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Sample records for ondas viajeras son

  1. Ensinando sobre ondas transversais, ondas estacionárias e ondas polarizadas utilizando um simples motor a pilha

    OpenAIRE

    Neves,Ubaldo Martins das

    2013-01-01

    Apresentamos nesse artigo um aparato muito simples de ser construído e de custo quase zero que permite a produção de ondas estacionárias em uma corda. O aparato pode ser utilizado pelo professor para realizar demonstrações em sala de aula sobre os temas: ondas transversais, ondas estacionárias e polarização de ondas. O efeito da destruição de uma onda polarizada por meio de dois polarizadores cruzados também pode ser demonstrado.

  2. Ensinando sobre ondas transversais, ondas estacionárias e ondas polarizadas utilizando um simples motor a pilha

    OpenAIRE

    Neves, Ubaldo Martins das

    2013-01-01

    Apresentamos nesse artigo um aparato muito simples de ser construído e de custo quase zero que permite a produção de ondas estacionárias em uma corda. O aparato pode ser utilizado pelo professor para realizar demonstrações em sala de aula sobre os temas: ondas transversais, ondas estacionárias e polarização de ondas. O efeito da destruição de uma onda polarizada por meio de dois polarizadores cruzados também pode ser demonstrado. In this article we present a simple and low coast device to ...

  3. Procesamiento de ondas cerebrales con microprocesador ARM para control de coche teledirigido

    OpenAIRE

    Calderón Martínez, Daniel

    2016-01-01

    Este trabajo fin de grado trata sobre el procesamiento de las señales que produce el cerebro humano para utilizarlas y destinarlas a algún propósito. En este caso, dicho propósito es el control de un coche teledirigido de juguete. Mediante un dispositivo electrónico comercial, que realiza la función de BCI (Brain Computer Interface), se captan las ondas cerebrales haciendo uso de una electroencefalografía (EEG) y son enviadas a un microprocesador ARM vía bluetooth. El casco o sensor de ondas,...

  4. Modelo de propagación de ondas solitarias en el corazón

    Directory of Open Access Journals (Sweden)

    Ivonne Domínguez

    2013-01-01

    Full Text Available En la actividad eléctrica cardiaca, distintos tipos de onda viajan a través del corazón. Presentamos un modelo de la actividad eléctrica del corazón, proponemos que los frentes de onda homogéneos que se propagan en el corazón son, de hecho, ondas solitarias, o “solitones”. Usamos un conjunto general de ecuaciones de reacción-difusión conocido como el modelo de Barrio-Varea-Aragón- Maini (BVAM[1], el cual presenta una abundancia de bifurcaciones no lineales, siendo capaces de encontrar la ruta al caos usando un mapeo de las ecuaciones de amplitud a la dinámica de la ecuación compleja de Ginzburg-Landau. Estudiamos numéricamente la dinámica de los frentes de onda en el modelo BVAM para describir los mecanismos que conducen a la fibrilación en el corazón y comparamos los resultados con datos experimentales.

  5. Ondas estacionarias y aproximaciones

    OpenAIRE

    Navazo Esteban, Santiago

    2017-01-01

    RESUMEN: Las ondas estacionarias juegan un papel importante en la descripción de fenómenos relacionados con sistemas vibratorios y propagación de ondas. En este trabajo se hace una recopilación de algunas ondas estacionarias que se calculan explícitamente. Dichos cálculos permiten en ocasiones localizar ciertas vibraciones en problemas dependientes de pequeños parámetros. Esto se pone de manifiesto en un problema "stiff". ABSTRACT: Stationary waves play an important role in the description...

  6. Tema 2. Oscilaciones y ondas (Curso 2010-2011)

    OpenAIRE

    Caballero Caballero, María Teresa; Espinosa Tomás, Julián; Pérez Rodríguez, Jorge; Miret Marí, Juan José

    2010-01-01

    1. Oscilaciones: movimiento armónico simple. Oscilaciones amortiguadas y forzadas. Resonancia; 2. Ondas armónicas: función y ecuación de ondas; 3. Sonido: ondas sonoras, velocidad de propagación; 4. Intensidad de las ondas. Fenómenos de propagación: reflexión, refracción y difracción; 5. Interferencias. Ondas estacionarias.

  7. Ondas gravitacionales de choque

    OpenAIRE

    Ranea Sandoval, Ignacio Francisco

    2010-01-01

    En este trabajo monográfico se presenta un breve resumen relacionado con las ondas gravitacionales y con la teoría general de la relatividad. Realizado esto se presenta una adaptación de trabajos científicos asociados con un fenómeno conocido como ondas gravitacionales de choque. Trabajo final de Introducción a la Astrofísica de Agujeros Negros. Facultad de Ciencias Astronómicas y Geofísicas

  8. Ondas T negativas gigantes de origen indeterminado

    Directory of Open Access Journals (Sweden)

    Eduardo Eyheremendy

    2009-01-01

    Full Text Available Se define onda T negativa gigante o inversión masiva de la onda T a la aparición de ondas T negativas con una amplitud = 1 mV en por lo menos dos derivaciones contiguas del ECG. Se presenta el caso de una paciente de 66 años con antecedentes de dislipidemia tipo IV e hipertensión arterial leve, a la que en buen estado de salud y totalmente asintomática en un examen de rutina se le detecta en el ECG de superficie un hemibloqueo anterior y ondas T negativas gigantes en las derivaciones I, II, aVL, aVF y de V1 a V6. La paciente fue internada en la UCI, donde se descartó que fueran de origen coronario. Durante el seguimiento, las ondas T se tornaron menos negativas hasta que al cabo de un tiempo (45 días aproximadamente se normalizaron. A pesar de los estudios cardiológicos y no cardiológicos realizados, no se pudo establecer su origen.REV ARGENT CARDIOL 2009;77:131-134.

  9. Los agujeros negros y las ondas del Doctor Einstein

    OpenAIRE

    Mario Alberto Rodríguez-Meza

    2017-01-01

    Se describen los principales desarrollos científicos que llevaron a la detección de las ondas gravitacionales por el proyecto ligo: la relatividad general, sus predicciones de agujeros negros y ondas gravitacionales, la relatividad numérica y las simulaciones de la colisión y coalescencia de dos agujeros negros y los desarrollos de diversos detectores de ondas gravitacionales. Finalmente la detección de las ondas gravitacionales confirma la existencia de los enigmáticos agujeros negros.

  10. Los agujeros negros y las ondas del Doctor Einstein

    Directory of Open Access Journals (Sweden)

    Mario Alberto Rodríguez-Meza

    2017-01-01

    Full Text Available Se describen los principales desarrollos científicos que llevaron a la detección de las ondas gravitacionales por el proyecto ligo: la relatividad general, sus predicciones de agujeros negros y ondas gravitacionales, la relatividad numérica y las simulaciones de la colisión y coalescencia de dos agujeros negros y los desarrollos de diversos detectores de ondas gravitacionales. Finalmente la detección de las ondas gravitacionales confirma la existencia de los enigmáticos agujeros negros.

  11. Demo 8. Ondas transversales con un muelle gigante

    OpenAIRE

    Ferrer Roca, Chantal; Zúñiga Román, Juan

    2013-01-01

    Objetivos. A. Diferencia entre pulso y onda sinusoidal. Velocidad de propagación de un pulso en función de la tensión. B. Interferencia de pulsos (constructiva y destructiva) C. ondas estacionarias (modos de una cuerda) con posibilidades de medida cuantitativa de la velocidad de propagación. Distintas longitudes y tensiones.

  12. Detecção óptica de onda de Lamb

    OpenAIRE

    Rodrigo Andrade Cavalcanti Araujo

    1996-01-01

    Esta tese apresenta a análise teórica e experimental da detecção de onda de Lamb em sólido isotrópico, através da utilização de um interferômetro óptico tipo Mach-Zehnder heterodino. Foi desenvolvida uma formulação para analisar a interação acusto-óptica superficial que utiliza a onda de Lamb, levando-se em consideração ambas as componentes de deslocamento acústico geradas pela onda de Lamb. Os resultados dessa análise revelaram que, ao contrário do que é regularmente divulgado na literatura,...

  13. Las ondas en las universidades o las universidades en las ondas

    Directory of Open Access Journals (Sweden)

    Verónica Marín Díaz

    2014-01-01

    Full Text Available En las aulas y pasillos de las universidades vuelven a sonar las ondas hercianas que raen una variedad de programas a la anodina vida de la comunidad universitaria, inmersa en la implantación de títulos de Grado, nuevos programas de doctorado, legislación universitaria variable y un largo etcétera que afecta al devenir de la vida en el ámbito de la educación superior.

  14. DECAIMIENTOS PARAMETRICOS DE ONDAS ELECTROMAGNETICAS EN PLASMAS DE ELECTRONES Y POSITRONES.

    OpenAIRE

    MUÑOZ GALVEZ, VICTOR HUGO; MUÑOZ GALVEZ, VICTOR HUGO

    1998-01-01

    En esta tesis se estudian los decaimientos paramétricos de ondas electromagnéticas en plasmas de electrones y positrones. Se considera, primero, la propagación de ondas planas electromagnéticas polarizadas lineal y circularmente en un plasma no magnetizad 107p.

  15. Velocidad de onda y módulos de elasticidad por ultrasonido y ondas de esfuerzo de vigas de madera de Pinus spp. mexicana

    Directory of Open Access Journals (Sweden)

    Javier Sotomayor

    2015-04-01

    Full Text Available La industria de edificación con madera requiere datos de resistencia mecánica de madera con dimensiones y clasificación apropiadas para su uso como elementos estructurales. La presente investigación propone una estrategia experimental para la caracterización mecánica de vigas de madera y su aplicación como material de Ingeniería. El objetivo de la investigación fue: determinar las velocidades de onda y los módulos de elasticidad de vigas de Pinus spp., empleando ultrasonido y ondas de esfuerzo estudiando 70 vigas de Pinus spp. con dimensiones de 0.10 m x 0.15 m de sección transversal, 35 vigas de 5 m y 35 de 6 m de longitud. Las velocidades de transmisión presentaron coeficientes de variación coherentes a la heterogeneidad estructural de la madera. Los valores de estos coeficientes se incrementaron cuando se calcularon características de segundo nivel, como es el caso de los módulos de elasticidad. La velocidad y el módulo de elasticidad mostraron un carácter de anisotropía importante para el cálculo de la resistencia mecánica de las vigas. Igualmente, los parámetros calculados con el método de ondas de esfuerzo resultaron mayores a los determinados con ultrasonido. Los resultados permiten concluir que las técnicas de ultrasonido y ondas de esfuerzo pueden determinar la velocidad de onda y los módulos de elasticidad de vigas de madera de Pinus spp.

  16. Resposta superovulatória na primeira onda de crescimento folicular em doadoras Nelore (Bos indicus)

    OpenAIRE

    Luiz Fernando Tonissi Nasser

    2006-01-01

    Três experimentos foram realizados para testar a hipótese de que a resposta superestimulatória de doadoras Nelore (Bos indicus) com tratamentos iniciados próximo à ovulação durante a primeira onda de crescimento folicular seria maior ou comparável àquela decorrente de tratamentos convencionais. Os animais foram aleatoriamente alocados em três grupos. As doadoras dos Grupos 1 - Onda 1 s/P4 e 2 - Onda 1 c/P4 foram superestimuladas na primeira onda de crescimento folicular, e as do Grupo 3 - Sin...

  17. ¿Qué es una onda ecuatorial de Kelvin?

    OpenAIRE

    Ripa, P.

    1980-01-01

    La importancia del estudio de las ondas de Kelvin (ecuatoriales o costeras) radica, en parte, en el hecho de que éstas proveen un mecanismo eficaz para el transporte de energía (en la forma de perturbaciones de densidad y corriente) en una dirección particular. Estas señales se trasladan sin dispersión, es decir, sin cambiar de forma. Por otra parte, una onda de Kelvin provee un ejemplo muy sencillo de dos fenómenos fundamentales de la Oceanografía Física de frecuencias: el balance geostrófic...

  18. Impacto de ondas sobre taludes

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    Yamile Valencia

    2003-01-01

    Full Text Available Las playas sufren cambios topobatimétricos por la acción del viento, corrientes, hidrodinámica del oleaje e inestabilidad de taludes. En este artículo se estudia un modelo, en donde es posible analizar la solución teórica tipo Airy del movimiento ondulatorio, para tipificar una onda que se produce por medio de un generador de oleaje, diseñado para operar en un canal metálico de determinadas dimensiones. En un extremo del canal fue construido un talud con y sin protecciones, de geometría inicial dada y con diversos materiales (arena gruesa, media, fina y limo-arenoso, el cual fue sometido a la acción de diferentes ondas y a un seguimiento en el tiempo, hasta llegar al perfil de equilibrio. Además, se estudió el proceso erosivo cuya principal característica es la socavación de la parte superior del talud y la depositación en la pata, así como la formación de un punto neutro o de “Cornaglia”.

  19. Dispersión de la onda P dependiente de la velocidad de la onda A del flujo de entrada mitral y de la presión arterial sistólica

    Directory of Open Access Journals (Sweden)

    Elibet Chávez, MD., MSc

    2011-01-01

    Conclusiones: existe una dependencia de la dispersión de la onda P del electrocardiograma de variables tales como presión arterial sistólica y velocidad de la onda A del flujo sanguíneo de entrada mitral, hecho que ha sido relacionado con riesgo de fibrilación auricular en el adulto.

  20. EFECTO DE LAS FORMAS DE ONDAS DE CORRIENTE PULSANTE EN LA ELECTRODEPOSITACIÓN DE NANOCRISTALES

    OpenAIRE

    MOLINA, JAROL; HOYOS, BIBIAN

    2009-01-01

    Se desarrolló un modelo matemático para establecer el efecto que tiene la forma de las ondas de corriente pulsante en el tamaño y dureza de nanocristales electrodepositados. El modelo relaciona de forma directa las variables típicas de las ondas (frecuencia, ciclo de trabajo y corriente pico) con la dureza de los depósitos generados mediante corriente continua y con cuatro tipos de ondas de corriente pulsante: rectangular, rampa ascendente, rampa descendente y triangular. Se evaluaron los res...

  1. Novas tecnologias no estudo de ondas sonoras

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    Marisa Almeida Cavalcante

    2013-10-01

    Full Text Available http://dx.doi.org/10.5007/2175-7941.2013v30n3p579 O presente trabalho propõe a construção de um Tubo de Kundt adaptado às novas tecnologias disponíveis para o ensino de física. Tem como principal objetivo utilizar a placa Arduino em experimentos didáticos envolvendo o estudo de ondas sonoras. O Arduino é uma placa de controle I/O baseada no micro-controlador Atmega (Atmel e foi projetado inicialmente para fins didáticos. O fato da linguagem de programação utilizada e hardware serem do tipo open source (código aberto possibilitou sua ampla difusão em diversas áreas. Uma das intenções deste projeto é difundir o uso deste recurso para fins educacionais e particularmente no estudo de ondas sonoras estacionarias em tubos, contribuindo com a melhora na abordagem deste conteúdo no ensino e aprendizagem de Física.

  2. Rebentação das ondas e o transporte de sedimentos. O projecto BRISA

    OpenAIRE

    Fortes, C. J. E. M.; Ferreira, Ó.; Silva, P. A.; Neves, D. R.; Rocha, M.; Santos, J. A.; Pinheiro, L.; Didier, E.; Endres, L.; Bezerra, M.; Abreu, T.; Zózimo, A. C.; Sancho, F. E.; Moura, T.; Okamoto, T.

    2011-01-01

    Nesta comunicação descreve-se o projecto BRISA (Interacção entre a rebentação das ondas e o transporte de sedimentos) que tem como objectivo contribuir para a compreensão e modelação numérica dos fenómenos de rebentação das ondas e do transporte de sedimentos em zonas costeiras. Para este efeito, o projecto envolve a modelação numérica e experimental e a recolha de dados de campo relativos à hidrodinâmica da rebentação das ondas e ao transporte de sedimentos. Neste trabalho ...

  3. Refração-difração de ondas

    OpenAIRE

    Romeu, Marco Antônio Rígola

    2000-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. A inclusão de ilhas em modelos numéricos de propagação de onda baseados na aproximação parabólica da Equação de Declive Suave é um assunto de grande importância para a costa brasileira. Normalmente as ilhas são representadas por uma fina película de água que implica na arrebentação das ondas. Porém, ilhas com declives laterais íngremes violam a hipóteses do Declive Suave provocando o aparecimento de ruído...

  4. Efecto de las formas de ondas de corriente pulsante en la electrodepositación de nanocristales

    OpenAIRE

    MOLINA, JAROL; HOYOS, BIBIAN

    2009-01-01

    Se desarrolló un modelo matemático para establecer el efecto que tiene la forma de las ondas de corriente pulsante en el tamaño y dureza de nanocristales electrodepositados. El modelo relaciona de forma directa las variables típicas de las ondas (frecuencia, ciclo de trabajo y corriente pico) con la dureza de los depósitos generados mediante corriente continua y con cuatro tipos de ondas de corriente pulsante: rectangular, rampa ascendente, rampa descendente y triangular. Se evaluaron los res...

  5. Mobilidade sedimentar da plataforma continental do Estado de São Paulo em função da propagação de ondas

    OpenAIRE

    Carlos Koji Yokoyama

    2013-01-01

    O presente trabalho visa avaliar a mobilidade de sedimentos na plataforma continental do Estado de São Paulo levando em conta a propagação de ondas e o tipo de sedimento. Com base no clima de ondas da região, resultante do modelo global de ondas WAVEWATCH-III, o modelo MIKE-21 (SW) foi aplicado para avaliar os processos de transformação de ondas a medida em que elas avançam sobre a plataforma continental. As ondas predominantes são as de sul com 36% e leste com 34%, variando de 1 a 2,5 metros...

  6. Correlación entre ondas de ensayo para dispositivos supresores de sobretensiones Correlation factor between standard surge waves for testing transient overvoltage suppressor devices

    Directory of Open Access Journals (Sweden)

    Julio Guillermo Zola

    2008-06-01

    Full Text Available Existe un variado número de ondas impulsivas estándar que se utilizan para ensayar el funcionamiento de los dispositivos supresores de sobretensiones transitorias. En particular, resultan de importancia los ensayos que comprueban la corriente máxima de impulso de descarga. Se analiza en este trabajo la relación existente entre estas distintas formas de ondas impulsivas, de forma tal de poder obtener una correlación entre ellas para aplicar una u otra con similares resultados. Las conclusiones que se alcanzan a partir de un desarrollo teórico simplificado son corroboradas mediante medición en laboratorio y simulación.A wide number of standard surge waves current for testing the behavior of transient overvoltage suppressor devices are currently being used. The value of pick surge current is one of the most important tests. The ratio between the surge waves to obtain a correlation factor between them, so they can be applied to get equivalent results is analyzed in this paper. The theoretical conclusions are verified by simulation and laboratory measurements.

  7. Geração de energia a partir das ondas do mar

    OpenAIRE

    Grilo, Diogo Dinis

    2013-01-01

    Dado o aumento do consumo de energia e a necessidade de reduzir as emissões de poluentes para a atmosfera, o presente trabalho visa propor uma solução de produção de energia limpa a partir das ondas do mar. O objetivo desta dissertação é criar um sistema alternativo de conversão da energia cinética proveniente das ondas do mar em energia elétrica, tendo como ponto de partida o projeto do sistema pendular SEAREV. Numa primeira fase foi realizada uma análise dos sistemas de co...

  8. Ondas estocásticas de super-horizonte e o raio do universo

    OpenAIRE

    Luis Gustavo Tomaz Silva

    2013-01-01

    O efeito Grishchuk-Zel'dovich (GZ) é um mecanismo através do qual uma onda com comprimento maior que o raio de Hubble produz um quadrupolo nas flutuações de temperatura da Radiação Cósmica de Fundo (RCF). Uma vez que este quadrupolo não é integralmente observado, o quadrupolo efetivo extraído dos mapas de temperatura da RCF é utilizado para colocar um limite inferior no comprimento dessa onda e, consequentemente, no raio da região homogênea que contém o universo observável. Neste trabalho mos...

  9. Control de generación de la onda de choque y medición de sus tiempos característicos

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    Francisco Román Campos

    1985-01-01

    Full Text Available La generación y medición de las ondas de choque, que simulan las sobretensiones de corta duración debidas básicamente a descargas atmosféricas, son fundamentales para comprobar experimentalmente el cumplimiento de los requisitos de control de calidad que exigen las normas de fabricación del equipo eléctrico. En el presente articulo, se tratan estos dos aspectos -generación y medida- mediante el desarrollo de un generador de pulsos para sincronizar el osciloscopio con la producción de la onda de choque y la construcción de un sistema de medida consistente en un divisor resistivo, impedancias de acople y la cabina apantallada para aislar el osciloscopio de las interferencias electromagnéticas./1/. Las construcciones se realizaron en los laboratorios de metalurgia y mecánica del IEI (Instituto de Ensayos e Investigaciones y en los laboratorios de física de la Universidad Nacional, siendo los primeros desarrollos en el campo de mediciones de alta tensión que adelanta el grupo de investigación en alta tensión GIAT del Departamento de Ingeniería Eléctrica de la Universidad Nacional.

  10. Differential field equations for the MHD waves and wave equation of Alfven; Las ecuaciones diferenciales de campo para las ondas MHD y la ecuacion de onda de Alfven

    Energy Technology Data Exchange (ETDEWEB)

    Fierros Palacios, Angel [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-02-01

    In this work the complete set of differential field equations which describes the dynamic state of a continuos conducting media which flow in presence of a perturbed magnetic field is obtained. Then, the thermic equation of state, the wave equation and the conservation law of energy for the Alfven MHD waves are obtained. [Spanish] Es este trabajo se obtiene el conjunto completo de ecuaciones diferenciales de campo que describen el estado dinamico de un medio continuo conductor que se mueve en presencia de un campo magnetico externo perturbado. Asi, se obtiene la ecuacion termica de estado, la ecuacion de onda y la ley de la conservacion de la energia para las ondas de Alfven de la MHD.

  11. Visualizando ondas eletromagnéticas estacionárias (um experimento na cozinha de casa)

    OpenAIRE

    Laburú, Carlos Eduardo; UEL - Párana; Ota, Maria Inês Nobre; UEL - Paraná; Basso, Rodrigo Leonardo de Oliveira; UEL - Paraná; Almeida, Chrystie Jacob; UEL - Paraná

    2004-01-01

    Inserido numa proposta para o ensino médio de Física, aplicado à tecnologia contemporânea, este trabalho propõe um experimento caseiro para visualizar ondas eletromagnéticas estacionárias que se formam no interior da cavidade de um forno microondas. A idéia central é partir da motivação inicial dada por este experimento, quando se está estudando, por exemplo, o tópico ondas , na disciplina de Física, a fim de compreender-se o funcionamento deste eletrodoméstico caseiro qu...

  12. Inversión espectral prestack simultánea de ondas PP y PS para la caracterización cuantitativa de capas delgadas

    Directory of Open Access Journals (Sweden)

    Ramsis Guerrero

    2012-06-01

    Full Text Available En este trabajo extendemos un método de inversión espectral para determinar las propiedades de una capa delgada y de los medios que se encuentran por encima y por debajo de la misma, a partir del espectro de amplitud de la respuesta sísmica prestack, con aplicación a la caracterización de reservorios asociados a estructuras con espesores por debajo del tunning. Estas propiedades incluyen el espesor de la capa delgada como así también las velocidades de las ondas compresionales y de corte, y las densidades de cada uno de los tres medios. Se presentan numerosos ejemplos utilizando datos sintéticos con ruido gaussiano generados a partir de diversos modelos de capas delgadas representativos de reservorios de gas de unos pocos metros de espesor. Se demuestra que, bajo ciertas condiciones, es posible obtener estimaciones razonables de los diversos parámetros involucrados utilizando el dato sísmico prestack convencional (ondas PP. Se analiza asimismo el impacto del uso de la información adicional provista por las ondas de corte convertidas (ondas PS, demostrándose que éstas contribuyen a mejorar significativamente las calidad de los resultados y a relajar las condiciones requeridas por el uso de las ondas PP solamente. Por último, y con el objetivo de reducir los problemas de no-unicidad inherentes a este tipo de problema inverso, las soluciones son forzadas a satisfacer, dentro de cierta tolerancia, la posible correlación existente entre las velocidades de las ondas P y S, y entre la velocidad de la onda P y la densidad, información a priori con frecuencia disponible a partir de datos de pozo. Como consecuencia, la incerteza en la estimación del espesor, velocidades y densidad de la capa delgada se reduce significativamente, lo que permite obtener soluciones más precisas y confiables.In this work, we extend a spectral inversion method for determining the properties of a thin bed and those of the media lying above and below it from

  13. Propiedades de las ondas atmosféricas de gravedad deducidas de la emisión en 557,7 nm

    OpenAIRE

    Molina Cuevas, Antonio

    2013-01-01

    La raya verde de la luminiscencia atmosférica se utiliza para la determinación de las ondas de gravedad en la zona 90-100 km y de forma especial la capacidad de mezcla de los compuestos debido a las ondas de gravedad

  14. Índice para la evaluación de las reflexiones mediante análisis de la onda de pulso radial

    Directory of Open Access Journals (Sweden)

    Gustavo J. Meschino

    2008-01-01

    Full Text Available En el presente trabajo se analiza la posibilidad de utilizar un parámetro obtenido del registro de la onda de pulso radial, el ancho de la onda sistólica, que es más sencillo de medir aún que el índice de aumentación radial y que complementaría a este último en la evaluación de la amplitud de la reflexión sistólica, directamente relacionada con el grado de disfunción endotelial y el fenómeno de aumentación aórtica.Se efectuó un estudio poblacional sobre 120 varones normotensos sanos con edades entre 17 y 65 años. Se obtuvo en ellos el registro de la onda de pulso radial en base al registro del movimiento de las paredes de la arteria mediante un sensor capacitivo aplicado sobre la zona de palpación del pulso. Cada registro se procesó y normalizó en amplitud y se calculó el índice de aumentación radial y el ancho de la onda sistólica al 50% de su altura máxima.Se halló que individuos con el mismo índice de aumentación poseían distintos valores de ancho de onda sistólica, lo cual evidencia distintos valores de amplitud de la onda reflejada. Ambos parámetros aumentaron con la edad y su correlación r resultó de 0,9.Se propone la utilización del ancho de la onda sistólica como un índice de envejecimiento alternativo, que permitiría evaluar el sistema arterial cuando la medición del índice de aumentación resultara dificultosa o la comparación entre individuos fuera ambigua.

  15. Tema 10. Ondas electromagnéticas (Enunciados de los problemas)

    OpenAIRE

    Beléndez Vázquez, Augusto

    1999-01-01

    Enunciados de los problemas del Tema 10: "Ondas electromagnéticas" que se imparte en la asignatura "Fundamentos Físicos de la Ingeniería" de primer curso de la titulación de Ingeniero Técnico de Telecomunicación, especialidad Sonido e Imagen, de la Universidad de Alicante.

  16. Sinterização por micro-ondas de ferrita de níquel sintetizada pelo método Pechini

    Directory of Open Access Journals (Sweden)

    J. R. Muñoz Hoyos

    2013-09-01

    Full Text Available A sinterização por micro-ondas é uma técnica que oferece enorme potencial para a fabricação de diversos materiais cerâmicos com microestruturas cerâmicas diferenciadas. Este trabalho teve por objetivo sinterizar cerâmicas de ferrita de níquel (NiFe2O4 em forno de micro-ondas, visando controle de crescimento de grão e alta densificação. Para realizar esta investigação, foi utilizado o processo de síntese por Pechini para a preparação do pó das ferritas de níquel. Amostras desse material foram sinterizadas em forno convencional e de micro-ondas. A caracterização foi feita por difração de raios X, microscopia eletrônica de varredura, determinação de densidade aparente e obtenção das curvas de histerese magnética. A sinterização da ferrita de níquel por micro-ondas levou apenas 10% do tempo gasto da sinterização convencional. As amostras apresentaram menor tamanho de grão, e densidade e magnetização de saturação semelhantes às obtidas pela sinterização convencional, mostrando o alto potencial de aplicação da técnica de micro-ondas para o processamento desses materiais.

  17. Frentes de ondas (wavefronts e limites da visão humana Parte 1: fundamentos

    Directory of Open Access Journals (Sweden)

    Jankov Mirko

    2002-01-01

    Full Text Available A luz se propaga uniformemente a partir de um ponto luminoso na mesma velocidade em todas as direções. Sua posição em cada determinado momento é uma esfera formada juntando-se todos os pontos em uma mesma fase e tendo como centro a sua própria fonte. Tais superfícies esféricas imaginárias chamam-se frentes de luz ou frentes de ondas. Há três fatores limitadores de detalhes mais finos para o olho humano: óptico (por causa da dispersão, difração, aberração cromática e aberração monocrom��tica, retínico e neural (limitação máxima de acuidade visual de aproximadamente 2,0 ou 20/10.Um sistema de equações matemáticas, polinômios de Zernike, pode definir superfícies geométricas para descrever aberrações ópticas monocromáticas, tanto as de baixa ordem ('prisma', 'esfera' e 'astigmatismo', quanto às de alta ordem ('coma', 'aberração esférica' e outros. Medida das aberrações ópticas nos dá informação sobre o desempenho total de todos os elementos ópticos do olho em conjunto. Dois sistemas descritos aqui, o aberrômetro baseado no princípio de Tscherning e o originado do sensor Hartmann-Shack, têm a mesma lógica: comparar a posição atual das frentes de onda com a ideal, calcular matematicamente qual é a superfície geométrica que descreve essa discrepância e representá-la em termos de polinômios de Zernike. A topografia corneana computadorizada também pode, com "software" adequado, descrever as frentes de ondas definidas por irregularidades corneanas com polinômios de Zernike, porém tal caracterização representa somente a superfície anterior da córnea. Em conclusão, a tecnologia de frentes de ondas oferece nova maneira de quantificar e classificar os erros de imagem óptica do olho humano. O próximo artigo abordará as peculiaridades da análise de frentes de ondas, bem como algumas aplicações clínicas e cirúrgicas no dia-a-dia da prática oftalmológica.

  18. FUNDAMENTOS CONCEPTUALES DE UNA TEORÍA DE INTERFERENCIA UNIFICADA PARA ONDAS Y PARTÍCULAS

    Directory of Open Access Journals (Sweden)

    Román Castañeda

    2016-01-01

    Full Text Available La interferencia de la luz y de la materia se aborda de manera muy distinta, a pesar de que sea producida por arreglos experimentales con la misma configuración a escala diferente, que entregan resultados de morfología similar, llamados patrones de interferencia. El aparato matemático empleado para la predicción de los patrones de interferencia es similar y se basa en la superposición de funciones de onda. No obstante, mientras que en el caso de la luz la superposición de ondas es un principio fenomenológico que conduce a explicaciones físicas, en el caso de la materia, las funciones de onda no tienen significado físico, por lo que su superposición no conduce a explicaciones fenomenológicas. Así, fenómenos físicos análogos no se explican con base en causas naturales comunes y necesarias, como lo establecen las dos reglas de filosofía natural de Newton vigentes para el análisis de resultados experimentales. En este trabajo se proponen fundamentos conceptuales para una teoría basada en un nuevo principio físico de interferencia, tanto para luz como para la materia, que supera tales limitaciones y se ajusta a las reglas filosóficas de Newton.

  19. EFECTO DE LAS FORMAS DE ONDAS DE CORRIENTE PULSANTE EN LA ELECTRODEPOSITACIÓN DE NANOCRISTALES

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    JAROL MOLINA

    2009-01-01

    80%, con frecuencias de 50 y 150 Hz y corrientes pico de 4 y 8 kA/m2. El modelo predice que pequeños aumentos en el sobrepotencial de concentración incrementan significativamente la velocidad de nucleación, disminuyen el crecimiento de los nanocristales y generan un aumento en la dureza. El aumento del ciclo de trabajo y la frecuencia de las ondas produce un comportamiento cada vez más cercano al producido por la corriente continua, con una disminución en la dureza de los nanocristales. Cualquier modificación en las variables de las ondas, que tenga como consecuencia el incremento de la corriente pico, produce valores de dureza más altos.

  20. Selección y Espaciamiento de Apartarrayos en Líneas de Distribución de 23 kV de la Zona Centro

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    L. Cisneros-Villalobos

    2015-01-01

    Full Text Available En este artículo se analiza una red de distribución urbana de 23 kV típica de la zona central de México. El objetivo es determinar la distancia máxima de separación entre apartarrayos de línea que permita reducir las salidas de los circuitos de distribución por descargas atmosféricas directas e indirectas. Con base en las características eléctricas, ambientales, ceráunicas y geográficas de la zona, niveles de cortocircuito y las sobretensiones provocadas por maniobras rutinarias, se selecciona el apartarrayos siempre con el principal objetivo de determinar su espaciamiento adecuado sobre la línea para que éste funcione apropiadamente. La investigación se lleva a cabo con la ayuda del software llamado Alternative Transients Program (ATP donde se realiza el cálculo de los parámetros de la línea utilizando el modelo de K.C. Lee, las sobretensiones transitorias por onda viajera y por conexión de capacitores también son simuladas. La motivación de este trabajo consiste principalmente en contar con un mayor sustento teórico y técnico (actualmente escueto para determinar el espaciamiento entre apartarrayos de la red de distribución considerada y así aumentar la calidad del suministro eléctrico de la zona.

  1. Excitaciones de corta longitud de onda en medios moleculares desordenados

    OpenAIRE

    Martín Marero, David

    2011-01-01

    En el presente trabajo se realiza un estudio de las excitaciones colectivas de longitud de onda comparables al espaciado intermolecular y que tienen lugar en tres sistemas con potenciales intermoleculares distintos: un vidrio molecular (metanol deuterado), un liquido polar (dioxido de azufre) y un liquido con aspectos cuánticos (deuterio). El estudio se ha realizado mediante espectroscopia neutrónica. En el caso del metanol se han encontrado excitaciones de carácter armónico de alta frecuenci...

  2. Desarrollo de software para el cálculo de coberturas de Ondas Medias

    Directory of Open Access Journals (Sweden)

    Bernardo Romero González

    2010-11-01

    Full Text Available Normal 0 21 false false false MicrosoftInternetExplorer4 st1:*{behavior:url(#ieooui } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} El presente trabajo trata sobre el estudio de las coberturas de la radiodifusión por amplitud modulada. Específicamente, se realiza el desarrollo de una herramienta para el cálculo de coberturas de estaciones de ondas medias. El documento expone los procedimientos para obtener 240 ecuaciones que caracterizan las curvas de propagación por onda de superficie y 6 ecuaciones para determinar intensidad de campo característico de monopolos verticales a través de la herramienta matemática “MATLAB 7.0”, la digitalización del mapa de conductividad eléctrica de Cuba a través del software para el análisis geográfico de datos “MapInfo”. Obteniéndose como producto final, el software “RadioTools”, herramienta para el cálculo de coberturas de estaciones de Ondas Medias. El software registrado en el Centro Nacional de Derecho de Autor (CENDA, con Registro 2100-2007, implementa a través del método de Kirke, y con las ecuaciones y el mapa obtenido, los procedimientos de cálculos necesarios para obtener directamente los mapas de cobertura.

  3. Índices de onda P na predição de recorrência de fibrilação atrial após isolamento da veia pulmonar

    Directory of Open Access Journals (Sweden)

    Ahmed Salah

    2013-12-01

    Full Text Available FUNDAMENTO: Índices de ondas P são marcadores interessantes para prever recorrências de fibrilação atrial (FA pós ablação. OBJETIVO: Esse estudo avalia o valor dos índices de onda P para prever recorrências após isolamento da veia pulmonar (IVP em pacientes com fibrilação atrial paroxística. MÉTODOS: Foram selecionados 198 pacientes (57 ± 8 anos, 150 homens com FA paroxística sintomática refratária a medicamentos submetidos ao IVP em nosso hospital. Um eletrocardiograma de 12 derivações foi utilizado para medir a duração da onda P na derivação II, a força terminal de P (FTP na derivação V1, o eixo e a dispersão da onda P. RESULTADOS: No acompanhamento de 9 ± 3 meses, as recorrências ocorreram em 60 (30,3% pacientes. Os pacientes que apresentaram recorrência de FA tiveram maior duração média de onda P (122,9 ± 10,3 versus 104,3 ± 14,2 ms, p 125 ms apresenta 60% de sensibilidade, especificidade de 90%, valor preditivo positivo (VPP de 72% e valor preditivo negativo (VPN de 83,7%, enquanto a dispersão da onda P > 40 ms tem 78% de sensibilidade, 67% de especificidade, PPV 51% e VPN de 87,6%. 48/66 (72,7% dos pacientes com FTP -0,04 mm/segundo tiveram recorrência de FA (p 125 ms, a dispersão da onda P > 40 ms e FTP em V1 < -0,04 mm/sec são bons preditores clínicos das recorrências de FA pós IVP em pacientes com fibrilação atrial paroxística; contudo, eles não foram independentes do tamanho do átrio esquerdo e da idade.

  4. Estimación de la velocidad de propagación aórtica basada en el análisis de la onda de pulso radial

    Directory of Open Access Journals (Sweden)

    Fernando Clara

    2011-06-01

    Full Text Available Se exploró la posibilidad de utilizar la morfología del registro de onda de pulso radial obtenida mediante un transductor de movimiento para evaluar la velocidad de propagación aórtica. Se efectuó el registro de onda de pulso en arteria radial mediante un transductor apoyado sobre la zona de palpación del pulso, sobre un conjunto de 167 voluntarios varones sanos normotensos de edades comprendidas entre la 2ª y la 7ª década. Se identificó en los registros la onda reflejada y se definió un coeficiente de velocidad como el cociente entre la talla del individuo y el tiempo transcurrido entre el máximo de la onda sistólica y el instante de llegada de dicha onda. Se halló que en los normotensos el coeficiente mencionado aumentó en forma lineal con la edad, en una proporción similar al aumento de velocidad de propagación aórtica medido con otros métodos. Se repitió el procedimiento en otro conjunto de 125 varones hipertensos sin otros factores de riesgo, de edades entre la 3ª y la 7ª década, hallándose valores similares a los normotensos solamente en la 3ª década, a partir de la cual se registró un incremento significativo de dicho índice. Tales hallazgos sustentan la factibilidad de utilizar tal tipo de registros para evaluar indirectamente la velocidad de propagación junto con el índice de aumentación, un parámetro habitualmente utilizado en el análisis de onda de pulso.

  5. Incremento en la dispersión de la onda P al disminuir el tiempo de eyección auricular en hipertensos y prehipertensos

    Directory of Open Access Journals (Sweden)

    Elibet Chávez, MD., MSc

    2011-07-01

    Conclusiones: Se evidencia dependencia de la dispersión de la onda P, del electrocardiograma y de la duración de la onda A del flujo de entrada mitral, hechos que se relacionan con riesgo de fibrilación auricular en el adulto, por lo que quizás este resultado dé un acercamiento a predicciones de riesgo más tempranas en edades pediátricas.

  6. MODELAMIENTO DE UN ALGORITMO PARA LA ASIGNACION DE LONGITUDES DE ONDA EN UN MULTIPLEXOR DWDM MINIMIZANDO EL PROCESO DE MEZCLADO DE LA CUARTA ONDA FWM (FOUR WAVE MIXING

    Directory of Open Access Journals (Sweden)

    Jorge Arturo Mojica Cáceres

    2013-07-01

    Full Text Available Uno de los medios de transmisión de alta velocidad más utilizados en nuestro entorno es la fibra óptica especificada en el estándar ITU-T G.625; sin embargo, su despliegue y utilización plantea en la actualidad varios desafíos a resolver debido a su característica de no linealidad, dentro de los cuales se encuentra el relacionado con la disminución del nivel de interferencia. Con el ánimo de brindar un aporte en la solución de esta problemática se propone modelar el comportamiento no lineal de FWM cuando se implementan sistemas de multiplexación de longitudes de onda por un único hilo de fibra óptica a fin de poder estimar las características fundamentales que rige esta tecnología y poder plantear un algoritmo que sea capaz de reducir la interferencia no lineal de cuarta onda (FWM. Como conclusión principal se encontró que el modelo propuesto reduce la interferencia no lineal FWM, lo que permite un aumento en la asignación de canales DWDM aumentando el ancho de banda establecido en cada enlace óptico.

  7. Algunos problemas provenientes de la Teoría de Rayos Aplicada a las Ecuaciones de Onda Sísmica

    Directory of Open Access Journals (Sweden)

    Carlos César Piedrahita Escobar

    2013-11-01

    Full Text Available La parte inicial de este artículo revisa la aplicación de la teoría de rayos en las ecuaciones de onda sísmicas, en particular, la propagación de ondas P. La parte final del artículo se centra en un par de problemas que se generan a partir del análisis utilizando teoría de rayos. Estos problemas posee un interés académico en su formulación matemática, además tienen un interés práctico para el  área de la Geofísica de Exploración y/o Producción.

  8. PUMP-PUMP FOUR-WAVE MIXING IN DISTRIBUTED FIBER RAMAN AMPLIFIERS MEZCLA DE CUATRO ONDAS ENTRE BOMBAS EN AMPLIFICADORES DE FIBRA RAMAN DISTRIBUIDOS

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    Marcelo Soto

    2007-08-01

    Full Text Available In this work, a comprehensive mathematical model which rigorously describes the interaction between stimulated Raman scattering (SRS and four-wave mixing (FWM in distributed fiber Raman amplifiers (DFRAs is presented. The parametric effects on DFRAs due to pump-pump FWM processes are completely characterized. Numerical simulations are contrasted with experimental measurements which were carried out with different configurations of DFRAs. The results validate the proposed mathematical model, which can be extended to include other non-linear effects. Finally, the pump-to-pump FWM effects on the spectral gain of a DFRA are analyzed.En este trabajo se presenta un modelo matemático que describe rigurosamente la interacción entre esparcimiento Raman estimulado (SRS y mezcla de cuatro ondas (FWM en amplificadores Raman distribuidos (DFRAs. Los efectos paramétricos ocurridos en DFRAs debido al proceso de FWM entre bombas, son completamente caracterizados. Los resultados de las simulaciones numéricas son contrastados con mediciones experimentales llevadas a cabo en diferentes configuraciones de DFRAs. Los resultados permiten validar el modelo matemático propuesto, el cual puede ser extendido para incluir otras no-linealidades. Finalmente, se analizan los efectos de FWM entre bombas en el comportamiento espectral de la ganancia de un DFRA.

  9. Detección en línea de onda-P en sismogramas 3-D utilizando redes neuronales

    Directory of Open Access Journals (Sweden)

    Alzate Carlos

    2003-08-01

    Full Text Available

    We have developed a P-wave arrival time detector of tectonic events over digital three-component records online. This process uses two different methods: the first one works with a LVR detector, and the second one uses a statistical classifier of classes (signal with P-wave and signal with seismic noise. Detection uses multi-layer perceptron neural network where is taken advantage of non-lineal input-output, relation, well-generalization, low computational demands, etc. These appropriate qualities for real time signal processing. The input data for the system becomes a normalized vector of seismic signal and its polarization arguments. Testes were done with data from IRIS and INGEOMINAS database. Although the system has a good perforance, its accuracy is not acceptable.

    Se desarrolla un detector en línea del tiempo de arribo de ondas P sobre registros electrónicos de tres componentes de eventos tectónicos. Se lleva a cabo la detección en línea de la onda-p empleando redes neuronales (RN, utilizando dos diferentes formas: en la primera se sintetiza el detector de LRV, mientras en la segunda se desarrolla un clasificador estadístico con las respectivas clases (señal con onda-p presente y señal con solo ruido presente. La detección se realiza empleando redes neuronales de tipo perceptrón multi-capa, en las cuales se aprovechan las siguientes cualidades: su capacidad de mapeo no lineal de entrada-salida, buena generalización, bajo costo computacional, entre otras. Las anteriores cualidades hacen que las RN sean apropiadas para el proceso de señales en tiempo real. Las entradas a la RN corresponden a

  10. Método numérico das diferenças finitas no domínio do tempo aplicado a ondas Alfvén em plasma astrofísico

    Science.gov (United States)

    Dos Santos, L. C.; Kintopp, J. A.; Jatenco-Pereira, V.; Opher, R.

    2003-08-01

    Ondas Alfvén em plasma astrofísico têm sido objeto de intenso estudo nas últimas décadas pelo fato de apresentarem papel importante em muitas áreas de pesquisa na astrofísica. Particularmente são importantes no mecanismo de aquecimento da coroa solar; em ventos estelares; em jatos galácticos e extragalácticos; em discos protoestelares, etc. A formulação para diferenças finitas no domínio do tempo (FDTD), aplicada a plasma magnetizado é desenvolvida para estudo das propriedades de ondas Alfvén em três dimensões (3D-FDTD). O método é aplicado inicialmente a um plasma homogêneo e isotérmico imerso em uma região com campo magnético externo B0, que sofre uma pequena perturbação. Uma vez gerada a onda, esta perturbação é retirada e, então analisamos a evolução temporal das ondas, bem como a forma de seu amortecimento.

  11. ONDAS DE MONTAÑA EN LA CAPA LÍMITE PLANETARIA DE LA REGIÓN ANDINA VENEZOLANA

    Directory of Open Access Journals (Sweden)

    HÉCTOR VÁSQUEZ

    2015-09-01

    Full Text Available Se evalúa las condiciones dinámicas y termodinámicas de la capa límite planetaria de la Región Andina Venezolana para la génesis de ondas de montaña. Para ello se calcula el número de Froude relacionando la estabilidad estática en presencia de accidentes orográficos con apoyo de perfiles verticales de viento, análisis de diagramas termodinámicos e imágenes de satélite. Se encuentra que cuando se presenta un flujo de aire perpendicular a la cordillera andina venezolana con vientos mayores a 10 m/s bajo condiciones de estabilidad o inversión de temperatura sobre su cima, disponibilidad de humedad mayor a 70% desde superficie a su cumbre y numero de Froude ligeramente superior a 1, el resultado es la presencia de ondas de montaña asociadas a nubes lenticulares a sotavento de la cadena montañosa.

  12. Velocidade da onda de pulso, pressão arterial e adipocitocinas em adultos jovens: estudo do Rio de Janeiro

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    Oswaldo Luiz Pizzi

    2013-01-01

    Full Text Available FUNDAMENTO: Dados sobre a avaliação não invasiva vascular e suas relações com variáveis de risco cardiovascular são escassos em jovens. OBJETIVO: Avaliar a relação entre a velocidade de onda de pulso e a pressão arterial,variáveis antropométricas e metabólicas, incluindo as adipocitocinas, em indivíduos adultos jovens. MÉTODOS: Foram avaliados 96 indivíduos (51 homens do estudo do Rio de Janeiro, de 26 a 35 anos (média 30,09 ± 1,92. Foram obtidos a velocidade de onda de pulso (método Complior, pressão arterial, índice de massa corporal, glicose, perfil lipídico, leptina, insulina, adiponectina e o índice de resistência à insulina HOMA-IR. Os indivíduos foram estratificados em três grupos segundo o tercil da VOP para cada sexo. RESULTADOS: O grupo com maior tercil de VOP mostrou maiores médias de pressão arterial sistólica, pressão arterial diastólica, pressão arterial média, índice de massa corporal, insulina, HOMA-IR e menores médias de adiponectina, além de maiores prevalências de diabetes mellitus/intolerância à glicose e hiperinsulinemia. Houve correlação significativa e positiva da velocidade da onda de pulso com pressão arterial sistólica, pressão arterial diastólica, pressão de pulso e pressão arterial média, índice de massa corporal, e LDL-colesterol e negativa com HDL-colesterol e adiponectina. Em modelo de regressão múltipla, após ajuste do HDL-colesterol, LDL-colesterol e adiponectina para sexo, idade, índice de massa corporal e pressão arterial média, apenas o sexo masculino e a pressão arterial média mantiveram correlação significativa com a velocidade de onda de pulso. CONCLUSÃO: A velocidade de onda de pulso em adultos jovens mostrou relação significativa com variáveis de risco cardiovascular, destacando-se o sexo masculino e a pressão arterial média como importantes variáveis no seu determinismo. Os achados sugerem que a medida da VOP pode ser útil para a

  13. Medida no invasiva de la presión arterial central mediante tonometría por aplanamiento. Análisis de la onda de pulso

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    Dr. Alvaro Hermida Amejeiras

    2012-12-01

    Full Text Available La tonometría por aplanamiento (TA es una medida indirecta, no invasiva, reproducible y validada para estimar la forma de la onda de pulso aórtica13. La propia forma de la onda de pulso, junto con la amplitud de la misma o su duración aportan información útil para el diagnóstico y manejo de diferentes entidades nosológicas (ej. cambios asociados al envejecimiento, hipertensión arterial, cardiopatía isquémica, diabetes mellitus, hábito tabáquico,....

  14. Resposta do detector de ondas gravitacionais Mario Schenberg ao "ringdown" de buraco negros

    Science.gov (United States)

    Costa, C. A.; Aguiar, O. D.; Magalhães, N. S.

    2003-08-01

    Acredita-se que quando duas estrelas de nêutrons coalescem, elas, eventualmente, formam um buraco negro com massa igual a soma das massas dos objetos originais. Durante a formação do buraco negro, o espaço-tempo em torno do sistema sofre perturbações que se propagam na forma de radiação gravitacional. A forma de onda associada a radiação gravitacional, durante este estágio, aproxima-se a uma senóide exponencialmente amortecida. Este tipo de sinal é conhecido como "ringdown", e seu comportamento e parametrização são muito bem conhecidos. Neste trabalho, simulamos computacionalmente sinais provenientes do "ringdown" de buracos negros, com a finalidade de testar o desempenho do detector de ondas gravitacionais Mario Schenberg em observá-los, quando entrar em funcionamento. Este primeiro teste teórico ajudou-nos a criar estratégias de detecção de sinais imersos no ruído instrumental. Calculamos a relação sinal-ruído como uma função da frequência, bem como sua integral dentro da faixa de sensibilidade do detector. Os resultados obtidos mostraram que o detector Schenberg terá sensibilidade suficiente para detectar este tipo de sinal, proveniente de fontes astrofísicas localizadas dentro de um raio de ~100kpc.

  15. Utilidad de la onda P300 como marcador de fatiga cognitiva en médicos internos residentes tras una jornada laboral de 24 horas

    OpenAIRE

    Estarelles Marco, María Jesús

    2015-01-01

    La onda P300 fue el primer potencial evocado cognitivo que se conoció, descrita en 1965 por Sutton et al. Se caracteriza por una gran onda positiva, máxima en línea media del cuero cabelludo, que aparece alrededor de 300 milisegundos después de un estímulo infrecuente y relevante para una tarea. Viene determinada por la latencia al pico máximo y por su amplitud, parámetros que pueden afectarse por la privación de sueño, como se ha visto en estudios previos. La afectación de las habilidade...

  16. Análise comparativa entre a refração clínica subjetiva e a automatizada obtida por sensor de frentes de onda

    OpenAIRE

    Freitas,Wilson de; Melo Júnior,Luiz Alberto Soares; Schor,Paulo; Campos,Mauro

    2007-01-01

    OBJETIVO: Avaliar e comparar os resultados obtidos da refração estática clínica com a obtida por sensor de frentes de onda. MÉTODOS: Estudo prospectivo, não seqüencial, de 279 olhos de 147 pacientes. Todos os pacientes foram examinados sob cicloplegia. Primeiro realizamos a refração clínica e a seguir a automatizada por sensor de frentes de onda. Os dados refracionais obtidos foram decompostos para análise vetorial. Foram analisados separadamente os dados de um olho por paciente e dos dois ol...

  17. Fundamentos sobre energia das ondas (e sistemas fotovoltaicos para bombagem de água)

    OpenAIRE

    Carneiro, Joaquim A. O.

    2017-01-01

    Texto de apoio às aulas da UC "Energias Renováveis II" do Mestrado em Ciências e Tecnologias do Ambiente Devido ao crescente aumento do consumo energético, os últimos anos têm sido caracterizados por uma aposta estratégica na procura de fontes de energia alternativas aos combustíveis fósseis tradicionais. Este documento aborda os principais fundamentos adstritos a dois diferentes tipos de fontes alternativas de energia, nomeadamente a energia das ondas do oceano e a energia solar fotovolta...

  18. Identificação de Período e Direção de Ondas Monocromáticas Através do Processamento de Imagens Ópticas

    Directory of Open Access Journals (Sweden)

    Henrique Rapizo

    2014-01-01

    Full Text Available Uma nova metodologia para a obtenção do período e direção de propagação de ondas de gravidade monocromáticas é apresentada baseada no processamento digital de sequencias de imagens. A análise fundamenta-se nos padrões espaçotemporais apresentados pelo brilho no plano da imagem. Foi empregado apenas um ponto de vista da cena visualizada, ou seja, processou-se imagens de somente uma câmera. A principal motivação é apresentar uma configuração simplificada e prática que permita a implementação operacional da medição, tanto em laboratório quanto em plataformas de petróleo ou no alto de prédios. Os resultados obtidos pela técnica aqui proposta são considerados promissores e correspondem a experimentos realizados em um tanque de ondas monocromáticas. O erro máximo na determinação do período de onda obtido foi de 0.06 segundos e na direção de propagação 7.80°. O processamento de imagens demonstra ser uma ferramenta valiosa para a medição dos parâmetros de período e direção de ondas.

  19. Diferencias entre las ondas gripales de verano y de otoño durante la pandemia de gripe (H1N1 2009 en Navarra

    Directory of Open Access Journals (Sweden)

    Jesús Castilla

    2011-01-01

    Full Text Available Fundamento: La gripe (H1N1 2009 produjo en Navarra una onda en verano y otra en otoño de 2009. El objetivo de este trabajo es comparar las características de ambas ondas epidémicas. Métodos: Analizamos la notificación individualizada de gripe, las confirmaciones virológicas en la red centinela de atención primaria, y los casos hospitalizados con confirmación de gripe en Navarra y comparamos los periodos de verano (semanas 21 a 39 de 2009 y otoño-invierno (semanas 40 de 2009 a 20 de 2010. Resultados: Durante 2009 hubo dos ondas de gripe A(H1N12009, con picos en julio y noviembre. En verano (semana 21 a 39 se notificaron 4.389 casos de síndrome gripal, siendo los más afectados los adultos jóvenes (58! entre 15 y 44 años. La mayor incidencia se registró tras las fiestas de San Fermín (92 casos por 100.000 en la semana 29 con retorno inmediato a niveles basales. En otoño se produjo una segunda onda que alcanzó tasas 7 veces mayores (667 casos por 100.000 en la semana 45 y se mantuvieron 9 semanas por encima del umbral epidémico, siendo el grupo de edad más afectado el de niños de 5 a 14 años (111 por 1000. En el pico de las dos ondas el porcentaje de frotis confirmados para gripe superó el 60!. Durante el verano se produjeron 66 ingresos con confirmación de gripe (H1N12009, y en otoño 158. La proporción de casos que requirieron ingresos en hospital fue mayor en verano (1,5! que en otoño (0,8!; p<0,0001. Conclusión: La circulación de la gripe fue mucho menor en verano. La aparición de casos graves se produjo tanto en momentos con alta como con baja incidencia de síndromes gripales.

  20. O uso de micro-ondas no preparo de emulsão e influência na estabilidade

    Directory of Open Access Journals (Sweden)

    Juliana de Souza

    2013-08-01

    Full Text Available O creme base não iônico descrito no Formulário Nacional foi preparado com duas formas de aquecimento: uma clássica, em banho-maria e chapa com as duas fases separadas; e uma alternativa, em forno micro-ondas com as fases juntas. Procedeu-se o estudo da estabilidade preliminar onde foram avaliados variação dos valores de pH, condutividade, viscosidade e espalhabilidade entre as bases. Estas foram armazenadas em diferentes condições como preconizado no Guia de Estabilidade de Produtos Cosméticos. As bases não apresentaram diferença significativa em relação a pH, condutividade e espalhabilidade máxima. A avaliação reológica demonstrou comportamento não newtoniano, com fluxo plástico e tixotropia. A base aquecida em micro-ondas demonstrou maior viscosidade e menor espalhabilidade, provavelmente decorrente da maior homogeneidade das gotículas observadas na análise microscópica. Pode-se observar que a utilização de outra fonte de aquecimento mais rápida não modificou o produto, podendo ser utilizada como forma alternativa.

  1. Laser a fibra dopada com Érbio com múltiplos comprimentos de onda e múltiplos regimes de operação simultâneos

    OpenAIRE

    Cláudia Barros dos Santos

    2011-01-01

    Neste trabalho, fez-se a inserção de duas grades de difração matriciais com guias de onda, ou AWGs (Arrayed Waveguide Gratings) em uma cavidade laser de fibra dopada com Érbio, onde um único meio de ganho em temperatura ambiente pode gerar ação laser em múltiplos comprimentos de onda, com emissões simultâneas e controladas individualmente. A configuração utilizada permitiu o teste com diferentes regimes de operação simultâneos dentro da cavidade. Mostramos a possibilidade de emissão laser em ...

  2. Diseño preliminar de un rotor de onda para motores con microturbina

    Directory of Open Access Journals (Sweden)

    Gina P. Pérez B.

    2009-01-01

    Full Text Available Este trabajo presenta un analisis preliminar sobre los beneficios de ia implementacion de un rotor de onda en una micro-turbina convencional. Este estudio se enfoca en la consecución de un punto de disefio por medio de cálculos térmicos para así lograr una geometría adecuada, la cual podra ser evaluada por medio de Dinámica de Flujo Computacional CFD para determinar la viabilidad de la implementacion de este dispositive en un motor con micro-turbina a gas de 30 lb, de empuje.

  3. Efeito de ondas de choque na placa de crescimento de coelhos Effect of shock waves upon the growth plate in rabbits

    Directory of Open Access Journals (Sweden)

    Guilherme Giusti

    2005-01-01

    Full Text Available OBJETIVO: Avaliar os efeitos da aplicação de ondas de choque na placa de crescimento de coelhos, variando a energia e o número de ondas aplicadas. MATERIAL E MÉTODOS: Foram estudados 30 coelhos com idade de cinco semanas divididos em seis grupos. O aparelho gerador de ondas de choque foi o OSSATRON (HMT. Os animais foram submetidos a aplicações na placa de crescimento proximal da tíbia esquerda, variando a intensidade (14, 21,28kV e o número de ondas (1000 e 4000. A tíbia direita foi usada como controle. Os animais foram sacrificados após seis semanas e sua avaliação foi feita por meio da mensuração do comprimento das tíbias e pela análise microscópica da placa de crescimento. Os resultados de mensuração da área da placa e do comprimento das tíbias foram comparados com o grupo controle e entre os grupos, utilizando-se estudos estatísticos. RESULTADOS: Neste estudo não ocorreram alterações estatisticamente significantes nas medidas da área da placa ou do comprimento da tíbia após a aplicação de ondas de choque em nenhum dos grupos. Foi observada tendência de ocorrer uma diferença de crescimento das tíbias entre os grupos submetidos a 1.000 impulsos e os grupos submetidos a 4.000 impulsos, mas esta diferença não foi considerada significante. Foi observada também a formação de hematoma no local da aplicação nos grupos que receberam ondas com maior energia, evoluindo com regressão espontânea sem necessidade de cuidados especiais. CONCLUSÕES: A aplicação de ondas de choque na região proximal da tíbia de coelhos imaturos, nas formas descritas, não teve nenhum efeito na placa de crescimento, de acordo com os métodos de avaliação usados neste estudo.OBJECTIVE: To evaluate the effects of shock waves upon the growth plate in rabbits by varying the energy and number of applied waves. MATERIAL AND METHODS: Six groups of five rabbits aged 5 weeks (Total: 30 were studied. OSSATRON (HMT was used to generate

  4. Educa??o ind?gena makuxi pelas ondas da FM Monte Roraima (2003-2008)

    OpenAIRE

    Silva, Antonia Costa da

    2009-01-01

    A proposta da presente pesquisa foi estudar o uso do r?dio no processo de educa??o ind?gena, atrav?s de um estudo de caso. Por ser um dos meios de comunica??o de massa, que presta grandes servi?os ? sociedade atrav?s da informa??o e do entretenimento, o r?dio tem se transformado ao longo de sua exist?ncia. Com o avan?o tecnol?gico, nos dias atuais, a instala??o e a recep??o das ondas de r?dio se tornaram acess?veis em todo o mundo. Ainda com o surgimento de outros meios de comunica??o, como a...

  5. Simplified dynamic simulation of a traveling wave nuclear reactor; Simulacion dinamica simplificada de un reactor nuclear de onda viajera

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez M, H.; Espinosa P, G. [Universidad Autonoma Metropolitana, Unidad Iztapalapa, Area de Ingenieria en Recursos Energeticos, San Rafael Atlixco No. 186, Col. Vicentina, 09340 Ciudad de Mexico (Mexico); Francois, J. L. [UNAM, Facultad de Ingenieria, Paseo Cuauhnahuac 8532, Jiutepec 62550, Morelos (Mexico); Lopez S, R., E-mail: heribertosanchez7@hotmail.com [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2016-09-15

    In this work the nuclear fuel burn wave in a fast traveling wave reactor (TWR) is presented, using the reduced model of the neutron diffusion equation, considering only the axial component, and the equations of the transuranic dynamics of U-Pu and a radionuclide of Pu. Two critical zones of the reactor are considered, one enriched with U-Pu called ignition zone and the other impoverished zone or of U-238, named breeding zone. Occupying Na as refrigerant within TWR, and Fe as structural material; both are present in the ignition and breeding zones. Considering as a fissile material the Pu, since by neutron capture the U is transformed into Pu, thus increasing the quantity of Pu more than that of U; in this way the fuel burn stability with the wave dynamics is understood. The calculation of the results was approached numerically to determine the temporal space evolution of the neutron flux in this system and of the main isotopes involved in the burning process. (Author)

  6. Desempenho de diferentes guias de ondas para uso com o analisador de umidade TRASE Performance of different waveguides for use with the TRASE water content analyser

    Directory of Open Access Journals (Sweden)

    Eugênio F. Coelho

    2001-04-01

    Full Text Available O trabalho teve como objetivo avaliar a relação entre a umidade e a constante dielétrica aparente do solo e diferentes guias de onda para uso com o analisador de umidade Trase, que opera de acordo com o princípio da reflectometria no domínio do tempo - TDR. Amostras indeformadas e deformadas de duas manchas de textura diferente de um Latossolo Amarelo Distrófico foram retiradas do campo e acondicionadas em recipientes de 10 L, perfazendo quatro repetições para cada textura e estrutura. Foram construídas três diferentes guias de onda, com hastes de 0,15 m, sendo uma com capacitor e uma sem capacitor no início da guia, com espaçamento de 0,009 m entre hastes e outra sem capacitor, com espaçamento de 0,022 m entre hastes. Essas guias de onda, juntamente com guias originais do fabricante com hastes de 0,20 m, espaçadas 0,022 m, foram inseridas individualmente em cada recipiente. Dados de umidade obtidos gravimetricamente e pelo analisador TRASE, e da constante dielétrica, foram tomados usando-se todas as guias de onda em cada recipiente durante a secagem do solo, de 0,35 m³ m-3 a 0,10 m³ m-3. Três modelos matemáticos foram ajustados aos dados de umidade e da correspondente constante dielétrica do solo gerados pelas guias de onda do fabricante. Um modelo exponencial foi considerado como mais adequado para estimativas dos teores de água, em função da constante dielétrica para a guia de onda do fabricante. Todas as guias de onda avaliadas apresentam viabilidade de uso, desde que previamente calibradas.The objective of this work was to evaluate the relations between soil water content and the soil bulk dielectric constant, and to study different waveguides of a TRASE soil water content analyzer that operates according to TDR principles. Non-destructive and destructive samples of two sites of different texture of a Dystrophic Yellow Latossol were collected and packed into 10 L containers, resulting in four replications for each

  7. INTEGRAÇÃO DE MODELAGEM NUMÉRICA (SWAN E DADOS DE CAMPO NA DETERMINAÇÃO DO CLIMA DE ONDAS NO LITORAL SETENTRIONAL DO RIO GRANDE DO NORTE

    Directory of Open Access Journals (Sweden)

    Maria de Fatima Alves de Matos

    2017-05-01

    Full Text Available Este artigo apresenta os resultados da aplicação do modelo numérico Simulating WAves Nearshore (SWAN com análises comparativas das medidas obtidas a partir dos resultados de modelagem e de medições durante as campanhas de campo em 2010 e 2012 no Litoral Setentrional do Rio Grande do Norte (NE do Brasil. O objetivo principal do presente estudo foi aplicar e validar o modelo numérico SWAN na determinação do clima de ondas, avaliar seus pontos fortes e limitações para a região de interesse. Os dados de campo realizados em dois pontos próximo da costa em profundidades de 3 m (PT_1 e 6 m (PT_2 por meio do uso de dois adcp: AWAC e AQUADOPP. Os dados adquiridos com estes equipamentos foram processados e permitiram a realização de análises espectrais de altura significativa, HS (m, período médio, Tmed (s, e direção média, DIR (º. Para a implementação do modelo SWAN foram empregados para as condições de contorno os dados de agitação a partir do modelo de 3ª geração de escala oceânica Wavewatch III. Para o refinamento e aplicabilidade do modelo, foram introduzidos dados de ventos e maré locais, corrigidos com base no Manual de Engenharia Costeira (CEM, permitindo assim, melhor ajuste dos resultados da modelagem. O domínio de cálculo foi referenciado para as dimensões da carta náutica 720, com três malhas regulares de diferentes dimensões e resolução: externa, intermediária e interna, sendo esta última, utilizada para fornecer os parâmetros de propagação da onda ao longo da costa. As configurações usadas para o SWAN foram as padrões em modo estacionário, com as formulações KOMEN, a dissipação devido à rebentação induzida pelo fundo com atrito de fundo usando a formulação JONSWAP com coeficiente de atrito С = 0.015m2s-3 em condições wind sea, e a formulação whitecapping ou excesso de declividade, as interações entre tríades de ondas e interações onda-onda quádrupla. As estat

  8. Simulaciones numéricas de las ondas electromagnéticas en coordenadas nulas

    OpenAIRE

    Jarrouj, Yoliano; Rosales, Luis; Serrano, Orlando

    2006-01-01

    En este trabajo se resolvió la ecuación de onda no lineal 3D para la evolución característica del campo electromagnético. Se Desarrolló un código tridimensional en Fortran 90, que fue calibrado hasta lograr la estabilidad y convergencia a segundo orden. El código desarrollado, permitió el cálculo preciso de los patrones de radiación electromagnética en el infinito. Como una aplicación se simuló la evolución no lineal de pulsos electromagnéticos asimétricos de radiación entrante que se propaga...

  9. Ondas de Elliott: la clave para obtener excelentes beneficios en el mercado de valores

    Directory of Open Access Journals (Sweden)

    Javier Cristóbal Calvo Espinal

    2001-12-01

    Full Text Available Este artículo pretende identificar los criterios básicos de la teoría de las Ondas de Elliott, uno de los análisis técnicos mas elaborados hasta el momento ya que cuenta con un alto grado predictivo. La economía mundial gira hoy más que nunca alrededor del mercado bursátil, bajo este marco los administradores de portafolio le dan una mayor importancia a su cartera de renta variable, acciones. La teoría académica sobre portafolio expuesta par Markowitz, Sharpe, Tobin, entre otros, posee limitaciones a la hora de llevarla a la práctica, ya que es un método de diversificación atemporal, o estático. Es decir, resulta optima en un momento o fecha determinados, pero puede resultar no óptimo al no tener en cuenta las expectativas de los inversionistas y de proyecciones del entorno económico y social. Esto hace necesaria la revisión periódica del portafolio, teniendo en cuenta los cambios en los precios del mercado. Es aquí donde cobra importancia el análisis técnico y fundamental, como herramienta para predecir en el futuro el precio probable de un titulo valor de estas características. Sin embargo, el análisis fundamental no es el objeto de este articulo. Dentro del análisis técnico encontramos numerosos estudios, pero se considera que el más significativo en la actualidad es el de las Ondas de Elliot. Para comprender esta teoría es necesario reformular el concepto de tiempo en el mercado bursátil, olvidando la noción lineal e inagotable del tiempo por una cíclica y repetitiva, que fue planteada desde Nietzsche bajo el título del Eterno Retorno, En efecto, las Ondas de Elliott describen el comportamiento de los precios de las acciones a través de patrones recurrentes en el mercado accionario. Aparte de estos patrones. Ellioll basó también su postulado en la secuencia de números Fibonacci. Para justificar la aplicabilidad del modelo se presentan cuatro análisis basados en la teoría de Elliot, estos corresponden al

  10. Modelización numérica de estados iniciales de ondas de roturas de presas

    OpenAIRE

    Shigematsu, Takaaki; Liu, Philip F. L.; Kazuki, Oda

    2004-01-01

    En este artículo, se presenta una investigación numérica de ondas de rotura de presas en sus estados iniciales. El modelo numérico está basado en las ecuaciones de Navier-Stokes con el promedio de Reynolds (RANS) y con un modelo de cierre para la turbulencia k-e. (J. Fluid Mech. 359, 1998, 239). Los resultados numéricos se comparan con datos de experimentos existentes (J. Fluid Mech. 374, 1998, 407) así como con datos de nuevos experimentos. Se observa buena concordancia entre ambos. Se estud...

