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Sample records for dudosa ciencia raza

  1. Mujeres de La Raza (Women of the Race).

    ERIC Educational Resources Information Center

    National Hispanic Univ., Oakland, CA.

    This unit profiles nine women of La Raza who have contributed to the betterment of humanity and Hispanic culture. It encourages students to learn about them and other Raza women as models of people involved in the Chicano community. The unit, offered in both Spanish and English, also teaches that these representative Raza women had to overcome…

  2. Toward the Development of a Raza Cinema.

    ERIC Educational Resources Information Center

    Camplis, Francisco X.

    Chicano teatro, poetry, and art appear to be more developed forms of Chicano cultural expression. Chicano literature and film are just getting off the ground. Film is the least developed of the two, primarily because it is an expensive medium. However, this medium can be a tool for social change. "Raza Cinema" could Conceivably include in addition…

  3. Toward a Chicano/Raza Bibliography: Drama, Prose, Poetry

    ERIC Educational Resources Information Center

    Romano, Octavio I. V. Ed.; Rios, Herminio C. Ed.

    1973-01-01

    Separated into 3 sections, this bibliography covers literature, drama, prose, and poetry (from 1965 to 1972) pertaining to Chicanos and La Raza. To obtain this material, all Chicano journals, newspapers, bulletins, and newsletters published in the Southwest were reviewed. Topics range from police brutality to the Vietnam War. The appendix gives…

  4. La Raza: A Selective Bibliography of Library Resources Addenda.

    ERIC Educational Resources Information Center

    Nupoll, Karin, Comp.

    Books, periodicals, recordings, art works, government documents, and bibliographies, dating mostly from 1960, are included in this 1978 addendum to the 1973 edition of "La Raza: A Selective Bibliography of Library Resources". Similar in format to the earlier volume, the addendum contains 1,616 non-annotated entries organized into 31 Library of…

  5. Casa De La Raza: Separatism or Segregation -- Chicanos in Public Education.

    ERIC Educational Resources Information Center

    Southwest Network, Hayward, CA.

    Casa de la Raza, a K-12 grade school, operated from September 1971 to June 1973 as part of the Berkeley Unified School District's Experimental Schools Program. Based on the belief that using the student's home culture and language within the instructional program would foster personal growth and academic advancement, Casa used a bilingual…

  6. El Dia de la Raza Module. Secondary Level. [The Day of the Race Module. Secondary Level.

    ERIC Educational Resources Information Center

    Herrera, Gloria; Lizcano, Jeanette

    "El Dia de la Raza", considered the birthday of the mestizo, is the topic of this unit for the secondary level. As unit objectives, the students are to demonstrate (1) their comprehension by stating 3 major areas of contributions the Indians and the Spaniards gave the mestizo culture and (2) their concept of mestizaje by participating in oral…

  7. The Development of La Raza Community Leadership and Its Impact on Social Problems -- A Causal Model.

    ERIC Educational Resources Information Center

    Rivera, Felix G.

    The paper introduces a 3-level paradigm for community assessment. First, Raza communities are conceptualized as belonging to three phases--culturally homogeneous, culturally in transition, and culturally heterogeneous. Each phase is determined by the proximity of the cities'"barrios" to the home country (Mexico, Puerto Rico, Central America) and…

  8. Ciencias 2 (Science 2). [Student's Workbook].

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    Ciencias 2 is the second in a series of elementary science textbooks written for Portuguese-speaking students. The text develops the basic skills that students need to study their surroundings and observe natural facts and phenomena by following scientific methods. The book is composed of 10 chapters and includes 57 lessons. Topics included are…

  9. Ciencias 1. (Science 1). [Student's Workbook].

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    Ciencias 1 is the first in a series of science books designed for elementary Portuguese-speaking students. The book contains five sections divided into 43 lessons. The five sections are (1) Matter, (2) The Human Body, (3) Weather, (4) Solids, Liquids, and Gases, and (5) Living Things. Pictorial presentations and picture exercises are included for…

  10. Ciencias 2. Manual do Professor (Science Teacher's Manual).

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    This is the teacher's manual for Ciencias 2, the second in a series of elementary science textbooks for Portuguese-speaking students. The student textbook contains 10 chapters and 57 activities. The teacher's manual presents an explanation of the educational goals and the organization of the content, Topics included are environment, the human,…

  11. Ciencias 1. Manual do Professor (Science 1. Teacher's Manual).

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    This is the teacher's guide for Ciencias 1, the first in a series of science books designed for Portuguese-speaking students in elementary schools. The guide contains materials corresponding to the student's book. Included are five sections comprised of 43 lessons. The teacher's guide also contains lesson objectives, suggestions for lesson…

  12. Actitudes de los candidatos y maestros de ciencias en servicio acerca del uso de las herramientas computadorizadas en las clases de ciencias

    NASA Astrophysics Data System (ADS)

    Bayuelo, Ezequiel

    Este estudio examino y comparo las actitudes de los candidatos a maestros de ciencias y los maestros de ciencias en servicio acerca de la utilizacion de las herramientas computadorizadas en las clases de ciencias. Tambien identifico y diferencio el uso que ellos dan a estas herramientas en las clases de ciencias. Este estudio presenta un diseno descriptivo exploratorio. Constituyeron la muestra trescientos diez sujetos que fueron candidatos a maestros de ciencias o maestros de ciencias en servicio. Para recoger los datos se construyo y valido un cuestionario de treinta y un itemes. Se utilizaron las pruebas estadisticas no parametricas Kruskal Wallis y Chi-cuadrado (test de homogeneidad) para establecer las diferencias entre las actitudes de los sujetos con relacion al uso de las herramientas computadorizadas en las clases de ciencias. Los hallazgos evidenciaron que son positivas y muy parecidas las actitudes de los candidatos a maestros y maestros en servicio hacia el uso de las herramientas computadorizadas. No hubo diferencias entre los candidatos y maestros en servicio en terminos de las actitudes de confianza y empatia hacia el uso de las herramientas computadorizadas en las clases de ciencias. En aspectos como el uso del banco de datos bibliografico Eric y el uso de las herramientas computadorizadas en actividades educativas como explorar conceptos, conceptuar, aplicar lo aprendido y hacer asignaciones hubo diferencias estadisticamente significativas entre los candidatos y los maestros en servicio. Al comparar las frecuencias observadas con las esperadas hubo mas maestros en servicio y menos candidatos que indicaron usar el anterior banco de datos y las herramientas computadorizadas en las mencionadas actividades educativas.

  13. [Cervix cancer and pregnancy. Experience of 5 years at the Gynecology-Obstetrics Hospital No. 3, C. M. La Raza from the Mexican Institute of Social Security].

    PubMed

    Novoa Vargas, A; Padilla Cortez, M E; Bacelis Castaño, C

    1999-12-01

    Of the 300 clinical files of pregnant women, 22 were associated with cancer plus pregnancy in 5 years. Of them 7 were excluded in the work. 15 patients with CaCu and pregnancy were studied in the Gineco-Obstetric Hospital No. 3 C.M. La Raza of the IMSS México City in a period since 1st of January 1988 to 31st December of 1992. Early menarchia and sexual life, take an important roll in the mexican women as predisponent factors, multideliver and tobacco too. The colposcopy with manage cervix biopsy is the election method of diagnosis, with 99.5% of confiability. In the 15 patients, the estirpe was epidermoid cancer in all of them. The diagnosis of pregnancy age made in the first and third trimester of gestation. Only in 3 patients (20%) were founded visible lesion, this rename the necessity of make detection of CaCu during the pregnancy, because we will can found the cases in preinvader stages or early invader, that cure highly, like the cases seen in this work. Stages preinvader and early invaders during the pregnancy are highly curatives. We concluded that they have worst prognosis of survival, aggressivity and early relapse in patients with pregnancy stage by stage. The last because in the Historical Literature review about this topic, there was statistical relevance about pregnancy in the women with CaCu, using our work for reference. CaCu does change his prognosis associated with the pregnancy. PMID:10692806

  14. Las ideologias, las ciencias naturales y sus implicaciones en la educacion cientifica

    NASA Astrophysics Data System (ADS)

    Lozada Roldan, Sandra

    Este estudio ausculto las concepciones epistemologicas de los docentes de ciencia del nivel secundario con relacion a las ideologias y las ciencias naturales. Tambien examino las posiciones de los docentes ante asuntos publicos relacionados a la ciencia. Para propositos de este estudio se diseno y se valido el cuestionario con el cual se obtuvieron los resultados. La investigacion es de tipo cuantitativa y se utilizo como diseno la encuesta. El cuestionario se administro en varias actividades de desarrollo profesional para maestros de ciencia. Un total de 78 maestros del nivel secundario respondieron el cuestionario. Para analizar los datos obtenidos se utilizaron estadisticas descriptivas como la distribucion de frecuencia y el porciento. Ademas se establecieron codigos y categorias para describir las posiciones de los maestros ante asuntos publicos relacionados a la ciencia. Los analisis demostraron que entre los docentes participantes de este estudio prevalecen ciertas concepciones epistemologicas adecuadas acerca de las ciencias naturales, a la luz de la literatura consultada. Entre estas concepciones se destacan las siguientes: a) la filosofia materialista de las ciencias naturales, b) la naturaleza tentativa y constructivista del conocimiento cientifico, c) el uso de una metodologia que garantiza cierto grado de objetividad y con el que se justifican y validan los enunciados cientificos y d) la funcion instrumental del conocimiento cientifico. Sin embargo, entre los docentes participantes de este estudio prevalecen ciertas concepciones epistemologicas erroneas acerca de las ciencias naturales, a la luz de la literatura consultada. Entre estas concepciones se destacan las siguientes: a) tendencia inductivista en el que las teorias cientificas comienzan con observaciones que establecen generalizaciones, b) secuencia jerarquica de la metodologia cientifica. Ademas, entre los docentes participantes de este estudio prevalecen concepciones epistemologicas adecuadas

  15. La problematica de la demarcacion entre ciencia y pseudociencia y sus implicaciones en la educacion cientifica

    NASA Astrophysics Data System (ADS)

    Jimenez Tolentino, Dinorah

    2011-12-01

    En la sociedad prevalece una tendencia generalizada hacia la inclusion de creencias y practicas pseudocientificas. Esta investigacion responde a la necesidad de analizar como la proliferacion de las pseudociencias afecta la vision que tienen los estudiantes universitarios sobre las ciencias naturales. A tales efectos, la investigadora describe las concepciones epistemologicas que tienen los estudiantes sobre las ciencias y las pseudociencias e identifica los criterios de demarcacion, entre un area y otra, que se derivan de estas concepciones. De igual modo, esta identifica las creencias y practicas pseudocientificas de mayor arraigo entre los estudiantes, destacando, a su vez, la razon de ser de las mismas. Por ultimo, la investigadora analiza las implicaciones educativas de la problematica de la demarcacion entre ciencia y pseudociencia. La investigacion es de naturaleza mixta, enmarcada en los paradigmas empirico- analitico y cualitativo. El proceso investigativo se llevo a cabo mediante la administracion del cuestionario Criterios para la demarcacion entre ciencia y pseudociencia. La parte cualitativa estuvo enmarcada en el diseno de estudio de caso, recopilando informacion mediante entrevistas semiestructuradas en dos grupos focales. La poblacion de estudio estuvo constituida por estudiantes universitarios del nivel subgraduado de la Universidad Central de Bayamon. Los resultados del estudio reflejaron las concepciones erroneas de los estudiantes sobre la naturaleza de las ciencias y las pseudociencias. Con respecto a la demarcacion entre ciencia y pseudociencia, el criterio imperante entre los universitarios es el de la verificabilidad, considerando la aplicacion del metodo cientifico como el metodo para demostrar la veracidad de las teorias cientificas. Las creencias y practicas pseudocientificas no son muy frecuentes entre los universitarios. Estos atribuyen las mismas a la prevalencia de elementos supersticiosos y al engano a que es sometida la poblacion

  16. Investigaccion-accion en la sala de clases sobre las creencias de la cultura de la ciencia de un grupo de estudiantes universitarios y su relacion reciproca con el aprendizaje de las ciencias biologicas

    NASA Astrophysics Data System (ADS)

    Cordova-Santiago, Lizzette Astrid

    La investigacion---accion que se llevo a cabo en la sala de clases tenia como punto de partida las creencias de la cultura de la ciencia de un grupo de estudiantes universitarios para luego examinar sus implicaciones en el proceso de aprendizaje de las Ciencias Biologicas. ¿Que se supone que hagan las creencias en relacion con el aprendizaje? ¿En que consiste incorporar este aspecto a la practica educativa universitaria? Utilizando el modelo de Kemmis y McTaggart (1987) la investigacion-accion se planteo como un proceso dinamico en cuatro momentos en espiral constituidos por la planificacion, la accion, la observacion y la reflexion. Cada una de las fases tuvo una intencion retrospectiva y prospectiva formando una espiral de autorreflexion del conocimiento y la accion. Se llevaron a cabo audio grabaciones en clases y analisis de documentos. Ademas, la profesora-investigadora hizo un portafolio para reflexionar sobre las creencias de la cultura de la ciencia que tienen los estudiantes y las creencias del aprendizaje que tiene la profesora y sobre como la comprension de estos elementos ayudo a mejorar su practica educativa a traves del tiempo. Los resultados obtenidos apuntan a que las creencias de la cultura de la ciencia que tiene el grupo de estudiantes son diversas. Ellos si creen que la ciencia tiene una cultura la cual describieron como: complicada y desconocida que evoluciona constantemente, que es un conjunto de metodos, que es altamente tecnologica, que resuelve problemas de salud, ayuda a interpretar la realidad del mundo que los rodea y su origen y que existen unas intersecciones entre la ciencia y el poder. Sobre las creencias del proceso de aprendizaje de la profesora-investigadora, estas senalan que el modelaje de actores, la vision de la academia que tiene ella asi como la participacion y negociacion entre todos los involucrados en el proceso educativo, son factores que inciden en el proceso de aprendizaje.

  17. [Experience in liver transplantation (1996-2011) at the UMAE, General Hospital Gaudencio González Garza, National Medical Center La Raza, Mexican Institute of Social Security, Mexico City, D.F].

    PubMed

    Hernández-Domínguez, José Mariano; Holm-Corzo, Alberto; Santos-Caballero, Marlene; Porras-Ramos, Miguel Angel; Gómez-Casanova, Pedro; Pérez-Molina, Lorenzo; Villaseñor-Colín, César; Muñiz-Toledo, Vérulo; López-Sánchez, Héctor; Hernández-Becerril, Hector; Espinosa-González, Alfonso; Martínez-Jiménez, Oscar; Torres-Amaya, Mario; D'ector-Lira, Dulce; Medina-Ramírez, Marino; Sanabria-Trujillo, Giovanni; Villafuerte-Muñoz, Gloria; Alanís-Jacobo, Verenice; Rocha-Avila, Gustavo; Zaldívar-Cervera, Jaime

    2011-09-01

    We present the experience of General Hospital CMN La Raza from 1996 to 2011. In this period, we have made 40 liver transplants in adults and 22 pediatric liver transplants. A 100% of adult population received a graft from deceased donor; while in the pediatric age group, 60% were from deceased donor and 40% from living donor. The long-term follow-up is shown only for adult group due to lack of data in the pediatric group. The mean age for the adult group is 42 years old and 4.5 years for the pediatric group. The main indications for liver transplantation in adults were: cirrhosis due to chronic hepatitis C in 47.5% and cirrhosis due to alcohol abuse in 15% of the group. In the pediatric group was more likely the biliary atresia (60%) as an indication for liver transplantation followed by fulminant hepatitis (15%). We show the evolution of the hepatectomy's technique in the adult group: it was initially using conventional technique and later it changed to preservation of cava vein (Piggy Back). In the same way, the reconstruction of the bile-duct was initially made using a T-tube stenting and currently, we use end to end bile-duct reconstruction. The patient's survival at 1, 5, and 10 years was 41.5, 27.2, and 13.6%, respectively; with a median of global survival of 6.2 months. Long-term patient's survival has improved after 2004 compared to previous period. PMID:22916613

  18. Conceptuaciones de los estudiantes de las facultades de educacion y ciencias naturales de la Universidad de Puerto Rico, recinto de Rio Piedras, acerca de la ciencia y la pseudociencia

    NASA Astrophysics Data System (ADS)

    Reyes Medina, Hector A.

    Esta investigacion describe las conceptuaciones de los estudiantes de tercer ano o mas a nivel de bachillerato de los programas de Educacion en Ciencia y Ciencias Naturales de la Universidad de Puerto Rico, Recinto de Rio Piedras, acerca de lo establecido en la literatura para distinguir el conocimiento cientifico de las creencias pseudocientificas. Este estudio se guio por un diseno tipo encuesta transversal que permitio conocer de manera consistente las conceptuaciones de los estudiantes encuestados acerca de la Ciencia y la Pseudociencia. Ademas, permitio desarrollar inferencias estadisticas relacionadas a la poblacion de estudio, sus conceptuaciones y su inclinacion teorica en torno al Realismo y al Racionalismo cientifico moderados. El instrumento utilizado fue el Cuestionario acerca de las concepciones de la ciencia y la pseudocienca en estudiantes universitarios, Reyes (2015). Este cuestionario fue validado mediante la recopilacion de diversas fuentes de evidencias, entre estas se encuentran las evidencias basadas en el contenido, el proceso de respuesta, la estructura interna y de constructo. Tambien, se calculo el Alfa de Crombach para la escala total y para cada componente y se realizo un analisis de factores que demostro la presencia de seis componentes claramente definidos de acuerdo a lo esperado sobre las caracteristicas originales del instrumento. Las estadisticas utilizadas fueron descriptivas. Participaron 302 alumnos, de las facultades de educacion y ciencias naturales. Se encontro que las conceptuaciones de los estudiantes de ambas facultades se inclinan en un 66.2% a favor con lo establecido en el modelo teorico en torno al Realismo y al Racionalismo cientifico moderados. Sin embargo, aun hay un 33.8% de los estudiantes de ambas facultades que poseen conceptuaciones distintas al modelo teorico propuesto.

  19. Can a Spanish Science Education Journal Become International? The Case of "Enseñanza De Las Ciencias"

    ERIC Educational Resources Information Center

    Espinet, Mariona; Izquierdo, Mercè; Garcia-Pujol, Clara

    2015-01-01

    In this paper we discuss the case of the science education research journal "Enseñanza de las Ciencias" ("EC") around the issue of its internationalization and the consequences this process has had and is still having on the use and preservation of different languages and more specifically the Castilian (Spanish) language. We…

  20. La preparacion en ciencia de los candidatos a maestros del nivel elemental primario segun la reforma de la educacion cientifica en Puerto Rico: Una propuesta de secuencia curricular

    NASA Astrophysics Data System (ADS)

    Rodriguez Plaza, Evelyn

    El proposito de esta investigacion fue identificar los componentes de la preparacion en ciencia que deben recibir los estudiantes del Bachillerato en Artes en Educacion Elemental, Nivel Primario, de acuerdo a los documentos que dirigen la reforma de la educacion cientifica en Puerto Rico. Tambien, se identificaron los componentes de los cursos que forman parte de la preparacion en ciencia de estos estudiantes. Se compararon los componentes de la preparacion en ciencia y los componentes de los cursos para determinar congruencias y discrepancias. Con los datos recopilados se identificaron los componentes de los cursos de una secuencia curricular para la preparacion en ciencia de los candidatos a maestros del nivel elemental primario. La secuencia curricular que se propone en esta investigacion incluye cursos de contenido cientifico y de metodologia en la ensenanza de la ciencia disenados para satisfacer las necesidades de los candidatos. Se recomienda que en los procesos para el diseno, la implantacion y la evaluacion de estos cursos participen profesores de ciencia, profesores de educacion y maestros del nivel elemental primario. Todos los cursos de la secuencia curricular deben tener un enfoque constructivista. Las experiencias educativas que se incluyan en los cursos deben aspirar a desarrollar en los candidatos los atributos de la cultura cientifica y actitudes positivas hacia la ciencia y hacia la ensenanza de esta disciplina. El modelaje por parte de los profesores que ensenen los cursos de la secuencia curricular es fundamental en el desarrollo profesional de los candidatos. Se recomienda que en los cursos de contenido cientifico se estudien los conceptos y los conocimientos cientificos que forman parte del curriculo de Kindergarten a tercer grado de forma integrada y con una profundidad universitaria. Estos cursos deben tener un enfoque interdisciplinario e incluir el estudio de la naturaleza de la ciencia y un componente de laboratorio para desarrollar los

  1. Bases para la elaboracion de unidades didacticas de calidad en el area de ciencias (Fisica y Quimica 3 deg ESO)

    NASA Astrophysics Data System (ADS)

    Maccioni, Elena Lucia

    Este Trabajo Fin de Master tiene como objeto, el estudio previo de la educacion de la ciencia en la actualidad y mas destacable, del diseno de las unidades didacticas segun las metodologias mas frecuentes aplicadas por los diferentes sistemas educativos en el area de las Ciencias teniendo en cuenta la importancia y el efecto de la psicologia del alumnado y todo ello como no puede ser de otro modo bajo el corse de la Legislacion aplicable, Estatal, Autonomica y europea. Con estos antecedentes, se extrae cuales son las preguntas que deben contestarse en la elaboracion de una unidad didactica de calidad en el contexto, generacional (edad y sexo), del Proyecto Educativo de Centro, y de la Programacion del Departamento, discutiendo y justificando cada uno de los apartados en que estructuradamente dividiremos dicha Unidad, con un formato manejable, util, y dinamico en el tiempo que sea un verdadero instrumento educativo de aula. Teniendo en cuenta estas premisas, se procede a hacer una recopilacion de una misma unidad didactica publicada por diferentes editoriales, elegidas no al azar, sino en funcion de su penetracion editorial en nuestros centros de ESO, siendo las elegidas (SM y Oxford). Las diferentes unidades seleccionadas son analizadas de forma critica, atendiendo a los criterios generales de calidad bajo parametros cientificos y normativos, concluyendo con la aportacion final que es la redaccion de unas pautas cientifico-pedagogicas, para redactar unidades didacticas de calidad en el area de la Ciencias, en concreto en la Asignatura de Fisica y Quimica de 3º de ESO.

  2. La implantacion del enfoque constructivista en el aula de ciencia: Estudio de caso multiple

    NASA Astrophysics Data System (ADS)

    Arroyo Betancourt, Luz I.

    Esta investigacion estudia la implantacion del enfoque constructivista en tres aulas de ciencia del contexto puertorriqueno. Se auscultaron las practicas educativas que utilizan maestras consideradas constructivistas y la correspondencia de sus practicas educativas con los elementos esenciales de la didactica que proponen los teoricos de los planteamientos constructivistas. Se ausculto, ademas, a que vision del enfoque constructivista responden las expresiones de las maestras acerca de su practica educativa y como compara con su quehacer, a la luz de los elementos esenciales de las visiones constructivistas piagetiana, social y radical. Se utilizo el diseno de estudio descriptivo de caso multiple. El estudio se baso en entrevistas a profundidad, revision de documentos y observacion no participativa a la sala de clases. El contexto fueron tres escuelas publicas de la Region Educativa de San Juan, una elemental, una intermedia y una superior. Los resultados confirmaron que la transicion hacia el enfoque constructivista es un proceso que toma tiempo, dedicacion y la participacion en adiestramientos y readiestramientos acerca del nuevo enfoque. Las maestras coinciden en la mayoria de las practicas educativas que utilizan para implantar el enfoque constructivista de ensenanza y difieren en algunas debido, probablemente, a que han tenido que adaptarlas a los correspondientes niveles de ensenanza: elemental, intermedio y superior. Dos de las maestras planifican por conceptos generadores, mientras que una de ellas planifica siguiendo la guia que recibe del Departamento de Educacion. Difieren ademas, en el enfasis que confieren al inquirir cientifico. Con relacion a la correspondencia entre la vision manifestada por las maestras a la luz de las visiones piagetiana, social y radical, aparentemente, las preguntas del protocolo de entrevistas no lograron evocar la informacion con suficiente profundidad, por lo que la investigadora tuvo que inferir las visiones de las

  3. Analisis del contenido curricular de los Documentos Normativos del Programa de Ciencias en el area de biologia para la escuela superior del sistema de educacion publica de Puerto Rico: 1993-2012

    NASA Astrophysics Data System (ADS)

    Davila Montanez, Melissa

    Esta investigacion de naturaleza cualitativa se ocupo de realizar un analisis de contenido documental de los Documentos Normativos del Programa de Ciencias en el area de biologia de la escuela superior del sistema de educacion publica de Puerto Rico del periodo 1993-2012. Los documentos analizados fueron: Guia Curricular, 1995; Marco Curricular, 2003; Estandares de Excelencia, 1996, 2000 y Estandares de Contenido y Expectativas de Grado, 2007. Se indago si hubo cambios en significados en los Componentes Estructurales: Naturaleza de la ciencia, Paradigmas para la ensenanza de la ciencia, Funcion del curriculo formal, Mision de la ensenanza de la ciencia; Contenidos, destrezas y competencias, Estrategias de ensenanza y Evaluacion/Assessment del aprendizaje. El analisis sugiere que no hubo cambios sustanciales en los significados de los Componentes Estructurales. Los documentos estudiados muestran mayormente caracteristicas similares, aunque los documentos mas recientes eran mas descriptivos, explicativos y especificos.

  4. Can a Spanish science education journal become international? the case of Enseñanza de las Ciencias

    NASA Astrophysics Data System (ADS)

    Espinet, Mariona; Izquierdo, Mercè; Garcia-Pujol, Clara

    2015-12-01

    In this paper we discuss the case of the science education research journal Enseñanza de las Ciencias (EC) around the issue of its internationalization and the consequences this process has had and is still having on the use and preservation of different languages and more specifically the Castilian (Spanish) language. We first frame the concept of globalization and internationalization, and identify three important dimensions involved in the process of internationalization of EC such as language use, actors involved and resources available. Secondly, we address the historical evolution of EC along three phases of internationalization. In each phase we discuss the tensions experienced in relevant internationalization dimensions focusing particularly on the use of languages. We conclude by advocating a plurilingual and multicultural model for a science education research journal as an alternative to the hegemony of international English written journals. In doing so we want to continue the conversation on the role that local and national science education research journals have in promoting science education around the world.

  5. Ciencia en Espanol.

    ERIC Educational Resources Information Center

    Schon, Isabel

    1992-01-01

    A guide for teachers and librarians covering over 50 Spanish-language books that introduce children to various animals; the world around them; colors, shapes, and numbers; the universe; basic science concepts; and the process of conception, pregnancy, and birth. (MDH)

  6. La Familia de la Raza. (The Family of the Race.)

    ERIC Educational Resources Information Center

    Armas, Jose

    Chicanos in this country have been in a constant state of struggle for economic and cultural survival; yet the Chicano's family has remained the most important part of his culture. Chicano values, customs, life styles, and language are still very much a part of his family. This publication discusses the Chicano's family, covering: (1) la familia…

  7. Readings on La Raza--The Twentieth Century.

    ERIC Educational Resources Information Center

    Meier, Matt S., Ed.; Rivera, Feliciano, Ed.

    This chronological anthology consists of documents and articles on the history of Mexican American people in the 20th century. The anthology may be directed to students in higher education, historians, and those interested in the Mexican American people. Section I spans the period from 1900 to 1920 and introduces immigration as the starting point…

  8. La Raza: A Selective Bibliography of Library Resources.

    ERIC Educational Resources Information Center

    Tash, Steven, Comp.; Nupoll, Karin, Comp.

    Intended to aid students and faculty to know about the Chicano experience, this bibliography cites 3,173 sources, covering the period between 1878 and 1972, found at the California State University library. Because of the interdisciplinary nature of the Chicano experience, the materials have been arranged according to the Library of Congress list…

  9. The type-material of Arctiinae (Lepidoptera, Erebidae) described by Burmeister and Berg in the collection of the Museo Argentino de Ciencias Naturales Bernardino Rivadavia (Buenos Aires, Argentina)

    PubMed Central

    Beccacece, Hernán M.; Vincent, Benoit; Navarro, Fernando R.

    2014-01-01

    Abstract Carlos G. Burmeister and Carlos Berg were among the most important and influential naturalists and zoologists in Argentina and South America and described 241 species and 34 genera of Lepidoptera. The Museo Argentino de Ciencias Naturales Bernardino Rivadavia (MACN) housed some of the Lepidoptera type specimens of these authors. In this study we present a catalogue with complete information and photographs of 11 Burmeister type specimens and 10 Berg type specimens of Phaegopterina, Arctiina and Pericopina (Lepidoptera, Erebidae, Arctiinae, Arctiini) housed in the MACN. Lectotypes or holotypes were designated where primary type specimens could be recognized; in some cases we were not able to recognize types. The catalogue also proposes nomenclatural changes and new synonymies: Opharus picturata (Burmeister, 1878), comb. n.; Opharus brunnea Gaede, 1923: 7, syn. n.; Hypocrisias jonesi (Schaus, 1894), syn. n.; Leucanopsis infucata (Berg, 1882), stat. rev.; Paracles argentina (Berg, 1877), sp. rev.; Paracles uruguayensis (Berg, 1886), sp. rev. PMID:25061380

  10. Birds of Antioquia: Georeferenced database of specimens from the Colección de Ciencias Naturales del Museo Universitario de la Universidad de Antioquia (MUA)

    PubMed Central

    Rozo, Andrea Morales; Valencia, Fernando; Acosta, Alexis; Parra, Juan Luis

    2014-01-01

    Abstract The department of Antioquia, Colombia, lies in the northwestern corner of South America and provides a biogeographical link among divergent faunas, including Caribbean, Andean, Pacific and Amazonian. Information about the distribution of biodiversity in this area is of relevance for academic, practical and social purposes. This data paper describes the dataset containing all bird specimens deposited in the Colección de Ciencias Naturales del Museo Universitario de la Universidad de Antioquia (MUA). We curated all the information associated with the bird specimens, including the georeferences and taxonomy, and published the database through the Global Biodiversity Information Facility network. During this process we checked the species identification and existing georeferences and completed the information when possible. The collection holds 663 bird specimens collected between 1940 and 2011. Even though most specimens are from Antioquia (70%), the collection includes material from several other departments and one specimen from the United States. The collection holds specimens from three endemic and endangered species (Coeligena orina, Diglossa gloriossisima, and Hypopirrhus pyrohipogaster), and includes localities poorly represented in other collections. The information contained in the collection has been used for biodiversity modeling, conservation planning and management, and we expect to further facilitate these activities by making it publicly available. PMID:24899851

  11. Libros de Ciencias en Espanol.

    ERIC Educational Resources Information Center

    Schon, Isabel

    1997-01-01

    Presents an annotated list of recently published science trade books in Spanish that can engage students in a variety of science concepts. Books are listed in the categories of biology, ecology, general science, and technology. (JRH)

  12. Libros de Ciencias en Espanol

    ERIC Educational Resources Information Center

    Schon, Isabel

    2004-01-01

    Spanish-speaking children, like children everywhere, are naturally interested in the world around them. If teachers are to encourage their understanding and appreciation of the natural and physical sciences, they should provide them with a wide variety of books they can read and understand. From board books about farm animals to a high-interest…

  13. Desarrollo de una Interfaz de Control para un Observatorio Astronómico Robotizado con fines educativos en la Facultad de Ciencias Exactas; Físicas y Naturales de la UNSJ

    NASA Astrophysics Data System (ADS)

    Pogrebinsky, L.; Francile, C.

    We report the development and the construction of an Interface to Control a robotized Astronomical Observatory (ICOA), which allows to control the operation of an observatory based on a Meade LX200 telescope. The interface operates together with a computer to control and supervise all the local variables of the observatory, and can take the control of it in risky situations. It serves as a link among the control computer and all the necessary devices for the astronomical observation such as the telescope, the dome, the weather station, the CCD camera, the calibration devices and the security devices. The computer receives orders from an operator who can be or not at the site of observation. The goal of this robotized observatory is the operation in a secure, autonomous and unattended way, with the purpose of to be used remotely by the students of the "Facultad de Ciencias Exactas, Físicas y Naturales" of the UNSJ. FULL TEXT IN SPANISH

  14. Discussions about the Nature of Science in a Course on the History of Astronomy. (Spanish Title: Discusiones sobre la Naturaleza de la Ciencia en un Curso sobre Historia de la Astronomía.) Discussões sobre a Natureza da Ciência em um Curso sobre a História da Astronomia

    NASA Astrophysics Data System (ADS)

    Pires de Andrade, Victória Flório; L'Astorina, Bruno

    2010-07-01

    There are an increasing number of researches in science education that affirm the importance of discussions on the "nature of science" in basic education level as well as in teacher training. The history of science applied to education is a way to contextualize epistemological discussions, allowing both the understanding of scientific content and learning about science concepts. We present some reasonably consensual definitions on the nature of science that have been widely discussed by the academic community. We show also some episodes in the history of astronomy which can lead to discussions involving some aspects of the nature of science, and how they can do it. Hay un número creciente de investigaciones en la enseñanza de las ciencias que afirman la importancia de debates sobre la "naturaleza de la ciencia" en la educación básica y formación del profesorado. La historia de la ciencia aplicada a la educación es una manera de contextualizar los debates de la epistemología, lo que permite tanto la comprensión de los contenidos científicos como el aprendizaje de conceptos científicos. En esto trabajo, presentamos algunas definiciones bastante consensuales sobre la naturaleza de la ciencia que han sido ampliamente discutidas por la comunidad académica y mostramos cómo algunos episodios en la historia de la astronomía pueden llevar a discusiones sobre algunos aspectos de la naturaleza de la ciencia. Há um número crescente de pesquisas na área de ensino de ciências que afirmam a importância de discussões sobre a "natureza da ciência" na educação básica e na formação de professores. A história da ciência aplicada ao ensino é uma maneira de contextualizar discussões epistemológicas, permitindo tanto a compreensão de conteúdos científicos quanto o aprendizado de noções sobre as ciências. Neste trabalho apresentamos algumas definições razoavelmente consensuais sobre a natureza da ciência que foram amplamente discutidas pela

  15. Tempest, Arizona: Criminal Epistemologies and the Rhetorical Possibilities of Raza Studies

    ERIC Educational Resources Information Center

    Serna, Elias

    2013-01-01

    This essay looks at Ethnic Studies activism in Arizona through a rhetorical lens in order to highlight epistemological aspects of activities such as a high school Chicano Literature class, Roberto "Dr. Cintli" Rodriguez's journalism, and student activism to defend the Mexican-American Studies Department. Taking rhetoric's premise that language is…

  16. News Teaching Support: New schools network launched Competition: Observatory throws open doors to a select few Festival: Granada to host 10th Ciencia en Acción Centenary: Science Museum celebrates 100 years Award: Queen's birthday honour for science communicator Teacher Training: Training goes where it's needed Conference: Physics gets creative in Christchurch Conference: Conference is packed with ideas Poster Campaign: Bus passengers learn about universe Forthcoming events

    NASA Astrophysics Data System (ADS)

    2009-09-01

    Teaching Support: New schools network launched Competition: Observatory throws open doors to a select few Festival: Granada to host 10th Ciencia en Acción Centenary: Science Museum celebrates 100 years Award: Queen's birthday honour for science communicator Teacher Training: Training goes where it's needed Conference: Physics gets creative in Christchurch Conference: Conference is packed with ideas Poster Campaign: Bus passengers learn about universe Forthcoming events

  17. Ciencia, Sociedad, Soluciones: Una Introduccion al USGS

    USGS Publications Warehouse

    U.S. Geological Survey

    2001-01-01

    El USGS sirve a la nacion de los Estados Unidos proveyendo informacion fidedigna para ? Describir y comprender la Tierra; ? Minimizar la perdida de vidas y propiedades por desastres naturales; ? Manejar los recursos hidrologicos, biologicos, energeticos y minerales; y ? Mejorar y proteger nuestra calidad de vida.

  18. Ciencias 3. (Science 3). Student Book.

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    This grade 3 textbook, the third in a series of elementary science textbooks written in Portuguese, consists of readings, activities, and review exercises on biological, physical, geological, and nutrition/health concepts. The book is organized into nine sections. Among the topic areas included in these sections are: (1) solar energy, electricity,…

  19. Ciencia: Nivel A (Science: Level A).

    ERIC Educational Resources Information Center

    Duron, Dolores; And Others

    A teacher's manual was developed for an elementary level science course in Spanish as part of an immersion program for English speaking children. The Level A manual is designed for kindergarten and grade 1 pupils. The five units cover the basic concepts of the weather, colors, animals, plants, and the five senses. Each unit includes vocabulary,…

  20. The Science Teachers and Their way of Thinking about Astronomy. (Spanish Title: Los Profesores de Ciencias y Sus Formas de Pensar la Astronomía.) Os Professores de Ciências e Suas Formas de Pensar a Astronomia

    NASA Astrophysics Data System (ADS)

    Leite, Cristina; Hosoume, Yassuko

    2007-12-01

    The research presented in this article is about the way science teachers from Elementary School think about astronomical elements. Its methodology is based on semi-structured interviews, which were video recorded. The research is centered in a three-dimensional perspective of astronomical Earth, the Sun, the Moon, the planets and the stars, and also the conceptions about sky and Universe. The esults indicate a Universe that contains: Sun, stars, planets and Moon; where the Solar System is a little part of the whole. Sometimes they think that the Solar System is the Universe. The objects are in the sky or in the Universe, which, for many of them, is only the space above the Earth. The flat shape of astronomical objects and the spatial structure of the Universe are striking features. Many of them think that Sun and stars are different: the Sun is a hot object and the stars are cold ones. These results worry us and they certainly indicate how urgent it is to plan Professional Development in Astronomy for teachers, after all the PCN's emphasize that this subject is important to be taught. El objeto de investigación de este artículo es la manera de pensar sobre los elementos de la Astronomía de los profesores de Ciencias en la enseñanza fundamental. La metodología consiste en entrevistas semi-estructuradas, filmadas en video y centradas en la tridimensionalidad de los elementos astronómicos, para posibilitar un mapeamiento de las concepciones sobre las formas y dimensiones de la Tierra, del Sol, de la Luna, de los planetas y de las estrellas, como también de la concepción de cielo y de Universo en su totalidad. Los resultados indican un Universo conteniendo: Sol, estrellas, planetas y Luna, donde el Sistema Solar se ubica como parte. Algunas veces, el Universo es concebido como el propio Sistema Solar. Los objetos están en el cielo o en el Universo, que, para muchos, se restringe al espacio que está arriba de la Tierra. La forma plana de los objetos astron

  1. [AIDS in children. 8 years experience at La Raza Medical Center Infectology Hospital, Mexican Social Security Institute].

    PubMed

    Pérez-Rodríguez, G E; Gorbea-Robles, M C; Torres-González, F

    1992-09-01

    The objective for this work was to describe the transmission mechanisms and the clinical behavior of 60 HIV-infected pediatric patients. We studied children from newborn to 15 years old according to the CDC criteria. From January 1985 to February 1992, were evaluated 60 patients, 40 males and 20 females; 25 with perinatal transmission (23 transplacental and 2 breast-feeding), 22 hemophiliacs, 12 by blood transfusion and 1 by intramuscular injection with contaminated needle. The disease was symptomatic in 50 patients, asymptomatic in 5 and indeterminate in 5 cases. Up to date, 28 children are in phase P2, 10 in P0 and P1, and 22 patients have died. The clinical manifestations in 50 patients were: altered growth and development in 50, generalized lymphadenopathy in 30, severe infections in 23, fever in 15, hepatosplenomegaly in 15, chronic diarrhea in 10, and HIV-encephalopathy in one. It is concluded what at present time perinatal transmission is the main mechanism. PMID:1388782

  2. Astronomy in Science Textbooks: An Analysis of Pnld 2008. (Spanish Title: Astronomía en los Libros de Ciencia: un Análisis del Pnld 2008.) Astronomia Nos Livros Didáticos de Ciências: Uma Análise do Pnld 2008

    NASA Astrophysics Data System (ADS)

    Amaral, Patrícia; Quintanilha Vaz de Oliveira, Carlos Eduardo

    2011-12-01

    The importance of the textbooks in classrooms is revealed when studies are pointing that these pedagogical sources are, most of the times, the only source used by the elementary school teachers when preparing their Science lessons. When we analyzed the Astronomy contents in the textbooks approved by the Brazilian Textbook Program 2008 and which, in theory, are the best available in the Brazilian editorial market, we examined some categories in the 2008 Textbook Guide. This research characterizes the frequency of Astronomical contents appearing in the texts, in the pictures, and in the hands-on activities. Additionally, it describes some misconceptions and presents additional information on the collections. La importancia de los libros de texto en las aulas se pone de manifiesto cuando los estudios indican que este recurso educativo es a menudo la única fuente de consulta utilizada por el profesor de ciencias de la escuela primaria para preparar sus lecciones. Cuando analizamos el contenido presente en los libros de texto de astronomía aprobados por el Programa Nacional de Libros de Texto de 2008 y que, en teoría, son los mejores libros disponibles en el mercado editorial brasileño, buscamos examinar algunas categorías que figuran en los libros de texto de la Guía de Libros Didácticos de 2008. El estudio caracteriza la frecuencia del contenido de Astronomía en el texto, en las figuras, y en las actividades de experimentación. También describe algunos errores conceptuales y presenta un conjunto de información adicional sobre las colecciones. A importância dos livros didáticos nas salas de aula revela-se quando estudos apontam que este recurso pedagógico é, muitas vezes, a única fonte de consulta utilizada pelo professor de Ciências do ensino fundamental para a preparação de suas aulas. Quando analisamos os conteúdos de Astronomia presentes nos livros didáticos aprovados no Programa Nacional do Livro Didático de 2008 e que, teoricamente, são os

  3. The Astronomy Club of Araranguá: Educating Science Teachers as Science Communicators. (Breton Title: Clube de Astronomia de AraranguÁ: a Formação de Professores de Ciências Como Divulgadores Científicos. ) Club de Astronomía de Araranguá: la Formación del Profesorado Como Comunicadores de la Ciencia

    NASA Astrophysics Data System (ADS)

    Damasio, Felipe; Allain, Olivier; Antunes Rodrigues, Adriano

    2013-07-01

    -se na Teoria da Aprendizagem Significativa, sempre procurando alcançar a pré-disposição em aprender e produzir material potencialmente significativo, as duas condições necessárias para que a aprendizagem significativa ocorra. El estudio relatado en este trabajo se lleva a cabo desde 2009 en el Instituto Federal de Educação, Ciência e Tecnología de Santa Catarina, campus Araranguá. En él se busca formar a comunicadores de la ciencia durante la formación inicial de los docentes Licenciatura en Ciencias Naturales con especialidad en Física, y también promover acciones de divulgación científica para el público en general en la región de Araranguá a través de un club de astronomía llamado CA2 (Clube de Astronomia Araranguá). Entres las acciones de los estudiantes que se promueven están: producción de videos, programas de radio, conferencias, observaciones nocturnas, la preparación y exposición de carteles, la educación en física para los niños, actividades de formación permanente del profesorado y enseñanza de la física de con el tema generador Astronomía. El trabajo de la formación del profesorado y la difusión de club científico se basa en la teoría del aprendizaje significativo, buscando siempre la predisposición para aprender y producir material potencialmente significativo, las dos condiciones necesarias para que ocurra el aprendizaje significativo.

  4. Ciencia en la Estación Espacial Internacional

    NASA Video Gallery

    Durante más de 10 años, los seres humanos vivieron en la estación espacial las 24 horas, los siete días de la semana Y llevaron a cabo más de 600 experimentos. Fíjate apenas algunos de estos experi...

  5. Lenguaje y Ciencias (Language and Sciences), Vol. 17, No. 3.

    ERIC Educational Resources Information Center

    Zierer, Ernesto, Ed.

    This issue contains two articles in Spanish and three in English on the following topics: the practical presentation of English for Special Purposes (ESP) materials in science programs at the National University of Trujillo, "notional syllabus" and "discourse analysis" in relation to ESP materials, extra-linguistic principles in explaining…

  6. Ciencias 3. Manual do Professor (Science 3. Teacher's Manual).

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    This teaching guide contains materials corresponding to those found in the nine sections of the grade 3 elementary science textbook. It also contains lesson objectives, instructional strategies, classroom activities, and evaluation methods. Among the topic areas found in the nine sections are: (1) solar energy, electricity, and light; (2) solar…

  7. Libros de Ciencias en Espanol (Science Books in Spanish).

    ERIC Educational Resources Information Center

    Schon, Isabel

    1998-01-01

    Describes recently published children's books in Spanish that explain basic facts about animals; introduce students to ecology, the environment, popular inventions, and some of the world's most amazing structures; and entice the very young reader into nature. Titles are divided into the areas of biology, ecology, general science, earth and space…

  8. La Ciencia de los Antiguos Mexicanos: Una Bibliografia Selecta

    ERIC Educational Resources Information Center

    Ortiz-Franco, Luis; Magana, Maria

    1973-01-01

    Fifty-five citations pertaining to the scientific and mathematic development of ancient Mexicans, particularly the Mayas, are given in this select bibliography. The introduction and descriptions of resource libraries in 8 States are in Spanish. (NQ)

  9. Lenguaje y Ciencias (Language and Sciences), Vol. 17, No. 2.

    ERIC Educational Resources Information Center

    Zierer, Ernesto, Ed.

    This issue contains three articles in Spanish, with abstracts in English, dealing with the following topics: (1) technical and scientific language; (2) some types of misrenderings by students in translating from English to Spanish and implications for language instruction; and (3) some theoretical aspects of the formation of technical terms in…

  10. Science Is "Ciencia": Meeting the Needs of Hispanic American Students.

    ERIC Educational Resources Information Center

    Rakow, Steven J.; Bermudez, Andrea B.

    1993-01-01

    Reviews some of the factors known to influence the achievement and retention of Hispanic Americans in technologically related fields. Discusses directions in which research should focus to meet the needs of Hispanic-American students. (PR)

  11. Ciencias 3. Caderno de Exercicios. (Science 3. Workbook).

    ERIC Educational Resources Information Center

    Raposo, Lucilia

    This workbook contains 47 activities and exercises which reinforce lesson topics found in the grade 3 science textbook. These lesson topics, presented in nine sections in the textbook, focus on such areas as: (1) solar energy, electricity, and light; (2) solar system, planets, earth motions, and phases of the moon; (3) gravity, rocks, and erosion;…

  12. Introduction to Life Science (Introduccion a la Ciencia Biologica).

    ERIC Educational Resources Information Center

    Barnhard, Diana; And Others

    These materials were developed to meet an expressed need for bilingual materials for a secondary school Life Science Course. Eight units were prepared. These include the following topics: (1) Introduction to the Scientific Method; (2) The Microscope; (3) The Cell; (4) Single-celled Protists, Plants, and Animals; (5) Multicellular Living Things;…

  13. Nuclear Science Curriculum and Curriculum para la Ciencia Nuclear.

    ERIC Educational Resources Information Center

    American Nuclear Society, La Grange Park, IL.

    This document presents a course in the science of nuclear energy, units of which may be included in high school physics, chemistry, and biology classes. It is intended for the use of teachers whose students have already completed algebra and chemistry or physics. Included in this paper are the objectives of this course, a course outline, a…

  14. Libros de Ciencias en Espanol (Science Trade Books in Spanish).

    ERIC Educational Resources Information Center

    Schon, Isabel

    1999-01-01

    Presents a list of recently published science books in Spanish. Each entry in the annotated bibliography contains publication information, suggested grade level(s), and a brief description of the publication. Books are listed under the categories of Biology, Physical Science, General Science, and For the Very Young. Also includes references and…

  15. Raza de Tesoros. Programa de Lectura y Ensenanza del Lenguaje, Unidad B. Guia para el Maestro (Race of Treasures. Reading and Language Learning Program, Unit B. Teacher's Guide).

    ERIC Educational Resources Information Center

    Dissemination and Assessment Center for Bilingual Education, Austin, TX.

    This is the teacher's guide accompanying a reader and a workbook that are part of an ungraded language arts and reading program that can be used in classes from upper elementary through high school. The program is designed around reading selections which present aspects of history, culture, and present-day experiences of special relevance to the…

  16. Raza de Tesoros. Programa de Lectura y Ensenanza del Lenguaje, Unidad B. Cuaderno de Trabajo (Race of Treasures. Reading and Language Learning Program, Unit B. Workbook).

    ERIC Educational Resources Information Center

    Dissemination and Assessment Center for Bilingual Education, Austin, TX.

    This workbook in Spanish accompanies the reader that is part of an ungraded language arts and reading program that can be used in classes from upper elementary through high school. The program is designed around reading selections which present aspects of history, culture, and present-day experiences of special relevance to the Mexican-American…

  17. Tesoros de mi raza: Programa de lecture y ensenanza del lenguaje (Treasures of My Culture: Reading and Teaching Program for Language Instruction).

    ERIC Educational Resources Information Center

    Santos, Richard G.; And Others

    This teacher's guide, reader and workbook are part of a series of bilingual instructional materials designed for the fourth, fifth, and sixth grades. The present materials are specifically for fourth graders. The goal of the series is to teach Spanish by means of stories that present historical and cultural facts and aspects of the daily life of a…

  18. Raza de Tesoros. Programa de Lectura y Ensenanza del Lenguaje, Unidad B (Race of Treasures. Reading and Language Learning Program, Unit B).

    ERIC Educational Resources Information Center

    Dissemination and Assessment Center for Bilingual Education, Austin, TX.

    This Spanish reader is part of an ungraded language arts and reading program that can be used in classes from upper elementary through high school. The program is designed around reading selections which present aspects of history, culture, and present-day experiences of special relevance to the Mexican-American student. The goals of the program…

  19. Identification and Assessment of Ongoing Educational and Community Programs for Spanish Speaking People. A Report Submitted to the Southwest Council of La Raza, Phoenix, Arizona.

    ERIC Educational Resources Information Center

    Valencia, Atilano A.

    Synoptic reports on 16 selected educational and community programs for Spanish-speaking people are presented in this document. Each report consists of a brief description of the project, an assessment of the program, and recommendations for dissemination and implementation of the project model. Programs reviewed include: (1) The Good Samaritan…

  20. Inclusion of Visually Impaired in the School Programme Scheduled Visit of the Museu de Astronomia e Ciências Afins (MAST). (Breton Title: Inclusão de Deficientes Visuais no Programa de Visita Escolar Programada do Museu de Astronomia e Ciências Afins (MAST).) Inclusión de Discapacitados Visuales en el Programa Escolar Programado del Museo de Astronomía y Ciencias Afines (MAST)

    NASA Astrophysics Data System (ADS)

    de Oliveira Gonçalves, Carla; da Conceição Barbosa-Lima, Maria

    2013-07-01

    que enfrentan dificultades en la escuela. La inclusión debe estar en todas las instituciones educacionales (formales o no). Nuestro objetivo en el trabajo de final de curso de licenciatura, fue el de presentar un relato de la experiencia de mediación a los alumnos con deficiencias visuales del Instituto Benjamin Constant (IBC) en el Museo de Astronomía y Ciencias Afines (MAST) y las modificaciones y nuevas propuestas para el Programa de Visita Escolar Programada (VEP) a través de un aparato especialmente construido con el cual se puede percibir el cielo en una latitud próxima a la de Rio de Janeiro.

  1. Historia de vidas de profesoras de ciencias: Hacia una ensenanza cientifica de calidad

    NASA Astrophysics Data System (ADS)

    Vega Osorio, Melba

    The purpose of this research was to capture the memories, practices, thoughts and philosophies of education that four experienced Science teachers have accumulated through the years. The life story qualitative research design was used in order to collect more meaningful information from the participants amenable to in depth analysis and interpretation. The life stories interviews were conducted using an interview protocol especially designed for the study. The interviews were recorded and transcribed. The questions that guided this research are: 1. What are the meanings that science teachers give to their educational practices? 2. How did the life experiences of the participants contribute to their success as science teachers? 3. How did the participants' educational practices change and evolve over time? 4. What does teaching science mean in the life of the participants? 5. Which reflections arise from the work of the participants that impact the teaching of science? 6. What are the participants' conceptions about teachers' professional development? 7. What are the participants' contributions to the field of scientific education? Wolcott's (1994) DAI analytical model was used for the analysis of the information and the narratives were written following the three dimensions of the model: description, analysis and interpretation. According to the life stories of the participants, being a teacher requires more than teaching the content. To be a successful and an exemplary science teacher, they have to live the teaching vocation, with dedication, passion, commitment and love for teaching, for students and science; teachers have to give their best for the students, even if it means making personal sacrifices; they should keep updated in knowledge (content) and in educational innovations (strategies); emphasizing both the theoretical and the practical aspects in the field of science, and being an inspirational guide for students.

  2. Ciencia en "Nepantla": The Journey of "Nepantler@s" in Science Learning and Teaching

    ERIC Educational Resources Information Center

    Aguilar-Valdez, Jean R.; LópezLeiva, Carlos A.; Roberts-Harris, Deborah; Torres-Velásquez, Diane; Lobo, Gilberto; Westby, Carol

    2013-01-01

    This paper presents a new approach to science education that takes a path through sociocultural theory and into the ideas of Gloria Anzaldúa. We apply Anzaldúan theory to science education by illustrating it in action through various examples which explore the multidimensionality of teaching science with Latin@ students in various contexts…

  3. A Integracao de Ensino das Ciencias da Saude (An Integrated Medical Education Program [in Brazil]).

    ERIC Educational Resources Information Center

    Pourchet-Campos, M. A.; Guimaraes Junior, Paulino

    At the Sixth Annual Reunion of the Brazilian Association of Medical Schools (VI Reuniao Anual da Associacao Brasileira de Escolas Medicas) leaders in the Brazilian medical profession proposed an integrated educational program for training students in the fields of medicine and public health. Under Brazil's present system of education, all…

  4. Libros de Ciencias en Espanol (A Selection of Recent Science Trade Books in Spanish)

    ERIC Educational Resources Information Center

    Schon, Isabel

    2005-01-01

    Teachers who have Spanish-speaking students in their science class, will likely be interested in learning about the recent releases of Spanish trade books for children. From appealing paperback series about colors, opposites, shapes, and numbers to smooth Spanish renditions of Isaac Asimov's engaging overview of the universe, these books are just…

  5. Libros, de Ciencias en Espanol (A Selection of Trade Books in Spanish).

    ERIC Educational Resources Information Center

    Schon, Isabel

    2002-01-01

    Lists a selection of trade books written in Spanish for young readers. Books are categorized under the headings For the Very Young, Biology, Ecology, General Science, Physical Science, and Technology. (YDS)

  6. "Libros de Ciencias en Espanol": A Selection of Recent Science Trade Books in Spanish

    ERIC Educational Resources Information Center

    Schon, Isabel

    2009-01-01

    Simple, lively, and easy-to-understand science books in Spanish for the very young are the new reality in the publishing world. In contrast to previous years where there has been a wider selection of books for beginning, middle, and advanced readers, today publishers in the United States (with a few exceptions) seem to be concentrating on books…

  7. Libros de Ciencias en Espanol: A Selection of Recent Science Trade Books in Spanish.

    ERIC Educational Resources Information Center

    Schon, Isabel

    2001-01-01

    Introduces a list of trade books written in Spanish that can be used for science education. Categorizes the list under five headings for the very young, biology, general science, physical science, and technology. (YDS)

  8. Nuevas Tendencias en la Ensenanza de las Ciencias (New Trends in Science Education).

    ERIC Educational Resources Information Center

    Oficina Regional de Educacion de la Unesco para America Latina y el Caribe, Santiago (Chile).

    The concern for improving science education in Latin America is reflected in this document compiled by UNESCO offices in Chile, Uruguay, and Paris with financial support from UNICEF, and directed to Latin American science teachers. The first part deals with planning the reforms needed in science education and the practical considerations involved.…

  9. Como Ayudar a sus Hijos a Aprender Ciencia (Helping Your Child Learn Science).

    ERIC Educational Resources Information Center

    Paulu, Nancy; Martin, Margery

    Because most parents say they do not or cannot help their children with science, this booklet was designed to help them do so, easily and with pleasure for both parent and child. The introduction presents information on why and how parents should help their children and provides a general orientation to the ideas and activities offered in the…

  10. Prueba de Ciencia Primer Grado (Science Test for the First Grade). [In Spanish

    ERIC Educational Resources Information Center

    Puerto Rico State Dept. of Education, Hato Rey.

    This document consists of three parts: (1) a manual for administering the science test to first graders (in Spanish), (2) a copy of the test itself (pictorial), and (3) a list of expected competencies in science for the first three grades (in English). The test consists of 25, four-choice items. For each item, the administrator reads a statement…

  11. Que es la Ciencia? What Is Science? A Question for All Students.

    ERIC Educational Resources Information Center

    Spurlin, Quincy; Blanco, George

    This teacher's guide offers classroom techniques for teaching science to bilingual elementary students. Recommendations are made for improving teaching by: lowering students' affective filters; providing comprehensible input; providing for language output; creating a supportive environment; adjusting classroom teaching style; teaching…

  12. An Invited Preface for the Following Book: Astrobiologia, Uma Ciencia Emergente

    NASA Technical Reports Server (NTRS)

    Rothschild, Lynn J.

    2016-01-01

    Since the dawn of civilization, we have beheld at the beauty and wonder of the natural world around us and wondered how it came to be. We have pondered the past, and have been intrigued about the future. For this we are unique. Our ancestors looked to the vastness of space and thought surely there are others out there. We are now at a new time in human history where we can address these age-old questions with a scientific approach and study rigorously the three big questions of astrobiology: Where do we come from? Where are we going? and Are we alone? These fundamental questions of astrobiology correspond to those of humanity, and arguably, what makes us human. And so we cannot help but be drawn to the field. Unlike other scientific disciplines, Astrobiology draws on the latest advances in a multitude of fields, from evolutionary and molecular biology, to prebiotic and interstellar chemistry, from astrophysics to astronomy, with a healthy dose of earth and planetary science. Astrobiology is in reality a "metadiscipline" drawing on useful science wherever it is to be found. From a practical point of view, this endeavor requires the interaction of scientists who might not normally meet each other, much less work on a common research project. And, unlike most other scientific disciplines, Astrobiology has implications for how we see ourselves, and how we interact with the earth and beyond. "Where do we come from" touches on the "why" questions that have intrigued not just scientists but philosophers and theologians. "Where are we going" adds to these an economic and political involvement that is currently being played out with discussions of climate change. "And are we alone" will someday force us to face the fact that we as living creatures are not unique, or perhaps that we are utterly alone in the universe, the result of a chemical history that was so improbable as to result in a sample size of one. Either result will force ethical considerations of either "the other" and their relationship to us, or our solitude and thus responsibility as the only life form in our cosmos. So what is Astrobiology? Let's start with the "Where do we come from?" A biologist will approach this looking at the evolution of life on earth, using such traditional tools as comparative anatomy and paleontology and newer tools such as molecular techniques. But this doesn't address why this happened the way it did without a comprehensive understanding of the environment. What was the temperature at such and such a time? Was the earth in a snowball phase or being bombarded by meteorites -- or even just a single large, well-placed one such as struck off the Yucatan peninsula 65 million years ago. This event could not have been predicted by population genetics alone, yet it had the most profound influence on our evolution as without it, we could still be in a world dominated by dinosaurs with the mammals cowering under cover. But it is not enough to go back to LUCA, the Last Universal Common Ancestor of all extant life. One must go back to the dawn of life. How did life arise? What was the environmental backdrop that allowed it to happen? How did we happen to end up with a habitable planet? Indeed, what is the origin and evolution of our solar system, galaxy, biogenic elements all the way back to the Big Bang. The "Where are we going?" tends to be ignored in many astrobiology programs, but in fact this is of the most immediate importance to us. Whereas the past was dominated by physical and chemical processes, and organismal interactions, the future has a new major player: us. While we probably don't have the power (yet) to stop our galaxy passing through another, or even reset the sun or stop the movement of the moon away from the earth, all of these things will influence the future of life on earth. We are already proving that we have the power to visit other bodies in our solar system, either with humans or our robotic surrogates. We are changing our atmospheric composition and thus our climate. We have the power to render species extinct, including our own. But we also have the power to use these tools for the common good, to extend our lifetimes and reclaim our rivers and forests. Which will it be? And then there is the question where science fiction becomes a reality: "Are we alone?" While many people are anxious to find signs of intelligent life out there, such a creature may not share either our curiosity or values. But what if there was a beneficent alien civilization that could communicate with us, perhaps forging a mutual understanding? More likely in the forseeable future is finding a small life, less evolved, life form. Note I did not use the word "simple" as there is nothing "simple" about life, ever. Which brings us back to the question: what is life? So where does Brazil come in? For nearly a decade there has been interest in a Brazilian astrobiology program, from a small side meeting held by the Brazilian Exobiology Program (BEP) of the Brazilian National Research Council, held in Rio de Janeiro, Brazil, on August 12, 2009, in association with the IAU Assembly to subsequent workshops held in several locations and membership of the Brazilian program in the NASA Astrobiology Institute (NAI). Each time I go to Brazil, I am impressed by the enthusiasm of the community, both scientific and student, the latter an excellent omen for the future of astrobiology in Brazil. Facilities are being built to supplement the natural laboratories that Brazil is blessed to have. In my own lab I have been privileged to have a wonderful Brazilian postdoctoral fellow, Dr. Ivan Paulino-Lima, resulting in a daily reminder of the program. I am honored to have been part of the development of astrobiology in Brazil, and hope that this relationship will continue to flourish. Clearly to advance astrobiology needs new knowledge, a reorganization of that which is known, and space missions. To help the reader join on this quest, what follows is a buffet of topics that will allow the reader to nibble on the richness that is Astrobiology. And, like a fabulous meal, it should make you want more. Welcome to Astrobiology.

  13. La Ciencia y el Laboratorio Científico de Marte

    NASA Video Gallery

    el robot más nuevo fabricado para Marte es el Laboratorio Científico de Marte o Curiosity. ¡Se encuentra listo para deambular por el planeta rojo con el mayor y más avanzado conjunto de instrumento...

  14. Ciencia en Nepantla: the journey of Nepantler@s in science learning and teaching

    NASA Astrophysics Data System (ADS)

    Aguilar-Valdez, Jean R.; LópezLeiva, Carlos A.; Roberts-Harris, Deborah; Torres-Velásquez, Diane; Lobo, Gilberto; Westby, Carol

    2013-12-01

    This paper presents a new approach to science education that takes a path through sociocultural theory and into the ideas of Gloria Anzaldúa. We apply Anzaldúan theory to science education by illustrating it in action through various examples which explore the multidimensionality of teaching science with Latin@ students in various contexts including dual language settings. We present what it is to journey through transformation using examples from educators at various levels of science within the world of teaching science with Latin@ students in the U.S. Our examples illustrate how Latin@ students cross many cultural borders in Spanish, English, Latin@ home culture, school culture, and the world of scientific dialogue and content, and in doing so, go through tensions and transformations between dominant and non-dominant worlds, which should be acknowledged and better understood through Anzaldúan theory. Fundamentally, we present a transformative notion of Latin@ science learning as "living on the bridges" of many dialogic and cultural practices, and having to negotiate these in-between spaces, or " nepantla" (Anzaldúa and Keating in Interviews, Psychology Press, London, 2000), where Latin@ students must contend with the fragmented and sometimes painful struggle of living in racialized reality amidst the demands of a dominant culture, and where transformation and healing are possible through the path of conocimiento. We advocate for teachers to become science teacher nepantler@s, who guide their students through nepantla, and into a new mestiz@ consciousness of science education.

  15. Actitudes y practicas educativas hacia la inclusion de estudiantes con impedimentos en la ensenanza de Ciencia

    NASA Astrophysics Data System (ADS)

    Vargas Rodriguez, Mayra

    This research is about the attitudes and educational practices towards inclusion of students with disabilities in science classroom. Four research questions were raised: (1) What are the attitudes of science teachers about the inclusion of students with disabilities?, (2) What is the relationship between attitudes and teachers demographics characteristics?, (3) What are the factors that influence the attitudes of science teachers? and (4) What does the Science teachers do in their educational practices to teach students with disabilities? A mixed design of two phases was performed to answer this question. In the first phase a questionnaire was submit to 79 Science teachers from the middle and high school level. This questionnaire with the title Attitudes and educational practices towards inclusion of students with disabilities in Science teaching was developed by the researcher. In the second phase a focus group was conducted with Science and Special Education teachers. Also, two structured interviews by telephone were conducted. The findings indicate that the attitudes of science teachers who participated in the first phase of this research seems to be neutral. However, in their responses to the interview or focus group the attitudes were perceived negative. This attitudes are influences by a number of factors that hinder the process of inclusion. Using a nonparametric test with a chi-square test, it was determined that the number of students in a classroom is one of the factors that have a significant relationship with attitudes. The modifications that Science teachers do in their educational practices these will depend on the discapacities. But usually the modification will be in the evaluation of the students. Using assessments as a technique. Also, individualized instruction and peers are educational practices that highlight.

  16. Nominalizations in Spanish. Studies in Linguistics and Language Learning, Volume V.

    ERIC Educational Resources Information Center

    Falk, Julia Sableski

    Using methods developed in transformational generative grammar, three types of nominal constructions in Spanish are treated in this paper: Fact nominalizations ("[El] Escribir es agradable"), Manner nominalizations ("El tocar [de la mujer] es agradable"), and Abstract noun nominalizations ("La construccion rapida de esta escuela es dudosa"). While…

  17. Counter-Narratives of La Raza Voces: An Exploration of the Personal and Professional Lived Experiences of Mexican-American/Chicana/o Faculty at California Catholic Institutions of Higher Education

    ERIC Educational Resources Information Center

    Serrano, Frank V.

    2013-01-01

    Faculty members of color time and again encounter the greatest number of challenges and barriers (e.g., discrimination, isolation, marginalization, tokenism, inundated with workloads and service commitments, devalued research, and delayed promotion and tenure) in both entering academia and succeeding within academia. The purpose of this study was…

  18. Mixed-Methods Study that Examines Nine Science Teachers' Perceptions of Slooh Robotic Telescope for Teaching Astronomy. (Breton Title: Métodos Mistos de Estudo que Examinam a Percepção de Nove Professores de Ciências sobre o Telescópio Robótico Slooh Para Ensino de Astronomia.) Métodos Mixtos de Estudio que Examinan la Percepcion de Nueve Profesores de Ciencias sobre EL Telescopio Robótico Slooh Para la Enseñanza de la Astronomía

    NASA Astrophysics Data System (ADS)

    Gershun, Daniel C.; Slater, Timothy F.; Berryhill, Katie J.

    2014-07-01

    ção em sala de aula", "Impacto no Instrutor" e "Questões logísticas". A análise desses temas sugere que Slooh pode proporcionar um ambiente de aprendizagem interativo e social com capacidade de incorporar temas interdisciplinares. Aunque estudios previos muostraron que los telescopios robóticos tienen el potencial de mejorar el aprendizaje del estudiante, hay relativamente poca investigación centrada en las percepciones de lós profesores respecto de esta tecnología. Este estudio investiga: "¿cuál es el mérito académico de la utilización de telescopios robóticos SLOOH para enseñar astronomía según la percepción de los profesores de ciências?" Nuestra muestra está formada por nueve profesores de ciencias de estudiantes entre 13 a 18 años pre-y post-tests, entrevistas, y. encuestas se recogieron durante dos semanas de un curso on-line de verano sobre los telescopios robóticos. Si bien lós tests antes y después de las pruebas no revelaron un aumento estadísticamente significativo en el conocimiento de contenido astronómico, el análisis de lós datos cualitativos reveló cinco temas que describen los aspectos más importantes de la utilización de SLOOH de acuerdo con los participantes:. "Imágenes", "Interface", "aplicación en el aula", "Impacto en el Instructor" y "problemas logísticos" . El análisis de estos temas sugiere que SLOOH puede proporcionar un ambiente de aprendizaje interactivo y social, con capacidad para incorporar temas transversales.

  19. "Palabras de la ciencia": Pedro Castera and Scientific Writing in Mexico's Fin de Siècle

    NASA Astrophysics Data System (ADS)

    Blanco, María del Pilar

    2014-03-01

    This essay explores the career of the understudied writer Pedro Castera (1846-1906), who is regarded as one of the first practitioners of science fiction in Mexico. A man of many talents, Castera is one of the most eccentric and eclectic figures in the intellectual life of fin-de-siècle Mexico City. His career took many turns: While during specific periods he devoted himself to writing and participating within the liberal, cosmopolitan culture of Mexico City, he often disappeared from the public eye to devote himself to the development of inventions in the mining industry. The essay discusses the different meanings of `invention' within Castera's oeuvre, namely poetic and scientific innovation. Setting these two concepts within the domains of literature and scientific writing in the global and local fin de siècle, the essay investigates how Castera's journalism and fiction (specifically his 1890 novel Querens) are representative of the wider question of scientific development in Mexico and Latin America as a whole during the nineteenth century. Furthermore, it explores the intersections of aesthetics and science during a critical period of modern intellectual history, in which these two areas of knowledge were gradually defining themselves as two distinctive cultures.

  20. "Palabras de la Ciencia": Pedro Castera and Scientific Writing in Mexico's "Fin de Siècle"

    ERIC Educational Resources Information Center

    del Pilar Blanco, María

    2014-01-01

    This essay explores the career of the understudied writer Pedro Castera (1846-1906), who is regarded as one of the first practitioners of science fiction in Mexico. A man of many talents, Castera is one of the most eccentric and eclectic figures in the intellectual life of fin-de-siècle Mexico City. His career took many turns: While during…

  1. Compartiendo la Ciencia con los Ninos: Una Guia para los Padres (Sharing Science with Children: A Guide for Parents).

    ERIC Educational Resources Information Center

    North Carolina Museum of Life and Science, Durham.

    This guide offers Spanish-speaking parents ways in which they can help their children learn about science at home and in the community. Science is a way of looking at the world. It uses everyday techniques such as observation and classification to give us information about things and how they work. Advice to parents that want to support their…

  2. Ciencias en Espanol, 1995-96 (Sciences in Spanish, 1995-96). Research Report on Educational Grants.

    ERIC Educational Resources Information Center

    Houston Independent School District, TX. Dept. of Research and Evaluation.

    An elementary science program was taught in Spanish for English-speaking children to give them the opportunity to acquire second language skills through hands-on science instruction. The program included 4 classes of approximately 22 students at kindergarten and first-grade levels in the gifted and talented program at the Gary Herod Elementary…

  3. Educacion en Ciencia, Tecnologia y Sociedad: Teoria y Practica (Education in Science, Technology, and Society: Theory and Practice).

    ERIC Educational Resources Information Center

    Pena Borrero, Margarita, Ed.

    This volume compiles Spanish translations of seven articles on different aspects of Science, Technology and Society Education. The papers, originally written in English, were used during the first in-service training seminar for high school science teachers, which took place in Mayaguez under (Puerto Rico) joint sponsorship of the National…

  4. Manual para los Profesores de Ciencias. (Science Teachers' Handbook). Appropriate Technologies for Development Series Reprint R-66.

    ERIC Educational Resources Information Center

    Rao, C. S., Ed.

    Science should not be presented as a collection of facts; it must be presented as an active dynamic subject. It should be used to stimulate young minds and encourage questioning. This is a publication designed to meet the needs of science teachers for a day-to-day reference in science. It was intended for the use of Peace Corps volunteers and…

  5. Educacion y Ciencias Sociales en el Mundo Moderno. [Education and the Social Sciences in the Modern World].

    ERIC Educational Resources Information Center

    Rimoldi, Horacio J. A.

    The document, written in Spanish, discusses the relationship between research in the social sciences and the role of the university in social science education. The author considers the education of researchers, the application of research, the need for interdisciplinary research methods, and problems involved in cross-cultural studies. He states…

  6. Viva La Ciencia: Cuba’s Creative Scientists Aim to Make Knowledge Their Country’s Sugar Substitute

    NASA Astrophysics Data System (ADS)

    Reid, Rosalind; Hayes, Brian

    At first, peas served as particles in Ernesto Altshuler's experiment. A mechanical dispenser would drop the chícharos one by one into the space between two glass plates, forming a tidy two-dimensional approximation of a sand pile. Lattice structure appeared, then vanished, as the pile self-organized and went critical—avalanche! But Havana's insects soon found the peas in Altshuler's physics lab. For a physicist working under harsh economic conditions of Cuba in the early 1990s, options were few. Yet Altshuler's solution came as a byproduct of the crisis: Because of fuel shortages, the country had begun importing Chinese bicycles, and ball bearings were available in abundance. Thus the peas have been replaced by steel beads, but Altshuler and his students still call their machine the chícharotron.

  7. El uso de las simulaciones educativas en la ensenanza de conceptos de ciencias y su importancia desde la perspectiva de los estudiantes candidatos a maestros

    NASA Astrophysics Data System (ADS)

    Crespo Ramos, Edwin O.

    This research was aimed at establishing the differences, if any, between traditional direct teaching and constructive teaching through the use of computer simulations and their effect on pre-service teachers. It's also intended to gain feedback on the users of these simulations as providers of constructive teaching and learning experiences. The experimental framework used a quantitative method with a descriptive focus. The research was guided by two hypothesis and five inquiries. The data was obtained from a group composed of twenty-nine students from a private Metropolitan University in Puerto Rico and elementary school pre-service teachers. They were divided into two sub-groups: experimental and control. Two means were used to collect data: tests and surveys. Quantitative data was analyzed through test "t" for paired samples and the non-parametric Wilcoxon test. The results of the pre and post tests do not provide enough evidence to conclude that using the simulations as learning tools was more effective than traditional teaching. However, the quantitative results obtained were not enough to reject or dismiss the hypothesis Ho1. On the other hand, an overall positive attitude towards these simulations was obtained from the surveys. The importance of including hands-on activities in daily lesson planning was proven and well recognized among practice teachers. After participating and working with these simulations, the practice teachers expressed being convinced that they would definitely use them as teaching tools in the classroom. Due to these results, hypothesis Ho2 was rejected. Evidence also proved that practice teachers need further professional development to improve their skills in the application of these simulations in the classroom environment. The majority of these practice teachers showed concern about not being instructed on important aspects of the use of simulation as part of their college education curriculum towards becoming teachers.

  8. Evidence of Critical Thinking in High School Humanities Classrooms (Evidencias del Pensamiento Crítico en las Clases de Ciencias Humanas en Bachillerato)

    ERIC Educational Resources Information Center

    Alfonso, David Vargas

    2015-01-01

    Critical thinking skills (CTS) are a group of higher order thinking abilities related with complex processes of learning like contextualization or problem solving. This exploratory research study identified whether critical thinking skills were present in high school humanities classrooms. The study was carried out in a private school in Bogotá,…

  9. NOMENCLATURAL NOTES ON THE EURYTOMIDS (CHALCIDOIDEA: EURYTOMIDAE) DESCRIBED BY JEAN BRÈTHES HOUSED IN MUSEO ARGENTINO DE CIENCIAS NATURALES “BERNARDINO RIVADAVIA”

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Nine species parasitic eurytomid wasps described by Jean Brèthes and deposited in the National Insect Collection of Argentina, Buenos Aires are treated and their nomenclature stabilized. The condition of the type material is described. Lectotypes are designated for Prodecatoma parodii, Eudecatoma o...

  10. La ciencia en la vida actual. Volumen III. Edicion para el maestro (Science in Everyday Life. Volume III. Teacher Edition). Applied Basic Curriculum Series.

    ERIC Educational Resources Information Center

    Evaluation, Dissemination and Assessment Center, Dallas.

    This guide, the third in a series of three, provides the Spanish-speaking intermediate science student and teacher an opportunity to review selected science concepts and processes through activities which emphasize the applicability of scientific knowledge in the professional world. The three components in this guide deal with (1) the scientific…

  11. Guia para la Ensenanza Combinada de Ingles y Ciencia. Para Padres/sobre Padres. (A Guide to Teaching English and Science Together. For Parents/about Parents).

    ERIC Educational Resources Information Center

    Schwartz, Wendy

    In the past, students who knew only a little English (called limited English proficient, or LEP), were usually taught only low-level science and mathematics. Now, new science and mathematics teaching methods can help LEP students get a good education in both fields. This guide will help parents know if their children are learning as much as…

  12. Learning Partners: Escribamos! Leamos! Juguemos a las Ciencias! Juguemos a las Matematicas! (Learning Partners: Let's Write! Let's Read! Let's Play Mathematics! Let's Play Science!)

