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Sample records for san piero a grado pisa reactor

  1. The Pilot Restoration Yard of the Church of San Frediano in Pisa: Results of a Multidisciplinary Study

    Science.gov (United States)

    Baracchini, C.; Pini, R.; Fabiani, F.; Ciafaloni, M.; Siano, S.; Salimbeni, R.; Sabatini, G.; Giamello, M.; Franzini, M.; Lezzerini, M.; Spampinato, M.; Gravina, F.; Andreazzoli, F.

    In the frame of the EC Project "RIS+ Tuscany: Transfer of innovative technologies for Cultural Heritage" we carried out a pilot restoration yard to apply and evaluate laser cleaning procedures in the conservation of stones and decorations on the façade of the church of S. Frediano (XI-XII Cent.) in Pisa. A multidisciplinary scientific committee was established, formed by art historians, architects, physicists, geologists, and conservators. Italian firms involved in conservation services and in laser technology participated in the project. The conservation has been recently completed after two years of work, providing a critical evaluation on the effectiveness and safety of optimized laser cleaning operations, the definition of an integrated conservation protocol which included the laser technique, as well as other conventional cleaning techniques, and the evaluation of time productivity and operative costs of laser operations.

  2. Programa educativo dirigido a elevar el nivel de conocimientos sobre enfermedades de la cavidad bucal y medidas preventivas en alumnos del primer grado de la I.E.P seminario de San Carlos y San Marcelo del Distrito de Trujillo

    OpenAIRE

    Fern??ndez Guarniz, Lourdes Elvira

    2015-01-01

    Se realiz?? un estudio con el objetivo de demostrar que el programa educativo denominado Sonrisas , es efectivo en la medida que modifica favorablemente los conocimientos acerca de las principales enfermedades bucales y medidas preventivas en los ni??os de primer grado del I.E.P Seminario de San Carlos y San Marcelo del distrito de Trujillo en el periodo de marzo a junio del 2014 previo consentimiento informado, se evalu?? el conocimiento sobre salud bucal antes y despu??s de la intervenci??n...

  3. Pisa testing. A global educational race?

    Science.gov (United States)

    Sjøberg, Svein

    2017-10-01

    The OECD's PISA project is not an educational project. It is a political project and has to be understood as an instrument of power. PISA is normative, it tells what young people should learn, regardless of the nations' culture, nature, traditions and values. The battle to improve PISA rankings may conflict with our work to make science relevant, contextualized, interesting and motivating for young learners.

  4. Piero Sraffa (1898-1983

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    N. KALDOR

    2013-12-01

    Full Text Available Piero Sraffa (1898-1983 was one of the most extraordinary people at Cambridge, where he lived from 1927 to 1983. This, according to those who knew him, and above all the professors of the Faculty of Economics and the members of the Colleges he belonged to, the King’s and the Trinity. Sraffa had a very rare quality in that he was a very meticulous scholar and at the same time a brilliant and original thinker. In this tribute, Sraffa’s life and career are highlighted, including the major issues he contributed to and his lasting impact in the field of economics.

  5. [The temperament evaluation of the Memphis, Pisa, Paris, and San Diego autoquestionnaire, Argentine version (TEMPS-A Buenos Aires)].

    Science.gov (United States)

    Vázquez, Gustavo H; Akiskal, Hagop

    2005-01-01

    One of the major points of interest in the study of affective temperaments is the possibility of exploring the clinical significance of sub-affective traits as predictors of the development and inter-episodic manifestation of recurrent mood disorders within the bipolar illness spectrum. The TEMPS-A scale is a self-evaluation questionnaire used worldwide to assess the four basic affective temperaments (hyperthymic, depressive, cyclothymic, and irritable), and the anxious temperament. The TEMPS-A questionnaire version that includes 110 items has been locally adapted from the version used in Spain, which in turn was produced by following the translation / retro-translation method. A locally-adapted version was produced from the version used in Spain. This local version was subsequently translated into English by a bilingual translator. A satisfactory adaptation of the version used in Spain was achieved, as confirmed by the retro-translation into English, and its subsequent approval by the authors of the scale. The Argentine version of the TEMPS-A self-evaluation questionnaire for the assessment of affective temperaments can be considered equivalent to the original version, and used as an important instrument for the clinical investigation of affective disorders in our country.

  6. Regulative theory of temperament versus affective temperaments measured by the temperament evaluation of Memphis, Pisa, Paris and San Diego Auto-questionnaire (TEMPS-A: a study in a non-clinical Polish sample

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    Włodzimierz Oniszczenko

    2017-02-01

    Full Text Available Background This study investigates the relationship between temperament traits postulated by Strelau’s regulative theory of temperament (RTT and Akiskal’s affective temperaments. This study represents the first attempt to compare these two concepts in a non-clinical Polish sample. Participants and procedure The study involved 615 healthy Caucasian adults (395 women and 220 men aged from 17 to 69 years (M = 30.79, SD = 9.69. Temperament traits postulated by the RTT were assessed with the Formal Characteristics of Behaviour–Temperament Inventory. The Polish version of the Temperament Evaluation of Memphis, Pisa, Paris and San Diego Auto-questionnaire (TEMPS-A was used to assess affective temperaments (depressive, cyclothymic, hyperthymic, irritable and anxious. Results Emotional reactivity and perseveration (RTT positively correlated with anxious, cyclothymic, depressive and irritable temperaments (TEMPS-A, predicting from 2% (irritable temperament to 24% (anxious temperaments of the variance in the affective temperaments. Hyperthymic temperament (TEMPS-A positively correlated with briskness, sensory sensitivity, endurance and activity (RTT. Activity was the best predictor of hyperthymic temperament, accounting for 25% of the variance. TEMPS-A scores showed that women were more depressive, cyclothymic and anxious and less hyperthymic than men. Conclusions These results suggest that two RTT traits, emotional reactivity and perseveration, may be related to all the affective temperaments of TEMPS-A, except hyperthymic temperament, which is most likely linked to the RTT activity trait.

  7. A Case Study of Albania's Participation in PISA 2009

    Science.gov (United States)

    Harizaj, Alfons

    2011-01-01

    The paper presents a view of the results and progress of Albania in the Programme for International Students' Assessments 2009 (PISA 2009). The overall goal and objectives of PISA are to offer support and expertise in the field of the evaluation of educational development factors in Albania. One of the methods successfully used for monitoring the…

  8. 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....

  9. Process of adaptation to Spanish of the Temperament Evaluation of Memphis, Pisa, Paris and San Diego Scale. Self applied version (TEMPS-A).

    Science.gov (United States)

    Sánchez-Moreno, J; Barrantes-Vidal, N; Vieta, E; Martínez-Arán, A; Saiz-Ruiz, J; Montes, J M; Akiskal, K; Akiskal, H S

    2005-01-01

    Investigation of the predisposing factors for affective disorders has shown that measures to assess affective temperament are necessary. The TEMPS-A is a self-evaluation measure to assess four affective temperaments (hyperthymic, depressive, cyclothymic and irritable) and anxious temperament. The TEMPS-A questionnaire version that includes 110 questions has been adapted following the translation-backtranslation methodology, including two translations to Spanish and the classification of equivalence to English by an independent author. The study results indicated that a satisfactory translation was obtained, as indicated by the validation of equivalence by the bilingual consultant. All the items showed a perfect (A) or satisfactory equivalence (B). The TEMPS-A, Spanish version, is an understandable questionnaire that is equivalent to the original version in English, that allows for the evaluation of affective temperaments.

  10. 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.

  11. Il senso del confine – Colloquio con Piero Zanini

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    Antonella Valentini

    2015-11-01

    Full Text Available This interview with Piero Zanini has a particular interest. At the end of Nineties he firstly faced the theme of boundary, explored through a wide range of sources, not only related to architecture but also referred to geography, moving, literature, anthropology. This argument is now one of the most discussed between planners and designers and therefore the considerations here showed, that send to the complex discussion begun in 1997, are particularly actual and source of suggestions. 

  12. 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.

  13. A cytotoxic substance from Sangre de Grado.

    Science.gov (United States)

    Itokawa, H; Ichihara, Y; Mochizuki, M; Enomori, T; Morita, H; Shirota, O; Inamatsu, M; Takeya, K

    1991-04-01

    Taspine has been isolated as a cytotoxic substance from Sangre de Grado, sap of Croton palanostigma (Euphorbiaceae), by bioassay guided fractionation. The cytotoxicity (IC50) of taspine was found to be 0.39 microgram/ml against KB cells and 0.17 microgram/ml against V-79 cells.

  14. ALCANCES EN LA DOCENCIA DE POST-GRADO: ODONTOPEDIATRÌA

    OpenAIRE

    Guillén Borda, Celso; Profesor responsable de la Segunda Especialidad Jefe del Departamento de Estomatología Pediátrica U.N.M.S.M. Jefe del Departamento de odontopediatría del I.S.N.

    2014-01-01

    La facultad de Odontología de la Universidad nacional Mayor de San Marcos tiene entre sus funciones otorgar títulos y grados de pre y post-grado. En el caso de post-grado, según lo establece el estatuto universitario organiza y planifica el funcionamiento de la Segunda Especialidad. En Odontopediatría. se realizo un plan curricular de dos años de duración donde se incluye cursos generales dictados en la facultad de odontología. La facultad de Odontología de la Universidad nacional Mayor de...

  15. 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

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

    OpenAIRE

    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. Di...

  17. The relevance and consequences of PISA science in a Danish context

    DEFF Research Database (Denmark)

    Dolin, Jens; Krogh, Lars Brian

    2010-01-01

    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 the PISA 20....../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....

  18. 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.

  19. Communities of Practice and PISA for Schools: Comparative Learning or a Mode of Educational Governance?

    Science.gov (United States)

    Lewis, Steven

    2017-01-01

    This paper examines the Organization for Economic Cooperation and Development's (OECD) "PISA for Schools," a new variant of the Programme for International Student Assessment (PISA) that compares school-level performance on reading, math and science with international schooling systems (e.g., Shanghai-China, Finland). Specifically, I…

  20. 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.

  1. Optimization of a polarizer device for SANS-2 instrument at the PIK reactor

    Science.gov (United States)

    Pavlov, K. A.; Konik, P. I.; Syromyatnikov, V. G.; Grigoriev, S. V.; Moskvin, E. V.

    2017-06-01

    A polarizer of V-cavity type for small angle diffractometer was considered. The device performance was simulated using McStas ray tracing package with the input parameters for supermirrors of PNPI home production (CoFe/TiZr, m = 2.13). Two replaceable devices with lengths 0.75 m and 1.8 m are proposed to cover the wavelength range 4-25 Å with beam polarization not less than 95%.

  2. 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

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    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

  3. A multidimensional Rasch analysis of gender differences in PISA mathematics.

    Science.gov (United States)

    Liu, Ou Lydia; Wilson, Mark; Paek, Insu

    2008-01-01

    Since the 1970s, much attention has been devoted to the male advantage in standardized mathematics tests in the United States. Although girls are found to perform equally well as boys in math classes, they are consistently outperformed on standardized math tests. This study compared the males and females in the United States, all 15-year-olds, by their performance on the PISA 2003 mathematics assessment. A multidimensional Rasch model was used for item calibration and ability estimation on the basis of four math domains: Space and Shape, Change and Relationships, Quantity, and Uncertainty. Results showed that the effect sizes of performance differences are small, all below .20, but consistent, in favor of boys. Space and Shape displayed the largest gender gap, which supports the findings from many previous studies. Quantity showed the least amount of gender difference, which may be explained by the hypothesis that girls perform better on tasks that they are familiar with through classroom practice.

  4. 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

  5. Repromissionis pagina. Pratiche di documentazione a Pisa nel secolo XI

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    Antonella Ghignoli

    2013-01-01

    Full Text Available The object of this study is the notarial practice in Pisa in the eleventh century. First (§ 1 the Author discusses the charters preserved within the period c. 720-c.1100 in their number, form and tipology, both as object of diplomatics and as sources for the economic and social history. Then the A. focuses on the sales (chartae venditionis of the tenth century (§ 2 and the 'promises' (chartae promissionis of the eleventh century - the so called repromissionis paginae, as the pisan notars usually said in the charters of this period: the 'charters of promise' are the real new entry in the surviving charters evidence of Pisa and its own territory (§ 4. In this first part of the paper the A. explores the evolution of their form and establishes the textual structure of both types of charters, by focusing on formulae, that the scholars have never considered before, and explaining them: for example, the formula "cum portione seu exemplar", wich is so typical in some charters of sale (§ 3, and the formula "eidem omini qui unc promissio pre manibus abuerit", wich gained a pregnant sense in the charters of promise (§ 5. The A. discusses also the way, in wich the charters are transmissed: in the case of sales, wich in the tenth and eleventh century are mostly transmissed only in notarial contemporary copy, the A. shows (§ 3 that the practice of making copy was a specific phase by recording the transactions of portions of lands and properties, wich were possessed by consortes. 
The main point of the study is however the practice - typical for the eleventh century in Pisa - of writing chartae venditionis and repromissionis paginae together, by the same notar, with the same issuers and beneficiaries and the same datatio. These charters demonstrate the existence of a specific practice, wich notars and judges set up to put on records and made sure in each phase (wich could last for years the credit transactions based on landed property as

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

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    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

  7. L’„eretico” Piero Gobetti e le tre “dimensioni” della storia del Risorgimento

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    Leone Melillo

    2017-11-01

    ABSTRACT: Piero Gobetti’s “the heresy of the Risorgimento” allows to distinguish three “points of view” of the political and cultural experience of the “heretical” Gobetti, the “theoretical” one, the “practical” one and “personal” one. Three “profiles” that realized a systematic dimension, in the relationship of the Risorgimento with the “Liberal Revolution”, according to a research perspective that has never been fully analyzed. A reflection that highlights the “drama of the Risorgimento”, the “programmatic formulas” of “The Liberal Revolution” and Piero Gobetti's “clarity of authentic feelings” which moves on the “ground of heresy” with his “choice” of life.

  8. Reseña de Varile. G. B. y A. Zampolli (eds (1997: Survey of the State of the Art in Human Language Technology. Linguistica Computazionale. vol. XII-XIII. Giardini Editori e Stampatori in Pisa., Pisa, Italy.

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    M. Ángeles Zarco Tejada

    2011-04-01

    Full Text Available Normal 0 21 false false false ES X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Se trata de una reseña de Varile. G. B. y A. Zampolli (eds (1997: Survey of the State of the Art in Human Language Technology. Linguistica Computazionale. vol. XII-XIII. Giardini Editori e Stampatori in Pisa., Pisa, Italy.

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

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    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.

  10. A PISA Paradox? An Alternative Theory of Learning as a Possible Solution for Variations in PISA Scores

    Science.gov (United States)

    Komatsu, Hikaru; Rappleye, Jeremy

    2017-01-01

    Variations in mean PISA scores have not been adequately explained to date, suggesting the limits of our current understanding of the relationship between educational practices and students' performance. In contrast to previous research that applies existing theories to explain observed variations, this study attempts to extend our existing…

  11. Estado actual de la enseñanza de Toxicología en la Universidad de Alcalá: estudios de grado y post-grado

    OpenAIRE

    MJ González-Muñoz; CJ. Mateos-Vega

    2010-01-01

    La Toxicología en la Universidad de Alcalá se imparte tanto en estudios de grado como de post-grado. La adaptación al espacio europeo ha supuesto, en general, una reducción de la carga docente, con los inconvenientes que ello conlleva. Actualmente sólo está implantado el Grado de Ciencias Ambientales, mientras que los Grados de Farmacia y Medicina están pendientes de verificación. Respecto a la Enseñanza de Post-grado, los contenidos toxicológicos forman parte de diversos programas de Doctora...

  12. The PISA Results in Mathematics and Science: A comparison between Israel and Turkey

    Directory of Open Access Journals (Sweden)

    Hanna DAVID

    2015-08-01

    Full Text Available Comparing the PISA 2012 achievements of Turkey and Israel in Mathematics and science has been an intriguing challenge. Israel was one of the first 12 countries taking part in the first International Mathematics assessment: The TIMSS 1963/4; it had the best achievements both in grade 4 and 8 (ibid. Turkey started participating in International evaluations only in 1999. Since the 1963/4 first international examinations, the Israeli situation has changed substantially by the 80ies, and not in any desirable direction. Turkey, on the other hand, has demonstrated a gradual, constant improvement in the PISA achievements – both in mathematics and science. In this study a brief comparison between these two countries will be presented regarding the achievement in the first decade of the 21st century. This article consists of three main parts: Why comparing Israel and Turkey?, Achievements comparisons between Israel and Turkey, and Why are the Israeli PISA 2012 results actually lower than reported.

  13. PISA Etnisk

    DEFF Research Database (Denmark)

    2015-01-01

    The chapter explores the role of and debate concerning the of testing in the educational history of migrant pupils from 1970s to the so called PISA Etnisk-reports from the 2000s onwards......The chapter explores the role of and debate concerning the of testing in the educational history of migrant pupils from 1970s to the so called PISA Etnisk-reports from the 2000s onwards...

  14. Comentarios a una tesis de grado

    Directory of Open Access Journals (Sweden)

    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.

  15. Le più antiche fondazioni di canoniche regolari a Pisa tra XI e XII secolo: vicende storiche e rappresentazione documentaria

    Directory of Open Access Journals (Sweden)

    Antonino Mastruzzo

    2016-01-01

    Full Text Available Our information on the foundation of Pisa's oldest canons regular rectories, Santa Maria a Fine and San Pietro in Vincoli, comes from a series of diplomatically- anomalous documents. This essay discusses various hypotheses regarding their possible falsification, adjustment and copying. Definitively, however, it seems more plausible that said documents were drawn up at a later time than that expressly declared on the founding documents and that they should be read with an aim to retrospectively reconstruct the town's ecclesiastic history materialised via these documents.

  16. Relación entre la memoria no verbal con el rendimiento ortográfico en estudiantes del sexto grado de primaria de la institución educativa San Juan Macías del distrito de San Luis

    OpenAIRE

    Cáceres Villanueva, Carmen Patricia

    2014-01-01

    La presente investigación tiene por objetivo determinar la relación entre la Memoria no verbal y el Rendimiento ortográfico. La población estuvo conformada por 123 estudiantes del 6º grado de primaria de la I. E. San Juan Macías del distrito de San Luis. La investigación es de enfoque cuantitativo y la metodología sigue un diseño descriptivo correlacional, en la cual se utilizaron dos instrumentos: el Test de memoria y aprendizaje que evalúa la memoria no verbal de Reynolds y Bigler (1994...

  17. 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…

  18. 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…

  19. 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.

  20. Programa “Cuido mi País” para la interiorización de los valores culturales de los estudiantes de quinto grado en el Colegio Adventista José de San Martín, Tarapoto, 2014.

    OpenAIRE

    Quispe Quiliano, María Pilar

    2014-01-01

    El presente estudio queda enmarcado y enlazados en las exigencias del objetivo general: determinar la efectividad del Programa Cuido mi país en la interiorización de los valores culturales y fomentar el amor a la cultura de los estudiantes de quinto grado del Colegio Adventista José de San Martín, Tarapoto. Además de este objetivo se desprenden cuatro objetivos específicos: a) Determinar en qué medida el programa Cuido mi País contribuye en la interiorización de las costumbres en los estudian...

  1. Does my patient have a pulmonary embolism? The Wells vs. PISA 2 rule in orthopedic patients.

    Science.gov (United States)

    Russell, Linda A; Sigmund, Alana E; Szymonifka, Jackie; Jawetz, Shari T; Grond, Sarah E; Dey, Shirin A; Bass, Anne R

    2018-01-25

    The diagnosis of venous thromboembolism is difficult in the postoperative setting because signs such as hypoxemia, leg pain, and swelling are so common. CTPA can also detect subsegmental PE (SSPE), of which the clinical significance has been widely debated. Clinical decision rules (CDR), such as the Wells and PISA 2, have been developed to identify symptomatic patients at low risk for PE who could forgo imaging. We performed this study in order to (1) compare the performance of the Wells and PISA 2 CDR in orthopedic patients; (2) compare CDR scores in patients with subsegmental PE (SSPE) versus larger clots; and (3) identify variables that improve performance of the Wells in orthopedic patients. This retrospective cohort study included all orthopedic surgery patients that underwent computerized tomographic pulmonary angiography at a single institution from 1/1/13 to 12/31/14 and had data to calculate both Wells and PISA 2 scores. CDR sensitivity, specificity and c-statistics were calculated. Multivariable logistic regression was used to identify variables that improved CDR performance. 402 patients were included in the study. The Wells rule (cutoff > 4) had sensitivity 74% and specificity 45%. PISA 2 (cutoff 0.6) had sensitivity 90% and specificity 11%. The Wells performed better than PISA 2: c-statistic 0.60 vs. 0.50; p = 0.007. The mean Wells score was 5.20 ± 1.68 for patients with SSPE and 5.41 ± 1.86 for patients with larger clots. Adding the variables prior smoking and varicose veins improved the performance of the Wells rule (c-statistic 0.66 vs. 0.60, p = 0.008). The Wells rule (cutoff > 4) performs better than PISA 2 in orthopedic patients. Neither can distinguish patients with SSPE from those with larger clots. Although adding past smoking and varicose veins to the Wells improves its performance, this requires validation in other populations.

  2. 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.

  3. 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; Institución Educativa Particular San Andrés

    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...

  4. 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…

  5. Building Capacity for Assessment in PISA for Development Countries. PISA for Development Brief 14

    Science.gov (United States)

    OECD Publishing, 2017

    2017-01-01

    This article explains how the Program for International Student Initiative for Development (PISA-D) initiative aims to make PISA more accessible to middle- and low-income countries. A key component of PISA-D is building capacity in the participating countries for managing large-scale student learning assessments and using the results to support…

  6. 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…

  7. 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.

  8. Choice of a PISA selector in a hybrid algorithmic structure for the FJSSP

    Directory of Open Access Journals (Sweden)

    Mariano Frutos

    2015-04-01

    Full Text Available This paper analyzes the choice of a PISA selector for a Hybrid Algorithm integrating it as a Multi-Objective Evolutionary Algorithm (MOEA with a path-dependent search algorithm. The interaction between these components provides an efficient procedure for solving Multi-Objective Problems (MOPs in operations scheduling. In order to choose the selector, we consider both NSGA and SPEA as well as their successors (NSGAII and SPEAII. NSGAII and SPEAII are shown to be the most efficient candidates. On the other hand, for the path-dependent search at the end of each evolutionary phase we use the multi-objective version of Simulated Annealing.

  9. Governando a educação pelo espelho do perito: uma análise do pisa como instrumento de regulação Governing education with the expert mirror: an analysis of pisa as a regulation tool

    Directory of Open Access Journals (Sweden)

    Luís Miguel Carvalho

    2009-12-01

    Full Text Available Este artigo analisa o Programme for International Student Assessment (PISA, desenvolvido sob a égide da OCDE, como um instrumento baseado e gerador de conhecimento que participa na coordenação da acção pública no sector educativo. O texto retoma as análises desenvolvidas numa pesquisa sobre a fabricação supranacional do Programa PISA, realizada no âmbito de um projecto de investigação europeu acerca do papel do conhecimento nas políticas públicas de educação e saúde na Europa - Knowandpol. Equacionando o PISA - em suas actividades de inquirição, organização e publicação - como um complexo processo de construção de um espaço de regulação política transnacional, o artigo analisa os elementos cognitivos e normativos do instrumento relacionados com a definição da "realidade educacional", com a determinação das formas "apropriadas" ao seu governo, e com a produção de conhecimento para a política.The article analyses the OECD's Programme for International Student Assessment (PISA as a tool - knowledge-based and knowledge-generator - that participates in the coordination of public action in the field of education. The text is based on a previous research on the supranational fabrication of PISA, carried out within a large-scale European research project on the role of knowledge in Health and Education public policies - Knowandpol. The article examines PISA - and its multiple and related activities of inquiry, organization and publication - as a policy tool, and analyses its cognitive and normative features concerning tree issues: the definition of "educational reality"; the set up of appropriate forms of governing education, and the production of knowledge for policy.

  10. La prueba PISA: una mirada alternativa desde la Teoría del Actor-Red

    Directory of Open Access Journals (Sweden)

    Paola Paredes Suzarte

    2015-07-01

    Full Text Available En el marco de la proliferación de las evaluaciones estandarizadas, inscritas en lo que ha sido conceptualizado por la literatura como políticas de accountability o de rendición de cuentas, se ofrece por medio de este artículo una línea de pensamiento y discusión alternativa sobre la prueba PISA. Utilizando como enfoque la Teoría del Actor-Red (TAR de Bruno Latour, se presentan ejercicios de traslación epistémica de la prueba PISA desde un modelo de pensamiento positivista moderno, a uno materialista pragmático en el que se privilegia una descripción constructivista y analítica de los componentes que la constituyen. En base al seguimiento y análisis de noticias sobre la prueba PISA desplegadas en diarios electrónicos en Chile y Argentina, más la revisión de fuentes secundarias, se exponen algunas de las controversias suscitadas en torno a la evaluación y se discute sobre su posible impacto en nuestras percepciones sobre educación y calidad. También se problematiza el carácter neutral y objetivo de la prueba, y se levanta la pregunta acerca de su posible agencia en la cristalización de las relaciones de centro-periferia entre países que, en el marco del enfoque de la TAR, tiene sentido explorar. 

  11. [Andreas Vesalius in Pisa].