  11. DESARROLLO PROGRESIVO DE ONDA J GIGANTE Y PROLONGACIÓN EXTREMA DEL INTERVALO QT EN LA HIPOTERMIA INDUCIDA / Progressive development of giant J wave and extreme prolongation of QT interval in induced hypothermia

    Directory of Open Access Journals (Sweden)

    Yaniel Castro Torres

    2013-07-01

    Full Text Available Resumen: La aparición de ondas J es el suceso más común observado en el electrocardiograma de un paciente con hipotermia. Se presenta el caso de un hombre de 47 años, que le fue inducido un paro cardíaco mediante hipotermia para una cirugía cardíaca. En el trazo electrocardiográfico se evidencia el desarrollo progresivo de una onda J exuberante. Estas ondas pueden simular un infarto agudo de miocardio y se consideran una variable predictora de arritmogénesis. / Abstract: The appearance of J waves is the most common event observed in the electrocardiogram of a patient with hypothermia. We report the case of 47 years-old man, who underwent cardiac arrest using hypothermia for cardiac surgery. In the electrocardiographic tracing the progressive development of giant J waves is evident. These waves can mimic acute myocardial infarction and are considered a predictor of arrhythmogenesis.

  12. Sinterização ultrarrápida por micro-ondas de compósitos particulados PZT/FCO preparados por mistura em ultrassom

    Directory of Open Access Journals (Sweden)

    C. P. Fernandez

    Full Text Available Resumo Pós de Pb(Zr0,53Ti0,47O3 (PZT e Fe2CoO4 (FCO, foram sintetizados separadamente pelo método Pechini e misturados em ultrassom, nas proporções molares 80/20 e 50/50 (PZT/FCO. Os compósitos preparados foram prensados e submetidos à sinterização em forno convencional e sinterização ultrarrápida assistida por micro-ondas. A caracterização estrutural e microestrutural das amostras foram realizadas por difração de raios X e microscopia eletrônica de varredura, respectivamente. Medidas de constante dielétrica em função da temperatura, resistividade elétrica e coeficiente de acoplamento magnetoelétrico foram também realizadas. Os resultados evidenciaram que o método de mistura do PZT com a FCO por ultrassom foi rápido e eficiente, gerando, após sinterização, compósitos particulados com conectividade global (0-3 e distribuição uniforme de grãos da fase ferromagnética (FCO na matriz ferroelétrica (PZT. Da análise estrutural, verificou-se que a sinterização por micro-ondas propiciou um arranjo diferenciado no esquema de conectividade local na amostra (1-3 e (2-3, relacionada com a intensificação dos processos de difusão que ocorrem nesse tipo de sinterização principalmente em sistemas nanométricos. Pelos altos valores de resistividade obtidos, comprovou-se que a integridade das fases foi conservada nos dois métodos de sinterização, sendo mais eficiente na sinterização por micro-ondas, característica que garantiu o comportamento magnetoelétrico em todos os compósitos estudados neste trabalho. Os valores do campo Hmax foram dependentes da concentração da fase ferrita e da sinterização; para a composição 80/20 de 1,4 e 1,9 kOe, e para 50/50 de 3,5 e 3,0 kOe nas amostras sinterizadas por micro-ondas e convencionalmente, compatíveis com a literatura e que confirmaram a integridade das fases constituintes PZT e FCO.

  13. Mineralogía y ceramicidad de las arcillas del yacimiento de Sitjar, Onda (Castellón)

    OpenAIRE

    Sanfeliu, T.; Queralt, I.; Martínez, Salvador; Fuente Cullell, Carlos de la

    1989-01-01

    Este trabajo tiene por objeto la caracterización mineralógica y físico-química de las arcillas terciarias explotadas en el yacimiento de Sitjar, cercano a la localidad de Onda (Castellón), utilizadas comomateria prima por la industria ceramica castellonense. Se estudian también algunas propiedades ceramicas de estas arcillas, incidiendo en el comportamiento térmico, para su correcta aplicación. a composición química y mineralógica posibilita su utilización como aditivo para la fabricaci6n de ...

  14. Ferramenta SIG para Modelos de Propagação de Ondas. Desenvolvimentos Preliminares

    OpenAIRE

    Zózimo, A. C.; Charneca, N.; Gonçalves, A.; Fortes, C. J. E. M.

    2005-01-01

    SIMAR é um Sistema Integrado de Modelação da Agitação maRítima, para estudos de propagação e deformação da agitação marítima em zonas costeiras e portuárias. Este Sistema é baseado num Sistema de Informação Geográfica (SIG) e inclui um conjunto de módulos correspondentes aos modelos de propagação e deformação de ondas. A comunicação entre o SIG e os módulos é efectuada por uma interface gráfica construída para o efeito. Nesta comunicação, apresenta-se uma versão preliminar do SIMAR e das s...

  15. Análise do método de medição de viscosidade de líquidos por ultra-som usando a reflexão de ondas de cisalhamento.

    OpenAIRE

    Édiguer Enrique Franco Guzmán

    2006-01-01

    Neste trabalho é analisada a medição de viscosidade de líquidos por ultrasom pelo método da reflexão de ondas de cisalhamento. O método baseiase na medição da magnitude e fase do coeficiente de reflexão quando as ondas de cisalhamento incidem na interface entre um sólido e o líquido testado. Foram analisados os conceitos teóricos do método da medição de viscosidade e desenvolvida a metodologia experimental a fim de evitar a influência indesejada de fatores externos, como a temperatura e a ins...

  16. El método de los elementos finitos para el modelado de ondas con un procesador vectorial

    OpenAIRE

    Sanz, F.; Serón, Francisco J.; Kindelan, M.; Pérez, C.

    1990-01-01

    El objetivo de este trabajo es analizar los aspectos computacionales del Método de los Eleinentos Finitos para la resolución de las ecuaciones de onda elásticas. Se analizan las técnicas nuinéricas necesarias desde el punto de vista de la precisión, prestaciones y necesidades de almacenamiento cuando se impleinentan en procesadores escalares y vectoriales con gran capacidad de almacenamiento. El método se ha iinplementado en un IBM 3090 con procesador vectorial usando diferentes algorit...

  17. Evaluación del impacto del Programa Ondas en el departamento de Sucre

    Directory of Open Access Journals (Sweden)

    Gloria Malbina Martínez Pantoja

    2015-10-01

    Full Text Available Uno de los indicadores que revelan el grado de desarrollo de un país lo constituyen los procesos de investigación que genera. La investigación Evaluación del impacto del Programa Ondas en el departamento de Sucre en el periodo de 2007 a 2009, se realizó en estudiantes y maestros de las instituciones educativas de este departamento, concretamente en lo referido a sus lineamientos y objetivos. Esta investigación fue de tipo evaluativo, con métodos cualitativos y cuantitativos. Mediante ella se determinó que el desarrollo del Programa Ondas impactó de manera significativa, puesto que posibilitó en los actores participantes la apropiación de una cultura investigativa que trajo consigo: espíritu de indagación, resignificación de la práctica pedagógica del maestro, vinculación de actores externos, construcción de comunidades, y, en general, asumir la investigación como una estrategia pedagógica para experimentar procesos de aprendizaje alternativos a los tradicionales. AbstractThe methods used to conduct research are one of the indicators that show the degree of a country’s development. The research related to the evaluation about the impact of “ONDAS” program in students and teachers of educational institutions in Sucre, Caribbean region, specifically from 2007 to 2009, was carried out based on assessment objectives using qualitative and quantitative methods in order to determine that the impact was significant, since it enabled the actors involved in the appropriation of a research culture embracing a spirit of inquiry, the new meaning of pedagogical practice mastery, linking of external actors, building communities, and, in general, making the assumption that the research was conducted as a pedagogical strategy to experience a method alternative to traditional learning processes.

  18. Análise da velocidade do vento e altura de onda em incidentes de naufrágio na costa brasileira entre os estados do Sergipe e do Rio Grande do Sul

    Directory of Open Access Journals (Sweden)

    Eduardo Vetromilla Fuentes

    2013-09-01

    Full Text Available A ocorrência de naufrágios pode ser atribuída a vários fatores. Contudo, embarcações de pequeno porte usadas na pesca costeira, são geralmente mais suscetíveis aos fatores meteorológicos e oceânicos. O objetivo desse estudo foi analisar o comportamento da velocidade do vento e altura significativa de onda em relação à ocorrência de naufrágios na costa brasileira, entre os estados de Sergipe e Rio Grande do Sul. As frequências trimestral e mensal de naufrágios registrados entre Janeiro/2004 e Junho/2008 foram comparados com os ventos e com a altura significativa de ondas. As velocidades médias e máximas do vento nos dias e áreas de ocorrência, bem como a altura significativa de onda, foram comparadas aos valores históricos dessas variáveis. Foram observados ventos e ondas acima da climatologia em 54% e 46% das ocorrências de naufrágio, respectivamente. Em vários casos, o vento atingiu velocidades muito elevadas, sendo a provável causa para a ocorrência desses naufrágios. Os resultados apontaram para uma maior incidência de naufrágios em ambientes costeiros das regiões sudeste e sul do Brasil, com maior ocorrência entre os meses de março e agosto, envolvendo principalmente embarcações de pequeno porte (94%, utilizadas na pesca costeira. Os resultados encontrados reforçam a necessidade do envio de informações meteorológicas e oceanográficas para pequenas embarcações, em especial àquelas empregadas na atividade de pesca costeira.

  19. Alterações morfológicas causadas pela reaplicação de ondas de choque eletro-hidráulicas, no rim de ratos Morphologic alterations caused by electro-hydraulic shock waves reapplication in rat kidney

    Directory of Open Access Journals (Sweden)

    Juliano José Jorge

    2002-03-01

    Full Text Available A recidiva de cálculos urinários é freqüente, necessitando múltiplas aplicações de ondas de choque para seu tratamento. O objetivo deste trabalho é pesquisar alterações morfológicas agudas ocorridas nos rins de ratos submetidos a reaplicação de ondas de choque. Foram utilizados 48 ratos, distribuídos em 4 grupos de 12 animais. O grupo I recebeu duas aplicações de 2000 ondas de choque, com 14 KV de intensidade em intervalo de 14 dias entre as aplicações. O grupo II serviu de controle. O grupo III recebeu apenas uma aplicação. O grupo IV serviu de controle. Os rins foram examinados após 72 horas da aplicação das ondas de choque, observando: hemorragias subcapsular, intersticial e glomerular; perda da junção corticomedular; infiltrado crônico; necrose cortical e edema perivascular. Os resultados mostraram que a reaplicação de ondas de choque eletro-hidráulicas sobre rins de ratos não causou maiores danos que os produzidos pela primeira aplicação.Urinary calculus recidives are frequents, needing shock waves multiple applications for its treatment. This research studies acute morphological changes that occur in the kidneys of rats subjected to electro-hydraulic shock waves reapplication. The experiment used 48 rats, divided in four groups of 12. The first group received two 2,000 shock waves applications with 14 kV intensity and a fourteen-day interval between the applications. The third group received only one 2,000 shock waves application of the same intensity. The second and fourth groups were control groups. The kidneys were examined 72 hours after the application, observing: subcapsular, interstitial and glomerular hemorrhage; corticol results showed that electro-hydraulic shock reapplication in the rat kidneys didn’t greater damages than the first application.

  20. Amplificador e conversor de comprimento de onda híbrido TDFA/FOPA para comunicações ópticas

    OpenAIRE

    de Freitas Guimarães, Glendo

    2006-01-01

    A região de comprimento de onda do espectro eletromagnético usado nas telecomunicações ópticas são definidas pela International Telecommunications Union (ITU) como, banda C (Conventional Band, 1530-1565 nm), banda L (Long Wavelength Band, 1565- 1625 nm), banda S (Short Wavelength Band, 1450-1530 nm), e bandas mais distantes de ambos os lados da banda C. Atualmente, a única banda utilizada comercialmente para telecomunicações ópticas e a banda C. O constante crescimento de tráfico de dados, vo...

  1. Incremento en la dispersión de la onda P al disminuir el tiempo de eyección auricular en hipertensos y prehipertensos Increment in P wave dispersion by decreasing atrial ejection time in hypertensive and prehypertensive patients

    Directory of Open Access Journals (Sweden)

    Elibet Chávez

    2011-07-01

    Full Text Available Introducción: hace algunos años se viene estudiando la relación entre disfunción diastólica y dispersión de la onda P del electrocardiograma, y en este sentido, la ecocardiografía emerge como herramienta para mejorar la estratificación de riesgo en hipertensos leves. Objetivo: determinar la dependencia de la dispersión de la onda P del electrocardiograma de variables ecocardiográficas en una población pediátrica. Métodos: se estudiaron 400 niños, de un total de 450, pertenecientes a tres escuelas primarias, y se excluyeron aquellos cuyos padres no desearon que participaran en el estudio y a quienes tuvieran patologías congénitas conocidas. Se realizó electrocardiograma de superficie de doce derivaciones y se practicaron cuatro tomas de presión arterial. Se midieron los valores de P máxima y P mínima, y se calculó la dispersión de la onda P del electrocardiograma; además se hizo, ecocardiografía para mediciones estructurales y Doppler pulsado del flujo mitral. Resultados: los valores de media para la duración de la onda A del flujo mitral no muestran diferencias significativas; sin embargo, existe un coeficiente de correlación (r y p significativos entre la dispersión de la onda P y la duración de la onda A del flujo mitral para normotensos (r= - 0,117 p=0,05, prehipertensos (r= - 0,309 p=0,001 e hipertensos (r= - 0,586 p=0,001. Existen diferencias significativas entre las medias de dispersión de la onda P entre los grupos de diagnóstico. Conclusiones: se evidencia dependencia de la dispersión de la onda P, del electrocardiograma y de la duración de la onda A del flujo de entrada mitral, hechos que se relacionan con riesgo de fibrilación auricular en el adulto, por lo que quizás este resultado dé un acercamiento a predicciones de riesgo más tempranas en edades pediátricas.Introduction: the relationship between diastolic dysfunction and P wave dispersion in the electrocardiogram is being studied since some

  2. Modeling the effect of the seismic wave propagation in buried continuous pipelines; Modelacion del efecto de propagacion de ondas sismicas en tuberias continuas enterradas

    Energy Technology Data Exchange (ETDEWEB)

    Melchor Garcia, Nicolas Ageo

    2005-02-15

    -tuberia. Algunos modelos analiticos son presentados y discutidos con gran detalle. Se trata de contribuir en particular en los siguientes aspectos: Primero, intenta ser un trabajo de referencia para los ingenieros geotecnistas que se enfrentan a problemas relacionados con el fenomeno propagacion de ondas sismicas en estructuras enterradas o problemas afines, ya que dentro de la literatura consultada existen muchos principios aqui presentados que estan relacionados con la ingenieria sismica, el modulo de reaccion, asi como tambien con expresiones o investigaciones realizadas en pilotes. Segundo, se presenta un modelo numerico cuasiestatico que analiza la tuberia continua a traves de un vector de fuerzas de tipo senoidal. El analisis de los esfuerzos y deformaciones que le transmite el suelo a la tuberia se hace utilizando un modelo de interaccion suelo-tuberia. Para un nivel bajo de deformaciones se considera un comportamiento de transferencia elastico en la interfaz suelo-tuberia. En el caso de deformaciones mayores se supone que se presenta deslizamiento debido a que el suelo circundante presenta falla por cortante en el suelo que lo rodea. El analisis cubre unicamente el caso de deformaciones axiales en tramos rectos. Finalmente, intenta dar una serie de recomendaciones para futuros trabajos de investigacion sobre la modelacion de tuberias enterradas. En este trabajo, la influencia de varios aspectos sobre la respuesta de tuberias a la propagacion de ondas sismicas es analizada y discutida; tales como las condiciones de topografia, geologia, estratigrafia del suelo y los cambios de rigidez en el suelo que se encuentra alrededor de la tuberia.

  3. Número e espaçamento entre hastes de guia de onda para medida da umidade do solo com TDR Number and spacing between wave guide rods for measurement of soil water content with TDR

    Directory of Open Access Journals (Sweden)

    Eugênio F. Coelho

    2003-08-01

    Full Text Available Com este trabalho, objetivou-se avaliar o desempenho de diferentes modelos matemáticos para ajuste dos dados de umidade, em função da constante dielétrica aparente do solo, e a viabilidade de uso de guias de onda de duas e três hastes, com diferentes espaçamentos. Amostras de solo deformadas foram acondicionadas em segmentos de tubos de PVC de 0,075 m de diâmetro. Construíram-se 24 guias de onda com capacitor e 24 guias de onda sem capacitor, sendo que, para cada tipo, 12 guias de onda de duas hastes e 12 de três hastes, com espaçamento entre hastes de 0,009 a 0,022 m, de impedâncias previamente determinadas, foram inseridas no solo, após a saturação em cada segmento de tubo. Dados de umidade do solo determinados por gravimetria e da constante dielétrica aparente obtidos pelo analisador Trase System, foram tomados em cada recipiente durante a secagem do solo de 0,31 a 0,13 m³ m-3. Cinco modelos matemáticos foram ajustados aos dados de umidade em função da correspondente constante dielétrica aparente do solo e o efeito dos modelos na obtenção da umidade do solo, em função da constante dielétrica aparente, foi avaliado estatisticamente. O modelo de Malicki foi o de melhor ajuste dos dados da constante dielétrica aparente, em função da umidade do solo. As guias de onda de três hastes, de diâmetro 0,003 m, comprimento 0,15 m, com espaçamentos entre hastes de 0,017 m, foram as de melhor desempenho, enquanto as guias de onda de três hastes sem capacitor indicaram melhor desempenho na determinação da umidade do solo, comparadas com as de duas hastes sem capacitor. As guias de onda de três hastes sem capacitor apresentaram melhor desempenho na determinação da umidade do solo que as de três hastes com capacitor.The objective of this study was to evaluate the performance of different mathematical models to adjust the humidity data as a function of the apparent dielectric constant of the soil and to evaluate the

  4. Aplicación de técnicas sísmicas como herramienta para la obtención de parámetros geomecánicos del terreno en la urbanización Camposol, Mazarrón

    OpenAIRE

    Morales Giménez, Pedro

    2015-01-01

    Para el cálculo de parámetros geomecánicos del terreno, pueden ser empleados los valores de las velocidades de ondas compresionales (P) y ondas de cizalla (S) mediante métodos geofísicos superficiales. Estos parámetros son fundamentales para obtener las características de las zonas en las que se procede a la realización de obras civiles, edificios, etc. Y a la minimización del riesgo sísmico en las mismas, así como de asentamientos incontrolados del terreno, estabilidad de t...

  5. Estimación de la velocidad de propagación aórtica basada en el análisis de la onda de pulso radial Velocity estimation of aortic propagation based on radial pulse wave analysis

    Directory of Open Access Journals (Sweden)

    Fernando Clara

    2011-06-01

    Full Text Available Se exploró la posibilidad de utilizar la morfología del registro de onda de pulso radial obtenida mediante un transductor de movimiento para evaluar la velocidad de propagación aórtica. Se efectuó el registro de onda de pulso en arteria radial mediante un transductor apoyado sobre la zona de palpación del pulso, sobre un conjunto de 167 voluntarios varones sanos normotensos de edades comprendidas entre la 2ª y la 7ª década. Se identificó en los registros la onda reflejada y se definió un coeficiente de velocidad como el cociente entre la talla del individuo y el tiempo transcurrido entre el máximo de la onda sistólica y el instante de llegada de dicha onda. Se halló que en los normotensos el coeficiente mencionado aumentó en forma lineal con la edad, en una proporción similar al aumento de velocidad de propagación aórtica medido con otros métodos. Se repitió el procedimiento en otro conjunto de 125 varones hipertensos sin otros factores de riesgo, de edades entre la 3ª y la 7ª década, hallándose valores similares a los normotensos solamente en la 3ª década, a partir de la cual se registró un incremento significativo de dicho índice. Tales hallazgos sustentan la factibilidad de utilizar tal tipo de registros para evaluar indirectamente la velocidad de propagación junto con el índice de aumentación, un parámetro habitualmente utilizado en el análisis de onda de pulso.We analyzed the possibility of using the radial pulse wave morphology, obtained by a movement transducer, to evaluate the aortic pulse wave velocity. The radial pulse wave signals were obtained by using a transducer, located on the pulse palpation area, in 167 healthy normotensive male volunteers, ages 20 to 70. The reflected wave was identified in every case. Also, a speed coefficient was defined as the ratio between the individual's height and the time between the maximum systolic wave and the arrival time of the reflected wave. We found that the

  6. Onda Circumpolar Antártica: Influência na Variabilidade Climática do Estado do Rio Grande do Sul

    Directory of Open Access Journals (Sweden)

    Kyssyanne Samihra Santos Oliveira

    Full Text Available Resumo A influência das componentes interanuais (números de onda 2 – OCA2 e 3 – OCA3 da Onda Circumpolar Antártica sobre anomalias anuais regionais de precipitação do Rio Grande do Sul foi investigada utilizando-se dados meteoceanográficos que cobriram o período de 1981 a 2006. Os resultados encontrados aqui mostraram que enquanto existe um padrão claro de associação entre o comportamento da OCA3, ao longo do cinturão de latitude extratropical, e as anomalias anuais de precipitação nas quatro regiões homogêneas identificadas no RS, o mesmo não foi observado para a OCA2. Foi encontrado que anomalias de PNMM associadas a OCA3, no setor Atlântico Oeste do Oceano Sul, parecem ter um papel principal na modulação das anomalias anuais de precipitação no Rio Grande do Sul. Já as anomalias de TSM associadas a OCA3 parecem ter um papel secundário. Além disso, foi observada uma forte influência de ambas as componentes nas anomalias anuais de precipitação via anomalias anuais locais de umidade específica. Os padrões de associação entre as componentes OCA2 e OCA3 e as anomalias anuais de precipitação encontrados aqui fornecem informações importantes tanto para o entendimento do clima no Estado, como para o aprimoramento da previsão climática para o mesmo.

  7. El método de los elementos finitos para el modelado de la ecuación de ondas con un procesador vectorial

    OpenAIRE

    Seron, F.; Sanz, F.; Kindelan, M.; C.Perez, C.Perez

    1990-01-01

    El objetivo de este trabajo es analizar los aspectos computacionales del Método de los Elementos Finitos para la resolución de las ecuaciones de onda elásticas. Se analizan las técnicas numéricas necesarias desde el punto de vista de la precisión, prestaciones y necesidades de almacenamiento cuando se implementan en procesadores escalares y vectoriales con gran capacidad de almacenamiento. El método se ha implementado en un IBM 3090 con procesador vectorial usando diferentes algoritmos para l...

  8. Evaluacion del factor central y periferico en fatiga muscular

    Directory of Open Access Journals (Sweden)

    Marcela E. Panizza

    1983-09-01

    Full Text Available Se estúdio la fatiga muscular en 13 sujetos normales; para ello, fueron sometidos a un esfuerzo sostenido durante 10 minutos previo y posterior, al cual se realizo la medición de la onda M máxima. Durante el esfuerzo y cada 2 minutos, se obtuvieron cuantificaciones de la frecuencia y duración de las ondas positivas y negativas del EMG. Los resultados, mostraron diferencias significativas de estos valores, en función del tiempo de esfuerzo realizado, mientras que las mediciones de la onda M máxima inicial y final, no fueron diferentes, todo lo cual lleva a jerarquizar el factor central como el más importante en el desarrollo de fatiga, bajo nuestras condiciones de estudio, que son además de sencilla aplicación clínica.

  9. Review on Sons and Lovers

    Institute of Scientific and Technical Information of China (English)

    顾燕君

    2013-01-01

    This essay centralizes on the analysis of the writing skills, the theme and my personal insights of Sons and Lovers, as well as my interpretation of the mother-son relationship in terms of feminism. Overall, hope it will provide a specific perspective of this renowned novel and arouse the readers’attention to interpret the novel themselves.

  10. Modelo de asignación predictivo de longitudes de ondas en redes WDM teniendo en cuenta dispersión residual y tráficos unicast/multicast con QoS

    Directory of Open Access Journals (Sweden)

    Javier Sierra

    2009-01-01

    Full Text Available El tráfico de Internet está en constante crecimiento y con él las aplicaciones del tipo unicast/multicast con diferentes requerimientos de Calidad de Servicio (QoS. Esto es motivo para que las Redes de Transporte Ópticas (OTN deban continuar su evolución hacia redes completamente ópticas (sin conversiones Óptico-Electrónico-Óptico: OEO. S/G Light-tree es una arquitectura de los nodos de las redes all-OTN que permite el optimo enrutamiento y/o manejo de tráficos unicast/multicast empleando el concepto de Traffic Grooming (TG, granularidad de tráfico en un ambiente óptico. Las técnicas de grooming así como los algoritmos de asignación y enrutamiento propuestos hasta el momento no tienen en cuenta los fenómenos que se pueden prestar en la fibra óptica, los cuales atenúan o alteran las diferentes longitudes de onda en las redes WDM (Wavelength Division Multiplexing. La dispersión cromática es un fenómeno que deforma los pulsos transmitidos en una fibra óptica y el efecto depende de la longitud de onda empleada en la transmisión. En este artículo, se propone un modelo predictivo de asignación de longitudes de ondas basado en cadenas de Markov que tiene en cuenta la dispersión residual en redes WDM que soportan traffic grooming y tráficos unicast/multicast con requerimientos de QoS. Los resultados de las simulaciones realizadas muestran que el modelo propuesto mejora la probabilidad de bloqueo de tráficos con requerimientos de QoS.

  11. Hip-Hop Guayaquil: culturas viajeras e identidades locales

    Directory of Open Access Journals (Sweden)

    1999-01-01

    Full Text Available HIP-HOP GUAYAQUIL: CULTURES ITINÉRANTES ET IDENTITES LOCALES. Le hip-hop est un style de musique contemporaine caractérisé par une orchestration d’œuvres lyriques rapées, la superposition de morceaux de musique enregistrés dans le passé par différents artistes, et une instrumentation électronique, tout cela sur des rythmes de basse réguliers et constants. Le hip-hop, musique accompagnée de ses propres danses et de sa mode, est le produit du déplacement et de la transformation d’une variété d’idéologies politiques de la communauté noire qui se constituent à partir de relations qui se modifient entre elles, et en relation avec les cultures dominantes contre lesquelles elles luttent quotidiennement. À l’origine, le hip-hop est lié à des mouvements d’identité de jeunes noirs. Dans cet article, il est intéressant d’étudier le rôle du hip-hop dans la formulation d’une identité entre jeunes métisses et noirs des secteurs populaires de Guayaquil. Cet exemple illustre la nécessité d’inclure dans l’analyse les dimensions politiques des processus de traduction du global au niveau local. El hip-hop es un género de música contemporánea caracterizado por la orquestación de líricas que son rapeadas, superposición de fragmentos de música grabada en el pasado por diferentes artistas, e instrumentación electrónica, todo ello sobre ritmos de bajo regulares y constantes. Como un tipo de música acompañado por sus propias formas de danza y moda, el hip-hop es producto del viaje y la transformación de una variedad de ideologías políticas de la comunidad negra que se constituyen a sí mismas en relaciones cambiantes entre sí y en relación a las culturas dominantes contra las cuales luchan cotidianamente. El hip-hop está ligado, en su contexto originario, a políticas de identidad defendidas por jóvenes negros. Lo que interesa explorar en este artículo es el papel del hip-hop en la formulación de una identidad

  12. A test of the "sexy son" hypothesis: sons of polygynous collared flycatchers do not inherit their fathers' mating status.

    Science.gov (United States)

    Gustafsson, Lars; Qvarnström, Anna

    2006-02-01

    According to the original "sexy son" hypothesis, a female may benefit from pairing with an already-mated male despite a reduction in fecundity because her sons inherit their father's attractiveness. We used data from a long-term study of collared flycatchers (Ficedula albicollis) collected during 24 years to test this prediction. Our results show that the sons of polygynously mated females fledged in poor condition and therefore did not inherit their father's large forehead patch (a condition-dependent display trait) or mating status. From the female's perspective, polygynous pairing resulted in fewer recruited grandchildren than did a monogamous pairing. The reproductive value of sons did not outweigh the fecundity costs of polygyny because the low paternal care reduced the attractiveness of sons. When there are long-lasting parental effects on offspring attractiveness, costs of polygyny may include the production of nonsexy sons.

  13. Análisis de vibraciones producidas por voladuras para la excavación de túneles urbanos

    OpenAIRE

    Alonso Estepa, Luís

    2003-01-01

    La tesina se divide en dos bloques bien diferenciados. Una primera parte en la que se revisan los aspectos teóricos del tema, incluyendo los parámetros de las ondas sísmicas; una clasificación de las mismas; qué parámetros son los más influyentes en la transmisión de vibraciones determinando las especificaciones de los distintos tipos de explosivo, las características geométricas de una voladura y la relación entre tipo de macizo rocoso y la transmisión de las ondas sísmicas; q...

  14. Un viaje desde lo imaginario a lo real. Una aproximación al perfil del turista literario en España

    Directory of Open Access Journals (Sweden)

    Rubén J. Pérez Redondo

    2017-05-01

    Full Text Available Los viajes han sido frecuentemente objeto de inspiración para escritores y cronistas que han ido dejando la huella de su experiencia viajera en el desarrollo de sus textos. En ellos se suele alternar lo real con lo imaginario y es esa una de las principales fortalezas que puede tener un trabajo literario para alcanzar el éxito. La constante intromisión de lo real en lo ficticio y viceversa permite la construcción de incesantes imaginarios sociales en determinados lugares y momentos. Las creaciones literarias transportan al lector a una realidad que sólo existe o se configura en su cabeza. Con el auge y desarrollo del turismo literario, que es una rama del turismo cultural, se va a permitir, de múltiples maneras, que el lector complemente en el mundo real lo que experimentó en sus lecturas, por ejemplo visitando los lugares donde discurre la trama de una novela. En este artículo se va a analizar, por un lado, el turismo literario como factor de creación de nuevos imaginarios sociales y, por otra parte, se va a construir un perfil del turista literario en España que nos permita identificar cuáles son sus características comunes. Para conseguir este fin hemos revisado bibliografía específica sobre el tema tratado, se ha recurrido a organismos culturales que nos han aportado datos sobre el visitante y su experiencia viajera y hemos incorporado una encuesta como técnica para obtener información.      

  15. Influencia de la estimulación sonora binaural en la generación de ondas cerebrales. Estudio electroencefalográfico

    OpenAIRE

    González Velasco, Pedro Miguel

    2013-01-01

    Introducción y objetivos. La audición binaural permite al sistema auditivo realizar un correcto análisis de la información que portan las ondas sonoras al posibilitar la comparación de la señal que llega a cada oído. La relación de ambos lados de la vía auditiva sucede casi desde el inicio de la misma, ya en el tronco cerebral, mediante decusaciones de fibras al lado contralateral de la vía auditiva. De esta manera, la estimulación sonora influye en la actividad del sistema nervioso y, pos...

  16. Frentes de ondas (wavefronts e limites da visão humana Parte 2: aplicações

    Directory of Open Access Journals (Sweden)

    Jankov Mirko

    2002-01-01

    Full Text Available Os valores médios de todos os coeficientes de Zernike são de aproximadamente zero, ao passo que a variabilidade individual é muito grande, o que significa que os seres humanos, como espécie em geral, têm sistema óptico muito bom, mas individualmente imperfeito. Certa instabilidade temporal das aberrações de alta ordem foi descrita em função da acomodação. Este fato leva a uma nova pergunta: a correção de todas as aberrações para visão em estado não acomodado será benéfica para visão de perto também? É possível modificar e diminuir as aberrações ópticas por meio de foto-ablação por "scanning spot LASER" tendo os dados das frentes de ondas como a base para perfil de ablação individualizado. É fundamental a fixação perfeita do feixe de "LASER" em relação ao olho, obtida com os "eye-trackers" de alta freqüência. O benefício visual teórico da correção das aberrações de alta ordem seria de até 12 vezes. A meta principal dos tratamentos guiados pelas frentes de onda é de não permitir a piora da visão depois do tratamento cirúrgico refrativo, como pode ocorrer hoje em dia com os tratamentos tradicionais a "LASER"; em seguida, a meta se es-tenderia aos melhoramentos visuais, bem como ao tratamento dos casos de córneas extremamente irregulares (ablações primárias irregulares, pequenas ou descentradas, a presença das ilhas centrais ou irregularidades após transplante de córnea. O entendimento da terminologia e das bases da nova evolução tecnológica, bem como o constante acompanhamento crítico dos resultados publicados é fundamental para a abordagem moderna dos problemas relativos à refração e à cirurgia refrativa.

  17. Son Preference in Pakistan; A Myth or Reality.

    Science.gov (United States)

    Atif, Khaula; Ullah, Muhammad Zia; Afsheen, Afeera; Naqvi, Syed Abid Hassan; Raja, Zulqarnain Ashraf; Niazi, Saleem Asif

    2016-01-01

    To analyze desire for sons/daughters among ladies of Peshawar, Pakistan, with a view to rule out son preference and to study impact of various demographic characteristics on the subject. Cross-sectional descriptive study conducted at Combined Military Hospital, Peshawar, from August 2015 - January 2016; sampling technique was random/probability/non-purposive. Self-designed questionnaire was utilized; carrying questions pertinent to desire for sons/daughters during marital life, and demographic details. Data analyzed via descriptive analysis (SPSS-21), expressed as frequencies/percentages and mean ± standard deviation(minimum/maximum). Sons and daughters desired (dependent variables) were cross-tabulated with independent variables. Response rate was 63.25% (n-506). Data revealed following: Sons desired 3.05±2.061(1/12); Daughters desired 1.15±0.767(0/4); 6.1%(n-31) and 0.6%(n-3) desired infinite number of sons and daughters respectively, 18.2%(n-92) did not desire to have even one daughter, while 2.2%(n-11) considered it immaterial to have daughters or sons. There was a significant relation between sons desired and client's education (pGender discrimination can be attenuated by adequately addressing son preference at all tiers.

  18. La doble medida en la arquitectura del pasado: El Palacio de Onda y su planta antropométrica

    Directory of Open Access Journals (Sweden)

    Roldán Medina, Francisco Javier

    2015-12-01

    Full Text Available Described in this paper, is the methodological process to reconstruct the modular design of the fortified palace of Onda (Castellon Spain, through its anthropologic plan, and applying the Metrologic Principles unravelled in previous research of the author in this field. Module, axis, size and geometric scheme are identified on the base plan, with digital precision. Different thicknesses of the walls are detected and classified. Verifications are carried out via direct measurements. In this building, the continuous utilization of dynamic modulations are highlighted in the decisive and characteristic geometry of the general floor, as in each of the parts. The variety of the thickness of the walls, the displacements of the axis and the correct tracing of the fortress, also stand out. The knowledge of a common system of proportions used in the past could represent a new paradigm in the study and the conservation of our historical and cultural heritage.Se describe en este artículo el proceso metodológico para reconstruir el diseño modular del palacio fortificado de Onda (Castellón a partir de su planta arqueológica, aplicando los principios metrológicos desentrañados en las investigaciones previas del autor en este campo. Módulo, ejes, tamaños y esquema geométrico general quedan identificados sobre la planta base con precisión digital. Se clasifican los diferentes espesores de muros detectados. Se realizan comprobaciones mediante mediciones directas. En esta obra resalta la continua utilización de modulaciones dinámicas, tanto en la rotunda y caracterizadora geometría de su planta general, como en cada una de las partes. Destaca también la variedad de espesores de muro, los desplazamientos de ejes, y el correcto replanteo de la fortaleza. El conocimiento de un sistema común de proporciones en los usos del pasado puede representar un nuevo paradigma en el estudio y conservación de nuestro patrimonio histórico y cultural.

  19. Combinación de pantallas de cristal líquido para la modulación compleja de frentes de onda. Aplicación en reconstrucción de hologramas de Fresnel digitales.

    OpenAIRE

    Tudela Fernández, Raúl; Martín Badosa, Estela; Labastida i Juan, Ignasi, 1970-; Vallmitjana i Rico, Santiago; Carnicer González, Arturo

    2012-01-01

    En este trabajo se presentan distintas alternativas para obtener la modulación compleja completa de frentes de onda mediante la suma de la modulación introducida por dos pantallas de cristal líquido. Para los distintos métodos se presentan resultados simulados de reconstrucciones de hologramas de Fresnel digitales.

  20. Preliminary results of a high-resolution refractometer using the Hartmann-Shack wave-front sensor: part I Resultados preliminares com refratrômetro de alta resolução, usando sensor de frente de onda de Hartmann-Shack: parte I

    Directory of Open Access Journals (Sweden)

    Luis Alberto Carvalho

    2003-06-01

    Full Text Available In this project we are developing an instrument for measuring the wave-front aberrations of the human eye using the Hartmann-Shack sensor. A laser source is directed towards the eye and its diffuse reflection at the retina generates an approximately spherical wave-front inside the eye. This wave-front travels through the different components of the eye (vitreous humor, lens, aqueous humor, and cornea and then leaves the eye carrying information about the aberrations caused by these components. Outside the eye there is an optical system composed of an array of microlenses and a CCD camera. The wave-front hits the microlens array and forms a pattern of spots at the CCD plane. Image processing algorithms detect the center of mass of each spot and this information is used to calculate the exact wave-front surface using least squares approximation by Zernike polynomials. We describe here the details of the first phase of this project, i. e., the construction of the first generation of prototype instruments and preliminary results for an artificial eye calibrated with different ametropias, i. e., myopia, hyperopia and astigmatism.Neste projeto estamos desenvolvendo instrumento para medidas das aberrações de frente de onda do olho humano usando um sensor Hartmann-Shack. Uma fonte de luz laser é direcionada ao olho e sua reflexão difusa na retina gera frente de onda aproximadamente esférica dentro do olho. Esta frente de onda atravessa os diferentes componentes do olho (humor vítreo, lente, humor aquoso e córnea trazendo informações sobre as aberrações ópticas causadas por estes componentes. No meio externo ao olho existe sistema óptico formado por uma matriz de microlentes e uma câmera CCD. A frente de onda incide nesta matriz e forma um padrão aproximadamente matricial de "spots" no plano do CCD. Algoritmos de processamento de imagens são utilizados para detectar os centróides de cada "spot" e esta informação é utilizada para

  1. Aplicación de la Ecuación de Desviación de Geodésicas a la Detección de Ondas Gravitacionales

    OpenAIRE

    Champo Jiménez, Omar

    2012-01-01

    La Relatividad General es uno de los más grandes desarrollos científicos de la humanidad. Esta teoría fue propuesta por el Dr. Albert Einstein a principios del siglo pasado y ha superado la mayor ́de las pruebas experimetales a las que ha sido sometida. Una ultima prueba es la demostración directa de la existencia de las llamadas ondas gravitacionales, tema que es la principal motivación de este trabajo de tesis. Es por eso que en este trabajo de tesis, haremos una revisión ...

  2. Development of neutronic models with KANEXT for a reactor of traveling wave; Desarrollo de modelos neutronicos con KANEXT para un reactor de onda viajera

    Energy Technology Data Exchange (ETDEWEB)

    Lopez S, R. C.; Francois L, J. L. [UNAM, Facultad de Ingeniera, Departamento de Sistemas Energeticos, Paseo Cuauhnahuac No. 8532, Col. Progreso, 62550 Jiutepec, Morelos (Mexico); Becker, M., E-mail: rcarlosls@yahoo.com.mx [Institut fur Neutronenphysik und Reaktortechnik (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen (Germany)

    2012-10-15

    Problems with the computation time in a based code on the Monte Carlo method, they conduct to explore the option of the deterministic codes to be able to develop a model of robust reactor of traveling wave, and where short term results are obtained to carry out experimentation work to the moment to study an assemblies exchange scheme as method of fuel administration. KANEXT is a versatile and reliable code, developed in Germany that has satisfied our development necessities until the moment. In this article is described the KANEXT operation, and like it was implemented to develop a preliminary model of reactor core of traveling wave with operation way of stationary wave. The results obtained until the moment, as for the neutrons multiplication factor and the isotopic balance, are encouraging and they lead to refine the model removing completely the axial covering. The adoption of deterministic codes has allowed carrying out tests of complete core in a conventional computer in question of only hours; this will be valuable in the next stage of the research, where developing a re situate scheme of fuel assemblies will involve a great quantity of sprints. (Author)

  3. Desempenho de modelos de calibração de guias de onda acopladas a TDR e a multiplexadores em três tipos de solos Performance of calibration models for TDR and multiplexer - connected waveguides in three soil types

    Directory of Open Access Journals (Sweden)

    Eugenio Ferreira Coelho

    2006-02-01

    Full Text Available O trabalho teve como objetivo avaliar modelos de calibração para dois tipos de guias de onda de TDR, referentes a dois equipamentos (Trase System e TDR 100, acopladas diretamente ao analisador de umidade ou a multiplexadores. Amostras de três tipos de solo foram acondicionadas em segmentos de tubos de PVC e saturadas. Dois tipos de guias de onda de três hastes, com capacitor e com resistor foram inseridas dentro de cada segmento de tubo com solo e conectadas a dois equipamentos de TDR, diretamente no testador de cabos ou via multiplexadores. Dados de umidade obtidos por gravimetria e da constante dielétrica foram tomados em cada coluna durante a secagem do solo da saturação até umidades próximas do limite inferior de disponibilidade de água por meio de leituras com as guias de onda conectadas ao testador de cabos e conectadas ao multiplexador. Um modelo polinomial cúbico foi ajustado aos dados da constante dielétrica do solo (épsilon e da correspondente umidade (teta e cinco modelos de determinação de q em função de e foram testados quanto ao desempenho. Os resultados mostraram que não houve diferença significativa na calibração das guias de onda com capacitor para uso com a TDR Trase System, considerando a conexão das guias ao analisador de umidade ou a multiplexadores. No caso da TDR 100, as guias de onda com resistor devem ser calibradas conforme o seu uso. O modelo cúbico foi o de melhor desempenho seguido pelo modelo de Roth que estimou, com boa exatidão, os valores da constante dielétrica e da umidade com a mais próximo de 0,5 para as guias de onda com capacitor que com as guias com resistor.The study aimed at evaluating of calibration models for two kinds of TDR waveguides used with Trase System and TDR 100 equipments linked to the cable tester or the multiplexer. Disturbed samples of three soils were packed in PVC columns and, after soil saturation, two TDR waveguides of three rods with capacitor and with

  4. Sexual Orientation of Adult Sons of Gay Fathers.

    Science.gov (United States)

    Bailey, J. Michael; And Others

    1995-01-01

    Examined the sexual orientation of 82 adult sons of 55 gay men. Found that more than 90% of the sons whose sexual orientation could be rated were heterosexual. Gay and heterosexual sons did not differ on potentially relevant variables such as length of time they had lived with their fathers. (MDM)

  5. Son Preference and Its Consequences (A Review) | Shah | Gender ...

    African Journals Online (AJOL)

    Cultural preference for sons was evident from that fact that in Hindu\\'s traditions, ... A common perception of son\\'s preference on daughter was the ascribed ability of ... against females in the allocation of food and health care within the household. ... their-self in most of the south Asian countries preferred sons to daughters.

  6. Sistema de adquisición de onda cerebral mediante electrodos secos y comunicación inalámbrica: aplicación a detección de somnolencia

    OpenAIRE

    Vilatuña Canchigña, Betty Janneth; Yanchaliquín Guamán, Vanessa Jaqueline; Álvarez Rueda, Robin

    2007-01-01

    Este proyecto esta orientado a solucionar el problema de somnolencia en conductores de vehículos procurando disminuir los accidentes de tránsito, para lo cual se construyó un equipo instrumental que capta las ondas cerebrales emitiendo una señal de alerta oportuna cuando se detecta adormecimiento. Para conseguir este objetivo se trabaja con la señal de electroencefalograma (EEG), el cual se mide como una diferencia de voltaje entre dos electrodos. Esta señal biológica...

  7. Ondas lineales barotrópicas en la atmósfera tropical y el litoral ecuatoriano-colombiano

    Directory of Open Access Journals (Sweden)

    1998-01-01

    ósfera. Se obtuvieron dos modos predominantes en la atmósfera tropical: la oscilación de 37 días con muy alta coherencia y muy próxima a la oscilación de Madden y Julian (1972, y una segunda oscilación de 17 días de alta coherencia, de características muy similares a la onda Kelvin ecuatorial detectada en el Pacífico central, Wunsh y Gill (1976. En el océano fueron detectadas un modo de 14,7 días con alta coherencia y gran energía en el espectro correspondiente probablemente a la componente de mareas lunisolar quincenal, y una oscilación de 9 días que sugiere características de una onda Kelvin ecuatorial del primer período baroclínico de 9 días, similar a la mencionada por Wallace (1971. Se detectó en los espectros de temperatura superficial del mar la presencia de oscilaciones que podrían tener naturaleza de ondas internas con períodos de 30, 18,5 y 10 días. Fueron caracterizadas las ondas estacionales predominantes, determinándose los niveles más altos de energía en la estación húmeda. LINEAR BAROTROPIC WAVES IN THE TROPICAL ATMOSPHERE AND ON THE EQUATORIAN-COLUMBIAN COAST. Using time series of daily averages of atmospheric pressure, environmental temperature, superficial temperature and mean sea level during 1994-1995 in five stations from Ecuador, Colombia and one station in the Galápagos Islands (Ecuador techniques of spectral analysis were applied in order to determine the existent oscillations in the ocean and the atmosphere. They were given two predominant modes in the tropical atmosphere: the oscillation of 37 days with high levels of coherence, very close to the oscillation of Madden and Julian (1972 and a second oscillation of 17 days with high coherence, of characteristic very similar to the Kelvin Equatorial wave detected in the central Pacific (Wunsh and Gill, 1976. In the ocean were detected: a mode of 14.7 days with high coherence and great energy in the spectra associated to the biweekly moon component. Finally an oscillation of 9

  8. Relatividad galileana y ondas mecánicas

    OpenAIRE

    Londoño Vega, Mario Felipe

    1991-01-01

    Las leyes de la mecánica son las mismas para todos los observadores inerciales, observadores que se mueven con velocidad constante unos respecto a otros. Así lo asevera el principio de la relatividad galileana ( o Newtoniana). Los diversos observadores correlacionan su observación mediante las transformaciones galileana y así, cuando en la expresión de una ley de la mecánica efectuamos una de tales transformaciones, la ley no cambia, su forma permanece inalterada: decimos que es invariante b...

  9. Desvulcanização do resíduo de terpolímero de etileno-propileno-dieno (EPDM-r por micro-ondas Devulcanization of ethylene-propylene-diene polymer residues (EPDM-r by microwaves

    Directory of Open Access Journals (Sweden)

    Vinicius Pistor

    2010-09-01

    Full Text Available Elastômeros vulcanizados são materiais comumente empregados em diversas aplicações, como nas indústrias automotiva e calçadista. Neste trabalho, aparas do terpolímero de etileno-propileno-dieno (EPDM-r provenientes da indústria automotiva foram submetidas a micro-ondas durante diferentes tempos de exposição (2-5 min. Após a desvulcanização, as amostras foram caracterizadas por teor de gel, calorimetria exploratória diferencial (DSC e energias de ativação de degradação (Ea determinadas por análise termogravimétrica (TGA. O comportamento de degradação apresentou composição do EPDM-r condizente com a literatura. A análise de teor de gel demonstrou que o EPDM-r foi desvulcanizado quando exposto às micro-ondas por 5 minutos. As análises de DSC não indicaram modificações significativas nas amostras estudadas, e o estudo de Ea mostrou que os aditivos encontrados na composição do EPDM-r influenciam na eficiência do método de regeneração por micro-ondas.Vulcanized elastomers are materials commonly used in several applications, such as automotive and footwear industries. In this study, scraps of ethylene-propylene-diene terpolymer (EPDM-r from the automotive industry were exposed to microwaves during different periods (2-5 min. After devulcanization, the samples were characterized by gel content, differential scanning calorimetry (DSC and activation energy of degradation (Ea determined by thermogravimetric analysis (TGA. The degradation behavior of EPDM-r was consistent with the literature. The gel content analysis showed that the EPDM-r was devulcanized only at 5 minutes of exposure to the microwaves. DSC analysis demonstrated no significant changes in the samples, and the Ea results confirmed that the additives found in the composition of the EPDM-r affect the efficiency of the regeneration method.

  10. ¿Son los obreros idiotas e irracionales?

    Directory of Open Access Journals (Sweden)

    Francisco José León

    2010-01-01

    Full Text Available En este artículo presentamos un análisis crítico de la aproximación posmoderna y posestructuralista a la cuestión de la subjetividad obrera. El examen evidencia que: a algunas de sus proposiciones explicativas son internamente contradictorias o lógicamente inconsistentes; b en otras ocasiones la contradicción se produce entre las distintas proposiciones que la teoría ofrece para explicar un mismo fenómeno; c son frecuentes las contradicciones entre las proposiciones explicativas y los principios teóricos de los que se derivan; d es común la falta de inteligibilidad de las proposiciones; e abundan los "agujeros negros" en las cadenas de acontecimientos que se presentan como previos a la producción del efecto que pretenden explicar, y f muchas de sus proposiciones o bien no son plausibles empíricamente o simplemente no son empíricamente testables. Atribuimos a estas deficiencias la responsabilidad del fracaso de los autores posmodernos en su intento por recuperar la agencia obrera en los estudios del proceso de trabajo.

  11. Avaliação económica de um investimento em geração de energia das ondas e energia solar térmica

    OpenAIRE

    Nunes, Ruben Fernando Lopes

    2012-01-01

    O presente trabalho tem como objectivo efectuar a avaliação económica e determinar a viabilidade com e sem os incentivos fiscais de duas tecnologias de conversão de duas fontes distinta e emergentes de energia renovável, o Concentrador Cilindro-parabólico e a Torre Solar para a energia solar termoeléctrica e a Coluna de Água Oscilante e o Pelamis para a energia das ondas. Realiza-se uma curta abordagem à energia Solar e à energia dos Oceanos, e às tecnologias existentes para estes tipos de en...

  12. Resultados de la terapia por onda de choque focal en calcificaciones del manguito rotador. [Results of focal shock-wave therapy for calcifyng tendinitis of the rotatorr cuff

    Directory of Open Access Journals (Sweden)

    Daniel Moya

    2013-01-01

    Full Text Available Introducción El objetivo del presente trabajo es evaluar, en forma prospectiva, los resultados del tratamiento mediante la aplicación de ondas de choque focales, en un grupo de pacientes con calcificaciones sintomáticas del manguito rotador. Material y métodos Se incluyeron 44 casos consecutivos de calcificaciones localizadas en alguno de los tendones del manguito rotador, en 43 pacientes con cirugías fallidas o tratamiento previo, al menos, por 6 meses, con síntomas persistentes. Resultados En la evaluación al año, la calcificación había desaparecido completamente en 20 pacientes (45,5%. En 13 casos (29,5%, hubo un cambio significativo en el tamaño o la densidad. En 11 casos (25%, no hubo modificaciones. El dolor, según la escala analógica visual descendió de un promedio de 5,5 a 1,4 (p <0,0001. El puntaje de UCLA pasó de un valor inicial promedio de 15,7 a un valor de 29,3 (p <0,0001. El puntaje de Autoevaluación ASES fue de 84,6 comparado con un valor inicial de 48 (p <0,0001. El 77% de los pacientes estuvieron satisfechos con el procedimiento. Conclusión El estudio sugiere que la terapia por onda de choque es una alternativa válida para pacientes que no han respondido al tratamiento conservador ni al quirúrgico

  13. Male-mediated infertility in sons of building painters and gardeners

    DEFF Research Database (Denmark)

    Ramlau-Hansen, C H; Stoltenberg, C D G; Hougaard, K S

    2012-01-01

    To investigate whether sons of gardeners and building painters have increased risk of infertility in comparison with sons of bricklayers, carpenters and electricians.......To investigate whether sons of gardeners and building painters have increased risk of infertility in comparison with sons of bricklayers, carpenters and electricians....

  14. Síntese do polipirrol com surfactantes aniônicos visando aplicações como absorvedores de micro-ondas

    Directory of Open Access Journals (Sweden)

    Regiane Aparecida Medeiros Campos

    2014-06-01

    Full Text Available Neste trabalho diferentes amostras de polipirrol (PPi foram sintetizadas variando a combinação dos oxidantes FeCl3 e Fe2(SO43 e dos surfactantes docecilbenzenosulfonato de sódio (DBSNa e ácido dodecilbenzenosulfônico (DBSA. Análises por espectroscopia na região do infravermelho não apresentam diferenças significativas na estrutura química das amostras de PPi sintetizadas. No entanto, análises termogravimétricas, de condutividade elétrica e de difração de raios X mostram que os surfactantes aniônicos favorecem a obtenção de amostras mais estáveis termicamente, condutoras e ordenadas cristalograficamente. Medidas de refletividade de blendas de PPi com resina epóxi, na faixa de 8 a 12 GHz, mostram valores de atenuação de micro-ondas de até 95% da radiação incidente.

  15. Son preference in rural China: patrilineal families and socioeconomic change.

    Science.gov (United States)

    Murphy, Rachel; Tao, Ran; Lu, Xi

    2011-01-01

    This article draws on a survey conducted in six provinces in summer 2008 to investigate the determinants of son preference in rural China. The analysis confirms the conventional wisdom that son preference is embedded within patrilineal family structures and practices. We extend our analysis by exploring specific aspects of variation within patrilineal family culture. We find that the patrilineal group (clan) composition of villages and family participation in practices such as building ancestral halls and updating genealogies significantly influence son preference. Yet even though son preference is embedded within patrilineal family culture, our analysis suggests that over time the attenuation of son preference is likely. This is because determinants associated with socioeconomic change—for instance, higher levels of education, direct exposure to official policy education materials, higher income (a proxy for rural industrialization), and agricultural mechanization—all attenuate son preference. Being younger and female are also associated with weaker son preference, and both characteristics are likely to interact with education and industrialization to further dilute son preference in the longer term. Nevertheless, our findings suggest that concerted efforts are needed to ameliorate institutional discrimination against rural people in welfare provisioning and in labor markets, and to promote multiple dimensions of gender equality, including in land rights, wage rates, and education.

  16. SO(N) reformulated link invariants from topological strings

    International Nuclear Information System (INIS)

    Borhade, Pravina; Ramadevi, P.

    2005-01-01

    Large N duality conjecture between U(N) Chern-Simons gauge theory on S 3 and A-model topological string theory on the resolved conifold was verified at the level of partition function and Wilson loop observables. As a consequence, the conjectured form for the expectation value of the topological operators in A-model string theory led to a reformulation of link invariants in U(N) Chern-Simons theory giving new polynomial invariants whose integer coefficients could be given a topological meaning. We show that the A-model topological operator involving SO(N) holonomy leads to a reformulation of link invariants in SO(N) Chern-Simons theory. Surprisingly, the SO(N) reformulated invariants also has a similar form with integer coefficients. The topological meaning of the integer coefficients needs to be explored from the duality conjecture relating SO(N) Chern-Simons theory to A-model closed string theory on orientifold of the resolved conifold background

  17. A terceira onda sexológica: medicina sexual e farmacologização da sexualidade

    Directory of Open Access Journals (Sweden)

    Jane A. Russo

    Full Text Available Este artigo pretende discutir a passagem da "segunda onda sexológica", que surge em meados do século XX, para uma terceira fase representada pela Medicina Sexual, cujo surgimento data da última década do século. Analisa-se o surgimento da Medicina Sexual como parte de um processo mais amplo de "biologização" das concepções acerca do humano ao qual se concatena uma transformação importante do modo de atuação e produção da indústria farmacêutica. Dois pontos cruciais na passagem da segunda sexologia para a Medicina Sexual serão abordados: a reconfiguração médica da impotência através da construção e da difusão do diagnóstico de "disfunção erétil" e os efeitos disto para a sexualidade masculina; a mudança de foco da sexualidade feminina ou do casal para a sexualidade masculina e suas consequências. O objetivo mais amplo do artigo é apresentar e discutir a medicalização da sexualidade masculina e seu significado no que diz respeito às relações de gênero.

  18. Son preference in a rural village in North Vietnam.

    Science.gov (United States)

    Bélanger, Danièle

    2002-12-01

    This article explores the continuing preference for sons in the context of low fertility in Vietnam. Although the total fertility rate for Vietnam declined from 6.0 children per woman of reproductive age in 1979 to 2.2 children in 1998, demographic evidence shows that son preference remains strong and influences contraceptive and fertility behavior. This study examines the underlying factors for son preference in a rural village in North Vietnam. The methodology includes focus-group discussions, an in-depth study of 25 families, and ethnographic observation. Results indicate that sons are highly desired for their social, symbolic, and economic value. In spite of four decades of socialist policies aimed at reducing gender-based inequalities and at weakening the patriarchal kinship system, the desire for sons continues to drive the family-building process. The article also indicates a gap between discourse and social practice with respect to roles assigned to children on the basis of their sex.

  19. Experiencia en Cuba del tratamiento de la litiasis renoureteral con litotricia extracorpórea por ondas de choque en niños

    Directory of Open Access Journals (Sweden)

    María Victoria Labrada Rodríguez

    2012-06-01

    Full Text Available Introducción: la litiasis urinaria en el niño resulta una enfermedad poco frecuente si se compara con su incidencia en el adulto. Objetivos: describir el resultado del tratamiento en Cuba de la litiasis del aparato urinario en niños, mediante la litotricia extracorpórea por ondas de choque, así como validar la eficacia del método. Métodos: la muestra corresponde a 227 niños, tratados en el Centro de Tratamiento de la Litiasis Urinaria del Hospital Clinicoquirúrgico "Hermanos Ameijeiras'' de La Habana, entre abril de 1986 y octubre de 2011, utilizando 3 tipos de litotritores: el HM3 (Dornier, Lithostar Plus (Siemens y Medical Modulith® SLX (Storz. Resultados: las edades límites fueron 2 y 18 años. De manera general resultó similar el total de pacientes tratados del sexo femenino que el masculino (51 %/49 %. El síntoma predominante fue el cólico nefrítico con cálculos renales (81,9 %, y en el uréter (18,1 %. La superficie media fue de 1,20 cm². Se utilizó anestesia general orotraqueal (34,4 % y general intravenosa (65,6 %. Los retratamientos fueron necesarios en 8 casos (3,52 %. Las complicaciones fueron la infección urinaria aguda (3,08 % y el hematoma subcapsular renal (0,88 %. Resultó libre de material litiásico el 96,04 %. Conclusiones: la terapéutica mediante la litotricia extracorpórea por ondas de choque resulta efectiva, con baja tasa de morbilidad y de complicaciones graves, por lo que creemos debe defenderse científicamente como la primera opción terapéutica en la resolución de la litiasis urinaria en estas edades. Debe recordarse que eliminar el cálculo no es suficiente, hay que identificar la enfermedad, su tratamiento de fondo, y evitar las recidivas.

  20. Cuidados invisibles: ¿son suficientemente reconocidos?

    Directory of Open Access Journals (Sweden)

    Rosanna de la Rosa Eduardo

    Full Text Available Los cuidados invisibles son un elemento central y fundamental de la práctica de la Enfermería y son la base de su identidad profesional. La Enfermería ha sufrido un importante y positivo proceso de profesionalización en los últimos 150 años, sin embargo, los cuidados invisibles siguen siendo poco reconocidos, a pesar de su importancia en la recuperación y en la calidad de vida de los usuarios. En este trabajo se analizan brevemente las grandes transformaciones sociales actuales que obligan a replantearse la necesidad de visibilizar los cuidados invisibles, se plantean interrogantes clave para abordar esta discusión y se proponen una serie de acciones concretas para avanzar en este reconocimiento.

  1. Maternal pre-pregnancy body mass index and pubertal development among sons

    DEFF Research Database (Denmark)

    Hounsgaard, M L; Håkonsen, L B; Vested, A

    2014-01-01

    Maternal overweight and obesity in pregnancy has been associated with earlier age of menarche in daughters as well as reduced semen quality in sons. We aimed at investigating pubertal development in sons born by mothers with a high body mass index (BMI). The study included 2522 sons of mothers...... indicators of pubertal development, results also indicated earlier pubertal development among sons of obese mothers. After excluding sons of underweight mothers in a subanalysis, we observed an inverse trend between maternal pre-pregnancy BMI and age at regular shaving, acne and first nocturnal emission....... In conclusion, maternal pre-pregnant obesity may be related to earlier timing of pubertal milestones among sons. More research, preferably based on prospectively collected information about pubertal development, is needed to draw firm conclusions....

  2. Interferencia de ondas acústicas en la calibración primaria de micrófonos por reciprocidad en campo libre

    DEFF Research Database (Denmark)

    Barrera Figueroa, Salvador; Rasmussen, Knud; Jacobsen, Finn

    2004-01-01

    La calibración primaria de micrófonos se realiza empleando el método de reciprocidad, que implica el uso de tres micrófonos que se miden de dos en dos. Uno de los micrófonos en cada pareja actúa como emisor de ondas acústicas y otro como receptor. Se trata de transductores recíprocos. Este método...... se puede aplicar utilizando un acoplador donde se introducen los micrófonos (calibración en presión) o en un ambiente acústico anecoico (calibración en campo libre). En este último caso, el que nos ocupa, la suposición de que los micrófonos actúan como fuentes sonoras puntuales implica que el efecto...... eliminación de estas reflexiones por filtrado de los resultados de medición en el dominio del tiempo. Adicionalmente se presentan algunas simulaciones numéricas que ilustran el fenómeno....

  3. On Some Unusual Properties of Wave Solutions of Free Maxwell Equations

    Directory of Open Access Journals (Sweden)

    Augusto Espinoza

    2006-01-01

    Full Text Available Se descubren algunas propiedades inusuales de las soluciones de las llamadas ecuaciones libres de Maxwell. Mostramos la existencia de soluciones que representan las ondas electromagnéticas en el vacío para los cuales el vector de Poynting no coincide con el vector de Umov. Se presentan soluciones que corresponden a ondas magnéticas estacionarias de una configuración inusual en el vacío, que describen en el vacio formaciones estables anulares y esféricas de campo. Se demuestra que en el vacío, de acuerdo a las soluciones obtenidas el campo eléctrico E puede ser un vector polar así como un vector axial; y el campo magnético B, en su turno, puede ser un vector axial así como también un vector polar. Se muestra que tales soluciones existen cuando los vectores E y B, no son vectores polares ni axiales. Además, estas soluciones corresponden a ondas electromagnéticas que no transfieren energía ni momentos en cualquier punto del vacío.

  4. The discovery and exploration of Hang Son Doong

    Energy Technology Data Exchange (ETDEWEB)

    Limbert, H.; Limbert, D.; Hieu, N.; Phai, V. V.; Kinh Bac, D.; Phuong, T. H.; Granger, D.

    2016-08-01

    Hang Son Doong is located in the Phong Nha Ke Bang Limestone Massif in Quang Binh Province, Central Vietnam. Cave exploration by British cavers has been continuous in this area since 1990. Hang Son Doong is part of the Phong Nha Cave system which runs from the southern end of the National Park near the Lao border to the final resurgence at Phong Nha Cave. (Author)

  5. Father-Son Inter-Generational Transmission of Authoritarian Paternal Attitudes.

    Science.gov (United States)

    Peretti, Peter O.; Statum, Jo Ann

    1984-01-01

    Attempted to determine authoritarian paternal attitude inter-generational transmission in fathers and sons (N=75). Results suggested that authoritarian paternal attitudes could be indicated in terms of five factors: Dominant, Rigidity, Conformity, Intolerant, and Uncreative; and that the sons expressed strongly the authoritarian attitudes of their…

  6. The Transmission of Parenting from Fathers to Sons

    Science.gov (United States)

    Hofferth, Sandra L.; Pleck, Joseph H.; Vesely, Colleen K.

    2012-01-01

    SYNOPSIS Objective We address the extent to which parenting practices of fathers and mothers are associated with their sons’ parenting behaviors as young adults and whether adolescent behavior explains this association. Design Data come from 409 young men interviewed in the 2006 Young Adult study of the 1979 National Longitudinal Survey of Youth. Results Men whose fathers were positively involved with them when growing up report more positive parenting of their own children, a direct effect. Less harsh mothering and more positive fathering are associated with reduced adolescent behavior problems, and positive mothering is associated with positive adjustment of these young men as adolescents. However, neither adolescent problem behavior nor positive adjustment is associated with young men’s fathering of their own children, and thus does not explain the association between the fathering young men received and their own fathering behavior. Conclusions Men’s parenting of their sons can have a long-term direct effect on how their sons parent their own children. Although parenting is associated with both positive and negative behaviors of sons during adolescence, these adolescent behaviors are not directly linked to later parenting behavior when sons have their own children. More research is needed to examine mediation mechanisms for the intergenerational transmission of parenting. PMID:23284271

  7. Parent-son decision-making about human papillomavirus vaccination: a qualitative analysis

    Directory of Open Access Journals (Sweden)

    Alexander Andreia B

    2012-12-01

    Full Text Available Abstract Background Licensed for use in males in 2009, Human Papillomavirus (HPV vaccination rates in adolescent males are extremely low. Literature on HPV vaccination focuses on females, adult males, or parents of adolescent males, without including adolescent males or the dynamics of the parent-son interaction that may influence vaccine decision-making. The purpose of this paper is to examine the decision-making process of parent-son dyads when deciding whether or not to get vaccinated against HPV. Methods Twenty-one adolescent males (ages 13–17, with no previous HPV vaccination, and their parents/guardians were recruited from adolescent primary care clinics serving low to middle income families in a large Midwestern city. Dyad members participated in separate semi-structured interviews assessing the relative role of the parent and son in the decision regarding HPV vaccination. Interviews were recorded, transcribed, and coded using inductive content analysis. Results Parents and sons focused on protection as a reason for vaccination; parents felt a need to protect their child, while sons wanted to protect their own health. Parents and sons commonly misinterpreted the information about the vaccine. Sons were concerned about an injection in the penis, while some parents and sons thought the vaccine would protect them against other sexually transmitted infections including Herpes, Gonorrhea, and HIV. Parents and sons recalled that the vaccine prevented genital warts rather than cancer. The vaccine decision-making process was rapid and dynamic, including an initial reaction to the recommendation for HPV vaccine, discussion between parent and son, and the final vaccine decision. Provider input was weighed in instances of initial disagreement. Many boys felt that this was the first health care decision that they had been involved in. Dyads which reported shared decision-making were more likely to openly communicate about sexual issues than those

  8. Wavefront-guided refractive surgery results of training-surgeons Resultados das cirurgias refrativas guiadas por frentes de ondas de cirurgiões em treinamento

    Directory of Open Access Journals (Sweden)

    Iane Stillitano

    2010-08-01

    Full Text Available PURPOSE: To assess clinical outcomes and changes on higher-order aberrations (HOA after wavefront-guided laser in situ keratomileusis (LASIK and photorefractive keratectomy (PRK for correction of myopia and myopic astigmatism performed by training-surgeons. METHODS: One hundred and seventy patients had customized LASIK (207 eyes and PRK (103 eyes performed by surgeons in-training using the LADARVision 4000 (Alcon, Fort Worth, TX. Preoperative and 1, 3, 6 and 12 months postoperative data of spherical equivalent (SE, best spectacle-corrected visual acuity (BSCVA and uncorrected visual acuity (UCVA were analysed. Wavefront changes were determined using the LADARWave Hartmann-Shack wavefront aberrometer and the pupil size was scaled for 6.5 mm. RESULTS: The mean SE in the LASIK group was -3.04 ±1.07 D and in the PRK group was -1.60 ± 0.59 D. At 1-year follow-up, (80.6% (LASIK and (66.7% (PRK were within ± 0.50 D of the intended refraction. The UCVA was 20/20 or better in (58.1% (LASIK and (66.7% (PRK of the operated eyes. A statistically significant positive correlation was found between achieved versus attempted refractive correction in both groups: LASIK (r=0.975, POBJETIVO: Avaliar os resultados clínicos e mudanças nas aberrações de alta-ordem (HOA, após ceratomileuse assistida por excimer laser in situ (LASIK e ceratectomia fotorrefrativa (PRK guiados por frentes de onda para correção da miopia e astigmatismo miópico realizada por cirurgiões em treinamento. MÉTODOS: Estudo prospectivo de 170 pacientes submetidos a LASIK personalizado (207 olhos e PRK (103 olhos realizados por cirurgiões em treinamento utilizando o LADARVision 4000 (Alcon, Fort Worth, TX. Dados do equivalente esférico (SE, melhor acuidade visual corrigida (BSCVA e acuidade visual não corrigida (UCVA foram analisados no pré-operatório e com 1, 3, 6 e 12 meses de pós-operatório. As alterações de frentes de onda foram determinadas usando o aberrômetro Hartmann

  9. Análise comparativa entre a refração clínica subjetiva e a automatizada obtida por sensor de frentes de onda Comparative analyses between clinical refraction and automatic refraction obtained through a wave front sensor

    Directory of Open Access Journals (Sweden)

    Wilson de Freitas

    2007-08-01

    Full Text Available OBJETIVO: Avaliar e comparar os resultados obtidos da refração estática clínica com a obtida por sensor de frentes de onda. MÉTODOS: Estudo prospectivo, não seqüencial, de 279 olhos de 147 pacientes. Todos os pacientes foram examinados sob cicloplegia. Primeiro realizamos a refração clínica e a seguir a automatizada por sensor de frentes de onda. Os dados refracionais obtidos foram decompostos para análise vetorial. Foram analisados separadamente os dados de um olho por paciente e dos dois olhos. RESULTADOS: A diferença entre a refração clínica e a automatizada foi de -0,19 DE combinada com -0,06 DC no eixo de 15º para os dados de um olho por paciente e -0,17 DE combinada com -0,05 DC no eixo de 3º para todos os olhos da amostra. CONCLUSÃO: Os dados da refração clínica são comparáveis com os da refração obtida por um sensor de frentes de onda.PURPOSE: To evaluate and compare refractive errors obtained through clinical subjective and automatized wavefront refraction analyses in eyes under cycloplegia. METHODS: Prospective study of 147 patients, 279 eyes, undergoing preoperative examination for refractive surgery. Clinical subjective refraction was performed first followed by wavefront refraction. Results on astigmatism obtained from refraction were decomposed in power vectors for statistical analyses. Data were first analyzed in one eye and then in both eyes. RESULTS: The mean difference between clinical subjective refraction and automatized wavefront refraction on cycloplegic eyes was of -0.19 SD combined with -0.06 CD in the 15º axis for data in one eye, and -0.17 SD combined with -0.05 CD in the 3º axis for data in both eyes of the same patient. CONCLUSION: In the present study clinical subjective refraction and automatized wavefront refraction under cycloplegia had similar numerical values.

