WorldWideScience

Sample records for aportaciones al conociiento

  1. El culto al árbol y otras aportaciones hispanas pioneras de Alberto Nin

    OpenAIRE

    García Pérez, Guillermo

    2012-01-01

    Aportaciones pioneras del ensayista hispano Alberto Nin Frías (1878-1937)en relación con la protección del medio ambiente, la importancia de los árboles, la psicología diferencial humana y la consideración pública de las distintas formas y niveles de homosexualidad.

  2. El enfoque positivo de la educación: aportaciones al desarrollo humano

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    Clara ROMERO PÉREZ

    2012-02-01

    Full Text Available Este artículo analiza las perspectivas teóricas actuales que fundamentan las propuestas educativas orientadas a promover el desarrollo positivo de las personas. Se exponen, en primer lugar, las características más relevantes del enfoque positivo. A continuación, nos detenemos en el concepto de yo positivo y su relación con la eudaimonia, el autocuidado y el autogobierno emocional. En tercer lugar, tomando como referencia las aportaciones de la Psicología Positiva y la Ciencia de la Prevención se analizan las dos orientaciones generales –hedónica y eudemónica– desde las que se fundamentan diferentes propuestas pedagógicas dirigidas a la educación para el bienestar, el desarrollo socioemocional y la educación del carácter. Concluimos que, a pesar de carecer de un saber práctico cerrado sobre la felicidad y el arte de vivir, una educación positiva orientada a los procesos de construcción humana debe promover tanto las competencias emocionales y sociales como los sentimientos y competencias morales para el desarrollo óptimo del ser humano.

  3. Aportaciones de la investigación respecto al tratamiento psicosocial y familiar de pacientes con esquizofrenia

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    Marcelo Valencia C.

    2003-01-01

    Full Text Available Este trabajo tiene como objetivo presentar las principales aportaciones terapéuticas y de investigación realizadas desde 1979 al 2003, en el Instituto Nacional de Psiquiatría Ramón de la Fuente, antes Instituto Mexicano de Psiquiatría, en donde se aplicaron diversas formas de tratamiento psicosocial a pacientes con esquizofrenia, así como el tratamiento familiar correspondiente, dirigido a las familias de estos pacientes La esquizofrenia es una enfermedad que se caracteriza por la presencia de sintomatología psicótica, y también porque incapacita al paciente de manera considerable, alterando su funcionamiento psicosocial y familiar. Se ha considerado que el tratamiento integral actual de la esquizofrenia, debe considerar por lo menos cuatro aspectos fundamentales: 1.- el tratamiento farmacológico, 2.- el tratamiento psicosocial, 3.- la terapia familiar, y 4.- el manejo del paciente en la comunidad. Respecto al componente psicosocial, se han identificado áreas específicas en las cuales los pacientes tienen dificultades para tener un desempeño de roles efectivo y satisfactorio en cuanto a su funcionamiento psicosocial. Estas áreas incapacitan a los pacientes a desarrollar actividades que tienen que ver con aspectos ocupacionales, manejo de dinero, relaciones sociales, vínculos de pareja y relaciones familiares. Los tratamientos psicosociales desarrollados a nivel internacional han demostrado su efectividad terapéutica ya que mejoran el funcionamiento psicosocial, ayudan a reducir las recaídas y rehospitalizaciones y a tener un funcionamiento comunitario más satisfactorio para el paciente.

  4. Aportaciones de la educación física al desarrollo de la competencia básica: autonomía e iniciativa personal

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    Cañabate Ortiz, Dolors; Zagalaz Sánchez, Ma Luisa

    2011-01-01

    El objetivo de este artículo es enfrentarse al reto de responder a la necesidad de concretar aprendizajes de acuerdo con el nuevo currículo basado en competencias en el área de educación física (EF). Partiendo de este compromiso, presentamos una propuesta respecto a las aportaciones que la EF puede y debe aportar al desarrollo de la competencia de autonomía e iniciativa personal. Para ello, en la primera parte se indican las capacidades relacionadas con la competencia que se pretende desarrol...

  5. Aportaciones sociológicas al estudio de la salud mental de las mujeres

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    Teresa Ordorika Sacristán

    2009-01-01

    El presente artículo analiza las contribuciones de la teoría feminista al problema de la salud mental de las mujeres. Con base en las perspectivas sociológicas de la producción, la construcción social y el estudio de las experiencias subjetivas del padecimiento se esbozan cuatro líneas de investigación sociológica, con enfoque de género, para abordar el estudio de los problemas mentales femeninos. Según datos de la Organización Mundial de la Salud (OMS), aproximadamente 450 millones de person...

  6. Pedagogía Montessori: Postulados generales y aportaciones al sistema educativo.

    OpenAIRE

    Rodríguez-Blanque, Elena

    2013-01-01

    Se presenta un estudio exploratorio sobre la pedagogía Montessori, con el objetivo de conocer las características de esta pedagogía y qué aporta al medio educativo. Para ello, se ha hecho una revisión de los planteamientos teóricos propuestos por María Montessori, como creadora de dicho método y de otros autores que también han investigado sobre esta área. Para completar esta investigación, además de la revisión teórica, se ha explorado también la pedagogía Montessori en base a observacion...

  7. Noves aportacions al desenvolupament de motors elèctrics sense coixinets.

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    Prat Ayats, Josep

    1997-01-01

    Ens proposem fer girar tubs de material conductor (coure o alumini) de diferents llargades i diàmetres. Aquest tub que hom vol fer girar és el secundari d'una màquina elèctrica d'inducció, i actua de rotor o part mòbil. L'inductor de la màquina, que actua d'estàtor o part fixa, està alimentat per mitjà d'una font de corrent ideal. Ens trobem, per tant, en un sistema elèctric alimentat per font de corrent, en contraposició al sistema elèctric usual que s'alimenta per font de tensió. En el sist...

  8. Paleoclimatological revision of climate evolution in Spain since the middle pleistocene from travertine and speleothems studies; Aportaciones al conociiento de la evolucion paleoclimatica y paleoambiental en la pensinsula iberica durante los dos ultimos millones de anos a partir del estudio de travertinos y espeleotemas

    Energy Technology Data Exchange (ETDEWEB)

    Torres, T.; Barettino, D.; Canoira, L.; Cobo, R.; Garcia-Cortes, A.; Grun, R.; Hoyos, M.; Julia, R.; Llamas, R.

    1996-10-01

    This paper deals on the main results of the Project: ``Paleoclimatological revision since the Middle Pleistocene from geochronological and isotope analysis of spanish travertine`` (CEC-F12W-CT91-0075 ``Paleoclimatological revision of climate evolution in the Western Mediterranean Region, evaluation of altered scenarios). Four travertine deposition areas and a karstic zone were selected according to their geographical signification. Travertine deposits areas were: Priego and Rio Blanco: fluvial travertine; Banyoles and Rio Blanco: lacustrine deposits; Tolox: Alluvial fan deposits. The Cueva del Reguerillo was the karstic area selected. In spite of travertine and speleothems are warm climate indicators, important paleoenvironmental and palaeoclimatological data were obtained, which are in short: Through geomorphology and dating (palaeomagnetism, U/Th, Electro spin resonance and amino acid racemization analysis) the fluvial history of Priego, Rio Blanco and el Reguerillo cave, where a neotectonic and palaeosismicity phenomena were also dated. The oldest ESR dating method age obtained was of 950ka; and the oldest Priego deposits AARD dated were 750 ka old. Through dating, sedimentology, stable isotope analysis and palinology some aspects of climatic evolution of the Iberian Peninsula were determined. A net correlation found between palinology and stable isotope ratios in the Banyoles lake drill hole, allowed to validate the results. Some cualitative data on fluvial and karstic systems water input were determined also.

  9. Integración de la información espacio temporal para la restitución de las series de aportaciones al régimen natural utilizando sistemas de información geográfica

    OpenAIRE

    Marizza, Marta Susana

    2003-01-01

    Se ha creado una herramienta en el medioambiente de un Sistema de Información Geográfica con la finalidad de estimar la restitución de las series de aportaciones de una cuenca hidrográfica al régimen natural, integrando la información espaciotemporal Se trata de una extensión de Arc View (SIG), denominada “Restitución”, que posee tres menús elaborados en lenguaje Avenue. Las rutinas asociadas a las distintas opciones de los menús permiten ir paso a paso estimando la restitución de las apor...

  10. Nuevas aportaciones al catálogo aeropalinológico de Córdoba: plantas exóticas

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    Gálvez, C; Ubera Jiménez, José Luis

    1985-01-01

    Se ha estudiado el pol en de 22 taxones de la flora exótica de la ciudad de Córdoba , posiblemente anemófilos. La presencia de estos taxones es importante en unos casos por su caracter al ergógeno ( Schinus, Ricinus, Aesculus, Elaeagnus y Acacia ); en otros por ser ti picamente en tornó filas (Tipuana, Sophora, Impatiens, Callistemon y Feijoa) y en otros casos por su problemática de recolección o determinación en los mues t reos ( Melia , Libocedrus, Taxodium, Carex, Cyperus...

  11. Aportaciones al diseño de micromáquinas de inducción electrostáticas

    OpenAIRE

    Santana Martín, Francisco Jorge

    2012-01-01

    [ES] La tendencia teconológica en el ámbito de la microelectrónica está dirigida al desarrollo de dispositivos, circuitos y sistemas de muy bajo consumo. En las tecnologías MEMS se hacen esfuerzos en el escalado de dispositivos ya conocidos en la macroescala. Para su fabricación de utilizan las técnicas de fabricación de circuitos integrados, esto hace posible obtener una producción maisva y de bajo coste. Este campo es deficitario en herramientas de desarrollo, diseño, simulación test y opti...

  12. Aportaciones al conocimiento de las técnicas constructivas altomedievales en Álava, Gupúzcoa y Vizcaya

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    Azkarate Garai-Olaun, A.

    2005-12-01

    Full Text Available Up to a few years ago, the study of High-Medieval building techniques had not been an overly popular subject for research in the Basque Country, partly because of the relative lack of development of both theoretical and methodological tools. The tide is now turning in part due to a series of investigations that, with backing in the development of Building Architecture, are unearthing a relevant number of evidences, as well as new theoretical approaches to interpret them. The following paper intends to identify those buildings that can be chronologically placed within the High Middle Ages as well as establish its features, in order to provide a preliminary sketch of the evolution of building techniques from the VIIIth to the XIth centuries. Our intent is to make visible the people responsible for their execution, whether the users of the buildings themselves or group of specialized builders.El estudio de las técnicas constructivas altomedievales en el País Vasco no ha sido un tema de investigación muy difundido hasta hace pocos años, en parte debido a que las herramientas teóricas y metodológicas no estaban suficientemente desarrolladas. Esta situación está empezando a ser solventada gracias a una serie de investigaciones que, apoyándose en el desarrollo de la Arqueología de la Arquitectura, están sacando a la luz un número relevante de evidencias así como nuevas líneas teóricas para interpretarlas. En el presente trabajo se pretende, en primer lugar, identificar aquellas construcciones que puedan ubicarse cronológicamente en la Alta Edad Media. Una vez establecidas sus características se busca delinear, a modo de boceto inicial, la evolución de las técnicas edificatorias durante los siglos VIII al XI. Con ello esperamos llegar a hacer visibles a los responsables de su ejecución, sean los propios usuarios de los edificios o grupos de constructores especializados.

  13. Nuevas aportaciones al conocimiento acerca de la utilización clínica de la densitometría ósea

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    Roig Vilaseca, Daniel

    2006-01-01

    [spa] Revisión de los factores que intervienen en la interpretación de la densitometría ósea (aparato, regiones de interés, información aportada por la técnica, curvas de referencia de normalidad poblacional) y su indicación (criterios de indicación de densitometría de diferentes organismos). Se relacionan 5 estudios con las aportaciones en relación a la interpretación de la densitometría y su indicación. En el primer estudio se evalúa la importancia de la curva de normalidad de referencia pa...

  14. De la convexidad de la función de utilidad. Aportaciones de von Neumann y Morgenstern al concepto de utilidad en economía.

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    López Zafra, Juan Manuel

    2003-01-01

    Full Text Available Durante las últimas jornadas de Asepuma celebradas en la sede de la Universidad San Pablo-CEU, el autor mantuvo una enriquecedora discusión con uno de los participantes en la sesión en la que defendía la presentación del trabajo “Matemáticas y teoría de la utilidad”, del que no era autor. Básicamente, lo que el participante defendía era la inexistencia de toda función de utilidad que no se sometiese a los principios derivados de la economía clásica, esto es, la imposibilidad de una función de utilidad convexa. Durante las próximas líneas efectuaremos un breve repaso por la evolución del concepto de utilidad en economía, desde la aportaciones originales de Bernouilli hasta las quizá revolucionarias de John von Neumann y Oskar Morgenstern, quienes en 1944 plantearon por vez primera una concepción axiomática de la utilidad que permite, tal y como veremos, la convexidad de la función de utilidad.

  15. Aportaciones desde la psicología cognitiva y la inteligencia artificial al diagnóstico de la enfermedad de Alzheimer

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    Guerrero Triviño, José María

    2013-01-01

    Esta tesis doctoral tiene por objeto colaborar al diagnóstico de la EA en fase leve y moderada desde el campo de la Psicología Cognitiva y la IA. Para ello, se ha elaborado un método de diagnóstico que pretende ser complementario a las técnicas habituales, que permite identificar el deterioro cognitivo, de la memoria semántica declarativa, compatible con el estado más o menos leve de la EA. Es decir, estas alteraciones cognitivas se manifiestan de manera muy sutil en las primeras fases de la ...

  16. Aportaciones a la transición del hiero I al hierro II en el centro de la cuenca del udero

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    Manuel GARCÍA ALONSO

    2009-10-01

    Full Text Available En la diversidad de publicaciones que se ponen al alcance del investigador, y que son referidas a la Edad del Hierro, entendida de una manera amplia, se viene observando, en el manejo terminológico más bien, una serie de cuestiones que quedan latentes entre las diferentes tomas de postura; pero que, salvo excepciones, no dan pie a una discusión o puesta en común de las mismas, y que entendemos son de capital importancia para la zona objeto de la presente comunicación.

  17. Compartir la custodia o compartir los cuidados : aportaciones al debate desde la perspectiva de género y los estudios de masculinidad.

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    Blanco López, Juan

    2013-01-01

    Este artículo pretende un análisis crítico de la demanda de custodia compartida, por parte de algunos grupos de hombres, con la que pretenden acceder de forma igualitaria al cuidado de sus hijos e hijas. Algo que en principio debería ser reivindicado desde la perspectiva de género ya que pone en cuestión los presupuestos tradicionales que separan, en función del sexo, la funciones de provisión y protección de las de cuidado y reproducción. Sin embargo, la mayoría de sus defe...

  18. Aportaciones al desarrollo ecoturístico sostenible, a partir de las relaciones intersectoriales en áreas protegidas: Experiencia Parque Nacional Viñales, Cuba

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    Pérez Hernández, Iverilys; Ramírez Pérez, Jorge Freddy

    2013-01-01

    En el campo de la ciencia se ha venido gestando una revolución con relación al desarrollo local sostenible; es evidente que la actividad turística brinda hoy la posibilidad de poner en práctica esta experiencia. El desarrollo local sostenible con eje en el turismo, es una vía de progreso y de autogestión para las localidades, sin descartar la necesidad de la integración de los demás sectores presentes en la localidad. La gestión en las localidades pretende lograr una vinculación armónica entr...

  19. Teoría de juegos: Aportaciones al proceso de investigación y consultoría de empresas agropecuarias

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    Gerardo Gómez González; José Luis Ruiz Guzmán

    2004-01-01

    La actual crisis del sistema productivo alimentario en México, provoca en nuestras instancias universitarias, el interés de aportar nuevos instrumentos al proceso de consultoría e investigación, que facilite la eficiencia del diagnóstico y solución de problemas en el área de productividad y competitividad del sector agropecuario. Se emplea el método analítico-sintético para generar la guía denominada Estrategias de Formulación de la Investigación en Ciencias Agropecuarias (Efi-ciencia Agropec...

  20. Aportaciones sociológicas al estudio de la salud mental de las mujeres Sociological Contributions to the Study of Women's Mental Health

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    Teresa Ordorika Sacristán

    2009-01-01

    El presente artículo analiza las contribuciones de la teoría feminista al problema de la salud mental de las mujeres. Con base en las perspectivas sociológicas de la producción, la construcción social y el estudio de las experiencias subjetivas del padecimiento se esbozan cuatro líneas de investigación sociológica, con enfoque de género, para abordar el estudio de los problemas mentales femeninos. Según datos de la Organización Mundial de la Salud (OMS), aproximadamente 450 millones de person...

  1. Aportaciones al diseño de ADCs en tecnologías nanométricas y para entornos de alta radiación

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    Márquez Lasso, Fernando J.

    2015-01-01

    El trabajo presentado a lo largo de esta Tesis Doctoral está intrínsecamente relacionado con la evolución del diseño de circuitos integrados analógicos y de señal mixta empleando tecnologías nanométricas. En los últimos años, el desarrollo de dichas tecnologías ha posibilitado un avance gigantesco en cuanto a funcionalidad y velocidad de los sistemas de comunicaciones, provocando un gran auge en los sistemas de comunicaciones, con especial relevancia de los estándares inalámbricos. No obstant...

  2. Romeu y la Guerra del Francés: Aportaciones del drama valenciano al desarrollo de la competencia sociolingüística

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    Mª Begoña Gómez Devís

    2015-06-01

    Full Text Available El trabajo que presentamos abarca un amplio objetivo: dotar a los aprendices de recursos y estrategias de expresión y comprensión, así como de conocimientos para reflexionar sobre los usos lingüísticos y no lingüísticos disponibles en situaciones y contextos variados. El diseño de nuestra propuesta se articula en torno a tres ejes: el histórico, visión de los acontecimientos de la guerra de la Independencia a través de la figura del guerrillero saguntino José Romeu Parras; el literario, acercamiento al hecho teatral (autor y drama valencianos de finales del siglo XIX; y el análisis de las relaciones entre lengua y sociedad, centrándonos en las condiciones sociales y culturales de uso de las lenguas catalana y española.

  3. Aportaciones al conocimiento de los mosquitos (Diptera, Culicidae de alta montaña presentes en la Península Ibérica

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    Jiménez Peydró, R.

    2009-12-01

    Full Text Available Several larval samplings of mosquitoes (Diptera, Culicidae in different mountainous regions of the peninsular Spain were carried out. A total of 2796 specimens belonging to 18 species were collected, nevertheless the 72.5 % of these finds includes only three of them (Cx. hortensis hortensis, Cx. pipiens and Cs. longiareolata. The adaptation capacity to a varied typology of water bodies together with the marked multivoltinism that characterizes their biotic cycles are postulated as two of the principal reasons that explain their abundances. The altitudinal distribution as well as some information about the bioecology of all the species captured are also exposed.Se realizaron diversos muestreos larvarios de mosquitos (Diptera, Culicidae en varias regiones montañosas de la España peninsular. Pese a que se recolectaron un total de 2796 ejemplares pertenecientes a 18 especies, el 72.5 % de estos hallazgos engloba únicamente a tres de ellas (Cx. hortensis hortensis, Cx. pipiens y Cs. longiareolata. La capacidad de adaptación a un variado elenco de cuerpos de agua de diferente tipología, unida al marcado multivoltinismo que caracteriza sus ciclos bióticos, se postulan como dos de las principales razones que explican sus abundancias. La distribución altitudinal así como diversa información acerca de la bioecología de todas las especies capturadas también se exponen en el presente trabajo.

  4. Aportaciones sociológicas al estudio de la salud mental de las mujeres Sociological Contributions to the Study of Women's Mental Health

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    Teresa Ordorika Sacristán

    2009-12-01

    Full Text Available El presente artículo analiza las contribuciones de la teoría feminista al problema de la salud mental de las mujeres. Con base en las perspectivas sociológicas de la producción, la construcción social y el estudio de las experiencias subjetivas del padecimiento se esbozan cuatro líneas de investigación sociológica, con enfoque de género, para abordar el estudio de los problemas mentales femeninos. Según datos de la Organización Mundial de la Salud (OMS, aproximadamente 450 millones de personas en todo el mundo sufren padecimientos mentales. Éstos constituyen un problema social de primer orden cuya solución no puede prescindir de los aportes de las ciencias sociales.This article analyzes the contributions of feminist theory to the problem of women's mental health. On the basis of the sociological perspectives of production and social construction, and the study of the subjective experiences of suffering, the author provides a brief description of four lines of sociological research with a gender approach for dealing with the study of female mental problems. According to data from the World Health Organization (WHO, approximately 450 million persons all over the world suffer from mental disorders. These constitute a social problem of the first order, requiring attention from the social sciences.

  5. Aportaciones al análisis constructivo de fábricas antiguas: La capilla de La Antigua de San Miguel en Morón (1538

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    Pinto, F.

    2013-06-01

    Full Text Available Carrying out restoration works at old constructions offers a valuable opportunity for learning more about the building legacy they conceal, especially when they are the result of historical remodellings and extensions. A knowledge of the solutions that the builders adopted for stone walls, arches and vaults, of the construction logics followed and of the techniques applied provides vital clues for understanding their structural behaviour and the reasons for the discernible lesions, and for evaluating their condition correctly. During our restoration of the chapel of La Antigua adjoining the church of San Miguel in Morón, we were able to observe this legacy and confirm the importance of compiling knowledge obtained from various sources such as the graphic survey of the construction, the building sequence, geotechnical and documentary studies, and the analysis of the formal graphic control systems used to draw the plans, known as architecture treatises and manuscripts.Las obras de restauración sobre construcciones antiguas es un momento indispensable para el conocimiento del legado constructivo que permanece oculto en ellas, sobre todo cuando son resultado de reformas y ampliaciones históricas. El conocimiento de las soluciones en muros, arcos y bóvedas de piedra adoptadas por los constructores, la lógica constructiva seguida y las técnicas aplicadas, es indispensable para comprender su comportamiento estructural, las causas de las lesiones perceptibles, y proceder a su correcta evaluación. Durante la restauración de la capilla de La Antigua, adosada al templo de San Miguel en Morón, hemos podido observar este legado y confirmar hasta que punto era necesario su conocimiento interrelacionando diversas fuentes como la información obtenida mediante su levantamiento gráfico, la lectura de la secuencia constructiva, los estudios geotécnicos y documentales, así como el análisis de los sistemas gráficos de control formal que permitieron su

  6. Las nuevas aportaciones del neuromarketing y el inconsciente cognitivo a la publicidad del siglo XXI.

    OpenAIRE

    González Zarzuelo, Marta del Pilar

    2014-01-01

    Partiendo del análisis del desarrollo publicitario en el último siglo, este trabajo indaga las aportaciones del inconsciente cognitivo y el neuromarketing al actual desarrollo de la publicidad como herramienta del marketing. Recientemente el marketing se ha unido con la neurociencia para desarrollar el neuromarketing. Esta nueva disciplina se basa principalmente en la aplicación de las técnicas de la neurociencia a las técnicas tradicionales del marketing. Técnicas que hasta el día de hoy no ...

  7. La incorporació de les aportacions de les científiques en els materials didàctics

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    Solsona Pairó, Núria

    2006-01-01

    Diferents materials didàctics d’ESO recullen les aportacions d’algunes científiques al llarg de la història. La utilització didàctica de les receptes de Marie Meurdrac, del segle XVII serveix de referència perquè l’alumnat escrigui les seves receptes en treballar la introduc-ció a la química.