    Science.gov (United States)

    Ciranni, Rosalba

    2010-01-01

    Andreas Vesalius is the most commanding figure in European medicine, after Galen and before Harvey. His dissections and lectures were in considerable demand. Having just published the De humani corporis fabrica, and before operating as a private physician of Emperor Charles V, the anatomist spent some months conducting demonstrations of anatomy at the universities of Bologna, Pisa and Florence. The present study aim to reconstruct the journey he made to Pisa, where he was invited by Duke Cosimo I De' Medici. The work of Andrea Corsini and O'Malley, the study of Vesalius' Epistola... rationem modumque propinandi radicis Chynae dedocti... , and other documents make possible a more detailed reconstruction of the period Vesalius spent in the Nuovo Studio Pisano, carrying out public human dissections, discussing and refuting most of the Galenic doctrine.

  12. 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)

  13. Gian Piero Piretto, La vita privata degli oggetti sovietici. 25 storie da un altro mondo

    Directory of Open Access Journals (Sweden)

    Enza Dammiano

    2013-05-01

    Full Text Available Dopo aver analizzato le “mitologie culturali” dell’era sovietica – il “radioso avvenire” che queste proiettavano (Il radioso avvenire. Mitologie culturali sovietiche, Einaudi, 2001 – e ‘illustrato’, in particolare, gli anni Trenta e Quaranta attraverso Gli occhi di Stalin (Raffaello Cortina, 2010, con La vita privata degli oggetti sovietici Gian Piero Piretto introduce il lettore nelle “storie” di venticinque «cose sovietiche» (32, disseminate lungo l’intero arco temporale di esistenza dell’URSS e oltre: «La maggior parte delle cose a cui dedicherò la mia specifica attenzione ancora circola […], talora in forme rinnovate (degenerate o adattate alla nuova realtà» (43.

  14. 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...

  15. Assessment of proximal isovelocity surface area (PISA) shape using three-dimensional echocardiography in a paediatric population with mitral regurgitation or ventricular shunt.

    Science.gov (United States)

    Ziani, Abdelkader Boutaleb; Latcu, Decebal Gabriel; Abadir, Sylvia; Paranon, Soizic; Dulac, Yves; Guerrero, Felipe; Acar, Philippe

    2009-03-01

    The proximal isovelocity surface area (PISA) method is validated to quantify mitral regurgitation (MR) and ventricular shunt (VS). However, the two-dimensional echocardiography (2DE) PISA method assumes a hemispherical distribution of velocity factors proximal to the MR or VS orifice. To assess the PISA shape by three-dimensional echocardiography (3DE) in a paediatric population with MR or VS. According to the true PISA shape, we suggest different models to calculate the MR or VS volume by the 3DE PISA method. Thirty-one paediatric patients (aged 1month to 20years, median 69months) were included: 17 had MR and 14 had VS. The orifice area and volume of MR and VS were evaluated by 2DE. 3DE acquired the entire PISA volume at orifice level. The PISA shape was estimated according to three diameters as being hemispherical, prolate hemispheroid, oblate hemispheroid and hemiellipsoid. Data from 28patients were analysed. The PISA shape was variable: hemispherical, 11%; prolate hemispheroid, 43%; oblate hemispheroid, 32%; hemiellipsoid, 14%. Oblate hemispheroids occurred more frequently in the MR group (47%), whereas prolate hemispheroids occurred more frequently in the VS group (62%); hemispheres were scarce in both groups (10%). The mean MR or VS orifices and volumes measured by 2DE and 3DE were significantly different (0.123cm(2) versus 0.094cm(2) and 13.2mL versus 10.1mL, respectively; p=0.019). 3DE describes the true surface of the PISA shape. In a paediatric population with MR or VS, the PISA is rarely hemispherical but is more often prolate or oblate hemispheroid.

  16. 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…

  17. Mathematics Low Achievement in Greece: A Multilevel Analysis of the Programme for International Student Assessment (PISA) 2012 Data

    Science.gov (United States)

    Karakolidis, Anastasios; Pitsia, Vasiliki; Emvalotis, Anastassios

    2016-01-01

    The main aim of the present study was to carry out an in-depth examination of mathematics underperformance in Greece. By applying a binary multilevel model to the PISA 2012 data, this study investigated the factors which were linked to low achievement in mathematics. The multilevel analysis revealed that students' gender, immigration status,…

  18. Did the Shift to Computer-Based Testing in PISA 2015 Affect Reading Scores? A View from East Asia

    Science.gov (United States)

    Komatsu, Hikaru; Rappleye, Jeremy

    2017-01-01

    In this Forum article, Komatsu and Rappleye report that the results of PISA 2015 released December 2016 revealed a major oddity: reading scores in several of the "leading" East Asian countries had apparently plummeted. An interesting point is that Japan, Taiwan, Korea and Hong Kong are among the most advanced technological societies in…

  19. 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…

  20. 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

    respectively. IH-N.m.r. spectroscopy showed that the lactone rings involved position 9 of the inner sialic acid and position 2 of the inner...evolutionary pressures that led to these properties. 2/20/89, For San Miniato, 5/89. 55 -| ) (t I im a : , I! - ESR study of hydration, unsaturation and...and temperature variations, changes in surface curvature and lipid unsaturation turn out to have clear effect on the orientational order only. This

  1. 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...

  2. 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. .

  3. 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.

  4. Proximal isovelocity surface area (PISA) as a noninvasive method for the estimation of the shunt quantification in perimembranous ventricular septal defects.

    Science.gov (United States)

    Eren, M; Dagdeviren, B; Bolca, O; Polat, M; Gürlertop, Y; Norgaz, T; Tezel, T

    2001-02-01

    This study was designed to assess the reliability of the proximal isovelocity surface area (PISA) method for the estimation of shunt quantification in perimembranous ventricular septal defects (PVSD). The study group was composed of 30 patients (age 11 +/- 7 years, 13 female) with PVSD. The shunt flow (Qp-Qs) and the ratio of the pulmonary flow to the systemic flow (Qp/Qs) were calculated by spectral Doppler and catheterization. The Qp-Qs, the defect area (DA), and the shunt volume (SV) were obtained by the PISA method. The PISA method estimated the DA (cm(2)/m(2)), the SV (cm(3)/m(2)), and the Qp-Qs (L/min/m(2)) to be equal to (2 x pi x R(2) x NL)/(V(max) x Body surface area), DA x TVI(shunt), and to SV x Heart rate, respectively (R is the distance of the maximal PISA from the first aliasing line to the left ventricular side of the defect, NL is the nyquist limit, and V(max) and TVI(shunt) are the peak velocity and time-velocity integral of transdefect Doppler tracing obtained by continuous-wave Doppler). The PISA method (3.4 +/- 1.5 L/min/m(2)) underestimated the Qp-Qs according to spectral Doppler (r = 0.96, P PISA findings (Qp-Qs, DA, SV) and the catheterization Qp/Qs (r = 0.86, 0.84, and 0.86; P PISA findings in identifying large defects were high (0.90, 0.93, and 0.90 for cut-off values of Qp-Qs = 3.67 L/min/m(2), DA = 0.44 cm(2)/m(2), and SV = 43 cm(3)/m(2), respectively). As a result, the PISA method can be a simple and reliable alternative to the spectral Doppler method in the identification of large shunts in PVSD.

  5. 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.

  6. 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

  7. 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.

  8. Trif??sica: apuntes de electrotecnia para Grados de Ingenier??a

    OpenAIRE

    Rabaza Castillo, Ovidio

    2014-01-01

    El documento forma parte de los apuntes de clase y presentaciones de la asignatura de Electrotecnia en los Grados de Ingenier??a Civil, Ingenier??a Qu??mica e Ingenier??a Electr??nica Industrial impartidos en la Universidad de Granada.

  9. Monof??sica: apuntes de electrotecnia para Grados de Ingenier??a

    OpenAIRE

    Rabaza Castillo, Ovidio

    2014-01-01

    El documento forma parte de los apuntes de clase y presentaciones de la asignatura de Electrotecnia en los Grados de Ingenier??a Civil, Ingenier??a Qu??mica e Ingenier??a Electr??nica Industrial impartidos en la Universidad de Granada.

  10. 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

  11. Propuesta didáctica para la enseñanza de las proporciones en el grado séptimo de la institución educativa departamental San Miguel

    OpenAIRE

    Daza López, Juan Manuel

    2014-01-01

    En este trabajo se realiza una reflexión sobre el razonamiento proporcional y sus aplicaciones en diferentes contextos, tomando como base los aspectos disciplinares, didácticos e históricos-epistemológicos, con el fin de elaborar una propuesta didáctica para la enseñanza de las proporciones en el grado séptimo, que permita sugerir estrategias para superar la falta de transversalidad detectada en el área de matemáticas de la Institución Educativa Departamental San Miguel, ubicada en el municip...

  12. Adaptation of triple axis neutron spectrometer for SANS measurements using alumina samples at TRIGA reactor of Bangladesh

    Science.gov (United States)

    Ahmed, F. U.; Kamal, I.; Yunus, S. M.; Datta, T. K.; Azad, A. K.; Zakaria, A. K. M.; Goyal, P. S.

    2005-09-01

    Double crystal method known as Bonse and Hart's technique has been employed to develop small angle neutron scattering (SANS) facility on a triple axis neutron spectrometer at TRIGA Mark II (3 MW) research reactor of Atomic Energy Research Establishment (AERE), Savar, Dhaka, Bangladesh. Two Si(1 1 1) crystals with very small mosaic spread ∼1 min have been used for this purpose. At an incident neutron wavelength of 1.24 Å, this device is useful for SANS in the Q range between 1.6×10 -3 and 10 -1 Å -1. This Q range allows investigating particle sizes and interparticle correlations on a length scale of ∼200 Å. Results of SANS experiments on three alumina (Al 2O 3) samples as performed using above setup are presented. It is seen that Al 2O 3 particles, indeed, scatter neutrons in regions of small angles. It is also seen that scattering is different for different samples showing that it changes with a change in particle size.

  13. 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…

  14. What Russian High Schools Can Teach in a Year Based on PISA-2009: Reading Literacy

    OpenAIRE

    Yulia Tyumeneva; Yulia Kuzmina

    2013-01-01

    Yuliya Tyumeneva, Ph.D. in Psychology, senior researcher at the Center for Monitoring Educational Quality, National Research University - Higher School of Economics, Moscow, Russian Federation. Email: Yuliya Kuzmina, analyst at the Center for Monitoring Educational Quality, National Research University - Higher School of Economics, Moscow, Russian Federation. Email: This study uses PISA-2009 (reading) results to estimate effects of spending one year in schools ...

  15. 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…

  16. PISA as an Ideational Roadmap for Policy Change: Exploring Germany and England in a Comparative Perspective

    Science.gov (United States)

    Knodel, Philipp; Martens, Kerstin; Niemann, Dennis

    2013-01-01

    Education policy has undergone transformation in many countries over the last decade. In this article, we focus on the effects of the most significant international initiative in secondary education, which is the Organisation for Economic Co-operation and Development's (OECD) Programme for International Student Assessment (PISA). We analyse two…

  17. Influence of Holocene stratigraphic architecture on ground surface settlements: A case study from the City of Pisa (Tuscany, Italy)

    Science.gov (United States)

    Sarti, Giovanni; Rossi, Veronica; Amorosi, Alessandro

    2012-12-01

    The Holocene stratigraphic architecture of modern coastal and deltaic plains has peculiar characteristics that may influence ground surface settlements. In the Pisa urban area, the inhomogeneous spatial distribution of geotechnically weak layers, typically formed during the mid-late Holocene (highstand) coastal progradation, is inferred to be responsible for urban ground settlement and building damage, as evidenced by the tilt of several surface structures, among which the famous Leaning Tower of Pisa is the most prominent. On the basis of integrated stratigraphic, sedimentological and geotechnical data from a wide georeferenced database, three facies associations with high deformability potential (Units 1-3) are identified in the uppermost 30 m as opposed to depositional facies (Units 4-5) with higher geotechnical strength. Whereas Unit 1 represents a thick, laterally extensive lagoonal clay deposit, the overlying highly deformable units (Units 2-3) show more discontinuous spatial distribution controlled by the Holocene paleohydrographic evolution of the Arno coastal plain. Unit 2, dated between the Neolithic and the Etruscan age (ca. 5000-2000 yr BP), is composed of swamp clays and silty clays recording lagoon infilling due to Arno Delta progradation. Units 3 and 4, which consist of wet levee deposits and stiff floodplain clays, respectively, formed during the subsequent phases of alluvial plain construction started around the Roman age (from ca. 2000 yr BP). Whereas Units 3 and 4 are recorded within the uppermost 5 m, fluvial and distributary channel sands (Unit 5) cut the underlying deltaic-alluvial succession at various stratigraphic levels, down to Unit 1. The spatial distribution of these units gives rise to three, locally juxtaposed, stratigraphic motifs in Pisa underground, reflecting different potential risks for settlement under building loads. We show how lateral changes in stratigraphic architecture account for the irregular spatial distribution of

  18. Reversible Valproate Induced Pisa Syndrome and Parkinsonism in a Neuro-Oncology Patient with Depression and Epilepsy

    Directory of Open Access Journals (Sweden)

    Andrea Botturi

    2016-06-01

    Full Text Available Neurological and psychiatric conditions frequently overlap in neuro-oncology. This overlapping negatively affects patients’ quality of life and decreases the ability of providers to manage specific symptoms by therapy modulation, especially when psychopharmacotherapy needs to be prescribed. We describe here a patient with recurrent brain tumor, symptomatic epilepsy and depression who developed Pisa syndrome and parkinsonism after several months of valproic acid use. An accurate recognition of symptoms and treatment side effect allowed an appropriate clinical approach so as to rapidly improve both movement disorder and depression without increasing the risk of developing seizure. This has improved the autonomy and quality of life in a patient with poor prognosis.

  19. 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.

  20. DEL "CONSEJO DE EDUCACIÓN" A PISA: BREVE HISTORIA CONTEMPORÁNEA DE LA POLÍTICA EDUCATIVA ALEMANA

    Directory of Open Access Journals (Sweden)

    Achim Leschinsky

    2009-01-01

    Full Text Available El presente trabajo intenta abarcar el arco que va de la actual discusión acerca de los resultados de PISA a las tareas desarrolladas por el Consejo Alemán de Educación (Deutscher Bildungsrat en las décadas de 1960 y 1970. Al mismo tiempo, se buscará dar una mirada a la investigación realizada por la OCDE en la República Federal de Alemania años antes del relevamiento de PISA de 1999-2000. En el mencionado espacio temporal, se había instalado en Alemania la conciencia de que era de toda necesidad una reforma educativa. Fue esta la idea que promovió la fundación del Consejo de Educación, cuya misión era, ante todo, la de fomentar una reforma educativa a nivel fundamental. Por ello, cobra importancia aclarar las razones de la persistencia de la "miseria educativa" en Alemania y las causas que llevaron al fracaso de las propuestas del Consejo de Educación. Una razón de peso es la que se deja ver en la relación - hasta hoy conflictiva - entre las ciencias de la educación y la política alemanas.

  1. A COOLED NEUTRONIC REACTOR

    Science.gov (United States)

    Wigner, E.P.; Creutz, E.C.

    1960-03-15

    A nuclear reactor comprising a pair of graphite blocks separated by an air gap is described. Each of the blocks contains a plurality of channels extending from the gap through the block with a plurality of fuel elements being located in the channels. Means are provided for introducing air into the gap between the graphite blocks and for exhausting the air from the ends of the channels opposite the gap.

  2. Facing the Future: A Focus on Mathematical Literacy among Australian 15-Year-Old Students in PISA 2003

    Science.gov (United States)

    Thomson, Sue; Cresswell, John; De Bortoli, Lisa

    2004-01-01

    The Programme for International Student Assessment (PISA) is an initiative of the Organisation for Economic Co-operation and Development (OECD) in Paris. The overall aim of PISA is to measure how well 15-year-olds approaching the end of their compulsory schooling are prepared for meeting the challenges they will face in their lives beyond school.…

  3. Mapping an Experiment-Based Assessment of Collaborative Behavior onto Collaborative Problem Solving in PISA 2015: A Cluster Analysis Approach for Collaborator Profiles

    Science.gov (United States)

    Herborn, Katharina; Mustafic, Maida; Greiff, Samuel

    2017-01-01

    Collaborative problem solving (CPS) assessment is a new academic research field with a number of educational implications. In 2015, the Programme for International Student Assessment (PISA) assessed CPS with a computer-simulated human-agent (H-A) approach that claimed to measure 12 individual CPS skills for the first time. After reviewing the…

  4. Implications of PISA outcomes for science curriculum reform in the Netherlands

    NARCIS (Netherlands)

    Eijkelhof, H.M.C.; Kordes, J.H.; Savelsbergh, E.R.

    2013-01-01

    As the PISA 2006 results came out, the Netherlands brief y celebrated their 9th position in the overall country ranking for science. After that, interest in the PISA results rapidly declined. Nevertheless, there is sufficient reason to take a closer look at the PISA results, for instance because (a)

  5. An Overview of Reactor Concepts, a Survey of Reactor Designs.

    Science.gov (United States)

    1985-02-01

    implies, this reactor uses gas as the primary coolant . The coolant has a higher exit temperature when leaving the core than the PWR water 6 AFWL-TN-84...nuclear reactors, coolants must be used to ensure material components are not subject to failure due to the temperature exceeding melting points...Reactors that use deu- terium (heavy water) as a coolant can use natural uranium as a fuel. The * Canadian reactor, CANDU , utilizes this concept

  6. 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…

  7. Aula invertida: experiencia en el Grado de Enfermería

    OpenAIRE

    Sabater Mateu, Ma. Pilar; Curto, J. J. (Jorge Juan); Rourera, A. (Angela); Olivé Ferrer, M. Carmen; Costa Abos, Silvia; Castillo-Ibáñez, Sara; Del Pino Gutiérrez, Amparo

    2017-01-01

    En el aula invertida, los estudiantes trabajan autónomamente tareas previamente preparadas con este fin por el profesorado. Objetivo: evaluar el aula invertida como innovación docente y contrastar los resultados con grupo con docencia tradicional. Contexto: primer curso del Grado de Enfermería en la asignatura troncal Ciencias Psicosociales Aplicadas a la Salud (grupo C, n=81). Metodología: cualitativa y cuantitativa con la inclusión de instrumentos estandarizados ad hoc. Destaca la evaluació...

  8. "Bildungskrise"--PISA and the German Educational Crisis

    Science.gov (United States)

    Odendahl, Wolfgang

    2017-01-01

    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…

  9. PISA 2015 Results: Students' Well-Being. Volume III

    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. This report is the product of a collaborative effort between the countries participating in PISA, the national and international experts and institutions working within…

  10. Governing Schooling through "What Works": The OECD's PISA for Schools

    Science.gov (United States)

    Lewis, Steven

    2017-01-01

    This paper explores Programme for International Student Assessment (PISA) for Schools, a local variant of the Organisation for Economic Cooperation and Development (OECD's) influential PISA that not only assesses an individual school's performance in reading, mathematics and science against international schooling systems, but also promotes 17…

  11. Analysis of cross-cultural comparability of PISA 2009 scores

    NARCIS (Netherlands)

    Kankaras, M.; Moors, G.B.D.

    2014-01-01

    The Program for International Student Assessment (PISA) is a large-scale cross-national study that measures academic competencies of 15-year-old students in mathematics, reading, and science from more than 50 countries/economies around the world. PISA results are usually aggregated and presented in

  12. 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.

  13. Metodología de trabajo colaborativo en Acondicionamiento y Servicios del Grado en Arquitectura

    OpenAIRE

    González Avilés, Ángel Benigno; Pérez Millán, Isabel; Echarri Iribarren, Víctor

    2016-01-01

    Con esta comunicación se pretende mostrar la metodología de trabajo colaborativo entre las asignaturas de Acondicionamiento y Servicios 1 y 2 del Grado en Arquitectura. La coordinación de contenidos y una metodología común basada en el trabajo individual de proyectos reales con correcciones grupales ha provocado un mejor rendimiento entre los estudiantes con un alza generalizada en sus calificaciones. Los estudiantes han trabajado sobre un caso práctico real, conocido y publicado en revistas ...

  14. Competencias emocionales en estudiantes del Grado en Criminología

    OpenAIRE

    Albaladejo-Blázquez, Natalia; Sánchez San Segundo, Miriam; Fernández-Pascual, M. Dolores; Santos-Ruiz, Ana; Díez Jorro, Miguel; Asensi Pérez, Laura Fátima

    2014-01-01

    La adquisición de competencias profesionales es un objetivo prioritario dentro del marco del Espacio Europeo de Educación Superior. El abordaje de la inteligencia emocional en el profesional en Criminología es importante, ya que en el desempeño de sus funciones requiere de una elevada fortaleza emocional. En este sentido, la competencia emocional que el estudiante del Grado en Criminología adquiera en su proceso de enseñanza-aprendizaje es un elemento clave en su futura práctica profesional. ...

  15. The PISA View of Mathematical Literacy in Indonesia

    Directory of Open Access Journals (Sweden)

    Kaye Stacey

    2011-07-01

    Full Text Available PISA, the OECD’s international program of assessment of reading,scientific and mathematical literacy (www.oecd.org/pisa, aims toassess the ability of 15 year olds to use the knowledge and skills that have acquired at school in real world tasks and challenges. It also uses questionnaires to gather data on students’ attitudes to learning and the conditions of schooling. Since 2000, PISA has tested the mathematical literacy of 15 year old students from many countries around the world. This paper describes the design of the PISA assessments, discusses mathematical literacy and reports on a selection of results from the PISA assessments, associated surveys and related analyses to give a flavour of the information that has resulted from this major international initiative. Results for Indonesia are compared with the OECD average and with a selection of countries, addressing issues of overall achievement, equity, and classroom environment.

  16. 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.

  17. 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.

  18. Tres estilos docentes en la “Introducción a las finanzas” en el grado de Turismo de la Universidad de Sevilla

    OpenAIRE

    Amador Tobaja, Alberto; Caballero Soria, Silvia; Molleda Jimena, Guillermo; Jiménez Caballero, José Luis (Coordinador)

    2015-01-01

    La asignatura “Introducción a las Finanzas” que se imparte en el grado de Turismo es la misma que se imparte en otros grados afines en el mismo curso (primer año de carrera), a saber: Administración y Dirección de Empresas (ADE), Finanzas y Contabilidad (FICO), Economía, Marketing y los dobles grados de ADE y Derecho, FICO y Relaciones Laborales, y FICO y Derecho. El objetivo de los métodos de enseñanza puestos en marcha en la asignatura “Introducción a las Finanzas” en el grado de Turismo es...

  19. Adaptación de la asignatura "Parasitología" al grado de Farmacia: prácticas

    OpenAIRE

    López Abán, Julio; Muro-Álvarez, Antonio; Encinas Grandes, Antonio Luis; Simón Martín, Fernando; Morchón García, Rodrigo

    2010-01-01

    La asignatura de Parasitología aparece en tercer curso del Grado en Farmacia. Actualmente disponemos de nuevos recursos didácticos que nos permiten trabajar más fácilmente con los estudiantes. En el proyecto nos hemos adaptar los contenidos de parasitología para afrontar la adaptación al Grado en Farmacia de modo que se optimizaran los recursos y el esfuerzo de los profesores. También se ha digitalizado material destinado a las prácticas y se ha puesto en un formato apropiado para ser utiliz...

  20. 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

  1. Diseño de actividades para la evaluación vertical y horizontal de competencias en los grados de Biología y Ciencias Ambientales

    OpenAIRE

    Rubio Valverde, Lourdes; Carmona Fernández, Raquel; Moreno Ostos, Enrique; Altamirano Jeschke, María; Fernández García, José Antonio

    2015-01-01

    En el presente trabajo se muestra el diseño de actividades para la evaluación de competencias en algunas asignaturas de los Grados de Biología y Ciencias Ambientales de la Universidad de Málaga. En concreto se han diseñado herramientas de evaluación transversales para determinar el grado de adquisición de competencias en asignaturas relacionadas verticalmente en el Grado de Biología y horizontalmente en el Grado de Ciencias Ambientales. El trabajo muestra un catálogo de competencias comunes e...

  2. 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...

  3. The Many Facets of PISA

    Science.gov (United States)

    Berliner, David C.

    2015-01-01

    Trying to understand PISA is analogous to the parable of the blind men and the elephant. There are many facets of the PISA program, and thus many ways to both applaud and critique this ambitious international program of assessment that has gained enormous importance in the crafting of contemporary educational policy. One of the facets discussed in…

  4. Botulinum toxin type A potentiates the effect of neuromotor rehabilitation of Pisa syndrome in Parkinson disease: a placebo controlled study.

