WorldWideScience

Sample records for adaptacion al turno

  1. Resistencia al cambio y trabajo por turnos en trabajadores de la banca

    Daniel V. Valero R.

    2011-01-01

    Full Text Available Este artículo muestra los factores de resistencia al cambio ante la implementación de un esquema de trabajo por turnos para el personal del departamento de bases de datos de una institución bancaria venezolana, con el objetivo de diseñar un plan para el manejo del cambio, a través del cual la gerencia pueda intervenir y lograr superar dicha resistencia. La investigación consistió en un estudio de caso, que parte de realizar un diagnóstico que permitió identificar factores de resistencia como la disminución del ingreso económico, amenaza a hábitos familiares e intereses propios y seguridad personal; para luego diseñar un plan de manejo del cambio que le permitirá a la gerencia del área implantar el esquema de horarios de trabajo por turnos, con el menor impacto posible sobre el personal.

  2. RESPUESTAS Y ADAPTACIONES FISIOLÓGICAS AL ENTRENAMIENTO DE TAEKWONDO. UNA REVISIÓN SISTEMÁTICA

    Pedro Carazo Vargas

    2013-12-01

    Full Text Available El objetivo de analizar las principales respuestas y adaptaciones fisiológicas que se asocian a la práctica del taekwondo se plantea para evaluar el desarrollo del conocimiento en esta área y orientar a entrenadores y deportistas acerca de los procesos de entrenamientos más apropiados. Por lo tanto, se realiza una búsqueda sistemática en las bases de datos: "Academic Search Complete, ERIC, Medline, SportDiscus, Proquest, y Ovid". De las cuales se toman en cuenta solo investigaciones publicadas en revistas científicas y se incluyen únicamente las variables que fueron analizadas en un mínimo de cinco estudios. Dicho requisito se cumplió para la fuerza (independientemente de su manifestación, la capacidad aeróbica, la frecuencia cardíaca y la producción de lactato sanguíneo. Veintiocho publicaciones aportaron sus hallazgos a la presente revisión bibliográfica. No existe suficiente congruencia en la evidencia desarrollada que permita establecer tendencias sobre el volumen e intensidad de cargas de trabajo más adecuadas para guiar el proceso de entrenamiento de un practicante de taekwondo, ya sea con fines competitivos o de salud. El diseño metodológico de las investigaciones realizadas en el área debe ser mejorado.

  3. Turnos de trabajo: ¿un factor de riesgo cardiovascular?

    José Santana-Herrera

    2014-03-01

    Full Text Available Objetivos: Describir según la literatura existente si hay evidencia científica de que los turnos de trabajo son un factor de riesgo cardiovascular e identificar las intervenciones en los tipos de turno más efectivas para reducir dichos riesgos. Material y métodos: Se realizó una búsqueda bibliográfica en 10 bases de datos obteniéndose 13 artículos. El diseño de estos estudios fueron: 7 de intervención, 1 de cohortes, 1 casos control, 3 descriptivos transversales y un estudio piloto. Se agruparon los trabajos según la dirección y velocidad de rotación, ergonomía de los turnos y cambios en el número de turnos analizándose la modificación de los biomarcadores según el tipo de intervención. Resultados: La muestra total fue de 12.332 trabajadores. El cambio en la dirección de rotación del turno de trabajo de atrás hacia adelante mostró cambios favorables como disminución del nivel de glucosa, TG, Ác. Úrico y TAS. Rotaciones rápidas en sentido horario pueden ser beneficiosas observándose una disminución del colesterol total, relación colesterol total/LDL y un aumento de HDL. Al asociar la dirección y velocidad de rotación no se obtuvieron modificaciones significativas de los biomarcadores. El cambio ergonómico en los turnos disminuyo las alteraciones lipídicas, TA y FC. Finalmente la diabetes mellitus se vio influenciada negativamente cuando cambiamos de tres turnos a dos turnos de trabajo. Conclusiones: Los artículos publicados sugieren un impacto negativo del trabajo por turnos en el riesgo cardiovascular que puede modificarse favorablemente con cambios en la organización del trabajo (sistema de rotación rápido en sentido horario, turnos flexibles y rotaciones de tres turnos.

  4. Estudio de caso: adaptaciones de acceso al currículum en un alumno de educación infantil con parálisis cerebral.

    Tárraga Mínguez, Raúl

    2012-01-01

    Se presenta el contenido de una intervención con un alumno de educación infantil afectado de parálisis cerebral. La intervención se basa en una adaptación de acceso al currículum consistente en el diseño de tareas y actividades educativas con soporte informático accesible al alumno y adecuadas al nivel curricular propio para su edad y curso académico. Esta metodología garantiza al alumno un acceso al currículum minimizando los efectos de sus problemas de movilidad. This paper exposes the c...

  5. Turno y Eneas en El vencimiento de Turno, de Antonio Manuel del Campo : una Eneida a lo divino

    Echevarren, Arturo

    2007-01-01

    Este artículo analiza las deudas con la Eneida del auto sacramental El vencimiento de Turno (1658), de Antonio Manuel del Campo, atribuido falsamente a Calderón, en el que Eneas representa a Cristo y Turno es trasunto de Lucifer. Tras un repaso de la tradición alegórica de la Eneida y su plasmación en diversos textos, se comentan pasajes significativos del auto protagonizados por Eneas y Turno, que revelan el modelo de reescritura simbólica del autor.

  6. Reescrituras divulgativas del mito cidiano. Descripción y análisis de adaptaciones y versiones contemporáneas representativas del Cantar de Mio Cid.

    Aldo Daparte Jorge

    2014-01-01

    Las polémicas adaptaciones de los clásicos al servicio de los mediadores en la enseñanza literaria o de la divulgación de obras canónicas han generado una literatura en segundo grado marcada por ricas relaciones hipertextuales (Genette). El objetivo de este trabajo es dar una visión panorámica de los elementos textuales y paratextuales implicados en una selección representativa de adaptaciones de la materia cidiana, preferentemente gestadas con intención didáctica, debidamente contextualizada...

  7. Turnos de trabajo: ¿un factor de riesgo cardiovascular?

    José Santana-Herrera; Tony Alfano; Adriana Escobal-Machado

    2014-01-01

    Objetivos: Describir según la literatura existente si hay evidencia científica de que los turnos de trabajo son un factor de riesgo cardiovascular e identificar las intervenciones en los tipos de turno más efectivas para reducir dichos riesgos. Material y métodos: Se realizó una búsqueda bibliográfica en 10 bases de datos obteniéndose 13 artículos. El diseño de estos estudios fueron: 7 de intervención, 1 de cohortes, 1 casos control, 3 descriptivos transversales y un estudio piloto. Se agrupa...

  8. Reescrituras divulgativas del mito cidiano. Descripción y análisis de adaptaciones y versiones contemporáneas representativas del Cantar de Mio Cid.

    Aldo Daparte Jorge

    2014-12-01

    Full Text Available Las polémicas adaptaciones de los clásicos al servicio de los mediadores en la enseñanza literaria o de la divulgación de obras canónicas han generado una literatura en segundo grado marcada por ricas relaciones hipertextuales (Genette. El objetivo de este trabajo es dar una visión panorámica de los elementos textuales y paratextuales implicados en una selección representativa de adaptaciones de la materia cidiana, preferentemente gestadas con intención didáctica, debidamente contextualizadas en la tradición de adaptaciones del Cantar de Mio Cid. Dicho análisis permite comprobar los rasgos específicos que caracterizan este proceso, sustancialmente distinto al seguido en la reescritura de otras obras del canon español, debido a factores como las fuentes histórico-legendarias y literarias de la materia argumental, la forma del relato o su performance.

  9. Adaptaciones de puestos de trabajo de centros de salud en trabajadores especialmente sensibles a riesgos laborales

    Ana Padilla Fortes

    2014-09-01

    Full Text Available Este estudio explora los ajustes trabajo-persona realizados en trabajadores considerados especialmente sensibles a determinados riesgos laborales en el sector sanitario. El propósito de esta investigación fue ayudar a caracterizar las adaptaciones del puesto de trabajo con motivo de la comunicación de algún tipo de discapacidad o limitación de salud que interfiere en el desempeño de tareas. A lo largo del año 2012, en los centros de salud de un distrito de atención primaria se contabilizó un total de 46 trabajadores calificados especialmente sensibles que recibieron un promedio de 3,2 medidas de adaptación en el lugar y/o puesto de trabajo. Los hallazgos mostraron una amplia variedad de ajustes que incluyeron modificaciones en la organización del trabajo, en la forma de desempeñar las tareas, y en menor grado, cambios en los factores ambientales próximos al puesto y/o lugar de trabajo. Todas las medidas estuvieron encaminadas a facilitar la continuidad de la vida laboral dentro de unos límites compatibles con la seguridad y salud del trabajador. Nuestros resultados ofrecen una primera aproximación al conocimiento de los aspectos de gestión de las limitaciones de salud que menoscaban la capacidad de los trabajadores para responder a las demandas de trabajo.

  10. Un caso de insomnio por cambio de turno de trabajo

    Ihab Zubeidat

    2003-01-01

    Full Text Available Un hombre de profesión militar acude a consulta con el fin de recibir ayuda a su problema para iniciar y mantener el sueño, después de seguir un tratamiento farmacológico con zolpidem y clorazepato. Los datos de la evaluación indican que los turnos de trabajo eran la causa principal de su problema. Los diarios de sueño muestran una latencia de sueño media de 70 minutos, presentando varios despertares durante la noche, mostrando un sueño inquieto de un tiempo comprendido entre las dos y tres horas y media diarias. También presenta pensamientos ansiosos relativos a su propio sueño y a su trabajo. Por todo ello, el paciente fue diagnosticado de insomnio por alteración del ritmo circadiano, del tipo de turnos de trabajo. Las recomendaciones terapéuticas fueron poner en marcha un programa de intervención cognitivo-conductual con el objetivo de cambiar los pensamientos desagradables y favorecer los estados de relajación del paciente. Los resultados indican una mejoría en la calidad del sueño como consecuencia del aumento de las horas totales de sueño (4:00– 4:30 horas, la reducción de la latencia del sueño a un tiempo aproximado de 30 minutos y el número de despertares a uno ó ninguno.

  11. Turnos alternantes: fadiga mental de enfermagem Turnos alternantes: fatiga mental en enfermería Shift schedule: mental fatigue in nursing

    Maria Helena Palucci Marziale

    1995-01-01

    Full Text Available O objetivo do presente estudo foi detectar sintomas e sinais de fadiga mental, em enfermeiras atuantes em instituição hospitalar com esquema de trabalho em turnos alternantes, através de um indicador subjetivo "check-list" e dos indicadores objetivos Freqüência Crítica de Fusão da luz (Flicker e Tempo de Reação simples a estímulo auditivo (TRs. Foram analisadas, 5 jornadas consecutivas trabalhadas nos turnos: manhã, tarde e noite por 12 enfermeiras de três unidades de internação diferentes de um hospital universitário. Os resultados sugerem que a alternância existente entre os turnos é prejudicial à saúde e à vida sócio-familiar e profissional dessas enfermeiras, as quais revelaram insatisfação pelo esquema de trabalho e apresentaram sintomas e sinais de fadiga mental. A incidência dos sintomas foi maior no turno da noite que no turno da manhã, a qual foi maior que a do turno da tarde quando comparados os valores obtidos no início e final dos turnos, evidenciando-se com maior freqüência os sintomas de embotamento e distúrbios do sono. Indícios de fadiga foram detectados através do Flicker na seguinte ordem: turno da manhã maior que o da noite, o qual foi maior que o da tarde, quando comparados os valores no início de final dos turnos. Em contrapartida, na verificação do tempo de Reação simples, os indícios de fadiga foram apresentados no turno da noite em freqüência maior que a do turno da manhã, o qual foi maior que a da tarde.El objetivo del presente estudio fue detectar síntomas y señales de fatiga mental, en enfermeras actuantes en instituciones hospitalarias con esquema de trabajo en turnos alternantes, a través de un indicador subjetivo "check-list" y de los indicadores objetivos Frecuencia Crítica de Fusión de la luz (Flicker y Tiempo de Reacción simple a estímulo auditivo (TRs Fueron analizadas, 15 jornadas consecutivas trabajadas en los turnos mañana, tarde y noche por 12 enfermeras de

  12. Structure of claws and toes of two tropidurid lizard species of Restinga from Southeastern Brazil: adaptations to the vertical use of the habitat Estructura de garras y dedos en dos lagartos tropidúridos de Restinga, sureste de Brasil: adaptaciones al uso vertical del hábitat

    Sueli Carvalho Ribas

    2004-12-01

    Full Text Available Tropidurus torquatus and Liolaemus lutzae, found in a restinga habitat, show some morphological differences associated with differential microhabitats use. There were made measurements of the snout-vent length, length and width of the largest toe of hand and foot, and length, width, height and curvature of the claws. We counted the number of adhesive lamellae of the largest toe of each member. T. torquatus has larger toes, greater number of adhesive lamellae and higher and more curve claws than L. lutzae. No significant differences in toe and claw widths were found. These results suggest that the differences found in the morphology of toes and claws of these two species would be associated with the differential microhabitat use. T. torquatus has morphological adaptations that allow it to use the microhabitat both vertically or horizontally, while L. lutzae use it only horizontallyTropidurus torquatus y Liolaemus lutzae hallados en un hábitat de restinga, muestran algunas diferencias morfológicas asociadas a el uso diferencial de microhábitats. Se realizaron mediciones de la longitud "snout-vent", longitud y ancho del dedo mayor de la mano y el pie y, longitud, ancho, altura y curvatura de las garras. Se contó el número de lamelas adhesivas del dedo mayor de cada miembro. T. torquatus posee dedos más grandes, mayor número de lamelas adhesivas y garras más altas y curvadas que L. lutzae. No se hallaron diferencias significativas en los anchos de dedos y garras. Estos resultados sugieren que las diferencias encontradas en la morfología de dedos y garras de estas dos especies estarían asociadas con el uso diferencial del microhábitat. T. torquatus posee adaptaciones que le permiten utilizar el microhábitat tanto vertical como horizontalmente, mientras que L. lutzae solamente lo utiliza en forma horizontal

  13. Adaptaciones curricularespara alumnos con baja visión e invidentes

    Rodríguez Fuentes, Antonio

    2003-01-01

    RESUMEN: El propósito del artículo es describir algunas adaptaciones curriculares de contexto, centro, aula e individuales para favorecer la integración de alumnos con baja visión e invidentes en el marco de una Escuela Inclusiva. Consciente de que la precisión disminuye en función de la jerarquía establecida: contexto, centro, aula y adaptaciones individuales (como no podía ser de otra manera dado que en ese orden aumenta el grado de singularidad y heterogeneidad de la población analizada; e...

  14. Adaptaciones curriculares para alumnos con baja visión e invidentes

    Rodríguez Fuentes, Antonio

    2003-01-01

    El propósito del artículo es describir algunas adaptaciones curriculares de contexto, centro, aula e individuales para favorecer la integración de alumnos con baja visión e invidentes en el marco de una Escuela Inclusiva. Consciente de que la precisión disminuye en función de la jerarquía establecida: contexto, centro, aula y adaptaciones individuales (como no podía ser de otra manera dado que en ese orden aumenta el grado de singularidad y heterogeneidad de la población analizada; ...

  15. Trabalho em turnos e dimensões sociais: um estudo na indústria têxtil

    Ana Isabel Ferreira

    2013-09-01

    Full Text Available O trabalho em turnos tem sido associado a diversas consequências na vida dos trabalhadores. Este estudo analisa as consequências do trabalho em turnos ao nível familiar, social e organizacional e de que forma tais dimensões podem interferir na adaptação a estes horários. Foi utilizada uma amostra de 239 trabalhadores de uma empresa têxtil portuguesa, distribuídos pelos seguintes horários: convencional (08h-12h30/13h30-17h, 1º turno (06h/14h; turno da manhã, 2º turno (14h/22h; turno da tarde e 3º turno (22h/06h; turno da noite. Na coleta de dados foi usado um questionário para avaliar, entre outros aspectos, a relação do horário de trabalho com a vida conjugal, a vida social ou o apoio da empresa. Os resultados apontam para uma preferência dos trabalhadores relativamente ao 1º turno, tendo este obtido os melhores scores em todos os aspectos. O horário convencional, por sua vez, apresenta os scores mais reduzidos. Genericamente, os resultados apontam para a importância de dimensões sociais na gestão do tempo de trabalho.

  16. Adaptaciones curriculares: Convergencias y divergencias de su implementación en el profesorado chileno

    Braulio Ademir Navarro-Aburto

    2016-01-01

    Full Text Available Recibido 13 de marzo de 2015 • Corregido 29 de octubre de 2015 • Aceptado 17 de noviembre de 2015La presente investigación describe el proceso que se realiza para llevar a cabo las adaptaciones curriculares, en la asignatura de matemática para el alumnado que presenta algún tipo de necesidad educativa especial transitoria. Se ha considerado la coordinación existente entre docentes de Matemática y de Educación Diferencial, como acción promotora de las adaptaciones curriculares. La metodología utilizada corresponde a la cualitativa con un enfoque fenomenológico, y la principal técnica de recolección de datos fue la entrevista semiestructurada, participantes de este estudio fueron 10 docentes de 2 instituciones educativas con programa de integración. Los principales hallazgos arrojan que profesorado y personal encargados del Programa de Integración Escolar cumplen con las normativas y requerimientos  del Decreto Nº 170 en relación con las adaptaciones curriculares, pero dicho cumplimiento está sujeto a la informalidad en la articulación y planificación debido a la falta de tiempo y recursos disponibles. De este modo, como conclusión se plantea que existe una necesidad constante de adaptaciones curriculares, pues son un mecanismo que permite lograr la individualización de la enseñanza, mejorando la calidad de vida y la educación especial en Chile.

  17. Trabalho em turnos: estado geral de saúde relacionado ao sono em trabalhadores de enfermagem

    Sandra Soares Mendes

    2012-12-01

    Full Text Available O objetivo deste estudo foi identificar os sintomas referentes ao estado geral de saúde associado ao trabalho em turnos de enfermagem e relacioná-los com a qualidade do sono. O estudo foi realizado no Hospital da Irmandade da Santa Casa de Poços de Caldas, Minas Gerais. Participaram 136 profissionais de enfermagem, com média de idade de 33,1 anos, divididos nas seguintes categorias: enfermeiro (8,1%; técnico de enfermagem (80,9%; auxiliar de enfermagem dos turnos diurno e noturno (11%. Os sintomas de saúde foram identificados a partir do Inventário de Estado Geral de Saúde, e a qualidade do sono foi avaliada pelo Diário do Sono. Os dados foram estatisticamente significativos pelo Teste Qui-Quadrado (p=0,021 para a presença do sintoma de flatulência ou distensão abdominal no turno noturno. Constatou-se com a análise de regressão linear múltipla que os sujeitos do turno diurno que apresentaram os sintomas de má digestão (às vezes ou sempre e irritabilidade (sempre tiveram pior qualidade de sono noturno.

  18. Efecto de la implantación de turnos de enfermería «a demanda» sobre las horas de absentismo Effect of the introduction of "on demand" nursing shifts on hours of absenteeism

    Joaquín Jesús Blanca Gutiérrez

    2012-10-01

    Full Text Available El objetivo de esta experiencia es estudiar la influencia en el absentismo del personal de enfermería de un nuevo sistema de turnos rotatorios, con la novedad de que tanto la distribución horaria como la planificación y la adjudicación de los turnos se ha hecho según las demandas del propio personal. El lugar de realización ha sido el Hospital Infanta Margarita, de Cabra (Córdoba, España, y la implementación de los nuevos turnos fue durante el primer trimestre de 2011. De un total de 5551 horas absolutas de ausencia por semestre, se ha pasado a 3289 horas. La implantación de este nuevo sistema de turnos «a demanda» parece haber conseguido una reducción notable en el número de horas de ausencia del trabajo. Se trata de una estrategia para tratar de conciliar al máximo la jornada laboral con la vida personal y familiar.The objective of this study was to analyze the effect of the introduction of a new system of rotating shifts on nursing absenteeism. The novelty of this system is that both the time distribution and the planning and allocation of shifts is carried out according to the wishes of the participating nurses. This study was performed in the Infanta Margarita Hospital (Cordoba, Spain and the new shift system was introduced in the first quarter of 2011. The total number of absolute hours of absence decreased from 5551 to 3289 per semester. The implementation of this new "on demand" shift system seems to have significantly reduced hours of absence. This strategy aims to reconcile nurses´ working hours with their personal and family lives.

  19. Work in Rotating Shifts and its Effects on the Daily Life of Grain Processing Workers El trabajo en turnos alternados y sus efectos en lo cotidiano del trabajador que beneficia granos O trabalho em turnos alternados e seus efeitos no cotidiano do trabalhador no beneficiamento de grãos

    Mariana Roberta Lopes Simões

    2010-12-01

    Full Text Available This study aimed to investigate the effects of alternating shift work in the daily life of grain processing workers. A quantitative data collection research was carried out at a grain processing company in Goiás - Brazil. Research participants were 53 alternating shift workers. A questionnaire was developed and used for data collection, based on the principles of chronobiology and Pittsburgh Sleep Quality Index, with 31 closed and one open question. The result showed dissatisfactory sleep quality for approximately 50% of the participants. The most evidenced physiological changes referred to the digestive tract. As for behavioral aspects, irritability was highlighted. Among the research participants, 70% considered that their work hours affect their leisure and social life. In conclusion, negative manifestations exist in the daily life of people working in alternating shifts, which can affect their physical, mental and social health.Se tuvo por objetivo identificar los efectos del trabajo en turnos alternados en lo cotidiano de los trabajadores que benefician granos. Fue realizada una investigación de recolección de datos con abordaje cuantitativo en una empresa de beneficio de granos en Goiás - Brasil. Participaron de la investigación 53 trabajadores de turnos alternados. Fue elaborado y utilizado un cuestionario para la recolección de datos, basado en los principios de la cronobiología y en el Índice de Calidad del Sueño de Pittsburgh, con 31 preguntas cerradas y una abierta. El resultado evidenció que la calidad del sueño no es satisfactoria para 50% de los participantes. Las alteraciones fisiológicas más evidenciadas se refirieron al tracto digestivo. En cuanto a los aspectos de comportamiento, la irritabilidad fue destacada. De los investigados, 70% consideraron que el descanso y la vida social quedan perjudicados por el horario de trabajo. Se concluye que existen manifestaciones negativas en lo cotidiano de personas que

  20. Collimator with compensated filtration: clinical adaptation for recommendation 4f of the EU about the radiation protection in oral dental radiology; Colimador con filtracion compensada: adaptacion clinica para alcanzar la recomendacion 4F de la Union Europea sobre proteccion radiologica al paciente en radiologia odontologica

    Alcaraz, M.; Garcia-Vera, C.; Bravo, C. La; Morant, J. J.; Armedo, D. Y.; Canteras, M.

    2006-07-01

    Recent recommendations by the European Union (2004) for performing lateral cranial cephalometry (LCC) state that collimation should be maximized so that only those tissues necessary are irradiated when performing clinical diagnoses, although the fact that many manufacturers do not incorporate these elements in their equipment design has been recognised (recommendations 4f). Aim: the manufacture and utilization of a collimator with a pre-patient compensating filter for LLC which may be used in most extraoraldental radiology units, as well as determining the reduction in the dose of radiation absorbed by more sensitive tissues exposed to said clinical exploration. Making use of mannequins, phantom and craniums, we constructed a collimator with a compensating filter and established the necessary technical, dosimetric and quality specifications for its clinical use. Subsequently, we studied 16 patients referred for cephalometric study, determining the radiation dose (TLDs) in both the patients (crystalline lens, frontal lobe, parotid/submaxillary/thyroid glands and brain) and in the radiographic film, as well as in different parts of the collimator/filter. Al presented we are aiming for its clinical use by carrying out LCC in another 16 patients referred of orthodontic treatment but with the pre-a patient introduction of the tested collimator with the compensating filter as a substitute for the usual technique. The collimation reduced the field or radiation by some 40% and with that, so too the radiated tissues. The compensating filter reduced the dose in tissues by some 34.2. Our collimator has allowed the radiological image to be obtained with only one third the usual radiation dose. The dose reaching the film shies only between 17% less than in the usual technique and didn't alter its diagnostic capacity. A reduction of 61,6% of the dose administered to the patient is achieved by incorporating the collimator and filter to most radiological equipment without the

  1. Trabalho em Turnos Noturnos: Implicações na Qualidade de Vida Profissional e Pessoal dos Trabalhadores

    Nelsio Rodrigues de Abreu

    2012-12-01

    Full Text Available A sociedade altera seus hábitos de vida constantemente e, frente a isso, as empresas buscam atender às necessidades do consumidor durante 24 horas por dia, fazendo uso do trabalho noturno para atingir a essas expectativas. O presente estudo teve como objetivo verificar as implicações do trabalho noturno na qualidade de vida dos trabalhadores de Maceió/AL. Este foi caracterizado como exploratório. A população da pesquisa foram os trabalhadores do turno noturno de bares, restaurantes e hotéis de Maceió (385 respondentes. O instrumento de coleta de dados foi um questionário estruturado e utilizado SPSS para análise estatística. Nos resultados obtidos, destacam-se, no que diz respeito ao perfil dos respondentes, os índices de pessoas solteiras que possuem filhos e mantêm uma união estável com seus parceiros e o baixo nível de escolaridade da maioria, o que influencia proporcionalmente na renda mensalmente, sendo esta composta também pelo adicional financeiro. Verificou-se também que o intervalo de descanso no decorrer da jornada de trabalho não é proporcionado aos colaboradores, evidenciando o descumprimento do Artigo 71 da Consolidação das Leis do Trabalho, entre outros achados.

  2. Análisis no determinista del turno óptimo en plantaciones de E. globulus

    Díaz Balteiro, Luis; Rodríguez, L. C. E.

    2007-01-01

    El método de beneficio de monte bajo habitualmente utilizado para el manejo de plantaciones de Eucalyptus globulus Labill conduce a un problema de optimización conjunto: el gestor debe elegir el turno óptimo en cada rebrote, y el número óptimo de rebrotes hasta que se vuelva a replantar. Esta circunstancia obliga a utilizar métodos como la programación dinámica para obtener la solución óptima. En este trabajo se presenta la metodología apropiada para resolver este p...

  3. Riesgo de los turnos nocturnos en la salud integral del profesional de enfermería

    Noé Ramírez-Elizondo; Tatiana Paravic-Klijn; Sandra Valenzuela-Suazo

    2013-01-01

    Objetivo: describir el riesgo de los turnos nocturnos en la salud integral del profesional de Enfermería. Se realizó una revisión en diversas bases de datos, y de ahí se extrajo lo más relevante para la construcción de la información contenida. Se establece que los principales trastornos asociados a los trabajos de noche giran en torno a problemas gástricos, y del sistema cardiovascular. De igual manera hay importantes alteraciones asociadas a la pérdida del vínculo familiar y la interacción ...

  4. Adaptaciones curricularespara alumnos con baja visión e invidentes

    Antonio RODRÍGUEZ FUENTES

    2009-11-01

    Full Text Available RESUMEN: El propósito del artículo es describir algunas adaptaciones curriculares de contexto, centro, aula e individuales para favorecer la integración de alumnos con baja visión e invidentes en el marco de una Escuela Inclusiva. Consciente de que la precisión disminuye en función de la jerarquía establecida: contexto, centro, aula y adaptaciones individuales (como no podía ser de otra manera dado que en ese orden aumenta el grado de singularidad y heterogeneidad de la población analizada; en definitiva, las necesidades educativas especiales se hacen más individuales y demandan una completa y compleja evaluación psicopedagógica, se presentan algunas pautas más o menos genéricas que pueden resultar útiles para la realización de la evaluación psicopedagógica, primero, y, segundo, para la determinación de propuestas de intervención escolares (adaptaciones.ABSTRACT: This paper is aimed to describe, in the framework of inclusive school, some curricular adaptation related both to context (school and classroom level and to pupil with low-vision or blindness. Been aware of needed herarchy in adapting curriculum top-down so that special educational needs become more and more individualized, some guidelines are displayed related to psychoeducational assessment and intervention in school context.RÉSUMÉ: Le but de l'article est de décrire certaines adaptations curriculaires de contexte, de centre, salle de classe et individuelles pour favoriser l'intégration d'étudiants malvoyant et aveugles dans le cadre d'une École Incluse. Conscient que la précision diminue en fonction de la hiérarchie établie: le contexte, le centre, la salle de classe et les adaptations individuelles (car elle ne pourrait pas être autre puisque dans cet ordre il augmente le degré de singularité et d'hétérogénéité de la population analysée; par conséquent, les nécessités éducatives spéciales sont rendues plus individuelles et exigent une

  5. Videojuego de rol táctico de estética retro basado en combates por turnos

    García García, Juan de la Cruz

    2010-01-01

    Videojuego de rol basado en combates por turnos con estética retro, de nombre comercial TierraCuadrada, donde el jugador podrá llevar a cabo partidas en modo historia, involucrando combates con la Inteligencia Artificial, y partidas contra rivales humanos.

  6. Clásicos y modernos: dos adaptaciones literarias de Orson Welles

    Molina Foix, Vicente

    2010-02-01

    Full Text Available The main purpose of this paper is to study the importance of Orson Welles as filmmaker in two different ways. Firstly, as regards his adaptations from Shakespeare’s texts. Among these Macbeth, focusing mainly on Jacques Tourner’s influence with his work I walked with a Zombie and the strategies used to build a film using fantastic terror clues. In the second part of the paper, Welles is studied in relation to his interest in Isak Dinesen’s work and his adaptation from The Inmortal Story.

    Se estudia la trayectoria cinematográfica de Orson Welles con especial referencia a las adaptaciones de las obras de Shakespeare y dentro de ellas Macbeth, destacando la influencia de Jacques Tourner con su obra Yo anduve con un Zombie y construyendo su obra con los parámetros del cine de terror fantástico. Se describe el interés de Wells por la obra de Isak Dinesen y su adaptación de Una historia inmortal.

  7. Adaptaciones musculares relacionadas a áreas corporales que participan activamente en el vuelo de Anhima cornuta (Aves: Anseriformes, Anhimidae)

    Marcos Antonio Manzanares

    2013-01-01

    La forma y correspondencia entre la anatomía muscular y ósea revela en gran medida el hábito locomotor de cualquier ave. Las especies pertenecientes a la Familia Anhimidae son relevantes dentro de las Aves, debido a las adaptaciones óseas (y por lo tanto, musculares) que presentan, como la pérdida de procesos uncinados, el desarrollo de espolones metarcapales, la extrema neumatización y el notable desarrollo de forámenes. Se analizaron anatómicamente y numéricamente (superficie de origen ...

  8. Flexibilidad, jornada laboral y sistemas de turnos: Efectos de la legislación en empleo y producto

    Pablo González; Alejandra Mizala; Pilar Romaguera

    2000-01-01

    La flexibilización del mercado del trabajo es un requisito para lograr mayores niveles de empleo y conseguir una mejor adaptación de la fuerza de trabajo a las cambiantes condiciones económicas. Este artículo identifica las restricciones que impone la normativa laboral chilena respecto a la jornada laboral, en especial en el tema del trabajo en turnos continuos, y considera el impacto que podrían tener cambios en esta legislación sobre distintas variables económicas, como el empleo y el produ...

  9. Trabalho por turnos na indústria: alterações do ciclo sono-vigília e impacto no quotidiano, individual e social, dos trabalhadores

    Alves, Bartolomeu Tiago Rasteiro

    2013-01-01

    Resumo O trabalho por turnos pode provocar dessincronizações dos ciclos biológicos endógenos, como o ciclo sono/vigília. Esta desorganização do ritmo circadiano do sono, assim como de outros ritmos biológicos, provocado pelo trabalho por turnos e noturno, podem levar a sérios comprometimentos das funções fisiológicas e psicológicas, afetando a qualidade de vida do trabalhador. Associando outros riscos inerentes à atividade profissional, como o ruído e a iluminação, poder-se-á culminar em c...

  10. Efecto de la administración de antioxidantes orales en las adaptaciones al ejercicio físico.

    Doménech de Antonio, Elena

    2006-01-01

    RESUMEN Durante el ejercicio físico se producen radicales libres en el interior de la célula muscular. Éstos pueden actuar como señales reguladoras en diversas funciones fisiológicas del músculo, como por ejemplo su fuerza contráctil, su capacidad para generar ATP, etc Se sabe que el entrenamiento aeróbico empleando una determinada frecuencia, intensidad y duración, puede aumentar el contenido mitocondrial entre un 50% y un 100% en un período aproximado de seis semanas. E...

  11. Ansiedade, depressão e burnout em enfermeiros: Impacto do trabalho por turnos Ansiedad, depresión y burnout en enfermeros: Impacto de trabajo por turnos Anxiety, depression and burnout in nurses: Impact of shift work

    Vanessa Oliveira

    2012-07-01

    Full Text Available O objetivo deste trabalho foi conhecer os níveis de ansiedade, depressão e burnout em enfermeiros que trabalham por turnos. A recolha de dados foi realizada através de um questionário que engloba dois instrumentos previamente traduzidos e validados para a população portuguesa: Hospital Anxiety and Depression Scale (HADS e Maslach Burnout Inventory (MBI. Este questionário foi aplicado antes e após o turno da tarde. Em ambos os momentos, os inquiridos obtiveram níveis médios de exaustão emocional e baixos níveis de realização pessoal e de despersonalização (MBI. Relativamente à ansiedade e à depressão, os valores obtidos foram compatíveis com um nível moderado de ansiedade e ligeiro de depressão (HADS. Não se encontraram diferenças estatisticamente significativas (dos níveis de ansiedade, depressão e burnout do primeiro para o segundo momento de avaliação. É fundamental que o profissional de saúde responsável pela gestão esteja desperto para estas questões, podendo, assim, adotar medidas preventivas.El objetivo de este trabajo se centró en conocer los niveles de ansiedad, depresión y burnout en enfermeras que trabajan por turnos. La recolección de datos se realizó mediante la elaboración de un cuestionario que incluyó dos instrumentos previamente traducidos y validados para la población portuguesa: Hospital Anxiety and Depression Scale (HADS y Maslach Burnout Inventory (MBI. Este cuestionario fue aplicado antes y después del turno de la tarde. En ambos momentos, los participantes obtuvieron niveles promedio de agotamiento emocional, niveles bajos de realización personal y de despersonalización (MBI. Con respecto a la ansiedad y la depresión, los valores obtenidos concuerdan con un nivel moderado de ansiedad y de depresión leve (HADS. No se observaron diferencias estadísticamente significativas (de niveles de ansiedad, depresión y burnout entre la primera y segunda etapa de evaluación. Es esencial que

  12. An evolutionary frame of work to study physiological adaptation to high altitudes Un marco conceptual para estudiar adaptaciones fisiológicas a altas altitudes

    ENRICO L. REZENDE

    2005-06-01

    Full Text Available How complex physiological systems evolve is one of the major questions in evolutionary physiology. For example, how traits interact at the physiological and genetic level, what are the roles of development and plasticity in Darwinian evolution, and eventually how physiological traits will evolve, remains poorly understood. In this article we summarize the current frame of work evolutionary physiologists are employing to study the evolution of physiological adaptations, as well as the role of developmental and reversible phenotypic plasticity in this context. We also highlight representative examples of how the integration of evolutionary and developmental physiology, concomitantly with the mechanistic understanding of physiological systems, can provide a deeper insight on how endothermic vertebrates could cope with reduced ambient temperatures and oxygen availability characteristic of high altitude environments. In this context, high altitude offers a unique system to study the evolution of physiological traits, and we believe much can be gained by integrating theoretical and empirical knowledge from evolutionary biology, such as life-history theory or the comparative method, with the mechanistic understanding of physiological processesUna de las preguntas más importantes en fisiología evolutiva es como evolucionan los sistemas fisiológicos complejos. Por ejemplo, actualmente sabemos poco sobre la interacción entre varios rasgos a niveles genéticos y fisiológicos, sobre el papel de la plasticidad fenotípica durante distintas etapas del desarrollo y madurez para la evolución fisiológica dentro de un linaje. En este trabajo explicamos el marco conceptual ocupado por fisiólogos evolutivos en la actualidad para estudiar adaptaciones fisiológicas a nivel evolutivo y el papel de la plasticidad dentro de la evolución Darviniana. Citamos ejemplos de como la integración de la fisiología evolutiva y del desarrollo nos permitió un mayor

  13. Análise das funções cognitivas e sono na equipe de enfermagem nos turnos diurno e noturno Análisis de la función cognitiva y el sueño en el equipo de enfermería en los turnos de el día y nocturno Analysis of cognitive function and sleep of nursing staff on different shift work

    Beatriz Oliveira; Milva Maria Figueiredo De Martino

    2013-01-01

    Este estudo teve como objetivo analisar a memória de curto prazo, a atenção e o padrão do sono na equipe de enfermagem nos turnos diurno e noturno. Participaram 109 sujeitos de uma instituição hospitalar de Minas Gerais, distribuídos nos turnos: diurno (n= 68) e noturno (n=41). Utilizou-se, para coleta de dados: Diário de sono e Testes da Bateria WAIS III. Os resultados para a medida da qualidade do sono dos sujeitos do turno noturno apresentou diferença significativa (p

  14. Dieta y adaptaciones ecológicas de las poblaciones humanas del Pleistoceno Medio y Superior

    Pinilla Pérez, Beatriz

    2012-01-01

    Durante el Pleistoceno Medio y Superior ocuparon Europa al menos tres poblaciones: los heidelbergensis, los neandertales y los humanos modernos. La economía de estas sociedades habría dependido en última instancia de los recursos vegetales y animales disponibles, que habrían variado según las oscilaciones climáticas a lo largo de los 600 Ka en que el continente fue ocupado de manera continua. La variación en la dieta implicaría un cambio en las estrategias de subsistencia que podrían haber te...

  15. Adaptaciones musculares relacionadas a áreas corporales que participan activamente en el vuelo de Anhima cornuta (Aves: Anseriformes, Anhimidae

    Marcos Antonio Manzanares

    2013-04-01

    Full Text Available La forma y correspondencia entre la anatomía muscular y ósea revela en gran medida el hábito locomotor de cualquier ave. Las especies pertenecientes a la Familia Anhimidae son relevantes dentro de las Aves, debido a las adaptaciones óseas (y por lo tanto, musculares que presentan, como la pérdida de procesos uncinados, el desarrollo de espolones metarcapales, la extrema neumatización y el notable desarrollo de forámenes. Se analizaron anatómicamente y numéricamente (superficie de origen e inserción, longitud en reposo y masa los componentes musculares relacionados a las zonas de la columna vertebral, tronco, miembros y cinturas de tres ejemplares de Anhima cornutade distintos sexos y se compararon con lo estudiado en 4 ejemplares de especies relacionadas (Dendrocygna bicolory Dendrocygna viduata, Anatidae. El estudio reveló que en Anhima existe un gran desarrollo de los músculos intercostales e intervertebrales (torácicos y lumbares, evidenciando una adaptación a la ausencia de procesos uncinados. En Anhimaexisten fascículos proporcionalmente menos pesados y de menor tamaño que en Dendrocygna, indicando morfológicamente la ocurrencia de un vuelo menos desarrollado en el primero. Algunos tendones y fibras musculares metacarpales cuya inserción ocurre en el primer dígito en Dendrocygna, en Anhimase insertan en la base de los espolones proximal y distal, demostrando el poco control del vuelo en Anhima. La musculatura de los miembros posteriores en Anhimaes mucho más desarrollada, tanto en tamaño, como en masa proporcional, evidenciando una gran actividad en esta zona en la propulsión del vuelo y en hábitos terrestres

  16. Diseño y automatización de máquina rotativa para la fabricación de rollos de turno

    Sánchez Martín, Andrés

    2012-01-01

    El objetivo de este proyecto final de carrera es doble, por una parte es el diseño de una nueva máquina para la fabricación de rollos de turno junto con el actual personal de la empresa y por otro lado es el control y automatización del sistema electrónico de la máquina,este será el objetivo exclusivo del alumno ya que esta especializado en electrónica industrial,y en la empresa no hay ningún otro empleado de esta especialidad.

  17. Influência do turno de trabalho e cronotipo na qualidade de vida dos trabalhadores de enfermagem Influencia del trabajo por turnos y cronotipo en la calidad de vida de los profesionales de enfermería Influence of work shift and chronotype on the quality of life of nursing professionals

    Sônia Beatriz Coccaro de Souza

    2012-12-01

    Full Text Available O objetivo do estudo foi verificar a influência do turno de trabalho e cronotipo na qualidade de vida dos trabalhadores de enfermagem de um hospital universitário do Rio Grande do Sul, através de um delineamento transversal e analítico, realizado com 101 trabalhadores de enfermagem, que atuavam em unidades clínicas e cirúrgicas de internação de adultos. O cronotipo e a qualidade de vida foram avaliados por meio do Questionário de Matutinidade-Vespertinidade de Horne-Östberg e pelo WHOQOL-Breve. Nenhum dos domínios do WHOQOL-Breve apontou associação ao turno (p>0,05, mas se verificou que os indivíduos com cronotipos concordantes com o turno em que trabalhavam (67,01±10,8 demonstraram média superior aos discordantes (59,16±14,67, quanto ao domínio "meio ambiente" do WHOQOL (p=0,03. Assim, foi evidenciado que a concordância cronobiológica com o turno de trabalho pode se constituir como um fator de qualidade de vida para a equipe de enfermagem.El objetivo del estudio fue investigar la influencia del trabajo por turnos y el cronotipo en la calidad de vida del personal de enfermería de un hospital universitario en Rio Grande do Sul. Es un estudio transversal, realizado con 101 personas del equipo de enfermería que trabajaba en unidades clínicas y quirúrgicas con enfermos adultos. El cronotipo y calidad de vida se evaluó mediante las escalas de Horne y Östberg y el WHOQOL-Breve, respectivamente. Ninguno de los dominios del WHOQOL breve tuvo asociación con calidad de vida (p> 0,05. Los sujetos con cronotipo en conformidad con el turno en el que trabajan (67,01 ± 10,8 tuvieron mayor promedio que los discordantes (59,16 ± 14,67 en el campo del WHOQOL-Breve que evalúa el medio ambiente (p = 0,03. Por lo tanto, se evidenció que la concordancia con el cronotipo con el turno de trabajo se puede constituir en un factor de calidad de vida para el personal de enfermería.The purpose of this study was to investigate the influence of

  18. A influência do turno de trabalho em pacientes com diabetes mellitus tipo 2 The influence of the work shift in patients with type 2 diabetes

    Ticiana C. Rodrigues

    2008-04-01

    Full Text Available OBJETIVOS: O objetivo deste estudo foi investigar a relação entre trabalho em turnos e pacientes diabéticos tipo 2. MÉTODOS: Um estudo transversal foi realizado em uma coorte de 95 pacientes diabéticos que trabalham no Hospital de Clínicas de Porto Alegre. Os pacientes foram divididos em dois grupos de acordo com o turno de trabalho noturno e diurno. Os pacientes foram submetidos à avaliação clínica e laboratorial. RESULTADOS: Não houve diferença significativa em relação à idade, sexo, duração do diabetes, índice de massa corporal, glicemia de jejum, teste A1c, triglicerídeos, colesterol total, LDL colesterol, HDL colesterol, creatinina sérica e ácido úrico. Maior média de circunferência abdominal foi encontrada no grupo de trabalhadores noturnos. CONCLUSÃO: A circunferência abdominal foi mais elevada no grupo de trabalhadores noturnos. Isto pode ser um indicativo de maior resistência insulínica neste grupo de pacientes. Nossa pesquisa indica que o trabalho em turnos não esta associado com piora no controle metabólico em indivíduos diabéticos, nem com a presença de nefropatia diabética.OBJECTIVE: This study aimed to investigate the relationship between the work shift and diabetic patients. METHODS: A cross-section study was performed in a cohort of 95 type 2 diabetic patients that work in the Hospital de Clinicas de Porto Alegre. Patients were divided into 2 groups according to the shift, day or night work. Patients underwent clinical and laboratory evaluations. RESULTS: There were no significant differences in age, gender, diabetes duration, body mass index, blood pressure, fasting glucose, A1c (1%, triglycerides, total cholesterol, LDL cholesterol, HDL cholesterol, serum creatinine and uric acid. A higher average of waist circumference was found in the group of night workers. CONCLUSION: Waist circumference was greater in the group of night workers; which may be indicative of insulin resistance in this group

  19. FUNCIONAMIENTO FAMILIAR DE TRABAJADORES-JEFES DE HOGAR EN SISTEMA DE TURNOS DE UNA EMPRESA DE TALCAHUANO, CHILE, AÑO 2003 FAMILY MANAGEMENT OF HOUSEHOLDER WORKERS IN A SHIFT SYSTEM IN A TALCAHUANO’S ENTERPRISE, CHILE, 2003

    JUAN RETAMALES HORMAZÁBAL

    2004-06-01

    Full Text Available Estudio descriptivo relacional de corte transversal, cuyo propósito fue analizar la percepción del funcionamiento familiar de los trabajadores jefes de hogar en sistemas de turnos rotativo, su pareja y un hijo adolescente. El universo estuvo constituido por el total de los trabajadores en sistemas de turno de la empresa. La muestra fue 142 familias de trabajadores que reunían las características para el estudio, 59 familias constituyeron la unidad de análisis. Para recolectar los datos se utilizó el instrumento "Cómo es tu familia, cómo es su familia", de Hernández A. Los ítemes con significación estadística que resultaron predictores del funcionamiento familiar fueron: Comunicación padre-madre-adolescente, y sus cuatro dimensiones, Afrontamiento de problemas global, Búsqueda de apoyo social, Esfuerzo personal, Poder-dinero y sexo, Satisfacción global, Satisfacción con la vida, y Rendimiento académico/laboral. Existieron ítemes sin significación estadística pero que pueden constituirse en predictores de riesgo por su condición de déficit. El funcionamiento familiar de las familias estudiadas es bueno aunque no óptimo. Se destaca como grupo socialmente privilegiado al compararlos con la población media de trabajadores del país, dado sus condiciones económicas, educacionales y culturales, además de un gran apoyo laboral. Los hallazgos indican que en la gran mayoría de los factores existe una tendencia a agruparse en rangos de media-baja vulnerabilidad o riesgo, que implican una baja alteración del funcionamiento familiar.A descriptive relational and cross section study whose aim is to analyze the perception of the family management of householder workers in rotating shift systems, his/her spouse and a teenager son/daughter. The universe consists of the amount of workers in a plant shift system. The sample was 142 families of workers which had the characteristics for the study, being 59 families considered as analysis

  20. Riesgo de cáncer de mama en trabajadoras de turno nocturno Breast cancer risk in night female workers

    Francisco Javier Fresneda Moreno

    2013-03-01

    Full Text Available Los estudios epidemiológicos más recientes a nivel mundial han puesto de manifiesto una asociación entre el trabajo nocturno (15-20% de los trabajadores y un aumento del riesgo de cáncer de mama, siendo esta, una patología de gran prevalencia y la primera causa de neoplasia en el sexo femenino. En el año 2007, la IARC consideró el trabajo nocturno como probable cancerígeno (categoría 2A. Los turnos nocturnos producen una disrupción del ritmo circadiano. La exposición a la luz artificial nocturna inhibe la síntesis de melatonina aumentando el estímulo estrogénico, e inhibiendo el efecto antimitótico, antiangiogénico y antioxidante de esta hormona, aumentando así el riesgo tumoral. Los objetivos son: identificar la evidencia científica existente entre la asociación trabajo nocturno y cáncer de mama, los factores intrínsecos/extrínsecos que pueden modificar la asociación causal, conocer desde el punto de vista científico la sostenibilidad de la melatonina en la chrono-disrupción y los factores de vulnerabilidad. Se ha realizado la búsqueda bibliográfica de artículos publicados entre 2006-diciembre 2012 (exceptuando un meta-análisis del 2005, en las siguientes bases datos: Medline, Wok, Lilacs, OSH, IBECS, Cochrane, Scopus y Embase. Se seleccionaron por nivel de evidencia y criterios de inclusión-exclusión un total de 15 artículos. Se sugiere la existencia de una asociación no concluyente entre el riesgo de cáncer de mama y trabajo nocturno, por lo que se deben seguir realizando estudios más precisos en diferentes tipos de profesiones, etnias, minimizando la posibilidad de sesgos.Recent epidemiological studies worldwide have shown an association between night shift (15-20% of workers and an increased risk of breast cancer, this being a highly prevalent disease and the leading cause of neoplasia in women. In 2007, the IARC considered night shift as a probable carcinogen (category 2A. Night shifts produce a circadian

  1. Análise das funções cognitivas e sono na equipe de enfermagem nos turnos diurno e noturno Análisis de la función cognitiva y el sueño en el equipo de enfermería en los turnos de el día y nocturno Analysis of cognitive function and sleep of nursing staff on different shift work

    Beatriz de Oliveira

    2013-03-01

    Full Text Available Este estudo teve como objetivo analisar a memória de curto prazo, a atenção e o padrão do sono na equipe de enfermagem nos turnos diurno e noturno. Participaram 109 sujeitos de uma instituição hospitalar de Minas Gerais, distribuídos nos turnos: diurno (n= 68 e noturno (n=41. Utilizou-se, para coleta de dados: Diário de sono e Testes da Bateria WAIS III. Os resultados para a medida da qualidade do sono dos sujeitos do turno noturno apresentou diferença significativa (pEste estudio tuvo como objetivo analizar los estándares de memoria a corto plazo, la atención y su sueño personal de enfermería en los turnos. Los participantes del estudio fueron 109 pacientes de un hospital, en Minas Gerais, distribuidos en el turno de día (n = 68 y turno de noche (n = 41. La recolección de datos se realizó a través del diario del sueño y de la batería de prueba WAIS III. Los resultados muestran que existe una diferencia significativa en la calidad del sueño del trabajo en turnos de noche (p The aim of this study was to analyze short-term memory, attention and sleep patterns of the nursing staff working night and day shifts. Study participants were 109 subjects in a hospital in Minas Gerais working on the day shift (n = 68 or night shift (n = 41. Data collection was performed using the Sleep Diary and WAIS-III Test Battery. The results showed a significant difference for the quality of sleep of those on night shift work (p <0.0001; ANOVA. The subjects on the day shifts performed better on the Digit Symbol with a significant difference (p = 0.0008; Mann-Whitney test. In conclusion, the quality of sleep of the group on the night shift showed lower averages compared with those on the day shifts, although they had greater total sleep. The level of attention showed to be best for the group on the day shift work.

  2. Fadiga e capacidade para o trabalho em turnos fixos de doze horas Fatigue and workability in twelve-hour fixed shifts

    Ricardo Jorge Metzner

    2001-12-01

    Full Text Available OBJETIVO: Analisar as variáveis que interferem na percepção de fadiga e na capacidade para o trabalho em trabalhadores que executam suas atividades em turnos fixos diurnos e noturnos. MÉTODOS: Estudo transversal, com participação de 43 trabalhadores de turnos diurnos e noturnos de uma indústria têxtil, que trabalhavam em turnos fixos de 12 horas diárias e semana reduzida. Mediante vários questionários, o grupo estudado respondeu a questões sobre: fadiga, índice de capacidade para o trabalho, características individuais, estilos de vida e condições de trabalho. Foi feita análise de regressão linear univariada. RESULTADOS: Os fatores que influenciaram a percepção de fadiga associam-se a estilos de vida dos trabalhadores (a prática de exercício físico é um fator protetor e à dificuldade em manter o sono, que, se presente, aumenta a percepção de fadiga. Os fatores associados à percepção do índice de capacidade para o trabalho (ICT foram o tempo de exercício na função e o turno noturno de trabalho: quanto maior o primeiro, menor o ICT; trabalhar à noite aumenta o ICT. A duração da jornada diária de 12 horas pode provocar aumento considerável na carga de trabalho, influenciando a percepção do trabalhador sobre a capacidade para o trabalho, a fadiga e as alterações do sono. CONCLUSÕES: Os resultados indicam que nem sempre o trabalho noturno mostra-se como fator prejudicial à saúde. Entretanto, a amostra estudada é pequena, o estudo é transversal, e pode ter ocorrido um efeito de seleção. Assim, é necessária a realização de estudos longitudinais, com amostras maiores, dado que o ICT tende a diminuir à medida que aumenta o tempo na função.OBJECTIVE: To analyze the variables associated with fatigue perception and workability on workers working 12-hour fixed night and day shifts. METHODS: A cross-sectional study was carried out. Forty-three workers, working 12-hour fixednight and day shifts in a

  3. La flexibilidad de la jornada de trabajo:teorías sobre el trabajo a turnos y el mismatch de horarios

    Vázquez Méndez, María del Mar

    2009-01-01

    [SPA]En esta tesis se realiza un análisis teórico de la determinación de la jornada de trabajo y su relación con el resto de variables que caracterizan el mercado laboral. El interés se centra en el horario de trabajo y en su flexibilidad. Para ello se define la jornada a través de dos variables: el momento de inicio y la duración, y sobre esta base se construyen dos modelos. El primero es un modelo de equilibrio general con trabajo a turnos. En él se pone de manifiesto cómo...

  4. Influência do turno de rega no crescimento e produção do tomateiro no verão em Seropédica Influence of the irrigation schedule on growth and production of tomato during summer

    José A Monte

    2009-06-01

    Full Text Available Com o objetivo de analisar a influência do turno de rega na cultura do tomateiro para mesa (híbrido Débora tipo longa vida, realizou-se um experimento de campo, no delineamento em faixas, com quatro tratamentos e quatro repetições, de 21/09/05 a 31/01/06. Foram avaliados , o turno de rega diário (TR0; turno de rega alternado de um dia (TR1; turno de rega alternado de dois dias (TR2; e turno de rega alternado de três dias (TR3. Para todos os tratamentos foi reposto 100% da ETc. Durante o experimento, foram realizadas seis coletas para determinação da biomassa e da área foliar visando o estudo de análise do crescimento das plantas, sendo ajustadas equações para estimativa dos índices fisiológicos de crescimento da cultura. Foi possível constatar que o pico máximo de crescimento ocorreu entre 80 e 90 dias após o transplante, não sendo possível no entanto, diferenciar um tratamento que proporcionasse melhor crescimento. Os resultados obtidos indicaram que o turno de rega de três dias reduziu o número de frutos grandes (>60 mm e aumentou o número de frutos miúdos (40 a 50 mm. Contudo, o turno de rega de dois dias proporcionou produção de tomate igual ou superior ao de turnos mais frequentes e com maior eficiência de uso de água. Para as condições de primavera-verão de 2005-2006 em Seropédica-RJ, o turno de rega alternado de dois dias mostrou-se mais favorável para recomendação aos agricultores.The influence of the irrigation schedule was evaluated on the tomato culture, Debora hybrid for salad, in a field experiment, in a split plot design with four treatments and four replications, conducted from September, 21st, 2005 to January, 31st, 2006. We evaluated the irrigation every day (TR0; irrigation every two days (TR1; irrigation every three days (TR2; irrigation every four days (TR3. 100% of the ETc was applied in all treatments. During the essay, six samplings of plants were performed to determine the plant weight

  5. Percepção dos efeitos do trabalho em turnos sobre a saúde e a vida social em funcionários da enfermagem em um hospital universitário do Estado de São Paulo Nursing staff perceptions of the effects of shift work on health and social life at the São Paulo State University hospital

    Ester de S. Costa; Ione Morita; Miguel A. R. Martinez

    2000-01-01

    O trabalho em turnos existe desde o início da vida social dos homens, sendo utilizado em diferentes setores, como na indústria de produção de bens de consumo e de serviços. A área da saúde exige o sistema em turnos para manutenção de atividades durante 24 horas. Teve-se como objetivo identificar os sistemas de turnos em funcionários de enfermagem em um hospital universitário, avaliar a percepção sobre os prováveis efeitos do trabalho em turnos em sua saúde e vida social e o grau de participaç...

  6. Caracterization de las trypsinas y amilasas de Penaeus vannamei (crustacea decapoda) : adaptacion a la composicion deln regimen alimenticio

    Van Wormhoudt, Alain; Le Moullac, Gilles; Klein, Birgit; Sellos, Daniel

    1999-01-01

    Las tripsinas, entre las proteasas, y las amilasas, entre las carbohidrasas, son las enzimas más activas en Penaeus vannamei, un camarón de interés comercial, especialmente en Latinoamérica. Estas enzimas y sus cDNAS fueron caracterizados. En lo que respecta a las tripsinas, se reconocieron cinco isoformas y se analizaron sus cDNAs correspondientes, los cuales codifican una preproenzima de 225 aminoácidos conteniendo un supuesto precursor peptídico de 14 residuos y una secuencia señal alta...

  7. Adaptaciones morfológicas foliares en tomate cultivado en bioespacio de techo retráctil con clima cálido Morphological leaf adaptations in tomato grown in warm retractable-roof bio-space

    Jorge Berni Medina Medina

    2012-02-01

    Full Text Available Se analizaron las condiciones microclimáticas y la morfologíafoliar de tomate indeterminado de dos bioespacios: invernadero de techo retractil y casa sombra en Culiacán, Sinaloa, México; durante el periodo 2009 a 2010. Los resultados muestran que el invernadero de techo retractil, genera condiciones más favorables para la fotosíntesis, como resultado de una menor fluctuación térmica al interior de este bioespacio, en comparación con el ambiente impuesto por la casa sombra. Las temperaturas extremas (máximas y mínimas al interior del invernadero de techo retractil, se mantuvieron en un rango significativamente menor y por lo tanto, más favorable para la producción y la estabilidad reproductiva de tomate en el clima cálido de Culiacán, en comparación con casa sombra. Lo anterior fue corroborado por la magnitud de las variables morfológicas foliares analizadas y las diferencias detectadas entre foliolos desarrollados en ambos casos. Los valores de índice de área foliar, grosor de hoja, longitud del parénquima en empalizada y presencia de doble parénquima empalizada, observados en plantas desarrolladas en invernadero de techo retractil, superaron significativamente a los valores observados en casa sombra. Los resultados permiten concluir que los mayores rendimientos de tomate reportados recientemente para invernadero de techo retractil en climas cálidos, se deben en gran parte a la mayor eficiencia fotosintética, que resulta de las modificaciones y adaptaciones morfológicas foliares al microclima impuesto por el invernadero de techo retractil. Estos resultados apoyan la visión del manejo agronómico innovador, para la búsqueda por acondicionarlos espacios para la expresión de la vida. El concepto científico de bioespacio para la producción vegetal bajo sistemas de agricultura protegida, es fundamental para proponer medidas de adaptación ante el cambio climático.Microclimatic conditions and indeterminate tomato leaf

  8. A influência dos horários de trabalho (horário normal e horário por turnos) na qualidade de vida no trabalho e engagement profissional

    Costa, Tatiane Claudino da

    2013-01-01

    Este estudio tiene como objetivo principal analizar e identificar la influencia que tienen los diferentes horarios de trabajo (horario normal de trabajo y horario por turnos) en la calidad de vida en el trabajo (CVT) y en el e engagement de los trabajadores (EP). Realizamos un estudio cuantitativo, utilizando una encuesta por cuestionario com três secciones: En la primera evaluamos los datos socio demográficos; en la segunda evaluámos el Engagement profesional (Cuestionario del bienestar e...

  9. Influencia de la calidad de sueño sobre variables psicopatológicas: un análisis comparativo entre trabajadores sometidos a turnos y trabajadores con horario normal

    Juan Carlos Sierra

    2009-01-01

    Full Text Available Este estudio analiza los problemas psicológicos (calidad de sueño y rasgos psicopatológicos derivados de un sistema de trabajo por turnos con horario nocturno, y la influencia que la calidad de sueño de los trabajadores pudiera tener sobre determinadas variables psicopatológicas. Para ello se comparó una muestra de trabajadores sometidos a rotaciones en el turno de trabajo (n = 197 con otra de trabajadores con horario normal (n = 40 del mismo contexto laboral. Los participantes contestaron el Índice de Calidad de Sueño de Pittsburg y el Cuestionario de 90 Síntomas-Revisado. Los resultados ponen de manifiesto la mala calidad de sueño y los elevados niveles de psicopatología presentes en los trabajadores sometidos a turnos con respecto a los trabajadores con un horario habitual. Además, se demuestra que la calidad subjetiva del sueño, la disfunción diurna, la latencia de sueño y las perturbaciones del sueño explican el 35% de la varianza total del Índice Sintomático General. Se destaca la relevancia que tiene la mala calidad de sueño en la explicación de determinados rasgos psicopatológicos.

