cuniculus

    Directory of Open Access Journals (Sweden)

    José Igor Hleap Zapata

    2014-01-01

    Full Text Available En este estudio se evaluaron dos formulaciones diferentes de salchichas elaboradas con carne de conejo, utilizando como extendedores harina de chontaduro (Bactris gasipaes y almidón modificado de maíz. Ambas formulaciones consistieron en 60% de carne de conejo, 12% de grasa de cerdo y 4% del respectivo extensor, el porcentaje restante correspondió a hielo y condimentos. Los análisis bromatológicos mostraron los contenidos siguientes (base seca: (1 en carne = 60.90% de proteína, 33.65% de grasa, 4.46% de cenizas y 0.99% de carbohidratos; (2 en salchichas elaboradas con adición de harina de chontaduro = 15.96% de proteína, 13.55% de grasa, 4.10% de cenizas, 3.42% de carbohidratos y 60.63% de humedad; y (3 en salchichas elaboradas con adición de almidón modificado de maíz = 14.54% de proteína, 11.53% de grasa, 3.81% de cenizas, 3.99% de carbohidratos y 63.42% de humedad. Las pruebas microbiológicas consistieron en el análisis de los parámetros tradicionales de calidad y seguridad, además de mediciones sensoriales utilizando pruebas afectivas de preferencia, de grado de satisfacción y de aceptación que permitieron concluir que las salchichas elaboradas presentaron características de inocuidad para el ser humano y de gran aceptación gracias a sus buenas propiedades organolépticas, resultando productos tipo Premium según la NTC 1325.

  15. Magnetic properties of Fe/NiO/Fe(001) trilayers

    Energy Technology Data Exchange (ETDEWEB)

    Biagioni, P. [INFM - Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan (Italy)]. E-mail: paolo.biagioni@polimi.it; Brambilla, A. [INFM - Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan (Italy); Portalupi, M. [INFM - Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan (Italy); Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Rougemaille, N. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Schmid, A.K. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Lanzara, A. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Department of Physics, University of California at Berkeley, Berkeley, CA 94720 (United States); Vavassori, P. [INFM - Dipartimento di Fisica, Universita di Ferrara, Via Paradiso 12, 44100 Ferrara (Italy); Zani, M. [INFM - Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan (Italy); Finazzi, M. [INFM - Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan (Italy); Duo, L. [INFM - Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan (Italy); Ciccacci, F. [INFM - Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan (Italy)

    2005-04-15

    We have investigated the magnetic properties of epitaxially grown Fe/NiO/Fe(001) trilayers, for different thicknesses of the NiO spacer. Magneto Optical Kerr Effect has been exploited to study the in-plane magnetization reversal processes in the iron layers. We found that the NiO thickness t{sub AFM} has a critical value t{sub C} for the magnetic coupling between the Fe layers: for t{sub AFM}

  16. Perspectivas para a pesquisa em contabilidade: o impacto dos derivativos

    Directory of Open Access Journals (Sweden)

    Alexsandro Broedel Lopes

    2001-08-01

    Full Text Available Este artigo analisa o impacto dos instrumentos financeiros derivativos para a pesquisa em contabilidade. O impacto dos derivativos é grande independentemente da linha de pesquisa adotada. Dentro do paradigma do mercado de capitais, o papel dos derivativos como antecipadores do comportamento futuro dos preços fornece oportunidades interessantes de investigação, por exemplo. Na linha de pesquisa institucional e social o tratamento contábil de tais instrumentos é visualizado tendo-se por base a busca por poder e legitimização da profissão. As características operacionais dos produtos, ambiente de regulamentação, evolução tecnológica e outros aspectos característicos fazem desses produtos bases promissoras para investigações futuras.This paper investigates the role of derivative financial instruments for the future of financial accounting research. This impact is relevant what all major research paradigms are concerned. In capital market-based research, derivative instruments play a central role in price discovery. From the institutional and social points-of-view, derivatives are components of a greater quest for legitimization and power. Their operational features, regulatory environment, technological advances and other characteristics are turning derivatives into promising research venues.

  17. Influence of an Fe cap layer on the structural and magnetic properties of Fe49Pt51/Fe bi-layers

    Institute of Scientific and Technical Information of China (English)

    Duan Chao-Yang; Ma Bin; Wei Fu-Lin; Zhang zong-Zhi; Jin Qing-Yuan

    2009-01-01

    The influences of an Fe cap layer on the structural and magnetic properties of FePt/Fe bi-layers are investigated.Compared with single FePt alloy films, a thin Fe layer can affect the crystalline orientation and improve the chemical ordering of L10 FePt films. Moreover, the coercivity increases when a thin Fe layer covers the FePt layer. Beyond a critical thickness, however, the Fe cover layer quickens the magnetization reversal of Fe49Pt51/Fe bi-layers by their exchange coupling.

  18. Electrocatalytic activity of porous nanostructured Fe/Pt-Fe electrode for methanol electrooxidation in alkaline media

    Institute of Scientific and Technical Information of China (English)

    Javad Hosseini; Mehdi Abdolmaleki; Hamid Reza Pouretedal; Mohammad Hossein Keshavarz

    2015-01-01

    An electrochemical approach to fabricate a nanostructured Fe/Pt-Fe catalyst through electrodepo-sition followed by galvanic replacement is presented. An Fe/Pt-Fe nanostructured electrode was prepared by deposition of Fe-Zn onto a Fe electrode surface, followed by replacement of the Zn by Pt at open-circuit potential in a Pt-containing alkaline solution. Scanning electron microscopy and energy-dispersive X-ray techniques reveal that the Fe/Pt-Fe electrode is porous and contains Pt. The electrocatalytic activity of the Fe/Pt-Fe electrode for oxidation of methanol was examined by cyclic voltammetry and chronoamperometry. The electrooxidation current on the Fe/Pt-Fe catalyst is much higher than that on flat Pt and smooth Fe catalysts. The onset potential and peak potential on the Fe/Pt-Fe catalyst are more negative than those on flat Pt and smooth Fe electrodes for methanol electrooxidation. All results show that this nanostructured Fe/Pt-Fe electrode is very attractive for integrated fuel cell applications in alkaline media.

  19. Microminerais para bovinos de corte nas pastagens nativas dos Campos de Cima da Serra, RS, Brasil

    Directory of Open Access Journals (Sweden)

    Wunsch Carolina

    2005-01-01

    Full Text Available Em face das poucas informações disponíveis sobre a composição mineral das pastagens nativas da região dos Campos de Cima da Serra (RS, o presente trabalho de pesquisa objetivou avaliar os teores dos principais microminerais, em diferentes épocas do ano, e relacionar o perfil mineral destas pastagens com as necessidades nutricionais recomendadas pelo NRC (1996 para bovinos de corte. O projeto foi conduzido em vinte propriedades particulares, em Cambará do Sul, utilizando áreas de campo nativo que estavam sendo normalmente utilizadas em pastoreio por bovinos de corte e/ou ovinos, e que não tinham sofrido nenhum tipo de melhoria, reforma ou recuperação (exceto queimada, no mínimo nos últimos 20 anos. Colheram-se nas diversas estações, durante um ano, e dentro de uma mesma área predeterminada em cada propriedade, amostras para determinar as concentrações de ferro, manganês, cobre e zinco. Verificou-se efeito do mês de coleta sobre todos os minerais analisados. Constataram-se teores suficientes de Mn e Fe para todas as categorias de bovinos de corte analisadas. Entretanto, algumas amostras apresentaram níveis tóxicos aos animais. Os teores de Cu não são suficientes para todas as categorias de bovinos em alguns meses do ano. Os teores de Zn estiveram abaixo das exigências mínimas para bovinos de corte.

  20. Micetoma pulmonar por Scedosporium sp, reporte de dos casos

    Directory of Open Access Journals (Sweden)

    José G. Somocurcio

    2009-07-01

    Full Text Available Se reporta los dos primeros casos de micetoma pulmonar por Scedosporium sp, en el Perú, tratados quirúrgicamente en el Hospital Nacional Hipólito Unanue. Se practicó resección pulmonar debido a micetoma pulmonar de donde se tomó muestras que fueron enviadas a microbiología y anatomía patológica para cultivo y estudio histopatológico. Se identificó el moho Scedosporium sp en dos pacientes con secuelas cavitarias por tuberculosis, quienes presentaron tos y hemoptisis de dos meses y tres años de evolución, respectivamente. Radiológicamente las cavidades estaban ocupadas por una "bola fúngica". La histopatología indicó presencia de abundantes hifas, indistinguibles de las de Aspergillus sp, mientras que la inmunodifusión para Aspergillus fue negativa.

  1. o caso dos produtos turísticos

    OpenAIRE

    Martins, Carmen Luisa Palhau

    2013-01-01

    Dissertação apresentada à Universidade Fernando Pessoa como parte dos requisitos de obtenção do grau de Mestre em Ciências da Comunicação, Ramo de Marketing e Publicidade A presente dissertação de mestrado tem como tema A Influência da Internet no Processo de Decisão de Compra do Consumidor, em específico o estudo de caso dos produtos turísticos. O objectivo geral é procurar entender a influência da internet no processo de decisão de compra no caso específico dos produtos turísticos onl...

  2. Para o estudo da denominação dos conjuntos em português – Aspectos morfo-semânticos dos nomes dos colectivos

    Directory of Open Access Journals (Sweden)

    Margarita Correia

    1999-08-01

    Full Text Available Com este artigo pretendo contribuir para o estudo da denominação dos conjuntos em português europeu. No entanto, ele não pode ser considerado um trabalho exaustivosobre este tema. Dado considerar a estrutura das palavras fundamental para a compreensão do seu significado e uso, prestarei particular atenção a este aspecto dos substantivoscolectivos.Em primeiro lugar, exporei de modo breve o conceito de substantivo colectivo, tendo em especial atenção Cunha & Cintra (1984. Em seguida, descreverei os diferentes tipos de estruturas morfológicas das palavras que podem apresentar acepções colectivas. Finalmente listarei os sufixos envolvidos na construção de substantivos colectivos denominais em português.

  3. TENDÊNCIAS DOS ESTUDOS COM PLANTAS MEDICINAIS NO BRASIL

    OpenAIRE

    Fernanda Melo Carneiro; Maria José Pereira da Silva; Leonardo Luiz Borges; Lorena Carneiro Albernaz,; Joana Darc Pereira Costa

    2014-01-01

    As plantas medicinais são utilizadas pelo homem desde o início da história e atualmente empregadas como recursos na medicina alternativa por grande parte da população mundial. Esse uso deve-se à facilidade de acesso às plantas em relação aos medicamentos alopáticos. O objetivo deste trabalho foi, primariamente, desenvolver uma análise cienciométrica sobre as tendências dos estudos com plantas medicinais no Brasil, investigando se o número de trabalhos cresceu ao longo dos anos. Além disso, f...

  4. O uso dos audiovisuais como recurso didáctico

    OpenAIRE

    Ferreira, Eurico Costa

    2010-01-01

    Tendo em conta que a sociedade actual se rege por uma cultura tecnológica e audiovisual, o aproveitamento dos meios audiovisuais para serem usados como recursos didácticos nas escolas tem uma dupla função. Permite por um lado enquadrar o sistema de ensino nas exigências da nova sociedade, e por outro, criar um ambiente mais próximo do quotidiano dos alunos, tornando a sala de aula num local com uma ambiente mais motivador. No geral, este estudo apresenta os aspectos metodológicos da investiga...

  5. ENSEÑAR Y APRENDER CON TECNOLOGÍAS: UN MODELO TEÓRICO PARA LAS BUENAS PRÁCTICAS EDUCATIVAS CON TIC TEACHING AND LEARNING WITH TECHNOLOGY: A THEORETICAL MODEL FOR GOOD EDUCATIONAL PRACTICES WITH ICT

    Directory of Open Access Journals (Sweden)

    Jesús Valverde Berrocoso

    2010-02-01

    Full Text Available Este artículo tiene como objetivo definir un marco teórico explicativo de la integración de las tecnologías de la información y la comunicación (TIC en el sistema educativo, desde la perspectiva de la formación del profesorado. Esta formación inicial y continua de los docentes se caracteriza por una tendencia hacia la “esencialización” de la tecnología y la generación de usuarios que no suelen reflexionar sobre los usos educativos de la propia tecnología en contextos flexibles y variables. Nuestra investigación sobre la integración de las TIC en las aulas nos ha permitido observar la falta de conexión entre los usos personales y profesionales de los profesores de estas herramientas tecnológicas, así como la necesidad de que su formación se oriente hacia el desarrollo de conocimientos y habilidades para examinar, de manera crítica, las implicaciones educativas de estos nuevos medios didácticos. Partimos de la propuesta de Koehler y Mishra (2005; 2006; 2007 y 2008 denominada TPCK (Technological Pedagogical Content Knowledge que se fundamenta en el constructo PCK de Shulman (1987 al que se añade el concepto de “Tecnología” (T, a los de “Pedagogía” (P y “Contenido Curricular” (C. Las conexiones e interacciones dinámicas entre estos tres componentes esenciales da lugar a diferentes componentes que han de ser considerados en la comprensión de los procesos de integración de las TIC en los centros educativos. Las buenas prácticas educativas con TIC son acciones complejas y multidimensionales que exigen (1 comprender la representación y formulación de conceptos y procedimientos para su comprensión a través de las TIC; (2 desarrollar estrategias didácticas constructivistas que usen las TIC para la enseñanza de contenidos curriculares; (3 conocer las dificultades en el aprendizaje de conceptos y de qué forma las TIC pueden ayudar a superarlas y (4 conocer el conocimiento previo de los alumnos, así como la

  6. Preparation of DyFe2 and TbFe2 by Reduction-Diffusion Process

    Institute of Scientific and Technical Information of China (English)

    Guangsi GUO; Guangtai WANG; Zhitong SUI

    2004-01-01

    The pure intermetallic compounds (Tb1-xDyx)Fe2 are super-magnetostriction materials, which were produced from DyFe2and TbFe2 in this paper. The thermodynamic possibility and kinetic feasible conditions for DyFe2 and TbFe2 preparation by reduction-diffusion in Ca-Dy2O3-Fe and Ca-Tb4O7-Fe systems were analyzed and the products of DyFe2 and TbFe2 were confirmed by XRD. The contracting core model was applied to describe the reduction-diffusion process in which the diffusion is a rate-controlled step. The apparent activation energies of DyFe2 and TbFe2 processes are 45 and 39 k J/mol respectively.

  7. Thermodynamics of Fe(II)Fe(III) oxide systems I. Hydrothermal Fe3O4

    Science.gov (United States)

    Bartel, J.J.; Westrum, E.F.; Haas, J.L.

    1976-01-01

    The heat capacity of a hydrothermally-prepared polycrystalline sample of Fe3O4 was measured from 53 to 350 K, primarily to study the thermophysics of the Verwey transitions. Although the bifurcation of the transition was confirmed, the sample was found to contain traces of manganese. The observed transition temperatures of 117.0 and 123.0 K are 3.7 and 4.2 K higher respectively than those found in pure Fe3O4. Ancillary analytical results are consistent and indicate a stoichiometry of Mn0.008Fe2.992O4 for this material. Characteristics in the transition region are ascribed to dopant effects. ?? 1976.

  8. Spin structure of exchange biased heterostructures. Fe/MnF{sub 2} and Fe/FeF{sub 2}

    Energy Technology Data Exchange (ETDEWEB)

    Sahoo, B.

    2006-12-18

    In this work, the {sup 57}Fe probe layer technique is used in order to investigate the depth- and temperature-dependent Fe-layer spin structure of exchange biased Fe/MnF{sub 2} and Fe/FeF{sub 2} (pseudo-twinned) antiferromagnetic (AFM) systems by conversion electron Moessbauer spectroscopy (CEMS) and nuclear resonant scattering (NRS) of synchrotron radiation. Two kinds of samples with a 10 A {sup 57}Fe probe layer directly at or 35 A away from the interface, labeled as interface and center sample, respectively, were studied in this work. The results obtained by CEMS for Fe/MnF{sub 2} suggests that, at 80 K, i.e., above T{sub N}=67 K of MnF{sub 2}, the remanent state Fe-layer spin structure of the two studied samples are slightly different due to their different microstructure. In the temperature range from 300 K to 80 K, the Fe-layer spin structure does not change just by zero-field cooling the sample in remanence. For Fe/FeF{sub 2}, a continuous non-monotonic change of the remanent-state Fe spin structure was observed by cooling from 300 K to 18 K. NRS of synchrotron radiation was used to investigate the temperature- and depth-dependent Fe-layer spin structure during magnetization reversal in pseudo-twinned Fe/MnF{sub 2}. A depthdependent Fe spin structure in an applied magnetic field (applied along the bisector of the twin domains) was observed at 10 K, where the Fe spins closer to the interface are not aligned along the field direction. The depth-dependence disappears at 150 K. (orig.)

  9. Magnetic behavior of chemically synthesized FePt-FeRh nanostructures

    Energy Technology Data Exchange (ETDEWEB)

    Jia, Z. [Center for Structural and Functional Materials, University of Louisiana at Lafayette, P.O. Box 44130, Lafayette, LA 70504 (United States); Seetala, N. [Physics Department, Grambling State University, Grambling, LA 71245 (United States); Misra, R.D.K., E-mail: dmisra@louisiana.ed [Center for Structural and Functional Materials, University of Louisiana at Lafayette, P.O. Box 44130, Lafayette, LA 70504 (United States)

    2010-05-01

    We describe here the chemical synthesis and magnetization behavior of FeRh-FePt nanostructures fabricated using a two-step procedure. The first step involved chemical synthesis of FeRh nanoparticles using a polyol co-reduction process accompanied by the second stage of encapsulation of FeRh nanoparticles with FePt. The FeRh-FePt nanoparticles were subsequently annealed in a salt matrix at 600 deg. C for 3 h. Magnetic measurements were made on films of FeRh-FePt nanostructures cast onto silicon wafers before and after the salt matrix annealing. The coercivity of as-synthesized FeRh-FePt nanostructures was approx70 Oe at room temperature, while the coercivity of salt-matrix annealed FeRh-FePt nanoparticles was approx7065 Oe. The temperature dependent magnetization measurement of annealed FeRh-FePt nanostructures indicated antiferromagnetic-ferromagnetic transition that is supported by X-ray diffraction study. The observations point toward the potential realization of FeRh-FePt nanostructures for ultra-high density magnetic recording media.

  10. Dos realidades: dos maneras de habitar conviven hoy en la ciudad

    Directory of Open Access Journals (Sweden)

    Carmen Faría Larrazábal

    2007-01-01

    Full Text Available Maracaibo, centro de explotación petrolera en Venezuela, desde el siglo XVII organizó su estructura urbana mediante la cuadrícula tradicional española, cuyo tejido presentaba un grano uniforme. La dinámica de crecimiento del siglo XX aportó configuraciones diferentes: las Villas Cerradas, las cuales incorporan paradigmas que dibujan un nuevo orden espacial. El trabajo aborda dos aspectos estrechamente vinculados: por un lado, la solución habitacional ofertada a grupos socioeconómicos de niveles medio y medio-alto, y por otro, cómo estos desarrollos establecen nuevos patrones en el quehacer urbano, y nuevos códigos y significados a la memoria colectiva de sus ciudadanos. Se revisa el statu quo de la acción planificadora y constructiva de la vivienda y se presentan nuevas experiencias realizadas en la década de los 90, las cuales a través de su arquitectura de grandes murallas expresan la autoprotección y el control disciplinario de las relaciones sociales. La investigación utiliza el análisis documental, planimétrico y la observación directa de los fenómenos urbanos como instrumentos de ayuda para dibujar los cambios producidos; lo cual será útil tanto para la comprensión de los procesos y su teorización crítica, como para la enseñanza, el ejercicio de la profesión y la planificación de la ciudad

  11. Glucogenosis tipo I: reporte de dos casos en dos hermanos de Cartagena de Indias-Colombia

    Directory of Open Access Journals (Sweden)

    Alvear-Sedán Ciro

    2011-09-01

    Full Text Available CASO CLÍNICO: # 1. Producto del primer embarazo de padres no consanguíneos, con lactancia hasta los dos años. A los 18 meses deedad presentó distensión abdominal, hepatomegalia difusa no dolorosa, diarrea de mes y medio, debilidad generalizada, edemaprogresivo en cara y pies, anasarca y anemia. Vesícula, bazo y riñones normales y examen neurológico sin alteraciones. Nopresentó hipoglucemia, ácido láctico normal. Pruebas hepáticas alteradas; colesterol, triglicéridos y ácido úrico en el límitesuperior normal. Nunca convulsionó y los síntomas remitieron a los cinco años de edad. Actualmente tiene 14 años y su examenfísico es normal, con talla y peso acorde a la edad. # 2. Producto del segundo embarazo, hermano del anterior, con lactancia hastalos dos años. A los 11 meses de edad presentó cianosis generalizada sin otra sintomatología. Se descartó patología cardiaca. A losdos años presentó cuadro de un mes con distensión abdominal, pérdida de peso, astenia, adinamia, palidez generalizada,hepatomegalia, ascitis, hiperbilirrubinemia mixta con predominio de la directa. Presentó anemia. leucocitos, plaquetas, TP, TPT,proteinograma y glucemia normales. Serologías para hepatitis B negativa. Tamizaje metabólico normal. A los cuatro años presentócrisis tónico-clónica generalizada asociada a vómitos y hepatomegalia homogénea de 5 cm. TAC normal. Edad ósea retardada dedos y medio años, glucemia en ayunas de 31 mg/dL, colesterol, triglicéridos, ácido urico, LDH, AST y FAL elevados. Recibía dieta queincluía maizena antes de acostarse. A los cinco años, biopsia hepática: PAS positivo con cambios compatibles con glicogenosis tipoI. Presentó hematuria persistente, con períodos de hipoglucemia intermitente asintomática. Presentó nefromegalia. A partir de los9 años ha disminuido la hepatomegalia y nefromegalia; tuvo fractura brazo izquierdo con mala consolidación. Actualmente tiene11 años, talla baja de 120 cm

  12. A temperature dependent tunneling study of the spin density wave gap in EuFe2As2 single crystals.

    Science.gov (United States)

    Dutta, Anirban; Anupam; Hossain, Z; Gupta, Anjan K

    2013-09-18

    We report temperature dependent scanning tunneling microscopy and spectroscopy measurements on single crystals of EuFe2As2 in the 15-292 K temperature range. The in situ cleaved crystals show atomic terraces with homogeneous tunnel spectra that correlate well with the spin density wave (SDW) transition at a temperature, TSDW ≈ 186 K. Above TSDW the local tunnel spectra show a small depression in the density of states (DOS) near the Fermi energy (EF). The gap becomes more pronounced upon entering the SDW state with a gap value ∼90 meV at 15 K. However, the zero bias conductance remains finite down to 15 K indicating a finite DOS at the EF in the SDW phase. Furthermore, no noticeable change is observed in the DOS at the antiferromagnetic ordering transition of Eu(2+) moments at 19 K. PMID:23962901

  13. Magnetic properties of Fe/FeSi2/Fe3Si trilayered films prepared by facing targets sputtering deposition

    Science.gov (United States)

    Ishibashi, Kazuya; Nakashima, Kazutoshi; Sakai, Ken-Ichiro; Yoshitake, Tsuyoshi

    2015-09-01

    Whereas giant magnetoresistance and tunnel magnetoresistance films generally employ nonmagnetic metal and insulator spacers, respectively, we have studied Fe3Si/FeSi artificial lattices, in which FeSi2 is semiconducting and its employment as spacers is specific to our research. For the formation of parallel/antiparallel alignments of layer magnetizations, the employment of ferromagnetic layers with different coercive forces is required. There have been few studies on the fabrication of Fe-Si system spin valves comprising ferromagnetic layers with different coercive forces. In this work, Fe3Si and Fe were employed as ferromagnetic layer materials with different coercive forces. Fe/FeSi2/Fe3Si trilayered spin valve junctions by facing targets direct-current sputtering deposition combined with a mask method, and their electrical and magnetic properties were studied. An Fe3Si layer was epitaxially grown on Si(111) substrate as a bottom layer. After that, An Fe layer with a large coercive force was deposited as a top layer, posterior to a FeSi2 layer being deposited. From magnetization curves measured by a vibrating sample magnetometer, it was confirmed that the parallel and antiparallel magnetization alignments of ferromagnetic layers are clearly realized. This work was supported by JSPS KAKENHI Grant Number 15K21594.

  14. Determinação dos teores de minerais em sucos de frutas por espectrometria de emissão óptica em plasma indutivamente acoplado (ICP-OES

    Directory of Open Access Journals (Sweden)

    MORGANO Marcelo Antônio

    1999-01-01

    Full Text Available Dois métodos de preparação de amostra para determinação de minerais em suco de uva foram comparados: extração com ácido clorídrico a frio com agitação e digestão em sistema fechado, sob pressão, empregando-se energia de microondas. As concentrações dos minerais foram obtidas empregando-se a técnica de Espectrometria de Emissão Óptica em Plasma Indutivamente Acoplado (ICP-OES. Os teores dos minerais Ca, P, Na, K, Mg, Zn, Fe, Mn e Cu não diferiram significativamente ao nível de 5% (Teste F para as duas metodologias empregadas. A precisão e exatidão dos métodos foi avaliada usando o suco de uva. A metodologia de extração com ácido clorídrico foi empregada para a determinação dos teores de minerais em sucos processados de abacaxi, acerola, caju, goiaba, manga, maracujá e uva. Para facilitar a interpretação dos teores dos minerais encontrados, foram utilizadas as técnicas de Análise por Componentes Principais (PCA e Análise Hierárquica por Agrupamento (HCA.

  15. Calculated oscillation periods of the interlayer coupling in Fe/Cr/Fe and Fe/Mo/Fe sandwiches

    DEFF Research Database (Denmark)

    Mirbt, S.; Niklasson, A.M.N.; Johansson, B.;

    1996-01-01

    We have performed an ab initio study of the oscillation periods of the interlayer coupling in sandwiches of [100] layers of body centered cubic Cr, respectively, Mo, with up to 20 monolayers thickness embedded in an Fe host. Our derived values for the oscillation periods of the interlayer couplin...

  16. CNOOC Cooperates with Santa Fe

    Institute of Scientific and Technical Information of China (English)

    Cao Sanyong; Wang Keyu

    1997-01-01

    @@ China National Offshore Oil Corporatian (CNOOC) signed the Petroleum Contract for 15/34 Block in the Pearl River Mouth Basin of South China Sea and the Petroleum Contract for 23/28 Block in the Beibu Gulf of South China Sea with Santa Fe Resources Inc. of the United States in Beijing on January 16, 1997.

  17. O reconhecimento dos direitos dos povos indígenas sob a perspectiva internacional e a brasileira

    OpenAIRE

    MARIANA YOKOYA SIMONI

    2009-01-01

    O objetivo da presente análise é descrever,

    brevemente, o surgimento e a evolução do tema

    dos direitos dos povos indígenas na agenda de

    organizações internacionais – como a Organização

    Internacional do Tra...

  18. Análise dos modelos de “governance” e práticas dos portos Portugueses

    OpenAIRE

    Pereira , Ana Filipa Correia

    2014-01-01

    Portugal é um país rico em potencial económico marítimo, para o desenvolvimento de quaisquer atividades que tenham no mar a sua base. Atualmente, o transporte marítimo está a deslocar-se para outras regiões do mundo, nomeadamente a bacia do pacífico, sendo estas consideradas atualmente como as mais competitivas. Assim, o estudo dos modelos e práticas destas regiões poderão gerar um contributo para a inovação dos portos portugueses, tratando-se de um desafio para o setor portuá...

  19. Reductive sequestration of chromate by hierarchical FeS@Fe(0) particles.

    Science.gov (United States)

    Du, Jiangkun; Bao, Jianguo; Lu, Chenghang; Werner, David

    2016-10-01

    Nanoscale Fe(0) (nFe(0)) can detoxify Cr(VI)-bearing wastewater and groundwater, but rapid passivation is a negative factor for large-scale remediation applications. In this study, a magnetic FeS@Fe(0) hybrid material was fabricated by immobilization of iron sulfide (FeS) onto Fe(0) particles to improve the Cr(VI) removal capacity. The solid characterization confirmed that Fe(0) particles were encapsulated by amorphous iron monosulfide. The Cr(VI) uptake by FeS@Fe(0) hybrid particles was found to follow pseudo-second-order rate kinetics, and the Langmuir isotherm was most appropriate to describe Cr(VI) sorption. Meanwhile, the FeS@Fe(0) hybrid particles showed a much higher efficiency towards Cr(VI) sequestration compared to individual nFe(0). Moreover, the results of batch experiments with various adsorbent doses indicated that the reactivity of FeS@Fe(0) varies with different FeS-to-Fe(0) molar ratios. The reaction rate constants for Cr(VI) removal first increased with an increasing FeS-to-Fe(0) ratio from 0/1 to 1/9, and then decreased for the FeS-to-Fe(0) ratio increased further 1/5 or 1/3. For environmental parameters, there was a negative effect of increasing the solution pH and dissolved oxygen on Cr(VI) removal. Furthermore, a mechanistic analysis revealed that Cr(VI) reduction occurred predominantly at the solid-liquid interface, and that Fe(II) regenerated from FeS@Fe(0) corrosion may account for 52% of the Cr(VI) reduction, while electrons from Fe(0) and FeS account for the rest. After treatment, Cr(VI) was completely transformed and immobilized as solid Fe-Cr hydroxide precipitates, thus avoiding secondary contamination. The FeS@Fe(0) hybrid material has a better potential for treating Cr(VI)-bearing wastewater than nano Fe(0). PMID:27322748

  20. Phase daigram for Zr-Fe system

    International Nuclear Information System (INIS)

    Based on the analysis of literary data and results of author's experimental investigations a generalized Zr-Fe state diagram, differing from the one given in the reference book is constructed. Three-phase equlibrium temperatures are averaged by all literary data available and phase solubility boundaries are averaged as well. Crystallographic characteristics of ZrFe2, Zr2Fe an Zr3Fe compounds are presented

  1. Huancayo y Jauja, dos ciudades, una rivalidad y un destino en el Mantaro

    Directory of Open Access Journals (Sweden)

    Jorge Burga Bartra

    2011-12-01

    Full Text Available El valle del Mantaro acoge un rosario de pueblos unidos por vías en ambas márgenes, que están coronados en sus dos extremos por las ciudades de Huancayo y Jauja. La margen izquierda es la más desarrollada, con ciudades importantes como Jauja, Concepción y la propia Huancayo, que se expande dominantemente en esa margen, uniéndose con los pueblos vecinos de San Agustín de Cajas y San Jerónimo de Tunán, hasta llegar a Concepción. Falta poco para que se consolide sobre ese lado una gran ciudad lineal de un extremo al otro. En realidad el 95% de la población de todo el valle se asienta sobre la margen izquierda, más plana y extendida. Mientras en la margen derecha, más angosta y empinada, se suceden pueblitos como Huaripampa, Muquiyauyo, Sincos, Mito y Orcotuna, menos tocados por la fiebre comercial y el desarrollo, pero más preservados. Las dos carreteras paralelas se unen pasando y, sin entrar a Jauja, dirigiéndose en una sola vía hacia La Oroya, y por el otro extremo la ruta desde Huancayo se dirige hacia Huancavelica. Esa es la imagen actual, pero, muchos siglos atrás, se piensa que el valle fue un gran lago que terminó desaguando por la quebrada de Izcuchaca en Huancayo, quedando un valle regado por un río. Antes de la llegada de los españoles, los valles eran ocupados por la población en las cabeceras de los ríos, como en Cajamarca y Cuzco. El valle del Mantaro no es la excepción, y los iniciales asentamientos se dieron en Jauja, cerca al río que antiguamente llevó el mismo nombre. Edgardo Rivera Martínez, en su libro “Imagen de Jauja”, hace un exhaustivo recorrido sobre las opiniones de muchos escritores, políticos, militares y viajeros, desde la época colonial, sobre este lugar, que siendo capital, tenía como distritos a Jauja, Mito Chupaca, Huancayo, y Concepción. Los adjetivos sobre las bondades de su paisaje, su clima, su producción minera, agropecuaria, y su población son innumerables. Jauja era un

  2. Stealth-MITM DoS Attacks on Secure Channels

    CERN Document Server

    Herzberg, Amir

    2009-01-01

    We define stealth Man-in-the-Middle adversaries, and analyse their ability to launch denial and degradation of service (DoS) attacks on secure channels. We show realistic attacks, disrupting TCP communication over secure VPNs using IPsec. We present: First amplifying DoS attack on IPsec, when deployed without anti-replay window. First amplifying attack on IPsec, when deployed with a `small' anti-replay window, and analysis of `sufficient' window size. First amplifying attack on IPsec, when deployed with `sufficient' window size. This attack (as the previous) is realistic: attacker needs only to duplicate and speed-up few packets. We also suggest a solution designed to prevent the presented attacks, and to provide secure channel immune to degradation and other DoS attacks. Our solution involves changes (only) to the two gateway machines running IPsec. In addition to their practical importance, our results also raise the challenge of formally defining secure channels immune to DoS and degradation attacks, and p...

  3. DOS VALORES INDIVIDUALISTAS AOS CAMINHOS DE SUPERAÇÃO

    Directory of Open Access Journals (Sweden)

    Róber Iturriet Avila

    2014-08-01

    Full Text Available 800x600 Normal 0 21 false false false PT-BR X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} Este artigo se propõe averiguar as fontes dos valores individualistas na sociedade contemporânea. Para tanto, eles serão analisados por dois fatos geradores; i pela influência dos intelectuais nestes valores e; ii pelo condicionamento dos homens diante do arranjo econômico. Pauta ainda este trabalho as maneiras de mitigar tais valores, no tempo em que se gestam valores coletivistas. Este papel é analisado a partir de dois prismas i pelo papel dos intelectuais na formação de valores; ii a partir do sistema educacional que os potencialize. Assim, este trabalho versa, adicionalmente, sobre como a educação formal pode ter um papel importante na transformação cultural de uma sociedade.

  4. Dos nuevas especies de Acalypha L. (Euphorbiaceae de Venezuela

    Directory of Open Access Journals (Sweden)

    Cardiel, José María

    1999-06-01

    Full Text Available Two new species of the genus Acalypha L. are described and illustrated, A. longipetiolata and A. venezuelica. Comments on the differences between these and related species are included.Se describen e ilustran dos nuevas especies del género Acalypha L., A. longipetiolata y A. venezuelica, descritas sobre material venezolano; se comentan las principales diferencias con las especies afines

  5. O número dos nomes em português

    Directory of Open Access Journals (Sweden)

    Clóvis Barleta de Morais

    2001-02-01

    Full Text Available

    Sistematização do estudo do número dos substantivos e adjetivos em português com base na pronúncia (fonologia, e não na ortografia, como se faz geralmente. Apresentação de listas de palavras que constituem exceções.

  6. Empreededorismo social: caso da 'cidade dos meninos' Belo Horizonte - Brasil

    Directory of Open Access Journals (Sweden)

    Walter Marinho de Oliveira

    2010-09-01

    Full Text Available A Cidade dos Meninos de São Vicente de Paulo, é uma das mais ousadas e completas abordagens no enfrentamento do problema dos menores de rua no Brasil. Este artigo, descreve a experiência da “Cidade dos Meninos” e de seu idealizador, apoiando-se em teorias recentes sobre empreendedorismo social. Atenção especial é dada à definição de empreendedor social catalítico (WADDOCK; POST, 1991, relacionando a atuação da liderança da Cidade dos Meninos a esse perfil. Uma das possíveis conclusões é que, em países em desenvolvimento como o Brasil, o empreendedor social catalítico não pode exercer apenas a função de criador e implementador de políticas, face a dimensão da carência e do problema com o qual ele se confronta, envolvendo-se então na ação direta

  7. Emprego dos gangliosidos do cortex cerebral nas neuropatias perifericas

    Directory of Open Access Journals (Sweden)

    James Pitagoras De Mattos

    1981-12-01

    Full Text Available Os autores registram a experiência pessoal com o emprego de gangliosídios do cortex cerebral nas neuropatias periféricas. O ensaio clínico e eletromiográfico revelou-se eficaz em 30 dos 40 casos tratados. Enfatizam os melhores resultados em casos de paralisias faciais periféricas.

  8. Atom exchange between aqueous Fe(II) and structural Fe in clay minerals.

    Science.gov (United States)

    Neumann, Anke; Wu, Lingling; Li, Weiqiang; Beard, Brian L; Johnson, Clark M; Rosso, Kevin M; Frierdich, Andrew J; Scherer, Michelle M

    2015-03-01

    Due to their stability toward reductive dissolution, Fe-bearing clay minerals are viewed as a renewable source of Fe redox activity in diverse environments. Recent findings of interfacial electron transfer between aqueous Fe(II) and structural Fe in clay minerals and electron conduction in octahedral sheets of nontronite, however, raise the question whether Fe interaction with clay minerals is more dynamic than previously thought. Here, we use an enriched isotope tracer approach to simultaneously trace Fe atom movement from the aqueous phase to the solid ((57)Fe) and from the solid into the aqueous phase ((56)Fe). Over 6 months, we observed a significant decrease in aqueous (57)Fe isotope fraction, with a fast initial decrease which slowed after 3 days and stabilized after about 50 days. For the aqueous (56)Fe isotope fraction, we observed a similar but opposite trend, indicating that Fe atom movement had occurred in both directions: from the aqueous phase into the solid and from the solid into aqueous phase. We calculated that 5-20% of structural Fe in clay minerals NAu-1, NAu-2, and SWa-1 exchanged with aqueous Fe(II), which significantly exceeds the Fe atom layer exposed directly to solution. Calculations based on electron-hopping rates in nontronite suggest that the bulk conduction mechanism previously demonstrated for hematite1 and suggested as an explanation for the significant Fe atom exchange observed in goethite2 may be a plausible mechanism for Fe atom exchange in Fe-bearing clay minerals. Our finding of 5-20% Fe atom exchange in clay minerals indicates that we need to rethink how Fe mobility affects the macroscopic properties of Fe-bearing phyllosilicates and its role in Fe biogeochemical cycling, as well as its use in a variety of engineered applications, such as landfill liners and nuclear repositories.