    ERIC Educational Resources Information Center

    Office of Educational Research and Improvement (ED), Washington, DC.

    This Spanish-language document consists of four single-sheet sets of guidelines developed by the Family Involvement Partnership for Learning to assist parents in facilitating their children's elementary school success. The front part of the sheets describes general ways parents can support their children, including modeling writing, reading aloud,…

  13. La ciencia en la vida actual. Volumen I. Edicion para el maestro (Science in Everyday Life. Volume I. Teacher Edition). Applied Basic Curriculum Series.

    ERIC Educational Resources Information Center

    Evaluation, Dissemination and Assessment Center, Dallas.

    This guide, the first in a series of three, provides the Spanish-speaking intermediate science student and teacher an opportunity to review selected science concepts and processes through activities which emphasize the applicability of scientific knowledge in the professional world. The three components in this guide deal with (1) ecology (what…

  14. Reformulation of Engineering Education at Undergraduate Level in the Faculdad de Ingenieria y Ciencias Hidricas Universidad Nacional del Litoral--Water Resources and Engineering Degrees.

    ERIC Educational Resources Information Center

    Theiler, Julio; Isla, Miguel; Arrillaga, Hugo; Ceirano, Eduardo; Lozeco, Cristobal

    This paper explains the educational changes in the Water Resources Engineering program offered by the Universidad Nacional del Litoral in Santa Fe, Argentina, for the last 20 years at the undergraduate level. The need for modernizing the engineering teaching program occurred due to changes in the social system in which the concepts of development…

  15. Ciencia Marina/Negocio y Oficina. Libro del Profesor (Marine Science/Business & Office. Teacher's Guide). B7. CHOICE (Challenging Options in Career Education).

    ERIC Educational Resources Information Center

    Mid-Hudson Migrant Education Center, New Paltz, NY.

    Written in Spanish, the guide comprises the sixth grade unit of a career education curriculum for migrant students. The unit covers 10 marine science, business, and office occupations: hydrographer, marine biologist, fish hatchery technician, boat builder, commercial diver, clerical worker, actuary, cashier, assistant bank manager, and computer…

  16. Indice Bibliografico Ciencias de la Educacion. Ano 1988. Volume II No. 1. (Bibliographic Index of the Education Sciences. 1988. Volume II No.1).

    ERIC Educational Resources Information Center

    Centro de Investigacion, Madrid (Spain). Servicio de Documentacion.

    Published quarterly, this annotated bibliography indexes articles from scholarly Spanish journals, as well as significant foreign journals, considered important in the field of education. References are organized alphabetically according to subject and within each subject by number, author, and content. A users' information description is provided…

  17. La ciencia en la vida actual. Volumen II. Edicion para el maestro (Science in Everyday Life. Volume II. Teacher Edition). Applied Basic Curriculum Series.

    ERIC Educational Resources Information Center

    Evaluation, Dissemination and Assessment Center, Dallas.

    This guide, the second in a series of three, provides the Spanish-speaking intermediate science student and teacher an opportunity to review selected science concepts and processes through activities which emphasize the applicability of scientific knowledge in the professional world. This guide is divided into three components. The first component…

  18. [The case of the 'lowlife': perceptions of danger and the prevention of disreputable behaviors in theRevista de Criminología, Psiquiatría, Medicina Legal y Ciencias Afinesin Buenos Aires, 1914-1923].

    PubMed

    Dovio, Mariana

    2013-11-30

    We analyze the construction of the notion of the 'lowlife' in the city of Buenos Aires in the Revista de Criminología, Psiquiatría y Medicina Legal, from 1914-1923. We shall analyze the notion of 'lowlife', meaning behaviors situated in a border zone between crime and madness, from the point of view of prevention and perception of danger. The first way of analyzing the 'lowlife' examines institutional projects that were related to eugenics and that advocated preventive detention of dangerous people, 'alcoholists' and vagrants. The second involves identifying in moral and physical terms the kind of people who were targeted in the creation of intervention projects for those considered to be 'lowlifes', who could potentially damage the fabric of society in some way. PMID:24346199

  19. A Pos-Graduacao Nas Ciencias Humanas e o Paradigma da Medicina: A Era da Especializacao. (Post-Graduation in the Human Sciences and the Paradigm of Medicine: The Era of Specialization.)

    ERIC Educational Resources Information Center

    Costa, Celio Juvenal

    2000-01-01

    Reflects on the current tendency in Brazilian higher education for greater and greater specialization, particularly in human sciences and in medicine. Calls for less specialization and a more historic and general preparation, especially in teacher education. (BT)

  20. La Materia. Nivel II. Basado en el curso de estudios de Ciencia de Montgomery County Public Schools. (Matter. Level II. Based on the Montgomery County Public Schools Science Studies Program).

    ERIC Educational Resources Information Center

    Gerstman, M. Linda

    This curriculum unit is for use in an elementary school foreign language immersion program in Montgomery County, Maryland. The unit is geared toward the second grade science classroom. It includes instructional and performance objectives, vocabulary lists, optional language structure sections, illustrations, activities, evaluation suggestions, and…

  1. Como Promover el Exito de las Ninas y las Minorias en las Ciencias y en las Matematicas. Para Padres/sobre Padres (How To Promote the Science and Mathematics Achievement of Females and Minorities. For Parents/about Parents).

    ERIC Educational Resources Information Center

    Schwartz, Wendy

    Some minority and female students traditionally have not been given the help they need to enroll and succeed in mathematics and science classes. Now, however, various approaches are available to give these students the extra attention they need. Parents can help children develop an interest in science and mathematics by: (1) identifying role…

  2. Caracteristicas de los Estudiantes de Ciencias Agricolas y de Economia Domestica de la Universidad de Puerto Rico (Characteristics of the Agricultural Science and Home Economics Students of the University of Puerto Rico). Publicacion 135.

    ERIC Educational Resources Information Center

    Lube, Edna Droz; Calero, Reinaldo

    As part of a U.S. Department of Agriculture research project on young adults, a questionnaire was distributed in the fall of 1977 to all agriculture science and home economics students at the University of Puerto Rico in order to determine their personal and parental backgrounds; work, college, and high school experiences; life goals and attitudes…

  3. Seres Vivos. Nivel I. Basado en el curso de estudios de Ciencia de Montgomery County Public Schools. (Living Beings. Level 1. Based on the Montgomery County Public Schools Science Studies Program).

    ERIC Educational Resources Information Center

    Senger, Graciela

    This curriculum unit, developed by the Montgomery County Public Schools, Maryland, was designed for use in the elementary level foreign language immersion program. It is geared toward the first grade science classroom. The unit includes instructional and performance objectives, necessary vocabulary lists, optional language structure sections,…

  4. Organizing MySpace: Youth Walkouts, Pleasure, Politics, and New Media

    ERIC Educational Resources Information Center

    Yang, K. Wayne

    2007-01-01

    While the major urban centers around the country were flooded by millions of protesters demanding immigrant rights in March 2006, the San Francisco Bay Area remained relatively quiet. A coalition of organizers, including Centro Legal de la Raza, Deporten A La Migra, and the Bay Area Immigrant Rights Coalition mobilized a one-week hunger strike,…

  5. Chicanas/os and Latinas/os Crossing Institutional Fronteras: Critical Race Counterstories along the College Transfer Pipeline at a Sacramento Valley Community College

    ERIC Educational Resources Information Center

    Ramirez, Richard Andrew

    2011-01-01

    Chicanos and Latinos constitute the fastest-growing ethnic group in the United States, with the California public school system reporting a definitive majority (50.4%) of Raza students in 2010, and California community colleges (CCCs) approaching record one-third Chicano/Latino enrollments in the last five years. Since CCCs are the entry point to…

  6. For My Children: Mexican American Women, Work, and Welfare. Focus Study Report #2.

    ERIC Educational Resources Information Center

    Quiroz, Julia Teresa; Tosca, Regina

    This is the final report of the National Council of La Raza's (NCLR) Focus Study examining the opinions, attitudes, and needs of Mexican American single women, relating to implementation of national welfare reform legislation. Over a 2-year period NCLR staff held focus groups with Mexican American women in four communities: Phoenix, Arizona; Mora,…

  7. Plugged in: Positive Development Strategies for Disconnected Latino Youth. A Report of the NCLR Escalera Program

    ERIC Educational Resources Information Center

    Hageage, Ana

    2011-01-01

    This report profiles the National Council of La Raza (NCLR) Escalera Program: Taking Steps to Success, a Latino-serving, community-based youth workforce development program, which was developed in 2001 in partnership with the PepsiCo Foundation and PepsiCo, Inc. and expanded in 2008 with the support of Shell Oil Company. The Escalera Program:…

  8. Issue Update: An Overview of the Immigration Reform Act.

    ERIC Educational Resources Information Center

    Kamasaki, Charles; Briceno, Rose

    An overview of the Immigration Reform and Control Act of 1986 summarizes legislative developments prior to passage of the bill, describes major elements of the legislation, discusses the activities of the National Council of La Raza in monitoring implementation of the law, and emphasizes the necessary role of the network of Hispanic…

  9. Investing in Boys and Young Men of Color: The Promise and the Opportunity. Issue Brief: Focus on Education

    ERIC Educational Resources Information Center

    Bird, Kisha; Bryant, Rhonda

    2014-01-01

    This policy brief was prepared for the "Investing in Boys and Young Men of Color: The Promise and Opportunity" briefing held in June 2014 that was co-sponsored by National Council of La Raza, PolicyLink, the Executive Alliance to Expand Opportunities for Boys and Young Men of Color, and the Institute for Black Male Achievement. The…

  10. Rimas Tontas. (Nonsense Rhymes)

    ERIC Educational Resources Information Center

    Galarza, Ernesto

    Part of the series "Coleccion Mini-Libros" (Mini-Book Collection), the booklet is a compilation of 50 short nonsense verses written in Spanish. The author and The Southwest Council of La Raza offer the collection for the use of parents and teachers dedicated to stimulating interest in Spanish among the youth of our country. (EJ)

  11. Educator-Lawyer Conference Report (Albuquerque, New Mexico, October 17, 1973).

    ERIC Educational Resources Information Center

    Casso, Henry J., Comp.; Esquibel, Antonio, Comp.

    Sponsored by the National Task Force de la Raza, the conference was attended by prominent lawyers and educators from throughout the United States. The conference was an "exploratory" or "brainstorming" session, designed to identify key issues and to lay the groundwork for techniques and strategy of dealing with various problems. Purpose of the…

  12. Project EXCEL. Statement of Lori S. Orum, Director, and Lucie Barron, Education Specialist, before the President's Task Force on Hispanic Education, Los Angeles. Regional Hearing.

    ERIC Educational Resources Information Center

    National Council of La Raza, Los Angeles, CA. Program Office.

    Project EXCEL, a community educational leadership demonstration project sponsored by the National Council of La Raza and its over 123 affiliated community-based organizations, is a major educational initiative to improve the educational attainment of Hispanic Americans by working with local communities to develop and demonstrate effective…

  13. Speaking Out Loud: Conversations with Young Puerto Rican Men.

    ERIC Educational Resources Information Center

    Perez, Sonia M.; Cruz, Steven

    The combination of poverty, inadequate attention, and the difficult period of young adulthood has serious implications for young Puerto Rican men. To draw attention to their strengths, needs, and status, the National Council of La Raza Poverty Project conducted a two-year community-based study on young Puerto Rican men and family poverty. This…

  14. Brown Country: Johnny Rodriguez

    ERIC Educational Resources Information Center

    Vargas, Deborah R.

    2007-01-01

    The year 1972 was part of a dynamic period of Chicano politics and cultural production in South Texas. A few years earlier, in the Crystal City Revolts, Tejanos had moved to gain control of city and school board positions, events that resulted in the creation of the Raza Unida Party in 1970. Nineteen seventy-two also marked the beginning of the…

  15. Developing Critical Consciousness: Resistance Literature in a Chicano Literature Class

    ERIC Educational Resources Information Center

    Acosta, Curtis

    2007-01-01

    Starting from a framework that emphasizes indigenous heritage, high school teacher Curtis Acosta and students in the Chicano/Raza Studies classes engage with literature that reflects the students' lives, families, and histories. Doing so encourages students to visualize and affirm academic identities while they confront current issues of…

  16. Perspectives on Chicano Education.

    ERIC Educational Resources Information Center

    Gonzales, Tobias, Ed.; Gonzales, Sandra, Ed.

    Written by Stanford University students, the 9 articles in this publication reflect student ideas on Chicano education. Their aim is to stimulate new ideas and discussion on Raza Education. The majority of the articles were written by students in the Department of Education and by students working toward a Ph.D. degree. Divided into 3 parts, the…

  17. Comunicado de prensa del Informe Anual sobre el Estado del Cáncer 2015

    Cancer.gov

    Por primera vez, los investigadores han usado datos a nivel nacional para determinar la incidencia de los cuatro subtipos moleculares principales de cáncer de seno (mama) por edad, raza y grupo étnico, nivel de pobreza y varios otros factores. El informe

  18. Committed to Unity.

    ERIC Educational Resources Information Center

    Frase-Blunt, Martha

    1992-01-01

    Proposes Raul Yzaguirre, President of the National Council of La Raza (NCLR), as a national leader for the Hispanic community. Addresses the need for unity among Hispanics and among minority groups. Summarizes Yzaguirre's career history and presents some criticism of the NCLR. Highlights issues such as the North American Free Trade Agreement, with…

  19. Mixing against culture vs mixing against nature: ontologization of prohibited interethnic relationships.

    PubMed

    Roncarati, Alessandra; Pérez, Juan A; Ravenna, Marcella; Navarro-Pertusa, Esperanza

    2009-02-01

    In this paper, we develop the theory of ontologization: Social representations that prevent members of minority and majority groups who are living in contact with each other to mingle. The process of ontologization consists of separating some humans from their own species, and anchoring them in another environment, that of an animal, for example. We propose that underlying the famous slogan "equal but separate" is the social representation of interracial mixing as a "counter-nature" phenomenon. It is predicted that a sexual relationship between people of different "races" leads to a greater degree of ontologization, and, as such, this miscegenation will be explained in terms of biologistic thinking, like an instinctive nature or atavistic animal impulse. An experiment (N = 360) features the case of a woman who, though already in a stable relationship, is unfaithful to her partner. In a 2×3 factor design, the ethnic-national identity of this woman (in-group: Spanish/Italian vs out-group: Senegalese) and the ethnic-national identity of her lovers (in-group: Spanish/Italian vs out-group: Rumanian vs out-group: Senegalese) were manipulated. In general, results fit the hypothesis of ontologization in interracial conditions better, rather than the customary in-group favouritism and/or out-group discrimination bias. We then go on to discuss the way in which a biologistic way of thinking enables a differentiation at the human level, in terms of culture groups and nature groups, in "races," so that an interracial sexual relationship is seen as evidence of a wild and irrepressible impulse, which stigmatizes the people involved in these relationships. This research was supported by the Italian/Spanish Integrated Action Program HI2004_0241 and the Spanish Ministerio de Ciencia y Tecnología BSO2003-00476/PSCE. Dans cet article, nous développons la théorie de l'ontologisation: des représentations sociales qui empêchent les membres des groupes minoritaire et majoritaire

  20. John McCain

    ERIC Educational Resources Information Center

    Phi Delta Kappan, 2008

    2008-01-01

    This article presents speeches describing John McCain's position on education posted on the McCain campaign's official web site, www.johnmccain.com. These include McCain's speech to LaRaza convention, July 14; McCain's speech to the NAACP, July 16; McCain's speech at the Greater Columbus (Ohio) Convention Center, May 15; and McCain's speech at…

  1. Food Additives Permitted for Direct Addition to Food for Human Consumption; Folic Acid. Final rule.

    PubMed

    2016-04-15

    The Food and Drug Administration (FDA or we) is amending the food additive regulations to provide for the safe use of folic acid in corn masa flour. We are taking this action in response to a food additive petition filed jointly by Gruma Corporation, Spina Bifida Association, March of Dimes Foundation, American Academy of Pediatrics, Royal DSM N.V., and National Council of La Raza. PMID:27101640

  2. [Chlamydia trachomatis infection in the cervix uteri].

    PubMed

    Rosas Arceo, J; Toca Porraz, L; Díaz Esponda, C; Nava Flores, J

    1993-11-01

    We studied 93 gynecological samples of uterine cervix of patients at Hospital de Gineco Obstetricia No. 3, Centro Médico La Raza, IMSS, Health Promotion and Family Medicine Unit No. 5 with monoclonal antibodies. We found Chlamydia trachomatis in 28.4% in women where the infection was suspected. We should think in infection by Chlamydia trachomatis in women with acute cervicitis, acute salpingitis, cervical abnormalities, and to run the specific tests for its detection. PMID:8288136

  3. Percepcion de los profesores universitarios acerca del concepto cultura cientifica y de sus implicaciones en el nuevo bachillerato del Recinto de Rio Piedras de la Universidad de Puerto Rico

    NASA Astrophysics Data System (ADS)

    Ramos Pastrana, Nilsa

    El Senado Academico del Recinto de Rio Piedras de la Universidad de Puerto Rico aprobo en el ano academico 2005-2006 la Certificacion 46, que contiene los lineamientos de un nuevo bachillerato. Este nuevo bachillerato introdujo cambios significativos en el curriculo tradicional. Entre ellos se encuentra la reduccion del componente de educacion general y el de Ciencias Biologicas en particular. La reduccion de creditos en el componente de Ciencias Biologicas ha obligado a reevaluar el concepto de cultura cientifica que desarrollan esos cursos. El proposito del estudio consistio en auscultar las percepciones de los profesores de las Facultades de Administracion de Empresas, Humanidades, Ciencias Sociales, Ciencias Naturales, Educacion y Estudios Generales del Recinto de Rio Piedras de la Universidad de Puerto Rico en torno al concepto de cultura cientifica, los contenidos disciplinares del curso de Ciencias Biologicas y la reduccion de creditos en el nuevo bachillerato. Las preguntas que guiaron la investigacion fueron: ¿cuales son las percepciones que tienen los profesores de las Facultades de Administracion de Empresas, Ciencias Sociales, Estudios Generales, Ciencias Naturales, Humanidades y Educacion, en torno al concepto de cultura cientifica y los contenidos disciplinares del curso de Ciencias Biologicas? ¿cuales son las percepciones que tienen los profesores de Ciencias Biologicas en torno al concepto cultura cientifica y los contenidos disciplinares del curso de Ciencias Biologicas? ¿existen diferencias significativas por facultad, genero, experiencia, rango y nombramiento en las percepciones que tienen los profesores del Recinto de Rio Piedras de la Universidad de Puerto Rico sobre los elementos que caracterizan la cultura cientifica y los contenidos biologicos que deben tener los egresados del Recinto? ¿que implicaciones curriculares tienen estos testimonios en el desarrollo del concepto de cultura cientifica en el nuevo bachillerato? Para realizar la

  4. Register of Education and Training Activities in Librarianship, Information Science and Archives = Inventaire des activites de formation dans le domaine de la bibliotheconomie, des sciences de l'information et de l'archivistique = Inventario de las actividades de formacion en la esfera de la bibliotecologia, las ciencias de la informacion y la archivologia.

    ERIC Educational Resources Information Center

    de Grolier, Eric, Comp.

    This register provides information on information science, librarianship, documentation, and archival science training activities conducted outside regular university courses organized by specialized schools. Based on a December 1980 UNESCO questionnaire survey, the register includes seminars, refresher courses, continuing education courses, and…

  5. Tabla de Especificaciones e Instructivo sobre Elaboracion de Pruebas Objetivas en la Ensenanza Primaria, para las asignaturas de Estudios Sociales, Idioma Espanol, Matematicas y Ciencias Naturales (Specification Tables and Instructions for the Construction of Objective Tests in the Primary Grades in Social Studies, Spanish, Mathematics, and Natural Sciences).

    ERIC Educational Resources Information Center

    Ministerio de Educacion, Guatemala City (Guatemala). Direccion de Bienestar Estudiantil y Educacion Especial.

    This booklet presents specification tables illustrating the relative importance given to topics on tests within a particular subject area. The general subject areas are social studies, Spanish, mathematics, and natural sciences. Tables are provided for final exams in each of these areas for several primary grades, illustrating the importance of…

  6. Associations Between Ethnic Labels and Substance Use Among Hispanic/Latino Adolescents in Los Angeles

    PubMed Central

    Unger, Jennifer B; Thing, James; Soto, Daniel Wood; Baezconde-Garbanati, Lourdes

    2014-01-01

    Self-identification with ethnic-specific labels may indicate successful ethnic identity formation, which could protect against substance use. Alternatively, it might indicate affiliation with oppositional subcultures, a potential risk factor. This study examined longitudinal associations between ethnic labels and substance use among 1,575 Hispanic adolescents in Los Angeles. Adolescents who identified as Cholo or La Raza in 9th grade were at increased risk of past-month substance use in 11th grade. Associations were similar across gender and were not confounded by socioeconomic status, ethnic identity development, acculturation, or language use. Targeted prevention interventions for adolescents who identify with these subcultures may be warranted. PMID:24779500

  7. Erratum: "Abundances of Planetary Nebulae in the Outer Disk of M31" (2012, ApJ, 753, 12)

    NASA Astrophysics Data System (ADS)

    Kwitter, Karen B.; Lehman, Emma M. M.; Balick, Bruce; Henry, R. B. C.

    2013-05-01

    Not Available Partially based on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium; and on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministerio da Ciencia e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

  8. Illuminating Cell Biology

    NASA Technical Reports Server (NTRS)

    2002-01-01

    NASA's Ames Research Center awarded Ciencia, Inc., a Small Business Innovation Research contract to develop the Cell Fluorescence Analysis System (CFAS) to address the size, mass, and power constraints of using fluorescence spectroscopy in the International Space Station's Life Science Research Facility. The system will play an important role in studying biological specimen's long-term adaptation to microgravity. Commercial applications for the technology include diverse markets such as food safety, in situ environmental monitoring, online process analysis, genomics and DNA chips, and non-invasive diagnostics. Ciencia has already sold the system to the private sector for biosensor applications.

  9. Production and quality assurance in the SIT Africa Mediterranean fruit fly (Diptera: Tephritidae) rearing facility in South Africa

    SciTech Connect

    Barnes, B.; Rosenberg, S.; Arnolds, L.; Johnson, J.

    2007-03-15

    esteriles de moscas para el proyecto de la tecnica del insecto esteril (TIE) en huertos de frutos y vinas comerciales en la provincia del Cabo Occidental del Sudafrica. El procedimiento de criar en masa fue en su mayor parte basado en los sistemas desarrollados por el Laboratorio de Agricultura y Biotecnologia de la FAO/IAEA, Seibersdorf, Austria. Un numero de razas que separara los sexos geneticamente fueron utilizadas para producir solo machos para la liberacion. La congestionada condicion inicial para criar las moscas y su manejo de calidad fueron aliviadas en 2001 con la construccion de un nuevo cuarto de cria para adultos y un laboratorio de control de calidad. En 2002, un Sistema de Manejo de Calidad comprensivo fue implementado, y en 2003 una raza mejorada que separa los sexos geneticamente, VIENNA 8, fue proveido por el Laboratorio de la FAO/IAEA en Seibersdorf. En la mayor parte de los primeros 3 anos la facilidad no pudo suplir el numero requerido de machos esteriles de la mosca mediterranea de la fruta para el programa de TIE sin la necesidad para importar machos esteriles de otra facilidad. Desde medio del ano de 2002, despues que el sistema de manejo de calidad fue implementado, la produccion y la calidad mejoraron pero aun quedaron por debajo del nivel optimo. Despues de la introduccion de la raza VIENNA 8 que separa los sexos geneticamente, y junto con el equipo mejorado de control de clima, la estabilidad y los parametros de seguridad de calidad mejoraron substancialmente. Los factores criticos que influyeron en la produccion y la calidad fueron la infraestructura inadecuada para criar las moscas, problemas con la calidad de la dieta para las larvas y la ausencia inicial de un sistema de manejo de calidad. Los resultados muestran claramente la importancia de un manejo efectivo de la calidad, el valor de una raza productiva que separa los sexos geneticamente y la necesidad de contar con una base solida de financimiento para la infraestructura de una cria en

  10. PREFACE: Acknowledgements

    NASA Astrophysics Data System (ADS)

    2015-06-01

    The organizers of the conference would like to thank for the support from the Physics Department and the Offce of Academic Affairs of the Centro de Investigación y de Estudios Avanzados and from the Consejo Nacional de Ciencia y Tecnología (Conacyt), projects 152574 and 166581.

  11. Fabrication of Optical Fiber Devices

    NASA Astrophysics Data System (ADS)

    Andres, Miguel V.

    In this paper we present the main research activities of the Laboratorio de Fibras Opticas del Instituto de Ciencia de los Materiales de la Universidad de Valencia. We show some of the main results obtained for devices based on tapered fibers, fiber Bragg gratings, acousto-optic effects and photonic crystal fibers.

  12. Base Lunar Alpha

    NASA Video Gallery

    Tu misión: Recuperar los sistemas críticos cuando un meteoro daña los equipos de supervivencia de tu ambiente lunar. Parece una película de ciencia ficción, ¿verdad? En realidad, es el nuevo juego ...

  13. The Education of the Active Televiewer of School Age.

    ERIC Educational Resources Information Center

    Munoz, Patricio Calderon; Torres, Miguel Reyes

    In response to a series of problem symptoms related to the influence of television on students, a team of professors at the Universidad de Playa Ancha de Ciencias de la Educacion in Chile undertook a project designed to train television viewers to become critical viewers of the medium. Specific objectives of the project included: (1) to design a…

  14. The Eratosthenes Space Project

    ERIC Educational Resources Information Center

    Artigas, A.; Costa, A.; Eyraud, C. H.; Perez-Verde, A.; Ros, R. M.

    2011-01-01

    The European Association for Astronomy Education (EAAE), in collaboration with the Bibliotheca Alexandrina of Egypt and the participation of schools from all around the world, performed the Eratosthenes experiment on 21 June 2010. This activity has been selected as one of the finalists in the 11th international prize organized by Ciencia en…

  15. Basic Training Programme for Library Technicians in Mexico.

    ERIC Educational Resources Information Center

    Vilentchuk, Lydia

    The Consejo Nacional de Ciencia y Tecnologia (CONACYT), set up in 1971 to further scientific and technological advancement in Mexico, commissioned this determination of the steps necessary to promote the use of libraries and recorded scientific and technical information, and to foster the reading habits of the population. A brief overview examines…

  16. Pensando en Cynthia y su Hermana: Educational Implications of United States-Mexico Transnationalism for Children

    ERIC Educational Resources Information Center

    Hamann, Edmund T.; Zuniga, Victor; Garcia, Juan Sanchez

    2006-01-01

    We use 3 brief educational biographies of students in Mexico who have previously attended public school in the United States to introduce this literature review on United States-Mexico transnational students. This article is also the first of several planned articles stemming from a currently ongoing, Consejo Nacional de Ciencia y…

  17. LIS Education in Portugal between Academia and Practice

    ERIC Educational Resources Information Center

    Ribeiro, Fernanda

    2008-01-01

    There is a brief exposition, in a historical perspective, about the evolution of the professional education in Portugal, in the area of Library and Information Science, since the creation of the Curso de Bibliotecario-Arquivista, in 1887, until its closure in 1982, when it was replaced by the Curso de Especializacao em Ciencias Documentais (CECD).…

  18. An Elementary Proof of a Converse Mean-Value Theorem

    ERIC Educational Resources Information Center

    Almeida, Ricardo

    2008-01-01

    We present a new converse mean value theorem, with a rather elementary proof. [The work was supported by Centre for Research on Optimization and Control (CEOC) from the "Fundacaopara a Ciencia e a Tecnologia" FCT, co-financed by the European Community Fund FEDER/POCTI.

  19. The Geography Olympiad in Mexico

    ERIC Educational Resources Information Center

    Garcia-Garcia, Fernando

    2007-01-01

    The formal organisation of science Olympiads in Mexico dates from 1987, when a national contest on Mathematics was held in order to identify a team to represent the country in the International Mathematics Olympiad. In 1991, the Mexican Academy of Sciences ("Academia Mexicana de Ciencias"-AMC) created the National Science Olympiads Program with…

  20. Estudio de Salud Agrícola

    Cancer.gov

    En 1993, científicos del Instituto Nacional del Cáncer, Instituto Nacional de Ciencias Ambientales y la Agencia de Protección Ambiental de Estados Unidos iniciaron un estudio conocido como Estudio de Salud Agrícola (AHS).

  1. Exploratory Learning with Geodromo: Design of Emotional and Cognitive Factors within an Educational Cross-Media Experience

    ERIC Educational Resources Information Center

    Bidarra, Jose; Martins, Olimpio

    2011-01-01

    In this paper we present Geodromo, a prototype of an educational multimedia system, part of the Portuguese "Ciencia Viva" (Live Science) educational program, which is aimed at young people and designed with innovative characteristics. The project is based on a robotic multimedia simulator and an online puzzle game aimed at the exploratory learning…

  2. Encountering Nanotechnology in an Interactive Exhibition

    ERIC Educational Resources Information Center

    Murriello, Sandra E.; Knobel, Marcelo

    2008-01-01

    This article offers findings from a learning sciences-informed evaluation of a nanoscience and nanotechnology exhibition called Nano-Aventura (NanoAdventure), based on four interactive-collaborative games and two narrated videos. This traveling exhibition was developed in Brazil by the Museu Exploratorio de Ciencias for children and teenagers…

  3. Juan Carlos D'Olivo: A portrait

    NASA Astrophysics Data System (ADS)

    Aguilar-Arévalo, Alexis A.

    2013-06-01

    This report attempts to give a brief bibliographical sketch of the academic life of Juan Carlos D'Olivo, researcher and teacher at the Instituto de Ciencias Nucleares of UNAM, devoted to advancing the fields of High Energy Physics and Astroparticle Physics in Mexico and Latin America.

  4. Keeping Kids Still during Exams

    MedlinePlus

    ... el paciente se mantenga completamente inmóvil durante el proceso de formación de imágenes. Cualquier movimiento puede hacer ... para usted. ◆ Esta página educacional del paciente provée información general en cuanto a la ciencia radiológica. ASRT ...

  5. Achieving Conservation Science that Bridges the Knowledge–Action Boundary

    PubMed Central

    Cook, Carly N; Mascia, Michael B; Schwartz, Mark W; Possingham, Hugh P; Fuller, Richard A

    2013-01-01

    both advances scientific understanding and contributes to decision making. Logrando que la Ciencia de la Conservación Trasponga la Frontera Conocimiento-Acción Resumen Hay muchas barreras para utilizar ciencia para informar a la política y práctica de la conservación. Los científicos de la conservación que desean producir ciencia relevante para el manejo deben equilibrar esta meta con el imperativo de demostrar novedad y rigor en su ciencia. Los tomadores de decisiones que buscan que sus decisiones se basen en evidencias deben equilibrar el deseo de conocimientos con la necesidad de actuar a pesar de la incertidumbre. La generación de ciencia que informe efectivamente a las decisiones de manejo requiere que la producción de información (los componentes del conocimiento) sea sobresaliente (relevante y oportuna), creíble (autoritativa, verosímil y confiable) y legítima (desarrollada mediante un proceso que considera los valores y perspectivas de todos los actores relevantes) a la vista tanto de investigadores como de tomadores de decisiones. Percibimos tres retos clave para quienes desean generar ciencia de la conservación que logre estas tres características de la información. Primero, las audiencias científicas y de manejo pueden tener percepciones contrastantes sobre la relevancia de la investigación. Segundo, la credibilidad se puede lograr a costa de la relevancia y legitimidad a la vista de los tomadores de decisiones y tercero, los diferentes actores pueden tener percepciones conflictivas sobre los que constituye información legítima. Resaltamos cuatro marcos institucionales que pueden facilitar que la ciencia informe al manejo: organizaciones de frontera (organizaciones ambientales que trasponen la frontera entre la ciencia y el manejo), investigadores científicos insertados en agencias de manejo de recursos, vínculos formales entre tomadores de decisiones y científicos en instituciones enfocadas a la investigación, y programas de

  6. Supplement: Proceedings XIth Latin American Congress of Surface Science and Its Applications (XI CLACSA)

    NASA Astrophysics Data System (ADS)

    Häberle, Patricio; Fuenzalida, Victor

    2004-07-01

    The 2003 Congreso Latinoamericano de Ciencia de Superficies y sus Aplicaciones (Latin American Congress of Surface Science and Its Applications) was held in Pucón, Chile, 7-12 December 2003. XI CLACSA is the continuation of a series of events that started in 1980. Until 1992, this series was called Simposio Latinoamericano de Física de Superficies (SLAFS). In recognition of the interdisciplinary nature of the field, starting in 1994 the meeting became CLACSA. The conference was organized by the Sociedad Latinoamericana de Ciencia de Superficies (SLACS) with the purpose of becoming a forum for the exchange of information associated with scientific research carried out in Latin America in the field of surface physics, systems of low dimensionality and areas related to condensed matter physics and science of materials. This scientific event has enjoyed a large participation from Latin American scientists, and has helped to stimulate the collaboration between researchers from Europe, Latin America and the United States.

  7. Experimental design and multiple response optimization. Using the desirability function in analytical methods development.

    PubMed

    Candioti, Luciana Vera; De Zan, María M; Cámara, María S; Goicoechea, Héctor C

    2014-06-01

    A review about the application of response surface methodology (RSM) when several responses have to be simultaneously optimized in the field of analytical methods development is presented. Several critical issues like response transformation, multiple response optimization and modeling with least squares and artificial neural networks are discussed. Most recent analytical applications are presented in the context of analytLaboratorio de Control de Calidad de Medicamentos (LCCM), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, C.C. 242, S3000ZAA Santa Fe, ArgentinaLaboratorio de Control de Calidad de Medicamentos (LCCM), Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, C.C. 242, S3000ZAA Santa Fe, Argentinaical methods development, especially in multiple response optimization procedures using the desirability function. PMID:24767454

  8. Assessing a Science Graduate School Recruitment Symposium

    PubMed Central

    González-Espada, Wilson; Díaz-Muñoz, Greetchen; Feliú-Mójer, Mónica; Flores-Otero, Jacqueline; Fortis-Santiago, Yaihara; Guerrero-Medina, Giovanna; López-Casillas, Marcos; Colón-Ramos, Daniel A.; Fernández-Repollet, Emma

    2015-01-01

    Ciencia Puerto Rico, a non-profit organization dedicated to promoting science, research and scientific education among Latinos, organized an educational symposium to provide college science majors the tools, opportunities and advice to pursue graduate degrees and succeed in the STEM disciplines. In this article we share our experiences and lessons learned, for others interested in developing large-scale events to recruit underrepresented minorities to STEM and in evaluating the effectiveness of these efforts. PMID:26770074

  9. [The continuous intrusion of subjectivity in medical decisions].

    PubMed

    Lifshitz, Alberto

    2016-01-01

    La medicina contemporánea tiene su sustento más sólido en la ciencia positivista que pretende excluir la subjetividad y centrarse en el conocimiento sólido, objetivo, duro, demostrable, reproducible, verificable y falseable. Este enfoque ha generado beneficios indudables en tanto que en las decisiones se eluden muchas ideas que dominaron el pensamiento médico como la magia, el prejuicio, la casualidad, las fuerzas sobrenaturales, los dogmas y las creencias. PMID:27595244

  10. [Pharmacists in transition. Academy and Pharmacy in Mexico from 1833 to 1865].

    PubMed

    Morales-Cosme, Alba Dolores; Viesca-Treviño, Carlos

    2016-01-01

    From the second half of the 19th century, health disciplines went through an institutional and professional restructuring, which progressively altered the guild order that had characterized them to that point. In the case of Pharmacy, this process implied the generation of officially recognized spaces, as the chairs of Pharmacy and Medical Substance, founded during the Establecimiento de Ciencias Médicas (Establishment of Medical Sciences) (1833). In those spaces it was sought to institutionalize knowledge and modern practices related to Pharmacy. In this work we look over the first academic experience of the pharmaceutical community in that new space of instruction, based on the records belonging to the students enrolled in the Establecimiento de Ciencias Médicas from 1833 to 1865, year of the enrollment of the last generation. The information contained in those 163 records displays the way the pharmaceutical field was transformed, after the aforementioned restructuring. The reader will notice the diverse normativity, which regulated the joining of pharmacists to academic life (of which, until then, they were excluded). He will also realize how, among the first students enrolled in the Establecimiento de Ciencias Médicas, said normativity was broke in order to adapt it to the known ways of students and professors. Progressively, the guild instruction would be ousted by the institutional instruction (for example, the years of practice in the drugstores were rejected), so that the guild ways of teaching were changing to turn the pharmacist into an individual of institutional instruction. PMID:26820211

  11. Science and technology disclosure in the state of Queretaro: Science and Technology for Children program

    NASA Astrophysics Data System (ADS)

    Contreras Flores, Rubén; Villeda Muñoz, Gabriel

    2007-03-01

    Science and technology disclosure is an integral part of our scientific work as researches; it is an induction process for children, young people and teachers of primary and secondary schools in the state of Queretaro. Education must be offered in a clear and objective way, it allows to the students apply the acquired knowledge to understand the world and improve his quality of life. Nowadays, the Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada of the Instituto Politecnico Nacional Unidad Queretaro (CICATA-IPN Queretaro) together with the Consejo de Ciencia y Tecnologia del Estado de Queretaro (CONCYTEQ) have implemented the "Science and Technology for Children" program (Ciencia y Tecnologia para Ninos - CTN), it allows to the educative sector obtain information through the CONCYTEQ web page. The fist stage of the program was the development of two subjects: the brochure titled "Petroleum, Nonrenewable Natural Resource that Moves the World" and the manual "Experiments of Physics". At the moment we are working with the second stage of the program, it is about the energy generation using renewable sources such as: geothermal, aeolian, solar and biomass. The CTN program allows to students and teachers to create conscience about the importance of the development of the science of technology in our country.

  12. Silvopastoralism and autochthonous equine livestock: analysis of the infection by endoparasites.

    PubMed

    Francisco, I; Arias, M; Cortiñas, F J; Francisco, R; Mochales, E; Sánchez, J A; Uriarte, J; Suárez, J L; Morrondo, P; Sánchez-Andrade, R; Díez-Baños, P; Paz-Silva, A

    2009-10-14

    Two groups of autochthonous Pura Raza Galega (PRG) horses, one comprising 483 animals under a silvopasturing regime, and the other comprising 72 PRG horses managed in farms, were used to analyse the effect of silvopasture on infection by endoparasites. Results were considered according to the age and the sex of the horses. Faecal samples were individually collected from each animal and analysed by the coprological flotation, sedimentation and migration techniques. Coprocultures were also done to identify the main strongylid genera affecting the horses. Eggs from the gastrointestinal nematoda Parascaris equorum, strongyles and Oxyuris equi were the only endoparasites observed in the faeces of the horses. Larvae of Trichonema and Cyalocephalus spp. (small strongyles) and Strongylus and Triodontophorus (large strongyles) were identified in the coprocultures. The silvopasturing horses had the highest prevalence of the helminth parasites. The percentage of horses passing ascarid eggs was significantly higher in pasturing horses younger than 3 years. The prevalence of strongyles was statistically greater in the oldest grazing equines. Mares reached the highest prevalence of helminth egg output. Our results showed that native horses kept under silvopasture had the highest prevalence of the ascarids, strongyles and oxyurids, possibly due to their exposure to contaminated grazing areas, lack of appropriate feeding and control of their health status. We conclude that silvopasture increases the presence of infection by gastrointestinal nematoda in wild horses, especially by strongyles. Suitable measures to control parasitic diseases affecting horses in silvopasture should be considered in those systems. PMID:19632049

  13. [Not Available].

    PubMed

    Curilem Gatica, Cristian; Almagià Flores, Atilio; Rodríguez Rodríguez, Fernando; Yuing Farias, Tuillang; Berral de la Rosa, Francisco; Martínez Salazar, Cristian; Jorquera Aguilera, Carlos; Bahamondes Ávila, Carlos; Soís Urra, Patricio; Cristi Montero, Carlos; Bruneau Chávez, José; Pinto Aguilante, Juan; Niedmann Brunet, Luis

    2016-01-01

    El índice de masa corporal (IMC) otorga uno de los índices más usados para determinar el estado nutricional de la población a nivel mundial, donde a pesar de existir recomendaciones claras y definidas para su interpretación como el sexo, edad, raza, entre otros, normalmente se estandariza su clasificación, independiente de las variables, aumentando el error en el resultado y en la clasificación del estado nutricional.El uso de la composición corporal a través de la antropometría entrega mayor información que el IMC, siendo la masa grasa y la masa muscular los principales resultados útiles.Este artículo presenta una revisión de las ecuaciones existentes y propone aquellas más simples y con menor error de estimación para ser usadas como una herramienta que reemplace o complemente al IMC, favoreciendo una mejor comprensión e interpretación del estado nutricional y nivelde actividad física en niños y adolescentes. PMID:27513512

  14. Prevalence of antibodies against Treponema pallidum among HIV-positive patients in a tertiary care hospital in Mexico.

    PubMed

    Mata-Marín, José Antonio; Sandoval-Sánchez, Juan Joel; Huerta-García, Gloria; Arroyo-Anduiza, Carla Ileana; Alcalá-Martínez, Enrique; Mata-Marín, Luis Alberto; Sandoval-Ramirez, Jorge Luis; Gaytán-Martínez, Jesús

    2015-02-01

    Our objective was to determine the seroprevalence of syphilis among HIV-infected patients in a tertiary care hospital in Mexico City. A cross-sectional study was developed, and 318 HIV-positive patients were evaluated from January to February 2013 at Hospital de Infectología, National Medical Center 'La Raza' (a tertiary care hospital specialising in infectious diseases in Mexico City). Laboratory data were screened for the detection of antibodies against Treponema pallidum. Patients completed a questionnaire relating to socio-demographic data and factors associated with syphilis. Of the 318 patients, 83% were men. The mean age ± SD was 36 ± 11 years; 52% were men who have sex with men and 47% had undertaken higher education. The overall seroprevalence of syphilis among these patients was 25% (95% confidence interval 21%, 30%). Men who have sex with men had a significantly higher seroprevalence (30% vs. 15%, p = 0.009). We conclude that, in Mexico, there is a high seroprevalence of syphilis antibodies in HIV-infected patients and that men who have sex with men are the group most affected. PMID:24713227

  15. "One of the Most Uniform Races of the Entire World": Creole Eugenics and the Myth of Chilean Racial Homogeneity.

    PubMed

    Walsh, Sarah

    2015-11-01

    This article illuminates why Nicolás Palacios's 1904 monograph, Raza chilena: Libro escrito por un Chileno i para los Chilenos [Chilean Race: A Book Written by a Chilean for Chileans], is central to the creation of a myth of Chilean racial homogeneity at the turn of the twentieth century. Placing Palacios in the context of Latin American eugenic discourse, it demonstrates how he selected a specific racial origin story in order to accommodate his belief in racial hierarchy while also depicting race mixing in a positive light. Specifically, the article highlights how the myth of Chilean racial homogeneity elided the difference between the term "mestizo," which was applied to people of mixed racial heritage, and "white." I contend that Palacios sought to differentiate Chileans from other Latin Americans by emphasizing their racial distinctiveness. The article therefore highlights that Latin American eugenics was concerned with the creation of national narratives that historicized particular racial mixtures in order to reify and affirm national differences. As such, it connects to literature regarding the history of eugenics, race, nation, and the creation of whiteness. PMID:25733067

  16. [Clinical practice guideline. Traumatic urethral stenosis in males].

    PubMed

    Serrano-Brambila, Eduardo Alonso; Moreno-Alcázar, Othón Martino; Neri-Páez, Edgar; Sánchez-Martínez, Luis Carlos; Hernández-Ordóñez, Octavio Francisco; Morales-Morales, Arturo; Basavilvazo-Rodríguez, M Antonia; Torres-Arreola, Laura del Pilar; Valenzuela-Flores, Adriana Abigail; Hernández-Valencia, Marcelino

    2013-01-01

    The incidence of urethral stenosis in Mexico had not been documented. At the Centro Médico Nacional La Raza, during the year 2010, 629 patients with urethral stenosis were attended as outpatient consultation: 85 % with previous urethral stenosis and 15 % with urethral treatment complication. Urethral stenosis is a chronic illness, with multiple etiological origins and the handling is controversial. It has a great negative impact for the patients and the recurrence reaches 85 %. The treatment consisted of an invasive approach (urethral dilations, endoscopy procedure) and open surgery (urethroplasty). The World Health Organization and World Alliance take the world challenge about the urinary tract infections associated with the attention of patients, focused on urethral stenosis. The objective of the following clinical guide is to offer to the health professional a clinical tool for making decisions in the handling of the hardship or masculine urethral stenosis, based on the best available evidence, carrying out in systematized form with bibliographical research using validated terms of the MeSH: urethral structures, in the databases Trip database, PubMed, Guideline Clearinghouse, Cochrane Library and Ovid. PMID:24021082

  17. [Taxonomic status of the Artashat virus (ARTSV) (Bunyaviridae, Nairovirus) isolated from the ticks Ornithodoros alactagalis Issaakjan, 1936 and O. verrucosus Olenev, Sassuchin et Fenuk, 1934 (Argasidae Koch, 1844) collected in Transcaucasia].

    PubMed

    Al'khovskiĭ, S V; L'vov, D K; Shchelkanov, M Iu; Shchetinin, A M; Deriabin, P G; Gitel'man, A K; Botikov, A G; Samokhvalov, E I; Zakarian, V A

    2014-01-01

    The Artashat virus (ARTSV) was originally isolated fom the Ornithodoros alactagalis Issaakjan, 1936 (Argasidae Koch, 1844), which were collected in the burrow of small five-toed jerboa (Allactaga elater Lichtenstein, 1825) in Armenia in 1972. Later, the ARTSV was isolated from the O. verrucosus Olenev, Sassuchin et Fenuk, 1934 collected in the burrows of Persian gerbil (Meriones persicus Blanford, 1875) in Azerbaijan. Based on the virion morphology, the ARTSV was assigned to the Bunyaviridae viruses. In this work, the ARTSV genome was partially sequenced (GenBank ID: KF801650) and it was shown that the ARTSV is a new member of the Nairovirus genus. ARTSV has from 42% (Issyk-Kul virus) to 58% (Raza virus, Hughes group) similarity with the nairoviruses for nucleotide sequence of part of RNA-dependent RNA-polymerase (RdRp). The similarity on the amino acid level is 65-70%. Low level of homology and the equidistant position of the ARTSV on phylogenetic tree indicate that the ARTSV is a new prototype species of the Nairovirus genus (Bunyaviridae) forming a separate phylogenetic branch. PMID:25335415

  18. Virtual Reality for Pain Management in Cardiac Surgery

    PubMed Central

    Mosso-Vázquez, José Luis; Gao, Kenneth; Wiederhold, Brenda K.

    2014-01-01

    Abstract Surgical anxiety creates psychological and physiological stress, causes complications in surgical procedures, and prolongs recovery. Relaxation of patients in postoperative intensive care units can moderate patient vital signs and reduce discomfort. This experiment explores the use of virtual reality (VR) cybertherapy to reduce postoperative distress in patients that have recently undergone cardiac surgery. Sixty-seven patients were monitored at IMSS La Raza National Medical Center within 24 hours of cardiac surgery. Patients navigated through a 30 minute VR simulation designed for pain management. Results were analyzed through comparison of pre- and postoperative vital signs and Likert scale survey data. A connection was found in several physiological factors with subjective responses from the Likert scale survey. Heavy positive correlation existed between breathing rate and Likert ratings, and a moderate correlation was found between mean arterial pressure and Likert ratings and heart rate and Likert ratings, all of which indicated lower pain and stress within patients. Further study of these factors resulted in the categorization of patients based upon their vital signs and subjective response, providing a context for the effectiveness of the therapy to specific groups of patients. PMID:24892200

  19. El contexto de la familia y el vecindario en la salud de los ancianos del estudio EPESE hispano

    PubMed Central

    Reyes-Ortiz, Carlos A.; Camacho, María E.; Eschbach, Karl; Markides, Kyriakos S.

    2014-01-01

    RESUMEN En este artículo se discute el papel de la familia y el vecindario en la salud de los ancianos méjico-americanos del estudio EPESE (Established Populations for Epidemiologic Studies of the Elderly) hispano. La paradoja epidemiológica consiste en que, a pesar de estar en desventaja socioeconómica, los ancianos hispanos tienen mortalidad relativamente menor que los ancianos de raza blanca. Esto es especialmente cierto cuando el anciano vive en los vecindarios donde hay un porcentaje alto de méjico-americanos. La familia también juega un papel importante en estos ancianos al disminuir el riesgo de institucionalización o de morbilidad. Asimismo, el estrés originado en problemas económicos o al depender económicamente de la familia, habiendo inmigrado en edades tardías, puede sobrepasar la capacidad de amortiguamiento del estrés y afectar la salud del anciano méjico-americano. PMID:25190897

  20. Teaching and learning the geological knowledge as a part of the science education general field

    NASA Astrophysics Data System (ADS)

    Aguirre-Pérez, Constancio

    2010-05-01

    space sciences" emphasizes still further such character receiving the contributions of physics, chemistry, biology and environmental science in a kind of scientific-technical mixture which enriches the discipline itself and constitutes a fundamental basis for the evolution of knowledge in its broadest sense (Martinez Frias et al. 2008). In this paper we propose to show some of the experiences and didactic innovations in the teaching of geology found in the scientific literature in recent years and likewise part of an author's own work on the establishment of analogies on the time variable based on Carl Sagan's cosmic calendar. With these analogies we try to approximate geologic times to the understanding of high school and first university courses students (Aguirre-Perez, C. 2008) REFERENCES ALIBERAS, J. GUTIÉRREZ, R. and IZQUIERDO, M. (1989). La Didáctica de las Ciencias: Una empresa racional. Enseñanza de las Ciencias, 7 (3), pp. 227-284. GUTIÉRREZ, R. (1987). Psicología y aprendizaje de las Ciencias. El modelo de Ausubel. Enseñanza de las Ciencias, 5 (2), pp. 118-128. MARTÍNEZ FRÍAS, J. LUNAR, R. RODRÍGUEZ-LOSADA, J.A. EFF-DARWICH, A. and MADERO JARABO, J. (2008)"La Geología en la exploración planetaria (Geology inplanetary exploration). Geo-temas 10, pp. 1621-1624. PEDRINACI, E. (2000): La Enseñanza y el aprendizaje del conocimiento geológico. Didáctica de las Ciencias Experimentales. Teoría y Práctica de la Enseñanza de las ciencias, pp. 479-503. Ed. Marfil.

  1. ASTRONET: Towards a Strategic Plan for European Astronomy

    NASA Astrophysics Data System (ADS)

    Gallego, J.; Torra, J.; Barcons, X.; Mas-Hesse, M.

    ASTRONET is an ERA-Net financed by the European Commission FP6 under the initiative Integrating and Strengthening the European Research Area (ERA). ASTRONET was created by a group of European funding agencies in order to establish a comprehensive long-term planning for the development of European astronomy. The objective of this effort is to consolidate and reinforce the world-leading position that European astronomy has attained at the beginning of this twenty-first century. The Ministerio de Ciencia e Innovación is the Spanish representative.

  2. Student designed experiments to learn fluids

    NASA Astrophysics Data System (ADS)

    Stern, Catalina

    2013-11-01

    Lasers and high speed cameras are a wonderful tool to visualize the very complex behavior of fluids, and to help students grasp concepts like turbulence, surface tension and vorticity. In this work we present experiments done by physics students in their senior year at the School of Science of the National University of Mexico as a final project in the continuum mechanics course. Every semester, the students make an oral presentation of their work and videos and images are kept in the web page ``Pasión por los Fluidos''. I acknowledge support from the Physics Department of Facultad de Ciencias, Universidad Nacional Autónoma de México.

  3. Effective diffusion of confined active Brownian swimmers

    NASA Astrophysics Data System (ADS)

    Sandoval, Mario; Dagdug, Leonardo

    2014-11-01

    We find theoretically the effect of confinement and thermal fluctuations, on the diffusivity of a spherical active swimmer moving inside a two-dimensional narrow cavity of general shape. The explicit formulas for the effective diffusion coefficient of a swimmer moving inside two particular cavities are presented. We also compare our analytical results with Brownian Dynamics simulations and we obtain excellent agreement. L.D. thanks Consejo Nacional de Ciencia y Tecnologia (CONACyT) Mexico, for partial support by Grant No. 176452. M. S. thanks CONACyT and Programa de Mejoramiento de Profesorado (PROMEP) for partially funding this work under Grant No. 103.5/13/6732.

  4. Experimental microbubble generation by sudden pressure drop and fluidics

    NASA Astrophysics Data System (ADS)

    Franco Gutierrez, Fernando; Figueroa Espinoza, Bernardo; Aguilar Corona, Alicia; Vargas Correa, Jesus; Solorio Diaz, Gildardo

    2014-11-01

    Mass and heat transfer, as well as chemical species in bubbly flow are of importance in environmental and industrial applications. Microbubbles are well suited to these applications due to the large interface contact area and residence time. The objective of this investigation is to build devices to produce microbubbles using two methods: pressure differences and fluidics. Some characteristics, advantages and drawbacks of both methods are briefly discussed, as well as the characterization of the bubbly suspensions in terms of parameters such as the pressure jump and bubble equivalent diameter distribution. The authors acknowledge the support of Consejo Nacional de Ciencia y Tecnología.

  5. Inflationary phase in Brans-Dicke cosmology with a cosmological constant

    NASA Astrophysics Data System (ADS)

    Berman, Marcelo Samuel

    1989-12-01

    It has been shown earlier that, for a perfect fluid, a perfect gas law of state, and the Robertson-Walker metric, an exponential phase in Brans-Dicke cosmology is possible, with both positive pressure and density, but not with the violated energy condition p = -ρ. We demonstrate in this paper that the inclusion of a cosmological constant into the theory does not change that picture. Permanent address: Departamento de Ciencias Exatas da Faculdade de Filosofia, Ceincias e Letras da FURJ, Joinville, SC 89200, Brazil.

  6. Letters to the Editor

    NASA Astrophysics Data System (ADS)

    1998-03-01

    All the Letters to the Editor in this issue are in the same PostScript or PDF file. Contents Comment on `Magnetic and electric field strengths of high voltage power lines and household appliances' José Luis Giordano Dept. de Ciencia y Tecnología de Materiales y Fluidos, CPSI, Universidad de Zaragoza, Spain Twins paradox S R Carson Norton College, Malton, North Yorkshire, UK On alternative ways of finding the ratio of specific heats of gases Tomas Ficker Physics Department, Technical University of Brno, Czech Republic

  7. [A critical view about public health in Mexico].

    PubMed

    Tapia-Conyer, Roberto

    2016-01-01

    La salud pública se encuentra en un momento crucial, el cual tenemos que aprovechar para devolver a México el liderazgo que lo distinguió a nivel regional y mundial. Para ello, quienes hemos dedicado esfuerzos profesionales al fortalecimiento de la salud pública mexicana debemos entender el estado que guardan la ciencia, las nuevas tecnologías y los nuevos desarrollos para no solamente evitar el rezago, sino situarnos en la vanguardia, como corresponde a la acreditada tradición médica de nuestro país. PMID:27160628

  8. Experimental Approach to Teaching Fluids

    NASA Astrophysics Data System (ADS)

    Stern, Catalina

    2015-11-01

    For the last 15 years we have promoted experimental work even in the theoretical courses. Fluids appear in the Physics curriculum of the National University of Mexico in two courses: Collective Phenomena in their sophomore year and Continuum Mechanics in their senior year. In both, students are asked for a final project. Surprisingly, at least 85% choose an experimental subject even though this means working extra hours every week. Some of the experiments were shown in this congress two years ago. This time we present some new results and the methodology we use in the classroom. I acknowledge support from the Physics Department, Facultad de Ciencias, UNAM.

  9. The Cauchy problem for the Pavlov equation

    NASA Astrophysics Data System (ADS)

    Grinevich, P. G.; Santini, P. M.; Wu, D.

    2015-10-01

    Commutation of multidimensional vector fields leads to integrable nonlinear dispersionless PDEs that arise in various problems of mathematical physics and have been intensively studied in recent literature. This report aims to solve the scattering and inverse scattering problem for integrable dispersionless PDEs, recently introduced just at a formal level, concentrating on the prototypical example of the Pavlov equation, and to justify an existence theorem for global bounded solutions of the associated Cauchy problem with small data. An essential part of this work was made during the visit of the three authors to the Centro Internacional de Ciencias in Cuernavaca, Mexico in November-December 2012.

  10. Desarrollo curricular, conciencia ambiental y tecnologia para estudiantes de intermedia: Una investigacion en accion

    NASA Astrophysics Data System (ADS)

    Rodriguez Ramos, Teresita

    Se llevó a cabo una investigación en acción con los propósitos de 1) documentar las relaciones de las tecnologías de la información y la comunicación en las clases de ciencias de escuela intermedia como elemento de apoyo cuando se aborda el tema ambiental y sus conceptos pertinentes, a partir de las observaciones de la investigadora, así como las entrevistas y diarios reflexivos de los estudiantes de una escuela intermedia en la zona metropolitana, y luego 2) diseñar una unidad instruccional sobre el tema ambiental que integre actividades tecnologías para el curso de ciencias de la escuela intermedia según el modelo PROCIC y las observaciones que hayan iniciado los estudiantes participantes. Finalmente, se plantearon las implicaciones educativas para el currículo del Programa de Ciencias al instrumentar este modelo de unidad mediante PROCIC, e integrado la tecnología y el tema ambiental. Los hallazgos se analizaron y se categorizaron de acuerdo con las preguntas de investigación. El hallazgo principal de la investigación aborda las cuatro relaciones centrales en las que se articula la utilización de las tecnologías y sus aplicaciones en la clase de ciencias. Estas cuatro relaciones que recogen la posición de los estudiantes son: 1) Perspectiva de los estudiantes hacia la tecnología. 2) Participación de los estudiantes en los aspectos docentes. 3) Aprendizaje estudiantil sobre el ambiente, y 4) Conciencia ambiental en relación con la vida diaria. Estas relaciones ponen de manifiesto,cómo se plantea en las implicaciones, la necesidad de más investigación en acción en la sala de clases, la importancia—como tema transversal—de la conciencia ambiental mediante la tecnología al construir conocimientos significativos dentro y fuera de la escuela, asó como, valorar la investigación y la dialogicidad en la sala de clases como actividades que obligan al reexamen de la práctica didáctica en su formas curriculares de objetivos, recursos

  11. Sexual performance of mass reared and wild Mediterranean fruit flies (Diptera: Tephritidae) from various origins of the Madeira Islands

    SciTech Connect

    Pereira, R.; Silva, N.; Quintal, C.; Abreu, R.; Andrade, J.; Dantas, L.

    2007-03-15

    campo. Al mismo tiempo, el proceso de la domesticacion en el laboratorio fue evaluado. Tres poblaciones naturales, una poblacion semi-natural y una poblacion criada en masa fueron evaluadas: las poblaciones natural de (1) Isla de Madeira (costa norte), (2) Isla de Madeira (costa sur) y (3) Isla de Porto Santo; (4) una poblacion semi-natural despues de 7 a 10 generaciones de domesticacion en el laboratorio (respectivamente, para el primero y segundo experimento); y (5) la raza para separar sexos geneticamente que es usada en el laboratorio de la mosca mediterranea de Madeira (VIENNA 7mix2000). Los experimentos usando jaulas en el campo mostraron que las poblaciones de diferentes origines fueron en su mayor parte compatibles. No hubo diferencias significativas en la capacidad para competir sexualmente entre las poblaciones naturales. Los machos semi-naturales y los machos criados en masa mostraron un desempeno significativamente bajo en ambos experimentos que los machos naturales en el logro de copula con las hembras naturales. Este estudio indica que no hay un aislamiento significativo entre las razas probadas, aunque el desempeno en el apareamiento fue reducido en las moscas criadas en masa y semi-naturales despues de 7 a 10 generaciones en el laboratorio. (author)

  12. Cytogenetic findings in 303 Mexican patients with de novo acute myeloblastic leukemia.

    PubMed

    Arana-Trejo, R M; Gómez-Morales, E; Rubio-Borja, M E; Kassack-Ipiña, J J; Cervantes-Peredo, A; Guerrero-Rivera, S; González-Llaven, J; Gutiérrez-Romero, M; Pizzuto-Chávez, J; Kofman-Alfaro, S

    1997-01-01

    In this report we show the chromosomal changes seen in a group of 303 Mexican patients with de novo Acute Myeloblastic Leukemia (AML). Two hundred forty-two patients were diagnosed and treated at two hospitals affiliated with the Instituto Mexicano del Seguro Social (IMSS). These are the Centro Medico Nacional Siglo XXI and Centro Medico La Raza Hospitals; the remaining 61 patients were diagnosed and treated at the Hospital General de Mexico (HGM). Clonal abnormalities were detected in 75.6% of the patients; this result agrees with what has been reported in other large series of AML studies. The incidence of changes per hospital was similar in patients from the IMSS hospitals (72-75%), while an increase was seen in patients from the HGM (85.2%). The chromosomal changes seen in this study in order of frequency were: t(15;17)[18.8%], t(9;22)[9.2%], miscellaneous chromosomal changes (mainly rearrangements of chromosomes 1,2,3,12y17)[8.2%], abnormalities of 16q22 [7.3%], t(8;21)[6.3%], -7/del(7q)[5.6%], t(6;9)[5.3%], and abnormalities of 11q23 [4.6%]. We reported an increase in the incidence of certain types of chromosomal changes seen in cases of AML, in comparison with reports from other countries. These differences could be due to methodological variations, although ethnic, socioeconomic and nutritional differences must not be disregarded. We support this finding when comparing distribution of changes in the population of patients seen in the IMSS hospitals with those from the HGM; the main difference lies in the socioeconomic level. PMID:9204610

  13. Short communication: oral lesions in HIV/AIDS patients undergoing HAART including efavirenz.

    PubMed

    Aquino-García, S I; Rivas, M A; Ceballos-Salobreña, A; Acosta-Gio, A E; Gaitán-Cepeda, L A

    2008-06-01

    Oral lesions (OL) have an important prognostic value for HIV/AIDS patients. However, the behavior of OL in HIV/AIDS patients undergoing highly active antiretroviral therapy including efavirenz (HAART/EFV) has not been documented. Our objective was to establish the prevalence of OL in HIV/AIDS patients undergoing HAART/EFV and to compare it with the prevalence of OL in patients undergoing antiretroviral therapy including a protease inhibitor (HAART/PI). Seventy-three HIV/AIDS patients undergoing antiretroviral treatment for at least for 6 months at "La Raza" Medical Center's Internal Medicine Unit (IMSS, Mexico City) were included. To detect OL, a detailed examination of oral soft tissues was performed in each patient. Patient records recorded gender, seropositivity time, route of contagion, antiretroviral therapy type and duration, CD4 lymphocyte count/ml, and viral load. Two groups were formed: 38 patients receiving HAART/EFV [two nucleoside analogue reverse transcriptase inhibitors (NARTI) plus efavirenz] and 35 patients receiving HAART/PI (two NARTIs plus one PI). OL prevalence was established in each study group. The Chi-square test was applied (p < 0.05(IC95%)). OL prevalence in the HAART/EFV group (32%) was lower (p < 0.007) than in the HAART/PI group (63%). Candidosis was the most prevalent OL in both groups. Herpes labialis, HIV-associated necrotizing periodontitis, xerostomia, hairy leukoplakia, and nonspecific oral sores were identified. The highest prevalence for all OL was found in the HAART/PI group. These findings suggest that HIV/AIDS patients undergoing HAART/EFV show a lower prevalence of oral lesions than patients undergoing HAART/PI. PMID:18507528

  14. Genomic Characterization of the Genus Nairovirus (Family Bunyaviridae)

    PubMed Central

    Kuhn, Jens H.; Wiley, Michael R.; Rodriguez, Sergio E.; Bào, Yīmíng; Prieto, Karla; Travassos da Rosa, Amelia P. A.; Guzman, Hilda; Savji, Nazir; Ladner, Jason T.; Tesh, Robert B.; Wada, Jiro; Jahrling, Peter B.; Bente, Dennis A.; Palacios, Gustavo

    2016-01-01

    Nairovirus, one of five bunyaviral genera, includes seven species. Genomic sequence information is limited for members of the Dera Ghazi Khan, Hughes, Qalyub, Sakhalin, and Thiafora nairovirus species. We used next-generation sequencing and historical virus-culture samples to determine 14 complete and nine coding-complete nairoviral genome sequences to further characterize these species. Previously unsequenced viruses include Abu Mina, Clo Mor, Great Saltee, Hughes, Raza, Sakhalin, Soldado, and Tillamook viruses. In addition, we present genomic sequence information on additional isolates of previously sequenced Avalon, Dugbe, Sapphire II, and Zirqa viruses. Finally, we identify Tunis virus, previously thought to be a phlebovirus, as an isolate of Abu Hammad virus. Phylogenetic analyses indicate the need for reassignment of Sapphire II virus to Dera Ghazi Khan nairovirus and reassignment of Hazara, Tofla, and Nairobi sheep disease viruses to novel species. We also propose new species for the Kasokero group (Kasokero, Leopards Hill, Yogue viruses), the Ketarah group (Gossas, Issyk-kul, Keterah/soft tick viruses) and the Burana group (Wēnzhōu tick virus, Huángpí tick virus 1, Tǎchéng tick virus 1). Our analyses emphasize the sister relationship of nairoviruses and arenaviruses, and indicate that several nairo-like viruses (Shāyáng spider virus 1, Xīnzhōu spider virus, Sānxiá water strider virus 1, South Bay virus, Wǔhàn millipede virus 2) require establishment of novel genera in a larger nairovirus-arenavirus supergroup. PMID:27294949

  15. Compartment syndrome, rhabdomyolysis and risk of acute renal failure as complications of the urological surgery.

    PubMed

    Kochiashvili, D; Sutidze, M; Tchovelidze, Ch; Rukhadze, I; Dzneladze, A

    2007-02-01

    Current knowledge related to the risk of CS when operating in these positions (Lloyd Davies and Trendelenburg tilt) is such that it can be deemed negligent to keep patients in this position (with legs higher than the heart) when not absolutely necessary. If it means repositioning and redraping, thus adding a few extra minutes to the episode and costing a small amount in additional drapes, surely this is a small price to pay for excellent perioperative care? If repositioning is impossible to execute, the head-down tilt position should be reversed every two hours, for a short period of time, to allow more natural perfusion of the lower limbs to occur. Raza et al recommend that if the anticipated procedure duration is beyond four hours, the legs should be removed from supports every two hours for a short period to prevent reperfusion injury. The use of Allen stirrups is preferred to calf supports or metal skids. Turnbull and Mills suggest that we should certainly review our use of compression stockings and intermittent compression devices when operating on patients in the Lloyd Davies position. It will be deemed negligent to misdiagnose (ie: mistake for a DVT) or delay treatment (by prolonged re-assessment) of CS postoperatively when patients have been subjected to prolonged surgery in these abnormal positions. Delayed or missed diagnosis may not only be limb-threatening (and cause a very protracted hospital stay)--it can be life-threatening. With today's current knowledge, surgeons undertaking prolonged surgery in abnormal positions must be aware of this, fortunately rare, complication. Practice guidelines within perioperative care should reflect current knowledge and ensure that risk is minimized. Patients who take legal action if they have experienced this condition may be awarded substantial costs against negligence if lack of care can be proven or diagnosis has been delayed. PMID:17404439

  16. Clinical and biochemical profiles suggest fibromuscular dysplasia is a systemic disease with altered TGF-β expression and connective tissue features

    PubMed Central

    Ganesh, Santhi K.; Xu, Zhi; Schoenhoff, Florian; Griswold, Benjamin F.; Yang, Jiandong; Tong, Lan; Yang, Min-Lee; Hunker, Kristina; Sloper, Leslie; Kuo, Shinie; Raza, Rafi; Milewicz, Dianna M.; Francomano, Clair A.; Dietz, Harry C.; Van Eyk, Jennifer; McDonnell, Nazli B.

    2014-01-01

    Fibromuscular dysplasia (FMD) is a rare, nonatherosclerotic arterial disease for which the molecular basis is unknown. We comprehensively studied 47 subjects with FMD, including physical examination, spine magnetic resonance imaging, bone densitometry, and brain magnetic resonance angiography. Inflammatory biomarkers in plasma and transforming growth factor β (TGF-β) cytokines in patient-derived dermal fibroblasts were measured by ELISA. Arterial pathology other than medial fibrodysplasia with multifocal stenosis included cerebral aneurysm, found in 12.8% of subjects. Extra-arterial pathology included low bone density (P<0.001); early onset degenerative spine disease (95.7%); increased incidence of Chiari I malformation (6.4%) and dural ectasia (42.6%); and physical examination findings of a mild connective tissue dysplasia (95.7%). Screening for mutations causing known genetically mediated arteriopathies was unrevealing. We found elevated plasma TGF-β1 (P=0.009), TGF-β2 (P=0.004) and additional inflammatory markers, and increased TGF-β1 (P=0.0009) and TGF-β2 (P=0.0001) secretion in dermal fibroblast cell lines from subjects with FMD compared to age- and gender-matched controls. Detailed phenotyping of patients with FMD allowed us to demonstrate that FMD is a systemic disease with alterations in common with the spectrum of genetic syndromes that involve altered TGF-β signaling and offers TGF-β as a marker of FMD.—Ganesh, S. K., Morissette, R., Xu, Z., Schoenhoff, F., Griswold, B. F., Yang, J., Tong, L., Yang, M.-L., Hunker, K., Sloper, L., Kuo, S., Raza, R., Milewicz, D. M., Francomano, C. A., Dietz, H. C., Van Eyk, J., McDonnell, N. B. Clinical and biochemical profiles suggest fibromuscular dysplasia is a systemic disease with altered TGF-β expression and connective tissue features. PMID:24732132

  17. Genomic Characterization of the Genus Nairovirus (Family Bunyaviridae).

    PubMed

    Kuhn, Jens H; Wiley, Michael R; Rodriguez, Sergio E; Bào, Yīmíng; Prieto, Karla; Travassos da Rosa, Amelia P A; Guzman, Hilda; Savji, Nazir; Ladner, Jason T; Tesh, Robert B; Wada, Jiro; Jahrling, Peter B; Bente, Dennis A; Palacios, Gustavo

    2016-01-01

    Nairovirus, one of five bunyaviral genera, includes seven species. Genomic sequence information is limited for members of the Dera Ghazi Khan, Hughes, Qalyub, Sakhalin, and Thiafora nairovirus species. We used next-generation sequencing and historical virus-culture samples to determine 14 complete and nine coding-complete nairoviral genome sequences to further characterize these species. Previously unsequenced viruses include Abu Mina, Clo Mor, Great Saltee, Hughes, Raza, Sakhalin, Soldado, and Tillamook viruses. In addition, we present genomic sequence information on additional isolates of previously sequenced Avalon, Dugbe, Sapphire II, and Zirqa viruses. Finally, we identify Tunis virus, previously thought to be a phlebovirus, as an isolate of Abu Hammad virus. Phylogenetic analyses indicate the need for reassignment of Sapphire II virus to Dera Ghazi Khan nairovirus and reassignment of Hazara, Tofla, and Nairobi sheep disease viruses to novel species. We also propose new species for the Kasokero group (Kasokero, Leopards Hill, Yogue viruses), the Ketarah group (Gossas, Issyk-kul, Keterah/soft tick viruses) and the Burana group (Wēnzhōu tick virus, Huángpí tick virus 1, Tǎchéng tick virus 1). Our analyses emphasize the sister relationship of nairoviruses and arenaviruses, and indicate that several nairo-like viruses (Shāyáng spider virus 1, Xīnzhōu spider virus, Sānxiá water strider virus 1, South Bay virus, Wǔhàn millipede virus 2) require establishment of novel genera in a larger nairovirus-arenavirus supergroup. PMID:27294949

  18. Magnetic Resonance Project 35-26-7: A Cuban Case of Engineering Physics and Biophysics

    NASA Astrophysics Data System (ADS)

    Cabal Mirabal, Carlos A.

    The Magnetic Resonance Project 35-26-7 started in December 1987, commissioned by the [then] Cuban Prime Minister, Fidel Castro, who—concerned about introducing technological advancement into the Cuban health [system]—had for some months taken an interest in the possibility of building magnetic resonance imaging (MRI) equipment for medical diagnosis in Cuba (Zito M, Argüelles MM et al, Y sin embargo-: ciencia: hablan 30 investigadores cubanos. Editoria April, Habana, pp 56-66, 1999; Cabal, Biofísica Médica. In: Fidel Castro Dìas-Balart (eds) Cuba. Amanecer del Tercer Milenio. Ciencia, Sociedad y Tecnología: Biofísica Médica. Debate Editorial, Madrid, pp 31-48, 2002). Many of the companies producing MRI equipment were unable to deliver this technology to Cuba due to the bloqueo, the United States embargo against Cuba. Those who were later to advance the project's progress in scientific technology initially regarded the implementation of such a project in a developing country as unfeasible due to its complexity. But Fidel's belief and confidence and in turn the Cuban scientists' commitment to him and to Cuban science proved to be an undeniable factors for its success.

  19. Achieving Open Access to Conservation Science

    PubMed Central

    Fuller, Richard A; Lee, Jasmine R; Watson, James E M

    2014-01-01

    Conservation science is a crisis discipline in which the results of scientific enquiry must be made available quickly to those implementing management. We assessed the extent to which scientific research published since the year 2000 in 20 conservation science journals is publicly available. Of the 19,207 papers published, 1,667 (8.68%) are freely downloadable from an official repository. Moreover, only 938 papers (4.88%) meet the standard definition of open access in which material can be freely reused providing attribution to the authors is given. This compares poorly with a comparable set of 20 evolutionary biology journals, where 31.93% of papers are freely downloadable and 7.49% are open access. Seventeen of the 20 conservation journals offer an open access option, but fewer than 5% of the papers are available through open access. The cost of accessing the full body of conservation science runs into tens of thousands of dollars per year for institutional subscribers, and many conservation practitioners cannot access pay-per-view science through their workplace. However, important initiatives such as Research4Life are making science available to organizations in developing countries. We urge authors of conservation science to pay for open access on a per-article basis or to choose publication in open access journals, taking care to ensure the license allows reuse for any purpose providing attribution is given. Currently, it would cost $51 million to make all conservation science published since 2000 freely available by paying the open access fees currently levied to authors. Publishers of conservation journals might consider more cost effective models for open access and conservation-oriented organizations running journals could consider a broader range of options for open access to nonmembers such as sponsorship of open access via membership fees. Obtención de Acceso Abierto a la Ciencia de la Conservación Resumen La ciencia de la conservación es una

  20. Abundances of Planetary Nebulae in the Outer Disk of M31

    NASA Astrophysics Data System (ADS)

    Kwitter, Karen B.; Lehman, Emma M. M.; Balick, Bruce; Henry, R. B. C.

    2012-07-01

    We present spectroscopic observations and chemical abundances of 16 planetary nebulae (PNe) in the outer disk of M31. The [O III] λ4363 line is detected in all objects, allowing a direct measurement of the nebular temperature essential for accurate abundance determinations. Our results show that the abundances in these M31 PNe display the same correlations and general behaviors as Type II PNe in the Milky Way. We also calculate photoionization models to derive estimates of central star properties. From these we infer that our sample PNe, all near the bright-end cutoff of the planetary nebula luminosity function, originated from stars near 2 M ⊙. Finally, under the assumption that these PNe are located in M31's disk, we plot the oxygen abundance gradient, which appears shallower than the gradient in the Milky Way. Partially based on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium; and on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministerio da Ciencia e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

  1. Plasma-chemical simulation of negative corona near the inception voltage

    NASA Astrophysics Data System (ADS)

    Pontiga, Francisco; Duran-Olivencia, Francisco J.; Castellanos, Antonio

    2013-09-01

    The spatiotemporal development of Trichel pulses in oxygen between a spherical electrode and a grounded plane has been simulated using a fluid approximation that incorporates the plasma chemistry of the electrical discharge. Elementary plasma processes, such as ionization, electron attachment, electron detachment, recombination between ions and chemical reactions between neutral species, are all included in a chemical model consisting of 55 reactions between 8 different species (electrons, O2+,O2-,O3-,O-, O2, O, O3). Secondary emission at the cathode by the impact of positive ions and photons is also considered. The spatial distribution of species is computed in three dimensions (2D-axysimmetrical) by solving Poisson's equation for the electric field and the continuity equations for the species, with the inclusion of the chemical gain/loss rate due to the particle interaction. The results of the simulation reveal the interplay between the different negative ions during the development of every Trichel pulse, and the rate of production of atomic oxygen and ozone by the corona discharge. This work was supported by the Consejeria de Innovacion, Ciencia y Empresa (Junta de Andalucia) and by the Ministerio de Ciencia e Innovacion, Spain, within the European Regional Development Fund contracts FQM-4983 and FIS2011-25161.

