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Sample records for san piero a grado pisa reactor

  1. Development of Reference Data Set (RDS) for LOBI-MOD2 Integral Test Facility- IAEA Fellowship Training at Nuclear Research Group of San Piero A Grado (GRNSPG), University of PISA, Italy

    International Nuclear Information System (INIS)

    Mohd Rizal Mamat

    2013-01-01

    Deterministic Safety Analysis (DSA) is one of the mandatory requirements conducted for Nuclear Power Plant licensing process in order to ensure compliance with relevant regulatory acceptance criteria. DSA is a technique whereby a set of conservative deterministic rules and requirements are applied for the design and operation of facilities or activities. Computer codes are normally used to assist in performing all required analysis under DSA. In order to ensure a comprehensive analysis, the conduct of DSA should follow a systematic approach. One of the methodologies proposed is the Standardised and Consolidated Reference Experimental (and Calculated) Database (SCRED) developed by University of Pisa which describes the whole processes or steps involved in the preparation of complete database for system thermal-hydraulic code applications for facilities or plants. Under this methodology, the use of Reference Data Set (RDS) as a pre-requisite reference document for developing input nodalization for system thermal-hydraulics code simulation has been proposed. This paper describes the experience of having undergone 2 months of IAEA Fellowship training at Nuclear Research Group of San Piero A Grado (GRNSPG) in University of PISA, Italy and the application of RDS and its effectiveness. Two RDS documents have been developed for an Integral Test Facility of LOBI-MOD2 facility and Test A1-83, 10% small cold leg break LOCA (Loss of Coolant Accident). (author)

  2. Técnicas constructivas altomedievales en la ciudad de Pisa y en la Toscana nordoccidental

    Directory of Open Access Journals (Sweden)

    Quirós Castillo, Juan Antonio

    2005-12-01

    Full Text Available The present work analyses the building techniques used in the city of Pisa in the Early Middle Ages. Four ecclesiastical constructions are precisely studied (San Piero a Grado, San Zeno, Santa Cristina, San Matteo, leading to the understanding of the transformations that have taken place in the organizational structure of the architectural production. It is also paid specific attention to the constructive materials, to the diachronic evolution of the building techniques in the territory of Pisa and to the zeal that has supposed the realization of the Early Middle Ages religious architecture through the analysis of the volumetric dimensions of these constructions. Lastly, a social reading of the architectural production from the 5th to the 10th centuries is carried out.En el presente trabaja se analizan las técnicas constructivas empleadas en la ciudad de Pisa en la Alta Edad Media. Más concretamente se estudian de forma detallada cuatro construcciones eclesiásticas (San Piero a Grado, San Zeno, Santa Cristina, San Matteo, a través de las cuales es posible comprender las transformaciones que han tenido lugar en la estructura organizativa de la producción arquitectónica. Se presta igualmente una atención específica a los materiales constructivos, a la evolución diacrónica de las formas de construir en el territorio pisano y al empeño que ha supuesto la realización de la arquitectura religiosa altomedieval a través del análisis de las dimensiones volumétricas de estas construcciones. Por último se realiza una lectura social de la producción arquitectónica en los siglos V-X.

  3. Piero della Francesca's Sky in The Dream of Constantine

    Science.gov (United States)

    Valerio, V.

    2011-06-01

    The recent restoration of the frescoes by Piero della Francesca in the Church of San Francesco in Arezzo has made to appear on the background of the scene of Constantine's dream a number of stars. They are clearly painted with the intention to illustrate a sort of "natural" sky. In 2001 Anna Maria Maetzke recognized in a group of stars the constellation of the Ursa Minor, but so far no further study has been carried on to find any relation between the painted and the true sky. In this paper I show the existence of more constellations in the fresco, which are hardly detectable due to the mirror representation of the starry sky. Such a mirror image, as the Universe was seen from the outside, has a Greek origin and this kind of representation was introduced in Western Europe not only in celestial globes but also in star maps. This discovery leads to consider that Piero had at his disposal either a globe or a map which he reproduced on the fresco. My hypothesis is that a star map might be supplied to Piero by the astronomer Regiomontanus who was in Italy since 1461 following the Cardinal Bessarion in his journey from Wien to Rome. In 1463, Cardinal Bessarion was named papal legate to Venice and in July of the same year he leaved Rome together with Regiomontanus to reach Ferrara and Venice. The road to Venice crossed Umbria nearby Sansepolcro, Piero's birthplace not far from Arezzo. The trip took more than two weeks due to a stop before crossing the Apennines because the plague in Ferrara. Bessarion and Regiomontanus might have met Piero who was painting the cycle of frescoes in Arezzo and supplied him with a star map. Unfortunately, due to the lack of the horizon and any right line in the scene it is not possible to detect the latitude of the place corresponding to the painted sky.

  4. Psychometric properties of the Slovenian version of temperament evaluation of Memphis, Pisa, Paris, and San Diego-Autoquestionnaire (TEMPS-A): temperament profiles in Slovenian university students.

    Science.gov (United States)

    Dolenc, Barbara; Sprah, Lilijana; Dernovšek, Mojca Z; Akiskal, Kareen; Akiskal, Hagop S

    2013-01-25

    TEMPS-A (Temperament Evaluation of Memphis, Pisa, Paris and San Diego-Autoquestionnaire) is a self-rated instrument that measures five affective temperaments: depressive, cyclothymic, hyperthymic, irritable, and anxious. The aim of our study was to examine the psychometric characteristics of the Slovenian TEMPS-A and to ascertain if temperament profile is related to the professions chosen by Slovenian students. 892 Slovenian university students in six different professional fields (economics, geography, engineering, law, sports pedagogy and nursing) were included in our study. Cronbach's reliability coefficients denoted acceptable internal consistency of the subscales. Principal component analysis revealed relatively good internal structure of the instrument. Nursing and geography students scored the highest on depressive temperament. Sports pedagogues as well as engineers demonstrated the most firm personality structure with distinctive hyperthymic temperament. Law students revealed the most irritable temperament, while nursing and law students scored the highest on anxious temperament. Sample of Slovenian students is not representative for general population. The structure of the sample was crucial as well, as it comprised mainly of younger students who just started their study. The Slovenian version of the TEMPS-A proved to have relatively good internal consistency and internal structure. The questionnaire verified as a reliable and valid instrument and generally in line with previous studies. This study strengthens the perspective that professional areas could be associated with distinct affective temperament profile that could influence career decisions. The findings in students of economics, geography, and sport pedagogy are new as they have not been previously investigated by TEMPS researchers. The results open new possibilities for future research. Copyright © 2012 Elsevier B.V. All rights reserved.

  5. Aprendizajes de las fracciones en estudiantes de séptimo grado del Instituto San Ramón en Río San Juan de Nicaragua

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    Paulino Aleman Gudiel

    2018-02-01

    Full Text Available Esta investigación ha analizado el aprendizaje de las fracciones en estudiantes de séptimo grado del Instituto San Ramón, en Río San Juan de Nicaragua. Fue de carácter cualitativa con la participación de 12 discentes de séptimo grado y un docente de matemática. Se aplicaron instrumentos como el test cognitivo, entrevista y la observación. Los resultados muestran que el estudiantado tiene dificultes de aprendizajes por falta de conocimientos previos, falta de interés y se evidencia inasistencia a las clases de matemáticas. Además, se evidencia que las competencias con el abordaje de la temática son empíricas. Todo lo cual conlleva a la incomprensión de las matemáticas. Es por ello, que se ha propuesto un plan que contribuya al mejoramiento del conocimiento didáctico y matemático de las fracciones de séptimo grado de Educación Secundaria.

  6. The Relevance and Consequences of PISA in a Danish Context

    DEFF Research Database (Denmark)

    Dolin, Jens; Krogh, Lars Brian

    2010-01-01

    ABSTRACT. This article reports a case study that described and analyzed the changes in the Danish school culture induced and encouraged by the Programme for International Student Assessment (PISA) results. The educational policy and reforms that were temporally connected with the publication of t......, different learning/assessment paradigms). We argue that such differences are crucial when considering curricular relevance, validity, and the use of PISA as an agent of change on the national level....

  7. Algunos problemas de interpretación en la teoría de precios de producción de Piero Sraffa

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    Guillén Romo Hector

    1981-12-01

    Full Text Available Aunque con el término "escuela neo-ricardiana" o "escuela de Cambridge" algunas veces se designa a las contribuciones de Joan Robinson, Nicholas Kaldor, Luigi Pasínetti y algunos otros á la teoría del crecimiento, en este ensayo nos referiremos casi exclusivamente a la teoría neo-ricardíana de los precios, tal y como ha sido elaborada por Piero Sraffa. Los fundamentos metodológicos de la escuela neo-ricardiana
    pueden ser encontrados en las obras de V. K. Dimitriev y L. Bortkiewicz, autores de finales del Siglo XIX e inicios del XX. La importancia de estos autores se ha visto particularmente incrementada en los últimos años, tras la publicación de la obra de Sraffa. La escuela neo-ricardiana puede ser analizada desde varios puntos de vista según que se consideren sus vínculos con la teoría marxista del valor o con la teoría neoclásica, ya sea en su versión vulgar (Jevons, Menger, Marshall o en su versión del equilibrio económico general (Arrow, Hahn, Malinvaud.

  8. Research Method and Phenomenological Pedagogy. Reflections from Piero Bertolini

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    Luca Ghirotto

    2016-10-01

    Full Text Available Inspired by Husserlian phenomenology, Piero Bertolini defined the phenomenological pedagogy and education as a scientific discipline (Bertolini, 2005. This project remains an undetermined one as there is still room for defining its research methods. This article intends to propose a contribution to the discussion of research methodology, in line with the assumptions of Piero Bertolini (1988 phenomenological pedagogy. In particular, starting from the definition of phenomenological pedagogy and education, it aims to answer the question: what are the research strategies through which to build a viable and rigorous educational knowledge, able to grasp the personal transformation and development in a context of inter-subjectivity? Accordingly, I shall discuss data collection and analysis strategies.

  9. Piero Gobetti and the Politics of Liberal Revolution

    OpenAIRE

    Martin, James

    2008-01-01

    Piero Gobetti was an astonishing figure. A radical liberal and fierce critic of Italian politics in the years after World War I, he was fascinated by the workers' struggles in his native Turin and by Gramsci's vision of a factory-based democracy. Gobetti proposed liberalism as an emancipatory theory grounded in social conflicts. "Revolutionary liberalism," as he called it, guided his opposition to Fascism and, following his untimely death at twenty-five, inspired key figures in the Italian Re...

  10. A comparison of Percutaneous femoral access in Endovascular Repair versus Open femoral access (PiERO): study protocol for a randomized controlled trial.

    Science.gov (United States)

    Vierhout, Bastiaan P; Saleem, Ben R; Ott, Alewijn; van Dijl, Jan Maarten; de Kempenaer, Ties D van Andringa; Pierie, Maurice E N; Bottema, Jan T; Zeebregts, Clark J

    2015-09-14

    Access for endovascular repair of abdominal aortic aneurysms (EVAR) is obtained through surgical cutdown or percutaneously. The only devices suitable for percutaneous closure of the 20 French arteriotomies of the common femoral artery (CFA) are the Prostar(™) and Proglide(™) devices (Abbott Vascular). Positive effects of these devices seem to consist of a lower infection rate, and shorter operation time and hospital stay. This conclusion was published in previous reports comparing techniques in patients in two different groups (cohort or randomized). Access techniques were never compared in one and the same patient; this research simplifies comparison because patient characteristics will be similar in both groups. Percutaneous access of the CFA is compared to surgical cutdown in a single patient; in EVAR surgery, access is necessary in both groins in each patient. Randomization is performed on the introduction site of the larger main device of the endoprosthesis. The contralateral device of the endoprosthesis is smaller. When we use this type of randomization, both groups will contain a similar number of main and contralateral devices. Preoperative nose cultures and perineal cultures are obtained, to compare colonization with postoperative wound cultures (in case of a surgical site infection). Furthermore, patient comfort will be considered, using VAS-scores (Visual analog scale). Punch biopsies of the groin will be harvested to retrospectively compare skin of patients who suffered a surgical site infection (SSI) to patients who did not have an SSI. The PiERO trial is a multicenter randomized controlled clinical trial designed to show the consequences of using percutaneous access in EVAR surgery and focuses on the occurrence of surgical site infections. NTR4257 10 November 2013, NL44578.042.13.

  11. tecnología en el estudio PISA 2006

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    José Antonio Acevedo-Díaz

    2007-01-01

    Full Text Available Este artículo describe las principales novedades incorporadas en la evaluación comparativa internacional PISA 2006. Después de analizar el significado de alfabetización científica adoptado, se presta especial atención a la evaluación de actitudes relacionadas con la ciencia y la tecnología, a señalar los aspectos que evalúa esta nueva dimensión y a cómo lo hace el proyecto PISA 2006.

  12. PISA and Global Educational Governance--A Critique of the Project, Its Uses and Implications

    Science.gov (United States)

    Sjøberg, Svein

    2015-01-01

    The PISA project has steadily increased its influence on the educational discourse and educational policies in the now 70 participating countries. The educational debate has become global, and the race to improve PISA-rankings has become high priority in many countries. For governments the PISA-test is a high-stake test. Governments are blamed for…

  13. Influencia del software geogebra en el aprendizaje de programación lineal de los estudiantes del quinto grado de educación secundaria de la Institución Educativa Fe y Alegría Nº 25, San Juan de Lurigancho, 2013

    OpenAIRE

    Gamarra Malpartida, Marco Antonio

    2015-01-01

    El trabajo de investigación tuvo como objetivo determinar la influencia del software geogebra en el aprendizaje de programación lineal en los estudiantes del quinto grado de educación secundaria de la I. E. Fe y Alegría Nº 25, San Juan de Lurigancho, 2013. Las variables identificadas son: El software geogebra (variable independiente) y El aprendizaje de programación lineal (variable dependiente). El tipo de investigación fue experimental; diseño cuasi experimental y un enfoque cuantitativo. L...

  14. Piero Castiglioni - praktilise ilu looja / Karin Paulus

    Index Scriptorium Estoniae

    Paulus, Karin, 1975-

    2005-01-01

    Itaalia disaineritest Castiglioni'dest, pikemalt Piero Castiglionist (sünd. 1944), kes külastas 2005. aasta märtsis Eestit. Loetletud tema tähtsamad tööd. Kommenteerivad sisearhitekt Hannes Praks, sisearhitekt Juta Lember, valgusdisainer Tarmo Luisk ja EKA professor Toivo Raidmets

  15. Implementación de videoclases en YOUTUBE para el fortalecimiento y clarificación de la temática de trabajo y energía en el curso de física de grado décimo del colegio San Luis Gonzaga

    OpenAIRE

    García Cano, Manuel Alberto

    2014-01-01

    El presente trabajo se realizó con el objetivo de implementar las video-clases como una herramienta pedagógica complementaria a los procesos educativos desarrollados en el aula de clase del grado décimo de la institución San Luis Gonzaga de la ciudad de Manizales, así como su impacto en la motivación de la población estudiantil para el abordaje de las temáticas de asignaturas como la física (puntualmente trabajo y energía mecánica). La medición de la motivación se realizó mediante el uso de u...

  16. Il sistema antroponimico a Pisa tra XI e XIII secolo The anthroponymic system in Pisa,11th-13th century

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    Enrica Salvatori

    2001-12-01

    Full Text Available

    Ipertesto dedicato al sistema antroponimico in uso a Pisa nel corso del medioevo centrale. Testi, immagini e grafici sono il risultato della rielaborazione di due articoli dell'autrice usciti sulla rivista “Melanges de l'École Française de Rome" rispettivamente ai numeri 106/2 (1994 e  107/2 (1995.

    Hypertext dedicated to the anthroponymic system in use in Pisa during the High Middle Ages. Text, images and graphics come from the revision, made by the author, of two essays published in  "Melanges de l'Ecole Française de Rome", respectively 106/2 (1994 and 107/2 (1995.

  17. EL DEBATE EN TORNO A LAS ENCUESTAS PISA EN FRANCIA THE DEBATE CONCERNING THE PISA SURVEYS IN FRANCE

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    Eguzki Urteaga

    2010-02-01

    Full Text Available El programa internacional para el seguimiento de los conocimientos de los alumnos, conocido como PISA (Programme for International Student Assessment, no goza de una buena reputación en Francia. Publicadas cada tres años, sus evaluaciones de los sistemas educativos de los treinta países de la OCDE, y actualmente de otros cincuenta países, son de una calidad metodológica reconocida y resisten a la mayoría de las objeciones que le son dirigidas. No en vano, siguen siendo ampliamente ignoradas en Francia donde se intenta descalificarlas a menudo. La reticencia gala hacia esta encuesta resulta de la clasificación mediana para no decir mediocre en la que sitúa al Hexágono en los tres ámbitos evaluados por PISA: comprensión de lo escrito, matemáticas y cultura científica. Si el nivel educativo sube, las diferencias entre alumnos se incrementan. The international program for the follow-up of the knowledge of the pupils, known as PISA (Programme for International Student Assessment, does not enjoy the French observer. Published every three years, his evaluations of the educational systems of thirty countries of the OECD, and nowadays of other fifty countries, have a methodological recognized quality and resist to the majority of the objections that are directed for him. Not uselessly, they continue being widely ignored in France where they try to discredit them very often. The French reticence towards this research come from medium or including mediocre classification in which places the Hexagon in the three areas evaluated by PISA: comprehension of writing, mathematics and scientific culture. If the educational level rises, the differences between pupils increase.

  18. DECISIONES ESTRATÉGICAS DE LECTURA Y RENDIMIENTO EN TAREAS DE COMPETENCIA LECTORA SIMILARES A PISA

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    María-Ángeles Serrano Mendizábal

    2017-01-01

    Full Text Available El rendimiento dispar encontrado en algunos pa ses del informe PISA 2009 (OECD, 2010 entre textos continuos y no-continuos en tareas de competencia lectora, as como la naturaleza y estructura diferente de la informaci n textual, han motivado el estudio del procesamiento on-line de ambos tipos de texto con el objetivo de explorar qu sucede cuando se usan para responder preguntas. El objetivo de este estudio fue analizar las decisiones estrat gicas de relectura de textos continuos y no-continuos en tareas de competencia lectora similares a las de PISA, as como la estabilidad en el uso de esta estrategia. Para ello, se aplicaron dos pruebas estandarizadas de competencia lectora a 112 alumnos de 6. de Primaria y 1. y 2. de ESO, una que inclu a dos textos continuos y otra con cinco textos, tres continuos y dos no-continuos. Los estudiantes leyeron los textos y contestaron las preguntas con el software Read&Answer (Vidal-Abarca, Mart nez, Salmer n, Cerd n y otros, 2011, que permite registrar la conducta on-line adem s del rendimiento. Las puntuaciones en los textos no-continuos resultaron m s bajas que en los continuos, a pesar del mayor n mero de re - lecturas de estos antes de responder. Asimismo, los estudiantes mostraron un grado de estabilidad en sus decisiones estrat gicas de relectura en ambos tipos de texto. El menor rendimiento en textos no-continuos sumado al n mero superior de relecturas para responder preguntas sobre estos, podr a estar indi - cando una menor competencia de nuestros estudiantes en el uso de estrategias relacionadas con la interpretaci n de informaci n no-continua en comparaci n con la mostrada para procesar textos continuos. Los resultados revelan la im - portancia de ense ar de manera expl cita procedimientos espec cos para la comprensi n de textos no-continuos a trav s de las diversas materias.

  19. PISA as a Political Tool in Spain: Assessment Instrument, Academic Discourse and Political Reform

    Science.gov (United States)

    Vega Gil, Leoncio; Hernández Beltrán, Juan Carlos; García Redondo, Eva

    2016-01-01

    This study examines to what extent there is a sort of "political appropiation" by political parties when they seek to set a discourse about the Spanish PISA outcomes. We have consistently found that programs for assessing the competencies of students, especially PISA, have become tools of rationalization and the legitimization of…

  20. A review on research activities using the SANS spectrometer in transmission geometry at ET-RR-1 reactor

    International Nuclear Information System (INIS)

    Adib, M.

    1999-01-01

    The phased double rotor facility operating at ET-RR-1 reactor (2MW) was rearranged to operate as SANS spectrometer in transmission geometry. The rotors are suspended in magnetic fields and are spinning up to 16,000 rpm producing bursts of polyenergetic neutrons with wavelengths from 0.2 nm to 6.5 nm and beam divergence of 17' on the sample. The review on research activities using the SANS spectrometer and its applications for powder particle size determination and the long wavelength fluctuation of magnetization of the Fe-Ni alloys are discussed. (author)

  1. Uma re-análise dos resultados do PISA: problemas de comparabilidade Un reanálisis de los resultados del PISA: Problemas de comparabilidad A re-analysis of PISA results: comparability problems

    Directory of Open Access Journals (Sweden)

    Ruben Klein

    2011-12-01

    Full Text Available Neste artigo apresenta-se um problema de comparabilidade de resultados entre aplicações do Pisa, em alguns países, em diversos anos e entre países. Esse problema ocorre porque a idade escolar de cada país não é considerada e porque não há uma regra para a data de aplicação da prova em relação aos anos letivos de cada país. A mudança de data da aplicação em um país modifica a composição do alunado entre as séries, tornando os universos não comparáveis. Analisa-se com detalhes o caso do Brasil e mostra-se que os universos de 2000 e 2009 não são comparáveis. Analisa-se também alguns outros países, entre eles Luxemburgo e Chile, que, juntos com o Brasil, foram destacados como tendo a maior evolução de desempenho desde 2000. Em Luxemburgo, não houve melhoria de desempenho de 2003 para 2009 e é preciso investigar porque os resultados de 2000 e 2003 são tão diferentes. O Chile apresenta melhoria de desempenho, mas provavelmente não tão grande quanto o apontado.En este artículo se presenta un problema de comparabilidad de resultados entre las aplicaciones del PISA en algunos países, en diversos años y entre los países. Ese problema ocurre porque no se considera la edad escolar de cada uno de los países ni tampoco existe una regla para la fecha de aplicación de la prueba con relación a los años lectivos de cada país. El cambio de fecha de la aplicación en un determinado país modifica la composición del alumnado entre los grados, tornando los universos incomparables. Se analiza con detalles el caso de Brasil y se muestra que los universos de 2000 y 2009 no se pueden comparar. Se analiza también algunos otros países, entre ellos Luxemburgo y Chile, que, juntos con Brasil, se destacaron por tener la mayor evolución de desempeño desde 2000. En Luxemburgo no hubo mejora de desempeño de 2003 para 2009 y es necesario investigar porque los resultados de 2000 y 2003 son tan distintos. Chile presenta mejora de

  2. PISA 2009 Technical Report

    Science.gov (United States)

    OECD Publishing (NJ1), 2012

    2012-01-01

    The "PISA 2009 Technical Report" describes the methodology underlying the PISA 2009 survey. It examines additional features related to the implementation of the project at a level of detail that allows researchers to understand and replicate its analyses. The reader will find a wealth of information on the test and sample design,…

  3. PISA 2012 Technical Report

    Science.gov (United States)

    OECD Publishing, 2014

    2014-01-01

    The "PISA 2012 Technical Report" describes the methodology underlying the PISA 2012 survey, which tested 15-year-olds' competencies in mathematics, reading and science and, in some countries, problem solving and financial literacy. It examines the design and implementation of the project at a level of detail that allows researchers to…

  4. Comentarios a una tesis de grado

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    Camilo Gutiérrez

    1938-06-01

    Full Text Available Por una casualidad llegó a mis manos la tesis que para optar el título de doctor en Medicina y Cirugía presentó al correspondiente Jurado Calificador el señor Aquilino Gaitán Mariño, con el nombre de "Crítica a la campaña antileprosa en Colombia", pero que más propiamente debiera llevar el de "Crítica a la organización de los lazaretos colombianos, en particular el de Agua de Dios", pues el panfleto se reduce a censurar varios aspectos de nuestras leproserías, que constituyen apenas un cortísimo capítulo de la gran obra de la lucha antileprosa en Colombia; y como el doctor Gaitán ejerció seis meses en Agua. de Dios, enfila sus baterías contra este leprosorioquizá el único conocido por él.

  5. Understanding PISA

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    Stephen DOWNES

    2005-04-01

    Full Text Available Understanding PISA Stephen DOWNESMoncton, CANADA ABSTRACT The headline was dramatic enough to cause a ripple in the reading public. "Students who use computers a lot at school have worse maths and reading performance," noted the BBC news article, citing a 2004 study by Ludger Woessmann and Thomas Fuchs (Fuchs and Woessman, 2004. It was not long before the blogosphere took notice. Taking the theme and running with it, Alice and Bill ask, "Computers Make School Kids Dumber?" They theorize, "If you track the admitted decline of education, you'll probably notice that it follows along with the increase of technology in the classroom." In a similar vein, James Bartholomew asks, "Do you think that the government will turn down the volume of its boasting about how it has spent billions introducing computers in schools (while keeping down the pay of teachers so much that there are shortages? Do you think it will stop sending governors of state schools glossy pamphlets about insisting that computers are used in their schools as much as possible?" In this study, therefore, PISA looks well beyond educational attainment, and also includes school demographics, such as whether it is a public or private school, has large or small classes, or has access or not to technological resources. Finally, it does measure student information-their family background, access to books and computers and parental support as well. The PISA survey departs from previous surveys in disregarding the stated curricula of the schools being measured. Therefore, the conclusion is not surprising, nor even wrong for him to consider independently of any parental or teacher support, considered without reference to the software running on it, considered without reference to student attitudes and interests, does not positively impact an education. Finally, he focus on missing the reporting of results

  6. SANS facility at the Pitesti 14 MW Triga reactor

    International Nuclear Information System (INIS)

    Ionita, I.; Anghel, E.; Mincu, M.; Datcu, A.; Grabcev, B.; Todireanu, S.; Constantin, F.; Shvetsov, V.; Popescu, G.

    2006-01-01

    Full text of publication follows: At the present time, an important not yet fully exploited potentiality is represented by the SANS instruments existent at lower power reactors and reactors in developing countries even if they are, generally, endowed with a simpler equipment and are characterized by the lack of infrastructure to maintain and repair high technology accessories. The application of SANS at lower power reactors and in developing countries nevertheless is possible in well selected topics where only a restricted Q range is required, when scattering power is expected to be sufficiently high or when the sample size can be increased at the expense of resolution. Examples of this type of applications are: 1) Phase separation and precipitates in material science, 2) Ultrafine grained materials (nano-crystals, ceramics), 3) Porous materials such as concretes and filter materials, 4) Conformation and entanglements of polymer-chains, 5) Aggregates of micelles in microemulsions, gels and colloids, 6) Radiation damage in steels and alloys. The need for the installation of a new SANS facility at the Triga Reactor of the Institute of Nuclear Researches in Pitesti, Romania become actual especially after the shutting down of the VVRS Reactor from Bucharest. A monochromatic neutron beam with 1.5 Angstrom ≤ λ ≤ 5 Angstrom is produced by a mechanical velocity selector with helical slots.The distance between sample and detectors plane is (5.2 m ). The sample width may be fixed between 10 mm and 20 mm. The minimum value of the scattering vector is Q min = 0.005 Angstrom -1 while the maximal value is Q max = 0.5 Angstrom -1 . The relative error is ΔQ/Q min = 0.5. The cooperation partnership between advanced research centers and the smaller ones from developing countries could be fruitful. The formers act as mentors in solving specific problems. Such a partnership was established between INR Pitesti, Romania and JINR Dubna, Russia. The first step in this cooperation

  7. Iconic Destination: a Snapshot of Sustainable Tourism in Pisa

    Directory of Open Access Journals (Sweden)

    Silvia Sarti

    2015-12-01

    Full Text Available Tourism is one of the world's fastest growing industries. According to the World Tourism Organization, Italy is the fifth most visited country in the world, with more than 47.7 million tourists a year (2013. At the same time, the increasing number of studies focused on sustainable tourism demonstrates a growing interest about the topic. In addition, practitioners’ attitude is changing and the most important actors of the market are acting in a more sustainable way and developing reports on their eco-friendly performances. Nowadays, the entire supply chain maybe environmentally sustainable. From the reservation to the post-holiday phase, it is possible to select the more eco-friendly suppliers. The main companies operating in the different stages of the process are demonstrating a concrete interest on sustainable development. This new challenge is generated through the information flow between local authorities, private firms and final customers. We propose to make a reflection based on the latter actors’ attitude. Our research aims to investigate the level of sensitivity of tourists about environmental sustainability from two different perspectives: self-evaluation and real purchasing behavior. We conducted a face-to-face survey among tourists in Pisa, in Piazza dei Miracoli, during May 2015. By using a structured questionnaire, we gathered primary data from a sample of 406 respondents. We selected respondents randomly. Pisa is the perfect location to obtain information from several typologies of tourists, with different levels of awareness of sustainable issues. Itis one of the most important tourist destination in Italy and it is an iconic destination recognized worldwide thanks to the attractiveness of the leading tower. The results of our study is a snapshot of the current level of awareness among tourists. The analysis of the questionnaires revealed tourist profiles, their eco-friendly behaviors, their concerns about sustainability

  8. PISA Problems

    Science.gov (United States)

    Tienken, Christopher

    2014-01-01

    Pundits and bureaucrats use the results from international tests, particularly the PISA, to make claims about the quality of the public education system in the United States and make policy recommendations. In this article I argue, with evidence, that the scores and rankings from PISA are not important and that they cannot give policy makers or…

  9. Two Critics of Marginalist Theory: Piero Sraffa and John Maynard Keynes

    OpenAIRE

    Kurz, Heinz D.

    2012-01-01

    The paper discusses the contributions of two major critics of marginalist theory: John Maynard Keynes and Piero Sraffa. While Keynes and his followers directed their attention and energy first and foremost to a criticism of Say's law, Sraffa and his followers did so with respect to marginal productivity theory. However, as the paper shows, Sraffa's criticism implies also a rejection of Say's law. The main focus of the paper is the route by means of which Sraffa arrived at his analysis and to ...

  10. Tracing the French Policy PISA Debate: A Policy Configuration Approach

    Science.gov (United States)

    Pons, Xavier

    2016-01-01

    This article traces the evolution of the French policy PISA debate from 2001 to 2014 by analysing the results of two original qualitative researches. Theoretically, this debate is the outcome of specific policy configurations, which predetermine its scope, content and effectiveness. These configurations are themselves described through their…

  11. Comparison of SANS instruments at reactors and pulsed sources

    International Nuclear Information System (INIS)

    Thiyagarajan, P.; Epperson, J.E.; Crawford, R.K.; Carpenter, J.M.; Hjelm, R.P. Jr.

    1992-01-01

    Small angle neutron scattering is a general purpose technique to study long range fluctuations and hence has been applied in almost every field of science for material characterization. SANS instruments can be built at steady state reactors and at the pulsed neutron sources where time-of-flight (TOF) techniques are used. The steady state instruments usually give data over small q ranges and in order to cover a large q range these instruments have to be reconfigured several times and SANS measurements have to be made. These instruments have provided better resolution and higher data rates within their restricted q ranges until now, but the TOF instruments are now developing to comparable performance. The TOF-SANS instruments, by using a wide band of wavelengths, can cover a wide dynamic q range in a single measurement. This is a big advantage for studying systems that are changing and those which cannot be exactly reproduced. This paper compares the design concepts and performances of these two types of instruments

  12. Explaining Italian Underdevelopment. The Liberal Revolution of Piero Gobetti

    Directory of Open Access Journals (Sweden)

    Gonzalo Varela Petito

    2010-07-01

    Full Text Available This article presents to the readers in Latin America the thought of the Italian liberal writer and politician Piero Gobetti (Torino 1900–Paris 1926 who was a close friend of Antonio Gramsci and one of the main intellectual influences on the work of the marxist peruvian thinker José Carlos Mariátegui. His most relevant book, La Rivoluzione Libérale, was translated into Spanish only recently but —as Mariátegui understood— some of Gobetti's ideas are very relevant to an analysis of Latin American socialformations. His very original "movement oriented" liberalism was influenced by the Russian revolution as well as by philosophers like Georges Sorel, Gaetano Mosca, Benedetto Croce and Henri Bergson.Gobetti's major concern in politics was to promote the emergence of a new ruling class. For a better comprehension of his thought, Gobetti's ideas are here compared with those of Gramsci and Mariátegui.

  13. Grado de adherencia a tratamientos en personas con riesgo cardiovascular

    Directory of Open Access Journals (Sweden)

    Stella Ignacia Ortega Oviedo

    2014-01-01

    Full Text Available Objetivo: Determinar el grado de adherencia al tratamiento farmacológico y no farmacológico en personas con factores de riesgo cardiovascular inscritos en el programa de promoción de la salud y prevención de la enfermedad cardiovascular en una Institución Prestadora de Salud de Montería, Colombia. Metodología: Estudio descriptivo, transversal, cuantitativo, con 204 pacientes de un programa de promoción de la salud y prevención de la enfermedad cardiovascular. La información se obtuvo aplicando la cuarta versión del Instrumento para evaluar los factores que influyen en la adherencia a tratamientos farmacológicos y no farmacológicos en pacientes con factores de riesgo de enfermedad cardiovascular, diseñado por Bonilla y Gutiérrez (3. Los resultados se analizaron mediante técnicas de estadística descriptiva y medidas de tendencia central y de posición. Resultados: El grado de adherencia terapéutica en los participantes mostró un 67% en situación de ventaja para adherencia; un 29% en riesgo a no adherirse y un 4% en situación de no adherencia. Los tres grupos de situación de adherencia identificados varían estadísticamente con relación a las cuatro dimensiones estudiadas, siendo la Dimensión II relacionada con el proveedor la que aportó mayor diferencia. Conclusiones: Estos hallazgos permiten destacar la importancia de la relación paciente-proveedor en el grado de adherencia de los pacientes, haciendo necesario que la institución y el equipo de salud y enfermería enfaticen las acciones de autocuidado con apoyo, acompañamiento permanente y orientación acorde a sus necesidades, a sus expectativas y a las características individuales de las personas atendidas.

  14. Revisiting the Relationship between International Assessment Outcomes and Educational Production: Evidence From a Longitudinal PISA-TIMSS Sample

    Science.gov (United States)

    Carnoy, Martin; Khavenson, Tatiana; Loyalka, Prashant; Schmidt, William H.; Zakharov, Andrey

    2016-01-01

    International assessments, such as the Program for International Student Assessment (PISA), are being used to recommend educational policies to improve student achievement. This study shows that the cross-sectional estimates behind such recommendations may be biased. We use a unique data set from one country that applied the PISA mathematics test…

  15. Errare Humanum Est! A Socio-Psychological Approach to a "Climbing Mount Fuji" PISA Question

    Science.gov (United States)

    Selleri, Patrizia; Carugati, Felice

    2018-01-01

    There is a consensus that the items proposed by the Program for International Student Assessment (PISA) program allow us to focus on the outcomes of the processes of appropriation and transformation of learning tools at the end of compulsory schooling, particularly regarding the key competencies for lifelong learning and citizenship in digital…

  16. Gas-cooled reactor coolant circulator and blower technology. Proceedings of a specialists meeting held in San Diego 30 November - 2 December 1987

    Energy Technology Data Exchange (ETDEWEB)

    1988-08-01

    In the previous 17 meetings held within the framework of the International Working Group on Gas-Cooled Reactors, a wide variety of topics and components have been addressed, but the San Diego meeting represented the first time that a group of specialists had been convened to discuss circulator and blower related technology. A total of 20 specialists from 6 countries attended the meeting in which 15 technical papers were presented in 5 sessions: circulator operating experience I and II (6 papers); circulator design considerations I and II (6 papers); bearing technology (3 papers). A separate abstract was prepared for each of these papers. Refs, figs and tabs.

  17. Knowledge and Skills for PISA

    DEFF Research Database (Denmark)

    Dohn, Nina Bonderup

    2007-01-01

    to the claims of PISA, PISA is not an assessment of the ‘knowledge and skills for life' of students, but only of ‘knowledge and skills in assessment situations'. Even this latter form of assessment is not fully reliable, however, because of problems at the level of concrete test items and because of an inherent......This article gives a critique of the methodology of OECD's Programme for International Student Assessment (PISA). It is argued that PISA is invalidated by the fact that the methodology chosen does not constitute an adequate operationalisation of the question of inquiry. Therefore, contrary...

  18. Nivel de consumo diario de frutas y verduras en escolares con sobrepeso y obesidad del primer y segundo grado de primaria de la Institución Educativa Particular San Andrés. Lima. Mayo 2011

    OpenAIRE

    Alfaro, katherine

    2013-01-01

    Objetivos: Determinar el nivel de consumo diario de frutas y verduras en escolares con sobrepeso y obesidad de primer y segundo grado de nivel primario de la IEP San Andrés. Diseño: Estudio descriptivo, transversal, observacional y prospectivo. Institución: Institución Educativa Particular San Andrés. Participantes: Veintisiete escolares con sobrepeso y 33 con obesidad, de primer y segundo grado de nivel primaria. Intervenciones: Aplicación de formato de frecuencia de consumo de frutas y verd...

  19. A Comparative Analysis of PISA Scientific Literacy Framework in Finnish and Thai Science Curricula

    Science.gov (United States)

    Sothayapetch, Pavinee; Lavonen, Jari; Juuti, Kalle

    2013-01-01

    A curriculum is a master plan that regulates teaching and learning. This paper compares Finnish and Thai primary school level science curricula to the PISA 2006 Scientific Literacy Framework. Curriculum comparison was made following the procedure of deductive content analysis. In the analysis, there were four main categories adopted from PISA…

  20. Using TIMSS and PISA Results to Inform Educational Policy: A Study of Russia and Its Neighbours

    Science.gov (United States)

    Carnoy, Martin; Khavenson, Tatiana; Ivanova, Alina

    2015-01-01

    In this paper, we develop a multi-level comparative approach to analyse Trends in International Mathematics and Science Survey (TIMSS) and Programme of International Student Achievement (PISA) mathematics results for a country, Russia, where the two tests provide contradictory information about students' relative performance. Russian students do…

  1. ACG 97/4a: Modificaci??n del Grado en Logopedia

    OpenAIRE

    Universidad de Granada

    2015-01-01

    Modificaci??n de los criterios de matriculaci??n de la asignatura ???Pr??cticas Externas??? de los Grados en Logopedia y Psicolog??a: Modificaci??n del Grado en Logopedia. Aprobado en la sesi??n ordinaria de Consejo de Gobierno de 28 de julio de 2015.

  2. Validating the Interpretations of PISA and TIMSS Tasks: A Rating Study

    Science.gov (United States)

    Rindermann, Heiner; Baumeister, Antonia E. E.

    2015-01-01

    Scholastic tests regard cognitive abilities to be domain-specific competences. However, high correlations between competences indicate either high task similarity or a dependence on common factors. The present rating study examined the validity of 12 Programme for International Student Assessment (PISA) and Third or Trends in International…

  3. The Role of Content and Context in PISA Interest Scales: A study of the embedded interest items in the PISA 2006 science assessment

    Science.gov (United States)

    Drechsel, Barbara; Carstensen, Claus; Prenzel, Manfred

    2011-01-01

    This paper focuses interest in science as one of the attitudinal aspects of scientific literacy. Large-scale data from the Programme for International Student Assessment (PISA) 2006 are analysed in order to describe student interest more precisely. So far the analyses have provided a general indicator of interest, aggregated over all contexts and contents in the science test. With its innovative approach PISA embeds interest items within the cognitive test unit and its contents and contexts. The main difference from conventional interest measures is that in most questionnaires, a relatively small number of interest items cover broad fields of contents and contexts. The science units represent a number of systematically differentiated scientific contexts and contents. The units' stimulus texts allow for concrete descriptions of relevant content aspects, applications, and contexts. In the analyses, multidimensional item response models are applied in order to disentangle student interest. The results indicate that multidimensional models fit the data. A two-dimensional model separating interest into two different knowledge of science dimensions described in the PISA science framework is further analysed with respect to gender, performance differences, and country. The findings give a comprehensive description of students' interest in science. The paper deals with methodological problems and describes requirements of the test construction for further assessments. The results are discussed with regard to their significance for science education.

  4. Autoestima y agresividad en estudiantes de quinto grado de educación primaria de la institución educativa estatal "Pedro Adolfo Labarthe", distrito La Victoria, UGEL 03 San Miguel 2015.

    OpenAIRE

    Pariona Martínez, Magaly

    2015-01-01

    Este estudio responde al objeto determinar si existe relación significativa de la autoestima con la agresividad en estudiantes de quinto grado de educación primaria de la Institución Educativa estatal “Pedro Adolfo Labarthe”, distrito la Victoria, UGEL 03 San Miguel, 2015. El interés de la presente investigación es establecer la relación entre los factores emocionales – particularmente la autoestima- y la agresividad en estudiantes de quinto grado de educación primaria, describir cómo ha sido...

  5. Kosovo’s Low Performance in PISA 2015: An Explanation From a Socioeconomic Perspective

    Directory of Open Access Journals (Sweden)

    Arif Shala

    2018-02-01

    Full Text Available This paper will analyze the performance of Kosovar students in PISA 2015 and explain the low performance from a socioeconomic standpoint. On its first participation in this assessment, Kosovo was ranked among the three lowest achieving countries. It is the argument of this paper that parental education and home possessions, both measures of socioeconomic status, determined the performance of students in Kosovo. There is compelling evidence that links student achievement and socioeconomic factors, a link that is well established in research. PISA is the first study to link student achievement in international assessments and socioeconomic factors in Kosovo and this paper is the first one research this link in the case of Kosovo. According to the PISA results, the higher the education levels of the primary caregiver, the higher the achievement of the student. In terms of home possessions, the higher the numbers of resources (Internet, computers etc. the higher the student achievement in mathematics, reading and science. In light of this evidence, any policy that fails to account for the impact of familial socioeconomic status will not improve the education quality in Kosovo.

  6. Working group on VVER safety analysis - report of the 2010 meeting

    International Nuclear Information System (INIS)

    Kliem, S.

    2010-01-01

    The AER Working Group D on WWER reactor safety analysis held its nineteenth meeting in Pisa, Italy, during the period 15-16 April, 2010. The meeting was hosted by the San Piero a Grado Nuclear Research Group of the University of Pisa and was held in conjunction with the second workshop on the OECD/NEA Benchmark for the Kalinin-3 WWER-1000 NPP and the fourth workshop on the OECD Benchmark for Uncertainty Analysis in Best-Estimate Modelling (UAM) for Design, Operation and Safety Analysis of LWRs. Altogether 12 participants attended the meeting of the working group D, 8 from AER member organizations and 4 guests from non-member organization. The co-ordinator of the working group, Mr. S. Kliem, served as chairman of the meeting. The meeting started with a general information exchange about the recent activities in the participating organizations. The given presentations and the discussions can be attributed to the following topics:-Code validation and benchmarking including the calculation of the OECD/NEA Benchmark for the Kalinin-3 WWER-1000 NPP;-Safety analyses and code developments;-Future activities A list of the participants and a list of the handouts distributed at the meeting are attached to the report. The corresponding PDF-files can be obtained from the chairman. (Author)

  7. PISA for Development and the Sustainable Development Goals. PISA for Development Brief 17

    Science.gov (United States)

    OECD Publishing, 2017

    2017-01-01

    The PISA for Development brief series is a set of concise monthly education policy-oriented notes published by the OECD which are designed to describe a specific PISA for Development topic. In this brief, PISA's role in monitoring the fourth United Nations Sustainable Development Goal--to "ensure inclusive and equitable quality education and…

  8. Program for International Student Assessment (PISA) 2006 and Scientific Literacy: A Perspective for Science Education Leaders

    Science.gov (United States)

    Bybee, Rodger W.

    2009-01-01

    This article describes the idea of scientific literacy as defined in PISA, discusses relevant results of PISA, and clarifies meaningful relationships between PISA data and scientific competencies of U.S. students. Finally, the author includes insights and recommendations for contemporary leadership in science education. (Contains 8 tables and 1…

  9. PROFESSORES DO PISA: A ESPERANÇA E A REALIZAÇÃO DA EDUCAÇÃO

    Directory of Open Access Journals (Sweden)

    Daniel Pettersson

    Full Text Available RESUMO: As atividades do Programme for International Student Assessment (PISA e os seus efeitos são diversos, sendo possível dizer que o PISA cria e forma uma fundamentação específica (HACKING, 1992 para discutir, falar e pensar sobre a educação. Neste estudo sobre as atividades do PISA, são analisadas as ideias sobre os professores, as atividades que realizam, e como estas são conceitualizadas no interior de uma narrativa própria ao PISA. Os resultados mostram que os professores são apresentados como sendo importantes e cruciais para a transformação e para o desenvolvimento da educação. Os professores também são representados como sendo essenciais para reduzir as "disparidades no desempenho" dos alunos medidas pelo teste PISA. Ademais, os "bons" professores e o ensino "eficaz" são descritos como os professores e as estratégias que conduzem a tal redução. Consequentemente, os principais relatórios do PISA enfatizam uma imagem dos professores como os atores que desenvolvem a educação e o ensino, e não como executantes de políticas determinadas pelo Estado. Deste modo, os professores são considerados como indicadores da eficácia dos sistemas de educação e importantes para elevar os padrões de desempenho, sendo assim considerados como a esperança e a realização da educação.

  10. Comunicación asertiva en la construcción del pensamiento crítico. Experiencia con estudiantes de grado sexto en San Antonio Norte

    OpenAIRE

    Rivera Sanabria, Margoth

    2017-01-01

    Este proyecto está inscrito en la línea de investigación en Didácticas de las Ciencias Sociales, así mismo en el macro proyecto de pensamiento Social-crítico para la comprensión, interpretación y transformación del conocimiento escolar en contextos socio-culturales e históricos. Los derroteros de este proyecto fueron potenciar las habilidades para la vida que les permitan fortalecer las destrezas psicosociales necesarias a los jóvenes del grado sexto para la construcción de procesos personale...

  11. Geologic Investigation of a Potential Site for a Next-Generation Reactor Neutrino Oscillation Experiment -- Diablo Canyon, San Luis Obispo County, CA

    International Nuclear Information System (INIS)

    Onishi, Celia Tiemi; Dobson, Patrick; Nakagawa, Seiji; Glaser, Steven; Galic, Dom

    2004-01-01

    This report provides information on the geology and selected physical and mechanical properties of surface rocks collected at Diablo Canyon, San Luis Obispo County, California as part of the design and engineering studies towards a future reactor neutrino oscillation experiment. The main objective of this neutrino project is to study the process of neutrino flavor transformation or neutrino oscillation by measuring neutrinos produced in the fission reactions of a nuclear power plant. Diablo Canyon was selected as a candidate site because it allows the detectors to be situated underground in a tunnel close to the source of neutrinos (i.e., at a distance of several hundred meters from the nuclear power plant) while having suitable topography for shielding against cosmic rays. The detectors have to be located underground to minimize the cosmic ray-related background noise that can mimic the signal of reactor neutrino interactions in the detector. Three Pliocene-Miocene marine sedimentary units dominate the geology of Diablo Canyon: the Pismo Formation, the Monterey Formation, and the Obispo Formation. The area is tectonically active, located east of the active Hosgri Fault and in the southern limb of the northwest trending Pismo Syncline. Most of the potential tunnel for the neutrino detector lies within the Obispo Formation. Review of previous geologic studies, observations from a field visit, and selected physical and mechanical properties of rock samples collected from the site provided baseline geological information used in developing a preliminary estimate for tunneling construction cost. Gamma-ray spectrometric results indicate low levels of radioactivity for uranium, thorium, and potassium. Grain density, bulk density, and porosity values for these rock samples range from 2.37 to 2.86 g/cc, 1.41 to 2.57 g/cc, and 1.94 to 68.5 percent respectively. Point load, unconfined compressive strength, and ultrasonic velocity tests were conducted to determine rock

  12. Geologic Investigation of a Potential Site for a Next-Generation Reactor Neutrino Oscillation Experiment -- Diablo Canyon, San Luis Obispo County, CA

    International Nuclear Information System (INIS)

    Onishi, Celia Tiemi; Dobson, Patrick; Nakagawa, Seiji; Glaser, Steven; Galic, Dom

    2004-01-01

    This report provides information on the geology and selected physical and mechanical properties of surface rocks collected at Diablo Canyon, San Luis Obispo County, California as part of the design and engineering studies towards a future reactor neutrino oscillation experiment. The main objective of this neutrino project is to study the process of neutrino flavor transformation--or neutrino oscillation--by measuring neutrinos produced in the fission reactions of a nuclear power plant. Diablo Canyon was selected as a candidate site because it allows the detectors to be situated underground in a tunnel close to the source of neutrinos (i.e., at a distance of several hundred meters from the nuclear power plant) while having suitable topography for shielding against cosmic rays. The detectors have to be located underground to minimize the cosmic ray-related background noise that can mimic the signal of reactor neutrino interactions in the detector. Three Pliocene-Miocene marine sedimentary units dominate the geology of Diablo Canyon: the Pismo Formation, the Monterey Formation, and the Obispo Formation. The area is tectonically active, located east of the active Hosgri Fault and in the southern limb of the northwest trending Pismo Syncline. Most of the potential tunnel for the neutrino detector lies within the Obispo Formation. Review of previous geologic studies, observations from a field visit, and selected physical and mechanical properties of rock samples collected from the site provided baseline geological information used in developing a preliminary estimate for tunneling construction cost. Gamma-ray spectrometric results indicate low levels of radioactivity for uranium, thorium, and potassium. Grain density, bulk density, and porosity values for these rock samples range from 2.37 to 2.86 g/cc, 1.41 to 2.57 g/cc, and 1.94 to 68.5% respectively. Point load, unconfined compressive strength, and ultrasonic velocity tests were conducted to determine rock mechanical

  13. Práctica 3: Precipitación, Filtración y Centrifugación (Video 3 de 4) - Grado en Química, Grado en Enología y Grado en Biotecnología

    OpenAIRE

    Palacios Santander, José María; Cubillana Aguilera, Laura; Fernández Barbero, Gerardo; Espada Bellido, Estrella; García Moreno, María de Valme

    2015-01-01

    Práctica 3: Precipitación, Filtración y Centrifugación (Video 3 de 4) - Grado en Química, Grado en Enología y Grado en Biotecnología. Este vídeo se inicia con la preparación de la muestra para su posterior centrifugación y concluye con la separación del precipitado del sobrenadante.

  14. IV Jornada de Estudiantes del Grado en Ciencia y Tecnología de los Alimentos

    OpenAIRE

    Morante, Sonia; Pérez, Damián; Sierra, Isabel

    2014-01-01

    Comunicaciones y actividades realizadas en la IV Jornada de Estudiantes del Grado en Ciencia y Tecnología de los Alimentos en la Universidad Rey Juan Carlos, Escuela Superior de Ciencias Experimentales y Tecnología, Campus de Móstoles

  15. A Comparison of PISA and TIMSS 2003 Achievement Results in Mathematics

    Science.gov (United States)

    Wu, Margaret

    2009-01-01

    This study compares the Programme for International Student Assessment (PISA) 2003 Mathematics results with the Trends in International Mathematics and Science Study (TIMSS) 2003 Grade 8 mathematics results, using country mean scores for 22 participants of both studies. It is found that Western countries generally performed better in PISA than in…

  16. El impacto de PISA en España: la influencia de los medios de comunicación

    OpenAIRE

    Fernández-Aliseda Garrido, Mar

    2016-01-01

    El informe PISA ha conseguido agitar profundamente sistemas educativos a nivel internacional. Convertido en la evaluación educativa más popular, incluso fuera de círculos especializados, aporta cada tres años una completísima y compleja base de datos

  17. Uso de las fichas didácticas en v grado de la educación primaria: visión de los educadores en San Ramón

    Directory of Open Access Journals (Sweden)

    Alicia Alfaro Valverde

    2003-01-01

    Full Text Available Este artículo es parte de un proceso de investigación desarrollado en el año 2001 en dos circuitos escolares de la Dirección Regional de Educación de San Ramón. Presenta los resultados obtenidos de los educadores de V grado en relación con el uso de las fichas didácticas en Educación Primaria. La ficha didáctica es una técnica que se propone desde finales del siglo XIX, con el objetivo de individualizar la enseñanza y sigue manteniendo vigencia hasta el día de hoy. Por tal razón nos dimos a la tarea de investigar la concepción que manejan los educadores acerca de las fichas didácticas, las características, tipos, principios y valores que se pueden fortalecer, frecuencia con que se utilizan, razones de su uso, respuesta de los niños, ventajas, desventajas y sugerencias dadas por los educadores. Termina el artículo con algunas conclusiones en relación con la temática abordada

  18. Statistical Techniques Utilized in Analyzing PISA and TIMSS Data in Science Education from 1996 to 2013: A Methodological Review

    Science.gov (United States)

    Liou, Pey-Yan; Hung, Yi-Chen

    2015-01-01

    We conducted a methodological review of articles using the Programme for International Student Assessment (PISA) or Trends in International Mathematics and Science Study (TIMSS) data published by the SSCI-indexed science education journals, such as the "International Journal of Science and Mathematics Education," the "International…

  19. A Comparison of Mother-Tongue Curricula of Successful Countries in PISA and Turkey by Higher-Order Thinking Processes

    Science.gov (United States)

    Cer, Erkan

    2018-01-01

    Purpose: The purpose of the current study is to reveal general qualities of the objectives in the mother-tongue curricula of Hong Kong and Shanghai-China, South Korea, Singapore, and Turkey in terms of higher-order thinking processes specified by PISA tests. Research Methods: In this study, the researcher used a qualitative research design.…

  20. A Critique of PISA and What Jullien's Plan Might Offer

    Science.gov (United States)

    Forestier, Katherine; Adamson, Bob

    2017-01-01

    Adopting a comparative perspective to address educational issues in different contexts was a hallmark of Jullien's work in the early-nineteenth century. Different emphases and approaches to comparative education methodology have emerged in recent times thanks to major developments in technology, but have these changes rendered Jullien's ideas…

  1. PISA: Multiple 'Truths' and Mediatised Global Governance

    Science.gov (United States)

    Grey, Sue; Morris, Paul

    2018-01-01

    The OECD's PISA programme has been portrayed as central to the emergence of a regime of global educational governance and the subsequent convergence of policies towards a standardised model. Whilst there is an extensive literature describing PISA's impact on education policies, there is a paucity of analysis of how PISA data is presented to the…

  2. What can we learn from PISA?: Investigating PISA's approach to scientific literacy

    Science.gov (United States)

    Schwab, Cheryl Jean

    This dissertation is an investigation of the relationship between the multidimensional conception of scientific literacy and its assessment. The Programme for International Student Assessment (PISA), developed under the auspices of the Organization for Economic Cooperation and Development (OECD), offers a unique opportunity to evaluate the assessment of scientific literacy. PISA developed a continuum of performance for scientific literacy across three competencies (i.e., process, content, and situation). Foundational to the interpretation of PISA science assessment is PISA's definition of scientific literacy, which I argue incorporates three themes drawn from history: (a) scientific way of thinking, (b) everyday relevance of science, and (c) scientific literacy for all students. Three coordinated studies were conducted to investigate the validity of PISA science assessment and offer insight into the development of items to assess scientific 2 literacy. Multidimensional models of the internal structure of the PISA 2003 science items were found not to reflect the complex character of PISA's definition of scientific literacy. Although the multidimensional models across the three competencies significantly decreased the G2 statistic from the unidimensional model, high correlations between the dimensions suggest that the dimensions are similar. A cognitive analysis of student verbal responses to PISA science items revealed that students were using competencies of scientific literacy, but the competencies were not elicited by the PISA science items at the depth required by PISA's definition of scientific literacy. Although student responses contained only knowledge of scientific facts and simple scientific concepts, students were using more complex skills to interpret and communicate their responses. Finally the investigation of different scoring approaches and item response models illustrated different ways to interpret student responses to assessment items. These

  3. Findings from the PISA for Development Field Trial of the School-Based Assessment. PISA for Development Brief 16

    Science.gov (United States)

    OECD Publishing, 2017

    2017-01-01

    The PISA for Development (PISA-D) project aims to make PISA more accessible and relevant to middle- and low-income countries by introducing new features to the assessment, including tests that are specially designed to measure lower levels of performance, contextual questionnaires that better reflect the situations of 15-year-olds across a diverse…

  4. Reading literacy as a measure of the quality of education: Estimates based on PISA 2009 data

    Directory of Open Access Journals (Sweden)

    Pavlović-Babić Dragica

    2010-01-01

    Full Text Available The definition of reading literacy in the PISA study, similar to other international studies of reading, emphasizes the importance of reading for active participation in society, thereby promoting the ability of students to critically analyze information and use it for different purposes. The study examined the level of reading literacy in fifteen-year-old students in different countries, whether there was progress compared to previous cycles of testing, the development of the individual literacy components, and the distribution of students by levels of reading literacy. The sample included fifteen-year-old students, regardless of the grade they had attended at the time of testing. The study was conducted in 190 schools, with the total of 5,523 students tested. The data show that the average achievement of students in Serbia in the domain of reading literacy is still below average compared to the achievement of students from OECD countries, but the results were significantly higher when compared to 2006. The most conspicuous change between two cycles of testing occurred at lower achieving levels of reading literacy, which indicates that the dominant way of teaching in schools is through traditional lectures and oriented towards the adoption of academic knowledge. The progress achieved in the average score for reading literacy scale can be seen as a result of greater involvement and greater motivation of students and teachers, the more apparent support of officials in the PISA 2009 study than in 2006 study, as well as a result of substantial changes in general social context in which students were educated. .

  5. Relative Private School Effectiveness in the Netherlands: A Reexamination of PISA 2006 and 2009 data

    OpenAIRE

    Cornelisz, Ilja

    2013-01-01

    An ongoing question is whether private (religious) schools provide better education than public schools. This study re- addresses this issue, using PISA 2006 and 2009 data for the Netherlands and three different methodologies. Overall, there is no consistent pattern. Results based on ordinary least squares and propensity score matching suggest private school attendance is positively associated with mathematics achievement, but only for PISA 2006. Instead, the results generated by an instrumen...

