WorldWideScience

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. La transgresión de la buena fe como causa de despido disciplinario

    OpenAIRE

    Manubens Soto, Marc

    2015-01-01

    La transgresión de la buena fe contractual aparece en la normativa como una causa de despido disciplinario muy difusa. Para concretarla, en el presente trabajo realizo un estudio de la doctrina jurisprudencial emitida los últimos años por el Tribunal Supremo y los Tribunales Superiores de Justicia, que han aportado las características comunes que reúnen los supuestos de vulneración, por parte de los trabajadores, del deber de buena fe que rige el vínculo laboral y que deben ser sancionados co...

  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

    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.

  7. La importancia de la buena fe en el Estado de Derecho: el caso de la legalidad laboral

    OpenAIRE

    Márquez Prieto, Antonio

    2014-01-01

    Reformas laborales recientes han reforzado la referencia a la buena fe como condición necesaria para la negociación en determinadas situaciones laborales. Ello constata la necesidad, constatada por el Derecho, de que exista por parte de los agentes jurídicos una motivación intrínseca conectada con la necesidad de entrar en la racionalidad colectiva.

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

    OpenAIRE

    Boza Carreño, Ángel (Coordinador); 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

    Directory of Open Access Journals (Sweden)

    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. 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

    Directory of Open Access Journals (Sweden)

    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.

  11. 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...

  12. 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

    Directory of Open Access Journals (Sweden)

    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

  13. Buenas prácticas para un turismo sostenible

    OpenAIRE

    Rainforest Alliance; Banco Interamericano de Desarrollo (BID)

    2006-01-01

    Presentación sobre el cluster de turismo sostenible. Da a conocer el concepto de buenas prácticas, implementación de buenas prácticas y por último, una guía para estructurar un plan de buenas prácticas.

  14. Honestidad y buena fe: dos pilares en la ética de las publicaciones biomédicas Honesty and good faith: Two cornerstones in the ethics of biomedical publications

    Directory of Open Access Journals (Sweden)

    Humberto Reyes B

    2007-04-01

    Full Text Available The editors of medical journals should take the steps necessary to assure its readers that the contents of their publications are based in true data, that they are original and fulfill the ethical rules of biomedical and clinical research, including its reporting. This editors’ role has become increasingly difficult since the pressure to publish scientific papers is progressively stimulated by the role that those papers play in curricula vitae when the authors apply for university positions, academic promotions, research grants and for their personal prestige. As a consequence, increasing instances of misconduct in scientific publications are detected. Some cases are noticed during the editorial process, mostly when peer reviewers identify redundant publications or plagiarism. Other cases are denounced after a manuscript was published. It is the editors’ duty to verify the misconduct, request an explanation from the authors and, if their answer is unsatisfactory, report the problem to the institutional authorities supporting the authors. The editors should denounce the situation in a forthcoming issue of the journal. Universities should enforce the teaching of ethical rules that govern the report of scientific information. Revista Médica de Chile follows recommendations given by the International Committee of Medical Journal Editors, the World Association of Medical Editors and other groups, but honesty and good faith in all the actors involved in the process of biomedical publications (authors, reviewers, editors remain the cornerstones of scientific good behavior

  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. 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

    OpenAIRE

    Young, I.; A Rajić; Perez, E.; Sanchez, J.; A Larriestra; LA Perez; O Drivet; Monteverde, M.; SA McEwen

    2012-01-01

    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 c...

  17. Buenas prácticas de cuidados : creando procesos seguros

    OpenAIRE

    Jurado Balbuena, Juan José; Marcos Calvo, María Pilar; Serrano Molina, Lucía

    2010-01-01

    En este capítulo detallamos 5 actividades de cuidados muy frecuentes en la actividad diaria de los centros de salud. Gran parte de estas actividades es desarrollada por los profesionales de enfermería. Queremos resaltar su importante papel en facilitar una atención segura a nuestros pacientes revisando cómo conseguir buenas prácticas de cuidados en el día a día. Las úlceras por presión son prevenibles en muchos casos. Las recomendaciones, según el grado de evidencia serían: Los cambios de pos...

  18. El avance del derecho a la buena Administración en el Tratado de Lisboa

    OpenAIRE

    Guillem Carrau, Javier

    2010-01-01

    El Tratado de Lisboa liga directamente el derecho a la buena administración con los principios de trasparencia y participación. Este avance debe garantizar que el derecho a la buena administración no quede limitado por un excesivo carácter programá

  19. Efeito dos teores de Mn e de Fe na evolução microestrutural de duas ligas do sistema Al-Fe-Mn-Si obtidas por fundição contínua de chapas (Twin Roll Caster Effect of Mn and Fe contents on the microstructural evolution of two twin roll caster Al-Fe-Mn-Si alloys

    Directory of Open Access Journals (Sweden)

    Ricardo do Carmo Fernandes

    2008-06-01

    Full Text Available Com o crescimento constante da utilização do processo twin roll caster para a obtenção de chapas de alumínio, torna-se cada vez mais necessário um melhor conhecimento das características das chapas obtidas por este processo. Foram estudadas, nesse trabalho, duas ligas não tratáveis termicamente, 3003 (1,2%Mn; 0,6%Fe e 8106 (0,4%Mn; 1,5%Fe. As amostras foram retiradas de chapas com 7 mm de espessura a partir de bobinas brutas de fundição e após tratamento térmico de homogeneização de 500°C por 12 horas. As técnicas utilizadas para a caracterização das amostras foram: microscopia óptica com auxílio de luz polarizada, ensaio de microdureza, além dos ensaios de condutividade elétrica.The continuous growth in the usage of the twin roll caster process for aluminum plate production demands a better understanding of the plate's final characteristics. In this work two non-heat treatable largely-used aluminum alloys, namely 3003 (1.2%Mn; 0.6%Fe and 8106 (0.4%Mn; 1.5% Fe, have been studied. Samples were obtained from 7mm thick plates stemming from rolls in the as-cast condition and after 500°C/12h homogenizing heat treatment. The techniques employed in the sample characterization included: polarized light optical microscopy, microhardness and electrical conductivity tests.

  20. Manual de Buenas Prácticas Ambientales. EMPAI

    Directory of Open Access Journals (Sweden)

    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.

  1. 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...

  2. 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...

  3. 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...

  4. 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...

  5. V Jornada Campus Virtual UCM: buenas prácticas e indicios de calidad

    OpenAIRE

    Fernández-Valmayor Crespo, Alfredo; Sanz Cabrerizo, Amelia; Merino Granizo, Jorge, ed. lit.

    2009-01-01

    La V Jornada de Campus Virtual Filología de la Universidad Complutense se ha centrado en las buenas prácticas e indicios de calidad que, en su actividad cotidiana, ponen de manifiesto centros, profesores y estudiantes dentro de nuestro Campus. En el momento de definir las buenas prácticas si queremos estar en condiciones de reconocer y evaluar el trabajo de profesores y alumnos, echamos en falta indicadores e indicios de calidad, no contamos con modelos precisos para la enseñanza virtual q...

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. Buenas prácticas en la didáctica del Trabajo Social

    OpenAIRE

    Ramos Feijóo, Clarisa; Lorenzo García, Josefa; Dellavalle, Marilena; Ariño Altuna, Miren; Munuera Gómez, Pilar

    2013-01-01

    La importancia de la innovación educativa en la formación de profesionales de Trabajo Social nos enfrenta a la necesidad de crear sinergias para adecuar los contenidos a las vicisitudes de la compleja realidad social. La producción de conocimiento científico específico del área, va acompañada de la demanda de una capacitación en competencias que favorezcan la intervención social. El presente trabajo presenta un análisis descriptivo de cuatro actividades docentes identificadas como buenas prác...

  13. 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...

  14. 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.

  15. 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.

  16. Radium in groundwater close to Buena Lagoon in coastal zone of Rio de Janiero State, Brazil

    International Nuclear Information System (INIS)

    Groundwater close to the head of Buena Lagoon has a high salinity and low pH values. Radium is present predominantly as 228Ra. Factors responsible for the high radium mobility in groundwater seem to be the high salinity with the resulting competition for adsorption sites, and low pH values with the resulting limited adsorption of Ra2+ on positively charged surfaces of adsorbents. The behaviour of uranium and thorium is also influenced by their speciation and low pH conditions. Uranium is present as the positively charged uranyl ion UO22+ in low pH samples and is very mobile. Similarly, the presence of positively charged Th4+ and thorium complexes with sulphate result in relatively high thorium concentrations at a low pH range. On the other hand, the mobility of the phosphate released from the dissolution of monazite is probably reduced due to its adsorption and precipitation close to its source. (author)

  17. Manual de Buenas Prácticas en Comunicación

    Directory of Open Access Journals (Sweden)

    Julio César Serrano Caballero

    2010-01-01

    Full Text Available El término comunicación tan de uso en la actualidad, recoge dentro de sí, no solo una serie de procedimientos, manuales, estudios y resultados, es además en su yo interno un conjunto de parámetros para el diario bregar, el día a día; muchas de sus aplicaciones prácticas deben ser y en algunos casos lo son, parte integrante de las características de una persona y en su conjunto como el alma de la Empresa, la cual ha de ser consecuente con sus valores, lo que traducido a palabras sencillas es aquello que queremos ser y por lo cual trabajamos. Este trabajo reúne diversos aspectos de la cotidianeidad que en su conjunto y cumplidos, aportará buenas maneras que nos harán ser mejores personas y trabajadores eficientes.

  18. 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

  19. Las buenas prácticas en la atención a las personas adultas en situación de dependencia

    OpenAIRE

    Martínez, Teresa

    2014-01-01

    Artículo destinado a analizar el concepto de buena praxis profesional en relación a los cuidados de personas en situación de dependencia. Propone la atención centrada en la persona como modelo referencial para orientar la buena praxis profesional.

  20. Una buena razón para hablar de los «refugiados climáticos»

    OpenAIRE

    Gemenne, François

    2015-01-01

    El concepto de “refugiados medioambientales” o “refugiados climáticos” se ha ido abandonando de forma progresiva por carecer de base jurídica. Quisiera argumentar por qué existen buenas razones para emplear ese término.

  1. 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.

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

    Directory of Open Access Journals (Sweden)

    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

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

    Directory of Open Access Journals (Sweden)

    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.

  4. 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.

  5. 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...

  6. Los planos en ingeniería: formación en buenas prácticas de casos reales

    OpenAIRE

    Pérez Díaz, José Luis; Del Álamo García, Francisco Javier; Benito Gutiérrez, Daniel; Azorín, Javier; Adrados, Daniel; Gómez Molina, Lourdes; Lozano Durán, María Luisa; Jiménez Rodríguez, Enrique; Chocano Martín, Francisco

    2008-01-01

    Trabajos realizados por los alumnos de Expresión Gráfica de Ingeniería Técnica electrónica en el primer cuatrimestre del curso 2007/2008 dentro del programa de Innovación docente titulado "Los planos en el proyecto de ingeniería: formación en buenas prácticas de casos reales".

  7. 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.

  8. 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

  9. Phonon density of states in Fe/Cr (001) superlattices and Tb-Fe thin-film alloys

    International Nuclear Information System (INIS)

    Inelastic nuclear scattering of X-rays from the 14.413 keV nuclear resonance of 57Fe was employed to measure directly the Fe-projected phonon density of states (DOS) in MBE-grown Fe/Cr(00l) superlattices on MgO(001). The Moessbauer-inactive 56Fe isotope was used in the Fe layers. A 1 angstrom thick Moessbauer-active 57Fe-probe layer (95% enriched) was placed at different locations within the Fe layers. This procedure permits one to distinguish phonon density of states at the Fe-Cr-interface from that at the center of the Fe-film. Distinct differences have been observed in the DOS of our samples. The phonon DOS of an amorphous Tb33Fe67 alloy film was found to be a broad and structureless hump, contrary to that of an epitaxial TbFe2 film, which exhibits characteristic features

  10. 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...

  11. Estudio de comparación de procedimientos constructivos de Buenas Prácticas Ambientales en Carreteras

    OpenAIRE

    Ledesma Oloriz, Mikel

    2015-01-01

    RESUMEN: Se ha logrado elaborar un inventario completo de buenas prácticas ambientales aplicables a obras de carretera ejecutadas en distintos lugares del mundo, con una clasificación novedosa de los impactos ambientales en base a cinco elementos: aire, tierra, agua, fuego y vida, que permite una identificación rápida y clara de los mismos. Tras investigar acerca del cálculo de la huella de carbono en el sector de la construcción se ha encontrado que es algo relativamente novedoso que se hall...

  12. Mid-late Holocene environments of Agua Buena locality (34°50'S 69°56'W), Mendoza, Argentina

    Science.gov (United States)

    Navarro, Diego; Mehl, A.; Zarate, M. A.; Paez, M. M.

    2010-03-01

    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.

  13. Buenas prácticas en el ámbito educativo y su orientación a la gestión del conocimiento

    OpenAIRE

    Doris Jerí Rodríguez

    2008-01-01

    El artículo aporta diversas aproximaciones sobre uno de los conceptos que ha ido cobrando fuerza en la literatura educativa interesada en reconocer los avances de las escuelas: las buenas prácticas. Para ello el texto contribuye, sobre la base de la bibliografía actual, a rescatar las definiciones y alcances de este enfoque centrado en las buenas prácticas educativas. El artículo logra además presentar las contribuciones de este enfoque en el ámbito de la gestión del conocimiento en las organ...

  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. La divulgación de buenas y malas noticias por parte de las empresas cotizadas españolas

    Directory of Open Access Journals (Sweden)

    Óscar Suárez Fernández

    2015-12-01

    Full Text Available Al igual que la información de carácter cuantitativo, la información de naturaleza narrativa puede ser manipulada, pudiendo ser utilizada por los gestores para proyectar una imagen de la compañía no coincidente con la real, ocultando o maquillando la información para evitar las interpretaciones perjudiciales o al menos para reducirlas. El objetivo del presente trabajo es analizar si las sociedades cotizadas españolas realizan una selección de las noticias a divulgar, alterándose la neutralidad de la información narrativa. Los resultados alcanzados nos conducen a la conclusión de que la divulgación está orientada hacia las buenas noticias, tanto históricas como previsionales, independientemente del desempeño financiero obtenido por la compañía.

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

    OpenAIRE

    Jesús Valverde Berrocoso; María Rosa Fernández Sánchez; Francisco Ignacio Revuelta Domínguez

    2013-01-01

    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 exper...

  17. 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.

  18. 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.

  19. Buenas Prácticas en el Servicio Nacional de Empleo en Mexico con Base en el Análisis de Tres Estados

    OpenAIRE

    Christina Kappaz; Rosa Carvallo

    2010-01-01

    El presente estudio tiene como objeto investigar y documentar las buena prácticas del Servicio Nacional de Empleo (SNE) en México y asi contribuir tanto a su mejoramiento como al de los servicios afines en otros paises de América Latina.

  20. 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.

  1. The Heme-Based Oxygen-Sensor Phosphodiesterase Ec DOS (DosP: Structure-Function Relationships

    Directory of Open Access Journals (Sweden)

    Toru Shimizu

    2013-06-01

    Full Text Available Escherichia coli Direct Oxygen Sensor (Ec DOS, also known as Ec DosP is a heme-based O2-sensing phosphodiesterase from Escherichia coli that catalyzes the conversion of cyclic-di-GMP to linear di-GMP. Cyclic-di-GMP is an important second messenger in bacteria, highlighting the importance of understanding structure-function relationships of Ec DOS. Ec DOS is composed of an N-terminal heme-bound O2-sensing PAS domain and a C-terminal phosphodiesterase catalytic domain. Notably, its activity is markedly enhanced by O2 binding to the heme Fe(II complex in the PAS sensor domain. X-ray crystal structures and spectroscopic and catalytic characterization of the wild-type and mutant proteins have provided important structural and functional clues to understanding the molecular mechanism of intramolecular catalytic regulation by O2 binding. This review summarizes the intriguing findings that have obtained for Ec DOS.

  2. 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)

  3. From DOS to UNIX

    International Nuclear Information System (INIS)

    Union Pacific Resources (UPRC) is a large independent operator with about 100 petroleum engineers. UPRC has a reasonably sophisticated PC network with many hundreds of PC's connected via several local area network (LAN) servers. Essentially all engineers have a 386 based PC on their desk with access to a host of software packages, peripheral devices and to mainframe computers. Many engineers are now acquiring 486 based PC's. UPRC's solution has involved migrating from a DOS-based platform on individual user's desk to UNIX workstations. Dozens of UNIX workstations are networked; some are on the desk, while others are located in central locations. Reservoir simulation, geostatistical modeling, image processing and log analysis are now done exclusively on the UNIX workstations. Numerous DOS-based programs, however, have not yet been migrated into the UNIX environment. This paper describes the topography of both PC DOS and UNIX workstation networks in UPRC, and examine the flow of information in each network configuration to identify differences. The successes and failures of various techniques for providing access to both platforms will be presented

  4. 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.

  5. 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.

  6. 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

  7. 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

  8. Aproximación a un modelo integrado de buenas prácticas de innovación docente que apoyan la construcción y el desarrollo de las competencias genéricas

    OpenAIRE

    Bravo, Edna; Simó, Pep; Amante, Beatriz

    2010-01-01

    El objetivo principal de esta investigación es el diseño de un modelo de buenas prácticas de innovación docente, que sirva de apoyo a los profesores en la adaptación de asignaturas, preparación de actividades, desarrollo, evaluación y seguimiento de competencias genéricas. este modelo de buenas prácticas ha sido desarrollado en cuatro fases: 1) fundamentación teórica, 2) identificación de buenas prácticas de innovación docente, 3) construcción del modelo de buenas prácticas y, ...

  9. 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...

  10. 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.

  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. 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

  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. 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...

  16. Mid-late Holocene environments of Agua Buena locality (34{sup 0}50'S; 69{sup 0}56'W), Mendoza, Argentina

    Energy Technology Data Exchange (ETDEWEB)

    Navarro, Diego; Paez, M M [Laboratorio de Paleoecologia y Palinologia, Departamento de Biologia, Universidad Nacional de Mar del Plata, Funes 3350, (B7602AYL) Mar del Plata, Buenos Aires (Argentina); Mehl, A; Zarate, M A, E-mail: dnavarro@mdp.edu.a, E-mail: navarro.dd@gmail.co [INCITAP - Instituto de Ciencias de la Tierra y Ambientales de La Pampa. CONICET- Universidad Nacional de La Pampa, Uruguay 151, (L6300CLB) Santa Rosa, La Pampa (Argentina)

    2010-03-15

    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.

  17. 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

  18. Inibidores dos microtúbulos

    OpenAIRE

    Monteiro, AC

    2014-01-01

    Trabalho apresentado no Serviço de Oncologia do Hospital Prof. Doutor Fernando Fonseca, numa sessão de Farmaco-Oncologia, a 14/05/2014. As sessões eram destinadas à abordagem das diversas classes de citostáticos e outros fármacos usados no tratamento do cancro. Esta apresentação contempla a classe dos inibidores dos microtúbulos ou agentes anti- tubulina, abordando a natureza química bem como a farmacodinâmica e a farmacocinética dos compostos.

