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Sample records for agregados estables al

  1. EL IMPUESTO AL VALOR AGREGADO Y EL COMERCIO ELECTRÓNICO EN LEGISLACIÓN TRIBUTARIA VENEZOLANA

    OpenAIRE

    Guerrero V. Francisco; Govea, Maria

    2006-01-01

    El Sistema Tributario venezolano ha tenido en el Impuesto al Valor Agregado (IVA) uno de los más grandes exponentes de la llamada tributación indirecta. El propósito de la investigación consistió en el análisis de la regulación del IVA al Comercio Electrónico, el cual se dimensiona sobre el aumento de valor que los autores presentes en la cadena de comercialización de bienes y servicios ofrecen en cada etapa. Se analizaron doctrinas de autores reconocidos, como son entre otros: Cedeño y Diaz ...

  2. El impuesto al valor agregado y el comercio electrónico en legislación tributaria venezolana

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    Francisco Guerrero

    2010-10-01

    Full Text Available El Sistema Tributario venezolano ha tenido en el Impuesto al Valor Agregado (IVA uno de los más grandes exponentes de la llamada tributación indirecta. El propósito de la investigación consistió en el análisis de la regulación del IVA al Comercio Electrónico, el cual se dimensiona sobre el aumento de valor que los autores presentes en la cadena de comercialización de bienes y servicios ofrecen en cada etapa. Se analizaron doctrinas de autores reconocidos, como son entre otros: Cedeño y Diaz J. (2004, García (2004, Palacios (2004, Moya (2006, Paredes (2004. La metodología utilizada fue la investigación documental descriptiva, con un tipo de diseño bibliográfico. La técnica para la recolección de datos fue la revisión bibliográfica y documental. Para la interpretación de los datos se utilizó la matriz de análisis de las categorías. Luego de la discusión de los resultados se llegó, a las siguiente conclusiones: a La Jurisprudencia venezolana reconoce el principio de la territorialidad del IVA; b La Ley del Impuesto al Valor Agregado, consagra el derecho de los contribuyentes a valerse de instrumentos privados, tales como: facturas o documentos equivalentes, libros de compras, libros de ventas, registros contables y archivos adicionales; c El Tribunal Supremo de Justicia, establece, la pérdida del derecho a la deducción del crédito fiscal cuando la omisión del requisito en la factura, impide o dificulta al Fisco Nacional efectuar sus labores de Control Fiscal: d En el comercio electrónico se observa la ausencia de algunos elementos constitutivos del hecho imponible, que configura el momento de la obligación tributaria y su base de cálculo.Palabras Clave: Impuesto al valor agregado (IVA, comercio electrónico, fisco nacional, control fiscal

  3. EL IMPUESTO AL VALOR AGREGADO Y EL COMERCIO ELECTRÓNICO EN LEGISLACIÓN TRIBUTARIA VENEZOLANA

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    Guerrero V. Francisco

    2006-07-01

    Full Text Available El Sistema Tributario venezolano ha tenido en el Impuesto al Valor Agregado (IVA uno de los más grandes exponentes de la llamada tributación indirecta. El propósito de la investigación consistió en el análisis de la regulación del IVA al Comercio Electrónico, el cual se dimensiona sobre el aumento de valor que los autores presentes en la cadena de comercialización de bienes y servicios ofrecen en cada etapa. Se analizaron doctrinas de autores reconocidos, como son entre otros: Cedeño y Diaz J. (2004, García (2004, Palacios (2004, Moya (2006, Paredes (2004. La metodología utilizada fue la investigación documental descriptiva, con un tipo de diseño bibliográfico. La técnica para la recolección de datos fue la revisión bibliográfica y documental. Para la interpretación de los datos se utilizó la matriz de análisis de las categorías. Luego de la discusión de los resultados se llegó, a las siguiente conclusiones: a La Jurisprudencia venezolana reconoce el principio de la territorialidad del IVA; b La Ley del Impuesto al Valor Agregado, consagra el derecho de los contribuyentes a valerse de instrumentos privados, tales como: facturas o documentos equivalentes, libros de compras, libros de ventas, registros contables y archivos adicionales; c El Tribunal Supremo de Justicia, establece, la pérdida del derecho a la deducción del crédito fiscal cuando la omisión del requisito en la factura, impide o dificulta al Fisco Nacional efectuar sus labores de Control Fiscal: d En el comercio electrónico se observa la ausencia de algunos elementos constitutivos del hecho imponible, que configura el momento de la obligación tributaria y su base de cálculo.

  4. Análisis de la estabilidad de agregados por el método de le bissonnais en tres órdenes de suelos Application of the le bissonnais method to assess aggregate stability in three soils orders

    OpenAIRE

    Emmanuel Adrián Gabioud; Marcelo Germán Wilson; María Carolina Sasal

    2011-01-01

    La estabilidad de agregados, por ser una característica dinámica, es considerada un indicador sensible de tendencias a la recuperación o degradación de los suelos. En la Argentina se han aplicado diferentes métodos de laboratorio para conocer su variación respecto al uso. El método de Le Bissonnais basado en el método de Henin, fue desarrollado por INRA de Francia. Se obtiene el diámetro medio ponderado de agregados estables con tres pretratamientos: humectación rápida (DMPe); disgregación me...

  5. Situación fiscal de las asociaciones de fomento barrial. Impuestos a las ganancias, al valor agregado y a los ingresos brutos

    OpenAIRE

    Frittayón, Federico

    2003-01-01

    Se analiza la situación fiscal de las asociaciones de fomento barrial frente a los impuestos a las ganancias, al valor agregado, y a los ingresos brutos, Luego de contextualizar jurídicamente a estos entes, en la tarea se abordan cada una de las cuestiones relevantes, estudiando la normativa, la jurisprudencia, la doctrina y la opinión fiscal, y dejando plasmada la opinión del autor en cada oportunidad, Se concluye que la exención tiene carácter subjetivo y amplio para el impuesto a las ganan...

  6. Influencia de la Canavalia ensiformis (L. D.C en la actividad biológica y distribución de los agregados del suelo en un área dedicada al cultivo del tabaco

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    Milagros García Rubido

    2015-01-01

    Full Text Available Con el objetivo de determinar la influencia de la canavalia (Canavalia ensiformis, L. como abono verde, en la actividad biológica y la distribución de las clases de agregados del suelo resistentes al agua, en un área de la Estación Experimental de San Juan y Martínez, dedicada al cultivo del tabaco (Nicotiana tabacum, L., se realizó un experimento unifactorial distribuido en bloques al azar con tres variantes y cuatro repeticiones, que incluyen el manejo de la canavalia inoculada con Hongos Micorrizícos Arbusculares (HMA, canavalia sin inocular y el testigo conformado por el suelo en barbecho. Se determinaron los contenidos de materia orgánica (MO, respiración basal edáfica (Rb y la distribución de los agregados del suelo resistentes al agua. La variante donde se inoculó la canavalia con HMA alcanzó los mejores resultados en los indicadores de respiración basal, contenido total de materia orgánica y la distribución de los agregados del suelo resistentes al agua. Los resultados indican que el tiempo que se dejan expuestos estos suelos a los factores climáticos en el proceso de preparación, puede anular los efectos positivos de los cultivos alternos en el mejoramiento de los indicadores evaluados.

  7. Caracterización de la relación señal/ruido de los potenciales evocados auditivos de estado estable durante la promediación

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    Alejandro Torres

    2004-01-01

    Full Text Available El presente estudio evalúa las variaciones que ocurren en la relación señal/ruido de los potenciales evocados auditivos de estado estable (PEAee a Mf provocado por múltiples tonos simultáneos modulados en amplitud, durante la promediación a lo largo del tiempo. Específicamente, se describen en forma cuantitativa las variaciones de la amplitud de los PEAee a Mf, el ruido residual y los estadígrafos utilizados para la detección automática de las respuestas (T2 Hotelling y T2 Circular. Se estudiaron ocho sujetos adultos sanos utilizando el sistema AUDIX IE. En cada sujeto se obtuvieron 128 registros individuales de los PEAee a Mf. Cada registro individual o ventana de análisis tenía 8192 muestras digitalizadas a 1,37 ms, de manera que el tiempo total de registro fue de 23,9 min . Se utilizó como estímulo una mezcla de tonos de 0,5, 1, 2 y 4 kHz modulados en amplitud a frecuencias de 77, 85, 93 y 101 Hz para el oído izquierdo y de 81, 89, 97 y 105 Hz para el derecho respectivamente. El estímulo fue presentado biauralmente a través de audífonos suprauriculares (TDH - 49 a una intensidad cercana al umbral (20 dB nHl. Se encontró que la amplitud de los PEAee a Mf fluctúa inicialmente en forma variable y alcanza un valor estable a partir de la promediación de 20 registros. Por otra parte, el ruido residual decrece en forma monotónica siguiendo una relación cuadrática con el número de promediaciones. Ambos estadígrafos (T2C y T2H siguen un comportamiento similar y alcanzan valores significativos estables a partir de la promediación de 30 registros. Estas variaciones de la relación señal/ruido cumplen los supuestos implícitos en la promediación de manera que se afirma como válido este método para la extracción de los PEAee a Mf. Asimismo, la caracterización paramétrica realizada brinda información útil para el perfeccionamiento de la audiometría objetiva mediante PEAee a Mf.

  8. Respuesta del cultivo de trigo al agregado de azufre en el sudeste bonaerense Wheat response to sulphur fertilization in the southeast bonaerense

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    Nahuel Ignacio Reussi Calvo

    2006-07-01

    Full Text Available La intensificación de la agricultura en los últimos años, en la Región Pampeana y en el sudeste bonaerense en particular, provocó una disminución de la disponibilidad de azufre (S en los suelos. Frente a esta situación, se planteó como objetivo evaluar el efecto de la fertilización azufrada sobre el rendimiento y el contenido de proteína en grano de trigo (Triticum aestivum L., como así también su interacción con nitrógeno (N. Además se evalúan algunas de las metodologías de diagnóstico de S citadas en la literatura. Los experimentos (Experimento A: bajo SD y LC; Experimento B: bajo SD se realizaron durante las estaciones de crecimiento 2003 y 2004 en la EEA INTA-Balcarce. En el Experimento A los tratamientos fueron: sistemas de labranza (LC y SD asignados a las parcelas principales y combinación de nutrientes (T: testigo; NP: nitrógeno + fósforo; NPS: nitrógeno + fósforo + azufre asignados a las subparcelas. Las dosis de nutrientes utilizadas fueron de 120 kg N ha-1, 30 kg P ha-1 y 15 kg S ha-1. Para el Experimento B los tratamientos fueron dosis de N (70 y 130 kg ha-1 y de S (0 y 15 kg ha-1. Ambos experimentos fueron conducidos sin deficiencias de P y en condiciones de secano. En el Experimento B y para las dos campañas agrícolas el agregado de S incrementó el rendimiento (4.703 vs 5.328 kg ha-1 sin y con S, respectivamente, mientras que en el Experimento A, la fertilización con S incrementó el rendimiento (4.172 vs 4.748 kg ha-1, sin y con S, respectivamente sólo en el 2004 bajo SD. No se determinó respuesta en el contenido de proteína en grano por el agregado de S. La eficiencia de uso del N fue ligeramente mejorada por el agregado de S. La determinación de los contenidos de sulfato en el suelo en los primeros 20 cm, como así también la relación N/S total en grano no diagnosticaron satisfactoriamente la respuesta al agregado de S. Sin embargo, la determinación de S-SO4 = en suelo (0-60 cm al momento de la

  9. Antecedentes del patrimonio estable (c. 1291 del CIC de 1983)

    OpenAIRE

    Zalbidea, D. (Diego)

    2007-01-01

    El patrimonio estable, al menos desde el punto de vista formal, es una novedad introducida en el CIC de 1983. Sus antecedentes están relacionados con el régimen de protección del patrimonio eclesiástico frente a determinadas enajenaciones. El autor ha estudiado fundamentalmente el periodo que va desde la Constitución Apostólica 'Ambitiosae' de 1468 hasta el CIC de 1917, centrando su trabajo en la primera codificación. Los documentos del 'Archivo Secreto Vaticano' han arrojado mucha luz sobre ...

  10. Miopatias associadas a agregados tubulares

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    Mary Souza Carvalho

    1993-09-01

    Full Text Available Os autores relatam a caso de paciente de 58 anos de idade do sexo masculino, com quadro de características miastênicas tanto clínica como eletromiograficamente, no qual a biópsia muscular com histoquímica e microscopia eletrônica permitiu fazer o diagnostico de miopatia associada a agregados tubulares. É chamada a atenção para o fato de que as alterações anátomo-patológicas encontradas podem estar presentes em um grupo heterogêneo de pacientes com grande variedade de sintomas, não havendo portanto motivo para considerar-se a existência de uma miopatia com agregados tubulares, já que os achados anátomo-patológicos são inespecíficos e não configuram moléstia específica.

  11. El coeficiente de Hurst y el parámetro a-estable para el análisis de series financieras. Aplicación al mercado cambiario mexicano

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    Román Rodríguez Aguilar

    2014-01-01

    Full Text Available Este trabajo aborda la utilidad de estimar, previo a cualquier análisis, el parámetro de la distribución -estable y el coe - ficiente de Hurst para una serie financiera en periodos de alta volatilidad. Mediante la estimación del coeficiente de Hurst y el parámetro se busca explorar la violación de dos grandes supuestos en la modelación de series financieras: suponer que las series presentan una distribución normal y que los rendi - mientos sucesivos son independientes; asimismo, se analiza el caso del tipo de cambio Fix peso-dólar en México en el perio - do 1992-2011. Uno de los principales resultados es la identi - ficación de características fractales y colas pesadas en la serie para algunos periodos en magnitudes diferenciadas; dichas diferencias se acentúan en periodos de crisis. Caracterizar la serie mediante estos parámetros a través de un índice permitirá mejorar la toma de decisiones sobre el tipo de análisis que es metodológicamente correcto aplicar en una ventana de tiempo específica, ya sea para valuación de activos o para la gestión de riesgos.

  12. Una aproximación a la demanda de los principales agregados monetarios en el Perú: Junio 1991-Mayo 1997

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    Quispe Misaico, Zenón

    1998-01-01

    El presente informe resume los resultados de la estimación de la demanda por los principales agregados monetarios en el Perú en el período comprendido entre junio de 1991 y mayo de 1997. Luego de un examen exhaustivo de especificaciones alternativas para agregados monetarios de distintos grados de liquidez y para varios períodos muestrales se ha podido identificar al menos una relación de equilibrio de largo plazo para cada agregado monetario con relación al producto bruto interno (PBI), a la...

  13. Uso da terra e a qualidade microbiana de agregados de um Latossolo Vermelho-Amarelo

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    Rogério Melloni

    2013-12-01

    Full Text Available A maioria dos estudos relacionados à agregação do solo associa o efeito de manejos ou tipos de uso da terra ao teor de matéria orgânica. No entanto, a avaliação de microrganismos e seus processos, feita diretamente em estruturas indeformadas do solo, permite maior entendimento do real efeito de diferentes tipos de manejos exercidos sobre esse. Assim, o objetivo deste trabalho foi avaliar modificações impostas por diferentes tipos de uso da terra (pastagem, mata de eucalipto, mata com araucária, plantio convencional com cenoura e plantio convencional com abóbora em atributos químicos (pH, Ca, Mg, Al, P, K, S e matéria orgânica e físicos (diâmetro médio geométrico - DMG, diâmetro médio ponderado - DMP, densidade do solo e densidade de partículas e na qualidade microbiana (atividade e carbono microbianos, micélio extrarradicular total de fungos micorrízicos arbusculares e quociente metabólico - qCO2 de classes de tamanho de agregados (I- 4,00 a 2,36 mm; II- 2,36 a 1,18 mm; III- 1,18 a 0,60 mm; IV- 0,60 a 0,30 mm; e V- 0,30 a 0,15 mm de um Latossolo Vermelho-Amarelo, no sul de Minas Gerais. Os resultados evidenciaram que os tipos de uso da terra interferem na formação, no tamanho e na qualidade microbiana dos agregados. Em agregados menores (classes IV e V, há redução de micélio extrarradicular de fungos e biomassa microbiana e aumento da atividade e do quociente metabólico, independentemente do tipo de uso da terra. A qualidade microbiana de agregados maiores do solo sob mata de araucária, com tamanho entre 0,60 e 4,00 mm (I, II e III, é semelhante a todas as classes de tamanho de agregados do solo sob mata de eucalipto, enquanto a de agregados menores de 0,60 mm (IV e V é semelhante a todas de tamanho de agregados da pastagem. Agregados do cultivo convencional, diferentemente dos demais tipos de uso da terra, apresentam baixa qualidade microbiana e relação com a fertilidade do solo.

  14. Ecuador: cuando la inestabilidad se vuelve estable

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    Pachano , Simón

    2005-09-01

    Full Text Available El presente artículo busca explicaciones para los derrocamientos de tres presidentes ecuatorianos, que han marcado los puntos culminantes de una década de inestabilidad. Lo hace indagando en el campo de las movilizaciones sociales que precedieron a cada uno de esos hechos, con especial referencia a su composición social y a los objetivos de sus integrantes. En la parte final se proponen algunas hipótesis acerca de la movilización en contra del gobierno de Gutiérrez. Sugiere que no son válidas las explicaciones de racismo y de temor clasista. Enlaza la explicación al surgimiento de reivindicaciones democráticas originadas tanto en los bajos rendimientos del sistema político como en el carácter dictatorial que iba tomando el último gobierno.

  15. Informe de nuevas variedades. SAMILA, NUEVO CULTIVAR CUBANO DE PAPA CON RENDIMIENTO ALTO Y ESTABLE PARA EL CONSUMO FRESCO

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    Jorge L. Salomón Díaz

    2011-01-01

    Full Text Available Con el objetivo de obtener una nueva variedad depapa con rendimientos altos y estables, tolerancia a las principalesenfermedades que atacan al cultivo en Cuba, calidad del tubérculoy buena conservación en cámara refrigerada, se cruzaron lavariedad 'Desirée' con el cultivar cubano 'Lizette' de rendimientoalto y se obtuvo el nuevo cultivar cubano 'Samila'.

  16. Inferencias paleodietarias mediante isótopos estables en restos óseos humanos provenientes de Tierra del Fuego, Argentina

    OpenAIRE

    Schinder, Gala; Guichón, Ricardo Aníbal; Comparatore, Viviana; Burry, Susana

    2003-01-01

    Las actuales lineas de acción vinculadas al uso de isótopos estables en la Isla Grande de Tierra del Fuego están orientándose a acotar factores de variación (especialmente la variación espacial y temporal) y al cruce con otras lineas de evidencias como los estilos de vida. A partir de la ocupación europea en el Siglo XVIII se modificó el estilo de vida de las poblaciones históricas de la región. El presente trabajo tiene como objetivos explorar la variabilidad en cuanto al tipo de recursos co...

  17. Mobiliario urbano prefabricado en concreto con agregado grueso reciclado

    OpenAIRE

    Rosas Chaves, Jeison Andrés

    2014-01-01

    La presente investigación busca obtener un prototipo de banca como elemento de mobiliario urbano en concreto con agregado grueso reciclado, producto de residuos de la construcción y la demolición de la ciudad de Bogotá; una ciudad con un agotamiento de extracción de agregados naturales y alta cantidad de residuos de la construcción sin la adecuada disposición final. Se ha partido del estudio del comportamiento de los agregados reciclados, resultados similares en su proceso de f...

  18. ANÁLISIS DE SISTEMAS ASFALTO-AGREGADO A PARTIR DE MEDICIONES DE ENERGÍA SUPERFICIAL LIBRE

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    ALLEX E. ALVAREZ

    2012-01-01

    Full Text Available La energía superficial libre (ESL es una propiedad termodinámica fundamental de los materiales que puede ser empleada para cuantificar la calidad de la adhesión entre diversos materiales, la susceptibilidad de éstos a perder su adhesión por la presencia de agua en el sistema y la capacidad del recubrimiento de un material sobre otro con diferentes valores de ESL (i.e., humectabilidad. Estos principios son aplicables a diferentes materiales, incluidos los sistemas asfalto-agregado (i.e., mezclas asfálticas. El presente trabajo tiene como objetivo principal presentar un análisis, basado en mediciones de ESL de los materiales constitutivos de las mezclas asfálticas, mediante el cual se puede cuantificar la calidad de la adhesión, la susceptibilidad al daño por humedad y la calidad del recubrimiento del asfalto sobre el agregado en diversos sistemas asfalto-agregado. Las mediciones de ESL de asfaltos y agregados fueron realizadas en laboratorio a través del método de la Placa Wilhelmy y de la Máquina de Adsorción Universal (USD, respectivamente. Los materiales evaluados incluyeron asfaltos colombianos y agregados de origen colombiano y norteamericano. El análisis específico consistió en evaluar el efecto de procesos industriales de modificación y la adición de llenante mineral sobre la calidad de la adhesión, la susceptibilidad al daño por humedad y la humectabilidad de diversos sistemas asfalto-agregado. Los resultados sugieren que la medición de la ESL de asfaltos y agregados es una herramienta eficiente para evaluar la compatibilidad y el desempeño esperado de diversos sistemas asfalto-agregado, así como los cambios inducidos a nivel fundamental por diferentes procesos propios de la fabricación de mezclas asfálticas (e.g., adición de llenante mineral.

  19. Is There More than One Way to be E-Stable?

    OpenAIRE

    Joseph Pearlman

    2007-01-01

    We initially examine two different methods for learning about parameters in a Rational Expectations setting, and show that there are conflicting E-stability results. We show that this conflict also extends to Minimum State Variable (MSV) representations. One of these methods of learning lends itself to the examination of E-stability for the generic forward-looking rational expectations model. This leads to a completely general relationship between saddlepath stability and E-stability, and a g...

  20. DESARROLLO DE UN CATALIZADOR ESTABLE DE NIQUEL SOBRE ALUMINA PARA EL REFORMADO DE METANO CON DIOXIDO DE CARBONO

    OpenAIRE

    Becerra, A; M. DIMITRIJEWITS; C. ARCIPRETE; A. CASTRO-LUNA

    2000-01-01

    Un catalizador de Ni (10.6% p/p) soportado sobre gamma alúmina, reducido a alta temperatura (> 1100 K), resultó activo y estable para el reformado de metano con dióxido de carbono. El soporte de gama alúmina fue obtenido por una técnica sol-gel. El catalizador mantuvo su actividad durante más de 100 horas a 973 K, produciendo muy poco coque (< 1% en peso). Los resultados experimentales de actividad fueron analizados satisfactoriamente a la luz de un modelo pseudo homogéneoNi (10.6 wt.-%) supp...

  1. Estructura fractal de los agregados coloidales en 2-D

    OpenAIRE

    Mart??nez L??pez, Francisco

    2000-01-01

    En esta Tesis Doctoral se presenta un estudio de procesos de agregaci??n coloidal en dos dimensiones. Para ello, se han caracterizado las estructuras de los agregados obtenidos experimentalmente y se han descrito las cin??ticas de agregaci??n. La caracterizaci??n estructural de los agregados se ha realizado mediante la determinaci??n de la dimensi??n fractal y la anisotrop??a de los mismos. Mediante estas variables es posible distinguir entre ...

  2. Determinaciones de isótopos estables en restos humanos de la región Cantábrica : Aportación al estudio de la dieta de las poblaciones del Mesolítico y el Neolítico

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    Pablo Arias Cabal

    2005-01-01

    Full Text Available Se presentan los resultados de una serie de análisis de isótopos estables de carbono y el nitrógeno realizados sobre colágeno de huesos humanos del Paleolítico Superior, el Mesolítico, el Neolítico, la Edad del Bronce y las Edades Media y Moderna. Como en otras zonas de la Europa atlántica, en la región Cantábrica se constata un fuerte incremento del consumo de proteínas de origen marino durante el Mesolítico, y un regreso a una dieta básicamente terrestre en el Neolítico. La variabilidad constatada en las muestras mesolíticas permite plantear la coexistencia de grupos que explotaban los recursos marinos y otros centrados en las zonas interiores.

  3. MECHANICAL BEHAVIOR OF HIGH PERFORMANCE CONCRETE WITH RECYCLED AGGREGATES = ESTUDO MECÂNICO DO CONCRETO DE ALTO DESEMPENHO COM AGREGADO RECICLADO

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    Maria da Consolação Fonseca Albuquerque

    2010-01-01

    Full Text Available The utilization of recycled aggregates can minimize environmental impact, and decreases the consumption of natural resources used for concrete applications. However, recycled aggregates are not suitable for use in the production of High Performance Concrete (HPC due to their relatively high absorption capacity, instable properties and weaker strength. Such difficulties can be overcome through selection and partial substitution of aggregates. In this paper, recycled aggregates generated from demolished-construction wastes were selected and different perceptual were substituted through natural aggregates for application in the HPC. Results show that specimens containing partially recycled aggregates are optimum for producing normal strength recycled aggregates concrete. = A utilização de agregados reciclados em concreto, além de minimizar o impacto ambiental diminui o enorme consumo de fontes naturais. Entretanto, os agregados reciclados não são usados na produção de Concreto de Alto Desempenho (CAD devido à alta capacidade de absorção de água, propriedades instáveis e fraca resistência. Tais dificuldades podem ser minimizadas com a seleção e a substituição parcial do agregado. No presente trabalho os agregados, gerados de demolição das construções, foram selecionados e diferentes porcentagens do mesmo foram usadas em substituição ao agregado natural para confecção do CAD. Os resultados mostraram que o agregado reciclado pode substituir parcialmente o agregado natural, para o mesmo traço, sem perda de resistência e com uma alteração bastante pequena na relação água/ cimento das composições estudadas, havendo necessidade de uma maior quantidade de água para se obter um abatimento igual ao obtido para o concreto sem adição de resíduo.

  4. Valuación de opciones sobre subyacentes con rendimientos a-estables

    Directory of Open Access Journals (Sweden)

    José Antonio Climent Hernández

    2013-01-01

    Full Text Available En este trabajo se analiza el modelo log-estable para valuación de opciones europeas; se estiman los parámetros de la distribución de la tasa de depreciación del tipo de cambio peso-dólar a través de los siguientes métodos: 1 máxima verosimilitud, 2 tabulación por cuantiles de las distribuciones estables y 3 regresión sobre la función característica de la muestra; se realiza un análisis cualitativo para mostrar la calidad en el ajuste de la distribución del rendimiento; a través de un análisis cuantitativo se elige la mejor estimación de los parámetros estables y se compara el modelo log-estable ortogonal de McCulloch (2003 con el modelo log-normal de Black y Scholes (1973 y un vector de precios del MexDer; finalmente, se demuestra que el modelo log-estable presenta ventajas sobre el modelo log-normal.

  5. Estabilidad del color del Agregado Trióxido Mineral

    OpenAIRE

    Vallés Rodríguez, Marta

    2014-01-01

    El agregado trióxido mineral (MTA) es un material restaurador utilizado en endodoncia. Según su lugar de colocación, su color será importante en el resultado estético final del diente restaurado. El MTA está comercializado en color blanco para estas indicaciones estéticas, sin embargo se ha observado que a veces cambia de color. En este estudio hemos observado que el MTA blanco se oscurece cuando simultáneamente está en un ambiente sin oxígeno y recibe una fuente de luz. Llegamos a la hipó...

  6. Comportamiento elástico del concreto con agregado reciclado

    OpenAIRE

    Gámez García, Diana C.; Arredondo Rea, Susana Paola; Gómez Soberón, José Manuel Vicente; Almaral Sánchez, Jorge Luis; Castorena González, J.H.; Corral Higuera, Ramón

    2012-01-01

    Con el fin de participar activamente en la sustentabilidad de la industria de la construcción, se ha propuesto mejorar la durabilidad de las estructuras de concreto y el reemplazo parcial o total de sus componentes por materiales reciclados, de tal modo que sea factible reducir el insostenible impacto que ésta representa en la naturaleza. En el presente estudio se evaluó el comportamiento elástico del concreto fabricado con agregado reciclado. Se sabe que el comportamiento elástico del concre...

  7. Análisis de la estabilidad de agregados por el método de le bissonnais en tres órdenes de suelos Application of the le bissonnais method to assess aggregate stability in three soils orders

    Directory of Open Access Journals (Sweden)

    Emmanuel Adrián Gabioud

    2011-12-01

    Full Text Available La estabilidad de agregados, por ser una característica dinámica, es considerada un indicador sensible de tendencias a la recuperación o degradación de los suelos. En la Argentina se han aplicado diferentes métodos de laboratorio para conocer su variación respecto al uso. El método de Le Bissonnais basado en el método de Henin, fue desarrollado por INRA de Francia. Se obtiene el diámetro medio ponderado de agregados estables con tres pretratamientos: humectación rápida (DMPe; disgregación mecánica luego de rehumectación con etanol (DMPd y humectación lenta por capilaridad (DMPc y, con el promedio se determina un valor que sintetiza la información (DMPm. A nivel mundial fue aplicado en suelos de diferentes condiciones de clima y manejo; sin embargo, es necesario conocer su comportamiento en suelos de la Argentina. Los objetivos fueron: i evaluar el método Le Bissonnais para utilizarlo como indicador de degradación en lotes con diferente grado de intervención en tres órdenes de suelo (Molisol, Vertisol y Alfisol, ii relacionar el DMP con el contenido de carbono orgánico (C, iii correlacionar los métodos de Le Bissonnais y Hénin y iv cuantificar el tiempo operativo requerido en el procedimiento de determinación de la estabilidad de agregados. El método resultó ser sensible para discriminar condiciones de uso y manejo en los tres suelos analizados, reflejando tendencias al deterioro y a la recuperación. Se encontró relación positiva y significativa entre contenido de carbono orgánico y estabilidad de agregados (R²=0,30. Hubo correlación significativa entre ambos métodos (r=0,51, que varió según el suelo, existiendo alto grado de corre­lación en Molisol, medio en Alfisol y sin asociación en Vertisol. Existieron asociaciones entre los coeficientes de variación de ambos métodos, siendo mayores con Hénin. Los resultados contribuirán a profundizar en el análisis de mecanismos de agregación y desa

  8. Tratamiento de la información estable e información perecedera en un centro de información : características y diferencias. Prácticas para la elaboración de clasificaciones adaptadas a los centros de información juvenil e información al ciudadano

    OpenAIRE

    Alonso-Arévalo, Julio

    2003-01-01

    [ES] Los centros de información juvenil y al ciudadano por sus propias características y la documentación que recogen, procesan y difunden, han de disponer de sistemas de clasificación que faciliten en la medida de lo posible el acceso a la información. Se exponen diferentes soluciones para diferentes tipos, formatos y soportes de información. La elaboración de dosieres temáticos, las clasificaciones por centros de interés y la organización de la información a través de sistemas nemotécnicos ...

  9. Macrozoobentos asociado a los agregados de Phyllochaetopterus socialis Claparède, 1870 en el puerto de Mar del Plata, Argentina Macrobenthos associated with Phyllochaetopterus socialis Claparède, 1870 aggregates in Mar del Plata harbour, Argentina

    OpenAIRE

    Mariano Albano; Juan Seco Pon; Sandra Obenat

    2006-01-01

    Los agregados del poliqueto Phyllochaetopterus socialis fueron registrados por primera vez en el puerto de Mar del Plata en diciembre de 2003. Estos se hallaron aproximadamente a 6 m de profundidad en el límite entre las rocas de la escollera y el sedimento blando. Tres muestras de agregados fueron obtenidas al azar, con frecuencia mensual o bimensual, en cada estación del año mediante buceo. Se registraron 56 especies pertenecientes a 11 phyla: Porifera, Cnidaria, Nematoda, Plathyhelminta, A...

  10. Modelo de motor de inducción agregado aplicado en caracterización energética//Aggregate induction motor model applied in energetic characterization

    Directory of Open Access Journals (Sweden)

    Ignacio Romero-Rueda

    2012-09-01

    Full Text Available La caracterización energética de motores de inducción se dificulta por el volumen de mediciones y cálculo a realizar cuando el número de motores es superior a la decena. En este trabajo se desarrolló un modelo de motor de inducción agregado que permite la caracterización energética equivalente al grupo de motores. El modelo de motor de inducción agregado se obtuvo por balance de potencia entre el equivalente y los motores individuales en régimen estacionario. Se utilizó la herramienta SimPowerSystem de MATLAB en la simulación del motor agregado y los motores individuales para determinar el comportamiento energético ante las cargas acopladas y comparar los resultados. Los cambios en las cargas de los motores individuales originaron respuestas en las magnitudes del motor agregado con errores menores del 5 % comparada con las respuestas resultantes del grupo de motores, concluyendo que el agregado respondió satisfactoriamente y existe una equivalencia con fines energéticos al grupo de motores.Palabras claves: motor de inducción, motor de inducción agregado, caracterización energética.______________________________________________________________________________AbstractThe energetic characterization of induction motors is difficult by the volume of measurement and calculation to carry out when the number of motors is bigger than the tens. In this work developed a model of aggregate induction motor that allows the equivalent energy characterization to a group of motors. Themodel of aggregate induction motor was obtained by the balance of powers between the equivalent one and the individual motors in steady-state. Used the toolbox SimPowerSystem of MATLAB the aggregate motor and the individual motors are simulated, to determine the energy behavior before the coupled loadsand to compare the results. Changes in the individual motors loads originated answers in the magnitudes of the motor aggregate with errors smaller than 5% compared

  11. Valuación de opciones sobre subyacentes con rendimientos a-estables

    OpenAIRE

    José Antonio Climent Hernández; Francisco Venegas Martínez

    2013-01-01

    En este trabajo se analiza el modelo log-estable para valuación de opciones europeas; se estiman los parámetros de la distribución de la tasa de depreciación del tipo de cambio peso-dólar a través de los siguientes métodos: 1) máxima verosimilitud, 2) tabulación por cuantiles de las distribuciones estables y 3) regresión sobre la función característica de la muestra; se realiza un análisis cualitativo para mostrar la calidad en el ajuste de la distribución del rendimiento; a través de un anál...

  12. Inferencias paleodietarias mediante isótopos estables en restos óseos humanos provenientes de Tierra del Fuego, Argentina

    Directory of Open Access Journals (Sweden)

    Schinder, Gala

    2003-01-01

    Full Text Available Las actuales lineas de acción vinculadas al uso de isótopos estables en la Isla Grande de Tierra del Fuego están orientándose a acotar factores de variación (especialmente la variación espacial y temporal y al cruce con otras lineas de evidencias como los estilos de vida. A partir de la ocupación europea en el Siglo XVIII se modificó el estilo de vida de las poblaciones históricas de la región. El presente trabajo tiene como objetivos explorar la variabilidad en cuanto al tipo de recursos consurnidos por hombres y mujeres a partir de la información isotópica obtenida de huesos de individuos provenientes de diferentes sectores geográficos (Norte, Sudeste y Beagle y la determinación de la composición de la dieta en términos de contenido proteico. Los datos isotópicos se complementaron con información etnográfica. El análisis Kruskal-Wallis sugiere que existen diferencias significativas entre los diferentes sectores geográficos, pero no se registraron diferencias significativas entre hombres y mujeres. Asimismo, los isótopos indican que los individuos del Sudeste consumían preferentemente dietas más ricas en proteínas que sus vecinos del norte de la Isla. En los últimos años, ha crecido el interé por los estudios orientados al análisis de la división sexual del trabajo en sociedades cazadoras recolectoras. Este trabajo constituye un primer aporte para evaluar la variabilidad en cuanto a las diferencias en la obtención de recursos entre sexos y el tipo de dieta en individuos históricos de Tierra del Fuego.

  13. Desempenho de concretos com agregados reciclados de cerâmica vermelha Performance of red ceramic recycled aggregate concrete

    Directory of Open Access Journals (Sweden)

    A. E. B. Cabral

    2009-12-01

    Full Text Available Os resíduos de construção e demolição (RCD constituem uma importante parcela dos resíduos sólidos produzidos nas cidades brasileiras, correspondendo em torno de 50% dos resíduos sólidos urbanos. Dentre os diversos constituintes do RCD, a cerâmica vermelha, proveniente de restos de tijolos e telhas cerâmicas utilizados nas construções, equivale a uma considerável parcela destes resíduos. A reciclagem do RCD para a produção de agregados reciclados tem se tornado uma prática cada vez mais comum, particularmente em cidades onde há uma inacessibilidade ou escassez de agregados naturais, proporcionando altos custos para adquiri-los. Com o intuito de se determinar o comportamento do agregado reciclado de cerâmica vermelha na produção de concretos, desenvolveu-se um programa experimental baseado em um projeto de experimentos onde se substituiu os agregados miúdos e graúdos naturais pelos seus respectivos reciclados, além de se variar a relação água/cimento. Os concretos produzidos foram analisados com relação a três propriedades: resistência à compressão, módulo de deformação e volume de poros permeáveis (VPP. Os resultados obtidos foram analisados utilizando-se ferramentas estatísticas, desenvolvendo-se modelos matemáticos que descrevem o comportamento das propriedades estudadas ao se substituir o agregado natural pelos reciclados de cerâmica vermelha. Todos os modelos obtiveram excelentes coeficientes de determinação, acima de 95%. Simulações realizadas utilizando-se os modelos propostos apontam que a substituição do agregado miúdo natural pelo miúdo reciclado resulta em um acréscimo da resistência à compressão dos concretos produzidos e para a substituição do agregado graúdo natural pelo graúdo reciclado, um decréscimo. Para as demais propriedades do concreto estudadas, observou-se que a utilização dos agregados reciclados, tanto graúdo quanto miúdo, influi negativamente no comportamento

  14. Consecuencias patrimoniales de la ruptura voluntaria de la pareja estable en Navarra

    OpenAIRE

    Hernández Acero, Paula

    2015-01-01

    El presente trabajo trata de reflexionar sobre una temática de notable actualidad como es la relativa a las controversias que pueden llegar a surgir en relación con la ruptura voluntaria de la unión estable. En particular, serán objeto de tratamiento los efectos patrimoniales ocasionados por la extinción de dichas uniones. Como tendrá ocasión de comprobarse, la cuestión a tratar dista aún de ser clara y homogénea en cuanto a su planteamiento y soluciones, a pesar de las abundan...

  15. Prevalencia de hiperparatiroidismo secundario en pacientes con insuficiencia cardíaca estable

    OpenAIRE

    Donaire Sansó, Gemma

    2016-01-01

    OBJETIVOS: El objetivo principal fue determinar la prevalencia de hiperparatiroidismo secundario (sHPT) y de déficit de vitamina D (DVD) en pacientes con insuficiencia cardíaca (IC) estable. Otros objetivos fueron: analizar la relación entre sHPT/DVD y los tratamientos de la IC, evaluar su relación con datos ecocardiográficos, clínicos y analíticos, la relación con otros biomarcadores y con la morbimortalidad, así como determinar los pacientes candidatos a realizar tratamiento del sHPT. ...