  6. PIERO ontology for analysis of biochemical transformations: effective implementation of reaction information in the IUBMB enzyme list.

    Science.gov (United States)

    Kotera, Masaaki; Nishimura, Yosuke; Nakagawa, Zen-ichi; Muto, Ai; Moriya, Yuki; Okamoto, Shinobu; Kawashima, Shuichi; Katayama, Toshiaki; Tokimatsu, Toshiaki; Kanehisa, Minoru; Goto, Susumu

    2014-12-01

    Genomics is faced with the issue of many partially annotated putative enzyme-encoding genes for which activities have not yet been verified, while metabolomics is faced with the issue of many putative enzyme reactions for which full equations have not been verified. Knowledge of enzymes has been collected by IUBMB, and has been made public as the Enzyme List. To date, however, the terminology of the Enzyme List has not been assessed comprehensively by bioinformatics studies. Instead, most of the bioinformatics studies simply use the identifiers of the enzymes, i.e. the Enzyme Commission (EC) numbers. We investigated the actual usage of terminology throughout the Enzyme List, and demonstrated that the partial characteristics of reactions cannot be retrieved by simply using EC numbers. Thus, we developed a novel ontology, named PIERO, for annotating biochemical transformations as follows. First, the terminology describing enzymatic reactions was retrieved from the Enzyme List, and was grouped into those related to overall reactions and biochemical transformations. Consequently, these terms were mapped onto the actual transformations taken from enzymatic reaction equations. This ontology was linked to Gene Ontology (GO) and EC numbers, allowing the extraction of common partial reaction characteristics from given sets of orthologous genes and the elucidation of possible enzymes from the given transformations. Further future development of the PIERO ontology should enhance the Enzyme List to promote the integration of genomics and metabolomics.

  7. Práctica 3: Precipitación, Filtración y Centrifugación (Video 1 de 4) - Grado en Biotecnología

    OpenAIRE

    Palacios Santander, José María; Cubillana Aguilera, Laura; Fernández Barbero, Gerardo; Espada Bellido, Estrella; García Moreno, María de Valme

    2015-01-01

    Este vídeo forma parte de los ya incluidos anteriormente, pero al tratarse de una práctica de un Grado diferente a los anteriores (Grado en Biotecnología), lo incluimos aparte. En los anteriores, la práctica corresponde a la asignatura Operaciones Básicas de Laboratorio del Grado en Enología y del Grado en Química y éste pertenece a una práctica de la asignatura Laboratorio Integrado de Química del Grado en Biotecnología. Los nombres de las asignaturas se especifican en cada vídeo correspondi...

  8. Historia de España para estudiantes de grado de periodismo: aprendizaje integrado de contenidos y lenguas

    Directory of Open Access Journals (Sweden)

    Cayetano Fernández Romero

    2012-04-01

    Full Text Available En este trabajo, se expone un modelo de actividad AICLE con el objetivo de formar a futuros profesionales de la comunicación no sólo en contenidos sino también en la adquisición de la riqueza cultural y lingüística que aporta conocer lenguas extranjeras. El ejercicio, que está previsto para el Grado de Periodismo de la Universidad San Jorge (Zaragoza en el curso académico 2009-2010, tiene como temática principal la participación extranjera en la Guerra Civil española a partir de documentos de naturaleza periodística extraídos de El País en su versión inglesa. En la primera parte, se justifica la importancia de la utilización de las lenguas extranjeras en la educación superior y a continuación, se presenta los objetivos, fuentes, metodología, desarrollo y evaluación de la práctica.

  9. Behavior to the fracture of an AISI 304 stainless steel sensitized in BWR reactor conditions (288 degrees Centigrade and 80 Kg/cm{sup 2}); Comportamiento a la fractura de un acero inoxidable AISI 304 sensibilizado en condiciones de reactor BWR (288 grados Centigrados y 80 Kg/cm{sup 2})

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez C, R.; Diaz S, A.; Garcia R, R.; Aguilar T, A.; Gachuz M, M.; Arganis J, C.; Merino C, J. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1999-07-01

    It is a knew fact that ductility of a lot of structural alloys can be deteriorated by the environment effect which are exposed, and that their consequent embrittlement can put in doubt the safety of their functioning; such is the case of austenitic stainless steels used in internal components of the BWR type reactors which not only is subjected to the effect combined of the aggressive environment which surround it (pressure, temperature, corrosion potential, conductivity medium, local state of efforts, etc.), but also to the action of present neutron radiation, manifesting microstructural changes which are reflected in the augmentation of its susceptibility to the intergranular cracking, phenomena generally known as IASCC ''Irradiation Assisted Stress Corrosion Cracking''. Once appeared the cracking in the material, the useful life of a component is limited by the rapidity to growth of these cracking, making necessary evaluations which can to predict its behavior, therefore the present work shows the preliminary results for determining the behavior to the fracture of an AISI 304 stainless steel sensitized, in a dynamic recirculation circuit which allows to simulate the operation conditions of a BWR reactor (288 Centigrade and 80 kg/cm{sup 2}). (Author)

  10. Ensino de Física por meio de questões do PISA associadas a Temas Estruturadores e Conceitos Unificadores

    Directory of Open Access Journals (Sweden)

    Wagner Duarte José

    2016-09-01

    Full Text Available http://dx.doi.org/10.5007/2175-7941.2016v33n2p333   Programas de avaliação da educação em escala mundial como o PISA vêm contribuindo para as nações participantes refletirem e efetuarem políticas públicas educativas na escola básica, projetando reflexos na formação inicial e continuada de professores. Por meio de um estudo de caráter exploratório, neste trabalho, verificamos como se articulam os Temas Estruturadores do Ensino de Física e os conceitos unificadores nas unidades temáticas de física das provas de ciências do PISA. Objetivamos destacar a potencialidade dessa articulação para o ensino-aprendizagem segundo a via dos universais da física com aporte das tecnologias digitais de informação e comunicação (TDIC. Concluímos ressaltando a importância do PISA no contexto atual de avaliação da educação, bem como, a pertinência da articulação em pauta e, consequentemente, as mudanças consensuais desejáveis na prática educativa dos físicos-educadores que necessariamente incluem apreensão e uso crítico de TDIC.

  11. Un estudio multinivel basado en PISA 2003: factores de eficacia escolar en el área de matemáticas. A Multilevel Study Based on PISA 2003: School Effectiveness Factors in the area of Mathematics

    Directory of Open Access Journals (Sweden)

    Covadonga Ruiz de Miguel

    2006-11-01

    Full Text Available En el artículo se presenta un modelo multinivel realizado a partir de los datos obtenidos en el estudio PISA 2003. El modelo incluye tres niveles (estudiante, escuela, país y variables relacionadas con la eficacia escolar, utilizando el rendimiento en matemáticas como variable dependiente, a partir de los valores plausibles que el estudio facilita para cada alumno. Los resultados obtenidos permiten concluir que variables como estructura familiar, sexo, nivel socioeconómico (tanto de la familia como de la escuela, recursos educativos del hogar, calidad de los recursos de la escuela, expectativas educativas del alumno, tamaño de la escuela, formación del profesorado y recursos económicos que el país destina a la educación, tienen una notable influencia sobre el rendimiento de los alumnos en el área de matemáticas. This article presents a school effectiveness multilevel model based on PISA 2003 data. Our focus is math achievement. We employ a three level model (student, school and country with variables related to school effectiveness as predictors of student achievement. We use a methodology that takes into account the multiple plausible values generated by PISA for each student. Results show that family structure, gender, family and school socioeconomic status, home educational resources, quality of school resources, student educational expenditures, school size, teacher education and country economic resources devoted to education all have sizable influence on mathematics achievement.

  12. The OECD PISA Study as a Soft Power in Education? Lessons from Switzerland and the US

    Science.gov (United States)

    Bieber, Tonia; Martens, Kerstin

    2011-01-01

    Although originally created for economic purposes, the Organisation for Economic Co-Operation and Development (OECD) has increasingly gained weight in education policy in recent years and is now regarded as an international authority in the field, particularly through its "Programme for International Student Assessment" (PISA), which was…

  13. School Climate in American Secondary Schools: A Psychometric Examination of PISA 2009 School Climate Scale

    Science.gov (United States)

    Sun, Letao; Royal, Kenneth

    2017-01-01

    The purpose of this study was to examine the quality of the Program for International Student Assessment (PISA) 2009 school climate survey instrument and evaluate perceptions of secondary school principals' located in the United States about school climate using an Item Response Theory (IRT) methodological approach. In particular, this study…

  14. Relative Private School Effectiveness in the Netherlands: A Reexamination of PISA 2006 and 2009 data

    NARCIS (Netherlands)

    Cornelisz, Ilja

    2013-01-01

    An ongoing question is whether private (religious) schools provide better education than public schools. This study re- addresses this issue, using PISA 2006 and 2009 data for the Netherlands and three different methodologies. Overall, there is no consistent pattern. Results based on ordinary least

  15. Cultural Capital--A Shift in Perspective: An Analysis of PISA 2009 Data for Croatia

    Science.gov (United States)

    Puzic, Saša; Gregurovic, Margareta; Košutic, Iva

    2016-01-01

    Using PISA 2009 data for Croatia, this paper addresses the relationship between socio-economic background, cultural capital and educational attainment. Following Bourdieu, we emphasized the importance of interpreting cultural capital effects as effects of family habitus. The results indicated that the material and the relational dimension of…

  16. A New Global Policy Regime Founded on Invalid Statistics? Hanushek, Woessmann, PISA, and Economic Growth

    Science.gov (United States)

    Komatsu, Hikaru; Rappleye, Jeremy

    2017-01-01

    Several recent, highly influential comparative studies have made strong statistical claims that improvements on global learning assessments such as PISA will lead to higher GDP growth rates. These claims have provided the primary source of legitimation for policy reforms championed by leading international organisations, most notably the World…

  17. Labour Market and Flexibility. A logistic regression model to estimate the likelihood of being atypical for a woman employed in Pisa

    OpenAIRE

    Paola Meozzi

    2014-01-01

    How do demographic and educational factors affect a woman’s occupational status? How common is non standard employment for different labour force groups and in different sectors of the labour market? This paper aims at analysing the impact of different “structural variables” in terms of risk for a woman working in the province of Pisa to be employed with a non-standard contract. Determinants of women’s atypical employment in Pisa are studied using microdata for approximately 425.000 women emp...

  18. Prevalencia y grado de gingivitis asociada a placa dentobacteriana en niños

    Directory of Open Access Journals (Sweden)

    Miriam Lucía Rocha Navarro

    2014-01-01

    Full Text Available Introducción: Las enfermedades periodontales (EPs son comunes en niños y adolescentes, y algunas son rápidamente destructivas. El consenso internacional de Periodontología de 1999, vigente hasta hoy día, incluyó a la gingivitis como parte de las EPs. Este estudio se enfocó en la gingivitis inducida por placa dentobacteriana (PDB. Estudios previos reportan porcentajes similares de prevalencia en niños Nigerianos, Polacos y Tanzaneses de alrededor del 54.4%. Sin embargo Oh TJ y col. encontró una presencia del 70% en niños Estadounidenses. En México, hay una amplia discrepacia en su prevalencia que oscila entre el 20.6% - 91.3%. Método: Estudio observacional, transversal y descriptivo de niños que acudieron al Departamento de Odontopediatría de la Universidad de La Salle Bajío, A. C. Se revisó un total de 545 niños, y de ellos se reclutaron 350 niños con gingivitis de entre 3-14 años de edad, ambos sexos, clasificados sistémicamente como tipo I y II y sin capacidades diferentes. El protocolo de investigación fue revisado y aprobado por el Comité Ético Institucional. Los padres de los niños incluidos firmaron una Carta de Consentimiento Informado. A los niños se les aplicó un cuestionario de salud sistémica y uno de higiene dental, así como evaluación clínica, periodontal y de control de PDB. A los padres se les aplicó un cuestionario de hábitos higiénicos y preventivos. Se utilizó estadística descriptiva, X2 y correlación múltiple. Resultados: Los niños presentaron una prevalencia de 64.2%, con una mediana grado I de gingivitis, sin embargo, se observó una tendencia a incrementarse el grado de ésta, conforme el niño tenía más edad, así como un incremento en la presencia de PDB de acuerdo con el índice de O’Leary. No se observaron diferencias en el grado de gingivitis entre sexos. Conclusión: El índice gingival en los niños estudiados es grado I, que es considerado leve y éste es independiente del

  19. Los grados de asimilación económica del Estado de Guerrero, a fines del siglo XX /

    OpenAIRE

    García Castro, Neftalí

    2011-01-01

     tesis que para obtener el grado de Doctor en Geografía, presenta Neftalí García Castro ; asesor Álvaro Sánchez Crispín. 186 páginas : diagramas, mapas. Doctorado en Geografía UNAM, Facultad de Filosofía y Letras, 2011

  20. Lessons Learned from PISA: A Systematic Review of Peer-Reviewed Articles on the Programme for International Student Assessment

    Science.gov (United States)

    Hopfenbeck, Therese N.; Lenkeit, Jenny; El Masri, Yasmine; Cantrell, Kate; Ryan, Jeanne; Baird, Jo-Anne

    2018-01-01

    International large-scale assessments are on the rise, with the Programme for International Student Assessment (PISA) seen by many as having strategic prominence in education policy debates. The present article reviews PISA-related English-language peer-reviewed articles from the programme's first cycle in 2000 to its most current in 2015. Five…

  1. PISA: LIGHTS AND SHADES

    Directory of Open Access Journals (Sweden)

    Ángel Díez Baldero

    2014-12-01

    In this communication the authors approach the study of information which is from society knowledge of the mass media and the results of the test done by PISA (the importance of the family, the studies and expectations regarding to their children. Finally they approach the concept of EQUITY and the results that Spain has reached in this area.

  2. The Effects of Upper-Secondary Education and Training Systems on Skills Inequality. A Quasi-Cohort Analysis Using PISA 2000 and the OECD Survey of Adult Skills

    Science.gov (United States)

    Green, Andy; Pensiero, Nicola

    2016-01-01

    Research tells us much about the effects of primary and lower-secondary schooling on skills inequality, but we know less about the impact of the next stage of education. This article uses a differences-in-differences analysis of data on literacy and numeracy skills in PISA 2000 and SAS 2011/12 to assess the contribution of upper-secondary…

  3. Leyendo los lenguajes de PISA críticamente: un análisis a través del inmigrante

    Directory of Open Access Journals (Sweden)

    Ligia López

    2013-01-01

    Full Text Available Este artículo es una invitación a notar. Leer los lenguajes de PISA de forma crítica nos permite entender hasta cierto punto las razones que fundamentan los esfuerzos de medición estandarizada. Así, el artículo, en primer lugar, analiza los lenguajes sobre la comparación, el desarrollo y equidad y los números que PISA emplea para justificar su proyecto. Segundo discute un caso en particular donde PISA se entiende como un gesto celebratorio para incluir al “migrante” y las limitaciones que tiene la prueba para dar una respuesta apropiada sobre cómo resolver el problema de exclusión. Tercero el artículo ofrece una lectura de las preguntas de la prueba donde se pone el énfasis en los lenguajes de PISA relacionados principalmente con el desarrollo y la equidad. Finalmente, y en forma de conclusión, el migrante es discutido no como objeto minoritario sino como elemento que puede desencadenar diferentes tipos de relaciones en/con el mundo de la educación.

  4. Education Policy in Poland: The Impact of PISA (and Other International Studies)

    Science.gov (United States)

    Bialecki, Ireneusz; Jakubowski, Maciej; Wisniewski, Jerzy

    2017-01-01

    The impact of the PISA study on Polish education policy has been significant, but probably different from any other country. Poland has not experienced the so-called "PISA shock," but its education system has been benefiting considerably from PISA. For experts and policy makers, it has been a useful and reliable instrument that has made…

  5. The Role of PISA in Shaping Hegemonic Educational Discourses, Policies and Practices: The Case of Spain

    Science.gov (United States)

    Bonal, Xavier; Tarabini, Aina

    2013-01-01

    The aim of this article is to analyse the direct and indirect effects that PISA generates in the orientation of educational policies and reforms in Spain and the ways in which PISA data and results are used in political discourses, at both national and sub-national levels. The main hypothesis of the article is that PISA results have played a key…

  6. Estrategias Didácticas con Cuadernia para elevar el Rendimiento Escolar el el Área de Matemática del Primer Grado de Secundaria Institución Educativa “San Carlos”- Monsefú. Chiclayo - 2016.

    OpenAIRE

    Mimbela Sánchez, Rosa Yessenia

    2017-01-01

    La presente investigación titulada: “Estrategias Didácticas con Cuadernia para elevar el rendimiento escolar en el área de matemática del Primer Grado “B” de secundaria. Institución educativa “San Carlos”- Monsefú.Chiclayo.2016.” surge porque que los estudiantes de la institución educativa “San Carlos” presentan dificultades para resolver problemas en el área de matemática lo que origina un bajo rendimiento escolar, además se ha evidenciado que los docentes no incorporan las Te...

  7. Developing Mathematics Problems Based on Pisa Level

    Directory of Open Access Journals (Sweden)

    Shahibul Ahyan

    2014-01-01

    Full Text Available This research aims to produce mathematics problems based on PISA level with valid and practical content of change and relationships and has potential effect for Junior High School students. A development research method developed by Akker, Gravemeijer, McKenney and Nieveen is used this research. In the first stage, the researcher analyzed students, algebra material in school-based curricula (KTSP and mathematics problems of PISA 2003 of change and relationships content. The second stage, the researcher designed 13 problems with content of change and relationships. The last, the researcher used formative evaluation design developed by Tessmer which includes self evaluation, one-to-one, expert review, small group, and field test. The data collect by walk through, interview, and questionnaire. The result of this research indicated that 12 mathematical problems based on PISA level of change and relationships content that developed have validity, practically, and potential effects for Junior High School students.

  8. Presentación de la Asignatura Laboratorio Integrado de Química Grado en Biotecnología

    OpenAIRE

    Rodríguez-Izquierdo, José María

    2012-01-01

    Seminario de Presentación de la asignatura Laboratorio Integrado de Química del Grado en Biotecnología. Esta presentación se realizó en el marco del proyecto de innovación docente: “Puesta en Marcha y Mejora del Laboratorio Integrado de Química en la Titulación de Biotecnología” (Ref: PI2_12_016)

  9. Moss ciliated protozoa as bioindicators. A study on the urban area of Pisa (Italy); Protozoi ciliati del muschio come biondicatori. Uno studio nell'area urbana di Pisa

    Energy Technology Data Exchange (ETDEWEB)

    Verni, F.; Rosati, G. [Pisa Univ., Pisa (Italy). Dipt. di Etologia, Ecologia, Evoluzione

    2000-07-01

    Samples of moss were collected, every month for 7 months, from five zones of Pisa (S2, S3, S4, S5, S6) and a woody zone (S1) as control. For each sample the type and the number of the ciliate species as well as the number of individuals for each species were determined. Lead content was also measured. The data were statistically elaborated and compared. The diversity Shannon index (H) was calculated to determine the health state of ciliate communities. In any case an inverse correlation between H and the lead content was reported; the highest the H value, the lowest the lead content and vice versa. On the basis of the results here reported the use of Ciliates as biondicators appears suitable for the control of urban soil. An analysis like this appears advantageous as it is rather simple and cheap and allows to determine the possible variations in a real time. [Italian] Sono stati analizzati campioni di muschio prelevati, con cadenza mensile per 7 mesi, in 5 stazioni di Pisa (S2, S3, S4, S5, S6) e da una zona boscosa (S1), come controllo. Per ogni campione si e' proceduto all'identificazione dei Ciliati presenti, al conteggio delle specie e del numero di individui per specie, nonche' alla misurazione del piombo presente. I dati sono stati confrontati dopo elaborazione statistica. L'indice della diversita' di Shannon ha fornito informazioni sulla salute della comunita' dei Protozoi delle varie stazioni. In ogni caso risulta una correlazione inversa tra i valori dell'indice di Shannon e la quantita' di piombo: S5, la stazione piu' esposta al traffico, risulta quella piu' degradata. L'uso dei Ciliati come biondicatori risulta quindi appropriato e vantaggioso considerando che e' semplice, poco costoso e permette di valutare in tempi reali variazioni nell'ambiente.

  10. El aprendizaje de los escolares del multígrado con la tecnología educativa

    Directory of Open Access Journals (Sweden)

    Dora Caridad Peña-Infante

    2013-01-01

    Full Text Available Abordó el empleo de la tecnología educativa en la escuela primaria multígrado derivado de los problemas de aprendizaje que presentan los escolares de este contexto y las insuficientes sugerencias metodológicas que poseen los docentes para la utilización de estos medios en el proceso pedagógico. Se tomó como referencia los resultados de la Tesis de Maestría defendida en el 2008 por la autora principal del artículo, además se procesó la información empírica obtenida mediante la aplicación de diferentes métodos y se generalizaron sus resultados, apoyados en el estudio de diversos textos y documentos relativos al estudio de las escuelas multígrado, escritos por reconocidos especialistas cubanos. El objetivo principal del artículo fue ofrecer al lector un conjunto de consideraciones teórico-prácticas acerca de cómo utilizar la tecnología educativa como recurso didáctico en el proceso pedagógico de la escuela multígrado para favorecer el aprendizaje de los escolares.

  11. Nuclear and Electron Relaxation. Chianti Workshop on Magnetic Resonance (3rd) Held in San Miniato, Pisa, Italy on May 28-June 2, 1989

    Science.gov (United States)

    1989-06-01

    nucleari e l probabiiit6 di transizione del sistema elettrone-protoni metilici in un cristallo irradiato di 1-alanina sono stati deterininati in un...applicabile al sistema in studio. La tecnica sperimentale 6 stata semplificata e sviluppata in alcuni dei suoi aspetti strumentali. (1) C. Pinzino, J...fcc the ’ ’ h-i t-c -i-m pou nc1 Jisce toc the aba ne c+ rur cc cf ±e i i -en t Ji 1 ) r r ci a a t cm ’n 1 H cr / and 1 Fl 1i t h in the rr, ri c - nd

  12. Análisis de la competencia científica de alumnado de secundaria: respuestas y justificaciones a ítems de PISA

    Directory of Open Access Journals (Sweden)

    Beatriz Crujeiras Pérez

    2015-01-01

    Full Text Available En este artículo se analiza el desarrollo de la competencia científica de alumnado de secundaria examinando: asus respuestas y justificaciones a ítems de opción de respuesta múltiple utilizados en la evaluación PISA; y b elefecto que tiene la realización de actividades de laboratorio de indagación que abordan los desempeños evaluadosen PISA sobre la adquisición de la competencia.Los participantes son 21 estudiantes de un centro público cursando la materia de Física y Química en 3º y 4º deESO. Se analizan las respuestas escritas a los ítems PISA al principio y al final del estudio a través de una rúbricarelacionada con los niveles de desempeño establecidos en PISA (OCDE, 2008 para las competencias científicasde identificar cuestiones científicas y usar pruebas científicas. Se comparan los resultados obtenidos al inicio y alfinal del estudio en porcentajes de las opciones de respuesta seleccionadas y de las justificaciones a cada opciónde respuesta. Se identifican diferencias en los resultados obtenidos en la selección de opción de respuesta correctay en la justificación de la misma, así como en los resultados y justificaciones al principio y al final del estudio.

  13. 'AER Working Group D On WWER Safety Analysis' Report Of The Meeting In Pisa, Italy, 26-27 April 2006

    International Nuclear Information System (INIS)

    Siltanen, P.

    2006-01-01

    AER Working Group D on WWER reactor safety analysis held its 15 t h meeting in Grand Hotel Duomo in Pisa, Italy during the period 26-27 April 2006. The meeting was hosted by the University of Pisa following the fourth workshop on the OECD/DOE/CEA WWER-1000 Coolant Transient Benchmark (W1000-CT) held at the same location on 24-25 April. Altogether 15 participants attended the Working Group D meeting, 11 from AER member organizations and 4 guests from non-member organizations. The coordinator for the working group, Mr. P. Siltanen (FNS) served as chairman. In addition to general information exchange on recent activities in the participating organizations, the topics of the meeting included: 1) Code development and benchmarking for reactor dynamics applications. 2) Safety analysis methodology and results. 3) Future activities. A list of participants and a list of handouts distributed at the meeting are attached to the report (Author)

  14. Gender differences in reaching top roles in banking: a cross-sectional study performed by bankers work in province of Pisa

    Directory of Open Access Journals (Sweden)

    Vittoria Colamesta

    2015-09-01

    Full Text Available The financial industry is a pivot of the economy and plays an important social role.Goal of this study was to analyze factors associated with the framing level in banking in the province of Pisa.We collected data about age, gender, framing level, workplace and type of bank for bankers in Pisa through trade unionists.We collected data on 2018 workers and we found significant associations between framing level and aged over 40 years (OR = 4.5; 95% CI: 2.9-6.9, workplace in Pisa (OR = 0.30; 95% CI: 0.20-0.44 and male gender (OR = 2.89; 95% CI: 1.98-4.21.The first two factors are explainable with organizational characteristics. In fact for becoming manager you already have to work a number of year and in cities rather than in the surrounding municipalities, consistent with the size of bank.However, the third factor, already known in the literature in other work areas, requires further studies for explaining causes and helping to implement actions to reduce the gender gap.

  15. High intensity multi beam design of SANS instrument for Dhruva reactor

    Energy Technology Data Exchange (ETDEWEB)

    Abbas, Sohrab, E-mail: abbas@barc.gov.in; Aswal, V. K. [Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India); Désert, S. [Laboratoire Leon Brillouin, CEA, Saclay, 91191 (France)

    2016-05-23

    A new and versatile design of Small Angle Neutron Scattering (SANS) instrument based on utilization of multi-beam is presented. The multi-pinholes and multi-slits as SANS collimator for medium flux Dhruva rearctor have been proposed and their designs have been validated using McStas simulations. Various instrument configurations to achieve different minimum wave vector transfers in scattering experiments are envisioned. These options enable smooth access to minimum wave vector transfers as low as ~ 6×10{sup −4} Å{sup −1} with a significant improvement in neutron intensity, allowing faster measurements. Such angularly well defined and intense neutron beam will allow faster SANS studies of agglomerates larger than few tens of nm.

  16. Montenegro in the PISA Study

    Directory of Open Access Journals (Sweden)

    Saša Milić

    2011-01-01

    Full Text Available Montenegro, a country that has been in transition for the last two decades, is trying intensively to restructure its socioeconomic system and reform the main social systems, such as the education system, health care, the judicial system, the social welfare system, etc. Numerous strategic documents have been adopted in the past decade emphasising the importance of making the country’s abundant natural resources functional, and of making the utilisation of human resources in the country significantly more effective. In order to achieve improvements in one of the key areas of Montenegrin development, human resources, a reform of the entire education system was launched in the first years of 21st century. The processes of joining the European Union, whose fundamental principles are the free movement of people, goods, services and capital, have also significantly increased the need to raise the quality of the educationof Montenegro’s citizens and to improve the competitiveness of the Montenegrin workforce in the labour market. However, we believe that the results of PISA testing in 2006 and 2009 suggest that Montenegro is far from the proclaimed goals of reform in the field of education, and that for the coming years and decades considerable attention should be devoted to improvement of the education system. PISA tests should be understood in a much wider context, not only as a reflection of curricular reform and standards of verification and assessment of students’ knowledge, but rather as a set of guidelines that indicate the direction in which to develop and improve the education system, so that society can really ‘invest’ in the education of young people.It is a very problematic fact that from the time of testing in 2009 until April 2011, nobody in Montenegro published any technical or scientific analysis of the success, or rather failure, of Montenegrin students in PISA testing. We believe that the use of this study should be

  17. Seguimiento de la adquisición de competencias profesionales en el Grado de Psicología

    OpenAIRE

    Zubiauz de Pedro, Begoña; Mayor Cinca, María Ángeles; Arana Martínez, José María; Ortiz Oria, Vicente; Jenaro Río, Cristina; García-Meilán, Juan José

    2014-01-01

    El presente trabajo pretende comprobar qué nivel de competencia perciben haber alcanzado los estudiantes del Grado de Psicología en aquellas actividades directamente relacionadas con las tareas de su desempeño profesional. La muestra la constituyen alumnos de varios cursos de Psicología de la Universidad de Salamanca. Los estudiantes responderán on-line, al final de curso, a un cuestionario de autopercepción de competencias profesionales (1=Nada competente; 5=Muy competente) correspondientes ...

  18. FISCALIDAD DE LAS SOCIEDADES COOPERATIVAS DE SEGUNDO GRADO./SECOND DEGREE COOPERATIVES FROM A TAX POINT OF VIEW

    Directory of Open Access Journals (Sweden)

    Emilio NAVARRO HERAS

    2007-01-01

    Full Text Available Este artículo trata de mostrar la especial tributación de las sociedades cooperativas de segundo grado, como instrumento de integración tradicionalmente utilizado por las sociedades cooperativas para emprender procesos de concentración. Centraremos el estudio de su fiscalidad en el Impuesto sobre Sociedades por las particularidades tributarias que presenta el mismo en este tipo societario. Respecto a este impuesto las sociedades cooperativas de segundo grado pueden optar por tributar como simples sociedades cooperativas, acogiéndose a la Ley 20/1990, de 19 de diciembre, sobre Régimen Fiscal de Cooperativas, o hacerlo como grupo cooperativo, amparándose en el régimen especial de tributación consolidada establecido para este tipo social. Al igual que las sociedades de primer grado éstas disfrutan de una serie de beneficios fiscales tanto en la imposición directa como en la indirecta, como consecuencia de la naturaleza social de las mismas./In this paper we show the special tax system of the second degree cooperatives, as a mean of integration used by them for concentration processes. We focus on the income tax for its legal peculiarities for this kind of firms. In relation to this same tax, second degree cooperatives can choose between to pay their taxes as simple cooperatives (Law 20/1990, December 19th or as cooperative groups (Consolidation taxation. As first degree cooperatives, these ones have some tax profits in direct and indirect taxation due to their social nature.

  19. A case for historic joint rupture of the San Andreas and San Jacinto faults

    OpenAIRE

    Lozos, Julian C.

    2016-01-01

    The San Andreas fault is considered to be the primary plate boundary fault in southern California and the most likely fault to produce a major earthquake. I use dynamic rupture modeling to show that the San Jacinto fault is capable of rupturing along with the San Andreas in a single earthquake, and interpret these results along with existing paleoseismic data and historic damage reports to suggest that this has likely occurred in the historic past. In particular, I find that paleoseismic data...

  20. Factores asociados a la compresión lectora en estudiantes de noveno grado de Barranquilla

    Directory of Open Access Journals (Sweden)

    Mónica Paola Franco Montenegro

    2016-07-01

    Full Text Available El presente artículo es resultado de una investigación cuyo objetivo consistió en determinar la incidencia de los factores asociados al desarrollo de la comprensión lectora en estudiantes de noveno grado de la Institución Educativa Distrital Jesús Maestro Fe y Alegría de Barranquilla. Asumiendo que la comprensión lectora está presente en la vida como fuente de entendimiento y placer, esta investigación surge porque los docentes en aula han identificado que los estudiantes presentan dificultades en el proceso lector que pueden estar asociadas a factores académicos, socioculturales y personales. El diseño es de carácter Mixto (cualitativo-cuantitativo y las técnicas de recolección de información fueron: entrevista y encuestas con preguntas cerradas y abiertas. Los resultados evidenciaron que el 50% de los estudiantes poseen la habilidad para comprender lo que leen, pero su contexto familiar no acompaña los procesos y en lo escolar no hay ambientes que motiven la lectura. Lo anterior se evidencia en el desempeño escolar de los mismos. Ante este problema, la institución debe gestionar estrategias pedagógicas para fomentar procesos lectores en los que se integren las áreas del conocimiento, así como crear espacios para el desarrollo de la lectura y su comprensión. Abstract This article is the result of research and its main work objective is to determine the incidence of the factors associated with the development of Reading Comprehension for ninth grade students of School District Jesús Maestro Fe y Alegría of Barranquilla. Based on the fact that reading comprehension is present in life as a source of understanding and pleasure, because when learners read, they are generally motivated to think and respond with answers; this research arises because teachers in the classroom identify those students that have difficulties in the reading process, which in turn may be associated with academic, cultural and personal factors that

  1. Lessons learned from the scaling-up of a weekly multimicronutrient supplementation program in the integrated food security program (PISA).

    Science.gov (United States)

    Lechtig, Aarón; Gross, Rainer; Vivanco, Oscar Aquino; Gross, Ursula; López de Romaña, Daniel

    2006-01-01

    Weekly multimicronutrient supplementation was initiated as an appropriate intervention to protect poor urban populations from anemia. To identify the lessons learned from the Integrated Food Security Program (Programa Integrado de Seguridad Alimentaria [PISA]) weekly multimicronutrient supplementation program implemented in poor urban populations of Chiclayo, Peru. Data were collected from a 12-week program in which multimicronutrient supplements were provided weekly to women and adolescent girls 12 through 44 years of age and children under 5 years of age. A baseline survey was first conducted. Within the weekly multimicronutrient supplementation program, information was collected on supplement distribution, compliance, biological effectiveness, and cost. Supplementation, fortification, and dietary strategies can be integrated synergistically within a micronutrient intervention program. To ensure high cost-effectiveness of a weekly multimicronutrient supplementation program, the following conditions need to be met: the program should be implemented twice a year for 4 months; the program should be simultaneously implemented at the household (micro), community (meso), and national (macro) levels; there should be governmental participation from health and other sectors; and there should be community and private sector participation. Weekly multimicronutrient supplementation programs are cost effective options in urban areas with populations at low risk of energy deficiency and high risk of micronutrient deficiencies.

  2. Relación entre la Inteligencia Emocional y la Capacidad de Atención - Concentración en estudiantes de 2º grado de educación secundaria de la I.E. “Gran Amauta” N° 3037, del Distrito de San Martín de Porres, 2014.

    OpenAIRE

    Taira Oshiro, Stephanie Chiemy

    2015-01-01

    Lo que se realizó en esta investigación fue determinar la relación que existe entre la Inteligencia Emocional y la capacidad de Atención - Concentración en los estudiantes de segundo grado de secundaria de la I.E “Gran Amauta” distrito de San Martin de Porres, 2014. Esta investigación corresponde al enfoque cuantitativo. Es una investigación básica sustantiva que se ubica en el nivel descriptivo. El diseño de la investigación ha sido correlacional de corte transversal, que e...

  3. Grado de motivación por el aprendizaje en estudiantes de enfermería de una universidad pública.

    OpenAIRE

    Casanova-Rubio, María; Loli-Ponce, Rudi; Sandoval-Vegas, Miguel; Velásquez-Perales, Rosa

    2017-01-01

    Objetivos: Determinar el grado de Motivación por el Aprendizaje en estudiantes de Enfermería de la UNMSM en el año 2012. Material y Métodos: Investigación descriptiva, cuantitativa, de corte transversal. La muestra estuvo conformada por 68 estudiantes de Enfermería. El grado de motivación se determinó mediante la aplicación de un cuestionario tipo Likert modificada, sometida a juicio de expertos (p

  4. Análisis de los discursos de los alumnos del Grado de Publicidad y Relaciones Públicas del Campus María Zambrano, con respecto al software

    OpenAIRE

    Aguilar García, Alberto

    2017-01-01

    Este trabajo de fin de grado presenta un análisis del discurso de los alumnos del Campus María Zambrano que estudian el grado de Publicidad y Relaciones Públicas. En este proyecto se plantea las cuestiones referidas a la imagen mental de dichos alumnos acerca de los distintos software, el hardware que se utiliza hoy en día, de las licencias que se adquieren, y de las marcas que se pagan. A grandes rasgos es una revisión crítica y un análisis racional de las distintas utilidades del software d...

  5. Rotating reactors : a review

    NARCIS (Netherlands)

    Visscher, F.; Schaaf, van der J.; Nijhuis, T.A.; Schouten, J.C.

    2013-01-01

    This review-perspective paper describes the current state-of-the-art in the field of rotating reactors. The paper has a focus on rotating reactor technology with applications at lab scale, pilot scale and industrial scale. Rotating reactors are classified and discussed according to their geometry:

  6. Operation and maintenance experience at the General Atomic Company's TRIGA reactor facility at San Diego, California

    International Nuclear Information System (INIS)

    Whittemore, W.L.; Stout, W.A.; Shoptaugh, J.R.; Chesworth, R.H.

    1982-01-01

    Since the startup of the original 250 kW TRIGA Mark I reactor in 1958, General Atomic Company has accumulated nearly 24 years of operation and maintenance experience with this type of reactor. In addition to the nearly 24 years of experience gained on the Mark I, GA has operated the 1.5 MW Advanced Prototype Test Reactor (Mark F) for 22 years and operated a 2 MW below-ground TRIGA Mark III for five years. Information obtained from normal and abnormal operation are presented. (author)

  7. Indicadores de depresión en niños de cuarto a sexto grado de primaria en la ciudad de Huancayo

    OpenAIRE

    Ávila Benito, Carlos; Espinoza Ventura, Juan Carlos

    2016-01-01

    Esta investigación tuvo como finalidad identificar en qué medida se presentan los indicadores de la depresión infantil en niños de 4° agrado de primaria y observar las diferencias de la presencia de síntomas depresivos entre grados, sexos, tipos de familias y tipos de colegios en el contexto de la Provincia de Huancayo. La investigación fue de tipo cuantitativo, con un diseño no experimental de tipo transversal descriptivo; se aplicó el Cuestionario de Depresión Infantil (CDI) que mide el...

  8. Base emocional de la ciudadanía. Narrativas de emociones morales en estudiantes de noveno grado

    Directory of Open Access Journals (Sweden)

    Edgar Mauricio Martínez

    2016-01-01

    Full Text Available Nuestro objetivo en este artículo es presentar la interpretación de narrativas de emociones morales de estudiantes de noveno grado; en particular, centramos el estudio en dar cuenta de aquellas que extienden o impiden el interés moral por la vida ciudadana. Asumimos la perspectiva teórica que considera que las emociones son cognitivas. El abordaje metodológico es cualitativo. Interpretamos narraciones en estudiantes de ambos sexos y encontramos narrativas relacionadas con la vergüenza, la repugnancia, la compasión, la envidia, la humillación y la gratitud. En el presente texto analizamos algunas de ellas y las creencias que las soportan. La información obtenida nos permite describir valores existentes en los estudiantes y las estudiantes, emociones que favorecen o no la convivencia escolar, y el rol que juegan en una comunidad que aspira a ser democrática.

  9. Base emocional de la ciudadanía. Narrativas de emociones morales en estudiantes de noveno grado

    Directory of Open Access Journals (Sweden)

    Edgar Mauricio Martínez

    2016-02-01

    Full Text Available Nuestro objetivo en este artículo es presentar la interpretación de narrativas de emociones morales de estudiantes de noveno grado; en particular, centramos el estudio en dar cuenta de aquellas que extienden o impiden el interés moral por la vida ciudadana. Asumimos la perspectiva teórica que considera que las emociones son cognitivas. El abordaje metodológico es cualitativo. Interpretamos narraciones en estudiantes de ambos sexos y encontramos narrativas relacionadas con la vergüenza, la repugnancia, la compasión, la envidia, la humillación y la gratitud. En el presente texto analizamos algunas de ellas y las creencias que las soportan. La información obtenida nos permite describir valores existentes en los estudiantes y las estudiantes, emociones que favorecen o no la convivencia escolar, y el rol que juegan en una comunidad que aspira a ser democrática

  10. Grado de alfabetización informacional del profesorado de Secundaria en España: Creencias y autopercepciones

    Directory of Open Access Journals (Sweden)

    Mercè Gisbert Cervera

    2015-07-01

    Full Text Available La alfabetización informacional es una de las dimensiones de la competencia digital y, como tal, debe ser tenida muy en cuenta dentro de las competencias asumibles por cualquier persona en nuestros días, inmersa en la sociedad de la información y la comunicación, pero más concretamente por el profesorado de Educación Secundaria dada la gran importancia que tiene esta etapa en la formación de los alumnos. En este estudio hemos querido conocer cuál es el grado de alfabetización informacional del profesorado de Secundaria del estado español. Para ello hemos construido y aplicado un cuestionario (n=2.656. En dicho instrumento hemos sometido al profesorado a dos partes bien diferenciadas, una con cuestiones de creencia y autopercepción sobre los indicadores de la alfabetización informacional, y por otra, con cuestiones de situación, casos prácticos en los que el profesorado ha tenido que poner en práctica las habilidades y destrezas que tiene sobre la alfabetización informacional. Los resultados obtenidos confirman que las creencias del profesorado de Educación Secundaria dan valores bastante elevados pero también nos muestran que si bien el grado de alfabetización informacional del profesorado consigue el aprobado, hay ciertos aspectos de los indicadores relativos a la evaluación, gestión y transformación de la información donde los docentes tienen graves carencias. Todo ello pone de manifiesto la necesidad de plantear un plan formativo en alfabetización informacional del profesorado de Educación Secundaria de España.

  11. Investigation of interactions between poly-L-lysine-coated boron nitride nanotubes and C2C12 cells: up-take, cytocompatibility, and differentiation

    Directory of Open Access Journals (Sweden)

    G Ciofani

    2010-04-01

    Full Text Available G Ciofani1, L Ricotti1, S Danti2,3, S Moscato4, C Nesti2, D D’Alessandro2,4, D Dinucci5, F Chiellini5, A Pietrabissa3, M Petrini2,3, A Menciassi1,61Scuola Superiore Sant’Anna, Pisa, Italy; 2CUCCS-RRMR, Center for the Clinical Use of Stem Cells – Regional Network of Regenerative Medicine, 3Department of Oncology, Transplants and Advanced Technologies, 4Department of Human Morphology and Applied Biology, University of Pisa, Pisa, Italy; 5Laboratory of Bioactive Polymeric Materials for Biomedical and Environmental Applications (BIOlab, UdR INSTM, Department of Chemistry and Industrial Chemistry, University of Pisa, San Piero a Grado, Italy; 6Italian Institute of Technology, Genova, ItalyAbstract: Boron nitride nanotubes (BNNTs have generated considerable interest within the scientific community by virtue of their unique physical properties, which can be exploited in the biomedical field. In the present in vitro study, we investigated the interactions of poly-L-lysine-coated BNNTs with C2C12 cells, as a model of muscle cells, in terms of cytocompatibility and BNNT internalization. The latter was performed using both confocal and transmission electron microscopy. Finally, we investigated myoblast differentiation in the presence of BNNTs, evaluating the protein synthesis of differentiating cells, myotube formation, and expression of some constitutive myoblastic markers, such as MyoD and Cx43, by reverse transcription – polymerase chain reaction and Western blot analysis. We demonstrated that BNNTs are highly internalized by C2C12 cells, with neither adversely affecting C2C12 myoblast viability nor significantly interfering with myotube formation.Keywords: boron nitride nanotubes, C2C12 cells, cytocompatibility, up-take, differentiation, MyoD, connexin 43

  12. A case for historic joint rupture of the San Andreas and San Jacinto faults

    Science.gov (United States)

    Lozos, Julian C.

    2016-01-01

    The San Andreas fault is considered to be the primary plate boundary fault in southern California and the most likely fault to produce a major earthquake. I use dynamic rupture modeling to show that the San Jacinto fault is capable of rupturing along with the San Andreas in a single earthquake, and interpret these results along with existing paleoseismic data and historic damage reports to suggest that this has likely occurred in the historic past. In particular, I find that paleoseismic data and historic observations for the ~M7.5 earthquake of 8 December 1812 are best explained by a rupture that begins on the San Jacinto fault and propagates onto the San Andreas fault. This precedent carries the implications that similar joint ruptures are possible in the future and that the San Jacinto fault plays a more significant role in seismic hazard in southern California than previously considered. My work also shows how physics-based modeling can be used for interpreting paleoseismic data sets and understanding prehistoric fault behavior. PMID:27034977

  13. A case for historic joint rupture of the San Andreas and San Jacinto faults.

    Science.gov (United States)

    Lozos, Julian C

    2016-03-01

    The San Andreas fault is considered to be the primary plate boundary fault in southern California and the most likely fault to produce a major earthquake. I use dynamic rupture modeling to show that the San Jacinto fault is capable of rupturing along with the San Andreas in a single earthquake, and interpret these results along with existing paleoseismic data and historic damage reports to suggest that this has likely occurred in the historic past. In particular, I find that paleoseismic data and historic observations for the ~M7.5 earthquake of 8 December 1812 are best explained by a rupture that begins on the San Jacinto fault and propagates onto the San Andreas fault. This precedent carries the implications that similar joint ruptures are possible in the future and that the San Jacinto fault plays a more significant role in seismic hazard in southern California than previously considered. My work also shows how physics-based modeling can be used for interpreting paleoseismic data sets and understanding prehistoric fault behavior.

  14. Pisa Question and Reasoning Skill

    Directory of Open Access Journals (Sweden)

    Ersoy Esen

    2017-01-01

    Full Text Available The objective of the study is to determine the level of the reasoning skills of the secondary school students. This research has been conducted during the academic year of 2015-2016 with the participation of 51 students in total, from a province in the Black Sea region of Turkey by using random sampling method. Case study method has been used in this study, since it explains an existing situation. In this study, content analysis from the qualitative research methods was carried out. In order to ensure the validity of the scope, agreement percentage formula was used and expert opinions were sought.The problem named Holiday from the Chapter 1 of the normal units in Problem Solving Questions from PISA (Program for International Student Assessments [35] are used as the data collection tool for the study. The problem named Holiday consists of two questions. Applied problems were evaluated according to the mathematical reasoning stages of TIMSS (2003. The findings suggest that the students use proportional reasoning while solving the problems and use the geometric shapes to facilitate the solution of the problem. When they come across problems related to each other, it is observed that they create connections between the problems based on the results of the previous problem. In conclusion, the students perform crosscheck to ensure that their solutions to the problems are accurate.

  15. La incidencia de las clases particulares en España a través de los datos de PISA

    Directory of Open Access Journals (Sweden)

    Ariadne Runte-Geidel

    2013-01-01

    Full Text Available Investigaciones internacionales han puesto de manifi esto que durante las últimas décadas ha existido una creciente expansión mundial de la utilización de clases de refuerzo educativo por parte de estudiantes de la enseñanza obligatoria. Estas clases ofrecen actividades externas a la escuela que pretenden complementar o ampliar conocimientos. A esta educación «paralela» la denominan internacionalmente Shadow Education, porque acompaña a la educación formal como si fuese su propia sombra. Este artículo analiza la utilización de la educación «en la sombra» por los alumnos de la Enseñanza Secundaria Obligatoria en el contexto español de la última década por medio de la información que proporciona PISA. El objetivo es estimar la proporción de utilización de este tipo de clases en España y averiguar cómo ha progresado este uso en el transcurrir de la última década. Para ello hemos analizado los datos del estudio PISA desde el año 2000 hasta el 2009.International studies about educational tendencies have shown that there has been a remarkable increase in using school reinforcement lessons by students of Compulsory Secondary Education during the last decade. These lessons provide students with a supplement or extension of the knowledge. This type of education is known as Shadow Education, because it accompanies a formal education as if it were its own shadow. This article analyzes the use of Shadow Education by students of Compulsory Secondary Education in the Spanish context of the last decade. We intend to verify in which proportion these kinds of lessons are being used and also the way this has increased recently. In order to carry out this study, we have analyzed data from the PISA report from 2000 to 2009.

  16. Perceived Quality of Educational Technology Matters: A Secondary Analysis of Students' ICT Use, ICT-Related Attitudes, and PISA 2012 Test Scores

    Science.gov (United States)

    Petko, Dominik; Cantieni, Andrea; Prasse, Doreen

    2017-01-01

    In large-scale international assessments such as the Programme for International Student Assessment (PISA), the Trends in International Mathematics and Science Study (TIMSS), or the Progress in International Reading Study (PISA), research has struggled to find positive associations between the frequency of educational technology use in schools and…

  17. PISA - komparativ evaluering i storskalaformat

    DEFF Research Database (Denmark)

    Dolin, Jens

    2008-01-01

    Internationale evalueringer som PISA sætter i stadig højere grad dagsordenen i den uddannelsespolitiske debat og har stor indflydelse på deltagerlandenes uddannelsespolitiske beslutninger. Men berettiger undersøgelserne til den ståhej, de ofte afstedkommer? Artiklen vil gå ind i krydsfeltet melle...

  18. Farewell to a reactor

    International Nuclear Information System (INIS)

    Skanborg, P.

    1976-01-01

    Denmark's second reactor, DR 2, whose first criticality took place the night of 18/19 December 1958 was shut down for the last time on 31 October 1975. It was a light-water moderrated and cooled reactor of swimming-pool type with a thermal power of 5 MW, using 90% enriched uranium. The operation is described. The reactor and auxiliary equipment are now being put 'in store' - all fuel elements sent for reprocessing, the reactor tank and cooling circuits emptied, and a lead shielding placed over the tank opening. The rest of the equipment will remain in place. (B.P.)

  19. Estrategias de aprendizaje implementadas por estudiantes de sexto grado de primaria a partir del uso de computadoras e Internet en un modelo 2:1, como apoyo a los procesos de aprendizaje curricular en Ciencias y Estudios Sociales

    Directory of Open Access Journals (Sweden)

    Catalina Espinoza Ortiz

    2015-01-01

    Full Text Available El propósito de la investigación fue determinar las estrategias de aprendizaje a partir del uso de computadoras XO-01, Classmate PC y Magallanes en un modelo de proporción 2:1 y el uso de Internet, en las materias de Ciencias y Estudios Sociales, por estudiantes de sexto grado de primaria de la escuela León Cortes Castro en San Marcos de Tarrazú en Costa Rica.El estudio se ejecutó con tres grupos de sexto grado de primaria según el sistema educativo costarricense, durante el año 2011. Los datos recolectados corresponden a 70 estudiantes y los 3 docentes de grado correspondientes a cada grupo. Cada uno de los grupos trabajó con tecnologías diferentes, un grupo con XO-01, otro grupo con Classmate PC y el tercero con Classmate Magallanes; todos los grupos utilizando una computadora por cada dos estudiantes (2:1. Para desarrollar la investigación se aplicaron instrumentos a estudiantes y docentes. Ambos instrumentos de tipo cualitativo fueron auto aplicados y bajo anonimato. La información recopilada fue procesada y se aplicó un análisis de tendencias agrupando los datos según las escalas y subescalas desarrolladas en los cuestionarios. Para el proceso de sistematización y análisis se usó como marco de referencia la propuesta de Jesús Beltrán y su definición y categorización de estrategias de aprendizaje.Los resultados señalan que en el grupo de estudiantes se desarrollaron estrategias de sensibilización, elaboración y metacognición. En el caso del grupo docente, la investigación permitió identificar las principales actividades desarrolladas para tratar el contenido del plan de estudios de Ciencias y Estudios Sociales, a saber: resúmenes, cuestionarios y esquemas.

  20. PISA - An Example of the Use and Misuse of Large-Scale Comparative Tests

    DEFF Research Database (Denmark)

    Dolin, Jens

    2007-01-01

    The article will analyse PISA - particularly the part dealing with science - as an example of a major comparative evaluation. PISA will first be described and then analysed on the basis of test theory, which will address some detailed technical aspects of the test as well as the broader issue...

  1. Steering the National: Exploring the Education Policy Uses of PISA in Spain

    Science.gov (United States)

    Engel, Laura C.

    2015-01-01

    This article presents findings from a recent study of the education policy uses and impact of international large-scale assessments, namely the Programme for International Student Assessment (PISA). The paper focuses on two overlapping dimensions of PISA's education policy use in the context of Spain. These include political dimensions, such as…

  2. Australia's Indigenous Students in PISA 2000: Results from an International Study. ACER Research Monograph No. 59

    Science.gov (United States)

    De Bortoli, Lisa; Cresswell, John

    2004-01-01

    In 2000, Australia took part in the inaugural OECD (Organisation for Economic Cooperation and Development) Programme for International Student Assessment (PISA). Approximately 500 Australian Indigenous students were assessed in PISA, providing a representative sample of the 15-year-old Indigenous population. This report presents the analysis of…

  3. Moving beyond Country Rankings in International Assessments: The Case of PISA

    Science.gov (United States)

    Perry, Nancy; Ercikan, Kadriye

    2015-01-01

    The Programme for International Student Assessment (PISA) was designed by the Organization for Economic Cooperation and Development (OECD) to evaluate the quality, equity, and efficiency of school systems around the world. Specifically, the PISA has assessed 15-year-old students' reading, mathematics, and science literacy on a 3-year cycle, since…

  4. Entrenamiento a Profesores de Preescolar y Primer Grado de Primaria, en el Uso de Estrategias de Enseñanza

    Directory of Open Access Journals (Sweden)

    Yolanda Guevara Benítez

    2009-01-01

    Full Text Available La investigación prueba la efectividad de un programa de entrenamiento a profesores de tercer grado de preescolar y primero de primaria, para aplicar una serie de estrategias de enseñanza derivadas de la psicología conductual. Participaron profesoras de escuelas públicas de estrato sociocultural bajo. Antes y después del entrenamiento se filmó una hora de clase de cada profesora, filmaciones que sirvieron para registrar el uso de las estrategias educativas. El entrenamiento consistió en la enseñanza de nueve estrategias que se pueden emplear para optimizar el aprendizaje. En siete participantes se observó un efecto del entrenamiento, durante la pre-evaluación mostraron niveles cercanos a 0% en el uso de la mayoría de las estrategias, para pos-evaluación se observaron incrementos en casi todas ellas. Se analizan posibles efectos del programa sobre el ambiente afectivo y el clima social dentro del aula. Se discuten los resultados con base en hallazgos de investigaciones empíricas previas, analizándose limitaciones del programa y haciéndose sugerencias para estudios y programas futuros.

  5. El Grado de Ruralidad del Empleo Agrario Pampeano a Comienzos del Siglo XXI. Un Análisis Espacial

    Directory of Open Access Journals (Sweden)

    José Luis Pellegrini

    2014-04-01

    Full Text Available En la región pampeana fue usual que la población con ocupación agraria residiera en el campo. Pero en 2001 menos de la mitad lo hacía.  Aquí se muestra que el Grado de Ruralidad del Empleo Agrario varía mucho a través de la región (del 20% al 80% y se ofrece una explicación de su distribución espacial basada en la influencia de factores mesoeconómicos (urbanización, riqueza de la población agraria y tipos de producción sobre la transacción de trabajo. La explicación adopta conceptos y métodos de la Nueva Economía Institucional. Se deducen hipótesis específicas luego evaluadas mediante un análisis econométrico espacial.

  6. A Game of Thrones: Organising and Legitimising Knowledge through PISA Research

    Science.gov (United States)

    Mølstad, Christina E.; Pettersson, Daniel; Forsberg, Eva

    2017-01-01

    This study investigates knowledge structures and scientific communication using bibliometric methods to explore scientific knowledge production and dissemination. The aim is to develop knowledge about this growing field by investigating studies using international large-scale assessment (ILSA) data, with a specific focus on those using Programme…

  7. Comparing Danish and Swedish versions of PISA scientific literacy

    DEFF Research Database (Denmark)

    Serder, Malmø University, Margareta; Sørensen, Helene

    This paper presents a comparison between the Swedish, Danish, English, and French versions of three scientific literacy test-units from the released PISA items 2006. More specifically it compares how different words and concepts have been translated in the Swedish and Danish tests, compared...... to the English and French original versions. Differences that occur as a result of the translation process concerning words’ meaning are demonstrated. The possible consequences of such differences are exemplified by an excerpt from a situation in which Swedish 15-year-old students collaboratively worked...... with these three PISA units. In the paper we claim that in spite of detailed and strongly controlled methods for achieving translations of high standard used by the PISA, important and perhaps even decisive, differences between the four versions exist....

  8. A nuclear power reactor

    International Nuclear Information System (INIS)

    Borrman, B.E.; Broden, P.; Lundin, N.

    1979-12-01

    The invention consists of shock absorbing support beams fastened to the underside of the reactor tank lid of a BWR type reactor, whose purpose is to provide support to the steam separator and dryer unit against accelerations due to earthquakes, without causing undue thermal stresses in the unit due to differential expansion. (J.I.W.)

  9. A quoi servent les enquêtes PISA ? Réflexions sur le cas de la Belgique francophone

    OpenAIRE

    Mangez, Eric; Cattonar, Branka

    2011-01-01

    Cette contribution examine la manière dont les enquêtes PISA ont été reçues et utilisées dans le contexte de la Belgique francophone. La structure de notre analyse est simple : il s’agit d’étudier la rencontre entre un instrument, dépositaire de certaines propriétés, et un contexte, marqué lui aussi par certaines particularités forgées au cours de l’histoire. Après avoir souligné les particularités historiques du contexte politique consociatif belge et la place relativement modeste qu’y occup...

  10. The relevance of the school socioeconomic composition and school proportion of repeaters on grade repetition in Brazil: a multilevel logistic model of PISA 2012

    Directory of Open Access Journals (Sweden)

    Maria Eugénia Ferrão

    2017-02-01

    Full Text Available Abstract The paper extends the literature on grade repetition in Brazil by (a describing and synthesizing the main research findings and contributions since 1940, (b enlarging the understanding of the inequity mechanism in education, and (c providing new findings on the effects of the school socioeconomic composition and school proportion of repeaters on the individual probability of grade repetition. Based on the analyses of empirical distributions and multilevel logistic modelling of PISA 2012 data, the findings indicate that higher student socioeconomic status is associated with lower probability of repetition, there is a cumulative risk of repetition after an early repetition, the school socioeconomic composition is strongly correlated with the school proportion of repeaters, and both are related to the individual probability of repetition. The results suggest the existence of a pattern that cumulatively reinforces the effects of social disadvantage, in which the school plays a central role.