  19. Buenas prácticas para la mejora de procesos en el desarrollo de software y en procesos de gestión : Aplicación en PyMEs

    OpenAIRE

    Pesado, Patricia; Esponda, Silvia; Pasini, Ariel C.; Boracchia, Marcos; Swaels, Maximiliano; Bertone, Rodolfo Alfredo

    2014-01-01

    Los conceptos relacionados con las buenas prácticas y mejora de procesos, para obtener un desarrollo sistemático y confiable, evolucionan constantemente, por lo que es necesario ir adaptando nuestros procesos de gestión y desarrollo para que su evolución vaya a la par del crecimiento de los requisitos que presentan las buenas prácticas. El IIILIDI posee un grupo dedicado a la investigación y desarrollo de propuestas en temas relacionados con la mejora de los procesos de gestión y el asegurami...

  20. BUENAS PRÁCTICAS EN LOS PROGRAMAS EXTRAORDINARIOS DE ATENCIÓN A LA DIVERSIDAD EN CENTROS DE EDUCACIÓN SECUNDARIA. UNA MIRADA DESDE LA EXPERIENCIA

    OpenAIRE

    Antonio Luzón; Mónica Porto; Mónica Torres; Maximiliano Ritacco

    2009-01-01

    El presente trabajo se enmarca dentro de un proyecto I+D+I Estudiantes en riesgo de exclusión educativa en la ESO: situación, programas y buenas prácticas del que está dando cuenta este Monográfico. Tiene como objetivo general analizar las políticas educativas, las prácticas y los resultados que se están alcanzando con aquellos estudiantes que encuentran dificultades acusadas de seguir el currículo y la enseñanza regular en la ESO y que están, por tanto en situación extrema de riesgo de exclu...

  1. Review of mineral estate of the United States at Naval Petroleum Reserve No. 2, Buena Vista Hills Field, Kern County, California

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-08-09

    The purpose of this report is to present this Consultant`s findings regarding the nature and extent of the mineral estate of the United States at National Petroleum Reserve No. 2 (NPR-2), Buena Vista Hills Field, Kern County, California. Determination of the mineral estate is a necessary prerequisite to this Consultant`s calculation of estimated future cash flows attributable to said estate, which calculations are presented in the accompanying report entitled ``Phase II Final Report, Study of Alternatives for Future Operations of the Naval Petroleum and Oil Shale Reserves, NPR-2, California.`` This Report contains a discussion of the leases in effect at NPR-2 and subsequent contracts affecting such leases. This Report also summarizes discrepancies found between the current royalty calculation procedures utilized at NPR-2 and those procedures required under applicable agreements and regulations. Recommendations for maximizing the government`s income stream at NPR-2 are discussed in the concluding section of this Report.

  2. Evaluación de calidad de fuentes y recursos digitales: Guía de buenas prácticas.

    OpenAIRE

    Ayuso García, María Dolores; Martínez Navarro, Victoria

    2006-01-01

    A partir de la propuesta de un Protocolo de actuación para la evaluación de fuentes de información digitales publicadas en Internet las autoras presentan en este trabajo una Guía de Buenas Prácticas. Esta Guía esta orientada hacia los profe-sionales de la información y documentación científica y técnica, como instrumento formativo a partir del cual puede hacerse más fácil la comprensión y el análisis de los recursos publicados en Internet a los profesionales de los servicios de referencia. Un...

  3. 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.

  4. 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.

  5. Anharmonic phonons and magnons in BiFeO3

    International Nuclear Information System (INIS)

    The phonon density of states (DOS) and magnetic excitation spectrum of polycrystalline BiFeO3 were measured for temperatures 200 < T < 750K, using inelastic neutron scattering (INS). Our results indicate that the magnetic spectrum of BiFeO3 closely resembles that of similar Fe perovskites, such as LaFeO3, despite the cycloid modulation in BiFeO3. We do not find any evidence for a spin gap. A strong T-dependence of the phonon DOS was found, with a marked broadening of the whole spectrum, providing evidence of strong anharmonicity. This anharmonicity is corroborated by large amplitude motions of Bi and O ions observed with neutron diffraction. These results highlight the importance of spin-phonon coupling in this material.

  6. Anharmonic phonons and magnons in BiFeO3

    Energy Technology Data Exchange (ETDEWEB)

    Delaire, Olivier A [ORNL; Ma, Jie [ORNL; Stone, Matthew B [ORNL; Huq, Ashfia [ORNL; Gout, Delphine J [ORNL; Brown, Craig [National Institute of Standards and Technology (NIST); Wang, Kefeng [Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing; Ren, Zhifeng [Boston College, Chestnut Hill

    2012-01-01

    The phonon density of states (DOS) and magnetic excitation spectrum of polycrystalline BiFeO3 were measured for temperatures 200 < T < 750K , using inelastic neutron scattering (INS). Our results indicate that the magnetic spectrum of BiFeO3 closely resembles that of similar Fe perovskites, such as LaFeO3, despite the cycloid modulation in BiFeO3. We do not find any evidence for a spin gap. A strong T-dependence of the phonon DOS was found, with a marked broadening of the whole spectrum, providing evidence of strong anharmonicity. This anharmonicity is corroborated by large amplitude motions of Bi and O ions observed with neutron diffraction. These results highlight the importance of spin-phonon coupling in this material.

  7. 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...

  8. Analysis of optical and magnetooptical spectra of Fe5Si3 and Fe3Si magnetic silicides using spectral magnetoellipsometry

    International Nuclear Information System (INIS)

    The optical, magnetooptical, and magnetic properties of polycrystalline (Fe5Si3/SiO2/Si(100)) and epitaxial Fe3Si/Si(111) films are investigated by spectral magnetoellipsometry. The dispersion of the complex refractive index of Fe5Si3 is measured using multiangle spectral ellipsometry in the range of 250–1000 nm. The dispersion of complex Voigt magnetooptical parameters Q is determined for Fe5Si3 and Fe3Si in the range of 1.6–4.9 eV. The spectral dependence of magnetic circular dichroism for both silicides has revealed a series of resonance peaks. The energies of the detected peaks correspond to interband electron transitions for spin-polarized densities of electron states (DOS) calculated from first principles for bulk Fe5Si3 and Fe3Si crystals

  9. 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

  10. 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.

  11. 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.

  12. 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.

  13. Dos problemas de sintaxis adverbial

    Directory of Open Access Journals (Sweden)

    Claudia Chuaqui Farrú

    2006-06-01

    Full Text Available El presente trabajo trata de dos problemas de sintaxis adverbial, a saber, de los adverbios como adyacentes de sustantivos y de la función sintáctica de los adverbios "más" y "menos" en adiciones y sustracciones matemáticas. (This article tackles two problems of adverbial function, i.e., adverbs as noun modifiers and the syntactic function of the adverbs "más" and "menos" in mathematicaladditions and substractions.

  14. 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.

  15. 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...

  16. 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

  17. 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...

  18. 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.

  19. 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

  20. 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.

  1. 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

  2. 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)

  3. 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...

  4. 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.

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

    International Nuclear Information System (INIS)

    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 (Fe1) increases to about 14.3% while of the other site (Fe2) 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

  6. 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.

  7. 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

    OpenAIRE

    Alberto Etiennot; Augusto Piazza

    2010-01-01

    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 agroquímico...

  8. 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...

  9. 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...

  10. 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...

  11. 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

  12. 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...

  13. La inclusión en instituciones iberoamericanas de educación superior : buenas prácticas para el acceso y la permanencia de estudiantes con discapacidad

    OpenAIRE

    Fernández de Álava, Miren; Barrera Corominas, Aleix; Diaz Vicario, Anna

    2013-01-01

    El reconocimiento del derecho y del acceso a la educación de todas las personas con discapacidad, sin ningún tipo de discriminación y en igualdad de oportunidades y de trato, supone un avance hacia la instauración de un sistema educativo inclusivo. Al respecto, este artículo persigue un doble objetivo: por un lado, la identificación de estrategias para el acceso y la permanencia de estudiantes con discapacidad en educación superior, y por el otro, la presentación de buenas prácticas en el ámb...

  14. Perfil dos idosos que cochilam

    Directory of Open Access Journals (Sweden)

    Ariene Angelini dos Santos

    2013-12-01

    Full Text Available Esse estudo objetivou caracterizar os idosos que cochilam segundo as características sociodemográficas e de fragilidade. Estudo descritivo, transversal, recorte do projeto multicêntrico Fragilidade em Idosos Brasileiros. Foram avaliados 1.866 idosos utilizando-se questionário sociodemográfico. A fragilidade foi avaliada usando o fenótipo proposto por Fried. Os dados foram tratados com estatística descritiva. Os resultados apontaram que o perfil do idoso que cochila foi constituído predominantemente por mulheres, casadas, aposentadas, pré-frágeis, com média de idade de 73 anos, quatro anos de estudo, renda familiar mensal de 3,9 salários mínimos, com 4,4 filhos e que residiam apenas com eles. Os idosos relataram cochilar em média 5,9 dias por semana, com duração de 53,5 minutos por cochilo. Conhecer o perfil do idoso que cochila contribui para os profissionais de saúde desenvolverem ações em relação aos problemas de sono dos idosos frágeis/pré-frágeis, prevenindo, minimizando ou resolvendo esses problemas.

  15. 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

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

    OpenAIRE

    Williams, Wendol A.; Potenza, Marc N.

    2008-01-01

    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-clí...

  17. 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

  18. ¿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 ...

  19. 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

  20. Os organismos geneticamente modificados e a rotulagem dos alimentos - uma análise a partir dos direitos dos consumidores

    Directory of Open Access Journals (Sweden)

    Marcello Vitor Rocha Cota

    2015-11-01

    Full Text Available Ao longo do presente trabalho serão analisados os organismos geneticamente modificados (OGMs frente aos riscos à saúde alimentar e ao meio ambiente, sobretudo o princípio da precaução e a rotulagem dos produtos. A partir de uma dimensão comparativa de três realidades distintas, isto é, a estadunidense, a europeia, com ênfase mercado ao português, e a brasileira – sob um prisma ambiental, a rotulagem dos produtos será confrontada com os direitos dos consumidores, embora em determinadas ocasiões, diante da inexistência de informações adequadas e claras dos produtos, que estão sendo ofertados e consumidos, os consumidores não sabem o que estão consumindo.

  1. 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

  2. Electronic properties of excess Cr at Fe site in FeCr0.02Se alloy

    International Nuclear Information System (INIS)

    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, FeCr0.02Se. 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 FeCr0.02Se alloy in terms of density of states (DOS) and Fermi surfaces. The local density approximation (LDA) is used in terms of exchange correlation potential

  3. 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.

  4. 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.

  5. {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.

  6. 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.

  7. 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.

  8. 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...

  9. Uso de voriconazol en el período neonatal. Reporte de dos casos = Voriconazole use during the neonatal period. Report of two cases

    Directory of Open Access Journals (Sweden)

    Carvajal Kalil, Luis Fernando

    2011-06-01

    Full Text Available Las infecciones micóticas son cada vez más frecuentes en las unidades de cuidado intensivo y aumentan la tasas de morbilidad y mortalidad. En años recientes se han desarrollado nuevos antimicóticos, entre ellos el voriconazol que es, en el momento actual, el tratamiento de elección para los casos de aspergilosis en pacientes adultos y niños mayores de dos años y se considera una opción terapeútica en otras infecciones micóticas. A pesar de esto, la experiencia de su uso en neonatos es escasa y aún se desconocen el perfil de seguridad y las variaciones en cuanto a farmacodinámica y farmacocinética en este grupo etario. Se presentan los casos de dos neonatos de sexo masculino con infecciones micóticas (Aspergillus y Rhodotorula que fueron tratados con voriconazol con buena tolerancia y respuesta clínica adecuada

  10. 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

  11. Physical Properties of Intermetallic FE2VA1

    Energy Technology Data Exchange (ETDEWEB)

    Ye Feng

    2002-05-30

    Fe{sub 2}VAl 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 Fe{sub 2}VAl. 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 Fe{sub 2}VAl 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 Fe{sub 2}VAl, 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 Fe{sub 2}VAl.

  12. 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

  13. 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...

  14. 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.

  15. 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

  16. 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...

  17. 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

  18. O “paradoxo dos fumadores” revisitado.

    OpenAIRE

    A Gaspar; Nabais, S; Torres, M.; S. Rocha; Brandão, A; Azevedo, P; Álvares-Pereira, M; Correia, A

    2008-01-01

    Introdução: O termo “paradoxo dos fumadores” surgiu na sequência de vários estudos que descreveram uma menor mortalidade a curto prazo nos doentes com história de tabagismo, internados com Síndrome Coronário Agudo (SCA). No entanto, trabalhos mais recentes têm contestado a existência deste fenómeno. Objectivo: Avaliar a ocorrência do “paradoxo dos fumadores” na nossa população de doentes internados por SCA. Métodos: Foram analisados 1228 doentes admitidos consecutivamente por SCA de Jan...

  19. 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...

  20. 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...

  1. Eficiência dos Ésteres de Fitoesteróis Alimentares na Redução dos Lípides Plasmáticos em Hipercolesterolêmicos Moderados

    OpenAIRE

    Lottenberg Ana M. P.; Nunes Valéria S; Nakandakare Edna R; Neves Mônica; Bernik Márcia; Santos José E.; Quintão Eder C. R.

    2002-01-01

    OBJETIVO - Avaliar o efeito dos ésteres de fitoesteróis (FE) da dieta, em função dos diferentes genótipos de apo E, sobre os lípides plasmáticos em indivíduos moderadamente hipercolesterolêmicos. MÉTODOS - Pacientes moderadamente hipercolesterolêmicos (20 a 60 anos de idade; 50 mulheres e 10 homens), mantidos em dieta habitual, receberam margarina (20g/dia) enriquecida com fitoesteróis (2,8g/dia=1,68g de FE), ou margarina normal (placebo), por dois períodos de quatro semanas cada, em estudo d...

  2. 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

  3. 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.

  4. 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.

  5. 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.

  6. Interplay of Chemical Bonding and Magnetism in Fe_4N, Fe_3N, Fe_2N

    OpenAIRE

    Sifkovits, M.; Smolinski, H.; Hellwig, S; Weber, W.

    1998-01-01

    Using spin density functional theory we have carried out a comparative study of chemical bonding and magnetism in Fe_4N, Fe_3N and Fe_2N. All of these compounds form close packed Fe lattices, while N occupies octahedral interstitial positions. High spin fcc Fe and hypothetical FeN with rock salt structure have been included in our study as reference systems. We find strong, covalent Fe-N bonds as a result of a substantial \\sigma-type p-d hybridisation, with some charge transfer to N. Those Fe...

  7. 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...

  8. Magnetoresistance in Fe/ZnSe/Fe planar junctions

    International Nuclear Information System (INIS)

    We report on the magnetoresistance measurements in Fe/ZnSe/Fe planar junctions. Fe/ZnSe/Fe structures were successfully grown by molecular beam epitaxy and subsequently patterned using optical lithography. At low temperature, the tunneling of electrons from one Fe layer to the other through ZnSe gives arise a small tunneling magnetoresistance (100%) with an almost quadratic field dependence was observed for field as high as 80 kOe

  9. Fe (Plasma Iron Turnover)

    OpenAIRE

    Montanaro, Zac Kime

    2011-01-01

    Fe (Plasma Iron Turnover) is a work, or compilation of interrelating works, endeavoring to generate a custom strategy for conducting experimental information exploration. Beginning with a single event in world news, the explosion of a gas plant in Western Australia in June of 2008, Fe (Plasma Iron Turnover) teases out the physical, contextual, and subtextual cues of the story to develop and articulate a methodology for discovering related events, both backwards and forwards in history, and fo...

  10. 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

  11. Estudo do perfil dos turistas luxemburgueses

    OpenAIRE

    Leal, Kelen

    2012-01-01

    Perante a atual evolução dos mercados turísticos e a mudança no comportamento do turista, torna-se fundamental conhecer profundamente as necessidades, as motivações e as preferências dos consumidores-turistas, de modo a obter uma eficaz capacidade de resposta às necessidades e preferências da procura. Com o aumento da competitividade entre os destinos turísticos surgem mais desafios às empresas, não só as que estão ligadas ao setor como as que estão relacionadas ao próprio destino, o que l...

  12. 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...

  13. 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 ...

  14. 59Fe(n,g)60Fe and 60Fe(n,g)61Fe Reaction Rates from Local Systematics

    Energy Technology Data Exchange (ETDEWEB)

    Kelley, K; Hoffman, R D; Drake, M

    2005-04-25

    We present modeled neutron capture cross sections relevant to stellar production of {sup 60}Fe. Systematics for the input parameters required by the Hauser-Feshbach statistical model are developed based on measured data in the local region of the isotopic plane (20 {le} Z {le} 29, 43 {le} A {le} 65). These parameters and used to calculate reaction cross sections and rates for select target isotopes. Modeled cross sections are compared to experimental data where available. The {sup 59}Fe(n,{gamma}){sup 60}Fe and {sup 60}Fe(n, {gamma}){sup 61}Fe rates are compared to previous calculations. A brief discussion of errors related to the modeling is provided. We conclude by investigating the sensitivity of stellar production of {sup 26}Al and {sup 60}Fe to the {sup 59}Fe(n,{gamma}){sup 60}Fe and {sup 60}Fe(n,{gamma})61Fe reaction rates using a single zone model.

  15. 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.

  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. Dos museos en México

    Directory of Open Access Journals (Sweden)

    Ramírez Vázquez, P.

    1967-03-01

    Full Text Available 1. Modem Art Museum, at México City This consists of two buildings, the Art Museum and the Art Gallery. The first has two floor levels and contains six circular halls for exhibitions, linked together by common utilities (public, administrative and maintenance offices, and by a large vestibule, which is also round and extends up to the second floor. The art gallery also has two floors, and has a circular exhibition hall on the second floor, and various services in the lower floor. A central vestibule connects both floors and the exterior. The formal expressivity of both blocks and the surrounding site are highly impressive because of their harmony and plasticity. 2. Ciudad Juárez Museum This museum has a central block, of circular base, which is occupied with four exhibition halls, and a second block, concentric with the first one, which also contains a number of exhibition rooms. The fortunate arrangement of volumes, their shape and texture, and their emplacement in the centre of a lake, make this an especially attractive building.1. Museo de arte Moderno, en la Ciudad de México El conjunto construido consta de dos edificios: el Museo de Arte y la Galería de Arte. El primero se ha resuelto en dos plantas, y alberga: seis salas circulares para exposiciones, unidas entre sí por los servicios comunes (públicos, administrativos y de entretenimiento, y un gran vestíbulo, también circular, de doble altura. El segundo se ha organizado asimismo en dos niveles, y consta de una sala circular para exposiciones en planta alta y servicios en planta baja, ligando ambas zonas por medio de un vestíbulo central, que los comunica al exterior. La expresividad formal de los dos cuerpos construidos y el paraje elegido para emplazarlos constituyen un acierto plástico y de ambientación. 2. Museo en Ciudad Juárez Comprende este edificio: un cuerpo central, de planta circular, que alberga: cuatro salas de exposiciones; y otro, concéntrico con el anterior

  19. 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.