  8. Aportaciones al conocimiento de la dinámica de la materia orgánica edáfica en suelos calizos del páramo Castellano-Leonés

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    Llorente Sánchez, Mireia

    2012-01-01

    Ante la problemática del Cambio Climático, acucia la necesidad de profundizar en el conocimiento del comportamiento de los ecosistemas como fuentes-sumideros de C. La materia orgánica del suelo (MOS) representa, dentro de los ecosistemas terrestres, el reservorio con mayor importancia en la regulación del C atmosférico y los flujos de ésta en el ecosistema están fuertemente ligados al uso del suelo. Los usos del suelo de los páramos calizos estudiados en esta tesis han sufrido una serie de...

  9. Economía social y Soberanía Alimentaria. Aportaciones de las cooperativas y asociaciones agroecológicas de producción y consumo al bienestar de los territorios

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    Cabanes Morote, Mar; Gómez López, José Daniel

    2014-01-01

    El actual contexto de crisis global, que afecta de forma integral al bienestar de las personas y los territorios, nos plantea la necesidad de buscar alternativas y nuevos modelos de desarrollo económico, social, cultural y político que sean sostenibles en el tiempo y sustentables desde el punto de vista ecológico. El presente artículo aborda los fundamentos de la Soberanía Alimentaria como derecho de los pueblos en la construcción de sus propios sistemas agroalimentarios y como principio fund...

  10. Aportaciones de la Toxicología Clínica al conjunto de la investigación toxicológica en España durante 15 años (1991-2005

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    S Nogué

    2009-01-01

    Full Text Available Cada vez resulta más importante medir de forma objetiva la producción científica individual, de los grupos de investigación o de un área científica, para lo que se utilizan parámetros bibliométricos. En el presente estudio se analiza la actividad investigadora llevada a cabo por los toxicólogos españoles durante 15 años, se compara con la de otras áreas científicas y con la de los toxicólogos de otros países y, finalmente, se investiga la aportación de la toxicología clínica al conjunto de la investigación toxicológica española. Se empleó como herramienta de búsqueda bibliométrica de documentos científicos publicados por toxicólogos españoles el programa Web of Knowledge del Institute for Science Information (ISI y como base de datos el Science Citation Index (SCI. El periodo de tiempo analizado fue de 1991 a 2005. Los datos tabulados fueron: año de publicación, nombre de la revista y su factor de impacto, país del editor de la revista, tipo e idioma del documento, centro, provincia y comunidad del primer toxicólogo firmante, colaboración con otros servicios de toxicología y número de citas que recibió el artículo. Para el análisis estadístico, los datos se introdujeron en el programa informático SPSS versión 12.0. Durante los 15 años estudiados se han identificado 1904 documentos firmados por toxicólogos españoles y publicados en 523 revistas diferentes. Durante este periodo de tiempo, se ha observado un incremento progresivo y significativo del número de documentos firmados por toxicólogos, así como de los documentos encuadrados en el área de toxicología. Sin embargo, como la producción científica global en España ha mostrado un marcado aumento, el porcentaje que supone la toxicología respecto a la producción total española, ha experimentado un significativo descenso. En un 16% de los trabajos se estableció una colaboración internacional. Se identificaron 79 centros toxicológicos espa

  11. Aportacion al catalogo micologico de Cataluña. I.

    OpenAIRE

    Llistosella, Jaume; Gràcia, Enric; Aguasca Solé, Montserrat

    1982-01-01

    Presentamos en esta primera nota un análisis de la especie Hygrocybe conicoides (Orton) Orton y Watling, primera cita para el catalogo micológico de Cataluña. Se tratan los aspectos macroscópicos y microscópicos, así como los caracteres diferenciales de la especie y su identidad taxonómica. Hygrocybe conicoides aparece como un hongo psamófilo, posiblemente citado en otras ocasiones como forma arenícola de H. nigrescens e H. cónica (LOSA QUINTANA, 1968; HEIM, 1934).

  12. Aportaciones de la sociología al estudio de la nutrición humana: una perspectiva científica emergente en España Sociological contributions to the study of human nutrition: a developing scientific: perspective in Spain

    Directory of Open Access Journals (Sweden)

    J. Sanz Porras

    2008-12-01

    Full Text Available El acto de comer deviene uno de los nodos más evidentes de interconexión entre procesos biológicos, sociales, psicológicos y culturales. Sin embargo, cada disciplina ha tendido a construir sus propios y específicos campos científicos sobre la nutrición, de un modo que implica el manejo de sus propios corpus teóricos así como sus propias hipótesis sustantivas. Frente a esta realidad, este artículo pretende dar a conocer de forma sucinta las aportaciones de la sociología de la alimentación para los profesionales de la nutrición humana. Se presentaran sus objetivos y aportaciones, sus ámbitos de estudio y, finalmente, los rasgos actuales de la alimentación en la sociedad moderna.Human eating becomes one of the clearest intersections among biological, social, psychological and cultural processes nowadays. However, each scientific discipline has developed its own hypothesis and corpus of knowledge about human nutrition. Against this, it is the contention of this article to offer to nutritional professionals the efforts of sociology on this topic. It will be developed its purposes and contributions, its fields of research and, finally, a description of the social features of nourishment in modern societies.

  13. Las aportaciones de 'Psychology and athletics' (1928) de C.R. Griffith a la psicología del deporte.

    OpenAIRE

    Cruz Feliu, Jaume; Capdevila Ortís, Lluís

    1998-01-01

    En este trabajo se enfatiza la validez de algunas ideas expuestas por Coleman R. Griffith -el padre de la psicología del deporte en Estados Unidos- en su libro Psychology and athletics (1928), al cumplirse setenta años de su publicación. La comunicación se estructura en cuatro partes: 1)las aportaciones de Griffith a la psicología del deporte en el período 1920-1939; 2)la ubicación del libro 'Psychology and athletics' (1928) dentro de la obra de Griffith; 3)el análisis de algunos procesos psi...

  14. Los efectos del Fondo de Aportaciones para la Infraestructura Social sobre la pobreza en México

    OpenAIRE

    Fernando Ramones; Daniel Prudencio

    2014-01-01

    En el presente estudio se examinan los efectos en el ámbito estatal del Fondo de Aportaciones para la Infraes - tructura Social sobre la pobreza y rezago en México, del año 2000 al 2010. Con el uso de modelos de mínimos cuadrados ordinarios y de mínimos cuadrados de dos eta - pas, con variables instrumentales para corregir por endo - geneidad, se encontró una relación nula o muy débil del monto asignado de dicho fondo con las diferentes medidas de pobreza. Estos resultados sugieren la posible...

  15. Aportaciones de la psicología conductual a la educación

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    ADRIANA GONZÁLEZ ZEPEDA

    2004-01-01

    Full Text Available Una de las peculiaridades de la psicología conductual es su incuestionable tradición experimental evidenciada en un inconmensurable bagaje de estudios de investigación aplicada, relacionados con los hallazgos previos obtenidos en la investigación básica encaminada a esclarecer las condiciones en las cuales ocurre o no la adquisición, el mantenimiento y la generalización de conductas. Este hecho ha propiciado la generación de valiosos conocimientos sobre dos temas de valor fundamental para la educación: el aprendizaje y el desarrollo. De aquí que resulte ineludible que desde esta perspectiva teórica, la psicología aún continúe brindando valiosas aportaciones a la educación. Desde la perspectiva conductual la situación de enseñanza es concebida como algo estructurado susceptible de ser guiado por los principios del condicionamiento operante,1 dado que es un contexto en el que se busca que el individuo adquiera un amplio repertorio conductual que se traduzca en una ventaja para él, para su futura adaptación a las diversas exigencias sociales. Conforme este supuesto básico surgió lo que se ha denominado enseñanza programada, una de las principales contribuciones del conductismo al ámbito educativo, principalmente en los niveles primario y secundario. Otras contribuciones de esta perspectiva teórica al terreno educacional pueden vislumbrarse en dos áreas específicas: en la educación especial y la educación superior. En el presente trabajo se describirán brevemente las peculiaridades de la enseñanza programada y se mencionarán algunas de las principales aportaciones de la perspectiva conductual en las dos áreas antes señaladas. Complementariamente se señalan algunos límites y alcances de esta perspectiva teórica.

  16. Aportaciones de la pedagogía Freinet a la educación en España

    OpenAIRE

    Gertrúdix Romero de Ávila, Sebastián

    2016-01-01

    La pedagogía Freinet arraigó muy pronto en nuestro país, debido al carácter marcadamente social de la misma. La Guerra Civil y el triunfo del Franquismo acabaron con su avance y hubo que esperar a finales de los años sesenta del siglo pasado para que se empezase a hablar de nuevo de Freinet. Para comprender las aportaciones que esta pedagogía ha hecho a la educación en España, es necesario conocer los principios que la inspiran y las técnicas que creó el pedagogo francés, las cuales supone...

  17. Un estudio del dolor en el marco de la conducta verbal: de las aportaciones de W. E. Fordyce a la Teoría del Marco Relacional (RFT)

    OpenAIRE

    Olga Gutiérrez Martínez; Carmen Luciano Soriano

    2006-01-01

    En este estudio teórico se presenta una aproximación al análisis de los eventos privados en general y del dolor en particular desde una perspectiva funcionalcontextual bajo las aportaciones recientes de la conducta verbal, las relaciones arbitrarias entre eventos y la derivación de funciones psicológicas. Se hace una revisión de cómo los analistas de conducta han abordado el estudio del dolor como factor de control de otros comportamientos y, partiendo de la integración de esta...

  18. Por un “derecho al olvido” para los europeos: aportaciones jurisprudenciales de la sentencia del Tribunal de Justicia Europeo del caso Google Spain y su recepción por la sentencia de la Audiencia Nacional Española de 29 de diciembre de 2014

    OpenAIRE

    Azurmendi, Ana

    2015-01-01

    La Sentencia del Tribunal de Justicia Europeo de 13 de mayo de 2014 (Caso C-131/12) Google Spain, S. L., Google, Inc./Agencia Española de Protección de Datos (AEPD), Mario Costeja González ha significado el respaldo definitivo de la Unión Europea al derecho al olvido. En medio de la reforma de la actual Directiva 95/46 de Protección de Datos Personales, y en el contexto de una crisis diplomática entre Estados Unidos y Europa por las revelaciones sobre espionaje masivo en Internet, los argumen...

  19. Nuevas aportaciones a la Conservación y Restauración decimonónica en la Catedral de Sevilla

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    Ana Galán Pérez

    2013-07-01

    Full Text Available El presente artículo ofrece nuevas aportaciones a la Conservación y Restauración decimonónica en la Catedral de Sevilla, reconociendo una diversidad en el origen del corpus normativo y legal de protección de la Catedral, identificando las metodologías en su consecución así como las prioridades en las intervenciones restauradoras, comprobando a su vez la formación de las relaciones institucionales que han generado una red en torno al cabildo, con especial relevancia a los profesionales que se dedicaron a la conservación y restauración.

  20. HACIA EL COMPORTAMIENTO HUMANO MODERNO. NUEVAS APORTACIONES AL PALEOLÍTICO MEDIO FINAL EN EL VALLE DEL RÍO ARLANZA (HORTIGÜELA, BURGOS, ESPAÑA (Understanding modern human behavior. New contributions from the later Middle Paleolithic in the Arlanza river valley

    Directory of Open Access Journals (Sweden)

    Marta Navazo

    2010-12-01

    Full Text Available En el valle medio del Arlanza (Hortigüela, Burgos se conocen dos asentamientos musterienses ya clásicos en la bibliografía: Millán y La Ermita. En este trabajo se incorporan estudios que permiten un mejor y actualizado conocimiento de los mismos en base al análisis de uno de los niveles de Millán, la caracterización geoquímica de los afloramientos de sílex de la zona, y del material arqueológico, para conocer las fuentes de aprovisionamiento; y los sistemas de explotación y configuración de ambas cavidades. El estudio derivado del valle medio del Arlanza, a partir de sus características tecnológicas y cronología (Paleolítico medio final, da pie para abordar un interesante debate abierto sobre el surgimiento del comportamiento humano moderno, reflexionando sobre si las características que han servido para definir dicha conducta son exclusivas del Homo sapiens o si, por el contrario, esos procesos de cambio ya estaban presentes al final del Paleolítico medio. ENGLISH: In the middle valley of the Arlanza river (Hortigüela, Burgos, two classic Mousterian sites, Millán and La Ermita, have been documented. This paper enhances and updates the previously known information about these sites. The study includes the analysis of one of the Millán levels, geochemical characterization of the flint outcrops in the zone and artifacts found in the archaeological record, with a view to ascertaining lithic material sources, and the exploitation systems characterizing both sites. The chronological position of these late Middle Paleolithic settlements facilitates a discussion about whether the characteristics that have served to define modern human behavior are exclusive to Homo sapiens or if, on the contrary, the markers of change were already present at the end of the Middle Paleolithic.

  1. Un estudio del dolor en el marco de la conducta verbal: de las aportaciones de W. E. Fordyce a la Teoría del Marco Relacional (RFT

    Directory of Open Access Journals (Sweden)

    Olga Gutiérrez Martínez

    2006-01-01

    Full Text Available En este estudio teórico se presenta una aproximación al análisis de los eventos privados en general y del dolor en particular desde una perspectiva funcionalcontextual bajo las aportaciones recientes de la conducta verbal, las relaciones arbitrarias entre eventos y la derivación de funciones psicológicas. Se hace una revisión de cómo los analistas de conducta han abordado el estudio del dolor como factor de control de otros comportamientos y, partiendo de la integración de estas aportaciones con los recientes avances del análisis de la conducta verbal, se propone la Teoría del Marco Relacional (RFT como formulación mejor articulada a la hora de ofrecer una explicación contextual del dolor. A raíz de la investigación en marcos relacionales y regulación verbal, se describe un novedoso planteamiento de los problemas clínicos de dolor como formas del trastorno de evitación experiencial (TEE que supone una aproximación a la psico(patología más parsimoniosa que la tradicional basada en la clasificación sindrómica. Además, son examinados los avances terapéuticos que se han derivado de esta concepción verbal-relacional de los problemas psicológicos, presentándose la terapia de aceptación y compromiso (ACT como un sistema terapéutico dirigido a alterar las clases de regulación verbal inefectivas y favorecer actuaciones ajustadas a los valores personales.

  2. Core stability. Concepto y aportaciones al entrenamiento y la prevención de lesiones

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    F.J. Vera-García

    2015-06-01

    Full Text Available En este trabajo presentamos una revisión de la literatura científica sobre la estabilidad de la zona central del cuerpo (core stability con el objeto de clarificar el significado de este concepto y su relación con el rendimiento y las lesiones deportivas. Los resultados de la revisión indican que el uso del término core stability es ambiguo, existiendo una gran confusión terminológica tanto en la literatura científica como en el ámbito profesional. Diversos estudios biomecánicos y epidemiológicos sugieren que el déficit en el control neuromuscular de la core stability está relacionado con el síndrome de dolor lumbar y lesiones de los miembros inferiores. Sin embargo, a pesar de que los ejercicios de core stability son elementos habituales dentro de los programas de entrenamiento deportivo, no existen evidencias suficientes para establecer una relación clara entre la práctica de estos ejercicios y la mejora del rendimiento en el deporte.

  3. Aportaciones al problema del sinhogarismo en Castilla y León: Modelo Housing First

    OpenAIRE

    Larsson, Martina Mercedes

    2014-01-01

    En este estudio sobre el modelo actual y el modelo Housing First como formas de abordar el problema del sinhogarismo e intervenir con personas sin hogar, se pretende ampliar el conocimiento sobre las dos perspectivas. Asimismo, se realiza una encuesta a los profesionales de las provincias de Castilla y León que trabajan con personas sin hogar, con el fin de conocer su opinión sobre la situación actual del sinhogarismo, el modelo actual de intervención con sus posibles ventajas ...

  4. Noves aportacions al coneixement de la flora vascular de les comarques meridionals de Catalunya. IV

    OpenAIRE

    Guardiola, Moisès; Molero, Julià; Sáez, Llorenç; López Alvarado, Javier; Ríos, Ana I.; Bagaria Morató, Guillem; Carreras i Raurell, Jordi

    2012-01-01

    En aquest treball aportem dades de 30 plantes vasculars trobades a les muntanyes Catalanídiques centrals i meridionals catalanes. Campanula fastigiata Duf. ex A. DC., Centunculus minimus L., Cephalaria syriaca (L.) Roem. & Schult, Orobanche clausonis Pomel i Rosa andegavensis Bastard, suposen novetats per a aquest territori. S’hi presenten també dades de plantes molt poc citades en aquest territori o a Catalunya: Athyrium filix-femina (L.) Roth, Chaenorhinum rubrifolium (DC.) Fourr. subsp. ru...

  5. Aportaciones de la neurociencia al tratamiento educativo de las dificultades de lectura

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    Carmen López Escribano

    2008-04-01

    Full Text Available This paper presents a historical view of the study of the brain and its relationship to intelligence, and human behavior, from Hipocrates and Alcmeon of Crotona to present days. This historical view briefly contemplates the thesis of Bell, Mangedie, Flourens, Galvani, and Gall. The importance of the neuron, neural networks, and environment is highlighted. These general principle of nature-nurture interactions means that the brain is both an independent (causal variable and a dependent (outcome variable. That is, brain is an organ that allows an organism to act on the environment and that can be changed in constrained ways as the organism interacts with the environment. In this way, teacher are an important influence on the nurture side of the nature-nurture interaction for learning. Finally, five functional neuroimaging studies, that have been published recently, are presented. These studies showed that neural deficitsin children with reading difficulties are ameliorated by behavioral remediations. These investigations examined whether phonologically-based interventions ameliorated the dysfunctional neural mechanisms in children with dyslexia. Probably, in the future these studies will be a useful way to early identification and treatment of reading difficulties.

  6. Nuevas aportaciones al procesado de huellas labiales. Los lisocromos en queiloscopia.

    OpenAIRE

    Negre Muñoz, María del Carmen

    2004-01-01

    RESUMEN Las huellas labiales latentes constituyen uno de los indicios que pueden encontrarse en el lugar donde se ha cometido algún hecho delictivo. Estas huellas se originan principalmente cuando los labios están cubiertos por lápices labiales permanentes o transparentes. La importancia de estos indicios en criminalística es doble: por una parte, pueden identificar per se y, por otra, pueden contener restos de material biológico a partir del cual se puede realizar una identificación genét...

  7. Aportaciones originales al conocimiento de las células intersticiales de Cajal

    OpenAIRE

    Cantarero Carmona, Irene; Junquera Escribano, María Concepción

    2012-01-01

    Las células intersticiales descritas por D. Santiago Ramón y Cajal, en relación con los plexos del Sistema Nervioso Entérico, constituyen una entidad biológica específica. En la actualidad son reconocidas internacionalmente con el nombre de su descubridor, las células intersticiales de Cajal. La memoria presentada recoge las investigaciones realizadas a lo largo de los 4 últimos años, las cuales han dado lugar a 4 publicaciones diferentes; 3 de ellas basadas en un análisis ultraestructural qu...

  8. Aportaciones al conocimiento de la orquidoflora palentina (España)

    OpenAIRE

    Ruiz de Gopegui, Antonio; Paz Canuria, Elena de; Alonso Redondo, Raquel; Ferreras, Noelia; García, Raquel M.; Alonso Redondo, Sara; Rodríguez, Alberto; García González, Marta Eva

    2010-01-01

    En este trabajo se comentan hallazgos de orquídeas poco conocidas en el territorio palentino, se aportan algunas novedades para la provincia y se comentan algunos datos de provincias limítrofes. Puesto que el grupo de orquidáceas ha suscitado un especial interés en los estudios concernientes a flora rara y amenazada, se detalla el estatus de conservación de aquellos táxones incluidos en documentos técnicos y listados ofi ciales de protección de flora.

  9. Core stability. Concepto y aportaciones al entrenamiento y la prevención de lesiones

    OpenAIRE

    F.J. Vera-García; D. Barbado; V. Moreno-Pérez; S. Hernández-Sánchez; C. Juan-Recio; J.L.L. Elvira

    2015-01-01

    En este trabajo presentamos una revisión de la literatura científica sobre la estabilidad de la zona central del cuerpo (core stability) con el objeto de clarificar el significado de este concepto y su relación con el rendimiento y las lesiones deportivas. Los resultados de la revisión indican que el uso del término core stability es ambiguo, existiendo una gran confusión terminológica tanto en la literatura científica como en el ámbito profesional. Diversos estudios biomecánicos y epidemioló...

  10. Aportaciones de la psicología experimental al análisis del efecto placebo

    OpenAIRE

    Ramón Bayés; F. Xavier Borrás

    1993-01-01

    La psicología del aprendizaje ha propuesto un modelo del "efecto placebo" basado en los procesos de condicionamiento clásico. Esta concepción ha recibido soporte empírico del condicionamiento de las respuestas fisiológicas inducidas por drogas. Más recientemente, la psiconeuroinmunología ha demostrado el condicionarnento de las respuestas inmunológicas y su impacto en la salud. Estos datos han ampliado el análisis experimental del efecto placebo como una respuesta condicionada ...

  11. Aportaciones de la psicología experimental al análisis del efecto placebo

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    Ramón Bayés

    1993-01-01

    Full Text Available La psicología del aprendizaje ha propuesto un modelo del "efecto placebo" basado en los procesos de condicionamiento clásico. Esta concepción ha recibido soporte empírico del condicionamiento de las respuestas fisiológicas inducidas por drogas. Más recientemente, la psiconeuroinmunología ha demostrado el condicionarnento de las respuestas inmunológicas y su impacto en la salud. Estos datos han ampliado el análisis experimental del efecto placebo como una respuesta condicionada y sugieren la aplicación del condicionamiento a los tratamientos farmacoterapéuticos.

  12. Nuevas aportaciones al diagnóstico de las enfermedades causadas por las micobacterias

    OpenAIRE

    Manterola Martija, Joxe Mari

    2004-01-01

    Las micobacterias se pueden detectar por examen microscópico, por demostración de su ADN o rRNA específico tras amplificación del ácido nucleico correspondiente o por cultivo. Para aislarlas por cultivo, hace falta tratar las muestras con flora comensal (esputos, orinas, etc.) con diferentes sustancias, proceso llamado descontaminación.El objetivo de la Tesis ha consistido en evaluar: a) un nuevo método de descontaminación de muestras clínicas con C18-carboxypropilbetaína (CB-18) y compararl...

  13. Aportaciones de la ecografia de la semana 12 al control gestacional en gestaciones únicas

    OpenAIRE

    Sanz de Galdeano Aleixandre, Elena

    2009-01-01

    INTRODUCCIÓN El marcador de aneuploidías más potente descrito hasta el momento es la medida de la Translucencia Nucal (TN) en la ecografía de la semana 12 de gestación, consiguiéndose mediante la combinación de los riesgos derivados de la edad materna y la TN medida una tasa de detección del 75% para una tasa de positivos del 5%. En este trabajo se resumen los resultados del programa de cribado de aneuploidías en el primer trimestre de gestación que se puso en marcha en el Hospital G...

  14. Aportaciones del feminismo al Derecho Internacional en la construcción de la paz

    OpenAIRE

    Álvarez Molinero, Natalia

    2007-01-01

    El feminismo y el Derecho Internacional conforman un par relativamente reciente. Si bien existe una tendencia a enmarcar la intersección entre ambos en el ámbito de los derechos de las mujeres, lo cierto es que el feminismo va mas allá de las reclamaciones de derechos. El feminismo nos sitúa en el marco de las relaciones de poder y género que afectan no sólo a las mujeres, sino también a toda la sociedad. En situaciones de conflicto el feminismo se revela como una interesant...