  11. Hvor langt er PISA fra Danmark?

    DEFF Research Database (Denmark)

    Dolin, Jens; Krogh, Lars Brian

    2008-01-01

    PISA 2006 science testen i en dansk kontekst. I det første delprojekt sammenlignes PISA science frameworket med de danske mål for naturfagsuddannelserne. I det andet delprojekt undersøges hvorledes PISA testformatet er i overensstemmelse med evalueringspraksis i naturfagene i den danske folkeskole. I...... det tredje delprojekt sammenlignes elevers score i PISA science testen med deres resultater i en mere dialogbaseret evalueringssituation.   De tre delundersøgelser betjener sig af forskellige metoder, nemlig henholdsvis tekstanalyse, spørgeskemaundersøgelse/ interview samt en egentlig feltvalidering...

  12. INCIDENCE OF VARIABLES NON DIRECTLY CONTROLLABLE BY THE EDUCATIONAL SYSTEM IN STUDENTS’ READING LITERACY IN PISA: A COMPARATIVE STUDY SPAIN-FINLAND

    Directory of Open Access Journals (Sweden)

    Esteban Vázquez Cano

    2014-05-01

    Full Text Available This comparative research between Spain and Finland examines the incidence of eight variables of PISA (2012 typologically grouped in three areas: family, internet use for reading activities, and availability of books at home in students’ results in reading literacy. Through a descriptive and quantitative methodology, we analyze the incidence of these eight variables in Finnish and Spanish students’ reading literacy. The results show that parents’ academic and professional level along with the type of book that is available at home are non-significant variables in the development of a high reading literacy; by contrast, the variable that measures Internet use at home for reading news has been highly significant. Finnish students duplicate the Spanish in this variable which increases in 30 points reading literacy results.

  13. A study of copper precipitation in the thermally aged FeCu alloy using SANS

    Energy Technology Data Exchange (ETDEWEB)

    Park, D. G.; Kim, J. H.; Kwon, S. C.; Kim, W. W. [Korea Atomic Energy Research Institute, Taejon (Korea, Republic of); Lee, M. N.; Koo, Y. M. [Pohang University of Science and Technology, Pohang (Korea, Republic of)

    2005-07-01

    The continued operation or lifetime extension of a number of nuclear power plant around the world requires an understanding of the damage imparted to the reactor pressure vessel (RPV) steel by radiation. Irradiation embrittlement of nuclear reactor pressure vessel steels results from a high number of nanometer sized Cu rich precipitates (CRPs) and sub-nanometer defect-solute clusters. The copper precipitation leads to a distortion of the crystal lattice surrounding the copper precipitates and yields an internal micro-stress. In order to study the effect of copper precipitation on the steel embrittlement under neutron irradiation, the characteristics of nano size defects were investigated using small angle neutron scattering (SANS) in the thermal aged FeCu model alloys. The results on the precipitation composition, number density, size distribution and matrix composition obtained using a high resolution TEM and SANS are compared and contrasted.

  14. en el grado de turismo

    Directory of Open Access Journals (Sweden)

    Mª del Carmen Mínguez García

    2014-01-01

    Full Text Available En el contexto de la revolución tecnológica e informacional, resultado de la globalización económica y social, el turismo es uno de los sectores que más rápidamente ha incorporado los avances tecnológicos en la adecuación del territorio. Por ello es preciso tener un conocimiento de las realidades asociadas a la creación del espacio turístico y a sus procesos de transformación, siendo clave, en el ámbito educativo y en el técnico-profesional, el trabajo del geógrafo. La apuesta por la profesionalización y la calidad del sector turístico español se materializó con la aprobación del Grado Universitario en Turismo, cuyo programa refleja la importancia del conocimiento del medio con numerosas asignaturas. La juventud del grado ha demostrado la necesidad de recursos didácticos específicos para su enseñanza, por ello se planteó el proyecto BIG-Turismo, que consiste en la creación de un banco de imágenes propio, enriquecido con materiales complementarios. Su objetivo es convertirse en una fuente de consulta de referencia para la Geografía del Turismo. Para ello los materiales generados están disponibles online, a través de una SIGWeb creada con la plataforma ArcGIS Online y una página Web, que permiten un trabajo activo entre profesores y estudiantes, favoreciendo la búsqueda de información, la diversificación de actividades y el desarrollo de habilidades y capacidades.

  15. Cervecería Artesanal, Mela`s Craft Beer : trabajo de Grado en emprendimiento

    OpenAIRE

    Manotas, Eduardo Alejandro

    2017-01-01

    En Colombia, el consumo de cerveza viene creciendo a pasos agigantados, nada más en los últimos 4 años pasamos de ser el octavo país en consumo per cápita de cerveza en Latinoamérica con 45 Litros a ser el tercero con un consumo de 58Lt. Al año. EL crecimiento de Bavaria se ha sostenido alrededor de los 18 puntos porcentuales y el de la cerveza artesanal esta aproximadamente en un 40% año a año. Mela´s Craft Beer nace bajo la necesidad de traer al país cerveza de calidad mundial como no ex...

  16. Actitudes ante la muerte en estudiantes de grado de enfermería

    OpenAIRE

    González Cervantes, Sergio

    2015-01-01

    Por todos es conocida la importancia y necesidad del soporte emocional al enfermo moribundo, si bien, es tanto o más importante la preparación emocional del personal sanitario que está día aa trabajando al lado de la muerte. En este sentido, es sabido que la vivencia del proceso de morir genera un amplio abanico de actitudes y respuestas emocionales que se han de tener en cuenta en el momento de preparar al personal sanitario, siendo las más frecuentes la ansiedad y el miedo. Teniendo pres...

  17. Condiciones laborales y grado de satisfacción de profesionales de enfermería

    Directory of Open Access Journals (Sweden)

    Giomar Herrera-Amaya

    2008-01-01

    Conclusiones: la remuneración guarda relación con la insatisfacción, la estabilidad laboral mejora la sensación de satisfacción intrínseca. La mayoría de las investigaciones indican que el aumento de la edad y los años de ejercicio profesional incrementan la satisfacción laboral, situación contraria en nuestro estudio.

  18. La etnografía: una alternativa de titulación de grado

    Directory of Open Access Journals (Sweden)

    Valencia-Medina, Elvia

    2016-08-01

    Full Text Available This paper aims to critically analyze the relevance of ethnography as an alternative work for degree qualification, which is referred to in the Regulation of the Academic Regime 2013, issued by the Higher Education Council, CES. The selection of ethnography as a method of research work will enable students to strengthen the research skills and develop their skills in real contexts of community service. The proposal has been preceded by experiences of qualitative research that were conducted in Institutional Academic Projects in vulnerable sectors of Milagro city, Ecuador, in 2012 and 2013. In that draft some techniques were applied such as participant observation, informal interview, and document analysis, these techniques go hand in hand with ethnography. The main purpose was to establish the causes of the low participation of people and their level of involvement in the educational process of their children, linked to a need to influence the improvement of the educational quality and quality of life. With research expertise and knowledge of the legal framework, it is expected to demonstrate the feasibility of intervention ethnography in socio-educational problems and the possible use as an alternative for Degree qualification in Education

  19. Reactor coolant pump for a nuclear reactor

    International Nuclear Information System (INIS)

    Burkhardt, W.; Richter, G.

    1976-01-01

    An improvement is proposed concerning the easier disengagement of the coupling at the reactor coolant pump for a nuclear reactor transporting a pressurized coolant. According to the invention the disengaging coupling consists of two parts separated by screws. At least one of the screws contains a propellent charge ananged within a bore and provided with a speed-dependent ignition device in such a way that by separation of the screws at overspeeds the coupling is disengaged. The sub-claims are concerned with the kind of ignition ot the propellent charge. (UWI) [de

  20. Reactor building for a nuclear reactor

    International Nuclear Information System (INIS)

    Haidlen, F.

    1976-01-01

    The invention concerns the improvement of the design of a liner, supported by a latticed steel girder structure and destined for guaranteeing a gastight closure for the plant compartments in the reactor building of a pressurized water reactor. It is intended to provide the steel girder structure on their top side with grates, being suited for walking upon, and to hang on their lower side diaphragms in modular construction as a liner. At the edges they may be sealed with bellows in order to avoid thermal stresses. The steel girder structure may at the same time serve as supports for parts of the steam pipe. (RW) [de

  1. PREFACE: SANS-YuMO User Meeting at the Start-up of Scientific Experiments on the IBR-2M Reactor: Devoted to the 75th anniversary of Yu M Ostanevich's birth

    Science.gov (United States)

    Gordely, Valentin; Kuklin, Alexander; Balasoiu, Maria

    2012-03-01

    The Second International Workshop 'SANS-YuMO User Meeting at the Start-up of Scientific Experiments on the IBR-2M Reactor', devoted to the 75th anniversary of the birth of Professor Yu M Ostanevich (1936-1992), an outstanding neutron physicist and the founder of small-angle neutron scattering (field, group, and instrument) at JINR FLNPh, was held on 27-30 May at the Frank Laboratory of Neutron Physics. The first Workshop was held in October 2006. Research groups from different neutron centers, universities and research institutes across Europe presented more than 35 oral and poster presentations describing scientific and methodological results. Most of them were obtained with the help of the YuMO instrument before the IBR-2 shutdown in 2006. For the last four years the IBR-2 reactor has been shut down for refurbishment. At the end of 2010 the physical launch of the IBR-2M reactor was finally realized. Nowadays the small-angle neutron scattering (SANS) technique is applied to a wide range of scientific problems in condensed matter, soft condensed matter, biology and nanotechnology, and despite the fact that there are currently over 30 SANS instruments in operation worldwide at both reactor and spallation sources, the demand for beam-time is considerably higher than the time available. It must be remembered, however, that as the first SANS machine on a steady-state reactor was constructed at the Institute Laue Langevin, Grenoble, the first SANS instrument on a 'white' neutron pulsed beam was accomplished at the Joint Institute for Nuclear Research at the IBR-30 reactor, beamline N5. During the meeting Yu M Ostanevich's determinative and crucial contribution to the construction of spectrometers at the IBR-2 high-pulsed reactor was presented, as well as his contribution to the development of the time-of-flight (TOF) small-angle scattering technique, and a selection of other scientific areas. His leadership and outstanding scientific achievements in applications of the

  2. TIMSS and PISA Impact--The Case of Jordan

    Science.gov (United States)

    Ababneh, Emad; Al-Tweissi, Ahmad; Abulibdeh, Khattab

    2016-01-01

    Jordan has participated in international large-scale assessments (LSAs) since 1991 and in most of the Trends in International Mathematics and Science Studies (TIMSS) as well as the Programme for International Student Assessments (PISA). After a short description of education system and policy-making context in the country, this article provides an…

  3. Desigualdades territoriales en España e Italia : nuevas evidencias a partir de la evaluación PISA-2009

    Directory of Open Access Journals (Sweden)

    Luisa Donato

    2012-01-01

    Full Text Available El artículo investiga los factores de desarrollo territorial y de gestión del sistema educativo que explican las desigualdades educativas de los estudiantes entre las regiones italianas y entre las comunidades autónomas españolas. A partir de la base de datos OCDE PISA 2009 y de la imputación de indicadores agregados a nivel regional, se han elaborado modelos de regresión multinivel para estimar los efectos. Los resultados muestran como ambos países comparten un patrón similar en términos de diferenciación territorial en materia de eficacia educativa. No obstante, las diferencias se explican por motivos distintos. Mientras que en Italia las regiones que más riqueza agregada tienen son las que obtienen mejores resultados, en España el margen para gestionar regionalmente las competencias permite a algunas comunidades con un menor nivel de riqueza focalizar sus políticas para compensar los desajustes debidos a la composición socioeconómica del territorio. Entre otros factores, cabe destacar la importancia de la inversión pública en educación y de los niveles de segregación social de los centros educativos como factores que explican las diferencias territorialesThis paper investigates regional factors of economic development and education system management, which explain educational inequalities between Italian regions, and between Spanish autonomous communities. Using the OECD PISA 2009 database and imputed regional indicators, multilevel regression models have been developed to estimate the effects. Results show that both countries share a similar pattern of territorial differentiation on educational effectiveness. Yet, differences are explained by different reasons. While in Italy wealthiest regions perform better, in Spain the margin given to regions to manage local education system enables certain communities with lower levels of wealth to compensate for mismatches due to socioeconomic composition of the region. Among others

  4. Scientific Literacy and Student Attitudes: Perspectives from PISA 2006 science

    Science.gov (United States)

    Bybee, Rodger; McCrae, Barry

    2011-01-01

    International assessments provide important knowledge about science education and help inform decisions about policies, programmes, and practices in participating countries. In 2006, science was the primary domain for the Programme for International Student Assessment (PISA), supported by the Organisation for Economic Cooperation and Development (OECD) and conducted by the Australian Council for Educational Research (ACER). Compared to the school curriculum orientation of Trends in International Math and Science Study (TIMSS), PISA provides a perspective that emphasises the application of knowledge to science and technology-related life situations. The orientation of PISA includes both knowledge and attitudes as these contribute to students' competencies that are central to scientific literacy. In addition to students' knowledge and competencies, the 2006 PISA survey gathered data on students' interest in science, support for scientific enquiry, and responsibility towards resources and environments. The survey used both a non-contextualised student questionnaire and contextualised questions. The latter is an innovative approach which embedded attitudinal questions at the conclusion of about two-thirds of the test units. The results presented in this article make connections between students' attitudes and interests in science and scientific literacy.

  5. A multi-purpose reactor

    International Nuclear Information System (INIS)

    Changwen Ma

    2000-01-01

    An integrated natural circulation self pressurized reactor can be used for sea water desalination, electrogeneration, ship propulsion and district or process heating. The reactor can be used for ship propulsion because it has following advantages: it is a integrated reactor. Whole primary loop is included in a size limited pressure vessel. For a 200 MW reactor the diameter of the pressure vessel is about 5 m. It is convenient to arranged on a ship. Hydraulic driving facility of control rods is used on the reactor. It notably decreases the height of the reactor. For ship propulsion, smaller diameter and smaller height are important. Besides these, the operation reliability of the reactor is high enough, because there is no rotational machine (for example, circulating pump) in safety systems. Reactor systems are simple. There are no emergency water injection system and boron concentration regulating system. These features for ship propulsion reactor are valuable. Design of the reactor is based on existing demonstration district heating reactor design. The mechanic design principles are the same. But boiling is introduced in the reactor core. Several variants to use the reactor as a movable seawater desalination plant are presented in the paper. When the sea water desalination plant is working to produce fresh water, the reactor can supply electricity at the same time to the local electricity network. Some analyses for comprehensive application of the reactor have been done. Main features and parameters of the small (Thermopower 200 MW) reactor are given in the paper. (author)

  6. Influencia del fenómeno ENOS (El Niño y La Niña) en la disponibilidad de grados-día

    OpenAIRE

    Lozada García, Beatriz; Prela, Angélica; Sentelhas, Paulo

    2004-01-01

    Se evaluó la influencia del fenómeno ENOS (El Niño y La Niña) sobre la disponibilidad de calor, en 8 localidades, ubicadas en la región centro-occidental de Venezuela, utilizando concepto de grados-día (GD). Los cambios de la temperatura, representados por las variaciones en los GD, afectarían directamente el ciclo fenológico los cultivos, generando un incremento o reducción en función de desvíos positivos o negativos, respectivamente. Los GD estimados fueron agrupados según el evento predomi...

  7. The Development of a PiSA Module for a Diagnosis of Instrumental Signals Associated with an ASSA Module for Accident Controls

    International Nuclear Information System (INIS)

    Koo, Kil Mo; Ahn, Kwang Il

    2010-05-01

    A review of a plant's accident management capabilities is one of the key elements in achieving regulatory closure of severe accident issues. During accidents, information and data from plant's instruments, as well as others sources, are essential for assessing the plant's status and response. Unlike for design basis accidents, there are inherently some uncertainties to instrumentation capabilities for severe accident conditions. There are many ways to obtain information during a severe accident. Moreover, precise measurements are not necessary. The redundancy and ruggedness of a plant's instrumentation provides considerable depth in the capability of existing designs. The circuit simulation analysis and diagnosis methods are used to assess instruments in detail when they give apparently abnormal readings. A new simulator, PiSA(Provability Instrument Signal Analysis) associated with ASSA(Abnormal Signal Simulation Analysis), through an analysis of the important circuits modeling under severe accident conditions has been designed. It has three main functions which are a signal processing tool, an accident management tool, and an additional guide from the initial screen. In this report, it can be simulated to the temperature characteristic analysis procedure of the PiSA including ASSA's data comparative methods and using specific signal processing under severe accident condition

  8. Grado de información de los pacientes remitidos a un servicio de oncología radioterápica

    Directory of Open Access Journals (Sweden)

    C. RODRÍGUEZ TERRÍN

    2002-01-01

    Full Text Available En España, la información sobre el diagnóstico de cáncer no está claramente estipulada. Los objetivos de este estudio son: 1 averiguar el nivel de información de los pacientes remitidos a nuestro servicio, 2 conocer las características del paciente relacionadas con su grado de información y 3 determinar la evolución con respecto a este tema. Entre Mayo-Noviembre de 1999, se incluyeron consecutivamente 116 pacientes que cumplimentaron un breve formulario en el momento de su llegada a nuestro servicio. Sólo un 48.3% habían sido informados de su diagnóstico correctamente. Las características de los pacientes con mayor grado de información son: el sexo femenino (p= 0.00024, la edad menor de 58 años (p=0.00006 y el padecer un cáncer mamario-ginecológico (p=0.00003. Los pacientes oncológicos tienen una información incompleta sobre su diagnóstico. Las características sociodemográficas y el tipo de cáncer afectan a la información. Las habilidades de comunicación y la empatía son instrumentos necesarios en la relación médico-paciente.

  9. Method of operating a reactor

    International Nuclear Information System (INIS)

    Oosumi, Katsumi; Yamamoto, Michiyoshi.

    1980-01-01

    Purpose: To prevent stress corrosion cracking in the structural material of a reactor pressure vessel. Method: Prior to the starting of a reactor, the reactor pressure vessel is evacuated to carry out degassing of reactor water, and, at the same time, reactor water is heated. After reactor water is heated to a predetermined temperature, control rods are extracted to start nuclear heating. While the temperature of the reactor water is in a temperature range where elution of a metal which is a structural material of the reactor pressure vessel becomes vigorous and the sensitivity to the stress corrosion cracks increases, the reactor is operated at the maximum permissible temperature raising speed or maximum permissible cooling speed. (Aizawa, K.)

  10. La Geografía en las enseñanzas universitarias de Grado en España: docencia y planes de estudios

    Directory of Open Access Journals (Sweden)

    Luis Carlos Martínez Fernández

    2017-01-01

    Full Text Available La adaptación del sistema universitario español al Espacio Europeo de Educación Superior [EEES] ha supuesto una nueva organización de las enseñanzas superiores en nuestro país. En este contexto, el artículo detalla la presencia de la Geografía en los diferentes planes de estudios de Grado existentes, en los propios de Geografía y Ordenación del Territorio, como denominación más frecuente, y en otros Grados de las distintas ramas de conocimiento en que se agrupan los grandes campos del saber: Artes y Humanidades, Ciencias Sociales y Jurídicas, Ciencias e Ingeniería y Arquitectura. Mención aparte, por la larga vinculación establecida, merece la docencia de Geografía en las Escuelas de Magisterio, ahora trans - formadas en Facultades de Educación.

  11. Advanced reactors: A retrospective

    International Nuclear Information System (INIS)

    Starr, C.

    1989-01-01

    The objectives for nuclear power have always emphasized competitive costs, reliability, and public safety. During its initial two decades, the nuclear reactor program was enthusiastically and generously supported by the public, government, and industry. In the subsequent decades this external support was substantially eroded by the growing public fears of catastrophic accidents, poor economic performance of many nuclear plants, regulatory constraints, and a plethora of engineering issues disclosed by plant operations. The technical and institutional histories are discussed with particular relevance to their influence on the framework for future development of the several proposed advance reactors

  12. Interculturalidad y grado de adopción del cultivo del cacao en el distrito de Santa María de Nieva, Condorcanqui, Amazonas, Perú

    OpenAIRE

    Almestar Montenegro, José Salomón

    2015-01-01

    Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Innovación Agraria para el Desarrollo Rural El objetivo general de esta investigación fue analizar el efecto de los factores sociales y culturales en el grado de adopción de cacao entre productores agrícolas del distrito de Santa María de Nieva, en la provincia de Condorcanqui, en la región Amazonas. La investigación se llevó a cabo en cuatro comunidades Awajún (Santa Rosa de Pagkintsa, Tayuntsa, Putuyacat y Najain Pa...

  13. Activación de arcillas de bajo grado a altas temperaturas Activation of low grade clays at high temperatures

    Directory of Open Access Journals (Sweden)

    Rancés Castillo

    2010-01-01

    Full Text Available Se presenta una propuesta de producción de puzolanas artificiales a partir de activar arcillas de baja pureza, como alternativa de producción de Metacaolín. Se trabajó básicamente con tierra rica en minerales arcillosos, principalmente caolín. Este material fue sedimentado y luego calcinado a 900 grados Celsius. Igual proceso se realizó al material original sin sedimentar. Producto de la calcinación disminuyó considerablemente la superficie específica, y por ende la actividad puzolánica, que fue evaluada monitoreando el consumo de HC en pastas a varias edades, y la resistencia a compresión en morteros. El material calcinado, aparentemente inerte, fue molido hasta una alta finura. Se introdujo una serie experimental con ceniza de paja de caña, como referencia de puzolana anteriormente estudiada. Las arcillas calcinadas molidas incrementaron cuantiosamente su actividad puzolánica, caracterizado por un mayor consumo de HC en pastas, y una mayor resistencia a compresión en morteros. Aparentemente este cambio se debe al efecto del molido sobre la reactividad de los suelos arcillosos calcinados. Los mejores resultados se obtuvieron para las muestras sedimentadas antes de calcinar. La resistencia a compresión de morteros, sustituyendo un 30% del peso de cemento por dicho material, es similar al control (100% cemento a 7 días, y mayor a 28 y 60 días. Aunque dicha sustitución no disminuye la porosidad total, se disminuye la sorptividad, principalmente en muestras producidas con material sedimentado calcinado y molido. Posiblemente este fenómeno ocurra por un proceso de refinación de poros capilares inducido por la precipitación de productos de la reacción puzolánica.This paper introduces a proposal to produce artificial pozzolans by means of activation of low grade clays, as an alternative to metakaolin production. Basically the work considered clay mineral enriched soils, mainly kaolin. Such material was sediment and later

  14. PISA and TIMSS Science Score, Which Clock Is More Accurate to Indicate National Science and Technology Competitiveness?

    Science.gov (United States)

    Shi, Wei-Zhao; He, Xiqin; Wang, Yan; Fan, Zeng-Guang; Guo, Liangdong

    2016-01-01

    In 2015, PISA and TIMSS are coming up to us together. In this study, the data from PISA and TIMSS are used to investigate that which one is a better indicator of national science and technology (S&T) competitiveness? Number of S & T journal articles (per million people) is used as a measure to represent the national S&T…

  15. Reacción a la tuberculina entre escolares de noveno grado de Ciudad de La Habana, Cuba

    Directory of Open Access Journals (Sweden)

    Borroto Gutiérrez Susana M.

    2003-01-01

    Full Text Available OBJETIVOS: Determinar la proporción de personas que reaccionan a la tuberculina como indicador de la prevalencia de infección tuberculosa en escolares de 14 años de Ciudad de La Habana, Cuba. MÉTODOS: Mediante un muestreo monoetápico por conglomerados se aplicaron 1 936 pruebas de Mantoux (tuberculina a estudiantes de noveno grado del curso escolar 1999-2000 (cohorte de los nacidos en 1985 de 20 escuelas secundarias básicas seleccionadas aleatoriamente en Ciudad de La Habana, Cuba. Las pruebas se realizaron según la técnica estándar recomendada por la Organización Mundial de la Salud y se evaluaron a las 72 horas. Se calcularon los porcentajes de reactividad y el diámetro medio de las induraciones cutáneas en la cohorte y según el sexo. Las comparaciones de medias y porcentajes se realizaron mediante la prueba de ji al cuadrado con 95% de confiabilidad. Se usó el programa Epi Info v. 6.0. RESULTADOS: Noventa y seis por ciento de las pruebas leídas fueron negativas (0-4 mm, 2,5% fueron dudosas (5-9 mm y 1,5% resultaron positivas (> 10 mm. El porcentaje de reactividad disminuyó a 0,1% cuando se utilizó un valor de corte de 15 mm. El diámetro medio de las induraciones fue de 0,41 mm y no se detectó ninguna diferencia estadísticamente significativa en función del sexo. CONCLUSIONES: La proporción de personas que reaccionaron a la tuberculina, usando como punto de corte un diámetro de induración cutánea de 10 mm, fue muy baja (1,5% en este estudio y mucho más baja (0,1% cuando se utilizó 15 mm como punto de corte. Si se toma en cuenta la baja frecuencia de tuberculosis bacilífera en Cuba y que hay una relación inversa entre el tiempo transcurrido desde la aplicación de la vacuna a base del bacilo de Calmette-Guérin (BCG y la intensidad de la respuesta a la tuberculina, las reacciones cutáneas con un diámetro de induración > 10 mm podrían ser la expresión de una infección natural, por lo que, en ese caso, la

  16. Diseño de una formulación de ciclosporina A solución oral con alto grado de dispersión

    Directory of Open Access Journals (Sweden)

    Suslebys Salomón Izquierdo

    2013-03-01

    Full Text Available La ciclosporina A (CsA por sus propiedades inmunosupresoras es empleada en el transplante de órganos sólidos, médula ósea, así como para determinados estadíos de ciertas enfermedades autoinmunes. En Cuba, se comercializa una solución oral que presenta problemas de absorción gastrointestinal. Objetivos: lograr una microemulsión preconcentrada conteniendo ciclosporina A con alto grado de dispersión, igual o mayor que la formulación comercial. Métodos: se realizó un estudio de porcentajes de los emulgentes y el balance hidrófilo lipófilo (HLB, en los intervalos que permitieran obtener sistemas automicroemulsionables a través de un diseño factorial multinivel. Se empleó el porciento de transmitancia como variable de respuesta en la determinación del grado de dispersión de la formulación. También se realizó la evaluación de las características organolépticas de la formulación seleccionada, el estudio reológico, el conteo microbiano y la efectividad antimicrobiana. Resultados: los factores estudiados tienen influencia significativa sobre el porcentaje de transmitancia, la formulación con mayor grado de dispersión se logró empleando un 60 % de emulgentes junto a un HLB de 11,5 con valores de transmitancia de 95,03 %, significativamente mayor que el del producto líder en formato de cápsulas blandas que fue de 84,6 %. Organolépticamente el producto cumple con las características de líquido transparente, brillante y sin partículas en suspensión, con comportamiento Newtoniano desde el punto de vista reológico. El conteo de bacterias y hongos cumplió con los requisitos establecidos en la Farmacopea de los Estados Unidos para soluciones orales. Conclusiones: se logró una microemulsión preconcentrada de CsA en solución bebible con alto grado de dispersión, cumpliendo con los requisitos físicos y microbiológicos establecidos para este tipo de forma farmacéutica.

  17. Searching for Authentic Context in Designing PISA-like Mathematics Problem: From Indoor to Outdoor Field Experience

    Science.gov (United States)

    Siswono, T. Y. E.; Kohar, A. W.; Rosyidi, A. H.; Hartono, S.; Masriyah

    2018-01-01

    Designing problem like in PISA is known as a challenging activity for teachers particularly as the use of authentic context within that type of problem. This paper aims to describe the experiences of secondary mathematics teachers in designing PISA-like problems within an innovative training program focusing on building teachers’ understanding on the concept of mathematical literacy. The teachers were engaged in a set of problem-solving and problem-posing activities using PISA-based problem within indoor and outdoor field experiences. Within indoor field experience, the teachers worked collaboratively in groups on designing PISA-like problems with a given context through problem generation and reformulation techniques. Within outdoor field experience, they worked on designing PISA-like problems with self-chosen context from the place where the outdoor field experience took place. Our analysis indicates that there were improvements on the PISA-like problems designed by teachers based on its level use of context from indoor to outdoor experience. Also, the teachers were relatively successful with creating appropriate and motivating contexts by harnessing a variety of context consisting of personal, occupational, societal, and scientific contexts. However, they still experienced difficulties in turning these contexts into an appropriate problem satisfying PISA framework such as regarding authenticity of context use, language structure, and PISA task profile.

  18. What Do We Really Learn from PISA? The Sociology of Its Reception in Three European Countries (2001-2008)

    Science.gov (United States)

    Pons, Xavier

    2011-01-01

    This article synthesises some findings of an international research project called "Know&Pol" to question the effects of the OECD's Programme for International Student Assessment (PISA) on the public debate in three European countries (France, Portugal and Scotland). Using a political science approach, it shows that Pisa did not…

  19. Co-Producing Sustainability: Involving Parents and Civil Society in the Governance of School Meal Services. A Case Study from Pisa, Italy

    Directory of Open Access Journals (Sweden)

    Francesca Galli

    2014-03-01

    Full Text Available There is a rising awareness of the power of the public sector in enhancing sustainable consumption and production practices, in particular related to food procurement and its social, ethical, economical and environmental implications. School meal services have a high resonance in the debate on collective catering services because of the implications on the education to sustainable dietary habits and the orientation of the production system. This contribution focuses on the reciprocal relationship between professionals and users of school meal services as a driver to mobilize new resources—according to the theory of co-production—that steer service innovation and a shift towards more sustainable practices. We illustrate this through a case study on the school meal system in Pisa (Italy, where the Canteen Committee represents an institutional arena for participation and empowerment of actors that has gradually gained a central role in shaping this school meal service. Despite the challenges and obstacles, the institutionalized co-production of services allows consolidation of trust among key players and the introduction of innovations in the service, in the form of several projects oriented to sustainability which would not take place without the joint effort of actors involved, parents in the first place.

  20. Estudio de variables determinantes de eficiencia a través de los modelos jerárquicos lineales en la evaluación PISA 2006: el caso de España. Study of the determinants of efficiency applying Hierarchical Linear Models in the assessment PISA 2006: the case of Spain

    Directory of Open Access Journals (Sweden)

    Esther López Martín

    2009-08-01

    Full Text Available Este trabajo relaciona el rendimiento obtenido por los alumnos españoles en la evaluación PISA 2006 con variables del entorno del estudiante y del centro que están asociadas a la función básica de producción educativa (Hanushek, 1989 y, por lo tanto, a la eficiencia del sistema educativo. El análisis se ha llevado a cabo mediante la técnica de análisis multinivel, ya que permite el estudio adecuado de estructuras de datos anidados, como ocurre en el caso de datos educativos. A la luz de los resultados obtenidos es posible evidenciar una relación entre las diferentes variables de recursos, tanto de alumno (por ejemplo recursos educativos, posesiones culturales en casa como de centro (titularidad o número de ordenadores por alumno, entre otras con el rendimiento académico. This paper connects Spanish students performance in science in PISA 2006 with indicators of students, teachers and institutions associated to the educational production function (Hanushek, 1989 and, consequently, with the efficiency of the educational system. The analysis has been carried out by means of multilevel analysis; this technique is appropriate for the study of hierarchical data structures, as is the case for educational information. In light of the information provided it is possible to demonstrate a relationship between resources variables, both in the student's level (for example educational resources, cultural possessions in home and at the school level (for example ownership, computers with the academic performance.

  1. PSInSAR Analysis in the Pisa Urban Area (Italy: A Case Study of Subsidence Related to Stratigraphical Factors and Urbanization

    Directory of Open Access Journals (Sweden)

    Lorenzo Solari

    2016-02-01

    Full Text Available Permanent Scatterer Interferometry (PSI has been used to detect and characterize the subsidence of the Pisa urban area, which extends for 33 km2 within the Arno coastal plain (Tuscany, Italy. Two SAR (Synthetic Aperture Radar datasets, covering the time period from 1992 to 2010, were used to quantify the ground subsidence and its temporal evolution. A geotechnical borehole database was also used to make a correspondence with the detected displacements. Finally, the results of the SAR data analysis were contrasted with the urban development of the eastern part of the city in the time period from 1978 to 2013. ERS 1/2 (European Remote-Sensing Satellite and Envisat SAR data, processed with the PSInSAR (Permanent Scatterer InSAR algorithm, show that the investigated area is divided in two main sectors: the southwestern part, with null or very small subsidence rates (<2 mm/year, and the eastern portion which shows a general lowering with maximum deformation rates of 5 mm/year. This second area includes deformation rates higher than 15 mm/year, corresponding to small groups of buildings. The case studies in the eastern sector of the urban area have demonstrated the direct correlation between the age of construction of buildings and the registered subsidence rates, showing the importance of urbanization as an accelerating factor for the ground consolidation process.

  2. Evaluación de competencias matemáticas: proyecto PISA/OCDE 2003

    OpenAIRE

    Rico, Luis

    2004-01-01

    Las ideas que aquí se presentan son un resumen e interpretación de las publicadas en el capítulo Mathematics Literacy, incluido en el documento editado en 2003 por la OCDE The PISA 2003 Assessment Framework y aparecen en el documento Aproximación a un modelo de evaluación: el proyecto PISA 2000, que ha sido publicado por el Ministerio de Educación, Cultura y Deportes.

  3. Description of the structural evolution of a hydrating portland cement paste by SANS

    International Nuclear Information System (INIS)

    Haeussler, F.; Eichhorn, F.; Baumbach, H.

    1994-01-01

    On the spectrometer MURN at the pulsed reactor IBR-2 dry Portland cement, silica fume, and a hydrating Portland cement paste were studied by small-angle neutron scattering (SANS). By using the TOF-method a momentum transfer from 0.07 nm -1 to 7 nm -1 is detectable. Every component (dry cement powder, clinker minerals, hydrating cement pastes) shows a different scattering behaviour. In the measured Q-region the hardening cement paste does not show a Porod-like behaviour of SANS-curves. In contrast the Porod's potential law holds for dry powder samples of clinker minerals and silica fume. In experiments carried out to observe the hydration progress within the first 321 days the characteristics of the scattering curves (potential behaviour, the radius of gyration, and the macroscopic scattering cross section at Q = 0 nm -1 were measured. Some evolution of the inner structure of the hardened cement paste was noted. (orig.)

  4. PISA Performance and Australian Education : myths and realities

    Directory of Open Access Journals (Sweden)

    Anthony Welch

    2011-10-01

    Full Text Available Australia's record as one of the higher performing nations on therecent PISA tests occasioned more interest internationally than domestically. Not with standing this success however, it is argued that its overall national success on the PISA tests is something of a myth, masking wide differences between the overall majority, and certain disadvantaged minorities. Disaggregating the performance data reveals the actual situation with respect to indigenous Australians, certain ethnic minorities and the effects of social class, which in each case is complemented with analysis of test performance differentials from PISA and NAPLAN. This examination reveals the reality that Australia is less successful than several other countries in extending high levels of school performance to key minorities. Given this failure, the myth of Australian high performance needs to be re-examined: much more needs to be done to boost the educational success of disadvantaged minorities.Los resultados de Australia, como uno de los países como uno de los países con los mejores resultados en el reciente estudio PISA han interesado más fuera de sus fronteras que dentro de ellas. A pesar de este éxito, sin embargo, se argumenta que los buenos resultados nacionales en los test de PISA encierran algo de mito y enmascara amplias diferencias entre la inmensa mayoría y ciertas minorías desaventajadas. Realizando un examen desagregado de los datos de Australia se pone de manifiesto la situación actual respecto a los indígenas de ese continente, ciertas minorías étnicas y el efecto de la clase social que se complementa en cada caso con el análisis de los diferenciales de rendimiento entre PISA y NAPLAN. El examen revela que Australia en realidad es menos exitosa que algunos de otros países a la hora de extender elevados niveles de rendimiento escolar a determinadas minorías clave. Ante este fracaso, el mito del alto rendimiento australiano necesita ser revisado: es

  5. Validación de instrumentos para la evaluación formativa de la biología en estudiantes de grado sexto

    Directory of Open Access Journals (Sweden)

    Salin Polania Polo

    2015-12-01

    Full Text Available Este artículo recoge la experiencia de validación de los instrumentos que se utilizarán para la evaluación desde el enfoque formativo en la enseñanza de la biología en estudiantes de grado sexto del Colegio Integrado de Fontibón de acuerdo a las categorías establecidas en el trabajo de investigación. Parte desde el concepto de evaluación y su enfoque formativo para los aprendizajes, lo que promueve en el profesor acciones de enseñanza dirigidas hacia sus estudiantes encaminadas a un diálogo permanente entre estos actores favoreciendo el aprendizaje desde la retroalimentación y la contextualización de las temáticas. Para ello se revisaron distintos autores que fundamentan la evaluación formativa y determinan las condiciones que caracterizan los instrumentos evaluativos adecuados para el enfoque formativo, los cuales se ajustan a un programa de intervención en la asignatura de biología de acuerdo al plan de estudios para grado sexto. Palabras claves: Evaluación formativa, instrumentos de evaluación, enseñanza de la biología, validación instrumentos.

  6. El lenguaje como factor de desigualdad en los aprendizajes en Pisa 2009: el caso de la frontera noreste de Uruguay con Brasil = Language as an inequality factor in learning in Pisa 2009: a case study at the boundary between Uruguay and Brazil

    Directory of Open Access Journals (Sweden)

    Fernández Aguerre, Tabaré

    2016-01-01

    Full Text Available The Uruguayan borderline with Brazil has historically been identified as a region with the worst socioeconomic indicators of the country. On the other side, Uruguayan borderline with Brazil is a bilingual region, with a categorized situation of diglossia from the earliest linguistic studies. This makes us wonder if differences on educational results are related with the use of “portuñol” on behalf of the Uruguayan borderline students. The aim of this research is to analyze the isolated effect of being a “portuñol” speaker and live in the borderline, over a standard model of educational inequality (social class, gender, type of educational institution. In order to achieve this we generated a Hierarchical Linear Model in two levels: students and schools, adding to the classical educational determinants linguistic factors, using microdata of Pisa 2009. The results allow us to confirm the hypothesis of a linguistic inequality on an individual level

  7. Decommissioning a nuclear reactor

    International Nuclear Information System (INIS)

    Montoya, G.M.

    1991-01-01

    The process of decommissioning a facility such as a nuclear reactor or reprocessing plant presents many waste management options and concerns. Waste minimization is a primary consideration, along with protecting a personnel and the environment. Waste management is complicated in that both radioactive and chemical hazardous wastes must be dealt with. This paper presents the general decommissioning approach of a recent project at Los Alamos. Included are the following technical objectives: site characterization work that provided a thorough physical, chemical, and radiological assessment of the contamination at the site; demonstration of the safe and cost-effective dismantlement of a highly contaminated and activated nuclear-fuelded reactor; and techniques used in minimizing radioactive and hazardous waste. 12 figs

  8. Hispanics of a San Diego Barrio.

    Science.gov (United States)

    1983-04-01

    electronic music of Black American discoteques, played loudly on automobile stereo systems or on the oversized "sound boxes" which have more...rider" automobiles , and intense partying are parts of an essentially anti-social image held by the larger San Diego community. Parallels might be drawn...Research Naval Academy, U.S. Annapolis, MD 21402 - .I . . . . I I II I I l i List 7 HRM Officer in Charge Commanding Officer Human Resource Management

  9. Fusion reactor development: A review

    International Nuclear Information System (INIS)

    Anon.

    1983-01-01

    This paper is a review of the current prospects for fusion reactor development based upon the present status in plasma physics research, fusion technology development and reactor conceptual design for the tokamak magnetic confinement concept. Recent advances in tokamak plasma research and fusion technology development are summarized. The direction and conclusions of tokamak reactor conceptual design are discussed. The status of alternate magnetic confinement concept research is reviewed briefly. A feasible timetable for the development of fusion reactors is presented

  10. The Ability-Track Glass Ceiling of Israeli Schooling: Lessons from a Comparative Analysis of Israeli and Australian PISA 2012 Data

    Science.gov (United States)

    Razer, Michal; Mittelberg, David; Ayalon, Snait

    2018-01-01

    Israeli students ranked in the bottom third of the countries surveyed by PISA 2012 in mathematical literacy, while the gap between the highest and lowest scores was the second largest in the OECD. This paper explores which variables led to disparities in mathematical literacy between different socioeconomic levels and between Israeli Arabs and…

  11. A Multilevel Multidimensional Item Response Theory Model to Address the Role of Response Style on Measurement of Attitudes in PISA 2006

    Science.gov (United States)

    Lu, Yi

    2012-01-01

    Cross-national comparisons of responses to survey items are often affected by response style, particularly extreme response style (ERS). ERS varies across cultures, and has the potential to bias inferences in cross-national comparisons. For example, in both PISA and TIMSS assessments, it has been documented that when examined within countries,…

  12. SOCIALIZACIÓN PARENTAL Y CONDUCTAS ANTISOCIALES - DELICTIVAS EN ALUMNOS DE TERCERO, CUARTO Y QUINTO GRADOS DE SECUNDARIA

    OpenAIRE

    PORTOCARRERO PARDO, YESSICA; UNIVERSIDAD NACIONAL DEL ALTIPLANO

    2014-01-01

    ResumenEl objetivo principal de esta investigación fue determinar si existe relación entre Socialización Parental y Conductas Antisociales-Delictivas; siendo la población objetivo de la institución Educativa Pública Emblemático «San Pedro» en una muestra de 159 alumnos del tercero, cuarto y quinto grados de secundaria de ambos sexos, de 13 a 18 años. Instrumentos utilizados, La Escala de Estilos de Socialización Parental enAdolescentes (ESPA29) de Musitu & García, (2001), y el Cuestionari...

  13. Mathematics Curriculum in Ireland: The Influence of PISA on the Development of Project Maths

    Directory of Open Access Journals (Sweden)

    Liz KIRWAN

    2015-12-01

    Full Text Available This article interrogates the extent to which the Organization for Economic Cooperation and Development (OECD through its Programme for International Student Assessment (PISA influenced the development of Project Maths, a new second-level mathematics education policy in Ireland. It argues that the Irish government, in its revision of mathematics education policy, was strongly influenced by PISA and that concern with the country’s ‘average’ placement in the international assessment was instrumental in defining the direction of the revision. It traces the genetic imprint of PISA on the development of curriculum policy, the new mathematics syllabus, its content and assessment. It argues that Project Maths sets out to follow closely the PISA conceptual framework. However, the analysis finds that Project Maths is not a mini-PISA but that the programme is comprised of two distinct approaches, on the one hand retaining the abstract, symbolic mathematics of sections of the pre-existing curriculum, while on the other emphasizing a PISA-like approach to pedagogy and to real-life problem solving.

  14. Mathematics curriculum in Ireland: The ınfluence of PISA on the development of project maths

    Directory of Open Access Journals (Sweden)

    Liz Kirwan

    2015-12-01

    Full Text Available This article interrogates the extent to which the Organization for Economic Cooperation and Development (OECD through its Programme for International Student Assessment (PISA influenced the development of Project Maths, a new second-level mathematics education policy in Ireland. It argues that the Irish government, in its revision of mathematics education policy, was strongly influenced by PISA and that concern with the country’s ‘average’ placement in the international assessment was instrumental in defining the direction of the revision. It traces the genetic imprint of PISA on the development of curriculum policy, the new mathematics syllabus, its content and assessment. It argues that Project Maths sets out to follow closely the PISA conceptual framework. However, the analysis finds that Project Maths is not a mini-PISA but that the programme is comprised of two distinct approaches, on the one hand retaining the abstract, symbolic mathematics of sections of the pre-existing curriculum, while on the other emphasizing a PISA-like approach to pedagogy and to real-life problem solving.

  15. EL CONCEPTO DE EVOLUCIÓN: UN NUEVO CONOCIMIENTO MÁS AMPLIO Y AJUSTADO A LA REALIDAD CIENTÍFICA EN ESTUDIANTES DE NOVENO GRADO A PARTIR DE UNA RECONCEPTUALIZACIÓN

    Directory of Open Access Journals (Sweden)

    Eliana Mitzin Parra Pérez

    2015-12-01

    Full Text Available El estudiante, en cuanto indaga permanentemente por el saber, ambicionando establecer un equilibrio con sus discernimientos, busca respuestas, se plantea interrogantes, investiga y descubre, hasta llegar al conocimiento que le hace volver de nuevo al equilibrio cognitivo, de tal manera que la resolución de este conflicto se obtiene como resultado el aprendizaje, logrando que se reconfigure el esquema cognitivo previo. De acuerdo con lo anterior, el presente artículo da cuenta de la experiencia pedagógica realizada en el I.E.D Colegio San Martín de Porres ubicado en Bogotá, localidad de Chapinero, con estudiantes de noveno grado de la jornada de la tarde con edades entre los 14 y 19 años, bajo el enfoque de conflicto cognitivo. Con el objetivo de  romper la estructura cognitiva del alumno, generando una nueva reequilibración, resultado de un conocimiento enriquecido,  se implementó la unidad didáctica: “INTERPRETACIÓN DE LA EVOLUCIÓN: Enseñanza desde el conflicto cognitivo” guiando este concepto por tres condiciones: desafío, equilibro entre lo fácil y lo difícil, y su entendimiento. Evidenciando en los resultados obtenidos, un cambio conceptual que tuvo cada estudiante con respecto al concepto de evolución y los temas que sirvieron de mecanismo de abordaje. Concluyendo así que es posible despertar el interés de los estudiantes, al desarrollar el componente afectivo y de interrelación con el diario vivir, los condujo al fortalecimiento y manejo del aprendizaje científico.

  16. La enfermería de la Orden de San Juan de Dios en el Chile colonial

    Directory of Open Access Journals (Sweden)

    Julia Cristobalina Huaiquián-Silva

    2013-01-01

    Full Text Available Objetivo: describir las prácticas de enfermería en Chile durante la época colonial, prestando especial atención a la influencia de España en dicho proceso. Método: investigación cualitativa de abordaje socio-histórico; las fuentes primarias corresponden a textos históricos de Chile recuperados en la Biblioteca Virtual Memoria Chilena, y a 34 documentos recopilados en el Archivo Museo San Juan de Dios, Casa de los Pisa, en Granada, España, titulados “Listado de los hermanos de San Juan de Dios que vivían en Chile (207 años y un índice de documentos inéditos copiados de los archivos histórico nacional y del antiguo hospital, por Faustino Calvo”. La recolección de la información se efectuó con ficha documental confeccionada por la investigadora, complementada con fotografías. El análisis de los datos se realizó a través de análisis de contenido. Resultados: la Orden de San Juan de Dios llegó a Chile en el año 1617 a los hospitales de Santiago y Concepción y se expandió a las ciudades de La Serena, Valparaíso, San Juan de la Frontera, Talca, Chillan, Concepción y Valdivia. Por más de doscientos años la Orden permaneció en Chile brindando asistencia hospitalaria y de enfermería a través de los cuidados religiosos. Conclusión: con la llegada de la Orden al país mejoró indiscutiblemente la organización de los cuidados de salud al interior de los hospitales, que a partir de esa fecha se administraron de forma organizada, con altos estándares de higiene y limpieza, vigilando sigilosamente la alimentación de sus pacientes y con una gran preocupación por brindar asistencia espiritual a quienes necesitasen de sus servicios.

  17. Water consumption of the estevia (Stevia rebaudiana (Bert. Bertoni crop estimated through microlysimeter

    Directory of Open Access Journals (Sweden)

    Fronza Diniz

    2003-01-01

    Full Text Available The knowledge of water requirement of crops in the different growing phases elicits higher crop yield and rational use of water resource. The aim of this work was to estimate the water consumption of stevia using two constant watertable microlysimeters. The research was conducted in San Piero a Grado, Pisa, Italy. The data were collected daily from June, 1st, to October, 22th, 2000. Reference evapotranspiration was determined by the Penman-Monteith-FAO method, in the same period. Microlysimeters watertables level were maintained at the 35 cm depth. Crop evapotranspiration for the total cicle (80 days was 464 mm. For the most water consuming phase, crop average evapotranspiration was 5.44 mm day-1. The crop coefficient values were 1.45 for the first 25 days, 1.14 for the next period (26 to 50 days, and 1.16 for the latest period (51 to 80 days. The stevia leaf yield of the microlysimeters was 4.369 kg ha-1 and their steviosideo content 6.49%.

  18. Reactor utilization, Annex A

    International Nuclear Information System (INIS)

    Martinc, R.; Stanic, A.

    1984-01-01

    Reactor was operated until August 1984 due to prohibition issued by the Ministry since the reactor does not have the emergency cooling system nor special filters in the ventilation system yet. This means that the operation plan was fulfilled by 69%. This annex includes detailed tables containing data about utilization of reactor experimental channels, irradiated samples, as well as interruptions of operation. Detailed data about reactor power during this period are shown as well

  19. [Pediatric history in Pisa and the birth of world pediatrics].

    Science.gov (United States)

    Farnetani, I; Farnetani, F

    2009-10-01

    The University of Pisa was the first in the world to nominate a professor of pediatirics. It was Gaetano Palloni who was nominated professor of ''children diseases'' on April 8(th), 1802 and was assigned to one of the two branch offices of the Pisan University, the one in Florence. He was assigned to ''Ospedale degli Innocenti'' where he taught and also supervised the clinical part. In 1923, he was nominated director of the Gennaro Fiore paediatric clinic and stayed there until 1952 when Augusto Gentili took over. In half a century there were only two professors and this didactic continuity made it possible for Pisa to become one of the greatest Italian pediatric schools.

  20. LA VARIABILIDAD GENÉTICA DE LA Persea americana M.: UN ESTUDIO SOBRE LA ENSEÑANZA DE LA BIOLOGÍA MOLECULAR DESDE EL LABORATORIO EN GRADO 10°

    Directory of Open Access Journals (Sweden)

    Carlos Miguel Monsalve Agudelo

    2015-12-01

    Full Text Available El presente artículo, expone el trabajo realizado en desarrollo de proyecto de grado de maestría, con estudiantes de la I.E. San Fernando de Amagá, Antioquia, en el periodo comprendido entre Julio de 2013 y junio de 2014, en la línea de profundización de la enseñanza de la biología molecular. Para la ejecución del trabajo se tomaron como base dos grupos, uno control y uno experimental, en los cuales se aplicó un ciclo de aprendizaje a través de videos sobre variabilidad genética explicada en la expedición de Darwin, situaciones problema, clases magistrales y trabajos de campo como la diferenciación de especies vegetales a partir de características morfológicas. En el grupo experimental se introdujo el trabajo de laboratorio como base de la enseñanza de la variabilidad genética desde la biología molecular. Desde el punto de vista pedagógico, se considera que la intervención permitió un avance en el proceso de aprendizaje de los estudiantes en el acercamiento a los contenidos conceptuales, procedimentales y actitudinales referentes a la variabilidad genética. Así mismo desde el aspecto biológico, se determinó la variabilidad genética del aguacate en el municipio de Amagá, al resultar diferente dos de las muestras en la prueba del gel electroforesis PCR-RFLPs para 6 muestras de plantas de Aguacate con marcador de 50pb.

  1. THE DEBATE CONCERNING THE PISA SURVEYS IN FRANCE

    Directory of Open Access Journals (Sweden)

    Eguzki Urteaga

    2010-02-01

    Full Text Available The international program for the follow-up of the knowledge of the pupils, known as PISA (Programme for International Student Assessment, does not enjoy the French observer. Published every three years, his evaluations of the educational systems of thirty countries of the OECD, and nowadays of other fifty countries, have a methodological recognized quality and resist to the majority of the objections that are directed for him. Not uselessly, they continue being widely ignored in France where they try to discredit them very often. The French reticence towards this research come from medium or including mediocre classification in which places the Hexagon in the three areas evaluated by PISA: comprehension of writing, mathematics and scientific culture. If the educational level rises, the differences between pupils increase.

  2. Geología de la parte sur de la Sierra de San Luis y granitoides asociados, Argentina

    Directory of Open Access Journals (Sweden)

    Llambías, E. J.

    1992-12-01

    Full Text Available The lower Palaeozoic basement of the southern part of Sierra de San Luis, Argentina, is made up of metamorphic rocks, granitoids and ultramafic rocks. The metamorphic grade ranges from the lower limit of greenschist facies through the upper limit of amphibolite facies, in apparent transition. The lower grade metamorphic rocks include slates, metavolcanics, metaconglomerates, quartzites and phyllites. Rocks with intermediate metamorphism are biotite-quartz-oligoclase schists with abundant pegmatoid veins. The higher grade metamorphism is represented by gneisses, amphibolites and migmatites, to which mafic and ultramafic bodies are associated. Three deformation phases have been recognized, being the last one (D3, of ordovician age, responsible of the most marked structures.The granitoids were grouped into pre-, syn- and post-kynematic bodies respect to D3. The pre-kynematic granitoids are located within the belt of lower grade metamorphic rocks and are composed of tonalites, granodiorites and monzogranites, strongly deformed. Their age is unknown. The syn-kynematic bodies are mainly garnet-moscovite-bearing leucogranodiorites. They show low thermal and rheological contrasts respect to the country rocks, and the age is 454 ± 21 m.a. The post-kynematic granitoids are mainly monzogranites with K-feldspar megacrysts and abundant sphene. They are subcircular and discordant, and are associated with an extensional regime. Their age is comprised between 423 and 320 m.a., and corresponds to the end of the Famatinian cycle.El basamento cristalino de la parte sur de la Sierra de San Luis, de edad Paleozoico Inferior, está constituido por rocas metamórficas, granitoides y rocas ultramáficas. El grado de metamorfismo varía desde la parte baja de esquistos verdes hasta la parte alta de la facies anfibolita, siendo sus relaciones de aparente transicionalidad. Las rocas con menor grado metamórfico consisten en pizarras, metavolcanitas, metaconglomerados

  3. 77 FR 34984 - Notice of Intent To Repatriate a Cultural Item: San Diego Museum of Man, San Diego, CA

    Science.gov (United States)

    2012-06-12

    ...The San Diego Museum of Man, in consultation with the appropriate Indian tribes, has determined that a cultural item meets the definition of unassociated funerary object and repatriation to the Indian tribes stated below may occur if no additional claimants come forward. Representatives of any Indian tribe that believes itself to be culturally affiliated with the cultural item may contact the San Diego Museum of Man.

  4. Las asignaturas de Álgebra Lineal y Geometría Lineal en los Grados en Matemáticas y Física de la Universidad de Alicante

    OpenAIRE

    Alonso-González, Clementa; Climent, Joan-Josep; Fajardo Gómez, María Dolores; Rodríguez Álvarez, Margarita; Soler Escrivà, Xaro

    2017-01-01

    Esta red de investigación en docencia es una continuación natural de la Red 3577 constituida en el curso académico 2015-2016 y cuyo objetivo principal era analizar el desarrollo de las asignaturas Álgebra Lineal I, Álgebra Lineal II y Geometría Lineal en el Grado en Matemáticas de la Facultad de Ciencias de la Universidad de Alicante. Durante este curso académico 2016-2017 también ha comenzado su andadura en la Universidad de Alicante el Grado en Física. Aunque este grado es aún muy joven, ya...

  5. Análisis sobre el grado de conocimiento e identificación de los tarraconenses con la candidatura a los Juegos Mediterráneos de Tarragona en 2017

    Directory of Open Access Journals (Sweden)

    Vicent Añó Sanz

    2013-03-01

    Full Text Available El objetivo de este estudio fue analizar la evolución entre los años 2009 y 2010 en el grado de conocimiento e identificación de los tarraconenses con la candidatura a los Juegos Mediterráneos de Tarragona en 2017. Se recogieron las opiniones de dos muestras de ciudadanos con un año de diferencia (N = 246 para 2009 y N = 307 para 2010. Los resultados mostraron una evolución positiva de un año a otro en aspectos como el conocimiento sobre lo que son los Juegos Mediterráneos, el grado de información recibida, el grado con el que se identifica la sociedad con este evento deportivo, el grado de dificultad percibida en la organización del mismo, el grado de preparación de la ciudad en servicios como la sanidad, los alojamientos y la restauración, el grado de coordinación entre las administraciones públicas o el trabajo realizado por la candidatura. No obstante, una gran parte de los ciudadanos no consideraban que la ciudad estuviese bastante o muy preparada en otras áreas como el transporte público o las instalaciones deportivas, observándose una evolución negativa entre los dos años en los accesos desde el exterior y en los servicios de limpieza y de seguridad. Los resultados de este estudio pueden ayudar a mejorar la implicación y participación de la ciudadanía en este tipo de acontecimientos deportivos.