  2. Semi-analytical modelling of positive corona discharge in air

    NASA Astrophysics Data System (ADS)

    Pontiga, Francisco; Yanallah, Khelifa; Chen, Junhong

    2013-09-01

    Semianalytical approximate solutions of the spatial distribution of electric field and electron and ion densities have been obtained by solving Poisson's equations and the continuity equations for the charged species along the Laplacian field lines. The need to iterate for the correct value of space charge on the corona electrode has been eliminated by using the corona current distribution over the grounded plane derived by Deutsch, which predicts a cos m θ law similar to Warburg's law. Based on the results of the approximated model, a parametric study of the influence of gas pressure, the corona wire radius, and the inter-electrode wire-plate separation has been carried out. Also, the approximate solutions of the electron number density has been combined with a simplified plasma chemistry model in order to compute the ozone density generated by the corona discharge in the presence of a gas flow. This work was supported by the Consejeria de Innovacion, Ciencia y Empresa (Junta de Andalucia) and by the Ministerio de Ciencia e Innovacion, Spain, within the European Regional Development Fund contracts FQM-4983 and FIS2011-25161.

  3. Characterising the Venezuelan Troposphere for Radio-Astronomy Studies

    NASA Astrophysics Data System (ADS)

    Pacheco, R.; Muñoz, A. G.; Brito, A.; Cubillán, N.

    2009-05-01

    Venezuela possesses a very useful geographical location for doing Radioastronomy. Recently, the Venezuelan Government (via FIDETEL-Ministerio de Ciencia y Tecnología) has aproved to the Laboratorio de Astronomía y Física Teórica (LAFT) of La Universidad del Zulia (Venezuela) the adquisition of four 3 meter diameter parabolic dishes that will be set as a radio-interferometer receiver and that can be used for certain Radioastronomy purposes. The specifications of the instrument will be treated elsewhere (Muñoz and Hernández 2007). To this aim, as ussually, the first step is to characterize the losses due to the atmosphere, and their evolution over time. In previous works (Muñoz et al. 2004, Memoires of V RIAO/VIII OPTILAS, M10-5 Modelling Tropospheric Radio-Attenuation Parameters for Venezuela, 359; Muñoz et al. 2006, CIENCIA, Vol. 14, 4, 428) we have studied some relevant electromagnetic (e-m) attenuation parameters dueto hydrometeors and absortion gases in the lower atmosphere, focused in local telecommunication applications (surface e-m trajectories). In this work we extend our results to include the cenital and quasi-cenital e-m trajectories, characterizing thus the medium losses in the 0.4-4.0 GHz spectral window for several Venezuelan locations. We report refractivity values and their gradients, tropospheric indexes, extinction coefficients and the total rain attenuation for the whole territory under study.

  4. Making Sense of Plant Health

    NASA Technical Reports Server (NTRS)

    2001-01-01

    Ciencia, Inc. created a new device, known as a Portable Photosynthesis Analyzer, or Phase Fluorometer, that provides real-time data about the photochemical efficiency of phytoplankton and other plant forms. The commercial version of this technology is used for photosynthesis research and offers major benefits to the field of life science. This new instrument is the first portable instrument of its kind. Through a license agreement with Ciencia, Oriel Instruments, of Stratford, Connecticut, manufactures and markets the commercial version of the instrument under the name LifeSense.TMLifeSense is a 70 MHz single-frequency fluorometer that offers unrivaled capabilities for fluorescence lifetime sensing and analysis. LifeSense provides information about all varieties of photosynthetic systems. Photosynthesis research contributes important health assessments about the plant, be it phytoplankton or a higher form of plant life. With its unique sensing capabilities, LifeSense furnishes data regarding the yield of a plant's photochemistry, as well as its levels of photosynthetic activity. The user can then gain an extremely accurate estimate of the plant's chlorophyll biomass, primary production rates, and a general overview of the plant's physiological condition.

  5. 2009: the year of living dangerously

    NASA Astrophysics Data System (ADS)

    Del Puerto, C.

    2011-11-01

    Tenerife is not Jakarta. Neither is 2009 the year 1965, nor the Museo de la Ciencia y el Cosmos (Museum of Science and the Cosmos) the hotel "Indonesia", meeting point of reporters from around the world. Nor am I the journalist Jill Bryant (Sigourney Weaver) in the Australian Peter Weir film. But 2009, a year of international commitment to Astronomy (and wild economic crisis budget cuts), will be a time in space that many people will remember for how we live, what problems we face and what tools we used to discover together the Universe. Stimulating interest in the stars was our goal in the museum. Playing with all the colours of a filter wheel, our strategy. Energy and creativity were our available resources. We had to innovate and not die trying. Finally, mainstreaming was the concept, the philosophy, in exchange for bold value and ineffable endeavor. The Museo de la Ciencia y el Cosmos accepted the challenge, explored new resources for science communication and made risky bets, many of them hand in hand with the Instituto de Astrofísica de Canarias (IAC). A year later, we value the role of this museum in the film.

  6. Revision curricular a partir de un analisis comparativo de las discrepancias en los curriculos de una escuela de optometria en Puerto Rico con las competencias requeridas para las agencias de revalida y acreditacion 2004

    NASA Astrophysics Data System (ADS)

    Rivera Pacheco, Andres

    El proposito de esta investigacion, un estudio cualitativo de caso, fue comparar y contrastar el curriculo vigente de la Escuela de Optometria de la UIAPR con las competencias y estandares requeridos por las agencias de acreditacion y de revalida. Con este proposito, decidimos realizar una revision y un analisis de documentos: el prontuario de cada uno de los cursos de los curriculos implantados en el 1993 y en el 2001; las competencias y estandares establecidos por las agencias de revalida y de acreditacion; y las estadisticas en las que se analiza el porcentaje de estudiantes que aprueban cada una de las partes de los examenes de revalida entre el 1998 al 2003. Se realizaron entrevistas dirigidas para dar apoyo y complementar la revision y el analisis de estos documentos. Los participantes de las entrevistas fueron tres estudiantes de la clase de optometria del 2004 (ultima clase del curriculo del 1993); tres estudiantes de la clase de optometria del 2005 (primera clase graduanda del curriculo vigente) y tres profesores y/o directores de los Departamentos de Ciencias Basicas, Ciencias Clinicas y Cuidado al Paciente. Esta investigacion se enmarco en el modelo de evaluacion curricular de discrepancia de Malcolm Provus y en el modelo de desarrollo basado en competencias. Uno de los hallazgos mas importantes del estudio es que los cambios que se implantaron al curriculo del 2001 no han logrado que los estudiantes mejoren su ejecucion en los examenes de revalida. Por otro lado, se encontro que el curriculo vigente atiende completamente los estandares de la practica de Optometria, pero no las competencias. Esta informacion fue validada mediante el uso de una tabla de cotejo para el analisis de los cursos y de la informacion obtenida de las entrevistas. El estudio determina y concluye que existen discrepancias entre los prontuarios de los cursos del curriculo y las competencias requeridas por la agencia de revalida. Segundo, que el Departamento de Ciencias Basicas es el

  7. PREVENCIÓN DEL VIH/SIDA EN LOS CIRCUITOS DE LEVANTE HSH: UNA ASIGNATURA PENDIENTE.

    PubMed

    Barreda, Victoria; Carballo-Dieguez, Alex; Marone, Rubén; Balán, Iván; Pando, María Ángeles; Avila, María Mercedes

    2010-12-01

    A partir de un relevamiento de tipo etnográfico, se describen lugares de encuentro de HSH en la Ciudad de Buenos Aires y sus prácticas sexuales. El reconocimiento de tales espacios, así como las características que asumen en ellos los encuentros sexuales entre los HSH, plantean obstáculos específicos en la adopción de comportamientos preventivos y, asimismo, generan nuevos desafíos para las actividades de prevención. Se plantean las dificultades y debates conceptuales que la misma categoría presenta, y sus consecuencias en el abordaje preventivo y teórico-metodológico para las ciencias sociales. Además, se proponen nuevos interrogantes acerca de los alcances y las limitaciones del modelo preventivo del VIH/Sida para HSH. PMID:21874154

  8. Optics outreach activities with elementary school kids from public education in Mexico

    NASA Astrophysics Data System (ADS)

    Viera-González, P.; Sánchez-Guerrero, G.; Ruiz-Mendoza, J.; Cárdenas-Ortiz, G.; Ceballos-Herrera, D.; Selvas-Aguilar, R.

    2014-09-01

    This work shows the results obtained from the "O4K" Project supported by International Society for Optics and Photonis (SPIE) and the Universidad Autonoma de Nuevo Leon (UANL) through its SPIE Student Chapter and the Dr. Juan Carlos Ruiz-Mendoza, outreach coordinator of the Facultad de Ciencias Fisico Matematicas of the UANL. Undergraduate and graduate students designed Optics representative activities using easy-access materials that allow the interaction of children with optics over the exploration, observation and experimentation, taking as premise that the best way to learn Science is the interaction with it. Several activities were realized through the 2011-2013 events with 1,600 kids with ages from 10 to 12; the results were analyzed using surveys. One of the principal conclusions is that in most of the cases the children changed their opinions about Sciences in a positive way.

  9. Daniel A. Valencio 1928”1987

    NASA Astrophysics Data System (ADS)

    Schneider, Otto

    Daniel A. Valencio, Professor of Geophysics at Buenos Aires University, died on May 28, 1987, shortly before his 59th birthday. A pioneer of paleomagnetism and tectonophysics in Latin America, Valencio was an outstanding teacher and investigator in these disciplines.His original employment as an exploration geophysicist in Argentina and Cuba led him to become interested in solid Earth sciences in general in the 1960s. At that time, he laid the foundations of the Laboratory of Paleomagnetism at the Departamento de Ciencias Geologicas of Buenos Aires University. This facility has become a very active center of research and teaching, with emphasis on an interdisciplinary approach that includes the participation of an important group of pupils.

  10. Earth Occultation Monitoring of the Hard X-ray/Low-Energy Gamma Ray Sky with GBM

    NASA Astrophysics Data System (ADS)

    Cherry, Michael L.; Camero-Arranz, A.; Case, G. L.; Chaplin, V.; Finger, M. H.; Jenke, P. A.; Rodi, J. C.; Wilson-Hodge, C. A.; GBM Earth Occultation Team

    2012-01-01

    By utilizing the Earth occultation technique (EOT), the Gamma-Ray Burst Monitor (GBM) instrument aboard Fermi has been used to make nearly continuous full-sky observations in the 8-1000 keV energy range. The GBM EOT analysis program currently monitors an input catalog containing 235 sources. We will present the GBM catalog of sources observed in the first 3 years of the EOT monitoring program, with special emphasis on the high energy (>100 keV) and time-variable sources, in particular the Crab, Cyg X-1, and A0535+26. We will also describe the initial results of an all-sky imaging analysis of the EOT data, with comparisons to the Swift, INTEGRAL, and Fermi LAT catalogs. This work is supported by the NASA Fermi Guest Investigator program, NASA/Louisiana Board of Regents, and Spanish Ministerio de Ciencia de Innovacion.

  11. Exciton absorption of entangled photons in semiconductor quantum wells

    NASA Astrophysics Data System (ADS)

    Rodriguez, Ferney; Guzman, David; Salazar, Luis; Quiroga, Luis; Condensed Matter Physics Group Team

    2013-03-01

    The dependence of the excitonic two-photon absorption on the quantum correlations (entanglement) of exciting biphotons by a semiconductor quantum well is studied. We show that entangled photon absorption can display very unusual features depending on space-time-polarization biphoton parameters and absorber density of states for both bound exciton states as well as for unbound electron-hole pairs. We report on the connection between biphoton entanglement, as quantified by the Schmidt number, and absorption by a semiconductor quantum well. Comparison between frequency-anti-correlated, unentangled and frequency-correlated biphoton absorption is addressed. We found that exciton oscillator strengths are highly increased when photons arrive almost simultaneously in an entangled state. Two-photon-absorption becomes a highly sensitive probe of photon quantum correlations when narrow semiconductor quantum wells are used as two-photon absorbers. Research funds from Facultad de Ciencias, Universidad de los Andes

  12. Influence of thermal light correlations on photosynthetic structures

    NASA Astrophysics Data System (ADS)

    de Mendoza, Adriana; Manrique, Pedro; Caycedo-Soler, Felipe; Johnson, Neil F.; Rodríguez, Ferney J.; Quiroga, Luis

    2014-03-01

    The thermal light from the sun is characterized by both classical and quantum mechanical correlations. These correlations have left a fingerprint on the natural harvesting structures developed through five billion years of evolutionary pressure, specially in photosynthetic organisms. In this work, based upon previous extensive studies of spatio-temporal correlations of light fields, we hypothesize that structures involving photosensitive pigments like those present in purple bacteria vesicles emerge as an evolutionary response to the different properties of incident light. By using burstiness and memory as measures that quantify higher moments of the photon arrival statistics, we generate photon-time traces. They are used to simulate absorption on detectors spatially extended over regions comparable to these light fields coherence length. Finally, we provide some insights into the connection between these photo-statistical features with the photosynthetic membrane architecture and the lights' spatial correlation. Facultad de Ciencias Uniandes.

  13. Committees and sponsors

    NASA Astrophysics Data System (ADS)

    2011-10-01

    International Advisory Committee Richard F CastenYale, USA Luiz Carlos ChamonSão Paulo, Brazil Osvaldo CivitareseLa Plata, Argentina Jozsef CsehATOMKI, Hungary Jerry P DraayerLSU, USA Alfredo Galindo-UribarriORNL & UT, USA James J KolataNotre Dame, USA Jorge López UTEP, USA Joseph B NatowitzTexas A & M, USA Ma Esther Ortiz IF-UNAM Stuart PittelDelaware, USA Andrés SandovalIF-UNAM Adam SzczepaniakIndiana, USA Piet Van IsackerGANIL, France Michael WiescherNotre Dame, USA Organizing Committee Libertad Barrón-Palos (Chair)IF-UNAM Roelof BijkerICN-UNAM Ruben FossionICN-UNAM David LizcanoININ Sponsors Instituto de Ciencias Nucleares, UNAMInstituto de Física, UNAMInstituto Nacional de Investigaciones NuclearesDivisión de Física Nuclear de la SMFCentro Latinoamericano de Física

  14. Effect of Seeding Particles on the Shock Structure of a Supersonic Jet

    NASA Astrophysics Data System (ADS)

    Porta, David; Echeverría, Carlos; Stern, Catalina

    2012-11-01

    The original goal of our work was to measure. With PIV, the velocity field of a supersonic flow produced by the discharge of air through a 4mm cylindrical nozzle. The results were superposed to a shadowgraph and combined with previous density measurements made with a Rayleigh scattering technique. The idea was to see if there were any changes in the flow field, close to the high density areas near the shocks. Shadowgraphs were made with and without seeding particles, (spheres of titanium dioxide). Surprisingly, it was observed that the flow structure with particles was shifted in the direction opposite to the flow with respect to the flow structure obtained without seeds. This result might contradict the belief that the seeding particles do not affect the flow and that the speed of the seeds correspond to the local speed of the flow. We acknowledge support from DGAPA UNAM through project IN117712 and from Facultad de Ciencias UNAM.

  15. More than science: family learning in a Mexican science museum

    NASA Astrophysics Data System (ADS)

    Briseño-Garzón, Adriana

    2013-06-01

    Latin American audiences living in their countries of origin are poorly understood as museum learners due to the scarcity of research in this field. Through a case study approach, I investigate and report on the ways of learning of 20 Mexican family groups. In particular, I examine the influence of the Mexican sociocultural context on the participant family members' learning outcomes from a Mexican science museum. Conducted in Universum Museo de las Ciencias, a science museum located in Mexico City, this research study is based on the premise that understanding the role of the sociocultural elements of learning is essential to understanding the nature of learning in museums. The cognitive and social outcomes of the participants are discussed in the light of the sociocultural elements that define Mexicans as museum learners.

  16. Long-pulse magnetic field facility at Zaragoza

    NASA Astrophysics Data System (ADS)

    Algarabel, P. A.; del Moral, A.; Martín, C.; Serrate, D.; Tokarz, W.

    2006-11-01

    The long-pulse magnetic field facility of the Laboratorio de Magnetismo - Instituto de Ciencia de Materiales de Aragón (Universidad de Zaragoza-CSIC) produces magnetic fields up to 31, with a pulse duration of 2.2s. Experimental set-ups for measurements of magnetization, magnetostriction and magnetoresistance are available. The temperature can be controlled between 1.4 and 335 K, being the inner bore of the He cryostat of 22.5 mm. Magnetization is measured using the mutual induction technique, the magnetostriction is determined with the strain-gage and the capacitive cantilever methods, and the magnetoresistance is measured by means of the aclock-in technique in the 4-probes geometry. An overview of the facility will be presented and the presently available experimental techniques will be discussed.

  17. [Transportation networks and means in the development of scientific expeditions in Argentina (1850-1910)].

    PubMed

    Farro, Máximo E

    2008-01-01

    The article explores the relation between the advance of transportation technology and the development of scientific expeditions between the late nineteenth and early twentieth centuries in Argentina. Expansion of the railway network on a national scale impacted the development of the earth sciences by facilitating access to distant places by scientific institutions located in Córdoba, Buenos Aires, and La Plata and also by simplifying the movement of equipment, scientific collections, and personnel. Hermann Burmeister's expedition (1857-60), expeditions by scientists from the Academia Nacional de Ciencias de Córdoba, and archeological digs in the northwestern provinces, organized by scientific institutions headquartered in Buenos Aires and La Plata, serve as examples. PMID:19241719

  18. [Analysis of the continuity, circulation and productivity of the Revista Española de Quimioterapia].

    PubMed

    Gimeno Sieres, E

    2007-06-01

    The primary objective of this study was to compare some of the bibliometric indicators of the continuity, circulation and productivity of the Revista Espanola de Quimioterapia up to 2003 with other spanish journals of Pharmacy and Pharmacology. This was done by reviewing periodicals directories, such as the ISSN (International Standard Serial Number/Número Internacional Normalizado de Publicaciones Seriadas) and ULRICH'S (Periodicals Directory), as well as the CDU (Classification Universal Decimal), national and international databases including IME (Indice Médico Español), ICYT (Indice Espanol de Ciencia y Tecnologia), IPA (International Pharmaceutical Abstracts), SCI Expanded (Science Citation Index Expanded), MEDLINE (Index Medicus), EMBASE (Excerpta Medica), BIOSIS PREVIEWS, ANALYTICAL ABSTRACTS, FSTA (Food Science and Technology Abstracts), SCIFINDER SCHOLAR and CHEMISTRY CITATION INDEX. According to the results, the Revista Española de Quimioterapia, in publication for 15 years, is widely distributed and has a good rating among other scientific journals of the same discipline. PMID:17893754

  19. Wind profiler installed in Antarctica

    NASA Astrophysics Data System (ADS)

    Balsley, B. B.; Carey, J.; Woodman, R. F.; Sarango, M.; Urbina, J.; Rodriguez, R.; Ragaini, E.

    A VHF (50 MHz) wind profiler was installed in Antarctica at the Peruvian Base “Machu Picchu” on King George Island from January 21 to 26. The wind profiler will provide a first look at atmospheric dynamics over the region.The profiler—the first of its kind in Antarctica—is a National Science Foundationsponsored cooperative project of the University of Colorado, the Geophysical Institute of Peru, the University of Piura (Peru), and the Peruvian Navy. This venture was also greatly facilitated by Peru's Comision Nacional de Asuntos Antartidos and Consejo Nacional de Ciencias y Tecnologia, with additional logis tics support provided by the Argentinean Navy and the Uruguayan Air Force.

  20. Investigación del USGS sobre el ecosistema de arrecifes de coral en el Atlántico

    USGS Publications Warehouse

    Kuffner, Ilsa B.; Yates, Kimberly K.; Zawada, David G.; Richey, Julie N.; Kellogg, Christina A.; Toth, Lauren T.; Torres-Garcia, Legna M.

    2015-01-01

    Los arrecifes de coral son estructuras sólidas, biomineralizadas que protegen comunidades costeras actuando como barreras protectoras de peligros tales como los huracanes y los tsunamis. Estos proveen arena a las playas a través de procesos naturales de erosión, fomentan la industria del turismo, las actividades recreacionales y proveen hábitats pesqueros esenciales. La conti-nua degradación mundial de ecosistemas de arrecifes de coral está bien documentada. Existe la necesidad de enfoque y organización de la ciencia para entender los procesos complejos físicos y biológicos e interacciones que están afectando el estado de los arrecifes coralinos y su capacidad para responder a un entorno cambiante.

  1. A case of Amelogenin Y-null: a simple primer binding site mutation or unusual genetic anomaly?

    PubMed

    Davis, Carey; Illescas, María; Tirado, Carmen; Lopez, Roberto; Budowle, Bruce; Cruz, Tracey Dawson

    2012-11-01

    A thirteen year old boy was murdered by a gunshot wound to the head. In order to confirm identity of the boy, samples were sent to the Instituto de Ciencias Forenses de Puerto Rico (PR-ICF) DNA laboratory. Autosomal DNA results exhibited only an X at the Amelogenin locus, whereas the autopsy results reported the child to be anatomically male. The sample was amplified with four separate YSTR marker systems. While a full Y-STR profile for the father of the boy was obtained, the boy only amplified at STR markers on the p arm of the Y chromosome. Theories that could account for this large absence of Y-STR results include an X-Y translocation or Yp isochromosome. PMID:22721879

  2. The case for policy-relevant conservation science

    PubMed Central

    Rose, David C

    2015-01-01

    Drawing on the “evidence-based” (Sutherland et al. 2013) versus “evidence-informed” debate (Adams & Sandbrook 2013), which has become prominent in conservation science, I argue that science can be influential if it holds a dual reference (Lentsch & Weingart 2011) that contributes to the needs of policy makers whilst maintaining technical rigor. In line with such a strategy, conservation scientists are increasingly recognizing the usefulness of constructing narratives through which to enhance the influence of their evidence (Leslie et al. 2013; Lawton & Rudd 2014). Yet telling stories alone is rarely enough to influence policy; instead, these narratives must be policy relevant. To ensure that evidence is persuasive alongside other factors in a complex policy-making process, conservation scientists could follow 2 steps: reframe within salient political contexts and engage more productively in boundary work, which is defined as the ways in which scientists “construct, negotiate, and defend the boundary between science and policy” (Owens et al. 2006:640). These will both improve the chances of evidence-informed conservation policy. El Caso para la Ciencia de la Conservación con Relevancia Política Resumen A partir del debate “con base en evidencia” (Sutherland et al. 2013) versus “informado con evidencia” (Adams & Sandbrook 2013), debate que se ha vuelto prominente en la ciencia de la conservación, argumento que la ciencia puede ser influyente si mantiene una referencia dual (Lentsch & Weingart 2011) que contribuya a las necesidades de quienes hacen la política a la vez que mantiene un rigor técnico. En línea con dicha estrategia, los científicos de la conservación cada vez reconocen más la utilidad de construir narrativas con las cuales pueden mejorar la influencia de sus evidencias (Leslie et al. 2013; Lawton & Rudd 2014). Sin embargo, sólo contar historias rara vez es suficiente para influir sobre la política; en su lugar, estas

  3. PREVENCIÓN DEL VIH/SIDA EN LOS CIRCUITOS DE LEVANTE HSH: UNA ASIGNATURA PENDIENTE1

    PubMed Central

    Barreda, Victoria; Carballo-Dieguez, Alex; Marone, Rubén; Balán, Iván; Pando, María Ángeles; Ávila, María Mercedes

    2011-01-01

    Resumen A partir de un relevamiento de tipo etnográfico, se describen lugares de encuentro de HSH en la Ciudad de Buenos Aires y sus prácticas sexuales. El reconocimiento de tales espacios, así como las características que asumen en ellos los encuentros sexuales entre los HSH, plantean obstáculos específicos en la adopción de comportamientos preventivos y, asimismo, generan nuevos desafíos para las actividades de prevención. Se plantean las dificultades y debates conceptuales que la misma categoría presenta, y sus consecuencias en el abordaje preventivo y teórico-metodológico para las ciencias sociales. Además, se proponen nuevos interrogantes acerca de los alcances y las limitaciones del modelo preventivo del VIH/Sida para HSH. PMID:21874154

  4. Application of E-learning tools for the teaching of Natural Science. A case related to Astronomy

    NASA Astrophysics Data System (ADS)

    Goldes, G.; Gallino, M.; Britos, D.; Lago, D.; Tavella, G.; Vidal, E.; Morales, S.; Nicotra, M.

    The requirements, recent experiences and projections of the application of virtual learning techniques and environments for the teaching of basic sciences at the National University of Córdoba, Argentina, are described. The reasons to still consider basic science E-learning as an institutional vacancy area are discussed. Present activities designed to revert this situation are also discussed. A particular experience about the application of tics as a complementary resource for teaching astronomy at the University is described and discussed on the basis of both strengths and limitations. The organization of E-learning activities at the Faculty of Engineering, Biology and Geology ("Facultad de Ciencias Exactas, Físicas y Naturales") is discussed in some detail.

  5. Buoyancy and blockage effects on transient laminar opposing mixed convection heat transfer from two horizontal confined isothermal cylinder in tandem

    NASA Astrophysics Data System (ADS)

    Martínez-Suástegui, Lorenzo; Salcedo, Erick; Cajas, Juan; Treviño, César

    2015-11-01

    Transient mixed convection in a laminar cross-flow from two isothermal cylinders in tandem arrangement confined inside a vertical channel is studied numerically using the vorticity-stream function formulation of the unsteady two-dimensional Navier-Stokes and energy equations. Numerical experiments are performed for a Reynolds number based on cylinder diameter of Re = 200, Prandtl number of Pr = 7, blockage ratio of D/H = 0.2, a pitch-to-diameter ratio of L/D = 2, and several values of buoyancy strength or Richardson number Ri = Gr/Re2. The results reported herein demonstrate how the wall confinement, interference effects and opposing buoyancy affect the flow structure and heat transfer characteristics of the cylinder array. This research was supported by the Consejo Nacional de Ciencia y Tecnología (CONACYT), Grant number 167474 and by the Secretaría de Investigación y Posgrado del IPN, Grant number SIP 20141309.

  6. Fountain rainbows.

    PubMed

    Gedzelman, Stanley David; Hernández-Andrés, Javier

    2008-12-01

    We present the first measurements of radiance spectra of rainbows. The bows on two sunny days (3 and 6 June 2008) were produced by the fountain in the Parque de las Ciencias, Granada, Spain, that consists of a rectangular perimeter of 40 spray nozzles. Optical thickness of the spray from each nozzle was approximately 0.5. Spectral purity of the primary bow was highest for orange and blue, reaching values of 23% and 7%, respectively, while skylight 90 degrees from the Sun had a color purity of 34% (on 6 June). The secondary bow had much lower color purity with red absent because the regions around the bows and in Alexander's dark band were pale blue. The narrow sickle shape of the chromaticity curves for the primary bows and the absence of supernumerary bows indicated that the drop radius was between 0.2 and 0.4 mm. PMID:19037346

  7. The la Plata Astronomical Data Center

    NASA Astrophysics Data System (ADS)

    Marraco, H. G.

    1990-11-01

    RESUMEN. El Centro de Datos Astron6micos tiene su sede en la Facuitad de Ciencias Astron6micas y Geofisicas d la Universidad Nacional de La Plata y funciona por convenio entre esta facultad y el Centre des Stellaires de la Universite' Louis Pasteur en Estrasburgo (CDS), Francia. La finalidad de este centro es la de proveer a los astr6nomos del area con copias de los alrededor de 500 acumulados y/o preparados por el CDS a la vez que promover la producci6n y/o acumulaci6n de en el rea. Para la realizaci6n de esta tarea se cuenta con el apoyo del Centro Superior para el Procesamiento de la Informaci6n (CESPI) de la UNLP cuyos equipos se describen. Las tareas que se estan realizando incluyen la distribuci6n de SIMBAD a los astr6nomos argentinos y se efectuan ensayos de distribuci6n en linea de CD-ROM TEST DISK del Astronomical Data Center (ADC) de la NASA que contiene los 31 mas solicitados por los astr6nomos de todo el mundo. ABSTRACl The La Plata Astronomical Data Center operates by an agreement between the Facultad de Ciencias Astron6micas y Geofisicas at La Plata University and the Centre des Donnees Stellaires of Louis Pasteur University at Strasbourg (CDS), France. The purpose of the Center is to provide to the area astronomers with copies of the catalogs they need amongst those stored and/or prepared at CDS. At the same time the center will act of the astronomical data produced within its area. K words: DATA ANALYSIS

  8. The Young Outer Disk of M83

    NASA Astrophysics Data System (ADS)

    Davidge, T. J.

    2010-08-01

    Deep near-infrared images recorded with NICI on Gemini South are used to investigate the evolved stellar content in the outer southeast quadrant of the spiral galaxy M83. A diffuse population of asymptotic giant branch (AGB) stars is detected, indicating that there are stars outside of the previously identified young and intermediate age star clusters in the outer disk. The brightest AGB stars have M K >= -8, and the AGB luminosity function (LF) is well matched by model LFs that assume ages <=1 Gyr. The specific star formation rate (SFR) during the past few Gyr estimated from AGB star counts is consistent with that computed from mid-infrared observations of star clusters at similar radii, and it is concluded that the disruption timescale for star clusters in the outer disk is Lt1 Gyr. The LF and specific frequency of AGB stars vary with galactocentric radius, in a manner that is indicative of lower luminosity-weighted ages at larger radii. Modest numbers of red supergiants are also found, indicating that there has been star formation during the past 100 Myr, while the ratio of C stars to M giants is consistent with that expected for a solar metallicity system that has experienced a constant SFR for the past few Gyr. The results drawn from the properties of resolved AGB stars are broadly consistent with those deduced from integrated light observations in the UV. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a co-operative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council of Canada (Canada), CONICYT (Chile), the Australian Research Council (Australia), the Ministerio da Ciencia e Technologia (Brazil), and the Ministerio de Ciencia, Tecnologia e Innovacion Productiva (Argentina).

  9. Accretion Rates on Pre-main-sequence Stars in the Young Open Cluster NGC 6530

    NASA Astrophysics Data System (ADS)

    Gallardo, José; del Valle, Luciano; Ruiz, María Teresa

    2012-01-01

    It is well accepted that during the star formation process, material from a protoplanetary disk is accreted onto the central object during the first ~1-5 Myr. Different authors have published measurements of accretion rates for young low- and intermediate-mass stars in several nearby star-forming regions (SFRs). Due to its somewhat larger distance, the SFR M8 (the Lagoon Nebula) has not been studied to the same extent, despite its abundant population of young stellar objects. We have obtained optical band low-resolution spectra of a sample of pre-main-sequence stars in the open cluster NGC 6530 located in the aforementioned nebulae using the Gemini Multi Object Spectrograph at Gemini-South in multi-object mode. Spectra cover the Hα emission line used to measure the accretion rate, following the method presented by Natta et al. The observed spectral characteristics are fully consistent with pre-main-sequence stars, showing lithium absorption lines, which are very common in young stellar objects, as well as prominent and broad Hα emission lines, indicating a T Tauri evolutionary stage. This work presents the first determinations of mass accretion rates of young stellar objects in the open cluster NGC 6530, confirming that they are classical T Tauri stars going through the accretion phase. These observations contribute to a better understanding of the stellar content and evolutionary phase of the very active Lagoon Nebula SFR. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciencia e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva

  10. Ambient seismic noise levels: A survey of the permanent and temporary seismographic networks in Morocco, North Africa

    NASA Astrophysics Data System (ADS)

    El Fellah, Y.; Khairy Abd Ed-Aal, A.; El Moudnib, L.; Mimoun, H.; Villasenor, A.; Gallart, J.; Thomas, C.; Elouai, D.; Mimoun, C.; Himmi, M.

    2013-12-01

    Abstract The results, of a conducted study carried out to analyze variations in ambient seismic noise levels at sites of the installed broadband stations in Morocco, North Africa, are obtained. The permanent and the temporary seismic stations installed in Morocco of the Scientific Institute ( IS, Rabat, Morocco), institute de Ciencias de la Tierra Jaume almera (ICTJA, Barcelona, Spain) and Institut für Geophysik (Munster, Germany) were used in this study. In this work, we used 23 broadband seismic stations installed in different structural domains covering all Morocco from south to north. The main purposes of the current study are: 1) to present a catalog of seismic background noise spectra for Morocco obtained from recently installed broadband stations, 2) to assess the effects of experimental temporary seismic vault construction, 3) to determine the time needed for noise at sites to stabilize, 4) to establish characteristics and origin of seismic noise at those sites. We calculated power spectral densities of background noise for each component of each broadband seismometer deployed in the different investigated sites and then compared them with the high-noise model and low-noise Model of Peterson (1993). All segments from day and night local time windows were included in the calculation without parsing out earthquakes. The obtained results of the current study could be used forthcoming to evaluate permanent station quality. Moreover, this study could be considered as a first step to develop new seismic noise models in North Africa not included in Peterson (1993). Keywords Background noise; Power spectral density; Model of Peterson; Scientific Institute; Institute de Ciencias de la Tierra Jaume almera; Institut für Geophysik

  11. Evolution of Electron Transport Chains During the Anaerobic to Aerobic Transition on Early Earth

    NASA Astrophysics Data System (ADS)

    Sepúlveda, R.; Ortiz, R.; Holmes, D. S.

    2015-12-01

    Sepulveda, R., Ortiz R. and Holmes DS. Center for Bioinformatics and Genome Biology, Fundacion Ciencia y Vida, and Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago, Chile.According to several models, life emerged on earth in an anoxic environment where oxygen was not available as a terminal electron acceptor for energy generating reactions. After the Great Oxidation Event (GOE) about 2.4 billion years ago, or perhaps even before the GOE, oxygen became the most widespread and efficient terminal electron acceptor and was accompanied by the evolution of a number of redox proteins that could deliver electrons to reduce oxygen to water. Where did these proteins come from? One hypothesis is that they evolved by the neofunctionalization of previously existing redox proteins that had been used in anaerobic conditions as terminal electron donors to reduce compounds such as perchlorate, nitric oxide or iron. We have used a number of bioinformatic tools to explore a large number of genomes looking for discernable signals of such redeployment of function. A Perl pipeline was designed to detect sequence similarity, conserved gene context, remote homology detection, identification of domains and functional evolution of electron carrier proteins from extreme acidophiles, including the small blue copper protein rusticyanin (involved in FeII oxidation), cytochrome oxidase subunit II and quinol-dependent nitric oxide reductase (qNOR). The protein folds and copper binding sites of rusticyanin are conserved in cytochrome oxidase aa3 subunit II, a protein complex that is responsible for the final passage of electrons to reduce oxygen. Therefore, we hypothesize that rusticyanin, cytochrome oxidase II and qNOR are evolutionarily related. Acknowledgments: Fondecyt 1130683.

  12. Effect of acclimation to outdoor condition on the sexual performance of mass-produced Medflies (Diptera: Tephritidae)

    SciTech Connect

    Pereira, R.; Silva, N.; Quintal, C.; Abreu, R.; Andrade, J.; Dantas, L.

    2007-03-15

    Application of the sterile insect technique (SIT) as part of integrated area-wide programs to control the Mediterranean fruit fly (medfly) Ceratitis capitata (Wiedemann) require that the released males attract wild females and transfer sterile sperm. However, knowledge about male sexual performance after they are released is scarce. We conducted a study to evaluate male sexual performance in field cage tests, according to standard quality control procedures. Mass-reared 5-d-old sterile males from the genetic sexing strain VIENNA 7mix2000 were acclimated for 0, 1, and 3 d to outdoor conditions before competing with wild males for wild females. Although the proportion of mating (PM) in the test was satisfactory, the resulting relative sterility index (RSI) data showed no significant differences among the treatments. The data indicate that pre-conditioning males to outdoor conditions in Madeira did not confer an advantage in field cage sexual performance. (author) [Spanish] La aplicacion de la tecnica del insecto esteril (TIE) como parte de un programa integrado de amplio efecto para el control de la mosca mediterranea de la fruta Ceratitis capitata (Wiedemann) requiere que los machos liberados atraigan las hembras naturales y transfieran su esperma. Sin embargo, el conocimiento del desempeno sexual de los machos despues de ser liberados es muy escaso. Nosotros realizamos un estudio para evaluar el desempeno sexual de los machos en pruebas usando jaulas del campo, segun los procedimientos estandardizados de calidad. Machos esteriles de 5 dias de edad de la raza que separa los sexos geneticamente VIENNA 7mix2000 criados en masa fueron aclimatados por 0, 1 y 3 dias en condiciones de campo antes de competir con machos naturales para las hembras naturales. Aunque la proporcion del apareamiento en la prueba fue satisfactorio, el indice relativo de esterilidad (IRS) resultante no mostro ninguna diferencia significativa entre los tratamientos. Los datos indicaron que al

  13. Chemical Soil Degradation n the Area of the Głogów Copper Smelter Protective Forest/ Degradacja Ziemi Na Terenach Byłej Strefy Ochronnej Huty Miedzi Głogów

    NASA Astrophysics Data System (ADS)

    Kostecki, Jakub; Greinert, Andrzej; Drab, Michał; Wasylewicz, Róża; Walczak, Barbara

    2015-06-01

    Earth surface is under the continous influence of the environmental factors - both natural and anthropogenic. The significant impact on the environment can be noted in areas adjacent to the metal industry plants, in a consequence of pollutants emission, especially dusts containing the heavy metals, into the atmosphere,. In the surroundings of Głogów Copper Smelter (GCS) elevated amounts of copper and lead has been noted. In the soils of the test sites were found up to 5250 mg kg-1 Cu and 1290 mg kg-1 Pb. The forest litter contained 3.3-5.1 more Cu and 3.9-8.6 Pb than the humic horizon of the soil. Analyse of the different soils covering the GCS protective forest area let specify the stabilising role of particle size distribution, TOC content and the soil reaction to Cu and Pb migration in the environment. Powierzchnia ziemi jest nieustannnie narażona na oddziaływania o charakterze naturalnym i antropogenicznym. Znaczące oddziaływanie jest łatwo zauważalne na terenach przemysłowych. Szczególnie na obszarach objętych wydobyciem i przeróbką metali. Na terenach przyległych do Huty Miedzi Głogów stwierdzono wysoką koncentrację miedzi i ołowiu sięgającą 5250 mg kg-1 Cu i 1290 mg kg-1 Pb. Poziom ściółki leśnej zawierał 3,3-5,1 raza więcej Cu i 3,9-8,6 Pb niż poziom próchniczny analizowanych gleb. Analiza różnych gleb pokrywających las ochronny HMG pozwoliła wskazać na znaczącą rolę składu granulometrycznego, zawartości węgla organicznego oraz odczynu na stabilizację migracji Cu i Pb w środowisku.

  14. [Efficacy of elective cerclage in patients with cervical incompetence and associated risk factors].

    PubMed

    Nava Flores, Jorge; Morales Toia, Mafalda Elizabeth; Veloz Martínez, Guadalupe; Hernández-Valencia, Marcelino

    2003-07-01

    Cervical incompetence (CI) is considered as a defect of the cervical estroma that takes to the inability of the uterine neck to retain an intra-uterine pregnancy until the viability of the fetus, with an incidence from 0.05% to 1% of all the pregnancies. This defect in the cervix is due to obstetrics trauma, such as disfunctional and anatomical causes. The failure of cervical cerclage have been reported up to 20%, this study was carried out to determine the baby born and procedure complications. All patients demanding attention at the Gynecology and Obstetrics Hospital of the Medical Center La Raza, with diagnosis of CI were included in this study. Thus, 36 patients were included, with 30.1 +/- 4.2 (M +/- SD) year-old age; the cerclage was performed in the second trimester, in order to extend the pregnancy with an average of 18.1 +/- 6.5 weeks until the moment of the interruption of the pregnancy. The 61.1% arrived to the term gestation, in 23 of the cases (63.8%) were born with more than 2500 g of weight, and 24 cases also presented a recurrence among 2 to 5 abortions. The most frequent complication was the threat of preterm childbirth and in patient with antecedents of previous obstetric complications was obtained a relative risk (RR) of 3.8 to present CI, moreover it was also observed at the beginning and the end of the obstetric life the probability of CI has a RR 1.6, with a positive correlation between the gestational age at the application of the cerclage and the continuation of the pregnancy (p < 0.05) after the week 16 of gestation. The cerclage application in the second trimester of pregnancy overcomes the risks of the surgical procedure and does not have adverse effects on the product. The main indicators of success are the cerclage application to smaller gestational age, into the second and third gestation, as well as the presence of the smallest number of complicated obstetric events, therefore great part of the obstetric decision to apply a cerclage

  15. [Maternal and fetal morbidity in patients with premature rupture of the membrane after 27-week gestation. Causes and costs].

    PubMed

    Nava Flores, Jorge; Enríquez Miranda, Ma Cecilia; Hernández-Valencia, Marcelino

    2003-07-01

    Premature rupture of the membranes (PROM) occurs in a third of the childbirths preterm, this represents 8% of all pregnancies, with same morbidity and mortality in developing and developed countries, PROM is the more common cause of neonatal morbidity and mortality, making this obstetric complication a worldwide problem of health, since it contributes to the economic problem for the cost risen in medical attention for both, mothers and live birth. PROM is considered a mutifactorial entity. This study was carried out in the Hospital de Ginecología y Obstetricia of the Centro Médico "La Raza" in Mexico City, where women entered in serial form with pregnancies from 27 to 34 weeks of gestation and spontaneous PROM, without any other pathology. 120 patients were included, with 26.8 +/- 5.9 year-old age. The gestational age with more frequency of PROM were from 30 to 33 weeks, 22.5% of the patients had 4 days with PROM, 6 of this cases arrived up to 13 days with this complication at delivery. 2.5% of the patients presented deciduitis, with adequated response to the use of antibiotics. When analyzing the hospital stay, a stay was observed from 4 to 7 days (5.26 +/- 1.96 M +/- SD), with a total cost for maternal stay of 2 millions 445,650 pesos. Those babies born had an average of 23 days of hospital stay and the total cot of the days of stay was 4 millions 963,978 pesos. Other costs were the attention of maternal and pediatrics specialty, the obstetric resolution of the pregnancy, obstetric ultrasonography and crystallographies. Thus, the total costs of the attention of this complication in these patients with PROM was of 10 millions 296,988 pesos. The international reference is the American dollar that was in 10 pesos for dollar to the moment of this study. The maternal morbidity is low to that described in previous studies, but in spite of the exhaustive efforts on the prevention, prediction, diagnosis and treatment, the premature rate due to PROM has not diminished

  16. Los manuales de quimica en Espana (1788--1845): Protagonistas, terminologia, clasificaciones y orden pedagogico

    NASA Astrophysics Data System (ADS)

    Munoz Bello, Maria Rosa

    La presente tesis doctoral es una investigacion sobre los manuales de quimica utilizados en Espana de 1788 a 1845. Este trabajo proporciona una perspectiva general de un tema relevante en las ultimas decadas en Historia de la Ciencia, el estudio de los libros de texto. De acuerdo con las ultimas investigaciones realizadas en este terreno, el acto pedagogico es considerado como un proceso creativo, como espacio de encuentro de actores e intereses muy diversos, matizando las ideas defendidas por Thomas S. Kuhn. Recordemos que segun Kuhn, los libros de texto ofrecen una vision consensuada y normalizada del estado de la ciencia de su epoca, por lo que sus autores eliminan deliberadamente toda controversia y presentan asi una imagen distorsionada de la actividad cientifica. En cambio, se ha mostrado, por ejemplo, que en la ensenanza participan no solamente profesores y alumnos sino tambien otros muchos actores y todos ellos no unicamente con intereses puramente pedagogicos sino tambien con diversos intereses politicos y economicos que pueden conocerse a traves del estudio de los manuales. En esta tesis se pretende analizar los manuales de quimica en Espana desde 1788 hasta 1845. Para poder llevar a cabo la investigacion ha sido necesario precisar el objeto de estudio (libro de texto de quimica) durante el periodo estudiado (1788-1845) ya que no es adecuado adoptar la imagen actual de una disciplina que sufrio sustanciales cambios durante la epoca estudiada. Esta investigacion se centra en un momento especialmente importante para la quimica y que algunos historiadores han llegado a considerar "revolucionario". Durante estos anos se produjo un cambio importante en las teorias quimicas sobre la combustion y el concepto de elemento, asi como una reforma terminologica que originaron la aparicion de importantes controversias. Ademas, debido a la relacion de la quimica con otras disciplinas como la historia natural o la fisica ha sido necesario restringir el objeto de estudio

  17. Sky Observation with the Use of the Software Stellarium for Teaching Astronomy in Classes of Youth and Adult Education. (Spanish Title: Observación del Cielo con la Utilización del Software Stellarium en Las Clases de Educación de Jóvenes y Adultos.) Observação do Céu Aliada À Utilização do Software Stellarium no Ensino de Astronomia em Turmas de Educação de Jovens e Adultos (EJA)

    NASA Astrophysics Data System (ADS)

    Oliveira Bernardes, Adriana

    2010-12-01

    The aim of this paper is to present a project developed through a partnership between the Astronomy Club of Itaocara Marcos Pontes (CAIMP) and Jaime de Souza Queiroz College, both located in the town of Itaocara, in the Northwest Fluminense, to disseminate Astronomy in adult education (Education for Youth and Adult). Given the interdisciplinary nature of Astronomy, we have developed this work to motivate the learning of this science by students in adult education, who attend the subjects Chemistry, Physics and Biology. Initially, we conducted a research in the school to assess the prior knowledge of Astronomy class of adult education, noting that there is little knowledge of basic concepts of the discipline. With these data, we were able to elaborate several activities that would enable a greater involvement of students with this science, performing in the school a work of improvement of scientific literacy, whose activities will be presented in this article. El objetivo de este artículo es presentar los resultados de un proyecto realizado por el Club de Astronomía de Itaocara "Marcos Pontes" (CAIMP), conjuntamente con el Colegio Estatal" Jaime de Souza Queiroz", ambos de la ciudad de Itaocara (Noroeste Fluminense - RJ, Brasil), para la difusión de la Astronomía entre los estudiantes, tanto adultos como adolescentes. Teniendo en cuenta la naturaleza interdisciplinaria de la Astronomía, se determinó motivar el estudio de esta ciencia en los estudiantes adultos de nivel secundario matriculados en las asignaturas de Química, Física y Biología. Como primer paso, se investigó el grado de conocimiento sobre astronomía del estudiante. Este estudio inicial mostró niveles de conocimiento muy bajos de los conceptos básicos de esta ciencia, muchos de los cuales deberían haber sido asimilados dentro del plan curricular del curso de Física. Este estudio previo permitió determinar las actividades adecuadas para promover un mayor envolvimiento de los estudiantes

  18. PREFACE: XXXV Symposium on Nuclear Physics

    NASA Astrophysics Data System (ADS)

    Padilla-Rodal, E.; Bijker, R.

    2012-09-01

    for Mexican students to present their current research and interact with the visiting scientists. The present volume contains 21 research articles based on invited talks presented at the symposium. We cannot thank enough to all the authors for their enthusiastic contribution, to the anonymous referees for the time they devoted to the review process, which helped us to maintain the high standard of the Conference Proceedings. Finally we would like to thank the International Advisory Committee and the Sponsoring Organizations that made this event possible. E Padilla-Rodal and R Bijker Editors Conference photograph International Advisory Committee Osvaldo Civitarese, Universidad Nacional de La Plata, Argentina Jerry P Draayer, Louisiana State University, USA Alfredo Galindo-Uribarri, Oak Ridge National Laboratory, USA Paulo Gomes, Universidade Federal Fluminense, Brazil Piet Van Isacker, GANIL, France James J Kolata, University of Notre Dame, USA Reiner Krücken, TRIUMF, Canada Jorge López, The University of Texas at El Paso, USA Stuart Pittel, University of Delaware, USA W Michael Snow, Indiana University, USA Adam Szczepaniak, Indiana University, USA Michael Wiescher, University of Notre Dame, USA Organizing Committee Elizabeth Padilla-Rodal (Chair), Instituto de Ciencias Nucleares, UNAM, Mexico Roelof Bijker, Instituto de Ciencias Nucleares, UNAM, Mexico Sponsoring Organizations División de Física Nuclear, SMF Dirección General de Asuntos de Personal Académico, UNAM Centro Latino-Americano de Física Instituto de Ciencias Nucleares, UNAM Instituto de Física, UNAM Instituto Nacional de Investigaciones Nucleares

  19. Los manuales de quimica en Espana (1788--1845): Protagonistas, terminologia, clasificaciones y orden pedagogico

    NASA Astrophysics Data System (ADS)

    Munoz Bello, Maria Rosa

    La presente tesis doctoral es una investigacion sobre los manuales de quimica utilizados en Espana de 1788 a 1845. Este trabajo proporciona una perspectiva general de un tema relevante en las ultimas decadas en Historia de la Ciencia, el estudio de los libros de texto. De acuerdo con las ultimas investigaciones realizadas en este terreno, el acto pedagogico es considerado como un proceso creativo, como espacio de encuentro de actores e intereses muy diversos, matizando las ideas defendidas por Thomas S. Kuhn. Recordemos que segun Kuhn, los libros de texto ofrecen una vision consensuada y normalizada del estado de la ciencia de su epoca, por lo que sus autores eliminan deliberadamente toda controversia y presentan asi una imagen distorsionada de la actividad cientifica. En cambio, se ha mostrado, por ejemplo, que en la ensenanza participan no solamente profesores y alumnos sino tambien otros muchos actores y todos ellos no unicamente con intereses puramente pedagogicos sino tambien con diversos intereses politicos y economicos que pueden conocerse a traves del estudio de los manuales. En esta tesis se pretende analizar los manuales de quimica en Espana desde 1788 hasta 1845. Para poder llevar a cabo la investigacion ha sido necesario precisar el objeto de estudio (libro de texto de quimica) durante el periodo estudiado (1788-1845) ya que no es adecuado adoptar la imagen actual de una disciplina que sufrio sustanciales cambios durante la epoca estudiada. Esta investigacion se centra en un momento especialmente importante para la quimica y que algunos historiadores han llegado a considerar "revolucionario". Durante estos anos se produjo un cambio importante en las teorias quimicas sobre la combustion y el concepto de elemento, asi como una reforma terminologica que originaron la aparicion de importantes controversias. Ademas, debido a la relacion de la quimica con otras disciplinas como la historia natural o la fisica ha sido necesario restringir el objeto de estudio

  20. Identifying Bright Stars in Crowded Environments Using Velocity Dispersion Measurements, and an Application to the Center of M32

    NASA Astrophysics Data System (ADS)

    Davidge, T. J.; Beck, Tracy L.; McGregor, Peter J.

    2010-02-01

    Facilities Council (UK), the National Research Council of Canada (Canada), CONICYT (Chile), the Australian Research Council (Australia), the Ministerio da Ciencia e Technologia (Brazil), and the Ministerio de Ciencia, Tecnologia e Innovacion Productiva (Argentina).

  1. Fronts and Thermohaline Structure of the Brazil Current Confluence System

    NASA Astrophysics Data System (ADS)

    Severov, Dimitri

    and Thermohaline Structure of the Brazil Current Confluence System (BCCS) are stud-ied from climatic data, "Marathon Exp. Leg.8, 1984"data, and two Sea surface temperature (SST) data bases: "Meteor satellite"(1989-1994) and "ds277-Reynolds" (1981-2000).The South Atlantic Central Water (SACW) is divided in two main types: tropical (TW) and subtropical water (ST). Water masses, fronts, inter-frontal and frontal zones are analysed and classified: a) the water masses: Tropical Low-Salinity Water, Tropical Surface Water, Tropical Tropospheric Water, Subtropical Low-Salinity Water, Subtropical Surface Water, Subtropical Tropospheric Water. T,S characteristics of intermediate, deep and bottom water defined by different authors are confirmed and completed; b) the Inter-frontal Zones: Tropical/Brazil Current Zone, Sub-tropical Zone and Subantarctic Zone; c) the Frontal Zones: Subtropical, Subantarctic and Polar, and d) the Fronts: Subtropical Front of the Brazil Current, Principal Subtropical Front, North Subtropical Front, Subtropical Surface Front, South Subtropical Front, Subantarctic Surface Front, Subantarctic Front and Polar Front. Several stable T-S relationships are found below the friction layer and at the Fronts. The maximum gradient of the oceanographic characteris-tics occurs at the Brazil Current Front, which can be any of the subtropical fronts, depending on season. Minimum mean depth of the pycnocline coincides with the fronts of the BCCS, indicating the paths of low-salinity shelf waters into the open ocean. D. N. Severov (a) , V. Pshennikov (b) and A.V. Remeslo (c) a -Sección Oceanologé Facultad de Ciencia, Universidad de la Republica, Igué 4225, 11400 ıa, a Montevideo, Uruguay. Tel. (598-2) 525-8618, Fax (598-2) 525-8617, mail: dima@fcien.edu.uy b -Instituto de Física, Facultad de Ciencias, Universidad de la Republica, Igué 4225, 11400 Mon-a tevideo, Uruguay, mail: seva@fisica.edu.uy c -Atlantic Research Inst. For Fisheries Oceanology (Atlant

  2. Physics in the Andean Countries: A Perspective from Condensed Matter, Novel Materials and Nanotechnology

    NASA Astrophysics Data System (ADS)

    Prieto, P.

    2009-05-01

    We will discuss the current state of R&D in the fields of condensed matter, novel materials, and nanotechnology in the Andean nations. We will initially consider Latin America and the Caribbean (LAC) to then visualize individual developments, as well as those for the region as a whole in these fields of knowledge in each of the nations constituting the Andean Region (Bolivia, Ecuador, Chile, Venezuela, Peru, and Colombia). Based on Science & Technology watch exercises in the countries involved, along with the Iberian American and Inter-American Science & Technology Network of Indicators (Red de indicadores de Ciencia y Tecnolog'ia (RICYT) iberoamericana e interamericana)1, we will reveal statistical data that will shed light on the development in the fields mentioned. As will be noted, total R&D investment in Latin American and Caribbean countries remained constant since 1997. In spite of having reached a general increase in publications without international collaboration in LAC nations, the countries with greatest research productivity in Latin America (Argentina, Mexico, Brazil, and Chile) have strengthened their international collaboration with the United States, France, Germany, and Italy through close links associated with the formation processes of their researchers. Academic and research integration is evaluated through joint authorship of scientific articles, evidencing close collaboration in fields of research. This principle has been used in the creation of cooperation networks among participating nations. As far as networks of research on condensed matter, novel materials, and nanotechnology, the Andean nations have not consolidated a regional network allowing permanent and effective cooperation in research and technological development; as would be expected, given their idiomatic and cultural similarities, their historical background, and geographical proximity, which have been integrating factors in other research areas or socio-economic aspects. This

  3. Breakfast of champions or kiss of death? Survival and sexual performance of protein-fed, sterile Mediterranean fruit flies (Diptera: Tephritidae)

    SciTech Connect

    Yuval, B.; Maor, M.; Levy, K.; Kaspi, R.; Taylor, P.; Shelly, T.

    2007-03-15

    dieta sobre los obstaculos sucesivos que los machos tienen que superar para inseminar las hembras, i.e., unir con otros machos en areas para el apareamiento, copula de las hembras, almacenar esperma e inhibir el re-apareamiento de hembras. Ademas discutimos los efectos de la dieta sobre el exito de su actividad forrajera despues de ser liberados, la longevidad y la habilidad para aguantar la inanicion. Mientras que la alimentacion con proteina universalmente aumentan el exito sexual de los machos naturales, su efecto sobre los machos esteriles varia segun la raza, el lugar de los experimentos y las condiciones ambientales. En algunos casos, los tratamientos que resultaron con mejor desempeno sexual fueron asociados significativamente con el aumento de la vulnerabilidad a la inanicion. Sin embargo, ninguna dieta en particular afecto la habilidad de los machos esteriles para encontrar nutrientes en el campo cuando fueron disponibles. Nosotros sugerimos que puede ser mejor el liberar moscas que tienen una vida relativamente corta y que son mas competidoras, en vez de moscas que tienen una vida larga y sexualmente inefectiva. (author)

  4. Contest ``LET your School GO Into - Space Baptism 2007

    NASA Astrophysics Data System (ADS)

    Sánchez, G.

    2009-05-01

    The contest ``Space Baptism 2007'' was organized with the cooperation of the Mirador de la Ciencia, a science museum associated with the local zoo in Barquisimeto, Venezuela, and in collaboration with the Asociación Larense de Astronomía, a local astronomy amateur group. This contest was aimed at students of primary schools and had as a final award the chance to give a proper name to an asteroid. The ultimate goal of the contest was to promote basic and space sciences to children and the young through activities that involved the creation of stories related to astronomy, enforcing creativity and originality, and encouraging group work and solidarity. As a result, the asteroid (12758) 1993 SM3 will be known from now on as (12758) Kabudarí. The success of this initiative is demonstrated by stories about the contest that appeared in several publications in local newspapers and magazines about the school and the students who won the contest. We are currently developing plans for repetitions of the contest to name two more asteroids.

  5. Tedese Project

    NASA Astrophysics Data System (ADS)

    Buforn, E.; Davila, J. Martin; Bock, G.; Pazos, A.; Udias, A.; Hanka, W.

    The TEDESE (Terremotos y Deformacion Cortical en el Sur de España) project is a joint project of the Universidad Complutense de Madrid (UCM) and Real Instituto y Observatorio de la Armada de San Fernando, Cadiz (ROA) supported by the Spanish Ministerio de Ciencia y Tecnologia with the participation of the GeoforschungZen- trum, Potsdam (GFZ). The aim is to carry out a study of the characteristics of the oc- currence and mechanism of earthquakes together with measurements of crustal struc- ture and deformations in order to obtain an integrated evaluation of seismic risk in southern Spain from. As part of this project a temporal network of 10 broad-band seismological stations, which will complete those already existing in the zone, have been installed in southern Spain and northern Africa for one year beginning in October 2001. The objectives of the project are the study in detail of the focal mechanisms of earthquakes in this area, of structural in crust and upper mantle, of seismic anisotropy in crust and mantle as indicator for tectonic deformation processed and the measure- ments of crustal deformations using techniques with permanent GPS and SLR stations and temporary GPS surveys. From these studies, seismotectonic models and maps will be elaborated and seismic risk in the zone will be evaluated.

  6. IGBP: Crown jewel or prodigal son?

    NASA Astrophysics Data System (ADS)

    Roederer, Juan G.

    At its 1986 General Assembly in Bern, Switzerland, the International Council of Scientific Unions (ICSU) launched what promises to be the biggest and most ambitious enterprise of international scientific cooperation (see “ICSU Gives Green Light to IGBP,” Eos, 67, p. 777, 1986). The International Geosphere-Biosphere Program (IGBP), known also as “Global Change,” has as its main objective to describe and understand the interactive physical, chemical and biological processes that regulate the total Earth system, the unique environment that it provides for life, the changes that are occurring in this system, and the manner in which they are influenced by human actions.It should be no wonder, then, that this year's ICSU General Committee Meeting at the Academia das Ciencias de Lisboa (Lisbon, Portugal, October 11-14) was virtually dominated by IGBP matters, even during the discussion of agenda items that did not include this subject explicitly. It is fair to say that the Unions are just becoming fully aware of the real magnitude of the program they themselves helped launch in Bern in 1986—and of how little input and control they have had so far in its development. An indication of this “awakening” was already apparent during the ICSU General Assembly in Beijing in 1988, but the full realization of the enormous impact and ramifications of IGBP inside and outside ICSU is emerging only now.

  7. Discovery of Three Pulsating, Mixed-atmosphere, Extremely Low-mass White Dwarf Precursors

    NASA Astrophysics Data System (ADS)

    Gianninas, A.; Curd, Brandon; Fontaine, G.; Brown, Warren R.; Kilic, Mukremin

    2016-05-01

    We report the discovery of pulsations in three mixed-atmosphere, extremely low-mass white dwarf (ELM WD, M ≤slant 0.3 M ⊙) precursors. Following the recent discoveries of pulsations in both ELM and pre-ELM WDs, we targeted pre-ELM WDs with mixed H/He atmospheres with high-speed photometry. We find significant optical variability in all three observed targets with periods in the range 320-590 s, consistent in timescale with theoretical predictions of p-mode pulsations in mixed-atmosphere ≈0.18 M ⊙ He-core pre-ELM WDs. This represents the first empirical evidence that pulsations in pre-ELM WDs can only occur if a significant amount of He is present in the atmosphere. Future, more extensive, timeseries photometry of the brightest of the three new pulsators offers an excellent opportunity to constrain the thickness of the surface H layer, which regulates the cooling timescales for ELM WDs. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

  8. The influence of electrohydrodynamic flow on the distribution of chemical species in positive corona

    NASA Astrophysics Data System (ADS)

    Pontiga, Francisco; Yanallah, Khelifa; Bouazza, R.; Chen, Junhong

    2015-09-01

    A numerical simulation of positive corona discharge in air, including the effect of electrohydrodynamic (EHD) motion of the gas, has been carried out. Air flow is assumed to be confined between two parallel plates, and corona discharge is produced around a thin wire, midway between the plates. Therefore, fluid dynamics equations, including electrical forces, have been solved together with the continuity equation of each neutral species. The plasma chemical model included 24 chemical reactions and ten neutral species, in addition to electrons and positive ions. The results of the simulation have shown that the influence of EHD flow on the spatial distributions of the species is quite different depending on the species. Hence, reactive species like atomic oxygen and atomic nitrogen are confined to the vicinity of the wire, and they are weakly affected by the EHD gas motion. In contrast, nitrogen oxides and ozone are efficiently dragged outside the active region of the corona discharge by the EHD flow. This work was supported by the Spanish Government Agency ``Ministerio de Ciencia e Innovación'' under Contract No. FIS2011-25161.

  9. Magnon drag thermopile

    NASA Astrophysics Data System (ADS)

    Valenzuela, Sergio O.

    2013-03-01

    Thermoelectric effects in spintronics are gathering increasing attention as a means of controlling spin information by using heat flow. Thermal magnons (spin-wave quanta) are expected to play a major role, however, the coupling between electrons and magnons in ferromagnetic metals remains poorly understood. We demonstrate a conceptually new device that enables us to gather information on magnon-electron scattering and magnon-drag effects. The device resembles a thermopile formed by a large number of pairs of ferromagnetic wires placed between a hot and a cold source and connected thermally in parallel and electrically in series. By controlling the relative orientation of the magnetization in pairs of wires, the magnon drag can be studied independently of the electron and phonon drag thermoelectric effects. Measurements as a function of temperature reveal the effect on magnon drag following a variation of magnon and phonon populations. These results demonstrate the feasibility of directly converting magnon dynamics of nanomagnets into an electrical signal and could pave the way to novel thermoelectric devices for energy harvesting. This research was supported by the Spanish Ministerio de Ciencia e Innovación, MICINN (MAT2010-18065) and by the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement NANOFUNCTION no 257375.

  10. What can we learn from the dynamics of entanglement and quantum discord in the Tavis-Cummings model?

    NASA Astrophysics Data System (ADS)

    Restrepo, Juliana; Rodriguez, Boris A.

    We revisit the problem of the dynamics of quantum correlations in the exact Tavis-Cummings model. We show that many of the dynamical features of quantum discord attributed to dissipation are already present in the exact framework and are due to the well known non-linearities in the model and to the choice of initial conditions. Through a comprehensive analysis, supported by explicit analytical calculations, we find that the dynamics of entanglement and quantum discord are far from being trivial or intuitive. In this context, we find states that are indistinguishable from the point of view of entanglement and distinguishable from the point of view of quantum discord, states where the two quantifiers give opposite information and states where they give roughly the same information about correlations at a certain time. Depending on the initial conditions, this model exhibits a fascinating range of phenomena that can be used for experimental purposes such as: Robust states against change of manifold or dissipation, tunable entanglement states and states with a counterintuitive sudden birth as the number of photons increase. We furthermore propose an experiment called quantum discord gates where discord is zero or non-zero depending on the number of photons. This work was supported by the Vicerrectoria de Investigacion of the Universidad Antonio Narino, Colombia under Project Number 20141031 and by the Departamento Administrativo de Ciencia, Tecnologia e Innovacion (COLCIENCIAS) of Colombia under Grant Number.

  11. Origin of Dynamical Quantum Non-locality

    NASA Astrophysics Data System (ADS)

    Pachon, Cesar E.; Pachon, Leonardo A.

    2014-03-01

    Non-locality is one of the hallmarks of quantum mechanics and is responsible for paradigmatic features such as entanglement and the Aharonov-Bohm effect. Non-locality comes in two ``flavours'': a kinematic non-locality- arising from the structure of the Hilbert space- and a dynamical non-locality- arising from the quantum equations of motion-. Kinematic non-locality is unable to induce any change in the probability distributions, so that the ``action-at-a-distance'' cannot manifest. Conversely, dynamical non-locality does create explicit changes in probability, though in a ``causality-preserving'' manner. The origin of non-locality of quantum measurements and its relations to the fundamental postulates of quantum mechanics, such as the uncertainty principle, have been only recently elucidated. Here we trace the origin of dynamical non-locality to the superposition principle. This relation allows us to establish and identify how the uncertainty and the superposition principles determine the non-local character of the outcome of a quantum measurement. Being based on group theoretical and path integral formulations, our formulation admits immediate generalizations and extensions to to, e.g., quantum field theory. This work was supported by the Departamento Administrativo de Ciencia, Tecnologia e Innovacion -COLCIENCIAS- of Colombia under the grant number 111556934912.

  12. Critical quasienergy states in driven many-body systems

    NASA Astrophysics Data System (ADS)

    Bastidas Valencia, Victor Manuel; Engelhardt, Georg; Perez-Fernandez, Pedro; Vogl, Malte; Brandes, Tobias

    2015-03-01

    A quantum phase transition (QPT) is characterized by non-analyticities of ground-state properties at the critical points. Recently it has been shown that quantum criticality emerges also in excited states of the system, which is referred to as an excited-state quantum phase transition (ESQPT). This kind of quantum criticality is intimately related to a level clustering at critical energies, which results in a logarithmic singularity in the density of states. Most of the previous studies on quantum criticality in excited states have been focused on time independent systems. Here we study spectral singularities that appear in periodically-driven many-body systems and show how the external control allows one to engineer geometrical features of the quasienergy landscape. In particular, we study singularities in the quasienergy spectrum of a fully-connected network consisting of two-level systems with time-dependent interactions. We discuss the characteristic signatures of these singularities in observables like the magnetization, which should be measurable with current technology. The authors gratefully acknowledge financial support by the DFG via grants BRA 1528/7, BRA 1528/8, SFB 910 (V.M.B., T.B.), the Spanish Ministerio de Ciencia e Innovacion (Grants No. FIS2011-28738-C02-01) and Junta de Andalucia (Grants No. FQM160).

  13. Influence of voxel size settings in X-Ray CT Imagery of soil in scaling properties

    NASA Astrophysics Data System (ADS)

    Heck, R.; Scaiff, N. T.; Andina, D.; Tarquis, A. M.

    2012-04-01

    Fundamental to the interpretation and comparison of X-ray CT imagery of soil is recognition of the objectivity and consistency of procedures used to generate the 3D models. Notably, there has been a lack of consistency in the size of voxels used for diverse interpretations of soils features and processes; in part, this is due to the ongoing evolution of instrumentation and computerized image processing capacity. Moreover, there is still need for discussion on whether standard voxels sizes should be recommended, and what those would be. Regardless of any eventual adoption of such standards, there is a need to also consider the manner in which voxel size is set in the 3D imagery. In the typical approaches to X-ray CT imaging, voxel size may be set at three stages: image acquisition (involving the position of the sample relative to the tube and detector), image reconstruction (where binning of pixels in the acquired images may occur), as well as post-reconstruction re-sampling (which may involve algorithms such as tri-cubic convolution). This research evaluates and compares the spatial distribution of intra-aggregate voids in 3D imagery as well as their scaling properties, of equivalent voxel size, generated using various combinations of the afore-mentioned approaches. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

  14. Speckle Camera Imaging of the Planet Pluto

    NASA Astrophysics Data System (ADS)

    Howell, Steve B.; Horch, Elliott P.; Everett, Mark E.; Ciardi, David R.

    2012-10-01

    We have obtained optical wavelength (692 nm and 880 nm) speckle imaging of the planet Pluto and its largest moon Charon. Using our DSSI speckle camera attached to the Gemini North 8 m telescope, we collected high resolution imaging with an angular resolution of ~20 mas, a value at the Gemini-N telescope diffraction limit. We have produced for this binary system the first speckle reconstructed images, from which we can measure not only the orbital separation and position angle for Charon, but also the diameters of the two bodies. Our measurements of these parameters agree, within the uncertainties, with the current best values for Pluto and Charon. The Gemini-N speckle observations of Pluto are presented to illustrate the capabilities of our instrument and the robust production of high accuracy, high spatial resolution reconstructed images. We hope our results will suggest additional applications of high resolution speckle imaging for other objects within our solar system and beyond. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

  15. The Seebeck Coefficient in Oxygen Enriched La2NiO4

    NASA Astrophysics Data System (ADS)

    Bach, Paul; Leboran, Victor; Rivadulla, Francisco

    2013-03-01

    Oxide-based devices show promise for themoelectric applications due to their chemical stability and straightforward fabrication. The La2NiO4+δ system has been predicted to show an increased thermopower coupled with an increased electrical conductivity around δ = 0 . 05 [Pardo et al. PRB 86, 165114 (2012)] that could lead to a large thermoelectric figure of merit (ZT). We investigate the suitability of lanthanum nickelate as a candidate material for high-ZT devices through a systematic study of oxygenated thin films grown by pulsed laser deposition. We report the electrical conductivity, Seebeck coefficient, and structural morphology of La2NiO4 grown in a range of oxidizing atmospheres and discuss their implications for controlled engineering of thermoelectric properties. We have explored the possibility of gate-tuning these systems in order to fabricate single-oxide based devices. This work was supported by the Ministerio de Ciencia e Innovación (Spain), grant MAT2010-16157, and the European Research Council, grant ERC-2010-StG 259082 2D THERMS.

  16. Easier Phase IIs: Recent Improvements to the Gemini User Tools

    NASA Astrophysics Data System (ADS)

    Miller, Bryan; Nuñez, A.

    2013-01-01

    During 2011 and 2012 Gemini Observatory undertook a significant project to improve the software tools used by investigators to propose for and prepare observations. The main goal was to make the definition of observation details (the Phase II process) easier and faster. The main initiatives included rewriting the observing proposal tool (Phase I Tool) and making several major improvements to the Observing Tool, including automatic settings for arc and flat exposures, automatic guide star selection for all instruments and wavefront sensors, and more complete initial template observations with capabilities for simultaneous editing of many observations. This poster explains these major changes as well as outlines future development plans. The Gemini Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

  17. Soil surface roughness and porosity under different tillage systems

    NASA Astrophysics Data System (ADS)

    Rodriguez-Gonzalez, J.; Saa-Requejo, A.; Gómez, J. A.; Valencia, J. L.; Zarco, P.; Tarquis, A. M.

    2012-04-01

    Both soil porosity and surface elevation can be altered by tillage operation. Even though the surface porosity is an important parameter of a tilled field, however, no practical technique for rapid and non-contact measurement of surface porosity has been developed yet. On the contrary, the surface elevation of tilled soil can be quickly determined with a laser profiler. Working under the assumption that the surface elevation of a tilled field is a complicated superposition of the soil terrain profile at a larger-scale and the roughness at a fine-scale, this study included three aspects: (i) to establish an index (Roughness Index, RI) at a fine-scale to associate the surface roughness with porosity; (ii) to examine the correlation between surface porosity and the proposed RI by three types of tillage treatment in the field; and (iii) to check the scaling/multiscaling behavior among different grid sizes of calculating RI on predicting surface porosity. Consequently, the statistical results from each tilled plot show a strong correlation between the surface porosity and the defined RI in an early stage (ca. 2 days) after tillage. Acknowledgements Funding provided by CEIGRAM (Research Centre for the Management of Agricultural and Environmental Risks)and Spanish Ministerio de Ciencia e Innovación (MICINN) through project AGL2010-21501/AGR is greatly appreciated.

  18. Discovery of Three Pulsating, Mixed-atmosphere, Extremely Low-mass White Dwarf Precursors

    NASA Astrophysics Data System (ADS)

    Gianninas, A.; Curd, Brandon; Fontaine, G.; Brown, Warren R.; Kilic, Mukremin

    2016-05-01

    We report the discovery of pulsations in three mixed-atmosphere, extremely low-mass white dwarf (ELM WD, M ≤slant 0.3 M ⊙) precursors. Following the recent discoveries of pulsations in both ELM and pre-ELM WDs, we targeted pre-ELM WDs with mixed H/He atmospheres with high-speed photometry. We find significant optical variability in all three observed targets with periods in the range 320–590 s, consistent in timescale with theoretical predictions of p-mode pulsations in mixed-atmosphere ≈0.18 M ⊙ He-core pre-ELM WDs. This represents the first empirical evidence that pulsations in pre-ELM WDs can only occur if a significant amount of He is present in the atmosphere. Future, more extensive, timeseries photometry of the brightest of the three new pulsators offers an excellent opportunity to constrain the thickness of the surface H layer, which regulates the cooling timescales for ELM WDs. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

  19. Experimental study of the lift and drag characteristics of a cascade of flat plates in a configuration of interest for tidal energy converters

    NASA Astrophysics Data System (ADS)

    Fedoul, Faical; Parras, Luis; Del Pino, Carlos; Fernandez-Feria, Ramon

    2012-11-01

    Wind tunnel experiments are conducted for the flow around both a single flat plate and a cascade of three parallel flat plates at different angles of incidence to compare their lift and drag coefficients in a range of Reynolds number about 105, and for two values of the aspect ratio of the flat plates. The selected cascade configuration is of interest for a particular type of tidal energy converter. The lift and drag characteristics of the central plate in the cascade are compared to those of the isolated plate, finding that there exist an angle of incidence, which depends on the Reynolds number and the aspect ratio, above which the effective lift of the plate in the cascade becomes larger than that of an isolated plate. These experimental results, which are also analyzed in the light of theoretical predictions, are used as a guide for the design of the optimum configuration of the cascade which extracts the maximum power from a tidal current for a given value of the Reynolds number. Supported by the Ministerio de Ciencia e Innovacion (Spain) Grant no. ENE2010-16851.

  20. Attosecond Electro-Magnetic Forces Acting on Metal Nanospheres Induced By Relativistic Electrons

    NASA Astrophysics Data System (ADS)

    Lagos, M. J.; Batson, P. E.; Reyes-Coronado, A.; Echenique, P. M.; Aizpurua, J.

    2014-03-01

    Swift electron scattering near nanoscale materials provides information about light-matter behavior, including induced forces. We calculate time-dependent electromagnetic forces acting on 1-1.5 nm metal nanospheres induced by passing swift electrons, finding both impulse-like and oscillatory response forces. Initially, impulse-like forces are generated by a competition between attractive electric forces and repulsive magnetic forces, lasting a few attoseconds (5-10 as). Oscillatory, plasmonic response forces take place later in time, last a few femtoseconds (1- 5 fs), and apparently rely on photon emission by decay of the electron-induced surface plasmons. A comparison of the strength of these two forces suggests that the impulse-like behavior dominates the process, and can transfer significant linear momentum to the sphere. Our results advance understanding of the physics behind the observation of both attractive and repulsive behavior of gold nano-particles induced by electron beams in aberration-corrected electron microscopy. Work supported under DOE, Award # DE-SC0005132, Basque Gov. project ETORTEK inano, Spanish Ministerio de Ciencia e Innovacion, No. FIS2010-19609-C02-01.