    Science.gov (United States)

    Tassorelli, C; De Icco, R; Alfonsi, E; Bartolo, M; Serrao, M; Avenali, M; De Paoli, I; Conte, C; Pozzi, N G; Bramanti, P; Nappi, G; Sandrini, G

    2014-11-01

    Pisa syndrome (PS) is a tonic lateral flexion of trunk that represents a disabling complication of advanced Parkinson disease (PD). Conventional rehabilitation treatment (CT) ameliorates axial posture and trunk mobility in PD patients, but the improvement tends to wane in 4-6 months. Botulin toxin (BT) may reduce muscle hyperactivity, therefore improving CT effectiveness. We evaluated whether the injection of incabotulinum toxin type A (iBTA) into the hyperactive trunk muscles might improve the effectiveness of rehabilitation in a group of PD patients with PS. Twenty-six PD patients were enrolled in a randomized placebo-controlled trial. Group A was treated with iBTA before undergoing CT (a 4-week intensive programme), while Group B received saline before the 4-week CT treatment. Patients were evaluated at baseline, at the end of the rehabilitative period, 3 and 6 months with kinematic analysis of movement, UPDRS, Functional Independence Measure and Visual Analog Scale for pain. At the end of the rehabilitation period, both groups improved significantly in terms of static postural alignment and of range of motion. Group A showed a significantly more marked reduction in pain score as compared with Group B and a more prolonged efficacy on several clinical and kinematic variables. Our preliminary data suggest that BT may be considered an important addition to the rehabilitation programme for PD subjects with PS for improving axial posture and trunk mobility, as well as for a better control of pain. Copyright © 2014 Elsevier Ltd. All rights reserved.

  5. 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.

  6. Propuesta metodológica para evaluar el grado de Caminabilidad en las ciudades. Aplicación a Dubai

    OpenAIRE

    Imaz Castro, Íñigo

    2017-01-01

    El objeto del trabajo consiste en proponer una metodología que sirva para evaluar el grado de caminabilidad de una ciudad, con el objetivo de poder comparar distintas ciudades, y a partir de ahí, actuar para mejorar las condiciones de los peatones.

  7. 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.

  8. Reactor Physics Analysis Models for a CANDU Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Hang Bok

    2007-10-15

    Canada deuterium uranium (CANDU) reactor physics analysis is typically performed in three steps. At first, macroscopic cross-sections of the reference lattice is produced by modeling the reference fuel channel. Secondly macroscopic cross-sections of reactivity devices in the reactor are generated. The macroscopic cross-sections of a reactivity device are calculated as incremental cross-sections by subtracting macroscopic cross-sections of a three-dimensional lattice without reactivity device from those of a three-dimensional lattice with a reactivity device. Using the macroscopic cross-sections of the reference lattice and incremental cross-sections of the reactivity devices, reactor physics calculations are performed. This report summarizes input data of typical CANDU reactor physics codes, which can be utilized for the future CANDU reactor physics analysis.

  9. 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

  10. Wisconsin High Schools Learn from New PISA Test

    National Research Council Canada - National Science Library

    Alan J Borsuk

    2015-01-01

      The vehicle is the OECD Test for Schools, a small but growing program in which samples of 15-year-old students at selected schools take a version of the Program for International Student Assessment (PISA...

  11. Eesti PISA 2009 kontekstis: tugevused ja probleemid (PISA) / Jaan Mikk

    Index Scriptorium Estoniae

    Mikk, Jaan, 1939-

    2014-01-01

    Ülevaade Eduko programmi finantseeritud Tartu Ülikooli uuringust, mille eesmärgiks oli analüüsida Eesti koolide tugevusi ja probleeme PISA 2009 tulemuste põhjal ning leida teid Eesti hariduse arendamiseks

  12. 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.

  13. Pisa syndrome in Parkinson's disease: diagnostic and management challenges

    Directory of Open Access Journals (Sweden)

    Miletić V

    2016-04-01

    Full Text Available Vladimir Miletić Department of Neurology, Movement Disorders Centre, University Hospital Centre Zagreb, Zagreb, Croatia Abstract: Pisa syndrome is a rare clinical entity characterized by marked lateral flexion of the trunk, which is typically mobile and resolves at supine position. When observed in clinical practice, it denotes an incapacitating symptom of underlying neurodegenerative disease such as Parkinson's disease, multiple system atrophy, and Alzheimer's disease. The underlying pathophysiological mechanisms responsible for the development of Pisa syndrome are poorly understood, and its management remains a challenge. In this review, we will focus our attention on Pisa syndrome in patients with Parkinson's disease, and provide an update on prevalence, pathophysiology, clinical manifestation, and treatment options. Keywords: Pisa syndrome, lateral trunk flexion, Parkinson's disease

  14. El Trabajo fin de Grado en Enfermería: conocimientos integrados y aprendizaje guiado

    Directory of Open Access Journals (Sweden)

    Marta Rodrígurez García

    2015-12-01

    Full Text Available El Trabajo fin de Grado (TFG en Enfermería de la Universidad Europea (Madrid es un trabajo orientado al mundo profesional, integrador y potenciador de los conocimientos adquiridos durante la titulación. Las características que definen su planteamiento son: formato semi-presencial, el estudiante escoge el tema guiado por un profesor-tutor, que es mentor del estudiante y le acompaña hasta finalizarlo. Todas las actividades se realizan a través de una plataforma virtual. El planteamiento y desarrollo del TFG se considera una "buena práctica" de departamento por los resultados alcanzados, según los estudiantes en cuanto a calidad de las asignaturas y del profesorado (4,5 sobre 5, y en la encuesta de satisfacción con el mentor (4,26 sobre 5, respecto a 27 profesores. Los estudiantes reconstruyen, desde un enfoque de transversalidad, el conjunto de conocimientos y habilidades, que les sitúa en las problemáticas actuales, les proyecta hacia el futuro profesional y les invita a continuar sus estudios.

  15. Grados de autonomía: notas sobre la situación externa latinoamericana

    Directory of Open Access Journals (Sweden)

    Francisco Cantamutto

    2013-01-01

    Full Text Available Resumen:  En  diversas  publicaciones  recientes  se  puede  constatar  la  mejoría  en la  situación macroeconómica latinoamericana durante la última década, adjudicando parte de este logro a la situación externa. La evaluación cepalina es muy prometedora en este sentido, hablando de mayores grados de libertad para la intervención estatal sobre los mercados. Nuestra intención es relativizar esta conclusión, específicamente en relación a la situación externa: en la región aún persisten fragilidades estructurales importantes. Evaluaremos aquí el impacto de las mejoras inducidas desde el comercio internacional sobre la situación de endeudamiento y, más en general, de los flujos de financiamiento. Analizaremos estas relaciones para América Latina y Caribe como región agregada, y además para cuatro países que se han presentado como orientados hacia una mayor autonomía política nacional: Argentina, Bolivia, Ecuador y Venezuela.   Palabras clave: América Latina, Deuda externa, Balanza Comercial, Desarrollo Económico

  16. Evaluación de ansiedad y depresión en estudiantes de primero de Grado en Psicología y Grado en Terapia Ocupacional

    OpenAIRE

    Fuentes Pérez, Paloma

    2015-01-01

    Trabajo Fin de Grado, curso 2014-2015 [ES]Numerosos estudios ponen de manifiesto que la ansiedad y la depresión constituyen importantes problemas de salud en la actualidad. Específicamente, en el contexto universitario, diversas investigaciones señalan que existe una alta tasa de trastornos ansiosos y depresivos en esta franja de edad. Así pues, el presente trabajo tiene como objetivos investigar la existencia de posibles diferencias en las puntuaciones de ansiedad y depresión atendien...

  17. 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

  18. Guía teórico-práctica de Variable Compleja para estudios de Grado

    OpenAIRE

    Galindo Soto, Félix; Tristán Vega, Luis Alberto; Sanz Gil, Javier; Gómez Pérez, Javier; Lastra Sedano, Alberto; Jímenez Garrido, Jesús Javier

    2015-01-01

    Guía dedicada fundamentalmente a la resolución de problemas de Variable Compleja. Dirigido a los alumnos de Grado, pretende poner al alcance del alumno el dominio de los métodos y técnicas básicos necesarios para abordar y resolver aquellas cuestiones que se le presenten relacionadas con la materia citada anteriormente. Departamento de Análisis Matemático y Didáctica Matemática

  19. Gian Piero Piretto, La vita privata degli oggetti sovietici. 25 storie da un altro mondo

    OpenAIRE

    Enza Dammiano

    2013-01-01

    Dopo aver analizzato le “mitologie culturali” dell’era sovietica – il “radioso avvenire” che queste proiettavano (Il radioso avvenire. Mitologie culturali sovietiche, Einaudi, 2001) – e ‘illustrato’, in particolare, gli anni Trenta e Quaranta attraverso Gli occhi di Stalin (Raffaello Cortina, 2010), con La vita privata degli oggetti sovietici Gian Piero Piretto introduce il lettore nelle “storie” di venticinque «cose sovi...

  20. STARFIRE: a commercial tokamak reactor

    Energy Technology Data Exchange (ETDEWEB)

    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.

  1. Una Visita al Viejo San Juan (A Visit to Old San Juan).

    Science.gov (United States)

    Cabello, Victor; And Others

    Written in Spanish, this black and white illustrated booklet provides a tour of Old San Juan, Puerto Rico's oldest and most historic city. Brief historical information is provided on the Perro de San Jeronimo, a statue of a barking dog found in front of the Castillo; Plaza de Colon, a small plaza dedicated to Christopher Columbus; the Catedral de…

  2. Placing PISA and PISA for Schools in Two Federalisms, Australia and the USA

    Science.gov (United States)

    Lingard, Bob; Lewis, Steven

    2017-01-01

    This paper accepts that the OECD's PISA has become influential in policy terms globally, but analyses the ways that the main PISA and PISA for Schools tests are positioned differently in Australia and the USA because of contrasting educational federalisms in the two nations. Our argument is that while PISA is undoubtedly influential, its effects…

  3. Desde el atractivo poder de los datos de PISA a las desilusiones del benchmarking. ¿Desafío a la evaluación de los sistemas educativos?

    Directory of Open Access Journals (Sweden)

    Marie Duru-Bellat

    2013-01-01

    Full Text Available El objetivo de este artículo es mostrar y examinar el papel que pueden jugar los datos que aporta PISA en un marco más amplio relacionado con la evaluación de la calidad de los sistemas educativos. Para ello, algunas de las críticas y la resistencia dirigida a los datos ofrecidos por PISA en realidad tienen que ver con su mal uso en el proceso de la evaluación comparativa, así como, de una forma más amplia, con la evaluación de los sistemas educativos.

  4. Guía para la elaboración de trabajos científicos: grado, máster y postgrado [Páginas resumen

    OpenAIRE

    Mirón-Canelo, José Antonio; Alonso-Sardón, Montserrat; Iglesias de Sena, Helena; Lorenzo Gómez, María Fernanda; Marcos Martín, Miguel; Martín Rodero, Helena; Alonso-Arévalo, Julio; Fernández Martín, Luz Celia; Montero Martín, Javier; Albaladejo Martínez, Alberto; Rodríguez-Conde, María José; Montejo Maillo, Beatriz; Chamorro Fernández, Antonio Javier

    2013-01-01

    [ES]Esta Guía se ha realizado con el objetivo de ofrecer información relevante, concisa y precisa sobre los elementos y procedimientos básicos para la elaboración rigurosa y científica de los trabajos que hay que realizar en el Grado (Trabajo Fin de Grado) y en Post-Grado (Trabajo Fin de Máster y Tesis Doctoral)por parte de los discentes y/o profesionales de Ciencias de la Salud, Ciencias Sociales y afines. Toda la información introducida en esta Guía es fruto de la experiencia docente (c...

  5. Synthesis of SAN-PB-SAN triblock copolymers via a ''living'' copolymerization with macro-photoiniferters

    NARCIS (Netherlands)

    Kroeze, E; de Boer, B.; ten Brinke, G.; Hadziioannou, G

    1996-01-01

    A technique is described for the synthesis of poly((styrene-co-acrylonitrile)-block-butadiene-block-(styrene-co-acrylonitrile)) (SAN-PB-SAN) triblock copolymers through polybutadiene-based photo-iniferters. Dihydroxy- and dicarboxy-terminated polybutadienes were transformed into the

  6. Digital computer operation of a nuclear reactor

    Science.gov (United States)

    Colley, R.W.

    1982-06-29

    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.

  7. Grado de adherencia al protocolo de registros clínicos de enfermería

    Directory of Open Access Journals (Sweden)

    Luz Marina Bautista Rodríguez

    2016-01-01

    Full Text Available Introducción: La utilización de las guías de manejo clínicas, protocolos y manuales se constituyen en un elemento fundamental para la prestación de servicios de salud con calidad. El protocolo de registros clínicos es una herramienta que orienta al personal de enfermería en los lineamientos claves que se deben tener en cuenta en cada uno de los cuidados que se brindan.  Materiales y Métodos: Se realizó un estudio cuantitativo de tipo descriptivo de corte transversal. La muestra estuvo conformada por 105 auxiliares de enfermería y 15 profesionales de enfermería que laboran en una  institución de salud de IV nivel  de complejidad, para la recolección de la información se utilizó una lista de chequeo y un test de conocimientos basado en el protocolo de registros de la institución. Resultados: El nivel de conocimientos del personal profesional y auxiliar de enfermería sobre el protocolo es bueno con un 61%, le sigue un nivel de conocimientos regular con 29%. La aplicabilidad es buena en un 14% y un 54% del personal  profesional y auxiliar de enfermería tiene mala aplicabilidad al protocolo, encontrándose que no se diligencian completamente los formatos que se incluyen en la historia clínica. El nivel de adherencia es bueno para el 30% del personal profesional y auxiliar de enfermería. Discusión y Conclusiones: Se encontró que el personal profesional y auxiliar de enfermería tienen un buen nivel conocimientos solo en los registros clínicos que usan frecuentemente; sin embargo el personal profesional y auxiliar de enfermería  no aplican estos conocimientos en su práctica diaria, evidenciado por un 54% de mala aplicabilidad. Cómo citar este artículo: Bautista LM, Vejar LY, Pabón MR, Moreno JJ, Fuentes L, León KY, et al. Grado de adherencia al protocolo de registros clínicos de enfermería. Rev Cuid. 2016; 7(1: 1195-203. http://dx.doi.org/10.15649/cuidarte.v7i1.237

  8. Competencias y contenidos comunes de salud pública en los programas universitarios de grado: fisioterapia, terapia ocupacional, ciencias ambientales, odontología y veterinaria

    Directory of Open Access Journals (Sweden)

    M. Carmen Davó-Blanes

    2014-03-01

    Conclusiones: Se han identificado competencias y contenidos de salud pública comunes a los distintos grados estudiados que pueden servir de punto de partida para iniciar una revisión más detallada de los programas de salud pública en los diferentes grados, y alcanzar un consenso sobre los contenidos comunes que debería incluir cada uno de ellos

  9. Hydrodynamics of a Monolithic Stirrer Reactor

    NARCIS (Netherlands)

    Kritzinger, H.P.

    2011-01-01

    The Monolithic Stirrer Reactor (MSR) is a novel concept for heterogeneously catalyzed reactors and is presented as an alternative device to slurry reactors. It uses a modified stirrer on which structured catalyst supports (monoliths) are fixed to form permeable blades. The monoliths consist of small

  10. 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.

  11. Memoria de la red de coordinación del tercer curso del grado en Ingeniería Multimedia

    OpenAIRE

    Iñesta Quereda, José Manuel; Luján Mora, Sergio; Sanchez-Romero, Jose-Luis; Meliá, Santiago; Puchol García, Juan Antonio; Vicent, Jose F.; Montoyo-Bojo, Javier; Torres, Fernando; Aznar Gregori, Fidel; Vicedo, Jose-Luis

    2015-01-01

    Durante el presente curso se ha constatado el asentamiento del tercer curso del grado en Ingeniería Multimedia, lo que se deriva de los informes de seguimiento de las asignaturas del curso que, en su gran mayoría, no han destacado problema alguno (con alguna excepción de la que se informa). Por otro lado, se ha llevado a cabo una iniciativa para contrastar si las dependencias entre las asignaturas de tercero con respecto a sus precedentes en el plan de estudios responden en realidad a los pla...

  12. 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.

  13. 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.

  14. Shutdown system for a nuclear reactor

    Science.gov (United States)

    Groh, E.F.; Olson, A.P.; Wade, D.C.; Robinson, B.W.

    1984-06-05

    An ultimate shutdown system is provided for termination of neutronic activity in a nuclear reactor. The shutdown system includes bead chains comprising spherical containers suspended on a flexible cable. The containers are comprised of mating hemispherical shells which provide a ruggedized enclosure for reactor poison material. The bead chains, normally suspended above the reactor core on storage spools, are released for downward travel upon command from an external reactor monitor. The chains are capable of horizontal movement, so as to flow around obstructions in the reactor during their downward motion. 8 figs.

  15. 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…

  16. Cuestionarios conceptuales en primer curso de grados en Ingeniería como herramienta de investigación educativa

    OpenAIRE

    Alconchel Pecino, Francisco; Cámara Moral, María Encarnación; Casquel del Campo, Rafael; Gámez Mejías, Berta; Gámez Mejías, María de Linarejos; Lavín Hueros, Álvaro; Martín Blanquer, Pilar; Seidel Gómez de Quero, Luis

    2015-01-01

    En este trabajo presentamos los resultados de la administración del cuestionario conceptual FCI (Force Concept Inventory) a alumnos de primer curso de Grados en Ingeniería de la Universidad Politécnica de Madrid. Hemos utilizado el cuestionario conceptual como una herramienta de investigación educativa orientada a identificar fortalezas y debilidades en el perfil de entrada de los alumnos y en los resultados de aprendizaje de la asignatura de Física General I. Los resultados obtenidos, además...

  17. Un estudio en RED: Guía observacional en el Prácticum Grados Infantil y Primaria

    OpenAIRE

    Lledó Carreres, Asunción; Perandones González, Teresa María; Lorenzo, Gonzalo; Fernández López, Fernando Javier; Roig-Vila, Rosabel; Herrera Torres, Lucía; Gómez Barreto, Isabel; Blasco Mira, Josefa Eugenia; Sogorb Devesa, Luisa María; Navarro Busquier, Ana

    2015-01-01

    El trabajo que se presenta está enmarcado en la RED Diseño y desarrollo de una Guía observacional para la implementación del Prácticum de los Grados de Infantil y Primaria, dentro del Programa de REDES de investigación en docencia universitaria del ICE/ Universidad de Alicante. Tomando como referencia las competencias de la asignatura Prácticum que se desarrolla a lo largo de varios periodos, se han establecido una serie de indicadores de observación a nivel de centro y de aula, que nos permi...

  18. Desarrollo competencias laborales y formación de los profesionales en turismo, en la Universidad Nacional Mayor de San Marcos - año 2013

    OpenAIRE

    Granados Maguiño, Mauro Amaru

    2013-01-01

    La investigación titulada: El desarrollo competencias laborales y la formación de los profesionales en turismo, en la Universidad Nacional Mayor de San Marcos- Año 2013”, ha tenido como Objetivo “Determinar la relación entre el desarrollo de las competencias laborales y la formación de los profesionales en Turismo, en la Universidad Nacional Mayor de San Marcos, en el año 2013”, ha sido desarrollada para optar el Grado Académico de Doctor en Educación en la Escuela de Postgrado de la Universi...

  19. 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.

  20. Explaining the Difference between PISA 2009 Reading Scores in Finland and Estonia

    Science.gov (United States)

    Mikk, Jaan

    2015-01-01

    The aim of the study was to explain the difference between the Programme for International Student Assessment (PISA) 2009 reading results for Finland and Estonia using characteristics of teaching and learning, and characteristics of the overall development of these countries. PISA data were collected via a reading test and student questionnaires…

  1. Assessing Seventh Graders' Mathematical Literacy in Solving PISA-Like Tasks

    Science.gov (United States)

    Dewantara, Andi Harpeni; Zulkardi; Darmawijoyo

    2015-01-01

    This design research type development study aims at producing a set of PISA-like mathematics task which is valid and practical as well as has the potential effects. Then, activation of fundamental mathematical capabilities underlying mathematical process related to the mathematical literacy as the main potential effect of the developed PISA-like…

  2. 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

  3. 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

  4. Emergent Properties of Giant Vesicles Formed by a Polymerization-Induced Self-Assembly (PISA) Reaction

    Science.gov (United States)

    Albertsen, Anders N.; Szymański, Jan K.; Pérez-Mercader, Juan

    2017-01-01

    Giant micrometer sized vesicles are of obvious interest to the natural sciences as well as engineering, having potential application in fields ranging from drug delivery to synthetic biology. Their formation often requires elaborate experimental techniques and attempts to obtain giant vesicles from chemical media in a one-pot fashion have so far led to much smaller nanoscale structures. Here we show that a tailored medium undergoing controlled radical polymerization is capable of forming giant polymer vesicles. Using a protocol which allows for an aqueous reaction under mild conditions, we observe the macroscale consequences of amphiphilic polymer synthesis and the resulting molecular self-assembly using fluorescence microscopy. The polymerization process is photoinitiated by blue light granting complete control of the reaction, including on the microscope stage. The self-assembly process leads to giant vesicles with radii larger than 10 microns, exhibiting several emergent properties, including periodic growth and collapse as well as phototaxis.

  5. El concepto de tiempo en niños y niñas de primer a sexto grado

    Directory of Open Access Journals (Sweden)

    Ana Teresa León

    2011-01-01

    Full Text Available En este artículo resumo los resultados de mi tesis doctoral sobre el tema de la construcción del concepto tiempo en niños y niñas de 1° agrado de la educación general básica, particularmente desde el aprendizaje que se da de éste en los Estudios Sociales en Costa Rica. Utilicé en el estudio un diseño mixto; en este caso, reporto solamente los resultados del componente cuantitativo y la aplicación de un cuestionario con 148 niños y niñas. Encontré que se da un dominio creciente de los diversos componentes del concepto tiempo conforme se avanza en el sistema educativo, pero que el dominio depende más de las experiencias que de los aprendizajes formales, y que aún en 6to grado muchos niños y niñas tienen dificultades con nociones básicas del concepto.

  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. Cirugía de 360º en el tratamiento de la espondilolistesis lumbosacra de alto grado: técnica por única vía posterior

    OpenAIRE

    Díaz,Salvador Mattar; Ojeda,David Nicolás Esmeral; Payamps,Francisco Basora

    2012-01-01

    OBJETIVO: El tratamiento de las espondilolistesis lumbosacras de altos grados (IV y espondiloptosis) incluye la reducción del desplazamiento si es posible, descompresión, y la fijación y artrodesis del segmento afectado. Esta patología provoca un grado de incapacidad grave en los pacientes así como deformidad en su postura lumbosacra, llevándolos a adoptar una marcha anodina, acompañada de retracción de isquiotibiales de forma crónica. Con el fin de ofrecer una mejoría clínica, reducir el tie...

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

    Energy Technology Data Exchange (ETDEWEB)

    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/sub 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.

  9. Performance of a multipurpose research electrochemical reactor

    Energy Technology Data Exchange (ETDEWEB)

    Henquin, E.R. [Programa de Electroquimica Aplicada e Ingenieria Electroquimica (PRELINE), Facultad de Ingenieria Quimica, Universidad Nacional del Litoral, Santiago del Estero 2829, S3000AOM Santa Fe (Argentina); Bisang, J.M., E-mail: jbisang@fiq.unl.edu.ar [Programa de Electroquimica Aplicada e Ingenieria Electroquimica (PRELINE), Facultad de Ingenieria Quimica, Universidad Nacional del Litoral, Santiago del Estero 2829, S3000AOM Santa Fe (Argentina)

    2011-07-01

    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.

  10. Fuel handling apparatus for a nuclear reactor

    Science.gov (United States)

    Hawke, Basil C.

    1987-01-01

    Fuel handling apparatus for transporting fuel elements into and out of a nuclear reactor and transporting them within the reactor vessel extends through a penetration in the side of the reactor vessel. A lateral transport device carries the fuel elements laterally within the vessel and through the opening in the side of the vessel, and a reversible lifting device raises and lowers the fuel elements. In the preferred embodiment, the lifting device is supported by a pair of pivot arms.

  11. Profiling a reactor component using ultrasonics

    Energy Technology Data Exchange (ETDEWEB)

    Pathak, L.; Seshadri, V.R.; Kumaravadivelu, C.; Sreenivasan, G.; Raghunathan, V.S. [Indira Gandhi Centre for Atomic Research, Kalpakkam (India)

    1995-04-01

    Nuclear reactors have many components within the reactor vessel. During the life of a reactor it is possible for these components to be displaced or deformed because of the thermal cycles to which they are subject. Also, these components in situ therefore becomes important for the upkeep of the reactor. However, high radiation levels make it difficult to monitor using optical methods. This paper describes an ultrasonic method which was successfully employed in profiling a deformed guide tube of a reactor. The method uses the well-known ultrasonic ranging technique. However, the specialty of the method is the use of air transducers at 40 kHz to overcome the inherent divergence problems and the difficulties associated with high temperatures inherent in a sodium cooled reactor.

  12. 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.

  13. SUPERHEATING IN A BOILING WATER REACTOR

    Science.gov (United States)

    Treshow, M.

    1960-05-31

    A boiling-water reactor is described in which the steam developed in the reactor is superheated in the reactor. This is accomplished by providing means for separating the steam from the water and passing the steam over a surface of the fissionable material which is not in contact with the water. Specifically water is boiled on the outside of tubular fuel elements and the steam is superheated on the inside of the fuel elements.

  14. 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.

  15. NEUTRON DENSITY CONTROL IN A NEUTRONIC REACTOR

    Science.gov (United States)

    Young, G.J.

    1959-06-30

    The method and means for controlling the neutron density in a nuclear reactor is described. It describes the method and means for flattening the neutron density distribution curve across the reactor by spacing the absorbing control members to varying depths in the central region closer to the center than to the periphery of the active portion of the reactor to provide a smaller neutron reproduction ratio in the region wherein the members are inserted, than in the remainder of the reactor thereby increasing the over-all potential power output.