  6. Relevancia de los grados de Simpson en la resección de meningiomas grado I

    Science.gov (United States)

    Ajler, Pablo; Beltrame, Sofía; Massa, Daniela; Tramontano, Julian; Baccanelli, Matteo; Yampolsky, Claudio

    2017-01-01

    Resumen Objetivo: Comparar el porcentaje de recurrencias en pacientes con meningiomas grado I de la OMS sometidos a exéresis microquirúrgica. Introducción: En 1957 Simpson estandarizó 5 grados de resección quirúrgica para los meningiomas intracraneanos y el porcentaje de recurrencia relacionado con cada uno, estableciendo el paradigma de que la remoción agresiva de estos tumores junto con fragmentos durales y óseos era necesario para alcanzar la curación. Los avances principalmente en Resonancia Magnética, anatomía patológica y técnica microqurúrgica nos llevan a plantear la relevancia actual de dicha clasificación. Métodos: Se realizó una revisión retrospectiva de los pacientes operados de meningiomas grado I entre Febrero de 2006 y Diciembre de 2015. Se analizaron las imágenes pre y postoperatorias y la anatomía patológica. Las variables se relacionaron mediante un análisis estadístico multivariado estableciendo como estadísticamente significativo una P < 0.05. Resultados: No se objetivó una diferencia estadísticamente significativa entre el número de recidivas y el grado de resección tumoral según Simpson I, II, III o IV (P = 0,3117). Esto puede afirmarse para los grados Simpson I y II en donde el número de pacientes incluidos en la muestra (n) fue alto. Al analizar como factor de recurrencia la localización tumoral tampoco se encontró una diferencia significativa en cuanto al porcentaje de recidivas entre aquellos tumores localizados en la convexidad, base de cráneo y parasagitales (P = 0,2203). Conclusión: Para los meningiomas grado I la exéresis Simpson I no presenta diferencias significativas con la Simpson II en cuanto a la recurrencia tumoral, por lo que aumentar la morbilidad del procedimiento no tendría justificación. Un replanteo de la escala de resección debería idearse teniendo en cuenta la clasificación de la OMS. PMID:29142775

  7. Análisis y puesta en marcha de estrategias de coordinación de asignaturas en 1º y 2º de grado de Psicología

    OpenAIRE

    Rueda Sánchez, Mercedes I.; Jenaro Río, Cristina

    2012-01-01

    Este trabajo se ha realizado en el marco de las labores de coordinación del Grado de Psicología, durante el curso 2011/2012, en la Facultad de Psicología de la Universidad de Salamanca. El objetivo ha sido conocer la percepción que tienen profesores y alumnos respecto al grado de formación y adquisición de competencias. Por un lado, hemos pretendido conocer la percepción que tienen los profesores sobre cómo consideran que han formado a sus alumnos en las competencias específicas y transversal...

  8. Inteligencia emocional y relaciones interpersonales en estudiantes de 6° grado de primaria de la I.E. N° 6031 “Santa María de Lurín”- distrito de Lurín, 2015

    OpenAIRE

    Salinas Salinas, Roberto Juan

    2016-01-01

    Este estudio responde al problema general: ¿Existe relación directa y significativa entre la inteligencia emocional y las relaciones interpersonales en estudiantes de 6° grado de primaria de la I.E N° 6031 “Santa María de Lurín”, 2015? Y tuvo como objetivo determinar la relación entre la inteligencia emocional las relaciones interpersonales en estudiantes de 6° grado de primaria de la I.E N° 6031 “Santa María de Lurín”, 2015. El estudio ha sido de tipo básica sustantiva y de...

  9. A SANS study of capillary condensation in porous media

    International Nuclear Information System (INIS)

    Lin, M.; Glinka, C.; Sinna, S.; Huang, J.; Abeles, B.; Johnson, J.; Drake, J.

    1990-01-01

    The authors use small angle neutron scattering (SANS) to study the microstructure of porous Vycor glass and the capillary condensation of fluids in the medium. Using a chord distribution model, they can predict the structure factor measured by SANS. Excellent agreement with the data is obtained. The fitted parameters characterize quantitatively the porous structure before and during the process of condensation, and are in good agreement with isotherm measurements. However, at the latest stages of the process, when all the pores are nearly filled, the model can no longer describe the system

  10. A nuclear reactor

    International Nuclear Information System (INIS)

    Keller, W.

    1974-01-01

    Between the steel pressure vessel of the pressurized water power reactor and the biological shield a gap is found which enables inspections as well as cooling by air or gas. Within the gap, fins are equally distributed around the circumference of the pressure vessel summing parallel to each other and to the longitudinal axis of the vessel or being inclined. The fins cross the gap for about 9/10. Each fin consists of a sectional bar supported with its foot on a girder. The girder has got a rectangular steel section of two sectional iron parts. Between one of the parts and a plate anchored in the biological shield a ceramic body is inserted as a heat insulation. A further heat insulation of aluminium foils connects the fins with each other and divides the gap into two concentric subspaces which can be streamed through by a gas having different temperatures. (DG) [de

  11. San Diego Met High School: Personalization as a Foundation

    Science.gov (United States)

    Principal Leadership, 2010

    2010-01-01

    The mission of San Diego Met High School is to prepare students for college and the workforce through active learning, academic rigor, and community involvement in a small school setting. Because personalization is a key component of the school culture, advisories of 20-25 students work with the same teachers for all four years. Advisers, parents,…

  12. Reactor

    International Nuclear Information System (INIS)

    Ikeda, Masaomi; Kashimura, Kazuo; Inoue, Kazuyuki; Nishioka, Kazuya.

    1979-01-01

    Purpose: To facilitate the construction of a reactor containment building, whereby the inspections of the outer wall of a reactor container after the completion of the construction of the reactor building can be easily carried out. Constitution: In a reactor accommodated in a container encircled by a building wall, a space is provided between the container and the building wall encircling the container, and a metal wall is provided in the space so that it is fitted in the building wall in an attachable or detatchable manner. (Aizawa, K.)

  13. California: Environmental Health Coalition Clean Ports, Healthy Communities in San Diego (A Former EPA CARE Project)

    Science.gov (United States)

    The Environmental Health Coalition (EHC) is a recipient of a CARE Level II cooperative agreement grant. The Clean Ports, Healthy Communities in San Diego targets the Barrio Logan and Old Town National City areas located along San Diego Bay.

  14. Reactor

    International Nuclear Information System (INIS)

    Toyama, Masahiro; Kasai, Shigeo.

    1978-01-01

    Purpose: To provide a lmfbr type reactor wherein effusion of coolants through a loop contact portion is reduced even when fuel assemblies float up, and misloading of reactor core constituting elements is prevented thereby improving the reactor safety. Constitution: The reactor core constituents are secured in the reactor by utilizing the differential pressure between the high-pressure cooling chamber and low-pressure cooling chamber. A resistance port is formed at the upper part of a connecting pipe, and which is connect the low-pressure cooling chamber and the lower surface of the reactor core constituent. This resistance part is formed such that the internal sectional area of the connecting pipe is made larger stepwise toward the upper part, and the cylinder is formed larger so that it profiles the inner surface of the connecting pipe. (Aizawa, K.)

  15. Ethnicity and Phonetic Variation in a San Francisco Neighborhood

    Science.gov (United States)

    Hall-Lew, Lauren

    2009-01-01

    This dissertation advances research in sociolinguistics by analyzing phonetic variation in a majority Asian American community in San Francisco, California. As one of the first community studies focusing on Asian Americans in an urban US context, this work speaks to ongoing discussions about speaker ethnicity, phonetic variation, and regional…

  16. SANS contrast variation on a dendrimer host-guest complex

    NARCIS (Netherlands)

    Kleppinger, R.; Mortensen, K.; Meijer, E.W.

    2002-01-01

    Small-angle neutron scattering (SANS) technique was used to study the configurational changes in an oligoethyleneoxy-functionalized poly(propyleneimine) dendrimer (host) when forming complexes with rose bengal (guest). Guinier fits to the scattering data recorded at max. contrast indicated a

  17. Safety equipment in a reactor

    International Nuclear Information System (INIS)

    Shiratori, Hirozo; Ishiyama, Satoshi; Ugawa, Yukio.

    1976-01-01

    Object: To safely retain, even if fuel should be molten and flown through the bottom of a container in a reactor, the molten fuel to remove heat generation of the fuel to prevent occurrence of a critical trouble. Structure: A reactor container housing a core and coolant has thereunder a separation dome in a central portion thereof and a partitioning plate coaxially and circularly disposed in the periphery of the separation dome, with a tray formed of magnesium oxide being disposed. Further, a cooling path system is provided so as to surround the tray. The cooling path system and the reactor container are surrounded and protected by a reactor wall provided with heat insulating refractory bricks, a coolant pouring system extends through the reactor wall, and the coolant is supplied to the tray. (Furukawa, Y.)

  18. A simulation of the San Andreas fault experiment

    Science.gov (United States)

    Agreen, R. W.; Smith, D. E.

    1974-01-01

    The San Andreas fault experiment (Safe), which employs two laser tracking systems for measuring the relative motion of two points on opposite sides of the fault, has been simulated for an 8-yr observation period. The two tracking stations are located near San Diego on the western side of the fault and near Quincy on the eastern side; they are roughly 900 km apart. Both will simultaneously track laser reflector equipped satellites as they pass near the stations. Tracking of the Beacon Explorer C spacecraft has been simulated for these two stations during August and September for 8 consecutive years. An error analysis of the recovery of the relative location of Quincy from the data has been made, allowing for model errors in the mass of the earth, the gravity field, solar radiation pressure, atmospheric drag, errors in the position of the San Diego site, and biases and noise in the laser systems. The results of this simulation indicate that the distance of Quincy from San Diego will be determined each year with a precision of about 10 cm. Projected improvements in these model parameters and in the laser systems over the next few years will bring the precision to about 1-2 cm by 1980.

  19. Quaternary geology of Alameda County, and parts of Contra Costa, Santa Clara, San Mateo, San Francisco, Stanislaus, and San Joaquin counties, California: a digital database

    Science.gov (United States)

    Helley, E.J.; Graymer, R.W.

    1997-01-01

    Alameda County is located at the northern end of the Diablo Range of Central California. It is bounded on the north by the south flank of Mount Diablo, one of the highest peaks in the Bay Area, reaching an elevation of 1173 meters (3,849 ft). San Francisco Bay forms the western boundary, the San Joaquin Valley borders it on the east and an arbitrary line from the Bay into the Diablo Range forms the southern boundary. Alameda is one of the nine Bay Area counties tributary to San Francisco Bay. Most of the country is mountainous with steep rugged topography. Alameda County is covered by twenty-eight 7.5' topographic Quadrangles which are shown on the index map. The Quaternary deposits in Alameda County comprise three distinct depositional environments. One, forming a transgressive sequence of alluvial fan and fan-delta facies, is mapped in the western one-third of the county. The second, forming only alluvial fan facies, is mapped in the Livermore Valley and San Joaquin Valley in the eastern part of the county. The third, forming a combination of Eolian dune and estuarine facies, is restricted to the Alameda Island area in the northwestern corner of the county.

  20. 76 FR 6517 - San Luis & Rio Grande Railroad-Petition for a Declaratory Order

    Science.gov (United States)

    2011-02-04

    ... DEPARTMENT OF TRANSPORTATION Surface Transportation Board [Docket No. FD 35380] San Luis & Rio... petition filed by San Luis & Rio Grande Railroad (SLRG), the Board instituted a declaratory order... proposed operation of a truck-to-rail transload facility in Antonito, Colorado. See San Luis & Rio Grande R...

  1. La formación en TIG en los nuevos planes de grados y másteres: la enseñanza de las TIG en España y en Europa.

    OpenAIRE

    Gómez Delgado, Montserrat

    2016-01-01

    Aportación a la mesa redonda "Mesa redonda: La formación en TIG en los nuevos planes de grados y másteres", desarrollada en el marco del XVII Congreso Nacional TIG. Universidad de Málaga y Asociación de Geógrafos Españoles.

  2. PISA Proficiency Scores Predict Educational Outcomes

    Science.gov (United States)

    Fischbach, Antoine; Keller, Ulrich; Preckel, Franzis; Brunner, Martin

    2013-01-01

    The "Programme for International Student Assessment" (PISA) examines the extent to which 15-year-old students who are near the end of compulsory education have acquired some of the competencies essential for participation in the labor market and society. Given that this participation hinges on educational attainment, it is crucial to…

  3. Preparing the construction of a school reactor

    International Nuclear Information System (INIS)

    Matejka, K.

    1977-01-01

    The possibilities are discussed of teaching and training nuclear reactor operation and control, teaching experimental reactor physics and investigating reactor lattice parameters using a training reactor to be installed at the Faculty of Nuclear Science and Physical Engineering in Prague. Requirements are indicated for the reactor's technical design and the Faculty's possibilities to contribute to its construction. (J.B.)

  4. Cementerio San Camilo de Pereira. Representación visual y material del diseño, las artes y la arquitectura; desde los primeros años del siglo XX, hasta la década del ochenta

    OpenAIRE

    López Morales, Alfonso Javier

    2015-01-01

    Esta tesis de grado es producto de la investigación realizada por el autor entre los años 2011 a 2015, enmarcada dentro de los estudios de la Maestría en Historia de la Universidad Tecnológica de Pereira, cuyo objetivo principal fue demostrar en qué momento el Cementerio San Camilo de Pereira, se convierte en representación visual y material del diseño, las artes y la arquitectura, desde los primeros años del siglo XX, década de los treinta hasta la década de los ochenta. El corpus documental...

  5. Why Do Boys and Girls Perform Differently on PISA Reading in Finland? The Effects of Reading Fluency, Achievement Behaviour, Leisure Reading and Homework Activity

    Science.gov (United States)

    Torppa, Minna; Eklund, Kenneth; Sulkunen, Sari; Niemi, Pekka; Ahonen, Timo

    2018-01-01

    The present study examined gender gap in Program for International Student Assessment (PISA) Reading and mediators of the gender gap in a Finnish sample (n = 1,309). We examined whether the gender gap in PISA Reading performance can be understood via the effects of reading fluency, achievement behaviour (mastery orientation and task-avoidant…

  6. Rethinking the Pattern of External Policy Referencing: Media Discourses over the "Asian Tigers" PISA Success in Australia, Germany and South Korea

    Science.gov (United States)

    Waldow, Florian; Takayama, Keita; Sung, Youl-Kwan

    2014-01-01

    The article compares how the success of the "Asian Tiger" countries in PISA, especially PISA 2009, was depicted in the media discussion in Australia, Germany and South Korea. It argues that even in the times of today's "globalised education policy field", local factors are important in determining whether or not a country…

  7. Why Do East Asian Children Perform so well in PISA? An Investigation of Western-Born Children of East Asian Descent

    Science.gov (United States)

    Jerrim, John

    2015-01-01

    A small group of high-performing East Asian economies dominate the top of the Programme for International Student Assessment (PISA) rankings. This has caught the attention of Western policymakers, who want to know why East Asian children obtain such high PISA scores, and what can be done to replicate their success. In this paper I investigate…

  8. Neutron source for a reactor

    International Nuclear Information System (INIS)

    Kobayashi, Hiromasa.

    1975-01-01

    Object: To easily increase a start-up power of a reactor without irradiation in other reactors. Structure: A neutron source comprises Cf 252 , a natural antimony rod, a layer of beryllium, and a vessel of neutron source. On upper and lower portion of Cf 252 are arranged natural antimony rods, which are surrounded by the Be layer, the entirety being charged into the vessel. The Cf 252 may emit neutron, has a half life more than a period of operating cycle of the reactor and is less deteriorated even irradiated by radioactive rays while being left within the reactor. The natural antimony rod is radioactivated by neutron from Cf 252 and neutron as reactor power increases to emit γ rays. The Be absorbs γ rays to emit the neutron. The antimony rod is irradiated within the reactor. Further, since the Cf 252 is small in neutron absorption cross section, it is hard to be deteriorated even while being inserted within the reactor. (Kamimura, M.)

  9. Who needs a small reactor?

    International Nuclear Information System (INIS)

    Wood, Janet.

    1991-01-01

    The opportunities and problems facing small reactors were debated at the Delhi seminar. It was established that these were markets where small reactors, producing heat as well as electricity, might be of use. Small combined heat and power reactors would be more useful in district heating than would large reactors, as their optimum heat production is in line with current district heating schemes. Most process heat requirements are below 900 o C and so may be provided by small nuclear plants. Several areas in electricity supply where small and medium sized reactors could find a market were also identified. Despite good reasons for favouring nuclear plants in these markets, such as no production of carbon dioxide, no need to use expensive oil or other scarce fossil fuels and flexibility, these are, however, disincentives to potential buyers. While serial production would decrease plant costs, the lead plants would bear heavy financial risks. Currently too many options in plant design make it difficult to present the advantages of small reactor technology. Siting reactors near centres of population would be problematical. The disposal of spent fuel and radioactive wastes would create problems in developing or non-nuclear countries. Over and above all these problems, however, was that of public acceptance. Some ways of overcoming these disincentives were discussed. (author)

  10. San Fernando: ¿utopía o proyecto inconcluso?

    Directory of Open Access Journals (Sweden)

    Juan Pablo Murillo

    2008-06-01

    Full Text Available El estudio analiza los distintos proyectos de modernización ocurridos en la Facultad de Medicina de San Fernando, en el contexto de una seria crisis institucional a finales del siglo XX. Para ello, a partir de las categorías de colectivo de pensamiento y estilo de pensamiento propuestos por Ludwick Fleck, se hace un estudio de los procesos socio-históricos relacionados con los distintas iniciativas desplegadas en la más antigua escuela de medicina del Perú. Un análisis de las diferentes iniciativas identificadas nos llevan a la hipótesis de que la crisis de San Fernando, como colectivo académico, se basa en las contradicciones propias de un proyecto institucional inconcluso, que además cíclicamente se manifiesta asincrónico y disfuncional, al complejo y cambiante entorno institucional y cultural de la sociedad peruana. El estudio sistematiza las principales características de los diferentes proyectos de modernización institucional. Luego de un análisis del actual contexto del sector salud peruano, a partir de los procesos identificados, se propone una agenda de desarrollo, orientada a generar un ciclo de acumulación y crecimiento académico, que constituya una etapa de transición de cara a los retos que el siglo XXI plantea a los miembros del colectivo San Fernandino.

  11. Secuencia didáctica: Introducción a los significados clásico y frecuencial de la probabilidad para estudiantes de grado quinto de primaria

    OpenAIRE

    Velásquez Gómez, Mónica

    2014-01-01

    En este trabajo se plantea la propuesta de una secuencia didáctica para la enseñanza de la probabilidad en el grado quinto de primaria. En el documento se incluye una revisión de los significados de la probabilidad, obstáculos en el uso de conceptos probabilísticos, coherencia y pertinencia con los lineamientos curriculares y un breve análisis de los conocimientos previos de un grupo de estudiantes del grado quinto de primaria. En el documento se describe el proceso de construcción de la ...

  12. Diseños didácticos y trayectorias de aprendizaje de la geometría de estudiantes sordos, en los primeros grados de escolaridad

    Directory of Open Access Journals (Sweden)

    Olga Lucía León

    2014-01-01

    Full Text Available Este artículo presenta resultados de investigaciones sobre la relación trayectorias de aprendizaje y diseños didácticos para la enseñanza inicial de la geometría a estudiantes sordos. La problemática de investigación vincula a un marco de referencia de diseños didácticos para todos y a un marco metodológico de investigación de diseño a partir de experimentos de enseñanza, las preguntas: ¿Qué exigencias hay que satisfacer cuando se desarrollan diseños didácticos para todos en educación matemática? ¿Qué tipos de trayectorias reales de aprendizaje surgen cuando se vinculan en las trayectorias hipotéticas de aprendizaje condiciones de aprendizaje de las poblaciones sordas? El desarrollo de la Trayectorias de Aprendizaje se llevó a cabo en un aula multigradual en la que participaron 10 estudiantes de tercer grado (Hipoacúsico y sordos profundos cuyas edades oscilaban entre los 9 y 12 años.

  13. Diseños didácticos y trayectorias de aprendizaje de la geometría de estudiantes sordos, en los primeros grados de escolaridad

    Directory of Open Access Journals (Sweden)

    Olga Lucía León

    2014-09-01

    Full Text Available Este artículo presenta resultados de investigaciones sobre la relación trayectorias de aprendizaje y diseños didácticos para la enseñanza inicial de la geometría a estudiantes sordos. La problemática de investigación vincula a un marco de referencia de diseños didácticos para todos y a un marco metodológico de investigación de diseño a partir de experimentos de enseñanza, las preguntas: ¿Qué exigencias hay que satisfacer cuando se desarrollan diseños didácticos para todos en educación matemática? ¿Qué tipos de trayectorias reales de aprendizaje surgen cuando se vinculan en las trayectorias hipotéticas de aprendizaje condiciones de aprendizaje de las poblaciones sordas? El desarrollo de la Trayectorias de Aprendizaje se llevó a cabo en un aula multigradual en la que participaron 10 estudiantes de tercer grado (Hipoacúsico y sordos profundos cuyas edades oscilaban entre los 9 y 12 años

  14. RESISTENCIA AL CORTE EN DISCONTINUIDADES CON DIFERENTES GRADOS DE RUGOSIDAD

    Directory of Open Access Journals (Sweden)

    Javier Fernando Camacho Tauta

    2009-01-01

    Full Text Available En esta investigación se realizaron ensayos triaxiales sobre rocas artifi ciales elaboradascon un mortero (arena, cemento y agua de diferente resistencia. Se incluyeron cilindros sin y con una discontinuidad orientada a 60° con respecto al eje horizontal y tres diferentes grados de rugosidad, (pulida plana, pulida ondulada y ondulada. Se determinaron los parámetros de resistencia de las probetas de mortero y se analizó la infl uencia de los diferentes grados de rugosidad utilizando el criterio de Barton, obteniendo el coefi ciente de rugosidad de la discontinuidad.

  15. Enseñanza de las leyes de Newton en grado décimo bajo la Metodología de Aprendizaje Activo

    Directory of Open Access Journals (Sweden)

    Jholman Andres Moreno

    2017-07-01

    Full Text Available Este documento presenta los resultados de la implementación de la unidad didáctica para la enseñanza de las leyes de Newton bajo la Metodología de Aprendizaje Activo en el grado 10-6 en la Institución Educativa Colegio Departamental La Esperanza de Villavicencio.  La metodología empleada fue la Investigación Acción, basada en cuatro pilares fundamentales: planear, actuar, observar y reflexionar, proceso cíclico que busca desde la interpretación de un aspecto social producir un cambio positivo de orden social. Para evaluar la efectividad de la unidad didáctica, se utilizó el factor de Hake,  para ello se analizan los resultados del pre test y el post-test, encontrándose que ésta  tuvo una ganancia de aprendizaje conceptual o ganancia relativa media.

  16. Quality of Educational Resources: A Comparative Evaluation of Schools That Joined PISA 2015 from Turkey and Singapore

    Science.gov (United States)

    Özkan, Metin; Balci, Suphi; Kayan, Selman; Is, Engin

    2018-01-01

    The objective of the study was to make a comparison among the two countries according to the level of sufficiency of educational resources and to determine the accuracy level at which variables related to educational resources can classify the schools on the basis of countries. Relational survey model was used. The sample group of the study was…

  17. San Francisco District Laboratory (SAN)

    Data.gov (United States)

    Federal Laboratory Consortium — Program CapabilitiesFood Analysis SAN-DO Laboratory has an expert in elemental analysis who frequently performs field inspections of materials. A recently acquired...

  18. The students' ability in the mathematical literacy for uncertainty problems on the PISA adaptation test

    Science.gov (United States)

    Julie, Hongki; Sanjaya, Febi; Anggoro, Ant. Yudhi

    2017-08-01

    One of purposes of this study was to describe the solution profile of the junior high school students for the PISA adaptation test. The procedures conducted by researchers to achieve this objective were (1) adapting the PISA test, (2) validating the adapting PISA test, (3) asking junior high school students to do the adapting PISA test, and (4) making the students' solution profile. The PISA problems for mathematics could be classified into four areas, namely quantity, space and shape, change and relationship, and uncertainty. The research results that would be presented in this paper were the result test for uncertainty problems. In the adapting PISA test, there were fifteen questions. Subjects in this study were 18 students from 11 junior high schools in Yogyakarta, Central Java, and Banten. The type of research that used by the researchers was a qualitative research. For the first uncertainty problem in the adapting test, 66.67% of students reached level 3. For the second uncertainty problem in the adapting test, 44.44% of students achieved level 4, and 33.33% of students reached level 3. For the third uncertainty problem in the adapting test n, 38.89% of students achieved level 5, 11.11% of students reached level 4, and 5.56% of students achieved level 3. For the part a of the fourth uncertainty problem in the adapting test, 72.22% of students reached level 4 and for the part b of the fourth uncertainty problem in the adapting test, 83.33% students achieved level 4.

  19. Policy Development for Grey Literature Resources. An Assessment of the Pisa Declaration

    OpenAIRE

    Savić, Dobrica (IAEA-NIS); Farace, Dominic J. (GreyNet); Frantzen, Jerry (GreyNet); Biagioni, Stefania (ISTI-CNR); Carlesi, Carlo (ISTI-CNR); Gruttemeier, Herbert (Inist-CNRS); Stock, Christiane (Inist-CNRS); Puccinelli, Roberto (CNR); GreyNet, Grey Literature Network Service

    2017-01-01

    In the spring of 2014, a workshop took place at the Italian National Council of Research in Pisa. The topic of this event dealt with policy development for grey literature resources. Some seventy participants from nine countries took an active part in the workshop – the outcome of which produced what is today known as the Pisa Declaration. This fifteen point document arising from the input of those who attended the workshop sought to provide a roadmap that would help to serve diverse communit...

  20. Policy Development for Grey Literature Resources: An Assessment of the Pisa Declaration

    OpenAIRE

    Savic, Dobrica; Farace, Dominic; Frantzen, Jerry; Biagioni, Stefania; Carlesi, Carlo; Gruttemeier, Herbert; Stock, Christiane

    2017-01-01

    In the spring of 2014, a workshop took place at the Italian National Council of Research in Pisa1. The topic of this event dealt with policy development for grey literature resources. Some seventy participants from nine countries took an active part in the workshop - the outcome of which produced what is today known as the Pisa Declaration2. This fifteen point document arising from the input of those who attended the workshop sought to provide a roadmap that would help to serve diverse commun...

  1. I problemi di matematica della Scuola Normale Superiore di Pisa

    CERN Document Server

    Profeti, Alessandro

    1998-01-01

    Nasce come aggiornamento del volume precedente ("I problemi di Matematica della Scuola Normale", 1984) e raccoglie gli esercizi di matematica assegnati all'esame di ammissione alla Scuola Normale Superiore di Pisa dal 1985 al 1997, con la loro risoluzione. Per rendere più efficace lo scopo didattico viene anche presentata una scelta di problemi relativi al periodo precedente (1905-1984). Il libro si rivolge a studenti e docenti della Scuola Secondaria, e si chiude con un Glossario in cui vengono richiamati i termini usati.

  2. Giordano da Pisa and the language of angels

    Directory of Open Access Journals (Sweden)

    Alessia Francone

    2012-06-01

    Full Text Available Among the issues about the angels considered by the Dominican preacher Giordano da Pisa, this essay studies the problem of their language. The question of the locutio angelica had become quite relevant in the scholastic thought from the XIIIth century and had been widely discussed by Thomas Aquinas and Giles of Rome; the study of this argument in Giordano da Pisa’s sermons shows the transition in the homiletic texts of a highly speculative theme and we can see how the preacher, who combines rather freely the positions of Thomas and Giles, filters the question for his lay public, simplifying the more difficult passages.

  3. PISA TESTS IN LATIN AMERICA: RESULTS IN CONTEXT

    Directory of Open Access Journals (Sweden)

    Guillermina Tiramonti

    2014-05-01

    Full Text Available The educational reforms implemented in Latin America in the ‘90s introduced changes in the modes of regulation of educational systems based on the adoption of mechanisms for assessing student achievement. Since 2000, eight Latin-American countries (Argentina, Chile, Uruguay, Colombia, Brazil, Costa Rica, Mexico and Peru are involved in the PISA tests. The article presents a brief review of the social and educational situation of the Region, relevant for the interpretation and comparative analysis of the results of these tests that is presented below.

  4. Minería, conflicto y mediadores locales: Minera San Xavier en Cerro de San Pedro, México Mineira, conflito e mediadores locais: Minera San Xavier em Cerro de San Pedro Mining, conflict and local brokers: Minera San Xavier in Cerro de San Pedro

    Directory of Open Access Journals (Sweden)

    Hernán Horacio Schiaffini

    2011-12-01

    Full Text Available Este trabajo indaga en las instancias de mediación que intervienen en la articulación de procesos económicos de gran escala y su puesta en práctica local. Basándonos en el conflicto que se produjo en el Municipio de Cerro de San Pedro (San Luis Potosí, México entre la empresa Minera San Xavier y el Frente Amplio Opositor (FAO a la misma, aplicamos el método etnográfico con el objetivo de describir las estructuras locales de mediación política y analizar sus prácticas y racionalidad. Intentamos demostrar así la importancia de los factores políticos locales en las vinculaciones entre estado, empresa y población.Este trabalho indaga nas instâncias de mediação que intervêm em processos econômicos de grande escala e sua posta em prática local. Baseando-nos no conflito no Cerro de San Pedro (San Luis Potosí, México entre a empresa Minera San Xavier e a Frente Amplio Opositor (FAO aplicamos o método etnográfico pra descrever as estruturas de mediação política locais e analisar suas práticas e racionalidade. Tenta-se demonstrar assim a importância dos fatores políticos locais nas vinculações entre estado, empresa e população.This paper investigates in instances of mediation involved in large-scale economic processes and local implementation. Analyzing the conflict in Cerro de San Pedro (San Luis Potosí, México among San Xavier mining company and the Frente Amplio Opositor (FAO, it applies an ethnographic approach to describe the local structures of political mediation and its practices and rationality. The work shows the relevance of local factors in the relationships between State, company and people.

  5. Utilization of research reactors - A global perspective

    International Nuclear Information System (INIS)

    Muranaka, R.G.

    1988-01-01

    This paper presents 1) a worldwide picture of research reactors, operable, shutdown, under construction and planned, 2) statistics on utilization of research reactors including TRIGA reactors, and 3) some results of a survey conducted during 1988 on the utilization of research reactors in developing Member States in the Asia-Pacific Region

  6. Reactor physics aspects of burning actinides in a nuclear reactor

    International Nuclear Information System (INIS)

    Hage, W.; Schmidt, E.

    1978-01-01

    A short review of the different recycling strategies of actinides other than fuel treated in the literature, is given along with nuclear data requirements for actinide build-up and transmutation studies. The effects of recycling actinides in a nuclear reactor on the flux distribution, the infinite neutron multiplication factor, the reactivity control system, the reactivity coefficients and the delayed neutron fraction are discussed considering a notional LWR or LMFBR as an Actinide Trasmutaton Reactor. Some operational problems of Actinide Transmutation reactors are mentioned, which are caused by the α-decay heat and the neutron sources of Actinide Target Elements

  7. Abadía de San Juan

    Directory of Open Access Journals (Sweden)

    Breuer, Marcel

    1963-09-01

    Full Text Available This abbey is organised in two main zones, one to the south east, consisting of the monastic and ecclesiastical buildings, and another to the north west, comprising the school. The church, the library and the offices are located at the convergence of the two zones. The abbey church is the outstanding feature of the whole project, and it can accommodate 1580 people as well as 360 monks in the choir. The church has been designed around the axis baptistery-altar, the latter occupying a central, separate position, and constituting the focal point of the design. The sacristy forms a link between the monastery and the church. Below the main church there is a small parish crypt with 150 seats, and a chapel for the brethren, seating 104 people, as well as a series of 34 private chapels for the monks to celebrate Mass. The construction of the project features the use of folded reinforced concrete shells for walls and roofs. The types of materials mainly adopted, bare concrete, brick, granite and oak, express the austerity of monastic life. The campanile —a thin slab resting on parabolic supports— is a symbol of our gase towards the world beyond. The church building seeks to identify closely form and function, and is noteworthy also in the choice of spatial and structural Rythm as well as for the wealth of subtle details which it incorporates.En la organización general del conjunto se aprecian dos zonas: la SE., dedicada a los edificios monásticos y eclesiásticos, y la NO., a los edificios escolares. La iglesia, la biblioteca y las oficinas se sitúan en el encuentro de estas dos zonas. El complejo se centra alrededor de la iglesia de la abadía, capaz de albergar una congregación de 1.580 personas y en cuyo coro se prevé espacio para 260 monjes y hermanos. La iglesia, ha sido diseñada alrededor del eje sacramental, baptisterio-altar, el cual aparece en situación central exento, como punto focal. El coro está dividido en dos mitades. La

  8. La selección de contenidos para enseñar naturaleza de la ciencia y tecnología (parte 2: Una revisión desde los currículos de ciencias y la competencia PISA

    Directory of Open Access Journals (Sweden)

    Ángel Vázquez-Alonso

    2012-01-01

    Full Text Available Este estudio revisa los currículos de ciencias (con especial énfasis en el español y la competencia científica de PISA como fuentes de contenidos de aprendizaje correspondientes a la "naturaleza de la ciencia" (y tecnología. Este es continuación de la primera parte donde se expusieron los consensos de la investigación, que se consideran como guías transversales del currículo. El propósito es proponer un marco de referencia que ilumine, contextualice y clarifique el sentido global de la enseñanza de la naturaleza de la ciencia a la luz de los contenidos de los currículos de ciencias españoles actuales. Primero, se presentan las contribuciones de algunos currículos extranjeros para identificar los contenidos consensuados que plantean. Segundo, se presenta la perspectiva y aportaciones de la competencia científica, desde los marcos de referencia de PISA y la competencia sobre conocimiento e interacción con el mundo físico. Tercero, se identifican los contenidos para la enseñanza de la naturaleza de la ciencia (y tecnología presentes en el currículo español de la educación secundaria y el bachillerato y se analiza su diseño, organización y sentido en el marco curricular español. Finalmente, se discuten las fortalezas y debilidades del marco curricular y se diagnostican las dificultades de la didáctica de estas cuestiones innovadoras sobre naturaleza de la ciencia (y tecnología, de modo que se pongan las bases que motiven, conciencien y ayuden al profesorado a superar las dificultades.

  9. Convento di San Francesco a Folloni

    DEFF Research Database (Denmark)

    Torino, Marielva; Boldsen, Jesper L.; Tarp, Peter

    2015-01-01

    than other Italians from the same time, and it seems that tuberculosis was more prevalent than leprosy. Isotopic measurements show a mixed agricultural and pastoral diet and none of the individuals were consuming marine protein. Based on the trace element analysis it seems that the people resided...

  10. Bildungskrise – PISA and the German Educational Crisis

    Directory of Open Access Journals (Sweden)

    Wolfgang Odendahl

    2017-03-01

    Full Text Available After consistently bad results in every PISA test (Programme for International Student Assessment and an accompanying prediction of lack of skills in its future workforce, Germany might be on track for losing out in international competition. Because of PISA’s overwhelming marketing presence, its results are a major political influence. The OECD PISA committee’s recommendations based on the results are challenging the fundamental structure of Germany’s three-tiered educational system, aiming to eliminate its segregational effects on social classes. In order to analyze PISA’s effects on German society from the angle of educational policy, this study compares the goals stated in its documentation with its effects on the public perception of Germany’s future workforce. Three fields of research are considered: Education as a concept for furthering society as a whole, assessment logic, and the educational system as a functional module of the nation state. The study will show that PISA’s test results are valid in indicating an urgent necessity to improve the teaching of basic skills, such as mathematics, reading, and writing. The interpretations of and recommendations based on these results, however, are reflecting a solely utilitarian view of educational systems as supplying human resources for industry.

  11. Los modelos de teoría de colas, propuesta de abordaje en una asignatura optativa de grado

    OpenAIRE

    Mariño, Sonia I.; Alfonzo, Pedro L.

    2016-01-01

    [4 p.] il. Se presenta una propuesta de aprendizaje destinada a los alumnos de la asignatura optativa Modelos y Simulación de la carrera Licenciatura en Sistemas de la UNNE. El uso de las TIC y la multiplicidad de herramientas orientadas para facilitar el manejo, el acceso y la difusión de la información evolucionaron plasmándose en una diversidad de soluciones tecnológicas, siendo uno de ellos los sistemas de colas. El estudio de modelos basados en la Teoría de Colas radica en generar ...

  12. Reglas generales de acentuación en octavo grado de Educación a Distancia en la comunidad Dipina, Waslala, 2016

    Directory of Open Access Journals (Sweden)

    Eddlyn Antonia Granados Gómez

    2017-01-01

    Full Text Available La investigación se realizó en el centro escolar “Isabel Amador”, comunidad Dipina central de la Ciudad de Waslala, Región Autónoma Costa Caribe Norte (RACCN. Se ha diagnosticado la problemática que incide en la aplicación de reglas generales de acentuación en octavo grado de educación a distancia; el diseño de un plan de acción que facilite el aprendizaje, la aplicación de las reglas generales de acentuación e implementación de las estrategias metodológicas innovadoras. La población fue de 40 estudiantes más 2 investigadores y la muestra, 20 docentes. Los instrumentos utilizados fueron entrevistas y revisión documental de las diferentes estrategias implementadas: análisis y sopas de palabras, el pastel y círculos estudios. Se verificó los factores negativos que inciden en los aprendientes: falta de interés y hábitos de lectoescritura, por ende, ausencia de la práctica de las reglas generales de acentuación. La población estudiantil, presentan dificultades en todos los ítems que se evaluaron y se relacionan con dificultades en la conceptualización de palabras agudas, graves, esdrújulas y sobreesdrújulas con un porcentaje de desaprobados del 90% al inicio (diagnóstico y una disminución hasta el 15% al finalizar la investigación. En docentes se cotejó la ausencia del uso de estrategias innovadoras.

  13. INVESTIGACIÓN DE POST GRADO PARA EL CAMBIO EN LA CONTADURÍA LATINO­AMERICANA

    OpenAIRE

    Gil, Jorge

    2014-01-01

    América Latina se debate hoy en un momento histórico en el que confluyen tanto circunstancias internas (debilidad de sus estructuras productivas, articulación dependiente de decisiones políticas extraregionales, falta de productividad, marginalidad e inequitativa distribución de la riqueza, entre otras) como exógenas (revolución tecnológica, redistribución política y económica por la reconversión del Norte socialista, nuevas dimensiones en los mercados financieros). A los problemas tradiciona...

  14. Grados de obturación alcanzados por emisores a lo largo de un tiempo trabajando con aguas residuales depuradas

    OpenAIRE

    Chica Moreno, Rosa Mª; Roldán Cañas, José; Alcaide García, Miguel

    2001-01-01

    Tanto el respeto al medio ambiente como la necesidad de buscar nuevos recursos hídricos está promoviendo la reutilización de aguas residuales utilizando sistemas de riego por goteo, garantizando con un buen manejo y aplicación un uso eficiente del recurso agua. Para conocer el principal problema que se plantea en estos sistemas, como es la obstrucción de los emisores, se ha llevado a cabo este trabajo. Se han estudiado los emisores que son más aptos para resistir al atascamiento, para ello...

  15. Estudio sobre la construcción autorregulada del portafolio en el grado de Enfermería

    Directory of Open Access Journals (Sweden)

    Bernat C. Serdà-Ferrer

    Full Text Available Introducción: Este estudio presenta el proceso de implementación del portafolio en el transcurso de cuatro cursos académicos consecutivos (2006-2010. La planificación incluye tres fases (iniciación, desarrollo y consolidación. La muestra es de 480 estudiantes del primer curso de Enfermería de la Universitat de Girona. El objetivo consiste en evaluar la eficacia del instrumento y construirlo de una forma autorregulada. Sujetos y métodos: La propuesta metodológica se basa en la triangulación secuencial entre métodos, en que para el estudio de una misma unidad empírica se combinan dos estrategias de investigación, una cuantitativa y otra cualitativa. Estudio 1: cuantitativo, descriptivo, longitudinal y prospectivo. Para el análisis estadístico de los datos apareados en las variables continuas que siguen una distribución normal, se utiliza el test t de Student. Para el estudio de la correlación entre dos variables numéricas se ha calculado el índice de correlación P de Pearson. Estudio 2: cualitativo, utiliza grupos de discusión a partir de tópicos. Para el análisis de datos textuales se usa el programa informático Atlas.ti. Resultados: La nota final de los estudiantes que elaboran el portafolio (7,78 es superior a la nota de los estudiantes que no lo realizan (7 (p ≤ 0,001. Se identifica una correlación significativa entre la nota portafolio y la nota final (p ≤ 0,001. El estudio de la tendencia muestra una mayor sensibilidad del instrumento en la evaluación. Conclusión: El diseño final del portafolio se caracteriza por ser mixto, flexible y fomenta la reflexión, empoderando al estudiante en el continuo de aprendizaje.

  16. ATFSR: a small torsatron reactor

    International Nuclear Information System (INIS)

    Houlberg, W.A.; Lacatski, J.T.; Uckan, N.A.

    1985-01-01

    A small (average minor radius anti a approx. = 1 m), moderate-aspect-ratio torsatron reactor based on the Advanced Toroidal Facility (ATF) is proposed as a starting point for improved stellarator reactor designs. The major limitation of the compact size is the lack of space under the helical coils for the blanket and shield. Neoclassical confinement models for helically trapped particles show that a large electric potential (radial electric field) is necessary to achieve ignition in a device of this size, although high-Q operation is still attainable with more modest potentials

  17. STARFIRE: a commercial tokamak reactor

    International Nuclear Information System (INIS)

    1979-12-01

    The purpose of this document is to provide an interim status report on the STARFIRE project for the period of May to September 1979. The basic objective of the STARFIRE project is to develop a design concept for a commercial tokamak fusion electric power plant based on the deuterium/tritium/lithium fuel cycle. The key technical objective is to develop the best embodiment of the tokamak as a power reactor consistent with credible engineering solutions to design problems. Another key goal of the project is to give careful attention to the safety and environmental features of a commercial fusion reactor

  18. Low-Performing Students: Why They Fall Behind and How to Help Them Succeed. PISA

    Science.gov (United States)

    OECD Publishing, 2016

    2016-01-01

    There is no country or economy participating in PISA 2012 that can claim that all of its 15-year-old students have achieved a baseline level of proficiency in mathematics, reading and science. Poor performance at school has long-term consequences, both for the individual and for society as a whole. Reducing the number of low-performing students is…

  19. PISA 2015 Results: Students' Financial Literacy. Volume IV

    Science.gov (United States)

    OECD Publishing, 2017

    2017-01-01

    The OECD Programme for International Student Assessment (PISA) examines not just what students know in science, reading and mathematics, but what they can do with what they know. Results from PISA show educators and policy makers the quality and equity of learning outcomes achieved elsewhere, and allow them to learn from the policies and practices…

  20. The Danger of Inadequate Conceptualisation in PISA for Education Policy

    Science.gov (United States)

    Gaber, Slavko; Cankar, Gregor; Umek, Ljubica Marjanovic; Tasner, Veronika

    2012-01-01

    Due to the broad acceptance of the Programme for International Student Assessment (PISA) and other comparative studies as instruments of policymaking, its accuracy is essential. This article attempts to demonstrate omissions in the conceptualisation, and consequently in calculation and interpretation, of one of the central points of PISA 2006 and…

  1. Resonance ionization spectroscopy of Europium The first application of the PISA at ISOLDE-RILIS

    CERN Document Server

    AUTHOR|(CDS)2099873; Marsh, Bruce Alan

    The following work has been carried out at the radioactive ion beam facility ISOLDE at CERN. A compact atomic beam unit named PISA (Photo Ionization Spectroscopy Apparatus) has been implemented as a recent addition to the laboratory of the Resonance Ionization Laser Ion Source (RILIS). The scope of this thesis work was to demonstrate different applications of the PISA, using the existing and highly developed laser setup of the RILIS installation. In a demonstration of the suitability of PISA for ionization scheme development, a new ionization scheme for Europium has been developed. This resulted in the observation of several new autoionizing states and Rydberg series. Through the analysis of the observed Rydberg resonances a refined value of $45734.33(3)(3)$ cm$^{-1}$ for the ionization potential of the europium atom has been determined. In addition this thesis reports on the feasibility of the use of the PISA as a RILIS performance monitoring device during laser ion source operations. Finally the present wor...

  2. Grado de adherencia terapéutica a los fármacos del metabolismo óseo-mineral: ¿toman nuestros pacientes la medicación prescrita?

    Directory of Open Access Journals (Sweden)

    María Nieves Cazorla Santana

    Full Text Available Los fármacos del metabolismo óseo-mineral tienen gran importancia el tratamiento de los pacientes de hemodiálisis, pero desconocemos las preferencias, y el grado de conocimiento de estos fármacos. Los objetivos del estudio fueron conocer el grado de adherencia terapéutica a los fármacos del metabolismo oseo-mineral, e identificar los factores más relevantes que influyen en la adherencia a este tipo de tratamiento. Pacientes y métodos: Se realizó un estudio transversal en un Centro de hemodiálisis, incluyendo 106 pacientes. Utilizamos el cuestionario simplificado de adherencia a la medicación (SMAQ¹ y un cuestionario específico sobre cumplimiento y preferencias, para conocer el grado de adherencia. Resultados: El 37,7% de los pacientes fue incumplidor según el cuestionario SMAQ. De ellos, el 34% no tomaba la medicación a la misma hora (P<0.000, el 5,7% incumplía el tratamiento los fines de semana (P<0.010, el 13,2% dejan de tomar la medicación cuando se encuentran mal (P<0.010; y en la última semana, el 18% reconocía que olvidó el tratamiento 1día (P= 0.001 y entre 2-3días (12,5%. El 52% no tiene preferencias por ningún quelante del fósforo y el 60.4% conocía la utilidad de los mismos. La principal razón de desagrado fue el aumento del consumo de agua (16%, seguido del tamaño del comprimido (15% y el carbonato de lantano es el fármaco que menos les gusta. Finalmente, el 91% reconoce recibir información dietética. Conclusiones: Como conclusión de nuestro estudio, el 37,7% de los pacientes en programa de hemodiálisis de nuestro centro, fue no adherente al tratamiento médico prescrito, según las respuestas obtenidas en el cuestionario SMAQ, y que el grado de conocimiento, información y/o compresión sobre el tratamiento médico-dietético prescrito a los pacientes son factores muy importantes para mejorar el grado de cumplimiento, por lo que la implicación activa el personal de enfermería constituye una

  3. Key Insights from PISA 2015 for the UK Nations. NFER Education Briefings

    Science.gov (United States)

    National Foundation for Educational Research, 2016

    2016-01-01

    The Programme for International Student Assessment (PISA) is a worldwide research project involving schools and students in over 70 countries. It is run by the Organisation for Economic Co-operation and Development (OECD), takes place every three years, and is designed to examine how 15-year-olds can apply what they have learned in school to real…

  4. Issues with PISA's Use of Its Data in the Context of International Education Policy Convergence

    Science.gov (United States)

    Murphy, Dan

    2014-01-01

    In its analysis of data it collected in 2006, the Programme for International Student Assessment (PISA) survey by the Organisation for Economic Co-operation and Development (OECD) used a variety of statistical methods to arrive at the 'key findings' that school autonomy, school competition and the public posting of student achievement data were…

  5. Comparing the Similarities and Differences of PISA 2003 and TIMSS. OECD Education Working Papers, No. 32

    Science.gov (United States)

    Wu, Margaret

    2010-01-01

    This paper makes an in-depth comparison of the PISA (OECD) and TIMSS (IEA) mathematics assessments conducted in 2003. First, a comparison of survey methodologies is presented, followed by an examination of the mathematics frameworks in the two studies. The methodologies and the frameworks in the two studies form the basis for providing…

  6. Mathematics Curriculum in Ireland: The Influence of PISA on the Development of Project Maths

    Science.gov (United States)

    Kirwan, Liz

    2015-01-01

    This article interrogates the extent to which the Organization for Economic Cooperation and Development (OECD) through its Programme for International Student Assessment (PISA) influenced the development of Project Maths, a new second-level mathematics education policy in Ireland. It argues that the Irish government, in its revision of mathematics…

  7. The Use (and Misuse) of PISA in Guiding Policy Reform: The Case of Spain

    Science.gov (United States)

    Choi, Álvaro; Jerrim, John

    2016-01-01

    In 2013 Spain introduced a series of educational reforms explicitly inspired by the Programme for International Student Assessment (PISA) 2012 results. These reforms were mainly implemented in secondary education--based upon the assumption that this is where Spain's educational problems lie. This paper questions this assumption by attempting to…

  8. Problems in Deriving Italian Regional Differences in Intelligence from 2009 PISA Data

    Science.gov (United States)

    Cornoldi, Cesare; Giofre, David; Martini, Angela

    2013-01-01

    Recent results of international assessment programs (e.g., PISA) have shown a large difference in high school students' performance between northern and southern Italy. On this basis, it has been argued that the discrepancy reflects differences in average intelligence of the inhabitants of regions and is associated with genetic factors ( and ).…

  9. Science Literacy: How do High School Students Solve PISA Test Items?

    Science.gov (United States)

    Wati, F.; Sinaga, P.; Priyandoko, D.

    2017-09-01

    The Programme for International Students Assessment (PISA) does assess students’ science literacy in a real-life contexts and wide variety of situation. Therefore, the results do not provide adequate information for the teacher to excavate students’ science literacy because the range of materials taught at schools depends on the curriculum used. This study aims to investigate the way how junior high school students in Indonesia solve PISA test items. Data was collected by using PISA test items in greenhouse unit employed to 36 students of 9th grade. Students’ answer was analyzed qualitatively for each item based on competence tested in the problem. The way how students answer the problem exhibits their ability in particular competence which is influenced by a number of factors. Those are students’ unfamiliarity with test construction, low performance on reading, low in connecting available information and question, and limitation on expressing their ideas effectively and easy-read. As the effort, selected PISA test items can be used in accordance teaching topic taught to familiarize students with science literacy.

  10. An Analysis of Students Error In Solving PISA 2012 And Its Scaffolding

    Directory of Open Access Journals (Sweden)

    Yurizka Melia Sari

    2017-08-01

    Full Text Available Based on PISA survey in 2012, Indonesia was only placed on 64 out of 65 participating countries. The survey suggest that the students’ ability of reasoning, spatial orientation, and problem solving are lower compare with other participants countries, especially in Shouth East Asia. Nevertheless, the result of PISA does not elicit clearly on the students’ inability in solving PISA problem such as the location and the types of student’s errors. Therefore, analyzing students’ error in solving PISA problem would be essential countermeasure to help the students in solving mathematics problems and to develop scaffolding. Based on the data analysis, it is found that there are 5 types of error which is made by the subject. They consist of reading error, comprehension error, transformation error, process skill error, and encoding error. The most common mistake that subject do is encoding error with a percentage of 26%. While reading is the fewest errors made by the subjects that is only 12%. The types of given scaffolding was explaining the problem carefully and making a summary of new words and find the meaning of them, restructuring problem-solving strategies and reviewing the results of the completion of the problem.

  11. Sodium as a reactor coolant

    International Nuclear Information System (INIS)

    Cesar, S.B.G.

    1989-01-01

    This work is related to the use of sodium as a reactor coolant, to the advantages and problems related to its use, its mechanical, thermophysics, eletronical, magnetic and nuclear properties. It is mainly a bibliographic review, with the aim of gathering the necessary information to persons initiating in the study of sodium and also as reference source. (author) [pt

  12. Pulsed reactors: A dissenting view

    International Nuclear Information System (INIS)

    Ganev, I.Kh.; Orlov, V.V.

    1995-01-01

    The preceding article, by G.A. Ivanov et al., contains interesting estimates of the expanded production of plutonium in thermonuclear explosions initiated by plutonium charges. It must be noted that more than 40 years of efforts, despite some technical successes, have not led to a fast-reactor technology suitable for large-scale power production. This explains the incessant search for a nuclear technology for the future and the renewed interest in accelerator, hybrid, and explosive approaches to plutonium production. The success of such efforts will depend largely on the formulation of goals and the choice of the principal criteria. It is appropriate to discuss these issues here because the adoption of the rate of plutonium production or the plutonium doubling time as the principal criterion sets the stage for the repetition of previous errors. However, as a preliminary, I would like to question some categorical assertions that were made by Ivanov et al. without the presentation of adequate supporting data (the assertions that open-quotes the creation of an power industry on the basis of ordinary breeder reactors is practically impossibleclose quotes and that open-quotes adequate power generation in the 21st centuryclose quotes is impossible). In fact, it is simple to calculate that, given a realistic doubling time for fast reactors of ∼10 years and the plutonium produced by thermal reactors (around 10 12 W), it would be possible, if so desired, to introduce power far exceeding 10 14 W in the 21st century

  13. Fomento del desarrollo del pensamiento crítico en estudiantes de grado décimo desde situaciones cotidianas en la asignatura de Filosofía

    Directory of Open Access Journals (Sweden)

    José Miguel Lara Rodríguez

    2016-12-01

    Full Text Available Resumen Este artículo presenta el fomento del desarrollo del pensamiento crítico en estudiantes de grado décimo B del Instituto de Educación Distrital Técnico Jesús Maestro, que dirige Fe y Alegría de Barranquilla (Colombia, mediante la atención a situaciones cotidianas en la asignatura de Filosofía, implementando la metodología investigación-acción. Esta investigación encontró en dichos estudiantes deficiencias de pensamiento crítico, que se evidencian en temas propios de la asignatura de Filosofía. Se ideó fomentar el desarrollo del pensamiento crítico en los estudiantes atendiendo una situación cotidiana relacionada con un tema filosófico. Se aplicó un instrumento diagnóstico que evaluó las habilidades: interpretación, análisis y explicación, en relación con una situación cotidiana, cuyos resultados tuvieron un nivel bajo. Posteriormente se aplicaron estrategias para mejorar estas habilidades y, en general, el problema detectado. Finalmente se ejecutó un instrumento diagnóstico, similar al inicial, que evidenció mejoría en los estudiantes, pues pasaron de un nivel bajo a básico. Abstract This article presents the results of a descriptive research work with Third semester students of different academic programs of a private university, whose main objective consisted in describing its learning auto regulation. The sample includes 130 students chosen at random stratified from a population of 370. The instrument used was the MSLQ (MotivatedStrategiesforLearningQuestionnaire designed by Pintrich, Smith, García y McKeachie (1991 translated into Spanish. The results indicate that students in its majority have metacognositive strategy levels over the media, although there are some program differences.  In the case of Medicine, it has been observed that the highest grading were for nearly all the dimensions of evaluated auto regulation, however, in these students higher levels of anxiety were found in relation to

  14. Digital computer operation of a nuclear reactor

    International Nuclear Information System (INIS)

    Colley, R.W.

    1984-01-01

    A method is described for the safe operation of a complex system such as a nuclear reactor using a digital computer. The computer is supplied with a data base containing a list of the safe state of the reactor and a list of operating instructions for achieving a safe state when the actual state of the reactor does not correspond to a listed safe state, the computer selects operating instructions to return the reactor to a safe state

  15. TIPOLOGÍA Y GRADO DE PREJUICIO DE UN GRUPO DE ESPAÑOLES HACIA EL COLECTIVO COLOMBIANO. UNA LECTURA CON PERSPECTIVA DE GÉNERO

    Directory of Open Access Journals (Sweden)

    Daniela Herrera Rubalcaba

    2015-06-01

    Full Text Available La presente investigación identifi ca la tipología y el grado de prejuicio que un grupo de españoles, residente en la provincia de Almería (España, presenta hacia el colectivo de inmigrantes colombianos. Para recabar la información se contactó a 16 mujeres y 14 hombres que respondían a la escala de Pettigrew y Meertens (1995, adaptada por Rueda; Navas y Gómez (1995 y Rueda y Navas (1996. En una lectura con perspectiva de género de las respuestas se observa que, en este contexto de migración y multiculturalidad, más de la mitad de mujeres y hombres del total de participantes se presenta en la misma proporción como personas “igualitarias”. El resto, seis españolas y cuatro españoles, presentan prejuicio sutil hacia el colectivo colombiano. En esta investigación ni mujeres ni hombres se pueden identifi car como “fanáticos”. Los resultados se discuten en relación con los encontrados en otras investigaciones. AbstractThis research paper aims to identify typology and prejudice based on information using a group of Spanish people who live in Almería (Spain, in relation to a group of Colombian immigrants. In order to support this information, sixteen women and fourteen men who responded to Pettigrew & Meertens Scale (1995, and adapted by Rueda et al. (1995 and Rueda & Navas (1996, were used as a sample. The answers, based on gender perspective, showed that more than half of the total men and women are presented in the same proportion as “egalitarian”. The rest of the people, six Spanish males and four Spanish females, presented subtle prejudice towards Colombians. So, in this research project neither women, nor men can be identifi ed as “fanatic”. The results also are controversial in relation with the ones found in other studies.

  16. Nueva estructura para la enseñanza-aprendizaje de la materia de enfermería clínica en los estudios de Grado de Enfermería

    Directory of Open Access Journals (Sweden)

    Anna Falcó-Pegueroles

    Full Text Available En el Grado de Enfermería, los cambios requeridos para la adaptación al Espacio Europeo de Educación Superior se han orientado a la introducción de novedades metodológicas que han propiciado la génesis de nuevos enfoques para la enseñanza y el aprendizaje, con el objetivo último de disminuir los desajustes que en algunas ocasiones se han detectado entre la teoría y la práctica. En esta línea, partiendo de las necesidades actuales de la formación en relación a la materia de enfermería clínica del grado y de las competencias profesionales, se inició un proceso de reflexión y análisis que originó una nueva estructura organizativa de la materia. Este nuevo enfoque nace con el objetivo fundamental de mejorar la docencia de la enfermería clínica, actualizando la forma de enseñar la enfermería y los cuidados enfermeros. Lejos del modelo biomédico centrado en la enfermedad que ha imperado hasta ahora, el nuevo enfoque parte de una visión profundamente enfermera y, en consecuencia, hace explícitos los cuidados de la persona con un trastorno real o potencial de la salud. Los resultados de la implementación de esta nueva estructura en la asignatura 'Enfermería clínica I' de segundo curso de grado ponen de manifiesto que hay una mejora en la precisión diagnóstica y en la etapa de planificación del proceso enfermero, así como en la identificación de la responsabilidad profesional en los ejes autónomo e interdisciplinar.

  17. The San Diego Panasonic Partnership: A Case Study in Restructuring.

    Science.gov (United States)

    Holzman, Michael; Tewel, Kenneth J.