  9. The Nature of Line Broadening in Thermally Detected 57FeFe NMR

    International Nuclear Information System (INIS)

    57FeFe with isotopic concentrations from 15 to 95% is studied using NMR thermally detected by nuclear orientation. Lines are found to be consistently homogeneous. The contrast with previous inhomogeneous 57FeFe lines from Moessbauer detected NMR is explained by differences in radio frequency field strength.

  10. Estudo dos elementos celulares na medula humana dos adultos I. linhagem plasmocitária

    Directory of Open Access Journals (Sweden)

    M. R. Q de Kastner

    1972-01-01

    Full Text Available Examinando o conjunto dos resultados obtidos nesta pesquisa e os dados pela literatura, observamos que o aumento numérico de células plasmáticas na medula óssea é um fenômeno relativamente freqüente. Todo hematologista habituado pode facilmente fazer o diagnóstico do estado da célula plasmocitária pela sua morfologia, seu tamanho e sua coloração. Nos quadros mais proeminentes de predominância de células de linhagem plasmocitária, os exames hematológicos e clínicos aliados ao mielograma, auxiliarão no diagnóstico do plasmocitoma. A nosso ver, os sinais (qualitativos, distintivos, de natureza citológica, que aparecem nos mielogramas no caso de plasmocitoma são: a Pleomorfismo e dismorfismo na célula plasmática; b "Rouleaux" de hemácias, já visível no hemograma; c Aumento das dimensões de alguns metamielócitos e bastonetes, acompanhados geralmente de atipias nucleares. Atipias e plurissegmentação nos segmentados; d No setor plaquetogenético aparecem plaquetas grandes e certo grau de perturbação nos megacarióticos, traduzido ás vezes pela presença de núcleos nus.Two hundred fifty bone marrow specimens, including twenty seven from hematologically normal patients, were examined hitologically. The Wright's and Brachet's stains were used. Plasma cells were rarely seen in the peripheral blood and bone marrow of normal individuals, but they were prominent constituents in some pathological states. A number significantly increased of plasma cells or mieloma cells were usually recognized in bone marrow from patients with plasmacytoma. These cells ranged from a very anaplastic immature form to closely resembling plasma cell. Even in the same patient, considerable pleomorphism often occured, and variation in cell size, number of nuclei and degree of nuclear immaturity were common. Although the results report certain observations regarding to the other cell series in patients with plasmacytoma. The most suggestive evidences

  11. Fatores prognósticos no tratamento dos tumores intramedulares

    Directory of Open Access Journals (Sweden)

    Koerbel Andrei

    2002-01-01

    Full Text Available Entre 1993 e 1999, foram analisados 35 pacientes submetidos a microcirurgia para remoção de tumor intramedular nos Serviços de Neurocirurgia do Hospital Nossa Senhora das Graças e do Hospital de Clínicas de Curitiba - PR. A população foi composta por 68,6% de pacientes do sexo masculino; a média de idade era de 32,9 anos. A localização tumoral mais frequente foi torácica em 40% dos casos, seguida pela região cervical e cervicotorácica em 25,7%. Ao exame neurológico realizado entre 6 a 12 meses do pós-operatório, 42,9% dos pacientes demonstraram melhora, 34,3% permaneceram estáveis e 22,9% dos casos apresentaram piora. A ressecção foi total em 57,2% dos casos e subtotal em 37,1%. Em 5,7% dos pacientes, foi realizada apenas biópsia para diagnóstico. O grau de ressecção completa foi maior nos ependimomas (13 de 17 casos e menor nos astrocitomas (5 de 12 casos. Entretanto, o grau de ressecção e o tipo histológico não interferiram na morbidade pós-operatória. Fatores como sexo, idade e tamanho do tumor também não demonstraram importância na evolução após a cirurgia. A localização torácica do tumor foi associada a maior morbidade cirúrgica (p=0,021.

  12. Dinâmica dos micronutrientes em cafeeiros enxertados

    Directory of Open Access Journals (Sweden)

    André Dominghetti Ferreira

    2013-04-01

    Full Text Available As respostas à disponibilidade dos nutrientes variam entre espécies distintas dentro de um mesmo gênero, por causa, principalmente, das exigências nutricionais variáveis, capacidade de absorção, translocação e utilização dos nutrientes. O objetivo deste trabalho foi avaliar a eficiência de absorção, translocação e uso dos micronutrientes por diferentes cultivares de Coffea arabica L., enxertados em Apoatã IAC 2258 (Coffea canephora. O experimento foi instalado em casa de vegetação, utilizando-se o método de cultivo em solução nutritiva. Foi utilizado um fatorial 7 x 3 + 2, sendo sete cultivares de Coffea arabica L. (Palma II, Catucaí 2 SL, Oeiras MG 6851, Obatã IAC 1669-20, Acauã, Topázio MG 1190 e Paraíso MG H 419-1, três tipos de mudas (pé franco, autoenxertada e enxertada sobre o cultivar Apoatã IAC 2258 e duas testemunhas (Apoatã autoenxertado e Apoatã pé franco. O porta-enxerto utilizado influenciou negativamente na absorção de boro, ferro e manganês. A translocação dos micronutrientes boro e cobre obteve maiores índices nas mudas enxertadas. O cultivar Palma II, quando enxertado, apresentou o maior índice de utilização dos nutrientes, mostrando-se passível de ser enxertado. O porta-enxerto utilizado mostrou-se apto para a enxertia, por não sofrer influência negativa, tanto pela enxertia, quanto pelos cultivares utilizados.

  13. Benzene Hydroxylation over FeZSM-5 Catalysts: Which Fe-sites Are Active?

    OpenAIRE

    Yuranov, I.; Bulushev, D. A.; Renken, A.; Kiwi-Minsker, L.

    2004-01-01

    FeZSM-5 with a wide range of Fe content (0.015–2.1 wt%) were studied in the benzene hydroxylation to phenol with nitrous oxide (C6H6:N2O = 1:5) at low temperatures (98%) was obtained within 3 h without any deactivation of the catalyst. Three types of Fe(II) sites were formed in the zeolites extraframework due to activation and are attributed to: (1) Fe(II) sites in mononuclear species, (2) oligonuclear species with at least two oxygen-bridged Fe(II) sites, and (3) Fe(II) sites within Fe2O3 na...

  14. TEORES DE METAIS PESADOS E CARACTERIZAÇÃO MINERALÓGICA DOS SOLOS DO CEMITÉRIO MUNICIPAL DO BOQUEIRÃO, CURITIBA (PR

    Directory of Open Access Journals (Sweden)

    LARISSA KUMMER

    2013-11-01

    Full Text Available As características locais de um cemitério são importantes variáveis que determinam o caminho de contaminantes resultantes do processo de decomposição de cadáveres. Constituem-se também como fontes de contaminantes, o verniz, conservantes da madeira e as partes metálicas dos caixões, que podem liberar metais para o ambiente. O objetivo do trabalho foi estudar a mineralogia da fração argila e os teores de metais pesados dos solos do Cemitério Municipal do Boqueirão, em Curitiba (PR, e avaliar o risco de contaminação ambiental. Foram selecionados seis pontos dentro da área do cemitério, de onde se coletaram amostras em três profundidades (0-20, 20-80 e 80-120 cm. A fração de argila foi estudada por difratometria de raios X e análises térmicas. Os teores totais e trocáveis de Cr, Cu, Pb, Ni e Zn foram determinados. Os teores de Fe2O3 associados com minerais de Fe mais cristalinos foram baixos, o que reflete os baixos teores de Fe dos materiais de origem dos solos e diferentes estágios de desenvolvimentos dos solos. Dentre os metais analisados, os teores de Pb e Zn total foram os que apresentaram os maiores valores em relação a solos de mesmo material de origem, porém tais concentrações não são indicativas de poluição ambiental, e sim de uma branda contaminação. Conclui-se que os solos deste cemitério apresentam-se aptos para esta atividade, visto serem profundos, de textura argilosa e com alto potencial de adsorção de metais.

  15. A study on the magnetic behavior of Nd-Fe-B/α-Fe nanocomposite films

    Science.gov (United States)

    Madeswaran, S.; Tamano, S.; Goto, S.; Tokiwa, K.

    2010-06-01

    Nanocomposite Nd-Fe-B / α-Fe thin films were prepared by sputtering successively a Nd-rich Nd21Fe64B15 and a Fe targets in a multilayer structure using radio frequency (RF) magnetron gun. We have studied the influence of thickness of α-Fe layer on the magnetic properties of Nd-Fe-B / α-Fe thin films. A nanocomposite thin film with 15nm thick α-Fe layer prepared on 550°C heated substrate gives the highest energy product, 190 kJ/m3 along with a coercivity of 950 kA/m. Magnetic hysteresis loop measurement shows that the hard (Nd-Fe-B) and soft (α-Fe) layers are exchange coupled firmly for the films deposited on heated substrate whereas the two layers are decoupled for room temperature deposited and post annealed films.

  16. A study on the magnetic behavior of Nd-Fe-B/α-Fe nanocomposite films

    International Nuclear Information System (INIS)

    Nanocomposite Nd-Fe-B / α-Fe thin films were prepared by sputtering successively a Nd-rich Nd21Fe64B15 and a Fe targets in a multilayer structure using radio frequency (RF) magnetron gun. We have studied the influence of thickness of α-Fe layer on the magnetic properties of Nd-Fe-B / α-Fe thin films. A nanocomposite thin film with 15nm thick α-Fe layer prepared on 5500C heated substrate gives the highest energy product, 190 kJ/m3 along with a coercivity of 950 kA/m. Magnetic hysteresis loop measurement shows that the hard (Nd-Fe-B) and soft (α-Fe) layers are exchange coupled firmly for the films deposited on heated substrate whereas the two layers are decoupled for room temperature deposited and post annealed films.

  17. A study on the magnetic behavior of Nd-Fe-B/{alpha}-Fe nanocomposite films

    Energy Technology Data Exchange (ETDEWEB)

    Madeswaran, S; Tokiwa, K [Polyscale Technology Research Center, Tokyo University of Science 2641 Yamazaki, Noda, Chiba 278-8510 (Japan); Tamano, S; Goto, S, E-mail: smades@rs.noda.tus.ac.j [Department of Applied Electronics, Tokyo University of Science, Japan 2641 Yamazaki, Noda, Chiba, 278-8510 (Japan)

    2010-06-01

    Nanocomposite Nd-Fe-B / {alpha}-Fe thin films were prepared by sputtering successively a Nd-rich Nd{sub 21}Fe{sub 64}B{sub 15} and a Fe targets in a multilayer structure using radio frequency (RF) magnetron gun. We have studied the influence of thickness of {alpha}-Fe layer on the magnetic properties of Nd-Fe-B / {alpha}-Fe thin films. A nanocomposite thin film with 15nm thick {alpha}-Fe layer prepared on 550{sup 0}C heated substrate gives the highest energy product, 190 kJ/m{sup 3} along with a coercivity of 950 kA/m. Magnetic hysteresis loop measurement shows that the hard (Nd-Fe-B) and soft ({alpha}-Fe) layers are exchange coupled firmly for the films deposited on heated substrate whereas the two layers are decoupled for room temperature deposited and post annealed films.

  18. Determination of the sites of Fe atoms in Fe-substituted Mn12

    Institute of Scientific and Technical Information of China (English)

    Cao Hui-Bo; Chen Dong-Liang; He Lun-Hua; Zhang Jun-Rong; Wang Fang-Wei; Wu Zi-Yu; Yan Qi-Wei

    2007-01-01

    In this paper neutron difiraction experiments were performed for Fe-substituted Mn12 in order to determine the sites of Fe atoms.The results of structure refinements for the sample with our accessed highest Fe content showed that all Fe atoms occupied Mn(3) sites in the Mn12 skeleton.The x-ray absorption fine structure experiments as well as multiple scattering simulations gave the same result.Thus we concluded that Fe atoms only occupied Mn(3) sites.This conclusion also means that Fe-substituted Mn12 series only includes the four single-molecule magnets of [Mn12-xFexO12(CH3COO)16(H2O)4]·4H2O(x-1,2,3,and 4), denoted by Mn11Fe1,Mn10Fe2,Mn9Fe3,and Mn8Fe4,respectively.

  19. Process and genes for expression and overexpression of active [FeFe] hydrogenases

    Energy Technology Data Exchange (ETDEWEB)

    Seibert, Michael; King, Paul W; Ghirardi, Maria Lucia; Posewitz, Matthew C; Smolinski, Sharon L

    2014-09-16

    A process for expression of active [FeFe]-hydrogenase in a host organism that does not contain either the structural gene(s) for [FeFe]-hydrogenases and/or homologues for the maturation genes HydE, HydF and HyG, comprising: cloning the structural hydrogenase gene(s) and/or the maturation genes HydE, HydF and HydG from an organisms that contains these genes into expression plasmids; transferring the plasmids into an organism that lacks a native [FeFe]-hydrogenase or that has a disrupted [FeFe]-hydrogenase and culturing it aerobically; and inducing anaerobiosis to provide [FeFe] hydrogenase biosynthesis and H?2#191 production.

  20. Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity

    Energy Technology Data Exchange (ETDEWEB)

    Subedi, Alaska P [ORNL; Zhang, Lijun [ORNL; Singh, David J [ORNL; Du, Mao-Hua [ORNL

    2008-01-01

    We report density functional calculations of the electronic structure, Fermi surface, phonon spectrum, magnetism, and electron-phonon coupling for the superconducting phase FeSe, as well as the related compounds FeS and FeTe. We find that the Fermi-surface structure of these compounds is very similar to that of the Fe-As based superconductors, with cylindrical electron sections at the zone corner, cylindrical hole surface sections, and depending on the compound, other small hole sections at the zone center. As in the Fe-As based materials, these surfaces are separated by a two-dimensional nesting vector at ({pi},{pi}). The density of states, nesting, and Fermi-surface size increase, going from FeSe to FeTe. Both FeSe and FeTe show spin-density wave (SDW) ground states, while FeS is close to instability. In a scenario where superconductivity is mediated by spin fluctuations at the SDW nesting vector, the strongest superconductor in this series would be doped FeTe.

  1. Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity

    International Nuclear Information System (INIS)

    We report density functional calculations of the electronic structure, Fermi surface, phonon spectrum, magnetism, and electron-phonon coupling for the superconducting phase FeSe, as well as the related compounds FeS and FeTe. We find that the Fermi-surface structure of these compounds is very similar to that of the Fe-As based superconductors, with cylindrical electron sections at the zone corner, cylindrical hole surface sections, and depending on the compound, other small hole sections at the zone center. As in the Fe-As based materials, these surfaces are separated by a two-dimensional nesting vector at (π,π). The density of states, nesting, and Fermi-surface size increase, going from FeSe to FeTe. Both FeSe and FeTe show spin-density wave (SDW) ground states, while FeS is close to instability. In a scenario where superconductivity is mediated by spin fluctuations at the SDW nesting vector, the strongest superconductor in this series would be doped FeTe.

  2. Podzolização em solos de áreas de depressão de topo dos tabuleiros costeiros do Nordeste brasileiro Podzolization in soils of depressed summit areas on the coastal plains of the brazilian Northeastern region

    Directory of Open Access Journals (Sweden)

    Elen Alvarenga Silva

    2013-02-01

    Full Text Available Os solos associados às depressões de topo dos Tabuleiros Costeiros são diferenciados sob vários aspectos ainda pouco estudados no Brasil. Geralmente, à medida que se aproxima dessas depressões, nota-se que a textura dos solos é mais arenosa e o hidromorfismo, mais acentuado, sendo comum a ocorrência de Espodossolos. Neste contexto, o objetivo deste trabalho foi realizar diferentes extrações de Fe, Al, Si e C orgânico com o intuito de compreender o processo de podzolização em solos associados às depressões de topo dos Tabuleiros Costeiros do Nordeste brasileiro. Foram descritos perfis e coletadas amostras de solo em quatro áreas: Coruripe, AL; Neópolis, SE; Acajutiba, BA; e Nova Viçosa, BA. Nas amostras, determinou-se o teor de Fe, Al e Si pelos extratores ditionito-citrato-bicarbonato de sódio, oxalato de amônio e pirofosfato de sódio e realizou-se o fracionamento químico da matéria orgânica do solo. Os aumentos nos teores de C orgânico e de Fe e Al pelos diferentes extratores nos horizontes iluviais (de acúmulo de cada solo, relativamente aos horizontes eluviais (de perda, refletiram a morfologia de campo e reforçaram a importância do processo de podzolização nos solos estudados. Complexos Al-húmus dominam inteiramente a matriz dos horizontes iluviais associados ao hidromorfismo, enquanto naqueles sem hidromorfismo a influência das diferentes formas de Fe é variável. O perfil de Espodossolo Ferrihumilúvico é o único, dos quatro estudados, que possui horizontes espódicos com subscrito "s" e, portanto, onde os teores de Fe extraídos refletiram-se diferencialmente na morfologia.The soils associated to depressed summits on the Coastal Plains are still little studied in Brazil and are differentiated in several aspects. Generally, the closer a soil is to these depressions, the sandier is the texture and the more accentuated the hydromorphism, where the occurrence of Spodosols is common. The objective of this

  3. El entorno de la investigación clínica en Colombia: gestión en los centros de investigación a la luz del proceso de certificación en buenas prácticas clínicas

    OpenAIRE

    Roa Álvarez, Diana Paola

    2012-01-01

    La Guía de Buena Práctica Clínica, es un estándar internacional ético y de calidad científica para diseñar, conducir, registrar y reportar estudios clínicos que involucran la participación de seres humanos. En Colombia con la expedición de la Resolución 2378 de 2008, el INVIMA asume la responsabilidad de certificar y ser garante ante la comunidad mundial de que los estudios clínicos que se desarrollan en el país, son conducidos en los centros de investigación de acuerdo con los estándares int...

  4. Effects of changing solution chemistry on Fe 3+/Fe 2+ isotope fractionation in aqueous Fe-Cl solutions

    Science.gov (United States)

    Hill, Pamela S.; Schauble, Edwin A.; Young, Edward D.

    2010-12-01

    The range in 56Fe/ 54Fe isotopic compositions measured in naturally occurring iron-bearing species is greater than 5‰. Both theoretical modeling and experimental studies of equilibrium isotopic fractionation among iron-bearing species have shown that significant fractionations can be caused by differences in oxidation state (i.e., redox effects in the environment) as well as by bond partner and coordination number (i.e., nonredox effects due to speciation). To test the relative effects of redox vs. nonredox attributes on total Fe equilibrium isotopic fractionation, we measured changes, both experimentally and theoretically, in the isotopic composition of an Fe 2+-Fe 3+-Cl-H 2O solution as the chlorinity was varied. We made use of the unique solubility of FeCl 4- in immiscible diethyl ether to create a separate spectator phase against which changes in the aqueous phase could be quantified. Our experiments showed a reduction in the redox isotopic fractionation between Fe 2+- and Fe 3+-bearing species from 3.4‰ at [Cl -] = 1.5 M to 2.4‰ at [Cl -] = 5.0 M, due to changes in speciation in the Fe-Cl solution. This experimental design was also used to demonstrate the attainment of isotopic equilibrium between the two phases, using a 54Fe spike. To better understand speciation effects on redox fractionation, we created four new sets of ab initio models of the ferrous chloride complexes used in the experiments. These were combined with corresponding ab initio models for the ferric chloride complexes from previous work. At 20 °C, 1000 ln β ( β = 56Fe/ 54Fe reduced partition function ratio relative to a dissociated Fe atom) values range from 6.39‰ to 5.42‰ for Fe(H 2O) 62+, 5.98‰ to 5.34‰ for FeCl(H 2O) 5+, and 5.91‰ to 4.86‰ for FeCl 2(H 2O) 4, depending on the model. The theoretical models predict ferric-ferrous fractionation about half as large (depending on model) as the experimental results. Our results show (1) oxidation state is likely to be the

  5. Mechanochemical synthesis of Fe-S materials

    DEFF Research Database (Denmark)

    Jiang, Jianzhong; Larsen, R.K.; Lin, R.;

    1998-01-01

    Powder mixtures of metallic iron and sulfur have been milled in a high-energy planetary ball mill and the formation of iron sulfides has been studied by x-ray diffraction, Mossbauer spectroscopy, and scanning electron microscopy. For Fe:S ratios of 1:1 and 1:2 the final products are FeS with the ......S with the modified NiAs structure and FeS2 (pyrite), respectively. No other iron sulfides were formed for any of the Fe:S ratios studied. The FeS phase has been tested as an electrode material in lithium batteries....

  6. Fe II emission in AGN

    Directory of Open Access Journals (Sweden)

    M. Joly

    2008-01-01

    Full Text Available El espectro óptico de las galaxias Seyfert 1 muestra una gran variedad de líneas de emisión producidas por FeII. Damos tres ejemplos e investigamos la formación de estas líneas con el fin de determinar las condiciones físicas de las regiones en donde se emiten.

  7. Enhancement of microwave absorption of nanocomposite BaFe12O19/α-Fe microfibers

    International Nuclear Information System (INIS)

    Nanocomposite BaFe12O19/α-Fe microfibers with diameters of about 1–5 μm are prepared by the organic gel-thermal selective reduction process. The binary phase of BaFe12O19 and α-Fe is formed after reduction of the precursor BaFe12O19/α-Fe2O3 microfibers at 350 °C for 1 h. These nanocomposite microfibers are fabricated from α-Fe (16–22 nm in diameter) and BaFe12O19 particles (36–42 nm in diameter) and basically exhibit a single-phase-like magnetization behavior, with a high saturation magnetization and coercive force arising from the exchange-coupling interactions of soft α-Fe and hard BaFe12O19. The microwave absorption characteristics in a 2–18 GHz frequency range of the nanocomposite BaFe12O19/α-Fe microfibers are mainly influenced by their mass ratio of α-Fe/BaFe12O19 and specimen thickness. It is found that the nanocomposite BaFe12O19/α-Fe microfibers with a mass ratio of 1:6 and specimen thickness of 2.5 mm show an optimal reflection loss (RL) of −29.7 dB at 13.5 GHz and the bandwidth with RL exceeding −10 dB covers the whole Ku-band (12.4–18.0 GHz). This enhancement of microwave absorption can be attributed to the heterostructure of soft, nano, conducting α-Fe particles embedded in hard, nano, semiconducting barium ferrite, which improves the dipolar polarization, interfacial polarization, exchange-coupling interaction, and anisotropic energy in the nanocomposite BaFe12O19/α-Fe microfibers. (interdisciplinary physics and related areas of science and technology)

  8. Moessbauer-spectroscopic study of structure and magnetism of the exchange-coupled layer systems Fe/FeSn2, and Fe/FeSi/Si and the ion-implanted diluted magnetic semiconductor SiC(Fe)

    International Nuclear Information System (INIS)

    In line with this work the strucural and magnetic properties of the exchange coupled layered systems Fe/FeSn2 and Fe/FeSi/Si and of the Fe ion implanted diluted magnetic semiconductor (DMS) SiC(Fe) were investigated. The main measuring method was the isotope selective 57Fe conversion electron Moessbauer spectroscopy (CEMS), mostly in connection with the 57Fe tracer layer technique, in a temperature range from 4.2 K to 340 K. Further measurement techniques were X-ray diffraction (XRD), electron diffraction (LEED, RHEED), SQUID magnetometry and FMR (Ferromagnetic Resonance). In the first part of this work the properties of thin AF FeSn2(001) films and of the exchange-bias system Fe/FeSn2(001) on InSb(001) were investigated. With the application of 57Fe-tracer layers and CEMS both the Fe-spin structure and the temperature dependence of the magnetic hyperfine field (Bhf) of FeSn2 could be examined. The evaporation of Fe films on the FeSn2 films produced in the latter ones a high perpendicular spin component at the Fe/FeSn2 interface. In some distance from the interface the Fe spins rotate back into the sample plane. Furthermore 57Fe-CEMS provided a correlation between the absolute value of the exchange field vertical stroke He vertical stroke and the amount of magnetic defects within the FeSn2. Temperature dependent CEMS-measurements yielded informations about the spin dynamics within the AF. The transition temperatures TB*, which were interpreted as superparamagnetic blocking temperatures, obtain higher values compared to the temperatures TB of the exchange-bias effect, obtained with magnetometry measurements. The second part of this work deals with the indirect exchange coupling within Fe/FeSi/Si/FeSi/Fe multilayers and FeSi diffusion barriers. The goal was to achieve Fe free Si interlayers. The CEMS results show that starting from a thickness of tFeSi=10-12 A of the ''lower'' FeSi layers the interdiffusion of Fe is inhibited. For thicker FeSi layers (tFeSi ∼ 20 A

  9. Radiation effects on interface reactions of U/Fe, U/(Fe + Cr), and U/(Fe + Cr + Ni)

    Science.gov (United States)

    Shao, Lin; Chen, Di; Wei, Chaochen; Martin, Michael S.; Wang, Xuemei; Park, Youngjoo; Dein, Ed; Coffey, Kevin R.; Sohn, Yongho; Sencer, Bulent H.; Rory Kennedy, J.

    2015-01-01

    We study the effects of radiation damage on interdiffusion and intermetallic phase formation at the interfaces of U/Fe, U/(Fe + Cr), and U/(Fe + Cr + Ni) diffusion couples. Magnetron sputtering is used to deposit thin films of Fe, Fe + Cr, or Fe + Cr + Ni on U substrates to form the diffusion couples. One set of samples are thermally annealed under high vacuum at 450 °C or 550 °C for one hour. A second set of samples are annealed identically but with concurrent 3.5 MeV Fe++ ion irradiation. The Fe++ ion penetration depth is sufficient to reach the original interfaces. Rutherford backscattering spectrometry analysis with high fidelity spectral simulations is used to obtain interdiffusion profiles, which are used to examine differences in U diffusion and intermetallic phase formation at the buried interfaces. For all three diffusion systems, Fe++ ion irradiations enhance U diffusion. Furthermore, the irradiations accelerate the formation of intermetallic phases. In U/Fe couples, for example, the unirradiated samples show typical interdiffusion governed by Fick's laws, while the irradiated ones show step-like profiles influenced by Gibbs phase rules.

  10. Mobile Network DoS Attack and Detection Technology

    Directory of Open Access Journals (Sweden)

    K. Krishnamoorthy

    2013-09-01

    Full Text Available Currently, there has been a 3G mobile networks data traffic explosion due to the large increase in the number of smartphone users. Unlike a traditional wired infrastructure, 3G mobile networks have limited wireless resources and signaling procedures for complex wireless resource management and mobile network security for various abnormal and malicious traffic technologies was not ready. So Malicious or potentially malicious traffic originating from mobile malware infected smart devices can cause serious problems to the 3G mobile networks, such as DoS and scanning attack in wired networks. This paper describes the DoS security threat in the 3G mobile network and proposes a detection technology.

  11. ECONOMIA DOS RECURSOS HUMANOS: TEORIA E EVIDÊNCIAS

    Directory of Open Access Journals (Sweden)

    Andre Carraro

    2014-12-01

    Full Text Available Este trabalho tem como objetivo discutir as diversas contribuições dadas ao longo das últimas décadas à economia dos recursos humanos, uma área de crescente destaque tanto entre a comunidade acadêmica, quanto entre empresários e trabalhadores. Discutem-se os diversos tópicos que compõem as abrangentes relações empresariais, estabelecidos na literatura em quatro tópicos principais: treinamento, incentivos, organização e seleção de pessoas. É feita uma análise dos principais artigos e autores de cada uma dessas subáreas, com o intuito principal de facilitar o acesso à informação, apontar caminhos para novas pesquisas e incentivar potenciais pesquisadores.

  12. Aventuras de diagrama no país dos signos

    Directory of Open Access Journals (Sweden)

    Renira Rampazzo Gambarato

    2014-01-01

    Full Text Available Este artigo aborda as variabilidades do conceito de diagrama pelo viés da Teoria Geral dos Signos ou Semiótica, de Charles Sandres Peirce (1839-1914, e da Teoria Geral dos Sistemas, de Mario Bunge ( 1919 - ... . Etimologicamente, diagrama significa através da linguagem: diágramma, do grego, nasce da junção de dia (através de e gramma (medida de linguagem. No senso comum, seu significado se restringe a um gráfico, o que absolutamente não corresponde à complexidade do termo. Por se tratar de uma representação visual, os diagramas trazem aos nossos olhos a possibilidade de observar as relações neles contidas, relações estas que não necessariamente estavam visíveis antes da construção do diagrama.

  13. Effects of different Fe levels from Fe-nano-chelate and Fe-EDDHA sources on growth and some nutrients concentrations in cowpea in a calcareous soil

    Directory of Open Access Journals (Sweden)

    L. Jokar

    2015-08-01

    Full Text Available To evaluate the effects of different levels of iron (Fe (from Fe-nano-chelate and Fe-EDDHA sources on growth parameters, concentration and absorption of Fe and some nutrients in cowpea (Vigna unguiculata in a calcareous soil, a greenhouse experiment was conducted based on completely randomized design with three replications. Treatments consisted of four levels of Fe (0, 0.135, 0.270 and 0.405 mg Fe per kg soil as Fe-nano-chelate or Fe-EDDHA. The studied soil (Fine-loamy, carbonatic, thermic, Typic Calcixerepts had a loam texture with low available Fe content. Results showed that application of both Fe fertilizers increased shoot dry-matter yield, root dry matter yield, number of pods per plant, weight of pods and seeds per plant, grain weight per pot, shoot Fe concentration and Fe uptake by cowpea as compared to control treatment. Some of the evaluated growth parameters at all levels of Fe from Fe-nano-chelate source were higher than the Fe-EDDHA source and some were the same and had no significant difference. Application of both Fe-nano-chelate and Fe-EDDHA decreased phosphorus and manganese concentrations in shoots as compared to control treatment. Concentration of zinc and cooper in shoots was not significantly affected by the Fe level. In conclusion, lower rates of Fe-nano-chelate were required, as compared to Fe-EDDHA, to alleviate iron deficiency in cowpea grown in calcareous soils.

  14. Magnetic anisotropy studies in Ce/Fe and U/Fe multilayers

    Energy Technology Data Exchange (ETDEWEB)

    Thomas, M.F.; Case, G.S.; Bland, J.; Lucas, C.A.; Herring, A.; Stirling, W.G. [Liverpool Univ. (United Kingdom). Dept. of Physics; Boni, P.; Tixier, S. [Lab. for Neutron Scattering, ETH and PSI, Villigen (Switzerland); Ward, R.C.C.; Wells, M.R. [Oxford Univ. (United Kingdom). Clarendon Lab.; Langridge, S. [ISIS Facility, Rutherford Appleton Lab., Chilton, Didcot (United Kingdom)

    2002-02-16

    Multilayer samples of Ce/Fe, fabricated by sputtering and characterized by X-ray diffraction and reflectivity were studied by polarized neutron reflectivity and Moessbauer spectroscopy. Corresponding studies on sputtered U/Fe multilayers have been initiated. In Fe/Ce a paramagnetic phase, identified as amorphous Fe was observed at Fe thicknesses below 20 A. Perpendicular magnetic anisotropy was observed for Fe thicknesses below 17 A and studies in applied fields enabled magnetic anisotropies to be evaluated for Fe thicknesses up to 40 A. The Ce/Fe interface anisotropy was evaluated as K{sub s}=(0.98{+-}0.15) x 10{sup -3} Jm{sup -2}, among the largest values reported. Neutron reflectivity results did not observe magnetic moments on Ce layers. Preliminary measurements on U/Fe multilayers have not observed induced moments on the U layers. (orig.)

  15. Magnetostrictive GMR spin valves with composite FeGa/FeCo free layers

    Directory of Open Access Journals (Sweden)

    Luping Liu

    2016-03-01

    Full Text Available We have fabricated strain-sensitive spin valves on flexible substrates by utilizing the large magnetostrictive FeGa alloy to promote the strain sensitivity and the composite free layer of FeGa/FeCo to avoid the drastic reduction of giant magnetoresistance (GMR ratio. This kind of spin valve (SV-FeGa/FeCo displays a MR ratio about 5.9%, which is comparable to that of the conventional spin valve (SV-FeCo with a single FeCo free layer. Different from the previously reported works on magnetostrictive spin valves, the SV-FeGa/FeCo displays an asymmetric strain dependent GMR behavior. Upon increasing the lateral strain, the MR ratio for the ascending branch decreases more quickly than that for the descending branch, which is ascribed to the formation of a spiraling spin structure around the FeGa/FeCo interface under the combined influences of both magnetic field and mechanical strain. A strain sensitivity of GF = 7.2 was achieved at a magnetic bias field of -30 Oe in flexible SV-FeGa/FeCo, which is significantly larger than that of SV-FeCo.

  16. Magnetostrictive GMR spin valves with composite FeGa/FeCo free layers

    Science.gov (United States)

    Liu, Luping; Zhan, Qingfeng; Yang, Huali; Li, Huihui; Zhang, Shuanglan; Liu, Yiwei; Wang, Baomin; Tan, Xiaohua; Li, Run-Wei

    2016-03-01

    We have fabricated strain-sensitive spin valves on flexible substrates by utilizing the large magnetostrictive FeGa alloy to promote the strain sensitivity and the composite free layer of FeGa/FeCo to avoid the drastic reduction of giant magnetoresistance (GMR) ratio. This kind of spin valve (SV-FeGa/FeCo) displays a MR ratio about 5.9%, which is comparable to that of the conventional spin valve (SV-FeCo) with a single FeCo free layer. Different from the previously reported works on magnetostrictive spin valves, the SV-FeGa/FeCo displays an asymmetric strain dependent GMR behavior. Upon increasing the lateral strain, the MR ratio for the ascending branch decreases more quickly than that for the descending branch, which is ascribed to the formation of a spiraling spin structure around the FeGa/FeCo interface under the combined influences of both magnetic field and mechanical strain. A strain sensitivity of GF = 7.2 was achieved at a magnetic bias field of -30 Oe in flexible SV-FeGa/FeCo, which is significantly larger than that of SV-FeCo.

  17. Entre combos e enigmas: a complexidade da narrativa dos games

    Directory of Open Access Journals (Sweden)

    Pinheiro, Cristiano Max Pereira

    2005-01-01

    Full Text Available O presente estudo aborda o universo dos games e, como uma forma de realizar uma investigação completa do assunto, invade também questões referentes ao cinema, à televisão, à literatura, aos quadrinhos e à música. Devido à extrema diversidade do formato aqui estudado, optou-se por focalizar a análise em dois conceitos fundamentais: narrativa e interatividade.

  18. Dos nuevas especies de colostethus (amphibia, dendrobatidae) de colombia

    OpenAIRE

    Rivero, Juan A.; Serna, Marco A.

    2012-01-01

    Hasta el momento de escribirse este trabajo se conocían 28 especies deColostethus en Colombia, pero cinco de estas, mencionadas en el trabajo detesis de S. R. EDWARS (1974), todavía no han sido descritas. Las dos especiesque se describen aqui han sido examinadas por W. DUELLMAN, del Museo deHistoria Natural de la Universidad de Kansas (en donde esta depositado elmaterial de EDWARDS), quien ha certificado que no se trata de ninguna desus especies.

  19. Ensino Religioso: espaço dos catecismos

    Directory of Open Access Journals (Sweden)

    Sergio Rogerio Junqueira

    2015-01-01

    Full Text Available Este artigo é resultado da pesquisa qualitativa histórica documental sobre a construção da disciplina do Ensino Religioso a partir dos livros didáticos. Uma das estratégias para compreender a formação dos componentes curriculares no espaço da escola, sendo uma instituição da modernidade que está intimamente relacionada ao projeto da sociedade burguesa urbano-industrial, é refletir como seus caracteres são construídos. A escola vem desempenhando a função de formar e conformar os sujeitos individuais e coletivos aos padrões de racionalização e burocratização dessa sociedade. Embora outras instituições sociais realizem a mesma tarefa, cabe à escola o papel de transmitir os saberes legitimados, fundamental para atender às demandas sociais. Os componentes curriculares colaboram nesta mediação e, dentre outros, é no Ensino Religioso que se percebe concretizado especialmente pelos livros didáticos, que por meio de seus textos e exercícios expressam saberes a serem transmitidos. Compreende-se que por meio dos livros didáticos é possível verificar o desenvolvimento desta disciplina, especialmente em sua origem quando era denominada aula de religião, e que pretendia consolidar o projeto de uma religião hegemônica do país, através de seus catecismos como instrumento de ensino de inúmeras gerações.