  16. 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....

  17. PISA: FUNDAMENTAÇÕES PARA PARTICIPAR E ACOLHIMENTO POLÍTICO

    Directory of Open Access Journals (Sweden)

    Bob Lingard

    Full Text Available RESUMO: Levando em consideração o trabalho da Organização para a Cooperação e o Desenvolvimento Econômico (OCDE na educação e o lugar transformador que o Programa Internacional de Avaliação de Alunos (Pisa ocupa nela, o presente artigo analisa a fundamentação da OCDE para o PISA. Para tal, abordam-se as estratégias de comunicação, a educação da OCDE e as habilidades que a Diretoria utiliza para administrar a mensagem do PISA. O documento também descreve as várias fundamentações que as nações empregam para participar no PISA. Os usos que são feitos do PISA no contexto nacional envolvem mais frequentemente a externalização do que a aprendizagem política, sendo os resultados comparativos do PISA aplicados para legitimar reformas políticas geralmente desconectadas das políticas de países com melhor desempenho no teste. O artigo apresenta três casos de tal externalização, levando-se em conta as respostas dadas nos Estados Unidos, na Inglaterra e na Austrália ao excelente desempenho de Xangai, China, na prova do PISA de 2009.

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

    OpenAIRE

    Dora Caridad Peña-Infante; Falconeri Lahera-Martínez; Yolanda Cruz Proenza-Garrido

    2013-01-01

    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 di...

  19. La urbanística y la ordenación del territorio en los grados y másteres de arquitectura e ingeniería

    OpenAIRE

    Martí Ciriquián, Pablo

    2016-01-01

    La implantación de todas las asignaturas del área de Urbanística y Ordenación del Territorio el próximo curso 2015-16 en la Universidad de Alicante plantea la elaboración de una estrategia conjunta en la que se aúnen los objetivos docente del área de conocimiento así como de las distintas titulaciones en la que se imparten contenidos. Por un lado, las titulaciones en las que se imparte abarca los dos niveles de formativos: un primer nivel de Grado los Grado incluye las titulaciones de Arquite...

  20. 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

  1. 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.

  2. Reflexiones sobre la autoevaluación del estudiante en el Grado en Enfermería

    OpenAIRE

    Vizcaya-Moreno, Maria Flores; Pérez-Cañaveras, Rosa M.; Jiménez-Ruiz, Ismael; Núñez del Castillo, María Mercedes; Hernández Ortuño, Antonio; Berlanga Fernández, Sofía; Juan, Alba de; Jurado Moyano, José Luis; Corral-Noguera, Ana Belén; Pérez Cañaveras, Alba

    2016-01-01

    En el marco europeo de educación superior ha recobrado interés la aplicación de sistemas como la autoevaluación del estudiante. Reflexionar sobre la formación de los estudiantes en autoevaluación, y su consideración o no en la calificación final, han sido temas de estudio en el ámbito de las ciencias de la salud. En el plan de estudios del Grado en Enfermería de la Universidad de Alicante, la autoevaluación del estudiante forma parte en el sistema general de evaluación con una ponderación var...

  3. 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.

  4. The Design of a Nuclear Reactor

    Indian Academy of Sciences (India)

    IAS Admin

    The aim of this largely pedagogical article is to employ pre-college physics to arrive at an un- derstanding of a system as complex as a nuclear reactor. We focus on three key issues: the fuel pin, the moderator, and lastly the dimensions of the nuclear reactor. 1. Introduction. Design considerations have engaged human ...

  5. Cooling system for a nuclear reactor

    Science.gov (United States)

    Amtmann, Hans H.

    1982-01-01

    A cooling system for a gas-cooled nuclear reactor is disclosed which includes at least one primary cooling loop adapted to pass coolant gas from the reactor core and an associated steam generator through a duct system having a main circulator therein, and at least one auxiliary cooling loop having communication with the reactor core and adapted to selectively pass coolant gas through an auxiliary heat exchanger and circulator. The main and auxiliary circulators are installed in a common vertical cavity in the reactor vessel, and a common return duct communicates with the reactor core and intersects the common cavity at a junction at which is located a flow diverter valve operative to effect coolant flow through either the primary or auxiliary cooling loops.

  6. 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.

  7. Correlación entre bibliografía obligatoria de los cursos de primer año de la carrera de Psicología en en la Universidad Nacional de San Luis y horas de lectura requeridas

    OpenAIRE

    Berdini, Enrique; Casari, Leandro

    2007-01-01

    Varios estudios indican que las diversas características de la bibliografía de los programas de las carreras de grado de psicología impactan directamente sobre la calidad de la enseñanza, siendo un factor importante para la eficacia del desarrollo profesional. En estudios anteriores realizados en la propia Universidad Nacional de San Luis, ya se han analizado las características de la bibiografía de siete cursos que los estudiantes de la carrera de Psicología en Universidad Nacional de San...

  8. Benchmarking London in the PISA Rankings

    Science.gov (United States)

    Jerrim, John; Wyness, Gill

    2016-01-01

    The Programme for International Student Assessment (PISA) is an important international study of 15-year-olds' academic achievement. Although PISA has traditionally been used to draw comparisons across countries, there is growing interest in the production of regional (i.e. city,state, or provincial level) results. In this paper we present the…

  9. The Case of Iceland in PISA: Girls' Educational Advantage

    Science.gov (United States)

    Halldorsson, Almar M.; Olafsson, Ragnar F.

    2009-01-01

    Among 41 participating countries in the Programme for International Student Assessment (PISA) 2003, the gender difference in favour of females was greatest in Iceland in the three subjects tested: mathematics, science and reading. The aims of this article are to put these findings in national and international context, and report on a number of…

  10. Educational inequalities and success in Asian countries in PISA 2009

    Directory of Open Access Journals (Sweden)

    Alba Castejón Company

    2011-09-01

    Full Text Available This article discusses the results of PISA 2009 from seven Asian countries. The analysis focuses on three hubs of educational inequality: academic inequalities, inequalities by gender and social in- equalities. The main conclusion drawn from the results of this work is that is not possible to affirm that Asian education systems constitute a homogeneous educational model.

  11. Sources of Immigrants' Underachievement: Results from PISA - Copenhagen

    Science.gov (United States)

    Rangvid, Beatrice Schindler

    2007-01-01

    This study examines potential sources of the immigrant-native test score gap using data from the recently released PISA replicate study for Copenhagen (Denmark). It is shown that even in a school system that is successfully equalizing endowments of traditional resources across schools attended by native and immigrant students, differences in other…

  12. 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…

  13. El fracaso escolar en la Europa mediterránea a través de PISA-2009 : radiografía de una realidad latente

    Directory of Open Access Journals (Sweden)

    Jorge Calero

    2012-01-01

    Full Text Available La reducción del fracaso escolar constituye uno de los mayores retos a los que se enfrentan los sistemas educativos de España e Italia. En este artículo se investiga la existencia de posibles elementos comunes a ambos países que permitan hablar de un «modelo mediterráneo» de fracaso escolar. Para ello, se aplica un modelo logístico multinivel a los microdatos correspondientes a la competencia lectora proporcionados por PISA- 2009. Las variables personales y las características socioeconómicas y culturales del hogar parecen tener un impacto similar en ambos países. Respecto a las variables de centro, Italia y España comparten el fuerte impacto del nivel socioeconómico de los padres y la reducida incidencia de los recursos materiales. Se detecta, no obstante, una fuerte disparidad entre países en cuanto al perfil sociocultural de los alumnos matriculados en los centros en función de su titularidad. Una vez controlada dicha disparidad, el impacto de la titularidad del centro parece ser irrelevante. Finalmente, se constatan disparidades de los efectos de variables relacionadas con la gestión de los centrosReducing school failure is among the main challenges of the Spanish and Italian educational systems. In this paper we aim at identifying elements common to both countries which allow us to talk about a «Mediterranean model» of school failure. We feed a multilevel logistic model with microdata from the reading competence of PISA-2009. Personal variables and the socioeconomic and cultural characteristics of the household have a similar impact in both countries. With regard to school level variables, Italy and Spain share a strong effect of the socioeconomic characteristics of the parents and a weak impact of material resources. There are, however, important differences in the socio-cultural profile of students attending schools, depending on their ownership. Once we control for these differences, the impact of school ownership seems

  14. 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.

  15. 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

  16. Guía estructurada bajo modelo Escuela Nueva para la enseñanza de Física en el grado quinto (5°) de la escuela rural de Matanzas de la Institución Educativa Carlos Ramón Repizo Cabrera

    OpenAIRE

    Córdoba Claros , Zoila Piedad

    2013-01-01

    Esta investigación, busca que las Instituciones Educativas inicien la enseñanza y aprendizaje de la Física como asignatura independiente de las Ciencias Naturales a los estudiantes de Básica Primaria; para tal caso se elaboró una cartilla de Física para el grado quinto de la Escuela Rural de Matanzas de la Institución Educativa Carlos Ramón Repizo ubicada en el municipio de San Agustín del departamento del Huila, que contiene guías diseñadas bajo el Modelo Escuela nueva. En consecuencia a...

  17. COSMOS (County of San Mateo Online System). A Searcher's Manual.

    Science.gov (United States)

    San Mateo County Superintendent of Schools, Redwood City, CA. Educational Resources Center.

    Operating procedures are explained for COSMOS (County of San Mateo Online System), a computerized information retrieval system designed for the San Mateo Educational Resources Center (SMERC), which provides interactive access to both ERIC and a local file of fugitive documents. COSMOS hardware and modem compatibility requirements are reviewed,…

  18. 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)

  19. A simple model of reactor cores for reactor neutrino flux calculations for the KamLAND experiment

    Energy Technology Data Exchange (ETDEWEB)

    Nakajima, K. [Research Center for Neutrino Science, Tohoku University, Sendai 980-8578 (Japan)]. E-mail: kyo@awa.tohoku.ac.jp; Inoue, K. [Research Center for Neutrino Science, Tohoku University, Sendai 980-8578 (Japan); Owada, K. [Research Center for Neutrino Science, Tohoku University, Sendai 980-8578 (Japan); Suekane, F. [Research Center for Neutrino Science, Tohoku University, Sendai 980-8578 (Japan); Suzuki, A. [Research Center for Neutrino Science, Tohoku University, Sendai 980-8578 (Japan); Hirano, G. [TEPCO Systems Corporation, Tokyo 135-0034 (Japan); Kosaka, S. [TEPCO Systems Corporation, Tokyo 135-0034 (Japan); Ohta, T. [Tokyo Electric Power Company, Tokyo 100-8560 (Japan); Tanaka, H. [Tokyo Electric Power Company, Tokyo 100-8560 (Japan)

    2006-12-21

    KamLAND is a reactor neutrino oscillation experiment with a very long baseline. This experiment successfully measured oscillation phenomena of reactor antineutrinos coming mainly from 53 reactors in Japan. In order to extract the results, it is necessary to accurately calculate time-dependent antineutrino spectra from all the reactors. A simple model of reactor cores and code implementing it were developed for this purpose. This paper describes the model of the reactor cores used in the KamLAND reactor analysis.

  20. Backscatter A [8101]--Offshore San Gregorio, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of SIM 3306 presents data for the acoustic-backscatter map (see sheet 3, SIM 3306) of the Offshore of San Gregorio map area, California. Backscatter data...

  1. LA TEXTUALIDAD Y LA AUTORÍA: UN EJERCICIO DESDE LOS TRABAJOS DE GRADO EN ARTES PLÁSTICAS Y VISUALES

    Directory of Open Access Journals (Sweden)

    Pedro Pablo Gómez

    2007-11-01

    Full Text Available En este artículo se presentan algunos de los resultados del Proyecto de investigación "análisis de cien trabajos de grado del Proyecto curricular de artes Plásticas y visuales" de la Facultad de artes asaB de la Universidad distrital Francisco José de caldas, realizado entre 2004 y 2006. el proyecto toma como punto de partida la hipótesis que afirma la existencia de actividades investigativas propias del campo del arte, las cuales son susceptibles de ser reconocidas a partir del análisis de los proyectos de grado. de acuerdo con lo anterior, se afirma que la investigación formativa se da en la formación artística y que ésta se objetiva en diferentes productos; uno de ellos, quizá el más importante, los trabajos de grado. luego, se presentarán algunas observaciones sobre la noción de textualidad y autoría que están implícitas en los trabajos de grado.

  2. Reactor Monitoring with Antineutrinos - A Progress Report

    Science.gov (United States)

    Bernstein, Adam

    2012-08-01

    The Reactor Safeguards regime is the name given to a set of protocols and technologies used to monitor the consumption and production of fissile materials in nuclear reactors. The Safeguards regime is administered by the International Atomic Energy Agency (IAEA), and is an essential component of the global Treaty on Nuclear Nonproliferation, recently renewed by its 189 remaining signators. (The 190th, North Korea, withdrew from the Treaty in 2003). Beginning in Russia in the 1980s, a number of researchers worldwide have experimentally demonstrated the potential of cubic meter scale antineutrino detectors for non-intrusive real-time monitoring of fissile inventories and power output of reactors. The detectors built so far have operated tens of meters from a reactor core, outside of the containment dome, largely unattended and with remote data acquisition for an entire 1.5 year reactor cycle, and have achieved levels of sensitivity to fissile content of potential interest for the IAEA safeguards regime. In this article, I will describe the unique advantages of antineutrino detectors for cooperative monitoring, consider the prospects and benefits of increasing the range of detectability for small reactors, and provide a partial survey of ongoing global research aimed at improving near-field and far field monitoring and discovery of nuclear reactors.

  3. 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.

  4. 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.

  5. 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…

  6. Facility for a Low Power Research Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Chalker, R. G.

    1949-09-14

    Preliminary investigation indicates that a reactor facility with ample research provisions for use by University or other interested groups, featuring safety in design, can be economically constructed in the Los Angeles area. The complete installation, including an underground gas-tight reactor building, with associated storage and experiment assembly building, administration offices, two general laboratory buildings, hot latoratory and lodge, can be constructed for approxinately $1,500,000. This does not include the cost of the reactor itself or of its auxiliary equipment,

  7. 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.

  8. 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......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...

  9. PISA — Pooling Information from Several Agents: Multiplayer Argumentation from Experience

    Science.gov (United States)

    Wardeh, Maya; Bench-Capon, Trevor; Coenen, Frans

    In this paper a framework, PISA (Pooling Information from Several Agents), to facilitate multiplayer (three or more protagonists), "argumentation from experience" is described. Multiplayer argumentation is a form of dialogue game involving three or more players. The PISA framework is founded on a two player argumentation framework, PADUA (Protocol for Argumentation Dialogue Using Association Rules), also developed by the authors. One of the main advantages of both PISA and PADUA is that they avoid the resource intensive need to predefine a knowledge base, instead data mining techniques are used to facilitate the provision of "just in time" information. Many of the issues associated with multiplayer dialogue games do not present a significant challenge in the two player game. The main original contributions of this paper are the mechanisms whereby the PISA framework addresses these challenges.

  10. Reflections on the performance of Ireland and Portugal in the OECD/PISA 2000 assessment of reading literacy

    Directory of Open Access Journals (Sweden)

    Gerry Shiel

    2002-01-01

    Full Text Available In 2000, 15-year olds in 28 member countries of the Organisation for Economic Co-operation and Development (OECD and four additional countries took part in the Programme for International Student Assessment (PISA. While PISA assessed three cognitive domains — reading literacy, mathematical literacy and scientific literacy — this paper focuses on reading literacy — the major assessment domain in 2000. The purpose of the paper is to reflect on the performance of students in two OECD countries — Ireland and Portugal. First, a context for considering the outcomes of PISA is provided by reviewing the outcomes of earlier international assessments of reading, in which Irish and Portuguese students performed at about the same levels. Second, the relatively strong performance of Ireland on the PISA reading literacy combined scale and subscales is contrasted with the relatively weaker performance of Portugal. Third, variables that are associated with performance on PISA, including school — and student-level socio-economic status, are considered. Fourth, links between the curriculum in English in Irish schools, the Irish Junior Certificate examination, and performance on PISA reading literacy are explored, and it is concluded similarities between these may account, in part, for the strong performance of Irish students on PISA. The paper concludes with a consideration of ways in wich PISA can inform policy in relation to the improvement of reading literacy in both Ireland and Portugal.

  11. 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. .

  12. Grado de homofobia en estudiantes de enfermería de una universidad pública en Colombia

    Directory of Open Access Journals (Sweden)

    Gloria Esperanza Zambrano-Plata

    2013-12-01

    Full Text Available Objetivo: determinar el grado de homofobia en los estudiantes de Enfermería de una universidad pública en Colombia. Materiales y Métodos: se utilizó el enfoque cuantitativo de tipo descriptivo; se tomó una muestra conformada por 317 estudiantes de un programa de Enfermería de una universidad pública en Colombia, que estaban activos en su formación académica; a los cuales se les aplicó el cuestionario Medición de la Homofobia diseñado por Lozano I, Díaz R en el 2010. 1 Resultados: se encontró que el 83,3% de los estudiantes de Enfermería no son homofóbicos es decir, respetan y aceptan las diversas orientaciones de las personas LGTBI; mientras que el 16,7% del estudiantado de Enfermería son homofóbicos, presentando prejuicios, discriminación, rechazo a su expresión homosexual, rechazo familiar, social y personal frente a su orientación; considerando que no son bien vistos ante la sociedad y que su condición los hace inferiores frente a los heterosexuales. Conclusiones: las percepciones negativas relacionadas con la homofobia podrían alterar el estado de salud de las personas discriminadas creando ambientes de hostilidad y falta a la disciplina de enfermería pudiendo incidir sobre los cuidados ofrecidos.

  13. Mida mõõtis PISA 2006? : ülevaade PISA 2006 taustauuringutest / Imbi Henno

    Index Scriptorium Estoniae

    Henno, Imbi

    2008-01-01

    2006. aasta võrdlusuuring PISA keskendus loodusteaduste- ja tehnoloogiaalasele kirjaoskusele, olles esimene rahvusvaheliselt tunnustatud uuring loodusteaduslike oskuste, huvide ja hoiakute, kooli ning loodusteaduste õpetamise konteksti hindamiseks

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

    Science.gov (United States)

    Peng, Mei; 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

    2016-02-01

    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-1 to 5.0 nm-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.

  15. PISA in Finland: An Education Miracle or an Obstacle to Change?

    Directory of Open Access Journals (Sweden)

    Pasi Sahlberg

    2011-01-01

    Full Text Available The present article discusses the role and impact of the Programme forInternational Student Assessment (PISA in Finland. PISA has createda new geography of education policies and reforms by shifting globalinterest away from Anglo-Saxon education systems to Asian countries,as well as to Finland and Canada in the West. The article describes how PISA has become evidence of the successful education reforms in Finland carried out since the 1970s, but at the same time has created a situation where the continuous renewal of the Finnish education system has become more difficult than before. The conclusion is that PISA is an important global benchmarking instrument, but that policy makers and the media need to make better use of the rich data that have been collected together with information about students’ academic performance.

  16. Long-term scenarios of mercury budgeting and exports for a Mediterranean hot spot (Marano-Grado Lagoon, Adriatic Sea)

    Science.gov (United States)

    Canu, Donata; Rosati, Ginevra

    2017-11-01

    The Marano-Grado Lagoon (MGL) is extensively contaminated by mercury (Hg) from local sources and long-term (500 years) tidally delivered inputs from the Idrija Hg mine (Slovenia) through Isonzo River suspended loads. A multibox WASP-7 (Water Analysis Simulation Program) model was used to simulate the long-term dynamics of the mercury cycle in the MGL. Scenario simulations were used to compute changes in the system over 100 years. Present and future Hg concentrations in water, sediment, and Hg budgets were compared, including evasion and MeHg inputs to the Mediterranean Sea, based on climate changes and mercury capping in tributary rivers. Using the Ref baseline scenario, the model computes a general decrease in HgT of 13% in the water column and of 80% in sediment and a strong MeHg increase in sediment (+73%). The net sea export of HgT decreases by 57% to up to 48 kg/y while MeHg increases by 10% to up to 0.63 kg/y. The lagoon sediment recovery time of HgT up to a target level of 0.3 mg/kg is computed over 570 years for surface sediments (1750 for subsurface sediments). When removing Hg from boundaries, the same target value for surface sediments is reached within 110 years.

  17. 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.

  18. Comportamiento a la corrosión del acero 316L sinterizado con distinto grado de porosidad

    Directory of Open Access Journals (Sweden)

    Soria, L.

    1998-05-01

    Full Text Available AISI 316L sintered samples, with porosities ranging from 9 to 40 %, and without alloying losses at the surface, have been prepared. Those samples, along with conventional (rolled steel samples, have been subjected to electrochemical and immersion corrosion tests. According to porosity size quantitative measurements, before and after corrosion tests, two corrosion mechanisms, general and pitting, are proposed depending on the initial porosity.

    A partir de polvos de acero inoxidable AISI 316L, se han preparado muestras con distinto grado de porosidad, entre el 9 y el 40 %, asegurando que la superficie externa no resulta alterada durante el procesado pulvimetalúrgico. Junto a muestras de chapa laminada de la misma composición, han sido sometidas a ensayos de inmersión y a ensayos electroquímicos de corrosión. Estudios cuantitativos de la evolución de la porosidad superficial, antes y después de los ensayos, permiten plantear diversas hipótesis acerca de los mecanismos de corrosión actuantes en función de la porosidad de las piezas.

  19. 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.

  20. 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.

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

    CERN Document Server

    Littrell, K C; Carpenter, J M; Seeger, P A

    2002-01-01

    We have designed a versatile high-data-rate SANS instrument (broad-range intense multipurpose SANS (BRIMS)) for the proposed long-wavelength target station at the SNS using the Los Alamos NISP Monte Carlo simulation package. BRIMS is designed to produce data spanning a Q range from 0.0025 to 0.7 A sup - sup 1 in a single measurement by simultaneously using neutrons with wavelengths from 1 to 14.5 A in a time-of-flight mode. The effects of various collimation choices, including multiple confocal pinhole apertures, on count rate, resolution, and Q range have been characterized with simulations using spherical particle and delta-function scatterers. We compare the anticipated performance of BRIMS with that of the premier reactor-based SANS instrument, D22, at ILL. (orig.)

  2. 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.

  3. 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.

  4. 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.

  5. 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

  6. Toxicología ambiental y salud pública en la Universidad de Zaragoza: Adecuación de la guía docente mediante una matriz de contextualización en el Grado en Ciencias Ambientales

    OpenAIRE

    A. Frutos Pérez-Surio; N. Gayán Margelí

    2012-01-01

    Toxicología Ambiental y Salud Pública es una asignatura obligatoria del grado en Ciencias Ambientales impartido en la Escuela Politécnica Superior de Huesca de la Universidad de Zaragoza. Al ser la única asignatura del grado directamente responsable de la transferencia de conocimiento en materia de salud, se hace necesario definir claramente las relaciones con otras asignaturas dentro del marco de contextualización del grado y recoger estas relaciones en la elaboración de la Guía Docent...

  7. 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

  8. The Relationship of School-Based Parental Involvement with Student Achievement: A Comparison of Principal and Parent Survey Reports from PISA 2012

    Science.gov (United States)

    Sebastian, James; Moon, Jeong-Mi; Cunningham, Matt

    2017-01-01

    This paper explores parental involvement using principal and parent survey reports to examine whether parents' involvement in their children's schools predicts academic achievement. Survey data from principals and parents of seven countries from the PISA 2012 database and hierarchical linear modelling were used to analyse between- and within-…

  9. Development of a One-Dimensional Small-Angle Neutron Scattering Instrument at the University of Illinois TRIGA Reactor Laboratory

    Science.gov (United States)

    Monti, D. A.; Guillermo, N. R.; Hulin, M. J.; Heuser, B. J.; Toreja, A.; Moschetti, T. L.

    1996-03-01

    A small-angle neutron scattering instrument with slit-smeared geometry (1-D SANS) has been constructed at the University of Illinois 1.5 MWatt TRIGA reactor. This facility falls under the general heading of "low-flux research reactors" which typically are not used for neutron scattering research. Low-flux reactors can support neutron scattering research under certain conditions, however. 1-D SANS using elastically-bent crystal optics is one such example [Popovici, et al. (1995). J. Phys. Chem. Solids 56, 1425-1431]. Our instrument uses a pyrolytic graphite pre-monochromator and two elastically-bent Si wafers, all in a (+,+,-) configuration. Instrumental performance including low-angle resolution, on-sample intensity, resolution variability, and cross-section measurement capability will be presented.

  10. EL ENFOQUE INTERDISCIPLINARIO DE LOS CONTENIDOS COMO VÍA PARA LOGRAR UN PROCESO ENSEÑANZA-APRENDIZAJE MÁS EFECTIVO EN LA ESCUELA MULTÍGRADO

    Directory of Open Access Journals (Sweden)

    Juana Comendador Laguna

    2009-06-01

    Full Text Available El trabajo hace referencia a un sistema de ejercicios y al procedimiento para su elaboración, de acuerdo con los dos momentos de desarrollo de los niños en etapa escolar que estudian en escuelas multígrados, estos son: 1ro-2do y 3ro-4to. Esta propuesta facilita el aprendizaje más efectivo de los contenidos de la asignatura “El mundo en que vivimos”, y favorece la actividad independiente, la socialización del proceso, la sistematización de los conocimientos, y la atención a la diversidad en las aulas multígrados.