  10. Efeito das dimensões da seção transversal e da frequência do transdutor na velocidade de propagação de ondas de ultra-som na madeira Effect of the transversal section dimensions and transducer frequency on ultrasound wave propagation velocity in wood

    Directory of Open Access Journals (Sweden)

    Alex Julio Trinca

    2009-02-01

    Full Text Available Diversas pesquisas vêm sendo realizadas com o uso da velocidade de propagação de ondas de ultra-som como parâmetro para estimar propriedades mecânicas da madeira. Tendo em vista que essa velocidade pode ser influenciada pela forma da peça ensaiada, bem como pela frequência do transdutor utilizado no ensaio, conhecer essas fontes de influência é fator importante para a obtenção de resultados confiáveis. Durante estudo mais amplo sobre a influência da dimensão do corpo-de-prova em ensaios destrutivos de compressão paralela às fibras, os corpos-de-prova de 0,03 x 0,03 x 0,09 m e de 0,05 x 0,05 x 0,15 m foram também utilizados para avaliar a variação da velocidade de propagação de ondas de ultrassom em razão da dimensão da peça ensaiada. Para a avaliação da influência da frequência, os ensaios foram realizados com transdutores de onda longitudinal (compressão de 25 kHz, 45 kHz, 80 kHz, 100 kHz, 500 kHz e 1 MHz, em 119 corpos-de-prova de Pinus elliottii e 244 de Eucalyptus grandis. Os resultados indicaram que, em ambas as espécies, a seção transversal exerceu influência na propagação da onda de ultrassom e que a velocidade longitudinal foi fortemente afetada pela frequência do transdutor para frequências abaixo de 500 kHz, corroborando a importância de sempre se adotarem, nos ensaios, relações de comprimento de percurso/comprimento de onda superiores a 3,0.Several works use the ultrasound wave propagation velocity as the main parameter to determine the mechanical properties of wood. Since this velocity can be influenced by the specimen's dimension or by the transducer's frequency, this influence must be known to obtain reliable results. During research on the influence of specimen dimension on destructive testing of the compression parallel to the grain, 0.03 x 0.03 x 0.09 m and 0.05 x 0.05 x 0.15 m specimens were tested to evaluate the variation in wave propagation velocity as a function of specimen dimension

  11. UV-vis in situ spectrometry data mining through linear and non linear analysis methods

    OpenAIRE

    Liliana López-Kleine; Andrés Torres

    2014-01-01

    Los espectrómetros UV-visibles son captores que registran la absorbancia de luz emitida por partículas suspendidas en el agua a diferentes longitudes de onda y proporcionan mediciones en continuo, las cuales pueden ser interpretadas como concentraciones de parámetros comúnmente usados para evaluar el estado físico-químico de cuerpos de agua. Parámetros clásicos usados para detectar la presencia de contaminación en el agua son los sólidos suspendidos totales (TSS) y la demanda química de oxíge...

  12. Coupling coefficients of SO(n) and integrals involving Jacobi and Gegenbauer polynomials

    International Nuclear Information System (INIS)

    Alisauskas, Sigitas

    2002-01-01

    The expressions for the coupling coefficients (3j-symbols) for most degenerate (symmetric) representations of orthogonal groups SO(n) in a canonical basis (with SO(n) restricted to SO(n-1) and different semicanonical or tree bases (with SO(n) restricted to SO(n')xSO(n''), n'+n''=n) are considered, respectively, in context of integrals involving triplets of the Gegenbauer and the Jacobi polynomials. Since the directly derived triple-hypergeometric series do not reveal the apparent triangle conditions of the 3j-symbols, they are rearranged, using their relation with semistretched isofactors of the second kind for the complementary chain Sp(4) contains SU(2)xSU(2) and analogy with the stretched 9j coefficients of SU(2), into formulae with more rich limits for summation intervals and obvious triangle conditions. The isofactors of class-one representations of orthogonal groups or class-two representations of unitary groups (and, of course, the related integrals involving triplets of the Gegenbauer and the Jacobi polynomials) turn into double sums in the cases of canonical SO(n) contains SO(n-1) or U(n) contains U(n-1) and semicanonical SO(n) contains SO(n-2)xSO(2) chains, as well as into the 4 F 3 (1) series under more specific conditions. Some ambiguities of the phase choice of the complementary group approach are adjusted, as well as problems with an alternating sign parameter of SO(2) representations in the SO(3) contains SO(2) and SO(n) contains SO(n-2)xSO(2) chains. (author)

  13. A Letter from a Black Mom to Her Son

    Science.gov (United States)

    Watson, Dyan

    2012-01-01

    An African American mother and teacher educator uses examples from her own childhood to describe how she hopes her child will be treated by teachers, and what she fears. In her letter to her son, the African American mom expresses how she want teachers to know her son's journey to school--metaphorically and physically. She wants them to know that…

  14. Ondas J de Osborn en hipotermia: Presentación de un caso poco frecuente en el trópico Osborn waves in hypothermia: One rare case in the tropic

    Directory of Open Access Journals (Sweden)

    Eduardo Ramírez

    2009-08-01

    Full Text Available En 1953, el Doctor John Osborn describió la onda J en el electrocardiograma. La hipotermia (temperatura corporal menor a 35 grados centígrados inicialmente se asocia a taquicardia sinusal, pero con temperaturas menores a 32,2 grados centígrados se inicia la bradicardia sinusal, asociada a prolongación progresiva del intervalo PR, el complejo QRS y el intervalo QTc. De otra parte, a temperaturas por debajo de 30 grados centígrados, 80% de los pacientes presenta ondas J o de Osborn, que consisten en una deflexión extra, al final del QRS, la cual se observa mejor en las derivaciones inferiores y laterales. Empeora a medida que la temperatura desciende y mejora en el momento en que al paciente se le incrementa su temperatura corporal. Este fenómeno no es raro en países con estaciones, pero en el trópico no es un hallazgo frecuente.Dr. John Osborn described J wave in the electrocardiogram 1953. Hypothermia (body temperature < 35°C is initially associated with sinus tachycardia, but with temperatures < 32.2°C, sinus bradycardia associated to progressive prolongation of PR interval, QRS complex and QTc interval, appears. Otherwise, at temperatures below 30°C, 80% patients present J or Osborn waves consisting of an extra deflection at the end of QRS, best depicted in inferior and lateral leads. They become more prominent as the temperature drops and gradually disappear with re-warming. This phenomenon is not rare in countries with 4 seasons but is not common in the tropics.

  15. Crustal thickness mapping in Raipur–Katni area of Narmada–Son ...

    Indian Academy of Sciences (India)

    The Narmada–Son lineament (NSL) is one of the most prominent tectonic features which divides the .... fault at Red Sea area (Bhattacharjee and Koide. 1978). The Son and .... relationship between SI and number of infinite dimension of the ...

  16. Benefits of Self-Organizing Networks (SON for Mobile Operators

    Directory of Open Access Journals (Sweden)

    Olav Østerbø

    2012-01-01

    Full Text Available Self-Organizing Networks (SON is a collection of functions for automatic configuration, optimization, diagnostisation and healing of cellular networks. It is considered to be a necessity in future mobile networks and operations due to the increased cost pressure. The main drivers are essentially to reduce CAPEX and OPEX, which would otherwise increase dramatically due to increased number of network parameters that has to be monitored and set, the rapidly increasing numbers of base stations in the network and parallel operation of 2G, 3G and Evolved Packet Core (EPC infrastructures. This paper presents evaluations on the use of some of the most important SON components. Mobile networks are getting more complex to configure, optimize and maintain. Many SON functions will give cost savings and performance benefits from the very beginning of a network deployment and these should be prioritized now. But even if many functions are already available and can give large benefits, the field is still in its infancy and more advanced functions are either not yet implemented or have immature implementations. It is therefore necessary to have a strategy for how and when different SON functions should be introduced in mobile networks.

  17. Quantum optical signals in telecommunication networks

    OpenAIRE

    Ciurana Aguilar, Alex; Martinez Mateo, Jesus; Martín Ayuso, Vicente; Soto, M.

    2012-01-01

    Introducción a una red óptica metropolitana cuántica donde señales cuánticas y convencionales son multiplexadas en longitud de onda utilizando bandas separadas del espectro óptico. El enrutado se realiza con componentes pasivos para no perturbar los qubits. Se estudian dos redes: red de acceso WDM-PON y red metropolitana completa con backbone DWDM y redes de acceso WDM-PON.

  18. SON is a spliceosome-associated factor required for mitotic progression.

    Science.gov (United States)

    Huen, Michael S Y; Sy, Shirley M H; Leung, Ka Man; Ching, Yick-Pang; Tipoe, George L; Man, Cornelia; Dong, Shuo; Chen, Junjie

    2010-07-01

    The eukaryotic RNA splicing machinery is dedicated to the daunting task of excising intronic sequences on the many nascent RNA transcripts in a cell, and in doing so facilitates proper translation of its transcriptome. Notably, emerging evidence suggests that RNA splicing may also play direct roles in maintaining genome stability. Here we report the identification of the RNA/DNA-binding protein SON as a component of spliceosome that plays pleiotropic roles during mitotic progression. We found that SON is essential for cell proliferation, and that its inactivation triggers a MAD2-dependent mitotic delay. Moreover, SON deficiency is accompanied by defective chromosome congression, compromised chromosome segregation and cytokinesis, which in turn contributes to cellular aneuploidy and cell death. In summary, our study uncovers a specific link between SON and mitosis, and highlights the potential of RNA processing as additional regulatory mechanisms that govern cell proliferation and division. © 2010 Landes Bioscience

  19. Contribución al estudio y optimización de dispositivos basados en holografía dinámica para su uso en redes ópticas pasivas multiplexadas en longitud de onda Wdm-Pon

    OpenAIRE

    Martín Minguez, Alfredo

    2007-01-01

    La utilización de Redes Ópticas Pasivas Multiplexadas por División en el Tiempo (TDMPON), y más recientemente de las Redes Ópticas Pasivas Multiplexadas en Longitud de Onda (WDM-PON), con sus dos principales tecnologías, CWDM y DWDM, en distintas topologías de red para optimizar los recursos disponibles, implica el uso de diversos componentes ópticos como transmisores, receptores, de/multiplexores, filtros, etc. Es en este contexto donde el uso de dispositivos holográficos, WDM sintonizables,...

  20. Evaluación del comportamiento mecánico y superficial de materiales metálicos sometidos a tratamientos de compresión mediante ondas de choque generadas por láser

    OpenAIRE

    Gutiérrez González, Javier

    2016-01-01

    El presente trabajo de fin de grado se ha desarrollado en el Centro Láser de la Universidad Politécnica de Madrid y ha consistido en la caracterización mecánica y superficial del acero AISI 316L tras haber sido tratado mediante el tratamiento “Laser peening” y el estudio de la estabilidad de las tensiones residuales inducidas al ser sometido a un tratamiento a 500ºC durante dos horas. El tratamiento LSP es un tratamiento mecánico superficial que consiste en la creación de ondas de choque ...

  1. Velocidade de onda ultrassônica longitudinal e transversal em concretos estruturais de variadas resistências submetidos à compressão simples e à tração por compressão diametral.

    OpenAIRE

    Andreza Vera Pyrrho de Araújo

    2015-01-01

    O trabalho discute o padrão de comportamento de ondas ultrassônicas longitudinais (compression waves) e transversais (shear waves) em concretos de variadas resistências submetidos a compressão axial e diametral. Foram ensaiados 112 corpos de prova confeccionados de concretos com variadas resistências a compressão, dentro do intervalo atualmente contemplado pela NBR 6118/2014. Os corpos de provas foram submetidos ao ensaio de compressão simples, tração por compressão diametral e módulo de e...

  2. Velocidade da onda de pulso, pressão arterial e adipocitocinas em adultos jovens: estudo do Rio de Janeiro Pulse wave velocity, blood pressure and adipocytokines in young adults: the Rio de Janeiro study

    Directory of Open Access Journals (Sweden)

    Oswaldo Luiz Pizzi

    2013-01-01

    Full Text Available FUNDAMENTO: Dados sobre a avaliação não invasiva vascular e suas relações com variáveis de risco cardiovascular são escassos em jovens. OBJETIVO: Avaliar a relação entre a velocidade de onda de pulso e a pressão arterial,variáveis antropométricas e metabólicas, incluindo as adipocitocinas, em indivíduos adultos jovens. MÉTODOS: Foram avaliados 96 indivíduos (51 homens do estudo do Rio de Janeiro, de 26 a 35 anos (média 30,09 ± 1,92. Foram obtidos a velocidade de onda de pulso (método Complior, pressão arterial, índice de massa corporal, glicose, perfil lipídico, leptina, insulina, adiponectina e o índice de resistência à insulina HOMA-IR. Os indivíduos foram estratificados em três grupos segundo o tercil da VOP para cada sexo. RESULTADOS: O grupo com maior tercil de VOP mostrou maiores médias de pressão arterial sistólica, pressão arterial diastólica, pressão arterial média, índice de massa corporal, insulina, HOMA-IR e menores médias de adiponectina, além de maiores prevalências de diabetes mellitus/intolerância à glicose e hiperinsulinemia. Houve correlação significativa e positiva da velocidade da onda de pulso com pressão arterial sistólica, pressão arterial diastólica, pressão de pulso e pressão arterial média, índice de massa corporal, e LDL-colesterol e negativa com HDL-colesterol e adiponectina. Em modelo de regressão múltipla, após ajuste do HDL-colesterol, LDL-colesterol e adiponectina para sexo, idade, índice de massa corporal e pressão arterial média, apenas o sexo masculino e a pressão arterial média mantiveram correlação significativa com a velocidade de onda de pulso. CONCLUSÃO: A velocidade de onda de pulso em adultos jovens mostrou relação significativa com variáveis de risco cardiovascular, destacando-se o sexo masculino e a pressão arterial média como importantes variáveis no seu determinismo. Os achados sugerem que a medida da VOP pode ser útil para a

  3. Velocidade da onda de pulso, pressão arterial e adipocitocinas em adultos jovens: estudo do Rio de Janeiro Pulse wave velocity, blood pressure and adipocytokines in young adults: the Rio de Janeiro study

    Directory of Open Access Journals (Sweden)

    Oswaldo Luiz Pizzi

    2012-01-01

    Full Text Available FUNDAMENTO: Dados sobre a avaliação não invasiva vascular e suas relações com variáveis de risco cardiovascular são escassos em jovens. OBJETIVO: Avaliar a relação entre a velocidade de onda de pulso e a pressão arterial,variáveis antropométricas e metabólicas, incluindo as adipocitocinas, em indivíduos adultos jovens. MÉTODOS: Foram avaliados 96 indivíduos (51 homens do estudo do Rio de Janeiro, de 26 a 35 anos (média 30,09 ± 1,92. Foram obtidos a velocidade de onda de pulso (método Complior, pressão arterial, índice de massa corporal, glicose, perfil lipídico, leptina, insulina, adiponectina e o índice de resistência à insulina HOMA-IR. Os indivíduos foram estratificados em três grupos segundo o tercil da VOP para cada sexo. RESULTADOS: O grupo com maior tercil de VOP mostrou maiores médias de pressão arterial sistólica, pressão arterial diastólica, pressão arterial média, índice de massa corporal, insulina, HOMA-IR e menores médias de adiponectina, além de maiores prevalências de diabetes mellitus/intolerância à glicose e hiperinsulinemia. Houve correlação significativa e positiva da velocidade da onda de pulso com pressão arterial sistólica, pressão arterial diastólica, pressão de pulso e pressão arterial média, índice de massa corporal, e LDL-colesterol e negativa com HDL-colesterol e adiponectina. Em modelo de regressão múltipla, após ajuste do HDL-colesterol, LDL-colesterol e adiponectina para sexo, idade, índice de massa corporal e pressão arterial média, apenas o sexo masculino e a pressão arterial média mantiveram correlação significativa com a velocidade de onda de pulso. CONCLUSÃO: A velocidade de onda de pulso em adultos jovens mostrou relação significativa com variáveis de risco cardiovascular, destacando-se o sexo masculino e a pressão arterial média como importantes variáveis no seu determinismo. Os achados sugerem que a medida da VOP pode ser útil para a

  4. Uso de ondas de alta frequência no tratamento de onicomicose: comunicação preliminar de três casos The use of high frequency waves to treat onychomycosis: preliminary communication of three cases

    Directory of Open Access Journals (Sweden)

    Juliana Leal Monteiro da Silva

    2011-06-01

    Full Text Available A pesquisa avaliou a eficácia de ondas de alta frequência, no tratamento de onicomicose em 3 pacientes, durante 12 meses, através do exame clínico das unhas e exame micológico. O agente causal da micose nos três pacientes foi o dermatófito Trichophyton rubrum, e, após a aplicação da alta frequência, foi possível observar uma grande melhora no aspecto das unhas e uma inibição do crescimento em cultura, apesar do micológico direto se manter positivo. O estudo preliminar dos três casos demonstrou a atividade fungistática das ondas de alta frequência sendo um método promissor para ser utilizado, em associação com fármacos convencionaisThe research evaluated the efficacy of high frequency waves in the treatment of onychomycosis in three patients during twelve months through the clinical examination of nails and also through mycological examination. The causative agent of the mycosis, in the three patients, was the dermatophyte Trichophyton rubrum and after application of high frequency, it was possible to notice a great improvement in the appearance of nails and also growth inhibition in culture despite the fact that the mycological examination remained positive. The preliminary study of the three cases demonstrated that the fungistatic activity of high frequency waves is a promising method to be used in combination with conventional drugs

  5. Punto de conversión común para la obtención de imágenes sísmicas de ondas convertida (PS) a partir de sísmica multicomponente

    OpenAIRE

    Bautista Guachavez, Carlfred Roso

    2011-01-01

    Este trabajo pretende mostrar los conceptos básicos inherentes al procesado de ondas convertidas (modo P a S), relacionados a la corrección requerida en la ubicación de la traza sísmica asociada a la componente radial. Para ello se partió de la deducción geométrica de la ecuación polinómica establecida por Behle y Dohr (1985) que gobierna la corrección a las coordenadas del Punto Medio Común, teniendo en cuenta un medio homogéneo e isotrópico; así como del principio de Mínima Acción; y del pr...

  6. THE MOTIF OF THE PRODIGAL SON IN IVAN TURGENEV'S NOVELS

    Directory of Open Access Journals (Sweden)

    Valentina Ivanovna Gabdullina

    2013-11-01

    Full Text Available The author questions the perception of Ivan Turgenev as a “non- Christian writer” and studies the problem of the prodigal son motif functioning in a series of his novels. In his novels, Turgenev pictured different phases of the archetypal story, originating from the Gospel parable of the prodigal son. In the novel Rudin he depicted the phase of spiritual wanderings of the hero who had lost touch with his native land — Russia. In his next novels (Home of the Gentry, Fathers and Sons and Smoke, after leading his hero in circles and sending him back to his paternal home, Turgenev reconstructs the model of human behavior, represented in the parable, thereby recognizing the immutability of the idea formalized in the Gospel. The motif of the return to Russian land gets its completion in Turgenev's last novel Virgin Soil, in which the author paradoxically connects the Westernist idea with the Gospel imperative. Solomin, the son of a deacon, sent by his wise father out to Europe “to get education”, studies in England, masters the European knowledge and returns back “to his native land” to establish his own business in inland Russia. Thus, a series of Turgenev's novels, in which he portrayed different phases of social life, are interlinked with the motif of the prodigal son, who is represented by novels' main characters.

  7. HPV vaccine for teen boys: Dyadic analysis of parents' and sons' beliefs and willingness.

    Science.gov (United States)

    Moss, Jennifer L; Reiter, Paul L; Brewer, Noel T

    2015-09-01

    Parents and adolescents often decide together whether the child should receive human papillomavirus (HPV) vaccine. However, few studies have investigated the dyadic nature of beliefs that affect this process. Data came from the 2010 HPV Immunization in Sons (HIS) Study, a national sample of 412 parents and their adolescent sons. We conducted dyadic multivariate logistic regression to examine the relationships between parents' and sons' HPV vaccine beliefs and their willingness to have the son receive the vaccine. Less than half of parents and sons were willing to have the sons receive HPV vaccine (43% and 29%, respectively). Willing parents and sons anticipated greater regret if the son did not receive HPV vaccine but later contracted an HPV infection (parent odds ratio [OR]=1.72, 95% confidence interval [CI]=1.24-2.40; son OR=1.51, 95% CI=1.04-2.19) (both pCommunication campaigns may be able to target these beliefs to increase parents' and sons' willingness to seek HPV vaccination. Copyright © 2015 Elsevier Inc. All rights reserved.

  8. La fibra óptica y el fenómeno no lineal mezcla de cuarta onda

    Directory of Open Access Journals (Sweden)

    Fabián Gómez López

    2015-12-01

    Full Text Available RESUMEN Para aprovechar de mejor manera el ancho de banda que tiene la fibra óptica, los sistemas de comunicaciones ópticos han tenido que aumentar la potencia de transmisión de las señales para poder transportar a grandes distancias la información. Debido a lo anterior, comienzan a producirse ciertos fenómenos ópticos no lineales como la mezcla de cuarta onda (Four Wave Mixing, FWM, que degradan la señal de información. En este documento se realiza un estado del arte de la fibra óptica y un estudio del fenómeno no lineal FWM, que se genera cuando dos o más señales ópticas se propagan en la fibra, lo cual conlleva a una mezcla de señales que puede generar nuevos componentes de interferencia de la señal óptica transmitida. ABSTRACT To make better use of the bandwidth that has the optical fiber, optical communications systems have had to increase the transmission power of signals to transport information over long distances. Because of this, certain nonlinear optical phenomena such as four wave mixing (Four Wave Mixing, FWM, which degrade the information signal begin to occur. Herein a state of the art of optical fiber and a study of the nonlinear FWM phenomenon, which is generated when two or more optical signals propagating in the fiber takes place, which leads to a mixture of signals that can generate new components interference of the transmitted optical signal.

  9. Automatic guided wave communication system using steel pipes as communication channel for flood detection in steel offshoreoilrigs; Sistema automatico de comunicacion de ondas guiadas para la deteccion de tubos de refuerzo inundados en plataformas petroleras costa fuera

    Energy Technology Data Exchange (ETDEWEB)

    Mijarez Cstro, Rito; Martinez Ramirez, Fernando [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2010-10-09

    An automatic guided wave Pulse Position Modulation (PPM) system, using steel tubes as communication channel, for detecting flooding in the hollow sub-sea structures of offshore oilrigs is presented. The system employs two smart piezoelectric based sensors and modulators and a demodulator based on a piezoelectric transducer, a Digital Signal Processor (DSP) and a microcontroller. Experiments performed in the laboratory, in a tubular steel heliport structure and the base of a deck of an oilrig under construction, have successfully distinguished automatically guided wave encoded information. [Spanish] Este articulo presenta un trabajo de investigacion en el cual se desarrolla un sistema automatico de comunicacion de ondas guiadas por modulacion por posicion de pulsos (PPM), orientado a la deteccion de miembros inundados en los tubos de refuerzo de las plataformas petroleras costa fuera. El sistema utiliza de manera novedosa tubos de acero como medio de comunicacion y emplea dos sensores/moduladores inteligentes compuestos de cristales piezoelectricos, electronica basada en un microcontrolador y baterias. La instrumentacion del demodulador consta de un transductor piezoelectrico de ultrasonido, un procesador digital de senales (DSP) y un microcontrolador, el cual lleva a cabo de manera automatica la deteccion de ondas guiadas. Los experimentos se realizaron en aire, en laboratorio, en una estructura tubular de acero del helipuerto y en la base de una plataforma bajo construccion.

  10. UNA NUEVA ALTERNATIVA NUMÉRICA PARA LA SOLUCIÓN DE LA ECUACIÓN UNIDIMENSIONAL DE RICHARDS: ESTUDIO DE DRENAJE E INFILTRACIÓN DE FLUIDOS EN LA ZONA NO SATURADA

    Directory of Open Access Journals (Sweden)

    Evelyn Álvarez Sierra

    2016-10-01

    Full Text Available En el trabajo se comparan dos métodos numéricos para resolver el modelo unidimensional de infiltración y drenaje de agua en la zona no saturada en medios porosos, el cual es modelado respecto al contenido de humedad utilizando la ecuación no-lineal de Richards. El primer método está basado en el método clásico de Diferencias Finitas y el segundo en el método de Líneas combinado con el código DASSL para la solución de las ecuaciones diferenciales-algebraicas resultantes. Se muestra que el último método proporciona una vía numérica eficiente para la solución de problemas de EDPs que tienen un comportamiento singular de shock u ondas viajeras, como es el caso de la ecuación de Richard, los cuales se pueden resolver numéricamente con éxito sólo utilizando esquemas muy estables. Los métodos numéricos discutidos en el trabajo se aplican a dos tipos de suelos reales: Yolo Light Clay y Brindabella Silty Clay Loam, usando las propiedades hidráulicas referidas en Broadbridge y White [16]. Para validar el modelo, se comparan los perfiles de humedad con los resultados reportados por Warrick, Lomen e Islas [18].Igualmente, se demuestra con datos reales la ventaja de resolver numéricamente el comportamiento del flujo unidimensional en la zona no saturada de un medio poroso. Finalmente, el modelo propuesto y los resultados numéricos obtenidos posibilitan brindar un pronóstico sobre la utilización de recursos hídricos para el caso de riego en agricultura y también para el transporte de contaminantes.

  11. Implementación del control tipo Latching para olas regulares

    OpenAIRE

    Martínez Tortosa, María Loreto

    2017-01-01

    La energía de las olas es una energía que todavía se encuentra en periodo de desarrollo, pero que sin embargo posee un gran potencial. Es la forma más notable de la energía del océano, posiblemente debido a los efectos destructivos de las olas. Las olas son producidas por la acción del viento y por lo tanto son una forma indirecta de energía solar. Esto implica que es una energía renovable, es decir, inagotable. Existe una amplia variedad de tecnologías de la energía de onda resultantes d...

  12. Estudo do crescimento de nanofitas de céria dopada com gadolínio por sistema de aquecimento por micro-ondas

    Directory of Open Access Journals (Sweden)

    R. F. Gonçalves

    2013-09-01

    Full Text Available O óxido de cério (céria tem atraído atenção devido às suas importantes aplicações, como em células a combustível de óxido sólido, catalisadores de gases de exaustão de automóveis, catalisadores para a obtenção de hidrogênio, bloqueadores de raios ultravioleta, biomateriais, entre outros. Controlar os métodos de síntese da céria é de grande importância para explicar ou prever essas propriedades. Desta forma, o objetivo deste trabalho foi estudar o crescimento de nanofitas de óxido de cério em um sistema hidrotérmico assistido por micro-ondas, no qual 8 min foram obtidas nanofitas com comprimentos próximos a 330 nm, em 130 ºC e pressão de 3 atm. Os resultados colaboram para pesquisas em reformadores para obtenção de etanol e/ou anodos de células combustíveis de óxido sólido.

  13. Supersymmetric vector multiplets in nonadjoint representations of SO(N)

    International Nuclear Information System (INIS)

    Nishino, Hitoshi; Rajpoot, Subhash

    2007-01-01

    In the conventional formulation of N=1 supersymmetry, a vector multiplet is supposed to be in the adjoint representation of a given gauge group. We present a new formulation with a vector multiplet in the nonadjoint representation of SO(N) gauge group. Our basic algebra is [T I ,T J ]=f IJK T K , [T I ,U i ]=-(T I ) ij U j , [U i ,U j ]=-(T I ) ij T I , where T I are the generators of SO(N), while U i are the new ''generators'' in certain nonadjoint real representation R of SO(N). We use here the word generator in the broader sense of the word. Such a representation can be any real representation of SO(N) with the positive definite metric, satisfying (T I ) ij =-(T I ) ji and (T I ) [ij| (T I ) |k]l ≡0. The first nontrivial examples are the spinorial 8 S and conjugate spinorial 8 C representations of SO(8) consistent with supersymmetry. We further couple the system to chiral multiplets and show that a Higgs mechanism can give positive definite (mass) 2 to the new gauge fields for U i . We show an analogous system working with N=1 supersymmetry in 10D, and thereby N=4 system in 4D interacting with extra multiplets in the representation R. We also perform superspace reformulation as an independent confirmation

  14. Some relevant properties of SO(n) representations for Grand unified theories

    International Nuclear Information System (INIS)

    Girardi, G.; Sorba, P.; Sciarrino, A.

    1980-05-01

    General properties of the SO(n) groups are examined, with emphasis on the usefulness of the Gel'fand-Zetlin basis for explicit calculations. The SO(n) representations containing a vector stabilized by subgroups of the type S[O(n-p) x O(p)], SU(k) x U(1) or SU(k) if n=2k, are characterized in view of selecting Higgs representations in SO(n) gauge models. Some useful properties of the SU(n) Gel'fand-Zetlin basis are given in the appendices

  15. Views of Astronaut (Col.) Joe Engle and son Jon with L-5 Piper Cub

    Science.gov (United States)

    1981-01-01

    Views of Astronaut (Col.) Joe Engle and son Jon with L-5 Piper Cub at Clover Airport. Photos include Engle turning propeller while his son sits in the cockpit (34323); both Engle and son examine propeller (34324); Engle works on engine while his son sits in cockpit (34325).

  16. Influência das vogais na estimulabilidade dos sons líquidos

    OpenAIRE

    Castro,Márcia Mathias de; Wertzner,Haydée Fizbein

    2009-01-01

    OBJETIVO: verificar o número de crianças, entre 5:0 e 11:6 anos, com e sem Transtorno Fonológico, falantes do Português Brasileiro que imitaram corretamente os sons líquidos no teste de estimulabilidade considerando cada uma das vogais subsequentes. MÉTODOS: a estimulabilidade foi medida por uma prova de imitação de 63 sílabas com os sons com as sete vogais orais, em três repetições. Foi analisada a porcentagem de sujeitos que produziu corretamente os sons em função da vogal subsequente. RESU...

  17. In the Pursuit of Sons: Additional Births or Sex-Selective Abortion in Pakistan?

    Science.gov (United States)

    Zaidi, Batool; Morgan, S Philip

    2016-12-01

    Even though Pakistan is a highly patriarchal society, it has not featured prominently in studies focusing on sex-selective abortion and sex ratios at birth. But with fertility declining and existing strong son preference-Pakistan has one of the highest desired sex ratios in the world-how will Pakistani families respond? In the pursuit of sons, will they have additional children or resort to sex-selective abortions? Or is there evidence that the pursuit of sons is weakening? Using data from three rounds of the demographic and health survey, we show clear evidence of son preference in fertility intentions, patterns of contraceptive use and parity progression ratios. More specifically, we find pervasive evidence that Pakistanis continue childbearing to have a son, to have more than one son and to have at least one daughter. We do not find consistent and convincing evidence that sex ratios at birth (which indicate sex-selective abortion) are increasing.

  18. My Son 22.10.11

    Directory of Open Access Journals (Sweden)

    Rebecca Baillie

    2013-01-01

    Full Text Available 'My Son 22.10.11' was made immediately following a miscarriage 8 weeks into pregnancy. After bleeding lightly for a couple of hours, I went to the toilet and a large bloody mass fell from within me. I knew that I could not flush this away, and that to retrieve the mass was my only chance to connect with the unborn foetus. I fished the contents from the bottom of the toilet bowl using my hands and carried them into my small studio. I found some paper and began to dissect the mass. At the centre, I found the tiny, cold, hard foetus. I kissed it and then began to use it as a kind of painting tool, drawing the outline of the lost child using its very own flesh and blood. I knew that to create a lasting and tangible portrait of 'my son' was the best way to understand the somewhat unreal and fleeting experience of miscarriage. I thought of Frida Kahlo while making the work, thinking 'thank God' that I had a reference to miscarriage before it happened to me. I also thought of my childhood days spent on our family pig farm, and of all the dead pig foetuses that I had seen at various stages of development. Before the miscarriage, I thought little about the subject; afterwards, I recognise the profundity of the creation of a life that is never born. The experience is so common, yet so very rarely discussed or depicted.

  19. VIGILANCIA DE LA PANDEMIA DE GRIPE (H1N1 2009 EN ESPAÑA

    Directory of Open Access Journals (Sweden)

    Amparo Larrauri Cámara

    2010-01-01

    Full Text Available Fundamento: España experimentó una circulación del nuevo virus de la gripe (H1N12009 durante el verano de 2009, que evolucionó de forma creciente hasta la presentación a principios del otoño de la primera onda pandémica por dicho virus. Los objetivos de este trabajo son describir la evolución de esta onda pandémica en nuestro país y evaluar su impacto en la morbilidad y mortalidad de la población española. Método: A partir de la información proporcionada por el Sistema de Vigilancia de la Gripe en España y el Centro de Coordinación de Alertas y Emergencias del Ministerio de Sanidad y Política Social se han estimado una serie de indicadores epidemiológicos y virológicos para evaluar el nivel de actividad e intensidad de la onda pandémica, así como su gravedad. Resultados: La onda pandémica por el virus (H1N12009 se inició a comienzos del otoño de 2009 y registró valores máximos de incidencia de gripe de 372,15 casos semanales/100.000 habitantes. Las mayores tasas de incidencia de gripe se observaron en los menores de 15 años. La tasa de detección viral en el periodo pandémico se mantuvo en el rango de las registradas previamente (46,4%. Se estimó una tasa de letalidad global de 0,43 defunciones por 1.000 casos de gripe pandémica. Un 64% de las defunciones por gripe pandémica se registraron en adultos jóvenes, con máximas tasas de mortalidad en el grupo de 45-64 años (9,35 defunciones/1.000.000 habitantes. La mortalidad asociada a gripe estacional en el periodo 2001- 2008 fue máxima en los mayores de 64 años (95% del total de defunciones. Conclusiones: La onda pandémica por el virus de la gripe (H1N12009 tuvo una presentación precoz en España y una intensidad media en comparación con las trece ondas estacionales previas de gripe. Esta primera onda también se caracterizó por un carácter leve, teniendo en cuenta tasas de letalidad o mortalidad, si bien un elevado porcentaje de las defunciones confirmadas

  20. Desarrollo de métodos para la evaluación integrada de propiedades mecánicas y superficiales inducidas en materiales metálicos mediante tratamiento superficial por ondas de choque generadas por láser

    OpenAIRE

    Ruiz de Lara de Luis, Leonardo

    2016-01-01

    El tratamiento superficial por ondas de choque generadas por láser, LSP, es una técnica cuyo principal objetivo es el de la modificación del estado tensional de las primeras micras en profundidad de materiales metálicos. En sus comienzos está técnica fue empleada para inducir tensiones residuales de compresión en superficie, pero mientras se avanzaba en su desarrollo se empezaron a observar otros efectos. Profundizando en ellos se llega a la conclusión de que existe una fuerte relación entre ...

  1. Son Preference and Family Limitation in Pakistan: A Parity- and Contraceptive Method-Specific Analysis.

    Science.gov (United States)

    Channon, Melanie Dawn

    2017-09-01

    Son preference exerts a strong influence over contraceptive and fertility decisions in many South Asian countries. In Pakistan, where fertility remains high and contraceptive use low, research on son preference has been limited. Data from Pakistan Demographic and Health Surveys conducted in 1990-1991, 2006-2007 and 2012-2013 were used to examine potential indicators and outcomes of son preference. Descriptive analyses looked at sex composition preferences of men and women, as well as the sex ratio at last birth. Multivariate logistic regression analyses examined parity progression by birth order, while multinomial logistic regression was used to identify associations between sex composition and use of permanent, temporary and traditional contraceptive methods. Parity progression and choice of contraceptive method are increasingly associated with the sex composition of children. Many respondents wanted at least two sons, though most also wanted at least one daughter. Analyses suggest that the prevalence of modern contraceptive use among parous women would have been 19% higher in 2012-2013 in the absence of son preference. Permanent method use was extremely low among women with no sons and increased significantly with number of sons. The association between number of sons and use of temporary methods was weaker, while son preference had little relationship with traditional method use. The association of son preference with parity progression and modern contraceptive use has become stronger in Pakistan. Continuation of the fertility transition may be difficult unless the degrees of differential stopping behavior and differential contraceptive use decline.

  2. Having a Son Promotes Clean Cooking Fuel Use in Urban India: Women's Status and Son Preference

    OpenAIRE

    Avinash Kishore; Dean Spears

    2014-01-01

    Urban Indian households with a male first child are approximately 2 percentage points more likely to use clean cooking fuel than comparable households with a female first child. Given Indian son preference, there are at least two mechanisms by which child sex could affect fuel choice: by improving the intrahousehold status of women, who bear more of the costs of traditional fuels, or by presenting an opportunity to invest in children's health, in the context of a preference for healthier boys...

  3. Mothers' Predictions of Their Son's Executive Functioning Skills: Relations to Child Behavior Problems

    Science.gov (United States)

    Johnston, Charlotte

    2011-01-01

    This study examined mothers' ability to accurately predict their sons' performance on executive functioning tasks in relation to the child's behavior problems. One-hundred thirteen mothers and their 4-7 year old sons participated. From behind a one-way mirror, mothers watched their sons perform tasks assessing inhibition and planning skills.…

  4. The institutionalization of Jesus' charismatic authority: "Son of Man" as case study1

    Directory of Open Access Journals (Sweden)

    Yolanda Dreyer

    2000-12-01

    Full Text Available This article argues that Jesus used the expression "son of man" not in a titular way, but genetically, meaning "humankind". This use of "son of man" developed into a titular usage in which Jesus is identified with "Son of Man". The study shows that Jesus' use of the expression "son of man" should be understood in the context of the "little tradition" which was reinterpreted in terms of the "great tradition" in a titular way. It is argued that this transition from "litle tradition" to "great tradition"can be seen as "false attribution". After Jesus' death when his followers reorganized themselves into a cultic community, they gave Jesus the position "founder of the cult". They did this by making use of honorary titles. The use of the title "Son of Man" for Jesus is interpreted in terms of the social theory of the institutionalization of charismatic authority. The focus is on the title "Son of Man" as it appears in legal sayings or church rules, wisdom sayings and prophetic and apocalyptic sayings.

  5. Avaliação estatística da variação da velocidade de propagação de ondas de ultra-som na madeira em presença de defeitos Statistical evaluation of the ultrasonic wave velocity variation in defective wood

    Directory of Open Access Journals (Sweden)

    Carlos T. Puccini

    2002-12-01

    Full Text Available Os métodos visuais para a detecção de defeitos na madeira, ainda que de grande utilidade, podem ser falhos e exigem a utilização de mão-de-obra relativamente bem treinada. Muitas vezes, a presença de nós, rachaduras ou, ainda, regiões com medula no interior de uma peça serrada, podem ser imperceptíveis na avaliação visual. Um dos grandes avanços obtidos nos últimos anos na caracterização de materiais, tanto do ponto de vista mecânico quanto da qualidade, é a aplicação de técnicas que utilizam a propagação de ondas, destacando-se, dentre elas, o ultra-som. O objetivo deste trabalho é avaliar, estatisticamente, a possibilidade de se utilizar o método do ultra-som na detecção de defeitos em peças de madeira serrada. Para isto, foram utilizadas 180 peças de dimensões nominais: 0,027 m de espessura; 0,10 m de largura e 0,25 m de comprimento, retiradas de vigas de Pinus sp obtidas em serraria da cidade de Campinas. As peças foram ensaiadas na umidade de equilíbrio ao ar. Para a realização dos ensaios utilizou-se o equipamento de emissão de ondas de ultra-som marca Steinkamp BP-7 com transdutores de 45 kHz. Inicialmente foi realizada uma análise visual das peças e, posteriormente, a determinação da velocidade de propagação das ondas nas mesmas peças. Com os resultados, realizou-se uma análise exploratória das variáveis e obteve-se um modelo de regressão logística visando verificar a relação entre a presença ou não de defeitos e a velocidade de propagação da onda do ultra-som na madeira. Os resultados demonstram uma forte relação entre a velocidade de propagação da onda de ultra-som e os defeitos detectados pela análise visualVisual methods to detect wood defects, although of great utility, can lead to inaccurate results and demand a specialist to carry it out. The presence of knots, cracks or pith regions inside a sawed piece can be imperceptible in the visual evaluation. One of the greatest

  6. Son, Sent, and Servant

    Directory of Open Access Journals (Sweden)

    Truls Åkerlund

    2015-11-01

    Full Text Available This study challenges the claim that Jesus is the archetypical servant leader as described in contempo-rary leadership literature. Based on a theological reading of the Fourth Gospel, the paper suggests that, as a servant, Jesus cannot be understood apart from his mission and obedience to God. Consequently, Jesus was not primarily a servant leader but rather the Son who was sent to the world to enact the Fa-ther’s will. In this regard, the Fourth Gospel provides a unique perspective that is barely noted in the current discourse on servant leadership modelled on the example of Christ. Although certain aspects of servant leadership theory correspond to John’s portrayal of Jesus, the study concludes that other de-scriptions of him as a servant leader suffer from a one-sided and reductionist Christology. Implications of this view for Christian ministry are briefly sketched out.

  7. The experience of sons caring for a parent with dementia.

    Science.gov (United States)

    McDonnell, Eilis; Ryan, Assumpta A

    2014-11-01

    This study explored the experiences of sons caring for a parent with dementia. Individual, semi-structured interviews were conducted with a purposeful sample of sons (n = 13) in a rural part of Ireland. Interviews were audiotaped, transcribed verbatim and analysed for common themes. The key themes that emerged were 'the parental bond', 'a binding role', 'coordinating care and support' and a 'getting on with it' approach to care. The study highlighted the commitment of sons to their caregiving role and the strong sense of duty that motivated them to provide care. The findings suggested that while many aspects of the caregiving experience such as lack of information and support are gender neutral, there are differences in the caregiving experiences of men and women in how they view their relationship with their parent and in the management of their caregiving role that merit further investigation. © The Author(s) 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

  8. De Novo Truncating Variants in SON Cause Intellectual Disability, Congenital Malformations, and Failure to Thrive.

    Science.gov (United States)

    Tokita, Mari J; Braxton, Alicia A; Shao, Yunru; Lewis, Andrea M; Vincent, Marie; Küry, Sébastien; Besnard, Thomas; Isidor, Bertrand; Latypova, Xénia; Bézieau, Stéphane; Liu, Pengfei; Motter, Connie S; Melver, Catherine Ward; Robin, Nathaniel H; Infante, Elena M; McGuire, Marianne; El-Gharbawy, Areeg; Littlejohn, Rebecca O; McLean, Scott D; Bi, Weimin; Bacino, Carlos A; Lalani, Seema R; Scott, Daryl A; Eng, Christine M; Yang, Yaping; Schaaf, Christian P; Walkiewicz, Magdalena A

    2016-09-01

    SON is a key component of the spliceosomal complex and a critical mediator of constitutive and alternative splicing. Additionally, SON has been shown to influence cell-cycle progression, genomic integrity, and maintenance of pluripotency in stem cell populations. The clear functional relevance of SON in coordinating essential cellular processes and its presence in diverse human tissues suggests that intact SON might be crucial for normal growth and development. However, the phenotypic effects of deleterious germline variants in SON have not been clearly defined. Herein, we describe seven unrelated individuals with de novo variants in SON and propose that deleterious variants in SON are associated with a severe multisystem disorder characterized by developmental delay, persistent feeding difficulties, and congenital malformations, including brain anomalies. Copyright © 2016 American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

  9. SON connects the splicing-regulatory network with pluripotency in human embryonic stem cells.

    Science.gov (United States)

    Lu, Xinyi; Göke, Jonathan; Sachs, Friedrich; Jacques, Pierre-Étienne; Liang, Hongqing; Feng, Bo; Bourque, Guillaume; Bubulya, Paula A; Ng, Huck-Hui

    2013-10-01

    Human embryonic stem cells (hESCs) harbour the ability to undergo lineage-specific differentiation into clinically relevant cell types. Transcription factors and epigenetic modifiers are known to play important roles in the maintenance of pluripotency of hESCs. However, little is known about regulation of pluripotency through splicing. In this study, we identify the spliceosome-associated factor SON as a factor essential for the maintenance of hESCs. Depletion of SON in hESCs results in the loss of pluripotency and cell death. Using genome-wide RNA profiling, we identified transcripts that are regulated by SON. Importantly, we confirmed that SON regulates the proper splicing of transcripts encoding for pluripotency regulators such as OCT4, PRDM14, E4F1 and MED24. Furthermore, we show that SON is bound to these transcripts in vivo. In summary, we connect a splicing-regulatory network for accurate transcript production to the maintenance of pluripotency and self-renewal of hESCs.

  10. THE USE OF POLARIZATION EFFECTS IN SEMICONDUCTOR OPTICAL AMPLIFIERS TO PERFORM ALL-OPTICAL SIGNAL PROCESSING EL USO DE EFECTOS DE POLARIZACIÓN EN AMPLIFICADORES ÓPTICOS SEMICONDUCTORES PARA REALIZAR EL PROCESAMIENTO DE SEÑALES EN EL DOMINIO ÓPTICO

    Directory of Open Access Journals (Sweden)

    Brendan F Kennedy

    2007-12-01

    Full Text Available As the need for higher and higher bandwidths in telecommunication systems continues, it is widely predicted that at some point in the future optical processing will need to be performed all-optically. Several techniques have been proposed to perform such all-optical signal processing. In this paper a technique based on the nonlinear rotation in the state of polarization of an optical signal injected into a bulk semiconductor optical amplifier is discussed. An experiment to perform wavelength conversion at 2.5 Gbit/s based on this effect is presented. The performance of the wavelength converter is tested in both co- and counter-propagation, and wavelength independent wavelength conversion is found in the non-inverted co-propagation setup.En los servicios de telecomunicaciones, la necesidad de hacer uso intensivo de las aplicaciones ha presionado por un constante incremento del ancho de banda. Particularmente una de las tecnologías más promisorias, que ha permitido estos incrementos de ancho de banda, son los elementos ópticos, de tal manera que en las redes de comunicación los elementos electrónicos sean sustituidos por dichos elementos ópticos. En esta publicación se discute una técnica basada en la rotación no lineal del estado de polarización de una señal óptica conectada al amplificador semiconductor óptico. Se presenta un experimento, basado en este efecto, para realizar la conversión a 2,5 Gbits/s. La característica del conversor de longitud onda es probada en propagación directa e inversa. Se ha encontrado que conversión de la longitud de onda es independiente de longitud de onda (la conversión no depende del valor de la longitud de onda en la modalidad de propagación directa no invertida.

  11. Risk of cryptorchidism among sons of horticultural workers and farmers in Denmark

    DEFF Research Database (Denmark)

    Jørgensen, Kristian Tore; Jensen, Morten Søndergaard; Toft, Gunnar Vase

    2014-01-01

    on occupation and cryptorchidism. METHODS: The cohort consisted of >600 000 boys born in Denmark from 1980-2007 with a parent in employment during pregnancy. These boys were followed for cryptorchidism from 1980-2009 comparing risks among sons of horticultural workers and farmers with sons of parents in other...... occupations. Hazard ratios (HR) and 95% confidence intervals (95% CI) were estimated using Cox regression adjusting for parental age, birth years, parity, and geographical region. RESULTS: Sons of maternal farmers were at increased risk of cryptorchidism (157 cases; HR 1.31, 95% CI 1.12-1.53) compared to boys...... of mothers in other occupations (15 511 cases). Paternal occupation as farmer was unrelated to the risk among sons. Maternal occupation as a horticultural worker was associated with a non-significantly increased risk (72 cases; HR 1.20, 95% CI 0.95-1.52). A similar association was found for paternal...

  12. Travailler loin de son domicile

    OpenAIRE

    Bonnet, Estelle; Verley, Elise; Ries, Tammy

    2017-01-01

    Résumé : La mobilité géographique liée à un lieu de travail éloigné du domicile – supposant soit de longs trajets quotidiens, soit de dormir en dehors du domicile – s’inscrit à l’articulation de la sphère professionnelle et de la sphère privée. Elle met à l’épreuve le couple et la distribution des rôles sexués en son sein. Cet article interroge les divisions sexuées inhérentes à cette articulation selon que l’on se place du point de vue d’une mobilité féminine ou masculine. Il examine en quoi...

  13. Das ondas que se fizeram mar em Rio Grande : a construção de um projeto de educação ambiental no entrelaçamento das trajetórias de vida dos seus autores

    OpenAIRE

    Vinícius Lima Lousada

    2006-01-01

    Este trabalho apresenta um estudo sobre a proposta de Educação Ambiental (EA) Ondas que te quero mar, desenvolvida pelo Núcleo de Educação e Monitoramento Ambiental, na cidade do Rio Grande/RS, para a Rede Pública de Ensino Municipal, articulado com as trajetórias de vida de seus autores, onde procuro demonstrar essa conexão no quefazer metodológico dessa proposta. As reflexões aqui expostas baseiam-se em referenciais teóricos sobre Educação, Educação Ambiental e Pesquisa Social, sendo a maio...

  14. African-American Fathers' Perspectives on Facilitators and Barriers to Father-Son Sexual Health Communication.

    Science.gov (United States)

    Randolph, Schenita D; Coakley, Tanya; Shears, Jeffrey; Thorpe, Roland J

    2017-06-01

    African-American males ages 13 through 24 are disproportionately affected by sexually transmitted infections (STIs) and human immunodeficiency virus (HIV), accounting for over half of all HIV infections in this age group in the United States. Clear communication between African-American parents and their youth about sexual health is associated with higher rates of sexual abstinence, condom use, and intent to delay initiation of sexual intercourse. However, little is known about African-American fathers' perceptions of what facilitates and inhibits sexual health communication with their preadolescent and adolescent sons. We conducted focus groups with 29 African-American fathers of sons ages 10-15 to explore perceived facilitators and barriers for father-son communication about sexual health. Participants were recruited from barbershops in metropolitan and rural North Carolina communities highly affected by STIs and HIV, and data were analyzed using content analysis. Three factors facilitated father-son communication: (a) fathers' acceptance of their roles and responsibilities; (b) a positive father-son relationship; and (c) fathers' ability to speak directly to their sons about sex. We also identified three barriers: (a) fathers' difficulty in initiating sexual health discussions with their sons; (b) sons' developmental readiness for sexual health information; and (c) fathers' lack of experience in talking with their own fathers about sex. These findings have implications for father-focused prevention interventions aimed at reducing risky sexual behaviors in adolescent African-American males. © 2017 Wiley Periodicals, Inc. © 2017 Wiley Periodicals, Inc.

  15. Aditivos alimentarios: ¿qué son, cómo actúan, por qué son tan necesarios?

    OpenAIRE

    Blanco de Alvarado-Ortiz, Teresa

    2014-01-01

    Para John M. deMan, en su obra PrincipIes of Food Chemistry a los aditivos alimentarios con frecuencia se les asocia a algo químico, otorgándose erradamente a lo quimico características de artificial, no siempre bueno para la salud.Dicen bien erradamente, porque hombres, animales, plantas, microorganismos, alimentos, aire, cerros, minas y todo lo que nos rodea en la maravillosa naturaleza, es químico. Los aditivos alimentarios,todos químicos, naturales o artificiales son extraordinarias susta...

  16. Distrofia retiniana com onda rápida escotópica (DRORE associada à síndrome dos cabelos anágenos frouxos (SCAF. Parte II: Genética Scotopic fast wave retinal dystrophy (SFWRD associated with loose anagen hair syndrome (LAHS. Part II: Genetics

    Directory of Open Access Journals (Sweden)

    Mário Teruo Sato

    2004-08-01

    Full Text Available OBJETIVOS: Propor complementação da atual classificação do eletrorretinograma (ERG com a inclusão deste novo tipo de onda, discutir os possíveis mecanismos para a distrofia retiniana com onda rápida escotópica (DRORE associada à síndrome dos cabelos anágenos frouxos (SCAF e análise do heredograma da família estudada. MÉTODO: Foram descritos na parte I deste trabalho. RESULTADOS: A análise do heredograma da família demonstrou tratar-se de herança autossômica recessiva com expressão parcial no heterozigoto; outros resultados foram descritos na parte I deste trabalho. CONCLUSÕES: Por se tratar do primeiro relato na literatura, os achados descritos sugerem fortemente que a distrofia retiniana com onda rápida escotópica associada à síndrome dos cabelos anágenos frouxos pode ser uma nova entidade nosológica. Neste trabalho propomos uma classificação inédita de todas as distrofias maculares e degenerações retinianas associadas a distúrbios capilares no grupo B das displasias ectodérmicas.PURPOSE: To propose the complementation of present classification of the electroretinogram (ERG with the inclusion of this new kind of wave, to discuss the possible mechanisms for the scotopic fast wave retinal dystrophy (SFWRD associated with the loose anagen hair syndrome (LAHS and to analyze the pedigree of the studied family. METHODS: Were described in part I of this study. RESULTS: The pedigree analysis of the family showed to be an autosomal recessive form of inheritance with partial expression in the heterozygote; other results were described in part I of this study. CONCLUSION: Being the first account in the literature, the described finding strongly suggests that scotopic fast wave retinal dystrophy associated with the loose anagen hair syndrome can be a new nosological entity. In this study, we propose an unpublished classification of all macular dystrophies and retinal degenerations associated with hair disorders in group B

  17. Impaired Reproductive Development in Sons of Women Occupationally Exposed to Pesticides during Pregnancy

    DEFF Research Database (Denmark)

    Andersen, Helle Raun; Schmidt, Ida M.; Grandjean, Philippe

    2008-01-01

    OBJECTIVES: The aim of this prospective study was to investigate whether occupational pesticide exposure during pregnancy causes adverse effects on the reproductive development in the male infants. DESIGN AND MEASUREMENTS: Pregnant women employed in greenhouses in Denmark were consecutively...... recruited, and 113 mother-son pairs were included. The mothers were categorized as occupationally exposed (91 sons) or unexposed (22 sons) to pesticides during pregnancy. Testicular position and volume, penile length, and position of urethral opening were determined at 3 months of age using standardized...

  18. Disability in the Family: John and Alice Dewey Raising Their Son Sabino

    Science.gov (United States)

    Danforth, Scot

    2018-01-01

    Background/Context: The current biographic understanding of John Dewey's experience adopting and raising an Italian boy named Sabino emphasizes the theme of finding an emotional replacement for Morris and Gordon, two young sons who had tragically died on family trips to Europe. Lacking is substantive attention to the fact that John Dewey's son had…

  19. The Telephone Connection: An Interview with Ernest Hemingway's Son.

    Science.gov (United States)

    Workman, Brooke

    1979-01-01

    Relates how a conference call to Ernest Hemingway's son, Gregory, resolved questions and brought understanding and excitement to a group of Iowa high school students enrolled in a 12-week Hemingway seminar. (FL)

  20. Reproductive Rights and Son Preference in India : Mobilizing ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    This project is concerned with two overlapping manifestations of gender inequality in India : limited access to reproductive rights on the one hand, and practices associated with son preference on the other. Work that brings together these two issues is urgently needed, particularly in the context of declining funding for ...

  1. Short-lived radiopharmaceutical development at E.R. Squibb and Sons, Inc

    International Nuclear Information System (INIS)

    Loberg, M.D.

    1985-01-01

    This paper describes the present status and future plans of E.R. Squibb and Sons, Inc. as they relate to the development of short-lived radiopharmaceuticals. The advantages of short-lived radiopharmaceuticals are summarized as are the problems inherent in their manufacture, quality control, and distribution. The nuclear generator is advocated as the best means of distributing short-lived radiopharmaceuticals. The E.R. Squibb and Sons work with the 82 Sr → 82 Rb generator is summarized

  2. La aproximación topológica en el cálculo de orbitales moleculares localizados.

    OpenAIRE

    Paniagua, Juan Carlos

    1983-01-01

    [spa] Es bien sabido que cualquier función de onda que se exprese como determinante de Slater construido a partir de orbitales moleculares doblemente ocupados es invariante frente a transformaciones unitarias de dichos orbitales. Aunque las posibilidades de elección son ilimitadas, en la práctica sólo se utilizan dos tipos de orbitales: los canónicos y los localizados. Los primeros se caracterizan por ser funciones propias de algún hamiltoniano monoelectrónico efectivo y entre sus propieda...

  3. Sobre sete ondas verdes espumantes: diálogos entre estética poética, road movie, literatura e memória afetiva no documentário brasileiro contemporâneo = Sobre sete ondas verdes espumantes: dialogues between poetic aesthetics, road movie, literature and afective memory in contemporary brazilian documentary

    Directory of Open Access Journals (Sweden)

    Pereira, Dieison Marconi

    2015-01-01

    Full Text Available Neste artigo, investiga-se as relações entre estética poética, road movie, memória e dialogismo cinematográfco literário no documentário brasileiro contemporâneo, mediante a análise fílmica do longa-metragem Sobre sete ondas verdes espumantes. Dirigido por Bruno Polidoro e Cacá Nazário (2013, o documentário é um road movie poético construído através da vida e obra do escritor Caio Fernando Abreu. Nos interessa, então, compreender de que maneira todas essas experimentações narrativas dialogam entre si a fim de figurar um Caio Fernando Abreu extremamente próximo de sua literatura e como se dá a construção do lugar de memória poética, literária e afetiva. Também nos interessa investigar como o presente filme aponta para um documentarismo que não se prende às formas gastas e tradicionais de se produzir um filme de não ficção

  4. L'astronomie et son histoire

    CERN Document Server

    Roy, Jean-René

    1982-01-01

    Le livre de Jean-René Roy nous présente une vaste synthèse des connaissances présentes en astronomie. Le grand mérite du livre est de dérouler son sujet en parallèle avec une histoire de l'astronomie. Le côté historique est ici beaucoup plus qu'un luxe. Il redonne leurs dimensions vraies aux réponses qu'apporte l'astronomie. Pour bien sentir la nature d'une étape franchie, il faut aussi avoir vécu la situation telle qu'elle se présentait avant. Et les fiches personnelles incluses dans le livre ont l'intérêt de nous rapprocher encore plus du "" feu de l'action "". Écrit dans un style direct et

  5. Romancero y folclor

    Directory of Open Access Journals (Sweden)

    Helcías Martán Góngora

    1965-05-01

    Full Text Available La copla viajera no ha menester pasaporte ni reconoce otra frontera que aquella que el idioma le opone. Para el cantar anónimo no existen las distancias, cuando traspone mar es y cruza continentes en alas de la música. Si en el camino se detiene la estrofa, es para remozarse con el ropaje de cada pueblo, reclamar carta de ciudadanía e incorporarse al tesoro de la tradición oral.

  6. The institutionalization of Jesus' charismatic authority: "Son of Man" as case study1

    OpenAIRE

    Yolanda Dreyer

    2000-01-01

    This article argues that Jesus used the expression "son of man" not in a titular way, but genetically, meaning "humankind". This use of "son of man" developed into a titular usage in which Jesus is identified with "Son of Man". The study shows that Jesus' use of the expression "son of man" should be understood in the context of the "little tradition" which was reinterpreted in terms of the "great tradition" in a titular way. It is argued that this transition from "litle tradition" to "great t...

  7. Types of sons/siblings, fraternal function and peers

    Directory of Open Access Journals (Sweden)

    Luisa Brunori

    2013-12-01

    Full Text Available In this article, the author starts by exploring family dynamics using the psychodynamic-groupanalytic paradigm to explore the intertwined relationships amongst the family figures like son, daughter, parents and sibling. The work focuses on the analysis of the psychological aspects related to siblings in the family, birth order and their consequences.

  8. Girl adoption in China-A less-known side of son preference.

    Science.gov (United States)

    Chen, Yuyu; Ebenstein, Avraham; Edlund, Lena; Li, Hongbin

    2015-01-01

    In 1987, 4 per cent of girls were adopted within China. Why? Unlike infanticide, abandonment rids parents of daughters while preserving the supply of potential brides. In fact, an erstwhile tradition common in Fujian and Jiangxi provinces had parents of sons adopting an infant girl to serve as a future daughter-in-law and household help. Analysing a nationally representative 1992 survey of children, we found that: (1) girl adoptions were concentrated in the above-mentioned provinces; (2) girls were predominantly adopted by families with sons; (3) adopted girls faced substantial disadvantage as measured by school attendance at ages 8-13. In the 1990s, as the sex ratio at birth climbed, were girls aborted rather than abandoned? Observing that in the 2000 census too many girls appear in families with older sons, we estimated that at least 1/25 girls were abandoned in the 1990s, a proportion that in Fujian and Jiangxi may have peaked at 1/10 in 1994.

  9. Classification of voltage sags according to the severity of the effects on the induction motor

    Directory of Open Access Journals (Sweden)

    Adolfo Andrés Jaramillo-Matta

    2015-01-01

    Full Text Available En este artículo se clasifican los huecos de tensión simétricos y asimétricos de acuerdo a la severidad de sus efectos sobre el comportamiento de los motores de inducción, utilizando el modelo de doble jaula. Las variables analizadas son: picos de corriente y par, y pérdida de velocidad en régimen transitorio y en estado estable. La severidad de estos efectos se analiza con 14640 huecos, tanto al inicio del hueco como cuando se recupera la tensión, cambiando su tipo, magnitud, duración y punto de onda inicial. Para el análisis se utilizaron tres cargas de par mecánico con comportamiento constante y una carga con comportamiento cuadrático. Los resultados muestran las duraciones y los puntos de la onda inicial que tienen efectos más severos para cada tipo de hueco. Finalmente se obtiene una clasificación que depende tanto del tipo de hueco como de la variable de interés.

  10. Reliability of P mode event classification using contemporaneous BiSON and GOLF observations

    International Nuclear Information System (INIS)

    Simoniello, R; Chaplin, W J; Elsworth, Y P; Garcia, R A

    2008-01-01

    We carried out a comparison of the signals seen in contemporaneous BiSON and GOLF data sets. Both instruments perform Doppler shift velocity measurements in integrated sunlight, although BiSON perform measurements from the two wings of potassium absorption line and GOLF from one wing of the NaD1 line. Discrepancies between the two datasets have been observed. We show,in fact, that the relative power depends on the wing in which GOLF data observes. During the blue wing period, the relative power is mugh higher than in BiSON datasets, while a good agreement has been observed during the red period.

  11. Major ion chemistry of the Son River, India

    Indian Academy of Sciences (India)

    The chemistry of major ions in the surface water of the Son River was studied in detail to determine various source(s) and processes controlling its water chemistry, seasonal and spatial variations in water chemistry, dissolved fluxes and chemical denudation rate (CDR). The study shows that Ca2+, Mg2+ and HCO 3 − are ...

  12. Breaking the ice! Predictors about communication between nonresident African American fathers and sons about sex.

    Science.gov (United States)

    Burns, Jade C; Caldwell, Cleopatra H

    2016-02-01

    Research on communication between resident and nonresident African American fathers and their sons about sex has been understudied. The purpose of this study is to determine the influence of parenting variables, specifically, racial socialization and father involvement on nonresident African American father-son communication about sex. Data for this study are from the Fathers and Sons Project. This intervention study is designed to enhance relationships between nonresident African American fathers and their 8-12 year old sons and to prevent risky health behaviors among sons. The present study is based on 345 African American boys who completed baseline face-to-face interviews. The average age of the sons was 10.2 years old (SD = 1.4), with an average of two siblings (SD = 1.53). Age and sons' perceptions of more parental monitoring by their fathers were predictive of increased communication about sex. Racial socialization messages explained additional variance in communication about sex above other parenting variables and controls. Findings suggest when working with African American families, providers who counsel parents, and in particular provide outreach to fathers regarding communication about sex, are in a unique position to enhance parenting communication skills about sexuality. ©2015 American Association of Nurse Practitioners.

  13. Associations Between Fathers' and Sons' Sexual Risk in Rural Kenya: The Potential for Intergenerational Transmission.

    Science.gov (United States)

    Giusto, Ali M; Green, Eric P; Puffer, Eve S

    2017-08-01

    Despite high rates of HIV in areas of Sub-Saharan Africa and men's role in driving the epidemic, little is known about whether or how sexual risk-both behaviors and beliefs-may be passed down through generations of males. This study examined associations between sexual risk behaviors and sex-related beliefs of adolescent males and those of their male caregivers in Kenya, as well as the potential moderating effects of parenting characteristics and father-son relationship quality. Cross-sectional linear regression analysis was applied to baseline data from a trial of a family- and church-based intervention for families in rural Kenya that followed a stepped-wedge cluster randomized design. Our subsample consisted of 79 male caregiver and son (aged 10-16 years) dyads. Results demonstrated a direct relationship between fathers' and sons' sex-related beliefs that was not moderated by parenting or quality of father-son relationship. Parenting/relationship characteristics did moderate the relationship between fathers' and sons' sexual behavior; if fathers did not engage in high-risk sex and exhibited more positive parenting/higher relationship quality, their sons were less likely to be sexually active. Among fathers having high-risk sex, parenting was unrelated to sons' behavior except at very high levels of positive parenting/relationship quality; at these levels, sons were actually more likely to have had sex. Findings support recommendations to include male caregivers in youth HIV prevention efforts, potentially by targeting fathers' parenting strategies and their individual risk. Copyright © 2017 Society for Adolescent Health and Medicine. Published by Elsevier Inc. All rights reserved.

  14. Has Their Son Been Vaccinated? Beliefs About Other Parents Matter for Human Papillomavirus Vaccine.

    Science.gov (United States)

    Schuler, Christine L; Coyne-Beasley, Tamera

    2016-07-01

    The goal of this study was to determine if parents' beliefs about social norms of human papillomavirus (HPV) vaccination for sons were associated with knowledge of HPV, intention to vaccinate sons, or beliefs about side effects. A cross-sectional, survey-based study of parents with sons was performed in 2010. Fisher's exact tests were used to examine associations between demographics and responses about social norms. Multivariate logistic regression models examined beliefs about social norms of male HPV vaccination and primary outcomes. Few parents agreed that others were vaccinating sons (n = 31/267, 12%), including 1% responding strongly agree and 11% responding agree. Most parents, 52%, disagreed that others were vaccinating (40% disagree, 11% strongly disagree), and 37% chose prefer not to answer regarding others' vaccination practices. Hispanic parents and those with a high school education or less were significantly more likely to choose prefer not to answer than their respective counterparts regarding vaccination norms. In multivariate models, parents agreeing others were vaccinating sons had greater odds of having high knowledge of HPV (adjusted odds ratio [aOR] high vs low knowledge 3.15, 95% confidence interval [CI] 1.13, 8.77) and increased intention to vaccinate sons (n = 243, aOR = 4.41, 95% CI = 1.51, 12.89). Beliefs about side effects were not significantly associated with beliefs about social norms. Parents' beliefs about others' vaccination practices are important with regard to knowledge of HPV and intention to vaccinate sons. Studying how various public messages about HPV vaccine may influence normative beliefs could be relevant to improving vaccination coverage. © The Author(s) 2015.