  15. Aportaciones educativas del Tercer Mundo ante el tercer milenio

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    María Isabel Miró Montoliu

    1998-01-01

    Full Text Available Después de una introducción sobre las actitudes ante el nuevo milenio, el artículo se estructura en cuatro grandes apartados. Se aborda primeramente la realidad actual y la problemática propia del Tercer Mundo aportando datos recientes y expresivos al respecto. A partir de ahí, se re flexiona sobre el Desarrollo Social necesario y las políticas convenientes a seguir en consecuencia, considerando que la educación es la clave en que radica el motor fundamental para encontrar modelos innovadores que puedan superar los obstáculos que impiden la evolución perfectiva de la humanidad. El cuarto apartado incide en el espíritu que debe animar las acciones de ayuda al Tercer Mundo que es el de la COOPERACION y la INTERCULTURALlDAD resaltando los beneficios mutuos del contacto entre los países del mundo desarrollado y aquellos otros, con escasos bienes económicos . pero con valores culturales propios que pueden aportar su riqueza experimental y existencial a la uniformidad del pensamiento único e instrumental predominante en el mundo occidental. 

  16. APORTACIONES DE LA PNL A LA EDUCACIÓN EMOCIONAL

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    Mayca Pérez Asensio

    2012-05-01

    Full Text Available La PNL (Programación neurolingüística es un conjunto de técnicas y habilidades que mejoran nuestras comunicaciones interpersonales, nos amplían la propia  perspectiva, lo que nos ayuda al crecimiento personal,  con hondas repercusiones en el aprendizaje. Sobre la base científica de lo que conocemos del cerebro, nos ayuda a descubrir nuestro mapa de la realidad, de nuestras representaciones –imágenes, sonidos, sensaciones, recuerdos, estímulos, etc.- sobre los que se ancla el PNL en el aula, permitiendo la expresión de las emociones y de la acción a ellas vinculada.

  17. Circuito cerrado para una industria sostenible, aportaciones del sector cementero

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    Zaragoza, A.

    2010-03-01

    Full Text Available The search of a sustainable development for the industry can only be understood from a global approach which takes account of both the industrial activity and the product. Industrial activity needs adding new systems to the production process that minimize its impact reducing the consumption of resources and atmospheric emissions. The product must incorporate sustainable features such as the capacity to be recycled and/or valorised throuhgout its life cycle and, so, being reintroduced again in the industrial activity. This way, product turns into the cornerstone of a “closed circuit” production system that involves all industrial sectors in recycling products and waste and minimizes the frootprint of the process. Cement sector must continue insisting on the development of recycling of cementicious maerials and also on the recycling of materials during its production, and, especially, we must continue studying in depth the relationship between Life Cycle and recycling, which will provide the sector with a methodology and with useful tools to reduce the environmental impact. Therefore, the sector is making efforts for achieving an industry in “closed circuit”, in which materials and energy are re-used, minimizing to the maximum its affection to the environment. At the same time, we are working on the conceptualizing of this production model that involves all the industrial sectors in material recycling. As a reuslt of this commitment, cement industry has signed aggrement of colaboration with FER and Sigrauto to use vehicles out of use and with UNESID to valorise steel waste and also the project Pressure for a global management of industrial waste.

    La búsqueda del desarrollo sostenible para la industria sólo puede entenderse desde un enfoque global que abarque tanto la actividad industrial como el producto. La actividad industrial necesita incorporar al proceso productivo soluciones que minimicen su impacto reduciendo el consumo

  18. Aportaciones de la Programación Neurolingüística a la educación

    OpenAIRE

    Fuentetaja Alonso, Ana Isabel

    2014-01-01

    Este trabajo de documentación sobre PNL y educación consta de dos partes. En la primera se repasan los fundamentos y las herramientas de la Programación Neurolingüística (PNL) y la segunda está dedicada a documentar las aportaciones de la PNL a la educación y a una recopilación de actividades para realizar en el aula. Para finalizar se concluye que la PNL tiene herramientas que pueden ayudar en la labor educativa.

  19. Aportaciones al diseño y caracterización del motor lineal de reluctancia autoconmutado

    OpenAIRE

    García Amorós, Jordi

    2010-01-01

    In this study two electromagnetic analytical models have been developed. From this models the main magnetic and mechanics characteristics are obtained, and also permit getting the principal dimensions of the LSRM. From this results a prototype has been built, which has been examined by means of finite elements and experimental tests which corroborate the validity of the contributed analytic models. The study contains the status of art and the classification of the linear actuators...

  20. Análisis de las aportaciones de los blogs educativos al logro de la competencia digital

    Directory of Open Access Journals (Sweden)

    Virginia Aznar Cuadrado

    2010-03-01

    Full Text Available Hoy en día se está imponiendo como herramienta educativa el uso de Blogs dentro del sistema educativo formal. Todo ello ha conformado un nuevo enfoque de colaboración donde el aprendizaje ha tomado una relación más íntima con nuevos medios de enseñanza y aprendizaje. Nuestro trabajo tiene como objetivo analizar, por un lado, qué modalidades de blogs son los que se utilizan en el aula, y por otro lado cuáles son las finalidades que se les dan a estos Edublogs en los diferentes niveles educativos no universitarios en nuestro país. Para este estudio se han tomado como muestra un total de 374 blogs educativos contenidos en los directorios de Blogs Científicos y Educativos de España, Blogfesores y Aulablog. Consideramos que estos directorios son algunos de los que recogen un amplio abanico de Edublogs.

  1. Aportaciones al Currículo de Matemáticas para la Economía y Empresa

    Directory of Open Access Journals (Sweden)

    Seijas Macías, J. Antonio

    2009-01-01

    Full Text Available RESUMEN La importancia del currículo para la docencia de una asignatura viene dada porque en él se concretan las decisiones que el profesorado toma en relación a ella. El tema adquiere un especial protagonismo ante la inminente aparición de los nuevos grados académicos en el marco del espacio europeo de educación superior. ¿En qué fuentes nos inspiramos para el diseño del currículo de una materia como Matemáticas Aplicadas a la Economía y Empresa? Entre las muchas variables y posibilidades que es necesario tener en cuenta hemos considerado, como prioritaria, las matemáticas que se usan como herramientas en un primer curso de Economía (por ejemplo para cursar unos Principios de Microeconomía y Macroeconomía. En consecuencia, el trabajo que aquí presentamos se puede considerar sólo una primera reflexión en esta línea.ABSTRACT The importance of the curriculum for the teaching of a subject is given because it materializes the decisions that teachers take in relation to it. The issue acquires a special prominence to the imminent appearance of new degrees in the European Higher Education Area. What sources inspired us to design a curriculum area such as Mathematics Applied to Economics and Business? Among some many variables and possibilities should be taken into account, we have considered as priority the mathematical tools that are used as a first course in economics (eg: Principles of Microeconomics and Macroeconomics. Consequently, the work presented here can be considered only a first reflection on this line.

  2. Nuevas aportaciones al motor eléctrico de flujo axial con rotor conductor sin material ferromagnético

    OpenAIRE

    López López, José

    2000-01-01

    En la tesis, se estudian máquinas eléctricas de flujo axial con rotor conductor sin elementos ferromagnéticos. Se pretende construir un motor de flujo axial, que se alimente con densidades de corriente elevadas para arrastrar un rotor conductor en forma de disco de 30 cm de diámetro. Se estudia el comportamiento térmico de un motor comercial de flujo axial y se comprueba el aumento de potencia que es capaz de suministrar el motor, siempre que se puedan disipar las pérdidas por efecto joule y ...

  3. Un grano de sal: aportaciones etnoarqueológicas al estudio histórico de una industria ancestral

    OpenAIRE

    Castellón Huerta, Blas Román

    2012-01-01

    La sal, condimento alimenticio común que actualmente puede ser adquirida con facilidad y cuyo empleo es de gran importancia para la industria química moderna, posee una historia tan apasionante como insospechada. Este mineral tan asociado a la historia de la humanidad ha sido empleado en la antigüedad como conservador de pescado o carne, como fijador en el empleo de tintes vegetales o minerales, como ingrediente de valor medicinal y también como valor de intercambio y de acumulación de ...

  4. New data for the discussion about combustion, dioxin and health; Nuevas aportaciones al controvertido debate sobre incineracion, dioxinas y salud

    Energy Technology Data Exchange (ETDEWEB)

    Domingo, S. L. [Universidad Rovira i Virgili. Reus. Tarragona (Spain)

    2000-07-01

    Dioxin (2,3,7,8-tetrachlorodibenzo-p-dioxin, TCDD) is created unintentionally as a byproduct of human activities such as combustion, paper belaching, and manufacture of chlorine and organochlorine chemicals. Most information concerning human health risks of dioxin is based on highly exposed industrial cohorts with well established high levels of exposure to TCDD. However, information regarding to the health effects from chronic exposure to low levels of dioxin is very scarce. This paper has two main goals. Firstly, to review the most known international affairs related with a massive exposure to dioxin. Secondly, to assess if the pronounced reduction detected in the emissions of dioxins and furans by the MSWI of Tarragona (Spain) would also result in a notable decrease in the levels of dioxins in environmental matrices collected in the vicinity of the MSWI. The current results show that in comparison with the emission sources of dioxins and furans in the same area of the facility, the health risks due to the current emissions of dioxins and furans by the plant would be of small significance for the population living in the neighbour hod. Moreover, we also show that the daily consumption of 200 g/day of semiskimmed milk instead of the same amount of whole milk would be much more relevant to decrease dioxin exposure that the reduction in dioxin emissions resulting from the technical improvements carried out recently in the MSWI. (Author)

  5. Aportaciones al conocimiento de la flora halófila de Andalucía (S. España)

    OpenAIRE

    Lendínez, María Luisa; Marchal Gallardo, Francisco Manuel; Quesada Rincón, Juan; Salazar Mendías, Carlos

    2009-01-01

    Como resultado del estudio de la flora de los ecosistemas halófilos de Andalucía, se muestran 13 taxones halófitos de los cuales 9 constituyen primeras citas provinciales, 1 es citado por primera vez en Andalucía, 2 son primeras citas para Andalucía Oriental, y 6 amplían considerablemente su área de distribución fitogeográfica conocida. Otras 3 citas provinciales, aún no siendo totalmente novedosas, se han incluido en este trabajo por refrendar con pliego de herb...

  6. Aportaciones al diseño y a la caracterización del motor de reluctancia autoconmutado

    OpenAIRE

    Torrent Burgués, Marcel

    2002-01-01

    En los últimos años, investigadores de diferentes laboratorios y universidades han mostrado un interés creciente en el estudio del motor de reluctancia autoconmutado (SRM). Aunque sus aplicaciones industriales son escasas se presenta como una alternativa a los accionamientos convencionales debido a su construcción simple y robusta, a sus bajos costes de manufactura y a su elevado rendimiento, además de poder escoger entre diversas topologías de convertidor estático, prácticamente todas tolera...

  7. Aportaciones al análisis de datos de calidad de vida relacionada con la salud, desde una perspectiva multivariante

    OpenAIRE

    Sánchez Barba, Mercedes

    2008-01-01

    El objetivo de este trabajo es realizar un estudio crítico del cuestionario especifico QUALEFFO (BADIA, 1996) tradicionalmente utilizado para valorar Calidad de Vida en pacientes osteoporóticos, dentro del ámbito hospitalario, y analizar su comportamiento dentro de la Atención Primaria. Para ello utilizamos la TRI la cual permite hacer un estudio a nivel de los diferentes ítems que componen el cuestionario. Tradicionalmente se ha asumido que la Osteoporosis es un problema asociado a las mujer...

  8. Aportaciones al e-learning desde un estudio de buenas prácticas en las universidades andaluzas

    OpenAIRE

    María del Carmen LLORENTE CEJUDO; Julio CABERO ALMENARA; Morales Lozano, Juan Antonio

    2013-01-01

    La presencia y el desarrollo de las tecnologías de la información y la comunicación (TIC) resulta cada vez más apreciable en todos nuestros ámbitos, y son muchos los esfuerzos que las universidades de todos los países efectúan para incorporarlas a actividades tales como la gestión, la investigación o la docencia. Es en este contexto en el que surge el estudio que exponemos en el presente artículo, cuyos propósitos principales se declararon en los siguientes términos: a) identifica...

  9. Contributions of human paleohistology to the study of biomaterials; Aportaciones de la paleohistologia humana al estudio de biomateriales

    Energy Technology Data Exchange (ETDEWEB)

    Nacarino Meneses, C.; Cambra-Moo, O.; Rodriguez Barbero, M. A.; Gonzalez Martin, A.

    2012-07-01

    The deep study of archaeological human bone could provide relevant information to biomaterials science, as it could tell how the implant process of bio glasses and bioresorbable ceramics is. In this paper, we propose to study, by means of different microscopic, spectroscopic, and X-ray diffraction techniques, the histological and mineral bone variability throughout ontogeny. Extrapolating this data, we could have a better knowledge of biodegradable materials implant. In different ages, we could notice different tissues in cortical bone: fibrolamellar bone is characteristic of early stages of life while secondary or harvesian bone is in adult individuals. Raman and infrared spectroscopy suggest an increase of critallinity in the inorganic matrix during live. Finally, the X-ray diffraction study of bone tissue shows {beta}-calcium phosphate and hydroxyapatite as the main mineral bone components. (Author) 31 refs.

  10. Análisis de las aportaciones de los blogs educativos al logro de la competencia digital

    OpenAIRE

    Virginia Aznar Cuadrado; Jorge Soto Carballo

    2010-01-01

    Hoy en día se está imponiendo como herramienta educativa el uso de Blogs dentro del sistema educativo formal. Todo ello ha conformado un nuevo enfoque de colaboración donde el aprendizaje ha tomado una relación más íntima con nuevos medios de enseñanza y aprendizaje. Nuestro trabajo tiene como objetivo analizar, por un lado, qué modalidades de blogs son los que se utilizan en el aula, y por otro lado cu&am...

  11. ¿La Historia oral en las aulas de infantil y primaria? posibles aportaciones y propuestas de aplicación

    OpenAIRE

    Fuertes Muñoz, Carlos

    2014-01-01

    El objetivo de este artículo es reflexionar, a partir de una revisión bibliográfica, sobre la difusión de los usos educativos de la historia oral. Particularmente, pretendemos estimular el debate sobre sus aportaciones para la enseñanza de la historia y las ciencias sociales en las aulas de educación infantil y primaria. Asimismo, propondremos diversas actividades para su utilización en estos niveles

  12. Femicidio y feminicidio: un análisis de las aportaciones en clave iberoamericana

    OpenAIRE

    Boira, Santiago; Marcuello-Servós, Chaime; Otero, Laura; Sanz, Belén; Vives Cases, Carmen

    2015-01-01

    La violencia contra las mujeres es una lacra de nuestra sociedad que no se consigue erradicar. En su versión extrema e irreversible terminar con la muerte de la víctima. Desde mediados de la década de los años 70, del siglo pasado y de la mano de Diane Russell se visibilizaron los femicidios como el asesinato de una mujer por el hecho de ser mujer. Posteriormente, en los años 90, Marcela Lagarde crea el neologismo feminicidio al traducir la obra de Rusell al español. Desde entonces ambo...

  13. Aportaciones sobre las distribuciones del bastón roto y de pielou

    OpenAIRE

    García Nieto, María Hortensia

    2014-01-01

    [ES]En el Capítulo I se hace referencia al concepto de diversidad, sus componentes y los distintos métodos para su medición. En el Capítulo II tratamos al modelo del Bastón Roto, modelo propuesto por McArthur en 1957 y que además de ofrecer la mayor igualdad de abundancia de especies encontrada en la naturaleza, está caracterizado por un único parámetro, S (número de especies). El tratamiento del modelo del Bastón Roto como distribución de probabilidad es un enfoque novedoso y que hemos in...

  14. Aportaciones del tratamiento de imágenes a la dosimetría en radioterapia

    OpenAIRE

    Díez Domingo, Sergio

    2001-01-01

    RESUMEN En la radioterapia moderna prácticamente toda la información anatómica del paciente que va a ser sometido a un tratamiento se obtiene a partir de múltiples imágenes digitales que proceden de diversos equipos generadores de imagen (radiógrafos digitales, tomógrafos, equipos de resonancia magnética etc.). Las cada vez más sofisticadas propuestas de tratamiento están condenadas al fracaso si la información anatómica inicial del paciente es insuficiente o incorrecta. Asimismo, la im...

  15. Beneficios y aportaciones de la música en la escuela

    OpenAIRE

    González, Antía

    2012-01-01

    La educación musical: la música se puede definir como el arte con el cual se pueden unir los sonidos para poder escucharlos, y por educación entendemos el proceso donde se guía, instruye y se transmiten los conocimientos. De este modo entendemos que la educación musical es al mismo tiempo un arte y un lenguaje de expresión y comunicación teniendo como finalidad principal una educación integral del individuo. Cuando decimos las palabras: juego, movimiento, emociones,... los educ...

  16. La traducción científico-técnica: aportaciones desde los estudios de traducción

    OpenAIRE

    Franco Aixelá, Javier

    2013-01-01

    Tradicionalmente, la traducción científico-técnica ha contado poco en la reflexión tanto lingüística como traductológica por partir de un lenguaje escasamente creativo. Hasta las últimas décadas del siglo XX los investigadores no comienzan a prestarle verdadera atención. En este trabajo se analizan las aportaciones de los estudios de traducción modernos a esta modalidad de transferencia interlingüística. La traductología se desarrolla a partir de una perspectiva textual y se vuelca sobre la o...

  17. La caja de Pandora de la dirección de centros educativos. Aportaciones de una investigación cualitativa

    OpenAIRE

    Vázquez Recio, Rosa; Angulo Rasco, Félix

    2006-01-01

    El artículo recoge las aportaciones de una investigación cualitativa realizada sobre la gestión y la dirección de centros de Educación Infantil, Educación Primaria y Educación Secundaria Obligatoria de la Comunidad Autónoma de Andalucía. En él se abordan aquellas cuestiones que, de un modo u otro, hablan de la complejidad y las controversias que encierra el ejercicio de la dirección: coherencia y coordinación interna en los equipos directivos como elementos clave para la gestion, modelo de di...

  18. El programa multicomponente “Juguemos limpio en el deporte base: desarrollo y aportaciones en la década de 2000-2010”

    OpenAIRE

    Gimeno Marco, Fernando; Sáenz Ibáñez, Alfredo; Gutiérrez Pablo, Héctor; Lacambra Correas, David; París Roche, Fernando; Ortiz Rivas, Francisco

    2011-01-01

    La práctica deportiva en la edad escolar es un fenómeno psicosocial de naturaleza multicausal. En consecuencia, éste carácter multicausal o multivariante es pertinente que se contemple en las aportaciones que, desde una perspectiva teórica, metodológica, científica y/o aplicada, pretendan describir o explicar este fenómeno. El programa multicomponente “Juguemos Limpio… en el Deporte Base” contempla un conjunto de actuaciones que, implementadas tanto de forma independiente como integrada...

  19. Cohesión social e inmigración. Aportaciones científicas y discursos políticos

    OpenAIRE

    Solé, Carlota; Sordè i Martí, Teresa; Serradell, Olga; Alcalde, Rosa; Flecha Fernández Sanmamed, Ainhoa; Petroff, Alisa; Cavalcanti, Leonardo; Parella Rubio, Sònia; Pavez Soto, Iskra; Santamaría Lorenzo, Enrique,; Garzón Guillén, Lluís

    2011-01-01

    A pesar de ser uno de los conceptos más recurrentes entre la comunidad científica y en los discursos políticos, la cohesión social carece de una definición rigurosa y compartida que aglutine toda su complejidad. En el presente artículo, a partir de una revisión de las distintas aportaciones científicas, se definen tres dimensiones de la cohesión social: la cultural, la redistributiva de recursos y la relacional (capital social). Estas tres dimensiones se contrastan con los discursos políticos...

  20. La evaluación de la calidad de la información web : aportaciones teóricas y experiencias prácticas

    OpenAIRE

    Merlo Vega, José Antonio

    2003-01-01

    Completa revisión histórica de la bibliografía existente en torno a los criterios, indicadores y procedimientos de evaluación de la información web. Se analiza de forma objetiva las aportaciones más importantes en este ámbito. El artículo se completa con un análisis de los principales indicadores de evaluación aplicados en los servicios e instituciones que mantienen directorios de recursos en Internet, como WWW Virtual Library, Sosig, Bubl o Aarhus Clearinghouse.

  1. Terapia familiar en contexto psiquiátrico: aportaciones para la compresión del cambio psicoterapéutico

    OpenAIRE

    Dias Sales, Célia María

    2006-01-01

    Nos hemos ocupado de la Terapia Familiar. Lo hemos hecho en un contexto Clínico Psiquiátrico. Nuestro interés es hacer aportaciones para compresión del Cambio Psicoterapéutico. ¿Qué es lo que ocurre, en las sesiones de terapia familiar, que provoca el cambio? Esta ha sido la cuestión inicial de la investigación. Para explotarla, se han desarrollado tres líneas de trabajo, bajo el encuadre metodológico del paradigma del cambio: (1) Averiguar de la importancia del periodo intercesiones pa...

  2. El desarrollo sustentable: aportaciones de la escuela austriaca de economía

    Directory of Open Access Journals (Sweden)

    Edgar Piña Ortiz

    2005-01-01

    Full Text Available Se argumenta en este artículo que Ludwig von Mises, miembro distinguido de la escuela austriaca de economía, debe ser colocado como precursor de la sustentabilidad del desarrollo, aun cuando en su tiempo el concepto no había emergido a la literatura especializada. Ya en 1949, este economista, autor de Acción humana, un tratado sobre economía, en el capítulo XXII de dicha obra, "Los factores originales no humanos de la producción", examina la teoría de la renta de David Ricardo, a partir de la cual argumenta, desde un punto de vista económico, sobre la explotación de los recursos naturales y sobre el llamado "Mito de la Tierra". Así, con base en una visionaria e irrefutable percepción de la agotabilidad de dichos recursos, Mises supera la concepción ricardiana prevaleciente hasta entonces, consistente en que los poderes de la Tierra eran originales e indestructibles. En disenso de quienes opinan que la ciencia económica es contraria a la lógica de los procesos de la madre naturaleza, en este trabajo se concluye que el desarrollo sustentable es alcanzable mediante la acción organizada de la sociedad sobre los factores de la producción. Cualquier otra racionalidad que se intente imprimir al proceso, lo desvía de su viabilidad.

  3. Enfoque de capacidades y sostenibilidad. Aportaciones de Amartya Sen y Martha Nussbaum

    Directory of Open Access Journals (Sweden)

    Rosa Colmenarejo

    2016-04-01

    Full Text Available La naturaleza interdisciplinar del “enfoque de las capacidades” (ca, por sus siglas en inglés ha hecho que su estudio se encuentre diseminado en un amplio espectro de revistas. Así el case ha asentado en las áreas de la filosofía política o la economía del desarrollo, y ha ampliado su alcance al ser utilizado como marco teórico para la creación de indicadores sobre la privación, la calidad de vida o la salud, o bien para abordar las cuestiones de la educación superior o el impacto de la tecnología en la vida de las personas. Se ofrece una visión general sobre los principales conceptos empleados en ese enfoque, buscando distinguir las propuestas de A. Sen y M. Nussbaum, con el fin de analizar la idea de sostenibilidad y su incorporación en la agenda del enfoque.