  20. Wascyli Simões dos Anjos: metodologias EMUFRN

    OpenAIRE

    Gouveia, Rodrigo Borges Lima

    2014-01-01

    Este estudo está voltado para as metodologias utilizadas no ensino da flauta, desenvolvidas pelo professor Wascyli Simões dos Anjos na EMUFRN. Adotou-se como pressuposto ultrapassar a ideia simplesmente metodológica. Desta forma, a metodologia de ensino da flauta transversal, concretizada pelo professor Wascyli, é tratada como um ensino humanista e humanizado, relacionado a uma racionalidade social onde estão envolvidos comportamentos, valores e saberes. Para tanto, buscou-se investigar os as...

  1. Moessbauer-spectroscopic study of structure and magnetism of the exchange-coupled layer systems Fe/FeSn{sub 2}, and Fe/FeSi/Si and the ion-implanted diluted magnetic semiconductor SiC(Fe); Moessbauerspektroskopische Untersuchung von Struktur und Magnetismus der austauschgekoppelten Schichtsysteme Fe/FeSn{sub 2} und Fe/FeSi/Si und des ionenimplantierten verduennten magnetischen Halbleiters SiC(Fe)

    Energy Technology Data Exchange (ETDEWEB)

    Stromberg, Frank

    2009-07-07

    In line with this work the structural and magnetic properties of the exchange coupled layered systems Fe/FeSn{sub 2} and Fe/FeSi/Si and of the Fe ion implanted diluted magnetic semiconductor (DMS) SiC(Fe) were investigated. The main measuring method was the isotope selective {sup 57}Fe conversion electron Moessbauer spectroscopy (CEMS), mostly in connection with the {sup 57}Fe tracer layer technique, in a temperature range from 4.2 K to 340 K. Further measurement techniques were X-ray diffraction (XRD), electron diffraction (LEED, RHEED), SQUID magnetometry and FMR (Ferromagnetic Resonance). In the first part of this work the properties of thin AF FeSn{sub 2}(001) films and of the exchange-bias system Fe/FeSn{sub 2}(001) on InSb(001) were investigated. With the application of {sup 57}Fe-tracer layers and CEMS both the Fe-spin structure and the temperature dependence of the magnetic hyperfine field (B{sub hf}) of FeSn{sub 2} could be examined. The evaporation of Fe films on the FeSn{sub 2} films produced in the latter ones a high perpendicular spin component at the Fe/FeSn{sub 2} interface. In some distance from the interface the Fe spins rotate back into the sample plane. Furthermore {sup 57}Fe-CEMS provided a correlation between the absolute value of the exchange field vertical stroke He vertical stroke and the amount of magnetic defects within the FeSn{sub 2}. Temperature dependent CEMS-measurements yielded informations about the spin dynamics within the AF. The transition temperatures T{sub B}{sup *}, which were interpreted as superparamagnetic blocking temperatures, obtain higher values compared to the temperatures T{sub B} of the exchange-bias effect, obtained with magnetometry measurements. The second part of this work deals with the indirect exchange coupling within Fe/FeSi/Si/FeSi/Fe multilayers and FeSi diffusion barriers. The goal was to achieve Fe free Si interlayers. The CEMS results show that starting from a thickness of t{sub FeSi}=10-12 A of the

  2. Interstitial Fe in MgO

    CERN Document Server

    Mølholt, T E; Gunnlaugsson, H P; Svane, A; Masenda, H; Naidoo, D; Bharuth-Ram, K; Fanciulli, M; Gislason, H P; Johnston, K; Langouche, G; Ólafsson, S; Sielemann, R; Weyer, G

    2014-01-01

    Isolated Fe-57 atoms were studied in MgO single-crystals by emission Mossbauer spectroscopy following implantation of Mn-57 decaying to Fe-57. Four Mossbauer spectral components were found corresponding to different Fe lattice positions and/or charge states. Two components represent Fe atoms substituting Mg as Fe2+ and Fe3+, respectively; a third component is due to Fe in a strongly implantation-induced disturbed region. The fourth component, which is the focus of this paper, can be assigned to Fe at an interstitial site. Comparison of its measured isomer shift with ab initio calculations suggests that the interstitial Fe is located on, or close to, the face of the rock-salt MgO structure. To harmonize such an assignment with the measured near-zero quadrupole interaction a local motion process (cage motion) of the Fe has to be stipulated. The relation of such a local motion as a starting point for long range diffusion is discussed.

  3. Synthesis of high magnetization Fe and FeCo nanoparticles by high temperature chemical reduction

    Energy Technology Data Exchange (ETDEWEB)

    Kandapallil, B; Colborn, RE; Bonitatibus, PJ; Johnson, F

    2015-03-15

    Fe and FeCo ferromagnetic nanoparticles in the 5-10 nm size regimes featuring high magnetization were synthesized using a modified chemical reduction method. The structure and morphology of these nanoparticles were confirmed by XRD and TOM analysis. These small, monodisperse and phase pure nanoparticles exhibited magnetic saturation of 210 emu/g (Fe) and 220 emu/g (Fe+Co) for Fe and FeCo nanoparticles respectively. The magnetization was found to be dependent on the temperature at which the reducing agent was introduced. (C) 2014 Elsevier B.V. All rights reserved,

  4. Magnetic studies of fine Fe and Co species formed in Fe/Zeolite catalysts

    International Nuclear Information System (INIS)

    Magnetic, Moessbauer, and I.R. studies of nano size particles of Fe and Co species dispersed in a cage of aluminosilicates structure, in relation to syngas (CO+H2) Fischer Tropsch conversion. The difference in the catalytic activity of such species have shown dependency on their degree of dispersion. The carbonyl impregnation gave ultra-fine Super Paramagnetic Fe3O4, whereas the nitrate impregnation gave larger size particles of Fe3O4 or α-Fe2O3. The active Fe5C2 component was converted to Fe3C during the above reaction

  5. Effect of Iron Fe (II and Fe (III in a Binary System Evaluated Bioluminescent Method

    Directory of Open Access Journals (Sweden)

    Elena Sorokina

    2013-01-01

    Full Text Available The effect of iron ions Fe2+ and Fe3+ on the bioluminescent recombinant strain of Escherichia coli in a single-component and binary system. Found that for the bacteria E. coli Fe3+ ions are more toxic than Fe2+. Under the combined effect of iron toxicity increases, the percentage of luminescence quenching increases, but the value is much less than the sum of the indicator for the Fe2+ and Fe3+. The biological effect of insertion of iron is not proportional to their content in the mixture.

  6. Possible Superconductivity in Fe-Sb Based Materials: Density Functional Study of LiFeSb

    OpenAIRE

    Zhang, Lijun; Subedi, Alaska; Singh, D. J.; Du, Mao-Hua

    2008-01-01

    We investigate the electronic and other properties of the hypothetical compound LiFeSb in relation to superconducting LiFeAs and FeSe using density functional calculations. The results show that LiFeSb in the LiFeAs structure would be dynamically stable in the sense of having no unstable phonon modes, and would have very similar electronic and magnetic properties to the layered Fe based superconductors. Importantly, a very similar structure for the Fermi surface and a spin density wave relate...

  7. Fe3O4/MgO/Fe Heteroepitaxial Structures for Magnetic Tunnel Junctions

    Energy Technology Data Exchange (ETDEWEB)

    Orna, J. [University of Zaragoza, Spain; Morellon, Luis [University of Zaragoza, Spain; Algarabel, Pedro A. [University of Zaragoza, Spain; Pardo, J. A. [University of Zaragoza, Spain; Sangiao, S [Instituto de Nanociencia de Aragón, Universidad de Zaragoza, Zaragoza, 50009 Spain; Magen, C [Oak Ridge National Laboratory (ORNL); Snoeck, E. [CEMES-CNRS, Toulouse, France; De Teresa, J M [Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, Zaragoza, 50009 Spain; Ibarra, M. Ricardo [University of Zaragoza, Spain

    2008-01-01

    In this work we report the growth and structural and magnetic characterization of heteroepitaxial Fe O/MgO/Fe junctions. All three layers have been deposited by pulsed laser deposition. Combining High Resolution Transmission Electron Microscopy and X-ray results, we have obtained for the heterostructure the epitaxy relation MgO(001) [100]//Fe O(001)[100]/MgO(001) [100]/Fe(001)[110]. All interfaces appear very sharp with relatively small root-mean square (rms) roughness, 0.2 nm. The magnetic coupling between Fe O and Fe electrodes is also very small, 0.03 mJ/

  8. A Importância dos Carboidratos na Alimentação dos Eqüinos

    OpenAIRE

    Eliane Morgado:; Leandro Galzerano

    2008-01-01

    Os carboidratos são extremamente importantes na dieta dos eqüinos,sendo os carboidratos não estruturais as fontes primárias de energia. Os monossacarídeos são as únicas formas de carboidratos que podem ser absorvidos pelo intestino delgado e os carboidratos mais complexos são fermentados no intestino grosso, onde ocorre a fermentação microbiana. As frações dos carboidratos são definidas pelos métodos químicos ou enzimáticos utilizados nas análises, e vários são os métodos de avaliação da qual...

  9. Dos crisis, dos desenlaces: Retos realidades del empresario organizado colombiano en los años cincuenta y noventa

    Directory of Open Access Journals (Sweden)

    Angelika Rettberg

    2001-01-01

    Full Text Available El empresariado organizado nacional enfrenta principalmente dos tensiones: por un lado, la contradicción entre una estructura gremial formada por el régimen proteccionista de la política industrial de mitad de siglo pasado y las exigencias, retos y oportunidades para el empresariado organizado que ofrece una economía que se adentra en un mundo globalizado.

  10. Reforma na atencao primaria a saude e implicacoes na cultura organizacional dos Agrupamentos dos Centros de Saude em Portugal

    Directory of Open Access Journals (Sweden)

    Claudia Leone

    2014-01-01

    Full Text Available A crescente complexidade dos desafios do setor da saúde implica um aumento das responsabilidades para aqueles que nela assumem funções de gestão. Há consenso que a qualidade da força de trabalho em saúde é um fator crítico para o sucesso de qualquer reforma no setor. O objetivo desta investigação é estudar e analisar a alteração induzida por uma intervenção de formação-ação intensiva na cultura organizacional de 73 diretores executivos dos Agrupamentos dos Centros de Saúde (ACES em Portugal durante a reforma na atenção primária à saúde. Os dados foram coletados e analisados em dois períodos temporais, antes e depois da intervenção do Programa Avançado em Gestão, Governação Clínica e Liderança para os ACES, o qual teve um ano de duração. O modelo Competing Values Framework permitiu observar que, depois da intervenção de formação-ação, as percepções dos diretores executivos sobre a sua cultura organizacional se encontram mais alinhadas com a reforma da atenção primária à saúde, valorizando o tipo de práticas e valores que esta defende. É necessário continuar a monitorizar os resultados em vários períodos temporais para elaborar conclusões a esse respeito.

  11. Storage Ring Cross Section Measurements for Electron Impact Ionization of Fe^11+ Forming Fe^12+ and Fe^13+

    OpenAIRE

    Hahn, M.; Bernhardt, D.; Grieser, M.; Krantz, C.; Lestinsky, M.; Mueller, A.; Novotny, O.; Repnow, R.; Schippers, S.; Wolf, A.; Savin, D. W.

    2011-01-01

    We report ionization cross section measurements for electron impact single ionization (EISI) of Fe^11+$ forming Fe^12+ and electron impact double ionization (EIDI) of Fe^11+ forming Fe^13+. The measurements cover the center-of-mass energy range from approximately 230 eV to 2300 eV. The experiment was performed using the heavy ion storage ring TSR located at the Max-Planck-Institut fur Kernphysik in Heidelberg, Germany. The storage ring approach allows nearly all metastable levels to relax to ...

  12. Nature of impurities in fertilizers containing EDDHMA/Fe(3+), EDDHSA/Fe(3+), and EDDCHA/Fe(3+) chelates.

    Science.gov (United States)

    Alvarez-Fernández, Ana; Cremonini, Mauro A; Sierra, Miguel A; Placucci, Giuseppe; Lucena, Juan J

    2002-01-16

    Iron chelates derived from ethylenediaminedi(o-hydroxyphenylacetic) acid (EDDHA), ethylenediaminedi(o-hydroxy-p-methylphenylacetic) acid (EDDHMA), ethylenediaminedi(2-hydroxy-5-sulfophenylacetic) acid (EDDHSA), and ethylenediaminedi(5-carboxy-2-hydroxyphenylacetic) acid (EDDCHA) are remarkably efficient in correcting iron chlorosis in plants growing in alkaline soils. This work reports the determination of impurities in commercial samples of fertilizers containing EDDHMA/Fe(3+), EDDHSA/Fe(3+), and EDDCHA/Fe(3+). The active components (EDDHMA/Fe(3+), EDDHSA/Fe(3+), and EDDCHA/Fe(3+)) were separated easily from other compounds present in the fertilizers by HPLC. Comparison of the retention times and the UV-visible spectra of the peaks obtained from commercial EDDHSA/Fe(3+) and EDDCHA/Fe(3+) samples with those of standard solutions showed that unreacted starting materials (p-hydroxybenzenesulfonic acid and p-hydroxybenzoic acid, respectively) were always present in the commercial products. 1D and 2D NMR experiments showed that commercial fertilizers based on EDDHMA/Fe(3+) contained impurities having structures tentatively assigned to iron chelates of two isomers of EDDHMA. These findings suggest that current production processes of iron chelates used in agriculture need to be improved. PMID:11782196

  13. Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity

    OpenAIRE

    Subedi, Alaska; Zhang, Lijun; Singh, David J.; Du, Mao-Hua

    2008-01-01

    We report density functional calculations of the electronic structure, Fermi surface, phonon spectrum, magnetism and electron-phonon coupling for the superconducting phase FeSe, as well as the related compounds FeS and FeTe. We find that the Fermi surface structure of these compounds is very similar to that of the Fe-As based superconductors, with cylindrical electron sections at the zone corner, cylindrical hole surface sections, and depending on the compound, other small hole sections at th...

  14. O valor dos valores: avaliação de uma marca global por meio dos diversos brasis culturais

    Directory of Open Access Journals (Sweden)

    Edar da Silva Añaña

    2009-06-01

    Full Text Available Este trabalho explora as influências dos valores pessoais e de outros elementos da cultura brasileira, na avaliação de uma marca de alcance mundial, por meio de quatro subculturas regionais que são utilizadas como unidades de análise. Utiliza as escalas de Rokeach (1968, 1973 para medir os valores humanos e a de Aaker (1997 para avaliar os atributos da marca, numa amostra de 308 pessoas, entre estudantes e profissionais de nível superior. O resultado confirma a existência de relações significativas entre os valores pessoais e a percepção da marca Nike, bem como a influência dos rituais, dos símbolos e de algumas variáveis demográficas, na forma como aquela marca é percebida e avaliada pelos consumidores. Confirma também a existência de diferenças significativas entre os elementos culturais das diversas subculturas, que podem ser bastante úteis na formulação de estratégias de marketing voltadas às diversas regiões do país.

  15. Effects of Fe fine powders doping on hot deformed NdFeB magnets

    Energy Technology Data Exchange (ETDEWEB)

    Lin, Min, E-mail: linm@nimte.ac.cn [Ningbo Institute of Material Technology & Engineering Chinese Academy of Science, Ningbo 315201 (China); Wang, Huijie [Ningbo Jinji Strong Magnetic Material Company, Ningbo 315041 (China); Zheng, Jingwu [Zhejiang University of Technology, Hangzhou 310014 (China); Yan, Aru [Ningbo Institute of Material Technology & Engineering Chinese Academy of Science, Ningbo 315201 (China)

    2015-04-01

    The composite NdFeB magnets with blending melt-spun flakes and Fe fine powders were prepared by the hot-pressed and hot-deformed route. Characterizations of the hot-deformed NdFeB magnets affected by the doped Fe powders were tested. The doped Fe powders decrease the hot-deformed pressure when the strain is between 15 and 50%. XRD patterns show that the doped Fe powders have little influence on the c-axis alignment of hot-deformed NdFeB magnets in the press direction. The B{sub r} and the (BH){sub max} get improved when the doped Fe powders are less than 3 wt%. The doped Fe of hot-deformed NdFeB magnets exists in the elongated state and the spherical state surrounded by the Nd-rich phase. With the Fe fraction increasing, the potential of magnet moves to the positive direction and the diameter of the Nyquist arc becomes larger, which indicate that the corrosion resistance improved effectively. The bending strength was enhanced by the elongated α-Fe phase embedded in the matrix 2:14:1 phase. - Highlights: • The doped Fe powders have little influence on the c-axis alignment of magnets. • The elongated Fe powders are more than the spherical Fe powders in the magnets. • The corrosion resistance is improved effectively with the increasing Fe fraction. • The bending strength is enhanced by the elongated α-Fe phase embedded in the matrix.

  16. Recombinant antibodies for specific detection of clostridial [Fe-Fe] hydrogenases

    Science.gov (United States)

    Mangayil, Rahul; Karp, Matti; Lamminmäki, Urpo; Santala, Ville

    2016-01-01

    Biological hydrogen production is based on activity of specific enzymes called hydrogenases. Hydrogenases are oxygen sensitive metalloenzymes containing Ni and/or Fe atoms at the active site, catalyzing reversible reduction of protons. Generally, [Fe-Fe] hydrogenases prefer proton reduction to molecular hydrogen, a potential energy carrier molecule that can be produced by bioprocesses in sustainable manner. Thus, monitoring tools have been developed to study the relationship between [Fe-Fe] hydrogenases and biohydrogen production in bioreactors at DNA and RNA levels. In the present study, novel molecular tools are introduced for quantitative monitoring of clostridial [Fe-Fe] hydrogenases at the protein level. Aerobic and anaerobic biopanning (for inactive and active [Fe-Fe] hydrogenase, respectively) of phage displayed single-chain variable fragment (scFv) antibody libraries aided in isolating nine potential scFvs. The enriched antibodies demonstrated high specificity towards Clostridium spp. [Fe-Fe] hydrogenases allowing detection from pure and mixed cultures. Additionally, the antibodies showed different binding characteristics towards hydrogenase catalytic states, providing a possible means for functional detection of clostridial [Fe-Fe] hydrogenases. From hydrogenase-antibody interaction studies we observed that though antibody binding reduced the enzyme catalytic activity, it facilitated to retain hydrogen evolution from oxygen exposed hydrogenases. PMID:27786270

  17. Effect of Fe state on electrocatalytic activity of Pd-Fe/C catalyst for oxygen reduction

    International Nuclear Information System (INIS)

    The carbon-supported Pd-Fe catalyst (Pd-Fe/C) is prepared in the H2O/tetrahydrofuran (THF) mixture solvent under the low temperature. The homemade Pd-Fe/C catalyst contains two forms of iron species, alloying and non-alloying Fe. The alloying Fe species is hardly dissolved in 0.5 M H2SO4 solution, while the non-alloying Fe species is easily dissolved in 0.5 M H2SO4 solution. The electrochemical measurements show the electrocatalytic activity of the Pd-Fe/C catalyst with the acid treatment for the oxygen reduction is higher than that of the Pd-Fe/C catalyst without the acid treatment, illustrating that the non-alloying Fe species suppresses the electrocatalytic activity of the Pd-Fe/C catalyst. In contrast, the alloying Fe species promotes the electrocatalytic activity of the Pd-Fe/C catalyst for the oxygen reduction, which is likely attributed to the change of the electron structure of Pd atom and/or bond length of Pd-Pd in the Pd-Fe/C catalyst.

  18. Lattice locations and properties of Fe in Co/Fe co-implanted ZnO

    DEFF Research Database (Denmark)

    Gunnlaugsson, H.P.; Johnston, K.; Mølholt, T.E.;

    2012-01-01

    The lattice locations and electronic configurations of Fe in 57Co/57Fe implanted ZnO (to (5‐6) × 1014 Fe/cm−2) have been studied by 57Fe Mössbauer emission spectroscopy. The spectra acquired upon room temperature implantation show ∼20% of the probe atoms as Fe2+ on perturbed Zn sites and the rema......The lattice locations and electronic configurations of Fe in 57Co/57Fe implanted ZnO (to (5‐6) × 1014 Fe/cm−2) have been studied by 57Fe Mössbauer emission spectroscopy. The spectra acquired upon room temperature implantation show ∼20% of the probe atoms as Fe2+ on perturbed Zn sites...... and the remaining fraction as Fe2+ in damage sites of interstitial character. After annealing at 773 K, ∼20% remain on crystalline sites, while the damage fraction has partly disappeared and instead a ∼30% fraction occurs as high‐spin Fe3+, presumably in precipitates. This suggests that precipitation of Co/Fe in ZnO...... likely takes place at relatively low temperatures, thus explaining some of the discrepancies in the literature regarding magnetic properties of 3d metal‐doped ZnO....

  19. Controllable exchange bias in Fe/metamagnetic FeRh bilayers

    Science.gov (United States)

    Suzuki, Ippei; Hamasaki, Yosuke; Itoh, Mitsuru; Taniyama, Tomoyasu

    2014-10-01

    We report the studies of tuning the exchange bias at ferromagnetic Fe/metamagnetic FeRh bilayer interfaces. Fe/FeRh(111) bilayers show exchange bias in the antiferromagnetic state of FeRh while no exchange bias occurs at Fe/FeRh(001) interface. The contrasting results are attributed to the spin configurations of FeRh at the interface, i.e., the uncompensated ferromagnetic spin configuration of FeRh appears exclusively for (111) orientation. The exchange bias disappears as the bilayers are warmed above the antiferromagnetic-ferromagnetic transition temperature. The direction of the exchange bias for Fe/FeRh(111) is also found to be perpendicular to the cooling-field direction, in contrast to the commonly observed direction of exchange bias for ferromagnetic/antiferromagnetic interfaces. In view of these results, the exchange bias in Fe/FeRh bilayers with the (111) crystallographic orientation should be useful for the design of rapid writing technology for magnetic information devices.

  20. Controllable exchange bias in Fe/metamagnetic FeRh bilayers

    Energy Technology Data Exchange (ETDEWEB)

    Suzuki, Ippei; Hamasaki, Yosuke; Itoh, Mitsuru; Taniyama, Tomoyasu, E-mail: taniyama.t.aa@m.titech.ac.jp [Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503 (Japan)

    2014-10-27

    We report the studies of tuning the exchange bias at ferromagnetic Fe/metamagnetic FeRh bilayer interfaces. Fe/FeRh(111) bilayers show exchange bias in the antiferromagnetic state of FeRh while no exchange bias occurs at Fe/FeRh(001) interface. The contrasting results are attributed to the spin configurations of FeRh at the interface, i.e., the uncompensated ferromagnetic spin configuration of FeRh appears exclusively for (111) orientation. The exchange bias disappears as the bilayers are warmed above the antiferromagnetic-ferromagnetic transition temperature. The direction of the exchange bias for Fe/FeRh(111) is also found to be perpendicular to the cooling-field direction, in contrast to the commonly observed direction of exchange bias for ferromagnetic/antiferromagnetic interfaces. In view of these results, the exchange bias in Fe/FeRh bilayers with the (111) crystallographic orientation should be useful for the design of rapid writing technology for magnetic information devices.

  1. Magnetic properties of ball-milled TbFe2 and TbFe2B

    Indian Academy of Sciences (India)

    J Arout Chelvane; S Kasiviswanathan; M V Rao; G Markandeyulu

    2004-04-01

    The magnetic properties of ball-milled TbFe2 and TbFe2B were studied by magnetization measurements. X-ray diffraction studies on TbFe2B showed that boron occupied interstitial position in the crystal structure, just as hydrogen did. The value of the saturation magnetization of TbFe2B was found to be smaller than that of TbFe2. This is explained on the basis of a charge transfer between the boron atoms and the 3d band of Fe. The anisotropy of TbFe2B was found to be large compared to that of TbFe2. X-ray diffractograms for the ball milled samples showed that after 80 h of milling, a predominantly amorphous phase was obtained. TbFe2B was found to undergo easy amorphization compared to TbFe2. Magnetization of TbFe2 was found to decrease rapidly with initial milling hours and was found to be constant with further hours of milling. TbFe2B exhibited an anomalous behaviour with an increase in moment with milling hours and this may be due to the segregation of -Fe.

  2. [Fe IV] Emission in Ionized Nebulae

    Directory of Open Access Journals (Sweden)

    M. Rodríguez

    2003-01-01

    Full Text Available Se presentan los resultados de un análisis de la emisión en [Fe IV] en varias nebulosas ionizadas, basado en nuevas identificaciones y medidas anteriores de líneas de [Fe IV]. Las abundancias de Fe obtenidas al sumar las abundancias de los iones relevantes (principalmente Fe++ y Fe3+ resultan ser menores, por factores en el rango 2.6-5.9, que las abundancias implicadas por las líneas de [Fe III] y un factor de corrección por la ionizacion obtenido con modelos de ionizacion. Se discuten las posibles razones de esta discrepancia así como las implicaciones que tiene para nuestro entendimiento tanto de la evolución del polvo en nebulosas ionizadas como de la historia química de galaxias de baja metalicidad.

  3. Research on the Strategy on Defense DOS/DDOS Attack on Internet%互联网防御DOS/DDOS攻击策略研究

    Institute of Scientific and Technical Information of China (English)

    王鹏

    2012-01-01

      It mainly presents the principle of DOS/DDOS attack and the variety, focuses on the strategies on defense DOS/DDOS attack. Combined with professional defense system, it discusses the construction of the defense architecture.%  主要介绍DOS/DDOS攻击的原理与种类,并着重介绍防御DOS/DDOS攻击的应对策略,并结合专业防御系统对构建专业防御体系进行了探讨。

  4. Os partidos políticos brasileiros e a internet: uma avaliação dos websites dos partidos políticos do Brasil

    OpenAIRE

    Sérgio Soares Braga; Andressa Silvério Terra França; María Alejandra Nicolás

    2009-01-01

    O objetivo do artigo é apresentar os resultados de nossa pesquisa sobre os websites dos partidos políticos brasileiros na internet. A partir do mapeamento da literatura internacional sobre o assunto, apresentamos uma proposta de avaliação dos websites dos principais partidos políticos brasileiros e apresentamos uma classificação do grau de uso da internet de todos os partidos nacionais. Aplicando uma planilha de análise de conteúdo aos websites dos 27 partidos políticos brasileiros com regist...

  5. Preparation of γ-Fe2O3/Ni2O3/FeCl3(FeCl2 Composite Nanoparticles by Hydrothermal Process Useful for Ferrofluids

    Directory of Open Access Journals (Sweden)

    Qingmei Zhang

    2011-01-01

    Full Text Available Using a hydrothermal process in FeCl2 solution, γ-Fe2O3/Ni2O3/FeCl3(FeCl2 composite nanoparticles were obtained from the FeOOH/Ni(OH2 precursor prepared by coprecipitation. The precursor and the as-prepared nanoparticles were investigated by vibrating sample magnetometer (VSM, X-ray diffraction (XRD, energy disperse X-ray spectroscopy (EDX, X-ray photoelectron spectroscopy (XPS, and transmission electron microscopy (TEM. The experimental results showed that the paramagnetic amorphous precursor, in which Ni(OH2 is formed outside FeOOH, is transformed to ferrimagnetic γ-Fe2O3/Ni2O3 composite when it is processed in FeCl2 solution (0.25, 0.50, 1.00 M in an autoclave at 100°C for 1 hr. In addition, the dismutation reaction of FeCl2 produces FeCl3 and Fe. Some FeCl3 and little FeCl2 can be absorbed to form γ-Fe2O3/Ni2O3/FeCl3(FeCl2 composite nanoparticles in which Ni2O3 forms outside the γ-Fe2O3 core and the outermost layer is FeCl3 (FeCl2. The content of FeCl3 (FeCl2 in the particles increased, and the magnetization of the particles decreased with the concentration of FeCl2 solution increasing in the hydrothermal process. The FeCl3 (FeCl2 surface is chemically passive and nonmagnetic (paramagnetic. Accordingly, the composite nanoparticles are chemically stable, and their aggregation is prevented. The specific saturation magnetization of such composite nanoparticles can get to 57.4–62.2 emu/g and could be very suitable for synthesizing ferrofluids.

  6. Magnetization Reversal in Elongated Fe Nanoparticles

    OpenAIRE

    Li, Yongqing; Xiong, Peng; von Molnar, Stephan; Ohno, Yuzo; Ohno, Hideo

    2005-01-01

    Magnetization reversal of individual, isolated high-aspect-ratio Fe nanoparticles with diameters comparable to the magnetic exchange length is studied by high-sensitivity submicron Hall magnetometry. For a Fe nanoparticle with diameter of 5 nm, the magnetization reversal is found to be an incoherent process with localized nucleation assisted by thermal activation, even though the particle has a single-domain static state. For a larger elongated Fe nanoparticle with a diameter greater than 10 ...

  7. "En este libro no hallo cosa que se oponga a los dogmas de nuestra Santa Fe ni a las buenas costumbres": um estudo sobre dedicatórias, prólogos e censuras em tratados de cirurgia e de medicina do Setecentos

    Directory of Open Access Journals (Sweden)

    Eliane Cristina Deckmann Fleck

    2013-04-01

    Full Text Available Neste artigo, analisamos os textos das dedicatórias, censuras, aprovações e prólogos publicados em tratados de cirurgia e de medicina, escritos ou editados na Espanha durante a primeira metade do século XVIII, e que tiveram comprovada circulação, constituindo-se em obras de referência para jesuítas que atuaram como boticários e médicos na América. Para além da identificação das estratégias de escrita evidenciadas nestes textos, que precedem o conteúdo propriamente dito desses tratados impressos, avaliamos como, através deles, seus autores e editores procuraram apontar caminhos adequados de leitura e, assim, difundir determinados conhecimentos científicos na Espanha e nas áreas de seu vasto império colonial no século XVIII.

  8. Possible Superconductivity in Fe-Sb Based Materials: Density Functional Study of LiFeSb

    International Nuclear Information System (INIS)

    We investigate the electronic and other properties of the hypothetical compound LiFeSb in relation to superconducting LiFeAs and FeSe using density-functional calculations. The results show that LiFeSb in the LiFeAs structure would be dynamically stable in the sense of having no unstable phonon modes and would have very similar electronic and magnetic properties to the layered Fe-based superconductors. Importantly, a very similar structure for the Fermi surface and a spin-density wave related to but stronger than that in the corresponding As compound is found. These results are indicative of possible superconductivity analogous to the Fe-As based compounds if the spin-density wave can be suppressed by doping or other means. Prospects for synthesizing this material in pure form or in solid solution with FeTe are discussed.

  9. Possible Superconductivity in Fe-Sb Based Materials: Density Functional Study of LiFeSb

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Lijun [ORNL; Subedi, Alaska P [ORNL; Singh, David J [ORNL; Du, Mao-Hua [ORNL

    2008-01-01

    We investigate the electronic and other properties of the hypothetical compound LiFeSb in relation to superconducting LiFeAs and FeSe using density-functional calculations. The results show that LiFeSb in the LiFeAs structure would be dynamically stable in the sense of having no unstable phonon modes and would have very similar electronic and magnetic properties to the layered Fe-based superconductors. Importantly, a very similar structure for the Fermi surface and a spin-density wave related to but stronger than that in the corresponding As compound is found. These results are indicative of possible superconductivity analogous to the Fe-As based compounds if the spin-density wave can be suppressed by doping or other means. Prospects for synthesizing this material in pure form or in solid solution with FeTe are discussed.

  10. Natural and Treated FeS2 in Li/FeS2 Coin Cell

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Treated FeS2 samples were prepared by natural FeS2 samples which were ground first,heated in nitrogen and then washed in acid. The levels of impurity elements, primarily present as metallic oxides and sulfides, are higher in the natural FeS2 than those in the treated sample. Scanning electron microscopy shows that the grain sizes of treated FeS2 particles are smaller than those of natural FeS2 particles. The electrochemical performance of Li/treated FeS2 cells is attributed to the smaller grain sizes and higher purity of treated FeS2 particles in comparison to the natural FeS2sample.

  11. Fe-V redox flow batteries

    Science.gov (United States)

    Li, Liyu; Kim, Soowhan; Yang, Zhenguo; Wang, Wei; Zhang, Jianlu; Chen, Baowei; Nie, Zimin; Xia, Guanguang

    2014-07-08

    A redox flow battery having a supporting solution that includes Cl.sup.- anions is characterized by an anolyte having V.sup.2+ and V.sup.3+ in the supporting solution, a catholyte having Fe.sup.2+ and Fe.sup.3+ in the supporting solution, and a membrane separating the anolyte and the catholyte. The anolyte and catholyte can have V cations and Fe cations, respectively, or the anolyte and catholyte can each contain both V and Fe cations in a mixture. Furthermore, the supporting solution can contain a mixture of SO.sub.4.sup.2- and Cl.sup.- anions.

  12. Gd13Fe10C13: Indications of Fe-Fe Multiple Bonding Emerging from Chemical Frustration

    Energy Technology Data Exchange (ETDEWEB)

    Hadler, Amelia B; Fredrickson, Daniel C [UW

    2012-10-25

    We report the synthesis and crystal structure of the carbide Gd13Fe10C13. This compound adopts a new structure type that is remarkable for its 'H'-shaped C2FeFeC2 units, which have some of the shortest Fe-Fe contacts known. A bonding analysis using DFT-calibrated Hueckel calculations hints that Fe-Fe multiple bonding underlies these short distances. Gd13Fe10C13 undergoes ferromagnetic ordering at ~55 K.

  13. Fe photoionization transitions in ZnSSe:Fe crystals - photo-ESR studies

    Science.gov (United States)

    Swiatek, K.; Godlewski, M.; Surkova, T. P.

    2005-02-01

    Photoionization transitions of iron ions in ZnSxSe1-x:Fe bulk crystals (0 x 1.0) were studied at temperature of 100 K. By monitoring changes of the Fe3+ electron spin resonance signal under external illumination, we are able to determine energies of Fe3+ Fe2+ + hVB transition in different ZnSxSe1-x host crystals. At low temperature (T 3+ centres.

  14. Sound Velocities of Fe-C and Fe-Si alloying liquids at high pressures

    Science.gov (United States)

    Jing, Z.; Han, J.; Yu, T.; Wang, Y.

    2014-12-01

    Geophysical and geochemical observations suggest light elements such as S, Si, C, O, H, etc., are likely present in the Earth's outer core and the molten cores of other terrestrial planets and moons including Mercury, Mars, Earth's Moon, and Ganymede. In order to constrain the abundances of light elements in planetary cores, it is crucial to determine the density and sound velocity of Fe-light element alloying liquids under core conditions. In this study, sound velocities of Fe-rich liquids were determined by combining the ultrasonic measurements with synchrotron X-ray radiography and diffraction techniques under high-pressure and temperature conditions from 1 to 6 GPa and 1573 to 1973 K. An Fe-C composition (Fe-5wt%C) and four Fe-Si compositions (Fe-10wt%Si, Fe-17wt%Si, Fe-25wt%Si, and FeSi) were studied. Compared to our previous results on the velocity of Fe and Fe-S liquids at high pressures (Jing et al., 2014, Earth Planet. Sci. Lett. 396, 78-87), the presence of both C and Si increases the velocity of liquid Fe, in contrast to the effect of S. The measured velocities of Fe-C and Fe-Si liquids increase with compression and decrease slightly with increasing temperature. Combined with 1-atm density data in the literature, the high-pressure velocity data provide tight constraints on the equations of state and thermodynamic properties such as the adiabatic temperature gradient for Fe-C and Fe-Si liquids. We will discuss these results with implications to planetary cores.

  15. The spectrum of Fe II

    CERN Document Server

    Nave, Gillian

    2012-01-01

    The spectrum of singly-ionized iron (Fe II) has been recorded using high-resolution Fourier transform and grating spectroscopy over the wavelength range 900 {\\AA} to 5.5 {\\mu}m. The spectra were observed in high-current continuous and pulsed hollow cathode discharges using Fourier transform (FT) spectrometers at the Kitt Peak National Observatory, Tucson, AZ and Imperial College, London and with the 10.7 m Normal Incidence Spectrograph at the National Institute of Standards and Technology. Roughly 12 900 lines were classified using 1027 energy levels of Fe II that were optimized to measured wavenumbers. The wavenumber uncertainties of lines in the FT spectra range from 10-4 cm-1 for strong lines around 4 {\\mu}m to 0.05 cm-1 for weaker lines around 1500 {\\AA}. The wavelength uncertainty of lines in the grating spectra is 0.005 {\\AA}. The ionization energy of (130 655.4+-0.4) cm-1 was estimated from the 3d6(5D)5g and 3d6(5D)6h levels.