  1. Astrometric Calibration of the Gemini NICI Planet-Finding Campaign

    NASA Astrophysics Data System (ADS)

    Hayward, Thomas L.; Biller, Beth A.; Liu, Michael C.; Nielsen, Eric L.; Wahhaj, Zahed; Chun, Mark; Ftaclas, Christ; Hartung, Markus; Toomey, Douglas W.

    2014-12-01

    We describe the astrometric calibration of the Gemini NICI Planet-Finding Campaign. The Campaign requires a relative astrometric accuracy of ≈20 mas across multiyear timescales in order to distinguish true companions from background stars by verifying common proper motion and parallax with their parent stars. The calibration consists of a correction for instrumental optical image distortion, plus on-sky imaging of astrometric fields to determine the pixel scale and image orientation. We achieve an accuracy of lsim7 mas between the center and edge of the 18'' NICI field, meeting the 20 mas requirement. Most of the Campaign data in the Gemini Science Archive are accurate to this level but we identify a number of anomalies and present methods to correct the errors. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc. under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

  2. Modelling Positron Interactions with Matter

    NASA Astrophysics Data System (ADS)

    Garcia, G.; Petrovic, Z.; White, R.; Buckman, S.

    2011-05-01

    In this work we link fundamental measurements of positron interactions with biomolecules, with the development of computer codes for positron transport and track structure calculations. We model positron transport in a medium from a knowledge of the fundamental scattering cross section for the atoms and molecules comprising the medium, combined with a transport analysis based on statistical mechanics and Monte-Carlo techniques. The accurate knowledge of the scattering is most important at low energies, a few tens of electron volts or less. The ultimate goal of this work is to do this in soft condensed matter, with a view to ultimately developing a dosimetry model for Positron Emission Tomography (PET). The high-energy positrons first emitted by a radionuclide in PET may well be described by standard formulas for energy loss of charged particles in matter, but it is incorrect to extrapolate these formulas to low energies. Likewise, using electron cross-sections to model positron transport at these low energies has been shown to be in serious error due to the effects of positronium formation. Work was supported by the Australian Research Council, the Serbian Government, and the Ministerio de Ciencia e Innovación, Spain.

  3. Interface-mediated intervalley coupling in Si

    NASA Astrophysics Data System (ADS)

    Koiller, Belita; Saraiva, A. L.; Calderon, M. J.; Hu, Xuedong; Das Sarma, S.

    2011-03-01

    The conduction band degeneracy in Si is detrimental to spin qubits, for which a nondegenerate ground orbital state is desirable. The Si valley degeneracy is reduced to 2 near an interface with an insulator, and it may be lifted by the spatially abrupt change in the crystal potential. Basic physical mechanisms for Si/barrier mediated valley coupling in different situations are addressed here. Theoretical studies of the interface-induced valley splitting in Si are presented. Abrupt and smooth interface profiles are considered, and the full plane wave expansions of the Bloch functions at the conduction band minima are included. Simple criteria are suggested for optimal fabrication parameters affecting the valley splitting, emphasizing the relevance of different interface-related properties. Refs: A.L.Saraiva et al, PRB 80, 081305 R (2009); arXiv:1006.3338 Support: BK and ALS thank CNPq, FUJB, INCT on Quantum Information, and FAPERJ. M.J.C. acknowledges Ministerio de Ciencia e Innovación (Spain). XH amd SDS thank NSA and L PS. S.D.S. also thanks CMTC.

  4. Soil Surface Roughness through Image Analysis

    NASA Astrophysics Data System (ADS)

    Tarquis, A. M.; Saa-Requejo, A.; Valencia, J. L.; Moratiel, R.; Paz-Gonzalez, A.; Agro-Environmental Modeling

    2011-12-01

    Soil erosion is a complex phenomenon involving the detachment and transport of soil particles, storage and runoff of rainwater, and infiltration. The relative magnitude and importance of these processes depends on several factors being one of them surface micro-topography, usually quantified trough soil surface roughness (SSR). SSR greatly affects surface sealing and runoff generation, yet little information is available about the effect of roughness on the spatial distribution of runoff and on flow concentration. The methods commonly used to measure SSR involve measuring point elevation using a pin roughness meter or laser, both of which are labor intensive and expensive. Lately a simple and inexpensive technique based on percentage of shadow in soil surface image has been developed to determine SSR in the field in order to obtain measurement for wide spread application. One of the first steps in this technique is image de-noising and thresholding to estimate the percentage of black pixels in the studied area. In this work, a series of soil surface images have been analyzed applying several de-noising wavelet analysis and thresholding algorithms to study the variation in percentage of shadows and the shadows size distribution. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010- 21501/AGR and by Xunta de Galicia through project no INCITE08PXIB1621 are greatly appreciated.

  5. Synthetic Seismograms Derived from Oceanographic Data in the Campeche Canyon, Deepwater Gulf of Mexico

    NASA Astrophysics Data System (ADS)

    Gonzalez-Orduno, A.; Fucugauchi, J. U.; Monreal, M.; Perez-Cruz, G.; Salas de León, D. A.

    2013-05-01

    The seismic reflection method has been successfully applied worldwide to investigate subsurface conditions to support important business decisions in the oil industry. When applied in the marine environment, useful reflection information is limited to events on and below the sea floor; Information from the water column, if any, is disregarded. Seismic oceanography is emerging as a new technique that utilize the reflection information within the water column to infer thermal-density contrasts associated with oceanographic processes, such as cyclonic-anticyclonic eddies, ascending-descending water flows, and water flows related to rapid topographic changes on the sea floor. A seismic investigation to infer such oceanographic changes in one sector of the Campeche Canyon is in progress as a research matter at the Instituto de Ciencias del Mar y Limnologia from the University of Mexico (UNAM). First steps of the investigation consisted of creating synthetic seismograms based on oceanographic information (temperature and density) derived from direct observation on a series of close spaced depth points along vertical profiles. Details of the selected algorithms used for the transformation of the oceanographic data to acoustic impedances data sets and further construction of synthetic seismograms on each site and their representation as synthetic seismic sections, are presented in this work, as well as the road ahead in the investigation.

  6. Entanglement transfer from microwaves to diamond NV centers

    NASA Astrophysics Data System (ADS)

    Gomez, Angela V.; Rodriguez, Ferney J.; Quiroga, Luis

    2014-03-01

    Strong candidates to create quantum entangled states in solid-state environments are the nitrogen-vacancy (NV) defect centers in diamond. By the combination of radiation from different wavelength (optical, microwave and radio-frequency), several protocols have been proposed to create entangled states of different NVs. Recently, experimental sources of non-classical microwave radiation have been successfully realized. Here, we consider the entanglement transfer from spatially separated two-mode microwave squeezed (entangled) photons to a pair of NV centers by exploiting the fact that the spin triplet ground state of a NV has a natural splitting with a frequency on the order of GHz (microwave range). We first demonstrate that the transfer process in the simplest case of a single pair of spatially separated NVs is feasible. Moreover, we proceed to extend the previous results to more realistic scenarios where 13C nuclear spin baths surrounding each NV are included, quantifying the degradation of the entanglement transfer by the dephasing/dissipation effects produced by the nuclear baths. Finally, we address the issue of assessing the possibility of entanglement transfer from the squeezed microwave light to two nuclear spins closely linked to different NV center electrons. Facultad de Ciencias Uniandes.

  7. Proximity effect in superconductor/ferromagnet hetero-structures as a function of interface properties

    NASA Astrophysics Data System (ADS)

    Sarmiento, Julio; Patino, Edgar J.

    2014-03-01

    Superconductor/ferromagnet heterostructures are currently a subject of strong research due to novel phenomena resulting from the proximity effect. Among the most investigated ones are the oscillations of the critical temperature as function of the ferromagnet thickness. The oscillatory behavior of Tc is theoretically explained as to be result of the generation of the FFLO (Fulde-Ferrel-Larkin-Ovchinnikov) state of Cooper pairs under the presence of the exchange field of the ferromagnet. With the advancement of experimental techniques for S/F bilayers growth new questions regarding the effect of the interface transparency can to be addressed. For instance the influence of the interface roughness on the proximity effect. For studying this phenomenon Nb/Co and Nb/Cu/Co samples were sputtered on SiO2 substrates with different roughness. Characterization of these samples show a significant variation of Tc with the interface roughness. This results point towards a possible relationship between transparency and roughness of the interface. Proyecto Semilla Facultad de Ciencias Universidad de los Andes.

  8. Vortex Flipping in Superconductor-Ferromagnet Spin Valve Structures

    NASA Astrophysics Data System (ADS)

    Patino, Edgar J.; Aprili, Marco; Blamire, Mark; Maeno, Yoshiteru

    2014-03-01

    We report in plane magnetization measurements on Ni/Nb/Ni/CoO and Co/Nb/Co/CoO spin valve structures with one of the ferromagnetic layers pinned by an antiferromagnetic layer. In samples with Ni, below the superconducting transition Tc, our results show strong evidence of vortex flipping driven by the ferromagnets magnetization. This is a direct consequence of proximity effect that leads to vortex supercurrents leakage into the ferromagnets. Here the polarized electron spins are subject to vortices magnetic field occasioning vortex flipping. Such novel mechanism has been made possible for the first time by fabrication of the F/S/F/AF multilayered spin valves with a thin-enough S layer to barely confine vortices inside as well as thin-enough F layers to align and control the magnetization within the plane. When Co is used there is no observation of vortex flipping effect. This is attributed to Co shorter coherence length. Interestingly instead a reduction in pinning field of about 400 Oe is observed when the Nb layer is in superconducting state. This effect cannot be explained in terms of vortex fields. In view of these facts any explanation must be directly related to proximity effect and thus a remarkable phenomenon that deserves further investigation. Programa Nacional de Ciencias Basicas COLCIENCIAS (No. 120452128168).

  9. Porphyrin-based polymeric nanostructures for light harvesting applications: Ab initio calculations

    NASA Astrophysics Data System (ADS)

    Orellana, Walter

    The capture and conversion of solar energy into electricity is one of the most important challenges to the sustainable development of mankind. Among the large variety of materials available for this purpose, porphyrins concentrate great attention due to their well-known absorption properties in the visible range. However, extended materials like polymers with similar absorption properties are highly desirable. In this work, we investigate the stability, electronic and optical properties of polymeric nanostructures based on free-base porphyrins and phthalocyanines (H2P, H2Pc), within the framework of the time-dependent density functional perturbation theory. The aim of this work is the stability, electronic, and optical characterization of polymeric sheets and nanotubes obtained from H2P and H2Pc monomers. Our results show that H2P and H2Pc sheets exhibit absorption bands between 350 and 400 nm, slightly different that the isolated molecules. However, the H2P and H2Pc nanotubes exhibit a wide absorption in the visible and near-UV range, with larger peaks at 600 and 700 nm, respectively, suggesting good characteristic for light harvesting. The stability and absorption properties of similar structures obtained from ZnP and ZnPc molecules is also discussed. Departamento de Ciencias Físicas, República 220, 037-0134 Santiago, Chile.

  10. The role of Hund's coupling in the correlations and the nematicity of iron superconductors

    NASA Astrophysics Data System (ADS)

    Bascones, Elena

    Since their discovery in 2008 the strength and the nature of correlations in iron superconductors have been widely discussed. Understanding the correlations is key to unveil the nature of the superconducting, nematic and magnetic instabilities which appear in the phase diagram. Due to their multi-orbital character, correlations in iron superconductors are strongly affected by Hund's coupling and these materials have been classified by some authors as Hund metals. For a long time there has been a strong controversy on the nature of correlations induced by Hund's coupling and its relation to Mott physics. While some authors describe Hund metals as strongly correlated systems which are not in proximity to a Mott insulating state, others, have described iron superconductors as doped Mott insulators. In the talk, after some introduction, I will first show our recent results which show that while the spin polarization of the atoms, promoted by Hund's coupling induces strong correlations, this does not necessary mean that the total charge is more localized. On the contrary, in some cases this polarization promotes itinerancy. I will then present a generic framework to address the correlations in iron superconductors and discuss the role of Hund's coupling in the nematicity of iron superconductors, with special emphasis on FeSe. Funding from Ministerio de Ciencia y Tecnología FIS2011-29689, FIS2014-53219-P and Fundacion Ramon Areces.

  11. Snow avalanche speed determination using wireless accelerometers at the Weissfluhjoch Snow Chute

    NASA Astrophysics Data System (ADS)

    Vilajosana, I.; Schaefer, M.; Llosa, J.; Suriñach, E.; Marquès, J. M.; Kern, M. A.; Khazaradze, G.

    2009-04-01

    Experiments using a network of wireless accelerometers were carried out at the snow chute operated by the SLF at Weissfluhjoch (Switzerland) with an attempt to study internal dynamics of flowing snow. Several 2D and 3D wireless accelerometers placed in the starting zone prior to the experiments travelled within the flow when the avalanche was released. The characteristics of the sensors (size and density) allow the units to evolve like active particle tracers. Acceleration readings obtained at 85 Hz in 3 different experiments were analysed. The analysis methods used include Empirical Mode Decomposition and Kalman Filtering techniques to obtain reliable speed and position measurements from the single 2D and 3D acceleration measurements. The results are in agreement with those obtained from independent speed measurements from optical sensors and Video Images. The results although preliminary are promising. The information extracted could provide valuable information related to the internal dynamics of the avalanche. Small scale chutes are the ideal scenario for this type of experiment and new experiments using improved sensors are envisaged. Moreover, the potential of wireless technologies and wireless sensors to study natural phenomena such snow avalanches has been demonstrated. JAVA SUN Spot Project and The Spanish Ministerio de Educación y Ciencia Projects: CGL2006-06596/BTE and HU-2007-11 supported this research.

  12. Effect of the electric field on buckled and puckered arsenene

    NASA Astrophysics Data System (ADS)

    Chavez, Victor Hugo; Fernandez-Escamilla, Hector Noe; Martínez-Guerra, Edgar

    With the emergence of new 2D materials, more recently phosphorene, arsenene appears as a new candidate to be explored for electronic devices. We have studied the stability of arsenene pristine and the effect of a transversal electric field on its electronic properties. The calculations were performed using the SIESTA code, with the GGA exchange-correlation functional in the PBE form. We have used numerical atomic orbitals as the basis set for the valence wavefunctions employing a double ζ-polarized basis. We use the Perdew-Becke pseudopotential for an As atom that includes the scalar-relativistic effect and Troullier-Martins parametrization. We adopt the Monkhorst-Pack scheme for k-point sampling of Brillouin zone integrations with 25 ×25 ×1 and 25 ×25 ×1 for the buckled/planar and puckered systems, respectively. We found that buckled and puckered arsenenes are stable and posses indirect gap. The effect of the electric field on the electronic structure of the buckled arsenene is the modulation of indirect to direct gap, while in puckered arsenene the gap linearly decreases as electric field is increased. This research was supported by Consejo Nacional de Ciencia y Tecnología (Conacyt) under Grant No. 43830-F.

  13. Topological Photonics for Continuous Media

    NASA Astrophysics Data System (ADS)

    Silveirinha, Mario

    Photonic crystals have revolutionized light-based technologies during the last three decades. Notably, it was recently discovered that the light propagation in photonic crystals may depend on some topological characteristics determined by the manner how the light states are mutually entangled. The usual topological classification of photonic crystals explores the fact that these structures are periodic. The periodicity is essential to ensure that the underlying wave vector space is a closed surface with no boundary. In this talk, we prove that it is possible calculate Chern invariants for a wide class of continuous bianisotropic electromagnetic media with no intrinsic periodicity. The nontrivial topology of the relevant continuous materials is linked with the emergence of edge states. Moreover, we will demonstrate that continuous photonic media with the time-reversal symmetry can be topologically characterized by a Z2 integer. This novel classification extends for the first time the theory of electronic topological insulators to a wide range of photonic platforms, and is expected to have an impact in the design of novel photonic systems that enable a topologically protected transport of optical energy. This work is supported in part by Fundacao para a Ciencia e a Tecnologia Grant Number PTDC/EEI-TEL/4543/2014.

  14. Stochastic coalescence in finite systems: an algorithm for the numerical solution of the multivariate master equation.

    NASA Astrophysics Data System (ADS)

    Alfonso, Lester; Zamora, Jose; Cruz, Pedro

    2015-04-01

    The stochastic approach to coagulation considers the coalescence process going in a system of a finite number of particles enclosed in a finite volume. Within this approach, the full description of the system can be obtained from the solution of the multivariate master equation, which models the evolution of the probability distribution of the state vector for the number of particles of a given mass. Unfortunately, due to its complexity, only limited results were obtained for certain type of kernels and monodisperse initial conditions. In this work, a novel numerical algorithm for the solution of the multivariate master equation for stochastic coalescence that works for any type of kernels and initial conditions is introduced. The performance of the method was checked by comparing the numerically calculated particle mass spectrum with analytical solutions obtained for the constant and sum kernels, with an excellent correspondence between the analytical and numerical solutions. In order to increase the speedup of the algorithm, software parallelization techniques with OpenMP standard were used, along with an implementation in order to take advantage of new accelerator technologies. Simulations results show an important speedup of the parallelized algorithms. This study was funded by a grant from Consejo Nacional de Ciencia y Tecnologia de Mexico SEP-CONACYT CB-131879. The authors also thanks LUFAC® Computacion SA de CV for CPU time and all the support provided.

  15. Neutral Einstein metrics in four dimensions

    NASA Astrophysics Data System (ADS)

    Law, Peter R.

    1991-11-01

    In Matsushita [J. Math. Phys. 22, 979-982 (1981), ibid. 24, 36-40 (1983)], for curvature endomorphisms for the pseudo-Euclidean space R2,2, an analog of the Petrov classification as a basis for applications to neutral Einstein metrics on compact, orientable, four-dimensional manifolds is provided. This paper points out flaws in Matsushita's classification and, moreover, that an error in Chern's [``Pseudo-Riemannian geometry and the Gauss-Bonnet formula,'' Acad. Brasileira Ciencias 35, 17-26 (1963) and Shiing-Shen Chern: Selected Papers (Springer-Verlag, New York, 1978)] Gauss-Bonnet formula for pseudo-Riemannian geometry was incorporated in Matsushita's subsequent analysis. A self-contained account of the subject of the title is presented to correct these errors, including a discussion of the validity of an appropriate analog of the Thorpe-Hitchin inequality of the Riemannian case. When the inequality obtains in the neutral case, the Euler characteristic is nonpositive, in contradistinction to Matsushita's deductions.

  16. Collisional Evolution Of The Populations Of Trans-Neptunian Objects

    NASA Astrophysics Data System (ADS)

    Campo Bagatin, Adriano; Benavidez, P. G.

    2006-09-01

    The Trans-Neptunian region is yet another example of a collisional system of small bodies in the Solar System. In the last decade the number of TNOs with reliable orbital elements is steadily increasing and we can begin to try and compare collisional evolution models to observed populations. We are developing a model that takes into account the known physics of the fragmentation of icy/rocky bodies, and that considers the different orbital characteristics of the Trans-Neptunian regions ("plutinos" or resonant objects, classical belt and scattered disk) and their mutual interactions. In the last few years it has been proposed that the outer planets, and in particular Neptune, have undergone a migration to their present location and that the TNO region may have experienced a similiar process. With this purpose we also mimick this migration and compare the corresponding outcomes with other possible scenarios. What was the primordial distribution in this region? Is the collisional cascade efficient enough to justify the loss of mass occurred in this region? Is the Trans-Neptunian belt collisionally relaxed? How did Neptune's migration affect the distribution of TNOs? These are some of the key questions regarding TNOs and the evolution of the outer Solar System that we try to help answering with this work. With aknowledgements to the spanish Ministerio de Educacion y Ciencia for financial support.

  17. Energetic Particles Events inside Magnetic Clouds

    NASA Astrophysics Data System (ADS)

    Medina, Jose; Hidalgo, Miguel Angel; Blanco, Juan Jose; Rodriguez-Pacheco, Javier

    The effect of the magnetic topology of the Magnetic Clouds (MCs) over the energetic particle event (EPe) fluxes (0.5-100 MeV) have been simulated. In the data corresponding to the ion and electron fluxes, a depression after a strong maximum is observed when a EPe passes through a MC. Using our cross-section circular and elliptical MC models (Journal of Geophysical Research 107(1), doi:10.1029/2001JA900100 (2002) and Solar Physics 207(1), 187-198 (2002)) we have tried to explain that effect, understanding the importance of the topology of the MC. In sight of the results of the preliminary analysis we conclude that the magnitude of the magnetic field seems not to play a significant role but the helicoidal topology associated with topology of the MCs. This work has been supported by the Spanish Comisín Internacional de o Ciencia y Tecnoloǵ (CICYT), grant ESP2005-07290-C02-01 and ESP2006-08459. This work ıa is performed inside COST Action 724.

  18. Strain-Induced Pseudo--Magnetic Fields in Graphene: MegaGauss in Nanobubbles

    NASA Astrophysics Data System (ADS)

    Levy, Niv

    2011-03-01

    Recent theoretical proposals suggest that strain can be used to modify graphene electronic states through the creation of a pseudo--magnetic field. This effect is unique to graphene because of its massless Dirac fermion-like band structure and particular lattice symmetry (C3v). Scanning tunneling microscopy shows that graphene grown on a platinum (111) surface forms nanobubbles, which are highly strained due to thermal expansion mismatch between the film and the substrate. We find that scanning tunneling spectroscopy measurements of these nanobubbles exhibit Landau levels that form in the presence of strain-induced pseudo--magnetic fields greater than 300 Tesla. This demonstration of enormous pseudo--magnetic fields opens the door to both the study of charge carriers in previously inaccessible high magnetic field regimes and deliberate mechanical control over electronic structure in graphene or so-called ``strain engineering''. In collaboration with S. A. Burke ,2 , K. L. Meaker 2 , M. Panlasigui 2 , A. Zettl 2,3 , F. Guinea 4 , A. H. Castro Neto 5 and M. F. Crommie 2,3 . 1. Present address: Department of Physics and Astronomy and Department of Chemistry, University of British Columbia, Vancouver, BC V6T 121, Canada. 2. Department of Physics, University of California, Berkeley, CA 94720, USA. 3. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. 4. Instituto de Ciencia de Materiales de Madrid (CSIC), Madrid 28049, Spain. 5. Department of Physics, Boston University, Boston, MA 02215, USA.

  19. Effect of cadmium on cellular viability in two species of microalgae (Scenedesmus sp. and Dunaliella viridis).

    PubMed

    Marcano, Letty Beatriz C; Carruyo, Ingrid M; Montiel, Xiomara M; Morales, Carolina B; de Soto, Patricia Moreno

    2009-07-01

    We determined the effect of several concentrations of cadmium (0, 5, 10, and 20 microg/l) on cellular viability in the microalgae Scenedesmus sp. and Dunaliella viridis, by measuring growth at 0, 24, 48, 72, and 96 h and pigment production at 10 days. Algae were obtained from the Nonvascular Plant Laboratory collection, in the Facultad Experimental de Ciencias, Universidad del Zulia, Venezuela. Growth was measured by cellular counting, while pigment content was evaluated using conventional spectrophotometric techniques. Growth of both species decreased in the exposed cultures comparing with the control, but its behavior was similar, because in both control and exposed cultures, its was observed an adaptive phase in the first hours, as well as a growth phase after 72 h. Cadmium concentrations above 10 microg/l produced an adverse effect on pigment production, depending on the concentration and/or exhibition time. However, even though cadmium inhibited growth and pigment production, levels of both parameters indicated cellular viability, demonstrating the adaptability of the algae cultures when they were exposed to the metal. PMID:19172231

  20. Dose Rate Calculations of Spent MTR-HEU Fuel Elements of the IAN-R1 Research Reactor

    NASA Astrophysics Data System (ADS)

    Sarta Fuentes, Jose Antonio

    2005-04-01

    With cooperation of the International Atomic Energy Agency (IAEA) and the Department of Energy (DOE) of the United States, several tasks related to the waste disposal of spent MTR fuel enriched nominally to 93% were carried out for the conversion of the IAN-R1 Research Reactor from MTR-HEU fuel to TRIGA-LEU fuel. In order to remove the spent MTR-HEU fuel of the core and store it safetly, a program was established at the Instituto de Ciencias Nucleares y Energìas Alternativas (INEA). This program included training, acquisition of hardware and sofware, design and construction of a decay pool, transfer of the spent HEU fuel elements into the decay pool and his final transport to Savanah River in United States. In this paper are presented external dose rates which were calculated for a standard spent MTR-HEU fuel element of the IAN-R1 Research Reactor. The calculations take in consideration the activity due to contributions of fission, activation and actinides products for each relevant radionuclide present in a standard spent MTR-HEU fuel. The datas obtained were the base for the respective dosimetric evaluations in the transfering operations of fuel elements into the decay pool and for shielding calculations in designing of the decay pool.

  1. Radionuclide Compositions and Total Activity of Spent MTR-HEU Fuel Elements of the IAN-R1 Research Reactor

    NASA Astrophysics Data System (ADS)

    Sarta, Josè A.; Castiblanco, Luis A.

    2005-05-01

    With cooperation of the International Atomic Energy Agency (IAEA) and the Department of Energy (DOE) of the United States, several calculations and tasks related to the waste disposal of spent MTR fuel enriched nominally to 93% were carried out for the conversion of the IAN-R1 Research Reactor from MTR-HEU fuel to TRIGA-LEU fuel. In order to remove the spent MTR-HEU fuel of the core and store it safely a program was established at the Instituto de Ciencias Nucleares y Energìas Alternativas (INEA). This program included training, acquisition of hardware and software, design and construction of a decay pool, transfer of the spent HEU fuel elements into the decay pool and his final transport to Savannah River in United States. In this paper are presented data of activities calculated for each relevant radionuclide present in spent MTR-HEU fuel elements of the IAN-R1 Research Reactor and the total activity. The total activity calculated takes in consideration contributions of fission, activation and actinides products. The data obtained were the base for shielding calculations for the decay pool concerning the storage of spent MTR-HEU fuel elements and the respective dosimetric evaluations in the transferring operations of fuel elements into the decay pool.

  2. [Educational practices for diabetes mellitus: integrative literature review].

    PubMed

    Borba, Anna Karla de Oliveira Tito; Marques, Ana Paula de Oliveira; Leal, Márcia Carréra Campos; Ramos, Roberta Souza Pereira da Silva

    2012-03-01

    This is an integrative literature review which aims to identify the multi-professional scientific production on educational practices for individuals with diabetes available in the databases: Latin American Literature in Health Sciences (Literatura Latino Americana em Ciências da Saúde-LILACS), Medical Literature and Retrieval System online (Medline), Spanish Bibliographical Index in Health Sciences (Indice Bibliográfico Español en Ciencias de la Salud-Ibecs) and the Database on Nursing (Base de Dados em Enfermagem-BDENF), from 1999 to 2009. Results show that educational practices are developed mainly for adults and seniors up to 80 years of age, and involve themes that reflect the daily ife of living with diabetes. These practices are spread mainly through groups, bringing benefits not only for the individual with diabetes but also for the healthcare professional. Thus, we can see the process of changing the traditional education paradigm to a problem-based dialogical education, with a view for promoting health. PMID:22737810

  3. [Toxic fungi in Buenos Aires City and surroundings].

    PubMed

    Romano, Gonzalo M; Iannone, Leopoldo; Novas, María V; Carmarán, Cecilia; Romero, Andrea I; López, Silvia E; Lechner, Bernardo E

    2013-01-01

    In Facultad de Ciencias Exactas y Naturales,Universidad de Buenos Aires there is a service called Servicio de Identificación de Hongos Tóxicos, directed by researchers of the Program of Medicinal Plants and Fungi Involved in Biological Degradation (PROPLAME-PRHIDEB, CONICET) that assist hospitals and other health establishments, identifying the different samples of fungi and providing information about their toxicity, so that patients can receive the correct treatment. The objective of the present study was to analyze all the cases received from 1985 to 2012. This analysis permitted the confection of a table identifying the most common toxic species. The information gathered revealed that 47% of the patients were under 18 years of age and had eaten basidiomes; the remaining 53% were adults who insisted that they were able to distinguish edible from toxic mushrooms. Chlorophyllum molybdites turned out to be the main cause of fungal intoxication in Buenos Aires, which is commonly confused with Macrolepiota procera, an edible mushroom. In the second place Amanita phalloides was registered, an agaric known to cause severe symptoms after a long period of latency (6-10 hours), and which can lead to hepatic failure even requiring a transplant to prevent severe internal injuries or even death, is not early and correctly treated. PMID:24152394

  4. Confieso que Divulgo. Reflexiones y Experiencias de una Astrofísica

    NASA Astrophysics Data System (ADS)

    Rodríguez Hidalgo, I.

    Este artículo presenta algunas reflexiones en torno a la popularización de la Ciencia, desarrolladas a lo largo de mi trayectoria profesional, un camino inacabado desde la intuición al oficio. Tras revisar las señas de identidad de la divulgación científica, se exponen ideas, experiencias y recursos, cribados por la práctica y su posterior análisis crítico. Se destacan las actividades relacionadas con la Astronomía, que se cuentan entre las más espectaculares y gratificantes. Confessions of a popularizer: This paper presents some author's thoughts about scientific outreach, developed along her professional path, an unfinished way from intuition to trade. First, identity signs of outreach are revised; then, ideas, experiences and resources, sifted by practice and further critical analysis, are reviewed. Activities related to Astronomy, being one of the most spectacular and rewarding, are remarked 1

  5. The lost honour of Henrietta Leavitt

    NASA Astrophysics Data System (ADS)

    Del Puerto, C.

    2011-11-01

    The first scene opens with the music of Shirley Bassey. The astronomer Henrietta Swan Leavitt is writing a diary when visited by the famous CBS reporter Edward Roscoe Murrow. Henrietta is surprised that this American television channel should want to pay such a tribute to her, but she agrees to be interviewed. Annie Jump Cannon, her friend and colleague from Harvard College Observatory, accompanies her during most of the sessions. Everything goes so well that the journalist tries to touch on certain issues that Henrietta seems to want to keep secret, such as her relationship with Edward Charles Pickering, Director of the Observatory, and the reason why she failed to get the recognition for her work that she deserved.This is the argument of the play The Lost Honor of Henrietta Leavitt, a project of the Museo de la Ciencia y el Cosmos (Museum of Science and the Cosmos), run by the Organismo Autonomo de Museos y Centros of Cabildo de Tenerife (Autonomous Organism of Museums and Centres of the island government, Cabildo of Tenerife), with funding from the Spanish Foundation for Science and Technology (FECYT) and designed for the International Year of Astronomy 2009. The play, written and directed by the author, Carmen del Puerto, has been staged eight times in Tenerife and Pamplona. The poster values this experience as a resource for scientific popularization.

  6. "Family planning and population programs" a book review article.

    PubMed

    Hauser, P M

    1967-03-01

    RESUMEN: El volumen Planeamiento Familiar y Programas de Poblacion es un libro indispensable tanto para demógrafos como para otras personas interesadas en el control de población. Tiene sus limitaciones dodo su caracter heterogéneo, su falta de autocrítica, el no tratar sobre la validez y confiabilidad de las encuestas de conocimientos, attitudes y prácticas (KAP), su injustificado tono optimista, y su fracaso al no explorar y considerar alternativas para las presunciones y premisas sobre las cuales se basan los actuates programas de planeamiento familiar. Es sin embargo un importante hito que resume las contribuciones de las ciencias sociales y biomédicas al campo de la demografía.SummaryThe volume Family Planning and Population Programs is an indispensable book to demographers as well as to others concerned with population control. It is not without limitations because of its heterogeneous character, its lack of self-criticism, its failure to deal with the reliability and validity of KAP surveys, its unwarranted optimistic aura, and its failure to explore and consider alternatives to the basic assumptions and premises on which present family planning programs are based. It is, nevertheless, a landmark in its summarization of the contribution of the social and biomedical sciences to demographic engineering. PMID:21279790

  7. Realistic retrospective dose assessments to members of the public around Spanish nuclear facilities.

    PubMed

    Jiménez, M A; Martín-Valdepeñas, J M; García-Talavera, M; Martín-Matarranz, J L; Salas, M R; Serrano, J I; Ramos, L M

    2011-11-01

    In the frame of an epidemiological study carried out in the influence areas around the Spanish nuclear facilities (ISCIII-CSN, 2009. Epidemiological Study of The Possible Effect of Ionizing Radiations Deriving from The Operation of Spanish Nuclear Fuel Cycle Facilities on The Health of The Population Living in Their Vicinity. Final report December 2009. Ministerio de Ciencia e Innovación, Instituto de Salud Carlos III, Consejo de Seguridad Nuclear. Madrid. Available from: http://www.csn.es/images/stories/actualidad_datos/especiales/epidemiologico/epidemiological_study.pdf), annual effective doses to public have been assessed by the Spanish Nuclear Safety Council (CSN) for over 45 years using a retrospective realistic-dose methodology. These values are compared with data from natural radiation exposure. For the affected population, natural radiation effective doses are in average 2300 times higher than effective doses due to the operation of nuclear installations (nuclear power stations and fuel cycle facilities). When considering the impact on the whole Spanish population, effective doses attributable to nuclear facilities represent in average 3.5×10(-5)mSv/y, in contrast to 1.6mSv/y from natural radiation or 1.3mSv/y from medical exposures. PMID:21827963

  8. Radionuclide Compositions and Total Activity of Spent MTR-HEU Fuel Elements of the IAN-R1 Research Reactor

    SciTech Connect

    Sarta, Jose A.; Castiblanco, Luis A

    2005-05-24

    With cooperation of the International Atomic Energy Agency (IAEA) and the Department of Energy (DOE) of the United States, several calculations and tasks related to the waste disposal of spent MTR fuel enriched nominally to 93% were carried out for the conversion of the IAN-R1 Research Reactor from MTR-HEU fuel to TRIGA-LEU fuel. In order to remove the spent MTR-HEU fuel of the core and store it safely a program was established at the Instituto de Ciencias Nucleares y Energias Alternativas (INEA). This program included training, acquisition of hardware and software, design and construction of a decay pool, transfer of the spent HEU fuel elements into the decay pool and his final transport to Savannah River in United States. In this paper are presented data of activities calculated for each relevant radionuclide present in spent MTR-HEU fuel elements of the IAN-R1 Research Reactor and the total activity. The total activity calculated takes in consideration contributions of fission, activation and actinides products. The data obtained were the base for shielding calculations for the decay pool concerning the storage of spent MTR-HEU fuel elements and the respective dosimetric evaluations in the transferring operations of fuel elements into the decay pool.

  9. Origin and history of chondrite regolith, fragmental and impact-melt breccias from Spain

    NASA Technical Reports Server (NTRS)

    Casanova, I.; Keil, K.; Wieler, R.; San Miguel, A.; King, E. A.

    1990-01-01

    Six ordinary chondrite breccias from the Museo Nacional de Ciencias Naturales, Madrid (Spain), are described and classified as follows: the solar gas-rich regolith breccia Oviedo (H5); the premetamorphic fragmental breccias Cabezo de Mayo (type 6, L-LL), and Sevilla (LL4); the fragmental breccias Canellas (H4) and Gerona (H5); and the impact melt breccia, Madrid (L6). It is confirmed that chondrites with typical light-dark structures and petrographic properties typical of regolith breccias may (Oviedo) or may not (Canellas) be solar gas-rich. Cabezo de Mayo and Sevilla show convincing evidence that they were assembled prior to peak metamorphism and were equilibrated during subsequent reheating. Compositions of olivine and low-Ca pyroxene in host chondrite and breccia clasts in Cabezo de Mayo are transitional between groups L and LL. It is suggested, based on mineralogic and oxygen isotopic compositions of host and clasts, that the rock formed on the L parent body by mixing, prior to peak metamorphism. This was followed by partial equilibrium of two different materials: the indigenous L chondrite host and exotic LL melt rock clasts.

  10. On the identity and taxonomic status of the enigmatic mantid Thespoides bolivari Chopard, 1916 (Mantodea: Mantidae, Angelinae).

    PubMed

    Rivera, Julio

    2014-01-01

    Chopard (1916) published a brief paper in which he cited and described a number of praying mantis species from the neotropics. The specimens he studied belonged to the prominent Spanish Entomologist Ignacio Bolívar y Urrutia (1850-1944), whose collection is now housed at the Museo Nacional de Ciencias Naturales in Madrid (MNCN), Spain (Izquierdo et al. 1997). In this publication Chopard described Thespoides bolivari Chopard, 1916 as a new genus and species, based on a single male obtained by French coleopterist René Oberthür in Cauca, Colombia. According to Chopard (1916) the specimen was remarkable for having, among other features, an abdomen that is markedly shorter than the rest of its body-certainly an unusual morphological trait among the Mantodea. Chopard assigned Thespoides to the Miopteryginae (Thespidae), but it was later reassigned (together with Angela Serville, 1839 as the "Angelae group") to the subfamily Schizocephalinae (Mantidae) by Giglio-Tos (1927). Current classifications consider the Angelinae to comprise a distinct subfamily of the Mantidae, with Thespoides and Angela as the only representatives of this subfamily with a Neotropical distribution (e.g. Ehrmann 2002). PMID:24870866

  11. A model for the behaviour of the Solar Energetic Particle Events inside Magnetic Clouds

    NASA Astrophysics Data System (ADS)

    Medina, J.; Hidalgo, M. A.

    2006-12-01

    The modulation effects of the solar ejecta over the solar energetic particle event SEPe fluxes (0,5-100 MeV) provided by solar flares have recently been highlighted. Especially important is the behaviour of these fluxes inside MCs where, in spite of the low magnetic field intensities of these interplanetary structures (about 30 nT), a decrease in the population of the energetic particles is observed. In the present work it is shown a simple theoretical model we have developed to analyse the behaviour of those fluxes inside the magnetic clouds (MCs) using, as a starting point, our previous magnetic field model for MCs. The experimental data from ACE, GOES, SAMPEX, SOHO, Ulysses and WIND satellites are presented, both from MC coincident with SEPe and not coincident. This work has been supported by the Spanish Comisión Internacional de Ciencia y Tecnología (CICYT), grant ESP2005-07290-C02-01 and ESP2006-08459 and Madrid Autonomous Community / University of Alcala grant CAM-UAH 2005/007. This work is performed inside COST Action 724.

  12. Ozone production using dielectric barrier discharge in oxygen and carbon dioxide

    NASA Astrophysics Data System (ADS)

    Pontiga, Francisco; Abidat, Roukia; Moreno, Helena; Agustín, Fernández-Rueda; Rebiaï, Saida

    2015-09-01

    The generation of ozone in oxygen and carbon dioxide using a planar dielectric barrier discharge (DBD) has been experimentally investigated. The DBD reactor was operated at moderate voltages (4.2 to 5.6 kV) and frequencies (50 to 500 Hz) and the gas flow rate was varied in the range 50 to 200 cm3/min. The averaged consumed power (<1 W) was evaluated using a monitor capacitor of known capacitance (1 μF). The effluent gas from the DBD reactor was diverted to a gas cell situated inside the sample compartment of a UV spectrophotometer. Therefore, ozone concentration was determined from the measurement of absorbance using Beer-Lambert law. The results have shown that ozone concentration in oxygen grows very linearly with the input power. In contrast, the production of ozone in carbon dioxide is less regular, which may be due to the deposition of a thin layer over the stainless steel electrode during the application of the electrical discharge. Moreover, the rate of ozone production with the injected energy density was found to be 500 times weaker in carbon dioxide than in pure oxygen. This work was supported by the Spanish Government Agency ``Ministerio de Ciencia e Innovación'' under Contract No. FIS2011-25161.

  13. Intraspecific variation in body size and shape in an andean highland anole species, Anolis ventrimaculatus (Squamata: Dactyloidae).

    PubMed

    Calderón-Espinosa, Martha L; Ortega-León, Angela M; Zamora-Abrego, Joan G

    2013-03-01

    Variation in body characteristics related to lizard locomotion has been poorly studied at the intraspecific level in Anolis species. Local adaptation due to habitat heterogeneity has been reported in some island species. However, studies of mainland species are particularly scarce and suggest different patterns: high variability among highland lizards and poorly differentiated populations in one Amazonian species. We characterized inter population variation of body size and shape in the highland Andean Anolis ventrimaculatus, an endemic species from Western Colombia. A total of 15 morphometric variables were measured in specimens from the reptile collection of the Instituto de Ciencias Naturales, Universidad Nacional, Colombia. The study included individuals from seven different highland localities. We found size and shape sexual dimorphism, both of which varied among localities. Patterns of variation in body proportions among populations were different in both males and females, suggesting that either sexual or natural selective factors are different in each locality and between sexes. Since this species exhibits a fragmented distribution in highlands, genetic divergence may also be a causal factor of the observed variation. Ecological, behavioral, additional morphological as well as phylogenetic data, may help to understand the evolutionary processes behind the geographic patterns found in this species. PMID:23894978

  14. Transient laminar opposing mixed convection in a symmetrically heated duct with a plane symmetric sudden contraction-expansion: Buoyancy an inclination effects

    NASA Astrophysics Data System (ADS)

    Martínez-Suástegui, Lorenzo; Barreto, Enrique; Treviño, César

    2015-11-01

    Transient laminar opposing mixed convection is studied experimentally in an open vertical rectangular channel with two discrete protruded heat sources subjected to uniform heat flux simulating electronic components. Experiments are performed for a Reynolds number of Re = 700, Prandtl number of Pr = 7, inclination angles with respect to the horizontal of γ =0o , 45o and 90o, and different values of buoyancy strength or modified Richardson number, Ri* =Gr* /Re2 . From the experimental measurements, the space averaged surface temperatures, overall Nusselt number of each simulated electronic chip, phase-space plots of the self-oscillatory system, characteristic times of temperature oscillations and spectral distribution of the fluctuating energy have been obtained. Results show that when a threshold in the buoyancy parameter is reached, strong three-dimensional secondary flow oscillations develop in the axial and spanwise directions. This research was supported by the Consejo Nacional de Ciencia y Tecnología (CONACYT), Grant number 167474 and by the Secretaría de Investigación y Posgrado del IPN, Grant number SIP 20141309.

  15. Non-isothermal electro-osmotic flow in a microchannel with charge-modulated surfaces

    NASA Astrophysics Data System (ADS)

    Bautista, Oscar; Sanchez, Salvador; Mendez, Federico

    2015-11-01

    In this work, we present an theoretical analysis of a nonisothermal electro-osmotic flow of a Newtonian fluid over charge-modulated surfaces in a microchannel. Here, the heating in the microchannel is due to the Joule effect caused by the imposition of an external electric field. The study is conducted through the use of perturbation techniques and is validated by means of numerical simulations. We consider that both, viscosity and electrical conductivity of the fluid are temperature-dependent; therefore, in order to determine the heat transfer process and the corresponding effects on the flow field, the governing equations of continuity, momentum, energy and electric potential have to be solved in a coupled manner. The principal obtained results evidence that the flow patterns are perturbed in a noticeable manner in comparison with the isothernal case. Our results may be used for increasing microfluidics mixing by conjugating thermal effects with the use of charge-modulated surfaces. This work has been supported by the research grants no. 220900 of Consejo Nacional de Ciencia y Tecnología (CONACYT) and 20150919 of SIP-IPN at Mexico. F. Méndez acknowledges also the economical support of PAPIIT-UNAM under contract number IN112215.

  16. Velocity profile of water vapor inside a cavity with two axial inlets and two outlets

    NASA Astrophysics Data System (ADS)

    Guadarrama-Cetina, José; Ruiz Chavarría, Gerardo

    2014-03-01

    To study the dynamics of Breath Figure phenomenon, a control of both the rate of flow and temperature of water vapor is required. The experimental setup widely used is a non hermetically closed chamber with cylindrical geometry and axial inlets and outlets. In this work we present measurements in a cylindrical chamber with diameter 10 cm and 1.5 cm height, keeping a constant temperature (10 °C). We are focused in the velocity field when a gradient of the temperatures is produced between the base plate and the vapor. With a flux of water vapor of 250 mil/min at room temperature (21 °C), the Reynolds number measured in one inlet is 755. Otherwise, the temperatures of water vapor varies from 21 to 40 °C. The velocity profile is obtained by hot wire anemometry. We identify the stagnations and the possibly instabilities regions for an empty plate and with a well defined shape obstacle as a fashion sample. Facultad de Ciencias, UNAM.

  17. Astronomía en la cultura

    NASA Astrophysics Data System (ADS)

    López, A.; Giménez Benitez, S.; Fernández, L.

    La Astronomía en la Cultura es el estudio interdisciplinario a nivel global de la astronomía prehistórica, antigua y tradicional, en el marco de su contexto cultural. Esta disciplina abarca cualquier tipo de estudios o líneas de investigación en que se relacione a la astronomía con las ciencias humanas o sociales. En ella se incluyen tanto fuentes escritas, relatos orales como fuentes arqueológicas, abarcando entre otros, los siguientes temas: calendarios, observación práctica, cultos y mitos, representación simbólica de eventos, conceptos y objetos astronómicos, orientación astronómica de tumbas, templos, santuarios y centros urbanos, cosmología tradicional y la aplicación ceremonial de tradiciones astronómicas, la propia historia de la astronomía y la etnoastronomía (Krupp, 1989) (Iwaniszewski, 1994). En nuestro trabajo abordamos la historia y situación actual de esta disciplina, sus métodos y sus relaciones con otras áreas de investigación.

  18. Relationship between the Fluorescence Lifetime of Chlorophyll 'a' and Primary Productivity within the Mississippi River Plume and Adjacent Shelf Region

    NASA Technical Reports Server (NTRS)

    Hall, Callie; Miller, Richard L.; Fernandez, Salvador M.; McKee, Brent A.

    2000-01-01

    In situ measurements of chlorophyll fluorescence intensity have been widely used to estimate phytoplankton biomass. However, because the fluorescence quantum yield of chlorophyll a in vivo can be highly variable, measurements of chlorophyll fluorescence intensity cannot be directly correlated with phytoplankton biomass and do not provide information on the physiological state of the phytoplankton under study. Conversely, lifetime-based measurements of chlorophyll fluorescence provide a framework in which photosynthetic rates of phytoplankton can be analyzed according to phytoplankton physiology. Along with the measurement of primary production and ambient nutrient concentrations within the Mississippi River plume in the northern Gulf of Mexico, phytoplankton fluorescence lifetimes were measured using a Fluorescence Lifetime Phytoplankton Analyzer (developed under a NASA Small Business Innovative Research contract to Ciencia, Inc.). Variability of fluorescence lifetimes within the plume can be used as a background from which to interpret variations in the maximum quantum yield of photochemistry. The extent to which nutrient and effluent loading in this dynamic coastal area affect the photosynthetic performance of phytoplankton will be presented as a function of phytoplankton fluorescence lifetimes.

  19. ArctiQuest: A Case Study in Sustainability for Education & Public Outreach Projects

    NASA Astrophysics Data System (ADS)

    Shope, R.

    2009-12-01

    ArctiQuest: Enter the Cryosphere, Exploring Ice in the Solar System, is an official International Polar Year (IPY) Education & Public Outreach (EPO) activity for urban youth made possible by support from NASA’s Science Mission Directorate, Earth Science Division. The presenter, Richard Shope, is the Principal Investigator. ArctiQuest leveraged the NASA curriculum authored by Shope, entitled Exploring Ice in the Solar System, to build an international program (U.S. & Mexico) utilizing an urban science enterprise model. The model depends on cultivating relationships with community organizations (governmental, educational, youth employment, as well as non-profit, nongovernmental organizations) to develop creativity and talent within the arena of science and advanced technologies. Through the COUNCIL TO ADVANCE URBAN SCIENCE ENTERPRISE (CAUSE), Shope has established the Urban Science Corps in Los Angeles, Baltimore, New Yok, and Chicago, and La Ciencia A Tu Alcance (Science You Can Reach) in Mexico and Puerto Rico. These projects carry out the NASA ArctiQuest project by providing job slots for undergraduate interships and high school-age apprenticeships as INQUIRY COACHES.

  20. Ab initio study of boron nitride lines on graphene

    NASA Astrophysics Data System (ADS)

    Mata-Carrizal, Berenice; Sanginés-Mendoza, Raúl; Martinez, Edgar

    2013-03-01

    Graphene has unusual electronic properties which make it a promising material for electronic devices. Neverthless, the absence of a band gap sets limitations on its practical applications. Thus, it is crucial to find methods to create and tune the band gap of systems based on graphene. In this way, we explore the modulation of the electronic properties of graphene through doping with boron nitride lines. In particular, we studied the electronic structure of graphene sheets doped with boron nitride lines armchair and zigzag type. The calculations were performed using the pseudopotential LCAO method with a Generalized Gradient Approximation (GGA) for the exchange-correlation energy functional. We found that both doping lines type induce a bandgap and that the energy gap increases as the length of doping lines increases. Accordingly to our DFT calculations, we found that the energy gap on graphene doped with armchair and zigzag lines is due to a two different mechanisms to drain charge from pi- to sigma- orbitals. Thus, we found that doping graphene with boron nitride lines is a useful way to induce and modulate the bandgap on graphene. This research was supported by Consejo Nacional de Ciencia y Tecnología (Conacyt) under Grant No. 133022.

  1. A new reference collection of documented human skeletons from Mérida, Yucatan, Mexico.

    PubMed

    Chi-Keb, J R; Albertos-González, V M; Ortega-Muñoz, A; Tiesler, V G

    2013-10-01

    This report documents the history and composition of a new reference collection currently composed of 84 identified human skeletons from the modern cemetery of Xoclán in Mérida, Yucatan, Mexico. The skeletal sample is the first of its kind in the Yucatan peninsula, a region with a population short of two million mostly local and non-local Mexican residents and descendants of the ancient Maya. The growing collection is curated at the Facultad de Ciencias Antropológicas (School of Anthropological Sciences) of the Autonomous University of Yucatan. Here we describe recovery procedures, preservation, background information and validation measures of the individuals who make up the collection. Detailed information on the generational pattern, sex, and age distribution, along with socioeconomic context and provenance of the skeletons are provided. The majority of the skeletal series is represented by males and by older individuals of both sexes. Almost all of these individuals come from Mérida's middle and lower socioeconomic sectors and died within the urban city boundaries. Biographic information was collected on each individual at the municipal civil registry and confronted with information of national and municipal censuses (2000 and 2005), to be validated and to be discussed here in terms of the representativeness of the reference series and its potential uses in forensic, anthropological and medical research. PMID:23830157

  2. PREFACE: XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC2015)

    NASA Astrophysics Data System (ADS)

    Díaz, C.; Rabadán, I.; García, G.; Méndez, L.; Martín, F.

    2015-09-01

    The 29th International Conference on Photonic, Electronic and Atomic Collisions (XXIX ICPEAC) was held at the Palacio de Congresos ''El Greco'', Toledo, Spain, on 22-28 July, 2015, and was organized by the Universidad Autónoma de Madrid (UAM) and the Consejo Superior de Investigaciones Científicas (CSIC). ICPEAC is held biannually and is one of the most important international conferences on atomic and molecular physics. The topic of the conference covers the recent progresses in photonic, electronic, and atomic collisions with matter. With a history back to 1958, ICPEAC came to Spain in 2015 for the very first time. UAM and CSIC had been preparing the conference for six years, ever since the ICPEAC International General Committee made the decision to hold the XXIX ICPEAC in Toledo. The conference gathered 670 participants from 52 countries and attracted 854 contributed papers for presentation in poster sessions. Among the latter, 754 are presented in issues 2-12 of this volume of the Journal of Physics Conference Series. In addition, five plenary lectures, including the opening one by the Nobel laureate Prof. Ahmed H. Zewail and the lectures by Prof. Maciej Lewenstein, Prof. Paul Scheier, Prof. Philip H. Bucksbaum, and Prof. Stephen J. Buckman, 62 progress reports and 26 special reports were presented following the decision of the ICPEAC International General Committee. Detailed write-ups of most of the latter are presented in issue 1 of this volume, constituting a comprehensive tangible record of the meeting. On the occasion of the International Year of Light (IYL2015) and with the support of the Fundación Española para la Ciencia y la Tecnología (FECYT), the program was completed with two public lectures delivered by the Nobel laureate Prof. Serge Haroche and the Príncipe de Asturias laureate Prof. Pedro M. Echenique on, respectively, ''Fifty years of laser revolutions in physics'rquot; and ''The sublime usefulness of useless science''. Also a

  3. They teach it more successfully

    NASA Astrophysics Data System (ADS)

    Reyes Ruiz-Gallardo, Jose; Valdés, Arturo; Castaño, Santiago

    2010-05-01

    peers (Johnson et al, 1981, Cuseo, 1996, Shachar and Fischer, 2004). It is also related with the increasing of self-esteem (Lawrence, 1996), achieved in environments rich in challenges and low in threat (Abbot and Moylett, 1999). References: Abbot, L. and Moylet, H, 1999. Early education transformed. London: Falmer press. Pp: 214. Bernal, J. M., García-Estañ, R. y Guzman, D. (2005). Las actividades de enseñanza en la Educación Primaria. En: Didáctica de las Ciencias Experimentales I. Sánchez, G. (Coord.). Pp.: 211-322. CUSE (Committee on Undergraduate Science Education), (1997). Science Teaching Reconsidered. A handbook. Washington D. C.: National Academy Press. Cuseo, JB, 1996. Cooperative Learning: A Pedagogy for Addressing Contemporary Challanges & Critical Issues in Higher Education. Marymount college, New Forums Press. Johnson, D., Maruyama, G., Johnson, R., Nelson, C., & Skon, L. (1981) The effects of cooperative, competitive and individualistic goal structures on achievement. A meta-analysis. Psychological Bulletin, 89(1), 47-62. Lawrence, D, 1996. Enhacing Self Esteem in classroom. Paul Chapman Publishing Ltd, London. Pp 224. Lederman, N and Abd-El-Khalick, F (1998): Avoiding De-Natured Science: Activities that Promote Understandings of the Nature of Science In: W. F. McComas (Ed.). The Nature of Science in Science Education. Rationales and Strategies. (83-126). The Netherlands: Kluwer Academic. Pp. 388. McDermott, L. C. (1990). A perspective on teacher preparation in physics and other sciences: the need for special science courses for teachers. American Journal of Physics, 58(8):734-742. Pujol, R.M. (2003). Didáctica de las ciencias en la educación primaria. Madrid: Síntesis. Shachar, H and Fischer, S., 2004. Cooperative learning and the achievement of motivatioin and perceptions of students in 11th grade chemistry classes. Learning and Instruction, 14: 69-87.

  4. PASCOS 2012 - 18th International Symposium on Particles Strings and Cosmology

    NASA Astrophysics Data System (ADS)

    2014-03-01

    The XVII International Conference on Strings, Particles and Cosmology, PASCOS 2012, was held in the City of Mérida, Mexico, from June 3-8, 2012. The conference series is aimed at exploring the interface and interplay between particle physics, string theory and cosmology. With the advent of new data, the emphasis of the XVIII edition of PASCOS was on phenomenology and the interpretation of recent observational and experimental results. The conference followed the format of previous conferences in this series, with plenary reviews and contributed presentations in parallel sessions. The lectures covered a wide range of subjects which included: Dark matter and dark energy, flavor physics and CP violation, neutrino physics, supersymmetry, Higgs physics, baryogenesis and EDMs, supergravity, high energy cosmic rays, string and F-theory GUTs, and string phenomenology. This is the first time that PASCOS was held in Latin America. The aim to do it in Mexico was to engage the Latin American community and thus to bring the conference to a wider and different audience, a goal which was thoroughly achieved. The venue was held at the Hotel Fiesta Americana in the beautiful city of Mérida. The social events included a reception with typical local food at the Katun restaurant, conference dinner at the historical Quinta Montes Molina, and an excursion to the archeological site of Dzibilchaltún including a swim at the famous cenote. PASCOS 2012 was possible thanks to the generous support of the following sponsors: CONACyT (Consejo Nacional de Ciencia y Tecnología), UNAM (Universidad Nacional Autónoma de México: Consejo Técnico de la Investigación Científica, Instituto de Ciencias Nucleares, Instituto de Física), Cinvestav, (Centro de Estudios Avanzados del IPN: U. Zacatanco, U. Mérida and Secretaría General), ICyTDF (Instituto Científico y Tecnológico del D.F.), PIFI (Programa Integral de Fortalecimiento Institucional, Universidad de Guanajuato, Campus León), SMF

  5. Assessing the Record of Anoxic/Dysoxic Events in Lower Aptian Cupido/La Peña Formations, Northeastern Mexico

    NASA Astrophysics Data System (ADS)

    Maurrasse, F. J.; Barragan-Manzo, R.; Ponton, C.

    2008-05-01

    -thick each that are remarkably devoid of benthic foraminifers. They occur at 5. 72 m, 11.45m and 29.6 m, respectively, below the La Peña Fm. Variations within the Cupido Fm are consistent with fluctuating high- productivity, well-oxygenated neritic environment punctuated by development of hypoxic to anoxic bottom waters (Maurrasse et al., 2006). These recurrent episodes of severe oxygen depletion fall within the time interval that may be correlational with the infrajacent D. deshayesi to possibly the D. wessi zones in the Mediterranean ammonite biozonation scheme. We interpret these horizons to represent recurrent hypoxic to anoxic bottom conditions that are local expression of global forcing factors during Cretaceous greenhouse conditions that lead to well-defined OAE-1a and the subsequent anoxic events. Barragan-Manzo, R., and Maurrasse, F., (2008) Revista Mexicana de Ciencias Geologicas, v. 25, 1, p. 145-157. Barragan-Manzo, R., and Mendez-Franco, 2005, Towards a standard ammonite zonation for the Aptian (Lower Cretaceous) of northern Mexico. Revista Mexicana de Ciencias Geologicas, v. 22, 1, p. 39-47. Maurrasse, F. J-M. R., Barragan-Manzo, R., and Ponton, C. 2006, Cupido- La Peña Formations: High-Productivity to Super-Productivity during the Cretaceous Enhanced Greenhouse Conditions, GSA Abst.with programs v. 38, no 7, p. 491.

  6. Galaxy populations in the Antlia cluster - III. Properties of faint early-type galaxies

    NASA Astrophysics Data System (ADS)

    Smith Castelli, Analía. V.; Cellone, Sergio A.; Faifer, Favio R.; Bassino, Lilia P.; Richtler, Tom; Romero, Gisela A.; Calderón, Juan Pablo; Caso, Juan Pablo

    2012-01-01

    distribution of the member sample confirms the existence of two groups in Antlia, each one dominated by a giant elliptical galaxy and with one cE located close to each giant. Size and position, with respect to massive galaxies, of the dSph candidates are estimated and compared to Local Group counterparts. Based on observations carried out at the Cerro Tololo Inter-American Observatory (Chile), at Las Campanas Observatory (Chile) and at the European Southern Observatory, Paranal (Chile). Also based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministerio da Ciencia e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

  7. PREFACE: Particles and Fields: Classical and Quantum

    NASA Astrophysics Data System (ADS)

    Asorey, M.; Clemente-Gallardo, J.; Marmo, G.

    2007-07-01

    This volume contains some of the contributions to the Conference Particles and Fields: Classical and Quantum, which was held at Jaca (Spain) in September 2006 to honour George Sudarshan on his 75th birthday. Former and current students, associates and friends came to Jaca to share a few wonderful days with George and his family and to present some contributions of their present work as influenced by George's impressive achievements. This book summarizes those scientific contributions which are presented as a modest homage to the master, collaborator and friend. At the social ceremonies various speakers were able to recall instances of his life-long activity in India, the United States and Europe, adding colourful remarks on the friendly and intense atmosphere which surrounded those collaborations, some of which continued for several decades. This meeting would not have been possible without the financial support of several institutions. We are deeply indebted to Universidad de Zaragoza, Ministerio de Educación y Ciencia de España (CICYT), Departamento de Ciencia, Tecnología y Universidad del Gobierno de Aragón, Universitá di Napoli 'Federico II' and Istituto Nazionale di Fisica Nucleare. Finally, we would like to thank the participants, and particularly George's family, for their contribution to the wonderful atmosphere achieved during the Conference. We would like also to acknowledge the authors of the papers collected in the present volume, the members of the Scientific Committee for their guidance and support and the referees for their generous work. M Asorey, J Clemente-Gallardo and G Marmo The Local Organizing Committee George Sudarshan George Sudarshan

    International Advisory Committee

  8. Turning Back the Clock: Inferring the History of the Eight O'clock Arc

    NASA Astrophysics Data System (ADS)

    Finkelstein, Steven L.; Papovich, Casey; Rudnick, Gregory; Egami, Eiichi; Le Floc'h, Emeric; Rieke, Marcia J.; Rigby, Jane R.; Willmer, Christopher N. A.

    2009-07-01

    , Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (USA), the Science and Technology Facilities Council (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministerio da Ciencia e Tecnologia (Brazil), and SECYT (Argentina). Some of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

  9. PREFACE: Collapse Calderas Workshop

    NASA Astrophysics Data System (ADS)

    Gottsmann, Jo; Aguirre-Diaz, Gerardo

    2008-10-01

    (IAVCEI), the International Union of Geodesy and Geophysics (IUGG), the Universidad Nacional Autónoma de México (UNAM) through the Coordinación de la Investigación Científica, the Institute of Physics Publishing services, the Consejo Nacional de Ciencia y Tecnología de Querétaro (CONCYTEQ). The workshop represented the key activity of the IAVCEI Commission on Collapse Calderas in 2008. We, the workshop organizers, would like to express our gratitude to all workshop participants, the staff of Misión La Muralla, the Centro de Geociencias of UNAM for administrative and logistic support, to Adelina Geyer for web support, to María Inés Rojano for organization of logistics, the Universidad Autónoma de San Luis Potosí for logistics support, the Comisiòn Nacional de Electricidad for authorizing a visit to Los Azufres geothermal field, and to all sponsors that provided financial support. We expect these proceedings to stimulate further fruitful discussions, which we hope will be continued at a future meeting. Jo Gottsmann and Gerardo Aguirre-Diaz October 2008

  10. PREFACE: TNT 2004: Trends in Nanotechnology

    NASA Astrophysics Data System (ADS)

    Correia, Antonio; Serena, Pedro A.; Saenz, Juan Jose; Welland, Mark; Reifenberger, Ron

    2005-05-01

    were awarded. We would like to thank all the participants for their assistance, as well as the authors for their written contributions. TNT2004 is the successful consequence of a coordinated effort from several institutions: PHANTOMS Foundation, Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas, Universidad Carlos III de Madrid, Universidad Complutense de Madrid, Universidad SEK, Universidad de Salamanca, CMP Científica, University of Cambridge/IRC, NIMS, Nanotechnology Research Institute (NRI), University of Purdue, Georgia Institute of Technology and IEEE. In addition, we are indebted to the following institutions, companies and government agencies for their help and financial support: PHANTOMS Network/European Commission (IST/FET Program), NASA, Air Force Office of Scientific Research, Motorola, IoP, iNANO, NSERC/CRSNG (Nano Innovation Platform), Junta de Castilla y León, Donostia International Physics Center, Sociedad de Microscopía Española (SME), Nanonet, Wiley-VCH, Raith GmbH, The European Office of Aerospace Research and Development (EOARD), The Office of Naval Research International Field Office (ONRIFO), World Scientific and Imperial College Press, Ministerio de Educación y Ciencia, Parque Científico de Barcelona and Parque Científico de Madrid. We would also like to thank the following companies for their participation: NanoTec, Raith GmbH, Scientec, BFI Optilas, Schaefer, Interface Ltd, World Scientific and Imperial College Press and Institute of Physics Publishing. We invite readers of this special issue to join us at the next `Trends in Nanotechnology' conference, which will take place at Oviedo (Spain) in 2005, (http://www.tnt2005.org).

  11. Supernovae: lights in the darkness

    NASA Astrophysics Data System (ADS)

    both things. From the beginning of the nineties, when CGRO discovered the cosmological character of these phenomena, the GRB have constituted one of the most exciting problems of modern Astrophysics. The stellar end products that leave supernovae, are as interesting as supernovae themselves. On one hand, as we previously said, they completely determine the chemical evolution of the Galaxy, which is fundamental for the formation of planets or, even, for the appearance of life. On the other hand, they leave collapsed objects such as neutron stars and black holes that give rise to a wide range of violent phenomena: x-rays eruptions, microquasars, acceleration of particles to high energies, etc. The goal of this workshop was to bring together scientists with a deep insight into these topics and advanced PhD students, with the purpose of discussing in depth the remaining problems. The organizers are specially grateful to DIUE-Generalitat de Catalunya, Ministerio de Educación y Ciencia, Balearic Island University, Barcelona University, Polythecnical University of Catalonia, Valencia University, CSIC and IFAE for their economical support.

  12. Education Through Aerospace Components. (Spanish Title: Educación Através de Elementos Aeroespaciales.) Educação Através de Elementos Aeroespaciais

    NASA Astrophysics Data System (ADS)

    Barbosa Loureda, Oswaldo; Sobral de Araújo, Jéssyca B.

    2008-12-01

    Education is a field that needs development. For such purposes, there are various methods and tools that suggest ideas in favor of the improvement of the Brazilian people in the pedagogical, psychological and cultural aspects. Teaching is an act that demands a lot of care and responsibility; the behavior and performance of an individual in the society is the result of way that people was educated. However, the area of hard sciences demands a special attention, because the acquired knowledge is essential for the personal development of the individual and the technological future of the country. As an alternative or complementary tool for education it is suggested the use of aerospace element, since they show a vast amount of subjects qualitatively dealing with abilities of great importance for the future professional life of the students. A new Race happens, however this time the goal is not the Moon, but knowledge. El área educacional es un campo que necesita desarrollo. Para esto se dispone de diversos métodos y medios que pueden implantar ideas en pro del avance del pueblo brasilero en los aspectos pedagógicos, psicológicos y culturales. Alfabetizar es un acto que exige mucho cuidado y responsabilidad; el comportamento y desempeño de un individuo en la sociedad es el resultado de la manera en que fue educado. En particular, el área de ciencias exactas exige especial atención, pues los conocimientos adquiridos son imprescindibles para el desarrollo personal del individuo y también para el futuro tecnológico del País. Como medio alternativo o complementar de enseñanza se sugiere el uso de elementos aeroespaciales, debido a que compreende una vasta cantidad de disciplinas cualitativamente involucradas en la adquisición de habilidades de gran importancia para su vida profesional futura. Una nueva Carrera está em marcha, sin embargo esta vez la meta no es la Luna, sino el conocimiento. A área educacional é um campo que necessita de desenvolvimento. Para

  13. [Not Available].

    PubMed

    Navarro-González, Inmaculada; Ros, Gaspar; Martínez-García, Brígida; Rodríguez-Tadeo, Alejandra; Periago, M Jesús

    2016-01-01

    Introducción y objetivos: la evolución que ha experimentado en los últimos años la sociedad española ha originado una serie de cambios sociológicos y/o culturales que afectan claramente a los hábitos y preferencias alimentarias. El objetivo del presente trabajo ha sido evaluar la adherencia a la dieta mediterránea (DM) de la población universitaria en la ciudad de Murcia y la calidad de su desayuno, estableciendo la relación existente entre estas dos variables entre sí, y otras variables sociológicas analizadas.Métodos: se evaluó la adherencia a la DM en una muestra de 312 estudiantes mediante el test KIDMED, cuestionario de 16 preguntas. La calidad del desayuno fue determinada en función de la ingesta de los distintos grupos de alimentos (lácteos, cereales y frutas), de forma que se establecieron las siguientes categorías de calidad: pésima, mala, regular y buena. De cada encuestado se registraron los datos personales, lugar de origen, zona geográfica y tipo de residencia, sexo, edad, titulación universitaria, curso y las variables antropométricas (peso, altura, perímetro de cintura y cadera).Resultados: la muestra estuvo formada por 238 mujeres y 74 hombres todos ellos estudiantes universitarios de distintos títulos de grado. El 7,85% de los universitarios mostró una baja adherencia a la DM, el 48,4% media y el 43,8% alta. Los estudiantes de grado en Educación Primaria mostraron una mayor adherencia media a la DM; los estudiantes de grado en Enfermería tomaron más de una ración de verdura al día; y los de Ciencia y Tecnología de los Alimentos consumían una pieza de fruta al día. Teniendo en cuenta el sexo de los participantes, el 37,8% de las mujeres tomaban más de una verdura diaria y el 91,5% desayunaba bollería industrial; mientras que el 54,1% de los hombres tomaban frutos secos (al menos 2 o 3 veces por semana) y el 74,5% desayunaba todos los días. El 1,15% de los estudiantes mostró una calidad del desayuno pésima, el 17

  14. Preface

    NASA Astrophysics Data System (ADS)

    Mallamace, Francesco; Quintana, Jacqueline

    2002-03-01

    -of-equilibrium dynamics, non-linear dynamics, chaos, turbulence and chaotic dynamics. The present issue contains a substantial number of the invited and contributed talks presented at the meeting. We made an effort to arrange these papers with an order similar to that of presentation during the meeting. It is our pleasure to thank the scientific committee, all the speakers, the session chairs and all participants who contributed to the success of the conference. We are grateful to the Bonino-Pulejo Foundation (Messina-Italy), and to the President On. Nino Calarco, for the Patronage and the enthusiastic support. Our thanks goes also for the Messina University, the INFM (Istituto Nazionale per la Fisica della Materia, Italy), the Consejo Nacional de Ciencia y Tecnología (CONACyT, Mexico) and the Universidad Nacional Autonoma de Mexico (UNAM). The Conference was sponsored by the INFM-Sec.C, CONACyT, UNAM, the Bonino-Pulejo Foundation which contributed financial support to participants and to the publication of the present issue. We are grateful to them for the support. Last, but not the least, we express our warmest gratitude to all the members of the local organizing committee for their assistance and for the work spent in organizing this meeting and especially to Professor~Alberto Robledo for his valuable advice.

  15. The Space Place: Multifarious Merchandise for Omnifarious Folks

    NASA Astrophysics Data System (ADS)

    Leon, N. J.; Fisher, D. K.

    2002-12-01

    partners receive individual attention. Each receives the Space Place display materials, updated with quarterly mailings and the quarterly activity guides. Another product is a monthly Space Place newspaper column written for children. This column is currently published in 14 English language newspapers and 7 Spanish language newspapers, with a combined daily circulation of over 2.5 million copies. And, for the target audience that has neither internet nor newspaper access, The Space Place has a toll free phone line (1-866-575-6178) with answers to often-asked questions about space sent in by the community partners. The monthly phone message is also given in Spanish. Evidence continuously points to the success of The Space Place program at reaching its target audience. Counts of visitors to the Web site continue to grow, as does the number of awards for its excellence and educational merit. The inauguration of its Spanish version was marked with coverage by CNN en Espa¤ol and BBC Ciencia (radio program). Feedback from community partners is extremely positive, and the number of partners continues to grow. The number of both English and Spanish language newspapers wishing to carry The Space Place column is also growing. The Space Place program owes its success, first of all, to the quality and diversity of its products, whatever language they are in. But without appropriate and effective partnerships for their dissemination, they would be worthless. With both, the winners are the youth who can see the excitement and hope of science, technology, and NASA's programs-youth who might not otherwise recognize their choices.

  16. Memories of Astronomy Education in Brazil: Clippings from the Discourses of Interviewed Researchers on the Subject. (Spanish Title: Memorias de la Educación en Astronomía en Brasil: Recortes de los Discursos de Investigadores Entrevistados Acerca del Tema ) Memórias da Educação em Astronomia no Brasil: Recortes a Partir das Falas de Pesquisadores Entrevistados sobre o Tema

    NASA Astrophysics Data System (ADS)

    Iachel, Gustavo; Nardi, Roberto

    2014-12-01

    This paper presents a historical retrospective concerning data from a research in Astronomy Education in Brazil, after 1973. It was organized on the basis of the speech analysis of national researchers considered references in this field by their peers. Furthermore, it was elaborated on the basis of other studies from the areas of Science Education, Physics and Astronomy. This historical overview was developed in order to facilitate understanding of the contexts in which the interviewed researchers have developed professionally. Moreover, we attempted to recover the memory of the growing field of research in Astronomy Education in the country. We believe that the history presented can help those trying to understand the past in an attempt to resolve current and future demands. Se presenta en este artículo una retrospectiva histórica referente a datos provenientes de la investigación en enseñanza de la astronomía en el Brasil, después de 1973, organizada sobre la base del análisis de los discursos de los investigadores nacionales considerados referencias en este campo, y también en la lectura de las publicaciones en las áreas de Enseñanza de las Ciencias, Física y Astronomía. Este repaso histórico se desarrolló con el fin de facilitar la comprensión de los contextos en los que los investigadores entrevistados se han desarrollado profesionalmente. Por otra parte, se intentó recuperar la memoria del creciente campo de la investigación en Educación en Astronomía en el país. Creemos que el relato presentado puede contribuir a quien trata de comprender el pasado, en un intento de resolver las demandas actuales y futuras. Relata-se neste artigo uma retrospectiva histórica referente a dados provenientes de pesquisa em Educação em Astronomia no país, pós 1973, organizada com base na análise das falas de pesquisadores considerados referências nacionais nesse campo, como também na leitura de publicações das áreas de ensino de Ciências, F

  17. A multimedia and interactive approach to teach soil science

    NASA Astrophysics Data System (ADS)

    Badía-Villas, D.; Martí-Dalmau, C.; Iñiguez-Remón, E.

    2012-04-01

    lectures, real field visits and other learning activities on soil sciences. The development of these programmes has been sponsored by the Spanish Ministry of Science and Innovation (Fundación Española para la Ciencia y la Tecnología, FECYT) and it has won the "Félix de Azara" Award (2011). Çaliskan, O. (2011). Virtual field trips in education of earth and environmental sciences. Procedia Social and Behavioral Sciences, 15: 3229-3243. Churchman, G. J. (2010). The philosophical status of soil science. Geoderma 157, 214-221. European Commission (2006). Thematic strategy for soil protection. COM (2006) 231. Field D.J., A. J. Koppi, L. E. Jarrett, L. K. Abbott, S. R. Cattle, C. D. Grant, A. B. McBratney, N. W. Menzies, A. J. Weatherley (2011). Soil Science teaching principles. Geoderma, 167-168: 9-14. IUSS Working Group WRB (2007). World Reference Base for Soil Resources 2006, fist update 2007. World Soil Resources Reports n° 103. FAO. Rome.

  18. [In Process Citation].