  10. Influencia de los turnos de trabajo y las guardias nocturnas en la aparición del Síndrome de Burnout en médicos y enfermeras Influence of shift work and night shifts in the onset of the Burnout Syndrome in doctors and nurses

    Ambar Deschamps Perdomo

    2011-09-01

    Full Text Available La sociedad actual que funciona 24 horas al día, obliga a las organizaciones y en consecuencia a sus empleados a someterse a horarios de trabajo que van en contra del ritmo natural de la vida. El horario por turno y las guardias, fuera de las horas normales del día, es un tema que cobra importancia, ya que son muchas las implicaciones que esto trae como consecuencia en la salud física y mental de quienes lo realizan. Objetivo: Analizar la evidencia científica existente la influencia de los turnos de trabajo y las guardias nocturnas en la aparición del síndrome de Burnout en médicos y enfermeras. Método: Varias bases de datos han sido analizadas (Medline, Pubmed, Lilacs, Cochrane, con descriptores específicos y según criterios de inclusión se ha obtenido la bibliografía. Resultados: Se localizaron 40 artículos. De los cuales, 16 (40% corresponden a estudios en enfermeras y 24 (60% sobre médicos, principalmente médicos en formación. Parece existir una relación de la influencia de los turnos de trabajo y las guardias nocturnas con la aparición del síndrome de Burnout, en médicos y enfermeras. Conclusión: La identificación de los factores de riesgo psicosocial a los que pueden estar expuestos los médicos permitirá adoptar medidas preventivas, que pueden ser útiles para mejorar la salud y la calidad de vida de este colectivo profesional.Society today works 24 hours a day, forcing organizations and their employees to submit work schedules that go against the natural rhythm of life. Shift work and night work, is an issue that is becoming important, as there are important consequences in physical and mental health of those who work this way. Objective: Analyze the existing scientific evidence of the influence of shift work and night shifts in the onset of burnout syndrome among physicians and nurses. Method: Several databases have been reviewed (Medline, Pubmed, Lilacs, Cochrane, with specific descriptors and bibliography has

  11. Determinantes do voto no primeiro turno das eleições presidenciais brasileiras de 2010: uma análise exploratória

    Jairo Nicolau

    2014-12-01

    Full Text Available O objetivo deste artigo é avaliar o efeito de um conjunto de variáveis no voto dos principais candidatos (Dilma Rousseff, José Serra e Marina Silva e nos votos nulos e em branco no primeiro turno das eleições presidenciais brasileiras de 2010. A pesquisa é baseada nos resultados do Estudo Eleitoral Brasileiro (Eseb-2010. Para análise dos dados foi utilizado um modelo de regressão logística multinomial, cujos resultados são também apresentados por intermédio de gráficos com as probabilidades preditas do voto segundo algumas variáveis. Entre as variáveis selecionadas, a escolaridade, a região, a religião, a preferência partidária, o autoposicionamento na escala esquerda-direita e a avaliação de governo foram as que apresentaram diferenças na votação obtida pelos candidatos. Por outro lado, o sexo, a idade e a participação no programa Bolsa Família tiverem reduzido impacto nessa votação.

  12. Trabajo por turnos y presencia de obesidad en los trabajadores: Una revisión sistemática exploratoria

    Morales Dottor, Diana Carolina

    2014-01-01

    La obesidad es un problema de salud pública de alta prevalencia a nivel global llegando a ser considerada una epidemia en varios países incluyendo latinoamericanos como México y Colombia. Existen factores individuales, pero también factores sociales y culturales que influyen negativamente sobre los hábitos alimenticios y la cada vez menor actividad física de la población mundial. Las personas pasan 8 o más horas al día en sus lugares de trabajo, por lo tanto, además de los aspectos cult...

  13. The relationship between shift work and sleep patterns in nurses Relação entre trabalho por turnos e padrões de sono em enfermeiros

    Manuel Fernando dos Santos Barbosa

    2013-03-01

    Full Text Available The scope of this study was to evaluate the sleep/wake cycle in shift work nurses, as well as their sleep quality and chronotype. The sleep/wake cycle was evaluated by keeping a sleep diary for a total of 60 nurses with a mean age of 31.76 years. The Horne & Östberg Questionnaire (1976 for the chronotype and the Pittsburgh Sleep Quality Index (PSQI for sleep quality were applied. The results revealed a predominance of indifferent chronotypes (65.0%, followed by moderately evening persons (18.3%, decidedly evening persons (8.3%, moderately morning persons (6.6% and decidedly morning persons (1.8%. The sleep quality perception was analyzed by the visual analogical scale, showing a mean score of 5.85 points for nighttime sleep and 4.70 points for daytime sleep, which represented a statistically significant difference. The sleep/wake schedule was also statistically different when considering weekdays and weekends. The PSQI showed a mean of 7.0 points, characterizing poor sleep quality. The results showed poor sleep quality in shift work nurses, possibly due to the lack of sport and shift work habits.Este estudo teve como objectivo analisar o ciclo vigília-sono em enfermeiros que trabalham por turnos, bem como a qualidade do sono e cronótipo. O ciclo vigília-sono foi avaliado através do diário de sono, num total de 60 enfermeiros, com idade média de 31.76 anos. Para o cronótipo utilizou-se o Questionário de Horne e Östberg, de 1976, e para medir a qualidade de sono calculou-se o Índice Qualidade de Sono de Pittsburg (PSQI. Os resultados do cronótipo mostraram uma predominância para tipo indiferente (65.0%, seguido do tipo Moderamente Vespertinos (18.3%, Definitivamente Vespertino (8.3%, Moderadamente Matutinos (6.6% e Definitivamente Matutinos (1.8%. A percepção da qualidade do sono autorreportada pela Escala Analógica Visual (VAS foi de 5.85 pontos, em média, para o sono nocturno e 4.70 para o sono diurno, diferen

  14. Temporada e turno de vocalização de Leptodactylus natalensis Lutz, 1930 (Amphibia, Anura na mata atlântica de Pernambuco, Brasil

    Fabiana Oliveira de Amorim

    2009-01-01

    Full Text Available A atividade de vocalização de uma população de Leptodactylus natalensis foi monitorada em uma poça temporária entre novembro/2002 e outubro/2004. A poça está situada em um fragmento de Mata Atlântica conhecido como Refúgio Ecológico Charles Darwin, município de Igarassu, Estado de Pernambuco. Os animais apresentaram-se ativos na maioria dos meses, apresentando picos na estação seca. A atividade de vocalização foi registrada durante o dia e a noite. Houve influência negativa e significativa entre a atividade vocal e a temperatura. O número de indivíduos vocalizando não foi significantemente afetado pela precipitação pluviométrica, mas o foi pelo número de fêmeas no ambiente. Verificou-se uma grande plasticidade na atividade de vocalização de L. natalensis durante a temporada e turno.Vocalizations of a population of Leptodactylus natalensis were monitored in a temporary pond from November 2002 to October 2004. This pond is located in a fragment of Atlantic rainforest belonging to the private Ecologic Refuge Charles Darwin, in the city of Igarassu, state of Pernambuco, Brazil. Individuals were active during most of the studied months, with peaks of activity during dry season. Vocal activity was recorded both in day and nighttime. There was a significant negative effect of temperature on vocal activity. The number of individuals vocalizing was not affected significantly by rainfall, but it was by the number of females on the environment. A great plasticity of vocal activities of L. natalensis was verified, both in season and turn.

  15. Análisis de los efectos de la nocturnidad laboral permanente y de la rotación de turnos en el bienestar, la satisfacción familiar y el rendimiento perceptivo-visual de los trabajadores

    Sánchez González, Juan Manuel

    2004-01-01

    En este estudio se analizan los efectos de la nocturnidad laboral permanente y de la rotación de turnos en el bienestar personal, material, laboral y sexual-afectivo, en la satisfacción familiar y en el rendimiento perceptivo-visual de los trabajadores. Se estudian las relaciones existentes entre el dominio familiar y el laboral, y también la incidencia de los problemas médicos, el salario, consumo de medicamentos, conductas de salud, tipología circadiana, duración de la jornada laboral, real...

  16. Turno de corta y posibilidad de los bosques de lenga (Nothofagus pumilio) en Tierra del Fuego (Argentina) Rotation length and sustainable use of lenga (Nothofagus pumilio) forests in Tierra del Fuego (Argentina)

    Guillermo Martinez Pastur; María Vanessa Lencinas; Ricardo Vukasovic; Pablo Peri; Boris Díaz; Juan Manuel Cellini

    2004-01-01

    La ordenación forestal regional es una herramienta indispensable para desarrollar políticas forestales que protejan los bosques naturales, en el marco del manejo sustentable y del uso múltiple. Para ello se debe contar con parámetros y modelos confiables que simulen alternativas de producción y de uso del suelo. El inventario forestal es la herramienta base, pero que sin cálculos precisos de turno forestal no puede brindar datos confiables de posibilidad. Por lo que el objetivo del presente t...

  17. Y... toca ahora el turno para la "mirada" de mujer: analisis de genero y creacion en las artes visuales contemporaneas

    Avital H. Bloch

    2003-01-01

    Full Text Available El artículo la nueva historia y el nuevo arte y en orientación de género. así como su crítica conforme se desarrolló en los Estados Unidos a lo largo de las últimas tres décadas. Analiza la manera en que las ideas del movimiento de liberación de las mujeres, a partir de los últimos años de la década de los sesenta, influyeron en artistas y en académicos del arte. El arte, la crítica y la historia del arte feministas han rechazado los paradigmas sobre los cuales se han basado los discursos y las prácticas artísticas desde varios siglos atrás. El ensayo explica que en la base del cambio esta el hecho de que la nueva visión rechazo la noción de neutralidad en el arte. Los académicos feministas así como las mujeres artistas han expuesto el complejo trasfondo de los prejuicios ideológicos antifemeniles y de género en el arte dominado por los hombres. Al centrarse en varias mujeres norteamericanas representativas de las artes visuales desde principios del siglo XX hasta el presente, se ilustra la forma en que el análisis através de la percepción de género ha revolucionado, de hecho. nuestra comprensión del arte y del mundo artístico.

  18. Protocolo de actuación preventiva para riesgo debido a alteraciones del ritmo circadiano en médicos de urgencias que trabajan en turnos de 24 horas Preventive action protocol for risk due to circadian rhythm disturbances in emergency physicians working in 24 hours shifts

    Loreto Fillat de Acosta

    2009-12-01

    Full Text Available La autora analiza la situación patológica de los médicos de urgencias con turnos de 24 horas que alteran el ritmo circadiano, el estudio describe las condiciones de trabajo que afectan el ritmo biológico sueño-vigilia y las tareas intelectuales y de habilidades mecánicas desempeñadas por este personal, los daños a prevenir (accidentes in itinere, accidentes por manipulación de material biológico, enfermedades somáticas y psíquicas y el riesgo para los pacientes. Se propone un protocolo de actuación preventiva que abarca la mayor parte del trabajo, cuándo actuar, revisión de recursos, actuaciones a realizar en una unidad de salud laboral y sistema de comunicación al resto del hospital, Servicio de Prevención de Riesgos Laborales y Sistema Nacional de Salud.The author analyzes the pathological situation concerning to emergency physicians with 24-hour shifts which disturb their circadian rhythms, the study describes the working conditions that affect the biological sleep-wake rhythm and intellectual tasks and mechanical skills performed by these staff, damage to be prevented (commuting accidents, accidents caused by handling of biological material, somatic and psychic diseases and the risk to patients. After that, it's developed a proposal of preventive action protocol covering most of the work and finally when to act, available resources and actions to be taken in an occupational health unit, in addition to the communication system to the rest of the hospital, Occupational and Hazard Preventive Service and the National Health System.

  19. El petit peix que ha evolucionat en un temps rècord pel fet de viure al desert

    Bueno i Torrens, David, 1965-

    2016-01-01

    La vall de la Mort, als EUA, és una de les zones més àrides, caloroses i inhòspites del planeta. A cavall entre els estats de Califòrnia i Nevada, el nombre de plantes i animals és significativament escàs. La majoria presenten adaptacions particulars per resistir la sequera i les altes temperatures, que s'han anat incrementant progressivament durant centenars de milers d'anys, a mesura que la zona s'anava desertitzant. Investigadors del servei de pesca i vida salvatge dels EUA i de diverses u...

  20. Percepção dos efeitos do trabalho em turnos sobre a saúde e a vida social em funcionários da enfermagem em um hospital universitário do Estado de São Paulo

    Ester de S. Costa

    2000-06-01

    Full Text Available O trabalho em turnos existe desde o início da vida social dos homens, sendo utilizado em diferentes setores, como na indústria de produção de bens de consumo e de serviços. A área da saúde exige o sistema em turnos para manutenção de atividades durante 24 horas. Teve-se como objetivo identificar os sistemas de turnos em funcionários de enfermagem em um hospital universitário, avaliar a percepção sobre os prováveis efeitos do trabalho em turnos em sua saúde e vida social e o grau de participação desses funcionários na forma de organização de sua jornada. Trata-se de uma pesquisa descritiva e exploratória, cujos resultados foram obtidos mediante questionário aplicado a 348 funcionários da enfermagem do Hospital de Clínicas da Faculdade de Medicina de Botucatu, São Paulo. Dentre os resultados, observou-se que, em sua maioria, eles tinham menos de 40 anos, eram casados, do sexo feminino, com um filho pelo menos, cumprindo uma escala de turnos alternados, com freqüência de revezamento superior a quinze dias e referindo queixas de caráter neuro-psíquico, gastrintestinal e cardiovascular. Houve ainda queixas sobre relacionamento e tempo de convivência. Na maioria das vezes, era pouca a participação do funcionário na forma de organização de sua escala de trabalho.

  1. Revisionismo teórico sobre el fenómeno de las adaptaciones acuáticas durante el paleolítico y su relación con el desafío de la navegación de cabotaje y gran cabotaje en los tiempos pleistocénicos : cuenca occidental mediterránea y zona insular del sudeste asiático

    Cuadrado Martín, Luis Blas

    2015-01-01

    El presente trabajo de investigación trata dos cuestiones que considero íntimamente relacionadas: las adaptaciones acuáticas durante el Paleolítico y el desafío de la navegación pleistocènica. El fundamento de la citada correlación lo baso en la siguiente premisa: comer antes que viajar. Debido a este planteamiento he considerado necesario llevar a cabo un proceso revisionista sobre las citadas adaptaciones acuáticas, debido a que !a comunidad científica aún no acepta, de forma generalizada, ...

  2. Passagem de plantão: falando de paradigmas e estratégias Pasaje del turno: hablando de los paradigmas y las estratégias Shift report: talking about paradigms and strategies

    Ivana Lucia Correa Pimentel de Siqueira

    2005-12-01

    Full Text Available O objetivo deste artigo é apresentar quatro modalidades de passagens de plantão, implementadas em unidades de internação de um hospital privado de São Paulo, destacando os pontos negativos e positivos. A discussão destes pontos baseou-se no resgate de informações da literatura pertinente na experiência vivencial das autoras. Os diferentes tipos de passagem de plantão foram implantadoas conforme a estratégia adotada, sequencialmente, visando minimizar problemas de horas extras, devido à duração da passagem de plantão e às diferenças na compreensão das informações. As duas últimas estratégias pertencem a um conjunto de ações propostas em um modelo de gestão implantado no referido campo. Destaca a necessidade de integração entre a estratégia utilizada na passagem de plantão e o modelo assistencial vigente, o tipo de escala de divisão de serviços e a qualidade das anotações do prontuário. Ressalta que o compromisso e a capacitação dos profissionais são fundamentais na obtenção de resultados.El objetivo de este artículo es presentar cuatro modalidades de entrega de turno, implementadas en unidades de internamiento de un hospital privado de São Paulo, destacando los puntos negativos y positivos. La discusión de estos puntos se basó en el rescate de informaciones de la literatura pertinente y en la experiencia vivida por las autoras. Los diferentes tipos de entrega de turno fueron implantados de acuerdo a la estrategia adoptada, secuencialmente, con vistas a minimizar problemas de horas extras, debido a la duración de la entrega de turno y a las diferencias en la comprensión de las informaciones. Las dos últimas estrategias pertenecen a un conjunto de acciones propuestas en un modelo de gestión implantado en el referido campo. Se destaca la necesidad de integración entre la estrategia utilizada en la entrega de turno y el modelo asistencial vigente, el tipo de escala de división de servicios y la calidad

  3. Atención a la diversidad en el aula de EF, propuesta de intervención basada en adaptaciones en juegos para discapacitados visuales

    Bartolomé Hernández, Sandra

    2015-01-01

    Hoy en día conviven dentro del aula niños y niñas con diferentes capacidades físicas y habilidades motoras. Partiendo de este punto, nos encontramos ante una sociedad que busca la integración y la atención a la diversidad, de forma que todos tengan las mismas oportunidades de participar y desarrollar sus potencialidades como seres humanos de cara al futuro diario, sin ningún tipo de marginación o exclusión. A través del área de Educación Física, el presente trabajo, busca por un lado, satisfa...

  4. Percepção dos efeitos do trabalho em turnos sobre a saúde e a vida social em funcionários da enfermagem em um hospital universitário do Estado de São Paulo Nursing staff perceptions of the effects of shift work on health and social life at the São Paulo State University hospital

    Ester de S. Costa

    2000-06-01

    Full Text Available O trabalho em turnos existe desde o início da vida social dos homens, sendo utilizado em diferentes setores, como na indústria de produção de bens de consumo e de serviços. A área da saúde exige o sistema em turnos para manutenção de atividades durante 24 horas. Teve-se como objetivo identificar os sistemas de turnos em funcionários de enfermagem em um hospital universitário, avaliar a percepção sobre os prováveis efeitos do trabalho em turnos em sua saúde e vida social e o grau de participação desses funcionários na forma de organização de sua jornada. Trata-se de uma pesquisa descritiva e exploratória, cujos resultados foram obtidos mediante questionário aplicado a 348 funcionários da enfermagem do Hospital de Clínicas da Faculdade de Medicina de Botucatu, São Paulo. Dentre os resultados, observou-se que, em sua maioria, eles tinham menos de 40 anos, eram casados, do sexo feminino, com um filho pelo menos, cumprindo uma escala de turnos alternados, com freqüência de revezamento superior a quinze dias e referindo queixas de caráter neuro-psíquico, gastrintestinal e cardiovascular. Houve ainda queixas sobre relacionamento e tempo de convivência. Na maioria das vezes, era pouca a participação do funcionário na forma de organização de sua escala de trabalho.There is a relationship between shift work and the beginning of organized life. Health services require shift work to keep activities running twenty-four hours a day. This study thus aimed to identify nursing staff shift work systems in a university hospital, evaluate health workers' perceptions of the possible effects of shift work on their health and social life, and assess workers' participation in preparing nursing schedules. In terms of materials and methods, this was an exploratory and descriptive study with a sample of 348 nursing staff members, using an appropriate questionnaire. Most were married women under 40 with at least one child, working on

  5. Organización de turnos para la optimación energética de redes colectivas de riego a presión

    Sánchez Calvo, Raúl; Laguna Peñuelas, Francisco; Juana Sirgado, Luis; Losada Villasante, Alberto; Castañon Lion, Guillermo; Rodríguez Sinobas, Leonor; Gil Rodríguez, María

    2009-01-01

    Una parte considerable de los costes de explotación en riegos a presión corresponde al consumo de energía en sus sistemas de elevación. Dichos costes se han visto incrementados sustancialmente desde la aplicación efectiva de los contenidos del RD 871/2007 por el que se ajustan las tarifas eléctricas. FENACORE (2009a) manifiesta la preocupación de que el regadío podría llegar a ser insostenible con las tarifas actuales. De hecho, la modificación 2 de las tarifas ha supuesto un coste al sec...

  6. PSPVDC: Una Propuesta que Incorpora el Diseño por Contrato Verificado al Personal Software Process

    Silvana Moreno

    2013-10-01

    Full Text Available El desarrollo de software se ha vuelto una actividad muy importante en el mundo actual. Existen números procesos de desarrollo de software que buscan aumentar la calidad de los productos y disminuir los tiempos de salida al mercado. Sin embargo, el software contiene defectos y éstos causan fallas potencialmente graves durante su ejecución. Este trabajo propone un nuevo proceso de desarrollo de software denominado PSPVDC que combina el enfoque del Personal Software Process (PSP y del Diseño por Contrato Verificado (VDbC con el objetivo de mejorar la calidad de los productos con respecto al PSP. Además se presenta una revisión sistemática de la literatura que busca conocer las adaptaciones al PSP que hayan sido documentadas, en particular aquellas que incorporan métodos formales.

  7. Adaptaciones de la fiscalidad a la economía rural en los inicios del período independiente. Estacionalidad productiva e impuestos al comercio en la campaña de Buenos Aires (1810-1840

    Antonio Galarza

    2015-05-01

    Full Text Available El artículo versa acerca de las reformas fiscales de 1822 en la provincia de Buenos Aires, las cuales establecieron un calendario de pagos para los comercios rurales. A partir de la hipótesis de que la fecha estipulada en dicho calendario se correspondía con los momentos más álgidos de la práctica comercial en la campaña porteña, se indaga en la estacionalidad de las actividades productivas y comerciales en la campaña sur. Sobre la base del estudio de caso del partido de Chascomús, se analizan además las características de la recaudación de estos impuestos en las décadas de 1810, 1820 y 1830, a fin de identificar su posible vinculación con la estacionalidad del comercio.   The article concerns the tax reforms of 1822 in the province of Buenos Aires, which established a payments calendar for rural trade. From the hypothesis that the date specified in the calendar corresponds with the most critical moments of commercial practice in Buenos Aires’s countryside, I examine the seasonality of production and commercial activities in the southern hinterland. Based on the case study of Chascomús, this article also examines the characteristics of this collection of taxes in the 1810s, 1820s and 1830s to identify their possible relationship with the seasonality of trade.

  8. Planejamento de turnos de trabalho: uma abordagem no setor sucroalcooleiro com uso de simulação discreta Work shift planning: an approach to the sugarcane sector using discrete simulation

    João Eduardo Azevedo Ramos da Silva

    2011-01-01

    Full Text Available O Brasil é o maior produtor de cana-de-açúcar do mundo, sendo responsável pela geração de 3 milhões de empregos em toda a sua cadeia de suprimentos. A alimentação constante das moendas durante o período de safra depende do bom gerenciamento das operações de corte, carregamento e transporte de cana-de-açúcar das fazendas para as usinas. A entrega de cana-de-açúcar deve ser garantida para que o risco de parada da produção industrial de açúcar e álcool seja evitado. Este trabalho foca o desenvolvimento e a utilização de um modelo de simulação discreta para a determinhação do sistema de turnos de trabalho dos operadores de equipamentos agrícolas de uma usina no Estado de São Paulo, considerando os requisitos de moagem, o risco da falta de matéria-prima e o limite permitido das jornadas de trabalho. Quatro cenários foram propostos para avaliação, sendo o primeiro com a troca de turnos unificada às 7 e às 19 horas; e os demais com a entrada em operação de uma das frentes de corte e carregamento com 2, 4 e 6 horas de defasagem em relação às demais frentes (escalonamento. O cenário com escalonamento de quatro horas de defasagem apresentou o melhor desempenho ao conciliar a entrega de cana, as jornadas de trabalho e o risco de desabastecimento. A discussão é focada no caso selecionado, mas estudos similares podem ser aplicados a outras usinas de açúcar e álcool ou a outros processos do setor sucroalcooleiro.Brazil is the world´s greatest producer of sugarcane generating 3 million jobs within its supply chain. The continuous feeding of sugarcane mills during the harvest season strongly depends on the good management of harvest and operations of loading and transporting the sugarcane from farms to mills. A guaranteed delivery of sugarcane must be developed to avoid the risk of stopping the production of sugar and alcohol. This study focuses on the development and use of a computer simulation model to evaluate

  9. Influência do turno laboral na formação de edema dos membros inferiores em indivíduos normais Influence of working shift on the formation of lower limb edema in normal individuals

    Cleusa Ema Quilici Belczak

    2008-09-01

    Full Text Available CONTEXTO: A presença de edema vespertino nos membros inferiores de indivíduos normais, após jornada habitual de trabalho, foi demonstrada na literatura nacional e internacional. O ritmo de formação e o acúmulo desse edema variam de acordo com os distintos turnos laborais. OBJETIVO: O edema de membros inferiores tem sido descrito após jornadas habituais de trabalho e representa uma queixa freqüente na prática vascular. O objetivo deste estudo foi avaliar a evolução do edema em indivíduos normais durante os distintos turnos laborais. MÉTODO: Foram feitas avaliações volumétricas de ambos os membros inferiores em 20 profissionais da área da saúde do Hospital e Maternidade São Marcos de Maringá, no Paraná. A escolha dos participantes foi por ordem de chegada, e as volumetrias foram feitas por técnica de deslocamento de água às 7, 13 e 19 h. Para análise estatística foi utilizado o teste t de Student, considerando erro alfa de 5%. RESULTADO: Dos 20 participantes, 19 eram do sexo feminino e 1 do masculino, sem evidência de doença venosa nos membros inferiores e pertencentes a C0 e C1 da classificação CEAP (C = clínica, E = etiologia, A = segmento anatômico, P = fisiopatologia. As idades dos participantes variaram entre 20 e 53 anos. Detectou-se aumento significativo de volume nos membros inferiores entre os distintos períodos avaliados, com p = 0,0001 e 0,0001, respectivamente. A maior variação ocorreu no período da manhã, com média ± desvio padrão de 107,2±63,5 mL, enquanto que à tarde, a variação foi de 44,5±35,4 mL. CONCLUSÃO: O edema é uma constante durante atividades laborais, mesmo em pessoas sem doença venosa manifesta e sofre influência do turno laboral ao qual o trabalhador se encontra exposto.BACKGROUND: Presence of evening edema of lower limbs in normal individuals after a regular working shift has been shown in the national and international literature. Formation rhythm and accumulation of

  10. Leyendas Puertorriquenas, Adaptaciones (Puerto Rican Legends, Adaptations).

    Rodriguez, Aurea; Puigdollers, Carmen

    The Puerto Rican legends presented here have been adapted for use in a bilingual education setting. They are presented in the framework of a Puerto Rican child's first visit to the island with his family. The four legends are: (1) "Carabali"; (2) "Guanina"; (3) "El Penon de las Palomas"; and (4) "La Garita del Diablo." The book is illistrated with…

  11. Del sometimiento al abandono: la exclusión encubierta en los espacios escolares

    Cristina NOSEI

    2011-01-01

    El retorno de la democracia en Argentina, reinstalo como tema central la educación de los jóvenes en vista a la formación de sujetos críticos y autónomos capaces de sustentar esa forma de vida. La crítica al aprendizaje memorístico se consumó en la mayoría de los casos en la denostación de la memoria, no solo por alentar la irreflexión sino por ser vehículo de la manipulación de la hegemonía de turno. La ilusión le gano la batalla a la investigación: la ilusión del aprender a pensar como si e...

  12. Support program to the development of the leadership for senior chiefs of shift in CNAT; Programa de apoyo al desarrollo del liderazgo para jefes de turno senior en CNAT

    Alava Reyes, M. J.; Melo Aguilera, A.

    2012-07-01

    Action program aimed at strengthening significant aspects associated with the shift supervisor in the control room. By the difficulty of joint actions of the collective, was used a methodology of personal coaching staff. The combined program of observations and Cabinet sessions lasted for six months.

  13. Tratamento de um problema de escalonamento considerando datas de entrega, turnos de produção e trocas de ferramentas via Busca Tabu Scheduling problem treatment considering due dates, production turns and toll switching constraints using Tabu Search

    Antonio Gabriel Rodrigues

    2008-01-01

    Full Text Available Neste trabalho é abordado o Problema de Escalonamento em um Job Shop aplicado a um Sistema de Manufatura Flexível (SMF, sendo consideradas restrições de datas de entrega, turnos de produção e trocas de ferramentas. O SMF considerado é composto de uma máquina versátil, um sistema de transporte e manuseio de materiais e um sistema computacional. O problema é representado por uma função objetivo f, na qual é possível definir três políticas de minimização: (i tempo de atraso, (ii tempo de parada para a troca de ferramentas e (iii tempo de trocas de ferramentas. A aplicação das políticas é feita pela definição de pesos às variáveis de decisão de f. A busca pelo escalonamento que minimiza f é feita utilizando a técnica de Busca Tabu (BT. Foram realizados experimentos onde é observado o impacto de cinco regras de geração de soluções iniciais no desempenho da Busca Tabu. Também foram realizados experimentos nos quais se verifica o comportamento da busca frente à escolha das políticas de minimização. Nestes experimentos notou-se o conflito entre a política de minimização de atraso e as de minimização de trocas de ferramentas e de paradas para trocas de ferramentas. O aumento dos parâmetros da BT, nbmax (número máximo de iterações sem encontrar melhora no resultado global da busca e tamanho da Lista Tabu, melhora o desempenho da busca para encontrar melhores resultados na minimização do atraso.In this paper is studied the Job Shop Scheduling Problem applied to a Flexible Manufacturing System (FMS environment, considering due dates, production turns and tool switching constraints. The FMS is composed by a versatile machine, a system for transport, handling and storage of materials and a computational system. This problem is represented through an objective function f, in which is possible to define three minimization policies: (i tardiness time, (ii stop time and (iii switching tools time. The

  14. ALS Association

    ... toward a world without ALS! Walk to Defeat ALS® Walk to Defeat ALS® draws people of all ... We need your help. I Will Advocate National ALS Registry The National ALS Registry is a congressionally ...

  15. Géneros textuales en el lenguaje parlamentario español: la pregunta oral en la sesión de control al gobierno

    Luis Javier Santos López

    2010-10-01

    Full Text Available Este estudio se propone demostrar que la “pregunta oral en la sesión de control al gobierno” constituye un género del lenguaje político, encuadrado en el supragénero “sesión del pleno” que, a su vez, pertenece a la familia de géneros “lenguaje parlamentario”. Para ello se realiza el análisis de un corpus del lenguaje parlamentario constituido por las transcripciones de las sesiones del pleno del Congreso de los Diputados. Se observa que este tipo de pregunta no es una interacción conversacional normal, debido a la violación de las máximas de intercambio cooperativo de Grice (1975 y 1978. Sin embargo, los turnos de preguntas y respuestas obedecen al principio de cooperación porque responden a las exigencias dialógicas del momento, el lugar, la finalidad y la norma convencional de referencia, de forma que dichos turnos conforman un género discursivo con una estructuración convencional, para el cual la violación de las máximas es funcional. Posteriormente se realiza un análisis de diferentes funciones comunicativas de la pregunta que lleva a una propuesta de clasificación dentro del lenguaje parlamentario. Se llega a la conclusión de que se puede establecer una categorización de la pregunta, basándose en las condiciones de textualidad de la estructura informativa del texto.

  16. Programas de Contra Turno Social para crianças e adolescentes na cidade de Maringá/PR: características e funções (Supplementary Activities Outside class time for children and adolescents in Maringá city - Paraná state: features and functions

    Paula Marçal Natali

    2008-01-01

    Full Text Available Resumo: Este artigo tem o objetivo de apresentar as características e funções dos programas de contra turno social os quais atendem crianças e adolescentes em situação de risco, na cidade de Maringá-PR, que foram implantados no início dos anos 90. Este estudo faz parte de uma pesquisa de mestrado que analisa os Programas de Contra Turno Social na cidade de Maringá-PR, mais especificamente no que se refere à questão do papel do lúdico inserido no currículo destes programas de contra turno social. Esta forma de atendimento foi legitimada pelo Estatuto da Criança e do Adolescente no que diz respeito às políticas de atendimento em regime de apoio sócio-educativo em meio aberto. Nesta pesquisa qualitativa, no primeiro momento apresentaremos um breve panorama das políticas de atendimento à criança e ao adolescente no Brasil, partindo da promulgação do Código de Menores de 1927 e chegando ao Estatuto da Criança e do Adolescente de 1990. Em um segundo momento, relataremos as representações dos órgãos governamentais e da sociedade civil sobre como os programas sociais de contra turno vem sendo realizados na cidade de Maringá através de entrevistas com funcionárias da Secretaria de Assistência Social e Cidadania do município e membros do Conselho Municipal da Criança e do Adolescente. Entendemos que as representações sobre o contra turno social na cidade de Maringá são carregadas de elementos técnicos e burocráticos e muito incipientes em relação aos fundamentos pedagógicos e filosóficos deste atendimento que são elementos primordiais para a efetivação dos direitos à criança e ao adolescente em situação de risco fundamentada na concepção do Estatuto da Criança e do Adolescente de sujeito de direito que busque a participação popular e que tenha um projeto emancipatório.Abstract: This paper aims to present the features and functions of the programmes of supplementary activities offered outside of

  17. Microscale adaptation of the potentiometric method with ion-selective electrode for the quantification of fluoride; Adaptacion a microescala del metodo potenciometrico con electrodo ion selectivo para la cuantificacion de fluoruro

    Guevara Ruiz, Paulina; Ortiz Perez, Maria Deogracias [Laboratorio de Bioquimica, Facultad de de Medicina, Universidad Autonoma de San Luis Potosi, San Luis Potosi, San Luis Potosi, (Mexico)]. E-mail: mdortiz@uaslp.mx

    2009-05-15

    Similarly to other countries, ground water from Mexico is naturally polluted by fluoride. The main effects of fluoride at typical ground water concentrations are dental fluorosis, neurological deficits and reproductive disorders. In order to verify that the fluoride concentration is within the allowed guideline in Mexico (NOM 127 and 201), it is important to monitor fluoride levels in water and commercial beverages. The aim of this work is to develop a modification of the standard potentiometric method for fluoride determination in water, in order to reduce costs and amount of potentially toxic waste substances. Both methods were validated, the standard potentiometric method with the ion selective electrode and the microscale modification proposed in this paper. The methods were compared using statistic tests and graphics, followed by the comparison of 125 samples of commercial bottled water sold in the city of San Luis Potosi. Optimal results were obtained for the validation of both methods, and the microscale modification showed statistically identical results to those obtained with the standard method in all samples of bottled water. The microscale modification is a good alternative for fluoride assessment in water and beverages, and it represents a 95 % reduction of costs and chemical waste. [Spanish] En varios paises, incluido Mexico se presenta una contaminacion natural con fluoruro en agua subterranea; los principales efectos en la salud observados en poblacion expuesta a concentraciones mayores al valor permisible (que en Mexico es de 1.5 mg/L) son la fluorosis dental y esqueletica, asi como dano reproductivo y neurologico. En varios estados de la republica Mexicana, este problema es aun desconocido, de ahi la necesidad de evaluar las concentraciones de fluoruro en agua de consumo en varias comunidades. Asi, el objetivo de este trabajo es desarrollar un metodo a microescala para la determinacion de fluoruro en agua, que al reducir la cantidad de reactivo y

  18. Efeito da inversão dos turnos de trabalho sobre capacidade aeróbia e respostas cardiovasculares ao esforço máximo Effect of the work shift reversal on the aerobic capacity and cardiovascular responses to maximal exercise

    Anna Myrna Jaguaribe de Lima

    2008-06-01

    Full Text Available Os distúrbios do sono e alterações associadas atingem grande parte da população que trabalha no turno noturno, afetando a sua qualidade de vida. O objetivo do presente trabalho foi comparar a capacidade aeróbia e as respostas cardiovasculares ao exercício máximo em indivíduos com ciclo sono vigília fisiológico e com inversão dos turnos de trabalho. Foram analisados 18 indivíduos do sexo masculino, sedentários, com idade entre 23-35 anos, divididos em 2 grupos: a grupo controle, formado por estudantes (n=9 e b grupo experimental, composto por controladores de tráfego aéreo que trabalhavam com inversão dos turnos de trabalho (n=9. Para a medida da capacidade aeróbia, foi determinado o VO2máx. por meio do analisador de gases metabólicos (VO-2000, Aerosport, Medgraphics. Para o teste de esforço máximo foi realizado o protocolo de rampa em esteira (Millenniun ATL Inbramed e as respostas cardiovasculares (FC, PAS e PAD foram verificadas antes e após a realização do exercício. De acordo com os resultados, o grupo experimental apresentou valores inferiores de FC no repouso (79,8 ± 11,5 bpm vs. 70,3 ± 3,8 bpm, no 5º (112,7± 15,1 bpm vs. 98,7 ± 6,3 bpm e no 7º minuto (108,7 ± 16,6 bpm vs. 93,9 ± 6,8 bpm de recuperação. Quanto à PAS, foram observados valores superiores durante o repouso (110,0 ± 11,2 mmHg vs. 104,0 ± 5,7 mmHg, nos indivíduos do grupo controle. Já a PAD, mostrou níveis superiores no 5º minuto da recuperação no grupo experimental (67,0 ± 4,4 mmHg vs. 58,9 ± 6,0 mmHg. Por fim, foram verificados valores superiores de VO2máx. para os indivíduos do grupo controle (58,9 ± 6,1 ml/kg/min em relação ao experimental (53,7 ± 2,5 ml/kg/min. Desta forma, podemos concluir que a inversão nos turnos de trabalho, afetando o ciclo sono-vigília, altera não apenas o ciclo circadiano das variáveis cardiovasculares no repouso e na recuperação do esforço, como também traz prejuízos à capacidade

  19. Implantação de sistema informatizado para planejamento, gerenciamento e otimização das escalas de enfermagem Implantación de un sistema informatizado para la planificación, administración y optimización en la elaboración de los turnos de enfermería Implementation of a computerized system to plan, manage, and optimize nursing staff schedule

    Ana Cristina Rossetti

    2009-02-01

    Full Text Available OBJETIVO: Relatar o desenvolvimento e implantação de um sistema informatizado para auxiliar no planejamento, gerenciamento e otimização das escalas de enfermagem nas unidades de internação do Hospital Israelita Albert Einstein. MÉTODOS: Foi desenvolvido o Sistema de Gerenciamento e Otimização de Recursos na plataforma tecnológica dot.Net da Microsoft®. RESULTADOS: Implantado inicialmente na área de enfermagem com visualização on-line das escalas das unidades e respectivas demandas de pacientes. Facilita e permite a elaboração e o gerenciamento das escalas mensais de trabalho, reduzindo o tempo utilizado na confecção e garantindo segurança na informação e agilidade na obtenção de dados. CONCLUSÃO:Após a implantação é possível observar ganhos e oportunidades de melhoria tanto no sistema como no processo de planejamento e gerenciamento das escalas de enfermagem.OBJETIVO: Relatar el desarrollo e implantación de un sistema informatizado para auxiliar en la planificación, administración y optimización en la elaboración de los turnos de enfermería en las unidades de internamiento del Hospital Israelita Albert Einstein. MÉTODOS: Fue desarrollado el Sistema de administración y Optimización de Recursos en la plataforma tecnológica dot.Net de Microsoft®. RESULTADOS: Fue implantado inicialmente en el área de enfermería con visualización on-line de los turnos de las unidades y respectivas demandas de pacientes. Facilita y permite la elaboración y administración de los turnos mensuales de trabajo, reduciendo el tiempo utilizado en la confección, garantizando de este modo seguridad en la información y agilidad en la obtención de datos. CONCLUSIÓN: Después de la implantación es posible observar ganancias y oportunidades de mejoría tanto en el sistema como en el proceso de planificación y administración de los turnos de enfermería.OBJECTIVE: To report the development and implementation of a computerized

  20. Adaptaciones fisiológicas en algunas especies de mangles Adaptaciones fisiológicas en algunas especies de mangles

    Polanía Jaime

    1990-06-01

    Full Text Available

    The role of manitol and proline on the osmotic balance of Aegiceras corniculatum, Aegialitis annul ata and Laguncularia racemosa were studied. Mangrove plants were grown in hydroponic cultures for several years before using them for the experiments described here. The plants grown in different salt concentrations and "shock" treatments were divided in their parts and the ion concentrations of the low molecular weight compounds of each part were analysed. High concentrations of osmotic compounds were found in all plant parts. The role of mannitol, as an overall osmotic compound, is discussed.

    Se estudia el papel del manitol, as! como de la prolina en el equilibria osmótico de Aegiceras corniculatum, Aegialitis annulata y Laguncularia racemosa , tres especies de mangles. Las plantas crecieron en cultivo hidropónico por varios años, antes de ser sometidas a los experimentos aquí reseñados. Plantas sometidas a tratamientos de diferentes salinidades, así como de "choque", fueron divididas en sus partes y en ellas se analizaron las concentraciones de los principales iones y de los compuestos de bajo peso molecular. Concentraciones altas de metabolitos fueron detectadas en todas las partes de las plantas bajo estudio. Se discute el papel del manitol como compuesto osmótico global.

  1. Normativización del Inventario del Desarrollo Comunicativo MacArthur-Bates al español, Colombia

    María Fernanda Lara Díaz

    2011-01-01

    Full Text Available El Inventario del Desarrollo Comunicativo MacArthur- Bates (CDI Fenson, Marchman, Thal, Dale & Reznick, 2007 es un instrumento que permite evaluar de forma válida y confiable el desarrollo comunicativo y lingüístico de niños pequeños. Este estudio da cuenta del proceso de adaptación del CDI a los usos lingüísticos y al contexto cultural colombiano, así como su primera fase de baremación en la ciudad de Bogotá y sus alrededores. Los padres de 825 niños y niñas entre 8 y 30 meses de edad de diferentes estratos socioeconómicos, residentes en la ciudad de Bogotá y poblaciones aledañas, diligenciaron los inventarios adaptados para la población. El análisis estadístico incluyó medidas de confiabilidad y validez, las cuales avalan la consistencia interna y el valor predictivo de las escalas. Los resultados del presente estudio permiten identificar el ritmo evolutivo del proceso de adquisición del lenguaje en los niños colombianos, observando reorganizaciones y discontinuidades tal y como se reporta en otras adaptaciones del CDI.

  2. AL Amyloidosis

    Desport Estelle

    2012-08-01

    Full Text Available Abstract Definition of the disease AL amyloidosis results from extra-cellular deposition of fibril-forming monoclonal immunoglobulin (Ig light chains (LC (most commonly of lambda isotype usually secreted by a small plasma cell clone. Most patients have evidence of isolated monoclonal gammopathy or smoldering myeloma, and the occurrence of AL amyloidosis in patients with symptomatic multiple myeloma or other B-cell lymphoproliferative disorders is unusual. The key event in the development of AL amyloidosis is the change in the secondary or tertiary structure of an abnormal monoclonal LC, which results in instable conformation. This conformational change is responsible for abnormal folding of the LC, rich in β leaves, which assemble into monomers that stack together to form amyloid fibrils. Epidemiology AL amyloidosis is the most common type of systemic amyloidois in developed countries with an estimated incidence of 9 cases/million inhabitant/year. The average age of diagnosed patients is 65 years and less than 10% of patients are under 50. Clinical description The clinical presentation is protean, because of the wide number of tissues or organs that may be affected. The most common presenting symptoms are asthenia and dyspnoea, which are poorly specific and may account for delayed diagnosis. Renal manifestations are the most frequent, affecting two thirds of patients at presentation. They are characterized by heavy proteinuria, with nephrotic syndrome and impaired renal function in half of the patients. Heart involvement, which is present at diagnosis in more than 50% of patients, leading to restrictive cardiopathy, is the most serious complication and engages prognosis. Diagnostic methods The diagnosis relies on pathological examination of an involved site showing Congo red-positive amyloid deposits, with typical apple-green birefringence under polarized light, that stain positive with an anti-LC antibody by immunohistochemistry and

  3. Modelo Innovador: “Cuidado a las Enfermeras en el Afrontamiento al Estrés en una Unidad de Cuidados Intensivos”.

    Angélica Mª Armendáriz Ortega

    2012-12-01

    Full Text Available Objetivo principal: Fomentar el cuidado en el afrontamiento al estrés a través de la Educación Para la Salud (EPS en el personal de enfermería que labora en una Unidad de Cuidados Intensivos (UCI.Metodología: Técnicas cuanti-cualitativas, orientación fenomenológica. Los participantes fueron diez enfermeras (os de UCI, diferentes turnos, horarios indistintos.Resultados principales: Los estresores laborales que mostraron promedios más altos fueron: falta de personal, falta de equipo y material, sobrecarga de trabajo, falta de medicamentos, inseguridad social; y el más bajo a relaciones interpersonales con compañeros. Así como ausencia de afrontamiento al estrés.Conclusión principal: La aplicación de éste modelo implica un proceso de cambio dirigido a desarrollar una forma de trabajo, cuidar al personal de enfermería. Poseer una nueva perspectiva de cuidado, centrado en las necesidades de la enfermera de UCI, que fomente el afrontamiento al estrés para su cuidado. AbstractInnovative model: "Nurses Care Coping Strategies in an Intensive Care Unit."Objective: Foster care in coping with stress through the Health Education in nurses working in Intensive Care Unit (ICU.Methods: quantitative techniques qualitative phenomenological orientation. Participants were ten nurses of ICU, different shifts, times indistinct.Results: The job stressors which showed higher averages were: staff shortages, lack of equipment and material, work overload, lack of medicine, social insecurity, and the lowest in interpersonal relationships with peers. And lack of coping with stress.Conclusions: The application of this model involves a process of change aimed at developing a way of working, caring nursing staff. Having a new perspective of care, focusing on the needs of the ICU nurse, which promotes coping with stress for care.

  4. All About ALS

    ... please review our exit disclaimer . Subscribe All About ALS Understanding a Devastating Disorder In the summer of ... of research dollars—for a fatal disease called ALS. ALS stands for amyotrophic lateral sclerosis. It’s also ...

  5. Aussprache als motorische Fertigkeit

    Bonner, Maria

    2013-01-01

    Authentische Aussprache gilt im Fremdsprachenunterricht als schwer erreichbares Ziel, fremdsprachlicher Akzent wird als nahezu unvermeidbar gesehen. Weder die Hypothese einer kritischen Periode für den Erwerb einer authentischen Aussprache noch das Konzept der Fossilierung im Sprachlernprozess...

  6. Amyotrophic Lateral Sclerosis (ALS)

    ... benefit of 16 months before onset of severe respiratory failure. Other treatments are designed to relieve symptoms and ... of ALS. Most people with ALS die from respiratory failure, usually within 3 to 5 years from the ...

  7. Initial Symptoms of ALS

    ... Chapters Certified Centers and Clinics Support Groups About ALS About Us Our Research In Your Community Advocate ... Diagnosis En español Symptoms The initial symptoms of ALS can be quite varied in different people. One ...

  8. Volver al desarrollo

    Jaime Ornelas Delgado

    2012-01-01

    Full Text Available El desarrollo, categoría empleada para expresar el crecimiento económico, surge durante la "guerra fría" y si bien fue propuesta por teóricos metropolitanos, se asumió en Latinoamérica como parte de los instrumentos disponibles para lograr el crecimiento y alternativa al socialismo. El desarrollo mantuvo su vigencia entre 1945 y 1975, cuando al advenimiento del neoliberalismo fue paulatinamente retirado de la agenda de las preocupaciones nacionales e internacionales. Al iniciarse el siglo xxi, el fracaso del mercado autorregulado trajo de nueva cuenta al debate los problemas del desarrollo, lo que obliga a revisarlo críticamente, tanto como al concepto mismo para mostrar su carácter colonial, si se quiere construir caminos ajenos al neoliberal y superar los problemas que han hecho de Latinoamérica una de las regiones más desiguales del mundo.

  9. Jalta als Heterotopie

    Schmid, Ulrich

    2013-01-01

    Jalta ist ein Ort, der sich im europäischen Kulturgedächtnis sowohl historisch als auch literarisch als "radikal anderer Ort" - als " Heterotopie" - festgesetzt hat. An der Konferenz von Jalta wurde 1945 eine neue Weltordnung geschaffen in der Hoffnung auf eine bessere Welt. Auch in den Werken von Anton ?echov, vor allem in denjenigen, die in Jalta entstanden sind, wird von einer anderen und besseren Welt geträumt.

  10. Pornographie als Metapher

    Caroline Schubarth

    2010-02-01

    Full Text Available In diesem Artikel werden unterschiedliche metaphorische Verwendungen des Pornografiebegriffs und deren Implikationen untersucht. Während die Existenz von Pornografie der feministischen Anti-Porno-Bewegung als Erklärung für die anhaltende Diskriminierung von Frauen in westlichen Gesellschaften dient, nutzen rechtskonservative Kräfte den Pornografievorwurf als Rechtfertigung für die Zensur von als deviant empfundenen Identitäten und sexuellen Praktiken.

  11. Pornographie als Metapher

    Caroline Schubarth

    2010-01-01

    In diesem Artikel werden unterschiedliche metaphorische Verwendungen des Pornografiebegriffs und deren Implikationen untersucht. Während die Existenz von Pornografie der feministischen Anti-Porno-Bewegung als Erklärung für die anhaltende Diskriminierung von Frauen in westlichen Gesellschaften dient, nutzen rechtskonservative Kräfte den Pornografievorwurf als Rechtfertigung für die Zensur von als deviant empfundenen Identitäten und sexuellen Praktiken.This article...

  12. Sobre Al-Qarmuniyya

    Fierro Bello, María Isabel

    1990-01-01

    [ES] En dos tradiciones escatológicas relativas a al-Andalus y recogidas por 'Abd al-Malik h Haha en su Ta'rg se hace referencia a Carmona. La mención de esta ciudad en dichas tradiciones debe ser puesta en relación con dos episodios de la historia de al-Andalus que tuvieron lugar antes de la muerte de Ibn Habib: la batalla de Carmona en época de 'Abd al-Rahman y la concentración de tropas omeyas en el mismo lugar durante el ataque normando en los años 229-30/844-5.

  13. UN NUEVO DESAFÍO: EL CONTENIDO Y LA ACCESIBILIDAD AL CONTENIDO DE LAS WEB TURÍSTICAS ESPAÑOLAS

    TRINIDAD DOMÍNGUEZ VILA

    2009-01-01

    Full Text Available Internet se ha convertido en una herramienta básica hoy en día, tanto a nivel laboral y relacional como de gestión. Si todo ello es centralizado en la actividad turística, las posibilidades se multiplican, actuando no sólo como una herramienta de información, sino también como gestor y como canal de contratación de productos turísticos de diversa índole, ampliándose el segmento de mercado de referencia al poder ofertar productos más concretos y específicos según las necesidades. Una parte representativa de estos nuevos beneficiarios son las personas con discapacidad, con movilidad-comunicación restringidas temporalmente y las personas mayores que poseen sus capacidades disminuidas y que, por lo tanto, necesitan una serie de adaptaciones, de especificaciones o de modificaciones en relación con los productos turísticos que vayan a consumir. De acuerdo con esto, se formula el estudio de las diferentes páginas web oficiales de turismo de las distintas comunidades autónomas de España, por ser el ente con mayor representatividad de un conjunto de diversos destinos y productos turísticos, mediante el análisis del acceso a los contenidos así como de los contenidos sobre accesibilidad de esas páginas, tomando como referencia el plan de acción que se está ejecutando a este respecto mediante la aplicación del Plan Nacional de Accesibilidad 2004-2012.

  14. Al-Anon/Alateen

    Find an Al-Anon meeting Español | Français 2018 Int'l Convention Home About Group Meetings What If I'm not ready ... a meeting? What can I expect at an Al-Anon meeting? What was my first meeting like? ...

  15. Al - BASED CAST COMPOSITES

    Rakesh Kumar Yadav

    2011-08-01

    Full Text Available The economy is very important feature nowadays in themarket. The researches are playing an important role inengineering field to increase the life of machine parts /components and decrease the cost. The compositematerials have the potential to replace widely used steeland aluminium due to their good characteristics withbetter performance. The Al-based composites have foundextensive applications in automobile industries andaerospace industries due to their increased stiffness,strength, thermal conductivity and wear resistanceproperties. A number of particulate phases have beenemployed in the Al-alloy matrix. The cast aluminiumceramicparticulate composites are finding applications inpistons, connecting rods, cylinder liner, engine cylinderblock, electrical contacts etc.The present investigation isbased on study of the effect of particulate phase on theSEM study, micro-hardness, elastic modulus, tensilestrength and the wear behaviour of Al-5 % SiC-7 % Fe,Al-10 % SiC-6 % Fe and Al-15 % SiC-5 % Fe composites.

  16. [Environmental factors in ALS].

    Juntas-Morales, Raul; Pageot, Nicolas; Corcia, Philippe; Camu, William

    2014-05-01

    ALS is likely to be a disorder of multifactorial origin. Among all the factors that may increase the risk of ALS, environmental ones are being studied for many years, but in the recent years, several advances have pointed to a new interest in their potential involvement in the disease process, especially for the cyanotoxin BMAA. Food containing BMAA has been found on Guam, a well-known focus of ALS/parkinsonism/dementia and high levels of BMAA have been identified into the brain of these patients. The BMAA cyanotoxin is potentially ubiquitous and have also been found into the food of patients who died from ALS both in Europe and USA. BMAA can be wrongly integrated into the protein structure during mRNA traduction, competing with serine. This may induce abnormal protein folding and a subsequent cell death. Heavy metals, such as lead or mercury may be directly toxic for neuronal cells. Several works have suggested an increased risk of ALS in individuals chronically exposed to these metals. Exposure to pesticides has been suggested to be linked to an increased risk of developing ALS. The mechanism of their toxicity is likely to be mediated by paraoxonases. These proteins are in charge of detoxifying the organism from toxins, and particularly organophosphates. To date, there are insufficient scientific data to suggest that exposure to electromagnetic fields may increase the risk of having ALS. We are particularly missing longitudinal cohorts to demonstrate that risk. PMID:24703731

  17. OF THE COMMON GOOD TO THE COMMON GOOD OF HUMANITY. DE LOS BIENES COMUNES AL BIEN COMÚN DE LA HUMANIDAD.

    François Houtart.

    2014-06-01

    Full Text Available There is no place in the world, where a deep discomfort manifests against the increase of the social gaps, to the disrespect for justice, to the unemployment of young people, the abuse of power, and the destruction of nature. A new wave of social movements has been developed. The social forums allowed its globalization. A collective social conscience grows: we cannot continue like this. The kind of economic development that we go thorough today, with its political, psychological, and cultural consequences is the source of the imbalances. At the same time, the need for solutions is essential urgently. It is time to consider new directions and not only adaptations. Gathering forces to act and to think for this purpose, is a priority. This is why, along with the initiative of the Referendum on the water (one of the Common Good in Italy, the Rosa Luxembourg Foundation made the decision to organize a Conference on the concept of the Common Good of Humanity, to promote a reflection on the links between the two concepts and to integrate the demands and social struggles for a change of society, scenario in which this article is framed. RESUMEN: No hay lugar en el mundo, donde un profundo malestar se manifiesta frente al aumento de las brechas sociales, al irrespeto a la justicia, al desempleo de los jóvenes, a los abusos de poder, a la destrucción de la naturaleza. Una nueva ola de movimientos sociales se ha desarrollado. Los Foros sociales permitieron su globalización. Una conciencia social colectiva crece: no se puede seguir así. El tipo de desarrollo económico que vivimos actualmente, con sus consecuencias políticas, culturales y sicológicas, es el origen de los desequilibrios. Al mismo tiempo, la necesidad de soluciones se impone de manera urgente. Es el momento de plantear nuevas orientaciones y no solamente adaptaciones. Reunir fuerzas para actuar y pensar por este fin, es una prioridad. Es por esto que, junto a la iniciativa del Refer

  18. Sociale media als leermiddel

    Rubens, Wilfred

    2012-01-01

    Rubens, W. (2012, 5 juni). Sociale media als leermiddel. Presentatie over het gebruik van sociale media binnen het onderwijs, verzorgd tijdens een ouderraadbijeenkomst van de Katholieke Scholengemeenschap Etten-Leur, Etten-Leur, Nederland.

  19. MDA ALS Caregiver's Guide

    ... R.D., C.N.S.D., L.D.N. Nutritionist MDA/ALS Center at Vanderbilt University Medical Center ... neurologists, physiatrists, therapists (physical, occupa- tional, speech, respiratory), nutritionists, social work- ers, pulmonologists, gastroenterologists and medical equipment ...

  20. Regionale Herkunft als Bonus

    Kratochvil, Dr. Ruth

    2004-01-01

    Der Bio-Sektor durchlebt bewegte Zeiten. Die biologische Landwirtschaft hat sich aus der Nische herausbewegt und dafür an „Besonderheiten“ eingebüßt. Diese müssen als Zusatznutzen wiedergefunden werden.

  1. Factores asociados al bajo peso al nacer

    Georgina J Peraza Roque; Silvia de la C Pérez Delgado; Zoe de los A Figueroa Barreto

    2001-01-01

    El bajo peso al nacer (BPN) ha constituido un enigma en la ciencia a través de los tiempos. Múltiples son las investigaciones realizadas acerca de las causas que lo producen y las consecuencias que provoca. Su importancia no solo radica en lo que significa en la morbilidad y la mortalidad infantil, sino que estos niños tienen habitualmente múltiples problemas posteriores. El Programa para la Reducción del BPN señala que los niños nacidos con un peso inferior a los 2 500 g presentan riesgo de ...

  2. Partizipation als Ausnahmezustand

    Korf, Benedikt

    2009-01-01

    In «Die Erfindung des Politischen» (1993) beschreibt Ulrich Beck Subpolitik als den Ort, an dem die Grenze zwischen Politik und Nichtpolitik verschwindet. Aus der zunehmenden Wirkkraft von Subpolitik erwächst die grundlegende Frage, mit welcher Legitimation diese Art von Subpolitik in die Sphäre der institutionalisierten Politik eindringt. Beck’s Subpolitik soll im Anschluss an theoretische Arbeiten von Chantal Mouffe und Giorgio Agamben als post-politische Aspiration bezeichnet werden, die e...

  3. Der Preis als Kaufbarriere?

    Mueller Loose, Simone

    2012-01-01

    Die Preispolitik hat eine herausragende Stellung im Marketing. Der Preis eines Produktes ist für Verbraucher ein direkter Kostenfaktor und für Unternehmen die Stellgröße im Mar-ketingmix, die den Umsatz am stärksten beeinflusst (vgl. Nieschlag et al. 2002). Wenn die Akzeptanz und der regelmäßige...... Verzehr gesunder Lebensmittel erhöht werden soll, ist es sowohl für die Verbraucherpolitik als auch für Lebensmittelproduzenten wichtig, den Ein-fluss des Preises auf die Kaufentscheidung zu verstehen. Aus Verbrauchersicht ist der Preis neben dem Geschmack die wichtigste Produkteigen-schaft beim Kauf von...... Lebensmitteln (vgl. Brunsø/Grunert 1998) und stellt eine Kaufbarrie-re für Lebensmittel mit gesundheitsfördernden Eigenschaften dar. Studien in den USA (vgl. Cassady et al. 2007), Frankreich (vgl. Drewnowski et al. 2004; Andrieu et al. 2005) und Deutschland (vgl. Karg et al. 2008) kommen übereinstimmend zu dem...

  4. Adaptación curricular de “Programación en Internet”

    Luján Mora, Sergio (coord.)

    2016-01-01

    Trabajo del curso “Adaptaciones Curriculares para la Inclusión de Estudiantes con Necesidades Educativas Especiales” impartido en la Escuela Politécnica Nacional (Quito, Ecuador) del 16 al 22 de marzo de 2016.