  20. 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.

  1. As religiões dos brasileiros

    Directory of Open Access Journals (Sweden)

    Pierre Sanchis

    2009-05-01

    Full Text Available Há dois movimentos simultâneos no campo religioso brasileiro: um primeiro de distinção, multiplicação e rupturas; um segundo de relativa homogeneização.  No campo cristão, o fenômeno mais visível é o da entrada maciça dos pentecostais, não só na arena religiosa em geral, mas nos seus pontos de alta visibilidade, especialmente populares. O significado da preferência dos pobres e do aparente trânsito do catolicismo ao pentecostalismo tende a representar o trânsito entre duas culturas: a tradicional católica afro-brasileira, e a cultura moderna de escolha individual.  A Nova Era, por exemplo, representa ao mesmo tempo a contudente negação de uma modernidade individualista, racional e dessacralizadora, a tentativa de recapitular, no que tem de global, espiritual, carnal e cósmico, o caminhar do homem para uma completude nunca atingida, porque nunca concluída.  Assim, o meio religioso brasileiro, sobretudo popular, mas não exclusivamente, vive num certo clima espiritualista que parece compartilhado por várias mentalidades no Brasil. Pode-se então levantar a seguinte questão: como escapar, neste nosso olhar sobre as religiões dos brasileiros, de uma visão tão linearmente evolucionista, positivista na sua concepção, repressiva na sua política?

  2. 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.

  3. 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.

  4. 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.

  5. 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: ...

  6. Do capitalismo à ética dos negócios: para uma abordagem dos valores

    OpenAIRE

    Nogueira, António de Vasconcelos

    1997-01-01

    Este artigo tem por objectivo a compreensão interpretativa do capitalismo como sistema e dos seus sentidos doutrinais. No plano metodológico, a argumentação radica na consulta de fontes bibliográficas, conduzida para uma reflexão axiológica que privilegiou momentos de análise conceptual numa perspectiva diabética e hermenêutica, a par da contextualização dos assuntos, da sua actualizada e pertinência, com aportações ao caso português. Procurou-se ainda validar o essencial da tese de Weber, ev...

  7. Influência dos factores de caracterização dos portos no desempenho

    OpenAIRE

    Caldeirinha, Vítor Manuel dos Ramos

    2010-01-01

    O presente trabalho de investigação tem como objectivo determinar qual o impacto dos factores de caracterização dos portos no seu desempenho. Consistiu em explicar o desempenho do porto com base nos diversos factores o que caracterizam e a sua importância relativa. Foram utilizadas as metodologias DEA - data envelopment analysis-, análise factorial, regressão linear simples, “path analysis” e SEM – structural equation model. A amostra de 43 portos europeus foi recolhida através de inquéritos ...

  8. 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.

  9. 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. ...

  10. Diffusion of Nb in Fe and in some Fe alloys

    International Nuclear Information System (INIS)

    Diffusion data of microalloying elements such as Nb, V, Ti, are required when analysing the transformation and recrystallization behaviour of HSLA steels in order to optimize grain refinement and precipitation hardening. The diffusion behaviour of Nb in pure Fe, Fe 1.5 Mn, Fe 0.6 Si and Fe 1.5 Mn 0.6 Si has been measured between 1080 and 12000C. Results indicate that Si increases Nb diffusivity while Mn decreases it. The sequence of diffusion coeficients values is: D sup(Nb) sub(Fe 1.5 Mn) < D sup(Nb) sub(Fe 1.5 Mn 0.6 Si) < D sup(Nb) sub(Fe puro) < D sup(Nb) sub(Fe 0.6 Si). Changes in diffusivity at low temperature probably due to grain boundary diffusion are also discussed. (Author)

  11. 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.

  12. 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.

  13. Superconductivity in Fe-chalcogenides

    International Nuclear Information System (INIS)

    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 Tcs 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

  14. Chalcogen height dependence of magnetism and Fermiology in FeTexSe1−x

    International Nuclear Information System (INIS)

    The FeTexSe1−x (x = 0, 0.25, 0.50, 0.75 and 1) system has been studied using density functional theory. Our results show that for FeSe, the local density approximation (LDA) seems a better approximation in terms of magnitude of magnetic energy whereas the generalized gradient approximation (GGA) greatly overestimates it. On the other hand for FeTe, GGA is a better approximation that gives the experimentally observed magnetic state. It has been shown that the height of chalcogen atoms above Fe layers has a significant effect on band structure, electronic density of states (DOS) at the Fermi level N(EF) and Fermi surfaces. For FeSe the value of N(EF) is small so as to satisfy Stoner criteria for ferromagnetism, (I × N(EF) ≥ 1) whereas for FeTe, since the value of N(EF) is large, the same is close to being satisfied. Force minimization for FeTexSe1−x using the supercell approach shows that in a disordered system Se and Te do not share the same site and have two distinct z co-ordinates. This has a small effect on magnetic energy but no significant difference in band structure and DOS near EF when calculated using either the relaxed or average value of z for chalcogen atoms. Thus substitution of Se at the Te site decreases the average value of chalcogen height above Fe layers, which in turn affects the magnetism and Fermiology in the system. By using the coherent potential approximation for the disordered system, we found that height of chalcogen atoms above the Fe layer, rather than chalcogen species or disorder in the anion planes, affects the magnetism and shape of Fermi surfaces (FSs), thus significantly altering nesting conditions, which govern antiferromagnetic spin fluctuations in the system. (paper)

  15. 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.

  16. 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.

  17. 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

  18. 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.

  19. 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.

  20. 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.

  1. Adaptation of GAMANAL to MS-DOS

    International Nuclear Information System (INIS)

    The public domain gamma spectrum analysis programme GAMANAL was adapted for use with personal computers running with MS-DOS or equivalent operating system. The original command structure of GAMANAL, and its algorithms were kept unchanged; the facilities to read spectra from different multichannel analyzer formats were added. In the completed PC version, GAMANAL runs in a batch mode, without graphics presentation or menu-oriented interaction with the operator. The operation and performance of the PC version of GAMANAL was compared with some commercial software, in respect to peak sensitivity, multiplet resolution, and accuracy of area determination. The study indicates that the GAMANAL analysis yields results as good or better than other programmes. 4 refs

  2. 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 ...

  3. 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

  4. 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.

  5. 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.

  6. 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...

  7. Hábitos saludables, igual buena salud

    OpenAIRE

    López, María Fernanda

    2011-01-01

    El presente trabajo es un proyecto desarrollado en el Jardín de Infantes N 904 de Ensenada durante el ciclo lectivo 2010 con el propósito de promover hábitos saludables desde el ámbito educativo en niños de nivel inicial desde el área de la educación física teniendo en cuenta un abordaje transversal con las demás áreas. Se realizaron distintas actividades en el Jardín y en la plaza cercana: clases en las que se trataron diferentes contenidos de promoción y prevención de la salud como hábitos ...

  8. Leibniz, Feijoo y la Buena Ciencia

    OpenAIRE

    Menéndez Viso, Armando

    2002-01-01

    En Estas Líneas Se Trata De Explorar Las Virtudes Que La Filosofía De La Cienciaactual Podría Adquirir Adoptando Un Cierto Enfoque Leibniciano, Esto Es,Poniendo El Énfasis En Lo Que Las Ciencias Representan Para Quienes No Somoscientíficos. Tales Beneficios Se Perciben Mejor Al Exponerlos Desde La Obra Dealguien Que Efectivamente Comparte La Concepción Leibniciana De La Ciencia:Benito Jerónimo Feijoo.

  9. Buenas prácticas franquicias colombianas

    OpenAIRE

    Beatriz Herrera

    2009-01-01

    Presentación que abarca información sobre la estructura organizacional de las franquicias, las condiciones de la franquiciabilidad, el proceso para la selección de firmas consultoras y las estrategias para la promoción y divulgación desarrolladas durante el programa.

  10. Estudo dos líquenes dos Açores. Parte 1 - Caldeira do Faial

    OpenAIRE

    Purvis, Ole W.; James, Peter W.

    1993-01-01

    Este trabalho, o primeiro de uma série sobre a taxonomia, ecologia e biogeografia dos líquenes dos Açores, descreve a flora de líquenes que ocorrem na cratera da Caldeira do Faial. Correspondendo a uma zonação em altitude foram reconhecidas três zonas distintas de líquenes na Caldeira. (1) Uma zona superior, entre 922-800 m, pobre em líquenes e dominada por briófitos. (2) Uma zona média, entre 800-600 m, relativamente rica em espécies e com uma fácies distintiva de Lobarion. (3) Uma zona infe...

  11. 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.

  12. 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...

  13. 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

  14. Reclamações dos utentes : estudo dos resultados e medidas correctivas no contexto dos Agrupamentos de Centros de Saúde de Lisboa e Vale do Tejo

    OpenAIRE

    Moçozinho, Pedro Morgado

    2015-01-01

    RESUMO - A qualidade dos cuidados de saúde, evolui ao longo dos tempos e é agora considerada um direito e um pilar fundamental nos serviços de saúde. As reclamações dos utentes podem revelar informação acerca das experiências entre os utentes e as organizações de saúde. Desta forma as reclamações podem ser consideradas como indicadores de qualidade que permitem identificar áreas e/ou oportunidades de melhoria, e de grande representatividade no processo da melhoria contínua da qualidade na saú...

  15. 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.

  16. 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...

  17. 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 ...

  18. 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.

  19. O EQUIVALENTE EM CARBONATO DE CÁLCIO DOS CORRETIVOS DA ACIDEZ DOS SOLOS

    Directory of Open Access Journals (Sweden)

    J.C. ALCARDE

    1996-05-01

    Full Text Available Os corretivos da acidez dos solos podem ter dois equivalentes em carbonato de cálcio: um, calculado pelos teores de cálcio e magnésio utilizando a expressão: % CaO x 1,79 + % MgO x 2,48 = %ECaCO3; outro, determinado analiticamente pelo poder ou valor de neutralização. Para uma mesma amostra ambos os valores deveriam coincidir, o que raramente acontece. Diversas hipóteses foram levantadas para justificar essa diferença. Os resultados deste trabalho permitiram inferir que nem todo o cálcio e magnésio dos corretivos devem estar associados às bases quimicamente efetivas mas também a fosfato, sulfato ou outras bases de forças inexpressivas; também os constituintes neutralizantes podem estar aprisionados em cristais de outros componentes dos corretivos, como sílica por exemplo, que só são atingidos por um ataque mais enérgico da amostra. Como conclusão, a avaliação química atual dos corretivos da acidez dos solos pode não estar se compatibilizando com o comportamento agrícola desses produtos.Agricultural liming materials can have two calcium carbonate equivalents: one calculated in function of calcium and magnesium oxide percentages, by the expression: % CaO x 1,79 + % MgO x 2,48 = %ECaCO3; and the other determined analytically by the neutralization power or value. For one sample, both values should be similar, however, this rarely occurs. Several hypoteses were raised to justify the difference. Results of this research permit to infer that not all calcium and magnesium should be associated to the chemically effective bases, but they are also associated to phosphate, sulphate or other bases of inexpressive strength. It is also possible that, the neutralizing components could be captured inside cristals, like silica for example, which react only after a strong solubilization of the sample. It is concluded that the chemical evaluation of agricultural liming materials at the present time cannot explain the agronomical behaviour of

  20. Ojos y oídos en "El hereje": Símbolos narrativos y espejos de la escritura de Delibes

    OpenAIRE

    Sara Ortega-Sierra

    2013-01-01

    El hereje narra la pseudobiografía de un artesano, Cipriano Salcedo, a la vez que integra un segundo relato de la trayectoria espiritual del personaje desde su conversión al luteranismo hasta su muerte en el auto de fe de 1559. Ahora bien, ambos relatos se configuran según la preeminencia alternativa de dos órganos perceptivos, el oído y del ojo, que, por sus cualidades intrínsecas, se convierten en símbolos narrativos –una estructura polisémica que legitima su desciframiento metódico en est...

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. Dos escuelas en Daly City (California

    Directory of Open Access Journals (Sweden)

    Ciampi, Mario J.

    1965-10-01

    Full Text Available The «Vista Grande» School includes a kindergarten, children's school, six school rooms for various levels of secondary instruction, and other facilities. The «Fernando Rivera» School has 12 schoolrooms, a children's classroom, a library, administrative offices, and a zone for a variety of other uses. Both buildings have been well designed. Space and light, the contrasts of volumes, and the power of colouring have been successfully handled.La Escuela «Vista Grande» se compone de: jardín de la infancia, clase para párvulos, seis aulas para los distintos grados, una zona para la administración, dependencias auxiliares, etc. La Escuela «Fernando Rivera» consta de: doce aulas, una clase para párvulos, biblioteca, dependencias para la administración, una zona para múltiples usos, etc. En los dos edificios, el espacio y la luz, la dinámica de la forma y la energía del color han sido acertadamente empleados.

  6. 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.

  7. [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

  8. The effect of disorder on electronic and magnetic properties of quaternary Heusler alloy CoFeMnSi with LiMgPbSb-type structure

    International Nuclear Information System (INIS)

    Thin films based on Heusler alloy often lost their theoretical predicted ultra-high spin polarization owing to the appearance of disorder. Using the first-principles calculations within density functional theory (DFT), we investigate the effect of disorder including antisite and swap on electronic and magnetic properties of quaternary Heusler alloy CoFeMnSi with LiMgPbSb-type structure. Twelve kinds of antisites and six kinds of swap disorders are proposed and studied comprehensively. In our calculations, Co(Fe)-, Mn(Fe)-, Si(Mn)-antisite and Co–Fe swap disorders are most favorable due to their lowest formation energies. Moreover, the positive binding energies of Co–Fe, Co–Si, Fe–Si and Mn–Si swap disorders with respect to their corresponding antisite disorders indicate that these complex swap disorders are more stable compared with their corresponding isolated antisite disorders. The investigations on density of states (DOS) show that the spin down energy gap of disordered structures suffers contraction and their DOS entirely move towards lower zone. Besides, the 100% spin polarization is maintained in all structures with antisite and swap disorders except for those with Co(Mn)-, Co(Si)-antisite and Co–Mn, Co–Si swap disorders. Therefore, the half-metallicity of quaternary Heusler alloy CoFeMnSi is quite robust against interfering effects such as Si(Mn), Co(Fe) and Co–Fe disorders most possibly formed in the growth. - Highlights: • CoFeMnSi with LiMgPbSb-type structure is found to be a half-metallic ferromagnet. • Si(Mn), Co(Fe), Mn(Fe) antisites and Co–Fe swap disorders are most likely to form. • The half-metallicity of CoFeMnSi is robust against the most possible disorders. • The magnetic moments of the most possible disorders follow the Pauli-Slater rule

  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. 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

  11. 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.

  12. 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.

  13. 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 of the...

  14. 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

  15. 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...

  16. 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...

  17. 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 ...

  18. 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

  19. 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. ...

  20. 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.

  1. 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

  2. Resist DoS attacks in UMTS-WLAN

    Science.gov (United States)

    Qu, Huyu; Cheng, Qiang

    2005-06-01

    Wireless network is more vulnerable to denial of service (DoS) attacks than wired one. In this paper we propose two methods to resist DoS attacks in UMTS-WLAN network, one is active and the other is passive. These two are complementary to each other. In active DoS defense method, a mobile terminal generates an authorized anonymous ID (AAI) using its true ID such as IP address, MAC address, PIN code, or asymmetric key, and substitutes its true ID with the authorized anonymous ID. The mobile terminal may be authenticated by the UMTS-WLAN, however its true ID is anonymous to intending attackers. This method can be used to isolate de-authenticating/disassociating DoS attackers, spoofing power-save DoS attacker, etc. In passive DoS defense method, we propose a trace back scheme. We use covert channels in the header of mobile IP packets to trace back the malicious nodes by embedding some address information of intermediate nodes, and recovering the embedded information by the victim. After the victim successfully traces the attacking paths from malicious nodes, it can segregate the malicious nodes and protect itself. This method can be used to resist DoS attacks of mass-produced junk message congestions.

  3. Incorporación de los principios de buenas prácticas en las empresas : Desarrollo de una política de turismo responsable para el sector de cabañas de la ciudad de Olavarría

    OpenAIRE

    Melchiorre, Cristian Ariel

    2009-01-01

    La implementación de principios sustentables en el sector de “cabañas” de la ciudad de Olavarría, como lo es un “Programa de Recomendaciones de Buenas Prácticas”, le permitirá a las empresas mejorar sus operaciones diarias a partir de ciertas acciones que suponen reales contribuciones para lograr un desarrollo turístico sustentable del destino, que involucren el crecimiento económico, el bienestar social y la conservación de la naturaleza y la cultura local.

  4. 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...

  5. 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

  6. 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....

  7. 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...

  8. 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...

  9. Aspectos acústicos do comportamento dos golfinhos

    OpenAIRE

    Santos, Manuel Eduardo dos

    1989-01-01

    Este artigo pretende apresentar uma recolha bibliográfica de alguns dados e hipóteses relativos a adaptações sensoriais e comunicativas dos cetáceos, particularmente dos golfinhos. São consideradas as suas capacidades perceptivas e as potencialidades dos canais de comunicação de que dispõem, sendo realçada a sua considerável especialização na utilização do canal acústico. Depois de uma breve referência às suas capacidades auditivas concretas e às teorias explicativa...

  10. 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.

  11. 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.

  12. 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

  13. 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

  14. 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...

  15. 57Fe NMR study of nitrided Ce2 Fe17

    International Nuclear Information System (INIS)

    The 57 Fe NMR of Ce2 Fe17 Nx (x=0-1.5) was measured in the ordered magnetic state at 4.2 K. For x = 0, resonances coming from all Fe sites have been identified in the 30 - 45 MHz range. With nitrogenation, new lines appear in the range 37 - 54 MHz. Every nitrogenated sample shows three sets of lines, arising from regions where Ce atoms have 0, 2, and 3 nitrogen atoms as near neighbors. (author). 5 refs., 1 fig

  16. 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.

  17. 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

  18. 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

  19. Prevención de la violencia de género en las universidades: Características de las buenas prácticas dialógicas

    OpenAIRE

    Mendoza Morteo, Marlen

    2011-01-01

    [spa] La tesis analiza el problema de la violencia de género al interior de las universidades. El estudio se compone de dos grandes dimensiones: 1) el análisis de la presencia del fenómeno en diferentes grupos poblacionales: académicas, estudiantes y trabajadoras o miembros del personal de servicios; y 2) el estudio de las prácticas y estrategias que pueden contribuir a su prevención y superación del ambiente universitario. La primera parte corresponde a la dimensión metodológica y los a...