    PubMed

    Aguilar Cordero, María José; Rodríguez Blanquet, Raquel; Sánchez García, Juan Carlos; Sánchez López, Antonio Manuel; Baena García, Laura; López Contreras, Gracia

    2016-01-01

    Introducción: el entrenamiento mediante ejercicio físico moderado durante el periodo de gestación aporta beneficios tanto a la mujer embarazada como al feto. Los trabajos de investigación consultados vinculan la actividad física con una reducción del número de cesáreas, de partos instrumentados y con un parto más fisiológico. Previene igualmente la ganancia excesiva de peso de la mujer, disminuye el riesgo de diabetes gestacional y de hipertensión arterial.Objetivo: el objetivo de esta investigación es conocer si un programa de ejercicio físico de carácter moderado con el método Study Water Exercise Pregnant (SWEP), realizado en un medio acuático, contribuye a obtener unos resultados más favorables en la etapa perinatal, tanto para la mujer como para el bebé.Material y métodos: el diseño que se llevará a cabo es un ensayo clínico aleatorizado. La muestra estará constituida por 364 gestantes, obtenida de un universo total de 6.579 partos acontecidos en Granada (España) durante el año 2014. Dicha muestra se ha dividido en dos grupos, uno de intervención y otro de control. La actividad se realizará en las instalaciones deportivas acuáticas de la Facultad de Ciencias del Deporte de la Universidad de Granada, que cuentan con dos vasos adecuados a nuestros objetivos, uno polivalente de 25 metros y otro de enseñanza de 12,5 metros.  Resultados: el programa de ejercicios diseñado específicamente para el proyecto denominado SWEP, abarca desde la 20 hasta la 37 semana de gestación (SG) y consta de tres sesiones semanales, con una duración de 60 minutos cada una. Las sesiones incluirán tres fases: fase de calentamiento, fase principal en la que el ejercicio se divide en una parte aeróbica y otra de ejercicios de fuerza y resistencia y una final con estiramientos y relajación. Las variables que se van a estudiar son las siguientes: a) maternas: peso, IMC, tensión arterial, test de O´Sullivan, aparición de depresión postparto

  19. Soils as records of past and present environments

    NASA Astrophysics Data System (ADS)

    Sauer, Daniela

    2015-04-01

    (i) rapidly adjusting soil properties (adjusting within some hundreds of years), (ii) slowly adjusting soil properties (adjusting within some thousands of years), and (iii) persistent soil properties (showing no changes over ten thousands to millions of years). In a polygenetic soil, rapidly adjusting soil properties may already be in equilibrium with the present conditions, whereas slowly adjusting soil properties may still reflect past conditions. Thus, the lower the rate at which a certain soil property in a polygenetic soil adjusts, the larger is the extent to which this property is still determined by earlier environmental conditions. Knowledge on the rates at which soil properties adjust may hence be used to estimate the time at which a significant environmental change took place, based on the degree of overprinting of the different kinds of soil properties adjusting at different rates in a polygenetic soil. References: Richter, D. de B., Yaalon, D.H., 2012. "The changing model of soil" revisited. Soil Sci. Soc. Am. J. 76, 766-778. Targulian, V. O., Goryachkin, S. V., 2004. Soil memory: Types of records, carriers, hierarchy and diversity. Revista Mexicana Ciencias Geol. 21, 1-8. Targulian, V.O., Gerasimova, M., 2009. Soil geography: geography of soil systems and soil bodies. Soil Geography: New Horizons. International Conference, 16-20 November 2009 in Huatulco, Mexico. Book of abstracts, 39. Yaalon, D.H., 1971. Soil forming processes in time and space. In: Yaalon, D.H. (Ed.), Paleopedology-origin, nature and dating of paleosols. Int. Soc. Soil Sci. and Israel Univ. Press, Jerusalem, pp. 29-39.

  20. U.S., European ALMA Partners Award Prototype Antenna Contracts

    NASA Astrophysics Data System (ADS)

    2000-03-01

    ) elevation. All previous millimeter-wavelength antennas that meet such exacting specifications for surface accuracy and pointing accuracy have been housed within telescope enclosures. The U.S. and European prototype antennas will be delivered to the NRAO VLA site, near Socorro, New Mexico, in October and November of 2001, respectively. Preparations for ALMA prototype testing are already underway at the VLA site. Three pads are being constructed for the antennas to rest on. An ALMA control room within the VLA control building is being established. About ten full-time ALMA staff will be involved in the testing. Additionally, ALMA project members from around the U.S. and the world will visit the VLA site to participate in the test program. The two prototype antennas will first be tested separately. Following that, the two will be linked together and tested as an interferometer. Millimeter-wave astronomy is the study of the universe in the spectral region between what is traditionally considered radio waves and infrared radiation. In this realm, ALMA will study the structure of the early universe and the evolution of galaxies; gather crucial data on the formation of stars, protoplanetary disks, and planets; and provide new insights on the familiar objects of our own solar system. ALMA is an international partnership between the United States (National Science Foundation) and Europe. European participants include the member states of the European Southern Observatory (Belgium, Denmark, France, Germany, Italy, the Netherlands, Sweden and Switzerland), the Centre National de la Recherche Scientifique (France), the Max-Planck Gesellschaft (Germany), the Netherlands Foundation for Research in Astronomy, the United Kingdom Particle Physics and Astronomy Research Council, the Oficina de Ciencia Y Tecnologia/Instituto Geografico Nacional OCYT/IGN (Spain), and the Swedish Natural Science Research Council (NFR). The project is currently in a Design and Development phase governed by a

  21. PREFACE: Particles and Fields: Classical and Quantum

    NASA Astrophysics Data System (ADS)

    Asorey, M.; Clemente-Gallardo, J.; Marmo, G.

    2007-07-01

    This volume contains some of the contributions to the Conference Particles and Fields: Classical and Quantum, which was held at Jaca (Spain) in September 2006 to honour George Sudarshan on his 75th birthday. Former and current students, associates and friends came to Jaca to share a few wonderful days with George and his family and to present some contributions of their present work as influenced by George's impressive achievements. This book summarizes those scientific contributions which are presented as a modest homage to the master, collaborator and friend. At the social ceremonies various speakers were able to recall instances of his life-long activity in India, the United States and Europe, adding colourful remarks on the friendly and intense atmosphere which surrounded those collaborations, some of which continued for several decades. This meeting would not have been possible without the financial support of several institutions. We are deeply indebted to Universidad de Zaragoza, Ministerio de Educación y Ciencia de España (CICYT), Departamento de Ciencia, Tecnología y Universidad del Gobierno de Aragón, Universitá di Napoli 'Federico II' and Istituto Nazionale di Fisica Nucleare. Finally, we would like to thank the participants, and particularly George's family, for their contribution to the wonderful atmosphere achieved during the Conference. We would like also to acknowledge the authors of the papers collected in the present volume, the members of the Scientific Committee for their guidance and support and the referees for their generous work. M Asorey, J Clemente-Gallardo and G Marmo The Local Organizing Committee George Sudarshan George Sudarshan

    International Advisory Committee

  22. A. Ashtekhar (Pennsylvania State University, USA)
    L. J. Boya (Universidad de Zaragoza, Spain)
    I. Cirac (Max Planck Institute, Garching

  23. Astronomy in the Classroom: Why? (Spanish Title: Astronomía en la Clase: ¿Por Qué?) Astronomia na Sala de Aula: Por Quê?

    NASA Astrophysics Data System (ADS)

    Daros Gama, Leandro; Bagdonas Henrique, Alexandre

    2010-07-01

    There are many discussions about the relevance of the topics covered in classes. One subject in particular is the focus of this essay: astronomy. In what sense and to what extent it would be worth to teach it in science or other kind of classes? In this paper we discuss some aspects of the advantages of dealing with this area of knowledge in schools, taking into account the epistemological and axiological dimensions of astronomy, in light of the vision of science as an intelligent dialogue with the world (Bachelard), in addition to the "problematization" knowledge of Paulo Freire. We propose that in fact the Astronomy does not need to be seen as just a new set of contents to be taught, but appears as a set of motivational contents for historical-philosophical discussions, and permit the discussion of concepts of other disciplines. Numerosas discusiones se están llevando a cabo acerca de la pertinencia de los temas tradicionalmente tratados en las clases. Uno de los temas, en particular, es el foco de este ensayo: la astronomía. ¿En qué sentido y en qué medida sería conveniente tratarla en clase, ya sea en clases de ciencias naturales, específicamente en las de astronomía o asignaturas afines? Elaboramos en este artículo algunos aspectos de las ventajas de tratar esta área del conocimiento en las escuelas, teniendo en cuenta las dimensiones epistemológica y axiológica de la astronomía, a la luz de la visión de la ciencia como un diálogo inteligente con el mundo (Bachelard), además de la propuesta del conocimiento "problematizador" de Paulo Freire. Proponemos que en realidad la astronomía no tiene por qué ser vista sólo como un nuevo conjunto de contenidos que se enseñan, sino que aparece como un conjunto de temas de motivación para el debate histórico-filosófico y para permitir la discusión de los conceptos típicos de otras disciplinas. Muitas discussões vêm acontecendo sobre a relevância dos temas abordados em sala de aula. Um tema, em

  24. Alfabetización en Astronomía de docentes de Educación Primaria y de Educación Secundaria en La Plata

    NASA Astrophysics Data System (ADS)

    De Biasi, M. S.; Orellana, R. B.

    2014-10-01

    La educación de este siglo tiene como uno de sus retos alcanzar la alfabetización cientfica de todos los ciudadanos para que comprendan y tomen decisiones sobre el mundo natural y sus cambios originados por la actividad humana utilizando el conocimiento científico. En esta misión los docentes de los niveles obligatorios de enseñanza juegan un papel clave por su rol de agentes multiplicadores del conocimiento. Se requiere, entonces de una adecuada alfabetización en ciencias de los docentes o, como mínimo, que dominen los temas científicos a enseñar. En el campo de la Astronomía, numerosas investigaciones han señalado que maestros de primaria y estudiantes de profesorados poseen una escasa formación en estos temas (Camino 1995 y 1999, Gangui 2010), que frecuentemente presentan a los alumnos concepciones alternativas o no científicas de los fenómenos astronómicos cotidianos (Kriner 2004, Vega Navarro 2007, Gangui et al 2010); a lo que se suma la presentación confusa o errónea de algunos temas astronómicos en los textos escolares (Kriner 2004). Desde 2011, la Facultad de Ciencias Astronómicas y Geofísicas, UNLP, ofrece un curso de capacitación destinado a fortalecer y actualizar los contenidos académicos y didácticos de los docentes del distrito La Plata utilizando diversas estrategias didácticas. Los contenidos comprenden los temas astronómicos de los diseños curriculares vigentes. La evaluación diagnóstica de los conocimientos previos de los docentes cursantes sobre los contenidos de mayor presencia en los diseños curriculares mostró resultados similares a las investigaciones arriba mencionadas. Referente a los movimientos de la Tierra, en promedio, el 54% poseía conceptos erróneos y el 16% no los sabía; con referencia a la Luna el 56% poseía conceptos erróneos y un 4% no los sabía. Los resultados del curso mostraron que el 95% de los docentes revirtió sus conceptos previos erróneos, que adquirió criterios para la búsqueda de

  25. Earth and Heavens: Two Separate Universes? (Spanish Title: Tierra y Cielos: ¿Dos Universos Separados?) Terra e Céus: Dois Universos Separados?

    NASA Astrophysics Data System (ADS)

    Carrascosa, Jaime; Gil-Pérez, Daniel; Solbes, Jordi; Vilches, Amparo

    2005-12-01

    The study of gravitation constitutes an exceptional occasion to show the richness and complexity of science and technology, contemplating, among other things: the problematic situations which are at the heart of the scientific knowledge, the difficulties encountered in the construction of knowledge and, especially, the necessity of overcoming "common-sense evidence" that proclaimed the existence of an insurmountable barrier between Earth and Heavens, hindering scientific development during many centuries. In this paper we present a program of activities to orient the study of Gravitation atUpperHigh School, favoring students' participation in the reconstruction of this first scientific revolution and giving them the opportunity to see the importance of Astronomy both in the history of science and today. El estudio de la gravitación constituye una ocasión excepcional para mostrar la ciencia y la tecnología en toda su riqueza y complejidad, considerando, entre otros aspectos:

  26. Las situaciones problemáticas relevantes que llevaron a la construcción de los conocimientos,
  27. las dificultades de todo tipo con las que hubo que enfrentarse y, muy en particular,
  28. la necesidad de superar las "evidencias de sentido común" que establecían una supuesta barrera infranqueable entre la Tierray los Cielos y que obstaculizaron durante siglos el desarrollo científico.
  29. En este trabajo presentamos un programa de actividades para el estudio de la gravitación en la secundaria superior, orientado a favorecer la participación de los estudiantes, en alguna medida, en la reconstrucción de este proceso que constituyó la denominada primera gran revolución científica y asomándonos al estudio de una de las ciencias más antiguas, la Astronomía, que hoy sigue despertando gran interés. O estudo da gravitação constitui uma ocasião excepcional para mostrar a ciência e a tecnologia em toda sua riqueza e

  30. Chile's dilemma: how to reinsert scientists trained abroad.

    PubMed

    Nunez-Parra, Alexia; Ramos, Maria-Paz

    2014-01-01

    Chile is recognized worldwide as an emergent economy, with a great power in natural resource exploitation. Nonetheless, despite being one of the most developed countries in Latin America, Chile imports most of the knowledge and technology necessary to drive innovation in the country. The tight budget that the Chilean government assigned to research and development and the absence of a long-term scientific agenda contributed to a limited supply of scientists over the years. In an effort to reverse this scenario, Chile has created several fellowships, such as the Becas Chile Program (BCP) to encourage new generations to pursue graduate studies to ultimately advance research and development in situ. More than 6000 fellows are now being trained abroad, accumulating an incredible potential to transform the Chilean scientific environment as we know it.  Chile now faces a greater challenge: it has to offer infrastructure and job openings to the highly skilled professionals in whom it invested. Unfortunately no clear public policies to address this situation have been developed, partially due to the lack of a dedicated institution, such as a Ministry for Science and Technology which could focalize the necessary efforts to promote such policies. Therefore, in the meantime, Chilean scientist have been motivated to create different organizations, such as, Mas Ciencia para Chile and Nexos Chile-USA, to promote constructive discussion of the policies that could be implemented to improve the Chilean scientific situation. We hope that these and other organizations have a real impact on the generation of scientific guidelines that will finally contribute to the development of the country. PMID:25309739

  31. Association between Facebook Dependence and Poor Sleep Quality: A Study in a Sample of Undergraduate Students in Peru

    PubMed Central

    Wolniczak, Isabella; Cáceres-DelAguila, José Alonso; Palma-Ardiles, Gabriela; Arroyo, Karen J.; Solís-Visscher, Rodrigo; Paredes-Yauri, Stephania; Mego-Aquije, Karina; Bernabe-Ortiz, Antonio

    2013-01-01

    Objectives Internet can accelerate information exchange. Social networks are the most accessed especially Facebook. This kind of networks might create dependency with several negative consequences in people’s life. The aim of this study was to assess potential association between Facebook dependence and poor sleep quality. Methodology/Principal Findings A cross sectional study was performed enrolling undergraduate students of the Universidad Peruana de Ciencias Aplicadas, Lima, Peru. The Internet Addiction Questionnaire, adapted to the Facebook case, and the Pittsburgh Sleep Quality Index, were used. A global score of 6 or greater was defined as the cutoff to determine poor sleep quality. Generalized linear model were used to determine prevalence ratios (PR) and 95% confidence intervals (95%CI). A total of 418 students were analyzed; of them, 322 (77.0%) were women, with a mean age of 20.1 (SD: 2.5) years. Facebook dependence was found in 8.6% (95% CI: 5.9%–11.3%), whereas poor sleep quality was present in 55.0% (95% CI: 50.2%–59.8%). A significant association between Facebook dependence and poor sleep quality mainly explained by daytime dysfunction was found (PR = 1.31; IC95%: 1.04–1.67) after adjusting for age, sex and years in the faculty. Conclusions There is a relationship between Facebook dependence and poor quality of sleep. More than half of students reported poor sleep quality. Strategies to moderate the use of this social network and to improve sleep quality in this population are needed. PMID:23554978

  32. Follow the Mars Express launch from one of ESA's establishments

    NASA Astrophysics Data System (ADS)

    2003-05-01

    Europe’s first mission to the Red Planet will reach its target in December, after a six-month journey. Mars Express will help scientists answer questions about the Martian landscape, atmosphere and the origin of life that remain open, although a wealth of information is already available. Media representatives in Europe can follow the launch and initial orbital operations at ESA/Darmstadt (ESOC) in Germany, which will be acting as the main European press centre, or ESA/Noordwijk (ESTEC) in the Netherlands. ESA/Frascati (ESRIN) in Italy and the Italian Space Agency, ASI, are organising a joint event at the University of Rome. ESA/Villafranca (VILSPA) and the CDTI, the Spanish institution in charge of space issues, are organising a joint event in Spain at the Museo Principe Felipe de la Ciudad de las Artes y las Ciencias in Valencia. At each site ESA specialists will be available for interviews. Media representatives wishing to attend are requested to complete the attached reply form and fax it to the Communication Office at the establishment of their choice. The ESA TV Service will provide live televised coverage of the launch and initial orbital operations with English commentary, between 19:15 and 22:00 CEST. Satellite: Astra 2C at 19 degrees East Reception frequency: 10832 MHz Polarisation: Horizontal Symbol rate: 22 Msymb/s FEC: 5/6 Service ID: 61950 Service name: ESA TXT: none Details of the transmission schedule and satellite details for the various pre-launch Video News Releases can be found on http://television.esa.int. The launch can also be followed live on the internet at www.esa.int/marsexpresslaunch starting at 19:15 hrs. Here you can also find the launch diary, news, press releases, videos, images and more.

  33. Desarrollo de un instrumento para medir percepciones sobre el contexto de construccion del conocimiento cientifico de estudiantes universitarios de nuevo ingreso

    NASA Astrophysics Data System (ADS)

    Garcia-Ramirez, Jaime Antonio

    En esta investigacion, se desarrollo un instrumento que permite medir percepciones relacionadas al contexto de constriccion del conocimiento cientifico. Se examinaron instrumentos existentes y se encontro que el VOSTS (Views on science, technology, and society), instrumento desarrollado empiricamente en Canada por Aikenhead, Ryan y Fleming, podia traducirse y validarse en el contexto cultural puertorriqueno. El instrumento es extenso, consta de 113 reactivos, cada uno con una premisa basica relacionada a la tematica ciencia, tecnologia y sociedad y un numero de alternativas relacionadas a la premisa que oscila entre siete y trece. Se delimito su utilizacion a los quince reactivos identificados por los autores como relacionados a la construccion social del conocimiento cientifico. Metodologicamente, se procedio a utilizar el modelo de adaptacion intercultural, que permite que el instrumento desarrollado satisfaga las dimensiones de equivalencia semantica, de contenido, tecnica, de criterio y conceptual, atemperado asi al instrumento original. Se cumplio con este proposito mediante la traduccion de la version original en ingles al espanol y viceversa. Se utilizaron comites para examinar la traduccion y la retro-traduccion del instrumento. Se realizo una prueba piloto con estudiantes universitarios de nuevo ingreso, utilizando el instrumento traducido para asegurar su intelegibilidad. La confiabilidad del instrumento se determino mediante la intervencion de un panel de expertos quienes clasificaron las distintas posiciones dentro de cada reactivo en: realista, con merito e ingenua; se transformaron estas opciones en valores numericos lo que permitio establecer una escala Likert para cada una. Se suministro el instrumento a una muestra de estudiantes universitarios de nuevo ingreso con caracteristicas similares a las de la poblacion puertorriquena en cuanto a ejecucion en las pruebas de aptitud verbal y matematica del College Board. Los resultados de sus contestaciones

  34. Alfabetización astronómica

    NASA Astrophysics Data System (ADS)

    Tignanelli, H.

    A fines de 1991, en una revista de educación en ciencias, José L. Sérsic reflexionaba acerca de los problemas que enfrentaría la enseñanza de los conocimientos astronómicos en nuestro país, en los umbrales del Siglo XXI. Entonces postulaba como un objetivo mínimo, que los jóvenes deberían mostrar signos claros de que se hallan astronómicamente alfabetizados. Era el año en que se realizaba por primera vez una Asamblea General de I.A.U. en Buenos Aires, una oportunidad de singulares características para la comunidad astronómica local y, simultáneamente el comienzo de un cambio radical en la estructura del sistema educativo argentino. ?`Contempla ese cambio el objetivo que postulara Sérsic? ?`Estamos en condiciones de afirmar que estamos en camino de lograrlo? ?`Con qué parámetros?. Presentamos aquí un panorama general sobre algunas de las acciones realizadas en función de alcanzar esa alfabetización científica, analizando exclusivamente la actividad de enseñanza hasta el nivel universitario, sin detenernos en el mismo, ya que lo consideramos una instancia superior e independiente de aquella alfabetización. Tampoco nos referiremos a la tarea de difusión, divulgación o popularización de la Astronomía, ya que su condición de asistemática y subjetiva no es evaluable en términos de la formación integral de un individuo.

  35. BEGIRA: Basque Educational Gate for Interactive and Remote Astronomy

    NASA Astrophysics Data System (ADS)

    Gorosabel, J.; Sánchez-Lavega, A.; Pérez Hoyos, S.; Hueso, R.

    2015-05-01

    The BEGIRA project consists in making available the 1.23 m Calar Alto (CAHA) telescope to students of the University of the Basque Country (UPV/EHU). The project is designed in such a way that undergraduate and graduate students of the Máster oficial en ciencia y tecnología espacial of the UPV/EHU can control remotely the 1.23 m CAHA telescope. The instrument used is the DLR camera, which based on its large field of view and high sensitivity, allows observations ranging from nearby solar system bodies to remote gamma-ray bursts. The students are also responsible of reducing and analyzing the resultant DLR data. The observations are conducted from the Aula Espazio Gela located at the Faculty of Engineering at Bilbao. The students can control remotely i) the 1.23 m telescope, ii) the DLR camera and iii) the autoguider. They have also continuous access to the observatory weather station, webcams, astrometric tools and the CAHA archive, so they can actually see in real-time what they are doing. The operations can be visualized by two light cannons which display the telescope and camera controls for the audience. In case of any emergency the students are backed up by the CAHA staff. The BEGIRA project shows the potential that remote control of professional telescopes has for educational purposes. As proven by the several discoveries carried out under BEGIRA, the educational activities can be complemented with cutting-edge research activities carried out by Master Students. In the coming years we plan to continue with the BEGIRA project. More information can be found at http://www.ehu.es/aula-espazio/begira/.

  36. Diagnosis of digestive functional disease by the statistics of continuous monitoring of esophageal acidity

    NASA Astrophysics Data System (ADS)

    Rivera Landa, Rogelio; Cardenas Cardenas, Eduardo; Fossion, Ruben; Pérez Zepeda, Mario Ulises

    2014-11-01

    Technological advances in the last few decennia allow the monitoring of many physiological observables in a continuous way, which in physics is called a "time series". The best studied physiological time series is that of the heart rhythm, which can be derived from an electrocardiogram (ECG). Studies have shown that a healthy heart is characterized by a complex time series and high heart rate variability (HRV). In adverse conditions, the cardiac time series degenerates towards randomness (as seen in, e.g., fibrillation) or rigidity (as seen in, e.g., ageing), both corresponding to a loss of HRV as described by, e.g., Golberger et. al [1]. Cardiac and digestive rhythms are regulated by the autonomous nervous system (ANS), that consists of two antagonistic branches, the orthosympathetic branch (ONS) that accelerates the cardiac rhythm but decelerates the digestive system, and the parasympathetic brand (PNS) that works in the opposite way. Because of this reason, one might expect that the statistics of gastro-esophageal time series, as described by Gardner et. al. [2,3], reflects the health state of the digestive system in a similar way as HRV in the cardiac case, described by Minocha et. al. In the present project, we apply statistical methods derived from HRV analysis to time series of esophageal acidity (24h pHmetry). The study is realized on data from a large patient population from the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán. Our focus is on patients with functional disease (symptoms but no anatomical damage). We find that traditional statistical approaches (e.g. Fourier spectral analysis) are unable to distinguish between different degenerations of the digestive system, such as gastric esophageal reflux disease (GERD) or functional gastrointestinal disorder (FGID).

  37. TEDESE project: preliminary results

    NASA Astrophysics Data System (ADS)

    Buforn, E.; Martín Dávila, J.; Bock, G.; Pazos, A.; Udías, A.; Hanka, H.; Gárate, J.; Perez Peña, A.

    2003-04-01

    The TEDESE (Terremotos y Deformación Cortical en el Sur de España) project is a joint project of the Universidad Complutense de Madrid (UCM) and Real Instituto y Observatorio de la Armada de San Fernando, Cádiz (ROA) supported by the Spanish Ministerio de Ciencia y Tecnología with the participation of the GeoforschungZentrum, Potsdam (GFZ). The project started on January 2001 and it will extend till December 2003. As part of this project a temporal network of 10 broad-band seismological stations, which will complete those already existing in the zone, have been installed for a period of 20 months (October 01-June 03) in southern Spain and northern Africa. This temporary net has recorded, till November 2002, more than 760 regional earthquakes, with magnitudes between 1.7 and 5.1. We have studied in detail two shallow events occurred in Gergal (Almería, SE Spain, 04-02- 02, M=5.0) and Bullas (Murcia, SE Span, 06-08-02, M=4.8), its aftershocks series and two intermediate depth (h=90km) earthquakes located in Málaga (Spain, M=4.5). GPS time series, from permanent GPS stations deployed at the region by ROA and other institutions, have been produced and velocity vectors have been derived. GPS data coming from previous periodic field campaigns carried out in the region by ROA since 1996 are being reprocessed, and a new GPS campaing is planned for June 2003.

  38. Post-maximum Near-infrared Spectra of SN 2014J: A Search for Interaction Signatures

    NASA Astrophysics Data System (ADS)

    Sand, D. J.; Hsiao, E. Y.; Banerjee, D. P. K.; Marion, G. H.; Diamond, T. R.; Joshi, V.; Parrent, J. T.; Phillips, M. M.; Stritzinger, M. D.; Venkataraman, V.

    2016-05-01

    We present near-infrared (NIR) spectroscopic and photometric observations of the nearby Type Ia SN 2014J. The 17 NIR spectra span epochs from +15.3 to +92.5 days after B-band maximum light, while the {{JHK}}s photometry include epochs from -10 to +71 days. These data are used to constrain the progenitor system of SN 2014J utilizing the Paβ line, following recent suggestions that this phase period and the NIR in particular are excellent for constraining the amount of swept-up hydrogen-rich material associated with a non-degenerate companion star. We find no evidence for Paβ emission lines in our post-maximum spectra, with a rough hydrogen mass limit of ≲ 0.1 M ⊙, which is consistent with previous limits in SN 2014J from late-time optical spectra of the Hα line. Nonetheless, the growing data set of high-quality NIR spectra holds the promise of very useful hydrogen constraints. Based on observations obtained at the Gemini Observatory under program GN-2014A-Q-8 (PI: Sand). Gemini is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

  39. The Light Curve Of The Dust Cloud Ejected By The Collision Between The Deep Impact Projectile And The Nucleus Of Comet 9P/Tempel 1

    NASA Astrophysics Data System (ADS)

    Kueppers, Michael; Rengel, M.; Keller, H. U.; Gutiérrez, P. J.; Hviid, S. F.

    2007-10-01

    When Deep Impact fired its projectile into the nucleus of comet 9P/Tempel 1, a cloud made of dust and icy grains was ejected from the impact crater. The dust was subsequently accelerated by gas drag. About a week after the impact event, the dust cloud had dispersed due to its expansion and the force exerted by solar radiation pressure. The light curve of the dust cloud contains information about its formation and evolution: The time scale of production of impact created material can be derived from the time scale of the brightness increase. The velocity distribution of the cloud is indicative of acceleration processes in the inner coma of the comet. Finally, the abundance of large dust particles created by the impact can be estimated from the brightness of the cloud several days after the impact when small particles have been pushed away by radiation pressure. Here we analyze data obtained by the Narrow Angle Camera (NAC) of OSIRIS onboard the ESA spacecraft Rosetta to derive the velocity distribution of the dust cloud from an inversion of its light curve. OSIRIS observed comet Tempel 1 near-continuously for more than two weeks around the impact. A model of the expansion of the ejecta is compared to the light curve seen by the NAC. We derive a broad velocity distribution of the dust particles, which peaks at around 225 m/s, in good agreement with published estimates. The velocities suggest that the impact ejecta were quickly accelerated by gas in the cometary coma. We will discuss implications of our results for the evolution of the dust cloud during the first hours after the impact and provide estimates of the released dust mass. OSIRIS is funded by the agencies ASI, CNES, DLR, the Spanish Space Program (Ministerio de Educación y Ciencia), SNSB, and ESA.

    1. The Gemini NICI Planet-Finding Campaign: The Companion Detection Pipeline

      NASA Astrophysics Data System (ADS)

      Wahhaj, Zahed; Liu, Michael C.; Biller, Beth A.; Nielsen, Eric L.; Close, Laird M.; Hayward, Thomas L.; Hartung, Markus; Chun, Mark; Ftaclas, Christ; Toomey, Douglas W.

      2013-12-01

      We present high-contrast image processing techniques used by the Gemini NICI Planet-Finding Campaign to detect faint companions to bright stars. The Near-Infrared Coronographic Imager (NICI) is an adaptive optics instrument installed on the 8 m Gemini South telescope, capable of angular and spectral difference imaging and specifically designed to image exoplanets. The Campaign data pipeline achieves median contrasts of 12.6 mag at 0.''5 and 14.4 mag at 1'' separation, for a sample of 45 stars (V = 4.3-13.9 mag) from the early phase of the campaign. We also present a novel approach to calculating contrast curves for companion detection based on 95% completeness in the recovery of artificial companions injected into the raw data, while accounting for the false-positive rate. We use this technique to select the image processing algorithms that are more successful at recovering faint simulated point sources. We compare our pipeline to the performance of the Locally Optimized Combination of Images (LOCI) algorithm for NICI data and do not find significant improvement with LOCI. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    2. Haffner 16: A Young Moving Group in the Making

      NASA Astrophysics Data System (ADS)

      Davidge, T. J.; Carrasco, Eleazar R.; Winge, Claudia; Pessev, Peter; Neichel, Benoit; Vidal, Fabrice; Rigaut, Francois

      2013-10-01

      The photometric properties of main sequence (MS) and pre-main sequence (PMS) stars in the young cluster Haffner 16 are examined using images recorded with the Gemini South Adaptive Optics Imager (GSAOI) and corrected for atmospheric blurring by the Gemini Multi-Conjugate Adapative Optics System (GeMS). A rich population of PMS stars is identified, and comparisons with isochrones suggest an age lsim10 Myr, assuming a distance modulus of 13.5 (D = 5 kpc). This age is consistent with that estimated from the lower cutoff of the MS on the K-band luminosity function and is ~2 Myr younger than the age found from bright MS stars at visible wavelengths. When compared with the solar neighborhood, Haffner 16 is roughly a factor of 2 deficient in objects with subsolar masses. PMS objects in the cluster are also more uniformly distributed on the sky than bright MS stars. It is suggested that Haffner 16 is dynamically evolved and that it is shedding protostars with subsolar masses. Young low mass clusters like Haffner 16 are one possible source of PMS stars in the field. The cluster will probably evolve on time scales of ~100-1000 Myr into a diffuse moving group with a mass function that is very different from that which prevailed early in its life. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    3. Analysis of soil images applying Laplacian Pyramidal techniques

      NASA Astrophysics Data System (ADS)

      Ballesteros, F.; de Castro, J.; Tarquis, A. M.; Méndez, A.

      2012-04-01

      The Laplacian pyramid is a technique for image encoding in which local operators of many scales but identical shape are the basis functions. Our work describes some properties of the filters of the Laplacian pyramid. Specially, we pay attention to Gaussian and fractal behaviour of these filters, and we determine the normal and fractal ranges in the case of single parameter filters, while studying the influence of these filters in soil image processing. One usual property of any image is that neighboring pixels are highly correlated. This property makes inefficient to represent the image directly in terms of the pixel values, because most of the encoded information would be redundant. Burt and Adelson designed a technique, named Laplacian pyramid, for removing image correlation which combines features of predictive and transform methods. This technique is non causal, and its computations are simple and local. The predicted value for each pixel is computed as a local weighted average, using a unimodal weighting function centred on the pixel itself. Pyramid construction is equivalent to convolving the original image with a set of weighting functions determined by a parameter that defines the filter. According to the parameter values, these filters have a behaviour that goes from the Gaussian shape to the fractal. Previous works only analyze Gaussian filters, but we determine the Gaussian and fractal intervals and study the energy of the Laplacian pyramid images according to the filter types. The different behaviour, qualitatively, involves a significant change in statistical characteristics at different levels of iteration, especially the fractal case, which can highlight specific information from the images. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    4. A Dark Spot on a Massive White Dwarf

      NASA Astrophysics Data System (ADS)

      Kilic, Mukremin; Gianninas, Alexandros; Bell, Keaton J.; Curd, Brandon; Brown, Warren R.; Hermes, J. J.; Dufour, Patrick; Wisniewski, John P.; Winget, D. E.; Winget, K. I.

      2015-12-01

      We present the serendipitous discovery of eclipse-like events around the massive white dwarf SDSS J152934.98+292801.9 (hereafter J1529+2928). We selected J1529+2928 for time-series photometry based on its spectroscopic temperature and surface gravity, which place it near the ZZ Ceti instability strip. Instead of pulsations, we detect photometric dips from this white dwarf every 38 minutes. Follow-up optical spectroscopy observations with Gemini reveal no significant radial velocity variations, ruling out stellar and brown dwarf companions. A disintegrating planet around this white dwarf cannot explain the observed light curves in different filters. Given the short period, the source of the photometric dips must be a dark spot that comes into view every 38 minutes due to the rotation of the white dwarf. Our optical spectroscopy does not show any evidence of Zeeman splitting of the Balmer lines, limiting the magnetic field strength to B < 70 kG. Since up to 15% of white dwarfs display kG magnetic fields, such eclipse-like events should be common around white dwarfs. We discuss the potential implications of this discovery on transient surveys targeting white dwarfs, like the K2 mission and the Large Synoptic Survey Telescope. This work is based on observations obtained at the Gemini Observatory, McDonald Observatory, and the Apache Point Observatory 3.5-m telescope. The latter is owned and operated by the Astrophysical Research Consortium. Gemini Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    5. Subsystems in Nearby Solar-type Wide Binaries

      NASA Astrophysics Data System (ADS)

      Tokovinin, Andrei; Hartung, Markus; Hayward, Thomas L.

      2010-08-01

      We conducted a deep survey of resolved subsystems among wide binaries with solar-type components within 67 pc of the Sun. Images of 61 stars in the K and H bands were obtained with the Near-Infrared Coronagraphic Imager adaptive-optics instrument on the 8 m Gemini-South telescope. Our maximum detectable magnitude difference is about 5 mag and 7.8 mag at 0farcs15 and 0farcs9 separations, respectively. This enables a complete census of subsystems with stellar companions in the projected separation range from 5 to 100 AU. Out of seven such companions found in our sample, only one was previously known. We determine that the fraction of subsystems with projected separations above 5 AU is 0.12 ± 0.04 and that the distribution of their mass ratio is flat, with a power-law index of 0.2 ± 0.5. Comparing this with the properties of closer spectroscopic subsystems (separations below 1 AU), it appears that the mass-ratio distribution does not depend on the separation. The frequency of subsystems in the separation ranges below 1 AU and between 5 and 100 AU is similar, about 0.15. Unbiased statistics of multiplicity higher than 2, advanced by this work, provide constraints on star formation theory. Based on observations obtained at the Gemini Observatory (Program ID GS-2009B-Q-49), which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    6. Time Delay Measurements for the Cluster-lensed Sextuple Quasar SDSS J2222+2745

      NASA Astrophysics Data System (ADS)

      Dahle, H.; Gladders, M. D.; Sharon, K.; Bayliss, M. B.; Rigby, J. R.

      2015-11-01

      We report first results from an ongoing monitoring campaign to measure time delays between the six images of the quasar SDSS J2222+2745, gravitationally lensed by a galaxy cluster. The time delay between A and B, the two most highly magnified images, is measured to be {τ }{{AB}}=47.7+/- 6.0 days (95% confidence interval), consistent with previous model predictions for this lens system. The strong intrinsic variability of the quasar also allows us to derive a time delay value of {τ }{{CA}}=722+/- 24 days between image C and A, in spite of modest overlap between their light curves in the current data set. Image C, which is predicted to lead all the other lensed quasar images, has undergone a sharp, monotonic flux increase of 60%–75% during 2014. A corresponding brightening is firmly predicted to occur in images A and B during 2016. The amplitude of this rise indicates that time delays involving all six known images in this system, including those of the demagnified central images D–F, will be obtainable from further ground-based monitoring of this system during the next few years. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, and including observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnologi´a e Innovación Productiva (Argentina).

    7. Integrating the GalileoScope into Successful Outreach Programming

      NASA Astrophysics Data System (ADS)

      Michaud, Peter D.; Slater, S.; Goldstein, J.; Harvey, J.; Garcia, A.

      2010-01-01

      Since 2004, the Gemini Observatory’s week-long Journey Through the Universe (JTtU) program has successfully shared the excitement of scientific research with teachers, students and the public on Hawaii’s Big Island. Based on the national JTtU program started in 1999, the Hawai‘i version reaches an average of 7,000 students annually and each year features a different theme shared with a diverse set of learners. In 2010, the theme includes the integration of the GalileoScope-produced as a keystone project for the International Year of Astronomy. In preparation, a pilot teacher workshop (held in October 2009) introduced local island teachers to the GalileoScope and a 128-page educator’s activity resource book coordinated by the University of Wyoming. Response from this initial teacher’s workshop has been strong and evaluations plus follow-up actions by participating teachers illustrate that the integration of the GalileoScope has been successful based upon this diverse sample. Integrating GalileoScopes into Chilean schools in 2010 is also underway at Gemini South. This program will solicit informal proposals from educators who wish to use the telescopes in classrooms and a Spanish version of the teacher resource book is planned. The authors conclude that integration of the GalileoScope into an existing outreach program is an effective way to keep content fresh, relevant and engaging for both educators and students. This initiative is funded by Gemini Observatory outreach program. The Gemini Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (US), the Science and Technology Facilities Council (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva

    8. Direct Evidence for an Enhancement of Helium in Giant Stars in Omega Centauri

      NASA Astrophysics Data System (ADS)

      Dupree, A. K.; Strader, Jay; Smith, Graeme H.

      2011-02-01

      The double main sequence identified in the globular cluster Omega Centauri has been interpreted using isochrones to indicate a large variation in the abundance of helium. If true, a helium enhancement carries strong implications for the chemical and stellar evolutionary history of this cluster. However, only indirect measures currently support this conjecture. We report the discovery of a variation in the line strength of the near-infrared He I 10830 Å transition in 12 similar red giants in Omega Centauri observed with PHOENIX on Gemini-S. Abundances of these stars derived from Magellan/MIKE spectra taken at the Las Campanas Observatory show that the helium transition is not detected in the most metal-poor population ([Fe/H] < -1.8), yet is present in the majority of stars with [Fe/H] >= -1.8. These observations give the first direct evidence for an enhancement of helium in Omega Centauri. The appearance of helium appears better correlated with increased [Al/Fe] and [Na/Fe] abundances than as a function of [Fe/H], giving observational support to the presence of high-temperature H burning in a prior generation of stars. Data presented herein were obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). This paper also includes spectra gathered with the 6.5 m Magellan Telescope/CLAY located at Las Campanas Observatory, Chile.

    9. Gemini Frontier Fields: Wide-field Adaptive Optics Ks-band Imaging of the Galaxy Clusters MACS J0416.1-2403 and Abell 2744

      NASA Astrophysics Data System (ADS)

      Schirmer, M.; Carrasco, E. R.; Pessev, P.; Garrel, V.; Winge, C.; Neichel, B.; Vidal, F.

      2015-04-01

      We have observed two of the six Frontier Fields galaxy clusters, MACS J0416.1-2403 and Abell 2744, using the Gemini Multi-Conjugate Adaptive Optics System (GeMS) and the Gemini South Adaptive Optics Imager (GSAOI). With 0.″ 08-0.″ 10 FWHM our data are nearly diffraction-limited over a 100\\prime\\prime × 100\\prime\\prime wide area. GeMS/GSAOI complements the Hubble Space Telescope (HST) redwards of 1.6 μm with twice the angular resolution. We reach a 5σ depth of {{K}s}˜ 25.6 mag (AB) for compact sources. In this paper, we describe the observations, data processing, and initial public data release. We provide fully calibrated, co-added images matching the native GSAOI pixel scale as well as the larger plate scales of the HST release, adding to the legacy value of the Frontier Fields. Our work demonstrates that even for fields at high galactic latitude where natural guide stars are rare, current multi-conjugated adaptive optics technology at 8 m telescopes has opened a new window on the distant universe. Observations of a third Frontier Field, Abell 370, are planned. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). Based on observations made with ESO Telescopes at the La Silla and Paranal Observatories, Chile.

    10. Robust regression applied to fractal/multifractal analysis.

      NASA Astrophysics Data System (ADS)

      Portilla, F.; Valencia, J. L.; Tarquis, A. M.; Saa-Requejo, A.

      2012-04-01

      Fractal and multifractal are concepts that have grown increasingly popular in recent years in the soil analysis, along with the development of fractal models. One of the common steps is to calculate the slope of a linear fit commonly using least squares method. This shouldn't be a special problem, however, in many situations using experimental data the researcher has to select the range of scales at which is going to work neglecting the rest of points to achieve the best linearity that in this type of analysis is necessary. Robust regression is a form of regression analysis designed to circumvent some limitations of traditional parametric and non-parametric methods. In this method we don't have to assume that the outlier point is simply an extreme observation drawn from the tail of a normal distribution not compromising the validity of the regression results. In this work we have evaluated the capacity of robust regression to select the points in the experimental data used trying to avoid subjective choices. Based on this analysis we have developed a new work methodology that implies two basic steps: • Evaluation of the improvement of linear fitting when consecutive points are eliminated based on R p-value. In this way we consider the implications of reducing the number of points. • Evaluation of the significance of slope difference between fitting with the two extremes points and fitted with the available points. We compare the results applying this methodology and the common used least squares one. The data selected for these comparisons are coming from experimental soil roughness transect and simulated based on middle point displacement method adding tendencies and noise. The results are discussed indicating the advantages and disadvantages of each methodology. Acknowledgements Funding provided by CEIGRAM (Research Centre for the Management of Agricultural and Environmental Risks) and by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no

    11. Origin Of The Near-earth Asteroid Phaethon And The Geminids Meteor Shower

      NASA Astrophysics Data System (ADS)

      de Leon, Julia; Campins, H.; Tsiganis, K.; Morbidelli, A.; Licandro, J.

      2010-10-01

      Asteroid (3200) Phaethon is a remarkable Near Earth Asteroid (NEA). It was the first asteroid associated with a meteor shower, namely the Geminid stream1. Phaethon's unusual orbit has a high inclination and a very low perihelion distance (0.14 AU). Its reflectance spectrum suggests a connection with primitive meteorites, best fitting with CI/CM carbonaceous chondrites2, aqueously altered and rich in hydrated silicates. However, its origin is not well determined. Recent studies suggest a connection with the population of main-belt comets3, classifying Phaethon as an activated asteroid. Here we show that the most likely source of Phaethon and the Geminids is the asteroid (2) Pallas, one of the largest asteroids in the main belt, which is surrounded by a collisional family, containing several Phaethon-sized objects. Pallas’ highly inclined orbit and surface composition, also primitive and with evidence of hydration4, support this connection. Our analysis reveals a striking similarity between Phaethon's visual spectrum and those of Pallas family members. Moreover, our numerical simulations show the existence of a robust dynamical pathway, connecting the orbital neighborhood of Pallas with that of Phaethon. In this respect, the Pallas family may constitute a source of primitive NEAs. (The author gratefully acknowledges support from the Spanish "Ministerio de Ciencia e Innovación" projects AYA2005-07808-C03-02 and AYA2008-06202-C03-02.) References 1. Whipple, F. L. 1983, IAU Circular, 3881 2. Licandro, J., Campins, H., Mothe-Diniz, T., Pinilla-Alonso, N. & de Leon, J. 2007, Astron. Astrophys. 461, 751-757 3. Hsieh, H. H., & Jewitt, D. 2006, Science, 312, 561-563 4. Rivkin, A. S., Howell, E. S., Vilas, F. & Lebofsky, L. A. in Asteroids III (eds Bottke, W. F., Cellino, A., Paolicchi, P. & Binzel, R. P.) 235-253 (Univ. Arizona Press, 2002).

    12. Variation of soil surface roughness under simulated rainfall

      NASA Astrophysics Data System (ADS)

      Tarquis, A. M.; Saa-Requejo, A.; Valencia, J. L.; Moratiel, R.; Paz-Gonzalez, A.

      2012-04-01

      Soil surface micro-topography or roughness (SSR) defines the physical boundary between overland flow and soil. Due to its unique position, soil roughness potentially affects surface processes such as infiltration, flow routing, erosion and sedimentation. Thus the decay of SSR under different rainfall intensities is of most interest in soil erosion. While some authors have chosen exponent function of cumulative rainfall to describe the decay of SSR, others have used the kinetic energy of rainfall. SSR at the field level is an easy visually perceptible notion, but difficult to describe numerically. In this study we didn't use pin-meter or laser techniques to quantify SSR. Percentage of micro-topographic shadows, under fixed sunlight conditions, has been applied based on former works that proved it is an easy and reliable method to estimate SSR. Two experimental plots, of 1m x 1m, were subjected to successive simulated rainfall events with an intensity of 67 mm/h and a height of 2 m. Both plots were a harrowed plot with an oriented roughness and 6% slope. Images were obtained each 15 minutes of rainfall with an incident angle of light of 45° approximately. The image was acquired by an OLYMPUS X-925, having a size of 2976x3968 pixels and corresponding to an area of 75 cm x 100 cm. For denoising process, the image was cropped to 590x800 pixels and for image binarization Indicator Kriging (IK) method was used. Comparisons of both plots respect to SSR evolution, runoff accumulation and shadows morphology are showed. Acknowledgements Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    13. Gemini-IFU Spectroscopy of HH 111

      NASA Astrophysics Data System (ADS)

      Cerqueira, A. H.; Vasconcelos, M. J.; Raga, A. C.; Feitosa, J.; Plana, H.

      2015-03-01

      We present new optical observations of the Herbig-Haro (HH) 111 jet using the Gemini Multi Object Spectrograph in its Integral Field Unit mode. Eight fields of 5\\prime\\prime × 3\\buildrel{\\prime\\prime}\\over{.} 5 have been positioned along and across the HH 111 jet, covering the spatial region from knot E to L in HH 111 (namely, knots E, F, G, H, J, K, and L). We present images and velocity channel maps for the [O i] 6300+6360, Hα, [N ii] 6548+6583, and [S ii] 6716+6730 lines, as well as for the [S ii] 6716/6730 line ratio. We find that the HH 111 jet has an inner region with lower excitation and higher radial velocity, surrounded by a broader region of higher excitation and lower radial velocity. Also, we find higher electron densities at lower radial velocities. These results imply that the HH 111 jet has a fast, axial region with lower velocity shocks surrounded by a lower velocity sheath with higher velocity shocks. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    14. Star formation in H I tails: HCG 92, HCG 100 and six interacting systems

      NASA Astrophysics Data System (ADS)

      de Mello, D. F.; Urrutia-Viscarra, F.; Mendes de Oliveira, C.; Torres-Flores, S.; Carrasco, E. R.; Cypriano, E.

      2012-11-01

      We present new Gemini spectra of 14 new objects found within the H I tails of Hickson Compact Groups (HCGs) 92 and 100. Nine of them are Galaxy Evolution Explorer (GALEX) far-ultraviolet (FUV) and near-ultraviolet (NUV) sources. The spectra confirm that these objects are members of the compact groups and have metallicities close to solar, with an average value of 12+log(O/H) ˜ 8.5. They have average FUV luminosities 7 × 1040 erg s-1 and very young ages (<100 Myr), and two of them resemble tidal dwarf galaxy (TDG) candidates. We suggest that they were created within gas clouds that were ejected during galaxy-galaxy interactions into the intergalactic medium, which would explain the high metallicities of the objects, inherited from the parent galaxies from which the gas originated. We conduct a search for similar objects in six interacting systems with extended H I tails: NGC 2623, NGC 3079, NGC 3359, NGC 3627, NGC 3718 and NGC 4656. We found 35 ultraviolet (UV) sources with ages < 100 Myr; however, most of them are on average less luminous/massive than the UV sources found around HCG 92 and HCG 100. We speculate that this might be an environmental effect and that compact groups of galaxies are more favourable to TDG formation than other interacting systems. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation (NSF) on behalf of the Gemini partnership: the NSF (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnologia e Innovacion Productiva (Argentina) - Observing run ID: GN-2003A-Q-53 and GN-2007B-Q-87.

    15. Penetrating the Homunculus—Near-Infrared Adaptive Optics Images of Eta Carinae

      NASA Astrophysics Data System (ADS)

      Artigau, Étienne; Martin, John C.; Humphreys, Roberta M.; Davidson, Kris; Chesneau, Olivier; Smith, Nathan

      2011-06-01

      Near-infrared adaptive optics imaging with the Near-Infrared Coronagraphic Imager (NICI) and NaCO reveal what appears to be a three-winged or lobed pattern, the "butterfly nebula," outlined by bright Brγ and H2 emission and light scattered by dust. In contrast, the [Fe II] emission does not follow the outline of the wings, but shows an extended bipolar distribution which is tracing the Little Homunculus ejected in η Car's second or lesser eruption in the 1890s. Proper motions measured from the combined NICI and NaCO images together with radial velocities show that the knots and filaments that define the bright rims of the butterfly were ejected at two different epochs corresponding approximately to the great eruption and the second eruption. Most of the material is spatially distributed 10°-20° above and below the equatorial plane apparently behind the Little Homunculus and the larger SE lobe. The equatorial debris either has a wide opening angle or the clumps were ejected at different latitudes relative to the plane. The butterfly is not a coherent physical structure or equatorial torus but spatially separate clumps and filaments ejected at different times, and now 2000-4000 AU from the star. Based on observations obtained at the Gemini Observatory (program ID: GS-2008B-DD-6), which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    16. New objects with the B[e] phenomenon in the Large Magellanic Cloud

      NASA Astrophysics Data System (ADS)

      Levato, H.; Miroshnichenko, A. S.; Saffe, C.

      2014-08-01

      Aims: The study is aimed at discovering new objects with the B[e] phenomenon in the Large Magellanic Cloud. Methods: We report medium-resolution optical spectroscopic observations of two newly found (ARDB 54 and NOMAD 0181-0125572) and two previously known (Hen S-59 and Hen S-137) supergiants with the B[e] phenomenon in the Large Magellanic Cloud. The observations were obtained with the GMOS spectrograph at the southern Gemini telescope. Results: The optical spectra and the fundamental parameters of ARDB 54 and NOMAD 0181-0125572 are presented for the first time. We found that the Balmer line profiles of Hen S-59 and Hen S-137 were different from those observed in their spectra nearly 20 years ago. We suggest a higher effective temperature and luminosity for both objects. With the new fundamental parameters, the lowest luminosity for known supergiants with the B[e] phenomenon in the Magellanic Clouds is higher that previously thought (log L/L⊙ ~ 4.5 instead of 4.0). The object Hen S-59 may be a binary system based on its UV excess, variable B - V color-index and radial velocity of emission lines, and periodically variable I-band brightness. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovacão (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    17. Additional Spitzer IRS Spectroscopy of Three Intermediate Polars: The Detection of a Mid-infrared Synchrotron Flare from V1223 Sagittarii

      NASA Astrophysics Data System (ADS)

      Harrison, Thomas E.; Bornak, Jillian; Rupen, Michael P.; Howell, Steve B.

      2010-02-01

      We present new Spitzer Infrared Spectrograph (IRS) observations of three intermediate polars: V1223 Sgr, EX Hya, and V603 Aql. We detected a strong, fading flare event from V1223 Sgr. During this event, the flux declined by a factor of 13 in 30 minutes. Given the similarity in the slope of its mid-infrared spectrum during this event to that of AE Aqr, we suggest that this event was caused by transient synchrotron emission. Thus, V1223 Sgr becomes the third cataclysmic variable known to be a synchrotron source. We were unable to confirm the mid-infrared excess noted by Harrison et al. (Paper I) for EX Hya, suggesting that this object is either not a synchrotron source, or is slightly variable. Due to a very high background, V603 Aql was not detected in the long-wavelength regions accessible to the IRS. Given the recent detection of SS Cygni at radio wavelengths during outburst, we extract archival Spitzer IRS spectra for this source obtained during two successive maxima. These spectra do not show a strong excess, but without simultaneous data at shorter wavelengths, it is not possible to determine whether there is any contribution to the mid-infrared fluxes from a synchrotron jet. Includes observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    18. GeMS in the Outer Galaxy: Near-infrared Imaging of Three Young Clusters at Large Galactic Radii

      NASA Astrophysics Data System (ADS)

      Davidge, T. J.

      2014-02-01

      Images recorded with the Gemini South Adaptive Optics Imager (GSAOI) and corrected for atmospheric seeing by the Gemini Multi-conjugate Adaptive Optics System are used to investigate the stellar contents of the young outer Galactic disk clusters Haffner 17, NGC 2401, and NGC 3105. Ages estimated from the faint end of the main sequence (MS) and the ridgeline of the pre-main sequence on the (K, J - K) color-magnitude diagrams are consistent with published values that are based on the MS turnoff, with the GSAOI data favoring the younger end of the age range for NGC 2401 in the literature. The mass function (MF) of NGC 2401 is similar to that in the solar neighborhood, and stars spanning a wide range of masses in this cluster have similar clustering properties on the sky. It is concluded that NGC 2401 is not evolved dynamically. In contrast, the MF of Haffner 17 differs significantly from that in the solar neighborhood over all masses covered by these data, while the MF of NGC 3105 is deficient in objects with sub-solar masses when compared with the solar neighborhood. Low-mass objects in Haffner 17 and NGC 3105 are also more uniformly distributed on the sky than brighter, more massive, MS stars. This is consistent with both clusters having experienced significant dynamical evolution. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    19. The sudden appearance of CO emission in LHA 115-S 65

      NASA Astrophysics Data System (ADS)

      Oksala, M. E.; Kraus, M.; Arias, M. L.; Borges Fernandes, M.; Cidale, L.; Muratore, M. F.; Curé, M.

      2012-10-01

      Molecular emission has been detected in several Magellanic Cloud B[e] supergiants. In this Letter, we report on the detection of CO band head emission in the B[e] supergiant LHA 115-S 65, and present a K-band near-infrared spectrum obtained with the Spectrograph for INtegral Field Observation in the Near-Infrared (SINFONI; R= 4500) on the ESO VLT UT4 telescope. The observed molecular band head emission in S65 is quite surprising in the light of a previous non-detection by McGregor, Hyland & McGinn, as well as a high-resolution (R= 50 000) Gemini/Phoenix spectrum of this star taken nine months earlier showing no emission. Based on analysis of the optical spectrum by Kraus, Borges Fernandes & de Araújo, we suspect that the sudden appearance of molecular emission could be due to density build-up in an outflowing viscous disc, as seen for Be stars. This new discovery, combined with variability in two other similar evolved massive stars, indicates an evolutionary link between B[e] supergiants and luminous blue variables. Based on observations obtained with ESO telescopes at the La Silla Paranal Observatory under programme ID 088.D-044 and at the Gemini Observatory which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (USA), the Science and Technology Facilities Council (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), under programme ID GS-2010B-Q-31.

    20. Frequency and Intensity of drought events over Ebro River basin

      NASA Astrophysics Data System (ADS)

      Valencia, J. L.; Saa-Requejo, A.; Gascó, J. M.; Tarquis, A. M.

      2012-04-01

      Lately, several researchers have pointed out that climate change is expected to increase temperatures and lower rainfall in Mediterranean regions, simultaneously increasing the intensity of extreme rainfall events. These changes could have consequences regarding rainfall regime, erosion, sediment transport and water quality, soil management, and new designs in diversion ditches. Climate change is expected to result in increasingly unpredictable and variable rainfall, in amount and timing, changing seasonal patterns and increasing the frequency of extreme weather events. Consequently, the evolution of frequency and intensity of drought periods is of most important as in agro-ecosystems many processes will be affected by them. Realising the complex and important consequences of an increasing frequency of extreme droughts at the Ebro River basin, our aim is to study the evolution of drought events at this site statistically, with emphasis on the occurrence and intensity of them. For this purpose, fourteen meteorological stations were selected based on the length of the rainfall series and the climatic classification to obtain a representative untreated dataset from the river basin. Daily rainfall series from 1957 to 2002 were obtained from each meteorological station and no-rain period frequency as the consecutive numbers of days were extracted. Based on this data, we study changes in the probability distribution in several sub-periods. Moreover we used the Standardized Precipitation Index (SPI) for identification of drought events in a year scale and then we use this index to fit log-linear models to the contingency tables between the SPI index and the sub-periods, this adjusted is carried out with the help of ANOVA inference. Funding provided by ENESA, under projects P030225764 and P070225564, and by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    1. Observations Of The LCROSS Impact With NIFS On The Gemini North Telescope

      NASA Astrophysics Data System (ADS)

      Roth, Katherine; Stephens, A. W.; Trujillo, C. A.; McDermid, R. M.; Woodward, C. E.; Walls, B. D.; Coulson, D. M.; Matulonis, A. C.; Ball, J. G.; Wooden, D. H.

      2010-01-01

      The Lunar CRater Observation and Sensing Satellite (LCROSS) Centaur rocket impacted a permanently shadowed crater near the south pole of the Moon at 11:31 UTC 2009 October 09. Gemini, one of several telescopes in a coordinated network observing the impact, conducted observations using NIFS to obtain 3D K-band imaging spectroscopy to detect water ice in the ejected plume of material. The spectral slope of the NIFS data can constrain the grain size and height distribution as the plume evolves, measuring the total mass and the water ice concentration in the plume. These observations provided an engineering challenge for Gemini, including the need to track non-sidereal with constantly changing track rates and guide on small bright moon craters, in order to keep the impact site within the NIFS field-of-view. High quality images taken by GMOS-N, NIRI and the acquisition camera during engineering periods at specific lunar libration and illumination were also used by the LCROSS ground based observing team to supplement slit positioning and offset plans for other ground based observatories. LCROSS mission support and engineering has resulted in improved telescope functionality for non-sidereal targets, including the ability to upload and import target ephemerides directly into the TCS, starting in semester 2010B. In this poster we present the engineering results and observing improvements which will facilitate enhanced user capabilities of the Gemini telescopes arising from the intensive LCROSS support challenge. Gemini Observatory is operated by AURA, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the NSF (United States), the STFC (United Kingdom), the NRC (Canada), CONICYT (Chile), the ARC (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). In part this research was supported by NASA through contracts to SWRI and NSF grant AST-0706980 to the U

    2. Post-maximum Near-infrared Spectra of SN 2014J: A Search for Interaction Signatures

      NASA Astrophysics Data System (ADS)

      Sand, D. J.; Hsiao, E. Y.; Banerjee, D. P. K.; Marion, G. H.; Diamond, T. R.; Joshi, V.; Parrent, J. T.; Phillips, M. M.; Stritzinger, M. D.; Venkataraman, V.

      2016-05-01

      We present near-infrared (NIR) spectroscopic and photometric observations of the nearby Type Ia SN 2014J. The 17 NIR spectra span epochs from +15.3 to +92.5 days after B-band maximum light, while the {{JHK}}s photometry include epochs from ‑10 to +71 days. These data are used to constrain the progenitor system of SN 2014J utilizing the Paβ line, following recent suggestions that this phase period and the NIR in particular are excellent for constraining the amount of swept-up hydrogen-rich material associated with a non-degenerate companion star. We find no evidence for Paβ emission lines in our post-maximum spectra, with a rough hydrogen mass limit of ≲ 0.1 M ⊙, which is consistent with previous limits in SN 2014J from late-time optical spectra of the Hα line. Nonetheless, the growing data set of high-quality NIR spectra holds the promise of very useful hydrogen constraints. Based on observations obtained at the Gemini Observatory under program GN-2014A-Q-8 (PI: Sand). Gemini is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil).

    3. The Gemini NICI Planet-finding Campaign: Discovery of a Close Substellar Companion to the Young Debris Disk Star PZ Tel

      NASA Astrophysics Data System (ADS)

      Biller, Beth A.; Liu, Michael C.; Wahhaj, Zahed; Nielsen, Eric L.; Close, Laird M.; Dupuy, Trent J.; Hayward, Thomas L.; Burrows, Adam; Chun, Mark; Ftaclas, Christ; Clarke, Fraser; Hartung, Markus; Males, Jared; Reid, I. Neill; Shkolnik, Evgenya L.; Skemer, Andrew; Tecza, Matthias; Thatte, Niranjan; Alencar, Silvia H. P.; Artymowicz, Pawel; Boss, Alan; de Gouveia Dal Pino, Elisabete; Gregorio-Hetem, Jane; Ida, Shigeru; Kuchner, Marc J.; Lin, Douglas; Toomey, Douglas

      2010-09-01

      We report the discovery of a tight substellar companion to the young solar analog PZ Tel, a member of the β Pic moving group observed with high-contrast adaptive optics imaging as part of the Gemini Near-Infrared Coronagraphic Imager Planet-Finding Campaign. The companion was detected at a projected separation of 16.4 ± 1.0 AU (0farcs33 ± 0farcs01) in 2009 April. Second-epoch observations in 2010 May demonstrate that the companion is physically associated and shows significant orbital motion. Monte Carlo modeling constrains the orbit of PZ Tel B to eccentricities >0.6. The near-IR colors of PZ Tel B indicate a spectral type of M7 ± 2 and thus this object will be a new benchmark companion for studies of ultracool, low-gravity photospheres. Adopting an age of 12+8 -4 Myr for the system, we estimate a mass of 36 ± 6 M Jup based on the Lyon/DUSTY evolutionary models. PZ Tel B is one of the few young substellar companions directly imaged at orbital separations similar to those of giant planets in our own solar system. Additionally, the primary star PZ Tel A shows a 70 μm emission excess, evidence for a significant quantity of circumstellar dust that has not been disrupted by the orbital motion of the companion. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    4. Witnessing Gas Mixing in the Metal Distribution of the Hickson Compact Group HCG 31

      NASA Astrophysics Data System (ADS)

      Torres-Flores, S.; Mendes de Oliveira, C.; Amram, P.; Alfaro-Cuello, M.; Carrasco, E. R.; de Mello, D. F.

      2015-01-01

      We present for the first time direct evidence that in a merger of disk galaxies, the pre-existing central metallicities will mix as a result of gas being transported in the merger interface region along the line that joins the two coalescing nuclei. This is shown using detailed two-dimensional kinematics as well as metallicity measurements for the nearby ongoing merger in the center of the compact group HCG 31. We focus on the emission line gas, which is extensive in the system. The two coalescing cores display similar oxygen abundances. While in between the two nuclei, the metallicity changes smoothly from one nucleus to the other indicating a mix of metals in this region, which is confirmed by the high-resolution Hα kinematics (R = 45,900). This nearby system is especially important because it involves the merging of two fairly low-mass and clumpy galaxies (LMC-like galaxies), making it an important system for comparison with high-redshift galaxies. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina) - Observing run: GS-2012B-Q-60.

    5. The Abundance Scatter in M33 from H II Regions: Is There Any Evidence for Azimuthal Metallicity Variations?

      NASA Astrophysics Data System (ADS)

      Bresolin, Fabio

      2011-04-01

      Optical spectra of 25 H II regions in the inner 2 kpc of the M33 disk have been obtained with the Gemini Multi-Object Spectrograph at the Gemini North telescope. The oxygen abundance gradient measured from the detection of the [O III] λ4363 auroral line displays a scatter of approximately 0.06 dex, a much smaller value than recently reported by Rosolowsky & Simon in this galaxy. The analysis of the abundances for a large sample of H II regions derived from the R 23 strong-line indicator confirms that the scatter is small over the full disk of M33, consistent with the measuring uncertainties, and comparable to what is observed in other spiral galaxies. No evidence is therefore found for significant azimuthal variations in the present-day metallicity of the interstellar medium in this galaxy on spatial scales from ~100 pc to a few kpc. A considerable fraction of M33 H II regions with auroral line detections show spectral features revealing sources of hard ionizing radiation (such as He II emission and large [Ne III], [O III] line fluxes). Since R 23 is shown to severely underestimate the oxygen abundances in such cases, care must be taken in chemical abundance studies of extragalactic H II regions based on this strong-line indicator. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    6. Revisiting the Abundance Gradient in the Maser Host Galaxy NGC 4258

      NASA Astrophysics Data System (ADS)

      Bresolin, Fabio

      2011-03-01

      New spectroscopic observations of 36 H II regions in NGC 4258 obtained with the Gemini telescope are combined with existing data from the literature to measure the radial oxygen abundance gradient in this galaxy. The [O III]λ4363 auroral line was detected in four of the outermost targets (17-22 kpc from the galaxy center), allowing a determination of the electron temperature Te of the ionized gas. From the use of different calibrations of the R 23 abundance indicator, an oxygen abundance gradient of approximately -0.012 ± 0.002 dex kpc-1 is derived. Such a shallow gradient, combined with the difference in the distance moduli measured from the Cepheid period-luminosity relation by Macri et al. between two distinct fields in NGC 4258, would yield an unrealistically strong effect of metallicity on the Cepheid distances. This strengthens the suggestion that systematic biases might affect the Cepheid distance of the outer field. Evidence for a similar effect in the differential study of M33 by Scowcroft et al. is presented. A revision of the transformation between strong-line and Te -based abundances in Cepheid-host galaxies is discussed. In the Te abundance scale, the oxygen abundance of the inner field of NGC 4258 is found to be comparable with the LMC value. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    7. Simultaneous K- and L-band Spectroscopy of Be Stars: Circumstellar Envelope Properties from Hydrogen Emission Lines

      NASA Astrophysics Data System (ADS)

      Granada, A.; Arias, M. L.; Cidale, L. S.

      2010-05-01

      We present medium-resolution K- and L-band spectra of a sample of eight Be stars, obtained with Gemini/NIRI. The IR K and L bands contain many lines of different hydrogen series that are used as a diagnosis to the physical conditions in the circumstellar environments. We make an analysis on the optical depths of the line-forming regions based on the intensity ratios of Pfγ and Brα lines, the behavior of Humphreys' series, and the fluxes of Brα and Brγ lines. All our targets show spectroscopic and photometric long-term variability; thus, time-resolved K- and L-band spectroscopy is an ideal tool for studying the structure and evolution of the innermost regions of the envelope and to test models on the disk-forming mechanism. We note that the instrumental configuration used allowed us to obtain good quality IR observations and to take profit of Gemini band 3 observing time (allocation time for ranked programs in which the observing conditions are relaxed). Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (USA), the Science and Technology Facilities Council (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    8. Polarized Light Imaging of the HD 142527 Transition Disk with the Gemini Planet Imager: Dust around the Close-in Companion

      NASA Astrophysics Data System (ADS)

      Rodigas, Timothy J.; Follette, Katherine B.; Weinberger, Alycia; Close, Laird; Hines, Dean C.

      2014-08-01

      When giant planets form, they grow by accreting gas and dust. HD 142527 is a young star that offers a scaled-up view of this process. It has a broad, asymmetric ring of gas and dust beyond ~100 AU and a wide inner gap. Within the gap, a low-mass stellar companion orbits the primary star at just ~12 AU, and both the primary and secondary are accreting gas. In an attempt to directly detect the dusty counterpart to this accreted gas, we have observed HD 142527 with the Gemini Planet Imager in polarized light at Y band (0.95-1.14 μm). We clearly detect the companion in total intensity and show that its position and photometry are generally consistent with the expected values. We also detect a point source in polarized light that may be spatially separated by ~ a few AU from the location of the companion in total intensity. This suggests that dust is likely falling onto or orbiting the companion. Given the possible contribution of scattered light from this dust to previously reported photometry of the companion, the current mass limits should be viewed as upper limits only. If the dust near the companion is eventually confirmed to be spatially separated, this system would resemble a scaled-up version of the young planetary system inside the gap of the transition disk around LkCa 15. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministrio da Cincia, Tecnologia e Inovao (Brazil), and Ministerio de Ciencia, Tecnologa e Innovacin Productiva (Argentina).

    9. Time Delay Measurements for the Cluster-lensed Sextuple Quasar SDSS J2222+2745

      NASA Astrophysics Data System (ADS)

      Dahle, H.; Gladders, M. D.; Sharon, K.; Bayliss, M. B.; Rigby, J. R.

      2015-11-01

      We report first results from an ongoing monitoring campaign to measure time delays between the six images of the quasar SDSS J2222+2745, gravitationally lensed by a galaxy cluster. The time delay between A and B, the two most highly magnified images, is measured to be {τ }{{AB}}=47.7+/- 6.0 days (95% confidence interval), consistent with previous model predictions for this lens system. The strong intrinsic variability of the quasar also allows us to derive a time delay value of {τ }{{CA}}=722+/- 24 days between image C and A, in spite of modest overlap between their light curves in the current data set. Image C, which is predicted to lead all the other lensed quasar images, has undergone a sharp, monotonic flux increase of 60%-75% during 2014. A corresponding brightening is firmly predicted to occur in images A and B during 2016. The amplitude of this rise indicates that time delays involving all six known images in this system, including those of the demagnified central images D-F, will be obtainable from further ground-based monitoring of this system during the next few years. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, and including observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnologi´a e Innovación Productiva (Argentina).

    10. Incorporating climate science in applications of the US endangered species act for aquatic species.

      PubMed

      McClure, Michelle M; Alexander, Michael; Borggaard, Diane; Boughton, David; Crozier, Lisa; Griffis, Roger; Jorgensen, Jeffrey C; Lindley, Steven T; Nye, Janet; Rowland, Melanie J; Seney, Erin E; Snover, Amy; Toole, Christopher; VAN Houtan, Kyle

      2013-12-01

      Aquatic species are threatened by climate change but have received comparatively less attention than terrestrial species. We gleaned key strategies for scientists and managers seeking to address climate change in aquatic conservation planning from the literature and existing knowledge. We address 3 categories of conservation effort that rely on scientific analysis and have particular application under the U.S. Endangered Species Act (ESA): assessment of overall risk to a species; long-term recovery planning; and evaluation of effects of specific actions or perturbations. Fewer data are available for aquatic species to support these analyses, and climate effects on aquatic systems are poorly characterized. Thus, we recommend scientists conducting analyses supporting ESA decisions develop a conceptual model that links climate, habitat, ecosystem, and species response to changing conditions and use this model to organize analyses and future research. We recommend that current climate conditions are not appropriate for projections used in ESA analyses and that long-term projections of climate-change effects provide temporal context as a species-wide assessment provides spatial context. In these projections, climate change should not be discounted solely because the magnitude of projected change at a particular time is uncertain when directionality of climate change is clear. Identifying likely future habitat at the species scale will indicate key refuges and potential range shifts. However, the risks and benefits associated with errors in modeling future habitat are not equivalent. The ESA offers mechanisms for increasing the overall resilience and resistance of species to climate changes, including establishing recovery goals requiring increased genetic and phenotypic diversity, specifying critical habitat in areas not currently occupied but likely to become important, and using adaptive management. Incorporación de las Ciencias Climáticas en las Aplicaciones del

    11. Magnetic Paleofield of Avanhandava H4 Chondrite's Matrix and Chondrules - Implications on Magnetic Fields in Early Solar System.

      NASA Astrophysics Data System (ADS)

      Kohout, T.; Pesonen, L. J.

      2005-12-01

      The Avanhandava (H4) fall occurred in 1952 in Brazil. A total of 9.33 kg had been preserved after the meteorite brake up during the impact [1]. The meteorite contains large (0.1 - 2.0 mm) chon-drules that have clearly delineated boundaries with matrix. This characteristic allows us to pick up oriented individual chondrules and study their magnetic properties. The chondrules of the Avanhandava meteorite show a low and randomly oriented NRM (10-2 - 10-1 mAm2/kg). In contrast the matrix is strongly (100 - 101 mAm2/kg) and uniformly magnet-ized [2]. Various methods for paleofield determination have been applied on matrix and individual chondrules in order to determine possi-ble magnetizing processes and paleofields in early solar systems.. The laboratory experiments reveal approximate paleofields for matrix similar to present geomagnetic field. The paleofield de-termined for chondrules is approximately one order of magnitude lower comparing to values obtained for matrix. That suggests that chondrules are not magnetically contaminated by geomagnetic or artificial fields and they acquired their NRM prior their aggregation to Avanhandava parent body (random NRM directions). The matrix shows remarkable traces of terres-trial weathering and is uniformly magnetized. The paleofield re-sult for matrix indicates possible remagnetization caused by ter-restrial weathering. The terrestrial weathering of ordinary chon-drites is observed even on falls stored in museums and can sig-nificantly influence meteorite magnetic records [3, 4]. References: [1] Paar W. et al. 1976. Revista Brasileira de Geo-ciencias 6: 201-210. [2] Kohout T. and Pesonen L. J. 2005. 68th Annual Meteoritical Society Meeting: 5202. [3] Kohout T. et al. 2004. Physics and Chemistry of the Earth 29: 885-897. [4] Lee M. R. and Bland P. A. 2004. Geochimica et Cosmochimica Acta 68: 893-916.

    12. Spectroscopic Evidence for SN 2010ma Associated with GRB 101219B

      NASA Astrophysics Data System (ADS)

      Sparre, M.; Sollerman, J.; Fynbo, J. P. U.; Malesani, D.; Goldoni, P.; de Ugarte Postigo, A.; Covino, S.; D'Elia, V.; Flores, H.; Hammer, F.; Hjorth, J.; Jakobsson, P.; Kaper, L.; Leloudas, G.; Levan, A. J.; Milvang-Jensen, B.; Schulze, S.; Tagliaferri, G.; Tanvir, N. R.; Watson, D. J.; Wiersema, K.; Wijers, R. A. M. J.

      2011-07-01

      We report on the spectroscopic detection of supernova SN 2010ma associated with the long gamma-ray burst GRB 101219B. We observed the optical counterpart of the GRB on three nights with the X-shooter spectrograph at the Very Large Telescope. From weak absorption lines, we measure a redshift of z = 0.55. The first-epoch UV-near-infrared afterglow spectrum, taken 11.6 hr after the burst, is well fit by a power law consistent with the slope of the X-ray spectrum. The second- and third-epoch spectra (obtained 16.4 and 36.7 days after the burst), however, display clear bumps closely resembling those of the broad-lined type-Ic SN 1998bw if placed at z = 0.55. Apart from demonstrating that spectroscopic SN signatures can be observed for GRBs at these large distances, our discovery makes a step forward in establishing a general connection between GRBs and SNe. In fact, unlike most previous unambiguous GRB-associated SNe, GRB 101219B has a large gamma-ray energy (E iso = 4.2 × 1051 erg), a bright afterglow, and obeys the "Amati" relation, thus being fully consistent with the cosmological population of GRBs. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile, under program 086.A-0073(B). Also based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovacón Productiva (Argentina).

    13. Nutrition therapy for chronic obstructive pulmonary disease and related nutritional complications.

      PubMed

      Fernandes, Amanda Carla; Bezerra, Olívia Maria de Paula Alves

      2006-01-01

      Chronic obstructive pulmonary disease is characterized by progressive and partially reversible airway obstruction. The innumerable complications that occur during the progression of the disease can affect the nutritional state of patients suffering from this illness. The objective of this study was to present a brief review of the literature regarding the nutrition therapy used in the treatment of chronic obstructive pulmonary disease. To that end, we performed a bibliographic search for related articles published within the last 18 years and indexed for the Literatura Latinoamericana y del Caribe en Ciencias de la Salud (LILACS, Latin American and Caribbean Health Sciences Literature) and Medline databases. Malnutrition is associated with a poor prognosis for patients with chronic obstructive pulmonary disease, since it predisposes such patients to infections, as well as reducing respiratory muscle force, exercise tolerance and quality of life. Despite the fact that such malnutrition is extremely common in chronic obstructive pulmonary disease patients, it should be recognized as an independent risk factor, since it can be modified through appropriate and efficacious diet therapy and monitoring. For patients with chronic obstructive pulmonary disease, nutrition therapy is initiated after the evaluation of the nutritional state of the patient, which identifies nutritional risk, thereby allowing the proper level of treatment to be established. In this evaluation, anthropometric and biochemical markers, as well as indicators of dietary consumption and body composition, should be used. The prescribed diet should contain appropriate proportions of macronutrients, micronutrients and immunonutrients in order to regain or maintain the proper nutritional state and to avoid complications. The physical characteristics of the diet should be tailored to the individual needs and tolerances of each patient. In the treatment of patients with chronic obstructive pulmonary disease

    14. Hispanic Latin America, Spain and the Spanish-speaking Caribbean: a rich source of reference material for public health, epidemiology and tropical medicine.