  16. Anderson localization of electrons in single crystals: Li (x) Fe(7)Se(8).

    Science.gov (United States)

    Ying, Tianping; Gu, Yueqiang; Chen, Xiao; Wang, Xinbo; Jin, Shifeng; Zhao, Linlin; Zhang, Wei; Chen, Xiaolong

    2016-02-01

    Anderson (disorder-induced) localization, proposed more than half a century ago, has inspired numerous efforts to explore the absence of wave diffusions in disordered media. However, the proposed disorder-induced metal-insulator transition (MIT), associated with the nonpropagative electron waves, has hardly been observed in three-dimensional (3D) crystalline materials, let alone single crystals. We report the observation of an MIT in centimeter-size single crystals of Li x Fe7Se8 induced by lattice disorder. Both specific heat and infrared reflectance measurements reveal the presence of considerable electronic states in the vicinity of the Fermi level when the MIT occurs, suggesting that the transition is not due to Coulomb repulsion mechanism. The 3D variable range hopping regime evidenced by electrical transport measurements at low temperatures indicates the localized nature of the electronic states on the Fermi level. Quantitative analyses of carrier concentration, carrier mobility, and simulated density of states (DOS) fully support that Li x Fe7Se8 is an Anderson insulator. On the basis of these results, we provide a unified DOS picture to explain all the experimental results, and a schematic diagram for finding other potential Anderson insulators. This material will thus serve as a rich playground for both theoretical and experimental investigations on MITs and disorder-induced phenomena. PMID:26989781

  17. TENDÊNCIAS DOS ESTUDOS COM PLANTAS MEDICINAIS NO BRASIL

    Directory of Open Access Journals (Sweden)

    Fernanda Melo Carneiro

    2014-12-01

    Full Text Available As plantas medicinais são utilizadas pelo homem desde o início da história e atualmente empregadas como recursos na medicina alternativa por grande parte da população mundial. Esse uso deve-se à facilidade de acesso às plantas em relação aos medicamentos alopáticos. O objetivo deste trabalho foi, primariamente, desenvolver uma análise cienciométrica sobre as tendências dos estudos com plantas medicinais no Brasil, investigando se o número de trabalhos cresceu ao longo dos anos. Além disso, foi identificamos as principais plantas que são estudadas pelo seu principio medicinal no Brasil. Para a pesquisa foi empregada a base de dados Scielo, com artigos de 1995 a 2011, utilizando a palavra “Planta Medicinal” como palavra-chave. Foram avaliados 329 artigos, mas somente 265 foram compatíveis à pesquisa. Artigos que não foram desenvolvidos no Brasil; que não utilizaram o termo planta medicinal; ou não citaram plantas foram excluídos das análises. Em cada artigo selecionado foram coletadas as seguintes informações: título do artigo, quantidade de autores, instituições responsáveis pelo estudo, local das instituições, ano de publicação, tipo de estudo (ex.: farmacológico, agropecuário e ecológico e as plantas que foram estudadas. Por meio de análises desses dados foi possível verificar as tendências dos estudos com plantas medicinais no Brasil. Conforme esperado, a maior parte dos artigos avaliados estão voltados para a Farmacologia, com aplicação em diversas áreas da saúde e em segundo lugar a Agropecuária, devido ao interesse em desenvolver produtos a partir de plantas para o controle de pragas. Entretanto, verificou-se o emprego em outras áreas, como a Bioquímica, Botânica, Ecologia, Genética/Molecular e Educação que apesar de serem menos frequentes, são essenciais, pois os estudos com plantas medicinais requerem profissionais de múltiplas áreas. Além da investigação da medicina popular

  18. Iron Isotope Fractionations Reveal a Finite Bioavailable Fe Pool for Structural Fe(III) Reduction in Nontronite.

    Science.gov (United States)

    Shi, Bingjie; Liu, Kai; Wu, Lingling; Li, Weiqiang; Smeaton, Christina M; Beard, Brian L; Johnson, Clark M; Roden, Eric E; Van Cappellen, Philippe

    2016-08-16

    We report on stable Fe isotope fractionation during microbial and chemical reduction of structural Fe(III) in nontronite NAu-1. (56)Fe/(54)Fe fractionation factors between aqueous Fe(II) and structural Fe(III) ranged from -1.2 to +0.8‰. Microbial (Shewanella oneidensis and Geobacter sulfurreducens) and chemical (dithionite) reduction experiments revealed a two-stage process. Stage 1 was characterized by rapid reduction of a finite Fe(III) pool along the edges of the clay particles, accompanied by a limited release to solution of Fe(II), which partially adsorbed onto basal planes. Stable Fe isotope compositions revealed that electron transfer and atom exchange (ETAE) occurred between edge-bound Fe(II) and octahedral (structural) Fe(III) within the clay lattice, as well as between aqueous Fe(II) and structural Fe(III) via a transient sorbed phase. The isotopic fractionation factors decreased with increasing extent of reduction as a result of the depletion of the finite bioavailable Fe(III) pool. During stage 2, microbial reduction was inhibited while chemical reduction continued. However, further ETAE between aqueous Fe(II) and structural Fe(III) was not observed. Our results imply that the pool of bioavailable Fe(III) is restricted to structural Fe sites located near the edges of the clay particles. Blockage of ETAE distinguishes Fe(III) reduction of layered clay minerals from that of Fe oxyhydroxides, where accumulation of structural Fe(II) is much more limited.

  19. Iron Isotope Fractionations Reveal a Finite Bioavailable Fe Pool for Structural Fe(III) Reduction in Nontronite.

    Science.gov (United States)

    Shi, Bingjie; Liu, Kai; Wu, Lingling; Li, Weiqiang; Smeaton, Christina M; Beard, Brian L; Johnson, Clark M; Roden, Eric E; Van Cappellen, Philippe

    2016-08-16

    We report on stable Fe isotope fractionation during microbial and chemical reduction of structural Fe(III) in nontronite NAu-1. (56)Fe/(54)Fe fractionation factors between aqueous Fe(II) and structural Fe(III) ranged from -1.2 to +0.8‰. Microbial (Shewanella oneidensis and Geobacter sulfurreducens) and chemical (dithionite) reduction experiments revealed a two-stage process. Stage 1 was characterized by rapid reduction of a finite Fe(III) pool along the edges of the clay particles, accompanied by a limited release to solution of Fe(II), which partially adsorbed onto basal planes. Stable Fe isotope compositions revealed that electron transfer and atom exchange (ETAE) occurred between edge-bound Fe(II) and octahedral (structural) Fe(III) within the clay lattice, as well as between aqueous Fe(II) and structural Fe(III) via a transient sorbed phase. The isotopic fractionation factors decreased with increasing extent of reduction as a result of the depletion of the finite bioavailable Fe(III) pool. During stage 2, microbial reduction was inhibited while chemical reduction continued. However, further ETAE between aqueous Fe(II) and structural Fe(III) was not observed. Our results imply that the pool of bioavailable Fe(III) is restricted to structural Fe sites located near the edges of the clay particles. Blockage of ETAE distinguishes Fe(III) reduction of layered clay minerals from that of Fe oxyhydroxides, where accumulation of structural Fe(II) is much more limited. PMID:27291525

  20. Artritis séptica del pubis en dos deportistas Septic arthritis of the pubic symphysis in two athletes

    Directory of Open Access Journals (Sweden)

    José A. Andrews

    2012-06-01

    Full Text Available La artritis séptica de pubis u osteomielitis púbica es la infección que compromete la sínfisis pubiana y su articulación. Es poco frecuente, representando menos del 1% de las osteomielitis. Afecta más a menudo a atletas jóvenes y a mujeres que se someten a cirugía ginecológica o urológica. Se presenta con fiebre y dolor púbico, irradiado a genitales, que aumenta con la movilización de la cadera lo que produce claudicación de la marcha. Debe hacerse el diagnóstico diferencial con la osteítis del pubis que es una condición inflamatoria estéril. La punción guiada por imagen suele ser necesaria para el diagnóstico diferencial con la osteítis del pubis. El diagnóstico se basa en la clínica apoyada en el aislamiento microbiológico, métodos por imágenes e incremento de las proteínas de fase aguda. Los agentes etiológicos más comúnmente encontrados son Staphylococcus aureus, seguidos de bacilos gram negativos, o pueden ser polimicrobianos en posquirúrgicos. El tratamiento antibiótico se ajusta al germen aislado por cultivo, además de antiinflamatorios y reposo. El desbridamiento quirúrgico se requiere hasta en el 55% de los casos. Se recomiendan antibióticos por 6 semanas. Se presentan dos casos de osteomielitis del pubis por S. aureus, con buena respuesta al tratamiento. Ambos pacientes eran jóvenes y deportistas.Septic arthritis of the pubic symphysis, so called osteomyelitis pubis is the infection which involves pubic symphysis and its joint. It is a rare condition, representing less than one percent of all cases of osteomyelitis. It affects most frequently young athletes and women undergoing gynecologic or urologic surgery. It presents itself with fever and pubic pain which irradiates to the genitals and increases when hip is mobilized, and this fact produces gait claudication. Differential diagnosis should be made with pubic osteitis, which is a sterile inflammatory condition. Diagnosis is based on clinic

  1. Ab initio calculations of the Fe(II) and Fe(III) isotopic effects in citrates, nicotianamine, and phytosiderophore, and new Fe isotopic measurements in higher plants

    Science.gov (United States)

    Moynier, Frédéric; Fujii, Toshiyuki; Wang, Kun; Foriel, Julien

    2013-05-01

    Iron is one of the most abundant transition metal in higher plants and variations in its isotopic compositions can be used to trace its utilization. In order to better understand the effect of plant-induced isotopic fractionation on the global Fe cycling, we have estimated by quantum chemical calculations the magnitude of the isotopic fractionation between different Fe species relevant to the transport and storage of Fe in higher plants: Fe(II)-citrate, Fe(III)-citrate, Fe(II)-nicotianamine, and Fe(III)-phytosiderophore. The ab initio calculations show firstly, that Fe(II)-nicotianamine is ˜3‰ (56Fe/54Fe) isotopically lighter than Fe(III)-phytosiderophore; secondly, even in the absence of redox changes of Fe, change in the speciation alone can create up to ˜1.5‰ isotopic fractionation. For example, Fe(III)-phytosiderophore is up to 1.5‰ heavier than Fe(III)-citrate2 and Fe(II)-nicotianamine is up to 1‰ heavier than Fe(II)-citrate. In addition, in order to better understand the Fe isotopic fractionation between different plant components, we have analyzed the iron isotopic composition of different organs (roots, seeds, germinated seeds, leaves and stems) from six species of higher plants: the dicot lentil (Lens culinaris), and the graminaceous monocots Virginia wild rye (Elymus virginicus), Johnsongrass (Sorghum halepense), Kentucky bluegrass (Poa pratensis), river oat (Uniola latifolia), and Indian goosegrass (Eleusine indica). The calculations may explain that the roots of strategy-II plants (Fe(III)-phytosiderophore) are isotopically heavier (by about 1‰ for the δ56Fe) than the upper parts of the plants (Fe transported as Fe(III)-citrate in the xylem or Fe(II)-nicotianamine in the phloem). In addition, we suggest that the isotopic variations observed between younger and older leaves could be explained by mixing of Fe received from the xylem and the phloem.

  2. El Observatorio de Violencia de Género en Bizkaia (OVGB: una Experiencia de Buenas Prácticas (The Observatory on Gender-based Violence in Bizkaia (OVGB: an Experience of Good Practices

    Directory of Open Access Journals (Sweden)

    Berta Díaz Arbesú

    2015-06-01

    Full Text Available The Observatory on Gender-based Violence in Bizkaia (OVGB emerged as an initiative of the Social Action Department of Bizkaia Provincial Council (DFB in 2003.  It began to operate in 2004. This Observatory has two main objectives: To understand the reality and evolution of the situations of violence against women in Bizkaia.To make recommendations and proposals to improve the services and facilities offered by public institutions in the field of gender-based violence. Its work on compiling data on dealing with situations of gender violence within the social sphere, where there are multiple information sources, is of particular interest (123. Data gathering process coordinated by the Indicators Working Party. Along with the information on a social level, the political and legal data make up a database providing a closer view on the care provided to this collective and the analysis of the evolution.  This knowledge is used to issue recommendations as guidelines for public policies. The work carried out can be found on the OVGB website: http://www.bizkaia.eus/Gizartekintza/Genero_Indarkeria/ca_index.html El Observatorio de Violencia de Género en Bizkaia (OVGB surge como iniciativa del Departamento de Acción Social de la Diputación Foral de Bizkaia (DFB en el año 2003. En 2004 comienzan sus actuaciones. Dos son los objetivos principales de este Observatorio: Conocer la realidad y la evolución de las situaciones de violencia contra las mujeres en Bizkaia.Formular recomendaciones y propuestas de mejora en los servicios y prestaciones que se ofertan desde las instituciones públicas, en el ámbito de la violencia de género. De todo el trabajo desarrollado resulta de especial interés la compilación de los datos de las actuaciones efectuadas en atención a las víctimas de violencia de género dentro del ámbito social, en el que existen múltiples fuentes informativas (123, proceso de recogida de datos coordinado por el Grupo de Trabajo sobre

  3. Depois do pacote e dos cortes de bolsas

    Directory of Open Access Journals (Sweden)

    Romano Roberto

    1998-01-01

    Full Text Available Este texto teve origem em palestra subordinada ao tema "Cenário Nacional da Educação Brasileira e Pós-graduação". Retoma teses do etnólogo Andre Leroi-Gourhan, sobre origem e desenvolvimento das técnicas e dos saberes humanos, confrontando-as com momentos desse processo na educação e na pesquisa que se fez no Brasil, ao longo da história. Aponta-se, desse modo, para as dimensões reduzidas do sistema de ciência e tecnologia aqui produzido, quando confrontado com as necessidades de adaptação ao meio tecnológico mundial, ameaçando de modo permanente a própria adaptação ao meio natural. Investir em saúde, educação, ciência e técnica não é algo que possa ser visto pelo ângulo financeiro: investimentos nestes setores definem, em termos econômicos e antropológicos, a sobrevivência e a expansão bioetnológica de um povo. Sem eles, o que se faz, na verdade, é condenar o coletivo inteiro à morte lenta. Salvo, é claro, os pequenos setores que escapam do inferno, integrando-se em outros coletivos, usando privilégios e tornando-se parte de outros povos. O que podemos fazer? No plano político mais amplo, controle sobre o Executivo, por parte dos outros poderes da República. No plano das universidades, ação dos órgãos colegiados sobre a política da administração, bem como sobre as políticas de financiamento e fomento à pesquisa.

  4. As Limitações dos Sistemas de Metas

    Directory of Open Access Journals (Sweden)

    Mário Teixeira Reis Neto

    2011-04-01

    Full Text Available Neste ambiente de grandes incertezas em que as organizações estão inseridas, a correta utilização de um sistema de medição pode significar vantagem competitiva e desempenho. Este ensaio procura esclarecer os limites dos sistemas de medição, verificando se a utilização de metas de resultado é suficiente para que uma empresa tenha um desempenho superior. O objetivo é analisar a teoria das metas sob um olhar crítico, observando os limites da utilização de diversos tipos de metas, até mesmo no serviço público. Buscou-se fazer uma análise das pesquisas dos autores que defendem a utilização de metas para se ter desempenho e, a partir das suas premissas, analisar os estudos dos autores que as criticam, mostrando que elas podem causar, dependendo da situação, sérios danos financeiros e à imagem da organização. Após essa análise, verificou-se que as metas possuem um importante papel no aumento do desempenho da organização, todavia, deve-se ter certo cuidado na sua utilização, pois elas podem levar as pessoas a comportamentos não éticos, à inibição da cooperação e do aprendizado organizacional, entre outros.

  5. Hallazgo de dos nidos activos de Phytotoma raimondii, Tackzanowski, 1883, cortarrama peruana

    OpenAIRE

    Mario Rosina; Mónica Romo

    2011-01-01

    Dos nidos de Phytotoma raimondii, cortarrama peruana, fueron hallados en la localidad de El Gramadal, distrito de Huarmey, Provincia de Huarmey, Departamento de Áncash. Ambos nidos estaban en arbustos de Grabowskia boerhaaviaefolia palo negro. Uno de ellos contenía dos huevos y el segundo dos pichones de unos diez días a dos semanas de edad. Una semana después, el 14 de abril de 2010 se ubicó muy cerca del segundo nido que ya estaba vacío, a dos volantones que seguían a sus padres. ...

  6. As expectativas dos pais em relação às aulas de instrumento

    OpenAIRE

    Silva, Luís António Teixeira de Lima e

    2015-01-01

    Esta investigação discute as expectativas dos pais dos alunos do ensino articulado de música em relação às aulas de instrumento dos seus filhos. Tomando por base a aparente importância dada pela literatura à relação pai/professor/aluno, esta pesquisa serve o propósito principal de entender as expectativas dos pais em relação às aulas de instrumento dos seus filhos para que o entendimento desta relação possa ser aprofundado. Foi desenvolvido um questionário com questões relac...

  7. Origin of Fe3+ in Fe-containing, Al-free Mantle Silicate Perovskite

    CERN Document Server

    Xu, Shenzhen; Morgan, Dane

    2016-01-01

    We have studied the ferrous (Fe2+) and ferric (Fe3+) iron concentrations in Al-free Fe containing Mg-silicate perovskite (Mg-Pv) at pressure (P), temperature (T), and oxygen fugacity (fO2) conditions related to the lower mantle using a thermodynamic model based on ab-initio calculations. We consider the oxidation reaction and the charge disproportionation reaction, both of which can produce Fe3+ in Mg-Pv. The model shows qualitatively good agreement with available experimental data on Fe3+/{\\Sigma}Fe ({\\Sigma}Fe = total Fe in system), spin transitions, and equations of state. We predict that under lower-mantle conditions Fe3+/{\\Sigma}Fe determined by the charge disproportionation is estimated to be 0.01-0.07 in Al-free Mg-Pv, suggesting that low Al Mg-Pv in the uppermost pyrolitic mantle (where majoritic garnet contains most of the Al) and in the harzburgitic heterogeneities throughout the lower mantle contains very little Fe3+. We find that the volume reduction by the spin transition of the B-site Fe3+ leads...

  8. Magnetic and magnetostrictive properties of amorphous TbFe/FeAl multilayer thin film

    Institute of Scientific and Technical Information of China (English)

    WANG Wei; MI Yiming; QIAN Shiqiang; ZHOU Xiying

    2008-01-01

    Exchange coupling multilayer thin films, which combined giant magnetostriction and soft magnetic properties, were of growing interest for applications. The TbFe/FeAl multilayer thin films were prepared by dc magnetron sputtering onto glass substrates. The microstructure, magnetic, and magnetostrictive properties of TbFe/FeAl multilayer thin film was investigated at different annealing temperatures. The results indicated that the soft magnetic and magnetostrictive properties for TbFe/FeAl multilayer thin film compared with TbFe single layer film were obviously improved. In comparison with the intrinsic coercivity JHc of 59.2 kA/m for TbFe single layer film, the intrinsic coercivity JHc for TbFe/FeAl multilayer thin films rapidly dropped to 29.6 kA/m. After optimal annealing (350 ℃×60 min), magnetic properties of Hs=96 kA/m and JHc=16 kA/m were obtained, and magnetostrictive coefficient could reach to 574×10-6 under an external magnetic field of 400 kA·m-1 for the TbFe/FeAl multilayer thin film.

  9. Magnetic properties of epitaxial-grown exchange-coupled FePt/FeRh bilayer films

    Energy Technology Data Exchange (ETDEWEB)

    Lu, Wei; He, Chenchong; Chen, Zhe; Fan, Junwei; Yan, Biao [Tongji University, School of Materials Science and Engineering, Shanghai Key Lab of D and A for Metal-Functional Materials, Shanghai (China)

    2012-07-15

    In this paper, (001) textured FeRh/FePt bilayer thin film was fabricated by sputtering and the temperature-dependent magnetic behavior of FePt/FeRh bilayers was investigated in detail. The magnetic regime passes from exchange bias to exchange spring when the temperature increases from low to high, resulting from the first-order antiferromagnetic (AFM) to ferromagnetic (FM) phase transition in ordered FeRh alloy layer. Controlling the temperature-allowed modification of the hysteresis loops of exchange-spring-like FeRh/FePt bilayer due to the nanoscale soft/hard interface exchange coupling, our experimental results clearly show that the coercive field decreases strongly at the temperature where FeRh completely transforms to ferromagnetic state. In an exchange-spring-like FeRh/FePt bilayer film, the out-of-plane magnetization reversal process was in two steps and resulted from domain wall nucleation and propagation from the FeRh layer into the FePt layer. (orig.)

  10. Magnetic properties of epitaxial-grown exchange-coupled FePt/FeRh bilayer films

    Science.gov (United States)

    Lu, Wei; He, Chenchong; Chen, Zhe; Fan, Junwei; Yan, Biao

    2012-07-01

    In this paper, (001) textured FeRh/FePt bilayer thin film was fabricated by sputtering and the temperature-dependent magnetic behavior of FePt/FeRh bilayers was investigated in detail. The magnetic regime passes from exchange bias to exchange spring when the temperature increases from low to high, resulting from the first-order antiferromagnetic (AFM) to ferromagnetic (FM) phase transition in ordered FeRh alloy layer. Controlling the temperature-allowed modification of the hysteresis loops of exchange-spring-like FeRh/FePt bilayer due to the nanoscale soft/hard interface exchange coupling, our experimental results clearly show that the coercive field decreases strongly at the temperature where FeRh completely transforms to ferromagnetic state. In an exchange-spring-like FeRh/FePt bilayer film, the out-of-plane magnetization reversal process was in two steps and resulted from domain wall nucleation and propagation from the FeRh layer into the FePt layer.

  11. Enthalpies of mixing in binary Fe-Sb, Ce-Fe and ternary Ce-Fe-Sb liquid alloys

    Energy Technology Data Exchange (ETDEWEB)

    Usenko, Natalia; Kotova, Natalia [Taras Shevchenko National Univ., Kyiv (Ukraine). Dept. of Chemistry; Ivanov, Michael; Berezutski, Vadim [National Academy of Sciences, Kyiv (Ukraine). I. Frantsevich Institute for Problems of Materials Science

    2016-01-15

    The enthalpies of mixing in liquid alloys in the binary Fe-Sb, Ce-Fe and ternary Ce-Fe-Sb systems were determined over a wide range of composition by means of isoperibolic calorimetry in the temperature range 1600-1830 K. The minimum values of the integral enthalpy of mixing (ΔH{sub min}) were determined to be (-2.32 ± 0.22) kJ . mol{sup -1} at x{sub Sb} = 0.5 in the Fe-Sb system, and (-0.97 ± 0.19) kJ . mol{sup -1} at x{sub Ce} = 0.35 in the Ce-Fe system. The enthalpies of mixing in liquid ternary Ce-Fe-Sb alloys were found to increase smoothly from the binary boundary systems Ce-Fe and Fe-Sb towards the Ce-Sb system, reaching the minimum value of (-107.5 ± 3.6) kJ . mol{sup -1} in the vicinity of the phase CeSb.

  12. Santa sexualidad: concepciones de dos monjas sobre feminidad y sexualidad

    OpenAIRE

    Isabel Cristina Giraldo Quijano

    2009-01-01

    En el contexto de la religión católica, la feminidad y la sexualidad femenina se configuran según dogmas y representaciones sociales específicos, en los que la imagen de Cristo -y todo lo que ello implica- actúa como elemento fundamental en la construcción de las concepciones de las mujeres consagradas a la vida religiosa sobre sex ualidad, erotismo, cuerpo. amor. Este artículo pretende explorar desde un punto de vista sociológico las concepciones de dos monjas sobre los temas mencionados....

  13. Mercosur post elecciones: posibles escenarios dos paradigmas en disputa

    OpenAIRE

    Lagarde Munin, Oscar Andrés; Mucciaccia, Facundo

    2014-01-01

    Al analizar la historia del Mercosur, se observan claramente dos fases bien diferenciadas. En la primera década (años 90) el proceso estuvo fuertemente influenciado por el llamado regionalismo abierto, siguiendo una lógica estrictamente comercial propia de la hegemonía neoclásica de entonces; mientras que en la segunda década se produjo un cambio de paradigma, traducido en una mayor intervención del Estado como rector del proceso de integración y la consecuente modificación de las agendas, e...

  14. A natural product based DOS library of hybrid systems.

    Science.gov (United States)

    Prabhu, Ganesh; Agarwal, Shalini; Sharma, Vijeta; Madurkar, Sanjay M; Munshi, Parthapratim; Singh, Shailja; Sen, Subhabrata

    2015-05-01

    Here we described a natural product inspired modular DOS strategy for the synthesis of a library of hybrid systems that are structurally and stereochemically disparate. The main scaffold is a pyrroloisoquinoline motif, that is synthesized from tandem Pictet-Spengler lactamization. The structural diversity is generated via "privileged scaffolds" that are attached at the appropriate site of the motif. Screening of the library compounds for their antiplasmodial activity against chloroquine sensitive 3D7 cells indicated few compounds with moderate activity (20-50 μM). A systematic comparison of structural intricacy between the library members and a natural product dataset obtained from ZINC(®) revealed comparable complexity. PMID:25794788

  15. Efeito dos incêndios florestais na qualidade do ar

    OpenAIRE

    Miranda, Ana Isabel

    1998-01-01

    Os incêndios florestais podem ser considerados como um processo de combustão natural em grande escala, que consome diversas espécies vegetais numa área geográfica específica Consequentemente, consistem numa fonte potencial de elevadas quantidades de poluentes para a atmosfera, sendo indispensável conhecer o seu impacto na qualidade do ar. O objectivo principal deste trabalho consiste no estudo do efeito das emissões dos incêndios florestais na qualidade do ar. Para tal, foram d...

  16. Preventive conservation applied to "Casa dos Patudos" oil painting collection

    Directory of Open Access Journals (Sweden)

    Mafalda Fernandes

    2016-01-01

    Full Text Available The main objective of this work was the identification of specific risks affecting the collection of oil paintings in the historic house "Casa dos Patudos" (Alpiarça, Portugal and the development of mitigation strategies for the risks encountered. The methodology used was proposed by the Canadian Conservation Institute. The results showed that the main risks affecting this collection result from incorrect handling, increase in paint detachment due to the maintenance of paintings with paint lifting on display, occurrence of insect pests, high fluctuations in relative humidity and, excessive exposure to ultraviolet radiation. Several preventive conservation strategies to mitigate these risks are proposed.

  17. Dos teorías sobre la modernidad.

    OpenAIRE

    Taylor, Charles

    2008-01-01

    Hay dos maneras de interpretar la Modernidad; a través de un enfoque cultural o a través de una enfoque acultural. La explicación acultural de la Modernidad conlleva considerar que diferentes espacios gegráficos afrontan un mismo tipo de cambio histórico. Al contrario una visión cultural subraya la existencia de modernidades múltiples construidas a través de procesos históricos distintos. There are two ways to approach Modernity; one of them is the cultural approach and the other is the acult...

  18. A novela dos caças-bombardeiros

    Directory of Open Access Journals (Sweden)

    Henrique Rattner

    2011-02-01

    Full Text Available O governo brasileiro está discutindo e adiando sucessivamente a aquisição de aviões de combate dos mais avançados que podem cumprir missões de interceptação e de combate ar–ar e realizar ataques com bombas e foguetes. 

  19. Retratos telejornalísticos dos direitos humanos no Brasil

    OpenAIRE

    Francisco de Paula Araújo

    2014-01-01

    Este artigo procura averiguar a forma como a temática dos direitos humanos é apresentada pelos meios de comunicação de massa, notadamente a televisão. Destaca da programação jornalística da televisão aberta brasileira dois telejornais: Jornal Nacional (TV Globo) e Jornal da Record (TV Record). A pesquisa é de cunho exaustivo, utilizando todas as reportagens indexadas ou que apresentem em seu contexto as expressões direitos humanos, direito humano, direitos fundamentais, direito fundamental, d...

  20. Violencia en relaciones íntimas en dos etapas evolutivas

    OpenAIRE

    Adriana Cáceres; José Cáceres

    2006-01-01

    En este estudio descriptivo mediante encuestas se analiza la frecuencia y la intensidad de violencia física, psicológica y sexual de la que manifiestan haber sido objeto hombres y mujeres (n = 60) en el contexto de una relación íntima. Se estudiaron las respuestas de dos tipos de parejas, los que inician su relación (novios, n = 30) y aquellos que llevan varios años en el contexto de una relación conflictiva (matrimonios, n = 30) a la Escala de Ajuste Diádico de Spanier y al Ín...

  1. Compatibilidad sexual entre dos tipos de Hylocerus (Cactaceae)

    OpenAIRE

    Roberta Castillo M.; Manuel Livera M.; Alicia E. Brechú F.; Judith Márquez-Guzmán

    2003-01-01

    Dos de los tipos de pitahaya mas cultivados en la Península de Yucatán, México, difieren principalmente por el color de su cáscara, el primero es de color rojo (Uqroo1), perteneciente a Hylocereus undatus, mientras que en el segundo es color amarillo claro (Uqroo2), hasta el momento también identificado como H. undatus; este último es mas dulce. En ambos tipos de pitahayas, se realizaron autopolinizaciones y polinizaciones cruzadas directas y recíprocas, con el propósito de evaluar el efecto ...

  2. Percepção da imagem corporal dos adolescentes

    OpenAIRE

    Silva, Raquel Alexandra Teixeira da

    2012-01-01

    Trabalho apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciada em Enfermagem Os indivíduos adolescentes deparam-se com diversas mudanças, quer a nível físico, quer a nível psicossocial, tendo por vezes dificuldades em lidar com essas modificações. Essas mudanças têm muitas vezes repercussões a nível da autoconfiança e auto-estima, que consequentemente se pode traduzir em vulnerabilidade nos próprios adolescentes. As alterações ...

  3. A CUMULATIVIDADE E A CONTABILIDADE DOS VERBOS EM KARITIANA

    Directory of Open Access Journals (Sweden)

    Luciana Sanchez-Mendes

    2013-07-01

    Full Text Available O tema deste artigo são as propriedades semânticas dos predicados verbais em Karitiana, uma língua indígena brasileira. Sua tese central é a de que o domínio verbal da língua é ao mesmo tempo cumulativo e contável, embora as duas noções pareçam teoricamente excludentes. Os dados da língua com pluracionalidade verbal e advérbios de frquência e de grau apoiam a tese.

  4. Impacto dos choques petrolíferos na economia portuguesa

    OpenAIRE

    Valentim, André Faustino

    2014-01-01

    O mercado perolífero tem vindo a representar um papel importante ao nível macroeconómico, principalmente após o significativo aumento do seu preço verificado em 1973. O principal objetivo deste estudo consiste em averiguar se existe, de facto, uma relação de causalidade à Granger entre as variações dos preços do petróleo e o desempenho macroeconomico português, utilizando dados trimestrais de 1995 a 2012 e contemplando diferentes medidas para os preços do petróleo. Através da m...

  5. El enigma de los dos Hipólitos

    Directory of Open Access Journals (Sweden)

    Claudio Pierantoni

    2006-01-01

    Full Text Available El artículo evidencia, por un lado, que las diferencias entre dos grupos de obras dentro del corpus hipolitiano, notadas por Nautin, y después desarrolladas sobre todo por Simonetti, son notables y deben ser aceptadas como demostración de la existencia de dos autores diferentes, abandonándose la todavía difundida "suspensión del juicio" sobre el tema, aun cuando algunos puntos secundarios permanecen inciertos. Por otro lado, sostiene que la escisión del autor romano en dos personas diferentes, inaugurada por el mismo Nautin (con su fantomático Josipo, y aceptada después -aunque con más prudencia- por Simonetti, Guarducci y otros a partir de 1989, no cuenta con un sólido apoyo. En cambio, fuertes indicios apuntan a la identificación entre los dos, y por tanto, a juicio del autor, debe aceptarse solo la existencia de: un Hipólito escritor romano y presbítero cismático (más tarde reconciliado por su martirio y venerado en la tradición romana; y de un Hipólito escritor asiático, obispo de sede desconocidaThis article, on the one hand, shows that the points of difference between the two groups of works among the Corpus Hippolytianum noted by Nautin, as well as developed and demonstrated above all by Simonetti, are fully convincing and must be accepted to demonstrate the existence of two different authors, even when several points of detail remain uncertain. On the other hand, the author also finds that the excision of the Roman personality into two, inaugurated by Nautin (with his phantom-like "Josipo", and accepted afterwards -albeit more prudently- by Simonetti, Guarducci and others beginning in 1989, has no firm base. Meanwhile, solid indicators point to an identification between the two, and therefore the existence of Hippolyte, Roman writer and schismatic presbyter (later reconciled by martyrdom and venerated in the Roman tradition must be accepted, in the author's judgment, at the side of Hippolyte, Asian writer and bishop of

  6. Analysis of the SYN Flood DoS Attack

    Directory of Open Access Journals (Sweden)

    Mitko Bogdanoski

    2013-06-01

    Full Text Available The paper analyzes systems vulnerability targeted by TCP (Transmission Control Protocol segments when SYN flag is ON, which gives space for a DoS (Denial of Service attack called SYN flooding attack or more often referred as a SYN flood attack. The effects of this type of attack are analyzed and presented in OPNET simulation environment. Furthermore, the paper presents two anomaly detection algorithms as an effective mechanism against this type of attack. Finally, practical approaches against SYN flood attack for Linux and Windows environment which are followed by are shown.

  7. Carlos Pfeifer : dos fragmentos docentes en un discurso moderno

    OpenAIRE

    Hernández Soriano, Ricardo

    2012-01-01

    [SPA] Dos proyectos de Carlos Pfeifer en Granada escriben un relato que demuestra la trascendencia pedagógica que los equipamientos docentes tuvieron durante la modernidad: la Escuela de Maestría con su exactitud formal y el Colegio Mayor Loyola con su experimentación geométrica justifican la validez de una manera universal de proyectar, a pesar de la crisis del Movimiento Moderno. Escogidos antecedentes argumentados en la necesidad de formular relecturas a la modernidad arquitectónica ilustr...

  8. Seeded preparation of ultrathin FeS2 nanosheets from Fe3O4 nanoparticles

    Science.gov (United States)

    Li, Tingting; Liu, Huiwen; Wu, Zhennan; Liu, Yi; Guo, Zuoxing; Zhang, Hao

    2016-06-01

    FeS2 nanomaterials with two-dimensional features hold great promise for electrochemical and photovoltaic applications. However, the preparation of ultrathin FeS2 nanosheets is still challenging because of the lack of a tailor-made approach. In this work, FeS2 nanosheets with a thickness of 2.1 nm are prepared through a Fe3O4-seeded approach. Uniform Fe3O4 nanoparticles are foremost synthesized via the standard method in organic media. The injection of a S solution leads to the replacement of O in Fe3O4 through anion-exchange, which generates (110) facet-enriched FeS2 nuclei. The subsequent (110) facet-mediated oriented attachment and fusion of FeS2 nuclei produce ultrathin FeS2 nanosheets. As catalysts in the hydrogen evolution reaction, FeS2 nanosheets exhibit good electrochemical activity.FeS2 nanomaterials with two-dimensional features hold great promise for electrochemical and photovoltaic applications. However, the preparation of ultrathin FeS2 nanosheets is still challenging because of the lack of a tailor-made approach. In this work, FeS2 nanosheets with a thickness of 2.1 nm are prepared through a Fe3O4-seeded approach. Uniform Fe3O4 nanoparticles are foremost synthesized via the standard method in organic media. The injection of a S solution leads to the replacement of O in Fe3O4 through anion-exchange, which generates (110) facet-enriched FeS2 nuclei. The subsequent (110) facet-mediated oriented attachment and fusion of FeS2 nuclei produce ultrathin FeS2 nanosheets. As catalysts in the hydrogen evolution reaction, FeS2 nanosheets exhibit good electrochemical activity. Electronic supplementary information (ESI) available: EDX, AFM images, small-angle XRD pattern, SAED pattern, and TEM images of FeS2 nanosheets. See DOI: 10.1039/c6nr02211a

  9. Orientation relationship of eutectoid FeAl and FeAl2

    Science.gov (United States)

    Scherf, A.; Kauffmann, A.; Kauffmann-Weiss, S.; Scherer, T.; Li, X.; Stein, F.; Heilmaier, M.

    2016-01-01

    Fe–Al alloys in the aluminium range of 55–65 at.% exhibit a lamellar microstructure of B2-ordered FeAl and triclinic FeAl2, which is caused by a eutectoid decomposition of the high-temperature Fe5Al8 phase, the so-called ∊ phase. The orientation relationship of FeAl and FeAl2 has previously been studied by Bastin et al. [J. Cryst. Growth (1978 ▸), 43, 745] and Hirata et al. [Philos. Mag. Lett. (2008 ▸), 88, 491]. Since both results are based on different crystallographic data regarding FeAl2, the data are re-evaluated with respect to a recent re-determination of the FeAl2 phase provided by Chumak et al. [Acta Cryst. (2010 ▸), C66, i87]. It is found that both orientation relationships match subsequent to a rotation operation of 180° about a 〈112〉 crystallographic axis of FeAl or by applying the inversion symmetry of the FeAl2 crystal structure as suggested by the Chumak data set. Experimental evidence for the validity of the previously determined orientation relationships was found in as-cast fully lamellar material (random texture) as well as directionally solidified material (∼〈110〉FeAl || solidification direction) by means of orientation imaging microscopy and global texture measurements. In addition, a preferential interface between FeAl and FeAl2 was identified by means of trace analyses using cross sectioning with a focused ion beam. On the basis of these habit planes the orientation relationship between the two phases can be described by (01)FeAl || (114) and [111]FeAl || [10]. There is no evidence for twinning within FeAl lamellae or alternating orientations of FeAl lamellae. Based on the determined orientation and interface data, an atomistic model of the structure relationship of Fe5Al8, FeAl and FeAl2 in the vicinity of the eutectoid decomposition is derived. This model is analysed with respect to the strain which has to be accommodated at the interface of FeAl and FeAl2. PMID:27047304

  10. Equilibrium Fe isotope fractionation between inorganic aqueous Fe(III) and the siderophore complex, Fe(III)-desferrioxamine B

    DEFF Research Database (Denmark)

    Dideriksen, Knud; Baker, Joel A.; Stipp, Susan Louise Svane

    2008-01-01

    be controlled by isotope fractionation between the free and complexed iron.We have determined the equilibrium Fe isotope fractionation induced by organic ligand activity in experiments with solutions having co-existing inorganic Fe(III) species and siderophore complexes, Fedesferrioxamine B (at pH 2). The two......In oxic oceans, most of the dissolved iron (Fe) exists as complexes with siderophore-like, strongly coordinating organic ligands. Thus, the isotope composition of the little amount of free inorganic Fe that is available for precipitation and preservation in the geological record may largely...... for the slower stage, indicating that approximately 40% reequilibration may take place during the separation of the two pools. To further test if the induced precipitation leads to experimental artefacts, the fractionation during precipitation of inorganic Fe was determined. Assuming a Rayleigh...