  4. Poética y comunicación. Aportaciones a la teoría de la comunicación y a la teoría de los objetos desde las Odas de Neruda

    Directory of Open Access Journals (Sweden)

    Uña, Octavio

    2014-12-01

    Full Text Available The present study is classified within a research line related to elaborated kinds of languages and to the communication theory, in which two types of studies are included, those studies about the poetic work by Octavio Paz and those studies about Gadamer’s thoughts on language and the work of art. We establish a first approach to Neruda’s Elementary Odes form the phenomenological perspective of the objects, the consideration of poetic language and its contributions to communication (Bousoño maintains that “poetry is the type of communication, established by using new words, of a very special kind of knowledge”. Objects that look at and converge toward men, everyday life objects, objects from warm and nearby environments: the construction of objectivity kingdom, “metaphor provider”. A whole poetic inventory from the “at hand” world, from proxemics, an account and a chronicle of the poet’s experience, which is dialogic, and of the heritage of the common experience. Polisemic objects, which express, inform and say “structured sygn systems”.Quiere situarse el presente estudio en una línea de investigación sobre lenguajes elaborados y teoría de la comunicación, en la que se incluyen estudios sobre la obra poética de Octavio Paz y sobre el pensamiento de Gadamer en torno al lenguaje y a la obra de arte. Establecemos aquí un primer acceso a las Odas elementales de Neruda desde la perspectiva fenomenológica de los objetos, la consideración del lenguaje poético y sus aportaciones a la comunicación (“la poesía es la comunicación, establecida con nuevas palabras, de un conocimiento de muy especial índole”, sostiene Bousoño. Objetos que miran y convergen hacia el hombre, objetos de la vida cotidiana, de los entornos cercanos y cálidos: una construcción del reino de la objetividad, “surtidor de metáforas”. Todo un inventario poético del mundo de lo “a la mano”, de la proxémica; un relato y crónica de la

  5. Aportaciones al modelado de la generación fotovoltaica para la planificación de la red de distribución

    OpenAIRE

    Ramón Marín, Miquel

    2012-01-01

    In this thesis it have been explained the problems that the electric distribution companies in Spain have to plan and operate their power networks, having no detailed measurements of instant active power of a large number of non-programmable generators connected to them. The main objective is to reduce errors and difficulties that this lack of information generates. It has been analyzed the specific case of photovoltaic generators (PV), representing at the end of 2011, a 94.6 % of th...

  6. Algunas aportaciones del INIDE al análisis y planeación del futuro de la Educación Básica

    Directory of Open Access Journals (Sweden)

    Carlos Muñoz Izquierdo

    2008-01-01

    de los Estudiantes, por sus siglas en inglés aplicadas a estudiantes de primaria y secundaria en los ámbitos nacional e internacional, arrojaron resultados nada favorables a los alumnos mexicanos. Por ello se han puesto en marcha en nuestro país varios programas compensatorios para mejorar la educación básica a partir de tres estrategias principales que tienen que ver con el fortalecimiento de la oferta escolar, la distribución de becas entre los alumnos de escasos recursos, y la participación de las comunidades educativas en la gestión escolar. En este artículo se aportan evidencias de que esos programas no han producido resultados satisfactorios, por lo que se propone una estrategia alternativa para mejorar la calidad de la educación básica que se imparte en México.

  7. Vigencia y actualidad de las teorías del P. Eximeno expuestas en el "Dell'Origine". Nuevas aportaciones al estudio de la vida y obra eximeniana

    OpenAIRE

    Picó Pascual, Miguel Ángel

    2009-01-01

    Este artículo tiene por objeto realizar un nuevo análisis sobre la contribución a la musicología del jesuita español P. José Antonio Eximeno, permitiéndome presentar los resultados de mis recientes investigaciones y nuevos proyectos basados en las tesis expuestas en la obra de Eximeno Dell'Origine e delle regole della musica. La importancia de esta obra para la práctica musicológica actual es trascendental, debido a sus enfoques sobre filosofía y pedagogía musical, así como por su opinión sob...

  8. ESTANDARIZACIÓN DE METODOLOGÍAS DE ADN ANTIGUO Y SUS APORTACIONES AL ESTUDIO BIOCULTURAL DE POBLACIONES PREHISPÁNICAS

    OpenAIRE

    Aguirre Samudio, Ana Julia; Instituto de Investigaciones Antropológicas; González Sobrino, Blanca Z.; Solís Arrieta, Lilia; Terrazas Mata, Alejandro; Daneels Verriest, Annick; Serrano Sánchez, Carlos; Meza Peñaloza, Abigail; Ramírez Castilla, Gustavo

    2011-01-01

    El estudio del adn antiguo (adna) extraído de huesos cuya antigüedad es de cientos o miles de años es de gran importancia para el análisis de genética poblacional y aporta información a los estudios de arqueología, ciencias forenses y evolución. El adna se encuentra fragmentado en secuencias cortas y ha sufrido modificaciones químicas post-mortem, por lo que es especialmente susceptible a la contaminación. En el presente estudio se muestran los primeros resultados de la estandarización de téc...

  9. Aportaciones al estudio del proceso de combustión turbulenta de chorros en motores diesel de inyección directa.

    OpenAIRE

    García Oliver, José María

    2015-01-01

    El objetivo global de esta tesis está encaminado a la construcción de las herramientas conceptuales necesarias para analizar de forma sencilla los mecanismos físicos que gobiernan el proceso de combustión de los chorros de combustible bajo las condiciones de contorno de un motor Diesel de inyección directa de unos dos litros de cilindrada unitaria altamente sobrealimentado. El trabajo parte del conocimiento sobre el comportamiento del chorro Diesel isotermo existente en el grupo de trabajo en...

  10. ENDESA: inter-organisational cooperation. ENDESA: la cooperacion interempresas. La aportacion de la empresa publica al desarrollo de las pequenas y medianas empresas

    Energy Technology Data Exchange (ETDEWEB)

    1986-01-01

    We are currently witnessing a growing concern on the part of commercial companies, governments and private and public institutions to obtain the maximum benefit from cooperation between large, small and medium-sized companies, given that the development of the latter is fundamental to a country's economy. This concern is a consequence of the the dynamism introduced into industrial relations by the increasing speed of technological innovations, broadening opportunities within the market and the general conviction that small and medium-sized companies need to adapt to the constant increase in specialisation. Some large companies make it their clear policy to lend support to smaller companies by attempting to assist them in making better use of their resources and installations. The adoption of such a policy would seem to be obligatory in the case of public companies when they are leaders in a particular area of activity.

  11. Aportaciones al estudio y desarrollo de la documentación sanitaria: propuesta de un modelo para el sistema de documentación sanitaria en Colombia

    OpenAIRE

    Rueda-Clausen Pinzón, Christian Eduardo

    2013-01-01

    Un sistema sanitario es funcional y eficiente si todas las partes y sus integrantes tienen un fluido intercambio de información, ésta, a su vez, debe poseer unas características irrenunciables para cumplir la función integradora del Sistema. Los postulados de la documentación aplicados a salud, así como los principios de la calidad, ofrecen un escenario muy propicio para desarrollar soluciones a problemas relacionados con la información sanitaria. El sistema de salud colombiano está inmerso e...

  12. Aportaciones al diseño de circuitos para comunicaciones de baja tensión de alimentación y bajo consumo

    OpenAIRE

    Muñoz Chavero, Fernando

    2002-01-01

    Una de las líneas de investigación por el... En los últimos años los sistemas de comunicación han experimentado un avance expectacular. La reducción de la escala de integración de los circuitos integrados ha permitido aumentar la velocidad y la funcionalidad que incorporan los circuitos de comunicaciones. Todo ello ha posibilitado el desarrollo de nuevos servicios impensables hace dos décadas (bluetooth, GPRS, radio digital, etc). Si bien a esta nueva era de las comunicaciones se le ha dado ...

  13. Aportaciones al desarrollo de herramientas para la optimización del dimensionamiento de microredes con Energías Renovables

    OpenAIRE

    Prieto Rábano, Carlos - A.

    2015-01-01

    El origen del proyecto se sitúa en una oferta de trabajos académicos relacionados con la generación polienergética en microredes con energías renovables, del Cepima de la UPC. El proyecto representa la continuación de trabajos anteriores en el campo de la optimización de las microredes con energías renovables. Uno de los retos de la sociedad actual, es la incorporación de las energías renovables a mucha mayor escala que la actual, además del ahorro de recursos y la eficiencia ...

  14. Aportaciones al estudio arqueológico del mudéjar en la Alpujarra: las iglesias de planta de cajón

    Directory of Open Access Journals (Sweden)

    Montes Rivas, Antonio

    2014-12-01

    Full Text Available This study approaches the standing remains of several Mudejar churches in the Alpujarra region. By means of the archaeological analysis of its walls, the revision of those related written sources and the study of its urban and territorial context, the hall-like plan churches are characterized as a singular typology of this region. This work has made possible as well to improve the knowledge of the parish introduction in the rural area of the Nasrid kingdom in Granada in the Christian period and of those buildings in use during that period in the region.En este artículo se aborda el estudio de los restos emergentes de varias iglesias mudéjares en la comarca de la Alpujarra. A través del análisis arqueológico de paramentos llevado a cabo, así como del examen de las fuentes escritas y el análisis del contexto urbanístico y territorial, se han caracterizado las iglesias de planta de cajón como una tipología propia del mudéjar alpujarreño. A la vez se ha mejorado el conocimiento tanto de la implantación parroquial en este medio rural del antiguo Reino nazarí de Granada, ya en época cristiana, como de la historia de los edificios que evolucionaron a la par que su territorio.

  15. Nuevas aportaciones al estudio del minisatélite humano MsH42, filogenia, digestión y paradojas

    OpenAIRE

    González Blanco, Miguel (Biólogo)

    2005-01-01

    MsH42 es una secuencia de tipo minisatélite del genoma humano localizada en la banda cromosómica 15q25.1. Este minisatélite presenta un bajo polimorfismo y ha sido previamente relacionado con procesos recombinatorios in vitro. En esta Tesis Doctoral nos hemos propuesto conocer el origen e historia evolutiva de este locus, así como la caracterización de posibles puntos de corte de doble cadena (DSB) que pudiesen estar promoviendo los procesos recombinatorios descritos. Hemos descubierto que Ms...

  16. Romeu y la Guerra del Francés: Aportaciones del drama valenciano al desarrollo de la competencia sociolingüística

    OpenAIRE

    Mª Begoña Gómez Devís

    2015-01-01

    El trabajo que presentamos abarca un amplio objetivo: dotar a los aprendices de recursos y estrategias de expresión y comprensión, así como de conocimientos para reflexionar sobre los usos lingüísticos y no lingüísticos disponibles en situaciones y contextos variados. El diseño de nuestra propuesta se articula en torno a tres ejes: el histórico, visión de los acontecimientos de la guerra de la Independencia a través de la figura del guerrillero saguntino José Romeu Parras; el literario, acerc...

  17. Romeu. Aportaciones del drama valenciano al desarrollo de la competencia sociolingüística en la formación del maestro

    OpenAIRE

    Gómez-Devís, María Begoña

    2016-01-01

    Esta aportación aborda el desarrollo de la competencia sociolingüística en situaciones de contacto de lenguas orientándose, principalmente, en el análisis de una obra literaria y en la formación de futuros maestros. El trabajo abarca un amplio objetivo: presentar recursos y conocimientos que activen estrategias de abordaje y permitan armar actividades para reflexionar sobre los usos lingüísticos disponibles en situaciones y contextos variados. El diseño de nuestra propuesta se articula en tor...

  18. Aportaciones de la economía del comportamiento en política sanitaria: Algunas notas en torno al ejemplo de la obesidad

    OpenAIRE

    ANNA GARCÍA-ALTÉS

    2013-01-01

    Los economistas del comportamiento estudian los efectos de los factores sociales, cognitivos y emocionales en las decisiones económicas de los individuos y las instituciones, y sus consecuencias. El paternalismo libertario defiende que las entidades del sector público y privado orienten las elecciones de la gente hacia direcciones que mejoren su calidad de vida. A partir del conocimiento de cómo la gente toma decisiones y sus sesgos, se pueden diseñar estrate- gias para que se tomen las más s...

  19. Aportaciones al comportamiento resistente de estructuras de hormigón armado afectadas por la corrosión de sus armaduras

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    García Alonso, María Dolores

    1996-06-01

    Full Text Available Reinforcement corrosion is one of the main causes of the early deterioration of reinforced concrete structures. This Doctoral Thesis deals with the consequences of corrosion on two basic aspects of the performance of structures: the mechanical properties of steel and steel-to-concrete bond. For this matter, an experimental program and a theoretical model are developed taking into account the main parameters which influence the studied themes.

    Una de las principales causas que origina el deterioro prematuro de las estructuras de hormigón armado es la corrosión de las armaduras. La presente Tesis aborda la incidencia de la corrosión en dos aspectos básicos del comportamiento estructural: las propiedades mecánicas del acero y la adherencia acero/hormigón. Para ello, se desarrolla un programa experimental y un modelo teórico teniendo en cuenta los principales parámetros que intervienen en los temas estudiados.

  20. Aportaciones de la pedagogía de Paulo Freire a la educación intercultural: posibilidades de aplicación al sistema educativo de Asturias

    OpenAIRE

    Verdeja Muñiz, María

    2015-01-01

    En la presente investigación realizamos un estudio y análisis de una parte de la obra escrita de Paulo Freire y establecemos un marco teórico de referencia centrado en aspectos tales como su pensamiento pedagógico-político, su sensibilidad intercultural y la vigencia y actualidad de sus planteamientos. En otro plano de análisis, abordamos la interculturalidad en el sistema educativo español haciendo para ello un recorrido por la legislación educativa en el ámbito nacional y en el autonómico ¿...

  1. ALS Association

    Science.gov (United States)

    ... 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 ...

  2. Aportaciones de la inteligencia emocional y la autoeficacia : aplicaciones para la selección de personal

    OpenAIRE

    García Izquierdo, Antonio León; García Izquierdo, Mariano; Ramos Villagrasa, Pedro José

    2007-01-01

    El objetivo de este artículo es comprobar la mejora de la validez orientada al criterio de la inteligencia emocional y la autoeficacia como variables predictoras del rendimiento en un proceso de selección de personal. Mediante un diseño transversal, y utilizando un modelo de predicción múltiple y regresión jerárquica, hemos elaborado varios modelos predictivos en los que se incluyen variables de personalidad (Cinco Grandes), aptitudes y datos biográficos. Los resultados obtenidos indican la r...

  3. Sobre los orígenes de la sociedad asturleonesa: aportaciones desde la arqueología del territorio

    OpenAIRE

    Gutiérrez González, José Avelino

    1998-01-01

    El objetivo de este trabajo es presentar nuevas vías de análisis histórico-arqueológico sobre la transición del mundo antiguo al feurdalismo en el norte peninsular basadas en la evolución y transformación de los patrones de asentamiento y modelos de ocupación y explotación del territorio, así como sobre las relaciones de jerarquización entre los asentamientos desde los periodos anteriores (prerromano, romano y especialmente tardoantiguo) como forma de entender y explicar la génesis de la orga...

  4. Evolución de las aportaciones en embalses de cabecera del Guadalquivir: relación con las tendencias climáticas recientes y repercusión en la planificación hidrológica

    OpenAIRE

    Aguilar Alba, Mónica; Moral Ituarte, Leandro del

    2008-01-01

    Existen crecientes evidencias sobre la disminución de las aportaciones a embalses en diferentes cuencas de la Península Ibérica. Este hecho viene intensificando los indicios de sobrevaloración de las disponibilidades de agua estimadas por la planificación hidrológica. La actual Instrucción de la P.H., mejorada en su versión final (10 de septiembre de 2008) respecto de los borradores anteriores, establece la necesidad de tomar en consideración este riesgo, ordenando manejar las series de aport...

  5. Una mirada más "positiva" a la salud ocupacional desde la psicología organizacional positiva en tiempos de crisis: aportaciones desde el equipo de investigación WONT

    OpenAIRE

    Salanova Soria, Marisa; Martínez Martínez, Isabel M.; Llorens Gumbau, Susana

    2014-01-01

    El objetivo de este trabajo es presentar una síntesis de las principales aportaciones prácticas basadas en la evidencia científica que el equipo WoNT de la Universitat Jaume I ha llevado a cabo en materia de Psicología de la Salud Ocupacional y Psicología Organizacional Positiva en contextos de crisis. En concreto, se presenta la metodología RED (Recursos-Experiencias-Demandas) para la evaluación de riesgos y daños psicosociales, y estados emocionales positivos. Además, se muestra un...

  6. LA REAFIRMACIÓN DE LAS APORTACIONES DE (PROPIEDAD DE LOS SOCIOS DE LAS SOCIEDADES COOPERATIVAS. PROPUESTA DE REGULACIÓN DE LAS SOCIEDADES DE RESPONSABILIDAD LIMITADA COOPERATIVA /THE REAFFIRMATION OF THE CONTRIBUTIONS OF (PROPERTY OF COOPERATIVE SOCIETIES ASSOCIATES. PROPOSAL OF REGULATION FOR SOCIETIES OF LIMITED COOPERATIVE RESPONSIBILITY

    Directory of Open Access Journals (Sweden)

    Carlos GARCÍA-GUTIÉRREZ FERNÁNDEZ

    2006-05-01

    Full Text Available Las denominadas Normas Internacionales (que sólo son europeas de Contabilidad han puesto de manifiesto un problema latente que no es sólo terminológico: reclaman la consideración de recurso ajeno de la rúbrica que recoge las aportaciones de los socios de las sociedades cooperativas, como no podía ser de otro modo al tratarse de empresas en las que la condición de socio no se adquiere por la aportación obligatoria (y, en su caso, voluntaria. La contabilidad pretende, entre otras cosas, ofrecer una imagen fiel de la situación patrimonial y económico-financiera de la empresa. El principio de puerta abierta, establecido por la única organización ¡mundial! que establece lo que es una sociedad cooperativa, conlleva el reembolso de esas aportaciones cuando el socio deja de serlo; lo que configura al impropiamente denominado capital social (debería ser capital aportado por los socios como una deuda, no convencional, pero deuda. Pero el crédito, la confianza del mercado financiera, se basa más en lo que prometen los empresarios que en una relación contable del pasivo (y mucho menos si es engañosa. No se pueden tergiversar las cosas para atender a los derechos de los acreedores de la sociedad (que son sagrados. Éstos ya saben “con quienes se juegan los cuartos”; y, si no lo saben, es su problema. No se puede cargar las tintas sobre los socios actuales a favor de los futuros; y menos aún a favor de los directivos presentes. La sociedad cooperativa es una asociación de empresarios en democracia, cada uno de los cuales… responde de su aportación, si llega el caso; pero no antes, “por si acaso”. Porque esto es antifinanciero, antieconómico y anticooperativo./The denominated International Norms (that are only European of Accounting they have shown a latent problem that is not only terminological: they claim the resource consideration unaware of the heading that picks up the contributions of the partners of the cooperative

  7. Contribuciones al estudio de la motivación laboral: enfoques teóricos desde la dimensión de autoexpresión del ser humano

    OpenAIRE

    SONIA AGUT NIETO; VIRGINIA CARRERO PLANES

    2007-01-01

    El objetivo de este trabajo es integrar las principales aportaciones al estudio de la motivación humana, prestando especial atención a las más aplicadas para la explicación del comportamiento relacionado con el trabajo, pero desde un criterio clasificador distinto de los utilizados hasta ahora: la condición de autoexpresión del individuo como fuerza fundamental que activa, dirige y mantiene el comportamiento de las personas. Esto nos lleva a agrupar las teorías en tres categorías, en función ...

  8. Cohesión social e inmigración. Aportaciones científicas y discursos político

    Directory of Open Access Journals (Sweden)

    Flecha Fernández de Sanmamed, Ainhoa

    2011-03-01

    Full Text Available Despite being one of the most used concepts by the scientific community and in political discourses, social cohesion lacks of a rigorous and shared definition. In this article, based on a literature review, three dimensions of social cohesion are defined in relation to cultural diversity, the redistribution of resources and social capital. These dimensions are contrasted with the political discourses underlying migration policies at the European, Spanish and Catalan level. The authors conclude that the three dimensions are to greater or lesser extent present in the political discourses, although they differ in priorities rather than in the substantive core.

    A pesar de ser uno de los conceptos más recurrentes entre la comunidad científica y en los discursos políticos, la cohesión social carece de una definición rigurosa y compartida que aglutine toda su complejidad. En el presente artículo, a partir de una revisión de las distintas aportaciones científicas, se definen tres dimensiones de la cohesión social: la cultural, la redistributiva de recursos y la relacional (capital social. Estas tres dimensiones se contrastan con los discursos políticos subyacentes en las políticas migratorias europeas, españolas y catalanas. En todos ellos se identifica una voluntad de construir un marco de referencia común, que reconozca la diversidad cultural, como también la necesidad de garantizar el acceso a los derechos básicos como un medio hacia la cohesión social. Se concluye que las tres dimensiones se encuentran en menor o mayor medida en los discursos políticos, diferenciándose más en su priorización que de forma sustantiva.

  9. Comprensión y tratamiento del juego patológico: aportaciones desde la Neurociencia del Aprendizaje

    Directory of Open Access Journals (Sweden)

    Juan F. Navas

    2014-01-01

    Full Text Available En la génesis y el desarrollo del juego patológico entran en juego factores múltiples. No obstante, entre ellos se han considerado de especial importancia los procesos de aprendizaje. La evidencia acumulada desde la Neurociencia del Aprendizaje, que aborda su objeto de estudio desde tres niveles de análisis (conductual, cognitivo y neurobiológico, sugiere que (1 las alteraciones del sistema mesolímbico de la recompensa están ligadas a la sensibilidad a la recompensa de los jugadores patológicos y su vulnerabilidad a los programas de reforzamiento del juego de azar, (2 las anomalías de los sistemas orbitofrontales encargados de computar y contextualizar los beneficios y las pérdidas de las propias decisiones están igualmente vinculados a la alteración en la toma de decisiones, la hiposensibilidad al castigo y la rigidez en el aprendizaje identificadas en esta población y (3, al igual que en otros trastornos adictivos, la alteración de los sistemas prefrontales dorsolateral y dorsomedial de control cognitivo puede dar cuenta de la pobre planificación de las conductas alternativas al juego y el debilita miento de la capacidad para regular los impulsos, incluido el deseo intenso de jugar o craving. Esta evidencia justifica un abordaje terapéutico integral orientado a la rehabilitación de las funciones alteradas. Para ello se plantea la utilización integrada de técnicas habituales propias de la terapia cognitivo-conductual para la reducción de saliencia de incentivo, reducción y control del craving y mejora de la capacidad de planificación e inhibición. Asimismo, se propone el uso de técnicas de economía conductual para impulsar fuentes de reforzamiento más allá del juego y la simulación controlada de episodios de juego para el aprendizaje de la contabilización adecuada de los beneficios y pérdidas monetarios. El uso de estas técnicas en cada caso particular debería ir guiado por la correcta caracterización de las

  10. Aportaciones del sector de telecomunicaciones a la protección en línea del menor

    Directory of Open Access Journals (Sweden)

    Mónica Recalde Viana

    2015-07-01

    Full Text Available El paisaje tecnológico de las pantallas en relación al menor apunta a numerosos desafíos que la industria afronta junto a las familias y el sector educativo. Sin embargo, hay poca bibliografía que ahonde en las políticas estratégicas que está implantando el sector para hacer frente a los retos. Por ello, este artículo tiene dos objetivos: en primer lugar, realizar una síntesis del estado de la cuestión para, seguidamente, presentar los principales hallazgos sobre cómo están afrontando este panorama las 17 principales empresas internacionales en su política comercial y en su relación con grupos de interés. La metodología aplicada es de carácter cualitativo, y analiza los informes de responsabilidad social y webs de las compañías, con el fin de identificar las líneas estratégicas y acciones empresariales, así como las personas e instituciones con quienes colaboran. Los resultados muestran que, pese a algunas diferencias entre regiones, el sector se atiene a un interés por la autorregulación, la innovación en los productos, en las herramientas de protección, así como en el mantenimiento de una estrecha red de colaboraciones con grupos de interés, que permite retroalimentar las políticas y estrategias. De este análisis se concluye que el sector necesita integrar las políticas de protección al menor no solo con el desarrollo de productos responsables, sino estrechando aún más los vínculos con grupos de interés clave como padres e instituciones.