  20. 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

  1. OptaDOS - a new tool for EELS calculations

    International Nuclear Information System (INIS)

    Many modern (Scanning) Transmission Electron Microscopes ((S)TEMs) are equipped with an energy loss spectrometer. The Electron Energy Loss (EEL) spectra collected provide an experimental method of probing the bonding within a material. With the extra addition of monochromators, the energy resolution obtainable means that even more information is revealed within the fine structure of the spectra. Interpreting the fine structure can often be aided by simulation. Density-functional theory (DFT) is one method of simulating EEL spectra. DFT allows us to simulate DOS and EEL spectra from different structures. This comparison between simulation and experiment enables us to explore how changes in the spectrum are related to changes within the sample. CASTEP is a pseudopotential DFT code which can simulate both low-loss and core-loss EEL spectra. Recent developments have resulted in a separate analysis tool, OptaDOS. This package computes various spectral properties including DOS, projected DOS, joint DOS, core-loss and low-loss EEL spectra and optical spectra. One of the important aspects of the code is the way in which the DOS is calculated. This is done via linear extrapolation or adaptive smearing, methods which are not currently available within CASTEP (or indeed any other code) and which allow detailed analysis of spectral properties. This paper summarises these developments and what they mean for the interpretation of EEL spectra.

  2. CARTOGRAFIA DOS IMPACTOS AMBIENTAIS NO PARQUE NACIONAL DA CHAPADA DOS VEADEIROS (GO

    Directory of Open Access Journals (Sweden)

    Carlos Shiley Domiciano

    2012-01-01

    Full Text Available The main objective of this study is to show, through cartographic studies, the environmental impacts of the tourism at Chapada dos Veadeiros National Park in São Jorge District, Alto Paraíso City-Goiás and outskirts. Also to verify the tourists perception, the public functionaries perception and local community perception of this impacts. The André Journaux methology of synthesis maps was used for to elaborate one Landscape Unity Map, where the environmental impacts was registered. The autors observed the impacts and interviewed tourists, residents, local administrators and national park administrators. Was evidenced that impacts mark the local landscape, reflecting the social practices of the place.

  3. Exchange coupling and magnetic anisotropy at Fe/FePt interfaces

    Science.gov (United States)

    Aas, C. J.; Hasnip, P. J.; Cuadrado, R.; Plotnikova, E. M.; Szunyogh, L.; Udvardi, L.; Chantrell, R. W.

    2013-11-01

    We perform fully relativistic first-principles calculations of the exchange interactions and the magnetocrystalline anisotropy energy (MAE) in an Fe/FePt/Fe sandwich system in order to elucidate how the presence of Fe/FePt (soft/hard magnetic) interfaces impacts on the magnetic properties of Fe/FePt/Fe multilayers. Throughout our study we make comparisons between a geometrically unrelaxed system and a geometrically relaxed system. We observe that the Fe layer at the Fe/FePt interface plays a crucial role inasmuch as its (isotropic) exchange coupling to the soft (Fe) phase of the system is substantially reduced. Moreover, this interfacial Fe layer has a substantial impact on the MAE of the system. We show that the MAE of the FePt slab, including the contribution from the Fe/FePt interface, is dominated by anisotropic intersite exchange interactions. Our calculations indicate that the change in the MAE of the FePt slab with respect to the corresponding bulk value is negative, i.e., the presence of Fe/FePt interfaces appears to reduce the perpendicular MAE of the Fe/FePt/Fe system. However, for the relaxed system, this reduction is marginal. It is also shown that the relaxed system exhibits a reduced interfacial exchange. Using a simple linear chain model, we demonstrate that the reduced exchange leads to a discontinuity in the magnetization structure at the interface.

  4. 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.

  5. Neutron Transmission Through Crystalline Fe

    Directory of Open Access Journals (Sweden)

    M. Adib

    2005-01-01

    Full Text Available The neutron transmission through crystalline Fe has been calculated for neutron energies in the range 10-4< E<10 eV using an additive formula. The formula permits calculation of the nuclear capture, thermal diffuse and Bragg scattering cross-section as a function of temperature and crystalline form. The obtained agreement between the calculated values and available experimental ones justifies the applicability of the used formula. A feasibility study on using poly-crystalline Fe as a cold neutron filter and a large Fe single crystal as a thermal one is given.

  6. 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...

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. Communities of leadership in FE

    OpenAIRE

    Collinson, M.; Collinson, D L

    2007-01-01

    This working paper highlights the significance of multiple communities as crucial conditions, processes and consequences of FE leadership. Our research suggests that in (almost) all their activities FE colleges engage communities. They make important, but frequently under-estimated contributions to the local community and economy. This is the case within colleges (e.g. students and employees), between colleges and their multiple-partners (e.g. in the local community and economy) and between d...

  14. CoFeRh alloys

    Energy Technology Data Exchange (ETDEWEB)

    Tabakovic, Ibro [Seagate Technology, Research and Development, Bloomington, MN 55435 (United States)], E-mail: ibro.m.tabakovic@seagate.com; Qiu Jiaoming; Riemer, Steve; Sun Ming; Vas' ko, Vlad; Kief, Mark [Seagate Technology, Research and Development, Bloomington, MN 55435 (United States)

    2008-01-01

    The electrochemical behavior of Rh(III) species in CoFe solution containing RhCl{sub 3}, NH{sub 4}Cl, H{sub 3}BO{sub 3}, CoSO{sub 4}, FeSO{sub 4}, saccharin, and NaLS (Na lauryl sulfate) has been investigated. The electrochemistry of Rh(III) species is influenced by each of the compounds present in CoFe plating solution, but especially by addition of saccharin and H{sub 3}BO{sub 3} to the RhCl{sub 3}-NH{sub 4}Cl solution. The nucleation and growth of Rh on GC (glassy carbon), Ru, and Cu electrodes from NH{sub 4}Cl solution was studied using the potentiostatic current-transient methods. The results support a predominantly progressive nucleation of Rh on all three-electrode surfaces. The nucleation kinetic parameters ANo (steady state nucleation rate) and Ns (saturation nuclear number density) were found to vary with potential and are electrode-dependent in order: GC > Ru{approx}Cu. The electrodeposited Rh films obtained from NH{sub 4}Cl solution and nonmagnetic CoFeRh film obtained from CoFe solution were characterized in terms of the following properties: morphology, surface roughness, crystal structure and chemical composition. The origin of light elements found in Rh and CoFeRh films (O, Cl, S, C, N) was discussed.

  15. Mielencefalite espontânea dos camundongos

    Directory of Open Access Journals (Sweden)

    Hermínio Linhares

    1944-02-01

    Full Text Available 1 — Duas amostras de vírus capazes de produzir uma mielencefalite foram isoladas de dois camundongos brancos suíços, de criação, espontâneamente infetados, em um total de 7.000 animais examinados; uma terceira amostra foi obtida por trituração e filtração dos intestinos de camundongos aparentemente normais. 2 — Foram feitas separadamente dez passagens por inoculação intra¬cerebral em camundongos jovens e adultos. Verificou-se por testes de imunidade cruzada que as três amostras eram idênticas. Prossegiu-se então nas passagens com apenas uma das amostras. 3 — O poder infetante aumenta com o número de passagens: o período médio de incubação diminui e aumenta a letalidade. 4 — A infecção espontânea e experimental é descrita. A doença parece ser mais comum em animais jovens. O período de incubação varia de 5 a 30 dias. Às vêzes observa-se uma fase prodromica: fraqueza, menor atividade, dificuldade em andar; geralmente surge a paralisia flácida sem sintomas prévios, na grande maioria das vêzes, nos membros posteriores. Três formas clínicas foram observadas: super-aguda, aguda e crônica. 5 — Em camundongos normais o vírus pode ser demonstrado nas fezes e nos intestinos. Ele é comum no tubo digestivo e só ocasionalmente invade o sistema nervoso central, ou melhor, a encefalomielite e primàriamente uma doença do trato digestivo no qual a invasão do SNC é um acidente. 6 — O vírus passa através de velas de CHAMBERLAND L3 e L5, em BER KEFED V, N e W e em filtro Seitz EK, a suspensão sendo tão ativa como antes da filtração. Conserva-se bem em glicerina a 50% pelo menos 60 dias, se guardado na geladeira. Suspensão de cérebro e medula aquecida em banho-maria a 56°C por 30 minutos perde a atividade. 7 — O título variou entre 4.000 e 20.000 dmm. 8 — Obteve-se infecção por inoculação intracerebral, por instilação nasal e, com menos regularidade, por inoculação intraperitoneal; a via g

  16. Structure and magnetic properties of Fe12X clusters

    International Nuclear Information System (INIS)

    Highlights: • A DFT-GGA approach is used. • Binary clusters Fe12X are optimized. • The considered X dopants are Al, 3d-, 4d-, and Gd atoms. • Gd and Mn do increase the total spin magnetic moment. • 4d-metal atoms form more stable clusters. - Abstract: The electronic and geometrical structures of a Fe12X family of binary clusters Fe12Al, Fe12Sc, Fe12Ti, Fe12V, Fe12Cr, Fe12Mn, Fe12Co, Fe12Ni, Fe12Cu, Fe12Zn, Fe12Y, Fe12Zr, Fe12Nb, Fe12Mo, Fe12Tc, Fe12Ru, Fe12Rh, Fe12Pd, Fe12Ag, Fe12Cd, and Fe12Gd are studied using density functional theory within generalized gradient approximation. It is found that the geometrical structures corresponding to the lowest total energy states found for the Fe12X clusters possess icosahedral shape with the substituent atom occupying the central or a surface site. The only exception presents Fe12Nb where a squeezed cage structure is the energetically most favorable. The substitution of an atom in the Fe13 cluster results in the decrease of its total spin magnetic moment of 44 μB, except for Fe12Mn and Fe12Gd. The Fe12X clusters are more stable than the parent Fe13 cluster when X = Al, Sc, Ti, V, Co, Y, Zr, Nb, Mo, Tc, Ru, and Rh

  17. 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.

  18. DISCURSO, IDENTIDADE E SUBJETIVIDADE EM O CANDIDATO DOS POBRES

    Directory of Open Access Journals (Sweden)

    WELISSON MARQUES

    2011-01-01

    Full Text Available Propomos por meio deste artigo refletir, a priori, acerca da noção de identidade advinda dos estudos sociológicos, seguindo as reflexões de Hall (2006, Bauman (2005, Silva (2007 e Woodward (2007, como também de subjetividade a partir dos estudos de Foucault (1984; 1992; 1994; 1997 2007, e pensar a pertinência destes conceitos como complementares e que coadunam com a noção de sujeito segundo a perspectiva discursiva. Apresentaremos também uma breve reflexão sobre a noção de poder em Foucault, cuja proficuidade se dá na Análise do Discurso uma vez que o poder é constitutivo dos discursos do sujeito-enunciador. Por fim, pautados nos conceitos aqui bosquejados, empreenderemos uma breve análise de um artigo intitulado O Candidato dos Pobres publicado pela revista Veja e que faz referência ao presidente Lula no contexto do escândalo do mensalão. Destarte, percebemos por meio dos recortes analisados que o sujeito enunciador se utiliza de diversas estratégias como forma de conspurcação de seu referente - o presidente Lula.

  19. 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

  20. Moessbauer Study of Electrodeposited Fe/Fe-Oxide Multilayers

    International Nuclear Information System (INIS)

    Iron has been deposited electrochemically by short current pulses in Na-saccharin containing FeII-chloride and sulphate solution electrolytes. Combined electrochemical techniques with initial pulse plating of iron nanolayer and its subsequent anodic oxidation under potential control have been used for production of Fe/Fe-oxide multilayers. 57Fe CEM spectra of pulse plated iron revealed the presence of a minor doublet attributed mainly to γ-FeOOH in addition to the dominant sextet of α-iron. In the case of anodically oxidized pulse plated iron and of samples after repeated deposition of anodically oxidized pulse plated iron an additional minor doublet, assigned to ferrous chloride, also appears in the Moessbauer spectra. A significant change in the magnetic anisotropy of α-iron was observed with the anodic oxidation. The thickness of the layers were estimated from the CEM spectrum data by a modified computer program of the Liljequist method. The coercive field and the power loss versus frequency data showed that the pulse plated iron cores are good inductive elements up to several kHz frequencies

  1. Igualdade na diversidade: a luta pelo reconhecimento dos direitos dos homossexuais no Brasil

    Directory of Open Access Journals (Sweden)

    Osvaldo F. R. L. Fernandez

    2011-08-01

    Full Text Available Este artigo procura refletir sobre como a sistemática discriminação e violência contra os homossexuais, o que impede o próprio incremento da cidadania no Brasil, pois torna estruturalmente sancionada a exclusão e a desigualdade social. A principal questão é demonstrar que os preceitos constitucionais e os direitos fundamentais são violados quando são negados aos LGBT o direito à vida, à dignidade e à segurança. Assim, será defendida a tese de que a proteção e a promoção dos direitos desse segmento específico da sociedade significa também um ganho geral para o exercício da cidadania.

  2. 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.

  3. 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.

  4. Reaction of FeS with Fe(III)-bearing acidic solutions

    International Nuclear Information System (INIS)

    The reaction of FeS with Fe(III)-bearing acidic solutions (Fe(III)BAS) was probed at 25 degrees C and pH between 2 and 3. Initial dissolved Fe3+ ([Fe3+](init)) was varied from 0.1 mM to 1 mM, and the length of the experiments was 240 mm. Except for the experiment at initial pH 2, total dissolved iron ([Fe](total)) decreased immediately (within 1 mm) after contact of FeS and Fe(III). Afterwards, [Fe](total) increased smoothly. A progressive increase in pH values and an Eh decrease within 240 min of reaction time were also observed. The reaction order of FeS dissolution in Fe(III)BAS with respect to [H+] is estimated to 0.65 at initial pH 3.0, and increases up to 1.0 with decreasing initial pH, indicating that [H+] is an important parameter of FeS dissolution in Fe(III)BAS. In contrast, changes in [Fe3+](init) have only a limited effect on the rate of FeS dissolution in Fe(III)BAS. Raman spectra of initial and reacted FeS samples reveal the accumulation of alpha-S-8-like material on FeS surface. These results support a mechanism of FeS dissolution in Fe(III)BAS starting with the protonation of mineral surface and Fe(aq)3+ adsorption. Adsorbed protons subsequently accelerate Fe2+ release from FeS matrix into solution. The adsorbed Fe3+ may oxidize sulfur moieties and generate insoluble species, presumably polysulfide and elemental sulfur. The subsequent migration of Fe2+ into solution is controlled by the formed sulfur rich layer. (authors)

  5. 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...

  6. 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

    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...... 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...... differently complexed Fe(III) pools were separated by addition of Na2CO3, which led to immediate precipitation of the inorganic Fe without causing significant dissociation of Fe-desferrioxamine complexes. Experiments using enriched 57Fe tracer showed that isotopic equilibration between the 57Fe...

  7. 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}

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

    International Nuclear Information System (INIS)

    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 tAFM has a critical value tC for the magnetic coupling between the Fe layers: for tAFMC the magnetization directions align perpendicularly, with zero applied field, while the alignment is collinear for thicker spacers. A phenomenological model has been developed to reproduce and discuss the results. Complementary information has been obtained by means of spin polarized low energy electron microscopy

  9. Monocephalus dipygus EN CACHARROS: REPORTE DE DOS CASOS

    Directory of Open Access Journals (Sweden)

    Teresa Oviedo S

    2008-12-01

    Full Text Available Se describen dos casos de duplicación posterior congénita en cachorros. Esta malformación también conocida como Monocephalus dipygus, hace referencia a individuos dobles, caracterizados por tener cabeza y tórax fusionados en uno solo, duplicidad simétrica de pelvis y miembros posteriores. El primer caso, presentó cuatro miembros anteriores, cuatro miembros posteriores y palatosquisis. El segundo caso, presentó dos miembros anteriores y cuatro miembros posteriores. En general, ambos casos pueden ser relacionados como gemelos fusionados simétricos.

  10. Impacto dos incentivos fiscais e parafiscais no apoio ao emprego

    OpenAIRE

    Ferreira, Licínia Isabel dos Santos

    2011-01-01

    A presente investigação tem como objectivo analisar “o impacto dos incentivos fiscais e parafiscais no apoio ao emprego”; identificar os “incentivos ficais e as isenções no âmbito do apoio às empresas” , assim como verificar os seus “reflexos na contratação de trabalhadores”. Para tal, tentou-se perceber quais as políticas e legislação que estão subjacentes a estes incentivos e de que forma se colocam em prática, fomentando a contratação dos trabalhadores. A metodologia a...

  11. 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...

  12. 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...

  13. Atlas geoquímico dos solos das bacias hidrográficos dos rios Douro e Mondego

    OpenAIRE

    Almeida, Luís Alberto Teixeira Dias de Meneses de

    2005-01-01

    Este trabalho tem como objectivos a caracterização geoquímica e a avaliação da aptidão natural dos solos das bacias hidrográficas dos rios Douro e Mondego, para o cultivo da vinha. Estes dois rios, têm uma importância socioeconómica para Portugal, por integraram duas das mais famosas regiões vitivinícolas que são respectivamente a região demarcada dos Vinhos do Porto e do Douro e a região demarcada do Dão. Estas duas bacias hidrográficas foram escolhidas, em face de duas raz...

  14. 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

  15. O campo dos economistas franceses no fim dos anos 90: lutas de fronteira, autonomia e estrutura

    Directory of Open Access Journals (Sweden)

    Frédéric Lebaron

    2001-04-01

    Full Text Available A noção de economista, longe de simples e evidente, é objeto de numerosas lutas de definição. O exemplo do campo dos economistas franceses, analisado a partir de um conjunto de entrevistas, observações de dados prosopográficos, revela certas características dessas lutas. Estas opõem detendores de formas diferenciadas de capital, que estão elas mesmas em correspondência com posições distintas no campo do poder. Nessas lutas, estão em questão ao mesmo tempo a autonomia e a estrutura desse campo científico. A fraca autonomia relativa do campo da ciência econômica se faz acompanhar de uma forte homologia entre a estrutura desse campo e aquela do campo do poder francês em seu conjunto.The concept of the economist, rather than being a simple and evident one, is the object of numerous conflicting definitions. The example of the field of French economists, as analysed in a set of interviews and the observation of prospographical data, reveal certain characteristics of these conflicts. These struggles oppose those who detain differentiated forms of capital, which are themselves in correspondence with distinct positions in the field of power. These conflicts put into question both the autonomy and the structure of this scientific field. The relatively weak autonomy of the field of economical sciences is followed by a strong homology between the structure of this field and that of the field of French power in its entirety.

  16. 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

  17. 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

  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. Radiation chemistry of higher oxidation states of iron (Fe(VI), Fe(V), and Fe(IV))

    International Nuclear Information System (INIS)

    High oxidation states of iron, Fe(VI), Fe(V), and Fe(IV) (ferrate), are involved in oxidation and hydroxylation reactions of biological, industrial, and environmental importance. Despite the proposed involvement of these oxidations states in numerous reactions, limited information is available on the fundamental properties of Fe(VI) (FeO42-), Fe(V) (FeO43-), and Fe(IV) (FeO44-) in the absence of a specialized ligand system in aqueous solution. Progress has been made in characterizing the spectral and kinetic properties of these oxidation states in aqueous solution. Both Fe(V) and Fe(IV) were generated in aqueous solution by pulse radiolysis in which Fe(VI) reduces to Fe(V) by radicals at near diffusion-controlled rates. For the last few years, we have started the studies on the ferrate reactions with nitrogen- and sulfur-containing substrates to understand the kinetics and mechanisms of the interaction of ferrate species with these substrates

  20. 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

  1. 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...