  11. Exchange biased FeNi/FeMn bilayers with coercivity and switching field enhanced by FeMn surface oxidation

    Directory of Open Access Journals (Sweden)

    A. V. Svalov

    2013-09-01

    Full Text Available FeNi/FeMn bilayers were grown in a magnetic field and subjected to heat treatments at temperatures of 50 to 350 °C in vacuum or in a gas mixture containing oxygen. In the as-deposited state, the hysteresis loop of 30 nm FeNi layer was shifted. Low temperature annealing leads to a decrease of the exchange bias field. Heat treatments at higher temperatures in gas mixture result in partial oxidation of 20 nm thick FeMn layer leading to a nonlinear dependence of coercivity and a switching field of FeNi layer on annealing temperature. The maximum of coercivity and switching field were observed after annealing at 300 °C.

  12. A comparative study of a Heusler alloy Co2FeGe using LSDA and LSDA+U

    International Nuclear Information System (INIS)

    We have calculated the on-site Coulomb repulsion (U) for the transition elements Co and Fe. To study the impact of Hubbard potential or on-site Coulomb repulsion (U) on structural and electronic properties the calculated values of U were added on GGA and LSDA. We performed the structure optimization of Co2FeGe based on the generalized gradient approximation (GGA and GGA+U). The calculation of electronic structure was based on the full potential linear augmented plane wave (FP-LAPW) method and local spin density approximation (LSDA) as well as exchange correlation LSDA+U. The Heusler alloy Co2FeGe fails to give the half-metallic ferromagnetism (HMF) when treated with LSDA. The LSDA+U gives a good result to prove that Co2FeGe is a HMF with a large gap of 1.10 eV and the Fermi energy (EF) lies at the middle of the gap of minority spin. The calculated density of states (DOS) and band structure show that Co2FeGe is a HMF when treated with LSDA+U.

  13. A comparative study of a Heusler alloy Co{sub 2}FeGe using LSDA and LSDA+U

    Energy Technology Data Exchange (ETDEWEB)

    Rai, D.P., E-mail: dibyaprakashrai@gmail.com [Department of Physics, Mizoram University, Aizawl 796004 (India); Shankar, A.; Sandeep [Department of Physics, Mizoram University, Aizawl 796004 (India); Ghimire, M.P. [Nepal Academy of Science and Technology, Kathmandu (Nepal); Thapa, R.K. [Department of Physics, Mizoram University, Aizawl 796004 (India)

    2012-09-15

    We have calculated the on-site Coulomb repulsion (U) for the transition elements Co and Fe. To study the impact of Hubbard potential or on-site Coulomb repulsion (U) on structural and electronic properties the calculated values of U were added on GGA and LSDA. We performed the structure optimization of Co{sub 2}FeGe based on the generalized gradient approximation (GGA and GGA+U). The calculation of electronic structure was based on the full potential linear augmented plane wave (FP-LAPW) method and local spin density approximation (LSDA) as well as exchange correlation LSDA+U. The Heusler alloy Co{sub 2}FeGe fails to give the half-metallic ferromagnetism (HMF) when treated with LSDA. The LSDA+U gives a good result to prove that Co{sub 2}FeGe is a HMF with a large gap of 1.10 eV and the Fermi energy (E{sub F}) lies at the middle of the gap of minority spin. The calculated density of states (DOS) and band structure show that Co{sub 2}FeGe is a HMF when treated with LSDA+U.

  14. Adherence to good practices in membrane premature rupture. Perinatology Service. University Hospital “Dr. Gustavo Aldereguía Lima”, Cienfuegos city. From January to December 2002. Adherencia a buenas prácticas en rotura prematura de membranas. Servicio Perinatología. Hospital "Dr. Gustavo Aldereguia Lima". Cienfuegos. Enero- diciembre 2002.

    Directory of Open Access Journals (Sweden)

    Yosleidy Capote Fragoso

    2004-12-01

    Full Text Available Fundament:Nursing good practice demands standardizationof care,in such a way that they guide and unite the different ways of performance. Objetive: to determine the adherence of the care plan to the guide of good nursing practice in the premature rupture of the membranes and the level of the staff for the level of preparation for its performance in the Service of Perinatology. Methods: Descriptive, correlational and prospective study applied to 622 pregnant women admitted at the Perinatology Service of ¨Dr. Gustavo Aldereguía Lima¨ Hospital from Cienfuegos province who had a rupture of the membrane. 311 patients (50% of the universe, selected with probabilistic simple randomized way, without exclusive criteria were studied. Adherence was measured by using evaluation means. Results:43 % of the assessed clinical records, received between 95 and 100 points . Among the 16 nurses evaluated , 43,7 % had difficulties, being 25 % technicians.

    Fundamento:Las buenas prácticas de enfermería exigen la estandarización de los cuidados, de modo que guíe y unifique los diferentes modos de actuación. Objetivo: Determinar la adherencia del plan de cuidado a la guía de la buena práctica de enfermería en la rotura prematura de membranas y el grado de preparación del personal para su realización en el Servicio de Perinatología.Métodos: Estudio descriptivo, correlacionar y retrospectivo realizado en un universo de 622 gestantes ingresadas en el Servicio de Perinatología del Hospital ¨Gustavo Aldereguía Lima¨ de Cienfuegos con rotura prematura de membranas, del que se tomó una muestra de 311 pacientes, el 50 % del universo, escogidas por el método probabilistico al azar simple por sorteo, sin criterios de exclusión. La adherencia fue medida a través de instrumentos de

  15. CANINE EHRLICHIOSIS IN CAMPOS DOS GOYTACAZES, RIO DE JANEIRO, BRAZIL ERLIQUIOSE CANINA EM CAMPOS DOS GOYTACAZES, RIO DE JANEIRO, BRASIL

    Directory of Open Access Journals (Sweden)

    Orlando Augusto Melo Jr.

    2007-12-01

    Full Text Available

    It was evaluated 1.576 dogs with the intention to search positivity and to analyze hematological aspects of dogs infected with Ehrlichia spp. in Campos dos Goytacazes. The research of blood-parasites and complete blood counts had been carried out, to determine the occurrence and hematological aspects of dogs infected for Ehrlichia spp. The diagnosis was based by visualization of the Ehrlichia spp. morulae in the leukocytes, its great majority was in monocyte, being considered infected 219 (13,89% dogs. Anemia, thrombocytopenia, nuclear left deviation neutrophils, eosinopenia and absolute monocytopenia was been the most hematological alterations found.

    Key-words: Blood smears, Ehrlichia spp., hematology.

    Com o propósito de pesquisar a positividade e analisar os aspectos hematológicos de cães infectados com Ehrlichia spp. na cidade de Campos dos Goytacazes, avaliaram-se 1.576 cães. Realizaram-se pesquisa de hemocitozoários e hemograma para se determinar a ocorrência e os aspectos hematológicos dos cães infectados por Ehrlichia spp. Baseou-se o diagnóstico no achado de mórulas de Ehrlichia spp. nos leucócitos, em sua maioria nos monócitos, sendo considerados infectados 219 (13.89% cães.   Anemia, trombocitopenia, DNNE leve, eosinopenia e monocitopenia absolutas foram as alterações hematológicas mais observadas.

    Palavras-chaves: Esfregaço sangüíneo, hematologia, Ehrlichia spp.

  16. Análise dos co-movimentos entre os mercados de capitais do Brasil e dos EUA

    Directory of Open Access Journals (Sweden)

    Daniel Reed Bergmann

    2011-01-01

    Full Text Available Neste artigo, a teoria de cópulas é utilizada para analisar os co-movimentos entre os mercados de capitais do Brasil e dos EUA. Na finalidade de implementação de uma estratégia de alocação de ativos é importante entender os eventos extremos - tanto os positivos (boom como os negativos (crashes - e seus efeitos sobre os mercados. Os índices de mercado usados são o IBOVESPA e o S&P 500 cobrindo o período de 03/2001 a 04/2007. A aderência aos log-retornos das principais cópulas encontradas na literatura financeira é avaliada. Os seguintes critérios foram escolhidos: o Log-likelihod, o critério de informação de Akaike e o critério de informação bayesiano. Os resultados mostram que a cópula de Joe-Clayton simetrizada é a mais adequada para modelar a estrutura de dependência entre os log-retornos do IBOVESPA e os do S&P500. Este trabalho difere de alguns estudos já realizados [e.g. Mendes e Moretti(2005 e Canela e Collazo(2005], pois leva em consideração a modelagem de cópulas dinâmicas introduzida por Patton (2006. Finalmente, através dos índices de dependência caudal ao longo do tempo, pode-se concluir que a ocorrência de eventos extremos negativos (crashes no mercado norte americano tende a afetar mais o mercado brasileiro quando da comparação da ocorrência dos eventos extremos positivos (booms.

  17. Influence of FeEDDS, FeEDTA, FeDTPA, FeEDDHA, and FeSO4 on Marigold Growth and Nutrition, and Substrate and Runoff Chemistry

    Science.gov (United States)

    Objectives of the study were to determine effects of Fe source on plant growth, plant nutrition, substrate chemistry and runoff chemistry. Iron source (FS) treatments consisted of Fe-aminopolycarboxylic acid (APCA) complexones iron ethylenediaminetetraacetic acid (FeEDTA), iron [S, S']-ethylenediam...

  18. Origin of magnetostriction in Fe-Ga

    DEFF Research Database (Denmark)

    Mudivarthi, Chaitanya; Laver, Mark; Cullen, James;

    2010-01-01

    This paper investigates the origin of large magnetostriction in Fe-Ga alloys using small-angle neutron scattering (SANS) and Kerr microscopy. The SANS data for a single-crystal, electron irradiated, and quenched Fe81Ga19 sample under externally applied magnetic and elastic fields revealed the exi...

  19. Vaningi: O javali e a identidade dos Vanir

    Directory of Open Access Journals (Sweden)

    Hélio Pires

    2015-10-01

    Full Text Available Os Vanir, um dos grupos divinos do panteão nórdico, são frequentemente descritos como deuses da fertilidade e da terceira função no sistema proposto por Dumézil. Uma definição a meu ver simplista e anacrónica, dado que nem as grandes divindades nórdicas são meras abstrações funcionais, nem é de esperar que um panteão que conhecemos por fontes do século XIII tenha uma estrutura e dinâmica idênticas às que, hipoteticamente, existiam milénios antes entre os proto-indo-europeus. A chave para a identidade dos deuses Vanir deve ser antes procurada no javali, animal que, nas fontes nórdicas, surge profundamente ligado aos gémeos Freyr e Freyja e que tem uma simbologia que abarca não só a fertilidade, mas também a guerra.

  20. Aspectos dos líquidos cefalorraquidianos nas meningites bacterianas

    Directory of Open Access Journals (Sweden)

    Claudia E. O. Pires de Campos

    1994-06-01

    Full Text Available Foram colhidos 1815 líquidos cefalorraquidianôs de doentes internados com meningite, no Hospital Emílio Ribas, São Paulo, durante os meses de maio a outubro de 1989. Neisseria meningitidis 56%, dos quais 44% do tipo B; Haemophilus influenzae 17%, sendo 72 % isoladas de neonatos até 3 anos; Streptococcus pneumoniae 14%, dos quais 60% isolados de recém nascidos a 1 ano de idade. O estudo citoquímico liquórico mostrou: celularidade: global > 500cel/mm³ e específica > 70%; proteínas > 90mg/dl e glicose Samples of 1815 cerebrospinal fluid (CSF were studied in a meningitis outbreak during 1989 in São Paulo, Brazil. Neisseria meningitis 56% with 44% type B, Haemophilus influenzae 17%, from which 72% in children (days to 3-year old and Streptococcus pneumoniae 14% from which 60% in children (day to 1- year old of443 (24 %of allstrains. Cytochemistry study showed: purulent or turbidity aspects in 70 to 79% positive bacterioscopy or culture of CSF; white cells count > 500/mm³; glucose 90mg/dl in 90% of all patients. We concluded that: CSF prognostic factors: (aspect and cytochemistry were correlated with bacterial meningitis. Bacterioscopy and positive cultures were correlated to NM, SP and HI isolation from these patients (Goodman Test.

  1. Aspectos dos líquidos cefalorraquidianos nas meningites bacterianas

    Directory of Open Access Journals (Sweden)

    Claudia E. O. Pires de Campos

    1994-06-01

    Full Text Available Foram colhidos 1815 líquidos cefalorraquidianôs de doentes internados com meningite, no Hospital Emílio Ribas, São Paulo, durante os meses de maio a outubro de 1989. Neisseria meningitidis 56%, dos quais 44% do tipo B; Haemophilus influenzae 17%, sendo 72 % isoladas de neonatos até 3 anos; Streptococcus pneumoniae 14%, dos quais 60% isolados de recém nascidos a 1 ano de idade. O estudo citoquímico liquórico mostrou: celularidade: global > 500cel/mm³ e específica > 70%; proteínas > 90mg/dl e glicose < 45mg/dl em 90% e celularidade < 500cel/mm³ entre 2 a 6% nos três tipos de meningites avaliadas. A bacterioscopia e o citoquímico Uquóricos foram decisivos na orientação da cultura epreditivos no diagnóstico etiológico dessas meningites (Teste de Goodman.

  2. Estudo dos caracteres de uma amostra boliviana de Trypanosoma cruzi

    Directory of Open Access Journals (Sweden)

    Gentilda K. Funayama

    1974-04-01

    Full Text Available Amostra de T. cruzi, mediante a inoculação em camundongos brancos jovens, foi isolada de fezes de exemplares de T. infestans capturados em Vitichi, Bolívia e denominada amostra Bolívia. Essa amostra, que se comporta de um modo peculiar em reações de aglutinação, segundo Siqueira, Ribeiro e Fernandes, em 1973, mostrou-se patogênica para camundongos, infectando 100% dos animais inoculados, quer com formas metacíclicas de triatomíneos, quer com formas sanguícolas de doadores com infecção aguda. As formas sanguícolas, em camundongos, medem 23,37 μ de comprimento total médio e tem índice nuclear de 0,94. Nos camundongos mortos durante a fase aguda os ninhos de leishmânias são abundantes, sobretudo no coração. A infecção dos camundongos é grave com curto período prepatente, parasitemia elevada e alta taxa de letalidade. A amostra Bolívia confere, aos animais que sobrevivem, alto grau de resistência contra reinfecção pela amostra Y. Cultiva-se bem em meios líquidos (Warren e difásicos (NNN e evolui regularmente em várias espécies de triatomíneos testadas.

  3. The future of multimodal corpora O futuro dos corpora modais

    Directory of Open Access Journals (Sweden)

    Dawn Knight

    2011-01-01

    Full Text Available This paper takes stock of the current state-of-the-art in multimodal corpus linguistics, and proposes some projections of future developments in this field. It provides a critical overview of key multimodal corpora that have been constructed over the past decade and presents a wish-list of future technological and methodological advancements that may help to increase the availability, utility and functionality of such corpora for linguistic research.Este artigo apresenta um balanço do estado da arte da linguística de corpus multimodal e propõe a projeção de desenvolvimentos futuros nessa área. Um resumo crítico dos corpora multimodais-chave que foram construídos na última década é apresentado, assim como uma lista de desenvolvimentos tecnológicos e metodológicos futuros que podem auxiliar na disponibilização e utilização, bem como na funcionalidade, de tais corpora para a pesquisa linguística.

  4. MANETs performance analysis with dos attack at different routing protocols

    Directory of Open Access Journals (Sweden)

    Alaa Zain

    2015-05-01

    Full Text Available A Mobile Ad-Hoc Networks (MANET is widely used in many industrial and people's life applications, such as earth monitoring, natural disaster prevention, agriculture biomedical related applications, and many other areas. Security threat is one of the major aspects of MANET, as it is one of the basic requirements of wireless sensor network, yet this problem has not been sufficiently explored. The main purpose of this paper is to study different MANETs routing protocols with three scenarios of Denial of Service (DoS attacks on network layer using proactive routing protocol i.e. Optimized Link State Routing (OLSR and Reactive routing protocols like Ad hoc On-Demand Distance Vector (AODV, Hybrid routing protocols like Geographic Routing Protocol (GRP. Moreover, a comparative analysis of DoS attacks for throughput, Data loss, delay and network load is taken into account. The performance of MANET under the attack is studied to find out which protocol is more vulnerable to the attack and how much is the impact of the attack on both protocols. The simulation is done using OPNET 17.

  5. Diagnóstico dos aneurismas cerebrais por angiotomografia tridimensional

    Directory of Open Access Journals (Sweden)

    Andrade Guilherme Cabral de

    2003-01-01

    Full Text Available A angiotomografia é método diagnóstico rápido e minimamente invasivo que passou a ser utilizado recentemente nos casos de aneurisma intracraniano, possuindo 100% de especificidade e podendo atingir 95% de sensibilidade, na avaliação dos aneurismas do círculo de Willis, substituindo a angiografia digital, mas não em todos os casos. Apresentamos nossa experiência na avaliação do exame de angiotomografia tridimensional em período de 2 anos, comprendido entre junho de 1997 e junho 1999, em que foram realizados exames de angiotomografia tridimensional para detecção de aneurismas intracranianos em 136 pacientes Em 118 pacientes foi realizada apenas angiotomografia e em 18 casos foi realizada além da angiotomografia tridimensional, também a angiografia digital convencional. O exame de angiotomografia tridimensional possui baixo risco, sendo melhor utilizada na detecção dos aneurismas com diâmetro maior que 3mm. Possui algumas limitações, como os aneurismas muito pequenos <3mm aneurismas da carótida cavernosa e da circulação posterior, como também a não realização do exame dinâmico.

  6. Biological, chemical, electrochemical, and photochemical fractionation of Fe isotopes

    Science.gov (United States)

    John, S.; King, A.; Hutchins, D.; Adkins, J. F.; Fu, F.; Wasson, A.; Hodierne, C.

    2012-12-01

    Iron is an important nutrient for life in the ocean, where low Fe concentrations often limit the growth of marine phytoplankton. Fe stable isotope ratios (δ56Fe) are a potentially valuable new tool for studying the marine biological cycling of Fe. In order to effectively use Fe isotopes as a biological tracer, however, it is important to parameterize the isotope effect for biological uptake. We have therefore measured the biological fractionation of Fe isotopes by the marine diatoms Thalassiosira pseudonana, T. oceanica, and Phaeodactylum tricornutum in culture. During biological Fe acquisition, Fe(III) is often first reduced from Fe(III) to Fe(II), either in seawater or at the cell surface. Therefore, we have also measured the isotope effect for Fe(III) reduction by chemical, electrochemical, and photochemical processes. Diatoms were cultured in EDTA or NTA buffered media under varying Fe concentrations from Fe-sufficiency to Fe-limitation. Biological fractionation of Fe isotopes was determined by comparing δ56Fe of phytoplankton to the media. The use of a cell wash allows us to distinguish between isotopic fractionation during extracellular adsorption and intracellular uptake. The biological fractionation of Fe isotopes is highly dependent on culture conditions with Δδ56Fe ranging from +0.6 ‰ to -0.5 ‰ depending on ligand composition, species, and Fe-limitation status. Isotope effects for chemical, electrochemical, and photochemical reduction of Fe(III) to Fe(II) span an even larger range. For example, chemical reduction of Fe(III)-EDTA with hydroxylamine hydrochloride has an isotope effect of Δδ56Fe = -2.8 ‰. By contrast, photochemical reduction of Fe(III)-EDTA has an isotope effect of Δδ56Fe = +0.9 ‰. Isotope effects for electrochemical reduction of Fe(III) using a rotating disc electrode allow for greater control of experimental conditions, such as differentiating between the effects of electric potential (voltage) and mass transport (diffusion

  7. STUDY ON DETERMINATION OF TRACE Fe BY Fe(Ⅱ)-VA THIN LAYER RESIN PHASE SPECTROPHOTOMETRY

    Institute of Scientific and Technical Information of China (English)

    SONG Huanyu; YAN Yongsheng; WANG Yun

    2006-01-01

    A new method for the determination of Fe by thin layer resin phase spectrophotometry in alkali condition was reported. The complex anion formed by Fe(Ⅱ) and VA was absorbed on the 717#resin and Fe was determined by making thin layer. This method had a high sensitivity (ε620=3.0×105 L/mol·cm), which was 15 times higher than that of liquid phase spectrophotometry. It had been proved a satisfactory precision (5.0μg Fe, n=6, RSD=1.8%). The trace Fe in natural water was determined and the recovery was 97%.

  8. Structural and magnetic properties of Ce/Fe and Ce/FeCoV multilayers

    Energy Technology Data Exchange (ETDEWEB)

    Tixier, S.; Boeni, P. [Paul Scherrer Inst. (PSI), Villigen (Switzerland); Mannix, D.; Stirling, W.G. [Liverpool Univ. (United Kingdom); Lander, G.H.

    1997-09-01

    Ce/Fe and Ce/FeCoV multilayers have been grown by magnetron sputtering. The interfaces are well defined and the layers are crystalline down to an individual layer thickness of 20 A. Ce/FeCoV multilayers show sharper interfaces than Ce/Fe but some loss of crystallinity is observed. Hysteresis loops obtained by SQUID show different behaviour of the bulk magnetisation as a function of the layer thickness. Fe moments are found by Moessbauer spectroscopy to be perpendicular to the interfaces for multilayers with small periodicity. (author) 2 figs., 2 refs.

  9. Fe1+-Fe2+ charge transfer process after 57Co decay in ZnTe

    International Nuclear Information System (INIS)

    We have performed Moessbauer absorption and emission experiments on 57Fe impurities in ZnTe. A transient Fe1+ charge state has been observed below 130K in the emission spectra. The dynamics of the Fe1+-Fe2+ charge transfer was shown to obey an activation process with an activation energy of 0.09eV. Low temperature Raman relaxation rates within the Fe2+ spin-orbit levels are found to be at least 100 times faster in ZnTe than in ZnS

  10. Structural Models of the [Fe4S4] Clusters of Homologous Nitrogenase Fe Proteins

    OpenAIRE

    Blank, Michael A.; Lee, Chi Chung; Hu, Yilin; Hodgson, Keith O.; Hedman, Britt; Ribbe, Markus W.

    2011-01-01

    The iron (Fe) proteins of molybdenum (Mo)-, vanadium (V)- and iron (Fe)-only nitrogenases are encoded by nifH, vnfH and anfH, respectively. While the nifH-encoded Fe protein has been extensively studied over the past years, information regarding the properties of the vnfH- and anfH-encoded Fe proteins has remained scarce. Here we present a combined biochemical, electron paramagnetic resonance (EPR) and x-ray absorption spectroscopy (XAS) analysis of the [Fe4S4] clusters of NifH, VnfH and AnfH...

  11. Spectral distribution of Fe2+ photoionization cross section in InP:Fe

    International Nuclear Information System (INIS)

    Measurements of Fe2+ (5E) photoionization cross section in InP at 800K, using constant current photoconductivity technique, were done. The spectrum presents a threshold energy of ∼ 0,65 eV due to the transition from Fe2+ charge state, in the ground state, to Fe3+ with an electron emission for the minimum conduction band. In the measurement of photoluminescence at ∼ 20K, a wide emission of Fe complexe with the strong lattice interaction. In order to analyse the experimental data of Fe2+ cross section in InP, a theoretical model was used. (M.C.K.)

  12. Formation of hard magnetic L10-FePt/FePd monolayers from elemental multilayers

    OpenAIRE

    Goo, Nam Hoon

    2007-01-01

    In this thesis, ordered L10-FePt and FePd films of different nominal compositions are prepared from Fe/Pt and Fe/Pd multilayers by annealing. In case of the L10-FePt films the composition of the films is modified by changing the individual elemental layer thicknesses in the multilayer precursors. This simple variation of the composition is the great advantage of the multilayer approach compared to sputtering single alloy layer from an alloy target. The formation mechanism of the fct phase fro...

  13. Caracterização dos utilizadores e dos serviços culturais do Parque Florestal de Monsanto

    OpenAIRE

    Vasco, Ana Rita Afonso, 1991-

    2015-01-01

    Tese de mestrado. Biologia (Ecologia e Gestão Ambiental). Universidade de Lisboa, Faculdade de Ciências, 2014 Na última década, o aumento da população urbana e da procura por oportunidades de recreio tem acentuado a pressão sobre os espaços verdes. Desencadeando conflitos e novos desafios de gestão, originados pela falta de informações sobre as necessidades e expectativas dos vários grupos de utilizadores, e em que o planeamento urbano é muitas vezes projectado sem ter em consideração as n...

  14. ANÁLISE DO IMPACTO DOS ROYALTIES DO PETRÓLEO NO DESENVOLVIMENTO LOCAL DOS MUNICÍPIOS POTIGUARES

    Directory of Open Access Journals (Sweden)

    Ridalvo Medeiros Alves de Oliveira

    2009-12-01

    Full Text Available Os royalties do petróleo são compensações financeiras consequentes da exploração de petróleo ou gás natural. Devido à relevância da receita dos royalties do petróleo para a política fiscal e de desenvolvimento econômico do Rio Grande do Norte, e em particular, para os municípios que compõem a Área de Petróleo Potiguar, se fez necessário estabelecer um estudo sobre as suas influências na dinâmica socioeconômica dessa região. O objetivo geral desse artigo é investigar as contribuições das receitas extraordinárias, originadas da atividade industrial de petróleo no território potiguar, para a melhoria da qualidade de vida destes municípios. Assim, através da evolução dos índices de IDH-M vislumbrou-se observar se os royalties têm contribuído para o desenvolvimento humano nos municípios em estudo. Os dados para a pesquisa foram obtidos junto ao IBGE, ANP e FERMURN, e para analisar aevolução das duas variáveis – royalties e IDH-M – foi utilizada a metodologia descritiva. Ao final do artigo conclui-se que um dos fatores que ocasionaram na melhoria da dinâmica de desenvolvimento dos municípios da região foi o incremento dessa receita extraordinária nosorçamentos municipais, permitindo investimentos em programas que possibilitaram melhoria nas variáveis: renda, longevidade e educação. O resultado do coeficiente de Pearson (0,689apresentou que existe uma correlação positiva entre as variáveis no período de 1995 a 2000.

  15. Distribución del Ingreso en Argentina: Periodo 1980-1998.: Dos Décadas, Dos Modelos

    OpenAIRE

    Carlos A. Rodríguez

    1999-01-01

    Este trabajo presenta una descripción de la evolución de los ingresos absolutos y relativos en Argentina durante las ultimas dos décadas a la luz de las políticas macroeconómicas vigentes. Algunos de los resultados son contrastados con datos similares para la economía de los Estados Unidos. Si bien se nota una tendencia persistente hacia una mas desigual distribución del ingreso a lo largo de los 18 años, los resultados de la economía de mercado (1990-98) permiten una mayor dosis de optimismo...

  16. FePt/FeRh双层薄膜的结构和磁性%Structures and magnetic properties of FePt/FeRh bilayer films

    Institute of Scientific and Technical Information of China (English)

    赵湖钧; 朱艳艳; 曾道富; 李鱼辉; 郑富; 裴文利; 江川元太; 吉村哲; 齐藤准

    2015-01-01

    用磁控溅射法,在加热到400℃的MgO(001)基片上,得到25 nm厚的A1相FePt软磁薄膜,经过热处理使之发生不同程度的A1 →L10相转变,在450℃继续生长50 nm厚的FeRh,并在相同温度连续保温24 h,使FeRh层转变为有序的B2相,得到具有热致反铁磁-铁磁转变性质的FePt/FeRh双层复合磁性薄膜.结果表明,FePt层和FeRh层都有(001)取向;在生长FeRh层之前,如果FePt层没有或者未完全转变为硬磁的L10相,可以使FeRh层的反铁磁-铁磁转变温度由100℃提高到200℃;沿垂直于膜面的方向施加磁场,双层薄膜的室温磁化曲线呈方形,矫顽力可达到7.4 kOe;升温使FeRh层转变为软铁磁性,反磁化过程的磁化强度在2个特征磁场附近发生跳跃,显示双层膜中形成了磁性弹簧,矫顽力可下降一半以上.FeRh反铁磁-铁磁转变温度升高的原因在于有适量的Pt从FePt层析出并扩散进入FeRh层,用于制作热辅助复合垂直磁存储介质,有助于提高稳定性.

  17. Life without Fe-S clusters.

    Science.gov (United States)

    Rocha, Agostinho G; Dancis, Andrew

    2016-03-01

    Fe-S clusters are critically important cofactors implicated in numerous cellular processes, including respiration, amino acid biosynthesis, cofactor biosynthesis, tRNA modification, DNA repair and regulation of gene expression. In the accompanying manuscript, Tanaka et al. show that reengineering of the isoprenoid biosynthetic pathway in E. coli (to bypass the usage of essential Fe-S cluster proteins by inserting the mevalonate pathway) can offset the indispensability of the Fe-S cluster biosynthetic systems. They show that the resulting Δisc Δsuf double mutants supplemented with mevalonate can grow slowly without detectable Fe-S cluster proteins. This result is astounding and raises interesting questions about what is essential and what is dispensable in the compendium of Fe-S cluster protein functions in this cell. PMID:26560645

  18. Availability and toxicity of Fe(Ⅱ) and Fe(Ⅲ) in Caco-2 cells

    Institute of Scientific and Technical Information of China (English)

    Wan-ling HE; Ying FENG; Xiao-li LI; Yan-yan WEI; Xiao-e YANG

    2008-01-01

    The objective of the present study was to compare the toxicity and availability of Fe(Ⅱ) and Fe(Ⅲ) to Caco-2 cells.Cellular damage was studied by measuring cell proliferation and lactate dehydrogenase (LDH) release. The activities of two major antioxidative enzymes [superoxide dismutase (SOD) and glutathione peroxidase (GPx)] and differentiation marker (alkaline phosphatase) were determined after the cells were exposed to different levels of iron salts. The cellular iron concentration was investigated to evaluate iron bioavailability. The results show that iron uptake of the cells treated with Fe(Ⅱ) is significantly higher than that of the cells treated with Fe(Ⅲ) (P<0.05). Fe(Ⅱ) at a concentration>1.5 mmol/L was found to be more effective in reducing cellular viability than Fe(Ⅲ). LDH release investigation suggests that Fe(Ⅱ) can reduce stability of the cell membrane. The activities of SOD and GPx of the cells treated with Fe(Ⅱ) were higher than those of the cells treated with Fe(Ⅲ), although both of them increased with raising iron supply levels. The results indicate that both Fe(Ⅱ) and Fe(Ⅲ) could reduce the cellular antioxidase gene expression at high levels.

  19. Fe Spin Reorientation across the Metamagnetic Transition in Strained FeRh Thin Films

    Science.gov (United States)

    Bordel, C.; Juraszek, J.; Cooke, David W.; Baldasseroni, C.; Mankovsky, S.; Minár, J.; Ebert, H.; Moyerman, S.; Fullerton, E. E.; Hellman, F.

    2012-09-01

    A spin reorientation accompanying the temperature-induced antiferromagnetic (AFM) to ferromagnetic (FM) phase transition is reported in strained epitaxial FeRh thin films. Fe57 conversion electron Mössbauer spectrometry showed that the Fe moments have different orientations in FeRh grown on thick single-crystalline MgO and in FeRh grown on ion-beam-assist-deposited (IBAD) MgO. It was also observed, in both samples, that the Fe moments switch orientations at the AFM to FM phase transition. Perpendicular anisotropy was evidenced in the AFM phase of the film grown on IBAD MgO and in the FM phase of that grown on regular MgO. Density-functional theory calculations enabled this spin-reorientation transition to be accurately reproduced for both FeRh films across the AFM-FM phase transition and show that these results are due to differences in strain.

  20. Magnetic Characterization of CoFeB/MgO and CoFe/MgO Interfaces

    Energy Technology Data Exchange (ETDEWEB)

    Negusse,E.; Lussier, A.; Dvorak, J.; Idzerda, Y.; Shinde, S.; Nagamine, Y.; Furukawa, S.; Tsunekawa, K.; Djayaprawira, D.

    2007-01-01

    The use of CoFeB ferromagnetic electrodes in place of CoFe has been shown to significantly increase the tunneling magnetoresistance (TMR) of MgO based magnetic tunnel junctions (MTJs). By using soft x-ray scattering techniques, we show that the behavior of the magnetic moments located at the CoFe-MgO interface are drastically different from the rest of the CoFe film, whereas the magnetic response of the CoFeB-MgO interfacial moments is coherent with the film's bulk. Our results support the view that the high TMR values observed in MgO based MTJs with CoFeB electrodes are due to the uniform magnetic response of the entire CoFeB electrode including the MgO interfacial moments.

  1. Estilos de liderança dos diretores técnicos e satisfação dos colaboradores : estudo realizado em IPSS`s dos Distritos da Guarda e Viseu

    OpenAIRE

    Gomes, Susana Maria Lopes

    2014-01-01

    As Instituições Particulares de Solidariedade Social (IPSS`s) caraterizam-se, actualmente, por serem organizações dinâmicas e em constante mudança, que a par das organizações empresariais necessitam de profissionais detentores de competências de liderança, capazes de influenciar os comportamentos dos colaboradores, levando-os à conquista dos objetivos organizacionais e, simultaneamente, promotores da satisfação dos elementos da equipa relativamente às varias dimensões do trabalho. O presen...

  2. Spin polarization effect for Fe2 molecule

    Institute of Scientific and Technical Information of China (English)

    Yan Shi-Ying; Zhu Zheng-He

    2006-01-01

    This paper uses the density functional theory (DFT)(B3p86) of Gaussian03 to optimize the structure of Fe2 molecule. The result shows that the ground state for Fe2 molecule is a 9-multiple state, which shows spin polarization effect of Fe2 molecule of transition metal elements for the first time. Meanwhile, we have not found any spin pollution because the wavefunction of the ground state does not mingle with wavefunctions with higher energy states. So, that the ground state for Fe2 molecule is a 9-multiple state is indicative of the spin polarization effect of Fe2 molecule of transition metal elements. That is, there exist 8 parallel spin electrons. The non-conjugated electron is greatest in number. These electrons occupy different spacious tracks, so that the energy of the Fe2 molecule is minimized. It can be concluded that the effect of parallel spin of the Fe2 molecule is larger than the effect of the conjugated molecule, which is obviously related to the effect of electron d delocalization. In addition, the Murrell-Sorbie potential functions with the parameters for the ground state and other states of Fe2 molecule are derived. Dissociation energy De for the ground state of Fe2 molecule is 2.8586ev, equilibrium bond length Re is 0.2124nm, vibration frequency ωe is 336.38 cm-1. Its force constants f2, f3, and f4 are 1.8615aJ·nm-2, -8.6704a J·nm-3, 29.1676aJ·nm-4 respectively. The other spectroscopic data for the ground state of Fe2 moleculeωeχe, Be, αe are 1.5461 cm-1, 0.1339 cm-1, 7.3428×10-4 cm-1 respectively.

  3. Fe-Mo double perovskite: From small clusters to bulk material

    Energy Technology Data Exchange (ETDEWEB)

    Carvajal, E., E-mail: ecarvajalq@ipn.mx [Instituto Politecnico Nacional, ESIME-Culhuacan, Av. Santa Ana 1000, C.P. 04430 Mexico, D.F. (Mexico); Oviedo-Roa, R. [Programa de Investigacion en Ingenieria Molecular, Instituto Mexicano del Petroleo, Eje Central Lazaro Cardenas Norte 152, 07730 Mexico, D.F. (Mexico); Cruz-Irisson, M. [Instituto Politecnico Nacional, ESIME-Culhuacan, Av. Santa Ana 1000, C.P. 04430 Mexico, D.F. (Mexico); Navarro, O. [Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, A.P. 70-360, 04510 Mexico, D.F. (Mexico)

    2012-09-20

    To understand the differences in behaviour between up- and down-spin electrons observed in the half-metallic Sr{sub 2}FeMoO{sub 6} double perovskite, the density of states (DOS) was studied for the (FeO{sub 6}){sup -4} and (MoO{sub 6}){sup -6} octahedral clusters using first-principles density functional theory within the generalised gradient approximation (GGA) scheme and the Perdew-Burke-Ernzerhof (PBE) functional. Our results reveal that half-metallic character is present, even starting from an isolated (FeO{sub 6}){sup -4} cluster, and is a consequence of spin decoupling of antibonding hybridisations between iron t{sub 2g} states and oxygen p states (t{sub 2g}{sup a} states), i.e., t{sub 2g}{sup a} states lie below the Highest Occupied Molecular Orbital (HOMO) in the up-spin channel, whereas they lie above the HOMO level in the down-spin channel. The spin-induced shifting between up-spin and down-spin DOS situates the HOMO in such a way that the molecular orbitals oxygen p states (p bands) are fully spin-paired by octet electrons. Thus, the down-spin channel has metallic character because the HOMO lies just at the p bands, and the up-spin channel is semiconducting because the HOMO falls within the energy gap between the t{sub 2g}{sup a} and e{sub g}{sup a} bands. Finally, the (MoO{sub 6}){sup -6} octahedron does not inhibit the perovskite half-metallic character since this cluster has a zero total spin.