  11. Prueba de Evaluación Continuada (PEC) de la asignatura "Fundamentos de programación" (Grado de Ingeniería Informática)

    OpenAIRE

    IT, Multimedia and Telecommunications Department

    2010-01-01

    Prueba de Evaluación Continuada (PEC) de la asignatura "Fundamentos de programación" (Grado de Ingeniería Informática) Prova d'Avaluació Continuada (PAC) de l'assignatura "Fonaments de programació" (Grau d'Enginyeria Informàtica). Continuous Assessment Practices (PAC/PEC) of the "Programming Fundamentals" course (Computer Engineering Degree).

  12. ¿Existen alternativas a las clases magistrales? Una experiencia en Fisiología Ocular del grado de Óptica y Optometría

    Directory of Open Access Journals (Sweden)

    Abadía Valle, Ana Rosa

    2011-12-01

    Full Text Available In this article we explain how, by applying problem-based learning methods and continuous assessment to first-year optics degree students studying ocular physiology, an improvement in their overall final marks has been achieved.

    En este artículo exponemos cómo aplicando la metodología del Aprendizaje Basado en Problemas (ABP y un sistema de evaluación continua a alumnos de primer curso del grado de Óptica en la asignatura de Fisiología Ocular han mejorado, con carácter general, las calificaciones finales de los alumnos.

  13. [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.

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

    OpenAIRE

    Miriam Lucía Rocha Navarro; Sanjuana Serrano Reyes; Martha Eugenia Fajardo Araujo; Víctor Hugo Giovani Servín Zavala

    2014-01-01

    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 ...

  15. Portafolio Practicum I 2010-2011. Grado en Enfermería

    OpenAIRE

    Carnicer Fuentes, Inmaculada Concepción; Castro Yuste, Cristina; Martínez Nieto, José Manuel; Abellán Hervás, María José; Fuentes Cebada, Luis; Delgado Romero, Ascensión; Sanlés Pérez, Manuel; García Cabanillas, María José; Sainz Otero, Ana María; Moreno Corral, Luis Javier

    2011-01-01

    El documento incluye información sobre los aspectos básicos previos al inicio de las prácticas clínicas: documentos a consultar, recomendaciones, normas, cómo usar el portafolio-cuaderno de prácticas y un listado con las actuaciones a realizar durante el periodo de prácticas clínicas correspondiente al Practicum I. También incluye actividades a realizar y reflexiones sobre lo aprendido. Los Estudiantes registran en el portafolio cuantitativa y cualitativamente la implementación de dichas acti...

  16. Portafolio Practicum II/III 2011-2012. Grado en Enfermería

    OpenAIRE

    Castro Yuste, Cristina; Martínez Nieto, José Manuel; Carnicer Fuentes, Inmaculada Concepción; Rodríguez Cornejo, María Jesús; Ruiz Jiménez, Miguel Ángel; Abellán Hervás, María José; Sanlés Pérez, Manuel; Fuentes Cebada, Luis; García Cabanillas, María José; Sainz Otero, Ana María; Moreno Corral, Luis Javier

    2011-01-01

    El documento incluye información sobre los aspectos básicos previos al inicio de las prácticas clínicas: documentos a consultar, recomendaciones, normas, cómo usar el portafolio-cuaderno de prácticas y un listado con las actuaciones a realizar durante el periodo de prácticas clínicas correspondiente al Practicum II y III. También incluye actividades a realizar y reflexiones sobre lo aprendido. Los Estudiantes registran en el portafolio cuantitativa y cualitativamente la implementación de dich...

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

    OpenAIRE

    González Cervantes, Sergio

    2016-01-01

    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...

  18. 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.

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

    OpenAIRE

    Giomar Herrera-Amaya; Fred Gustavo Manrique-Abril

    2008-01-01

    Objetivo: evaluar la satisfacción laboral con la modalidad de contratación y el tipo de vinculación en profesionales de enfermería de un hospital de tercer nivel de Tunja, Boyacá, Colombia, entre junio y diciembre de 2005. Método: estudio de corte transversal con 39 profesionales del hospital utilizando el NTP 394 (Overal Job Satisfaction, autorizado por Pérez-Bilbao). Se analizó la información en Epiinfo 2002, se buscaron diferencias entre medias a través de Kruskall Wallis con IC 95% p...

  20. Grado de control de la Anticoagulación en España.

    OpenAIRE

    Polo García, José

    2017-01-01

    Introducción: La fibrilación auricular (FA), es la arritmia más frecuente y su prevalencia aumenta con la edad. Afecta a 0,6% de la población, y del 6% al 8% de los sujetos mayores de 60 y 80 años. Los pacientes con FA tienen una morbilidad cinco veces mayor y el doble de mortalidad que los que tienen ritmo sinusal. Justificación: El tratamiento con antagonistas de la vitamina K (AVK), reduce en 2 tercios el riesgo de accidentes cerebrovasculares (ACV) y en 1 cuarto la mortalidad. La adm...

  1. Grado de adherencia al protocolo de registros clínicos de enfermería

    OpenAIRE

    Luz Marina Bautista Rodríguez; Leidy Yeraldin Vejar Río; Mary Rolecxy Pabón Parra; Jackson Jesús Moreno; Ludy Fuentes Rodríguez; Kenny Yelibeth León Solano; Jorge Andrés Bonilla

    2016-01-01

    Introducción: La utilización de las guías de manejo clínicas, protocolos y manuales se constituyen en un elemento fundamental para la prestación de servicios de salud con calidad. El protocolo de registros clínicos es una herramienta que orienta al personal de enfermería en los lineamientos claves que se deben tener en cuenta en cada uno de los cuidados que se brindan.  Materiales y Métodos: Se realizó un estudio cuantitativo de tipo descriptivo de corte transversal. La muestra estuvo conform...

  2. Reactor modeling and physicochemical properties characterization for a polyethylene fluidized bed reactor

    OpenAIRE

    Fernandes, F.A.N.; LONA BATISTA,L. M. F.

    1999-01-01

    A new steady state model for the fluidized bed reactor and a physicochemical characterization model were developed for the simulation of polyethylene production using gas-phase technology. The association of these models was done in order to predict the characteristics of the polymer produced in the fluidized bed reactor (molecular weight, polydispersity, melt index, and other characteristics) throughout the reactor and also to predict the growth of the polymer particle.

  3. Regurgitation quantification using 3D PISA in volume echocardiography.

    Science.gov (United States)

    Grady, Leo; Datta, Saurabh; Kutter, Oliver; Duong, Christophe; Wein, Wolfgang; Little, Stephen H; Igo, Stephen R; Liu, Shizhen; Vannan, Mani

    2011-01-01

    We present the first system for measurement of proximal isovelocity surface area (PISA) on a 3D ultrasound acquisition using modified ultrasound hardware, volumetric image segmentation and a simple efficient workflow. Accurate measurement of the PISA in 3D flow through a valve is an emerging method for quantitatively assessing cardiac valve regurgitation and function. Current state of the art protocols for assessing regurgitant flow require laborious and time consuming user interaction with the data, where a precise execution is crucial for an accurate diagnosis. We propose a new improved 3D PISA workflow that is initialized interactively with two points, followed by fully automatic segmentation of the valve annulus and isovelocity surface area computation. Our system is first validated against several in vitro phantoms to verify the calculations of surface area, orifice area and regurgitant flow. Finally, we use our system to compare orifice area calculations obtained from in vivo patient imaging measurements to an independent measurement and then use our system to successfully classify patients into mild-moderate regurgitation and moderate-severe regurgitation categories.

  4. Rodded shutdown system for a nuclear reactor

    Science.gov (United States)

    Golden, Martin P.; Govi, Aldo 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. 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.

  5. FUEL ASSEMBLY FOR A NEUTRONIC REACTOR

    Science.gov (United States)

    Wigner, E.P.

    1958-04-29

    A fuel assembly for a nuclear reactor of the type wherein liquid coolant is circulated through the core of the reactor in contact with the external surface of the fuel elements is described. In this design a plurality of parallel plates containing fissionable material are spaced about one-tenth of an inch apart and are supported between a pair of spaced parallel side members generally perpendicular to the plates. The plates all have a small continuous and equal curvature in the same direction between the side members.

  6. La Psicología Política en la Universidad Nacional de San Luis – Argentina

    OpenAIRE

    Parisí, Elio Rodolfo; Manzi, Adrián; Cuello Pagnone, Marina Soledad

    2017-01-01

    El artículo propone un recorrido histórico institucional por las características de producción de conocimiento en Psicología Política en un espacio académico (Universidad Nacional de San Luis, Argentina), sus influencias, y su articulación con la formación profesional de grado en psicología. Desde la perspectiva propuesta, la Psicología Política reflexiona sobre las personas y analiza su dimensión subjetiva, recuperando su condición humana a partir de las mediaciones históricas micro y macro ...

  7. A fast and flexible reactor physics model for simulating neutron spectra and depletion in fast reactors

    Science.gov (United States)

    Recktenwald, Geoff; Deinert, Mark

    2010-03-01

    Determining the time dependent concentration of isotopes within a nuclear reactor core is central to the analysis of nuclear fuel cycles. We present a fast, flexible tool for determining the time dependent neutron spectrum within fast reactors. The code (VBUDS: visualization, burnup, depletion and spectra) uses a two region, multigroup collision probability model to simulate the energy dependent neutron flux and tracks the buildup and burnout of 24 actinides, as well as fission products. While originally developed for LWR simulations, the model is shown to produce fast reactor spectra that show high degree of fidelity to available fast reactor benchmarks.

  8. 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.

  9. Proyecto de Ingeniería Mecánica integrador de conocimientos. Cuarto cuatrimestre del Grado de Ingeniería en Tecnologías Industriales

    OpenAIRE

    Cardona Foix, Salvador; Jordi Nebot, Lluïsa; Puig Ortiz, Joan

    2012-01-01

    El plan de estudios del grado de Ingeniería en Tecnologías Industriales en la Escuela Técnica Superior de Ingeniería Industrial de Barcelona incluye en el cuarto cuatrimestre la asignatura Proyecto I cuyo objetivo es que el alumnado aprenda a plantear correctamente un problema de ingeniería concreto y encuentre una solución que pueda resolverlo a partir de los conocimientos básicos que posee de matemáticas, dibujo, programación y mecánica. En paralelo, está cursando Teoría de Máqu...

  10. Forecasting Selenium Discharges to the San Francisco Bay-Delta Estuary: Ecological Effects of A Proposed San Luis Drain Extension

    Science.gov (United States)

    Presser, Theresa S.; Luoma, Samuel N.

    2006-01-01

    Selenium discharges to the San Francisco Bay-Delta Estuary (Bay-Delta) could change significantly if federal and state agencies (1) approve an extension of the San Luis Drain to convey agricultural drainage from the western San Joaquin Valley to the North Bay (Suisun Bay, Carquinez Strait, and San Pablo Bay); (2) allow changes in flow patterns of the lower San Joaquin River and Bay-Delta while using an existing portion of the San Luis Drain to convey agricultural drainage to a tributary of the San Joaquin River; or (3) revise selenium criteria for the protection of aquatic life or issue criteria for the protection of wildlife. Understanding the biotransfer of selenium is essential to evaluating effects of selenium on Bay-Delta ecosystems. Confusion about selenium threats to fish and wildlife stem from (1) monitoring programs that do not address specific protocols necessary for an element that bioaccumulates; and (2) failure to consider the full complexity of the processes that result in selenium toxicity. Past studies show that predators are more at risk from selenium contamination than their prey, making it difficult to use traditional methods to predict risk from environmental concentrations alone. This report presents an approach to conceptualize and model the fate and effects of selenium under various load scenarios from the San Joaquin Valley. For each potential load, progressive forecasts show resulting (1) water-column concentration; (2) speciation; (3) transformation to particulate form; (4) particulate concentration; (5) bioaccumulation by invertebrates; (6) trophic transfer to predators; and (7) effects on those predators. Enough is known to establish a first-order understanding of relevant conditions, biological response, and ecological risks should selenium be discharged directly into the North Bay through a conveyance such as a proposed extension of the San Luis Drain. The approach presented here, the Bay-Delta selenium model, determines the mass, fate

  11. Productivity of giant reed (Arundo donax L. and miscanthus (Miscanthus x giganteus Greef et Deuter as energy crops: growth analysis

    Directory of Open Access Journals (Sweden)

    Nicoletta Nassi o Di Nasso

    2011-07-01

    Full Text Available The growing interest in bioenergy crops is leading to the development of new research aims. In fact, there is a lack of knowledge of most of these crops in terms of suitability to specific environmental conditions and of biotic and abiotic influences. The objective of our study was to compare giant reed (Arundo donax L. and miscanthus (Miscanthus × giganteus Greef et Deuter, two promising lignocellulosic energy crops in Southern Europe, in terms of productivity, through growth analysis, in order to understand environmental and/or management constraints to crop development. Our research was carried out in 2009, in San Piero a Grado, Pisa (Central Italy; latitude 43°41’ N, longitude 10°21’ E, on a seven-year-old crop, in loam soil characterised by good nutrient and water availability. Results confirmed high yields in both species, about 40 t/ha/yr in miscanthus and 30 t/ha/yr in giant reed, achieved in the second half of October. Different growth strategies were noted as miscanthus developed a greater number of stems per square meter and higher stems, although it showed minor basal stem diameter and leaf area changes. In addition, the physiological difference between crop pathways (C3 in giant reed vs C4 in miscanthus in a non-limiting environment allowed miscanthus to perform better. As a result, the choice of the proper crop has to be made in order to obtain maximum yield levels, minimising external inputs and optimising the land use.

  12. Percepción de los estudiantes y egresados del grado de enfermería sobre su formación en farmacología

    OpenAIRE

    Tovar Reinoso, Alberto

    2016-01-01

    Los profesionales de enfermería tienen una gran responsabilidad en el proceso de administración de medicamentos. El desempeño de esta actividad requiere tener conocimientos y habilidades sobre el uso de los medicamentos para garantizar que su administración es eficaz y segura. En el plan de estudios del Grado en Enfermería, los futuros profesionales cursan una materia que les proporciona dicha formación: la farmacología. El objetivo de esta tesis es conocer la percepción de los estudiantes y ...

  13. METHOD OF OPERATING A NEUTRONIC REACTOR

    Science.gov (United States)

    Turkevich, A.

    1963-01-22

    This patent relates to one step in a method of operating a neutronic reactor consisting of a slurry of fissionable material in heavy water. Deuterium gas is passed through the slurry to sweep gaseous fission products therefrom and the deuterium is then separated from the gaseous fission products. (AEC)

  14. A comparison of radioactive waste from first generation fusion reactors and fast fission reactors with actinide recycling

    Energy Technology Data Exchange (ETDEWEB)

    Koch, M.; Kazimi, M.S.

    1991-04-01

    Limitations of the fission fuel resources will presumably mandate the replacement of thermal fission reactors by fast fission reactors that operate on a self-sufficient closed fuel cycle. This replacement might take place within the next one hundred years, so the direct competitors of fusion reactors will be fission reactors of the latter rather than the former type. Also, fast fission reactors, in contrast to thermal fission reactors, have the potential for transmuting long-lived actinides into short-lived fission products. The associated reduction of the long-term activation of radioactive waste due to actinides makes the comparison of radioactive waste from fast fission reactors to that from fusion reactors more rewarding than the comparison of radioactive waste from thermal fission reactors to that from fusion reactors. Radioactive waste from an experimental and a commercial fast fission reactor and an experimental and a commercial fusion reactor has been characterized. The fast fission reactors chosen for this study were the Experimental Breeder Reactor 2 and the Integral Fast Reactor. The fusion reactors chosen for this study were the International Thermonuclear Experimental Reactor and a Reduced Activation Ferrite Helium Tokamak. The comparison of radioactive waste parameters shows that radioactive waste from the experimental fast fission reactor may be less hazardous than that from the experimental fusion reactor. Inclusion of the actinides would reverse this conclusion only in the long-term. Radioactive waste from the commercial fusion reactor may always be less hazardous than that from the commercial fast fission reactor, irrespective of the inclusion or exclusion of the actinides. The fusion waste would even be far less hazardous, if advanced structural materials, like silicon carbide or vanadium alloy, were employed.

  15. 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%.

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

    Directory of Open Access Journals (Sweden)

    W. Ambrosini

    2009-01-01

    Full Text Available 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.

  17. Historical Developments of Pyrolysis Reactors : A Review

    NARCIS (Netherlands)

    Garcia-Nunez, J. A.; Pelaez-Samaniego, M.R.; Garcia-Perez, M. E.; Fonts, I.; Abrego, J.; Westerhof, R. J.M.; Garcia Perez, M.

    2017-01-01

    This paper provides a review of pyrolysis technologies, focusing on reactor designs and companies commercializing these technologies. The renewed interest in pyrolysis is driven by the potential to convert lignocellulosic materials into bio-oil and biochar and the use of these intermediates for the

  18. Factores significativos del rendimiento excelente: PISA y otros estudios Fatores significativos no rendimento excelente: PISA e outros estudos Significant factors in the yield excellent: PISA and other studies

    Directory of Open Access Journals (Sweden)

    Carmen Jiménez Fernández

    2012-12-01

    Full Text Available Se centra en tres investigaciones sobre los alumnos con rendimiento excelente. El estudio de PISA Top of de class, que analiza los factores subyacentes al rendimiento excelente de los alumnos de 15-16 años; el estudio de una muestra de alumnos españoles que han obtenido Premio Extraordinario de Bachillerato (PEB y un tercer estudio sobre alumnos que han obtenido Beca de Excelencia (BEpara estudiar en la universidad de Madrid. Se concluye que aunque la procedencia social no es determinante, la mayor parte de los alumnos con rendimiento excelente proceden de ambientes culturalmente favorecidos si bien el centro escolar ejerce mayor influencia que la clase social; la cantidad de horas semanales que el currículo dedica a la enseñanza de las materias fundamentales y la cantidad de horas que el alumno dedica al estudio son factores importantes del rendimiento excelente; los centros con mejor rendimiento atraen más a los alumnos con rendimiento excelente y, a su vez, hay más alumnos con rendimiento excelente en los centros más elitistas; en el estudio de PISA no hay diferencias de género; en los estudios sobre alumnos con PEB y BE persisten reductos sexistas.O presente trabalho se centra em três pesquisas sobre alunos com rendimento excelente. O estudo de PISA Top of de class, que analisa os fatores subjacentes ao rendimento excelente de alunos entre 15 e16 anos; o estudo de uma amostra de alunos espanhóis que obtiveram o Premio Extraordinário de Ensino Médio e um terceiro estudo sobre alunos que obtiveram Bolsa de Excelência para estudar na Universidade de Madrid. Chega-se à conclusão que embora a procedência social não seja determinante, a maior parte dos alunos com rendimento excelente procedem de ambientes culturalmente favorecidos, ainda que o centro escolar exerce maior influência que a classe social; a quantidade de horas semanais que o currículo dedica ao ensino das disciplinas fundamentais e a quantidade de horas que o aluno

  19. 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.

  20. Biodiesel production using a membrane reactor.

    Science.gov (United States)

    Dubé, M A; Tremblay, A Y; Liu, J

    2007-02-01

    The immiscibility of canola oil in methanol provides a mass-transfer challenge in the early stages of the transesterification of canola oil in the production of fatty acid methyl esters (FAME or biodiesel). To overcome or rather, exploit this situation, a two-phase membrane reactor was developed to produce FAME from canola oil and methanol. The transesterification of canola oil was performed via both acid- or base-catalysis. Runs were performed in the membrane reactor in semi-batch mode at 60, 65 and 70 degrees C and at different catalyst concentrations and feed flow rates. Increases in temperature, catalyst concentration and feedstock (methanol/oil) flow rate significantly increased the conversion of oil to biodiesel. The novel reactor enabled the separation of reaction products (FAME/glycerol in methanol) from the original canola oil feed. The two-phase membrane reactor was particularly useful in removing unreacted canola oil from the FAME product yielding high purity biodiesel and shifting the reaction equilibrium to the product side.

  1. Reactor FaceMap Tool: A modern graphics tool for displaying reactor data

    Energy Technology Data Exchange (ETDEWEB)

    Roberts, J.C.

    1991-12-31

    A prominent graphical user interface in reactor physics applications at the Savannah River Site is the reactor facemap display. This is a two dimensional view of a cross section of a reactor. In the past each application which needed a facemap implemented its own version. Thus, none of the code was reused, the facemap implementation was hardware dependent and the user interface was different for each facemap. The Reactor FaceMap Tool was built to solve these problems. Through the use of modern computing technologies such as X Windows, object-oriented programming and client/server technology the Reactor FaceMap Tool has the flexibility to work in many diverse applications and the portability to run on numerous types of hardware.

  2. 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.

  3. 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.

  4. Development of a system model for advanced small modular reactors.

    Energy Technology Data Exchange (ETDEWEB)

    Lewis, Tom Goslee,; Holschuh, Thomas Vernon,

    2014-01-01

    This report describes a system model that can be used to analyze three advance small modular reactor (SMR) designs through their lifetime. Neutronics of these reactor designs were evaluated using Monte Carlo N-Particle eXtended (MCNPX/6). The system models were developed in Matlab and Simulink. A major thrust of this research was the initial scoping analysis of Sandias concept of a long-life fast reactor (LLFR). The inherent characteristic of this conceptual design is to minimize the change in reactivity over the lifetime of the reactor. This allows the reactor to operate substantially longer at full power than traditional light water reactors (LWRs) or other SMR designs (e.g. high temperature gas reactor (HTGR)). The system model has subroutines for lifetime reactor feedback and operation calculations, thermal hydraulic effects, load demand changes and a simplified SCO2 Brayton cycle for power conversion.

  5. 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.

  6. A comparative study of kinetics of nuclear reactors

    Directory of Open Access Journals (Sweden)

    Obaidurrahman Khalilurrahman

    2009-01-01

    Full Text Available The paper deals with the study of reactivity initiated transients to investigate major differences in the kinetics behavior of various reactor systems under different operating conditions. The article also states guidelines to determine the safety limits on reactivity insertion rates. Three systems, light water reactors (pressurized water reactors, heavy water reactors (pressurized heavy water reactors, and fast breeder reactors are considered for the sake of analysis. The upper safe limits for reactivity insertion rate in these reactor systems are determined. The analyses of transients are performed by a point kinetics computer code, PKOK. A simple but accurate method for accounting total reactivity feedback in kinetics calculations is suggested and used. Parameters governing the kinetics behavior of the core are studied under different core states. A few guidelines are discussed to project the possible kinetics trends in the next generation reactors.

  7. Diseño curricular de las asignaturas de Física en los nuevos grados de Ingeniería y Arquitectura

    OpenAIRE

    Pérez Molina, Manuel; Fernandez-Varo, Helena; Alvarez, Mariela L.; Vera Guarinos, Jenaro; Gallego, Sergi; Beléndez Vázquez, Tarsicio; Dale Valdivia, Roberto; Heredia-Avalos, Santiago; Yebra Calleja, María Soledad; Beléndez,Augusto; Torrejon, Jose M.; Martín García, Agapito; Hernández Prados, Antonio; Rosa-Herranz, Julio; Moreno Marín, Juan Carlos

    2010-01-01

    En este trabajo proponemos un diseño curricular para las asignaturas de Física de primer curso correspondientes a los nuevos grados en Ingeniería y Arquitectura que se ofertarán en la Universidad de Alicante el curso 2010/2011. Nuestro diseño se centra en dos pilares fundamentales: el planteamiento de metodologías y materiales docentes adecuados a las competencias de las asignaturas y la coordinación de las distintas actividades a realizar en clases de teoría, de prácticas de laboratorio y de...

  8. Posibilidades didácticas del cine comercial en las ciencias de la salud: el caso del Grado en Enfermería de la Universidad de Sevilla

    OpenAIRE

    Bernet Toledano, Francisco Javier

    2016-01-01

    Falta palabras clave Esta Tesis Doctoral presenta un estudio descriptivo de corte básicamente cualitativo, ligado a un diseño de estudio de casos simple. No obstante, en su desarrollo hace uso de técnicas de investigación cuantitativas. Su objeto de estudio se centra en el análisis del uso didáctico que se le está dando en el presente al cine comercial, en el Grado en Enfermería de la Facultad de Enfermería, Fisioterapia y Podología de la Universidad de Sevilla. El marco teórico de la ...

  9. How Much Progress Do Children in Shanghai Make Over One Academic Year? Evidence From PISA

    Directory of Open Access Journals (Sweden)

    Jake Anders

    2016-11-01

    Full Text Available Since its entry into the Programme for International Student Assessment (PISA in 2009, the Chinese province of Shanghai has been the top-performing economy within these international rankings. Many have interpreted this as demonstrating how Shanghai has a “world class” education system, the most effective teaching methods, and the best schools. This article questions such interpretations of the PISA results. Specifically, we argue that statements about school and school system quality require information on the progress that children make during their time at school, which the PISA rankings do not provide (at least not directly. Our empirical analysis then uses a “fuzzy” regression discontinuity design approach to demonstrate how a rather different perspective of Shanghai’s performance in PISA emerges once pupils’ academic progress over one particular school year is considered. Our key finding is that the first year of upper secondary school in Shanghai adds essentially no value (on average to children’s PISA reading, science, and mathematics test scores.