  2. Ano Internacional dos Solos 2015: Oportunidade para promover uma administração integrada dos solos em Portugal?

    OpenAIRE

    Alexandre, Carlos; Gonçalves, Conceição; Monteiro, Fernando; Ribeiro, Henrique; Ramos, Tiago

    2015-01-01

    Resumo: Neste trabalho assinala-se o retrocesso da administração do recurso solo em Portugal ao longo dos últimos 40 anos, em contraponto com a evolução recente a nível europeu (Estratégia Temática para a Protecção do Solo) e a nível global (Parceria Global para o Solo, Dia Mundial do Solo e Ano Internacional dos Solos 2015, AIS-2015). Aproveitando o impulso internacional neste domínio apresenta-se a Parceria Portuguesa para o Solo (PPS), como mais uma iniciativa que procura inverter o proces...

  3. 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...

  4. 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

  5. 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.

  6. 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...

  7. Proximity effect in Fe-Cr-V-Cr-Fe system

    International Nuclear Information System (INIS)

    The proximity effect in the Fe-Cr-V-Cr-Fe thin film layered system is studied with the purpose of determining the chromium impact on the superconductivity in the superconductor-ferromagnetic heterostructures. With the increase in the chromium layers thickness dCr by the iron layers unchanged thickness dFe one can observe in the temperature dependence of the superconducting transition Tc on dCr the maximum by dCr ∼ 40 A and thereafter sharp decrease in Tc. It is established by studying the Tc dependence on the dFe at the dCr fixed value, that the depth of the Cooper pairs penetration into the chromium layer does not exceed 40 A. The conclusion is made in the course of obtained experimental data analysis, that by the dCr ≅ 40 A there takes place the transition of the Cr layers from the nonmagnetic state to the disproportionate state of the spin-density waves

  8. 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.

  9. 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.

  10. 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.

  11. 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.

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

    International Nuclear Information System (INIS)

    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 Br and the (BH)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

  13. Eutectic transformation L ↔ Zr6Fe23 + Fe(τ) in the Fe-Zr system

    International Nuclear Information System (INIS)

    The knowledge of the phase diagram of the Fe-Zr system is important because Fe is always present as an impurity in commercial Zr-base nuclear grade alloys. This diagram has four intermetallic compounds, namely Zr3Fe, Zr2Fe, ZrFe2 and Zr6Fe23. ZrFe2 with a cubic Laves C15 structure melts congruently at 1673 deg C and Zr6Fe23 with a cubic Th6Mn23-type structure is a product of the peritectic ZrFe2 + L↔Zr6Fe23 reaction at 1482 deg C. As a part of the work on the Fe-rich portion of the system, the eutectic transformation L↔Zr6Fe23 + Fe(τ), its temperature and its composition have been studied. In order to find the eutectic temperature, sample of Zr15Fe65 and Zr4Fe96 were thermally treated at the temperature higher and lower than 1337 deg C, which was reported in the last revision of the diagram (1988). It was observed that samples treated at 1345 deg C, 1340 deg C, 1335 deg C and 1325 deg C partially melted while those treated at 1320 deg C did not. An eutectic temperature of (1325 ±5) deg C could be determined from the results of metallographic, X-ray and microanalysis experiments. The composition of the eutectic was determined to be (90±1)at % Fe, with the electron microprobe, by automatically averaging results on regions 10μm long. (Author)

  14. 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.)

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

    Science.gov (United States)

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

    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.

  16. 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

  17. A autoavaliação como instrumento de autorregulação dos progressos dos alunos

    OpenAIRE

    Marques, Rogério de Oliveira

    2015-01-01

    Este trabalho tem como objetivo promover uma reflexão sobre a importância da autoavaliação dos alunos no desencadear de mecanismos pessoais que lhes permitam adquirir hábitos de autorregulação das suas aprendizagens.

  18. MODIFICACIONES QUÍMICAS INDUCIDAS POR DOS ESPECIES DE LOMBRICES GEÓFAGAS EN SUELOS DE VERACRUZ, MÉXICO

    Directory of Open Access Journals (Sweden)

    Benito Hern\\u00E1ndez-Castellanos

    2010-01-01

    Full Text Available Dos lombrices tropicales, una exótica (Pontoscolex corethrurus y otra nativa (Glossoscolecidae sp. de Veracruz, México, fueron cultivadas en condiciones de laboratorio para colectar sus respectivos turrículos (deyecciones cada 48 horas, medir su tasa de producción y el efecto que ejercen sobre varios parámetros químicos en el suelo excretado. Ambas especies fueron cultivadas en un Lixisol (La Víbora y P. corethrurus lo fue también en otros dos tipos de suelo, un Vertisol (Plan de las Hayas y un Andosol (Los Tuxtlas. Los parámetros químicos medidos en los turrículos y en suelo testigo (control fueron los siguientes: pH, C, N, C/N, NO3, NH4, Na, K, Ca, Mg, CIC, P-asimilable, P-Total, P-Resinas, Al, Fe, Cu, Zn, Mn. Para P. corethrurus la producción de turrículos superficiales fue más alta en los suelos con menor contenido de MO. En el Lixisol, Glossoscolecidae sp. produjo menor cantidad de turrículos comparada con P. corethrurus, pero promovió una disponibilidad mayor, especialmente de K, Na Mg, Mn, Fe, K y NH4. Pontoscolex corethrurus promovió también la concentración de la mayor parte de los parámetros estudiados con respecto al suelo control, tanto en el Andosol como en el Vertisol;en el Lixisol, esta especie incrementó la concentración en la mitad de los parámetros. Pontoscolex corethrurus tiene una capacidad alta de adaptarse a diferentes suelos y de modificar sus características químicas, promoviendo la disponibilidad de diversos elementos esenciales para el crecimiento vegetal; eso es especialmente importante en los suelos más pobres como el Lixisol.

  19. 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

  20. Determination of [Fe2+]/[Fe3+]-ratios in Arfvedsonite by Mössbauer Spectroscopy

    DEFF Research Database (Denmark)

    Andersen, E. B.; Fenger, J.; Rose-Hansen, J.

    1975-01-01

    correct for a difference between the recoil-free fractions. At room temperature [Fe2+] seems detected with an efficiency of only about 85% of that of [Fe3+]. Results of [Fe2+]/[Fe3+] determinations by Mössbauer spectroscopy and by wet chemical analysis of a series of arfvedsonite samples, separated from...

  1. 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.

  2. Mass Effects on Optical Phonons in L12-Ordered Pt357Fe and Pd357Fe

    International Nuclear Information System (INIS)

    Inelastic nuclear resonant scattering spectra of 57Fe atoms were measured on Pt357Fe and Pd357Fe with the L12 crystal structure, and with the same crystallographic sites for 57Fe atoms. Phonon partial density of states curves for 57Fe were obtained from these spectra. In comparison to the non-dispersive Einstein-like optical modes in Pt357Fe, the optical modes in Pd357Fe are broader. This difference can be understood in terms of the difference in mass of Pd and Pt.

  3. Thermoelectric effects in FeCo|MgO|FeCo magnetic tunnel junctions

    OpenAIRE

    Wang, Shizhuo; Xia, Ke; Bauer, Gerrit E. W.

    2014-01-01

    We studied the thermoelectric coefficients (Seebeck and thermal conductance)of FeCo|MgO|FeCo(001) magnetic tunnel junctions (MTJs) from first principles using a generalized Landauer-B\\"{u}ttiker formalism. FeCo|MgO|FeCo(001) MTJs usually yield smaller thermoelectric effects compared with epitaxial Fe|MgO|Fe(001) MTJs. The (magneto-) Seebeck effect is sensitive to the details of the FeCo$|$MgO interfaces. Interfacial oxygen vacancies (OVs) can enhance the thermoelectric effects in MTJs greatly...

  4. 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...

  5. 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.

  6. 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.

  7. 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.

  8. 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.

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

    Science.gov (United States)

    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.

  10. 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.

  11. 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.

  12. 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...

  13. Colombia en las dos fases de globalización

    Directory of Open Access Journals (Sweden)

    Salomón Kalmanovitz

    2007-12-01

    Full Text Available Los historiadores de la globalización periodizan dos grandes fases: una de 1860 a 1914, seguida de un período de desintegración de los flujos de capital, comercio y trabajadores, y otra de 1950 al presente. Este ensayo examina el comportamiento de la economía colombiana durante las dos globalizaciones. Aunque Colombia entró tardíamente a la primera fase, tuvo un comportamiento excelente, debido quizás a que partió de un punto muy bajo en la escala del desarrollo. Sus índices de comercio internacional y de participación en los flujos de capital se elevaron intensamente hasta 1930. En la segunda, el comportamiento fue relativamente mediocre; se erigieron altas barreras al comercio y a la inversión extranjera, mientras que se reprimió al sistema financiero en favor de agentes con poder político.

  14. 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.

  15. 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.

  16. 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

  17. 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.

  18. Dos nuevos algoritmos de cifrado autenticado: Silver y CPFB

    OpenAIRE

    Montes, Alfredo Miguel; Penazzi, Daniel

    2014-01-01

    El presente trabajo resume el proceso de diseño de dos algoritmos de cifrado autenticado, Silver y CPFB, que participan en la competencia CAESAR para la selección de algoritmos de cifrado autenticado. Silver es un algoritmo de cifrado basado en AES-128, mientras que CPFB es un modo de operación. Ambos basan su seguridad en la presunción de que AES es indistinguible de un random oracle.

  19. 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.

  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. Efecto de abonos orgánicos en las propiedades químicas del suelo y el rendimiento de la mora (Rubus adenotrichus en dos zonas agroecológicas de Costa Rica

    Directory of Open Access Journals (Sweden)

    Rafael Orozco Rodríguez

    2012-05-01

    Full Text Available El objetivo de esta investigación es evaluar el efecto de dos abonos orgánicos en las propiedades quími- cas del suelo y el rendimiento de plantas de mora (Rubus adenotrichus cv.’Vino’ en dos zonas de Costa Rica. Para ello se establecieron dos experimentos, uno en Buena Vista de Pérez Zeledón (BVPZ y otro en San Mar tín de León Cor tés (SMLC, ambos en la provin- cia de San José, Costa Rica. La investigación se realizó entre agosto del 2005 y julio del 2008. Se evaluaron tres tratamientos en cada experimen- to: Compost (C y Lombricompost (L, a razón de 4 kg/planta y 3 kg/planta respectivamente, y un testi- go sin abono (T. La frecuencia de aplicación de los abonos a la siembra se dio a los 6, 12, 18 y 24 meses para un total de 6,6 t/ha para el C y 4,9 t/ha para el L. Se tomaron muestras de suelo a los 0, 6, 12, 18, 24 y 35 meses, después de la siembra para su análisis. Los resultados muestran que, en ambos agro-ecosis- temas, la aplicación del C y L incrementó el pH del suelo, redujo la acidez, incrementó la disponibilidad de Ca, Mg, K, N, y P, y favoreció la capacidad de in- tercambio catiónico efectiva (CICE y el porcentaje de materia orgánica. No se observó acumulación de Mn, Cu y Zn. En cuanto al rendimiento, en BVPZ solo se encon- traron diferencias significativas (P=0,00188 entre C (1,8 t/ha y el T (0,9 t/ha; mientras que en SMLC, no se encontraron diferencias estadísticas significativas (P

  2. Rapid degradation of dyes in water by magnetic Fe(0)/Fe3O4/graphene composites.

    Science.gov (United States)

    Chong, Shan; Zhang, Guangming; Tian, Huifang; Zhao, He

    2016-06-01

    Magnetic Fe(0)/Fe3O4/graphene has been successfully synthesized by a one-step reduction method and investigated in rapid degradation of dyes in this work. The material was characterized by N2 sorption-desorption, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), vibrating-sample magnetometer (VSM) measurements and X-ray photoelectron spectroscopy (XPS). The results indicated that Fe(0)/Fe3O4/graphene had a layered structure with Fe crystals highly dispersed in the interlayers of graphene, which could enhance the mass transfer process between Fe(0)/Fe3O4/graphene and pollutants. Fe(0)/Fe3O4/graphene exhibited ferromagnetism and could be easily separated and re-dispersed for reuse in water. Typical dyes, such as Methyl Orange, Methylene Blue and Crystal Violet, could be decolorized by Fe(0)/Fe3O4/graphene rapidly. After 20min, the decolorization efficiencies of methyl orange, methylene blue and crystal violet were 94.78%, 91.60% and 89.07%, respectively. The reaction mechanism of Fe(0)/Fe3O4/graphene with dyes mainly included adsorption and enhanced reduction by the composite. Thus, Fe(0)/Fe3O4/graphene prepared by the one-step reduction method has excellent performance in removal of dyes in water. PMID:27266311

  3. 57Fe NMR study of amorphous and rapidly quenched crystalline Fe-B alloys

    Science.gov (United States)

    Pokatilov, V. S.

    2009-01-01

    Amorphous and crystalline Fe-B alloys (5-25 at % B) were studied using pulsed 57Fe nuclear magneticr esonance at 4.2 K. The alloy samples were prepared from a mixture of the 57Fe and 10B isotopes by rapid quenching from the melt. In the microcrystalline Fe-(5-12 at %) B alloys, the resonance frequencies were measured for local states of 57Fe nuclei in the tetragonal and orthorhombic Fe3B phases and also in α-Fe. The resonance frequencies characteristic of 57Fe nuclei in α-Fe crystallites with substitutional impurity boron atoms in the nearest neighborhood were also revealed. In the resonance frequency distribution P( f) in the amorphous Fe-(18-25) at % B alloys, there are frequencies corresponding to local Fe atom states with short-range order of the tetragonal and orthorhombic Fe3B phases. As the boron content decreases below 18 at %, the P( f) distributions are shifted to higher frequencies corresponding to 57Fe NMR for atoms exhibiting a short-range order of the α-Fe type. The local magnetic structure of the amorphous Fe-B alloys is also considered.

  4. Determination of the stability classes in Angra dos Reis

    International Nuclear Information System (INIS)

    The applicability of the methods for the calculation of atmospheric dispersion used in Angra dos Reis, (site of Angra I - reactor) is discussed. A review is made of the main meteorological parameters indicating turbulence, as well as of the methods presently em ployed for doing dispersion estimates. The turbulence indicator measured in Angra dos Reis and their utilization in the categorization of the stability conditions are discussed. The methods of the rate of vertical temperature variation and the fluctuation of the wind direction to calculate the concentration in the air, are used. The correlations existing between these two methods and their temporal and spacial variation are analysed. The analysis of one-year data allows the conclusion, that, due to the low wind velocity; in Angra dos Reis the fluctuation method is a good indicator of horizontal dispersion, but it does not allow the Knowledge of vertical stability which is better determined by the vertical gradient of temperature. Due to the local condition between the mountains and the sea, only experiments on atmospheric diffusion may indicate the better method for the calculation of local dispersion. (E.G.)

  5. Phases present in FeZr alloy

    International Nuclear Information System (INIS)

    For the Fe-rich region in the binary diagram of FeZr, there is controversy in literature on the existence of the phases ZrFe3 and ZrFe2+x close to ZrFe2. Two alloys were fused together (Zr23Fe77 and Zr15Fe85) in an electric-arc furnace with a Tungsten electrode in an argon atmosphere. Zr 99,95% pure and 99,999% pure Fe were used. The samples were thermically treated at 1050 deg C for 192 hours and at 1230 deg C for 67 hours in an argon atmosphere. Both the samples which had been thermically treated, as well as those which had been fused, were analyzed by X-ray diffraction and metallography, and their compositions were determined by an electronic microprobe. The presence of the ZrFe3 phase was identified as a cubic structure (fcc) which coexists with ZrFe3 and Fe α. The stability of the former is also studied. (Author)

  6. 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)

  7. 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.

  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. Uma visão integrada dos impactos dos estaleiros na gestão ambiental das empreitadas

    OpenAIRE

    Couto, Armanda Bastos; Couto, J. Pedro; Teixeira, José M. Cardoso

    2006-01-01

    Nos últimos anos, o impacto da indústria da construção sobre o ambiente tem sido reconhecido de forma cada vez mais notória. A actividade dos estaleiros de construção em meios urbanos causa agressões ao meio ambiente, interferindo com o dia a dia dos cidadãos que frequentemente reclamam quanto à poeira, à lama, ao ruído, aos atrasos no tráfego, à redução do espaço, aos materiais ou entulho depositados no espaço público, etc .. A indústria da construção tem no nosso país uma importância mu...

  10. 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

  11. 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.

  12. 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.

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

    Energy Technology Data Exchange (ETDEWEB)

    Shao, Lin, E-mail: lshao@tamu.edu [Department of Nuclear Engineering, Texas A and M University, College Station, TX 77843 (United States); Chen, Di; Wei, Chaochen; Martin, Michael S.; Wang, Xuemei [Department of Nuclear Engineering, Texas A and M University, College Station, TX 77843 (United States); Park, Youngjoo; Dein, Ed; Coffey, Kevin R.; Sohn, Yongho [Materials Science and Engineering, University of Central Florida, Orlando, FL 32816 (United States); Sencer, Bulent H.; Rory Kennedy, J. [Materials and Nuclear Fuel Performance, Idaho National Laboratory, Idaho Falls, ID 83415 (United States)

    2015-01-15

    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{sup ++} ion irradiation. The Fe{sup ++} 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{sup ++} 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.

  14. 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.