  16. Soluciones numéricas estables de sistemas acoplados mixtos de ecuaciones en derivadas parciales.

    OpenAIRE

    Casabán Bartual, Mª Consuelo

    2010-01-01

    Esta memoria trata sobre la construcción de soluciones numéricas estables de sistemas parabólicos e hiperbólicos acoplados. Las etapas características de esta memoria son: la construcción de soluciones discretas utilizando diferencias finitas y una técnica de separación de variables discreta, el estudio de la estabilidad y la consistencia de la solución calculada, y el empleo de un método de proyecciones para extender los resultados obtenidos a una clase más general de funciones de valores in...

  17. Nuevas determinaciones de isótopos estables para Tierra del Fuego

    OpenAIRE

    Guichón, Ricardo Aníbal; Borrero, Luis Alberto; Prieto, Luis A.; Cárdenas, Pedro; Tykot, Robert

    2001-01-01

    Se presentan los resultados del análisis de isótopos estables (d 13C y d 15N sobre colágeno, d 13C sobre apatita) de 8 muestras óseas procedentes de Tierra del Fuego que, junto con 15 determinaciones previas, informan sobre la variación en la subsistencia de poblaciones de cazadores-recolectores. Se observa que los valores más "marítimos" se encuentran en el conjunto Sudeste de la Isla Grande. Por otra parte, los más "continentales" se encuentran en el conjunto Norte de la Isla Grande. Es int...

  18. [Dynamic study of small metallic clusters]; Estudio Dinamico de Pequenos Agregados Metalicos

    Energy Technology Data Exchange (ETDEWEB)

    Lopez, M.J. [Valladolid Univ. (Spain). Dept. de Fisica Teorica; Jellinek, J. [Argonne National Lab., IL (United States)

    1995-12-31

    We present a brief introduction to computer simulation techniques (particularly to classical molecular dynamics) and their application to the study of the thermodynamic properties of a material system. The basic concepts are illustrated in the study of structural and energetic properties such as the liquid-solid transition and the fragmentation of small clusters of nickel. [Espanol] Presentamos una breve introducci{acute o}n de las t{acute e}cnicas de simulaci{acute o}n por ordenador (en particular de la Din{acute a}mica Molecular cl{acute a}sica) y de su aplicaci{acute o}n al estudio de las propiedades termodin{acute a}micas de un sistema material. Los conceptos b{acute a}sicos se ilustran en el estudio de las propieades estructurales y energ{acute e}ticas, as{acute i} como de la transici{acute o}n de fase s{acute o}lido-l{acute i}quido y de las fragmentaciones de peque{tilde n}os agregados de n{acute i}quel.

  19. A gênese do imposto sobre o valor agregado

    Directory of Open Access Journals (Sweden)

    Ubaldo César Balthazar

    2008-06-01

    Full Text Available Este artigo tem como objetivo analisara história do princípio das deduções, ínsito aoImposto sobre o Valor Agregado, a partir de umaanálise de textos das doutrinas francesa e belga,principalmente. Procura demonstrar que, ao contráriodo que pretendem autores franceses, o citadoprincípio não foi pensado originalmente naFrança, mas foi antes produto de um processoevolutivo registrado em vários ordenamentos positivos.Em um segundo momento é estudada ainstituição do IVA francês, verificando-se os avançose recuos, as dificuldades encontradas no longoprocesso de consolidação do imposto naquele país.Com isso pretende-se oferecer uma reflexão à doutrinabrasileira, no momento em que se discute ainstituição de um imposto sobre o valor agregadono direito positivo pátrio.The objective of the article is toanalyze the history of the principles ofdeduction, in accordance with the ‘Tax on AddedValue’, and primarily from an analysis of textsof the French and Belgian doctrine. The articlewill demonstrate that, in contrast of intendFrench authors, cited principle was not thoughtoriginally in France, but rather a registeredevolutionary process in some positive orders.Secondly, the French institution IVA will bestudied, assessing its pros and cons as well aslooking at the difficulties found in the longprocess of tax consolidation in that country. Thisis intended to offer a reflection of thecorresponding Brazilian doctrine, when it isbeing discussed the imposition of a ‘Tax onAdded Value’ in the native positive law.Keys-words: Tax, Principle of deduction, TaxHistory, Buttoir rule, Added value.

  20. Estudio teórico de pequeños agregados binarios constituidos por elementos de los grupos III y V

    OpenAIRE

    Ferraresi Curotto, Verónica

    2011-01-01

    Los compuestos constituidos por elementos de los grupos III/V, al ser destacados semiconductores, han sido objeto de intensas investigaciones tanto experimentales como teóricas debido a sus aplicaciones en catálisis y en la fabricación de dispositivos a nanoescala. Sin embargo, la obtención de estos agregados de manera experimental no es tarea fácil. Algunas técnicas de preparación requieren tecnologías de deposición de vapor a temperaturas cercanas a los 1000 °C. Por ello, una meta important...

  1. Una nueva categoría docente en la universidad española del franquismo: la aparición en escena del profesor agregado

    Directory of Open Access Journals (Sweden)

    Sara GONZÁLEZ GÓMEZ

    2016-01-01

    Full Text Available La Ley sobre estructura de las facultades universitarias y su profesorado aprobada el 17 de julio de 1965 colocó la figura del profesor agregado sobre el escenario universitario. Durante los años sesenta, el proceso de gestación, aprobación y posterior integración de esta nueva figura en la pirámide académica no escapó a la controversia, dando lugar a un fenómeno complejo al que, sin embargo, no se han dedicado estudios exhaustivos que revelen cómo, cuándo, por qué y bajo qué condiciones apareció este docente en la universidad española del franquismo. El presente trabajo pretende aportar al lector una visión general sobre el proceso de concreción de la figura del agregado, el marco normativo que definitivamente estableció esta nueva categoría docente así como las disposiciones que se encargaron de regular los procesos de concurso-oposición. Asimismo, se analizarán las primeras dotaciones de agregados aprobadas y la distribución de las mismas por universidades, facultades y estudios. Para terminar, se realiza un primer acercamiento a las posibles motivaciones que condujeron a la creación de esta nueva figura docente en una universidad aquejada de graves problemas que esperaban a una solución que venía demorándose sine die.

  2. La teoría del valor agregado: una aproximación a la calidad de la educación en Colombia.

    Directory of Open Access Journals (Sweden)

    Luis Fernando Gamboa

    2010-05-01

    Full Text Available Este artículo presenta nuevas formas de abordar los resultados de estudiantes y colegios en los exámenes de estado del ICFES. Reconociendo las críticas recibidas por diferentes publicaciones, en donde se comparan los colegios de acuerdo a su puntaje promedio, se propone un análisis de valor agregado, el cual tiene en cuenta estrictamente las diferencias en el contexto socioeconómico de los estudiantes y sus familias, para abordar de manera más equitativa los resultados académicos. Se muestra la bondad de esta técnica para efectos del diagnóstico y diseño de estrategias de mejoramiento tanto entre los colegios como al interior de ellos, al poder explorar los resultados de cada uno de sus estudiantes.

  3. Preparación de agregados orientados de arcilla mediante extensor

    OpenAIRE

    Plana, F.; Traveria i Cros, Adolf; Martínez Manent, Salvador

    1982-01-01

    Se detalla un método nuevo para la preparación de agregados orientados de arcilla para sus análisis por Difracción de Rayos X. Se trata de emplear un extensor para obtener un grosor constante de material, que por su delgadez seca rápidamente, economizándose tiempo y espacio en el laboratorio, obteniéndose además mejores resultados que con el método convencional.

  4. Valor econômico agregado (VEA e estrutura de capital em empresas do IBRX 100

    Directory of Open Access Journals (Sweden)

    Rodrigo Angonese

    2011-12-01

    Full Text Available Parte-se da premissa que a escolha da estrutura de capital da empresa interfere diretamente na geração de valor. Sendo assim, esta pesquisa objetivou averiguar se existe relação positiva e significativa entre o endividamento e o valor econômico agregado. A hipótese de pesquisa envolve o relacionamento entre três fatores considerados como potenciais explicativos do nível de endividamento: o tamanho da empresa, a rentabilidade e o valor econômico agregado. A amostra selecionada para a pesquisa foi composta pelas empresas que compõem o índice IBRx 100 da Bolsa de Valores Mercadorias e Futuros, com exceção das instituições financeiras. Os dados foram obtidos a partir das demonstrações contábeis encerradas em 31/12/2009. A pesquisa pode ser classificada, quanto aos objetivos, como descritiva, e, quanto aos procedimentos, como documental e com abordagem quantitativa para o problema. Os resultados da análise de regressão linear pelo método dos mínimos quadrados ordinários (MQO não encontrou uma relação significativa entre as variáveis endividamento e geração do valor agregado. Apenas a variável tamanho confirmou-se como um dos determinantes do endividamento das empresas selecionadas na amostra.

  5. Medidas de adesão entre agregado e ligante asfáltico

    Directory of Open Access Journals (Sweden)

    Kamilla Lima Vasconcelos

    2009-06-01

    Full Text Available

    A adesão entre agregado e ligante asfáltico vem sendo apontada como uma propriedade de grande importância para a causa de defeitos encontrados em pavimentos asfálticos, tais como trincas por fadiga, e dano por umidade. Diferentes mecanismos existem na literatura para explicar a adesão entre os dois materiais, porém, estes mecanismos podem ser resumidos em três grandes grupos: inter- travamento mecânico, adesão física, e interação química. A ocorrência de mais de um mecanismo simultaneamente parece ser o fenô- meno mais provável, sendo a relevância de cada um dependente das características físicas e químicas do agregado e do ligante asfálti- co. No presente trabalho, dois procedimentos foram utilizados para acessar a adesão entre agregado e ligante. O primeiro constou do cálculo do trabalho de adesão através da energia livre de superfície dos materiais envolvidos e o segundo, da determinação da entalpia de imersão quando soluções de asfalto são postas em contato com o agregado. Todos os materiais usados foram provenientes da biblio- teca de referência do SHRP sendo um pedregulho como agregado, e três diferentes ligantes asfálticos. Os resultados mostraram a capa- cidade do microcalorímetro em detectar possíveis interações químicas na adesão entre agregado e ligante asfáltico, em conjunto com adesão física. A presença de grupos funcionais mais fortemente adsorvidos pela superfície dos agregados justificou os maiores valores de entalpia de imersão para as combinações onde esses grupos se encontravam presentes.

    Abstract Adhesion between the asphalt binder and the aggregate is critical to the performance and durability of asphalt mixtures. According to the literature, distresses mechanisms such as fatigue cracking and moisture induced damage are correlated to the nature and quality of adhesion between these two materials. Different mechanisms already exist to explain

  6. Estabilidad estructural y P en fracciones de agregados en la cuenca del Aº El Divisorio (Coronel Pringles, BA Structural stability and phosphorus in soil aggregate fractions in El Divisorio stream catchment area (Coronel Pringles, Buenos Aires province

    Directory of Open Access Journals (Sweden)

    Josefina Cacchiarelli

    2008-07-01

    Full Text Available En los últimos años la calidad del agua en el embalse Paso de las Piedras se ha visto afectada por la eutrofización, perjudicando la provisión para la población de Bahía Blanca y alrededores. Se ha señalado a la actividad agropecuaria como originaria del aumento de la concentración de fósforo (P en el arroyo El Divisorio, que desemboca en el embalse. El objetivo de este estudio fue cuantificar las relaciones entre algunas propiedades relacionadas con el potencial de contaminación de estos suelos: la estabilidad estructural, la distribución de tamaños de agregados y las concentraciones de las formas de P en los diferentes agregados. Se seleccionaron 16 transectas en lotes de productores a lo largo del curso del arroyo. Se tomaron muestras de suelo (0-5 cm en las posiciones loma (L, media loma (M y bajo (B. Se determinaron los diámetros medios ponderado en seco (DMPs y en húmedo (DMPh, calculándose el cambio en el diámetro medio ponderado (CDMP. Se determinaron los contenidos de P orgánico (Po e inorgánico (Pi en cada una de las posiciones y tamaños de agregados. Si bien los suelos de la cuenca mostraron buenos valores de estabilidad estructural, las fuerzas físicas provenientes de la actividad agrícola favorecieron la destrucción de los agregados menos estables encontrándose gran cantidad de material fino (In the last years, water quality in the Paso de las Piedras reservoir has been affected by eutrophication, leading to problems in the provision of potable water to the population of Bahía Blanca city and surrounding areas. Agricultural activity has been pointed out as the possible non-point source of P contaminating the El Divisorio stream, which flows directly into the reservoir. The objective of this work was to assess some selected edaphic properties associated with the contamination potential of soils such as structural stability, aggregate distribution and concentration of organic (Po and inorganic (Pi P in the

  7. Avaliação do uso de agregados miúdos reciclados de concreto em concretos betuminosos usinados a quente

    OpenAIRE

    Lobo, Adriana Verchai de Lima

    2013-01-01

    Resumo: O futuro da pavimentação inevitavelmente envolverá o uso de materiais reciclados. Esta tendência de sustentabilidade é devido ao impacto ambiental positivo que agregados reciclados têm quando utilizados em pavimentação devido à grande demanda de agregados para este tipo de construção. Os agregados reciclados podem ser utilizados em misturas asfálticas como revestimento ou em bases e subbases. O objetivo desta pesquisa é avaliar o uso do agregado reciclado de concreto miúdo (ARCm) em C...

  8. Una nueva categoría docente en la universidad española del franquismo: la aparición en escena del profesor agregado

    OpenAIRE

    González Gómez, Sara

    2016-01-01

    La Ley sobre estructura de las facultades universitarias y su profesorado aprobada el 17 de julio de 1965 colocó la figura del profesor agregado sobre el escenario universitario. Durante los años sesenta, el proceso de gestación, aprobación y posterior integración de esta nueva figura en la pirámide académica no escapó a la controversia, dando lugar a un fenómeno complejo al que, sin embargo, no se han dedicado estudios exhaustivos que revelen cómo, cuándo, por qué y bajo qué condiciones apar...

  9. La valuación de empresas en México. Aplicación del modelo de Valor Económico Agregado: 1991-2000

    OpenAIRE

    María Luisa Saavedra García

    2004-01-01

    El objetivo de este artículo es mostrar la aplicación del modelo de Valor Económico Agregado en las empresas que cotizan en la Bolsa Mexicana de Valores con el fin de determinar su valor y buscar si existe algún patrón de comportamiento del modelo al valuar a este conjunto de empresas por un período de 10 años (1991 a 2000). En esta investigación se propuso y se aplicó una metodología para la determinación del valor en empresas mexicanas que cotizan en la Bolsa Mexicana de Valo...

  10. Isótopos estables aplicados al estudio de los sistemas paleoagrícolas mediterráneos

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    J.P. Ferrio

    2006-01-01

    gran interés de cara a conocer sus causas potenciales, así como para comprender los efectos a largo plazo de la economía agrícola sobre el ambiente. En este trabajo presentamos la metodología desarrollada por nuestro equipo para reconstruir las condiciones climáticas y de cultivo en la agricultura primitiva, basada en el análisis de la composición isotópica de carbono (enriquecimiento en 13C y nitrógeno (enriquecimiento en 15N en restos vegetales recuperados de yacimientos arqueológicos. El análisis de 13C en cariópsides de cereales carbonizadas ha permitido cuantificar la disponibilidad hídrica de los cultivos en diversos yacimientos de la Península Ibérica y el Creciente Fértil, así como estimar su rendimiento en el pasado, mientras que el análisis de 15N, nos aporta información cualitativa sobre las condiciones nutricionales. Por otro lado, el análisis de 13C en restos forestales (carbones ha permitido cuantificar las condiciones climáticas (precipitación y déficit hídrico en los mismos yacimientos, aportando así información sobre el marco climático en el que se desarrollaron los cultivos.

  11. Agregado reciclado empregado na produção de concreto modificado com aditivo

    OpenAIRE

    Márcio Joaquim Estefano de Oliveira

    2006-01-01

    O emprego de agregado reciclado de resíduo de concreto e de rejeitos cerâmicos se apresenta como alternativa promissora para a fabricação de componentes e elementos de construção civil, com a finalidade de atender às questões técnicas, econômicas, sociais e ambientais. A matéria-prima empregada na pesquisa foi o resíduo de concreto descartado pelas obras de construção civil que, muitas vezes, contém restos de materiais cerâmicos provenientes de blocos e azulejos, com idad...

  12. IDENTIFICACIÓN DE FUENTE Y ZONAS DE RECARGA A UN SISTEMA ACUIFERO APARTIR DE ISÓTOPOS ESTABLES DEL AGUA CASO DE ESTUDIO BAJO CAUCA ANTIOQUEÑO

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    Palacio B. Paola Andrea

    2008-07-01

    Full Text Available La hidrología isotópica y la hidrogeoquímica constituyen técnicas auxiliares avanzadas para la validación de modelos hidrogeológicos conceptuales. Los isótopos estables de la molécula de agua constituyen trazadores que permiten identificar fuentes de recarga y trayectoria del recurso dentro del acuífero, en tanto que el tritio permite evaluar tiempo de residencia. En este articulo se presentan los resultados de un estudio mediante el cual se utilizaron los isótopos 18O,2H y 3H para determinar fuentes y zonas de recarga al sistema acuífero del Bajo Cauca antioqueño

  13. Propriedades de concretos betuminosos usinados a quente com o uso de agregado graúdo reciclado de concreto

    OpenAIRE

    Motter, Janaína Setin

    2013-01-01

    Resumo: Considere a seguinte questão: por que usar em via de tráfego local, materiais pétreos, se os mesmos podem ser substituídos por agregados alternativos que possibilitam ao concreto betuminoso usinado a quente características suficientes para atender aos requisitos exigidos? A quantidade de resíduos de construção gerados anualmente no Brasil é estimada em 500kg/hab.ano (Pinto, 1999) e supera o uso do material nas práticas já consolidadas, como a utilização de agregados reciclados em base...

  14. Distribuição dos agregados e carbono orgânico influenciados por manejos agroecológicos.

    OpenAIRE

    Loss, Arcângelo; Pereira, Marcos Gervasio; Schultz, Nivaldo; Ferreira, Edilene Pereira; Silva, Eliane Maria Ribeiro da; Beutler, Sidinei Julio

    2009-01-01

    O objetivo deste estudo foi verificar a influência do manejo agroecológico na distribuição dos agregados estáveis em água e no teor de carbono orgânico dos agregados em diferentes coberturas vegetais. Foram selecionadas cinco áreas, a saber: sistema agroflorestal; cultivo de figo (Ficus carica L.); consórcio maracujá (Passiflora edulis S.)–Desmodium sp.; cultivo de feijão (Phaseolus vulgaris L.), em manejo convencional, e cultivo de milho (Zea mays L.), em plantio direto. Em cada área, foram ...

  15. La situación legal de los trabajadores inmigrantes estables y temporeros en España

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    Francisco Sacristán Romero

    2006-03-01

    Full Text Available Este texto analiza las políticas de empleo para los trabajadores extranjeros en España, los de situación estable y los de tipo temporal. Se fija especialmente en el marco legal vigente, español y comunitario, y aporta los análisis críticos de otras perspectivas, como por ejemplo los sindicatos. Los datos demuestran que los flujos de inmigrantes tienen una creciente importancia en muchos sectores de la economía y, por tanto, la legislación debe actualizarse y abrir los ojos a la realidad para acabar con las irregularidades y mejorar las condiciones contractuales de los trabajadores inmigrantes.

  16. Juan Rulfo: Antropología de la Memoria y el estable paisaje de la muerte

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    Ethel Junco de Calabrese

    2014-11-01

    Full Text Available Resumen La edificación de un mundo de ficción sobre un mundo real porta algo más que la mera descripción del último, implica, opuestamente, una propuesta de superación o al menos de diferenciación. En el caso de las obras de Rulfo, posibles de ser analizadas en sus connotaciones históricas, sociológicas, políticas, la propuesta del autor parece hablarnos de un estado anterior a toda construcción de comunidad y se refiere a su componente en estado puro, al hombre en su ineludible soledad frente al destino. Recorreremos en esta lectura la dimensión antropológica en busca de especificar qué constituye la realidad del hombre, tanto en el orden natural, tiempo y espacio, como en el sobrenatural, Dios mismo. En el cruce de la horizontal de tiempo y espacio con la vertical de lo divino, intentaremos ubicar al hombre y su destino, situados en el lugar inicial de la memoria. Juan Rulfo: Anthropology of Memory and stable landscape of death Abstract The construction of a fictional world over a real world bears more than a mere description of the latter; it implies, conversely, a proposal for an overcoming or, at least, for a differentiation. In the case of Rulfo´s works, iable to be analyzed in their historical, sociological, political connotations, the author's proposal seems to speak to us of a time before all state of building a community and relates to its component in a pure state, man in his inescapable loneliness against fate. This reading will visit the anthropological dimension in search of specifying what constitutes the reality of man, both in the natural order, time and space, and in the supernatural one, God himself. At the intersection of the horizontal of space and time with the vertical of the divine; we will try to locate man and his destiny in the original memory location.

  17. Resistência e elasticidade de concretos compactados com agregados reciclados de construção e de demolição para aplicações em pavimentação

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    Gino Ricci

    2010-04-01

    Full Text Available O emprego de agregados reciclados de resíduos sólidos da construção civil e demolição tem sido objeto de interesse de agentes públicos engajados em projetos e obras de pavimentação viária. A coleta, triagem e classificação desses materiais como agregados alternativos torna ainda possível seu emprego em concretos para algumas finalidades, sendo que no caso do concreto compactado para fins de pavimentação ainda não se tem precedente de uso no país. Estudos sobre este material para pavimentação têm sido realizados, sendo aqui apresentados resultados relativos a características mecânicas fundamentais para a análise das potencialidades do material para bases de pavimentos asfálticos e de concreto, ainda que para aplicações urbanas e em volumes limitados. Foram empregados nos estudos agregados reciclados de diferentes origens em substituição parcial ou total dos de agregados nos concretos. Os resultados obtidos permitem observar inexpressiva alteração em resistências com pequenos ajustes nos consumos de cimento. Todavia, concomitantemente ocorreu queda expressiva dos valores de módulo de elasticidade dos materiais na medida em que frações menos densas de agregados foram empregadas em maior quantidade e a parcela de substituição de agregados virgens por reciclados aumentou. As características observadas permitem a indicação do emprego do material para vias de baixo volume de tráfego além de áreas residenciais, condomínios, estacionamentos, etc. Por outro lado, o aumento da porosidade dos concretos em função da presença de reciclados exige atenção e estudos mais aprofundados sobre o comportamento à fratura e à fadiga desses materiais.

    Abstract: Along the last decades, recycled aggregate produced from waste material from civil construction activities gained growing interest for its employment in pavements. Appropriate collection, selection and sieving of such a material make

  18. ¿Es el EVA, realmente, un indicador del valor económico agregado? ¿Es el EVA, realmente, un indicador del valor económico agregado?

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    Hernán Herrera Echeverry

    2006-12-01

    Full Text Available In this article we analyze the relevance of EVA (Economic Value Added as a tool for measuring value added, as well as its usefulness as an indicator in choosing investment projects.  First, we show five ways of calculating EVA, providing examples of each case. Second, we show MVA (Market Value Added and NPV (Net Present Value to be equivalent as criteria used to evaluate investment projects.  This is done with both the limited term and the perpetual cases, as well as for projects with partial and total recovery of the investment.We present a thorough analysis, showing the possibilities and limitations of EVA as a value added measure.  We also introduce three measurements of residual income, CVA (Cash Value Added, Cash Flow Return on Investment (CFROI and Economic Profit (EP, which complement EVA in the value measurement process. Finally, we introduce an example that explicitly shows the equivalence between CVA’s present value, MVA and NPV.En este artículo se hace un análisis sobre la validez del EVA (Economic ValueAdded como una medida del valor generado, y de su utilidad para la evaluaciónde proyectos de inversión. Primero se muestran varias formas de calcular el EVA,haciendo ejercicios ilustrativos en cada caso, posteriormente se establece laequivalencia entre el MVA (Market Value Added y el VPN (valor presente netocomo criterios para la evaluación de proyectos de inversión finitos y perpetuos conrecuperación parcial y total de la inversión.Se realiza un examen crítico mostrando las limitaciones y posibilidades del EVAcomo medida de valor económico agregado, y se plantea la utilidad de indicadoresde ingreso residual para complementar al EVA como criterios de medición de valor,tales son el CVA (Cash Value Added, TRFC (tasa de retorno del flujo de caja yUtilidad Económica (UE. Finalmente, se hace un ejemplo en donde se explicitacómo el valor presente del CVA coincide con el MVA y el VPN.

  19. EPOC: Propuesta de manejo simple del paciente estable COPD: A PROPOSAL OF BASIC MANAGEMENT OF THE STABLE PATIENT

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    MÓNICA GUTIÉRREZ C.

    2002-07-01

    Full Text Available Considerando la frecuencia con que la EPOC estable debe ser enfrentada en el nivel primario, en esta exposición se propone en forma esquemática a través de texto y diagramas de flujo una secuencia simplificada para el diagnóstico, etapificación, evaluación funcional y tratamiento de esta condición en sus diversas etapas. Las recomendaciones se circunscriben a los métodos y procedimientos cuya eficacia tiene un respaldo adecuado en la experiencia clínica y en las publicaciones y que, además, son factibles de aplicar en nuestro medioConsidering that COPD usually seen and frequently managed at the primary level this proposal schematically summarizes through text and diagrams a simplified sequence for the diagnosis, staging, functional evaluation and treatment of this condition in its different stages. Recommendations are cicumscribed to the methods and procedures whose efficiency is adequately backed by clinical experience and publications and which can be feasibly applied in our medium

  20. La posició del cònjuge i del convivent en parella estable supervivent en el Dret civil de Catalunya

    OpenAIRE

    Miralles Bellmunt, Miquel

    2016-01-01

    En aquesta tesi doctoral s’analitza la normativa que determina la posició del cònjuge i del convivent en parella estable supervivent, quan es dissol el matrimoni regit pel règim econòmic matrimonial de separació de béns o l’extinció de la parella estable a la qual se li aplica el Dret civil de Catalunya, amb motiu del traspàs de l’altre cònjuge o convivent, amb veïnatge civil català. La conclusió a què s’arriba és que la posició del cònjuge vidu ha anat millorant des de la reforma de l...

  1. Caracterización de mezclas semidensas con agregados de la región de Tunja

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    Carlos Hernando Higuera Sandoval

    2014-01-01

    Full Text Available Esta investigación determinó la viabilidad de las Mezclas Semidensas en Caliente, o Gap Graded, para el uso en vías de tránsito medio, como una alternativa a la capa asfáltica y a la base asfáltica. Para elaborar las mezclas se utilizaron agregados de dos canteras de la Provincia Centro del departamento de Boyacá: la recebera Piedra Gorda y la cantera La Calera, junto con el ligante bituminoso de penetración 60/70, proveniente de IncoAsfaltos S.A., empresa localizada en Mosquera (Cundinamarca. El diseño de las mezclas se realizó por medio de las metodologías Marshall y Ramcodes. La determinación de los módulos dinámicos de las mezclas se llevó a cabo por medio del equipo Nottingham Asphalt Tester (NAT. Los resultados mostraron valores de módulos mayores para las mezclas realizadas con el agregado de Piedra Gorda. Se diseñó la estructura de pavimento con agregados de La Calera, por cumplir con todas las especificaciones.

  2. Planejamento agregado da produção: modelagem e solução via planilha Excel & Solver

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    Oscar Salviano Silva Filho

    2009-07-01

    Full Text Available Este trabalho apresenta um aplicativo de apoio à tomada de decisão gerencial, baseado em planilha eletrônica e orientado à modelagem e solução de um problema de planejamento agregado da produção. Inicialmente, o problema a ser tratado é localizado dentro de um processo hierárquico de produção composto por três níveis de decisão. Em seguida é formulado um modelo matemático para representá-lo, o qual é baseado em programação linear. Este modelo possibilita a geração de planos agregados que podem ser utilizados pelo usuário na elaboração de cenários de produção. Por fim, um aplicativo interativo é proposto, onde se considera o uso da planilha Excel para entrada e saída de dados e o suplemento Solver como ferramenta de solução do modelo. As principais características deste aplicativo, no que diz respeito à formulação do problema de planejamento agregado, ao uso de interfaces gráficas para entrada e saída de dados e ao processo de decisão baseado em cenários, são discutidas e ilustradas através de um exemplo da literatura.

  3. Factibilidad de mezclas asfálticas de alto módulo con agregados del área de influencia de Tunja

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    Carlos Hernando Higuera Sandoval

    2013-12-01

    Full Text Available Se presentan los resultados del análisis de factibilidad de mezclas asfálticas de alto módulo (MAM con agregados pétreos provenientes de dos canteras del área de influencia de Tunja y asfalto modificado con polímeros tipo V. Las metodologías de diseño empleadas para determinar la fórmula de trabajo fueron Marshall y Ramcodes; el módulo dinámico de las respectivas mezclas se determinó por medio del ensayo de tracción indirecta en el equipo Nottingham Asphalt Tester – NAT–. Los resultados mostraron que las mezclas diseñadas tienen altos valores de flujo, lo que indica que se deforman fácilmente, y presentan valores de estabilidad superiores a las mezclas asfálticas convencionales; en cuanto al módulo dinámico, ninguna mezcla supera los 10.000 MPa a 20 ºC que exigen las especificaciones del INVIAS y del IDU; sin embargo, tomando como referencia la temperatura media anual ponderada de Tunja (13 ºC, una de las mezclas alcanza 11.000 MPa.

  4. O casamento putativo e seu papel perante a proteção das relações jurídicas do agregado social - Cônjuges, filhos e terceiros

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    Karina Almeida do Amaral

    2014-12-01

    Full Text Available O presente trabalho tem por objetivo examinar o instituto jurídico do casamento putativo, tendo por base o ordenamento português. Nesse sentido, trata-se da evolução do casamento perante a sociedade e a sua constituição enquanto contrato. Além disso, analisam-se os principais aspetos desse instrumento, quais sejam, os fundamentos de existência, os efeitos em relação ao agregado social, o que inclui cônjuges, filhos e terceiros, assim como pretende-se traçar uma ideia da relação jurídica considerando-se não apenas o espaço familiar fechado mas, também, o convívio em sociedade.

  5. ARGAMASSA COM SUBSTITUIÇÃO DE AGREGADO NATURAL POR RESÍDUO DE BRITAGEM DE GRANITO

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    Robson Arruda dos Santos

    2012-10-01

    Full Text Available A indústria da construção civil consome muitos recursos naturais e é grande geradora de resíduos. Há uma grande problemática relacionada com o tratamento destes, sendo uma alternativa a sua reutilização como substituto de materiais naturais, por exemplo, na produção de argamassas e de concreto. Este trabalho tem como escopo estudar o reaproveitamento dos resíduos da britagem de granito como agregado em argamassa. Os resíduos foram ensaiados de acordo com as normas da ABNT para agregado miúdo utilizados na construção civil. Foram determinados dois traços com a substituição total da areia natural pelo resíduo em estudo e realizados ensaios de resistência nos corpos de prova, segundo a NBR 13279, bem como o estudo da influência do resíduo na aparência e no consumo de água. Constatou-se que a substituição refletiu positivamente na resistência à compressão e flexão da argamassa. Contudo, ressalta-se que para obter-se um agregado com bom desempenho é preciso classificar o material, sendo necessária a utilização de classificadores para se eliminar as frações mais finas e mais grossas possibilitando às suas aplicações um desempenho aceitável.

  6. Técnica para o estudo da estabilidade de agregados do solo Technique for studies of stability of soil aggregates

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    F. Grohmann

    1960-01-01

    Full Text Available Os autores apresentam neste trabalho uma técnica para o estudo da estabilidade de agregados do solo. Vários tipos de solo sob diferentes condições de uso foram estudados. Amostras em triplicato, de 25 g de agregados entre 7 e 4 mm, foram agitados em agitador modêlo Wagner, com 40 r.p.m., durante 1, 2, 4, 8, 16, 32, 64 e 128 minutos e depois fracionadas pelo método da peneiragem lenta em água. Os agregados > 2 mm diminuíram em pêso com o aumento do tempo de agitação, aumentando por outro lodo os agregados 2 e This paper presents a technique for studies of stability of soil aggregates. The major soils of the State of São Paulo in different conditions of use have been examined. Triplicate samples of 25 g of soil aggregates of 7-4 mm size for each soil were shaken in a Model Wagner shaker at 40 rpm during 1, 2, 4, 8, 16, 32, 64 and 128 minutes period and were later fractioned by the wet sieving method. In general soil aggregates greater than 2 mm decreased gradually in weight with increasing period of treatment: at the some time the small size particles ( 2 mm and < 0.2 mm gave the general information needed. In general the experimental error were homogeneous and of small magnitude in relation to the systematic differences existent. The functional relationship between the two variables (time and weight of size particles was calculated by orthogonal polynomials considering the log time scale. In general polynomials of second degree were sufficient for a good approach, but in some cases polynomials of third degree were necessary. The authors believe that for fertility studies the interval 1-32 minutes is sufficient to separate the differences in aggregabifity. In that interval for the soils considered a first degree polynomial is satisfactory. Intervals of confidence had been calculated for the polynomial Y = A + B'E'1. The values Ai, As, B'i, B's were respectively the inferior and superior limits of the respective interval. Separations

  7. Condición étnico-racial, género y movilidad social en Bogotá, Cali y el agregado de las trece áreas metropolitanas en Colombia: un análisis descriptivo y econométrico

    OpenAIRE

    Carlos Augusto Viáfara López; Alexander Estacio Moreno; Luisa María González Aguiar

    2010-01-01

    Este artículo se interesa en el análisis de la movilidad educativa intergeneracional para las clases medias negras en las ciudades de Bogotá, Cali y el agregado de las trece áreas metropolitanas. Para la estimación de la movilidad intergeneracional educativa, se recurre al método de tablas de movilidad, modelos de Markov de primer orden y matrices de transición de probabilidad. Los resultados muestran que las clases medias afrocolombianas enfrentan una mayor inmovilidad, frente a las clases m...

  8. Criterios para la determinación de la frecuencia de rotación mínima del motor en movimiento estable.

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    R. Pérez Gálvez

    2007-05-01

    Full Text Available En este trabajo, se define teóricamente la frecuencia de rotación mínima del motor de combustión interna de un vehículo en movimiento estable. El método emplea la ecuación adimensional del movimiento para encontrar el valor de velocidad que satisface la igualdad del factor dinámico con el coeficiente de resistencia del camino. La validación se realiza mediante la comparación con una base de datos obtenida experimentalmente. También se presenta la influencia de la frecuencia de rotación mínima en movimiento estable con respecto a las cualidades de explotación, en la elaboración de los ciclos teóricos de movimiento, y en la actualización de indicadores de la relación fuente energética – sistema de transmisión. Además, se muestra el comportamiento del Coeficiente de Efectividad del Trabajo del Automóvil (CETA respecto a la velocidad mínima estable.In this paper, the frequency of minimum rotation in stable movement is defined theoretically. This method uses the reduced movement equation to find the value of speed that satisfies the equality of the dynamic factor with the coefficient of road resistance. The validation was made by means of comparison with an experimental database. The influence of minimum rotation frequency in stable movement is presented, with respect to the operation qualities, in the elaboration of theoretical drive cycles, and the updating of indicators for engines and transmission systems. Furthermore, are represented the behavior of the Automobile Work Effectiveness Coefficient with respect to the minimal speed.

  9. Isótopos estables del carbono en restos óseos humanos de la región del canal Beagle, Isla Grande de Tierra del Fuego

    OpenAIRE

    Tessone, Augusto; Zangrando, Francisco Atilio; Valencio, Susana; Panarello, Héctor

    2003-01-01

    El objetivo de este trabajo es conocer las particularidades de la dieta de grupos cazadores-recolectores, que habitaron la región del canal Beagle durante el Holoceno medio y tardío, mediante el análisis de isótopos estables del carbono sobre el colágeno de sus restos óseos. Se dan a conocer los valores de la 8¹³C obtenidos en cinco individuos. Seis determinaciones efectuadas previamente por otros autores en la misma región señalaron una variación mayor que la esperada en base a la informació...

  10. Isótopos estables, análisis arqueofaunísticos y entierros humanos en la costa centro-norte de Patagonia

    OpenAIRE

    Gómez Otero, Julieta

    2001-01-01

    Investigaciones arqueológicas realizadas en la costa centro-norte de Patagonia demostraron la presencia humana desde el 4370 A.P. Entre los diversos estudios, se realizaron análisis de isótopos estables a doce esqueletos humanos datados, de los cuáles diez se hallaron en esa porción de la costa atlántica. Si bien los resultados indican una alta variabilidad intersitio y ausencia de tendencias temporales, también señalan que los recursos terrestres, en especial guanacos, otros animales y plant...