  15. Ensino de Física para surdos: um experimento mecânico e um eletrônico para o ensino de ondas sonoras

    Directory of Open Access Journals (Sweden)

    Deise Benn Pereira Vivas

    2017-05-01

    Full Text Available Este trabalho se insere na temática sobre o papel das Tecnologias Assistivas na compreensão conceitual e na promoção da inserção social de estudantes surdos. São apresentadas duas versões (mecânica e eletrônica de um experimento didático desenvolvido pelos autores para o ensino de ondas sonoras, voltado primordialmente para estudantes surdos do Ensino Médio. Inicialmente, é feito um breve histórico da educação para surdos desde a antiguidade, seguida de uma discussão teórica sobre a física da voz. Na sequência, são apresentadas as duas versões do experimento com seus detalhes técnicos e o processo de elaboração dos mesmos, bem como, uma discussão teórica acerca de uma perspectiva para uso didático destes experimentos, orientado por uma visão vigotskiana. Ao final, são feitas considerações acerca do potencial uso didático do experimento visando a inclusão dos alunos surdos em classes regulares, visto que se trata de experimentos ainda não avaliados em situações reais de sala de aula.

  16. Lo que está bajo nuestros pies

    Directory of Open Access Journals (Sweden)

    Paula C. de A. Maria Castelhano

    2011-01-01

    Full Text Available En este trabajo se pretende demostrar cómo el estudio del comportamiento de las ondas sísmicas llevó a la construcción del modelo físico de la estructura interna de la Tierra en diferentes capas concéntricas. Los modelos analógicos en educación de la ciencias son instrumentos esenciales que hacen los conocimientos científicos más comprensible, facilitando la comprensión de conceptos abstractos y favoreciendo así el interés de los estudiantes.

  17. What is under our feet;

    Directory of Open Access Journals (Sweden)

    Castelhano, Paula C. de A. Maria

    2011-11-01

    Full Text Available En este trabajo se pretende demostrar cómo el estudio del comportamiento de las ondas sísmicas llevó a la construcción del modelo físico de la estructura interna de la Tierra en diferentes capas concéntricas. Los modelos analógicos en educación de la ciencias son instrumentos esenciales que hacen los conocimientos científicos más comprensible, facilitando la comprensión de conceptos abstractos y favoreciendo así el interés de los estudiantes.

  18. Studies and integration of Silicon-based light emitting systems

    OpenAIRE

    González Fernández, Alfredo A.

    2014-01-01

    [spa] Este proyecto aborda el estudio de dispositivos y materiales luminiscentes basados en silicio para su uso en la fabricación de un sistema óptico que integre emisor de luz, guía de ondas, y sensor en un solo chip obtenido mediante el uso de técnicas y materiales estándar para la fabricación CMOS. Las características atómicas y estructurales de los materiales son analizados y relacionados con su respuesta luminiscente. Considerando los resultados de la caracterización del material a...

  19. Aproximación topológica en el cálculo de orbitales moleculares localizados, La

    OpenAIRE

    Paniagua Valle, Juan Carlos

    1983-01-01

    Es bien sabido que cualquier función de onda que se exprese como determinante de Slater construido a partir de orbitales moleculares doblemente ocupados es invariante frente a transformaciones unitarias de dichos orbitales.Aunque las posibilidades de elección son ilimitadas, en la práctica sólo se utilizan dos tipos de orbitales: los canónicos y los localizados. Los primeros se caracterizan por ser funciones propias de algún hamiltoniano monoelectrónico efectivo y entre sus propiedades más in...

  20. Evaluación de herramientas de simulación y estudio de las preferencias del color en daltónicos dicrómatas

    OpenAIRE

    Álvaro Llorente, Leticia

    2016-01-01

    Los observadores con visión normal del color (tricrómatas normales) poseen tres tipos de conos retinianos, que responden máximamente a las longitudes de onda larga (conos L), media (M) y corta (S). Los dicromatismos rojo-verde son alteraciones genéticas de la visión del color en las que, aparte del fotopigmento presente en los conos S, únicamente existe otro tipo de fotopigmento, el que contienen los conos L (deuteranopia) o M (protanopia). Afectan a un 2% de los varones y conllevan una discr...

  1. The rise of the daughter-in-law: Why son preference is weakening in ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    2012-11-13

    Nov 13, 2012 ... Millions of women are 'missing' because they die in much larger ... This means that the population of Bangladesh, along with that of India and Pakistan, ... Sons, on the other hand, were considered insurance against poverty in old age. ... sons would defy child mortality rates to look after their aged parents.

  2. La croissance demographique et son impact sur le developpement ...

    African Journals Online (AJOL)

    La croissance demographique et son impact sur le developpement des grandes villes au ... La ville de Porto-Novo au Bénin n'est pas en marge de cette réalité que ... and the need for improving its framework of life through its development.

  3. Data mining to estimate broiler mortality when exposed to heat wave Mineração de dados e estimativa da mortalidade alta de frangos quando expostos a onda de calor

    Directory of Open Access Journals (Sweden)

    Marcos Martinez Vale

    2008-01-01

    Full Text Available Heat waves usually result in losses of animal production since they are exposed to thermal stress inducing an increase in mortality and consequent economical losses. Animal science and meteorological databases from the last years contain enough data in the poultry production business to allow the modeling of mortality losses due to heat wave incidence. This research analyzes a database of broiler production associated to climatic data, using data mining techniques such as attribute selection and data classification (decision tree to model the impact of heat wave incidence on broiler mortality. The temperature and humidity index (THI was used for screening environmental data. The data mining techniques allowed the development of three comprehensible models for estimating specifically high mortality during broiler production. Two models yielded a classification accuracy of 89.3% by using Principal Component Analysis (PCA and Wrapper feature selection approaches. Both models obtained a class precision of 0.83 for classifying high mortality. When the feature selection was made by the domain experts, the model accuracy reached 85.7%, while the class precision of high mortality was 0.76. Meteorological data and the calculated THI from meteorological stations were helpful to select the range of harmful environmental conditions for broilers 29 and 42 days old. The data mining techniques were useful for building animal production models.As ondas de calor provocam perdas na produção animal pela sua exposição ao estresse por calor aumentando a mortalidade, e consequentemente, perdas econômicas. Bancos de dados zootécnicos e meteorológicos históricos podem conter informações que permitem modelar a mortalidade de frangos devido à incidência de ondas de calor. O objetivo foi analisar bancos de dados de frangos de corte associados a dados meteorológicos utilizando técnicas de mineração de dados, seleção de atributos e classificação (

  4. Andrew Wyeth and N.C. Wyeth: a psychodynamic perspective on father and son.

    Science.gov (United States)

    Shaw, Jon A

    2013-01-01

    This paper examines the relationship between two extraordinary artists, father and son--N.C. Wyeth (1882-1945) and Andrew Wyeth (1917-2009)--and their art. N.C. Wyeth, the father, the most famous illustrator of his day, painted scenes full of drama and action, often of men engaged in violent life and death struggles. N.C. was unable to separate from his powerful mother and yearned for his iconic father. He thought himself an artistic failure and dedicated himself to raising his children to be geniuses. The youngest son, Andrew Wyeth, who lived a "secret life," painted scenes often characterized by pathos: bleak and barren landscapes, leaden skies, tire tracks, gray framed houses, desiccated fields, and circling buzzards. In the father-son relationship, we often seen three themes perpetuated developmentally: (1) the son's identification with the innermost conflicts of his father; (2) the yearning for the iconic father of his youth; and (3) a continuation and disavowal of his father's life. These themes are played out in the relationship between Andrew Wyeth and his father.

  5. UV-vis in situ spectrometry data mining through linear and non linear analysis methods

    Directory of Open Access Journals (Sweden)

    Liliana López-Kleine

    2014-01-01

    Full Text Available Los espectrómetros UV-visibles son captores que registran la absorbancia de luz emitida por partículas suspendidas en el agua a diferentes longitudes de onda y proporcionan mediciones en continuo, las cuales pueden ser interpretadas como concentraciones de parámetros comúnmente usados para evaluar el estado físico-químico de cuerpos de agua. Parámetros clásicos usados para detectar la presencia de contaminación en el agua son los sólidos suspendidos totales (TSS y la demanda química de oxígeno (CDO. Métodos de análisis flexibles y eficientes son necesarios para extraer información útil para fines de gestión y monitoreo a partir de los datos multivariados que proporcionan los captores. Se han usado métodos de calibración de tipo regresión parcial por mínimos cuadrados parciales (PLS. Varios autores han demostrado la necesidad de realizar la calibración para cada tipo de datos y cada cuerpo de agua, así como explorar métodos de análisis lineales y no lineales para el análisis de datos UV-visible y para determinar su relación con parámetros clásicos. En este trabajo se aplican métodos de análisis multivariado lineales y no lineales para la minería de datos UV-vis de alta dimensión, los cuales resultan útiles para la identificación de relaciones entre parámetros y longitudes de onda, la detección de muestras atípicas, así como la detección de estructuras no lineales en los datos.

  6. Análise dos traçados de ondas da agregação plaquetária em pacientes com doenças cardiovasculares em uso do ácido acetil salicílico comparados a doadores de sangue Analysis of the waves and aggregation patterns in patients with cardiovascular diseases in using acetylsalicylic acid compared blood donors

    Directory of Open Access Journals (Sweden)

    Patrícia S. M. Bernardi

    2004-12-01

    Full Text Available A agregação plaquetária avalia a função das plaquetas através de diferentes vias de ativação plaquetária in vitro, fornecendo traçados de ondas equivalentes à propriedade física dessa agregação. Sabendo-se que a aspirina acetila irrever­sivelmente a enzima cicloxigenase prevenindo a geração de tromboxana A2, potente ativador da agregação plaquetária, esta droga tem sido analisada há mais de trinta anos na clínica médica em pacientes com doenças cardiovasculares como uma potente droga antitrombótica. Foram nossos objetivos obter traçados de ondas correspondentes às fases da agregação plaquetária para nossa padronização utilizando nosso grupo controle de doadores de sangue e compará-las com nosso grupo estudo, frente a diferentes agentes agonistas em diferentes concentrações: ADP 1µM e 3µM; AA, 0,5mM; ADR, 0,05 mg/mL, 0,025 mg/mL e 0,010 mg/mL. Os grupos analisados foram constituídos por 41 cardíacos e 40 doadores de sangue considerados controle. Dos cardíacos, 33 faziam uso regular do AAS na concentração de 200 mg/dia e oito na concentração de 100 mg/dia, sendo todos considerados hipertensos. A padronização da agregometria estava na dependência do encontro de traçados correspondentes a ondas de agregação, sendo esses obtidos em porcentagem no tempo de cinco minutos estandartizados pelo aparelho utilizado. Comparando os resultados entre os pacientes e o grupo controle, foi possível observar que, na presença dos agentes agregantes ADP 1µM e ADP 3 µM, ADR 0,05 mg/mL, 0,025mg/mL e 0,010 mg/mL, os pacientes apresentaram 1ª onda, mas não 2ª onda. Por sua vez, no caso do AA 0,5 mM não houve o encontro de traçados de ondas.Platelet aggregation illustrates the function of the platelets by different ways of in vitro platelet activation providing wave traces equivalent to the physical proprieties of this aggregation. It is well known that aspirin irreversibly blocks the cyclooxygenase enzyme

  7. Older Parents Benefit More in Health Outcome From Daughters' Than Sons' Emotional Care in China.

    Science.gov (United States)

    Zeng, Yi; Brasher, Melanie Sereny; Gu, Danan; Vaupel, James W

    2016-12-01

    To examine whether older parents in China would benefit more from daughters' care than from sons' emotional care. Analysis of the unique data sets of the Chinese Longitudinal Healthy Longevity Survey conducted in 2002, 2005, and 2008-2009 in 22 provinces. As compared with having son(s), having daughter(s) is significantly more beneficial at older ages in China, with regard to maintaining higher cognitive capacity and reducing mortality risk. Such daughter advantages in providing emotional care to older parents are more profound among the oldest-old aged 80+ as compared with the young-old aged 65 to 79 and surprisingly more profound in rural areas as compared with urban areas, even though son preference is much more common among rural residents. We describe how educational campaigns aimed at informing the public about the benefits of daughter(s) for older parents' health outcome could help promote gender equality and reduce traditional son preference, especially in rural China.

  8. The Son Jarocho and Fandango Amidst Struggle and Social Movements: Migratory Transformation and Reinterpretation of the Son Jarocho in La Nueva Espa�a, M�xico, and the United States

    OpenAIRE

    Hern�ndez, Alexandro David

    2014-01-01

    This dissertation is a study on the son jarocho and its fandango as a migratory and transformative musical culture between nations and social circumstances. The son jarocho embodies tradition in many cultural practices of society, such as its presence at social rites and at fandangos. However, there exist hidden histories, transcripts of resistance not accounted for in M�xico's official history, of the son jarocho as music of struggle and protest. From censorship, punishment, and imprisonme...

  9. SON68 glass alteration enhanced by magnetite

    Energy Technology Data Exchange (ETDEWEB)

    Godon, Nicole; Gin, Stephane; Rebiscoul, Diane; Frugier, Pierre [CEA, DEN-Marcoule, F30207, Bagnols-sur-Ceze (France)

    2013-07-01

    This paper reports experimental and modeling results of SON68 glass / magnetite interactions while in contact with synthetic groundwater from a clay environment. It is shown that magnetite enhances glass alteration, first by the sorption of Si released from the glass onto magnetite surfaces, then by a second process that could be the precipitation of an iron silicate mineral or the transformation of magnetite into a more reactive phase like hematite or goethite. This study globally suggests a detrimental effect of magnetite on the long-term durability of nuclear glass in geological disposal conditions. (authors)

  10. Supresión de modos de vibración acústicos con un resonador Helmholtz

    Directory of Open Access Journals (Sweden)

    Guiguet Andrés

    2003-01-01

    Full Text Available La inserción de un Resonador Helmholtz (RH en las paredes laterales de un tubo, con ondas estacionarias en su interior, logra suprimir uno o más de sus modos resonantes si se elige adecuadamente la frecuencia del resonador. El RH puede actuar también como filtro de ondas propagantes.' En este caso, el RH atenua las ondas en un rango de frecuencia muy selectivo. En la mayoría de los textos de acústica, solamente se desarrolla la teoría que explica el filtrado de ondas propagantes. Sin embargo, en los laboratorios de física basica, donde se dispone solamente de tubos de Kundt de pequeña longitud, no es simple realizar un arreglo experimental que asegure la presencia de ondas propagantes puras en su interior. La falta de una teoría para ondas estacionarias y las dificultades experimentales que señalamos han producido algunas confusiones en trabajos que tratan sobre el tema. En este artículo se presenta un modelo teórico que describe satisfactoriamente el comportamiento del RH cuando funciona como filtro de ondas estacionarias y se marcan las diferencias con la situación en que opera como filtro de ondas propagantes.

  11. The Power of a Single Mother: The Influence of Black Women on Their Sons' Academic Performance

    Science.gov (United States)

    Robinson, Quintin L.; Werblow, Jacob

    2013-01-01

    This study examines the ways single Black mothers contribute to the educational success of their 11th-grade sons, despite the fact that their sons are enrolled in "failing schools." Data from five interviews and one focus group reveal common characteristics of how single-Black mothers help their sons beat the odds.

  12. Sexy sons: a dead end for cytoplasmic genes.

    Science.gov (United States)

    Zeh, Jeanne A

    2004-08-07

    Critics of sexual conflict theory argue that females may gain a net reproductive benefit from mating with manipulative males because the direct costs that they suffer may be offset by the production of sexy, i.e. manipulative, sons. However, this exclusive focus on nuclear gene effects represents an incomplete view of female fitness. Females differ fundamentally from males in transmitting not only nuclear genes but also a wide range of cytoplasmic genetic elements (CGEs) that can have profound effects, from male killing to influencing development of the nervous system and cognitive ability. Maternal transmission of CGEs has two major implications for sexual selection. First, the evolution of male fitness traits, such as sperm competitive ability, may be constrained because response to selection on mitochondrial genomes can occur only through the female line. Second, CGEs bear the direct costs of male manipulation but gain no indirect benefits when females produce sexy sons. This should result in perpetual antagonistic coevolution between nuclear genes involved in male manipulation and CGEs that promote female resistance to male sexually selected traits. Explicit consideration of the consequences of selection acting on CGEs is therefore necessary for a better understanding of the relationship between sexual selection and sexual conflict.

  13. Like daughter, like son? Fertility decline and the transformation of gender systems in the family

    Directory of Open Access Journals (Sweden)

    Keera Allendorf

    2012-10-01

    Full Text Available BACKGROUND An important question for population research is whether fertility decline transforms gender systems. OBJECTIVE This paper contributes to answering this broad question by examining how fertility decline may change the relative value and roles of daughters versus sons in families. First, I outline theoretical pathways, suggesting that a key factor is the gender composition of families. As fertility declines, the proportion of families with children of only one gender increases, which may facilitate greater gender symmetry between daughters and sons. Second, I explore how fertility decline may be transforming the relative value and roles of sons and daughters in practice in one place. METHODS The analysis draws primarily on semi-structured interviews with 30 respondents living in one Indian village. RESULTS In recent decades, fertility has declined to at least replacement levels. Respondents also perceive changes in the gender system, including less son preference, more equal schooling for sons and daughters, more freedom in marriage and pre-marital relationships, and perhaps greater daughter support of parents in old age. CONCLUSIONS The results describe changes in the relative value, treatment, and behavior of sons and daughters that are consistent with the theorized effects of fertility decline. Future research is needed, however, to determine whether fertility decline makes a unique causal contribution to changes in the gender system.

  14. The Putative Son's Attractiveness Alters the Perceived Attractiveness of the Putative Father.

    Science.gov (United States)

    Prokop, Pavol

    2015-08-01

    A body of literature has investigated female mate choice in the pre-mating context (pre-mating sexual selection). Humans, however, are long-living mammals forming pair-bonds which sequentially produce offspring. Post-mating evaluations of a partner's attractiveness may thus significantly influence the reproductive success of men and women. I tested herein the theory that the attractiveness of putative sons provides extra information about the genetic quality of fathers, thereby influencing fathers' attractiveness across three studies. As predicted, facially attractive boys were more frequently attributed to attractive putative fathers and vice versa (Study 1). Furthermore, priming with an attractive putative son increased the attractiveness of the putative father with the reverse being true for unattractive putative sons. When putative fathers were presented as stepfathers, the effect of the boy's attractiveness on the stepfather's attractiveness was lower and less consistent (Study 2). This suggests that the presence of an attractive boy has the strongest effect on the perceived attractiveness of putative fathers rather than on non-fathers. The generalized effect of priming with beautiful non-human objects also exists, but its effect is much weaker compared with the effects of putative biological sons (Study 3). Overall, this study highlighted the importance of post-mating sexual selection in humans and suggests that the heritable attractive traits of men are also evaluated by females after mating and/or may be used by females in mate poaching.

  15. ?Cuales son las amenazas o peligros volcanicos?

    Science.gov (United States)

    Myers, Bobbie; Brantley, Steven R.; Stauffer, Peter; Hendley, James W.

    2000-01-01

    Los volcanes son capaces de producir numerosos peligros geologicos e hidrologicos. Los cientificos del Servicio Geologico de los EE. UU. (USGS, por sus siglas en ingles) y de otras instituciones alrededor del mundo estan estudiando los peligros de muchos de los centenares de volcanes activos y potencialmente activos del mundo. Estos cientificos vigilan muy de cerca la actividad de algunos de los volcanes mas peligrosos, por lo que estan preparados para alertar a las autoridades y/o a la poblacion en caso de que aumente sustancialmente la probabilidad de que ocurra una erupcion u otro evento peligroso.

  16. "There is such a thing as too many daughters, but not too many sons": A qualitative study of son preference and fetal sex selection among Indian immigrants in the United States.

    Science.gov (United States)

    Puri, Sunita; Adams, Vincanne; Ivey, Susan; Nachtigall, Robert D

    2011-04-01

    In response to concerns from feminists, demographers, bioethicists, journalists, and health care professionals, the Indian government passed legislation in 1994 and 2003 prohibiting the use of sex selection technology and sex-selective abortion. In contrast, South Asian families immigrating to the United States find themselves in an environment where reproductive choice is protected by law and technologies enabling sex selection are readily available. Yet there has been little research exploring immigrant Indian women's narratives about the pressure they face to have sons, the process of deciding to utilize sex selection technologies, and the physical and emotional health implications of both son preference and sex selection. We undertook semi-structured, in-depth interviews with 65 immigrant Indian women in the United States who had pursued fetal sex selection on the East and West coasts of the United States between September 2004 and December 2009. Women spoke of son preference and sex selection as separate though intimately related phenomena, and the major themes that arose during interviews included the sociocultural roots of son preference; women's early socialization around the importance of sons; the different forms of pressure to have sons that women experienced from female in-laws and husbands; the spectrum of verbal and physical abuse that women faced when they did not have male children and/or when they found out they were carrying a female fetus; and the ambivalence with which women regarded their own experience of reproductive "choice." We found that 40% of the women interviewed had terminated prior pregnancies with female fetuses and that 89% of women carrying female fetuses in their current pregnancy pursued an abortion. These narratives highlight the interaction between medical technology and the perpetuation of this specific form of violence against women in an immigrant context where women are both the assumed beneficiaries of reproductive choice

  17. Nonthermal Radiation Processes in Interplanetary Plasmas

    Science.gov (United States)

    Chian, A. C. L.

    1990-11-01

    RESUMEN. En la interacci6n de haces de electrones energeticos con plasmas interplanetarios, se excitan ondas intensas de Langmuir debido a inestabilidad del haz de plasma. Las ondas Langmuir a su vez interaccio nan con fluctuaciones de densidad de baja frecuencia para producir radiaciones. Si la longitud de las ondas de Langmujr exceden las condicio nes del umbral, se puede efectuar la conversi5n de modo no lineal a on- das electromagneticas a traves de inestabilidades parametricas. As se puede excitar en un plasma inestabilidades parametricas electromagneticas impulsadas por ondas intensas de Langmuir: (1) inestabilidades de decaimiento/fusi5n electromagnetica impulsadas por una bomba de Lang- muir que viaja; (2) inestabilidades dobles electromagneticas de decai- miento/fusi5n impulsadas por dos bombas de Langrnuir directamente opues- tas; y (3) inestabilidades de dos corrientes oscilatorias electromagne- ticas impulsadas por dos bombas de Langmuir de corrientes contrarias. Se concluye que las inestabilidades parametricas electromagneticas in- ducidas por las ondas de Langmuir son las fuentes posibles de radiacio- nes no termicas en plasmas interplanetarios. ABSTRACT: Nonthermal radio emissions near the local electron plasma frequency have been detected in various regions of interplanetary plasmas: solar wind, upstream of planetary bow shock, and heliopause. Energetic electron beams accelerated by solar flares, planetary bow shocks, and the terminal shock of heliosphere provide the energy source for these radio emissions. Thus, it is expected that similar nonthermal radiation processes may be responsible for the generation of these radio emissions. As energetic electron beams interact with interplanetary plasmas, intense Langmuir waves are excited due to a beam-plasma instability. The Langmuir waves then interact with low-frequency density fluctuations to produce radiations near the local electron plasma frequency. If Langmuir waves are of sufficiently large

  18. Independent Contributions of Early Positive Parenting and Mother-Son Coercion on Emerging Social Development.

    Science.gov (United States)

    Akcinar, Berna; Shaw, Daniel S

    2018-06-01

    In the current study, we explored associations between parent-child coercion and positive parenting in the toddler period in relation to children's social-behavioral development during the school-age period. The data were drawn from the Pitt Mother & Child Project, a sample of 310 low-income, ethnically diverse boys. Drawing on tenets of both attachment and social learning theory, it was hypothesized that coercive mother-son interaction would lead to reductions in positive maternal parenting in the toddler period, and that both positive parenting and mother-son coercion in the toddler period would contribute to children's conduct problems at school entry and lower social skills and peer rejection in middle childhood. The results were largely confirmed, such that mother-son coercive interaction at 18 months was related to decreases in positive parenting at 24 months. Additionally, mother-son coercive interaction and positive parenting at 24 months were linked to child conduct problems at age 5, which in turn predicted child social skills and peer rejection during middle childhood. In addition to indirect effects through child conduct problems, mother-son coercion continued to be independently related to school-age peer rejection. The findings are discussed with respect to the importance of early coercive interactions in the growth of child social-behavioral development from early to middle childhood.

  19. Sons fricativos surdos Voiceless fricatives sounds

    Directory of Open Access Journals (Sweden)

    Carla Aparecida Cielo

    2008-01-01

    Full Text Available TEMA: características dos sons fricativos surdos. OBJETIVO: propor uma revisão da literatura pertinente às características acústicas, fonéticas e fonológicas dos fonemas fricativos surdos que integram o sistema fonológico do Português. Além disso, são descritas suas aplicações na terapia vocal. CONCLUSÕES: os fricativos são fonemas agudos, abrangendo de 2500 a 8000Hz; são plenamente adquiridos até os 3:7 anos de idade; o /s/ que também é o mais afetado em casos de frênulo lingual curto; a omissão do /s/ é uma das ocorrências mais freqüentes na alfabetização; sendo que, no desvio fonológico e na fissura lábio-palatina, freqüentemente ocorre comprometimento de toda a classe de fricativos. Na avaliação de voz, os fricativos são mencionados com as medidas de TMF e relação s/z, bem como seu uso como sons de apoio na fonoterapia.BACKGROUND: characteristics of voiceless fricative sounds PURPOSE: to review the literature related to acoustic, phonetics and phonological characteristics of voiceless fricative sounds that are part of the phonological system of the Portuguese Language. Furthermore, it describes the use of these sounds in voice therapy. CONCLUSIONS: fricatives are acute phonemes comprised between 2500 and 8000 Hz; they are fully acquired up to the age of 3:7 years; the /s/, which is the most affected in cases of short lingual frenum; omission of the /s/ is one of the most frequent occurrences during literacy education; and in the phonological deviation and labial-palatine fissure the entire class of fricatives is frequently affected. In voice assessment, fricative sounds are mentioned as TMF measurements and s/z relationship, and their use as support sounds in speech therapy.

  20. Major ion chemistry of the Son River, India: Weathering processes ...

    Indian Academy of Sciences (India)

    solute flux and CDR values. The water chemistry indicates that the Son River water is good to excellent .... to separate suspended sediments and preserved at. 4◦C for further ...... and waste water, 20th edn; American Public Health. Association ...

  1. South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula Ondas cuasi-estacionarias en el Pacífico sur y veranos fríos anómalos en el extremo norte de la Península Antártica

    Directory of Open Access Journals (Sweden)

    Alfredo J Costa

    2012-12-01

    presente trabajo tiene como objetivo analizar la circulación troposférica en el Hemisferio Sur (HS asociada a veranos (Dic-Feb anómalamente fríos (VAF en el período 1981-2010 sobre el extremo norte de la Península Antártica (PA mostrando que el verano de 2010 es singularmente frío, razón por la cual este verano es estudiado por separado. De ahí que el verano de 2010 es comparado con la composición de los VAFs previos a 2010. Se utiliza el criterio del cuartil para identificar VAFs y un flujo de actividad de onda para perturbaciones estacionarias cuasi-geostróficas (CG embebidas en un flujo básico que varía zonalmente como herramienta de diagnóstico para estudiar la propagación de trenes de ondas desde el Pacífico. Los VAFs previos a 2010 se caracterizan por un tren de ondas cuasi-estacionarias (OCE - del tipo patrón PSA (Pacífico-Sudamericano - extendido barotrópicamente en tropósfera hasta baja estratósfera, propagándose sobre el Pacífico Sur desde una región de convección anómala sobre Nueva Zelanda. Este tren de ondas da lugar a un centro ciclónico estacionario anómalo al noroeste de la PA. La componente anómala inducida de viento del Este junto a anomalías de alta nubosidad se encuentran asociadas a los VAFs sobre el norte de la PA. El singular verano de 2010 no sólo muestra un centro ciclónico estacionario anómalo al noroeste de la PA sino que también muestra uno anticiclónico en latitudes medias sobre el sudeste del Pacífico Sur. Desde ahí, hay propagación de OCE, localizada regionalmente, atravesando el sur de Sudamérica ya que no se observa una estructura de onda del tipo PSA sobre el Pacífico Sur. La propagación emana desde una zona de anomalías positivas de latemperatura de superficie del mar (TSM en el Pacífico Sur a través de la generación local de baroclinicidad del flujo medio. De ahí que esta propagación de OCE está asociada a actividad transiente anómala. A su vez, estas anomalías en la TSM podrían estar

  2. Paternal antisocial behavior and sons' cognitive ability: a population-based quasiexperimental study.

    Science.gov (United States)

    Latvala, Antti; Kuja-Halkola, Ralf; Långström, Niklas; Lichtenstein, Paul

    2015-01-01

    Parents' antisocial behavior is associated with developmental risks for their offspring, but its effects on their children's cognitive ability are unknown. We used linked Swedish register data for a large sample of adolescent men (N = 1,177,173) and their parents to estimate associations between fathers' criminal-conviction status and sons' cognitive ability assessed at compulsory military conscription. Mechanisms behind the association were tested in children-of-siblings models across three types of sibling fathers with increasing genetic relatedness (half-siblings, full siblings, and monozygotic twins) and in quantitative genetic models. Sons whose fathers had a criminal conviction had lower cognitive ability than sons whose fathers had no conviction (any crime: Cohen's d = -0.28; violent crime: Cohen's d = -0.49). As models adjusted for more genetic factors, the association was gradually reduced and eventually eliminated. Nuclear-family environmental factors did not contribute to the association. Our results suggest that the association between men's antisocial behavior and their children's cognitive ability is not causal but is due mostly to underlying genetic factors. © The Author(s) 2014.

  3. Major ion chemistry of the Son River, India: Weathering processes ...

    Indian Academy of Sciences (India)

    Major ion chemistry of the Son River, India: Weathering processes, dissolved fluxes and water quality assessment. Chinmaya Maharana, Sandeep Kumar Gautam,. Abhay Kumar Singh and Jayant K Tripathi. J. Earth Syst. Sci. 124(6) cO Indian Academy of Sciences. Supplementary data ...

  4. ...And Kronos Ate His Sons

    Science.gov (United States)

    Vitiello, Giuseppe

    In closed systems, energy is conserved. The origin of the time axis is completely arbitrary due to the invariance under continuous time-translations. The flowing of time swallows those fictitious origins one might assign on its axis, as Kronos ate his sons. Dissipation breaks such a scenario. It implies a non-forgettable origin of time. Open systems need their complement (their "double") in order to become, together, a closed system. Time emerges as an observable measured by the evolution of the open system complement, which acts as a clock. The conservation of the energy-momentum tensor in electrodynamics is considered and its relation with dissipative systems and self-similar fractal structures is discussed. The isomorphism with coherent states in quantum field theory (QFT) is established and the generator of transitions among unitarily inequivalent representations of the canonical commutation relations (CCR) is shown to provide sequences in time of phases, which defines the arrow of time. Merging properties of electrodynamics, fractal self-similarity, dissipation and coherent states point to an integrated vision of Nature.

  5. Les Ilenti ou maudire son prochain en turc

    Directory of Open Access Journals (Sweden)

    Altan Gokalp

    2009-05-01

    Full Text Available La langue turque contemporaine dispopse d’un nombre important de formules d’invective et de malédiction qui relèvent d’un genre appelé ilenç ou ilenti, forme qui est connue depuis les premières inscriptions turques runiques de la Haute Asie. Bien que l’islam réprouve le fait de maudire son prochain, le genre issu d’une grande tradition turque ancienne est d’un usage commun chez les Turcs. Plus encore, la manière de maudire relève d’une tradition savante, d’un « Grand Parler » qui s’apparente aux genres littéraires les plus classiques comme l’épopée, le conte ou la poésie lyrique : la métrique, les rimes, l’usage des assonances obéissent aux mêmes règles que la grande tradition littéraire turque. En cela, le fait d’user de l’invective et de la malédiction est d’une certaine manière une prétention à la distinction et à la domination de l’autre. Les cibles de l’invective éclairent bien cette volonté de dominer et de détruire son ennemi (le corps, la famille, la maladie, une mort peu digne, etc..

  6. 'SON-GO-KU' : a dream of automated library

    Science.gov (United States)

    Sato, Mamoru; Kishimoto, Juji

    In the process of automating libraries, the retrieval of books through the browsing of shelves is being overlooked. The telematic library is a document based DBMS which can deliver the content of books by simulating the browsing process. The retrieval actually simulates the process a person would use in selecting a book in a real library, where a visual presentation using a graphic display is substituted. The characteristics of prototype system "Son-Go-Ku" for such retrieval implemented in 1988 are mentioned.

  7. Variaciones metabólicas, enzimáticas y electrolíticas en pacientes urolitiásicos sometidos a litotripsia extracorpórea por ondas de choque | Metabolic, enzymatic and electrolytic variations in urolithic patients undergoing extracorporeal shock wave lithotripsy

    Directory of Open Access Journals (Sweden)

    William Velásquez,

    2017-10-01

    Full Text Available La urolitiasis es una patología renal potencialmente obstructiva que puede requerir de tratamientos no invasivos como la litotripsia extracorpórea por ondas de choque (LEOC para devolver la función renal normal al paciente. El objetivo del presente estudio descriptivo-longitudinal fue evaluar las variaciones glucídicas, lipídicas, proteicas, enzimáticas y electrolíticas en pacientes urolitiásicos, antes y después del tratamiento con LEOC. Se estudiaron 45 pacientes, con diagnóstico de urolitiasis, atendidos en el Instituto Metropolitano Docente de Urología, Caracas. Para tal fin, se tomaron muestras sanguíneas, 2 horas antes y 24 horas después del sometimiento a las ondas de choque. Posteriormente, se obtuvieron los sueros por centrifugación, y se determinaron las concentraciones de los parámetros glucosa (GLU, colesterol (COL, triglicéridos (TRIG, proteínas totales (PT, albúmina (ALB, sodio, potasio, cloruro, calcio, fósforo, magnesio, globulinas (GLOB, y las actividades de las enzimas lactato deshidrogenada (LDH, creatina fosfoquinasa (CFQ, fosfatasa alcalina (FA, alanina aminotrasferasa (AlAT y aspartato aminotransferasa (AsAT. Los resultados obtenidos ponen de manifiesto que, posterior al tratamiento con LEOC, se observaron incrementos significativos en la actividad de la enzima LDH y disminuciones significativas en los parámetros GLU, potasio, calcio, fósforo y magnesio. Estos resultados permiten señalar que, probablemente, los efectos de la LEOC sobre el páncreas, hígado y vías urinarias, ocasionan traumatismo, inflamación y afectan los niveles séricos de glucosa y electrolitos y la actividad de la enzima LDH.

  8. Empirical correlation among the dynamic elastic constants and the waves P and S velocities in rocks; Correlaciones empiricas entre las constantes elasticas dinamicas y las velocidades de las ondas P y S de las rocas

    Energy Technology Data Exchange (ETDEWEB)

    Contreras Lopez, Enrique [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1995-12-31

    Departing from the analysis of a data base on the velocities of the compression waves (V{sub p}) and the transverse waves (V{sub s}) in a group of 97 specimens of sedimentary, igneous and metamorphic rocks, the existence of four types of empirical correlation very well entailed between the dynamic elastic constants and the velocities V{sub p} and V{sub s}. These correlation allow the estimation with a very close approximation the elastic dynamic constants without the need of having available of the complete set of data (V{sub p}, V{sub s} and total density) that is normally required for its determination. The identified correlation is mathematically expressed by means of adjustment equations that reproduce in all of the cases the experimental values with a standard error of estimation within 10%, for the universe of rocks studied and with much less error for different specific lithological groups. The application methodologies of the correlation found for different cases of practical interest, are described. [Espanol] A partir del analisis de una base de datos experimentales sobre la velocidad de las ondas compresionales (V{sub p}) y de las ondas transversales (V{sub s}) de un conjunto de 97 especimenes de rocas sedimentarias, igneas y metamorficas, se identifica la existencia de cuatro tipos de correlaciones empiricas muy bien comportadas entre las constantes elasticas dinamicas y las velocidades V{sub p} y V{sub s}. Estas correlaciones permiten estimar con muy buena aproximacion las constantes elasticas dinamicas de las rocas sin tener que disponer del conjunto completo de datos (V{sub p}, V{sub s} y densidad total) que normalmente se requieren para su determinacion. Las correlaciones identificadas se expresan matematicamente mediante ecuaciones de ajuste que reproducen en todos los casos los valores experimentales con un error estandar de estimacion dentro de 10% para el universo de las rocas estudiadas, y con mucho menor error para diferentes grupos litologicos

  9. Síntese de MgAl2O4 por combustão assistida por micro-ondas: influência dos parâmetros de síntese na formação e na estrutura cristalina

    Directory of Open Access Journals (Sweden)

    R. L. B. A. Medeiros

    Full Text Available Resumo Nos últimos anos a técnica de combustão assistida por micro-ondas vem recebendo uma atenção especial, por ser uma técnica rápida, de baixo custo e de fácil manuseio, que permite obter materiais com boa homogeneidade química. O aluminato de magnésio (MgAl2O4 é um dos mais bem conhecidos materiais cerâmicos devido às suas excelentes propriedades, como alto ponto de fusão, elevada resistência mecânica em altas temperaturas, boa resistência ao choque térmico e resistência a ácidos e bases. O propósito deste trabalho é avaliar a influência da razão combustível/oxidante (Rco, temperatura de calcinação (Tcal e da potência do micro-ondas (Pmic na formação e na estrutura cristalina do MgAl2O4. Para realizar a reação de combustão foram utilizadas três potências (450, 675 e 900 W e três razões combustível/oxidante (0,8:1, 1:1 e 1,2:1. O material foi calcinado em três temperaturas (700, 800 e 900 ºC e foram realizadas análises de difração de raios X e microscopia eletrônica por varredura. Um planejamento fatorial 23 foi utilizado para avaliar a influência da Rco, Tcal e Pmic nos parâmetros como a cristalinidade e o tamanho de cristalito. Os resultados mostram que para os MgAl2O4 sintetizados com Rco maiores que 1:1 e Pmic menores que 675 W são obtidos tamanhos de cristalito entre 10 e 20 nm quando calcinados a 700 e 800 ºC. Com relação ao grau de cristalinidade, somente a Tcal exerce uma influência significativa.

  10. Empirical correlation among the dynamic elastic constants and the waves P and S velocities in rocks; Correlaciones empiricas entre las constantes elasticas dinamicas y las velocidades de las ondas P y S de las rocas

    Energy Technology Data Exchange (ETDEWEB)

    Contreras Lopez, Enrique [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1996-12-31

    Departing from the analysis of a data base on the velocities of the compression waves (V{sub p}) and the transverse waves (V{sub s}) in a group of 97 specimens of sedimentary, igneous and metamorphic rocks, the existence of four types of empirical correlation very well entailed between the dynamic elastic constants and the velocities V{sub p} and V{sub s}. These correlation allow the estimation with a very close approximation the elastic dynamic constants without the need of having available of the complete set of data (V{sub p}, V{sub s} and total density) that is normally required for its determination. The identified correlation is mathematically expressed by means of adjustment equations that reproduce in all of the cases the experimental values with a standard error of estimation within 10%, for the universe of rocks studied and with much less error for different specific lithological groups. The application methodologies of the correlation found for different cases of practical interest, are described. [Espanol] A partir del analisis de una base de datos experimentales sobre la velocidad de las ondas compresionales (V{sub p}) y de las ondas transversales (V{sub s}) de un conjunto de 97 especimenes de rocas sedimentarias, igneas y metamorficas, se identifica la existencia de cuatro tipos de correlaciones empiricas muy bien comportadas entre las constantes elasticas dinamicas y las velocidades V{sub p} y V{sub s}. Estas correlaciones permiten estimar con muy buena aproximacion las constantes elasticas dinamicas de las rocas sin tener que disponer del conjunto completo de datos (V{sub p}, V{sub s} y densidad total) que normalmente se requieren para su determinacion. Las correlaciones identificadas se expresan matematicamente mediante ecuaciones de ajuste que reproducen en todos los casos los valores experimentales con un error estandar de estimacion dentro de 10% para el universo de las rocas estudiadas, y con mucho menor error para diferentes grupos litologicos

  11. Modificaciones fotoinducidas de la respuesta no lineal en azopolímeros cristal líquido

    OpenAIRE

    Alicante, Raquel

    2011-01-01

    [INTRODUCCIÓN]: Las propiedades ópticas no lineales (ONL) son las propiedades ópticas de la materia bajo la acción de haces de luz muy intensos (láser). La manipulación de las ondas ópticas es una tecnología que tiene multitud de aplicaciones en fotónica (tecnología que comprende el almacenamiento, transmisión y procesado de información o imágenes) y optoelectrónica. Cuando se incide sobre un material no lineal con luz muy intensa, éste responde con una polarización que no es lineal respecto ...

  12. Identificación y caracterización de la población total de las células ganglionares de la retina en rata : nuevos métodos de trazado, expresión de melanopsina y de factores de transcripción Brn3:estudio de la respuesta neuronal y microglial a la axotomía y efecto del envejecimiento en la retina

    OpenAIRE

    Nadal Nicolás, Francisco Manuel

    2015-01-01

    Introducción La retina es parte del sistema nervioso central (SNC) y se localiza en la cara interna del globo ocular. Su función principal es la fototransducción de las ondas electromagnéticas del espectro de la luz visible en energía eléctrica. Esta función es realizada por los fotorreceptores (conos y bastones). Tras su procesamiento, la información llega a las células ganglionares de retina (CGR). Las CGR son las únicas neuronas aferentes de la retina y transmiten la información visual ...

  13. Tecnologías inalambricas. Soluciones wireless

    OpenAIRE

    Paredes Rodriguez, Damián

    2003-01-01

    Actualmente existen dos estándares técnicos (aunque tecnologías de transmisión por ondas hay muchas) para la conexión sin cables en el entorno personal y en el de empresa: BlueTooth y Wi-Fi. BlueTooth es un sistema muy versátil que podemos encontrarlo disponible en un gran número de dispositivos. Sus principales desventajas son su velocidad (1 Mbps, aproximadamente) y cobertura (un máximo de 40 metros), que lo hacen poco aconsejable en entornos informáticos de cierta exigencia. Wi-Fi (W...

  14. Comunicación con computador mediante señales cerebrales : aplicación a la tecnología de la rehabilitación

    OpenAIRE

    Martínez Pérez, Jose Luis

    2011-01-01

    Avances recientes en hardware para ordenadores personales y procesamiento de señal ha hecho posible el uso de señales EEG u ondas cerebrales para comunicación entre personas y computadores. Pacientes que sufren de síndromes bloqueantes disponen ahora de una nueva forma de comunicación con el resto del mundo, pero incluso con las más modernas técnicas, estos sistemas aún tienen tasas de comunicación del orden de 2-3 actividades / minuto. En suma, los dispositivos existentes no son diseñados co...

  15. Comunicación con computador mediante señales cerebrales : aplicación a la tecnología de la rehabilitación

    OpenAIRE

    Martínez Pérez, Jose Luis

    2010-01-01

    Avances recientes en hardware para ordenadores personales y procesamiento de señal ha hecho posible el uso de señales EEG u ondas cerebrales para comunicación entre personas y computadores. Pacientes que sufren de síndromes bloqueantes disponen ahora de una nueva forma de comunicación con el resto del mundo, pero incluso con las más modernas técnicas, estos sistemas aún tienen tasas de comunicación del orden de 2-3 actividades / minuto. En suma, los dispositivos existentes no son diseñados co...

  16. The relation of son preference and religion to induced abortion: the case of South Korea.

    Science.gov (United States)

    Chung, Woojin

    2007-09-01

    This paper explores the factors that influence the practice of induced abortion in a very low fertility society, with particular emphasis on son preference and three distinct religions: Confucianism, Buddhism and Christianity. Using multivariate logistic regression models fitted by the generalized estimating equation (GEE) method, this paper analysed the data collected by the 2000 Korea National Fertility and Family Health Survey of 6348 married women aged 15-49 years with a total of 1217 pregnancy outcomes. The results showed that the likelihood of induced abortions in women with two or more children, compared with those with one child, was significantly influenced by the sex composition of the previous children: odds ratio (OR)=12.71 (95% CI=5.49, 29.42) for women with only son(s), and OR=3.91 (95% CI=1.67, 9.14) for women with only daughter(s). At parity two, women with two sons were much more likely to have induced abortions than women with two daughters (OR=5.88, 95% CI=2.70, 12.85). Although Buddhist women were not significantly different from Confucian women in induced abortion practice, Christian women were much less likely than Confucian women to have an induced abortion (OR=0.39, 95% CI=0.18, 0.88 for women with only sons and OR=0.44, 95% CI=0.24, 0.81 for women with two children). This suggests that even in this very low fertility society, son preference and religious affiliation are significant predictors of women's practice of induced abortion.

  17. Older parents enjoy better filial piety and care from daughters than sons in China

    DEFF Research Database (Denmark)

    Zeng, Yi; George, Linda; Sereny, Melanie

    2016-01-01

    OBJECTIVE: To examine whether older parents in China would benefit more from daughters' care than from sons' emotional care. METHOD: Analysis of the unique data sets of the Chinese Longitudinal Healthy Longevity Survey conducted in 2002, 2005, and 2008-2009 in 22 provinces. RESULTS: As compared......' health outcome could help promote gender equality and reduce traditional son preference, especially in rural China....

  18. A case of aneurysmal bone cyst in father and son

    International Nuclear Information System (INIS)

    Leithner, A.; Windhager, R.; Kainberger, F.; Lang, S.

    1998-01-01

    The authors report a familial case of primary aneurysmal bone cyst in father and son, affecting both at the same location at nearly the same age. This fact again raises the speculation of a genetic link as another factor in the pathogenesis of aneurysmal bone cyst

  19. Mother-son discrepant reporting on parenting practices: The contribution of temperament and depression.

    Science.gov (United States)

    Shishido, Yuri; Latzman, Robert D

    2017-06-01

    Despite low to moderate convergent correlations, assessment of youth typically relies on multiple informants for information across a range of psychosocial domains including parenting practices. Although parent-youth informant discrepancies have been found to predict adverse youth outcomes, few studies have examined contributing factors to the explanation of informant disagreements on parenting practices. The current study represents the first investigation to concurrently examine the role of mother and son's self-reported affective dimensions of temperament and depression as pathways to informant discrepancies on parenting practices. Within a community sample of 174 mother-son dyads, results suggest that whereas mother's self-reported temperament evidenced no direct effects on discrepancies, the association between the product term of mother's negative and positive temperament and discrepancies on positive parenting was fully mediated by mother's depression (a mediated moderation). In contrast, son's self-reported temperament evidenced both direct and indirect effects, partially mediated by depression, on rating discrepancies for positive parenting. All told, both son's self-reported affective dimensions of temperament and depression contributed to the explanation of discrepant reporting on parenting practices; only mother's self-reported depression, but not temperament, uniquely contributed. Results highlight the importance of considering both parent and youth's report in the investigation of informant discrepancies on parenting practices. (PsycINFO Database Record (c) 2017 APA, all rights reserved).

  20. Having a son or daughter with Down syndrome: perspectives from mothers and fathers.

    Science.gov (United States)

    Skotko, Brian G; Levine, Susan P; Goldstein, Richard

    2011-10-01

    This study asks parents who have children with Down syndrome (DS) how they feel about their lives so that such information could be shared with expectant couples during prenatal counseling sessions. A valid and reliable survey instrument was mailed to 4,924 households on the mailing lists of six non-profit DS organizations. Of the 2,044 respondents, 99% reported that they love their son or daughter; 97% were proud of them; 79% felt their outlook on life was more positive because of them; 5% felt embarrassed by them; and 4% regretted having them. The parents report that 95% of their sons or daughters without DS have good relationships with their siblings with DS. The overwhelming majority of parents surveyed report that they are happy with their decision to have their child with DS and indicate that their sons and daughters are great sources of love and pride. Copyright © 2011 Wiley-Liss, Inc.

  1. Values that Fathers Communicate to Sons about Sex, Sexuality, Relationships, and Marriage.

    Science.gov (United States)

    Coakley, Tanya M; Randolph, Schenita D; Shears, Jeffrey; Collins, Patrick

    2017-01-01

    African American males between ages 13 and 24 are disproportionately affected by unintended pregnancy and sexually transmitted infections (STIs) such as chlamydia, gonorrhea, syphilis, and HIV/AIDS; indeed, they account for 50% of HIV infections among all youth. Clear communication between parents and their youth about sex is associated with higher rates of sexual abstinence, condom use, and intent to delay initiation of sexual intercourse, which can prevent STIs and unintended pregnancy. However, barriers exist for parents to educate their youth about sexual health. The purpose of this article is to explore the values fathers communicate to their sons to prevent their risky sexual behaviors that lead to STIs, HIV, and adolescent parenthood. This was a qualitative study conducted from May and June 2015. African American fathers (N = 29) who had sons, ages 10 to 15 years, participated in five focus groups across metropolitan and rural North Carolina communities in barbershops. A qualitative content analysis revealed four themes regarding areas that fathers imparted their values onto their sons to protect them from sexual health risks: (a) sex, (b) sexuality, (c) relationships, and (d) marriage. The findings have implications for social work and public health practice.

  2. Lo que son mujeres en los escenarios

    Directory of Open Access Journals (Sweden)

    González Cañal, Rafael

    2007-06-01

    Full Text Available In this article I review the publishing and stage trajectory of one of Rojas Zorrilla’s most significant plays: Lo que son mujeres. As well as collecting a list of the different editions, I emphasize the 1822 version by the Mexican Manuel Eduardo de Gorostiza, which started a new renaissance period for this play on stage. I also analyze the 1899 one-act version by Emilio Bobadilla. Finally, I include all the different productions between the 17th and the 19th centuries, and address the little interest aroused in the 20th century–suffice to say that it has not been staged even during these early years of the 21st century when the centenary of Rojas Zorrilla is being celebrated.En este artículo se hace un repaso detallado de la fortuna editorial y escénica de una de las obras más significativas de Rojas Zorrilla: Lo que son mujeres. Aparte de recoger las diferentes ediciones de la misma, se hace hincapié en la refundición del mexicano Manuel Eduardo de Gorostiza, estrenada en 1822, que abrió un período de cierta recuperación de este texto dramático en los escenarios. Se analiza también la refundición que llevó a cabo en un solo acto Emilio Bobadilla en 1899. Finalmente, se registran todas las representaciones conocidas de la obra desde el siglo XVII hasta el siglo XIX y se constata el poco interés que ha despertado en los escenarios del siglo XX. Incluso en los últimos años, en los que los montajes de obras de Rojas comienzan a ser más frecuentes, esta obra no ha sido todavía llevada a escena.

  3. O campo magnético e a massa dos mésons

    OpenAIRE

    Camila Sampaio Machado

    2013-01-01

    Neste trabalho buscamos explorar os efeitos do campo magnético, criado em colisões de íons pesados não-centrais, em estados ligados. Motivados pelo caso do átomo de hidrogênio, onde a presença do campo magnético deixa o estado mais ligado,estudamos o caso dos mésons B e D. Inicialmente trabalhamos com a equação de Schrödinger e utilizamos o modelo de potencial de Cornell que faz uma boa descrição da espectroscopoia de mésons pesados. Em seguida, utilizando as regras de soma da QCD, procuram...

  4. Litotricia por ondas de choque extracorpóreas como tratamiento de los cálculos del conducto pancreático principal Extracorporeal shock- wave lithotripsy as a treatment of the calculi of the main pancreatic duct

    Directory of Open Access Journals (Sweden)

    Domingo Pérez González

    2004-12-01

    Full Text Available Las ondas de choque extracorpóreas se utilizan desde hace varios años con buenos resultados en la fragmentación de cálculos vesiculares y de las vías biliares en pacientes seleccionados. Cuando los cálculos del conducto pancreático principal no pueden extraerse endoscópicamente está indicada esta variante no quirúrgica. Se presentan 4 pacientes del sexo masculino, entre 41 y 55 años de edad, con antecedentes de alcoholismo y el diagnóstico de pancreatitis crónica con litiasis en el conducto principal, 3 de ellos con más de 1 cálculo, que recibieron ondas de choque generadas por el principio electromagnético. Todos fragmentaron. El paciente con cálculo único eliminó los fragmentos espontáneamente, mientras que en los 3 restantes fue necesario asociar la endoscopia para obtener la limpieza total de Wirsung . Durante el seguimiento de más de 5 años se constató la regresión de los síntomas, fundamentalmente del dolor, sin recidivasThe extracorporeal shock waves have been used for several years with good results in the fragmentation of calculi of the gallbladder and of the biliary tract in selected patients. When the calculi of the main pancreatic duct cannot be endoscopically removed, this non-surgical variant is indicated. 4 male patients aged 41-55 with alcoholism history and the diagnosis of chronic pancreatitis with lithiasis in the main duct are presented. 3 of them with more than a calculus received shock waves generated by electromagnetic principle. All the calculi were fragmented. The patient with only one calculus eliminated the fragments spontaneously, whereas in the other 3 it was necessary to associate endoscopy to obtain Wirsung's total cleaning. During the follow-up of more than 5 years it was proved the regression of the symptoms, mainly pain, without relapses

  5. Is a {mu}mol a {mu}mol? Growth and development of chrysanthemum cultivated under SON-T lighting and under LED-lighting; Is a {mu}mol a {mu}mol? Groei en ontwikkeling van chrysant geteeld onder SON-T belichting en onder LED verlichting

    Energy Technology Data Exchange (ETDEWEB)

    Meinen, E.; Marcelis, L.F.M.; Steenhuizen, J.W.; Dueck, T.A.

    2009-12-15

    Description of an experiment that was conducted, comparing LED lamps and SON-T (high pressure sodium) lamps. In climate rooms with LED (96% red sodium lamps) or SON-T lamps (without daylight), chrysanthemums were cultivated at two light intensities. Although the air temperature was the same in both treatments, the leaf temperature was clearly higher in the case of SON-T as a result of heat radiation. In the case of LED a more round leaves were observed. Plants cultivated under SON-T light developed closed crops much quicker and required a shorter reaction time (10 to 14 days at high and low light intensity). Yet, the harvest weight of the branches was the same. The net leaf photosynthesis was lower in chrysanthemums cultivated under LED lighting compared to plants cultivated under SON-T lighting. This is probably due to long-term cultivation under a spectrum of almost exclusively red light. The differences between SON-T and LED with regard to light color and heat radiation have significant consequences for growth and development. [Dutch] Een experiment is uitgevoerd om LED lampen en SON-T (hogedruk natriumlampen) lampen te vergelijken. In klimaatkamers met LED (96% rood en 4% blauw) of SON-T lampen (zonder daglichttoetreding) werden chrysanten geteeld bij 2 lichtintensiteiten. Hoewel de luchttemperatuur identiek was bij beide behandelingen was de bladtemperatuur duidelijk hoger bij SON-T als gevolg van warmtestraling. Onder LED belichting werd meer 'bol blad' waargenomen. Planten geteeld onder SON-T belichting ontwikkelden sneller een gesloten gewas en hadden een kortere reactietijd (10 tot 14 dagen bij hoge en lage lichtintensiteit). Maar het oogstgewicht van de takken was gelijk. De netto actuele bladfotosynthese was lager bij chrysanten geteeld onder LED belichting vergeleken met planten geteeld onder SON-T belichting. Dit is waarschijnlijk toe te schrijven aan langdurige teelt onder een spectrum met vrijwel alleen rood licht. De verschillen tussen SON

  6. Son huasteco e identidad regional

    Directory of Open Access Journals (Sweden)

    Rosa María Bonilla Burgos

    2013-04-01

    Full Text Available La población de la región Huasteca es partícipe de manifestaciones musicales en diferentes ámbitos, lo cual permite reconocer que entre todos los géneros utilizados destaca el son huasteco y su correspondiente bailable llamado huapango. Dichas expresiones musicales se impregnan de los ambientes tanto físico como social que viven constantemente. Es a través de las letras de los sones huastecos que se desarrolla el mecanismo para reflejar el mundo natural que perciben, y los acontecimientos que les suceden, cobrando una importancia que deriva en una identificación que trasciende. Conciben su entorno y lo refieren con sentido de pertenencia-apropiación, que les permite recrear su vida y fundirse en una identificación cultural a la que se le llamará “identidad regional”. La relevancia de considerar una expresión musical de estas características radica en que se preserva y enriquece constantemente unificando un área de México que no necesariamente corresponde a límites políticos establecidos en las diferentes etapas históricas.

  7. Por qué todas las cuentas son falsas

    OpenAIRE

    Aerde, Michel van

    1994-01-01

    Los principales criterios para evaluación y decisión, en la sociedad actual, son inspirados por cálculos económicos. Mucho nos preocupamos de cuentas pero muy poco nos preguntamos de lo que es el dinero. Muy poco reflexionamos filosóficamente, ontológicamente, sobre la naturaleza misma del dinero. ¿Qué es esto que pretende ser la base de nuestra sociedad? El dinero es mentiroso por naturaleza. Es una representación de mucha vida, que no puede ser representada. El dinero es peligroso, se convi...

  8. Understanding Motherhood as Maturation: Maternity Scripts in Lois Lowry's "Son"

    Science.gov (United States)

    Deszcz-Tryhubczak, Justyna; Marecki, Mateusz

    2015-01-01

    When put together with the other parts of The Giver Quartet, "Son" (2012), Lowry's recently published concluding book, emerges as an odd exception to the focus on young adult protagonists since it foregrounds the mother's perspective and addresses the issue of motherhood. It presents the reader with at least three conceptual models of…

  9. Experiences of parents whose sons or daughters have (had) attempted suicide

    DEFF Research Database (Denmark)

    Buus, Niels; Caspersen, Jimmy; Hansen, Rasmus

    2014-01-01

    problem and relatives are understood as playing an important role in suicide prevention; however, suicide and suicidal behaviour affect the relatives' lives profoundly, both emotionally and socially, and the psychosocial impact on families is underresearched. DESIGN: Focus groups with parents of sons......AIM: The aim of this exploratory study was to gain further insights into the experiences of parents of sons or daughters who have attempted suicide and how these parents respond to the increased psychosocial burden following the suicide attempt(s). BACKGROUND: Suicide is a major public health...... or daughters who have attempted suicide. METHODS: In January and February 2012, we interviewed two groups of parents recruited at a counselling programme for relatives of persons who have attempted suicide. The analysis combined a thematic analysis with a subsequent analysis of how the themes were negotiated...

  10. Self-Organizing Networks (SON) Self-Planning, Self-Optimization and Self-Healing for GSM, UMTS and LTE

    CERN Document Server

    Ramiro, Juan

    2011-01-01

    With the current explosion in network traffic, and mounting pressure on operators' business case, Self-Organizing Networks (SON) play a crucial role. They are conceived to minimize human intervention in engineering processes and at the same time improve system performance to maximize Return-on-Investment (ROI) and secure customer loyalty. Written by leading experts in the planning and optimization of Multi-Technology and Multi-Vendor wireless networks, this book describes the architecture of Multi-Technology SON for GSM, UMTS and LTE, along with the enabling technologies for SON planning, opti

  11. ¿Música o magia? La presentación de las ondas musicales de Maurice Martenot en España

    Directory of Open Access Journals (Sweden)

    Gil Noé, José Vicente

    2015-12-01

    Full Text Available On 1928, the French musician Maurice Martenot presented at Paris Opera a new electronic musical instrument which he called musical waves. It had success like only a few and attracted the interest of the composers, Martenot strove to spread it with a initial tour that took it all around the world between 1931 and 1932. From the information given by the press –because there are not more references– this article aims to rebuild the presentation of the instrument in Spain all along 1932, to report about the reception by the review and to justify the mystery that involved the instrument because of its unknown electronic running and its performance only with the hands movement on the air.En 1928, el músico francés Maurice Martenot presentó un nuevo instrumento musical electrónico en la Ópera de París al que llamó ondas musicales. Siendo uno de los pocos que gozó de éxito y que atrajo para sí la atención de los compositores, Martenot puso todo el empeño en su difusión ya desde una gira inicial que le llevó por todo el mundo entre 1931 y 1932. A partir de la información brindada por la prensa –pues no existen más referencias– este artículo pretende reconstruir la presentación del instrumento en España a lo largo de 1932, dar cuenta de la recepción por parte de la crítica y justificar cierto halo de misterio que lo envolvió tanto por su desconocido funcionamiento electrónico como por su forma de interpretarse solo con el movimiento de las manos en el espacio.

  12. Léon Bardalès: Sa vie et son œuvre

    Directory of Open Access Journals (Sweden)

    Ilias Taxidis

    2011-07-01

    Full Text Available Cette étude comprend la présentation et l’édition critique de deux lettres et six poèmes de Léon Bardalès qui fut l’un des dignitaires impériaux byzantins de la fin du XIIIe et du début du XIVe siècle. Pour l’occasion, toutes les données concernant l’auteur et son activité politique et littéraire sont réévaluées conformément aux informations fournies par les lettres que Bardalès a reçues d’épistoliers connus de son époque, comme Maxime Planude, Nicéphore Choumnos et Nicéphore Grégoras. Dans l’édition, les erreurs et fautes d’inattention des éditeurs précédents sont corrigées, et un apparat des sources est ajouté.

  13. Caracterización mediante HRTEM de un acero AISI4140 nitrurado por postdescarga micro-ondas

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    Béjar-Gómez, L.

    2005-12-01

    Full Text Available An analysis of the nitrides formed in an AISI 4140 steel nitrided by postdischarge microwave nitriding treatment was carried out by high resolution transmission electron microscopy (HRTEM, fast Fourier transform (FFT and nanoanalysis. The steel samples were nitrided below of the eutectoid transformation point (590 °C, after nitriding the samples were cooling slowly inside in the reactor whit an argon atmosphere. The analysis were carried out in a FEG-TEM PHILIPS TECNAI F20 at 200 Kv. The results showed the morphology and size of the nitrides ε-Fe2-3N and γ’-Fe4N, which had coherency whit the matrix. By other hand the following crystallographic relations were determined: (110 Fe-α ║ (1001 ε-Fe2-3N ║ (110 γ’-Fe4N and [1-1 0]Fe-α ║ [1 0-1 0] ε-Fe2-3N ║ [0 1 1] Fe4N.

    Un análisis de las fases de nitruros formados en un acero AISI 4140, nitrurado mediante condiciones de postdescarga micro-ondas, se llevó a cabo por microscopía electrónica de transmisión de alta resolución (HRTEM, rápida transformada de Fourier (FFT y nanoanálisis. Las muestras de acero fueron nitruradas por debajo del punto de transformación eutectoide (590 °C; después del tratamiento de nitruración las piezas fueron enfriadas lentamente dentro del reactor con una atmósfera de argón. Los análisis se realizaron en un microscopio Philips con cañón de emisión de campo Tecnai F20 a 200 Kv (PHILIPS FEG-TEM TECNAI F20. Los resultados mostraron la morfología y tamaño de los nitruros de hierro ε-Fe2-3N y γ’-Fe4N, los cuáles mostraron coherencia con la matriz. Además, se obtuvo la siguiente relación de coherencia entre precipitados y matriz: (110 Fe-α ║ (1001 ε-Fe2-3N ║ (110 γ’-Fe4N y [1-1 0]Fe-α ║ [1 0-1 0] ε-Fe2-3N ║ [0 1 1] Fe4N.

  14. Que son las Cochinillas de los Cotrus (Naranjos, Limoneros, Mandarinos, etc. y como se Combaten.

    Directory of Open Access Journals (Sweden)

    Posada Sinisterra. Belisario

    1942-04-01

    Full Text Available Las cochinillas son insectos de aspecto variado. Son llamados también insectos-escamas porque la mayoría de ellos viven protegidos por una concha o escama de forma y coloración diversa. Las especies que en seguida se describen tienen un ciclo biológico muy similar. Se reproducen por medio de huevos que depositan las hembras bajo la escama.

  15. Physicochemical and sensory profile of rice bran roasted in microwave Perfil físico-químico e sensorial de farelos de arroz torrados em micro-ondas

    Directory of Open Access Journals (Sweden)

    Marina Costa Garcia

    2012-12-01

    Full Text Available The purpose of this study was to evaluate the physical, chemical, and sensory changes in bran from three rice cultivars according to microwave roasting time. This study analyzed three rice cultivars, BRS Sertaneja (S, BRS Primavera (P, and IRGA 417 (I determining the color parameters (L*, a*, and b * at 6, 9, 12, 15, and 18 minutes of roasting time. After applying the difference from control test, the rice brans with different characteristics aroma and flavor were selected: S and P roasted for 9 and 15 minutes and IRGA 417 roasted for 9, 12, and 15 minutes. These samples were characterized by Free-Choice Profile descriptive sensory analysis, and their chemical composition was also determined. The longer the roasting process, the higher the roasted flavor intensity and aroma. The IRG 417 cultivar roasted for 12 minutes showed a sweeter flavor and aroma. After roasting, the brans remained rich in protein and lipid and presented higher fiber content and lower reducing sugar and phytic acid content. Microwave roasting for 12 minutes can be a viable option for improving the sensory functional and nutritional characteristics of the rice bran considering its use in food products.Este trabalho objetivou avaliar as mudanças físicas, químicas e sensoriais de farelos de três cultivares de arroz em função do tempo de torra em micro-ondas. Foram estudados 3 cultivares de arroz, BRS Sertaneja (S, BRS Primavera (P e Irga 417 (I, determinando-se os parâmetros de cor (L*, a* e b* aos 6, 9, 12, 15 e 18 minutos de torração. Após aplicação do teste de diferença do controle, selecionaram-se farelos de arroz com características de sabor e aroma distintas: S e P torrados por 9 e 15 minutos e I torrado por 9, 12 e 15 minutos. Essas amostras foram caracterizadas pela análise sensorial descritiva de Perfil Livre e quanto composição química. Quanto mais longa a torração, mais intenso o aroma e sabor de torrado dos farelos, apresentando sabor e aroma

  16. Seguindo a onda: o gratuito em primeiro

    Directory of Open Access Journals (Sweden)

    Francisco das Chagas de Souza

    2007-12-01

    , inclusive com a implantação das reengenharias que destruíram muitos empregos no mundo todo; e b o desenvolvimento de muitas novas tecnologias de comunicação e informação a partir dos anos 1980, dando condições de seu barateamento e maior possibilidade de ser acessível às classes médias e, com chances de, num horizonte não muito restrito, atingir parte das classes trabalhadoras. É esta coincidência entre o capital que quer mais lucrar e a tecnologia que precisa ser cada vez mais consumida, que estabelece então o quadro favorável a uma distribuição mais larga da informação e, por conseguinte, uma noção de que a informação vale muito mais e retro-alimenta muito mais o próprio mundo do capital, quanto mais ela circula. E quanto mais ela circula tanto mais necessita de outros serviços como eletricidade, transporte de equipamentos de acesso à informação, desenvolvimento de pacotes de informação cada vez mais sofisticados, serviços de manutenção, novas estratégias de engenharia em muitos âmbitos etc. Enfim, quanto mais informação e comunicação gratuita, tanto mais os negócios das mídias e das telecomunicações avançam. Então a nossa consciência, o nosso entusiasmo em fazer a criação das condições para difundir conteúdos em arquivos abertos, em desenvolver bibliotecas digitais, ao tempo em que nos alegra, não nos pode cegar e nos impedir de perceber que somos ampliadores do movimento do capital. E isso é dito como uma constatação de quem está seguindo uma onda, que hoje é dominante. Este movimento mundial em torno dos arquivos abertos, que envolve muitas das melhores mentes e capacidades de produzir conhecimento aplicado à comunicação científica, não poderia deixar de motivar os que fazem esta revista a estimular dois pesquisadores brasileiros, Lígia Café e Hélio Kuramoto, a organizar esta edição especial. Por isso, quero agradecer, em nome da Comissão Editorial de Encontros Bibli, a ambos, pelo aceite em

  17. Like father, like son: the intergenerational cycle of adolescent fatherhood.

    Science.gov (United States)

    Sipsma, Heather; Biello, Katie Brooks; Cole-Lewis, Heather; Kershaw, Trace

    2010-03-01

    Strong evidence exists to support an intergenerational cycle of adolescent fatherhood, yet such a cycle has not been studied. We examined whether paternal adolescent fatherhood (i.e., father of study participant was age 19 years or younger when his first child was born) and other factors derived from the ecological systems theory predicted participant adolescent fatherhood. Data included 1496 young males who were interviewed annually from the National Longitudinal Survey of Youth 1997. Cox regression survival analysis was used to determine the effect of paternal adolescent fatherhood on participant adolescent fatherhood. Sons of adolescent fathers were 1.8 times more likely to become adolescent fathers than were sons of older fathers, after other risk factors were accounted for. Additionally, factors from each ecological domain-individual (delinquency), family (maternal education), peer (early adolescent dating), and environment (race/ethnicity, physical risk environment)-were independent predictors of adolescent fatherhood. These findings support the need for pregnancy prevention interventions specifically designed for young males who may be at high risk for continuing this cycle. Interventions that address multiple levels of risk will likely be most successful at reducing pregnancies among partners of young men.