  5. Relación entre salud y renuncia al empleo en trabajadoras de la industria maquiladora electrónica de Tijuana

    Guendelman Sylvia

    1999-01-01

    Full Text Available OBJETIVO. Analizar factores de salud, laborales y sociales que contribuyen a renunciar al trabajo en dos maquiladoras transnacionales del ramo electrónico de Tijuana. MATERIAL Y MÉTODOS. Se realizó un estudio de cohorte a 725 mujeres empleadas en una planta japonesa y una estadunidense, entre enero de 1992 y marzo de 1994. La muestra se estratificó en dos intervalos de tiempo ­30 y >30 días laborados. Se efectuó un seguimiento de las mujeres hasta su renuncia o final del periodo de observación, mediante la recolección de información sobre variables de salud, sociales y ocupacionales de diversas fuentes de registro obtenidas de su centro de trabajo. Los motivos de renuncia y la confiabilidad de los datos obtenidos de los registros se estudiaron por medio de entrevistas de seguimiento realizadas a 46% (n= 148 de las trabajadoras que renunciaron y fueron localizadas aproximadamente 12 meses (desviación estándar= 6.7 después de su renuncia. RESULTADOS. La probabilidad acumulativa de renunciar al trabajo fue de 67% en el primer año y de 81% en el segundo. La ausencia de antecedentes laborales previos, turno diurno y nacionalidad de la compañía, resultaron factores predictivos para la renuncia al empleo durante los primeros 30 días. Tabaquismo, antecedentes quirúrgicos y haberse incapacitado por enfermedad general, después de controlar por otras variables, actuaron como factores predictivos para la renuncia posterior a 30 días. En contraposición, la tasa de renuncia posterior a 30 días resultó menor para mujeres con enfermedades crónicas. CONCLUSIONES. La renuncia al empleo en las maquiladoras es elevada y selectiva; en tanto que los factores ocupacionales se asociaron con la renuncia temprana, los relacionados con la salud fueron mejores factores predictivos para la renuncia posterior a los primeros 30 días.

  6. Modification of residual stress in Al-[AlBO]w/Al compound plate

    姜传海; 吴建生; 王德尊

    2001-01-01

    The application of compound parts of Al-[AlBO]w/Al not only reduces the cost of the parts but also improves its properties. However, there is a large thermal residual stress between Al and [AlBO]w/Al, and it is harmful for practical application. From the theoretical analyses and experimental results, it was found that by the compressive pre-plastic deformation perpendicular to the interface between Al and [AlBO]w/Al, the interlayer residual stress of compound parts can be reduced, while the mechanical properties of compound parts can be improved.

  7. Mirar la estructura en al coyuntura: una primera aproximación al análisis de la política exterior del gobierno de Néstor Kirchner (2003-2005)

    Simonoff, Alejandro César

    2006-01-01

    Nos proponemos ver en este trabajo los signos que develen los aspectos estructurales de la política exterior argentina teniéndolos en cuenta y poniéndolos en juego con los planteos iniciales de la administración de Néstor Kirchner, los recursos utilizados y las adaptaciones que se van produciendo. De este modo de interrogación observaremos con mayor claridad la forma y el fondo de nuestras vinculaciones externas.

  8. Altern als Widerstand

    Roberta Maierhofer

    2005-07-01

    Full Text Available Gullettes kulturwissenschaftliche Untersuchung Aged by Culture ist wie bereits ihre zwei vorangehenden Werke, die sich mit Altern beschäftigen – Safe at Last in the Middle Years: The Invention of the Midlife Progress Novel (1988 und Declining to Decline. Cultural Combat and the Politics of the Middle (1997 –, von großem persönlichen Engagement und durch ein politisches Anliegen motiviert. Sowohl die Dringlichkeit als auch der Widerstand, den Gullette, die sich als „age critic“ definiert, als moralische und politische Notwendigkeit postuliert, werden in der Zweiteilung der Abhandlung angesprochen: „Cultural Urgencies“ und „Theorizing Age Resistantly“. Während Gullette den Begriff „aged by culture“ bereits in Declining to Decline einführt, stellt sie ihn nun in den Mittelpunkt ihrer Untersuchung. Das Buch ist einerseits einer gesellschaftspolitischen Analyse der USA gewidmet, andererseits wird eine Theorie des Widerstands gegenüber Altersdiskriminierung entwickelt.

  9. Pornographie als Metapher

    Caroline Schubarth

    2010-03-01

    Full Text Available In diesem Artikel werden unterschiedliche metaphorische Verwendungen des Pornografiebegriffs und deren Implikationen untersucht. Während die Existenz von Pornografie der feministischen Anti-Porno-Bewegung als Erklärung für die anhaltende Diskriminierung von Frauen in westlichen Gesellschaften dient, nutzen rechtskonservative Kräfte den Pornografievorwurf als Rechtfertigung für die Zensur von als deviant empfundenen Identitäten und sexuellen Praktiken.This article examines different metaphorical uses of the term pornography and the resulting implications. While the existence of pornography for the feminist anti-porno movement serves as factor in the continuing discrimination of women in western societies, conservative powers on the right use the allegation of pornography as a justification for censorship of those identities and sexual practices deemed deviant.

  10. Wikipedia als Referenzorgan

    Voß, Jakob

    2006-01-01

    Wikipedia wird inzwischen von vielen Nutzern regelmäßig als Nachschlagewerk genutzt. Aufgrund des offenen Charakters der Online-Enzyklopädie, bei der sich jeder direkt beteiligen kann, ist jedoch zusätzliche Medienkompetenz notwendig, um die Qualität einzelner Wikipedia-Artikel einschätzen zu können. Im Vortrag sollen Methoden zur Beurteilung von Wikipedia-Artikeln dargestellt und die Frage beleuchtet werden, unter welchen Umständen Wikipedia als Referenzorgan geeignet ist.

  11. Diagnósticos al alta hospitalaria de las personas inmigrantes en la ciudad de Valencia (2001-2002

    Salazar Antonio

    2003-01-01

    Full Text Available Fundamento: La inmigración en España se ha incrementado de forma notable en la última década. Por razones teóricas se ha planteado que esta población pudiera ser responsable de un aumento de la incidencia y/o transmisión de enfermedades infecciosas. Sin embargo, existen escasos estudios acerca de las enfermedades de este colectivo que permitan conocer la importancia de esta afirmación. El objetivo de este estudio es cuantificar la atención hospitalaria a esta población en la ciudad de Valencia. Métodos: Se obtuvieron los registros de altas de los Servicios de Admisión de los hospitales públicos de la ciudad de Valencia. Se desarrolló un estudio observacional retrospectivo para el año comprendido entre el 1 de octubre de 2001 al 30 de septiembre del 2002. Resultados: Recuperamos 8.444 ingresos que identificaron 1.577 ingresos de inmigrantes. Se evidenció una proporción similar de inmigrantes registrados con documentación reglada (841, 51,16% e inmigrantes supuestamente no regularizados (803, 48,84%. Predominaron las mujeres (68,3% frente a los varones (31,7% y una media de edad inferior a los 30 años. El diagnóstico de alta más frecuente fue «complicaciones del embarazo, parto y puerperio» con 37,7% del total. Los «traumatismos y envenenamientos», «enfermedades del aparato digestivo» y «enfermedades del aparato respiratorio» representaron el 12,9%, el 7,8% y el 5,4%, respectivamente. Las «enfermedades infecciosas y parasitarias» supusieron el 4,4%. Conclusiones: La proporción de enfermedades infecciosas e infecto-contagiosas observadas no contribuyen a alentar las opiniones difundidas sobre importación o reemergencia de enfermedades desde los colectivos de inmigrantes. La inmigración masiva acaecida requiere múltiples adaptaciones del Sistema de Salud que permitan establecer el perfil de salud de este colectivo, basado en estimaciones poblacionales.

  12. Narrativa breve y cine: técnicas de adaptación

    Castillo Martín, Francisca

    2013-01-01

    Tesis Doctoral centrada en las relaciones entre cine y cuento. Trazamos un recorrido por los principales acercamientos teóricos al fenómeno de las adaptaciones cinematográficas. Abordamos el estudio del cuento y las modalidades de adaptación. Un bloque práctico analiza varias adaptaciones fílmicas internacionales. La segunda parte gira en torno a tres libros de cuentos publicados en España (Obabakoak, Los girasoles ciegos y ¿Qué me quieres, amor?), y sus respectivas adaptaciones.

  13. BERKELEY: ALS ring

    Everybody at Lawrence Berkeley Laboratory's Center for Beam Physics is pleased with the rapid progress in commissioning LBL's Advanced Light Source (ALS) electron storage ring, the foundation for this third-generation synchrotron radiation facility. Designed for a maximum current of 400 mA, the ALS storage ring reached 407 mA just 24 days after storing the first beam on 16 March. ALS construction as a US Department of Energy (DOE) national user facility to provide high-brightness vacuum ultra-violet and soft x-ray radiation began in October 1987. One technical requirement marking project completion was to accumulate a 50-mA current in the storage ring. The ALS passed this milestone on 24 March, a week ahead of the official deadline. Once injected, the electron beam decays quasi-exponentially primarily because of interactions with residual gas molecules in the storage-ring vacuum chamber. Eventually, when the pressure in the vacuum chamber with beam decreases toward the expected operating level of 1 nano Torr, it will only be necessary to refill the storage ring at intervals of four to eight hours. At present the vacuum is improving rapidly as surfaces are irradiated (scrubbed) by the synchrotron radiation itself. At 100 mA, beam lifetime was about one hour (9 April)

  14. Al Shanker Remembers.

    American Educator, 2000

    2000-01-01

    In a 1996 interview shortly before his death, Al Shanker, longtime president of the American Federation of Teachers, discussed such topics as: his own educational experiences; how he learned about political fighting in the Boy Scouts; the appeal of socialism; multinational corporations and the nation state; teaching tough students; and John Dewey…

  15. ALS insertion devices

    The Advanced Light Source (ALS), the first US third generation synchrotron radiation source, is currently under construction at the Lawrence Berkeley Laboratory. The low-emittance, 1.5 GeV electron storage ring and the insertion devices are specifically designed to produce high brightness beams in the UV to soft X-Ray range. The planned initial complement of insertion devices includes four 4.6 m long undulators, with period lengths of 3.9 cm, 5.0 cm (2) and 8.0 cm, and a 2.9 m long wiggler of 16 cm period length. Undulator design is well advanced and fabrication has begun on the 5.0 cm and 8.0 cm period length undulators. This paper discusses ALS insertion device requirements; general design philosophy; and design of the magnetic structure, support structure/drive systems, control system and vacuum system. 18 refs., 9 figs., 5 tabs

  16. De GPS al mapa

    Esteban Dörries

    2016-03-01

    Full Text Available Las coordenadas Lambert obtenidas a partir de mediciones con equipos GPS de mano, llamados a veces navegadores, en ciertos casos confunden al usuario, por diferir claramente de su posición real al ser graficadas en un mapa del Instituto Geográfico Nacional (IGN: Esto puede resolverse con suficiente exactitud mediante una transformación de Molodensky, seguida de la correspondiente proyección cartográfica. Sin embargo, los tres parámetros necesarios para la transformación, supuestamente válidos para Costa Rica, se encuentran en muchas variantes y producen obviamente resultados diferentes. En este trabajo se analizan los fundamentos del problema y sus posibles soluciones, culminando con un estudio comparativo de ocho casos, que permite seleccionar los valores más adecuados para los parámetros.

  17. Acarbose als Carbophor

    Merettig, Nadine

    2014-01-01

    Das Pseudotetrasaccharid Acarbose ist seit 1990 als kompetitiver Inhibitor intestinaler α-Glucosidasen (GlucobayTM/PrecoseTM) in der medizinischen Anwendung bei der Therapie von Diabetes mellitus Typ-2. Charakteristisch für die Struktur der Acarbose ist die Acarviosyleinheit, bei der Valinamin und Desoxyglucose N-glycosidisch verknüpft sind; des Weiteren ist an die Acarviosyleinheit ein Maltosylrest gebunden. Der Inhibitoreffekt beruht auf der irreversiblen Bindung zwischen ...

  18. Augmented Reality als Bildungsenhancement?

    Damberger, Thomas

    2015-01-01

    Die Realität, die sich mithilfe von Datenbrillen und Smartphone Applikationen in die virtuelle Welt hinein ausdehnt, erfährt eine Form des Enhancements. Ein solches Enhancement kann unter bestimmten Voraussetzungen als Bildungsenhancement verstanden werden. Der Text befasst sich mit Formen der erweiterten Realität, ferner mit dem, um was es wesentlich bei der Bildung geht und zuletzt mit den Bedingungen, die erforderlich sind, um diesem Wesentlichen mit Hilfe von augmented reality besser zum ...

  19. Carta al editor

    Harry Pachajoa

    2012-01-01

    Recently, Valencia et al., published a very interesting article called «Lipid profile in a group of patients with Turner’s syndrome at Clínica Universitaria Bolivariana in the city of Medellín between 2000 and 2009". An article which evaluated lipid levels in patients withTurner syndrome in a Colombian clinic, the study associated results of lipid profile with karyotype and other risk factors for coronary heart disease.

  20. Las Inteligencias Múltiples como marco para atender a los alumnos con adaptaciones curriculares no significativas

    Martí-Saumell, Núria

    2012-01-01

    Nuestra investigación se centra en estudiar las metodologías educativas que facilitan la atención a la diversidad desde la perspectiva de la Teoría de las Inteligencias Múltiples y con una orientación teórico-práctica. El objetivo de nuestro estudio será analizar y seleccionar aquellas metodologías educativas que facilitan la atención a la diversidad dentro del aula, así como analizar el marco que ofrece la Teoría de las Inteligencias Múltiples para atender a la diversidad. A partir de estos ...

  1. Adaptaciones de unidades de aprendizaje en tiempo de ejecución

    Zarraonandia Ayo, Telmo Agustín

    2007-01-01

    La presente tesis doctoral se enmarca dentro del conjunto de trabajos relacionados con procesos de aprendizaje asistido por ordenador en los cuales es necesaria la figura de un tutor o instructor que supervise el proceso. Si bien, a día de hoy, en algunos tipos de procesos esta figura puede ser reemplazada por algún tipo de agente inteligente o algún otro mecanismo, en otros casos sigue siendo aún necesario y conveniente que el control y supervisión del proceso esté en manos de...

  2. AL-USRCRN Station Information

    National Oceanic and Atmospheric Administration, Department of Commerce — Documentation of United States Alabama Regional Climate Reference Network (AL-USRCRN) installations in 2006. Installations documented are for AL-USRCRN pilot...

  3. Derivados vinculados al seguro.

    De Paz Cobo, Sonia

    2003-01-01

    Full Text Available El presente trabajo tiene como objetivo la presentación de los derivados financieros como instrumentos de cobertura de los riesgos del seguro, así como de los principales proyectos que se desarrollan a través de los mismos, como por ejemplo los derivados sobre el clima. Hay que tener presente las pérdidas multimillonarias ocasionadas en casos como el de la banca Baring’s, o el de Orange County, por citar algunas, que si bien ciertos autores afirman que están en relación directa con el uso de estos productos, no podemos olvidar que los instrumentos derivados se desarrollaron con el objetivo principal de proteger al usuario de la posible volatilidad del activo subyacente. Ya en la industria aseguradora los derivados vinculados a tal actividad son instrumentos donde el pago se condiciona a la ocurrencia de su suceso de siniestro, o serie de sucesos múltiples que disparen las pérdidas. Tras el repaso efectuado y la descripción que este tipo de instrumentos puede tener en la gestión del riesgo por parte de la industria aseguradora, concluiremos con la exposición de las relaciones con el reaseguro tradicional así como una breve referencia al futuro de este tipo de instrumentos

  4. Gliricidia sepium al establecimiento

    J. L. Valle

    2004-01-01

    Full Text Available Se asoció Cenchrus ciliaris (Cc y Gliricidia sepium (Gs para evaluar la producción de biomasa y la composición química de los forrajes en la fase de establecimiento, en el estado de Morelos, México, en condiciones de trópico seco. Se empleó un análisis de varianza con diseño en bloques al azar, en donde T1 fue pasto solo, T2 Cc más Gs con 5,000 plantas ha-1 y el T3 Cs más Gs con 14,285 plantas ha-1. Se midió la producción de forraje individual y asociado con materia seca (t MS/Ha, la altura (A en cm, la proteína cruda (PC%, las fracciones de fibra (FDN% y FDA% y la digestibilidad in vitro de la materia seca (DIVMS%. El T3 tuvo una mejor producción de biomasa (P0.05. La asociación de 14,285 plantas ha-1 de G. sepium con pasto Cenchrus ciliaris mejoró la producción de biomasa y la disponibilidad total de nutrientes por superficie cultivada al establecimiento

  5. Epitaxial growth of Al/Al2O3 multilayer structures

    In order to obtain Al-Al2O3 quantum effect devices, it is necessary to deposit epitaxially Al on Al2O3 and Al2O3 on Al. We have already obtained an epitaxial Al/Al2O3/Al structures on Si(111). In this paper, we have deposit Al/Al2O3/Al structures on Si(111), and investigated the crystallinity by using RBS. (author)

  6. Doppelthydrophile Blockcopolymere als Mineralisationstemplate

    Kasparova, Pavla

    2002-07-01

    Die vorliegende Arbeit beschäftigt sich mit der Synthese und den Eigenschaften von doppelthydrophilen Blockcopolymeren und ihrer Anwendung in einem biomimetischen Mineralisationsprozeß von Calciumcarbonat und Bariumsulfat. Doppelthydrophile Blockcopolymere bestehen aus einem hydrophilen Block, der nicht mit Mineralien wechselwirkt und einem zweiten Polyelektrolyt-Block, der stark mit Mineraloberflächen wechselwirkt. Diese Blockcopolymere wurden durch ringöffnende Polymerisation von N-carboxyanhydriden (NCA's) und a-methoxy-ω-amino[poly(ethylene glycol)] PEG-NH2 als Initiator hergestellt. Die hergestellten Blockcopolymere wurden als effektive Wachstumsmodifikatoren für die Kristallisation von Calciumcarbonat und Bariumsulfat Mineralien eingesetzt. Die so erhaltenen Mineralpartikel (Kugeln, Hantel, eiförmige Partikel) wurden durch Lichtmikroskopie in Lösung, SEM und TEM charakterisiert. Röntgenweitwinkelstreuung (WAXS) wurde verwendet, um die Modifikation von Calciumcarbonat zu ermitteln und die Größe der Calciumcarbonat- und Bariumsulfat-Nanopartikel zu ermitteln. This work describes the synthesis and characterization of double hydrophilic block copolymers and their use in a biomimetic mineralization process of Calcium Carbonate and Barium Sulfate. Double hydrophilic block copolymers consist of a hydrophilic block that does not interact with minerals and another hydrophilic polyelectrolyte block that strongly interacts with mineral surfaces. These polymers were synthesised via ring opening polymerisation of N-carboxyanhydride (NCA), and the first hydrophilic block a-methoxy-ω-amino[poly(ethylene glycol)] PEG-NH2 was used as an initiator. The prepared block copolymers were used as effective crystal growth modifiers to control the crystallization of Calcium Carbonate and Barium Sulfate minerals. The resulting mineral particles (spheres, dumbbells, egg-like particles) were characterised by light microscopy in solution, by SEM, and by TEM. X-Ray scattering

  7. Fretting wear performances of multilayered PVD TiAlZrN/TiAlN/TiAl on AISI 4140 steel

    Tlili, Brahim; NASRI, Mustapha; F. Ayari; Nouveau, Corinne

    2008-01-01

    Nowadays, most surface treatments are realized through vapor deposition techniques as thin hard coatings to guarantee; high surface hardness, low friction coefficient and improve wear resistance. Several experimental investigations have let to the development of a (TiAlCN/TiAlN/TiAl) and (TiAlZrN/TiAlN/TiAl) coatings in preference to the traditional TiN coating. In the current paper research conducted on fretting wear of a (TiAlCN/TiAlN/TiAl) and a (TiAlZrN/TiAlN/TiAl) multilayer coatings de...

  8. Malamih al-Ashwat al-'Arabiyyah wa Makharijaha

    Amrah Muhammad Kasim

    2015-12-01

    Full Text Available This writing discusses on al-ashwat al-‘arabiyyah that is known with “phonetic” term. It talks and interprets makharij al-huruf or place for producing sounds and also processing production of sounds by parts of mouth in Arabic language. The problems of sounds and its systems in Arabic language have been conducted by the scholars of al-ashwat al-‘arabiyyah attractively, neatly, and detail and gotten ahead the phonetic western scholars. Part of their analysis results formulate the study about al-ashwat al-sakinah (al-Shamit is known with vocal and consonant sounds in research questions shawait – shawamit. Ibnu Jinni has formulated “harakat”(wowel in Arabic language and dimension of letter  mad and liyn on alif  letter - waw - ya’ (ا و ي, from these letters create  harakat fathah, dammah, and kasrah. Moreover, in this writing also exist the description of hija’i letters and its makhraj that are correct from parts of mouth and the unity of coordinative sounds that produce sounds in morphemes arrangement, in one word that produces meaning. The result of phonological study has divided al-ashwat to be kinds of sound like the pronounced sounds, produced sounds from mouth, and heard sound.

  9. Editorial: Cartas al Editor

    Guillermo Llanos

    2006-06-01

    Full Text Available En todas las revistas biomédicas del mundo existe una sección habitual denominada como el título de este editorial y que en Colombia Médica la llamamos correspondencia. Este espacio tiene como objetivo fundamental que los lectores escriban a los autores (investigadores comentando los artículos que se han publicado en números anteriores de la revista. Las cartas son, entonces, breves comentarios de desacuerdo o acuerdo (conceptual, metodológico, interpretativo sobre falencias ubicadas por un lector alerta al tema debatido en cualquiera de las secciones como en los artículos originales, editoriales, revisiones, presentación de casos, etc. publicados previamente en la revista. Las cartas deben permitir el intercambio de opiniones y formas de pensar y analizar los problemas planteados entre los autores y los lectores. En ocasiones una serie de cartas motivadas por un artículo original puede ser tan o más interesante como el artículo que generó la correspondencia. Las cartas son también un formato adecuado para comunicar un hecho novedoso de una observación clínica juiciosa no descrita antes. Un ejemplo de ello es la carta de un gineco-obstetra australiano cuando informó a Lancet los primeros efectos adversos informados de la talidomida. Colombia Médica, a pesar de mantener vigente esta sección, no ha sido muy afortunada en establecer una buena cultura del envío de cartas al editor. Pero últimamente han llegado juiciosas observaciones a las cuales se les ha dado prioridad en su publicación. Toda carta que comenta los hallazgos de un artículo es enviada a los autores para su respuesta, porque ello genera el debate académico buscado, y luego se publican, tanto la carta como su respuesta. El Estilo Vancouver recomienda que la carta y su respuesta deban ser breve, no pasar de dos o tres párrafos y contener sólo cuatro o cinco referencias. En lo posible (a menos que sea indispensable no presentar ni cuadros ni gráficos. El t

  10. La música popular de la literatura al cine: lenguaje, discurso y significados en Alta Fidelidad y The Commitments

    Viñuela Suárez, Eduardo

    2010-02-01

    Full Text Available Adapting a novel into a film is not a simple question of translating the narrative plot from one medium to another, it also deals with the cultural competence of the reader / spectator and the meanings and discourses articulated in the interpretation of the texts. Music is present in both novels and films, and so it participates in the process of creating meanings, even when it does not take part in the formal structure of the text. This article develops the analysis of popular music in The Commitments and High Fidelity, two films based on two novels where the ideology of rock music influences both characters and spaces. Songs, musicians and instruments are present in prose, dialogues, sound and image, both in the novels by Roddy Doyle and Nick Hornby, respectively, and in the films directed by Alan Parker and Stephen Frears, thus demonstrating the multimedia condition of music and its capability to interact with the narrative structure of the texts in the articulation of several discourses.

    La adaptación cinematográfica de novelas va más allá de la transposición de la narrativa de un medio de expresión a otro e implica a una serie de discursos que están presentes en la obra y que son activados por el lector-espectador en función de su competencia cultural. La música, presente en ambos medios, es capaz de vehicular mensajes que, aunque no se encuentren en la estructura narrativa de las obras, participan en la creación de significados. En este artículo abordamos un análisis formal y discursivo de la música popular en Alta fidelidad y The Commitments, dos novelas adaptadas al cine en las que la ideología de la cultura rock se manifiesta en personajes y espacios. Canciones, músicos e instrumentos aparecen en texto escrito, diálogos, imagen y sonido en las novelas de Roddy Doyle y Nick Hornby y sus respectivas adaptaciones cinematográficas de Alan Parker y Stephen Frears, demostrando la condici

  11. Alexandria (Al Iskandariya), Egypt

    2002-01-01

    This image of Alexandria was taken by astronauts on board the International Space Station in December 2000 using an Electronic Still Camera. A wider-angle view (STS088-739-90) taken from the Space Shuttle in December 1998 is available for context. Alexandria (Al Iskandariya) occupies a T-shaped peninsula and strip of land separating the Mediterranean from Lake Mariout. Originally the town was built upon a mole (stone breakwater) called Heptastadium, which joined the island of Pharos (see referenced website, below) to the mainland. Since then sedimentary deposits have widened the mole. Since 1905, when the 370,000 Alexandrians lived in an area of about 4 sq km between the two harbors, the city (population 4 million; see referenced website, below) has grown beyond its medieval walls and now occupies an area of about 300 sq km. The Mahmudiya Canal, connecting Alexandria with the Nile, runs to the south of the city and, by a series of locks, enters the harbor of the principal port of Egypt (note ships). The reddish and ochre polygons west of Lake Mariout are salt-evaporation, chemical-storage, and water-treatment ponds within the coastal lagoon. Reference Youssef Halim and Fatma Abou Shouk, 2000, Human impacts on Alexandria's marine environment: UNESCO, Coastal Regions and Small Islands Unit (CSI), Coastal Management Sourcebooks 2 (accessed December 20, 2000) Additional photographs taken by astronauts can be viewed at NASA-JSC's Gateway to Astronaut Photography of Earth. Image ISS001-ESC-5025 provided by the Earth Sciences and Image Analysis Laboratory, Johnson Space Center.

  12. Undulators at the ALS

    At Lawrence Berkeley Laboratory's (LBL) Advanced Light Source (ALS), three 4.6 m long undulators have been completed, tested and installed. A fourth is under construction. The completed undulators include two 5.0 cm period length, 89 period devices (U5.0s) which achieve a 0.85 T effective field at a 14 mm minimum gap and a 8.0 cm period length, 55 period device (U8.0) that reaches a 1.2 T effective field at a 14 mm minimum gap. The undulator under construction is a 10.0 cm period length, 43 period device (U10.0) that is designed to achieve 0.98 T at a 23 mm gap. Undulator magnetic gap variation (rms) is within 25 microns over the periodic structure length. Reproducibility of the adjustable magnetic gap has been measured to be within +/- 5 microns. Gap adjusting range is from 14 mm to 210 mm, which can be scanned in one minute. The 5.1 m long vacuum chambers are flat in the vertical direction to within 0.74 mm and straight in the horizontal direction to within 0.08 mm over the 4.6 m magnetic structure sections. Vacuum chamber base pressures after UHV beam conditioning are. in the mid 10-11 Torr range and storage ring operating pressures with full current are in the low 10-10 Torr range. Measurements show that the uncorrelated magnetic field errors are 0.23%, and 0.20% for the two U5.Os and the U8.0 respectively and that the field integrals are small over the 1 cm by 6 cm beam aperture. Device description, fabrication, and measurements are presented

  13. Gestión avanzada de turnos para la interacción natural

    Valle Agudo, David del

    2012-01-01

    A medida que la tecnología gana en complejidad y se extiende a más aspectos de nuestras vidas, se requiere de ella que se haga, a la vez, más transparente y accesible para las personas. Es por ello que cada vez toman mayor relevancia los denominados Sistemas de Interacción Natural, enmarcados en la interacción hombre máquina, cuyo objetivo es el de hacer accesible la tecnología a los usuarios a través de los mismos modos, códigos y procedimientos que los humanos utilizan de forma natural para...

  14. Epistemologi Sufi : Perspektif Al-Hakim Al-Tirmidzi

    Ainul Abidin Shah

    2012-06-01

    Full Text Available Abstract : This article deals with some epistemological terms and theoretical postulates in the thought of a well known sufi  from the 9th century AD., Abu `Abdu’lLah Muhammad b. `Ali al-Hakim al-Tirmidzi, in order to describe the path (sulūk of a sufi towards the Ultimate Reality. In his own style thought about the sufis, placing an emphasis upon the strong relations between the walāyah (sufi  sainthood and the ma`rifa (sufi knowledge in the one side, and between the two a philosophy of Sufi Ethics. So, it is nothing out of the ordinary to fi nd his ethical inclinations as a dominant feature in every aspect of his epistemological thoughts. In addition, sufi epistemology in the perspective of philosophers focuses on enforcing the inner positive potents of the Self more so than to eliminate “the satanic influences” to the heart, because – in al-Tirmidzi’s argument is that the former would greatly improve the immunity of the self, and encourage it to tread consistently on the right path as well.Keywords :  Dhawq, eros, heart, exoteric, esoteric, al-Haqq, al-`Adl, al-Shidq Abstrak : Artikel ini membahas istilah-istilah epistemologi dan beberapa postulat dari seorang sufi terkenal abad ke-9, Abu `Abdu’lLahMuh ammad b.`Ali al-Hakim al-Tirmidzi, dalam upaya menggambarkan perjalanan suluk seorang sufi menuju Realitas Mutlak. Dalam gaya pemikirannya tentang sufi, kita menemukan bahwa figur ini cenderung  menekankan hubungan-hubungan yang kuat antara wal āyah (kewalian sufi dan ma‘rifa (pengetahuan sufi di satu sisi, dan antara keduanya dengan filsafat moral sufi.  Jadi, tidak aneh jika kita menemukan kecenderungan - kecenderungan etis yang dominan dalam setiap aspek  pemikiran epistemologinya. Dan epistemologi sufi dalam perspektif para filsuf lebih menekankan potensi inner Diri yang positif daripada menghapuskan “cara-cara syaitan” dalam hati, karena - menurut pendapat al-Tirmidzi – ia akan meningkatkan

  15. El miedo al rey

    François FORONDA

    2007-01-01

    Full Text Available La peur du roi. Sources et premières réflexions à propos d’une émotion aristocratique dans la Castille du XIVe siècleFace à un roi qui à présent pousse les effets de son ire jusqu’au meurtre pour faire le vide autour de lui et imposer sa différence souveraine, ses parents et les riches hommes, soit les principaux visés par cette politique de l’arbitraire qui enfreint les règles du jeu autant qu’elle contribue à les redéfinir, disent la peur (metus qu’ils ressentent, qu’ils utilisent aussi afin de donner à leur stratégie de pouvoir un fondement légitime. Et l’expression de cette émotion politique, qui tend à se muer en un stéréotype d’un discours aristocratique d’opposition, surtout présente dans les chroniques, mises ici en relation ici avec d’autres sources, notamment des correspondances, marque profondément l’histoire des relations souvent conflictuelles au sein de cette compagnie en définitive très étroite pendant un siècle, de la fin du XIIIe siècle à la fin du XIVe siècle. Cet article se propose d’ébaucher une première réflexion sur le sujet et d’en présenter les principales sources.El miedo al rey. Fuentes y primeras reflexiones acerca de una emoción aristocrática en la Castilla del siglo XIVFrente a un rey que ahora lleva hasta la muerte los efectos de su ira para hacer el vacío entorno a su persona e imponer su soberana, sus parientes y ricos hombres, o sea los principales afectados por esta política de la arbitrariedad que rompe las reglas del juego a la vez que contribuye a redefinirlas, dicen el miedo (metus que sienten, que utilizan también para darle a su estrategia de poder un fundamento legítimo. Y la expresión de esta emoción política, que tiende a convertirse en un estereotipo de un discurso aristocrático de oposición, sobre todo presente en la crónicas, aquí puestas en relación con otras fuentes, en particular cartas, marca profundamente la historia de

  16. El pensamiento frente al arte

    Bergmann, Antonio

    2012-01-01

    Es un hecho histórico de gran importancia el que el hombre haya creado arte antes de haberse dedicado a la filosofía. Al mencionar esto no pienso en las pinturas pre-históricas que se encuentran en las cuevas de España y en el Sur de Francia, sino ante todo, en el arte egipcio y mesopotámico.  En Egipto y Mesopotamia --y Mesopotamia parece ser la región más importante -no nació sino que se creó al hombre humano, al hombre como ser arquitectónico.

  17. Consoer et al PFOS dataset

    U.S. Environmental Protection Agency — This ScienceHub entry was developed for the published paper: Consoer et al., 2016, Toxicokinetics of perfluorooctane sulfonate in rainow trout (Oncorhynchus...

  18. DESAFÍOS AL ORDEN

    Evangelina De los Rios

    2012-03-01

    Full Text Available Fradkin, Raúl y Gelman, Jorge (Compiladores, Desafíos al Orden. Política y sociedades rurales durante la Revolución de Independencia, Prohistoria ediciones, Rosario, 2008, 157 pp.

  19. Seltzer_et_al_2016

    U.S. Environmental Protection Agency — This dataset supports the modeling study of Seltzer et al. (2016) published in Atmospheric Environment. In this study, techniques typically used for future air...

  20. Note intorno al Teatro Vagante

    Scabia, Giuliano

    2013-01-01

    In questo testo-intervista Scabia traccia, alternando racconto e riflessione, un percorso che abbracciatutta l'attività del suo Teatro Vagante: dalle azioni nelle scuole degli inizi degli anni '70 - agli alboridell'Animazione Teatrale, che anche da qui prese le mosse - al lavoro all'Università di Bologna,organica continuazione di quei primi esperimenti. Dalla poesia alle azioni teatrali in strada;dall'architettura della pagina al respiro della parola detta in presenza ; dalle aule ...

  1. Information als Gegenstand von Informationskompetenz

    Ingold, Marianne

    2011-01-01

    Der Informationsbegriff als zentraler Gegenstand von Informationskompetenz wird in der bibliothekarischen Diskussion in der Regel nicht explizit thematisiert, sondern lässt sich aus Fachliteratur und Bibliothekspraxis nur implizit erschließen. Eine theoretische Beschäftigung mit dem Informationsbegriff ist jedoch unabdingbar, soll das Konzept "Informationskompetenz" auch außerhalb des bibliothekarischen Kontextes verständlich und nutzbar gemacht werden. Im vorliegenden Text, der sich als Beit...

  2. Response to Brosch et al.

    Pihlajamäki, Jussi; Lerin, Carles; Kaminska, Dorota; Venesmaa, Sari; Itkonen, Paula; Boes, Tanner; Floss, Thomas; Schroeder, Joshua; Dearie, Farrell; Crunkhorn, Sarah; Burak, Furkan; Jimenez-Chillaron, Josep C.; Kuulasmaa, Tiina; Miettinen, Pekka; Park, Peter J.

    2012-01-01

    We would like to respond to Brosch et al. regarding our manuscript “Expression of the Splicing Factor Gene SFRS10 Is Reduced in Human Obesity and Contributes to Enhanced Lipogenesis” (Pihlajamäki et al., 2011b). Brosch performed RT-PCR in liver samples from 13 lean and 34 obese individuals, finding no differences in SFRS10 or LPIN1 expression. We wish to address points raised by Brosch, including experimental strategy and analysis of human SFRS10 expression.

  3. D’al-Ẓāhir Baybars à ʿAlī al-Zaybaq

    Dorlian, Georges

    2014-01-01

    « Toi par le courage, moi par la filouterie » aimait répéter Baṭṭāl à la princesse Ḏāt al-Himma, comme pour délimiter les espaces d’action revenant à chacun. Et d’ajouter, pour mieux dépeindre son rôle : « Mon métier n’est pas celui de la guerre, des armes et des exploits, mais celui de la ruse et de la fourberie dans un château fort ou une forteresse. » Baṭṭāl était un ʿayyār adjoint à la princesse Ḏāt al-Himma et à ʿAbd al-Wahhāb pour servir leur cause sublime et leur idéal chevaleresque. E...

  4. Strain sensing with sub-micron sized Al-AlOx-Al tunnel junctions

    Koppinen, P. J.; Lievonen, J. T.; Ahlskog, M.; Maasilta, I. J.

    2009-01-01

    We demonstrate a local strain sensing method for nanostructures based on metallic Al tunnel junctions with AlOx barriers. The junctions were fabricated on top of a thin silicon nitride membrane, which was actuated with an AFM tip attached to a stiff cantilever. A large relative change in the tunneling resistance in response to the applied strain (gauge factor) was observed, up to a value 37. This facilitates local static strain variation measurements down to ~10^{-7}.

  5. Epistemologi Sufi : Perspektif Al-Hakim Al-Tirmidzi

    Ainul Abidin Shah

    2012-01-01

    Abstract : This article deals with some epistemological terms and theoretical postulates in the thought of a well known sufi  from the 9th century AD., Abu `Abdu’lLah Muhammad b. `Ali al-Hakim al-Tirmidzi, in order to describe the path (sulūk) of a sufi towards the Ultimate Reality. In his own style thought about the sufis, placing an emphasis upon the strong relations between the walāyah (sufi  sainthood) and the ma`rifa (sufi knowledge) in the one side, and between the two a philosophy of Sufi Et...

  6. Al clamor de les vuvuzeles

    Javier Olivera Betrán

    2010-09-01

    Full Text Available El Mundial de Futbol de Sud-àfrica ha situat l’Àfrica al mapa mundial i ha mostrat al món el triomf de l’estil de futbol d’Espanya basat en la col·lectivitat, l’esperit d’equip, la humilitat, la cohesió interna i el joc bonic. L’organització africana, seriosa i eficaç, ha sabut mobilitzar i il·lusionar la població del país que ha participat en el mundial des de l’orgull de ser africà, amb l’esperit alegre, festiu i també reivindicatiu de la gent de l’Àfrica. Aquest esdeveniment suposa el llançament de la marca “Sud-àfrica” al món amb un avís clar d’optar a l’organització d’uns primers Jocs Olímpics a Àfrica (potser els de 2020. S’obre una finestra d’esperança al segle xxi per al continent perdut de la mà de l’esport espectacle tan universal, massiu, emocional i mercantil que també es juga a la canxa de la política i de l’economia.

  7. A united refinement technology for commercial pure Al by Al-10Ti and Al-Ti-C master alloys

    Because flake-like TiAl3 particles in Al-Ti-C master alloys prepared in a melt reaction method dissolve slowly when they are added into Al melt at 720 deg. C, Ti atoms cannot be released rapidly to play the assistant role of grain refinement, leading to a poor refinement efficiency of Al-Ti-C master alloys. A united refinement technology by Al-10Ti and Al-Ti-C master alloys was put forward in this paper. The rational combination of fine blocky TiAl3 particles in Al-10Ti and TiC particles in Al-Ti-C can improve the nucleation rate of α-Al. It not only improves the grain refinement efficiency of Al-Ti-C master alloys, but also reduces the consumption

  8. Modeling of the ALS linac

    The ALS injector linac is used for the Beam Test Facility (BTF) and the Damping Experiments when it is available in between the ALS filings. These experiments usually require higher quality beams and a better characterization than is normally required for ALS operations. This paper focuses on the beam emittance, energy tilt, and especially the longitudinal variation of the beam parameters. For instance, the authors want to avoid longitudinal variations at the low beta section of the BTF. On the other hand, a large energy tilt is required for post-acceleration compression of the bunch using an alpha magnet. The PARMELA code was modified to calculate and display longitudinal variations of the emittance ellipse. Using the Microsoft Development Studio under Windows NT environment the code can handle a much larger number of particles than was previously possible

  9. Conjuntivitis alérgica

    Alejandro Tello Hernández

    2008-07-01

    Full Text Available La conjuntivitis alérgica es una de las causas más comunesde consulta externa en oftalmología y tiene una muy altarelación con las reacciones alérgicas sistémicas. Lafisiopatología de las reacciones de hipersensibilidad noshace entender los cuadros clínicos característicos de estapatología y sus diferentes grados de severidad. Eldiagnostico diferencial es amplio, sin embargo hay clavesdiagnosticas que nos orientan rápidamente al diagnosticocorrecto. El tratamiento se enfoca en las medidasfarmacológicas y no farmacológicas, utilizándolas enconjunto para disminuir la recurrencia del cuadro y prevenirsecuelas visuales.

  10. ALS:A SAIRASTAVAN TOIMINTATERAPIA

    Vuorinen, Johanna

    2013-01-01

    Amyotrofinen lateraali skleroosi on harvinainen, etenevä sairaus. Sairaus surkastuttaa edetessään potilaan tahdonalaisen lihaksiston. Sairauden oireet näkyvät yleensä ensin raajoissa, mutta myös nielun lihaksista alkava bulbaarinen taudinmuoto on mahdollinen. ALS voi myös aiheuttaa frontotemporaalista dementiaa. Sairaus etenee yksilöllisesti, mutta sen kesto on yleensä noin 3-5 vuotta. Keski-Suomen keskussairaalassa ALS:n sairastuneen kuntoutukseen osallistuu moniammatillinen työryhmä, j...

  11. Generation and evolution of nanoscale AlP and Al13Fe4 particles in Al-Fe-P system

    Highlights: • Diffusion and gradual solid reactions between Al and FexP phases in Al-Fe-P alloy were investigated. • Nanoscale AlP clusters are in-situ generated and evolve during the whole process. • This novel Al-Fe-P alloy has an excellent low-temperature refining performance on hypereutectic Al-Si alloy. - Abstract: In this paper, the gradual solid reactions between Al and FexP phases in Al-Fe-P alloy were investigated. The results show that the whole reaction process undergoes four main stages: the diffusion of Al atom, the generation of (Al, Fe, P) intermediate compound, the precipitation of nano AlP and Al13Fe4 clusters and their growth to submicron particles. The microstructure of Fe-P particles evolves from the “egg-type”, the “sponge-type” to the “sesame-cake” structure. AlP and Al13Fe4 nano phases have in-situ generated and evolved during the whole process. The gradual reaction mechanism has been discussed. Furthermore, a novel Al-Fe-P alloy which contains (Al, Fe, P) intermediate compounds and nano AlP particles has been synthesized and its low-temperature refining performance on A390 alloy has also been investigated

  12. Dynamic Modeling of ALS Systems

    Jones, Harry

    2002-01-01

    The purpose of dynamic modeling and simulation of Advanced Life Support (ALS) systems is to help design them. Static steady state systems analysis provides basic information and is necessary to guide dynamic modeling, but static analysis is not sufficient to design and compare systems. ALS systems must respond to external input variations and internal off-nominal behavior. Buffer sizing, resupply scheduling, failure response, and control system design are aspects of dynamic system design. We develop two dynamic mass flow models and use them in simulations to evaluate systems issues, optimize designs, and make system design trades. One model is of nitrogen leakage in the space station, the other is of a waste processor failure in a regenerative life support system. Most systems analyses are concerned with optimizing the cost/benefit of a system at its nominal steady-state operating point. ALS analysis must go beyond the static steady state to include dynamic system design. All life support systems exhibit behavior that varies over time. ALS systems must respond to equipment operating cycles, repair schedules, and occasional off-nominal behavior or malfunctions. Biological components, such as bioreactors, composters, and food plant growth chambers, usually have operating cycles or other complex time behavior. Buffer sizes, material stocks, and resupply rates determine dynamic system behavior and directly affect system mass and cost. Dynamic simulation is needed to avoid the extremes of costly over-design of buffers and material reserves or system failure due to insufficient buffers and lack of stored material.

  13. Cathodic electrochemiluminescence at double barrier Al/Al2O3/Al/Al2O3 tunnel emission electrodes

    Double insulating barrier tunnel emission electrodes were fabricated by adding a new pure aluminum layer upon oxidized aluminum electrodes by vacuum evaporation and thermally oxidizing the new aluminum layer in air at room temperature. Resulting Al/Al2O3/Al/Al2O3 electrodes allow the use of various aluminum alloys in the electrode body necessary for hardness or shaping ability of the electrode while obtaining the luminescence properties of pure aluminum oxide. During electrical excitation of luminescent labels by cathodic hot electron injection into aqueous electrolyte solution, the background noise is mainly based on high-field-induced solid-state electroluminescence and F-center luminescence of the outer aluminum oxide film. The more defect states and/or impurity centers the outer oxide film contains, the higher is the background emission intensity. The present electrode fabrication method provides a considerable improvement in signal-to-noise ratio for time-resolved electrochemiluminescence (TR-ECL) measurements when the original native oxide film of the electrode body contains luminescence centers displaying long-lived luminescence. The excellent performance of the present electrodes is demonstrated by extremely low-level detection of Tb(III) chelates, luminol, Pt(II) coproporphyrin and Tb(III) labels in an immunometric immunoassay by time-resolved electrochemiluminescence

  14. Derecho humano al agua y al saneamiento: derechos estrechamente vinculados al derecho a la vida

    Fernández Aller, Maria Celia; Luis Romero, Elena de; Guzmán Acha, Cristina

    2013-01-01

    Los derechos humanos al agua y al saneamiento están íntimamente relacionados con otros derechos esenciales para la vida, como la alimentación o la salud. Su reconocimiento como derechos humanos en 2010 marca un hito importante en el respeto, protección y realización de estos derechos, que se encuentran seriamente vulnerados para una mayoría de población más vulnerable y empobrecida, sobre todo en el ámbito rural. Mucho camino queda aún para conseguir no sólo la disponibilidad de agua y saneam...

  15. Personalidad y tolerancia al dolor

    JESÚS M.ª CARRILLO

    2005-01-01

    Full Text Available Se examina la relación de algunas variables de personalidad -EPQ-A (Eysenck y Eysenck, 1975, NEO-PI (McCrae y Costa, 1988 y STA -personalidad esquizotípica- y STB -personalidad límite-, de Claridge y Broks (1984, con la tolerancia al dolor experimental inducido mediante agua fría (cold pressor test, según el procedimiento de Staats, Heckmat y Staats (1998 en una muestra filtrada mediante un cuestionario sobre dolor crónico, dolores de cabeza, de espalda, artritis, síndrome de Raynaud, y personas bajo medicación. La tolerancia al dolor experimental se evaluó mediante el Umbral del dolor (tiempo en segundos desde la introducción de la mano en el agua hasta el primer informe de dolor, Mantenimiento del dolor (duración en segundos de la inmersión de la mano desde la aparición del umbral hasta su retirada y Tolerancia al dolor (duración total en segundos de la inmersión de la mano desde su introducción hasta su retirada. Un análisis correlacional, factorial y de regresión por pasos mostraron un efecto cruzado entre medidas de ansiedad (tolerancia negativa al dolor y psicoticismo, siendo psicoticismo junto con control emocional predictores de tolerancia positiva al dolor. En cuanto a psicoticismo, parece que son sus elementos de naturaleza paranoide y de "dureza" los que afectan a una percepción atenuada del dolor.

  16. 75 FR 62858 - United States, et al.

    2010-10-13

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF JUSTICE Antitrust Division United States, et al. v. American Express Company, et al.; Proposed Final Judgment and... of America, et al. v. American Express Company, et al., Civil Action No. CV-10-4496. On October...

  17. 76 FR 38700 - United States, et al.

    2011-07-01

    ... published in the Federal Register on October 13, 2010 (75 FR 62858); and (3) published summaries of the... Antitrust Division United States, et al. v. American Express Company, et al.; Public Comments and Response... Final Judgment in United States, et al. v. American Express Company, et al., Civil Action No....

  18. Al/Au/n-Si/Al surface barrier detector

    Charged-particle detectors are required to be operated sometimes in ambient light for applications like alpha counting and range finding. Detectors like Al/p-Si surface barrier with aluminium on the front side are found quite suitable. Gold/n-Si surface barrier detectors are not usable because of their excessive background photo current. These detectors, we fabricate for use in nuclear experiments, were given an aluminium coating on their gold side for use in room light. The Au/n-Si/Al surface barrier diodes were characterized for their electrical properties and performance as alpha detectors. Detectors showing good energy resolution (∼ 50 KeV) were selected and provided with another thin reflecting coat of aluminium on their front sides

  19. Electrowinning Al from Al2S3 in Molten Salt

    Xiao, Y; Van der Plas, D.W.; Bohte, J.; Lans, S.C.; Van Sandwijk, A.; Reuter, M.A.

    2007-01-01

    In order to investigate an alternative process for the production of primary aluminum via a sulfide intermediate, the electrochemical behavior of Al2S3 in molten salt has been studied on a laboratory scale. The effects of electrolyte composition, temperature, and cell design on the cell performance have been investigated. Temperature and cryolite addition have positive effects on the current density. Increasing the anode-to-cathode surface area (closer to unity) and shortening the interelectr...

  20. Thermal conductance of a pressed Al-Al contact

    Wanner, M.

    1981-01-01

    Thermal conductance of a screw-fastened joint between two blocks of Al-alloys has been measured. An AlMg4.5Mn-block, the end of which is cooled by liquid helium, constitutes the upper part of the sample and the contact is formed at the face surface of a cylindrical extension of that block onto which a cylinder, made of AlMgSi1, is pressed by means of a copper-nickel screw. Pressing of the contact was carried out at room temperature by applying a defined torque, M, to the fastening screw. Three samples of the same shape but with differently treated surfaces of contact (machined flat, electro-chemically polished, with gold plated contacts) were studied. The results showed that the machined flat surfaces yield the best contact and that the contact conductance (measured in the range 4.2 K to 1.8 K) of all samples increased with increasing torque. In addition to thermal measurements, a study of the electrical conductance would be very interesting to determine the different contributions of phonon and electron heat conduction by means of the Wiedemann-Franz law. The work is useful for the GIRL (German Infra-Red Laboratory) space experiment.

  1. Type idéal

    Paugam, Serge

    2014-01-01

    L’usage de types idéaux constitue pour Max Weber une démarche sociologique fondamentale. Le type idéal est pour lui un moyen de comprendre le sens que les individus donnent à leurs expériences vécues, ce qui conduit à mettre ces dernières en relation avec l’organisation de la société à un moment historique de son évolution. Définir un type idéal ne signifie pas repérer sa forme majoritaire d’un point de vue statistique, mais discerner à partir des formes historiques des sociétés contemporaine...

  2. Al-Hadith Text Classifier

    Mohammed Naji Al-Kabi

    2005-01-01

    Full Text Available This study explore the implementation of a text classification method to classify the prophet Mohammed (PBUH hadiths (sayings using Sahih Al-Bukhari classification. The sayings explain the Holy Qur`an, which considered by Muslims to be the direct word of Allah. Present method adopts TF/IDF (Term Frequency-Inverse Document Frequency which is used usually for text search. TF/IDF was used for term weighting, in which document weights for the selected terms are computed, to classify non-vocalized sayings, after their terms (keywords have been transformed to the corresponding canonical form (i.e., roots, to one of eight Books (classes, according to Al-Bukhari classification. A term would have a higher weight if it were a good descriptor for a particular book, i.e., it appears frequently in the book but is infrequent in the entire corpus.

  3. The effect of Si in Al-alloy on electromigration performance in Al filled vias

    Kageyama, Makiko; Hashimoto, Keiichi; Onoda, Hiroshi

    1998-01-01

    Electromigration performance of vias filled with Al-Si-Cu alloys on Ti glue layers was investigated in comparison with W-stud vias. In Al-Si-Cu filled vias, voids were formed at only a few locations in the test structure, while voids were formed at every via in W-stud via chains. It is supposed that Al moves through the Al-Si-Cu via during electromigration in spite of the existence of a glue layer at the via bottom. This phenomenon was observed only in the vias filled with Al-Si-Cu alloy. Al movement was prohibited in Al-Cu filled vias. In Al-Si-Cu filled vias, an Al-Ti-Si alloy was formed at the via bottom while Al3Ti was formed at Al-Cu filled vias. Al is speculated to move through this Al-Ti-Si alloy during electromigration.

  4. Lernhabitus als Grundlage lebenslanger Lernprozesse

    Herzberg, Heidrun

    2005-01-01

    'In diesem Artikel wird die These vertreten, dass das Habitus-Konzept von Bourdieu, wenn es bei der Analyse von lebenslangen (biographischen) Lern- und Bildungsprozessen angewandt wird, einer biographietheoretischen Reformulierung bedarf. Vor diesem Hintergrund wird das eigene Konzept des biographischen Lernhabitus vorgestellt. Als Ergebnis einer Zwei-Generationen-Studie im Rostocker Werftarbeitermilieu können zwei deutlich voneinander zu entscheidende Lernhabitusmuster präsentiert werden. In...

  5. Utilitarismus als Methode der Ethik

    Daniels, Malte Cornelius

    2011-01-01

    In diesem Buch schlage ich eine radikal neuartige Sicht auf den Utilitarismus vor. Meine Hauptthese ist, dass der Utilitarismus selbst keine vollständige normative Theorie ist, aus der sich per se Handlungsbewertungen ableiten ließen, sondern normativ untersättigt und neutral ist. Sein normativer Gehalt ist vollständig abhängig von angenommenen Nutzenfunktionen. Jede konsistente Menge von moralischen Regeln (Moralsystem) kann, wie ich im Anhang beweise, als ein Spezialfall des Utilitarismus i...

  6. Vormundschaftsrecht als Grundlage politischer Herrschaft

    Arne Duncker

    2006-07-01

    Full Text Available In ihrer beachtlichen und sehr gewissenhaft dokumentierten Arbeit über vormundschaftliche Regentschaften im 16. und 17. Jahrhundert beschreibt Pauline Puppel unter ausführlichem Bezug auf zeitgenössische Literatur und Archivalien sowohl die allgemeine Rechtslage im damaligen Reich als auch die Anwendungsfälle in Hessen, wo zwischen 1500 und 1700 insgesamt viermal eine Landgräfin als Vormünderin des Fürsten zur Regentin ihres Landes wurde. Dies steht exemplarisch für eine bereits in der Frühen Neuzeit mögliche und nicht einmal ganz seltene Form politischer Frauenherrschaft, die bisher oft nicht hinreichend gewürdigt wurde. Puppels Untersuchung ist in zwei Hauptteile gegliedert. Der erste Teil (Das juristische Regelwerk“, S. 34-143 behandelt die zeitgenössischen Rahmenbedingungen der durch Frauen ausgeübten Vormundschaft und Regentschaft. Der zweite Abschnitt („Die Landgräfinnen von Hessen als Regentinnen“, S. 144-307 befasst sich mit der Ausfüllung dieser Regeln durch konkrete Fallbeispiele in Gestalt von Leben und Regentschaft der regierenden Landgräfinnen von Hessen.

  7. Microstructure of interaction interface between Al-Si, Zn-Al alloys and Al2O3p/6061Al composite

    许志武; 闫久春; 吕世雄; 杨士勤

    2004-01-01

    Interaction behaviors between Al-Si, Zn-AI alloys and Al2O3p/6061AI composite at different heating temperatures were investigated. It is found that Al2O3p/6061Al composite can be wetted well by AlSi-1, AlSi-4 and Zn-Al alloys and an interaction layer forms between the alloy and composite during interaction. Little Al-Si alloys remain on the surface when they fully wet the composite and Si element in Al-Si alloy diffuses into composite entirely and assembles in the composite near the interface of Al-Si alloy/composite to form a Si-rich zone. The microstructure in interaction layer with Si penetration is still dense. Much more residual Zn-Al alloy exists on the surface of composite when it wets the composite, and porosities appear at the interface of Zn-Al alloy/composite. The penetration of elements Zn, Cu of Zn-Al alloy into composite leads to the generation of shrinkage cavities in the interaction layer and makes the microstructure of Al2 O3p/6061A1 composite loose.

  8. The Structure and Main Issues of “al-Tasdid” of Husam al-Din al-Syghnaqi

    Daniyar B. Shalkarov

    2015-07-01

    Full Text Available The study of the theological maturidia in the Central Asia was developed by the majority of outstanding scientists in the Turkic area and was known from generation to generation with manuscripts. One of these famous scientists was Abu al-Mu‘in al-Nasafi. In Central Asia, in the branch of the Islamic kalam theology there were the works “Tabsira al-Adilla”, “Bahr al-Kalam”, “al-Tamheed li qawa‘id al-Tawheed”, which considered the issues of maturidia theological study. In the XIV century the great scientist from Syghanaq Husam al-din al-Syghnaqi made a detailed research of the work “al-Tamheed li qawa‘id al-Tawheed” of Abu al-Mu‘in al-Nasafi and wrote the work “al-Tasdeed fi sharh al-Tamheed” by giving a full explanation of all questions relating to the issue. This article considers the content and the kept versions in the World libraries and the importance of this work for today. There is a different information about the original version of the manuscript. The first, the manuscript is by Amca Zade Huseyn 309 number, written by Husam al-din al-Syghnaqi personally and kept in the turkic library. This information is written in the work “Syghanaq Sanlagi/ The star of the Syghanaq” of Shamshaddin Kerim, the second manuscript is kept in the Egypt Arabic Republic, in the library “Dar al-Kutub Misrya”. It is written in this manuscript, that the manuscript was published in 1125 according hizhra calendar. Therefore the article gives an explanation of the main maturidia kalam principles, which cover five chapters of the work. 

  9. Armaflex in Burj al Arab; Armaflex im Burj al Arab

    Steiner, B.

    2003-07-01

    This article describes the Burj al Arab in Dubai, the unique seven-star high-rise hotel. The construction of the hotel, that is built on 250 piles driven into the sand of an artificial island in the Persian Gulf, is described. In particular, various special materials used in the building are described, as are the luxurious fittings and furnishings of the hotel. The cooling and air-conditioning installations that are necessary as a result of the desert climate of Dubai are described and the use of 'Armaflex' elastomer insulating material for the insulation of refrigeration machines and cold-water piping is discussed.

  10. De los derechos humanos al derecho al aborto

    Zúñiga Fajuri, Alejandra

    2013-01-01

    Ninguna otra persona, en ninguna situación, es obligada a realizar el acto supererogatorio que se exige a la mujer embarazada. Aun cuando una adecuada aplicación de la teoría general de los derechos humanos permite reconocer el derecho al aborto durante los dos primeros trimestres del embarazo sobre la base de que los derechos sólo pueden restringirse por mor de los propios derechos. En esa línea, se intenta responder a quienes sostienen que el problema del aborto no puede resolverse pues no ...

  11. Friction Stir Welding of Al 5052 with Al 6061 Alloys

    Kumbhar, N. T.; Bhanumurthy, K.

    2012-01-01

    Friction stir welding (FSW), a solid-state joining technique, is being extensively used in similar as well as dissimilar joining of Al, Mg, Cu, Ti, and their alloys. In the present study, friction stir welding of two aluminium alloys—AA6061 and AA5052—was carried out at various combinations of tool rotation speeds and tool traverse speeds. The transverse cross-section of the weld was used for optical as well as electron microscopy observations. The microstructural studies were used to get an ...

  12. Memahami Tasawuf Ibnuu Arabi dan Ibnuu al Farid: Konsep al Hubb Illahi, Wahdat al Wujud, Wahdah al Syuhud dan Wahdat al Adyan

    Muhammad Robith Fuadi

    2013-12-01

    Full Text Available Kaum sufi menapaki jalan yang berbeda untuk menuju hakikat, mereka tidak menggunakan akal dan rasio untuk sampai pada hakikat. Akan tetapi, akal bukan satu-satunya jalan untuk menuju hakikat. Karena kita sering melihat sesuatu yang di luar jangkauan akal dalam hidup ini. Jalan yang ditempuh kaum sufi untuk menuju hakikat seperti kasyf, dzauq, 'iyan, musyahadah dan sebagainya dinilai sebagai sesuatu yang samar, tidak mempunyai batasan dan kaidah pasti, bahkan sering kali bercampur dengan igauan, mimpi, khayalan dan angan-angan. Tapi yang perlu kita ingat adalah bahwa media-media tersebut telah mampu menuntun manusia untuk memecahkan sesuatu yang tidak bisa dipecahkan oleh akal dan hukum-hukum fisika. Tulisan ini akan mengkaji gagasan-gagasan dua tokoh tasawuf besar yaitu Ibnu Arabi dan Ibnu al-Farid yang hidup  pada abad keenam dan ketujuh Hijriah. Tulisan ini secara spesifik akan mengkaji tiga gagasan penting ke dua tokoh tersebut. Yaitu al hubb al Ilahi, wahdat al Wujud dan wahdat al adyan.

  13. The Eminent Turkish Logician al-Abhari and "al-Risalah fî al-Kavâid al-Mantıqiyyah"

    el-EBHERÎ, Esîrüddîn Mufaddal b. Ömer es-Semerkandî

    2014-01-01

    Athar al-Din al-Abhari is an important figure whose works had been textbooks in the Ottoman schools for centuries al-Abhari who wrote so many books in such areas as philosophy, mathematics, astronomy and logic is especially known for his books Hidayat al-Hikmat and İsaghuji He took logic into account in all of his works of philosophy. He also wrote some books and treatises specially concerning logical problems. Here, we are going to present the Turkish translation of his al-Risâlah fi al-Kava...