  11. Plataformas de expresión en plantas de péptidos humanos terapéuticos: expresión transitoria y estable

    Directory of Open Access Journals (Sweden)

    Arnaldo Noguera

    2013-08-01

    Full Text Available Las plantas representan un sistema de expresión alternativo para la producción de proteínas heterólogas complejas tales como vacunas, antígenos, anticuerpos, eritroproyetina e insulina humana. Este sistema posee diversas ventajas sobre los sistemas de expresión tradicional basados en el cultivo de células de bacterias, levaduras, insectos y mamíferos, como su bajo costo de producción, menor tiempo para alcanzar la producción a gran escala, expresión, modificación y ensamblaje apropiado de la proteína recombinante y ausencia de riesgo de contaminación con patógenos humanos. En la última década la ingeniería genética de plantas ha utilizado ampliamente los sistemas de expresión estable basados en la bacteria Agrobacterium tumefaciens y la expresión transitoria basada en los vectores virales de plantas para la obtención de compuestos beneficiosos para la salud y el bienestar del hombre. La introducción de estos elementos virales en los sistemas de producción de proteínas recombinantes ha simplificado la manipulación y el proceso de infección de las plantas con el gen quimérico. Aunado a esto, el entendimiento de la inmunogenicidad que poseen los glicanos de origen vegetal sobre la actividad de los péptidos heterólogos, ha permitido dilucidar cuales son las vías moleculares más convenientes para expresar, ensamblar, compartamentalizar e incrementar la acumulación de las proteínas de interés. Con la presente revisión se busca proporcionar al lector una información detallada acerca de las estrategias de expresión heterólogas que utilizan sistemas vegetales, los principales agentes terapéuticos desarrollados basados en estos sistemas y la importancia biológica de las modificaciones post–traduccionales de los péptidos recombinantes. In plant expression platforms of therapeutic human peptides: transient and stable expression Abstract Plants represent an alternative expression system for the production of

  12. Índice de especulação de valor agregado: IEVA

    Directory of Open Access Journals (Sweden)

    José Roberto Kassai

    2002-12-01

    Full Text Available Por meio deste artigo propõe-se a criação de um modelo de análise de balanços denominado de Índice de Especulação de Valor Agregado (IEVA, estabelecido com base em uma formulação matemática que envolve conceitos relacionados com a riqueza econômica de um empreendimento, tais como economic value added (EVA, market value added (MVA, weighted average cost of capital (WACC. Comparativamente a um outro modelo já existente na literatura: o Tobin's Q, contribui com novas análises; permite identificar o nível de especulação atribuído ao valor de uma empresa (market value, estabelecido em função do mercado de capitais (stock prices e, de acordo com a análise proposta dos quadrantes do IEVA, evidencia o ciclo de vida das empresas. Mostra, por exemplo, como o valor das empresas que têm suas ações negociadas na The National Association of Securities Dealer Automated Quotation (NASDAQ estaria "superestimado".This article proposes the creation of a balance sheet analysis model called Speculation Index of Value Added (IEVA, which is established on the basis of a mathematical formulation involving concepts related to the economic wealth of an enterprise, such as economic value added (EVA, market value added (MVA, weighted average cost of capital (WACC. In comparison with another model that already exists in literature, that is, Tobin's Q, this model contributes by means of new analyses, makes it possible to identify the level of speculation attributed to a company's market value, which is established in function of stock prices and, in accordance with the proposed analysis of the IEVA quadrants, discloses the company's life cycle. The model shows, for example, how the market value of companies whose stocks are traded in The National Association of Securities Dealer Automated Quotation (NASDAQ would be "overestimated".

  13. Evaluación de la carbonatación de concreto modificado con polímero, utilizando agregado grueso y tereftalato de polietileno reciclados

    OpenAIRE

    Mendivil Escalante, José M.; Gómez Soberón, José Manuel Vicente; Castro Beltrán, Andrés; Corral Higuera, Ramón; Arredondo Rea, Susana Paola; Almaral Sánchez, Jorge Luis

    2015-01-01

    En este trabajo de investigación se han estudiado diferentes mezclas de concreto modificado con polímero, constituidas por agregado natural (AN) y un remplazo parcial de agregado grueso de concreto reciclado (AGR) del 25 %, con la adición de 9, 13 y 17% de resina polimérica sintetizada a partir de botellas de tereftalato de polietileno (PET por sus siglas en inglés) post-consumo a través de procesos de reciclaje mecánico y químico. Las probetas de concreto fabricadas fueron expuestas en una c...

  14. Propiedades químicas de concreto modificado con polímero, a partir de agregados pétreos y tereftalato de polietileno (PET) reciclados

    OpenAIRE

    Mendivil Escalante, José M.; Almaral Sánchez, Jorge Luis; Sepúlveda Guzmán, S.; Arredondo Rea, Susana Paola; Corral Higuera, Ramón; Gómez Soberón, José Manuel Vicente

    2012-01-01

    Se propone el uso de agregados pétreos y tereftalato de polietileno (PET) reciclados en la preparación de concretos, permitiendo mejores propiedades químicas y durabilidad. Se plantea elaborar concretos con un remplazo parcial de agregado proveniente de concreto reciclado (CR). A su vez se incorpora una resina procedente de botellas de PET, implementando el reciclaje químico para su elaboración. Se caracterizó la reina, tanto de PET reciclado, como de reactivos vírgenes por Espectroscopia FT-...

  15. Ventajas del mineral trióxido agregado y del hidróxido de calcio frente a patologías pulpares de tipo degenerativo

    Directory of Open Access Journals (Sweden)

    Edison Gabriel Quintero Ricardo

    2014-06-01

    Full Text Available ResumenEl agregado de trióxido mineral (MTA es un material desarrollado para endodoncia. Las principales indicaciones del MTA, son el tratamiento pulpar en dientes vitales (pulpotomias, recubrimiento pulpar directo, apicoformaciones (barrera apical, cirugía endodóncica, reparación de perforaciones furcales, laterales y las provocadas por las reabsorciones. El MTA favorece la formación de hueso y cemento, y puede facilitar la regeneración del ligamento periodontal sin provocar inflamación; como un coadyuvante del MTA en los procesos de reparación tenemos el hidróxido de calcio que es un potente agente bacteriostático y bactericida que se utiliza para el control de microorganismos cuando es empleado como medicamento intraconducto, igualmente actúa como agente catalizador en la modificación del pH en los tejidos periapicales con el fin de favorecer el proceso de cicatrización, presenta excelentes propiedades higroscópica en cuanto al control del exudado en conductos radiculares de dientes con lesiones periapicales grandes los cuales muchas veces presentan humedad persistente en los canales radiculares asimismo actúa en la prevención o detención de procesos resortivos ejerciendo efectos moduladores en la actividad clástica. Por tales propiedades el artículo tiene como fin mostrar los efectos a corto plazo que ocurren en una reabsorción interna y lesión apical al momento de utilizar mineral trióxido agregado (MTA e hidróxido de calcio como material intracanal. (Duazary 2009-II 141-146AbstractMineral trioxide aggregate (MTA is a new material developed for endodontics. The principal indications of MTA are vital pulp therapy (pulpotomy, direct pulp capping, apexification (apical plug, endodontic surgery, and lateral, furcal and resorption perforations repair. The MTA induce the formation of cementum and bone, and it may facilitate the regeneration of the periodontal ligament without causing any inflammation; as a helping of the

  16. Aplicaciones del modelo On/Of f al tráfico agregado en las redes de comunicaciones

    Directory of Open Access Journals (Sweden)

    Andrés Parra León

    2011-12-01

    Full Text Available The models to recreate traf c traces generated in a communications network can be used in predictions and estimates of traffic in order to optimize the use of network resources, one of these is the model On/Off, which allows describing the behavior of aggregate traf c by one or more sources of information. The importance of this article focuses on the impact that this model has been applied to various communications technologies, for this are evaluated and contrasted different types of documents proposed by several authors. Basedon the results, arguably Models On/Off are still in place for traf c modeling, and can be applied at any level of ISO/OSI model. Also, the results observed indicate that depending on the type of power On/Off (single or multiple the approaches vary greatly, and the mathematical complexity that can have models with source multiplexing On/Off could be a constraint to take into account in its implementation.

  17. Desempenho de concretos com agregados reciclados de cerâmica vermelha Performance of red ceramic recycled aggregate concrete

    OpenAIRE

    A. E. B. Cabral; V. Schalch; Dal Molin, D. C. C.; J. L. D. Ribeiro; Rasiah Sri Ravindrarajah

    2009-01-01

    Os resíduos de construção e demolição (RCD) constituem uma importante parcela dos resíduos sólidos produzidos nas cidades brasileiras, correspondendo em torno de 50% dos resíduos sólidos urbanos. Dentre os diversos constituintes do RCD, a cerâmica vermelha, proveniente de restos de tijolos e telhas cerâmicas utilizados nas construções, equivale a uma considerável parcela destes resíduos. A reciclagem do RCD para a produção de agregados reciclados tem se tornado uma prática cada vez mais comum...

  18. El proceso democrático actual se aleja más de la democracia ideal: una propuesta de su reorientación hacia una paz social más estable

    Directory of Open Access Journals (Sweden)

    José Ricardo Perfecto Sánchez

    2009-01-01

    Full Text Available Después de un largo periodo de gobierno federal en manos de representantes del Partido Revolucionario Institucional (PRI, a fines del año 2000 asumió el poder federal de la Presidencia, Vicente Fox Quesada, miembro del Partido Acción Nacional (PAN, seguido en 2006 por el actual presidente del mismo partido político Felipe Calderón Hinojosa. El pueblo de México optó en ambas ocasiones por el cambio no tanto de partido político sino más bien del modo de ejercer el poder, tras la búsqueda de mejores condiciones de calidad de vida en todos sus aspectos. La experiencia vivida por los mexicanos nos muestra que esto no ha sido suficiente, pues, aunque el "presidencialismo" pareciera haber quedado atrás, los hechos muestran que transitamos por un camino de un "tira y afloja" de una especie de "camarismo", con el riesgo de alejarnos más de un proceso real de democracia. Para ello, es necesario recordar el por qué de los orígenes de la división del poder gubernamental, en poder ejecutivo, legislativo y judicial. Mas, para que esta división pueda funcionar con más eficiencia y eficacia, se requieren, a mi parecer, tres condiciones de posibilidad, estrechamente vinculadas entre sí, a saber, límites y alcances de la democracia, de la libertad y del valor social de corresponsabilidad. De donde infiero que, sí y sólo si ejercemos nuestra libertad con responsabilidad en un contexto democrático equitativo, podríamos corresponsablemente construir o reconstruir una sociedad más estable y segura, que nos permitiría vivir en paz o al menos con menos violencia.

  19. Criterios para la determinación de la frecuencia de rotación mínima del motor en movimiento estable.

    OpenAIRE

    R. Pérez Gálvez; J. R. Fuentes Vega; J. B. Cogollos Martínez

    2007-01-01

    En este trabajo, se define teóricamente la frecuencia de rotación mínima del motor de combustión interna de un vehículo en movimiento estable. El método emplea la ecuación adimensional del movimiento para encontrar el valor de velocidad que satisface la igualdad del factor dinámico con el coeficiente de resistencia del camino. La validación se realiza mediante la comparación con una base de datos obtenida experimentalmente. También se presenta la influencia de la frecuencia de rotación mínima...

  20. Caracterização microestrutural da argila expandida para aplicação como agregado em concreto estrutural leve Microstructural evaluation of expanded clay to be used as lightweight aggregate in structural concrete

    OpenAIRE

    W. G. Moravia; C.A.S. Oliveira; A. G. Gumieri; W. L. Vasconcelos

    2006-01-01

    A utilização da argila expandida como agregado graúdo é economicamente viável na fabricação de concretos devido à redução da massa especifica que estes agregados proporcionam, minimizando os carregamentos atuantes nas estruturas. O objetivo deste trabalho é caracterizar a microestrutura do agregado leve de argila expandida visando sua utilização na fabricação de concretos. Na caracterização física da argila expandida foram avaliadas a massa unitária, a granulometria e a absorção de água por i...

  1. Concreto translúcido transmisión de luz visible a través de morteros con fluorita como agregado fino

    OpenAIRE

    Hoyos Montilla, Ary Alain

    2012-01-01

    Esta investigación presenta los resultados y la evaluación de las propiedades ópticas que se le realizaron a morteros preparados con fluoruro de calcio como agregado. Inicialmente, se define la modelación matemática que permite formular la hipótesis acerca de cuál debe ser la variación del tamaño del agregado para mejorar la transmitancia de un haz de luz en el rango visible, a través de este material. Se utilizó fundamentalmente: fluorita y cemento pórtland tipo III gris y blanco y se midier...

  2. Morfologia de agregados do solo avaliada por meio de análise de imagens Morphology of soil aggregates evaluated by images analysis

    Directory of Open Access Journals (Sweden)

    N. Olszevski

    2004-10-01

    Full Text Available O uso intensivo do solo, aliado a condições inadequadas de manejo, concorre para a deterioração de suas propriedades físicas e isso se deve, principalmente, às modificações em sua estrutura. Uma vez que as mudanças estruturais influem diretamente na morfologia dos agregados, considera-se fundamental a procura de novos métodos de estudos macromorfológicos para permitir o acompanhamento das modificações dessa característica nos solos cultivados. Sendo assim, este trabalho teve por objetivo adaptar e testar um método digital de análise macromorfológica qualitativa de agregados, visando detectar modificações morfológicas causadas pela ação antrópica. Para tal estudo, foram escolhidos cinco sistemas de preparo do solo: plantio direto, escarificador, grade aradora, arado de discos e arado de aivecas. Realizou-se o estudo da forma e do tamanho das diferentes classes de agregados de um Latossolo Vermelho distrófico típico, em amostras coletadas em 1998, após a aquisição de imagens com o uso de um scanner (HP 6100C com capacidade de resolução ótica de 1.200 dpi e o posterior processamento dessas imagens pelo programa de computador denominado UTHSCSA Image Tool. Este programa fornece índices sobre os agregados, tais como: arredondamento, compacidade e alongamento. O índice arredondamento é dependente da medida de perímetro (rugosidade externa e os índices compacidade e alongamento são dependentes da medida do comprimento do maior eixo (arestas. De maneira geral, os sistemas de manejo utilizados por três anos consecutivos não promoveram diferenças morfológicas dos agregados do Latossolo Vermelho textura argilosa para as variáveis analisadas. A análise de imagens mostrou-se sensível à detecção de mudanças na morfologia dos agregados do solo, sendo bastante promissora como uma nova ferramenta nos estudos da estrutura do solo.The intensive soil use together with inadequate management practices contribute to the

  3. Modelo de prestación de servicios ITS de valor agregado: aplicación a los sistemas de gestión de aparcamiento

    OpenAIRE

    Herrera Quintero, Luis Felipe

    2011-01-01

    La presente tesis propone un modelo para la prestación de servicios de valor agregado en el ámbito de los Sistemas Inteligentes de Transporte (Intelligent Transportation Systems -ITS) dando solución a los problemas de integración, interoperabilidad, compatibilidad y escalabilidad provocados por la gran cantidad de tecnologías que componen el escenario de los ITS. Con el fin de integrar todos los elementos que componen los sistemas ITS, el modelo propuesto se basa en las Arquitecturas Orien...

  4. Measurement of soil aggregate stability using low intensity ultrasonic vibration Medición de la estabilidad de agregados de suelo utilizando vibración ultrasónica de baja intensidad Medição da estabilidade dos agregados do solo por vibração ultrasónica de baixa intensidade

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    Herwig Mayer

    2011-11-01

    del laboreo sobre la estabilidad de los agregados del suelo (soil aggregate stability – SAS utilizando un método de dispersión ultrasónica con diferentes niveles de energía. Se hicieron ensayos con un equipo de dispersión ultrasónica desarrollado en la Universidad de Ciencias de Recursos Naturales y de la Vida (Viena. Este equipo facilita la aplicación de amplitudes de baja vibración, de 0.5 µm, 2 µm y 5 µm. La potencia ultrasónica determinada por un método de balance de energía es de 0.7 W, 8.9 W y 22.3 W para cada amplitud. Se tomaron muestras de agregados de 2 000 a 250 µm, en tres tipos de suelo del este de Austria: un suelo del tipo Chernozem franco limoso degradado, un Cambisol franco arcilloso y un Cambisol franco arenoso, y sometidos a diferentes tipos de laboreo: laboreo convencional (CT – conventional tillage, laboreo con eliminación mecánica de malas hierbas y sin laboreo (NT – no tillage, con siembra intercalada en invierno. Los resultados de la estabilidad de los agregados del suelo obtenidos según la norma DIN (Deutsches Institut für Normung mostraron que la estabilidad disminuía en el siguiente orden: Cambisol franco arcilloso > Cambisol franco arenoso > Chernozem franco limoso. La influencia del tipo de laboreo se observó en el segundo y tercer tipo de los suelos mencionados. La dispersión ultrasónica por amplitudes de baja vibración mostró una estabilidad más alta en suelos del tipo Cambisol. Se observó una influencia significativa del tipo de laboreo sobre la estabilidad de los agregados del suelo (entre 1 y 1.7 J ml-1 en el Cambisol franco arcilloso y el Chernozem degradado, resultando una disminución de la estabilidad de los agregados en el orden siguiente: Cambisol NT > Cambisol CT > Chernozem NT > Chernozem CT. No se observaron diferencias en el Cambisol franco arenoso, porque el nivel de agregación de los macroagregados fue demasiado débil. Este trabajo destaca la importancia de cuantificar la energ

  5. Desarrollo de productos de alto valor agregado como estrategia exportadora para las pymes del sector agroindustrial de Boyacá. Desde la perspectiva de gestión de proyectos

    OpenAIRE

    Restrepo Salcedo, Alvaro

    2015-01-01

    La competitividad de las pymes y de cualquier negocio es el resultado de una gestión de proyectos bien estructurada y diseñada para la generación de valor agregado y el aumento de la cadena de valor en todos los procesos de la organización, por lo tanto el objeto de este artículo es identificar, conceptualizar y plasmar el valor agregado como estrategia clave para lograr aumentar la competitividad de la pequeña empresa de Boyacá que desee ingresar a los mercados internacionales, estimulando ...

  6. Distribuição dos agregados e carbono orgânico influenciados por manejos agroecológicos = Aggregate and organic carbon distribution influenced by agroecological handling

    OpenAIRE

    Arcângelo Loss; Marcos Gervasio Pereira; Nivaldo Schultz; Edilene Pereira Ferreira; Eliane Maria Ribeiro da Silva; Sidinei Julio Beutler

    2009-01-01

    O objetivo deste estudo foi verificar a influência do manejo agroecológico na distribuição dos agregados estáveis em água e no teor de carbono orgânico dos agregados em diferentes coberturas vegetais. Foram selecionadas cinco áreas, a saber: sistema agroflorestal; cultivo de figo (Ficus carica L.); consórcio maracujá (Passiflora edulis S.)–Desmodium sp.; cultivo de feijão (Phaseolus vulgaris L.), em manejo convencional, e cultivo de milho (Zeamays L.), em plantio direto. Em cada área, foram c...

  7. com agregado reciclado

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    Márcio Joaquim Estefano de Oliveira

    2006-01-01

    Full Text Available Civil construction works (including new constructions, demolitions and reforms produce a considerable amount of construction and demolition waste that is generally discharged in inadequate way. The disposal of detritus without criterion expose the environment and the human being to unnecessary risks, once these wastes are often thrown into rivers, on the roadsides or agricultural grounds, and its contaminating substances, such as bitumen, solvent, calcium sulphate and inks provoke great unbalance on the ecosystem. The use of recycled aggregate in pavements, blocks, in concrete without structural function and, more recently, in concrete with structural function are some options to minimize environmental impacts. Nowadays, the properties of the concrete made with recycled aggregate have been studied in order to allow safe utilization. One aspect that deserves attention is the adherence of this kind of concrete to steel. Specimens were produced with a partial substitution of the natural aggregate by the recycled aggregate and reinforced concrete, chosen as reference. The specimens have been submitted to direct traction tests to calculate the adherence tension according to Brazilian standards. Despite slight variations, the tests confirmed the possibility of using reinforced concrete produced with recycled aggregate in structures capable to support tensions higher than 25MPa].

  8. com agregados reciclados

    Directory of Open Access Journals (Sweden)

    Cecília Ogliari Schaefer

    2007-01-01

    Full Text Available Construction and demolition waste is constituted, in great part, by construction materials; however, it may contain dangerous substances, such as heavy metals. In order to reduce the CDW volume to be disposed in landfills, there is a certain tendency to manufacture it as recycled aggregates to be used in materials. Thus, it is indispensable to investigate the recycled aggregates verifying the possible risk of environmental contamination and the contaminants interference in its characteristics. In this study, mortars were produced using fractioned recycled aggregates. The mortars were cured for 28 days and then taken to tank test, according to NEN 7345. The results show that heavy metals are leached from mortars produced with recycled aggregates in high concentrations. In the period of 24h, the concentrations obtained were lower than the recommended limits by NBR 10004 (2004, but much higher than the limits defined by the European.

  9. Criterios para la determinación de la frecuencia de rotación mínima del motor en movimiento estable. // Approaches for the determination of minimum rpm of engine in stable movement.

    Directory of Open Access Journals (Sweden)

    R. Pérez Gálvez

    2007-05-01

    Full Text Available En este trabajo, se define teóricamente la frecuencia de rotación mínima del motor de combustión interna de un vehículo enmovimiento estable. El método emplea la ecuación adimensional del movimiento para encontrar el valor de velocidad quesatisface la igualdad del factor dinámico con el coeficiente de resistencia del camino. La validación se realiza mediante lacomparación con una base de datos obtenida experimentalmente. También se presenta la influencia de la frecuencia derotación mínima en movimiento estable con respecto a las cualidades de explotación, en la elaboración de los ciclosteóricos de movimiento, y en la actualización de indicadores de la relación fuente energética – sistema de transmisión.Además, se muestra el comportamiento del Coeficiente de Efectividad del Trabajo del Automóvil (CETA respecto a lavelocidad mínima estable.Palabras claves: Frecuencia de rotación, evaluación de vehículo, motor de combustión interna, velocidadmínima.___________________________________________________________________________Abstract:In this paper, the frequency of minimum rotation in stable movement is defined theoretically. This method uses thereduced movement equation to find the value of speed that satisfies the equality of the dynamic factor with thecoefficient of road resistance. The validation was made by means of comparison with an experimental database. Theinfluence of minimum rotation frequency in stable movement is presented, with respect to the operation qualities, inthe elaboration of theoretical drive cycles, and the updating of indicators for engines and transmission systems.Furthermore, are represented the behavior of the Automobile Work Effectiveness Coefficient with respect to theminimal speed.Key words: Engines, minimal speed, rotation frequency, vehicle evaluation.

  10. Reconstrucción directa de la dieta mediante análisis de isótopos estables del carbono y del nitrógeno en individuos del Paleolítico Medio y Superior Europeo

    OpenAIRE

    Salazar García, Domingo Carlos

    2012-01-01

    Para la reconstrucción de la dieta de individuos del Paleolítico Medio y Superior se utiliza habitualmente métodos indirectos como por ejemplo estudios arqueozoológicos. Actualmente existen técnicas biogeoquímicas capaces de investigar dichos aspectos directamente sobre los restos óseos de los individuos objeto de estudio: los homininos Paleolíticos. Realizando análisis de isótopos estables del carbono y del nitrógeno en colágeno óseo se puede averiguar si hubo conusmo re...

  11. Spatial variability of aggregate stability in latosols under sugarcane Variabilidade espacial da estabilidade de agregados em latossolos sob cultivo de cana-de-açúcar

    Directory of Open Access Journals (Sweden)

    Zigomar Menezes de Souza

    2009-04-01

    Full Text Available The spatial variability of soils under a same management system is differentiated, as expressed in the properties. The spatial variability of aggregate stability of a eutrophic Red Latosol (ERL and a dystrophic Red Latosol (DRL under sugarcane was characterized. Samples were collected in a regular 10 m grid, in the layers 0.0-0.2 and 0.2-0.4 m, with 100 points per area, and the following properties were determined: geometric mean diameter (GMD of aggregates, mean weight diameter (MWD of aggregates, percent of aggregates in the > 2.0 mm class and organic matter (OM content. The eutrophic Red Latosol (ERL had a higher aggregate stability thn the dystrophic Red Latosol (DRL, which may be attributed to the higher clay and OM content and the gibbsitic mineralogy of this soil class. The differentiated evolution of the studied Oxisols explains the wider range and lower variation coefficient and variability, for all properties studied in the eutrophic Red Latosol.Solos submetidos ao mesmo sistema de manejo manifestam variabilidade espacial diferenciada de seus atributos. A variabilidade espacial da estabilidade de agregados foi caracterizada em um Latossolo Vermelho distrófico e Latossolo Vermelho eutroférrico, sob cultivo de cana-de-açúcar. Foram realizadas amostragens de terra nos pontos de interseção de uma malha de 10 x 10 linhas, espaçadas de 10 m, totalizando 100 pontos de amostragem por área, coletadas nas camadas de 0,0-0,2 e 0,2-0,4 m de profundidade, para determinação de diâmetro médio geométrico (DMG, diâmetro médio ponderado (DMP, agregados na classe >2,0 mm e teor de matéria orgânica do solo. O Latossolo Vermelho eutroférrico apresenta maior estabilidade de agregados quando comparado com o Latossolo Vermelho distrófico, condizente com o maior teor de argila, matéria orgânica e mineralogia gibbsítica. A evolução diferenciada dos Latossolos estudados explica os maiores alcances, o menor coeficiente de variação (CV e

  12. El control de los agregados monetarios: lecciones y experiencias del caso venezolano reciente The control of monetary aggregates: lessons and experiences from the recent Venezuelan case

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    Leonardo V. Vera

    2009-04-01

    Full Text Available Este trabajo intenta exponer las dificultades que confronta la autoridad monetaria para ejercer algún grado de control sobre los agregados monetarios, y para ello evalúa la experiencia reciente de una economía abierta y dependiente de un recurso mineral exportable como Venezuela. El trabajo no sólo expone argumentos analíticos, sino además provee evidencia muy sencilla en demostración de que existen numerosas fuentes de endogeneidad de la base monetaria, del multiplicador y de otros agregados más amplios en la economía venezolana. Aunque el Banco Central en Venezuela no viene anunciando ni explicando públicamente la estrategia y el alcance de la política monetaria, el trabajo muestra que la autoridad monetaria se ha movido sigilosamente, en los últimos tiempos, hacia una estrategia de uso de las tasas marcadores de las operaciones de mercado abierto como variable operativa buscando un objetivo final de actividad económica.This work examines the difficulties and formidable challenges faced by monetary authorities to control the behavior of monetary aggregates in an open economy dependent of an exportable natural resource such as Venezuela. The work not only introduces analytical arguments but also provides some empirical evidence that shows the several sources of endogeneity in the monetary base, the multiplier and other wider monetary aggregates in Venezuela. Though the Central Bank currently does not announce a clear strategy and target for the practice of monetary policy, we argue that the monetary authority has recently moved towards a strategy of targeting short-term interest rates. Presumably, the use of the repo rate as a monetary policy instrument is tied to a final target of economic activity.

  13. Respuesta del cultivo de trigo al agregado de azufre en el sudeste bonaerense Wheat response to sulphur fertilization in the southeast bonaerense

    OpenAIRE

    Nahuel Ignacio Reussi Calvo; Hernán Eduardo Echeverría; Hernán Sainz Rozas

    2006-01-01

    La intensificación de la agricultura en los últimos años, en la Región Pampeana y en el sudeste bonaerense en particular, provocó una disminución de la disponibilidad de azufre (S) en los suelos. Frente a esta situación, se planteó como objetivo evaluar el efecto de la fertilización azufrada sobre el rendimiento y el contenido de proteína en grano de trigo (Triticum aestivum L.), como así también su interacción con nitrógeno (N). Además se evalúan algunas de las metodologías de diagnóstico de...

  14. Posibilidades de diseño con el concreto arquitectónico, utilizando agregado grueso de ladrillo triturado reciclado

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    Guarín Salinas, Joan Manuel

    2012-01-01

    La construcción en Colombia ha sido un detonador de crecimiento para las ciudades con un carácter multifocal; positivo en cuanto al desarrollo físico, social, económico, tecnológico y cultural, y negativo frente al medio ambiente dada la creciente contaminación generada por los residuos de dicha industria que comprometen los recursos de los ecosistemas. Siendo la industria del concreto, el escenario donde la demanda de la construcción en Colombia se aplica, y el ladrillo, uno de los materiale...

  15. Contribución al modelado y caracterización de nodos en redes de banda ancha. Aplicación al multiplexor inverso ATM.

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    Aguilar Igartua, Mónica

    2000-01-01

    El acceso a las redes ATM y el dimensionado de sus recursos son cuestiones clave ya que cada vez hay una mayor demanda de ancho de banda por parte de los usuarios. Sin embargo, se necesitan alternativas económicamente viables. La multiplexación inversa ATM es una técnica con la que se combinan varios enlaces T1/E1 resultando en un único canal lógico de datos con tasa igual al agregado de los anchos de banda T1/E1 menos una pequeña cantidad debida a overhead de control. Resulta de gran interés...

  16. Uma abordagem de otimização robusta no planejamento agregado de produção na indústria cítrica A robust optimization approach for the aggregate production planning in the citrus industry

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    José Renato Munhoz

    2012-01-01

    Full Text Available Neste trabalho o planejamento agregado de produção de sucos concentrados congelados de laranja é modelado com considerações de incertezas em alguns parâmetros, de modo a constituir uma ferramenta efetiva de suporte à tomada de decisões. A abordagem de otimização robusta é baseada em um modelo determinístico de programação linear com múltiplos produtos, estágios e períodos proposto em Munhoz e Morabito (2010. Além das decisões de produção, mistura e estocagem de sucos, esse modelo também incorpora o planejamento de colheita da laranja, levando-se em consideração as curvas de maturação das frutas. Um estudo de caso foi realizado em uma empresa do setor localizada no estado de São Paulo, envolvendo várias plantas e uma rede de distribuição internacional. Os resultados computacionais obtidos com a abordagem de otimização robusta, utilizando uma linguagem de modelagem algébrica e um aplicativo de última geração de solução de problemas de programação matemática, indicam que a abordagem tem potencial para ser aplicada com sucesso em situações reais.In this work, a frozen concentrated orange juice aggregate production planning is modeled taking into account uncertainty in some parameters. This generates an effective tool to support decision making. The robust optimization approach is based on a linear programming model with multiple products, stages and periods proposed by Munhoz and Morabito (2010. Besides decisions in the production, blending and storage of juices, the model also includes an orange harvesting plan, which considers orange maturation curves. A case study was developed in an orange juice company located in the State of Sao Paulo. This company has different facilities and a worldwide distribution system. The computational results obtained from this robust optimization approach, using an algebraic modeling language and a state-of-the-art optimization solver; indicate that the approach can be

  17. Uma abordagem de otimização robusta no planejamento agregado de produção na indústria cítrica A robust optimization approach for the aggregate production planning in the citrus industry

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    José Renato Munhoz

    2013-06-01

    Full Text Available Neste trabalho o planejamento agregado de produção de sucos concentrados congelados de laranja é modelado com considerações de incertezas em alguns parâmetros, de modo a constituir uma ferramenta efetiva de suporte à tomada de decisões. A abordagem de otimização robusta é baseada em um modelo determinístico de programação linear com múltiplos produtos, estágios e períodos proposto em Munhoz e Morabito (2010. Além das decisões de produção, mistura e estocagem de sucos, esse modelo também incorpora o planejamento de colheita da laranja, levando-se em consideração as curvas de maturação das frutas. Um estudo de caso foi realizado em uma empresa do setor localizada no estado de São Paulo, envolvendo várias plantas e uma rede de distribuição internacional. Os resultados computacionais obtidos com a abordagem de otimização robusta, utilizando uma linguagem de modelagem algébrica e um aplicativo de última geração de solução de problemas de programação matemática, indicam que a abordagem tem potencial para ser aplicada com sucesso em situações reais.In this work, a frozen concentrated orange juice aggregate production planning is modeled taking into account uncertainty in some parameters. This generates an effective tool to support decision making. The robust optimization approach is based on a linear programming model with multiple products, stages and periods proposed by Munhoz and Morabito (2010. Besides decisions in the production, blending and storage of juices, the model also includes an orange harvesting plan, which considers orange maturation curves. A case study was developed in an orange juice company located in the State of Sao Paulo. This company has different facilities and a worldwide distribution system. The computational results obtained from this robust optimization approach, using an algebraic modeling language and a state-of-the-art optimization solver; indicate that the approach can be

  18. EFECTO DEL PRECALENTAMIENTO Y LA SEVERIDAD DE TEMPLE SOBRE LA RESISTENCIA AL DESGASTE ADHESIVO DEL ACERO AUSTENÍTICO AL MANGANESO

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    OSCAR FABIÁN HIGUERA COBOS

    2010-01-01

    Full Text Available En este trabajo de investigación se estudió el efecto del precalentamiento y la severidad de temple sobre la resistencia al desgaste adhesivo del acero austenítico al manganeso ASTM A 128 grado C. El material se sometió a ciclos térmicos de temple y revenido con y sin precalentamiento con el fin de evaluar su influencia sobre la resistencia al desgaste. Posteriormente el material fue sometido a prueba según norma ASTM G83 y se determinó que el acero Austenítico al manganeso, es un material que presenta una microestructura metaestable en condiciones estables y no debe ser sometido a tratamiento térmico de revenido a altas temperaturas debido que favorece la descomposición de esta a ferrita (fase blanda de los acero y por ende disminuye su resistencia al desgaste.

  19. VALOR AGREGADO DE LAS ESPECIES Brycon erythropterum (SÁBALO), Colossoma macropomum (GAMITANA), Arapaima gigas (PAICHE) y Agouti paca (MAJAS)

    OpenAIRE

    Doylith Vásquez Jurafo; Cinthya Córdova Ríos; Wendy Olórtegui Morey; Nirsa Cachique Oliveira; Luis Silva Ramos; Ricardo García Pinchi

    2012-01-01

    El presente trabajo tiene como objetivo  la obtención de  productos mínimamente procesados (PMP) de Brycon erythropterum (SÁBALO), Colossoma macropomum (GAMITANA), Arapaima gigas (PAICHE), y Agouti paca (MAJAS) congelado y empacado al vacio. Para las especies piscícolas, se ha aplicado un diseño factorial de 32 con dos factores de estudios: concentración de NaCl en la solución osmótica con tres niveles (15, 20 y 25 %) y temperatura de proceso  con tres niveles de estudio (5, 10 y 15 °C). Para...

  20. Determinación de la condición saturada y seca superficialmente (S.S.S. de agregados orgánicos para hormigón ligero

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    Jaime Salazar Contreras

    2011-02-01

    Full Text Available Como parte del provecto de grado titulado "DOSIFICACION DE HORMIGONES LIGEROS UTILIZANDO COMO ARIDO LA CASCARILLA DE CAFE II PARTE", se desarrolló un procedimiento para determinar la condición saturada y seca superficialmente (S.S.S. de la cascarilla de café debido a que no existe ninguna literatura técnica que establezca los pasos a seguir para hallar la condición s.s.s de agregados ligeros, como si la hay para los agregados tradicionales del hormigón. Puesto que los agregados orgánicos presentan una elevada absorción, se hace necesario determinar un procedimiento de ensaya que permita obtener la condición s.s.s., del agregado de una manera precisa y más confiable que la obtenida mediante la inspección visual, procedimiento éste utilizado hasta ahora en el diseño de mezclas para los agregados ligeros de naturaleza orgánica. El ensayo consiste básicamente en someter a un proceso de secado una muestra de cascarilla saturada hasta que desaparece el agua libre contenida en ella, hecho que se manifiesta por la variación de la temperatura del bulbo húmedo medida por un termómetro colocado en el centro de la muestra; la humedad determinada en este momento corresponde a la condición s.s.s. de la cascarilla, valor éste que se utilizará posteriormente para determinar las propiedades físicas requeridas para el diseño y en especial para establecer con gran aproximación la relación agua-cemento (A/c parámetro fundamental que rige la resistencia del hormigón. Estos ensayos se realizaron en el laboratorio de Ingeniería Agrícola de la Universidad Nacional de Bogotá

  1. Distribuição dos agregados e carbono orgânico influenciados por manejos agroecológicos = Aggregate and organic carbon distribution influenced by agroecological handling

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    Arcângelo Loss

    2009-07-01

    Full Text Available O objetivo deste estudo foi verificar a influência do manejo agroecológico na distribuição dos agregados estáveis em água e no teor de carbono orgânico dos agregados em diferentes coberturas vegetais. Foram selecionadas cinco áreas, a saber: sistema agroflorestal; cultivo de figo (Ficus carica L.; consórcio maracujá (Passiflora edulis S.–Desmodium sp.; cultivo de feijão (Phaseolus vulgaris L., em manejo convencional, e cultivo de milho (Zeamays L., em plantio direto. Em cada área, foram coletadas amostras de terra indeformadas, nas profundidades de 0 - 5 e 5 - 10 cm, e avaliada a estabilidade dos agregados e o teor de carbono orgânico nos agregados (COAGR. A maior massa de agregados encontra-se naclasse de 2,00 mm, em ambas as profundidades, com exceção do cultivo de feijão. Nas duas profundidades, a classe de 2,00 mm apresentou os maiores valores de COAGR para a área do consórcio macaracujá - Desmodium sp.The objective of this study was to verify the influence ofagroecological handling in the distribution of stable aggregates in water and in the levels of aggregate organic carbon under different vegetable covers. Five areas were selected: agroflorestal system; fig cultivation (Ficus carica L.; passion fruit (Passiflora edulis S. and Desmodium sp. consortium; bean cultivation (Phaseolus vulgaris L, under conventional system; and corn (Zea mays, in no-tillage system. In each area, undisturbed samples were collected, in 0-5 and 5-10 cm depths, and water aggregate distribution and organic carbon ofaggregate (OCAGR were quantified. The highest aggregate mass was observed in the 2.00 mm aggregate class, in both depths, except for the bean cultivation area. In both depths, the class with greater diameter showed the highest OCAGR values for the area of passion fruit– Desmodium sp. consortium.

  2. Caracterização microestrutural da argila expandida para aplicação como agregado em concreto estrutural leve Microstructural evaluation of expanded clay to be used as lightweight aggregate in structural concrete

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    W. G. Moravia

    2006-06-01

    Full Text Available A utilização da argila expandida como agregado graúdo é economicamente viável na fabricação de concretos devido à redução da massa especifica que estes agregados proporcionam, minimizando os carregamentos atuantes nas estruturas. O objetivo deste trabalho é caracterizar a microestrutura do agregado leve de argila expandida visando sua utilização na fabricação de concretos. Na caracterização física da argila expandida foram avaliadas a massa unitária, a granulometria e a absorção de água por imersão total do agregado. Na caracterização microestrutural, foram realizadas análise química, microscopia eletrônica de varredura, difração de raios X e porosimetria por intrusão de mercúrio. A argila expandida apresentou granulometria entre as britas com graduação 0 e 1, e apresentou alta absorção de água devido à elevada porosidade deste agregado. Na análise de difração de raios X evidenciou-se a presença de sílica na forma mineral de alfa-quartzo, silicato de magnésio e óxido de alumínio e magnésio.The use of expanded clay as aggregate is economically feasible in the manufacturing of concrete due to the decrease in bulk density, provided by these aggregates, minimizing the total weight of the structures. The objective of this work is to characterize the microstructure of expanded clay aggregates which are used in the manufacturing of lightweight concretes. The expanded clay was evaluated concerning of the density, the granulometry and water absorption after total immersion of the aggregate. The chemical analysis, scanning electron microscopy, X-ray diffraction and mercury intrusion porosimetry were used as well. The expanded clay presented granulometry between the aggregates grades 0 and 1 and high water absorption due to the high porosity of the aggregate. The X-ray diffraction data showed the presence of alpha-quartz, magnesium silicate and magnesium aluminum oxide.