  18. THE EPITHESIS IN THE LOAN WORDS ALINTI KELİMELERDE SON TÜREME

    Directory of Open Access Journals (Sweden)

    Gülden SAĞOL YÜKSEKKAYA

    2010-01-01

    Full Text Available Anaptyxis is a sound appearing that is not found in the original structure of the word. There are three types of anaptyxis: prothesis, epenthesis and epithesis. Epithesis is a vowel or consonant appearing at the end of a word which is not found in the original structure of it. Although, there isn’t not so much example, both vowel and consonant reproduction is seen even in the last sound of the word; but the derivative sound isn’t the same, standard in the whole dialects and accents. Nevertheless some derivative sounds have an intense in a specific region, they aren’t seen in the other areas or has rare example. In this study, the epithesis in the loan words in Turkish will be emphasized. Bir kelimede aslında bulunmayan bir sesin sonradan ortaya çıkmasına ses türemesi denir. Ses türemesinin üç çeşidi vardır: ön türeme, iç türeme, son türeme. Son türeme, kelimenin aslında bulunmayan bir ünlü veya ünsüzün kelime sonunda belirmesidir. Örneği fazla olmamakla birlikte son seste de hem ünlü hem de ünsüz türemesi görülür. Ancak türeyen sesler standart olarak bütün lehçe ve ağızlarda ortak değildir. Türeyen bazı sesler belli bir bölge içerisinde yoğunlaşırken, bazı bölgelerde görülmemekte veya sadece birkaç, hatta bir örnekle sınırlı kalabilmektedir. Bu çalışmada Türkçede alıntı kelimelerdeki son türeme örnekleri üzerinde durulacaktır.

  19. ‘To refer, not to characterise’: A synchronic look at the Son-of-Man logia in the Sayings Gospel Q

    Directory of Open Access Journals (Sweden)

    Llewellyn

    2013-03-01

    Full Text Available The article intends to address the Son-of-Man problem by applying Delbert Burkett’s ‘question of reference’ to those Son-of-Man logia that appear in the Sayings Gospel Q. A position is taken that recent philological approaches to the Son-of-Man problem have not been overly convincing, successful or helpful. Similarly, attempting to determine the authenticity of individual Son-of-Man sayings has not led to any form of scholarly consensus. In place of these approaches, a synchronic approach is defended and applied to the Son-of-Man sayings in Q, with interesting results.

  20. Introducción a la relatividad numérica

    Directory of Open Access Journals (Sweden)

    F. S. Guzmán

    2007-01-01

    Full Text Available En este manuscrito se presentan ejemplos de aplicación de la aproximación en diferencias finitas a la solución de sistema s de ecuaciones diferenciales parciales, en particular sistemas de ecuaci ones asociados a las ecuaciones de Einstein. El objetivo es que los ejemplos most rados sirvan como introducción a la Relatividad Numérica. Los casos que s e estudian con profundidad son: la ecuación de onda en un espacio-tiemp o 1+1 plano en general, el campo escalar real acoplado a la Relatividad General y el campo escalar complejo acoplado a la Relatividad General.

  1. PRINCIPIOS BÁSICOS DE ULTRASONOGRAFÍA VETERINARIA

    Directory of Open Access Journals (Sweden)

    Carlos Giraldo E.

    2003-12-01

    Full Text Available La tecnología del ultrasonido nace en 1880 con eldesarrollo de los efectos piezoeléctricos. Luego fueaplicada en forma de SONAR (Sound Navigation andRanging durante la segunda guerra mundial para ladetección de barcos, submarinos y aviones de guerra.La emisión de las ondas de ultrasonido se obtiene pormedio de cristales que son sometidos a una corrienteeléctrica logrando que vibren, la recepción de éstasondas se logra cuando retornan de nuevo a los cristalesal chocar con los tejidos. Estos cristales están contenidosen dispositivos llamados transductores o sondasecográficas conectadas a un monitor

  2. Uso de la frecuencia del pulso en la estimación de la carga de trabajo Evaluación de una actividad de movilización de cargas

    OpenAIRE

    Castillo-Martínez, Juan A; Cubillos, Angela

    2014-01-01

    Introducción: la frecuencia del pulso es un indicador directo del estado del sistema cardiovascular, además de ser un indicador indirecto de la energía gastada en la ejecución de una tarea. El pulso de una persona es el número de pulsaciones registradas en una arteria periférica por unidad de tiempo, que se manifiesta como una onda de presión que se mueve a lo largo de los vasos sanguíneos, los cuales son flexibles. “En las grandes ramas arteriales, su velocidad es de 7 a 10 m/s y en las arte...

  3. Simulación del flujo de gas en ductos de escape de motores de combustión interna: Primera parte: aspectos teóricos

    OpenAIRE

    Mantilla, Juan Miguel; Falla, Camilo Andrés; Gómez, Jorge Arturo

    2009-01-01

    La simulación del sistema de escape de un motor de combustión de cuatro tiempos encendido por chispa se puede realizar a partir de la teoría de flujo inestable de gases utilizando ondas de presión. El método aquí explicado se basa en la discretización de espacios interpolables denominados mallas, que se ubican a lo largo de toda la tubería sin importar la forma o el tamaño de ésta. Se hace entonces una exploración teórica por los aspectos más importantes, como son el movimiento y choque de la...

  4. Integrating Equality - Globalization, Women's Rights, Son Preference and Human Trafficking

    OpenAIRE

    Cho, Seo-Young

    2011-01-01

    Employing economic and social globalization indicators, we empirically analyze whether globalization affects women’s rights in the economic and social dimensions. Using panel data from 150 countries over the 1981-2008 period, we find that social globalization positively affects both women’s economic and social rights, while the impact of economic globalization disappears when controlling for social globalization. Furthermore, we find that social globalization also reduces ‘son preference’ pro...

  5. Fathers Are Important People: A Study of Father-Son Sexual Communication

    Science.gov (United States)

    DiIorio, Colleen; Lehr, Sally; Wasserman, Jill L.; Eichler, Michelle; Cherry, Chauncey; Denzmore, Pamela

    2006-01-01

    The purpose of this study was to examine the perceived role of African-American fathers in educating their sons about sex and HIV prevention. Given that some studies have shown a relationship between parent-adolescent sexual communication and adolescent sexual behavior, and the disproportionately high rates of teen pregnancy and HIV (and other…

  6. The role of God in the father/son relationship during identity formation – a Gestalt theoretical perspective

    Directory of Open Access Journals (Sweden)

    H.B. Grobler

    2010-07-01

    Full Text Available This article is based on research done within the Afrikaansspeaking community in the area of the Drakenstein Municipality, Western Cape province, South Africa. The focus falls specifically on one concept that was outlined during the research, namely the perceptions of fathers and adolescent sons on identity formation within their relationship as well as the role that God plays. Combined qualitative/quantitative research was conducted with emphasis on semi-structured interviews with fathers (n=4 and adolescent boys (n=4 and an auto-ethnography of the author as the dominant component. The lessdominant quantitative component consisted of questionnaires completed by fathers (n=42 and adolescent boys (n=180. Metatheoretical assumptions and theoretical assumptions as grounding for the male identity are discussed as part of the author’s paradigmatic perspective. Furthermore, empirical findings are discussed and recommendations are made. From the discussions with fathers and their sons it was clear that both fathers and sons have a need to stand in close relationship to each other and to God. It is within this relationship where their identities are formed. However, fathers seemed to be resistant of transferring their beliefs to their sons. Adolescent boys also indicated no need to one day transfer learned behaviour from their fathers to their sons.

  7. Dynamic wired-wireless architecture for WDM stacking access networks

    Directory of Open Access Journals (Sweden)

    Gustavo Adolfo Puerto-Leguizamón

    2014-01-01

    Full Text Available Este artículo presenta una arquitectura dinámica para redes de acceso convergentes fijas e inalámbricas en red óptica pasiva ( PON basada en multiplexación en división de tiempo (TDM bajo el pa radigma de apilamiento de longitudes de onda. Cuatro longitudes de onda para servicios fijos transportando una carga de tráfico de 10 Gb/s, una longitud de onda reconfigurable extra y una longi tud de onda común a todas las unidades de red óptica (ONU para el transpor te de servicios inalámbricos se enviaron a una PON con un relac ión de división de 1:64. En la ONU un filtro sintonizable basado en óp tica de Fourier de espacio libre selecciona una de las longitud es de onda que transporta servicios fijos y un filtro basado en redes de d ifracción de Bragg (FBG extrae la longitud de onda que transpo rta servicios inalámbricos. En el enlace de subida se utilizó multiplexación por división de subportadora (SCM para el transporte combinado de señales en banda base e inalámbricas a la oficina central (CO.

  8. Sedação com propofol e alfentanil para litotripsia extracorpórea por ondas de choque

    Directory of Open Access Journals (Sweden)

    José Roberto Nociti

    2002-02-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Este estudo não-comparativo tem por objetivo pesquisar as doses adequadas de propofol e alfentanil em sedação para litotripsia extracorpórea por ondas de choque (LEOC bem como o tempo necessário para a alta hospitalar. MÉTODO: Foram observados 24 pacientes consecutivos de ambos os sexos submetidos a LEOC em regime ambulatorial, com estado físico ASA I ou II, sob sedação por via venosa com propofol na dose inicial de 1 mg.kg-1, seguida de infusão contínua com velocidade variável, e alfentanil na dose inicial de 15 µg.kg-1, seguida de bolus adicionais de 5 µg.kg-1 conforme as necessidades clínicas. Monitorização de SpO2, PAS, PAD e FC por método não-invasivo e alta hospitalar conforme critérios propostos por Kortilla para pacientes ambulatoriais. RESULTADOS: A duração média dos procedimentos foi de 46,8 ± 12,8 minutos. As doses totais médias de propofol e de alfentanil foram respectivamente de 59,0 ± 17,9 µg.kg-1.min-1 e 0,38 ± 0,14 µg.kg-1.min-1. Alta hospitalar em até 60 minutos em 58,3% dos casos; de 61 a 90 minutos em 20,9%; de 91 a 120 minutos em 12,5%; e acima de 120 minutos em 8,3%. Ocorreu dessaturação do sangue arterial (SpO2 £ 85% em pelo menos uma ocasião em 45,8% dos pacientes, com rápida recuperação após fornecimento de oxigênio a 100%. CONCLUSÕES: A sedação com propofol e alfentanil nas doses relatadas para LEOC constitui método prático, efetivo e seguro desde que adotadas medidas para monitorização e atendimento a complicações cardiorrespiratórias que podem ocorrer no curso do procedimento.

  9. ¡Son notables… los desaciertos y los vacíos!

    Directory of Open Access Journals (Sweden)

    Manuel Argüello Rodríguez

    2007-10-01

    Full Text Available Son notables las ausencias y los equilibrios forzados en el informe de los cinco ciudadanos costarricenses sobre el TLC. Ausencias y seudoequilibrios que han sido ya utilizados para fortalecer la campaña de propaganda arrebatadora contra la oposición al TLC indicando que ‘los notables’ desnudaron los fantasmas (con lo cual, a decir verdad no se vería nada, sería la total transparencia.

  10. Autosomal-dominant Leber Congenital Amaurosis Caused by a Heterozygous CRX Mutation in a Father and Son.

    Science.gov (United States)

    Arcot Sadagopan, Karthikeyan; Battista, Robert; Keep, Rosanne B; Capasso, Jenina E; Levin, Alex V

    2015-06-01

    Leber congenital amaurosis (LCA) is most often an autosomal recessive disorder. We report a father and son with autosomal dominant LCA due to a mutation in the CRX gene. DNA screening using an allele specific assay of 90 of the most common LCA-causing variations in the coding sequences of AIPL1, CEP290, CRB1, CRX, GUCY2D, RDH12 and RPE65 was performed on the father. Automated DNA sequencing of his son examining exon 3 of the CRX gene was subsequently performed. Both father and son have a heterozygous single base pair deletion of an adenine at codon 153 in the coding sequence of the CRX gene resulting in a frameshift mutation. Mutations involving the CRX gene may demonstrate an autosomal dominant inheritance pattern for LCA.

  11. Simulaciones hidrodinámicas de flujos complejos

    Science.gov (United States)

    María Ibáñez Cabanell, José

    Son muchos los escenarios astrofísicos en que los procesos hidrodinámicos juegan un papel clave. En la complejidad que encierra la descripción de dichos procesos destaca el de la correcta simulación de flujos complejos donde la presencia de ondas de choque fuertes que, eventualmente, interaccionan entre ellas o también la presencia de inestabilidades (Kelvin-Helmholtz, Rayleigh-Taylor, etc.) suponen un verdadero desafío numérico. Los códigos hidrodinámicos basados en la solución de un problema de valores iniciales discontinuo (problema de Riemann) son, en la actualidad, los más robustos en el campo de la dinámica de fluidos computacional. En esta charla se dará un resumen de los fundamentos de dichas técnicas numéricas (esquemas de alta resolución de captura de choques) y se ilustrará su potencialidad mostrando una amplia gama de resultados en diferentes aplicaciones astrofísicas.

  12. Selecting sex: the effect of preferring sons.

    Science.gov (United States)

    Hesketh, Therese

    2011-11-01

    Son preference remains common in countries from East Asia through South Asia to the Middle East and North Africa. Where sex selective technology and abortion are readily available, such as in China, South Korea and India, this has led to a marked excess in male births. Worst excesses are seen in parts of rural China where there are 140 male births for every 100 female. This leads to large numbers of unmarriageable men. Concerns about the consequences centre around the propensity to aggression and violence of these men with increased levels of crime and antisocial behaviour, threatening societal stability and security. But recent studies do not support these assumptions, but rather suggest that these men are marginalised, lonely, withdrawn and prone to psychological problems. Measures to reduce sex selection should include enforcement of existing legislation on sex-selection, and public awareness campaigns about the dangers of late abortion and gender imbalance. Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.

  13. Why Are Indian Children So Short? The Role of Birth Order and Son Preference.

    Science.gov (United States)

    Jayachandran, Seema; Pandi, Rohini

    2017-09-01

    Child stunting in India exceeds that in poorer regions like sub-Saharan Africa. Data on over 168,000 children show that, relative to Africa, India's height disadvantage increases sharply with birth order. We posit that India’s steep birth order gradient is due to favoritism toward eldest sons, which affects parents' fertility decisions and resource allocation across children. We show that, within India, the gradient is steeper for high-son-preference regions and religions. The gradient also varies with sibling gender as predicted. A back-of-the-envelope calculation suggests that India's steeper birth order gradient can explain over one-half of the India-Africa gap in average child height.

  14. BAKUNIN'S SON, A DIALOGIC NOVEL BY SERGIO ATZENI

    Directory of Open Access Journals (Sweden)

    Masina Depperu (Universidade de Lisboa

    2013-10-01

    Full Text Available Bakunin’s Son, a short novel by Sergio Atzeni, is the perfect embodiment of Bakhtin’s theory of the dialogic novel. The author sets his stories and characters - mostly humble outcast defeated people - in his own homeland, Sardinia. The accurately planned structure as an interview to thirty-two people reflects a multifarious reality with its complex rules and mentality expressed through different points of view, languages and ideologies. The protagonist’s story may result contradictory according to the different opinions of people who met him. Also the choice of a hybrid language contributes to create a highly connoted cultural context. In Bakunin’s Son, in fact, the Italian and the Sardinian overlap in a manner that cannot be distinguished or graphically marked, since form and meaning are fused together.Key words: dialogic novel, hybrid language.O filho de Bakunin, um romance polifónico de Sergio AtzeniO romance breve de Sergio Atzeni, O filho de Bakunin, è a perfeita exemplificação da teoria bachtininana do romance polifónico. O autor insere as histórias e as persona gens, geralmente abatidas, pessoas humildes e marginalizadas, na sua terra natal, a Sardenha. A história è estruturada na forma de entrevista a trinta e duas persona gens que com os seus pontos de vista criam una realidade multi-facetada e subjectiva. A vida de Tullio Saba, o protagonista, está narrada às vezes em modo contraditório e, por isso, os factos podem ser divergentes nas opiniões de quem esteve mais ou menos em contacto directo com ele. O uso característico de um instrumento linguístico híbrido, a meio caminho entre o italiano e o sardo, conota não somente o léxico mas também a estruturação inteira do discurso que atinge o efeito final pretendido pelo autor de descrever uma diversa ealidade antropológico-cultural.Palavras chave: romance polifónico, instrumento linguístico híbrido

  15. THE APOCOPE IN THE LOAN WORDS ALINTI KELİMELERDE SON SES DÜŞMESİ

    Directory of Open Access Journals (Sweden)

    Aylin KOÇ

    2010-10-01

    Full Text Available Disappearance is the loss of a sound in structure of the word with some reasons. There are three types of disappearance: apheresis, syncope and apocope. The apocope is disappearance of a vowel or consonant at the end of a word. This situation isn’t standard in whole dialects and accents. Some dropping sounds, have an intense in a spesific region, they aren’t seen in the other areas or have rare examples. This is rather common in the dialects. In this study will be handled the apocope in the loan words with the examples in Turkey Turkish and contemporary Turkish dialects. Bir kelimedeki seslerden birinin, çeşitli nedenlerle düşmesine ses düşmesi denir. Ses düşmesi üç çeşittir: ön ses düşmesi, iç ses düşmesi ve son ses düşmesi. Son ses düşmesi, kelimede son ses durumunda olan ünlü veya ünsüzün düşmesidir. Bu durum, bütün lehçelerde ve ağızlarda standart değildir. Düşen bazı sesler, belli bir bölge içinde yoğunlaşırken, bazı bölgelerde görülmemekte ve hatta birkaç ya da bir örnekle sınırlı kalabilmektedir. Bu daha çok ağızlarda görülür. Çalışmada, Türkiye Türkçesinde ve Çağdaş Türk Lehçelerinde alıntı kelimelerde son ses düşmesi bahsi örnekleriyle ele alınacaktır.

  16. Perfil hormonal de Progesterona durante o ciclo Estral em novilhas Nelore confinadas com Diferentes Ondas de Crescimento Folicular Plasma Progesterone Level during the Estrous Cycle in Nelore Heifers Confined with Two, Three and Four Waves of Follicular Growth

    Directory of Open Access Journals (Sweden)

    Luciene Lomas Santiago

    2001-12-01

    Full Text Available Efetuaram-se coletas diárias de sangue, de 16 novilhas Nelore confinadas, para análise de progesterona plasmática pelo método de radioimunoensaio (RIA. Os dias analisados para progesterona foram o dia zero (estro e a cada três dias até o dia -1 e o dia zero. Os animais foram divididos em dois grupos: 1 com ciclo estral de 21 dias aproximadamente (novilhas que apresentaram duas e três ondas de crescimento folicular e 2 com ciclo estral superior a 25 dias (novilhas com quatro ondas de crescimento folicular. As concentrações médias de progesterona plasmática dos animais durante o ciclo estral diferiram entre os dois grupos, sendo superiores (4,27 ng/mL para os ciclos de maior duração. A concentração média de progesterona no ciclo de aproximadamente 21 dias foi de 2,54 ng/mL. Os resultados sugerem que as novilhas que apresentam maior duração do ciclo estral necessitam de tempo adicional para que seus folículos cheguem ao estádio pré-ovulatório, havendo, dessa maneira, prolongamento e aumento da secreção de progesterona.Blood were collected daily from 16 Nelore heifers confined, for radioimmunoassay (RIA.analyses of progesterone The plasma progesterone assay were at day zero (estrus and at each three days until the -1 and the day zero.again The animals were divided in two groups: 1 with regular estrous cycle of 21 days (heifers with two and three follicular growth waves and 2 with prolonged estrous cycle, greater than 25 days (heifers with four follicular growth waves. The mean plasma progesterone level from the animals during the estrous cycle differed between the two groups, being greater (4,27 ng/mL for the extended cycles.(above 25 days; 4,27 ng/mL than for the regular estrous cycle (21 days; 2,54 ng/mL. Results suggest that those heifers which showed an extended estrous cycles, needs an additional time for the follicles to each the pre-ovulatory stadium, resulting in prolonged and increased progesterone secretion.

  17. AVANCES EN REGENERACIÓN AUDITIVA. ESTADO ACTUAL Y PERSPECTIVAS FUTURAS

    OpenAIRE

    Dr. Juan Cristóbal Maass, PhD; Dra. Francisca Hanuch; Dra. Macarena Ormazábal

    2016-01-01

    La sordera es uno de los defectos congénitos más frecuentes en el mundo y puede llegar a alcanzar hasta un 50% en los adultos mayores de 70 años. La mayor parte de la pérdida de audición se produce por daño en las células ciliadas (CC), que son las encargadas de transformar las ondas acústicas mecánicas en señales electroquímicas que se dirigen al área auditiva de la corteza cerebral. Estas células ubicadas en el órgano de Corti (OC) no tienen capacidad regenerativa, por lo que al verse sever...

  18. Cryptorchidism and hypospadias in sons of gardeners and farmers

    DEFF Research Database (Denmark)

    Weidner, I S; Møller, H; Jensen, Tina Kold

    1998-01-01

    Cryptorchidism and hypospadias have been related to prenatal estrogen exposure in animal models. Some chemicals used in farming and gardening have been shown to possess estrogenic and other hormone-disrupting effects. Earlier studies have indicated increased risks of urogenital malformations...... in the sons of pesticide appliers. In the present study, parental occupation in the farming and gardening industry among 6,177 cases of cryptorchidism, 1,345 cases of hypospadias, and 23,273 controls, born live from 1983 to 1992 in Denmark, was investigated in a register-based case-control study...... of female gardeners could suggest an association with prenatal exposure to occupationally related chemicals....

  19. Investigation on possible risks to human health by exposure to the radiation of electromagnetic waves produced by the radio communications; Investigacion sobre posibles riesgos a la salud humana por exposicion a la radiacion de ondas electromagneticas producidas por las radiocomunicaciones

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Hernandez, Carlos Felipe; Ibarguengoytia Gonzalez, Pablo Hector; Flores Garcia, Andres; Franco Campos, Laura Elena [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2011-06-13

    This verification procedure is based on a research work on the possible risks to human health by exposure to the radiation of electromagnetic waves produced by the radio communications, cases of study: cellular telephony, radio digital troncalized and wireless telephony IP of Voice on IP (wireless local area network). The revision of all the international standards and the applicable national standardization was included, as well as the verification of fulfillment. [Spanish] Este procedimiento de verificacion esta basado en un trabajo de investigacion sobre posibles riesgos a la salud humana por exposicion a la radiacion de ondas electromagneticas producidas por la radiocomunicaciones, casos de estudio: telefonia celular, radio troncalizado digital y telefonia IP inalambrica de Voz sobre IP (red de area local inalambrica). Se incluyo la revision de todos los estandares internacionales y de la normatividad nacional aplicable, asi como la verificacion de cumplimiento.

  20. The Impact of Birth Order on Intergenerational Transmission of Attitudes from Parents to Adolescent Sons: The Israeli Case

    Science.gov (United States)

    Kulik, Liat

    2004-01-01

    This study deals with birth order and its impact on intergenerational transmission of parental attitudes to adolescent sons in Israeli society. The sample included 294 participants (including 98 mothers, 98 fathers, and 98 sons). The attitudes chosen were key issues of concern in Israeli society: gender role attitudes, ethnic stereotypes, and…

  1. Son Excellence Madame Elisabeth Laurin Ambassadeur Représentant permanent de la France auprès de l’Office des Nations Unies et des autres organisations internationales en Suisse République française Son Excellence Monsieur Roberto Balzaretti Ambassadeur Directeur

    CERN Multimedia

    AUTHOR|(CDS)2099575

    2016-01-01

    Son Excellence Madame Elisabeth Laurin Ambassadeur Représentant permanent de la France auprès de l’Office des Nations Unies et des autres organisations internationales en Suisse République française Son Excellence Monsieur Roberto Balzaretti Ambassadeur Directeur,

  2. Formación de porosidad durante la soldadura láser de Nd: YAG de onda continua en aleaciones de aluminio para aplicaciones automotrices

    Directory of Open Access Journals (Sweden)

    Pastor, Mario

    2000-04-01

    Full Text Available Pore formation is an important concern in laser welding of automotive aluminum alloys. This paper investigates the influence of the laser beam defocusing on pore formation during continuous wave Nd: YAG laser welding of aluminum automotive alloys 5182 and 5754. It was found that the instability of the keyhole during welding was a dominant cause of pore formation while hydrogen rejection played an insignificant role. The defocusing of the laser beam greatly affected the stability of the keyhole. Finally, the mechanism of the collapse of the keyhole and pore formation is proposed.

    La formación de poros es un aspecto de gran preocupación durante la soldadura láser de aleaciones de aluminio. En este trabajo se ha investigado la influencia del desenfoque del haz del láser sobre la formación de poros durante la soldadura láser (Nd: YAG de onda continua de las aleaciones de aluminio 5182 y 5754, las mismas que se usan en aplicaciones automotrices. Los resultados obtenidos indicaron que la causa dominante de formación de poros fue la inestabilidad de la cavidad de vapor o keyhole mientras que la influencia del hidrógeno fue prácticamente insignificante. El grado de desenfoque del láser tuvo gran influencia sobre la inestabilidad de la cavidad de vapor. Finalmente, en este artículo se propone el mecanismo de formación de poros a causa del colapso de la cavidad de vapor (keyhole.

  3. A Stylistic Analysis of D.H. Lawrence’s ‘Sons and Lovers’

    Directory of Open Access Journals (Sweden)

    Nozar Niazi

    2013-05-01

    Full Text Available This paper aims at analyzing D.H. Lawrence’s ‘Sons and Lovers’ using a stylistic approach. Stylistics is a study of the amalgamation of form with content. The stylistic analysis of a novel goes beyond the traditional, intuitive interpretation, because it combines intuition and detailed linguistic analysis of the text. The defining elements of modern language are within the text itself, not prescribed from outside. With modernist texts, usually understanding comes from close study of the language system defined within the text itself. Form, technique and style are considered not as a mere vehicle of the content of the story, but an integral part of the work’s meaning and value. In our analysis of ‘Sons and Lovers’ the resources of language: lexis, syntax, phonology, figurative language, cohesion and coherence, are discussed in relation to the style of discourse in order to explore hidden meanings in the text. The resources of language are shown to be an essential part of the meaning of the novel.

  4. Representations of the algebra Uq'(son) related to quantum gravity

    International Nuclear Information System (INIS)

    Klimyk, A.U.

    2002-01-01

    The aim of this paper is to review our results on finite dimensional irreducible representations of the nonstandard q-deformation U q ' (so n ) of the universal enveloping algebra U(so(n)) of the Lie algebra so(n) which does not coincide with the Drinfeld-Jimbo quantum algebra U q (so n ).This algebra is related to algebras of observables in quantum gravity and to algebraic geometry.Irreducible finite dimensional representations of the algebra U q ' (so n ) for q not a root of unity and for q a root of unity are given

  5. Aplicação da técnica de simulação para análise da superposição de ondas sísmicas geradas em desmonte de rocha pela dispersão dos tempos de retardo utilizando o método de Monte Carlo

    OpenAIRE

    Klen, André Monteiro

    2010-01-01

    Este trabalho é resultado de um estudo através de simulação baseada no Método de Monte Carlo, da relação que existe entre a dispersão dos tempos de retardo dos acessórios de iniciação e elementos de retardos de superfície com o excesso de vibração provocado pela superposição de ondas sísmicas em atividades de desmonte de rocha por explosivo em lavra a céu aberto. As conclusões foram desenvolvidas a partir dos resultados gerados pela simulação de diferentes planos de fogo, constituídos por ret...

  6. The (un) making of a man: fathers and sons in the African novel

    African Journals Online (AJOL)

    Lipenga

    Things Fall Apart (1958), Zakes Mda's The Sculptors of. Mapungubwe ... The important thing to note in his analysis is his highlighting of the various ... to this discussion – of a farmer (strong, hard-working, strict) who is contrasted with his son ...

  7. 6j-symbols for symmetric representations of SO(n) as the double series

    International Nuclear Information System (INIS)

    Alisauskas, Sigitas

    2002-01-01

    The corrected triple sum expression of Alisauskas (1987 J. Phys. A: Math. Gen. 20 35) for the recoupling (Racah) coefficients (6j-symbols) of the symmetric (most degenerate) representations of the orthogonal groups SO(n) (previously derived from the fourfold sum expression of Alisauskas also related to the result of Hormess and Junker (1999 J. Phys. A: Math. Gen. 32 4249) is rearranged into three new different double sum expressions (related to the hypergeometric Kampe de Feriet type series) and a new triple sum expression with preferable summation condition. The Regge type symmetry of special 6j-symbols of the orthogonal groups SO(n) in terms of special Kampe de Feriet F 1:4 1:3 series is revealed. The recoupling coefficients for antisymmetric representations of symplectic group Sp(2n) are derived using their relation with the recoupling coefficients of the formal orthogonal group SO(-2n)

  8. Mate-sampling costs and sexy sons.

    Science.gov (United States)

    Kokko, H; Booksmythe, I; Jennions, M D

    2015-01-01

    Costly female mating preferences for purely Fisherian male traits (i.e. sexual ornaments that are genetically uncorrelated with inherent viability) are not expected to persist at equilibrium. The indirect benefit of producing 'sexy sons' (Fisher process) disappears: in some models, the male trait becomes fixed; in others, a range of male trait values persist, but a larger trait confers no net fitness advantage because it lowers survival. Insufficient indirect selection to counter the direct cost of producing fewer offspring means that preferences are lost. The only well-cited exception assumes biased mutation on male traits. The above findings generally assume constant direct selection against female preferences (i.e. fixed costs). We show that if mate-sampling costs are instead derived based on an explicit account of how females acquire mates, an initially costly mating preference can coevolve with a male trait so that both persist in the presence or absence of biased mutation. Our models predict that empirically detecting selection at equilibrium will be difficult, even if selection was responsible for the location of the current equilibrium. In general, it appears useful to integrate mate sampling theory with models of genetic consequences of mating preferences: being explicit about the process by which individuals select mates can alter equilibria. © 2014 European Society For Evolutionary Biology. Journal of Evolutionary Biology © 2014 European Society For Evolutionary Biology.

  9. Literature as an exploration of the phenomenology of schizophrenia: disorder and recovery in Denis Johnson's Jesus' Son.

    Science.gov (United States)

    Hamm, Jay A; Leonhardt, Bethany L; Fogley, Rebecca L; Lysaker, Paul H

    2014-12-01

    When read as a fictional psychosis narrative, Jesus' Son, a collection of short stories by Denis Johnson, reveals important elements of the phenomenology of schizophrenia and recovery. It is possible that Jesus' Son, as a work of fiction, may be able to uniquely add depth and nuance to an understanding of the phenomenology of schizophrenia involving a state of psychological fragmentation, an ever-changing interpersonal field and a loss of personal agency. In addition, by following the protagonist in Jesus' Son as he begins to resolve some of his difficulties, the book also offers an individualised account of recovery. The authors detail how the book reveals these insights about schizophrenia and recovery and suggest that these elements are intertwined in such a manner that leads to a profound disruption of self-experience, characterised by a collapse of metacognitive processes. Jesus' Son may add depth to our understanding of the subjective experience of schizophrenia and recovery, and also may serve as one example in which the study of humanities offers an opportunity to explore the human elements in the most profound forms of suffering. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

  10. Estudo da eficiência das ondas de ultra-som em relação ao hipoclorito de sódio e à filtração adsorção na eliminação de microrganismos em estação de tratamento de água

    OpenAIRE

    Bello, Antonio Roberto Crystal [UNESP

    2003-01-01

    Este estudo realizado em mini Estação de Tratamento de Água (ETA-CB) relata a comparação entre diferentes processos como ondas ultra-sônicas, cloração e filtração-adsorção na eliminação de microrganismos e adequação de outros parâmetros exigidos para água de abastecimento público. Para avaliar a influência de cada processo de desinfecção e também dos processos de coagulação - floculação, decantação e filtração foi projetada e construída uma ETA em escala piloto, constituída de caixa de entrad...

  11. Parents' perceptions of their adolescent sons' recovery in a therapeutic community for addicted clients.

    Science.gov (United States)

    Chen, Gila; Elisha, Ety; Timor, Uri; Ronel, Natti

    2013-11-01

    A qualitative phenomenological study of parents of addicted male adolescents who were residents of a Jewish therapeutic community (TC) describes and interprets the parents' perceptions of the recovery process. Deep, semistructured interviews with 14 parents provided the data. The parents' perceptions were clustered into three main themes of meaning: (a) the process of change, (b) the experiences of family members in the course of the son's recovery process, and (c) the parents' perception of the treatment at Retorno. According to the parents, the admission of their sons into the TC brought notable relief to the family life, which enabled the whole family to begin a recovery process. The findings support the positive criminology perspective that emphasizes the disintegration-integration vector as significant in the recovery process. Recommendations for intervention planning are provided.

  12. Estudo comparativo entre a aplicação de crioterapia, cinesioterapia e ondas curtas no tratamento da osteoartrite de joelho Comparison of cryotherapy, exercise and short waves in knee osteoarthritis treatment

    Directory of Open Access Journals (Sweden)

    Adriana Lucia Pastore Silva

    2007-01-01

    Full Text Available A osteoartrite é a forma mais prevalente de doença articular. Os agentes físicos como o gelo e o calor podem combater o processo álgico quando corretamente indicados e utilizados. O objetivo deste trabalho foi a comparação de protocolos de tratamento fisioterapêutico, que envolveram o uso de cinesioterapia, crioterapia e ondas curtas, em indivíduos com osteoartrite de joelho. Em um estudo randomizado prospectivo cego foram tratados 25 indivíduos (25 joelhos, de 58 a 78 anos. GRUPO A: cinesioterapia e ondas curtas (n=9. GRUPO B: cinesioterapia e gelo (n=6. GRUPO C: cinesioterapia (grupo controle (n=9. As variáveis analisadas foram: percepção subjetiva de dor (Borg, qualidade funcional (Lequesne, amplitude de movimento, flexibilidade e força muscular. A dor melhorou significativamente somente no grupo B, com qualidade funcional e flexibilidade positiva em todos grupos. O ganho de amplitude foi semelhante nos grupos B e C. Houve manutenção da força flexora nos grupos A e B e ganho nos indivíduos do grupo C. Na musculatura extensora observou-se ganho de força no grupo B e C e perda no grupo A. O melhor protocolo foi aquele que envolveu a aplicação de gelo e cinesioterapia para analgesia; não houve relação de ganho de amplitude, flexibilidade e força associado a termoterapia.Osteoarthritis is the most prevalent form of joint disease. Physical agents such as ice and heat can fight the pain process, when correctly indicated and used. The objective of this study was to compare physiotherapy protocols involving the use of exercise, cryotherapy and short waves in individuals with knee osteoarthritis. In a prospective randomized study, 25 individuals were treated (25 knees, with ages ranging from 58 to 78 years. GROUP A: exercise and short-waves (n=9. GROUP B: exercise and ice (n=6. GROUP C: exercise alone (control (n=9. Analyzed variables were: subjective perception of pain (Borg, functional quality (Lequesne, range of motion

  13. The Quest for the Whole in D. H. Lawrence’s Sons and Lovers

    Directory of Open Access Journals (Sweden)

    Nesar Uddin

    2013-10-01

    Full Text Available David Herbert Lawrence portrays a complex husband-wife, mother-son, and man-woman relationship in his novel Sons and Lovers. This article studied the relational motifs of the major character Paul Morel with other characters and the dire upshot resulting from this relation. The study found that Paul strove for happiness through the concerted entertainment of body and soul with his beloved people, but he failed because his mother’s unusual attachment to him negatively impacted on his building up a normal relation with others. Mother’s failure to find happiness in her conjugal life led her to pouring her love into Paul, exploiting him, making him sub-serve her own need and denying him the right to his own independent life. As a result, the son’s relation with other women proved a disastrous failure. The women with whom Paul had relation underwent part of the sufferings somehow or other. Finally, Mother’s death made him hopeless and left his life in nothingness.

  14. Borgring sæson 1 - Vold, brand og ødelæggelse

    DEFF Research Database (Denmark)

    Ulriksen, Jens; Christensen, Jonas; Holm, Nanna

    2017-01-01

    son 1 af Borgringprojektet er overstået – i hvert fald i marken. Efter måneders planlægning, både blandt arkæologer og formidlingsfolk, kunne Hendes Majestæt Dronningen officielt åbne den publikumsorienterede del af forskningsprojektet den sidste dag i maj 2016. Gennem de følgende tre måneder bl...

  15. Multivariate Multiple Regression Models for a Big Data-Empowered SON Framework in Mobile Wireless Networks

    Directory of Open Access Journals (Sweden)

    Yoonsu Shin

    2016-01-01

    Full Text Available In the 5G era, the operational cost of mobile wireless networks will significantly increase. Further, massive network capacity and zero latency will be needed because everything will be connected to mobile networks. Thus, self-organizing networks (SON are needed, which expedite automatic operation of mobile wireless networks, but have challenges to satisfy the 5G requirements. Therefore, researchers have proposed a framework to empower SON using big data. The recent framework of a big data-empowered SON analyzes the relationship between key performance indicators (KPIs and related network parameters (NPs using machine-learning tools, and it develops regression models using a Gaussian process with those parameters. The problem, however, is that the methods of finding the NPs related to the KPIs differ individually. Moreover, the Gaussian process regression model cannot determine the relationship between a KPI and its various related NPs. In this paper, to solve these problems, we proposed multivariate multiple regression models to determine the relationship between various KPIs and NPs. If we assume one KPI and multiple NPs as one set, the proposed models help us process multiple sets at one time. Also, we can find out whether some KPIs are conflicting or not. We implement the proposed models using MapReduce.

  16. BALTIMORE’S M.S. LEVY AND SONS: Straw Hat Makers to the World, 1870-1960

    Directory of Open Access Journals (Sweden)

    Jessica I. Elfenbein

    2008-01-01

    Full Text Available From 1860 to 1960, Baltimore was an important center of the men’s ready-to- wear clothing industries. German-speaking Jews created many businesses that manufactured and sold underwear, men’s suits, and specialty items like hats and umbrellas. The straw hat making firm started by M.S. Levy is an interesting example of a Baltimore-based, family-owned niche business that existedfor 90 years, through three generations ofa singlefamily. The M.S. Levy and Sons story has two main chapters. The first covers the period from its founding by Michael Simon Levy in the 1870s through his son Julius’ death in 1926. This is the story of ascension. A premonition about the coming popularity of straw hats, together with a small but important technological breakthrough, positioned a family and a small industry for significant expansion. The second period began in 1930 with the introduction of wool felt hats and the death of William, M.S. Levy’s oldest son, and includes the Great Depression, unionization, merger, third generation leadership, and finally, in 1959, the family’s withdrawal from the industry. This later period, as told by grandsons of the founder, is the story of struggle followed by decline.

  17. The iron swords from the necropolis of Son Pellisser; preliminary advance

    Directory of Open Access Journals (Sweden)

    Agustín Fernández Mártinez

    2016-11-01

    Full Text Available This paper submits the iron swords from the necropolis of Son Pellisser (Calvià-Majorca. Although the materials that we find are numerous and still under research offer a preliminary study about three imported swords, found in burial objects, also their possible origin and way of introduction on the island. These weapons could be the first archaeological evidence that the Balearic mercenaries participated in the Wars of Sicily, between Carthaginians and Greeks, from the fifth century BC.

  18. From Here to There and Back Again: The Story of a Mother, Her Son, Disability, and School Choice

    Science.gov (United States)

    Mann, Glenys

    2016-01-01

    Nelly and her children live in Queensland, Australia. When it came time for her second youngest son to start school, Nelly was not prepared for the difficulty that she had enrolling him at the school of her choice. In spite of her son's disability, Nelly thought that it was natural that he would go to his local school with his sister. It is not…

  19. The (un) making of a man: fathers and sons in the African novel

    African Journals Online (AJOL)

    Lipenga

    This perspective enables a reading of the texts as not merely depicting ... level, these texts reveal a structural trend where the relationship between the .... recipient of the teaching of masculinity, as Okonkwo's adopted son. .... from a feminist point of view, but in Mapungubwe, the norm is that a woman ..... critical dualism.

  20. Le glaive et la chair : le pouvoir et son incarnation au temps des derniers Valois

    OpenAIRE

    Roux, Nicolas Le

    2014-01-01

    Au xvie siècle, pouvait-on concevoir la monarchie autrement qu’incarnée ? Servir le roi, c’était servir un prince auquel on était lié personnellement, et non une institution abstraite. Le monarque devait apparaître comme un compagnon pour la noblesse militaire. Henri II représentait le modèle du roi chevalier. Contrairement à son père, Charles IX ne faisait pas la guerre, mais il épuisait son corps dans d’interminables chasses. Henri III a tenu dans sa jeunesse le rôle de chef de guerre. Deve...

  1. Estimativa da radiação de onda longa atmosférica em áreas de floresta e de pastagem no sudoeste da Amazônia Estimate of the atmospheric long wave radiation in forest and pasture area in south west amazon

    Directory of Open Access Journals (Sweden)

    Leonardo José Gonçalves Aguiar

    2011-06-01

    Full Text Available A radiação de onda longa proveniente da atmosfera (Lin é a componente do balanço de radiação mais difícil de ser medida. Na Amazônia praticamente não existem medidas regulares dessa componente, mesmo sendo uma importante variável no cálculo do balanço de radiação à superfície e muito usada para alimentar modelos climáticos. Tendo em vista a necessidade desses dados, o objetivo do presente trabalho é avaliar o desempenho de sete equações na estimativa da Lin para dias de céu claro em áreas de floresta (Reserva Biológica do Jaru, 10º4'48''S; 61º55'48''W e de pastagem (Fazenda Nossa Senhora, 10º45'S; 62º21'W no sudoeste da Amazônia. Medidas de radiação de onda longa atmosférica realizadas no período de junho de 2005 a maio de 2006 foram comparadas com as estimativas. As equações testadas tiveram desempenho satisfatório apenas durante a estação seca. As condições de alta nebulosidade, dominantes na estação chuvosa, restringiram a quantidade de dados utilizados na avaliação das equações. As equações que utilizam informações de temperatura do ar e pressão de vapor d'água para a estimativa da Lin tiveram melhor desempenho em relação às que utilizam apenas a temperatura do ar. As equações de Brutsaert (1975, Idso (1981 e Prata (1996 foram as que apresentaram melhor desempenho, apresentando os maiores índices de concordância, e sendo, portanto, as equações mais indicadas para a estimativa da radiação de onda longa atmosférica no sudoeste da Amazônia.Atmospheric long wave radiation (Lin is the most difficult component of the radiation budget to be measured. In Amazonia there are very few regular measurements of this component, even though it is an important variable in the calculation of the surface radiation balance and frequently used in climate models. Given the need for such data, the objective of this study is to evaluate the performance of seven equations used for the estimation of Lin

  2. Transgenerational effects of nutrition are different for sons and daughters.

    Science.gov (United States)

    Zizzari, Z V; van Straalen, N M; Ellers, J

    2016-07-01

    Food shortage is an important selective factor shaping animal life-history trajectories. Yet, despite its role, many aspects of the interaction between parental and offspring food environments remain unclear. In this study, we measured developmental plasticity in response to food availability over two generations and tested the relative contribution of paternal and maternal food availability to the performance of offspring reared under matched and mismatched food environments. We applied a cross-generational split-brood design using the springtail Orchesella cincta, which is found in the litter layer of temperate forests. The results show adverse effects of food limitation on several life-history traits and reproductive performance of both parental sexes. Food conditions of both parents contributed to the offspring phenotypic variation, providing evidence for transgenerational effects of diet. Parental diet influenced sons' age at maturity and daughters' weight at maturity. Specifically, being born to food-restricted parents allowed offspring to alleviate the adverse effects of food limitation, without reducing their performance under well-fed conditions. Thus, parents raised on a poor diet primed their offspring for a more efficient resource use. However, a mismatch between maternal and offspring food environments generated sex-specific adverse effects: female offspring born to well-fed mothers showed a decreased flexibility to deal with low-food conditions. Notably, these maternal effects of food availability were not observed in the sons. Finally, we found that the relationship between age and size at maturity differed between males and females and showed that offspring life-history strategies in O. cincta are primed differently by the parents. © 2016 European Society For Evolutionary Biology. Journal of Evolutionary Biology © 2016 European Society For Evolutionary Biology.

  3. Estudio de la respuesta de circuitos RLC a diversos tipos de señal de entrada, diseñado, construido, e implementado como un equipo autónomo de uso didáctico

    OpenAIRE

    Peña Estupiñan, Diana Milena

    2010-01-01

    En el análisis de las señales de circuitos RLC se aplican diferentes métodos para su estudio. Las instituciones de Educación Media y Universidades lo enfocan al análisis de la respuesta del circuito a la señal de onda impulso y onda cuadrada. Debido a lo apretado de los currículos y otras circunstancias, esta actividad no se realiza en clase y se deja como tarea al estudiante las respuestas de los circuitos a ondas seno, escalón y otras. El presente trabajo pretende realizar este análisis uti...

  4. Indices ecodopplercardiográficos de função diastólica de gatos saudáveis não sedados

    Directory of Open Access Journals (Sweden)

    Soares Elaine Cristina

    2005-01-01

    Full Text Available O propósito deste estudo foi determinar os parâmetros de velocidades de ondas E e A, relação E/A, tempo de desaceleração da onda E e TRIV em gatos normais e não sedados, bem como correlacionar tais índices com a freqüência cardíaca. Estudaram-se 40 gatos hígidos, adultos, abrigados no gatil da Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo. O exame foi realizado com os animais contidos em decúbito lateral esquerdo. Para cada parâmetro, obtiveram-se média, desvio padrão, mediana, intervalo interquartílico e amplitude total. Observou-se boa correlação entre a frequência cardíaca e a velocidade da onda E, relação E/A e TRIV, ao passo que o tempo de desaceleração da onda E e a velocidade da onda A não foram influenciados pela freqüência cardíaca. Os índices determinados permitirão caracterizar o padrão de anormalidade diastólica, freqüentemente associados às cardiomiopatias em felinos.

  5. When the Least Restrictive Environment is Residential: Meeting the Needs of Our Son

    Science.gov (United States)

    Morris, Djenne-Amal

    2013-01-01

    In this article, the author, a parent of Malik, a special needs child with CHARGE Syndrome, describes the difficulties she encountered with her local educational agency (LEA) in transitioning her son from the Perkins School for the Blind in Watertown, Massachusetts to the Eastern North Carolina School for the Deaf (ENCSD). At ENCSD, Malik now…

  6. Ahn and Son Afr J Tradit Complement Altern Med. (2014) 11(1):28 ...

    African Journals Online (AJOL)

    cadewumi

    Ahn and Son Afr J Tradit Complement Altern Med. (2014) 11(1):28-29 ... The comparisons of the frequency and choice of functional supplements were analysed using Chi-square test with. SPSS (SPSSs 18.0K for ... Significant difference of choice for functional supplements was observed between male and female (p < 0.01) ...

  7. Avaliação da onda b do eletrorretinograma na Athene cunicularia Evaluation of the b-wave electroretinogram in Athene cunicularia

    Directory of Open Access Journals (Sweden)

    Márcio Penha Morterá Rodrigues

    2008-12-01

    Full Text Available OBJETIVO: Avaliar a onda b do eletrorretinograma da coruja buraqueira (Athene cunicularia, diferenciando a resposta elétrica retiniana em ambiente fotópico e escotópico. MÉTODOS: Foi realizado estudo observacional transversal, com o registro do eletrorretinograma full field de quatorze olhos, sendo sete estimulados em ambiente fotópico e sete em ambiente escotópico sob estímulo com luz branca seguindo protocolo da ISCEV. RESULTADOS: As respostas elétricas da retina da espécie estudada para o espectro de luz aplicado mostraram-se presentes em ambos ambientes, não havendo diferença estatisticamente significativa da resposta elétrica da retina da Athene cunicularia quando estimulada com luz branca, tanto em ambiente escotópico quanto fotópico. CONCLUSÃO: Os dados nos permitem, portanto, inferir que a percepção pela Athene cunicularia da cor branca é a mesma, no claro e no escuro, o que pode ser responsável pela capacidade adaptativa da espécie no seu habitat natural.PURPOSE: To evaluate b-wave of the electroretinogram of the burrowing owl (Athene cunicularia, differentiating the retinal electric reply in photopic and scotopic environment. METHODS: Transversal observational study was carried through, with the register of the full field electroretinogram of fourteen eyes; seven were stimulated in photopic environment and seven in scotopic environment using with white light according to the ISCEV protocol. RESULTS: The electrical responses of the retina of the species studied showed no statistically significant difference for the applied spectrum of white light in both scotopic photopic environments. CONCLUSION: The data allow us, therefore, to infer that the perception of the Athene cunicularia of the white color is the same one, in clear and dark environments, what it can be responsible for the adaptive capacity of the species in their natural habitat.

  8. Young Children’s Risk-Taking: Mothers’ Authoritarian Parenting Predicts Risk-Taking by Daughters but Not Sons

    Directory of Open Access Journals (Sweden)

    Erin E. Wood

    2017-01-01

    Full Text Available We investigated how mothers’ parenting behaviors and personal characteristics were related to risk-taking by young children. We tested contrasting predictions from evolutionary and social role theories with the former predicting higher risk-taking by boys compared to girls and the latter predicting that mothers would influence children’s gender role development with risk-taking occurring more in children parented with higher levels of harshness (i.e., authoritarian parenting style. In our study, mothers reported their own gender roles and parenting styles as well as their children’s risk-taking and activities related to gender roles. The results were only partially consistent with the two theories, as the amount of risk-taking by sons and daughters did not differ significantly and risk-taking by daughters, but not sons, was positively related to mothers’ use of the authoritarian parenting style and the girls’ engagement in masculine activities. Risk-taking by sons was not predicted by any combination of mother-related variables. Overall, mothers who were higher in femininity used more authoritative and less authoritarian parenting styles. Theoretical implications as well as implications for predicting and reducing children’s risk-taking are discussed.

  9. The Son's Fault: Martin Luther King, Jr.'s Search for and Recovery of Sonship.

    Science.gov (United States)

    Hinds, Jay-Paul

    2018-04-01

    This article examines the role of sonship in the psychological and spiritual development of men. In using the methodology of psychobiography, I explore the life history of Martin Luther King, Jr. to analyze his search for and recovery of sonship. I propose that sonship helps men rebel against and, in the end, overcome the feelings of inadequacy that are experienced in their struggles to achieve manhood, particularly within the father-son dyad. The scholarship of pastoral theologian Donald Capps is instructive in this regard, in that he suggests that sons should be allowed to search for a male figure, a father-substitute, who can affirm, not disdain or reject, this state of sonship. In the end, what is often viewed as a negative act of regression-i.e., the recovery of and return to sonship-is recognized instead as a positive one that assists a man in his journey toward wholeness.

  10. A Female Patient with FMR1 Premutation and Mosaic X Chromosome Aneuploidy and Two Sons with Intellectual Disability.

    Science.gov (United States)

    Galanina, Ekaterina M; Tulupov, Andrey A; Lemskaya, Natalya A; Korostyshevskaya, Aleksandra M; Maksimova, Yuliya V; Shorina, Asia R; Savelov, Andrey A; Sergeeva, Irina G; Isanova, Evgeniya R; Grishchenko, Irina V; Yudkin, Dmitry V

    2017-03-01

    In this report, we describe a molecular cytogenetic study of a family burdened with intellectual disability (ID) and suicide. Our study revealed that the mother has a heterozygous premutation in the FMR1 gene and supernumerary X chromosomes as well as X-derived marker chromosomes. Both of her sons have ID and a normal chromosome number. One of the sons has fragile X syndrome, and the other has ID of an unclear nature.

  11. La cucharilla diatérmica en el tratamiento del cáncer

    Directory of Open Access Journals (Sweden)

    Roberto Restrepo

    1946-03-01

    Full Text Available Frecuentemente se halla el radioterapeuta con masas cancerosas ulceradas, focos de infección que le presentan dificultades para un tratamiento adecuado. Estas masas son a veces obstáculo para aplicaciones correctas de rayos X, porque la masa misma, por su espesor, impide el paso de muchas radiaciones cuando se usan rayos de larga longitud de onda. Así, para hacer llegar suficiente dosis a la parte central de un cáncer, como hay que irradiar también tejido sano en el margen, a este último llega una cantidad grande de radiaciones que ponen en peligro su integridad, cuando a la base del tumor sólo ha llegado uan parte insuficiente de radiaciones, que a veces no alcanza a ser cancericida, a menos que se acudiera al método de fuegos cruzados, que larga el tratamiento y expone a la superposición de campos con todos sus inconvenientes. Y cuando se usa un aparato de pasta con radio las dificultades son a veces de orden mecánico.

  12. La gravitación como fenómeno cuántico

    OpenAIRE

    Moya Álvarez, Douglas Ernesto

    1994-01-01

    Se encuentra la ley de la gravitación universal de Newton a partir de un proceso de interferencia de las funciones de onda asignadas a dos atractores extraños de ondas no lineales de acción, que se hallan separados por una distancia R.

  13. "Fathers and Sons" in Xenophon's Teaching of the Man Taking Care of Himself

    Science.gov (United States)

    Pichugina, Victoria; Bezrogov, Vitaly

    2017-01-01

    This article considers the oeuvre of Xenophon (c.430-354 bc) as providing an insight into the concept of "care of the self" in Greek education. In many of his works the leading characters are men who take care of themselves through education. Addressing the theme of "fathers and sons," Xenophon aimed to show that "care of…

  14. Todos los viajes el viaje: teoría y práctica de la literatura en movimiento de Jorge Carrión

    Directory of Open Access Journals (Sweden)

    Sheila Pastor

    2017-01-01

    Full Text Available El presente artículo tiene como objetivo recorrer la poética viajera de Jorge Carrión. Para ello, es fundamental tener en cuenta que el autor no ha abordado el tema únicamente desde la literatura sino también desde una perspectiva teórica, circunstancia que confiere a su obra un doble compromiso con el viaje como representación del mundo y como práctica artística. Se propone un estudio conjunto de cuatro de sus libros de viaje que, partiendo de cuatro coordenadas comunes y mediante el desplazamiento intelectual que implica todo movimiento físico, alcanzan destinos espaciales y textuales diferentes.

  15. À chacun son puzzle

    Directory of Open Access Journals (Sweden)

    Jean-Noël Ferrié

    2012-05-01

    Full Text Available Le texte soutient que le « tournant naturaliste » que l’on nous invite à négocier ne donne aucun moyen supplémentaire pour parvenir à une description perspicace de ce que les gens font dans des circonstances précises, l’existence humaine pouvant être considérée comme une collection de circonstances précises. Sans doute le naturalisme nous permet-il de comprendre comment certaines actions humaines sont possibles, mais cela ne nous dit pas pourquoi et comment elles font sens pour tout un chacun. La méthodologie nécessaire pour éclaircir le premier point obscurcit généralement le second. Le mieux est donc de considérer que les deux approches ne vont pas de pair. Ce point de vue est soutenu à partir d’exemple tirés de l’anthropologie de la religion.To each one his puzzle. For a serene methodological pluralismThe text argues that the « naturalistic turn » that we are invited to negotiate does not give any additional means to achieve an insightful description of what people do in specific circumstances, and human existence can be considered as a collection of specific circumstances. Probably naturalism allows us to understand how some human actions are possible, but that does not tell us why and how they make sense for everyone. The methodology needed to clarify the first point usually obscures the second one. The best way is to consider that the two approaches do not go together. The text supports this view from an example drawn from the anthropology of religion.A cada uno su rompecabezas. En favor de un pluralismo metodológico serenoEl texto argumenta que la inflexión naturalista a la que se nos invita a participar no proporciona ningún medio suplementario que desemboque en una descripción perspicaz de lo que la gente hace en circunstancias concretas ya que la existencia humana puede ser considerada como una concatenación de circunstancias concretas. Sin duda el naturalismo nos permite comprender como son

  16. AVALIAÇÃO FÍSICO-QUÍMICA DE HAMBÚRGUER DE CARNE BOVINA E DE FRANGO SUBMETIDOS A DIFERENTES PROCESSAMENTOS TÉRMICOS

    Directory of Open Access Journals (Sweden)

    Cristiane Maria de BORBA

    2013-01-01

    Full Text Available Neste experimento, objetivou-se avaliar a qualidade físico-química de hambúrgueres de carne bovina e de frango submetidos a diferentes tratamentos térmicos: cozimento em micro-ondas, forno convencional e fritura. Composição centesimal e rendimento, percentual de perda de peso e grau de encolhimento (retração, foram avaliados. As análises foram realizadas em triplicata. O método micro-ondas foi o que apresentou as maiores perdas de umidade, peso e maior grau de retração para os dois tipos de carne estudados. Tanto para hambúrguer de carne bovina como de frango o maior percentual de proteínas e cinzas foi encontrado no método micro-ondas, no entanto o percentual de lipídios foi maior no método micro-ondas para hambúrguer de frango e no frito para hambúrguer de carne bovina.

  17. Las computadoras ¿son buenas o malas para los niños?

    Directory of Open Access Journals (Sweden)

    Revista Chasqui

    2015-01-01

    Full Text Available Se trabaja sobre un estudio del Instituo Argentino de Computación. Sobre las computadoras hay criterios opuestos unos las defienden y otros las atacan, pero lo cierto es que éstas no son ni buenas ni malas para los niños. Da a los padres y maestros advertencias sobre los riesgos. Informa sobre el programa Kidkey que ayuda a fijar el tiempo de conexión a Internet.

  18. Detection de la fin de la compaction des anodes par le son

    Science.gov (United States)

    Sanogo, Bazoumana

    L'objectif de ce projet etait de developper un outil de controle en temps reel du temps de compaction en se servant du son genere par le vibrocompacteur pendant le formage des anodes crues. Ainsi, une application a ete developpee pour l'analyse des sons enregistres. Des essais ont ete realises avec differents microphones pour une meilleure qualite des mesures et un a ete choisi pour la suite du projet. De meme, differents tests ont ete realises sur des anodes de laboratoire ainsi que des anodes a l'echelle industrielle afin de mettre en place une methode pour la detection du temps optimal necessaire au formage des anodes. Les travaux au laboratoire de carbone a l'Universite du Quebec a Chicoutimi (UQAC) ont consiste a l'enregistrement de son des anodes fabriquees sur place avec differentes configurations; et a la caracterisation de certaines anodes de l'usine. Les anodes fabriquees au laboratoire sont reparties en deux groupes. Le premier regroupe les anodes pour la validation de notre methode. Ce sont des anodes produites avec des temps de compaction differents. Le laboratoire de carbone a l'UQAC est unique et il est possible de produire des anodes avec les memes proprietes que celles des anodes industrielles. Par consequent, la validation initialement prevue a l'usine a ete effectuee avec les anodes de laboratoire. Le deuxieme groupe a servi a etudier les effets des matieres premieres sur le temps de compaction. Le type de coke et le type de brai ont constitue les differentes variations dans ce deuxieme groupe. Quant aux tests et mesures a l'usine, ils ont ete realises en trois campagnes de mesure. La premiere campagne en juin 2014 a servi a standardiser et a trouver le meilleur positionnement des appareils pour les mesures, a regler le logiciel et a faire les premieres mesures. Une deuxieme campagne en mai 2015 a fait l'objet d'enregistrement de son en classant les anodes selon differents temps de compaction. La troisieme et derniere campagne en decembre 2015 a

  19. Meaning of becoming mother and son/daughter through massage

    Directory of Open Access Journals (Sweden)

    Francisca Márquez Doren

    2014-06-01

    Full Text Available Objective: Revealing the experience of mothers when massaging their children to know the phenomenon in the context of a mother-child healthy development. Method: This is a qualitative study with a phenomenological approach carried out with 11 women who massaged their children and answered the guiding question: What did the experience of massaging your child mean to you? Results: The experience of massaging their children meant the development of their being a mother and of being a son/daughter, in addition to developing the attachment relationship between them. The massage can operationalize this integrality, become a tool of communication, stimulation and promotion of secure attachment, by promoting the loving interaction between mother and child. Conclusion: This practice should be considered as an option in the programs that promote the comprehensive health of the mother and child.

  20. Compared study of the local structure of alteration products of SON 68 glass and natural gels; Etude comparee de la structure locale des produits d'alteration du verre SON 68 et de gels naturels

    Energy Technology Data Exchange (ETDEWEB)

    Pellegrin, E

    2000-07-01

    This study is a contribution in the understanding of the long time behavior of alteration products of the glass SON 68, used to simulate the nuclear glass R7T7. The local structure around Zirconium and iron has been probed using X-ray absorption spectroscopy in altered surface layer of glass SON 68. Alteration products of this glass have been prepared for short (3 hours to 7 days) and long (17 months) time, using various indexes of saturation for the leaching solution with respect to the Si content of the glass (from 0 to 90 %). The evolution of the local structure around Fe has also been studied in recent and old natural ferric gels. Zr, Fe- L{sub 2,3} XANES and Zr, Fe-K EXAFS spectroscopies have shown that, in the pristine glass, these elements are connected to the polymeric network. Zr is found in an environment close to that of a zircon-silicate containing Na and Ca. Trivalent Fe is a network former. The leached layer of glass SON 68 is constituted of poorly ordered Zr-and Fe-(oxi-hydr)oxides that may have been formed by a mechanism of dissolution/precipitation; a relict phase with the same Zr local structure as that observed in the pristine glass, probably obtained thanks to in-situ solid condensation. The structural characteristics of the leached layer are observed from the first steps of alteration for Zr and Fe. Conversely to Fe, the structural status of Zr depends on the leaching kinetic as well as the contents of Ca and Si in the solid. Fe-K EXAFS results in recent natural ferri-hydrides present a clear structural similarity with that determined in glass SON 68 leached products. The study of old paleosols (between 1,800 and 200,000 years) has demonstrated the long time stability of ferric gels, although an increase of medium range order around Fe is seen. (author)

  1. Death of a son is associated with risk of suicide among parous women in Taiwan: a nested case-control study.

    Science.gov (United States)

    Chen, Chih-Cheng; Kuo, Chien-Chun; Wu, Trong-Neng; Yang, Chun-Yuh

    2012-01-01

    The impact of the sex of a deceased child on maternal suicide has not been studied. We examined whether the death of a child, especially a son, increased the risk of suicide among parous Taiwanese women. This matched case-control study was done within a cohort of 1 292 462 Taiwanese women who experienced a first and singleton childbirth between 1 January 1978 and 31 December 1987 and were followed up until 31 December 2008. From the cohort, 2701 suicide cases were identified and 2701 controls were randomly selected. Multiple logistic regression was used to estimate the risk of suicide associated with the death of a child. The adjusted odds ratios (ORs) for suicide among mothers whose son had died were 2.60 (95% CI = 1.18-5.73), 2.58 (1.28-5.20), and 4.20 (0.79-22.45) for death of a son aged younger than 1 year, 1 to 17 years, and 18 years or older. The ORs for suicide associated with the death of a daughter were not statistically significant: the respective adjusted ORs were 1.86 (0.82-4.62), 1.38 (0.54-3.49), and 2.48 (0.40-15.51). The death of a child, especially a son, increased the risk of maternal suicide, which supports the notion that preference for a son is firmly rooted in traditional Chinese culture.

  2. State supervision of SONS in the mammographic departments

    International Nuclear Information System (INIS)

    Jursikova, E.; Kodl, O.

    2008-01-01

    State Office for Nuclear Safety has been performed the state supervision over radiation protection at all mammographic centres in the Czech Republic. Inspections are carried out on the basis of requirements of: Act No. 18/1997 Coll., Atomic Act, subsequently amended; Act No. 552/1991 Coll., Supervision Act, subsequently amended; Decree No. 307 /2002 Coll., On radiation protection, as amended by Decree No. 499/2005 Coll. 137 mammography X-ray units have been used actively by 108 independent licensees since 1 September 2008. The mammography screening program started in September 2002. The screening program was carried out at 59 working places last year and already at 66 workplaces with accreditation from 1 up to 3 years this year. The activity of the centres is monitored and inspected continuously (not only by SONS). Inspections at 35 workplaces were carried out last year .The doses are significantly below guidance levels at major part of working places. Most of detected defects were eliminated after inspections. The quality of mammographic workplaces in the Czech Republic has been gradually increased and improved. (authors)

  3. The risk of cryptorchidism among sons of women working in horticulture in Denmark

    DEFF Research Database (Denmark)

    Gabel, Pernille; Jensen, Morten Søndergaard; Andersen, Helle Raun

    2011-01-01

    Androgens are crucial for normal testicular descent. Studies show that some pesticides have estrogenic or antiandrogenic effects, and that female workers exposed to pesticides have increased risk of having a boy with cryptorchidism. The main objective of the present study was to investigate wheth...... pregnant women exposed to pesticides due to their work in horticulture experience excess risk of having sons with cryptorchidism....

  4. ANÁLISIS DE LOS ANGULOS LIMITES DE CONDUCCIÓN CONTINUA-DISCONTINUA EN EL REGULADOR CONMUTADO ELEVADOR COMO CFP

    Directory of Open Access Journals (Sweden)

    Hector S Trujillo Alvarado

    2011-03-01

    Full Text Available En este trabajo se analizan las formas de onda del regulador conmutado elevador como CFP trabajando parte deltiempo en operación continua y parte del tiempo en operación discontinua. Se evidencia el hecho de que los ánguloslímites de conducción no son simétricos respecto al máximo de la onda como sugieren trabajos publicados por otrosautores. La simulación con PSPICE confirma este hecho y a partir de los resultados de la simulación se calculanteóricamente las contribuciones a la corriente de directa en la carga que aportan las zonas discontinuas y la zonacontinua de forma aproximada. Se propone una vía para el cálculo analítico de la zona de operación continua.  The wave forms of a boost switching regulator working as a PFC part time in the continouos mode of operationand part time on the discontinouos mode are analysed. The fact that the limit conduction angles are not symmetricalwith respect to the maximum of the current (on the contrary of what stated in papers published by other authorsare evidenced. PSPICE simulations confirmed this assertion. From these results the contributions to the DC outputcurrent of the different operating zones are theoretically estimated. It is proposed a way to calculate analiticallythe contribution to the DC output current of the continuous zone.

  5. DOLOR Y SUFRIMIENTO NO SON SINÓNIMOS PERO SON INTRÍNSECOS A LA NATURALEZA HUMANA:UNA VISIÓN DEL DOLOR Y EL SUFRIMIENTO HUMANO

    Directory of Open Access Journals (Sweden)

    Rubén Darío Camargo

    2012-01-01

    Full Text Available El dolor y el sufrimiento no tienen un referente histórico en el hombre. Solo desde que el hombre es consciente de su humanidad se presenta el dolor y el sufrimiento. El hombre y el dolor siempre han existido, se sufre cuando se nace y se siente dolor, proceso que se repite en cada respiración celular, en cada reacción de oxireducción. Bioló-gicamente en Latín PATIOR = SUFRIR-PADECER es el esfuerzo energético de todo ser vivo para su integración factorial celular.En la medicina el dolor tiene su explicación anatómica y fisiológica, el dolor hace referencia a lo somático y a lo fisiológico. El Dolor agudo es la consecuencia inmediata de la activación del siste-ma nociceptivo, generalmente por un daño tisular somático o visceral, desapareciendo habitualmente con la lesión que lo originó. El Dolor crónico es aquel que persiste en ausencia de la lesión perifé-rica inicial. En la esencia de la filosofía el dolor es impensable e inteligible, se siente, se maneja se tolera pero no se piensa en dolor. Dolor y sufrimiento no son sinónimos pero son intrínsecos a la naturaleza humana. El hombre cuando experimenta el dolor se encuentra con su propio límite, con su propia impotencia de no poder cambiar un hecho real. El sufrimiento humano en la atención diaria del paciente enfermo no lo maneja-mos por ser este algo intangible no monitorizable y mucho menos medible y cuantificable.El dolor del enfermo no es libre ni voluntario, es producto de la fragilidad de su materia, el dolor del que sufre despierta en sus familiares la solidaridad y Tolerancia.

  6. Using BiSON to detect solar internal g-modes

    Directory of Open Access Journals (Sweden)

    Kuszlewicz J.

    2015-01-01

    Full Text Available The unambiguous detection of individual solar internal g modes continues to elude us. With the aid of new additions to calibration procedures, as well as updated methods to combine multi-site time series more effectively, the noise and signal detection threshold levels in the low-frequency domain (where the g modes are expected to be found have been greatly improved. In the BiSON 23-year dataset these levels now rival those of GOLF, and with much greater frequency resolution available, due to the long time series, there is an opportunity to place more constraints on the upper limits of individual g mode amplitudes. Here we detail recent work dedicated to the challenges of observing low-frequency oscillations using a ground-based network, including the role of the window function as well as the effect of calibration on the low frequency domain.