  4. Field induced spin reorientation in orthoferrites DyFeO3, HoFeO3 and ErFeO3

    International Nuclear Information System (INIS)

    Spin reorientations of the antiferromagnetically coupled system of Fe3+ spins in DyFeO3, HoFeO3 and ErFeO3 by applied magnetic fields have been studied by Moessbauer spectroscopy on single crystal samples. (orig.)

  5. Hyperfine fields of Fe in Nd2Fe14BandSm2Fe17N3

    Science.gov (United States)

    Akai, Hisazumi; Ogura, Masako

    2015-03-01

    High saturation magnetization of rare-earth magnets originates from Fe and the strong magnetic anisotropy stems from f-states of rare-earth elements such as Nd and Sm. Therefore the hyperfine fields of both Fe and rare-earth provide us with important pieces of information: Fe NMR enable us to detect site dependence of the local magnetic moment and magnetic anisotropy (Fe sites also contribute to the magnetic anisotropy) while rare-earth NQR directly give the information of electric field gradients (EFG) that are related to the shape of the f-electron cloud as well as the EFG produced by ligands. In this study we focus on the hyperfine fields of materials used as permanent magnets, Nd2Fe14BandSm2Fe17N3 from theoretical points of view. The detailed electronic structure together with the hyperfine interactions are discussed on the basis of the first-principles calculation. In particular, the relations between the observed hyperfine fields and the magnetic properties are studies in detail. The effects of doping of those materials by other elements such as Dy and the effects of N adding in Sm2Fe17N3 will be discussed. This work was supported by Elements Strategy Initiative Center for Magnetic Materials Project, the Ministry of Education, Culture, Sports, Science and Technology, Japan.

  6. Unraveling The Origin of Enhanced Field Emission from Irradiated FeCo-SiO2 Nanocomposites: A Combined Experimental and First-Principles Based Study.

    Science.gov (United States)

    Sarker, Debalaya; Bhattacharya, Saswata; Rodriguez, Raul D; Sheremet, Evgeniya; Kabiraj, D; Avasthi, D K; Zahn, Dietrich R T; Schmidt, H; Srivastava, P; Ghosh, S

    2016-02-01

    This work is driven by the vision of engineering planar field emitters with ferromagnetic metal-insulator nanocomposite thin films, using swift heavy ion (SHI) irradiation method. FeCo nanoparticles inside SiO2 matrix, when subjected to SHI get elongated. Using this, we demonstrate here a planar field emitter with maximum current density of 550 μA/cm(2) at an applied field of 15 V/μm. The film, irradiated with 5 × 10(13) ions/cm(2) fluence (5e13) of 120 MeV Au(9+) ions, shows very high electron emitting quantum efficiency in comparison to its unirradiated counterpart. Surface enhanced Raman spectroscopy analysis of unirradiated and 5e13 films further confirms that the field emission (FE) enhancement is not only due to surface protrusions but also depends on the properties of entire matrix. We find experimental evidence of enhanced valence band density of states (VB DOS) for 5e13 film from XPS, which is verified in the electronic structure of a model FeCo cluster from first-principles based calculations combining density functional theory (DFT) and molecular dynamics (MD) simulations. The MD temperature is selected from the lattice temperature profile inside nanoparticles as deduced from thermal spike model. Increasing the irradiation fluence beyond 5e13, results in reduced VB DOS and melting of surface protrusions, thus causing reduction of FE current density. We finally conclude from theoretical analysis that change in fluence alters the co-ordination chemistry followed by the charge distribution and spin alignment, which influence the VB DOS and concurrent FE as evident from our experiment. PMID:26812580

  7. Enhancement of magnetoresistance using CoFe/Ru/CoFe synthetic ferrimagnetic pinned layer in BiFeO{sub 3} based spin-valves

    Energy Technology Data Exchange (ETDEWEB)

    Naganuma, Hiroshi; Kubota, Miho; Inami, Nobuhito; Kawada, Yuki; Oogane, Mikihiko; Ando, Yasuo [Department of Applied Physics, Graduate School of Engineering, Tohoku University, 6-6-05 Aoba Aramaki Aoba-ku, Sendai 980-8579 (Japan); Bae, In-Tae [Small Scale Systems Integration and Packaging Center, State University of New York at Binghamton, Binghamton, New York 13902 (United States); Miyazaki, Takamichi [Tohoku University, Department of Instrumental Analysis, 6-6-11 Aoba, Aramaki, Aoba, Sendai 980-8579 (Japan); Mizukami, Shigemi [WPI Advanced Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan); Han, X. F. [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

    2012-08-13

    SrTiO{sub 3} (100) sub/BiFeO{sub 3}/CoFe/Ru/CoFe/Cu/CoFe/Ta structure was prepared by a combination of chemical solution deposition and sputtering method, and followed by a systematical investigation for the structural, magnetic and magnetoresistance properties at room temperature (RT) as a function of CoFe and Ru thicknesses. It was revealed that introduction of synthetic CoFe/Ru/CoFe as a pinning layer increased the giant magentoresistance (MR) ratio to 8.3% at RT. This enhancement of MR ratio might be attributed to (i) the increase of pinning field, and (ii) suppression of the influence of the surface roughness of BiFeO{sub 3} by inserting the synthetic CoFe/Ru/CoFe layer.

  8. Magnetic nanowires (Fe, Fe-Co, Fe-Ni – magnetic moment reorientation in respect of wires composition

    Directory of Open Access Journals (Sweden)

    Kalska-Szostko Beata

    2015-03-01

    Full Text Available Magnetic nanowires of Fe, Fe-Co, and Fe-Ni alloy and layered structure were prepared by electrochemical alternating current (AC deposition method. The morphology of the nanowires in and without the matrix was studied by energy dispersive X-ray spectroscopy (EDX, scanning electron microscopy (SEM, and X-ray diffraction (XRD, respectively. The wires either show strong dependence on the combination of elements deposition (alloy or layered or chemical composition (Co or Ni. The magnetic properties of the nanostructures were determined on the basis of Mössbauer spectroscopy (MS.

  9. Conjunto de dos escuelas, en Zellerstrasse, Stuttgart, Alemania

    Directory of Open Access Journals (Sweden)

    Kammerer, Hans

    1969-04-01

    Full Text Available This integrated project brings together two new schools, the «Lehrschule» for underdeveloped children and the «Sprachschule» for deaf children who have speach defects. Each school has its own gymnasium, and the «Lehrschule» has eight classrooms, a natural science and a carpentry classroom, a kitchen for cookery instruction, and a sewing room, and another for religious teaching, as well as a library. The «Sprachschule» has four classrooms, for deaf children and four for children having speach defects. There are rooms for natural science tuition, for carpentry, and also for religious instruction and the use of hearing devices. There is also a library. There are no significant novelties in the construction method, but the schools include all modem advances, as well as works of art that enhance its quality.El conjunto construido agrupa dos nuevas Escuelas: la «Lehenschule » para niños retrasados y la «Sprachheilschule» para niños sordos o que tienen algún defecto de pronunciación. Cada escuela posee un gimnasio propio; y concretando, la «Lehenschule» dispone: de ocho clases; una sala de Ciencias Naturales y dos de carpintería; una cocina para la enseñanza de la confección de guisos domésticos; una sala de costura y otra para instrucción religiosa, y una biblioteca. En la «Sprachheilschule» se distribuyen: cinco clases para niños sordos y cuatro para niños con defectos de dicción; una sala de Ciencias Naturales, otra de costura, dos de carpintería, una de instrucción religiosa y otra de audiometría, y una biblioteca. El sistema constructivo no ofrece novedades de interés, pero se ha dotado al edificio de todos los adelantos técnicos, incorporándole obras de arte que resaltan su categoría.

  10. Ordering phenomena in FeCo-films and Fe/Cr-multilayers: an X-ray and neutron scattering study

    Energy Technology Data Exchange (ETDEWEB)

    Nickel, B.

    2001-07-01

    The following topics are covered: critical phenomena in thin films, critical adsorption, finite size scaling, FeCo Ising model, kinematical scattering theory for thin films, FeCo thin films, growth and characterisation of single crystal FeCo thin films, X-ray study of ordering in FeCo films, antiferromagnetic coupling in Fe/Cr multilayers, neutron scattering on Fe/Cr multilayers (WL)

  11. Fe stable isotope fractionation in modern and ancient hydrothermal Fe-Si deposits

    Science.gov (United States)

    Moeller, K.; Schoenberg, R.; Thorseth, I. H.; Øvreås, L.; Pedersen, R.

    2010-12-01

    Modern iron-silica deposits of small yellow to rust coloured mounds and chimney-like structures were found in a low-temperature venting area distal to a white smoker type hydrothermal vent site at the south-western part of the Mohns Ridge, North Atlantic. Individual stratified mm to cm thick laminated layers within these structures are largely composed of branching, twisted filaments resembling encrusted stalks of Fe-oxidising bacteria. DNA analyses have confirmed the presence of both Fe-oxidising (Mariprofundus ferrooxidans and other ζ-Proteobacteria) and Fe-reducing bacteria (Shewanellaceae). Similar morphologic features, such as several mm thick red hematite-rich laminae and micron-scale filamentous structures concentrated in discrete laminae, have also been found in Early Ordovician volcanogenic massive sulphide (VMS) hosted jasper deposits in the Løkken-Høydal area, Norway [1]. These filamentous structures are believed to be formed by Fe-oxidising bacteria similar to Mariprofundus ferrooxidans [2]. Here, we compare the Fe isotope composition of these two different types of Fe-Si deposits with the aim to gain further information about deposition mechanisms and the role of microorganisms in Fe redox cycling of deep-sea hydrothermal systems. Fe isotope compositions of the modern biogenic Fe-Si deposit vary between -2.09 and -0.66 ‰ in δ56Fe values, a range that is comparable to late Archaean to early Proterozoic banded iron formations. The ~490 Ma old Løkken jaspers show a similar variation, but with significantly higher δ56Fe values ranging from -0.39 to +0.89 ‰. The Fe isotopic composition of the Løkken jaspers clearly correlates with morphological features with the lowest δ56Fe values in layered and the highest ones in brecciform jaspers. Our data demonstrate that variations in Fe isotope compositions of the modern Fe-Si deposit cannot be explained by a single process, but rather reflect the full complexity of Fe redox cycling within deep

  12. A novel spin modulation of work function for C adsorbed Cr/Fe(001 metal gate

    Directory of Open Access Journals (Sweden)

    Kehua Zhong

    2012-12-01

    Full Text Available Work functions and magnetic moments of C adsorbed Cr/Fe(001 surfaces with different C coverages θ and magnetic alignments (parallel or antiparallel between Cr and Fe atom moments are investigated using first-principles methods based on density functional theory. The calculated results reveal that the spin configuration plays a significant role in determining the work function of the systems. The work functions of the systems with parallel states are evidently larger than those with antiparallel states. Moreover, for θ≤0.5 ML, with increasing value of θ, the work function increases from 4.23 eV to 5.13 eV for antiparallel states and from 4.47 eV to 5.44 eV for parallel states. While for θ>0.5 ML, the work function decreases with increasing value of θ. It can be also found that, for θ≤0.5 ML, the smaller the Cr and Fe magnetic moments are, the lower the Fermi energy EF is and the larger the work functions of the systems are. Based on analysis and discussion, we conclude that the changes of the work functions and magnetic moments are mainly determined by those of Fermi level and density of state (DOS induced by the spin polarization, the electron transfer and the surface structure. Our work strongly suggests that controlling the magnetic states is a promising way for modulating the work function of magnetic metal gate.

  13. Visualización de funciones de dos variables

    Directory of Open Access Journals (Sweden)

    Busto Caballero, Ana Isabel

    2004-01-01

    Full Text Available Los alumnos de la licenciatura en Administración y Dirección de Empresas tienen dentro de los contenidos del programa de la asignatura “Matemáticas Empresariales I”, el estudio de las funciones de varias variables: continuidad, derivabilidad, diferenciabilidad y optimización. Este tema es complicado de visualizar con tiza y pizarra, a diferencia del mismo estudio realizado para funciones reales de variable real. El objetivo de este trabajo es presentar una metodología para llevar el ordenador a clase y visualizar las gráficas de las funciones de dos variables y sus características específicas, que faciliten la comprensión del tema por parte del alumno, y conseguir que los resultados obtenidos analíticamente tengan un aspecto gráfico e intuitivo.

  14. Há alternativas ao uso dos transgênicos?

    Directory of Open Access Journals (Sweden)

    Hugh Lacey

    2007-07-01

    Full Text Available A existência ou não de alternativa ao uso de transgênicos capaz de satisfazer a demanda mundial por alimento e nutrientes é uma questão que permanece aberta à investigação científica. A importância dos transgênicos ainda não está bem fundamentada no conhecimento científico disponível, em parte porque as conquistas e o potencial da agroecologia não foram objeto de atenção científica suficiente.Whether or not there are alternatives to using transgenics, that would be able to satisfy the world's food and nutrition needs, remains open to further scientific investigation. The necessity for using transgenics is not currently well based on available scientific knowledge, in part because the achievements and potential of agroecology have received insufficient scientific attention.

  15. Efeitos dos choques fiscais sobre o mercado de trabalho brasileiro

    Directory of Open Access Journals (Sweden)

    Diogo Baerlocher Carvalho

    2013-06-01

    Full Text Available Esse trabalho tem por objetivo entender quais os efeitos dos choques fiscais sobre o mercado de trabalho brasileiro. Em particular, utiliza se uma abordagem SVAR para avaliar esses efeitos sobre o emprego e o salário real. Os choques fiscais são identificados a partir da imposição de restrições de sinais puras sobre a relação dinâmica entre os gastos do governo, o produto real e a oferta de trabalho. As restrições são obtidas a partir de funções de resposta a impulso Bayesianas derivadas de um modelo DSGE na tradição da Nova Síntese Neoclássica. As funções de resposta a impulso obtidas a partir da abordagem SVAR mostram que choques fiscais aumentam o salário real e o emprego.

  16. Há alternativas ao uso dos transgênicos?

    OpenAIRE

    Hugh Lacey

    2007-01-01

    A existência ou não de alternativa ao uso de transgênicos capaz de satisfazer a demanda mundial por alimento e nutrientes é uma questão que permanece aberta à investigação científica. A importância dos transgênicos ainda não está bem fundamentada no conhecimento científico disponível, em parte porque as conquistas e o potencial da agroecologia não foram objeto de atenção científica suficiente.Whether or not there are alternatives to using transgenics, that would be able to satisfy the world's...

  17. Dos teorías explicativas del orden social

    OpenAIRE

    Capdevielle, Julieta María

    2009-01-01

    ¿Cómo es posible el orden social? Constituye uno de los interrogantes centrales de las ciencias sociales. A lo largo de este artículo centramos la mirada en dos teorías que pretenden brindar una explicación a esta problemática: la teoría de la Acción Comunicativa de Jürgen Habermas y la teoría de las prácticas sociales de Pierre Bourdieu. Analizar el orden social desde ambas teorías de ningún modo implica identificar a los autores con aquellas perspectivas teóricas que, desde E. Durkheim y pa...

  18. Sexualidade dos adolescentes e VIH/SIDA : conhecer para educar

    OpenAIRE

    Lopes, João Carlos Fernandes

    2006-01-01

    A ONUSIDA elege, como aposta fundamental para conter a propagação do VIH/SIDA, a mobilização dos jovens no sentido de adoptarem comportamentos seguros que deverão manter ao longo da vida. Neste contexto, a escola surge como o palco privilegiado para desenvolver acções tendentes à prevenção do VIH/SIDA, uma vez que é o espaço onde os adolescentes passam a maioria do seu tempo. Para que os programas vejam aumentada a sua potencial eficácia, devem ser o mais específicos possível, pelo que o seu ...

  19. Desordens no metabolismo dos aminoácidos

    OpenAIRE

    Costa, Sofia Ferreira da

    2013-01-01

    Os erros inatos do metabolismo consistem numa condição genética em que ocorre uma mutação ao nível dos genes que codificam enzimas envolvidas num determinado processo metabólico; tal mutação origina a deficiência de uma enzima, o que faz com que o processo metabólico não ocorra. A consequência pode passar pela acumulação do substrato duma reação no organismo, pela deficiência de produto dessa mesma reação, pela acumulação de metabolitos intermediários da reação, pela falta de feedback negativ...

  20. Document image archive transfer from DOS to UNIX

    Science.gov (United States)

    Hauser, Susan E.; Gill, Michael J.; Thoma, George R.

    1994-01-01

    An R&D division of the National Library of Medicine has developed a prototype system for automated document image delivery as an adjunct to the labor-intensive manual interlibrary loan service of the library. The document image archive is implemented by a PC controlled bank of optical disk drives which use 12 inch WORM platters containing bitmapped images of over 200,000 pages of medical journals. Following three years of routine operation which resulted in serving patrons with articles both by mail and fax, an effort is underway to relocate the storage environment from the DOS-based system to a UNIX-based jukebox whose magneto-optical erasable 5 1/4 inch platters hold the images. This paper describes the deficiencies of the current storage system, the design issues of modifying several modules in the system, the alternatives proposed and the tradeoffs involved.

  1. Tomasello y Stern: Dos perspectivas actuales incluyentes del Desarrollo Infantil

    Directory of Open Access Journals (Sweden)

    Mata Isabel López

    2011-01-01

    Full Text Available El presente artículo tiene como objetivo ilustrar dos perspectivas actuales del desarrollo infantil incluyentes más que excluyentes -Michael Tomasello (cognitivo y Daniel Stern (social-subjetivo-, en cuanto a que integran a su explicación los descubrimientos de las capacidades tempranas del bebé -realizados a partir de 1970/80- y, sin renunciar al paradigma teórico particular del que provienen, reconocen junto a estas competencias tempranas el rol fundamental de los diversos factores intervinientes en el desarrollo -lo innato y lo ambiental (social y cultural-, los diferentes métodos de investigación y las limitaciones de una mirada reduccionista. Además, postulan que se hace necesaria la conversación entre las diferentes perspectivas teóricas, para lograr una descripción del infante como una unidad.

  2. Magnetic and structural properties of nitrided Fe and FeTi thin films

    CERN Document Server

    Bonder, M J

    2001-01-01

    presence of weak perpendicular anisotropy occurring as the bilayer thickness increased. As the bilayer thickness was increased there was an asymptotic approach of the magnetization to the level of the unexposed materials. The presence of the perpendicular anisotropy was maintained for a larger parameter space. In both series the anisotropy is attributed to stress induced by the substrate, Nitriding Fe and FeTi using the aforementioned technique provides a controlled and viable way to alter the magnetic and structural properties. This thesis investigates the magnetic and structural properties of Fe and Fe sub 8 sub 5 Ti sub 1 sub 5 thin films nitrided using a nitrogen atom source. In this novel technique, the atom source produces an atomic nitrogen beam for which multilayer samples with bilayers of the form Fe/FeN or FeTi/FeTiN were synthesized by varying the thickness of the Fe or FeTi exposed to the nitrogen beam. The samples studied here are all in the as-deposited state. X-Ray reflectivity confirms the pre...

  3. Probing Outflows in z= 1~2 Galaxies through FeII/FeII* Multiplets

    CERN Document Server

    Tang, Yuping; Guo, Yicheng; Kurk, Jaron

    2014-01-01

    We report on a study of the 2300-2600\\AA FeII/FeII* multiplets in the rest-UV spectra of star-forming galaxies at 1.01.5 \\AA and of the FeII* emission lines to W_r>0.5 \\AA. Whenever we can measure the systemic redshift of the galaxies from the [OII] emission line, we find that both the FeII and MgII absorption lines are blueshifted, indicative that both species trace gaseous outflows. We also find, however, that the FeII gas has generally lower outflow velocity relative to that of MgII. We investigate the variation of FeII line profiles as a function of the radiative transfer properties of the lines, and find that transitions with higher oscillator strengths are more blueshifted in terms of both line centroids and line wings. We discuss the possibility that FeII lines are suppressed by stellar absorptions. The lower velocities of the FeII lines relative to the MgII doublet, as well as the absence of spatially extended FeII* emission in 2D stacked spectra, suggest that most clouds responsible for the FeII abso...

  4. Strategies of aerobic microbial Fe acquisition from Fe-bearing montmorillonite clay

    Science.gov (United States)

    Kuhn, Keshia M.; DuBois, Jennifer L.; Maurice, Patricia A.

    2013-09-01

    This research investigated strategies used by the common aerobic soil bacterium Pseudomonas mendocina to acquire Fe associated with Fe(III)-bearing montmorillonite (MMT) clay. Given the known importance of Fe(III)-chelating siderophores, Fe-limited batch experiments were conducted using a wild-type (WT) strain that produces siderophores and a ΔpmhA mutant with a siderophore(-) phenotype. Growth measurements were coupled with a transcriptional biosensor assay that monitors the siderophore biosynthesis gene pmhA, measurements of cells' reducing ability, and quantification of exopolymeric substance (EPS) production. WT cells actively grow when MMT is the sole Fe source, but sorption to MMT may decrease the concentration of dissolved Fe-siderophore complex accessible to cells. Cells also obtain Fe by reducing MMT-associated Fe(III), but because P. mendocina lacks a secreted/diffusible reductant, direct physical contact is required. Dual strategies for Fe acquisition—a reducing mechanism that requires contact and that is likely facilitated by biofilm production and a siderophore related mechanism that does not require contact—provide flexibility to address the environmental Fe challenge.

  5. Fe-aminoclay-entrapping electrospun polyacrylonitrile nanofibers (FeAC-PAN NFs) for environmental engineering applications

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jae Young [Korea Railroad Research Institute, Uiwang (Korea, Republic of); Choi, Saehae [Korea Research Institute of Bioscience and Biotechnology, Daejeon (Korea, Republic of); Park, Seung Bin [KAIST, Daejeon (Korea, Republic of); Kim, Mooon Il; Lee, Young Chul [Gachon Univ., Seongnam (Korea, Republic of); Lee, Go Woon [KIER, Daejeon (Korea, Republic of); Lee, Hyun Uk [Korea Basic Science Institute, Daejeon (Korea, Republic of)

    2015-09-15

    Electrospun polyacrylonitrile nanofibers (PAN NFs) with entrapped water-soluble Fe-aminoclay (FeAC) [FeAC-PAN NFs] were prepared. Slow dropwise addition of water-soluble FeAC into a PAN solution, less aggregated of FeAC into electrospun PAN NFs was one-pot evolved without FeAC post-decoration onto as-prepared PAN NFs. Taking into consideration both the Fe{sup 3+} source in FeAC and the improved surface hydrophilicity, the feasibility of Fentonlike reaction for decolorization of cationic model dye methylene blue (MB) under 6 hrs UV-light irradiation was established. In the case where FeAC-PAN NFs were enhanced by hydrogen peroxide (H{sub 2}O{sub 2}) injection, the apparent kinetic reaction rates were increased relative to those for the PAN NFs. Thus, our flexible FeAC-PAN NF mats can be effectively utilized in water/waste treatment and other environmental engineering applications.

  6. Change of Electronic Structure and Magnetic Properties with MgO and Fe Thicknesses in Fe/MgO/Fe Magnetic Tunnel Junction

    Institute of Scientific and Technical Information of China (English)

    YANG Fan; BI Xiao-fang

    2006-01-01

    The effects of the thickness of MgO and Fe on the electronic structure and magnetic properties of Fe/MgO/Fe magnetic tunnel junction was studied using the first principle method. Two series of models with MgO of different thicknesses: Fe(3)MgO(t)Fe(3) (t=1,3,5,7) and with Fe of varied thicknesses: Fe(t)MgO(3)Fe(t) (t=3,4,5,6,7) were established. Calculated results show that in all the models the magnetic moment of Fe increases at the Fe/MgO interface and surface as compared with that of the inner layers. The magnetic moment of each Fe layer was found to be independent of MgO thicknesses, while the spin-polarization of Fe layer at the interface shows a slight change in function of the MgO thicknesses. The tunneling magnetoresistance (TMR) ratio estimated by the Julliere model has the same change tendency as the spin-polarization has, and the largest value is obtained at the MgO thickness of 5 atomic layers. When the Fe thickness increases, the spin-polarization of interface Fe layer follows up an increase with a decrease. The highest TMR value is achieved when the Fe thickness is of 4 atomic layers.

  7. ETNOGRAFIA DOS TERRITÓRIOS JUVENIS NA CIDADE

    Directory of Open Access Journals (Sweden)

    Flávia Maria Silva Rieth

    2012-09-01

    Full Text Available Apresenta-se a etnografia dos espaços de sociabilidade dos jovens nacidade, a qual figura como uma crônica de Pelotas: a Avenida, a Avenida daPraia do Laranjal e o Bar Farol foram os lugares indicados pelos informantes –jovens de 15 a 19 anos de camadas médias. Na Avenida, observa-se o encontrode uma multidão de conhecidos, onde misturam idades e classes sociais,evidenciando as “marcas de pessoalidade” no convite ao olhar o movimento.Distinguem-se os espaços tradicionais daqueles da moda, referências emboracompartilhadas por todos, circunscrevem diferentemente indivíduos e redessociais na cidade. Onde, ganham centralidade os aspectos de geração e gênero,observando-se o pronunciamento do controle sobre os jovens em um contexto decamadas médias do interior.PALAVRAS-CHAVE: Cidade - Juventude - SociabilidadeABSTRACT: The ethnography presents the spaces of intense sociability ofyoung people in the city, which figures as a chronic of Pelotas: the Avenue,Laranjal Beach Avenue and Farol Bar. These places were indicated by theinformers - young people between 15 and 19 years old come from middleclasses. In the Avenue, it notices the meeting with a crowd acquaintances wheremix the ages and the social classes, demonstrating the "personal marks" in theinvitation to take a look at the movement. Traditional spaces distinguish fromfashion spaces. Although everyone shares these references, they constitutedifferently the people and the social network in the city. Therefore, thegeneration and gender aspects become important issues in order to observe thepronounced control of young people in a context of interior middle layers.KEY-WORKS: City - Youth - Sociability.

  8. Dos hipótesis sobre el presidencialismo autoritario

    Directory of Open Access Journals (Sweden)

    Soledad Loaeza

    2013-01-01

    Full Text Available El presidencialismo autoritario mexicano ha sido objeto de muchas reflexiones y opiniones. No obstante, se ha impuesto un paradigma presidencialista que privilegia la perspectiva personalizada e idiosincrática del ejercicio del poder, con un importante componente cultu- ralista. Aquí se propone, por una parte, una perspectiva histórica que contextualiza las accio- nes presidenciales en el período 1944-1970; por la otra, se parte de dos presupuestos generales. Uno, sostiene que los presidentes mexicanos actuaban bajo importantes restricciones y según los ritmos de un proceso que avanzó en episodios, más que en forma lineal o acumulativa; el otro destaca la limitación geopolítica que se deriva de la vecindad con Estados Unidos que incidió sobre las acciones presidenciales, pero también sobre el desarrollo institucional del país. La evolución del presidencialismo autoritario lleva la huella de esta influencia. Este artículo introduce elementos para la discusión de las hipótesis. La primera parte hace una revisión crítica del paradigma presidencialista; la segunda expone las restricciones que se derivaban de la vecindad con Estados Unidos. La tercera y última está dedicada a la descripción del tipo de episodios que Pueden servir para ilustrar la evolución del presidencialismo autoritario. Las dos hipótesis que aquí se presentan han guiado una investigación más amplia sobre el impacto de la Guerra Fría en México y el desarrollo del presidencialismo.

  9. Tratamento atual dos miomas Current treatment of leiomyomas

    Directory of Open Access Journals (Sweden)

    Helena von Eye Corleta

    2007-06-01

    Full Text Available Leiomiomas são tumores benignos. Eles surgem no miométrio e contêm quantidade variável de tecido conjuntivo fibroso. Cerca de 75% dos casos são assintomáticos, encontrados ocasionalmente durante exame abdominal, pélvico bimanual ou ultra-sonografia. Os sintomas são relacionados diretamente ao tamanho, ao número e à localização dos miomas. Nessa revisão, são apresentadas as abordagens terapêuticas atuais clínicas (anticoncepcionais orais, progestágenos e antiprogestágenos, análogos do hormônio liberador das gonadotrofinas (GnRH, e antiinflamatórios não esteróides e cirúrgicas (histerectomia, miomectomia e embolização para o tratamento de leiomiomas.Leiomyomas are benign tumors. They appear in the myometrium and present a variable amount of fibrous conjunctive tissue. About 75% of the cases are not symptomatic and are usually found during abdominal, bimanual pelvic examination or during ultrasonography. The symptoms are directly related to the size, number and localization of the myomas. In the present review, the current clinical therapeutic procedures (oral anti-conceptive drugs, progestins and anti-progestins, analogues of the gonadothrophins’ releasing hormone (GnRH, and non-steroid anti-inflammatory drugs, and also the surgical procedures (hysterectomy, myomectomy, embolization are presented for the treatment of leiomyomas.

  10. Dos obras de Craig Ellwood – (EE. UU.

    Directory of Open Access Journals (Sweden)

    Tyler, James

    1972-10-01

    Full Text Available The Irvine complex is intended to serve a fast-growing community in California. It is situated in the proximity of the Orange Country Airport, and acts as an access nucleus to the industrial zone. It consists of four symmetrical blocks; the two single-storey buildings are banks; while the two four-storey buildings are for offices. The structure is of Corten steel, with curtain walls, and the interior makes use of all the comforts that modern techniques allow. Week-end house The single-family dwelling at San Luis Obispo is a weekend house of great simplicity in both structure and shape, suspended over a small valley. It was built by students of the Politecnic College of California as part of their practical work, and they took an active part in its construction.El complejo Irvine está destinado a servir, en arrendamiento, a una comunidad californiana de gran crecimiento. Se halla situado en las proximidades del Aeropuerto del condado de Orange y sirve como núcleo de acceso a la zona industrial. Se compone de cuatro bloques simétricos, destinados: los dos de una planta a bancos, y los dos de cuatro plantas a oficinas. La estructura lleva acero Corten y los cerramientos han sido realizados a base de muros cortina, disponiendo en su interior de todas las comodidades que proporciona la técnica actual. La vivienda unifamiliar en San Luis Obispo es un pabellón fin de semana de gran sencillez estructural y formal, suspendida sobre un pequeño valle. La casa ha sido desarrollada como parte de su trabajo, por los estudiantes del Colegio Politécnico de California, colaborando activa y físicamente en su construcción.

  11. Fe Protein-Independent Substrate Reduction by Nitrogenase MoFe Protein Variants

    Energy Technology Data Exchange (ETDEWEB)

    Danyal, Karamatullah; Rasmussen, Andrew J.; Keable, Stephen M.; Inglet, Boyd S.; Shaw, Sudipta; Zadvornyy, Oleg; Duval, Simon S.; Dean, Dennis R.; Raugei, Simone; Peters, John W.; Seefeldt, Lance C.

    2015-04-21

    The reduction of substrates catalyzed by nitrogenase normally requires nucleotide-dependent Fe protein delivery of electrons to the MoFe protein, which contains the active site FeMo-cofactor. Here, it is reported that independent substitution of three amino acids (ß-98Tyr→His, α-64Tyr→His, and ß-99Phe→His) located between the P cluster and FeMo-cofactor within the MoFe protein endows it with the ability to reduce protons to H2, azide to ammonia, and hydrazine to ammonia without the need for Fe protein or ATP. Instead, electrons can be provided by the low potential reductant polyaminocarboxylate ligated Eu(II) (Em -1.1 to -0.84 V vs NHE). The crystal structure of the ß-98Tyr→His variant MoFe protein was determined, revealing only small changes near the amino acid substitution that affect the solvent structure and immediate vicinity between the P cluster and the FeMo-cofactor, with no global conformational changes observed. Computational normal mode analysis on the nitrogenase complex reveal coupling in the motions of the Fe protein and the region of the MoFe protein with these three amino acids, which suggests a possible mechanism for how Fe protein might communicate deep within the MoFe protein subtle changes that profoundly affect intramolecular electron transfer and substrate reduction. This work was supported by a grant from the National Science Foundation (MCB-1330807) to JWP and LCS. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (DE-SC0010687 and DE-SC0010834 to LCS and DRD) and the Division of Chemical Sciences, Geosciences, and Bio-Sciences (SR). The coordinates for the ß-98His MoFe protein were deposited with the Protein Data Bank (PDB 4XPI).

  12. Electrodeposited NiCoFe films from electrolytes with different Fe ion concentrations

    Energy Technology Data Exchange (ETDEWEB)

    Kockar, Hakan, E-mail: hkockar@balikesir.edu.tr [Balikesir Universitesi, Fen Edebiyat Fakultesi, Fizik Bolumu, Cagıs Yerleskesi, 10145 Balikesir (Turkey); Demirbas, Ozen, E-mail: ozendemirbas@hotmail.com [Balikesir Universitesi, Fen Edebiyat Fakultesi, Fizik Bolumu, Cagıs Yerleskesi, 10145 Balikesir (Turkey); Kuru, Hilal, E-mail: htopcu@balikesir.edu.tr [Balikesir Universitesi, Fen Edebiyat Fakultesi, Fizik Bolumu, Cagıs Yerleskesi, 10145 Balikesir (Turkey); Alper, Mursel, E-mail: malper@uludag.edu.tr [Uludag Universitesi, Fen Edebiyat Fakultesi, Fizik Bolumu, 16059 Gorukle, Bursa (Turkey); Karaagac, Oznur, E-mail: karaagac@balikesir.edu.tr [Balikesir Universitesi, Fen Edebiyat Fakultesi, Fizik Bolumu, Cagıs Yerleskesi, 10145 Balikesir (Turkey); Haciismailoglu, Murside, E-mail: msafak@uludag.edu.tr [Uludag Universitesi, Fen Edebiyat Fakultesi, Fizik Bolumu, 16059 Gorukle, Bursa (Turkey); Ozergin, Ercument, E-mail: ercumentz@yahoo.com [Balikesir Universitesi, Fen Edebiyat Fakultesi, Fizik Bolumu, Cagıs Yerleskesi, 10145 Balikesir (Turkey)

    2014-06-01

    Ternary NiCoFe films, relating their magnetic and magnetoresistance properties with film composition, and the corresponding crystal structure were investigated in terms of different Fe ion concentrations in the electrolyte. The current–time transients were recorded to control the growth of proper films. The film composition by energy dispersive X-ray spectroscopy revealed that as the Fe ion concentration in the electrolyte was increased, the Fe and Co contents in the films increased and Ni content decreased. From the structural analysis by X-ray diffraction, all films had a face-centred cubic structure and, no reflection from body-centred cubic (bcc) Fe was existed in all samples due to <12 at% Fe. The saturation magnetisation increased from 865 emu/cm{sup 3} to 1080 emu/cm{sup 3} and the coercivities decreased from 60 Oe to 13 Oe with increasing Fe and Co contents and decreasing Ni content in the films. All NiCoFe films showed anisotropic magnetoresistance. The longitudinal magnetoresistance magnitudes decreased from 6.3% to 2.2% with increasing Fe and Co contents and decreasing Ni in the films while the magnitudes of transverse magnetoresistance stayed almost constant at ∼5.0%. The variations in magnetic and magnetoresistive properties related to the crystal structure were attributed to the compositional changes caused by the variation of the Fe ion concentration in the electrolyte. - Highlights: • Structural and magnetic properties of electrodeposited NiCoFe films were studied. • The Fe and Co increased and Ni decreased with increasing Fe concentration. • All films had a face-centred cubic structure irrespective of the film content. • The M{sub s} increased and H{sub c} decreased with the change of film content. • All films showed AMR.