      PubMed

      Williams, John R; Bórquez, Annick; Basáñez, María-Gloria

      2008-01-01

      There is a multiplicity of journals originating in Spain and the Spanish-speaking countries of Latin America and the Caribbean (SSLAC) in the health sciences of relevance to the fields of epidemiology and public health. While the subject matter of epidemiology in Spain shares many features with its neighbours in Western Europe, many aspects of epidemiology in Latin America are particular to that region. There are also distinctive theoretical and philosophical approaches to the study of epidemiology and public health arising from traditions such as the Latin American social medicine movement, of which there may be limited awareness. A number of online bibliographic databases are available which focus primarily on health sciences literature arising in Spain and Latin America, the most prominent being Literatura Latinoamericana en Ciencias de la Salud (LILACS) and LATINDEX. Some such as LILACS also extensively index grey literature. As well as in Spanish, interfaces are provided in English and Portuguese. Abstracts of articles may also be provided in English with an increasing number of journals beginning to publish entire articles written in English. Free full text articles are becoming accessible, one of the most comprehensive sources being the Scientific Electronic Library Online (SciELO). There is thus an extensive range of literature originating in Spain and SSLAC freely identifiable and often accessible online, and with the potential to provide useful inputs to the study of epidemiology and public health provided that any reluctance to explore these resources can be overcome. In this article we provide an introduction to such resources. PMID:19243576

    15. Systematic review of randomised controlled trials of strategies to promote adherence to tuberculosis treatment.

      PubMed Central

      Volmink, J.; Garner, P.

      1997-01-01

      OBJECTIVE: To determine the effectiveness of strategies to promote adherence to treatment for tuberculosis. IDENTIFICATION: Searches in Medline (1966 to August 1996), the Cochrane trials register (up to October 1996), and LILACS (Literatura Latinoamericana y del Caribe en Ciencias de la Salud) (1982 to September 1996); screening of references in articles on compliance and adherence; contact with experts in research on tuberculosis and adherence. INCLUSION CRITERIA: Randomised or pseudorandomised controlled trials of interventions to promote adherence with curative or preventive treatment for tuberculosis, with at least one measure of adherence. MAIN OUTCOME MEASURE: Relative risks and 95% confidence intervals for estimates of effect for categorical outcomes. RESULTS: Five trials met the inclusion criteria. The relative risk for tested reminder cards sent to patients who defaulted on treatment was 1.2 (95% confidence interval 1.1 to 1.4), for help given to patients by lay health workers 1.4 (1.1 to 1.8), for monetary incentives offered to patients 1.6 (1.3 to 2.0), for health education 1.2 (1.1 to 1.4), for a combination of a patient incentive and health education 2.4 (1.5 to 3.7) or 1.1 (1.0 to 1.2), and for intensive supervision of staff in tuberculosis clinics 1.2 (1.1 to 1.3). There were no completed trials of directly observed treatment. All of the interventions tested improved adherence. On current evidence it is unclear whether health education by itself leads to better adherence to treatment. CONCLUSIONS: Reliable evidence is available to show some specific strategies improve adherence to tuberculosis treatment, and these should be adopted in health systems, depending on their appropriateness to practice circumstances. Further innovations require testing to help find specific approaches that will be useful in low income countries. Randomised controlled trials evaluating the independent effects of directly observed treatment are awaited. PMID:9418086

    16. Instruction No. 3/1988, 1 June 1988.

      PubMed

      1988-01-01

      This Instruction contains provisions relating to the injury and maltreatment of children and women and the enforcement of support payments to women and children. With respect to the maltreatment of children, it provides that the Spanish Office of the Public Prosecutor shall a) curb child abuse; b) take decisive action to protect minors who have been abused or are helpless and to execute the new responsibilities imposed by Law 21/1987 of November 11, which modifies the Civil Code with respect to adoption; and c) collect the necessary data with regard to felonies or misdemeanors that involve child abuse so as to allow for the compilation of annual statistics which may identify the magnitude of this problem; With respect to the maltreatment of women, the prosecutor shall a) curb the abuse of women, investigating those cases where a lack of evidence exists because women are afraid; and b) collect the necessary data with regard to felonies or misdemeanors that involve the abuse of women so as to allow for the compilation of annual statistics which may identify the social reality of this problem. With respect to support payments, the Instruction urges all prosecutors to monitor the execution of support payments using all judicial means authorized, including penal actions when applicable, or enforcement mechanisms which have been mentioned in this memo, that is, conditioning visitation rights on timely payment of the support established for food and education of the children. In Circular No. 32 of 15 April 1988, the National Directorate of Police is called on to provide all necessary police assistance to women who have been the object of illegitimate acts of force so that they can report such acts and to inform women of laws designed to help them and the means of availing themselves of these laws. See Anuario de Derecho Penal y Ciencias Penales, Vol. 41, No. 3, September-December 1988, p. 978. PMID:12289172

    17. Toward a Mexican eddy covariance network for carbon cycle science

      NASA Astrophysics Data System (ADS)

      Vargas, Rodrigo; Yépez, Enrico A.

      2011-09-01

      First Annual MexFlux Principal Investigators Meeting; Hermosillo, Sonora, Mexico, 4-8 May 2011; The carbon cycle science community has organized a global network, called FLUXNET, to measure the exchange of energy, water, and carbon dioxide (CO2) between the ecosystems and the atmosphere using the eddy covariance technique. This network has provided unprecedented information for carbon cycle science and global climate change but is mostly represented by study sites in the United States and Europe. Thus, there is an important gap in measurements and understanding of ecosystem dynamics in other regions of the world that are seeing a rapid change in land use. Researchers met under the sponsorship of Red Temática de Ecosistemas and Consejo Nacional de Ciencia y Tecnologia (CONACYT) to discuss strategies to establish a Mexican eddy covariance network (MexFlux) by identifying researchers, study sites, and scientific goals. During the meeting, attendees noted that 10 study sites have been established in Mexico with more than 30 combined years of information. Study sites span from new sites installed during 2011 to others with 9 to 6 years of measurements. Sites with the longest span measurements are located in Baja California Sur (established by Walter Oechel in 2002) and Sonora (established by Christopher Watts in 2005); both are semiarid ecosystems. MexFlux sites represent a variety of ecosystem types, including Mediterranean and sarcocaulescent shrublands in Baja California; oak woodland, subtropical shrubland, tropical dry forest, and a grassland in Sonora; tropical dry forests in Jalisco and Yucatan; a managed grassland in San Luis Potosi; and a managed pine forest in Hidalgo. Sites are maintained with an individual researcher's funds from Mexican government agencies (e.g., CONACYT) and international collaborations, but no coordinated funding exists for a long-term program.

    18. Assessment of African and local wind-blown dust contributions at three rural sites in SE Spain: aerosol size distribution

      NASA Astrophysics Data System (ADS)

      Orza, J. A. G.; Cabello, M.; Lidón, V.; Martínez, J.

      2009-04-01

      Aerosol number size distribution and meteorological parameters were measured at three rural sites in semiarid southeastern Spain. Number concentrations of suspended particles in 31 size bins between 0.25 and 32 m diameter were continuosly recorded with a GRIMM 190 aerosol spectrometer at: (i) a rural background (RB) location in a perennial tussock grassland, from July to October 2006; (ii) a rural site surrounded by abandoned croplands, and influenced by mineral industries and by a small paved road having a small traffic load located 30 m to the East (RA), from June to December 2007; and (iii) a rural (R) location in an agricultural plot previously cleared and then lightly leveled and compacted for future lemon-tree cultivation, from February to June 2008. Events of long range transport from North Africa to the study area (African dust outbreaks, ADOs) were identified by aerosol transport models, back-trajectories and satellite imagery. There is an increase in the concentration of particles larger than 2 m with increasing wind speed while the concentrations decrease for smaller particles at the RB and R sites. At the RA location, that increase is observed for particles in the range 1.6 - 3.5 m (the precise value depends on the wind speed) when there are West winds. Particulate resuspension is found to occur at all wind speeds, although wind threshold values can be identified by a sharp increase in particle concentrations for a range of particle sizes. Light winds entrain large particles while stronger winds additionally entrain particles of smaller size (down to 2.5 m for the highest winds). The size distributions present maxima at 1.6 and 3 m on days with ADO. Concentration for almost every particle size is higher on ADOs than on days without such events, due in part to the associated meteorological situation. This work was partially supported by the Spanish Ministerio de Educación y Ciencia under grant CGL2004-04419 (RESUSPENSE Project).

    19. [Earth Sciences Research

      NASA Technical Reports Server (NTRS)

      2004-01-01

      contents include the following: 1. Argentina Field Expedition (2004). NASA funds supported joint fieldwork by Peter Makovicky (Dept. of Geology, TFM) and Sebastian Apesteguia (Museo Argentino de Ciencias Naturales, Buenos Aires) in a fossil-rich locality in the Cenomanian Candeleros Formation of northern Rio Negro Province, Argentina. The goal of this fieldwork was to collect small fossil vertebrates, which are abundant in this formation, with a special emphasis on small theropod (casmivorous) dinosaurs. 2. East Greenland Field Expedition (2004). During July-August 2004 the Field Museum led a month long expedition to Jameson Land in East Greenland to collect Triassic-Jurassic aged fossil plants from one of the most productive sites of this age in the world. The project aims include the study of events leading up to catastrophic changes in the biota and atmosphere that occurred about 200 million years ago. 3. Chile Field Expedition (March, 2004). Paleontological reconnaisance of the central Andean main range by helicopter: additional new Cenozoic mammal faunas from Chile. A several thousand sq km swath of the central Andean Cordillera was prospected by helicopter during 2004, permitting rapid survey of large areas in remote or difficult to access regions. This led to the recovery of fossils from several parts of the range, and the identification of sites worthy of future attention. 4. Wyoming Field Expedition (2004). NASA funds supported a three-week field program by Curator of Dinosaurs Peter Makovicky and a crew of Field Museum staff and volunteers at several sites in the Early Cretaceous Cloverly Formation of north-central Wyoming. The nine-member team excavated a number of sites that had been discovered over the preceding two summers.

    20. The impact of a Latino outreach project on science museums: A program evaluation focused on institutional change

      NASA Astrophysics Data System (ADS)

      Castaneda, Mario E.

      The purpose of this program evaluation was to determine the impact of the Community Science Festivals Project on the science museums that participated. This project, also known as Celebra la Ciencia (CLC), was a federally funded effort to engage the Latino communities throughout the United States in activities promoting appreciation of the importance of science education. The festivals brought together various educational, community, and scientific organizations that collaborated in producing community-hosted interactive educational events to which students and their families were invited. The evaluation takes the form of a qualitative study based on interviews of key individuals at 1 museum in each of the 5 festival cities. The evaluation focuses on the museums' changes in: (a) their view of their roles as involving the Latino population in their service area, (b) publicity efforts aimed at the Latino population, (c) outreach toward the Latino population, and (d) accommodation of Latinos within the museums. The results for each site are listed separately then are discussed jointly. Implications for practice include the following: (a) intensive and long-term programming, as opposed to one-time events, are likely more effective for creating direct impact on student achievement, although the festivals had many positive effects; (b) funding for smaller organizations (or individual departments within larger organization) seemed to have a more observable impact, enabling them to create Latino-oriented advertising, outreach, and accommodations that would not have been possible otherwise; and (c) Spanish-language media was an effective advertising tool, especially radio, but use of public service announcements should be monitored to ensure that they are aired at times that are effective for reaching the target audience. Recommendations for future studies are made.

    1. Eastern Equine Encephalitis in Latin America

      PubMed Central

      Carrera, Jean-Paul; Forrester, Naomi; Wang, Eryu; Vittor, Amy Y.; Haddow, Andrew D.; López-Vergès, Sandra; Abadía, Ivan; Castaño, Elizabeth; Sosa, Nestor; Báez, Carmen; Estripeaut, Dora; Díaz, Yamilka; Beltrán, Davis; Cisneros, Julio; Cedeño, Hector G.; da Rosa, Amelia P. Travassos; Hernandez, Humberto; Martínez-Torres, Alex O.; Tesh, Robert B.; Weaver, Scott C.

      2013-01-01

      BACKGROUND The eastern equine encephalitis (EEE) and Venezuelan equine encephalitis (VEE) viruses are pathogens that infect humans and horses in the Americas. Outbreaks of neurologic disease in humans and horses were reported in Panama from May through early August 2010. METHODS We performed antibody assays and tests to detect viral RNA and isolate the viruses in serum samples from hospitalized patients. Additional cases were identified with enhanced surveillance. RESULTS A total of 19 patients were hospitalized for encephalitis. Among them, 7 had confirmed EEE, 3 had VEE, and 1 was infected with both viruses; 3 patients died, 1 of whom had confirmed VEE. The clinical findings for patients with EEE included brain lesions, seizures that evolved to status epilepticus, and neurologic sequelae. An additional 99 suspected or probable cases of alphavirus infection were detected during active surveillance. In total, 13 cases were confirmed as EEE, along with 11 cases of VEE and 1 case of dual infection. A total of 50 cases in horses were confirmed as EEE and 8 as VEE; mixed etiologic factors were associated with 11 cases in horses. Phylogenetic analyses of isolates from 2 cases of equine infection with the EEE virus and 1 case of human infection with the VEE virus indicated that the viruses were of enzootic lineages previously identified in Panama rather than new introductions. CONCLUSIONS Cases of EEE in humans in Latin America may be the result of ecologic changes that increased human contact with enzootic transmission cycles, genetic changes in EEE viral strains that resulted in increased human virulence, or an altered host range. (Funded by the National Institutes of Health and the Secretaría Nacional de Ciencia, Tecnología e Innovación, Panama.) PMID:23964935

    2. Hispanic Latin America, Spain and the Spanish-speaking Caribbean: A rich source of reference material for public health, epidemiology and tropical medicine

      PubMed Central

      Williams, John R; Bórquez, Annick; Basáñez, María-Gloria

      2008-01-01

      There is a multiplicity of journals originating in Spain and the Spanish-speaking countries of Latin America and the Caribbean (SSLAC) in the health sciences of relevance to the fields of epidemiology and public health. While the subject matter of epidemiology in Spain shares many features with its neighbours in Western Europe, many aspects of epidemiology in Latin America are particular to that region. There are also distinctive theoretical and philosophical approaches to the study of epidemiology and public health arising from traditions such as the Latin American social medicine movement, of which there may be limited awareness. A number of online bibliographic databases are available which focus primarily on health sciences literature arising in Spain and Latin America, the most prominent being Literatura Latinoamericana en Ciencias de la Salud (LILACS) and LATINDEX. Some such as LILACS also extensively index grey literature. As well as in Spanish, interfaces are provided in English and Portuguese. Abstracts of articles may also be provided in English with an increasing number of journals beginning to publish entire articles written in English. Free full text articles are becoming accessible, one of the most comprehensive sources being the Scientific Electronic Library Online (SciELO). There is thus an extensive range of literature originating in Spain and SSLAC freely identifiable and often accessible online, and with the potential to provide useful inputs to the study of epidemiology and public health provided that any reluctance to explore these resources can be overcome. In this article we provide an introduction to such resources. PMID:19243576

    3. SLGRID: spectral synthesis software in the grid

      NASA Astrophysics Data System (ADS)

      Sabater, J.; Sánchez, S.; Verdes-Montenegro, L.

      2011-11-01

      SLGRID (http://www.e-ciencia.es/wiki/index.php/Slgrid) is a pilot project proposed by the e-Science Initiative of Andalusia (eCA) and supported by the Spanish e-Science Network in the frame of the European Grid Initiative (EGI). The aim of the project was to adapt the spectral synthesis software Starlight (Cid-Fernandes et al. 2005) to the Grid infrastructure. Starlight is used to estimate the underlying stellar populations (their ages and metallicities) using an optical spectrum, hence, it is possible to obtain a clean nebular spectrum that can be used for the diagnostic of the presence of an Active Galactic Nucleus (Sabater et al. 2008, 2009). The typical serial execution of the code for big samples of galaxies made it ideal to be integrated into the Grid. We obtain an improvement on the computational time of order N, being N the number of nodes available in the Grid. In a real case we obtained our results in 3 hours with SLGRID instead of the 60 days spent using Starlight in a PC. The code has already been ported to the Grid. The first tests were made within the e-CA infrastrusture and, later, itwas tested and improved with the colaboration of the CETA-CIEMAT. The SLGRID project has been recently renewed. In a future it is planned to adapt the code for the reduction of data from Integral Field Units where each dataset is composed of hundreds of spectra. Electronic version of the poster at http://www.iaa.es/~jsm/SEA2010

    4. The Terror Bank (Scotia Sea, Antarctica): a remnant part of the stretched Antarctic passive margin of the Drake Passage opening

      NASA Astrophysics Data System (ADS)

      Suriñach, E.

      2009-04-01

      During January-February 2008, in the frame of the IPY, two geophysical profiles 500 km long were recorded in the Drake Passage along spreading corridors between transform faults in the southern flank of West Scotia Ridge. The profiles cross the oldest oceanic crust, the Terror Bank and the oceanic Protector Basin. The survey carried out on board the R/V Hespérides includes swath bathymetry, ultra-high resolution seismics, multichannel seismic reflection, gravity and magnetic data. Our aim was to unravel the enigma of the missing conjugate passive antarctic margin. Both profiles provide evidence of the continental nature of the Terror Bank, which is an NNE-SSW elongated high, at 2000 m depth, surrounded by the Scotia and Protector abyssal plains exceeding 3000 m depth. The Terror Bank is limited by asymmetrical slopes with NW smooth and SE sharp margins. The sedimentary record shows many erosive (channels, moats, scours, etc) and depositional (drifts with superimposed sedimentary waves) features related to the water mass circulation. Minima values of the Bouguer anomaly point to the thinned continental nature of the Terror Bank. Several half grabens bounded by north-westwards dipping faults and with sedimentary wedges, exceeding 1 km thickness, thickening south-eastwards, suggest that the initial stage of rifting was followed by an oceanic spreading axis located north-westwards. Moreover, linear sea-floor magnetic anomalies indicate that oldest chrons are placed to the west, pointing to an eastward propagation of the oceanic spreading since the initial stages of the Scotia Arc development. The new data allow us to constrain the tectonic evolution of the Oligocene initial opening stages of the Drake Passage oceanic gateway and its paleoceanographic evolution. This research was supported by the Spanish Ministerio de Educación y Ciencia projects: POL2006-13836-C03-01 and CGL2004-05646.

    5. Forest Resources, Chiefdoms and Mortuary Practices in the Neotropics: Preliminary Archaeobotanical Analysis from El Caño Funerary Complex (Coclé Province, Panamá)

      NASA Astrophysics Data System (ADS)

      Martín Seijo, M.; Torné, J. Mayo; Torné, C. Mayo; Huerta, R. Piqué i.

      2012-04-01

      El Caño site is situated on the Pacific side of Panamá, near the Río Grande. It's a funerary complex comprising different types of structures (stone structures -basalt columns, groups of sculptures and a causeway-; earthen mounds and canals; burials). The excavations supervised by Julia Mayo between 2008 and 2011 allowed to discover several lavish burials estimated to date between 700 and 1000 AD (Mayo & Mayo 2012). The data recovered has served as source of information for the pre-Columbian chiefdoms and their mortuary practices. There was carried out a detailed taphonomic study to register the complex formation processes of these burial deposits, and the significant post-depositional transformations (anthropogenic and natural processes) (Mayo & Mayo in press). Also during the excavations were recovered archaeobotanical samples; most of them charcoals. The laboratory work process consisted in the exhaustive description of the anatomical features of the different taxa identified during the charcoal analyses (the identification level varied from species to family, although in several case we couldn't propose any taxa). These samples were concentrated in structures, and in few cases dispersed in the sediment. Some of the samples analyzed were large pieces of charcoal of the wooden beams from ancient wood structures, and other pieces of charcoal and vegetable fibers were related directly with the burial practices. The charcoal analysis results aim to contribute to the knowledge of the exploitation of forest resources, of the territories where these resources were collected, and of the production process (chaîne opératoire). These results were complemented with the exhaustive review of written sources (spanish chronicles), ethnobotanical studies and archaeological data of other sites in this area. Acknowledgements: This research was developed under El Caño Archaeological Project and was funded by SENACYT (Secretaría Nacional de Ciencia y Tecnología de Panamá).

    6. Highly erodible terrain in agriculture land against chipped pruned branches. Or how to stop the soil erosion with low investment

      NASA Astrophysics Data System (ADS)

      Cerdà, A.

      2009-04-01

      The session on "Soil erosion and sediment control with vegetation and bioengineering on severely eroded terrain" pays special attention to the severe soil erosion suffered on steep slopes and erodible parent materials and soils. Within the last 20 years, in the Mediterranean lands, the citrus orchards were reallocated on steep slopes due to the urban development and better climatic and management conditions of the new plantations. The lack of vegetation cover on the new slope plantations of citrus resulted in high erosion rates. Those non-sustainable soil losses were measured by means of rainfall simulation experiments, Gerlach collectors, geomorphological transect and topographical measurements. The October 2007 and October 2008 rainy periods resulted in sheet, rill and gully erosion. Some recently planted orchards (2005) had the first pruning season in 2008. The pruned chipped branches reduced the soil losses to 50 % of the expected, although the litter (pruned branches) covered 4.67 % of the soil. This is why a research was developed by means of simulated rainfall experiments to determine the vegetation cover (litter, mainly leaves) to protect the soil to reach a sustainable erosion rate. Rainfall simulation experiments at 43 mm h-1 where performed on 1 m2 plots covered with 0, 3, 7, 15, 30, 45, 60, 80 and 100 % litter cover (pruned chipped branches) to determine the sustainable litter cover to avoid the soil losses. The results show that more that 45 % litter cover almost reduces the soil losses to negligible rates. The results confirm that 4 % of vegetation cover reduces the soil losses to 50 %. Key words: Agriculture land, erodible terrain, land management, citrus, erosion, Spain, Valencia, herbicides. Acknowledgements, We thanks the financial support of the Ministerio de Ciencia e Innovación by means of the project CGL2008-02879/BTE, "PERDIDA DE SUELO EN NUEVAS EXPLOTACIONES CITRICOLAS EN PENDIENTE. ESTRATEGIAS PARA EL CONTROL DE LA EROSION HIDRICA"

    7. Towards Year 2009, a 25 000 person rehearsal

      NASA Astrophysics Data System (ADS)

      Fierro Gossman, Julieta; Espinosa, M.

      2008-05-01

      In this presentations we will talk about the way we planned and achieved successfully a 25 000 people observation in Mexico City downtown taking advantage of a lunar eclipse. We shall guide people so they think about their own activities. We shall mention the way we planned the event, carried out found raising and advertisement. We shall describe the way we handled people mainly during the observations with one hundred telescopes and parallel activities. These included: a public lecture enhanced with dance and hands-on demonstrations, workshops for children, workshops on the night sky, talking to an astronomer, how to handle a telescope and a picture exhibit as well as music till midnight. We shall also mentioned written materials for that particular event and for Year 2009, some of which were specially crafted for teachers. Hector Dominguez y Julieta Fierro Galileo y el telescopio, 400 anios de ciencia Uribe y Ferrari Editores, 2007 ISBN 970 756 238-2 Hector Dominguez y Julieta Fierro, Galileo para Maestros I Correo del Maestro, Núm. 133, p. 15-26, Anios 12, Junio 2007. Hector Dominguez y Julieta Fierro, Galileo para Maestros II Correo del Maestro, Núm. 134, p. 17-26, Anio 12, 2007. Hector Dominguez y Julieta Fierro, Galileo para Maestros III Correo del Maestro, Num. 135, p. 10-18, Anio 12, 2007. Hector Dominguez y Julieta Fierro Experimentos sobre la caida de los cuerpos El Correo del Maestro, anio 12 Numero 142, p. 5-18, 2008. Mariana Espinosa, Julieta Fierro y Silvia Torres Fiesta de estrellas El Correo del Maestro, aceptado para su publicacion.

    8. Linking The Universe To The Community: Students As Starry Messengers For IYA2009-Puerto Rico.

      NASA Astrophysics Data System (ADS)

      Pantoja, Carmen; Lebrón, M.

      2008-05-01

      This poster presents a project at Puerto Rico to establish a working team of undergraduate students (Starry Messengers) to promote and experience the wonders of space science and education with all the senses. The students are expected to assist during the activities of the International Year of Astronomy 2009 (IYA2009). During 2008 the students will receive the appropriate instruction on observational astronomy through two workshops. These workshops follow the active learning model and therefore prepare students for outreach activities in astronomy. An innovative model of inclusion will be developed, adapting all the activities and material to include blind or visually impaired. We will encourage the participation of at least one visually impaired student or teacher on the Starry Messengers team. The greatest challenge in this project will be to develop adequate accessible activities in astronomy. The workshops will be held at the Arecibo Observatory and "El Parque de las Ciencias" Planetarium. These two centers have the facilities to develop the workshops and have the adequate settings for the participants to gain experience with astronomy research and outreach. This project targets underrepresented groups in science and engineering: hispanic students and students with visual impairments. The inquiry-based learning activities and material designed as part of the program will also be made available to the public to further promote excellence in astronomy. The workshops will serve as templates for future K-12 teacher workshops. This work has been funded by the NASA IDEAS-ER program. We would like to acknowledge the support from the Arecibo Observatory. The Arecibo Observatory is part of the National Astronomy and Ionospheric Center, which is operated by Cornell University under a Cooperative agreement with the National Science Foundation.

    9. Chile’s dilemma: how to reinsert scientists trained abroad

      PubMed Central

      2014-01-01

      Chile is recognized worldwide as an emergent economy, with a great power in natural resource exploitation. Nonetheless, despite being one of the most developed countries in Latin America, Chile imports most of the knowledge and technology necessary to drive innovation in the country. The tight budget that the Chilean government assigned to research and development and the absence of a long-term scientific agenda contributed to a limited supply of scientists over the years. In an effort to reverse this scenario, Chile has created several fellowships, such as the Becas Chile Program (BCP) to encourage new generations to pursue graduate studies to ultimately advance research and development in situ. More than 6000 fellows are now being trained abroad, accumulating an incredible potential to transform the Chilean scientific environment as we know it.  Chile now faces a greater challenge: it has to offer infrastructure and job openings to the highly skilled professionals in whom it invested. Unfortunately no clear public policies to address this situation have been developed, partially due to the lack of a dedicated institution, such as a Ministry for Science and Technology which could focalize the necessary efforts to promote such policies. Therefore, in the meantime, Chilean scientist have been motivated to create different organizations, such as, Mas Ciencia para Chile and Nexos Chile-USA, to promote constructive discussion of the policies that could be implemented to improve the Chilean scientific situation. We hope that these and other organizations have a real impact on the generation of scientific guidelines that will finally contribute to the development of the country. PMID:25309739

    10. PREFACE: International Conference on Control and Synchronization of Dynamical Systems (CSDS-2005)

      NASA Astrophysics Data System (ADS)

      Pisarchik, Alexander N.

      2005-01-01

      ) (General Director) A N Pisarchik (Centro de Investigaciones en Optica, Mexico) (Chair) R Roy (University of Maryland, USA) (SIAM representative) S Sinha (Institute of Mathematical Sciences, India) Local Organizing Committee V Aboites (Centro de Investigaciones en Optica, Mexico) R Espinosa-Luna (Centro de Investigaciones en Optica, Mexico) J H García-López (Universidad de Guadalajara, Mexico) R Jaimes-Reátegui (Universidad de Guadalajara, Mexico) A V Kir'yanov (Centro de Investigaciones en Optica, Mexico) E Kourmychev (Centro de Investigaciones en Optica, Mexico) V J Pinto-Robledo (Centro de Investigaciones en Optica, Mexico) R Rodriguez-Vera (Centro de Investigaciones en Optica, Mexico) (Research Director) G V Vazquéz-García (Centro de Investigaciones en Optica, Mexico) Funding Agencies Consejo de Ciencia y Tecnología de Estado Guanajuato, Mexico Abdus Salam International Centre for Theoretical Physics, Trieste, Italy International Mathematical Union, USA Centro Latinoamericano de Física, Brazil Academia Mexicana de Ciencias, Mexico Fundación México—Estados Unidos para la Ciencia, Mexico Cooperating Organizations International Society for Optical Engineering American Physical Society Optical Society of America Institute of Physics

    11. Patterns of evolution of research strands in the hydrologic sciences

      NASA Astrophysics Data System (ADS)

      Schwartz, F. W.; Fang, Y. C.; Parthasarathy, S.

      2005-03-01

      première contribution dans leur domaine et qui ont beaucoup influencé la recherche sont en général les plus cités. Il semble que la diminution de l'importance d'un domaine de recherche est aussi reflétée par le nombre de citations. Le modèle des citations des quelques articles classiques montre que l'activité dans le domaine ainsi que l'impact sur les articles suivantes déclinent progressivement pendant le temps ce qui présente une analogie avec les idées de Kuhn sur la science normale et révolutionnaire. Le résultat de l'étude renforce une fois de plus l'importance d'être un pionnier dans un domaine, en faisant avancer la recherche dans le domaine respectif, en adoptant des stratégies qui peuvent créer des percées majeures dans la recherche. Este artículo examina los temas de impacto e innovación en la investigación de las aguas subterráneas, mediante el uso de datos bibliométricos y del análisis de las referencias bibliográficas. El análisis se basó en 3120 artículos de la revista Water Resources Research, con el contenido completo y sus datos de referencias bibliográficas obtenidos de la Red de Ciencia ISI. La investigación se diseñó para desarrollar un entendimiento mayor de la forma en que la cantidad de citas bibliográficas puede ser interpretada por los científicos. No es sorprendente que los artículos más citados, parecen ser los pioneros en el campo, siendo artículos que divergen significativamente de lo que se ha hecho anteriormente, los cuales son efectivos creando de manera similar otros artículos "seguidores". Los artículos que son contribuciones iniciales en una línea de investigación nueva, la cual es de alta influencia, serán en promedio citados muy frecuentemente. Sin embargo, la importancia de una línea de investigación, de acuerdo a su medida por las veces que es citada, parece disminuir con el tiempo. Las tendencias en cuanto a hacer citas bibliográficas de algunos artículos clásicos, muestran que la

    12. PREFACE: XIV Mexican School on Particles and Fields

      NASA Astrophysics Data System (ADS)

      Bashir, Adnan; Contreras, Guillermo; Raya, Alfredo; Tejeda-Yeomans, Maria Elena

      2011-03-01

      The XIV Mexican School on Particles and Fields took place from 8-12 November, 2010, in the colonial city of Morelia, Michoacan, Mexico. The format of the school was such that the morning sessions were devoted to theoretical and experimental reviews, whereas parallel thematic sessions were held in the afternoons. All the reviews and seminars were delivered by experts of international prestige on subjects which are of current interest to the global scientific community and are also actively pursued within Mexico. In order to equip the attending graduate students and post docs with the necessary introductory tools to allow them to benefit substantially from the specialized seminars, a series of mini-courses were offered prior to the event from 4-7 November 2010, in the Auditorium of the Faculty of Science of the University of Michoacan (UMSNH). The length of each course was about 5 hours, English being the language of instruction. An informal and friendly atmosphere was encouraged during the courses so that the students could overcome their inhibitions and actively participate in the discussions. A novel feature of this event was a colloquium aimed at the general public and younger students of pre-undergraduate level, which allowed the expert scientists to reach out to a wider community and raise their awareness and interest in one of the most fascinating and vital fields of knowledge. The XIV-MSPF was organized by the Division of Particles and Fields of the Mexican Physical Society. It was generously sponsored by several institutions: Consejo Estatal de Ciencia y Tecnológico (COECyT) del Estado de Michoacán, Universidad Michoacana de San Nicolás de Hidalgo, Universidad de Sonora, Universidad Nacional Autónoma de México, Universidad de Guanajuato, Universidad de Sinaloa, Centro de Investigaciones de Estudios Avanzados del IPN (CINVESTAV), Consejo Nacional de Ciencia y Tecnología (CONACyT), la Academia Mexicana de Ciencias and, most importantly, the Red Nacional

    13. PREFACE: XIV Mexican School on Particles and Fields

      NASA Astrophysics Data System (ADS)

      Bashir, Adnan; Contreras, Guillermo; Raya, Alfredo; Tejeda-Yeomans, Maria Elena

      2011-03-01

      The XIV Mexican School on Particles and Fields took place from 8-12 November, 2010, in the colonial city of Morelia, Michoacan, Mexico. The format of the school was such that the morning sessions were devoted to theoretical and experimental reviews, whereas parallel thematic sessions were held in the afternoons. All the reviews and seminars were delivered by experts of international prestige on subjects which are of current interest to the global scientific community and are also actively pursued within Mexico. In order to equip the attending graduate students and post docs with the necessary introductory tools to allow them to benefit substantially from the specialized seminars, a series of mini-courses were offered prior to the event from 4-7 November 2010, in the Auditorium of the Faculty of Science of the University of Michoacan (UMSNH). The length of each course was about 5 hours, English being the language of instruction. An informal and friendly atmosphere was encouraged during the courses so that the students could overcome their inhibitions and actively participate in the discussions. A novel feature of this event was a colloquium aimed at the general public and younger students of pre-undergraduate level, which allowed the expert scientists to reach out to a wider community and raise their awareness and interest in one of the most fascinating and vital fields of knowledge. The XIV-MSPF was organized by the Division of Particles and Fields of the Mexican Physical Society. It was generously sponsored by several institutions: Consejo Estatal de Ciencia y Tecnológico (COECyT) del Estado de Michoacán, Universidad Michoacana de San Nicolás de Hidalgo, Universidad de Sonora, Universidad Nacional Autónoma de México, Universidad de Guanajuato, Universidad de Sinaloa, Centro de Investigaciones de Estudios Avanzados del IPN (CINVESTAV), Consejo Nacional de Ciencia y Tecnología (CONACyT), la Academia Mexicana de Ciencias and, most importantly, the Red Nacional

    14. The Practice of Research of a Basic Education Teacher Involving Mental Models of the Phases of the Moon and Eclipses. (Spanish Title: La Práctica de Investigación de un Maestro de Educación BÁsica con El Uso de los Modelos Mentales de Las Fases de la Luna Y Eclipses.) A Prática de Pesquisa de um Professor do Ensino Fundamental Envolvendo Modelos Mentais de Fases da Lua e Eclipses

      NASA Astrophysics Data System (ADS)

      Pessôa Queiroz, Glória; Jubitipan Borges de Sousa, Carlos; Auxiliadora Delgado Machado, Maria

      2009-12-01

      The inclusion of basic education teachers in the survey domain is a controversial issue and fully debated in the academy. The opportunity for a collective work that incorporated school teachers from a public school to a university's group of physics teaching at university allowed us to glimpse the redefinition of the function of a science teacher (a coauthor of this paper) by himself, such that now he includes research on the knowledge construction by students in his teacher practice. The formation of inter-institutional groups for action planning and research in these areas has proved productive for the task of knowledge construction to support educational processes in school, while the university enriches its collection of experiences critically validated, and can consider the results in teachers initial and continued education. The active participation of the teacher in a research group at the university led him to reflect on the possible didactical ways to be described, analyzed and communicated to other teachers. The construction of a pedagogy that took into account the mental models of students on the basic topics of astronomy, and the changes developed resulting from the lessons taught, led to far-reaching consequences on the pedagogy adopted by the teacher, who incorporates now a new vision of science and alternative forms to dialogue with students, essential components for a researcher in Science Education. La inclusión de los maestros de la escuela básica en el universo de la investigación es polémica y está en amplio debate en el mundo académico. La oportunidad de trabajo colectivo de los maestros de una escuela pública en Río de Janeiro con un grupo universitario de enseñanza de la física nos ha permitido vislumbrar la redefinición de la función de un maestro de ciencias (uno de los coautores de este documento) por él mismo, ahora para incluir la investigación sobre la construcción del conocimiento por los alumnos en su práctica como

    15. Different Cultures in Astronomy Education and Their Meanings in the Classroom. (Spanish Title: Las Diferentes Culturas en la Educación en Astronomía y Sus Significados EN EL Aula. ) As Diferentes Culturas na Educação em Astronomia E Seus Significados em Sala de Aula

      NASA Astrophysics Data System (ADS)

      Pereira de Barros, Vicente; Bovolenta Ovigli, Daniel Fernando

      2014-12-01

      This paper is a reflection about the use of History of Science in the curriculum of formal education, through the discussion concerning cultural elements of several ethnic groups in Brazil, in actions related to astronomy education. The work was developed in the framework of an extension course and the analysis undertaken here refers to a meeting that discussed didactic sequences relating to that theme, based on the Brazilian law 11.645/2008, which states the obligation to present the subject "African-brazilian and indigenous History and Culture" in the official curriculum. The extension action was developed with teachers who teach Natural Sciences, in São Paulo state, discussing issues related to the use of History of Science and the relationship with cosmogonies from Iorubá and Tupi peoples, highlighting how they can enhance the work with Astronomy(ies) in the classroom. It was observed that the participants had not yet presented these themes in their classes and also did not participate in training courses that discussed these subjects. Este artículo presenta una reflexión sobre el uso de la historia de la ciencia en el currículo de la educación formal, a través de la discusión sobre el uso de los elementos culturales de los grupos étnicos en Brasil, en acciones relacionadas con la educación en astronomía. El trabajo se desarrolló en el marco de un curso de extensión y el análisis realizado aquí se refiere a un encuentro en el cual se abordaron secuencias didácticas relacionadas con ese tema, sobre la base de la ley brasilera 11.645/2008 que dispone la obligatoriedad del tema "Historia y Cultura africana e indígena en el Brasil" en el currículo oficial. La acción de extensión se desarrolló con los profesores de ciencias naturales en el interior del estado de São Paulo, discutiendo temas relacionados con el uso de la historia de la ciencia y la relación con las cosmogonías de los pueblos Iorubá y Tupi, que muestra cómo se puede mejorar

    16. List of Participants

      NASA Astrophysics Data System (ADS)

      2011-08-01

      Abigail Alvarez OlarteCINVESTAV Alba Leticia Carrillo MonteverdeDCI-UG Alberto CarramiñanaINAOE Aldo MorselliFERMI Alejandro CastillaDCI-UG Alejandro IbarraTechnical University of Munich Alma D Rojas PachecoFCFM-BUAP Alma Xochitl Gonzalez MoralesInstituto de Ciencias Nucleares, UNAM Andrew Walcott BeckwithAmerican Institute of Beam Energy Physics Ariadna Montiel ArenasDepartamento de Física, CINVESTAV Arnulfo ZepedaCinvestav Arturo Alvarez CruzInstituto de Fisica, UNAM Axel de la MacorraUNAM, IAC Azar MustafayevUniversity of Minnesota Benjamin JaramilloDCI-UG Vincent BertinCPPM-Marseille Carlos Alberto Vaquera-AraujoDCI-UG Carlos MuñozMadrid Autonoma U. & Madrid, IFT Carmine PagliaroneINFN, FNAL Carolina Lujan PeschardDCI-UG Christiane Frigerio MartinsUniversidade Federal do ABC-São Paulo Csaba BalazsMonash University David DelepineDCI-UG David G CerdenoUniversidad Autonoma de Madrid & Instituto de Fisica Teorica Debasish MajumdarSaha Institute of Nuclear Physics, Kolkata, India Dibyendu PanigrahiKandi Raj College, Kandi, Murshidabad, INDIA-742137 Dupret Alberto Santana BejaranoUniversidad de Sonora Departamento de Investigacion en Fisica Ernest MaRiverside U.C. Esteban Alejandro Reyes Pírez MontañezInstituto de Física, UNAM Federico Ortiz TrejoINSTITUTO DE ASTRONOMÍA - UNAM Francisco José de Anda NavarroUniversidad de Guadalajara González Alvarez Francisco JavierCINVESTAV-Depto. Física Gustavo Medina TancoICN-UNAM Hernando Efrain Caicedo OrtizInstituto Politecnico Nacional - IPN J D VergadosCERN & Ioannina U. James R BoyceJefferson Lab Jason SteffenFERMILAB Javier Montaño DomínguezDCI-UG Jeevan SolankiMandsaur Institue of Technology MP India Joe SatoSaitama University Jorge Luis Navarro EstradaUNAM-ICN and Universidad del Atlantico (B/quilla-Col.) Jose A R CembranosUniversity of Minnesota José DíazIFIC Jose Didino Garcia AguilarDepto. de Fisica. Cinvestav Keith OliveUniversity of Minnesota Konstantia BalasiUniversity of Ioannina, Greece Lilian Prado

    17. The Practice of Research of a Basic Education Teacher Involving Mental Models of the Phases of the Moon and Eclipses. (Spanish Title: La Práctica de Investigación de un Maestro de Educación BÁsica con El Uso de los Modelos Mentales de Las Fases de la Luna Y Eclipses.) A Prática de Pesquisa de um Professor do Ensino Fundamental Envolvendo Modelos Mentais de Fases da Lua e Eclipses

      NASA Astrophysics Data System (ADS)

      Pessôa Queiroz, Glória; Jubitipan Borges de Sousa, Carlos; Auxiliadora Delgado Machado, Maria

      2009-12-01

      The inclusion of basic education teachers in the survey domain is a controversial issue and fully debated in the academy. The opportunity for a collective work that incorporated school teachers from a public school to a university's group of physics teaching at university allowed us to glimpse the redefinition of the function of a science teacher (a coauthor of this paper) by himself, such that now he includes research on the knowledge construction by students in his teacher practice. The formation of inter-institutional groups for action planning and research in these areas has proved productive for the task of knowledge construction to support educational processes in school, while the university enriches its collection of experiences critically validated, and can consider the results in teachers initial and continued education. The active participation of the teacher in a research group at the university led him to reflect on the possible didactical ways to be described, analyzed and communicated to other teachers. The construction of a pedagogy that took into account the mental models of students on the basic topics of astronomy, and the changes developed resulting from the lessons taught, led to far-reaching consequences on the pedagogy adopted by the teacher, who incorporates now a new vision of science and alternative forms to dialogue with students, essential components for a researcher in Science Education. La inclusión de los maestros de la escuela básica en el universo de la investigación es polémica y está en amplio debate en el mundo académico. La oportunidad de trabajo colectivo de los maestros de una escuela pública en Río de Janeiro con un grupo universitario de enseñanza de la física nos ha permitido vislumbrar la redefinición de la función de un maestro de ciencias (uno de los coautores de este documento) por él mismo, ahora para incluir la investigación sobre la construcción del conocimiento por los alumnos en su práctica como

    18. Astrophysics in Schools: Playing with Observational Data. (Spanish Title: Astrofísica Escolar: Jugando con Datos Observacionales.) Astrofísica Escolar: Brincando com Dados Observacionais

      NASA Astrophysics Data System (ADS)

      Navone, Hugo D.; Scancich, Miriam; Vázquez, Rubén A.

      2011-07-01

      The use of observational records in the design of teaching sequences in Astrophysics in High Schools is quite uncommon. It is also uncommon the thematic approach within the context provided by Nature of Science. Besides these shortcomings, we should also consider the lack of proposals to use the computer as a laboratory from which nature is studied. These aspects expose the existence of a disconnection between school science and scientist's science, establishing the need for simple educational projects that promote interdisciplinary dialogue between the two fields of knowledge. Based on these assumptions, this paper presents the school reformulation of the redshift-distance problem as addressed by Hubble in his diagram, and explores the main educational dimensions emerging from it. The proposal is directed not only for senior students of high school and/or early 1st year students at University level, but also for students and teachers from teacher training colleges. Practical evidence shows that this proposal is viable, mobilizes interests about issues of Astrophysics and promotes a ludic and cooperative character among students. La utilización de registros observacionales en el diseño de secuencias didácticas en Astrofísica Escolar no es algo usual en el ámbito de la escuela media. Tampoco lo es el abordaje de temáticas desde el contexto que provee Naturaleza de la Ciencia. A estas carencias se le suma la falta de propuestas que hagan intervenir a la computadora como un laboratorio desde el cual se interpela a la naturaleza. Los aspectos mencionados exponen la existencia de un desajuste entre ciencia escolar y ciencia experta estableciendo la necesidad de elaborar proyectos educativos sencillos que promuevan el diálogo interdisciplinar entre ambos campos del conocimiento. Partiendo de estos presupuestos, en este trabajo se presenta la reformulación escolar del problema abordado por Hubble -que diera lugar al diagrama que lleva su nombre- y se exploran las

    19. Observational constraints for the circumstellar disk of the B[e] star CPD-52 9243

      NASA Astrophysics Data System (ADS)

      Cidale, L. S.; Borges Fernandes, M.; Andruchow, I.; Arias, M. L.; Kraus, M.; Chesneau, O.; Kanaan, S.; Curé, M.; de Wit, W. J.; Muratore, M. F.

      2012-12-01

      interferometric data are necessary to determine a possible binary nature of the star. Based on observations taken with: 1) Telescopes at Paranal ESO Observatory under the program 085.D-0454 and 385.D-0513A; 2) Gemini South/Phoenix instrument, science program GS-2010A-Q-41; 3) J. Sahade Telescope at Complejo Astronómico El Leoncito (CASLEO), operated under an agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, the Secretaría de Ciencia y Tecnología de la Nación and the National Universities of La Plata, Córdoba and San Juan.

    20. The chemically peculiar double-lined spectroscopic binary HD 90264

      NASA Astrophysics Data System (ADS)

      Quiroga, C.; Torres, A. F.; Cidale, L. S.

      2010-10-01

      Leoncito (CASLEO), operated under an agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, the Secretaría de Ciencia y Tecnología de la Nación and the National Universities of La Plata, Córdoba and San Juan.

    1. Volcano Monitoring in Ecuador: Three Decades of Continuous Progress of the Instituto Geofisico - Escuela Politecnica Nacional

      NASA Astrophysics Data System (ADS)

      Ruiz, M. C.; Yepes, H. A.; Hall, M. L.; Mothes, P. A.; Ramon, P.; Hidalgo, S.; Andrade, D.; Vallejo Vargas, S.; Steele, A. L.; Anzieta, J. C.; Ortiz, H. D.; Palacios, P.; Alvarado, A. P.; Enriquez, W.; Vasconez, F.; Vaca, M.; Arrais, S.; Viracucha, G.; Bernard, B.

      2014-12-01

      In 1988, the Instituto Geofisico (IG) began a permanent surveillance of Ecuadorian volcanoes, and due to activity on Guagua Pichincha, SP seismic stations and EDM control lines were then installed. Later, with the UNDRO and OAS projects, telemetered seismic monitoring was expanded to Tungurahua, Cotopaxi, Cuicocha, Chimborazo, Antisana, Cayambe, Cerro Negro, and Quilotoa volcanoes. In 1992 an agreement with the Instituto Ecuatoriano de Electrificacion strengthened the monitoring of Tungurahua and Cotopaxi volcanoes with real-time SP seismic networks and EDM lines. Thus, background activity levels became established, which was helpful because of the onset of the 1999 eruptive activity at Tungurahua and Guagua Pichincha. These eruptions had a notable impact on Baños and Quito. Unrest at Cotopaxi volcano was detected in 2001-2002, but waned. In 2002 Reventador began its eruptive period which continues to the present and is closely monitored by the IG. In 2006 permanent seismic BB stations and infrasound sensors were installed at Tungurahua and Cotopaxi under a cooperative program supported by JICA, which allowed us to follow Tungurahua's climatic eruptions of 2006 and subsequent eruptions up to the present. Programs supported by the Ecuadorian Secretaria Nacional de Ciencia y Tecnologia and the Secretaria Nacional de Planificacion resulted in further expansion of the IG's monitoring infrastructure. Thermal and video imagery, SO2 emission monitoring, geochemical analyses, continuous GPS and tiltmeters, and micro-barometric surveillance have been incorporated. Sangay, Soche, Ninahuilca, Pululahua, and Fernandina, Cerro Azul, Sierra Negra, and Alcedo in the Galapagos Islands are now monitored in real-time. During this time, international cooperation with universities (Blaise Pascal & Nice-France, U. North Carolina, New Mexico Tech, Uppsala-Sweden, Nagoya, etc.), and research centers (USGS & UNAVCO-USA, IRD-France, NIED-Japan, SGC-Colombia, VAAC, MIROVA) has introduced

    2. Insertion of Astronomy as a High School Subject. (Spanish Title: Inserción de Astronomia Como Materia del Ciclo Secundario.) Inserção da Astronomia Como Disciplina Curricular do Ensino Médio

      NASA Astrophysics Data System (ADS)

      Dias, Claudio André C. M.; Santa Rita, Josué R.

      2008-12-01

      Astronomy is considered among the first sciences that man dominated, however, the basic skills for the construction of knowledge, relatively to the contents "Earth and the Universe" are not being developed properly for the majority of students concluding the high school level. The students are concluding this teaching cycle without proper knowledge of several subjects in the area of Astronomy, which are mandatory in the national Curricular National Parameters (PCN). Because of this discrepancy, this work stresses the need of the incorporation of a specific subject of Astronomy in the high school, in order to reduce the gap between what is taught and which should be taught. La Astronomía es considerada una de las primeras ciencias que el hombre dominó. Sin embargo, las habilidades básicas para la construcción del conocimento, relativo al eje temático "Tierra y Universo", no vienen siendo trabajadas adecuadamente con la mayoría de los alumnos que concluyen el ciclo escolar medio. Los alumnos están concluyendo este nivel de enseñanza sin conocimentos de varios temas en el área de Astronomía, que son obligatorios según los Parámetros Curriculares Nacionales (PCN). En virtud de esta discrepancia, este trabajo enfatiza la necesidad de incorporar una disciplina específica de Astronomía em el ciclo medio, em pro de la reducción de las distorsiones entre lo que es enseñado y lo que se debe enseñar. A Astronomia é considerada uma das primeiras ciências que o homem dominou, porém as competências básicas para a construção do conhecimento, relativo ao eixo temático "Terra e Universo", não vêm sendo trabalhadas a contento com a maioria dos alunos que concluem o ensino médio. Os alunos estão concluindo este nível de ensino sem conhecimento de vários temas na área de Astronomia, que são obrigatórios nos Parâmetros Curriculares Nacionais (PCN). Em virtude desta discrepância, este trabalho vem evidenciar a necessidade da incorporação de uma

    3. Evolution of Fractal Parameters through Development Stage of Soil Crust

      NASA Astrophysics Data System (ADS)

      Ospina, Abelardo; Florentino, Adriana; Tarquis, Ana Maria

      2016-04-01

      ). REFERENCES Karperien, A. (2013). FracLac for ImageJ. Méndoza, B., Florentino, A., Hernández-Hernández, R.M., Aciego, J., Torres, D. and Vera, Elena. (2013). Biological attributes of two Quibor soils with addition of organic fertilizer and salt solutions. Revista Mexicana de Ciencias Agrícolas, 4(3), 409-421. Ospina, Abelardo, Adriana Florentino and Ana M. Tarquis (2015) Spatial Pattern of Biological Soil Crust with Fractal Geometry. Geophysical Research Abstracts, 17, EGU2015-15415-1 Toledo, V. and Florentino, A. (2009). The Microbiotic Crust On Soil. Revista de Investigación N° 68(33), 199-216.

    4. MCNeil's Nebula in Orion: The Outburst History

      NASA Astrophysics Data System (ADS)

      Briceño, C.; Vivas, A. K.; Hernández, J.; Calvet, N.; Hartmann, L.; Megeath, T.; Berlind, P.; Calkins, M.; Hoyer, S.

      2004-05-01

      We present a sequence of I-band images obtained at the Venezuela 1 m Schmidt telescope during the outburst of the nebula recently discovered by J. W. McNeil in the Orion L1630 molecular cloud. We derive photometry spanning the preoutburst state and the brightening itself, which is a unique record including 14 epochs and spanning a timescale of ~5 years. We constrain the beginning of the outburst at some time between 2003 October 28 and November 15. The light curve of the object at the vertex of the nebula, the likely exciting source of the outburst, reveals that it has brightened ~5 mag in about 4 months. The timescale for the nebula to develop is consistent with the light-travel time, indicating that we are observing light from the central source scattered by the ambient cloud into the line of sight. We also show recent FLWO optical spectroscopy of the exciting source and of the nearby HH 22. The spectrum of the source is highly reddened; in contrast, the spectrum of HH 22 shows a shock spectrum superposed on a continuum, most likely the result of reflected light from the exciting source reaching the HH object through a much less reddened path. The blue portion of this spectrum is consistent with an early B spectral type, similar to the early outburst spectrum of the FU Orionis variable star V1057 Cygni; we estimate a luminosity of L~219 Lsolar. The eruptive behavior of McNeil's Nebula, its spectroscopic characteristics and luminosity, suggest that we may be witnessing an FU Ori event on its way to maximum. By further monitoring this object, we will be able decide whether or not it qualifies as a member of this rare class of objects. Based on observations obtained at the Llano del Hato National Astronomical Observatory of Venezuela, operated by CIDA for the Ministerio de Ciencia y Tecnología, and at the Fred Lawrence Whipple Observatory (FLWO) of the Smithsonian Institution.

    5. Analysis of the Presence of Content about Astronomy in a Decade of the National High School Examination (1998-2008). (Spanish Title: Análisis de la Presencia de Contenidos de Astronomía em Uma Década del Examen Nacional de Enseñaza Secundária (1998-2008).) Análise da Presença de Conteúdos de Astronomia em Uma DÉcada do Exame Nacional do Ensino Médio (1998-2008)

      NASA Astrophysics Data System (ADS)

      Gomide, Hanny Angeles; Longhini, Marcos Daniel

      2011-07-01

      In this paper we analyzed the presence of contents of Astronomy in the National High School Examination (ENEM) in its first decade (1998-2008). We verified the number of questions addressing this topic that were present over the years, as well as the most recurrent subjects. We discussed the results from what is proposed by the official documents regarding the teaching of Astronomy in the Elementary and Secondary Education and we entertain future expectations about the presence of contents of this science in future official examinations. En este trabajo realizamos un análisis de la presencia de contenidos de Astronomía em las pruebas del Examen Nacional de Enseñanza Secundaria (ENEM) em su primera década de existência (1998-2008). Contabilizamos la cantidad de preguntas incluyendo este tema que estuvieron presentes en el transcurso de los años, así como los temas más recurrentes. Discutimos los resultados a partir de lo propuesto por los documentos oficiales en relación a la enseñanza de Astronomía en la Educación Básica y elaboramos algunos apuntes sobre futuras expectativas em relación a la presencia de contenidos de esta ciencia en examenes oficiales. No presente trabalho fizemos uma análise da presença de conteúdos de Astronomia nas provas do Exame Nacional do Ensino Médio (ENEM), em sua primeira década de existência (1998-2008). Verificamos a quantidade de questões envolvendo essa temática que estiveram presentes no decorrer dos anos, assim como os temas mais recorrentes. Discutimos os resultados a partir do que é proposto pelos documentos oficiais em relação ao ensino de Astronomia na Educação Básica e tecemos alguns apontamentos sobre a expectativa futura quanto à presença de conteúdos dessa ciência nesse exame oficial.

    6. PREFACE: XIX Latin American Symposium on Solid State Physics (SLAFES XIX)

      NASA Astrophysics Data System (ADS)

      Serquis, Adriana; Balseiro, Carlos; Bolcatto, Pablo

      2009-07-01

      ), Argentina, Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT), Argentina, Secretaría de Estado de Ciencia, Tecnología e Innovación, Provincia de Santa Fe, Argentina, Centro Latinoamericano de Física (CLAF), Universidad Nacional del Litoral, Santa Fe, Argentina, Institute of Physics (IOP) Publishing, The European Physical Journal (EPJ), EDP Science, Societa Italiana di Fisica and Springer. Adriana Serquis, Carlos Balseiro and Pablo Bolcatto

    7. Evolution of the Sedimentary Basin Within the Eastern Eez Polygon at the Gulf of Mexico

      NASA Astrophysics Data System (ADS)

      Valle, S.; Mortera-Gutierrez, C. A.; Bandy, W. L.; Escobar-Briones, E. G.; Perez, D. A.

      2013-05-01

      This study shows the seafloor structures and magnetic anomalies inside the eastern EEZ polygon at the Gulf of Mexico. The objective of this study is to examine the previous hypothesis of the Gulf of Mexico opening, based on the seafloor magnetic character. Researchers from the "Instituto de Ciencias del Mar y Limnología" at UNAM, collected , multibeam bathymetric data, high-resolution seismic reflection and magnetic profiles along 37 E-W transects during two campaigns on board the UNAM vessel, BO JUSTO SIERRA, SIGSBEE-11 in 2008 and SIGSBEE-13 in 2010. Results of the bathymetry data gathered with the EM300 multibeam echo sounder (Kongsberg) and processed with the software Caraibes from IFREMER has generated a bathymetry chart of seafloor at the Eastern Polygon, and a mosaic of back-scattering images. The high-resolution seismic profiles gathered with the subbottom profiler TOPAS PS-18 (Kongsberg) provide information on the stratigraphy sediment packages across this polygon and across the deep Mississippi Canyon. The magnetic anomalies are reduced from the data gathered with a proton-precession magnetometer, G877 (GEOMETRICS). The anomalies are modeled, based on a N_S rift at the Gulf central sector. The bathymetric chart and reflectivity mosaics of SIGSBEE-11 and SIGSBEE-13 documented the smooth relief of the seabed slope toward the Gulf central sector and abrupt morphological features associated to the meanders of the Mississippi Canyon that trend to the East. The multibeam bathymetry chart shows a relief depth that goes from 2,900 to 3,400 m from north to south. Meanders are observed in the seabed within the Eastern Polygon which is related to turbidity currents from the Mississippi River, and having a trend from west to east. The relief of the canyon shows channels with widths between 400 and 1800 m, and canyon depths up to 80 m. The high-resolution seismic sections, show well defined stratigraphy packages, where clear sediment strata are interrupted by

    8. Three-Dimensional Numerical Modeling of Crustal Growth at Active Continental Margins

      NASA Astrophysics Data System (ADS)

      Zhu, G.; Gerya, T.; Tackley, P. J.

      2011-12-01

      the finger-like plumes. We demonstrate the potential applicability of our model to clustering of arc magmatism in several subduction zones, such as Baja California (Ramos-Velázquez et al., Revista Mexicana de Ciencias Geológicas,2008), North Island of New Zealand (Booden et al., J. Volcanol. Geotherm. Res., 2010), Northeast Japan (Kimura and Yoshida,Journal of Petrology, 2006); Ecuador (Schütte et al., Tectonophysics,2010) and Lesser Antilles (Labanieh et al., EPSL,2010).

    9. 1 μm Excess Sources in the UKIDSS. I. Three T Dwarfs in the Sloan Digital Sky Survey Southern Equatorial Stripe

      NASA Astrophysics Data System (ADS)

      Matsuoka, Y.; Peterson, B. A.; Murata, K. L.; Fujiwara, M.; Nagayama, T.; Suenaga, T.; Furusawa, K.; Miyake, N.; Omori, K.; Suzuki, D.; Wada, K.

      2011-08-01

      We report the discovery of two field brown dwarfs, ULAS J0128-0041 and ULAS J0321+0051, and the rediscovery of ULAS J0226+0051 (IfA 0230-Z1), in the Sloan Digital Sky Survey (SDSS) southern equatorial stripe. They are found in the course of our follow-up observation program of 1 μm excess sources in the United Kingdom Infrared Telescope Infrared Deep Sky Survey. The Gemini Multi-Object Spectrographs spectra at red optical wavelengths (6500-10500 Å) are presented, which reveal that they are early-T dwarfs. The classification is also supported by their optical to near-infrared colors. It is noted that ULAS J0321+0051 is one of the faintest currently known T dwarfs. The estimated distances to the three objects are 50-110 pc, thus they are among the most distant field T dwarfs known. The dense temporal coverage of the target fields achieved by the SDSS-II Supernova Survey allows us to perform a simple time-series analysis of the dwarfs. We create stacked images of each year from 2002-2007 and find significant proper motions of 150-290 mas yr-1 or transverse velocities of 40-100 km s-1 for ULAS J0128-0041 and ULAS J0226+0051. We also find that there are no detectable, long-term (a-few-year) brightness variations above a few times 0.1 mag for the two brown dwarfs. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    10. KIC 9821622: An interesting lithium-rich giant in the Kepler field

      NASA Astrophysics Data System (ADS)

      Jofré, E.; Petrucci, R.; García, L.; Gómez, M.

      2015-12-01

      We report the discovery of a new exceptional young lithium-rich giant, KIC 9821622, in the Kepler field that exhibits an unusually large enhancement of α, Fe-peak, and r-process elements. From high-resolution spectra obtained with GRACES at Gemini North, we derived fundamental parameters and detailed chemical abundances of 23 elements from equivalent widths and synthesis analysis. By combining atmospheric stellar parameters with available asteroseismic data, we obtained the stellar mass, radius, and age. The data analysis reveals that KIC 9821622 is a Li-rich (A(Li)NLTE = 1.80 ± 0.2) intermediate-mass giant star (M = 1.64 M⊙) located at the red giant branch near the luminosity bump. We find unexpectedly elevated abundances of Fe-peak and r-process elements. In addition, as previously reported, we find that this is a young star (2.37 Gyr) with unusually high abundances of α-elements ([α/Fe] = 0.31). The evolutionary status of KIC 9821622 suggests that its Li-rich nature is the result of internal fresh Li that is synthesized through the Cameron-Fowler mechanism near the luminosity bump. However, its peculiar enhancement of α, Fe-peak, and r-process elements opens the possibility of external contamination by material enriched by a supernova explosion. Although it is less likely, planet accretion cannot be ruled out. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).Appendix A is available in electronic form at http://www.aanda.org

    11. Geodetic Infrastructure in the Ibiza and Barcelona Harbours for Sea Level Monitoring

      NASA Astrophysics Data System (ADS)

      Martinez-Benjamin, J. J.; Gili, J.; Lopez, R.; Tapia, A.; Perez, B.; Pros, F.

      2013-12-01

      The presentation is directed to the description of the actual situation and relevant information of the geodetic infrastructure of Ibiza and Barcelona sites for sea level determination and contribution to regional sea level rise. Time series are being analysed for mean sea level variations www.puertos.es. .In the framework of a Spanish Space Project, the instrumentation of sea level measurements has been improved by providing the Barcelona site with a radar tide gauge Datamar 2000C from Geonica s.l. near an acoustic tide gauge. Puertos del Estado installed in 2007 a MIROS radar tide gauge and the Barcelona Harbour Authority a GPS referente station in the roof of the new Control Tower situated in the Energy Pier. The radar sensor is over the water surface, on a L-shaped structure which elevates it a few meters above the quay shelf. 1-min data are transmitted to the ENAGAS Control Center by cable and then sent each 1 min to Puertos del Estado by e-mail. There is a GPS station Leica Geosystems GRX1200 GG Pro and antenna 1202. Precision levelling has been made several times in the last two years because the tower is founded in reclaimed land. The measured settlement rate is about 1cm/year that may be could mask the values registered by the tide gauge. A description of the actual infrastructure at Ibiza harbour at Marina de Botafoch, is presented and its applications to sea level monitoring and altimeter calibration in support of the main CGPS at Ibiza harbour. It is described the geometrical precision levelling made in June 2013 between the radar tide gauge and the GPS station. In particular, the CGPS located at Ibiza harbour is essential for its application to the marine campaign Baleares 2013, near Ibiza island. The main objective is to determine the altimeter bias for Jason-2, about 9:09 UTC September 15, 2013, and Saral/AltiKa, about 05:30 UTC September 16, UTC. These activities has been received funding of the Ministerio de Ciencia e Innovacion under Spanish

    12. Importance of energy balance in agriculture.

      NASA Astrophysics Data System (ADS)

      Meco, R.; Moreno, M. M.; Lacasta, C.; Tarquis, A. M.; Moreno, C.

      2012-04-01

      inputs) ones. Energy outputs (EO) are considered as the calorific value of the harvested biomass (main products and sub-products), calculated from the total production (kg/ha) and its corresponding energy coefficient (strongly correlated to the biochemical composition of the products). Based on energy inputs and outputs, energy efficiency can be expressed as (i) net energy produced (NE) (also known as energy gain or energy balance, calculated as EI-EO and expressed as MJ/ha), (ii) the energy output/input ratio (also known as energy efficiency and calculated as EO/EI), and (iii) energy productivity (EP) (Crop yield/EI, expressed as kg/MJ). Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    13. Evidence of the Evolved Nature of the B[e] Star MWC 137

      NASA Astrophysics Data System (ADS)

      Muratore, M. F.; Kraus, M.; Oksala, M. E.; Arias, M. L.; Cidale, L.; Borges Fernandes, M.; Liermann, A.

      2015-01-01

      The evolutionary phase of B[e] stars is difficult to establish due to the uncertainties in their fundamental parameters. For instance, possible classifications for the Galactic B[e] star MWC 137 include pre-main-sequence and post-main-sequence phases, with a large range in luminosity. Our goal is to clarify the evolutionary stage of this peculiar object, and to study the CO molecular component of its circumstellar medium. To this purpose, we modeled the CO molecular bands using high-resolution K-band spectra. We find that MWC 137 is surrounded by a detached cool (T=1900+/- 100 K) and dense (N=(3+/- 1)× {{10}21} {{cm}-2}) ring of CO gas orbiting the star with a rotational velocity, projected to the line of sight, of 84 ± 2 km s-1. We also find that the molecular gas is enriched in the isotope 13C, excluding the classification of the star as a Herbig Be. The observed isotopic abundance ratio (12C/13C = 25 ± 2) derived from our modeling is compatible with a proto-planetary nebula, main-sequence, or supergiant evolutionary phase. However, based on some observable characteristics of MWC 137, we propose that the supergiant scenario seems to be the most plausible. Hence, we suggest that MWC 137 could be in an extremely short-lived phase, evolving from a B[e] supergiant to a blue supergiant with a bipolar ring nebula. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), under program IDs GN-2011B-Q-24 and GN-2013B-Q-11.

    14. Discovery of the First B[e] Supergiants in M 31

      NASA Astrophysics Data System (ADS)

      Kraus, M.; Cidale, L. S.; Arias, M. L.; Oksala, M. E.; Borges Fernandes, M.

      2014-01-01

      B[e] supergiants (B[e]SGs) are transitional objects in the post-main sequence evolution of massive stars. The small number of B[e]SGs known so far in the Galaxy and the Magellanic Clouds indicates that this evolutionary phase is short. Nevertheless, the strong aspherical mass loss occurring during this phase, which leads to the formation of rings or disk-like structures, and the similarity to possible progenitors of SN1987 A emphasize the importance of B[e]SGs for the dynamics of the interstellar medium as well as stellar and galactic chemical evolution. The number of objects and their mass-loss behavior at different metallicities are essential ingredients for accurate predictions from stellar and galactic evolution calculations. However, B[e]SGs are not easily identified, as they share many characteristics with luminous blue variables (LBVs) in their quiescent (hot) phase. We present medium-resolution near-infrared K-band spectra for four stars in M 31, which have been assigned a hot LBV (candidate) status. Applying diagnostics that were recently developed to distinguish B[e]SGs from hot LBVs, we classify two of the objects as bonafide LBVs; one of them currently in outburst. In addition, we firmly classify the two stars 2MASS J00441709+4119273 and 2MASS J00452257+4150346 as the first B[e]SGs in M 31 based on strong CO band emission detected in their spectra, and infrared colors typical for this class of stars. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva

    15. The Gemini NICI planet-finding campaign: The offset ring of HR 4796 A

      NASA Astrophysics Data System (ADS)

      Wahhaj, Zahed; Liu, Michael C.; Biller, Beth A.; Nielsen, Eric L.; Hayward, Thomas L.; Kuchner, Marc; Close, Laird M.; Chun, Mark; Ftaclas, Christ; Toomey, Douglas W.

      2014-07-01

      We present J,H, CH4 short (1.578 μm), CH4 long (1.652 μm) and Ks-band images of the dust ring around the 10 Myr old star HR 4796 A obtained using the Near Infrared Coronagraphic Imager (NICI) on the Gemini-South 8.1 m Telescope. Our images clearly show for the first time the position of the star relative to its circumstellar ring thanks to NICI's translucent focal plane occulting mask. We employ a Bayesian Markov chain Monte Carlo method to constrain the offset vector between the two. The resulting probability distribution shows that the ring center is offset from the star by 16.7 ± 1.3 milliarcseconds along a position angle of 26 ± 3°, along the PA of the ring, 26.47 ± 0.04°. We find that the size of this offset is not large enough to explain the brightness asymmetry of the ring. The ring is measured to have mostly red reflectivity across the JHKs filters, which seems to indicate micron-sized grains. Just like Neptune's 3:2 and 2:1 mean-motion resonances delineate the inner and outer edges of the classical Kuiper belt, we find that the radial extent of the HR 4796 A and the Fomalhaut rings could correspond to the 3:2 and 2:1 mean-motion resonances of hypothetical planets at 54.7 AU and 97.7 AU in the two systems, respectively. A planet orbiting HR 4796 A at 54.7 AU would have to be less massive than 1.6 MJup so as not to widen the ring too much by stirring. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).Tables 5 and 6 are available in electronic form at

    16. Geostatistical analysis of soil properties at field scale using standardized data

      NASA Astrophysics Data System (ADS)

      Millan, H.; Tarquis, A. M.; Pérez, L. D.; Matos, J.; González-Posada, M.

      2012-04-01

      -regionalization between different soil properties, which is of interest for delineating management zones within sugarcane fields. Cross-semivariograms showed larger correlation ranges than individual, univariate, semivariograms (A 29 m). All the findings were supported by multivariate spatial analysis, which showed the influence of soil tillage operations, harvesting machinery and irrigation water distribution on the status of the investigated area. Reference Millán, H., Tarquis, A.M.; Pérez, L.D.; Mato, J. and González-Posada, M. Spatial variability patterns of some Vertisol properties at a field scale using standardized data. Soil & Tillage Research, doi:10.1016/j.still.2011.11.003, 2012 (in press). Acknowledgements Funding provided by CEIGRAM (Research Centre for the Management of Agricultural and Environmental Risks) and by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    17. The Resolved Outflow from 3C 48

      NASA Astrophysics Data System (ADS)

      Shih, Hsin-Yi; Stockton, Alan

      2014-10-01

      observations included were obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    18. Gemini/GMOS imaging of globular cluster systems in five early-type galaxies

      NASA Astrophysics Data System (ADS)

      Faifer, Favio R.; Forte, Juan C.; Norris, Mark A.; Bridges, Terry; Forbes, Duncan A.; Zepf, Stephen E.; Beasley, Mike; Gebhardt, Karl; Hanes, David A.; Sharples, Ray M.

      2011-09-01

      observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation (NSF) on behalf of the Gemini partnership: the NSF (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    19. The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS): The Role of Environment and Self-regulation in Galaxy Evolution at z ~ 1

      NASA Astrophysics Data System (ADS)

      Muzzin, Adam; Wilson, Gillian; Yee, H. K. C.; Gilbank, David; Hoekstra, Henk; Demarco, Ricardo; Balogh, Michael; van Dokkum, Pieter; Franx, Marijn; Ellingson, Erica; Hicks, Amalia; Nantais, Julie; Noble, Allison; Lacy, Mark; Lidman, Chris; Rettura, Alessandro; Surace, Jason; Webb, Tracy

      2012-02-01

      dominates. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    20. GEMINI/GeMS Observations Unveil the Structure of the Heavily Obscured Globular Cluster Liller 1.

      NASA Astrophysics Data System (ADS)

      Saracino, S.; Dalessandro, E.; Ferraro, F. R.; Lanzoni, B.; Geisler, D.; Mauro, F.; Villanova, S.; Moni Bidin, C.; Miocchi, P.; Massari, D.

      2015-06-01

      Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). Based on observations gathered with the ESO-VISTA telescope (program ID 179.B-2002).

    1. Improving signal-to-noise in the direct imaging of exoplanets and circumstellar disks with MLOCI

      NASA Astrophysics Data System (ADS)

      Wahhaj, Zahed; Cieza, Lucas A.; Mawet, Dimitri; Yang, Bin; Canovas, Hector; de Boer, Jozua; Casassus, Simon; Ménard, François; Schreiber, Matthias R.; Liu, Michael C.; Biller, Beth A.; Nielsen, Eric L.; Hayward, Thomas L.

      2015-09-01

      We present a new algorithm designed to improve the signal-to-noise ratio (S/N) of point and extended source detections around bright stars in direct imaging data.One of our innovations is that we insert simulated point sources into the science images, which we then try to recover with maximum S/N. This improves the S/N of real point sources elsewhere in the field. The algorithm, based on the locally optimized combination of images (LOCI) method, is called Matched LOCI or MLOCI. We show with Gemini Planet Imager (GPI) data on HD 135344 B and Near-Infrared Coronagraphic Imager (NICI) data on several stars that the new algorithm can improve the S/N of point source detections by 30-400% over past methods. We also find no increase in false detections rates. No prior knowledge of candidate companion locations is required to use MLOCI. On the other hand, while non-blind applications may yield linear combinations of science images that seem to increase the S/N of true sources by a factor >2, they can also yield false detections at high rates. This is a potential pitfall when trying to confirm marginal detections or to redetect point sources found in previous epochs. These findings are relevant to any method where the coefficients of the linear combination are considered tunable, e.g., LOCI and principal component analysis (PCA). Thus we recommend that false detection rates be analyzed when using these techniques. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (USA), the Science and Technology Facilities Council (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    2. The Phase Space and Stellar Populations of Cluster Galaxies at z ~ 1: Simultaneous Constraints on the Location and Timescale of Satellite Quenching

      NASA Astrophysics Data System (ADS)

      Muzzin, Adam; van der Burg, R. F. J.; McGee, Sean L.; Balogh, Michael; Franx, Marijn; Hoekstra, Henk; Hudson, Michael J.; Noble, Allison; Taranu, Dan S.; Webb, Tracy; Wilson, Gillian; Yee, H. K. C.

      2014-11-01

      of distinguishing between the two. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    3. The Gemini NICI Planet-finding Campaign: Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722

      NASA Astrophysics Data System (ADS)

      Wahhaj, Zahed; Liu, Michael C.; Biller, Beth A.; Clarke, Fraser; Nielsen, Eric L.; Close, Laird M.; Hayward, Thomas L.; Mamajek, Eric E.; Cushing, Michael; Dupuy, Trent; Tecza, Matthias; Thatte, Niranjan; Chun, Mark; Ftaclas, Christ; Hartung, Markus; Reid, I. Neill; Shkolnik, Evgenya L.; Alencar, Silvia H. P.; Artymowicz, Pawel; Boss, Alan; de Gouveia Dal Pino, Elisabethe; Gregorio-Hetem, Jane; Ida, Shigeru; Kuchner, Marc; Lin, Douglas N. C.; Toomey, Douglas W.

      2011-03-01

      ência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    4. Isolated ellipticals and their globular cluster systems. III. NGC 2271, NGC 2865, NGC 3962, NGC 4240, and IC 4889

      NASA Astrophysics Data System (ADS)

      Salinas, R.; Alabi, A.; Richtler, T.; Lane, R. R.

      2015-05-01

      As tracers of star formation, galaxy assembly, and mass distribution, globular clusters have provided important clues to our understanding of early-type galaxies. But their study has been mostly constrained to galaxy groups and clusters where early-type galaxies dominate, leaving the properties of the globular cluster systems (GCSs) of isolated ellipticals as a mostly uncharted territory. We present Gemini-South/GMOS g'i' observations of five isolated elliptical galaxies: NGC 3962, NGC 2865, IC 4889, NGC 2271, and NGC 4240. Photometry of their GCSs reveals clear color bimodality in three of them, but remains inconclusive for the other two. All the studied GCSs are rather poor with a mean specific frequency SN ~ 1.5, independently of the parent galaxy luminosity. Considering information from previous work as well, it is clear that bimodality and especially the presence of a significant, even dominant, population of blue clusters occurs at even the most isolated systems, which casts doubts on a possible accreted origin of metal-poor clusters, as suggested by some models. Additionally, we discuss the possible existence of ultra-compact dwarfs around the isolated elliptical NGC 3962. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).Globular cluster photometry is available in electronic form at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/577/A59Appendices are available in

    5. Two Lensed Lyman-α Emitting Galaxies at z~ 5

      NASA Astrophysics Data System (ADS)

      Bayliss, Matthew B.; Wuyts, Eva; Sharon, Keren; Gladders, Michael D.; Hennawi, Joseph F.; Koester, Benjamin P.; Dahle, Håkon

      2010-09-01

      We present observations of two strongly lensed z ~ 5 Lyman-α emitting galaxies that were discovered in the Sloan Giant Arcs Survey (SGAS). We identify the two sources as SGAS J091541+382655 at z = 5.200 and SGAS J134331+415455 at z = 4.994. We measure their AB magnitudes at (i, z) = (23.34 ± 0.09, 23.29 ± 0.13) mag and (i, z) = (23.78 ± 0.18, 24.24+0.18 -0.16) mag and the rest-frame equivalent widths of the Lyman-α emission at 25.3 ± 4.1 Å and 135.6 ± 20.3 Å for SGAS J091541+382655 and SGAS J134331+415455, respectively. Each source is strongly lensed by a massive galaxy cluster in the foreground, and the magnifications due to gravitational lensing are recovered from strong lens modeling of the foreground lensing potentials. We use the magnification to calculate the intrinsic, unlensed Lyman-α and UV continuum luminosities for both sources, as well as the implied star formation rates. We find SGAS J091541+382655 and SGAS J134341+415455 to be galaxies with (L Ly-α, L UV) <= (0.6 L* Ly-α, 2 L*UV) and (L Ly-α, L UV) = (0.5 L* Ly-α, 0.9 L*UV), respectively. Comparison of the spectral energy distributions of both sources against stellar population models produces estimates of the mass in young stars in each galaxy; we report an upper limit of M stars <= 7.9+3.7 -2.5 × 107 M sun h -1 0.7 for SGAS J091531+382655 and a range of viable masses for SGAS J134331+415455 of 2 × 108 M sun h -1 0.7< M stars < 6 × 109 M sun h -1 0.7. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovaci

    6. Orbits and Pointing Strategies for Space-Based Telescopes into a European Space Surveillance System

      NASA Astrophysics Data System (ADS)

      Olmedo, Estrella; Sanchez-Ortiz, Noelia; Ramos-Lerate, Mercedes

      2009-03-01

      results presented in this paper are obtained during a project partially funded by the CDTI (Ministerio de Ciencia e Innovación -Spanish Government-).