  7. Dombey and Son: An Inverted Maid's Tragedy

    Directory of Open Access Journals (Sweden)

    Taher Badinjki

    2015-06-01

    Full Text Available Ross Dabney, J. Butt & K. Tillotson, and others think that Dickens revised the role of Edith in the original plan of Dombey and Son upon the advice of a friend. I tend to believe that Dickens's swerve from his course was prompted by two motives, his relish for grand scenes, and his endeavour to engage the reader's sympathies for a character who was a victim of a social practice which he was trying to condemn. Dickens's humanitarian attitude sought to redeem the sinner and condemn the sin. In engaging the reader's sympathies,  Dickens  had entrapped his own.  Both Edith and Alice are shown as victims of rapacious mothers who sell anything, or anybody for money. While Good Mrs Brown sells Alice's virtue and innocence for cash, Mrs Skewton trades on Edith's beauty in the marriage market to secure fortune and a good establishment. Edith and Alice's maturity and moral growth and their scorn and anger at their mothers' false teaching come in line with public prudery. Moreover, their educators in the principles of Mammonism have not succeeded altogether in stifling their innate feminine tenderness and capacity for affection, the thing that draws them near their reader's heart and wins them love and sympathy. Keywords: Money,  transaction,  victims,  saleable,  Mormonism,  greedy, rapacious

  8. ¿Quién habla de las mujeres en las noticias donde ellas son las protagonistas?

    Directory of Open Access Journals (Sweden)

    Ana Tamarit

    2011-01-01

    Full Text Available Este artículo presenta un análisis de las fuentes que los periodistas utilizan en las informaciones donde las mujeres son protagonistas de las noticias. La investigación -cuantitativa y cualitativa- se ha realizado en los periódicos de ámbito nacional y local de Castilla y León. Con los resultados obtenidos observamos cómo en los periódicos las noticias que hablan de las mujeres en la mayoría de las ocasiones no se firman. Comprobamos cuáles son las fuentes más utilizadas para la elaboración de esas noticias y las diferentes formas de citar a la fuente cuando se trata de un hombre o de una mujer.

  9. Mothers, fathers, sons, and daughters: gender differences in factors associated with parent-child communication about sexual topics.

    Science.gov (United States)

    Wilson, Ellen K; Koo, Helen P

    2010-12-14

    In the United States, nearly half of high school students are sexually active, and adolescents experience high rates of unintended pregnancy and sexually transmitted diseases. Parents can have an important influence on their children's sexual behaviour, but many parents do not talk with their children about sexual topics. Research has shown significant differences in parent-child communication about sexual topics depending on the gender of both the parent and the child. Little is known, however, about the reasons for these gender differences. The purpose of this paper is to describe how factors associated with parent-child communication about sexual topics differ by gender. Data are from a nationwide online survey with 829 fathers and 1,113 mothers of children aged 10 to 14. For each of the four gender groups (fathers of sons, fathers of daughters, mothers of sons, mothers of daughters), we calculated the distribution of responses to questions assessing (1) parent-child communication about sex-related topics, and (2) factors associated with that communication. We used chi-square tests to determine whether the distributions differed and the false discovery rate control to reduce the likelihood of type I errors. With both sons and daughters, fathers communicated less about sexual topics than mothers did. Fathers also had lower levels of many characteristics that facilitate communication about sex (e.g., lower self-efficacy and lower expectations that talking to their children about sex would have positive outcomes). Compared with parents of sons, parents of daughters (both mothers and fathers) talked more about sexual topics, were more concerned about potential harmful consequences of sexual activity, and were more disapproving of their child having sex at an early age. Using a large national sample, this study confirms findings from previous studies showing gender differences in parent-child communication about sexual topics and identifies gender differences in

  10. Mothers, fathers, sons, and daughters: gender differences in factors associated with parent-child communication about sexual topics

    Directory of Open Access Journals (Sweden)

    Koo Helen P

    2010-12-01

    Full Text Available Abstract Background In the United States, nearly half of high school students are sexually active, and adolescents experience high rates of unintended pregnancy and sexually transmitted diseases. Parents can have an important influence on their children's sexual behaviour, but many parents do not talk with their children about sexual topics. Research has shown significant differences in parent-child communication about sexual topics depending on the gender of both the parent and the child. Little is known, however, about the reasons for these gender differences. The purpose of this paper is to describe how factors associated with parent-child communication about sexual topics differ by gender. Methods Data are from a nationwide online survey with 829 fathers and 1,113 mothers of children aged 10 to 14. For each of the four gender groups (fathers of sons, fathers of daughters, mothers of sons, mothers of daughters, we calculated the distribution of responses to questions assessing (1 parent-child communication about sex-related topics, and (2 factors associated with that communication. We used chi-square tests to determine whether the distributions differed and the false discovery rate control to reduce the likelihood of type I errors. Results With both sons and daughters, fathers communicated less about sexual topics than mothers did. Fathers also had lower levels of many characteristics that facilitate communication about sex (e.g., lower self-efficacy and lower expectations that talking to their children about sex would have positive outcomes. Compared with parents of sons, parents of daughters (both mothers and fathers talked more about sexual topics, were more concerned about potential harmful consequences of sexual activity, and were more disapproving of their child having sex at an early age. Conclusions Using a large national sample, this study confirms findings from previous studies showing gender differences in parent

  11. Sociosexually unrestricted parents have more sons: a further application of the generalized Trivers-Willard hypothesis (gTWH).

    Science.gov (United States)

    Kanazawa, Satoshi; Apari, Péter

    2009-01-01

    The generalized Trivers-Willard hypothesis (gTWH) proposes that parents who possess any heritable trait which increases male reproductive success at a greater rate than female reproductive success in a given environment will have a higher-than-expected offspring sex ratio, and parents who possess any heritable trait which increases the female reproductive success at a greater rate than male reproductive success in a given environment will have a lower-than-expected offspring sex ratio. One heritable trait which increases the reproductive success of sons much more than that of daughters is unrestricted sociosexual orientation. We therefore predict that parents with unrestricted sociosexual orientation (measured by the number of sexual partners, frequency of sex, and attitudes toward relationship commitment and sexual exclusivity) have a higher-than-expected offspring sex ratio (more sons). We analyse the US General Social Surveys and the National Longitudinal Study of Adolescent Health (Add Health), both with large nationally representative samples. Our analyses support the prediction from the gTWH. One standard deviation increase in unrestrictedness of sociosexual orientation increases the odds of having a son by 12-19% in the representative American samples.

  12. Simetría y nuevas soluciones de la ecuación de vibraciones de una viga elástica Symmetry and new solutions of the equation for vibrations of an elastic beam

    Directory of Open Access Journals (Sweden)

    José R. Álvarez

    2009-06-01

    Full Text Available En este artículo se estudia la “no Lie” simetría de la ecuación de viga, se construyen todos los operadores de simetría diferenciales lineales, hasta tercer orden. Se constata que el problema de resolución de dicha ecuación se reduce a la búsqueda de soluciones de dos ecuaciones de Kolmogorov. Se despejan varias clases de soluciones de la ecuación, particularmente las que verifican la ley de conservación de la velocidad areolar inicial y las que verifican la ley de conservación de elasticidad inicial. Se ilustra la equivalencia entre el problema de Cauchy y la existencia de una simetría específica. Se encuentra el paralelismo sorprendente que existe entre la ecuación de viga y la ecuación de onda. Aplicando el “método Ansatz” se construye una amplia familia de nuevas soluciones exactas que incluye particularmente las que describen la propagación de ondas con amortiguamiento. Todos los resultados del artículo son nuevos, los pocos resultados conocidos en la literatura son siempre mencionados.In this short paper it is studied the “not Lie” symmetry of the beam equation. All operators of symmetry linear differential until third order are constructed. It is noted that the resolution of this equation reduces to finding solutions of two Kolmogorov equations. Several class of new solutions of the beam equation are found, particularly those that verify the law of conservation of the initial areolar speed and other that verify the law of conservation of the initial elasticity. It is showed the equivalence between the solution of the problem Cauchy and the existence of a specific symmetry. It is found a parallelism between the beam equation and the wave equation. Using the Ansatz method a wide new family of exact solutions is built. This family includes particularly the solutions which describe the propagation of damped waves. All results of this paper are new.

  13. Complicated grief and manic comorbidity in the aftermath of the loss of a son.

    Science.gov (United States)

    Carmassi, Claudia; Shear, M Katherine; Socci, Chiara; Corsi, Martina; Dell'osso, Liliana; First, Michael B

    2013-09-01

    Based on the recommendations of the sub-workgroup on trauma and dissociative disorders, the American Psychiatric Association (APA) removed the "bereavement exclusion" from the criteria for major depression in DSM-5. In addition, proposed DSM-5 research criteria for persistent complex bereavement disorder (PCBD) were included in the new manual in a section for conditions and criteria needing further research. We describe a case that warranted such a diagnosis. The patient was a 52- year-old woman who was admitted to the inpatient unit of our clinic on the birthday of her son who had died 18 months earlier. She was diagnosed with a manic episode with psychotic symptoms according to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM-IV-TR) criteria and was treated accordingly. Three months after discharge, she made a suicide attempt and was admitted and re-assessed. During this admission, she completed the Inventory of Complicated Grief (ICG), the Mood-Spectrum Rating Scale (MOODS-SR), and the Trauma and Loss Spectrum questionnaire (TALS-SR). She endorsed symptoms of intense yearning for her son, feelings of shock and disbelief, anger and bitterness related to his death, estrangement from others, auditory, tactile and visual hallucinations of the deceased, and intense emotional reactivity to memories of her son. These symptoms were sufficiently prolonged and severe to meet criteria for complicated grief. While complicated grief appeared to be the primary diagnosis for this patient, when she was diagnosed using only DSMIV-TR criteria, her treatment failed to address herprimary problem. This case draws attention to the occurrence of manic-like symptoms as well as depression-like manifestations following bereavement and highlights the importance of including the syndrome of complicated grief in the diagnostic nomenclature.

  14. Effect of Callovo-Oxfordian clay rock on the dissolution rate of the SON68 simulated nuclear waste glass

    Energy Technology Data Exchange (ETDEWEB)

    Neeway, James J., E-mail: James.Neeway@pnnl.gov [SUBATECH, Unité Mixte de Recherche 6457, École des Mines de Nantes, CNRS/IN2P3, Université de Nantes, BP 20722, 44307 Nantes cedex 3 (France); Abdelouas, Abdesselam; Ribet, Solange; El Mendili, Yassine [SUBATECH, Unité Mixte de Recherche 6457, École des Mines de Nantes, CNRS/IN2P3, Université de Nantes, BP 20722, 44307 Nantes cedex 3 (France); Schumacher, Stéphan [ANDRA, Parc de la Croix Blanche, 1/7 rue Jean Monnet, 92298 Châtenay-Malabry (France); Grambow, Bernd [SUBATECH, Unité Mixte de Recherche 6457, École des Mines de Nantes, CNRS/IN2P3, Université de Nantes, BP 20722, 44307 Nantes cedex 3 (France)

    2015-04-15

    Long-term storage of high-level nuclear waste glass in France is expected to occur in an engineered barrier system (EBS) located in a subsurface Callovo-Oxfordian (COx) clay rock formation in the Paris Basin in northeastern France. Understanding the behavior of glass dissolution in the complex system is critical to be able to reliably model the performance of the glass in this complex environment. To simulate this multi-barrier repository scenario in the laboratory, several tests have been performed to measure glass dissolution rates of the simulated high-level nuclear waste glass, SON68, in the presence of COx claystone at 90 °C. Experiments utilized a High-Performance Liquid Chromatography (HPLC) pump to pass simulated Bure site COx pore water through a reaction cell containing SON68 placed between two COx claystone cores for durations up to 200 days. Silicon concentrations at the outlet were similar in all experiments, even the blank experiment with only the COx claystone (∼4 mg/L at 25 °C and ∼15 mg/L at 90 °C). The steady-state pH of the effluent, measured at room temperature, was roughly 7.1 for the blank and 7.3–7.6 for the glass-containing experiments demonstrating the pH buffering capacity of the COx claystone. Dissolution rates for SON68 in the presence of the claystone were elevated compared to those obtained from flow-through experiments conducted with SON68 without claystone in silica-saturated solutions at the same temperature and similar pH values. Additionally, through surface examination of the monoliths, the side of the monolith in direct contact with the claystone was seen to have a corrosion thickness 2.5× greater than the side in contact with the bulk glass powder. Results from one experiment containing {sup 32}Si-doped SON68 also suggest that the movement of Si through the claystone is controlled by a chemically coupled transport with a Si retention factor, K{sub d}, of 900 mL/g.

  15. Simulation and Efficient Measurements of Intensities for Complex Imaging Sequences

    DEFF Research Database (Denmark)

    Jensen, Jørgen Arendt; Rasmussen, Morten Fischer; Stuart, Matthias Bo

    2014-01-01

    on the sequence to simulate both intensity and mechanical index (MI) according to FDA rules. A 3 MHz BK Medical 8820e convex array transducer is used with the SARUS scanner. An Onda HFL-0400 hydrophone and the Onda AIMS III system measures the pressure field for three imaging schemes: a fixed focus, single...

  16. Son preference, number of children, education and occupational choice in rural Nepal

    OpenAIRE

    Hatlebakk, Magnus

    2012-01-01

    A unique family survey was conducted in Nepal to investigate the economic consequences of having a first-born girl. Women get more children, but we find no causal effect of number of children on economic outcomes. But independently of the number of children there is a positive effect on boys' education of having a first born sister, who presumably takes care of household work so the boys can focus on school. This indicates a stronger son-preference in Nepal than what is found in studies from ...

  17. Jean Alesi and his son Giuliano visited CERN

    CERN Multimedia

    Emma Jones

    2010-01-01

    Jean Alesi, former F1 racing driver, and his kids visited CERN on Monday 1st February 2010. The Bulletin and the Video productions team had the opportunity to meet him. The video interview is transcribed for your convenience. What attracted you to CERN, what was it that made you want to come? We talked at home with the children about places to see close to us, like CERN, where they are seeking to reproduce the origins of the world. These things are so far removed from what we ordinarily think and talk about, that they captured our imagination and made us want to come see for ourselves. We know that your son (Giuliano, 9 years) is interested in what is happening at CERN, so we'd like to ask him: how did he find out about it? Giuliano: I am very interested in the technologies used in laboratories, and the exploration of the Universe. Plus, I wanted to see some of the incredible machines. I enjoyed my visit a lot. I found out about CERN from my mother. She showed me a video that I really liked, so I wanted to...

  18. The risk of cryptorchidism among sons of women working in horticulture in Denmark: a cohort study.

    Science.gov (United States)

    Gabel, Pernille; Jensen, Morten Søndergaard; Andersen, Helle Raun; Baelum, Jesper; Thulstrup, Ane Marie; Bonde, Jens Peter; Toft, Gunnar

    2011-11-14

    Androgens are crucial for normal testicular descent. Studies show that some pesticides have estrogenic or antiandrogenic effects, and that female workers exposed to pesticides have increased risk of having a boy with cryptorchidism. The main objective of the present study was to investigate whether pregnant women exposed to pesticides due to their work in horticulture experience excess risk of having sons with cryptorchidism. We conducted a cohort study of pregnant women working in horticulture using four cohorts including one cohort established with data from the departments of occupational medicine in Jutland and Funen and three existing mother-child cohorts (n=1,468). A reference group was established from the entire Danish population of boys born in the period of 1986-2007 (n=783,817). Nationwide Danish health registers provided information on birth outcome, cryptorchidism diagnosis and orchiopexy. The level of occupational exposure to pesticides was assessed by expert judgment blinded towards outcome status. Risk of cryptorchidism among exposed horticulture workers compared to the background population and to unexposed horticulture workers was assessed by Cox regression models. Pesticide exposed women employed in horticulture had a hazard ratio (HR) of having cryptorchid sons of 1.39 (95% CI 0.84; 2.31) and a HR of orchiopexy of 1.34 (0.72; 2.49) compared to the background population. Analysis divided into separate cohorts revealed a significantly increased risk of cryptorchidism in cohort 2: HR 2.58 (1.07;6.20) and increased risk of orchiopexy in cohort 4: HR 2.76 (1.03;7.35), but no significant associations in the other cohorts. Compared to unexposed women working in horticulture, pesticide exposed women had a risk of having sons with cryptorchidism of 1.34 (0.30; 5.96) and of orchiopexy of 1.93 (0.24;15.4). The data are compatible with a slightly increased risk of cryptorchidism in sons of women exposed to pesticides by working in horticulture.

  19. La Mycorhize à arbuscules : quels bénéfices pour l'homme et son ...

    African Journals Online (AJOL)

    La Mycorhize à arbuscules : quels bénéfices pour l'homme et son ... et quantitative de la production végétale mais aussi pour une gestion et une remédiation ... Mycorrhizal symbiosis, and specifically arbuscular mycorrhization, which occurs ...

  20. The Tragedy of Hamlet, Son of an Organic Chemist of Denmark

    Science.gov (United States)

    Brisbois, Ronald G.

    2004-04-01

    Once faced with structure reactivity relationships in the context of nucleophilic substitution at sp 3 carbon, introductory organic chemistry students must compare and contrast the various attributes and ramifications of S N 2 versus S N 1 reaction pathways. The dramatic (even melodramatic) way in which some students ask such comparative questions inspired a parody of Hamlet's famous to be or not to be soliloquy. Herein, Hamlet (the son of an organic chemist of Denmark) is the surrogate of any and every student as he uses a thoroughly Shakespearian approach to sorting out some of the key distinguishing features of S N 2 versus S N 1 reactions.

  1. Parental mental health after the accidental death of a son during military service: 23-year follow-up study.

    Science.gov (United States)

    Kristensen, Pål; Heir, Trond; Herlofsen, Pål H; Langsrud, Øyvind; Weisæth, Lars

    2012-01-01

    We prospectively studied parental mental health after suddenly losing a son in a military training accident. Parents (N = 32) were interviewed at 1, 2 and 23 years after the death of their son. The General Health Questionnaire and Expanded Texas Inventory of Grief were self-reported at 1, 2, 5, and 23 years; the Inventory of Complicated Grief was self-reported at 23 years. We observed a high prevalence of psychiatric disorders at 1- and 2-year follow-ups (57% and 45%, respectively), particularly major depression (43% and 31%, respectively). Only one mental disorder was diagnosed at the 23-year follow-up. Grief and psychological distress were highest at 1- and 2-year follow-ups. Spouses exhibited a high concordance of psychological distress. Mothers reported more intense grief reactions than did fathers. The loss of a son during military service may have a substantial impact on parental mental health particularly during the first 2 years after death. Spouses' grief can be interrelated and may contribute to their psychological distress.

  2. Atmospheric Extinction Coefficients in the Ic Band for Several Major International Observatories: Results from the BiSON Telescopes, 1984-2016

    Science.gov (United States)

    Hale, S. J.; Chaplin, W. J.; Davies, G. R.; Elsworth, Y. P.; Howe, R.; Lund, M. N.; Moxon, E. Z.; Thomas, A.; Pallé, P. L.; Rhodes, E. J., Jr.

    2017-09-01

    Over 30 years of solar data have been acquired by the Birmingham Solar Oscillations Network (BiSON), an international network of telescopes used to study oscillations of the Sun. Five of the six BiSON telescopes are located at major observatories. The observational sites are, in order of increasing longitude: Mount Wilson (Hale) Observatory (MWO), California, USA; Las Campanas Observatory, Chile; Observatorio del Teide, Izaña, Tenerife, Canary Islands; the South African Astronomical Observatory, Sutherland, South Africa; Carnarvon, Western Australia; and the Paul Wild Observatory, Narrabri, New South Wales, Australia. The BiSON data may be used to measure atmospheric extinction coefficients in the {{{I}}}{{c}} band (approximately 700-900 nm), and presented here are the derived atmospheric extinction coefficients from each site over the years 1984-2016.

  3. Avaliação da influência de alterações cardíacas na ultrassonografia vascular periférica de idosos

    Directory of Open Access Journals (Sweden)

    Alcides José Araújo Ribeiro

    Full Text Available Resumo Contexto As cardiopatias podem causar alterações no formato das ondas da ultrassonografia vascular (UV em vasos periféricos. Essas alterações, tipicamente bilaterais e sistêmicas, são pouco conhecidas e estudadas. Objetivo Avaliar as ondas periféricas da UV de pacientes idosos para identificar alterações decorrentes de cardiopatias. Métodos Foram estudados 183 pacientes idosos submetidos a UV periférica no ano de 2014. Resultados Foram avaliados 102 mulheres (55,7% e 81 homens (44,3% com idade entre 60 e 91 anos (média de 70,4±7,2 anos. Encontraram-se alterações pela UV em 84 pacientes (45,9%. Foram identificadas 138 alterações de oito dos 13 tipos descritos na literatura: arritmia, onda bisferiens de pico sistólico, baixa velocidade de pico sistólico, pulsatilidade em veias femorais, bradicardia, taquicardia, onda de pulso parvus tardus e onda de pulso alternans. Houve baixa concordância entre a presença e a não presença de alterações na UV e na avaliação cardiológica. Na análise específica das alterações, os exames tiveram uma concordância variável, que foi boa para o achado de taquicardia, moderada para arritmia e baixa para bradicardia. Não houve concordância entre a UV e os exames cardiológicos para as demais alterações. Conclusões É possível identificar determinadas alterações cardíacas em idosos por meio da análise do formato das ondas periféricas da UV. É importante reconhecer e relatar a presença dessas alterações, pela possibilidade de alertar para um diagnóstico ainda não identificado nesses pacientes. Entretanto, mais estudos são necessários para que seja definida a importância das alterações no formato das ondas Doppler periféricas no reconhecimento de cardiopatias.

  4. Determinación de la carga topológica de un haz bessel-gauss mediante el patrón de difracción a través de una abertura triangular equilátera

    Directory of Open Access Journals (Sweden)

    Cristian Hernando Acevedo

    2015-01-01

    Full Text Available La carga topológica de una onda electromagnética CT, está relacionada con su distribucion espacial en el frente de onda. Ondas electromagnéticas con un factor acimutal exp(il en su fase, tienen CT entera (l=m o no entera (l=M. Estas ondas electromagnéticas con un valor definido de carga topológica pueden ser producidas en el régimen visible utilizando máscaras tenedor holográficas generadas por computador. En este artículo se estudia mediante simulaciones numéricas la red triangular formada en el régimen de intensidad de Fraunhofer de haces Bessel-Gauss con CT entera y no entera que han difractado sobre una rendija en forma triangular para determinar su signo y su magnitud. También se presentan los resultados experimentales de la intensidad en campo lejano obtenidos al difractar una onda luminosa Bessel-Gauss con CT entera y no entera a través de una rendija triangular equilátera. Argumentos cualitativos parciales han sido expuestos para explicar el fenómeno de difracción de estos haces con carga topológica. Aquí se presentan argumentos cualitativos y cuantitativos que permiten explicar todos los resultados de la difracción por una abertura triangular de haces con carga topológica obtenidos ya sea por simulación numérica o mediante su realización experimental.

  5. «¿Quién soy yo? ¿Quiénes son ellos/as?». Personajes en busca de identidad

    Directory of Open Access Journals (Sweden)

    Caretti, Laura

    2006-12-01

    Full Text Available Who am I? Who are they? These are the questions haunting the characters, created by writers such as Ibsen, Pirandello, Beckett and others, whose emblematic search for identity is explored in the article. The complex interconnections between subjectivity and alterity are focused within the coordinates of space (society and time (memory in their outward and inward movement. The characters are seen on stage relating also to the otherness of actors and spectators. Particular relief is given to the difference between the female and male search for identity in the light of contemporary historical changes.¿Quién soy yo? ¿Quiénes son ellos/as? Estas son las cuestiones que obsesionan a los personajes creados por escritores como Ibsen, Pirandello, Beckett y otros, cuya emblemática búsqueda de identidad se explora a lo largo de este artículo. Las complejas interconexiones entre subjetividad y alteridad son analizadas con las coordenadas del espacio (sociedad y el tiempo (memoria en su movimiento interno y externo. Los personajes son vistos en el escenario desde la alteridad de actores y espectadores. Un particular relieve se otorga a la diferencia entre la búsqueda de la identidad femenina y masculina a la luz de los cambios históricos contemporáneos.

  6. Polyandrous females provide sons with more competitive sperm: Support for the sexy-sperm hypothesis in the rattlebox moth (Utetheisa ornatrix).

    Science.gov (United States)

    Egan, Andrea L; Hook, Kristin A; Reeve, H Kern; Iyengar, Vikram K

    2016-01-01

    Given the costs of multiple mating, why has female polyandry evolved? Utetheisa ornatrix moths are well suited for studying multiple mating in females because females are highly polyandrous over their life span, with each male mate transferring a substantial spermatophore with both genetic and nongenetic material. The accumulation of resources might explain the prevalence of polyandry in this species, but another, not mutually exclusive, possibility is that females mate multiply to increase the probability that their sons will inherit more-competitive sperm. This latter "sexy-sperm" hypothesis posits that female multiple mating and male sperm competitiveness coevolve via a Fisherian runaway process. We tested the sexy-sperm hypothesis by using competitive double matings to compare the sperm competition success of sons of polyandrous versus monandrous females. In accordance with sexy-sperm theory, we found that in 511 offspring across 17 families, the male whose polyandrous mother mated once with each of three different males sired significantly more of all total offspring (81%) than did the male whose monandrous mother was mated thrice to a single male. Interestingly, sons of polyandrous mothers had a significantly biased sex ratio of their brood toward sons, also in support of the hypothesis. © 2015 The Author(s). Evolution © 2015 The Society for the Study of Evolution.

  7. Like father, like son: periventricular nodular heterotopia and nonverbal learning disorder.

    Science.gov (United States)

    McCann, Marcia V; Pongonis, Stephen J; Golomb, Meredith R; Edwards-Brown, Mary; Christensen, Celanie K; Sokol, Deborah K

    2008-08-01

    Periventricular nodular heterotopia is a common malformation of cortical development in which the migration of developing neurons destined for the cerebral cortex is abbreviated. Bilateral periventricular nodular heterotopia is most commonly an X-linked disorder that involves mutations in the filamin A (FLNA) gene, but an autosomal recessive form and sporadic forms have been identified. To our knowledge, autosomal dominant transmission of isolated periventricular nodular heterotopia has not been reported. Periventricular nodular heterotopia has a heterogeneous phenotype, associated commonly with seizure disorder, and more recently with reading deficits and visual-spatial deficits in some patients. We present a father and son with bilateral periventricular nodular heterotopia and similar visual-spatial learning deficits, consistent with nonverbal learning disability.

  8. Thermodynamic and structural models compared with the initial dissolution rates of SON glass samples

    International Nuclear Information System (INIS)

    Tovena, I.; Advocat, T.; Ghaleb, D.; Vernaz, E.

    1993-01-01

    The experimentally determined initial dissolution rate R 0 of nuclear glass was correlated with thermodynamic parameters and structural parameters. The initial corrosion rates of six ''R7T7'' glass samples measured at 100 deg C in a Soxhlet device were correlated with the glass free hydration energy and the glass formation enthalpy. These correlations were then tested with a group of 26 SON glasses selected for their wide diversity of compositions. The thermodynamic models provided a satisfactory approximation of the initial dissolution rate determined under Soxhlet conditions for SON glass samples that include up to 15 wt% of boron and some alumina. Conversely, these models are inaccurate if the boron concentration exceeds 15 wt% and the glass contains no alumina. Possible correlations between R 0 and structural parameters, such as the boron coordination number and the number of nonbridging oxygen atoms, were also investigated. The authors show that R 0 varies inversely with the number of 4-coordinate boron atoms; conversely, the results do not substantiate published reports of a correlation between R 0 and the number of nonbridging oxygen atoms. (authors). 13 refs., 2 figs., 4 tabs

  9. Tela global e oceano azul: cinema 3D, o caso Brasil

    Directory of Open Access Journals (Sweden)

    Andre Gatti

    2012-12-01

    Full Text Available A exibição de filmes de longa-metragem em 3D é a nova onda da indústria cinematográfica global. O que está acontecendo no Brasil? Quais problemas da implantação do 3D no país? Tudo ainda é muito recente, mas os resultados desta onda já podem ser percebidos.

  10. Lg and Other Regional Phases in South America

    Science.gov (United States)

    1991-10-23

    de la dispersi6n de ondas superficiales, Tesis de Grado, Universidad de Chile, Santiago, Chile. Herrmann, R. B. (1980). Q estimates...Altiplanoa; Cordillera de la Costa; Pianicie Costera; Cuenca Superior del Amazonias ; Lianuras Chaco-Benianas; Escudo Brasilego y el La cordillera de ...BrasileRo a partir de la duspersi6r de las ondas superficiales, resis de Grado, Universidad de Chile,

  11. Estimativa das propriedades de flexão estática de seis espécies de madeiras amazônicas por meio da técnica não-destrutiva de ondas de tensão Predicting flexural properties of six Amazonian hardwoods using stress wave nondestructive method

    Directory of Open Access Journals (Sweden)

    Cláudio Henrique Soares Del Menezzi

    2010-01-01

    Full Text Available A utilização de técnicas não-destrutivas (NDT pode incrementar o nível de informação tecnológica sobre espécies de madeira conhecidas, bem como daquelas ainda não estudadas. A principal vantagem das técnicas NDT é que são rápidas e várias medidas podem ser feitas, melhorando assim o nível de confiança dos resultados. Nesse contexto, o trabalho objetivou avaliar a viabilidade de utilização da técnica de ondas de tensão na estimativa de propriedades de flexão de seis espécies de madeiras amazônicas. As espécies foram escolhidas com base na sua densidade: Balfourodendron riedelianum, Cedrela fissilis, Cordia goeldiana, Bowdichia virgilioides, Dipteryx odorata and Tabebuia sp. Foram obtidas vinte amostras por espécie nas dimensões segundo ASTM D143-94 para a determinação das propriedades de flexão, totalizando assim 120 amostras. Antes do ensaio destrutivo em flexão estática, as amostras foram avaliadas não-destrutivamente por meio da técnica de ondas de tensão para a determinação do módulo de elasticidade dinâmico e a velocidade de propagação das ondas tensão. De acordo com os resultados, os modelos de regressão foram altamente significativos para a predição das propriedades de flexão do conjunto de espécies. Dessa forma, pode-se concluir que o método é adequado para predizer as propriedades de flexão onde há variação, por exemplo, entre espécies. No entanto, quando a variabilidade é baixa, como dentro da espécie, os modelos apresentaram baixa previsibilidade.The utilization of non-destructive testing (NDT can augment the technological information about well-known wood species, as well as those which have not yet been investigated. The main advantage is that NDT methods are fast, and many measures can be undertaken to improve the confidence level of the evaluation. In this context, the paper aims to study the feasibility of the stress wave method to estimate flexural properties of six

  12. Compte rendu critique du livre Voir son steak comme un animal mort, de Martin Gibert

    Directory of Open Access Journals (Sweden)

    Drolet, Marie-Josée

    2016-10-01

    Full Text Available This critical review provides, first, a step-by-step synthesis of the arguments presented in each chapter of Martin Gibert’s bookVoir son steak comme un animal mort (Seeing your steak as a dead animal. Second, a critical perspective of the book and a personal reflection are presented.

  13. ¿Son Fiables las Estimaciones de Pobreza en América Latina?

    OpenAIRE

    Sanjay G. Reddy

    2008-01-01

    ¿Cuál es el nivel de pobreza de ingresos en América Latina? ¿Ha estado disminuyendo? ¿Son fiables las estimaciones actuales? El enfoque más influyente para medir la pobreza de ingresos a nivel regional y mundial es él utilizado por el Banco Mundial, que establece líneas internacionales de pobreza de ?un dólar al día? y ?dos dólares al día? por persona. El banco utiliza factores de ?paridad del poder adquisitivo? (PPA) para transformar estas líneas internacionales en monedas locales. (...)...

  14. 77 FR 72906 - Chessie Logistics Co., LLC-Acquisition and Operation Exemption-J. Emil Anderson & Son, Inc.

    Science.gov (United States)

    2012-12-06

    ... DEPARTMENT OF TRANSPORTATION Surface Transportation Board [Docket No. FD 35700] Chessie Logistics Co., LLC--Acquisition and Operation Exemption-- J. Emil Anderson & Son, Inc. Chessie Logistics Co... served on Ariel A. Erbacher, Legal Counsel, Chessie Logistics Co., LLC, 1001 Green Bay Rd., Unit 204...

  15. Mothers’ Academic Gender Stereotypes and Education-Related Beliefs About Sons and Daughters in African American Families

    Science.gov (United States)

    Wood, Dana; Kurtz-Costes, Beth; Okeke-Adeyanju, Ndidi; Rowley, Stephanie J.

    2010-01-01

    The role of African American mothers’ academic gender stereotype endorsement in shaping achievement-related expectations for and perceptions of their own children was examined. Mothers (N = 334) of 7th and 8th graders completed measures of expectations for their children’s future educational attainment, perceptions of their children’s academic competence, and academic gender stereotypes. Consistent with hypotheses, mothers held less favorable expectations for sons and perceived sons to be less academically competent than daughters. In addition, mothers reported stereotypes favoring girls over boys in academic domains; stereotype endorsement, in turn, was related to mothers’ educational expectations for and beliefs about the academic competence of their own children, even with youths’ actual achievement controlled. Negative stereotypes about the academic abilities of African American boys may create a negative feedback loop, thereby contributing to the maintenance of the gender gap in African Americans’ educational outcomes. PMID:20648228

  16. Diseño e implementación de un sistema de control en tiempo real mediante ondas cerebrales

    OpenAIRE

    Vimos Tixi, Víctor Hugo; Yánez Flores, Christian Marcelo

    2016-01-01

    Este proyecto desarrolla el procedimiento para adquirir señales cerebrales relacionadas a la intensión de movimiento de los brazos y estado de relajación con ojos cerrados además de los potenciales desarrollados por el movimiento ocular, las señales obtenidas son procesadas y clasificadas respectivamente. El resultado de la clasificación es utilizado como base para la decisión y la ejecución del movimiento básico de un brazo robótico de cinco grados de libertad, se diseña y construye un softw...

  17. Poesía y filosofía son de palabra

    Directory of Open Access Journals (Sweden)

    Santamaría Pargada, Antonio

    2006-04-01

    Full Text Available The imaginary and sinister concentration-camp chief Otto Friedrich Zur Linde was conceived by Jorge-Luis Borges as an example of misunderstanding philosophy and life, by seeing in them only the power of fight. This conception is compared with a dynamic understanding of philosophy. For Mr. Zur Linde Aristotle and Plato represent this confrontation, and each philosophical debate in history could be considered as a moment in it. But now, in the last fight, the will to power of man has gone beyond all the limits, even of morality. However some modern techniques of appropriation of ancient philosophy are completely opposed to this conception, namely Paul Ricoeur’s theory of fiction and Heidegger’s Sein und Schein,. Ultimately, the close relationship between poetry and philosophy since its origins speak against this thesis. A closer analysis of Nietzsche and Hölderlin will help to enlighten how wrong Zur Linde´s conception is..El siniestro jefe de un campo de concentración Otto Friedrich Zur Linde, concebido por Borges como ejemplo de una interpretación de la filosofía y la vida en la que la lucha es el único motor, es confrontado con una concepción de la filosofía dinámica. Zur Linde mantiene que Aristóteles y Platón son el enfrentamiento filosófico paradigmático. En el último momento del enfrentamiento la voluntad de poder de un nuevo superhombre ha rebasado todos los límites, incluso el de la conciencia. A esto se oponen las técnicas de apropiación filosófica del mundo griego por parte de la modernidad, a saber: el poder de la ficción, el Schein y el Sein así como el nacimiento de la filosofía, tan cercano a la poesía. Bajo este prisma cabe un análisis de Nietzsche y Hölderlin, que reniega de la interpretación de Zur Linde y clarifica que ante todo poetas y filósofos son seres de palabra.

  18. Polarización lineal en estrellas simbióticas

    Science.gov (United States)

    Brandi, E.; García, L. G.; Ferrer, O. E.

    Se presenta un estudio de polarización lineal en las bandas UBVRI de un grupo de estrellas simbióticas, a fin de analizar el comportamiento del grado de polarización y del ángulo de posición en función de la longitud de onda. En aquellos sistemas observados repetidas veces, se analizan además variaciones temporales en los parámetros de polarización. En base a este comportamiento se determina si la polarización observada es puramente interestelar o si existe una contribución de polarización, intrínseca al objeto. La muestra de objetos estudiados presenta ciertas características comunes, es decir, son sistemas simbióticos tipo D, cuyas respectivas componentes gigantes son variables tipo Mira y además presentan nebulosas ionizadas extendidas con morfología y dimensiones conocidas. Esto es de importancia ya que el conocimiento de la estructura del gas extendido permite interpretar la geometría de scattering que produce la polarización observada. Las observaciones fueron realizadas con el Fotopolarímetro de Torino adosado al telescopio de 2.15 m del CASLEO.

  19. MODOS GUIADOS EM SLABS METAMATERIAIS GUIDED MODES IN METAMATERIAL SLABS

    Directory of Open Access Journals (Sweden)

    Leonardo André Ambrosio

    2006-12-01

    Full Text Available Este trabalho apresenta um estudo de revisão de modos propagantes em um guia-de-onda slab constituído de materiais com índices de refração negativo, os chamados metamateriais, Mostra-se que os modos guiados em um slab metamaterial possuem algumas propriedades particulares, tais como a propagação de ondas lentas simétricas ou anti-simétricas, a ausência de modos fundamentais para ondas rápidas e a possibilidade de propagação de ondas guiadas em um meio menos denso. A análise é baseada em expansões de campo no guia e nos espaços superior e inferior ao mesmo.This paper presents a review of the propagation modes in a slab waveguide consisting of negative refraction index materials, known as metamaterials. Some particular properties of guided modes in a metamaterial slab, such as slow symmetric or antisymmetric slow wave propagation, the absence of fundamental modes for fast waves and the possibility of guided waves in a less dense medium. The analysis is based on field expansions in the guide and the upper and lower spaces of it.

  20. The prodigal son: some psychological aspects of Augustine's conversion to Christianity.

    Science.gov (United States)

    Nauta, Rein

    2008-03-01

    Augustine's conversion is considered exemplary for its Christian testimony. However, the psychological aspects are also relevant, for Augustine's conversion to Christianity was as much inspired by personal and cultural ambitions as by religious convictions. For Augustine, the conversion to the Christian faith spelled a life of asceticism--a life of celibacy, a virtuous and chaste existence, which also offered him a means of escape from the threatening ambiguity of parental relations and a chance to realize the cultural ideal of the civilized philosopher who has subjugated the passions of the flesh. In this paper we explore the psychological dynamics of the absent father, the suffering mother and the prodigal son and the role they played in Augustine's conversion to Christianity.

  1. Latino Parents' Awareness and Receipt of the HPV Vaccine for Sons and Daughters in a State with Low Three-Dose Completion.

    Science.gov (United States)

    Kepka, Deanna; Ding, Qian; Bodson, Julia; Warner, Echo L; Mooney, Kathi

    2015-12-01

    Latinos suffer a disproportionate burden of human papillomavirus (HPV)-preventable cancers, yet uptake and completion of the HPV vaccine among Latinos is below recommendations. Reasons for low HPV vaccine uptake among Latinos in Utah are unknown. We surveyed Latino parents of HPV vaccine age-eligible adolescents (N=118). Univariable analyses identified sociodemographic characteristics associated with HPV vaccine awareness, interest, and uptake for daughter(s) and/or son(s) using chi-square tests or Fisher's exact tests. More parents who had lived in the USA for 15 years or more had vaccinated their daughter (43.6 vs. 32.5%, p=0.035) compared to those living in the USA for shorter time periods. Parents born in Mexico reported their son had not received the HPV vaccine (74.6 vs. 58.3%, p=0.049) more than those born elsewhere. Parents with Mexican birthplace and ancestry reported not knowing about the HPV vaccine as the main barrier to vaccinating daughters (47.1 vs. 5.9%, p=0.002 for both) and sons (birthplace 38.3 vs. 10.3%, p=0.007; ancestry 37.1 vs. 11.1%, p=0.013) compared to those born or descending elsewhere. Non-acculturated parents with a son were more likely to report not knowing about the HPV vaccine as the main barrier to vaccine receipt (47.6 vs. 12.5%, pLatinos in an understudied region and complement prior research in other regions. This study may have implications for designing culturally tailored interventions to improve uptake of the HPV vaccine among the growing population of Latinos in Utah, and other states in the Intermountain West.

  2. ¿Son las mujeres una minoría?

    Directory of Open Access Journals (Sweden)

    Osborne, Raquel

    1996-10-01

    Full Text Available Not available.

    El clásico tratamiento de las mujeres como minoría desde la sociología se halla contemporáneamente interrelacionado con las políticas de igualdad tejidas en torno a las mujeres. Pasado y presente, teoría y práctica se unen para mostrar que las teorías no son accidentales ni fortuitas sino que acarrean importantes consecuencias en la acción, pudiendo dar lugar a intervenciones en la vida pública, que es lo que, a mi entender, confiere su sentido a la. sociología y, en particular, a la sociología del género. El título alude a la existencia de un importante desarrollo en sociología de la temática de las minorías, que traemos a colación por cuanto desde muy temprano dicha ciencia refirió este tema a las mujeres, desarrollo que seguiremos en este artículo. La conceptualización de las mujeres como minoría se traducirá, en términos de políticas públicas, en lo que se conoce como medidas de acción o discriminación positiva impulsadas, en lo que a las mujeres atañe, por el movimiento feminista.

  3. ABRAM ET LA MAISON DE SON PÈRE (GN 11,26-32)

    OpenAIRE

    Misenga Dituanya, Marie-Anne; Abram et la maison de son père (Gn 11,26-32)

    2015-01-01

    L’élection et l’alliance sont des concepts fondamentaux dans l’Ancien Testament. Cette initiative divine commence avec Abraham par qui Dieu promet de bénir tous les clans de la terre (Gn 12,1-4; 15; 17). Cependant, on néglige souvent le point de départ d’Abraham qui n’est pas l’appel de Dieu, mais la situation de la famille de son père que Dieu demande à Abraham de quitter (Gn 11,26-32). Il est donc important d’étudier cette partie de plus près pour voir s’il est possible de préciser ce qu’es...

  4. Poynting's theorem for complex fields; El teorema de Poynting para campos complejos

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Guasti, M. [Universidad Autonoma Metropolitana-Unidad Iztapalapa, Mexico, D.F (Mexico)

    2001-04-01

    Poynting's theorem is derived for complex electromagnetic fields without invoking the harmonic dependence of the fields. This reformulation yields the functional form of a continuity equation. The definition of poynting's vector for complex fields reduces to its traditional definition for real fields without involving an extra factor of 1/2. [Spanish] Se presenta la derivacion del teorema de Poynting utilizando una representacion compleja de los campos electromagneticos. En esta reformulacion se obtiene cabalmente la forma funcional de una ecuacion de continuidad. Este resultado no requiere que los campos armonicos sean trenes de onda infinitos, de manera que con este formalismo es posible abordar el caso de pulsos electromagneticos. La definicion del vector Poynting para campos complejos se reduce a la definicion convencional si los campos son reales sin involucrar un factor de 1/2 adicional.

  5. A case study of conflict management in bonobos: how does a bonobo (Pan paniscus) mother manage conflicts between her sons and her female coalition partner?

    Science.gov (United States)

    Legrain, L; Stevens, J; Alegria Iscoa, J; Destrebecqz, A

    2011-01-01

    Female coalitions are an important part of the social organization of bonobos. The strength of the mother-son relationship is another essential part of this social structure. A bonobo mother is therefore facing a dilemma when a conflict arises between her sons and her female coalition partners. Will she take her coalition partner's side and favour the social organization of the group or support her son in order to defend her offspring? In order to address this issue, we performed an observational study of the captive group at Planckendael (Belgium) and used social grooming and proximity to assess the relationship between individuals. As a case study, we focused on the relationships between Hortense, one of the group's mothers, her 3 sons Redi, Vifijo and Zamba, and her coalition partner Hermien. Surprisingly, we observed that Hortense preferentially supported her female coalition partner. For Hortense's social status in the group, it may be more important to maintain the strong relationship with her higher-ranking female coalition partner than to support her sons. Copyright © 2012 S. Karger AG, Basel.

  6. Poetics of Narrative: A Study on the "Sons of the Wind" by Laila Al Atrash

    Science.gov (United States)

    Al Zuraigat, Asma M.; Zeidanin, Hussein Hasan

    2015-01-01

    This study aims at identifying the poetic devices overlapping with the genre of fiction in Laila Al Atrash's novel "The Sons of the Wind". The devices the study explores are the poetics of the title, poetics of the prologue and poetics of the language upon which the writer relies to support her point of view about the topics and issues…

  7. ¿Qué son los modelos físicos?

    Directory of Open Access Journals (Sweden)

    José Luis Rolleri

    2013-01-01

    Full Text Available En este artículo analizamos los principales conceptos propuestos de modelo con el propósito de resaltar el carácter idealizado y abstracto de los modelos físicos, que generalmente es pasado por alto en la literatura filosófica relevante desde diversas posiciones, como el instrumentalismo y el pragmatismo; el cual, sin embargo tiene importantes implicaciones en problemas filosóficos como el del realismo científico. Desde una posición conceptualista, sostenemos que los modelos desidealizados son los vehículos para conceptualizar los sistemas físicos desde la perspectiva de una teoría. In this paper we analyze the main intended concepts of model in order to underline the idealized and abstract character of physical models, that generally is overpass in the relevant philosophical literature from diverse positions on the scientific knowledge, such as instrumentalism and pragmatism, which however has important implications on philosophical problems such as that of scientific realism. From a conceptualistic position we hold that the de-idealized models are the vehicles to conceptualized physical systems from the perspective of a theory

  8. Superselection sectors of SO(N) Wess-Zumino-Witten models

    International Nuclear Information System (INIS)

    Boeckenhauer, J.

    1996-06-01

    The superselection structure of so(N) WZW models is investigated form the point of view of algebraic quantum field theory. At level 1 it turns out that the observable algebras of the WZW theory can be constructed in terms of even CAR algebras. This fact allows to give a formulation of these models close to the DHR framework. Localized endomorphisms are constructed explicitly in terms of Bogoliubov transformations, and the WZW fusion rules are proven using the DHR sector product. At level 2 it is shown that most of the sectors are realized in H NS =H NS x H NS where H NS is the Neveu-Schwarz sector of the level 1 theory. The level 2 charcters are derived and H NS is decomposed completely into tensor products of the sectors of the WZW chiral algebra and irreducible representation spaces of the coset Virasoro algebra. Crucial for this analysis is the DHR decomposition of H NS into sectors of a gauge invariant fermion algebra since the WZW chiral algebra as well as the coset Virasoro algebra are invariant under the gauge group O(2). (orig.)

  9. Effects of maximum dynamic exercise on electrocardiograms Efectos del ejercicio dinámico máximo sobre electrocardiograma

    Directory of Open Access Journals (Sweden)

    J. Ponce

    2010-09-01

    Full Text Available

     

    The effects of maximal dynamic exercise (sprint has been studied on the ECG of 100 greyhound who run in programmed 350 m races. Two ECG were taken in each animal: one before the race and the other after the effort. After the race there is a significant increase of the voltage in the waves P, R and T in DII, DIII and aVF, and the T waves are symetrical in 96% of the subjets. The highest voltage and duration of the P wawes represent the efficacy of the atrial function on the maintenance of the cardiac output. The increase of the amplitude of the R and T waves would be a consequence of the systolic volumen increase and the establishment of transitory myocardial ischemia. The average heart rate increases in 21.740"30.109 b.p.m., beeing the difference significant. When we analyse the ECG after exercise with the resting ECG in relation with age, weight, sex, category and rank we deduce that the differences arent related with those groups, except to the heart rate and age, observing that the capacity in increasing it decreases with age.
    KEY WORDS: Oxygen deficit, anaerobic capacity, performance, validity, fitness.

    Se han estudiado los efectos del ejercicio dinámico máximo (sprint sobre el ECG en 100 galgos greyhound que participaban en carreras programadas de 350 m. Se realizaron dos ECG en cada animal: uno antes de la carrera y otro postesfuerzo. Después de la carrera hay un aumento significativo del voltaje de las ondas P, R y T en DII, DIII y aVF, y las ondas T son simétricas en el 96% de los sujetos. El mayor voltaje y duración de las ondas P representan la eficacia de la función auricular para el mantenimiento del volumen minuto. El incremento de la amplitud de las ondas R y T sería consecuencia del aumento del volumen sistólico y de la instauración de isquemia miocárdica relativa transitoria. La

  10. La Selva Viajera: Rutas del chamanismo ayahuasquero entre Europa y América

    Directory of Open Access Journals (Sweden)

    Anne-Marie Losonczy

    2010-01-01

    Full Text Available Este texto explora una dimensión particular des las prácticas religiosas en migración. El fenómeno chamánico constituye actualmente un paisaje multipolar, atravesado por desplazamientos regulares de expertos en rituales y de practicantes, a la vez que por la mobilidad y la constante reconfiguración de las prácticas rituales. Estas itinerancias y estancias transcontinentales marcan a las comunidades locales, llevándolas hacia una reformulación de sus propios rituales de uso interno o regional. El chamanismo en su versión transcontinental se estructura según un continuum organizacional en diversas escalas que abre, enmarca, y reproduce los itinerarios que relacionan a los territorios del chamanismo habitualmente llamado "étnico" con las recomposiciones urbanas tanto a nivel nacional como internacional. Este continuum se sitúa efectivamente en el cruce de los "chamanismos urbanos" nacionales e internacionales que se construyen alrededor de la doble figura del "indígena" y de la "selva", en cuanto recursos simbólicos revalorizados. Por ende, este texto se propone analizar el papel central de la capacidad chamánica, reclasificada como "saber", para la reformulación el replanteamiento de las jerarquías simbólicas de validez nacional e internacional, instituidas durante la colonización.

  11. The presence of harmonics in electric installations and some of its consequences; La presencia de corrientes armonicas en instalaciones electricas y algunas de sus consecuencias

    Energy Technology Data Exchange (ETDEWEB)

    Bratu Serban, Neagu; Campero Littlewood, Eduardo [Universidad Autonoma Metropolitana Azcapotzalco, Mexico, D. F. (Mexico)

    1996-12-31

    This paper is a short introduction to how the sinusoidal voltage waves are generated. A revision is made on the way of representing a distorted wave and the way of quantifying its harmonics content (harmonics distortion). An overview is made of the non-lineal consuming elements that produce distortion of the current waves. A revision is made on the concept of a power factor in conditions of waves with harmonic distortion. The consequences of feeding with distorted waves the different devices such as motors (particularly for the distortion originated by the rectifiers and the velocity electronic controls), transformers and capacitors. Mention is made of some of the methods for not to produce or for reducing the harmonic effect in the electric networks. The purpose of this article is to review the consequences on energy consumption by the presence of harmonics. [Espanol] En este articulo se hace una breve introduccion de la forma en que se generan las ondas senoidales de voltaje. Se revisa la manera de representar una onda distorsionada y la manera de cuantificar su contenido de armonicas (distorsion armonica). Se repasan los elementos consumidores no lineales que producen la deformacion de las ondas de corriente. Se revisa el concepto de factor de potencia en condiciones de ondas con distorsion armonica. Se analizan las consecuencias de alimentar con ondas distorsionadas a diferentes equipos como motores (particularmente por la distorsion originada por los rectificadores y los controladores de velocidad electronicos), transformadores y capacitores. Se mencionan algunos metodos para no producir, o reducir el efecto armonico en las redes electricas. El proposito de este articulo es revisar las consecuencias sobre el consumo de energia por la presencia de armonicas.

  12. The presence of harmonics in electric installations and some of its consequences; La presencia de corrientes armonicas en instalaciones electricas y algunas de sus consecuencias

    Energy Technology Data Exchange (ETDEWEB)

    Bratu Serban, Neagu; Campero Littlewood, Eduardo [Universidad Autonoma Metropolitana Azcapotzalco, Mexico, D. F. (Mexico)

    1997-12-31

    This paper is a short introduction to how the sinusoidal voltage waves are generated. A revision is made on the way of representing a distorted wave and the way of quantifying its harmonics content (harmonics distortion). An overview is made of the non-lineal consuming elements that produce distortion of the current waves. A revision is made on the concept of a power factor in conditions of waves with harmonic distortion. The consequences of feeding with distorted waves the different devices such as motors (particularly for the distortion originated by the rectifiers and the velocity electronic controls), transformers and capacitors. Mention is made of some of the methods for not to produce or for reducing the harmonic effect in the electric networks. The purpose of this article is to review the consequences on energy consumption by the presence of harmonics. [Espanol] En este articulo se hace una breve introduccion de la forma en que se generan las ondas senoidales de voltaje. Se revisa la manera de representar una onda distorsionada y la manera de cuantificar su contenido de armonicas (distorsion armonica). Se repasan los elementos consumidores no lineales que producen la deformacion de las ondas de corriente. Se revisa el concepto de factor de potencia en condiciones de ondas con distorsion armonica. Se analizan las consecuencias de alimentar con ondas distorsionadas a diferentes equipos como motores (particularmente por la distorsion originada por los rectificadores y los controladores de velocidad electronicos), transformadores y capacitores. Se mencionan algunos metodos para no producir, o reducir el efecto armonico en las redes electricas. El proposito de este articulo es revisar las consecuencias sobre el consumo de energia por la presencia de armonicas.

  13. Like father, Like Son? Collective decisions taking into account family relations

    Directory of Open Access Journals (Sweden)

    Ariádne Scalfoni Rigo

    2018-01-01

    Full Text Available This teaching case aims to promote reflection on other possible economic actions and alternative management models based on proximity relations. It presents a real situation in a community in the interior of Bahia, experienced by a Community Development Bank, which is an innovative experience on solidarity financing in Brazil and worldwide, related to a credit request by a certain Mr. Francisco. In order to protect his son, Pedro, Francisco created a dilemma that Ms. Marta, the credit agent of the Community Development Bank, sought to solve within the Credit Analysis Committee, a collective decision-making structure based on neighborhood relations.  The decision was not easy and involved many variables. This case allows to discuss the influence of community relations on solidarity finances, in collective management structures, and in the dynamics of Community Development Banks.

  14. Parents' experience of living with and caring for an adult son or daughter with schizophrenia at home in Ireland: a qualitative study.

    Science.gov (United States)

    McAuliffe, R; O'Connor, L; Meagher, D

    2014-03-01

    This study explored the experience of parents living with, and caring for, an adult son or daughter with schizophrenia. There is increasing emphasis on the involvement of carers and users in the care for people with schizophrenia. 'A Vision for Change' highlights the need for a partnership approach and emphasizes that carers are an integral part in the planning and delivery of mental health services. In order to meet such requests, it was necessary to explore the meaning of caregiving for Irish families. A descriptive qualitative design was used to enable parents to describe their experiences. Semi-structured, in-depth interviews with a convenience sample of six parents in Ireland were carried out in 2007. The study encompassed four major themes: psychological tsunami, caring activities, coping with enduring illness and an uncertain pathway. Parents reported severe psychological distress when their son or daughter was diagnosed with schizophrenia. Their deep sense of loss was followed by acceptance of the situation. Feelings of love and a sense of responsibility helped to give meaning to their caring role. This study gave a voice to some parents of a son or daughter with schizophrenia. A family-centred approach should be at the core of care planning for this vulnerable population. © 2013 John Wiley & Sons Ltd.

  15. Mitochondrial DNA analysis on remains of a putative son of Louis XVI, King of France and Marie-Antoinette.

    Science.gov (United States)

    Jehaes, E; Decorte, R; Peneau, A; Petrie, J H; Boiry, P A; Gilissen, A; Moisan, J P; Van den Berghe, H; Pascal, O; Cassiman, J J

    1998-01-01

    Carl Wilhelm Naundorff was buried in 1845 in Delft as Louis Charles, Duc de Normandie, 'Louis XVII'. However, the son of Louis XVI and Marie-Antoinette-Louis XVII--officially died in the Temple of Paris in 1795. In order to resolve the identity of Naundorff, mitochondrial DNA (mtDNA) D-loop sequences of his remains were compared with the sequences obtained from the hairs of two sisters of Marie-Antoinette, Marie-Antoinette herself, and with the sequences obtained from DNA samples of two living maternal relatives. The mtDNA sequence of a bone sample from Naundorff showed two nucleotide differences from the sequences of the three sisters and four differences from the sequences of living maternal relatives. Based on this evidence it becomes very unlikely that Naundroff is the son of Marie-Antoinette.

  16. Acceptability of the human papillomavirus vaccine and reasons for non-vaccination among parents of adolescent sons.

    Science.gov (United States)

    Donahue, Kelly L; Stupiansky, Nathan W; Alexander, Andreia B; Zimet, Gregory D

    2014-06-30

    Routine administration of the quadrivalent human papillomavirus (HPV) vaccine has been recommended for 11-12-year-old males since 2011, but coverage remains low. In a U.S. national sample of parents of 11-17-year-old males (n=779), 78.6% of parents reported their sons had not received the HPV vaccine. The most common reason for non-vaccination (56.7%) was "My doctor or healthcare provider has not recommended it." Parents citing only logistical reasons for non-vaccination (e.g., lack of recommendation, access, or education, n=384) reported significantly higher vaccine acceptability than parents reporting a combination of attitudinal (e.g., concerns about vaccine safety or efficacy) and logistical barriers (n=92), while parents citing only attitudinal barriers (n=73) reported the lowest level of vaccine acceptability. In sum, many parents are willing but have not vaccinated sons due to logistical barriers, most commonly lack of healthcare provider recommendation. These findings have important implications for increasing HPV vaccination coverage among adolescent males. Copyright © 2014 Elsevier Ltd. All rights reserved.

  17. LA SABIDURIA DEL SILENCIO. HACIA EL DIÁLOGO... ¡OTROS MUNDOS SON POSIBLES!

    Directory of Open Access Journals (Sweden)

    Juan Carlos Valverde Campos

    2012-05-01

    Full Text Available A Occidentales y Orientales nos cobija un mismo techo. Sin embargo, la manera de concebir el mundo y, por ende, de actuar, es diferente. La sociedad globalizada en la que vivimos quiere hacer de este mundo uno solo, con un solo corazón y una sola manera de actuar y pensar. Occidente ha impuesto su mundo cuando en realidad son muchos y debemos conocerlos. El pensamiento oriental tiene mucho qué decirnos a los occidentales. En todo caso, el silencio que impone la escucha es fundamental en eso que tantos llaman hoy el diálogo.

  18. Brainstem auditory evoked responses in healthy Argentine Mastiff dogs recorded with surface electrodes

    Directory of Open Access Journals (Sweden)

    M. Armașu

    2015-10-01

    Full Text Available RESUMOEvocado auditivo de respostas – BAER foi gravado utilizando eletrodos de superfície em sete cães Mastiff argentino saudáveis para estimulações monoaural e binaural em intensidades sonoras de 90 dB NPS . As latências e amplitudes das ondas I, III e V bem como os intervalos InterWave I- III , III -V e IV foram calculados. As diferenças estatísticas foram obtidas para as ondas III e latências V, amplitudes das ondas III e intervalos I- III e I-V entre mono e estimulação binaural. Por serem uma das raças geneticamente predispostas à surdez congênita, obtendo valores de referência BAER, os cães Mastiff argentino têm uma importância clínica especial.

  19. Meaning Reconstruction Process After Suicide: Life-Story of a Japanese Woman Who Lost Her Son to Suicide.

    Science.gov (United States)

    Kawashima, Daisuke; Kawano, Kenji

    2017-09-01

    Although Japan has a high suicide rate, there is insufficient research on the experiences of suicide-bereaved individuals. We investigated the qualitative aspects of the meaning reconstruction process after a loss to suicide. We conducted a life-story interview using open-ended questions with one middle-aged Japanese woman who lost her son to suicide. We used a narrative approach to transcribe and code the participant's narratives for analysis. The analysis revealed three meaning groups that structured the participant's reactions to the suicide: making sense of her son's death and life, relationships with other people, and reconstruction of a bond with the deceased. The belief that death is not an eternal split and that there is a connection between the living and the deceased reduced the pain felt by our participant. Furthermore, the narratives worked as scaffolds in the meaning reconstruction process. We discuss our results in the light of cross-cultural differences in the grieving process.

  20. PULSOS EROSIVOS E RESPOSTA MORFODINÂMICA ASSOCIADA A EVENTOS EXTREMOS NA COSTA LESTE DO ESTADO DO RIO DE JANEIRO

    Directory of Open Access Journals (Sweden)

    Dieter Carl Ernst Heino Muehe

    2015-09-01

    Full Text Available O litoral do Rio de Janeiro foi atingido, nos últimos 15 anos, por duas tempestades excepcionais. A primeira em Maio de 2001 e a segunda em Abril de 2010. A primeira provocou erosão pronunciada na orla costeira voltada para o sul, isto é entre o Cabo Frio e a Marambaia, enquanto a segunda teve esse efeito no litoral leste do estado a norte do Cabo Frio devido à direção de incidência das ondas que em vez de sul sul-sudeste, mais comum, vieram de sudeste. No presente trabalho é apresentada uma análise do comportamento morfodinâmico da orla costeira a norte dos cabos Frio e Búzios, mais especificamente das praias do Peró, Tucuns, Barra de São João e Rio das Ostras (Abricó, antes e após a tempestade de abril de 2010 abrangendo períodos de até 17 anos em Barra de São João (1996 a 2013 a um mínimo de 7 anos (2007 a 2014 na praia do Peró. O clima de ondas de sudeste, para os últimos 30 anos (1981 a 2011, foi obtido por meio de reanálise dos ventos com filtragem posterior para ondas com altura superior a 3 m e 3,5 m consideradas, neste trabalho, como representativas de ressacas excepcionais. Os resultados mostram que esses eventos extremos correspondem efetivamente aos eventos erosivos encontrados, cuja ocorrência se dá numa frequência muito baixa, permitindo a recuperação do estoque de sedimentos da praia e da base das dunas frontais, com exceção da Praia do Abricó em Rio das Ostras, que apresenta uma tendência histórica de déficit no balanço sedimentar. Para o período do clima de ondas analisado não foi identificada uma tendência de aumento da recorrência, principalmente para ondas de altura superior a 3,5 m. A menor frequência de ocorrência de eventos extremos, quando comparado com outros segmentos, mais expostos, do litoral do Rio de Janeiro, se deve à proteção às ondas de sul e sul-sudoeste exercido pela orientação da linha de costa e da sombra exercida pelo Cabo Frio e Cabo Búzios. Isto resulta num

  1. Cinematic narratives of Sonderkommando: Son of saul or narrating the victim, perpetrator, trauma and death

    Directory of Open Access Journals (Sweden)

    Daković Nevena

    2016-01-01

    Full Text Available The aim of this paper is to map out - by analysing the film Son of Saul, but also by its comparison with two other films dealing with the topic, Himmelkommando and The Grey Zone, the narrative mechanism that satisfies the complex ethical and aesthetical demands imposed by the theme of Sonderkommando as the particular episode of the Holocaust. The key element of the narrative structure is the construction of the Levi’s “dead and drowned” witness who “resurrected” through the narrative intervention becomes the only reliable and credible narrator of the historical trauma. The prerequisite for his emergence is the narration and representation of the death which makes but also solves the traumatised - understood as multiple, fragmented, opposed - identities of the members of the special squad. Their entangled identity involves the simultaneous presence of a victim, perpetrator, witness and the authentic narrator of the trauma of the death camp. The death of the perpetrator is the condition sina qua non for the emergence of the figure of the victim-witness narrator but also for making of narrative which overcomes the initial trauma of the Holocaust. The detailed analysis of the film Son of Saul confirms and identifies these narratives as the modernist narration of the post-traumatic film.

  2. CUENTOS QUE NO SON CUENTOS...UN RECORRIDO POR SAN ZENÓN (MAGDALENA

    Directory of Open Access Journals (Sweden)

    Tania Ximena Salcedo Goméz

    2013-07-01

    Full Text Available Es de tarde y el sol inclemente de febrero se refleja sobre Las cálidas aguas del río Magdalena; sus visos en naranja y rojo se inmortalizan en el tapiz del cielo, mientras en tierra, esta gama de luz iridescente se forja en la piel de los hombres y mujeres de San Zenón. Los árboles desnudos han sido bañados por el frío invierno. Las ciénagas y el río han dejado sus marcas a través del marrón 330 de sus cortezas. Las pocas hojas que quedan son solo un breve recuerdo de un amanecer con sombra. El asfalto y la pasividad del viento, quienes amenazan la lucidez.

  3. Evaluación de anemia ferropénica en la primera infancia del Municipio de Sonsón-Antioquia, 2007

    OpenAIRE

    Castillo Salgado, Tulia Isabel; Pérez Escobar, Rocío

    2014-01-01

    Objetivo: Determinar la prevalencia de anemia por deficiencia de hierro en niños de la primera infancia del municipio de Sonsón – Antioquia, en el año 2007. Metodología: Se realizó un estudio descriptivo transversal en 391 niños de 0 a 84 meses de edad del Municipio de Sonsón, Antioquia. Se estudiaron los parámetros de hemoglobina y ferritina sérica utilizando puntos de corte de la Organización Mundial de la Salud (OMS). Se calcularon las medidas de frecuencia y de resumen y los intervalos de...

  4. Alexander Falconer Sr Seamen's missionary in New Zealand, son Alexander Falconer medical superintendent for mentally ill, grandson Murray Falconer neurosurgeon.

    Science.gov (United States)

    Hawgood, Barbara J

    2016-08-01

    Alexander Falconer Sr (1843-1915) came from Scotland to New Zealand. A practical Christian, he set up places of relaxation for miners, sailors and soldiers; he became the Seamen's Missionary. Son, Dr Alexander Falconer (1874-1955) trained at Otago University Medical School. As medical superintendent for the mentally ill, he urged the early introduction of psychotherapy. His son, Murray Falconer (1910-1977) was the first Nuffield Dominions Clinical Fellow, training in neurosurgery in Oxford. He was the first director of the Guy's-Maudsley Neurosurgical Unit in London and was internationally known for the surgical management of temporal lobe epilepsy in adults and children. © The Author(s) 2016.

  5. La riqueza y la pobreza de las naciones. ¿Por qué algunas son tan ricas y otras tan pobres?

    Directory of Open Access Journals (Sweden)

    Abel Ignacio López

    2001-01-01

    Full Text Available Landes, David. La riqueza y la pobreza de las naciones. ¿Por qué algunas son tan ricas y otras son tan pobres?, Barcelona, Editorial Crítica, 1999, 604 páginas. ¿Porqué hay naciones pobres y naciones ricas y cuál es la contribución de la historia en la comprensión de esta cuestión? El autor entiende por cultura el espíritu de empresa, el conjunto de valores que guían la conducta de una población, el dominio de la ciencia, la tecnología y el espíritu racional.

  6. La riqueza y la pobreza de las naciones. ¿Por qué algunas son tan ricas y otras tan pobres?

    OpenAIRE

    Abel Ignacio López

    2010-01-01

    Landes, David. La riqueza y la pobreza de las naciones. ¿Por qué algunas son tan ricas y otras son tan pobres?, Barcelona, Editorial Crítica, 1999, 604 páginas. ¿Porqué hay naciones pobres y naciones ricas y cuál es la contribución de la historia en la comprensión de esta cuestión? El autor entiende por cultura el espíritu de empresa, el conjunto de valores que guían la conducta de una población, el dominio de la ciencia, la tecnología y el espíritu racional.

  7. Failed Mothers, Monster Sons. Reading Shakespeare’S Richard Iii as a Fairy Tale

    Directory of Open Access Journals (Sweden)

    Percec Dana

    2014-03-01

    Full Text Available The paper looks at Shakespeare’s historical play Richard III and its fairy tale-like character given by the configuration of the main character as an arch-villain and the presence of motifs and patterns typically associated with the fairy tale genre. More specifically, it considers the mother-son relationship between the Duchess of York and Richard in the light of the motif of monstrous birth. It is not a coincidence that the emergence of such motifs coincides with the historical contexts of the early modern period. Reading Richard III in this key is related to the revisionist approach to chronicle plays.

  8. Estudo do solo-cimento-autoadensável produzido com solos da região do Porto-PT. PARTE II: avaliação da resistência e desempenho mecânico por meio da medição da resistividade elétrica e velocidade de propagação de ondas de ultrassom.