  13. Pr2Fe14B/α-Fe nanocomposites for thermal applications

    International Nuclear Information System (INIS)

    In this work, PrxFe94-xB6 (x = 6, 8, 10 and 12) nanostructured powders were prepared by a combination of hydrogenation, disproportionation, desorption and recombination (HDDR) process with high energy milling applied to the mixture of an as-cast alloy (Pr14Fe80B6) and α-Fe. The produced nanoparticles showed magnetic properties comparable to those reported in hyperthermia studies. The optimal time to obtain the magnetic nanoparticles is 5 hours (at 900 rpm). It was verified that longer milling times cause an increase in carbon percentage on the particles. The carbon is derived from oleic acid added as a surfactant in the milling step. The nanocomposites exhibit coercive force ranging from 80 Oe (6.5 kAm-1) to 170 Oe (13.5 kAm-1) and magnetic moments in the range of 81 129 Am2kg-1. From the X-ray diffraction analyses, only two phases were found in all samples: α-Fe and the magnetic phase Pr2Fe14B. Individual nanoparticles with diameter of about 20 nm were verified. The samples studied presented heating when exposed to an alternating magnetic field (f = 222 kHz e Hmax ∼3.7 kAm-1) comparable to reported in literature. Temperature variations (ΔT) of the powders were: 51 K for Pr6Fe88B6, 41 K for Pr8Fe86B6, 38 K for Pr10Fe84B6 and T = 34 K for Pr12Fe82B6. The specific absorption rates (SARs) of the powders were 201 Wkg-1 for Pr6Fe88B6 composition, 158 Wkg-1 on the composition Pr8Fe86B6, and 114 Wkg-1 for Pr10Fe84B6 and Pr12Fe82B6 compositions. (author)

  14. Uma análise dos sites de governos eletrônicos no Brasil sob a ótica dos usuários dos serviços e sua satisfação

    Directory of Open Access Journals (Sweden)

    Ieda Pelógia Martins Damian

    2013-08-01

    Full Text Available Os sites de governo eletrônico (e-gov têm sido muito analisados do ponto de vista dos aspectos técnicos, existindo poucos estudos que os avaliem do ponto de vista dos usuários dos serviços oferecidos por estes sites. Este estudo propôs um modelo de análise dos serviços de sites de e-gov avaliados com a técnica de análise de conteúdo e identificados os níveis de atendimento dos atributos do modelo. As principais contribuições do estudo são: uma crítica das deficiências verificadas nos principais sites analisados e uma proposição de um modelo abrangente que facilite a orientação para o atendimento das principais dimensões a serem analisadas, quais sejam: eficiência, realização, disponibilidade do sistema, privacidade, site e sinergia. Do ponto de vista gerencial, o estudo contribuiu com um modelo de fácil aplicação que pode auxiliar a identificar os aspectos mais importantes dos serviços de e-gov.

  15. Exchange interactions in Fe/Y multilayers

    International Nuclear Information System (INIS)

    The magnetization of Fe/Y multilayers has been measured as a function of temperature. A bulk-like T 3/2 temperature dependence of the magnetization is observed for all multilayers in the temperature range 5-300 K. The spin-wave constant B is found to decrease inversely with t Fe. A simple theoretical model with exchange interactions only, and with non-interacting magnons, has been used to explain the temperature dependence of the magnetization and the approximate values for the bulk exchange interaction J b, surface exchange interaction J s and the interlayer exchange interaction J I for various Fe layer thicknesses have been obtained

  16. Produtividade do cacaueiro em função de características do solo: II. características físico-morfológicas e alguns elementos extraídos pelo ataque sulfúrico

    Directory of Open Access Journals (Sweden)

    J. O. Souza Jr.

    1999-12-01

    Full Text Available Com base na produtividade em sete anos (1989 a 1995 de 36 talhões produtivos de cacau, cultivados numa propriedade agrícola no sul da Bahia, foram obtidas as médias dos três anos mais e menos produtivos, correspondendo, respectivamente, a anos de maior e menor quantidade de chuvas. Essas produtividades foram relacionadas, por análise de trilha, com as características físico-morfológicas do solo (profundidade do horizonte A; cor, porosidade, densidades aparente e de partícula dos horizontes A e B; textura das camadas de 0-20 e 30-50 cm e presença de cascalho ou pedras até à profundidade de 50 cm e com os teores totais de elementos (Ti, K, Cu, Fe, Mn e Zn, obtidos pelo ataque sulfúrico, na camada de 30-50 cm de profundidade. Os micronutrientes extraídos pelo ataque sulfúrico foram correlacionados com aqueles extraídos pelo Mehlich-1. Em geral, as características físicas explicaram melhor a produtividade dos anos mais secos, enquanto os teores de elementos extraídos pelo ataque sulfúrico correlacionaram-se melhor com a produtividade dos anos mais chuvosos. Os talhões mais produtivos tinham horizonte A mais profundo, solo mais poroso, com maiores teores de micronutrientes catiônicos e Ti e menor teor de K obtido pelo ataque sulfúrico. Em anos mais secos, os talhões mais produtivos foram aqueles que apresentavam solo com maior teor de argila e menores teores de silte e areia. A presença de cascalho até à profundidade de 50 cm e a cor dos horizontes do solo não se correlacionaram significativamente com a produtividade das plantas. Cobre, Mn e, ou, Zn, extraídos pelo ataque sulfúrico, indicaram solos de maior fertilidade natural em micronutrientes catiônicos para o cacaueiro.

  17. Avaliação econômica dos casos de Dengue atribuídos ao desastre de 2011 em Nova Friburgo (RJ), Brasil

    OpenAIRE

    Carlos Alexandre Rodrigues Pereira; Martha Macedo de Lima Barata; Melania de Paulo Cariello Hoelz; Viviane Nunes Lopes Oliveira Medeiros; Felipe de Carvalho Vommaro Marincola; Cristina Costa Neto; Diana Pinheiro Marinho; Teresa Vieira dos Santos Oliveira; Aline Guimarães Monteiro Trigo; Thiago Klein de Medeiros

    2014-01-01

    A perspectiva apontada pelos cenários climáticos desenvolvidos para o Brasil é de provável aumento no número de eventos hidrometeorológicos extremos nos próximos anos. Por isso, se faz importante o estudo dos agravos em saúde que poderão se intensificar em decorrência desses eventos. Portanto, por meio deste artigo, propõe-se estimar o custo representado pelos casos de dengue atribuídos ao desastre de 2011, em Nova Friburgo (RJ). Verificou-se que ocorreram 1.356 casos suspeitos de dengue, dos...

  18. DETERMINANTES DOS RENDIMENTOS DE CATADORES DE MATERIAIS RECICLÁVEIS NO BRASIL: UMA ABORDAGEM A PARTIR DOS MICRODADOS DA AMOSTRA DO CENSO IBGE 2010

    OpenAIRE

    Ivani Jose Santos

    2013-01-01

    Neste artigo são analisados alguns dos elementos determinantes dos rendimentos de catadores de materiais recicláveis no Brasil, utilizando-se dados da Amostra do Censo IBGE 2010. Diferentes modelos descritivos foram criados a partir de características pessoais e regionais dos trabalhadores da reciclagem. Foram observadas diferenças endógenas e exógenas significativas nos segmentos de trabalhadores com carteira assinada, sem carteira assinada e conta própria. Em média, em comparação com os tr...

  19. Preparation and characterization of epitaxial thin films and patterned nanostructures of Ni/Cu and Fe/Cu

    OpenAIRE

    Corredor, Edna C.

    2012-01-01

    El objetivo del trabajo realizado en esta tesis titulada: Preparation and magnetic characterization of epitaxial thin films and patterned nanostructures of Ni/Cu and Fe/Cu es establecer relaciones entre las propiedades magnéticas de sistemas nanoestructurados y sus dimensiones físicas o factores estructurales que aparecen al reducirse la dimensión espacial a dos, en el caso de películas delgadas, y a una en el caso de elementos patronados. Los sistemas objeto de estudio se caracterizan por se...

  20. Preparation and characterization of epitaxial thin films and patterned nanostructures of Ni/Cu and Fe/Cu

    OpenAIRE

    Corredor Vega, Edna Consuelo; Ciria Remacha, Miguel Ángel; Arnaudas Pontaque, José Ignacio

    2013-01-01

    El objetivo del trabajo realizado en esta tesis titulada: Preparation and magnetic characterization of epitaxial thin films and patterned nanostructures of Ni/Cu and Fe/Cu es establecer relaciones entre las propiedades magnéticas de sistemas nanoestructurados y sus dimensiones físicas o factores estructurales que aparecen al reducirse la dimensión espacial a dos, en el caso de películas delgadas, y a una en el caso de elementos patronados. Los sistemas objeto de estudio se caracterizan por se...

  1. ESPERA, ESPERANZA, FE Y TURISMO

    Directory of Open Access Journals (Sweden)

    Anna María Fernández Poncela

    2013-06-01

    Full Text Available El texto revisa los conceptos y sentimientos relacionados con la espera y la esperanza. El estudio se centra en espacios de turismo religioso. Espacios donde el tiempo parece detenido y los devotos depositan su fe y los turistas visitan también. En concreto en Zapopan, municipio junto a la ciudad de Guadalajara, Jalisco, México. En una época donde el turismo busca lo auténtico, la experiencia y las emociones, el turismo religioso aumenta y algunos lugares son más populares que nunca.This text reviews the some concepts and feelings related to the wait and hope. The study focuses on spaces of religious tourism. Spaces where the time seems stopped and devotees deposited their faith and tourists also visit this spaces too. In particular in Zapopan, a municipality near the city of Guadalajara, Jalisco, Mexico. Today tourism looking for authentic, experience and emotions, religious tourism increases and some places are more popular than ever.

  2. Contributos da nanotecnologia para a sustentabilidade dos materiais de construção

    OpenAIRE

    Oliveira, Hugo J. R.

    2012-01-01

    Os avanços nanotecnológicos atingem inúmeras áreas da ciência, mas no âmbito da sustentabilidade dos materiais de construção os progressos embora importantes são escassos e acima de tudo objeto de reduzida divulgação. O presente artigo sintetiza uma avaliação do estado da arte relativa a alguns dos contributos da nanotecnologia para a sustentabilidade dos materiais de construção. No mesmo, se aborda a compreensão dos compostos gerados durante a hidratação do cimento Portland, o...

  3. Electrochemical Oxidation of BaFeO2.5 to BaFeO3

    International Nuclear Information System (INIS)

    Defect perovskite-type BaFeO2.5 was oxidized to BaFeO3 by an electrochemical method in an alkaline aqueous electrolyte at 25 °C. With increase in the charge transfer q (electrons/formula unit), BaFeOz showed monoclinic (at nearly q = 0), rhombohedral (at around q = 0.34), pseudo-cubic (at 0.78 ≤ q ≤ 0.89), and true cubic (at q ≥ 0.89) structures. While an oxygen evolution reaction (OER) started at ca. q = 0.80, the oxidation of BaFeOz could concurrently be continued with the OER and BaFeO3 was obtained at q = 1.2. Further, the chemical potential of oxygen in BaFeOz could be estimated in the range of 2.5 ≤ z ≤ 2.87 without OER

  4. Fe and N diffusion in nitrogen-rich FeN measured using neutron reflectometry

    Indian Academy of Sciences (India)

    Mukul Gupta; A Gupta; A Wildes; T Gutberlet

    2008-11-01

    Grazing incidence neutron reflectometry provides an opportunity to measure the depth profile of a thin film sample with a resolution <1 nm, in a non-destructive way. In this way the diffusion across the interfaces can also be measured. In addition, neutrons have contrast among the isotopes, making it feasible to measure the self-diffusion. In the present work, the isotope multilayers of [FeN/57 FeN]10 and [FeN/Fe15N]10 were prepared using magnetron sputtering and self-diffusion of Fe and N was investigated. It was found that N diffusion is slower compared to Fe and does not follow the atomic size dependence.

  5. Effect of Fe coating of nucleation sites on epitaxial growth of Fe oxide nanocrystals on Si substrates

    Science.gov (United States)

    Ishibe, Takafumi; Watanabe, Kentaro; Nakamura, Yoshiaki

    2016-08-01

    We studied the effect of Fe coating on the epitaxial growth of Fe3O4 nanocrystals (NCs) over Fe-coated Ge epitaxial nuclei on Si(111). To completely cover Ge nuclei with Fe, some amount of Fe (>8 monolayers) must be deposited. Such covering is a key to epitaxial growth because an Fe coating layer prevents the oxidation of Ge surfaces during Fe3O4 formation, resulting in the epitaxial growth of Fe3O4 on them. This study demonstrates that an appropriate Fe coating of nucleation sites leads to the epitaxial growth of Fe3O4 NCs on Si substrates, indicating the realization of environmentally friendly and low-cost Fe3O4 NCs as the resistance random access memory material.

  6. Effect of Fe2P in LiFePO4/Fe2P composite on electrochemical properties synthesized by MA and control of heat condition

    Institute of Scientific and Technical Information of China (English)

    PARK Jong Suk; LEE Kyung Tae; LEE Kyung Sub

    2006-01-01

    In order to control the size and distribution of the high conductive Fe2P in LiFePO4/Fe2P composite, two different cooling rates (Fast: 15 ℃·min-1, Slow: 2 ℃·min-1) were employed after mechanical alloying.The discharge capacity of the fast cooled was 83 mAh·g-1 and the slow cooled 121 mAh·g-1.The particle size of the synthesized powder was examined by transmission electron microscopy and distribution of Fe2P was characterized using scanning electron microscopy (SEM).In addition, two-step heat treatment was carried out for better distribution of Fe2P.X-ray diffraction (XRD) and Rietveld refinement reveal that LiFePO4/Fe2P composite consists of 95.77% LiFePO4 and 4.33% of Fe2P.

  7. Evaluación de protocolos de sedación y analgesia con xilazina y dos tasas de infusión continua de morfina en caballos en estación sometidos a castración vía laparascópica

    Directory of Open Access Journals (Sweden)

    JD Ruiz

    2015-01-01

    Full Text Available El objetivo de este estudio fue evaluar la utilización de infusión continua de morfina a dos dosis distintas en cuanto a los niveles de sedación y analgesia en castración laparoscópica en caballos. Se utilizaron 14 caballos criollos colombianos, entre tres y seis años, y peso de 239 a 369 kg clínicamente sanos. A los animales se les administró xilazina (0,6 mg/kg IV, morfina (0,05 mg/kg IV y se asignaron al azar a una infusión continua de morfina (20 o 30 mcg/kg/hora I.V para posteriormente realizar transección de arteria y vena testicular mediante laparoscopia en estación por el flanco. Se evaluaron el grado de ataxia, sedación y analgesia, así como la motilidad gastrointestinal por auscultación y ecografía. Durante los procedimientos anestésicos y quirúrgicos los animales de ambos protocolos presentaron buena estabilidad cardiaca y respiratoria y todos los pacientes tuvieron una sedación de leve a moderada. La ataxia se presentó como moderada al inicio de la cirugía y durante procedimiento anestésico (luego del bolo de xilazina y al final de la cirugía los animales presentaron un grado de ataxia leve a moderado. Alrededor del 93% de los animales tuvieron grados de analgesia de leves a moderadas a los estímulos quirúrgicos dolorosos principalmente el abordaje quirúrgico por el flanco y la ligadura y corte del paquete neurovascular testicular. La motilidad intestinal se disminuyó durante el procedimiento anestésico, pero todos los animales recuperaron totalmente la motilidad intestinal a las seis horas postcirugía. Los procedimientos anestésicos y quirúrgicos fueron apropiados para cirugía abdominal por laparoscopia en equino, con buena estabilidad cardiovascular y respiratoria y sin complicaciones gastrointestinales posteriores a la intervención.

  8. Nanophase Fe0 in lunar soils

    Indian Academy of Sciences (India)

    Abhijit Basu

    2005-06-01

    Back scattered electron and transmission electron imaging of lunar soil grains reveal an abundance of submicrometer-sized pure Fe00 globules that occur in the rinds of many soil grains and in the submillimeter sized vesicular glass-cemented grains called agglutinates. Grain rinds are amorphous silicates that were deposited on grains exposed at the lunar surface from transient vapors produced by hypervelocity micrometeorite impacts. Fe0 may have dissociated from Fe-compounds in a high temperature (< 3000°C) vapor phase and then condensed as globules on grain surfaces. The agglutinitic glass is a quenched product of silicate melts, also produced by micrometeorite impacts on lunar soils. Reduction by solar wind hydrogen in agglutinitic melts may have produced immiscible droplets that solidified as globules. The exact mechanism of formation of such Fe0 globules in lunar soils remains unresolved.

  9. Summary of Fe opacity measurement platform

    Energy Technology Data Exchange (ETDEWEB)

    Nagayama, Taisuke

    2016-05-01

    This powerpoint presentation goes over the Fe opacity measurement platform, including how the experiment works, what can be gathered from the measurements, what can be gathered from the simulations, and the limitations of the experiment.

  10. Modeling thermodynamics of Fe-N phases; characterisation of e-Fe2N1-z

    DEFF Research Database (Denmark)

    Pekelharing, M.I.; Böttger, A.; Somers, Marcel A.J.;

    1999-01-01

    In order to arrive at modeling the thermodynamics of Fe-N phases, including long-range (LRO) and short-range ordering (SRO) of the N atoms, it is important to understand the role of N interstitially dissolved in an Fe-host lattice. The crystal structure of -Fe2N1-z consists of an h.c.p. iron sub...

  11. Hard magnetic materials Nd-Fe-B/Fe with epoxy resin matrix

    OpenAIRE

    M. Drak; L.A. Dobrzański

    2007-01-01

    Purpose: The purpose of the paper is to present the technological solution of obtaining hard magnetic composite materials based on Nd-Fe-B with addition of iron powder and bounded by epoxy resin.Design/methodology/approach: Composite materials reinforced by Nd-Fe-B particles or Nd-Fe-B with addition of iron powder with polymer matrix were manufactured by one-sided uniaxal pressing. The complex relationships among the manufacturing technology of these materials, their microstruc...

  12. High Temperature Magnetic Properties of Indirect Exchange Spring FePt/M(Cu,C/Fe Trilayer Thin Films

    Directory of Open Access Journals (Sweden)

    Anabil Gayen

    2013-01-01

    Full Text Available We report the investigation of temperature dependent magnetic properties of FePt and FePt(30/M(Cu,C/Fe(5 trilayer thin films prepared by using magnetron sputtering technique at ambient temperature and postannealed at different temperatures. L10 ordering, hard magnetic properties, and thermal stability of FePt films are improved with increasing postannealing temperature. In FePt/M/Fe trilayer, the formation of interlayer exchange coupling between magnetic layers depends on interlayer materials and interface morphology. In FePt/C/Fe trilayer, when the C interlayer thickness was about 0.5 nm, a strong interlayer exchange coupling between hard and soft layers was achieved, and saturation magnetization was enhanced considerably after using interlayer exchange coupling with Fe. In addition, incoherent magnetization reversal process observed in FePt/Fe films changes into coherent switching process in FePt/C/Fe films giving rise to a single hysteresis loop. High temperature magnetic studies up to 573 K reveal that the effective reduction in the coercivity decreases largely from 34 Oe/K for FePt/Fe film to 13 Oe/K for FePt/C(0.5/Fe film demonstrating that the interlayer exchange coupling seems to be a promising approach to improve the stability of hard magnetic properties at high temperatures, which is suitable for high-performance magnets and thermally assisted magnetic recording media.

  13. ELECTRON-ION RECOMBINATION OF Fe X FORMING Fe IX AND OF Fe XI FORMING Fe X: LABORATORY MEASUREMENTS AND THEORETICAL CALCULATIONS

    International Nuclear Information System (INIS)

    We have measured electron-ion recombination for Fe9+ forming Fe8+ and for Fe10+ forming Fe9+ using a merged beams arrangement at the TSR heavy-ion storage ring in Heidelberg, Germany. The measured merged beams recombination rate coefficients (MBRRC) for relative energies from 0 to 75 eV are presented, covering all dielectronic recombination (DR) resonances associated with 3s → 3p and 3p → 3d core transitions in the spectroscopic species Fe X and Fe XI, respectively. We compare our experimental results to state-of-the-art multiconfiguration Breit-Pauli (MCBP) calculations and find significant differences. Poor agreement between the measured and theoretical resonance structure is seen for collision energies below 48 eV for Fe X and below 35 eV for Fe XI. The integrated resonance strengths, though, are in reasonable agreement. At higher energies, good agreement is seen for the resonance structure but for the resonance strengths theory is significantly larger than experiment by a factor of ∼ 1.5 (2) for Fe X (Fe XI). From the measured MBRRC, we have extracted the DR contributions and transform them into plasma recombination rate coefficients (PRRCs) for astrophysical plasmas with temperatures in the range of 102-107 K. This range spans across the regimes where each ion forms in photoionized or in collisionally ionized plasmas. For both temperature regimes, the experimental uncertainties are 25% at a 90% confidence level. As expected based on predictions from active galactic nucleus observations as well as our previous laboratory and theoretical work on M-shell iron, the formerly recommended DR data severely underestimated the rate coefficient at temperatures relevant for photoionized gas. At these temperatures relevant for photoionized gas, we find agreement between our experimental results and MCBP theory. This is somewhat surprising given the poor agreement in MBRRC resonance structure. At the higher temperatures relevant for collisionally ionized gas, the MCBP

  14. Electron-Ion Recombination of Fe X Forming Fe IX and of Fe XI Forming Fe X: Laboratory Measurements and Theoretical Calculations

    Science.gov (United States)

    Lestinsky, M.; Badnell, N. R.; Bernhardt, D.; Grieser, M.; Hoffmann, J.; Lukić, D.; Müller, A.; Orlov, D. A.; Repnow, R.; Savin, D. W.; Schmidt, E. W.; Schnell, M.; Schippers, S.; Wolf, A.; Yu, D.

    2009-06-01

    We have measured electron-ion recombination for Fe9+ forming Fe8+ and for Fe10+ forming Fe9+ using a merged beams arrangement at the TSR heavy-ion storage ring in Heidelberg, Germany. The measured merged beams recombination rate coefficients (MBRRC) for relative energies from 0 to 75 eV are presented, covering all dielectronic recombination (DR) resonances associated with 3s → 3p and 3p → 3d core transitions in the spectroscopic species Fe X and Fe XI, respectively. We compare our experimental results to state-of-the-art multiconfiguration Breit-Pauli (MCBP) calculations and find significant differences. Poor agreement between the measured and theoretical resonance structure is seen for collision energies below 48 eV for Fe X and below 35 eV for Fe XI. The integrated resonance strengths, though, are in reasonable agreement. At higher energies, good agreement is seen for the resonance structure but for the resonance strengths theory is significantly larger than experiment by a factor of ≈ 1.5 (2) for Fe X (Fe XI). From the measured MBRRC, we have extracted the DR contributions and transform them into plasma recombination rate coefficients (PRRCs) for astrophysical plasmas with temperatures in the range of 102-107 K. This range spans across the regimes where each ion forms in photoionized or in collisionally ionized plasmas. For both temperature regimes, the experimental uncertainties are 25% at a 90% confidence level. As expected based on predictions from active galactic nucleus observations as well as our previous laboratory and theoretical work on M-shell iron, the formerly recommended DR data severely underestimated the rate coefficient at temperatures relevant for photoionized gas. At these temperatures relevant for photoionized gas, we find agreement between our experimental results and MCBP theory. This is somewhat surprising given the poor agreement in MBRRC resonance structure. At the higher temperatures relevant for collisionally ionized gas, the MCBP

  15. MAGNETIC ANOMALY IN SUPERCONDUCTING FeSe

    OpenAIRE

    Mendoza, D.; Benitez, J. L.; Morales, F.; Escudero, R.

    2010-01-01

    Synthesis, electrical and magnetic characterization of superconducting FeSe0.85 compound is reported. An anomaly in the magnetization against temperature around 90K is observed. Magnetic characterization of a commercial compound with nominal FeSe stoichiometry is also presented. The overall magnetic behaviors as well as the magnetic anomaly in both compounds are discussed in terms of magnetic impurities and secondary phases. Keyword: A. Superconductors

  16. Magnetic properties of FeSe superconductor

    OpenAIRE

    Grechnev, G. E.; Panfilov, A.S.; Desnenko, V. A.; Fedorchenko, A. V.; Gnatchenko, S. L.; Chareev, D. A.; Volkova, O. S.; A.N. Vasiliev

    2012-01-01

    A detailed magnetization study for the novel FeSe superconductor is carried out to investigate the behavior of the intrinsic magnetic susceptibility $\\chi$ in the normal state with temperature and under hydrostatic pressure. The temperature dependencies of $\\chi$ and its anisotropy $\\Delta \\chi=\\chi_{|}-\\chi_{\\bot}$ are measured for FeSe single crystals in the temperature range 4.2-300 K, and a substantial growth of susceptibility with temperature is revealed. The observed anisotropy $\\Delta ...

  17. Magnetic Phase Transition in FeRh

    OpenAIRE

    Gu, R. Y.; Antropov, V.P.

    2005-01-01

    Density functional calculations are performed to investigate the phase transition in FeRh alloy. The effective exchange coupling, the critical temperature of magnetic phase transition and the adiabatic spin wave spectrum have been obtained. Different contributions to the free energy of different phases are estimated. It has been found that the antiferro-ferromagnetic transition in FeRh occurs mostly due to the spin wave excitations.

  18. Microwave Magnetic Permeability of Fe304 Nanoparticles

    Institute of Scientific and Technical Information of China (English)

    ZHENG Hong; YANG Yong; WEN Fu-Sheng; YI Hai-Bo; ZHOU Dong; LI Fa-Shen

    2009-01-01

    Well-dispersed Fe304 nanoparticles are synthesized via an oxidization method with NANO2 as oxidant. The microwave magnetic properties of the composites are studied with different volume fractions of Fe3O4 nanoparti-cles. It is found that a lower volume fraction corresponds to a higher magnetic resonance frequency. This could be ascribed to the enhancement of exchange interaction with a weakened dipolar interaction when the volume fraction decreases.

  19. Moessbauer spectroscopy of Fe-based nanomaterials

    International Nuclear Information System (INIS)

    There are two opinions concerning the effect of the nanosized grains on magnetic properties and Moessbauer spectra. One of them testifies that nanomaterials have a grain boundary phase (interface region) which decreases the specific saturation magnetization and leads to the additional sextet in the Moessbauer spectrum. The second one treats the changes in spectra by the impurities. In this work the results on a-Fe, Fe90Ge10 and Fe77,5Al22.5 nanocrystalline alloys are presented. The nanostructured (8 nm) powders of Fe, bcc disordered Fe90Ge10 and Fe77,5Al22.5 were produced by mechanical grinding and alloying. The samples were studied by X-ray diffraction, Moessbauer spectroscopy, magnetic measurements and then compared with microstructured ones. With the absence of contamination no changes have been found in the specific saturation magnetization, Curie temperature and hyperfine interaction parameters of the nanomaterials. No additional sextet in the Moessbauer spectra and peculiarities in the temperature dependences of a.c. magnetic susceptibility were found either. We have registered a slight lines broadening (∼ 20%) in Moessbauer spectrum of the nanocrystalline pure Fe. The broadening observed is explained by random in sign and in magnitude anisotropic contribution to the hyperfine magnetic field from the Fe atoms in the interfaces. The conclusion drawn is that the interface of the nanostructure (boundary and close-to-boundary distorted zones) of 1 nm width considerably have the same magnetic properties and hyperfine interaction parameters in comparison with those in the bulk.

  20. Moessbauer study of nanocrystalline PrFeB and PrFeCrB alloys

    Energy Technology Data Exchange (ETDEWEB)

    Barra-Barrera, A.D.; Murakami, R.K.; Partiti, C.S.M.; Villas-Boas, V. E-mail: val@macbeth.if.usp.br

    2001-05-01

    Ribbons of Pr{sub 4.5}Fe{sub 77}B{sub 18.5} and Pr{sub 5}Fe{sub 74}Cr{sub 3}B{sub 18} alloys were produced by melt spinning and then annealed by flash or conventional annealing to develop enhanced-remanence nanocrystalline magnetic material. These materials were studied by magnetic measurements, X-ray diffraction and Moessbauer spectroscopy in order to understand the relationship between structural and magnetic properties. These analyses showed that the phases present in these materials are Pr{sub 2}Fe{sub 14}B, Fe{sub 3}B and {alpha}-Fe. The samples with Cr present a coercive field 50% higher than the Cr-free samples. The Moessbauer spectra were analyzed as a superposition of the well-known spectra of Pr{sub 2}Fe{sub 14}B, Fe{sub 3}B and {alpha}-Fe. The mean hyperfine magnetic field of each phase was obtained from the spectral analysis, as well as, the relative amount of each phase present. From Moessbauer results it seems that Cr atoms preferentially dissolves in the Fe{sub 3}B phase.

  1. Exchange coupled L10-FePt/fcc-FePt nanomagnets: Synthesis, characterization and magnetic properties

    Science.gov (United States)

    Srivastava, Sachchidanand; Gajbhiye, Namdeo S.

    2016-03-01

    We report synthesis, characterization and magnetic properties of exchange-coupled L10-FePt/fcc-FePt nanomagnets. Structural and morphological characterization of exchange-coupled L10-FePt/fcc-FePt was carried out by powder X-ray diffraction, Mössbauer spectroscopy and transmission electron microscopy. Rietveld refinement of powder X-ray diffraction pattern has been used to quantify L10-FePt and fcc-FePt phases present in samples. Room temperature Mössbauer spectroscopy showed sextets of both L10-FePt and fcc-FePt phases with their respective hyperfine interaction parameters. Transmission electron microscopic (TEM and HRTEM) images confirmed nanocrystalline nature of exchange-coupled nanomagnets with particle size ranges from 15 nm to 50 nm after annealing for different time at 700 °C. Room temperature magnetic studies showed ferromagnetic nature of nanomagnets and maximum energy product (BH)max~10.92 MGOe was obtained for sample containing 89.0% volume fraction of L10-FePt phase.

  2. Fe-Si networks in Na2FeSiO4 cathode materials.

    Science.gov (United States)

    Wu, P; Wu, S Q; Lv, X; Zhao, X; Ye, Z; Lin, Z; Wang, C Z; Ho, K M

    2016-08-24

    Using a combination of adaptive genetic algorithm search, motif-network search scheme and first-principles calculations, we have systematically studied the low-energy crystal structures of Na2FeSiO4. We show that the low-energy crystal structures with different space group symmetries can be classified into several families based on the topologies of their Fe-Si networks. In addition to the diamond-like network which is shared by most of the low-energy structures, another three robust Fe-Si networks are also found to be stable during the charge/discharge process. The electrochemical properties of representative structures from these four different Fe-Si networks in Na2FeSiO4 and Li2FeSiO4 are investigated and found to be strongly correlated with the Fe-Si network topologies. Our studies provide a new route to characterize the crystal structures of Na2FeSiO4 and Li2FeSiO4 and offer useful guidance for the design of promising cathodes for Na/Li ion batteries. PMID:27523264

  3. Crystallization behavior and magnetic properties in High Fe content FeBCSiCu alloy system

    International Nuclear Information System (INIS)

    High Fe content FeBCSiCu nanocrystalline alloys are prepared by annealing melt-spun amorphous ribbons with aim at increasing saturation magnetic flux density. Microstructures identified by XRD and TEM reveal that Cu addition inhibits the surface crystallization of Fe86B7C7 alloy and improve its glass-forming ability. Activation energy of crystallization calculated by Kissinger's equation indicates that both Cu and Si addition promotes the precipitation of α-Fe phase and improves the thermal stability. VSM and DC B–H loop tracer measurements show that the Fe85.5B7C6Si1Cu0.5 nanocrystalline alloy exhibits high saturation magnetic flux density of 1.8 T and low coercivity of 10 A/m, respectively. AC properties measured by AC B–H analyzer show this alloy exhibits low core loss of 0.35 W/kg at 1 T at 50 Hz. Low material cost and convenient productivity make the Fe85.5B7C6Si1Cu0.5 nanocrystalline alloy an economical application in industry. - Highlights: • Cu addition inhibits the surface crystallization and improves the GFA. • The competitive formation of Fe3C and α-Fe phase impedes the devitrification. • Fe85.5B7C6Si1Cu0.5 nanocrystalline alloy exhibits excellent magnetic properties. • The alloy system has an economical advantage and convenient productivity

  4. Fe-Vacancy-Induced Ferromagnetism in Tetragonal FeSe Thin Films

    Institute of Scientific and Technical Information of China (English)

    LI Yong-Feng; LIU Gui-Bin; SHI Li-Jie; LIU Bang-Gui

    2009-01-01

    Motivated by recent experiments,we investigate structural,electronic,and magnetic properties of tetragonal FeSe with Fe vacancies using the state-of-the-art first-principles method.We show that Fe vacancies tend to stay in the same one of the two sublattices and thus induce ferromagnetism in the ground-state phase.Our calculated net moment is in good agreement with the experimental data available.Therefore,the ferromagnetism observed in tetragonal FeSe thin films is explained.It could be made controllable soon for spintronic applications.

  5. Studies on the valence electronic structure of Fe and Ni in FeNi1- alloys

    Indian Academy of Sciences (India)

    D K Basa; S Raj; H C Padhi; M Polasik; F Pawlowski

    2002-05-01

    -to- X-ray intensity ratios of Fe and Ni in pure metals and in FeNi1- alloys ( = 0.20, 0.50, 0.58) exhibiting similar crystalline structure have been measured following excitation by 59.54 keV -rays from a 241Am point source, to understand as to why the properties of permalloy Fe0.2Ni0.8 is distinct from other alloy compositions. It is observed that the valence electronic structure of Fe0.2Ni0.8 alloy is totally different from other alloys which may be attributed to its special magnetic properties.

  6. Magnetic and structural characterizations on nanoparticles of FePt, FeRh and their composites

    Energy Technology Data Exchange (ETDEWEB)

    Ko, Hnin Yu Yu [Information Storage Materials Laboratory, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511 (Japan)], E-mail: hnin@toyota-ti.ac.jp; Suzuki, Takao; Nam, Nguyen T.; Phuoc, Nguyen N.; Cao Jiangwei [Information Storage Materials Laboratory, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511 (Japan); Hirotsu, Yoshihiko [ISIR, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)

    2008-11-15

    The various compositions of FePt and FeRh nanoparticles, and their composite particles have been fabricated by the solution-phase chemical method and their magnetic properties characterized. High-resolution transmission electron microscopic observations indicate that mono-dispersed FeRh and FePt/FeRh nanoparticles are fabricated with the average size of 3-5 nm. However, larger size particles are distributed in the annealed state. From X-ray diffraction results, the as-deposited FeRh nanoparticles reveal a chemically disordered fcc structure which can be transformed into CsCl-type structure through thermal annealing. Similarly, the annealed FePt nanoparticles show the L1{sub 0}-phase fct structure although the fcc structure is apparent in the as-deposited state. It is also found that the first time in the exchange bias effect in the composite of ferromagnetic (FePt) and anti-ferromagnetic (FeRh) nanoparticles; result in a shift of the hysteresis loop after field cooling process.

  7. Magnetic structure of molecular magnet Fe[Fe(CN)6]·4H2O

    Indian Academy of Sciences (India)

    Amit Kumar; S M Yusuf

    2004-08-01

    We have studied the magnetic structure of Fe[Fe(CN)6]·4H2O, prepared by precipitation method, using neutron diffraction technique. Temperature dependent DC magnetization study down to 4.2 K shows that the compound undergoes from a high temperature disordered (paramagnetic) to an ordered magnetic phase transition at 22.6 K. Rietveld analysis of neutron diffraction pattern at 60 K (in its paramagnetic phase) revealed a face centred cubic structure with space group Fm3m. The structure contains three-dimensional network of straight Fe3+ –C≡N–Fe3+ chains along the edges of the unit cell cube. Fe3+ ions occupy 4 (0, 0, 0) and 4 (1/2, 1/2, 1/2) positions. Fe3+ (0, 0, 0) is surrounded octahedrally by six nitrogen atoms and Fe3+ (1/2, 1/2, 1/2) is surrounded octahedrally by six carbon atoms. Magnetic Rietveld refinement of neutron diffraction data at 11 K shows a ferromagnetic coupling between the two inequivalent Fe3+ sites. Refinement yielded an ordered moment of 4.4(6) and 0.8(6) B per Fe ion located at (0, 0, 0) and (1/2, 1/2, 1/2), respectively. Ordered moments are found to align along the face diagonal. The observed net moment from low temperature neutron diffraction study is consistent with DC magnetization results.

  8. Laser pyrolysis fabrication of ferromagnetic gamma'-Fe4N and FeC nanoparticles

    Science.gov (United States)

    Grimes, C. A.; Qian, D.; Dickey, E. C.; Allen, J. L.; Eklund, P. C.

    2000-01-01

    Using the laser pyrolysis method, single phase gamma'-Fe4N nanoparticles were prepared by a two step method involving preparation of nanoscale iron oxide and a subsequent gas-solid nitridation reaction. Single phase Fe3C and Fe7C3 could be prepared by laser pyrolysis from Fe(CO)5 and 3C2H4 directly. Characterization techniques such as XRD, TEM and vibrating sample magnetometer were used to measure phase structure, particle size and magnetic properties of these nanoscale nitride and carbide particles. c2000 American Journal of Physics.

  9. The behavior of Fe3+/∑Fe during partial melting of spinel lherzolite

    Science.gov (United States)

    Gaetani, Glenn A.