  11. Aportaciones del Comunicado de Londres en el Proceso de Bolonia: conclusiones sobre los programas de doctorado y otros aspectos destacables

    Directory of Open Access Journals (Sweden)

    Guillem Antequera Gallego

    2007-09-01

    Full Text Available El pasado 18 de mayo de 2007, tuvo lugar en Londres el último de los encuentros bienales del Proceso de Bolonia, en el que se reunieron los ministros responsables de la educación superior de los países participantes. En el consiguiente London Communiqué se resumieron las valoraciones de los ministros sobre el estado en el que dicho proceso se halla. Así, se pasó revista a los avances consolidados, a aquellas deficiencias que aún no han recibido la atención necesaria, y a las medidas y estrategias urgentes para su definitiva conclusión. El presente texto da noticia de todas estas cuestiones y, con motivo de ofrecer al lector referencias adicionales sobre el contexto general, incluye una breve síntesis de otros documentos directamente relacionados con los temas más destacados en Londres 2007: los programas de doctorado y la figura del doctorando.The last biennial meeting on the 18th of May 2007 concerning the Bologna Process took place in London with the ministers responsible for higher education from the participating countries. The London Communiqué summarised the ministers’ appraisals of the current situation. Thus, the consolidated improvements were considered together with the deficiencies which not received the necessary attention and the measures and strategies which will be implemented to achieve its final conclusion. This text reports all these issues and adds a synthesis of previous documents concerning the more closely related aspects to the meeting of London 2007, including the doctoral programmes and the profile of PhD student. In this way, the reader will have additional information in a wider context about the last meeting’s more relevant aspects.

  12. Las aportaciones de la sociología española a la responsabilidad social empresarial

    Directory of Open Access Journals (Sweden)

    Blanco, Antonio

    2010-09-01

    Full Text Available In the Conclusion 39 of the European Summit in Lisbon in 2000, the European Council makes a special plea to the sense of social responsibility of companies being such as a voluntary integration in their strategy and actions of their social, economic and environmental concerns, which arise from the interactions between the organizations and their groups of interests. Different international proposals, European and spanish, support the practice of the business responsibility. In Spain, a Forum of Expertise of this matter coordinated by the Ministry of Labour and Social Affairs has recognized “the importance of a new sensibility of the companies about social affairs”. This makes us question if Sociology has also shown interest for this new “sensibility” of the business organizations and which the degree of presence is in corporate social responsibility being also an object of study in the academic field of Sociology. Therefore, the presence of this subject in the research as well as the syllabus of the studies of Sociology in Spain is studied.

    En la Conclusión 39 de la Cumbre Europea de Lisboa del año 2000, el Consejo Europeo hace un llamamiento especial al sentido de responsabilidad social de las empresas, entendiendo por tal la integración voluntaria en su estrategia y acciones de preocupaciones sociales, económicas y medioambientales que surgen de la interacción de las organizaciones con sus grupos de interés. Diferentes propuestas internacionales, europeas y españolas respaldan la práctica de la responsabilidad empresarial y, en España, el Foro de Expertos en la materia coordinado por el Ministerio de Trabajo y Asuntos Sociales ha reconocido el “ascenso de una nueva sensibilidad en las empresas sobre lo social”. Esto nos lleva a cuestionarnos si la Sociología también ha mostrado interés por esta nueva “sensibilidad” de las organizaciones empresariales y cuál es el grado de presencia de la responsabilidad

  13. Jesús Núñez, artista multidisciplinar: lenguaje, estilo y técnica : aportaciones a la enseñanza y difusión de la gráfica contemporánea

    OpenAIRE

    Jiménez Zaballos, María Francisca

    2014-01-01

    La tesis “JESÚS NÚÑEZ, ARTISTA MULTIDISCIPLINAR. LENGUAJE, ESTILO Y TÉCNICA. APORTACIONES A LA ENSEÑANZA Y DIVULTACIÓN DE LA GRÁFICA CONTEMPORÁNA”, está desarrollada en torno a la figura y la obra del autor Jesús Núñez, nacido en Betanzos, A Coruña, en 1927. En ella se recoge y desarrolla su trayectoria artística, creativa y profesional. Está centrada en su lenguaje plástico y la diversidad de sus propuestas técnicas, que ofrecen un lenguaje técnicamente plural y la vez unificado en su concep...

  14. AL Amyloidosis

    Directory of Open Access Journals (Sweden)

    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

  15. El factor h de Hirsch: the h-index: Una actualización sobre los métodos de evaluación de los autores y sus aportaciones en publicaciones científicas The Hirsch’s h-index: An update on the author’s evaluation methods and their contributions in scientific publications

    Directory of Open Access Journals (Sweden)

    Alberto Gálvez Toro

    2006-03-01

    Full Text Available La evaluación de un autor científico-profesional tiene sentido en un sistema competitivo en el que la puntuación más elevada tiene efectos en la carrera del autor o en el acceso a financiación. En el proceso de evaluación hay que considerar dos dimensiones bien diferenciadas que se suelen confundir: el método de medida y la fuente de datos. El primero debe ser universal y válido para todos los autores. El segundo debe estar adaptado al área de conocimiento del autor. Recientemente J.E. Hirsch ha desarrollado un nuevo indicador que parece resuelve los problemas de validez de los sistemas de calculo conocidos hasta ahora. Ese indicador se denomina factor h, y difiere de una comunidad científica a otra, es decir, de disciplina a disciplina, por lo que es necesario desarrollar investigación que defina sus valores en todas las ramas del saber (índice h por disciplina. El valor del número h representa la biografía científica de un autor. No mide inmediatez, sino grandes periodos de tiempo. La actividad científico-profesional es biográfica, por tanto, era necesario crear un indicador que midiera carrera y recorrido. Un autor reconocido en su área, tendrá un mayor factor h al final de su vida profesional que en sus comienzos con independencia de la revista en la que publique o el medio que utilice para la divulgación de sus aportaciones.The evaluation of a scientific-professional author makes sense in a competitive system in which the highest rating has effects in the author’s career or in his access to funding. In the evaluation process it is necessary to consider two differentiated dimensions that are usually confused: the measure method and the data source. The first one must be universal and valid for all authors. The second one should be adapted to the author’s field of study. J.E. Hirsch has recently developed a new indicator that apparently resolves the validity problems of the calculation systems known to date. This

  16. Aportaciones al estudio de las máquinas eléctricas de flujo axial mediante la aplicación del método de los elementos finitos

    OpenAIRE

    Frias Valero, Eduardo

    2004-01-01

    La existencia de máquinas eléctricas industriales desde finales del siglo XIX implica que es un sector de desarrollo maduro donde parecen difíciles nuevos conceptos de máquina, a no ser que el desarrollo de nuevos materiales o tecnologías de fabricación hagan que conceptos de máquina con pocas aplicaciones pase a ser objeto de mejora y optimización. Analizando la literatura de estos últimos años (ver bibliografía), donde se pueden encontrar máquinas nada convencionales, se infiere que los dis...

  17. Análisis de sistemas integrados de producción de hidrógeno a partir de energía eólica aportaciones al modelado dinámico de sistemas

    OpenAIRE

    Pino Lucena, Francisco Javier

    2010-01-01

    Esta tesis profundiza en los modelos matemáticos de sistemas integrados eólica-hidrógeno, particularizando el estudio en la producción de hidrógeno a partir de energía eólica desde un punto de vista dinámico. Además, también ... se aborda la validez de lo

  18. Aportaciones a la respuesta inmune frente a "Chamydophila" en modelo murino, variaciones debidas al genotipo del hospedador y virulencia de la cepa / María Belén Abadías ; direccion Antonio Benabé Salazar.

    OpenAIRE

    Garcés Abadías, María Belén

    2002-01-01

    Tesis-Universidad de Murcia. Consulte la tesis en: BCA. GENERAL. ARCHIVO UNIVERSITARIO. T.M. 2459. Consulte la tesis en: BCA. GENERAL. Fac. Veterinaria. Departamentos. E002B TESIS 98. Consulte la tesis en: BCA. GENERAL. Fac. Veterinaria. Sala de estudio. Tesis-V 185.

  19. Exploración de las aportaciones al trabajo colaborativo y constructivo de la web 2.0 : enseñar y aprender en espacios virtuales en la educación superior

    OpenAIRE

    Trujillo Torres, Juan Manuel

    2010-01-01

    El nuevo perfil docente que la Sociedad del conocimiento y el Nuevo Espacio de Convergencia Europeo reclaman se sitúa en torno a procesos de trabajo fundamentalmente colaborativos en Red. Instrucción activa y promoción del trabajo conjunto en torno a redes profesionales que promuevan la ayuda entre pares, la reflexión elaborada, un clima de respeto y consideración/apreciación de las diferencias. Consecuentemente, el establecimiento de una verdadera cultura de red parece ser clave para que el ...

  20. Aportaciones al conocimiento de la compresión tardía en la Cordillera Ibérica centro-oriental: la cuenca neógena inferior del Mijares (Teruel-Castellón

    Directory of Open Access Journals (Sweden)

    Paricio Cardona, J.

    1986-10-01

    Full Text Available The lower Neogene deposits of the Mijares valley (mainly fluvial facies are filling three paralell• grabens controlled by synsedimentary ENE normal faults. This structural pattern is created during a moderate compression phase with an ENE horizontal σ1 axis which sometimes can be permuted with the vertical σ2. Afterwards. a second SSE to S compression affects these deposits. The age of the basin can be established in the Upper Aragonian-Lower Vallesian bested on the Micromamal fauna found in two localities. Other sites in the cetral-oriental lberian Chain also show compressive deformations in well-dated deposits of Agenian and Aragonian ages. The compression still continues in this region during the Lower and Middle Miocene, the passage to the extension regime talking place in the Vanesian.

    Las facies esencialmente fluviales que integran la unidad interior~ del valle medio del Mijares se depositan en tres grabens paralelos controlados por fallas sinsedimentarias ENE de componente normal. Este dispositivo estructural se crea en el curso de una etapa. compresiva de intensidad moderada, con un σ1 según ENE, que eventualmente se intercambia con σ2 vertical. Una segunda etapa de compresión SSE a S afecta posteriormente a esta unidad, datada en el Astaranciense-Vallesiense gracias a la fauna de micromamíferos proporcionada por dos yacimientos. Otras localidades de la Cadena Ibérica centro-oriental registran asimismo deformaciones compresivas en depósitos bien datados entre el Ageniense y el Aragoniense. Aunque sin producir apenas pliegues, el régimen compresivo perdura aún claramente en este sector de la cadena durante toda la primera mitad del Mioceno, siendo en el Vallesiense cuando se produce el tránsito definitivo a la distensión.

  1. Nuevas aportaciones al estudio de los patrones de asentamiento en el nordeste de la Península Ibérica durante la Primera Edad del Hierro. El caso del Complejo Sant Jaume

    Directory of Open Access Journals (Sweden)

    Garcia i Rubert, David

    2011-12-01

    Full Text Available We presented in this paper the results of archaeological research developed in recent years by GRAP, University of Barcelona, in the territories of the Sénia River, located between Catalonia and Valencia. Advances permit us to explain the settlement pattern in the area of the mouth of the river during the Early Iron Age. We infer from this study that five sites were part of a political-territorial entity, which we have called “Complex Sant Jaume”. We also propose the existence of a hierarchical relationship between the settlements.

    Presentamos los resultados de los trabajos desarrollados en los últimos años por el Grup de Recerca en Arqueología Protohistòrica (GRAP de la Universidad de Barcelona en el área del río Sénia, a caballo de Cataluña y el País Valenciano. Permiten definir el patrón del poblamiento de esta zona durante el Primer Hierro. Deducimos que los cinco yacimientos localizados formaron parte de una entidad político-territorial, que hemos denominado Complejo Sant Jaume. Proponemos la existencia de una relación jerárquica entre ellos.

  2. Genotipado de las especies de Leishmania y variabilidad intraespecífica de L. infantum. Aportaciones al diagnóstico molecular y a la epidemiología de las leishmaniosis

    OpenAIRE

    Tomás Pérez, Míriam

    2015-01-01

    Los trabajos presentados en esta tesis doctoral se han basado en el uso, diseño y optimización de herramientas moleculares para facilitar el diagnóstico de las leishmaniosis humanas y de reservorios animales, así como para favorecer el conocimiento del agente causal a nivel interespecífico e intraespecífico. Para el tipado interespecífico de Leishmania spp se ha optimizado un método basado en la lectura del tamaño de fragmentos marcados con fluorescencia, metodología denominada PCR-FFL (P...

  3. Aportaciones de la economía del comportamiento en política sanitaria: Algunas notas en torno al ejemplo de la obesidad/Contributions of Behavioral Economics in Health Policy: Some Notes Around the Example of Obesity

    OpenAIRE

    García-Altés, Anna

    2013-01-01

    Los economistas del comportamiento estudian los efectos de los factores sociales, cognitivos y emocionales en las decisiones económicas de los individuos y las instituciones, y sus consecuencias. El paternalismo libertario defiende que las entidades del sector público y privado orienten las elecciones de la gente hacia direcciones que mejoren su calidad de vida. A partir del conocimiento de cómo la gente toma decisiones y sus sesgos, se pueden diseñar estrate¬gias para que se tomen las más sa...

  4. Areas de evaluación en el peritaje judicial psicológico en derecho penal: aportaciones de interés

    OpenAIRE

    Aluja Fabregat, Antón

    1996-01-01

    Se hace referencia a la labor de evaluación del psicólogo forense en base a instrumentos psicométricos de uso clínico y a técnicas específicas para la medida de las habilidades cognitivas y personalidad. Al contrario de la gran cantidad de instrumentos de evaluación encontrados en la bibliografía anglosajona, en nuestro ámbito no existen apenas técnicas de evaluación psicológica válidas y fiables para ser aplicadas por el psicólogo forense, al margen de las habituales utilizadas en psicología...

  5. El lugar de visigodos y omeyas en la historiografía de los siglos XIX y XX. Aportaciones a un debate sobre continuidad y ruptura

    Directory of Open Access Journals (Sweden)

    Salvatierra Cuenca, Vicente

    2015-12-01

    Full Text Available This text aims to analyze the evolution during the nineteenth and twentieth centuries paradigms of the historical division between Antiquity and the Early Middle Ages and its impact on Spanish archeology. In a special will be described how and when the concept of late antiquity was introduced, replacing the previous paradigms. Also we try to analyze whether the continuity and process elements connected thereto affect the origins of al-Andalus, discussing the existence of an abrupt and sharp cut from the Arab and Berber invasion.Este texto pretende analizar la evolución durante los siglos XIX-XX de algunos paradigmas en la división histórica entre la Antigüedad y la Alta Edad Media y su repercusión en la Arqueología española. De forma especial se describirá el modo y el momento en que se introdujo el concepto de Antigüedad tardía que desplaza a los anteriores paradigmas. Asímismo se trata de analizar si los elementos de continuidad y proceso conectados al mismo afectan a los orígenes de al-Andalus, discutiéndose si existió un corte brusco y tajante a partir de la invasión árabe y bereber.

  6. La ciudad de abajo arriba. Aportaciones a la práctica y la teoría el urbanismo participativo

    OpenAIRE

    Verdaguer Viana-Cárdenas, Carlos; Velázquez Valoria, Isabela

    2012-01-01

    El artículo constituye la presentación de un número monográfico de la revistsa Habitat Y Sociedad dedicado al urbanismo participativo, de cuya coordinación edición se han encargado los autores. Lo que se intenta en este número es vincular estrechamente la reflexión sobre la forma en que se toman y se deben tomar las decisiones que competen a lo urbano y aquellos temas de sostenibilidad urbana que el actual panorama de crisis global ha contribuido a revelar como claves: la regeneración urb...

  7. Aportaciones de la toponimia a la investigación de la historia del léxico hispánico

    OpenAIRE

    Ruhstaller Kuhne, Stefan

    2015-01-01

    En la toponimia se conserva, de forma fosilizada, abundante información léxica que puede ser aprovechada para complementar la documentación histórica que ofrece la lengua viva reflejada en los textos. Los aspectos de la historia del léxico que pueden ser investigados gracias al estudio toponímico son diversos: detalles cronológicos de la evolución, la existencia de variantes fonéticas y de derivados, cambios en la difusión geográfica, entre otros; a veces incluso se atestiguan a través de los...

  8. Aportaciones para un modelo psicoeducativo en el servicio de psiquiatría del Hospital Civil Fray Antonio Alcalde en Guadalajara, Jalisco, México

    OpenAIRE

    Angélica Jazmín Albarrán Ledezma; Marco Antonio Macías Terriquez

    2007-01-01

    El modelo psicoeducativo es una propuesta dentro del universo de abordajes en salud mental que involucra tanto a profesionales de la salud como a familiares en el proceso de atención al sujeto diagnosticado con un trastorno o enfermedad mental, este modelo procura insertarse como parte de una atención integral y multidisciplinaria. En el presente se narra una vivencia de doce familiares de pacientes hospitalizados en el Servicio de Psiquiatría del Hospital Civil de Guadalajara posterior a su ...

  9. ¿Trabajo social sin fundamento? : aportaciones del paradigma de la complejidad a la epistemología del trabajo social

    OpenAIRE

    Cordero Ramos, Nuria; Blanco López, Juan

    2004-01-01

    El debate sobre la necesaria fundamentación teórica del Trabajo Social está hoy en plena vigencia. La necesidad de "demostrar" su cientificidad es un interés compartido con otras ciencias sociales, que en su caminar epistemológico, han "copiado" el modelo, teórico y práctico, de las ciencias naturales, deudoras del más clásico positivismo racionalista. Sin embargo este modelo "clásico" al que se aspira está puesto en cuestión por estas mismas Ciencias Naturales con la aparición de planteamien...

  10. La selección de contenidos para enseñar naturaleza de la ciencia y tecnología (parte 1): Una revisión de las aportaciones de la investigación didáctica

    OpenAIRE

    Vázquez Alonso, Ángel; Manassero–Mas, María Antonia

    2012-01-01

    Este estudio presenta una revisión de los contenidos para la enseñanza de la llamada “naturaleza de la ciencia” (y tecnología) desde las diversas aportaciones de la investigación didáctica especializada sobre estas cuestiones. La visión que se presenta aquí está relacionada con y es dependiente de diversos conceptos modernos, tales como la situación de profunda interacción entre ciencia y tecnología en la actividad científica actual (tecnociencia), que se traduce en una visión de ...

  11. Comunes urbanos: de la gestión colectiva al derecho a la ciudad

    Directory of Open Access Journals (Sweden)

    Mauro Castro-Coma

    2016-01-01

    Full Text Available Existe un creciente interés y una emergente literatura académica en los estudios urbanos sobre los comunes y su aplicación. Por un lado, destacan aquellas aportaciones que aplican al ámbito urbano, los estudios de Elinor Ostrom sobre las formas de autogestión de los recursos naturales de uso común. Por el otro, la literatura crítica sobre el neoliberalismo, las nuevas formas de acumulación por desposesión y las resistencias a ellas en forma de movimientos sociales también han abordado los comunes en la ciudad desde diferentes perspectivas de origen marxista. En este trabajo se ordenan y se analizan las contribuciones de ambas aproximaciones, sus puntos críticos, así como sus posibles complementariedades, para avanzar hacia una mejor conceptualización y una futura agenda de investigación sobre los comunes urbanos.

  12. All About ALS

    Science.gov (United States)

    ... 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 ...

  13. Aportaciones para el diseño de proyectos multimedia con inclusión de las tic en el ambito de la educación superior

    Directory of Open Access Journals (Sweden)

    Laura Terán Delgado

    2011-02-01

    Full Text Available El presente trabajo tiene la intención de proponer tres atributos indispensables para elaborar proyectos multimedia como apoyo al proceso de enseñanza-aprendizaje en el nivel superior, sirviendo como guía para los docentes y estudiantes que aplican diversas herramientas informáticas al momento de elaborar diversos trabajos con diversas características tecnológicas. Los atributos que se presentan son: Pedagógicos, los cuáles hacen referencia a la selección minuciosa y pertinente del tema, el contenido curricular adecuado, incorporación de metodologías, estrategias y actividades de enseñanzaaprendizaje, elaboración del guión gráfico que incluirá los pasos a seguir y la ubicación del contenido, incorporar un vocabulario de términos técnicos, interactivo y reforzador de los contenidos y mensajes; Tecnológicos, son aquellos que sugieren la aplicación ordenada y pertinente de las herramientas tecnológicas, las cuales establecen normas y criterios para aplicar la tecnología en trabajos prácticos acordes a los niveles educativos en donde se implementará; y de Evaluación, cuya finalidad es determinar en qué medida el producto creado satisface las necesidades y el objetivo planteado en la delimitación del trabajo práctico, evaluando los aspectos Pedagógicos y Tecnológicos

  14. Aportaciones de la Etología Humana a los estudios lingüísticos: el caso de la Fraseología

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    Maria Eugênia Olímpio de Oliveira Silva

    2015-12-01

    Full Text Available En este texto se reflexiona sobre los vínculos existentes entre la Etología Humana, a partir de algunos de los supuestos teóricos desarrollados por Eibl-Eibesfeldt, y la Lingüística. Se busca establecer una relación entre estos supuestos y una parcela de los estudios lingüísticos, la Fraseología (especialmente, las fórmulas rutinarias. A fin de cumplir este objetivo, se describen, someramente, los principios básicos de la Etología Humana; se considera, asimismo, la atención que ha consagrado esta ciencia a la comunicación humana, el lenguaje y la Lingüística, y de la posibilidad de aplicar la Etolingüística al estudio de la Fraseología. En relación con ello, se examina la noción de «universalidad», tal como se plantea en los estudios etológicos, y sus implicaciones en la investigación fraseológica. Se defiende la idea de que la Etología Humana puede apoyar la reflexión sobre las bases innatas y culturales que subyacen a diferentes tipos de fraseologismos.

  15. ESTILOS COGNITIVOS EN LA DIMENSIÓN CIENTÍFICA Y APORTACIONES A ESTILOS DE ENSEÑANZA EN DOCENTES UNIVERSITARIOS DE QUÍMICA

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    Jaime Augusto Casas Mateus

    2016-01-01

    Full Text Available Los estilos cognitivos y los de enseñanza han sido constructos objeto de investigación en las aulas universitarias. El presente ensayo pretende, primeramente, mostrar una condensada síntesis tanto de las tradiciones, desarrollos, enfoques y tendencias como de algunos estudios exploratorios, descriptivos o correlacionales relativos a los dos constructos, lo cual algunas veces implica el estudio de variables intervinientes. En segundo lugar, con una caracterización más integral y específica del profesorado universitario de química, este documento aborda dichos constructos; el estudio pretende ampliar el estado del arte, en dos vías: la primera toma en cuenta la dimensión científica en investigaciones anteriores a 1982 para el estudio del estilo cognitivo; la segunda tiene en cuenta la necesidad de la inclusión del ámbito del laboratorio para el estudio integral del estilo de enseñanza en este colectivo particular. Finalmente, el autor propone avanzar en el diseño y validación de instrumentos relativos a estos dos constructos y, posteriormente, estudiar las correlaciones entre el estilo de enseñanza, sea en el ámbito genérico (en la teoría o en el ámbito específico (en el laboratorio frente al respectivo estilo cognitivo en la dimensión científica en profesorado universitario de química.

  16. Aportaciones sólidas a la atmósfera originadas por un incendio forestal en el ámbito mediterráneo

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    Díaz Hemández, J. L.