  14. United modification of Al-24Si alloy by Al-P and Al-Ti-C master alloys

    韩延峰; 刘相法; 王海梅; 王振卿; 边秀房; 张均艳

    2003-01-01

    The modification effect of a new type of Al-P master alloy on Al-24Si alloys was investigated. It is foundthat excellent modification effect can be obtained by the addition of this new type of A1-P master alloy into Al-24Simelt and the average primary Si grain size is decreased below 47 μm from original 225 μm. It is also found that theTiC particles in the melt coming from Al8Ti2C can improve the modification effect of the Al-P master alloy. Whenthe content of TiC particles in the Al-24Si melt is 0.03 %, the improvement reaches the maximum and keeps steadywith increasing content of TiC particles. Modification effect occurs at 50 min after the addition of the Al-P master al-loy and TiC particles, and keeps stable with prolonging holding time.

  15. The Al-Al3Ni Eutectic Reaction: Crystallography and Mechanism of Formation

    Fan, Yangyang; Makhlouf, Makhlouf M.

    2015-09-01

    The characteristics of the Al-Al3Ni eutectic structure are examined with emphasis on its morphology and crystallography. Based on these examinations, the mechanism of formation of this technologically important eutectic is postulated. It is found that a thin shell of α-Al forms coherently around each Al3Ni fiber. The excellent thermal stability of the Al-Al3Ni eutectic may be attributed to the presence of this coherent layer.

  16. Reply to Pachai et al.

    Harrison, William J; Bex, Peter J

    2016-05-01

    Peripheral vision is fundamentally limited by the spacing between objects. When asked to report a target's identity, observers make erroneous reports that sometimes match the identity of a nearby distractor and sometimes match a combination of target and distractor features. The classification of these errors has previously been used to support competing 'substitution' [1] or 'averaging' [2] models of the phenomenon known as 'visual crowding'. We recently proposed a single model in which both classes of error occur because observers make their reports by sampling from a biologically-plausible population of weighted responses within a region of space around the target [3]. It is critical to note that there is no probabilistic substitution or averaging process in our model; instead, we argue that neither substitution nor averaging occur, but that these are misclassifications of the distribution of reports that emerge when a population response distribution is sampled. This is a fundamentally different way of thinking about crowding, and on this basis we claim to have provided a mechanism unifying categorically distinct perceptual errors. Our goal was not to model all crowding phenomena, such as the release from crowding when target and flanks differ in color or depth [4]. Pachai et al.[5] have suggested that our model is not unifying because it inaccurately predicts perceptual performance for a particular stimulus. Although we agree that our model does not predict their data, this specific demonstration overlooks the critical aspect of the model: perceptual reports are drawn from a weighted population code. We show that Pachai et al.'s [5] own data actually provide evidence for the population code we have described [3], and we suggest a biologically-plausible analysis of their stimuli that provides a computational basis for their 'grouping' account of crowding. PMID:27166690

  17. Al-Hadith Text Classifier

    Mohammed Naji Al-Kabi; Ghassan Kanaan; Riyad Al-Shalabi; Saja I. Al- Sinjilawi; Ronza S. Al- Mustafa

    2005-01-01

    This study explore the implementation of a text classification method to classify the prophet Mohammed (PBUH) hadiths (sayings) using Sahih Al-Bukhari classification. The sayings explain the Holy Qur`an, which considered by Muslims to be the direct word of Allah. Present method adopts TF/IDF (Term Frequency-Inverse Document Frequency) which is used usually for text search. TF/IDF was used for term weighting, in which document weights for the selected terms are computed, to classify non-vocali...

  18. The ALS Gun Electronics system

    The ALS Gun Electronics system has been designed to accommodate gun with a custom made socket and high speed electronics circuit which is capable of producing single and multiple electron bunches with time jitters measured at better than 50 PS. The system generates the gated RF signal at ground level before sending it up to the 120 KV-biased gun deck via a fiber optic cable. The current pulse width as a function of grid bias, using an Eimac 8847A planar triode simulating an electron gun, was measured to show the relationship between the two parameters

  19. The ALS project: lessons learned

    Monckton, Simon; Collier, Jack; Giesbrecht, Jared; Broten, Greg; MacKay, David; Erickson, David; Verret, Sean; Digney, Bruce

    2006-05-01

    In support of Canadian Forces transformation, Defence R&D Canada (DRDC) has established an ongoing program to develop machine intelligence for semi-autonomous vehicles and systems. Focussing on mine clearance and remote scouting for over a decade, DRDC Suffield has developed numerous UGVs controlled remotely over point-to-point radio links. Though this strategy removes personnel from potential danger, DRDC recognized that human factors and communications bandwidth limit teleoperation and that only networked, autonomous unmanned systems can conserve these valuable resources. This paper describes the outcome of the first autonomy project, Autonomous Land Systems (ALS), designed to demonstrate basic autonomous multivehicle land capabilities.

  20. Grainreifnementlimit of commercialpureAl inoculatedbyAl-Ti-C(B)masteralloys

    En-zhao Wang; Xiang-fa Liu

    2015-01-01

    The grain reifnement limits of commercial pure Al inoculated by Al-5Ti-1B, Al-5Ti-0.25C and Al-5Ti-0.3C-0.2B master al oys were studied, and the inlfuence of melting temperature on the grain reifning performance of these three master al oys was investigated using a high scope video microscope (HSVM), a ifeld-emission scanning electron microscope (FESEM), an electron probe micro-analyzer (EPMA) and X–ray diffraction (XRD) method. Results show that there is a grain reifnement limit of commercial pure Al reifned by these three master al oys; with the same addition level of 1.5% under the present experimental conditions, the grain reifnement limits (smal est average grain size) of commercial pure Al reifned by Al-5Ti-1B, Al-5Ti-0.25C and Al-5Ti-0.3C-0.2B master al oys are 50 µm, 80 µm and 80 µm, respectively. In addition, with an increase in the melting temperature of the pure Al, the grain reifning performance of Al-5Ti-1B and Al-5Ti-0.25C master al oys decreases, but the grain reifning performance of Al-5Ti-0.3C-0.2B changes little.

  1. Analisis Salasilah Tarekat Shaykh Shams al-Din al-Sumatra’i

    ROHAIMI RASTAM; MOHD SYUKRI YEOH ABDULLAH; YUSRI MOHAMAD RAMLI

    2015-01-01

    This article examines the spiritual chain (silsilah tariqah) of Shaykh Shams al-Din al-Sumatra’i (alt. al-Sumatrani), Qadi al-Malik al-‘Adil (Prime Minister and Mufti) of Aceh during the reign of Sultan Iskandar Muda in 1607 to 1627. The study is primarily based on his manuscript of Mir’at al-Muhaqqiqin as well as Shaykh Abdul Haqq Muhaddith Dahlawi’s Zad al-Muttaqin. By mapping the lineage of all data available, this study features al-Sumatra’is spiritual chain that consist of Qadiriyyah, Sh...

  2. Formaline of alternatieven als ontsmettingsmiddel voor broedeieren

    Meijerhof, R.; Dijk, D. van

    1997-01-01

    Formaline wordt algemeen gezien als een goed middel om broedeieren te ontsmetten. Toch geeft ontsmetting met middelen als ozon en waterstofperoxyde vaak een iets beter broedresultaat. Een eventuele verklaring hiervoor is momenteel nog niet te geven.

  3. Benefits for Military Veterans with ALS

    ... Chapters Certified Centers and Clinics Support Groups About ALS About Us Our Research In Your Community Advocate ... Veterans Resources for Military Veterans, Families & Survivors The ALS Association is working everyday to support people with ...

  4. AlON-SiAlON复合材料的制备及特性%Preparation and properties of AlON-SiAlON composites

    山下敬; 山口明良

    2003-01-01

    为提高AlON陶瓷材料的抗氧化性能,制备了AlON-SiAl7O2N7复相材料.在1750℃、0.5 MPa的N2气氛中,保温2 h烧成不同Al2O3/AlN/Si3N4配比的原料得到不同AlON/SiAl7O2N7比的复相材料.因为在烧结SiAl7O2N7的过程中,蒸发-凝聚的同时伴随着SiO气体的挥发,因此很难得到致密的AlON-SiAl7O2N7复相材料.研究了AlON-SiAl7O2N7复相材料在1300℃、空气中的抗氧化性能,同时作为比较,研究了相同条件下单相的AlON材料的抗氧化性能.结果表明,AlON-SiAl7O2N7复相材料显示了较之单相的AlON陶瓷材料更好的抗氧化性能,这是因为氧化过程中所形成的含玻璃相的表面氧化层抑制了氧的向内扩散所致.

  5. Betaalde arbeid als verdringer van vrijwilligerswerk? Overbelasting als mogelijke verklaring

    Angela Kok-Van Meer

    2014-06-01

    Full Text Available Do paid work activities displace volunteering? A potential explanation from role overload theoryRecent changes in Dutch society might lead to a shortage of volunteers. On the one hand, the demand for volunteers is increasing: in the social welfare domain because of governmental austerity policies and in other domains such as sports because of the higher supervision intensity of activities. On the other hand, the supply of volunteers is likely to decrease as more and more women and older workers are active in the labor market, which reduces the time that is available for volunteering. Role overload theory would suggest that the increasing labor participation rate of certain categories of workers goes along with a decline of participation in voluntary work. The secondary data analysis shows that various role loads (work, care for children living at home are associated with differences in participation in voluntary work. However, while a higher number of contractual work hours and hours spent on work-related training are negatively associated with volunteer work, care for children living at home is positively associated with volunteering. These results provide only limited support for role overload theory.Betaalde arbeid als verdringer van vrijwilligerswerk? Overbelasting als mogelijke verklaringDe afgelopen jaren hebben zich enkele maatschappelijke veranderingen voorgedaan, die wellicht tot schaarste op de Nederlandse vrijwilligersmarkt zouden kunnen leiden. Enerzijds neemt de vraag naar vrijwilligers toe doordat subsidieregelingen versoberen (bijvoorbeeld in zorg en welzijn en de begeleidingsintensiteit in bepaalde organisaties stijgt (bijvoorbeeld in sport. Anderzijds neemt het aanbod van vrijwilligers af doordat vrouwen en ouderen meer en langer op de arbeidsmarkt actief zijn, waardoor minder tijd beschikbaar is voor vrijwilligerswerk. In dit artikel wordt aan de hand van de role overload theorie nagegaan of het al dan niet deelnemen aan

  6. Thermoluminescence properties of AlN ceramics

    Trinkler, L.; Christensen, P.; Agersnap Larsen, N.; Berzina, B.

    The paper describes thermoluminescence (TL) properties of AlN:Y2O3 ceramics irradiated with ionising radiation. A high TL sensitivity of AlN:Y2O3 ceramics to radiation encouraged a study of the AlN ceramics for application as a dosimetric material. The paper presents experimental data on: glow...

  7. Electroplating Zn-Al Alloy Technology

    2002-01-01

    The method of controlling separating anode and separating power source was used to perform orthogonal optimization for the parameters in electroplating Zn-Al alloy.The electroplating Zn-Al alloy technology was decided, in which the content of Al is about 12%-15%.

  8. The fabrication of 26Al targets

    Targets with up to 1.4x101626Al atoms have been fabricated. The artificial production of the 26Al nuclei via the reaction 26Mg(p, n)26Al was carried out at the cyclotrons in Juelich and Muenchen. The experimental procedures in the fabrication of these targets as well as some test measurements are described. (orig.)

  9. Nonstoichiometry of Al-Zr intermetallic phases

    Radmilovic, V.; Thomas, G.

    1994-06-01

    Nonstoichiometry of metastable cubic {beta}{prime} and equilibrium tetragonal {beta} Al-Zr intermetallic phases of the nominal composition Al{sub 3}Zr in Al-rich alloys has been extensively studied. It is proposed that the ``dark contrast`` of {beta}{prime} core in {beta}{prime}/{sigma}{prime} complex precipitates, in Al-Li-Zr based alloys, is caused by incorporation of Al and Li atoms into the {beta}{prime} phase on Zr sublattice sites, forming nonstoichiometric Al-Zr intermetallic phases, rather than by Li partitioning only. {beta}{prime} particles contain very small amounts of Zr, approximately 5 at.%, much less than the stoichiometric 25 at.% in the Al{sub 3}Zr metastable phase. These particles are, according to simulation of high resolution images, of the Al{sub 3}(Al{sub 0.4}Li{sub 0.4}Zr{sub 0.2}) type. Nonstoichiometric particles of average composition Al{sub 4}Zr and Al{sub 6}Zr are observed also in the binary Al-Zr alloy, even after annealing for several hours at 600{degree}C.

  10. Topiramat als Phasenprophylaktikum - ein Fallbericht

    Letmaier M

    2001-01-01

    Full Text Available Topiramat ist ein neues Antiepileptikum mit einem breiten Wirkspektrum. Aktuelle klinische Studien geben Hinweise darauf, daß Topiramat stimmungsstabilisierende Eigenschaften besitzt und somit effizient in der Behandlung der bipolaren affektiven Störung sein könnte. Vor dem Hintergrund dieser Studienberichte, behandelten wir eine 41jährige, erstmals vor 10 Jahren erkrankte Patientin mit der Diagnose einer therapierefraktären, bipolaren affektiven Störung (Rapid-Cycling mit Topiramat. Im Rahmen ihrer Erkrankung wurde die Patientin insgesamt 12mal stationär aufgenommen und meist aufgrund von akuten manischen Episoden behandelt. Dabei kamen seit 1991 folgende Phasenprophylaktika zur Anwendung: Carbamazepin, Valproat und Lamotrigin ? zuletzt nur mit mäßigem Erfolg. Daraufhin wurde zu Beginn einer neuerlichen manischen Episode ambulant eine Therapie mit Topiramat begonnen. Acht Wochen nach Therapiestart kam die Patientin in stationäre Behandlung. Der Aufenthalt dauerte weniger als drei Wochen; Topiramat wurde von der Patientin gut vertragen. Infolge eines belastenden Lebensereignisses kam es unter kontinuierlicher Therapie mit Topiramat zu einer Destabilisierung des psychischen Zustandsbildes (manische Symptome. Durch eine ambulante Erhöhung der Topiramatdosis bei gleichzeitiger Gabe von Risperidon und Clonazepam konnte jedoch eine neuerliche manische Episode erstmals ambulant behandelt werden. Die Patientin erhält derzeit 200 mg Topiramat pro Tag und ist seit mehr als 20 Monaten nahezu beschwerdefrei.

  11. Capitulo I. Construcción y adaptaciones del sistema ritual otomi de la Conquista a nuestros dias

    Galinier, Jacques

    2014-01-01

    Enigmática y secreta, la religión prehispánica de los otomíes permanece aún en nuestros días nimbada de misterios. Sin embargo, es indisociable de los sistemas de pensamiento de las sociedades que formaron parte de Mesoamérica, antes de la llegada de los españoles. En sus grandes ejes, esta religión presenta profundas similitudes con la de los mexicas, que conocemos gracias a un corpus impresionante de glosas, de exégesis indígenas, de documentos iconográficos y arquitectónicos de todo tipo. ...

  12. Systems Engineering Techniques for ALS Decision Making

    Rodriquez, Luis F.; Drysdale, Alan E.; Jones, Harry; Levri, Julie A.

    2004-01-01

    The Advanced Life Support (ALS) Metric is the predominant tool for predicting the cost of ALS systems. Metric goals for the ALS Program are daunting, requiring a threefold increase in the ALS Metric by 2010. Confounding the problem, the rate new ALS technologies reach the maturity required for consideration in the ALS Metric and the rate at which new configurations are developed is slow, limiting the search space and potentially giving the perspective of a ALS technology, the ALS Metric may remain elusive. This paper is a sequel to a paper published in the proceedings of the 2003 ICES conference entitled, "Managing to the metric: an approach to optimizing life support costs." The conclusions of that paper state that the largest contributors to the ALS Metric should be targeted by ALS researchers and management for maximum metric reductions. Certainly, these areas potentially offer large potential benefits to future ALS missions; however, the ALS Metric is not the only decision-making tool available to the community. To facilitate decision-making within the ALS community a combination of metrics should be utilized, such as the Equivalent System Mass (ESM)-based ALS metric, but also those available through techniques such as life cycle costing and faithful consideration of the sensitivity of the assumed models and data. Often a lack of data is cited as the reason why these techniques are not considered for utilization. An existing database development effort within the ALS community, known as OPIS, may provide the opportunity to collect the necessary information to enable the proposed systems analyses. A review of these additional analysis techniques is provided, focusing on the data necessary to enable these. The discussion is concluded by proposing how the data may be utilized by analysts in the future.

  13. Relación entre salud y renuncia al empleo en trabajadoras de la industria maquiladora electrónica de Tijuana The relationship between health and quitting work among electronic industry female workers in Tijuana

    Sylvia Guendelman

    1999-07-01

    Full Text Available OBJETIVO. Analizar factores de salud, laborales y sociales que contribuyen a renunciar al trabajo en dos maquiladoras transnacionales del ramo electrónico de Tijuana. MATERIAL Y MÉTODOS. Se realizó un estudio de cohorte a 725 mujeres empleadas en una planta japonesa y una estadunidense, entre enero de 1992 y marzo de 1994. La muestra se estratificó en dos intervalos de tiempo ­30 y >30 días laborados. Se efectuó un seguimiento de las mujeres hasta su renuncia o final del periodo de observación, mediante la recolección de información sobre variables de salud, sociales y ocupacionales de diversas fuentes de registro obtenidas de su centro de trabajo. Los motivos de renuncia y la confiabilidad de los datos obtenidos de los registros se estudiaron por medio de entrevistas de seguimiento realizadas a 46% (n= 148 de las trabajadoras que renunciaron y fueron localizadas aproximadamente 12 meses (desviación estándar= 6.7 después de su renuncia. RESULTADOS. La probabilidad acumulativa de renunciar al trabajo fue de 67% en el primer año y de 81% en el segundo. La ausencia de antecedentes laborales previos, turno diurno y nacionalidad de la compañía, resultaron factores predictivos para la renuncia al empleo durante los primeros 30 días. Tabaquismo, antecedentes quirúrgicos y haberse incapacitado por enfermedad general, después de controlar por otras variables, actuaron como factores predictivos para la renuncia posterior a 30 días. En contraposición, la tasa de renuncia posterior a 30 días resultó menor para mujeres con enfermedades crónicas. CONCLUSIONES. La renuncia al empleo en las maquiladoras es elevada y selectiva; en tanto que los factores ocupacionales se asociaron con la renuncia temprana, los relacionados con la salud fueron mejores factores predictivos para la renuncia posterior a los primeros 30 días.OBJECTIVE. To examine the health, labor and social factors which contribute to quitting work in two transnational

  14. Polythermal cutting of Al-Si-YAl2 system

    Given the out come of the research of the Al-Si-YAl2 system with studies of polythermal cutting. It was found out that the most cutting of Al-YSi2Al2, Al-YSiAl2, Al-Y5SiAl14, YSiAl2-YSi2Al2, Y5SiAl14-YSiAl2 and Y5SiAl14-YAl2, Si-YSiAl2 has the nature of quasibinary eutectics

  15. Progresses in analyzing 26Al with SMCAMS

    Shanghai Mini-Cyclotron based Accelerator Mass Spectrometer (SMCAMS) was especially designed for analyzing 14C. In order to accelerate and analyze 26Al the accelerated orbit and beam optics in injection system were calculated and harmonic number and acceleration turns was optimized. Preliminary experiment was carried out. In which a beam current of 1.15 x 10-9A for 27Al- and 0.038 CPS background for 26Al were measured. The limited sensitivity of 26Al/27Al is 5.25 x 10-12. (authors)

  16. AlON粉体的合成

    赵小军; 茹红强; 张宁; 孙有政

    2009-01-01

    以α-Al2O3和AlN为原料,利用高温固相反应在氮气气氛下常压合成了AlON粉体。研究了成分配比、合成温度、保温时间对合成AlON粉体含量的影响,并通过热分析测试了合成过程热流和质量的变化。结果表明,当原料Al2O3和AlN的质量比为81:18、合成工艺为1750℃,2h时,得到AlON相的含量达到95%以上。

  17. Trato verbal paterno al adolescente

    Rodríguez Juan Carlos

    1995-06-01

    Full Text Available

    En alguna ocasión se ha escuchado una palabra, que causa un sentimiento y a la vez un recuerdo, que lleva a evocar la adolescencia o la infancia, se recuerda quien la pronunciaba y en que ocasión la decía. Este es el poder que tiene una palabra y más aún si es dicha por el padre, puesto que este es la figura significativa que se lleva en la memoria. De aquí nace el interés de realizar un estudio, en donde se describe y analice la percepción y el sentimiento del adolescente, quien en esta etapa es vulnerable al cambio, ya que está buscando su propia identidad; que con el trato verbal paterno la encontrara sin ninguna dificultad o por el contrario nunca la encontrará.

     

  18. Orientation of Al3Ti platelets in Al-Al3Ti functionally graded material manufactured by centrifugal method

    Al-Al3Ti functionally graded materials (FGMs) were manufactured by the centrifugal method with a commercial ingot of Al-5 mass% Ti master alloy. The alloy was melted at a liquid/solid coexisting temperature, at which Al3Ti remains as a solid, and then it was cast into a thick-walled ring. It was found that the Al-Al3Ti functionally graded material can be successfully fabricated by the centrifugal method. It was also found that the volume fraction of the Al3Ti can be increased by repetition of the centrifugal method. Since the shape of Al3Ti particles in a commercial alloy ingot is that of a platelet, the Al3Ti particles are arranged with their platelet planes nearly perpendicular to the radial direction. The orientation effects become stronger when the G number becomes larger. Although the final centrifugal casting was conducted under a very large centrifugal force for the specimen cast three times, the orientation effects were weaker than those in the specimen cast one time. From these observations, it is concluded that the origin of orientation of Al3Ti platelets can be attributed to the angular velocity gradient of the melt along the radial direction produced by the difference in the viscosity. (orig.)

  19. TEM characterization of Al-C-Cu-Al2O3 composites produced by mechanical milling

    Novel Al-based composites (Al-C-Cu-Al2O3) obtained by mechanical milling (MM), were characterized by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS). Analyses of composites were carried out in both, the as-milled and the as-sintered conditions. C nanoparticles were found in the as-milled condition and Al2O3 nanofibers were found in as-sintered products, as determined by EELS. C and Cu react with Al to crystallize in Al3C4 and Al2Cu structures, respectively

  20. MARTENSITIC TRANSFORMATION AND THERMAL STABILITY IN Cu-Al-Co AND Cu-Al-Zr ALLOYS

    Y. Q. Ma; C.B. Jiang; H.B. Xu

    2003-01-01

    Cu-Al-Co and Cu-Al-Zr alloys were explored with Co or Zr additions in Cu-Al alloys for high temperature shape memory alloys. Samples were quenched after homogenized at 850℃ for 48h. It was found that both Cu-Al-Co and Cu-Al-Zr show AlCu3 martensitic phase at room temperature and exhibit martensitic transformation temperatures higher than 200℃, showing the potentials for developing as high temperature shape memory alloys. Thermal cycles were performed by DSC instrument on both Cu-Al-Co and Cu-Al-Zr alloys. The results show that Cu-Al-Co loses its martensitic transformation after five thermal cycles, and Cu-Al-Zr exhibits no martensitic transformation in the second thermal cycle.

  1. Influences of Al particles on the microstructure and property of electrodeposited Ni-Al composite coatings

    Cai, Fei; Jiang, Chuanhai

    2014-02-01

    Ni-Al composite coatings with different contents of Al microparticles were prepared from a conventional Watt bath. The influences of Al particle loadings in the bath on the surface morphology, composition, texture, grain size, microstrain, residual stress and anti-corrosion of the Ni-Al composite coating were investigated. The friction coefficients of the coatings at 200 °C were also evaluated by a pin-on-disctribometer. The results showed that the surface morphology of the coatings changed from pyramid + colonied structure to colonied structure with increasing Al particle loadings. The (2 0 0) preferred orientation for pure Ni coating evolved to random orientation with increasing Al particle loadings. The grain size obtained the minimum value of 72.28 nm at Al particle loading of 100 g/L and the microstrain of the coating increased with increasing the Al particle loadings. The incorporation of Al particles decreased the residual stress of the electro-deposited coating and all the coatings deposited at different Al particle loadings possessed low residual stress. As the Al particle loading increased, the anti-corrosion of the Ni-Al coatings increased owing to the combined effect of increasing Al content in the coatings and the texture evolution from (2 0 0) plane to (1 1 1) plane. The wear result suggested that the increasing Al particle content did not improve the wear performance of the Ni-Al composite coatings.

  2. Efficiency droop in high-Al-content AlGaN/AlGaN quantum wells

    Tamulaitis, G.; Mickevicius, J.; Kazlauskas, K.; Zukauskas, A. [Institute of Applied Research and Department of Semiconductor Physics, Vilnius University, Sauletekio 9-III, 10222 Vilnius (Lithuania); Shur, M.S. [Department of ECE and CIE, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY 12180 (United States); Yang, J.; Gaska, R. [Sensor Electronic Technology Inc., 1195 Atlas Road, Columbia, SC 29209 (United States)

    2011-07-15

    Excitation power density dependence of photoluminescence (PL) efficiency is studied in the temperature range from 8 to 300 K for AlGaN multiple quantum well structures containing quantum wells of different width. PL efficiency droop is observed and dependence of the droop effect on the well width and lattice temperature is discussed. Photoluminescence band shape reveals strong carrier heating. It is shown that the heating effect has a substantial influence on the photoluminescence efficiency droop, especially at low lattice temperatures. Fitting of the temperature dependence of the PL band width with that obtained by the Monte Carlo simulation of carrier (exciton) hopping via localized states shows that (i) the potential fluctuations can be fairly accurately described using a double-scaled potential profile model, (ii) the localization becomes stronger in narrower quantum wells. (copyright 2011 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  3. Al-Si/Al2O3 in situ composite prepared by displacement reaction of CuO/Al system

    Zhang Jing

    2010-02-01

    Full Text Available Al2O3 particle-reinforced ZL109 composite was prepared by in situ reaction between CuO and Al. The microstructure was observed by means of OM, SEM and TEM. The Al2O3 particles in sub-micron sizes distribute uniformly in the matrix, and the Cu displaced from the in situ reaction forms net-like alloy phases with other alloy elements. The hardness and the tensile strength of the composites at room temperature have a slight increase as compared to that of the matrix. However, the tensile strength at 350 ℃ has reached 90.23 MPa, or 16.92 MPa higher than that of the matrix. The mechanism of the reaction in the CuO/Al system was studied by using of differential scanning calorimetry(DSC and thermodynamic calculation. The reaction between CuO and Al involves two steps. First, CuO reacts with Al to form Cu2O and Al2O3 at the melting temperature of the matrix alloy, and second, Cu2O reacts with Al to form Cu and Al2O3 at a higher temperature. At ZL109 casting temperature of 750–780 ℃, the second step can also take place because of the effect of exothermic reaction of the first step.

  4. Fabrication of TiAl3 coating on TiAl-based alloy by Al electrodeposition from dimethylsulfone bath and subsequent annealing

    Miyake, Masao; Tajikara, Seiya; Hirato, Tetsuji

    2011-01-01

    TiAl3 coating was formed on TiAl alloy by Al electrodeposition from a dimethylsulfone (DMSO2) bath and subsequent annealing. Before the Al electrodeposition, anodic dissolution of TiAl substrate in the DMSO2 bath was conducted to remove the surface oxide layer of the TiAl substrate. By performing the Al electrodeposition immediately after the anodic dissolution, uniform Al films adherent to the TiAl substrate could be obtained. Annealing at 650–1000 °C yielded a single TiAl3 layer or two laye...

  5. Orientation relationship of eutectoid FeAl and FeAl2

    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

  6. Electron channelling enhanced microanalysis on Ni-Al-Mn and Al-Mn-Si

    Atom location by channelling enhanced microanalysis (ALCHEMI) was performed for Ni-Al-Mn compounds and Al-Mn-Si quasicrystals. For Ni75Al25-xMnx (x=5,9) with the L12-type structure, an occupation fraction of Mn atoms at the Ni site was quantitatively determined using planar channelling conditions. The occupation fraction increases with the Mn concentration or by quenching the compound from high temperature. In quasicrystals of Al74Mn20Si6 and Al68Mn20Ru8Si4, axial channelling conditions were used to locate Si and Ru, respectively. It was shown that Si atoms occupy the Al site in Al74Mn20Si6 whereas Ru atoms occupy the site different from that of Al in Al68Mn20Ru8Si4. (author)

  7. Microstructure and mechanical properties of Ti2AlC-reinforced TiAl composites

    Ti2AlC/TiAl composites were successfully in-situ synthesized by reaction hot pressing using Ti, Al, TiC and CNTs as starting materials. The results indicate that the as-sintered composites mainly consist of Ti2AlC and TiAl phases. The mechanical properties of the 23 wt.% Ti2AlC/TiAl composite exhibit the highest values, with a flexural strength and fracture toughness of 652.5 ± 76.8 MPa and 6.6 ± 0.5 MPa m1/2, respectively. The complex structure coupled with dispersed Ti2AlC micro-particulates is responsible for the enhancement in the strength. Toughening of the composite is mainly attributed to crack deflection, crack bridging, crack branching and pull-out of the Ti2AlC particles, as well as transgranular cracking.

  8. High pressure studies of UFe5Al7 and UFe7Al5 actinide compounds

    The ternary inter-metallic compounds, UFe5Al7 and UFe7Al5, crystallize in a tetragonal ThMn12 type structure. In the as-cast samples a residual phase of FeAl (∼2%wt) was identified in the grain boundaries. The amount of the residual cubic phase of FeAl was determined by Rietveld analysis and reduced by the annealing process. UFe5Al7 and UFe7Al5 maintain the tetragonal symmetry as a function of pressure, while FeAl keeps the cubic structure as was determined by the Rietveld analysis. The volume-pressure curve calculated from the X-ray analysis gives V/V0=0.87 for UFe5Al7 at 26.0 GPa and 0.89 at 24.6 GPa for UFe7Al5. (author)

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

    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.

  10. Fabrication of /sup 26/Al targets

    Buchmann, L.; Baumeister, H.; Rolfs, C.

    1984-06-01

    Targets with up to 1.4x10/sup 16/ /sup 26/Al atoms have been fabricated. The artificial production of the /sup 26/Al nuclei via the reaction /sup 26/Mg(p, n)/sup 26/Al was carried out at the cyclotrons in Juelich and Muenchen. The experimental procedures in the fabrication of these targets as well as some test measurements are described.

  11. The wobbler mouse, an ALS animal model

    Moser, Jakob Maximilian; Bigini, Paolo; Schmitt-John, Thomas

    2013-01-01

    This review article is focused on the research progress made utilizing the wobbler mouse as animal model for human motor neuron diseases, especially the amyotrophic lateral sclerosis (ALS). The wobbler mouse develops progressive degeneration of upper and lower motor neurons and shows striking similarities to ALS. The cellular effects of the wobbler mutation, cellular transport defects, neurofilament aggregation, neuronal hyperexcitability and neuroinflammation closely resemble human ALS. Now,...

  12. A New Phase in ALS Research.

    Chong, P Andrew; Forman-Kay, Julie D

    2016-09-01

    In this issue of Structure, Conicella et al. (2016) present evidence that the low complexity C-terminal region of TDP-43 undergoes liquid-liquid phase separation. ALS-associated mutations alter this phase separation process, providing a possible mechanism for the pathology caused by these TDP-43 mutations. The work is strongly supportive of toxic loss of RNA processing function in ALS. PMID:27602988

  13. Growth of CdTe: Al films

    CdTe: AI films were grown by the close space vapor transport technique combined with free evaporation (CSVT-FE). The Aluminum (Al) evaporation was made by two kinds of sources: one made of graphite and the other of tantalum. The films were deposited on glass substrates. The Al source temperature was varied maintaining the CdTe source temperature fixed as well as the substrate temperature. The films were characterized by x-ray energy dispersive analysis (EDAX), x-ray diffraction and optical transmission. The results showed for the films grown with the graphite source for Al evaporation, the Al did not incorporate in the CdTe matrix, at least to the level of EDAX sensitivity; they maintained the same crystal structure and band gap. For the samples grown with the tantalum source, we were able to incorporate the Al. The x-ray diffraction patterns show that the films have a crystal structure that depends on Al concentration. They were cubic up to 2.16 at. % Al concentration; for 19.65 at. % we found a mixed phase; for Al concentration higher than 21 at. % the films were amorphous. For samples with cubic structure it was found that the lattice parameter decreases and the band gap increases with Al concentration. (Author)

  14. Genetics of Familial and Sporadic ALS

    2016-03-21

    Amyotrophic Lateral Sclerosis (ALS); Familial Amyotrophic Lateral Sclerosis; Amyotrophic Lateral Sclerosis With Frontotemporal Dementia; Lou Gehrig's Disease; Motor Neuron Disease; Primary Lateral Sclerosis

  15. 关于w-al-CL空间%On w-al-CL Spaces

    林丽琼; 张云南

    2011-01-01

    给出w-al-CL空间的定义,比较几种CL性的关系,讨论w-al-CL空间的c0和与l1和的稳定性,并讨论C(K,X)空间的w-al-CL性.%Gives the definition of w-al-CL spaces, compare the relationship of some properties of CL, discusses the stability of c0 -sums and l1 -sums of w-al-CL spaces, and discusses the property of w-al-CL of C(K,X) spaces.

  16. Interfacial strength of Al/Al and Al/Zr/Du-10wt%Mo subject to different loading modes

    Compact tension (CT) experiments were conducted with fixtures that allowed mode-I (tensile opening mode), mode-Il (shearing mode), and mixed-mode loading to measure the interfacial strength between HIP-clad Al and Al, and Al and Zr/DU-10wt%Mo. Specimens were made with the same HIP process used for making thin composite foils, but instead used 25 mm thick Al-6061 cladding that allowed specimens to be gripped without adhesives. Three configurations of specimens were tested: (1) Al/Al specimens with a pre-crack along the seam; (2) specimens containing both a Zr/DU-10wt%Mo layer and an Al/Al seam along part of the interface; and (3) specimens containing only a Zr/DU-10wt%Mo layer at the interface, but with a pre notch along part of the interface. Digital image correlation (DIC) was used to measure full-field deformations during the test. The results show that mode-I loaded interfaces exhibit the weakest strength and the widest scatter. The strength increases when more shearing component is introduced

  17. Radicais livres de oxigênio e exercício: mecanismos de formação e adaptação ao treinamento físico Radicales libres de oxigeno y ejercicio: mecanismos de formación y adaptación al entrenamiento Oxygen free radicals and exercise: mechanisms of synthesis and adaptation to the physical training

    Cláudia Dornelles Schneider

    2004-08-01

    pelo treinamento físico.El interés a cerca de los mecanismos de generación y adaptación de radicales libres de oxígeno (RLO al ejercicio aumentó significativamente a partir de la demostración de su relación con el consumo de oxígeno. Los RLO son formados por la reducción incompleta de del oxígeno, generando especies que presentan una alta reactividad para otras biomoléculas, principalmente lípidos y proteínas de las membranas celulares y, así mismo, el DNA. Las injurias provocadas por el estrés oxidativo presentan efectos acumulativos y están relacionados a una serie de enfermedades, como el cáncer, la arteriosclerosis o la diabetes. El ejercicio físico agudo, en función del incremento del consumo de oxígeno promueve un aumento en la formación de los RLO. No en tanto, el entrenamiento físico es capaz de generar adaptaciones capaces de mitigar los efectos deletéreos provocados por los RLO. Estas adaptaciones están relacionadas a una serie de sistemas de los cuales los mas importantes son los sistemas enzimáticos, compuestos por la peróxido dismutasa, catalasa y glutation peroxidasa y los sistemas no enzimáticos compuestos por ceruloplasmina, hormonas sexuales, la coenzima Q, ácido úrico, proteínas de choque térmico, y otros. Tales adaptaciones, a pesar de las controversias sobre los mecanismos comprendidos, promueven una mayor resistencia tisular a los desafíos oxidativos, como son aquellos proporcionados por el ejercicio físico de alta intensidad y de larga duración. Las técnicas de evaluación del estrés oxidativo, la mayoría de las veces, no son capaces de detectar injurias en ejercicios de corta duración. De esta forma, los esfuerzos están siendo realizados por largos periodos de tiempo o realizados hasta la extenuación. Nuevos marcadores de lesión por acción de los RLO están siendo descubiertos y nuevas técnicas para su determinación están siendo creadas. El objetivo de este trabajo es discutir los mecanismos de

  18. Untersuchung der Nitridierung V/Al-intermetallischer Phasen

    Lewalter, Hartmut Berthold

    2004-01-01

    Schichten V/Al-Intermetallischer Phasen und Schichten aus V(Al) (Schichtdicken 150- 300 nm) wurden durch Interdiffusion von V/Al- und V5Al8/V-Mehrfachschichten bei 400-800°C im Vakuum bei 3 x 10-8 mbar hergestellt. Des Weiteren wurden V5Al8-Schichten durch Sputtern einer V5Al8-Legierung erzeugt. Die Gesamtstöchiometrie der Schichten lag zwischen Al0,86V0,14 und Al0,19V0,81. Als Substrat dienten einkristalline (012) Saphirwafer. Die V/Al-Intermetallischen Phasen und V(Al) wurden im RTP-System ...

  19. Response to Signorovitch et al.

    Flot, Jean-François; Debortoli, Nicolas; Hallet, Bernard; Van Doninck, Karine

    2016-08-22

    Signorovitch et al.[1] comment that an Oenothera-like meiosis [2] could produce a pattern similar to what we observed in our study of natural isolates of the bdelloid rotifer Adineta vaga, which we attributed to horizontal gene transfers (HGTs) [3]. Indeed, our HGT hypothesis appears at first sight difficult to conciliate with their observation of a congruent pattern of allele sharing at four large loci possibly located on different chromosomes [4]. However, one might imagine conditions under which massive horizontal gene transfer between bdelloid individuals could produce such a pattern, notably if the individuals involved had previously lost most of their heterozygosity because of their exposure to frequent desiccation (which produces DNA double-strand breaks [5]). In the published A. vaga genome the loss of heterozygosity due to large-scale gene conversion events or break-induced replication covers only about 10% of the genome [6], but this percentage may be much higher in environmental isolates that often experience dessication. Besides, if an Oenothera-like mode of meiosis occurs in bdelloids frequently enough to be detected in a single sampling of 29 individuals (as in [4]), one would expect males and meiosis to be observed at least occasionally, and instances of congruent allele sharing across loci should turn up frequently in genetic surveys. This was not the case in [3]: among the 82 A. vaga individuals sequenced for four nuclear markers, no trio of individuals presented congruent patterns of shared sequences at different loci. For these reasons, and in the absence of any direct evidence for an Oenothera-like meiosis in bdelloids, we still consider inter-bdelloid HGTs a more parsimonious explanation for our results. PMID:27554651

  20. Atomic structure and oxygen deficiency of the ultrathin aluminium oxide barrier in Al/AlOx/Al Josephson junctions.

    Zeng, Lunjie; Tran, Dung Trung; Tai, Cheuk-Wai; Svensson, Gunnar; Olsson, Eva

    2016-01-01

    Al/AlOx/Al Josephson junctions are the building blocks of a wide range of superconducting quantum devices that are key elements for quantum computers, extremely sensitive magnetometers and radiation detectors. The properties of the junctions and the superconducting quantum devices are determined by the atomic structure of the tunnel barrier. The nanoscale dimension and disordered nature of the barrier oxide have been challenges for the direct experimental investigation of the atomic structure of the tunnel barrier. Here we show that the miniaturized dimension of the barrier and the interfacial interaction between crystalline Al and amorphous AlOx give rise to oxygen deficiency at the metal/oxide interfaces. In the interior of the barrier, the oxide resembles the atomic structure of bulk aluminium oxide. Atomic defects such as oxygen vacancies at the interfaces can be the origin of the two-level systems and contribute to decoherence and noise in superconducting quantum circuits. PMID:27403611

  1. Band edge modulation and interband optical transition in AlN:MgAl-ON nanotubes

    AlN nanotubes (NTs) have many novel characteristics and great potential applications in electronic and optoelectronic nanodevices. However, little is known about the influence of MgAl-ON co-doping effects on their optical properties. Here, we focus on investigating the electronic structures, clarify the interband optical transition mechanism and give a clear atomic picture for the important electron/hole localization centre in AlN:MgAl-ON NTs using the GGA-1/2 method. We find that the MgAl doping efficiency can be improved effectively due to ON doping in AlN NTs. The MgAl and ON form MgAl-ON defect complex easily along the AlN NT axis (C-axis). The MgAl-ON defect complex can result in a remarkable charge transfer around it and modify the valence band maximum and conduction band minimum significantly. Meanwhile, the MgAl-ON defect complex also forms the important exciton localization centre and effectively enhances the interband radiative recombination rate. Moreover, the light emission/absorption sensitively depends on its polarization. The parallel polarized light (E∥C) is much stronger than the perpendicular one (E⊥C). The MgAl-ON co-doping thus paves a new way for improving the performance of electronic and optoelectronic nanodevices based on AlN NTs. (papers)

  2. The theory of the moon in the al-Zij al-Kamil fi-l-taalim of Ibn al-Ha'im

    Puig i Tàrrech, Roser

    2000-01-01

    Al the beginning of Ihe thirteenth cenrury (60tH I 1204-1205) Abli Muhammad Abd al-Haqq al-Ghafiqi al-lshbiIi known as Ibn al-Ha'im composed his work entitled al-Zi] al-Kamil fi-l-Taalim in honour of the Caliph Abu Abd Allah Muhammad al-Nasir (who reigned from 1199- 1213). All we know of lbn al-Ha'im's live is that he came from Seville and that he appears to have worked in North Africa.

  3. Effect of Al coating conditions on laser weldability of Al coated steel sheet

    Jung-Han LEE; Jong-Do KIM; Jin-Seok OH; Seo-Jeong PARK

    2009-01-01

    Al coated steel sheets with excellent heat resistance, thermal reflection, and corrosion resistance are widely used in various applications. The laser weldability of the Al coated steel sheet for full penetration welding was reported. The phenomenon caused by intermixed aluminum and behavior of aluminum in the weld were investigated. Al coated steel sheets that have various thickness and coating mass were prepared for laser welding. The effects of parameters such as welding conditions and Al coating conditions were investigated. Al content mixed in the weld after laser welding was evaluated, and then a correlation between the mixed Al and mechanical properties was investigated. The results show that the Al-rich zones which have Fe-Al intermetallic compounds are found in the weld. The intermetallic compounds cause the decreased strength of the weld.

  4. Studies on SiC(p) reinforced Al-Al sub 3 Ni eutectic matrix composites

    An investigation on processing of Al-5.69wt% Ni eutectic with SiC particulate composites is reported. The intermetallic composites are prepared by elemental powder metallurgy route and sintered at two different temperatures, i.e., 600 degree C and 620 degree C. Results show that the metal matrix was Al-Al sub 3 Ni eutectic. The phase analysis by XRD identified the presence of Al sub 3 Ni and Al as dominant phases together with silicon and Al sub 4 C sub 3 phase as minor phases. The Al sub 4 C sub 3 and Si phases are formed during sintering due to SiC-Al interface reaction. SEM micrographs also reveal the formation of microvoid surrounding the SiC particle

  5. Diana Al-Hadid: Identity and Heritage

    Jungerberg, Tom; Smith, Anna; Borsh, Colleen

    2012-01-01

    Diana Al-Hadid's sculptures reflect the many locations, cultures, histories, and mythologies that have shaped her as an artist. In large-scale works which have the appearance of architectural ruins, Al-Hadid employs imagery drawn from many diverse interests including science and technology, history, and literature. She also incorporates images and…

  6. Kus on al-Zarqawi? / Aadu Hiietamm

    Hiietamm, Aadu, 1954-

    2005-01-01

    Suurbritannia nädalalehe Sunday Times andmetel on Iraagi tagaotsituim mässaja, terrorivõrgustiku al Qaeda liitlane Abu-Musab al-Zarqawi pärast USA raketirünnakus haavatasaamist riigist põgenenud

  7. Als je vrienden hebt dan win je

    Effing, R. (Robin); Huibers, T. (Theo); Krosse, de L. (Luc)

    2010-01-01

    Als je wint, heb je vrienden’ is een Nederlandse klassieker van Herman Brood en Henny Vrienten. Hiermee werd de gevoelige snaar bloot gelegd dat pas als je hebt gewonnen je vrienden hebt. Rijen dik, echte vrienden. In de politiek werkt het andersom; je moet vrienden (stemmen) hebben, ve

  8. MOSQUE ARCHITECTURE AS A SUSTAINABLE BUILDING IN URBAN (Case Study: Al Markas Al Islamic Mosque Makassar)

    Imriyanti Imriyanti

    2014-01-01

    Abstract Mosque Architecture is a part of Islamic architecture. Mosque should be fused with elements of nature because its function as a place to pray to God who created the universe. Al Markas Al Islamic Makassar mosque is used as a center of Islamic aspirations of the people and the government to accommodate all the activities of moslems in Makassar. Through this function, the provision of Al Markas Al Islamic mosque began from the desire of Islamic societies in Makassar, which want...

  9. High temperature creep behaviour of Al-rich Ti-Al alloys

    Sturm, D; Heilmaier, M; Saage, H [Otto von Guericke University Magdeburg, Institute for Materials and Joining Technology, PO Box 4120, D-39016 Magdeburg (Germany); Aguilar, J; Schmitz, G J; Drevermann, A [ACCESS e.V., Intzestrasse 5, D-52072 Aachen (Germany); Palm, M; Stein, F; Engberding, N [Max-Planck-Institut fuer Eisenforschung GmbH, Max-Planck-Str. 1, D-40237 Duesseldorf (Germany); Kelm, K; Irsen, S, E-mail: daniel.sturm@ovgu.d [Stiftung caesar, Electron Microscopy, Ludwig-Erhard-Allee 2, D-53175 Bonn (Germany)

    2010-07-01

    Compared to Ti-rich {gamma}-TiAl-based alloys Al-rich Ti-Al alloys offer an additional reduction of in density and a better oxidation resistance which are both due to the increased Al content. Polycrystalline material was manufactured by centrifugal casting. Microstructural characterization was carried out employing light-optical, scanning and transmission electron microscopy and XRD analyses. The high temperature creep of two binary alloys, namely Al{sub 60}Ti{sub 40} and Al{sub 62}Ti{sub 38} was comparatively assessed with compression tests at constant true stress in a temperature range between 1173 and 1323 K in air. The alloys were tested in the cast condition (containing various amounts of the metastable phases Al{sub 5}Ti{sub 3} and h-Al{sub 2}Ti) and after annealing at 1223 K for 200 h which produced (thermodynamically stable) lamellar {gamma}-TiAl + r-Al{sub 2}Ti microstructures. In general, already the as-cast alloys exhibit a reasonable creep resistance at 1173 K. Compared with Al{sub 60}Ti{sub 40}, both, the as-cast and the annealed Al{sub 62}Ti{sub 38} alloy exhibit better creep resistance up to 1323 K which can be rationalized by the reduced lamella spacing. The assessment of creep tests conducted at identical stress levels and varying temperatures yielded apparent activation energies for creep of Q = 430 kJ/mol for the annealed Al{sub 60}Ti{sub 40} alloy and of Q = 383 kJ/mol for the annealed Al{sub 62}Ti{sub 38} material. The latter coincides well with that of Al diffusion in {gamma}-TiAl, whereas the former can be rationalized by the instability of the microstructure containing metastable phases.

  10. Corrosion Studies of 2195 Al-Li Alloy and 2219 Al Alloy with Differing Surface Treatments

    Danford, M. D.; Mendrek, M. J.

    1998-01-01

    Corrosion studies of 2195 Al-Li and 2219 Al alloys have been conducted using the scanning reference electrode technique (SRET) and the polarization resistance (PR) technique. The SRET was used to study corrosion mechanisms, while corrosion rate measurements were studied with the PR technique. Plates of Al203 blasted, soda blasted and conversion coated 2219 Al were coated with Deft primer and the corrosion rates studied with the EIS technique. Results from all of these studies are presented.

  11. Assessment of the al corner of the ternary Al-Fe-Si system

    Eleno, Luiz; Vezelý, Josef; Sundman, Bo; Cieslar, Miroslav; Lacaze, Jacques

    2010-01-01

    The present work provides a review of the information available on the Al-rich corner of the Al-Fe-Si system as well as a CALPHAD type assessment making use of the COST 507 database as a starting point. The description of the intermetallic compounds has been modified to account for substitution of Al and Si in the ternary Al-Fe-Si system and to take new experimental information into account.

  12. The annealing behaviour of hydrogen implanted into Al metal and Al-Si alloy

    In the present experiment, we have investigated how defects and elements as additive play a role as trap site by observing the annealing behaviour of hydrogen implanted into Al and Al-Si alloy. It was found that hydrogen is trapped as molecules in grain boundaries of Si in Al. (author)

  13. Introducción de estudio de la proporción entre huesos largos y la reconstrucción de la estatura en restos mesoamericanos

    Genovés T., Santiago

    2010-01-01

    En esta investigación se analiza una manera de usar la longitud relativa de los huesos largos para estimar la estatura; sin embargo, esta se encuentra condicionada por la variabilidad intergrupal y adaptaciones biológicas al ambiente de cada población humana.

  14. Shadow evaporation of epitaxial Al/Al2O3/Al tunnel junctions on sapphire utilizing an inorganic bilayer mask

    Welander, Paul B.; Bolkhovsky, Vladimir; Weir, Terence J.; Gouker, Mark A.; Oliver, William D.

    2012-01-01

    This letter describes a new inorganic shadow mask that has been employed for the evaporation of all-epitaxial Al/Al2O3/Al superconducting tunnel junctions. Organic resists that are commonly used for shadow masks and other lift-off processes are not compatible with ultra-high vacuum deposition systems, and they can break down at even moderately elevated temperatures. The inorganic mask described herein does not suffer these same shortcomings. It was fabricated from a Ge/Nb bilayer, comprising ...

  15. Japanese version of the ALS-FTD-Questionnaire (ALS-FTD-Q-J).

    Watanabe, Yasuhiro; Beeldman, Emma; Raaphorst, Joost; Izumi, Yuishin; Yoshino, Hiide; Masuda, Michihito; Atsuta, Naoki; Ito, Satoru; Adachi, Tadashi; Adachi, Yoshiki; Yokota, Osamu; Oda, Masaya; Hanashima, Ritsuko; Ogino, Mieko; Ichikawa, Hiroo; Hasegawa, Kazuko; Kimura, Hideki; Shimizu, Toshio; Aiba, Ikuko; Yabe, Hayato; Kanba, Makoto; Kusumi, Kimiyoshi; Aoki, Tetsuya; Hiroe, Yu; Watanabe, Hirohisa; Nishiyama, Kazutoshi; Nomoto, Masahiro; Sobue, Gen; Nakashima, Kenji

    2016-08-15

    Amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) share common clinical, genetic and neuropathological features. Some ALS patients have behavioral/personality changes, which could result in significant obstacles in the care provided by family members and caregivers. An easy screening tool would contribute greatly to the evaluation of these symptoms. We translated the ALS-FTD-Questionnaire, developed in the Netherlands, into Japanese (ALS-FTD-Q-J) and examined the clinimetric properties (internal consistency, construct and clinical validity). Patients with ALS and/or behavioral variant FTD (bvFTD) were evaluated alongside healthy controls in this multicenter study. All ALS patients, regardless of bvFTD status, were further evaluated by the frontal behavioral inventory (FBI) and for frontal/executive function, cognition, anxiety/depression, and motor functions. Data from 146 subjects were analyzed: ALS (92), ALS-bvFTD (6), bvFTD (16), and healthy controls (32). The internal consistency of the ALS-FTD-Q-J was good (Cronbach α=0.92). The ALS-FTD-Q-J showed construct validity as it exhibited a high correlation with the FBI (r=0.79). However, correlations were moderate with anxiety/depression and low with cognitive scales, in contrast to the original report, i.e. a moderate correlation with cognition and a low correlation with anxiety/depression. The ALS-FTD-Q-J discriminated ALS patients from (ALS-)bvFTD patients and controls. Thus, the ALS-FTD-Q-J is useful for evaluating Japanese ALS/FTD patients. PMID:27423564

  16. DISTINGSI DAN DIASPORA TASAWUF ABÛ AL-HASAN AL-SHÂDHILÎ

    Saifulah Saifulah

    2015-01-01

    This article discusses Shâdhilîyah, one of the most recognized sufi orders, which possesses quite distinct aspects in the conception of its mystical teachings. This sufi order was founded by Abû al-H}asan al-Shâdhilî, a sufi who has moderate and open view of the worldly life. Al-Shâdhilî explained about how a sufi should behave towards and deal with worldly matters. Although al-Shâdhilî asserted that a person who practice tasawwuf should not pay more adoration on the worldly matters (hubb al-...

  17. The influence of Al content on the Zener relaxation of Fe-Al alloys

    The effect of Al content on the Zener relaxation peak of annealed Fe-Al alloys has been investigated using a computer-controlled automatic inverted torsion pendulum through the method of free decay and forced vibration. It has been shown that alloys with medium Al contents show strong relaxation while lower or higher Al contents lead to relatively weak Zener relaxation peaks. The Zener relaxation in Fe-Al alloys originates from the next-nearest-neighbour atom pairs and their interaction rather than the nearest-neighbour atom pairs. The latter may not produce Zener relaxation because of the ordered structure, which suppresses Zener relaxation

  18. Magnetism in bcc Fe-Al alloy

    Elzain, M.E. [Sultan Qaboos Univ., Al-Khod (Oman). Dept. of Phys.; Yousif, A.A. [Sultan Qaboos Univ., Al-Khod (Oman). Dept. of Phys.

    1994-11-01

    The magnetic moment {mu}, hyperfine field B{sub hf} and isomer shift IS at the Fe site in bcc Fe-Al alloys were calculated from first principle. Contrary to the belief that Al atoms reside in the iron lattice as magnetic holes, it was found that the local magnetic moment of Fe is decreased when Al is at a nearest neighbour site (NN), while it increases if Al is at a next-nearest neighbour site (NNN). Consequently, the average {mu} per Fe atom was found to be, initially, independent of Al content. Assuming a linear dependence of {mu}{sub Fe} on the number of Al atoms at NN and NNN sites, we calculated the average {mu}, which was found to agree with experimental results of cold worked alloys for disordered Fe-Al alloy. On the other hand, antiferromagnetic coupling appears in the CsCl ordered structures. The average B{sub hf} was also calculated and compared to experimental data and the trends in the IS are considered. (orig.)

  19. Comparative study on interface and bulk charges in AlGaN/GaN metal-insulator-semiconductor heterostructures with Al2O3, AlN, and Al2O3/AlN laminated dielectrics

    Zhu, Jie-Jie; Ma, Xiao-Hua; Chen, Wei-Wei; Hou, Bin; Xie, Yong; Hao, Yue

    2016-05-01

    In this paper, the interface and bulk charges in AlGaN/GaN metal-insulator-semiconductor (MIS) heterostructures with AlN, Al2O3, and Al2O3/AlN laminated dielectrics were studied. In situ plasma pretreatment resulted negligible interface trap states and voltage hysteresis. The fixed charge density at Al2O3/AlN (or Al2O3/barrier) interface was estimated to be 1.66 × 1013 cm-2 by using flat-band voltage shift, and the oxide bulk charge concentration was 2.86 × 1017 cm-3. The interface charge density at other interfaces were at the order of 1011 cm-2. Simulation results using the above charge density/concentration indicated that Al2O3/AlN interface fixed charges dominated the dielectric-related voltage shift in AlGaN/GaN MIS heterostructures, which caused a large voltage shift of -3 V with 10 nm Al2O3 thickness, while the flat-band voltage variety resulting from other types of charges was within 0.1 V.

  20. Tracing Al Shabaab’s Decision to Cooperate with Al Qaeda in Somalia (2008

    Adlini Ilma Ghaisany Sjah

    2014-02-01

    Full Text Available 'Al Shabaab, a Somali insurgent with predominantly nationalistic causes (alongside transnational [global Jihad] and Islamic goals made the choice to fight on behalf of Al Qaeda in 2008. The decision to do so contrasted with Al Shabaab’s previous behaviour of actively denying cooperation and distancing itself from Al Qaeda. This study aims to uncover factors that contributed to Al Shabaab’s decision through the use of process-tracing. The results show that Al Shabaab’s declaration of cooperation with Al Qaeda in August 2008 was brought about by a series of events that traced back to four factors: public reactions to the implementation of a Salafi ideology, the shift to a radical leadership, Al Shabaab’s inability to maintain stability in areas under its control and its increasing attacks by Al Shabaab on the Somali public. Al Shabaab pursued cooperation with Al Qaeda after realizing that their nationalistic preference was no longer achievable in the near future.' ' '

  1. Optical characterization of Al- and N-polar AlN waveguides for integrated optics

    Rigler, Martin; Buh, Jože; Hoffmann, Marc P.; Kirste, Ronny; Bobea, Milena; Mita, Seiji; Gerhold, Michael D.; Collazo, Ramon; Sitar, Zlatko; Zgonik, Marko

    2015-04-01

    Dispersion of the extraordinary and ordinary refractive indices of Al- and N-polar AlN waveguides is measured by multiple angle-of-incidence and spectroscopic ellipsometry techniques. The polarity-controlled AlN layers are grown by metal-organic chemical vapor deposition on (0001)-sapphire substrates. Taking into consideration the different surface morphologies of the Al- and N-polar AlN waveguides, we propose two optical models to describe the measured ellipsometry data. The results indicate that there is no difference between the refractive indices of the AlN grown in opposite directions, which confirms the potential of the AlN lateral polar structures for use in nonlinear optical applications based on quasi phase matching.

  2. Oxidation of Al2O3 continuous fiber-reinforced/NiAl composites

    Doychak, J.; Nesbitt, J. A.; Noebe, R. D.; Bowman, R. R.

    1992-01-01

    The 1200 C and 1300 C isothermal and cyclic oxidation behavior of Al2O3 continuous fiber-reinforced/NiAl composites were studied. Oxidation resulted in formation of Al2O3 external scales in a similar manner as scales formed on monolithic NiAl. The isothermal oxidation of an Al2O3/NiAl composite resulted in oxidation of the matrix along the fiber/matrix interface near the fiber ends. This oxide acted as a wedge between the fiber and the matrix, and, under cyclic oxidation conditions, led to further oxidation along the fiber lengths and eventual cracking of the composite. The oxidation behavior of composites in which the Al2O3 fibers were sputter coated with nickel prior to processing was much more severe. This was attributed to open channels around the fibers which formed during processing, most likely as a result of the diffusion of the nickel coating into the matrix.

  3. A Rechargeable Al/S Battery with an Ionic-Liquid Electrolyte.

    Gao, Tao; Li, Xiaogang; Wang, Xiwen; Hu, Junkai; Han, Fudong; Fan, Xiulin; Suo, Liumin; Pearse, Alex J; Lee, Sang Bok; Rubloff, Gary W; Gaskell, Karen J; Noked, Malachi; Wang, Chunsheng

    2016-08-16

    Aluminum metal is a promising anode material for next generation rechargeable batteries owing to its abundance, potentially dendrite-free deposition, and high capacity. The rechargeable aluminum/sulfur (Al/S) battery is of great interest owing to its high energy density (1340 Wh kg(-1) ) and low cost. However, Al/S chemistry suffers poor reversibility owing to the difficulty of oxidizing AlSx . Herein, we demonstrate the first reversible Al/S battery in ionic-liquid electrolyte with an activated carbon cloth/sulfur composite cathode. Electrochemical, spectroscopic, and microscopic results suggest that sulfur undergoes a solid-state conversion reaction in the electrolyte. Kinetics analysis identifies that the slow solid-state sulfur conversion reaction causes large voltage hysteresis and limits the energy efficiency of the system. PMID:27417442

  4. Magnetic properties and crystal structure of HoNiAl and UNiAl hydrides

    The effect of hydrogenation on the magnetic properties and crystal structure of 4f and 5f intermetallics was studied on HoNiAlH2.0, UNiAlH2.3 and UNiAlD2.1. The incorporation of hydrogen into HoNiAl leads to a decrease of the magnetic ordering temperature from 13 to 6 K, while it increases from 19 K to values in the range 90-100 K in the UNiAl-H system. The crystal lattices of all compounds are anisotropically expanded. Moreover, the crystal symmetry is lowered to orthorhombic in HoNiAlH2.0, but remains hexagonal for UNiAlH(D)x. Three different deuterium positions were found for both compounds. (c) 2000 American Institute of Physics

  5. AlON粉体的合成%Synthesis of AlON Powder

    赵小军; 茹红强; 张宁; 孙有政

    2009-01-01

    以α-Al_2O_3和AlN为原料,利用高温固相反应在氮气气氛下常压合成了AlON粉体.研究了成分配比、合成温度、保温时间对合成AlON粉体含量的影响,并通过热分析测试了合成过程热流和质量的变化.结果表明,当原料Al_2O_3和AlN的质量比为81:18、合成工艺为1750 ℃, 2 h时,得到AlON相的含量达到95%以上.