  10. A Novel Dual-Stage Hydrothermal Flow Reactor

    DEFF Research Database (Denmark)

    Hellstern, Henrik Christian; Becker, Jacob; Hald, Peter

    2015-01-01

    The dual-stage reactor is a novel continuous flow reactor with two reactors connected in series. It is designed for hydrothermal flow synthesis of nanocomposites, in which a single particle consists of multiple materials. The secondary material may protect the core nanoparticle from oxidation...

  11. Determination of parameters of a nuclear reactor through noise measurements

    Science.gov (United States)

    Cohn, C.E.

    1975-07-15

    A method of measuring parameters of a nuclear reactor by noise measurements is described. Noise signals are developed by the detectors placed in the reactor core. The polarity coincidence between the noise signals is used to develop quantities from which various parameters of the reactor can be calculated. (auth)

  12. A Semi-Batch Reactor Experiment for the Undergraduate Laboratory

    Science.gov (United States)

    Derevjanik, Mario; Badri, Solmaz; Barat, Robert

    2011-01-01

    This experiment and analysis offer an economic yet challenging semi-batch reactor experience. Household bleach is pumped at a controlled rate into a batch reactor containing pharmaceutical hydrogen peroxide solution. Batch temperature, product molecular oxygen, and the overall change in solution conductivity are metered. The reactor simulation…

  13. Nuevas herramientas interactivas para la docencia: El diario de clase y su aplicación en el Grado de Criminología y Seguridad.

    OpenAIRE

    Pastor Yuste, Raquel; Rivas Castillo, María Isabel

    2015-01-01

    El proyecto de innovación docente consistió en el diseño y ejecución de una nueva herramienta interactiva para la docencia, denominada “Diario de Clase”, y desarrollada en el marco de las asignaturas “Fundamentos de Derecho Público”, “Sociología Criminal”, y “Técnicas de Investigación Cuantitativas y Cualitativas en Criminología”, correspondientes a tres de los cuatro cursos que conforman el título del Grado en Criminología y Seguridad. La nueva herramienta docente supuso un esfuerzo de...

  14. Red de desarrollo de metodología de trabajo colaborativo entre las asignaturas de Acondicionamiento y Servicios I y II del Grado en Arquitectura

    OpenAIRE

    Pérez Millán, Isabel; González Avilés, Ángel Benigno; Echarri Iribarren, Víctor; Ramírez Pacheco, Gema; Solbes Llorca, Joaquín; Botella Guillén, Francisco Javier

    2016-01-01

    El propósito fundamental de esta red es la implantación de una nueva metodología de aprendizaje colaborativo entre las asignaturas de Acondicionamiento y Servicios I de 3º y Acondicionamiento y Servicios II de 4º del Grado en Fundamentos de Arquitectura. A lo largo de estas asignaturas los alumnos deben adquirir la capacidad de trabajo en grupo, repartiendo las tareas y asumiendo roles. A través de un supuesto práctico real común para las dos asignaturas, deben proyectar y resolver problemas ...

  15. Method for filling a reactor with a catalyst

    DEFF Research Database (Denmark)

    2013-01-01

    The invention relates to a method for filling a reactor with a catalyst for the carbonylation of carbonylated compounds in the gas phase. According to said method, a SILP catalyst is covered with a filling agent which is liquid under normal conditions and is volatile under carbonylation reaction...... conditions, and a thus-treated catalyst is introduced into the reactor and the reactor is sealed....

  16. 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

  17. Method for automatically scramming a nuclear reactor

    Science.gov (United States)

    Ougouag, Abderrafi M.; Schultz, Richard R.; Terry, William K.

    2005-12-27

    An automatically scramming nuclear reactor system. One embodiment comprises a core having a coolant inlet end and a coolant outlet end. A cooling system operatively associated with the core provides coolant to the coolant inlet end and removes heated coolant from the coolant outlet end, thus maintaining a pressure differential therebetween during a normal operating condition of the nuclear reactor system. A guide tube is positioned within the core with a first end of the guide tube in fluid communication with the coolant inlet end of the core, and a second end of the guide tube in fluid communication with the coolant outlet end of the core. A control element is positioned within the guide tube and is movable therein between upper and lower positions, and automatically falls under the action of gravity to the lower position when the pressure differential drops below a safe pressure differential.

  18. Inherently safe reactors and a second nuclear era.

    Science.gov (United States)

    Weinberg, A M; Spiewak, I

    1984-06-29

    The Swedish PIUS reactor and the German-American small modular high-temperature gas-cooled reactor are inherently safe-that is, their safety relies not upon intervention of humans or of electromechanical devices but on immutable principles of physics and chemistry. A second nuclear era may require commercialization and deployment of such inherently safe reactors, even though existing light-water reactors appear to be as safe as other well-accepted sources of central electricity, particularly hydroelectric dams.

  19. San Diego Schools Set a New Agenda after Backlash

    Science.gov (United States)

    Sparks, Sarah D.

    2010-01-01

    Ten years after the San Diego school district gained national attention for its short-lived "Blueprint for Student Success," a crowd of district officials last week rolled out a new improvement plan that is almost the opposite of its controversial predecessor. The city's blueprint reforms--largely dismantled after a charismatic and…

  20. 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.

  1. Industria 4.0 en el Grado de Ingeniería Electrónica y Automática.

    OpenAIRE

    Catalán, Carlos; Serna, Félix; Blesa, Alfonso

    2015-01-01

    Recientemente ha surgido el término Industria 4.0 aplicado a factorías que pretenden ser más ágiles y eficientes en sus procesos de manufactura. Esta agilidad y eficiencia es posible por el uso masivo de las tecnologías de la información y las comunicaciones. En este trabajo se analizan planes de estudio del Grado de Ingeniería Electrónica y Automática de varias universidades del estado, comprobando que estos titulados pueden no recibir los conocimientos en el ámbito d...

  2. Los Estudiantes de Grado como Creadores de Materiales de Aprendizaje. La Experiencia en Organografía Microscópica Humana

    OpenAIRE

    Álvarez Vázquez, Mª Pilar

    2014-01-01

    En este artículo compartimos parte de nuestra experiencia docente en el curso 2010/11 con los alumnos de una asignatura obligatoria del Grado en Medicina. Pusimos en marcha una serie de iniciativas innovadoras para el desarrollo de metodologías de aprendizaje activo con la ayuda de las nuevas tecnologías (TIC). En concreto los alumnos llevaron a cabo distintas tareas en grupo con vistas a profundizar en la asignatura, las subían al campus virtual, las exponían en clase y evaluaban las de los ...

  3. Efectos sobre microdureza y grado de conversión de dos tipos de resinas sometidas a tratamientos de pospolimerización

    OpenAIRE

    Lapesqueur, Melissa; Surriaga, Patricia; Masache, María Elena; Vásquez, Berenice; Peña, Mauricio; Mongruel Gómes, Osnara María; Domínguez, John Alexis

    2015-01-01

    Objetivo:evaluar la microdureza y el grado de conversión después de diferentes técnicas poscurado en dos tipos de resinas compuestas. Materiales y métodos: se realizaron 36 cuerpos de prueba con 12 mm de diámetro y 4 mm de altura, con dos resinas: Filtek z350 y Ena Miscerium. Después de la confec-ción, los cuerpos de prueba se llevaron al microduremetro y a espectroscopia de infrarrojo, y fueron sometidos a cuatro procesos de pospolimerización: agua en ebullición, microonda, calor seco, autoc...

  4. Estrategias de aprendizaje con relación al rendimiento académico y tiempo en alcanzar el grado universitario en enfermería

    OpenAIRE

    Acevedo Rodríguez, Maritza

    2016-01-01

    En este estudio se analiza la asociación entre el uso de estrategias de aprendizaje, el rendimiento académico y el tiempo de completar el grado en estudiantes de enfermería. Las estrategias de aprendizaje estudiadas fueron las cognitivas, meta-cognitivas y motivacionales. El rendimiento académico se evaluó a través de las siguientes variables; créditos académicos, créditos intentados, créditos aprobados y el índice académico acumulado. Para explorar como las dichas estrategias de aprendizaje ...

  5. 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.

  6. Development of a Linear Flow Channel Reactor for sulphur removal ...

    African Journals Online (AJOL)

    2013-09-23

    Sep 23, 2013 ... in acid mine wastewater treatment operations ... bed reactor treating a synthetic acid mine water (2 000 mg∙ℓ−1 Na2SO4 solution) and the Liner Flow Channel Reactors (sur- face area 1.1 m2 and ... Keywords: floating sulphur biofilms, acid mine drainage, AMD passive treatment, linear flow channel reactor,.

  7. Deposition of TiN films in a batch reactor

    NARCIS (Netherlands)

    Hasper, Albert; Hasper, A.; Snijders, Gert-Jan; Vandezande, Lieve; De Blank, Marinus J.; Bankras, R.G.

    2010-01-01

    Titanium nitride (TiN) films are formed in a batch reactor using titanium chloride (TiCl4) and ammonia (NH3) as precursors. The TiCl4 is flowed into the reactor in temporally separated pulses. The NH3 can also be flowed into the reactor in temporally spaced pulses which alternate with the TiCl4

  8. Deposition of TiN films in a batch reactor

    NARCIS (Netherlands)

    Hasper, A.; Hasper, Albert; Snijders, Gert-Jan; Vandezande, Lieve; De Blank, Marinus J.; Bankras, R.G.

    2006-01-01

    Titanium nitride (TiN) films are formed in a batch reactor using titanium chloride (TiCl4) and ammonia (NH3) as precursors. The TiCl4 is flowed into the reactor in temporally separated pulses. The NH3 can also be flowed into the reactor in temporally spaced pulses which alternate with the TiCl4

  9. Choice of coils for a fusion reactor

    Science.gov (United States)

    Alexander, Romeo; Garabedian, Paul R.

    2007-01-01

    In a fusion reactor a hot plasma of deuterium and tritium is confined by a strong magnetic field to produce helium ions and release energetic neutrons. The 3D geometry of a stellarator provides configurations for such a device that reduce net toroidal current that might lead to disruptions. We construct smooth coils generating an external magnetic field designed to prevent the plasma from deteriorating. PMID:17640879

  10. La entrevista cualitativa como instrumento para el desarrollo y evaluación de competencias en el Grado de Enfermería

    OpenAIRE

    Gatell Maza, Paz; Moreno Preciado, Manuel

    2014-01-01

    En la asignatura de Investigación Cualitativa (2º, Grado de Enfermería) se explica y desarrolla la enseñanza de “la entrevista cualitativa” como técnica central en el proceso de recogida de datos. Para que los estudiantes puedan asimilar este conocimiento se propone el desarrollo de una dinámica grupal, recogida en el sistema de evaluación como “Actividad 1”. Se pretende que el estudiante además alcance aprender y desarrollar algunas de las competencias transversales que la asi...

  11. 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…

  12. 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…

  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. Method of Operating a Neutronic Reactor

    Science.gov (United States)

    Fermi, Enrico; Szilard, Leo

    This Patent is a later,1 almost faithful, copy of Patent No. 2,708,656 (which is then not reported in the present volume). This revised version was probably prepared (by the authors) in order to correct several misprints of the previous version. As emphasized in The New York Times of May 19, 1955, Patent No. 2,708,656, an "historic Patent, covering the first nuclear reactor", is the first one on this topic issued by the U.S. Patent Office, and served as a reference for the subsequent Patents on the same subject. In this long Patent, the theory, exper- imental data and principles of construction and operation of "any" type of nuclear reactor known at that time are discussed in an extremely detailed way. Various possible fission fragments produced by the reactor, several forms of the uranium employed (metal, oxide and so on, grouped in different geometrical forms), various materials adopted as moderators, several cooling systems, different geometries of the reactors, etc. are considered accurately. The theoretical description, centered around the achievement of a self-sustaining chain reaction, is exhaustive, and great attention is devoted to any possible cause of neutron loss, to the resonance capture of neutrons and to the effect of the presence of relevant impurities in the reactor. The chain production of neutrons in the pile is described in great detail, along with the theoretical arguments underlying the exponential experiment. The problem of the variation of the multiplication factor due to the production of radioactive elements, such as xenon, is discussed extensively. In particular it is pointed out that, although the initial production of xenon lowers the multiplication factor K due to its relevant neutron absorption, it subsequently increases again due to the decay of xenon into another isotope which absorbs fewer neutrons. The building up of reactors with solid (graphite) or liquid (heavy water) moderators is discussed, as well as other possible

  15. PISA for Schools: Topological Rationality and New Spaces of the OECD's Global Educational

    Science.gov (United States)

    Lewis, Steven; Sellar, Sam; Lingard, Bob

    2016-01-01

    This article examines the OECD's new PISA-based Test for Schools ("PISA for Schools") program. PISA for Schools is part of the expanding education work of the OECD, building upon main PISA to enable school-to-schooling system comparisons. We examine the development of PISA for Schools, the nature of the instrument, and some initial…

  16. Muon trackers for imaging a nuclear reactor

    Science.gov (United States)

    Kume, N.; Miyadera, H.; Morris, C. L.; Bacon, J.; Borozdin, K. N.; Durham, J. M.; Fuzita, K.; Guardincerri, E.; Izumi, M.; Nakayama, K.; Saltus, M.; Sugita, T.; Takakura, K.; Yoshioka, K.

    2016-09-01

    A detector system for assessing damage to the cores of the Fukushima Daiichi nuclear reactors by using cosmic-ray muon tomography was developed. The system consists of a pair of drift-tube tracking detectors of 7.2× 7.2-m2 area. Each muon tracker consists of 6 x-layer and 6 y-layer drift-tube detectors. Each tracker is capable of measuring muon tracks with 12 mrad angular resolutions, and is capable of operating under 50-μ Sv/h radiation environment by removing gamma induced background with a novel time-coincidence logic. An estimated resolution to observe nuclear fuel debris at Fukushima Daiichi is 0.3 m when the core is imaged from outside the reactor building.

  17. 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.

  18. 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.

  19. Evidence-based recommendations for PISA measurements in mitral regurgitation: systematic review, clinical and in-vitro study.

    Science.gov (United States)

    Moraldo, Michela; Cecaro, Fabrizio; Shun-Shin, Matthew; Pabari, Punam A; Davies, Justin E; Xu, Xiao Y; Hughes, Alun D; Manisty, Charlotte; Francis, Darrel P

    2013-09-30

    Guidelines for quantifying mitral regurgitation (MR) using "proximal isovelocity surface area" (PISA) instruct operators to measure the PISA radius from valve orifice to Doppler flow convergence "hemisphere". Using clinical data and a physically-constructed MR model we (A) analyse the actually-observed colour Doppler PISA shape and (B) test whether instructions to measure a "hemisphere" are helpful. In part A, the true shape of PISA shells was investigated using three separate approaches. First, a systematic review of published examples consistently showed non-hemispherical, "urchinoid" shapes. Second, our clinical data confirmed that the Doppler-visualized surface is non-hemispherical. Third, in-vitro experiments showed that round orifices never produce a colour Doppler hemisphere. In part B, six observers were instructed to measure hemisphere radius rh and (on a second viewing) urchinoid distance (du) in 11 clinical PISA datasets; 6 established experts also measured PISA distance as the gold standard. rh measurements, generated using the hemisphere instruction significantly underestimated expert values (-28%, pPISA distance was found to have a coefficient of variation (CV) of 25% in patients and 9% in in-vitro data. Beat-to-beat variability had a CV of 15% in patients. Doppler-visualized PISA shells are not hemispherical: we should avoid advising observers to measure a hemispherical radius because it encourages underestimation of orifice area by approximately two-fold. If precision is needed (e.g. to detect changes reliably) multi-frame averaging is essential. Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.

  20. Medical Radioisotopes Production Without A Nuclear Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Van der Keur, H.

    2010-05-15

    This report is answering the key question: Is it possible to ban the use of research reactors for the production of medical radioisotopes? Chapter 2 offers a summarized overview on the history of nuclear medicine. Chapter 3 gives an overview of the basic principles and understandings of nuclear medicine. The production of radioisotopes and its use in radiopharmaceuticals as a tracer for imaging particular parts of the inside of the human body (diagnosis) or as an agent in radiotherapy. Chapter 4 lists the use of popular medical radioisotopes used in nuclear imaging techniques and radiotherapy. Chapter 5 analyses reactor-based radioisotopes that can be produced by particle accelerators on commercial scale, other alternatives and the advantages of the cyclotron. Chapter 6 gives an overview of recent developments and prospects in worldwide radioisotopes production. Chapter 7 presents discussion, conclusions and recommendations, and is answering the abovementioned key question of this report: Is it possible to ban the use of a nuclear reactor for the production of radiopharmaceuticals? Is a safe and secure production of radioisotopes possible?.

  1. 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.

  2. APROXIMACIÓN A LAS CONCEPCIONES ACERCA DE DIVERSIDAD VEGETAL EN ESTUDIANTES DE OCTAVO GRADO DE LA INSTITUCIÓN EDUCATIVA EUGENIO FERRO FALLA, CAMPOALEGRE, HUILA

    Directory of Open Access Journals (Sweden)

    María Alejandra Guarnizo Losada

    2014-05-01

    Full Text Available A continuación presentamos la propuesta sobre las aproximaciones a las concepciones acerca de diversidad vegetal en estudiantes de Octavo grado de la Institución Educativa Eugenio Ferro Falla, Campoalegre, Huila, desarrollada en el interior del Grupo de Investigación y Pedagogía en Biodiversidad y el semillero Mamakiwe adscrito al programa de Licenciatura en Ciencias Naturales y Educación Ambiental de la Universidad Surcolombiana de Neiva. Presentamos una investigación realizada sobre las aproximaciones que tienen los estudiantes de básica Secundaria especialmente de grado octavo de una Institución Educativa sobre el concepto de Diversidad Vegetal, permitiendo establecer 3 tendencias, aquellas indican sobre lo que los estudiantes, mediante su diario vivir, sus aprendizajes dentro y fuera del aula, y sus gustos, entienden por Diversidad Vegetal; estas jerarquías se definieron a partir de las respuestas que arrojó un cuestionario que fue aplicado a los estudiantes, y se definieron las siguientes categorías: “Diversidad como diferentes plantas”, “Diversidad como presencia de Plantas” y “Diversidad como desarrollo de la planta”.

  3. Safety requirements, facility user needs, and reactor concepts for a new Broad Application Test Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Ryskamp, J.M. [ed.; Liebenthal, J.L.; Denison, A.B.; Fletcher, C.D.

    1992-07-01

    This report describes the EG&G Laboratory Directed Research and Development Program (LDRD) Broad Application Test Reactor (BATR) Project that was conducted in fiscal year 1991. The scope of this project was divided into three phases: a project process definition phase, a requirements development phase, and a preconceptual reactor design and evaluation phase. Multidisciplinary teams of experts conducted each phase. This report presents the need for a new test reactor, the project process definition, a set of current and projected regulatory compliance and safety requirements, a set of facility user needs for a broad range of projected testing missions, and descriptions of reactor concepts capable of meeting these requirements. This information can be applied to strategic planning to provide the Department of Energy with management options.

  4. Safety requirements, facility user needs, and reactor concepts for a new Broad Application Test Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Ryskamp, J.M. (ed.); Liebenthal, J.L.; Denison, A.B.; Fletcher, C.D.

    1992-07-01

    This report describes the EG G Laboratory Directed Research and Development Program (LDRD) Broad Application Test Reactor (BATR) Project that was conducted in fiscal year 1991. The scope of this project was divided into three phases: a project process definition phase, a requirements development phase, and a preconceptual reactor design and evaluation phase. Multidisciplinary teams of experts conducted each phase. This report presents the need for a new test reactor, the project process definition, a set of current and projected regulatory compliance and safety requirements, a set of facility user needs for a broad range of projected testing missions, and descriptions of reactor concepts capable of meeting these requirements. This information can be applied to strategic planning to provide the Department of Energy with management options.

  5. Hva skjer i naturfagklasserommet? – resultater fra en videobasert klasseromsstudie; PISA+

    Directory of Open Access Journals (Sweden)

    Marianne Ødegaard

    2010-04-01

    Full Text Available The aim of the PISA+ project is to pursue problematic findings in the international PISA survey. Through in-depth studies of classroom processes we wish to gain insight in how to understand and interpret the Norwegian results. The PISA+ project is a qualitative video study using observations and interviews. It includes six ninth grade classes followed for three weeks each in math, Norwegian and science. This paper focuses on the science lessons, and seeks to scrutinize which learning activities thestudents are offered, how the students can influence the lessons and to which extent they can learn science through own experience and talking science. We conclude that science teachers are quite open to student initiatives, and that the dominating learning activity is going through new subject matter in dialogue with the students. However, we saw very little inquiry science where students used practical experiments as a basis to actively talk science.

  6. Boiling water neutronic reactor incorporating a process inherent safety design

    Science.gov (United States)

    Forsberg, C.W.

    1985-02-19

    A boiling-water reactor core is positioned within a prestressed concrete reactor vessel of a size which will hold a supply of coolant water sufficient to submerge and cool the reactor core by boiling for a period of at least one week after shutdown. Separate volumes of hot, clean (nonborated) water for cooling during normal operation and cool highly borated water for emergency cooling and reactor shutdown are separated by an insulated wall during normal reactor operation with contact between the two water volumes being maintained at interfaces near the top and bottom ends of the reactor vessel. Means are provided for balancing the pressure of the two water volumes at the lower interface zone during normal operation to prevent entry of the cool borated water into the reactor core region, for detecting the onset of excessive power to coolant flow conditions in the reactor core and for detecting low water levels of reactor coolant. Cool borated water is permitted to flow into the reactor core when low reactor coolant levels or excessive power to coolant flow conditions are encountered.

  7. Eight Grade Students’ Epistemological Beliefs with PISA Success and their Scientific Literacy

    Directory of Open Access Journals (Sweden)

    Alper SADIÇ

    2015-06-01

    Full Text Available The purpose of the study is to investigate the relationship between students’ scientific literacy, obtained by PISA scores and their scientific epistemological beliefs (SEB. The sample was 104 eight grade students. The instruments of the study were Scientific Epistemological Beliefs Questionnaire and conceptual test, prepared by PISA questions. The result of the study demonstrated that students’ scores on conceptual understanding and SEB are moderate level. There is no significant relationship between students’ SEB and their conceptual understanding. However, there is a significant relationship between students’ some dimensions of SEB and some PISA questions. Also, there is no statistically significant difference between students SEB and their gender. However, boys, except justifiation dimension, have higher score than girls on other SEB.

  8. Diseño de reactores heterogéneos

    OpenAIRE

    Conesa Ferrer, Juan Antonio

    2001-01-01

    Esta es una versión revisada de la publicación: Reactores heterogéneos / Juan A. Conesa Ferrer, Rafael Font Montesinos. San Vicente del Raspeig : Publicaciones de la Universidad de Alicante, 2001. ISBN 84-7908-652-1, 230 p. Texto dedicado al diseño de reactores heterogéneos.

  9. DDT in human milk and mental capacities in children at school age: an additional view on PISA 2000.

    Science.gov (United States)

    Dörner, Günter; Plagemann, Andreas

    2002-01-01

    To investigate a possible lasting impact of dichlorodiphenyl trichloroethane (DDT) exposure in neonatal life on mental capacities in later life. Relationships were evaluated by correlation and regression analysis between total DDT concentrations in human breast milk in the years of birth (1984/1985) and measurements of mental capacities obtained in pupils of the PISA 2000 studies as well as percentages of backward children in Germany in 1994/95. Comparing total DDT levels in human milk during the years of birth (1984/85) evaluable for eleven PISA countries with assessed mental capacities of 15-year-old pupils of PISA International, a significant inverse correlation was found (p milk in 1984/85 in ten foreign countries of three continents plus fourteen Federal States of Germany and the mental capacities of 15 year-old pupils of PISA International plus PISA National (Germany) 2000. Finally, a significant positive correlation was observed between total DDT contents in human milk in 1984/85 and the percentages of backward school children in 1994/95 in Federal States of Germany (p harmful effects on brain development and mental capacities in later life. Thus, a neuroendocrine prophylaxis during critical developmental periods in early life as recommended by our group since many years appears to be most important for primary preventive medicine but even for "preventive pedagogics". The validity of these theses should be re-tested in future PISA studies.

  10. Comparativa de competencias exigidas en el Prácticum en el Grado de Enfermería en España y Portugal

    OpenAIRE

    García García, María

    2016-01-01

    La Unión Europea en su objetivo de alcanzar una homogeneidad en materia de educación concibió el Plan Bolonia con el fin de conseguir una formación académica unánime. En este contexto se creó el Espacio Europeo de Educación Superior (EEES), con el propósito de fomentar la movilidad internacional. Como consecuencia España modificó sus estudios de Enfermería convirtiendo la Diplomatura en Enfermería en Grado y Portugal hizo lo propio, convirtiendo la Diplomatura en Licenciatura. En los países e...