  3. Distribuição de agregados e carbono orgânico em um Argissolo Amarelo distrocoeso em diferentes manejos Distribution of aggregates and organic carbon in an Ultisol submitted to different managements

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    Veronildo S. Oliveira

    2010-09-01

    Full Text Available O objetivo principal deste estudo foi avaliar a estabilidade e a distribuição de agregados em um Argissolo Amarelo distrocoeso comparando-se os valores de uma área de mata nativa (MA, com três áreas cultivadas com cana-de-açúcar sendo uma sem irrigação (MSI, uma com irrigação (MCI e outra sob fertirrigação com vinhaça (MCV. O solo das três áreas cultivadas foi submetido ao mesmo tipo de preparo: gradagem pesada, gradagem leve e subsolagem. Amostras de solo com estrutura indeformada na área de mata e de cada área cultivada foram coletadas para determinação da estabilidade de agregados, expressa pelo diâmetro médio ponderado (DMP, índice de estabilidade de agregados (IEA, módulo de finura (MF, porcentagem de agregados estáveis em água com diâmetros maiores que 2,0 mm (AGRI e valores de carbono total. Os distintos tipos de manejo do solo com cana-de-açúcar promoveram perda da estabilidade de agregados com o aumento da profundidade. A estabilidade de agregados foi reduzida em relação à mata nativa na sequência: MA > MCV > MCI > MSI. Registraram-se, na área sem irrigação (MSI os menores índices de agregação, em que na submetida a fertirrigação com vinhaça (MCV os valores foram semelhantes aos da área de mata nativa apresentando maior índice de estabilidade de agregados em água. Correlações significativas e positivas foram obtidas entre carbono orgânico total e os índices de agregação do solo (DMP > AGRI > MF > IEA sob diferentes situações de manejo.The main objective of this study was to evaluate the stability and aggregate distribution of an Ultisol submitted to different management systems under sugarcane cultivation. Evaluated areas consisted of native forest (MA and sugarcane managed areas with irrigation (MCI, vinasse irrigation (MCV and without irrigation (MSI. Management of the areas followed the same conventional preparation: heavy and light harrowing and subsoiling. Undeformed soil samples

  4. Transporte de NO3- e NH4+ em agregados de Latossolo Vermelho com e sem atividade biológica NO3- and NH4+ transport in a typic Haplortox aggregates with and without biological activity

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    Fábio C. Coelho

    2007-08-01

    Full Text Available Objetivou-se, com este trabalho, avaliar a influência do tamanho dos agregados de um Latossolo Vermelho distrófico sobre as transformações e transporte do amônio e do nitrato em condições de presença e ausência de atividade biológica. Utilizou-se o fatorial 2³ x 4, com fatores e níveis: vegetação de cobertura do solo (cerrado e milho ; atividade biológica (com e sem esterilização do solo; fontes de N da solução com 10 mimol L-1 de N, para saturação das colunas (Ca(NO32 e NH4CI e classes de agregados (2,0 a 1,0; 1,0 a 0,5; 0,5 a 0,25 e 0,25 a 0,105 mm. Na primeira eluição, o efluente das colunas contendo microbiota ativa e saturação com Ca(NO32 apresentou teor de NO3- menor no efluente dos agregados de 0,25 a 0,105 mm; já em condições de esterilização, ocorreu o inverso: maior concentração do NO3- no efluente dos agregados de 0,25 a 0,105 mm. Para as colunas saturadas com NH4CI, na primeira eluição os teores do NH4+ foram maiores nos efluentes dos agregados de 0,25 a 0,105 mm para todas as combinações de cobertura de solo e esterilização, enquanto na presença da microbiota ativa o efluente dos agregados de 0,25 a 0,105 mm apresentou teor semelhante ao dos agregados de 0,5 a 0,25 mm.A laboratory experiment was carried out in a randomized block design with three replications, in which columns with aggregate classes 2.0-1.0; 1.0-0,5; 0.5-0.25 and 0.25-0.105 mm of a typic Haplortox were used. The treatments corresponded to a 2³ x 4 factorial, with soil covering vegetation (savannah and maize; biological activity (with and without soil sterilization with methyl bromide; sources of N with 10 mumol L-1 of N for saturation of the columns (Ca(NO32 and NH4CI; and aggregate classes (2.0-1.0; 1.0-0.5; 0.5-0.25 and 0.25-0.105 mm. After seven days of incubation of the columns with aggregates at maximum water retention, percolations were made with water, after two days under saturated condition, totaling six samples (0, 2

  5. agregado gr4j aplicación: Cuenca del río aburrá

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    LUIS_FERNANDO CARVAJAL

    2007-01-01

    Full Text Available El presente trabajo muestra la calibración del modelo lluvia-escorrentía GR4J en 8 subcuencas de la cuenca del río Aburrá. Este modelo es considerado parsimonioso ya que solo tiene 4 parámetros. La calibración incluye la optimización de los parámetros. La calidad del ajuste se verificó comparando la serie simulada de caudales y el respectivo registro, las curvas de duración de caudales, así como mediante 4 criterios de eficiencia. Los resultados muestran en general ajustes aceptable, si se tiene en cuenta la variabilidad del área de las subcuencas, de la precipitación y de la evaporación, y el efecto de la zona urbana en cuanto al aporte de caudales de aguas residuales.

  6. Entre puertos, campos y acopios: Trabajo y transporte de granos en torno al Sudeste bonaerense.

    OpenAIRE

    Paula Tagliabue

    2014-01-01

    En este artículo, se analiza el proceso de trabajo en el transporte automotor de granos en torno al sudeste bonaerense. Desde un abordaje cualitativo, se describen y analizan las prácticas durante la cosecha y pos-cosecha, y los trayectos campo-acopio, acopio-puerto. También se analizan las relaciones laborales a partir de una perspectiva ampliada de las relaciones laborales clásicas (asalariadas, estables, protegidas).Los rasgos que asume el trabajo en el transporte de granos están asociados...

  7. Texturas, inclusiones fluidas e isótopos estables envetas tensionales cuarzo-auríferas de cizallas paleozoicas, Sierras Pampeanas Orientales

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    Diana Mutti

    2009-06-01

    Full Text Available En las Sierras Pampeanasafloran prominentes zonas de cizalla famatinianas con deformación dúctil adúctil frágil y edad ordovícica tardía - silúrica. Estas cizallas fueronreactivadas durante el Devónico - Carbonífero inferior por la sobreimposiciónde la orogenia achaliana, en un ambiente reológico dúctil - frágil, que en suetapa final evolucionó al campo frágil. Sincrónicamente, y con posterioridad almagmatismo devónico achaliano, se desarrollaron en las cizallas sistemas devetas tensionales, rellenas con cuarzo blanco1, blanco a gristraslúcido2, gris3 y calcedónico4, conmineralización de oro, óxidos de W - Fe - Bi y sulfuros de metales base. En lossistemas de vetas, la depositación de oro predominó en el estadio3, enel cual precipitaron también los sulfuros de metales base (< 15 % envolumen, dispuestos en cadena y diseminaciones dentro de un agregadomicrogranoso de cuarzo gris. Esta variedad de cuarzo se depositó en venillas ybandas, vinculadas con sitios de deformación en el cuarzo blanco lechoso y gristraslúcido, y determinó texturas laminadas, en ribbon y brechosa,principalmente. Este trabajo se focaliza en el estudio del cuarzo gris3,mediante estudios meso y microestructurales, termobarométricos a partir deinclusiones fluidas e isotópicos de δ18O, complementándose condatos provenientes de las variedades de cuarzo blanco1, calcedónico4y rocas metamórficas e ígneas del basamento. Los resultados señalan laexistencia de inclusiones bifásicas y trifásicas, temperaturas dehomogeneización en torno a ~ 278°C, bajas salinidades (< 5,22 %e.p. NaCleq,subpresión de fluidos (Pint < Pconf, y fluidos hidrotermales derivados defuentes magmáticas y/o metamórficas. Las condiciones de formación para elestadio3, son consistentes con un proceso de deformación,neomineralización y relleno de fracturas tensionales, en condiciones reológicasfrágiles e interacción de los fluidos con las rocas del basamento, durante

  8. Abordagem adaptativa aplicada ao planejamento agregado da produção sob incertezas Adaptive approach applied to aggregate production planning under uncertainties

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    Oscar Salviano Silva Filho

    2010-03-01

    Full Text Available Um problema de planejamento agregado da produção, com incertezas sobre a flutuação da demanda, é formulado através de um modelo de otimização estocástica, com critério quadrático e restrições lineares. Dificuldades para encontrar uma solução ótima global para o problema levam à proposição de uma abordagem adaptativa de fácil implementação computacional que é baseada na formulação de um problema determinístico equivalente e que tem sua solução periodicamente revisada por meio de um procedimento clássico da literatura. Um exemplo, em que o sistema de balanço de estoque está sujeito à forte e fraca variabilidade da demanda real, é empregado para analisar o comportamento da abordagem proposta. Por fim, os resultados obtidos são comparados com outra abordagem subótima, cuja principal característica é não permitir revisões periódicas.A problem of aggregate production planning, with uncertainty about the fluctuation in demand, is formulated by a stochastic optimization model, with quadratic criterion and linear constraints. Difficulties in finding a global optimum solution to the problem lead to the proposal of an adaptive approach which is easy to implement computationally and which is based on the formulation of a deterministic equivalent problem, the solution for which is periodically reviewed through a classical procedure of literature. An example, where the inventory balance system is subject to weak and strong variability in actual demand, is employed to analyze the behavior of the proposed approach. Finally, the results provided by the proposed approach are compared with another suboptimal approach, the main characteristic of which is not allowing periodic reviews.

  9. Propuesta de mejora del índice agregado de impacto. Aplicación a la valoración de sexenios de investigación

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    Ortega Irizo, Francisco Javier

    2003-12-01

    Full Text Available The advisory committee of the area of Economic and Management Sciences of the CNEAI values the journals that appear in the JCR on the basis of an aggregate index of impact that multiplies the Impact Factor by the Cited Half Life or Median of the citation age data of each journal. In the database JCR the cites older than 10 years are aggregated, therefore when these cites constitute more than 50% of the total we cannot calculate the median. The committee takes in these cases 9.9 as value for the median. We propose to obtain an estimation of it fitting previously a Weibull model in the presence of censored data. As a consequence, it is possible to value the journals with a very slow ageing more precisely.

    El comité asesor del área de Ciencias Económicas y Empresariales de la CNEAI valora las revistas que aparecen en el JCR en base a un índice de impacto agregado, que multiplica el Factor de Impacto por el «Cited Half Life» o Mediana de la antigüedad de las citas recibidas por cada revista. En la base de datos JCR las citas de antigüedad superior a 10 años aparecen agregadas, por lo tanto, cuando estas citas constituyen más del 50% del total no podemos calcular la mediana. El comité toma, en estos casos, 9,9 como valor de la mediana. Nosotros proponemos obtener una estimación de la misma previo ajuste de un modelo Weibull en presencia de datos censurados; como consecuencia, es posible valorar con mayor precisión aquellas revistas cuyo proceso de envejecimiento es muy lento.

  10. El valor agregado en servicios médicos veterinarios (The value-added services in veterinarians

    Directory of Open Access Journals (Sweden)

    Alejandra Mejía V

    2010-04-01

    Full Text Available ResumenSe debe entender que el ejercicio de la Medicina Veterinaria tiene como un componente muy importante la prestación de servicios, pues las mascotas en general se han convertido en parte del núcleo familiar y exigen atención. Así, el médico veterinario, debe ofrecer más que una asesoría en el cuidado y salud de estas, estableciendo una relación afectiva con el cliente, que se verá revertida en ganancia para la empresa y para el equipo humano que la conforma. Lo que se debe buscar es ofrecer productos y servicios percibidos por el cliente como únicos, combinando factores que permitan aumentar considerablemente la calidad, que posibiliten otorgar un mayor precio y simplifiquen la transacción para el cliente. A esto se llama “valor agregado”. Es el cliente quien tiene la decisión final sobre el valor que le asignará al producto o servicio, por lo que será fundamental escucharlo y obtener de este la información para el proceso de generación de valor. El medico veterinario ha enfocado sus estudios y profundizaciones principalmente a temas de tipo médico y científico, tópicos fundamentales para ganar estatus y confianza en el cliente final, pero que deberían ser complementados con los conceptos de las ciencias administrativas y los avances tecnológicos que puedan afectar positivamente el interior de su negocio y los servicios que en general ofrece

  11. VALOR AGREGADO DE LAS ESPECIES Brycon erythropterum (SÁBALO, Colossoma macropomum (GAMITANA, Arapaima gigas (PAICHE y Agouti paca (MAJAS

    Directory of Open Access Journals (Sweden)

    Doylith Vásquez Jurafo

    2012-12-01

    Full Text Available El presente trabajo tiene como objetivo  la obtención de  productos mínimamente procesados (PMP de Brycon erythropterum (SÁBALO, Colossoma macropomum (GAMITANA, Arapaima gigas (PAICHE, y Agouti paca (MAJAS congelado y empacado al vacio. Para las especies piscícolas, se ha aplicado un diseño factorial de 32 con dos factores de estudios: concentración de NaCl en la solución osmótica con tres niveles (15, 20 y 25 % y temperatura de proceso  con tres niveles de estudio (5, 10 y 15 °C. Para el Agouti paca (majas se aplico un diseño factorial completamente aleatorizado con tres factores de estudio: tiempo de proceso (30, 60 y 90 minutos, método de ahumado (ahumado líquido y ahumado en caliente y tipo de corte del músculo (partes y filetes. Para trabajar se ha diseñado y montado un deshidratador Osmótico teniendo en cuenta, diámetro de tubería, deshidratador propiamente dicho con doble chaqueta, capacidad del deshidratador en función del volumen de la Salmuera.  Todos los productos se obtuvieron  en procesos con 10 °C y tiempos entre 30 min y  90 min. El tiempo de vida en almacenamiento en las evaluaciones de aroma y color en majas tienen una vida útil de 4 meses de almacenados a -18 °C. Los análisis microbiológicos realizados a los PMP no pasan los límites de la NTS Nº 071 MINSA/DIGESA V01.

  12. Influência da temperatura no diâmetro e na estabilidade de agregados em Chernossolo, Saskatchewan, Canadá Temperature effect on aggregate diameter and stability in a Chernozem from Saskatchewan, Canada

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    Edivaldo Lopes Thomaz

    2011-12-01

    Full Text Available O papel do fogo nos processos ambientais é amplamente reportado nos diversos ecossistemas da Terra. O fogo influencia diversos processos ambientais no solo (e.g. infiltração, erodibilidade, dinâmica de matéria orgânica etc.. Os objetivos deste ensaio realizado em laboratório foram: 1 verificar o efeito da temperatura na estabilidade de agregados em Chernossolo de ambiente temperado; 2 avaliar dois procedimentos para se detectar tal efeito nos agregados do solo (i.e. peneiramento seco e peneiramento submerso em água; 3 aplicar diferentes índices para mensurar possíveis mudanças na distribuição e na estabilidade de agregados (diâmetro médio, diâmetro médio geométrico e estabilidade de agregados em porcentagem. As amostras foram aquecidas em Forno Mufla, sendo submetidas aos seguintes tratamentos: controle (temperatura ambiente, 200 oC e 300 oC por 20 minutos e 580 oC durante 10 minutos. O solo foi afetado pelas diferentes temperaturas aplicadas. Na temperatura de 200 oC, verificou-se diminuição no diâmetro médio, no diâmetro médio geométrico e na estabilidade de agregados do solo. Os agregados de 2,8 mm foram os mais influenciados por esta temperatura. De modo contrário, a temperatura de 580 oC causou aumento nos referidos índices. A temperatura de 300 oC causou resposta intermediária em comparação as demais temperaturas. O peneiramento submerso em água foi a técnica mais eficiente na detecção do efeito da temperatura no solo.The role of fire on environmental processes is widely reported in several Earth ecosystems. Fire affects environmental processes (e.g. infiltration, erodibility, organic matter dynamic etc.. The objectives of this laboratory study were: 1 to establish the effect of temperature on aggregate stability in a Chernozem soil from a temperate environment; 2 to evaluate two procedures to detect such effects on soil aggregates (i.e. dry and wet sieving; 3 to use different indexes to measure possible

  13. Análise micromorfométrica de agregados de um LATOSSOLO VERMELHO Distroférrico em diferentes sistemas de manejo = Micromorphometric analysis of aggregates of Rhodic Hapludox under different management systems

    Directory of Open Access Journals (Sweden)

    Cassiano Cremon

    2009-01-01

    Full Text Available O objetivo deste trabalho é caracterizar micromorfometricamente os agregados de um Latossolo submetido a diferentes formas de manejo do solo. O trabalho desenvolveu-se em um LATOSSOLO VERMELHO Distroférrico, de Dourados, Mato Grosso do Sul. O delineamento experimental utilizado foi o de blocos casualizados com quatro repetições e os tratamentos foram arranjados em parcelas sub-subdivididas. Os tratamentos consistiram de dois sistemas de manejo (convencional e plantio direto, duas doses de gesso (zero e 2 t ha-1 e a utilização de duas culturas de verão (soja e milho. Os agregados foram coletados, nas profundidades de 0 a 10 e 10 a 20 cm, utilizando-se, nos procedimentos experimentais, os retidosno intervalo de diâmetro de 9,52 e 4,76 mm, após peneiramento em um jogo de peneiras-padrão. As análises dos agregados foram realizadas por meio de imagens digitais obtidas via scanner (300 dpi em 60 agregados dispostos em um tabuleiro de furos desencontrados. As imagens foram posteriormente analisadas com o programa QUANTPORO, e a característica analisada dos agregados foi a área e sua inter-relação com atributos químicos do solo. Os resultados demonstraram que o sistema de plantio direto proporcionou a formação de agregados maiores, a soja como cultura de verão contribuiu para esse efeito estrutural no solo e a aplicação de gesso agrícola incrementou a agregação em maiores profundidades.The aim of this work is to characterize, using a micromorphometric analysis, the aggregates of a Hapludox submitted to different management systems. This work was carried out in a Rhodic Hapludox in Dourados-MS. The experimental design was in randomized blocks with four replications and treatments arranged in subsubdivided plots. Treatments were established in two management systems (conventional and no-tillage, two doses of gypsum (zero and 2 t ha-1 and the use of two summer crops (soybean and corn. Aggregates were collected, in depths of 0 to 10

  14. Resistencia al desgaste abrasivo de recubrimientos producidos por proyección térmica para aplicaciones navales

    OpenAIRE

    Gutiérrez Quintero, Wilder

    2015-01-01

    El presente trabajo estudia la resistencia al desgaste abrasivo de dos tipos de recubrimientos a base níquel. El primero, Metaceram 23075 con agregados cerámicos de carburo de tungsteno y cobalto WC/Co y el segundo, Nitec 10224 con adiciones de hierro, boro y silicio; aplicados sobre los sustratos de fundición gris y bronce fosforado, mediante la técnica de proyección térmica a la llama. En la primera etapa se muestra la construcción y puesta a punto del equipo para ensayos de desgaste abrasi...

  15. Dinámica de fotodisociación ultravioleta de agregados de van der Waals con enlaces de hidrógeno : aplicación a Ar-HCl

    OpenAIRE

    Juanes Marcos, Juan Carlos

    2002-01-01

    En este trabajo de tesis se investiga la dinámica de fotodisociación ultravioleta del agregado Ar - HCl mediante cálculos cuánticos exactos de paquete de ondas y cálculos clásicos, en tres dimensiones, suponiendo momento angular total nulo. Para ello se realiza un estudio resuelto en energía de los dos posibles canales de fragmentación de Ar - HCl: fragmentación parcial en H + Ar - Cl y total en H + AR + Cl. El paquete de ondas asintótico ha sido proyectado sobre los estados correspondientes ...

  16. Compressibilidade de agregados de um Latossolo Amarelo da Amazônia em resposta ao potencial da água do solo Aggregate compressibility of an Amazon Oxisol in response to water potential

    OpenAIRE

    João Tavares Filho; Michel Grimaldi; Daniel Tessier

    2005-01-01

    Normalmente a utilização agrícola dos solos é realizada com máquinas e implementos pesados que lhes causam compactação, responsável por afetar a disponibilidade de ar e de água para as plantas. O objetivo deste trabalho foi estudar o comportamento de agregados de Latossolo Amarelo da Amazônia sob compressão mecânica, submetidos a quatro níveis de umidade. Amostras de solo, úmidas e indeformadas, coletadas sob floresta, no horizonte A, a 10 cm de profundidade, e no horizonte B, a 150 cm de pro...

  17. Mineral trióxido agregado en pulpotomías de dientes primarios: Revisión de la literatura Mineral trioxide aggregate in primary teeth pulpotomy: Literature review

    OpenAIRE

    M. Simancas Pallares; L. Luna Ricardo; A. Díaz Caballero

    2011-01-01

    Introducción: la odontología basada en la evidencia supone una evaluación, crítica, de la evidencia disponible para mejorar la toma de decisiones en relación con el cuidado individual de los pacientes y/o comunidades. Objetivo: analizar la literatura científica disponible sobre los resultados clínicos y radiográficos de cuatro materiales empleados en pulpotomías en la dentición temporal: formocresol, sulfato férrico, hidróxido de calcio, mineral trióxido agregado. Materiales y métodos: se ide...

  18. Análisis del comportamiento de dos tipos de agregado trióxido mineral en relación a variaciones en su composición

    OpenAIRE

    Antoranz Pereda, Ana

    2015-01-01

    El agregado trióxido mineral (MTA) es un material que se ha consolidado para el tratamiento de numerosas patologías con necesidad de sellado endo-periodontal. Los MTA que llevan más tiempo comercializados son los de Dentsply y Ángelus. Existen diferencias entre los MTA de ambas empresas, destacando las referidas a composición y tamaño y forma de sus partículas de polvo. La extensión de su uso se ha basado en sus resultados de biocompatibilidad y capacidad de sellado. Sin embargo, es de difíci...

  19. Riscos isolados e agregados de anemia em crianças frequentadoras de berçários de creches Isolated and combined risks for anemia in children attending the nurseries of daycare centers

    OpenAIRE

    Tulio Konstantyner; José Augusto A.C. Taddei; Mariana N. Oliveira; Domingos Palma; Fernando A. B. Colugnati

    2009-01-01

    OBJETIVO: Identificar e quantificar os fatores de risco isolados e agregados de anemia, proporcionando visão ampliada quanto à probabilidade da sua ocorrência. MÉTODOS: Estudo transversal com 482 crianças, entre 4 e 29 meses de idade, frequentadoras de berçários de creches públicas e filantrópicas do município de São Paulo (SP), que participaram de dois inquéritos (2004 e 2007). Foram realizadas entrevistas com as mães, coleta de sangue por punção digital e antropometria. Considerou-se anemia...

  20. Otimização no planejamento agregado de produção em indústrias de processamento de suco concentrado congelado de laranja Optimization in the aggregate production planning in frozen concentrated orange juice processing industry

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    José Renato Munhoz

    2010-01-01

    Full Text Available Neste trabalho apresentam-se modelos de programação linear e programação por metas para apoiar decisões no processo de planejamento agregado da produção de suco concentrado congelado de laranja, com múltiplos produtos, estágios e períodos. Além das decisões de produção, mistura e estocagem de sucos, os modelos também incorporam o planejamento de colheita da laranja, levando-se em consideração suas curvas de maturação. Desta maneira, os modelos consideram grande parte da cadeia de suprimento envolvida no setor de produção de suco concentrado congelado de laranja. Outro ponto a destacar é a consideração do processo de mistura de diferentes tipos de sucos para a obtenção da especificação de ratio do produto acabado, utilizando a acidez da laranja como base de cálculo para a especificação de ratio. Para resolver os modelos de programação linear e programação por metas, utilizou-se uma linguagem de modelagem algébrica e um aplicativo de última geração de solução de problemas de programação matemática. Um estudo de caso foi realizado em uma empresa de suco de laranja localizada no Estado de São Paulo, envolvendo várias plantas e com uma rede de distribuição internacional com características típicas de outras empresas do setor. Os resultados indicam que a abordagem aqui proposta pode ser aplicada em situações reais.This work presents models using linear programming and goal programming to support decision making in the frozen concentrated orange juice planning process with multiple products, stages, and periods. Besides decisions about the production, blending, and juice storage, the models also include orange harvesting plan, which takes into account oranges maturation curves. Thus, the models take into consideration a large portion of the supply chain involved in the frozen concentrated orange juice sector. Another point to highlight is the inclusion of the blending process of different types of

  1. Cuestiones sobre el derecho al trabajo derivadas de la reforma laboral de 2012 : perspectiva constitucional = The right to work under the labour reform of 2012: a constitutional approach

    OpenAIRE

    Naranjo De La Cruz, Rafael

    2014-01-01

    La reforma laboral de 2012 ha suscitado importantes cuestiones acerca del régimen jurídico del derecho al trabajo. Así, en este artículo se sostiene que la introducción de una modalidad contractual que concede al empresario la potestad de resolver libremente el contrato laboral durante el primer año supone, ya sea concebido este plazo como periodo de prueba o como medio para el fomento de un empleo estable, una vulneración del derecho del trabajador a la estabilidad en el empleo, reconocido c...

  2. Estudio sísmico de los edificios agregados de obra de fábrica utilizando el método del espectro de capacidad

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    Moreno-González, R.

    2014-03-01

    Full Text Available In this work a study about the seismic behaviour of a set of masonry aggregates buildings located in the city of Barcelona, Spain, is presented. Considering the age of these buildings (more than 70 years two mechanical properties for the masonry were defined. The seismic action considered is defined by elastic response spectrum defined by Eurocode 8 for the seismic acceleration of Barcelona. To analyze these buildings the capacity spectrum method was used, from which the capacity curve and the fragility curves are obtained for evaluating the seismic expected damage. Damage probability matrices quantified the seismic damage and they are obtained from the fragility curves and the performance point. Considering that the city of Barcelona is located in an area of low seismicity, the results show an important seismic damage.Se presenta un estudio sobre el comportamiento sísmico de un conjunto de edificios agregados de obra de fábrica situados en la ciudad de Barcelona, España. Considerando la edad que tienen estos edificios (más de 70 años se definen dos propiedades mecánicas para la mampostería. La acción sísmica considerada se define a partir del espectro elástico de respuesta definido en el Eurocódigo 8 para la aceleración sísmica de Barcelona. Para analizar los edificios se utiliza el método del espectro de capacidad, a partir del cual se obtienen la curva de capacidad y las curvas de fragilidad para evaluar el daño sísmico esperado. Las matrices de probabilidad de daño cuantifican el daño sísmico y se obtienen a partir de las curvas de fragilidad y el punto de capacidad por demanda. Teniendo en cuenta que Barcelona se encuentra en una zona de baja sismicidad, los resultados obtenidos muestran un daño sísmico importante.

  3. Cuantificación y procedencia de los intercambios de CO2 en un ecosistema carbonatado mediante la técnica de eddy covariance y el análisis de los isótopos estables de carbono

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    P. Serrano-Ortiz

    2010-01-01

    Full Text Available Los intercambios de CO2 entre atmósfera y ecosistemas, así como los procesos que intervienen en dichos intercambios, son de vital interés para la caracterización del ciclo global del carbono y la repercusión del calentamiento global sobre estos ecosistemas naturales. En ecosistemas de origen carbonatado, los procesos biológicos de fotosíntesis y respiración interactúan con procesos de ventilación de cavidades y de disolución y precipitación de carbonatos que pueden incluso dominar el intercambio de CO2 en determinadas épocas del año. En este trabajo, se usó la técnica de eddy covariance junto con análisis de los isótopos estables de carbono y medidas de flujo de CO2 de suelo y otras variables meteorológicas, para determinar la procedencia del CO2 intercambiado. Los resultados obtenidos demuestran que el ecosistema actúa como sumidero o fuente de CO2 en función de las condiciones meteorológicas y la época del año. Bajo condiciones óptimas de temperatura y recursos hídricos, la huella isotópica del carbono (d13C del aire alcanza valores muy negativos indicando un origen biológico del intercambio. En épocas de sequía y senescencia biológica estos procesos se reducen considerablemente. La atmósfera externa y la cavidad toman valores de d13C muy similares indicando un alto grado de ventilación de la cavidad.

  4. El personal al servicio de las entidades locales

    OpenAIRE

    Bartolomé González, Susana

    2015-01-01

    El presente trabajo que se expone a continuación consiste en un estudio analítico del personal al servicio de las Entidades Locales en España. El tema de estudio fue elegido debido a la importancia que tiene hoy en día la posibilidad de tener un puesto de trabajo estable, duradero y permanente, y como es en este caso, el ámbito de la Administración, ya sea en la Administración Estatal, la Administración Autonómica o la Administración Local, la cual me compete. El empleo público local se ha...

  5. Resistência inter e intra-agregados em ensaios de cisalhamento direto de um nitossolo vermelho distrófico Inter and intra-aggregate strength in direct shear tests of a typic hapludox

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    João Alfredo Braida

    2007-04-01

    Full Text Available Para solos agregados, a envoltória da resistência ao cisalhamento pode ser dividida em dois segmentos, com declividades e interceptos diferentes. Um primeiro segmento mais inclinado e com intercepto menor representaria a envoltória de ruptura definida pelo atrito e coesão interagregados, enquanto o segundo segmento, menos inclinado e com intercepto maior, seria a envoltória definida pelo atrito e coesão intra-agregados. O presente estudo foi realizado com o objetivo de avaliar se a envoltória de resistência ao cisalhamento de agregados do horizonte superficial de um Nitossolo Vermelho pode ser subdividida em segmentos distintos, com coeficientes angulares diferentes, e se isso está relacionado à existência de agregados nele. Inicialmente, amostras coletadas na superfície de um Nitossolo Vermelho distrófico latossólico de textura argilosa foram submetidas ao ensaio de cisalhamento direto com pressões normais de 24,4; 48,9; 98,2; 196,4; 294,6; 392,8 e 491,8 kPa. Posteriormente, o ensaio foi realizado com amostras de agregados de cinco classes de diâmetro: For aggregated soils the Mohr failure line can be separated into two straight lines, with different slopes and intercepts. In the range of low normal load, when the slope is very steep and the intercept is small, the failure line is defined by the friction and cohesion inter-aggregates, while for the higher load range the slope becomes smaller and intercept is larger, which defines the intra-aggregate friction and cohesion. Therefore, for aggregated soils the normal load range used in the direct shear test affects the final result. The present study was carried out with the objective of evaluating if the Mohr failure line of a Red Latosolic Nitisol can be subdivided in different segments, with different steepness and intercepts, and if this is related to the existence of soil aggregates. Initially, soil surface samples of a Typic Hapludox (Nitossolo Vermelho Distrófico latoss

  6. Compressibilidade de agregados de um Latossolo Amarelo da Amazônia em resposta ao potencial da água do solo Aggregate compressibility of an Amazon Oxisol in response to water potential

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    João Tavares Filho

    2005-07-01

    Full Text Available Normalmente a utilização agrícola dos solos é realizada com máquinas e implementos pesados que lhes causam compactação, responsável por afetar a disponibilidade de ar e de água para as plantas. O objetivo deste trabalho foi estudar o comportamento de agregados de Latossolo Amarelo da Amazônia sob compressão mecânica, submetidos a quatro níveis de umidade. Amostras de solo, úmidas e indeformadas, coletadas sob floresta, no horizonte A, a 10 cm de profundidade, e no horizonte B, a 150 cm de profundidade, foram utilizadas neste trabalho. No laboratório, essas amostras foram fragmentadas e peneiradas para obtenção de agregados de 2 a 3 mm de diâmetro, os quais foram colocados em equilíbrio com umidade de quatro potenciais matriciais para, após essa etapa, sofrerem uma compressão uniaxial com pressões de 32 a 1.000 kPa. Os resultados mostraram que a maior compressibilidade dos agregados, tanto para o horizonte A como para o B, ocorreu para o potencial matricial -32 kPa (umidade de 0,38 kg kg-1, enquanto a menor ocorreu para os potenciais -1 kPa e -1.000 kPa (umidade de 0,32 e 0,30 kg kg-1, respectivamente, indicando que esse solo não deve ser trabalhado com umidades próximas a 0,38 kg kg-1. A maior redução de volume dos agregados, tanto para o horizonte A como para o horizonte B, foi obtida para pressões mecânicas inferiores a 400 kPa, indicando que esses solos são bastante sensíveis à compactação, principalmente os agregados do horizonte A, possivelmente por terem melhores condições estruturais decorrentes do maior teor de matéria orgânica.The agricultural use of soils usually relies on the use of heavy machinery that cause soil compaction, affecting the amount of air and water available for plants. The present study was carried out in the year 2000 and aimed at studying the performance of aggregates of an Amazon Oxisol under mechanical compression and that were subjected to varying degrees of matric potential

  7. Programação estocástica robusta aplicada ao planejamento agregado de safra em usinas cooperadas do setor sucroenergético Stochastic robust optimization model applied to the aggregate production planning in mill cooperative socities in the sugar-energy sector

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    Rafael Piatti Oiticica de Paiva

    2011-01-01

    Full Text Available Neste trabalho, apresenta-se um modelo de programação estocástica robusta aplicado ao planejamento agregado da produção em usinas cooperadas do setor sucroenergético. Esta modelagem considera a relação hierárquica existente entre o planejamento anual da cooperativa e o planejamento tático de safra das usinas cooperadas, além de contemplar importantes incertezas existentes nos parâmetros de entrada do modelo. Para resolver os problemas de programação linear e programação inteira mista envolvidos, utiliza-se uma linguagem de modelagem algébrica e um software de última geração de programação matemática. Os resultados computacionais obtidos são comparados aos resultados da modelagem determinística PASUC, discutida em Paiva e Morabito (in press, utilizando os mesmos dados do estudo de caso da Usina Santa Clotilde e da Cooperativa Regional dos Produtores de Açúcar e Álcool de Alagoas.This work presents a stochastic robust optimization model applied to the aggregate production planning in mill cooperative societies in the sugar-energy sector This mathematical model is based on a hierarchical relationship between the annual planning of the cooperative and the tactical planning horizon of the sugarcane mills taking into account important uncertainties in several parameters of this model. In order to solve the linear and mixed integer programming problems involved, an optimization modeling language solver was used. Computational results are presented and compared with the deterministic approach PASUC, dicussed by Paiva e Morabito (in press using the same data from the case studies conducted in the Santa Clotilde milling company and in the regional cooperative society of sugar and ethanol producers of Alagoas.

  8. MICROMORPHOMETRY OF SOIL AGGREGATES UNDER DIFFERENT RICE CROPS MANAGEMENT SYSTEMS MICROMORFOMETRIA DE AGREGADOS DO SOLO SOB DIFERENTES SISTEMAS DE CULTIVO DE ARROZ

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    Edgard Jardim Rosa Júnior

    2011-07-01

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    Há tempos busca-se um índice para qualificar a estrutura do solo e, nesse sentido, o estudo de imagens digitais de agregados do solo pode ser um caminho promissor. O presente trabalho teve por objetivo caracterizar, micromorfometricamente, os agregados de um Cambissolo Háplico Tb distrófico típico sob a influência de diferentes sistemas de manejo na cultura do arroz. Os sistemas de cultivo foram: convencional com semeadura na água, semeadura realizada em sequeiro e rotacionado com milho e arroz em um ciclo trienal. Os agregados foram coletados nas profundidades de 0-0,20 m, sendo utilizados aqueles retidos no intervalo de diâmetro de 9,52-4,76 mm e 4,76-2,00 mm, com um jogo de peneiras padrão. As análises dos agregados foram realizadas por meio de imagens digitais obtidas via scannerALS 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 ...

  9. Morfologia de agregados de Latossolos Bruno e Vermelho do estado do Paraná, avaliada por imagens obtidas em scanner Morphology of soil structure of the Red-Yellow and Dusky Red Latosols of Paraná State, Brazil, by scanner image analyses

    Directory of Open Access Journals (Sweden)

    Vander de Freitas Melo

    2008-02-01

    Full Text Available A forma e o tamanho das estruturas definem a maioria das características dos solos, principalmente a porosidade total e a distribuição dessa porosidade em macro e microporos. Objetivou-se neste trabalho o estudo da morfologia de diferentes classes de tamanho de agregados de duas toposseqüências de Latossolos (Latossolo Bruno distrófico húmico - LBd e Latossolo Vermelho distroférrico húmico - LVdf, ambos sob condições naturais e originados de rochas basálticas no Paraná, por meio de análise de imagens. Foram coletadas amostras indeformadas de dois horizontes (Bw1 e Bw2 nas toposseqüências do LBd (quatro perfis e do LVdf (três perfis. Após secagem, as amostras foram separadas em seis classes de tamanho de agregados (2-4 mm;1-2 mm; 0,5-1 mm; 0,25-0,5 mm; 0,105-0,25 mm; e The shape and size of aggregates define most soil characteristics, mainly the total porosity and macro and micropore distribution. This study aimed to investigate the morphology of soil aggregates of different size classes of a Red-Yellow (LBd and a Dusky Red Latosol (LVdf located in two respective natural toposequences, in Paraná State, Brazil, using scanner images. Undisturbed soil samples of the Bw1 and Bw2 horizons were collected in four LBd profiles and three profiles of the LVdf toposequence. After drying, the aggregates were separated into six size-classes (2-4 mm; 1-2 mm; 0.5-1 mm; 0.25-0.5 mm; 0.105-0.25 mm; < 0.105 mm, to determine the percentage mass distribution and geometric mean diameter (GMD. Aggregate images of the four coarsest size-classes were scanned and processed by UTHSCSA Image Tool. The aggregate shape of both soils was predominantly polyedric, with high roughness, which supposedly increases the external surface area of aggregates. A higher GMD, aggregate area and perimeter were verified in LBd than in the LVdf samples, especially in the Bw2 horizon. The aggregate roundness increased with the decrease in aggregate size, i.e., smaller

  10. Acercamiento metodológico al estudio de los determinantes contextuales de las enfermedades consecuentes de la aterosclerosis y sus factores de riesgo

    OpenAIRE

    Díaz - Perera Fernández, Georgia María

    2012-01-01

    Bajo el marco conceptual de la Epidemiología, se realizó un estudio descriptivo a nivel individual y agregado de familias de 12 consultorios del médico y la enfermera de la familia en siete policlínicos para describir las variaciones contextuales de la carga de morbilidad y de los factores de riesgo aterosclerótico; evaluar la concentración de la carga de morbilidad y su descomponibilidad con respecto al contexto, evaluar la magnitud de la relación entre la dimensión socioeconómica y la dimen...

  11. Protocolo anexo al Plan de Acción Tutorial de 4º de ESO potenciando la competencia de "Aprender a Aprender" del alumnado

    OpenAIRE

    Martínez Tudela, Elena Isabel

    2014-01-01

    El presente TFM se inicia a raíz de los problemas detectados por el tutor de un grupo de 4º de ESO de su grupo: falta de iniciativa, compromiso y expectativas académicas por parte del alumnado. Estas carencias se podían relacionar con los malos resultados académicos del grupo. Se decide elaborar un Protocolo anexo al Plan de Acción Tutorial de 4º de ESO donde se potencie y afiance la competencia de Aprender a Aprender. Para llevar a cabo el trabajo se sigue la siguiente metodología: Establ...