    1992-01-01

    The Panasonic Foundation provides resources for restructuring school districts. The article examines its partnership with the San Diego City School District, highlighting four schools that demonstrate promising practices and guiding principles. It describes recent partnership work on systemic issues, noting the next steps to be taken in San Diego.…

  18. Comparación del gasto energético en reposo determinado mediante calorimetría indirecta y estimado mediante fórmulas predictivas en mujeres con grados de obesidad I a III

    OpenAIRE

    Alicia Parra-Carriedo; Loren Cherem-Cherem; Daniela Galindo-De Noriega; Mary Carmen Díaz-Gutiérrez; Ana Bertha Pérez-Lizaur; César Hernández-Guerrero

    2013-01-01

    Introducción: La determinación del gasto energético en reposo (GER) se calcula cotidianamente a partir de fórmulas predictivas aunque el resultado varía dependiendo de la población. Objetivo: Comparar la determinación del GER mediante calorimetría indirecta y mediante las ecuaciones Harris-Benedict (HB), Mifflin (MF), Organización Mundial de la Salud (OMS), "Institute of Medicine" (IOM), Fórmula Rápida (FR) y Valencia (VA) en mujeres con grados de obesidad I a III. Métodos: Mujeres adultas me...

  19. Design of a TOF-SANS instrument for the proposed long wavelength target station at the spallation neutron source

    International Nuclear Information System (INIS)

    Thiyagarajan, P.; Littrell, K.; Seeger, P.A.

    2001-01-01

    We have designed a versatile high-throughput SANS instrument [Broad Range Intense Multipurpose SANS (BRIMS)] for the proposed Long Wavelength Target Station at the SNS by using acceptance diagrams and the Los Alamos NISP Monte Carlo simulation package. This instrument has been fully optimized to take advantage of the 10 Hz source frequency (broad wavelength bandwidth) and the cold neutron spectrum from a tall coupled solid methane moderator (12 cm x 20 cm). BRIMS has been designed to produce data in a Q range spanning from 0.0025 to 0.7 A -1 in a single measurement by simultaneously using neutrons with wavelengths ranging from 1 to 14.5 A in a time of flight mode. A supermirror guide and bender assembly is employed to separate and redirect the useful portion of the neutron spectrum with λ>1 A, by 2.3deg away from the direct beam containing high energy neutrons and γ rays. The effects of various collimation choices on count rate, resolution and Q min have been characterized using spherical particle and delta function scatterers. The overall performance of BRIMS has been compared with that of the best existing reactor-based SANS instrument D22 at ILL. (author)

  20. Implementación de las tics como estrategia didáctica para generar un aprendizaje significativo de los procesos celulares en los estudiantes de grado sexto de la institución educativa San Andrés del municipio de Girardota

    OpenAIRE

    Monsalve Ochoa, Martha Lía

    2012-01-01

    Esta práctica docente se hizo con el objetivo de aplicar herramientas TIC a una serie de estudiantes de la institución educativa san Andrés de la vereda del mismo nombre del municipio de Girardota. Son jóvenes entre 11 y 15 años de escasos recursos en su mayoría, con poco apoyo de sus padres para la motivación hacia el estudio, en la institución no se cuenta con laboratorio ni material alguno para la práctica de las ciencias. No son jóvenes que le vean mucha importancia a esta área porque nin...

  1. Factores asociados a la disponibilidad y uso de medios electrónicos en niños desde preescolar hasta 4° grado

    Directory of Open Access Journals (Sweden)

    Diana Marina Camargo

    2013-06-01

    Full Text Available Introducción. El incremento en la disponibilidad de medios electrónicos ha modificado los comportamientos de niños y jóvenes, fomentando los de tipo sedentario, con efectos sobre la saluddesde muy corta edad. Objetivo. Caracterizar la disponibilidad y uso de medios electrónicos, y sus factores asociados, en niños desde preescolar hasta 4° grado. Materiales y métodos. Es un estudio de corte transversal con muestreo por conglomerados. Los padres diligenciaron la encuesta sociodemográfica, disponibilidad y uso de medios electrónicos enel hogar y en la habitación del niño. Se aplicaron modelos de regresión log-binomial para estimar lasrazones de prevalencia, ajustando por el tipo de muestreo. Resultados. Respondieron 710 padres. El promedio de edad de los niños fue de 6,7 años y 49,7 % eran hombres. El trabajo fuera de la casa de la mamá y los ingresos familiares se asociaron positivamente con la disponibilidad de medios electrónicos en el hogar y en la habitación del hijo. La disponibilidad detelevisor, computador y consolas en la habitación del hijo, favorece un mayor tiempo de uso de estos medios electrónicos. Tanto el sexo masculino del hijo como la edad, se asociaron positivamente con la disponibilidad y uso de los medios electrónicos. Conclusión. Este es el primer estudio en Colombia en que se documentan la disponibilidad y el uso de medios electrónicos en niños. Los hallazgos reflejan que la vida moderna fomenta comportamientos sedentarios desde los primeros años de vida, asociados con problemas de salud desde la primera infancia. Se requieren estudios de intervención dirigidos a disminuir estos comportamientos en nuestro contexto.   http://dx.doi.org/10.7705/biomedica.v33i2.779

  2. Análisis comparativo de meningiomas cerebrales Grado I vs Grado II en una serie retrospectiva de 63 pacientes operados

    Science.gov (United States)

    Coppola, Federico; Campbell, Juan Iaconis; Herrero, Juan Manuel; Volpe, Emilio; Cersosimo, Tito

    2017-01-01

    Resumen Introducción: Los meningiomas Grado II tienen un comportamiento biológico más agresivo que los Grado I. A partir del año 2007, con los nuevos criterios de clasificación, la incidencia de meningiomas atípicos reportada aumentó hasta un 35%. Objetivo: Establecer diferencias entre los Meningiomas Grado I y II de la clasificación de la OMS, en lo que respecta a: grados de resección de Simpson, localización tumoral, necesidad de reintervención, tratamiento adyuvante, evolución y mortalidad. Métodos: Estudio retrospectivo de 63 pacientes operados entre el periodo 2009-2015. Variables analizadas: sexo, edad, grado histológico, localización, grado de resección quirúrgica, radioterapia adyuvante, mortalidad y evolución. Resultados: Se analizaron 63 pacientes: 51 Grado I y 12 Grado II de la clasificación de la OMS. La distribución por sexo no mostró diferencias entre meningiomas benignos y atípicos. Tampoco el grupo etario de presentación; mediana de 57 años. Un 55% de los meningiomas benignos se localizaron fuera de la base del cráneo versus el 91,6% de los meningiomas atípicos (P = 0.02). En el 74,5% de los meningiomas benignos se logró una resección total (Simpson I-II-III) versus el 58.3% para los atípicos (P = 0.3). Se reintervinieron el 33,3% de meningiomas atípicos en comparación con el 9.8% de los benignos (P = 0.03). Tuvieron una buena evolución el 86,2% de los benignos vs el 53,8% de los GII (P = 0.01). Realizaron radioterapia adyuvante el 33,3% de los meningiomas Grado II vs el 1,9% de los Grado I. Conclusiones: Los meningiomas atípicos cerebrales tienen peor pronóstico evolutivo que los Grado I de la OMS. Presentan una mayor tasa de reintervención y se localizan más frecuentemente fuera de la base del cráneo. La localización pareciera ser un factor de riesgo para el desarrollo de meningiomas atípicos. PMID:29142779

  3. Auxiliary reactor for a hydrocarbon reforming system

    Science.gov (United States)

    Clawson, Lawrence G.; Dorson, Matthew H.; Mitchell, William L.; Nowicki, Brian J.; Bentley, Jeffrey M.; Davis, Robert; Rumsey, Jennifer W.

    2006-01-17

    An auxiliary reactor for use with a reformer reactor having at least one reaction zone, and including a burner for burning fuel and creating a heated auxiliary reactor gas stream, and heat exchanger for transferring heat from auxiliary reactor gas stream and heat transfer medium, preferably two-phase water, to reformer reaction zone. Auxiliary reactor may include first cylindrical wall defining a chamber for burning fuel and creating a heated auxiliary reactor gas stream, the chamber having an inlet end, an outlet end, a second cylindrical wall surrounding first wall and a second annular chamber there between. The reactor being configured so heated auxiliary reactor gas flows out the outlet end and into and through second annular chamber and conduit which is disposed in second annular chamber, the conduit adapted to carry heat transfer medium and being connectable to reformer reaction zone for additional heat exchange.

  4. Una lucha a "cielo abierto" : el caso del Frente Amplio Opositor a Minera San Xavier

    OpenAIRE

    Lamberti, María Julieta

    2010-01-01

    Se presenta un estudio de caso de un conflicto ecológico distributivo por la instalación de una empresa minera de tajo a cielo abierto desde la perspectiva de uno de los actores involucrados, el Frente Amplio Opositor a Minera San Xavier en Cerro de San Pedro, San Luis Potosí. Para dar cuenta del sentido que le otorgan los miembros del FAO a la instalación de la empresa en la comunidad se utilizan los procesos de enmarcado como herramienta de interpretación. I. La interpretación de los con...

  5. Lateral restraint assembly in a nuclear reactor

    International Nuclear Information System (INIS)

    Brown, S.J.; Gorholt, W.

    1977-01-01

    A lateral restraint assembly is described for a reactor of, for example, the high temperature gas-cooled type which commonly includes a reactor core of relatively complex construction supported within a shell or vessel providing a shielded cavity for containing the reactor core. (U.K.)

  6. Nuclear reactor with a suspended vessel

    International Nuclear Information System (INIS)

    Lemercier, Guy.

    1977-01-01

    This invention relates to a nuclear reactor with a suspended vessel and applies in particular when this is a fast reactor, the core or active part of the reactor being inside the vessel and immersed under a suitable volume of flowing liquid metal to cool it by extracting the calories released by the nuclear fission in the fuel assemblies forming this core [fr

  7. RA Reactor applications, Annex A

    International Nuclear Information System (INIS)

    Cupac, S.; Vukadin, Z.

    2000-01-01

    Full text: In 2000 Ra reactor was not operated. New instrumentation is not complete, without it, it is not possible to think about reactor start-up. Since 1985, when reactor operation was forbidden, there are 480 fuel elements left in 48 fuel channels in the reactor core. Heavy water was removed from the reactor core because of the repair of the heavy water pumps in 1986. The old instrumentation was removed. Eleven years after being left to its own destiny, it would be difficult to imagine that anybody would think of reactor restart without examining the state of reactor vessel and other vital reactor components. Maintaining the reactor under existing conditions without final decision about restart or permanent shutdown is destructive for this nuclear facility. The existing state that pertains for more than 10 years would have only one result, destruction of the RA reactor [sr

  8. RA Reactor applications, Annex A

    International Nuclear Information System (INIS)

    Cupac, S.; Vukadin, Z.

    1998-01-01

    Full text: In 1998 Ra reactor was not operated. New instrumentation is not complete, without it, it is not possible to think about reactor start-up. Since 1985, when reactor operation was forbidden, there are 480 fuel elements left in 48 fuel channels in the reactor core. Heavy water was removed from the reactor core because of the repair of the heavy water pumps in 1986. The old instrumentation was removed. Eleven years after being left to its own destiny, it would be difficult to imagine that anybody would think of reactor restart without examining the state of reactor vessel and other vital reactor components. Maintaining the reactor under existing conditions without final decision about restart or permanent shutdown is destructive for this nuclear facility. The existing state that pertains for more than 10 years would have only one result, destruction of the RA reactor [sr

  9. RA Reactor applications, Annex A

    International Nuclear Information System (INIS)

    Cupac, S.; Vukadin, Z.

    1996-01-01

    Full text: In 2000 Ra reactor was not operated. New instrumentation is not complete, without it, it is not possible to think about reactor start-up. Since 1985, when reactor operation was forbidden, there are 480 fuel elements left in 48 fuel channels in the reactor core. Heavy water was removed from the reactor core because of the repair of the heavy water pumps in 1986. The old instrumentation was removed. Eleven years after being left to its own destiny, it would be difficult to imagine that anybody would think of reactor restart without examining the state of reactor vessel and other vital reactor components. Maintaining the reactor under existing conditions without final decision about restart or permanent shutdown is destructive for this nuclear facility. The existing state that pertains for more than 10 years would have only one result, destruction of the RA reactor [sr

  10. The measures of the castle San Felice a Cancello

    Directory of Open Access Journals (Sweden)

    Adriana Rossi

    2015-07-01

    Full Text Available  Geometric logic characterizes the function and standard structure of the castles built under Frederick II: a square form with four square towers inserted at the summit. Any changes made have been few and slight, all intended to optimize the adaption of the structure to the site. However, the Matinale Castle in San Felice a Cancello, province of Caserta, in the region of Campania, represents an innovative exception. The study of the ruins confirms a rather singular guiding principle: the position and shape of the foundations of the towers allowed them to halve the number of the inevitable sectors used for flank defence. This solution anticipates by more than two centuries the advent of the bastion, the key element of the trace italienne or star fort. In order to fully comprehend this sophisticated concept, unique of its type, for a restoration was made aware of the critical survey.

  11. PISA: números, estandarización de la conducta y la alquimia de las materias escolares

    Directory of Open Access Journals (Sweden)

    Thomas S. Popkewitz

    2013-01-01

    Full Text Available Este artículo examina la red de prácticas que confieren inteligibilidad a la organización del conocimiento de las materias escolares que hace PISA. El programa PISA es tratado como un acontecimiento histórico. Su estudio consiste en hacer visible los principios que ordenan y clasifican los objetos “vistos” y que actúan sobre el “conocimiento práctico” de las materias escolares. La política de PISA, a mi juicio, son los principios que rigen lo que los chicos deberían conocer, cómo ese conocimiento se hace posible, y el estudio de la inclusión y exclusión incorporadas en estas prácticas. La primera parte analiza históricamente la transformación de los números en “hechos”, una presunción que posibilita las comparaciones de PISA. En la segunda parte, dirige la atención a los principios de las materias escolares que ordenan y clasifican los “hechos” de las mediciones de PISA.

  12. A recycling molecular beam reactor

    International Nuclear Information System (INIS)

    Prada-Silva, G.; Haller, G.L.; Fenn, J.B.

    1974-01-01

    In a Recycling Molecular Beam Reactor, RMBR, a beam of reactant gas molecules is formed from a supersonic free jet. After collision with a target the molecules pass through the vacuum pumps and are returned to the nozzle source. Continuous recycling permits the integration of very small reaction probabilities into measurable conversions which can be analyzed by gas chromatography. Some preliminary experiments have been carried out on the isomerization of cyclopropane

  13. Las chicas en PISA y el marcado de casillas. Un examen de la perspectiva de los estudiantes sobre las pruebas PISA

    Directory of Open Access Journals (Sweden)

    Gerry Mac Ruairc

    2013-01-01

    Full Text Available El artículo se mueve desde el análisis a nivel macro a la perspectiva de los estudiantes en las pruebas PISA. Mientras que está empíricamente bien establecido el alto nivel de correlación entre el nivel educativo y el nivel socioeconómico de los estudiantes, en este estudio el autor pretende analizar cómo los estudiantes socio-económicamente desfavorecidos reaccionan a las pruebas y participan en el proceso. Para ello, es importante tener en cuenta los puntos de vista de los propios estudiantes. Al examinar los puntos de vista de los estudiantes en las pruebas de PISA en un estudio de caso, el autor ofrece una visión de cómo un grupo de chicas de clase trabajadora, procedente de una escuela de un área urbana desfavorecida, experimentó en la evaluación PISA (2009 en la República de Irlanda. El análisis temático de las entrevistas y las transcripciones a los grupos focales revelaron dos cuestiones: para la mayoría de los estudiantes, pero especialmente para aquellos con necesidades educativas especiales, se sintieron estresados por el contenido y la dificultad de los ítems; por su parte, los estudiantes se limitaban simplemente a los requisitos exigidos de completar la prueba en el tiempo establecido, con sus implicaciones para su validez. Se concluye con la necesidad de un enfoque más proactivo de apoyo a los estudiantes y un modelo más matizado de la evaluación en las futuras pruebas PISA para tener en cuenta las diferencias de clase social.

  14. Wave attenuation across a tidal marsh in San Francisco Bay

    Science.gov (United States)

    Foster-Martinez, Madeline R.; Lacy, Jessica; Ferner, Matthew C.; Variano, Evan A.

    2018-01-01

    Wave attenuation is a central process in the mechanics of a healthy salt marsh. Understanding how wave attenuation varies with vegetation and hydrodynamic conditions informs models of other marsh processes that are a function of wave energy (e.g. sediment transport) and allows for the incorporation of marshes into coastal protection plans. Here, we examine the evolution of wave height across a tidal salt marsh in San Francisco Bay. Instruments were deployed along a cross-shore transect, starting on the mudflat and crossing through zones dominated by Spartina foliosa and Salicornia pacifica. This dataset is the first to quantify wave attenuation for these vegetation species, which are abundant in the intertidal zone of California estuaries. Measurements were collected in the summer and winter to assess seasonal variation in wave attenuation. Calculated drag coefficients of S. foliosa and S. pacifica were similar, indicating equal amounts of vegetation would lead to similar energy dissipation; however, S. pacifica has much greater biomass close to the bed (<20 cm) and retains biomass throughout the year, and therefore, it causes more total attenuation. S. foliosa dies back in the winter, and waves often grow across this section of the marsh. For both vegetation types, attenuation was greatest for low water depths, when the vegetation was emergent. For both seasons, attenuation rates across S. pacifica were the highest and were greater than published attenuation rates across similar (Spartina alterniflora) salt marshes for the comparable depths. These results can inform designs for marsh restorations and management plans in San Francisco Bay and other estuaries containing these species.

  15. Experiments and Modelling Techniques for Heat and Mass Transfer in Light Water Reactors

    International Nuclear Information System (INIS)

    Ambrosini, W.; Bucci, M.; Forgione, N.; Manfredini, A.; Oriolo, F.

    2009-01-01

    The paper summarizes the lesson learned from theoretical and experimental activities performed at the University of Pisa, Pisa, Italy, in past decades in order to develop a general methodology of analysis of heat and mass transfer phenomena of interest for nuclear reactor applications. An overview of previously published results is proposed, highlighting the rationale at the basis of the performed work and its relevant conclusions. Experimental data from different sources provided information for model development and assessment. They include condensation experiments performed at SIET (Piacenza, Italy) on the PANTHERS prototypical PCCS module, falling film evaporation tests for simulating AP600-like outer shell spraying conditions, performed at the University of Pisa, experimental data concerning condensation on finned tubes, collected by CISE (Piacenza, Italy) in the frame of the INCON EU Project, and experimental tests performed in the CONAN experimental facility installed at the University of Pisa. The experience gained in these activities is critically reviewed and discussed to highlight the relevant obtained conclusions and the perspectives for future work

  16. San Marino.

    Science.gov (United States)

    1985-02-01

    San Marino, an independent republic located in north central Italy, in 1983 had a population of 22,206 growing at an annual rate of .9%. The literacy rate is 97% and the infant mortality rate is 9.6/1000. The terrain is mountainous and the climate is moderate. According to local tradition, San Marino was founded by a Christian stonecutter in the 4th century A.D. as a refuge against religious persecution. Its recorded history began in the 9th century, and it has survived assaults on its independence by the papacy, the Malatesta lords of Rimini, Cesare Borgia, Napoleon, and Mussolini. An 1862 treaty with the newly formed Kingdom of Italy has been periodically renewed and amended. The present government is an alliance between the socialists and communists. San Marino has had its own statutes and governmental institutions since the 11th century. Legislative authority at present is vested in a 60-member unicameral parliament. Executive authority is exercised by the 11-member Congress of State, the members of which head the various administrative departments of the goverment. The posts are divided among the parties which form the coalition government. Judicial authority is partly exercised by Italian magistrates in civil and criminal cases. San Marino's policies are tied to Italy's and political organizations and labor unions active in Italy are also active in San Marino. Since World War II, there has been intense rivalry between 2 political coalitions, the Popular Alliance composed of the Christian Democratic Party and the Independent Social Democratic Party, and the Liberty Committee, coalition of the Communist Party and the Socialist Party. San Marino's gross domestic product was $137 million and its per capita income was $6290 in 1980. The principal economic activities are farming and livestock raising, along with some light manufacturing. Foreign transactions are dominated by tourism. The government derives most of its revenue from the sale of postage stamps to

  17. Starfire: a commercial tokamak reactor

    International Nuclear Information System (INIS)

    Baker, C.C.; Abdou, M.A.; DeFreece, D.A.; Trachsel, C.A.; Graumann, D.; Kokoszenski, J.

    1979-01-01

    The basic objective of the STARFIRE Project is to develop a design concept for a commercial tokamak fusion electric power plant based on the deuterium/tritium/lithium fuel cycle. The key technical objective is to develop the best embodiment of the tokamak as a power reactor consistent with credible engineering solutions to design problems. Another key goal of the project is to give careful attention to the safety and environmental features of a commercial fusion reactor. The STARFIRE Project was initiated in May 1979, with the goal of completing the design study by October 1980. The purpose of this paper is to present an overview of the major parameters and design features that have been tentatively selected for STARFIRE

  18. HACIA UNA MAYOR COMPRENSIÓN GLOBAL DEL RENDIMIENTO ACADÉMICO A TRAVÉS DE LAS PRUEBAS PISA: CONTRASTE DE TRES HIPÓTESIS A PARTIR DE UNOS DATOS EMPÍRICOS

    Directory of Open Access Journals (Sweden)

    Santiago Nieto Martín

    2012-01-01

    Full Text Available El presente artículo trata de analizar y reflexionar comparativamente acerca del rendimiento académico de los alumnos de los países del mundo que aglutinan el mayor porcentaje de riqueza de la economía mundial a través de los resultados obtenidos y reflejados en los Informes PISA. En el estudio llevado a cabo, planteamos tres macro conjeturas o suposiciones que formulamos y contrastamos a modo de hipótesis; la primera, vinculada a la incidencia de variables macroeconómicas y socioeconómicas en el rendimiento de cada una de las pruebas; la segunda, centrada en la estructura del sistema educativo de cada país: sistema estructurado versus sistema diferenciado; y una tercera suposición relacionada con el denominado Estado de bienestar, modelos y su posible repercusión¿ con el fin de comprobar e informar sobre la importancia que pudieran tener en el rendimiento académico de los alumnos de cada país lo que denominamos efectos económico, escolar y social.

  19. San Francisco Bay Multi-beam Bathymetry: Area A

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These multi-beam bathymetric data were collected over shallow subtidal areas in the San Francisco Bay estuary system. Bathymetric and acoustic backscatter data were...

  20. San Francisco Bay Interferometric Side Scan Imagery: Area A

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Backscatter imagery data were collected over shallow subtidal areas in the San Francisco Bay estuary system. Bathymetric and acoustic backscatter data were collected...

  1. Cambios producidos en el aprendizaje de las familias de funciones cuadráticas en estudiantes de grado noveno a través de situaciones didácticas utilizando geogebra

    OpenAIRE

    Insuasty Ossa, Emilse

    2014-01-01

    Este trabajo presenta el análisis de los cambios que se producen en el aprendizaje de las familias de funciones cuadráticas en estudiantes de grado noveno, implementando situaciones didácticas de enseñanza con el software Geogebra y su aplicación para la movilización de saberes en torno a este concepto. La investigación se sustenta a partir de la Teoría de Situaciones Didácticas fundada por el investigador y didacta francés Guy Brousseau (1986), es de tipo cualitativo descriptivo ...

  2. Valoración del rendimiento académico de los alumnos de la Facultad de Educación de la UVA (Segovia en el primer año de implantación de grado

    Directory of Open Access Journals (Sweden)

    José Mª Arribas Estebaranz

    2014-01-01

    Full Text Available El objetivo de este trabajo es doble. Uno: analizar y valorar el rendimiento académico en función de distintas variables -asignatura, profesor, especialidad, convocatoria y género del alumno y del profesor.- de los alumnos de primer curso del Grado de Maestro de las especialidades de Educación Primaria e Infantil en el primer año de implantación de Grado- en la Facultad de Educación de la Universidad de Valladolid (Campus de Segovia. Dos: Inferir de dicho análisis, si las calificaciones obtenidas por los alumnos son manifestación fidedigna del grado de consecución de las competencias generales y específicas y de los resultados de aprendizaje expresados en las memorias de dichas titulaciones.No se observan diferencias significativas en el rendimiento académico de los alumnos en cuanto a la especialidad o el género de los alumnos y profesores; sin embargo, el hecho de que sí existan diferencias significativas en el rendimiento académico de los alumnos en aquellas asignaturas impartidas por distintos profesores, más allá de lo esperable por esta circunstancia y dada la aleatoriedad en la distribución de los grupos, pone a nuestro juicio, en entredicho la representatividad de las calificaciones como manifestación fidedigna de los aprendizajes adquiridos por los estudiantes, prevaleciendo la subjetividad de los criterios de evaluación y calificación del profesor por encima de los contenidos y/o criterios normativamente estipulados.

  3. The Theory of Conjuntos-T and the PISA Test

    Directory of Open Access Journals (Sweden)

    Ricardo J. De Armas Costa

    2018-01-01

    Full Text Available In this article of documented reflection, some elements of a new theory are showed that study how the different agents (teachers, researchers, pedagogues, ... and institutions that are part of the educational system, configure environments for the development of the cognitive abilities of subjects. It is the theory of Conjuntos-T proposed by the authors of the article in mid-2012 to develop students' mathematical skills; the theory that can be generalized to the development of skills in other areas of knowledge. It also illustrates, by way of example, how it can be used to develop basic contemporary skills demanded by modern economies in subjects and that is monitored in several countries by programs such as the PISA from OECD.

  4. GRADO DE SUPERVISIÓN COMO VARIABLE MODERADORA ENTRE LIDERAZGO Y SATISFACCIÓN, MOTIVACIÓN Y CLIMA ORGANIZACIONAL DEGREE OF SUPERVISION AS A MODERATING VARIABLE OF THE RELATION BETWEEN LEADERSHIP AND SATISFACTION, MOTIVATION AND ORGANIZATIONAL CLIMATE

    Directory of Open Access Journals (Sweden)

    Alejandro Adrián Cuadra-Peralta

    2010-04-01

    Full Text Available El objetivo de esta investigación es mostrar el impacto del Grado de Supervisión como variable moderadora de la relación entre liderazgo, motivación, satisfacción y clima organizacional. En este estudio, Grado de Supervisión se conceptualizó como un constructo con dos polos, estrecho o lejano. De acuerdo con esto, se dará una supervisión estrecha cuando el líder pase mucho tiempo con sus colaboradores y tenga gran influencia sobre cómo ejecuten su trabajo. El caso contrario daría cuenta de una supervisión lejana. Los resultados encontrados evidencian que el impacto del liderazgo sobre variables como la motivación, satisfacción y clima laboral está fuertemente mediada por Grado de Supervisión. Finalmente, se discute la relevancia de este efecto moderador en el ejercicio del liderazgo de los ingenieros que ejercen tanto una supervisión directa como indirecta.The objective of this research is to show the impact of the degree of supervision, as moderator variable of the relationship between leadership, motivation, satisfaction and organizational climate. In this study, Degree of Supervision has been conceptualized as a construct with two poles, close or distant. Accordingly, will be closely monitored when the leader passes much time with their employees and have great influence on his work as implemented, the reverse would account for remote monitoring. The results found evidence that the impact of leadership on variables such as motivation, job satisfaction and climate, is strongly mediated by the degree of supervision. Finally, we discuss the relevance of this moderating effect on the exercise of leadership of the engineers who exercise both direct and indirect supervision.

  5. Feed water control device in a reactor

    International Nuclear Information System (INIS)

    Okutani, Tetsuro.

    1984-01-01

    Purpose: To prevent substantial fluctuations of the water level in a nuclear reactor and always keep a constant standard level under any operation condition. Constitution: When the causes for fluctuating the reactor water level is resulted, a certain amount of correction signal is added to a level deviation signal for the difference between the reactor standard level and the actual reactor water level to control the flow rate of the feed water pump depending on the addition signal. If reactor scram should occur, for instance, a level correction signal changing stepwise depending on a scram signal is outputted and added to the level deviation signal. As the result, the flow rate of feed water sent into the reactor just after the scram is increased, whereby the lowering in the reactor water level upon scram can be decreased as compared with the case where no such level compensation signal is inputted. (Kamimura, M.)

  6. Reactors

    DEFF Research Database (Denmark)

    Shah, Vivek; Vaz Salles, Marcos António

    2018-01-01

    The requirements for OLTP database systems are becoming ever more demanding. Domains such as finance and computer games increasingly mandate that developers be able to encode complex application logic and control transaction latencies in in-memory databases. At the same time, infrastructure...... engineers in these domains need to experiment with and deploy OLTP database architectures that ensure application scalability and maximize resource utilization in modern machines. In this paper, we propose a relational actor programming model for in-memory databases as a novel, holistic approach towards......-level function calls. In contrast to classic transactional models, however, reactors allow developers to take advantage of intra-transaction parallelism and state encapsulation in their applications to reduce latency and improve locality. Moreover, reactors enable a new degree of flexibility in database...

  7. Estrategia Metacognitiva y la Competencia de aprender a aprender en estudiantes del primer grado de secundaria de la I.E. “Mercedes Cabello de Carbonera” – Lima, 2014

    OpenAIRE

    Reategui De Souza, Rosa Guillermina

    2014-01-01

    El presente trabajo de investigación, tuvo por objetivo Determinar la relación entre la Estrategia metacognitiva y la Competencia de Aprender a aprender en Estudiantes del primer grado de secundaria de la I.E. “Mercedes Cabello de Carbonera”. Lima - 201 4. La investigación es cuantitativa no experimental, se realizó un estudio transeccional descriptivo correlacional. La muestra es probabilística aleatoria simple, con una población de 245 estudiantes, quedando finalmente una ...

  8. RA Reactor applications, Annex A

    International Nuclear Information System (INIS)

    Martinc, R.; Cupac, S.; Stanic, A.

    1990-01-01

    RA reactor was not operated during the past five years due to the renewal and reconstruction of the reactor systems, which in underway. In the period from 1986-1990, reactor was operated only 144 MWh in 1986, for the need of testing the reactor systems and possibility of irradiating 125 I. Reactor will not be operated in 1991 because of the exchange of complete instrumentation which is planned to be finished by the end of 1991. It is expected to start operation in May 1992. That is why this annex includes the plan of reactor operation for period of nine months starting from from the moment of start-up. It is planned to operate the reactor at 0.02 MW power first three months, to increase the power gradually and reach 3.5 MW after 8 months of operation. It is foreseen to operate the reactor at 4.7 MW from the tenth month on [sr

  9. A nuclear reactor

    International Nuclear Information System (INIS)

    Kausz, I.; Stuenkel, H.; Wille, H.

    1974-01-01

    The primary cooling circuit of the PWR is a cooling water-cleaning system in parallel connection, through which 10-20% of the cycling cooling water flows. In the cleaning system there is a degasing device in which the cooling water is separated from hydrogen, nitrogen, and oxygen as well as krypton and xenon. The gases then go into a recombiner in which the oxygen is burnt and the resulting water is dropped into a drying device. The gas separating equipment which is connected to the recombiner works by condensation and intermittent evaporation of the single gas parts in heat exchangers corresponding to the liquidization temperatures of the gas parts. The noble gases are led off into a gas storer. The remaining hydrogen is then added again to the coolant circuit in order to ensure the desired excess in the latter. (DG) [de

  10. Reactor physics and thermodynamics of a gaseous core fission reactor

    International Nuclear Information System (INIS)

    Kuijper, J.C.; Van Dam, H.; Stekelenburg, A.J.C.; Hoogenboom, J.E.; Boersma-Klein, W.; Kistemaker, J.

    1990-01-01

    Neutron kinetics and thermodynamics of a Gaseous Core Fission Reactor with magnetical pumping are shown to have many unconventional aspects. Attention is focussed on the properties of the fuel gas, the stationary temperature distribution, the non-linear neutron kinetics and the energy balance in thermodynamical cycles

  11. A new MTR fuel for a new MTR reactor: UMo for the Jules Horowitz reactor

    International Nuclear Information System (INIS)

    Guigon, B.; Vacelet, H.; Dornbusch, D.

    2000-01-01

    Within some years, the Jules Horowitz Reactor will be the only working experimental reactor (material and fuel testing reactor) in France. It will have to provide facilities for a wide range of needs from activation analysis to power reactor fuel qualification. In this paper the main characteristics of the Jules Horowitz Reactor are presented. Safety criteria are explained. Finally, merits and disadvantages of UMo compared to the standard U 3 Si 2 fuel are discussed. (author)

  12. 78 FR 73557 - Guadalupe-Nipomo Dunes National Wildlife Refuge, San Luis Obispo County, CA: Intent To Prepare a...

    Science.gov (United States)

    2013-12-06

    ...-FF08R00000] Guadalupe-Nipomo Dunes National Wildlife Refuge, San Luis Obispo County, CA: Intent To Prepare a...) for the Guadalupe-Nipomo Dunes National Wildlife Refuge located in San Luis Obispo County of... (Refuge) in San Luis Obispo County, California. This notice complies with our CCP policy to (1) advise...

  13. PISA-undersøgelsen - kan den bruges til noget?

    DEFF Research Database (Denmark)

    Lindenskov, Lena; Jankvist, Uffe Thomas; Fink, Klaus

    2014-01-01

    Der gives beskrivelser af det indhold i PISA-rapporterne, som kan betyde noget for, hvordan matematiklærere og didaktikere kan handle. Med fokus på PISA 2012 gengives 4 matematik-spørgsmål, hovedresultater fra elevbesvarelser af opgaver og spørgeskemaer samt forklaringer og nye didaktiske spørgsm....... Der sammenlignes også kort med TIMSS 2011....

  14. Evolução do desempenho cognitivo dos jovens brasileiros no Pisa Evolution of the cognitive achievement of Brazilian youth on Pisa

    Directory of Open Access Journals (Sweden)

    Sergei Suarez Dillon Soares

    2012-04-01

    Full Text Available O artigo analisa a evolução das habilidades cognitivas dos jovens brasileiros medidas pelo Programa Internacional de Avaliação de Alunos - Pisa. Reporta-se a resultados bem positivos. Apesar de um aumento considerável na porcentagem dos jovens aptos a fazer o Pisa e, portanto, uma forte redução na seletividade, a nota média brasileira subiu 33 pontos ao longo dos últimos nove anos. A posição relativa do país também aumentou: nossa nota média foi de 75% para 80% da nota média do grupo original de países que fizeram o Pisa em 2000. Em termos distributivos, a melhora foi mais proeminente na parte inferior da distribuição de habilidades cognitivas. Os centésimos na cauda inferior da distribuição de matemática viram suas notas aumentarem em torno de 70 pontos contra em torno de 30 pontos para os centésimos na cauda superior.This article analyzes the evolution of young Brazilians' cognitive abilities, as measured by the Program for International Student Assessment - Pisa. The results were very positive. Although it was observed a considerable increase in the percentage of youngsters able to complete the Pisa exam and, therefore, a strong decrease in selectivity, the Brazilian average rose 33 points over the past nine years. The relative position of the Brazil also increased, since the average score rose from 75% to 80% of the one found in the original group of countries that participated in this survey, in 2000. In distributive terms, the improvement was even more prominent in the bottom of the cognitive abilities' distribution: the hundredths in the lower tail distribution in Mathematics had their scores increased by about 70 points, against approximately 30 points found in the hundredths of the upper tail.

  15. Fuel assembly in a reactor

    International Nuclear Information System (INIS)

    Saito, Shozo; Kawahara, Akira.

    1975-01-01

    Object: To provide a fuel assembly in a reactor which can effectively prevent damage of the clad tube caused by mutual interference between pellets and the clad tube. Structure: A clad tube for a fuel element, which is located in the outer peripheral portion, among the fuel elements constituting fuel assemblies arranged in assembled and lattice fashion within a channel box, is increased in thickness by reducing the inside diameter thereof to be smaller than that of fuel elements internally located, thereby preventing damage of the clad tube resulting from rapid rise in output produced when control rods are removed. (Kamimura, M.)

  16. Seasonal nutrient dynamics and biomass quality of giant reed (Arundo donax L. and miscanthus (Miscanthus x giganteus Greef et Deuter as energy crops

    Directory of Open Access Journals (Sweden)

    Nicoletta Nassi o Di Nasso

    2011-08-01

    Full Text Available The importance of energy crops in displacing fossil fuels within the energy sector in Europe is growing. Among energy crops, the use of perennial rhizomatous grasses (PRGs seems promising owing to their high productivity and their nutrient recycling that occurs during senescence. In particular, nutrient requirements and biomass quality have a fundamental relevance to biomass systems efficiency. The objective of our study was to compare giant reed (Arundo donax L. and miscanthus (Miscanthus × giganteus Greef et Deuter in terms of nutrient requirements and cellulose, hemicelluloses and lignin content. This aim was to identify, in the Mediterranean environment, the optimal harvest time that may combine, beside a high biomass yield, high nutrient use efficiency and a good biomass quality for second generation biofuel production. The research was carried out in 2009, in San Piero a Grado, Pisa (Central Italy; latitude 43°41’ N, longitude 10°21’ E, on seven-year-old crops in a loam soil characterised by good water availability. Maximum above-ground nutrient contents were generally found in summer. Subsequently, a decrease was recorded; this suggested a nutrient remobilisation from above-ground biomass to rhizomes. In addition, miscanthus showed the highest N, P, and K use efficiency, probably related to its higher yield and its C4 pathway. Regarding biomass quality, stable values of cellulose (38%, hemicelluloses (25% and lignin (8% were reported from July onwards in both crops. Hence, these components appear not to be discriminative parameters in the choice of the harvest time in the Mediterranean environment. In conclusion, our results highlighted that, in our environment, a broad harvest period (from late autumn to winter seems suitable for these PRGs. However, further research is required to evaluate the role of rhizomes in nutrient storage and supply during the growing season, as well as ecological and productive performances in marginal

  17. 75 FR 38412 - Safety Zone; San Diego POPS Fireworks, San Diego, CA

    Science.gov (United States)

    2010-07-02

    ...-AA00 Safety Zone; San Diego POPS Fireworks, San Diego, CA AGENCY: Coast Guard, DHS. ACTION: Temporary... waters of San Diego Bay in support of the San Diego POPS Fireworks. This safety zone is necessary to... San Diego POPS Fireworks, which will include fireworks presentations conducted from a barge in San...

  18. Reactor physics using a microcomputer

    International Nuclear Information System (INIS)

    Murray, R.L.

    1983-01-01

    The object of the work reported is to develop educational computer modules for all aspects of reactor physics. The modules consist of a description of the theory, mathematical method, computer program listing, sample calculations, and problems for the student, along with a card deck. Modules were first written in FORTRAN for an IBM 360/75, then later in BASIC for microcomputers. Problems include: limitation of equipment, choice of format for the program, the variety of dialects of BASIC used in the different microcomputer and peripherals brands, and knowing when to quit in the process of developing a program

  19. Keefektivan PMRI Berbantuan Alat Peraga Terhadap Kemampuan Pemecahan Masalah Serupa PISA Pada Kelas VII

    Directory of Open Access Journals (Sweden)

    Riyanto Riyanto

    2014-06-01

    student learning achievement are then analyzed to the thoroughness test and the average difference test: one side test (right side. The results of this research are (1 The students achievement of experimental class not yet achieved the minimum completeness criteria, (2 the average the problem solving skills PISA of experimental class learning better than controlling class, and (3 score average of teacher activity of experimental class and controlling class have a good category.  Keywords:          PISA; PMRI; Quality of teaching.

  20. A method of installing a reactor container

    International Nuclear Information System (INIS)

    Hayashi, Kenji; Murakawa, Hisao.

    1975-01-01

    Object: To achieve exact installation of a reactor container at a site. Structure: A pole is set upright at the center of a cylindrical base portion, a plurality of beams are disposed around the pole in a radial fashion to form a cone, a plurality of steel plates are mounted successively around the cone through a ring, and the steel plates are welded to each other to assemble and install a reactor container at the same time. (Kamimura, M.)

  1. The students’ ability in mathematical literacy for the quantity, and the change and relationship problems on the PISA adaptation test

    Science.gov (United States)

    Julie, Hongki; Sanjaya, Febi; Yudhi Anggoro, Ant.

    2017-09-01

    One of purposes of this study was to describe the solution profile of the junior high school students for the PISA adaptation test. The procedures conducted by researchers to achieve this objective were (1) adapting the PISA test, (2) validating the adapting PISA test, (3) asking junior high school students to do the adapting PISA test, and (4) making the students’ solution profile. The PISA problems for mathematics could be classified into four areas, namely quantity, space and shape, change and relationship, and uncertainty. The research results that would be presented in this paper were the result test for quantity, and change and relationship problems. In the adapting PISA test, there were fifteen questions that consist of two questions for the quantity group, six questions for space and shape group, three questions for the change and relationship group, and four questions for uncertainty. Subjects in this study were 18 students from 11 junior high schools in Yogyakarta, Central Java, and Banten. The type of research that used by the researchers was a qualitative research. For the first quantity problem, there were 38.89 % students who achieved level 3. For the second quantity problem, there were 88.89 % students who achieved level 2. For part a of the first change and relationship problem, there were 55.56 % students who achieved level 5. For part b of the first change and relationship problem, there were 77.78 % students who achieved level 2. For the second change and relationship problem, there were 38.89 % students who achieved level 2.

  2. Estudio transversal de las actitudes hacia la ciencia en estudiantes de grados quinto a undécimo. Adaptación y aplicación de un instrumento para valorar actitudes

    Directory of Open Access Journals (Sweden)

    Manuel Molina

    2013-12-01

    Full Text Available El presente trabajo muestra el estudio de las actitudes hacia la ciencia en un grupo de estudiantes a lo largo de los diferentes niveles de secundaria, según la implementación, ajuste y aplicación de un instrumento evaluativo propuesto originalmente por Barmby, Kind y Jones (2008. La aplicación del instrumento y de una entrevista semiestructurada permitieron obtener resultados confiables (alfa de Cronbach, ? = 0,77sobre diferentes categorías de actitud frente a la ciencia. Los resultados indican que, en la población estudiada, no hay diferencias significativas respecto al género. Se observaron concepciones favorables respecto a la importancia de la ciencia y la tecnología y al trabajo práctico en ciencias, pero desfavorables frente a las posibilidades futuras de trabajar en el ámbito científico y con manifestaciones recurrentes sobre imaginarios de complejidad hacia la actividad científica. Finalmente, es evidente una disminución progresiva (desde grado quinto hasta grado undécimo de las actitudes favorables frente a las ciencias.

  3. Pressurized water reactor with a reactor pressure vessel

    International Nuclear Information System (INIS)

    Werres, L.

    1979-01-01

    The core barrel is suspended from a flange by means of a grid. The coolant enters the barrel from below through the grid. In order to get a uniform flow over the reactor core there is provided for a guiding device below the grid. It consists of a cylindrical shell with borings uniformly distributed around the shell as well as fins on the inner surface of the shell and slots at the bottom facing the pressure vessel. (GL) [de

  4. A look inside the San Andreas Fault at Parkfield through vertical seismic profiling.

    Science.gov (United States)

    Chavarria, J Andres; Malin, Peter; Catchings, Rufus D; Shalev, Eylon

    2003-12-05

    The San Andreas Fault Observatory at Depth pilot hole is located on the southwestern side of the Parkfield San Andreas fault. This observatory includes a vertical seismic profiling (VSP) array. VSP seismograms from nearby microearthquakes contain signals between the P and S waves. These signals may be P and S waves scattered by the local geologic structure. The collected scattering points form planar surfaces that we interpret as the San Andreas fault and four other secondary faults. The scattering process includes conversions between P and S waves, the strengths of which suggest large contrasts in material properties, possibly indicating the presence of cracks or fluids.

  5. Microestructura de una unión disímil AISI 321 y una aleación A 351 grado HK-40 obtenida mediante soldadura manual por arco eléctrico

    Directory of Open Access Journals (Sweden)

    Reilis Fuentes-Guilarte

    2016-05-01

    Full Text Available El objetivo fue establecer el comportamiento microestructural de una unión disímil de acero inoxidable austenítico AISI 321 y de la aleación A 351 grado HK 40 obtenida por fundición mediante soldadura manual por arco eléctrico y electrodos revestidos del tipo E 309 L-16. La estructura ferrita–austeníta que se forma en la unión del acero con la aleación es resultado del elevado contenido de carbono de la segunda. La baja velocidad de enfriamiento del cordón de soldadura revela ausencia de discontinuidades en el retículo cristalino de la zona afectada térmicamente y atenúa la formación de carburos de cromo del tipo Cr23C6, que puede formar la aleación A 351 grado HK 40 durante la difusión del volumen de fracción en masa del cromo.

  6. Safety of research reactors - A regulator's perspective

    International Nuclear Information System (INIS)

    Rahman, M.S.

    2001-01-01

    Due to historical reasons research reactors have received less regulatory attention in the world than nuclear power plants. This has given rise to several safety issues which, if not addressed immediately, may result in an undesirable situation. However, in Pakistan, research reactors and power reactors have received due attention from the regulatory authority. The Pakistan Research Reactor-1 has been under regulatory surveillance since 1965, the year of its commissioning. The second reactor has also undergone all the safety reviews and checks mandated by the licensing procedures. A brief description of the regulatory framework, the several safety reviews carried out have been briefly described in this paper. Significant activities of the regulatory authority have also been described in verifying the safety of research reactors in Pakistan along with the future activities. The views of the Pakistani regulatory authority on the specific issues identified by the IAEA have been presented along with specific recommendations to the IAEA. We are of the opinion that there are more Member States operating nuclear research reactors than nuclear power plants. Therefore, there should be more emphasis on the research reactor safety, which somehow has not been the case. In several recommendations made to the IAEA on the specific safety issues the emphasis has been, in general, to have a similar documentation and approach for maintaining and verifying operational safety at research reactors as is currently available for nuclear power reactors and may be planned for nuclear fuel cycle facilities. (author)

  7. An internally illuminated monolith reactor: Pros and cons relative to a slurry reactor

    NARCIS (Netherlands)

    Carneiro, Joana T.; Carneiro, J.T.; Berger, Rob; Moulijn, Jacob A.; Mul, Guido

    2009-01-01

    In the present study, kinetic models for the photo-oxidation of cyclohexane in two different photoreactor systems are discussed: a top illumination reactor (TIR) representative of a slurry reactor, and the so-called internally illuminated monolith reactor (IIMR) representing a reactor containing

  8. The education system of Finland and its success in the PISA test

    Directory of Open Access Journals (Sweden)

    Emilio Jesús Lizarte Simón

    2012-12-01

    Full Text Available Once again, the Finnish educational system has scored well in the PISA-tests. Among its various organizational structures and policies, the consensus of the educational policy - which is reflected by uniform structures and directions for developing the curriculum - can be identified as a reason for the success. The municipalities are responsible for the organization and realization of the primary education as well as establishing a more detailed curriculum in accordance with the goals of the National Board of Education. The schools and the teachers are allowed a great deal of independence when developing the pedagogical content and choosing a method. This orientation reflects an adjustment in the goals of the curriculum which now emphasizes practical usefulness of the information acquired by the students rather than strict adherence to a rigid curriculum. Also the change in the inspection system and the development of the education after the primary education are important aspects considering the Finnish success in the PISA tests.

  9. Decommissioning of a small reactor (BR3 reactor, Belgium)

    International Nuclear Information System (INIS)

    Dadoumont, J.; Massaut, V.; Klein, M.; Demeulemeester, Y.

    2002-01-01

    Since 1989, SCK-CEN has been dismantling its PWR reactor BR3 (Belgian Reactor No. 3). After gaining a great deal of experience in remote dismantling of highly radioactive components during the actual dismantling of the two sets of internals, the BR3 team completed the cutting of its reactor pressure vessel (RPV). During the feasibility phase of the RPV dismantling, a decision was made to cut it under water in the refuelling pool of the plant, after having removed it from its cavity. The RPV was cut into segments using a milling cutter and a bandsaw machine. These mechanical techniques have shown their ability for this kind of operations. Prior to the segmentation, the thermal insulation situated around the RPV was remotely removed and disposed of. The paper will describe all these operations. The BR3 decommissioning activities also include the dismantling of contaminated loops and equipment. After a careful sorting of the pieces, optimized management routes are selected in order to minimize the final amount of radioactive waste to be disposed of. Some development of different methods of decontamination were carried out: abrasive blasting (or sand blasting), chemical decontamination (Oxidizing-Reducing process using Cerium). The main goal of the decontamination program is to recycle most of the metallic materials either in the nuclear world or in the industrial world by reaching the respective recycling or clearance level. Overall the decommissioning of the BR3 reactor has shown the feasibility of performing such a project in a safe and economical way. Moreover, BR3 has developed methodologies and decontamination processes to economically reduce the amount of radwaste produced. (author)

  10. Neutronics of a mixed-flow gas-core reactor

    International Nuclear Information System (INIS)

    Soran, P.D.; Hansen, G.E.

    1977-11-01

    The study was made to investigate the neutronic feasibility of a mixed-flow gas-core reactor. Three reactor concepts were studied: four- and seven-cell radial reactors and a seven-cell scallop reactor. The reactors were fueled with UF 6 (either U-233 or U-235) and various parameters were varied. A four-cell reactor is not practical nor is the U-235 fueled seven-cell radial reactor; however, the 7-cell U-233 radial and scallop reactors can satisfy all design criteria. The mixed flow gas core reactor is a very attractive reactor concept and warrants further investigation

  11. Plant with nuclear reactor, in particular a thermal reactor

    International Nuclear Information System (INIS)

    Straub, H.

    1988-01-01

    The reactor core of the plant has tubular and vertically movable control rods moved by a flow of coolant under pressure. Each control rod surrounds a similarly tubular guide rod, stationary relative to the reactor core, leaving an annular slot-like space therebetween. The inside of each guide rod forms a first pressure chamber supplied with the coolant under pressure. The upper end of each control rod is closed and has a vertical shaft that extends into the inside of the guide rod and forms therewith a second annular slot-like space. At least one first restriction is provided in the first annular slot-like space and at least one second restriction is provided in the second annular slot-like space. A second pressure chamber is formed between both restrictions. The coolant supplied to the guide rod thus returns to the pressure vessel surrounding the reactor core through the second annular slot-like space, the second pressure chamber and the first annular slot-like space. Controlling means are provided, with which pressure thrusts can be generated if necessary in the coolant within the first pressure chamber. (author) 5 refs., 10 figs

  12. Characterization of the interaction layer in diffusion couples U-Mo-Zr/Al and U-Mo-Zr/Al-A356 at 550 C degrees; Caracterizacion de la zona de interaccion en pares de difusion a 550 grados C U-Mo-Zr/Al y U-Mo-Zr/Al-A356

    Energy Technology Data Exchange (ETDEWEB)

    Komar Varela, Carolina; Arico, Sergio; Mirandou, Marcela; Balart, Silvia; Gribaudo, Luis [Comision Nacional de Energia Atomica, General San Martin (Argentina). Dept. de Materiales; com, carolinakomar@gmail

    2007-07-01

    Out-of-pile diffusion experiments were performed between U-7 wt.% Mo-1 wt.% Zr and Al or Al A356 (7,1 wt.% Si) at 550 C degrees. In this work morphological characterization and phase identification on both interaction layers are presented. They were carried out by the use of different techniques: optical and scanning electron microscopy, X-ray diffraction and WDS microanalysis. In the interaction layer U-7 wt.% Mo-1 wt.% Zr/Al, the phases UAl{sub 3}, UAl{sub 4}, Al{sub 20}Mo{sub 2}U and Al{sub 43}Mo{sub 4}U{sub 6} were identified. Similar results in the interaction layer of the U-7 % Mo/Al at 580 C degrees were previously obtained. In the interaction layer U-7 wt.% Mo-1 wt.% Zr/Al A356, the phases U(Al,Si){sub 3} with 25 at.% Si and Si{sub 5}U{sub 3} were identified. This last phase, with a higher Si concentration, was identified with X-ray diffraction synchrotron radiation performed at the National Synchrotron Light Laboratory, Campinas, Brazil. (author) [Spanish] Se realizaron experiencias fuera de reactor en pares de difusion quimica U-7 % Mo-1 % Zr/Al y U-7 % Mo-1 % Zr/Al A356. En este trabajo se presentan los resultados de la caracterizacion morfologica e identificacion de fases presentes en la zona de interaccion que se forma al ser sometidos a un tratamiento isotermico de 1,5 h a 550 grados C. Las tecnicas utilizadas fueron: microscopia optica y electronica de barrido, difraccion de rayos X y microanalisis cuantitativo por sonda electronica. En la zona de interaccion correspondiente al par U-7 % Mo-1 % Zr/Al se identificaron las fases UAl{sub 3}, UAl{sub 4}, Al{sub 20}Mo{sub 2}U y Al{sub 43}Mo{sub 4}U{sub 6}. Estas cuatro fases fueron identificadas en pares U-7 % Mo/Al a 580 grados C en trabajos anteriores. En la zona de interaccion correspondiente al par U-7 % Mo-1 % Zr/Al A356 se identificaron las fases U(Al,Si){sub 3} (con una concentracion de 25 %at.Si) y Si{sub 5}U{sub 3}. Este compuesto rico en Si solo pudo ser identificado mediante la utilizacion de

  13. Programming for a nuclear reactor instrument simulator

    International Nuclear Information System (INIS)

    Cohn, C.E.

    1989-01-01

    A new computerized control system for a transient test reactor incorporates a simulator for pre-operational testing of control programs. The part of the simulator pertinent to the discussion here consists of two microprocessors. An 8086/8087 reactor simulator calculates simulated reactor power by solving the reactor kinetics equations. An 8086 instrument simulator takes the most recent power value developed by the reactor simulator and simulates the appropriate reading on each of the eleven reactor instruments. Since the system is required to run on a one millisecond cycle, careful programming was required to take care of all eleven instruments in that short time. This note describes the special programming techniques used to attain the needed performance

  14. Calculation models for a nuclear reactor

    International Nuclear Information System (INIS)

    Tashanii, Ahmed Ali

    2010-01-01

    Determination of different parameters of nuclear reactors requires neutron transport calculations. Due to complicity of geometry and material composition of the reactor core, neutron calculations were performed for simplified models of the real arrangement. In frame of the present work two models were used for calculations. First, an elementary cell model was used to prepare cross section data set for a homogenized-core reactor model. The homogenized-core reactor model was then used to perform neutron transport calculation. The nuclear reactor is a tank-shaped thermal reactor. The semi-cylindrical core arrangement consists of aluminum made fuel bundles immersed in water which acts as a moderator as well as a coolant. Each fuel bundle consists of aluminum cladded fuel rods arranged in square lattices. (author)

  15. Experience in using a research reactor for the training of power reactor operators

    International Nuclear Information System (INIS)

    Blotcky, A.J.; Arsenaut, L.J.

    1972-01-01

    A research reactor facility such as the one at the Omaha Veterans Administration Hospital would have much to offer in the way of training reactor operators. Although most of the candidates for the course had either received previous training in the Westinghouse Reactor Operator Training Program, had operated nuclear submarine reactors or had operated power reactors, they were not offered the opportunity to perform the extensive manipulations of a reactor that a small research facility will allow. In addition the AEC recommends 10 research reactor startups per student as a prerequisite for a cold operator?s license and these can easily be obtained during the training period

  16. Fluidized bed nuclear reactor as a IV generation reactor

    International Nuclear Information System (INIS)

    Sefidvash, Farhang

    2002-01-01

    The object of this paper is to analyze the characteristics of the Fluidized Bed Nuclear Reactor (FBNR) concept under the light of the requirements set for the IV generation nuclear reactors. It is seen that FBNR generally meets the goals of providing sustainable energy generation that meets clean air objectives and promotes long-term availability of systems and effective fuel utilization for worldwide energy production; minimize and manage their nuclear waste and notably reduce the long term stewardship burden in the future, thereby improving protection for the public health and the environment; increase the assurance that it is a very unattractive and least desirable route for diversion or theft of weapons-usable materials; excel in safety and reliability; have a very low likelihood and degree of reactor core damage; eliminate the need for offsite emergency response; have a clear life-cycle cost advantage over other energy sources; have a level of financial risk comparable to other energy projects. The other advantages of the proposed design are being modular, low environmental impact, exclusion of severe accidents, short construction period, flexible adaptation to demand, excellent load following characteristics, and competitive economics. (author)

  17. Simulation of a pool type research reactor

    International Nuclear Information System (INIS)

    Oliveira, Andre Felipe da Silva de; Moreira, Maria de Lourdes

    2011-01-01

    Computational fluid dynamic is used to simulate natural circulation condition after a research reactor shutdown. A benchmark problem was used to test the viability of usage such code to simulate the reactor model. A model which contains the core, the pool, the reflector tank, the circulation pipes and chimney was simulated. The reactor core contained in the full scale model was represented by a porous media. The parameters of porous media were obtained from a separate CFD analysis of the full core model. Results demonstrate that such studies can be carried out for research and test of reactors design. (author)

  18. The San Diego Center for Patient Safety: Creating a Research, Education, and Community Consortium

    National Research Council Canada - National Science Library

    Pratt, Nancy; Vo, Kelly; Ganiats, Theodore G; Weinger, Matthew B

    2005-01-01

    In response to the Agency for Healthcare Research and Quality's Developmental Centers of Education and Research in Patient Safety grant program, a group of clinicians and academicians proposed the San...

  19. A new fluidized bed nuclear reactor

    International Nuclear Information System (INIS)

    Sefidvash, F.

    1986-01-01

    A new nuclear reactor design based on the fluidized bed concept is proposed. A current design utilizes spherical fuel of slightly enriched Zircaloy-clad uranium dioxide fluidized by light water under pressure. The reactor is modular in system; therefore, any size reactor can be constructed from the basic standard modul. The reactor physics calculations show that reactivity increases with porosity to a maximum value and thereafter decreases. This produces inherent safety and eliminates the need for control rods and burnable poisons. The heat transfer calculations show that the maximum power extracted from the reactor core is not limited to the material temperature limits but to the maximum mass flow of coolant, which corresponds to the desired operating porosity. Design simplicity and inherent safety make it an attractive small reactor design. (Author) [pt

  20. A glossary of terms for fast reactors

    International Nuclear Information System (INIS)

    Wheeler, R.C.