  6. Adherencia al tratamiento en la esquizofrenia

    Ruiz Manrique, Olatz

    2015-01-01

    [Es]La adherencia al tratamiento es un problema real en los pacientes esquizofrénicos, que dificulta su inserción en la sociedad y puede ocasionarles graves repercusiones médicas. Por ello, el objetivo de esta revisión es valorar la eficacia de las intervenciones psicoeducacionales con la ayuda del personal sanitario y/o familiares, en la adherencia al tratamiento de los pacientes esquizofrénicos. Se realizó una revisión sistemática para dar respuesta al objetivo planteado, analizando las res...

  7. Amyotrofinen lateraaliskleroosi (ALS) ja potilaan ohjaus

    Korkeaniemi, Lotta; Kaakinen, Leena

    2009-01-01

    Saimme opinnäytetyömme toimeksiantona Hyvinkään sairaalan sisätautien vuodeosastolta. Tavoitteena oli luoda ALS potilaille potilasopas trakeostomiasta ja sen kanssa elämisestä. Oppaan tarkoituksena on auttaa ALS potilaita päättämään, kuinka pitkälle he haluavat viedä heidän hengitystukihoitonsa. Samalla hoitajat saavat tuki materiaalia, jonka avulla he voivat käydä läpi hengitystukihoitoja ja erityisesti trakeostomiaan liittyviä asioita. ALS eli amyotrofinen lateraaliskleroosi on tahdona...

  8. Suspected variables among Al Sufi stars.

    Hoffleit, D.

    In the tenth century Al Sufi compiled a catalogue of some 1100 stars. J.E. Gore, around 1900, wrote extensively on the magnitudes of these stars. On intercomparing them with a few other catalogues, Gore surmised that some 38 stars appeared to show secular variations. Here all the Al Sufi magnitudes have been compared with numerous additional sources, but smooth secular variations are not substantiated although some stars seem to have undergone comparatively sudden changes after about 1600. About 70 Al Sufi stars are now named or suscpected variable stars, but nearly all with amplitudes under 0.3 V.

  9. TAFSIR SEMANTIK TERHADAP SURAT AL-KAFIRUN

    Imam Muslimin

    2011-10-01

    Full Text Available The problems about the reading of al-Qur’an is always interesting to be discussed, in which the use of Arabic includes sound or ‘nash’ is acrucial factor to understand the implicit meaning of the Arabic-written texts. Al-Qur’an discusses problem based on the society’s culture. Al-Kafirun discusses not only about the normative theology but more about sociological contexts in which it tends to show transparency, fight against fanaticism and regionalism. And all of the will bring to the first process of the making of the text meaning to the situational context that creates them.

  10. Linija za transport Al-polizdelkov

    Capl, Žiga

    2012-01-01

    V diplomski nalogi je predstavljena linija za transport Al-polizdelkov, ki je sestavljena iz dveh verižnih transporterjev in dveh manipulatorjev. Omenjeni transporterji morajo transportirati Al-polizdelke od sprejemnega mesta do poti v stiskalnico. V okviru diplomskega dela smo opravili analizo obstoječega ogrodja z naklonom, linije za transport Al-polizdelkov in podali možne rešitve za novo učinkovitejšo izvedbo. Na podlagi tehnično-tehnoloških zahtev smo izbrali najprimernejšo rešitev i...

  11. Characterization of AlInN/AlN/GaN Heterostructures with Different AlN Buffer Thickness

    Çörekçi, S.; Dugan, S.; Öztürk, M. K.; Çetin, S. Ş.; Çakmak, M.; Özçelik, S.; Özbay, E.

    2016-07-01

    Two AlInN/AlN/GaN heterostructures with 280-nm- and 400-nm-thick AlN buffer grown on sapphire substrates by metal-organic chemical vapor deposition (MOCVD) have been investigated by x-ray diffraction (XRD), atomic force microscopy (AFM), photoluminescence (PL) and Hall-effect measurements. The symmetric (0002) plane with respect to the asymmetric (10bar{1}2) plane in the 280-nm-thick AlN buffer has a higher crystal quality, as opposed to the 400-nm-thick buffer. The thinner buffer improves the crystallinity of both (0002) and (10bar{1}2) planes in the GaN layers, it also provides a sizeable reduction in dislocation density of GaN. Furthermore, the lower buffer thickness leads to a good quality surface with an rms roughness of 0.30 nm and a dark spot density of 4.0 × 108 cm-2. The optical and transport properties of the AlInN/AlN/GaN structure with the relatively thin buffer are compatible with the enhancement in its structural quality, as verified by XRD and AFM results.

  12. Evolution of ConAl clusters and chemisorption of hydrogen on ConAl clusters

    The growth behavior of ConAl (n = 1–15) and the chemisorptions of hydrogen on the ground state geometries have been studied using the density functional theory (DFT) within the generalized gradient approximation (GGA). The growth pattern for ConAl is Al-substituted Con+1 clusters, and it keeps the similar frameworks of the most stable Con+1 clusters except for n = 2, 3, and 6. The Al atom substitutes the surface atom of the Con+1 clusters for n ≤ 13. Starting from n = 14, the Al atom completely falls into the center of the Co-frame. The dissociation energy, the second-order energy differences, and the HOMO–LUMO gaps indicate that the magic numbers of the calculated ConAl clusters are 7, 9, and 13, corresponding to the high symmetrical structures. To my knowledge, this is the first time that a systematic study of chemisorption of hydrogen on cobalt aluminum clusters. The twofold bridge site is identified to be the most favorable chemisorptions site for one hydrogen adsorption on ConAl (n = 1–6, 8, 10), and two hydrogen adsorption on ConAl (n = 1–7), while threefold hollow site is preferred for one hydrogen adsorption on ConAl (n = 7, 9, 11–15) and two hydrogen adsorption on ConAl (n = 8–10, 12–15) clusters. The ground state structure of two hydrogen adsorption on Co11Al is exceptional. In general, the binding energy of both H and 2H of ConAl (n = 1–12) is found to increase with the cluster size. And the result shows that large binding energies of the hydrogen atoms and large fragmentation energies for Co11AlH and Co12AlH make these species behaving like magic clusters.

  13. Wali Allah menurut al-Hakim al-Tirmidzi dan Ibnu Taimiyyah

    Lilik Mursito

    2015-12-01

    Full Text Available The discussion about wali presented in the early time on the hand of al-Hakim al Tirmidzi, which reaps number of responses from Muslim scholar because of his misleading. One of them is Ibn Taimiyyah. Al-Hakim and Ibn Taymiyyah have their own view about wali with several distinctions. In the definition of wali, al-Hakim al-Tirmidzi used more general language than Ibn Taimiyyah, as well as characteristics, how to be wali, the classification, concept of karamah, and the concept of khatm al-awliya’. According to writer, al-Hakim al-Tirmidzi’s view about wali able to deepen our understanding about Sufism, meanwhile Ibn Taimiyyah’s view will led us to comprehend Sufism from modernist point of view. This paper conclude that: both of figures seen that wali of Allah are the servants submissive and obedient in running His command; according to al-Hakim al Tirmidzi, degree of wali can be reached purely from Allah’s bounty and the effort of servants themselves, while Ibn Taimiyyah seen that the degree could be reached in the way of faith and piety of the servant; al-Hakim al-Tirmidzi seen that karamah is the most urgent for wali, while Ibn Taimiyyah did not; al-Hakim al-Tirmidzi utilized the quality of deeds to measure the best people and purity of heart to measure the best wali, while Ibn Taymiyyah utilized the quality of deeds as the assessment standard to measure best people and wali.

  14. In Situ Fabrication of AlN Coating by Reactive Plasma Spraying of Al/AlN Powder

    Mohammed Shahien

    2011-10-01

    Full Text Available Reactive plasma spraying is a promising technology for the in situ formation of aluminum nitride (AlN coatings. Recently, it became possible to fabricate cubic-AlN-(c-AlN based coatings through reactive plasma spraying of Al powder in an ambient atmosphere. However, it was difficult to fabricate a coating with high AlN content and suitable thickness due to the coalescence of the Al particles. In this study, the influence of using AlN additive (h-AlN to increase the AlN content of the coating and improve the reaction process was investigated. The simple mixing of Al and AlN powders was not suitable for fabricating AlN coatings through reactive plasma spraying. However, it was possible to prepare a homogenously mixed, agglomerated and dispersed Al/AlN mixture (which enabled in-flight interaction between the powder and the surrounding plasma by wet-mixing in a planetary mill. Increasing the AlN content in the mixture prevented coalescence and increased the nitride content gradually. Using 30 to 40 wt% AlN was sufficient to fabricate a thick (more than 200 µm AlN coating with high hardness (approximately 1000 Hv. The AlN additive prevented the coalescence of Al metal and enhanced post-deposition nitriding through N2 plasma irradiation by allowing the nitriding species in the plasma to impinge on a larger Al surface area. Using AlN as a feedstock additive was found to be a suitable method for fabricating AlN coatings by reactive plasma spraying. Moreover, the fabricated coatings consist of hexagonal (h-AlN, c-AlN (rock-salt and zinc-blend phases and certain oxides: aluminum oxynitride (Al5O6N, cubic sphalerite Al23O27N5 (ALON and Al2O3. The zinc-blend c-AlN and ALON phases were attributed to the transformation of the h-AlN feedstock during the reactive plasma spraying. Thus, the zinc-blend c-Al

  15. PEMBARUAN MASLA╩AH DALAM MAQĀ╤ID AL- SHARĪ‘AH: TELAAH HUMANISTIS TENTANG AL-KULLIYYĀT AL-KHAMSAH

    Zaenuddin Mansyur

    2015-03-01

    Full Text Available Abstract:   In order to answer a variety of issues faced by human being in the current era, such as human rights abuses, social disintegration, and terrorism, the renewal of Islamic law in the level of theoretical and practical aspects is very urgent. This paper aims to examine one of the Islamic legal reform efforts, namely to build a more technical understanding of the concept of ma╣la╪ah contained in the maqā╣īd sharī‘ah, called the al-kulliyat al-khamsah. Therefore, the concept of ma╣la╪ah in ╪if╬ al-dīn is technically defined as al-╪urriyah al-i‘tiqād (freedom of religion and schools; in ╪if╬ al-nafs as al-karamat al-insān (human being breeding; in ╪if╬ al-nasl as ╪if╬ al-usrah (wholeness and harmony of the family; in ╪if╬ al-māl as al-ta╨ammun al-insān (social solidarity , and in ╪if╬ al-‘aql as al-╪uqūq as al-tarbiyāt (increasing human resources quality.Abstrak: Demi menjawab aneka persoalan zaman yang dihadapi manusia era sekarang, seperti penyelewengan terhadap HAM, disintegrasi sosial, dan terorisme, maka pembaharuan hukum Islam dalam tataran teoretis dan praktis urgen dilakukan. Tulisan ini bertujuan untuk mengkaji salah satu upaya pembaruan hukum Islam, yaitu membangun pemahaman yang lebih teknis terhadap konsep ma╣la╪ah yang terkandung dalam maqā╣īd sharī‘ah, yang disebut dengan al-kulliyāt al-khamsah. Oleh karena itu, konsep ma╣la╪ah dalam ╪if╬u al-dīn secara teknis dimaknai sebagai ╪urriyah al-i‘tiqād (kebebasan untuk beragama dan beraliran; dalam ╪if╬u al-nafs sebagai al-karāmāt al-insān (pemuliaan kemanusiaan; dalam ╪if╬u al-nasl sebagai ╪if╬u al-usrah (keutuhan dan keharmonisan keluarga; dalam ╪if╬u al-māl sebagai al-ta╨ammun al-insān (solidaritas sosial; dan dalam ╪if╬u al-‘aql sebagai al-╪uqūq al-tarbiyāt (peningkatan sumber daya manusia.

  16. Pesticides Linked to Raised Risk of ALS

    ... page: https://medlineplus.gov/news/fullstory_158737.html Pesticides Linked to Raised Risk of ALS One toxin ... MONDAY, May 9, 2016 (HealthDay News) -- Exposure to pesticides and other chemicals may increase the risk for ...

  17. Pesticides Linked to Raised Risk of ALS

    ... nlm.nih.gov/medlineplus/news/fullstory_158737.html Pesticides Linked to Raised Risk of ALS One toxin ... MONDAY, May 9, 2016 (HealthDay News) -- Exposure to pesticides and other chemicals may increase the risk for ...

  18. Stem Cells Deemed Safe for ALS Patients

    ... page: https://medlineplus.gov/news/fullstory_159627.html Stem Cells Deemed Safe for ALS Patients But further research needed to see if injections into spine would provide any benefit, researchers say To use the sharing features on ...

  19. ALS: Recent Developments from Genetics Studies.

    Therrien, Martine; Dion, Patrick A; Rouleau, Guy A

    2016-06-01

    Amyotrophic lateral sclerosis (ALS) is a fatal disorder that is characterized by a progressive degeneration of the upper and lower motor neurons. Most cases appear to be sporadic, but 5-10 % of cases have a family history of the disease. High-throughput DNA sequencing and related genomic capture tools are methodological advances which have rapidly contributed to an acceleration in the discovery of genetic risk factors for both familial and sporadic ALS. It is interesting to note that as the number of ALS genes grows, many of the proteins they encode are in shared intracellular processes. This review will summarize some of the recent advances and gene discovery made in ALS. PMID:27113253

  20. Het Nederlandse bos als vorm van bodemgebruik

    Slangen, L.H.G.; Boven, van B.

    1983-01-01

    Behandeling van de oppervlakte en verdeling van het bos en de veranderingen die hierin zijn opgetreden, met de bedrijfsgrootte-struktuur als belangrijke invalshoek daarbij; de rol van de overheid: doeleinden, instrumenten en effekten van het beleid

  1. In situ (Al3Zr + Al2O3np)/2024Al metal matrix composite with novel reinforcement distributions fabricated by reaction hot pressing

    Highlights: •(Al3Zr + Al2O3np)/2024Al MMC with a novel network distribution was tailored. •Al3Zr and Al2O3np were in situ synthesized at 740 °C using the 2024Al–ZrO2 system. •The effect of sintering parameters on Al3Zr morphology was investigated. •Influence of Al3Zr morphology on tensile properties of the composite was studied. -- Abstract: In situ hybrid (Al3Zr + Al2O3np)/2024Al metal matrix composites with unique controlled reinforcement distributions were fabricated using low energy ball milling and reactive hot pressing. The reaction system between 2024Al and ZrO2 was studied using differential thermal analysis (DTA). In situ formed aluminium oxide (Al2O3) and zirconium tri-aluminide (Al3Zr) with varying morphology and sizes were produced under different fabricating conditions. Al3Zr with varying morphologies such as particle, plate and flakes were observed. With a total 10 vol.% of reinforcements, the composite containing a three-dimensional network of closely spaced in situ synthesized Al3Zr and Al2O3 particles had a YS of 175 MPa and a UTS of 261 MPa, effectively strengthening the 2024Al matrix. The effect of different sintering conditions on the microstructure and tensile properties of the composite was systematically investigated

  2. Hans Freudenthal als docent en collega

    Verhulst, Ferdinand; Verhoef, Nellie

    2010-01-01

    Hans Freudenthal heeft een belangrijke invloed gehad op de ontwikkeling van het basiswiskundeonderwijs. Niet minder belangrijk was zijn activiteit als docent en onderzoeker gedurende tientallen jaren op het Mathematisch Instituut van de Universiteit Utrecht. Hoe waren toen zijn ideeën over onderwijs, hoe was hij als collega en hoe waren zijn colleges? Nellie Verhoef en Ferdinand Verhulst interviewden voormalige collega’s en studenten van Freudenthal.

  3. Effects of Al substitution on goethite formation

    Premoli, Alessandra Maria; Melis, Pietro; Gessa, Carlo Emanuele; Deiana, Salvatore Andrea

    1984-01-01

    Goethites containing up to 32.7 mole % Al were synthesized and characterized through diffractometry, spectrometry, DSC and chemical techniques. Results indicate that crystal growth was favoured or hindered depending on the percentage of aluminum incorporated into the structure. Goethites to which 5-10 mole % Al were initially added crystallized best, as shown by the highest crystallite dimensions calculated from X-ray and Mössbauer analyses, and by the lowest surface areas values. Over suc...

  4. Anerkennung als Voraussetzung gesellschaftlicher und unternehmerischer Teilhabe

    Eurich, Johannes; Brink, Alexander

    2003-01-01

    Angesichts des neuen Phänomens der sozialen Exklusion wird soziale Gerechtigkeit nicht mehr nur über die Verteilung von Gütern hergestellt, vielmehr spielt auch die Ebene der Partizipation eine Rolle. Anerkennung ist eine Grundvoraussetzung für Partizipation. Die Verfasser diskutieren Fragen der Unternehmensethik auf der Dimension der Anerkennung. Sie votieren für ein normatives Stakeholder-Management als freiwillige Verpflichtung, das auch strategischen Anforderungen gerecht werden kann. Als...

  5. Information als Gegenstand von Informationskompetenz. Eine Begriffsanalyse

    Ingold, Marianne

    2011-01-01

    Der Informationsbegriff als zentraler Gegenstand von Informationskompetenz wird in der bibliothekarischen Diskussion in der Regel nicht explizit thematisiert, sondern lässt sich aus Fachliteratur und Bibliothekspraxis nur implizit erschließen. Eine theoretische Beschäftigung mit dem Informationsbegriff ist jedoch unabdingbar, soll das Konzept "Informationskompetenz" auch außerhalb des bibliothekarischen Kontextes verständlich und nutzbar gemacht werden. Im vorliegenden Text, der sich als B...

  6. Plasma nitriding of Al 99.5

    Chen, H. -Y; Stock, H.-R.; Mayr, P.

    1993-01-01

    Aluminium nitride (AlN) is a very interesting ceramic because of its combination of properties such as high thermal stability, high hardness and an unusual combination of high thermal and low electrical conductivity. But it is very difficulty to obtain an AlN layer on the aluminium substrates by thermochemical nitriding process. Since a thin film of aluminium oxide existing on the surface of every aluminium substrate prevents the nitrogen atoms from diffusing into the aluminium lattice. Howev...

  7. Communication Support for People with ALS

    David Beukelman; Susan Fager; Amy Nordness

    2011-01-01

    Almost all people with amyotrophic lateral sclerosis (ALS) experience a motor speech disorder, such as dysarthria, as the disease progresses. At some point, 80 to 9 5 % of people with ALS are unable to meet their daily communication needs using natural speech. Unfortunately, once intelligibility begins to decrease, speech performance often deteriorates so rapidly that there is little time to implement an appropriate augmentative and alternative communication (AAC) intervention; therefore, app...

  8. Performance of the ALS injection system

    The authors started commissioning the Advanced Light Source (ALS) storage ring on January 11, 1993. The stored beam reached 60 mA on March 24, 1993 and 407 mA on April 9, 1993. The fast pace of storage ring commissioning can be attributed partially to the robust injection system. In this paper they describe the operating characteristics of the ALS injection system

  9. Del latín al rumano

    Montes Giraldo José Joaquín

    2003-06-01

    Full Text Available

    Marius Sala, Del latín al rumano. Versión española de Valeria Neagu, París, Unión Latina - Bucarest, Univers enciclopedic, 2002. El texto se dirige al lector corriente, no especialista, y por eso el aparato técnico-bibliográfico no se presenta en el curso de la exposición.

  10. Apoyo social como factor protector a la salud frente al Síndrome de Burnout en agentes de vialidad, México Social support as a protective health factor from burn-out syndrome in traffic agents, Mexico

    Carolina Aranda Beltrán; Manuel Pando Moreno; José G. Salazar Estrada; Teresa M. Torres López; Ma. Guadalupe Aldrete Rodríguez

    2010-01-01

    Objetivo: del trabajo fue determinar la relación entre las redes sociales de apoyo y el Síndrome de burnout en agentes de vialidad en una ciudad de México. Métodos: El diseño es transversal. La población la conformaron 875 hombres y mujeres que laboraban en cualquier turno. Se aplicaron dos instrumentos, la Escala de Valoración de Maslach Burnout Inventory, y el Inventario de Recursos Sociales de Díaz Veiga modificado. El análisis consistió principalmente en el determinar las posibles asociac...

  11. Next-generation sequencing of 28 ALS-related genes in a Japanese ALS cohort.

    Nakamura, Ryoichi; Sone, Jun; Atsuta, Naoki; Tohnai, Genki; Watanabe, Hazuki; Yokoi, Daichi; Nakatochi, Masahiro; Watanabe, Hirohisa; Ito, Mizuki; Senda, Jo; Katsuno, Masahisa; Tanaka, Fumiaki; Li, Yuanzhe; Izumi, Yuishin; Morita, Mitsuya; Taniguchi, Akira; Kano, Osamu; Oda, Masaya; Kuwabara, Satoshi; Abe, Koji; Aiba, Ikuko; Okamoto, Koichi; Mizoguchi, Kouichi; Hasegawa, Kazuko; Aoki, Masashi; Hattori, Nobutaka; Tsuji, Shoji; Nakashima, Kenji; Kaji, Ryuji; Sobue, Gen

    2016-03-01

    We investigated the frequency and contribution of variants of the 28 known amyotrophic lateral sclerosis (ALS)-related genes in Japanese ALS patients. We designed a multiplex, polymerase chain reaction-based primer panel to amplify the coding regions of the 28 ALS-related genes and sequenced DNA samples from 257 Japanese ALS patients using an Ion Torrent PGM sequencer. We also performed exome sequencing and identified variants of the 28 genes in an additional 251 ALS patients using an Illumina HiSeq 2000 platform. We identified the known ALS pathogenic variants and predicted the functional properties of novel nonsynonymous variants in silico. These variants were confirmed by Sanger sequencing. Known pathogenic variants were identified in 19 (48.7%) of the 39 familial ALS patients and 14 (3.0%) of the 469 sporadic ALS patients. Thirty-two sporadic ALS patients (6.8%) harbored 1 or 2 novel nonsynonymous variants of ALS-related genes that might be deleterious. This study reports the first extensive genetic screening of Japanese ALS patients. These findings are useful for developing genetic screening and counseling strategies for such patients. PMID:26742954

  12. Heterogeneous nucleation of solid Al from the melt by Al 3 Ti : Molecular dynamics simulations

    Wang, Junsheng

    2010-10-27

    It has been known experimentally for some time that Al3 Ti is a powerful nucleant for the solidification of aluminum from the melt; however, a full microscopic understanding is still lacking. To develop this understanding, we have performed molecular dynamics simulations of the nucleation and early stages of growth using published embedded atom method potentials for Al-Ti, but modified by us to stabilize the D 022 structure. We discover that Al3 Ti can indeed be very effective in promoting the growth of solid Al but the manner in which growth takes place depends sensitively on the surface on which the Al nucleates. In particular, complete growth of solid Al from the liquid on the (001) and (110) surfaces of Al3 Ti occurs at a lower temperature than on the (112) surface. This anisotropy agrees with observations in previous experiments. We explain this observation in terms of interfacial energies. On the preferential (111) surface of Al the solid-liquid interfacial energy is highest while the solid-vacuum energy is lowest. Our simulations also show that the extent of ordering taking place in liquid Al close to the Al 3 Ti substrate above the melting point correlates well with the effectiveness of the substrate as a nucleant below the melting temperature: this could provide a computationally efficient scheme to identify good nucleants. © 2010 The American Physical Society.

  13. Al4C3 Hydration Thermochemical Analysis for Burned Carbon-containing Refractories with Al

    YANG Ding'ao; YU Zhiming; FAN Liuwu

    2003-01-01

    In this paper, X-ray diffractogram analysis and SEM observation of Al4 C3 formed at high temperature from carbon-containing refractories with Al have been carried out.Aluminum added to carbon-containing refractories reacts with C(s)to form Al4 C3(s) gradually during heating from 600 ℃ to 1200℃.It is considered that the interlocked structure of Al4 C3 plate crystals promotes the outstanding increase of hot modulus of rupture of carbon-containing refractories with Al. The HMOR of carbon-containing refractories added with Al additive from 0 to 5wt% increases by 2.8 times being from 6.5MPa to 18.2MPa.After a thermochemical calculation for hydration reaction processes of Al4 C3 and H2O(g), the equilibrium partial pressure chart of H2O(g)in H2O-Al4C3-Al(OH)3 system vs various temperatures has been attained . The H2O (g) partial pressure in the air needed for the Al4 C3 hydration reaction is no more than 10~18 atm at the temperature below 120℃.It is considered that the burned carbon-containing refractories with Al is extremely easy to hydrate and the cracking of burned carbon-containing refractories is generated because that the hydration expansion is 2.11 times during transforming from Al4 C3 to Al(OH)3.The fundamental measure against hydration of the refractories is to insulate the refractories from H2O(g)by various means such as pitch impregnation or other sealing materials.

  14. DISTINGSI DAN DIASPORA TASAWUF ABÛ AL-HASAN AL-SHÂDHILÎ

    Saifulah Saifulah

    2015-09-01

    Full Text Available This article discusses Shâdhilîyah, one of the most recognized sufi orders, which possesses quite distinct aspects in the conception of its mystical teachings. This sufi order was founded by Abû al-H}asan al-Shâdhilî, a sufi who has moderate and open view of the worldly life. Al-Shâdhilî explained about how a sufi should behave towards and deal with worldly matters. Although al-Shâdhilî asserted that a person who practice tasawwuf should not pay more adoration on the worldly matters (hubb al-dunyâ, the person does not have to abhor and leave such lively aspects as wealth and position behind. The most important thing to a sufi, according to al-Shadhili, is how he obeys the requirements of shar‘ by avoiding away from immoral deeds and at the same time recognizing God in his heart (ma‘rifat Allâh. Al-Shâdhilî initiated tasawuf ‘amalî which is affiliated to the Ahl al-Sunnah wa al-Jamâ‘ah school, an Islamic mystical thought that adheres to the principles of sharî‘ah based on the foundation of al-Qur’ân dan H}adîth. The concept of al-Shâdhilî’s tasawuf has been subsequently revealed into the great sufi order spectrum, namely al-Shâdhilîyah, where during its historical development this sufi order has led to the emergence of many branches with different names.Keywords: Shâdhilîyah, open view, hubb al-dunyâ, ma‘rifat Allâh.

  15. Clinical trials for neuroprotection in ALS.

    Siciliano, G; Carlesi, C; Pasquali, L; Piazza, S; Pietracupa, S; Fornai, F; Ruggieri, S; Murri, L

    2010-07-01

    Owing to uncertainty on the pathogenic mechanisms underlying motor neuron degeneration in amyotrophic lateral sclerosis (ALS) riluzole remains the only available therapy, with only marginal effects on disease survival. Here we review some of the recent advances in the search for disease-modifying drugs for ALS based on their putative neuroprotective effetcs. A number of more or less established agents have recently been investigated also in ALS for their potential role in neuroprotection and relying on antiglutamatergic, antioxidant or antiapoptotic strategies. Among them Talampanel, beta-lactam antibiotics, Coenzyme Q10, and minocycline have been investigated. Progress has also been made in exploiting growth factors for the treatment of ALS, partly due to advances in developing effective delivery systems to the central nervous system. A number of new therapies have also been identified, including a novel class of compounds, such as heat-shock protein co-inducers, which upregulate cell stress responses, and agents promoting autophagy and mitochondriogenesis, such as lithium and rapamycin. More recently, alterations of mRNA processing were described as a pathogenic mechanism in genetically defined forms of ALS, as those related to TDP-43 and FUS-TLS gene mutations. This knowledge is expected to improve our understanding of the pathogenetic mechanism in ALS and developing more effective therapies. PMID:20406180

  16. Disordered crystal structure of 20H-AlON, Al10O3N8

    The disordered crystal structure of 20H-AlON (Al10O3N8) was determined by combined use of X-ray powder diffraction and transmission electron microscopy. The title compound is hexagonal with space group P63/mmc (Z=2) and the unit-cell dimensions are a=0.307082(5) nm, c=5.29447(8) nm and V=0.432376(12) nm3. The structural model showed the positional disordering of three of the six Al sites in the unit cell. The reliability indices calculated from the Rietveld method were Rwp=6.97%, S (=Rwp/Re)=1.68, Rp=5.45%, RB=5.13% and RF=4.56%. We interpreted the disordered structure of 20H-AlON as a statistical average of six different types of ordered structural configurations, which are composed of an octahedral [Al(O, N)6] layer and tetrahedral [Al(O, N)4] layers. We demonstrated the high correlations between the hexagonal unit-cell dimensions and the octahedral layer concentrations for AlON and SiAlON polytypoids. - Graphical abstract: Variations of a and c/(nO+nT) with nO/(nO+nT). The a and c are the hexagonal unit-cell dimensions of AlON, SiAlON and AlN. The nO and nT are, respectively, the numbers of octahedral and tetrahedral layers in the unit cells. The unit-cell dimensions in literature are plotted in black plus for AlON and black cross for SiAlON. The unit-cell dimensions of AlN are a=0.3110 nm and c=0.4980 nm. - Highlights: • Crystal structure of Al10O3N8 is determined by laboratory X-ray powder diffraction. • The atom arrangements are represented by the split-atom model. • Six types of ordered atom arrangements are derived from the disordered structure. • Hexagonal unit-cell dimensions changed systematically for AlON and SiAlON compounds

  17. Prinsip Pendidikan Karakter dalam Islam: Studi Komparasi Pemikiran Al-Ghazali dan Burhanuddin Al-Zarnuji

    Agus Setiawan

    2014-06-01

    Full Text Available The impelemtantion of character education that is done by the Indonesian government recently has been provoked by al-Ghazali and Burhanuddin al-Zarnuji long ago. It was proven by some written thoughts of al-Ghazali and Burhanuddin al-Zarnuji. They were very famous scientists in their era and widely welknown as educational experts who produced some phenomenal thoughts many people use today. Al-Ghazali and Burhanuddin al-Zarnuji lived in the era of Bani Abbasiyah monarchy, but Both of them lived in different era. Al-Ghazali was born first, then Burhanuddin al-Zarnuji. They had different mazhab, al-Ghazali went to the traditional principle of mazhab Syafi’I and Burhanuddin al-Zarnuji went to the modern principle of mazhab Hanafi. The differences, of course, would create a different thought. Still, they might have a similar principle of Islamic character education. The thoughts of character education of al-Ghazali have been poured in the “Ayyuha Walad” focusing to the students’ character building characterized by religiously obedient, skillfull of general and religious knowledge, socially helpful, affectionate, generous, good citizen, and coloring the society. Some applicable thoughts of character education of Ayyuha al-Walad of al-Gazhali to the contemporary education are: the balance of the happiness purposes of the recent life and the life after death, qana’ah and tawakal, affectionate, caring other, patience, honesty, philanthrophy, social works, generousity, democratic, peace makers, and patriotic. Those characters are also directed in the islamic character education nowdays. So that, the thoughts of al-Ghazali positively and responsively are absorbed by the Indonesian government to build the national character widely implementing in the national curriculum based on the local wisdom and the Islamic values. In the end, the students are able to live happily based on the Islamic rules by implementing the good behavior. Similar to the al

  18. Morphology of phase separation in AlN-Al2OC and SiC-AlN ceramics

    Solid solutions in the AIN-Al2OC and SiC-AlN systems were fabricated by hot-pressing powder mixtures in graphite dies. X-ray diffraction showed the samples to be single phases of 2H structure. The samples were annealed between 1600 degrees and 1900 degrees C for up to 1000 h. In the SiC-AlN system, optical microscopy and X-ray diffraction failed to reveal microstructural or phase changes. However, electron microscopy showed that samples had decomposed. Streaking of diffraction spots occurred along directions orthogonal to [012] planes (∼43 degrees off the c axis), which is approximately the direction along which the elastic energy function is a minimum. The orientation-dependent Young's modulus was also a minimum along this direction. In AlN-Al2OC, optical microscopy and X-ray diffraction indicated the occurrence of decomposition. The precipitates were disk-shaped with [001] orthogonal to the disks. The occurrence of decomposition along the [001] direction suggests that it is the elastically soft direction

  19. Nanocrack-induced leakage current in AlInN/AlN/GaN

    Here we report on the study of nano-crack formation in Al1−xInxN/AlN/GaN heterostructures, on its association with composition fluctuation and on its local electrical properties. It is shown here that indium segregation at nano-cracks and threading dislocations originating from the non-pseudomorphic AlN interlayer could be the cause of the high reverse-bias gate leakage current of Ni/Au Schottky contacts on Al1−xInxN/AlN/GaN heterostructures and significantly affects the contact rectifying behavior. Segregation of indium around crack tips in Al1−xInxN acting as conductive paths was assessed with conductive atomic force microscopy.

  20. Scattering induced by Al segregation in AlGaN/GaN heterostructures

    Liu, Xiwen; Lu, Yanwu, E-mail: ywlu@bjtu.edu.cn [Department of Physics, Beijing Jiaotong University, Beijing 100044 (China); Ji, Dong [School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85281 (United States)

    2015-08-17

    The effect of Al segregation near dislocations on the mobility of two-dimensional electron gas in AlGaN/GaN heterostructure-based high-electron-mobility transistors was investigated. Exponentially varied composition fluctuation was effective in describing Al segregation near dislocations when calculating scattering behavior. Mobility, which was limited by Al segregation surrounding dislocation lines, was calculated to be in the order of 10{sup 3} cm{sup 2}/Vs to 10{sup 6} cm{sup 2}/Vs. Results indicated that the mobility in AlGaN/GaN heterojunction was enhanced upon the reduction of dislocation density at low temperature. This study contributes to generating higher electron mobility in AlGaN/GaN heterojunctions.

  1. Scattering induced by Al segregation in AlGaN/GaN heterostructures

    The effect of Al segregation near dislocations on the mobility of two-dimensional electron gas in AlGaN/GaN heterostructure-based high-electron-mobility transistors was investigated. Exponentially varied composition fluctuation was effective in describing Al segregation near dislocations when calculating scattering behavior. Mobility, which was limited by Al segregation surrounding dislocation lines, was calculated to be in the order of 103 cm2/Vs to 106 cm2/Vs. Results indicated that the mobility in AlGaN/GaN heterojunction was enhanced upon the reduction of dislocation density at low temperature. This study contributes to generating higher electron mobility in AlGaN/GaN heterojunctions

  2. 60Co gamma radiation effect on AlGaN//AlN/GaN HEMT devices

    The testing techniques and experimental methods of the 60Co gamma irradiation effect on AlGaN/AlN/GaN high electron mobility transistors (HEMTs) are established. The degradation of the electrical properties of the device under the actual radiation environment are analyzed theoretically, and studies of the total dose effects of gamma radiation on AlGaN/AlN/GaN HEMTs at three different radiation bias conditions are carried out. The degradation patterns of the main parameters of the AlGaN/AlN/GaN HEMTs at different doses are then investigated, and the device parameters that were sensitive to the gamma radiation induced damage and the total dose level induced device damage are obtained. (authors)

  3. 60Co gamma radiation effect on AlGaN/AlN/GaN HEMT devices

    WANG Yan-Ping; LUO Yin-Hong; WANG Wei; ZHANG Ke-Ying; GUO Hong-Xia; GUO Xiao-Qiang; WANG Yuan-Ming

    2013-01-01

    The testing techniques and experimental methods of the 60Co gamma irradiation effect on AlGaN/AlN/GaN high electron mobility transistors (HEMTs) are established.The degradation of the electrical properties of the device under the actual radiation environment are analyzed theoretically,and studies of the total dose effects of gamma radiation on AlGaN/AlN/GaN HEMTs at three different radiation bias conditions are carried out.The degradation patterns of the main parameters of the AlGaN/AlN/GaN HEMTs at different doses are then investigated,and the device parameters that were sensitive to the gamma radiation induced damage and the total dose level induced device damage are obtained.

  4. Al-based precipitate evolution during high temperature annealing of Al implanted in Si

    Al-based precipitate evolution for 80 keV Al ions implanted in Si has been investigated. Precipitates are formed during high temperature annealings of 1 x 1015/cm2 implanted samples. They are located at two depths where Al concentration peaks are detected. Al atoms are gettered into the extended defects present in the crystal and/or precipitate when their concentration is higher than the solid solubility value at the annealing temperature. Increasing annealing time, precipitates dissolve out and only a small fraction of atoms diffuses into the sample, meanwhile the greater part evaporates from the sample. At 1 x 1013/cm2 dose Al concentration is below the solid solubility limit. The secondary defects are not detected and the dopant profile does not display anomalous peaks. Moreover, all the implanted Al is electrically active and remains in the sample during the first instant of annealing. At higher annealing times it diffuses out of the sample reducing the residual dose

  5. Microscopic Properties of Long-Period Ordering in Al-Rich TiAl Alloys

    Hata, S.; Nakano, T.; Kuwano, N.; Itakura, M.; Matsumura, S.; Umakoshi, Y.

    2008-07-01

    The ordering mechanism of long-period superstructures (LPSs) in Al-rich TiAl alloys has been investigated by high-resolution transmission electron microscopy (HRTEM). The LPSs are classified in terms of arrangements of base clusters with different shapes and compositions formed in Ti-rich (002) layers of L10-TiAl matrix: square Ti4Al, fat rhombus Ti3Al, and lean rhombus Ti2Al type clusters. The HRTEM observations revealed that antiphase boundaries of long-range-ordered LPS domains and short-range-ordered microdomains are constructed by various space-filling arrangements of the base clusters. Such a microscopic property characterized by the base clusters and their arrangements is markedly analogous to that of the {left< {{text{1,1/2,0}}} rightrangle } * special-point ordering alloys such as Ni-Mo.

  6. Observation of Electronic Shells and Characteristic Products from Mass Abundance Spectra of Al Cluster and Al-C Cluster Anions

    LIU Bing-Chen; ZHAI Hua-Jin; ZHOU Ru-Fang; NI Guo-Quan; XU Zhi-Zhan

    2000-01-01

    Using a laser vaporization/pulsed molecular beam cluster source, Al cluster anions and Al-C mixed cluster anions are produced and recorded by a time of flight mass spectrometer. Mass abundance spectra of the Al cluster anions in the size range from Al2 to Al42 show that Al-13, Al23, Al35, and slightly, Al37 are local maxima, as predicted by the electronic jellium model. Mixed clusters Aln C- and Aln C2 are also shown, among which the most abundant species are Al3 C2 , Al6 C2 , Al7 C- and Al7 C2 in the small size range. The formation mechanism of these products is discussed.

  7. Grain refinement of hypoeutectic Al-Si alloy prepared with ELTA by Al-4B master alloy

    WANG Ming-xing; MENG Xiang-yong; LIU Zhi-yong; LIU Zhong-xia; WENG Yong-gang; SONG Tian-fu; YANG Sheng

    2006-01-01

    Electrolytic low-titanium aluminum (ELTA) was produced by adding TiO2 powder to an industrial aluminum electrolyzer.The grain refining effect of Al-4B master alloy in the hypoeutectic Al-Si alloy prepared by using ELTA was investigated, and compared with those of Al-5Ti, Al-5Ti-1B and Al-4B master alloys in the similar alloy prepared by using pure Al. The results indicate that when Al-4B is added to the melt of the alloy prepared by using ELTA in terms of the Ti/B mass ratio of 5:1, the grain refining effect is better than those of Al-5Ti, Al-5Ti-1B and Al-4B master alloys. Thus, using Al-4B to refine the grain of Al-Si alloys prepared by using ELTA will possibly become a feasible way of obtaining Al-Si alloy with homogeneous and fine microstructure.

  8. In-Situ Synthesis of AlN Powders and Composite AlN Powders with Yttrium Addition

    郑新和; 王群; 林志浪; 李春国; 周美玲

    2002-01-01

    Using Al-Mg and Al-Mg-Y alloys as raw materials and nitrogen as gas reactants, AlN powders and composite AlN powders by in-situ synthesis method were prepared. AlN lumps prepared by the nitriding of Al-Mg and Al-Mg-Y alloys have porous microstructure, which is favorable for pulverization. They have high purity, containing 1.23%(mass fraction) oxygen impurity, and consisted of AlN single phase. The average particle size of AlN powders is 6.78 μm. Composite AlN powders consist of AlN phases and rare earth oxide Y2O3 phase. The distribution of particle size of AlN powders shows two peaks. In view of packing factor, AlN powders with such size distribution can easily be sintered to high density.

  9. Generation and evolution of nanoscale AlP and Al{sub 13}Fe{sub 4} particles in Al-Fe-P system

    Qiao, Huan; Gao, Tong; Zhu, Xiangzhen; Wu, Yuying; Qian, Zhao; Liu, Xiangfa, E-mail: xfliu@sdu.edu.cn

    2015-02-15

    Highlights: • Diffusion and gradual solid reactions between Al and Fe{sub x}P phases in Al-Fe-P alloy were investigated. • Nanoscale AlP clusters are in-situ generated and evolve during the whole process. • This novel Al-Fe-P alloy has an excellent low-temperature refining performance on hypereutectic Al-Si alloy. - Abstract: In this paper, the gradual solid reactions between Al and Fe{sub x}P phases in Al-Fe-P alloy were investigated. The results show that the whole reaction process undergoes four main stages: the diffusion of Al atom, the generation of (Al, Fe, P) intermediate compound, the precipitation of nano AlP and Al{sub 13}Fe{sub 4} clusters and their growth to submicron particles. The microstructure of Fe-P particles evolves from the “egg-type”, the “sponge-type” to the “sesame-cake” structure. AlP and Al{sub 13}Fe{sub 4} nano phases have in-situ generated and evolved during the whole process. The gradual reaction mechanism has been discussed. Furthermore, a novel Al-Fe-P alloy which contains (Al, Fe, P) intermediate compounds and nano AlP particles has been synthesized and its low-temperature refining performance on A390 alloy has also been investigated.

  10. TEM characterization of oxidized AlGaAs/AlAs nonlinear optical waveguides

    Guillotel, E; Langlois, C.; Ghiglieno, F.; Leo, G.; Ricolleau, C.

    2010-01-01

    Abstract The internal interfaces of multilayer Al x Ga 1-x As/AlAs nonlinear optical waveguides are investigated by high-angle annular-dark-field and energy-filtered scanning transmission electron microscopy, before and after partial wet oxidation of AlAs layers. Via a simple phenomenological model, the corresponding roughness parameters allow predicting the scattering-induced waveguide optical losses, which are in reasonable agreement with the experimental value of 0.5 cm -1. We also find...

  11. Modified Mechanism of Eutectic Silicon in Al2O3/Al-Si Alloy

    2001-01-01

    Al2O3/Al-Si alloy composite was manufactured by squeeze casting. The morphology of the eutectic silicon in the composite was observed by scanning electronic microscope (SEM), and the modified mechanism of eutectic silicon in the composite was approached. The alumina fiber in the composite can trigger twin during the growth of Al-Si eutectic and lead to the modification of eutectic silicon near the fiber.

  12. Two-Phase (TiAl+TiCrAl) Coating Alloys for Titanium Aluminides

    Brady, Michael P. (Inventor); Smialek, James L. (Inventor); Brindley, William J. (Inventor)

    1998-01-01

    A coating for protecting titanium aluminide alloys, including the TiAl gamma + Ti3Al (alpha(sub 2)) class, from oxidative attack and interstitial embrittlement at temperatures up to at least 1000 C. is disclosed. This protective coating consists essentially of titanium, aluminum. and chromium in the following approximate atomic ratio: Ti(41.5-34.5)Al(49-53)Cr(9.5-12.5)

  13. Effect of the interface in laminated composites of Al-1100 and Al-2024

    Laminated composites consisting of alternating layers of Al-1100 and Al-2024 were produced by hot rolling, with 45% Al-2024 volume fraction. These composites were subjected to cyclic thermal treatment (various numbers of cycles) and to isothermal treatment (various numbers of cycles) and to isothermal treatment (at peak temperature and for times equivalent to those of the thermal cycles. Microhardness, tensile and fatigue crack arrester modes) were studied in the initial state and after treatments. (E.G.)

  14. Another Security Improvement over the Lin et al.'s E-voting Scheme

    Asaar, Maryam Rajabzadeh; Mohajeri, Javad; Salmasizadeh, Mahmoud

    In 2003, Lin et al. have proposed an electronic voting scheme which can be utilized in large-scale elections, and claimed it detects double voting. But in this paper, by presenting an attack, we show that voters can successfully vote more than once without being detected. Hence, we propose a new modified scheme based on the Lin et al.'s scheme with the same efficiency to solve this weakness and analyze its security.

  15. Melt Processing and Characterization of Al-SiC Nanocomposite, Al, and Mg Foam Materials

    Ahmed M. Nabawy; Khalil Abdelrazek Khalil; Al-Ahmari, Abdulrahman M.; Sherif, El-Sayed M.

    2016-01-01

    In the present work, metallic foams of Al, Mg and an Al-SiC nanocomposite (MMNC) have been fabricated using a new manufacturing technique by employing melt infiltration assisted with an electromagnetic force. The aim of this investigation was to study and to develop a reliable manufacturing technique consisting of different types of metallic foams. In this technique, an electromagnetic force was used to assist the infiltration of Al-SiC slurry and of pure liquid metal into a leachable pattern...

  16. Fabrication, phase transformation studies, and characterization of SiC-AlN-Al2OC ceramics

    Principal focus was on phase transformation, microstructure development, and elevated temperature creep, with some effort on room- temperature mechanical properties of selected materials. Fabrication was largely hot pressing, although many of the compositions can be densified by pressureless sintering; hot pressing was to ensure full attainment of density with fine microstructure. Most of the work was on SiC-AlN and AlN-Al2OC pseudobinaries

  17. Synthesis of core–shell AlOOH hollow nanospheres by reacting Al nanoparticles with water

    Lozhkomoev, A. S.; Glazkova, E. A.; Bakina, O. V.; Lerner, M. I.; Gotman, I.; Gutmanas, E. Y.; Kazantsev, S. O.; Psakhie, S. G.

    2016-05-01

    A novel route for the synthesis of boehmite nanospheres with a hollow core and the shell composed of highly crumpled AlOOH nanosheets by oxidizing Al nanopowder in pure water under mild processing conditions is described. The stepwise events of Al transformation into boehmite are followed by monitoring the pH in the reaction medium. A mechanism of formation of hollow AlOOH nanospheres with a well-defined shape and crystallinity is proposed which includes the hydration of the Al oxide passivation layer, local corrosion of metallic Al accompanied by hydrogen evolution, the rupture of the protective layer, the dissolution of Al from the particle interior and the deposition of AlOOH nanosheets on the outer surface. In contrast to previously reported methods of boehmite nanoparticle synthesis, the proposed method is simple, and environmentally friendly and allows the generation of hydrogen gas as a by-product. Due to their high surface area and high, slit-shaped nanoporosity, the synthesized AlOOH nanostructures hold promise for the development of more effective catalysts, adsorbents, vaccines and drug carriers.

  18. Strain Rates and Grain Growth in Al 5754 and Al 6061 Friction Stir Spot Welds

    Gerlich, A.; Yamamoto, M.; North, T. H.

    2007-06-01

    The stir zone temperature and microstructures are compared in friction stir spot welds produced in Al 5754 and Al 6061 alloys. Electron backscattered diffraction was used to determine the relationship between tool rotation speed during welding and final stir zone grain size. Comparison of the grain sizes in rapidly quenched welds with those in air-cooled joints confirmed that grain growth occurred only in Al 6061 spot welds. There was no evidence of abnormal grain growth in the stir zones of Al 6061 welds; the final grain size could be represented using an Arrhenius equation. The strain rates during welding were determined by incorporating the stir zone temperature and average subgrain sizes in quenched spot welds in the Zener-Hollomon relation. When the tool rotation speed increased from 750 to 3000 RPM, the strain rate values ranged from 180 to 497 s-1 in Al 5754 spot welds and from 55 to 395 s-1 in Al 6061 spot welds. It is suggested that a no-slip boundary condition may be appropriate during numerical modeling of Al 5754 and 6061 friction stir spot welding. This is not the case during Al 7075, Al 2024, and Mg-alloy AZ91 spot welding because spontaneous melting facilitates slippage at the tool contact interface.

  19. Study on Mg/Al Weld Seam Based on Zn–Mg–Al Ternary Alloy

    Liming Liu

    2014-02-01

    Full Text Available Based on the idea of alloying welding seams, a series of Zn–xAl filler metals was calculated and designed for joining Mg/Al dissimilar metals by gas tungsten arc (GTA welding. An infrared thermography system was used to measure the temperature of the welding pool during the welding process to investigate the solidification process. It was found that the mechanical properties of the welded joints were improved with the increasing of the Al content in the Zn–xAl filler metals, and when Zn–30Al was used as the filler metal, the ultimate tensile strength could reach a maximum of 120 MPa. The reason for the average tensile strength of the joint increasing was that the weak zone of the joint using Zn–30Al filler metal was generated primarily by α-Al instead of MgZn2. When Zn–40Al was used as the filler metal, a new transition zone, about 20 μm-wide, appeared in the edge of the fusion zone near the Mg base metal. Due to the transition zones consisting of MgZn2- and Al-based solid solution, the mechanical property of the joints was deteriorated.

  20. Tetragonal phase in Al-rich region of U-Fe-Al system

    Meshi, L. [Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105 (Israel); Zenou, V. [Nuclear Research Center-Negev, P.O. Box 9001, Beer-Sheva (Israel); Ezersky, V. [Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105 (Israel); Munitz, A. [Nuclear Research Center-Negev, P.O. Box 9001, Beer-Sheva (Israel); Talianker, M. [Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105 (Israel)]. E-mail: mital@bgumail.bgu.ac.il

    2005-10-27

    A new ternary aluminide U{sub 2}FeAl{sub 20} with the approximate composition Al-4.2at% Fe-8.5at% U was observed in the Al-rich corner of the U-Al-Fe system. Transmission electron microscopy and electron microdiffraction technique were used for characterization of the structure of this phase. It has a tetragonal unit cell with the parameters a=12.4A and c=10.3A and can be described by the space group I4-bar 2m.

  1. Tetragonal phase in Al-rich region of U-Fe-Al system

    A new ternary aluminide U2FeAl20 with the approximate composition Al-4.2at% Fe-8.5at% U was observed in the Al-rich corner of the U-Al-Fe system. Transmission electron microscopy and electron microdiffraction technique were used for characterization of the structure of this phase. It has a tetragonal unit cell with the parameters a=12.4A and c=10.3A and can be described by the space group I4-bar 2m

  2. AlN/IDT/AlN/Sapphire SAW Heterostructure for High-Temperature Applications.

    Legrani, Ouarda; Aubert, Thierry; Elmazria, Omar; Bartasyte, Ausrine; Nicolay, Pascal; Talbi, Abdelkrim; Boulet, Pascal; Ghanbaja, Jaafar; Mangin, Denis

    2016-06-01

    Recent studies have evidenced that Pt/AlN/Sapphire surface acoustic wave (SAW) devices are promising for high-temperature high-frequency applications. However, they cannot be used above 700°C in air atmosphere as the Pt interdigital transducers (IDTs) agglomerate and the AlN layer oxidizes in such conditions. In this paper, we explore the possibility to use an AlN protective overlayer to concurrently hinder these phenomena. To do so, AlN/IDT/AlN/Sapphire heterostructures undergo successive annealing steps from 800°C to 1000°C in air atmosphere. The impact of each step on the morphology, microstructure, and phase composition of AlN and Pt films is evaluated using optical microscopy, scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction (XRD), and secondary ion mass spectroscopy (SIMS). Finally, acoustical performance at room temperature of both protected and unprotected SAW devices are compared, as well as the effects of annealing on these performance. These investigations show that the use of an overlayer is one possible solution to strongly hinder the Pt IDTs agglomeration up to 1000°C. Moreover, AlN/IDT/AlN/Sapphire SAW heterostructures show promising performances in terms of stability up to 800°C. At higher temperatures, the oxidation of AlN is more intense and makes it inappropriate to be used as a protective layer. PMID:27076407

  3. Sintering Behavior of CNT Reinforced Al6061 and Al2124 Nanocomposites

    2014-01-01

    Ball milling and spark plasma sintering were successfully used to produce carbon nanotube reinforced Al6061 and Al2124 nanocomposites which have potential applications in the fields of aerospace, automotive, electronics, and high precision instrumentation. Al2124 and Al6061 nanocomposite powders containing 0.5 to 2 wt.% CNTs prepared through sonication and wet ball milling were spark plasma sintered at 400, 450, and 500°C for 20 minutes under a pressure of 35 MPa. CNTs were better dispersed, ...

  4. Microstructure and mechanical properties of Al2O3/TiAl composite

    AI Tao-tao; WANG Fen; ZHU Jian-feng

    2006-01-01

    Al2O3/TiAl composites were fabricated by PAXD (pressure-assisted exothermic dispersion) method. The effects of Nb2O5 content on the microstructure and mechanical properties of the composites were investigated. The results show that the ultimate phases of the composite consist of TiAl, Ti3Al, Al2O3 and a small amount of NbAl3. SEM reveals that a submicron γ+(α2/γ) dual phases structure can be presented after sintered at 1 200 ℃. Furthermore, with the increase of Nb2O5 content, the ratio of TiAl to Ti3Al phase decreases correspondingly, the grains of the composites are remarkably refined, and the produced Al2O3 particles are uniformly dispersed. When 6% Nb2O5 is added, the composite has the best comprehensive properties. It exhibits a Vickers hardness of 4.77 GPa and a bending strength of 642 MPa. Grain-refinement and dispersion-strengthening are the main strengthening mechanisms.

  5. Production of AlN-Si-Al Ceramic-Metal Composites via Pressurless Infiltration Method

    KALEMTAŞ, Ayşe; ARSLAN, Gürsoy; KARA, Ferhat

    2014-01-01

    In this work, the production of light (∼2,9 g/cm3) and dense (> 99 %) AlN based ceramic metal composites was conducted by the pressureless melt infiltration method. These composites contain a high ceramic volume fraction (> 50 vol %) which is the result of the reaction between Si3N4 and Al in the Si3N4-Al system. The production of the ceramic-metal composites was achieved via infiltrating 2024 Al alloys at different temperatures and holding times into the porous pellets which were prepared us...

  6. Coating of a layer of Au on Al13 : The findings of icosahedral Al@Al12Au20- and Al12Au202- fullerenes using ab initio pseudopotential calculations

    Kumar, Vijay

    2009-02-01

    We report results of ab initio pseudopotential calculations on the nanocoating of gold on an icosahedral Al13 cluster and the findings of icosahedrally symmetric endohedral Al@Al12Au20- and empty cage Al12Au202- compound fullerenes formed of metal atoms. Twelve Al atoms cap the pentagonal faces of a dodecahedral Au20 cage in which each Au atom has three Al atoms and three Au atoms as nearest neighbors. Mixing of Al13 and Au20 magic clusters leads to a large heat of formation of 0.55 eV/atom and high stability of the Al@Al12Au20 compound fullerene. The binding energies of Al12Au20 and Al@Al12Au20 are 3.017 and 3.007 eV/atom, respectively, which are much larger than 2.457 eV/atom for Au32 fullerene, leading to the possibility of their high abundance.

  7. Deletion of ALS5, ALS6 or ALS7 increases adhesion of Candida albicans to human vascular endothelial and buccal epithelial cells

    Zhao, Xiaomin; Oh, Soon-Hwan; Hoyer, Lois L.

    2007-01-01

    C. albicans yeast forms deleted for ALS5, ALS6 or ALS7 are more adherent than a relevant control strain to human vascular endothelial cell monolayers and buccal epithelial cells. In the buccal and vaginal reconstituted human epithelium (RHE) disease models, however, mutant and control strains caused a similar degree of tissue destruction. Deletion of ALS5 or ALS6 significantly slowed growth of the mutant strain; this phenotype was not affected by addition of excess uridine to the culture medi...

  8. Melting Transition of Small Aluminium Clusters Al11-20

    ZHANG Wei; ZHANG Feng-Shou; ZHU Zhi-Yuan

    2007-01-01

    Heat capacities of small aluminium clusters Al11-20 are investigated using MD simulation with empirical manybody Gupta potential. The heat capacities of some clusters Al11, Al12, Al13 and Al19 show well-defined peaks while the heat capacities of Al15-18 indicate a gradual melting transition. The spectra of isomers obtained by quenches along the MD trajectory give good interpretation for those results.

  9. Kerja Perspektif Al-Qur'an

    Ahmad Munir

    2011-05-01

    Full Text Available The moslem ethics of life is based on movement as ex­pressed in certain terms like al-sharī’ah, al-tarīqah, al-sirāt, al-sabīl and al-manhaj, that make sense of way and teachings to achieve good life. Islam obliges and gives appreciation of the achievements of Mus­lims. The Qur’an uses several terms to refer to such work; ‘charity, kasb, juhd, ibtighâ’, sa ’yu and su ’âl. From this concept, the Qur’an considers work as nob­le, while begging is despicable. Work means thankful to God for the potential He bestows. The Qur’an promotes work not only because it is the way to achieve the wealth, but also because it possesses the its sacred value for the benefit of fulfilling livelihood. Therefore the work should also be done based on ethical values .

  10. 26Al in the interstellar medium

    Several different lines of physical reasoning have converged on the importance of the radioactive nucleus 26Al. The sciences of meteoritics, nucleosynthesis, gamma-ray astronomy, galactic chemical evolution, solar system formation, and interstellar chemistry all place this nucleus in a central position with possible profound implications. Perhaps more importantly the study of this radioactivity can unite these diverse fields in a complicated framework which will benefit all of them. This review traces the evolution of ideas concerning 26Al in the context of these disciplines. 26Al was first discussed for the possibility that its decay energy could melt meteorite parent bodies, and its daughter, 26Mg, was later found in meteorites with enhanced abundance. It was also among the first radioactivities expected to be synthesized in interestingly large quantities in nulceosynthetic events. The first definitive detection of gamma-rays from an interstellar radioactivity is that of 1.809 MeV gamma-rays from 26Al. This discovery has many implications, some of which are outlined here. The whole problem of isotopic anomalies in meteorites is greatly influenced by the specific issues surrounding excess 26Mg, whether it represents in situ decay of 26Al or memory of conditions of the ISM. The relationships among these ideas and their implications are examined. (orig.)

  11. Cd ion implantation in AlN

    Highlights: ► Cd ion implanted in AlN thin films. ► XRD shows damage produced during implantation. ► Annealing recovers damage in low fluence sample. ► RBS/C measurements show that Cd occupies substitutional sites. ► Cd can be a good candidate for p-type doping. - Abstract: AlN thin films were implanted with cadmium, to fluences of 1 × 1013 and 8 × 1014 at/cm2. The implanted samples were annealed at 950 °C under flowing nitrogen. Although implantation damage in AlN is known to be extremely stable the crystal could be fully recovered at low fluences. At high fluences the implantation damage was only partially removed. Implantation defects cause an expansion of the c-lattice parameter. For the high fluence sample the lattice site location of the ions was studied by Rutherford Backscattering/Channelling Spectrometry. Cd ions are found to be incorporated in substitutional Al sites in the crystal and no significant diffusion is seen upon thermal annealing. The observed high solubility limit and site stability are prerequisite for using Cd as p-type dopant in AlN.