    7. The Dynamically Disrupted Gap in HD 142527

      NASA Astrophysics Data System (ADS)

      Casassus, S.; Perez M., S.; Jordán, A.; Ménard, F.; Cuadra, J.; Schreiber, M. R.; Hales, A. S.; Ercolano, B.

      2012-08-01

      The vestiges of planet formation have been observed in debris disks harboring young and massive gaseous giants. The process of giant planet formation is terminated by the dissipation of gas in the protoplanetary disk. The gas-rich disk around HD 142527 features a small inner disk, a large gap from ~10 to ~140 AU, and a massive outer disk extending out to ~300 AU. The gap could have been carved out by a giant planet. We have imaged the outer regions of this gap using the adaptive optics camera NICI on Gemini South. Our images reveal that the disk is dynamically perturbed. The outer boundary of the roughly elliptical gap appears to be composed of several segments of spiral arms. The stellar position is offset by 0farcs17 ± 0farcs02 from the centroid of the cavity, consistent with earlier imaging at coarser resolutions. These transient morphological features are expected in the context of disk evolution in the presence of a perturbing body located inside the cavity. We perform hydrodynamical simulations of the dynamical clearing of a gap in a disk. A 10 M jup body in a circular orbit at r = 90 AU perturbs the whole disks, even after thousands of orbits. By then the model disk has an eccentric and irregular cavity, flanked by tightly wound spiral arms, but it is still evolving far from steady state. A particular transient configuration that is a qualitative match to HD 142527 is seen at 1.7 Myr. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). The Gemini run ID is

    8. The Properties of the 500 K Dwarf UGPS J072227.51-054031.2 and a Study of the Far-red Flux of Cold Brown Dwarfs

      NASA Astrophysics Data System (ADS)

      Leggett, S. K.; Saumon, D.; Marley, M. S.; Lodders, K.; Canty, J.; Lucas, P.; Smart, R. L.; Tinney, C. G.; Homeier, D.; Allard, F.; Burningham, Ben; Day-Jones, A.; Fegley, B.; Ishii, Miki; Jones, H. R. A.; Marocco, F.; Pinfield, D. J.; Tamura, M.

      2012-04-01

      We present i and z photometry for 25 T dwarfs and 1 L dwarf. Combined with published photometry, the data show that the i - z, z - Y, and z - J colors of T dwarfs are very red, and continue to increase through to the late-type T dwarfs, with a hint of a saturation for the latest types with T eff ≈ 600 K. We present new 0.7-1.0 μm and 2.8-4.2 μm spectra for the very late type T dwarf UGPS J072227.51-054031.2, as well as improved astrometry for this dwarf. Examination of the spectral energy distribution using new and published data, with Saumon & Marley models, shows that the dwarf has T eff = 505 ± 10 K, a mass of 3-11 M Jupiter, and an age between 60 Myr and 1 Gyr. This young age is consistent with the thin disk kinematics of the dwarf. The mass range overlaps with that usually considered to be planetary, despite this being an unbound object discovered in the field near the Sun. This apparently young rapid rotator is also undergoing vigorous atmospheric mixing, as determined by the IRAC and WISE 4.5 μm photometry and the Saumon & Marley models. The optical spectrum for this 500 K object shows clearly detected lines of the neutral alkalis Cs and Rb, which are emitted from deep atmospheric layers with temperatures of 900-1200 K. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina); also based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan; and also based on observations made at the UK Infrared Telescope

    9. Parallel Computation of Orbit Determination for Space Debris Population

      NASA Astrophysics Data System (ADS)

      Olmedo, Estrella; Sanchez-Ortiz, Noelia; Ramos-Lerate, Mercedes

      2009-03-01

      its real IKCM is in agreement with that imposed) survive. Those ones that are far away of the real solution make SRIF to diverge and are skipped from the initial cloud. We will show numerical results and we will compare the accuracy with the numerical results obtained by applying directly the results of the IOD to the SRIF. Implementation of the algorithm in a cluster of PCs will also be addressed. The reported algorithm has been implemented in the Advanced Space Surveillance System simulator (AS4) and developed by DEIMOS Space. The project has been partially funded by the CDTI (Ministerio de Ciencia e Innovación (Spanish Government)).

    10. Spectroscopy of the Inner Companion of the Pulsar PSR J0337+1715

      NASA Astrophysics Data System (ADS)

      Kaplan, David L.; van Kerkwijk, Marten H.; Koester, Detlev; Stairs, Ingrid H.; Ransom, Scott M.; Archibald, Anne M.; Hessels, Jason W. T.; Boyles, Jason

      2014-03-01

      The hierarchical triple system PSR J0337+1715 offers an unprecedented laboratory to study secular evolution of interacting systems and to explore the complicated mass-transfer history that forms millisecond pulsars and helium-core white dwarfs. The latter in particular, however, requires knowledge of the properties of the individual components of the system. Here we present precise optical spectroscopy of the inner companion in the PSR J0337+1715 system. We confirm it as a hot, low-gravity DA white dwarf with T eff = 15, 800 ± 100 K and log10(g) = 5.82 ± 0.05. We also measure an inner mass ratio of 0.1364 ± 0.0015, entirely consistent with that inferred from pulsar timing, and a systemic radial velocity of 29.7 ± 0.3 km s-1. Combined with the mass (0.19751 M ⊙) determined from pulsar timing, our measurement of the surface gravity implies a radius of 0.091 ± 0.005 R ⊙ combined further with the effective temperature and extinction, the photometry implies a distance of 1300 ± 80 pc. The high temperature of the companion is somewhat puzzling: with current models, it likely requires a recent period of unstable hydrogen burning, and suggests a surprisingly short lifetime for objects at this phase in their evolution. We discuss the implications of these measurements in the context of understanding the PSR J0337+1715 system, as well as of low-mass white dwarfs in general. Based on observations obtained under Program GN-2012B-Q-43 at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    11. A Compact Group of Galaxies at z = 2.48 Hosting an AGN-driven Outflow

      NASA Astrophysics Data System (ADS)

      Shih, Hsin-Yi; Stockton, Alan

      2015-12-01

      We present observations of a remarkable compact group of galaxies at z = 2.48. Four galaxies, all within 40 kpc of each other, surround a powerful high-redshift radio source. This group comprises two compact red passive galaxies and a pair of merging galaxies. One of the red galaxies, with an apparent stellar mass of 3.6 × 1011M⊙ and an effective radius of 470 pc, is one of the most extreme examples of a massive quiescent compact galaxy found so far. One of the pair of merging galaxies hosts the active galactic nucleus (AGN) producing the large powerful radio structure. The merger is massive and enriched, consistent with the mass-metallicity relation expected at this redshift. Close to the merging nuclei, the emission lines exhibit broad and asymmetric profiles that suggest outflows powered either by a very young expanding radio jet or by AGN radiation. At ≳50 kpc from the system, we found a fainter extended-emission region that may be a part of a radio-jet-driven outflow. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The work is also based, in part, on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan, and on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    12. Spectroscopic Study of Extended Star Clusters in Dwarf Galaxy NGC 6822

      NASA Astrophysics Data System (ADS)

      Hwang, Narae; Park, Hong Soo; Lee, Myung Gyoon; Lim, Sungsoon; Hodge, Paul W.; Kim, Sang Chul; Miller, Bryan; Weisz, Daniel

      2014-03-01

      We present a spectroscopic study of the four extended star clusters (ESCs) in NGC 6822 based on the data obtained with the Gemini Multi-Object Spectrograph on the Gemini-South 8.1 m telescope. The radial velocities derived from the spectra range from -61.2 ± 20.4 km s-1 (for C1) to -115.34 ± 57.9 km s-1 (for C4) and, unlike the intermediate-age carbon stars, they do not display any sign of systematic rotation around NGC 6822. The ages and metallicities derived using the Lick indices show that the ESCs are old (>=8 Gyr) and metal poor ([Fe/H] <~ -1.5). NGC 6822 is found to have both metal poor ([Fe/H] ≈-2.0) and metal rich ([Fe/H] ≈-0.9) star clusters within 15' (2 kpc) from the center, whereas only metal poor clusters are observed in the outer halo with r >= 20'(2.6 kpc). The kinematics, old ages, and low metallicities of ESCs suggest that ESCs may have accreted into the halo of NGC 6822. Based on the velocity distribution of ESCs, we have determined the total mass and the mass-to-light ratio of NGC 6822: M_{N6822} = 7.5^{+4.5}_{-0.1} \\times 10^{9}\\ M_{\\odot } and (M/L)_{N6822} = 75^{+45}_{-1} (M/L)_{\\odot }. It shows that NGC 6822 is one of the most dark matter dominated dwarf galaxies in the Local Group. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    13. Geodetic infrastructure at the Barcelona harbour for sea level monitoring

      NASA Astrophysics Data System (ADS)

      Martinez-Benjamin, Juan Jose; Gili, Josep; Lopez, Rogelio; Tapia, Ana; Pros, Francesc; Palau, Vicenc; Perez, Begona

      2015-04-01

      a little far away from the geographic location of the pulse and acustic radar location on the Europa bridge. The measured settlement rate is about 1cm/year that may be could mask the values registered by the tide gauge. An intercomparison of the results of the three different tide gauges is presented and discussed. These activities has been received funding of the Ministerio de Ciencia e Innovacion under Spanish National Project CGL2009-13435/CLI.

    14. The distance to the Andromeda galaxy from eclipsing binaries

      NASA Astrophysics Data System (ADS)

      Vilardell, F.; Ribas, I.; Jordi, C.; Fitzpatrick, E. L.; Guinan, E. F.

      2010-01-01

      The cosmic distance scale largely depends on distance determinations to galaxies of the Local Group. In this sense, the Andromeda galaxy (M 31) is a key rung to better constrain the cosmic distance ladder. A project was started in 1999 to firmly establish a direct and accurate distance to M 31 using eclipsing binaries (EBs). After the determination of the first direct distance to M 31 from EBs, the second direct distance to an EB system is presented: M31V J00443610+4129194. Light and radial velocity curves were obtained and fitted to derive the masses and radii of the components. The acquired spectra were combined and disentangled to determine the temperature of the components. The analysis of the studied EB resulted in a distance determination to M 31 of (m-M)0 = 24.30 ± 0.11 mag. This result, when combined with the previous distance determination to M 31, results in a distance modulus of (m-M)0 = 24.36 ± 0.08 mag (744 ± 33 kpc), fully compatible with other distance determinations to M 31. With an error of only 4%, the obtained value firmly establishes the distance to this important galaxy and represents the fulfillment of the main goal of our project. Based on observations made with the Isaac Newton Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina)Original data are only available in

    15. Star formation history of Canis Major R1. I. Wide-Field X-ray study of the young stellar population

      NASA Astrophysics Data System (ADS)

      Gregorio-Hetem, J.; Montmerle, T.; Rodrigues, C. V.; Marciotto, E.; Preibisch, T.; Zinnecker, H.

      2009-11-01

      Aims: The CMa R1 star-forming region contains several compact clusters as well as many young early-B stars. It is associated with a well-known bright rimmed nebula, the nature of which is unclear (fossil HII region or supernova remnant). To help elucidate the nature of the nebula, our goal was to reconstruct the star-formation history of the CMa R1 region, including the previously unknown older, fainter low-mass stellar population, using X-rays. Methods: We analyzed images obtained with the ROSAT satellite, covering 5 sq. deg. Complementary VRI photometry was performed with the Gemini South telescope. Colour-magnitude and colour-colour diagrams were used in conjunction with pre-main sequence evolutionary tracks to derive the masses and ages of the X-ray sources. Results: The ROSAT images show two distinct clusters. One is associated with the known optical clusters near Z CMa, to which 40 members are added. The other, which we name the “GU CMa” cluster, is new, and contains 60 members. The ROSAT sources are young stars with masses down to M_star 0.5 M_⊙, and ages up to 10 Myr. The mass functions of the two clusters are similar, but the GU CMa cluster is older than the cluster around Z CMa by at least a few Myr. Also, the GU CMa cluster is away from any molecular cloud, implying that star formation must have ceased; on the contrary (as already known), star formation is very active in the Z CMa region. Based in part on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    16. Host Galaxies of Luminous Type 2 Quasars at z ~ 0.5

      NASA Astrophysics Data System (ADS)

      Liu, Xin; Zakamska, Nadia L.; Greene, Jenny E.; Strauss, Michael A.; Krolik, Julian H.; Heckman, Timothy M.

      2009-09-01

      ), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    17. Nanosiderite is effective to alleviate iron chlorosis in sensitive plants growing on calcareous soils

      NASA Astrophysics Data System (ADS)

      Sánchez-Alcalá, I.; del Campillo, M. C.; Barrón, V.; Torrent, J.

      2012-04-01

      , siderite is readily prepared in the field, not easily leached from the soil and environmentally safe, thus constituting a good Fe fertilizer. Acknowledgments: This work was funded by the Spain's Ministerio de Ciencia e Innovación and the European Regional Development Fund (Projects AGL 2005-06691-C02-01 and AGL 2008-05053-C02-02).

    18. Complexity of Soils Porous Structure: A Simple Question

      NASA Astrophysics Data System (ADS)

      Benito, R. M.; Cardenas, J. P.; Santiago, A.; Borondo, F.; Losada, J. C.; Tarquis, A. M.; Grupo de Sistemas Complejos

      2011-12-01

      . Losada, F. Borondo , R. M. Benito, Soil porous system as heterogeneous complex network, Geoderma, 160:13-21, 2010. Santiago, A. and R. M. Benito, An extended formalism for preferential attachment in heterogeneous complex networks. Europhys. Lett. 82, 58004, 2008. Santiago, A. and R. M. Benito, Emergence of multiscaling in heterogeneous complex networks. Int. J. Mod. Phys. C 18, 1591, 2007. Santiago, A., R.M. Benito, J. P. Cárdenas, J. C. Losada, A. M. Tarquis and F. Borondo, Multiscaling of porous soils as heterogeneous complex networks. Nonl. Proc. Geophys. 15, 1-10, 2008. Funding provided by Spanish Ministerio de Ciencia e Innovacion (MICINN) through project no. AGL2010-21501/AGR is appreciated.

    19. Spatial an temporal analysis of chloride concentrations in underground water in the coastal wetland of l'Albufera, Spain

      NASA Astrophysics Data System (ADS)

      Puhakka, Evelina; Pascual-Aguilar, Juan Antonio; Andreu, Vicente

      2010-05-01

      in three cases, all found in a distance between 6000 and 10000 metres from the coast line. Two of similar relevance, one is positive (R2= 0.39) and one negative (R2 = 0.34). The divergent behaviour is possibly explained because the second one has the influence of the water of the Albufera lagoon. The third case, the most distant samples (more than 8000 metres from de coast line), shows a stronger positive trend (R2= 0.41) with a major increase in chloride concentrations in the last ten years. Acknowledgments. The authors thank the Spanish Ministerio de Ciencia e Innovación(Project CGL2008-01693/BTE).

    20. GEMINI/GeMS Observations Unveil the Structure of the Heavily Obscured Globular Cluster Liller 1.

      NASA Astrophysics Data System (ADS)

      Saracino, S.; Dalessandro, E.; Ferraro, F. R.; Lanzoni, B.; Geisler, D.; Mauro, F.; Villanova, S.; Moni Bidin, C.; Miocchi, P.; Massari, D.

      2015-06-01

      Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). Based on observations gathered with the ESO-VISTA telescope (program ID 179.B-2002).

    1. Extreme seasonal droughts and floods in Amazonia: causes, trends and impacts

      NASA Astrophysics Data System (ADS)

      Marengo, J. A.

      2015-12-01

      J. A. Marengo * and J. C. Espinoza** * Centro Nacional de Monitoramento e Alerta de Desastres Naturais, Ministério da Ciência, Tecnologia e Inovação, Sao Paulo, Brazil ** Subdirección de Ciencias de la Atmósfera e Hidrósfera (SCAH), Instituto Geofísico del Perú, Lima, Peru This paper reviews recent progress in the study and understanding of extreme seasonal events in the Amazon region, focusing on drought and floods. The review includes a history of droughts and floods in the past, in the present and some discussions on future extremes in the context of climate change and its impacts on the Amazon region. Several extreme hydrological events, some of them characterized as 'once in a century', have been reported in the Amazon region during the last decade. While abundant rainfall in various sectors of the basin has determined extreme floods along the river's main stem in 1953, 1989, 1999, 2009, 2012-2015, deficient rainfall in 1912, 1926, 1963, 1980, 1983, 1995, 1997, 1998, 2005 and 2010 has caused anomalously low river levels, and an increase in the risk and number of fires in the region, with consequences for humans. This is consistent with changes in the variability of the hydrometeorology of the basin and suggests that extreme hydrological events have been more frequent in the last two decades. Some of these intense/reduced rainfalls and subsequent floods/droughts were associated (but not exclusively) with La Niña/El Niño events. In addition, moisture transport anomalies from the tropical Atlantic into Amazonia, and from northern to southern Amazonia alter the water cycle in the region year-to-year. We also assess the impacts of such extremes on natural and human systems in the region, considering ecological, economic and societal impacts in urban and rural areas, particularly during the recent decades. In the context of the future climate change, studies show a large range of uncertainty, but suggest that drought might intensify through the 21st

    2. Main factors controlling microbial community structure, growth and activity after reclamation of a tailing pond with aided phytostabilization

      NASA Astrophysics Data System (ADS)

      Zornoza, Raúl; Acosta, José A.; Martínez-Martínez, Silvia; Faz, Ángel; Bååth, Erland

      2015-04-01

      , with increments in fungal and actinobacterial proportions with soil amending. Acknowledgements R. Zornoza acknowledges the financial support to Fundación Séneca-Agencia de Ciencia y Tecnología de la Región de Murcia (Spain).

    3. Six Common Mistakes in Conservation Priority Setting

      PubMed Central

      Game, Edward T; Kareiva, Peter; Possingham, Hugh P

      2013-01-01

      Abstract A vast number of prioritization schemes have been developed to help conservation navigate tough decisions about the allocation of finite resources. However, the application of quantitative approaches to setting priorities in conservation frequently includes mistakes that can undermine their authors’ intention to be more rigorous and scientific in the way priorities are established and resources allocated. Drawing on well-established principles of decision science, we highlight 6 mistakes commonly associated with setting priorities for conservation: not acknowledging conservation plans are prioritizations; trying to solve an ill-defined problem; not prioritizing actions; arbitrariness; hidden value judgments; and not acknowledging risk of failure. We explain these mistakes and offer a path to help conservation planners avoid making the same mistakes in future prioritizations. Seis Errores Comunes en la Definición de Prioridades de Conservación Resumen Se ha desarrollado un vasto número de esquemas de priorización para ayudar a que la conservación navegue entre decisiones difíciles en cuanto a la asignación de recursos finitos. Sin embargo, la aplicación de métodos cuantitativos para la definición de prioridades en la conservación frecuentemente incluye errores que pueden socavar la intención de sus autores de ser más rigurosos y científicos en la manera en que se establecen las prioridades y se asignan los recursos. Con base en los bien establecidos principios de la ciencia de la decisión, resaltamos seis errores comúnmente asociados con la definición de prioridades para la conservación: no reconocer que los planes de conservación son priorizaciones; tratar de resolver un problema mal definido; no priorizar acciones; arbitrariedad; juicios de valor ocultos y no reconocer el riesgo de fracasar. Explicamos estos errores y ofrecemos un camino para que planificadores de la conservación no cometan los mismos errores en priorizaciones

    4. Ferromagnet / superconductor oxide superlattices

      NASA Astrophysics Data System (ADS)

      Santamaria, Jacobo

      2006-03-01

      Energy Sciences, contract No.W-31-109-ENG-38. ^1GFMC, Departamento de F'isica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain ^2Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC). 28049 Cantoblanco. Madrid. ^3Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA ^4Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6031, USA

    5. All-Manganite Tunnel Junctions with Interface-Induced Barrier Magnetism

      NASA Astrophysics Data System (ADS)

      Sefrioui, Zouhair

      2011-03-01

      The recent discovery of several unexpected phases at complex oxide interfaces is providing new insights into the physics of strongly correlated electron systems. The possibility of tailoring the electronic structure of such interfaces has triggered a great technological drive to functionalize them into devices. In this communication, we describe an alternative strategy to produce spin filtering by inducing a ferromagnetic insulating state in an ultrathin antiferromagnetic layer in contact with a ferromagnetic layer. This artificially induced spin filtering persists up to relatively high temperatures and operates at high applied bias voltages. The results suggest that after playing a key role in exchange-bias for spin-valves, uncompensated moments at engineered antiferromagnetic interfaces represent a novel route for generating highly spin-polarized currents with antiferromagnets. Work done in collaboration with M. Bibes, C. Carrétéro, A. Barthélémy (Unité Mixte de Physique CNRS/Thales, Campus de Polytechnique, 1, Avenue A. Fresnel, 91767 Palaiseau (France) and Université Paris-Sud, 91045 Orsay (France)), F.A. Cuellar, C. Visani, A. Rivera-Calzada, , C. León, J. Santamaria (Grupo de Física de Materiales Complejos, Universidad Complutense de Madrid, 28040 Madrid (Spain)), M.J. Calderón, L. Brey (Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid (Spain)), K. March, M. Walls, D. Imhoff (Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, 91405 Orsay (France)), R. Lopez Anton, T.R. Charlton (ISIS, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX (United Kingdom)), E. Iborra (Universidad Politécnica de Madrid, Escuela Técnica Superior de Ingenieros de Telecomunicaciones, 28040 Madrid (Spain)), F. Ott (Léon Brillouin, CEA/CNRS, UMR 12, 91191 Gif-sur-Yvette (France)). This work was supported by the Spanish Ministry for Science and Education programs MAT2008 06517, and the Réseau Thématique de Recherche Avanc

    6. Recent KBO (Pluto/Charon and beyond, including Quaoar) Occultation Observations by the Williams College Team as part of the Williams-MIT Collaboration

      NASA Astrophysics Data System (ADS)

      Pasachoff, Jay M.; Babcock, B. A.; Davis, A. B.; Pandey, S.; Lu, M.; Rogosinski, Z.; Person, M. J.; Bosh, A. S.; Zangari, A. M.; Zuluaga, C. A.; Gulbis, A. S.; Naranjo, O.; Navas, G.; Zerpa, L.; Villarreal, J.; Rojo, P.; Förster, F.; Servajean, E.

      2013-10-01

      : support from FONDECYT through grant 3110042 and by the Millennium Center for Supernova Science, grant P10-064-F. funded by Programa Bicentenario de Ciencia y Tecnología de CONICYT and Programa Iniciativa Científíca Milenio de MIDEPLAN.

    7. Astronomy Teaching and Teachers Continuing Education: the Interdisciplinarity during a Total Lunar Eclipse. (Spanish Title: Enseñanza de la Astronomía y la Formación Continua de Profesores: la Interdisciplinariedad Durante un Eclipse Total de Luna.) Educação EM Astronomia E Formação Continuada de Professores: a Interdisciplinaridade Durante um Eclipse Lunar TOTAL

      NASA Astrophysics Data System (ADS)

      Langhi, Rodolfo

      2009-07-01

      This paper describes how 67 teachers from 23 cities, could awaken, in students, the scientific interest, using a natural astronomical phenomenon: a total lunar eclipse. Before and after of eclipse, meetings for continuing education were characterized by interdisciplinarity of astronomy and the importance of these observations. Working groups were formed by teachers and students, who organized the survey data, mobilizing the people in their cities. The results point ways about how to provide the scientific culture and the motivation to learn science in students, using approaches between the following communities: scientific, amateur and school. En este artículo se describe cómo 67 profesores de 23 ciudades, despertó el interés científico en los estudiantes mediante un fenómeno astronómico: un eclipse total de Luna. Antes y después del eclipse, reuniones para la formación continua se centraron en la interdisciplinariedad de la astronomía, y la importancia de las observaciones de este tipo de fenómeno. Profesores y estudiantes formaron grupos de trabajo para investigar datos durante el eclipse, con el participación de la comunidad en sus ciudades. Los resultados apuntan a las opciones que conducen a la cultura científica y la motivación para aprender la ciencia, utilizando las relaciones de los siguientes grupos: científicos, aficionados y la escuela. Este texto relata como 67 professores, provenientes de 23 cidades, puderam despertar, nos alunos, o interesse científico utilizando um fenômeno natural astronômico: um eclipse lunar total. O evento foi precedido e procedido por encontros de formação continuada, onde se caracterizou a interdisciplinaridade da astronomia e a importância das observações de fenômenos como estes. Grupos de trabalho foram formados por professores e alunos, que se organizaram para o levantamento conjunto de dados durante o fenômeno, além do envolvimento da comunidade em suas respectivas cidades. Os resultados apontam

    8. Coordination of NEO Observers in South-America

      NASA Astrophysics Data System (ADS)

      Tancredi, G.

      At present the discovery of NEOs is concentrated in the Northern Hemisphere. None of the 6 existing survey programs can reach declinations below -30deg. Nevertheless, there are two small surveys ready to start in the near future in the southern hemisphere: an extension of the Catalina Sky Survey using the Uppsala Schmidt in Siding Spring and the Project BUSCA in Uruguay. Many of the NEOs discovered by the northern surveys could reach the southern sky, with declinations unreachable for a northern observer. Furthermore, the recovery of an asteroid in subsequent oppositions could come indistinctly in the northern and southern sky. A network of well-equipped observers in the southern region is then a must in a campaign to catalog the NEO population. In view of this situation, the Planetary Society, through its NEO grant, have already supported many observers in the Southern Hemisphere. The planetary science community in South America has considerably grown in the last 10 years. We have well-known research groups in Argentina, Brazil and Uruguay. Those groups have established many scientific links by exchanging graduate students and through several meetings. In particular, we have already hold two Workshop in Planetary Science in South America in 1999 (La Plata, Argentina) and 2000 (Montevideo, Uruguay) with more than 25 participants each. Recently, in February 2002, we organized a Workshop of NEO observers in Montevideo with the participation of more than 20 professional and amateurs observers from: Argentina: Obs. Ast. Felix Aguilar - Yale University (San Juan) and CRICYT (Mendoza); Brazil: Obs. Abraes de Moraes (San Pablo), Obs. Wykrota (Belo Horizonte) and Observatorio Nacional (Rio de Janeiro); Paraguay: Obs. Nacional de Asuncion and Sociedad de Estudios Astronómicos (Asunción) Uruguay: Depto. Astronomía - Fac. Ciencias, Obs. Ast. Los Molinos and Obs. Kappa Crucis (Montevideo). Among the resolutions of the Workshop, we highlight: * Creation of the "Asociaci

    9. Macroclumping as solution of the discrepancy between Hα and P v mass loss diagnostics for O-type stars

      NASA Astrophysics Data System (ADS)

      Šurlan, B.; Hamann, W.-R.; Aret, A.; Kubát, J.; Oskinova, L. M.; Torres, A. F.

      2013-11-01

      observations collected with the Perek 2-m Telescope of the Ondřejov Observatory, Czech Republic.Based on observations taken at the Complejo Astronómico El Leoncito (CASLEO), operated under an agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, the Secretaría de Ciencia y Tecnología de la Nación, and the National Universities of La Plata, Córdoba, and San Juan.Appendix A is available in electronic form at http://www.aanda.org

    10. [Latin American malacology. Freshwater mollusks from Argentina].

      PubMed

      Rumi, Alejandra; Gregoric, Diego E Gutiérrez; Núñez, Verónica; Darrigran, Gustavo A

      2008-03-01

      A report and an updated list with comments on the species of freshwater molluscs of Argentina which covers an area of 2 777 815 km2 is presented. Distributions of Gastropoda and Bivalvia families, endemic, exotic, invasive as well as entities of sanitary importance are also studied and recommendations on their conservation are provided. Molluscs related to the Del Plata Basin have been thoroughly studied in comparison to others areas of the country. This fauna exhibits relatively the biggest specific richness and keeps its affinity with the fauna of other regions of the basin in areas of Paraguay and Brasil. The 4 500 records of molluscs considered in this paper arise from the study of the collections of Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires; Museo de La Plata, La Plata and Fundación "Miguel Lillo", Tucumán. These institutions keep very important collections of molluscs in southern South America. Field information has recently been obtained and localities cited by other authors are also included in the data base. Until today, 166 species have been described, 101 belonging to 10 families of Gastropoda and 65 to 7 of Bivalvia. Families with highest specific richness are Lithoglyphidae (22) and Sphaeriidae (25), respectively. The number of endemic species (those present only in Argentina) by family is: Gastropoda: Ampullariidae (1), Cochliopidae (10), Lithoglyphidae (11), Thiariidae (3), Chilinidae (11), Lymnaeidae (2) and Physidae (2?); Bivalvia: Hyriidae (1?); Etheriidae (1?) and Sphaeriidae (10). Families with a distribution that comprise almost the whole country are: the Sphaeriidae and the gastropods Cochliopidae, Chilinidae and Lymnaeidae. Families Erodonidae and Solecurtidae (Bivalvia) were registered in mixohaline environments from Buenos Aires province. Gastropod families Thiaridae and Glacidorbiidae show a very restricted distribution. The rest of the families are present mainly in the center and north of the country

    11. Descripción del coronógrafo a ser instalado en Argentina (MICA)

      NASA Astrophysics Data System (ADS)

      Stenborg, G.; Francile, C.; Schwenn, R.; Epple, A.; Rovira, M.

      El ``Coronógrafo de espejo para Argentina'' es un telescopio solar terrestre a ser colocado en el Observatorio Astronómico Félix Aguilar (El Leoncito), antes de finalizar 1996, como parte de un programa de ciencia bilateral entre Alemania y Argentina. Eclipses fotográficos de alta resolución han revelado que la corona solar es altamente estructurada y variable. De hecho, está contínuamente deformada y moldeada por los movimientos convectivos de los extremos de los arcos magnéticos en la fotosfera, estando, en muchas oportunidades, afectada por explosivas liberaciones de energía. MICA, en conjunción con otros telescopios solares espaciales y terrestres, tratará de contribuir al entendimiento de cuestiones fundamentales de la física solar. Entre ellas: cómo la corona está siendo calentada, dónde y cómo el viento solar es acelerado, qué causa los transitorios coronales, etc. Para ello investigará la distribución de los parámetros del plasma y su evolución con el tiempo, la estructura espacial de la corona en fina y gran escala, procesos que ocurren en los transitorios coronales y factores que los disparan, etc. Para responder a estas cuestiones MICA observará la atmósfera solar por sobre el limbo entre 1.1 y 2 radios solares aproximadamente, usando un nuevo tipo de sistema coronográfico que permite suprimir el brillo del disco solar suficientemente bien, tomando las imágenes con una cámara CCD de 1024x1024 pixels, codificada en 12 bits, pudiendo el mismo ser operado en forma remota. En la presente exposición describiremos las características del instrumento, cómo será controlado y qué esperamos observar basados en las imágenes obtenidas por los telescopios de similares características LASCO C1 a bordo del SOHO y PICO (ubicado en el Observatorio de Pic du Midi, Francia).

    12. The Reflective Abstraction Theory and the History of Astronomy. (Spanish Title: La Teoría de la Abstracción Reflexionante y la Historia de la Astronomía.) A Teoria da Abstração Reflexionante e a História da Astronomia.

      NASA Astrophysics Data System (ADS)

      Chiesa Bartelmebs, Roberta; Batista Siqueira Harres, João; da Silva, João Alberto

      2014-12-01

      This work is presented as a theoretical essay on some facts from the history of astronomy analyzed according to the theory of reflective abstraction developed by Jean Piaget and collaborators (1970). Its aim is to understand the reasons that led to different astronomers, at the same historical period and culture, to "see" quite different evidences about the same phenomenon. In addition, we intend to facilitate the understanding of science as a human construction, subject to a time epoch and the ways of understanding of each scientist. Este trabajo se presenta como un ensayo teórico sobre algunos hechos históricos de la astronomía, analizados según la teoría de la abstracción reflexionante de Jean Piaget y sus colaboradores (1970). Se trata de comprender los motivos que llevaran a distintos astrónomos, de una misma época histórica y cultural, a "ver" diferentes evidencias sobre un mismo fenómeno. Además, se intenta posibilitar la comprensión de la ciencia como construcción humana, la cual es condicionada por su momento histórico y por las creencias y las formas de entender de los científicos. Este trabalho configura-se como um ensaio teórico a respeito de alguns fatos da história da astronomia analisados segundo a teoria da abstração reflexionante elaborada por Jean Piaget e seus colaboradores (1970). Trata-se de compreender os motivos que levaram diferentes astrônomos, da mesma época histórica e cultural, a "enxergarem" evidências tão diferentes sobre um mesmo fenômeno. Além disso, pretendemos possibilitar a compreensão das Ciências como construção humana, condicionadas a uma época e às crenças e os modos de compreender de cada cientista.

    13. PREFACE: FLUIDOS 2010: XI Meeting on Recent Advances in the Physics of Fluids and their Applications

      NASA Astrophysics Data System (ADS)

      Bove, Italo; Cabeza, Cecilia; Martí, Arturo C.; Sarasúa, Gustavo

      2011-04-01

      The papers published in this volume of the Journal of Physics: Conference Series were selected from the manuscripts submitted to the XI Meeting on Recent Advances in the Physics of Fluids and their Applications (FLUIDOS2010), which was held in Colonia del Sacramento, Uruguay, 3-5 November 2010. FLUIDOS takes place every two years, usually in November, with the aim of gathering together researchers from all areas of the Physics of Fluids, to update themselves on the latest technical developments and applications, share knowledge and stimulate new ideas. This 11th meeting continues the successful experience of the previous ones which were held in different Argentinian cities. For the first time, the meeting was celebrated in Uruguay, more specifically, in the peaceful town of Colonia del Sacramento, designated a World Heritage Site by UNESCO. The conference presented an outstanding program of papers covering the most recent advances in Physics of Fluids in the following areas: General Fluid Dynamics General and non-Newtonian Flows Magnetohydrodynamics Electrohydrodynamics and Plasmas Hydraulics, Thermohydraulics and Multiple Phase Flows A website with full details of the conference program, abstracts and other information can be found at http://fluidos2010.fisica.edu.uy. We would like to thank all the participants, especially those who contributed with talks, posters and manuscripts, for making FLUDOS2010 such a successful conference. Our thanks also go to our colleagues for their support and encouragement, particularly in the refereeing of papers. We would like to acknowledge additional financial support from Comisión Sectorial de Investigación Científica (Universidad de la República, Uruguay), Programa de Desarrollo de las Ciencias Básicas (Uruguay) and the Centro Latinoamericano de Física (CLAF). Our thanks are extended to the local government of Colonia del Sacramento. The next FLUIDOS conference will be held in November 2013, in Buenos Aires, Argentina. We

    14. [Who finances medical research in Chile?].

      PubMed

      Reyes, H; Kauffmann, R; Goic, A

      1995-10-01

      To identify those institutions granting medical research in Chile, every issue of Revista Médica de Chile published between 1987 and 1994 was reviewed, under the assumption that a vast majority (over 70%) of papers released by Chilean authors in topics of internal medicine and related subspecialties would have been submitted for publication in this journal. This assumption was based in the solid prestige of Revista Médica de Chile among Chilean physicians and investigators: it is one of the oldest medical journals in the world (founded in 1872) and its inclusion in the most important international indexes (e.g. Index Medicus, Current Contents) qualifies it in the "mainstream literature". Papers classified as "Original Articles", "Clinical Experiences", "Review Articles", "Public Health", "Case Reports", "Clinical Laboratory", "Special Articles" and "Medical Education" were screened for acknowledgment of financial support beyond the resources needed for routine clinical work. Among 1,528 manuscripts published, 344 were "Original Articles" and 61.3% of them acknowledged special financial support. Five hundred and one manuscripts were "Clinical Experiences" and 21.5% of them received special financial support; similar proportions were detected in "Review Articles" and "Public Health" topics. The institution ranked as providing support most often was the "Fondo Nacional de Ciencias y Tecnología" (FONDECYT), a governmental fund that assigns resources to research in all areas of science and technology through a peer-reviewed nationwide annual contest. FONDECYT was identified as provider of financial support to 45.2% of the "Original Articles" and "Clinical Experiences"; Chilean universities were mentioned by 33.6% and other entities (including pharmaceutical companies, other national and foreign organizations) by 23.1%. The University of Chile was the main Chilean university mentioned in the acknowledgments. The proportion of papers receiving special financial support

    15. PREFACE: The IX Mexican Workshop on Particles and Fields

      NASA Astrophysics Data System (ADS)

      Amore, Paolo; Aranda, Alfredo; Bashir, Adnan; Mondragón, Myriam; Raya, Alfredo

      2006-05-01

      The IX Mexican Workshop on Particles and Fields was held in the beautiful city of Colima, in the South-West of Mexico, from 17-22 November 2003. The proceedings of the Workshop were delayed due to problems with a previous publisher, we are very grateful that Journal of Physics: Conference Series kindly agreed to publish the proceedings rapidly at this late stage. The Workshop aimed to cover, through invited lectures delivered by internationally known experts, the most recent developments in the field. There was also a series of short seminars as well as a poster session, which allowed the whole community to participate with their most recent research results. A special session was dedicated to awarding the Division Medal to Professor Benjamin Grinstein, from The University of California, San Diego, for his outstanding contributions to the field. This volume contains the written version of the material presented at the Workshop. The Workshop was attended by more than 100 participants, including faculty members, postdocs and graduate students. It was organized by the Particles and Fields Division of the Mexican Physical Society, and generously sponsored by several institutions: Universidad de Colima, Universidad Nacional Autónoma de México, Universidad Michoacana de San Nicolás Hidalgo, Centro de Investigaciones y Estudios Avanzados del IPN (CINVESTAV), Consejo Nacional de Ciencia y Tecnología (Conacyt). The Local Organizing Committee was integrated by Paolo Amore, Alfredo Aranda, Carlos Moisés Hernóndez Suórez (Director of the Physics Faculty), Arturo Gonzólez Larios, Enrique Farías Martínez, and Myriam Cruz Calvario, all from the University of Colima. The members of the National Organizing Committee were Adnan Bashir (IFM-UMSHN), Jens Erler (IF-UNAM), Heriberto Castilla Valdés (CINVESTAV-U.Zacatenco), Gabriel López Castro (CINVESTAV-U.Zacatenco), Myriam Mondragón (IF-UNAM) and Luis Villaseñ or (IFM-UMSHN). We gratefully acknowledge the help given by

    16. Remontant erosion in desert soils of Tamaulipas, México.

      NASA Astrophysics Data System (ADS)

      Rivera-Ortiz, P.; Andrade-Limas, E.; De la Garza-Requena, F.; Castro-Meza, B.

      2012-04-01

      REMONTANT EROSION IN DESERT SOILS OF TAMAULIPAS MÉXICO Rivera-Ortiz, P.1; Andrade-Limas, E.1; De la Garza-Requena, F.1 and Castro-Meza, B.1 1Facultad de Ingeniería y Ciencias, Universidad Autónoma de Tamaulipas, México The degradation of soil reduces the capacity of soils to produce food and sustain life. Erosion is one of the main types of soil degradation. Hydric erosion of remontant type can occur in soils located close to the channel of a river through the expansion of a gully that begins as a fluvial incision over the ravine of one side of the river. The incision takes place at the point of greatest flow of runoff from areas adjacent to empty into the river. The depth of the incision causes the growth of the gully by collapse to move their heads back, upstream. The soil loss by remontant erosion on land use in agriculture and livestock was estimated in order to understand the evolution of gullies formed by this type of erosion. Through measurements on satellite images and GPS (Global Positioning System) two gullies, developed on alluvial soils which drain into the river Chihue, were studied. The investigation was conducted during 2003 to 2010 period in the municipality of Jaumave, Tamaulipas, in northeastern Mexico. Soil loss in gullies developed by remontant erosion was large and it was caused by soil collapse and drag of soil on the headers. The estimated loss of soil by remontant erosion was 3500 t in the deeper gully during 2010 and nearly 1200 t per year in the period 2003-2009. New sections of gully of about 20 m length, with more than 3 m deep and up to 13 m wide, were formed each year. This degradation has significantly reduced the productive surface of soil that for many years has been used to the cultivation of maize (Zea mays) and beans (Phaseolus vulgaris) as well as pasture production.

    17. PREFACE: First International Meeting on Applied Physics (APHYS-2003)

      NASA Astrophysics Data System (ADS)

      Méndez-Vilas, A.; Chacón, R.

      2005-01-01

      University of Extremadura, for their support, and the Regional Government (Junta de Extremadura/Consejería de Educación, Ciencia y Tecnología), as well as INNOVA Instrumentación, for sponsoring the Conference.

    18. Booklets for children related with Earth Sciences published in Mexico

      NASA Astrophysics Data System (ADS)

      Alaniz, S. A.; Nieto-Samaniego, A. F.

      2009-04-01

      experiments, how the Earth's rotation influences climate. 5. "The Earth and its waves". This booklet presents seven experiments to explain how the knowledge of the wave behavior help us to understand phenomena like tsunamis, earthquakes, colors and telecommunications, etc. All the booklets are in Spanish, printing was sponsored by the Academia Mexicana de Ciencias, the Universidad Nacional Autonoma de Mexico among other institutions. We will bring to the EGU General Assembly some booklets to see if any institution is interested in publishing and distribute them in another language.

    19. 15 Years of Ocean Education and Outreach Activities by the College of Exploration.

      NASA Astrophysics Data System (ADS)

      Tuddenham, P.; Bishop, K.

      2012-04-01

      Since 1997 the College of Exploration has created ocean related interactive and engaging online and onsite education and outreach programs that have reached over 15,000 particpants in over 30 countries. Partners and funders have included in the USA the National Oceanic and Atmospheric Administration (NOAA), NASA, the National Science Foundation (NSF), National Geographic, and many others. In the UK the Natural Environment Research Council and the National Oceanography Center, and in Europe Portugal's Ciencia Viva. The first online and onsite program was in partnership with the now Bermuda Institute for Ocean Sciences. With funding from NSF the project took the online Bermuda Atlanic Time Series (BATS) dataset and made it more accessible to teachers and students in a custom spreadsheet with easier to use macros and graphs. Online training and workshops helped teachers learn more about using BATS in the classroom. The next project in 1998 in partnership with the University of Southern California Sea Grant was an online workshop on El Nino. This was one of the first teacher professional development projecs offered online. Scientists with expertise in El Nino were able to meet and discuss with teachers. Over the past 15 years there have numerous programs, workshops and activities on topics such as Autosub Under Ice, Ocean Exploration then,now and the future, Ocean Observing Systems, Harmful Algal Blooms, Coral Reefs, and much more. These will be summarized. Every activity has been evaluated and assessed. The cumulative results of these evaluations will be presented along with the results of a recent survey of all participants over the past 15 years. Since 2002 the College of Exploration has played a key role in the development and promotion of the Ocean Literacy campaign, an effort to bring innovative approaches to promoting the ocean in K-12 education as well integrating the ocean into national standards and curriculum and promoting the ocean to the general public. A

    20. Comparison of NDVI fields obtained from different remote sensors

      NASA Astrophysics Data System (ADS)

      Escribano Rodriguez, Juan; Alonso, Carmelo; Tarquis, Ana Maria; Benito, Rosa Maria; Hernandez Díaz-Ambrona, Carlos

      2013-04-01

      reduced cost. By contranst, MODIS images present a much lower spatial resolution (500x500 m). The aim of this study is to establish a comparison between two different sensors in their NDVI values at different spatial resolutions. Acknowledgements. This work was partially supported by ENESA under project P10 0220C-823. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. MTM2009-14621 and i-MATH No. CSD2006-00032 is greatly appreciated.

    1. Pasture Drought Insurance Based on NDVI and SAVI

      NASA Astrophysics Data System (ADS)

      Escribano Rodríguez, J. A.; Tarquis, A. M.; Hernandez Díaz-Ambrona, C. G.

      2012-04-01

      obtaining Earth images with a good enough resolution to study the terrestrial vegetation cover (20x20 m), although with a great range of visual field (600 km) in order to obtain those images with high temporal resolution and at a reduced cost. It has 6 cameras in red, green and near infrared bands, equivalent to Landsat ones. A discussion on the correlations found between field measurements and both vegetation index considering seasonal pattern and location are presented. Acknowledgements. This work was partially supported by ENESA under project P10 0220C-823. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    2. Sunspots and the Newcomb-Benford Law. (Spanish Title: Manchas Solares y la Ley de Newcomb-Benford.) Manchas Solares e a Lei de Newcomb-Benford

      NASA Astrophysics Data System (ADS)

      Alves, Mauro A.; Lyra, Cássia S.

      2008-12-01

      The Newcomb-Benford's Law (LNB) of first digits is introduced to high school students in an extracurricular activity through the study of sunspots. The LNB establishes that the first digits of various sets of data describing natural occurrences are not distributed uniformly, but according to a logarithmic distribution of probability. The LNB is counter-intuitive and is a good example of how mathematics applied to the study of natural phenomena can provide surprising and unexpected results serving also as a motivating agent in the study of physical sciences. En este trabajo se describe una actividad extracurricular donde se presenta a los estudiantes la ley de los primeros dígitos de Newcomb-Benford (LNB) con el estudio de manchas solares. La LNB establece que los primeros dígitos de algunos tipos de dados de ocurrencia natural no están distribuidos en manera uniforme, pero sí de acuerdo con una distribución logarítmica de probabilidad. La LNB es contra-intuitiva y es un excelente ejemplo de como las matemáticas aplicadas al estudio de fenómenos naturales pueden sorprender al estudiante, sirviendo también como elemento motivador en la educación de ciencias y de matemáticas. Este trabalho descreve uma atividade extracurricular na qual a lei dos primeiros dígitos de Newcomb-Benford (LNB) é introduzida a estudantes através do estudo de manchas solares. A LNB estabelece que os primeiros dígitos de vários tipos de conjunto de dados de ocorrência natural não são distribuídos de maneira uniforme, mas sim de acordo com uma distribuição logarítmica de probabilidade. A LNB é contra-intuitiva e é um ótimo exemplo de como a matemática aplicada ao estudo de fenômenos naturais pode fornecer resultados surpreendentes e inesperados, servindo também como um agente motivador no ensino de ciências e matemática.

    3. On the Formation of a Study Group to the Realization of Workshops for Teachers: Astronomy in Basic Education in Umuarama-Pr (Spanish Title: De la Formación de un Grupo de Estudios a la Realización de los Talleres Para los Profesores: la Astronomía en la Educación Básica en Umuarama-Pr ) Da Formação de um Grupo de Estudos À Realização de Oficinas Para Professores: a Astronomia na Educação Básica em Umuarama-Pr

      NASA Astrophysics Data System (ADS)

      Belusso, Diane; Akira Sakai, Otávio

      2013-12-01

      In this article, we aimed to present the activities developed by the Astronomy Study Group (ASG) to contribute to the dissemination and improvement of the astronomy teaching-learning. The results of a research carried out in schools of Umuarama-PR are shown, with the intention of checking the students' knowledge and interest in relation to Astronomy. It is reported the realization of workshops for Science teachers linked to the Education Regional Nucleus. The research and the workshop execution promoted the direct contact of the study group with the community; the results were used to diagnose the state of astronomy teaching-learning, in the basic education in Umuarama-PR. En este artículo se intenta presentar las actividades desarrolladas por el Grupo de Estudios de Astronomía (GEA) y contribuir para la divulgación y mejoría de la enseñanza-aprendizaje de la Astronomía. Se presentan los resultados de una investigación realizada en las escuelas de Umuarama-PR, con la intención de determinar el grado de conocimiento y el interés de los estudiantes en relación a la astronomía. Se relata la realización de talleres de capacitación para los profesores de ciencias vinculados al Núcleo Regional del Educación. La ejecución de la investigación y de los talleres promovió el contacto directo del grupo de estudios con la comunidad; los resultados sirvieron de diagnóstico de la enseñanza aprendizaje de la astronomía en la educación básica en Umuarama-PR. Neste artigo, objetiva-se apresentar as atividades desenvolvidas pelo Grupo de Estudos de Astronomia (GEA) e contribuir para a divulgação e melhoria do ensino-aprendizagem de astronomia. São apresentados os resultados de uma pesquisa realizada nas escolas de Umuarama-PR, com o intuito de averiguar o conhecimento e o interesse dos estudantes em relação à astronomia. Relata-se a realização de oficinas de capacitação para professores de ciências vinculados ao Núcleo Regional de Educação. A

    4. Microbial populations in contaminant plumes

      NASA Astrophysics Data System (ADS)

      Haack, Sheridan K.; Bekins, Barbara A.

      phénomènes hydrogéologiques et microbiologiques des environnements souterrains. Ces contraintes pratiques sont dues à des contradictions entre les échelles d'étude de l'hydrogéologie et de la microbiologie et à des limitations pratiques sur la capacitéà définir avec précision les populations microbiennes dans les échantillons. Cependant, des progrès dans l'application de méthodes d'échantillonnage à l'échelle locale et des approches pluridisciplinaires des études de terrain ont commencéà améliorer de façon significative notre compréhension des interactions hydrogéologiques et microbiologiques. De plus, les analyses moléculaires et sur les cultures des populations microbiennes présentes dans les panaches de pollution souterraine ont mis en évidence une adaptation significative de ces populations aux conditions environnementales du panache. Les résultats d'études récentes laissent penser que la variabilité des conditions géochimiques et hydrologiques souterraines influence significativement la structure des communautés microbiennes souterraines. Des recherches combinées sur les conditions de terrain et sur la structure des communautés microbiennes apportent les informations nécessaires à la compréhension des interactions entre les populations microbiennes souterraines, la géochimie du panache et la biodégradation du polluant. Para que la biodegradación de los contaminantes en el subsuelo sea eficiente se requiere: (1) una población microbiana con capacidad de degradación y (2) unas condiciones hidrológicas y geoquímicas favorables. Las restricciones de tipo práctico en los diseños y la interpretación de experimentos, tanto hidrogeológicos como microbiológicos, han dado lugar a un conocimiento limitado de la interrelación entre estas dos ciencias por lo que respecta al subsuelo. Estas restricciones incluyen: (1) inconsistencias entre las escalas de investigación en ambas ciencias (hidrogeología y microbiología) y (2

    5. 2nd Iberian Nuclear Astrophysics Meeting on Compact Stars

      NASA Astrophysics Data System (ADS)

      Perez-Garcia, M. Angeles; Pons, Jose; Albertus, C.

      2012-02-01

      experts from the computational simulation of core-collapse supernovae and the effect of hadron-quark phase transitions developed specialized review talks. Prospects in future observations or a more dilute classification of magnetars were also discussed. The importance of the equation of state, three-body forces, finite nuclei, phenomenological fermionic interaction models, and the microphysics inputs of different many-body approaches to some very important quantities as the symmetry energy were reviewed and discussed from either the non-relativistic to the relativistic framework. The importance of the crust with the existence of a crystallized structure and vortex-crust pinning were some of the important subjects discussed in the context of cooling and field dynamics. Finally, some condensed matter and optics talks presented us the rich insight that Cold Atom Physics can give us on low-density interactions and the new and very intense laser Petawatt beams can test matter under strong external fields, respectively. We would to thank the Faculty of Science and University of Salamanca for hosting the meeting. We also thank for partial financial support the European ERC Network COMPSTAR, The Physics of Neutron Stars under reference 3803 and the Spanish Ministerio de Ciencia e Innovación (MICINN) with project FIS2011-14759 and the local institutions of Instituto de Física Fundamental y Matemáticas (IUFFYM) and Universidad de Salamanca, Spain. Of course we thank those who have contributed to make this meeting a nice occasion to gather and start to develop fruitful collaborations. To them go our grateful acknowledgments. December 2011, Salamanca,Spain M Ángeles Pérez-García, J A Miralles, J Pons, C Albertus, F Atrio Organizing Committee of II Iberian Nuclear Astrophysics Meeting SPONSOR OR FUNDING ACKNOWLEDGMENTS European ERC Network COMPSTAR, The Physics of Neutron Stars under meeting ref. 3803 COMPSTAR logo Spanish Ministerio de Ciencia e Innovación (MICINN) with

    6. 2nd Iberian Nuclear Astrophysics Meeting on Compact Stars

      NASA Astrophysics Data System (ADS)

      Perez-Garcia, M. Angeles; Pons, Jose; Albertus, C.

      2012-02-01

      experts from the computational simulation of core-collapse supernovae and the effect of hadron-quark phase transitions developed specialized review talks. Prospects in future observations or a more dilute classification of magnetars were also discussed. The importance of the equation of state, three-body forces, finite nuclei, phenomenological fermionic interaction models, and the microphysics inputs of different many-body approaches to some very important quantities as the symmetry energy were reviewed and discussed from either the non-relativistic to the relativistic framework. The importance of the crust with the existence of a crystallized structure and vortex-crust pinning were some of the important subjects discussed in the context of cooling and field dynamics. Finally, some condensed matter and optics talks presented us the rich insight that Cold Atom Physics can give us on low-density interactions and the new and very intense laser Petawatt beams can test matter under strong external fields, respectively. We would to thank the Faculty of Science and University of Salamanca for hosting the meeting. We also thank for partial financial support the European ERC Network COMPSTAR, The Physics of Neutron Stars under reference 3803 and the Spanish Ministerio de Ciencia e Innovación (MICINN) with project FIS2011-14759 and the local institutions of Instituto de Física Fundamental y Matemáticas (IUFFYM) and Universidad de Salamanca, Spain. Of course we thank those who have contributed to make this meeting a nice occasion to gather and start to develop fruitful collaborations. To them go our grateful acknowledgments. December 2011, Salamanca,Spain M Ángeles Pérez-García, J A Miralles, J Pons, C Albertus, F Atrio Organizing Committee of II Iberian Nuclear Astrophysics Meeting SPONSOR OR FUNDING ACKNOWLEDGMENTS European ERC Network COMPSTAR, The Physics of Neutron Stars under meeting ref. 3803 COMPSTAR logo Spanish Ministerio de Ciencia e Innovación (MICINN) with

    7. PREFACE: XII Latin American workshop on plasma physics (17-21 September 2007, Caracas, Venezuela)

      NASA Astrophysics Data System (ADS)

      Puerta, Julio

      2008-10-01

      ller, Laura Beiras, Juan Contreras, Gabriel Torrente, Aimée Guerrero, Francisco Jose Blanco Tovar, and last but not least, my son Johann Puerta. Without their generous help and great effort, it would have been impossible for me to organize, reach all the goals and finally, successfully realize the workshop. We are also grateful for the financial support of CLAF (Centro Latino American de Fisica), Fonacit (Fondo Nacional de Ciencia Investigacion y Tecnología), IVIC (Instituto Venezolano de Investigaciones Cientificos), Fundacion Banco Mercantil, whose sponsorship and finnacial support were vital to the realization of the event. We would like to thank La Universidad del Zulia, Universidad Central de Venezuela, Instituto Universitario de Tecnología, IDEA (Instituto de Estudios Avanzados), and Asociación de Amigos de la Universidad Simón Bolivar for their help and support in different ways for the good results we achieved in most of the meetings and the participation of their students who attend the Workshops. Finally we appreciate very much the Ministry for Science and Technology (Ministerio del Poder Popular para la Ciencia y la Tecnología) for their contribution to the workshops and to the publication process. We are under the impression that our meeting was successful, as we expected, and we are thankful for the collaboration of our Institution, and the close relation we had with all the physics researchers of Latin America and abroad (Europe, USA, Australia and Russia). Lastly, many thanks to the invited speakers for their lectures presented which have given a whole overview of the state of the art in different areas of the Physics of Plasma.

    8. PREFACE: The XI Mexican School on Particles and Fields

      NASA Astrophysics Data System (ADS)

      2005-01-01

      The XI Mexican School on Particles and Fields took place on 2-13 August 2004, in the city of Xalapa, Veracruz, México. The School continued with the tradition of promoting High Energy Physics among the younger generation in Mexico. Thus, it was aimed specifically at graduate students and postdocs. The School consisted of several courses delivered by international experts on subjects of current interest to the scientific community. The length of each course was of six to eight hours, English being the language of instruction. A novelty in this edition of the School was its total duration (two weeks as opposed to one), the number of hours assigned to one subject, and the addition of some experimental courses for the students to overcome their inhibitions of a direct encounter with the equipment and its usage. There were also a few overview talks delivered by local experts on the current status of some of the research fields actively pursued in Mexico. The XI-MSPF was organized by the Particles and Fields Division of the Mexican Physical Society. It was generously sponsored by several institutions: Universidad de Veracruz, Universidad Nacional Autónoma de México, Universidad Michoacana de San Nicolás de Hidalgo, Centro de Investigaciones y Estudios Avanzados del IPN (CINVESTAV) and Consejo Nacional de Ciencia y Tecnología (CONACyT). We are very grateful to Dr Raúl Arias Lovillo, Dr Víctor Manuel Alcaráz Romero, Dr Asdrúbal Flóres López and Mtro Walter Saiz González, head of the Academic Secretariat, Director and Subdirector of the Office of Scientific Research and Director of the Division of Exact Sciences of the University of Veracruz, respectively, for their invaluable support in all senses to our Summer School. We also appreciate the important and useful assistance provided by Dr Rubén Bernardo Morante López, Director of the Museum of Anthropology of Xalapa, and Dr Héctor Coronel Brizio of the Secretariat of Education and Culture of the state of

    9. PREFACE: 14th Latin American Workshop on Plasma Physics (LAWPP 2011)

      NASA Astrophysics Data System (ADS)

      Bilbao, Luis; Minotti, Fernando; Kelly, Hector

      2012-06-01

      , Venezuela Leopoldo Soto, Chile Michael Tendler, Sweden Carlos Varandas, Portugal Henry Riascos, Colombia Ivan Vargas-Blanco, Costa Rica Local Organizing Committee Luis Bilbao (Chairman) Fernando Minotti (Vice-Chairman) Luis Bernal, UNMDP Alejandro Clausse, PLADEMA-CNEA Graciela Gnavi, INFIP, CONICET-UBA Fausto Gratton, INFIP, CONICET-UBA Diana Grondona, INFIP, CONICET-UBA Héctor Kelly, INFIP, CONICET-UBA Adriana Márquez, INFIP, CONICET-UBA María Milanese, UNCPBA César Moreno, INFIP, CONICET-UBA Sponsors Instituto de Física del Plasma (INFIP) Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Comisión Nacional de Energía Atómica (CNEA) Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) Centro Latino-Americano de Física (CLAF) Universidad Nacional de Mar del Plata (UNMP) Universidad Nacional del Centro de la Provincia de Buenos Aires (UNICEN) Academia Nacional de Ciencias de Buenos Aires (ANCBA) Conference poster

    10. PREFACE: International Conference on Optics of Excitons in Confined Systems

      NASA Astrophysics Data System (ADS)

      Viña, Luis; Tejedor, Carlos; Calleja, José M.

      2010-01-01

      ), France (41), Spain (33), UK (24), Switzerland (21), Italy (14), The Netherlands (12), USA (11), other (23). The conference was made possible by generous sponsors, whom we thank earnestly: Universidad Autónoma de Madrid, Spanish Ministry of 'Educación y Ciencia', Consejo Superior de Investigaciones Científicas, European Union (ITN- 235114), Europhysics Letters, Semiconductor Science and Technology, Consolider Research Project 'Quantum Optical Information Technology', Lasing S A, Newport, Innova Scientific, Foundation Madrid-2016 and European Physical Society. We would like to acknowledge the members of the Organizing and Program Committees, who are responsible for the success of the Conference (names are listed below). Finally, the authors are thanked for the quality of their contributions. Luis Viña Carlos Tejedor José M Calleja EDITORS Organizing Committee Luis Viña-Chair, Universidad Autónoma de Madrid María D Martín-Scientific Secretary, Universidad Autónoma de Madrid José M Calleja, Universidad Autónoma de Madrid Luisa González, Instituto de Microelectrónica de Madrid Herko van der Meulen, Universidad Autónoma de Madrid Enrique Calleja, Instituto de Sistemas Optoelectrónicos y Microtecnología Madrid Daniele Sanvitto, Universidad Autónoma de Madrid Program Committee Carlos Tejedor-Chair, Universidad Autónoma de Madrid Israel Bar-Joseph, Weizmann Institute of Science Jeremy J Baumberg, Cambridge University Manfred Bayer, Universität Dortmund Jacqueline Bloch, Laboratoire de Photonique et de Nanostructures - CNRS Wolfgang Langbein, Cardiff University Marek Potemski, Grenoble High Magnetic Field Laboratory Antonio Quattropani, Ecole Polytechnique Fédérale de Lausanne Salvatore Savasta, Università di Messina Vincenzo Savona, Ecole Polytechnique Fédérale de Lausanne David Snoke, University of Pittsburgh Jerome Tignon, Ecole Normale Superieure Paris

    11. Miguel Sánchez Peña (1925-2009) organizer of the space activities in Argentina

      NASA Astrophysics Data System (ADS)

      de León, Pablo; Sánchez Peña, Miguel Alejandro

      2011-11-01

      Astronautics. After leaving CNIE he became president of the Asociación Argentina de Ciencias Espaciales (AACE), an IAF Member organization which was the continuation of the space organization created by Teófilo Tabanera in 1951. Miguel Sánchez Peña was, without doubt, the most active president of CNIE and thanks to his vision, hard work and the international trust he created, his efforts made it possible for Argentina to participate in many cooperative space experiments with partners like France, Germany, Perú, the United Kingdom and the United States.

    12. Ozone concentrations at a selected high-elevation forest site downwind Mexico City

      NASA Astrophysics Data System (ADS)

      Torres-JArdon, R.

      2013-05-01

      Torres-Jardón, R.*, Rosas-Pérez, I., Granada-Macías, L. M., Ruiz-Suárez, L. G. Centro de Ciencias de la Atmósfera, UNAM, México D. F. México * rtorres@unam.mx For many years, the vegetation of forest species such as Abies religiosa in natural parks located in the southwest mountains of Mexico City has attracted much attention since these parks have been experiencing a severe decline of unclear etiology. The high ozone levels in the area and the observed naked eye macroscopic, histological and cytological injuries on these species, strongly suggest an important contribution of tropospheric ozone to this deterioration process. Apart of historical short monitoring campaigns for measuring ozone levels in these mountains, it is known just a little is known about the present exposure levels at which the local vegetation is exposed. A continuous ozone analyzer has been in operation since 2011 at a high-elevation forest site (Parque Nacional Miguel Hidalgo, PNMH; 3110 m above mean sea level) located downwind of Mexico City Metropolitan Area (MCMA), in order to characterize the local ozone diel amplitude and its seasonal trend, as well as the influence of MCMA on the local O3 concentrations. Hourly average ozone data in PNMH shows that in general, the diel of ozone concentrations in the forest site has a statistical significant correlation with the pattern of ozone levels observed in several monitoring sites (smog receptor sites) within the MCMA, although the high elevation O3 levels are relatively lower than those in the urban area (around 2200 m above mean sea level). It is possible that a part of the oxidants in the air masses are removed by sink deposition processes during the air mass transport across the hills. The diel amplitude of ozone concentrations is small in the cold season, increasing as the seasons advance to June. As in the city, the highest ozone concentrations occur in April or May and the lowest levels during the rainy season, which extends from

    13. National Academy of Sciences Recommends Continued Support of ALMA Project

      NASA Astrophysics Data System (ADS)

      2000-05-01

      , will be built at a high-altitude, extremely dry mountain site in Chile's Atacama desert. The array is scheduled to be completed sometime in this decade. Millimeter-wave astronomy studies the universe in the spectral region where most of its energy lies, between the long-wavelength radio waves and the shorter-wavelength infrared waves. In this realm, ALMA will study the structure of the early universe and the evolution of galaxies; gather crucial data on the formation of stars, protoplanetary disks, and planets; and provide new insights on the familiar objects of our own solar system. "Most of the photons in the Universe lie in the millimeter wavelength regime; among existing or planned instruments only ALMA can image the sources of these photons with the crispness required to understand the events of galaxy, star and planet formation which launched them into space," said NRAO's Dr. Alwyn Wootten, U.S. ALMA Project Scientist. ALMA is an international partnership between the United States (National Science Foundation) and Europe. European participants include the European Southern Observatory, the Centre National de la Recherche Scientifique (France), the Max-Planck Gesellschaft (Germany), the Netherlands Foundation for Research in Astronomy, the United Kingdom Particle Physics and Astronomy Research Council, the Oficina de Ciencia Y Tecnologia/Instituto Geografico Nacional (Spain), and the Swedish Natural Science Research Council. The National Radio Astronomy Observatory is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc.

    14. PREFACE: XIV Mexican Workshop on Particles and Fields

      NASA Astrophysics Data System (ADS)

      Delepine, D.; Napsuciale, M.; Ibarguen, H. S.

      2015-11-01

      María del Tule. Mitla is a pre-Hispanic site, located 25 miles to the south of the city of Oaxaca, founded around 100 years a.c. by the native Zapotecos. Mitla had its golden age between 950-1500 a.c., after the dawn of the city of Monte Albán. It was the main city and center of the Zapotecos society in the Oaxaca central valley. Santa Mará del Tule is a nice town located 7 miles to the south of Oaxaca, famous for the so called ''Árbol del Tule''. This is an ancient tree belonging to the family commonly known as Ahuehuete or Sabino and whose scientific name is Taxodium mucronatum. It is more than 2000 years old and has a trunk with a circumference bigger than 45 meters. The workshop and these Proceedings would have not been possible without the efforts of many institutions: Consejo Nacional de Ciencia y Tecnología (CONACyT) through the Red Nacional de Física de Altas Energías and individual research projects, Universidad de Guanajuato, Universidad Nacional Autónoma de México, Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV), Universidad Michoacana de San Nicolás de Hidalgo and Benemérita Universidad Autónoma de Puebla. We thank all these institutions for their support. Especially, we we wish to thank Universidad de Guanajuato for the financial support via PIFI for the publication of these proceedings. We thank all the speakers for making this a timely and informative workshop. Thanks are due to all who encourage the discussions and stimulate the flow of information during the question and the discussion sessions.

    15. Science As A Second Language: Acquiring Fluency through Science Enterprises

      NASA Astrophysics Data System (ADS)

      Shope, R.; EcoVoices Expedition Team

      2013-05-01

      Science Enterprises are problems that students genuinely want to solve, questions that students genuinely want to answer, that naturally entail reading, writing, investigation, and discussion. Engaging students in personally-relevant science enterprises provides both a diagnostic opportunity and a context for providing students the comprehensible input they need. We can differentiate instruction by creating science enterprise zones that are set up for the incremental increase in challenge for the students. Comprehensible input makes reachable, those just-out-of-reach concepts in the mix of the familiar and the new. EcoVoices takes students on field research expeditions within an urban natural area, the San Gabriel River Discovery Center. This project engages students in science enterprises focused on understanding ecosystems, ecosystem services, and the dynamics of climate change. A sister program, EcoVoces, has been launched in Mexico, in collaboration with the Universidad Loyola del Pacífico. 1) The ED3U Science Inquiry Model, a learning cycle model that accounts for conceptual change: Explore { Diagnose, Design, Discuss } Use. 2) The ¿NQUIRY Wheel, a compass of scientific inquiry strategies; 3) Inquiry Science Expeditions, a way of laying out a science learning environment, emulating a field and lab research collaboratory; 4) The Science Educative Experience Scale, a diagnostic measure of the quality of the science learning experience; and 5) Mimedia de la Ciencia, participatory enactment of science concepts using techniques of mime and improvisational theater. BACKGROUND: Science has become a vehicle for teaching reading, writing, and other communication skills, across the curriculum. This new emphasis creates renewed motivation for Scientists and Science Educators to work collaboratively to explore the common ground between acquiring science understanding and language acquisition theory. Language Acquisition is an informal process that occurs in the midst of

    16. Fish assemblages of the Casiquiare River, a corridor and zoogeographical filter for dispersal between the Orinoco and Amazon basins

      USGS Publications Warehouse

      Winemiller, K.O.; Lopez-Fernandez, H.; Taphorn, D.C.; Nico, L.G.; Duque, A.B.

      2008-01-01

      Aim: The aim of this study was to determine whether the Casiquiare River functions as a free dispersal corridor or as a partial barrier (i.e. filter) for the interchange of fish species of the Orinoco and Negro/Amazon basins using species assemblage patterns according to geographical location and environmental features. Location: The Casiquiare, Upper Orinoco and Upper Negro rivers in southern Venezuela, South America. Methods: Our study was based on an analysis of species presence/absence data and environmental information (11 habitat characteristics) collected by the authors and colleagues between the years 1984 and 1999. The data set consisted of 269 sampled sites and 452 fish species (> 50,000 specimens). A wide range of habitat types was included in the samples, and the collection sites were located at various points along the entire length of the Casiquiare main channel, at multiple sites on its tributary streams, as well as at various nearby sites outside the Casiquiare drainage, within the Upper Orinoco and Upper Rio Negro river systems. Most specimens and field data used in this analysis are archived in the Museo de Ciencias Naturales in Guanare, Venezuela. We performed canonical correspondence analysis (CCA) based on species presence/absence using two versions of the data set: one that eliminated sites having < 5 species and species occurring at < 5 sites; and another that eliminated sites having < 10 species and species occurring at < 10 sites. Cluster analysis was performed on sites based on species assemblage similarity, and a separate analysis was performed on species based on CCA loadings. Results: The CCA results for the two versions of the data set were qualitatively the same. The dominant environmental axis contrasted assemblages and sites associated with blackwater vs. clearwater conditions. Longitudinal position on the Casiquiare River was correlated (r2 = 0.33) with CCA axis-1 scores, reflecting clearwater conditions nearer to its origin

    17. Late magmatic stage of the zoned Caleu pluton (Central Chile): insights from zircon crystallization conditions

      NASA Astrophysics Data System (ADS)

      Molina, P. G.; Parada, M.; Gutierrez, F. J.; Chang-Qiang, M.; Jianwei, L.; Yuanyuan, L.

      2012-12-01

      (IV)/Ce(III) decrease with temperature gives rise to separate trends for each zone, suggesting an independent unbuffered development at time of zircon formation. Taking into account variations in zircon ages, morphologies and crystallization ranges in the collected samples, it is suggested that zircon crystallization took place independent of the magma composition. Furthermore, old inherited zircon grains in the GDZ could be antecrysts, or products of a restricted and not major host rock assimilation, owing to the impossibility of basaltic magmas to saturate zircon crystals, and the isotopically depleted signature. This study is financed by CONICYT-FONDAP grant 15090013, Centro de Excelencia en Geotermia de los Andes (CEGA); and the CONICYT PBCT-PDA07, Programa Bicentenario de Ciencia y Tecnología.

    18. Changes in soil respiration after thinning activities in dense Aleppo pine forests

      NASA Astrophysics Data System (ADS)

      Llovet, Joan; Alonso, Macià; Cerdà, Artemi

      2015-04-01

      variables (i.e. soil characteristics, potential soil heterotrophic respiration, plant biomass surrounding each plot, soil temperature, and soil moisture). Main results showed a seasonal variation of soil respiration as related by other authors (i.e. Almagro et al., 2009), being soil respiration restricted by drying during summer, and by low temperatures during winter. On the other hand, thinning significantly diminished soil respiration, its decrease was around 33% (from 5.3 micromole CO2 m-2 second-1, to 3.6 micromole CO2 m-2 second-1). Our results suggest that autotrophic respiration could be highly responsible of this decrease: we found significant and positive relationships between soil respiration and vegetation surrounding plots, and we did not find differences in potential soil heterotrophic respiration between treatments. Acknowledgements We thanks the financial support of the RESILIEN project funded by the Spanish Government, Ministerio de Ciencia e Innovación CGL2011-30515-C02-02. The RECARE project is funded by the European Commission FP7 program, ENV.2013.6.2-4 "Sustainable land care in Europe". References Almagro, M., López, J., Querejeta, J. I., Martínez Mena, M. 2009. Temperature dependence of soil CO2 efflux is strongly modulated by seasonal patterns of moisture availability in a Meditarranean ecosystem. Soil Biology and Biochemistry, 41. 594-605 Moreno, J.M., Vázquez, A., Vélez, R. 1998. Recent history of forest fires in Spain. In: Moreno, J. M. (ed). Large Fires. Backhuys Publishers, Leiden, The Netherlands, pp. 159-185. Pausas, J. G., Ribeiro, E., Vallejo, V. R. 2004. Post-fire regeneration variability of Pinus halepensis in the eastern Iberian Peninsula. Forest Ecology and Management, 203. 251-259. Ruiz Navarro, A., Barberá, G. G., Navarro Cano, J. A., Albaladejo, J., Castillo, V. M. 2009. Soil dynamics in Pinus halepensis reforestation: Effect of microenvironment and previous land use. Geoderma, 153. 353-361.

    19. Calibration of three rainfall simulators with automatic measurement methods

      NASA Astrophysics Data System (ADS)

      Roldan, Margarita

      2010-05-01

      CALIBRATION OF THREE RAINFALL SIMULATORS WITH AUTOMATIC MEASUREMENT METHODS M. Roldán (1), I. Martín (2), F. Martín (2), S. de Alba(3), M. Alcázar(3), F.I. Cermeño(3) 1 Grupo de Investigación Ecología y Gestión Forestal Sostenible. ECOGESFOR-Universidad Politécnica de Madrid. E.U.I.T. Forestal. Avda. Ramiro de Maeztu s/n. Ciudad Universitaria. 28040 Madrid. margarita.roldan@upm.es 2 E.U.I.T. Forestal. Avda. Ramiro de Maeztu s/n. Ciudad Universitaria. 28040 Madrid. 3 Facultad de Ciencias Geológicas. Universidad Complutense de Madrid. Ciudad Universitaria s/n. 28040 Madrid The rainfall erosivity is the potential ability of rain to cause erosion. It is function of the physical characteristics of rainfall (Hudson, 1971). Most expressions describing erosivity are related to kinetic energy or momentum and so with drop mass or size and fall velocity. Therefore, research on factors determining erosivity leds to the necessity to study the relation between fall height and fall velocity for different drop sizes, generated in a rainfall simulator (Epema G.F.and Riezebos H.Th, 1983) Rainfall simulators are one of the most used tools for erosion studies and are used to determine fall velocity and drop size. Rainfall simulators allow repeated and multiple measurements The main reason for use of rainfall simulation as a research tool is to reproduce in a controlled way the behaviour expected in the natural environment. But in many occasions when simulated rain is used in order to compare it with natural rain, there is a lack of correspondence between natural and simulated rain and this can introduce some doubt about validity of data because the characteristics of natural rain are not adequately represented in rainfall simulation research (Dunkerley D., 2008). Many times the rainfall simulations have high rain rates and they do not resemble natural rain events and these measures are not comparables. And besides the intensity is related to the kinetic energy which

    20. The Gemini Planet-finding Campaign: The Frequency Of Giant Planets around Debris Disk Stars

      NASA Astrophysics Data System (ADS)

      Wahhaj, Zahed; Liu, Michael C.; Nielsen, Eric L.; Biller, Beth A.; Hayward, Thomas L.; Close, Laird M.; Males, Jared R.; Skemer, Andrew; Ftaclas, Christ; Chun, Mark; Thatte, Niranjan; Tecza, Matthias; Shkolnik, Evgenya L.; Kuchner, Marc; Reid, I. Neill; de Gouveia Dal Pino, Elisabete M.; Alencar, Silvia H. P.; Gregorio-Hetem, Jane; Boss, Alan; Lin, Douglas N. C.; Toomey, Douglas W.