    1979-04-01

    The glossary aims to provide definitions of technical terms likely to be used in a fast reactor enquiry and to encourage the use of the same set of consistent terms in any documents intended for such an inquiry. In some cases definitions are formulated in the limited context of LMFBRS rather than applying to all types of reactors. A brief guide is presented to the different reactor types. (author)

  1. Reinforced confinement in a nuclear reactor

    International Nuclear Information System (INIS)

    Norman, H.

    1988-01-01

    The present invention concerns a nuclear reactor containing a reactor core, a swimming pool space that is filled and pressurized with a neutron-absorbing solution, a reactor tank, at least one heat exchanger, at least one inlet line, at least one return line and at least one circulation pump, where the said reactor tank is confined in the said swimming pool space and designed to be cooled with the aid of relatively pure water, which is fed by means of the said at least one circulating pump to the said reactor tank from the said heat exchanger via the said at least one inlet line and is returned to the heat exchanger via the said at least one return line. The problem that is to be solved by the invention is to design a reactor of the above type in such a way that a complete confinement of the primary circuit of the reactor is achieved at relatively low extra cost. This problem is solved by providing the reactor with a special confinement space that confines the heat exchanger, but not the reactor tank, with the confinement space and the swimming pool space being fashioned in the same concrete body

  2. Sulfide toxicity kinetics of a uasb reactor

    Directory of Open Access Journals (Sweden)

    D. R. Paula Jr.

    2009-12-01

    Full Text Available The effect of sulfide toxicity on kinetic parameters of anaerobic organic matter removal in a UASB (up-flow anaerobic sludge blanket reactor is presented. Two lab-scale UASB reactors (10.5 L were operated continuously during 12 months. The reactors were fed with synthetic wastes prepared daily using glucose, ammonium acetate, methanol and nutrient solution. One of the reactors also received increasing concentrations of sodium sulfide. For both reactors, the flow rate of 16 L.d-1 was held constant throughout the experiment, corresponding to a hydraulic retention time of 15.6 hours. The classic model for non-competitive sulfide inhibition was applied to the experimental data for determining the overall kinetic parameter of specific substrate utilization (q and the sulfide inhibition coefficient (Ki. The application of the kinetic parameters determined allows prediction of methanogenesis inhibition and thus the adoption of operating parameters to minimize sulfide toxicity in UASB reactors.

  3. The education system of Finland and its success in the PISA test

    OpenAIRE

    Emilio Jesús Lizarte Simón; Martin Gripenberg

    2012-01-01

    Once again, the Finnish educational system has scored well in the PISA-tests. Among its various organizational structures and policies, the consensus of the educational policy - which is reflected by uniform structures and directions for developing the curriculum - can be identified as a reason for the success. The municipalities are responsible for the organization and realization of the primary education as well as establishing a more detailed curriculum in accordance with the goals of the ...

  4. Los doce trabajos de Hércules de Villena y la Fiorita de Guido da Pisa

    Directory of Open Access Journals (Sweden)

    Paolo Cherchi

    2002-12-01

    Full Text Available This essay points out a general source for Enrique de Villena's Los doce trabajos de Hércules. The source is Guido da Pisa's Fiorita d'Italia, specifically a section of it which is entirely devoted to Hercules' labors. Villena draws historical and exegetical data from this source, and at times he does so verbatim, but most often he amplifies and manipulates these data with originality in order to pursue his moral and political goals.

  5. A new advanced safe nuclear reactor concept

    International Nuclear Information System (INIS)

    Sefidvash, Farhang

    1999-01-01

    The reactor design is based on fluidized bed concept and utilizes pressurized water reactor technology. The fuel is automatically removed from the reactor by gravity under any accident condition. The reactor demonstrates the characteristics of inherent safety and passive cooling. Here two options for modification to the original design are proposed in order to increase the stability and thermal efficiency of the reactor. A modified version of the reactor involves the choice of supercritical steam as the coolant to produce a plant thermal efficiency of about 40%. Another is to modify the shape of the reactor core to produce a non-fluctuating bed and consequently guarantee the dynamic stability of the reactor. The mixing of Tantalum in the fuel is also proposed as an additional inhibition to power excursion. The spent fuel pellets may not be considered nuclear waste since they are in the shape and size that can easily be used as a a radioactive source for food irradiation and industrial applications. The reactor can easily operate with any desired spectrum by varying the porosity in order to be a plutonium burner or utilize a thorium fuel cycle. (author)

  6. RSAS: a Reactor Safety Assessment System

    International Nuclear Information System (INIS)

    Sebo, D.E.; Dixon, B.W.; Bray, M.A.

    1985-01-01

    The Reactor Safety Assessment System (RSAS) is an expert system under development for the United States Nuclear Regulatory Commission (NRC). RSAS is being developed for use at the NRC's Operations Center in the event of a serious incident at a licensed nuclear power plant. The system generates situation assessments for the NRC Reactor Safety Team based on a limited number of plant parameters, known operator actions, and plant status data. The RSAS rule base currently covers one reactor type. The extension of the rule base to other reactor types is also discussed

  7. Concomitant Appearance of Pisa Syndrome and Striatal Hand in Parkinson’s Disease

    Directory of Open Access Journals (Sweden)

    Sanjay Pandey

    2011-10-01

    Full Text Available Pisa syndrome is (PS usually seen in patients receiving antipsychotic drugs and characterised by lateral flexion of trunk and axial dystonia. It is believed that antipsychotic drugs lead to dopamine blockage causing PS. We describe a Parkinson’s disease patient who was doing well with levodopa/carbidopa for 3 years and developed lateral flexion of trunk. His abnormal posture used to completely improve upon lying down position. He also had striatal hand deformity suggestive of focal dystonia.

  8. Geothermal training at the International Institute of Geothermal Research in Pisa, Italy

    International Nuclear Information System (INIS)

    Dickson, M.H.; Fanelli, M.

    1990-01-01

    Between 1985 and 1990 the International School of Geothermics of Pisa has held 5 long-term courses, attended by 93 trainees. This paper reports that since 1970, when it began its activity, the Italian geothermal training center has prepared a total of 293 goethermists from 64 countries. Under its present structure the International School of Geothermics organizes short courses and seminars, along with the long-term courses directed mainly at geothermal exploration

  9. Fusion reactors as a future energy source

    International Nuclear Information System (INIS)

    Seifritz, W.

    A detailed update of fusion research concepts is given. Discussions are given for the following areas: (1) the magnetic confinement principle, (2) UWMAK I: conceptual design for a fusion reactor, (3) the inertial confinement principle, (4) the laser fusion power plant, (5) electron-induced fusion, (6) the long-term development potential of fusion reactors, (7) the symbiosis between fusion and fission reactors, (8) fuel supply for fusion reactors, (9) safety and environmental impact, and (10) accidents, and (11) waste removal and storage

  10. SOLASE: a conceptual laser fusion reactor design

    International Nuclear Information System (INIS)

    Conn, R.W.; Abdel-Khalik, S.I.; Moses, G.A.

    1977-12-01

    The SOLASE conceptual laser fusion reactor has been designed to elucidate the technological problems posed by inertial confinement fusion reactors. This report contains a detailed description of all aspects of the study including the physics of pellet implosion and burn, optics and target illumination, last mirror design, laser system analysis, cavity design, pellet fabrication and delivery, vacuum system requirements, blanket design, thermal hydraulics, tritium analysis, neutronics calculations, radiation effects, stress analysis, shield design, reactor and plant building layout, maintenance procedures, and power cycle design. The reactor is designed as a 1000 MW/sub e/ unit for central station electric power generation

  11. Rotor for a pyrolysis centrifuge reactor

    DEFF Research Database (Denmark)

    2015-01-01

    The present invention relates to a rotor for a pyrolysis centrifuge reactor, said rotor comprising a rotor body having a longitudinal centre axis, and at least one pivotally mounted blade being adapted to pivot around a pivot axis under rotation of the rotor body around the longitudinal centre axis....... Moreover, the present invention relates to a pyrolysis centrifuge reactor applying such a rotor....

  12. Research reactor job analysis - A project description

    International Nuclear Information System (INIS)

    Yoder, John; Bessler, Nancy J.

    1988-01-01

    Addressing the need of the improved training in nuclear industry, nuclear utilities established training program guidelines based on Performance-Based Training (PBT) concepts. The comparison of commercial nuclear power facilities with research and test reactors owned by the U.S. Department of Energy (DOE), made in an independent review of personnel selection, training, and qualification requirements for DOE-owned reactors pointed out that the complexity of the most critical tasks in research reactors is less than that in power reactors. The U.S. Department of Energy (DOE) started a project by commissioning Oak Ridge Associated Universities (ORAU) to conduct a job analysis survey of representative research reactor facilities. The output of the project consists of two publications: Volume 1 - Research Reactor Job Analysis: Overview, which contains an Introduction, Project Description, Project Methodology,, and. An Overview of Performance-Based Training (PBT); and Volume 2 - Research Reactor Job Analysis: Implementation, which contains Guidelines for Application of Preliminary Task Lists and Preliminary Task Lists for Reactor Operators and Supervisory Reactor Operators

  13. A Summary of the San Francisco Tidal Wetlands Restoration Series

    Directory of Open Access Journals (Sweden)

    Larry R. Brown

    2003-10-01

    Full Text Available The four topical articles of the Tidal Wetlands Restoration Series summarized and synthesized much of what is known about tidal wetlands and tidal wetland restoration in the San Francisco Estuary (hereafter “Estuary”. Despite a substantial amount of available information, major uncertainties remain. A major uncertainty with regard to fishes is the net benefit of restored tidal wetlands relative to other habitats for native fishes in different regions of the Estuary given the presence of numerous invasive alien species. With regard to organic carbon, a major uncertainty is the net benefit of land use change given uncertainty about the quantity and quality of different forms of organic carbon resulting from different land uses. A major challenge is determining the flux of organic carbon from open systems like tidal wetlands. Converting present land uses to tidal wetlands will almost certainly result in increased methylation of mercury at the local scale with associated accumulation of mercury within local food webs. However, it is unclear if such local accumulation is of concern for fish, wildlife or humans at the local scale or if cumulative effects at the regional scale will emerge. Based on available information it is expected that restored tidal wetlands will remain stable once constructed; however, there is uncertainty associated with the available data regarding the balance of sediment accretion, sea-level rise, and sediment erosion. There is also uncertainty regarding the cumulative effect of many tidal restoration projects on sediment supply. The conclusions of the articles highlight the need to adopt a regional and multidisciplinary approach to tidal wetland restoration in the Estuary. The Science Program of the CALFED effort provides an appropriate venue for addressing these issues.

  14. The decommissioning of a small nuclear reactor

    International Nuclear Information System (INIS)

    Neset, K.; Christensen, G.C.; Lundby, J.E.; Roenneberg, G.A.

    1990-02-01

    The JEEP II reactor at Kjeller, Norway has been used as a model for a study of the decommissioning of a small research reactor. A radiological survey is given and a plan for volume reducing, packaging, certifying, classifying and shipping of the radioactive waste is described. 23 refs., 4 figs

  15. A nuclear power reactor concept for Brazil

    International Nuclear Information System (INIS)

    Sefidvash, F.

    1980-01-01

    For the purpose of developing an independent national nuclear technology and effective manner of transferring such a technology, as well as developing a modern reactor, a new nuclear power reactor concept is proposed which is considered as a suitable and viable project for Brazil to support its development and finally construct its prototype as an indigeneous venture. (Author) [pt

  16. LA INCIDENCIA DEL SEXO, DEL NIVEL DE COMPETENCIA EN INGLÉS Y DEL GRADO DE MOTIVACIÓN EN PERCEPCIONES SOBRE APRENDIZAJE A TRAVÉS DE UNA APLICACIÓN EN LÍNEA

    Directory of Open Access Journals (Sweden)

    M.ª Elvira Barrios Espinosa

    2015-01-01

    Full Text Available Este artículo explora la incidencia de tres variables, a saber, el sexo, el nivel de competencia en inglés y el grado de motivación, en las percepciones que albergan usuarios de la aplicación en línea Tell Me More acerca de su avance en habilidades comunicativas y competencias lingüísticas mediante dicha aplicación, y acerca de la contribución de distintas actividades que lo conforman a su progresión en inglés. La finalidad que se persigue, en última instancia, es la de identificar características individuales que se relacionan con percepciones más o menos favorables sobre esta aplicación como programa de autoaprendizaje de inglés basado en red. El estudio, en el que participaron 75 docentes de la Universidad de Málaga, empleó el cuestionario como estrategia de recogida de datos, a los que se aplicaron, según los casos, las pruebas estadísticas U de Mann-Whitney y Kruskal-Wallis, y se calcularon tablas de contingencia y el coeficiente de correlación de Kendall. Los hallazgos indican que la variable sexo influye en la percepción de progresión en inglés en tres de las cinco habilidades comunicativas por las que se sondeó a los participantes. Además, se comprueba que, a menor nivel de competencia en inglés, mayor es el grado en que los usuarios consideran que han contribuido las actividades a su aprendizaje; asimismo, de los tres estudiados, el grado de motivación es el factor más influyente, tanto en la percepción de avance en habilidades y competencias como en la consideración favorable de la contribución de las distintas actividades al aprendizaje del idioma. Estos hallazgos, junto a la constatación de que, a menor nivel de inglés, mayor es la motivación que genera Tell Me More, lleva a concluir que se trata de una plataforma más recomendable para estudiantes de nivel elemental en inglés que para quienes poseen un nivel igual o superior al nivel B1 según el Marco Común Europeo de Referencia para las Lenguas.

  17. Reactor

    International Nuclear Information System (INIS)

    Fujibayashi, Toru.

    1976-01-01

    Object: To provide a boiling water reactor which can enhance a quake resisting strength and flatten power distribution. Structure: At least more than four fuel bundles, in which a plurality of fuel rods are arranged in lattice fashion which upper and lower portions are supported by tie-plates, are bundled and then covered by a square channel box. The control rod is movably arranged within a space formed by adjoining channel boxes. A spacer of trapezoidal section is disposed in the central portion on the side of the channel box over substantially full length in height direction, and a neutron instrumented tube is disposed in the central portion inside the channel box. Thus, where a horizontal load is exerted due to earthquake or the like, the spacers come into contact with each other to support the channel box and prevent it from abnormal vibrations. (Furukawa, Y.)

  18. Method of operating a nuclear reactor

    International Nuclear Information System (INIS)

    Spurgin, A.J.; Schaefer, W.F.

    1978-01-01

    A method of controlling a nuclear power generting station in the event of a malfunction of particular operating components is described. Upon identification of a malfunction, preselected groups of control rods are fully inserted sequentially until a predetermined power level is approached. Additional control rods are then selectively inserted to quickly bring the reactor to a second given power level to be compatible with safe operation of the system with the malfunctioning component. At the time the thermal power output of the reactor is being reduced, the turbine is operated at a rate consistent with the output of the reactor. In the event of a malfunction, the power generating system is operated in a turbine following reactor mode, with the reactor power rapidly reduced, in a controlled manner, to a safe level compatible with the type of malfunction experienced

  19. Method for refuelling a nuclear reactor core

    International Nuclear Information System (INIS)

    Anon.

    1977-01-01

    This invention relates to an improved method for refuelling a nuclear reactor core inside a reactor vessel. The technique allows a substantial reduction in the refuelling time as compared with previously known methods and permits fewer out of core operations and smaller temporary storage space. (U.K.)

  20. Jumping to Conclusions--The PISA Knee-Jerk: Some Remarks on the Current Economic-Educational Discourse

    Science.gov (United States)

    Bittlingmayer, Uwe H.; Boutiuc, Alina Florentina; Heinemann, Lars; Kotthoff, Hans-Georg

    2016-01-01

    Ever since PISA studies have been constantly present in mainstream media, a close relation between academic achievement and economic outcome has been routinely presumed. This essay takes a closer look at some of the most common lines of argument, then goes on to outline a critique of the assumptions underlying the alleged causal relationship…

  1. Seismic attenuation system for a nuclear reactor

    Energy Technology Data Exchange (ETDEWEB)

    Liszkai, Tamas; Cadell, Seth

    2018-01-30

    A system for attenuating seismic forces includes a reactor pressure vessel containing nuclear fuel and a containment vessel that houses the reactor pressure vessel. Both the reactor pressure vessel and the containment vessel include a bottom head. Additionally, the system includes a base support to contact a support surface on which the containment vessel is positioned in a substantially vertical orientation. An attenuation device is located between the bottom head of the reactor pressure vessel and the bottom head of the containment vessel. Seismic forces that travel from the base support to the reactor pressure vessel via the containment vessel are attenuated by the attenuation device in a direction that is substantially lateral to the vertical orientation of the containment vessel.

  2. The Design of a Nuclear Reactor

    Indian Academy of Sciences (India)

    The aim of this largely pedagogical article is toemploy pre-college physics to arrive at an understanding of a system as complex as a nuclear reactor. We focus on three key issues: the fuelpin, the moderator, and lastly the dimensions ofthe nuclear reactor.

  3. The Design of a Nuclear Reactor

    Indian Academy of Sciences (India)

    2016-08-26

    Aug 26, 2016 ... The aim of this largely pedagogical article is toemploy pre-college physics to arrive at an understanding of a system as complex as a nuclear reactor. We focus on three key issues: the fuelpin, the moderator, and lastly the dimensions ofthe nuclear reactor.

  4. The Big Improvement in PISA 2009 Reading Achievements in Serbia: Improvement of the Quality of Education or Something Else?

    Directory of Open Access Journals (Sweden)

    Dragica Pavlović Babić

    2011-01-01

    Full Text Available The PISA 2009 results in Serbia show a big improvement in reading literacy compared to 2006 – the average score is 41 points higher, which is equal to the effect of a whole year of schooling in OECD countries and represents the second highest improvement ever recorded in a PISA study. In the present paper, we discuss potential reasons for such a big improvement based on analysis of the PISA 2009 reading achievements in different countries, with a special focus on countries from the same region (Croatia, Slovenia, Montenegro, Bulgaria, Romania and Albania. The analysis shows that the largest part of the improvement was realised at lower achieving levels, suggesting that the dominant method of teaching in schools is a traditional method oriented towards the acquisition and reproduction of academic knowledge. Findings of data analysis support the conclusion that the improvement is mainly the result of certain contextual factors, such as higher student motivation and a high level of official support for the PISA study in Serbia, rather than representing a real improvement in the quality of education.

  5. The Science Education of the East Asian Regions--What We Can Learn from PISA

    Science.gov (United States)

    Lau, Kwok Chi

    2014-01-01

    The study has integrated the data from PISA 2006 to 2012 to give an overall picture of the cognitive and affective performances and pedagogy of East Asian regions on PISA scientific literacy. Attempts are made to account for their performances based on the PISA data and cultural characteristics. The cognitive science performance of East Asian…

  6. A worldwide survey of fast breeder reactors

    International Nuclear Information System (INIS)

    Hennies, H.H.

    1986-01-01

    While the completion of the SNR 300 was accompanied by manifold discussions on questions relevant to safety and energy policies in the Federal Republic of Germany and as a result considerable scheduling delays and exceeding of budgets were recorded, breeder reactor technology has been progressing worldwide. The transition from the development phase with small trial reactors to the construction and operation of large performance reactors was completed systematically, in particular in France and the Soviet Union. Even though the uranium supply situation does not make a short-term and comprehensive employment of fast breeder reactors essential, technology has meanwhile been advanced to such a level and extensive operating experience is on hand to enable the construction and safe operation of fast breeder reactors. A positive answer has long been found to the question of the realization of a breeding rate to guarantee the breeding effect. There remain now the endeavors to achieve a reduction in investment and fuel cycle costs. (orig.) [de

  7. Method of fueling for a nuclear reactor

    International Nuclear Information System (INIS)

    Igarashi, Takao.

    1983-01-01

    Purpose: To enable the monitoring of reactor power with sufficient accuracy, upon starting even without existence of neutron source in case of a low average burnup degree in the reactor core. Constitution: Each of fuel assemblies is charged such that neutron source region monitors for the start-up system in a reactor core neutron instrumentation system having nuclear fuel assemblies and a neutron instrumentation system are surrounded with 4 or 16 fuel assemblies of a low burnup degree. Then, the average burnup degree of the fuel assemblies surrounding the neutron source region monitors are increased than the reactor core burnup degree, whereby neutrons released from the peripheral fuels are increased, sufficient number of neutron counts can be obtained even with no neutron sources upon start-up and the reactor power can be monitored at a sufficient accuracy. (Sekiya, K.)

  8. PROTOTIPO PARA RECUPERACIÓN SEMÁNTICA DE INFORMACIÓN DE PROYECTOS DE GRADO EN INGENIERÍA DE SISTEMAS CON BASE EN UN REPOSITORIO ONTOLÓGICO

    Directory of Open Access Journals (Sweden)

    Cristian Eduardo Padilla Castro

    2012-08-01

    Full Text Available En el presente artículo se da a conocer un modelo para trabajar en la Web en lo que concierne a la recuperación de información, mediante el uso de SPARQL, el lenguaje de recuperación estándar para la Web Semántica. Es descrita también la manera en que se puede hacer posible la evolución hacia la Web semántica, teniendo presente que ya existen herramientas como el framework jena implementado en Java y aplicaciones resource description framework ontology Web language como lenguajes de representación basados en XML, utilizados en la investigación para la construcción del prototipo que permite recuperar semánticamente información de proyectos de grado en ingeniería de sistemas a partir de un repositorio ontológico.

  9. Estudio del impacto en el nivel de comprensión lectora en inglés a través del uso de mapas conceptuales en estudiantes de 5to grado de primaria

    OpenAIRE

    Vega Bello, Ana Lilia

    2015-01-01

    Con la posibilidad de tener transversalidad en el trabajo de los docentes del idioma inglés con los docentes frente a grupo y debido a la inserción de dicho idioma en primarias públicas, es que surge el cuestionamiento ¿Existe modificación en la comprensión lectora en idioma inglés al usar mapas conceptuales en la materia de Ciencias Naturales de 5to año de primaria? La presente investigación se aplicó a 60 estudiantes de 5to grado de primaria de una escuela pública en el Distrito Federal. Co...

  10. Investigación bibliométrica de los trabajos de grado sobre liderazgo en las facultades de psicología de la ciudad de Bogotá (Colombia

    Directory of Open Access Journals (Sweden)

    Mónica García Rubiano

    2016-01-01

    Full Text Available Esta investigación hace un análisis bibliométrico de los trabajos de grado sobre liderazgo, entre 2000 y 2011, en las facultades de psicología adscritas a la Asociación Colombiana de Facultades de Psicología (Ascofapsi en la ciudad de Bogotá. El muestreo usado es intencional o de conveniencia. El estudio es de tipo descriptivo. En él se realizan 1 un análisis desde la estadística descriptiva en el que se encuentra la frecuencia de los datos obtenidos y 2 un análisis lexicométrico de datos textuales que fue llevado a cabo con la ayuda del software SPAD®.

  11. REACTOR: a computer simulation for schools

    International Nuclear Information System (INIS)

    Squires, D.

    1985-01-01

    The paper concerns computer simulation of the operation of a nuclear reactor, for use in schools. The project was commissioned by UKAEA, and carried out by the Computers in the Curriculum Project, Chelsea College. The program, for an advanced gas cooled reactor, is briefly described. (U.K.)

  12. Análisis bibliométrico de los trabajos de grado del área organizacional de la Facultad de Psicología de la Universidad Santo Tomás

    Directory of Open Access Journals (Sweden)

    María Constanza Aguilar B.

    2007-01-01

    Full Text Available El propósito de esta investigación fue realizar un análisis bibliométrico de los trabajos de grado del área organizacional de la Facultad de Psicología de la Universidad Santo Tomás. Primero, se hizo una revisión todos los trabajos de grado de Psicología (1307 tesis de los cuales se seleccionaron 247 del área producidos durante 26 años, cerca del 19%, –período comprendido entre 1985-2005-. Luego, se diseñó una base de datos y de acuerdo con las variables previamente establecidas se sistematizaron los datos. El estudio fue de tipo descriptivo y se realizan dos tipos de análisis, uno de carácter descriptivo bibliométrico y el segundo, corresponde al análisis de datos textuales. Se encontró que de los 247 trabajos revisados se revelo que 1995 fue el año en el que se desarrollaron mayor número de tesis (50 trabajos; los enfoques teóricos de abordaje de las tesis son de: enfoque sistémico (51 trabajos seguidos por el enfoque cognitivo comportamental (26. Por último, se presento un valioso aporte metodológico, y es la inclusión del análisis de datos textual a la bibliometría, el cual revelo en primer lugar la relación entre la Psicología social y la Psicología organizacional; en segundo lugar se evidenciaron dos periodos donde las temáticas giran en torno a una visión clásica de la psicologia organizacional y en últimos 10 años un énfasis en una perspectiva critica de la psicologia de las organizaciones.

  13. Academic Resilience: What Schools and Countries Do to Help Disadvantaged Students Succeed in PISA. OECD Education Working Papers, No. 167

    Science.gov (United States)

    Agasisti, Tommaso; Avvisati, Francesco; Borgonovi, Francesca; Longobardi, Sergio

    2018-01-01

    Resilience refers to the capacity of individuals to prosper despite encountering adverse circumstances. This paper defines academic resilience as the ability of 15-year-old students from disadvantaged backgrounds to perform at a certain level in the Programme for International Student Assessment (PISA) in reading, mathematics and science that…

  14. Gestión de la investigación de proyectos de grado en ambientes virtuales a través de la estrategia de seminario de investigación

    Directory of Open Access Journals (Sweden)

    Ignacio Jaramillo Urrutia

    2008-02-01

    Full Text Available Este artículo describe el proceso de la estrategia de seminario de investigación, correspondiente al ciclo de profundización de la especialización virtual en diseño de ambientes de aprendizaje, por medio de la cual se pretende generar estrategias didácticas y metodológicas para que los estudiantes virtuales consoliden sus respectivos proyectos de grado. los resultados del estudio permiten precisar cómo, a través de la implementación de una estrategia de seminario virtual y experiencias de validación académica igualmente virtuales, se pueden generar acciones de carácter investigativo que impacten a su vez a comunidades que requieren ser inmersas en el universo de las nuevas tecnologías de la información y la comunicación.  

  15. Prevalencia y grado de pie plano según estado nutricional en niños escolares de las instituciones educativas Santa Isabel de Hungría y Santa Teresita de Jesús. Casma. 2010

    OpenAIRE

    Sánchez Reyna, Luis Fernando

    2016-01-01

    El objetivo del estudio fue establecer la prevalencia y grado de pie plano en relación al estado nutricional en niños escolares matriculados en las Instituciones Educativas Santa Isabel de Hungría y Santa Teresita de Jesús de la ciudad de Casma. Este estudio cuantitativo, descriptivo y transversal evaluó a 321 niños escolares durante el año 2010. Se clasificó en niños eutróficos, con sobrepeso y obesidad según las tablas del IMC para la edad de la OMS, y en niños con pie normal o pie plano de...

  16. Using PISA as an International Benchmark in Standard Setting.

    Science.gov (United States)

    Phillips, Gary W; Jiang, Tao

    2015-01-01

    This study describes how the Programme for International Student Assessment (PISA) can be used to internationally benchmark state performance standards. The process is accomplished in three steps. First, PISA items are embedded in the administration of the state assessment and calibrated on the state scale. Second, the international item calibrations are then used to link the state scale to the PISA scale through common item linking. Third, the statistical linking results are used as part of the state standard setting process to help standard setting panelists determine how high their state standards need to be in order to be internationally competitive. This process was carried out in Delaware, Hawaii, and Oregon, in three subjects-science, mathematics and reading with initial results reported by Phillips and Jiang (2011). An in depth discussion of methods and results are reported in this article for one subject (mathematics) and one state (Hawaii).

  17. Simulation of a marine nuclear reactor

    International Nuclear Information System (INIS)

    Kusunoki, Tsuyoshi; Kyouya, Masahiko; Kobayashi, Hideo; Ochiai, Masaaki

    1995-01-01

    A Nuclear-powered ship Engineering Simulation SYstem (NESSY) has been developed by the Japan Atomic Energy Research Institute as an advanced design tool for research and development of future marine reactors. A marine reactor must respond to changing loads and to the ship's motions because of the ship's maneuvering and its presence in a marine environment. The NESSY has combined programs for the reactor plant behavior calculations and the ship's motion calculations. Thus, it can simulate reactor power fluctuations caused by changing loads and the ship's motions. It can also simulate the behavior of water in the pressurizer and steam generators. This water sloshes in response to the ship's motions. The performance of NESSY has been verified by comparing the simulation calculations with the measured data obtained by experiments performed using the nuclear ship Mutsu. The effects of changing loads and the ship's motions on the reactor behavior can be accurately simulated by NESSY

  18. Redes virtuales y apoyo social percibido en usuarios con discapacidad: análisis según la tipología, grado y etapa en la que se adquiere la discapacidad

    Directory of Open Access Journals (Sweden)

    Raquel Suriá Martínez

    2017-04-01

    Full Text Available La cantidad de redes sociales online dedicadas a intercambiar apoyo social se ha incrementado en los últimos años. No obstante, el estudio sobre la naturaleza y tipología de estos grupos para jóvenes con discapacidad es escaso. Los objetivos del presente estudio identifican el apoyo social percibido de los jóvenes usuarios de las redes sociales en estos espacios en función del grado, tipología y antigüedad de la discapacidad. Participaron 116 jóvenes con edades comprendidas entre 20 y 35 años (M = 28,22; DT = 4,02. Fueron clasificados en función de la tipología de la discapacidad (motora, intelectual, visual y auditiva. Contestaron la Escala de apoyo social percibido a través de las redes sociales. Este instrumento está compuesto por una escala de respuestas tipo Likert de cuatro puntos (0= nada, 4= mucho, de 15 ítems repartidos en dos factores. Los resultados muestran mayor percepción de apoyo en las redes sociales online entre los jóvenes con discapacidad motora y con mayor grado de discapacidad. Ello sugiere la importancia que tienen para los jóvenes con discapacidad las redes sociales online para intercambiar apoyo. Así, las redes online podrían servir como ayuda en los programas dirigidos a fomentar la integración social.

  19. Actinides burnup in a sodium fast reactor

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez S, J. R.; Pineda A, R.; Martinez C, E.; Alonso, G., E-mail: ramon.ramirez@inin.gob.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2017-09-15

    The burnup of actinides in a nuclear reactor is been proposed as part of an advanced nuclear fuel cycle, this process would close the fuel cycle recycling some of the radioactive material produced in the open nuclear fuel cycle. These actinides are found in the spent nuclear fuel from nuclear power reactors at the end of their burnup in the reactor. Previous studies of actinides recycling in thermal reactors show that would be possible reduce the amounts of actinides at least in 50% of the recycled amounts. in this work, the amounts of actinides that can be burned in a fast reactor is calculated, very interesting results surge from the calculations, first, the amounts of actinides generated by the fuel is higher than for thermal fuel and the composition of the actinides vector is different as in fuel for thermal reactor the main isotope is the {sup 237}Np in the fuel for fast reactor the main isotope is the {sup 241}Am, finally it is concluded that the fast reactor, also generates important amounts of waste. (Author)

  20. El Sistema de Acreditación de Carreras de Grado del MERCOSUR (ARCU-SUR en la Facultad de Agronomía de la Universidad de la República - Uruguay

    Directory of Open Access Journals (Sweden)

    Ernesto Domínguez Misa

    Full Text Available Resumen: La participación en el ARCU-SUR, plantea en las carreras el debate sobre la calidad y su aseguramiento, así como la respuesta institucional a la misma. Irrumpen en la agenda temas derivados como el reconocimiento de títulos, la nueva institucionalidad, la relación público - privado y universidad - estado. Este artículo realizará una revisión sobre los fundamentos, resultados e impactos producidos en la Facultad de Agronomía de la Universidad de la República, Uruguay, por el Mecanismo Experimental de Acreditación de Carreras de Grado del MERCOSUR (MEXA y el Sistema de Acreditación ARCU-SUR, centrándose en los efectos derivados, pero explora retrospectivamente la evolución institucional en las políticas de evaluación .

  1. Efecto del programa Tics y educación sexual sobre el grado de conocimientos y actitudes de los obstetras en relación a la educación sexual integral de los adolescentes

    OpenAIRE

    Vega Gonzales, Emilio Oswaldo

    2015-01-01

    El objetivo del presente proyecto fue determinar el efecto del uso de las Tecnologías de Información y Comunicación (TICs) sobre el grado de conocimientos y actitudes de los obstetras en relación a la educación sexual de los adolescentes, a través de la aplicación del programa “TICs y Educación Sexual”. La investigación fue de tipo pre-experimental (pretest y postest) y contó con el apoyo del Colegio Regional de Obstetras III Lima – Callao. La muestra estuvo conformada por 25 obstetras y los...

  2. The development of PISA reading competence in secondary education

    Directory of Open Access Journals (Sweden)

    Jovanović Vitomir

    2016-01-01

    Full Text Available The aim of the paper is to provide a contribution to answering the question about the most important predictors of progress in reading competence achieved by students after two years of secondary education, as well as whether the set of predictors of progress is different from the set of predictors of achievement in reading literacy test and school achievement measured via school grades. The students from the sample for the PISA 2009 study conducted in Serbia were tested again after two years by the PISA reading literacy test, quasi longitudinally, measuring achievement correlates at another time point. The realised sample included 20 secondary schools and 446 students. We selected fourteen predictors that, according to the studies so far, proved to have highest correlations with school achievement. The results have shown that the predictors explain only 13% of variance of the progress in reading literacy test (R=.36; R2=.13; F =12.97; p<.05 although they explain 49% of variance of achievement at it (R=.70; R2 197,18 =.49; F257,18 =12.97; p<.001. This opens up the issue of the importance of early learning for progress in reading competence. In both the first and the second analysis, the strongest predictor was the autonomous form of extrinsic motivation which, according to the self-determination theory, speaks about the importance of learning for future life and career. A somewhat different set of used predictors predicted school achievement measured via school grades. Using metacognitive strategies is not an important predictor of school achievement while it is the predictor of achievement in the reading literacy test. Together with the findings pointing towards the lower than expected correlation between achievement in reading literacy and school achievement (r=.39; p<0.001 and generally low progress of Serbia at this test compared to the estimated progress of the OECD countries, these results give grounds for the conclusion that our

  3. La presencia de PISA en la literatura científica y su tratamiento en la prensa diaria internacional

    Directory of Open Access Journals (Sweden)

    Antonio Luzón

    2013-01-01

    Full Text Available Este artículo examina y analiza la producción científica tanto en la literatura científica, como el uso público que se ha realizado del Programa para la Evaluación Internacional de los Estudiantes (PISA desarrollado por la OCDE. En concreto, comprueba qué influencia ha tenido PISA en la literatura científica desde su creación y ello se verifica a través de las publicaciones halladas a través de la Web of Science (WoS de Thomson-Scientific, que incluye diversas bases de datos: Science Citation Index (SCI, Social Sciences Citation Index (SSCI y Arts & Humanities Citation Index, (AHCI de Thomson Reuters así como en Scopus de Elsevier. También incide sobre la presencia de PISA en los cada vez más utilizados motores de búsqueda de cuarta generación como Google Scholar, de carácter abierto y gratuito. Al mismo tiempo, pretende comprobar la resonancia que tiene en la prensa diaria y su impacto mediático mundial que ha originado la publicación del último informe PISA (2009 en los principales diarios españoles e internacionales.

  4. AS "DESCRIÇÕES FINAS" DAS ANÁLISES SECUNDÁRIAS DO PISA

    Directory of Open Access Journals (Sweden)

    Radhika Gorur

    Full Text Available RESUMO: Os métodos da OCDE e do PISA para influenciar a política por meio dos rankings e do aconselhamento político estão bem documentados. Este artigo é especulativo e explora as implicações mais sutis e talvez mais profundas da evolução da base de dados do PISA, e da análise secundária que é realizada utilizando-a. Com base em conceitos dos Science and Technology Studies , este artigo sugere que o PISA reduz "objetos ontologicamente luxuriantes" em "objetos ontologicamente empobrecidos" por meio da padronização e simplificação. Libertos das suas amarras e traduzidos em inscrições, esses objetos ontologicamente empobrecidos são promíscuos, combinando-se livremente, de diferentes formas, com outros tantos objetos, através de espaços e tempos, tendo em vista a produção de lições para as políticas e as práticas. Neste artigo, sugiro que, embora essas relações promíscuas possam produzir afirmações matematicamente defensáveis, esses resultados podem ser ontologicamente um absurdo. Utilizando dados de entrevistas com especialistas da avaliação e com políticos, bem como análises secundárias publicadas, este artigo introduz algumas ideias sobre como podemos compreender o banco de dados do PISA e o seu uso em análises secundárias. O artigo argumenta que a análise secundária não é um exercício meramente matemático ou técnico, mas sociotécnico, e que, dada a sua influência e o seu alcance, intenta abrir as caixas negras do banco de dados do PISA e as práticas das análises secundárias, disponibilizando-as para uma análise e uma crítica sociológica e filosófica mais ampla.

  5. A new record for American Bullfrog (Lithobates catesbeianus in San Juan, Argentina Nuevo registro de rana toro americana (Lithobates catesbeianus en San Juan, Argentina

    Directory of Open Access Journals (Sweden)

    Eduardo Sanabria

    2011-03-01

    Full Text Available We report a new record of Lithobates catesbeianus (American bullfrog from Argentina. L. catesbeianus was first introduced to San Juan Province 11 years ago in Calingasta Department, where the habitat is pre-cordilleran. The new record is for Zonda Department, San Juan Province, in the Monte desert region. Here, L. catesbeianus uses artificial ponds for reproduction and tadpole development. These ponds receive water from an irrigation system that connects the whole agriculture land in the region. The tadpoles use the irrigation canals to move among ponds. We suggest that legislation should be established to prevent future invasions and to achieve sustainable management of the wild American bullfrog populations in San Juan. Prevention of future invasion and management of established populations of this species requires the cooperation of numerous stake holders.Se presenta un nuevo registro de Lithobates catesbeianus (rana toro americana en Argentina. L. catesbeianus fue introducida por primera vez a la provincia de San Juan hace 11 años en el Departamento Calingasta, donde el hábitat es pre-cordillerano. El nuevo registro es para el Departamento Zonda en la provincia de San Juan, en el desierto del Monte. En este sitio, L. catesbeianus usa estanques artificiales para la reproducción y desarrollo del renacuajo. Los estanques reciben agua de un sistema de riego que conecta todas las tierras de la agricultura en la región. Los renacuajos utilizan los canales de riego para moverse entre los estanques. Sugerimos que se establezcan leyes para prevenir invasiones futuras y para lograr un manejo integrado de las poblaciones silvestres de rana toro que se encuentran en San Juan. La prevención de futuras invasiones y el manejo de las poblaciones establecidas de esta especie requieren la cooperación de numerosas entidades tanto gubernamentales como privadas.

  6. Estudio constructivo y análisis de la Sacristía de la iglesia de San Miguel y San Sebastián

    OpenAIRE

    RUBIO MUÑOZ, RUBÉN

    2017-01-01

    La iglesia de San Miguel y San Sebastián, de Cardona y Pertusa, es un edificio erigido en el siglo XVIII, con anterioridad a la creación de la Academia de Bellas Artes, en que se produce la transición de la arquitectura y los oficios relacionados con la construcción. La Sacristía de la citada iglesia, de planta de cruz griega y con cúpula centra, es uno de los mejores ejemplos de la arquitectura del periodo y que, por desgracia, poco conocida. En el TFG se pretende realizar un exhaustivo l...

  7. "Why bother so incredibly much?": student perspectives on PISA science assignments

    Science.gov (United States)

    Serder, Margareta; Jakobsson, Anders

    2015-09-01

    Large-scale assessment, such as the Programme for International Assessment (PISA), plays an increasingly important role in current educational practice and politics. However, many scholars have questioned the validity and reliability of the tests and the extent to which they actually constitute trustworthy representations of students' knowledge. In the light of such critical voices the present article adopts a sociocultural perspective of human knowledge and action in order to explore the encounters between students and the science test assignments with which their knowledge is tested. Of particular interest in this study are the described "real-life situations" presented as the relevant background in which scientific literacy is assessed in PISA. According to the sociocultural theoretical onset the methodology used to approach the students' meaning making of the image of science as portrayed in the test were collaborative situations in which students work in small groups with units of PISA assignments, enabling a study of student-assignment encounters in action. The data we worked with consists of video-recordings from 71 Swedish 15-year-old students working with three released units from the PISA science test. According to our analysis, the "real-life situations" described in the test emerge as problematic in the students' meaning-making. This is demonstrated for instance by the students' positioning themselves as being different from and opposed to the fictional pictured students who appear in the backstories of the test. This article provides examples of how the scientific and academic language used by the fictional students in the assignments mediates distance and resistance among the students. The fictional students' use of strict scientific language and methods in day-to-day life situations leads them to be perceived as "little scientists" and as elite stereotypes of the scientific culture. We conclude that, by using assignments of this type, measurements of

  8. Establishing a Radiation Protection Programme for a Research Reactor

    International Nuclear Information System (INIS)

    Abdallah, M. M.

    2014-04-01

    The nature and intensity of radiation from the operation of a research reactor depend on the type of reactor, its design features and its operational history. The protection of workers from the harmful effect of radiation must therefore be of paramount importance to any operating organization of a research reactor. This project report attempts to establish an operational radiation protection programme for a research reactor using the Ghana Research Reactor-1 as a case study. (au)

  9. A new small-angle neutron scattering spectrometer at China Mianyang research reactor

    Energy Technology Data Exchange (ETDEWEB)

    Peng, Mei, E-mail: pm740509@163.com; Sun, Liangwei; Chen, Liang; Sun, Guangai; Chen, Bo; Xie, Chaomei; Xia, Qingzhong; Yan, Guanyun; Tian, Qiang; Huang, Chaoqiang; Pang, Beibei; Zhang, Ying; Wang, Yun; Liu, Yaoguang; Kang, Wu; Gong, Jian

    2016-02-21

    A new pinhole small-angle neutron scattering (SANS) spectrometer, installed at the cold neutron source of the 20 MW China Mianyang Research Reactor (CMRR) in the Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, has been put into use since 2014. The spectrometer is equipped with a multi-blade mechanical velocity selector, a multi-beam collimation system, and a two-dimensional He-3 position sensitive neutron detector. The q-range of the spectrometer covers from 0.01 nm{sup −1} to 5.0 nm{sup −1}. In this paper, the design and characteristics of the SANS spectrometer are described. The q-resolution calculations, together with calibration measurements of silver behenate and a dispersion of nearly monodisperse poly-methyl-methacrylate nanoparticles indicate that our SANS spectrometer has a good performance and is now in routine service. - Highlights: • A new SANS spectrometer has been put into use since 2014 in China. • One MBR selector possesses a higher resolution compared with traditional selector is used. • The spectrometer has a good performance and is now in routinely service.

  10. Riesgo familiar total en salud y grado de salud familiar en las familias de los pacientes con diagnostico de síndrome coronario agudo

    Directory of Open Access Journals (Sweden)

    Ruby Elizabeth Vargas-Toloza

    2012-12-01

    Full Text Available Objetivo: identificar el riesgo familiar total en salud y grado de salud familiar en las familias de los pacientes con diagnóstico de síndrome coronario agudo de la Clínica San José de Cúcuta. Materiales y Métodos: Estudio cuantitativo, de tipo descriptivo transversal; en el que se calculó una muestra de 165 familias por muestreo no probabilístico. La recolección de la información se realizo por medio de los instrumentos RFT: 5-33 y ISF GEN-21 donde se clasifico el riesgo familiar total y se percibió el grado de salud familiar. Resultados: se evidencia que las familias están conformes con el modelo habitual de organización familiar en función de cada uno de los integrantes y del grupo como tal. Lo cual nos indica que toda la familia del paciente coronario lo ayuda a sobrellevar el proceso de salud-enfermedad y tiene claro el papel que juega dentro de ella permitiendo así la funcionalidad y la unidad que requiere este tipo de pacientes para su rehabilitación. Conclusiones: los factores de riesgo biológicos, sociales y del medio ambiente que clasifican a la población estudiada dentro de riesgo familiar bajo. Se evidenció un alto grado de organización y satisfacción asegurando en gran medida la adaptación y el éxito de las familias frente al proceso de salud- enfermedad por la que atraviesan algunos de los miembros especialmente si es un paciente coronario.

  11. A new MTR fuel for a new MTR reactor: UMo for the Jules Horowitz reactor

    Energy Technology Data Exchange (ETDEWEB)

    Guigon, B. [CEA Cadarache, Dir. de l' Energie Nucleaire DEN, Reacteur Jules Horowitz, 13 - Saint-Paul-lez-Durance (France); Vacelet, H. [Compagnie pour l' Etude et la Realisation de Combustibles Atomiques, CERCA, Etablissement de Romans, 26 (France); Dornbusch, D. [Technicatome, Service d' Architecture Generale, 13 - Aix-en-Provence (France)

    2003-07-01

    Within some years, the Jules Horowitz Reactor will be the only working experimental reactor (material and fuel testing reactor) in France. It will have to provide facilities for a wide range of needs: from activation analysis to power reactor fuel qualification. In this paper will be presented the main characteristics of the Jules Horowitz Reactor: its total power, neutron flux, fuel element... Safety criteria will be explained. Finally merits and disadvantages of UMo compared to the standard U{sub 3}Si{sub 2} fuel will be discussed. (authors)

  12. Building up a reactor industry

    International Nuclear Information System (INIS)

    Mattick, W.

    1977-01-01

    The reactor industry has in common with any other industry the need to meet a requirement in a specific market with a specific product. However, it is distinguished from old established industries by its origins, its young age and by the fact that most of its development costs were paid by the governments in all developed countries. A comparison of the origins and the history of companies in this field in the United Kingdom , France and the Federal Republic of Germany should merit special interest. A historical survey of this kind is presented in this contribution. If a technological project acquires international ramifications in order to diminish the market risk, national goals frequently must give way to a common objective. Problems involving practical application must be solved by joint efforts of industrial consortia. In this way, these industries can both offer a commercially viable product and take into account national characteristics or habits in such a way as to improve the overall cost-benefit situation with all parties involved. (orig.) [de

  13. Edificio Roca, calle San Vicente, 32 (1934-36) Valencia: proyecto de interiorismo

    OpenAIRE

    CARBONELL SANTACRUZ, MARÍA DE LA LUZ

    2012-01-01

    Este Proyecto Final de Grado trata sobre la reutilización del Edificio Roca (1934-36), que está situado en la calle San Vicente, 32, de Valencia y es obra del arquitecto Vicente Valls Gadea (1985-1922). El proyecto se articula en tres fases. La fase inicial comienza con el estudio histórico de la ciudad de Valencia. A continuación trata de la arquitectura europea a partir de la Revolución Industrial y el movimiento arquitectónico racionalista en Valencia. Por último, se estudia la calle...

  14. Production and use of {sup 18}F by TRIGA nuclear reactor: a first report

    Energy Technology Data Exchange (ETDEWEB)

    Burgio, N.; Ciavola, C.; Festinesi, A.; Capannesi, G. [ENEA, Centro Ricerche Casaccia, Rome (Italy). Dipt. Innovazione

    1999-02-01

    The irradiation and radiochemical facilities at public research centre can contribute to the start up of the regional PET centre. In particular, the TRIGA reactor of Casaccia Research Centre could produce a sufficient amount of {sup 18}F to start up a PET centre and successively integrated the cyclotron production. This report establishes, in the light of the preliminary experimental works, a guideline to the reactor`s production and extraction of {sup 18}F in a convenient form for the synthesis of the most representative PET radiopharmaceutical: {sup 18}F-FDG. [Italiano] Le facilities di irraggiamento e i laboratori Radiochimici dei Centri Statali di Ricerca possono contribuire allo sviluppo di centri regionali PET (Tomografia ed Emissione Positronica). In particolare, il reattore TRIGA del Centro Ricerca Casaccia potrebbe produrre un quantitativo di {sup 18}F sufficiente alle attivita` formative propedeutiche al centro PET che, successivamente sarebbe in grado di avviare una propria produzione da ciclotrone. Questo rapporto stabilisce le linee guida sperimentali per la produzione del {sup 18}F da reattore nucleare e la sua successiva estrazione in una forma conveniente per la sintesi del piu` rappresentativo dei radiofarmaci PET: il {sup 18}F-FDG.

  15. Clinical Evaluation of Perspiration Reducing Effects of a Kampo Formula, Shigyaku-san, on Palmoplantar Hidrosis

    Directory of Open Access Journals (Sweden)

    Fumino Ninomiya

    2008-01-01

    Full Text Available Palmoplantar hidrosis is common in patients who are susceptible to strains on the autonomic nervous system, and stress and mental strain have been proven to produce sweating in this population. Shigyaku-san (Sini san, TJ-35: Tsumura & Co. is effective for relieving stagnation of ‘liver Qi and vital energy’ in traditional Chinese medicine theory; this brings about improvement of palmoplantar hidrosis. The effect of Shigyaku-san on 40 patients was evaluated based on changes in palmoplantar sweat volume and skin temperature before and after stress loading. We also measured changes in the palmoplantar sweat volume and skin temperature due to stress load in 35 healthy controls who did not receive Shigyaku-san. Before treatment, the pre-stress sweat volume in patients was larger than that in healthy controls, however, after Shigyaku-san treatment, their pre-stress sweat volume decreased. With stress, the sweat volume increased in both patients and controls, but the net increase in the patients was larger than that in healthy controls. After Shigyaku-san treatment, the net increase of sweat volume due to stress was smaller than that of pretreatment, however, it did not show a significant difference with that of healthy controls. The palmoplantar skin temperature of the patients before treatment was lower than that of healthy controls. Palmoplantar skin temperature rose with stress loading in healthy controls, but decreased in pretreatment patients. Shigyaku-san treatment reduced the palmoplantar perspiration in palmoplantar hidrosis patients at rest and under stress. Furthermore, it also improved other serious complications, especially coldness of the extremities.

  16. Preliminary design of a Binary Breeder Reactor

    International Nuclear Information System (INIS)

    Garcia C, E. Y.; Francois, J. L.; Lopez S, R. C.

    2014-10-01

    A binary breeder reactor (BBR) is a reactor that by means of the transmutation and fission process can operates through the depleted uranium burning with a small quantity of fissile material. The advantages of a BBR with relation to other nuclear reactor types are numerous, taking into account their capacity to operate for a long time without requiring fuel reload or re-arrangement. In this work four different simulations are shown carried out with the MCNPX code with libraries Jeff-3.1 to 1200 K. The objective of this study is to compare two different models of BBR: a spherical reactor and a cylindrical one, using two fuel cycles for each one of them (U-Pu and Th-U) and different reflectors for the two different geometries. For all the models a super-criticality state was obtained at least 10.9 years without carrying out some fuel re-arrangement or reload. The plutonium-239 production was achieved in the models where natural uranium was used in the breeding area, while the production of uranium-233 was observed in the cases where thorium was used in the fertile area. Finally, a behavior of stationary wave reactor was observed inside the models of spherical reactor when contemplating the power uniform increment in the breeding area, while inside the cylindrical models was observed the behavior of a traveling wave reactor when registering the displacement of the burnt wave along the cylindrical model. (Author)

  17. Design of a multipurpose research reactor

    International Nuclear Information System (INIS)

    Sanchez Rios, A.A.

    1990-01-01

    The availability of a research reactor is essential in any endeavor to improve the execution of a nuclear programme, since it is a very versatile tool which can make a decisive contribution to a country's scientific and technological development. Because of their design, however, many existing research reactors are poorly adapted to certain uses. In some nuclear research centres, especially in the advanced countries, changes have been made in the original designs or new research prototypes have been designed for specific purposes. These modifications have proven very costly and therefore beyond the reach of developing countries. For this reason, what the research institutes in such countries need is a single sufficiently versatile nuclear plant capable of meeting the requirements of a nuclear research programme at a reasonable cost. This is precisely what a multipurpose reactor does. The Mexican National Nuclear Research Institute (ININ) plans to design and build a multipurpose research reactor capable at the same time of being used for the development of reactor design skills and for testing nuclear materials and fuels, for radioisotopes production, for nuclear power studies and basic scientific research, for specialized training, and so on. For this design work on the ININ Multipurpose Research Reactor, collaborative relations have been established with various international organizations possessing experience in nuclear reactor design: Atomehnergoeksport of the USSR: Atomic Energy of Canada Limited (AECL); General Atomics (GA) of the USA; and Japan Atomic Energy Research Institute

  18. A trolley mounted magazine for reactor maintenance

    Energy Technology Data Exchange (ETDEWEB)

    Brennan, P.J.; Madani, M.; Ridgway, G.H. [GE Hitachi Nuclear Energy Canada, Peterborough, Ontario (Canada)], E-mail: patrick1.brennan@ge.com, mehdi.madani@ge.com, guy.ridgway@ge.com; Lundy, E.; Knight, D. [IM and CS (Inspection, Maintenance and Commerical Services), Ontario Power Generation, Ajax, Ontario (Canada)], E-mail: erroll.lundy@opg.com, david.knight@opg.com

    2009-03-15

    This paper describes the design of a mechanism incorporating a rotary magazine to be mounted on a fuelling machine transport trolley for use at a Darlington reactor during a feeder replacement or maintenance outage. The magazine stores reactor channel maintenance components, such as channel isolation plugs and vented closure plugs, in twelve available magazine channels. Use of the magazine rather than a fuelling machine reduces the time required to transfer such components between the Central Service Area and reactor channels. Component transfers are accomplished by locking the fuelling machine onto one of the magazine channels and using a local controller to execute commands received from the fuel handling control system. (author)

  19. A trolley mounted magazine for reactor maintenance

    Energy Technology Data Exchange (ETDEWEB)

    Brennan, P.J.; Madani, M.; Ridgway, G.H., E-mail: patrick1.brennan@ge.com, E-mail: mehdi.madani@ge.com, E-mail: guy.ridgway@ge.com [GE Hitachi Nuclear Energy Canada, Peterborough, Ontario (Canada); Lundy, E.; Knight, D., E-mail: erroll.lundy@opg.com, E-mail: david.knight@opg.com [Ontario Power Generation, Inspection, Maintenance and Commercial Services, Ajax, Ontario (Canada)

    2008-07-01

    This paper describes the design of a mechanism incorporating a rotary magazine to be mounted on a fuelling machine transport trolley for use at a Darlington reactor during a feeder replacement or maintenance outage. The magazine stores reactor channel maintenance components, such as channel isolation plugs and vented closure plugs, in twelve available magazine channels. Use of the magazine rather than a fuelling machine reduces the time required to transfer such components between the Central Service Area and reactor channels. Component transfers are accomplished by locking the fuelling machine onto one of the magazine channels and using a local controller to execute commands received from the fuel handling control system. (author)

  20. A trolley mounted magazine for reactor maintenance

    International Nuclear Information System (INIS)

    Brennan, P.J.; Madani, M.; Ridgway, G.H.; Lundy, E.; Knight, D.

    2009-01-01

    This paper describes the design of a mechanism incorporating a rotary magazine to be mounted on a fuelling machine transport trolley for use at a Darlington reactor during a feeder replacement or maintenance outage. The magazine stores reactor channel maintenance components, such as channel isolation plugs and vented closure plugs, in twelve available magazine channels. Use of the magazine rather than a fuelling machine reduces the time required to transfer such components between the Central Service Area and reactor channels. Component transfers are accomplished by locking the fuelling machine onto one of the magazine channels and using a local controller to execute commands received from the fuel handling control system. (author)

  1. A trolley mounted magazine for reactor maintenance

    International Nuclear Information System (INIS)

    Brennan, P.J.; Madani, M.; Ridgway, G.H.; Lundy, E.; Knight, D.

    2008-01-01

    This paper describes the design of a mechanism incorporating a rotary magazine to be mounted on a fuelling machine transport trolley for use at a Darlington reactor during a feeder replacement or maintenance outage. The magazine stores reactor channel maintenance components, such as channel isolation plugs and vented closure plugs, in twelve available magazine channels. Use of the magazine rather than a fuelling machine reduces the time required to transfer such components between the Central Service Area and reactor channels. Component transfers are accomplished by locking the fuelling machine onto one of the magazine channels and using a local controller to execute commands received from the fuel handling control system. (author)

  2. Yacimientos de Celestina en la Plataforma Valles-San Luis Potosí

    OpenAIRE

    Rocha Rocha, Macario

    2008-01-01

    En la zona de estudio, la Plataforma Valles-San Luis Potosí (PVSLP), existen depósitos de celestina; las características geotectónicas de la zona, hacen pensar que estos depósitos se asocian con evaporitas del Jurásico Superior-Cretácico Inferior. La mineralización de celestina arma en la Formación El Abra y en menor grado la Formación Indidura, en forma de vetas, mantos, zonas de brecha y cuerpos irregulares. La mineralogía consiste básicamente de celestina y algunos minerales...