  12. Survey and alignment at the ALS

    This paper describes survey and alignment at the Lawrence Berkeley National Laboratory's Advanced Light Source (ALS) accelerators from 1993 to 1995. The ALS is a 1.0 - 1.9 GeV electron accelerator producing extremely bright synchrotron light in the UV and soft-X-ray wavelengths. At the ALS, electrons are accelerated in a LINAC to 50 MeV, injected into a booster ring for further acceleration and finally injected into the storage ring. This is shown schematically in Figure 1. The storage ring, some 200 m in circumference, has been run with electron currents above 400 mA with lifetimes as high as 24 hours. The ALS is a third generation light source and requires for efficient storage ring operation, magnets aligned to within 150 mm of their ideal position. To accomplish this a network of monuments was established and their positions measured with respect to one another. The data was reduced using GEONET'' and STAR*NET'' software. Using the monuments as reference points, magnet positions were measured and alignment confirmed using the Kem Electronic Coordinate Determination System (ECDS''). A number of other papers dealing with survey and alignment (S ampersand A) at the ALS have been written that may further elucidate some details of the methods and systems described in this paper

  13. Direct laser cooling Al+ ions optical clocks

    Zhang, J; Luo, J; Lu, Z H

    2016-01-01

    Al$^+$ ions optical clock is a very promising optical frequency standard candidate due to its extremely small blackbody radiation shift. It has been successfully demonstrated with indirect cooled, quantum-logic-based spectroscopy technique. Its accuracy is limited by second-order Doppler shift, and its stability is limited by the number of ions that can be probed in quantum logic processing. We propose a direct laser cooling scheme of Al$^+$ ions optical clocks where both the stability and accuracy of the clocks are greatly improved. In the proposed scheme, two Al$^+$ ions traps are utilized. The first trap is used to trap a large number of Al$^+$ ions to improve the stability of the clock laser, while the second trap is used to trap a single Al$^+$ ions to provide the ultimate accuracy. Both traps are cooled with a continuous wave 167 nm laser. The expected clock laser stability can reach $9.0\\times10^{-17}/\\sqrt{\\tau}$. For the second trap, in addition to 167 nm laser Doppler cooling, a second stage pulsed ...

  14. Epistemologi Penafsiran Ilmiah al-Qur’an

    Sujiat Zubaidi Saleh

    2011-04-01

    Full Text Available The main objective in interpretating al-Qur’an is to explain the will of God and the operationalization of the will in the field of faith, laws, or ethics. At the phase of Islamic civilization, when the linguistic and philosophy science codified, raises the various method (manhaj, and interpretation streams (ittijahat, exegesis school (madzhab of al-Qur’an. In addition, also found in various shades of interpretation such as: fiqhi, kalami, balaghi, and isyari/ sufi, even philosophical. It was also discovered methods of tafsir ‘ilmi oriented to the utilization of the discovering science in order to prove the truth of scientific fact. The last pattern was ignited pro and contra among scholars and mufassir. As we know that alQur’an was not descended in the condition of cultural vacuum but it is a form of dialectics and the response to the condition and social situation, politic, and religion. This is relevant to the characteristics of al-Qur’an which can be applied throughout the periods. As we understood that interpretation is one of reflections of thought and civilization products. It always developed and influenced by the dynamics of human civilization, so in its development, science and al-Qur’an can be brought together in dialogue, although with some prerequisites specified interpretation.

  15. MOSQUE ARCHITECTURE AS A SUSTAINABLE BUILDING IN URBAN (Case Study: Al Markas Al Islamic Mosque Makassar

    Imriyanti Imriyanti

    2014-02-01

    Full Text Available Abstract Mosque Architecture is a part of Islamic architecture. Mosque should be fused with elements of nature because its function as a place to pray to God who created the universe. Al Markas Al Islamic Makassar mosque is used as a center of Islamic aspirations of the people and the government to accommodate all the activities of moslems in Makassar. Through this function, the provision of Al Markas Al Islamic mosque began from the desire of Islamic societies in Makassar, which wants the Islamic center to be equipped with facilities and infrastructure as well as architectural, monumental buildings and structures that can be last for hundreds of years (continuous, blend with the environment, and also can be used by the public. Having regard to the function of a mosque especially at the Al Markas Al Islamic Makassar mosque, then the problem that arise is how the Al Markas Al Islamic mosque can be survived/sustainable  in order  to function  as a place  of worship  and  as a center  of Islam.  This research  is a descriptive qualitative research that is trying to generate data in the form of systematic and accurate picture of the object of study. The sustaiprophetlity  of Al Markas AL Islamic mosque can be known through the concept of Islam  in accordance with the view of Islam as well as the sustaiprophetlity of the buildings that seen in the spatial pattern of the mosque, appearance, natural lighting, natural ventilation, and user behavior of the mosque. Keywords: mosque architecture, sustaiprophetlity, view of Islam     Abstrak Arsitektur masjid merupakan bagian dari arsitektur Islam. Bangunan masjid sebaiknya dapat menyatu dengan unsur alam karena masjid difungsikan sebagai wadah dalam bersujud/sembahyang  kepada Allah SWT yang menciptakan alam semesta ini. Masjid Al Markas Al Islamic Makassar merupakan kompleks kegiatan Islam yang digunakan sebagai pusat aspirasi masyarakat  dan pemerintahan  yang dapat menampung

  16. Instability of TiC and TiAl3 compounds in Al-10Mg and Al-5Cu alloys by addition of Al-Ti-C master alloy

    2006-01-01

    The performance of Al-Ti-C master alloy in refining Al-10Mg and A1-5Cu alloys was studied by using electron probe micro-analyzer (EPMA) and X-ray diffractometer (XRD) analysis.The results indicate that there are obvious fading phenomena in both Al-10Mg and Al-5Cu alloys with the addition of Al-5Ti-0.4C refiner which contains TiC and TiAl3 compounds.Mg element has no influence on the stability of TiC and TiAl3, while TiC particles in Al-10Mg alloy react with Al to form Al4C3 particles, resulting in the refinement fading.However, TiC particles are relatively stable in Al-5Cu alloy, while TiAl3 phase reacts with Al2Cu to produce a new phase Ti(Al, Cu)2, which is responsible for the refinement fading in Al-5Cu alloy.These indicate that the refinement fading will not occur only when both the TiC particles and TiAl3 compound of Al-Ti-C refiner are stable in Al alloys.

  17. Study of corrosion inhibition of coupled Al2Cu–Al and Al3Fe–Al by cerium cinnamate using scanning vibrating electrode technique and scanning ion-selective electrode technique

    Highlights: • The corrosion inhibition of coupled Al2Cu–Al and Al3Fe–Al by cerium cinnamate was studied. • SVET and SIET were used to study the distribution of current densities and pH. • The corrosion inhibition mechanisms were analyzed. - Abstract: The galvanic corrosion of the coupled Al2Cu and Al as well as Al3Fe and Al in 0.005 M NaCl in and without the presence of cerium cinnamate was studied. Scanning vibrating electrode technique and scanning ion-selective electrode technique were used to measure the distribution of current densities and pH. The results indicate that cerium cinnamate played inhibiting effect on the coupling corrosion of Al2Cu–Al and Al3Fe–Al. For Al2Cu–Al, the inhibition was mainly influenced by the production of cerium oxide/hydroxide on Al2Cu surface. However, for Al3Fe–Al, the inhibition was mainly influenced by the adsorbed cerium cinnamate on the Al3Fe surface

  18. MgAl2O4–-Al2O3 solid solution interaction: mathematical framework and phase separation of -Al2O3 at high temperature

    Soumen Pal; A K Bandyopadhyay; S Mukherjee; B N Samaddar; P G Pal

    2011-07-01

    Although existence of MgAl2O4–-Al2O3 solid solution has been reported in the past, the detailed interactions have not been explored completely. For the first time, we report here a mathematical framework for the detailed solid solution interactions of -Al2O3 in MgAl2O4 (spinel). To investigate the solid solubility of -Al2O3 in MgAl2O4, Mg–Al spinel (MgO–Al2O3; = 1, 1.5, 3, 4.5 and an arbitrary high value 30) precursors have been heat treated at 1000°C. Presence of only non-stoichiometric MgAl2O4 phase up to = 4.5 at 1000°C indicates that alumina (as -Al2O3) present beyond stoichiometry gets completely accommodated in MgAl2O4 in the form of solid solution. → alumina phase transformation and its subsequent separation from MgAl2O4 has been observed in the Mg–Al spinel powders ( > 1) when the 1000°C heat treated materials are calcined at 1200°C. In the mathematical framework, unit cell of MgAl2O4 (Mg8Al16O32) has been considered for the solid solution interactions (substitution of Mg2+ ions by Al3+ ions) with -Al2O3. It is suggested that combination of unit cells of MgAl2O4 takes part in the interactions when > 5 (MgO–Al2O3).

  19. Al- Khwarizmi and axiomatic foundation of algebra

    This paper intends to investigate the axiomatic foundations of algebra, as they were presented in the book of algebra of al-Khwarizmi (9 th century), and as they were developed in many subsequent Arabic works. The paper gives also a description of algebra evolution towards a discipline independent ofgeometry and arithmetic: the two disciplines whosemarriage had led to its birth.By an in depth reading of some details in the text of al Khwarizmi , we concluded that this mathematician intended to lay down the axiomatic foundations of that new discipline. His resort to arithmetical and geometrical means was a way of making his theory more accessible. He used them to justify the axioms: those that were not explicitly introduced per se, and those that were remained implicit. The paper also relies on some unedited writingsof al-Khwarizmi's successors, which could shedlight on the ways they used to consolidate the foundations of algebra and improve its methods. (author)

  20. Moessbauer studies on Al-Co ferrites

    Moessbauer spectroscopy studies have been performed on the spinel CoAlxFe2-xO4 (.2≤x≤1.7) in the temperature range 77-750 K using either a liquid nitrogen bath cryostat or a furnace. The samples are magnetic at 77 K giving spectra that have magnetic sextets coexisting with a central line which increases in population with the Al-content indicating relaxation effects. The data shows that Al possesses no preference to either tetrahedral or octahedral sites of the ferrite over the whole range of concentration. The Moessbauer hyperfine interaction parameters and magnetic transition temperatures were determined. As expected the hyperfine field and Curie temperature decrease when the Al-content increases. (orig.)

  1. Magnetic Properties of NdAl2

    Bak, P.

    1974-01-01

    The magnetic properties of NdAl2 are calculated using a Hamiltonian including crystal-field and isotropic exchange interaction terms. A two-dimensional mean-field theory is evaluated to calculate single-crystal magnetization curves. It is shown that the magnetic properties can be understood using...... the crystal-field parameters derived from the magnetic exciton spectrum measured by Houmann et al. by means of inelastic neutron scattering. The combined lambda -Schottky anomaly in the heat capacity is explained. No additional parameters are introduced.......The magnetic properties of NdAl2 are calculated using a Hamiltonian including crystal-field and isotropic exchange interaction terms. A two-dimensional mean-field theory is evaluated to calculate single-crystal magnetization curves. It is shown that the magnetic properties can be understood using...

  2. Autologous Stem Cell Transplant for AL Amyloidosis

    Vivek Roy

    2012-01-01

    Full Text Available AL amyloidosis is caused by clonal plasma cells that produce immunoglobulin light chains which misfold and get deposited as amyloid fibrils. Therapy directed against the plasma cell clone leads to clinical benefit. Melphalan and corticosteroids have been the mainstay of treatment for a number of years and the recent availability of other effective agents (IMiDs and proteasome inhibitors has increased treatment options. Autologous stem cell transplant (ASCT has been used in the treatment of AL amyloidosis for many years. It is associated with high rates of hematologic response and improvement in organ function. However, transplant carries considerable risks. Careful patient selection is important to minimize transplant related morbidity and mortality and ensure optimal patient outcomes. As newer more affective therapies become available the role and timing of ASCT in the overall treatment strategy of AL amyloidosis will need to be continually reassessed.

  3. Thermal Properties of Al-50%Si Alloys

    Akio Nishimoto; Katsuya Akamatsu; Kazuyoshi Nakao; Kazuo Ichii

    2004-01-01

    In order to prepare a hypereutectic Al-Si alloy with low coefficients of thermal expansion (CTE), Al-50was produced by powder metallurgy (P/M) and ingot metallurgy (I/M). P/M specimen was prepared by mechanical alloying(MA) and pulsed electric-current sintering (PECS). The microstructures of specimens were characterized by optical microscopy and scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS). Vickers microhardness and CTE measurements were performed. The grains in the P/M specimen were refined with increasing MA time. Primary Si and eutectic Si in the I/M specimen were remarkably refined by adding minute amounts of Sr. The CTE of P/M and I/M specimens were estimated as 7.8×10-6 and 10.7×10-6, respectively. These values were as same as a CTE of Al2O3 ceramics.

  4. Kritik Terhadap Pemikiran Tasawuf Al-Raniri

    Syaifan Nur

    2013-12-01

    Full Text Available Abstract : Al-Raniri is often positioned by some scholars as “superior” figure, which is contrasted to Hamzah Fansuri and Syamsuddin Sumaterani, and that is why they predicate him as one of pioneer of Islamic reformer in Malay- Indonesian archipelago. Anti-wujūdiyyah Sufism campaign by al-Raniri quite successful to some extent to amputate the rate of development of philosophical Sufism was brought by Fansuri and Sumaterani in the one hand, and strike off the nature of moral Sufism in the other, redeemed by bloodshed. This article discussed the “superiority” of al-Raniri’s thought of Sufism, viewed from a broader spectrum, either in relation to problems of faith or theology and politics surrounding the circumstance of his time.Keywords : Philosophical tasawuf, neo-sufism, panteism, tajalli, God’s attributeAbstrak : Al-Raniri oleh banyak kalangan seringkali diposisikan sebagai tokoh “superior” yang diperlawankan dengan Hamzah Fansuri dan Syamsuddin Sumaterani, dan itu sebabnya para ahli memberinya predikat sebagai seorang pelopor pembaru (mujaddid Islam di Nusantara. Anti tasawuf wujūdiyyah yang dikampanyekan oleh al-Raniri cukup berhasil mengamputasi laju perkembangan tasawuf falsafi yang dibawa oleh Fansuri dan Sumaterani di satu sisi, dan melancarkan laju corak tasawuf akhlaki di sisi lain, yang ditebus dengan cara pertumpahan darah. Tulisan ini mendiskusikan “superioritas” pemikiran tasawuf al-Raniri tersebut, dilihat dari spektrum yang lebih luas, baik menyangkut persoalan keyakinan atau teologi maupun politik yang mengitari situasi zamannya.Kata kunci : Tasawuf falsafi , neo-sufisme, panteisme, tajalli, sifat Tuhan

  5. Fabrication of Al-Al3Ti/Ti3Al Functionally Graded Materials under a Centrifugal Force

    Yoshimi Watanabe

    2010-09-01

    Full Text Available Fabrication of Al-Al3Ti functionally graded materials (FGMs under the centrifugal force has recently attracted some attention. The controlled compositional gradient of the fabricated FGMs, the low cost of the process, and the good mold filling, are the main advantages of the centrifugal method (CM. Using the conventional CM techniques such as the centrifugal solid-particle method and centrifugal in-situ method, FGMs rings with gradually distributed properties could be achieved. As a more practical choice, the centrifugal mixed-powder method (CMPM was recently proposed to obtain FGMs containing nano-particles selectively dispersed in the outer surface of the fabricated parts. However, if a control of the particles morphology, compound formulas or sizes, is desired, another CM technique is favored. As a development of CMPM, our novel reaction centrifugal mixed-powder method (RCMPM has been presented. Using RCMPM, Al‑Al3Ti/Ti3Al FGMs with good surface properties and temperature controlled compositional gradient could be achieved. In this short review, this novel method will be discussed in detail and the effect of RCMPM processing temperature on the reinforcement particles morphology, size and distribution through the fabricated samples, will be reviewed.

  6. Total energy, equation of state and bulk modulus of AlP, AlAs and AlSb semiconductors

    A R Jivani; H J Trivedi; P J Gajjar; A R Jani

    2005-01-01

    Recently proposed model potential which combines both linear and quadratic types of interactions is employed for the investigation of some properties like the total energy, equation of state and bulk modulus of AlP, AlAs and AlSb semiconductor compounds using higher-order perturbation theory. The model potential parameter is determined using zero pressure condition. The ratio of the covalent bonding term E cov to the second-order term 2 is 6.77% to 11.85% which shows that contribution from higher order terms are important for zinc-blende-type crystals. The calculated numerical results of the total energy, energy band gap at Jones-zone face and bulk modulus of these compounds are in good agreement with the experimental data and found much better than other such theoretical findings. We have also studied pressure–volume relations of these compounds. The present study is carried out using six different screening functions along with latest screening function proposed by Sarkar et al. It is found from the present study that effect of exchange and correlation is clearly distinguishable.

  7. Diffusion AlSi-MeCrAlY coatings obtained on intermetallic γ-TiAl phase

    M. Góral

    2012-12-01

    Full Text Available Purpose: The development of new protective coatings for TiAl intermetallics was conducted. The MeCrAlYAlSi slurry was used with different amount of aluminium-silicon powder in the binder.Design/methodology/approach: The slurry consisting of aluminium and silicon powder with the addition of MeCrAlY powder were used during the procedure. The inorganic solution made from chromic and phosphoric acid was applied as a binder. The preliminary research of microstructure of obtained coatings was conducted.Findings: The obtained coating consisting of 3 or 4 zones (depending on chemical composition of the slurry was obtained during the annealing process (950°C/4h.Research limitations/implications: The research results revealed the possibility of obtaining coatings with complex phase and chemical composition.Practical implications: Many problems connected with sedimentation of heavier MeCrAlY powder were observed.Originality/value: The copletele new technologies was described in article

  8. Melting, Processing, and Properties of Disordered Fe-Al and Fe-Al-C Based Alloys

    Satya Prasad, V. V.; Khaple, Shivkumar; Baligidad, R. G.

    2014-09-01

    This article presents a part of the research work conducted in our laboratory to develop lightweight steels based on Fe-Al alloys containing 7 wt.% and 9 wt.% aluminum for construction of advanced lightweight ground transportation systems, such as automotive vehicles and heavy-haul truck, and for civil engineering construction, such as bridges, tunnels, and buildings. The melting and casting of sound, porosity-free ingots of Fe-Al-based alloys was accomplished by a newly developed cost-effective technique. The technique consists of using a special flux cover and proprietary charging schedule during air induction melting. These alloys were also produced using a vacuum induction melting (VIM) process for comparison purposes. The effect of aluminum (7 wt.% and 9 wt.%) on melting, processing, and properties of disordered solid solution Fe-Al alloys has been studied in detail. Fe-7 wt.% Al alloy could be produced using air induction melting with a flux cover with the properties comparable to the alloy produced through the VIM route. This material could be further processed through hot and cold working to produce sheets and thin foils. The cold-rolled and annealed sheet exhibited excellent room-temperature ductility. The role of carbon in Fe-7 wt.% Al alloys has also been examined. The results indicate that Fe-Al and Fe-Al-C alloys containing about 7 wt.% Al are potential lightweight steels.

  9. Adhesion of metal carbide/nitride interfaces: Al/TiC and Al/TiN

    Liu, L. M.; Wang, S. Q.; Ye, H. Q.

    2003-12-01

    We employ density functional theory to investigate and compare Al/TiC and Al/TiN interfaces by electronic structures, relaxed atomic geometries and adhesions. The results show that the preferred bonding site is the interfacial Al atoms above the ceramic's metalloid atoms for both systems. The calculated adhesion energies are quantitatively in agreement with other calculated and experimental results of Al on the carbide and nitride. A detailed comparison of the adhesion energies and relaxed structures shows weaker bonding and less relaxation in the Al/nitride case, which is correlated with the lower surface energy of the ceramic. We have thoroughly characterized the electronic structure and determined that the polar covalent Al3sp-C(N)2s bonds constitute the primary interfacial bonding interaction. The larger overlapping bonding states at the Al/TiC interface reveal the reason why it exhibits relatively larger adhesion energy. Cleavage may take place preferentially at the interface, especially for the Al/TiN, which is in agreement with experimental results.

  10. Adhesion of metal-carbide/nitride interfaces: Al/TiC and Al/TiN

    We employ density functional theory to investigate and compare Al/TiC and Al/TiN interfaces by electronic structures, relaxed atomic geometries and adhesions. The results show that the preferred bonding site is the interfacial Al atoms above the ceramic's metalloid atoms for both systems. The calculated adhesion energies are quantitatively in agreement with other calculated and experimental results of Al on the carbide and nitride. A detailed comparison of the adhesion energies and relaxed structures shows weaker bonding and less relaxation in the Al/nitride case, which is correlated with the lower surface energy of the ceramic. We have thoroughly characterized the electronic structure and determined that the polar covalent Al3sp-C(N)2s bonds constitute the primary interfacial bonding interaction. The larger overlapping bonding states at the Al/TiC interface reveal the reason why it exhibits relatively larger adhesion energy. Cleavage may take place preferentially at the interface, especially for the Al/TiN, which is in agreement with experimental results

  11. InAlGaAs/AlGaAs quantum wells: line widths, transition energies and segregation

    Jensen, Jacob Riis; Hvam, Jørn Märcher; Langbein, Wolfgang

    2000-01-01

    We investigate the optical properties of InAlCaAs/AlGaAs quantum wells pseudomorphically grown on GaAs using molecular beam epitaxy (MBE). The transition energies, measured with photoluminescence (PL), are modelled solving the Schrodinger equation, and taking into account segregation in the group...

  12. Introducción al derecho

    Collado Luis, Santiago

    2012-01-01

    Manual de la asignatura introducción al derecho. Nivel educativo: Grado El origen de este texto –materiales docentes- que lleva por título “Introducción al Derecho” ha sido escrito respondiendo a una estricta necesidad docente y por tanto necesariamente pedagógica. En efecto, era totalmente necesario que los alumnos, del Grado de Administración y Dirección de Empresas y otras titulaciones no jurídicas, contasen con un texto para facilitar el estudio de las principales categorías conceptual...

  13. Quadrupole scattering in PrAl2

    Sablik, M. J.; Pureur, P.; Creuzet, G.; Fert, A.; Levy, P. M.

    1983-10-01

    We derive the spontaneous anisotropy of the resistivity of the ferromagnetic compound PrAl2 from magnetoresistance measurements on a single crystal of PrAl2. We ascribe this spontaneous anisotropy of the resistivity to scattering of the conduction electrons by the thermal quadrupole disorder and we account for our experimental results by using the theoretical model previously developed by us. We find that quadrupole scattering gives a very important contribution to the total magnetic disorder (spin and quadrupole) resistivity but that only a small part of this quadrupole contribution is anisotropic.

  14. Amyotrofisen lateraaliskleroosin (ALS) fysioterapia : Systemaattinen kirjallisuuskatsaus

    Finne, Ida

    2015-01-01

    Amyotrofinen lateraaliskleroosi eli ALS on harvinainen motoneuronisairaus, jonka ominaispiirteenä on selkäytimen, aivorungon ja aivokuoren motoneuroneiden etenevä degeneraatio ja tuhoutuminen. Tähän parantumattomaan sairauteen sairastuu Suomessa vuosittain noin 120–150 henkilöä. Keskimääräinen sairastumisikä on noin 60 vuotta ja elinikä diagnoosin saamisen jälkeen on noin 3 - 5 vuotta. Fysioterapia on tärkeä osa ALS-potilaan hoitoa ja kuntoutusta. Fysioterapian vaikutut-tavuutta on tästä ...

  15. Aspectos biopsicosociales asociados al embarazo adolescente

    Regina Cogollo Jiménez

    2012-01-01

    Introducción: El embarazo en la adolescencia, es un evento inesperado, sorpresivo. Este artículo establece la importancia de identificar los aspectos biopsicosociales asociados al embarazo adolescente en las embarazadas asistentes al programa de Control Prenatal de una Empresa Social del Estado de nivel 1 en Montería en 2009, para comprender las actitudes y los comportamientos asociados a esta etapa tan temprana. Materiales y Métodos: Es un estudio descriptivo, cuantitativo, de corte transver...

  16. Recent research highlights from the ALS OML

    Yashchuk, Valeriy V.

    2013-01-01

    The main mission of the Optical Metrology Laboratory (OML) at the Advanced Light Source (ALS) is to ensure state-of-the-art performance of beamline optics. New beamlines and instruments laid out in the ALS strategic plan as well as the plan for New Generation Light Source (NGLS) facility all involve increasingly complex optical systems that need ultra-high precision optics to achieve the specifications and goals of their state-of-the art research programs. In order to manufacture, measure, tu...

  17. The wobbler mouse, an ALS animal model

    Moser, Jakob Maximilian; Bigini, Paolo; Schmitt-John, Thomas

    2013-01-01

    This review article is focused on the research progress made utilizing the wobbler mouse as animal model for human motor neuron diseases, especially the amyotrophic lateral sclerosis (ALS). The wobbler mouse develops progressive degeneration of upper and lower motor neurons and shows striking...... disease mechanism and testing various therapeutic approaches and discuss the relevance of these advances for human ALS. The identification of the causative mutation linking the wobbler mutation to a vesicle transport factor and the research focussed on the cellular basis and the therapeutic treatment of...

  18. The ALS Storage Ring RF System

    The ALS Storage Ring RF System is characterized by the use of the following features: (1) High power loading of two single cell cavities. (2) The use of a tubular ceramic input window employing aperture coupling. (3) The use of waveguide filters and matchers designed for HOM absorption. (4) A comprehensive HOM monitoring system. (5) The use of waveguide water-wedge loads for the magic tee and circulator loads. The results of cavity measurements and high power tests are reported together with the performance of the system during the commissioning and operation phases of the ALS project. Plans for future window development are discussed

  19. Al-Yawahir Al-Saniyya Fi Sarh-Al-Yarrumiyya, de Al-Ta c Alibi (s.VII-XIV)

    Bellachehab, Ahmed

    1994-01-01

    Edición critica, realizada sobre varios manuscritos, de una interesante fuente gramatical magrebi, del siglo VIII de la hégira XIV de nuestra era. Estudio sobre el autor, at-ta alibi, típico gramático tardío del norte de África, y estudio sobre su producción escrita, en general y en concreto sobre este al-yawahir al-saniyya que es un interesante comentario de la celebre yarrumiyya, comentario hasta hoy inédito que representa un hito en la tradición de estudios gramaticales del occidente islám...

  20. Metamagnetism in Ce(Ga,Al)2

    K G Suresh; S Radha; A K Nigam

    2002-05-01

    Effect of Al substitution on the magnetic properties of Ce(Ga1-Al)2 ( = 0, 0.1 and 0.5) system has been studied. The magnetic state of CeGa2 is found to be FM with a C of 8 K, whereas the compounds with =0.1 and 0.5 are AFM and possess N of about 9 K. These two compounds undergo metamagnetic transition and the critical fields are about 1.2 T and 0.5 T, respectively at 2 K. These variations are explained on the basis of helical spin structure in these compounds.

  1. Periodistas: el acceso al mercado laboral

    2006-01-01

    El presente estudio analiza la situación profesional de los Licenciados en Periodismo en España. Para ello esta investigación sigue la lógica del proceso de acceso al mercado laboral, es decir, se estudia, en primer lugar, la oferta de egresados y las demandas del sector; a continuación, se analiza la forma en la que un titulado en la Licenciatura de Periodismo accede al mercado laboral y el tiempo que tarda en hacerlo; y por último, se examinan los medios de comunicación en lo...

  2. Surface phonon polariton characteristics of In(0.04)Al(0.06)Ga(0.90)N/AlN/Al(2)O(3) heterostructure.

    Ng, S S; Lee, S C; Bakhori, S K Mohd; Hassan, Z; Abu Hassan, H; Yakovlev, V A; Novikova, N N; Vinogradov, E A

    2010-05-10

    Surface phonon polariton (SPP) characteristics of In(0.04)Al(0.06)Ga(0.90)N/AlN/Al(2)O(3) heterostructure are investigated by means of p-polarized infrared (IR) attenuated total reflection spectroscopy. Two absorption dips corresponding to In(0.04)Al(0.06)Ga(0.90)N SPP modes are observed. In addition, two prominent dips and one relatively weak and broad dip corresponding to the Al(2)O(3) SPP mode, In(0.04)Al(0.06)Ga(0.90)N/Al(2)O(3) interface mode, and Al(2)O(3) bulk polariton mode, respectively, are clearly seen. No surface mode feature originating from the AlN layer is observed because it is too thin. Overall, the observations are in good agreement with the theoretical predictions. PMID:20588890

  3. Microstructural defects modeling in the Al-Mo system

    In this work we have utilized computer simulation techniques to study microstructural defects, such as point defects and interfaces, in the Al-Mo alloy. Such alloy is taken as a model to study the Al(fcc)/U-Mo(bcc) interface. The EAM interatomic potential used has been fitted to the formation energy and lattice constant of the AlMo3 intermetallic. Formation of vacancies for both components Al and Mo and anti-sites, AlMo and MoAl, as well as vacancy migration was studied in this structure. We found that the lowest energy defect complex that preserves stoichiometry is the antisite pair AlMo+MoAl, in correspondence with other intermetallics of the same structure. Our results also suggest that the structure of the Al(fcc)/Mo(bcc) interface is unstable, while that of the Al(fcc)/Al5Mo interface is stable, as observed experimentally. (author)

  4. Liquidus temperatures of Na3AlF6-AlF3-CaF2-KF-LiF-Al2O3 melts

    Peng J.P.

    2014-01-01

    Full Text Available Temperatures for the primary crystallization of Na3AlF6-AlF3-CaF2-KF-LiF-Al2O3 system adopted in aluminum electrolysis process were determined by thermal analysis. An empirical equation was derived to describe the liquidus temperatures for the primary crystallization of this multicomponent electrolyte system: t/℃=1011 + 0.7w(AlF3 - 0.232w(AlF32 - 7.65w(Al2O3 + 0.523w(Al2O32 - 8.96w(LiF + 0.043w(LiF2 - 3.32w(KF - 0.12w(KF2 - 3.28w(CaF2 +0.037w(CaF22 + 0.091w(AlF3w(LiF + 0.074w(AlF3w(KF + 0.084w(AlF3w(CaF2 - 0.27w(Al2O3w(LiF, where w(AlF3 denotes the mass fraction of excess aluminum fluoride with respect to cryolite. While w(Al2O3 ranges from 2% to 4%, w(LiF, w(KF and w(CaF2 from 0 to 7%, and the molar ratio of NaF/AlF3 from 2.2 to 3.

  5. An impedance study of complex Al/Cu-Al{sub 2}O{sub 3} electrode

    Denisova, J; Katkevics, J; Viksna, A [Faculty of Chemistry, University of Latvia, Kr. Valdemara Str. 48, Riga, LV-1013 (Latvia); Erts, D, E-mail: arturs.viksna@lu.lv [Institute of Chemical Physics, University of Latvia, Kronvalda blvd. 4, Riga, LV-1586 (Latvia)

    2011-06-23

    Electrochemical impedance spectroscopy (EIS) was used to investigate different Cu deposition regimes on Al surface obtained by internal electrolysis and to characterize properties of fabricated electrodes. EIS experimental data confirmed that Cu deposition by internal electrolysis is realized and the complex electrode system is obtained. The main difficulty in preparation of Al/Cu electrodes is to prevent aluminium oxidation before and during electrochemical deposition of Cu particles. In this work NaCl, CH{sub 3}COONa, K{sub 2}SO{sub 4}, mono- and diammonium citrate electrolytes were examined to determine their suitability for impedance measurements. Al/Cu-Al{sub 2}O{sub 3} electrode composition was approved by equivalent circuit analysis, optical and scanning electron microscope methods. The most optimal Cu deposition mode using internal electrolysis was determined. The obtained results are promising for future electrochemical fabrication of nanostructures directly on Al surfaces by internal electrolysis.

  6. FABRICATION OF Al/Al2O3 FGM ROTATING DISC

    A. B. Sanuddin

    2012-06-01

    Full Text Available This study presents a method of fabricating a disc made of Al/Al2O3 functionally graded materials (FGM, using a powder metallurgy manufacturing process. The aim is to develop a processing method for a rotating disc made of FGM, by stacking the slurry, layer by layer in a radial direction. A three-layer functionally graded material of Al/Al2O3 is fabricated with compositions of 10, 20, 30 vol.% Al2O3. The ceramic composition increases from the discs inner (centre to the outer. The combination of these materials can offer the ability to withstand high temperature conditions whilst maintaining strength in extreme environments.

  7. In situ microscopy of rapidly heated nano-Al and nano-Al/WO3 thermites

    Sullivan, Kyle T.; Chiou, Wen-An; Fiore, Richard; Zachariah, Michael R.

    2010-09-01

    The initiation and reaction mechanism of nano-Al and nano-Al thermites in rapid heating environments is investigated in this work. A semiconductor-based grid/stage was used, capable of in situ heating of a sample from room temperature to 1473 K, and at a rate of 106 K/s, inside an electron microscope. Nano-Al was rapidly heated in a transmission electron microscope, and before and after images indicate that the aluminum migrates through the shell, consistent with a diffusion-based mechanism. A nano-Al/WO3 composite was then heated in a scanning electron microscope. The results indicate that a reactive sintering mechanism is occurring for the nano-Al/WO3 thermite, as the products are found to be in surface contact and significantly deformed after the heating pulse.

  8. Serious Flaws in Korf et al.'s Analysis on Time Complexity of A*

    Dinh, Hang

    2008-01-01

    Understanding the effect of a heuristic on the time complexity of the well-known A* search algorithm has been a subject of a large research body in AI. Among those researches is Korf et al.'s analysis (Korf & Reid, 1998; Korf et al., 2001; Korf, 2000a; Korf, 2000b), which concluded that the effect of a heuristic is to reduce the effective depth rather than effective branching factor. Since this conclusion conflicts with both previous analysis and recent analysis by other authors, we try to investigate the causes of such contradictions and finally find out that Korf et al.'s analysis has many serious flaws from which their main conclusion was drawn.

  9. Tensile deformation behavior of a sub-micrometer Al2O3/6061Al composite

    A 0.3 μm Al2O3/6061Al composite with 33% volume fraction of Al2O3 was fabricated by the patented squeeze-casting technology. The tensile properties were studied, and the dynamic tensile deformation behavior was investigated by an in situ TEM tensile technique. The as-cast composite exhibits excellent tensile properties with a fracture strength of 504 MPa, and the strength increases to 579 MPa after a T6 treatment. The high strength is mainly attributed to the dispersion strengthening effect of the finer sub-micrometer Al2O3 particles. Dynamic transmission electron microscopy indicates that micro-cracks initiate and propagate mainly in the matrix. The Al2O3 particles can hinder the growth and deflect the cracks, but the resistance of the particles to crack propagation is small. The propagation stage is accordingly short, leading to the fracture of the composite

  10. Different magnetic behaviour of the Kondo compounds Al3Ce and Al11Ce3

    Neutron diffraction experiments on the Al3Ce and Al11Ce3 compounds have been performed on the multidetector of the I.L.L. high flux reactor. No magnetic structure has been detected on the Al3Ce compound down to 20 mK. This confirms the non magnetic ground state of Al3Ce. For Al11Ce3, two magnetic structures have been observed: a ferromagnetic one at 4.2 K and an antiferromagnetic one at 2 K. The antiferromagnetic structure, which corresponds to a propagation vector (0,0,1/3), implies a strong reduction of the magnetic moment of determined sites; this reflects the Kondo character of the compounds

  11. InAlGaAs/AlGaAs quantum wells: line widths, transition energies and segregation

    Jensen, Jacob Riis; Hvam, Jørn Märcher; Langbein, Wolfgang

    We investigate the optical properties of InAlCaAs/AlGaAs quantum wells pseudomorphically grown on GaAs using molecular beam epitaxy (MBE). The transition energies, measured with photoluminescence (PL), are modelled solving the Schrodinger equation, and taking into account segregation in the group...... III sublattice. From a fit to the transition energies, an empirical band gap relation for InAlGaAs is found, in the composition range relevant for growth on GaAs. The PL lines at low temperature (T = 10 K) are broadened due to random alloy fluctuations and an interface roughness of 1.1 monolayers....... Finally, the use of InAlGaAs/AlGaAs quantum wells for making strained T-shaped quantum wires is demonstrated. (C) 2000 Elsevier Science B.V. All rights reserved....

  12. Effect of stress on the Al composition evolution in AlGaN grown using metal organic vapor phase epitaxy

    He, Chenguang; Qin, Zhixin; Xu, Fujun; Zhang, Lisheng; Wang, Jiaming; Hou, Mengjun; Zhang, Shan; Wang, Xinqiang; Ge, Weikun; Shen, Bo

    2016-05-01

    Two series of AlGaN samples with different stresses were designed to investigate the effect of stress on the Al composition. X-ray diffraction reciprocal space mapping (XRD RSM) demonstrated that the AlGaN epilayers with different stresses have large Al composition differences despite the same growth conditions. The largest Al composition difference reached up to 21.3%, which was also confirmed using secondary ion mass spectroscopy (SIMS). This result is attributed to a large stress discrepancy in the AlGaN epilayers. Finally, the dependences of the solid-phase Al composition on the gas-phase Al composition under different stresses were systematically analyzed.

  13. The constitution of alloys in the Al-rich corner of the Al-Si-Sm ternary system

    The constitution of alloys and the liquidus surface in the Al-rich corner of the Al-Si-Sm ternary system were determined by the examination of controlled heated and cooled specimens, as well as heat-treated specimens by means of optical and scanning electron microscopy, energy-dispersive X-ray spectroscopy, differential thermal analysis and X-ray diffraction. The Al-rich corner of the Al-Si-Sm ternary system comprises five regions of primary crystallisation (αAl, βSi, Al3Sm, Al2Si2Sm and AlSiSm) with following characteristic invariant reaction sequences: ternary eutectic reaction L → αAl + βSi + Al2Si2Sm, and two liquidus transition reactions, i. e., L + Al3Sm → αAl + AlSiSm, and L + AlSiSm → αAl + Al2Si2Sm. Along with the position of ternary eutectic and both interstitial points in the Al-rich corner of the Al-Si-Sm ternary system, the temperatures for each reaction were determined. (orig.)

  14. Microscopic phase field study of the antisite defect of Ni3 Al in binary Ni-Al alloys

    2010-01-01

    The temporal evolution feature of a microscopic phase field model is utilized to study the antisite defects of L1 2-Ni 3 Al;this is quite different from other physicist’ interests.There are mainly two points in brief.Firstly,antisite defects Ni Al and Al Ni ,which are caused by the deviation from the stoichiometric Ni 3 Al,coexist in the Ni 3 Al phase.The surplus Ni atom in the Ni-rich side is prone to substitute Al thus producing the antisite defect Ni Al that maintains the stability of the L1 2 structure.In other case,the surplus Al atom in the Al-rich side is accommodated by a Ni sublattice consequently giving rise to antisite defect Al Ni .The calculated equilibrium occupancy probability of Ni Al is much higher than that of Al Ni .This point is generally in line with other theoretical and experimental works.Additionally,both Ni Al and Al Ni have a strong negative correlation to time step during the disorder-order transformation.Since the initial value of Ni Al and Al Ni on each site of the matrix is right at the concentration that we set,we can observe the decrease process of Ni Al and Al Ni from the initial disordered high anti-structure state to their respective equilibrium state,i.e.to the result of the ordering process further coarsening.

  15. The modulation structure induced changes in mechanical properties of TiAlN/Al2O3 multilayers

    TiAlN/Al2O3 multilayers which had different separate layer thickness of TiAlN or Al2O3 were synthesized by sputtering Ti3Al and Al2O3 targets with N2 and Ar gases. The influence of modulation periods and modulation ratios on structure and properties of TiAlN/Al2O3 multilayers was investigated using scanning electron microscopy, X-ray diffraction, X-ray Photoelectron Spectroscopy, surface profiler, and nanoindenter. Compared to TiAlN layer with only (2 0 0) preferred orientation, TiAlN/Al2O3 multilayers were crystallized with orientations in the TiAlN (1 1 1), TiAlN (2 2 2) and AlN (1 0 0). Besides, weak Al2O3 (0 2 2) orientation is observed, when modulation period is 8.9 nm. The maximum hardness about 36.6 GPa was obtained at modulation period of 10.4 nm and modulation ratio of 10:1. The hardness and the toughness of TiAlN/Al2O3 multilayers increase as individual TiAlN layer thickness increases

  16. Wear characteristics of Al-AlN composites produced in-situ by nitrogenation

    Pradhan, S.; Jena, S. K.; Patnaik, S. C.; Swain, P. K.; Majhi, J.

    2015-02-01

    In the present scenario most of the parts used in automobile and aerospace industries are made of composites. Aluminium metal has a very high strength to weight ratio. Al-AlN metal matrix composites have excellent mechanical properties like good wear resistance, high hardness and high strength to weight ratio which are obtained from low density of aluminium and high hardness and wear resistance of AlN. Therefore, use of Al-AlN MMC leads to advantages in automobile industries as it reduces fuel consumption and gives better structural strength. The composites can be produced ex-situ by introducing AlN as reinforcement into the metal matrix and in- situ by nitrogenation process. In the present process Al-AlN composites were fabricated by treating molten aluminium with a mixture of CaO and NH4Cl and held at temperature range at 750-930°C and then cast into a metal mould. Addition of CaO to NH4Cl is found to have a more pronounced effect as a nitrogenation agent in comparison with NH4Cl in the molten aluminium in the temperature range of 700- 1000°C. Castings of aluminium and Al-AlN composites were prepared by mixing different ratios of aluminium and NH4Cl, at different casting temperatures and holding time. Wear resistance and hardness of the samples were determined, and microstructure studies were carried out. The composite formed using higher amount of NH4Cl had higher hardness and wear resistance.

  17. AlON的合成工艺%Synthesis technology of AlON

    王习东; 李文超

    2001-01-01

    分析了合成AlON的各种方法。 用模式识别结 合神经网络对碳热还原氮化合成AlON工艺 进行了优化, 利用模式逆映射得到了理想的合成工艺参数。 对AlON体系进行了热力学初步 分析, 计算了温度为2  073  K时合成AlON的热力学参数状态图。 根据热力学参数状态图所确定的条件, 热压合成了AlON陶瓷。 对所合成的AlON试样进行了 X 射线衍射标定及部分物理性能的测定。 其密度为3.63  g/cm3, 约为其理论 密度的97.8%。%The synthesis technolog y of AlON ceramics was investigated. The program o f pattern recognition was used to optimize the parameters of AlON synthesi s process, and the proper parameters were obtained by inverse projection. The th ermodynamic properties of AlON were preliminary analyzed and estimate d, phase stability diagrams at 2  073  K were calculated. A lON ceramics was synthesized by hot-press sintering under the conditions given by phase stability diagram. The density of AlON is 3.63  g/cm3, about 97.8% of its th eoretic d ensity.

  18. Microstructure of Ni-Al powder and Ni-Al composite coatings prepared by twin-wire arc spraying

    Wang, Ji-xiao; Wang, Gui-xian; Liu, Jing-shun; Zhang, Lun-yong; Wang, Wei; Li, Ze; Wang, Qi-xiang; Sun, Jian-fei

    2016-07-01

    Ni-Al powder and Ni-Al composite coatings were fabricated by twin-wire arc spraying (TWAS). The microstructures of Ni-5wt%Al powder and Ni-20wt%Al powder were characterized by scanning electronic microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that the obtained particle size ranged from 5 to 50 μm. The morphology of the Ni-Al powder showed that molten particles were composed of Ni solid solution, NiAl, Ni3Al, Al2O3, and NiO. The Ni-Al phase and a small amount of Al2O3 particles changed the composition of the coating. The microstructures of the twin-wire-arc-sprayed Ni-Al composite coatings were characterized by SEM, EDS, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that the main phase of the Ni-5wt%Al coating consisted of Ni solid solution and NiAl in addition to a small amount of Al2O3. The main phase of the Ni-20wt%Al coating mainly consisted of Ni solid solution, NiAl, and Ni3Al in addition to a small amount of Al and Al2O3, and NiAl and Ni3Al intermetallic compounds effectively further improved the final wear property of the coatings. TEM analysis indicated that fine spherical NiAl3 precipitates and a Ni-Al-O amorphous phase formed in the matrix of the Ni solid solution in the original state.

  19. Study of the 27Al(n,2,)26Al reaction via accelerator mass spectrometry

    The excitation function for the 27Al(n,2n)26Al reaction is expected to show a strongly non-linear behavior in the neutron-energy region around 14 MeV, the neutron energy in D-T plasmas; thus the production rate of 26Al (t1/2=7.2*105 a) in D-T fusion environments can in principle be used to measure the temperature of such plasmas. Existing measurements, however, are strongly discordant. Therefore, a new accurate measurement of the 27Al(n,2n)26Al cross sections in the near threshold region (En=13.5-14.8 MeV) was performed with the goal to achieve relative cross sections with the highest accuracy possible. In addition, the measurements were also designed to provide good absolute cross-section values, as absolute cross sections are important for radioactive waste predictions. Samples of Al metal were irradiated with neutrons in the energy range near threshold (Eth=13.55 MeV) at the Radiuminstitutes of both Vienna and St. Petersburg, and in Tokai-mura, Japan. In Tuebingen irradiations with neutrons of higher energies (17 and 19 MeV) were performed. The amount of 26Al produced during the irradiations was measured via accelerator mass spectrometry (AMS) at the Vienna Environmental Research Accelerator (VERA). This work represents the first 26Al measurements for this new facility. With this system, a background as low as 3*10-15 for 26Al/27Al isotope ratios was obtained, corresponding to a (n,2n) cross section of 0.04 mb. Utilizing AMS, cross sections with much higher precision and considerably closer to the threshold than in previous investigations could be measured. The prerequisite for its application as a temperature monitor, namely a very well known shape of the excitation function was met. A quantitative prediction of the sensitivity of this method for monitoring the temperature in a D-T fusion plasma was therefore possible. For thermal plasmas temperature changes in the order of 5 to 15 % should be detectable. An even higher sensitivity was found for non

  20. Management of respiratory symptoms in ALS.

    Hardiman, Orla

    2011-03-01

    Respiratory insufficiency is a frequent feature of ALS and is present in almost all cases at some stage of the illness. It is the commonest cause of death in ALS. FVC is used as important endpoint in many clinical trials, and in decision-making events for patients with ALS, although there are limitations to its predictive utility. There are multiple causes of respiratory muscle failure, all of which act to produce a progressive decline in pulmonary function. Diaphragmatic fatigue and weakness, coupled with respiratory muscle weakness, lead to reduced lung compliance and atelectasis. Increased secretions increase the risk of aspiration pneumonia, which further compromises respiratory function. Bulbar dysfunction can lead to nutritional deficiency, which in turn increases the fatigue of respiratory muscles. Early recognition of respiratory decline and symptomatic intervention, including non-invasive ventilation can significantly enhance both quality of life and life expectancy in ALS. Patients with respiratory failure should be advised to consider an advance directive to avoid emergency mechanical ventilation.

  1. Al/Cl2 molten salt battery

    Giner, J.

    1972-01-01

    Molten salt battery has been developed with theoretical energy density of 5.2 j/kg (650 W-h/lb). Battery, which operates at 150 C, can be used in primary mode or as rechargeable battery. Battery has aluminum anode and chlorine cathode. Electrolyte is mixture of AlCl3, NaCl, and some alkali metal halide such as KCl.

  2. 75 FR 1420 - Alabama Disaster # AL-00025

    2010-01-11

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00025 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a notice of an Administrative declaration of a disaster for the State of Alabama dated...

  3. 76 FR 29810 - Alabama Disaster #AL-00037

    2011-05-23

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00037 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for Public Assistance Only for...

  4. 75 FR 26813 - Alabama Disaster #AL-00029

    2010-05-12

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00029 AGENCY: Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for the State of Alabama...

  5. 78 FR 4967 - Alabama Disaster #AL-00046

    2013-01-23

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00046 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a notice of an Administrative declaration of a disaster for the State of ALABAMA dated...

  6. 76 FR 62481 - Incapital LLC, et al.

    2011-10-07

    ... From the Federal Register Online via the Government Publishing Office SECURITIES AND EXCHANGE COMMISSION Incapital LLC, et al.; Notice of Application September 30, 2011. AGENCY: Securities and Exchange Commission (``Commission''). ACTION: Notice of application for an order under section 12(d)(1)(J) of...

  7. 78 FR 22361 - Alabama Disaster #AL-00049

    2013-04-15

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00049 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a notice of an Administrative declaration of a disaster for the State of Alabama dated...

  8. 78 FR 26100 - Alabama Disaster #AL-00050

    2013-05-03

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00050 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a notice of an Administrative declaration of a disaster for the State of Alabama dated...

  9. 75 FR 3895 - Yale University, et al.;

    2010-01-25

    ... notice at 74 FR 67851, December 21, 2009. Docket Number: 09-065. Applicant: U.S. Department of Homeland..., Quanta 200 FEG. Manufacturer: FEI Company, Czech Republic. Intended Use: See notice at 74 FR 67851... International Trade Administration Yale University, et al.; Notice of Consolidated Decision on Applications...

  10. 77 FR 7227 - Alabama Disaster #AL-00040

    2012-02-10

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00040 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for the State of Alabama...

  11. 75 FR 474 - Alabama Disaster #AL-00026

    2010-01-05

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00026 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for Public Assistance Only for...

  12. 76 FR 27141 - Alabama Disaster # AL-00036

    2011-05-10

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00036 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for the State of Alabama...

  13. 77 FR 60003 - Alabama Disaster #AL-00044

    2012-10-01

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00044 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for Public Assistance Only for...

  14. 75 FR 26814 - Alabama Disaster #AL-00031

    2010-05-12

    ... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster AL-00031 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for Public Assistance Only for...

  15. Casting of particulate Al-base composites

    Moustafa, S.F. [CMRDI, Cairo (Egypt)

    1997-03-01

    A molten Al-4 wt.% Cu as well as a Al-13 wt.% Si alloy have been mixed mechanically with particulate of SiC, Al{sub 2}O{sub 3}, or graphite. After the completion of mixing, each mixture was poured into a permanent mould to solidify. To overcome the problem of non-wettability that exists between the investigated particulate and the molten aluminum alloys the particulate was chemically treated by impregnation in a solution containing Na{sup +} ions. The loading of SiC or Al{sub 2}O{sub 3} particulate in the produced composites can be as high as 40 wt.%, and for graphite particles it can be 20 wt.%. The mixing time required to introduce and distribute the investigated particles into the molten matrix was as low as five minutes to recluce chemical reactions at the interfaces between them. Processing details and parameters controlling this technique are described. Metallographic examinations as well as tensile tests were carried out to characterize the microstructure, the distribution of the particles and the strength of these composites. The results display that the composites made by this technique have good microstructure and tensile properties. (orig.)

  16. Synthesis of Ti-Al porous perform

    K. Naplocha

    2008-02-01

    Full Text Available Purpose: Article describes production method of intermetallic porous perform for reinforcing of composite materials. Usefulness of the high temperature self-propagating synthesis (SHS, with appropriate modification, to produce perform for production of composite was evaluated.Design/methodology/approach: Mixture of aluminum and titanium powder was cold isostatically pressed (CIPed and produced cylindrical pill was ignited in microwave field. Obtained structure usually have open porosity what enables for pressure infiltration with molten metal. The investigations of the structure of preforms on the scanning electron microscope (SEM were made.Findings: The produced performs in most cases reveal open porosity, uniform morphology and are suitable for infiltration process. After reaction Al-Ti compounds form partly globular structure with microhardness much higher than substratesResearch limitations/implications: In the actual stages of this work proposed method can be used for manufacturing of porous performs, which mainly contain Al3Ti. During reaction, mixture compacts with the molar ratio of Al/Ti=1 were transformed into inhomogeneous structure.Practical implications: Obtained perform can be widely used as the reinforcement to produce hybrid composite materials by the infiltration method. Aluminum casting alloys can be locally reinforced to improve hardness and resistance to oxidization at high temperature.Originality/value: Article is valuable for persons engaged in production of casting composite materials reinforced with porous perform. Proposed method allows to incorporate hard structures from Al-Ti compounds into aluminum casting.

  17. Cathodic electrochemiluminescence at double barrier Al/Al{sub 2}O{sub 3}/Al/Al{sub 2}O{sub 3} tunnel emission electrodes

    Hakansson, Markus [Laboratory of Analytical and Inorganic Chemistry, Helsinki University of Technology, P.O. Box 6100, FIN-02015 HUT (Finland); Jiang, Qinghong [Laboratory of Analytical and Inorganic Chemistry, Helsinki University of Technology, P.O. Box 6100, FIN-02015 HUT (Finland); Suomi, Johanna [Laboratory of Analytical and Inorganic Chemistry, Helsinki University of Technology, P.O. Box 6100, FIN-02015 HUT (Finland); Loikas, Kari [Workshop, Department of Chemistry, University of Turku, FIN-20014 (Finland); Nauma, Mauri [Workshop, Department of Chemistry, University of Turku, FIN-20014 (Finland); Ala-Kleme, Timo [Laboratory of Analytical Chemistry, Department of Chemistry, University of Turku, FIN-20014 (Finland); Kankare, Jouko [Laboratory of Analytical Chemistry, Department of Chemistry, University of Turku, FIN-20014 (Finland); Juhala, Pentti [Laboratory of Analytical Chemistry, Department of Chemistry, University of Turku, FIN-20014 (Finland); Eskola, Jarkko U. [Labmaster Oy, P.O. Box 71, FIN-20521 Turku (Finland); Kulmala, Sakari [Laboratory of Analytical and Inorganic Chemistry, Helsinki University of Technology, P.O. Box 6100, FIN-02015 HUT (Finland)

    2006-01-25

    Double insulating barrier tunnel emission electrodes were fabricated by adding a new pure aluminum layer upon oxidized aluminum electrodes by vacuum evaporation and thermally oxidizing the new aluminum layer in air at room temperature. Resulting Al/Al{sub 2}O{sub 3}/Al/Al{sub 2}O{sub 3} electrodes allow the use of various aluminum alloys in the electrode body necessary for hardness or shaping ability of the electrode while obtaining the luminescence properties of pure aluminum oxide. During electrical excitation of luminescent labels by cathodic hot electron injection into aqueous electrolyte solution, the background noise is mainly based on high-field-induced solid-state electroluminescence and F-center luminescence of the outer aluminum oxide film. The more defect states and/or impurity centers the outer oxide film contains, the higher is the background emission intensity. The present electrode fabrication method provides a considerable improvement in signal-to-noise ratio for time-resolved electrochemiluminescence (TR-ECL) measurements when the original native oxide film of the electrode body contains luminescence centers displaying long-lived luminescence. The excellent performance of the present electrodes is demonstrated by extremely low-level detection of Tb(III) chelates, luminol, Pt(II) coproporphyrin and Tb(III) labels in an immunometric immunoassay by time-resolved electrochemiluminescence.

  18. CALCULUL CINETOSTATIC AL MECANISMELOR PLANETARE CILINDRICE

    Păun ANTONESCU

    2012-05-01

    Full Text Available În lucrare se prezintă o metodă analitică pentru calculul cinetostatic al mecanismului planetarmonomobil cu două roţi dinţate centrale. Se consideră mai întâi cazul general al schemelor cinematice cu douăroţi dinţate solidare tip satelit, în două variante practice (multiplicator şi reductor de turaţie. Este menţionatcazul particular al mecanismelor planetare cu o singură roată satelit cu angrenare dublă (exterioară şiinterioară. Pe baza modelului de analiză cinetostatică a mecanismului planetar monomobil cu două roţi dinţatecentrale, în finalul lucrării se abordează o problemă practică de calcul cinetostatic al unui mecanism planetarcilindric simplu folosit la capul de frezat pentru prelucrarea roţilor dinţate cilindrice cu dinţi curbi înhipocicloidă.

  19. Cryptanalysis on Cheng et al. protocol

    Thakur, Tejeshwari

    2016-06-01

    Deployment of new node in any wireless sensor network is a sensitive task. This is the reason why, an Access Control Protocol is required in WSN. In this paper, we demonstrate that Access Control Protocol proposed by Cheng et al.[1] for Wireless Sensor Network is insecure. The reason is that this protocol fails to resist the active attack.

  20. Del desarrollo rural al desarrollo territorial

    Moyano Estrada, Eduardo

    2010-01-01

    5 páginas.-- Trabajo presentado al Seminario Ruraland celebrado en Antequera (Málaga) el 26 de mayo de 2010.-- Presentado como ponencia a la Jornada de debate "El desarrollo rural en la U.E. despues de 2013" celebrado en Aracena (Huelva) el 10 de junio de 2010 (adjuntado Pdf).

  1. Electron impact exctation of Al X

    Aggarwal, Kanti; Keenan, Francis

    2013-05-01

    Emission lines of Al ions, including Al X, are important for the modeling and diagnostics of lasing, fusion and astrophysical plasmas, for which atomic data are required for a variety of parameters, such as energy levels, radiative rates (A- values), and excitation rates or equivalently the effective collision strengths (Υ), which are obtained from the electron impact collision strengths (Ω). Experimentally, energy levels are available for Al X on the NIST website, but there is paucity for accurate collisional atomic data. Therefore, here we report a complete set of results (namely energy levels, radiative rates, and effective collision strengths) for all transitions among the lowest 98 levels of Al X. These levels belong to the (1s2) 2s2, 2s2p, 2p2, 2s3 l, 2p3 l, 2s4 l, and 2p4 l configurations. Finally, we also report the A- values for four types of transitions, namely electric dipole (E1), electric quadrupole (E2), magnetic dipole (M1), and magnetic quadrupole (M2), because these are also required for plasma modeling. For our calculations of wavefunctions, we have adopted the fully relativistic GRASP code, and for the calculations of Ω, the Dirac atomic R-matrix code (DARC) of PH Norrington and IP Grant. Additionally, parallel ca

  2. The Science of al-Biruni

    Sparavigna, Amelia Carolina

    2013-01-01

    Al-Biruni (973-1048) was one of the greatest scientists of all times. He was an astronomer, mathematician and philosopher, and studied physics and natural sciences. In this paper, we will discuss some of his experimental methods and some instruments he used.

  3. Thermoluminescence of LaAlO3

    In this paper the thermoluminescent properties of doped lanthanum aluminate (LaAlO3) with dysprosium ion (Dy) were studied. The thermoluminescence characteristics in the samples were obtained using an ultraviolet radiation of 220 nm. The LaAlO3:Dy samples were prepared by the modified Pechini method (Spray Dryer). The structural and morphological characterization was obtained by X-ray diffraction (XRD) and scanning electron microscopy (Sem) techniques respectively. The size particle composing the agglomerate was determined by Sem, agglomerated particles composed size of 2μm were observed. The thermoluminescence response of LaAlO3:Dy was compared with that obtained with the undoped sample. Thermoluminescence brightness curves of LaAlO3:Dy showed a peak centered at 185 grades C. Sensitivity of doped sample was greater, about 100 times compared with the undoped sample. Thermoluminescence response in function of the wavelength showed a maximum at 220 nm. Also the fading in thermoluminescence response was studied. (Author)

  4. Management of respiratory symptoms in ALS.

    Hardiman, Orla

    2012-02-01

    Respiratory insufficiency is a frequent feature of ALS and is present in almost all cases at some stage of the illness. It is the commonest cause of death in ALS. FVC is used as important endpoint in many clinical trials, and in decision-making events for patients with ALS, although there are limitations to its predictive utility. There are multiple causes of respiratory muscle failure, all of which act to produce a progressive decline in pulmonary function. Diaphragmatic fatigue and weakness, coupled with respiratory muscle weakness, lead to reduced lung compliance and atelectasis. Increased secretions increase the risk of aspiration pneumonia, which further compromises respiratory function. Bulbar dysfunction can lead to nutritional deficiency, which in turn increases the fatigue of respiratory muscles. Early recognition of respiratory decline and symptomatic intervention, including non-invasive ventilation can significantly enhance both quality of life and life expectancy in ALS. Patients with respiratory failure should be advised to consider an advance directive to avoid emergency mechanical ventilation.