  11. APROXIMACIONES A LAS CONCEPCIONES EN TORNO A LOS MURCIELAGOS EN ESTUDIANTES DEL GRADO OCTAVO DE LA INSTITUCIÓN EDUCATIVA TÉCNICO SUPERIOR DE NEIVA

    Directory of Open Access Journals (Sweden)

    Santiago Rivera Losada

    2015-12-01

    Full Text Available Presentamos resultados preliminares de la investigación Diseño y aplicación de una unidad didáctica para la enseñanza sobre los murciélagos en estudiantes del grado octavo de la Institución Educativa Técnico Superior de Neiva, desarrollada al interior del Programa de Licenciatura en Ciencias Naturales: Física, Química, Biología de la Universidad Surcolombiana (Neiva-Hulla;  para este caso nos referimos particularmente a las concepciones de los estudiantes sobre este grupo de organismos. El estudio fue realizado desde una perspectiva cualitativa,   empleamos el método de análisis de contenido a través del software ATLAS. Ti 7.0 y recolectamos la información por medio de cuestionarios, encuestas y observaciones de clase a un grupo de octavo grado que consistía en 38 estudiantes con edades entre 13 y 16 años. Específicamente con base en los resultados  de la aplicación del cuestionario al inicio del proceso formativo destacamos que las concepciones  en la gran mayoría han sido alimentadas por la mala fama que le ha creado su aparente relación con los “vampiros” de las películas y sus mitos populares; un porcentaje muy alto presenta desconocimiento de las características biológicas de los quirópteros, la mayoría del estudiantado  desconoce el papel de estos organismos  en el ecosistema y por consiguiente no consideran importante su conservación.

  12. 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...

  13. 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.

  14. 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.

  15. Methodology for the integral comparison of nuclear reactors: selecting a reactor for Mexico; Metodologia para la comparacion integral de reactores nucleares: seleccion de un reactor para Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Reyes R, R.; Martin del Campo M, C. [UNAM, Facultad de Ingenieria, Laboratorio de Analisis de Ingenieria de Reactores Nucleares, Paseo Cuauhnahuac 8532, 62550 Jiutepec, Morelos (Mexico)]. e-mail: ricarera@yahoo.com.mx

    2006-07-01

    In this work it was built a methodology to compare nuclear reactors of third generation that can be contemplated for future electric planning in Mexico. This methodology understands the selection of the reactors to evaluate eliminating the reactors that still are not sufficiently mature at this time of the study. A general description of each reactor together with their main ones characteristic is made. It was carried out a study for to select the group of parameters that can serve as evaluation indicators, which are the characteristics of the reactors with specific values for each considered technology, and it was elaborated an evaluation matrix indicators including the reactors in the columns and those indicators in the lines. Since that none reactor is the best in all the indicators were necessary to use a methodology for multi criteria taking decisions that we are presented. It was used the 'Fuzzy Logic' technique, the which is based in those denominated diffuse groups and in a system of diffuse inference based on heuristic rules in the way 'If Then consequence> ', where the linguistic values of the condition and of the consequence is defined by diffuse groups, it is as well as the rules always they transform a diffuse group into another. Later on they combine all the diffuse outputs to create a single output and an inverse transformation is made that it transfers the output from the diffuse domain to the real one. They were carried out two studies one with the entirety of the indicators and another in which the indicators were classified in three approaches: the first one refers to indicators related with the planning of the plants inside the context of the general electric sector, the second approach includes indicators related with the characteristics of the fuel and the third it considers indicators related with the acting of the plant in safety and environmental impact. This second study allowed us to know the qualities of

  16. 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.

  17. 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.

  18. 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.

  19. Chemical looping combustion in a rotating bed reactor--finding optimal process conditions for prototype reactor.

    Science.gov (United States)

    Håkonsen, Silje Fosse; Blom, Richard

    2011-11-15

    A lab-scale rotating bed reactor for chemical looping combustion has been designed, constructed, and tested using a CuO/Al(2)O(3) oxygen carrier and methane as fuel. Process parameters such as bed rotating frequency, gas flows, and reactor temperature have been varied to find optimal performance of the prototype reactor. Around 90% CH(4) conversion and >90% CO(2) capture efficiency based on converted methane have been obtained. Stable operation has been accomplished over several hours, and also--stable operation can be regained after intentionally running into unstable conditions. Relatively high gas velocities are used to avoid fully reduced oxygen carrier in part of the bed. Potential CO(2) purity obtained is in the range 30 to 65%--mostly due to air slippage from the air sector--which seems to be the major drawback of the prototype reactor design. Considering the prototype nature of the first version of the rotating reactor setup, it is believed that significant improvements can be made to further avoid gas mixing in future modified and up-scaled reactor versions.

  20. The Relationship between ICT Use and Science Knowledge for Czech Students: A Secondary Analysis of PISA 2006

    Science.gov (United States)

    Kubiatko, Milan; Vlckova, Katerina

    2010-01-01

    The 2006 Programme for International Student Assessment focussed on students' scientific competencies, measured their knowledge and provided questionnaires focussed on different aspects of life. One aspect was students' experience with information and communication technology (ICT). A secondary analysis of variance of the Czech Republic data (N =…

  1. Collective control of a nuclear reactor

    Energy Technology Data Exchange (ETDEWEB)

    Rognin, L.

    1995-06-01

    Nowadays, mainly related to the increasing complexity of working environments, working activities become more and collective. The present research on the paradoxical nature of working teams, considered from a reliability point of view. This document is composed of four Sections. The first Section introduces the context of the research, its objectives and the underlying assumptions. In the second Section, we describe a working situation, which is the control of a nuclear reactor. Relations between cooperative work and reliability are discussed in the third Section. Finally, in the fourth Section, a synthesis of the research and some perspectives are proposed. (authors). 7 refs.

  2. Trabajo de grado emprendimiento

    OpenAIRE

    Herrera Torres, Jinna Paola; León Velandia, María Camila

    2017-01-01

    Santalicia nace fruto del emprendimiento de dos estudiantes de la Universidad del Rosario, María Camila León Velásquez y Jinna Herra, quienes en el 2015 se dieron cuenta que la mayoría de las personas no se sentían satisfechas con su alimentación, puesto que cada vez que consumían ciertos alimentos sentían un remordimiento y un cargo de conciencia por hacerlo, a ello se le sumaba el hecho de que comer saludable fuera más que un cambio un reto o un desafío para ellos. Es allí donde surge...

  3. Hvor langt er PISA fra Danmark?

    DEFF Research Database (Denmark)

    Dolin, Jens; Krogh, Lars Brian

    2008-01-01

    I Danmark, såvel som i andre lavtplacerede lande, har PISA haft omfattende mediedækning, og de politiske konsekvenser har været betydelige. Væsentligst i denne sammenhæng er formentlig indførelsen af nationale tests i dansk/læsning, matematik og samtlige naturfag – og med stort fokus på samme ald...

  4. A generalized perturbation program for CANDU reactor

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Do Heon; Kim, Jong Kyung [Hanyang University, Seoul (Korea, Republic of); Choi, Hang Bok; Roh, Gyu Hong [Korea Atomic Energy Research Institute, Taejon (Korea, Republic of); Yang, Won Sik [Chosun University, Kwangju (Korea, Republic of)

    1998-12-31

    A generalized perturbation program has been developed for the purpose of estimating zonal power variation of a CANDU reactor upon refueling operation. The forward and adjoint calculation modules of RFSP code were used to construct the generalized perturbation program. The numerical algorithm for the generalized adjoint flux calculation was verified by comparing the zone power estimates upon refueling with those of forward calculation. It was, however, noticed that the truncation error from the iteration process of the generalized adjoint flux is not negligible. 2 refs., 1 figs., 1 tab. (Author)

  5. Fail-safe reactivity compensation method for a nuclear reactor

    Energy Technology Data Exchange (ETDEWEB)

    Nygaard, Erik T.; Angelo, Peter L.; Aase, Scott B.

    2018-01-23

    The present invention relates generally to the field of compensation methods for nuclear reactors and, in particular to a method for fail-safe reactivity compensation in solution-type nuclear reactors. In one embodiment, the fail-safe reactivity compensation method of the present invention augments other control methods for a nuclear reactor. In still another embodiment, the fail-safe reactivity compensation method of the present invention permits one to control a nuclear reaction in a nuclear reactor through a method that does not rely on moving components into or out of a reactor core, nor does the method of the present invention rely on the constant repositioning of control rods within a nuclear reactor in order to maintain a critical state.

  6. O PISA PARA O DESENVOLVIMENTO E O SACRIFÍCIO DE DADOS COM RELEVÂNCIA POLÍTICA

    Directory of Open Access Journals (Sweden)

    Camilla Addey

    Full Text Available RESUMO: Este artigo examina como o PISA vem sendo alargado de modo a incluir países de 'renda baixa e média', e levanta questões sobre a importância do teste em tais contextos e sobre a sua pretensão de produzir dados politicamente mais relevantes. O artigo começa por apresentar a história do PISA para o Desenvolvimento (PISA-D e, depois, discute como este programa é negociado enquanto instrumento de política. Com base na noção de 'comunidade epistémica' (Haas, 1992, bem como na semiótica sócio-material (Law, 2008, este artigo analisa entrevistas sobre o PISA-D realizadas com atores da OCDE, da The Learning Bar (uma empresa privada e, ainda, com atores políticos de alto nível do Equador e do Paraguai (dois países PISA-D. Ao debruçar-se sobre o processo de negociação em função do qual se estabeleceu o 'limiar de relevância política' do PISA-D, o artigo revela os múltiplos interesses envolvidos. Ao fazê-lo, o artigo põe em questão a reivindicação da relevância política do PISA-D e argumenta que a aceitação do 'limiar de relevância política' do PISA-D é determinada pelo compromisso com a 'comunidade epistêmica do PISA' (Bloem 2015. O artigo conclui questionando o que significa 'relevância política' no mundo PISA. Em tempos de 'governança epistemológica' (Sellar e Lingard 2013, a comunidade mundial da educação global parece ter deslocado a sua atenção dos conhecimentos são relevantes para a política para os conhecimento que contam para a política.

  7. Conduction heat transfer in a cylindrical dielectric barrier discharge reactor

    Energy Technology Data Exchange (ETDEWEB)

    Sadat, H. [Laboratoire d' Etudes Thermiques, Universite de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers (France)], E-mail: hamou.sadat@univ-poitiers.fr; Dubus, N. [Laboratoire d' Etudes Thermiques, Universite de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers (France); Pinard, L.; Tatibouet, J.M.; Barrault, J. [Laboratoire en catalyse et chimie organique, Universite de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers (France)

    2009-04-15

    The thermal behaviour of a dielectric barrier discharge reactor is studied. The experimental tests are performed on a laboratory reactor with two working fluids: helium and air. A simple heat conduction model for calculating the heat loss is developed. By using temperature measurements in the internal and external electrodes, a thermal resistance of the reactor is defined. Finally, the percentage of the input power that is dissipated to the environment is given.

  8. Seguridad en anestesiología y reanimación: Medicación de alto riesgo. Almacenamiento, grado de conocimiento y efecto de una intervención docente.

    OpenAIRE

    Pérez Caballero, Paula

    2015-01-01

    Hipótesis y objetivos. En hospitales sin una cultura de seguridad, el almacenamiento de medicación de alto riesgo (MAR) en áreas de especial riesgo, no sigue recomendaciones de seguridad, lo cual podría causar errores (primera hipótesis). El grado de conocimiento de este tipo de medicación por los profesionales podría ser limitado (segunda hipótesis). Objetivo principal (primera hipótesis): detectar la presencia y grado de accesibilidad a MAR en áreas en que puede inducir a error. Objetiv...

  9. Utilización de tinta digital para favorecer la implantación de una signatura del grado en Ingeniería Informática

    OpenAIRE

    Más-Estellés, Jorge; Benlloch-Dualde, José Vicente

    2011-01-01

    La experiencia ha consistido en la utilización de Tablets PC en una clase de ejercicios de teoría de circuitos, y en el uso de tinta digital para la revisión, tanto de ejercicios propuestos a los alumnos, como de memorias de prácticas de laboratorio. La experiencia ha sido llevada a cabo en un grupo de alto rendimiento y docencia en inglés, en el primer año de impartición del Grado en Ingeniería Informática. El trabajo se centra en la descripción de cómo se ha...

  10. La Competencia Matemática en PISA (Mathematics Competence in PISA

    Directory of Open Access Journals (Sweden)

    Luis Rico

    2007-01-01

    Full Text Available En este documento describo las principales componentes del marco teórico del proyecto PISA/OCDE analizando para ello la noción de alfabetización matemática, las diferentes variables que componen el dominio, las variables que organizan los instrumentos de evaluación, y los diferentes significados del término competencia.In this work I describe the PISA/OECD project framework main components. For this purpose, I analyze the notion of mathematical literacy, the different variables of the domain, the variables of the assessment instruments, and the different meanings of competency.

  11. Selective distribution of enzymes in a microfluidic reactor

    DEFF Research Database (Denmark)

    Daugaard, Anders Egede; Pereira Rosinha Grundtvig, Ines; Krühne, Ulrich

    Off stoichiometric thiol-ene mixtures are well suited for preparation of microfluidic devices with highly functional surfaces. Here a two stage process employing first thiol-ene chemistry (TEC) to prepare two opposite parts of a microfluidic system with a 30x30 mm reactor and subsequently a thiol......-epoxy bonding was used to prepare a fully sealed microfluidic system. The reactor was surface functionalized in-situ with allyl glycidyl ether in different patterns (half-reactor, full-reactor, checkerboard structures) on the surface to provide a controlled distribution of epoxides. The method additionally...

  12. 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...

  13. Review of antiviral and immunomodulating properties of plants of the Peruvian rainforest with a particular emphasis on Una de Gato and Sangre de Grado.

    Science.gov (United States)

    Williams, J E

    2001-12-01

    Viral diseases, including emerging and chronic viruses, are an increasing worldwide health concern. As a consequence, the discovery of new antiviral agents from plants has assumed more urgency than in the past. A number of native Amazonian medicines of plant origin are known to have antimicrobial and anti-inflammatory activity, although only a few have been studied for their antiviral properties and immunomodulating effects. Those most studied include: Sangre de Grado (drago) (Croton lechleri) in the Euphorbiaceae family and Una de Gato (Uncaria tomentosa) in the Rubiaceae family. This article reviews the chemical composition, pharmacological properties, state of current research, clinical use, and potential antiviral and immunomodulating activity of these and other plants from the Peruvian Amazon.

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

    OpenAIRE

    Salin Polania Polo; Ligia Beatriz Arévalo Malagón

    2015-01-01

    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 p...

  15. 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.

  16. Construcción de una guía didáctica sobre fuerza centrífuga para estudiantes de ciclo V de grado 10

    OpenAIRE

    Acosta Gómez, Víctor Manuel

    2014-01-01

    El presente trabajo propone el diseño de una guía didáctica y aplicación de la misma, para la enseñanza de los conceptos fundamentales de Fuerza, Sistema de Referencia y principalmente el de fuerza centrífuga. Se tiene el propósito de mejorar la interpretación, comprensión y nivel de desempeño en la comprensión de fuerzas inerciales (Centrífuga), en los estudiantes de grado décimo y de ser posible cualquier otro nivel de educación superior. El diseño de la guía se realizó teniendo en cuenta u...

  17. 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.

  18. Plasma nitriding monitoring reactor: A model reactor for studying plasma nitriding processes using an active screen

    Science.gov (United States)

    Hamann, S.; Börner, K.; Burlacov, I.; Spies, H.-J.; Strämke, M.; Strämke, S.; Röpcke, J.

    2015-12-01

    A laboratory scale plasma nitriding monitoring reactor (PLANIMOR) has been designed to study the basics of active screen plasma nitriding (ASPN) processes. PLANIMOR consists of a tube reactor vessel, made of borosilicate glass, enabling optical emission spectroscopy (OES) and infrared absorption spectroscopy. The linear setup of the electrode system of the reactor has the advantages to apply the diagnostic approaches on each part of the plasma process, separately. Furthermore, possible changes of the electrical field and of the heat generation, as they could appear in down-scaled cylindrical ASPN reactors, are avoided. PLANIMOR has been used for the nitriding of steel samples, achieving similar results as in an industrial scale ASPN reactor. A compact spectrometer using an external cavity quantum cascade laser combined with an optical multi-pass cell has been applied for the detection of molecular reaction products. This allowed the determination of the concentrations of four stable molecular species (CH4, C2H2, HCN, and NH3). With the help of OES, the rotational temperature of the screen plasma could be determined.

  19. 77 FR 15799 - Notice of Intent To Repatriate a Cultural Item: San Francisco State University, San Francisco, CA

    Science.gov (United States)

    2012-03-16

    ... Boland Fentress, San Francisco State University, Academic Affairs-ADM 447, San Francisco, CA 94132... identity that can be reasonably traced between the basket and the Santa Rosa Indian Community of the Santa..., San Francisco State University, Academic Affairs-ADM 447, San Francisco, CA 94132, telephone (415) 338...

  20. Using thermal balance model to determine optimal reactor volume and insulation material needed in a laboratory-scale composting reactor.

    Science.gov (United States)

    Wang, Yongjiang; Pang, Li; Liu, Xinyu; Wang, Yuansheng; Zhou, Kexun; Luo, Fei

    2016-04-01

    A comprehensive model of thermal balance and degradation kinetics was developed to determine the optimal reactor volume and insulation material. Biological heat production and five channels of heat loss were considered in the thermal balance model for a representative reactor. Degradation kinetics was developed to make the model applicable to different types of substrates. Simulation of the model showed that the internal energy accumulation of compost was the significant heat loss channel, following by heat loss through reactor wall, and latent heat of water evaporation. Lower proportion of heat loss occurred through the reactor wall when the reactor volume was larger. Insulating materials with low densities and low conductive coefficients were more desirable for building small reactor systems. Model developed could be used to determine the optimal reactor volume and insulation material needed before the fabrication of a lab-scale composting system. Copyright © 2016 Elsevier Ltd. All rights reserved.

  1. Parental Involvement in Selected PISA Countries and Economies. OECD Education Working Papers, No. 73

    Science.gov (United States)

    Borgonovi, Francesca; Montt, Guillermo

    2012-01-01

    Studies have highlighted the beneficial effects of parental involvement in children's educational lives. Few studies, however, analyse parental involvement in a cross-national perspective and few evaluate a wide array of forms of involvement. In 2009, 14 countries and economies implemented the parental questionnaire option in the PISA 2009 cycle.…

  2. Correcting for Sample Problems in PISA and the Improvement in Portuguese Students' Performance

    Science.gov (United States)

    Freitas, Pedro; Nunes, Luís Catela; Balcão Reis, Ana; Seabra, Carmo; Ferro, Adriana

    2016-01-01

    The results of large-scale international assessments such as Programme for International Student Assessment (PISA) have attracted a considerable attention worldwide and are often used by policy-makers to support educational policies. To ensure that the published results represent the actual population, these surveys go through a thorough scrutiny…

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

    Energy Technology Data Exchange (ETDEWEB)

    Thiyagarajan, P.; Littrell, K. [Intense Pulsed Neutron Source, Argonne National Laboratory, IL (United States); Seeger, P.A.

    2001-03-01

    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{sup -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 {lambda}>1 A, by 2.3deg away from the direct beam containing high energy neutrons and {gamma} rays. The effects of various collimation choices on count rate, resolution and Q{sub 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)

  4. 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...

  5. Students' Test Motivation in PISA: The Case of Norway

    Science.gov (United States)

    Hopfenbeck, Therese N.; Kjaernsli, Marit

    2016-01-01

    Do students make their best effort in large-scale assessment studies such as the "Programme for International Student Assessment" (PISA)? Despite six cycles of PISA surveys from 2000 to 2015, empirical studies regarding students' test motivation and experience of the tests are sparse. The present study examines students' test motivation…

  6. Comparing OECD Educational Models through the Prism of PISA

    Science.gov (United States)

    Bulle, Nathalie

    2011-01-01

    The PISA survey influences educational policies through an international competitive process which is not wholly rationally-oriented. Firstly, PISA league tables act normatively upon the definition of formal educational aims while the survey tests cannot evaluate the educational systems' relative strengths with regards to such aims. We argue that…

  7. K-12 Education in Germany: Curriculum and PISA 2015

    Science.gov (United States)

    Atmacasoy, Abdullah

    2017-01-01

    Against the backdrop of PISA 2015 results, the aim of this study is to review basic structures of German education system by exploring curriculum development process, key features of each educational level and teacher education in order to grasp how Germany has amended her poor performance after PISA 2000 and persistently improved the quality of…

  8. Inequality of Opportunity for Educational Achievement in Latin America: Evidence from PISA 2006-2009

    Science.gov (United States)

    Gamboa, Luis Fernando; Waltenberg, Fabio D.

    2012-01-01

    We evaluate how far away six Latin American countries stand from a normative goal of equality of opportunity for educational achievement in PISA 2006-2009. We work with alternative characterizations of types: gender, school type (public or private), parental education, and their combinations. Following Checchi-Peragine's (2010) non-parametric…

  9. The Contribution of PISA to the Convergence of Education Policies in Europe

    Science.gov (United States)

    Michel, Alain

    2017-01-01

    The international comparative studies on students' outcomes have initiated analyses that have had a growing influence on national and sub-national education policies in industrialised and developing countries. It is particularly the case of the OECD's Programme for International Student Assessment (PISA) which started in 2000 and has organised…

  10. Are Students More Engaged When Schools Offer Extracurricular Activities? PISA in Focus. No. 18

    Science.gov (United States)

    OECD Publishing (NJ1), 2012

    2012-01-01

    Are students more engaged and do they perform better in science if their school encourages them to work on science projects, participate in science fairs, belong to a science-related club or go on science-related field trips--in addition to teaching them the mandatory science curriculum? To find out, PISA (Programme for International Student…

  11. 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…

  12. Finland and Singapore in PISA 2009: Similarities and Differences in Achievements and School Management

    Science.gov (United States)

    Soh, Kaycheng

    2014-01-01

    In PISA 2009, Finland and Singapore were both ranked high among the participating nations and have caught much attention internationally. However, a secondary analysis of the means for Reading achievement show that the differences are rather small and are attributable to spurious precision. Hence, the two nations should be considered as being on…

  13. Full-Scale Continuous Mini-Reactor Setup for Heterogeneous Grignard Alkylation of a Pharmaceutical Intermediate

    DEFF Research Database (Denmark)

    Pedersen, Michael Jønch; Holm, Thomas; Rahbek, Jesper P.

    2013-01-01

    A reactor setup consisting of two reactors in series has been implemented for a full-scale, heterogeneous Grignard alkylation. Solutions pass from a small filter reactor into a static mixer reactor with multiple side entries, thus combining continuous stirred tank reactor (CSTR) and plug flow...

  14. Design of a TOF-SANS instrument for the proposed Long Wavelength Target Station at the Spallation Neutron Source.

    Energy Technology Data Exchange (ETDEWEB)

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

    2000-11-28

    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 0.001 to 0.7 {angstrom}{sup {minus}1} in a single measurement by simultaneously using neutrons with wavelengths ranging from 1 to 14.5 {angstrom} 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 {lambda} > 1 {angstrom}, by 2.3{degree} away from the direct beam containing high energy neutrons and {gamma} rays. The effects of the supermirror coating of the guide, the location of the bender assembly with respect to the source, the bend angle, and various collimation choices on the flux, resolution and Q{sub 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.

  15. Hispanics of a San Diego Barrio.

    Science.gov (United States)

    1983-04-01

    unacculturated Mexican migrants (mostly from Mexican cities), anomic youth, core youth, as well as acculturated middle class families. It can be a source...There, according to a former Mexicano resident of the area, they were confined to a segregated barrio in "the midst of the cruelest kind of poverty

  16. Convective wave front locking for a reaction-diffusion system in a conical flow reactor

    DEFF Research Database (Denmark)

    Kuptsov, P.V.; Kuznetsov, S.P.; Knudsen, Carsten

    2002-01-01

    We consider reaction-diffusion instabilities in a flow reactor whose cross-section slowly expands with increasing longitudinal coordinate (cone shaped reactor). Due to deceleration of the flow in this reactor, the instability is convective near the inlet to the reactor and absolute at the downstr......We consider reaction-diffusion instabilities in a flow reactor whose cross-section slowly expands with increasing longitudinal coordinate (cone shaped reactor). Due to deceleration of the flow in this reactor, the instability is convective near the inlet to the reactor and absolute...

  17. PISA Test Items and School-Based Examinations in Greece: Exploring the relationship between global and local assessment discourses

    Science.gov (United States)

    Anagnostopoulou, Kyriaki; Hatzinikita, Vassilia; Christidou, Vasilia; Dimopoulos, Kostas

    2013-03-01

    The paper explores the relationship of the global and the local assessment discourses as expressed by Programme for International Student Assessment (PISA) test items and school-based examinations, respectively. To this end, the paper compares PISA test items related to living systems and the context of life, health, and environment, with Greek school-based biology examinations' test items in terms of the nature of their textual construction. This nature is determined by the interplay of the notions of classification (content specialisation) and formality (code specialisation) modulated by both the linguistic and the visual expressive modes. The results of the analysis reveal disparities between assessment discourses promoted at the global and the local level. In particular, while PISA test items convey their scientific message (specialised content and code) principally through their visual mode, the specialised scientific meaning of school-based examinations test is mainly conveyed through their linguistic mode. On the other hand, the linguistic mode of PISA test items is mainly compatible with textual practices of the public domain (non-specialised content and code). Such a mismatch between assessment discourses at local and global level is expected to place Greek students at different discursive positions, promoting different types of knowledge. The expected shift from the epistemic positioning promoted in Greece to the one promoted by PISA could significantly restrict Greek students' ability to infer the PISA discursive context and produce appropriate responses. This factor could provide a meaningful contribution in the discussion of the relatively low achievement of Greek students in PISA scientific literacy assessment.

  18. 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.

  19. 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

  20. METHOD AND APPARATUS FOR CONTROL OF A NUCLEAR REACTOR

    Science.gov (United States)

    Cawley, W.E.