    2000-08-01

    Full Text Available Fly ash projected from the Sierra de la Almijara forest fire (Granada, August 1999 into adjacent soils were 252 Tm (0,168 gr/m2; this occurred mainly during the days of the fire. The mechanisms implied in the evolution of the gas clouds accelerate the deposition of the mineral particles suspended in the air. These mineral particles are agglutinated into microspherules by the water vapor released. The global rate of deposition obtained for the week of the forest fire underwent an increase of 50 % in comparison to the rate of atmospheric dust deposited under normal conditions.El incendio forestal ocurrido en el verano de 1999 en la Sierra de la Almijara (Granada, de magnitud media pero severo, permitió determinar en condiciones de observación adecuadas las emisiones sólidas producidas por vía aérea fuera del sistema. Las partículas sólidas depositadas en su mayor parte durante los días del incendio son, fundamentalmente, cenizas y esférulas minerales rosáceas (EMR: el volumen de cenizas proyectadas al suelo del entorno se estima en 252 Tm (0,168 gr/m2; las EMR, microscópicas, originadas por el vapor de agua desprendido en el incendio, aglutinan las partículas minerales (PM suspendidas en el aire y aceleran su depósito. La tasa global obtenida para la semana del incendio experimentó un incremento del 50 % de la tasa de polvo atmosférico depositado en condiciones normales.

  17. Aportaciones de la mitología nórdica para comprender la modernidad: revisión de Max Weber

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    Maximiliano Emanuel Korstanje

    2012-06-01

    Full Text Available La antropología nos ha enseñado que se pueden alcanzar interesantes conclusiones cuando se llevan a cabo estudios en forma interdisciplinar y cuando se observa las diferencias de los “otros” desde una posición “de nativo”. Además, la diferencia de estos otros puede ser contrastada con las “nuestras” y de esa forma conocer las contradicciones y estructuraciones de la cultura en forma introspectiva. En concordancia con ello y luego del desarrollo expuesto, consideramos oportuno señalar que Max Weber ha omitido, en parte por razones que desconocemos el rol de la mitología germánica antigua en la configuración del Ethos Protestante. Misteriosamente o mejor dicho por la propia influencia familiar, el profesor de Friburgo giró su cabeza hacia el mundo de la piedad, la humildad y la predestinación insertas en la reforma. Si bien nuestro sociólogo no equivocó la identificación de los elementos que han conformado al capitalismo, evitó claramente formular mayores consideraciones sobre el papel de la mitología germánica de la antigüedad clásica en el pensamiento indo-europeo. En ese contexto, nuestro artículo pretende ser una contribución que sea desarrollada en futuros abordajes por otros autores.Palabras Claves: Weber; Capitalismo; Secularización; Modernidad; Mitología Germánica._________________________AbstractAnthropology has taught us that interesting conclusions can be reached when carrying out interdisciplinary studies. Also, when looking at the differences in the "other" from a position "native". Furthermore, unlike these others may be contrasted with "our". In this connection, it should be noted that Max Weber has omitted the role of the ancient germanic mythology in shaping the protestant ethos. By family influence, Professor of Freiburg turned his head toward the world of piety, and predestination own reform. Although no mistake in identifying the elements that have made capitalism, avoided making further

  18. Nuevas aportaciones a la gestión informatizada de derrames de hidrocarburos: su aplicación a “zonas refugio”

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    José Ramón Bergueiro

    2011-06-01

    Full Text Available The purpose of this paper is to describe most of the procedures to follow in deciding whether you should transfer a tanker wrecked in a "refuge zone". In reaching this decision, it should consider different procedures, in order to objectify the best decision. It is important to know very well the features and infrastructures of the different coastal areas, which can be considered as possible "refuge zones". Based on the foregoing analysis, it has developed a program consisting of several modules to permit compute data of great importance, among which include matrices of environmental and infrastructural values that allow for the calculation of certain factors for transfer actions and preparation of the tanker (transfer time of the tanker, berthing time and connection time to the pumping systems, time of emptying the oil in storage tanks, transfer to another tanker, etc. In addition, this program allows us to estimate the costs of cleaning and restoration, as well as losses in the tourism sector. Keywords: Hydrocarbons; Place of refuge; Oil spills El objeto del presente trabajo es el de describir la mayor parte de los procedimientos a seguir para decidir si es aconsejable trasladar un petrolero siniestrado a una “zona refugio”. Para tomar esta decisión se deberán considerar diferentes procedimientos, con la finalidad de objetivizar al máximo dicha decisión. Es de gran importancia conocer muy bien las características y las infraestructuras de las diferentes zonas costeras que pueden ser consideradas posibles “zonas refugio”. En base a todo lo anterior, se ha desarrollado un programa formado por varios módulos que permiten obtener datos de gran importancia, entre los que se incluyen las matrices de valores ambientales e infraestructurales, y que permite el cálculo de determinados factores determinantes para las actuaciones de traslado y preparación del petrolero (tiempo de traslado del petrolero, tiempo de atraque y conexión a los

  19. Algunas aportaciones teóricas a la influencia de la televisión en el proceso de socialización de la infancia.

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    Piedad María SAHUQUILLO MATEO

    2009-11-01

    Full Text Available RESUMEN: En el presente artículo tratamos de abordar y precisar, desde una perspectiva teórica de la educación, la complejidad del fenómeno televisivo y su influencia en el proceso de socialización de los más pequeños, por ser estos segmentos especialmente vulnerables e influenciables. Para ello, centramos nuestra atención en aquellos enfoques teóricos que, en mayor medida, han dedicado sus esfuerzos a la explicación de dicho fenómeno en relación al proceso de socialización: teoría del aprendizaje social, teoría de la aculturación, usos y gratificaciones. De este modo, podremos profundizar, en la línea ya apuntada, en el conocimiento de esta realidad de forma global, ya que no se trata de una actividad que pueda definirse desde compartimentos estancos.ABSTRACT: In this article we try to deal with and determine, from a theoretical perspective of education, the complexity of the television phenomenon and its influence on the process of socialization of children and adolescents, since these segments are specially vulnerable and easily influenced. To that end, we focused our attention on those theoretical approaches that, to a greater extent, have dedicated their efforts to the explanation of this phenomenon in relation to the socialization process: theory of social learning, cultivation theory, uses and gratifications. In this way, we will be able to go deeper into the knowledge of this reality as a whole in the line already indicated, since it is not an activity that can be defined from limited compartments.SOMMAIRE: Dans cet article on abordera et précisera la complexité du phénomène de la télévision et de son influence sur le processus de socialisation des enfants et des adolescents -étant donné que ce sont des segments de la population notamment vulnérables et influençables-, d'après une approche théorique de l'éducation. Avec cet objectif, notre intérêt sera porté sur les approches théoriques ayant expliqu

  20. Aussprache als motorische Fertigkeit

    DEFF Research Database (Denmark)

    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...

  1. Amyotrophic Lateral Sclerosis (ALS)

    Science.gov (United States)

    ... 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 ...

  2. Initial Symptoms of ALS

    Science.gov (United States)

    ... 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 ...

  3. The neural subject. Contributions to a pedagogy of possibility El sujeto neuronal: Aportaciones para una pedagogía de la posibilidad

    Directory of Open Access Journals (Sweden)

    Teresa N. R. Gonçalves

    2012-07-01

    framework of a pedagogy of possibility (Gonçalves, 2008, supported in a complexity theory approach. Normal.dotm 0 0 1 206 1179 Universidad de Salamanca 9 2 1447 12.0 0 false 18 pt 18 pt 0 0 false false false /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} Las investigaciones sobre el funcionamiento y desarrollo del cerebro están contribuyendo al surgimiento de una nueva comprensión de la cognición y del aprendizaje. La comprensión de los mecanismos neuronales que determinan la cognición y el aprendizaje –y que subyacen a la formación de la conciencia–, así como la relación entre cognición y emociones, y entre genética y entorno, tienen importantes implicaciones educativas (OECD, 2007, 2010; Gonçalves, 2009. Estos conocimientos conducen a nuevas perspectivas sobre el sujeto de la educación que nos permiten superar viejas dicotomías: razón/emociones, biología/cultura, cuerpo/mente, genética/entorno. El sujeto es «bio-psico-social», una construcción bio-antropológica: es bimodal (Asensio, García Carrasco, Núñez Cubero, Larrosa, 2006, García Carrasco, 2007 o multimodal (Smith, 2005, es Sapiens y Demens (Morin, 1999. Es lo que está entre (Nunes, 2002. En este artículo se analizan las implicaciones que las teorías emergentes de las neurociencias cognitivas tienen para la comprensión del sujeto de la educación. Dicho sujeto se caracteriza de acuerdo con

  4. Influencia del entorno económico y cultural en las aportaciones de los programas y documentos trasnacionales en favor de la integración laboral y social de las personas minusválidad

    Directory of Open Access Journals (Sweden)

    Ángel BARRUECO

    2009-11-01

    Full Text Available RESUMEN: En el presente estudio hacemos un seguimiento de las aportaciones del Programa de Acción Mundial para las personas con Discapacidad, aprobado por la Asamblea General de Naciones Unidas (1982, en relación con la integración laboral y social de la población minusválida. Especialmente nos hemos entretenido en el análisis de las influencias de este documento en el diseño y planificación de las actividades relacionadas con la formación profesional y el empleo en los países de nuestro entorno económico (Comunidad Europea. A la vez hemos tenido presente la perspectiva multicultural, ya que las personas minusválidas constituyen una minoría social trasnacional con sus propias singularidades. Constatamos también las dificultades que conlleva incorporar la "diversidad" a la educación intercultural.ABSTRACT: In this study we follow up the contributions of the World Action Program for the Handicapped passed by the United Nations General Assembly (1982, concerning the integration of the handicapped into the workforce and into society. We have taken a special interest in the analysis of the effects of this document on the designing and planning of activities related to vocational trainning and employment in the countries of our economic environment (European Community. At the same time we have kept in mind the multicultural perspective, since handicapped persons are a transnational social minority group with their own peculiarities. We also make note of the difficulties entailed in incorporating "diversity" into intercultural education.RÉSUMÉ: Dans cette étude nous faisons le suivi des contributions du Programme d'Action Mondiale pour les Personnes Handicapées, adopté par l'Assemblée Genérale des Nations Unies (1982, en ce qui concerne l'intégration au travail et l'intégration sociale de la population handicapée. Nous nous sommes spécialement intéressés a l'ánalyse des influences exercées par ce document dans l

  5. Volver al desarrollo

    Directory of Open Access Journals (Sweden)

    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.

  6. Jalta als Heterotopie

    OpenAIRE

    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.

  7. Pornographie als Metapher

    Directory of Open Access Journals (Sweden)

    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.

  8. Pornographie als Metapher

    OpenAIRE

    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...

  9. Sobre Al-Qarmuniyya

    OpenAIRE

    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.

  10. Aportaciones a la flora de Galicia, IX

    OpenAIRE

    Silva Pando, F.J.; Pino Pérez, R.; Pino Pérez, J.J.; García Martínez, X.R.; Morla Juaristi, C.; Cebolla Lozano, C.; Gómez Vigide, F.; Camaño Portela, J.L.; Rial Pousa, S.; Álvarez Graña, D.; Blanco Dios, J.B.; Paz Rosales, M.

    2009-01-01

    En este trabajo se mencionan 53 plantas de diverso interés para la flora de Galicia o zonas próximas. Se incluyen 3 novedades para España (Sesamoides minor (Lange) O. Kuntze x S. purpurascens (L.) G. López, Hedychium gardnerianum Sheppard ex Ker-Gawler y Oxalis incarnata L.) y otra para Portugal (Bromus hordeaceus L. subsp. ferronii (Mabille) P.M. Smith), 3 novedades regionales (Oxalis incarnata L., Antirrhinum latifolium Mill., Sisyrinchium striatum Mill.), 16 novedades provincia...

  11. Augusto Boal en la educación social: del teatro del oprimido al psicodrama silvestre

    Directory of Open Access Journals (Sweden)

    Manuel F. Vieites García

    2015-02-01

    Full Text Available La obra de Augusto Boal Teatro del Oprimido se suele situar entre las aportaciones más transcendentales del teatro del siglo XX, en tanto sus dictados teóricos y sus propuestas metodológicas y prácticas han calado en ámbitos de la educación social y teatral relacionados con el desarrollo de la democracia cultural. Pasados cuarenta años desde sus primeras experiencias, en este trabajo se propone una genealogía del teatro del oprimido a partir de una lectura crítica de sus textos fundacionales y de alguna experiencia considerada paradigmática en su desarrollo, para mostrar su naturaleza, aportes, fortalezas y debilidades. Igualmente se muestra el tránsito entre una dimensión más educativa y teatral y otra más centrada en la terapia y el desarrollo personal, para concluir que las técnicas y recursos empleados en teatro del oprimido, que proceden de fuentes muy diversas, siguen teniendo potencialidades indudables en propuestas de intervención social, cultural y educativa propias de la pedagogía teatral y la pedagogía social.Cómo referenciar este artículoVieites García, M. F. (2015. Augusto Boal en la educación social: del teatro del oprimido al psicodrama silvestre. Foro de Educación, 13(18, pp. 161-179. doi: http://dx.doi.org/10.14516/fde.2015.013.018.009 

  12. Al-Anon/Alateen

    Science.gov (United States)

    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? ...

  13. Al - BASED CAST COMPOSITES

    Directory of Open Access Journals (Sweden)

    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.

  14. [Environmental factors in ALS].

    Science.gov (United States)

    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

  15. EL INGLÉS PARA FINES ACADÉMICOS: APORTACIONES EN LA INVESTIGACIÓN Y ENSEÑANZA DEL DISCURSO CIENTÍFICO EL INGLÉS PARA FINES ACADÉMICOS: APORTACIONES EN LA INVESTIGACIÓN Y ENSEÑANZA DEL DISCURSO CIENTÍFICO

    Directory of Open Access Journals (Sweden)

    Pedro Martín Martín

    2010-10-01

    Full Text Available English for Academic Purposes (EAP is one of the fastest-expanding sub-branches of Applied Linguistics. In this fi eld of knowledge, research carried out in the areas of Genre Analysis and Contrastive Rhetoric has had particular relevance due to their valuable contribution to pedagogical material design. This paper surveys the evolution of EAP from its origins and its contribution to the analysis of scientifi c discourse. Within the Genre Analysis paradigm, this paper also explores the concepts of "discourse community" and "genre", and the importance that these concepts have today in academic discourse research. Moreover, this paper gives an account of the role of rhetoric studies, and particularly Contrastive Rhetoric, in the development of written compositions and the analyses of written discourse in academic contexts.El Inglés para Fines Académicos (IFA constituye en la actualidad una de las sub-áreas de mayor expansión de la Lingüística Aplicada. Dentro de este campo de estudio, las investigaciones realizadas en el ámbito del Análisis del Género y la Retórica Contrastiva han resultado particularmente relevantes por su valiosa aportación en la creación de material didáctico. En el presente ensayo se hace una revisión de la evolución que ha tenido el IFA desde sus inicios y su aportación al análisis del discurso científi co. Del mismo modo, dentro del paradigma del Análisis del Género, se examina el concepto de "comunidad discursiva" y el de "género", y la trascendencia que éstos han tenido en las investigaciones realizadas hasta el momento sobre el discurso académico en inglés, así como la importancia que han tenido los estudios de la retórica, y en particular la Retórica Contrastiva, en el desarrollo de la composición escrita y el análisis del discurso escrito en los diversos contextos académicos.

  16. Sociale media als leermiddel

    NARCIS (Netherlands)

    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.

  17. MDA ALS Caregiver's Guide

    Science.gov (United States)

    ... 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 ...

  18. Regionale Herkunft als Bonus

    OpenAIRE

    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.

  19. Factores asociados al bajo peso al nacer

    OpenAIRE

    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 ...

  20. Partizipation als Ausnahmezustand

    OpenAIRE

    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...

  1. Der Preis als Kaufbarriere?

    DEFF Research Database (Denmark)

    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...

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

    Institute of Scientific and Technical Information of China (English)

    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.

  3. Altern als Widerstand

    Directory of Open Access Journals (Sweden)

    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.

  4. Pornographie als Metapher

    Directory of Open Access Journals (Sweden)

    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.

  5. Wikipedia als Referenzorgan

    OpenAIRE

    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.

  6. BERKELEY: ALS ring

    International Nuclear Information System (INIS)

    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)

  7. Al Shanker Remembers.

    Science.gov (United States)

    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…

  8. "El inmortal": retorno al origen en un texto de Borges

    OpenAIRE

    Josefina García González

    2007-01-01

    ¿Es la vida una serie de repeticiones infinitas o de rupturas? Como respuesta, este artículo pretende disertar sobre el tratamiento estético que Jorge Luis Borges plantea en el cuento “El inmortal”. Se establece la existencia como un círculo donde las acciones innovadoras no son factibles, Borges propone la imposibilidad humana de trascender realmente, las aportaciones se consideran como inevitables, ‘alguien’ las haría de cualquier modo. Señales de un espíritu vanguardista propio de su liter...

  9. ALS insertion devices

    International Nuclear Information System (INIS)

    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

  10. De GPS al mapa

    Directory of Open Access Journals (Sweden)

    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.

  11. Acarbose als Carbophor

    OpenAIRE

    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 ...

  12. Augmented Reality als Bildungsenhancement?

    OpenAIRE

    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 ...

  13. Carta al editor

    OpenAIRE

    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.

  14. AL-USRCRN Station Information

    Data.gov (United States)

    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...

  15. Derivados vinculados al seguro.

    Directory of Open Access Journals (Sweden)

    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

  16. Gliricidia sepium al establecimiento

    Directory of Open Access Journals (Sweden)

    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

  17. Aportaciones de la ética de la alteridad de E. Lévinas y la ética del cuidado de C. Gilligan a la intervención en trabajo social

    OpenAIRE

    Idareta Goldaracena, Francisco; Úriz Pemán, María Jesús

    2012-01-01

    Al igual que en otras profesiones, la dimensión deontológica del Trabajo Social es la parte de la ética profesional que ha alcanzado un desarrollo mayor. La expresión más clara y conocida del deontologismo son los principios éticos, que constituyen el fundamento sobre el que se asientan las intervenciones profesionales. En nuestra opinión, la aplicación de principios éticos universales racionales es necesaria, pero no suficiente. Por ello, a lo largo de este artículo nos proponemos ampliar la...

  18. El sistema económico como ámbito de investigación escolar para la etapa Primaria : aportaciones desde el campo de la Didáctica de las Ciencias Sociales

    OpenAIRE

    Travé González, Gabriel

    1995-01-01

    En este artículo se presenta la propuesta inicial del Ambito de Investigación Escolar (AIF) denominado “El Sistema Económico"para la Etapa Primaria, que pretende ofrecer líneas de investigación a lo largo de la escolaridad y, potenciar así, procesos de construcción de conocimiento escolar deseable de las nociones económicas, con la finalidad de dar respuestas didácticas al tratamiento de los contenidos de índole económica, tan olvidados en el curriculum de las Ciencias Sociales -impartidos en...

  19. Epitaxial growth of Al/Al2O3 multilayer structures

    International Nuclear Information System (INIS)

    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)

  20. Doppelthydrophile Blockcopolymere als Mineralisationstemplate

    Science.gov (United States)

    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

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

    OpenAIRE

    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...

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

    Directory of Open Access Journals (Sweden)

    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.

  3. Editorial: Cartas al Editor

    Directory of Open Access Journals (Sweden)

    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

  4. Primeras aportaciones a la cronología cultural de la región del Tiris (Sahara Occidental desde el análisis de restos cerámicos

    Directory of Open Access Journals (Sweden)

    Telleria, E.

    2012-01-01

    Full Text Available Varios años de investigaciones sistemáticas en torno al pasado cultural de la región del Tiris, han permitido identificar y documentar un extenso legado material. Las líneas que siguen pretenden socializar parte de los resultados alcanzados en el estudio de uno de esos elementos patrimoniales, la cerámica. A estos efectos, se presentará la seriación cronológica proporcionada por el estudio cronométrico desarrollado mediante la técnica TL, así como el estudio tecnotipológico de los fragmentos analizados. Ambas consideraciones serán interpretadas de forma conjunta en un apartado final en el que se establecerán una serie de propuestas que necesariamente deberán ser cotejadas en el futuro.

  5. La enseñanza de la lengua española en I y II ciclos de la educación general básica. Aportaciones de la Universidad de Costa Rica

    Directory of Open Access Journals (Sweden)

    Murillo Rojas, Marielos

    2007-12-01

    Full Text Available Resumen: Este artículo expone los principales hallazgos de las investigaciones que, de 1990 al año 2007, se han desarrollado en la Universidad de Costa Rica, particularmente en la Facultad de Educación, sin obviar el aporte de otras instancias de la universidad, en relación con la enseñanza y el aprendizaje de la lengua española en la educación primaria costarricense.Abstract: This article exposes the main findings of the investigations that, of 1990 to year 2007, have been developed in the University of Costa Rica, particularly in the Faculty of Education, without avoiding the contribution of other instances of the university, in relation to the education and the learning of the Spanish language in the Costa Rican primary education.

  6. Estilos cognitivos en la dimensión científica y aportaciones a estilos de enseñanza en docentes universitarios de química

    Directory of Open Access Journals (Sweden)

    Casas Mateus, Jaime Augusto

    2016-05-01

    Full Text Available Los estilos cognitivos y los estilos de enseñanza han sido constructos objeto de investigación en las aulas universitarias. El presente ensayo pretende primeramente mostrar una muy condensada síntesis, tanto de las tradiciones, desarrollos, enfoques y tendencias, como de algunos estudios exploratorios, descriptivos o correlacionales relativos a los dos constructos, algunas veces implicando el estudio de variables intervinientes. En segunda medida, el estudio pretende ampliar el estado del arte, con una caracterización más integral y específica del profesorado universitario de química, en dos vías: una, teniendo en cuenta la dimensión científica, con base en investigaciones anteriores al año 82, para el estudio del estilo cognitivo y otra, teniendo en cuenta la necesidad de la inclusión del ámbito del laboratorio para el estudio integral del estilo de enseñanza en este particular colectivo. Finalmente el autor propone avanzar en el diseño y validación de instrumentos relativos a estos dos constructos y posteriormente estudiar las correlaciones entre el estilo de enseñanza, sea en el ámbito genérico (en la teoría o en el ámbito específico (en el laboratorio frente al respectivo estilo cognitivo en la dimensión científica en profesorado universitario de química.

  7. Orígenes del dorado por amalgama: aportaciones desde la orfebrería protohistórica del noroeste de la Península Ibérica

    Directory of Open Access Journals (Sweden)

    Martinón-Torres, Marcos

    2011-06-01

    Full Text Available The origins and transmission of mercury gilding remain unclear. Recently, the possibility of an independent focus of invention in the South of the Iberian Peninsula has been proposed (Perea et al. 2008. Here we present analyses by portable X-ray fluorescence (XRF of two torcs from the Northwest of the Iberian Peninsula that reveal the earliest evidence for this technique in the region. The technology and style of these artefacts raise the possibility of contacts and technological transmission on the Atlantic coast of Europe. Thus, these finds call for a diversification of the explanatory models for the difussion of this technique.

    Los orígenes y difusión de la técnica del dorado por amalgama de mercurio siguen planteando numerosos interrogantes. Recientemente se ha sugerido la posible existencia de un foco independiente para la invención de esta técnica en el sur de la Península Ibérica (Perea et al. 2008. En este artículo se presentan los análisis por fluorescencia de rayos X (FRX de dos fragmentos de torques protohistóricos del noroeste de la Península Ibérica dorados por amalgama, que constituyen la evidencia más temprana de dicha técnica en esta región. La tecnología y el estilo de estos objetos plantean la posibilidad de contactos y transmisión tecnológica a lo largo de la fachada atlántica europea. En consecuencia, estos hallazgos nos obligan a diversificar los modelos explicativos para la difusión de esta técnica.