  15. Fe adsorption on hematite (α-Fe2O3) (0001) and magnetite (Fe3O4) (111) surfaces

    International Nuclear Information System (INIS)

    The structure and electronic properties of different terminations of hematite (0001) and magnetite (111) surfaces upon submonolayer Fe adsorption were studied using the spin-polarized density functional theory (DFT) including the Hubbard correction term U (DFT+U). On both oxides the Fe atoms were adsorbed on the most stable iron and oxygen terminated surfaces. The results show that Fe atoms bind strongly both to hematite and magnetite surfaces, however, the binding is distinctly stronger at the oxygen than at the iron terminated surfaces. For both oxides and surface terminations the binding energy of the Fe decreases with increasing coverage, which indicates substantial repulsive interactions between Fe adatoms. On the hematite surface, the most stable sites for Fe adsorption are bulk continuation sites which result in formation of the Fe-rich terminations. On the magnetite surface, the bulk continuation site is favored only for Fe adsorption on the oxygen terminated surface while on the iron terminated one Fe adsorbs in a position closer to the surface iron layer. Submonolayer coverages of Fe modify substantially the surface electronic structure of the oxides and, depending on the termination, can change its character from half-metallic to insulating one, and vice versa

  16. Al/Fe isomorphic substitution versus Fe2O3 clusters formation in Fe-doped aluminosilicate nanotubes (imogolite)

    International Nuclear Information System (INIS)

    Textural, magnetic and spectroscopic properties are reported of Fe-doped aluminosilicate nanotubes (NTs) of the imogolite type, IMO, with nominal composition (OH)3Al2−xFexO3SiOH (x = 0, 0.025, 0.050). Samples were obtained by either direct synthesis (Fe-0.025-IMO, Fe-0.050-IMO) or post-synthesis loading (Fe-L-IMO). The Fe content was either 1.4 wt% (both Fe-0.050-IMO and Fe-L-IMO) or 0.7 wt% (Fe-0.025-IMO). Textural properties were characterized by High-Resolution Transmission Electron Microscopy, X-ray diffraction and N2 adsorption/desorption isotherms at 77 K. The presence of different iron species was studied by magnetic moment measurements and three spectroscopies: Mössbauer, UV–Vis and electron paramagnetic resonance, respectively. Fe3+/Al3+ isomorphic substitution (IS) at octahedral sites at the external surface of NTs is the main process occurring by direct synthesis at low Fe loadings, giving rise to the formation of isolated high-spin Fe3+ sites. Higher loadings give rise, besides IS, to the formation of Fe2O3 clusters. IS occurs up to a limit of Al/Fe atomic ratio of ca. 60 (corresponding to x = 0.032). A fraction of the magnetism related to NCs is pinned by the surface anisotropy; also, clusters are magnetically interacting with each other. Post-synthesis loading leads to a system rather close to that obtained by direct synthesis, involving both IS and cluster formations. Slightly larger clusters than with direct synthesis samples, however, are formed. The occurrence of IS indicates a facile cleavage/sealing of Al–O–Al bonds: this opens the possibility to exchange Al3+ ions in pre-formed IMO NTs, a much simpler procedure compared with direct synthesis

  17. 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.

  18. Fabrication and physical properties of [Fe/Fe4N]N multilayers with high saturation magnetization

    Science.gov (United States)

    Yu, B.; Lin, L.; Ma, B.; Zhang, Z. Z.; Jin, Q. Y.; Wang, J. P.

    2016-05-01

    [Fe/Fe4N]N multilayers with high saturation magnetization were prepared on MgO(200) substrate, by the DC reactive magnetron sputtering and then annealed at higher temperature. Their structural and magnetic properties were investigated. Epitaxial growth of α-Fe and γ'-Fe4N were demonstrated on MgO, and then excellent [Fe/Fe4N]N was obtained. Though the saturation magnetizations of the as-deposited [Fe/Fe4N]N are slightly below the average value of those of α-Fe and γ'-Fe4N, the saturation magnetization of the annealed [Fe(3.04 nm)/Fe4N(3.04 nm)]5 increases up to 1850 emu/cc, 32 % larger than that of α-Fe film. N atom diffusion from the γ'-Fe4N to the α-Fe layer at high temperature greatly improves the saturation magnetization.

  19. 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.)

  20. Chemical mixing at "Al on Fe" and "Fe on Al" interfaces

    Science.gov (United States)

    Süle, P.; Kaptás, D.; Bujdosó, L.; Horváth, Z. E.; Nakanishi, A.; Balogh, J.

    2015-10-01

    The chemical mixing at the "Al on Fe" and "Fe on Al" interfaces was studied by molecular dynamics simulations of the layer growth and by 57Fe Mössbauer spectroscopy. The concentration distribution along the layer growth direction was calculated for different crystallographic orientations, and atomically sharp "Al on Fe" interfaces were found when Al grows over (001) and (110) oriented Fe layers. The Al/Fe(111) interface is also narrow as compared to the intermixing found at the "Fe on Al" interfaces for any orientation. Conversion electron Mössbauer measurements of trilayers—Al/57Fe/Al and Al/57Fe/Ag grown simultaneously over Si(111) substrate by vacuum evaporation—support the results of the molecular dynamics calculations.

  1. 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...

  2. 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.

  3. 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.

  4. 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

  5. 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

  6. 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.

  7. Magnetostriction of Fe-Sn polycrystalline alloys

    International Nuclear Information System (INIS)

    In the present work we study the magnetostriction of Fe91Sn9 and Fe80Sn20 polycrystalline samples produced by arc melting and heat treated at temperatures of 1153 K for 6 h and 1023 K for 24 h, looking for high values of magnetostriction as in Fe-Ga alloys. Magnetostriction, as well as saturation magnetization measurements, was carried out at temperatures close to 203 K in the magnetic field interval 0 to 1.5 T. Results of magnetostriction on sample Fe91Sn9, which has almost pure α-phase, show magnitude and behavior similar to pure Fe. The two additional Fe80Sn20 samples have a combination of α-phase plus either Fe5Sn3 or Fe3Sn2 and show a peculiar behavior of the magnetostriction. For μ0H0H>0.3 T, the magnetostriction starts again to grow linearly with the field, but saturation was not observed up to 5 T. This behavior was attributed to the presence of Fe5Sn3 or Fe3Sn2 phases in these samples that are also ferromagnetic as the α-phase is

  8. Magnetic reversal processes and critical thickness in FePt/α-Fe/FePt trilayers

    International Nuclear Information System (INIS)

    Magnetic reversal processes of a FePt/α-Fe/FePt trilayer system with in-plane easy axes have been investigated within a micromagnetic approach. It is found that the magnetic reversal process consists of three steps: nucleation of a prototype of domain wall in the soft phase, the evolution as well as the motion of the domain wall from the soft to the hard phase and finally, the magnetic reversal of the hard phase. For small soft layer thickness Ls, the three steps are reduced to one single step, where the magnetizations in the two phases reverses simultaneously and the hysteresis loops are square with nucleation as the coercivity mechanism. As Ls increases, both nucleation and pinning fields decrease. In the meantime, the single-step reversal expands to a standard three-step one and the coercivity mechanism changes from nucleation to pinning. The critical thickness where the coercivity mechanism alters, could be derived analytically, which is found to be inversely proportional to the square root of the crystalline anisotropy of the hard phase. Such a scaling law might provide an easy way to test the present theory. Further increase of Ls leads to the change of the coercivity mechanism from pinning to nucleation. - Highlights: → Analytical critical thickness scales with square root of anisotropy of hard phase. → Reversal process determined nucleation, motion and depinning of domain walls. → Coercivity mechanism is nucleation and pinning for thin and thick soft layers. → Microscopic and macroscopic hysteresis loops calculated.

  9. Exchange-coupling behavior in nanostructured FePt/Fe bilayer films

    Science.gov (United States)

    Liu, Y.; Sellmyer, D. J.

    2016-05-01

    Different thicknesses of FePt/Fe bilayer films are deposited on (001) MgO substrates by sputtering Fe and Pt targets with in-situ heating at 830OC. X-ray diffraction indicates a complete alignment of the FePt [001] axis with MgO [001] axis. The nucleation field Hn is estimated from hysteresis loops measured using a SQUID magnetometer. A FePt/Fe bilayer model is proposed to calculate the nucleation field Hn and compared with the experimental data. The model can explain experimental trends and gives useful predictions for nanostructure synthesis and further experiment.

  10. 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...

  11. 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.

  12. 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

  13. 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. ...

  14. 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...

  15. avaliação das atitudes dos professores de Educação

    OpenAIRE

    Penas, Joana Sofia Luís

    2012-01-01

    O presente estudo tem como principal objetivo avaliar as atitudes dos professores de Educação Física face à utilização dos Jogos Cooperativos como estratégia de inclusão de alunos com Necessidades Educativas Especiais (NEE). Deste modo, verificaram-se as atitudes dos professores de Educação Física face à inclusão de alunos com NEE, face aos Jogos Cooperativos como estratégia de inclusão e recolheram-se, ainda, as opiniões dos docentes sobre a utilização dos Jogos Cooperativos c...

  16. 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

  17. 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

  18. 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...

  19. 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 ...

  20. 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.

  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. Magnetic properties and microstructure of FePtB, FePt(B-Ag) granular films

    Science.gov (United States)

    Tsai, Jai-Lin; Huang, Jian-Chiang; Tai, Hsueh-Wei; Tsai, Wen-Chieh; Lin, Yi-Cheng

    2013-03-01

    Multilayers [FePt(1 nm)/B(t nm)]10 (t=0.05-0.6) were alternately deposited on a glass substrate and subsequently annealed by the rapid thermal process (RTP) at 800 °C for 3 min. After RTP, FePt and B layers intermix to form the FePtB film with (0 0 1) texture. The ordering degree of FePt was slightly increased with doped B. The (Fe-Pt)100-xBx (x=0, 5, 10) films show perpendicular magnetization and the minor FeB phase was indexed in isotropic (Fe-Pt)100-xBx (x=30, 40, 60) films. By adding Ag into (Fe-Pt)95B5 film, the ordering degree was slightly increased in (Fe-Pt)95(B0.9Ag0.1)5 film. In (Fe-Pt)100-xBx (x=5, 10) and (Fe-Pt)95(B0.9Ag0.1)5 granular films, the intermixed B or Ag atoms were diffused among FePt grain boundaries to isolate and refine FePt grains uniformly with average grain sizes of 20, 15, and 6.7 nm, respectively.

  3. 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.

  4. 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.

  5. 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.

  6. 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...

  7. Atitude dos enfermeiros perante o VIH/SIDA

    OpenAIRE

    Rodrigues, Francisco; Barroso, Ana

    2009-01-01

    Os Enfermeiros são um dos grupos profissionais da área da Saúde que recebem grande número de formações acerca da problemática do VIH/SIDA, não só no decorrer da sua Licenciatura como também ao longo da sua vida profissional. Importa assim saber como é que realizam esta aplicação de conhecimentos não só na sua vida profissional como também na sua vida privada.

  8. 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...

  9. Cultivo experimental de dos esponjas marinas en condiciones de laboratorio

    OpenAIRE

    Sánchez-M., H.

    1984-01-01

    Dos especies de esponjas, Desmapsamma anchorata (Cárter. 1882) y Aplysina fistularis insularis (Duch. y Mich., 1864) fueron observadas y recolectadas en la región de Santa Marta (Caribe colombiano). Dichas esponjas presentan características especiales como un rápido crecimiento de fijación en la primera y reproducción asexual por gemación en la segunda. Estos procesos fueron aprovechados para cultivarlas sobre portaobjetos y paralelamente observar su comportamiento en condiciones de lab...

  10. Las dos Valencias cinematográficas del 36

    OpenAIRE

    Sánchez-Biosca, Vicente

    2008-01-01

    La revisión somera de las imágenes cinematográficas que tratan de Valencia y su región por los dos bandos revela la heterogeneidad de la propaganda de ambos y de algunos de los credos que habitaron entre los muros de la República. Sin embargo, la pregunta clave que el historiador precisa hacerse es: ¿qué documenta el cine cuando muchas de estas cosas ya las conocemos por otros medios? La ambigüedad se impone en este punto, puesto que habitualmente el cine todavía no ha ascen...

  11. a percepção dos doentes

    OpenAIRE

    Garret, Ana; Martins, Fernando; Teixeira, Zélia

    2010-01-01

    Objectivo: Este artigo visa divulgar a percepção dos sujeitos com lesão medular relativamente à informação e orientação prestada pelos profissionais de saúde no que respeita à sua sexualidade. Método: Foi feito um inquérito de quatro questões objectivas, relacionadas com a prestação de informações e orientações sobre a sexualidade a uma amostra portuguesa de 35 lesionados medulares em regime de internamento para reabilitação. A amostra foi colhida por snowball e a análise quant...

  12. 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...

  13. 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 ...

  14. O Bem Comum e a Teoria dos Stakeholders

    OpenAIRE

    José António Varela; Nelson António

    2012-01-01

    As preocupações das empresas, sobretudo as maiores, quanto à ética dos seus comportamentos são, neste momento, aparentemente generalizadas, como evidenciam, por exemplo, o discurso que adoptam ou as iniciativas auto-reguladoras a que aderem. Para isso muito têm contribuído a reacção da sociedade aos sucessivos escândalos empresariais e a actividade de grupos de pressão organizados, que apelam a valores não financeiros. No entanto, o movimento da responsabilidade social nas empresas não parece...

  15. Dispersion modelling studies: the 1984 experiment in Angra dos Reis

    International Nuclear Information System (INIS)

    The results of a numerical modelling of an atmospheric dispersion in Angra dos Reis (RJ, Brazil) are considered. A comparison between model results and monitored field concentrations is discussed from the point of view of its statistical as well as physical significance. Particular attention has been paid to the effects of the lack of homogeneity in the spatial scale (horizontal and vertical) and in the time scale (stationarity in the local meteorology), as they can be critical in coastal areas. Some suggestions are made about a real time modelling of the atmospheric dispersion on the considered site. (author)

  16. 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...

  17. Riscos microbiológicos dos produtos de origem vegetal

    OpenAIRE

    Estevinho, Leticia M.; Ricardo C. Calhelha

    2006-01-01

    Nos últimos .anos os consumidores estão mais preocupados com a sua saúde quanto à escolha dos seus alimentos. Os vegetais são amplamente recomendados como parte da alimentação diária pelo seu apreciável conteúdo em vitaminas, sais minerais e fibras alimentares. Tem crescido o interesse, principalmente, per aqueles que apresentam na sua composição substâncias com actividade antioxidante, como os carotenóides, a vitamina C e os flavonóides, que os caracterizam como alimentos f...

  18. 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.

  19. 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 ...

  20. Tras el animal: dos persecuciones ontológicas

    OpenAIRE

    Diego Cagüeñas Rozo.

    2011-01-01

    Las historias de niños salvajes suelen ser vistas como poco más que ficciones. Este ensayo explora dos casos de niños supuestamente criados por animales desde el punto de vista de la etología, tal como la define Deleuze: ¿ciencia práctica de las maneras de ser¿. Con ello se busca cuestionar el proyecto taxonómico que divide el mundo viviente en especies separadas, definidas en acuerdo con la noción de esencia. Al analizar las bases del escepticismo con que son recibidas estas historias, el en...

  1. 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

  2. Desenvolvimento territorial rural no Brasil: limites e potencialidades dos CONSADs

    OpenAIRE

    Antonio César Ortega

    2007-01-01

    A motivação principal desse trabalho é avaliar a capacidade da abordagem territorial em contribuir com o enfrentamento da pobreza e das desigualdades sociais brasileiras, representando uma alternativa de geração de emprego e renda em territórios rurais deprimidos. Por meio dos Consórcios de Segurança Alimentar e Desenvolvimento Local (CONSADs) analisa-se as potencialidades e as dificuldades que essa estratégia vem enfrentando para estabelecer a cooperação entre o poder público e a sociedade c...

  3. 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...

  4. 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...

  5. 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...

  6. 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....

  7. Magnetic studies in Fe/Zn multilayers

    International Nuclear Information System (INIS)

    The structural and magnetic properties of Fe/Zn films prepared by thermal evaporation have been studied by means of X-ray diffraction, vibrating-sample magnetometry and ferromagnetic resonance (FMR). For Fe layer thickness smaller than 20 A the saturation magnetization decreases with decreasing Fe thickness, which is an indication of the island growth of Zn and Fe-Zn interdiffusion at the layer interfaces. The effective field magnetization 4πMeff of the Fe/Zn multilayers was determined from the FMR data in a rotating external magnetic field. The interface anisotropy constant of the Fe/Zn multilayers, KS, is found to be 1.0 erg/cm2 at 300 K. This indicates the presence of a large perpendicular interface anisotropy and this may suggest that the largest part of KS originates from lattice misfit strain

  8. [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.

  9. 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.

  10. 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

  11. 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 ...

  12. 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.

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. Desfazendo os nós heteronormativos da escola: contribuições dos estudos culturais e dos movimentos LGBTTT

    Directory of Open Access Journals (Sweden)

    Raquel Pinho

    2016-01-01

    Full Text Available O trabalho a seguir configura-se como uma pesquisa de caráter teórico, que tem por objetivos compreender as noções de cultura e identidade e, a partir delas e de reflexões a respeito da história e da atuação dos movimentos LGBTTTIV, ponderar possibilidades de superação de práticas escolares heteronormativas. Primeiro, expõe considerações a respeito do conceito de cultura, o que inclui uma explanação acerca dos diferentes tipos de multiculturalismo. Em seguida, articula os conceitos de cultura e identidade, a partir dos quais se destacam os processos de reconhecimento e de representação, fazendo alguns apontamentos sobre igualdade e diferença. Depois, reflete especificamente a respeito das identidades sexuais e as contribuições das estruturas sociais que modelam tais identidades sem, no entanto, as determinarem. A partir disso, enfoca os movimentos LGBTTT como movimentos de ressignificação e resistência das práticas heteronormativas. E, por fim, conclui indicando o pensamento intercultural crítico e pós-moderno como aquele que pode repensar e desconstruir os mecanismos de exclusão das diferenças sexuais presentes no cotidiano escolar. Mas, também, como aquele que pode resgatar a problematização para o espaço escolar, constituindo-o como espaço de discussão, onde as verdades são abaladas. Trata-se do local onde é possível pensar, refletir e se colocar no lugar do outro. Um espaço no qual é possível ser diferente.

  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. 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.

  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 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.

  2. 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.

  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. As fronteiras do poder. O mundo dos rústicos

    Directory of Open Access Journals (Sweden)

    António Manuel Hespanha

    2005-12-01

    Full Text Available O artigo historiográfico analisa aexperiência portuguesa na transição de umdireito costumeiro que foi se transformando,a partir do Séc. XV, em uma categoria de fontedo direito francamente secundária frente àlegislação real e o direito comum, que passarama regular cada vez mais extensamentea vida social. No plano da administração dajustiça, ocorreu o mesmo processo, quando, apartir do Séc. XV, a progressiva intervençãoda justiça real (erudita, teria gradualmentesubstituído a autonomia jurídica dos conselhose dos senhorios (rústicos.This historiographic paper aimsat analyzing the Portuguese experienceconsidering the transition of common law,which changed itself from the XVth century,in a purely secondary law category, whencompared to the real legislation and commonlaw that controlled more and more extensivelysocial life. Concerning justice management,it was the same process, from XVth century,when a continuous intervention of real justice(erudite would gradually have substitutedthe juridical autonomy of Councils as well asthe landlords’ one (peasants.

  5. 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.

  6. High-field transitions in Pr2Fe14B and Nd2Fe14B

    International Nuclear Information System (INIS)

    The field-induced transitions present in the magnetisation curves of Pr2Fe14B and Nd2Fe14B have been investigated in detail. A first-order type of transition is observed in Nd2Fe14B, whereas the experimental data suggest that the transitions in Pr2Fe14B are not of the first order and originate from a fast but nevertheless continuous rotation of the magnetic moment. (orig.)

  7. 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.