    2016-07-01

    This study presents an internally consistent model for the behavior of Fe3+/∑Fe during partial melting of spinel lherzolite. The Fe3+/∑Fe ratio for olivine is calculated on the basis of point defect thermodynamics, and the oxidation states of iron in the other solid phases are calculated using Fe3+/Fe2+ distribution between olivine and orthopyroxene, clinopyroxene, or spinel. Conservation of mass is used to relate the Fe3+/Fe2+ ratio of partial melt to the concentrations of Fe3+ and Fe2+ in the initial and residual solids as a function of pressure, temperature, and oxygen fugacity. Results from isobaric batch melting calculations demonstrate that the Fe3+/∑Fe ratio of the partial melt decreases with increasing melt fraction. Conversely, the Fe3+/∑Fe ratio of the partial melt increases with increasing melt fraction during decompression batch melting. The relative oxygen fugacity of the upper mantle depends on both the oxidation state of iron and mantle potential temperature. Results from incremental decompression melting calculations in which 1% melt is produced for each 100 MPa of decompression and then removed from the residual solid indicate that relative oxygen fugacity calculated from the oxidation state of iron in basaltic glass does not represent a unique value for the oceanic upper mantle but, rather, reflects conditions in the lower portion of the melting regime. A 100 °C change in mantle potential temperature produces a change in relative oxygen fugacity of ∼0.8 log units, similar to the global range inferred from mid-ocean ridge basalt glasses. It is necessary, therefore, to compare relative oxygen fugacity calculated from basaltic glass with proxies for potential temperature before drawing conclusions on heterogeneity of the oxidation state of iron in the oceanic upper mantle. Results from model calculations also suggest that the sub-arc mantle is intrinsically more oxidizing than the oceanic mantle because it is cooler. The global correlation

  10. FeII/MgII, [Fe/Mg] Ratios and High-z Quasars

    CERN Document Server

    Korista, K; Corbin, M R; Freudling, W; Korista, Kirk; Kodituwakku, Nalaka; Corbin, Michael; Freudling, Wolfram

    2003-01-01

    It has been suggested in the literature that the (Fe/alpha) abundance ratio may be used as a chronometer, due to a delay in this ratio reaching its solar value as predicted by galactic chemical evolution models. Using grids of photoionization models along a sequence of the (Fe/Mg) abundance ratio vs.\\ metallicity with time in a giant elliptical starburst scenario, we investigate the relationship between the (Fe/Mg) abundance ratio and the FeII/MgII emission line flux ratio under the assumption that these lines originate in photoionized clouds within the broad emission line regions of quasars.

  11. Investigation of correlation effects in FeSe and FeTe by LDA + U method

    Energy Technology Data Exchange (ETDEWEB)

    Lohani, H.; Mishra, P.; Sekhar, B.R., E-mail: sekhar@iopb.res.in

    2015-05-15

    Highlights: • Comparative study of the influence of U and J in FeSe and FeTe. • We found correlation effects are strong in Fe-3d orbitals in FeSe and FeTe. • Correlation effects are orbital selective in nature. - Abstract: We present a comparative study of the influence of Coulomb interaction and Hund’s coupling on the electronic structure of FeSe and FeTe. Our calculations are based on density functional theory (DFT) with local density approximation (LDA + U) framework employed in TB-LMTO ASA code. We found the correlation effects are orbital selective due to the strength of interorbital hybridization among the different Fe-3d orbitals mediated via the chalcogen (Se/Te-p) orbitals and are different in both the compounds. The Coulomb interaction is screened significantly by Te-p bands in FeTe. Similarly the orbital selection is different in both the compounds because of the difference in the chalcogen height.

  12. Implementación de guías de buenas prácticas clínicas elaboradas por Registered Nurses Association of Ontario (RNAO en el curriculum de Enfermería Universidad de Chile / Implementation of Clinical Best Practice Guidelines Done by The Registered Nurses’ Association of Ontario (RNAO in the Nursing Curriculum at Universidad de Chile / Implementação de manuais de boas práticas clínicas desenvolvidas por Registered Nurses Association of Ontario (RNAO no currículo de Enfermagem da Universidade do Chile

    Directory of Open Access Journals (Sweden)

    Amalia Silva-G, Lic. en Enf. y Obstetricia, Mg., PhD. (c

    2015-03-01

    Full Text Available Introducción: La investigación desarrollada en enfermería en el último tiempo ha permitido generar conocimientos que aportan a mejorar el cuidado de salud que otorgan los profesionales, se han confeccionado protocolos y guías clínicas con la finalidad de ofrecer a los profesionales de la salud la mejor evidencia para la práctica clínica, viéndose beneficiadas con ello, principalmente, las personas que requieren cuidados y también las instituciones al disminuir sus costos. Para llegar a esta meta es indispensable la capacitación continua de los profesionales de la salud y la inclusión de la formación de estos contenidos en los programas de las instituciones formadoras. Objetivo: Este artículo presenta la experiencia de implementación de cuatro guías de buena práctica clínica elaboradas por Registered Nurses’ Association of Ontario (RNAO en dos planes de formación que se encontraba desarrollando en el Departamento / Escuela de Enfermería de la Universidad de Chile para los profesionales de enfermería. Metodología: Para la metodología de implementación se consideró como marco de referencia el material elaborado para este fin por parte de la organización RNAO denominado “Recursos para el Docente”, se apoya en modelos de desarrollo y progresión del aprendizaje como el modelo de Patricia Benner para la elaboración de la hipótesis de progresión de los contenidos en el curriculum de Enfermería, como también la pirámide de Miller para la evaluación de las competencias. Conclusiones: se espera que los estudiantes una vez terminada su formación cuenten con las herramientas implementadas bajo esta metodología, las cuales les permitan un desempeño profesional fundamentado en cuidados de enfermería basados en la evidencia científica. [Silva-G A. Implementación de guías de buenas prácticas clínicas elaboradas por Registered Nurses Association of Ontario (RNAO en el curriculum de Enfermería Universidad de Chile

  13. Magnetism in bcc and fcc Fe with carbon and manganese.

    Science.gov (United States)

    Medvedeva, N I; Van Aken, D; Medvedeva, J E

    2010-08-11

    Density functional theory calculations were performed to study the structure and magnetic properties of bcc (α) and fcc (γ) Fe with 3 at.% carbon and manganese impurities. We find that all bcc-based Fe, Fe-C and Fe-Mn-C phases exhibit a ferromagnetic (FM) ground state, while the antiferromagnetic double-layer (AFMD) state is lowest in energy within the collinear spin approach in fcc Fe, Fe-C and Fe-Mn-C phases. However, the carbon and manganese impurities affect the local magnetic interactions significantly. The states with opposite manganese magnetic moments are quasi-degenerate in bcc Fe-Mn alloy, whereas octa-site carbon stabilizes ferromagnetic coupling of the nearest manganese atom with the Fe host. We demonstrate that the antiferromagnetic (AFM) fcc Fe-C and Fe-Mn-C alloys are intrinsically inhomogeneous magnetic systems. Carbon frustrates the local magnetic order by reorientation of magnetic moments of the nearest Mn and Fe atoms, and favors their ferromagnetic coupling. The competition between ferromagnetic and antiferromagnetic Fe-Fe and Fe-Mn interactions and the local magnetovolume instability near carbon may give rise to the spin-glass-like regions observed in austenitic Fe-Mn-C alloys.

  14. Magnetism in bcc Fe-Al alloy

    Energy Technology Data Exchange (ETDEWEB)

    Elzain, M.E. [Sultan Qaboos Univ., Al-Khod (Oman). Dept. of Phys.; Yousif, A.A. [Sultan Qaboos Univ., Al-Khod (Oman). Dept. of Phys.

    1994-11-01

    The magnetic moment {mu}, hyperfine field B{sub hf} and isomer shift IS at the Fe site in bcc Fe-Al alloys were calculated from first principle. Contrary to the belief that Al atoms reside in the iron lattice as magnetic holes, it was found that the local magnetic moment of Fe is decreased when Al is at a nearest neighbour site (NN), while it increases if Al is at a next-nearest neighbour site (NNN). Consequently, the average {mu} per Fe atom was found to be, initially, independent of Al content. Assuming a linear dependence of {mu}{sub Fe} on the number of Al atoms at NN and NNN sites, we calculated the average {mu}, which was found to agree with experimental results of cold worked alloys for disordered Fe-Al alloy. On the other hand, antiferromagnetic coupling appears in the CsCl ordered structures. The average B{sub hf} was also calculated and compared to experimental data and the trends in the IS are considered. (orig.)

  15. Electron-ion Recombination of Fe X forming Fe IX and of Fe XI forming Fe X: Laboratory Measurements and Theoretical Calculations

    CERN Document Server

    Lestinsky, M; Bernhardt, D; Grieser, M; Hoffmann, J; Lukić, D; Müller, A; Orlov, D A; Repnow, R; Savin, D W; Schmidt, E W; Schnell, M; Schippers, S; Wolf, A; Yu, D

    2009-01-01

    We have measured electron-ion recombination for Fe$^{9+}$ forming Fe$^{8+}$ and for Fe$^{10+}$ forming Fe$^{9+}$ using merged beams at the TSR heavy-ion storage-ring in Heidelberg. The measured merged beams recombination rate coefficients (MBRRC) for relative energies from 0 to 75 eV are presented, covering all dielectronic recombination (DR) resonances associated with 3s->3p and 3p->3d core transitions in the spectroscopic species Fe X and Fe XI, respectively. We compare our experimental results to multi-configuration Breit-Pauli (MCBP) calculations and find significant differences. From the measured MBRRC we have extracted the DR contributions and transform them into plasma recombination rate coefficients (PRRC) for astrophysical plasmas with temperatures from 10^2 to 10^7 K. This spans across the regimes where each ion forms in photoionized or in collisionally ionized plasmas. For both temperature regimes the experimental uncertainties are 25% at a 90% confidence level. The formerly recommended DR data sev...

  16. Grupo de Ajuda Mútua e Qualidade de Vida dos Cuidadores dos Doentes de Alzheimer: um estudo sobre o GAM de Pombal

    OpenAIRE

    Baptista, Cristina Gomes Ribeiro; Almeida, Helena Neves (Orientadora)

    2008-01-01

    Perante a falta ou escassez das redes familiares, de amigos e vizinhos, os Grupos de Ajuda Mútua surgem como uma rede social de apoio que proporciona aos doentes de Alzheimer e seus cuidadores a mudança para melhorar a sua qualidades de vida. O objectivo do estudo foi analisar o contributo do Grupo de Ajuda Mútua na melhoria da qualidade de vida dos cuidadores dos doentes de Alzheimer. Utilizou-se uma abordagem essencialmente qualitativa, mas com alguns aspectos quantitativos, par...

  17. Coherent interfacial bonding on the FeAs tetrahedron in Fe/Ba(Fe(1-x)Co(x))2As2 bilayers

    OpenAIRE

    Thersleff, Thomas; Iida, Kazumasa; Haindl, Silvia; Kidszun, Martin; Pohl, Darius; Hartmann, Andreas; Kurth, Fritz; Haenisch, Jens; Huehne, Ruben; Rellinghaus, Bernd; Schultz, Ludwig; Holzapfel, Bernhard

    2010-01-01

    We demonstrate the growth of epitaxial Fe/Ba(Fe(1-x)Co(x))2As2 (Fe/Ba-122) bilayers on MgO(001) and LSAT(001) single crystal substrates using Pulsed Laser Deposition (PLD). By exploiting the metallic nature of the FeAs tetrahedron in the Ba-122 crystal structure, we achieve a coherent interfacial bond between bcc iron and Co-doped Ba-122. Tc values for both bilayers were close to that of the PLD target. Direct observation of interfacial bonding between Fe and the Ba-122 FeAs sublattice by ato...

  18. Growth and magnetic properties of ultrathin epitaxial FeO films and Fe/FeO bilayers on MgO(001)

    Energy Technology Data Exchange (ETDEWEB)

    Kozioł-Rachwał, A., E-mail: akoziol@agh.edu.pl [Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków (Poland); National Institute of Advanced Industrial Science and Technology, Spintronics Research Center, Tsukuba, Ibaraki 305-8568 (Japan); Ślęzak, T. [Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków (Poland); Nozaki, T.; Yuasa, S. [National Institute of Advanced Industrial Science and Technology, Spintronics Research Center, Tsukuba, Ibaraki 305-8568 (Japan); Korecki, J. [Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków (Poland); Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków (Poland)

    2016-01-25

    Ultrathin FeO(001) films were grown via molecular beam epitaxy on MgO(001) using reactive deposition of Fe. The growth conditions were adjusted toward stabilization of the wüstite phase, the existence of which was confirmed by means of conversion electron Mössbauer spectroscopy. It was shown how the metallic Fe overlayer modified the chemical state and the magnetic properties of the FeO oxide. Finally, we observed the exchange bias for an epitaxial Fe/FeO bilayer grown on MgO(001)

  19. Dos años entre los indios

    Directory of Open Access Journals (Sweden)

    Ardila Ardila Olga Felisa

    1996-06-01

    Full Text Available

    La obra constituye la traducción del alemán publicada originalmente en dos volúmenes por E. Wasmuth en Berlín en 1909. En 1967 la Akademische Druck-u Verlagsanstalt en Graz (Austria publicó la segunda edición de la obra original, sobre la cual se trabajó la presente versión en español. La traducción estuvo a cargo de la antropóloga María Mercedes Ortiz. Koch-Grünberg se dedicó al estudio de la filología clásica pero con el tiempo se fue interesando cada vez más por el estudio de los pueblos autóctonos de Suramérica. En 1903 realizó su primera expedición a partir del noroeste brasilero hasta Colombia, en la región comprendida entre el alto río Negro y el Yapurá, área muy poco explorada hasta el momento. La obra Dos años entre los indios resume los resultados básicos de esta expedición. El autor alemán presenta el relato de sus cuatro viajes e ilustra con un mapa la ruta de su expedición a partir del Amazonas. Además del noroeste brasilero, el autor recorre un área importante del territorio colombiano, especialmente la zona del actual departamento del Vaupés. El libro está escrito en forma de un diario de viaje en el que se destacan sus observaciones etnográficas y lingüísticas, especialmente en lo que respecta a la cultura material, el ritual, el arte, las diferentes lenguas nativas habladas en la región y las relaciones de afinidad existentes entre dichas lenguas.

  20. Magnetic and optical properties of polycarbonate/Fe nanocomposites

    Institute of Scientific and Technical Information of China (English)

    Ya SHI; Zheng-cao LI; Chun-hua XU; Wei MIAO; Yu-quan WANG; Zheng-jun ZHANG

    2008-01-01

    The magnetic and optical properties of poly-carbonate (PC)/Fe nanocomposite films prepared by a solution blended process and the role of Fe additives are investigated. The saturation magnetization of the PC/Fe nanocomposites depends on the weight of Fe nanoparti-cles. Meanwhile, an increase of photoluminescence (PL) intensity with decreasing Fe additives is interpreted. The optical band gap corresponds to the increase of PL ele-ments. The transmittance of the films increases with reduced Fe, and the PL peak energy of PC/Fe composites is also correlated to the weight ratio.

  1. Physical conditions in CaFe interstellar clouds

    OpenAIRE

    Gnacinski, P.; Krogulec, M.

    2007-01-01

    Interstellar clouds that exhibit strong Ca I and Fe I lines were called CaFe clouds. The ionisation equilibrium equations were used to model the column densities of Ca II, Ca I, K I, Na I, Fe I and Ti II in CaFe clouds. The chemical composition of CaFe clouds is that of the Solar System and no depletion of elements onto dust grains is seen. The CaFe clouds have high electron densities n=1 cm^-3 that leads to high column densities of neutral Ca and Fe.

  2. Considerações gerais sôbre os órgãos odoríferos sexuais dos machos dos Lepidópteros

    Directory of Open Access Journals (Sweden)

    Rudolf Barth

    1953-12-01

    Full Text Available São determinadas as seguintes regras sôbre a função dos órgãos odoríferos dos machos dos Lepidópteros: l.ª regra: A secreção das glândulas age em forma de gás sobre a fêmea diminuindo a reação normal de fuga e provocando a disposição e preparação para a copulação. 2.ª regra: Os órgãos odoríferos nos machos de um grupo de espécies parentes encontram-se constantemente nos mesmos órgãos possuindo o mesmo tipo de estrutura (constância orgânica . 3.ª regra: As partes quitinosas (escamas odoríferas, cerdas distribuidoras, inserções etc. são especificadas para cada espécie (constância de forma. 4.ª regra: O grau de desenvolvimento e com isto o grau de eficiência dos órgãos odoríferos dos Lepidópteros noturnos é sempre mais elevado do que os dos diurnos.

  3. Abordagem teórica dos condicionantes da formação e consolidação dos parques tecnológicos

    Directory of Open Access Journals (Sweden)

    Alexandre Augusto Pereira Gaino

    2014-03-01

    Full Text Available O artigo discute as condições teóricas para a instalação e consolidação dos parques tecnológicos, mecanismos utilizados na promoção da inovação tecnológica e do desenvolvimento regional, alvo de diversas iniciativas de políticas públicas na atualidade. Para a consecução desse objetivo foi adotada uma abordagem teórica e exploratória, por meio de revisão bibliográfica, em especial de referências internacionais. O artigo apresenta e analisa diversos conceitos e definições de parque tecnológico e constata que essa diversidade decorre das diferentes realidades regionais e das variadas motivações dos stakeholders. O papel dos parques tecnológicos no desenvolvimento regional assume múltiplas feições em decorrência dos distintos interesses dos atores envolvidos em sua instalação. O artigo enfatiza e adverte que há importantes limitações da ideia de que o sucesso do parque depende fundamentalmente da capacidade de cooperação e mobilização de recursos por parte dos agentes envolvidos.

  4. First Principles Study on FeAs Single Layers

    Institute of Scientific and Technical Information of China (English)

    Jun Dai; Zhenyu Li; Jin-long Yang

    2009-01-01

    FeAs- single layer is tested as a simple model for LaFeAsO and BaFe2As2 based on firstprinciples calculations using generalized gradient approximation (GGA) and GGA+U. The calculated single-layer geometric and electronic structures are inconsistent with that of bulk materials. The bulk collinear antiferromagnetic ground state failed to be obtained in the FeAs- single layer. The monotonous behavior of the Fe-As distance in z direction upon electron or hole doping is also in contrast with bulk materials. The results indicate that,in LaFeAsO and BaFe2As2, interactions between FeAs layer and other layers beyond simple charge doping are important, and a single FeAs layer may not represent a good model for Fe based superconducting materials.

  5. Environmental embrittlement of intermetallic compounds in Fe-Al alloys

    Institute of Scientific and Technical Information of China (English)

    张建民; 张瑞林; S.H.YU; 余瑞璜

    1996-01-01

    First,it is proposed that hydrogen atoms occupy the interstitial sites in Fe3Al and FeAl.Then the environmental embrittlement of intermetallic compounds in Fe-Al alloys is studied in the light of calculated valence electron structures and bond energy of Fe3Al and FeAl containing hydrogen atoms.From the analyses it is found that the states of metal atoms will change,in which more lattice electrons will become covalent electrons to bond with hydrogen atoms when the atomic hydrogen diffuses into the intermetallic compounds in Fe-Al alloys,which will result in the decrease of local metallicity in Fe3Al and FeAl.Meanwhile,it is found that the crystal will easily cleave since solute hydrogen bonds with metal atoms and severely anisotropic bonds form.As a conclusion,these factors result in the environmental embrittlement of Fe3Al and FeAl.

  6. Sistema de Gestión de la Calidad y de Buenas Prácticas en la Producción de Animales Experimentales Producidos en Condiciones Convencionales (System of Administration of the Quality and of Good Practical in the Production of Produced Experimental Animals under Conventional Conditions

    Directory of Open Access Journals (Sweden)

    Hernández Roca, Amarilis

    2010-06-01

    Full Text Available ResumenLa disponibilidad de animales con una alta calidad genética y microbiológica para la investigación es un importante problema para lograr la confiabilidad de los resultados. Para mejorar el nivel de experimentación animal, es esencial el establecimiento de sistemas de producción, la estandarización de parámetros de calidad genéticos e higiénico sanitarios para los animales y la creación de un sistema de vigilancia que garantice que estos cumplan con las exigencias necesarias y mantengan su status microbiológico para garantizarlas investigaciones Este trabajo recoge el Diseño, implantación y evaluación el de un Sistema de Gestión de Calidad basado en las Normas ISO 9000 y de Buenas Prácticas en la Producción de Animales Experimentales producidos en condiciones Convencionales. El estudio comprendió el período 9 años del 2000 al 2008. La interacción entre ambos sistemas no es antagónica ni excluyente, por el contrario, tiene un efecto sinérgico cualquiera sea su ámbito de aplicación ya que los requisitos generales del Sistema de Gestión de la Calidad contribuyen a garantizar que se cumplan los requisitos de lasBuenas Practicas Producción específicas, facilitando su reconocimiento. Con la implantación de ambos sistemas ha permitido trabajar con excelencia logrando indicadores productivos y reproductivos de eficiencia, ventas superiores en cantidad y calidad, disminución de las quejas y reclamaciones, mejores relaciones con los clientes y órganos reguladores, además de obtener resultados satisfactorios en inspecciones de organizaciones nacionales e internacionales. Así como, mantener las licencias para laTenencia y reproducción de diferentes especies y líneas de animales.SummaryThe readiness of animals with a high genetic quality and microbiological for the investigation is an important problem to achieve the dependability of the results. To improve the level of animal experimentation, it is essential the

  7. Online spectrophotometric determination of Fe(II) and Fe(III) by flow injection combined with low pressure ion chromatography

    Science.gov (United States)

    Chen, Shujuan; Li, Nan; Zhang, Xinshen; Yang, Dongjing; Jiang, Heimei

    2015-03-01

    A simple and new low pressure ion chromatography combined with flow injection spectrophotometric procedure for determining Fe(II) and Fe(III) was established. It is based on the selective adsorption of low pressure ion chromatography column to Fe(II) and Fe(III), the online reduction reaction of Fe(III) and the reaction of Fe(II) in sodium acetate with phenanthroline, resulting in an intense orange complex with a suitable absorption at 515 nm. Various chemical (such as the concentration of colour reagent, eluant and reductive agent) and instrumental parameters (reaction coil length, reductive coil length and wavelength) were studied and were optimized. Under the optimum conditions calibration graph of Fe(II)/Fe(III) was linear in the Fe(II)/Fe(III) range of 0.040-1.0 mg/L. The detection limit of Fe(III) and Fe(II) was respectively 3.09 and 1.55 μg/L, the relative standard deviation (n = 10) of Fe(II) and Fe(III) 1.89% and 1.90% for 0.5 mg/L of Fe(II) and Fe(III) respectively. About 2.5 samples in 1 h can be analyzed. The interfering effects of various chemical species were studied. The method was successfully applied in the determination of water samples.

  8. EPR and (57)Fe ENDOR investigation of 2Fe ferredoxins from Aquifex aeolicus.

    Science.gov (United States)

    Cutsail, George E; Doan, Peter E; Hoffman, Brian M; Meyer, Jacques; Telser, Joshua

    2012-12-01

    We have employed EPR and a set of recently developed electron nuclear double resonance (ENDOR) spectroscopies to characterize a suite of [2Fe-2S] ferredoxin clusters from Aquifex aeolicus (Aae Fd1, Fd4, and Fd5). Antiferromagnetic coupling between the Fe(II), S = 2, and Fe(III), S = 5/2, sites of the [2Fe-2S](+) cluster in these proteins creates an S = 1/2 ground state. A complete discussion of the spin-Hamiltonian contributions to g includes new symmetry arguments along with references to related FeS model compounds and their symmetry and EPR properties. Complete (57)Fe hyperfine coupling (hfc) tensors for each iron, with respective orientations relative to g, have been determined by the use of "stochastic" continuous wave and/or "random hopped" pulsed ENDOR, with the relative utility of the two approaches being emphasized. The reported hyperfine tensors include absolute signs determined by a modified pulsed ENDOR saturation and recovery (PESTRE) technique, RD-PESTRE-a post-processing protocol of the "raw data" that comprises an ENDOR spectrum. The (57)Fe hyperfine tensor components found by ENDOR are nicely consistent with those previously found by Mössbauer spectroscopy, while accurate tensor orientations are unique to the ENDOR approach. These measurements demonstrate the capabilities of the newly developed methods. The high-precision hfc tensors serve as a benchmark for this class of FeS proteins, while the variation in the (57)Fe hfc tensors as a function of symmetry in these small FeS clusters provides a reference for higher-nuclearity FeS clusters, such as those found in nitrogenase. PMID:22872138

  9. Purification and characterization of a FeMo cofactor-deficient MoFe protein.

    Science.gov (United States)

    Gavini, N; Ma, L; Watt, G; Burgess, B K

    1994-10-01

    Previous studies have shown that the nifH gene product is required for FeMo cofactor biosynthesis and insertion and that a delta nifH strain of Azotobacter vinelandii designated DJ54 accumulates a FeMo cofactor-deficient MoFe protein that is distinct from the FeMo cofactor-deficient protein synthesis by Nif B-, N-, or E- strains [Tal, S., Chun, T., Gavini, N., & Burgess, B. K. (1991) J. Biol. Chem. 266, 10654-10657]. Here we report the purification and activation of the MoFe protein from DJ54. The purified protein is an alpha 2 beta 2 tetramer that is indistinguishable from the wild-type MoFe protein by the criteria of SDS-polyacrylamide gel electrophoresis, native gel electrophoresis, and two-dimensional gel electrophoresis. It binds normally to its redox partner, the Fe protein, by the criterion of chemical cross-linking. It does not contain FeMo cofactor and does not catalyze significant C2H2 reduction or reduction-independent MgATP hydrolysis. It can, however, be activated with FeMo cofactor following the addition of the Fe protein and MgATP when an additional required component(s) is supplied by cell-free extracts from a delta nifD strain of A. vinelandii. The purified DJ54 MoFe protein does contain P-clusters by the criteria of metal analysis, CD spectroscopy, cluster extrusion, and electrochemical reduction of the POX state. In the presence of dithionite it exhibits an axial S = 1/2 EPR signal that integrates to 0.1-0.3 spin per alpha 2 beta 2 tetramer.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:7918402

  10. Properties of the FeS2 films sulfurized from the precursive Fe and Fe3O4%Fe和Fe3O4硫化制备的FeS2薄膜的性能

    Institute of Scientific and Technical Information of China (English)

    刘艳辉; 侯玲; 范多旺; 汪洋; 孟亮

    2006-01-01

    用溅射Fe和电沉积Fe3O4先驱体硫化制备出FeS2薄膜,研究了不同先驱体对硫化过程和FeS2薄膜性能的影响.结果表明,两种先驱体结晶成的FeS2能够在一定程度上保留先驱体形貌特征.Fe生成FeS2的热力学驱动力比较高,虽然可能生成FeS的过渡相;Fe硫化生成的薄膜平整致密,晶粒生长比较充分,尺寸较大,其禁带宽度接近理论值.Fe3O4硫化生成FeS2的热力学驱动力较低,生成的薄膜表面疏松多孔,晶粒细小;薄膜的晶界等面缺陷比例较大和几何连续性较低使其电阻率较高、禁带宽度和载流子迁移率低于Fe膜硫化FeS2薄膜.

  11. O caso Vera: Análise fenomenológico-existencial de uma experiência “fracassada” ou dos dilemas e dos impasses dos psicoterapeutas iniciantes

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    Georges Daniel Janja Bloc Boris

    2014-04-01

    Full Text Available O texto visa a demonstrar como a falta de conhecimento e de vivência dos diversos fundamentos dos enfoques fenomenológico-existenciais pode dificultar ou mesmo impedir o sucesso na prática do psicoterapeuta iniciante. De início, são feitas uma descrição e uma análise de alguns processos psicoterápicos de uma mesma cliente, acompanhada por diversos estagiários supervisionados pelo autor do artigo ao longo de três anos, apontando certos equívocos atribuídos às referidas limitações do aprendiz de psicoterapeuta. Em seguida, os dilemas e os conflitos do psicoterapeuta iniciante são discutidos, propondo sugestões para dar conta de tal situação. Finalmente, são apresentados alguns dos seus te­mas, a sua origem diversificada e parte dos múltiplos significados de uma orientação fenomenológico-existencial, apontando algumas de suas contribuições e aplicações à prática psicoterápica.

  12. O contrário dos direitos humanos (explicitando Zizek

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    J. A. Lindgren Alves

    2002-06-01

    Full Text Available O presente artigo analisa a situação atual dos direitos humanos, guiado pelas afirmações críticas do autor esloveno Slavoj Zizek, quando defende que a nova normatividade emergente para os direitos humanos acaba por ser a forma em que aparece o seu exato oposto. Abarcando os atentados de 11 de setembro, sem que isso se constitua o foco central do estudo, o artigo avalia a validade dessa afirmação ante as vicissitudes empíricas com que os direitos humanos vêm se defrontando nos últimos anos.The article analyses the current situation of human rights, guided by the critic affirmations of the Slovene author Slavoj Zizek, when he supports that the new emerging normativity of the human rights ends to be the form of appearance of its very opposite. Contemplating the 11th of September, without this constitutes the central focus of the study, the article evaluates the validity of these affirmations the empirical vicissitudes which the human rights have been facing in the last years.

  13. Dos viviendas unifamiliares en Madrid – España

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    Mas Sarrío, V.

    1974-10-01

    Full Text Available The two housings are located near the capital, in a small urbanisation of Pozuelo de Alarcón. The planning of both apartments is similar since the families occupying them and their requirements are quite alike. It has been attempted to give «movement» to the storeys, sections and elevations so as to avoid the static impression of a cube anchored to the ground and to give the sides different facets. The materials used are the traditional ones and are easy to maintain and we are of the opinion that the objectives established at the drafting of the project have been fully attained.Ambas están ubicadas en las proximidades de la capital, en una pequeña urbanización de Pozuelo de Alarcón. El programa desarrollado en las dos es similar, dado que las necesidades y familia de sus propietarios son muy parecidas. Se ha procurado dar «movimiento » a plantas, secciones y alzados, a fin de evitar el estatismo del cubo anclado en tierra, tratando de lograr distintas facetas según el punto de vista que se adopte. Los materiales empleados son tradicionales, de fácil entretenimiento, y consideramos plenamente conseguidos los objetivos exigidos al redactar el proyecto.

  14. uma proposta de análise dos erros

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    Ângela Maria V. Pinheiro

    2008-01-01

    Full Text Available El estudio investiga las estrategias utilizadas por niños brasileños en la lectura en voz alta de palabras aisladas. Tomando como foco la investigación de la naturaleza de los errores que generaron palabras reales, se han distinguido los tipos de respuestas que sugerían la utilización del proceso lexical (el reconocimiento automático de las palabras de aquellas que sugerían el uso del proceso fonológico (o la construcción de la pronunciación de la palabra por el uso de procedimientos de conversión grafema-fonema. Se concluyó que las "respuestas palabras reales", en el portugués brasileño, al contrario de la lengua inglesa, parecen indicar el uso del proceso fonológico de lectura, pues en las series estudiadas sólo una pequeña proporción de las respuestas denotó una influencia lexical, expresa por lexicalizaciones. Así, partiendo del proceso señalado por la respuesta, proponemos clasificar los errores de lectura en dos índices: uno indicativo de tendencia lexical y otro de tendencia fonológica. El análisis de errores propuesto puede ser utilizado para verificar el cambio de procesos de lectura a lo largo del desarrollo

  15. Dos edificios de viviendas - Valencia (España

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    García-Ordóñez, F. M.

    1972-09-01

    Full Text Available This article describes two blocks which have been built as housing communities, where there is a concentration of facilities and services, as well as the possibility of the flexible distribution of space, according to the needs of each family. The «Plaza de América» building is in one of the most interesting parts, with some of the best views of the city. It has a curved facade with continual openings, which favours the above-mentioned flexibility. The «Ciudadela» building is in the old Ciudadela sector, overlooking the Paseo de la Alameda and the Turia River. It consists of basement, ground floor and mezzanine floor for commercial purposes, and thirteen storeys for housing, it is a metal structure, built on piles, with D.C. flooring and concrete screens for bracing against the wind.Se describen dos edificios construidos para viviendas en régimen de comunidad, con los imperativos que esta circunstancia entraña en cuanta a concentración de servicios y posibilidad de una distribución flexible, según las necesidades de cada familia. El edificio «Plaza de América» está situado en uno de los puntos más singulares y de mejores vistas de la ciudad, con fachada curva y huecos continuos, lo que favorece la flexibilidad antes citada.

  16. GUANTÁNAMO NA SUPREMA CORTE DOS ESTADOS UNIDOS

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    Ana Luisa Zago de Moraes

    2011-04-01

    Full Text Available Após os atentados de 11 de setembro de 2001, o governo norte-americano iniciou  uma“guerra ao terrorismo”, sendo uma das medidas o aprisionamento de supostos terroristas  na Base Naval de Guantánamo, em Cuba, vedando aos detentos o acesso aos tribunais americanos e quaisquer direitos e os tratando como inimigos. Em resposta a essa situação, bem como aos atos normativos que regem o encarceramento, (não processamento e tratamento na prisão, a Suprema Corte Americana, durante o governo de George W. Bush, proferiu três decisões nos casos de terroristas presos nestas circunstâncias. Na primeira, concluiu que o Habeas Corpus é garantia que se estende a qualquer indivíduo; na segunda, invocou o direito internacional dos direitos humanos e salientou que todos os seres humanos são titulares de algum tipo de proteção com base apenas em sua própria humanidade; por fim, na última, afastou novas normas que excluíam a garantia de  Habeas Corpus e conclui que juntas militares não constituem um mecanismo justo para evitar a prisão de inocentes.

  17. A NATUREZA DOS ADJETIVOS PRÉ- E PÓS-NOMINAIS

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    Cristina de Souza Prim

    2011-01-01

    Full Text Available O objetivo deste artigo é apresentar algumas das contribuições e limitações da hipótese de movimento de núcleo, hoje bastante criticada pela literatura, para estudos relacionados a adjetivos do português brasileiro. Os autores que assumem tal hipótese defendem que adjetivos são gerados pré-nominalmente e que o movimento do nome sobre o adjetivo explica a ordem superficial não marcada (posposta ao nome, no DP. Há, no entanto, duas formas diferentes de analisar a natureza dos adjetivos que têm se destacado na literatura: de um lado, diversos autores, representados neste artigo por Crisma (1990, 1993, 1996, defendem que adjetivos entram nos DPs como especificadores de projeções funcionais específicas e, assim, são sempre XPs; de outro, autores como Bernstein (1993, por exemplo, defendem que adjetivos podem ser auxiliares ou adjuntos, isto é, podem ser núcleos ou XPs. Tal divergência aponta quais os problemas que uma nova hipótese deve enfrentar.

  18. OS EFEITOS DO RECALL DE PRODUTOS NAS ATITUDES DOS CONSUMIDORES

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    Celso Augusto de Mattos

    2003-12-01

    Full Text Available Recentemente têm sido comuns mensagens das montadoras de automóveis convidando os consumidores a comparecerem em lojas autorizadas para efetuar consertos ou trocas preventivas de peças. Essas mensagens, conhecidas por recall ou chamadas, são usualmente veiculadas em mídias de massa, como TV e jornais impressos, a fim de ter ampla divulgação. Embora pareça uma postura honesta e proativa, não se conhecem 05 seus efeitos sobre o comportamento do consumidor. Como este percebe essas mensagens? Quais as suas Intenções em relação a essas empresas que fizeram o recall? O uso de citações de fomecedores na mensagem faz alguma diferença? A fim de Investigar essas questões, foi realizada uma pesquisa com 204 consumidores, dos quais 142 (70% possuiam automóvel. Os resultados mostraram que somente a avaliação da imagem apresentou diferença significativa entre os grupos, tendo sido negativa no grupo com referência ao fornecedor e positiva no grupo sem referência, principalmente para os consumidores de alto envolvimento com o produto. As implicações gerendais e recomendações para novas pesquisas são também apresentadas.

  19. Dos proyectos de urbanización en Santiago

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    Pérez Franco, José Luis

    1995-08-01

    Full Text Available This article describes two actions of urbanization improvement in the city of Santiago. They are the reclamation of the shores of the Sarela river in the Carmen de Abaixo quarter and the arrangement of the Parque de la Alameda and Paseo de la Herradura Complex in the Santa Susana Reserve. Both actions are produced within the historical part of the city and although they deal with different formal and functional problems, they coincide in the use of traditional materials without the need to give up the possibility to undertake design and construction from a contemporary standpoint.

    En el presente artículo se describen dos actuaciones de mejora de la urbanización en la ciudad de Santiago. Se trata de la recuperación de las riberas del río Sarela en el barrio del Carmen de Abaixo y el acondicionamiento del Conjunto del Parque de la Alameda y Paseo de la Herradura en el Coto de Santa Susana. Ambas actuaciones se producen en el ámbito de la ciudad histórica y, si bien abordan problemas formales y funcionales diferentes, coinciden en el empleo de los materiales tradicionales sin por ello renunciar a la posibilidad de proyectar y construir desde una posición contemporánea.

  20. Mutagenicidade e antimutagenicidade dos principais corantes para alimentos

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    ANTUNES Lusânia Maria Greggi

    2000-01-01

    Full Text Available Muitos compostos presentes nos alimentos, tanto naturalmente, como adicionados ou produzidos durante o processamento, já foram testados quanto à mutagenicidade ou antimutagenicidade em diferentes sistemas experimentais. O grande número de corantes para alimentos, naturais ou sintéticos, tem levado os pesquisadores a avaliar a mutagenicidade e/ou antimutagenicidade desses compostos. Alguns corantes sintéticos apresentaram potencial mutagênico e seu uso foi proibido em alguns países. Muitos corantes naturais testados apresentaram potencial antimutagênico em pelo menos um sistema-teste, entretanto, isto não quer dizer que os corantes naturais são inócuos. O corante natural curcumina, por exemplo, apresentou potencial antimutagênico nos testes in vivo e foi mutagênico nos testes in vitro. Este paradoxo ressalta a importância de uma avaliação criteriosa e ampla na avaliação da possível atividade mutagênica e/ou antimutagênica dos corantes.