  12. El trabajo en la marina mercante española en la transición de la vela al vapor (1834-1914)

    OpenAIRE

    Garcia i Domingo, Enric, 1962-

    2013-01-01

    El objeto de estudio es la Marina mercante española (en concreto las tripulaciones) durante la transición de la vela al vapor. El marco cronológico se sitúa entre 1834 (primera línea regular estable con buques de vapor) y 1914 (cuando el proceso de mecanización ya se puede dar por acabado). Aunque con referencias a un marco internacional más amplio, se analiza el caso español focalizando en la marina catalana porque durante el proceso el centro de gravedad de las actividades marítimas estaba ...

  13. Desempenho mecânico de misturas asfálticas confeccionadas com agregados sintéticos de argila calcinada Mechanical performance of asphalt mixtures composed of synthetic calcinated clay aggregates

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    C. A. Frota

    2007-09-01

    Full Text Available Expressivo número de municípios amazonenses se encontra localizado em áreas carentes em agregados pétreos, o que leva os construtores de pavimentos a adotarem alternativas que, em retrospecto histórico, propiciam pavimentos de deficiente resistência mecânica. Conquanto mais eficaz e apropriado do ponto de vista técnico, o concreto betuminoso usinado à quente é normalmente evitado por conta da indicada carência estadual em agregados pétreos. Em face do peculiar contexto amazonense, revela-se recomendável à circunstância em testilha a adoção de agregados sintéticos de argila calcinada (ASAC, com matéria-prima abundante (argila no Amazonas. Trabalhos anteriores, realizados pelo Grupo de Geotecnia da Universidade Federal do Amazonas, demonstram que solos argilosos, costumeiramente empregados para produção de material cerâmico, podem produzir agregados sintéticos com adequadas propriedades mecânicas. Nesta pesquisa, amostras com características similares às desses solos foram encontradas na rodovia BR-319, que liga Manaus (AM a Porto Velho (RO. Trata-se de estrutura, em geral, a ostentar péssimas condições de tráfego, incluída, de maneira justificável, como um dos alvos da política pública de recuperação de rodovias, conduzida pelo Ministério dos Transportes. Neste estudo, dosaram-se misturas asfálticas com agregado sintético e com seixo rolado oriundo do leito dos rios amazonenses, a fim de se comparar o desempenho mecânico de tais misturas por meio da determinação do módulo resiliente (MR. Os resultados, em regra, denotam que as misturas asfálticas confeccionadas com agregado sintético de argila calcinada, quando confrontadas com aquelas confeccionadas com o material natural (seixo, apresentaram: (a maiores resistências à tração e aos módulos resiliente; (b baixa tendência à deformação, assim como uma recuperação elástica considerável e (c menor susceptibilidade às deformações permanentes

  14. Contracción de agregados de Argiudoles de la Pampa Ondulada diferenciados en su mineralogía de arcillas Shrinkage of soil aggregates from rolling Pampa Argiudolls differentiated by their clay mineralogy

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    Mario Guillermo Castiglioni

    2005-07-01

    Full Text Available La contracción y expansión del suelo afecta su comportamiento físico y químico. Mc Garry & Malafant desarrollaron un modelo en el que se separan tres zonas de contracción y a través del cual es posible estimar parámetros que tienen significado físico, siendo estos de utilidad para diferenciar a distintos suelos. El objetivo del presente trabajo fue determinar que propiedades y características de algunos Argiudoles de la Pampa Ondulada, diferenciados en su mineralogía de arcillas, influyen en los parámetros del modelo de expansión-contracción de Mc Garry & Malafant. Con la finalidad de determinar el cambio de volumen específico del suelo, a partir de variaciones en su contenido hídrico, se utilizaron agregados de distintos horizontes de tres suelos no disturbados. Se hicieron análisis de correlación entre los parámetros estimados del modelo de tres líneas con diferentes propiedades y características de los suelos analizados. El distinto comportamiento en el cambio de volumen de los horizontes argílicos con mineralogías contrastantes, fue principalmente a bajos contenidos de agua, mientras que el contenido de arcilla incidió sobre la pendiente de la zona normal de contracción y sobre algunos parámetros del modelo que se estiman a altos contenidos de agua edáfica. Independientemente del tipo de arcilla presente, el punto de entrada de aire de los horizontes argílicos fue registrado a contenidos de agua difíciles de ser hallados a campo. En los horizontes BC y C la acción conjunta de la CIC y del contenido de arcilla mostró una mejor correlación con la pendiente de la zona residual de contracción, respecto al efecto de estos dos parámetros tomados en forma separada. En los horizontes A y BA la CIC resultó ser el mejor estimador de la pendiente residual de contracción. Analizando en forma conjunta el comportamiento de los horizontes A, BA, BC y C, la humedad equivalente y la densidad de partícula fueron las

  15. El pensamiento político barroco español al final de la Historia

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    Tarragó, Rafael E.

    1998-03-01

    Full Text Available Not available.Se propone en este artículo que algunos de los conceptos y teorías propuestos por los publicistas españoles del llamado Siglo de Oro puedan ser útiles en la creación de un proyecto político nuevo, no como objeto de imitación, sino como filones de los cuales sacar enseñanzas. Después de considerar los problemas congénitos del liberalismo y el marxismo, el autor presenta ejemplos sacados de la obra de autores como Juan de Mariana y Diego de Saavedra Fajardo que confrontan temas contemporáneos como la interdependencia de la paz y la justicia, los límites necesarios al poder político para evitar la tiran(a y la importancia de la solidaridad entre gobernantes y gobernados para que una comunidad sea estable.

  16. Entre puertos, campos y acopios: Trabajo y transporte de granos en torno al Sudeste bonaerense.

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    Paula Tagliabue

    2014-12-01

    Full Text Available En este artículo, se analiza el proceso de trabajo en el transporte automotor de granos en torno al sudeste bonaerense. Desde un abordaje cualitativo, se describen y analizan las prácticas durante la cosecha y pos-cosecha, y los trayectos campo-acopio, acopio-puerto. También se analizan las relaciones laborales a partir de una perspectiva ampliada de las relaciones laborales clásicas (asalariadas, estables, protegidas.Los rasgos que asume el trabajo en el transporte de granos están asociados a los cambios técnicos y tecnológicos de la producción de granos, así como a procesos de flexibilización laboral, vinculados a la disponibilidad permanente para fletar, la extensión de la jornada laboral y la intensidad del trabajo camionero.

  17. ¿Qué enseñamos en Educación Física en relación al género y la sexualidad?

    OpenAIRE

    Di Gregorio, Marcela Judith

    2013-01-01

    La clase de Educación Física se constituye en un espacio de intercambio que propone un accionar sistemático sobre la corporeidad y motricidad de los sujetos, construyendo, a su vez, subjetividad. La vieja escuela media instaló una Educación Física para varones y una Educación Física para mujeres al conformar grupos en base a un criterio estable como el sexo, respondiendo a viejos paradigmas relacionados con el alto rendimiento y el modelo bio-médico, donde lo femenino y lo masculino se presen...

  18. Efectos del agregado de cachaza y de diferentes densidades de plantación en la capacidad productiva de un semillero saneado de la variedad de caña de azúcar (Saccharum spp. LCP85-384 Effects of filter cake incorporation and different planting densities on the productive capacity of a healthy LCP85-384 sugarcane variety (Saccharum spp. nursery

    Directory of Open Access Journals (Sweden)

    María I. Cuenya

    2007-06-01

    Full Text Available El alto valor agregado de la semilla saneada de caña de azúcar exige la implementación de diversos manejos culturales que potencien al máximo la productividad de los semilleros. Este trabajo evalúa diferentes alternativas de manejo en la plantación de semilla saneada por termoterapia de la variedad LCP85-384, combinando distintas densidades de yemas con el agregado o no de cachaza en la base del surco. Se implantó un ensayo en Parcelas Divididas con tres repeticiones. Las parcelas principales contemplaron el agregado o no de cachaza. Las subparcelas comprendieron las siguientes densidades de plantación por metro lineal de surco: tres, seis y nueve yemas uninodales; dos y tres trozos de tres yemas cada uno (2 x 3Y y 3 x 3Y, respectivamente y un tallo cortado al medio (8 a 10 yemas. En caña planta y soca 1 se evaluaron número de tallos/parcela, altura promedio de tallos, número de yemas/m lineal del tallo y número de yemas/parcela. Se efectuaron análisis de la varianza y pruebas de comparación de medias (DLS de Fisher. Se detectaron diferencias altamente significativas entre los subtratamientos con respecto al número total de tallos/parcela (caña planta y soca 1 y a la altura promedio de tallos (caña planta. Para ambas variables y en las dos edades de corte, los mayores valores se registraron para los subtratamientos que involucraron trozos de caña y los menores valores para aquellos originados de yemas individuales. Para el número total de yemas/parcela, producidas durante los dos años, se detectaron diferencias altamente significativas entre tratamientos principales y entre subtratamientos. Para esta última variable, de interés en un semillero con dos años de aprovechamiento, el subtratamiento de 3 x 3Y resultó la mejor alternativa de plantación, presentando diferencias significativas con el resto de las densidades ensayadas. La aplicación de cachaza en plantación resultó ventajosa cuando se consideró el

  19. Metodología para la estimación del Valor Agregado del mantenimiento predictivo en la Industria Cubana. // Methodology for the estimate of Added Value of the predictive maintenance in Cuban Industry.

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    O. Inastrilla Armayor

    2004-05-01

    Full Text Available En el trabajo se expone una metodología general para la determinación de ciertos coeficientes que permiten estimar el valoragregado por concepto de la aplicación del mantenimiento predictivo en un grupo de máquinas agrupadas según su función.A partir de aquí el usuario será capaz de estimar los beneficios a corto plazo por la aplicación de este tipo demantenimiento.Palabras claves: Metodología valor agregado, mantenimiento predictivo, diagnóstico por vibraciones.______________________________________________________________________________Abstract.In the work a general methodology is exposed for the determination of certain coefficients that allow toestimate the value added by concept of the application of the predictive maintenance in a group of machinescontained according to its function. Starting from here the user will be able to estimate the short termbenefits for the application of this type of maintenance.Key words: Dumbwaiter, structures, stress analysis, finite elements.

  1. Armonización fiscal e imposición subnacional a las ventas-impuesto estadual/provincial al valor agregado versus impuesto estadual/provincial a las ventas minoristas

    OpenAIRE

    Piffano, Horacio Luis Pablo

    2007-01-01

    El trabajo explora las posibilidades de armonización de la imposición dual a las ventas en Argentina y Brasil, haciendo un repaso de las alternativas mayormente sugeridas en la literatura específica, a saber: el combinar un IVA Federal con un IVA Provincial, o bien, con un IVM Provincial. Luego se analizan las posibilidades técnicas que tendría una reformas de este tipo de imposición en ambas federaciones, para finalmente identificar combinaciones similares que permitirán un grado importante ...

  2. Agregado de valor al fruto de Prosopis alba : Estudio de la composición química y nutricional para su aplicación en bocaditos dulces saludables

    OpenAIRE

    Sciammaro, Leonardo Pablo; Ferrero, Cristina; Puppo, María Cecilia

    2015-01-01

    El objetivo de este trabajo fue estudiar la calidad química y nutricional de harinas de vaina y pulpa del fruto de algarrobo y su aplicación como agente aglutinante en la formulación de bocaditos dulces a base de semillas andinas (quinua, amaranto y chía). Se realizó un diseño de mezclas manteniendo constante la proporción de semillas y en el que se variaron los tres ingredientes considerados como aglutinantes y endulzantes: harina de algarroba, azúcar y miel. El diseño fue sometido a una res...

  3. El valor agregado de las redes sociales : propuesta metodológica para el análisis del capital social

    OpenAIRE

    Velázquez, Alejandro

    2007-01-01

    En el presente trabajo se utiliza una variable reticular para estratificar un grupo de actores sociales, lo cual permite exhibir la posición estructural de sus integrantes en base al origen de su capital social. Se utiliza la variable constricción debido a que integra en una sola medida las dos fuentes principales de capital social: cierre e intermediación. Este enfoque, permite generar hipótesis inmediatas sobre los mecanismos subyacentes a la Posición estructural que actualmente posee cada ...

  4. El Principio "agregados con enclaves" en el pensamiento territorial sostenibilista análisis de cinco paisajes de Cataluña /

    OpenAIRE

    Aran Guiu, Domènec

    2008-01-01

    En la presente investigación, se ha testado un principio conceptual proveniente de la Ecología del Paisaje ('Aggregated with Outliers' -AWO; Richard T. Forman 1995), que trata sobre las configuraciones universales del paisaje requeridas, de cara al mantenimiento de las funcionalidades ecológicas del mismo y que permitan la ordenación de los usos y actividades humanas de forma sostenible. Como interés principal está el análisis territorial desde una perspectiva integrada (holística), y puede s...

  5. Análisis de los estudios clínicos sobre la eficacia de las técnicas alternativas al formocresol en las pulpotomías de dientes temporales Analysis of clinical studies on the effectiveness of alternatives to formocresol in primary tooth pulpotomies

    OpenAIRE

    J Calatayud; I. Casado; Álvarez, C.

    2006-01-01

    Después de analizar los estudios clínicos de las técnicas de pulpotomía en dientes temporales alternativas al formocresol: hidróxido de calcio, electrocoagulación, glutaraldehido, sulfato férrico y Mineral Trióxido Agregado (MTA), hemos llegado a la conclusión de que las tres últimas son las mejores alternativas por presentar los mejores resultados y tener menor número de fracasos a lo largo del tiempo. En general todas tienden a empeorar sus resultados a medida que pasa el tiempo, desde un é...

  6. ASPECTOS TEÓRICOS Y PRÁCTICOS DE LA POLÍTICA MONETARIA

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    Norberto Zúñiga F.

    2011-09-01

    Full Text Available La estrategia de política monetaria dominante en los últimos años en Costa Rica, se caracteriza por el uso de una variable intermedia –usualmente un agregado monetario-. Esto lo que significa es que para alcanzar las metas finales (inflación, las autoridades monetarias tratan de darle seguimiento a las variables monetarias. De acuerdo con este enfoque cuando estas variables se aceleran más allá de lo programado por el Banco Central, ello se reflejará en mayores niveles de inflación.Este esquema, que ha sido aplicado en muchos países, requiere que se cumplan algunas condiciones para funcionar adecuadamente. Las más importantes son: i estabilidad de la demanda de dinero del agregado seleccionado; ii un alto grado de controlabilidad de dicho agregado por parte del banco central; y iii la existencia de una relación estable, estrecha y predecible entre el agregado monetario y al objetivo final de política, cuya causalidad va del primero (variable intermedia al último (variable objetiva.El proceso de desregulación y el continuo surgimiento de innovaciones financieras han puesto en entredicho el cumplimiento de estas condiciones, razón por la cual varios países han empezado a utilizar procedimientos alternativos. Uno de los enfoques que ha ido ganando importancia es el denominado “direct inflation targeting”, el cual, como su nombre lo indica, consiste en controlar directamente la inflación, sin emplear ninguna variable intermedia específica, sino más bien un conjunto de indicadores. Una de las ventajas de ese enfoque es el reconocimiento de que la inflación es un fenómeno complejo que, al menos en el corto plazo, no es directamente controlable por el Banco Central y que depende de muchos factores internos y externos.

  7. Formação e estabilização de agregados do solo decorrentes da adição de compostos orgânicos com diferentes características hidrofóbicas Soil aggregate formation and stabilization as influenced by organic compounds with different hydrophobic characteristics

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    Renato Saldanha Bastos

    2005-02-01

    Full Text Available Substâncias orgânicas podem favorecer o aumento da estabilidade de agregados, reduzindo, de acordo com seu grau de hidrofobicidade, a velocidade de infiltração de água nos agregados. Este trabalho teve como objetivo estudar a formação e estabilização de agregados de um Latossolo Vermelho-Amarelo distrófico em virtude da adição de compostos orgânicos com características hidrofóbicas e hidrofílicas distintas. Foram incubados 100 g de TFSA do horizonte A e do B com diferentes doses de três compostos orgânicos: ácido esteárico P.A., amido P.A. e ácido húmico purificado de acordo com a Sociedade Internacional de Substâncias Húmicas. O experimento foi realizado com os tratamentos gerados de acordo com a matriz Plan-Puebla III modificada, com as doses do espaço experimental variando de -0,55 a 10,45 g kg-1. Após o período de 160 dias de incubação, avaliaram-se: o índice de estabilidade de agregados, o diâmetro médio ponderado e o diâmetro médio geométrico dos agregados formados. Os resultados indicaram que compostos orgânicos com caráter hidrofílico dominante não têm influência na formação e estabilização de agregados do solo, principalmente quando se usam doses até 9,9 g kg-1. Observou-se, também, que a aplicação de moléculas orgânicas com acentuado caráter hidrofóbico e hidrofílico na sua estrutura, como os ácidos húmicos, é capaz de melhorar a agregação de solos com grau de intemperismo avançado.According to their hydrophobicity degree, organic substances can increase the aggregate stability, reducing the rate of water infiltration into the aggregates. Our study investigated the aggregate genesis and stabilization in a Red-Yellow Latosol under organic compound addition with distinct hydrophobic and hydrophilic characteristics. Air-dried samples from the A and B horizons were incubated with different doses of three organic compounds: estearic acid, amid and humic acid purified in accordance

  8. AL Amyloidosis

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    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

  9. Características dos agregados de solo podzólico vermelho amarelo da Estação Experimental de Monte Alegre do Sul Aggregate characteristics of a yellow-red podzolic of the Experiment Station of Monte Alegre do Sul

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    J. Bertoldo de Oliveira

    1966-01-01

    Full Text Available Procurou-se analisar as características físico-químicas dos agregados de amostras de solo provenientes de três parcelas: cultura de milho, pomar de frutas de clima temperado e eucalipto. No laboratório foram efetuadas as seguintes determinações: granulometria, pH, C e N totais; Ca++, Mg+ + e K+ trocáveis e capacidade de troca de cations. A variação dos teores dos elementos nas diferentes classes de tamanho de agregados dos solos analisados não foi muito grande. De maneira geral, os agregados da parcela "milho" apresentaram os mais baixos níveis de elementos. Pequenas diferenças apresentaram as duas parcelas - "pomar" e "eucalipto". A soma das bases trocáveis e a capacidade de troca de cations parecem estar intimamente relacionadas com os valores de matéria orgânica, mostrando a importância dêsse constituinte do solo.An attempt was made to analyse the physico-chemical characteristics of soil sample aggregates proceeding from three different areas: corn growing-plots, orchards of fruits of temperate climate and eucalyptus groves. In the laboratory the following determinations were carried out: granulometric, pH, C and N totais, Ca++, Mg++ and K+ exchangeable and capacity of cation exchange. The variation of element contents was not very large in the different classes of size of the aggregates of the analysed soils. Ina general way, the aggregates of the "corn" area presented the lowest levels of the analysed elements whereas the other two, "orchards and encalyptus plots", showed quite immaterial differences. The sum of exchangeable bases and the capacity for cation exchange seems to be intimately related to the values of organic matter, thus showing the importance of this soil constituent.

  10. Estabilidade dos agregados e sua relação com o teor de carbono orgânico num latossolo roxo distrófico, em função de sistemas de plantio, rotações de culturas e métodos de preparo das amostras

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    C. Castro Filho

    1998-09-01

    Full Text Available O tamanho dos agregados do solo e o estado de agregação podem ser influenciados por diferentes processos de manejo e práticas culturais que alteram o teor de matéria orgânica e a atividade biológica do solo. O objetivo do trabalho foi verificar as relações entre o teor de C-orgânico e o tamanho e estabilidade dos agregados do solo em dois sistemas de plantio (convencional e direto e três rotações de culturas (milho/trigo/milho, soja/trigo/milho e soja/trigo/soja, submetendo-se as amostras a dois processos de preparo: uso das peneiras de 4 e 8 mm antes do tamisamento úmido. O trabalho foi executado em 1990, usando-se amostras de solo, coletadas num experimento com 14 anos de duração, localizado em Londrina, PR, num Latossolo Roxo (Typic Haplorthox. As amostras de solo foram coletadas em 5 de abril de 1990, em duas profundidades: 0-10 e 10-20 cm. Os índices de agregação determinados foram: o diâmetro médio ponderado (DMP, o diâmetro médio geométrico (DMG e o índice de estabilidade de agregados (IEA. Os resultados mostraram que o sistema de plantio direto melhorou o estado de agregação do solo com o incremento do teor de C-orgânico, sobretudo na camada de 0-10 cm, onde os valores de DMP e DMG foram significativamente superiores. A agregação tendeu a aumentar quando a sucessão de culturas incluiu espécie de relação C/N mais alta (milho. O aumento do teor de C-orgânico resultou em aumento do IEA pela diminuição de agregados das classes com diâmetro < 0,25 mm e aumento das classes de diâmetro maior. Os métodos de preparo das amostras produziram diferenças na agregação do solo, tendo o preparo com peneira 8 mm melhorado a sensibilidade para determinar o estado de agregação em função dos processos de manejo.

  11. Avaliação das propriedades físicas e mecânicas de concretos produzidos com vidro cominuído como agregado fino Evaluation of physical and mechanical properties of concretes produced with ground waste glass as fine aggregate

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    D. A. R López; C. A. P. de Azevedo; E. Barbosa Neto

    2005-01-01

    O presente trabalho insere-se na proposta da utilização racional dos recursos naturais não renováveis. Ele tem por objetivo, estudar a viabilidade técnica da utilização de vidro não reciclado como material agregado ao concreto, especificamente pela comparação das propriedades mecânicas de concretos fabricados com o novo componente, visando a sua utilização para fins estruturais. A comparação foi realizada por meio do estudo das propriedades mecânicas de concretos produzidos primeiramente com ...

  12. Elaboración de Panes con Agregado de Harina de Arroz Integral y Modelación de sus Atributos Sensoriales a Través de la Metodología de Superficie de Respuesta Elaboration Bread with Added Rice Flour and Modeling of Sensory Attributes Through Response Surface Methodology

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    Armando Alvis; Luis Pérez; Guillermo Arrazola

    2011-01-01

    Se estudió la elaboración de pan con agregado de harina de arroz integral a través de 17 formulas experimentales. Esto con el objetivo de encontrar una formulación para la producción de pan que presente mejores propiedades físicas y sensoriales y mejor calidad nutricional. La panificación se llevó a cabo con la hidratación necesaria para mantener la mezcla batida a consistencia constante. Los panes fueron evaluados por sus atributos sensoriales a través de un panel entrenado y el análisis se ...

  13. Hipercoagulabilidad y daño endotelial en pacientes con enfermedad pulmonar obstructiva crónica en fase estable Hypercoagulability state and endotelial injury in stable chronic obstructive pulmonary disease patients

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    M. A. Aibar

    2010-04-01

    Full Text Available La enfermedad pulmonar obstructiva crónica es en la actualidad la cuarta causa de muerte en nuestro país. El principal agente causal de la enfermedad es el tabaco, cuyos efectos sobre el árbol bronquial no se limitan al parénquima pulmonar sino que además lesionan la pared endotelial, lo que podría contribuir a la aparición de trombosis, isquemia o hipertensión pulmonar. En nuestro trabajo se estudia la existencia de un estado protrombótico en estos pacientes caracterizado por la activación de la coagulación y por el daño endotelial y, para ello, se comparan las cifras de marcadores bioquímicos en enfermos con EPOC y en sujetos sanos. Se seleccionaron 51 pacientes con EPOC y un grupo de 30 voluntarios sanos de edades similares y se compararon las cifras de fibrinógeno, D-dímero, factor VIII y factor von Willebrand (FvW:Ag y FvW:Rico. Se observó un aumento de todos los marcadores en el grupo de pacientes con respecto al grupo de controles sanos. Las diferencias encontradas fueron estadísticamente significativas en todos los casos (pCOPD is currently the fourth cause of death in our country; the main causal agent of the disease is tobacco whose effects on the bronchial tree are not limited to the lung parenchyma. The action of tobacco injures the endothelial wall, which could contribute to lung thrombosis, ischemic events or secondary pulmonary hypertension. Our work investigates the existence of a prothombotic state in these patients, characterized by the activation of clotting and endothelial injury, comparing the values of biochemical markers between COPD patients and healthy volunteers. Fifty-one patients with COPD and a group of 30 healthy volunteers of similar ages were selected and fibrinogen, D-dimer, factor VIII and von Willebrand factor (FvW:Ag and FvW:Rico levels were compared. We found an increase of all markers in the patient group compared to the healthy control group. The differences found were statistically

  14. In vitro biocompatibility tests of two commercial types of mineral trioxide aggregate Testes de biocompatibilidade in vitro de duas formas comerciais do agregado de trióxido mineral

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    Daniel Araki Ribeiro

    2005-09-01

    Full Text Available Recently, regular and white mineral trioxide aggregate (MTA are being used in Dentistry as retrofilling materials. Genotoxicity and cytotoxicity tests form an important part of cancer research and risk assessment of potential carcinogens. Thus, the goal of this study was to examine the genotoxicity and cytotoxicity of regular and white MTA in vitro by the single cell gel (comet assay and trypan blue exclusion test, respectively. Mouse lymphoma cells were exposed to two presentation forms of MTA at final concentrations ranging from 1 to 1,000 µg/mL for 3 h at 37°C. The results showed that both compounds tested did not produce genotoxic effects at all concentrations evaluated. Likewise, no statistically significant differences (p > 0.05 were observed in cytotoxicity. Taken together, our results suggest that regular and white MTA are not genotoxins and are not able to interfere in cellular viability as assessed by single cell gel (comet assay and trypan blue assay, respectively.Recentemente, o agregado de trióxido mineral (MTA regular e branco estão sendo utilizados na Odontologia como materiais para obturação retrógrada de canais radiculares. Testes de genotoxicidade e citotoxicidade formam uma importante parte da pesquisa do câncer e da avaliação de risco de carcinógenos potenciais. Assim, o objetivo deste estudo foi examinar a genotoxicidade e citotoxicidade do MTA branco e regular in vitro pelo teste do cometa e teste de exclusão pelo azul de tripan, respectivamente. Células do linfoma murino foram expostas às duas formas de apresentação do MTA nas concentrações finais de 1 a 1.000 µg/mL por 3 horas a 37°C. Os resultados mostraram que ambos os compostos testados não produziram efeito genotóxico em todas as concentrações testadas. Da mesma forma, nenhuma diferença estatisticamente significativa (p > 0,05 foi observada na citotoxicidade. Em suma, nossos resultados sugerem que o MTA regular e branco não são genotoxinas e

  15. Riscos isolados e agregados de anemia em crianças frequentadoras de berçários de creches Isolated and combined risks for anemia in children attending the nurseries of daycare centers

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    Tulio Konstantyner

    2009-06-01

    Full Text Available OBJETIVO: Identificar e quantificar os fatores de risco isolados e agregados de anemia, proporcionando visão ampliada quanto à probabilidade da sua ocorrência. MÉTODOS: Estudo transversal com 482 crianças, entre 4 e 29 meses de idade, frequentadoras de berçários de creches públicas e filantrópicas do município de São Paulo (SP, que participaram de dois inquéritos (2004 e 2007. Foram realizadas entrevistas com as mães, coleta de sangue por punção digital e antropometria. Considerou-se anemia, hemoglobina inferior a 11 g/dL. Foi ajustado modelo de regressão logística não-condicional para fatores de risco de anemia, considerando-se estatisticamente significantes associações com p OBJECTIVE: To identify and quantify isolated and combined risk factors for anemia, providing a comprehensive view of the likelihood of its occurrence. METHODS: Cross-sectional study with 482 children aged 4 to 29 months attending the nurseries of philanthropic and public daycare centers in the city of São Paulo, Brazil, who participated in two surveys (2004 and 2007. Mothers were interviewed, blood was collected using digital puncture, and anthropometry was performed. Anemia was characterized by hemoglobin levels below 11 g/dL. Unconditional logistic regression was adjusted for anemia risk factors. A value of p < 0.05 indicated statistically significant associations. Post-test odds and likelihood ratios were calculated to define post-test probabilities. Epi-InfoTM 2000 and Stata 10.0 software packages were used for statistical analysis. RESULTS: Prevalence of anemia was 43.6% (95%CI 39.1-48.1. The final logistic model included five categorical variables: mother's age less than 28 years (OR = 1.50; p = 0.041, per capita income below half a minimum wage (OR = 1.56; p = 0.029, exclusive breastfeeding less than 2 months (OR = 1.71; p = 0.009, decrease in weight/age z score from birth to survey (OR = 1.47; p = 0.050, and age less than 17 months (OR = 2

  16. Atributos químicos e estabilidade de agregados sob diferentes culturas de cobertura em Latossolo do cerrado Chemical properties and aggregate stability under different cover crops in cerrado Oxisol

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    Glenio G. Santos

    2012-11-01

    Full Text Available Objetivou-se, com este trabalho, avaliar o efeito de diferentes culturas de cobertura sobre os atributos químicos e a estabilidade de agregados de um Latossolo do cerrado, sob plantio direto. O estudo foi conduzido em área experimental na Embrapa Arroz e Feijão, em Santo Antônio de Goiás, GO. As culturas de cobertura avaliadas foram: braquiária, milho em consórcio com braquiária (integração lavoura-pecuária, guandu anão, milheto, capim mombaça, sorgo granífero, estilosantes e crotalária. As amostras foram coletadas em abril de 2005 e 2006. O delineamento experimental foi o de blocos completos ao acaso com quatro repetições e os tratamentos arranjados em esquema fatorial 8 x 2, sendo oito culturas de cobertura e duas profundidades de amostragem do solo: 0-0,10 e 0,10-0,20 m. As culturas de cobertura influenciam, de forma diferenciada, os valores de pH e os teores de cálcio, magnésio, alumínio, fósforo, potássio, cobre, zinco e ferro do solo. O tratamento estilosantes tem maior poder em acidificar o solo. A agregação do solo varia com as culturas de cobertura e com a profundidade.The objective of this study was to evaluate the effect of different cover crops on chemical properties and aggregate stability in a cerrado Oxisol under no-tillage. The study was carried out in Embrapa Rice and Beans, in Santo Antônio de Goiás, GO, Brazil. The cover crops evaluated were: Urochloa brizantha, Urochloa brizantha and corn in association (crop-livestock integrated, Cajanus cajan, Pennisetum glaucum, Panicum maximum, Sorghum bicolor, Stylosanthes guianensis and Crotalaria juncea. The soil samples were collected in April and September 2005 and April 2006. The experimental design was in completely randomized blocks with four replications and treatments arranged in factorial scheme 8 x 2, eight cover crops and two soil sampling depths, 0-0.10 and 0.10-0.20 m. The different cover crops affect pH values and calcium, magnesium, aluminum

  17. ESTUDIOS DE ISÓTOPOS ESTABLES EN HUERTAS FAMILIARES ACTUALES DE LA QUEBRADA DE HUMAHUACA (JUJUY, ARGENTINA. SU POTENCIAL APORTE A LOS ESTUDIOS PALEODIETARIOS DEL NOROESTE ARGENTINO / Stable isotope studies on current home gardens of the Quebrada de ...

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    Violeta A. Killian Galván

    2015-12-01

    Full Text Available Presentamos una propuesta metodológica para la generación de marcos de referencia en los estudios paleodietarios, mediante el análisis de la composición isotópica del carbono y el nitrógeno (?13C y ?15N en arqueología. En particular, nos centraremos en cómo influyen algunas prácticas de cultivo en los valores isotópicos de las plantas procedentes de huertas familiares (siendo las especies escogidas Zea mays, Solanum tuberosum, Oxalis tuberosa, Ullucus tuberosus, Chenopodium quinoa y Opuntia ficus-indica, esta última como especie silvestre del área. La metodología propuesta consiste en: el relevamiento de información entre productores locales, la caracterización del suelo en cuanto a sus propiedades químicas (pH, conductividad eléctrica, carbono orgánico y nitratos y la medición isotópica de los vegetales muestreados. A partir de los resultados obtenidos, podemos afirmar que al menos en entornos semiáridos, como es el caso de Quebrada de Humahuaca, la disponibilidad de nutrientes en el suelo repercute en los valores ?15N de Zea mays. Si bien no hay una relación lineal entre las variables propuestas y los resultados isotópicos obtenidos, se registró un rango más amplio de valores cuando la calidad del suelo fue menor. AbstractWe present a methodological proposal for the construction of a frame of reference in paleodietary research through the analysis of Carbon and Nitrogen stable isotopes (?13C y ?15N in archaeology. In particular, we focus on the effect of certain harvest practices in the isotopic values of plants from family farms (the species chosen being Zea mays, Solanum tuberosum, Amaranthus caudatus, Chenopodium quinoa and Opuntia ficus-indica, this last as a wild plant from the area. The methodology consist in: collection of information among local producers, soil characterization in terms of their chemical properties (Ph, electrical conductivity, organic carbon and nitrate and analysis of isotopic values from

  18. COSTA RICA: ELEMENTOS PARA UNA ESTRATEGIA DE POSICIONAMIENTO HACIA EL DESARROLLO (De cara al TLC y al neoliberalismo

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    Henry Mora Jiménez

    2006-07-01

    Full Text Available Costa Rica, económicamente hablando, no es un país pequeño, es un país diminuto. Por eso, toda estrategia de desarrollo económico1 que se enmarque en un determinado proyecto político de país, debe ser una estrategia de desarrollo “hacia fuera”, es decir, en amplia interacción (comercial, financiera, tecnológica y de cooperación, con otras economías nacionales, regionales y al nivel mundial. En este plano, y de cara a la formulación de una estrategia de desarrollo, no hay otra alternativa.“Desde adentro”, porque esa integración (inserción debe sustentarse en un desarrollo articulado de la economía nacional y de su tejido empresarial y productivo. Articulación significa,en este nivel, generación, apropiación y (redistribución interna de un alto valor agregado, con la creación de encadenamientos productivos y de empleos de calidad; muy al contrario de losenclaves de plantación, industriales y de exportación que han sido la norma durante toda nuestra historia como país formalmente independiente (modelo agroexportador, modelo desustitución de importaciones, modelo importadormaquilador-exportador.“Desde abajo”, porque tiene que traducirse en un desarrollo no excluyente (desarrollo inclusivo, en la construcción de una sociedad donde quepamos todos y todas, sin dejar por fuera en esta inclusión a la naturaleza (desarrollo ambientalmentesustentable. No se trata de crecer para luego distribuir, sino que la propia racionalidad económica del proyecto transformador debe ser inclusiva (ser humano y naturaleza.

  19. Residualidad del ácido sulfúrico aplicado como enmienda, y calculado de acuerdo con la CIC y con la suma de bases, sobre la estabilidad de los agregados en dos suelos salino-sódicos de la zona de Palmaseca, Valle del Cauca Residualidad del acido sulfúrico aplicado como enmienda, y calculado de acuerdo con la c 1c y con la suma de bases, sobre la estabilidad de los agregados en dos suelos salino-sódicos de la zona de palma seca, Valle del Cauca

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    Charry Calle Jairo

    1988-12-01

    Full Text Available Los dos suelos salino-sódicos se cultivaron sucesivamente con algodón (Gossypium hirsutum var. Gossica P-21, soya (Glycine max var. ICA- Tunía y fríjol (Phaseolus vulgaris var. ICA- Gualí. La estabilidad de los agregados para los suelos, tratamientos y cultivos, se comparó calculando el área localizada debajo de cada una de las curvas aditivas porcentuales de los agregados, entre los parámetros menor de 025 mm y 0.42-0.84 mm.Residuality of sulfuric acid applied as amendment and calculated according to CEC and Sum of Exchangeable Bases (Ca, Mg, Na and K on the aggregate stability of two saline-sodic soils from Palmaseca zone , Cauca Valley, successively cultivated in cotton (Gossypium hirsutum var. Gossica P- 211. soybean (Glycine max var. ICA Tunía and bean (Phaseolus vulgaris var. ICA-Gualí was studied. The aggregate stability for two soils, treatments and crops, was compared by calculating the area located below each one of the accumulative percentage curves of aggregates, between less than 025 mm and 0.42-084 mm parameters. The results showed: A percent increase up to 56% in the aggregate stability of both soils, in treatments calculated according to CEC cultivated in soybean, and Sum of Exchangeable Bases cultivated in bean. The characteristic roots do not have a pronounced effect on aggregation. The initial and final chemical analysis of soils cultivated in cotton, bean and soybean showed in general, a 90 to 98% reductions of levels of sulphate, exchangeable sodium and exchangeable sodium percentage.

  20. Destino del nitrógeno agregado por fertilización en un cultivo de papa en los andes de Venezuela Fate of applied nitrogen by fertilization in a potato crop of the Venezuelan andes

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    Z Abreu

    2007-06-01

    Full Text Available Se analizó el destino del N agregado por fertilización mineral en una parcela de papa cultivada con 288 kg ha-1 de N marcado (15N en los páramos venezolanos y se comparó con el balance de N de una parcela sin fertilizar. Se realizaron dos muestreos, a los 91 y 189 días después de la siembra, evaluándose el N total y marcado en la planta y en tres capas de suelo (0-10, 10-20 y 20-30 cm, considerando el N mineral (NH4+ y NO3-, el N de la biomasa microbiana y el N total del suelo. Además, se instalaron lisímetros para cuantificar las pérdidas de N por lixiviación. La producción de tubérculos fue de 14,5 t ha-1 en la parcela fertilizada y de 1,2 t ha-1 en la testigo, evidenciando la baja fertilidad intrínseca de los suelos. En la parcela fertilizada, en el primer muestreo, 16% del N agregado se encontraba en la biomasa del cultivo, 76% en el suelo, 3% se había perdido por lixiviación y 5% no fue detectado. En el segundo muestreo 23% del N aplicado se encontraba en la biomasa del cultivo, 39% en el suelo, 6% se había perdido por lixiviación y el 32% faltante no fue detectado y se atribuye a pérdidas gaseosas. El N del fertilizante representó 69% del N total absorbido por el cultivo, indicando la baja disponibilidad de N nativo, a pesar de la gran cantidad de N orgánico presente en el suelo. El 10% del fertilizante marcado fue inmovilizado por la biomasa microbiana durante el primer muestreo, disminuyendo a 7% durante el segundo muestreo. En el primer muestreo predominó el NH4+ como forma mineral mientras que en el segundo fue más abundante el NO3-, evidenciándose el proceso de nitrificación que pudo haber favorecido las pérdidas gaseosas.The fate of nitrogen added by mineral fertilization was analyzed in a potato plot cultivated using 288 kg ha-1 of labeled N (15N in the Venezuelan Moorlands and was compared to the N budged of an unfertilized plot. Two samplings were carried out, 91 and 189 days after planting. The total and

  1. Comportamiento legislativo en México: Una aproximación al enfoque de Representación en la Cámara de Diputados

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    Luis Antonio González Tule

    2015-01-01

    Full Text Available El objetivo principal de este trabajo es identificar el tipo de representación en la Cámara de Diputados y proponer explicaciones al enfoque que presentan sus integrantes en los proyectos de ley que impulsan. Se parte de la hipótesis que los legisladores defienden intereses agregados a nivel nacional y no local porque la dirigencia partidista cuenta con los instrumentos necesarios para mantener el control de la agenda legislativa. Dentro de éstos destacan 1 el sistema de representación proporcional de listas cerradas y el monopolio en la nominación de los candidatos, 2 la no reelección consecutiva y 3 las reglas que regulan la dinámica interna del Congreso.