  8. 99Ru and 57Fe Moessbauer spectroscopy of a ruthenium alloy, RuFe2Si

    International Nuclear Information System (INIS)

    99Ru and 57Fe-Moessbauer spectroscopic and magnetization measurements were made in order to clarify the magnetic properties of a Huesler alloy, RuFe2Si. The result obtained from 99Ru-Moessbauer spectrum leads to the conclusion that Ru atoms were substituted by both Fe[A,C] and Fe[B], but the latter preferentially. (author) 6 refs.; 5 figs

  9. ETNOGRAFIA, LUGARES DA MEMÓRIA E O DISCURSO DOS PODERES NA ALDEIA DOS ÍNDIOS POTIGUARA.

    OpenAIRE

    José Manuel Simões

    2013-01-01

    RESUMO:A aldeia dos índios Potiguara não é somente um aglomerado de casas e pessoas. Trata-se de um espaço social muito mais complexo, somando ao habitat modelos de parentesco, cruzando práticas culturais e economicas, juntando aos humanos bichos e plantas, rotinas de trabalhos e “libertações” de lazeres. A aldeia Potiguara embora se apresente como singular, ela comunicava e continua a comunicar hoje com redes mais amplas de aldeias rurais e indígenas, gerando transformações culturais e socia...

  10. 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.

  11. 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...

  12. 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...

  13. 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.

  14. 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.

  15. 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.

  16. Spin-polarization in filled-skutterudites LaFe4Pn12 (Pn=P, As and Sb)

    Science.gov (United States)

    Reshak, A. H.

    2016-03-01

    We have performed spin-polarized calculation for the electronic band structure, density of states, Fermi surface and the space electronic charge density distribution for the filled-skutterudites LaFe4Pn12 (Pn=P, As and Sb) compounds. It has been noticed that for both LaFe4P12 and LaFe4As12 there are two bands cross Fermi level (EF) for the spin-up and spin-down states, while for LaFe4Sb12 there is only one band cross EF for the spin-up state and three bands cross EF for the spin-down state. As the partial DOS of La-s,d, Fe-s/p/d and Pn-s/p/d coincide Fermi level at nonzero value, it reveals that the electrons of these orbitals contribute in the conduction process. The calculated values of the density of the states at Fermi level N (EF) and the associated electronic specific heat coefficient (γ) for the spin-up/down states are decreases with substituting P→As→Sb. The bonds nature and the interactions between the atoms for the spin-up/down configurations were investigated in (1 0 0) and (1 0 1) crystallographic planes.

  17. 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.

  18. 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...

  19. Fe deficiency but not anemia up-regulates Fe absorption in breast-fed Peruvian infants

    Science.gov (United States)

    Little is known about homeostatic regulation of iron (Fe) absorption in infants. Using stable isotopes, we evaluated healthy breast-fed Peruvian infants to determine if they can compensate for their poor Fe status by increasing Fe absorption (abs). Two groups were recruited; Group 1 (G1) consisted...

  20. 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...

  1. 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.)

  2. 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.

  3. 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.

  4. 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

  5. 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

  6. 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.

  7. Cyro dos Anjos e O amanuense Belmiro Cyro dos Anjos and Diary of a civil servant (O amanuense Belmiro

    Directory of Open Access Journals (Sweden)

    Rui Mourão

    2010-01-01

    Full Text Available O texto aborda a linguagem de essencialidade machadiana de Cyro dos Anjos e, em seguida, parte para uma interpretação de O amanuense Belmiro, livro insuperável na carreira do autor. Enveredando por caminho inédito na fortuna crítica do romance, que é considerável, propõe uma leitura estrutural que subverte a visão que veio se firmando sobre a obra, revelando-a de dimensões bem mais amplas, debaixo de sol forte, como recriação brasileira do quixotismo de Miguel de Cervantes.The paper discusses Cyro dos Anjos' essentiality on Machado de Assis' language style, and later interprets Cyro's masterpiece O amanuense Belmiro [Amanuensis Belmiro]. Following an unprecedented path through the considerable novel's criticism wealth, this paper takes a structural approach which subverts the signed visions on the work, revealing and broadening its size, under the blazing sun, as a Brazilian Miguel de Cervantes' quixotic recreation.

  8. 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.

  9. Impacto dos investimentos no desempenho das empresas brasileiras.

    Directory of Open Access Journals (Sweden)

    Graziela Fortunato

    2012-08-01

    Full Text Available Este artigo objetiva verificar como o desempenho das empresas de capital aberto, com ações negociadas na Bolsa de Valores de São Paulo entre os anos de 1998 e 2007, é influenciado pelos investimentos de capital realizados pelas empresas. Trabalhos que investigam como os investimentos realizados pelas empresas afetam seu desempenho não são encontrados com facilidade e frequência na literatura (LI, 2004. Os trabalhos encontrados em publicações nacionais concentram-se em analisar o impacto da divulgação dos investimentos nas cotações das ações em bolsa, através da técnica de estudo de eventos (ANTUNES; PROCIANOY, 2003; FAMÁ; LUCCHESI, 2005; LYRA; OLINQUEVICTH, 2007; MCCONNELL; MUSCARELLA, 1985, havendo uma lacuna nas pesquisas sobre os investimentos realizados. Espera-se, por meio deste trabalho, reduzir a lacuna existente ao verificar o impacto dos investimentos do desempenho das empresas por meio de dados de painel. A técnica de análise de regressão em painel foi utilizada numa amostra de 508 empresas. Foram adotadas como proxys para o desempenho das empresas o valor de mercado e o lucro operacional (Ebit. Os resultados encontrados indicam que, pela métrica do mercado, os investimentos influenciam positivamente o desempenho das empresas; no entanto, pela métrica contábil, não há evidências da existência de relação. Os resultados obtidos sugerem, ainda, que as conclusões dos trabalhos de Lyandres, Sun e Zhang (2008 e Titman, Wei e Xie (2004 não são verificadas nas empresas brasileiras, visto que não se encontrou relação negativa entre os investimentos e o desempenho das empresas. Com esses resultados, espera-se fornecer subsídios que auxiliem tanto a construção de cenários para precificação e valuation das empresas, como também uma orientação da qualidade da decisão de investimentos por parte de seus gestores.

  10. 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

  11. 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...

  12. 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

  13. Structural stability, half-metallicity and magnetism of the CoFeMnSi/GaAs(0 0 1) interface

    Science.gov (United States)

    Feng, Yu; Chen, Xiaorui; Zhou, Ting; Yuan, Hongkuan; Chen, Hong

    2015-08-01

    The ferromagnet/semiconductor interface plays a crucial role in the performance of advanced magnetic tunnel junctions (MTJs) built of ferromagnetic electrodes and semiconductor as a spacer. We investigate the interface character between LiMgPbSb-type Heusler alloy CoFeMnSi and semiconductor GaAs by using the first-principles density functional simulations. In our calculations, we build two kinds of interface structures, namely the top-type and the bridge-type structure by connecting the termination of nine CoFeMnSi layers to the top of the As-terminated GaAs layer and the bridge site between interface As atoms, respectively. The calculated phase diagram indicated that the CoFe-terminated interface is more stable in the bridge-type structure than in the top-type structure, and a favored MnMn- or MnSi-terminated interface will appear in the top-type structure instead of the bridge-type structure under Fe-rich conditions. Besides, our calculation reveals that interface Mn and interface Fe atoms prefer to extend outward and their atom-resolved spin magnetic moments are enhanced due to the rehybridization caused by the symmetry breaking at the interface, while interface Co atoms shrink inward and their moments are decreased compared with the bulk value. Further analysis on DOS and PDOS indicates that owing to the interface effect, the half metallicity of CoFe-, MnSi-, and SiSi-terminated interfaces is completely destroyed. However, the MnMn-terminated interface in the top-type structure preserves 100% spin polarization, indicating that the CoFeMnSi/GaAs heterostructure with the top-type MnMn-terminated interface has more advantages than other atomic terminations in spintronics applications.

  14. Ab initio calculations of martensitic phase behavior in Ni2FeGa magnetic shape memory alloys

    International Nuclear Information System (INIS)

    Highlights: • L21, NM and 5M phases have the energy minimum at a = 5.76 Å, c/a = 1.33 and c/a = 0.99. • Decrement in moment of Ni and increment in that of Fe reflect electrons transfer. • Differences in minority DOS over MT lead to stabilize the final structure. • C' taking small value in L21 leads to elastic instability in MT. - Abstract: A series of spin polarized energy calculations based on density functional theory (DFT) have been carried out to investigate the structural, magnetic, electronic and mechanical properties of Ni2FeGa magnetic shape memory alloys (MSMA’s) in the austenitic and martensitic structures. We report that L21 austenitic phase is metastable at a = 5.76 Å, the NM tetragonal and 5M monoclinic martensitic structures are stable at c/a = 1.33 and c/a = 0.99, respectively. That the electron removes from Ni to Fe site during phase transformation to martensite is confirmed by the increment in the magnetic moment of Ni, while decrement in that of Fe. The analysis of the partial density of states show that some distinguishable differences in the minority spin states occur upon martensitic phase transformation, such as, the replacement of the Fe states (eg and t2g) above Fermi level by only Fe-t2g states during L21-5M transformation and the splitting of Fe-t2g states near Fermi level during 5M-NM transformation (through 7M). These changes lower the energy of the system, indicating that the final structure becomes stable. The soft tetragonal shear constant C′ of the austenitic phase designates the ease of the phase transition into martensitic phase. It is shown that the results calculated in this study are in good agreement with the previous calculations and the available experiments

  15. [2Fe-2S] Proteins in chlorosomes

    DEFF Research Database (Denmark)

    Johnson, T. Wade; Li, Hui; Frigaard, Niels-Ulrik;

    2013-01-01

    . (2013) Biochemistry 52, preceding paper in this issue ( DOI: 10.1021/bi301454g )]. The electron paramagnetic resonance (EPR) spectra, g values, and line widths of the Fe-S clusters in individual CsmI, CsmJ, and CsmX proteins were obtained from studies with isolated chlorosomes. The Fe-S clusters in...

  16. 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...

  17. 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.)

  18. 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...

  19. 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

  20. The lattice position of Fe in Fe-doped LiNbO3

    International Nuclear Information System (INIS)

    The lattice location of Fe atoms in Fe-doped LiNbO3 is determined experimentally employing X-ray standing waves. At a bulk concentration of 7.48x1018 cm-3 Fe is found to occupy sites close to the ferroelectric Li position; shifted by 0.18 AA in the direction of the -c axis. Electronic structure calculations confirm this result insofar as computed spectroscopic data are more consistent with the respective experimental values for Fe located in the vicinity of the Li site than for Fe occupying the Nb lattice position. (author)

  1. 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.

  2. 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.

  3. 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.

  4. 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

  5. Thermodynamic Properties of $^{56,57}$Fe

    CERN Document Server

    Algin, E; Guttormsen, M; Larsen, A C; Mitchell, G E; Rekstad, J; Schiller, A; Siem, S; Voinov, A

    2008-01-01

    Nuclear level densities for $^{56,57}$Fe have been extracted from the primary $\\gamma$-ray spectra using ($^3$He,$^3$He$^{\\prime}\\gamma$) and ($^3$He,$\\alpha \\gamma$) reactions. Nuclear thermodynamic properties for $^{56}$Fe and $^{57}$Fe are investigated using the experimental level densities. These properties include entropy, Helmholtz free energy, caloric curves, chemical potential, and heat capacity. In particular, the breaking of Cooper pairs and single-quasiparticle entropy are discussed and shown to be important concepts for describing nuclear level density. Microscopic model calculations are performed for level densities of $^{56,57}$Fe. The experimental and calculated level densities are compared. The average number of broken Cooper pairs and the parity distribution are extracted as a function of excitation energy for $^{56,57}$Fe from the model calculations.

  6. 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.

  7. 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.

  8. Moessbauer and XRD study of pulse plated Fe-P and Fe-Ni thin layers

    Energy Technology Data Exchange (ETDEWEB)

    Miko, Annamaria [Bay Zoltan Institute for Material Science (Hungary); Kuzmann, Erno, E-mail: kuzmann@para.chem.elte.hu [Eoetvoes Lorand University, Research Group for Nuclear Methods in Structural Chemistry, Hungarian Academy of Sciences, Department of Nuclear Chemistry (Hungary); Lakatos-Varsanyi, Magda [Bay Zoltan Institute for Material Science (Hungary); Kakay, Attila [Research Institute for Solid State Physics and Optics (Hungary); Nagy, Ferenc [Eoetvoes Lorand University, Research Group for Nuclear Methods in Structural Chemistry, Hungarian Academy of Sciences, Department of Nuclear Chemistry (Hungary); Varga, Lajos Karoly [Research Institute for Solid State Physics and Optics (Hungary)

    2005-09-15

    {sup 57}Fe conversion electron Moessbauer spectroscopy, X-ray diffraction, electrochemical and magnetic measurements were used to study pulse electroplated Fe-P and Ni-Fe coatings. XRD and {sup 57}Fe CEMS measurements revealed the amorphous character of the novel pulse plated Fe-P alloys. CEM spectra indicated significant differences in the short range order and in the magnetic anisotropy between the Fe-P deposits pulse plated at medium long deposition time (t{sub on} = 2 ms), with short relaxation time (t{sub off} = 9 ms) and low current density (I{sub p} = 0.05 Acm{sup -2}) or at short deposition time (t{sub on} = 1 ms) with long relaxation time (t{sub off} = 250 ms) and high current density (I{sub p} = 1.0 Acm{sup -2}). The broad peaks centred around the fcc reflections in XRD of the pulse plated Ni-22 wt.% Fe deposit reflected a microcrystalline Ni-Fe alloy with a very fine, 5-8 nm, grain size. The CEM spectrum of the pulse plated Ni-22 wt.% Fe coating corresponded to a highly disordered solid solution alloy containing a minute amount of ferrihydrite. Extreme favourable soft magnetic properties were observed with these Ni-Fe and Fe-P pulse plated thin layers.

  9. Mitigation of Random Query String DoS via Gossip

    CERN Document Server

    Ferretti, Stefano

    2011-01-01

    This paper presents a mitigation scheme to cope with the random query string Denial of Service (DoS) attack, which is based on a vulnerability of current Content Delivery Networks (CDNs). The attack exploits the fact that edge servers composing a CDN, receiving an HTTP request for a resource with an appended random query string never saw before, ask the origin server for a (novel) copy of the resource. Such characteristics can be employed to take an attack against the origin server by exploiting edge servers. Our strategy adopts a simple gossip protocol executed by edge servers to detect the attack. Based on such a detection, countermeasures can be taken to protect the origin server and the CDN against the attack. We provide simulation results that show the viability of our approach.

  10. 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 ...

  11. 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.

  12. 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...

  13. 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...

  14. Valor dos espaços verdes da cidade

    OpenAIRE

    Montez, Cristina Isabel Alves Pereira

    2009-01-01

    Os espaços verdes exercem funções essenciais à qualidade de vida urbana como sejam as ecológico-ambientais, de conforto ambiental, de recreio e lazer, estético-culturais e identitárias que acabam por referenciar/orientar o indivíduo interior e exteriormente. No entanto, quando estes espaços estão sob a pertença privada, fazem recair sobre o seu proprietário todos os encargos fiscais relativos à posse e todos os custos económicos relativos à manutenção e preservação dos mesmo...

  15. 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...

  16. Persistency of atmospheric diffusion conditions in Angra dos Reis - Brazil

    International Nuclear Information System (INIS)

    Based on a 2 year observation period, the diffusion conditions at the Almirante Alvaro Alberto N.P.P. site, in Angra dos Reis, are analized with respect to persistency as a function of the wind direction, the Pasquill stability class and the time of the day. The Pasquill stability class relates to the bulk vertical temperature gradient measured between 2m and 50m in the atmosphere; the wind direction is measured at 50m height. The persistency is defined in this report as the probability that the wind direction will remain longer than a given time in a sector without change in the diffusion category by more than a certain stage. During the day the persistency is mostly affected by the sea breeze with predominance of the unstable and neutral categories. At night the stable categories dominate. The alternating sea and land breezes disturb daily the trade wind field resulting in low persistency of the diffusion conditions. (Author)

  17. 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.

  18. Anomalous magnetic moments in Fe-Pt and Fe-Pd Invar alloys under high pressure

    International Nuclear Information System (INIS)

    Magnetization measurements have been carried out for disordered Fe72Pt28, Fe66Pd34, and Fe68Pd32 Invar alloys under high pressure using a technique combining a pressure-clamp-type Drickamer cell and a pulse magnet. In Fe72Pt28 at room temperature, the magnetization decreased rapidly with increasing pressure up to 2.5 GPa, but above 2.5 GPa the rate of decrease became small and remained at a small value up to 5.6 GPa. In Fe-Pd Invar alloys at room temperature, the magnetization decreased linearly with increasing pressure. But, at 4.2 K, the change of magnetization with pressure was small in Fe66Pd34, which means that Fe66Pd34 behaves as a strong ferromagnet

  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. 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.

  1. 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.

  2. 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.

  3. O futuro incerto dos partidos políticos argentinos

    Directory of Open Access Journals (Sweden)

    Edgardo Mocca

    2005-12-01

    Full Text Available A INÉDITA crise vivida pela Argentina entre o fim de 2001 e o início de 2002 constituiu uma séria ameaça para a estabilidade democrática do país. Este artigo se concentra nas conseqüências que a crise trouxe para o sistema de partidos políticos argentinos. Analisa-se como, contrariamente à maioria dos prognósticos, os partidos existentes não implodiram sob os efeitos do múltiplo desmoronamento. Igualmente, busca-se analisar as mudanças graduais que se foram produzindo na cena política, particularmente como conseqüência das novidades introduzidas pela gestão do presidente Kirchner. Esboça-se uma hipótese sobre as perspectivas de desenvolvimento do sistema de partidos a partir das eleições de outubro de 2005 (o artigo foi escrito antes dos comícios.THE UNPRECEDENTED crisis in Argentina in late 2001 and early 2002 posed a serious threat to the country's democratic stability. This essay focuses the consequences of the crisis to the Argentinean political party system. It analyzes how, at odds with most forecasts, the existing parties did not implode as a result of the multiple collapse. It also seeks to analyze the gradual changes that took place in the political scene, particularly as a consequence of the President Kirchner's new policies. And it presents an outline of possible developments in the country's party system after this year's October elections (the essay was written before the political rallies.

  4. 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.

  5. 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.

  6. 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.)

  7. Estudio de la adaptabilidad de cuatro genotipos de guisante (pisum setivum l. var. macrocarpon) bajo dos densidades y en dos localidades

    OpenAIRE

    Aguilar, Miguel; Brusco, Patricia; Martínez, Ricardo

    2011-01-01

    Se evaluó y comparó el comportamiento agronómico de cuatro variedades de guisante Pisum satim L. var. macrocarpon bajo dos densidades y en dos localidadesmediante cultivos a libre exposición durante dos semestres. Se midieron variables de tipo morfofisiológico y reproductivo. Las cuatro variedades se adaptaron bien al medio ambiente ya que sus rendimientos fueron bastante aceptables. La variedad Super Mel Sugar logró los mejores puntajesen rendimiento y calidad además de la mayor capacidad de...