  5. Al-Ghazali on Moral Education

    Alavi, Hamid Reza

    2007-01-01

    Al-Ghazali (1058-1111 CE) is probably the most influential scholar, philosopher, theologian, legal expert, religious reformer and mystic in the history of Islam. Although he wrote extensively about education, and particularly about moral education, this writing is scattered through a number of different works and has received less scholarly…

  6. Aluminum matrix texture in Al-Al3Ti functionally graded materials analyzed by electron back-scattering diffraction

    Watanabe, Yoshimi; Sequeira, Paulo D.; Sato, Hisashi; Inamura, Tomonari; Hosoda, Hideki

    2016-01-01

    Al matrix functionally graded materials (FGMs) with oriented Al3Ti platelets were fabricated by a centrifugal solid-particle method. The applied centrifugal forces were 30, 60, and 120G (units of gravity). The orientation and volume fraction gradients of the Al3Ti platelets within the samples were measured. Since a good lattice correspondence was reported for the close-packed directions and the close-packed planes between Al and Al3Ti, the Al matrix in the Al-Al3Ti FGMs fabricated by the centrifugal solid-particle method should have some texture. Al matrix texture was, therefore, analyzed by electron back-scattering diffraction (EBSD). Analysis of the resulting pole figures indicates a preferred orientation along the (200) plane for the Al matrix crystals. Furthermore, increasing the applied centrifugal force enhances the orientation effect. A correlation appears to exist between platelet orientation and the preferred texture of the Al matrix.

  7. Investigation Of Water Assisted Phase Transformation Process From AlPO4-5 to AlPO4-tridymite

    Xu, Suochang; Zhao, Zhenchao; Hu, Mary Y.; Han, Xiuwen; Hu, Jian Z.; Bao, Xinhe

    2016-03-15

    Water assisted phase transformation process from crystalized AlPO4-5 to AlPO4-tridymite was studied by the combination of X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and in situ multinuclear MAS NMR. It is found that water first activates the residue amorphous aluminophosphate in crystalized AlPO4-5 sample through hydrolysis and condensation reactions. Then the activated aluminophosphate species reassemble into AlPO4-tridymite crystalline. Meanwhile, AlPO4-5 transforms into orthorhombic phase during heating process. With further crystallization of AlPO4-tridymite, the amorphous phase is gradually consumed, and mass transportation between AlPO4-5 and AlPO4-tridymite is established through gradually amorphization of AlPO4-5. Finally, most of the AlPO4-5 transforms into the thermodynamically stable dense phase AlPO4-tridymite.

  8. Wallada Bint al Mustakfi entre dos culturas

    shreen Mahmoud Al Refai

    2013-10-01

    Full Text Available La princesa cordobesa Wallada Bint al Mustakfi bil-lah, hija del califa al Mustakfi Muhammad Ibn Abdel Rahman Ibn Obaidil-lah Ibn Al Nasir lidin Al-lah era una poetisa estimable, a quien los grandes poetas no podían superar. Era una mujer única, guapa y decente. Mantenía una relación sentimental con el  poeta y visir Ibn Zaydún. Dicha pasión, narrada por los poemas escritos por ambos amantes, se terminó por la separación debida a los celos, también de ambos;  al poeta le gustó la voz de una esclava de la princesa. Eso dio rabia a la última. Movido también por los celos, Ibn Zaydún dedicó una epístola satírica al visir Ibn Abdús, que estaba enamorado de Wallada. Tal hecho también irritó a la princesa. A pesar de tener amantes y admiradores, Wallada murió sin casarse al  día 2 de safar de 480 (o 484 de la Híjira pasando los ochenta años Me han llamado la atención el carácter tan culto, independiente y liberal de aquella mujer, su relación amorosa con Ibn Zaydún que no acabó felizmente y los muchos años que vivió sin casasre. Parece que la vida de la princesa hispano-musulmana llamó también la atención de muchos escritores árabes y españoles. Prueba de ello son varias obras literarias escritas en árabe y en español sobre Wallada e Ibn Zaydún. Por consiguiente, me resulta muy interesante realizar un estudio comparativo sobre este tema averiguando si, o no, la diferencia de culturas influiría en las opiniones  de los autores sobre la vida sentimental de aquella poetisa cordobesa.

  9. A high degree of enhancement of strength of sputter deposited Al/Al2O3 multilayers upon post annealing

    We report here an order of magnitude enhancement of strength of sputter deposited Al/Al2O3 multilayers after annealing. The increase in strength is shown to be mostly associated with the precipitation of extremely fine γ-Al2O3, 5–10 nm in diameter, in Al layers. This provides a new method of achieving high strength in Al/Al2O3 multilayers that cannot be explained by the Koehler effect or modified Hall–Petch, which will lead to the growth and development of new generation of Al/Al2O3 multilayers. We also examine the fracture behavior of the post annealed Al/Al2O3 multilayered composites with TEM and density functional theory (DFT) simulations. DFT showed that the multilayers are not likely to delaminate at the Al/Al2O3 interface, consistent with the experimental observations. The simulations are also used to determine elastic constants for the γ-Al2O3 phase and to calculate a driving force for O transport from the γ-Al2O3 to the Al layers. The formation of these precipitates is consistent with DFT calculations, which predict an energetic driving force for the dissolution of O atoms from the γ-Al2O3 layers into the Al layers

  10. ELECTROLYSIS OF SWINE MANURE EFFLUENTS USING THREE DIFFERENT ELECTRODES Fe-Fe, Al-Al AND Fe-Al

    S. Rahman

    2014-01-01

    Full Text Available Swine effluent with high organic strength need to be treated to make it suitable for applying to crop/pasture fields, or discharging to any waterways. Electrocoagulation is a relatively simpler and cheaper technique over biological and chemical treatment methods currently used to treat high-strength industrial and municipal wastewater. The performance of an electrocoagulation system mainly depends on the pH, Electrical Conductivity (EC of the medium, Chemical Oxygen Demand (COD loading rates and catalytic activity of the electrodes used. In this research, a study was conducted to compare the pollutant removal efficiencies of three electrodes (Fe-Fe, Al-Al and Fe-Al with three electric current levels (500, 1000 and 2000 mA while treating swine manure effluents. The electrochemical cell consisted of two parallel rectangular plates (90×25×1.5 mm of Iron (Fe-Fe, Aluminum (Al-Al and Iron-Aluminum (Fe-Al, later on described as hybrid electrodes; immersed in a beaker with 550 mL swine effluents and powered by a Direct Current (DC supply. All studies were conducted in batches at room temperature. In general, removal efficiencies were increased with increasing current densities and electrolysis times for electrodes evaluated. Aluminum electrodes outperformed iron and hybrid (iron-aluminum electrodes in removing Total Phosphorus (TP at all current density levels tested. Overall, use of hybrid electrodes resulted in better COD removal. For the same treatment times (1200 s at higher current density (21 mA cm-2, hybrid electrodes removed about 100% COD, which are about 1.9 and 1.3 times higher than those of aluminum and iron electrodes, respectively. Iron electrodes showed the highest removal efficiency (85% for Total Organic Carbon (TOC at 21 mA cm-2 current density and 1200 s treatment time. Overall, lower Specific Electrical Energy Consumptions (SEECs per kg of Pollutants (TP, COD and TOC were estimated for the aluminum

  11. Medien als Lernform und die Trimediale Redaktion

    Wolf Hilzensauer

    2015-01-01

    Full Text Available Der vorliegende Artikel beschreibt ein Konzept für eine handlungsorientierte Medienpädagogik im Bildungsbereich. Im Mittelpunkt steht dabei die SO!-Campusredaktion, die als Methode für expansives Lernen die Möglichkeit bietet, unabhängig von Thema oder Medium die Verantwortung für den Lernprozess in die Hände der Lernenden zu legen. Der Dokumentation von Reflexion über den Lernprozess wird dabei eine besondere Bedeutung zugesprochen. Gleichzeitig werden unterschiedliche mediale Gestaltungsmöglichkeiten (Audio/Radio, Video/Fernsehen und Zeitung – sowohl als Print- als auch als Onlinemedium vorgestellt, die durch das Konzept BYOD – bring your own device – auch einfach und niederschwellig im Bildungskontext umsetzbar sind. Dadurch ergeben sich innovative Möglichkeiten, einen Lernprozess sichtbar zu machen und gleichzeitig eine Grundlage für eine alternative Leistungsbeurteilung anzubieten. Die SO!-Campusredaktion wird derzeit an der Pädagogischen Hochschule Salzburg in Kooperation mit dem Communitysender FS1 und der Radiofabrik entwickelt und erprobt. Community Medien nehmen als MedienpartnerInnen eine bedeutende Stellung ein: Durch ihren offenen Zugang zu Know How und Equipment sowie durch die Möglichkeit, Medienproduktionen über die verfügbaren Distibutionskanäle (Radiofrequenz oder Sendeplatz einer breiten Bevölkerung zugänglich zu machen, gewinnt die Medienpädagogik einen wichtigen Mehrwert in ihrer schulischen und außerschulischen Arbeit. (Dieser Artikel knüpft an den Artikel "BYOD, Smartphonefilme und webbasierte Videoschnittprogramme" der Medienimpulse, Ausgabe 2/2014, an.

  12. Microstructure of Ni-Al powder and Ni-Al composite coatings prepared by twin-wire arc spraying

    Ji-xiao Wang; Gui-xian Wang; Jing-shun Liu; Lun-yong Zhang; Wei Wang; Ze Li; Qi-xiang Wang; Jian-fei Sun

    2016-01-01

    Ni–Al powder and Ni–Al composite coatings were fabricated by twin-wire arc spraying (TWAS). The microstructures of Ni-5wt%Al powder and Ni-20wt%Al powder were characterized by scanning electronic microscopy (SEM) and energy dispersive spec-troscopy (EDS). The results showed that the obtained particle size ranged from 5 to 50μm. The morphology of the Ni–Al powder showed that molten particles were composed of Ni solid solution, NiAl, Ni3Al, Al2O3, and NiO. The Ni–Al phase and a small amount of Al2O3 parti-cles changed the composition of the coating. The microstructures of the twin-wire-arc-sprayed Ni–Al composite coatings were characterized by SEM, EDS, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that the main phase of the Ni-5wt%Al coating consisted of Ni solid solution and NiAl in addition to a small amount of Al2O3. The main phase of the Ni-20wt%Al coating mainly consisted of Ni solid solution, NiAl, and Ni3Al in addition to a small amount of Al and Al2O3, and NiAl and Ni3Al intermet-allic compounds effectively further improved the final wear property of the coatings. TEM analysis indicated that fine spherical NiAl3 pre-cipitates and a Ni–Al–O amorphous phase formed in the matrix of the Ni solid solution in the original state.

  13. Structure of oxides prepared by decomposition of layered double Mg–Al and Ni–Al hydroxides

    Abstracts: Thermal decomposition of Mg–Al and Ni–Al layered double hydroxides LDH at temperatures lower than 800 °C leads to the formation of oxides with different structures. Mg–Al oxide has a very defective structure and consists of octahedral layers as in periclase MgO and mixed octahedral–tetrahedral layers as in spinel MgAl2O4. Mixed Ni–Al oxide has a sandwich-like structure, consisting of a core with Al-doped NiO-like structure and some surface layers with spinel NiAl2O4 structure epitaxial connected with the core. Suggested models were verified by simulation of X-ray diffraction patterns using DIFFaX code, as well as HRTEM, IR-, UV-spectroscopies, and XPS. - Graphical abstract: In the Mg–Al layered double hydroxide Al3+ ions migrate into interlayers during decomposition. The Mg–Al oxide represents sequence of octahedral and octahedral–tetrahedral spinel layers with vacancies. The Ni–Al oxide has a sandwich-like structure with NiO-like core and surface spinel layers as a result of migration of Al3+ ions on the surface. The models explain the presence and absence of “memory effect” for the Mg–Al and Ni–Al oxides, respectively. - Highlights: • We study products of Mg(Ni)–Al LDH decomposition by calcination at 500(400)–800 °C. • In Mg–Al/Ni–Al LDH Al ions migrate into interlayers/on the surface during decomposition. • Mg–Al oxide represents sequence of periclase- and spinel-like layers with vacancies. • Ni–Al oxide has a sandwich-like structure with NiO-like core and surface spinel layers. • The models explain the presence/absence of “memory effect” for Mg–Al/Ni–Al oxides

  14. High noise suppression using magnetically isotropic (CoFe-AlN)/(AlN) multilayer films

    Kijima, Hanae; Ohnuma, Shigehiro; Masumoto, Hiroshi; Shimada, Yutaka; Endo, Yasushi; Yamaguchi, Masahiro

    2015-05-01

    Magnetically isotropic (CoFe-AlN)n/(AlN)n+1 multilayer films, in which the number of CoFe-AlN magnetic layers n ranged from 1 to 27, were prepared by radio frequency sputtering to achieve noise suppression at gigahertz frequencies. The soft CoFe-AlN magnetic layers consisted of nanometer-sized CoFe ferromagnetic grains embedded in an insulating AlN amorphous matrix, while the insulating AlN layers comprised AlN columnar crystals. All films showed a similar frequency dependence of permeability and ferromagnetic resonance of 1.7 GHz. Noise suppression was evaluated using a microstrip line as a noise source by determining the in-line conductive loss and the near-field intensity picked up by magnetic field detective probes. High noise suppression effects were observed in every direction in the film plane. Maximum noise suppression values amounted to 60% for the in-line conductive loss and -20 dB for the magnetic near-field intensity at around 1.7 GHz in the 27-layer film. These high-frequency noise suppression levels may be attributed to eddy current losses and ferromagnetic resonance.

  15. Fabrication and Mechanical Properties of Al_2O_3/TiAl Composites

    AI Taotao

    2009-01-01

    Al_2O_3/TiAl composites were successfully fabricated by hot-press-assisted exother-mic dispersion method with elemental powder mixtures of Ti,Al TiO_2 and Nb_2O_5,and the micro-structure and mechanical properties were investigated.The results indicate the fine Al_2O_3 particles tend to disperse on the grain boundaries.The grain size of TiAl matrix decreases and the hardness increases with increasing Nb_2O_5 content.The bending strength and fracture toughness reach to a maximum when Nb_2O_5 content is 6 wt%,under 642 Mpa and 6.69 Mpa·m ~(1/2) ,respectively.Based on the fractography and the observation of crack propagation path,it is concluded that the strengthening and toughening of such composites at room temperature can be attributed to the refinement of the TiAl matrix,the de-flection behavior in the crack propagation and the dispersion of Al_2O_3 particles.

  16. Neutronic comparison of the nuclear fuels U3Si2/Al and U-Mo/Al

    The search for materials that allow the fabrication of nuclear fuels with higher uranium densities comes from the mid 50s. Today, a high density and low enriched nuclear fuel based on γ-UMo alloys is the most promising fuel to replace the U3Si2/Al dispersion fuel used worldwide in research and material test reactors. Alloys of uranium-molybdenum are prepared with 6 to 10% Mo addition and can be manufactured as dispersion or monolithic fuels. The aim of this paper is to compare the infinite multiplication factor (K∞), obtained through neutronic calculation with the code Scale 6, for aluminum coated plates reflected in all directions containing U3Si2/Al and U-Mo/Al dispersion fuels. The U3Si2/Al dispersion fuel used in the calculation has an uranium density of 4 gU/cm3 and the U-Mo-Al dispersion fuels have densities ranging from 4 to 7.52 gU/cm3 and 7 and 10% Mo addition. The results show that the K∞ calculated for U-Mo/Al fuels is lower than that for U3Si2/Al fuel and increases between the uranium densities of 4 and 5 gU/cm3 and decreases for higher uranium densities. (author)

  17. Electrical defects in AlGaN and InAlN

    Johnstone, D.; Leach, Jacob H.; Kovalskii, Vladimir A.; Fan, Qian; Xie, Jingqiao; Morkoç, Hadis

    2009-02-01

    Compound semiconductors based on GaN have multiple functional applications. Useful compositions include GaN, and ternary and quaternary compositions of (AlGaIn)N. Defects arising from lattice mismatch, point defects, or impurities may act as electrical trapping centers and degrade device efficiency. Current-voltage, capacitance-voltage, thermal admittance spectroscopy (TAS), and deep level transient spectroscopy (DLTS) measurements are applied to characterize the defects in Al0.40Ga0.80N and In0.18Al0.82N in this report. Broad peaks with a shoulder at high temperature dominate the DLTS spectra in each of the materials. An acceptor trap associated with a dislocation appears at 340 K in AlGaN. The defect has an energy of 0.2 eV and capture cross section of 10-21 cm2. A second trap at 0.35 eV, 10-14 cm2 appears in the TAS measurements in addition to the trap at 0.2 eV. Defects in InAlN are dominated by a peak near 150 K. Two traps appear in the TAS measurements. Both traps in the InAlN are acceptors, based on a lack of field dependent emission rates using double pulse DLTS (DDLTS). The two energy levels in InAlN appear to be coupled, with only one state occupied at a time.

  18. Utilização do intercepto-y na avaliação da aptidão anaeróbia e predição da performance de nadadores treinados El uso del intercepto-y en la evaluación de adaptacion anaeróbica en la predicción de la performance de nadadores especializados Use of the y-intercept in the evaluation of the anaerobic fitness and performance prediction of trained swimmers

    Marcelo Papoti

    2005-04-01

    Full Text Available O objetivo desse estudo foi verificar a utilização do intercepto-y na avaliação da aptidão anaeróbia e predição da performance de nadadores treinados. Foram participantes do estudo 14 nadadores com idade entre 15 e 18 anos. Os atletas realizaram o teste de nado atado, performance máxima e velocidade crítica (VC para determinação da capacidade de nado anaeróbio (CTA, todos em nado crawl em um período de três dias. 1 O teste de nado atado consistiu em realizar esforço máximo durante 30 segundos amarrado a um aparato de medição com células de carga para mensuração da força pico (Fpic, aptidão anaeróbia (AP ANA e concentração de lactato pico ([la-]pic conforme Papoti et al. (11; 2 Os participantes realizaram também performances máximas nas distâncias de 100, 200, 300, 400 e 600 m, com intervalo mínimo de duas horas entre cada nado; 3 E o teste de VC foi aplicado para determinação da CTA utilizando todas as combinações possíveis dos resultados das performances máximas, através do modelo de regressão linear entre distância versus tempo. Foi encontrada média de 25,07± 4,22 m nas 16 combinações de CTAs encontradas e coeficiente de regressão linear variando entre 0,99 e 1,00 e erro de coeficiente linear de 19,30± 5,9%. Não foram encontradas correlações significativas entre as CTAs e performances máximas, Fpic (227,81± 63,02 N, AP ANA (86,55± 13,05 N e [la-]pic (6,80± 1,03 mM. Contudo, foram encontradas correlações significativas entre a AP ANA e as performances máximas. Desse modo, é possível concluir que a CTA representada pelo intercepto-y da relação distância versus tempo de nado, parece não ser um bom parâmetro na avaliação da aptidão anaeróbia e predição de performances entre 100 m e 600 m nado crawl.El objetivo de ese estudio fue verificar el uso del intercepto-y en la evaluación anaeróbica de la aptitud y predicción de la performance de los nadadores especializados. Los

  19. Mechanical Properties and Microstructure of Neutron Irradiated Cold-worked Al-1050 and Al-6063 Alloys

    The impact of neutron irradiation on the internal microstructure, mechanical properties and fracture morphology of cold-worked Al-1050 and Al-6063 alloys was studied, using scanning and transmission electron microscopy, and tensile measurements. Specimens consisting of 50 mm long and 6 mm wide gauge sections, were punched out from Al-1050 and Al-6063 23% cold-worked tubes. They were exposed to prolonged neutron irradiation of up to 4.5x1025 and 8x1025 thermal neutrons/m2 (E -3 s-1. In general, the uniform and total elongation, the yield stress, and the ultimate tensile strength increase as functions of fluence. However, for Al-1050 a decrease in the ultimate tensile strength and yield stress was observed up to a fluence of 1x1025 thermal neutrons/m2 which then increase with thermal neutrons fluence. Metallographic examination and fractography for Al-6063 revealed a decrease in the local area reduction of the final fracture necking. This reduction is accompanied by a morphology transition from ductile transgranular shear rupture to a combination of transgranular shear with intergranular dimpled rupture. The intergranular rupture area increases with fluence. In contrast, for Al-1050, fracture morphology remains ductile transgranular shear rupture and the final local area reduction remains almost constant No voids could be observed in either alloy up to the maximum fluence. The dislocation density of cold-worked Al was found to decrease with the thermal neutron fluence. Prolonged annealing of unirradiated cold-worked Al-6063 at 52 degree led to similar results. Thus, it appears that, under our irradiation conditions, whereby the temperature encompassing the samples increases the exposure to this thermal field is the major factor influencing the mechanical properties and microstructure of aluminum alloys

  20. Oxidation Behaviour of Sputtered Ni-3Cr-20Al Alloy

    2000-01-01

    The oxidation behavior of sputtered Ni-3Cr-20Al coating at 900°C in air was investigated. A dense Al2O3 layer was formed on the sputtered Ni-3Cr-20Al coating after 200 h oxidation.However, owing to the segregation of Ni3Al during oxidation Focess at high temperature, the spinel NiAl2O4 was also formed in the Al2O3 layer. It was found that the formation of NiAl2O4had no detrimental effect on the oxidation resistance of the sputtered Ni-3Cr-20Al coating due to the excellent adhesion shown by the Al2O3 and NiAl2O4 complex oxide scale.

  1. Al-rich region of Al−Pt

    Highlights: •The constitution of Al−Pt above 65 at.% Al is specified. •The previously reported Al4Pt, Al21Pt8 and Al2Pt phases are confirmed. •A new stable orthorhombic phase was revealed at ∼75–76 at.% Al and 801–915 °C. -- Abstract: The constitution of the Al-rich part of the Al−Pt alloy system is revised. Apart from the previously reported equilibrium Al4Pt, Al21Pt8 and Al2Pt phases, a complex intermetallic was revealed at 75-76 at.% Al between 801 and 915 °C. Its structure determined by electron diffraction is orthorhombic (Bmmb, a = 1.983, b = 1.636 and c = 1.422 nm)

  2. Questioning of Authentication and Epistemology in Tafsir al-Jilani

    Irwan Masduqi

    2012-06-01

    Full Text Available In this research, the author critically analyzes a biography of Shaikh ‘Abd al-Qadir al-Jilani containing sacred myths. The analyst of sacred myth about ‘Abd al-Qadir al-Jilani is based on the approach of applied anthropology to distinguish between the myths that have  positive and negative values for Muslim society. This research then analyzes the authenticity of Tafsir al-Jilani and the epistemology of his inter- pretation. ‘Abd al-Qadir al-Jilani is the founder of Qadiriyah. Qadiriyah doctrines has been widely accepted by traditional Muslim groups in Muslim world, so that the study of Tafsir al-Jilani is very meaningful for the followers of Qadiriyah in particu- lar and the lovers of Quranic studies in general to increase their knowledge about the teachings of ‘Abd al-Qadir al-Jilani.

  3. A model of Fe3+-Kaolinite, Al3+-Goethite, Al3+-Hematite equilibria in laterites

    Trolard, F.; Tardy, Yves

    1989-01-01

    Cet article propose un modèle thermodynamique, basé sur un équilibre idéal solide-solution, pour le système Fe2O3-Al2O3-SiO2-H2O prenant en compte les activités de l'eau et de la silice. Le modèle permet de calculer la quantité des phases présentes, les pourcentages de substitution en Al et Fe pour la geothite, l'hématite, la Kaolinite ainsi que la stabilité des phases sous différentes conditions.

  4. Hardness Measurement of (TiB2-TiAl)/TiAl Symmetrically Function Gradient Materials

    2002-01-01

    (TiB2-TiAl)/TiAl symmetrically function gradient materials (FGM) were prepared by spark plasma sintering (SPS). Owing to the difference of the thermal expansion coefficients between TiB2 and TiAl, a compressive surface stress was introduced to the FGM by the thermal expansion mismatch. The hardness values of the uniform materials and the FGM were tested, respectively. For the FGM with a compressive surface stress, hardness is obviously superior to that of the uniform material.When the FGM was subjected to heat treatment,the hardness decreased due to a partial relaxation of the compressive surface stress.

  5. Punishment on Stage: Application of Islamic Criminal Law by Harakat al-Shabaab al-Mujahideen

    2011-01-01

    Harakat al-Shabaab al-Mujahideen, usually referred to as al-Shabaab (“the youth”), is mostly known as a Somali terrorist group. But since the end of 2008 it has functioned as a state power in large parts of Southern and Central Somalia. In this study I sketch out the structure and function of the legal system of the group. Over the last three years they have developed an administrative structure and a legal system which is unprecedented in the Somali conflict, which has lasted for more than 2...

  6. AlSb precipitate evolution during Sb implantation in Al: experiment and theory

    Precipitate evolution during ion implantation has been studied in the model system Sb-implanted Al. Transmission electron microscopy was used to determine the size distribution of AlSb crystallites as a function of fluence, flux, and sample temperature. There was a dramatic increase in average size, accompanied by a decrease in number density, for increasing fluence, for decreasing flux, and for increasing temperature. A new theoretical model for the evolution of the precipitate size distribution has been developed which incorporates both thermal processes and implantation effects. Numerical solutions for the AlSb system using physically realistic parameters agree qualitatively with the experimentally observed evolutions

  7. Atomic layer epitaxy of AlAs and AlGaAs

    Meguro, T.; Iwai, S.; Aoyagi, Y.; Ozaki, K.; Yamamoto, Y.; Suzuki, T.; Okano, Y.; Hirata, A.

    1990-01-01

    Atomic layer epitaxy (ALE) of AlAs and AlGaAs with metalorganic vapor-phase epitaxy (MOVPE) under Ar-ion laser irradiation has been successfully realized in a triethylaluminum (TEA)/AsH 3 system for the first time. Comparison with the growth characteristics of MOVPE with alternative feeding modes of TMA/AsH 3 and TEA/AsH 3 is discussed. Application to laser-ALE of AlGaAs using a triethylgallium (TEG)/TEA/AsH 3 system is also discussed.

  8. 5083 type Al-Mg and 6082 type Al-Mg-Si alloys for ship building

    Burcu Ertuğ

    2015-03-01

    Full Text Available Marine transport is increasing its use of aluminium by capitalizing on its two leading qualities: lightness and corrosion resistance. The most popular aluminium alloys for use in corrosive environmentssuch as seawater are the 5xxx and 6xxx series alloys, which demonstrate adequate strength and excellent corrosion resistance. The traditional and the most often used Al-alloys in shipbuilding are 5083 type Al-Mg alloy for plates, and 6082 type Al-Mg-Si alloy for extrusions. These alloys were found to be reliable in marine service as well as during manufacturing.

  9. A 25-year replication of Katz et al.'s (1988) metaphor norms.

    Campbell, Spencer J; Raney, Gary E

    2016-03-01

    Research in metaphor processing has made extensive use of the normed metaphor database created by Katz, Paivio, Marschark, & Clark (Metaphor and Symbolic Activity, 3, 191-214, 1988). Because of the plasticity of figurative language, we conducted a renorming of selected metaphors from the database on a new student population. Correlations between Katz et al.'s and the present data showed that the pattern of responses has remained highly consistent across time and populations. The consistency of the normative ratings allows us to be confident in future research that will use the Katz et al. collection. PMID:25772671

  10. The Formation of γ—AlON Spinel in the Reaction of Al2O3—AlN—MgO System

    LIYawei; YUANRunzhang; 等

    1997-01-01

    The stabilization of γ-aluminium oxyni-tride spinel(γ-AlON) has been investigated by addition of MgO,MgAl2O4,etc.,in reaction process.The results indicated that there are wider solid solution areas near ,Al2O3-rich side in AlN-Al2O3-MgO ternary systems,The content of stabilized AlON phase in samples is related to heating temperatures,additives,etc.The lattice parameters of their AlON phases could be well describedby the equation: a0=0.7900+0.0375[MgO]+0.015[AlN](nm)

  11. Influence of matrix characteristics on fracture toughness of high volume fraction Al2O3 / Al-AlN composites

    Nagendra, N.; Jayaram, V

    2000-01-01

    The role of matrix microstructure on the fracture of Al-alloy composites with 60 % volume of alumina particulates has been studied. The matrix composition and microstructure were systematically varied by changing the infiltration temperature and heat treatment. Characterisation was carried out by a combination of metallography, hardness measurements and fracture studies conducted on compact tension (CT) specimens to study the fracture toughness and crack growth in the composites. The composit...

  12. Properties of porous FeAlO/FeAl ceramic matrix composite influenced by mechanical activation of FeAl powder

    V Usoltsev; S Tikhov; A Salanov; V Sadykov; G Golubkova; O Lomovskii

    2013-12-01

    Porous ceramic matrix composites FeAlO/FeAl with incorporated metal inclusions (cermets) were synthesized by pressureless method, which includes hydrothermal treatment of mechanically alloyed FeAl powder followed by calcination. Their main structural, textural and mechanical features are described. Variation of FeAl powder alloying time results in non-monotonous changes of the porosity and mechanical strength. Details of the cermet microstructure and its relation to the mechanical properties are discussed.

  13. TEM characterization of Al-C-Cu-Al{sub 2}O{sub 3} composites produced by mechanical milling

    Santos-Beltran, A. [Centro de Investigacion en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, C.P. 31109, Chihuahua, Chih. (Mexico); Gallegos-Orozco, V. [Centro de Investigacion en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, C.P. 31109, Chihuahua, Chih. (Mexico); Estrada-Guel, I. [Centro de Investigacion en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, C.P. 31109, Chihuahua, Chih. (Mexico); Bejar-Gomez, L. [Universidad Mich. de San Nicolas de Hidalgo, Edif. ' W' , C.U., C.P. 58000, Morelia, Mich. (Mexico); Espinosa-Magana, F. [Centro de Investigacion en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, C.P. 31109, Chihuahua, Chih. (Mexico); Miki-Yoshida, M. [Centro de Investigacion en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, C.P. 31109, Chihuahua, Chih. (Mexico); Martinez-Sanchez, R. [Centro de Investigacion en Materiales Avanzados (CIMAV), Miguel de Cervantes No. 120, C.P. 31109, Chihuahua, Chih. (Mexico)]. E-mail: roberto.martinez@cimav.edu.mx

    2007-05-31

    Novel Al-based composites (Al-C-Cu-Al{sub 2}O{sub 3}) obtained by mechanical milling (MM), were characterized by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS). Analyses of composites were carried out in both, the as-milled and the as-sintered conditions. C nanoparticles were found in the as-milled condition and Al{sub 2}O{sub 3} nanofibers were found in as-sintered products, as determined by EELS. C and Cu react with Al to crystallize in Al{sub 3}C{sub 4} and Al{sub 2}Cu structures, respectively.

  14. Measurement of the 27Al(n,2n)26Al cross section using accelerator mass spectrometry

    The 27Al(n,2n)26Al cross section is of great interest for the waste disposal assessment of fusion reactor materials and fusion research. By the technique of accelerator mass spectrometry, the authors have measured the 26Al/27Al ratio of Al2O3 powder samples which were irradiated by a neutron beam. The neutron reaction cross section for 27Al(n,2n)26Al in the energy range of 14.8-14.9 MeV are deduced

  15. Precipitation hardening in ternary alloys of the Al-Sc-Cu and Al-Sc-Si systems

    The processes of precipitation hardening in cast ternary alloys of the Al-Sc-Cu and Al-Sc-Si systems were studied in the temperature range of aging from 100 to 450 C and at exposures to 200 h. It was shown that the CuAl2 and ScAl3 phases were involved in the process of aging in ternary Al-Sc-Cu alloys, and the Si and V (AlSiSc) phases, in ternary Al-Sc-Si alloys with excess silicon in a supersaturated solid solution. The V phase was for the first time revealed as the hardening phase in aluminum alloys

  16. The Byzantines in Medieval Arabic Poetry: Abu Firas’ "Al-Rumiyyat" and the Poetic Responses of al-Qaffal and Ibn Hazm to Nicephore Phocas’ "Al-Qasida al-Arminiyya al-Malʿuna" (The Armenian Cursed Ode

    Nizar F. HERMES

    2009-10-01

    Full Text Available Up until the Crusades, it was al-Rūm who were universally seen by Arab writers and Arab poets in particular as the Other par excellence. Nowhere is this more conspicuous than in the sub-genre of Al-Rūmiyyat (poems about the Byzantines, namely as found in the Rūmiyyat of Abu Firas al-Hamdani(d.968, and in the poetic responses of al-Qaffal(d. 946 and Ibn Hazm(d. 1064 to what was described by several medieval Muslim chronicles as Al-Qasida al-Arminiyya al-Malʿuna (The Armenian Cursed Ode. By exploring the forgotten views of the Byzantines in medieval Arabic poetry, this article purports to demonstrate that contrary to the impression left after reading Edward Said’s groundbreaking Orientalism: Western Conceptions of the Orient (1978 and other postcolonial studies, Orientals have not existed solely to be ‘orientalized’. Perhaps even before this came to be so, they too had ‘occidentalized’ their Euro-Christian Other(s in a way that mirrored in reverse the subject/object relationship described as Orientalism.

  17. Characterization of Al30 in commercial poly-aluminum chlorohydrate by solid-state (27)Al NMR spectroscopy.

    Phillips, Brian L; Vaughn, John S; Smart, Scott; Pan, Long

    2016-08-15

    Investigation of commercially produced hydrolysis salts of aluminum by solid-state (27)Al NMR spectroscopy and size-exclusion chromatography (SEC) reveals well-defined and distinct Al environments that can be related to physicochemical properties. (27)Al MAS and MQ-MAS NMR spectroscopic data show that the local structure of the solids is dominated by moieties that closely resemble the Al30 polyoxocation (Al30O8(OH)56(H2O)26(18+)), accounting for 72-85% of the total Al. These Al30-like clusters elute as several size fractions by SEC. Comparison of the SEC and NMR results indicates that the Al30-like clusters includes intact isolated clusters, moieties of larger polymers or aggregates, and possibly fragments resembling δ-Al13 Keggin clusters. The coagulation efficacy of the solids appears to correlate best with the abundance of intact Al30-like clusters and of smaller species available to promote condensation reactions. PMID:27232539

  18. Microstructural Analysis of Al/Al2O3/Gr Powder Composites Produced by Mechanical Alloying

    Gheorghe Iacob

    2011-09-01

    Full Text Available Powder samples of Al/Al2O3/Gr hybrid composites with different weight percents were obtained by mechanical alloying in a high energy ball mill. The aim of this study is to investigate the effect of alumina and graphite particles content on the microstructure of Al/Al2O3/Gr hybrid composites. Results obtained using Scanning Electron Microscopy (SEM as well as Energy-Dispersive X-ray Spectroscopy (EDS show that the addition of alumina particles as the reinforcement has a drastic effect on the size and morphology of the composite powders. Also, the addition of graphite particles as one of the reinforcing components is presumed to improve tribological properties by forming a graphite-rich lubricant film between the sliding surfaces.

  19. Local stress-induced effects on AlGaAs/AlOx oxidation front shape

    Chouchane, F.; Almuneau, G., E-mail: almuneau@laas.fr; Arnoult, A.; Lacoste, G.; Fontaine, C. [CNRS, LAAS, 7 avenue du colonel Roche, F-31400 Toulouse (France); Univ de Toulouse, UPS, LAAS, F-31400 Toulouse (France); Cherkashin, N. [Univ de Toulouse, UPS, LAAS, F-31400 Toulouse (France); CNRS, CEMES, 29 Rue Jeanne Marvig, 31055 Toulouse Cedex 4 (France)

    2014-07-28

    The lateral oxidation of thick AlGaAs layers (>500 nm) is studied. An uncommon shape of the oxide tip is evidenced and attributed to the embedded stress distribution, inherent to the oxidation reaction. Experimental and numerical studies of the internal strain in oxidized Al{sub x}Ga{sub 1−x}As/GaAs structures were carried out by dark-field electron holography and finite element methods. A mapping of the strain distribution around the AlGaAs/oxide interface demonstrates the main role of internal stress on the shaping of the oxide front. These results demonstrate the high relevance of strain in oxide-confined III-V devices, in particular, with over-500-nm thick AlOx confinement layers.

  20. Structure formation of AlMg2-AlN composite cast in electromagnetic field

    M. Cholewa; M. Staszewski; M. Sozańska; B. Formanek

    2007-01-01

    Purpose: Basic material concept, technology and some results of studies on aluminum matrix composite with dispersive aluminum nitride reinforcement was shown. Studied composites were manufactured with use f ex-situ technique and powder metallurgy.Design/methodology/approach: Aluminum nitride powder was manufactured in process of self-evolving high-temperature synthesis SHS. Composite powder Al-AlN was obtained using mechanical alloying. Composite castings were manufactured in stir casting pro...

  1. One of the Students of Mawlana Khalid al-Baghdadi: Sayyid Taha al-Hakkari

    Zeki Tan

    2013-01-01

    Sayyid Taha al-Hakkari kept the scholar tradition he learned from his teacher Mawlana Khalid al-Baghdadi alive in the geography he lived, Hakkari. In the period he lived, Sayyid Taha attracted the attention of the Iranian administrators because of its charismatic personality and they even tried to form a close bond by sending him various gifts. And Ottoman administrators maintain the peace in the region by benefiting from the conciliator personality and moral identity of Sayyid Taha. This spi...

  2. Muslih b. `Abd al-Rahman al-Maraqî : Muslikh of Mranggen

    Bruinessen, M.M. van

    2007-01-01

    MUSLIH b. `ABD AL-RAHMAN AL-MARAQÎ (KH. Muslikh of Mranggen) [Indonesia; 1917-1981] [Dictionnaire biographique des savants et grandes figures du monde musulman périphérique, du XIXe siècle à nos jours, Fasc. no 2. Paris: CNRS-EHESS, 1998, p. 23-24] One of the most influential Javanese teachers of the tarîqa Qâdiriyya wa Naqshbandiyya and the author of several popular books concerning this Sufi order.

  3. Structure of molten Al-Si alloys

    The temperature variation of the structure and microstructure of molten eutectic Al1-xSix alloys (x = 0.122 and 0.20) have been studied by neutron diffraction and small-angle neutron scattering (SANS), as well as measurements performed on pure liquid Al. All measurements have been performed at five temperatures in a heating-cooling loop. The SANS results unambiguously show that for the eutectic alloy (x = 0.122) the microstructure changes with increasing temperature in a partly reversible way while for the hypereutectic (x = 0.20) alloy the change is almost completely irreversible. This change in microstructure also manifests itself in the shape of the static structure factor S(Q)

  4. Ni{sub 3}Al technology transfer

    Sikka, V.K.; Santella, M.L.; Alexander, D.J. [Oak Ridge National Laboratory, TN (United States)] [and others

    1995-05-01

    Ductile Ni{sub 3}Al and Ni{sub 3}Al-based alloys have been identified for a range of applications. These applications require the use of material in a variety of product forms such as sheet, plate, bar, tubing, piping, and castings. Although significant progress has been made in the melting, casting, and near-net-shape forming of nickel aluminides, some issues still remain. These include the need for (1)high-strength castable composition for turbochargers, furnace furniture, and hot-die applications; (2) castability (fluidity, hot-shortness, porosity, etc.); (3) weld reparability of castings; and (4) hot fabricability of cast ingots. All of the issues listed above can be {open_quotes}show stoppers{close_quotes} for the commercial application of nickel aluminides. This report describes work completed to address some of these issues during the fourth quarter of FY 1994.

  5. Léxico relativo al vestuario infantil

    Torres Villaseñor, Hermila E.; Centro de Lingüística Hispánica, IIFL, UNAM

    2013-01-01

    Con base en el Cuestionario preparado por la Comisión de Lingüísticay Dialectología Iberoamericanas para el estudio del españolc ontemporáneo, preparé un cuestionario más amplio, con el cual he llevado a cabo una investigación sobre el léxico referente al vestido, según se emplea actualmente en la ciudad de México. Presento aquí los resultados de mi estudio en lo que respecta, únicamente, al vestuario de los niños menores de un año. Toda ladocumentación fue proporcionada por doce informantes ...

  6. Ni{sub 3}Al technology transfer

    Sikka, V.K.; Viswanathan, S.; Santella, M.L. [Oak Ridge National Lab., TN (United States)] [and others

    1997-04-01

    Ductile Ni{sub 3}Al and Ni{sub 3}Al-based alloys have been identified for a range of applications. These applications require the use of material in a variety of product forms such as sheet, plate, bar, wire, tubing, piping, and castings. Although significant progress has been made in the melting, casting, and near-net-shape forming of nickel aluminides, some issues still remain. These include the need for: (1) high-strength castable composition for many applications that have been identified; (2) castability (mold type, fluidity, hot-shortness, porosity, etc.); (3) weld reparability of castings; and (4) workability of cast or powder metallurgy product to sheet, bar, and wire. The four issues listed above can be {open_quotes}show stoppers{close_quotes} for the commercial application of nickel aluminides. This report describes the work completed to address some of these issues during FY 1996.

  7. Antiferromagnetic behaviour of Tb2Al alloy

    Rojas, D. P.; André, G.; Rodríguez Fernández, J.; Sánchez Marcos, J.; Fernández Barquín, L.; Echevarria, C.

    2011-10-01

    The structural, thermal and magnetic properties ol the Tb2Al alloy have been investigated by AC/DC magnetic susceptibility, specific heat, X-ray and neutron diffraction measurements. DC and AC-magnetic susceptibility results are consistent with an AFM order at TN = 52 K. The specific heat data show a lambda anomaly associated to the magnetic transition with a peak at 52 K (cord = 99 J/molTbK). The analysis of thermodiffractograms of neutron diffraction patterns indicates that, below the ordering temperature, the magnetic reflections can be indexed with a commensurate lattice related to the crystallographic cell (Pmna) by a propagation vector k = (1/2, 1/2, 1/2). The results are compared with those reported for other magnetic rare earth alloys of R2Al-type (with R = Nd, Gd and Dy).

  8. Antiferromagnetic behaviour of Tb2Al alloy

    The structural, thermal and magnetic properties ol the Tb2Al alloy have been investigated by AC/DC magnetic susceptibility, specific heat, X-ray and neutron diffraction measurements. DC and AC-magnetic susceptibility results are consistent with an AFM order at TN = 52 K. The specific heat data show a lambda anomaly associated to the magnetic transition with a peak at 52 K (cord = 99 J/molTbK). The analysis of thermodiffractograms of neutron diffraction patterns indicates that, below the ordering temperature, the magnetic reflections can be indexed with a commensurate lattice related to the crystallographic cell (Pmna) by a propagation vector k = (1/2, 1/2, 1/2). The results are compared with those reported for other magnetic rare earth alloys of R2Al-type (with R = Nd, Gd and Dy).

  9. Communication Support for People with ALS

    David Beukelman

    2011-01-01

    Full Text Available Almost all people with amyotrophic lateral sclerosis (ALS experience a motor speech disorder, such as dysarthria, as the disease progresses. At some point, 80 to 95% of people with ALS are unable to meet their daily communication needs using natural speech. Unfortunately, once intelligibility begins to decrease, speech performance often deteriorates so rapidly that there is little time to implement an appropriate augmentative and alternative communication (AAC intervention; therefore, appropriate timing of referral for AAC assessment and intervention continues to be a most important clinical decision-making issue. AAC acceptance and use have increased considerably during the past decade. Many people use AAC until within a few weeks of their deaths.

  10. En torno al lenguaje, entornos del lenguaje

    Carmen Carbone

    2011-12-01

    Full Text Available ¿Es demostrable alguna relación entre lengua y visión del mundo? Si se considera al individuo como ser al margen de su entorno, la visión del mundo es una facultad meramente individual, y la lengua no desempeñaría así ningún papel. En cambio, si el individuo no es concebible sino como fruto de su entorno, el sustento básico de tal visión sería la lengua. ------------------------------------------------ Is there a demonstrable relationship between language and world view? If we think of the individual as a being who is separate from his environment, his world view is merely a personal trait in which language would play no role. On the other hand, if the individual can only be understood as the product of his environment, then language would become the underlying basis of his world view.

  11. Structure of molten Al-Si alloys

    Dahlborg, U. [CNRS, Ecole des Mines, Nancy, France; Besser, M. [Ames Laboratory; Calvo-Dahlborg, M. [CNRS, Ecole des Mines, Nancy, France; Cuello, G. [Institut Laue-Langevin (ILL); Dewhurst, C. D. [Institut Laue-Langevin (ILL); Kramer, Matthew J. [Ames Laboratory; Morris, James R [ORNL; Sordelet, Daniel [Ames Laboratory

    2007-01-01

    The temperature variation of the structure and microstructure of molten eutectic Al{sub 1-x}Si{sub x} alloys (x = 0.122 and 0.20) have been studied by neutron diffraction and small-angle neutron scattering (SANS), as well as measurements performed on pure liquid Al. All measurements have been performed at five temperatures in a heating-cooling loop. The SANS results unambiguously show that for the eutectic alloy (x = 0.122) the microstructure changes with increasing temperature in a partly reversible way while for the hypereutectic (x = 0.20) alloy the change is almost completely irreversible. This change in microstructure also manifests itself in the shape of the static structure factor S(Q).

  12. Crítica al funcionalismo normativista

    Demetrio Crespo, Eduardo

    2010-01-01

    El artículo gira en torno al modelo de pensamiento del funcionalismo «normativista» formulado por Günther Jakobs y de las bases metodológicas que han hecho desembocar su teoría de la pena en el ambiguo concepto del llamado «derecho penal del enemigo» como teoría de la excepción penal.

  13. Complementary and Alternative Therapies in ALS

    Bedlack, Richard S.; Joyce, Nanette; Carter, Gregory T.; Pagononi, Sabrina; Karam, Chafic

    2015-01-01

    Given the severity of their illness and lack of effective disease modifying agents, it is not surprising that most patients with ALS consider trying complementary and alternative therapies. Some of the most commonly considered alternative therapies include special diets, nutritional supplements, cannabis, acupuncture, chelation and energy healing. This chapter reviews these in detail. We also describe 3 models by which physicians may frame discussions about alternative therapies: paternalism,...

  14. Ammoniakemissiereductie via zelfregulering : melkureumgehalte als case

    Ham, van den, R.

    2009-01-01

    In 2005/2006 werd getoetst of de ammoniakemissie gereduceerd kan worden door zelfregulering. Hiervoor werd melkureum als indicator gekozen. Melkveehouders werde op die wijze aangesproken op hun eigen ambities, drijfveren en sterke punten. Een zelf gemaakt en gekozen bedrijfsplan vanuit de eigen situatie en het stimuleren van het eigen zoekproces maakt deel uit van die motivatieIn 2005/2006, an assessment took place to see whether ammonia emissions could be reduced through selfregulation. Milk...

  15. Thaghut dalam Al-Qur’an

    Laila Sari Masyhur

    2012-12-01

    Full Text Available Tulisan berikut membahas konsep thâghût dalam al-Qur’an dengan menggunakan pendekatan tafsir tematik. Term thâghût berasal dari akar kata thaghâ yang secara bahasa berarti melanggar batas, berbuat sewenang-wenang, kejam atau menindas, melebihi ketentuan yang ada, meninggi dan melampaui batas dalam hal pengingkaran. Penulis menelusuri ayat-ayat al-Quran yang berbicara topik thâghût, hasilnya menemukan bahwa dalam al-Qu’ran kata ini dengan berbagai derivasinya (isytiqaq diulang sebanyak 39 kali yang tersebar dalam 39 ayat dan 27 surat. Dilihat dari segi struktur atau bentuk pengungkapan, term thâghût yang tersebar di dalam al-Qur’an tersebut setidaknya muncul dalam lima bentuk kata jadian (isytiqaq yang masing-masing implikasi makna yang berbeda-beda. Tulisan berikut membahas sedikitnya sembilan macam pengungkapan thâghût dengan berbagai pemaknaan dengan tekanan yang beragam, seperti misalnya anjuran untuk tidak mempercayai thâghût; peringatan bahwa thâghût menuntun manusia pada kekufuran; mempersekutukan Allah dengan mengimani thâghût; pemberitaan tentang orang-orang yang berhukum pada thâghût; orang-orang yang berperang di jalan thâghût; balasan Allah terhadap penyembah thâghût; perintah menghindari penyembahan thâghût; kabar gembira bagi yang menghindari penyembahan thâghût; dan faktor-faktor yang membuat manusia bekerjasama dengan thâghût. Elaborasi dari topik-topik tersebut bermaksud untuk menegaskan larangan Islam terhadap thâghût dan hal-hal yang berkaitan dengannya.

  16. Globale Entwikclung als Lernbereich in den Naturwissenschaften

    Härtig, Hendrik; Bernholt, Sascha; Schroeter, Burkhard

    2014-01-01

    Mit dem Orientierungsrahmen für den Lernbereich Globale Entwicklung wurden Anregungen gegeben, die Themen nachhaltige Entwicklung und globale Entwicklung im Unterricht in allen Schulfächern aufzugreifen. Die drei naturwissenschaftlichen Schulfächer Biologie, Chemie und Physik haben sich bislang sehr unterschiedlich auf das Thema eingelassen. In der Biologiedidaktik finden sich sowohl Forschungsarbeiten als auch Unterrichtsvorschläge; für Chemie und insbesondere Physik existieren hingegen nur ...

  17. Combating Al Qaeda's Splinters: Mishandling Suicide Terrorism

    Atran, Scott

    2004-01-01

    The past three years saw more suicide attacks than the last quarter century. Most of these were religiously motivated. While most Westerners have imagined a tightly coordinated transnational terrorist organization headed by Al Qaeda, it seems more likely that nations under attack face a set of largely autonomous groups and cells pursuing their own regional aims. Repeated suicide actions show that massive counterforce alone does not diminish the frequency or intensity of suicide attack. Like p...

  18. Psychosocial adjustment to ALS: a longitudinal study

    Tamara eMatuz

    2015-09-01

    Full Text Available For the current study the Lazarian stress-coping theory and the appendant model of psychosocial adjustment to chronic illness and disabilities (Pakenham 1999 has shaped the foundation for identifying determinants of adjustment to ALS. We aimed to investigate the evolution of psychosocial adjustment to ALS and to determine its long-term predictors. A longitudinal study design with four measurement time points was therefore, used to assess patients’ quality of life, depression, and stress-coping model related aspects, such as illness characteristics, social support, cognitive appraisals and coping strategies during a period of two years. Regression analyses revealed that 55% of the variance of severity of depressive symptoms and 47% of the variance in quality of life at T2 was accounted for by all the T1 predictor variables taken together. On the level of individual contributions, protective buffering and appraisal of own coping potential accounted for a significant percentage in the variance in severity of depressive symptoms, whereas problem management coping strategies explained variance in quality of life scores. Illness characteristics at T2 did not explain any variance of both adjustment outcomes. Overall, the pattern of the longitudinal results indicated stable depressive symptoms and quality of life indices reflecting a successful adjustment to the disease across four measurement time points during a period of about two years.Empirical evidence is provided for the predictive value of social support, cognitive appraisals, and coping strategies, but not illness parameters such as severity and duration for adaptation to ALS. The current study contributes to a better conceptualization of adjustment, allowing us to provide evidence-based support beyond medical and physical intervention for people with ALS.

  19. Response to de la Iglesia et al.

    Yetish, Gandhi; Kaplan, Hillard; Gurven, Michael; Wood, Brian; Pontzer, Herman; Manger, Paul R; Wilson, Charles; McGregor, Ronald; Siegel, Jerome M

    2016-04-01

    We wish to respond to the commentary of de la Iglesia et al. [1]. Studies comparing sleep in different communities have different goals. One frequent goal has been to determine how sleep is affected by manipulating specific 'modern' conditions. Many studies have investigated the effect of artificial light and electronic entertainment. Such studies have clearly shown that light, particularly blue light, delays sleep onset [2]. Studying the effect of artificial light on sleep was not a goal of our study. PMID:27046810

  20. Vacuum metallurgy of TiAl intermetallics

    Zemčík, L.; Dlouhý, Antonín; Król, S.; Pražmowski, M.

    Ostrava : Tanger s.r.o, 2005, s. 1-11. [Metal 2005. Hradec nad Moravicí (CZ), 24.05.2005-26.05.2005] R&D Projects: GA ČR(CZ) GA106/04/0853 Grant ostatní: GA MŠMT(CZ) KONTAKT 55 Institutional research plan: CEZ:AV0Z20410507 Keywords : vacuum melting * TiAl intermetallics Subject RIV: JG - Metallurgy

  1. Telefoninterviews als Datenerhebungsstrategie: Erfahrungen und Empfehlungen

    Burke, Lisa A.; Miller, Monica K.

    2001-01-01

    In dem vorliegenden Beitrag werden konkrete Vorschläge zur Nutzung von Telefoninterviews als Datenerhebungsstrategie gemacht. Unsere Überlegungen sind an all jene adressiert, die telefonische Interviews durchführen (wollen), wobei sie vor allem für diejenigen Forscher(innen) hilfreich sein dürften, die über keine oder nur geringe Erfahrungen mit dieser Erhebungsmethode verfügen. Es werden zahlreiche praktische Empfehlungen gegeben, die üblicherweise in der traditionellen Forschungsliteratur n...

  2. Commissioning experiences of the ALS booster synchrotron

    Installation of the ALS booster synchrotron proper was completed on April 30, 1991, and commissioning has just begun. Circulating beam around the booster was observed on the first day of operation, May 3, 1991. The beam was visible for about 400 turns. In this paper we describe the status and commissioning experience of the 1.5-GeV electron synchrotron accelerator. 14 refs., 2 figs., 4 tabs

  3. Die globale Finanzkrise als Kumulation von Dilemmastrukturen

    Münch, Philipp Alexander

    2012-01-01

    Was als sogenannte „Subprime-Krise“ auf dem US-Immobilienmarkt begann, hat sich zu einer sehr ernsten Finanz-, Banken- und Staatsschuldenkrise mit hohen Vermögensverlusten, Konkursen, sozialem Elend und beträchtlichen Bürden für Steuerzahler weiterentwickelt. Sogar die Existenz der Europäischen Währungsunion steht auf dem Spiel. Zahlreiche Analysebeiträge behandeln eine Vielzahl von Verursachungsfaktoren. In vorliegender Arbeit werden ganze Pyramiden von Dilemmastrukturen unterschiedlicher hi...

  4. A comparative wear study on Al-Li and Al-Li/SiC composite

    Okumus, S. Cem, E-mail: cokumus@sakarya.edu.tr; Karslioglu, Ramazan, E-mail: cokumus@sakarya.edu.tr; Akbulut, Hatem, E-mail: cokumus@sakarya.edu.tr [Sakarya University Engineering Faculty, Department of Metallurgical and Materials Engineering, Esentepe Campus, 54187, Sakarya (Turkey)

    2013-12-16

    Aluminum-lithium based unreinforced (Al-8090) alloy and Al-8090/SiCp/17 vol.% metal matrix composite produced by extrusion after spray co-deposition. A dry ball-on disk wear test was carried out for both alloy and composite. The tests were performed against an Al{sub 2}O{sub 3} ball, 10 mm in diameter, at room temperature and in laboratory air conditions with a relative humidity of 40-60%. Sliding speed was chosen as 1.0 ms{sup −1} and normal loads of 1.0, 3.0 and 5.0 N were employed at a constant sliding distance of 1000 m. The wear damage on the specimens was evaluated via measurement of wear depth and diameter. Microstructural and wear characterization was carried out via scanning electron microscopy (SEM). The results showed that wear loss of the Al-8090/SiC composite was less than that of the Al-8090 matrix alloy. Plastic deformation observed on the wear surface of the composite and the matrix alloy, and the higher the applied load the greater the plastic deformation. Scanning electron microscopy examinations of wear tracks also reveal that delamination fracture was the dominant wear mechanism during the wear progression. Friction coefficient was maximum at the low applied load in the case of the Al-8090/SiC composite while a gradual increase was observed with applied load for the matrix alloy.

  5. Softening Kinetics in High Al and High Al-Nb-Microalloyed Steels

    Pereda, B.; Aretxabaleta, Z.; López, B.

    2015-03-01

    Double-hit torsion tests were performed in order to study the effect of high Al levels (up to 2 wt.%) and Nb microalloying (up to 0.07 wt.%) on the static softening kinetics of 0.2%C-2%Mn steels. The addition of 1%Al leads to a delay in the softening kinetics due to solute-drag effect, equivalent to that exerted by 0.027%Nb. For the 2%Al steels, at temperatures below 1000 °C, γ → α phase transformation occurs after deformation, resulting in a larger retardation of the softening kinetics. At temperatures higher than 1000 °C, Nb in solid solution also contributes to the retardation of the static softening kinetics, and at lower temperatures NbC strain-induced precipitation leads to incomplete softening for the 1%Al steel, and to a complex interaction between softening, phase transformation, and NbC strain-induced precipitation for the 2%Al-Nb steels. The effect of Al on the static softening kinetics was quantified and introduced in a model developed in previous works for the prediction of the austenite microstructural evolution. In order to validate the results of the model, multipass torsion tests were carried out at conditions representative of hot strip and plate rolling mills. Model predictions show reasonable agreement with the results obtained at different deformation conditions.

  6. Al-based precipitate evolution during high temperature annealing of Al implanted in Si

    Galvagno, G.; Spinella, C.; Ferla, A. la; Rimini, E. (Ist. di Metodologie e Tecnologie per la Microelettronica-CNR, Catania (Italy). Dipt. di Fisica); Scandurra, A. (Consorzio Catania Ricerche, Catania (Italy)); Raineri, V. (Univ. di Catania, (Italy). Dipt. di Scienze Chimiche); Torrisi, A. (CORIMME, Catania (Italy))

    1993-08-01

    Al-based precipitate evolution for 80 keV Al ions implanted in Si has been investigated. Precipitates are formed during high temperature annealings of 1 [times] 10[sup 15]/cm[sup 2] implanted samples. They are located at two depths where Al concentration peaks are detected. Al atoms are gettered into the extended defects present in the crystal and/or precipitate when their concentration is higher than the solid solubility value at the annealing temperature. Increasing annealing time, precipitates dissolve out and only a small fraction of atoms diffuses into the sample, meanwhile the greater part evaporates from the sample. At 1 [times] 10[sup 13]/cm[sup 2] dose Al concentration is below the solid solubility limit. The secondary defects are not detected and the dopant profile does not display anomalous peaks. Moreover, all the implanted Al is electrically active and remains in the sample during the first instant of annealing. At higher annealing times it diffuses out of the sample reducing the residual dose.

  7. FeAl and NbAl3 Intermetallic-HVOF Coatings: Structure and Properties

    Guilemany, J. M.; Cinca, N.; Dosta, S.; Cano, I. G.

    2009-12-01

    Transition metal aluminides in their coating form are currently being explored in terms of resistance to oxidation and mechanical behavior. This interest in transition metal aluminides is mainly due to the fact that their high Al content makes them attractive for high-temperature applications. This is also a reason to study their resistance to wear; they may be suitable for use in applications that produce a lot of wear in aggressive environments, thus replacing established coating materials. In this study, the microstructure, microhardness, and wear and oxidation performance of FeAl and NbAl3 coatings produced by high-velocity oxy-fuel spraying are evaluated with two main aims: (i) to compare these two coating systems—a commonly studied aluminide (FeAl) and, NbAl3, an aluminide whose deposition by thermal spraying has not been attempted to date—and (ii) to analyze the relationship between their microstructure, composition and properties, and so clarify their wear and oxidation mechanisms. In the present study, the higher hardness of niobium aluminide coatings did not correlate with a higher wear resistance and, finally, although pesting phenomena (disintegration in oxidizing environments) were already known of in bulk niobium aluminides, here their behavior in the coating form is examined. It was shown that such accelerated oxidation was inevitable with respect to the better resistance of FeAl, but further improvements are foreseen by addition of alloying elements in that alloy.