  2. Utilização de massas cerâmicas na produção de agregado sintético de argila calcinada para uso em concreto Use of ceramic bodies in the production of synthetic aggregate calcined clay for use in concrete

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    E. M. Cabral

    2008-12-01

    Full Text Available A região amazônica, pela sua formação geológica, não dispõe de rochas de fácil acesso para uso na construção civil; devido a isto, o seixo rolado é obtido da dragagem do leito dos rios, sendo o agregado graúdo comercialmente mais utilizado para a produção de concreto. Neste trabalho é apresentado um estudo das características e propriedades tecnológicas de duas massas cerâmicas utilizadas para produção de tijolo, oriundas das cidades de Iranduba e Manacapuru, AM, com a finalidade de se fabricar agregado sintético de argila calcinada para uso em concreto. As massas cerâmicas foram submetidas a ensaios de difração de raios X, determinação de composição química e de distribuição do tamanho das partículas, e plasticidade. Foram confeccionados corpos-de-prova por prensagem uniaxial a 20 MPa para a queima nas temperaturas de 850, 950, 1050, 1150 ºC, sendo as propriedades tecnológicas após queima avaliadas por retração linear, absorção de água, massa específica aparente, massa unitária e temperatura de gresificação. A massa cerâmica que apresentou menor massa específica aparente e o menor percentual de umidade de moldagem foi escolhida como matéria-prima para a fabricação do agregado sintético de argila calcinada. Esse agregado foi usado em substituição ao agregado natural da região amazônica, o seixo rolado, em concreto estrutural.The amazonic region is geologically mainly composed by sedimentary rocks; by consequence, it is difficult to obtain igneous rocks to use in concrete. Hence, the natural gravel produced by the weathering action of running water on the beds and banks of streams is largely used. Nowadays, the substitution of natural gravel by an aggregate whose production minimizes the environmental impact has been a theme of research. This work presents a study of the characteristics and technological properties of two ceramic pastes from Iranduba and Manacapuru. AM, with the purpose of

  3. Estabilidad, morfología y rugosidad de agregados de argiudoles típicos sometidos a distintos usos: su rol como indicadores de calidad física en suelos de la provincia de Buenos Aires, Argentina Stability, morphology and roughness of aggregates of typical argiudolls under diferent types of land uses: their role as indicators of soils physical quality in Buenos Aires province, Argentina

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    M Fernanda Alvarez

    2008-12-01

    Full Text Available En los últimos diez años se observó un importante cambio en el uso de la tierra en la llanura pampeana, lo cual ha llevado a una marcada degradación de los suelos. El objetivo del trabajo fue evaluar la estabilidad, la morfología y la rugosidad de distintos tamaños de agregados como indicadores de calidad en Argiudoles Típicos del sudeste bonaerense sometidos a distintos usos de suelo y a distintas intensidades de manejo. Se trabajó con el epipedón mólico de parcelas con distinto uso de suelo: cultivadas, forestadas y naturales. Los resultados mostraron mayor estabilidad en los suelos no laboreados y en los forestados de más de treinta años. En los sitios cultivados y forestados se observaron agregados alargados, cuadrangulares y esféricos, mientras que en los sitios sin laboreo no se presentaron las formas esféricas. La rugosidad de los agregados fue mayor en los suelos sin laboreo, si bien ello varió con el tamaño de los agregados. La estabilidad, morfología y rugosidad de agregados demostraron ser buenos indicadores de calidad de suelos del SE bonaerense.During the last ten years, an important land use change took place in the Pampas region of Argentina. This change led to a significant soil degradation. This work aims to evaluate the stability, morphology and roughness of soil aggregates in soils under different land uses. The values found for each land use could serve as soil quality indicators in southeastern Buenos Aires. Samples were taken from mollic epipedons under cultivated, forest and natural soils. Results showed higher aggregate stability in virgin and forest soils than in cultivated soils. Aggregates were elongated, quadrangular and spherical in cultivated and forest soils. Aggregates from non-cultivated soils did not show the expected spherical forms; they also presented a high roughness although it varied across the different aggregate sizes. Soil aggregate stability, morphology and roughness were suitable

  4. Mineral trióxido agregado en pulpotomías de dientes primarios: Revisión de la literatura Mineral trioxide aggregate in primary teeth pulpotomy: Literature review

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    M. Simancas Pallares

    2011-04-01

    Full Text Available Introducción: la odontología basada en la evidencia supone una evaluación, crítica, de la evidencia disponible para mejorar la toma de decisiones en relación con el cuidado individual de los pacientes y/o comunidades. Objetivo: analizar la literatura científica disponible sobre los resultados clínicos y radiográficos de cuatro materiales empleados en pulpotomías en la dentición temporal: formocresol, sulfato férrico, hidróxido de calcio, mineral trióxido agregado. Materiales y métodos: se identificaron las publicaciones más relevantes a través de una búsqueda en bases de datos electrónicas como MEDLINE (Ovid y "The Cochrane Library". Para ser incluidos en la revisión, los estudios debieron definir el material utilizado, en pacientes niños con exposición pulpar por caries o trauma dentoalveolar. Resultados: de los 21 artículos obtenidos en la fase inicial de la revisión, sólo 19 estaban disponibles en texto completo y de éstos sólo cumplieron los requisitos de inclusión 6 artículos, los cuales fueron confrontados, analizados y discutidos posteriormente. Conclusiones: la evidencia disponible demuestra que no existen diferencias clínicas en cuanto a la utilización de un material u otro, sin embargo se deben tener en cuenta otras variables como factores económicos y edad del paciente para la correcta terapéutica.Introduction: evidence-based dentistry is a critical evaluation, raise awareness of the available evidence to improve decision making about the care of individual patients and / or communities. Objective: to analyze the available scientific literature on clinical and radiographic outcomes of two materials used in pulpotomy in primary teeth: formocresol and mineral trioxide aggregate. Materials and methods: it was identified relevant publications through a search of electronic databases such as MEDLINE (Ovid and The Cochrane Library. To be included in the review, studies had to define the material used in child

  5. Planejamento agregado da produção ótimo com limite mínimo de estoque influenciado pelas incertezas de demanda Optimal aggregate production planning with minimum inventory limit affected by demand uncertainties

    Directory of Open Access Journals (Sweden)

    Oscar S. Silva Filho

    1995-04-01

    Full Text Available O artigo trata da determinação de uma política ótima de decisão para um problema de planejamento da produção com restrições de estoque e produção. O horizonte de planejamento é finito, aproximadamente de 1 a 2 anos, com período de discretização mensal. Os dados do problema estão totalmente agregados e a flutuação de demanda ao longo dos períodos do horizonte é aleatória, com distribuição de probabilidade assumida como gaussiana. Assim, o problema estudado é de planejamento estocástico com restrição probabilística na variável de estoque. Mostra-se que é possível, a partir de transformações apropriadas, obter uma formulação determinística equivalente, para a qual uma solução do tipo malha-aberta (que é uma solução aproximada para o problema original pode ser gerada. É também mostrado que as incertezas relacionadas com flutuações futuras de demanda são explicitadas na formulação determinística por meio de uma função restrição para o limite mínimo do nível de estoque. Esta função é essencialmente côncava e crescente e depende da variância da variável de estoque e de uma medida de probabilidade, fixada a priori pelo usuário. Para ilustrar os desenvolvimentos teóricos, um exemplo simples de um sistema de produção do tipo monoproduto é proposto e resolvido por meio de programação dinâmica determinística. Então, a solução malha-aberta (i.e. solução aproximada gerada pelo problema equivalente é comparada com a solução verdadeira do problema estocástico, obtida via algoritmo de programação estocástica.This paper deals with the determination of an optimal decision policy for a production planning problem with inventory and production constraints. The planning time horizon is finite, from 1 to 2 years approximately at monthly periods, which means that all data involved with the problem are totally aggregated and the fluctuating demand for each one period is stochastic, with

  6. E-stability in the Stochastic Ramsey Model

    OpenAIRE

    Evans, George W.; Kaushik Mitra

    2012-01-01

    Analytical expectational stability results are obtained for both Euler-equation and infinitehorizon adaptive learning in a simple stochastic growth model. The rational expectations equilibrium is stable under both types of learning, though there are differences in the learning dynamics.

  7. 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 ...

  8. Transient and steady state analysis in the frequency domain for time-invariant and time variant electrical networks using the algebraic operational matrices approach; Analisis transitorio y de estado estable en el dominio de la frecuencia de redes electricas invariantes y variantes en el tiempo utilizando el enfoque algebraico de las matrices operacionales

    Energy Technology Data Exchange (ETDEWEB)

    Lazaro Castillo, Isidro Ignacio

    1999-02-01

    insight in to the properties of time varying networks by using methods of analysis in the frequency domain, which are well established for the analysis of time-invariant networks. The question arises whether these methods can be applied and modified for the analysis of time varying networks. Some possible solutions have been reported in the open literature. In this thesis a efficient solution is reported, which is based on operational matrices and, according to the author's knowledge, it has not been published before. An advantage of the method is that it can be seen as a direct extension of the Ohm's laws and the nodal analysis widely used in power systems for circuit analysis. The results presented in the thesis are validated with time domain simulations. In all cases the results obtained from both solutions matched with a vary low tolerance. [Spanish] En este trabajo el problema de predecir la distorsion armonica es tratado en forma general. El problema es presentado tal que el proceso de solucion no se limita a mantenerlo en el dominio de Fourier porque puede ser manejado en cualquier otro dominio generado por cualquier base dada por toda expansion en series ortogonales, incluidas las series de Fourier. En este trabajo se muestra que las series ortogonales tales como las series Hartley o Walsh pueden ser utilizadas para resolver mas eficientemente los problemas de distorsion armonica que la forma convencional considera en el dominio armonico. De este trabajo es claro que el dominio armonico es un caso particular de la formulacion aqui presentada. La teoria utilizada para presentar y resolver el problema de la distorsion armonica esta basada principalmente en el concepto de las matrices operacionales desarrolladas en las areas de Control y Sistemas. La aproximacion tiene la ventaja de proporcionar un marco de referencia general para resolver problemas de estado estable y dinamico en redes electricas y sistemas en general. Un hecho importante presentado en

  9. El Salto Social: la economía al servicio del hombre

    Directory of Open Access Journals (Sweden)

    Lorente Luis

    1995-06-01

    Full Text Available El aspecto más importante del nuevo plan es que coloca al ser humano y a su bienestar como objetivos directos de la política económica. Llevamos cuatro años de preocupación con objetivos abstractos: eficiencia, mercados, inflación, acumulación de capital, etcétera. Durante ese tiempo, la política social se limitó a evitar el deterioro de la situación social en las ciudades, pero se olvidó del habitante rural, en especial del campesino. Ahora el plan se preocupa por los sectores y los grupos marginados, pero con un sentido redistributivo y un objetivo de equidad: no setrata ya de subsidiar la pobreza, sino de abrir caminos de progreso a los menos favorecidos. A fin de cuentas, el camino del desarrollo es el camino del empleo, de la creación de nuevas fuentes de ingreso estable, de las oportunidadesde progreso personal. No hay desarrollo en una estrategia de subsidios a núcleos de pobres sin esperanza; en cambio, es posible crecer con objetivos de redistribución y generando una mayor equidad en materia de oportunidades.

  10. Evaluación y selección de un protocolo vía Agrobacterium para la incorporación de resistencia al cogollero en la variedad de tomate Unapal-Arreboles

    Directory of Open Access Journals (Sweden)

    Hernando Ramírez

    2009-04-01

    Full Text Available Se evaluó y seleccionó una metodología para la transformación genética de la variedad de tomate UNAPAL-Arreboles con el gen cry1Ab para la incorporación de resistencia al cogollero (Tuta absoluta, utilizando el sistema de Agrobacterium. Se regeneraron 59 plantas transgénicas a partir de 3.200 explantes (1.84%. La integración estable, expresión y herencia de los genes nptII y gus-intrón, se demostraron mediante análisis histoquímico y molecular en los clones To28, To33 y To47 y en la correspondiente generación T1. Sin embargo, los análisis molecular e inmunológico indicaron ausencia del gen cry1Ab sugiriendo que la secuencia de este gen se puede haber modificado.

  11. Estabilidade de agregados de um latossolo amarelo distrocoeso de tabuleiro costeiro sob diferentes aportes de resíduos orgânicos da cana-de-açúcar Aggregate stability in a dystrophic cohesive yellow latosol of a costal plain under different sugarcane residue application

    Directory of Open Access Journals (Sweden)

    Romero Falcão Bezerra de Vasconcelos

    2010-04-01

    Full Text Available O potencial produtivo da cana-de-açúcar decorre de fatores relacionados ao clima, ao solo e à variedade cultivada. Sistemas de manejo que proporcionem a adição de resíduos orgânicos ao solo podem provocar alterações em seus atributos físicos, favorecendo o crescimento do sistema radicular e a produtividade da canade-açúcar. O objetivo deste trabalho foi avaliar os efeitos de diferentes sistemas de manejo com cana-de-açúcar com diversos níveis de adição de resíduos orgânicos sobre a distribuição e os índices de estabilidade de agregados de um Latossolo Amarelo distrocoeso dos tabuleiros costeiros de Alagoas. Foram selecionadas áreas em talhões de produção com a cultura da cana-de-açúcar: uma área cultivada sob sistema de manejo irrigado (SMI, uma área sob sistema de manejo de fertirrigação com vinhaça (SMV e uma área sob sistema de manejo com aplicação de vinhaça + torta de filtro (SMVT. Esses sistemas de manejo foram comparados entre si e em relação a uma testemunha-padrão, representada por um fragmento de Mata Atlântica (MN. Para avaliar a distribuição e os índices de estabilidade de agregados, amostras do solo foram coletadas ao acaso, nas áreas submetidas aos diferentes sistemas de manejo, nas profundidades de 0-0,20, 0,20-0,40 e 0,40-0,60 m, sendo retiradas num ponto situado nas entrelinhas da cana-de-açúcar. Os resultados foram submetidos à análise de variância e as médias comparadas pelo teste de Tukey a 5 %. Estudos de correlações simples foram realizados entre algumas variáveis medidas. Os resultados permitiram concluir que os diferentes sistemas de manejo promoveram alterações na distribuição de agregados do solo e a estabilização dos agregados na camada superficial dependeu do teor de matéria orgânica e da ação dos ciclos sucessivos de umedecimento e secagem do solo. Os estudos de correlações entre o carbono orgânico total e os índices de estabilidade dos agregados

  12. Aggregate stability as affected by short and long-term tillage systems and nutrient sources of a hapludox in southern Brazil Efeitos de curto e de longo prazo da aplicação de sistemas de manejo do solo e de fontes de nutrientes sobre a estabilidade de agregados, em um nitossolo vermelho

    Directory of Open Access Journals (Sweden)

    Milton da Veiga

    2009-08-01

    sources on GMD AD and GMD WS was small and did not affect SI.A capacidade do solo em manter sua estrutura diante da ação de agentes erosivos como a água é geralmente alta em condições naturais e reduz quando o solo é sujeito a um preparo frequente e intensivo. O efeito de curto e de longo prazo de cinco sistemas de preparo do solo (PD = plantio direto; PE = escarificação e gradagem; PC = aração e duas gradagens; PCq = PC com resíduos queimados; e PCr = PC com resíduos retirados associados com cinco fontes de nutrientes (T = testemunha; AM = adubação mineral de acordo com a recomendação para manutenção de cada cultura; EA = 5 Mg ha-1 ano-1 de cama de aviário, base úmida; EB = 60 m³ ha-1 ano-1 de esterco líquido de bovinos; e 40 m³ ha-1 ano-1 de esterco líquido de suínos sobre a estabilidade dos agregados foi determinado ao final do nono ano de experimentação (coleta em quatro camadas e em cinco épocas de amostragens efetuadas durante o décimo ano (coleta em duas camadas, em um Nitossolo Vermelho com alto teor de argila, no Sul do Brasil. A distribuição de tamanho de agregados secos ao ar foi fortemente alterada pela densidade do solo, e os maiores valores de diâmetro médio geométrico (DMG SA encontrado em alguns sistemas de preparo ou camadas podem ser parcialmente devidos ao maior estado de compactação do solo. Depois de nove anos, o PD e o PE apresentaram maior DMG SA na camada superficial, em comparação com os sistemas de preparo convencional (PC, PCq e PCr, devido ao maior conteúdo de matéria orgânica, bem como à menor mobilização do solo. A estabilidade dos agregados em água, por outro lado, foi influenciada pela pequena variação na umidade das amostras por ocasião da realização do teste, resultando em alto coeficiente de variação dessa determinação. O PD apresentou maior diâmetro médio geométrico dos agregados estáveis em água (DMG EA na camada de 0,00-0,05 m; o PC, nas camadas de 0,05-0,10 e 0,12-0,17 m; e

  13. Hydrogen-induced changes in the crystalline structure and mechanical properties of a Zn-Al eutectoid alloy rapidly solidified

    Energy Technology Data Exchange (ETDEWEB)

    Sandoval Jimenez, Alberto; Iturbe Garcia, Jose Luis [Instituto Nacional de Investigaciones Nucleares, Ocoyoacac, Estado de Mexico (Mexico)]. E-mail: alberto.sandoval@inin.gob.mx; asandovalj@correo.unam.mx; Negrete Sanchez, Jesus [Universidad Autonoma de San Luis Potosi, San Luis Potosi (Mexico); Torres Villasenor, Gabriel [Instituto de Investigaciones en Materiales, UNAM, Mexico D.F. (Mexico)

    2009-09-15

    Ribbon fractions of a zinc-aluminum eutectoid (Zn40.8Al%at.) alloy, obtained by rapid solidification using melt spinning technique, were submitted to a thermo-hydrogenation process by periods of 1, 6, 18, 24, 30, and 48 hours, to 200 degrees Celsius and 20 atmospheres. Thermo-hydrogenated samples were analyzed by transmission electron microscopy (TEM). Hydrogen-induced changes were produced, such as microstructure refining, development of crystalline defects, microhardness changes and modification of stable crystalline structures to {alpha}R meta-stable phase at room temperature. [Spanish] Fracciones de tiras de una aleacion eutectoide de zinc-aluminio (Zn40.8Al%at.), obtenidas mediante solidificacion rapida usando la tecnica de melt spinning, se sometieron a un proceso de termohidrogenacion por periodos de 1, 6, 18, 24, 30 y 48 horas, a 200 grados centigrados y 20 atmosferas. Las muestras termohidrogenadas se analizaron por microscopia electronica de transmision (MET). Se produjeron cambios inducidos por hidrogeno, tales como la refinacion de la microestructura, el desarrollo de defectos cristalinos, cambios de microdureza y modificacion de las estructuras cristalinas estables a fase metaestable {alpha}R a temperatura ambiente.

  14. 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...

  15. 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 ...

  16. 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 ...

  17. Avaliação prognóstica da doença coronária estável através de um novo escore Evaluación pronóstica de la enfermedad coronaria estable a través de un nuevo score New prognostic score for stable coronary disease evaluation

    Directory of Open Access Journals (Sweden)

    Fernanda Coutinho Storti

    2011-05-01

    Full Text Available FUNDAMENTO: A necessidade de melhorar a acurácia do teste de esforço, determinou o desenvolvimento de escores, cuja aplicabilidade já foi amplamente reconhecida. OBJETIVO: Avaliação prognóstica do coronariopata estável através de um novo escore simplificado. MÉTODOS: Um novo escore foi aplicado em 372 coronariopatas multiarteriais e função ventricular preservada, 71,8% homens, idade média 59,5 (± 9,07 anos, randomizados para angioplastia, revascularização cirúrgica e tratamento clínico, acompanhados por 5 anos. Óbito cardiovascular foi o desfecho primário. Infarto do miocárdio não-fatal, óbito e re-intervenção formaram o desfecho combinado secundário. O escore baseou-se numa equação previamente validada resultante da soma de 1 ponto para: sexo masculino, história de infarto, angina, diabete, uso de insulina e ainda 1 ponto para cada década de vida a partir dos 40 anos. Teste positivo adicionou 1 ponto. RESULTADOS: Ocorreram 36 óbitos (10 no grupo angioplastia, 15 no grupo revascularização e 11 no grupo clínico, p = 0,61. Observou-se 93 eventos combinados: 37 no grupo angioplastia, 23 no grupo revascularização e 33 no grupo clínico (p = 0,058. 247 pacientes apresentaram escore clínico > 5 pontos e 216 > 6 pontos. O valor de corte > 5 ou > 6 pontos identificou maior risco, com p = 0,015 e p = 0,012, respectivamente. A curva de sobrevida mostrou uma incidência de óbito após a randomização diferente naqueles com escore > 6 pontos (p = 0,07, e uma incidência de eventos combinados diferente entre pacientes com escore 6 pontos (p = 0,02. CONCLUSÃO: O novo escore demonstrou consistência na avaliação prognóstica do coronariopata estável multiarterial.FUNDAMENTO: La necesidad de mejorar la exactitud de las pruebas de estrés, determinó el desarrollo de los puntajes, cuya aplicación fue ampliamente reconocida. OBJETIVO: La evaluación pronóstica del coronariópata estable a través de un nuevo score

  18. Composição química de agregados mistos de resíduos de construção e demolição do Estado de São Paulo Chemical composition of mixed construction and demolition recycled aggregates from the State of São Paulo

    Directory of Open Access Journals (Sweden)

    Carina Ulsen

    2010-06-01

    Full Text Available Os Resíduos de Construção e Demolição (RCDs representam cerca de 50% dos resíduos sólidos de cidades brasileiras; a reciclagem é, portanto, desejável, tanto do ponto de vista econômico, como ambiental. Nesse trabalho são apresentados resultados de estudos de caracterização química referentes a amostras de duas usinas de reciclagem do Estado de São Paulo. Verificou-se que a classificação corrente do RCD, segundo critérios visuais (tipos cinza e vermelho, não está relacionada à composição química destes, sendo esta influenciada, principalmente, pela granulometria. A composição química dos RCDs varia em função dos conteúdos de pasta de cimento, tipos dos agregados naturais (areia quartzosa ou granito, cerâmica vermelha e argila. Ainda, para a reciclagem dos resíduos como agregados para concretos, são necessários dois estágios de britagem para atendimento às normas ABNT. A fração miúda apresenta um enriquecimento nos teores de sílica, indicando liberação da pasta de cimento para os finos (Construction and Demolition Waste (CDW represents about 50% of the total Brazilian municipal solid waste; thus, recycling represents huge benefits both in environmental and economic perspectives. Herein, the chemical characterization results of three samples from two different recycling plants from the State of Sao Paulo is prevented. The results demonstrated that the visual classification into grey and red is not related to the chemical composition but mostly to the grain size fraction. The chemical composition of the CDW varies according to the content of cement paste, natural aggregates (quartz sand or granite, red ceramic and clay. Furthermore, the production of recycled concrete aggregates requires two crushing stages to meet the technical standards. The sand fraction (below 4.8 mm presents high grades of SiO2, which indicates the liberation of cement paste to fines (< 0.15 mm. The fines have a great potential to be

  19. Um modelo de otimização para o planejamento agregado da produção em usinas de açúcar e álcool An optimization model for the aggregate production planning in alcohol and sugar mills

    Directory of Open Access Journals (Sweden)

    Rafael Piatti Oititica de Paiva

    2007-04-01

    Full Text Available Neste trabalho apresentamos um modelo de otimização para o planejamento agregado da produção de usinas de açúcar e álcool. Este modelo se baseia nos modelos clássicos de seleção de processos e dimensionamento de lotes para representar o sistema de produção de açúcar, álcool e melaço, incluindo decisões da etapa agrícola, das fases de corte, carregamento e transporte de cana e, principalmente, decisões de moagem, escolha do processo produtivo e estoque dos produtos finais. As decisões são tomadas em períodos semanais e o horizonte de planejamento são as semanas de safra. Para resolver o modelo de programação linear inteira mista resultante, utilizamos a linguagem de modelagem GAMS e o solver CPLEX. Um estudo de caso foi realizado em uma usina de açúcar e álcool do estado de Alagoas. Neste estudo foi possível verificar a adequação do modelo proposto quando aplicado para auxiliar nas decisões envolvidas no planejamento agregado da produção de empresas deste tipo. Resultados computacionais são apresentados resolvendo um exemplo com dados de uma safra típica.The main concern of this work is related to the presentation of an aggregate production planning model of a sugar and alcohol milling company. The mathematical model is based on the process selection model and the production lot-sizing model, and aims to help the decision makers in the production planning and control process of determining the quantity of sugarcane crushed, the selection of sugarcane suppliers, the selection of sugarcane transport system suppliers, the selection of industrial process used in the sugar, alcohol and molasses production and the storage decisions related to these final products. The decisions are taken on a weekly basis and the planning horizon is the whole sugarcane harvesting season. To solve the mixed integer mathematical problem found in this model, we applied the GAMS modeling language and the CPLEX solver. A case study was

  20. Cobertura de los sistemas de pensiones y factores asociados al acceso a una pensión de jubilación en México

    Science.gov (United States)

    Murillo-López, Sandra; Venegas-Martínez, Francisco

    2016-01-01

    Resumen Objetivos: obtener estimaciones de indicadores de cobertura de las pensiones por jubilación o retiro para la población mexicana de 65 y más años, y evaluar el impacto que tienen los sistemas de pensiones en las transiciones al retiro de los adultos en edades medias y avanzadas en México. Para ello se utilizan datos microeconómicos provenientes de la Encuesta Nacional de Salud y Envejecimiento. Mediante análisis econométrico se identifican los factores sociodemográficos, económicos, laborales e institucionales que están asociados al acceso a una pensión de jubilación, o bien, a la dependencia de otras fuentes de ingresos. Se encontró que, en México, las transiciones al retiro del mercado de trabajo en las etapas avanzadas del ciclo de vida son limitadas debido a las características eminentemente contributivas de los esquemas de pensiones, los cuales favorecen a la población con trayectorias laborales formales y más estables asociadas a: características de género, oportunidades educativas y posibilidades de inserción en el mercado laboral. PMID:27524936

  1. SELECCIÓN DE NUEVOS GENOTIPOS DE ARROZ BASADOS EN LA PROBABILIDAD DE SUPERAR AL TESTIGO

    Directory of Open Access Journals (Sweden)

    Ismael Camargo-Buitrago

    2014-01-01

    Full Text Available El objetivo de este trabajo fue validar una metodología estadística para estimar la confiabilidad o respuesta normalizada (RN i y la esta - bilidad de cuatro genotipos elite de arroz, en comparación con el testigo IDIAP 145-05. Se utilizó la base de datos del proyecto de mejoramiento genético de arroz del IDIAP, proveniente de los experimentos realizados entre el 2009 y 2011, en 31 ambientes bajo condiciones de secano. Los resultados del estudio permitieron verificar que los nuevos genotipos superaron significativamente (P<0,05 en rendi - miento al testigo. Los cuatro genotipos IDIAP FL 106-11, IDIAP FL 137-11, IDIAP FL 155, e IDIAP FL 156 presen - taron una confiablidad promedio de 0,79; 0,75; 0,75 y 0,74, respectivamente. La probabilidad normalizada del IDIAP FL 106-11 representó una respuesta diferencial en rendimiento mayor que cero con respecto al IDIAP 145-05, en ocho de cada diez casos. La confiabilidad estuvo relacionada con los parámetros de estabilidad basados en modelos de regresión (b i y S 2 di . El modelo multivariado AMMI, considerando el PCA1, identificó el genotipo IDIAP FL 156, como el más estable. El modelo Biplot GGE, basado en el PCA2, indicó que el genotipo IDIAP FL 155, tuvo mayor estabilidad. La confiabilidad o respuesta normalizada, puede ser útil para hacer recomendaciones más precisas para la utilización de los nuevos genotipos a nivel comercial

  2. 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.

  3. 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.

  4. 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.

  5. 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...

  6. 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.

  7. Valor económico agregado en la extracción de los recursos minerales metálicos en Colombia y su relación con el desarrollo sostenible

    OpenAIRE

    Oviedo Peñata, Pedro David

    2015-01-01

    Resumen: El presente trabajo busca generar una aproximación sobre la viabilidad de incluir dentro de los procesos de extracción de minerales el concepto de Desarrollo Sostenible, de tal forma que se logre establecer la relación que existe entre la minería y los principios de sostenibilidad. Así mismo, revisar el impacto de esta relación en el crecimiento económico del país y la rentabilidad económica y financiera acorde al riesgo y a la inversión. La minería siempre ha jugado un papel fun...

  8. Efecto de la estequiometría y de la temperatura de cocción en el desarrollo de la fase Al2TiO5

    Directory of Open Access Journals (Sweden)

    Baptista, J.

    2003-04-01

    Full Text Available Aluminum Titanate (Al2TiO5 due to its low termal expansion coefficient, low wettability and high refractoriness is a promissing refractory ceramic to be in contact with non ferrous metals, specially molten aluminum. Controlled amounts of CaO, SiO2, MgO and ZrO2 are normally added in order to avoid expontaneous decomposition, lower than 1300°C, into its constituint oxides. In this work through the adoption of a new approach, it was investigated the Al2TiO5 phase development and stabilization with respect to stoichiometry and firing temperature. It was found that an excess of Titania (TiO2 helps the development of a stable and purer Aluminum Titanate phase.El Titanato de Aluminio (Al2TiO5 debido a su bajo coeficiente de expansión térmica, elevada refractariedad y baja mojabilidad por metales no ferrosos fundidos, es un material prometedor en la industria del Aluminio para aplicaciones donde se exige contacto con el baño metálico. Aditivos como CaO, SiO2, MgO y ZrO2 son necesarios para evitar la descomposición espontánea del Al2TiO5 en sus óxidos constituyentes a temperaturas inferiores a 1300°C. En este trabajo, se ha investigado el efecto de la estequiometría y de la temperatura de sinterización en el desarrollo y estabilidad de la fase Al2TiO5. Se ha encontrado que un exceso de Óxido de Titanio (TiO2 es beneficioso en la producción de Al2TiO5 puro y estable.

  9. 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? ...

  10. 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.

  11. [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

  12. El acuerdo de comercio preferencial entre la Unión Europea, Colombia y Perú. Contenido y cambios al Status quo

    Directory of Open Access Journals (Sweden)

    Dieter Wolfram

    2011-12-01

    Full Text Available El acuerdo de comercio preferencial negociado y suscrito entre la Unión Europea, Colombia y Perú en mayo de 2010 aspira a profundizar y vivificar las relaciones comerciales entre las partes sin causar conflictos con convenciones internacionales multilaterales como el GATT, el GATS, el ADPIC, y la Convención sobre la Biodiversidad. . Un análisis de los cambios jurídicos impulsados por el acuerdo muestra pocas modificaciones o cambios sustanciales del status quo. Para los comerciantes andinos, el Acuerdo brinda pocas oportunidades comerciales nuevas, sino que pone las preferencias comerciales existentes sobre una base más estable. En cuanto al acceso de productos europeos a los mercados de Colombia y Perú, los aranceles se reducirán de forma bastante gradual, protegiendo a varios sectores considerados “sensibles”. Aunque el Acuerdo mejore las condiciones para el intercambio de servicios y la participación en licitaciones públicas, puede ser difícil superar preferencias tradicionales a favor de prestadores domésticos. El Acuerdo contempla una intensiva cooperación administrativa con el fin de reducir barreras al comercio e instigar a los operadores económicos a aprovechar las opciones comerciales que se les ofrecen. El potencial de aprendizaje que ello implica quizá la ventaja más relevante del Acuerdo.

  13. Tecnoparque SENA : Una apuesta biotecnológica al alcance de todos

    Directory of Open Access Journals (Sweden)

    María Isabel Gaviria

    2013-06-01

    Full Text Available A nivel mundial se considera que la biotecnología y la nanotecnología son ejes centrales para la  solución  de  grandes problemas de la humanidad como el cambio climático, la cura de enfermedades, la generación de energías alternativas y la emergencia alimentaria[1]. En el mercado nacional, la biotecnología se plantea como sector estratégico dentro de las locomotoras de innovación y estrategia transversal para dar valor agregado a sectores de talla mundial[2]. En este contexto, el programa de innovación SENA denominado “Red Tecnoparque” ofrece al país asesoría técnica especializada y acceso gratuito a infraestructura de punta en 4 áreas del conocimiento incluyendo la línea de biotecnología y nanotecnología. Particularmente, en Tecnoparque nodo Medellín esta línea  viene impulsando desde el año 2010 el desarrollo de proyectos productivos basados en conocimiento, trabajando de la mano de las más importantes y reconocidas instituciones acádemicas en áreas estratégicas como nanotecnología aplicada a nuevos materiales y formulación de alimentos funcionales basados en probióticos. [1]  CITATION Shu12 \\l 9226 (Shumpeter, 2012   [2]  CITATION The09 \\l 9226 (The Bioeconomy to 2030 - Designing a policy agenda, 2009

  14. 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.

  15. 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 ...

  16. 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.

  17. 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 ...

  18. 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...

  19. 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...

  20. Elaboración de Panes con Agregado de Harina de Arroz Integral y Modelación de sus Atributos Sensoriales a Través de la Metodología de Superficie de Respuesta Elaboration Bread with Added Rice Flour and Modeling of Sensory Attributes Through Response Surface Methodology

    Directory of Open Access Journals (Sweden)

    Armando Alvis

    2011-01-01

    Full Text Available Se estudió la elaboración de pan con agregado de harina de arroz integral a través de 17 formulas experimentales. Esto con el objetivo de encontrar una formulación para la producción de pan que presente mejores propiedades físicas y sensoriales y mejor calidad nutricional. La panificación se llevó a cabo con la hidratación necesaria para mantener la mezcla batida a consistencia constante. Los panes fueron evaluados por sus atributos sensoriales a través de un panel entrenado y el análisis se realizó mediante gráficos de superficies de respuesta para cada una de las variables evaluadas. Se obtuvo correlaciones lineales altamente significativas entre la dureza, elasticidad y volumen específico medidos instrumentalmente y lo determinado por los jueces. Se concluye que los modelos matemáticos desarrollados pueden sustituir la evaluación sensorial de las propiedades físicas evaluadas y determinar la mejor formulación para la producción de pan.The production of bread with added rice flour through 17 experimental formulas. This with the aim of finding a formulation for the production of bread that presents better physical and sensory properties and improved nutritional quality. Baking was carried out with the necessary moisture to keep the mix with constant consistency. The sensory attributes of the bread were evaluated by a trained panel and the analysis was performed using response surface graphs for each of the variables evaluated. Highly significant linear correlations were obtained between experimental hardness, elasticity and specific volume and hardness and the characteristics determined by the judges. It is concluded that the mathematical models developed in this work can replace the sensory evaluation of the studied properties and determine the best formulation for the production of bread.

  1. Um modelo de otimização linear para o planejamento agregado da produção e logística de sementes de milho A linear optimization model to the aggregate production and logistics planning of corn seeds

    Directory of Open Access Journals (Sweden)

    Rogério de Ávila Ribeiro Junqueira

    2006-12-01

    Full Text Available A produção de sementes de milho envolve uma cadeia de produção agroindustrial complexa cujos agentes devem primar por oferecer produtos de alta qualidade a um baixo custo para se manterem competitivos no mercado. Neste trabalho, um modelo de otimização linear é proposto para auxiliar nas decisões do planejamento tático da produção, estocagem e transporte de sementes de milho, de forma a minimizar custos de produção, logísticos e fiscais, atendendo às restrições de programação da colheita, capacidade das plantas e demanda dos clientes. Para verificar a coerência do modelo e validar a abordagem, o modelo foi implementado na linguagem de modelagem GAMS e aplicado para resolver diferentes cenários de um exemplo baseado em dados realistas de uma empresa. Os resultados mostraram a importância de se considerar os custos fiscais de ICMS no planejamento agregado da produção e logística de sementes de milho.The production of corn seeds involves a complex agro-industrial production chain whose main agents must offer products of high quality and low price to stay competitive in the market. This work proposes a linear optimization model to support decisions in the tactical planning of production, storing and transportation of corn seeds, designed to minimize production, logistics and tax costs and to satisfy crop planning, plant capacity and client demand constraints. In order to verify the consistency of the model and validate the approach, the model was implemented in the GAMS modeling language and applied to solve different scenarios of an example based on realistic data of a company. The results showed the importance of considering tax costs in the production and logistics aggregate planning of corn seeds.

  2. Microscopic analysis of dog dental pulp after pulpotomy and pulp protection with mineral trioxide aggregate and white Portland cement Análise microscópica da polpa dental de cães após pulpotomia e proteção pulpar com agregado de trióxido mineral e cimento Portland branco

    Directory of Open Access Journals (Sweden)

    Renato Menezes

    2004-06-01

    Full Text Available Considering previous studies on the similarity between the chemical composition of the mineral trioxide aggregate and the Portland cement, the purpose of this study was to investigate the pulp response of dog's teeth after pulpotomy and direct pulp protection with MTA Angelus and white Portland cement. Thirty eight pulp remnants were protected with these materials. One hundred and twenty days after treatment, the animals were sacrificed and the specimens removed and prepared for histological analysis. Both materials demonstrated the same results when used as pulp capping materials, inducing hard tissue bridge formation and maintaining pulp vitality in all specimens. The MTA Angelus and the white Portland cement showed to be effective as pulp protection materials following pulpotomy.Considerando estudos anteriores sobre a similaridade entre a composição química do agregado de trióxido mineral e o cimento Portland, o objetivo deste estudo foi investigar a resposta pulpar de dentes de cães após pulpotomia e proteção pulpar direta com MTA Angelus e cimento Portland branco. Trinta e oito remanescentes pulpares foram recobertos com esses materiais. Cento e vinte dias após o tratamento, os animais foram sacrificados e os espécimes removidos e preparados para análise histológica. Ambos os materiais demonstraram os mesmos resultados quando utilizados como materiais de capeamento pulpar, induzindo a formação de ponte de tecido mineralizado e mantendo a vitalidade pulpar em todos os espécimes. Ambos matérias se mostraram efetivos como protetores pulpares após pulpotomia em dentes de cães.