  8. Análise dos estilos de gestão do conflito predominantes em ambiente laboral dos enfermeiros da ilha de S.Miguel

    OpenAIRE

    Franque, Pedro Futi

    2007-01-01

    O presente trabalho retrata os estilos de gestão do conflito predominantes em ambiente laboral dos enfermeiros da ilha de S. Miguel. A ideia central deste trabalho de investigação passa fundamentalmente pelo processo de gestão de conflitos, mais precisamente pelos estilos de gestão de conflitos interpessoais, matéria importante para a compreensão dos comportamentos, dos estilos utilizados pelos enfermeiros, ou a actuação perante uma situação do conflito. O estudo é descritivo porque procura c...

  9. 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...

  10. 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...

  11. Novel Fe@Fe-O@Ag nanocomposite for efficient non-enzymatic sensing of hydrogen peroxide

    International Nuclear Information System (INIS)

    Here, we present a novel non-enzymatic electrochemical sensor based on a zerovalent iron–iron oxide–silver nanocomposite (Fe@Fe-O@Ag) which is suitable for highly sensitive detection of hydrogen peroxide. Silver nanoparticles were prepared by simple reduction of silver ions on the surface of nanoscale zerovalent iron (nZVI) owing to the strong reductant efficiency of nZVI. The morphology, chemical and phase composition of the Fe@Fe-O@Ag nanocomposite was monitored by TEM, SEM, X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX). The electrochemical properties of Fe@Fe-O@Ag modified glassy carbon electrodes were characterized by voltammetric techniques and electrochemical impedance spectroscopy (EIS). The experimental data indicated that Fe@Fe-O did not contribute significantly to hydrogen peroxide sensing. Thus, Fe@Fe-O just serves as a substrate for the deposition of silver nanoparticles, whereas H2O2 detection is principally effected by the silver nanoparticles. Electrodes modified with the Fe@Fe-O@Ag nanocomposite showed a stable and sensitive response towards hydrogen peroxide reduction, exhibiting a wide linear dependence over H2O2 concentrations from 5 μmol L−1 to 1 mmol L−1 with a sensitivity of 460.34 μA μM−1 cm−2 and detection limit of 5.19 × 10−9 mol L−1. These results imply that the proposed Fe@Fe-O@Ag nanocomposite could be successfully used as a highly efficient and stable platform for hydrogen peroxide detection

  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. Chemical Excision of Tetrahedral FeSe2 Chains from the Superconductor FeSe: Synthesis, Crystal Structure, and Magnetism of Fe3Se4(en)2

    Science.gov (United States)

    Pak, Chongin; Kamali, Saeed; Pham, Joyce; Lee, Kathleen; Greenfield, Joshua T.; Kovnir, Kirill

    2014-01-01

    Fragments of the superconducting FeSe layer, FeSe2 tetrahedral chains, were stabilized in the crystal structure of a new mixed-valent compound Fe3Se4(en)2 (en = ethylenediamine) synthesized from elemental Fe and Se. The FeSe2 chains are separated from each other by means of Fe(en)2 linkers. Mössbauer spectroscopy and magnetometry reveal strong magnetic interactions within the FeSe2 chains which result in antiferromagnetic ordering below 170 K. According to DFT calculations, anisotropic transport and magnetic properties are expected for Fe3Se4(en)2. This compound offers a unique way to manipulate the properties of the Fe-Se infinite fragments by varying the topology and charge of the Fe-amino linkers. PMID:24299423

  14. Propriedades químicas e cristalográficas da caulinita e dos óxidos de ferro em sedimentos do grupo barreiras no município de Aracruz, estado do Espírito Santo

    Directory of Open Access Journals (Sweden)

    V. F. Melo

    2002-03-01

    Full Text Available As propriedades químicas e cristalográficas detalhadas da caulinita (Ct e dos óxidos de ferro do solo e dos sedimentos do Grupo Barreiras são pouco conhecidas. Para estudar as características desses minerais em profundidade, coletaram-se 11 amostras (0,7; 1,4; 2,1; 2,8; 3,5; 4,2; 4,9; 5,6; 7,7; 10,5 e 14m nos horizontes Bt, BC e C de um Argissolo Amarelo no município de Aracruz (ES. As frações argila e silte foram estudadas por difração de raios-X (DRX, análise termo-diferencial (ATD e microscopia eletrônica. Os teores totais de Fe e outros microelementos (Cr, Mn, Ni, Pb, Ti e Zn da fração argila foram determinados por espectrometria por emissão por plasma, após digestão da amostra com HF concentrado. Nos extratos resultantes das extrações com oxalato de amônio (OA e ditionito-citrato-bicarbonato (DCB, determinaram-se os teores de Fe, Al, Si, Cr, Mn, Ni, Pb, Ti e Zn. A composição química da Ct das frações argila (amostra desferrificada e silte (amostra natural foi determinada pelo tratamento com NaOH 5molL-1 e pela combinação de aquecimento e extração com NaOH 0,5molL-1 fervente, respectivamente. O teor médio de Fe2O3 da Ct da fração argila (20,7gkg-1 foi superior ao obtido para a fração silte (5,2gkg-1, verificando-se, na menor fração, aumento nos teores de Fe2O3 com a profundidade. Graças ao maior raio iônico, a presença do Fe3+ na estrutura promoveu aumento no espaço interplanar do mineral, sobretudo na direção b. O tamanho das partículas de Ct foi semelhante entre os horizontes amostrados. A Ct apresentou grau semelhante de cristalinidade com a profundidade do solo, com exceção dos horizontes mais superficiais, os quais apresentaram menores valores de índice de cristalinidade, provavelmente por interferências com compostos orgânicos. A redução dos teores de Fe2O3 extraídos pelo DCB e da participação dos teores de FeOA mais FeDCB no Fe total da fração argila com a profundidade foi atribu

  15. Inferência de percursos dos utentes de um transporte coletivo

    OpenAIRE

    Baeta, Nuno José Bigodinho

    2015-01-01

    Nos dias de hoje, os dispositivos móveis inteligentes com o Smartphone fazem parte do dia-a-dia de cerca 46% dos utilizadores de telemóvel, representando por isso quase metade da população portuguesa. Estes dispositivos são dotados de muitas funcionalidades que permitem a deteção do movimento dos seus utilizadores, quer através dos seus sensores GPS e acelerómetro, quer por via dos módulos de comunicação sem fios Bluetooth e WiFi, e por isso podem ser usados para passivamente c...

  16. 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...

  17. FIRST X-RAY CRYSTAL STRUCTURE OF A BIMETALLIC COMPLEX CONTAINING A p -COORDINATED HYDRAZONE: [(h 5-CpFe(h 6-p-MeOC6H4-NHN=CH-(h 5-C5H4Fe(h 5-Cp]+PF6

    Directory of Open Access Journals (Sweden)

    Carolina Manzur

    2001-12-01

    Full Text Available The dinuclear organometallic hydrazone [(h 5-CpFe(h 6-p-MeO-C6H4-NHN=CH-(h 5-C5H4Fe(h 5-Cp]+PF6- (Cp=C5H5 is stereoselectively prepared as its trans isomer by reacting the organometallic hydrazine precursor [(h 5-CpFe(h 6-p-MeO-C6H4-NHNH2]+PF6- with the ferrocenecarboxaldehyde. Its crystalline and molecular structure has been determined and consists of two iron(II sandwiches of the type [(h 5-CpFe(h 6-arene]+ and [(h 5-C5H4Fe(h 5-Cp], in anti position one with respect to the other, and linked by a zigzag hydrazonic spacerLa hidrazona organometálica dinuclear [(h 5-CpFe(h 6-p-MeO-C6H4-NHN=CH-(h 5-C5H4Fe(h 5-Cp]+PF6- es preparada estereoquímicamente como su isómero trans por reacción de la hidracina organometálica precursora [(h 5-CpFe(h 6-p-MeO-C6H4-NHNH2]+PF6- con ferrocencarboxaldehido. Se ha determinado su estructura cristalina y molecular que consiste en dos sanwiches de hierro(II del tipo [(h 5-CpFe(h 6-areno]+ y [(h 5-C5H4Fe(h 5-Cp] en posición anti uno respecto del otro, los que se encuentran enlazados por un espaciador hidrazónico en forma de zig-zag

  18. 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.

  19. 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)

  20. 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

  1. 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...

  2. 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...

  3. 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

  4. Ge doping of FeGa3

    Science.gov (United States)

    Alvarez-Quiceno, J. C.; Cabrera-Baez, M.; Munévar, J.; Micklitz, H.; Bittar, E. M.; Baggio-Saitovitch, E.; Ribeiro, R. A.; Avila, M. A.; Dalpian, G. M.; Osorio-Guillén, J. M.

    2015-03-01

    The intermetallic narrow-gap semiconductor FeGa3 is one of the few Fe-based diamagnetic materials. Experimentally, Ge doping induces a ferromagnetic (FM) state. The mechanism responsible for this FM response is still unestablished, but there are proposals of itinerant magnetism to explain this behavior. Our DFT simulations show that inserting holes induces a delocalized FM response, while inserting electrons induces a localized FM response around some Fe atoms. We also modeled different distributions of Ge substitution and observe that the FM response depends on the Ge concentration and also on the Ge distribution on the Ga sites. We observed that the extra electrons become localized in some specific Fe atoms, rather than delocalized over the entire crystal lattice, as expected from an itinerant model. For experimental probing of this scenario, we have performed 57Fe Mössbauer spectroscopy on flux-grown singlecrystalline samples. The resulting resonance peak shape supports a localized model for ferromagnetism, since it is possible to resolve the presence of two distinct Fe isomer shifts (despite a single crystallographic site), expected to correspond to Fe atoms with high and low magnetic moments. The authors thank Capes, CNPQ and FAPESP for financial support.

  5. Constitution of Fe-Co-Gd system

    International Nuclear Information System (INIS)

    The Fe-Co-Gd phase diagram has been determined using optical microscopy, scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX) differential thermal analysis (DTA) and X-ray diffractometry. Their compounds namely; (Fe/sub 1-x/Co/sub x/)/sub 17/Gd/sub 2/, (Fe/sub 1-x/Co/sub x/)/sub 3/Gd and (Fe/sub 1-x/sub Co/sub x/)/sub 2/Gd showed complete range of solid solubility. Three other compounds i.e., (Fe/sub 1-x/Co/sub x/)/sub 5/Gd, (Fe/sub 1-x/Co/sub x/)/sub 23/Gd/sub 6/ and Fe/sub 1-x/Co/sub x/)/sub 7/Gd/sub 2/ showed limited but significant solid solubility. In addition, three invariant three phase reactions were also identified. An isothermal section at 1100 deg. C and the liquidus projection of this system were determined. (author)

  6. Design and magnetic properties of L10–FePt/Fe and L10–FePt exchange coupled graded nanodots

    International Nuclear Information System (INIS)

    The magnetic properties and reversal process of L10–FePt/Fe and L10–FePt exchange coupled graded nanodots were investigated using the object-oriented micromagnetic framework (OOMMF). It is indicated that the increase in anisotropy gradient span of L10–FePt section is favorable for the reduction in coercivity for L10–FePt/Fe graded nanodots. However, the low remanence magnetization and squareness ratio caused by the large gradient span is not popular for recording media. If the Fe soft section is removed, the low coercivity and high squareness ratio can be achieved simultaneously for L10–FePt graded nanodots with an appropriate gradient design. Therefore, the combination of exchange coupled graded structure and bit patterned media is an effective approach to balance the trilemma issues of current perpendicular magnetic recording media. - Highlights: • The magnetic properties and reversal process of L10–FePt/Fe and L10–FePt exchange coupled graded nanodots were investigated using the object-oriented micromagnetic framework. • The increase in anisotropy gradient span of L10–FePt section is favorable for the reduction in coercivity for L10–FePt/Fe graded nanodots. • The low coercivity and high squareness ratio can be achieved simultaneously for L10–FePt graded nanodots with an appropriate gradient design

  7. One Electron Makes Differences: From Heme {FeNO}(7) to {FeNO}(8).

    Science.gov (United States)

    Hu, Bin; Li, Jianfeng

    2015-09-01

    The first X-ray single-crystal structure of a {FeNO}(8) porphyrin complex [Co(Cp)2][Fe(TFPPBr8)(NO)], and the structure of the {FeNO}(7) precursor [Fe(TFPPBr8)(NO)] are determined at 100 K. The two complexes are also characterized by FTIR and UV/Vis spectroscopy. [Fe(TFPPBr8)(NO)](-) shows distinct structural features in contrast to a nitrosyl iron(II) porphyrinate on the Fe-N-O(-) moiety, which include a much more bent Fe-N-O(-) angle (122.4(3)°), considerably longer Fe-NO(-) (1.814(4)) and N-O(-) (1.194(5) Å) bond distances. These and the about 180 cm(-1) downshift ν(N-O) stretch (1540 cm(-1)) can be understood by the covalently bonding nature between the iron(II) and the NO(-) ligand which possesses a two-electron-occupied π* orbital as a result of the reduction. The overall structural features of [Fe(TFPPBr8)(NO)](-) and [Fe(TFPPBr8)(NO)] suggest a low-spin state of the iron(II) atom at 100 K. PMID:26205502

  8. 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...

  9. 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...

  10. Biomineralization associated with microbial reduction of Fe3+ and oxidation of Fe2+ in solid minerals

    Science.gov (United States)

    Zhang, G.; Dong, H.; Jiang, H.; Kukkadapu, R.K.; Kim, J.; Eberl, D.; Xu, Z.

    2009-01-01

    Iron-reducing and oxidizing microorganisms gain energy through reduction or oxidation of iron, and by doing so play an important role in the geochemical cycling of iron. This study was undertaken to investigate mineral transformations associated with microbial reduction of Fe3+ and oxidation of Fe2+ in solid minerals. A fluid sample from the 2450 m depth of the Chinese Continental Scientific Drilling project was collected, and Fe3+-reducing and Fe2+-oxidizing microorganisms were enriched. The enrichment cultures displayed reduction of Fe3+ in nontronite and ferric citrate, and oxidation of Fe2+ in vivianite, siderite, and monosulfide (FeS). Additional experiments verified that the iron reduction and oxidation was biological. Oxidation of FeS resulted in the formation of goethite, lepidocrocite, and ferrihydrite as products. Although our molecular microbiological analyses detected Thermoan-aerobacter ethanolicus as a predominant organism in the enrichment culture, Fe3+ reduction and Fe2+ oxidation may be accomplished by a consortia of organisms. Our results have important environmental and ecological implications for iron redox cycling in solid minerals in natural environments, where iron mineral transformations may be related to the mobility and solubility of inorganic and organic contaminants.

  11. 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.

  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. 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).

  15. Structural and electronic properties of metalloporphyrin (MP, M = Fe, Co and Zn) adsorbed on single walled BNNT and SiCNT

    Science.gov (United States)

    Rezvani, M.; Darvish Ganji, M.; Jameh-Bozorghi, S.

    2016-01-01

    In the present work, we report a detailed theoretical investigation of a series of metalloporphyrin, MP (M = FeP, CoP and ZnP), molecules interacting with silicon carbide nanotube (SiCNT) by means of density functional theory (DFT) calculations. In all calculations, we used the Perdew-Burke-Erzenhof (PBE) functional as employed in the SIESTA package. The detailed analysis of the structural and electronical properties of various optimized configurations is performed. The results show that among the MPs, adsorption of FeP molecule on the Si site with zigzag orientation is the most energetically preferable with a binding energy of -2.10 eV. Compared to SiCNTs, boron nitride nanotubes (BNNTs) have weaker interaction strength with the FeP molecule with -0.34 eV of binding energy. We have analyzed charge transfer between two interacting species trough well-known Mulliken, Hirshfeld and Voronoi charges analysis for aforementioned systems. The spin-polarized DFT calculations showed that the density of states (DOSs) are spin-polarized for the Fe-BNNT complex while the spin-polarization of the DOS spectra turn out to be less notable for MP-SiCNT complexes. Our results propose that FeP-SiCNT complex could be used for interesting applications in solar cell technology and nano-biosensors while FeP-BNNT complex might be considered for spintronic molecular devices.

  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. Curie temperature rising by fluorination for Sm2Fe17

    Directory of Open Access Journals (Sweden)

    Matahiro Komuro

    2013-02-01

    Full Text Available Fluorine atoms can be introduced to Sm2Fe17 using XeF2 below 423 K. The resulting fluorinated Sm2Fe17 powders have ferromagnetic phases containing Sm2Fe17FY1(0Fe17FY2 (1Fe17, and α-Fe. The unit cell for Sm2Fe17 is elongated by the fluorination. The largest unit cell volume among the rhombohedral Sm2Fe17 compounds is 83.8 nm3, which is 5.8% larger than Sm2Fe17. The rhombohedral Sm2Fe17 with the largest unit cell volume is dissociated above 873 K, and fluorination increases Curie temperature from 403 K for Sm2Fe17 to 675 K. This increase can be explained by the magneto-volume effect.

  18. 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

  19. 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.

  20. Complicações dos esvaziamentos cervicais Neck dissection complications

    Directory of Open Access Journals (Sweden)

    Rogério Aparecido Dedivitis

    2011-02-01

    Full Text Available Devido à proximidade de estruturas vitais, certas complicações são inerentes ao esvaziamento cervical (EC para o tratamento de pacientes portadores de carcinoma epidermoide das vias aerodigestivas superiores. OBJETIVO: Determinar a incidência de complicações dos EC. MÉTODOS: Estudo retrospectivo transversal de avaliação de prontuários. Entre janeiro de 1995 e dezembro de 2008, foram avaliados EC com finalidade curativa em 480 pacientes portadores de carcinoma espinocelular das vias aerodigestivas superiores, sendo estudada a ocorrência de complicações perioperatórias. RESULTADOS: Considerando o número total de lados esvaziados, foram estudados 413 EC radicais e 295 EC seletivos, dos quais 220 foram EC supraomo-hioideos e 75 foram EC jugulares, totalizando 708 lados avaliados. Não houve óbito. A complicação mais frequente foi a lesão do nervo mandibular marginal (5,5%, seguida da lesão do nervo acessório (5,1%, contudo, destes, em 18/21 casos o nervo foi sacrificado por razões de radicalidade oncológica. CONCLUSÕES: Não houve óbito no período peroperatório. As lesões mais comuns são nervosas, com maior incidência de lesão do nervo mandibular marginal (5,5%.Because of the proximity of vital structures, certain complications are inherent to neck dissection (ND for the treatment of patients with squamous cell carcinoma of the upper aerodigestive tract. AIM: To establish the incidence of complications of ND. METHODS: A cross-sectional retrospective study of patient registries. ND with curative intention was evaluated in 480 patients with squamous cell carcinoma of the upper aerodigestive tract from January 1995 to December 2008 to identify perioperative complications. RESULTS: Considering the total quantity of dissected neck sides, 413 radical ND and 295 selective ND were studied, of which 220 were supraomohyoid ND and 75 were jugular ND, totaling 708 sides. There were no deaths. The most frequent complication was