  8. Alexandria (Al Iskandariya), Egypt

    Science.gov (United States)

    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.

  9. Undulators at the ALS

    International Nuclear Information System (INIS)

    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

  10. Atendiendo a las Variadas Problemáticas de los Cuidadores Familiares de Personas con Demencia: Aportaciones de la Terapia Cognitivo-Conductual y de la Terapia de Aceptación y Compromiso

    Directory of Open Access Journals (Sweden)

    Andrés Losada

    2015-01-01

    Full Text Available Cuidar a un familiar mayor con demencia se asocia con consecuencias emocionales negativas para los cuidadores. En este trabajo se describe una terapia cognitivo-conductual (TCC y otra de aceptación y compromiso (ACT que han sido diseñadas para reducir el malestar emocional de los cuidadores. El objetivo de la TTC es modificar creencias y pensamientos disfuncionales relacionados con el cuidado y entrenar a los cuidadores en el aumento de la frecuencia de actividades gratificantes. Incluye además entrenamiento en relajación y en habilidades para pedir ayuda. A través de la terapia ACT se trabaja la identificación del patrón personal de evitación experiencial y la alternativa de la aceptación de emociones, pensamientos y sensaciones, se ayuda al cuidador a identificar sus valores y las barreras para la acción coherente con ellos y se trabaja para incrementar la motivació del cuidador para comprometerse con sus valores y llevar a cabo acciones coherentes con dichos valores.

  11. Injertos sustitutos no óseos: Aportaciones del ácido poliláctico y poliglicólico Synthetic grafts materials: Polylactide and poliglycolide acid effects in bone regeneration

    Directory of Open Access Journals (Sweden)

    M. Marín Ruiz

    2009-04-01

    Full Text Available En el presente trabajo se realiza una revisión bibliográfica de los sustitutos no óseos disponibles en el mercado para mejorar y acelerar la regeneración ósea centrándonos en los polímeros de ácido poliláctico y poliglicólico por su relativa novedad para dicha aplicación. Los resultados obtenidos permiten confirmar la capacidad osteoconductora de dichos sustitutos en los procesos reparativos óseos pero a menudo también pueden actuar como barrera del proceso fisiológico de autorremodelación ósea al requerir un tiempo de reabsorción demasiado largo.The goal of the present study is to describe the nonbony sustitutes available to improve and to acelerate the bone regeneration pointing us polilactide and poliglycolide acid polymers by its relative newness for this application. The results confirm the osteoconductive capacity of this sustitutes in the bone regeneration even thought they can also be a barrier on the osseous autoremodelation of the physiological process as they need long time to be reabsorbed.

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

    Directory of Open Access Journals (Sweden)

    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

  13. Aportaciones de los maestros en formación a la construcción del perfil del docente competente desde la reflexión en el aula

    Directory of Open Access Journals (Sweden)

    Vicente Carrasco Embuena

    2012-11-01

    Full Text Available Este artículo recoge los resultados de un estudio realizado para conocer cuál es el perfil del docente competente, mediante la identificación y descripción de las cualidades que los estudiantes de Magisterio atribuyen a los buenos profesores. Se basa en la información aportada por un grupo de 73 alumnos/as de segundo curso de la Diplomatura de Magisterio de Educación Física, de la Universidad de Alicante, del curso académico 2009/10, que atendieron la propuesta de escribir sendas cartas a dos profesores que les hubiesen impartido docencia en cualquier etapa de su trayectoria académica: una dirigida al profesor/a que les impactó positivamente y otra a aquel del que no guardaran buen recuerdo. Por cuestión de espacio, se aportan los resultados de la investigación realizada con las primeras, que se ha abordado con una metodología cualitativa (análisis de contenido y utilizando el programa AQUAD 6 (Huber, 2006. Los resultados facilitan indicios para identificar el perfil del docente competente para formar a los ciudadanos en la sociedad de la información, en base a cinco dimensiones: cualidades personales, aptitud pedagógica, calidad de sus procesos de interacción, tipología de la formación que promueve y repercusión de su actuación sobre el alumnado. Estas características coinciden significativamente con las que se le atribuyen en la literatura científica y en los planes de estudio de los Grados de Maestro. 

  14. Indicadores de calidad de la producción en la Web of Science de diez profesores del área de personalidad, evaluación y tratamiento psicológico: aportaciones adicionales al estudio de Olivas-Ávila y Musi-Lechuga

    OpenAIRE

    Aluja Fabregat, Antón; Becoña Iglesias, Elisardo; Botella Arbona, Cristina; Colom Marañón, Roberto; Echeburúa Odriozola, Enrique; Forns, Maria; Pérez, Miguel; Vila, Jaime

    2011-01-01

    Los rankings de productividad científica resultan cada vez más relevantes, tanto a nivel individual como institucional. Garantizar que se basan en información confiable y exhaustiva es, por tanto, importante. Este estudio indica que la posición de los individuos en esa clase de ranking puede cambiar sustancialmente cuando se consideran diversos indicadores bibliométricos internacionalmente reconocidos. Se usa, como ilustración, el caso de los diez profesores del área de ‘Personalidad, Evaluac...

  15. Aportaciones al conocimiento de la evolución paleoclimática y paleoambiental en la Península Ibérica durante los dos ultimos millones de años a partir del estudio de trasvertinos y espeleotemas

    OpenAIRE

    Torres Pérez-Hidalgo, Trinidad José de; Barettino Fraile, Daniel; Canoira López, Laureano; Cobo, R.; García-cortés, Ángel; R. Grün; Hoyos, M.; Juliá, R.; Llamas Borrajo, Juan F.; Mansilla Izquierdo, Hermenegildo; Meyer, V.; Quintero, I.; Soler, V.; Valle, M.; Brusi, D.

    1996-01-01

    En este trabajo se contemplan los resultados principales del Proyecto" Reconstrucción Paleoclimática desde el Pleistoceno Medio a partir de análisis geocronológicos e isotópicos de travertinos españoles" (P. CEC FI2W-CT91-0075 " Paleoclimatological revision of climate evolution in the Western Mediterranean Region, Evaluation of altered scenarios) . Se seleccionaron cuatro áreas de depósitos travertínicos de carácter fluvial (Priego, Río Blanco), lacustre (Río Blanco, Banyoles) y aluvial (Tolo...

  16. Método de restitución fotográfica a partir de elementos circulares mediante uso de arcos tipo B-Splines cónicas, aplicado al "Diorama" de la exposición "La Nova Barcelona" (1934). Aportaciones para su futura museografía

    OpenAIRE

    Santana, Galdric; Àvila Casademont, Genís

    2013-01-01

    [ES] Aplicación de un nuevo método para la restitución fotográfica (de fotografía única) a partir de elementos circulares presentes en la proyección, mediante la adaptación interactiva de arcos de tipo b-spline cuadráticas (cónicas), con la finalidad de comprobar la curvatura de la pantalla cilíndrica que sirve de soporte para el diorama de la exposición "la nova Barcelona", que aparece en una fotografía del año 1934. El resultado de la restitución permite complementar los conocimientos sobre...

  17. Nuevas aportaciones metodológicas al estudio de los concheros cástreños del noroeste de la Península Ibérica: el castro de Punta dos Prados (Ortigueira, La Coruña, Galicia

    Directory of Open Access Journals (Sweden)

    José Manuel VÁZQUEZ VARELA

    2009-12-01

    Full Text Available RESUMEN: Se presenta el estudio de la fauna marina del conchero del castro costero de Punta dos Prados (Ortigueira, La Coruña, situado en el noroeste de la Península Ibérica. La aplicación de nuevos índices, permite una comparación más rigurosa entre los diferentes yacimientos de este momento, así como profundizar en las formas de explotación de los mariscos. La mayor parte de las especies analizadas proceden de la zona intermareal, representando desigualmente diferentes comunidades.ABSTRACT: We would like to present our recent studies related to the marine fauna of shell midden which is situated on a coastal hillfort of Punta dos Prados (Ortigueira, La Coruña in the north-west of the Iberian Peninsula. We ha ve used new indexes that providing a better comparison between the different sites of those times and also making possible to offer a deeper study about shellfish exploitation means. An high proportion of species studied in this analysis come from the intertidal zone and represent unequaly different communities.

  18. El miedo al rey

    Directory of Open Access Journals (Sweden)

    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

  19. El pensamiento frente al arte

    OpenAIRE

    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.

  20. La contribución del Nuevo Mundo al nacimiento de las ciencias paleontológicas = The contribution of the New World to the birth of the paleontological Sciences

    Directory of Open Access Journals (Sweden)

    León Garrido, Miguel

    2016-05-01

    Full Text Available Resumen: Este trabajo presenta una aproximación a la contribución del Nuevo Mundo al nacimiento y consolidación de las ciencias paleontológicas, haciendo especial énfasis en la relación científica entre España y las colonias americanas. Los hallazgos de fósiles americanos influyeron poderosamente en los cambios de paradigma que tuvieron lugar en las ciencias naturales entre la Edad Moderna y los inicios de la Edad Contemporánea. Los estudiosos americanos no se limitaron al descubrimiento y envío de muestras a las instituciones europeas para su estudio, sino que formularon sus propias teorías interpretativas y llevaron a cabo aportaciones novedosas y pioneras en el campo de la geología americana. El diálogo científico entre la España y sus colonias se vio interrumpido tras las Guerras de Emancipación = Abstract: This paper presents an approach to the contribution of the New World to the birth and consolidation of paleontological sciences, with special emphasis on the scientific relationship between Spain and its American colonies. American fossil findings powerfully influenced the paradigm changes that took place in the natural sciences among the Modern Age and the beginnings of the Contemporary Age. American Scientifics were not only dedicated to the discovery and sending of samples to the European institutions for their study, but also made their own interpretative theories and carried out innovative and pioneering contributions in the knowledge about the Geology of America.The scientific dialogue between Spain and its colonies was interrupted after the Wars of Emancipation.

  1. Consoer et al PFOS dataset

    Data.gov (United States)

    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...

  2. DESAFÍOS AL ORDEN

    Directory of Open Access Journals (Sweden)

    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.

  3. Seltzer_et_al_2016

    Data.gov (United States)

    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...

  4. Note intorno al Teatro Vagante

    OpenAIRE

    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 ...

  5. Information als Gegenstand von Informationskompetenz

    OpenAIRE

    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...

  6. Response to Brosch et al.

    OpenAIRE

    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.

  7. La ciudad de Valencia como espacio percibido por los estudiantes universitarios. Aportaciones desde el análisis propuesto por la geografía de la percepción

    Directory of Open Access Journals (Sweden)

    Morales Yago, Francisco José

    2015-06-01

    Full Text Available The analysis and use of the interior space of the city, is conditioned not only by economic and social factors, also by images or mental representations that people make the places we live or know through sources of information world. Mental images are determined by the ways we use to get around, the places we frequent and feelings of rejection or identification with space everyday object. To achieve that perceived knowledge survey results and developing mental maps conducted among college students living in Valencia will be presented. From them will advance knowledge, it performed by the different actors involved in space planning improvement proposals that contribute to the harmonious and sustainable growth, palpable correcting deficiencies that may affect the quality of life of citizens.El análisis y utilización del espacio interior de la ciudad está condicionado no sólo por factores económicos y sociales, también por las imágenes o representaciones mentales que las personas se hacen de los lugares en los que viven o conocen a través de las fuentes de información que existen. Las imágenes mentales están determinadas por los caminos que utilizamos para desplazarnos, los lugares que frecuentamos y los sentimientos de identificación o rechazo con el espacio objeto de uso cotidiano. Para alcanzar ese conocimiento percibido se presentarán los resultados de encuestas y elaboración de mapas mentales llevados a cabo entre alumnos universitarios residentes en Valencia. A partir de ellos se avanzará en el conocimiento, realizándose, por parte de los distintos agentes que intervienen en la planificación del espacio, propuestas de mejora que contribuyan al crecimiento armónico y sostenible, corrigiendo deficiencias palpables que puedan alterar la calidad de vida de los ciudadanos. [fr] L’analyse et l’utilisation de l’espace intérieur de la ville, est conditionnée non seulement par des facteurs économiques et sociaux, aussi par

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

    OpenAIRE

    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...

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

    OpenAIRE

    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}.

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

    OpenAIRE

    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...

  11. Al clamor de les vuvuzeles

    Directory of Open Access Journals (Sweden)

    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.

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

    International Nuclear Information System (INIS)

    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

  13. Modeling of the ALS linac

    International Nuclear Information System (INIS)

    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

  14. Conjuntivitis alérgica

    Directory of Open Access Journals (Sweden)

    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.

  15. ALS:A SAIRASTAVAN TOIMINTATERAPIA

    OpenAIRE

    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...

  16. Contribución al estudio de polifenoles y aceites esenciales en el género "Thymus" L.

    OpenAIRE

    Vila Casanovas, Roser

    1987-01-01

    En el presente trabajo de investigación se determina por primera vez la composición flavónica de "Thymus willkomii", "T. aestivus" y "T. glandulosus", y se efectúan nuevas aportaciones sobre los polifenoles de "T. membranaceus", "T. longiflorus", "T. moroderi", "T. funkii", "T. capitellatus", "T. camphoratus", "T. vulgaris", "T. baeticus" y "T. orospedanus".Se aislan 27 flavonoides de las hojas de "T. moroderi". Veintiuno son aglicones que se distribuyen en catorce flavones: 5-desmetilnobilet...

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

    International Nuclear Information System (INIS)

    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

  18. Dynamic Modeling of ALS Systems

    Science.gov (United States)

    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.

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

    International Nuclear Information System (INIS)

    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

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

    OpenAIRE

    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...

  1. Personalidad y tolerancia al dolor

    Directory of Open Access Journals (Sweden)

    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.

  2. 75 FR 62858 - United States, et al.

    Science.gov (United States)

    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...

  3. 76 FR 38700 - United States, et al.

    Science.gov (United States)

    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....

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

    International Nuclear Information System (INIS)

    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

  5. Electrowinning Al from Al2S3 in Molten Salt

    OpenAIRE

    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...

  6. Thermal conductance of a pressed Al-Al contact

    Science.gov (United States)

    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.

  7. Aportaciones y Aplicaciones de Disciplinas Bioinspiradas a la Creatividad Computacional

    OpenAIRE

    Sánchez Quintana, Carlos Alberto

    2015-01-01

    ¿Puede una computadora presentar comportamientos creativos? Esta compleja cuestión ha despertado un creciente interés en las últimas décadas. Es un hecho evidente que las computadoras han superado la capacidad humana en múltiples dominios. Sin embargo, alcanzar la creatividad humana sigue suponiendo un reto para las computadoras, siendo considerada como un factor clave en el éxito intelectual de los humanos que los diferencia del resto de seres. Esto permite plantear la cuestión acerca de si...

  8. Baldomero Cateura, biografía y aportaciones musicales

    OpenAIRE

    Perandones Lozano, Miriam

    2007-01-01

    En este estudio se ofrece una panorámica inédita de la música española de la segunda mitad del siglo XIX, que gira en torno a la polifacética personalidad de Baldomero Cateura (1856-1929), tenaz hombre de negocios, que sublimaba esta faceta con su dedicación a la música en la Barcelona de la Exposición de 1888, abierta a Europa. Inventor de la mandolina española, para la cual ideó nuevos recursos, y del pedalier para piano, que interesó a muchos pianistas del momento, especialmente a Granados...

  9. Recientes aportaciones a las religiones primitivas de la Hispania Antigua

    OpenAIRE

    Blázquez, José M.; García-Gelabert, M. Paz

    1991-01-01

    We present and discuss a certain number of theonimes Vortiacio, Larrahi, Errensa, Lacubegi, Porconis, Peremusla, Selalse, Bandua, Cossus, Nabia, Reva, Neito, Vaelico, Ninimedius, Seddiaqus, Erudinw

  10. Contribuciones al estudio de la motivación laboral: enfoques teóricos desde la dimensión de autoexpresión del ser humano

    Directory of Open Access Journals (Sweden)

    SONIA AGUT NIETO

    2007-01-01

    Full Text Available El objetivo de este trabajo es integrar las principales aportaciones al estudio de la motivación humana, prestando especial atención a las más aplicadas para la explicación del comportamiento relacionado con el trabajo, pero desde un criterio clasificador distinto de los utilizados hasta ahora: la condición de autoexpresión del individuo como fuerza fundamental que activa, dirige y mantiene el comportamiento de las personas. Esto nos lleva a agrupar las teorías en tres categorías, en función de la forma concreta de autoexpresión del individuo que subyace en cada enfoque teórico: 1 enfoques teóricos que enfatizan el carácter hedonista de la actividad laboral, desde donde se considera que la persona se expresa a través del placer derivado de los resultados que obtiene en el trabajo; 2 enfoques teóricos que enfatizan la capacidad de autorregulación del individuo en el trabajo, para así conseguir resultados que le permitan poner de manifiesto su competencia y su dominio, y por último, 3 enfoques teóricos que enfatizan la autoexpresión genuina de la persona más allá de la actividad laboral, siendo ella misma, entendiendo el trabajo como lo que es, sin que le bloquee la expresión de su propia identidad.

  11. Aproximación biológica al estudio de la emoción

    OpenAIRE

    Palmero, Francisco

    1996-01-01

    El presente trabajo intenta ofrecer una panorámica diacrónica de los estudios sobre Psicología de la Emoción, centrando el tema en la relevancia de las formulaciones biológicas. Se analizan algunas de las aportaciones que, desde un punto de vista biológico, más parecen haber influido en la teoría psicológica de la Emoción. Así, desde los clásicos planteamientos de principio de siglo de James y Cannon, claramente influenciados por las ideas evolucionistas, hasta...

  12. Aportació al control del convertidor CC/CA de tres nivells.

    OpenAIRE

    Alepuz Menéndez, Salvador Simón

    2004-01-01

    La presente tesis estudia, propone y realiza sus principales aportaciones en el campo del control para el convertidor CC/CA de tres niveles, sobre la topología denominada Neutral-Point-Clamped, aunque se puede extender a otras topologías y/o número de niveles. Se presenta una metodología de modelado que emplea funciones de conmutación de fase, el operador de promediado y la transformación D-Q, tal que los modelos obtenidos en el dominio D-Q contienen una información completa sobre la dinámica...

  13. Type idéal

    OpenAIRE

    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...

  14. Al-Hadith Text Classifier

    Directory of Open Access Journals (Sweden)

    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.

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

    Science.gov (United States)

    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.

  16. Lernhabitus als Grundlage lebenslanger Lernprozesse

    OpenAIRE

    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...

  17. Utilitarismus als Methode der Ethik

    OpenAIRE

    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...

  18. Vormundschaftsrecht als Grundlage politischer Herrschaft

    Directory of Open Access Journals (Sweden)

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Directory of Open Access Journals (Sweden)

    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. 

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  2. De los derechos humanos al derecho al aborto

    OpenAIRE

    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 ...

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

    OpenAIRE

    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 ...

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

    Directory of Open Access Journals (Sweden)

    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.

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

    OpenAIRE

    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...

  6. El estado del arte de la tecnología al servicio de la construcción

    Directory of Open Access Journals (Sweden)

    Lopez Peñalver, Francisco Javier

    2004-12-01

    evolutiva de acuerdo a las tecnologías que conocemos en la actualidad, atendiendo a las ofertas y demandas del mercado.La integración, aplicación y puesta en marcha de la combinación de tecnologías en la arquitectura del hogar, se conoce en la actualidad como Domótica, aunque ni siquiera el término que se maneja parece complacer en cierta medida a los vinculados al sector. Cierto es que en lo que se está de acuerdo es en que el objetivo de toda esta evolución es conseguir aplicaciones y servicios de utilidad para todos los habitantes del hogar o de una comunidad.En este artículo se presenta una visión global sobre todo lo que rodea al nuevo concepto de “Entorno Inteligente”, distinguiendo sus orígenes, aportaciones, el entorno social que lo envuelve, así como la mención a las distintas tecnologías y servicios existentes, siempre destacando el crecimiento progresivo del concepto.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Science.gov (United States)

    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.

  9. Reply to Pachai et al.

    Science.gov (United States)

    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

  10. Al-Hadith Text Classifier

    OpenAIRE

    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...

  11. The ALS Gun Electronics system

    International Nuclear Information System (INIS)

    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

  12. The ALS project: lessons learned

    Science.gov (United States)

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    OpenAIRE

    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...

  15. Formaline of alternatieven als ontsmettingsmiddel voor broedeieren

    OpenAIRE

    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.

  16. Benefits for Military Veterans with ALS

    Science.gov (United States)

    ... 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 ...

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Directory of Open Access Journals (Sweden)

    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

  19. Thermoluminescence properties of AlN ceramics

    DEFF Research Database (Denmark)

    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...

  20. Electroplating Zn-Al Alloy Technology

    Institute of Scientific and Technical Information of China (English)

    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%.

  1. The fabrication of 26Al targets

    International Nuclear Information System (INIS)

    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.)

  2. Nonstoichiometry of Al-Zr intermetallic phases

    Energy Technology Data Exchange (ETDEWEB)

    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.

  3. Topiramat als Phasenprophylaktikum - ein Fallbericht

    Directory of Open Access Journals (Sweden)

    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.

  4. Systems Engineering Techniques for ALS Decision Making

    Science.gov (United States)

    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.

  5. Polythermal cutting of Al-Si-YAl2 system

    International Nuclear Information System (INIS)

    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

  6. Progresses in analyzing 26Al with SMCAMS

    International Nuclear Information System (INIS)

    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)

  7. AlON粉体的合成

    Institute of Scientific and Technical Information of China (English)

    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。

  8. Trato verbal paterno al adolescente

    Directory of Open Access Journals (Sweden)

    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.

     

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

    International Nuclear Information System (INIS)

    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.)

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

    International Nuclear Information System (INIS)

    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

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Science.gov (United States)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.)

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

    Directory of Open Access Journals (Sweden)

    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.

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

    OpenAIRE

    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...

  16. Orientation relationship of eutectoid FeAl and FeAl2

    Science.gov (United States)

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

    2016-01-01

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

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

    International Nuclear Information System (INIS)

    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)

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

    International Nuclear Information System (INIS)

    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.

  19. High pressure studies of UFe5Al7 and UFe7Al5 actinide compounds

    International Nuclear Information System (INIS)

    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)

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

    Science.gov (United States)

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

    2015-10-01

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

  1. Fabrication of /sup 26/Al targets

    Energy Technology Data Exchange (ETDEWEB)

    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.

  2. The wobbler mouse, an ALS animal model

    OpenAIRE

    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,...

  3. A New Phase in ALS Research.

    Science.gov (United States)

    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

  4. Growth of CdTe: Al films

    International Nuclear Information System (INIS)

    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)

  5. Genetics of Familial and Sporadic ALS

    Science.gov (United States)

    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

  6. 关于w-al-CL空间%On w-al-CL Spaces

    Institute of Scientific and Technical Information of China (English)

    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.

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

    International Nuclear Information System (INIS)

    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

  8. Untersuchung der Nitridierung V/Al-intermetallischer Phasen

    OpenAIRE

    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 ...

  9. Response to Signorovitch et al.

    Science.gov (United States)

    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

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

    Science.gov (United States)

    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

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

    International Nuclear Information System (INIS)

    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)

  12. Teoría de la incertidumbre aplicada al valor del cliente en situaciones contractuales con intervalos de confianza = The Uncertainty Theory assignment in the Customer Lifetime Valuation (CLV for contractual settings with security intervals

    Directory of Open Access Journals (Sweden)

    Merigó, José M.