  3. Thermodinamically stable phases in the CaO-SiO2-Al2O3-CaSO4-H2O closed system at 25 ºC. Application to cementitious systems

    Directory of Open Access Journals (Sweden)

    Blanco-Varela, M. T.

    2009-06-01

    Full Text Available One of the chief causes of cement and concrete deterioration is the loss of durability prompted by sulphate attack. The existing standards call for long test periods (2- 12 months. Thermodynamic modelling is a particularly appropriate technique for studying systems that only reach equilibrium in the long term. Used in the present study to establish the fields of thermodynamic stability for the phases in the CaO-SiO2-Al2O3-CaSO4-H2O system at 25 ºC. According to the model, gypsum is stable at sulphate ion concentrations of 1.23e-2 mol/kg and over, while ettringite exhibits stability at concentrations ranging from 7.64e-6 to 1.54e-2 mol/kg. Ettringite is compatible with all system phases except SH and gypsum only with ettringite, the C-S-H gels, AH3 and SH. None of the calcium aluminates or silicoaluminates in the system is compatible with gypsum: in its presence, they all decompose to cement deteriorating ettringite. Finally, the model revealed that the maximum sulphate concentration at which C-S-H gel is stable is slightly higher in systems with than without Al2O3.Uno de los principales problemas asociados al deterioro de cementos y hormigones es la pérdida de durabilidad por ataque de sulfatos. La normativa existente requiere largos tiempos de ensayo (2-12 meses. La modelización termodinámica es una técnica particularmente adecuada para el estudio de sistemas que alcanzan el equilibrio en tiempos largos. Aplicando esta metodología se han establecido los campos de estabilidad termodinámica de las fases del sistema CaO-SiO2-Al2O3-CaSO4-H2O a 25 ºC. El yeso es estable a partir de la [SO42-] = 1,23e-2 mol/kg, y la ettringita es estable en un rango de [SO42-] = 7,64e-6 -1,54e-2 mol/kg. La ettringita es compatible con todas las fases del sistema excepto con SH y el yeso sólo con la ettringita, los geles C-S-H, el AH3 y el SH. Ninguno de los aluminatos o silicoaluminatos cálcicos son compatibles con el yeso, en su presencia se descomponen

  4. Preparo do solo em áreas de produção de grãos, silagem e pastejo: efeito na resistência tênsil e friabilidade de agregados Soil tillage in grain and silage-producing areas and pasture: effect on tensile strength and aggregate friability

    Directory of Open Access Journals (Sweden)

    Marina Araújo Bavoso

    2010-02-01

    Full Text Available A compreensão e a quantificação do impacto do uso e manejo na qualidade do solo são fundamentais no desenvolvimento e seleção de sistemas de produção agrícola sustentáveis. O objetivo do presente estudo foi avaliar a qualidade estrutural de um Latossolo Bruno argiloso submetido a diferentes sistemas de produção e preparo do solo por meio da resistência tênsil (RT e friabilidade (F de agregados. O estudo foi realizado no município de Castro, Estado do Paraná, em três sistemas de produção e sete tipos de preparo de solo, estabelecidos em um delineamento fatorial em blocos casualizados. Os sistemas avaliados foram: (SP I - plantio de azevém para cobertura do solo (no inverno e milho para a produção de grãos (no verão; (SP II - plantio de azevém para a produção de silagem pré-secada e milho para a produção de grãos; e (SP III - utilização de azevém como forrageira para pastejo animal e milho para a produção de grãos. Em cada sistema de produção foram avaliados sete tipos de preparo do solo: (G1 - grade aradora no inverno a 0,15 m de profundidade; (G2 - grade aradora no inverno e no verão a 0,15 m de profundidade; (Arado - arado de discos a 0,20 m de profundidade; (Subsolador Asa Laser - subsolador com ponteiras tipo asa até 0,45 m; (Subsolador - subsolador até a profundidade de 0,80 m; (Aerador - aerador de solo Aeromix® com profundidade efetiva de mobilização de 0,15 m; e (SPD - Sistema Plantio Direto, em que a semeadura do azevém foi realizada com disco duplo e a do milho com haste sulcadora. Um bloco de solo (0,20 x 0,15 x 0,07 m de cada parcela experimental foi manualmente destorroado em seus agregados naturais, os quais foram secos ao ar por 24 h e passados em peneiras com diâmetros de 12,5 e 19 mm. Quarenta agregados de cada bloco foram selecionados e submetidos a testes de tensão indireta com dinamômetro digital eletrônico de precisão (Lutron FG-20 kg, para determinação de RT e quantifica

  5. Avaliação das propriedades físicas e mecânicas de concretos produzidos com vidro cominuído como agregado fino Evaluation of physical and mechanical properties of concretes produced with ground waste glass as fine aggregate

    Directory of Open Access Journals (Sweden)

    D. A. R López

    2005-12-01

    Full Text Available O presente trabalho insere-se na proposta da utilização racional dos recursos naturais não renováveis. Ele tem por objetivo, estudar a viabilidade técnica da utilização de vidro não reciclado como material agregado ao concreto, especificamente pela comparação das propriedades mecânicas de concretos fabricados com o novo componente, visando a sua utilização para fins estruturais. A comparação foi realizada por meio do estudo das propriedades mecânicas de concretos produzidos primeiramente com a substituição da areia por vidro moído e, numa segunda parte, pela adição do vidro moído sobre a massa de areia. Os resultados desta pesquisa mostraram que com a substituição de 5% em peso do agregado fino (areia por vidro numa granulometria variando entre 150-300 µm houve um aumento de ~ 60% na resistência à compressão do concreto fabricado, o que seria causado pela diminuição da porosidade do concreto por causa da penetração de vidro fino nos vazios. A utilização de outras faixas granulométricas acarretou aumentos menores, porém todos superiores aos valores apresentados pelo corpo de referência. Por outro lado, a adição de vidro moído na granulometria 150-300 µm em percentagens de até 20% sobre o peso do agregado fino (areia teve um efeito bem diferente sobre o concreto produzido. A maior resistência à compressão, 56,6% superior à do material de referência, foi obtida com a adição de 5% em peso de vidro fino sobre o peso da areia. Acima desta percentagem, houve uma diminuição da resistência à compressão do concreto. Isto estaria influenciado pelo aumento da quantidade de material seco que deveria ser hidratado, uma vez que a relação água/cimento foi constante.This work consists on the proposal of rational utilization of non-renewable natural resources. It has the objective of studying the technical viability of utilization of ground waste glass as material aggregate to concrete specifically by the

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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)

  11. 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…

  12. Influencia del agregado de enmiendas básicas sobre la producción de alfalfa (Medicago sativa L. en ámbitos templados argentinos Basic amendment application effects on alfalfa production in Argentine temperate areas

    Directory of Open Access Journals (Sweden)

    Mabel Vázquez

    2010-12-01

    Full Text Available Causas naturales y antrópicas producen la acidificación de suelos de ámbitos templados, provocando deficiencias/desbalances de nutrientes básicos, particularmente Ca y Mg. El tratamiento del problema requiere de experimentación regional, a los fines de brindar pautas para la elección del corrector, dosis y forma de aplicación. El objetivo del trabajo fue comparar el rendimiento de alfalfares de tres ámbitos de la región templada argentina, su contenido en nutrientes básicos y las modificaciones edáficas causadas por distintas dosis/tipos de enmiendas. Se realizaron dos ensayos en suelos Argiudol típico y uno en Hapludol éntico de las provincia de Buenos Aires, Santa Fe y Córdoba. Los tratamientos consistieron en la aplicación de 0, 700 ó 1.000, 1.500 y 2.000 kg ha-1 de conchilla/caliza (C y dolomita (D, según el sitio. Se evaluó el efecto de la aplicación conjunta de 200 kg ha-1 de yeso. Se determinó rendimiento en materia seca, contenido foliar de Ca y Mg y el efecto sobre propiedades edáficas. Las menores dosis (700-1.000 kg ha-1, solas o con yeso, produjeron los mayores aumentos de rendimiento. Dichos aumentos fueron de 9, 16,5 y 18,8% respecto del testigo, para los ensayos de Santa Fe (C1000; 6 cortes, Buenos Aires (C1000, 5 cortes y Córdoba (C700, 10 cortes, respectivamente, y de 11,7; 14,4 y 9,1% respecto del testigo, para los ensayos de Santa Fe (D1000, Buenos Aires (D1000 y Córdoba (D700, respectivamente. La residualidad se extendió durante todo el tiempo evaluado (27 meses. Los tratamientos no produjeron mayores diferencias en las concentraciones foliares de Ca y Mg, aunque los mismos aumentaron la oferta de ambos nutrientes por unidad de superficie a expensas del aumento de rendimiento, con máximos de 9,4 kg ha-1 de Ca y 7,6 kg ha-1 de Mg. Al cabo de dos años de encalados, los suelos aún consignaron efectos en la reducción de la acidez actual (0,1-1,1 unidades de pH, como en la acidez potencial (0

  13. 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

  14. 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.

  15. 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 ...

  16. 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 ...

  17. 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.

  18. Indicadores logísticos en la cadena de suministro como apoyo al modelo scor

    Directory of Open Access Journals (Sweden)

    Abdul Zuluaga Mazo

    2015-01-01

    Full Text Available Este artículo tiene como principal objetivo revisar, analizar y proponer el uso de indicadores en los diferentes procesos logísticos de la cadena de suministro, los cuales cubren desde el aprovisionamiento pasando por el almacenamiento, la producción, el servicio al cliente, entre otros. Como resultado del desarrollo de un trabajo de investigación llamado « Estrategias logísticas para el abastecimiento de las pymes del sector confección del municipio de Itagüí». Se concluye que los indicadores planteados permiten medir el desempeño de los diferentes procesos logísticos en la cadena de suministro, lo cual, se convierte en la base para control del uso de los recursos, seguimiento al cumplimiento de objetivos e identificación de oportunidades de mejoramiento. La metodología que se utilizó para definir los indicadores fue a través del análisis de bibliografía especializada y la creación de unos indicadores propios a partir de modelos de referencia estándar de algunas empresas. Adicionalmente, los indicadores que se presentan sirven de apoyo a la medición del modelo de cadena de suministro SCOR, lo cual, se convierte en un valor agregado para el ámbito académico y empresarial.Palabras clave: Cadena de Suministro, nivel de desempeño, indicador, logística, KPI’s (Indicadores  de desempeño.Logisticals indicators in the supply chain as support to scor model.This paper has as its main objective of reviewing, analyzing and propose the use of indicators in different logistics processes  in the supply chain, which range from the supply, warehouse, production, customer service, among others. As a result of developing the document, supported by a previous research work called « Estrategias logísticas para el abastecimiento de las pymes del sector confección del municipio de Itagüí». We obtain indicators to measure the performance of the different logistics process in the supply chain, which becomes the basis to control the

  19. Modificación de arcillas colombianas con pilares mixtos de Al-Fe y su evaluación en la oxidación catalítica de fenol en solución acuosa diluida

    Directory of Open Access Journals (Sweden)

    Luis Galeano

    2010-11-01

    Full Text Available La legislación ambiental es particularmente restrictiva respecto a la disposición de contaminantes biorrefractarios presentes en aguas residuales. Las arcillas pilarizadas tienen gran versatilidad para ajustarse a reacciones de interés ambiental, entre otras. En el presente estudio se logran modificar arcillas de origen colombiano con soluciones de pilares mixtos Al-Fe, las cuales muestran un excelente desempeño en la oxidación catalítica de soluciones acuosas con contenidos medios de carbono orgánico total COT (36 mg C/L. Con los materiales sintetizados se alcanza una conversión total de fenol, molécula contaminante modelo, en 2 horas de reacción a 20°C y presión atmosférica; en 4 horas de reacción, se alcanza la remoción de hasta el 62% de COT de la solución obteniéndose, principalmente, ácidos carboxílicos ligeros como subproductos, además de CO. Los materiales son estables al medio fuertemente oxidante de la reacción, y el Fe lixiviado en la solución se encuentra en un valor cercano a 0,2 mg/L para el material de mejor desempeño catalítico.

  20. Ganancias de competitividad: un enfoque agregado y de largo plazo

    OpenAIRE

    Germán H. González

    2009-01-01

    El artículo ofrece un modelo de ganancias de competitividad alternativo a los enfoques de corto plazo, basado en la teoría de crecimiento y enfatizando el rol de la productividad multifactorial en la determinación del perfil competitivo de una economía en el plano internacional. Se presenta además un indicador de ganancias de competitividad teóricamente fundamentado y una evaluación de la bondad de ajuste de las predicciones del modelo utilizando dos paneles de datos de países desarrollados y...

  1. 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...

  2. 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

  3. 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

  4. Control organizacional: ¿sistema o agregado de elementos? Control organizacional: ¿sistema o agregado de elementos?

    Directory of Open Access Journals (Sweden)

    María Rocío Arango Restrepo

    2007-12-01

    Full Text Available This paper deals with organizational control as a system and with the main difficulties associated with this conception. It has three parts: an analysis of the definition of organizational control, the description of the basic structures of the control system, and the explanation of the systemic, behavioral and political barriers that hamper integral understanding of organizational control.Este artículo trata sobre el control organizacional entendido como un sistema ylas principales dificultades que acarrea esta concepción. Consta de tres partes: elanálisis de la definición de control organizacional, la descripción de la estructurabásica del sistema de control y la explicación de las barreras sistémicas, conductualesy políticas que dificultan la comprensión integral del control organizacional.

  5. 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)

  6. Dinámica de impregnación al vacío en apio (Apium graveolens L. y pepino (Cucumis sativus L.

    Directory of Open Access Journals (Sweden)

    Yisell Martelo C.

    2011-05-01

    Full Text Available Objetivo. Evaluar la respuesta a la impregnación al vacio (IV en apio y pepino, con soluciones isotónicas de NaCl. Materiales y métodos. Se determinaron variables de impregnación en troncos de apio y rodajas de pepino (3 posiciones diferentes a lo largo de su estructura, considerando, fracción y deformación volumétrica en la etapa de vacío (X1 y g1 y atmosférica (X y g, y la porosidad disponible (Ee al proceso IV. Resultados. El apio y pepino no presentaron diferencias estadísticas por efecto de la posición. En las etapas de proceso se obtuvieron para el apio y el pepino valores de X1 (-14.32 ± 2.75 y -5.51±1.76%, g1 (-0.587±0.69 y -0.079±0.99%, X(13.49±2.32 y 6.72±2.72%, g (-1.40±1.042% y -2.33±1.26% y Ee (15.73±2.31 y 9.35±2.57%, respectivamente. Estos resultados indicaron una salida de líquido nativo (X1<0 y una ligera contracción volumétrica de las estructuras (g y g1<0, lo cual se evidenció microestructuralmente. Conclusiones. La respuesta a la IV en apio y pepino, permite identificar estas matrices alimentarias, como aptas para la incorporación de componentes que le proporcionen un valor agregado a estos productos.

  7. 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

  8. Inclusiones fluidas e isotopos estables en la ganga de los yacimientos de manganeso del norte de la provincia de Córdoba Fluid inclusions and stable isotopes in non-ore minerals of the manganese ore deposits in the north of the Córdoba province

    Directory of Open Access Journals (Sweden)

    P.R. Leal

    2002-09-01

    Full Text Available En este trabajo se analizan las características físico-químicas asociadas a la precipitación de la ganga de yacimientos epitermales de manganeso. Estos minerales fueron formados principalmente durante la etapa póstuma del sistema, el cual es posible dividir espacialmente en tres sectores en función del mineral más abundante. En esta oportunidad se estudia el sector austral donde el mineral más común es la calcita. El análisis microtermométrico de las inclusiones fluidas sobre muestras de calcita, baritina y fluorita, hizo posible obtener salinidades del fluido de 2,7 y 4% eq. en peso NaCl y temperaturas inferiores a 100°C. Los estudios de isótopos de 13C, 18O y 34S en calcita y baritina permitieron determinar la fuente meteórica de los fluidos asociados a su precipitación. Al mismo tiempo los valores de d13C en calcita se consideran el resultado de un fluido en equilibrio con CO2 atmosférico y cantidades menores de carbono producto de la disolución de compuestos orgánicos. Por otro lado, los valores de d34S de la baritina pueden ser explicados por un fluido con H2S que resulta de la disolución de sulfuros de las rocas de caja. Finalmente, se postula la presencia de dos fluidos. Un fluido ascendente fue el responsable de la precipitación de la baritina en la zona donde el H2S se oxida a SO4=; al mismo tiempo, éste pudo también formar fluorita y variedades de sílice conforme su temperatura desciende. La existencia de un fluido descendente permite explicar la generación de calcita por calentamiento del mismo.In this paper the non-ore minerals of the southern sector of this deposit are studied. Microthermometric analysis on calcite, barite and fluorite show fluid salinities of 2.7 and 4% wt eq. NaCl, and temperatures below 100°C. Isotopes of 13C, 18O and 34S allow to determine a meteoric source for the fluids associated to their precipitation. The d13C values obtained in calcite are considered the result of a fluid in

  9. 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...

  10. Effect of different dye solutions on the evaluation of the sealing ability of mineral trioxide aggregate Efeito de diferentes soluções corantes na avaliação da capacidade seladora do agregado de trióxido mineral

    Directory of Open Access Journals (Sweden)

    Mário Tanomaru Filho

    2005-06-01

    Full Text Available Alkaline materials have shown incompatibility with methylene blue dye in leakage experiments. The goal of the present study was to analyze the effect of different dyes on the evaluation of the apical sealing ability of Mineral Trioxide Aggregate root-end fillings. Fifty-six extracted human canines were submitted to root canal instrumentation and obturation. After apical resection, retrograde cavities were prepared and teeth were randomly divided into four experimental (n = 13 and two control groups (n = 2. The following root-end filling materials were used: groups 1 and 2 - Pro Root MTA (Dentsply, groups 3 and 4 - zinc oxide-eugenol cement (ZOE. Teeth in groups 1 and 3 were immersed in 2% methylene blue solution, while teeth in groups 2 and 4 were immersed in 0.2% rhodamine B in a reduced pressure environment for 48 hours. Teeth were then longitudinally sectioned and leakage was evaluated. Results were submitted to statistical analysis (ANOVA and Tukey's test. Group 1 presented the least leakage (p Tem sido demonstrada a incompatibilidade de materiais alcalinos com a solução corante de azul de metileno utilizada em testes de infiltração marginal. O objetivo do presente estudo foi analisar a influência de diferentes soluções corantes na avaliação do selamento apical proporcionado pelo agregado de trióxido mineral. Cinqüenta e seis caninos humanos extraídos tiveram seus canais radiculares instrumentados e obturados. Após a secção da porção apical, cavidades retrógradas foram preparadas e os dentes divididos aleatoriamente em quatro grupos experimentais (n = 13 e dois controles (n = 2. Foram utilizados os seguintes materiais retrobturadores: grupos 1 e 2 - Pro Root MTA (Dentsply; grupos 3 e 4 - cimento de óxido de zinco e eugenol (OZE. Em seguida, os dentes dos grupos 1 e 3 foram imersos em solução de Azul de Metileno a 2% e dos grupos 2 e 4 em solução de Rodamina B a 0,2% por 48 horas em ambiente com vácuo. Decorrido este

  11. Soil CO2 emission as related to incorporation of sugarcane crop residues and aggregate breaking after rotary tiller Emissão de CO2 do solo em função da incorporação de palha de cana-de-açúcar e quebra de agregados após preparo com enxada rotativa

    Directory of Open Access Journals (Sweden)

    Luis G Teixeira

    2011-12-01

    , e 3 preparo com enxada rotativa com a presença de palha superficial (ERc. As emissões provenientes da ERc foram superiores às demais (0,777 g CO2 m-2 h-1, sendo as menores emissões registradas na parcela SPs (0,414 g CO2 m-2 h-1. As emissões totais indicaram que a diferença de C-CO2 emitida à atmosfera corresponde a 3% do total de carbono adicional presente na palha, na parcela ERc, quando comparado à parcela ERs. O aumento da emissão da parcela SPs para ERs foi acompanhado de uma modificação na distribuição do tamanho de agregados, especialmente aqueles com diâmetro médio inferior a 2 mm. O aumento da emissão da parcela ERs para ERc esteve relacionado a uma diminuição da massa de palha na superfície, com fragmentação e incorporação da mesma no interior do solo. Quando se analisa a correlação linear entre emissão de CO2 versus temperatura e umidade do solo, somente a emissão da ERc foi significativamente correlacionada (p<0,05 à umidade do solo.

  12. 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.

  13. 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

  14. Beneficios de la ingesta del Phlebodium decumanum sobre el daño muscular al efectuar ejercicio físico intenso en sujetos sedentarios

    Directory of Open Access Journals (Sweden)

    M. C. Vargas Corzo

    2014-06-01

    Full Text Available Introducción: El ejercicio intenso provoca un daño muscular inflamatorio que, en sujetos sedentarios provoca un aumento del riesgo cardiovascular. El Phlebodium decumanum (PD ha evidenciado efectos inmunomoduladores protectores frente a ese daño en los deportistas. Para conocer los efectos del PD en una población sedentaria frente al ejercicio excéntrico, y como modelo del daño muscular inflamatorio. Metodología: Se llevó a cabo un estudio experimental, doble ciego, multigrupo, randomizado, con un grupo experimental (n = 17 al que se le administró una formulación de PD (3,6 g/sujeto distribuidos en 9 dosis de 400 mg desde el 3.er día pretest, y un grupo control (n = 16 que tomó sustancia placebo. Se realizaron dos ergoespirometrías en tapiz rodante a cada participante: una previa al estudio (protocolo de Bruce modificado para descartar signos de isquemia durante el esfuerzo y valorar el VO2max; la segunda, aplicando un protocolo excéntrico (14% de desnivel descendente, durante 10 minutos en estado estable a una intensidad entre 70-80% del VO2max individual, como protocolo experimental. Se efectuaron comparaciones intragrupo e intergrupo del porcentaje de cambio pre-postesfuerzo en variables sanguíneas y de funcionalidad muscular. Resultados: El estudio evidencia aumentos significativos de enzimas musculares MG, CPK y LDH en los dos grupos de estudio, sin cambios para la TncI, siendo significativamente menores en el grupo al que se le administró PD. Se observaron reducciones significativas de los test funcionales SJ, CMJ en ambos grupos, lo que mostró un apreciable menor descenso en el grupo PD. Se apreció una reducción del índice elástico y de la dinamomentría manual solo en el grupo control, aunque las diferencias con el grupo PD no alcanzaron una significación estadística. Conclusiones: El protocolo del ejercicio excéntrico en el presente estudio ha inducido daños musculoesqueléticos y en la funcionalidad muscular

  15. Estabilidad temporal de mepivacaína al 1.5% alcalinizada

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    M. Gerónimo

    2008-10-01

    Full Text Available Objetivos: Estudiar la estabilidad en el tiempo de la mepivacaína alcalinizada en cuanto a valores de pH y formación de precipitados, ya que apenas existe información en la literatura acerca de la estabilidad temporal de este anestésico, y la información disponible aconseja alcalinizarla Justo antes de su empleo. Material y métodos: Fueron preparadas tres Jeringas (A, B y C de 20 mL conteniendo mepivacaína al 1.5%. La Jeringa A fue utilizada como control de pH, y las jeringas B y C fueron alcalinizadas adicionando 2 mL de bicarbonato al 8.4%. Fue medido el pH y calculado el porcentaje de base libre asociado en cada jeringa previamente a la alcalinización y posteriormente cada 10 minutos hasta completar una hora, salvo para la jeringa C en los últimos 30 minutos, que permaneció cerrada como control de fuga de CO2. Las soluciones fueron inspeccionadas visualmente durante todo el procedimiento para identificar eventuales precipitados macroscópicos y, tras la hora de estudio, fueron filtradas para indagar sobre la formación de precipitados microscópicos. Tras el filtrado, el pH de cada solución anestésica fue medido de nuevo. Resultados: Tras la alcalinización de la mepivacaína al 1.5% se produjo un aumento inmediato y significativo de los valores de pH y del porcentaje calculado de base libre en las jeringas alcalinizadas B y C con respecto a la de control A, y en todas las jeringas el pH permaneció muy estable durante una hora. Además, a los 60 minutos apenas existieron diferencias entre los valores de pH de las jeringas B y C, lo que indica que no se produjo fuga significativa de CO2. En este tiempo no hubo sospecha de formación de precipitados por inspección visual, y las mínimas diferencias encontradas entre los pesos secos de los filtros indican que no hubo formación de precipitados significativa. Conclusiones: Las soluciones de mepivacaína al 1.5% pueden ser alcalinizadas y permanecer a temperatura ambiente en jeringas

  16. 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.

  17. 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

  18. Determinación de nitrito como metabolito estable del óxido nítrico en el líquido sinovial de articulación metacarpofalángica equina Nitrite determination as a stable metabolite of nitric oxide in synovial fluid of equine metacarpophalangeal joint

    Directory of Open Access Journals (Sweden)

    H Adarmes

    2009-01-01

    Full Text Available La osteoartritis (OA se caracteriza por fibrilación y erosión del cartílago articular. El óxido nítrico (NO• sería un importante mediador biológico de la OA y su producción es significativamente mayor en el cartílago OA. El NO• inhibe la síntesis de matriz cartilaginosa e induce la apoptosis en el cartílago articular. Se determinó indirectamente la producción de NO• a través de la concentración de nitrito utilizando la reacción de Griess. Se comparó la concentración de nitrito del líquido sinovial de la articulación metacarpofalángica equina con diferente condición patológica. La clasificación articular y la edad se determinaron por inspección macroscópica. El grupo normal NN (n = 47 no presentó daño visual de las estructuras articulares. Los grupos con daño articular fueron: a un grupo con membrana sinovial congestiva sin daño del cartílago NA (n = 25, b un grupo con daño del cartílago y con membrana sinovial normal AN (n = 23, y c un grupo con daño del cartílago y con membrana sinovial congestiva AA (n = 15. El cartílago articular dañado presentó erosiones y múltiples líneas de roce y la membrana sinovial dañada presentó aspecto congestivo. No hubo diferencia significativa entre los grupos analizados. Sólo hubo tendencia a aumentar en el grupo NA (44,4 ± 32,6 µmol/L, posiblemente asociado a la integridad del cartílago y a su mayor respuesta al estímulo proinflamatorio de la membrana sinovial congestiva. La concentración de nitrito tendió a disminuir en el grupo con daño de cartílago y membrana sinovial AA (26,3 ± 22,1 µmol/L que se explicaría por la pérdida de cartílago en este modelo in vivo.The striking feature of osteoarthritis (OA is fibrilation and loss of articular cartilage. Nitric oxide (NO• has been involved as an important biological mediator of OA and its production is significantly higher in OA cartilage. NO• suppresses cartilagenous matrix synthesis and induces

  19. Soluciones actuales al problema de la vivienda en Iberoamérica

    Directory of Open Access Journals (Sweden)

    Quintana Uranda, Leandro

    1984-06-01

    Full Text Available This work analyzes the magnitude and characteristics of the housing problem in Latin America and, particularly, in Venezuela, establishing the general guidelines which should characterize solutions in those countries. It describes housing Solutions that are being implemented: those completed, those that can be extended, parceling put and housing estates for the people, housing on slopes, houses which allow for growth, action in stable neighborhoods, credit facilities for the people, an analysis of personal construction or self-administration, programs for rural housing, criteria for urban redevelopment, solutions for emergencies, research into housing material, concluding with orientations towards the future. These reflections are fundamentally derived from experience accumulated by the author, who reached the position of Head of the maximum body of Vivienda Popular {Housing for the People: the «Instituto Nacional de la Vivienda» — INAVI {the National Institute of Housing in Venezuela in 1979 and 1980. It is appropriate to stress the importance which this work gives to the exchange of experience among different Latin American countries with the purpose of establishing typologies for programmes which may help to solve the habitation problem for their inhabitants.El trabajo presentado analiza la magnitud y características del problema habitacional en Iberoamérica y, especialmente, en Venezuela, estableciendo las directrices generales que deben caracterizar las soluciones en esos países. Describiendo soluciones habitacionales que se están implementando: completas, ampliables, parcelamientos y urbanizaciones populares, viviendas en pendiente, viviendas crecedoras, acciones en barrios estables, créditos populares, análisis de la autoconstrucción o autogestión, programas de vivienda rural, criterios de renovación urbana, soluciones para emergencias, la investigación en materia habitacional y concluyendo con orientaciones hacia el

  20. Evaluación y selección de un protocolo vía Agrobacterium para la incorporación de resistencia al cogollero en la variedad de tomate Unapal-Arreboles

    Directory of Open Access Journals (Sweden)

    Vallejo Cabrera Franco Alirio

    2009-06-01

    Full Text Available Se evaluó y seleccionó una metodología para la transformación genética de la variedad de tomate UNAPAL-Arreboles con el gen cry1Ab para la incorporación de resistencia al cogollero (Tuta absoluta, utilizando el sistema de Agrobacterium. Se regeneraron 59 plantas transgénicas a partir de 3.200 explantes (1.84%. La integración estable, expresión y herencia de los genes nptII y gus-intrón, se demostraron mediante análisis histoquímico y molecular en los clones To28, To33 y To47 y en la correspondiente generación T1. Sin embargo, los análisis molecular e inmunológico indicaron ausencia del gen cry1Ab sugiriendo que la secuencia de este gen se puede haber modificado.

  1. A dieta com baixo teor de sódio é de fato indicada para todos os pacientes com insuficiência cardíaca estável? ¿La dieta con bajo nivel de sodio es de hecho una recomendación que sirve a todos los pacientes con insuficiencia cardíaca estable? Is the low-sodium diet actually indicated for all patients with stable heart failure?

    Directory of Open Access Journals (Sweden)

    Miyoko Nakasato

    2010-01-01

    Full Text Available FUNDAMENTO: Embora uma dietahipossódica seja indicada para a insuficiência cardíaca IC, não há evidência de que esta restrição seja benéfica para todos os pacientes. OBJETIVO: Estudar prospectivamente os efeitos agudos de uma dieta hipossódica em pacientes (pcs com insuficiência cardíaca (IC. Métodos: Cinqüenta pacientes ambulatoriais estáveis, com IC leve a moderada, que relataram consumir previamente 6,6 g sal/dia foram estudados. Na Fase 1, todos os pcs foram submetidos a uma dieta com 2 g de sal durante 7 dias, seguido por randomização em dois subgrupos (fase 2, para receber 6 g de sal/dia (subgrupo 1 ou 2 g de sal/dia, por 7 dias (subgrupo II. RESULTADOS: Fase 1: a dieta com 2 g de sal/dia reduziu o índice de massa corporal (IMC, sódio plasmático e sódio urinário, consumo de proteína, ferro, zinco, selênio e vitamina B12; aumentou os níveis plasmáticos de norepinefrina, nitrato, aldosterona sérica, e melhorou a qualidade de vida. Fase 2: para pcs com IMC baixo, o uso de 6 g de sal/dia diminuiu de forma aguda os níveis de norepinefrina, albumina e colesterol no plasma. Nenhuma diferença foi encontrada em pcs com IMC mais alto. CONCLUSÃO: A dieta com 2g de sal /dia para pcs com IC aumentou a ativação neuro-hormonal associada à progressão da IC. O IMC pode influenciar a resposta da ativação neurohormonal em uma dieta hipossódica na IC. Futuros estudos para testar a restrição à ingestão de sal por períodos mais longos são recomendados.FUNDAMENTO: Aunque se indica una dieta hiposódica para la IC, no hay evidencia de que esta restricción es beneficiosa para todos los pacientes. OBJETIVO: Estudiar prospectivamente los efectos agudos de una dieta hiposódica en pacientes (pcs con insuficiencia cardíaca (IC. MÉTODOS: Fueron estudiados cincuenta pacientes ambulatorios estables con IC leve a moderada, que relataron consumir previamente 6,6 g sal/día. En la fase I, todos los pcs fueron sometidos a una

  2. Evaluación de los cambios en algunas propiedades físicas y químicas de un ultisolpor efecto del Bacillus subtilis

    Directory of Open Access Journals (Sweden)

    Gladys Elena Acosta Olaya

    2010-12-01

    Full Text Available Título en inglés: Evaluation of the changes in the some physical and chemical properties of an ultisol for effect of the Bacillus subtilis Resumen El interés en estudios de biorremediación de suelos deteriorados por sobreexplotación y uso indiscriminado de agroquímicos se debe a que alteran la microflora, el sistema de autorregulación y la sustentabilidad en el largo plazo. Un Ultisol, suelo de baja fertilidad química y sometido a reducción de tamaño de agregados (<2,0 mm, solarizado para reducir la población microbiológica, fue inoculado con la bacteria Basillus subtilis en concentraciones de 106, 107, 108, 109 unidades formadoras de colonias (ufc. En 120 días se observó un incremento importante en magnitud de: estabilidad estructural, tamaño promedio de agregados, pH, fósforo disponible y una disminución del aluminio intercambiable. Estas variaciones en la respuesta estuvieron relacionadas con la actividad de los microorganismos en el suelo, y responden a la capacidad de solubilización de minerales por la bacteria, de producción de condiciones alcalinas y de biofilms, que unidos al aumento de biomasa de raíces de la planta, mucílagos y carbohidratos, coadyuvan en la formación de agregados estables y de mayor tamaño. Las propiedades físicas y químicas al final del experimento se estabilizaron en valores mayores a los encontrados en el suelo inicial, produciendo un efecto positivo general sobre el mismo, desde el punto de vista de la fertilidad global, al aumentar el fósforo disponible, disminuir la acidez intercambiable e incrementar la estabilidad y el tamaño promedio de agregados del suelo a corto plazo. Palabras clave: bacteria calcificante; biofilms; tamaño de agregados. Abstract The interest about the studies of bioremediation in deteriorated soils under and over exploitation, indiscriminate use of agrochemicals that alter the microflora, the self regulation system and the sustainability in the long term. An

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

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    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

  4. 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

  5. Formação e estabilização de agregados do solo influenciados por ciclos de umedecimento e secagem após adição de compostos orgânicos com diferentes características hidrofóbicas Soil aggregate formation and stabilization as influenced by wetting drying cycles and organic compounds with different hydrophobic characteristics

    Directory of Open Access Journals (Sweden)

    Renato Saldanha Bastos

    2005-02-01

    Full Text Available A adição de compostos orgânicos e os ciclos de umedecimento e secagem do solo têm influência marcante na agregação do solo. Este trabalho objetivou estudar o efeito do tempo de incubação e a influência dos ciclos de umedecimento e secagem sobre a ação de compostos orgânicos com características hidrofóbicas e hidrofílicas na agregação de um Latossolo Vermelho-Amarelo distrófico. Os tratamentos dos experimentos de períodos de incubação e de ciclos de umedecimento e secagem seguiram esquema fatorial incompleto 2 x 3[(4-1 + (4-1]. Os fatores foram: TFSA de dois horizontes (A e B, três períodos de incubação (40, 80 e 160 dias, três compostos orgânicos (amido, ácido esteárico e ácido húmico, em combinações de ausência e presença de amido e ácido húmico (Am e AH, (4-1 e de ácido esteárico e ácido húmico (E e AH, (4-1. Todas as unidades experimentais foram mantidas em incubadora de DBO a 25 ºC e em ambiente natural, quando foram submetidas a 5, 11 e 22 ciclos de umedecimento e secagem, de acordo com os períodos de incubação. Após incubação, as amostras de agregados foram analisadas quanto ao diâmetro médio ponderado, diâmetro médio geométrico, índice de estabilidade de agregados e grau de repelência à água. Os resultados indicaram que a aplicação, mesmo em longos períodos de incubação, de compostos orgânicos com caráter hidrofóbico acentuado mostrou efeito marcante na melhoria da estabilidade em água do agregados, sendo sua melhor resposta na dose de 5,5 g kg-1. Para melhorar a agregação, a aplicação de compostos orgânicos hidrofílicos deve ser contínua e com períodos de incubação de no máximo 40 dias. Os ciclos de umedecimento e secagem reduziram os efeitos dos compostos orgânicos adicionados sobre a agregação.The input of organic compounds in agriculture and the soil wetting and drying cycles have a strong influence on soil aggregation. This study investigated the effect

  6. 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.

  7. 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...

  8. 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.

  9. 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...

  10. 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 ...

  11. 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...

  12. 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.

  13. Establıshment Of Ankara University Faculty Of Health Sciences Students Breakfast Habits

    OpenAIRE

    FAYDAOĞLU, Emine; ENERGİN, Esma; SÜRÜCÜOĞLU, Metin Saip

    2013-01-01

    The purpose of this research was to determine the breakfast habits of the students being educated in the Faculty of Health Sciences, at Ankara University. The research population consisted of ten students from each undergraduate class of the Departments of Nutrition and Diatetics, Nursing, Midwifery, Social Service and Medical Institution Management and Pediatric Development of the Faculty of Health Sciences, making up 220 voluntary students in total. The individuals who participated in the r...

  14. Isótopos estables como trazadores de la influencia aviar en suelos y plantas

    OpenAIRE

    García, Luis V.

    2008-01-01

    19 páginas, 5 figuras, 3 tablas, 51 referencias. El libro consta de 399 páginas. Pertenece a la Colección Cuadernos de Apoyo 22. El autor agradece los comentarios y correcciones de Teodoro Marañón y de Ramón Redondo durante la preparación del manuscrito.

  15. Un metodo estable para la evaluacion de la complejidad algoritmica de cadenas cortas

    CERN Document Server

    Zenil, Hector

    2011-01-01

    It is discussed and surveyed a numerical method proposed before, that alternative to the usual compression method, provides an approximation to the algorithmic (Kolmogorov) complexity, particularly useful for short strings for which compression methods simply fail. The method shows to be stable enough and useful to conceive and compare patterns in an algorithmic models. (article in Spanish)

  16. Primeros resultados de isótopos estables para el sur mendocino

    OpenAIRE

    Novellino, Paula; Guichón, Ricardo Aníbal

    1999-01-01

    Para la región de Cuyo, a partir del estudio del registro arqueológico y la información etnográfica disponible, han sido planteadas distintas formas de subsistencia (cazadora-recolectora, agrícola y variadas situaciones de interacción y formas intermedias). En 1995, con el fin de contar con información independiente sobre esta diversidad de formas de vida en el pasado, se integró un proyecto de Antropología Biológica destinado a incluir el registro biológico humano a la discusión (PIP-CONICET...

  17. 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...

  18. 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}.

  19. 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...

  20. 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.