    Directory of Open Access Journals (Sweden)

    Marco Antônio Morais Alcantara

    2014-09-01

    Full Text Available (D.O.I.: 10.5216/reec.V9i1.29946 RESUMO: O artigo apresenta um estudo do solo-cimento autoadensável, sobre utilização da medição das propriedades relativas à resistividade elétrica e da velocidade de propagação de ondas de ultrassom, como meios de se buscar subsídios para esclarecer o processo de estabilização, bem como de se encontrar um meio indireto para a estimativa do valor da resistência e do desempenho mecânico. Para tanto, foi realizado um experimento a partir da utilização de um solo residual da região do Porto-Pt, cimento Portland, água, e aditivo de atuação estérica e eletrostática. A proporção dos materiais foi adotada a partir do peso seco do solo, conforme teores que variaram de 20, 25, e 30% de cimento, 41, 44 e 47% para a água, e 0,66, 0,80 e 0,93% para a variação do teor do superplastificante. Os ensaios no realizados no estado fresco procuraram seguir os protocolos de avaliação utilizados para os casos de argamassas e de concretos autoadensáveis; e, no estado endurecido, foram realizados os ensaios de resistência à compressão simples, resistência à flexão, e a avaliação dos valores da resistividade elétrica e da velocidade da propagação de ondas ultrassom. Os resultados indicaram haver aproximação entre o solo-cimento-auto-adensável e os concretos e argamassas; bem como, a variação dos valores da resistividade elétrica e da velocidade de propagação de ondas de ultrassom se apresentaram coerentes com a idade de cura e com os valores de resistência mecânica alcançados. ABSTRACT: The article presents a study of the soil-cement self-compacting, on the feasibility of using the measurement of the properties on the electrical resistivity and the speed of propagation of ultrasound waves as a means of seeking information to clarify the stabilization process as well as to find an indirect means for estimating the value of resistance and mechanical performance. Therefore, an experiment

  9. ¿Son efectivas las intervenciones para reducir el consumo de sodio en la dieta?

    Directory of Open Access Journals (Sweden)

    Gabriel Rada

    2015-09-01

    Full Text Available Las personas que consumen más sodio tienen cifras de presión arterial más alta, lo cual aumenta su morbimortalidad cardiovascular. El consumo de sodio en países latinoamericanos duplica o triplica lo recomendado, lo que ha llevado a redoblar los esfuerzos por abordar este problema. Los cambios de conducta y modificación de estilos de vida son difíciles de conseguir y mantener en el tiempo, por lo que las intervenciones a este nivel suelen precisar un abordaje desde múltiples perspectivas.

  10. VISUALIZACIÓN CIENTÍFICA EN EL APRENDIZAJE DE FÍSICA

    Directory of Open Access Journals (Sweden)

    Francisco Frutos Alfaro

    2010-01-01

    Full Text Available La existencia de material de apoyo para la enseñanza basado en programas de visualización científica interactiva es importante en el desarrollo del aprendizaje de los estudiantes. Debido al avance tecnológico actual, programas de esta naturaleza son factibles. En este artículo discutiremos acerca de la creación, aplicación y ventajas educativas de este tipo de materiales. Los programas de visualización por computadora, que se han desarrollado para investigar los plasmas convectivos en las celdas solares, las trayetorias de los rayos de luz cuando pasan cerca de los agujeros negros, los lentes gravitacionales y la propagación de los frentes de onda en presencia de agujeros negros rotantes, han mostrado ser útiles en la enseñanza de estos difíciles tópicos de la física teórica.

  11. A new family of N dimensional superintegrable double singular oscillators and quadratic algebra Q(3) ⨁ so(n) ⨁ so(N-n)

    Science.gov (United States)

    Fazlul Hoque, Md; Marquette, Ian; Zhang, Yao-Zhong

    2015-11-01

    We introduce a new family of N dimensional quantum superintegrable models consisting of double singular oscillators of type (n, N-n). The special cases (2,2) and (4,4) have previously been identified as the duals of 3- and 5-dimensional deformed Kepler-Coulomb systems with u(1) and su(2) monopoles, respectively. The models are multiseparable and their wave functions are obtained in (n, N-n) double-hyperspherical coordinates. We obtain the integrals of motion and construct the finitely generated polynomial algebra that is the direct sum of a quadratic algebra Q(3) involving three generators, so(n), so(N-n) (i.e. Q(3) ⨁ so(n) ⨁ so(N-n)). The structure constants of the quadratic algebra itself involve the Casimir operators of the two Lie algebras so(n) and so(N-n). Moreover, we obtain the finite dimensional unitary representations (unirreps) of the quadratic algebra and present an algebraic derivation of the degenerate energy spectrum of the superintegrable model.

  12. ¿Qué hogares colombianos son pobres? una aproximación desde la ECV del 2003

    Directory of Open Access Journals (Sweden)

    Adriana Carolina Silva Arias

    2007-01-01

    Full Text Available Este artículo analizó los conceptos y medidas de pobreza. A partir de esta perspectiva, se estudió quiénes son pobres en Colombia y qué características de los hogares determinan dicha condición para el 2003. A partir de la Encuesta de Calidad de Vida, se realizó un análisis logit para identifi car y medir la incidencia de algunos factores en la probabilidad de que un hogar sea clasifi cado como pobre. Estas estimaciones mostraron que los hogares que tienen más probabilidad de considerarse como pobres son aquellos en los que los jefes de hogar eran analfabetas, mujeres, los que se ocuparon en labores agrícolas o que hacían parte de alguna etnia. Adicionalmente, se encontró que los hogares que tenían menores de 12 años tuvieron más de probabilidad de ser pobres. Finalmente, los hogares cuyo jefe de hogar tenía mayor nivel educativo, tenían menor probabilidad de ser pobres, siendo mayor el efecto educativo de su cónyuge.

  13. Contribuciones tecnicas para la medida de la contaminacion electromagnetica de microondas. Estudio en diversas poblaciones

    Science.gov (United States)

    Segura Garcia, Jaume

    La contaminacion ambiental por campos electromagneticos ha resultado ser en estos ultimos anos uno de los problemas mas acuciantes del panorama tecnologico y de salud publica. En el primero de los casos porque las inversiones realizadas son enormes y en el segundo porque cada vez es mayor el numero de articulos, "technical reports" e informes medicos que afirman la existencia de una cierta causalidad, aunque sea debil, entre los campos electromagneticos y ciertos cuadros sintomatologicos. En nuestro caso, hemos dedicado bastantes esfuerzos a investigar el llamado "sindrome de radiofrecuencia / microondas", denominado asi en la literatura cientifica por presentarse en operarios de estaciones de radar y en trabajadores de potentes emisoras de radio y television. En esta memoria presentamos un resumen del trabajo realizado durante los ultimos anos en la medida de la contaminacion electromagnetica ambiental asociado a las comunicaciones inalambricas. En ella se recogen los fundamentos fisicos y propiedades de las ondas electromagneticas, la tecnologia empleada en los sistemas de telefonia celular y los antecedentes relativos a la investigacion de la interaccion de las ondas electromagneticas con organismos vivos. Se desarrolla un procedimiento de medida que ha conducido a la elaboracion de los primeros "mapas de radiofrecuencia" similares, en el aspecto descriptivo, a los mapas de ruido desarrollados en el area de la contaminacion acustica. Por ultimo, se analiza la respuesta subjetiva de los residentes, personas que viven en el entorno de cobertura de las estaciones base de telefonia movil y que se ven sometidos a determinados niveles de radiacion electromagnetica, con el fin de situar este fenomeno al nivel que le corresponde en el ambito de la respuesta subjetiva ciudadana.

  14. Análisis de un perfil de temperatura anómalo en la Región Norte del Golfo de California

    Directory of Open Access Journals (Sweden)

    Andrés García

    2006-01-01

    Full Text Available Una gran mortandad de fauna marina en la Región Norte del Golfo de California (RNGC en el invierno de 1994-1995 es atribuida inicialmente a un derrame intencional de un químico por parte de narcotraficantes; tal aseveración es refutada por un análisis de datos de temperatura y circulación tomados en las mismas fechas en una intensa campaña oceanográfica. Los datos sugieren que la devastación de la fauna marina fue debida a un fenómeno puramente físico-biológico que causó una fuerte marea roja. Al parecer la marea roja fue generada por un tren de ondas baroclínicas interestacionales de Kelvin que al ingresar a la RNGC incrementaron la temperatura de la columna de agua y que, además, rompieron la circulación normal hasta, incluso, invertirla. Además de los datos, la anomalía es evidenciada usando un modelo de mezcla unidimensional: primero pronosticando el perfil de temperatura normal debido al efecto puramente meteorológico y segundo pronosticando el perfil de temperatura alimentando el modelo con datos obtenidos de sensores de temperatura agregados a los corrientímetros anclados en esta zona. Los resultados de la simulación con el modelo de mezcla son contundentes, e indican una fuerte anomalía de temperatura en la columna de agua durante diciembre de 1994-enero de 1995. La presencia de ondas baroclínicas tipo Kelvin es detectada utilizando los resultados obtenidos por el modelo Naval Research Laboratory Layered Ocean Model (NLOM

  15. Evolution of the uranium local environment during alteration of SON68 glass

    International Nuclear Information System (INIS)

    Jollivet, Patrick; Auwer, Christophe Den; Simoni, Eric

    2002-01-01

    The speciation of uranium in SON68 glass specimens doped with 0.75-3.5 wt% uranium and in the gels formed by alteration of the specimens was investigated by X-ray absorption spectroscopy. In the glasses, uranium is present at oxidation state VI and coordination number 6 with the same average distances than those found in a UO 3 type environment. The U-O distances and uranium coordination numbers are identical throughout the uranium concentration range. During glass alteration the uranium remains at oxidation state VI in the gels, but was found in the uranyl form. An increase in the equatorial distances (from 2.20 and 2.32 A in the glass to respectively 2.22 and 2.39 A in the gel) and coordination numbers (to about 7 and 8, respectively) was observed

  16. The global tantalum industry and Sons of Gwalia Ltd

    International Nuclear Information System (INIS)

    Paull, D.

    2002-01-01

    Sons of Gwalia Ltd., in Perth Australia is a long-term supplier of tantalum (Ta), a valuable rare metal with adequate supply. Tantalum is soft and ductile with high melting and boiling points and a low co-efficient of thermal expansion. It has excellent capacity to store and release electrical charge and offers exceptional resistance to corrosion. Its' main use is in consumer electronics such as mobile phones, laptop computers, DVD players, personal video recorders and MP-3 players. For automotive electronics, tantalum is used for air-bags, audio systems, navigation systems, anti-lock break systems and under the hood vehicle management systems. The super alloy is also in demand by the aerospace industry and for turbine blades for power stations. The total demand of Tantalum in 2000 was 5 million lbs. Demand growth has increased steadily since 1993 with perhaps a slight increase in the past 5 years. Resources are estimated at a 125 year supply based on year 2000 production rates. 41 per cent of the world supply of tantalum is obtained from Australia, 13 per cent from Africa, 16 per cent from America, 22 per cent from Asia. The Greenbushes mine in Australia is the world's largest tantalum mine with 80 million lbs Ta, followed by Australia's Wodgina Mine with 50 million lbs Ta. Both mines are expected to be operational for the next 25 years. 12 figs

  17. QCD Precision Measurements and Structure Function Extraction at a High Statistics, High Energy Neutrino Scattering Experiment: NuSOnG

    International Nuclear Information System (INIS)

    Adams, T.; Batra, P.; Bugel, Leonard G.; Camilleri, Leslie Loris; Conrad, Janet Marie; Fisher, Peter H.; Formaggio, Joseph Angelo; Karagiorgi, Georgia S.; )

    2009-01-01

    We extend the physics case for a new high-energy, ultra-high statistics neutrino scattering experiment, NuSOnG (Neutrino Scattering On Glass) to address a variety of issues including precision QCD measurements, extraction of structure functions, and the derived Parton Distribution Functions (PDFs). This experiment uses a Tevatron-based neutrino beam to obtain a sample of Deep Inelastic Scattering (DIS) events which is over two orders of magnitude larger than past samples. We outline an innovative method for fitting the structure functions using a parameterized energy shift which yields reduced systematic uncertainties. High statistics measurements, in combination with improved systematics, will enable NuSOnG to perform discerning tests of fundamental Standard Model parameters as we search for deviations which may hint of 'Beyond the Standard Model' physics

  18. ¿Son los MOOC una alternativa de aprendizaje?

    Directory of Open Access Journals (Sweden)

    Antonio Ramón Bartolomé Pina

    2015-01-01

    Full Text Available Este trabajo reflexiona sobre los MOOC como entornos de aprendizaje. El número de cursos masivos abiertos y en línea (MOOC ha crecido exponencialmente en pocos años desde que fueron introducidos. Los MOOC son considerados una nueva forma de entornos virtuales de aprendizaje potenciados por la tecnología. Se consideran dos tipos de MOOC: unos los organizados por Siemens y Downes (cMOOC y otros los desarrollados en lugares como Stanford, con muchos estudiantes y loables objetivos (xMOOC; estos tienen también sus debilidades. Aunque han sido recibidos con altas expectativas, también han encontrado una fuerte oposición que está aumentando con el tiempo, lo que nos permite estudiar este fenómeno en profundidad. Aunque todavía hay pocas investigaciones empíricas sobre los efectos de los MOOC en el aprendizaje, este estudio trata de arrojar luz sobre el tema desde un punto de vista teórico. En primer lugar exploraremos las expectativas positivas y negativas generadas. Los MOOC pueden constituir una buena propuesta a gran escala, lo que solo es posible para unas pocas grandes instituciones. No hay estudio de mercado, ni modelo de negocio, ni investigaciones empíricas que permitan confirmar los anuncios de sus efectos positivos. Revisaremos las teorías del aprendizaje recientes y clásicas respecto a su capacidad para explicar el proceso de aprendizaje y compararemos los cursos en línea tradicionales, los xMOOC y los cMOOC en relación a su potencial para apoyar el aprendizaje y su auto-regulación.

  19. Similarities of Variant Creutzfeldt-Jakob Disease Strain in Mother and Son in Spain to UK Reference Case.

    Science.gov (United States)

    Diack, Abigail B; Boyle, Aileen; Ritchie, Diane; Plinston, Chris; Kisielewski, Dorothy; de Pedro-Cuesta, Jesús; Rábano, Alberto; Will, Robert G; Manson, Jean C

    2017-09-01

    We investigated transmission characteristics of variant Creutzfeldt-Jakob disease in a mother and son from Spain. Despite differences in patient age and disease manifestations, we found the same strain properties in these patients as in UK vCJD cases. A single strain of agent appears to be responsible for all vCJD cases to date.

  20. Suh Yang Park, who Became a Doctor as a Son of a Butcher

    Directory of Open Access Journals (Sweden)

    PARK Hyoung Woo

    2006-12-01

    Full Text Available Dr. Suh Yang Park was born in 1885 as a son of a butcher, which was the lowest class at that time in Korea. However, contact with western missionaries, including Dr. O. R. Avison, provided him with an understanding of western civilization. After entering Chejungwon Medical School in 1900, Dr. Park learned basic sciences, basic medical sciences like anatomy and physiology, and other Western medical specialties such as internal medicine and surgery. He graduated from medical school in 1908 and received Government Certificate from Home Office, the first in Korea in this field, which granted the right to practice medicine. His certificate number was 4th overall. As both a doctor and a talented musician, Dr. Park actively participated in the social enlightenment movement. He was quite progressive in his time, having surpassed the social limitations as a son of a butcher, as well as actively propagating his knowledge of Western civilization onto others. After graduation, he had served as a professor at the school he graduated from, until he went into exile in Manchuria in 1917 due to the annexation of Korea by Japan in 1910. There, he opened a hospital and provided medical treatment for Koreans. He also established a school for young Koreans, inspiring them with a sense of nationalism. Also, Dr. Park was an active member of various Independence Movement Organizations in Manchuria. Then in 1932, at the time when Japan took control of Manchuria, his school was closed down. As a result, Dr. Park couldn't help but stop his anti-Japanese activities. In 1936, he returned to his homeland and passed away in 1940, just five years before the liberation of Korea from Japanese occupation.

  1. [Suh Yang Park, who became a doctor as a son of a butcher].

    Science.gov (United States)

    Park, Hyoung Woo; Hong, Jung Wan

    2006-12-01

    Dr. Suh Yang Park was born in 1885 as a son of a butcher, which was the lowest class at that time in Korea. However, contact with western missionaries, including Dr. 0. R. Avison, provided him with an understanding of western civilization. After entering Chejungwon Medical School in 1900, Dr. Park learned basic sciences, basic medical sciences like anatomy and physiology, and other Western medical specialties such as internal medicine and surgery. He graduated from medical school in 1908 and received Government Certificate from Home Office, the first in Korea in this field, which granted the right to practice medicine. His certificate number was 4th overall. As both a doctor and a talented musician, Dr. Park actively participated in the social enlightenment movement. He was quite progressive in his time, having surpassed the social limitations as a son of a butcher, as well as actively propagating his knowledge of Western civilization onto others. After graduation, he had served as a professor at the school he graduated from, until he went into exile in Manchuria in 1917 due to the annexation of Korea by Japan in 1910. There, he opened a hospital and provided medical treatment for Koreans. He also established a school for young Koreans, inspiring them with a sense of nationalism. Also, Dr. Park was an active member of various Independence Movement Organizations in Manchuria. Then in 1932, at the time when Japan took control of Manchuria, his school was closed down. As a result, Dr. Park couldn't help but stop his anti-Japanese activities. In 1936, he returned to his homeland and passed away in 1940, just five years before the liberation of Korea from Japanese occupation.

  2. DISEÑO Y CONSTRUCCIÓN DE UNA INTERFAZ ELECTRÓNICA QUE PERMITA RECOGER LOS BIPOTENCIALES ELÉCTRICOS DEL CEREBRO DE UN PACIENTE MEDIANTE TECNOLOGÍA INALÁMBRICA PARA ENVIARLOS A UNA PC

    OpenAIRE

    Gavino Morales, Cristhian Andres; Gallardo Hi Fong, Josue Enrique

    2016-01-01

    El presente trabajo se encuentra dirigido hacia el estudio de la actividad eléctrica del cerebro, el cual permitirá visualizar cada una de las ondas cerebrales del individuo de forma remota, para lo cual se ha desarrollado un electroencefalógrafo. El estudio de las ondas cerebrales sirve para detectar anomalías en actividad eléctrica del cerebro; para la detección de enfermedades que alteran el correcto funcionamiento del cerebro y su análisis, se...

  3. Uso da ressonância em cordas para ensino de física

    OpenAIRE

    Gomes,Cezar Augusto; Lüdke,Everton

    2011-01-01

    Nesse trabalho, discutimos um experimento laboratorial de baixo custo para o estudo da teoria de ondas estacionárias em cordas vibrantes. Fazendo uso de um aparato eletrônico relativamente simples, baseado na realimentação eletromagnética, conseguimos verificar tanto a harmonicidade das ondas estacionárias quanto a relação numérica existente entre os harmônicos presentes em oscilações obtidas para um dado modo de excitação.

  4. Linking objects in the process of mourning for sons disappeared in war: Croatia 2001.

    Science.gov (United States)

    Jurcević, Slavica; Urlić, Ivan

    2002-04-01

    Mothers use linking object to externalize the complex aspects of their relationship to the loss of their child. We analyzed the linking objects that mothers kept in memory of their sons who disappeared in the 1991-1995 war in Croatia or whose remains were uncovered and identified long time after they had gone missing. The case study of disturbed mourning included 26 mothers of Croatian soldiers from Croatian Osijek-Baranja County who went missing in war or whose remains were recovered and identified long after they had gone missing. The mothers were selected independently by the president of the Association of Families of Missing and Detained Croatian Soldiers and agreed to participate in the study in 2001. They were interviewed in their homes, their testimonies were recorded, and photographs of the linking objects taken. Linking objects were classified according to the Volkan's four-group classification. Out of four Volkan's groups of linking objects, we identified the objects belonging to the first three. Those were 1) objects that had been worn by the deceased (clothes, wrist-watch, ring, or glasses), (6/26); 2) objects that could be viewed in the psychoanalytic sense as an extension of the body of the disappeared or dead person, such as a camera (4/26); and 3) objects with realistic or symbolic resemblance to the deceased, usually a photograph (8/26). None of the examined objects belonged to the fourth Volkan's group (objects at hand when the news of the death came or objects present at the funeral, things that could be considered last-minute objects, ie, related to the moment when the deceased was last seen alive). However, 8/26 objects formed a new hitherto undescribed group. Mothers used such objects to create a memorial shrine to their sons. A photograph of the missing person or person whose remains were identified long after he had gone missing occupied a central place at the shrine, and was surrounded by other symbols of the Catholic iconography (Virgin

  5. Achados eletrencefalográficos em crianças com crises convulsivas nos primeiros 12 meses de idade

    Directory of Open Access Journals (Sweden)

    Rubens Moura Ribeiro

    1966-09-01

    Full Text Available São analisados os EEG de 65 crianças com diversos tipos de crises convulsivas ocorrendo nos primeiros 12 meses de vida. Alterações eletrencefalográficas foram registradas em 55 (84,5%, sendo o EEG normal em 10 casos (15,5%. A disritmia paroxística por onda "sharp" focal foi assinalada em 27 pacientes (41,5%; a disritmia paroxística por onda espícula focal em 3 (4,6%; ondas delta em 27 (41,5%; desorganização do ritmo em 3 (4,6%; depressão da atividade elétrica cerebral em 7 (10,7% e alterações eletrencefalográficas de tipo hipsarritmia em 2 (3%. São feitas considerações a respeito dos prováveis mecanismos responsáveis pela propagação das descargas convulsiógenas no EEG dêsses pacientes, assim como a eventual correlação eletroclínica.

  6. Efectos no lineales fotoinducidos en cristales líquidos

    Directory of Open Access Journals (Sweden)

    Juan A. Reyes

    2001-01-01

    Full Text Available Se presentan dos ejemplos en los que se aplica un formalismo analítico que permite describir una amplia variedad de fenómenos no lineales que ocurren cuando un campo óptico se propaga en un cristal líquido. Primero se describe la propagación de ondas planas en celdas rectangulares formadas por cristales líquidos nemáticos, tomando en cuenta su acoplamiento con la orientación. Posteriormente se analiza la propagación de un paquete de ondas en la celda. Se muestra que existe un efecto de guía de ondas en la propagación de los campos ópticos y que los modos transversales magnéticos (TM de la radiación electromagnética se pueden propagar como solitones ópticos. En ausencia de absorción, se calculan explícitamente diversas propiedades de los solitones.

  7. Bad Boys Meet the Swan of Avon: A Re-Visioning of Hamlet in Sons of Anarchy

    Directory of Open Access Journals (Sweden)

    Burzyńska Katarzyna

    2017-12-01

    Full Text Available This article investigates the intersections between Shakespeare’s Hamlet and a popular TV series Sons of Anarchy (SOA, loosely based on the Shakespearean original. The crime drama series revolves around an outlaw motorcycle club that literally “rules” a fictional town in California like an old royal family with its own brutal dynastic power squabbles and dark family secrets. The club is governed by an unscrupulous President Clay and an equally violent, though more conflicted, Vice President Jax Teller, the son of the late President, who had died in mysterious circumstances. In the article I argue that the popularity of the series lies not in its graphic scenes of violence, over-the-top Harley chases, and sex intrigues, but rather in its Shakespearean and Renaissance structure. SOA, dubbed as “Hamlet on Harleys”1, is an appropriation rather than an adaptation of Shakespeare’s tragedy, which makes it a truly transmedial phenomenon. The article investigates a fascinating blend of seemingly marginal elements of modern American culture and the canonical British tragedy. It also addresses the connections between the lifestyles of the so called outlaw MC clubs and the early modern family structure as presented in Hamlet, focusing on the issues of power and gender relations.

  8. Simulation of molecular transitions using classical trajectories

    Energy Technology Data Exchange (ETDEWEB)

    Donoso, A.; Martens, C. C. [University of California, California (United States)

    2001-03-01

    In the present work, we describe the implementation of a semiclassical method to study physical-chemical processes in molecular systems where electronic state transitions and quantum coherence play a dominant role. The method is based on classical trajectory propagation on the underlying coupled electronic surfaces and is derived from the semiclassical limit of the quantum Liouville equation. Unlike previous classical trajectory-based methods, quantum electronic coherence are treated naturally within this approach as complex weighted trajectory ensembles propagating on the average electronic surfaces. The method is tested on a model problem consisting of one-dimensional motion on two crossing electronic surfaces. Excellent agreement is obtained when compared to the exact results obtained by wave packet propagation. The method is applied to model quantum wave packet interferometry, where two wave packets, differing only in a relative phase, collide in the region where the two electronic surfaces cross. The dependence of the resulting population transfer on the initial relative phase of the wave packets is perfectly captured by our classical trajectory method. Comparison with an alternative method, surface hopping, shows that our approach is appropriate for modelling quantum interference phenomena. [Spanish] En este trabajo se describe la implementacion de un metodo semiclasico para estudiar procesos fisicos-quimicos en sistemas moleculares donde las transiciones entre estados electronicos y las coherencias cuanticas juegan un papel predominante. El metodo se basa en la propagacion de trayectorias clasicas sobre las correspondientes superficies electronicas acopladas y se deriva a partir del limite semiclasico de la ecuacion cuantica de Liouville. A diferencia de metodos previos basados en trayectoria clasica, dentro de este esquema, las coherencias electronicas cuanticas son tratadas de manera natural como ensamble de trayectorias con pesos complejos, moviendose en

  9. The role of pH in the vapor hydration at 175 °C of the French SON68 glass

    International Nuclear Information System (INIS)

    Ait Chaou, Abdelouahed; Abdelouas, Abdesselam; El Mendili, Yassine; Martin, Christelle

    2017-01-01

    The French simulated nuclear waste SON68 glass was altered in the presence of water vapor at 175 °C and 98% of relative humidity under several atmospheres (NH_3, H_2S, CO_2 and argon). The objectives were to study the role of pH on hydration kinetics and secondary phases formation. The hydration was followed by infrared spectroscopy and the nature and extent of alteration products were determined by characterizing the reacted glass surface with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), μ-Raman spectroscopy and X-ray diffraction (XRD). The glass hydration/alteration rate clearly increased with increasing pH, that is controlled by the gas atmosphere, as the following: NH_3 > Ar > CO_2 > H_2S. This can directly be linked to the secondary phases precipitated on the glass surface. Hence, the major alteration products observed at high pH (under NH_3 and Ar) are analcime and Ca-silicates hydrates (CSH) while at low pH (under CO_2 and H_2S) only a hydrated gel layer was identified. - Highlights: • The vapor hydration study of the SON68 glass under geological conditions. • The secondary phases formation in the alteration of SON68 glass. • The pH effect on the alteration kinetics of glass.

  10. Seismic Interpretation of the Nam Con Son Basin and its Implication for the Tectonic Evolution

    Directory of Open Access Journals (Sweden)

    Nguyen Quang Tuan

    2016-06-01

    Full Text Available DOI:10.17014/ijog.3.2.127-137The Nam Con Son Basin covering an area of circa 110,000 km2 is characterized by complex tectonic settings of the basin which has not fully been understood. Multiple faults allowed favourable migration passageways for hydrocarbons to go in and out of traps. Despite a large amount of newly acquired seismic and well data there is no significant update on the tectonic evolution and history of the basin development. In this study, the vast amount of seismic and well data were integrated and reinterpreted to define the key structural events in the Nam Con Son Basin. The results show that the basin has undergone two extentional phases. The first N - S extensional phase terminated at around 30 M.a. forming E - W trending grabens which are complicated by multiple half grabens filled by Lower Oligocene sediments. These grabens were reactivated during the second NW - SE extension (Middle Miocene, that resulted from the progressive propagation of NE-SW listric fault from the middle part of the grabens to the margins, and the large scale building up of roll-over structure. Further to the SW, the faults of the second extentional phase turn to NNE-SSW and ultimately N - S in the SW edge of the basin. Most of the fault systems were inactive by Upper Miocene except for the N - S fault system which is still active until recent time.

  11. "Daughter and son: a completely different story”? Gender as a moderator of the relationship between sexism and parental attitudes

    Directory of Open Access Journals (Sweden)

    Małgorzata Lipowska

    2016-09-01

    Full Text Available Background During childhood, parents are the first and most important individuals who form the base of the content of gender stereotypes in children. A parent’s expectations about the extent a child’s behaviour should be line with gender stereotypes also depends on the intensity of a parent’s sexism. A parent’s sexism may be exhibited in parental attitudes. Hence, in our study we analysed the relationship between parental ambivalent sexism and parental attitudes within dyads of mothers and fathers with a special focus on the role of the gender of both parents and children. Participants and procedure Two hundred and ninety-four couples of parents of five-year-olds (153 girls, 141 boys participated. The Ambivalent Sexism Inventory (ASI was used to measure levels of sexism, and the Parental Attitudes Scale (SPR was used to assess parental attitudes. Results In terms of the profile of parental attitudes, regardless of the child’s sex, mothers and fathers scored highest for inconsequent and demanding attitudes, and lowest for overprotective and autonomy attitudes. The child’s sex is also not important for the overall levels of parents’ sexism – fathers exhibit higher levels of hostile sexism in comparison to mothers. Only the mothers’ education level is important for levels of sexism – women with higher education exhibited the lowest levels of hostile sexism. The child’s sex moderates relationships between parents’ sexism and parental attitudes. In the case of mothers of sons, the intensity of benevolent sexism is negatively related to overprotective and demanding attitudes. The more educated the mothers of sons, the more demanding they were. For fathers of sons, the inconsequence attitude increases under the influence of both hostile and benevolent sexism. Among fathers of daughters, hostile sexism strengthens the overprotective attitude, while levels of both benevolent and hostile sexism as well as education influence the

  12. Litiasis única en vesícula doble tratada con ondas de choque extracorpórea Single lithiasis in double gallblader treated with extracorporeal shock waves

    Directory of Open Access Journals (Sweden)

    Domingo Pérez González

    2004-06-01

    Full Text Available La vesícula biliar doble es una anomalía congénita poco frecuente. Su diagnóstico puede realizarse con ultrasonido y colecistografía. Se presenta una paciente de 27 años de edad, con antecedentes de intolerancia a las grasas y cólicos biliares a repetición, con vesícula duplicada; exteriormente fundida y dos conductos císticos independientes que desembocan en el hepatocolécodo, con un cálculo único, de 12 mm de diámetro, retrotransparente y 0 unidades Houndfield, ubicado en el cuello de la vesícula más desarrollada. Se aplicaron 2 259 ondas de choque extracorpóreas de 20,4 kilovoltios, generadas por el principio electromagnético; en una sesión de litroticia. Se detuvo fragmentación completa del cálculo. El tratamiento fue ambulatorio. La paciente se reincorporó a su vida laboral a las 24 horas. Durante la expulsión de los fragmentos tuvo varias crisis de dolor que cedieron con analgésicos orales. A los 6 meses, la vesícula afectada se encontraba libre de fragmentos y funcional. No existió complicación y hasta el momento se mantiene asintomáticaDouble gall bladder is an uncommon congenital abnormality. It may be diagnosed by ultrasound and cholecystography. It is reported the case of a 27-year-old patient with history of intolerance to fats and repeated biliary cholics, with duplicated gallbladder externally fused, and two independent cystic ducts flowing to the hepatocholedoco with a single calculus of 12 mm of diameter, retrotransparent and 0 Houndfield units, located in the neck of the more developed gallbladder. 2 259 extracorporeal shock waves of 20.4 kilovolts generated by the electromagnetic principle were applied in a lithotripsy session. The complete fragmentation of the calculus was stopped. The treatment was ambulatory. The patient reincorporated to her working life at 24 hours. During the expulsion of the fragments, she had several pain crises that were resolved with oral analgesics. Six months later, the

  13. Valor clínico del análisis de la fase sistólica de la contracción ventricular con Doppler tisular en la discriminación de hipertrofia fisiológica de formas patológicas

    OpenAIRE

    Demián Chejtman; Sergio Baratta; Horacio Fernández; Alberto Marani; Fabián Ferroni; Jorge Bilbao; Carol Kotliar; Domingo Turri; Alejandro Hita

    2006-01-01

    RESUMEN Introducción La hipertrofia del ventrículo izquierdo (HVI) incluye diferentes etiologías, estados evolutivos y pronóstico. El Doppler tisular (DT) pulsado permite estudiar aspectos de la función miocárdica mediante el análisis de la velocidad regional. Objetivo Determinar la utilidad del análisis de las ondas del período isovolúmico (IVCa) y de la onda sistólica regional (“s”) del DT pulsado para diferenciar formas de hipertrofia ventricular izquierda. ...

  14. Avaliação da influência de alterações cardíacas na ultrassonografia vascular periférica de idosos

    OpenAIRE

    Ribeiro, Alcides José Araújo; Ribeiro, Andréa Campos de Oliveira; Rodrigues, Márcia Marisia Maciel; Negreiros, Sandra de Barros Cobra; Nogueira, Ana Cláudia Cavalcante; Almeida, Osório Luís Rangel; Silva, José Carlos Quináglia e; Paula, Ana Patrícia de

    2016-01-01

    Resumo Contexto As cardiopatias podem causar alterações no formato das ondas da ultrassonografia vascular (UV) em vasos periféricos. Essas alterações, tipicamente bilaterais e sistêmicas, são pouco conhecidas e estudadas. Objetivo Avaliar as ondas periféricas da UV de pacientes idosos para identificar alterações decorrentes de cardiopatias. Métodos Foram estudados 183 pacientes idosos submetidos a UV periférica no ano de 2014. Resultados Foram avaliados 102 mulheres (55,7%) e 81 homens (4...

  15. La comprensión del relato periodístico: ¿qué son los hechos?

    OpenAIRE

    Saharrea, Juan Manuel

    2013-01-01

    El objetivo de este trabajo echar luz acerca de la comprensión del relato periodístico planteando el debate filosófico acerca del estatus de los hechos. Tomando algunas distinciones de la filosofía del lenguaje y la epistemología contemporáneas definimos nuestra propia posición en relación con los hechos. De acuerdo con nuestra perspectiva los hechos, no son, bajo ningún aspecto, independientes de descripción. Planteamos las tesis del realismo y el relativismo en torno a los hechos y de cada ...

  16. Examination of the Film "My Father and My Son" According to the Basic Concepts of Multigenerational Family Therapy

    Science.gov (United States)

    Acar, Tulin; Voltan-Acar, Nilufer

    2013-01-01

    The aim of this study was to evaluate the basic concepts of multigenerational Family Therapy and to evaluate the scenes of the film ''My Father and My Son'' according to these concepts. For these purposes firstly basic concepts of Multigenerational Family Therapy such as differentiation of self, triangles/triangulation, nuclear family emotional…

  17. Ehlers-Danlos syndrome type IV : unusual congenital anomalies in a mother and son with a COL3A1 mutation and a normal collagen III protein profile

    NARCIS (Netherlands)

    Kroes, HY; Pals, G; van Essen, AJ

    A mother and son with Ehlers-Danlos syndrome (EDS) type IV and unusual congenital anomalies are described. The congenital anomalies include, in the mother, amniotic band-like constrictions on one hand, a unilateral clubfoot, and macrocephaly owing to normal-pressure hydrocephaly and, in the son, an

  18. Mid- to late Holocene climate-driven regime shifts inferred from diatom, ostracod and stable isotope records from Lake Son Kol (Central Tian Shan, Kyrgyzstan)

    Science.gov (United States)

    Schwarz, Anja; Turner, Falko; Lauterbach, Stefan; Plessen, Birgit; Krahn, Kim J.; Glodniok, Sven; Mischke, Steffen; Stebich, Martina; Witt, Roman; Mingram, Jens; Schwalb, Antje

    2017-12-01

    Arid Central Asia represents a key region for understanding climate variability and interactions in the Northern Hemisphere. Patterns and mechanisms of Holocene climate change in arid Central Asia are, however, only partially understood. Multi-proxy data combining diatom, ostracod, sedimentological, geochemical and stable isotope analyses from a ca. 6000-year-old lake sediment core from Son Kol (Central Kyrgyzstan) show distinct and repeated changes in species assemblages. Diatom- and ostracod-inferred conductivity shifts between meso-euhaline and freshwater conditions suggest water balance and regime shifts. Organism-derived data are corroborated by stable isotope, mineralogical and geochemical records, underlining that Son Kol was affected by strong lake level fluctuations of several meters. The δ13Ccarb/δ18Ocarb correlation shows repeated switchovers from a closed to an open lake system. From 6000 to 3800 and 3250 to 1950 cal. yr BP, Son Kol was a closed basin lake with higher conductivities, increased nutrient availability and a water level located below the modern outflow. Son Kol became again a hydrologically open lake at 3800 and 1950 cal. yr BP. Comparisons to other local and regional paleoclimate records indicate that these regime shifts were largely controlled by changing intensity and position of the Westerlies and the Siberian Anticyclone that triggered changes in the amount of winter precipitation. A strong influence of the Westerlies ca. 5000-4400, 3800-3250 and since 1950 cal. yr BP enhanced the amount of precipitation during spring, autumn and winter, whereas cold and dry winters prevailed during phases with a strong Siberian Anticyclone and southward shifted Westerlies at ca. 6000-5000, 4400-3800 and 3250-1950 cal. yr BP. Similarities between variations in winter precipitation at Son Kol and records of the predominant NAO-mode further suggest a teleconnection between wet (dry) winter climate in Central Asia and a positive (negative) NAO

  19. The Quest of Father and Son: Illuminating Character Identity, Motivation, and Conflict in Cormac McCarthy's "The Road"

    Science.gov (United States)

    Gilbert, Chris

    2012-01-01

    "The Road" has been an important part of the author's English IV Honors course for several years now. Undeniably bleak, it details a father and son's journey through a seared, post-apocalyptic wasteland. As they travel through the burnt remains of America, they are threatened by starvation, dehydration, and scattered, hostile humans. Although his…

  20. Giving Birth to Life--Again!: Bereaved Parents' Experiences with Children Born Following the Death of an Adult Son

    Science.gov (United States)

    Hamama-Raz, Yaira; Rosenfeld, Sarah; Buchbinder, Eli

    2010-01-01

    This article is based on a qualitative study examining the experiences of parents that lost a son during military service in Israel and consequently choose to give birth to another child. Seven couples and 3 mothers were interviewed for the study, and their interviews were analyzed using a phenomenological-hermeneutic approach. Three main themes…

  1. Sexual imprinting on continuous variation: do female zebra finches prefer or avoid unfamiliar sons of their foster parents?

    Science.gov (United States)

    Schielzeth, H; Burger, C; Bolund, E; Forstmeier, W

    2008-09-01

    Sexual imprinting on discrete variation that serves the identification of species, morphs or sexes is well documented. By contrast, sexual imprinting on continuous variation leading to individual differences in mating preferences within a single species, morph and sex has been studied only once (in humans). We measured female preferences in a captive population of wild-type zebra finches. Individual cross-fostering ensured that all subjects grew up with unrelated foster parents and nest mates. Females from two cohorts (N = 113) were given a simultaneous choice between (two or four) unfamiliar males, one of which was a genetic son of their foster parents (SFP). We found no significant overall preference for the SFP (combined effect size d = 0.14 +/- 0.15). Additionally, we tested if foster parent traits could potentially explain between-female variation in preferences. However, neither the effectiveness of cooperation between the parents nor male contribution to parental care affected female preferences for the son of the foster father. We conclude that at least in zebra finches sexual imprinting is not a major source of between-individual variation in mating preferences.

  2. El teléfono celular: una estrategia didáctica para la enseñanza del electromagnetismo

    Directory of Open Access Journals (Sweden)

    Domingo Padilla Arzúzar

    2010-10-01

    Full Text Available Las ondas electromagnéticas, oem, son una temática común en los currículos en las carreras de física e ingenierías. A pesar de ello, la manipulación de artefactos que conducen a que los estudiantes se formen una idea de los efectos de las oem es escasa, en gran medida por la falta de equipos de laboratorio adecuados. Debido a esta problemática, nuestra investigación nos condujo a utilizar el teléfono celular, tc, como instrumento de registro de las oem. Junto con los estudiantes, logramos construir un blindaje electromagnético para el tc y un reflector parabólico, en cuyo foco ubicamos un teléfono con conexión con el pc por el puerto usb para registrar las variaciones de la intensidad de la señal del operador celular.

  3. Electromagnetic fields and public health

    Directory of Open Access Journals (Sweden)

    1998-01-01

    Full Text Available Recientemente han proliferado notablemente tanto el número como la diversidad de fuentes de campos electromagnéticos que se usan en el hogar, la industria y el comercio. Estas fuentes, como la televisión, las computadoras, el radar y los innumerables y complejos equipos que se usan en la medicina y otros campos, han enriquecido y mejorado nuestro estilo de vida. Sin embargo, algunos estudios científicos parecen indicar que la exposición ambiental a ondas radioeléctricas aumenta el riesgo de cáncer, reduce la fecundidad, produce pérdida de la memoria y afecta adversamente al comportamiento y el desarrollo de los niños. Los conocimientos sobre el tema se han reunido ad hoc y son sumamente escasos, por lo cual en octubre de 1997 la OMS lanzó un proyecto de 5 años para coordinar una investigación internacional al respecto.

  4. El valor de los servicios bibliotecarios de extensión cultural: el caso del Centro de Documentación de Ingeniería, Universidad de Antioquia1

    Directory of Open Access Journals (Sweden)

    Damaris Lopera Cardona

    2016-01-01

    Full Text Available El desarrollo de la ingeniería y el del arte han sido destacados cada uno a su manera; sin embargo, históricamente han existido barreras que han dificultado la comunicación entre ambas áreas. Por esta razón, la Facultad de Ingeniería de la Universidad de Antioquia, por medio del Centro de Documentación de Ingeniería (CENDOI, está trabajando por una integración entre el arte y la ingeniería, teniendo en cuenta que son disciplinas que pueden complementarse para elevar el desarrollo social, cultural y educativo en un mundo globalizado que demanda una visión integradora. El presente trabajo expone la importancia de los servicios de extensión culturales ofrecidos por el CENDOI a los estudiantes y profesores de la Facultad de Ingeniería, a través de proyectos como: Vivarte, Semana del idioma, programa "Súmate al patrimonio, multiplica el conocimiento", exposiciones fotográficas temáticas sobre patrimonio, Caja Viajera, programas de radio "Sala de Historia" y "El Baúl de Sofía", concursos "El ingeniero artista" y "Fotografía cotidiana", Carnaval del libro, ciclos de videos y de audios cortos, campañas de sensibilización, entre otros. Asimismo, se describen los convenios realizados en el contexto de los servicios de extensión cultural, las limitaciones encontradas en la realización de estos servicios, y premios y reconocimientos recibidos por esta labor. Se concluye que la importancia de este tipo de servicios radia en la humanización del mundo académico y científico, promoviendo un diálogo entre las disciplinas para contribuir a una formación integral del estudiantado de la Facultad.

  5. Son preference among the historical Sandžak Muslim population

    Directory of Open Access Journals (Sweden)

    Čvorović Jelena

    2012-01-01

    Full Text Available This paper attempts to explain parental son preferences among historical Muslim population in the Sandžak region, southwestern Serbia. The paper draws upon data collected in the course of anthropological fieldwork studies in the region. The fieldwork was performed among Muslim and Christian families in Serbian rural area of Sandžak, measuring maternal fitness in relation to several variables. The data set comes from 120 women born between 1880-1924, representing so a historical demographic data based on individual and lineage records. These data were complemented with official records from Archive of Novi Pazar, whenever possible. In this Serbian rural area, land is still considered as an abundant resource, useful in establishing a family, livestock or agriculture. In the past, in spite of yearly fluctuations in production, lands and labor constituted a stable source of wealth from generation to generation. In this study, the data include the socio-economic status of each woman, assigned according to her husband’s family economic status: land-ownership vs. landless. This represents differences in resource availability in terms of nutrition, wealth and workload among these women. As the results show, the Muslim families, on average, left more surviving descendants through sons, in contrast with their Christian counterparts. The basic research question, then, is why? Furthermore, what were the impacts of particular behaviors on reproductive and lineage success, under particular social and ecological conditions? In this sample, regarding the Muslim families, the family structure was/is traditional and stratified, characterized by a large disparity in the status of males and females. Patrilineal inheritance, the concentration of wealth and power in males and the social restriction of women all characterize even today this patriarchal family arrangement. This supports the Trivers-Willard hypothesis, especially in terms of sex-biased parental

  6. The association between an abusive father-son relationship, quantity of alcohol consumption, and male-to-male alcohol-related aggression.

    Science.gov (United States)

    Miller, Peter; Hargreaves, Jessica; Curtis, Ashlee; Zinkiewicz, Lucy

    2013-09-01

    While alcohol consumption and heavy episodic (binge) drinking are well-established predictors of male-to-male alcohol-related aggression (MMARA), the role of the father-son relationship in MMARA has yet to be explored. This study therefore examined whether fathering by the biological father rather than another father figure, negative fathering, and gender role modeled by the father figure were significant predictors of involvement in MMARA, once drinking frequency and quantity and heavy episodic drinking were controlled for. A total of 121 university students aged 18 to 25 years (M = 20.63, SD = 1.77 years) voluntarily completed the online questionnaire. The only significant predictors of perpetration of MMARA were a more abusive paternal relationship and drinking quantity (number of standard drinks usually consumed when drinking). Negative father-son relationships may play a role in fostering young men's perpetration of MMARA in the barroom context. Copyright © 2013 by the Research Society on Alcoholism.

  7. Los modelos de generación de oleaje de viento: características, evolución y futuras aplicaciones en colombia

    OpenAIRE

    MONTOYA RAMÍREZ, RUBÉN DARÍO; OSORIO ARIAS, ANDRÉS

    2009-01-01

    Durante el siglo pasado diferentes autores presentaron sus teorías sobre el oleaje basados en las leyes de la física relacionadas con el movimiento ondulatorio, estas teorías hicieron representaciones de las olas del mar como ondas de amplitud finita o de amplitud pequeña en las cuales la interacción entre ondas podía considerarse como lineal; sin embargo quedaron incompletas al tratar de explicar los mecanismos físicos relacionados con el crecimiento del oleaje. Sólo fue hasta mediados del ...

  8. Diseño y construcción de una interfaz electrónica que permita recoger los bipotenciales eléctricos del cerebro de un paciente mediante tecnología inalámbrica para enviarlos a una pc

    OpenAIRE

    Gavino Morales, Cristhian Andrés; Gallardo Hi-Fong, Josue Enrique; Yapur Auad, Miguel

    2014-01-01

    El presente trabajo se encuentra dirigido hacia el estudio de la actividad eléctrica del cerebro, el cual permitirá visualizar cada una de las ondas cerebrales del individuo de forma remota, para lo cual se ha desarrollado un electroencefalógrafo. El estudio de las ondas cerebrales sirve para detectar anomalías en actividad eléctrica del cerebro; para la detección de enfermedades que alteran el correcto funcionamiento del cerebro y su análisis, se utiliza un EEG. El diseño de este electroe...

  9. Valor clínico del análisis de la fase sistólica de la contracción ventricular con Doppler tisular en la discriminación de hipertrofia fisiológica de formas patológicas

    OpenAIRE

    Chejtman, Demian; Baratta, Sergio; Fernández, Horacio; Marani, Alberto; Ferroni, Fabián; Bilbao, Jorge; Kotliar, Carol; Turri, Domingo; Hita, Alejandro

    2006-01-01

    Introducción La hipertrofia del ventrículo izquierdo (HVI) incluye diferentes etiologías, estados evolutivos y pronóstico. El Doppler tisular (DT) pulsado permite estudiar aspectos de la función miocárdica mediante el análisis de la velocidad regional. Objetivo Determinar la utilidad del análisis de las ondas del período isovolúmico (IVCa) y de la onda sistólica regional ("s") del DT pulsado para diferenciar formas de hipertrofia ventricular izquierda. Material y métodos Se conformaron cinco ...

  10. Application of Sampling Based Model Predictive Control to an Autonomous Underwater Vehicle

    Science.gov (United States)

    2010-07-01

    tareas difíciles en ambientes atiborrados de reflexiones de onda tales como muelles y puertos. Sin embargo, dado que los UUVs tienen dinámicas áltamente...método está basado en el muestreo (es decir, discretización) del espacio de entrada en cada período de muestreo e implementación de una optimización...en un ambiente cargado de reflexiones de onda y a un UAV en un problema de mínimo común local. El algoritmo es luego usado en un modelo cinemático

  11. La radio en la era digital. Estudio de caso: programas de COPE creados para ser consumidos exclusivamente ‘online’

    Directory of Open Access Journals (Sweden)

    Rafael Galán Arribas

    2015-12-01

    Full Text Available El avance tecnológico ha traído dispositivos móviles más desarrollados, ágiles y potentes que junto con la aparición del 4G y el cable óptico han sido el perfecto cultivo para que se desarrollara el podcasting. Esto ha generado nuevas formas de consumo radiofónico y consumidores proactivos y, como consecuencia, las emisoras han creado un tipo de programas que no han sido emitidos a través de las ondas y que ahora se alojan en las webs de las principales cadenas españolas. La que más apuesta por esta novedosa forma de emisión es COPE y es la que se somete a estudio. Se analizan, a través de métodos cuantitativos y cualitativos, 2 emisiones de cada uno de los 16 programas. Los resultados indican que son descargables y que sólo se emiten a través de Internet, que su duración es variable y que los géneros más usados son los de información y opinión, el contenido es diferente al de la radio tradicional (analógica, cuentan con publicidad aunque en su mayoría es autopromoción y, por último, todos cuentan con páginas en Facebook y Twitter que por otra parte son las preferidas por los oyentes, las más usadas, en las que comparten enlaces a los programas y opinan sobre estos.

  12. Correlación entre los interhusos del ritmo alfa, el EMG de los gemelos y la oscilación de vaivén del individuo de pie

    Directory of Open Access Journals (Sweden)

    Jose H. Peñaloza Rojas

    1994-10-01

    Full Text Available En sujetos adultos normales se registraron simultáneamente: el electroencefalograma (EEG occipital, el electromiograma (EMG de los músculos gemelos y el movimiento oscilatorio de vaivén del individuo (EOsG en bipedestación, con ojos cerrados y abiertos. Mientras permanecen los sujetos experimentales con los ojos cerrados, el EEG muestra los husos de ritmo alfa bien integrados, unidos o separados por los interhusos los cuales son de duración y frecuencia variables. EI EMG es intermitente y las descargas de los potenciales musculares son de duración breve. EI EOsG esta formado por ondas de amplitud y duración variables. De la observación cuidadosa de estos registros simultáneos se puede inferir la existencia de una correlación temporal entre los tres eventos: primero los interhusos se registran previamente a la aparición del EMG, segundo el EMG precede al EOsG y tercero el EOsG aparece finalmente, como manifestación del vaivén del sujeto experimental. Es decir, la activación cerebral (interhusos influye sobre los músculos gastrocnemios (EM G para que estos se contraigan, enderezcan el cuerpo y corrijan la posición corporal. Como consecuencia de esto, se obtiene el EOsG. Por 10tanto.estos resultados sugieren que los interhusos son un fenómeno electrofisiológico normal resultante de la activación momentánea cerebral y que se registran después de que el individuo ha aprendido a mantenerse en bipedestación.

  13. ¿Son útiles las “métricas espaciales fragstats” para caracterizar entornos de movilidad urbanos?

    OpenAIRE

    Arranz, Aldo; Soria-Lara, Julio Alberto; Aguilera Benavente, Francisco

    2014-01-01

    El objetivo de alcanzar una mayor sostenibilidad ambiental en la planificación del transporte urbano ha sido una de las principales razones del desarrollo de conceptos, métodos y herramientas orientadas a vincular de manera efectiva la estructura urbana y el sistema de transporte. En este contexto, surgen los “entornos de movilidad” como instrumentos integrados de planificación con éxitos notables en diferentes ámbitos escalares y contextuales. Los “entornos de movilidad” son concebidos como ...

  14. Seismic survey in southeastern Socorro Island: Background noise measurements, seismic events, and T phases

    Energy Technology Data Exchange (ETDEWEB)

    Valenzuela, Raul W [Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, D.F. (Mexico); Galindo, Marta [Comprehensive Nuclear-Test-Ban Treaty Organization, IMS, Vienna (Austria); Pacheco, Javier F; Iglesias, Arturo; Teran, Luis F [Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, D.F. (Mexico); Barreda, Jose L; Coba, Carlos [Facultad de Ingenieria, Benemerita Universidad Autonoma de Puebla, Puebla (Mexico)

    2005-01-15

    espectrales de potencia en los cinco sitios son relativamente ruidosas en comparacion con las curvas mundiales de referencia. Este resultado concuerda con observaciones realizadas en otras islas pequenas. Las densidades espectrales de potencia permanecen constantes sin importar la hora del dia o el dia de la semana. Los efectos del ruido cultural en la isla son muy pequenos. Se identificaron los sitios con el mayor y el menor ruido. Esta informacion servira para determinar la ubicacion de la estacion de fase T que sera instalada conjuntamente por la Universidad Nacional Autonoma de Mexico y la Organizacion del Tratado para la Prohibicion Completa de Ensayos Nucleares. Durante el periodo de estudio se registraron seis sismos. Estos ocurrieron a distancias epicentrales entre 42 y 2202 km y tuvieron magnitudes entre 2.8 y 7.0. Dos sismos pequenos (M{sub c} = 2.8 y 3.3) y cercanos ocurrieron en la Zona de Fractura de Clarion. Los cuatro eventos mas grandes y mas lejanos generaron ondas T. La onda T producida por un temblor cerca de la costa de Guatemala tuvo una duracion de alrededor de 100 s y frecuencias entre 2 y 8 Hz, con un maximo en su amplitud aproximadamente a 4.75 Hz. El terremoto de Tehuacan del 15 de junio de 1999 (M{sub w} = 7.0) genero ondas P {yields} T y S {yields} T, ambas con energia entre 2 y 3.75 Hz. Dicho sismo ocurrio dentro de la placa subducida de Cocos a una profundidad de 60 km y el epicentro se localizo lejos de la costa del oceano Pacifico. Esto implica que un segmento largo de la trayectoria fue recorrido por tierra. Inicialmente la energia viajo en forma de ondas sismicas P y S, las cuales probablemente se propagaron por dentro de la placa subducida, y estas despues se convirtieron a energia acustica al pasar de la tierra al agua en el talud continental frente a la costa del oceano Pacifico. La duracion total de la fase T es cercana a los 500 s y alcanza su amplitud maxima alrededor de 200 s despues de la llegada de la onda P {yields} T. La fase T

  15. Bad Mothers and Monstrous Sons: Autistic Adults, Lifelong Dependency, and Sensationalized Narratives of Care.

    Science.gov (United States)

    Allen, Holly

    2017-03-01

    Sensationalized representations of autistic families in film and other media frequently feature violent encounters between mothers and sons. This essay analyzes two media stories and three films that suggest how limited-and therefore misleading-popular representations of the autism family are. Except for one of the films, these representations blame the problem of adult autistic dependency on either monstrous autism or bad mothering. Doing so elides collective social responsibility for autism care and denies the reality that autistic adults continue to have complex dependency needs that families cannot always meet. Narratives that sensationalize youth and adults with autism or scapegoat their maternal caregivers also diminish opportunities for social inclusion and for autistic people to live fully and dependently.

  16. Potenciais evocados auditivos de tronco encefálico em fumantes

    Directory of Open Access Journals (Sweden)

    Denise Miranda Terra Martins

    2016-02-01

    Full Text Available RESUMO Objetivo: comparar os resultados dos exames de potenciais evocados auditivos de tronco encefálico em indivíduos não tabagistas e tabagistas. Métodos: foram estudados 40 indivíduos, sendo 20 não tabagistas e 20 tabagistas, com idades entre 20 e 59 anos. Todos os participantes incluídos na pesquisa deveriam apresentar respostas de limiares tonais dentro dos padrões da normalidade e timpanometria tipo A com presença de reflexos acústicos contralaterais e ipsilaterais. Em ambos os grupos foram realizados os potenciais evocados auditivos de tronco encefálico (PEATE, por meio de cliques. Os parâmetros que foram utilizados na comparação dos dois grupos foram as latências absolutas das ondas I, III e V; as interlatências das ondas I-III, I-V e III-V em ambas as orelhas; a diferença da latência interpico I-V entre as duas orelhas e a diferença interaural da latência absoluta da onda V entre as duas orelhas. Resultados: os resultados encontrados mostraram que o grupo de tabagistas apresentou latência I da Orelha Direita (p=0,036, latência V da Orelha Direita (p=0,007, latência V da Orelha Esquerda (p=0,014, interlatência III-V da Orelha Direita (p=0,015 e Orelha Esquerda (p=0,016 significantemente maior que o grupo de não tabagistas. Não houve diferença significante na latência da onda V entre as duas orelhas. Conclusão: os resultados da pesquisa levaram à conclusão de que o tabaco é um fator de risco para o sistema nervoso auditivo central, que pode interferir nas latências e interlatências das ondas do PEATE no grupo de tabagistas quando comparado com o grupo de não tabagistas.

  17. A eletrencefalografia nos tumores intracranianos. Considerações sobre nove casos cirurgicamente verificados

    Directory of Open Access Journals (Sweden)

    Paulo Pinto Pupo

    1948-03-01

    Full Text Available Os autores, trabalhando com um eletrencefalógrafo Grass, de 6 inscritores, trazem os seus primeiros resultados em casos de tumores intracranianos cirurgicamente verificados (além de 2 já publicados anteriormente. São eles em número de 9. No primeiro, um abscesso profundamente situado no lobo frontal era traduzido por ondas delta e figuras de reverso, no eletrencefalograma do lobo frontal correspondente, ao lado de alterações difusas no restante do hemisfério cerebral, melhoradas em EEG feito ulteriormente, em perfeita concordância com o edema cerebral e o quadro clínico de hipertensão intracraniana inicial. No segundo, ondas extremamente lentas» difusas por todo um hemisfério, com figuras de reverso pré-fronto-parietais e ondas teta, indicavam um glioma difuso e grandemente lesivo para o parênquima nervoso. No terceiro, disritmias paroxísticas frontais predominantes se correlacionavam com antiga epilepsia devida a grande meningioma da foice naquela localização. O caso 4 mostrava ondas lentas difusas por todo um hemisfério cerebral, de predominância pré-frontal, com figuras de reverso bem assisaladas, coincidindo com carcinoma metastático de grande volume, de localização subfrontal. O caso 5 mostrava alterações eletrencefalográficas localizadas, parietoccipitais, à esquerda, coincidentes com meningioma angioblástico parasagital parietoccipital. O sexto se refere a um tumor enorme e consistente, com aspecto de papiloma, que, do prolongamento temporal de ventrículo lateral, comprimia as formações cerebrais suprajacentes, cujo EEG evidenciava alterações focais nítidas frontais e temporais, com ondas e figuras de reverso bem caracterizadas. O caso 7, pelo contrário, evidenciava alterações eletrencefalográficas difusas por todo um hemisfério e repercutindo sôbre a área frontal do hemisfério oposto, indicando lesão cerebral pré-central, concordando inteiramente com a clínica, com a ventrigulografia e com o

  18. DESARROLLO Y VALIDACIÓN DE UN MÉTODO ESPECTROFOTOMÉTRICO/COLORIMÉTRICO PARA LA DETERMINACIÓN DE CROMO (III EN LICORES RESIDUALES DE PIQUELADO-CURTIDO

    Directory of Open Access Journals (Sweden)

    Ramiro Escalera Vásquez

    2007-01-01

    Full Text Available Dos métodos no destructivos fueron desarrollados y validados para la determinación de concentraciones de sales de cromo en licores residuales de curtido que se producen en la fabricación de cueros: Un método espectrofotométrico y un método colorimétrico derivado. Los dos métodos se basan en el análisis de espectros de absorbancia-longitud de onda generados por soluciones patrón que fueron preparadas con los mismos reactivos químicos comerciales utilizados por una curtiembre local, en el intervalo de longitud de onda de 190-800 nm (UV-visible. Ambos métodos satisfacen los criterios fundamentales de validación: proporcionalidad (buena linealidad y buena sensibilidad dentro del intervalo de concentraciones de sales de cromo que se observa en los licores residuales de curtido; precisión (buena repetibilidad/reproducibilidad; exactitud (sin diferencias estadísticas respecto a métodos oficiales y selectividad (buena especificidad para la sal de cromo. Estos métodos son prácticos por su simplicidad, bajo costo y rapidez. Requieren equipos de bajo costo (un espectrofotómetro de rango visible o un colorímetro fabricado manualmente, usan los mismos reactivos químicos que se aplican en procesos de curtido corriente y no requieren de condiciones de seguridad especiales ni personal especializado. Los métodos pueden ser utilizados para el control de reciclado directo de licores de curtido-piquelado, facilitando de esta manera la adopción de esta técnica de Producción Más Limpia por parte de los fabricantes de cueros, especialmente curtiembres de escala pequeña y mediana.

  19. ¿Conocemos a los visitantes de Castilla-La Mancha? Un análisis comparativo turistas vs. excursionistas

    Directory of Open Access Journals (Sweden)

    Águeda Esteban Talaya

    2011-01-01

    Full Text Available Uno de los sectores menos perjudicados por la crisis económica ha sido el sector turístico. La calidad de este sector mejora cada año, lo cual está repercutiendo de manera positiva sobre aspectos tales como: experiencia turística, hábitos viajeros y demanda de servicios turísticos por parte de turistas y excursionistas. En este trabajo, a partir del análisis del perfi l sociodemográfi co, la experiencia viajera, los hábitos y el gasto, tratamos de profundizar en el conocimiento de las diferencias y similitudes que surgen entre turistas y excursionistas durante el viaje turístico realizado a Castilla-La Mancha durante 2009. Dicha información permite conocer mejor la demanda turística y adaptar la oferta turística a las necesidades tanto de excursionistas como turistas.

  20. ONDAS SOLITÓNICAS EN INTERFACES ABIÓTICAS-BIÓTICAS BASADAS EN FORMULACIÓN DE DRUDE PARA MEDIOS QUIRALES SOLITONIC WAVES IN BIOTIC-ABIOTIC INTERFACES BASED IN DRUDE FORMULATION FOR CHIRAL MEDIA

    Directory of Open Access Journals (Sweden)

    Rodrigo Cancino L

    2007-04-01

    Full Text Available En este artículo se presenta un modelo teórico y la simulación computacional correspondiente, que permite analizar los efectos de la propagación de ondas solitónicas en medios biológicos esencialmente quirales. La quiralidad se modela, en este caso, bajo la formulación de Drude, mostrándose los rangos de validez del modelo propuesto. Este modelo considera los efectos no lineales y dispersivos del medio, debido a una dependencia espectral de la señal de entrada y la aproximación de campo cuasi-monocromático, para escribir la ecuación no lineal de Schrödinger y resolverla numéricamente mediante el método espectral de Fourier. Los resultados de nuestras simulaciones muestran el efecto de la variación del factor quiral sobre la impedancia del medio y sobre los coeficientes de transmisión y reflexión. Finalmente se discute, brevemente, la generalización del modelo de Drude para el caso de metamateriales.In this paper a theory model with the corresponding simulations, which permit to analyze the solitonic wave propagation in biological media, is presented. The chirality is modeled as Drude's formulation, showing the validity rank of the model. The model considers nonlinear and dispersive effects due to the spectral dependency of the input signal and the cuasy-monocromatic approach, so as to write the Schrödinger non-linear equation and solving it numerically by means of the spectral Fourier method. The numerical results show the effect of chiral factor variation on the media impedance, transmission and reflection coefficients. Finally, the generalization of the Drude's formulation for the metamaterial case, is briefly discussed.

  1. Influência das vogais na estimulabilidade dos sons líquidos Vowels influence in the stimulability for liquid sounds

    Directory of Open Access Journals (Sweden)

    Márcia Mathias de Castro

    2009-01-01

    Full Text Available OBJETIVO: verificar o número de crianças, entre 5:0 e 11:6 anos, com e sem Transtorno Fonológico, falantes do Português Brasileiro que imitaram corretamente os sons líquidos no teste de estimulabilidade considerando cada uma das vogais subsequentes. MÉTODOS: a estimulabilidade foi medida por uma prova de imitação de 63 sílabas com os sons com as sete vogais orais, em três repetições. Foi analisada a porcentagem de sujeitos que produziu corretamente os sons em função da vogal subsequente. RESULTADOS: o foi o som com mais produções corretas, independente da vogal subsequente; o foi melhor produzido com as vogais subsequentes [ε, ó], parecendo ser a altura da língua em posição média-baixa facilitadora da produção desse som; o foi melhor produzido com as vogais subsequentes arredondadas [o, ó, u] evidenciando que o gesto articulatório de arredondamento dos lábios facilita a produção deste som, assim como a posição média-alta e posterior da língua. CONCLUSÃO: as vogais subsequentes aos sons líquidos estudados evidenciam influências em suas produções, de forma a facilitá-las.PURPOSE: to check the number of children, between 5:0 and 11:6-year old, with and without Phonological Disorder, Brazilian Portuguese speaking children that imitated correctly the liquid sounds in the stimulability test considering each one of the subsequent vowels. METHODS: the stimulability was measured in syllable imitation of 63 syllables with the sounds with seven oral vowels. We analyzed the percentage of subjects that produced correctly the sounds as a function of the subsequent vowel. RESULTS: the was the sound with more correct productions, independent of the sequent vowel; the was better produced with the vowels [ε, ó], and it seems that the medium-lower position height of the tongue is make easier the production of this sound; the was better produced with the vowels [o, ó, u], it seems that the round position of the lips

  2. ¿Mejora la calidad de vida de pacientes con EPOC si son tratados por las enfermeras?

    OpenAIRE

    Vega Ramírez, Francisco Antonio; Quero Fuentes, María del Mar

    2015-01-01

    Cartel presentado en la Segunda Conferencia Internacional de Comunicación en Salud, celebrada el 23 de octubre de 2015 en la Universidad Carlos III de Madrid Introducción: la enfermedad pulmonar obstructiva crónica (EPOC), afecta a la calidad de vida (CV) de las personas y origina la necesidad de acciones adicionales de autocuidado. Objetivo: conocer si existe mejora en la calidad de vida en los pacientes con EPOC que son atendidos por enfermeras. Metodología: este estudio se basa en un di...

  3. EFEITO DE ONDAS ULTRA-SÔNICAS SOBRE A POPULAÇÃO DE Leuconostoc mesenteroides EM CALDO DE CANA-DE-AÇÚCAR THE EFFECT OF ULTRASOUND WAVES ON THE Leuconostoc mesenteroides POPULATION IN SUGARCANE JUICE

    Directory of Open Access Journals (Sweden)

    Manoel Soares Soares Júnior

    2007-09-01

    Full Text Available

    No presente trabalho, irradiou-se caldo de cana-de-açúcar de primeira extração, com ondas ultra-sônicas, com o objetivo de controlar a bactéria Leuconostoc mesenteroides. Foi aplicada a metodologia de superfície de resposta (modelo central composto, para avaliar o efeito dos tratamentos. A variável resposta avaliada foi taxa de mortalidade (TM% da população de L. mesenteroides. Os resultados mostraram que a maior taxa de mortalidade, 10,55%, foi obtida com a potência de 50 W, por 225 segundos, em caldo de cana com 18° Brix, pH 4,5 e 45°C.

    PALAVRAS-CHAVE: Indústria açucareira; cana-de-açúcar; ultra-som.

    In the present work, first extraction sugarcane juice was irradiated with ultrasound waves to control Leuconostoc mesenteroides. Surface response methodology (central composite model was used to evaluate the treatment effects. The response variable was the death rate (DR% of the L. mesenteroides population. The results showed that the highest rate of mortality, 10.55%, was obtained with a power of 50 W for 225 seconds, in sugarcane juice with 18° Brix, pH 4.5 and 45°C.

    KEY-WORDS: Sugar industry; sugarcane; ultrasound.

  4. "My Son Is Reliable": Young Drivers' Parents' Optimism and Views on the Norms of Parental Involvement in Youth Driving

    Science.gov (United States)

    Guttman, Nurit

    2013-01-01

    The high crash rates among teenage drivers are of great concern across nations. Parents' involvement is known to help increase their young drivers' driving safety. In particular, parents can place restrictions on their son's/daughter's driving (e.g., restrict night time driving), which can enable the young driver to gain driving experience in…

  5. DETECÇÃO DE INCIDENTES EM UM TÚNEL URBANO CONGESTIONADO: UM ESTUDO DE CASO SOBRE O TÚNEL REBOUÇAS NA CIDADE DO RIO DE JANEIRO

    Directory of Open Access Journals (Sweden)

    Marina Leite de Barros Baltar

    2017-12-01

    Full Text Available O objetivo desta pesquisa foi desenvolver um método teórico que elimine o grande número de alarmes falsos resultantes de paradas por congestionamento nos sistemas de detecção automática de incidentes instalados em túneis urbanos com grande fluxo. Esse método levou em consideração o conceito de ondas de choque com a finalidade de prever o momento que essa onda atingirá um determinado ponto no túnel. Após o desenvolvimento dessa metodologia, foi realizado um estudo de caso no Túnel Rebouças, localizado na Cidade do Rio de Janeiro. Nesse túnel há instalado um sistema de detecção automática de incidente que gera diversos alarmes falsos no horário de pico. Como resultado, observou-se que é possível reduzir a taxa de alarmes falsos a partir da previsão das ondas de choque que atingem as galerias do túnel..