  3. LAS HABILIDADES DEL PENSAMIENTO Y EL APRENDIZAJE SIGNIFICATIVO EN MATEMÁTICA, DE ESCOLARES DE QUINTO GRADO EN COSTA RICA

    Directory of Open Access Journals (Sweden)

    Natalia Araya Ramírez

    2014-01-01

    Full Text Available Este es un artículo en el cual se analizó cómo las habilidades de pensamiento de la observación, la inducción, el razonamiento hipotético-deductivo y la abstracción en la resolución de problemas, se presentan y potencian en los escolares de quinto grado, y cómo impactan en el aprendizaje al ser estimuladas durante el proceso de mediación pedagógica, en una escuela pública de la Dirección Regional de San José, circuito 02, en 2012. La metodología para recolectar la información consistió en: aplicar un pretest y un postest a 2 grupos de quinto grado (uno era el grupo control y el otro, el experimental, la muestra total fue de 60 estudiantes. Los test contaban con ejercicios para evaluar los procesos que intervienen en las habilidades del pensamiento investigadas; luego de aplicar el pretest al grupo experimental, se administró un plan institucional didáctico inteligente en matemática, con un enfoque constructivista; asimismo se sistematizaron los logros de los discentes en un diario de campo, y en una hoja de observación se anotaron los roles del educando y el docente, mientras se desarrollaba la lección. Finalmente, se entrevistó a una docente de quinto grado del grupo control, que imparte la asignatura de matemática. Los resultados obtenidos reflejaron que, si los procesos que involucran las habilidades del pensamiento son potenciados, el educando adquiere conocimientos y habilidades cada vez más complejas, que le permitan tener conciencia de cómo aprende. Se concluye que es necesario establecer en el aprendizaje de la matemática, un programa gradual para potenciar las habilidades de pensamiento por nivel escolar, respetando la madurez y el nivel cognitivo de los educandos.

  4. Sampling system for a boiling reactor NPP

    International Nuclear Information System (INIS)

    Zabelin, A.I.; Yakovleva, E.D.; Solov'ev, Yu.A.

    1976-01-01

    Investigations and pilot running of the nuclear power plant with a VK-50 boiling reactor reveal the necessity of normalizing the design system of water sampling and of mandatory replacement of the needle-type throttle device by a helical one. A method for designing a helical throttle device has been worked out. The quantitative characteristics of depositions of corrosion products along the line of reactor water sampling are presented. Recommendations are given on the organizaton of the sampling system of a nuclear power plant with BWR type reactors

  5. Realizing a Progressive Pedagogy: A Comparative Case Study of Two Reggio Emilia Preschools in San Francisco

    Science.gov (United States)

    Abdelfattah, Marwa

    2015-01-01

    This study aims to uncover how a particular imported philosophy of early childhood education, Reggio Emilia, is implemented in the context of one public and one private preschool in San Francisco. The philosophy of Reggio Emilia is believed to be progressive and to be developmentally appropriate for children in early childhood. The study involved…

  6. A swivelling transfer device for nuclear reactors

    International Nuclear Information System (INIS)

    Allain, Albert; Mulot, Pierre; Filloleau, Etienne

    1974-01-01

    The invention relates to a swivelling transfer device for fuel-assemblies. According to the invention, the device comprises, within a protective enclosure, a swivelling system comprising two sets of rails rotatable about an axis and so arranged that the lower and thereof penetrates into the extensions of the extremities of ramps dipped into the reactor and into a storage enclosure. This can apply to the transfer of nuclear reactor fuel assemblies, in particular for reactors of the molten sodium fast neutron type [fr

  7. Diseño de una formulación de ciclosporina A solución oral con alto grado de dispersión Design of a formulation of highly dispersed cyclosporine A oral solution

    Directory of Open Access Journals (Sweden)

    Suslebys Salomón Izquierdo

    2013-03-01

    Full Text Available La ciclosporina A (CsA por sus propiedades inmunosupresoras es empleada en el transplante de órganos sólidos, médula ósea, así como para determinados estadíos de ciertas enfermedades autoinmunes. En Cuba, se comercializa una solución oral que presenta problemas de absorción gastrointestinal. Objetivos: lograr una microemulsión preconcentrada conteniendo ciclosporina A con alto grado de dispersión, igual o mayor que la formulación comercial. Métodos: se realizó un estudio de porcentajes de los emulgentes y el balance hidrófilo lipófilo (HLB, en los intervalos que permitieran obtener sistemas automicroemulsionables a través de un diseño factorial multinivel. Se empleó el porciento de transmitancia como variable de respuesta en la determinación del grado de dispersión de la formulación. También se realizó la evaluación de las características organolépticas de la formulación seleccionada, el estudio reológico, el conteo microbiano y la efectividad antimicrobiana. Resultados: los factores estudiados tienen influencia significativa sobre el porcentaje de transmitancia, la formulación con mayor grado de dispersión se logró empleando un 60 % de emulgentes junto a un HLB de 11,5 con valores de transmitancia de 95,03 %, significativamente mayor que el del producto líder en formato de cápsulas blandas que fue de 84,6 %. Organolépticamente el producto cumple con las características de líquido transparente, brillante y sin partículas en suspensión, con comportamiento Newtoniano desde el punto de vista reológico. El conteo de bacterias y hongos cumplió con los requisitos establecidos en la Farmacopea de los Estados Unidos para soluciones orales. Conclusiones: se logró una microemulsión preconcentrada de CsA en solución bebible con alto grado de dispersión, cumpliendo con los requisitos físicos y microbiológicos establecidos para este tipo de forma farmacéutica.Cyclosporine A (CsA, due to its immunosuppressive

  8. Psychiatric Disorders and Substance Use in Homeless Youth: A Preliminary Comparison of San Francisco and Chicago

    Directory of Open Access Journals (Sweden)

    Ernika G. Quimby

    2012-08-01

    Full Text Available Youth homelessness is a growing problem in the United States. The experience of homelessness appears to have numerous adverse consequences, including psychiatric and substance use disorders. This study compared the frequencies of psychiatric disorders, including substance use, between homeless youth (18–24 years-old in San Francisco (N = 31 and Chicago (N = 56. Subjects were administered the Mini International Neuropsychiatric Interview (M.I.N.I. to assess DSM-IV-TR diagnoses and substance use disorders. Eighty-seven percent of the San Francisco youth, and 81% of the Chicago youth met criteria for at least one M.I.N.I. psychiatric diagnosis. Nearly two-thirds of the youth in both samples met criteria for a mood disorder. Approximately one-third met criteria for an anxiety disorder. Thirty-two percent of the San Francisco sample and 18% of the Chicago met criteria for Antisocial Personality Disorder. Approximately 84% of the San Francisco youth and 48% of the Chicago youth met criteria for a substance-related disorder, and more substances were used by San Francisco youth. In conclusion, the high rate of psychiatric disorders in homeless youth provides clear evidence that the mental health needs of this population are significant. Implications are discussed.

  9. Neutronic parameters calculations of a CANDU reactor

    International Nuclear Information System (INIS)

    Zamonsky, G.

    1991-01-01

    Neutronic calculations that reproduce in a simplified way some aspects of a CANDU reactor design were performed. Starting from some prefixed reactor parameters, cylindrical and uniform iron adjuster rods were designed. An appropriate refueling scheme was established, defininig in a 2 zones model their dimensions and exit burnups. The calculations have been done using the codes WIMS-D4 (cell), SNOD (reactivity device simulations) and PUMA (reactor). Comparing with similar calculations done with codes and models usually employed for CANDU design, it is concluded that the models and methods used are appropriate. (Author) [es

  10. ADVANCED CONTROL FOR A ETHYLENE REACTOR

    Directory of Open Access Journals (Sweden)

    Dumitru POPESCU

    2017-06-01

    Full Text Available The main objective of this work is the design and implementation of control solutions for petrochemical processes, namely the control and optimization of a pyrolysis reactor, the key-installation in the petrochemical industry. We present the technological characteristics of this petrochemical process and some aspects about the proposed control system solution for the ethylene plant. Finally, an optimal operating point for the reactor is found, considering that the process has a nonlinear multi-variable structure. The results have been implemented on an assembly of pyrolysis reactors on a petrochemical platform from Romania.

  11. Optimization of a sequence of reactors

    DEFF Research Database (Denmark)

    Vidal, Rene Victor Valqui

    1991-01-01

    Concerns the optimal production of sulphuric acid in a sequence of reactors. Using a suitable approximation to the objective function, this problem can easily be solved using the maximum principle. A numerical example documents the applicability of the suggested approach...

  12. SOLASE: a conceptual laser fusion reactor design

    International Nuclear Information System (INIS)

    Conn, R.W.; Abdel-Khalik, S.I.; Moses, G.A.

    1977-12-01

    The SOLASE conceptual laser fusion reactor has been designed to elucidate the technological problems posed by inertial confinement fusion ractors. This report contains a detailed description of all aspects of the study including the physics of pellet implosion and burn, optics and target illumination, last mirror design, laser system analysis, cavity design, pellet fabrication and delivery, vacuum system requirements, blanket design, thermal hydraulics, tritium analysis, neutronics calculations, radiation effects, stress analysis, shield design, reactor and plant building layout, maintenance procedures, and power cycle design. The reactor is designed as a 1000 MW/sub e/ unit for central station electric power generation

  13. A study of reactor vessel integrity assessment

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jae Hoon [Korea Institute of Nuclear Safety, Taejon (Korea, Republic of); Kim, Jong Kyung; Shin, Chang Ho; Seo, Bo Kyun [Hanyang Univ., Seoul (Korea, Republic of)

    1999-02-15

    The fast neutron fluence at the Reactor Pressure Vessel(RPV) of KNGR designed for 60 years lifetime was calculated by full-scope Monte Carlo simulation for reactor vessel integrity assessment. KNGR core geometry was modeled on a three-dimensional representation of the one-sixteenth of the reactor in-vessel component. Each fuel assemblies were modeled explicitly, and each fuel pins were axially divided into 5 segments. The maximum flux of 4.3 x 10{sup 10} neutrons/cm{sup 2}. sec at the RPV was obtained by tallying neutrons crossing the beltline of inner surface of the RPV.

  14. Facility with a nuclear district heating reactor

    International Nuclear Information System (INIS)

    Straub, H.

    1988-01-01

    The district heating reactor has a pressure vessel which contains the reactor core and at least one coolant conducting primary heat carrier surrounded by a heat sink. The pressure vessel has two walls with a space between them. This space is connected with a container which contains air as heat isolating medium and water as heat conducting medium. During the normal reactor operation the space is filled by air from the container with the aid of a blower, whereas in the case of a break-down of the cooling system it is filled by water which flows out of the container by gravity after the blower has been switched off. The after-heat, generated in the reactor core during cooling break-down, is removed into the heat sink surrounding the pressure vessel in a safe and simple way. 6 figs

  15. Design of a nuclear reactor cooperative controller

    International Nuclear Information System (INIS)

    Alang-Rashid, N.K.; Heger, A.S.

    1991-01-01

    This paper describes the development of a fuzzy logic controller software package and explores the feasibility of its use in nuclear reactor operation. The controller complements reactor operator actions, and the operators can override the controller decisions. Techniques of providing learning capability to the controller are also being investigated to improve the reasoning and control skill of the controller. The fuzzy logic controller is implemented in C language and its overall structure is shown. The heart of the systems consists of a fuzzifier, a rule interpreter, and a defuzzifier. The controller is designed as a stand-alone package that can be interfaced to a simulated model of a nuclear reactor. Since no model is an accurate representation of the actual process being modeled, some tuning must be performed to use the controller in an actual reactor. This is accomplished using the learning feature of the controller

  16. Gas pollutant cleaning by a membrane reactor

    Directory of Open Access Journals (Sweden)

    Kaldis Sotiris

    2006-01-01

    Full Text Available An alternative technology for the removal of gas pollutants at the integrated gasification combined cycle process for power generation is the use of a catalytic membrane reactor. In the present study, ammonia decomposition in a catalytic reactor, with a simultaneous removal of hydrogen through a ceramic membrane, was investigated. A Ni/Al2O3 catalyst was prepared by the dry and wet impregnation method and characterized by the inductively coupled plasma method, scanning electron microscopy, X-ray diffraction, and N2 adsorption before and after activation. Commercially available a-Al2O3 membranes were also characterized and the permeabilities and permselectivities of H2, N2, and CO2 were measured by the variable volume method. In parallel with the experimental analysis, the necessary mathematical models were developed to describe the operation of the catalytic membrane reactor and to compare its performance with the conventional reactor. .

  17. Fuel assembly for a nuclear reactor

    International Nuclear Information System (INIS)

    Gjertsen, R.K.; Tower, S.N.; Huckestein, E.A.

    1982-01-01

    A fuel assembly for a nuclear reactor comprises a 5x5 array of guide tubes in a generally 20x20 array of fuel elements, the guide tubes being arranged to accommodate either control rods or water displacer rods. The fuel assembly has top and bottom Inconel (Registered Trade Mark) grids and intermediate Zircaloy grids in engagement with the guide tubes and supporting the fuel elements and guide tubes while allowing flow of reactor coolant through the assembly. (author)

  18. Using PISA 2003, Examining the Factors Affecting Students' Mathematics Achievement

    Science.gov (United States)

    Demir, Ibrahim; Kilic, Serpil

    2010-01-01

    The purpose of this study is to examine the effects of learning strategies on mathematics achievement. The sample was compiled from students who participated in Programme for International Student Assessment (PISA) in Turkey. The data consisted of 4493 15 years old Turkish students in 158 schools, and analyzed by two levels Bernoulli model as a…

  19. Science education, the science curriculum and PISA 2006

    DEFF Research Database (Denmark)

    Lavonen, Jari; Lie, Svein; MacDonald, Allyson

    2009-01-01

    Much is similar in the Nordic countries. But much is also different. The purpose of this anthology is to study the Nordic Countries from some different perspective by using data from PISA 2006. How different are the curricula and syllabuses? Is the impact of socio-economic status different...

  20. Auditoría Ambiental para productos lácteos San Pablito

    OpenAIRE

    Catucuago Toapanta, Luis Alberto

    2013-01-01

    Productos Lácteos San Pablito, se encuentra ubicada en la comunidad San Pablito de Agualongo, parroquia Tupigachi, cantón Pedro Moncayo en la parte norte de la provincia de Pichincha. Esta Auditoría Ambiental se centró en verificar el cumplimiento de la Legislación Ambiental y el Plan de Manejo Ambiental (PMA) propuesto en el Estudio de Impacto Ambiental (EsIA) del año 2011. La metodología del trabajo comprendió la planificación de la auditoría, visitas técnicas a la planta, evaluación del ma...

  1. Gas pollutant cleaning by a membrane reactor

    Energy Technology Data Exchange (ETDEWEB)

    George E. Skodras; Sotiris Kaldis; Savas G. Topis; Dimitris Koutsonikolas; George P. Sakellaropoulos [Aristotle University of Thessaloniki, Thessaloniki (Greece). Chemical Process Engineering Laboratory, Dept. of Chemical Engineering

    2006-07-01

    An alternative technology for the removal of gas pollutants at the intergrated gasification combined cycle process for power generation is the use of a catalytic membrane reactor. In the present study, ammonia decomposition in a catalytic reactor, with a simultaneous removal of hydrogen through a ceramic membrane, was investigated. A Ni/Al{sub 2}O{sub 3} catalyst was prepared by the dry and wet impregnation method and characterized by ICP, SEM, XRD and N{sub 2} adsorption before and after activation. Commercially available {alpha}-Al{sub 2}O{sub 3} membranes were also characterized and the permeabilities and permselectivities of H{sub 2}, N{sub 2} and CO{sub 2} were measured by the variable volume method. In parallel with the experimental analysis, the necessary mathematical models were developed to describe the operation of the catalytic membrane reactor and to compare its performance with the conventional reactor. 9 refs., 6 figs., 1 tab.

  2. Gas pollutant cleaning by a membrane reactor

    Energy Technology Data Exchange (ETDEWEB)

    Topis, S.; Koutsonikolas, D.; Kaldis, S. (and others) [Aristotle University of Thessaloniki, Thessaloniki (Greece). Dept. of Chemical Engineering

    2005-07-01

    An alternative technology for the removal of gas pollutants at the integrated gasification combined cycle process for power generation is the use of a catalytic membrane reactor. In the present study, ammonia decomposition in a catalytic reactor, with simultaneous removal of hydrogen through a ceramic membrane, was investigated. A Ni/Al{sub 2}O{sub 3} catalyst was prepared by the dry and wet impregnation method and characterized by ICP, SEM, XRD and N{sub 2} adsorption before and after activation. Commercially available {alpha}-Al{sub 2}O{sub 3} membranes were also characterized and the permeabilities and selectivities of H{sub 2}, N{sub 2} and CO{sub 2} were measured by the variable volume method. In parallel with the experimental analysis, the necessary mathematical models were developed to describe the operation of the catalytic membrane reactor and to compare its performance with the conventional reactor. 5 refs., 6 figs., 1 tab.

  3. A Critical Review of the Recent Improvements in Minimizing Nuclear Waste by Innovative Gas-Cooled Reactors

    Directory of Open Access Journals (Sweden)

    E. Bomboni

    2008-01-01

    Full Text Available This paper presents a critical review of the recent improvements in minimizing nuclear waste in terms of quantities, long-term activities, and radiotoxicities by innovative GCRs, with particular emphasis to the results obtained at the University of Pisa. Regarding these last items, in the frame of some EU projects (GCFR, PUMA, and RAPHAEL, we analyzed symbiotic fuel cycles coupling current LWRs with HTRs, finally closing the cycle by GCFRs. Particularly, we analyzed fertile-free and Pu-Th-based fuel in HTR: we improved plutonium exploitation also by optimizing Pu/Th ratios in the fuel loaded in an HTR. Then, we chose GCFRs to burn residual MA. We have started the calculations on simplified models, but we ended them using more “realistic” models of the reactors. In addition, we have added the GCFR multiple recycling option using keff calculations for all the reactors. As a conclusion, we can state that, coupling HTR with GCFR, the geological disposal issues concerning high-level radiotoxicity of MA can be considerably reduced.

  4. Preliminary Geologic Map of the San Fernando 7.5' Quadrangle, Southern California: A Digital Database

    Science.gov (United States)

    Yerkes, R.F.

    1997-01-01

    The city of San Fernando sits atop a structurally complex, sedimentologically diverse, and tectonically evolving late Tertiary-Quaternary basin situated within the Transverse Ranges of southern California. The surrounding San Fernando Valley (SFV) contains the headwaters of the Los Angeles River and its tributaries. Prior to the advent of flood control, the valley floor was composed of active alluvial fans and floodplains. Seasonal streams emanating from Pacoima and Big Tujunga Canyons drain the complex western San Gabriel Mountains and deposit coarse, highly permeable alluvium that contains generally high-quality ground water. The more shallow western part derives mainly from Tertiary and pre-Tertiary sedimentary rocks, and is underlain by less permeable, fine-grained deposits containing persistent shallow ground water and poorer water quality. Home of the 1971 San Fernando and the 1994 Northridge earthquakes, the SFV experienced near-record levels of strong ground motion in 1994 that caused widespread damage from strong shaking and ground failure. A new map of late Quaternary deposits of the San Fernando area shows that the SFV is a structural trough that has been filled from the sides, with the major source of sediment being large drainages in the San Gabriel Mountains. Deposition on the major alluvial fan of Tujunga Wash and Pacoima Wash, which issues from the San Gabriel Mountains, and on smaller fans, has been influenced by ongoing compressional tectonics in the valley. Late Pleistocene deposits have been cut by active faults and warped over growing folds. Holocene alluvial fans are locally ponded behind active uplifts. The resulting complex pattern of deposits has a major effect on liquefaction hazards. Young sandy sediments generally are highly susceptible to liquefaction where they are saturated, but the distribution of young deposits, their grain size characteristics, and the level of ground water all are complexly dependent on the tectonics of the valley

  5. Reactor refurbishment options for a changing climate

    Energy Technology Data Exchange (ETDEWEB)

    McNeish, D. [Bruce Power, Tiverton, Ontario (Canada)

    2012-07-01

    As the industry looks ahead to another generation of reactor refurbishment, it is acknowledged that the traditional way of Retubing a reactor is a daunting prospect for our investors and stakeholders. Innovations are required to mitigate the long downtime and large one-time investment associated with previous reactor refurbishments. These can take the shape of improvements to the Retube processes or by fundamentally changing the approach, e.g., calandria/shield tank replacement or partial Retubes. This session presents technical challenges that utilities need help resolving to arrive at a more attractive reactor refurbishment model. This includes issues related to calandria vessel fitness-for-service, the fuel channel replacement process, the feeder replacement process, life extension of fuel channels and feeders and complexities involving interfacing systems. (author)

  6. Reactor refurbishment options for a changing climate

    International Nuclear Information System (INIS)

    McNeish, D.

    2012-01-01

    As the industry looks ahead to another generation of reactor refurbishment, it is acknowledged that the traditional way of Retubing a reactor is a daunting prospect for our investors and stakeholders. Innovations are required to mitigate the long downtime and large one-time investment associated with previous reactor refurbishments. These can take the shape of improvements to the Retube processes or by fundamentally changing the approach, e.g., calandria/shield tank replacement or partial Retubes. This session presents technical challenges that utilities need help resolving to arrive at a more attractive reactor refurbishment model. This includes issues related to calandria vessel fitness-for-service, the fuel channel replacement process, the feeder replacement process, life extension of fuel channels and feeders and complexities involving interfacing systems. (author)

  7. Mechanical design of a PERMCAT reactor module

    Energy Technology Data Exchange (ETDEWEB)

    Tosti, S. [Associazione ENEA Euratom sulla Fusione, C.R. ENEA Frascati, Via E. Fermi 45, Frascati, Roma I-00044 (Italy)], E-mail: tosti@frascati.enea.it; Bettinali, L. [Associazione ENEA Euratom sulla Fusione, C.R. ENEA Frascati, Via E. Fermi 45, Frascati, Roma I-00044 (Italy); Borgognoni, F. [Tesi Sas, Via Bolzano 28, Rome (Italy); Murdoch, D.K. [EFDA CSU, Boltzmannstr. 2, D-85748 Garching bei Munchen (Germany)

    2007-02-15

    The PERMCAT is a membrane reactor proposed for processing fusion reactor plasma exhaust gas: tritium removal is obtained by isotopic swamping operating in counter-current mode. In this work, a membrane reactor using a permeator tube of length about 500 mm produced via diffusion welding of Pd-Ag thin foils is described. An appropriate mechanical design of the membrane module has been developed in order to avoid any significant compressive and bending stresses on the very long and thin wall permeator tube: two expanded bellows have been applied to the Pd-Ag tube, so that it has been pre-tensioned before operating. The elongation of the metal permeator under hydrogenation has been theoretically estimated and experimentally verified for properly designing the membrane reactor.

  8. A jewel in the desert: BHP Billiton's San Juan underground mine

    Energy Technology Data Exchange (ETDEWEB)

    Buchsbaum, L.

    2007-12-15

    The Navajo Nation is America's largest native American tribe by population and acreage, and is blessed with large tracks of good coal deposits. BHP Billiton's New Mexico Coal Co. is the largest in the Navajo regeneration area. The holdings comprise the San Juan underground mine, the La Plata surface mine, now in reclamation, and the expanding Navajo surface mine. The article recounts the recent history of the mines. It stresses the emphasis on sensitivity to and helping to sustain tribal culture, and also on safety. San Juan's longwall system is unique to the nation. It started up as an automated system from the outset. Problems caused by hydrogen sulfide are being tackled. San Juan has a bleederless ventilation system to minimise the risk of spontaneous combustion of methane and the atmospheric conditions in the mine are heavily monitored, especially within the gob areas. 3 photos.

  9. Space reactors - What is a kilogram

    International Nuclear Information System (INIS)

    Buden, D.; Angelo, J.; Ek, D.; Voss, S.

    1984-01-01

    The use of nuclear electric propulsion can triple the payloads to GEO for a single Shuttle launch. Life orbits of 300 years can be used to allow most of the fission and activation products to decay before a reactor reenters the biosphere. Enough radioactive materials remain with very long lifetimes to make it desirable to design the reactor to disperse upon reentry and little additional risk to the biosphere is introduced by initiating NEP operations from 300 km

  10. Space reactors: What is a kilogram

    International Nuclear Information System (INIS)

    Buden, D.; Angelo, J. Jr.; Ek, D.; Voss, S.

    1984-01-01

    The use of nuclear electric propulsion can triple payloads to GEO for a single Shuttle launch. Life orbits of 300 years can be used to allow most of the fission and activation products to decay before a reactor reenters the biosphere. Enough radioactive materials remain with very long lifetimes to make it desirable to design the reactor to disperse upon reentry and little additional risk to the biosphere is introduced by initiating NEP operations from 300 km

  11. Reactor vessel nozzle cracks: a photoelastic study

    International Nuclear Information System (INIS)

    Smith, C.W.

    1979-01-01

    A method consisting of a marriage between the ''frozen stress'' photoelastic approach and the local stress field equations of linear elastic fracture mechanics for estimating stress intensity factor distributions in three dimensional, finite cracked body problems is reviewed and extensions of the method are indicated. The method is then applied to the nuclear reactor vessel nozzle corner crack problem for both Intermediate Test Vessel and Boiling Water Reactor geometries. Results are compared with those of other investigators. 35 refs

  12. Estudio del grado de pureza de la nitrofurazona obtenida a partir de un derivado de la industria cañera cubana Study of the purity degree of Nitrofurazone obtained from a Cuban sugar cane industry byproduct

    Directory of Open Access Journals (Sweden)

    Adolfo L Brown Gómez

    2006-04-01

    Full Text Available Se estudió el grado de pureza a diferentes lotes de nitrofurazona sintetizados en el Instituto Cubano de Investigaciones de Derivados de la Caña de Azúcar (ICIDCA mediante la combinación de 3 técnicas analíticas: la cromatografía de placa delgada, la cromatografía líquida de alta resolución y la calorimetría diferencial de barrido. Se obtuvieron resultados satisfactorios que permiten evaluar la calidad de los productos y compararlos con productos competitivos a escala comercial con purezas entre el 98 y 100 %The purity degree of different Nitrofurazone batches synthetized in ICIDCA was studied using combination of three analytical techniques: the Thin Layer Chromatography (TLC, High Performance Liquid Chromatography (HPLC and Differential Scanning Calorimetry (DSC. Positive results were obtained that permit to evaluate quality of products and to compare them with competitive products at a market scale with 98 and 100 % purity degree

  13. Space reactors, a prospective for the future

    International Nuclear Information System (INIS)

    Wahlquist, E.; Voss, S.S.

    1989-01-01

    The power requirements for future space missions are increasing and alternate power systems will be required to meet these needs. Therefore, in the early 1980's a tri-agency space reactor program, the SP-100, was initiated that is capable of meeting the higher power requirements. To understand the current space reactor program, it is important to review it in the context of past space nuclear programs - including radioisotopes, nuclear rockets and reactors. Initial effort on these programs began in the mid-1950's. Radioisotope generators have been flown on a variety of missions and are continuing to be used. The space reactor and nuclear rocket programs were technically successful but were both terminated in 1973. The current SP-100 program builds on those earlier programs

  14. Performance of a multipurpose research electrochemical reactor

    International Nuclear Information System (INIS)

    Henquin, E.R.; Bisang, J.M.

    2011-01-01

    Highlights: → For this reactor configuration the current distribution is uniform. → For this reactor configuration with bipolar connection the leakage current is small. → The mass-transfer conditions are closely uniform along the electrode. → The fluidodynamic behaviour can be represented by the dispersion model. → This reactor represents a suitable device for laboratory trials. - Abstract: This paper reports on a multipurpose research electrochemical reactor with an innovative design feature, which is based on a filter press arrangement with inclined segmented electrodes and under a modular assembly. Under bipolar connection, the fraction of leakage current is lower than 4%, depending on the bipolar Wagner number, and the current distribution is closely uniform. When a turbulence promoter is used, the local mass-transfer coefficient shows a variation of ±10% with respect to its mean value. The fluidodynamics of the reactor responds to the dispersion model with a Peclet number higher than 10. It is concluded that this reactor is convenient for laboratory research.

  15. In the San Joaquin Valley, hardly a sprinkle

    International Nuclear Information System (INIS)

    Holson, L.M.

    1993-01-01

    California has declared its six-year drought over, but in the San Joaquin Valley, center of the state's $18.5 billion agriculture industry, it lives on. The two weeks of strong rain this winter that swelled reservoirs and piled snow on the mountains is only trickling toward the region's nearly 20,000 farms. Federal water officials are under heavy pressure from the Environmental Protection Agency, which wants to improve water quality, and are worried about the plight of endangered fish in the Sacramento River. So, on March 12 they announced they will send farmers only 40% of the water allotments they got before the drought. The rest is being held against possible shortages. For the once-green valley, another year without water has brought many farmers perilously close to extinction

  16. A model for nuclear research reactor dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Barati, Ramin, E-mail: Barati.ramin@aut.ac.ir; Setayeshi, Saeed, E-mail: setayesh@aut.ac.ir

    2013-09-15

    Highlights: • A thirty-fourth order model is used to simulate the dynamics of a research reactor. • We consider delayed neutrons fraction as a function of time. • Variable fuel and temperature reactivity coefficients are used. • WIMS, BORGES and CITVAP codes are used for initial condition calculations. • Results are in agreement with experimental data rather than common codes. -- Abstract: In this paper, a useful thirty-fourth order model is presented to simulate the kinetics and dynamics of a research reactor core. The model considers relevant physical phenomena that govern the core such as reactor kinetics, reactivity feedbacks due to coolant and fuel temperatures (Doppler effects) with variable reactivity coefficients, xenon, samarium, boron concentration, fuel burn up and thermal hydraulics. WIMS and CITVAP codes are used to extract neutron cross sections and calculate the initial neuron flux respectively. The purpose is to present a model with results similar to reality as much as possible with reducing common simplifications in reactor modeling to be used in different analyses such as reactor control, functional reliability and safety. The model predictions are qualified by comparing with experimental data, detailed simulations of reactivity insertion transients, and steady state for Tehran research reactor reported in the literature and satisfactory results have been obtained.

  17. LA UNIDAD DIDÁCTICA ORIENTADA A LA COMPRENSION DE LA IRRITABILIDAD COMO PATRON COMUN A TODOS LOS ORGANISMOS PARA FORTALECER LAS RELACIONES COOPERATIVAS EN LOS ESTUDIANTES DEL GRADO 902 DEL IED COLEGIO KIMY PERNIA DOMICO

    Directory of Open Access Journals (Sweden)

    Dennys Eliana Rodríguez Chiguasuque

    2015-12-01

    Full Text Available Se presenta la propuesta del diseño de una unidad didáctica que se realizó en el eje dinámica y mantenimiento de los sistemas de la Licenciatura en Biología de la Universidad Pedagógica Nacional, en donde se plantea el diseño de una unidad didáctica orientada a la comprensión de la irritabilidad como patrón común a todos los organismos, permitiendo fortalecer las relaciones cooperativas en los estudiantes del grado 902 del IED Colegio Kimy Pernía Domicó, ubicado en el barrio Bosa de la ciudad de Bogotá. En la cual, además del contenido temático, contemplara también un enfoque humanístico, crítico y reflexivo que les permitiera no solo el aprendizaje del patrón, sino la aplicabilidad del mismo en contexto; tomando la “educación problematizadora”. Por último se puede evidenciar que la unidad didáctica es de gran importancia para el proceso de enseñanza aprendizaje, además de ello le permite al maestro obtener habilidades en la planeación y planteamiento de actividades, lo que es de gran aporte para su formación profesional.

  18. SBWR: A simplified boiling water reactor

    International Nuclear Information System (INIS)

    Duncan, J.D.; Sawyer, C.D.; Lagache, M.P.

    1987-01-01

    An advanced light water reactor concept is being developed for possible application in the 1990's. The concept, known as SBWR is a boiling water reactor which uses natural circulation to provide flow to the reactor core. In an emergency, a gravity driven core cooling system is used. The reactor is depressurized and water from an elevated suppression pool flows by gravity to the reactor vessel to keep the reactor core covered. The concept also features a passive containment cooling system in which water flows by gravity to cool the suppression pool wall. No operator action is required for a period of at least three days. Use of these and other passive systems allows the elimination of emergency diesel generators, core cooling pumps and heat removal pumps which is expected to simplify the plant design, reduce costs and simplify licensing. The concept is being developed by General Electric, Bechtel and the Massachusetts Institute of Technology supported by the Electric Power Research Institute and the United States Department of Energy in the United States. In Japan, The Japan Atomic Power Company has a great interest in this concept

  19. Design options for a bunsen reactor.

    Energy Technology Data Exchange (ETDEWEB)

    Moore, Robert Charles

    2013-10-01

    This work is being performed for Matt Channon Consulting as part of the Sandia National Laboratories New Mexico Small Business Assistance Program (NMSBA). Matt Channon Consulting has requested Sandia's assistance in the design of a chemical Bunsen reactor for the reaction of SO2, I2 and H2O to produce H2SO4 and HI with a SO2 feed rate to the reactor of 50 kg/hour. Based on this value, an assumed reactor efficiency of 33%, and kinetic data from the literature, a plug flow reactor approximately 1%E2%80%9D diameter and and 12 inches long would be needed to meet the specification of the project. Because the Bunsen reaction is exothermic, heat in the amount of approximately 128,000 kJ/hr would need to be removed using a cooling jacket placed around the tubular reactor. The available literature information on Bunsen reactor design and operation, certain support equipment needed for process operation and a design that meet the specification of Matt Channon Consulting are presented.

  20. Occupational health physics at a fusion reactor

    International Nuclear Information System (INIS)

    Shank, K.E.; Easterly, C.E.; Shoup, R.L.

    1975-01-01

    Future generation of electrical power using controlled thermonuclear reactors will involve both traditional and new concerns for health protection. A review of the problems associated with exposures to tritium and magnetic fields is presented with emphasis on the occupational worker. The radiological aspects of tritium, inventories and loss rates of tritium for fusion reactors, and protection of the occupational worker are discussed. Magnetic fields in which workers may be exposed routinely and possible biological effects are also discussed

  1. Dynamic behaviour of a CAREM type reactor

    International Nuclear Information System (INIS)

    Abbate, P.; Doval, A.

    1990-01-01

    As complement to CAREM reactor design studies, behaviour analysis were made in a non-stationary regime, with the aim of developing plant systems and determining process variables variation ranges, characteristic of normal operating conditions, specifying alarm values for different variables, as well as for operating policies. Transient accidental scenes analysis were made, concluding that reactor characteristics provide security, maintaining the core integrity. (Author) [es

  2. Choice of thermal reactor systems: a report

    Energy Technology Data Exchange (ETDEWEB)

    1977-09-01

    This is a report by the UK National Nuclear Corporation published by the UK Secretary of State for Energy (Mr. Benn) on 29th July 1977. It is concerned with the advantages and disadvantages of three thermal reactor systems -the AGR (advanced gas cooled reactor), the PWR (pressurised water reactor), and the SGHWR (steam generating heavy water reactor). The object was to help in the future choice of a thermal system for the UK to cover the next 25 years. The matter of export potential is also considered. A programme of four stations of 1100 to 1300 MW each over six years starting from 1979 was assumed. It is emphasised that a decision must be taken now both about reactor systems and actual orders. Headings are as follows: Extract from conclusions reached; Summary of main features of assessment; General conclusions regarding the following - safety, security of the investment, operational characteristics, development and launching requirements, effect on industry, and capital and generation costs. It is stated that in order to make an overall judgement on reactor choice the technical, commercial and social issues involved must be weighed in conjunction with cost differentials.

  3. Environment-induced self-assembly in phase separated block copolymer systems: A SANS investigation

    International Nuclear Information System (INIS)

    Dutta, Naba K.; Thompson, Sandra; Roy Choudhury, Namita; Knott, Robert

    2006-01-01

    In this research, we examine the effect of non-selective solvent on the large-scale mesoscopic ordering in asymmetric block copolymers, poly(styrene-block-ethylene/butylene-block-styrene) (SEBS) using small angle neutron scattering technique (SANS). SANS measurements were carried out over a wide range of concentrations and temperatures. Evolution of the self-assembled phase morphology in such polymer with the thermodynamic selectivity of solvent, temperature and concentration has been discussed. Correlation between morphology and thermorheological behavior of the gels has also been established

  4. State space modeling of reactor core in a pressurized water reactor

    Energy Technology Data Exchange (ETDEWEB)

    Ashaari, A.; Ahmad, T.; M, Wan Munirah W. [Department of Mathematical Science, Faculty of Science, Universiti Teknologi Malaysia, 81310 Skudai, Johor (Malaysia); Shamsuddin, Mustaffa [Institute of Ibnu Sina, Universiti Teknologi Malaysia, 81310 Skudai, Johor (Malaysia); Abdullah, M. Adib [Swinburne University of Technology, Faculty of Engineering, Computing and Science, Jalan Simpang Tiga, 93350 Kuching, Sarawak (Malaysia)

    2014-07-10

    The power control system of a nuclear reactor is the key system that ensures a safe operation for a nuclear power plant. However, a mathematical model of a nuclear power plant is in the form of nonlinear process and time dependent that give very hard to be described. One of the important components of a Pressurized Water Reactor is the Reactor core. The aim of this study is to analyze the performance of power produced from a reactor core using temperature of the moderator as an input. Mathematical representation of the state space model of the reactor core control system is presented and analyzed in this paper. The data and parameters are taken from a real time VVER-type Pressurized Water Reactor and will be verified using Matlab and Simulink. Based on the simulation conducted, the results show that the temperature of the moderator plays an important role in determining the power of reactor core.

  5. The Pisa pre-main sequence tracks and isochrones. A database covering a wide range of Z, Y, mass, and age values

    Science.gov (United States)

    Tognelli, E.; Prada Moroni, P. G.; Degl'Innocenti, S.

    2011-09-01

    Context. In recent years new observations of pre-main sequence stars (pre-MS) with Z ≤ Z⊙ have been made available. To take full advantage of the continuously growing amount of data of pre-MS stars in different environments, we need to develop updated pre-MS models for a wide range of metallicity to assign reliable ages and masses to the observed stars. Aims: We present updated evolutionary pre-MS models and isochrones for a fine grid of mass, age, metallicity, and helium values. Methods: We use a standard and well-tested stellar evolutionary code (i.e. FRANEC), that adopts outer boundary conditions from detailed and realistic atmosphere models. In this code, we incorporate additional improvements to the physical inputs related to the equation of state and the low temperature radiative opacities essential to computing low-mass stellar models. Results: We make available via internet a large database of pre-MS tracks and isochrones for a wide range of chemical compositions (Z = 0.0002-0.03), masses (M = 0.2-7.0 M⊙), and ages (1-100 Myr) for a solar-calibrated mixing length parameter α (i.e. 1.68). For each chemical composition, additional models were computed with two different mixing length values, namely α = 1.2 and 1.9. Moreover, for Z ≥ 0.008, we also provided models with two different initial deuterium abundances. The characteristics of the models have been discussed in detail and compared with other work in the literature. The main uncertainties affecting theoretical predictions have been critically discussed. Comparisons with selected data indicate that there is close agreement between theory and observation. Tracks and isochrones are available on the web at the http://astro.df.unipi.it/stellar-models/Tracks and isochrones are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/533/A109

  6. Prevalencia de tabaquismo y grado de adicción a la nicotina en adolescentes de una escuela preuniversitaria urbana de Morelia Prevalence of smoking and degree of nicotine addiction in adolescents of an urban preuniversity institute in Morelia

    Directory of Open Access Journals (Sweden)

    Leopoldo Luque Herrera

    2008-12-01

    Full Text Available INTRODUCCIÓN. La magnitud del daño inducido por el tabaquismo está relacionada con el grado de adicción a la nicotina y frecuentemente esta adicción tiene sus inicios en la adolescencia. Este trabajo se realizó con el objetivo de estimar la prevalencia de tabaquismo y grado de adicción a la nicotina en adolescentes de una escuela urbana en México. MÉTODOS. Se estudiaron 314 adolescentes entre los 14 y 19 años, los cuales se entrevistaron con el auxilio de la Encuesta Nacional de Adicciones 2004 y el cuestionario Flagestrom; la primera para evaluar prevalencia de tabaquismo y la segunda, la dependencia a la nicotina. RESULTADOS. El grado de adicción a la nicotina fue leve en el 30 % de los adolescentes (94/314, moderado en el 2,9 % (9/314 y grave en un 0,03 % (1/314. Por otro lado, la prevalencia de tabaquismo fue del 33,1 % (104/314. Más de la mitad de los adolescentes encuestados fumaron alguna vez en su vida y el 88 % de los que fumaban comenzó a hacerlo antes de los 16 años de edad. CONCLUSIONES. La prevalencia de tabaquismo entre los adolescentes constituye un problema regional que sugiere la evaluación de las acciones de promoción de salud vigentes encaminadas a disminuir el consumo de cigarrillos y la expansión de esta y otras iniciativas de promoción de salud a sitios donde convivan adolescentes.INTRODUCTION. The magnitude of the damage induced by smoking is related to the degree of nicotine addiction. This addiction frequently starts in adolescence. This paper was aimed at estimating the prevalence of smoking and the degree of nicotine addiction in adolescents from an urban school in Mexico. METHODS. 314 adolescents aged 14-19 were interviewed with the assistance of the National School of Addictions 2004 and the Flagestrom questionnaire. The first was used to evaluate the prevalence of smoking and the second to determine nicotine dependence. RESULTS. The negree of nicotine addiction was mild in 30 % of the adolescents

  7. Las Matematicas: Lenguaje Universal. Grados Intermedios, Nivel 6a: Suma de Fracciones (Mathematics: A Universal Language. Intermediate Grades, Level 6a: Addition of Fractions).

    Science.gov (United States)

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

    This is one of a series of student booklets designed for use in a bilingual mathematics program in grades 6-8. The general format is to present each page in both Spanish and English. The mathematical topics in this booklet include addition of fractions and mixed numbers. (MK)

  8. Las Matematicas: Lenguaje Universal. Grados Intermedios, Nivel 5a: Geometria - Conjuntos de Puntos (Mathematics: A Universal Language. Intermediate Grades, Level 5a: Geometry - Sets of Points).

    Science.gov (United States)

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

    This is one of a series of student booklets designed for use in a bilingual mathematics program in grades 6-8. The general format is to present each page in both Spanish and English. The mathematical topics in the booklet include points, lines, planes, space, angles, and intersection and union of sets. (MK)

  9. Las Matematicas: Lenguaje Universal. Grados Intermedios, Nivel 4a: Multiplicacion de Fracciones (Mathematics: A Universal Language. Intermediate Grades, Level 4a: Multiplication of Fractions).

    Science.gov (United States)

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

    This is one of a series of student booklets designed for use in a bilingual mathematics program in grades 6-8. The general format is to present each page in both Spanish and English. The mathematical topics in this booklet include equivalent fractions, mixed numbers, and multiplication of fractions and mixed numbers. (MK)

  10. Os instrumentos de regulação baseados no conhecimento: o caso do programme for international student assessment (PISA Knowledge-based regulation tools (KRT: the programme for international student assessment (PISA case

    Directory of Open Access Journals (Sweden)

    Estela Costa

    2009-12-01

    Full Text Available Este artigo inscreve-se na temática dos novos modos de regulação da educação, em particular nos instrumentos de políticas públicas. No quadro da instrumentação da acção pública, a atenção recai nos instrumentos de regulação baseados no conhecimento (Knowledge-based Regulation Tools [KRT]. Na verdade, a economia mundial fundamenta-se, cada vez mais, no conhecimento, o qual emerge como instrumento de política, regulando os actores sociais e legitimando a decisão política. O Programme for International Student Assessment (PISA, da Organização para Cooperação e Desenvolvimento Económico (OCDE, foi o instrumento escolhido como passível de configurar um KRT. O texto baseiase em seis estudos de caso, assentes em entrevistas e análise documental. Intentando na circulação e no uso do PISA, na Bélgica, Escócia, França, Hungria, Portugal e Roménia, procuramos demonstrar que o PISA se afirma como um KRT, provando a relação circular entre conhecimento e política, dado que, como instrumento de política, produz conhecimento e, como instrumento científico, produz política.This text focuses on the study of a KRT (Knowledgebased Regulation Tool, within the wider framework of the new modes of regulation in education, and use of instruments in public action. The world economy is gradually more knowledge-based. Knowledge emerges as a tool for policy-making and for regulating social actors, and legitimating the political decision-making. We choose the OECD's Program for International Student Assessment (PISA as an example of a KRT. The article is based on six case-studies, with interviews and document analysis. Our goal was to study the circulation and use of PISA, in Belgium, Scotland, France, Hungary, Portugal and Romania, trying to show that PISA is indeed a KRT, thus proving the circular relationship between knowledge and policy, because as a policy instrument it produces knowledge, and as a scientific tool it produces policy.

  11. Como güelfos y gibelinos: los colegios de San Bernardo y San Antonio Abad en el Cuzco durante el siglo XVII

    Directory of Open Access Journals (Sweden)

    Guibovich Pérez, Pedro M

    2006-04-01

    Full Text Available This article deals with the conflicts that involved the San Bernardo and San Antonio schools all along the seventeenth century. The author proposes a new approach to explain the social history of colonial Cuzco. He mantains that the root of the confrontation has to do with the privileges that enjoy the jesuits in the provision of academical degrees, a basic requirement to obtain appointments in the civil and eclesiastical administration. To understand this social dinamic, he reconstructs the institutional history of both schools, and reveals the interests that defend the main actors of this secular conflict.

    Los conflictos que enfrentaron a los colegios de San Bernardo y San Antonio Abad a lo largo del siglo XVII es el tema central de estudio de este ensayo. El autor propone una nueva lectura a este episodio de la historia social del Cuzco colonial. Sostiene que en la raíz de los enfrentamientos estuvo el privilegio que gozaban los jesuitas para la concesión de grados académicos, requisitos fundamentales para obtener cargos en la administración civil y eclesiástica. Para entender la dinámica social, el autor reconstruye la historia institucional de los colegios y los intereses en juego de los principales protagonistas del secular conflicto.

  12. A Preliminary Analysis of Reactor Performance Test (LOEP) for a Research Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Hyeonil; Park, Su-Ki [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2015-10-15

    The final phase of commissioning is reactor performance test, which is to prove the integrated performance and safety of the research reactor at full power with fuel loaded such as neutron power calibration, Control Absorber Rod/Second Shutdown Rod drop time, InC function test, Criticality, Rod worth, Core heat removal with natural mechanism, and so forth. The last test will be safety-related one to assure the result of the safety analysis of the research reactor is marginal enough to be sure about the nuclear safety by showing the reactor satisfies the acceptance criteria of the safety functions such as for reactivity control, maintenance of auxiliaries, reactor pool water inventory control, core heat removal, and confinement isolation. After all, the fuel integrity will be ensured by verifying there is no meaningful change in the radiation levels. To confirm the performance of safety equipment, loss of normal electric power (LOEP), possibly categorized as Anticipated Operational Occurrence (AOO), is selected as a key experiment to figure out how safe the research reactor is before turning over the research reactor to the owner. This paper presents a preliminary analysis of the reactor performance test (LOEP) for a research reactor. The results showed how different the transient between conservative estimate and best estimate will look. Preliminary analyses have shown all probable thermal-hydraulic transient behavior of importance as to opening of flap valve, minimum critical heat flux ratio, the change of flow direction, and important values of thermal-hydraulic parameters.

  13. A Welfare Reform--Homelessness--Foster Care Connection? The Story of "Lag Families" and "Limbo Children" in San Diego.

    Science.gov (United States)

    Institute for Children and Poverty, New York, NY.

    An analysis of data from a survey of more than 100 parents residing in emergency shelter in San Diego, California, reveals a portrait of poverty that is prevalent among women and children in the United States today. Homeless families in San Diego, as in the rest of the country, are most often headed by women in their early thirties whose prospects…

  14. Motivación, necesidades y expectativas de los estudiantes del Grado en Enfermería en el aprendizaje del inglés como segunda lengua Motivation, needs and expectations of nursing degree students towards English language learning

    Directory of Open Access Journals (Sweden)

    Rafaela Camacho Bejarano

    2012-12-01

    Full Text Available Los nuevos estudios de Grado, Máster y Doctorado consideran que el manejo de la lengua inglesa es una competencia transversal fundamental. Este trabajo tiene como objetivo conocer la motivación, necesidades y expectativas del alumnado del Grado en Enfermería de la Universidad de Huelva en el aprendizaje del inglés como segunda lengua. Se ha realizado un estudio observacional descriptivo de corte transversal. El alumnado otorga una gran importancia a la formación en inglés para su futuro desempeño con diferencias significativas en cuanto a su aplicabilidad en los diferentes ámbitos profesionales. A pesar de su alta motivación, un alto porcentaje considera que la oferta académica universitaria no cubre sus necesidades formativas. Se cuestiona por tanto la necesidad de ampliar y reorientar la formación de manera que se cumplan las expectativas del alumnado, las demandas profesionales y conseguir potenciar el aprendizaje de otras lenguas como vehículo de desarrollo académico y profesional.The new Degree, Master and Doctorate studies considers English language use as an essential competency. This paper aims to get a better knowledge of first and second year students Nursing Degree students within the University of Huelva in terms of motivation, needs and expectations regarding learning English as second language. An observational descriptive study from a cross-sectional approach has been performed. Students consider highly important English language learning for their future professional development while showing important significant differences about its applicability on the different professional settings. Despite their high motivation, a high percentage consider than the academic catalogue do not cover their learning needs. These results justify the need for further research and for a potential reorientation of the English language educative programs to match students' expectations, their professional needs and to enhance other

  15. Alternativa Pedagógica dirigida a la integración de las habilidades para el juego de Baloncesto en los alumnos de 6to. grado de la Escuela Titán de Bronce del municipio de Guane

    Directory of Open Access Journals (Sweden)

    Bárbara Aleida Lam Peralta

    2009-03-01

    Full Text Available La investigación realizada se mueve en el campo de las habilidades para el juego de Baloncesto, y tiene como objetivo elaborar una alternativa pedagógica dirigida a la integración de las habilidades para el juego de  Baloncesto en los alumnos de 6to. grado de la escuela Titán de Bronce, del municipio Guane. Para este trabajo además de los alumnos de 6to grado que constituyeron la población del mismo, nos auxiliamos de  un grupo muestral constituido por profesores y metodólogos que nos brindaron datos precisos y valiosos para obtener los resultados que nos propusimos una vez elaborado el problema de la investigación. Se utilizaron varios instrumentos tales como: entrevistas, encuestas y observación a las clases de Educación Física, y nos apoyamos en los métodos empíricos, teóricos y complementarios, para de esa manera organizar    y llevar a cabo satisfactoriamente a  propuesta pedagógica encaminada a facilitar la enseñanza del deporte de Baloncesto, y por ende que los niños se sientan más motivados y con deseos de aprender jugando. En los programas de Educación Física de la enseñanza primaria se tiende a priorizar la habilidad aislada, para posteriormente integrarlas en un juego, pero  teniendo  en  cuenta  que en  cada  período  se  trabaja  con  deportes diferentes, no es mucho el tiempo disponible para que el alumno aprenda a jugar de acuerdo a lo dispuesto en las  orientaciones metodológicas, por lo que con esta alternativa pedagógica que fue aplicada se obtuvieron los resultados esperados desde un principio, o sea, comenzar a jugar desde la primera clase e ir trabajando con las habilidades técnicas en la marcha de los propios juegos, y lo mas importante de la alternativa es que después de aplicada la propuesta de actividades un gran por ciento de los niños fueron capaces de integrar cada una de las habilidades del Baloncesto.

  16. A next-generation reactor concept: The Integral Fast Reactor (IFR)

    International Nuclear Information System (INIS)

    Chang, Y.I.

    1992-01-01

    The Integral Fast Reactor (IFR) is an advanced liquid metal reactor concept being developed at Argonne National Laboratory as reactor technology for the 21st century. It seeks to specifically exploit the inherent properties of liquid metal cooling and metallic fuel in a way that leads to substantial improvements in the characteristics of the complete reactor system, in particular passive safety and waste management. The IFR concept consists of four technical features: (1) liquid sodium cooling, (2) pool-type reactor configuration, (3) metallic fuel, and (4) fuel cycle closure based on pyroprocessing

  17. A next-generation reactor concept: The Integral Fast Reactor (IFR)

    Energy Technology Data Exchange (ETDEWEB)

    Chang, Y.I.

    1992-01-01

    The Integral Fast Reactor (IFR) is an advanced liquid metal reactor concept being developed at Argonne National Laboratory as reactor technology for the 21st century. It seeks to specifically exploit the inherent properties of liquid metal cooling and metallic fuel in a way that leads to substantial improvements in the characteristics of the complete reactor system, in particular passive safety and waste management. The IFR concept consists of four technical features: (1) liquid sodium cooling, (2) pool-type reactor configuration, (3) metallic fuel, and (4) fuel cycle closure based on pyroprocessing.

  18. A next-generation reactor concept: The Integral Fast Reactor (IFR)

    Energy Technology Data Exchange (ETDEWEB)

    Chang, Y.I.

    1992-07-01

    The Integral Fast Reactor (IFR) is an advanced liquid metal reactor concept being developed at Argonne National Laboratory as reactor technology for the 21st century. It seeks to specifically exploit the inherent properties of liquid metal cooling and metallic fuel in a way that leads to substantial improvements in the characteristics of the complete reactor system, in particular passive safety and waste management. The IFR concept consists of four technical features: (1) liquid sodium cooling, (2) pool-type reactor configuration, (3) metallic fuel, and (4) fuel cycle closure based on pyroprocessing.

  19. Estudio y análisis de la calidad de la educación secundaria en España desde una perspectiva geomática con herramientas de cartografía y SIG.

    OpenAIRE

    Aragón Velasco, Aurelio

    2015-01-01

    En el presente Trabajo Fin de Grado se realiza un estudio y análisis geomático de la calidad de la educación secundaria mediante procedimientos de Cartografía y SIG, con datos espaciales y temáticos de fuentes oficiales que garantizan la precisión y certeza necesaria para la obtención de unas conclusiones objetivas y de calidad. Dicha calidad de la educación secundaria será estudiada bajo el marco de referencia de los estudios dek informe PISA (por sus siglas en inglés: Programme for Inter...

  20. Conocimientos sobre sexualidad y prácticas sexuales en adolescentes de 8 a 11 grado en una institución educativa de la ciudad de Manizales (Colombia, 2013

    Directory of Open Access Journals (Sweden)

    José Jaime Castaño Castrillón

    2014-01-01

    Full Text Available Objetivo: Identificar los conocimientos y prácticas sexuales en la población de adolescentes de los grados 8 a 11 de una institución educativa de la ciudad de Manizales (Caldas, Colombia. Materiales y métodos: Estudio de corte transversal; la población estuvo conformada por 170 adolescentes de 14 a 21 años, matriculados en los grados 8 a 11 de Básica Secundaria de una institución educativa de la ciudad de Manizales, de estratos medio y bajo. Se realizó por el método de encuesta. Se tomaron diferentes variables sobre conocimientos sexuales, prácticas sexuales y factores de riesgo para embarazo y enfermedades de transmisión sexual. Resultados: El promedio de edad fue de 16,31 años, de género masculino en un 56,5 %. Presentaron un promedio de 2,9 (sobre 5 de conocimientos en educación sexual, 1,8 en métodos anticonceptivos, 2,4 en embarazo, 3,5 en enfermedades de transmisión sexual, para un promedio total de 2,7. El 91,8 % ha tenido experiencias sexuales, 70,1 % con penetración; 46,6 % no emplea métodos anticonceptivos; 5 % de las mujeres manifestó que había tenido embarazos; 4,2 % dijo que no ha tenido enfermedades de transmisión sexual. El bajo puntaje de conocimientos correlaciona significativamente con incomodidad en el empleo de métodos anticonceptivos (p=0.018, desconocimiento de para qué se emplean (p=0.019, no empleo de ellos (p=0,007. Conclusiones: Debido al bajo conocimiento en temas de sexualidad y la intensa práctica sexual, esta población se convierte en población de alta riesgo para presencia de embarazos no deseados, de abortos inducidos y de enfermedades de transmisión sexual.

  1. Yi-gan san restores behavioral alterations and a decrease of brain glutathione level in a mouse model of schizophrenia.

    Science.gov (United States)

    Makinodan, Manabu; Yamauchi, Takahira; Tatsumi, Kouko; Okuda, Hiroaki; Noriyama, Yoshinobu; Sadamatsu, Miyuki; Kishimoto, Toshifumi; Wanaka, Akio

    2009-01-01

    The traditional Chinese herbal medicine yi-gan san has been used to cure neuropsychological disorders. Schizophrenia can be one of the target diseases of yi-gan san. We aimed at evaluating the possible use of yi-gan san in improving the schizophrenic symptoms of an animal model. Yi-gan san or distilled water was administered to mice born from pregnant mice injected with polyinosinic-polycytidilic acid or phosphate buffered saline. The former is a model of schizophrenia based on the epidemiological data that maternal infection leads to psychotic disorders including schizophrenia in the offspring. Prepulse inhibition and sensitivity to methamphetamine in open field tests were analyzed and the total glutathione content of whole brains was measured. Yi-gan san reversed the decrease in prepulse inhibition, hypersensitivity to methamphetamine and cognitive deficits found in the model mice to the level of control mice. Total glutathione content in whole brains was reduced in the model mice but was restored to normal levels by yi-gan san treatment. These results suggest that yi-gan san may have ameliorating effects on the pathological symptoms of schizophrenia.

  2. Yi-Gan San Restores Behavioral Alterations and a Decrease of Brain Glutathione Level in a Mouse Model of Schizophrenia

    Directory of Open Access Journals (Sweden)

    Manabu Makinodan M.D.

    2009-01-01

    Full Text Available The traditional Chinese herbal medicine yi-gan san has been used to cure neuropsychological disorders. Schizophrenia can be one of the target diseases of yi-gan san. We aimed at evaluating the possible use of yi-gan san in improving the schizophrenic symptoms of an animal model. Yi-gan san or distilled water was administered to mice born from pregnant mice injected with polyinosinic-polycytidilic acid or phosphate buffered saline. The former is a model of schizophrenia based on the epidemiological data that maternal infection leads to psychotic disorders including schizophrenia in the offspring. Prepulse inhibition and sensitivity to methamphetamine in open field tests were analyzed and the total glutathione content of whole brains was measured. Yi-gan san reversed the decrease in prepulse inhibition, hypersensitivity to methamphetamine and cognitive deficits found in the model mice to the level of control mice. Total glutathione content in whole brains was reduced in the model mice but was restored to normal levels by yi-gan san treatment. These results suggest that yi-gan san may have ameliorating effects on the pathological symptoms of schizophrenia.