  1. 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

  2. Validación al español de la escala de auto percepción de carga de cuidado Validação em espanhol da escala de auto percepção do peso dos cuidados Spanish validation of the "self-perception of burden of care scale"

    Directory of Open Access Journals (Sweden)

    María Cecilia Arechabala

    2012-01-01

    Full Text Available OBJETIVO: Validar al español la "Escala de Auto percepción de Carga" de Cousineau (2003 en su versión larga. MÉTODOS: La muestra estuvo formada por 161 pacientes sometidos a HDC. La escala se tradujo al español, se realizó una aplicación piloto en 10 pacientes y a continuación se elaboró el instrumento final que fue sometido al proceso de validación. RESULTADOS: La confiabilidad de la escala se mantuvo estable al ir eliminando cada uno de los ítems, fluctuando el Alpha de Cronbach entre 0.903 y 0.915. Por lo anterior, se decide mantener los 25 ítems originales en la versión en español. CONCLUSIÓN: La confiabilidad total del instrumento fue de 0.91, muy cercana a la obtenida en la versión original (0.93.OBJETIVO: Validar, en la lengua española, la versión amplia de la "Escala de Autopercepción de carga de los cuidados" de Cousineau et al. MÉTODOS: La muestra estuvo constituída por 161 pacientes sometidos a hemodiálisis crónica en cinco Centros de Diálisis de la ciudad de Santiago - Chile. Esa Escala fue traducida al español y fue realizado un test piloto con diez pacientes; después de este procedimiento, se elaboró el instrumento final sometido al proceso de validación. RESULTADOS: La confiabilidad de la escala se mantuvo estable, con fluctuación del coeficiente alpha de Cronbach entre 0,903 y 0, 915, decidiéndose así, por mantener los 25 items originales en la versión en español. CONCLUSIÓN: La confiabilidad total del instrumento fue de 0,91, muy próxima de la obtenida en la versión original (0,93.OBJECTIVE: To validate the Spanish language version of the broad "self-perception of burden of care scale" by Cousineau et al. METHODS: The sample consisted of 161 patients undergoing chronic hemodialysis at five dialysis centers in the city of Santiago - Chile. This scale was translated into Spanish and a pilot test was conducted with ten patients; after this procedure, we developed the final instrument to be

  3. 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

  4. 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.

  5. Modelo de capacitación para el tratamiento integral de pacientes con trastornos de la conducta alimentaria resistentes al cambio Training model for integral treatment of patients with eating disorders resistant to change

    Directory of Open Access Journals (Sweden)

    R. Calvo Sagardoy

    2012-06-01

    Full Text Available La necesidad de buscar tratamientos eficaces para los pacientes con Anorexia o Bulimia nerviosa ha inducido a los profesionales que les atienden a elaborar nuevas formas de tratamiento que tengan en cuenta las variables causantes de su resistencia al cambio. Los pacientes del presente estudio (2006-2009 presentan las siguientes características: 340 pacientes que llevan 7 o más años de evolución y/ o han intentado numerosos tratamiento previos sin que se haya logrado iniciar y/o mantener los cambios deseados, que les hayan permitido recuperarse de forma estable. En cuanto al tratamiento propuesto, la relación paciente-equipo terapéutico se apoya en los principios del modelo de capacitación. Éste, considera al paciente de forma integral, le informa y le provee de recursos para que incremente su compromiso de cambio. Enseña al paciente a cuidarse física y psíquicamente como medio de recuperar su salud y salir del trastorno de forma estable. Incluye a los familiares como apoyo esencial en la recuperación de su allegado/a. Los terapeutas requieren amplia experiencia en el tratamiento de TCA, flexibilidad, capacidad para integrarse con otros compañeros aunque utilicen modelos teóricos diferentes, habilidades para realizar sesiones grupales, capacidad para manejar emociones negativas y tolerancia a la frustración. Finalmente, el modelo que a continuación se presenta se ha puesto en práctica, ha recuperado a pacientes cuya permanencia en el trastorno superaba 15 años de evolución y laboralmente tenían la invalidez permanente.The need to find effective treatments for patients with Anorexia or Bulimia nervosa has led to the professionals who care for them to develop new forms of treatment that take into account the variables that cause resistance to change. Patients in this study (2006-2009 have the following characteristics: 340 patients who have 7 or more years of evolution and/or have tried numerous previous treatments without

  6. 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...

  7. 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

  8. O limiar de esforço percebido (LEP corresponde à potência crítica e a um indicador de máximo estado estável de consumo de oxigênio El umbral de esfuerzo percibido (UEP corresponde a la potencia crítica y a un indicador de máximo estado estable de consumo de oxigeno The perceived exertion threshold (PET corresponds to the critical power and to an indicator of maximal oxygen uptake steady state

    Directory of Open Access Journals (Sweden)

    Fábio Yuzo Nakamura

    2005-06-01

    -se que o LEP prediz de forma acurada a intensidade de PCrit e PCrit'.El esfuerzo percibido viene sido blanco de diversas investigaciones, generalmente asociándolo a indicadores fisiológicos objetivos en el ejercicio. Recientemente, fué propuesta a la identifica ción del humbral de esfuerzo percibido (UEP en carrera acuática, e la cual no difirió de la velocidad crítica. En teoría, ambos parámetros serían indicadores de máximo estado estable de variables como el VO2 y el lactato sangüíneo. Este trabajo ha tenido como objetivo verificar la coincidencia entre UEP, potencia crítica (PCrit y un indicador de máximo estado estable de VO2 (PCrit' en cicloergómetro. Ocho participantes de sexo masculino fueron sometidos a test de esfuerzo progresivo para determinación del VO2pico (46,7 ± 8,5 ml/kg/min, y a cuatro tests rectangulares exhaustivos para estimar los parámetros del modelo de potencia crítica, UEP y PCrit'. La relación hiperbólica entre potencia mecánica y tiempo hasta que el VO2pico fuera alcanzado en cada test fué utilizada para la estimativa de la PCrit', tenida como la asíntota en el eje de la potencia y la porción de la capacidad de trabajo anaerobico (CTAnaer depletada hasta el establecimiento del VO2pico (CTAnaer'. Para identificar el UEP, los coeficientes angulares de las rectas de aumento de esfuerzo percibido en el tiempo (ordenada y de las potencias utilizadas (abscisas fueron ajustados a una función lineal que sería mantenido estable indefinidamente. Los parámetros PCrit y CTAnaer fueron estimados por medio de la ecuación no lineal de potencia en función de tiempo. Para comparación de las estimativas de UEP, PCrit y PCrit' fué empleado ANOVA para las medidas repetidas, y las asociaciones fueron establecidas por correlación de Pearson. CTAnaer y CTAnaer' fueron comparadas por el test t. El UEP (180 ± 61, PCrit (174 ± 43 y PCrit' (176 ± 48 no difirieron significativamente, y las correlaciones de 0,92-0,98. CTAnaer' (14.080

  9. 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.

  10. 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

  11. 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...

  12. 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.

  13. 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...

  14. 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....

  15. Catalizadores de Pd soportados en óxidos mixtos Al-Mg: síntesis, caracterización y actividad

    Directory of Open Access Journals (Sweden)

    C. Calderón

    2001-01-01

    Full Text Available Se prepararon soportes de óxidos mixtos Al-Mg con diferente composición empleando los métodos de coprecipitación y de sol-gel. La caracterización de estos materiales se llevó a cabo por absorción atómica, análisis térmico DTA / TGA, difracción de rayos- X y fisisorción de N2. Con los soportes calcinados a 600 ºC se prepararon catalizadores de paladio (1 % mediante impregnación, posteriormente se calcinaron y se redujeron a 500 ºC. La evaluación de los catalizadores se efectuó en la deshidrogenación normal de propano a 500 ºC y presión atmosférica. Por el método de sol-gel se obtuvieron sólidos con una mayor superficie específica y una mayor homogeneidad en la distribución porosa comparados con los de coprecipitación. A pesar de la baja temperatura de calcinación, los principales compuestos fueron la espinela de MgAl2O4 y fases libres de MgO y de Al2O3, dependiendo de la composición de los soportes. Aparentemente, la mayor conversión se tiene cuando el paladio se soporta en estructuras estables (espinelas y se tiene una baja interacción con el soporte, por tal motivo los catalizadores de Pd soportados en los óxidos mixtos coprecipitados fueron más activos que en los de sol-gel. La selectividad a propileno varió en el intervalo de 57-93 %, lo que se explicó en función de la acidez total. La mayor desactivación se observó con los catalizadores empleando soportes sol-gel.

  16. 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

  17. El enfoque de sistemas y de contingencias aplicado al proceso administrativo

    Directory of Open Access Journals (Sweden)

    Francisco Velásquez V.

    2000-01-01

    Full Text Available El presente artículo corresponde a una reflexión sobre el proceso administrativo de las organizaciones (las funciones de planeación, organización, dirección o influencia y control desde la perspectiva del enfoque de sistemas y de contingencias. Para ello se abordan los planteamientos más representativos de los distintos enfoques, desde el enfoque clásico, hasta los aportes más contemporáneos. El artículo finaliza con una descripción del proceso administrativo según la tipología de la organizaciín (mecánico- estable y orgánica-adaptativa y las implicaciones que tiene para la gerencia. El enfoque de sistemas para la administración se fundamenta en la teoría general de sistemas. Ludwig von Bertalanffy, científico que trabajó principalmente en las áreas de la fisica y de la biología, ha sido reconocido como el fundador de la teoría general de sistemas. Bertalanff! elaboró una teoría interdisciplinaria capaz de trascender los problemas exclusivos de cada ciencia y de proporcionar principios (sean físicos, biológicos, psicológicos, sociológicos, químicos, etc. y modelos generales para todas las ciencias involucradas, de forma tal que los descubrimientos efectuados por cada ciencia pudieran ser utilizados por los demás. La Teoría General de la Administración experimentó una gradual y creciente ampliación de enfoque, desde el enfoque clásico, el enfoque de las relaciones humanas y el enfoque holístico. El enfoque clásico mediante la concepción de la organizaciín formal y técnica buscó dar respuesta a los problemas de productividad y eficiencia organizacional. En este enfoque es muy clara la contribución de la ingeniería y el supuesto de que la única motivación de los individuos en las organizaciones es la motivación económica. El enfoque de las relaciones humanas trabajó sobre la organización informal y con "rostro humano" y también buscó dar respuestas a los problemas de productividad y efrciencia

  18. 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...

  19. Wangwen shengyi o traducir al pie de la letra catálogos de empresas del español al chino

    OpenAIRE

    Lu, Yan; Rovira-Esteva, Sara

    2009-01-01

    La globalización acelera cada vez más los contactos comerciales entre las empresas chinas, españolas e iberoamericanas. La traducción de los documentos de presentación de una empresa y de sus productos es muy importante para que las dos partes se conozcan mutuamente, establezcan buenas relaciones y hasta lleguen a ser socios estables. Sin embargo, a causa de las diferencias estructurales y culturales entre el español y el chino, así como por las limitaciones del propio traductor, muchas veces...

  20. 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.

  1. 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...

  2. 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.

  3. 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.

  4. 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...

  5. 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...

  6. 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.

  7. 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.

  8. 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. 

  9. 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.

  10. 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 ...

  11. 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 ...

  12. 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.

  13. Cambios en las propiedades físicas de un Inceptisol por la adición de substrato degradado con el hongo Pleurotus ostreatus

    Directory of Open Access Journals (Sweden)

    Gómez Carabalí Arnulfo

    2010-03-01

    Full Text Available Para evaluar el efecto del substrato orgánico (aserrín de madera y ‘estopa’ de coco enriquecido con 40% de volúmenes iguales de hojas de plátano (Mussa sp., kudzú tropical (Pueraria phaseoloides y botón de oro (Tithonia diversifolia degradado por el hongo Pleurotus ostreatus (SDP sobre algunas propiedades físicas de un Inceptisol de Buenaventura, Valle del Cauca, Colombia, se incorporaron dosis crecientes de éste (0, 1.25, 2.5, 5, 10, 20, 40 y 80 g/kg en el suelo tamizado en malla de 2 mm. La mezcla se utilizó en materos sembrados con maíz durante 4 meses, momento en el cual se tomaron muestras para determinar los cambios en las propiedades del suelo. Se usó un diseño completamente al azar, con ocho tratamientos, cuatro repeticiones y dos profundidades de muestreo. La correlación entre la cantidad de SDP incorporado y la mayoría de propiedades físicas evaluadas fue altamente significativa. Comparadas con el control (sin SDP, las dosis de 20, 40 y 80 g/kg redujeron significativamente la densidad aparente del suelo, al tiempo que incrementaron la porosidad total, la macroporosidad, la retención de humedad a bajas tensiones y el contenido de materia orgánica. En las dosis de 40 y 80 g/kg se observó una reducción significativa de la susceptibilidad a la compactación, lo mismo que un incremento en el diámetro promedio ponderado de los agregados estables al agua. Los incrementos de la conductividad hidráulica saturada y la permeabilidad al aire no fueron significativos en relación con el control.

  14. Cambios en las propiedades físicas de un Inceptisol por la adición de substrato degradado con el hongo Pleurotus ostreatus

    Directory of Open Access Journals (Sweden)

    Herminio Paredes Valencia

    2010-01-01

    Full Text Available Para evaluar el efecto del substrato orgánico (aserrín de madera y 'estopa' de coco enriquecido con 40% de volúmenes iguales de hojas de plátano (Mussa sp., kudzú tropical (Pueraria phaseoloides y botón de oro (Tithonia diversifolia degradado por el hongo Pleurotus ostreatus (SDP sobre algunas propiedades físicas de un Inceptisol de Buenaventura, Valle del Cauca, Colombia, se incorporaron dosis crecientes de éste (0, 1.25, 2.5, 5, 10, 20, 40 y 80 g/kg en el suelo tamizado en malla de 2 mm. La mezcla se utilizó en materos sembrados con maíz durante 4 meses, momento en el cual se tomaron muestras para determinar los cambios en las propiedades del suelo. Se usó un diseño completamente al azar, con ocho tratamientos, cuatro repeticiones y dos profundidades de muestreo. La correlación entre la cantidad de SDP incorporado y la mayoría de propiedades físicas evaluadas fue altamente significativa. Comparadas con el control (sin SDP, las dosis de 20, 40 y 80 g/kg redujeron significativamente la densidad aparente del suelo, al tiempo que incrementaron la porosidad total, la macroporosidad, la retención de humedad a bajas tensiones y el contenido de materia orgánica. En las dosis de 40 y 80 g/kg se observó una reducción significativa de la susceptibilidad a la compactación, lo mismo que un incremento en el diámetro promedio ponderado de los agregados estables al agua. Los incrementos de la conductividad hidráulica saturada y la permeabilidad al aire no fueron significativos en relación con el control.

  15. 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...

  16. 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.

  17. 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.

  18. 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

  19. 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...

  20. 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

  1. 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.

  2. 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...

  3. 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.

  4. 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.

  5. 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 ...

  6. 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.

  7. 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

  8. Análisis de la transmitancia térmica y resistencia al impacto de los muros de quincha

    Directory of Open Access Journals (Sweden)

    Cuitiño, G.

    2015-03-01

    Full Text Available Wattle construction is a mixed technique used on walls and that belong to the frameworks family. It is constructed with a structural frame (wood or bamboo filled in with a mixture of clay mud in a plastic state and vegetable fiber. In this paper thermal transmittance and soft shock resistance had been studied, thermal transmittance had been measured with wattle samples of 0.10 m thickness, and result in 2.64 W/m2K and with the addition of expanded polystyrene sheet of 5 mm thicknees inside the panel, the transmittance was 2.02 W/m2K. These values are batter than a brick wall of 0.20 m thick with a finish plaster on both sides of the wall, whose value is 4.13 W/m2K. For impact resistance, panels were constructed and tested to soft shock, on 1:1 scale. The permanent deformation in all cases was less than 3.6 mm required by the current standard. This implies that there was no appreciable deformations suffered enclosures providing security to a home. It’s concludes that has a good thermal and structural behavior, plus the characteristics of being economical and appropriate for selfconstruction, make feasible to implement as a massive scale.La quincha es una técnica mixta de muros perteneciente a la familia de los entramados. Compuesta de una armazón estructural (madera o bambú rellena con barro en estado plástico con añadido de fibras vegetales. Se determinó que la transmitancia térmica de un panel de quincha de 0,10 m de espesor, dando como resultado 2,64 W/m2K y con el agregado de una placa de poliestireno expandido de 5 mm de espesor en el interior el panel, la transmitancia es 2,02 W/m2K. Estos valores son comparables al de un muro de ladrillo de 0,20 m de espesor y revocado en ambas caras, cuyo valor es 4,13 W/ m2K. Para la resistencia al impacto, se construyeron paneles en escala 1:1 y se ensayaron al choque blando. Las deformaciones permanentes fue en todos los casos menor de 3,6 mm requerido por la Norma vigente. Esto implica que no

  9. 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...

  10. 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%.

  11. 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.)

  12. 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.

  13. 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.

  14. 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.

  15. 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

  16. 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)

  17. 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。

  18. 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.

     

  19. 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.)

  20. 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

  1. 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.

  2. 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.

  3. 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.)

  4. 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.

  5. 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...

  6. 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

  7. 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)

  8. 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.

  9. 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)

  10. 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.

  11. 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.

  12. 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,...

  13. 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

  14. Influência da temperatura de infiltração de alumínio gasoso em ligninocelulósicos nas propriedades de Al2O3 biomórfica Effect of the temperature of aluminum gas infiltration into lignocellulosic preforms on the properties of biomorphic Al2O3

    Directory of Open Access Journals (Sweden)

    T. E. Andrade Jr.

    2007-03-01

    Full Text Available A conversão de materiais ligninocelulósicos em cerâmicas biomórficas tem despertado particular interesse, por tratar-se de uma nova classe de materiais cerâmicos de alto valor agregado, produzidos a partir de matérias-primas de baixo custo e relevante papel econômico. Cerâmicas biomórficas são obtidas por meio do processo de biomodelagem, que consiste na reprodução ao nível micrométrico da estrutura natural do material de partida. Neste trabalho, os materiais ligninocelulósicos utilizados como material de partida foram fibras de sisal, ratam e pinheiro. Estes foram convertidos por pirólise em pré-formas de carbono. Subseqüentemente, essas pré-formas foram infiltradas com alumínio gasoso em temperaturas que variaram de 1400 ºC a 1600 ºC sob vácuo, obtendo-se assim carbeto de alumínio (Al4C3. Por ser um material frágil e de rápida decomposição, O Al4C3 foi rapidamente oxidado a 1600 ºC para sua conversão total em fibras de Al2O3 biomórfica. A microestrutura e morfologia das cerâmicas biomórficas obtidas foram caracterizadas por microscopia eletrônica de varredura e por difração de raios X. O estudo comparativo da infiltração de alumínio gasoso foi realizado com base em resultados obtidos por análise termogravimétrica.The reproduction of lignocellulosic structures into biomorphous ceramics has been extensively studied since it results in added-value products from relatively inexpensive raw materials. Synthetic ceramics can be obtained by biotemplating maintaining the structural features of native wood or fibers. In the present study, lignocellulosic materials, i.e, sisal, rattan and pinnus, were used to produce alumina fibers. The natural structures were pyrolized into carbon prefoms and subsequently infiltrated with aluminum gas temperatures ranging from 1400 ºC to 1600 ºC under vacuum, resulting in aluminum carbide (Al4C3. Because of its brittle nature and fast decomposition, Al4C3 was quickly oxidized

  15. 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)

  16. 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

  17. 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.

  18. 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

  19. 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 ...

  20. 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

  1. 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

  2. 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)

  3. Associated Factors to Human Papilloma Virus. A study performed in Health Area V, in Cienfuegos, Cuba. Factores asociados al virus del papiloma humano. Área V. Cienfuegos.

    Directory of Open Access Journals (Sweden)

    Adys Castro Barberena

    2008-06-01

    Full Text Available Background: Human Papilloma Virus has been considered as the precursor of flat lesions in the cervical epithelium which develops Cervix uterine cancer. Objectives: to analyze risk factors associated to infections due to human papilloma virus. Method: An ambispective, descriptive study was carried out from January 2003 to January 2004, taking 60 patients whose Papanicolaou smears were abnormal. All these patients belonged to health area V, in Cienfuegos, Cuba. A guide for interview with different variables was used. Results: infected predominant ages were from 30 to 39 years old. 55% of the patients are married women or with stable sexual relationships. 6 patients comprised between 40 to 59 years old were observed with association to intra epithelium cervix neoplasias. For a 10 % of them, they have had from 3 to 12 sexual partners. The starting age to have sexual intercourse is from 15 to 19 years old. 75 % of the patients are smokers. Conclusions: results coincide with the medical literature reviewed regarding risk factors and its important relationship with NIC and so the cervicouterine cancer genesis.
    Fundamento: El virus del papiloma humano se ha considerado el precursor de lesiones planas en el epitelio cervical las cuales desarrollan el Cáncer Cervico uterino. Objetivo: Analizar los factores de riesgo asociados a la infección por virus del papiloma humano. Método: Se realiza un estudio investigativo, descriptivo, ambiespectivo, a partir de Enero del 2003 a Enero del 2004 comenzando en Enero 2003 estudiando 60 pacientes con citologías anormales, correspondientes al Área V del Municipio de Cienfuegos. Se empleo una guía de entrevistas con diversas variables. Resultados: Las edades predominantes de esta infección es de 30 – 39 años, el 55% son mujeres casadas o con relaciones

  4. 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.

  5. 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.

  6. 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

  7. 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…

  8. 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

  9. 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

  10. 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...

  11. 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.

  12. 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.

  13. 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.

  14. 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)

  15. 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 ...

  16. 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

  17. 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-...

  18. 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

  19. 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.)

  20. Del campo a la ciudad, el paisaje y la identidad en el Valle del Río Pardo, al norte de Minas Gerais, Brasil

    Directory of Open Access Journals (Sweden)

    Fabiana Oliveira Araujo

    2014-11-01

    Con la llegada de la minería, un gran número de agricultores cambiará la incertidumbre del campo por un trabajo estable en las empresas mineras. En este trabajo se analizan las consecuencias en el paisaje cultural del Valle del Río Pardo, provocadas por esta transformación de la actividad económica de la población.

  1. 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.

  2. 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.' ' '

  3. 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.

  4. 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.

  5. 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

  6. 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

  7. 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.

  8. El envejecimiento y las oportunidades económicas: las principales regiones del mundo al final del siglo

    OpenAIRE

    Behrman, Jere R.; Suzanne Duryea; Miguel Székely

    1999-01-01

    (Disponible en idioma inglés únicamente) En este trabajo se presentan nuevos elementos de juicio sobre las principales regiones del mundo y los países más poblados de cada región, y las relaciones entre las edades promedio de esas poblaciones y tres grupos de resultados económicos: 1) agregados macroeconómicos (ahorro doméstico como proporción del PIB, PIB per cápita, capital por trabajador e ingresos tributarios como porcentaje del PIB); 2) gasto gubernamental en educación y salud, y 3) indi...

  9. 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...

  10. 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...

  11. 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.

  12. 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.

  13. 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...

  14. 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.

  15. 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.

  16. 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.

  17. Análisis de los estudios clínicos sobre la eficacia de las técnicas alternativas al formocresol en las pulpotomías de dientes temporales Analysis of clinical studies on the effectiveness of alternatives to formocresol in primary tooth pulpotomies

    Directory of Open Access Journals (Sweden)

    J Calatayud

    2006-08-01

    Full Text Available Después de analizar los estudios clínicos de las técnicas de pulpotomía en dientes temporales alternativas al formocresol: hidróxido de calcio, electrocoagulación, glutaraldehido, sulfato férrico y Mineral Trióxido Agregado (MTA, hemos llegado a la conclusión de que las tres últimas son las mejores alternativas por presentar los mejores resultados y tener menor número de fracasos a lo largo del tiempo. En general todas tienden a empeorar sus resultados a medida que pasa el tiempo, desde un éxito clínico del 95-100% a los seis meses hasta un 80-90% a los tres años, excepto con MTA que en los pocos estudios clínicos existentes continúa manteniendo un resultado excelente (100% a los dos años.After analyzing clinical studies on alternatives to formocresol in primary tooth pulpotomies-calcium hydroxide, electrosurgery, glutaraldehyde, ferric sulphate and Mineral Trioxide Aggregate (MTA the authors conclude that the last three are the most effective, as they present the best early results and the smallest number of failures over time. Generally speaking, the clinical success rate declines in all these techniques with time, from 95-100% after six months to 80-90% after three years. The only exception is MTA, which continues to exhibit excellent results (100% success after two years, according to the fairly small number of clinical studies published.

  18. 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

  19. 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.

  20. 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 ...

  1. 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 ...

  2. 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 ...

  3. 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

  4. 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

  5. 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

  6. 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.

  7. 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...

  8. 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...

  9. 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...

  10. 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...

  11. 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...

  12. 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

  13. 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.

  14. 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

  15. 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.

  16. 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.

  17. 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.

  18. 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

  19. 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

  20. 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

  1. 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

  2. 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.

  3. 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.

  4. 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

  5. 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)

  6. 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.

  7. 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

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. Isótopos estables en el estudio de transferencias de elementos en sistemas ave-suelo-planta.

    OpenAIRE

    García, Luis V.

    2005-01-01

    20 páginas, 4 tablas, 7 figuras, 46 referencias. Las Jornadas se celebraron en Noviembre de 2005 en la UAM. Forma parte del Capítulo: Transferencias de elementos en sistemas ave-suelo-planta. Este libro de resúmenes tiene 366 páginas.

  14. Control cinemático y de fuerza de una mano robótica para el agarre estable

    OpenAIRE

    Samper Escudero, José Luis

    2015-01-01

    Este proyecto tratar de allanar el camino para futuros desarrollos que involucren alguno de los pilares fundamentales del mismo; detección, posicionamiento y reconocimiento de objetos por medio de Point Cloud Library, uso de la mano Shadow Hand UPCT, uso de ROS y sincronización entre dos robots. Así como la comunicación entre ROS y un robot no embebido en dicho sistema por incompatibilidades. De este modo, el proyecto trata de servir a fines mayores; por un lado, puede de...

  15. Manejo de la EPOC estable en relación con la GOLD: Experiencia en un hospital universitario.

    Directory of Open Access Journals (Sweden)

    Diana Durán

    2009-12-01

    Full Text Available Introduction: This paper presents a prospective and descriptive study discussing the outpatient care plan in a public hospital in Bogotá for patients with stable COPD according with the GOLD recommendations. The paper presents as well the influence of factors such as education, pharmacological treatment, pulmonary rehabilitation and oxygen-therapy. A survey was carried out among patients, and the results were evaluated and validated by a group of experts; a personal data card for the review of clinical records was considered. Materials and methods: This is a three-phase study. On the first phase, selected patients from outpatient care visits were included with a primary diagnosis of COPD on the stable condition stage; these patients had no evident exacerbation in at least one month before the survey. Clinical records, demographic data (gender, age, previous control dates, required examinations, prescribed medicines, referral to pulmonary rehabilitation programs, exercises and domiciliary oxygen-therapy were recorded. On the second phase, the survey was carried out among 61 adult patients who met the inclusion criteria and the clinical record register. On the third phase, the analysis and interpretation of the results were carried out with a statistic processing of the information, which considers multivariate and univariate data analysis using the software SPSS version 11.5 for Windows. Results: The number of patients with COPD diagnosis studied during the research period of time in our hospital outpatient service was 69, however only 61 of them fulfilled all the inclusion criteria. Sixty-one patients were interviewed, average age, 73. Seventy percent were female. Fifty percent of the participants were from low schooling, social and economic segments of the population; 50% had no formal education and 93% were family dependent. The major risk factor reported (84% was wood fire smoke, with an average exposure of more than 20 years (72%. Thirty percent considered that they had been educated about their disease by a physician, 47% used inhaled bronchodilators, 48% of whom had difficulties to obtain them. Although 56% of all patients were using home oxygen therapy, and 93% suffered some degree of dyspnea, only one patient had undergone pulmonary rehabilitation. Conclusions: Our study revealed that non pharmacological therapy and patient education do not meet GOLD recommendations at a Colombian public hospital; this is due, in part, to inadequacies of the public health system and accessibility to it, lack of clinical guidelines, scant medical referral and heavy patients load. It is necessary to implement an improvement plan that will enhance COPD patient treatment and expand heath care professionals participation in it.

  16. Nuclear reactions with radioactive and stable beams (Part II); Reacciones nucleares con haces radiactivos y estables (Parte II)

    Energy Technology Data Exchange (ETDEWEB)

    Aguilera R, E.F.; Martinez Q, E.; Gomez C, A.; Lizcano, D. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2005-12-15

    At the present time there is a great interest at world level in experiments, with accelerated nuclei of short half life. The dispersion, fusion, transfer and break processes in the interaction of weakly light projectiles bounded with targets of Z great its have been object of intense recent investigation, at world level. Our group, in collaboration with the University of Notre Dame, it has measured and analyzed these processes for weakly bound systems as: {sup 6}He + {sup 209}Bi, {sup 8}Li + {sup 208}Pb, {sup 10}Be + {sup 208}Pb. On the other hand a research line that has wakened up great interest, it is that of studies of resonant reactions using the Inverse Kinematics technique with thick targets. The use of this technique allows to measure an entire excitation function with a single bombardment. Our group has carried out, in the ININ, preliminary bombardments for the system {sup 12}C + {sup 4}He. This allowed to establish the feasibility of implementing this technique in our Laboratory. The application of this and other techniques to different systems like {sup 18}O + {sup 4}He, {sup 12}C + {sup 12}C, {sup 12}C + {sup 16}O, {sup 16}O + {sup 16}O, it opens the possibility to measure the fusion of these systems at very low energy and to deepen in the knowledge of the nuclear structure and the nuclear astrophysics. In this technical report, the activities carried out by our group during the second stage of this project, considered for 2005 are described. Also in that year, our group carries out a research stay in the University of Notre Dame, during this stay, the angular distribution of the projectiles of {sup 8}B dispersed in an enriched target of {sup 58}Ni was measured. The same as in the previous experiments, in this occasion it was also possible to measure those angular distributions of the projectiles of {sup 7}Be and {sup 6}Li dispersed in this same target. In this same one our stay group participates in other three experiments proposed by collaborators of other institutions (University of Notre Dame, University of Sao Paulo), where the products of the reactions {sup 6}Li, {sup 7}Be and {sup 8}B in targets of aluminum, zinc and carbon were detected. During 2005 it was beginning the installation of the Time of Flight spectrometer, equipment that was donated by the University of Notre Dame to the Tandem Accelerator Laboratory of the ININ. (Author)

  17. Nuclear reactions with radioactive and stable beams (Part I); Reacciones nucleares con haces radiactivos y estables (Parte I)

    Energy Technology Data Exchange (ETDEWEB)

    Aguilera R, E.F.; Martinez Q, E.; Gomez C, A. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2004-12-15

    At the present time there is a great interest at world level in experiments, with accelerated nuclei of short half life. The dispersion, fusion, transfer and break processes in the interaction of weakly light projectiles bounded with targets of Z great its have been object of intense recent investigation, at world level. Our group, in collaboration with the University of Notre Dame, it has measured and analyzed these processes for weakly bound systems as: {sup 6}He + {sup 209}Bi, {sup 8}Li + {sup 208}Pb, {sup 10}Be + {sup 208}Pb. On the other hand a research line that has wakened up great interest, it is that of studies of resonant reactions using the Inverse Kinematics technique with thick targets. The use of this technique allows to measure an entire excitation function with a single bombardment. Our group has carried out, in the ININ, preliminary bombardments for the system {sup 12}C + {sup 4}He. This allowed to establish the feasibility of implementing this technique in our Laboratory. The application of this and other techniques to different systems like {sup 18}O + {sup 4}He, {sup 12}C + {sup 12}C, {sup 12}C + {sup 16}O, {sup 16}O + {sup 16}O, it opens the possibility to measure the fusion of these systems at very low energy and to deepen in the knowledge of the nuclear structure and the nuclear astrophysics. In this technical report, the activities carried out by our group during 2004 are described.(Author)

  18. Evaluación y selección de un protocolo vía Agrobacterium para la incorporación de resistencia al cogollero en la variedad de tomate Unapal-Arreboles Evaluation and selection of a protocol for Agrobacterium-mediated genetic transformation of tomato variety Unapal-Arreboles for resistance to budworm

    Directory of Open Access Journals (Sweden)

    Hernando Ramírez

    2009-04-01

    Full Text Available Se evaluó y seleccionó una metodología para la transformación genética de la variedad de tomate UNAPAL-Arreboles con el gen cry1Ab para la incorporación de resistencia al cogollero (Tuta absoluta, utilizando el sistema de Agrobacterium. Se regeneraron 59 plantas transgénicas a partir de 3.200 explantes (1.84%. La integración estable, expresión y herencia de los genes nptII y gus-intrón, se demostraron mediante análisis histoquímico y molecular en los clones To28, To33 y To47 y en la correspondiente generación T1. Sin embargo, los análisis molecular e inmunológico indicaron ausencia del gen cry1Ab sugiriendo que la secuencia de este gen se puede haber modificado.A plant transformation methodology was selected and evaluated to incorporate the cry1Ab gene by Agrobacterium-mediate genetic transformation into tomato variety UNAPAL-Arreboles for resistance to budworm (Tuta absoluta. A total of 59 transgenic plants were regenerated from 3.200 explants (1.84%. Histochemical gus assay and molecular analysis of three independent events To28, To33 and To47 and corresponding T1 derived generations, demonstrate the stable integration, expression and inheritance of the nptII and gus-intron genes. However, the molecular and immunological analysis of these same clones, indicate that the cry1Ab gene is not present in the transformed plants, suggesting that the sequence of this gene may be modified as result of possible recombinant events.

  19. 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...

  20. 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.

  1. 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)

  2. 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.)

  3. 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.

  4. 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...

  5. 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

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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

  11. 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

  12. 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, ...

  13. 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.

  14. 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...

  15. 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.

  16. 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...

  17. 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.

  18. 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 .

  19. 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.)

  20. 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.

  1. 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

  2. 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 ...

  3. 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.

  4. 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

  5. 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.

  6. 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

  7. 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).

  8. 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)

  9. 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.)

  10. 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...

  11. 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.

  12. 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.

  13. 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

  14. Estabilidad temporal de mepivacaína al 1.5% alcalinizada Alkalinized 1.5% mepivacaine stability over time

    Directory of Open Access Journals (Sweden)

    M. Gerónimo

    2008-10-01

    Full Text Available Objetivos: Estudiar la estabilidad en el tiempo de la mepivacaína alcalinizada en cuanto a valores de pH y formación de precipitados, ya que apenas existe información en la literatura acerca de la estabilidad temporal de este anestésico, y la información disponible aconseja alcalinizarla Justo antes de su empleo. Material y métodos: Fueron preparadas tres Jeringas (A, B y C de 20 mL conteniendo mepivacaína al 1.5%. La Jeringa A fue utilizada como control de pH, y las jeringas B y C fueron alcalinizadas adicionando 2 mL de bicarbonato al 8.4%. Fue medido el pH y calculado el porcentaje de base libre asociado en cada jeringa previamente a la alcalinización y posteriormente cada 10 minutos hasta completar una hora, salvo para la jeringa C en los últimos 30 minutos, que permaneció cerrada como control de fuga de CO2. Las soluciones fueron inspeccionadas visualmente durante todo el procedimiento para identificar eventuales precipitados macroscópicos y, tras la hora de estudio, fueron filtradas para indagar sobre la formación de precipitados microscópicos. Tras el filtrado, el pH de cada solución anestésica fue medido de nuevo. Resultados: Tras la alcalinización de la mepivacaína al 1.5% se produjo un aumento inmediato y significativo de los valores de pH y del porcentaje calculado de base libre en las jeringas alcalinizadas B y C con respecto a la de control A, y en todas las jeringas el pH permaneció muy estable durante una hora. Además, a los 60 minutos apenas existieron diferencias entre los valores de pH de las jeringas B y C, lo que indica que no se produjo fuga significativa de CO2. En este tiempo no hubo sospecha de formación de precipitados por inspección visual, y las mínimas diferencias encontradas entre los pesos secos de los filtros indican que no hubo formación de precipitados significativa. Conclusiones: Las soluciones de mepivacaína al 1.5% pueden ser alcalinizadas y permanecer a temperatura ambiente en jeringas

  15. 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.

  16. 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.

  17. 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

  18. 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.

  19. 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.

  20. 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

  1. 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...

  2. 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...

  3. 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.

  4. 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 ...

  5. 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...

  6. 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...

  7. 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...

  8. 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

  9. 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...

  10. 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.

  11. 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...

  12. 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

  13. 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)

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. 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

  20. 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

  1. 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....

  2. 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.

  3. 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.)

  4. 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.

  5. 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

  6. 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.

  7. 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.

  8. 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.

  9. Uso da terra e a qualidade microbiana de agregados de um Latossolo Vermelho-Amarelo

    OpenAIRE

    Rogério Melloni; Eliane Guimarães Pereira Melloni; Lucas Lopes Vieira

    2013-01-01

    A maioria dos estudos relacionados à agregação do solo associa o efeito de manejos ou tipos de uso da terra ao teor de matéria orgânica. No entanto, a avaliação de microrganismos e seus processos, feita diretamente em estruturas indeformadas do solo, permite maior entendimento do real efeito de diferentes tipos de manejos exercidos sobre esse. Assim, o objetivo deste trabalho foi avaliar modificações impostas por diferentes tipos de uso da terra (pastagem, mata de eucalipto, mata com araucári...

  10. Aderência do aço-concreto produzido com agregado reciclado

    OpenAIRE

    Márcio Joaquim Estefano de Oliveira; Cássia Silveira de Assis

    2006-01-01

    Civil construction works (including new constructions, demolitions and reforms) produce a considerable amount of construction and demolition waste that is generally discharged in inadequate way. The disposal of detritus without criterion expose the environment and the human being to unnecessary risks, once these wastes are often thrown into rivers, on the roadsides or agricultural grounds, and its contaminating substances, such as bitumen, solvent, calcium sulpha...

  11. Agregados monetarios, inflación y actividad económica en México

    OpenAIRE

    2003-01-01

    This paper analyzes the relationships of monetary aggregates with inflation and economic activity in Mexico from 1980 to 2000. The stability of the long-run and short-run demands for each aggregate is examined and the exogeneity properties of the variables involved are discussed. Among all the definitions of money, currency is the one that helps to forecast inflation and economic activity better although, even in this case, the usefulness of monetary aggregates for this purpose seems to be ra...

  12. 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

  13. 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.

  14. 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.

  15. 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...

  16. 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...

  17. 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...

  18. 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...

  19. 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...

  20. 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...