  6. Ondas gravitacionales y objetos compactos

    Science.gov (United States)

    de Araujo, J. C. N.

    It is presented a brief review on gravitational waves (GWs). It is shown how the wave equation is obtained from Einstein's equations and how many and how are the polarization modes of these waves. It is discussed the reasons why GWs sources should be of astrophysical or cosmological origin. Thus, it is discussed what would be the most likely sources of GWs to be detected by the detectors of GWs currently in operation and those that should be operational in the future, emphasizing in particular the sources involving compact objects. The compact objects such as neutron stars, black holes and binary systems involving compact stars can be important sources of GWs. Last but not least, it is discussed the GWs astrophysics that is already possible to do, in particular involving the compact objects. FULL TEXT IN SPANISH

  7. Den onda hjälten

    DEFF Research Database (Denmark)

    Fyhr, Mattias

    2014-01-01

    The chapter discusses the possibilities of comparing ancient and medieval texts on werewolves to contemporary depictions of real serial killers. It is argued that similarities can be found in the depiction of the werewolf as antithesis to civilized society. Finally similarieties between old...

  8. ASPECTOS MORFODINÂMICOS EM PRAIAS DE ENSEADA: ESTUDO DE CASO EM ARMAÇÃO DOS BÚZIOS, BRASIL

    Directory of Open Access Journals (Sweden)

    Eduardo Manuel Rosa Bulhoes

    2016-06-01

    Full Text Available O segmento costeiro selecionado para o estudo sobre dinâmica de praias de enseada foi o cabo Búzios por se tratar de uma protuberância natural da linha de costa composta por praias de variados tamanhos e formas, orientadas e expostas às ondulações dos quadrantes nordeste ao sudoeste. A transformação das ondas em águas rasas expõe ou protege determinados segmentos das enseadas e esta exposição relativa e suas sucessões controlam os processos morfológicos, morfodinâmicos e morfossedimentares atuais, estando aí inclusos a distribuição e o transporte de sedimentos superficiais, as feições da praia e da antepraia e as respostas morfológicas dos perfis praiais frente a alternância de períodos de tempestade e tempo bom. O objetivo geral é diagnosticar os processos governantes da dinâmica costeira em praias de enseada. Os passos metodológicos adotados visaram: (a determinar os principais padrões de circulação e transporte de sedimentos; (b determinar as características morfodinâmicas; (c entender à relação entre a exposição relativa das praias ao ataque das ondas; e (d prognosticar os efeitos morfológicos que podem ser esperados nestes ambientes frente aos processos governantes. Os principais resultados indicam que as inconsistências verificadas entre o padrão de ondas e o registro de transporte de sedimentos podem ser atribuídas a uma condição de tri modalidade da circulação promovida por ondas, que são: (a tempo bom com ventos soprando entre NNE (nor-nordeste e ESE (leste-sudeste; (b tempo bom com marulhos de sul ou de sudeste; (c tempestade com ondas que variam entre su-sudeste (157° até sudoeste (225°. As características morfodinâmicas dos perfis monitorados permitem classifica-los em ambientes de baixa energia e de alta energia que podem ser: (a refletivos de baixa energia; (b intermediários de baixa energia, sujeitos a eventos episódicos de tempestade; (c dissipativos de baixa energia; e (d

  9. Bidirectional Associations Between Externalizing Behavior Problems and Maladaptive Parenting Within Parent-Son Dyads Across Childhood.

    Science.gov (United States)

    Besemer, Sytske; Loeber, Rolf; Hinshaw, Stephen P; Pardini, Dustin A

    2016-10-01

    Coercive parent-child interaction models posit that an escalating cycle of negative, bidirectional interchanges influences the development of boys' externalizing problems and caregivers' maladaptive parenting over time. However, longitudinal studies examining this hypothesis have been unable to rule out the possibility that between-individual factors account for bidirectional associations between child externalizing problems and maladaptive parenting. Using a longitudinal sample of boys (N = 503) repeatedly assessed eight times across 6-month intervals in childhood (in a range between 6 and 13 years), the current study is the first to use novel within-individual change (fixed effects) models to examine whether parents tend to increase their use of maladaptive parenting strategies following an increase in their son's externalizing problems, or vice versa. These bidirectional associations were examined using multiple facets of externalizing problems (i.e., interpersonal callousness, conduct and oppositional defiant problems, hyperactivity/impulsivity) and parenting behaviors (i.e., physical punishment, involvement, parent-child communication). Analyses failed to support the notion that when boys increase their typical level of problem behaviors, their parents show an increase in their typical level of maladaptive parenting across the subsequent 6 month period, and vice versa. Instead, across 6-month intervals, within parent-son dyads, changes in maladaptive parenting and child externalizing problems waxed and waned in concert. Fixed effects models to address the topic of bidirectional relations between parent and child behavior are severely underrepresented. We recommend that other researchers who have found significant bidirectional parent-child associations using rank-order change models reexamine their data to determine whether these findings hold when examining changes within parent-child dyads.

  10. Kinematics of semiclassical spin and spin fiber bundle associated with so(n) Lie-Poisson manifold

    International Nuclear Information System (INIS)

    Deriglazov, A A

    2013-01-01

    We describe geometric construction underlying the Lagrangian actions for non-Grassmann spinning particles proposed in our recent works. If we discard the spatial variables (the case of frozen spin), the problem reduces to formulation of a variational problem for Hamiltonian system on a manifold with so(n) Lie-Poisson bracket. To achieve this, we identify dynamical variables of the problem with coordinates of the base of a properly constructed fiber bundle. In turn, the fiber bundle is embedded as a surface into the phase space equipped with canonical Poisson bracket. This allows us to formulate the variational problem using the standard methods of Dirac theory for constrained systems.

  11. Some modifications of temporal relation in the sentence with the temporal clause

    Directory of Open Access Journals (Sweden)

    Antonić Ivana N.

    2013-01-01

    Full Text Available The subject matter of this paper is the modification of temporal relation in the complex sentence with the temporal clause. At the functional different Serbian language corpus the author notices the next types of modified temporality: excepted locational simultaneity complete or partial, and excepted locationalorientational posteriority formalized by the structure V SAMO/JEDINO/OSIM/SEM/IZUZEV(ONDA KAD VSub, and excepted locational simultaneity/excepted terminativity formalized by the structure V SAMO DOK (Neg VSub; sutuational locational simultaneity complete or partial formalized by the structure V U SITUACIJI / U SLUČAJU KAD VSub, with the posibility to be exceptivly modified in the structure V IZUZEV U SITUACIJI / U SLUČAJU KAD VSub; situational-concessive locational simultaneity complete or partial formalized by the structure V (ČAK I (ONDA KAD VSub; situational-conditional locational-orientational posteriority formalized by the structure V TEK (ONDA KAD VSub, and situational-conditional orientational posteriority formalized by the structure V TEK POŠTO VSub or V TEK NAKON ŠTO VSub and situational-conditional orientational quantified posteriority formalized by the structure V Quant TEK POŠTO VSub, and finaly situational-conditional terminativity formalized by the structure (Neg V SVE DOK Neg VSub. It can ocure sporadically supstitutiv temporality formalized by the structure V DetTemp (UMESTO KAD VSub, and consecutive-adversative temporality formalized by the structure KAD VSub A (ONDA V. [Projekat Ministarstva nauke Republike Srbije, br. 178004: Sintaksička, semantička i pragmatička istraživanja standardnog srpskog jezika

  12. Seismologic study of Los Humeros geothermal field, Puebla, Mexico. Part II: Seismic tomography by attenuation of coda waves (Qc-1) of local earthquakes; Estudio sismologico del campo geotermico de Los Humeros, Puebla, Mexico. Parte II: Tomografia sismica por atenuacion a partir de ondas de coda (Qc-1) de sismos locales

    Energy Technology Data Exchange (ETDEWEB)

    Antayhua, Yanet; Lermo, Javier [Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico, D.F (Mexico); Carlos, Vargas [Departamento de Geociencias, Universidad Nacional de Colombia (Colombia)]. E-mail: jles@pumas.iingen.unam.mx

    2008-07-15

    In the Los Humeros geothermal field, Puebla, seismic tomography has been studied using the attenuation of coda waves (Qc{sup -1}). Ninety-five local earthquakes (Md{<=}3.6) have been used with depths up to 4.0 km registered in the seismic network stations from December 1997 to December 2004. A simple backscattering model was used, filtered in four ranks of frequencies (2, 4, 6, and 8 Hz) and one window of 5 seconds. For the 3D-representation, we used an approximation based on first-order scattering of ellipsoids. The results show that values of Qc for the used frequencies have a frequency dependency shown in the equation: Qc=24{+-}12f{sup 0.86}{+-}{sup 0.06}, where the low values of Qc were observed in the zone of higher seismic and tectonic activity and in the location of injection and production wells. The high values are located in the periphery of the geothermal field. The distribution of the Qc{sup -1} attenuation in 3D and 2D shows the anomalies of high-seismic attenuation are located in the north, south, and southwestern ends of the zone presently under operation, at depths greater than 2.5 km. [Spanish] Para realizar la tomografia sismica por atenuacion de ondas de coda (Qc{sup -1}) en el campo geotermico de Los Humeros, Puebla, se han utilizado 95 sismos locales (Md{<=}3.6) con profundidades hasta 4.0 km, registrados en las estaciones de su red sismica, durante el periodo de diciembre 1997 a diciembre 2004. Se utilizo el modelo de retrodispersion simple, filtrados en cuatro rangos de frecuencias (2, 4, 6, y 8 Hz) y una ventana de 5 segundos. Para la representacion en 3D, se utilizo una aproximacion basada en elipsoides que representan dispersion de primer orden. Los resultados muestran que los valores de Qc para las frecuencias utilizadas tienen una dependencia con la frecuencia de la forma: Qc=24{+-}12f{sup 0.86}{+-}{sup 0.06}, donde los valores bajos de Qc fueron observados en la zona de mayor actividad sismica y en la ubicacion de pozos inyectores y

  13. Parental choice: what parents want in a son-in-law and a daughter-in-law across 67 pre-industrial societies.

    Science.gov (United States)

    Apostolou, Menelaos

    2010-11-01

    Parents are influential over mate choice, and in most human societies they choose spouses for their offspring according to their own preferences. However, surprising little is known about the qualities which make a woman desirable as a daughter-in-law and a man desirable as a son-in-law. Using evidence from 67 societies such traits are identified and three hypotheses are tested: first, the hypothesis is tested that parents desire in an in-law qualities which are beneficial to them and their kin. Second, it is hypothesized that such preferences are contingent upon the sex of the in-law, as traits are weighted differently in a daughter-in-law and in a son-in-law. The third hypothesis tested is that parental preferences vary according to the subsistence type of a given society, as traits are valued differently in agropastoral societies and foraging societies. The evidence presented here provides support for all three hypotheses.

  14. Factores que influyen en la fragmentación de cálculos vesiculares por ondas de choque extracorpóreas Factors influencing on the fragmentation of gallbladder calculi by extracorporeal shock waves

    Directory of Open Access Journals (Sweden)

    Domingo Pérez González

    2004-12-01

    Full Text Available La litotricia por ondas de choque extracorpóreas es una de las variantes terapéuticas para la litiasis vesicular sintomática. Se aplicaron en 626 pacientes 479 (76,6 % del sexo femenino y 147 (23,4 % del masculino, con más de 40 años de edad en 473 (69,9 %. Los índices de fragmentación completa fueron mayores en los pacientes con cálculos únicos (79,5 %, de menos de 20 mm de diámetro (72,3 %, radiotransparentes (89,2 % y con densidades inferiores a las 50 unidades Houndsfield (72,6 %. Necesitaron 2, 3 y 4 sesiones de tratamiento 215 pacientes (34,3 %, 35 (5,6 % y 11 (1,8 % respectivamente. Finalmente la fragmentación fue completa en 332 (53,0 %, parcial en 241 (38,5 % y solo no fragmentaron 53 (8,5 %, donde se demostró el valor de las características físicas e imagenológicas de los cálculos en este procesoExtracorporeal shock-wave lithotripsy is one of the therapeutic variants for symptomatic gallbladder lithiasis. It was applied to 626 patients, 479 (76.6 % females and 147 (23.4 % males. 473 (69.9 % were over 40. The indexes of complete fragmentation were higher in patients with a single calculus (79.5 % of less than 20 mm of diameter (72.3 %·, radiotransparent (89.2% and with densities under 50 Houndsfield units (72.6 %. 215 patients (34.3 %, 35 (5.6 % and 11 (1.8 % needed 2,3 and 4 treatment sessions, respectively. Finally, the fragmentation was complete in 332 (53.0 %, partial in 241 (38.5 % and only 53 (8.5 % were not fragmented. The value of the physical and imaging characteristics of the calculi in this process was demonstrated

  15. Complicity to Hegemonic Masculinity in D.H. Lawrence’s Sons and Lovers

    Directory of Open Access Journals (Sweden)

    Angelina Subrayan

    2016-04-01

    Full Text Available Men have long been associated with dominance, strength and confidence and the issue regarding being compliant to the acceptable masculine ideal has always been part of a culture’s social identity. This study focuses on the critical discussion on masculinity studies in the classic fiction of D.H Lawrence.  Drawing on narrative data from his novel Sons and Lovers (1913, the study examines how hegemonic masculinity is conformed by the male protagonist, Walter Morel, in his gendered relationship. More specifically, the analysis focuses on how the male character aligns himself with the hegemonically authoritarian philosophy of ‘tough’ masculinity. The effects of social practices and socio-historical context in which Lawrence wrote these novels are also examined. The study utilises Connell’s theory of hegemonic masculinity to explicate Lawrence’s depiction of dominant masculinity through his character. The findings reveal that Lawrence aligns his male protagonist to the dominant role by sanctioning aggressiveness, autonomy and violence. Keywords: Hegemonic Masculinity, Dominant Masculinity, Patriarchy, Gender, Power

  16. Were king Stefan the First-Crowned and his son Radoslav co-rulers?

    Directory of Open Access Journals (Sweden)

    Bubalo Đorđe

    2009-01-01

    Full Text Available The Serbian historiography considers the issue of the co-ruling of King Stefan the First-Crowned and his son Radoslav as the one finally resolved. The suggested solution on the co-rule of Stefan and Radoslav may be most succinctly expressed as following: as early as in the year of 1220, due to the frail health of Stefan the First-Crowned and Radoslav's marriage to Anne the Epirus princess, Radoslav was crowned to be the king and positioned to co-rule with his father after the Byzantine model of governing. Nevertheless this point of view has some loose ends. The notion of co-ruling and the very term of 'co-ruler' are quite freely used in the scholarly works. A general consensus on the precise meaning has not been reached yet. At the point where one author perceives a co-rule, the other categorically denies it. Basically the approach equalizing the heir to the throne and the co-ruler is wrong. Although the co-rulers in most cases were the throne heirs, they cannot be called the co-rulers because of the right to inherit the throne, but for the ruling attributes that formally established that right. The conviction of the co-rule of King Stefan and his son Radoslav is founded on the interpretation of the facts coming from the following sources: entitling charters for the monastery of Žiča, produced by Stefan and Radoslav around 1220; some segments from St. Sava's biographies by Domentian and Theodosius describing the circumstances of Stefan's death-bed leaving the throne to Radoslav; the three acts of the town of Kotor from 1221 and 1227 dated by the rule of king Radoslav, the portraits of Stefan and Radoslav next to the entrance to the Church of the Ascension in the monastery of Žiča and in the nartex of the Mileševa monastery church. In the first Žiča charter, Stefan calls Radoslav his heir, while in the second Žiča charter Stefan points out Radoslav as his first-born son blessed by him to be the king of the whole state. (jegože i

  17. Application of the GRAAL model to leaching experiments with SON68 nuclear glass in initially pure water

    International Nuclear Information System (INIS)

    Frugier, P.; Chave, T.; Gin, S.; Lartigue, J.-E.

    2009-01-01

    Based on a review of the current state of knowledge concerning the aqueous alteration of SON68 nuclear glass we have proposed a mechanistic model, GRAAL (Glass Reactivity with Allowance for the Alteration Layer) [P. Frugier, S. Gin, Y. Minet, T. Chave, B. Bonin, N. Godon, J.E. Lartigue, P. Jollivet, A. Ayral, L. De Windt, G. Santarini, J. Nucl. Mater. 380 (2008) 8]. This article describes how the GRAAL model hypotheses are solved using a calculation code coupling chemistry and transport. The geochemical solution of this model combines three major phenomena: chemical equilibria in solution, water and ion transport by convection or diffusion, and element diffusion through the passivating reactive interphase. The model results are compared with experimental data for SON68 glass leached in initially pure water both in a closed system and in renewed media. The comparison shows the model very satisfactorily accounts for variations in the pH and the element concentrations in solution as a function of time, the glass surface area in contact with solution, and the solution renewal rate. This success is due to the fact that the diffusion of elements through the alteration gel is taken into account in the model. This mechanism cannot be disregarded under most experimental conditions - if only to predict the solution pH - and must therefore be an integral part of the geochemical model.

  18. When mothers make sons sexy: maternal effects contribute to the increased sexual attractiveness of extra-pair offspring.

    Science.gov (United States)

    Tschirren, Barbara; Postma, Erik; Rutstein, Alison N; Griffith, Simon C

    2012-03-22

    Quality differences between offspring sired by the social and by an extra-pair partner are usually assumed to have a genetic basis, reflecting genetic benefits of female extra-pair mate choice. In the zebra finch (Taeniopygia guttata), we identified a colour ornament that is under sexual selection and appears to have a heritable basis. Hence, by engaging in extra-pair copulations with highly ornamented males, females could, in theory, obtain genes for increased offspring attractiveness. Indeed, sons sired by extra-pair partners had larger ornaments, seemingly supporting the genetic benefit hypothesis. Yet, when comparing ornament size of the social and extra-pair partners, there was no difference. Hence, the observed differences most likely had an environmental basis, mediated, for example, via differential maternal investment of resources into the eggs fertilized by extra-pair and social partners. Such maternal effects may (at least partly) be mediated by egg size, which we found to be associated with mean ornament expression in sons. Our results are consistent with the idea that maternal effects can shape sexual selection by altering the genotype-phenotype relationship for ornamentation. They also caution against automatically attributing greater offspring attractiveness or viability to an extra-pair mate's superior genetic quality, as without controlling for differential maternal investment we may significantly overestimate the role of genetic benefits in the evolution of extra-pair mating behaviour.

  19. DESARROLLO DE UN SISTEMA DE ENTRENAMIENTO ACÚSTICOVIRTUAL PARA LOCALIZACIÓN DE SONIDOS VIRTUALES PARA PERSONAS INVIDENTES

    OpenAIRE

    Lengua Lengua, Ismael

    2014-01-01

    Una de las fuentes de percepción del sonido en el espacio es el eco, que se produce al impactar una onda sonora, como puede ser la voz, con los objetos que hay alrededor de la fuente sonora, esta interacción permite la localización de objetos en el espacio. En este proyecto de tesis que se pretende desarrollar se van a utilizar distintos parámetros que afectan a la onda sonora, con la finalidad de incrementar el número de ¿puntos sonoros¿ por segundo que una persona invidente es capaz de ...

  20. Projeto de acopladores ópticos utilizando algoritmo genético

    OpenAIRE

    Jaqueline Oliveira Zampronio

    2016-01-01

    Resumo: Este projeto é uma proposta de um novo acoplador óptico para a aplicação em circuitos ópticos integrados. O dispositivo foi desenvolvido utilizando o método dos elementos finitos vetorial 3D associado com o algoritmo genético e leva em consideração guias de onda com diferentes altura, largura e índices de refração. O comprimento total do acoplador óptico é de apenas 4,22 µm e o seu funcionamento é baseado em pequenos segmentos cilíndricos que interferem na propagação da onda eletromag...

  1. Comparative analyses between clinical refraction and automatic refraction obtained through a wave front sensor

    OpenAIRE

    Freitas, Wilson de; Melo Júnior, Luiz Alberto Soares; Schor, Paulo; Campos, Mauro

    2007-01-01

    OBJETIVO: Avaliar e comparar os resultados obtidos da refração estática clínica com a obtida por sensor de frentes de onda. MÉTODOS: Estudo prospectivo, não seqüencial, de 279 olhos de 147 pacientes. Todos os pacientes foram examinados sob cicloplegia. Primeiro realizamos a refração clínica e a seguir a automatizada por sensor de frentes de onda. Os dados refracionais obtidos foram decompostos para análise vetorial. Foram analisados separadamente os dados de um olho por paciente e dos dois ol...

  2. Medida de espessura de filmes finos com interferometro de haidinger

    OpenAIRE

    Elisabeth Andreoli de Oliveira

    1987-01-01

    Resumo: Apresentamos um método não destrutivo para medida de espessura de filmes finos transparentes depositados em substratos transparentes, usando um interferômetro de Haidinger. A partir das frações de interferência, medidas para vários comprimentos de onda, e do índice de refração para um único comprimento de onda, determinamos a espessura do filme e sua dispersão cromática, através de um procedimento analítico-numérico Abstract: We introduce a non-destructive method for the thickness ...

  3. Calibración de un sistema electrónico para la caracterización óptica de diodos emisores de luz

    OpenAIRE

    Vara Lubiano, Mónica

    2017-01-01

    El objetivo de este trabajo es la calibración de un sistema electrónico capaz de automatizar la obtención de espectros de emisión de fuentes de luz. Se trata de obtener una medida de la irradiancia de la fuente, es decir, potencia suministrada por la misma por unidad de superficie y para cada longitud de onda. En primer lugar se calibró la medida de la longitud de onda. Éste proceso consistió en la comparaci ón directa del espectro obtenido por el sistema con el valor conocido ...

  4. “Yo soy del Son a la Salsa”: La re-edición de nuevas expresiones interculturales caribeñas en el espacio cinematográfico

    Directory of Open Access Journals (Sweden)

    Maydi Estrada Bayona

    2014-01-01

    Full Text Available “Yo soy del Son a la Salsa”: La re-edición de nuevasexpresiones interculturales caribeñas en el espacio cinematográfico,es un artículo reflexivo que forma parte dela investigación titulada: Claves Interculturales Caribeñasen la poética cinematográfica de Rigoberto López. El mismoconstituye un acercamiento al tratamiento del temade la diáspora cubana y caribeña en el contexto del Caribeafro-hispánico insular y en Nueva York. El estudio tomacomo antecedente el largometraje de ficción La Últimacena, (1976 de Tomás Gutiérrez Alea y como obra principalel documental: Yo soy del Son a la Salsa, (1996 deRigoberto López, para a través de los aportes de la narrativacinematográfica cubana valorar acerca del impactosociocultural del sujeto migrante en los espacios de acogiday de origen. Ambas obras son referentes en el análisisde estos fenómenos sociales en relación a: su evoluciónen el tiempo, unicidad y diversidad de manifestaciones.Asimismo visualiza la complejidad de las relaciones espacialesabordadas en sus narrativas y explica los nexosentre ellas como obras propiamente. Define la visión interculturale intertextual del documental Yo soy del Son ala Salsa dentro de la estética de la creolización de su creador.Se analiza el lenguaje de la música como expresiónsimbólica de una identidad multicultural caribeña visto, apartir de los géneros musicales del Son y la Salsa, de igualmodo al espacio cinematográfico como revitalizador detradiciones en el Caribe.

  5. AutoCAD 3D pour l'architecture et le design : conception d'une maison et de son mobilier

    CERN Document Server

    Riccio, Michel

    2010-01-01

    Module 3D d'AutoCAD, logiciel leader de dessin assisté par ordinateur, AutoCAD 3D est l'outil indispensable des architectes qui souhaitent présenter leurs travaux en trois dimensions. Voici donc un livre très pédagogique qui leur fera découvrir ses principales fonctionnalités (versions 2006 à 2010) à travers un projet de conception de maison contemporaine. Riche de 700 plans, schémas et dessins, il explique quels outils employer pour modéliser les façades d'une villa, sa piscine et sa terrasse, ainsi que son architecture intérieure et son mobilier. Dès les premières pages, le lecteur se retrouve ainsi plongé dans la pratique, voyant se construire au fil des 17 ateliers un édifice tridimensionnel complexe, qu'il aura la satisfaction d'avoir créé lui-même. A qui s'adresse ce livre ? Aux bureaux d'architectes qui souhaitent présenter leurs projets en 3D ; À tous les étudiants en écoles d'architecture ; Aux utilisateurs 2D d'AutoCAD qui désirent connaître les fonctions 3D de ce logiciel.

  6. L'enquista de literatura orala e son contèxte au sègle XX

    OpenAIRE

    Bouvier, Jean-Claude

    2014-01-01

    Après lei folcloristas dau sègle dètz-e-nòu, lo moviment de recèrca sus la literatura orala es contunhat ò puslèu représ a partir deis annadas 1960, dins de condicions que pòdon èstre dichas mai marridas, mai de tot biais nòvas. Dison generalament que la tradicion orala es avanida, çò qu'es verai en partida per lo conte meravilhós. Mai es verai pasmens que de tròç entiers de literatura orala son restats vius (n'en tornarai parlar dins un moment) e es verai tanben que de fòrmas novas de tradic...

  7. Experiencia en Cuba del tratamiento de la litiasis renoureteral con litotricia extracorpórea por ondas de choque en niños Cuban experience in the treatment of renouretheral lithiasis in children by using extracorporeal shock wave lithotripsy

    Directory of Open Access Journals (Sweden)

    María Victoria Labrada Rodríguez

    2012-06-01

    Full Text Available Introducción: la litiasis urinaria en el niño resulta una enfermedad poco frecuente si se compara con su incidencia en el adulto. Objetivos: describir el resultado del tratamiento en Cuba de la litiasis del aparato urinario en niños, mediante la litotricia extracorpórea por ondas de choque, así como validar la eficacia del método. Métodos: la muestra corresponde a 227 niños, tratados en el Centro de Tratamiento de la Litiasis Urinaria del Hospital Clinicoquirúrgico "Hermanos Ameijeiras'' de La Habana, entre abril de 1986 y octubre de 2011, utilizando 3 tipos de litotritores: el HM3 (Dornier, Lithostar Plus (Siemens y Medical Modulith® SLX (Storz. Resultados: las edades límites fueron 2 y 18 años. De manera general resultó similar el total de pacientes tratados del sexo femenino que el masculino (51 %/49 %. El síntoma predominante fue el cólico nefrítico con cálculos renales (81,9 %, y en el uréter (18,1 %. La superficie media fue de 1,20 cm². Se utilizó anestesia general orotraqueal (34,4 % y general intravenosa (65,6 %. Los retratamientos fueron necesarios en 8 casos (3,52 %. Las complicaciones fueron la infección urinaria aguda (3,08 % y el hematoma subcapsular renal (0,88 %. Resultó libre de material litiásico el 96,04 %. Conclusiones: la terapéutica mediante la litotricia extracorpórea por ondas de choque resulta efectiva, con baja tasa de morbilidad y de complicaciones graves, por lo que creemos debe defenderse científicamente como la primera opción terapéutica en la resolución de la litiasis urinaria en estas edades. Debe recordarse que eliminar el cálculo no es suficiente, hay que identificar la enfermedad, su tratamiento de fondo, y evitar las recidivas.Introduction: urinary lithiasis is a rare disease in children if compared with its incidence on the adults. Objectives: to describe the results of the treatment of urinary lithiasis in children in Cuba, by using extracorporeal shock wave lithrotripsy, and to

  8. Egeria, la Dama Peregrina

    Directory of Open Access Journals (Sweden)

    Pascual, Carlos

    2005-04-01

    Full Text Available En los últimos años del siglo IV, cuando el imperio romano está a punto de derrumbarse, una mujer hispana de alta alcurnia se pone en camino para conocer y venerar los Santos Lugares, recién «descubiertos» por santa Helena. Atravesando la «Vía Domitia» llega a la capital de la pars orientis del Imperio, Constantinopla, continúa hasta Jerusalén, recorre parajes bíblicos, incluido el Sinai y algunos lugares de Mesopotamia. Va narrando cuanto ve, con deliciosa frescura, en unas cartas dirigidas a las amigas que quedaron en la patria. Su relato, copiado por algún monje en el siglo XI, fue hallado en 1884 en una biblioteca italiana. Tras una investigación prolongada, se pudo poner nombre y rostro a esta matrona piadosa. Egeria, la primera viajera-escritora española de que tengamos noticia.…

  9. Evaluación de anemia ferropénica en la primera infancia del Municipio de Sonsón-Antioquia, 2007

    Directory of Open Access Journals (Sweden)

    Tulia Isabel Castillo Salgado

    2014-12-01

    Full Text Available Objetivo: Determinar la prevalencia de anemia por deficiencia de hierro en niños de la primera infancia del municipio de Sonsón – Antioquia, en el año 2007. Metodología: Se realizó un estudio descriptivo transversal en 391 niños de 0 a 84 meses de edad del Municipio de Sonsón, Antioquia. Se estudiaron los parámetros de hemoglobina y ferritina sérica utilizando puntos de corte de la Organización Mundial de la Salud (OMS. Se calcularon las medidas de frecuencia y de resumen y los intervalos de confianza para proporciones y las pruebas de estadística paramétrica y no paramétrica. Resultados: La prevalencia de anemia ferropénica fue de 4,3% y la media de ferritina sérica y de hemoglobina para la población del estudio fue de 29,9 ng/mL y 12,6 g/dL respectivamente. Adicionalmente se halló significancia estadística de la prevalencia de anemia ferropénica por grupo de edad (p<0,0001; pero no se encontró significancia estadística de la  prevalencia de anemia con el sexo (p= 1,0000.  Conclusión: La prevalencia de anemia ferropénica en los niños de la primera infancia del Municipio de Sonsón fue baja de acuerdo con los parámetros de hemoglobina y ferritina sérica establecidos por la OMS, hay variación de la anemia ferropénica por grupo de edad pero no por sexo.

  10. COMPARACIÓN DE LA ACTIVIDAD ELÉCTRICA CEREBRAL ENTRE PACIENTES BRUXÓMANOS Y GRUPO CONTROL

    Directory of Open Access Journals (Sweden)

    Beatriz Cepeda de Romero

    2012-09-01

    Full Text Available Introducción: La etiología del bruxismo es controvertida, aunque se asocia con un origen central debido al incremento de la excitabilidad nerviosa. Objetivo: Comparar la frecuencia de los ritmos alfa, beta y la descarga de ondas lentas entre un grupo de bruxómanos y un grupo control mediante el electroencefalograma. Método: Estudio clínico, analítico, controlado. La evaluación odontológica (2007-2009 permitió seleccionar veinte pacientes con bruxismo y veinte sanos (o no bruxómanos. A todos los individuos de la muestra se les hizo evaluación médica y electroencefalográfica para medición de frecuencia y amplitud de los ritmos alfa y beta, en reposo mental y físico y durante la fotoestimulación e hiperventilación por tres minutos. Las pruebas estadísticas utilizadas fueron pruebas F, T de Student homocedástica o heterocedástica y X2 de Pearsons, con determinación de riesgo relativo indirecto y estimación de intervalo de confianza de 95%. Resultados. La frecuencia basal del ritmo alfa fue significativamente mayor en el grupo de bruxómanos que en el grupo control (p=8.6×10-6. Igual efecto se vio en el ritmo beta (p=2.7×10-12. La hiperventilación desencadenó en dieciocho pacientes bruxómanos (90% descargas de ondas lentas comparado con sólo cinco individuos del grupo control (25% con una diferencia altamente significativa según la prueba estadística de Pearsons (p=3.21×10-5. En este caso, el riesgo relativo indirecto según la prueba X2 fue de 27.00 (IC 95%: 4.57-159.66. Discusión: La actividad cerebral es significativamente mayor en el grupo de pacientes con bruxismo que en el grupo control. Las descargas anormales de ondas lentas se presentan con frecuencia significativamente mayor en el grupo caso que en el grupo control. Los informes de estrés, insomnio de permanencia y dificultad para concentrarse son significativamente mayores en el grupo caso que en el grupo control. Las alteraciones en la excitabilidad de los

  11. Potencial evocado auditivo de tronco encefálico por frequência específica por via aérea e via óssea em neonatos ouvintes normais

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    Natália Ramos

    2014-06-01

    Full Text Available Objetivo determinar os níveis mínimos de resposta (NMR e a latência da onda V do Potencial Evocado Auditivo de Tronco encefálico por Frequência específica (PEATE-FE em neonatos ouvintes normais nas frequências de 0.5, 1, 2 e 4 kHz por via aérea e via óssea e determinar valores normativos. Métodos foram avaliados neonatos com audição normal, sendo realizado o PEATE-FE nas frequências de 0.5, 1, 2 e 4 kHz, tanto por via aérea (VA quanto por via óssea (VO. Para cada frequência, foram avaliadas 12 orelhas em um total de 18 neonatos. A análise dos resultados avaliou o tempo de latência e a presença da onda V até a intensidade de 20 dBnNA para quatro intensidades e para os dois tipos de condução (aérea e óssea. Resultados observou-se aumento da latência da onda V com a diminuição da intensidade e maiores latências nas frequências mais baixas, tanto na VA quanto na VO. Porém, em fortes intensidades, em ambas condições, não houve diferença entre as latências de 0.5 e 1 kHz, contrariando os achados da literatura. Para VA, na frequência de 500 Hz, houve presença da onda V até 30 dBnNA em todas as orelhas, e em 1000 Hz, 11 orelhas (91,66 % apresentaram resposta em 20 dBnNA; nas demais frequências, 100% das orelhas avaliadas apresentaram resposta em 20 dBnNA. Na VO, a presença da onda V em 20 dBnNA foi observada em todas as frequências estudadas. Conclusão os valores descritos podem ser considerados normativos e utilizados na clinica como padrão de normalidade, auxiliando no diagnóstico diferencial da perda auditiva ao nascimento.

  12. Condições Morfodinâmicas Associadas a Afogamentos. Contribuição à Segurança nas Praias Oceânicas da Cidade do Rio de Janeiro / Morphodynamic Conditions Related to Drowning Victims.Contribution to Beach Safety on Rio de Janeiro’s Oceanic Beaches

    Directory of Open Access Journals (Sweden)

    Eduardo Manuel Rosa Bulhões

    2010-04-01

    Full Text Available Nas praias oceânicas da cidade do Rio de Janeiro, o número de resgates realizados por ano é da ordem de milhares. Este estudo visa identificar condições críticas à segurança dos banhistas nas praias oceânicas da cidade, através da elaboração de estudos em clima de ondas, propagação de ondas em águas rasas e condições morfodinâmicas nas praias que podem se apresentar como perigosas à integridade dos milhares de banhistas freqüentadores das praias cariocas. Os perigos relacionados são a arrebentação das ondas, a topografia móvel do leito praial e a formação de correntes longitudinais e de retorno na zona de surfe. Esses processos naturais são resultado da interação física entre a hidrodinâmica marinha próxima à costa e o relativo reposicionamento do fundo arenoso nas praias que, de fato, expõe banhistas ao risco de afogamentos. A hipótese testada é a de que a partir de estudos em clima de ondas, são identificadas condições médias de ondulação que ao se propagarem até as praias, geram condições morfodinâmicas diferenciadas até mesmo ao longo de um mesmo arco praial. Por sua vez, os estágios morfodinâmicos podem apresentar características perigosas aos banhistas. A análise das estatísticas de salvamentos permite identificar segmentos nas praias onde há maior ou menor concentração de banhistas em situação de risco. Como resultado, chegou-se a um guia de avaliação de risco nas praias, através da correlação entre altura de ondas, nível da maré e estágios morfodinâmicos, que, em último caso, define os qualitativos das praias que expõe os banhistas a riscos.

  13. On the stability of atmospheric waves with low waves numbers

    Energy Technology Data Exchange (ETDEWEB)

    Wiin-Nielsen, A [The Royal Danish Academy of Sciences and Letters, Copenhagen (Denmark)

    2001-01-01

    The stability of atmospheric waves with low wave numbers is investigated using a quasi-geostrophic model of the second kind. Such a model is base on the thermodynamic equation, the continuity equation and a rigorous use of the geostrophic relations. The boundary conditions at the surface of the earth is formulated in two ways. The effects of a boundary condition at 1000 hpa, where the vertical p-velocity is zero, is compared with the effects of a second condition, where w is zero. The two boundary conditions are used to determine the stability of the low wave number waves. The second condition introduces waves with large positive and negative phase velocities, especially in the low latitudes, but has also an influence on the stability of these waves. The main result of the comparative investigation is that the more correct boundary condition in general will produce stronger instabilities than the simpler boundary condition. The e-folding times obtained with the more general model is in closer agreement with the results obtained by observational studies. [Spanish] Se investiga la estabilidad de las ondas atmosfericas con numero bajo de ondas, mediante un modelo quasi-geostrofico de segunda clase. Tal modelo esta basado en la ecuacion termodinamica, la de continuidad y un empleo riguroso de las relaciones geostroficas. La condicion de frontera en la superficie terrestre se formula de dos maneras. Los efectos de una condicion fronteriza a los 1000 hPa, donde la velocidad vertical P es nula, se comparan con los efectos de una segunda condicion, donde W es cero. Las dos condiciones fronterizas se usan para determinar la estabilidad de las ondas de numero bajo. La segunda condicion introduce ondas grandes, tanto con velocidades de fase positivas como negativas, especialmente en las bajas latitudes, pero tiene tambien una influencia sobre la estabilidad de estas ondas. El resultado principal de la investigacion comparativa es que entre mas realista es la condicion de

  14. The Phenomenology of Trauma. Sound and Haptic Sensuality in Son of Saul

    Directory of Open Access Journals (Sweden)

    Vincze Teréz

    2016-12-01

    Full Text Available The winner of many prestigious prizes (Oscar for the best foreign language film, Grand Prize of the Cannes Film Festival, and the Golden Globe among them, the Hungarian film, Son of Saul – according to most critics – represents the Holocaust trauma in a completely new and intriguing way. The filmmakers have invented a special form in order to tackle the heroic task of showing the unwatchable, representing the unthinkable. In this essay I analyse the representational strategy of the film from a phenomenological point of view, and position it in the theoretical framework of haptic sensuality formulated by Vivian Sobchack and Laura U. Marks, among others. I mainly focus on the use of sound, in particular the role of sound design in the creation of haptic space. With the help of the analysis of the representation and artistic invocation of the different bodily senses in the film, I demonstrate how traditional artistic formal elements (characteristic of highly artistic, even experimental productions are combined with high impact effects often present in popular film forms. I argue that the successful combination of these two factors makes the film an example of artistic immersive cinema.1

  15. Meta-analysis suggests choosy females get sexy sons more than "good genes".

    Science.gov (United States)

    Prokop, Zofia M; Michalczyk, Łukasz; Drobniak, Szymon M; Herdegen, Magdalena; Radwan, Jacek

    2012-09-01

    Female preferences for specific male phenotypes have been documented across a wide range of animal taxa, including numerous species where males contribute only gametes to offspring production. Yet, selective pressures maintaining such preferences are among the major unknowns of evolutionary biology. Theoretical studies suggest that preferences can evolve if they confer genetic benefits in terms of increased attractiveness of sons ("Fisherian" models) or overall fitness of offspring ("good genes" models). These two types of models predict, respectively, that male attractiveness is heritable and genetically correlated with fitness. In this meta-analysis, we draw general conclusions from over two decades worth of empirical studies testing these predictions (90 studies on 55 species in total). We found evidence for heritability of male attractiveness. However, attractiveness showed no association with traits directly associated with fitness (life-history traits). Interestingly, it did show a positive correlation with physiological traits, which include immunocompetence and condition. In conclusion, our results support "Fisherian" models of preference evolution, while providing equivocal evidence for "good genes." We pinpoint research directions that should stimulate progress in our understanding of the evolution of female choice. © 2012 The Author(s). Evolution© 2012 The Society for the Study of Evolution.

  16. Analysis of water availability from Son Real and Binicaubell torrents (Mallorca-Spain) for use in the artificial recharge of the La Marineta aquifer; Analisis de las disponibilidades hidricas de los torrentes de Son Real y Binicaubell (Mallorca-Espana) para su utilizacion en la recarga artificial del acuifero de la Marineta

    Energy Technology Data Exchange (ETDEWEB)

    Murillo, J. M.; Orden, J. A. de la; Gavilan, C. J.

    2009-07-01

    The history of artificial recharge of groundwater in Majorca island is explained in this paper. Too, a brief description of the only experience now working is shown, and an overview of the proposal of the Hydrogeological Plan of the Demarcation of Baleares for the regulation of runoff by means of the artificial recharge of aquifers is presented. This should include Son Real and Binicaubell torrents; so, an assessment of their water surpluses to determine water availability for artificial recharge is analyzed. The methodology used is based on a climatic analysis in the studied basins, as well as on the Son Real y Binicaubell torrents water inflow.Water naturally infiltrated through these torrents' beds and surpluses flowing to the sea are also quantified. The statistical analysis involves methods such as autocorrelation. (Author) 20 refs.

  17. Alteraciones oculares y visuales en personas que trabajan con ordenador y son usuarias de lentes de contacto: una revisión bibliográfica

    Directory of Open Access Journals (Sweden)

    Ana Tauste Francés

    2014-01-01

    Full Text Available Fundamentos: El elevado número de personas que trabajando con ordenador utiliza lentes de contacto plantea la cuestión sobre si la suma de estos dos factores de riesgo para la salud visual puede originar un agravamiento del Síndrome Visual Informático. El objetivo de esta revisión es sintetizar el conocimiento científico sobre las alteraciones oculares y visuales relacionadas con la exposición a ordenador en usuarios de lentes de contacto. Métodos: Revisión de artículos científicos (2003-2013 en español e inglés, realizando una búsqueda bibliográfica, en Medline a través de PubMed y en Scopus. Resultados: La búsqueda inicial aportó 114 trabajos, después de aplicar criterios de inclusión/exclusión se incluyeron seis artículos. Todos ellos ponen de manifiesto que las alteraciones al utilizar el ordenador son más frecuentes en las personas usuarias de lentes de contacto, con prevalencias que oscilan de 95,0% al 16,9% que en las que no utilizan lentes de contacto, cuya prevalencia va del 57,5% al 9,9% y con una probabilidad cuatro veces mayor de padecer ojo seco [OR: 4,07 (IC 95%: 3,52-4,71]. Conclusiones: Las personas usuarias de ordenador padecen más alteraciones oculares y visuales cuando además son usuarias de lentes de contacto, pero los estudios son escasos y poco contundentes. Se precisan nuevas investigaciones que analicen la influencia según los tipos de lentes y sus condiciones de uso, tanto en la sintomatología como en la calidad de la lágrima y la superficie ocular. Las lentes de hidrogel de silicona son las que se asocian a mayor confort.

  18. Indicadores regionales de desarrollo sustentable en Chile: ¿Hasta qué punto son útiles y necesarios?

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    Hernán Blanco

    2001-09-01

    Full Text Available Cada vez más necesitamos maneras de asegurar patrones de desarrollo que sean sustentables, es decir, que sean ambiental, social y económicamente apropiados para nosotros y para las generaciones venideras. Los indicadores de desarrollo sustentable son una herramienta promisoria que permitiría "aterrizar" el concepto de sustentabilidad, apoyando la manera en que se toman las decisiones. En Chile existen pocas experiencias sobre el tema. Este artículo presenta el trabajo realizado para desarrollar indicadores de desarrollo sustentable en cuatro regiones del país. El artículo se centra en las lecciones que han surgido de la experiencia

  19. Reparto de utilidades en las sociedades cooperativas de ahorro y préstamo ¿por qué son gravadas? un análisis sobre la aplicación de la carga fiscal

    OpenAIRE

    Ramos Andrade, Zahyra del Rocío

    2015-01-01

    En síntesis en la presente investigación se realizó un minucioso análisis en torno a las sociedades cooperativas de ahorro y préstamo, basándose la autora en una entidad denominada caja popular San Rafael. Llegando a la conclusión de que dichas empresas son personas morales lucrativas pues obtienen un beneficio económico a cambio de los servicios que presta, son generadoras de riqueza y obtienen utilidades; sin embargo, dichas utilidades no son gravadas debido a que la legislación determina q...

  20. Levitação acústica

    OpenAIRE

    Andrade, Marco Aurélio Brizzotti; Pérez, Nicolás; Adamowski, Julio Cezar

    2015-01-01

    A levitação acústica pode ser uma ferramenta valiosa para auxiliar estudantes de graduação a aprender conceitos básicos de física, tais como movimento harmônico simples, ondas acústicas estacionárias, e energia potencial. Neste artigo, apresentamos o princípio de funcionamento de um levitador acústico e explicamos como aplicar as equações básicas da acústica para determinar a força de radiação acústica que atua numa esfera em uma onda estacionária. Acoustic levitation can be a valuable too...

  1. Expression of multiple sexual signals by fathers and sons in the East-Mediterranean barn swallow: are advertising strategies heritable?

    Science.gov (United States)

    Vortman, Yoni; Safran, Rebecca J; Reiner Brodetzki, Tali; Dor, Roi; Lotem, Arnon

    2015-01-01

    The level of expression of sexually selected traits is generally determined by genes, environment and their interaction. In species that use multiple sexual signals which may be costly to produce, investing in the expression of one sexual signal may limit the expression of the other, favoring the evolution of a strategy for resource allocation among signals. As a result, even when the expression of sexual signals is condition dependent, the relative level of expression of each signal may be heritable. We tested this hypothesis in the East-Mediterranean barn swallow (Hirundo rustica transitiva), in which males have been shown to express two uncorrelated sexual signals: red-brown ventral coloration, and long tail streamers. We show that variation in both signals may partially be explained by age, as well as by paternal origin (genetic father-son regressions), but that the strongest similarity between fathers and sons is the relative allocation towards one trait or the other (relative expression index), rather than the expression of the traits themselves. These results suggest that the expression of one signal is not independent of the other, and that genetic strategies for resource allocation among sexual signals may be selected for during the evolution of multiple sexual signals.

  2. Velocidad de la onda de pulso y la excreción urinaria de albumina en pacientes hipertensos tratados con Perindopril

    Directory of Open Access Journals (Sweden)

    J. E. Tobilli

    2002-12-01

    Full Text Available La presión arterial sistólica, la presión arterial diastólica y la excreción urinaria de albúmina (EUA han sido reconocidas como predictores de riesgo cardiovascular. Además, los trastornos de la compliance arterial (CA evaluados mediante la velocidad de la onda de pulso elevada (VOP están estrechamente relacionados con los cambios de la presión arterial y correlacionados con la mortalidad cardiovascular y la presencia de ateroesclerosis. El objetivo primario de este estudio ha sido determinar la relación entre la VOP y la EUA en un grupo de pacientes no fumadores con hipertensión esencial y secundariamente evaluar los cambios producidos por un inhibidor de la enzima convertidora de angiotensina (perindopril sobre estas dos variables. En el estudio participaron setenta pacientes (33 hombres y 37 mujeres hipertensos no fumadores, sin tratamiento previo, de 50 ± 7 años (entre 35-69. La VOP de todos los pacientes fue estudiada por medio de un dispositivo computarizado (Complior en el período basal y a los seis meses de tratamiento con perindopril. También se determinó la EUA por el método de inmunodifusión radial al inicio del tratamiento y luego de seis meses de tratamiento con perindopril (4.6 ± 1.4 mg/día. Al finalizar el estudio se observó una reducción significativa de la presión arterial sistólica (PAS (160.2 ± 10.6 vs. 131.9 ± 7.1 mmHg, p<0.01, presión arterial diastólica (PAD (100.6 ± 5 vs. 81.6 ± 4.8 mmHg, p<0.01, VOP (13.4 ± 1 vs. 9.1 ± 0.9 m/seg, p<0.01 y EUA (42.2 ± 19.3 vs.11.1 ± 3.6 mg/día, p<0.01 al comparar estos valores con los del período basal. Por otra parte, la función renal evaluada por clearance de creatinina mostró una significativa mejoría en relación a los valores iniciales (87.5 ± 22.5 vs. 102.1 ± 23.5 ml/min, p<0.01. Asimismo, se apreció una significativa correlación positiva entre la EUA y la VOP al inicio del estudio (r = 0.81; p<0.01 y después de seis meses de tratamiento

  3. Activation and transfer of sulfate in biological systems (1960); Activation biologique du sulfate et son transfert (1960)

    Energy Technology Data Exchange (ETDEWEB)

    Chapeville, F [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

    1960-07-01

    It examines in this review the successive stages of active sulfate formation and its role in biological synthesis of sulfuric esters. The possible role of active sulfate as intermediary in sulfate reduction is also discussed. (author) [French] On examine dans cette etude les stades successifs de la mise en evidence du sulfate actif, son role dans la formation des esters sulfuriques de natures diverses, ainsi que sa participation eventuelle comme intermediaire au cours de la reduction du sulfate. On decrit aussi un procede de preparation du systeme biologique, generateur du sulfate actif et une methode de synthese chimique. (auteur)

  4. MODELLING AND RECONSTRUCTION OF GABOR-TYPE HOLOGRAMS

    Directory of Open Access Journals (Sweden)

    GABRIEL J. LORA

    2011-01-01

    Full Text Available Los procesos de modelación y reconstrucción de hologramas se soportan en el cálculo de la integral de difracción en su formulación de kirchhoff-fresnel o rayleight-sommerfeld. Dicha integral puede ser evaluada numéricamente por medio de diferentes formalismos: teorema de convolución, espectro angular y transformada de fresnel, entre otras. En este trabajo se presenta la modelación de hologramas en línea tipo gabor de partículas opacas de diferentes diámetros. Estos hologramas son reconstruidos por el cálculo numérico de la difracción que sufre una onda esférica cuando ilumina el holograma. El proceso de modelación reconstrucción se utiliza para estudiar el desempeño de la microscopia holográfi ca digital en línea en función del cambio en la concentración de monocapas mono-dispersadas de esferas opacas.

  5. DETERMINACIÓN DE CALCIO, HIERRO Y FÓSFORO EN UN PRODUCTO FERMENTADO DE SOJA OBTENIDO POR ULTRAFILTRACIÓN

    Directory of Open Access Journals (Sweden)

    Ana N. Rinaldoni

    2011-01-01

    Full Text Available El objetivo de este trabajo fue obtener un producto fermentado de soja a partir de un concentrado de leche de soja, empleando la ultrafiltración para alcanzar el contenido de sólidos totales requerido para la producción de yogur (12-14% p/p. Además, se propuso evaluar el empleo de la Fluorescencia de rayos X como técnica para cuantificar el contenido de Ca, Fe y P y su distribución final por el proceso ensayado. Las determinaciones analíticas se realizaron sobre la leche de soja, concentrado, permeado y producto fermentado, empleando fluorescencia de rayos X dispersiva en longitud de onda (WDXRF. Los resultados mostraron que estos elementos son concentrados por la membrana a través de asociaciones con las proteínas, conservando el aporte de minerales del producto. Además, se demostró que la herramienta analítica empleada permite una determinación directa sobre las muestras, evitando el pre-tratamiento requerido por otras técnicas convencionales.

  6. Binding of the Ras activator son of sevenless to insulin receptor substrate-1 signaling complexes.

    Science.gov (United States)

    Baltensperger, K; Kozma, L M; Cherniack, A D; Klarlund, J K; Chawla, A; Banerjee, U; Czech, M P

    1993-06-25

    Signal transmission by insulin involves tyrosine phosphorylation of a major insulin receptor substrate (IRS-1) and exchange of Ras-bound guanosine diphosphate for guanosine triphosphate. Proteins containing Src homology 2 and 3 (SH2 and SH3) domains, such as the p85 regulatory subunit of phosphatidylinositol-3 kinase and growth factor receptor-bound protein 2 (GRB2), bind tyrosine phosphate sites on IRS-1 through their SH2 regions. Such complexes in COS cells were found to contain the heterologously expressed putative guanine nucleotide exchange factor encoded by the Drosophila son of sevenless gene (dSos). Thus, GRB2, p85, or other proteins with SH2-SH3 adapter sequences may link Sos proteins to IRS-1 signaling complexes as part of the mechanism by which insulin activates Ras.

  7. A novel mutation (C1425Y) in the FBN2 gene in a father and son with congenital contractural arachnodactyly.

    Science.gov (United States)

    Chen, Ying; Lei, Yun-Ping; Zheng, Hong-Xiang; Wang, Wei; Cheng, Hong-Bo; Zhang, Jing; Wang, Hong-Yan; Jin, Li; Li, Hong

    2009-06-01

    Congenital contractural arachnodactyly (Beals syndrome) is a rare autosomal dominantly inherited connective tissue disorder characterized by flexion contractures, arachnodactyly, crumpled ears, and mild muscular hypoplasia. Here, a father and son with congenital contractural arachnodactyly features were identified. After sequencing 15 exons (22 to 36) of the FBN2 gene, a novel mutation (C1425Y) was found in exon 33. This de novo mutation presented first in the father and was transmitted to his son, but not in the other 14 unaffected family members and 365 normal people. The C1425Y mutation occurs at the 19th cbEGF domain. Cysteines in this cbEGF domain are rather conserved in species, from human down to ascidian. The cbEGF12-13 in human FBN1 was employed as the template to perform homology modeling of cbEGF18-19 of human FBN2 protein. The mutation has also been evaluated by further prediction tools, for example, SIFT, Blosum62, biochemical Yu's matrice, and UMD-Predictor tool. In all analysis, the mutation is predicted to be pathogenic. Thus, the structure destabilization by C1425Y might be the cause of the disorder.

  8. Introducing SONS, a tool for operational taxonomic unit-based comparisons of microbial community memberships and structures.

    Science.gov (United States)

    Schloss, Patrick D; Handelsman, Jo

    2006-10-01

    The recent advent of tools enabling statistical inferences to be drawn from comparisons of microbial communities has enabled the focus of microbial ecology to move from characterizing biodiversity to describing the distribution of that biodiversity. Although statistical tools have been developed to compare community structures across a phylogenetic tree, we lack tools to compare the memberships and structures of two communities at a particular operational taxonomic unit (OTU) definition. Furthermore, current tests of community structure do not indicate the similarity of the communities but only report the probability of a statistical hypothesis. Here we present a computer program, SONS, which implements nonparametric estimators for the fraction and richness of OTUs shared between two communities.

  9. ‘Unkind and cruel, to deceive your Son | In borrow’d Shapes, and his Embrace to shun’: Mother-son love in T. S. Eliot’s ‘La Figlia Che Piange’

    Directory of Open Access Journals (Sweden)

    Matthew Geary

    2015-01-01

    Full Text Available T. S. Eliot's "La Figlia Che Piange" (1916 is a curious anomaly in his early works. It stands out as a love poem of outstanding grace portraying a more positive relationship to the feminine compared to other poems contemporaneous with its writing such as "The Love Song of St. Sebastian" (1914 and "Hysteria" (1915. This essay shows the import of Eliot's chosen epigraph for "La Figlia" taken from Virgil's Aeneid to have been largely neglected or misread by critics. As a consequence, it argues that critical readings have crucially missed the presence of a shrouded maternal aspect within the poem. Through the lens of Lacanian psychoanalysis and the work of adherents to Lacanian theory — such as Bruce Fink, Shoshana Felman and Slavoj Zizek — this paper newly argues that the poem's meditation on the issues of union and separation between two lovers is in fact a screen for deeper unconscious ambivalent feelings between mother and son. That is to say, Eliot's "La Figlia Che Piange" shows a failed attempt to reconstruct, traverse and separate from the "fundamental fantasy" unconsciously orientating the male speaker of the poem and his desire.

  10. Efeito agudo da crioterapia e diatermia na flexibilidade e força muscular de isquiotibiais = Acute effect of cryotherapy and diathermy in the hamstring flexibility and muscle strength

    Directory of Open Access Journals (Sweden)

    Dohnert, Marcelo Baptista

    2017-01-01

    Full Text Available Objetivo: Verificar o efeito agudo da crioterapia e da diatermia por ondas curtas na flexibilidade e força muscular de isquiotibiais de adultas jovens. Materiais e Métodos: Quarenta e cinco voluntárias foram randomizadas em grupo controle, grupo crioterapia e grupo diatermia por ondas curtas. Os sujeitos foram submetidos a uma única aplicação de crioterapia ou diatermia por ondas curtas. Foram avaliadas, pré e pós intervenção, a flexibilidade através do banco de Wells e do ângulo de extensão ativa do joelho, e a força muscular através da dinamometria. As variáveis foram analisadas por meio do teste t de Student e ANOVA. Resultados: Verificou-se um aumento significativo da flexibilidade dos isquiotibiais, tanto através do banco de Wells (24,50±6,88 cm para 26,87±8,02 cm (p=0,002, quanto na extensão ativa do joelho (162,60±7,76 graus para 165,53 ± 6,38 graus (p=0,015 no grupo diatermia. O grupo crioterapia mostrou melhora da flexibilidade no banco de Wells (23,27±6,33 cm para 25,53±6,13 cm (p=0,002. Não ocorreu aumento significativo da força muscular em nenhum dos grupos de intervenção. Não foi verificada diferença entre os grupos do estudo. Conclusão: Tanto a diatermia quanto a crioterapia melhoraram, de forma aguda, a flexibilidade dos isquiotibiais em mulheres adultas jovens e saudáveis. A termoterapia através da diatermia por ondas curtas mostrou-se mais efetiva nessa melhora. Ambos os recursos não alteraram a força muscular produzida pelos isquiotibiais

  11. DINÂMICA GEOMORFOLÓGICA DA COSTA ROCHOSA DO ESTADO DO RIO DE JANEIRO

    Directory of Open Access Journals (Sweden)

    Antonio Paulo Faria

    2018-01-01

    Full Text Available Este trabalho sugere a classificação de seis tipos de costão marinho, sete tipos de falésia, bancada e três formas de campo de blocos costeiro, de acordo com as características da geomorfologia costeira brasileira. Aponta ainda para os problemas que podem ocorrer com a ocupação e uso das faixas de lavagem das ondas, que constituem áreas de risco. A maior parte do litoral do Estado do Rio de Janeiro é formada por costões, cuja inclinação é classificada neste trabalho entre 15° e 45°. Acima deste limite é considerado falésia. Existem ainda extensos depósitos de blocos produzindo situações antagônicas: muitos foram originados por eventos catastróficos, mas posteriormente passaram a promover certa proteção à costa, por formar barreiras que dissipam a energia das ondas. Em geral, os costões marinhos nas áreas expostas às ondas de tempestades possuem inclinação média de 30° e comprimento médio de 50m. A extensão aumenta à medida que a inclinação da encosta diminui porque as ondas alcançam áreas mais distantes. Nas áreas semi expostas e protegidas, os comprimentos diminuem. No Estado foram identificadas 13 regiões costeiras distintas, entretanto, da divisa Oeste até a Ilha da Marambaia são comuns depósitos de blocos; nos municípios do Rio de Janeiro e Niterói predominam costões marinhos; entre Arraial do Cabo e Búzios, prevalecem falésias cristalinas; e entre Rio das Ostras e Macaé, o perfil do tipo bancada é o mais comum.

  12. Efetividade do treinamento auditivo na plasticidade do sistema auditivo central: relato de caso

    Directory of Open Access Journals (Sweden)

    Tatiana Rocha Silva

    2014-08-01

    Full Text Available O objetivo do estudo foi descrever, por meio de relato de caso, a efetividade do treinamento auditivo na modificação do sistema auditivo central de uma criança com queixas de alteração de fala e linguagem. Trata-se de um estudo retrospectivo, por meio de relato de caso, de uma criança do gênero masculino de 02 anos e 06 meses com queixas de alteração de fala e/ou linguagem. Na avaliação de potencial evocado auditivo de tronco encefálico observou-se presença de ondas eletrofisiológicas I, III e V com latência absoluta e intervalos interpicos dentro da normalidade na orelha direita e presença de ondas I, III e V com latência absoluta da onda V elevada e intervalos interpicos III-V e I-V elevados na orelha esquerda. O limiar eletrofisiológico foi de 70dBNA à direita e 40dBNA à esquerda. Após a avaliação a criança foi encaminhada para terapia fonoaudiológica baseada no treinamento auditivo informal. Para monitorar a função auditiva, após 06 meses de terapia fonoaudiológica, a criança foi encaminhada para reavaliação auditiva. Na reavaliação auditiva os resultados foram presença de ondas eletrofisiológicas I, III e V com latência absoluta e intervalos interpicos dentro da normalidade em ambas as orelhas com limiares eletrofisiológicos de 20dBNA bilateral. O programa de treinamento auditivo foi eficaz na reabilitação das habilidades auditivas.

  13. The Dramatic Development of the Parable of the Prodigal Son in the Sacramental Play by Alonso Remón

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    Rafael Massanet Rodríguez

    2017-11-01

    Full Text Available The parable of the prodigal son is circumscribed as a predominant theme for the authors of the Spanish Golden Age to develop the plot of some of his autos sacramentales. However, among all these playwrights, the figure of Alonso Remón and his piece have been largely ignored. This article reviews the sacramental career of this author and highlights its importance and differences compared to other comedies that address the same theme.

  14. Brazilian offshore wave climate based on NWW3 reanalysis

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    Cássia Pianca

    2010-03-01

    Full Text Available This paper provides a description of the wave climate off the Brazilian coast based on an eleven-year time series (Jan/1997-Dec/2007 obtained from the NWW3 operational model hindcast reanalysis. Information about wave climate in Brazilian waters is very scarce and mainly based on occasional short-term observations, the present analysis being the first covering such temporal and spatial scales. To define the wave climate, six sectors were defined and analyzed along the Brazilian shelf-break: South (W1, Southeast (W2, Central (W3, East (W4, Northeast (W5 and North (W6. W1, W2 and W3 wave regimes are determined by the South Atlantic High (SAH and the passage of synoptic cold fronts; W4, W5 and W6 are controlled by the Intertropical Convergence Zone (ITCZ and its meridional oscillation. The most energetic waves are from the S, generated by the strong winds associated to the passage of cold fronts, which mainly affect the southern region. Wave power presents a decrease in energy levels from south to north, with its annual variation showing that the winter months are the most energetic in W1 to W4, while in W5 and W6 the most energetic conditions occur during the austral summer. The information presented here provides boundary conditions for studies related to coastal processes, fundamental for a better understanding of the Brazilian coastal zone.O presente trabalho apresenta o clima de ondas da região ao largo da costa brasileira com base em uma série temporal de onze anos (Jan/1997-Dez/2007 obtida através de dados de reanálise do modelo operacional NWW3. Informações sobre o regime de ondas no Brasil são escassas e baseadas em observações ocasionais de curto período, sendo a presente análise inédita na escala espaço-temporal apresentada. Para a definição do clima de ondas foram definidos e analisados seis setores ao longo da quebra da plataforma continental brasileira: Sul (W1, Sudeste (W2, Central (W3, Leste (W4, Nordeste (W5 e Norte

  15. Avaliação da redução de potássio em hortaliças submetidas a diferentes métodos de cocção para possível utilização na dietoterapia renal Evaluation of potassium in vegetables submitted to different cooking methods and their possible use in renal diet

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    Cristiane Copetti

    2010-10-01

    Full Text Available Objetivo Julgou-se relevante avaliar a concentração de potássio em vegetais crus submetidos ao remolho e cozidos sob diferentes formas - ebulição, micro-ondas e sob pressão - a fim de verificar se o remolho e as técnicas de cocção têm eficácia na redução da concentração desse mineral. Métodos O experimento foi realizado em delineamento casualizado, com esquema fatorial 3x5 (3 vegetais x 5 proce-dimentos e 3 repetições nas análises. As hortaliças - batata, cenoura e brócolis - foram submetidas à análise dos teores de potássio por fotometria de chama IL, e compararam-se os tratamentos: cru, remolho em água, cocção em ebulição, micro-ondas e sob pressão. Resultados Nas amostras analisadas, para a batata o método remolho (232,2mg/g, ebulição (197,3mg/g, micro-ondas (170,3mg/g e pressão (187,2mg/g não diferiram de forma estatisticamente significativa entre si, da mesma forma para a cenoura, que obteve os valores de redução de 315,0mg/g, 309,9mg/g, 243,3mg/g e 210,6mg/g, respectivamente para remolho, ebulição, micro-ondas e pressão. Entretanto, para os brócolis, pode-se observar que os métodos de preparo em micro-ondas (280,1mg/g e pressão (167,3mg/gdiferiram estatisticamente em relação aos outros métodos, mostrando-se mais eficazes na redução dos teores de potássio dessa hortaliça. Conclusão O remolho e os métodos de cocção mostraram-se eficazes na redução dos teores de potássio nas hortaliças, no entanto fatores como tempo, temperatura, recipiente, potência e frequência das ondas eletromagnéticas do micro-ondas podem influenciar os diferentes tipos de cocção.Objective This study assessed the concentration of potassium in raw and macerated raw vegetables and vegetables cooked by different methods - boiling, microwave and pressure-cooking - to verify if maceration and different cooking methods can effectively reduce the concentration of this mineral. Methods This experiment had a random 3x

  16. Las Ondas de choque acústicas en la prevención y tratamiento de las cicatrices hipertróficas y queloideas en el paciente quemado

    OpenAIRE

    Saez Galdeano, Onofre

    2016-01-01

    Actualmente la cicatrización hipertrófica y queloidea afecta a un número considerable de pacientes post-quemados. Representa la primera causa de morbilidad y complicaciones en el paciente quemado superviviente, sin que se disponga de ningún tratamiento único definitivo ni suficientemente eficaz, generando un gran gasto sanitario. La presoterapia y la silicona tópica son los métodos clásicos y los más empleados hoy en día para la prevención y tratamiento de las cicatrices patológicas en quemad...

  17. DIFFRACTION OF A ELECTROMAGNETIC WAVES BY A PARABOLIC SEMI-CYLINDER

    OpenAIRE

    LEONARDO DE SOUZA MENDES

    1987-01-01

    É analisado o problema de difração de uma onda eletromagnética cilíndrica pela borda de um semi-cilindro parabólico. O problema é formulado em termos das funções de Weber do cilindro parabólico que são soluções da equação de onda em coordenadas cilindro-parabólicas. A solução é obtida com o auxílio da técnica de Wiener-Hopf que fornece, para os campos espalhados, um resultado em termos de uma equação integral. Obtém-se, então, as aproximações assintóticas de...

  18. Determinação direta das fases na difração de raios-X em cristais sem centro de simetria

    OpenAIRE

    Jose Antonio Prado Valladares

    1984-01-01

    Resumo: Um método experimental é proposto para solucionar o problema da fase na difração de raios-X em cristais sem centro de simetria, usando difração múltipla caso três-feixes tipo-Bragg. Este método resulta da consideração da dependência da fase com a assimetria dos perfis de linha, com o sentido da rotação da rede cristalina e com o comprimento de onda da radiação incidente. Casos em que o comprimento de onda da radiação incidente está acima e abaixo da borda de absorção, lE, do átomo mai...

  19. Análisis Estructural de Fallas Geológicas y Potenciales Deslizamientos en Anconcito, Provincia de Santa Elena

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    Kervin Chunga

    2015-10-01

    Los factores que pueden incrementar la tasa de velocidad de deslizamiento de masas de tierra pueden ser: (1 altasprecipitaciones durante el fenómeno del Niño, y (2 la recurrencia de terremotos locales con magnitud moderada Mw≈5 o el arribo de amplificaciones de ondas sísmicas desde terremotos lejanos con magnitudes mayores de Mw>7. En conclusión, el sector de Anconcito debe ser motivo de análisis en detalle que permita establecer técnicas adecuadas para la recuperación de zona de playa y construcción de espigones que permitirán disminuir la alta energía de las ondas marinas.

  20. J. M. W. Turner's painting "The unpaid bill, or the dentist reproving his son's prodigality".

    Science.gov (United States)

    Bishop, M; Gelbier, S; King, J

    2004-12-25

    In November 2002, the BDA News carried an item, illustrated with a colour reproduction, describing a painting of a Georgian dentist's rooms by Joseph Mallord William Turner (1775-1851), one of the most respected of English artists, which was shortly to come up for auction at Christies' Rooms in London. This work, first exhibited in 1808, was entitled "The unpaid bill, or the dentist reproving his son's prodigality", and had originally been commissioned by the connoisseur Richard Payne Knight (1750-1824). "The examiner", a contemporary London journal, identifies the 'cradle-piece' for the commission as being a Rembrandt which Payne Knight owned, and the journalist Robert Hunt said that Turner had more than come up to the task of showing that a modern could handle light as well as the old master, 'for a picture of colouring and effect, it is ... inestimable'.