  3. ESTADO FITOSANITARIO DE UNA POBLACION DE ZINGIBERALES. VEREDA SAN PEDRITO- MUNICIPIO DE TIMBIO - CAUCA

    Directory of Open Access Journals (Sweden)

    SANDRA CARLINA RIVAS Z

    2013-12-01

    Full Text Available En la vereda San Pedrito, Municipio de Timbío, departamento del Cauca, se observó el estado fitosanitario con respecto a enfermedades fúngicas presentes en 12 especies y 3 variedades de zingiberales. Después de observar en campo las sintomatologías, se tomaron muestras del material vegetal y se cultivaron en el laboratorio, donde se logró identificar enfermedades ocasionadas principalmente por los hongos Fusarium oxysporum, Colletotrichum sp., Alternaria sp., Dipliodia sp., Pestalotia sp., Mycosphaerella musicola, Cordana musicola, Sclerotinia sp., Helminthosporium sp., Nigrospora sp., Cercospora sp., Monilia sp., Rhizoctonia sp.; también se desarrollaron diagramas estándares de severidad para evaluar el ataque causando por los patógenos, determinando el área de las hojas e inflorescencias en cm2 y severidades del 1%, 5%, 10%, 25% y 50%, que corresponden a los grados 1, 3, 5, 7 y 9; encontrando que los hongos fitopatógenos que presentaron mayor severidad (grado 9 fueron Alternaria sp. y Nigrospora sp., en la variedad H. griggsiana y la severidad más baja (grado 5 fue ocasionada por Fusarium oxysporum, afectando tanto las inflorescencias como el follaje en las variedades Strelitzia reginae y Etlingera.

  4. Daddy, What's a Nuclear Reactor?

    International Nuclear Information System (INIS)

    Reisenweaver, Dennis W.

    2008-01-01

    No matter what we think of the nuclear industry, it is part of mankind's heritage. The decommissioning process is slowly making facilities associated with this industry disappear and not enough is being done to preserve the information for future generations. This paper provides some food for thought and provides a possible way forward. Industrial archaeology is an ever expanding branch of archaeology that is dedicated to preserving, interpreting and documenting our industrial past and heritage. Normally it begins with analyzing an old building or ruins and trying to determine what was done, how it was done and what changes might have occurred during its operation. We have a unique opportunity to document all of these issues and provide them before the nuclear facility disappears. Entombment is an acceptable decommissioning strategy; however we would have to change our concept of entombment. It is proposed that a number of nuclear facilities be entombed or preserved for future generations to appreciate. This would include a number of different types of facilities such as different types of nuclear power and research reactors, a reprocessing plant, part of an enrichment plant and a fuel manufacturing plant. One of the main issues that would require resolution would be that of maintaining information of the location of the buried facility and the information about its operation and structure, and passing this information on to future generations. This can be done, but a system would have to be established prior to burial of the facility so that no information would be lost. In general, our current set of requirements and laws may need to be re-examined and modified to take into account these new situations. As an alternative, and to compliment the above proposal, it is recommended that a study and documentation of the nuclear industry be considered as part of twentieth century industrial archaeology. This study should not only include the power and fuel cycle

  5. The new 'Angeli di San Giuliano' School: a significant example of seismic isolation

    International Nuclear Information System (INIS)

    Clemente, P.; Buffarini, G.; Dolce, M.; Parducci, A.

    2009-01-01

    The new school in San Giuliano di Puglia has been built with a seismic base isolation system ensuring a safety degree that otherwise could not be obtained with traditional techniques. Due to its complex and irregular shape, the building also gives rise to some considerations about the design in seismic areas. [it

  6. PRELIMINARY GEOID MODEL IN SAN JUAN PROVINCE: A CASE STUDY IN THE ANDES

    DEFF Research Database (Denmark)

    Tocho, Claudia; Miranda, Silvia; Pacino, Maria Cristina

    2008-01-01

    A high-resolution and high-precision detailed gravimetric geoid has been computed for San Juan province in Argentina, ranging from 27 degrees S to 34 degrees S in latitude and 72 degrees W to 65 degrees W in longitude. The gravimetric geoid was calculated using the RTM method, a multiband spheric...

  7. PISA Y LA EVALUACIÓN. ESPEJO O ALIMENTO —NOTAS AL MARGEN—

    Directory of Open Access Journals (Sweden)

    Ramiro Fernández Mayo

    2010-05-01

    Full Text Available From the 23rd to the 26th of November, it took place in La Palma the International Symposium PISA under Examination -a change in knowledge, a change in tests and a change in schools-. The author, who took part in the symposium, describes and extracts conclusions from the long and fruitful talks among the most credited specialists who came from all over the world and attended the symposium by courtesy of CESE -Comparative Education Society in Europe- and its Chairman, Mr Miguel A. Pereyra, a La Palma native-born citizen.

  8. Una lectura cuantitativa de los documentos de competencias de los nuevos grados de Derecho

    OpenAIRE

    Leví Orta, Genoveva; Ramos Méndez, Eduardo

    2014-01-01

    Los documentos de formulación de competencias de los grados constituyen una fuente valiosa para el análisis, valoración y comparación del perfil de formación que ofrecen actualmente las diferentes titulaciones. Este trabajo tiene como objetivo realizar una lectura cuantitativa, basada en las ideas del Análisis de Contenido, de los documentos de competencias del grado de Derecho de distintas universidades españolas. La metodología empleada tiene dos fases. En primer lugar, se identifica en el ...

  9. A review of the UK fast reactor programme

    International Nuclear Information System (INIS)

    Smith, R.D.

    1982-01-01

    A review of the United Kingdom Fast Reactor Programme is introduced. Operational experience with the Prototype Fast Reactor (PFR) is briefly summarized. The design concept of the Commercial Demonstration Fast Reactor (CDFR) is given in some detail. The emphasis is on materials development, chemical engineering/sodium technology, fuel reprocessing and fuel cycle, engineering component development and reactor safety

  10. Evaluation of Pressure Changes in HANARO Reactor Hall after a Reactor Shutdown

    International Nuclear Information System (INIS)

    Han, Geeyang; Han, Jaesam; Ahn, Gukhoon; Jung, Hoansung

    2013-01-01

    The major objective of this work is intended to evaluate the characteristics of the thermal behavior regarding how the decay heat will be affected by the reactor hall pressure change and the increase of pool water temperature induced in the primary coolant after a reactor shutdown. The particular reactor pool water temperature at the surface where it is evaporated owing to the decay heat resulting in the local heat transfer rate is related to the pressure change response in the reactor hall associated with the primary cooling system because of the reduction of the heat exchanger to remove the heat. The increase in the pool water temperature is proportional to the heat transfer rate in the reactor pool. Consequently, any limit on the reactor pool water temperature imposes a corresponding limit on the reactor hall pressure. At HANARO, the decay heat after a reactor shutdown is mainly removed by the natural circulation cooling in the reactor pool. This paper is written for the safety feature of the pressure change related leakage rate from the reactor hall. The calculation results show that the increase of pressure in the reactor hall will not cause any serious problems to the safety limits although the reactor hall pressure is slightly increased. Therefore, it was concluded that the pool water temperature increase is not so rapid as to cause the pressure to vary significantly in the reactor hall. Furthermore, the mathematical model developed in this work can be a useful analytical tool for scoping and parametric studies in the area of thermal transient analysis, with its proper representation of the interaction between the temperature and pressure in the reactor hall

  11. Mesquite: A multi-purpose species in two locations of San Luis Potosi, Mexico

    Science.gov (United States)

    Jose Villanueva-Diaz; Augustin Hernandez-Reyna; J. Armando Ramirez-Garcia

    2000-01-01

    The mesquite woodland distributed in approximately 200,000 ha in Llanos de Angostura, and Pozo del Carmen, San Luis Potosi, represents a main source of firewood, construction material, honey, and forage for the rural people that inhabit part of the lowlands of the hydrological region RH26 and RH37. Firewood collection in this region averages 142 m3 /week. Most of this...

  12. Evaluating the sustainability of a regional system using Fisher information in the San Luis Basin, Colorado

    Science.gov (United States)

    This paper describes the theory, data, and methodology necessary for using Fisher information to assess the sustainability of the San Luis Basin (SLB) regional system over time. Fisher information was originally developed as a measure of the information content in data and is an ...

  13. Power conditioning system for a nuclear reactor

    International Nuclear Information System (INIS)

    Higashigawa, Yuichi; Joge, Toshio.

    1981-01-01

    Purpose: To provide a power conditioning system for a BWR type reactor which has a function to be automatically operated within a range that the relationship between the heat power of the reactor and the electric power of an electric generator does not lose the safety of fuel by eliminating the unnecessary fluctuation of the power of the reactor. Constitution: A load request error signal fed from a conventional turbine control system to recirculation flow regulator is eliminated, and a reactor power conditioning system is newly provided, to which an electric generator power signal, a reactor average power area monitor signal and a load request signal are inputted. Thus, the load request signal is compared directly with the electric power of the electric generator, the recirculation flow rate is controlled by the compared result, and whether the correlation between the heat power of the reqctor and the electric power of the generator satisfies the correlation determined to prove the safety of fuel or not is checked. If this correlation is satisfied, the recirculation flow rate is merely automatically controlled. (Yoshino, Y.)

  14. Research on the behaviour of pressure suppression containment systems carried out at the University of Pisa

    International Nuclear Information System (INIS)

    Bigi, R.; Bovalini, R.; Mazzini, M.; Micheletti, E.

    1978-01-01

    A research programme has been carried out at the University of Pisa to study the thermo-hydraulic transient in pressure suppression containment systems during a LOCA. In the first series of experimental tests remarkable oscillations of pressure were observed both in dry and in wet-well. In order to describe these dynamic phenomena, a mathematical model has been set up; the main out-lines of this model are briefly described and the comparison between the calculated and experimental results is reported. (author)

  15. A simulation of the Upper San Fernando dam using a synthesized approach

    International Nuclear Information System (INIS)

    Beaty, M.H.; Byrne, P.M.

    1999-01-01

    A mechanics-based approach to assessing post-liquefaction displacements in slopes is discussed. The approach, which involves approximation of soil behaviour by using numerical models, is derived from total stress procedures and is said to have two major advantages: (1) it combines the triggering and post-liquefaction response into one analysis, and (2) it improves the modeling of post-liquefaction element behaviour. Application of the approach is demonstrated through the simulation of the response of the Upper San Fernando dam to the 1971 San Fernando earthquake. Results were compared to the Bartlett and Youd empirical procedure and were found to agree with expectations reasonably well. Viscous damping, blowcount, and residual strength in simple shear were found to be the key variables. Some questions still remain to be answered regarding some of the input parameters, particularly the viscous damping coefficients. Research to further elucidate the mechanism is continuing. 21 refs., 19 figs

  16. INR TRIGA Research Reactors: A Neutron Source for Radioisotopes and Materials Investigation

    International Nuclear Information System (INIS)

    Barbos, D.; Ciocanescu, M.; Paunoiu, C.; Bucsa, A.F.

    2013-01-01

    At the INR there are 2 high intensity neutron sources. These sources are in fact the two nuclear TRIGA reactors: TRIGA SSR 14 MW and TRIGA ACPR. TRIGA stationary reactor is provided with several in-core irradiation channels. Other several out-of-core irradiation channels are located in the vertical channels in the beryllium reflector blocks. The maximum value of the thermal neutron flux (E 14 cm -2 s -1 and of fast neutron flux (E>1 MeV) is 6.89×10 13 cm -2 s -1 . For neutron activation analysis both reactors are used and k0-NAA method has been implemented. At INR Pitesti a prompt gamma ray neutron activation analysis devices has been designed, manufactured ant put into operation. For nuclear materials properties investigation neutron radiography methods was developed in INR. For these purposes two neutron radiography devices were manufacture, one of them underwater and other one dry. The neutron beams are used for investigation of materials properties and components produced or under development for applications in the energy sector (fission and fusion). At TRIGA 14 MW reactor a neutron difractormeter and a SANS devices are available for material residual stress and texture measurements. TRIGA 14 MW reactor is used for medical and industrial radioisotopes production ( 131 I, 125 I, 192 Ir, etc) and a method for 99 Mo- 99 Tc production from fission is under developing. At INR Pitesti several special programmes for new types of nuclear fuel behavior characterization are under development. (author)

  17. Humidity control device in a reactor container

    International Nuclear Information System (INIS)

    Aizawa, Motohiro; Igarashi, Hiroo; Osumi, Katsumi; Kimura, Takashi.

    1986-01-01

    Purpose: To provide a device capable of maintaining the inside of a container under high humidity circumstantial conditions causing less atmospheric corrosions, in order to prevent injuries due to atmospheric corrosions to smaller diameter stainless steel pipeways in the reactor container. Constitution: Stress corrosion cracks (SCC) to the smaller diameter stainless steel pipeways are caused dependent on the relative humidity and it is effective as the countermeasure against SCC to maintain the relative humidity at a low level less than 30 % or high level greater than 60 %. Based on the above findings, a humidity control device is disposed so as to maintain the relative humidity for the atmosphere within a reactor core on a higher humidity region. The device is adapted such that recycling gas in the dry-well coolant circuit is passed through an orifice to atomize the water introduced from feedwater pipe and introduce into a reactor core or such that the recycling gases in the dry-well cooling circuit are bubbled into water to remove chlorine gas in the reactor container gas thereby increasing the humidity in the reactor container. (Kamimura, M.)

  18. Leak monitoring method for a reactor container

    International Nuclear Information System (INIS)

    Uehara, Toshio.

    1987-01-01

    Purpose: To confirm leakages from a container upon nuclear reactor operation. Method: Leakages from a nuclear reactor container has been prevented by lowering the inner pressure of the container relative to the external pressure. In the conventional method of calculating the leakage by applying an inner pressure to the container and measuring the pressure change, etc. after the elapse of a pre-determined time, the measurement has to be conducted at periodical inspection when the nuclear reactor is shut-down. In view of the above, the leak test is conducted in the present invention by applying a slight inner pressure to the inside of the reactor container by supplying gases from a gas supply system and detecting the flow rate of the gases in the gas supply system while maintaining the slight inner pressure constant by controlling the supply and discharge of the gases. By applying such a inner pressure as causing no effect to the reactor operation, it is possible to monitor the leaks during operation and to detect the flow rate value surely and continuously if the leak is resulted. (Kamimura, M.)

  19. Preliminary design of a tandem mirror reactor

    International Nuclear Information System (INIS)

    Strohmayer, J.N.

    1984-04-01

    The purpose of this thesis is to examine the TARA mirror experiment as a possible tandem mirror reactor configuration. This is a preliminary study to size the coil structure based on using the smallest end cell axial length that physics and engineering allow, zeroing the central cell parallel currents and having interchange stability. The input powers are estimated for the final reactor design so a Q value may be estimated. The Q value is defined as the fusion power divided by the total injected power absorbed by the plasma. A computer study was performed on the effect of the transition size, the transition vertical spacing and transition current. These parameters affect the central cell parallel currents, the recircularization of the flux tube and the ratio of central cell beta to anchor beta needed for marginal stability. Two designs were identified. The first uses 100 keV and 13 keV neutral beams to pump the ions that trap in the thermal barrier. The Q value of this reactor is 11.3. The second reactor uses a pump beam at 40 keV. This energy is chosen because there is a resonance for the charge exchange cross section between D 0 and He 2+ at this energy, thus the alpha ash will be pumped along with the deuterium and tritium. The Q value of this reactor is 11.6

  20. El sistema educativo de Finlandia y su ??xito en la prueba PISA

    OpenAIRE

    Gripenberg, Martin; Lizarte Sim??n, Emilio Jes??s

    2012-01-01

    Las pruebas PISA muestran una vez m??s el buen resultado referido al rendimiento escolar en Finlandia. Entre sus variadas estructuras organizativas y directivas puede discurrirse la existencia de un consenso sobre la pol??tica educativa com??n que refleja las directrices a considerar en el desarrollo del curr??culo. Los municipios tienen una gran relevancia a la hora de organizar y concretar la educaci??n b??sica adem??s de definir las intenciones en el curr??culo. Los centros y l...

  1. Power distribution monitor in a nuclear reactor

    International Nuclear Information System (INIS)

    Uematsu, Hitoshi

    1983-01-01

    Purpose: To enable accurate monitoring for the reactor power distribution within a short time in a case where abnormality occurs in in-core neutron monitors or in a case where the reactor core state changes after the calibration for the neutron monitors. Constitution: The power distribution monitor comprises a power distribution calculator adapted to be inputted counted values from a reactor core present state data instruments and calculate the neutron flux distribution in the reactor core and the power distribution based on previously incorporated physical models, an RCF calculator adapted to be inputted with the counted values from the in-core neutron monitors and the neutron flux distribution and the power distribution calculated in the power distribution calculator and compensate the counted errors included in the counted values form the in-core neutron monitors and the calculation errors included in the power distribution calculated in the power distribution calculator to thereby calculate the power distribution within the reactor core, and an input/output device for the input of the data required for said power distribution calculator and the display for the calculation result calculated in the RCF calculator. (Ikeda, J.)

  2. A tokamak reactor with servicing capability

    International Nuclear Information System (INIS)

    Mitchell, J.T.D.; Hollis, A.

    1976-01-01

    A conceptual design for a Tokamak reactor with practical facilities for the regular replacement of blanket components after the inevitable damage from neutron irradiation, and fatigue is described. This essential facility has been largely ignored in published fusion reactor designs. One exception is the inertially-confined Saturn proposal. Tokamak and other toroidal closed-line systems have very complex geometries and sub-system requirements, which result in blanket servicing being a very difficult problem. In the concept described the magnet shield is divided into two structures - an outer permanent one with access doors and an inner shield, part of and supporting the blanket inside. Servicing access is horizontally between the toroidal magnet coils, after moving some outer poloidal magnet coils. The reactor, reactor hall, workshops and remote-handling facilities are described, and the servicing requirements discussed. The important servicing operation is the remote replacement of radiation damaged blanket and shield - divided in this design into 20 sectors, each weighing 75-100 tons and 11-12 metres high. Analysis of the operation indicates that if one sector can be replaced during a single weekend - i.e. a period of low power demand - then the annual reactor-generator availability allowing as well for the general plant servicing should be >0.9. This level of availability should meet the requirements of generating authorities but the facilities, equipment and workshops necessary may be complex and expensive

  3. Ventilation air conditioner for a reactor container

    International Nuclear Information System (INIS)

    Ikegame, Noboru; Nakagawa, Takeshi.

    1980-01-01

    Purpose: To suppress the variations in the internal pressure of a reactor container and smoothly ventilate the reactor container. Constitution: The air conditioner provides an air-flow-rate-control damper, a purge-air supply fan, and a filter device in the air-supply pipe of a reactor container. Furthermore, it provides a pressure difference detector at a part of the container. The air-flow-rate-control damper is connected electrically through a position-modulator-comparison amplifier to the pressure difference detector. When the filtration becomes insufficient by clogging of the filter device and the internal pressure increased abruptly in the container, the pressure-difference detector can detect it, and the damper is operated by a pressure regulator and the comparator so as to control the air flow to the container. Thus, the internal pressure variation is controlled so as to easily ventilate the container. (J.P.N.)

  4. Comer mejor y moverse más: programa contra la obesidad y sobrepeso en alumnos del quinto y sexto grado de la escuela primaria “José María Leyva”, Hermosillo, Sonora

    Directory of Open Access Journals (Sweden)

    Brianda Cecilia Serecer Varela

    2015-06-01

    Full Text Available El aumento mundial de sobrepeso y obesidad es atribuible a factores como dieta con aumento de la ingesta de alimentos hipercalóricos y disminución de la actividad física. El objetivo fue evaluar un programa de intervención cuya meta era disminuir el IMC en niños de quinto y sexto grado en una escuela primaria de Hermosillo, Sonora. El programa se implementó de diciembre de 2013 a junio de 2014 en tres etapas: por Enfermería, Nutrición, y Cultura física y deporte, y se logró reducir el Índice de Masa Corporal de los escolares (IMC inicial 19.25, IMC final 18.71. De acuerdo a la prueba de Wilcoxon se encontraron diferencias estadísticamente significativas entre el peso inicial y final (p: 00. La implementación de programas multidisciplinarios en la atención contra la obesidad conlleva a la disminución de sobrepeso y obesidad y disminución de factores de riesgo para la salud.

  5. A compact reactor/ORC power source

    International Nuclear Information System (INIS)

    Meier, K.L.; Kirchner, W.L.; Willcutt, G.J.

    1986-01-01

    A compact power source that combines an organic Rankine cycle (ORC) electric generator with a nuclear reactor heat source is being designed and fabricated. Incorporating existing ORC technology with proven reactor technology, the compact reactor/ORC power source offers high reliability while minimizing the need for componenet development. Thermal power at 125 kWt is removed from the coated particle fueled, graphite moderated reactor by heat pipes operating at 500 0 C. Outside the reactor vessel and connected to the heat pipes are vaporizers in which the toluene ORC working fluid is heated to 370 0 C. In the turbine-alternator-pump (TAP) combined-rotating unit, the thermal energy of the toluene is converted to 25 kWe of electric power. Lumped parameter systems analyses combined with a finite element thermal analyses combined with a finite element thermal analysis have aided in the power source design. The analysis have provided assurance of reliable multiyear normal operation as well as full power operation with upset conditions, such as failed heat pipes and inoperative ORC vaporizers. Because of inherent high reliability, long life, and insensitivity to upset conditions, this power source is especially suited for use in remote, inaccessible locations where fuel delivery and maintenance costs are high

  6. Device for supporting a nuclear reactor core

    International Nuclear Information System (INIS)

    Costes, D.

    1976-01-01

    The core of a light-water reactor which is enclosed in a prestressed concrete pressure vessel and held within a diffuser basket is supported by a device consisting of a cylindrical shell which surrounds the basket and is rigidly fixed to a plurality of frusto-conical skirts having concurrent axes and located substantially at right angles to the axis of the reactor core. The small base of each skirt is rigidly fixed to the shell and the large base is anchored in openings formed in the reactor vessel for the penetration of coolant inlet and outlet pipes. The top portion of the shell is secured to the top portion of the diffuser basket, a flat surface being formed on the shell at the point of connection with each frusto-conical skirt so as to ensure rigid suspension while permitting thermal expansion

  7. Fuel assembly for a nuclear reactor

    International Nuclear Information System (INIS)

    Gjertsen, R.K.

    1982-01-01

    A fuel assembly in a nuclear reactor comprises a locking mechanism that is capable of locking the fuel assembly to the core plate of a nuclear reactor to prevent inadvertent movement of the fuel assembly. The locking mechanism comprises a ratchet mechanism 108 that allows the fuel assembly to be easily locked to the core plate but prevents unlocking except when the ratchet is disengaged. The ratchet mechanism is coupled to the locking mechanism by a rotatable guide tube for a control rod or water displacer rod. (author)

  8. Curso de Pre-Grado en Formación de Recursos Humanos en Histología y Embriología

    OpenAIRE

    Peñalva, Pablo; Ferri, David; Alonso, Marcelo Javier; Bazoalto, Daniel

    2012-01-01

    p. 123-127 La formación de ayudantes alumnos es común en la carrera de Ciencia Veterinaria. Por ello es conveniente la formación, tanto ética y como profesional, de dichos aspirantes, a partir del 1° año de la facultad. Teniendo en cuenta esta situación los miembros de la cátedra de Histología y Embriología anexaron a la actividad académica la formación de recursos humanos a través de cursos de pregrado.

  9. Trabajo Práctico: Recurso que propicia el aprendizaje significativo sobre diversidad y ecología microbiana en estudiantes de grado cuarto (4º del colegio Champagnat de Bogotá.pág. 1-18

    Directory of Open Access Journals (Sweden)

    Juan Carlos Rozo González

    2013-03-01

    Full Text Available Se implementó una propuesta dinámica e innovadora como lo es la elaboración de trabajos prácticos para la enseñanza de la microbiología en primaria con estudiantes de grado cuarto (4º del colegio Champagnat de Bogotá. Este trabajo pretende establecer las actividades como recursos que propician el aprendizaje significativo acerca de diversidad y ecología microbiana. De igual manera, se realizan con el fin de que los estudiantes reconozcan la importancia y las interacciones de los microorganismos con el ambiente. En este artículo se mostrarán diferentes actividades prácticas como la elaboración de talleres y carreras de observación, las cuales permitieron establecer categorías de análisis respecto a la interpretación que los estudiantes tienen acerca de los microorganismos, generando en ellos habilidades actitudinales, conceptuales y procedimentales, orientándolos al trabajo científico e investigativo.

  10. Conciencia fonológica y procesos léxicos de la lectura en estudiantes de inicial 5 años y 2° grado de una institución educativa de Lima Metropolitana

    Directory of Open Access Journals (Sweden)

    Jennifer I. Cannock

    2014-06-01

    Full Text Available El objetivo de la presente investigación fue establecer la relación entre conciencia fonológica y procesos léxicos de la lectura. El estudio fue de tipo correlacional, longitudinal y diseño no experimental. Participaron 36 estudiantes procedentes de una institución educativa estatal de Lima Metropolitana, a quienes se evaluó en dos momentos: inicial 5 años y 2° grado de primaria. Se aplicaron la Prueba para la Evaluación del Conocimiento Fonológico - PECO y los subtest de Procesos Léxicos del PROLEC-R, ambos en sus versiones adaptadas. Los resultados evidenciaron que no existe relación significativa entre la conciencia fonológica y los procesos léxicos de la lectura. No obstante, se encontró una relación significativa entre la tarea identificación silábica y lectura de palabras en los índices de velocidad y habilidad lectora así como con el índice de habilidad lectora de lectura de pseudopalabras. Asimismo, se evidenció una relación significativa entre la tarea omisión silábica y lectura de pseudopalabras en el índice de habilidad lectora.

  11. An Analysis of Students Error in Solving PISA 2012 and Its Scaffolding

    OpenAIRE

    Sari, Yurizka Melia; Valentino, Erik

    2016-01-01

    Based on PISA survey in 2012, Indonesia was only placed on 64 out of 65 participating countries. The survey suggest that the students’ ability of reasoning, spatial orientation, and problem solving are lower compare with other participants countries, especially in Shouth East Asia. Nevertheless, the result of PISA does not elicit clearly on the students’ inability in solving PISA problem such as the location and the types of student’s errors. Therefore, analyzing students’ error in solving PI...

  12. Realización de un repositorio de Tesis doctorales y Trabajos Fin de Grado con DRUPAL

    OpenAIRE

    Orenes Cayuelas, Tomás

    2012-01-01

    Trabajo fin de grado que pretende la creación de un repositorio de tesis doctorales y trabajos fin de grado para la facultad de Comunicación de la universidad de Murcia. Existe el objetivo a su vez de observar los problemas que puedan surgir al crear el repositorio con un gestor de contenidos cuyo propósito final no es este. Pa...

  13. Rodded shutdown system for a nuclear reactor

    International Nuclear Information System (INIS)

    Golden, M.P.; Govi, A.R.

    1978-01-01

    A top mounted nuclear reactor diverse rodded shutdown system utilizing gas fed into a pressure bearing bellows region sealed at the upper extremity to an armature is described. The armature is attached to a neutron absorber assembly by a series of shafts and connecting means. The armature is held in an uppermost position by an electromagnet assembly or by pressurized gas in a second embodiment. Deenergizing the electromagnet assembly, or venting the pressurized gas, causes the armature to fall by the force of gravity, thereby lowering the attached absorber assembly into the reactor core

  14. APROXIMACIÓN A LA CONSERVACIÓN DE LOS BOSQUES AMAZÓNICOS A PARTIR DE LAS CONCEPCIONES DE LAS AVES EN LOS ESTUDIANTES DE GRADO TERCERO DE LA ESCUELA NORMAL SUPERIOR MONSEÑOR MARELINO EDUARDO CAYNES

    Directory of Open Access Journals (Sweden)

    July Milena Trujillo Duarte

    2013-07-01

    las concepciones de las aves en los estudiantes del grado tercero (3.1 J.T de la Escuela Normal Superior sede C, permiten fomentar la conservación de los bosques tropicales en un contexto intercultural, por medio de la investigación acción, en donde se pretende generar un nuevo conocimiento significativo y acorde con las características del contexto, para ello se utilizaron instrumentos como recolecta de información, grabaciones, fotografías, entre otros, que posibilitaron, teniendo en cuenta la riqueza de concepciones, proponer por parte de los estudiantes distintas alternativas que contribuyeron a la conservación: la realización de una campaña informativa sobre las problemáticas presentes en el colegio; la recolección de basuras tanto al interior como al exterior de la institución; además del desarrollo de una obra de teatro, en la cual se logró mostrar las causas de las diferentes acciones socioeconómicas que acaban con la selva amazónica, y perjudi can a la comunidad. Este estudio mostro la importancia de tener en cuenta el contexto en la realización de actividades, permitió además observar las concepciones tanto biológicas y culturales que tiene los estudiantes sobre las aves, al igual que reconocer conocimientos, creencias y prácticas que giran alrededor de estas, las cuales se perderían, sí los bosques tropicales desaparecieran, pues surgen a partir de las relaciones que se han establecido durante generaciones, debido a esto se pudo fomentar su conservación, evidenciándosela relevancia del diálogo entre conocimientos, ya que puede contribuir a transformar la realidad.

  15. Effect of paracetamol (acetaminophen) and ibuprofen on body temperature in acute ischemic stroke PISA, a phase II double-blind, randomized, placebo-controlled trial [ISRCTN98608690].

    NARCIS (Netherlands)

    D.W.J. Dippel (Diederik); E.J. van Breda (Eric); H.B. van der Worp (Bart); H.M.A. van Gemert (Maarten); R.J. Meijer (Ron); L.J. Kappelle (Jaap); P.J. Koudstaal (Peter Jan)

    2003-01-01

    textabstractBACKGROUND: Body temperature is a strong predictor of outcome in acute stroke. In a previous randomized trial we observed that treatment with high-dose acetaminophen (paracetamol) led to a reduction of body temperature in patients with acute ischemic stroke, even when

  16. Evolución de las emociones que experimentan los estudiantes del grado de maestro en educación primaria, en didáctica de la materia y la energía

    Directory of Open Access Journals (Sweden)

    Mª Antonia Dávila Acedo

    2015-01-01

    Full Text Available En la enseñanza de las ciencias, señalar el ámbito afectivo es un aspecto básico que constituye un logroimportante, pues reconocer el afecto como una emoción en los actos de conocer, pensar, actuar y relacionarse esfundamental en el proceso de aprendizaje. En este trabajo se pretende conocer y analizar las emociones queexperimentan los futuros maestros de Primaria en la asignatura de Didáctica de la Materia y la Energía, antes ydespués de la realización de los seminarios de prácticas, donde se realizan experiencias relacionadas conconceptos químicos y físicos. La muestra está constituida por 82 estudiantes de segundo del Grado de Maestroen Educación Primaria de la Universidad de Extremadura durante el curso académico 2013/2014. Los resultadosmuestran una evolución en las emociones experimentadas por los estudiantes antes y después de la realización delos seminarios prácticos.

  17. Trabajando el acercamiento a la naturaleza de los niños y niñas en el Grado de Educación Infantil. Crucial en la sociedad actual

    Directory of Open Access Journals (Sweden)

    Jerónimo Torres-Porras

    2017-01-01

    Full Text Available Los niños y niñas de la sociedad actual se encuentran alejados de entornos naturales y están necesitados de contacto con la naturaleza, lo que puede ser el motivo de distintos síntomas como estrés o ansiedad. Existen investigaciones que muestran que el contacto con la naturaleza es beneficioso para el desarrollo de los infantes además de fomentar una actitud más pro-ambiental. En este trabajo se pretende concienciar al alumnado del Grado de Educación Infantil de dichos beneficios mediante la ejecución de una serie de actividades centradas en el uso de los parques urbanos como recurso para el acercamiento a la naturaleza de los niños y las niñas de la etapa de infantil. Es necesario que tanto universidad, escuela y familia fomenten el uso y disfrute de estos espacios.

  18. Estilos de comunicación de los padres y su relación con la conducta agresiva en los alumnos del 4to y 5to grado de secundaria del Colegio Unión de Ñaña, Lima, 2015

    OpenAIRE

    Orbegozo Pérez, Esther

    2015-01-01

    La presente investigación corresponde a un diseño no experimental de corte transversal. El objetivo principal de la investigación fue determinar la relación entre los estilos de comunicación de los padres y la conducta agresiva en los alumnos del 4to y 5to grado de secundaria del colegio “Unión” de Ñaña,2015 III bimestre. La investigación se realizó con la participación de 63 alumnos de 4to y 5to grado de secundaria y sus respectivas madres.Para identificar el nivel de agresividad manifestada...

  19. How to replace a reactor pressure vessel

    International Nuclear Information System (INIS)

    Huber, R.

    1996-01-01

    A potential life extending procedure for a nuclear reactor after, say, 40 years of service life, might in some circumstances be the replacement of the reactor pressure vessel. Neutron induced degradation of the vessel might make replacement by one of a different material composition desirable, for example. Although the replacement of heavy components, such as steam generators, has been possible for many years, the pressure vessel presents a much more demanding task if only because it is highly irradiated. Some preliminary feasibility studies by Siemens are reported for the two removal strategies that might be considered. These are removal of the entire pressure vessel in one piece and dismantling it into sections. (UK)

  20. A Compact Quasi-axisymmetric Stellarator Reactor

    International Nuclear Information System (INIS)

    Ku, L.P.

    2003-01-01

    We report the progress made in assessing the potential of compact, quasi-axisymmetric stellarators as power-producing reactors. Using an aspect ratio A=4.5 configuration derived from NCSX and optimized with respect to the quasi-axisymmetry and MHD stability in the linear regime as an example, we show that a reactor of 1 GW(e) maybe realizable with a major radius *8 m. This is significantly smaller than the designs of stellarator reactors attempted before. We further show the design of modular coils and discuss the optimization of coil aspect ratios in order to accommodate the blanket for tritium breeding and radiation shielding for coil protection. In addition, we discuss the effects of coil aspect ratio on the peak magnetic field in the coils

  1. A plasma arc reactor for fullerene research

    Science.gov (United States)

    Anderson, T. T.; Dyer, P. L.; Dykes, J. W.; Klavins, P.; Anderson, P. E.; Liu, J. Z.; Shelton, R. N.

    1994-12-01

    A modified Krätschmer-Huffman reactor for the mass production of fullerenes is presented. Fullerene mass production is fundamental for the synthesis of higher and endohedral fullerenes. The reactor employs mechanisms for continuous graphite-rod feeding and in situ slag removal. Soot collects into a Soxhlet extraction thimble which serves as a fore-line vacuum pump filter, thereby easing fullerene separation from soot. Thermal gravimetric analysis (TGA) for yield determination is reported. This TGA method is faster and uses smaller samples than Soxhlet extraction methods which rely on aromatic solvents. Production of 10 g of soot per hour is readily achieved utilizing this reactor. Fullerene yields of 20% are attained routinely.

  2. Correlation of clayey gouge in a surface exposure of serpentinite in the San Andreas Fault with gouge from the San Andreas Fault Observatory at Depth (SAFOD)

    Science.gov (United States)

    Moore, Diane E.; Rymer, Michael J.

    2012-05-01

    Magnesium-rich clayey gouge similar to that comprising the two actively creeping strands of the San Andreas Fault in drill core from the San Andreas Fault Observatory at Depth (SAFOD) has been identified in a nearby outcrop of serpentinite within the fault zone at Nelson Creek. Each occurrence of the gouge consists of porphyroclasts of serpentinite and sedimentary rocks dispersed in a fine-grained, foliated matrix of Mg-rich smectitic clays. The clay minerals in all three gouges are interpreted to be the product of fluid-assisted, shear-enhanced reactions between quartzofeldspathic wall rocks and serpentinite that was tectonically entrained in the fault from a source in the Coast Range Ophiolite. We infer that the gouge at Nelson Creek connects to one or both of the gouge zones in the SAFOD core, and that similar gouge may occur at depths in between. The special significance of the outcrop is that it preserves the early stages of mineral reactions that are greatly advanced at depth, and it confirms the involvement of serpentinite and the Mg-rich phyllosilicate minerals that replace it in promoting creep along the central San Andreas Fault.

  3. Valoración de la sobrecarga en el cuidador del paciente con algún grado de dependencia hospitalizado en el servicio de neurocirugía del hospital universitario Erasmo Meoz entre octubre y noviembre del año 2005

    Directory of Open Access Journals (Sweden)

    Johanna Gallo

    2006-12-01

    Full Text Available Con el propósito de Valorar la Sobrecarga en el cuidador del paciente con algún grado de dependencia hospitalizado en el Servicio de Neurocirugía del Hospital Universitario Erasmo Meoz (HUEM, durante el periodo comprendido entre octubre a noviembre del año 2005 se desarrolló el presente estudio de tipo cuantitativo, descriptivo y de corte transversal. La población de estudio estuvo constituida por 22 cuidadores de los pacientes con algún grado de dependencia atendidos en el servicio de neurocirugía del Hospital Universitario Erasmo Meoz, de los cuales la muestra estuvo constituida por 13 cuidadores que cumplieron con los criterios de inclusión. En el cual se aplico el instrumento el índice de Barthel para la caracterización de los pacientes de acuerdo a la edad, sexo, diagnostico medico, régimen de salud y valoración del grado de dependencia; así mismo se aplicó el instrumento escala de Zarit para la caracterización de los cuidadores de acuerdo a la edad, sexo, escolaridad, parentesco, estado laboral actual, horas del cuidado al día. Se observó que el perfil característico del paciente es una mujer de 46 años o más; vinculado y con diagnóstico médico de Lesión Ocupando Espacio (LOE o Trauma Craneoencefalico (TCE. El nivel de dependencia más frecuente fue la dependencia total seguido por la dependencia grave. El cuidador es por lo regular, una mujer de 36 a 45 años, con algún grado de estudio, sin empleo actual que cuida más de seis horas diarias al paciente que por lo general es un familiar directo.

  4. Mode of operation of a nuclear reactor

    International Nuclear Information System (INIS)

    Morita, T.

    1976-01-01

    A method is proposed for the operation of a nuclear reactor guaranteeing an essentially symmetrical axial power distribution during normal operation by controlling the changes occuring in the reactor power partly by variation of the concentration of the neutron-absorbing element and partly by variation of the control rod positions. The representative parameters are recorded for the upper and lower half and adjusted to a predetermined reference value. In using this method, the axial power peals are reduced and power losses avoided. (RW) [de

  5. Discharges from a fast reactor reprocessing plant

    International Nuclear Information System (INIS)

    Barnes, D.S.

    1987-01-01

    The purpose of this paper is to assess the environmental impact of the calculated routine discharges from a fast reactor fuel reprocessing plant. These assessments have been carried out during the early stages of an evolving in-depth study which culminated in the design for a European demonstration reprocessing plant (EDRP). This plant would be capable of reprocessing irradiated fuel from a series of European fast reactors. Cost-benefit analysis has then been used to assess whether further reductions in the currently predicted routine discharges would be economically justified

  6. Effect of paracetamol (acetaminophen and ibuprofen on body temperature in acute ischemic stroke PISA, a phase II double-blind, randomized, placebo-controlled trial [ISRCTN98608690

    Directory of Open Access Journals (Sweden)

    Meijer Ron J

    2003-02-01

    Full Text Available Abstract Background Body temperature is a strong predictor of outcome in acute stroke. In a previous randomized trial we observed that treatment with high-dose acetaminophen (paracetamol led to a reduction of body temperature in patients with acute ischemic stroke, even when they had no fever. The purpose of the present trial was to study whether this effect of acetaminophen could be reproduced, and whether ibuprofen would have a similar, or even stronger effect. Methods Seventy-five patients with acute ischemic stroke confined to the anterior circulation were randomized to treatment with either 1000 mg acetaminophen, 400 mg ibuprofen, or placebo, given 6 times daily during 5 days. Treatment was started within 24 hours from the onset of symptoms. Body temperatures were measured at 2-hour intervals during the first 24 hours, and at 6-hour intervals thereafter. Results No difference in body temperature at 24 hours was observed between the three treatment groups. However, treatment with high-dose acetaminophen resulted in a 0.3°C larger reduction in body temperature from baseline than placebo treatment (95% CI: 0.0 to 0.6 °C. Acetaminophen had no significant effect on body temperature during the subsequent four days compared to placebo, and ibuprofen had no statistically significant effect on body temperature during the entire study period. Conclusions Treatment with a daily dose of 6000 mg acetaminophen results in a small, but potentially worthwhile decrease in body temperature after acute ischemic stroke, even in normothermic and subfebrile patients. Further large randomized clinical trials are needed to study whether early reduction of body temperature leads to improved outcome.

  7. Safety and efficacy of Ganoderma lucidum (lingzhi) and San Miao San supplementation in patients with rheumatoid arthritis: a double-blind, randomized, placebo-controlled pilot trial.

    Science.gov (United States)

    Li, Edmund K; Tam, Lai-Shan; Wong, Chun Kwok; Li, Wai Ching; Lam, Christopher W K; Wachtel-Galor, Sissi; Benzie, Iris F F; Bao, Yi Xi; Leung, Ping Chung; Tomlinson, Brian

    2007-10-15

    To examine the efficacy of popular Chinese herbs used in a traditional Chinese medicine (TCM) combination of Ganoderma lucidum and San Miao San (SMS), with purported diverse health benefits including antioxidant properties in rheumatoid arthritis (RA). We randomly assigned 32 patients with active RA, despite disease-modifying antirheumatic drugs, to TCM and 33 to placebo in addition to their current medications for 24 weeks. The TCM group received G lucidum (4 gm) and SMS (2.4 gm) daily. The primary outcome was the number of patients achieving American College of Rheumatology (ACR) 20% response and secondary outcomes included changes in the ACR components, plasma levels, and ex vivo-induced cytokines and chemokines and oxidative stress markers. Eighty-nine percent completed the 24-week study. Fifteen percent in the TCM group compared with 9.1% in the placebo group achieved ACR20 (P > 0.05). Pain score and patient's global score improved significantly only in the TCM group. The percentage, absolute counts, and CD4+/CD8+/natural killer/B lymphocytes ratio were unchanged between groups. CD3, CD4, and CD8 lymphocyte counts and markers of inflammation including plasma interleukin-18 (IL-18), interferon-gamma (IFNgamma)-inducible protein 10, monocyte chemoattractant protein 1, monokine induced by IFNgamma, and RANTES were unchanged. However, in an ex vivo experiment, the percentage change of IL-18 was significantly lower in the TCM group. Thirteen patients reported 22 episodes (14 in placebo group and 8 in TCM group) of mild adverse effects. G lucidum and San Miao San may have analgesic effects for patients with active RA, and were generally safe and well tolerated. However, no significant antioxidant, antiinflammatory, or immunomodulating effects could be demonstrated.

  8. Estimulación de la actividad péptica del jugo gástrico, inducida por látex de Croton palanostigma (sangre de grado

    Directory of Open Access Journals (Sweden)

    Miguel Sanvodal

    2008-09-01

    Full Text Available Objetivo: Determinar si la administración del látex de Croton palanostigma (sangre de grado, vía digestiva, modifica la actividad péptica de la secreción gástrica. Diseño: Estudio experimental. Institución: Centro de Investigación de Bioquímica y Nutrición Alberto Guzmán Barrón, Facultad de Medicina, Universidad Nacional Mayor de San Marcos. Material biológico: Ratas albinas machos adultos y sangre de grado. Métodos: Se usó 50 ratas albinas machos adultos, entre 200 y 250 g de peso, que fueron distribuidas aleatoriamente en 5 grupos, a los que se administró por vía oro-gástrica, y en dosis única, como sigue: grupo I: 0,8 mL/kg de sangre de grado; grupo II: 0,8 mL/kg de sangre de grado neutralizada; grupo III: ranitidina 50 mg/kg; grupo IV: control, con solución salina 0,9 g% (sin histamina; grupo V: control con solución salina 0,9 g%. Se realizó ligadura pilórica, por laparotomía, con anestesia de éter etílico. Se utilizó histamina, aplicada por vía subcutánea, para estimular la secreción, excepto al grupo IV. Cuatro horas después, se extrajo el jugo gástrico, se midió el volumen, el pH por potenciometría y la actividad de la pepsina, por el método de Anson modificado, expresado como µg de tirosina/mL. Principales medidas de resultados: Modificación de la actividad péptica de la secreción gástrica. Resultados: El volumen del jugo gástrico fue significativamente menor en los grupos II y III; que en los otros, entre los que no hubo diferencia estadística. El pH del grupo III (con ranitidina fue significativamente mayor que los otros, demostrando el efecto del fármaco. La actividad péptica fue: con sangre de grado 5,34+1,04; sangre de grado neutralizada 2,69+1,27; grupo ranitidina 2,57+0,88; el control sin histamina 3,29+0,94 y control con histamina 3,58+1,18. La actividad péptica fue significativamente mayor (+49,2% en el grupo con sangre de grado (p<0,01 que en los otros grupos. Conclusiones

  9. Fast breeder reactor safety : a perspective

    International Nuclear Information System (INIS)

    Kale, R.D.

    1992-01-01

    Taking into consideration India's limited reserves of natural and vast reserves of thorium, the fast reactor route holds a great promise for India's energy supply in future. The fast reactor fueled with 239 Pu/ 238 U (unused or depleted) produces (breeds) more fissionable fuel material 239 Pu than it consumes. Calculations show that a fast breeder reactor (FBR) increases energy potential of natural uranium by about 60 times. As the fast reactor can also convert 232 Th into 233 U which is a fissionable material, it can make India's thorium reserves a source of almost inexhaustible energy supply for a long time to come. Significant advantage of FBR plants cooled by sodium and their world-wide operating experience are reviewed. There are two main safety issues of FBR, one nuclear and the other non-nuclear. The nuclear issue concerns core disruptive accident and the non-nuclear one concerns the high chemical energy potential of sodium. These two issues are analysed and it is pointed that they are manageable by current design, construction and operational practices. Main findings of safety research during the last six to eight years in West European Countries and United States of America (US) are summarised. Three stage engineered safety provision incorporated into the design of the sodium cooled Fast Breeder Test Reactor (FBTR) commissioned at Kalpakkam are explained. The important design safety features of FBTR such as primary system containment, emergency core cooling, plant protection system, inherent safety features achieved through reactivity coefficients, and natural convection cooling are discussed. Theoretical analysis and experimental research in fast reactor safety carried out at the Indira Gandhi Centre for Atomic Research during the past some years are reviewed. (M.G.B.)

  10. Iodine chemistry in a reactor regulation

    International Nuclear Information System (INIS)

    Powers, D.A.

    1996-01-01

    Radioactive iodine has always been an important consideration in the regulation of nuclear power reactors to assure the health and safety of the public. Regulators adopted conservatively bounding predictions of iodine behavior in the earliest days of the development of nuclear power because there was so little known about either accidents or the chemistry of iodine. Today there is a flood of new information and understanding of the chemistry of iodine under reactor accident conditions. This paper offers some thoughts on how the community of scientists engaged in the study of iodine chemistry can present the results of their work so that it is more immediately adopted by the regulator. It is suggested that the scientific community consider the concept of consensus standards so effectively used within the engineering community to define the status of the study of radioactive iodine chemistry for reactor safety. (author) 9 refs

  11. Iodine chemistry in a reactor regulation

    Energy Technology Data Exchange (ETDEWEB)

    Powers, D A [Nuclear Regulatory Commission, Washington, DC (United States). Advisory Committee on Reactor Safeguards

    1996-12-01

    Radioactive iodine has always been an important consideration in the regulation of nuclear power reactors to assure the health and safety of the public. Regulators adopted conservatively bounding predictions of iodine behavior in the earliest days of the development of nuclear power because there was so little known about either accidents or the chemistry of iodine. Today there is a flood of new information and understanding of the chemistry of iodine under reactor accident conditions. This paper offers some thoughts on how the community of scientists engaged in the study of iodine chemistry can present the results of their work so that it is more immediately adopted by the regulator. It is suggested that the scientific community consider the concept of consensus standards so effectively used within the engineering community to define the status of the study of radioactive iodine chemistry for reactor safety. (author) 9 refs.

  12. Oferta académica de la URACCAN en el nivel de grado para el quinquenio 2014-2018

    OpenAIRE

    Letisia Castillo; Leonor Ruiz; Marlon Peralta; Alba Luz Dávila; Ivania Simons; Juan Francisco Perera Lumbí

    2013-01-01

    Esta investigación tuvo como propósito adecuar la oferta académica de la URACCAN, basada en las realidades y necesidades de formación profesional en el nivel de grado de la Costa Caribe de Nicaragua para el quinquenio 2014-2018. Se desarrolló en las Regiones Autónomas, específicamente en los municipios donde la Universidad tiene presencia (Bluefields, Laguna de Perlas, Nueva Guinea, El Coral, Almendro, San Miguelito, Siuna, Rosita, Bonanza, Waslala, Bilwi y Waspam). Se trabajó con los estudia...

  13. DEVELOPING PISA-LIKE MATHEMATICS TASK WITH INDONESIA NATURAL AND CULTURAL HERITAGE AS CONTEXT TO ASSESS STUDENTS MATHEMATICAL LITERACY

    Directory of Open Access Journals (Sweden)

    Wuli Oktiningrum

    2016-01-01

    Full Text Available The aim of this research is produce a set of PISA-like mathematics task with Indonesia natural and cultural heritage as context which are valid, practical, to assess students’ mathematics literacy. This is design research using type of development research with formative evaluation. A total of 20 students of SMP Negeri 1 Palembang. Beside, 10 experts were involved in this research to assess the feasibility of prototyping in terms of content, context and language. Walk through, documentation, questionnaire, test result, and interviews are way to collect the data. This research produced a PISA-like math task is as many 12 category of content, context, and process valid, practical and has potential effect. The validity came empirical evaluation of validation and reliability testing during small group. From the field test, we conclude that the tasks also potentially effect to the students’ mathematical literacy in activating the indicators of each Fundamental Mathematical Capabilities.

  14. Internal corium catcher of a nuclear reactor

    International Nuclear Information System (INIS)

    Anatolii S Vlasov; Vladimir N Mineev; Aleksandr S Sidorov; Yuri A Zeigarnik

    2005-01-01

    Full text of publication follows: A corium catcher is one of the main devices of a nuclear reactor that provides corium melt and fission products retention within a containment during severe accidents. Several studies and design developments have shown that corium retention within a reactor vessel can be attained with a moderate capacity of the latter (up to 600 - 650 MW el.). With a higher reactor capacity external corium catchers are applied both at Russian (VVER-1000) and European (EPR) reactors. In the external catcher of a VVER-1000 reactor, most technological problems are solved due to using sacrificial material. They are as follows: (a) endo-thermal interaction of corium and sacrificial material reduces a level of the temperatures in the final melt pool; (b) solution in the melt of a great amount of the sacrificial material reduces the specific heat release density and the heat flux density at the boundaries of a melt; (c) due to changing of the oxide-component density an inverse stratification of the metallic and oxide components of the corium takes place, thus excluding heat-flux focusing in the zone of the metallic layer and making it possible to supply water on the free surface of the corium without a danger of incipience of the vapor explosion; (d) final oxidation of zirconium occurs without hydrogen generation. The above principles have been realized in the external catcher of the VVER- 1000 reactor at Tyanvan NPS that is presently under construction in China. Successfully solving of the problems concerning to the external catcher makes it possible to return on the new conceptual and technological basis to the idea of retention of the corium melt inside the vessel of a nuclear reactor of large capacity, that is, to provide the reactor vessel to play a role of an internal catcher. For this purpose, a reactor vessel is elongated by approximately two meters. In the lower part of the vessel, on elliptical bottom, pieces of sacrificial material are arranged

  15. Discussion of the use of the Dragon reactor as a facility for integral reactor physics experiments

    Energy Technology Data Exchange (ETDEWEB)

    Gutmann, H

    1972-06-05

    The purpose and use of the Dragon Reactor Experiment (DRE) has changed considerably during the years of its operation. The original purpose was to show that the principle of a High Temperature Reactor is sound and demonstrate its operation. After this achievement, the purpose of the Dragon reactor changed to the use as a fuel testing facility. During recent years, a new use of the DRE has been added to its use as a fuel testing facility, namely Fuel Element Design Testing. The current report covers reactor physics experiments aspects.

  16. Choto-san in the treatment of vascular dementia: a double-blind, placebo-controlled study.

    Science.gov (United States)

    Terasawa, K; Shimada, Y; Kita, T; Yamamoto, T; Tosa, H; Tanaka, N; Saito, Y; Kanaki, E; Goto, S; Mizushima, N; Fujioka, M; Takase, S; Seki, H; Kimura, I; Ogawa, T; Nakamura, S; Araki, G; Maruyama, I; Maruyama, Y; Takaori, S

    1997-03-01

    In an earlier placebo-controlled study, we demonstrated that a kampo (Japanese herbal) medicine called Choto-san (Diao-Teng-San in Chinese) was effective in treating vascular dementia. To evaluate its efficacy using more objective criteria, we carried out a multi-center, double-blind study of Choto-san extract (7.5 g/day) and a placebo, each given three times a day for 12 weeks to patients suffering from this condition. The study enrolled and analyzed 139 patients, 50 males and 89 females, with a mean age of 76.6 years. Choto-san was statistically superior to the placebo in global improvement rating, utility rating, global improvement rating of subjective symptoms, global improvement rating of psychiatric symptoms and global improvement rating of disturbance in daily living activities. Such items as spontaneity of conversation, lack of facial expression, decline in simple mathematical ability, global intellectual ability, nocturnal delirium, sleep disturbance, hallucination or delusion, and putting on and taking off clothes were significantly improved at one or more evaluation points in those taking Choto-san compared to those taking the placebo. Furthermore, the change in revised version of Hasegawa's dementia scale from the beginning point in Choto-san group was tended to be higher than that in placebo group with no statistical significance. These results suggest that Choto-san is effective in the treatment of vascular dementia. Copyright © 1997 Gustav Fischer Verlag. Published by Elsevier GmbH.. All rights reserved.

  17. Reactor core and passive safety systems descriptions of a next generation pressure tube reactor - mechanical aspects

    Energy Technology Data Exchange (ETDEWEB)

    Yetisir, M.; Gaudet, M.; Rhodes, D.; Hamilton, H.; Pencer, J. [Atomic Energy of Canada Limited, Chalk River, ON (Canada)

    2014-07-01

    Canada has been developing a channel-type supercritical water-cooled nuclear reactor concept, often called the Canadian SCWR. The objective of this reactor concept is to meet the technology goals of the Generation IV International Forum (GIF) for the next generation nuclear reactor development, which include enhanced safety features (inherent safe operation and deploying passive safety features), improved resource utilization, sustainable fuel cycle, and greater proliferation resistance than Generation III nuclear reactors. The Canadian SCWR core concept consists of a high-pressure inlet plenum, a separate low-pressure heavy water moderator contained in a calandria vessel, and 336 pressure tubes surrounded by the moderator. The reactor uses supercritical water as a coolant, and a direct steam power cycle to generate electricity. The reactor concept incorporates advanced safety features such as passive core cooling, long-term decay heat rejection to the environment and fuel melt prevention via passive moderator cooling. These features significantly reduce core damage frequency relative to existing nuclear reactors. This paper presents a description of the design concepts for the Canadian SCWR core, reactor building layout and the plant layout. Passive safety concepts are also described that address containment and core cooling following a loss-of coolant accident, as well as long term reactor heat removal at station blackout conditions. (author)

  18. DHX - Virtual reality storyboard: the case of the visual and acoustic tour of the Baptistery of Pisa

    OpenAIRE

    Palamidese, Patrizia; Carreras, Francesco; Coltelli, Primo; Massei, Leonardo; Bigliazzi, M.

    2003-01-01

    This report contains the detailed storyboard design of a non-linear story that describes a virtual visit of the Baptistery of Pisa, developed within the European project DHX - Digital Artistic and Ecological Heritage Exchange - IST-2001-33476, and described into the "Deliverable D2e.4 - Storyboard of the research prototype scenario" of the project. The scenario architecture makes use of digital storytelling and traditional dramaturgic concepts such as scenes layout, timing, emotional effects,...

  19. Fuel transfer system for a nuclear reactor

    International Nuclear Information System (INIS)

    Katz, L.R.; Marshall, J.R.; Desmarchais, W.E.

    1977-01-01

    Disclosed is a fuel transfer system for moving nuclear reactor fuel assemblies from a new fuel storage pit to a containment area containing the nuclear reactor, and for transferring spent fuel assemblies under water from the reactor to a spent fuel storage area. The system includes an underwater track which extends through a wall dividing the fuel building from the reactor containment and a car on the track serves as the vehicle for moving fuel assemblies between these two areas. The car is driven by a motor and linkage extending from an operating deck to a chain belt drive on the car. A housing pivotally mounted at its center on the car is hydraulically actuated to vertically receive a fuel assembly which then is rotated to a horizontal position to permit movement through the wall between the containment and fuel building areas. Return to the vertical position provides for fuel assembly removal and the reverse process is repeated when transferring an assembly in the opposite direction. Limit switches used in controlling operation of the system are designed to be replaced from the operating deck when necessary by tools designed for this purpose. 5 claims, 8 figures

  20. Competencias desde la perspectiva intercultural para el grado de educación infantil

    Directory of Open Access Journals (Sweden)

    Fernando GONZÁLEZ ALONSO

    2005-01-01

    adecuar sus titulaciones hacia el Espacio Europeo de Educación Superior, a través de la planificación de los grados en Educación Infantil y Educación Primaria. La propuesta de competencias específicas desde la perspectiva intercultural para Educación infantil, puede resultar un interesante punto de partida.