      2013-08-01

      formation; our non-detections at large separations show that planets with orbital separation >40 AU and planet masses >3 M Jup do not carve the central holes in these disks. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    1. The Gemini/NICI Planet-Finding Campaign: The Frequency of Planets around Young Moving Group Stars

      NASA Astrophysics Data System (ADS)

      Biller, Beth A.; Liu, Michael C.; Wahhaj, Zahed; Nielsen, Eric L.; Hayward, Thomas L.; Males, Jared R.; Skemer, Andrew; Close, Laird M.; Chun, Mark; Ftaclas, Christ; Clarke, Fraser; Thatte, Niranjan; Shkolnik, Evgenya L.; Reid, I. Neill; Hartung, Markus; Boss, Alan; Lin, Douglas; Alencar, Silvia H. P.; de Gouveia Dal Pino, Elisabete; Gregorio-Hetem, Jane; Toomey, Douglas

      2013-11-01

      ., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    2. Structure and Dynamics of the Accretion Process and Wind in TW Hya

      NASA Astrophysics Data System (ADS)

      Dupree, A. K.; Brickhouse, N. S.; Cranmer, S. R.; Berlind, P.; Strader, Jay; Smith, Graeme H.

      2014-07-01

      of the W. M. Keck Foundation. Infrared spectra were taken at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), formerly the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). This paper also includes spectra gathered with the 6.5 m Magellan Telescope/CLAY located at Las Campanas Observatory, Chile. Additional spectra were obtained at the 1.5 m Tillinghast Telescope at the Fred Lawrence Whipple Observatory of the Smithsonian Astrophysical Observatory.

    3. Strong lensing analysis of PLCK G004.5-19.5, a Planck-discovered cluster hosting a radio relic at z = 0.52

      NASA Astrophysics Data System (ADS)

      Sifón, Cristóbal; Menanteau, Felipe; Hughes, John P.; Carrasco, Mauricio; Barrientos, L. Felipe

      2014-02-01

      by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation (NSF) on behalf of the Gemini partnership: the NSF (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), Comisión Nacional de Investigación Científica y Tecnológica (CONICYT, Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    4. The Unusual Temporal and Spectral Evolution of SN2011ht. II. Peculiar Type IIn or Impostor?

      NASA Astrophysics Data System (ADS)

      Humphreys, Roberta M.; Davidson, Kris; Jones, Terry J.; Pogge, R. W.; Grammer, Skyler H.; Prieto, José L.; Pritchard, T. A.

      2012-11-01

      MMT Observatory, a joint facility of the Smithsonian Institution and the University of Arizona, on data from the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555, and on observations from the Gemini Observatory, operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    5. A Sample of Seyfert-2 Galaxies with Ultraluminous Galaxy-wide Narrow-line Regions: Quasar Light Echoes?

      NASA Astrophysics Data System (ADS)

      Schirmer, M.; Diaz, R.; Holhjem, K.; Levenson, N. A.; Winge, C.

      2013-01-01

      obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    6. Discrimination of different sub-basins on Tajo River based on water influence factor

      NASA Astrophysics Data System (ADS)

      Bermudez, R.; Marcano Cerdeño, A.; Tarquis, A. M.; Andina, D.

      2012-04-01

      into account the ions and the sum of them as variables, we obtain the best classification. The stations are grouped according to the electrical conductivity (EC), total anions (ta), total cations (ct) and the ratio of the ions (Na / Ca y Mg / Ca). For a given classification and comparison of different groups created some variation in ion concentration and the ratio of the ions are observed. However, the variation in each ion is different between groups as appropriate. For the latter group, regardless of classification, the increase of all ions is general. Comparing the dendrograms, and the groups that originated the Tajo river basin can be sub dived into five distinct sub-basins by the main influence on the water: 1.With a greater influence ombrogenic (rainfed). 2.The ombrogenic and soil influence (rain and groundwater fed). 3.With pedogenic influence. 4.With lithogenic influence (geological foundation). 5.With greater and lithogenic ombrogenic additional influence. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. AGL2010-21501/AGR is greatly appreciated.

    7. A census of Hα emitters in the intergalactic medium of the NGC 2865 system

      NASA Astrophysics Data System (ADS)

      Urrutia-Viscarra, F.; Arnaboldi, M.; Mendes de Oliveira, C.; Gerhard, O.; Torres-Flores, S.; Carrasco, E. R.; de Mello, D.

      2014-09-01

      -enriched gas removed from the host galaxies in a merger event. The relevance of these observations is discussed. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina) - Observing runs: GS-2008A-Q-35.

    8. Galaxy Clusters in the Line of Sight to Background Quasars. III. Multi-object Spectroscopy

      NASA Astrophysics Data System (ADS)

      Andrews, H.; Barrientos, L. F.; López, S.; Lira, P.; Padilla, N.; Gilbank, D. G.; Lacerna, I.; Maureira, M. J.; Ellingson, E.; Gladders, M. D.; Yee, H. K. C.

      2013-09-01

      -frame colors (Rc - z') typical of S cd galaxies. From this sample, absorbing cluster galaxies hosting weak absorbers are consistent with lower star formation activity than the rest, which produce strong absorption and agree with typical Mg II absorbing galaxies found in the literature. Our spectroscopic confirmations lend support to the selection of photometric hits made in López et al. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência e Tecnologia (Brazil), and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

    9. Preliminary results on the effects of afforestation of maize soils with Populus alba L., on carbon metabolism

      NASA Astrophysics Data System (ADS)

      García-Campos, Elena; Zorita, Félix; Gil-Sotres, Fernando; Leirós, Mā Carmen; Trasar-Cepeda, Carmen

      2010-05-01

      and before any other agricultural activities were carried out. Samples were collected from the upper 10 cm of soil and were analysed for total carbon and nitrogen, basal respiration, microbial biomass C and labile C content (extractable with potassium sulphate); the metabolic coefficient (qCO2), or in other words the quantity of C-CO2evolved per unit of microbial biomass C, was also calculated. The main general properties of the soils were determined, along with the apparent density, to enable the results to be expressed per unit of weight and per unit of volume. The results show that afforestation generally had little effect on the soil properties. Thus, comparison of the mean values obtained for afforested soils with the mean values obtained for agricultural soils revealed that, independently of whether the results were expressed per unit of weight or per unit of volume, the total C and N contents were slightly higher in the afforested soils; the same was also found for basal respiration and qCO2, whereas the microbial biomass C and labile C contents were very similar in both types of soils. The variations were not significant in any case. Furthermore, exactly the same patterns were observed when the respiration, microbial biomass C and labile C values were expressed relative to the total C or N contents of the soils. The scant modification of carbon metabolism may be attributed to the short time since afforestation, as well as to work carried out when the trees were planted. Acknowledgements. This research was financially supported by the Spanish Ministerio de Ciencia e Innovación (CGL2008-01992/BTE).

    10. Modification of the activity of some C cycle hydrolases in soils afforested with Populus alba L. Preliminary results

      NASA Astrophysics Data System (ADS)

      Zorita, Félix; García-Campos, Elena; Gil-Sotres, Fernando; Leirós, Mā Carmen; Trasar-Cepeda, Carmen

      2010-05-01

      analysis for ß-glucosidase, invertase and CM-cellulase activity. The main physical and chemical properties of the soils were also determined (total C and N contents, pH in water and in KCl, texture, etc) and the apparent density measured to enable the results to be expressed per unit of weight as well as per unit of volume. The mean values of total C and N in the afforested soils were slightly higher than in the cropped soils, independently of whether the results were expressed relative to weight or volume. The differences were not significant in any of the cases. Afforestation appeared to cause small increases in ß-glucosidase and invertase activities, but a decrease in CM-cellulase activity. Again the same results were obtained independently of whether the values were expressed per unit of weight or volume. The same was also found when the values were expressed relative to the N content of the soils, but when the values were expressed relative to the total C content, the ß-glucosidase activity was found to be the same in afforested and cropped soils. The greater availability of plant remains as the result of the change in land use may have favoured increased activity of enzymes that act on the most readily decomposable substrates (ß-glucosidase and invertase), which in turn would generate an increase in the substrates available for microorganisms, and possibly contribute to the higher respiratory activity observed in these soils (García-Campos et al., 2010, EGU General Assembly, Session 13). Acknowledgements. This research was financially supported by the Spanish Ministerio de Ciencia e Innovación (CGL2008-01992/BTE).

    11. Determining the Shape of the Orbit of Mars in the High School. (Spanish Title: Determinación de la Forma de la Órbita de Marte en la Escuela Secundaria.) Determinando a Forma da Órbita de Marte no Ensino Médio

      NASA Astrophysics Data System (ADS)

      Dutra, Carlos Maximiliano; Rossini Goulart, Andressa

      2014-12-01

      In the present work, in order to supply the lacks of practical activities related to the content of Kepler's Laws in high school physics textbooks, we present a practical activity to determine the shape of the orbit of Mars. In this activity the student can experience the discovery the shape of the orbit of Mars in a way similar to that realized by Johannes Kepler combining the physical concepts with geometry. We applied the activity to eighteen high school teachers participating in a Postgraduate Course in Science Education. After two hours of work the group obtained the shape of the orbit of Mars and estimated its orbital parameters with a relative error less than 14%. En el presente trabajo y con el objetivo de reducir la escasez de actividades prácticas relacionadas con el contenido de las leyes de Kepler en libros de texto de física de la escuela secundaria, se presenta una actividad práctica para determinar la forma de la órbita de Marte. En esta actividad el estudiante puede vivir la experiencia de descubrir la forma de la órbita de Marte de una manera similar a la realizada por Johannes Kepler combinando los conceptos físicos con la geometría. Aplicamos la actividad a dieciocho maestros de escuelas secundarias en un Curso de Especialización en Enseñanza de las Ciencias. Después de dos horas de trabajo el grupo obtuvo la forma de la órbita de Marte com error inferior al 14% en los parámetros orbitales. No presente trabalho, visando suprir a deficiência de atividades práticas relacionadas ao conteúdo de Leis de Kepler nos livros-textos de Física do 1º ano do Ensino Médio, apresentamos uma atividade prática de determinação da órbita de Marte. O aluno, combinando conceitos físicos com a geometria poderá vivenciar a experiência da descoberta da forma da órbita de Marte de modo similar ao realizado por Johannes Kepler. Aplicamos a metodologia proposta junto a dezoito professores do Curso de Especialização em Educação em Ciências e

    12. Obituary -- Salvador González Bedolla

      NASA Astrophysics Data System (ADS)

      Peña, H. José

      1997-04-01

      the Instituto de Astronomóa de Andalucóa, Spain. His participation was active and indispensable in international campaigns which were carried out to study short period pulsators with very complex sets of frequencies using an analysis of light curves. Thanks to his observations, which were quite reliable, the pulsational and astrophysical characteristics of a great number of them have been resolved. Also, during these investigations, many new pulsators were discovered, especially Delta Scuti stars. Salvador also dedicated many years to teaching. Beginning in 1972, he taught physics and chemistry at the Colegio de Ciencias y Humanidades of the UNAM where he also developed programs, evaluated candidates for teaching posts and published books about his specialities. His loss, a product of the senseless violence of modern life in México City, is mourned by the Instituto de Astronomóa, UNAM, since he always tried to develop his activities with a high degree of professionalism and with great enthusiasm. Salvador, your colleagues and friends miss you and your memory will always remain with us.

    13. Seventy-One Important Questions for the Conservation of Marine Biodiversity

      PubMed Central

      PARSONS, E C M; FAVARO, BRETT; AGUIRRE, A ALONSO; BAUER, AMY L; BLIGHT, LOUISE K; CIGLIANO, JOHN A; COLEMAN, MELINDA A; CÔTÉ, ISABELLE M; DRAHEIM, MEGAN; FLETCHER, STEPHEN; FOLEY, MELISSA M; JEFFERSON, REBECCA; JONES, MIRANDA C; KELAHER, BRENDAN P; LUNDQUIST, CAROLYN J; MCCARTHY, JULIE-BETH; NELSON, ANNE; PATTERSON, KATHERYN; WALSH, LESLIE; WRIGHT, ANDREW J; SUTHERLAND, WILLIAM J

      2014-01-01

      participantes se incluyeron a individuos de la docencia, el gobierno y organizaciones no-gubernamentales, con una amplia experiencia que atraviesa disciplinas, ecosistemas marinos y países que varían en el nivel de desarrollo. Los contribuyentes de los campos de la ciencia, la conservación, la industria y el gobierno, presentaron preguntas a nuestros talleres, las cuales separamos en una lista de preguntas de investigación prioritarias. Por medio de este proceso, identificamos 71 preguntas clave. Las agrupamos en ocho categorías temáticas, cada una perteneciente a un componente amplio de la conservación marina: pesquerías, cambio climático, otras amenazas antropogénicas, ecosistemas, ciudadanía marina, política, consideraciones sociales y culturales, y la iniciativa científica. Nuestras preguntas se dirigen a muchas cuestiones que son específicas de la conservación marina, y servirán como una ruta a seguir para patrocinadores e investigadores que busquen desarrollar programas que puedan beneficiar ampliamente a la conservación marina. PMID:24779474

    14. N-P-K balance in a milk production system on a C. nlemfuensis grassland and a biomass bank of P. purpureum CT-115 clone

      NASA Astrophysics Data System (ADS)

      Crespo, G.; Rodriguez, I.; Martinez, O.

      2009-04-01

      results agree with those reported by Jarvis (1993) and Cadish et al (1994). However, 40% of the excretions occurred in the shade buildings and milking parlours ant thus these nutrients did not recycle in the system. An important internal recycling mechanism, especially for nitrogen and potassium, is their remobilization by the rejected pasture to re-use them for the regrowth activity. This is of particular interest in CT-115 Bank, since stems of CT-115 plants left after grazing remobilize an important amount of these nutrients, guarantee a favourable pasture regrowth (Martinez 1996). The return of all the excretion to the grassland is recommended as well as increasing the area of legumes to attain a satisfactory balance of N, P and K in the system. Further studies must consider maintenance fertilization, nutrient losses due to leaching and denitrification, as well as variation of the stable OM in the soil and the influence of hydro physical properties in the recycling process. The "Recycling" software was effective to determine the balance of nutrients in the dairy farm. Cadish, G., Schunke, R.N & Giller, K.E. 1994. Nitrogen cycling in a pure grass pasture and a grass-legume mixture on a red latosol in Brazil. Tropical Grasslands 28:43. Crespo G. y Rodríguez, I. 2006. Contribución al conocimiento del reciclaje de los nutrientes en el sistema suelo-pasto-animal. Instituto de Ciencia Animal, Editorial EDICA, La Habana, Cuba, 94 pp. Hirata, M., Sugimoto, Y.G & Ueno, M.1991. Use of a mathematical model to evaluate the effects of dung from grazing animals on pasture production. J. Japan Grassld. Sci. 37:303.

    15. PREFACE: Loops 11: Non-Perturbative / Background Independent Quantum Gravity

      NASA Astrophysics Data System (ADS)

      Mena Marugán, Guillermo A.; Barbero G, J. Fernando; Garay, Luis J.; Villaseñor, Eduardo J. S.; Olmedo, Javier

      2012-05-01

      only was it a showroom for the research currently being carried out by many groups throughout the world, but there was also a permanent look towards the future. During these days, the CSIC Campus witnessed many scientific conversations triggered by the interaction amongst the people and groups that participated in LOOPS'11 Madrid and which, in many cases, will crystallise into new results and advances in the field. The conference would not have been possible without the generous help of a number of national and international institutions. The organizers would like to acknowledge the financial support provided by the Spanish Ministry of Science and Innovation (Ministerio de Ciencia e Innovación), the Spanish Research Council, CSIC (Consejo Superior de Investigaciones Cientĺficas), The BBVA Foundation (Fundación BBVA), The CONSOLIDER-CPAN project, the Spanish Society for Gravitation and Relativity (SEGRE), The Universidad Carlos III of Madrid (UC3M), and the European Science Foundation (ESF). The ESF, through the Quantum Gravity and Quantum Geometry network, provided full support for a number of young participants that have contributed to these proceedings: Dario Benedetti (Albert Einstein Institute, Potsdam, Germany), Norbert Bodendorfer (Institute for Theoretical Physics III, FAU Erlangen Nürnberg, Germany), Mariam Bouhmadi López (CENTRA, Centro Multidisciplinar de Astrofĺsica, Lisbon), Timothy Budd (Institute for Theoretical Physics, Utrecht University, The Netherlands), Miguel Campiglia (Institute for Gravitation and the Cosmos, Penn State University, USA), Gianluca Delfino (School of Mathematical Sciences, University of Nottingham, UK), Maite Dupuis (Institute for Theoretical Physics III, FAU Erlangen Nürnberg, Germany), Michał Dziendzikowski (Institute of Theoretical Physics, Warsaw University, Poland), Muxin Han (Centre de Physique Théorique de Luminy, Marseille, France), Philipp Höhn (Institute for Theoretical Physics, Utrecht University, The

    16. Forms of Appropriation of Tools for the Astronomy Education in Continuous Training of Teachers. (Spanish Title: Formas de Apropriación de Herramientas Para la Enseñanza de la Astronomía en la Formación Docente Continua.) Formas de Apropriação de Instrumentos Para o Ensino de Astronomia na Formação Continuada de Professores

      NASA Astrophysics Data System (ADS)

      Marques Soares, Leonardo; Sousa Nascimento, Silvania

      2012-07-01

      The main focus of this article is to present some impressions about the way some teachers appropriated of the tools from the ASTRONOMY TEACHING KIT (KITPEA). The subjects of this research were teachers that took part in the astronomy teaching specialization course offered by the Continuing Education Project (FOCO) at Math and Science Teaching Center (CECIMIG) from the School of Education of Federal University of Minas Gerais (FaE/UFMG). The data was collected with the use of a questionnaire and of an interview applied to these teachers. The analysis of the data was structured with the aid of the Activity Theory and the Mediated Action Theory. We interpret the teachers' speech using the constitutive aspects of the activity system and the concepts of appropriation and domain as an analytical device. It was possible to recognize the appropriation of the tools in 7 narratives among the 11 individuals who took part in the research. El objetivo principal de ese artículo es presentar indicaciones sobre la manera como algunos maestros se apropiaron de las herramientas del KIT PARA LA ENSEÑANZA DE LA ASTRONOMÍA (KITPEA). Los sujetos de esa investigación son docentes que participaron del curso de especialización en enseñanza de astronomía ofrecido por el Proyecto de Formación Continua (Foco) en el Centro de Enseñanza de Ciencias y Matemática (CECIMIG) de la Facultad de Educación de la Universidad Federal de Minas Gerais (FaE/UFMG). Recogimos las informaciones a través de un cuestionario y de una encuesta, aplicados a esos docentes. Estructuramos el análisis de esas informaciones con la ayuda de la Teoría de la Actividad y de la Teoría de la Acción Mediada. Interpretamos os discursos de los docentes usando como dispositivo analítico los elementos constitutivos del sistema de actividad y los conceptos apropiación y dominio. Entre los 11 sujetos que participaron de la investigación, fue posible interpretar con claridad la apropiación de las herramientas en

    17. PREFACE: 21st Latin American Symposium on Solid State Physics (SLAFES XXI)

      NASA Astrophysics Data System (ADS)

      Aguiar, J. Albino

      2014-04-01

      The Latin American Symposium on Solid State Physics (SLAFES) started in Caracas-Venezuela, and over time the symposia have taken place in 9 different Latin American countries. The last five events took place in Mérida-Venezuela (2002), Havana-Cuba (2004), Puebla-Mexico (2006), Puerto Iguazú-Argentina (2008) and Maragogi-Brazil (2011). During the last years, in the different SLAFES editions, the aim has been to bring together researches from Latina America and invite renowned scientists from around the world to a unique forum to discuss the latest developments regarding Solid state Physics. The 21st Latin American Symposium on Solid State Physics (SLAFES XXI) was held in Villa de Leyva-Colombia, from September 30 to October 04, 2013. The 21st SLAFES version featured the participation of experts in various areas of Solid State Physics from countries such as Belgium, Germany, United States, Spain, Ireland, Chile, Argentina and Brazil, had 270 submitted works and was attended by 140 researchers. The development of this event was made possible by financial support from the Universidad Pedagógica y Tecnológica de Colombia, Universidad Nacional de Colombia, Universidad del Norte-CO, Universidad de Magdalena-CO, Universidade Federal de Pernambuco-BR and the Academia Colombiana de Ciencias Exatas, Naturales y Física. Editors Professor J Albino Aguiar Departamento de Física Universidade Federal de Pernambuco 50670-901 Recife PE Brazil e-mail: albino@df.ufpe.br Professor Jairo Roa-Rojas Grupo de Física de Nuevos Materiales Departamento de Física Universidad Nacional de Colombia A.A. 5997 Bogotá DC, Colombia e-mail: jroar@unal.edu.co Professor Carlos Arturo Parra Vargas Grupo Física de Materiales Escuela de Física Universidad Padagógica y Tecnológica de Colombia Tunja Colombia e-mail: carlos.parra@uptc.edu.co Professor David A Land\\'i nez Téllez Grupo de Física de Nuevos Materiales Departamento de Física Universidad Nacional de Colombia A.A. 5997 Bogotá DC

    18. Application of Three-Dimensional Models for the Teaching of Time Zones. (Breton Title: Aplicação de Modelos Tridimensionais Para o Ensino de Fusos Horários.) Aplicación de Modelos Tridimensionales Para la Enseñanza de Husos Horarios

      NASA Astrophysics Data System (ADS)

      Azevedo Sobreira, Paulo Henrique

      2012-07-01

      deben trabajar en la enseñanza media y básica, en las asignaturas de Geografía y de Ciencias. Entre ellos, el de los husos horarios que es uno de los más importantes para correlacionar la rotación de la Tierra y sus implicaciones en las actividades diarias de los ciudadanos en escala local, regional y global, y en general, cuestiones que implican problemas de las diferencias horarias. Para la enseñanza de los husos horarios en las clases de Geografía, por ejemplo, hay representaciones bidimensionales de los mapas temáticos de husos horarios mundiales, en libros y atlas didácticos. Sin embargo, los profesores se enfrentan con algunas dificultades para hacer posible que sus alumnos tengan una visión tridimensional de este fenómeno astronómico, usando los materiales didácticos disponibles en las escuelas. El objetivo de este trabajo es presentar la construcción de dos propuestas de materiales de bajo costo, que hacen posible la elaboración de modelos tridimensionales para la enseñanza de los husos horarios.

    19. Evaluation of the Charm maximum residue limit β-lactam and tetracycline test for the detection of antibiotics in ewe and goat milk.

      PubMed

      Beltrán, M C; Romero, T; Althaus, R L; Molina, M P

      2013-05-01

      The Charm maximum residue limit β-lactam and tetracycline test (Charm MRL BLTET; Charm Sciences Inc., Lawrence, MA) is an immunoreceptor assay utilizing Rapid One-Step Assay lateral flow technology that detects β-lactam or tetracycline drugs in raw commingled cow milk at or below European Union maximum residue levels (EU-MRL). The Charm MRL BLTET test procedure was recently modified (dilution in buffer and longer incubation) by the manufacturers to be used with raw ewe and goat milk. To assess the Charm MRL BLTET test for the detection of β-lactams and tetracyclines in milk of small ruminants, an evaluation study was performed at Instituto de Ciencia y Tecnologia Animal of Universitat Politècnica de València (Spain). The test specificity and detection capability (CCβ) were studied following Commission Decision 2002/657/EC. Specificity results obtained in this study were optimal for individual milk free of antimicrobials from ewes (99.2% for β-lactams and 100% for tetracyclines) and goats (97.9% for β-lactams and 100% for tetracyclines) along the entire lactation period regardless of whether the results were visually or instrumentally interpreted. Moreover, no positive results were obtained when a relatively high concentration of different substances belonging to antimicrobial families other than β-lactams and tetracyclines were present in ewe and goat milk. For both types of milk, the CCβ calculated was lower or equal to EU-MRL for amoxicillin (4 µg/kg), ampicillin (4 µg/kg), benzylpenicillin (≤ 2 µg/kg), dicloxacillin (30 µg/kg), oxacillin (30 µg/kg), cefacetrile (≤ 63 µg/kg), cefalonium (≤ 10 µg/kg), cefapirin (≤ 30 µg/kg), desacetylcefapirin (≤ 30 µg/kg), cefazolin (≤ 25 µg/kg), cefoperazone (≤ 25 µg/kg), cefquinome (20 µg/kg), ceftiofur (≤ 50 µg/kg), desfuroylceftiofur (≤ 50µg/kg), and cephalexin (≤ 50 µg/kg). However, this test could neither detect cloxacillin nor nafcillin at or below EU-MRL (CCβ >30 µg/kg). The

    20. Helium and carbon isotope systematics of Rungwe geothermal gases and fluids; southern Tanzania

      NASA Astrophysics Data System (ADS)

      Barry, P. H.

      2009-12-01

      P. H. BARRY1*, D. R. HILTON1, T. P. FISCHER2, J. M. DE MOOR2, F. MANGASINI3 C. RAMIREZ4 1 Geosciences Research Division, Scripps Institution of Oceanography, UCSD, La Jolla, California 92093-0244, USA (*Correspondence: pbarry@ucsd.edu) 2 Department of Earth and Planetary Sciences, MSC 03 2040, 1 University of New Mexico, Albuquerque, New Mexico 87131-0001, USA. 3 Department of Mining and Mineral Processing Engineering, University of Dar Es Salaam, PO Box 35131, Dar Es Salaam, Tanzania. 4 Centro de Investigaciones en Ciencias Geologicas, Escuela Centroamericana de Geologia, Universidad de Costa Rica. The East African Rift (EAR) is the largest modern example of continental rifting, extending from the Afar depression in the north to the Rungwe region in southern Tanzania. EAR volcanism is attributed to the presence of one or more mantle plumes [1]. Late Miocene to recent volcanism and geothermal activity mark the Rungwe region [2], with mafic eruptions as recently as 200 years ago. Our aim is to delineate the southern geographical extent of plume influence on the propagating EAR by investigating the He-CO2 characteristics of geothermal fluids in the Rungwe region. We report new helium (He) and carbon (C) isotopes (3He/4He, δ13C) and relative abundance (CO2/3He) characteristics for a suite of 20 geothermal gas and fluid samples from 11 different localities in the Rungwe region. He-isotopes are in good agreement with previous reports [3], and range from ~1 RA to ~7 RA (MORB-like values), indicating admixture between upper mantle He and variable proportions of radiogenic He. C-isotopes ranges from -2.8 to -6.5 ‰ (vs. PDB) with all falling in the MORB range (~4.5 ± 2‰). CO2/3He ratios vary over 5 orders of magnitude from ~3 x 10^9 (MORB-like) to higher values (up to ~3 x 10^13) normally associated with crustal lithologies. Taken together, the He-CO2 data can be explained by 2-component mixing of a deep-seated mantle source with crustal component(s). There are no

    1. Sulfur isotope study of the Velardeña skarn (Zn-Pb), Durango, Mexico

      NASA Astrophysics Data System (ADS)

      Jimenez, A.

      2012-04-01

      Sulfur isotope study of the Velardeña skarn (Zn-Pb), Durango, Mexico Abigail Jimenez-Franco1*, Pura Alfonso Abella2, Carles Canet3, Eduardo González-Partida4 1 Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Ciudad Universitaria, Delegación Coyoacán, 04510 México D.F., Mexico 2 Departament d'Enginyeria Minera i Recursos Naturals, Universitat Politècnica de Catalunya, Av de Les Bases de Manresa 61-73, 08242 Manresa. 3Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Delegación Coyoacán, 04510 México D.F., Mexico 4Centro de Geociencias, Universidad Nacional Autónoma de México, Campus Juriquilla, Boulevard Juriquilla 3001, 76230 Santiago de Querétaro, Qro., Mexico The Velardeña mining district is located in north-eastern part of the state of Durango, in northern of Mexico. The ore deposit is a lead-zinc, garnet-rich skarn developed at the contact between granite porphyry dikes (Eocene) and well-laminated limestones with interbedded chert (Albian-Cenomanian). A study of sulfur isotopes has been carried out in various sulfide minerals of the ores of Velardeña, in order to: (a) constrain the possible sources of sulfur and, therefore, better understand the sulfide mineralizing processes, and (b) to estimate the temperature of the ore-forming stage of the skarn. Sulfur isotope analyses were performed in 21 pure fractions of sulfide minerals of the ore mineralization (pyrite, chalcopyrite, sphalerite and galena). The mineral separation was performed using a series of sieves, and the purity of the samples was verified under a binocular microscope. Isotopic analyses were done on a Finnigan MAT Delta C flow elemental analyzer coupled to a TC-EA, according with the method of Giesemann et al. (1974). The δ34S values of the analyzed sulfides range mostly between -0.6 and +2.6 ‰ (relative to the CDT standard). These values are indicative of a magmatic source of sulfur. A single analysis falls

    2. PREFACE: Physics-Based Mathematical Models for Nanotechnology

      NASA Astrophysics Data System (ADS)

      Voon, Lok C. Lew Yan; Melnik, Roderick; Willatzen, Morten

      2008-03-01

      In November 2007, some of the world's best nanoscientists and nanoengineers met at the Banff Centre, where the Banff International Research Station hosted a workshop on recent developments in the mathematical study of the physics of nanomaterials and nanostructures. The Banff International Research Station for Mathematical Innovation and Discovery (BIRS) is a collaborative Canada-US-Mexico venture that provides an environment for creative interaction as well as the exchange of ideas, knowledge, and methods within the Mathematical Sciences, with related disciplines and with industry. The research station is located in a scenic part of Alberta, Canada and is supported by Canada's Natural Science and Engineering Research Council (NSERC), the US National Science Foundation (NSF), Alberta's Advanced Education and Technology, and Mexico's Consejo Nacional de Ciencia y Tecnología (CONACYT). We would like to thank the BIRS and its sponsors for the given opportunity and the BIRS staff for their excellent support during the workshop. Nanotechnology is the study and application of phenomena at or below the dimensions of 100 nm and has received a lot of public attention following popular accounts such as in the bestselling book by Michael Crichton, Prey. It is an area where fundamental questions of applied mathematics and mathematical physics, design of computational methodologies, physical insight, engineering and experimental techniques are meeting together in a quest for an adequate description of nanomaterials and nanostructures for applications in optoelectronics, medicine, energy-saving, bio- and other key technologies which will profoundly influence our life in the 21st century and beyond. There are already hundreds of applications in daily life such as in cosmetics and the hard drives in MP3 players (the 2007 Nobel prize in physics was recently awarded for the science that allowed the miniaturization of the drives), delivering drugs, high-definition DVD players and

    3. Editorial: Trends in Nanotechnology (TNT2005)

      NASA Astrophysics Data System (ADS)

      Correia, Antonio; Serena, Pedro A.; José Saenz, Juan; Reifenberger, Ron; Ordejón, Pablo

      2006-05-01

      the successful consequence of a coordinated effort among several organising Institutions: PHANTOMS Foundation, Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas, Universidad Carlos III de Madrid, Universidad Complutense de Madrid, Universidad de Oviedo, Donostia International Physics Center, Nanomaterials Laboratory-NIMS, CEA/LETI and CEA/DSM/DFRMC, University of Purdue and Georgia Institute of Technology. In addition, we are indebted to the following institutions, companies and government agencies for their help and financial support: NASA, Air Force Office of Scientific Research, iNANO, NSERC/CRSNG (Nano Innovation Platform), Sociedad de Microscopía Española (SME), Wiley-VCH, Raith GmbH, The European Office of Aerospace Research and Development (EOARD), The Office of Naval Research International Field Office (ONRIFO), World Scientific and Imperial College Press, Ministerio de Educación y Ciencia, Parque Científico de Barcelona, Parque Científico de Madrid, Tyndall National institute, Nanoquanta, GDR-E Nano-E, Minatec, Dupont, Physica Status Solidi, Zeiss, Ayuntamiento de Oviedo, Gobierno de Principado de Asturias, Asturiana de Zinc, cajAstur, Aleastur, Aceralia-Grupo Arcelor, Saint-Gobain Cristaleria, Mediadores Asociados Asturianos and Inderscience Publishers.We would like also to thanks the following companies for their participation: NanoTec, Raith GmbH, Scientec, NT-MDT, Schaefer Techniques, Suss Microtec, Carl Zeiss, Biometa, Wiley-VCH, World Scientific and Imperial College Press and Atomic Force.We invite readers of this special issue to join us in Grenoble (France), where the next Trends in Nanotechnology 2006 edition will take place (http://www.tnt2006.org).

    A. Ashtekhar (Pennsylvania State University, USA)
    L. J. Boya (Universidad de Zaragoza, Spain)
    I. Cirac (Max Planck Institute, Garching

  40. PREFACE: Preface

    NASA Astrophysics Data System (ADS)

    De Zela, Francisco

    2011-01-01

    Puebla, Mexico. The OSA award went to Facundo Orte, from ANPCyT and Ceilap (Citefa-Conicet), Argentina. For the first time, RIAO-OPTILAS was preceded by the Andean School for Optics: OPTOANDINA. The School was organized with the aim of boosting the development of optics and photonics in the Andean countries, which are among the less developed ones in the Iberoamerican region. A welcome sign for the effectiveness of such an initiative was given by the increased participation of Bolivia in the present edition of RIAO-OPTILAS. Over one hundred participants attended OPTOANDINA, of which 65 were students and 30 were lecturers, while 6 facilitators were ready to help during the hands-on sessions. RIAO-OPTILAS has traditionally been organized by the host institution. Though this will remain the case for future gatherings of the conference, its increased importance and growing magnitude - in both number of participants and represented areas - has made it necessary to provide the conference with a permanent organizational umbrella. With such an aim, a network called RIAO (Red Iberoamericana de Óptica) - was officially established during RIAO-OPTILAS. One of its main tasks will be to delineate a general framework and guidelines for future sessions of RIAO-OPTILAS. The two next hosts have already been chosen: Portugal in 2013, and Chile in 2016. The contributions contained in the present issue of Journal of Physics: Conference Series cover a wide range of subjects in the optical sciences. They reflect the growing scientific production from the Iberoamerican region and provide the reader - or so we hope - with valuable information on what is being developed by several representative research groups of that region. Finally, I would like to gratefully acknowledge the valuable contribution of the Editorial Committee: Guillermo Baldwin (Chairman of RIAO-OPTILAS 2010)Departamento de Ciencias, Sección Física,Pontificia Universidad Católica del Perú Enrique J GalvezDepartment of

  41. EDITORIAL: XIII Mexican Workshop on Particles and Fields

    NASA Astrophysics Data System (ADS)

    Barranco, Juan; Contreras, Guillermo; Delepine, David; Napsuciale, Mauro

    2012-08-01

    is just a set of foundations and a portal, considered national monuments. There, we enjoyed a delicious meal in the cellars of the Corralejo Hacienda before returning to Leon. The XIII MWPF was sponsored by several institutions: Consejo Nacional de Ciencia y Tecnología (CONACyT) through the Red Nacional de Física de Altas Energías and individual research projects, Consejo de Ciencia y Tecnológico del Estado de Guanajuato (CONCyTEG), Universidad de Guanajuato, Universidad Nacional Autónoma de México, Universidad de Guanajuato, Centro de Investigaciones de Estudios Avanzados del IPN (CINVESTAV), Universidad Michoacana de San Nicolás de Hidalgo, Benemérita Universidad Autónoma de Puebla and Universidad Autónoma de San Luis Potosí. Also, we wish to thak to those who helped in the process of getting financial support for the meeting, specially Dr Juan Carlos D'Olivo, President of the Red Nacional de Física de Altas Energías and Dr José Luis Lucio Martínez, Rector of Universidad de Guanajuato, Campus León. These proceedings have been published thanks to the support of PIFI 2011. This meeting was possible due to the commitment of the working groups and we wish to thank to their members for the decisive collaboration with the organizing committee. At the local level, we thank our graduate students: Carolina Luján, Vannia González, Selim Gomez and Carlos Alberto Vaquera for their invaluable contribution in the organization of the large amount of small but important things around the meeting. Finally, we would like to thank all the speakers for delivering excellent talks which contributed to the success of the event. We are also grateful to all the participants for the nice academic and social atmosphere during the meeting and for providing their write-ups on time. The National organizing committee was formed by Arnulfo Zepeda (CINVESTAV-DF) Guillermo Contreras (CINVESTAV-Mérida) David Delepine (DF-UG) Axel de la Macorra (IAC/IF-UNAM) Lorenzo Díaz (BUAP

  42. ALMA Partners Award Prototype Antenna Contracts in Europe and the USA

    NASA Astrophysics Data System (ADS)

    2000-03-01

    prototype antennas will be delivered to the NRAO VLA site in October and November of 2001, respectively. Preparations for ALMA prototype testing are already underway at the VLA site. Three pads are being constructed for the antennas to rest on. An ALMA control room within the VLA control building is being established. About ten full-time ALMA staff will be involved in the testing. Additionally, ALMA project members from around the U.S. and the world will visit the VLA site to participate in the test program. The two prototype antennas will first be tested separately. Following that, the two will be linked together and tested as an interferometer. Millimeter-wave astronomy is the study of the universe in the spectral region between what is traditionally considered radio waves and infrared radiation. In this realm, ALMA will study the structure of the early universe and the evolution of galaxies; gather crucial data on the formation of stars, protoplanetary disks, and planets; and provide new insights on the familiar objects of our own solar system. ALMA is an international partnership between the United States (National Science Foundation) and Europe. European participants include the member states of the European Southern Observatory (Belgium, Denmark, France, Germany, Italy, the Netherlands, Sweden and Switzerland), the Centre National de la Recherche Scientifique (CNRS) in France, the Max-Planck Gesellschaft (Germany), the Netherlands Foundation for Research in Astronomy, the United Kingdom Particle Physics and Astronomy Research Council (PPARC), the Oficina de Ciencia Y Tecnologia/Instituto Geografico Nacional OCYT/IGN (Spain) and the Swedish Natural Science Research Council (NFR). The project is currently in a Design and Development phase governed by a Memorandum of Understanding between the United States and Europe. Negotiations are currently underway to add Canada to the United States team. Note [1] This Press Release is published simultaneously by the U.S. National

    1. U.S., European ALMA Partners Award Prototype Antenna Contracts

      NASA Astrophysics Data System (ADS)

      2000-03-01

      ) elevation. All previous millimeter-wavelength antennas that meet such exacting specifications for surface accuracy and pointing accuracy have been housed within telescope enclosures. The U.S. and European prototype antennas will be delivered to the NRAO VLA site, near Socorro, New Mexico, in October and November of 2001, respectively. Preparations for ALMA prototype testing are already underway at the VLA site. Three pads are being constructed for the antennas to rest on. An ALMA control room within the VLA control building is being established. About ten full-time ALMA staff will be involved in the testing. Additionally, ALMA project members from around the U.S. and the world will visit the VLA site to participate in the test program. The two prototype antennas will first be tested separately. Following that, the two will be linked together and tested as an interferometer. Millimeter-wave astronomy is the study of the universe in the spectral region between what is traditionally considered radio waves and infrared radiation. In this realm, ALMA will study the structure of the early universe and the evolution of galaxies; gather crucial data on the formation of stars, protoplanetary disks, and planets; and provide new insights on the familiar objects of our own solar system. ALMA is an international partnership between the United States (National Science Foundation) and Europe. European participants include the member states of the European Southern Observatory (Belgium, Denmark, France, Germany, Italy, the Netherlands, Sweden and Switzerland), the Centre National de la Recherche Scientifique (France), the Max-Planck Gesellschaft (Germany), the Netherlands Foundation for Research in Astronomy, the United Kingdom Particle Physics and Astronomy Research Council, the Oficina de Ciencia Y Tecnologia/Instituto Geografico Nacional OCYT/IGN (Spain), and the Swedish Natural Science Research Council (NFR). The project is currently in a Design and Development phase governed by a

    2. A comparison between two permanent broad band ocean bottom seismometers in the western Mediterranean Sea

      NASA Astrophysics Data System (ADS)

      Frontera, T.; Deschamps, A.; Ugalde, A.; Jara, J. A.; Hello, Y.; Goula, X.; Olivera, C.

      2009-04-01

      The aim of this work is to compare two permanent broad band ocean bottom seismometers (OBS) in terms of noise conditions by taking to account their similar instrumentation types, but their very different site characteristics. Both OBS stations have Güralp CMG-3T three component broad band sensors and differential pressure gauges (DPG). The first sensor operates since August 2005 under the framework of a research project that aims to improve the knowledge of the seismicity and seismic risk in the Tarragona region (north eastern Spain). This pioneering project in Spain is being carried out by the Institut Geològic de Catalunya (IGC) and the Observatori de l'Ebre, in collaboration with the Spanish oil company Repsol Investigaciones Petrolíferas, and is being financed by the Ministerio de Educación y Ciencia (CASABLANCA REN2003-06577), FEDER funding, the IGC and the Institut Cartogràfic de Catalunya. The OBS is installed inside the security perimeter of the Casablanca oil platform, which is located 40 km offshore Tarragona. The sensors are submerged at about 400 m to the SW of the oil platform at about 150 m in depth. Data are digitized on-site and are transmitted through a submarine cable to the platform, where they are recorded. In July 2007 some improvements were made: i) the OBS was completely buried and the DPG was moved about 10 m away from the OBS; and ii) via satellite signal transmission was implemented, which allowed to have continuous and real time data in Barcelona so that the OBS could be integrated into the Catalan Seismic Network. The second seismometer operates in the frame of the Antares neutrino telescope project developed in Liguria Sea. Geoazur is carrying out the project of deployment of a broad band seismological instrument in the aim of developing the permanent sea floor observation knowledge necessary to characterize Ligurian Sea seismicity and seismic risk along French Riviera coast (SE France). The operation was facilitated by the

    3. European agreement on James Webb Space Telescope's Mid-Infrared Instrument (MIRI) signed

      NASA Astrophysics Data System (ADS)

      2004-06-01

      will contribute about 70 million Euros overall. The European institutions who signed the MIRI agreement with ESA are: the Centre Nationale des Etudes Spatiales (CNES), the Danish Space Research Institute (DSRI), the German Aerospace Centre (DLR), the Spanish Ministerio de Educación y Ciencia (MEC), the Nederlandse Onderzoekschool voor Astronomie (NOVA), the UK Particle Physics and Astronomy Research Council (PPARC) and the Swedish National Space Board (SNSB). Four European countries, Belgium, Denmark, Ireland and Switzerland contribute to MIRI through their participation into ESA’s Scientific Experiment Development programme (PRODEX). This is an optional programme, mainly used by smaller countries, by which they delegate to ESA the management of funding to develop scientific instruments. The delivery to NASA of the MIRI instrument is due for March 2009.

    4. Astronomical Perception of the Secondary School's Students in São Paulo's State School in Suzano City. (Spanish Title: Percepción Astronómica de Alumnos de la Enseñanza Media de la Red Estatal de San Pablo en la Ciudad de Suzano.) Percepção Astronômica de um Grupo de Alunos do Ensino Médio da Rede Estadual de São Paulo da Cidade de Suzano

      NASA Astrophysics Data System (ADS)

      França de Oliveira, Edilene; Voelzke, Marcos Rincon; Amaral, Luis Henrique

      2007-12-01

      Although Astronomy is one of the oldest Sciences in the world and many of its concepts are popular, it is possible to observe that a major part of the students do not know about them. This work aims to analyse the basic knowledge of the secondary school's students of a state school in the city of Suzano, related to the astronomical phenomena, which surround them. It was carried out a questionnaire of multiple choice to 34 students from the first grade, night classes, of the state school Batista Renzi. From the sample, 34 students, only 29.4% of them could understand the succession of the days; 20.6% could explain the seasons of the year and 20.6% had some idea about celestial objects nearer to the Earth. In turn, 67.6% correctly classified the Sun as a star; 55.9% related the Big Bang to the origin of Universe; only 20.6% identified the light-year as an unit of distance and 32.4% recognized a falling star as a meteor. The actual analysis was expanded to more 310 students of other classes, grades and periods of the same school. In this first stage, it can be noted the students' little discernment of the astronomical events and mainly the great confusion about the appropriate meaning of popular astronomical terms. Aunque la Astronomía es una de las ciencias más antiguas de la humanidad y muchos de los conceptos astronómicos son populares, se observa que una parcela significativa de los estudiantes se encuentra al margen de estas informaciones. El presente trabajo pretende analizar el nivel de conocimiento básico de los alumnos de la Enseñanza Media de la Red Estatal de la ciudad de Suzano con relación a los fenómenos astronómicos que los rodean. Con este objetivo fue elaborado un formulario constando de preguntas de selección múltipla, aplicado en el primer año nocturno de la Escuela Estatal Batista Renzi. En un universo de 34 alumnos se constató que solamente 29,4% comprendían la sucesión de los días; 20,6% explicaron correctamente las estaciones del

    5. ‘Everybody knows’, but the rest of the world: the case of a caterpillar-borne reproductive loss syndrome in dromedary camels observed by Sahrawi pastoralists of Western Sahara

      PubMed Central

      2013-01-01

      índrome de pérdida reproductiva en dromedarios transmitido por orugas y observado por pastores nómadas saharauis del Sáhara Occidental. Antecedentes Los conocimientos tradicionales de las comunidades locales de todo el mundo son una valiosa fuente de nuevas ideas e información para la ciencia. En este estudio, se utilizaron los conocimientos de etnoveterinaria de pastores saharauis del Sáhara Occidental con el fin de proponer una hipótesis científica sobre las interacciones competitivas entre los camellos y las orugas en el ecosistema del Sáhara. Métodos Entre los años 2005 y 2009, se realizaron 44 entrevistas semi-estructuradas a los pastores saharauis en los territorios administrados por la República Árabe Saharaui Democrática, Sáhara Occidental, mediante un diseño de muestreo por bola de nieve. Resultados Los pastores nómadas saharauis describieron un síndrome reproductivo transmitido por orugas, llamado duda, entre sus camellas. Sobre la base de los conocimientos saharauis sobre el duda y una revisión literaria exhaustiva, se propuso la siguiente hipótesis: 1) brotes esporádico de orugas de la familia Lasiocampidae (géneros Lasiocampa, Psilogaster o Streblote) en árboles de Acacia se pueden presentar después de fuertes lluvias en el ecosistema del Sáhara Occidental; 2) durante estos brotes, los camellos ingieren las orugas durante el pastoreo; 3) como consecuencia de esta ingestión, se producen abortos repentinos o partos de crías debilitadas. Apoyamos esta hipótesis mediante razonamiento inductivo basado en evidencia circunstancial y razonamiento analógico con síndromes similares en yeguas de los Estados Unidos y Australia. Conclusiones Este es el primer reporte de la posible existencia de un síndrome de pérdida reproductiva en camellos, transmitido por orugas. Se insinúa que estos síndromes son más comunes que lo que actualmente se conoce. Se sugieren investigaciones adicionales p

    6. Hydrogeology in North America: past and future

      NASA Astrophysics Data System (ADS)

      Narasimhan, T. N.

      2005-03-01

      'hydrogéologie est à la transition entre la volonté de découvrir de nouvelles ressources et l' exploitation la plus bénéfique au possible, et un management judicieux des ressources finies, interconnectées, qui sont vitales pour l' approvisionnement des hommes et autres formes de vie. Le futur de l' hydrogéologie sera dicté par la balance subtile dans laquelle intervient les cycles de l'hydrologie, de l'érosion, de la nutrition, et la décision d'une société technologique qui s'adapterait aux contraintes de la balance, ou qui continuerait d'exploiter les systèmes hydrologiques pour un bénéfice maximum. Par ailleurs il y a une nette tendance à inclure les aspects écologiques, les aspects environnementaux, et les changements humains qui pourraient être influencés par les modifications hydrogéologiques observées depuis une dizaine d'années. Este articulo es una retrospectiva sobre la evolución de la hidrogeología en Norte América en los pasados dos siglos, y una breve especulación de su futuro. La historia de la hidrogeología está marcada por desarrollos en muchos campos diferentes tal como hidrología de aguas subterráneas, mecánica de suelos, ciencia del suelo, geología económica, ingeniería del petróleo, geología estructural, geoquímica, geofísica, geología marina, y más recientemente, ecología. El campo se ha enriquecido por las contribuciones de investigadores distinguidos en todos esos campos. Actualmente, la hidrogeología se encuentra en transición de un estado de descubrir nuevos recursos y explotarlos eficientemente para un beneficio máximo, a un estado de gestión juiciosa de recursos finitos, interconectados, que son vitales para el sustento de humanos y otras cosas vivientes. El futuro de la hidrogeología posiblemente esté determinado por el balance sutil con el cual funcionan los ciclos nutricionales, erosionales e hidrológicos, y la decisión de una sociedad tecnológica para ya sea adaptarse a las restricciones impuestas por el

    7. Resonances and Tides in Natural Satellites Systems. (Breton Title: Ressonâncias e Marés em Sistemas de Satélites Naturais.) Resonancias y Mareas en Sistemas de Satélites Naturales

      NASA Astrophysics Data System (ADS)

      Callegari, Nelson, Jr.

      2006-12-01

      sica, e não a descrição detalhada dos conceitos aqui discutidos. Describimos en este trabajo algunos aspectos de la dinámica de resonancias de movimientos promedio. Será dado un énfasis mayor al caso de las resonancias entre satélites regulares de los planetas gigantes, aunque también son discutidos brevemente algunos aspectos de la física de resonancias en sistemas panetarios extrasolares. La importancia del estudio de las resonancias en sistemas de satélites es discutida más detalladamente através de ejemplos, mostrando cómo ciertas resonancias y los efectos de disipación por mareas pueden ser la clave de parte de la explicación de algunos fenómenos aún no comprendidos en el Sistema Solar. Entre varios ejemplos se destacan el problema de la superficie remodelada del satélite Enceladus, la existencia de volcanes activos en Io y la posible existencia de un océano subterráneo en Europa. Este trabajo tiene como objetivo la divulgación de algunos tópicos en Mecánica Celeste y Planetología para un público universitario de ciencias exactas, en particular Astronomía y Física, y no la descripción detallada de los conceptos aquí discutidos.

    8. A comparison between two permanent broad band ocean bottom seismometers in the western Mediterranean Sea

      NASA Astrophysics Data System (ADS)

      Frontera, T.; Deschamps, A.; Ugalde, A.; Jara, J. A.; Hello, Y.; Goula, X.; Olivera, C.

      2009-04-01

      The aim of this work is to compare two permanent broad band ocean bottom seismometers (OBS) in terms of noise conditions by taking to account their similar instrumentation types, but their very different site characteristics. Both OBS stations have Güralp CMG-3T three component broad band sensors and differential pressure gauges (DPG). The first sensor operates since August 2005 under the framework of a research project that aims to improve the knowledge of the seismicity and seismic risk in the Tarragona region (north eastern Spain). This pioneering project in Spain is being carried out by the Institut Geològic de Catalunya (IGC) and the Observatori de l'Ebre, in collaboration with the Spanish oil company Repsol Investigaciones Petrolíferas, and is being financed by the Ministerio de Educación y Ciencia (CASABLANCA REN2003-06577), FEDER funding, the IGC and the Institut Cartogràfic de Catalunya. The OBS is installed inside the security perimeter of the Casablanca oil platform, which is located 40 km offshore Tarragona. The sensors are submerged at about 400 m to the SW of the oil platform at about 150 m in depth. Data are digitized on-site and are transmitted through a submarine cable to the platform, where they are recorded. In July 2007 some improvements were made: i) the OBS was completely buried and the DPG was moved about 10 m away from the OBS; and ii) via satellite signal transmission was implemented, which allowed to have continuous and real time data in Barcelona so that the OBS could be integrated into the Catalan Seismic Network. The second seismometer operates in the frame of the Antares neutrino telescope project developed in Liguria Sea. Geoazur is carrying out the project of deployment of a broad band seismological instrument in the aim of developing the permanent sea floor observation knowledge necessary to characterize Ligurian Sea seismicity and seismic risk along French Riviera coast (SE France). The operation was facilitated by the

    9. The role of the Spanish Committee of the International Association of Hydrogeologists in the management and protection of Spain's groundwater resources

      NASA Astrophysics Data System (ADS)

      Custodio, Emilio; Llamas, M.-Ramón; Villarroya, Fermín

      promouvoir des activités de diffusion des sciences, de la technologie et de la gestion de l'eau en Espagne et à l'étranger, surtout en Amérique latine, et pour tenter d'orienter la politique de l'eau à l'égard des eaux souterraines. Ces activités incluent principalement l'organisation de réunions techniques et scientifiques sur des sujets classiques tels que l'eau souterraine dans la nouvelle Loi sur l'Eau, la surexploitation, l'eau souterraine dans la gestion des ressources en eau, la pollution de l'eau souterraine, l'estimation des écoulements naturels, entre autres. Les retombées de ces activités sur la récente politique de l'eau en Espagne paraissent significatives et l'expérience acquise peut être appliquée à d'autres pays. Resumen España es un país relativamente grande (unos 500,000km2) con áreas extensas en las que existe un elevado número de buenos acuíferos. En algunas zonas estos acuíferos son intensamente aprovechados y constituyen el recurso más importante de agua dulce. Sin embargo, el aprovechamiento y la protección de las aguas subterráneas pocas veces han sido debidamente considerados por la Administración hidráulica española, a pesar de la presión ejercida por distintos grupos y por algunos miembros responsables de la propia Administración hidráulica para corregir esta situación. Durante el último decenio el Comité Español de la Asociación Internacional de Hidrogeólogos (AIH) ha sido muy activo en promover reuniones para difundir la ciencia, la tecnología y la adecuada gestión del agua subterránea en España y en el extranjero, especialmente en Ibero-América. También ha intentado que los temas referentes al agua subterránea tuviesen la oportuna consideración en la política hidrológica general. Estas actividades han consistido principalmente en la organización de reuniones científicas y técnicas sobre temas actuales tales como el agua subterránea en la planificación hidrológica, contaminación del agua

    10. Solar Physics Topics in High School: Analysis of a Course with Practical Activities at Dietrich Schiel Observatory. (Spanish Title: Temas de Física Solar Para Estudiantes de Escuelas Secundarias: un Análisis de un Curso con Enfoque Práctico en el Observatorio Dietrich Schiel.) Tópicos de Física Solar no Ensino Médio: Análise de um Curso com Atividades Práticas no Observatório Dietrich Schiel

      NASA Astrophysics Data System (ADS)

      Calbo Aroca, Silvia; Donizete Colombo, Pedro, Jr.; Celestino Silva, Cibelle

      2012-12-01

      algunos estudiantes sabían que un espectro puede estar formado por un prisma o red de difracción, la mayor parte de ellos desconocía la naturaleza de las líneas espectrales. A lo largo del curso, esta cuestión fue trabajada con un enfoque práctico mediante la observación del espectro solar y de las lámparas durante clases expositivas/dialogadas. Los resultados obtenidos en el curso mustran la importancia de los centros de ciencia como un apoyo en la educación formal. En este caso en particular, la Sala Solar del Observatorio Dietrich Schiel se destaca como un entorno favorable para la enseñanza de la física moderna en la escuela secundaria. Este trabalho analisa resultados obtidos em um curso sobre física solar para alunos do ensino médio promovido pelo Observatório Dietrich Schiel da USP. O curso foi elaborado pelos autores com a intenção de investigar concepções sobre o Sol, ensinar tópicos de física moderna relacionados ao Sol e conhecimentos gerais sobre o astro rei. A metodologia de coleta de dados consistiu em gravação em áudio e vídeo das aulas e das entrevistas semi-estruturadas, e respostas a questionários escritos. Os resultados mostraram que a maioria dos participantes concebeu o Sol como constituído por fogo e as manchas solares como buracos na superfície solar. Embora alguns alunos soubessem que um espectro pode ser formado por um prisma ou rede de difração, a maior parte deles desconhecia a natureza das linhas espectrais. Ao longo do curso, este tema foi trabalhado com uma abordagem prática com observação do espectro solar e de lâmpadas e em aulas expositivo-dialogadas. Os resultados obtidos no curso apontam para a importância dos centros de ciências como parceiros da educação formal. Neste caso específico, a Sala Solar do Observatório Dietrich Schiel é um ambiente propício para o ensino de física moderna no ensino médio.

    11. Some advance on the comprehension of SR analysis for estimating the flux of a scalar

      NASA Astrophysics Data System (ADS)

      Castellví, Dr

      2009-04-01

      loss of scalar (heat for temperature) through the air parcel top, and (3) Molecular diffusion within the air parcel can be neglected. According to the new α parameter expression derived, it is shown that the half-hourly α value is related to the capability of turbulence to mix the scalar within the air parcel during the enrichment (depletion) phase. The expression depends on the variance of the scalar associated to isotropic turbulence over the total (organized and isotropic). The α expression suggests that half-hourly α values are in the range, 0 < α ≤ 1, at least when measurements are taken in the inertial sub-layer over vegetated surfaces. Acknowledgments The author gratefully acknowledges K.T. Paw U and R.L Snyder for his encouragement in doing this study. This work was supported by the TRANSCLA project and a fellowship from the Ministerio de Ciencia y Innovaci

    12. FOREWORD: TAUP 2005: Proceedings of the Ninth International Conference on Topics in Astroparticle and Underground Physics

      NASA Astrophysics Data System (ADS)

      Bottino, Alessandro; Coccia, Eugenio; Morales, Julio; Puimedónv, Jorge

      2006-04-01

      qualities, was illustrated. The TAUP Steering Committee recalls with deep gratitude that John Bahcall served continuously as a member of the TAUP International Advisory Committee and that he gave an inspired and brilliant conclusive talk at TAUP 2003 in Seattle. Our astroparticle community will miss him greatly. The TAUP 2005 Organizing Committee thanks Ministerio de Educación y Ciencia, Gobierno de Aragón, Zaragoza University, INFN, IUPAP, PaNAGIC and Ibercaja for sponsoring the Conference, and the Rector and Vice-Rector of the Zaragoza University for their hospitality in the magnificent Paraninfo Palace, where the meeting was held. We wish to thank Venya Berezinsky, José Bernabéu and José Angel Villar for their invaluable contribution in the scientific shaping of the conference and in the preparation of the present volume. Very special thanks are due to Ms Mercedes Fatás and Ms Franca Masciulli, our workshop secretaries, for their continuous and excellent work in the organization of the conference, and to Ms Leopolda Benazzato for her invaluable assistance during the conference. We also gratefully thank the technical staff: Cristina Gil, Francisco Javier Mena and Alfonso Ortiz de Solórzano for their invaluable help. As announced at the end of the conference, TAUP 2007 will be held in Sendai, Japan, hosted by the Tohoku University with the chairs of Professors Atsuto Suzuki and Kunio Inoue. COMMITTEES TAUP STEERING COMMITTEE F. T. Avignone, U. South Carolina B. Barish, CALTECH E. Bellotti, U. Milano/INFN J. Bernabéu, U. Valenciav A. Bottino (chair), U. Torino/INFN V. de Alfaro, U. Torino/INFN T. Kajita, ICRR Tokyo C. W. Kim, JHU Baltimore/KIAS Seoul E. Lorenz U. München V. Matveev, INR Moscow J. Morales, U. Zaragoza D. Sinclair, U. Carleton TAUP 2005 INTERNATIONAL ADVISORY COMMITTEE J. J. Aubert, CNRS Marseille J. Bahcall, U. Princeton M. Baldo-Ceolin, U. Padova/INFN L. Bergström, U. Stockholm R. Bernabei, U. Roma Tor Vergata/INFN A. Bettini, U. Padova/INFN S

    13. Aquifers and hyporheic zones: Towards an ecological understanding of groundwater

      NASA Astrophysics Data System (ADS)

      Hancock, Peter J.; Boulton, Andrew J.; Humphreys, William F.

      2005-03-01

      biotopes souterrains à des études multidisciplinaires qui intègrent l'écologie et l'hydrogéologie. L'approche multidisciplinaire cherche à élucider le fonctionnement des écosystèmes souterrains et leur rôle consistant à maintenir la qualité des eaux souterraines et de surface. Dans les écotones des eaux de la surfaces des aquifères, les gradients géochimiques et les biofilms microbiologiques contrôlent les transformations de la qualité de l'eau. La faune de subsurface (stygofauna) construisent les biofilms, altèrent la taille des pores interstitiels à travers leur mouvement, et transportent physiquement des matériaux à travers l'environnement des eaux souterraines. Par ailleurs, les changements de leur population signalent un déclin de la qualité de l'eau. Une meilleure intégration de l'écologie des eaux souterraines, de la biogeochimie, et de l'hydrogéologie pourra faire avancer de manière efficace de notre compréhension des écosystèmes souterrains, et spécialement en terme de bioremédiation des eaux souterraines contaminées, de maintenance et d'amélioration de la qualité des eaux de surface dépendant des écosystèmes souterrains, et l'amélioration de la protection des habitats des eaux souterraines durant l'extraction des ressources naturelles. En général, cela conduira à une meilleure compréhension de l'implication de l'hydrogéologie et de la géologie des aquifères à la distribution de la faune de subsurface et aux microbiota, aux processus écologiques tels que les cycles du carbone, et la gestion durable des eaux souterraines. Los entornos ecológicos en ambientes subsuperficiales están relacionados directamente con el flujo de agua subterránea, la conductividad hidráulica, biogeoquímica intersticial, tamaño de los poros, y vínculos hidrológicos con acuíferos adyacentes y ecosistemas superficiales. La ecología del agua subterránea ha evolucionado a partir de una ciencia que describe la biota subterránea única

    14. High School Students' Previous Knowledge about the Stars. (Spanish Title: Conocimientos Previos de Estudiantes de Secundaria Acerca de Las Estrellas.) O Conhecimento Prévio de Alunos do Ensino Médio sobre as Estrelas

      NASA Astrophysics Data System (ADS)

      Iachel, Gustavo

      2011-12-01

      reconocen que una estrella es formada por una masa de gas; varios conocimientos previos parten de aspectos puramente visuales; por otro lado, los estudiantes no tienen el hábito de observar la naturaleza detalladamente, entre otros problemas. Vemos esta investigación como una probable fuente de referencia en la que los profesores de ciencias pueden reconocer la importancia del conocimiento previo, y la forma como interfieren con su práctica de enseñanza, además de la adquisición de recursos para la planificación de sus clases. Com base em leituras de artigos relacionados ao ensino de Astronomia publicados no Brasil, verificou-se a inexistência de investigações sobre o conhecimento prévio de estudantes acerca das características físicas das estrelas, fato que nos motivou a desenvolver a pesquisa apresentada. Os conhecimentos prévios de 125 estudantes do primeiro ano do ensino médio constituíram os dados do estudo, os quais foram inferidos através da análise das respostas cedidas em questionários impressos (Apêndice A). A partir da análise de conteúdo dessas respostas tornou-se possível realizar algumas inferências como, por exemplo: vários estudantes possuem dificuldade em elaborar um modelo explicativo sobre o funcionamento de uma estrela; são poucos os que dizem que as estrelas possuem certo tempo de existência; alguns alunos as imaginam com pontas; poucos reconhecem que uma estrela é formada por uma massa de gás; vários conhecimentos prévios partem de aspectos meramente visuais; ainda assim, os estudantes não possuem o hábito de observar a natureza mais detalhadamente, entre outras. Vemos essa pesquisa como uma provável fonte de consulta na qual os professores de ciências poderão, além de reconhecer a importância dos conhecimentos prévios para o ensino e como eles interferem em sua prática, adquirir subsídios para o planejamento de suas aulas.

    15. Some advance on the comprehension of SR analysis for estimating the flux of a scalar

      NASA Astrophysics Data System (ADS)

      Castellví, Dr

      2009-04-01

      loss of scalar (heat for temperature) through the air parcel top, and (3) Molecular diffusion within the air parcel can be neglected. According to the new  parameter expression derived, it is shown that the half-hourly value is related to the capability of turbulence to mix the scalar within the air parcel during the enrichment (depletion) phase. The expression depends on the variance of the scalar associated to isotropic turbulence over the total (organized and isotropic). The  expression suggests that half-hourly values are in the range, 0 <  ≤ 1, at least when measurements are taken in the inertial sub-layer over vegetated surfaces. Acknowledgments The author gratefully acknowledges K.T. Paw U and R.L Snyder for his encouragement in doing this study. This work was supported by the TRANSCLA project and a fellowship from the Ministerio de Ciencia y Innovación of Spain. References Brutsaert W. 1988. Evaporation into the atmosphere. D. Reidel P.C: Doordrech; 299. Castellvi F, Snyder RL. 2008. Combining the Dissipation method and Surface Renewal analysis to estimate Scalar Fluxes from the time traces over rangeland grass near Ione (California). Hydrol. Proccesses, In Press. Edson JB, Fairall CW. 1998. Similarity Relationships in the Marine Atmospheric Surface Layer for terms on the TKE and Scalar Variance Budgets. Journal of Atmospheric Sciences 55: 2311-2328. Fairall CW, Larsen SE. 1986. Inertial-dissipation methods and turbulent fluxes at the air-ocean interface. Boundary Layer Meteorology 34: 287-301. Hsieh CI, Katul GG. 1997. Dissipation methods, Taylor's hypothesis, and stability correction functions in the atmospheric surface layer. Journal of Geophysical Research 102: (14), 16391-16405. Kader BA. 1992. Determination of turbulent momentum and heat fluxes by spectral methods. Boundary Layer Meteorology 61: 323-347. Kaimal JC, Finnigan JJ. 1994. Atmospheric Boundary Layer Flows. Oxford Univ. Press; 289. Panofsky H, Dutton J. 1984. Atmospheric

    16. Efectos difusivos en la formación de enanas blancas de Helio de baja masa en sistemas binarios cerrados

      NASA Astrophysics Data System (ADS)

      De Vito, M. A.; Benvenuto, O. G.

      In the last years, and thanks to advances in observational techniques, many astronomers have discovered in a great number of binary radio-pulsars the presence of a helium white dwarf resulting from a previous evolutionary state in which the progenitor of this star experienced one or more episodes of mass transfer to the compact component in the pair. That is the case for PSR B1855+09 (van Kerkwijk, M. H., Bell, J. F, Kaspi, V. M., & Kulkarni, S. R. 2000, ApJ 530, L37), where the mass for the white dwarf is known accurately from measurements of the Shapiro delay of the pulsar signal, MWD = 0.258+0.028-0.016 M⊙; for PSR J02018 + 4232 (Bassa, C. G., van Kerkwijk, M. H., & Kulkarni, S. R. 2003, A&A, 403, 1067), the spectra confirm that the companion is a helium-core white dwarf of ≈ 0.2 M⊙. On the other hand, there are several authors (Ferraro, F., Possenti, A., Sabbi, E., & D'Amico, N. 2003, ApJ, 596, L211; Bassa et al. 2003) that have identified the optical binary companion to the BMSP PSR J1911 - 5958A, located in the halo of the Galactic globular cluster NGC 6752, like a blue star whose position in the color-magnitude diagram is consistent with the cooling sequence of a low-mass, ≈ 0.17 - 0.20 M⊙, low metallicity helium white dwarf at the cluster distance. Finally, the color and magnitude of the stellar companion for B 1620-26 indicate that is a white dwarf of 0.34 ± 0.04 M⊙ (Sigurdson, S., Richer, H. B., Hansen, B. M., Stairs, I. H. & Thorset, S. E. 2003, Science, 301, 193S). This has motivated us to study the formation of low mass helium white dwarfs in the context of binary evolution. For that purpose, using the code of binary evolution, entirely developed in the Facultad de Ciencias Astronómicas y Geofísicas of the Universidad Nacional de La Plata, Argentina, we have investigated the effects of diffusive processes on the evolution of a star member of a close binary system. A similar study was performed for Althaus, L. G., Serenelli, A. M

    17. Aquifers and hyporheic zones: Towards an ecological understanding of groundwater

      NASA Astrophysics Data System (ADS)

      Hancock, Peter J.; Boulton, Andrew J.; Humphreys, William F.

      2005-03-01

      biotopes souterrains à des études multidisciplinaires qui intègrent l'écologie et l'hydrogéologie. L'approche multidisciplinaire cherche à élucider le fonctionnement des écosystèmes souterrains et leur rôle consistant à maintenir la qualité des eaux souterraines et de surface. Dans les écotones des eaux de la surfaces des aquifères, les gradients géochimiques et les biofilms microbiologiques contrôlent les transformations de la qualité de l'eau. La faune de subsurface (stygofauna) construisent les biofilms, altèrent la taille des pores interstitiels à travers leur mouvement, et transportent physiquement des matériaux à travers l'environnement des eaux souterraines. Par ailleurs, les changements de leur population signalent un déclin de la qualité de l'eau. Une meilleure intégration de l'écologie des eaux souterraines, de la biogeochimie, et de l'hydrogéologie pourra faire avancer de manière efficace de notre compréhension des écosystèmes souterrains, et spécialement en terme de bioremédiation des eaux souterraines contaminées, de maintenance et d'amélioration de la qualité des eaux de surface dépendant des écosystèmes souterrains, et l'amélioration de la protection des habitats des eaux souterraines durant l'extraction des ressources naturelles. En général, cela conduira à une meilleure compréhension de l'implication de l'hydrogéologie et de la géologie des aquifères à la distribution de la faune de subsurface et aux microbiota, aux processus écologiques tels que les cycles du carbone, et la gestion durable des eaux souterraines. Los entornos ecológicos en ambientes subsuperficiales están relacionados directamente con el flujo de agua subterránea, la conductividad hidráulica, biogeoquímica intersticial, tamaño de los poros, y vínculos hidrológicos con acuíferos adyacentes y ecosistemas superficiales. La ecología del agua subterránea ha evolucionado a partir de una ciencia que describe la biota subterránea única

    18. Hydrogeology in North America: past and future

      NASA Astrophysics Data System (ADS)

      Narasimhan, T. N.

      2005-03-01

      'hydrogéologie est à la transition entre la volonté de découvrir de nouvelles ressources et l' exploitation la plus bénéfique au possible, et un management judicieux des ressources finies, interconnectées, qui sont vitales pour l' approvisionnement des hommes et autres formes de vie. Le futur de l' hydrogéologie sera dicté par la balance subtile dans laquelle intervient les cycles de l'hydrologie, de l'érosion, de la nutrition, et la décision d'une société technologique qui s'adapterait aux contraintes de la balance, ou qui continuerait d'exploiter les systèmes hydrologiques pour un bénéfice maximum. Par ailleurs il y a une nette tendance à inclure les aspects écologiques, les aspects environnementaux, et les changements humains qui pourraient être influencés par les modifications hydrogéologiques observées depuis une dizaine d'années. Este articulo es una retrospectiva sobre la evolución de la hidrogeología en Norte América en los pasados dos siglos, y una breve especulación de su futuro. La historia de la hidrogeología está marcada por desarrollos en muchos campos diferentes tal como hidrología de aguas subterráneas, mecánica de suelos, ciencia del suelo, geología económica, ingeniería del petróleo, geología estructural, geoquímica, geofísica, geología marina, y más recientemente, ecología. El campo se ha enriquecido por las contribuciones de investigadores distinguidos en todos esos campos. Actualmente, la hidrogeología se encuentra en transición de un estado de descubrir nuevos recursos y explotarlos eficientemente para un beneficio máximo, a un estado de gestión juiciosa de recursos finitos, interconectados, que son vitales para el sustento de humanos y otras cosas vivientes. El futuro de la hidrogeología posiblemente esté determinado por el balance sutil con el cual funcionan los ciclos nutricionales, erosionales e hidrológicos, y la decisión de una sociedad tecnológica para ya sea adaptarse a las restricciones impuestas por el

    19. Astronomy, Art and Mythology in a Public Elementary School in Itaocara/rj. (Spanish Title: Astronomía, Arte y Mitologia en el Ensino Fundamental en Una Escuela de la Red Estatal en ITAOCARA/RJ.) Astronomia, Arte e Mitologia no Ensino Fundamental em Escola da Rede Estadual em ITAOCARA/RJ

      NASA Astrophysics Data System (ADS)

      Oliveira Bernardes, Adriana; Ramos dos Santos, Arleidimar

      2008-12-01

      Volunteer advisors at Itaocara Astronomy Club Marcos Pontes(CAIMP), in their majority high school students, introduced students at Teotônio Brandão Vilela Elementary School to basic concepts in Astronomy, Physics, and Mythology. Computer Science, Arts, puppetry, and educational videos were used to stimulate students to share their feelings and test their knowledge of the concepts presented. The work done by the volunteers helped boost the student's self-esteem and improved their oral skills by applying their knowledge of Physics and Astronomy in Lab experiments. The main goals of the CAIMP are the possibility of including astronomy in Elementary school curricula and developing an interdisciplinary work involving Astronomy, Arts, and Mythology. Through tests and reports, the students who participated in the Brazilian Astronomy Olympics, showed an increase in their knowldge of the sujects presented during the volunteer work. Durante el curso de un trabajo voluntario con estudiantes de nivel primario (1 º a 4 º grado), los guías de Astronomía miembros del CAIMP (Club de Astronomía de Itaocara "Marcos Puentes"), en su mayoría estudiantes secundarios, desarrollaron un trabajo de introducción a las Ciencias y Astronomía con alumnos del colegio estatal Teotônio Vilela Brandão. A través de talleres de informática, artes, videos educativos y teatro de títeres, los estudiantes pudieron expresar sus conocimientos y emociones frente a las leyendas mitológicas con las que se inició el trabajo de introducción. La labor desarrollada por los guías con los alumnos promovió la integración entre las aulas del colegio haciéndolos participar en actividades con el fin de estimular su expresión verbal y aumentar su autoestima. Trabajando diversas formas de expresión, los alumnos pudieron realizar experimentos y conocer algunos conceptos de Física y Astronomía al mismo tiempo que adquirían autonomía para la libre expresión de sus sentimientos y de los

    20. Astronomy Teaching in Argentina in the 19th Century. (Spanish Title: La Enseñanza de la Astronomía en la Argentina del Siglo XIX.) O Ensino de Astronomia na Argentina no Século XIX

      NASA Astrophysics Data System (ADS)

      Norberto Cornejo, Jorge; Santilli, Haydée

      2010-12-01

      Sarmiento believed that Copernican astronomy was one of the critical scientific disciplines to the formation of a "modern" citizen. In this work, we shall study astronomical science from two points of view: from the scientific knowledge and the educational presentation of such knowledge. Our study will address in Argentina in 19th century, starting from the initiative of Bernardino Rivadavia in 1821, who founded an astronomic observatory at Buenos Aires, until the first activities of the observatories at Córdoba and La Plata. On both lines, scientific and educative, we shall analyze the influence of positivist ideas. We shall highlight epistemological differences between both observatories, Córdoba's based on French positivism and La Plata's based on German positivism. We shall also show the different attitude of both observatories towards education. We shall see the way in which positivist ideas had great relevance in the training of elementary school teachers. We shall also establish the relevant influence of the socio-historical context over the astronomical development, and show that astronomy was a fundamental social factor at Argentina history. Domingo F. Sarmiento consideraba que la astronomía copernicana era una de las disciplinas científicas fundamentales para la conformación de un ciudadano "moderno". En este trabajo estudiaremos la ciencia astronómica desde dos vertientes: la referida específicamente al conocimiento científico y aquella vinculada con la presentación educativa de dicho conocimiento. Nuestro estudio se desarrollará en Argentina durante el siglo XIX, desde la iniciativa de Bernardino Rivadavia en 1821, de establecer en Buenos Aires un observatorio astronómico, hasta las primeras actividades de los observatorios de Córdoba y de La Plata. En ambas vertientes, científica y educativa, analizaremos la influencia de las ideas positivistas. Resaltaremos las diferencias epistemológicas entre los dos observatorios, orientado el primero