    2007-01-01

    Full Text Available El valor del consumidor ha sido un concepto muy estudiado desde hace tiempo por investigadores en las áreas de marketing. La mayoría de estas investigaciones están basadas en supuestos deterministas o aleatorios, al medir magnitudes o eventos que intervienen en el cálculo del valor del cliente. En muchas ocasiones, los modelos del valor del consumidor en los que se involucran magnitudes que hacen referencia al futuro, por el entorno regido por su mutabilidad y por la incertidumbre, resultan excesivamente precisos para poder reflejar la realidad. Kaufmann y Gil Aluja (1986, que son dos de los precursores e investigadores más notables en Europa en las técnicas operativas de gestión, sostenían que “lo impreciso, lo borroso, no tiene por qué ser inexacto”. Podemos trabajar con modelos en los que tradicionalmente se utilizan cifras precisas pero no son necesariamente exactos. En la investigación que nos ocupa, proponemos las aportaciones necesarias para utilizar cifras inciertas, borrosas, pero más adecuadas a la realidad. Vamos a presentar, para ello, dos modelos del valor del cliente (CLV con la herramienta menos estructurada de la teoría de la incertidumbre: los intervalos de confianza, con la finalidad de ayudar a trabajar magnitudes inciertas involucradas en el cálculo del CLV. = The Customer Lifetime Value (CLV concept has been highly purposed in many researches in the marketing area since long time ago. Almost all of them tend to be based on determinist or stochastic assumptions when measuring magnitudes or events which have to do with CLV estimates. Often, the Customer Lifetime Valuation (CLV involves magnitudes that link to the future by the running environment, its mutability and uncertainty, and this turn out the results to be too accurate. Kaufman and Gil Aluja (1986, who are the two most well known European investigators, have carried out researches into several operative management techniques, stood by the following

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

    OpenAIRE

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    International Nuclear Information System (INIS)

    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

  16. Diana Al-Hadid: Identity and Heritage

    Science.gov (United States)

    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…

  17. Kus on al-Zarqawi? / Aadu Hiietamm

    Index Scriptorium Estoniae

    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

  18. Als je vrienden hebt dan win je

    NARCIS (Netherlands)

    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

  19. Contribución al estudio de la lógica y de los condicionales borrosos

    OpenAIRE

    Cubillo Villanueva, Susana

    1993-01-01

    La tesis constituye una nueva visión y un conjunto de nuevas aportaciones sobre algunos conceptos básicos de la lógica difusa. El primer capítulo se dedica a los conectivos, particularmente a la conjunción, las t-normas han sido las funciones comúnmente utilizadas a fin de representar el "y" en lógica difusa; en este trabajo se propone un modelo de conjunción que incluye la media geométrica, y parcialmente, las medias ponderadas. El capítulo II recoge algunos resultados sobre condicionales, y...

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

    OpenAIRE

    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...

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

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

    Science.gov (United States)

    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.

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

    OpenAIRE

    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.

  4. Reflexiones y demandas de estudiantes egresados de la Universidad de Granada sobre la formación práctica. Aportaciones para la construcción del Espacio Europeo de Educación Superior. Reflexiones y Demandas de Egresados de la Universidad de Granada sobre la Formación Práctica: Aportes para la Mejora del Espacio Europeo de Educación Superior

    Directory of Open Access Journals (Sweden)

    Mª Carmen López López

    2010-12-01

    Full Text Available

    Resumen:

    El llamado Proceso de Convergencia en la Educación Superior a nivel europeo está desencadenando una reconversión a nivel estructural, curricular y profesional de gran relevancia. Entre las demandas más reiteradas figuran las que solicitan una revitalización de la vertiente práctica de la formación. Este trabajo recoge las aportaciones, mediante grupo de discusión integrado por estudiantes egresados de la Licenciatura de Pedagogía, en torno a diez aspectos claves derivados del estudio comparado de los programas de Prácticum de distintas universidades españolas.

     

    Reflections and demands of postgraduate students of Granada University about the Teaching Practice Period. Contributions for the construction of the European Space for Higher Education

     

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

    International Nuclear Information System (INIS)

    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)

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

    OpenAIRE

    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 ...

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

    Science.gov (United States)

    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

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

    OpenAIRE

    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-...

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

    International Nuclear Information System (INIS)

    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

  10. Magnetism in bcc Fe-Al alloy

    Energy Technology Data Exchange (ETDEWEB)

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

    1994-11-01

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

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

    Science.gov (United States)

    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.

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

    Directory of Open Access Journals (Sweden)

    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.' ' '

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

    Science.gov (United States)

    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.

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

    Science.gov (United States)

    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.

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

    Science.gov (United States)

    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

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

    International Nuclear Information System (INIS)

    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

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

    Institute of Scientific and Technical Information of China (English)

    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.

  18. La imagen mediante resonancia magnética en el diagnóstico de algunas lesiones de la extremidad equina. Diferentes aportaciones de las potenciaciones básicas al estudio y diagnóstico de cada lesión - Magnetic resonance imaging in some equine limb injuries diagnosis. Different contributions of basic weighted sequences in the study and diagnosis of each injury.

    Directory of Open Access Journals (Sweden)

    Fernández-Romojaro, José

    2010-01-01

    Full Text Available ResumenLa Imagen por Resonancia magnética (IRM, frecuentemente, es el último paso de un laborioso y costoso proceso de diagnóstico; sus complicaciones y coste, en la actualidad, hacen que cuando se recomienda a un propietario someter a su caballo a este procedimiento, sea con una razón justificada y un alto gradode confianza en la obtención de un diagnóstico fiable y preciso a través de ella.SummaryUsually magnetic resonance imaging (IRM is the last step in a complicated and expensive diagnostic procedure. Now days, Its complications and price make necessary that if the MRI is recommended to the owner for his horse, It should be with a justified reason and high level of trust about getting a true and accurate diagnosis.

  19. Adherencia al tratamiento en la esquizofrenia

    OpenAIRE

    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...

  20. Amyotrofinen lateraaliskleroosi (ALS) ja potilaan ohjaus

    OpenAIRE

    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...

  1. Suspected variables among Al Sufi stars.

    Science.gov (United States)

    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.

  2. TAFSIR SEMANTIK TERHADAP SURAT AL-KAFIRUN

    Directory of Open Access Journals (Sweden)

    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.

  3. Linija za transport Al-polizdelkov

    OpenAIRE

    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...

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

    Science.gov (United States)

    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.

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

    International Nuclear Information System (INIS)

    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.

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

    Directory of Open Access Journals (Sweden)

    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.

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

    Directory of Open Access Journals (Sweden)

    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

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

    Directory of Open Access Journals (Sweden)

    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.

  9. Pesticides Linked to Raised Risk of ALS

    Science.gov (United States)

    ... 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 ...

  10. Pesticides Linked to Raised Risk of ALS

    Science.gov (United States)

    ... 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 ...

  11. Stem Cells Deemed Safe for ALS Patients

    Science.gov (United States)

    ... 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 ...

  12. ALS: Recent Developments from Genetics Studies.

    Science.gov (United States)

    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

  13. Het Nederlandse bos als vorm van bodemgebruik

    NARCIS (Netherlands)

    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

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

    International Nuclear Information System (INIS)

    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

  15. Hans Freudenthal als docent en collega

    OpenAIRE

    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.

  16. Effects of Al substitution on goethite formation

    OpenAIRE

    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...

  17. Anerkennung als Voraussetzung gesellschaftlicher und unternehmerischer Teilhabe

    OpenAIRE

    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...

  18. Information als Gegenstand von Informationskompetenz. Eine Begriffsanalyse

    OpenAIRE

    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...

  19. Plasma nitriding of Al 99.5

    OpenAIRE

    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...

  20. Communication Support for People with ALS

    OpenAIRE

    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...

  1. Performance of the ALS injection system

    International Nuclear Information System (INIS)

    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

  2. Del latín al rumano

    Directory of Open Access Journals (Sweden)

    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.

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

    Science.gov (United States)

    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

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

    KAUST Repository

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Directory of Open Access Journals (Sweden)

    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.

  7. Clinical trials for neuroprotection in ALS.

    Science.gov (United States)

    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

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

    International Nuclear Information System (INIS)

    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

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

    Directory of Open Access Journals (Sweden)

    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

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

    International Nuclear Information System (INIS)

    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

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

    International Nuclear Information System (INIS)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

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

    International Nuclear Information System (INIS)

    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

  14. 60Co gamma radiation effect on AlGaN//AlN/GaN HEMT devices

    International Nuclear Information System (INIS)

    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)

  15. 60Co gamma radiation effect on AlGaN/AlN/GaN HEMT devices

    Institute of Scientific and Technical Information of China (English)

    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.

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

    International Nuclear Information System (INIS)

    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

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

    Science.gov (United States)

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

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

    OpenAIRE

    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...

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Science.gov (United States)

    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)

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

    International Nuclear Information System (INIS)

    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.)

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

    Science.gov (United States)

    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.

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

    OpenAIRE

    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...

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

    International Nuclear Information System (INIS)

    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

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

    Science.gov (United States)

    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.

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

    Science.gov (United States)

    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.

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

    Directory of Open Access Journals (Sweden)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

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

    International Nuclear Information System (INIS)

    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

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

    Science.gov (United States)

    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

  15. Sintering Behavior of CNT Reinforced Al6061 and Al2124 Nanocomposites

    OpenAIRE

    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, ...

  16. Microstructure and mechanical properties of Al2O3/TiAl composite

    Institute of Scientific and Technical Information of China (English)

    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.

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

    OpenAIRE

    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...

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

    Science.gov (United States)

    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.

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

    OpenAIRE

    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...

  20. La transición de la manzana cerrada al bloque abierto en la ciudad de Madrid durante la primera mitad del siglo XX

    Directory of Open Access Journals (Sweden)

    Miguel Angel Cristobal Araujo

    2014-06-01

    Full Text Available ResumenLa motivación que impulsa la investigación es profundizar en el cambio de paradigma que se produce en la construcción de la vivienda colectiva en Madrid durante la primera mitad del siglo XX. El trabajo estudia aquellas obras de vivienda residencial colectiva, que en su diseño, muestran una evolución de la manzana cerrada decimonónica al bloque abierto, como referencia de los postulados del Movimiento Moderno. La metodología empleada limita las obras de estudio según su localización geográfica, año de construcción y tipología constructiva. El estudio y los datos del trabajo se obtienen del levantamiento digital realizado por la Comunidad de Madrid en 2004 y la visita in situ a las obras, durante el periodo de realización del trabajo (enero/junio 2013. Más allá de las aportaciones numéricas del estudio, las conclusiones aportan la división en tres fases de esta transición; la primera en la que el solar es producto de la subdivisión de una manzana cerrada. En la segunda fase, el edificio ocupa la totalidad de la manzana, pero los espacios públicos no son accesibles al peatón. Y en tercer lugar, el solar pierde la condición geométrica cuadrangular de la manzana cerrada y los espacios públicos son libremente accesibles.Palabras claveMovimiento Moderno, vivienda residencial colectiva.AbstractThe motivation behind the research is to deepen the paradigm shift that occurs in the construction of collective housing in Madrid during the first half of the twentieth century. The paper examines those works of collective residential housing , which in its design, show an evolution of the city block to open block, by reference to the principles of the Modern Movement. The methodology used to study the works, was limited by geographic location, year of construction and type of construction. The study and work data obtained from digital survey conducted by the Community of Madrid in 2004 and the site visit to the works, during the

  1. Melting Transition of Small Aluminium Clusters Al11-20

    Institute of Scientific and Technical Information of China (English)

    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.

  2. Kerja Perspektif Al-Qur'an

    Directory of Open Access Journals (Sweden)

    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 .

  3. 26Al in the interstellar medium

    International Nuclear Information System (INIS)

    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.)

  4. Cd ion implantation in AlN

    International Nuclear Information System (INIS)

    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.

  5. Survey and alignment at the ALS

    International Nuclear Information System (INIS)

    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

  6. Direct laser cooling Al+ ions optical clocks

    CERN Document Server

    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 ...

  7. Epistemologi Penafsiran Ilmiah al-Qur’an

    Directory of Open Access Journals (Sweden)

    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.

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

    Directory of Open Access Journals (Sweden)

    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

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

    Institute of Scientific and Technical Information of China (English)

    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.

  10. 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

    International Nuclear Information System (INIS)

    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

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

    Indian Academy of Sciences (India)

    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).

  12. Al- Khwarizmi and axiomatic foundation of algebra

    International Nuclear Information System (INIS)

    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)

  13. Moessbauer studies on Al-Co ferrites

    International Nuclear Information System (INIS)

    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.)

  14. Magnetic Properties of NdAl2

    DEFF Research Database (Denmark)

    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...

  15. Autologous Stem Cell Transplant for AL Amyloidosis

    Directory of Open Access Journals (Sweden)

    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.

  16. Thermal Properties of Al-50%Si Alloys

    Institute of Scientific and Technical Information of China (English)

    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.

  17. Kritik Terhadap Pemikiran Tasawuf Al-Raniri

    Directory of Open Access Journals (Sweden)

    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

  18. APORTACIONES DIDÁCTICAS EN LOS LIBROS DE TEXTO Y SU RELACIÓN CON LA ANSIEDAD ANTE EL APRENDIZAJE DE UNA LENGUA EXTRANJERA : Una exploración cualitativa de tres libros de texto de español como lengua extranjera paso 1 de educación secundaria

    OpenAIRE

    Carlos Valladares Segovia, Juan

    2016-01-01

    El objetivo de este trabajo es identificar qué competencias generales y qué competencias comunicativas, según el enfoque comunicativo, se promueven en tres libros de texto de español como lengua extranjera y determinar su relación con la variable afectiva de la ansiedad. Para alcanzar los planteamientos de nuestra investigación utilizamos una aproximación cualitativa, empleando el cuestionario de análisis NAKIBAR 2004 perteneciente al trabajo de investigación realizado por Joseba Ezeiza Ramos...

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

    Directory of Open Access Journals (Sweden)

    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.

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

    Indian Academy of Sciences (India)

    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.

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

    Directory of Open Access Journals (Sweden)

    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

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

    Science.gov (United States)

    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.

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

    Science.gov (United States)

    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.

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

    International Nuclear Information System (INIS)

    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

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

    DEFF Research Database (Denmark)

    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...

  6. Introducción al derecho

    OpenAIRE

    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...

  7. Quadrupole scattering in PrAl2

    Science.gov (United States)

    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.

  8. Amyotrofisen lateraaliskleroosin (ALS) fysioterapia : Systemaattinen kirjallisuuskatsaus

    OpenAIRE

    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 ...

  9. Aspectos biopsicosociales asociados al embarazo adolescente

    OpenAIRE

    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...

  10. Recent research highlights from the ALS OML

    OpenAIRE

    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...

  11. The wobbler mouse, an ALS animal model

    DEFF Research Database (Denmark)

    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...

  12. The ALS Storage Ring RF System

    International Nuclear Information System (INIS)

    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

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

    OpenAIRE

    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...

  14. Metamagnetism in Ce(Ga,Al)2

    Indian Academy of Sciences (India)

    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.

  15. Periodistas: el acceso al mercado laboral

    OpenAIRE

    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...

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

    Science.gov (United States)

    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

  17. Microstructural defects modeling in the Al-Mo system

    International Nuclear Information System (INIS)

    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)

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

    Directory of Open Access Journals (Sweden)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  20. FABRICATION OF Al/Al2O3 FGM ROTATING DISC

    Directory of Open Access Journals (Sweden)

    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.

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

    Science.gov (United States)

    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.

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

    CERN Document Server

    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.

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

    International Nuclear Information System (INIS)

    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

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

    International Nuclear Information System (INIS)

    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

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

    DEFF Research Database (Denmark)

    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....

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

    Science.gov (United States)

    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.

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

    International Nuclear Information System (INIS)

    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.)

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    International Nuclear Information System (INIS)

    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

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

    Science.gov (United States)

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    Science.gov (United States)

    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.

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

    International Nuclear Information System (INIS)

    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

  14. Management of respiratory symptoms in ALS.

    LENUS (Irish Health Repository)

    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.

  15. Al/Cl2 molten salt battery

    Science.gov (United States)

    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.

  16. 75 FR 1420 - Alabama Disaster # AL-00025

    Science.gov (United States)

    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...

  17. 76 FR 29810 - Alabama Disaster #AL-00037

    Science.gov (United States)

    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...

  18. 75 FR 26813 - Alabama Disaster #AL-00029

    Science.gov (United States)

    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...

  19. 78 FR 4967 - Alabama Disaster #AL-00046

    Science.gov (United States)

    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...

  20. 76 FR 62481 - Incapital LLC, et al.

    Science.gov (United States)

    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...

  1. 78 FR 22361 - Alabama Disaster #AL-00049

    Science.gov (United States)

    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...

  2. 78 FR 26100 - Alabama Disaster #AL-00050

    Science.gov (United States)

    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...

  3. 75 FR 3895 - Yale University, et al.;

    Science.gov (United States)

    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...

  4. 77 FR 7227 - Alabama Disaster #AL-00040

    Science.gov (United States)

    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...

  5. 75 FR 474 - Alabama Disaster #AL-00026

    Science.gov (United States)

    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...

  6. 76 FR 27141 - Alabama Disaster # AL-00036

    Science.gov (United States)

    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...

  7. 77 FR 60003 - Alabama Disaster #AL-00044

    Science.gov (United States)

    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...

  8. 75 FR 26814 - Alabama Disaster #AL-00031

    Science.gov (United States)

    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...

  9. Casting of particulate Al-base composites

    Energy Technology Data Exchange (ETDEWEB)

    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.)

  10. Synthesis of Ti-Al porous perform

    Directory of Open Access Journals (Sweden)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  12. CALCULUL CINETOSTATIC AL MECANISMELOR PLANETARE CILINDRICE

    Directory of Open Access Journals (Sweden)

    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.

  13. Cryptanalysis on Cheng et al. protocol

    Science.gov (United States)

    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.

  14. Del desarrollo rural al desarrollo territorial

    OpenAIRE

    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).

  15. Electron impact exctation of Al X

    Science.gov (United States)

    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

  16. The Science of al-Biruni

    OpenAIRE

    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.

  17. Thermoluminescence of LaAlO3

    International Nuclear Information System (INIS)

    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)

  18. Management of respiratory symptoms in ALS.

    LENUS (Irish Health Repository)

    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.

  19. Al-Ghazali on Moral Education

    Science.gov (United States)

    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…

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

    Science.gov (United States)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

  2. Wallada Bint al Mustakfi entre dos culturas

    Directory of Open Access Journals (Sweden)

    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.

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

    International Nuclear Information System (INIS)

    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

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

    Directory of Open Access Journals (Sweden)

    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

  5. Medien als Lernform und die Trimediale Redaktion

    Directory of Open Access Journals (Sweden)

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    International Nuclear Information System (INIS)

    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

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

    Science.gov (United States)

    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.

  9. Fabrication and Mechanical Properties of Al_2O_3/TiAl Composites

    Institute of Scientific and Technical Information of China (English)

    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.

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

    International Nuclear Information System (INIS)

    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)

  11. Electrical defects in AlGaN and InAlN

    Science.gov (United States)

    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.

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

    International Nuclear Information System (INIS)

    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

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

    Institute of Scientific and Technical Information of China (English)

    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.

  14. Al-rich region of Al−Pt

    International Nuclear Information System (INIS)

    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)

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

    Directory of Open Access Journals (Sweden)

    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.

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

    OpenAIRE

    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.

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

    Institute of Scientific and Technical Information of China (English)

    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.

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

    OpenAIRE

    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...

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

    International Nuclear Information System (INIS)

    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

  20. Atomic layer epitaxy of AlAs and AlGaAs

    Science.gov (United States)

    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.

  1. 5083 type Al-Mg and 6082 type Al-Mg-Si alloys for ship building

    Directory of Open Access Journals (Sweden)

    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.

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

    Science.gov (United States)

    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

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

    Institute of Scientific and Technical Information of China (English)

    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)

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

    OpenAIRE

    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...

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

    Indian Academy of Sciences (India)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

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

    International Nuclear Information System (INIS)

    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

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

    International Nuclear Information System (INIS)

    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

  9. 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

    Directory of Open Access Journals (Sweden)

    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.

  10. Función práxica y ganglios basales: contribuciones de los núcleos grises al movimiento voluntario.

    OpenAIRE

    Jorge Emiro Restrepo

    2010-01-01

    El texto tiene como objetivo revisar y analizar la evidencia teórica y empírica disponible sobre las aportaciones subcorticales a la Función práxica, y explorar las posibles relaciones teóricas que se presenten entre la Función práxica, los Ganglios Basales y el caso particular de las apraxias. Para tal fin, se procederá de la siguiente manera: primero, se presentarán razonadamente las estructuras que componen los Ganglios basales y se plantearán especificadamente los circuitos neuroanatómico...

  11. Calidad de vida, salud y ejercicio físico : una aproximación al tema desde una perspectiva psicosocial

    OpenAIRE

    Guillén García, Félix; Castro Sánchez, José Juan; Guillén García, Miguel Ángel

    1997-01-01

    El propósito del presente artículo es ofrecer algunas de las relaciones que se han establecido entre la Actividad Física y la Calidad de Vida. Asimismo, se pretende exponer algunas de las aportaciones surgidas de las investigaciones en este ámbito científico. En la última década, la Psicología del Deporte ha ampliado su ámbito de actuación, pasando a ocuparse entre otras cuestiones de la relación existente entre la Actividad Física y los posibles beneficios para los practicantes. Estos benefi...

  12. Salud pública y discapacidad. Planteamientos y propuestas del sector social de la discapacidad articulado en torno al CERMI ante la futura Ley estatal de Salud Pública

    OpenAIRE

    Jiménez Lara, Antonio

    2010-01-01

    El CERMI presenta en este documento las aportaciones del sector de la discapacidad en relación con la futura Ley de Salud Pública. Antes de ello, hace unas breves consideraciones sobre el derecho a la salud de las personas con discapacidad, tal y como está configurado en el ordenamiento vigente. También recoge, de manera concisa, algunos datos sobre la situación y las necesidades específicas de salud de las personas con discapacidad, obtenidos de la Encuesta de Discapacidad, Autonomía persona...

  13. La cultura de la empresa familiar como fuente de ventaja competitiva: una aplicación al sector de concesionarios de automoción

    OpenAIRE

    Vallejo-Martos, Manuel-Carlos

    2003-01-01

    [ES] Las aportaciones más significativas del presente trabajo de investigación pueden resumirse en las dos siguientes. En primer lugar, contrastar la singularidad de la cultura de la empresa familiar mediante un análisis comparativo entre empresas familiares y no familiares en lo que a los valores que definen el segundo nivel de la cultura organizacional se refiere. Dicho análisis evidencia que en las empresas familiares son mayores los niveles de implicación, identificación y...

  14. Oportunidades de adaptación al riesgo en el turismo costero. El caso de la badia de Roses, Costa Brava

    OpenAIRE

    Villares Junyent, Míriam; Roca Bosch, Elisabet; Oroval Junyent, Laia; Fonseca Casas, Maria del Carme

    2014-01-01

    La comunicación propone explorar y sondear la capacidad de adaptación y resistencia ante las situaciones de extremas o de crisis en sectores turísticos de sol y playa. Nos apoyamos en una revisión de las recientes aportaciones en el conocimiento y análisis de la capacidad de adaptación. El objetivo es aplicar este enfoque para comprender y discutir la capacidad de un territorio para mantener la sostenibilidad del sistema socioecológico asentado sobre el sector turístico, los espacios naturale...

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

    Science.gov (United States)

    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

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

    Directory of Open Access Journals (Sweden)

    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.

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

    Energy Technology Data Exchange (ETDEWEB)

    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.

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

    OpenAIRE

    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...

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

    OpenAIRE

    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...

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

    OpenAIRE

    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.