  8. Precipitation and strengthening phenomena in Al-Si-Ge and Al-Cu-Si-Ge alloys

    The objective of this work was to determine whether Al rich Al-Si-Ge and 2000 type Al-Cu-Si-Ge alloys have sufficient hardness to be useful for structural applications. It is shown that in Al-Si-Ge it is not possible to achieve satisfactory hardness through a conventional heat treatment. This result is explained in terms of sluggish precipitation of the diamond-cubic Si-Ge phase coupled with particle coarsening. However, Al-Cu-Si-Ge displayed a uniquely fast aging response, a high peak hardness and a good stability during prolonged aging. The high hardness of the Cu containing alloy is due to the dense and uniform distribution of fine θ' precipitates (metastable Al2Cu) which are heterogeneously nucleated on the Si-Ge particles. High resolution TEM demonstrated that in both alloys all the Si-Ge precipitates start out, and remain multiply twinned throughout the aging treatment. Since the twinned section of the precipitate does not maintain a low index interface with the matrix, the Si-Ge precipitates are equiaxed in morphology. Copyright (2000) AD-TECH - International Foundation for the Advancement of Technology Ltd

  9. X-ray photoelectron spectroscopy and magnetism of AlDyNi, AlDyNi4 and AlDy3Ni8 compounds

    The electronic and magnetic properties of AlDyNi, AlDyNi4 and AlDy3Ni8 are studied using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), static and dynamic magnetic measurements. The three compounds AlDyNi, AlDyNi4 and AlDy3Ni8 are single phases and crystallize in the Fe2P, CaCu5 and CeNi3 structure types, respectively. All the investigated compounds order ferromagnetically below the corresponding Curie temperatures. The Curie temperature and the magnetic moments are 25 K and 6 μB/f.u. for AlDyNi, 14 K and 6.9 μB/f.u. for AlDyNi4 and 22K and 19.2 μB/f.u. for AlDy3Ni8. At high temperature the magnetic susceptibility obey the Curie-Weiss law. The paramagnetic Curie temperature and the effective magnetic moments are 30K and 10.88 μB/f.u. for AlDyNi, 28 K and 10.94 μB/f.u. for AlDyNi4 and 18 K and 18.33 μB/f.u. for AlDy3Ni8. XPS valence band and Ni 2p spectra indicated the presence of small magnetic moment on Ni sites in AlDy3Ni8 and AlDyNi4, and a complete filling of Ni 3d band in AlDyNi.

  10. Diet and dietetics in al-Andalus.

    Salas-Salvadó, Jordi; Huetos-Solano, Maria D; García-Lorda, Pilar; Bulló, Mònica

    2006-08-01

    Al-Andalus society (711-1492) based its idea of health on the wisdom of Classical Greece, the Hippocratic-Galenic theories, as well as the Persian and Hindu cultures. The twelfth century in al-Andalus is considered to be the most prolific period for works of a scientific and technical nature. At the time, the main treatises on dietetics were written and this science reached its widest expression with such leading figures as Ibn Wāfīd, Avenzoar, Averroes and Maimonides, whose works revealed the first scientific knowledge on the nutritional processes of the human body. Diet was regarded as being essential for health and the prevention of disease. Dietary guidelines were written for different age groups, different body types and different seasons of the year. The amount of food to be ingested, the number of meals recommended and the order in which the food should be consumed were all issues that were discussed. A variety of foods were thought to have medicinal properties, some of which are known today. The diet in al-Andalus was varied and very probably made a substantial contribution to the origin of the present-day Mediterranean diet, rich in olive oil, wholemeal cereals, fruit and vegetables, fish, lamb, poultry, nuts and spices. We also find that many of the terms in current use in diet and agriculture are a living testimony to the Arabic influence, as are many of the dishes of our varied Mediterranean gastronomy. PMID:16923240

  11. Keanekaragaman dalam al-Qur’an

    Muhammad Chirzin

    2011-04-01

    Full Text Available The diversity of race, language, class, and culture is a wealth; basically, it is a beautiful gift in this life. However, the reality is precesely the social conflict among the society. This article explores the issue of diversity contained in al Qur’an. Some of the key themes included: diversity as sunnatullah, diversity in unity, religious and ethnic diversity, and diversity of professions. Al Qur’an has mentioned several groups of religious believers and provided guidance association order among religious believers. Religious diversity certainly makes Muslim necessitates acknowledging and respecting other religion save Islam. Al Qur’an has mentioned also a variety of occupations based on interests, talents, expertise, and particular skills. The fragmentation and understanding diversity have caused by egoism and truth claiming of each group and individual, but no one has knowledge covering everything from different sides or corners. Above all knowledge is the Almighty owner off all knowledge. With feeling most true someone or group tends to feel the best and have the right to insult any others. That is the base of the dispute and spiritual decline. Mukmin has to preserve the noble character in association, and keep away from bad manner. Among mukmin must love each other and maintain good manners. Finally, this study is intended to promote the establishment of harmony, peace and happiness of living together.

  12. Sihir dalam Pandangan Al-Qur’an

    Hurmain Hurmain

    2014-06-01

    Full Text Available Sihir adalah perbuatan ajaib yang dilakukan dengan pesona dan kekuatan ajaib (gunaguna, mantra atau jampi yang digunakan untuk tujuan tertentu, seperti penangkal dan mencelakai orang lain. Karena itu sihir bisa menimbulkan dampak beraneka ragam, seperti sakit, kematian, kebencian, gairah syahwat dan penceraian serta perselingkuhan. Dalam Al-Qur’an tidak kurang dari 30 ayat bicara mengenai sihir. Antara lain surat Al-Baqarah ayat 102 yang menjadi fokus telaah ini. Asbabunuzul ayat ini, diatarbelakangi tuduhan kafir Quraisy terhadap Nabi Muhammad saw. bahwa ajaran yang dikembangkan belia itu, adalah sihir, lalu turun ayat 102 Al-Baqarah ini. Dalam ayat ini Allah menceritakan perbuatan sihir orang Yahudi di zaman Nabi Sulaiman. Tujuan mereka memutar balikkan fakta dan pembangkangan terhadap kitab Taurat yang benar. Dan ilmu sihir yang mereka kembangkan, tidak ada relevansinya dengan ajaran Nabi Sulaiman. Mempelajari ilmu sihir menurut sebagian ulama tafsir, adalah boleh yang dilarang menggunakan ilmu itu untuk kejahatan. Menurut para ahli tafsir, ilmu sihir termasuk ilmu yang tercela, merugikan bagi diri si penyihir dan yang terkena sihir. Karena itu kedua belah pihak bisa dikenakan sebagai sikap penolakan kebenaran atau kekafiran.

  13. Thermodynamic properties and mixing thermodynamic parameters of Ba-Al, Mg-Al, Sr-Al and Cu-Al metallic melts

    张鉴

    2004-01-01

    Application of equations of mixing thermodynamic parameters formulated on the basis of the coexistence theory of metallic melts in Ba-Al, Mg-Al, Sr-A1 and Cu-Al melts leads to fruitful results that not only the evaluated mass action concentrations agree well with the measured activities, but also the calculated mixing thermodynamic parameters are quite coincident with the experimental values. Moreover, the calculated mass action concentrations strictly obey the mass action law. The evaluated mixing thermodynamic parameters have very fine regularity: the mixing free energy is composed of standard free formation energies of all compounds and chemical potentials of all structural units at equilibrium; the mixing enthalpy consists of standard formation enthalpies of all compounds; the mixing entropy is composed of standard entropies of all compounds and configuration entropies of all structural units at equilibrium. As the equations of mixing thermodynamic parameters formulated are widely applicable to metallic melts involving compound formation, they can be used as the second practical criterion to determine whether thermodynamic models of metallic melts are correctly formulated.

  14. Treatment of MCrAlY coatings

    The surface of MCrAlY coatings deposited on Inconel were treated by the pulsed electron beam of the GESA installation to improve the oxidation resistance and also the bond strength of thermal barrier coatings (TBC) deposited on the surface. Typical coatings employed for gas turbine blades are employed. The influence of electrons reflected from the surface had to be considered for the calculation of the energy deposition into the material. Due to the magnetic field in the GESA installation these electrons influence the beam current and the energy distribution inside the target. The treated MCrAlY surface shows a much better oxidation resistance because the fine grained structure of the surface layer effects the formation a stable α-Al2O3 scale already in the first stage. The scale grows slowly. Thus, an early spallation is prevented. This results also in a higher life time of the TBC deposited. The TBC is still stable after 5000 h oxidation at 950 C on air, but spalls at another untreated specimen already after 3000 h. Cyclic experiments between 950 C and room temperature show great differences. The untreated specimen spalled after 300 cycles while the treated specimen was still intact after 3000 cycles. (orig.)

  15. Model for metabolic resistance against ALS inhibitors

    Richter, Otto

    2014-02-01

    Full Text Available Due to herbicide selection pressure metabolic resistance has evolved in many weed species. In this paper we analyse the interaction between the branched chain amino acid (BBC pathway and detoxifying pathways for herbicide breakdown. The four phase detoxification pathway of herbicides comprising the action of P450, GST, glycosyltransferase and ABC transporter is modelled by a system of coupled enzyme kinetic reactions represented by nonlinear differential equations. The herbicide under consideration inhibits the enzyme ALS, which is the key enzyme for the biosynthesis of branched amino acids. For the kinetics of ALS a Monod approach is employed with a binding site for the inhibitor. Synthetic and detoxification pathways are coupled. The model is used to study the production of branched amino acids under the action of ALS inhibitors for different structures and modes of action of the detoxification pathway. The model is capable of generating typical dose response curves and their shift in dependence of the activity pattern of the enzymes of the detoxification pathway of the inhibitor.

  16. De la vigilancia convencional al monitoreo participativo

    Jaime Breilh

    2003-01-01

    Full Text Available La necesidad de transformar el monitoreo de la salud de un instrumento funcional al sistema dominante de poder en una herramienta del poder colectivo, y de negociación del desarrollo de la salud laboral y el bienestar, implica la urgente transformación de la vieja vigilancia epidemiológica en un monitoreo participativo. Debe superarse el sistema convencional de información en salud, que observa fundamentalmente los "factores de enfermedad" y sus efectos mórbidos aislados, invisibilizando los procesos de determinación integrales. Este trabajo analiza el proceso de derrota de los derechos sociales y laborales, lo cual sitúa el desafío planteado en un escenario de profundo retroceso social y asalto a los derechos conquistados por los/as trabajadores/as en años de lucha. Con el propósito de esclarecer dicho argumento, al autor comienza contrastando los modelos de vigilancia clásicos, algunas propuestas transicionales, hasta arribar al monitoreo participativo. La aplicación de la categoría "perfil epidemiológico" permite sistematizar los dominios y dimensiones del monitoreo y establecer los sujetos sociales de esa mirada crítica e intercultural del pueblo sobre su salud, mediante la construcción de una matriz de procesos críticos.

  17. Lower motor neuron dysfunction in ALS.

    de Carvalho, Mamede; Swash, Michael

    2016-07-01

    In the motor system there is a complex interplay between cortical structures and spinal cord lower motor neurons (LMN). In this system both inhibitory and excitatory neurons have relevant roles. LMN loss is a marker of motor neuron disease/amyotrophic lateral sclerosis (MND/ALS). Conventional needle electromyography (EMG) does not allow LMN loss to be quantified. Measurement of compound muscle action potential (CMAP) amplitude or area, and the neurophysiological index, provide a surrogate estimate of the number of functional motor units. Increased motor neuronal excitability is a neurophysiological marker of ALS in the context of a suspected clinical and electrophysiological diagnosis. In the LMN system, fasciculation potentials (FPs) are the earliest changes observed in affected muscles, a feature of LMN hyperexcitability. Reinnervation is best investigated by needle EMG although other methods can be explored. Moreover needle EMG give information about the temporal profile of the reinnervation process, important ancillary data. Quantitative motor unit potential analysis is a valuable method of evaluating reinnervation. The importance of FPs has been recognized in the Awaji criteria for the electrodiagnosis of ALS, criteria that are a sensitive adjunct to the revised El Escorial criteria. Finally, functionality of LMN's, and perhaps excitability studies in motor nerves, aids understanding of the disease process, allowing measurement of potential treatment effects in clinical trials. Other investigational techniques, such as electrical impedance myography, muscle and nerve ultrasound, and spinal cord imaging methods may prove useful in future. PMID:27117334

  18. Studies on Al Kidirate and Kapoeta meteorites

    Gismelseed, A.M. [Sudan Atomic Energy Commission, Khartoum (Sudan); Khangi, F. [Sudan Atomic Energy Commission, Khartoum (Sudan); Ibrahim, A. [Sudan Atomic Energy Commission, Khartoum (Sudan); Yousif, A.A. [Coll. of Science, Sultan Qaboos Univ., Alkhoud (Oman); Worthing, M.A. [Coll. of Science, Sultan Qaboos Univ., Alkhoud (Oman); Rais, A. [Coll. of Science, Sultan Qaboos Univ., Alkhoud (Oman); Elzain, M.E. [Coll. of Science, Sultan Qaboos Univ., Alkhoud (Oman); Brooks, C.K. [Coll. of Science, Sultan Qaboos Univ., Alkhoud (Oman); Sutherland, H.H. [Coll. of Science, Sultan Qaboos Univ., Alkhoud (Oman)

    1994-11-01

    Moessbauer spectroscopy (20-300 K), magnetic susceptibility measurements (77-350 K), scanning electron microscopy and X-ray diffraction experiments have been performed on two meteorite samples: one from an old fall (Kapoeta) and another from a very recent fall (Al Kidirate). The two specimens differ in their mineralogy. Chondrules appear to be absent in Kapoeta and it is probably a pyroxene-plagioclase achondrite with ferrohypersthene as the most abundant mineral. On the other hand, the Al Kidirate meteorite is an ordinary chondrite and the specimen consists of olivine, orthopyroxene, troilite and kamacite. The Moessbauer measurements confirm the above characterization, showing a paramagnetic doublet for the Kapoeta sample and at least two paramagnetic doublets and magnetic sextets for the Al Kidirate specimens. The former were assigned to Fe in pyroxene sites, while the latter was assigned to Fe in pyroxene, olivine, Fe-S and Fe-Ni alloys. The difference in the mineralogy of the two meteorites has also been reflected in the temperature-dependent magnetic susceptibility. The magnetization and the hyperfine interaction parameters will be discussed in relation to the mineralogy. (orig.)

  19. Structure analysis of Al cast alloy

    L.A. Dobrzański

    2008-03-01

    Full Text Available Purpose: The developed design methodologies both the material and technological ones will make it possible to improve shortly the quality of materials from the light alloys in the technological process, and the automatic process flow correction will make the production cost reduction possible, and - first of all - to reduce the amount of the waste products.Design/methodology/approach: Castings were analysed in the paper of car engine blocks and heads from the Al-Si-Cu alloys of the AC-AlSi7Cu3Mg type fabricated with the “Cosworth” technological process. In this work the AC-AlSi7Cu3Mg alloy structure was investigated, of this alloy samples were cut of for structure analysis of the cylinder part as well of crankshaft of a fuel engine. The investigation show a difference in the (phase structure morphology as a result of cast cooling rate.Findings: On the quality of casting has influence the walls thickness of car engine elements’.Practical implications: In the metal casting industry, an improvement of component quality depends mainly on better control over the production parameters.Originality/value: The value of the applied methodology was to correct identify the casting effects that occurred during the casting process.

  20. Preparation and characterization of Al11Cr4 phase by diffusion of Al/Cr composite film

    Highlights: • Al11Cr4 was prepared by diffusion of electrodeposited Al/Cr composite film. • The compositional range of Al11Cr4 was from Al75.0Cr25.0 to Al76.0Cr24.0. • The decomposition temperature of Al11Cr4 was 829 °C. - Abstract: Al–Cr alloys were prepared by making Al/Cr composite films go through a low temperature heat treatment. Al/Cr composite films were electrodeposited from aqueous solution and ionic liquid successively. The effects of the composition of Al/Cr composite film on the phase constitutions of Al–Cr alloy were then investigated. The samples were characterized by metallographic microscope (OM), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM) and spherical aberration corrected transmission electron microscope (Cs-TEM). The decomposition temperature of Al–Cr alloy was studied using differential thermal analysis. The results showed that single Al11Cr4 phase can be obtained from the Al/Cr composite film at the composition range of 75.0–76.0 at.% Al. The Al11Cr4 would decompose into Al4Cr and Al8Cr5 at 829 °C

  1. Al-Al2O3 core-shell composite by microwave induced oxidation of aluminium powder

    Microwave processing is gaining importance in the preparation of composite materials mainly because of its predominance in the improvement of uniformity for different phases formed. In the present study, commercial Al powder was heat treated using microwave radiation to synthesize Al-Al2O3 core-shell composite powder. The as received Al powder and the microwave heated Al powders were characterized by X-ray diffractometry (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) analysis and zeta potential measurement. XRD data confirmed the formation of Al-Al2O3 composite. FTIR studies indicated the core-shell type Al-Al2O3 composite formation. SEM observations suggested the formation of Al-Al2O3 core-shell composite. TEM images, corresponding selected area electron diffraction (SAED) patterns and EDX analysis confirmed the Al-Al2O3 core-shell composite development. Zeta potential measurements also indicated that Al core particles were surrounded with Al2O3 shell.

  2. Some Maudu (Fabricated) Narrations in Tafsir Al-Dur Al-Manth‘ur (Sura Al-Nisa of the Holy Quran)

    Nasrullah Khan; Janas Khan; Ziaullah Al-Azhari; Muhammad Ayaz; Abaad ur Rahman; Jannat Naeem Khan; Karim Dad

    2012-01-01

    “Tafseer Al-Dur Al-Man‘thur Fi Tafsir Al-Math‘ur“ is the commentary of the Holy Quran written by Jalal Al-Din Al-Suyuti. He was born in Cairo, Egypt in 849H/1445AH. He was a renowned scholar of his time having mastery in many fields of Islamic Studies like Quran, Hadith, fiqh and history. In the last days of his life, he got isolated himself from all the worldly affairs and concentrated on writing books. He wrote almost in every field of knowledge and authored nearly 600 books. He died in 911...

  3. Reciprocating Wear Behaviour of 7075Al/SiC and 6061Al/Al2O3 Composites: A study of Effect of Reinforcement, Stroke and Load

    J. Lakshmipathy; B. Kulendran

    2014-01-01

    The wear behaviour comparison of Al/SiC and Al/Al2O3 composites prepared by stir casting technique is investigated to find out the effects of weight percentage of SiC/Al2O3, load and the number of strokes on a reciprocating wear testing machine. The MMC pins are prepared with different weight percentage of SiC and Al2O3 (10, 15 and 20 %). The tests are carried out with different load conditions (25, 50 and 75 N) and different number of strokes (420,780 and 1605 strokes). Wear surfaces of test...

  4. Regulation of the Bacillus subtilis alsS, alsD, and alsR genes involved in post-exponential-phase production of acetoin.

    Renna, M C; Najimudin, N.; Winik, L R; Zahler, S A

    1993-01-01

    Acetoin is a major extracellular product of Bacillus subtilis grown on glucose and other fermentable carbon sources. The enzymes responsible for the formation of acetoin, acetolactate synthase, and acetolactate decarboxylase are synthesized in detectable amounts only in cells that have reached stationary phase. We have cloned and sequenced the genes encoding these enzymes, alsS and alsD, as well as a gene, alsR, that regulates their expression. alsS and alsD appear to compose a single operon,...

  5. Studies of Al metabolism in animal by accelerator mass spectrometry

    WangNa-Xiu; ZhuHan-Min; 等

    1997-01-01

    The correlation between Al metabolism and senile dementia in animal has been studied by AMS(accelerator mass spectrometry).Three groups of laboratory rats were fed with normal food.food with high Al content,and with enriched Ca and Mg together with high Al,respectively for six to eight months.Mapping test was made to recored th degree of wisdom degeneration.Half of the rats were sacrificed and Al contents in various organs were measured by atomic absorption spectroscopy.The rest were injected with 26Al,killed after 5,10,15,25,and 35d and 26Al contents measured by AMS.The distribution of Al as well as the correlation among the accumulation of 26Al,and the existed Al content and dementia was studied.

  6. The Calculation of Fe-Al-O Interaction Coefficient

    Aluminum is a very common deoxidizer in steel-making processes. The solubility of oxygen in molten iron decreases with increasing aluminum content. For the deoxidation process, the solubility of oxygen in Fe-Al melts decreases with increasing aluminum content. When %Al is increased to 0.34 wt.%, %O decreases to 6.4 ppm, which is the lowest point of the FeAl2O4 curve. Then the Al2O3 curve appears and replaces the FeAl2O4 curve, where the interconnection point of the two curves is the coexistence point of FeAl2O4 and Al2O3 phases. When %Al is increased to 0.4%, the %O decreases to 6.35 ppm, which is the lowest point of the Al2O3 curve. The solubility of oxygen in Fe-Al alloys is about 6.35 ppm with 0.4 wt.% aluminum at 1873 K. Liquid FeO-Al2O3, hercynite (FeAl2O4), and alumina (Al2O3) are three possible products during the deoxidation process. Based on thermodynamic calculation, the value of the interaction coefficient of eoAl was determined as -0.75 at 1873 K. This value is in good agreement with experimental curves in the literature.

  7. Aspectos biopsicosociales asociados al embarazo adolescente

    Regina Cogollo Jiménez

    2012-12-01

    Full Text Available Introducción: El embarazo en la adolescencia, es un evento inesperado, sorpresivo. Este artículo establece la importancia de identificar los aspectos biopsicosociales asociados al embarazo adolescente en las embarazadas asistentes al programa de Control Prenatal de una Empresa Social del Estado de nivel 1 en Montería en 2009, para comprender las actitudes y los comportamientos asociados a esta etapa tan temprana. Materiales y Métodos: Es un estudio descriptivo, cuantitativo, de corte transversal. Población y muestra: 30 adolescentes embarazadas asistentes al Programa, el muestreo por conveniencia. Se utilizó la encuesta y la observación directa, previa autorización del Director de la empresa. Resultados: Caracterización de la población: predominó la edad de 15 a 19 años (adolescencia tardía, uniones libres, baja escolaridad debido a la deserción escolar, ingreso económico menor al salario mínimo legal vigente. Aspectos Biológicos: la menarquía a temprana edad (9 a 14 años, y en ella la mitad de los embarazos. La mayoría de los segundos embarazos terminaron en parto, la minoría en cesárea y aborto. La captación para los controles prenatales fue tardía, algunas no cumplieron con las citas programadas. Aspectos Psicológicos: inestabilidad con la pareja al enterarse del embarazo, tuvieron soporte familiar moral y económico, abandonaron sus estudios y presentaron malestares como estrés, depresión y tristeza. Aspectos Sociales: predominó la convivencia con la familia extensa. Hubo aceptación en el colegio y en los amigos. Discusión y Conclusiones: Se plantean estrategias para disminuir estos aspectos: elaboración de una cartilla sobre “Cuidado de la adolescente embarazada”, creación de espacios de reflexión, jornadas lúdicas educativas, entre otros. (Rev Cuid 2012; 3(3:385-93.Palabras clave: Embarazo en Adolescencia, Bienestar Materno, Atención Prenatal. (Fuente: De

  8. Enhanced Light Extraction in AlInGaN UV Light-Emitting Diodes by an Embedded AlN/AlGaN Distributed Bragg Reflector

    A novel kind of AlInGaN ultraviolet (UV) light-emitting diode (LED) with an embedded AlN/Al0.3Ga0.7N distributed Bragg reflector (DBR) is proposed to enhance light extraction efficiency (LEE). The simulation technique we adopt to calculate the LEE of LEDs is based on the theory of spontaneous emission in a layered medium, the well-known mode-matching technique and the scattering matrix approach. The AlN/Al0.3Ga0.7N DBR was intentionally designed to have peak reflectivity at the LED emission wavelength and the optical properties of the DBR were simulated by using the transfer matrix method. A high LEE of 45.7% at 370 nm wavelength was predicted for a proposed AlInGaN UV LED consisting of 24 periods of the AlN/Al0.3Ga0.7N DBR, which is 1.5 times of that of the conventional AlInGaN UV LED. The investigation shows that the AlN/Al0.3Ga0.7N DBR grown on GaN templates with sapphire as a substrate by MOCVD can enhance the LEE effectively and would be very promising for the fabrication of high performance GaN-based UV LEDs

  9. Effects of Al content on structure and mechanical properties of hot-rolled ZrTiAlV alloys

    Highlights: • Phase structure is greatly dependent on the Al content. • Intermetallic compound will precipitates while Al content is over 6.9 wt%. • Equiaxed α-phase grains present in the hot-rolled alloy with 6.9 wt% Al. • Alloys with Al content from 3.3 wt% to 5.6 wt% have good mechanical properties. - Abstract: Zirconium alloys show attractive properties for astronautic applications where the most important factors are anti-irradiation, corrosion resistance, anti-oxidant, very good strength-to-weight ratio. The effects of Al content (2.2–6.9 wt%) on structure and mechanical properties of the hot-rolled ZrTiAlV alloy samples were investigated in this study. Each sample of the hot-rolled ZrTiAlV alloys with Al contents from 2.2 wt% to 5.6 wt% is composed of the α phase and β phase, meanwhile, the relative content of the α phase increased with the Al content. However, the (ZrTi)3Al intermetallic compound was observed as the Al content increased to 6.9 wt%. Changes of phase compositions and structure with Al content distinctly affected mechanical properties of ZrTiAlV alloys. Yield strength of the alloy with 2.2 wt% Al is below 200 MPa. As Al content increased to 5.6 wt%, the yield strength, tensile strength and elongation of the examined alloy are 1088 MPa, 1256 MPa and 8%, respectively. As Al content further increased to 6.9 wt%, a rapid decrease in ductility was observed as soon as the (ZrTi)3Al intermetallic compound precipitated. Results show that the ZrTiAlV alloys with Al contents between 3.3 wt% and 5.6 wt% have excellent mechanical properties

  10. Chemical ordering and large tunnel magnetoresistance in Co2FeAl/MgAl2O4/Co2FeAl(001) junctions

    Scheike, Thomas; Sukegawa, Hiroaki; Inomata, Koichiro; Ohkubo, Tadakatsu; Hono, Kazuhiro; Mitani, Seiji

    2016-05-01

    Epitaxial magnetic tunnel junctions (MTJs) with a Co2FeAl/CoFe (0.5 nm)/MgAl2O4/Co2FeAl(001) structure were fabricated by magnetron sputtering. High-temperature in situ annealing led to a high degree of B2-order in the Co2FeAl layers and cation order of the MgAl2O4 barrier. Large tunnel magnetoresistance (TMR) of up to 342% was obtained at room temperature (616% at 4 K), in contrast to the TMR ratio ( ≲ 160%) suppressed by the band-folding effect in Fe/cation-ordered MgAl2O4/Fe MTJs. The present study reveals that the high degree of B2-order and the resulting high spin polarization in the Co2FeAl electrodes enable us to bypass the band-folding problem in spinel barriers.

  11. Liquidus temperatures of Na3AlF6-AlF3-CaF2-KF-LiF-Al2O3 melts

    Peng J.P.; Di Y.Z.; Wang Y.W.; Bai Y.B.; Feng N.X.

    2014-01-01

    Temperatures for the primary crystallization of Na3AlF6-AlF3-CaF2-KF-LiF-Al2O3 system adopted in aluminum electrolysis process were determined by thermal analysis. An empirical equation was derived to describe the liquidus temperatures for the primary crystallization of this multicomponent electrolyte system: t/℃=1011 + 0.7w(AlF3) - 0.232w(AlF3)2 - 7.65w(Al2O3) + 0.523w(Al2O3)2 - 8.96w(LiF) + 0.043w(LiF)2 - 3.32w(KF) - 0.12w(KF)2 - 3.28w(CaF2) +0.037w(CaF2)2 + 0.09...

  12. Spatial and temporal mapping of Al and AlO during oxidation in pulsed laser ablation of LaAlO3

    We present the first spatio-temporal mapping of two simultaneously present species in a plasma used for pulsed laser deposition. We apply laser induced fluorescence spectroscopy (LIF) to map ground state populations of Al and AlO in plasma plumes generated by ablation of LaAlO3 in an O2 or Ar atmosphere. Around a specific distance from the target, we observe Al vanish simultaneously with the turnup of AlO. This can be assigned to the oxidation of Al in the background atmosphere occurring after a sufficient slowing of the expanding Al front. This is consistent with the absence of such effects when argon is taken as background. A quantitative evaluation of data promises to reveal important dynamical reaction and deposition parameters for identification of the origin of specific properties of PLD grown films such as 2-dimensional conductive interfaces

  13. Deutsch als "leicht zu erlernende Fremdsprache"

    Kurtz, Gunde

    2005-01-01

    Full Text Available The goal of this paper is to encourage the search for accessible language features and teaching and learning facilitators which can ease the way into German as a Foreign Language (DaF.The paper begins with a terminological discussion, followed by a first model of the most important factors concerning the initial entry into FL territory. After a short review on previous work in this area, I consider methods for utilising knowledge of accessible language features and teaching and learning facilitators. Finally, suspected facilitating features - which have come to light through research as well as classroom observations – are exemplified. These, however, are to be understood as working hypotheses and thus still 'under construction'.Through this paper, I would like to invite other researchers to consider a new perspective on DaF with the intention of changing the status quo:"Applied linguistics is not simply a matter of matching up findings about language with pre-existing problems but of using findings to explore how the perception of problems might be changed. It may be that when problems are reformulated from a different point of view they become more amenable to solution. This changed perception may then, in turn, have implications for linguistics." (Cook : 2003: 10My goal will have been achieved when the focus of this paper becomes a motivation for improving DaF teaching ("problems [...] become more amenable to solution" - and, should it lead to "implications for linguistics", so much the better.Ziel dieses Beitrages ist, eine umfassende Suche nach leichten Stellen und Erleichterungen beim Zugang zum Deutschen als fremder Sprache anzuregen.Nach Begriffsklärung und einem ersten Vorschlag zu den für die Zugänglichkeit einer Sprache ausschlaggebenden Faktoren (1 sowie einem kurzen Überblick über Fundstücke zum Thema (2 steht die Rolle der praktischen Umsetzung von Erkenntnissen als Hauptinstrument für den Bereich der Erleichterungen und

  14. Mechanism and kinetics analysis of AlN combustion synthesis

    郑永挺; 张宇民; 赫晓东; 刘长青

    2004-01-01

    Mechanism of AlN combustion synthesis was studied by DSC analysis and "quenching" experiment of combustion wave. In preheating region, Al powder melted at 660 ℃ and became spherical because of surface tension. In reaction region, Al volatilized rapidly at 1 000 ℃ and Al vapor reacted with N2 to form AlN, which nucleated and grew on the surface of AlN formed precedently as a diluent. Based on the experiment analysis,kinetics equations and modeling were established. Analysis showed the dramatic effect of temperature, aluminum particle size and nitrogen pressure on the reaction speed.

  15. Accelerated corrosion behaviors of Zn, Al and Zn/15Al coatings on a steel surface: Pospešeno korozijsko obnašanje Zn, Al in Zn/15Al prekritij na površini jekla:

    Cevher, Ozgur; Gulec, Ahmet; Turk, Ahmet; Ustel, Fatih; Yilmaz, Fevzi

    2011-01-01

    Zn, Al and Zn/15Al coatings can be produced in optimum conditions by the twin wire arc (TWEA) spraying technique. The coatings are used for corrosion protection in a variety of industrial applications. In this study, the accelerated corrosion behavior of Zn, Al and Zn/15Al coatings on a steel surface during the salt-spray testing period was investigated. The surfaces ofsteel coupons were coated with Zn, Al and Zn/15Al using the TWEA spray-deposition system. The corrosion test was performed in...

  16. Corrosion behaviour of Al/Al3Ti and Al/Al3Zr functionally graded materials produced by centrifugal solid-particle method: Influence of the intermetallics volume fraction

    Ferreira, S. C.; L. A. Rocha; Ariza, E.; Sequeira, P. D.; WATANABE, Yoshimi; Fernandes, J. C. S.

    2011-01-01

    Intermetallic particles, Al3Ti and Al3Zr were formed in Al–5mass%Ti and Al–5mass%Zr alloys, respectively, by centrifugal casting, in order to create functionally graded materials (FGMs). At present, no information is available on the influence of the amount of intermetallics on the electrochemical properties of these alloys. In this paper, the corrosion resistance of Al/Al3Ti and Al/Al3Zr FGMs was investigated by open-circuit measurements, potentiodynamic polarization and electrochemical ...

  17. Al-Ca and Al-Fe metal-metal composite strength, conductivity, and microstructure relationships

    Kim, Hyong June [Iowa State Univ., Ames, IA (United States)

    2011-01-01

    Deformation processed metal-metal composites (DMMC’s) are composites formed by mechanical working (i.e., rolling, swaging, or wire drawing) of two-phase, ductile metal mixtures. Since both the matrix and reinforcing phase are ductile metals, the composites can be heavily deformed to reduce the thickness and spacing of the two phases. Recent studies have shown that heavily drawn DMMCs can achieve anomalously high strength and outstanding combinations of strength and conductivity. In this study, Al-Fe wire composite with 0.07, 0.1, and 0.2 volume fractions of Fe filaments and Al-Ca wire composite with 0.03, 0.06, and 0.09 volume fractions of Ca filaments were produced in situ, and their mechanical properties were measured as a function of deformation true strain. The Al-Fe composites displayed limited deformation of the Fe phase even at high true strains, resulting in little strengthening effect in those composites. Al-9vol%Ca wire was deformed to a deformation true strain of 13.76. The resulting Ca second-phase filaments were deformed to thicknesses on the order of one micrometer. The ultimate tensile strength increased exponentially with increasing deformation true strain, reaching a value of 197 MPa at a true strain of 13.76. This value is 2.5 times higher than the value predicted by the rule of mixtures. A quantitative relationship between UTS and deformation true strain was determined. X-ray diffraction data on transformation of Al + Ca microstructures to Al + various Al-Ca intermetallic compounds were obtained at the Advanced Photon Source at Argonne National Laboratory. Electrical conductivity was measured over a range of true strains and post-deformation heat treatment schedules.

  18. Ibn al-ʻArabī and Abū Yazīd al-Bistāmī

    ABRAHAMOV, Binyamin

    2011-01-01

    Many Sufis appear in Ibn al-‛Arabī’s al-Futūhāt al-Makkiyya, a treatise in which the author puts forward his principal ideas. Abū Yazīd al-Bistāmī is mentioned in this work 143 times, more than any other Sufi. The present article seeks to examine Ibn al-‛Arabī’s attitude toward his Sufi predecessor by considering al-Bistāmi’s personality as it appears in Ibn al-‛Arabī, as well as Ibn al-‛Arabī’s views on al-Bistāmī’s Sufi practice, his presence as a model of moral conduct a...

  19. Fabrication and Properties of AlON Ceramics%AlON陶瓷的制备及性能

    裴新美

    2001-01-01

    以Al粉和Al2O3为原料,用铝粉氮化反应烧结技术(RBAN)制备AlON 陶瓷.氮化产物为纳米尺度的AlN相,AlN纳米晶的高活性使得在1 600 ℃即合成了AlON相,该温度低于相图显示的合成温度(1 700 ℃).新生的细晶AlON相有利于低温烧结,1 750 ℃制备出致密的AlON、Al2O3-AlON陶瓷.

  20. Relationship between the growth rate and Al incorporation of AlGaN by metalorganic chemical vapor deposition

    Deng, Y. [State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China); Zhao, D.G., E-mail: dgzhao@red.semi.ac.cn [State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China); Le, L.C.; Jiang, D.S.; Wu, L.L.; Zhu, J.J.; Wang, H.; Liu, Z.S.; Zhang, S.M. [State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China); Yang, Hui [State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China); Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215125 (China); Liang, J.W. [State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China)

    2011-01-21

    Research highlights: The growth rate and its relationship with Al content of MOCVD-grown AlGaN alloy films are investigated. It is found that both parasitic reaction and competitive adsorption play important roles in determining the growth rate and Al incorporation in AlGaN. Low reactor pressure and a decrease of absolute amount of Ga atoms arriving on the substrate may lead to a higher Al content in AlGaN film. The research results are helpful to control the Al content of AlGaN during the materials growth. - Abstract: The growth rate and its relationship with growth conditions of AlGaN alloy films by metalorganic chemical vapor deposition (MOCVD) are investigated. It is found that both parasitic reaction and competitive adsorption play important roles in determining the growth rate and Al incorporation in AlGaN. Low reactor pressure can weaken parasitic reactions, thus increasing the Al composition. In addition, a decrease of absolute amount of Ga atoms arriving on the substrate may lead to a lower Ga competitive power, and then a higher Al content in AlGaN film.

  1. Urchin-like AlOOH nanostructures on Al microspheres grown via in-situ oxide template

    Xu, Jiaquan [Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095 (United States); Estruga, Marc [Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706 (United States); Chen, Lianyi [Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA 90095 (United States); Yahata, Brennan [Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095 (United States); Choi, Hongseok [Department of Mechanical Engineering, Clemson University, Clemson, SC 29634 (United States); Li, Xiaochun, E-mail: xcli@seas.ucla.edu [Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA 90095 (United States)

    2014-10-15

    Highlights: • We present a simple, scalable method to grow urchin-like AlOOH on Al microspheres. • Al{sub 2}O{sub 3} nanoparticles from the native oxide films and self-assemble to form templates. • Urchin-like nanostructures spontaneously form and growth on the Al{sub 2}O{sub 3} templates. - Abstract: Three dimensional (3D) metal oxide hydroxide nanostructures are highly desirable for numerous applications. Here, we present a simple, scalable method to grow urchin-like AlOOH nanostructures on the surface of Al microspheres. Al nanoparticles with native oxide film were melted in molten salts, forming an immiscible materials system. During ultrasonic processing of the mixture, emulsion of micro Al droplets occurs and Al{sub 2}O{sub 3} nanoparticles form from the native oxide films and self-assemble to form in-situ nanostructured templates on the surfaces of Al microspheres. When the solidified mixture of Al spheres and salt is exposed to water, urchin-like nanostructures spontaneously form on the Al microspheres due to a heterogeneous nucleation and growth of γ-AlOOH on the Al{sub 2}O{sub 3} templates. This work could be readily extended to other metals, providing a novel and scalable method for the fabrication of urchin-like metal oxide hydroxide nanostructures on metal microspheres.

  2. As-cast microstructure of Al-Zn-Mg and Al-Zn-Mg-Cu alloys added erbium

    MAO Jian-wei; JIN Tou-nan; XU Guo-fu; NIE Zuo-ren

    2005-01-01

    The effects of different contents of rare earth element, and erbium, on the as-cast microstructures of Al-6Zn-2Mg and Al-6Zn-2Mg-1.8Cu alloys were studied by optical microscopy, scanning electron microscopy, X-ray diffractometry, transmission electron microscopy and EDS analysis. The results show that the netlike structure of as-cast alloys can be remarkably refined, and the distance of dendritic structure decreases, with Er addition. However, the improvement results on Al-Zn-Mg-Cu are not better than that of Al-Zn-Mg. Er and Al can interact to form Al3Er phase, which is coherent with α(Al) matrix, with trace Er addition to the Al-Zn-Mg alloy. The refinement effect of Al-Zn-Mg alloys is familiar with the formation and precipitation of coherent Al3Er phases. The ternary compound AlCuEr, similar with AlCuSc phase, will form when Er is added to Al-Zn-Mg-Cu alloy, which suppresses the formation of Al3Er phase and doesn't solve in the following heat treatment.

  3. Effect of Al content on r-value and recrystallization texture of B-bearing Al-killed steel sheets

    Funakawa, Y.; Inazumi, I.; Hosoya, Y. [NKK Corp., Hiroshima (Japan). Mater. and Process. Res. Center; Murayama, T.

    1998-10-01

    It has been demonstrated that boron (B) had a beneficial effect on the mechanical properties of continuously annealed Al-killed steel sheets. However, the effect of Al content on r-value in the B-bearing steels has not been well discussed yet. In this study, the effect of Al content on r-value and recrystallization texture formation was investigated for laboratory-melt B-bearing low C Al-killed steel sheets. The r-value of continuously annealed B-bearing steel increased with decreasing Al content under the same grain size. In the steels with lower Al (Al=0.005%) content, the carbide coarsening in hot-rolled sheet was more significant as compared to those with higher Al(Al=0.055%) content. The recrystallization temperature was lowered with decreasing Al content, and the development of left angle 111 right angle //ND components was accelerated while that of left angle 110 right angle //ND components was retarded. Since the increase in Al content accelerates AlN precipitation in hot-rolled sheets, B might remain as in solution and segregate to grain boundaries. On the other hand, the reduction in Al content causes preferential precipitation of BN in hot-rolled sheets. The improvement of r-value by reducing Al content in B-bearing low C steels was caused by the development of left angle 111 right angle //ND components which reduced by solute B. (orig.) 9 refs.

  4. Transplacental passage of 26Al from pregnant rats to fetuses and 26Al transfer through maternal milk to suckling rats

    Aluminium (Al) is toxic to the growth of fetuses and sucklings. However, the incorporation of Al into fetuses and sucklings in the periods of gestation and lactation has not been well clarified because Al lacks a suitable isotope for a tracer experiment. In this study, we used 26Al (a radioisotope of Al with half-life of 716,000 yr) as a tracer, and measured 26Al incorporation into fetuses and sucklings by accelerator mass spectrometry (AMS). To investigate Al incorporation into fetuses through transplacental passage, 26Al (26AlCl3) was subcutaneously injected into pregnant rats on day 15 of gestation. 26Al was also subcutaneoulsy injected into lactating rats from day 1 to day 20 postpartum. By day 20 of gestation, 0.2% of the 26Al injected into a pregnant rat had been transferred to the fetuses, and 26Al was detected in the brain and liver of the fetuses. On day 9 postpartum, high levels of 26Al were demonstrated in the brain, liver, kidneys and blood of suckling rats. It is concluded that 26Al subcutaneously injected into pregnant rats and/or lactating rats is incorporated into their offspring through transplacental passage and/or maternal milk

  5. Refining Effect of Boron on Hypoeutectic Al-Si Alloys

    2000-01-01

    @@Several concepts of the grain refinement mechanism of B on hypoeutectic Al-Si alloys have been adopted: the refining effect of B on the α-Al and eutectic Si with the different additions of Al-B master alloys made at 850℃ was investigated; and the Al-B master alloys formed under different temperature conditions have been studied to explore the morphologies of AlB2 particles;slowly cooled sample with addition of Al-B was made to explore the refinement mechanism. AlB master alloy can refine not only α-Al, but eutectic Si. Theoretical analysis indicates that,although AlB2 does not take part directly in the nucleation process in pure Al in the presence of Si, it provides a substrate for precipitation of a small content of Si from which α-Al will grow without any undercooling. When the temperature decreases to eutectic line, AlB2 subsequently nucleates eutectic Si; AlB2 particles appear in two different morphologies, namely, hexagonal platelet and tetradehedron morphology which depend on the processing temperature conditions.

  6. Hot Corrosion Performance of AlO-CrO/NiCoCrAlYTa and AlO/NiCoCrAlYTa Coatings Deposited by Atmospheric Plasma Spraying

    Tao, Chong; Wang, Lei; Cheng, Nailiang; Hu, Hengfa; Liu, Yang; Song, Xiu

    2016-04-01

    AlO-CrO/NiCoCrAlYTa and AlO/NiCoCrAlYTa coatings were deposited on 316L stainless steel substrate using atmospheric plasma spraying, respectively, in order to improve the oxidation and corrosion resistance. The hot corrosion performance of the coatings at 700 and 900 °C were studied, and the detailed microstructures and phase composition of the coatings were analyzed using x-ray diffraction, scanning electron microscope with energy dispersive spectrometer, and transmission electron microscope. The results show that both coatings are structurally featured by slatted layers, consisting of amorphous phase, Cr2O3, Ni3Al, and Al2O3. The hot corrosion resistance of AlO-CrO/NiCoCrAlYTa coating is better than that of AlO/NiCoCrAlYTa coating. This improvement is attributed to lower porosity and more compact Cr2O3 in AlO-CrO/NiCoCrAlYTa coating which performs better than Al2O3 in blocking further inward progress of corrosion and oxidization.

  7. Effect of silicon on oxidation of Ni-15Al alloy

    WU Ying; NIU Yan; WU Wei-tao

    2005-01-01

    The oxidation of binary Ni-Al alloy containing 15% (mole fraction, the same below if not mentioned)Al (Ni-15Al), and of a ternary alloy with the same Al content but also containing 4% Si (Ni-4Si-15Al) has been studied at 1 000 ℃ under 1.0× 105Pa O2 to examine the effect of the addition of Si on the oxidation of Ni-15Al. Oxidation of Ni-15Al produces a duplex scale composed of an outer NiO layer and an inner layer riched in Al2O3. On the contrary, Ni-4Si-15Al forms an external alumina layer directly in contact with the alloy presenting only trace of NiO and the Ni-Al spinel. As a result, the kinetics of Ni-15Al shows a fast initial stage followed by two subsequent parabolic stages with decreasing rate constants, while Ni-4Si-15Al presents essentially a single nearly-parabolic behavior with a rate constant similar to that of the final stage of Ni-15Al. Therefore, the addition of 4% Si significantly reduces the oxidation rate during the initial stage by preventing the formation of Ni-riched scales and promoting an earlier development of an exclusive external alumina layer on the alloy surface.

  8. Micro-structural evaluation of Ti/Al/Ni/Au ohmic contacts with different Ti/Al thicknesses in AlGaN/GaN HEMTs

    Mahajan, Somna S., E-mail: somnamahajan@gmail.com; Dhaul, Anuradha; Laishram, Robert; Kapoor, Sonalee; Vinayak, Seema; Sehgal, B.K.

    2014-04-01

    Highlights: • Ohmic contacts with four different Ti/Al metal thickness ratios were fabricated on undoped Al{sub .28}Ga{sub .72}N/GaN HEMT under various annealing cycles using Rapid thermal processor. • Ohmic contact with Ti/Al metal thickness ratio, 1/5 showed superior quality in terms of R{sub c} and surface morphology. • Ni–Al alloy segregation on the surface as analyzed by EDAX seems to be related to bumpy surface morphology. • Ohmic contact with Ti/Al metal ratio 1/5 showed the presence of TiN by X-ray diffraction analysis. This was further confirmed by SIMS analysis. • The lower level of elemental Ti and Al at the surface of the contact with Ti/Al metal thickness ratio 1/5 compared to the other contacts indicated lower oxidation possibility and therefore superior quality ohmic contacts with the metal ratio 1/5. - Abstract: In this work, ohmic contacts were formed by varying the Ti/Al thickness ratio in the metal stack of Ti/Al/Ni/Au on Al{sub .28}Ga{sub .72}N/GaN HEMT epistructure followed by annealing in the temperature range 740–860 °C by rapid thermal processor (RTP). The contacts were electrically characterized for contact resistance (R{sub c}) and the sheet resistance (R{sub s}) of AlGaN/GaN epistructure. The ohmic contacts formed by Ti/Al metal thickness ratio of 1/5 exhibited lowest R{sub c} values and better surface morphology compared to the contacts formed by other Ti/Al metal thickness ratios. The difference observed in the electrical characterization of these contacts was correlated with their X-ray diffraction (XRD) and secondary ion mass spectroscopy (SIMS) analyses. The surface morphology of the ohmic metal post annealing showed two distinct regions in scanning electron microscope (SEM) images. The energy dispersive X-ray analysis (EDAX) identified these regions as Ni–Al and Au–Al rich. Ni–Al rich region is believed to be responsible for rough morphology. Further, the contact formed with Ti/Al metal thickness ratio 1

  9. Creep strength of centrifugally cast Al-rich TiAl alloys

    Sturm, D., E-mail: daniel.sturm@masch-bau.uni-magdeburg.de [Otto-von-Guericke-Universitaet Magdeburg, Institut fuer Werkstoff- und Fuegetechnik, Lehrstuhl Werkstoffprueftechnik, Postfach 4120, D-39016 Magdeburg (Germany); Heilmaier, M.; Saage, H. [Otto-von-Guericke-Universitaet Magdeburg, Institut fuer Werkstoff- und Fuegetechnik, Lehrstuhl Werkstoffprueftechnik, Postfach 4120, D-39016 Magdeburg (Germany); Paninski, M.; Schmitz, G.J.; Drevermann, A. [ACCESS e.V., Intzestrasse 5, D-52072 Aachen (Germany); Palm, M.; Stein, F.; Engberding, N. [Max-Planck-Institut fuer Eisenforschung GmbH, Max-Planck-Str. 1, D-40237 Duesseldorf (Germany); Kelm, K.; Irsen, S. [Stiftung Caesar, Electron Microscopy, Ludwig-Erhard-Allee 2, 53175 Bonn (Germany)

    2009-06-15

    High-temperature creep of a binary Al{sub 60}Ti{sub 40} (at.%) alloy in the as-cast state and after annealing at 1223 K for 200 h which produced nearly lamellar {gamma}-TiAl + r-Al{sub 2}Ti microstructure was studied utilizing creep compression tests in a temperature range between 1173 and 1323 K in air. The material was manufactured by centrifugal casting. Microstructural characterization was carried out employing light-optical scanning (SEM) and transmission electron microscopy (TEM) as well as X-ray diffraction (XRD) analyses. It is shown that the alloy exhibits reasonable creep resistance at 1173 K, especially in relation to its low density of around 3.8 g/cm{sup 3}. Stress exponents calculated as n = {Delta}log (strain rate)/{Delta}log (stress) = 4 were found to be relatively constant for the temperature and stress regime investigated. This indicates that dislocation climb may be the rate controlling creep mechanism. The assessment of creep tests conducted at identical stress levels and varying temperatures yielded activation energies for creep of around Q = 457 kJ/mol in the as-cast condition. This value is significantly higher than those found in literature for interdiffusion of Al or Ti in {gamma}-TiAl. It is concluded that the difference is a due to the instability of the microstructure of the as-cast multi-phase alloy.

  10. Radiation damage during HRTEM studies in pure Al and Al alloys

    Mingler, B.; H. Peter Karnthaler [Univ. of Vienna (Austria). Inst. of Materials Physics

    2006-07-15

    During transmission electron microscopy (TEM) investigations of Al alloys, defects caused by the electron irradiation can occur. Since the image contrast of these irradiation defects is similar to that of early stages of precipitates, care is needed to avoid confusion. In the present paper the formation and the coarsening of radiation damage defects were studied by in situ TEM in both, pure Al and Al alloys. High-resolution (HR)TEM images show on an atomic level that the radiation defects are extrinsic Frank loops (some converted into unfaulted prismatic loops); they are distributed homogeneously within the TEM foil but inhomogeneously on the four {l_brace}111{r_brace} planes. Applying HRTEM imaging conditions, the minimum electron energy causing defects is found to be as low as 110 keV using a [110] beam direction. The results for pure Al are very similar to those of the Al alloys. Therefore, during HRTEM studies (using accelerating voltages > 100 kV) the formation of radiation defects seems inevitable; they can be distinguished from the early stages of precipitates if they lie on different planes. (orig.)

  11. Radiation damage during HRTEM studies in pure Al and Al alloys

    During transmission electron microscopy (TEM) investigations of Al alloys, defects caused by the electron irradiation can occur. Since the image contrast of these irradiation defects is similar to that of early stages of precipitates, care is needed to avoid confusion. In the present paper the formation and the coarsening of radiation damage defects were studied by in situ TEM in both, pure Al and Al alloys. High-resolution (HR)TEM images show on an atomic level that the radiation defects are extrinsic Frank loops (some converted into unfaulted prismatic loops); they are distributed homogeneously within the TEM foil but inhomogeneously on the four {111} planes. Applying HRTEM imaging conditions, the minimum electron energy causing defects is found to be as low as 110 keV using a [110] beam direction. The results for pure Al are very similar to those of the Al alloys. Therefore, during HRTEM studies (using accelerating voltages > 100 kV) the formation of radiation defects seems inevitable; they can be distinguished from the early stages of precipitates if they lie on different planes. (orig.)

  12. Deep SiO2 etching with Al and AlN masks for MEMS devices

    Bliznetsov, Vladimir; Mao Lin, Hua; Zhang, Yue Jia; Johnson, David

    2015-08-01

    Silicon oxide-based materials such as quartz and silica are widely used in microelectromechanical systems (MEMS). One way to enhance the capability of their deep plasma etching is to increase selectivity by the use of hard masks. Although this approach was studied previously, information on the use of hard masks for the etching of silicon-oxide based materials on 200 mm substrates is scarce. We present the results of etching process development for amorphous silicon oxide using Al and AlN masks with a view of the application of the results for the etching of silica and quartz. Three gas chemistries (C4F8/O2, CF4 and SF6) and their mixtures were compared in an industrial reactive ion etch (RIE) chamber with two plasma sources. It was established that pure SF6 is the best etchant and AlN is a better mask than Al for providing higher selectivity and a sidewall angle close to vertical. A range of etching parameters for micromasking-free etching was established and etched structures of up to a 4 : 1 aspect ratio were created in 21 μm-thick oxide using the process with an etch rate of 0.32-0.36 μm min-1 and a selectivity to AlN mask of (38-49) : 1.

  13. Tribological Properties of Ti(Al,O)/Al2O3 Composite Coating by Thermal Spraying

    Salman, Asma; Gabbitas, Brian; Cao, Peng; Zhang, Deliang

    The use of thermal spray coatings provides protection to the surfaces operating in severe environments. The main goal of the current work is to investigate the possibility of using a high velocity air fuel (HVAF) thermally sprayed wear resistant Ti(Al,O)/Al2O3 coating on tool steel (H13) which is used for making dies for aluminium high pressure die casting and dummy blocks aluminium extrusion. A feedstock of Ti(Al,O)/Al2O3 composite powder was produced from a mixture of Al and TiO2 powders by high energy mechanical milling, followed by a thermal reaction process. The feedstock was then thermally sprayed using a high velocity air-fuel (HVAF) technique onto H13 steel substrates to produce a composite coating. The present study describes and compares the tribological properties such as friction and sliding wear rate of the coating both at room and high temperature (700°C). The wear resistance of the coating was investigated by a tribometer using a spherical ended alumina pin as a counter body under dry and lubricating conditions. The results showed that composite coating has lower wear rate at high temperature than at room temperature without using lubricant. The composite coating was characterized using scanning electron microscopy (SEM), optical microscopy and X-ray diffractometry (XRD). This paper reports the experimental observations and discusses the wear resistance performance of the coatings at room and high temperatures.

  14. Properties of an AlGaN/AlN distributed-Bragg-reflector structure

    An AlGaN/AlN distributed-Bragg-reflector (DBR) structure with a high Al content was grown by using plasma-assisted molecular beam epitaxy (PA-MBE). The properties of the sample were characterized by using the transmission electron microscopy, high-resolution X-ray diffraction, atomic force microscopy, and reflectivity spectrum measurements. The reciprocal space mapping analysis indicated that the strain in the AlGaN layers was partially relaxed. The morphology of the DBR exhibited a surface covered by grains (average size of about 130 nm), and the surface roughness was about 2 nm. The spectral measurements showed that the DBR structure presented a peak reflectivity of 68.8% at the center wavelength of 247 nm, which indicated that this DBR structure could work in the deep solar-blind UV region with acceptable reflectivity. However, the optical properties of the DBR structure were deteriorated by the fluctuation of the Al composition, non-uniformity of the layer thickness, the blurry, rough interface in the DBR structure, and so on.

  15. Formation of Nb3Al in powder processed Nb-Al superconductors

    In high magnetic fields, the critical current density is strongly dependent on the upper critical field, which is determined primarily by the stoichiometry of the Nb3Al. The critical temperature (T/sub c/), like the upper critical field, is considered to be a measure of the ''intrinsic'' quality of the superconductor, indicating the stoichiometry, order, and strain. If the A15 phase is stoichiometric and well ordered, a high T/sub c/ (and high H/sub C2/) is expected, regardless of the volume fraction of superconductor. On the other hand, if sigma phase is present with the A15, the resultant composition gradient across the sigma-A15 interface(s) requires that some of the A15 be off-stoichiometric, and therefore that the T/sub c/ (and H/sub C2/) be low. Thus the extent of the A15 (Nb3Al) reaction and the quality of the A15 formed are interdependent. This work focuses on the factors that control the extent of Nb3Al formation in Nb/Al powder wires. The morphology and content of the reacted and unreacted wires are studied in optical, SEM, and TEM micrographs. Critical current density data and its dependence on processing are explained in terms of the unreacted microstructure and its effect on the extent of Nb3Al formation. As a method of improving the critical current density, a new variation of the conventional powder process for wire manufacturing is developed and tested

  16. Creep strength of centrifugally cast Al-rich TiAl alloys

    High-temperature creep of a binary Al60Ti40 (at.%) alloy in the as-cast state and after annealing at 1223 K for 200 h which produced nearly lamellar γ-TiAl + r-Al2Ti microstructure was studied utilizing creep compression tests in a temperature range between 1173 and 1323 K in air. The material was manufactured by centrifugal casting. Microstructural characterization was carried out employing light-optical scanning (SEM) and transmission electron microscopy (TEM) as well as X-ray diffraction (XRD) analyses. It is shown that the alloy exhibits reasonable creep resistance at 1173 K, especially in relation to its low density of around 3.8 g/cm3. Stress exponents calculated as n = Δlog (strain rate)/Δlog (stress) = 4 were found to be relatively constant for the temperature and stress regime investigated. This indicates that dislocation climb may be the rate controlling creep mechanism. The assessment of creep tests conducted at identical stress levels and varying temperatures yielded activation energies for creep of around Q = 457 kJ/mol in the as-cast condition. This value is significantly higher than those found in literature for interdiffusion of Al or Ti in γ-TiAl. It is concluded that the difference is a due to the instability of the microstructure of the as-cast multi-phase alloy.

  17. Transformation to Ni5Al3 in a 63.0 at. pct Ni-Al alloy

    Khadkikar, P. S.; Locci, I. E.; Vedula, K.; Michal, G. M.

    1993-01-01

    Microstructures of 63 at. pct P/M Ni-Al alloys with a composition close to the stoichiometry of the Ni5Al3 phase were investigated using homogenized and quenched specimens aged at low temperatures for various times. Results of analyses of XRD data and electron microscopy observations were used for quantitative phase analysis, performed to calculate the (NiAl + Ni5Al3)/Ni5Al3 phase boundary locations. The measured lattice parameters of Ni5Al3 phase formed at 823, 873, and 923 K indicated an increase in tetragonality of the phase with increasing nickel content.

  18. Corrosion and environment-assisted cracking behavior of friction stir welded Al 2195 and Al 2219 alloys

    Hu Wusheng; Meletis, E.I. [Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Mechanical Engineering

    2000-07-01

    The friction stir welding (FSW) process has been evaluated for application on the Al 2195 cryogenic tank of the space transportation system. In the present study, the general corrosion, pitting and stress corrosion cracking (SCC) resistance of 2195 plates joined by FSW was investigated. Plates of Al 2219 joined by FSW were also tested for comparison purposes along with Al 2195 and Al 2219 plates joined by the variable polarity plasma arc welding method. The general corrosion, SCC and pitting behavior of FSW Al 2195 and Al 2219 is presented and discussed. (orig.)

  19. Study on production of AlON nanowire%AlON纳米线制备研究

    刘英; 郭恩作; 郭刚; 于宗淇; 赵蹇; 李志杰

    2003-01-01

    采用直流电弧等离子体法成功制取了AlON纳米线,其主要成分为Al3O3N(AlN∶Al2O3=1∶1).在AlON纳米线中,最长的达到5.5?μm,直径最小的达到25?nm,长径比为150.实验表明,AlON纳米线是尖晶石结构.

  20. Penafsiran Sufistik Surat Al-Fatihah dalam Tafsir Tāj Al-Muslimîn dan Tafsir Al-Iklîl Karya KH Misbah Musthofa

    Iskandar Iskandar

    2015-12-01

    Full Text Available The article explains the sufism tafsir of Surah Al-Fatihah in the tafsir of Tâj Al- Muslimîn and al-Iklîl written by KH. Misbah Musthofa by using tahlili method. The findings shows that 7 verses of Al-fâtihah have Sufism nuances, especially in verse 5, dealing with worship to Allah which consists of 3 levels; low, middle, and high worship. The tafsir of Tâj Al- Muslimîn and al-Iklîl, written by KH. Misbah Musthofa, have some strengths and flaws. The tafsir of Surah Al-Fatihah in Tâj Al- Muslimîn and al-Iklîl are still relevant in this modern era. It is proven by the explanation of the importance model of multi-dimension and multi-function of the human services. Still, from the aspect of the language, it needs some adjustment and modification. So that, to understand Al-Qur’an, as proposed by Muhammed Arkoun by using mystical analysis, such as: reading “ar-rahman ar-rahim”, we do not say or do the action, but we also create the action; hope, forgiveness, confession, or request.