    1962-12-11

    A method and apparatus are described for controlling an overmoderated nuclear reactor containing columns of fuel elements aligned in a plurality of coolant tubes in a stream of coolant water. The invention includes means for adjusting the distance between halves of the fuel element column to vary the relative proportion of fuel and moderator at the center of the reactor. (AEC)

  1. Biological Phosphorus Removal in a Moving Bed Biofilm Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Helness, Herman

    2007-09-15

    The scope of this study was to investigate use of the moving bed biofilm reactor (MBBR) process for biological phosphorus removal. The goal has been to describe the operating conditions required for biological phosphorus and nitrogen removal in a MBBR operated as a sequencing batch reactor (SBR), and determine dimensioning criteria for such a process

  2. A Fixed Bed Barrier Reactor with Separate Feed of Reactants

    NARCIS (Netherlands)

    Neomagus, H.W.J.P.; Saracco, G.; Versteeg, G.F.

    2001-01-01

    A new type of gas-solid reactor was developed and characterised in the series of reactor configurations with separate feed of reactants studied by our group. The novelty in the proposed design lies in the use of a fixed bed of small catalytic particles instead of a porous catalytic membrane. The

  3. A photochemical reactor for studies of atmospheric chemistry

    DEFF Research Database (Denmark)

    Nilsson, Elna Johanna Kristina; Eskebjerg, Carsten; Johnson, Matthew Stanley

    2009-01-01

    A photochemical reactor for studies of atmospheric kinetics and spectroscopy has been built at the Copenhagen Center for Atmospheric Research. The reactor consists of a vacuum FTIR spectrometer coupled to a 100 L quartz cylinder by multipass optics mounted on electropolished stainless steel end...

  4. A novel photocatalytic monolith reactor for multiphase heterogeneous photocatalysis

    NARCIS (Netherlands)

    Du, P.; Carneiro, J.T.; Moulijn, J.A.; Mul, Guido

    2008-01-01

    A novel reactor for multi-phase photocatalysis is presented, the so-called internally illuminated monolith reactor (IIMR). In the concept of the IIMR, side light emitting fibers are placed inside the channels of a ceramic monolith, equipped with a TiO2 photocatalyst coated on the wall of each

  5. Conceptos, culturas y comparaciones: PISA y el doble descontento alemán

    Directory of Open Access Journals (Sweden)

    Daniel Tröhler

    2013-01-01

    Full Text Available Este estudio analiza la aparición en Alemania de una animada e incluso agria discusión desde los ámbitos públicos y académicos sobre PISA, que se explica como un choque entre dos comprensiones culturales. El estudio aclara la relación entre tres conceptos fundamentales que se encuentran en el centro del debate en Alemania: competencia, Bildung y el conocimiento. Según el análisis del autor, el intento de algunos expertos alemanes de PISA de unificar los conceptos de competencia y Bildung ha causado un malestar importante y cierto escepticismo en Alemania. En el fondo de este conflicto radica, según el autor, un “choque cultural” entre el pragmatismo americano, por un lado, y el concepto alemán de Bildung por el otro. Bildung se resiste a ser racionalizado, es útil a varios niveles y, por último, no puede ser medido. El conflicto entre la competencia y Bildung se agrava, debido a que el enfoque de PISA no va dirigido a lo que los alumnos aprenden en la escuela sobre la base de sus planes (nacionales de estudio y libros de texto. La disputa alemana sobre PISA se interpreta como un descontento doble. Por un lado, PISA está poniendo en tela de juicio el concepto tradicional alemán de Bildung, centrándose en el mundo exterior (“Para afrontar los desafíos de la vida real”, en lugar de centrarse en el desarrollo del mundo interior (Persönlichkeit. Por otro lado, los resultados de la prueba también irrita a los propios expertos de PISA que tuvieron que advertir lo poco desarrollado de su proyecto educativo de un armónico y “único mundo” libre, con ciudadanos interactuando a nivel mundial y económicamente seguros. Esto es particularmente cierto en Alemania, donde la pobre coherencia y unidad nacional se hacía evidente, vistas las grandes diferencias en los resultados de PISA entre alumnos inmigrantes y nativos.

  6. 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...

  7. Nuclear fuel in a reactor accident.

    Science.gov (United States)

    Burns, Peter C; Ewing, Rodney C; Navrotsky, Alexandra

    2012-03-09

    Nuclear accidents that lead to melting of a reactor core create heterogeneous materials containing hundreds of radionuclides, many with short half-lives. The long-lived fission products and transuranium elements within damaged fuel remain a concern for millennia. Currently, accurate fundamental models for the prediction of release rates of radionuclides from fuel, especially in contact with water, after an accident remain limited. Relatively little is known about fuel corrosion and radionuclide release under the extreme chemical, radiation, and thermal conditions during and subsequent to a nuclear accident. We review the current understanding of nuclear fuel interactions with the environment, including studies over the relatively narrow range of geochemical, hydrological, and radiation environments relevant to geological repository performance, and discuss priorities for research needed to develop future predictive models.

  8. Ozone absorption in a mechanically stirred reactor

    Directory of Open Access Journals (Sweden)

    LJILJANA TAKIC

    2007-08-01

    Full Text Available Ozone absorption in water was investigated in a mechanically stirred reactor, using both the semi-batch and continuous mode of operation. A model for the precise determination of the volumetric mass transfer coefficient in open tanks without the necessity of the measurement the ozone concentration in the outlet gas was developed. It was found that slow ozone reactions in the liquid phase, including the decomposition of ozone, can be regarded as one pseudo-first order reaction. Under the examined operating conditions, the liquid phase was completely mixed, while mixing in a gas phase can be described as plug flow. The volumetric mass transfer coefficient was found to vary with the square of the impeller speed.

  9. A Pebble Bed Reactor cross section methodology

    Energy Technology Data Exchange (ETDEWEB)

    Hudson, Nathanael H. [Nuclear and Radiological Engineering/Medical Physics Programs, George W. Woodruff School, Georgia Institute of Technology, Atlanta, GA 30332-0405 (United States); Ougouag, Abderrafi M. [Idaho National Laboratory, Idaho Falls, ID 83415-3885 (United States); Rahnema, Farzad [Nuclear and Radiological Engineering/Medical Physics Programs, George W. Woodruff School, Georgia Institute of Technology, Atlanta, GA 30332-0405 (United States)], E-mail: farzad@gatech.edu; Gougar, Hans [Idaho National Laboratory, Idaho Falls, ID 83415-3885 (United States)

    2009-08-15

    A method is presented for the evaluation of microscopic cross sections for the Pebble Bed Reactor (PBR) neutron diffusion computational models during convergence to an equilibrium (asymptotic) fuel cycle. This method considers the isotopics within a core spectral zone and the leakages from such a zone as they arise during reactor operation. The randomness of the spatial distribution of fuel grains within the fuel pebbles and that of the fuel and moderator pebbles within the core, the double heterogeneity of the fuel, and the indeterminate burnup of the spectral zones all pose a unique challenge for the computation of the local microscopic cross sections. As prior knowledge of the equilibrium composition and leakage is not available, it is necessary to repeatedly re-compute the group constants with updated zone information. A method is presented to account for local spectral zone composition and leakage effects without resorting to frequent spectrum code calls. Fine group data are pre-computed for a range of isotopic states. Microscopic cross sections and zone nuclide number densities are used to construct fine group macroscopic cross sections, which, together with fission spectra, flux modulation factors, and zone buckling, are used in the solution of the slowing down balance to generate a new or updated spectrum. The microscopic cross-sections are then re-collapsed with the new spectrum for the local spectral zone. This technique is named the Spectral History Correction (SHC) method. It is found that this method accurately recalculates local broad group microscopic cross sections. Significant improvement in the core eigenvalue, flux, and power peaking factor is observed when the local cross sections are corrected for the effects of the spectral zone composition and leakage in two-dimensional PBR test problems.

  10. CONTINUOUS PRODUCTION OF HYDROXYPROPYL STARCH IN A STATIC MIXER REACTOR

    NARCIS (Netherlands)

    LAMMERS, G; STAMHUIS, EJ; BEENACKERS, AACM

    A novel type of reactor for the chemical derivatization of starch pastes is presented. The design is based on the application of static mixers. The reactor shows excellent plug flow behaviour with a Peclet number of about 100. The viscosity behaviour of concentrated starch pastes in the static mixer

  11. Fast Pyrolysis of Lignin Using a Pyrolysis Centrifuge Reactor

    DEFF Research Database (Denmark)

    Trinh, Ngoc Trung; Jensen, Peter Arendt; Sárossy, Zsuzsa

    2013-01-01

    Fast pyrolysis of lignin from an ethanol plant was investigated on a lab scale pyrolysis centrifuge reactor (PCR) with respect to pyrolysis temperature, reactor gas residence time, and feed rate. A maximal organic oil yield of 34 wt % dry basis (db) (bio-oil yield of 43 wt % db) is obtained...

  12. A review on patents for hydrogen production using membrane reactors

    NARCIS (Netherlands)

    Gallucci, F.; Basile, Angelo; Iulianelli, Adolfo; Kuipers, J.A.M.

    2009-01-01

    Membrane reactors are a modern configuration which integrates reaction and separation units in one vessel and results in a tremendous degree of process intensification. Application of membrane reactors for hydrogen production has been widely studied in literature because membranes with infinite

  13. La administración de justicia penal en la alcaldía mayor de San Luis Minas de Potosí, 1592-1786

    OpenAIRE

    López Ledesma, Adriana

    2016-01-01

    La administación de justicia en la Nueva España entre los siglos XVI a XVIII, así como, su contexto de documentación de archivo es una materia muy poco atendida científicamete por parte de los Historiadores del Derecho, razón que justifica la elaboración del presente trabajo de grado denominado: “La administración de justicia penal en la Alcaldía Mayor de San Luis Minas del Potosí, 1598-1786”. La descripción y el análisis de la práctica judicial y criminal de esta jurisdicción potosina conduc...

  14. A Design of Alarm System in a Research Reactor Facility

    Energy Technology Data Exchange (ETDEWEB)

    Park, Jaekwan; Jang, Gwisook; Seo, Sangmun; Suh, Yongsuk [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2013-05-15

    The digital alarm system has become an indispensable design to process a large amount of alarms of power plants. Korean research reactor operated for decades maintains a hybrid alarm system with both an analog annunciator and a digital alarm display. In this design, several alarms are indicated on an analog panel and digital display, respectively, and it requires more attention and effort of the operators. As proven in power plants, a centralized alarm system design is necessary for a new research reactor. However, the number of alarms and operators in a research reactor is significantly lesser than power plants. Thus, simplification should be considered as an important factor for the operation efficiency. This paper introduces a simplified alarm system. As advances in information technology, fully digitalized alarm systems have been applied to power plants. In a new research reactor, it will be more useful than an analog or hybrid configuration installed in research reactors decades ago. However, the simplification feature should be considered as an important factor because the number of alarms and number of operators in a research reactor is significantly lesser than in power plants.

  15. 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 cuenta la clasificación de la OMS. PMID:29142775

  16. Introduction to Chemical Engineering Reactor Analysis: A Web-Based Reactor Design Game

    Science.gov (United States)

    Orbey, Nese; Clay, Molly; Russell, T.W. Fraser

    2014-01-01

    An approach to explain chemical engineering through a Web-based interactive game design was developed and used with college freshman and junior/senior high school students. The goal of this approach was to demonstrate how to model a lab-scale experiment, and use the results to design and operate a chemical reactor. The game incorporates both…

  17. Reactor Physics

    Energy Technology Data Exchange (ETDEWEB)

    Ait Abderrahim, A

    2001-04-01

    The Reactor Physics and MYRRHA Department of SCK-CEN offers expertise in various areas of reactor physics, in particular in neutronics calculations, reactor dosimetry, reactor operation, reactor safety and control and non-destructive analysis of reactor fuel. This expertise is applied in the Department's own research projects in the VENUS critical facility, in the BR1 reactor and in the MYRRHA project (this project aims at designing a prototype Accelerator Driven System). Available expertise is also used in programmes external to the Department such as the reactor pressure steel vessel programme, the BR2 reactor dosimetry, and the preparation and interpretation of irradiation experiments by means of neutron and gamma calculations. The activities of the Fuzzy Logic and Intelligent Technologies in Nuclear Science programme cover several domains outside the department. Progress and achievements in these topical areas in 2000 are summarised.

  18. Nuclear waste disposal utilizing a gaseous core reactor

    Science.gov (United States)

    Paternoster, R. R.

    1975-01-01

    The feasibility of a gaseous core nuclear reactor designed to produce power to also reduce the national inventories of long-lived reactor waste products through nuclear transmutation was examined. Neutron-induced transmutation of radioactive wastes is shown to be an effective means of shortening the apparent half life.

  19. A simplified method for limit conversion calculation in membrane reactors

    NARCIS (Netherlands)

    Gallucci, F.; De Falco, Marcello; Basile, Angelo

    2010-01-01

    Membrane reactors (MRs) are often used to carry out equilibrium limited reactions. This is because the thermodynamic equilibrium is a strong constrain for traditional systems. Even with very active catalysts, traditional reactors (TRs) cannot give conversions higher than those allowed by the

  20. Protective actions as a factor in power reactor siting

    Energy Technology Data Exchange (ETDEWEB)

    Gant, K.S.; Schweitzer, M.

    1984-06-01

    This report examines the relationship between a power reactor site and the ease of implementing protective actions (emergency measures a serious accident). Limiting populating density around a reactor lowers the number of people at risk but cannot assure that all protective actions are possible for those who reside near the reactor. While some protective measures can always be taken (i.e., expedient respiratory protection, sheltering) the ability to evacuate the area or find adequate shelter may depend on the characteristics of the area near the reactor site. Generic siting restrictions designed to identify and eliminate these site-specific constraints would be difficult to formulate. The authors suggest identifying possible impediments to protective actions at a proposed reactor site and addressing these problems in the emergency plans. 66 references, 6 figures, 8 tables.

  1. The use of open-ended questions to verify the mathematical literacy. Suggestions from PISA 2012

    Directory of Open Access Journals (Sweden)

    Giorgio Asquini

    2016-04-01

    Full Text Available The paper presents the results of the Italian students in OECD-PISA 2012. The results for the open-ended questions related to mathematical literacy are examined. The OECD database compendium for the cognitive item responses has been used, the items were grouped into the categories of PISA mathematical framework (content, context, process, and the classification by performance level has also been considered. The overall weakness of the Italian students in the open-ended questions is explained by the high rate of missing and very poor performance in some categories (“change and relationships”, “scientific context”, “formulate”. Italian students perform better in a few categories (“social context”, “interpreting and evaluating”, “space and shape”, but these new findings may represent a starting point for improvement. The possible use of data on open-ended questions in teacher training is also discussed. L’uso delle domande aperte per la verifica della competenza matematica. Suggestioni da PISA 2012Il saggio presenta i risultati degli studenti italiani nell’indagine OECD-PISA 2012. Vengono considerati i risultati per le domande a risposta aperta relative alla literacy matematica. È stato utilizzato il database relativo al compendio degli item cognitivi, raggruppando gli item secondo le categorie matematiche del quadro di riferimento del PISA (contenuto, contesto, processo, a cui si è aggiunta la classificazione per livello di performance. La complessiva debolezza degli studenti italiani nelle domande aperte è determinata in particolare dall’alto tasso di omissioni e dai risultati molto scarsi in alcune categorie (“cambiamento e relazioni”, “ambito scientifico”, “formulazione matematica”. Gli studenti italiani ottengono risultati migliori in poche categorie (“contesto sociale”, “interpretazione e valutazione”, “spazio e forma”, che possono rappresentare un punto di partenza per il

  2. Adapting Dynamic Mathematical Models to a Pilot Anaerobic Digestion Reactor

    Directory of Open Access Journals (Sweden)

    F. Haugen, R. Bakke, and B. Lie

    2013-04-01

    Full Text Available A dynamic model has been adapted to a pilot anaerobic reactor fed diarymanure. Both steady-state data from online sensors and laboratory analysis anddynamic operational data from online sensors are used in the model adaptation.The model is based on material balances, and comprises four state variables,namely biodegradable volatile solids, volatile fatty acids, acid generatingmicrobes (acidogens, and methane generating microbes (methanogens. The modelcan predict the methane gas flow produced in the reactor. The model may beused for optimal reactor design and operation, state-estimation and control.Also, a dynamic model for the reactor temperature based on energy balance ofthe liquid in the reactor is adapted. This model may be used for optimizationand control when energy and economy are taken into account.

  3. San Sebastian, the challenges of a coastal city

    Energy Technology Data Exchange (ETDEWEB)

    Iglesias, V. [City Council of Donostia-San Sebastian (Spain)

    2008-07-01

    In 1998, the City Council of San Sebastian signed the Aalborg Charter and entered the process of the Local Agenda 21. For the development of the process, some monographical seminars were established with the participation of technical workers from different administrations and of citizen's representatives. Apart from that, an Environmental Advisory Council was created. In August 2004, the first Local Action Plan was approved for the 2004--2007 period. Since the Plan was launched, external monitoring reviews have been carried out yearly on the implementation degree of the actions. The global result of those evaluations has been satisfactory. In 2007, the government of San Sebastian determined to prepare an Action Plan on Climate Change (APCC). By developing that tool, the City joined the commitment of taking measures to favor the Kyoto Protocol, the main legal instrument which defines the actions to be taken against climate change. To elaborate that Plan, an instrument to measure greenhouse gas emissions has been used, designed by the net of Basque Municipalities for sustainability. Apart from the inventory, the Local Agenda 21, the Strategic Plan of the Municipality and the General Urban Development Plan have also been taken into account. By means of the APCC, the City aims to work in three fields, at different time and space scales, with an integrated policy of Mitigation, Compensation and Adaptation, that is to say, developing a long-term strategy based on social learning, on the contribution of technological innovation to reduce greenhouse gas (GHG) emissions and on the lessening of the effects provoked by climate change on local and global well-being. The document of the APCC has undergone a wide process of public account and particiation. After the participation process, the APCC for San Sebastian has finally been passed. The strategic lines of the plan are the following: (1) Integrated planning for sustainable mobility; (2) Towards an energy pattern: An

  4. Anaerobic Digestion of Sugarcane Vinasse Through a Methanogenic UASB Reactor Followed by a Packed Bed Reactor.

    Science.gov (United States)

    Cabrera-Díaz, A; Pereda-Reyes, I; Oliva-Merencio, D; Lebrero, R; Zaiat, M

    2017-12-01

    The anaerobic treatment of raw vinasse in a combined system consisting in two methanogenic reactors, up-flow anaerobic sludge blanket (UASB) + anaerobic packed bed reactors (APBR), was evaluated. The organic loading rate (OLR) was varied, and the best condition for the combined system was 12.5 kg COD m -3 day -1 with averages of 0.289 m 3 CH 4  kg COD r -1 for the UASB reactor and 4.4 kg COD m -3 day -1 with 0.207 m 3 CH 4  kg COD r -1 for APBR. The OLR played a major role in the emission of H 2 S conducting to relatively stable quality of biogas emitted from the APBR, with H 2 S concentrations vinasse through the combined system with COD removal efficiency of 86.7% and higher CH 4 and a lower H 2 S content in biogas.

  5. Ground water recharge to the aquifers of northern San Luis Valley, Colorado: A remote sensing investigation

    Science.gov (United States)

    Lee, K. (Principal Investigator); Huntley, D.

    1976-01-01

    The author has identified the following significant results. Ground water recharge to the aquifers of San Luis Valley west of San Luis Creek was primarily from ground water flow in the volcanic aquifers of the San Juan Mountains. The high permeability and anisotropic nature of the volcanic rocks resulted in very little contrast in flow conditions between the San Juan Mountains and San Luis Valley. Ground water recharge to aquifers of eastern San Luis Valley was primarily from stream seepage into the upper reaches of the alluvial fans at the base of the Sangre de Cristo Mountains. The use of photography and thermal infrared imagery resulted in a savings of time and increase in accuracy in regional hydrogeologic studies. Volcanic rocks exhibited the same spectral reflectance curve as sedimentary rocks, with only the absolute magnitude of reflectance varying. Both saline soils and vegetation were used to estimate general ground water depths.

  6. In Memoriam: Prof. Dr. José Miguel Alfredo María Cei (1918-2007)

    OpenAIRE

    Scolaro, José Alejandro; Videla, Fernando

    2007-01-01

    Nació en San Miniato (Pisa, Italia) en 1918. Realizó el Bachillerato clásico en Florencia y sus estudios universitarios en la Facultad de Ciencias Naturales, rama Biología y la Facultad de Medicina de Florencia y Pisa. En 1940 obtuvo su Doctorado en Ciencias Biológicas (esp. Zoología). Diploma que posteriormente fue revalidado en la Universidad Nacional de Tucumán, en 1952 cuando obtuvo la ciudadanía Argentina. Desde 1942 a 1947 trabajó como Ayudante de Cátedra, Profesor Asistente y Profesor ...

  7. 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.

  8. Defluoridation of drinking water by electrocoagulation/electroflotation in a stirred tank reactor with a comparative performance to an external-loop airlift reactor

    OpenAIRE

    Essadki, Abdel Hafid; Gourich, Bouchaib; Vial, Christophe; Delmas, Henri; Bennajah, Mounir

    2009-01-01

    Defluoridation using batch electrocoagulation/electroflotation (EC/EF) was carried out in two reactors for comparison purpose: a stirred tank reactor (STR) close to a conventional EC cell and an external-loop airlift reactor (ELAR) that was recently described as an innovative reactor for EC. The respective influences of current density, initial concentration and initial pH on the efficiency of defluoridation were investigated. The same trends were observed in both reactors, but the efficiency...

  9. Hygro-Thermo-Mechanical Analysis of a Reactor Vessel

    Directory of Open Access Journals (Sweden)

    Jaroslav Kruis

    2012-01-01

    Full Text Available Determining the durability of a reactor vessel requires a hygro-thermo-mechanical analysis of the vessel throughout its service life. Damage, prestress losses, distribution of heat and moisture and some other quantities are needed for a durability assessment. A coupled analysis was performed on a two-level model because of the huge demands on computer hardware. This paper deals with a hygro-thermo-mechanical analysis of a reactor vessel made of prestressed concrete with a steel inner liner. The reactor vessel is located in Temelín, Czech Republic.

  10. Performance of U.S. 15-Year-Old Students in Mathematics, Science, and Reading Literacy in an International Context. First Look at PISA 2012. NCES 2014-024

    Science.gov (United States)

    Kelly, Dana; Nord, Christine Winquist; Jenkins, Frank; Chan, Jessica Ying; Kastberg, David

    2013-01-01

    The Program for International Student Assessment (PISA) is a system of international assessments that allows countries to compare outcomes of learning as students near the end of compulsory schooling. PISA core assessments measure the performance of 15-year-old students in mathematics, science, and reading literacy every 3 years. Coordinated by…

  11. A Wide Range Neutron Detector for Space Nuclear Reactor Applications

    Science.gov (United States)

    Nassif, Eduardo; Matatagui, Emilio; Sismonda, Miguel; Pretorius, Stephan

    2007-01-01

    We propose here a versatile and innovative solution for monitoring and controlling a space-based nuclear reactor that is based on technology already proved in ground based reactors. A Wide Range Neutron Detector (WRND) allows for a reduction in the complexity of space based nuclear instrumentation and control systems. A ground model, predecessor of the proposed system, has been installed and is operating at the OPAL (Open Pool Advanced Light Water Research Reactor) in Australia, providing long term functional data. A space compatible Engineering Qualification Model of the WRND has been developed, manufactured and verified satisfactorily by analysis, and is currently under environmental testing.

  12. Research Reactors

    Energy Technology Data Exchange (ETDEWEB)

    Martens, Frederick H. [Argonne National Laboratory; Jacobson, Norman H.

    1968-09-01

    This booklet discusses research reactors - reactors designed to provide a source of neutrons and/or gamma radiation for research, or to aid in the investigation of the effects of radiation on any type of material.

  13. CATALYTIC RECOMBINER FOR A NUCLEAR REACTOR

    Science.gov (United States)

    King, L.D.P.

    1960-07-01

    A hydrogen-oxygen recombiner is described for use with water-boiler type reactors. The catalyst used is the wellknown platinized alumina, and the novelty lies in the structural arrangement used to prevent flashback through the gas input system. The recombiner is cylindrical, the gases at the input end being deflected by a baffle plate through a first flashback shield of steel shot into an annular passage adjacent to and extending the full length of the housing. Below the baffle plate the gases flow first through an outer annular array of alumina pellets which serve as a second flashback shield, a means of distributing the flowing gases evenly and as a means of reducing radiation losses to the walls. Thereafter the gases flow inio the centrally disposed catalyst bed where recombination is effected. The steam and uncombined gases flow into a centrally disposed cylindrical passage inside the catalyst bod and thereafter out through the exit port. A high rate of recombination is effected.

  14. Grado de satisfacción de los usuarios domésticos de la ex Hacienda Chuquitanta por el Servicio Público de Electricidad

    OpenAIRE

    Tejada Cabanillas, Adán Almírcar

    2014-01-01

    El objetivo principal de| presente trabajo de investigación es determinar el grado de satisfacción de los usuarios domésticos de la Ex Hacienda Chuquitanta del distrito de San Martín de Porres por el servicio de electricidad en lo que se refiere al suministro de energía, comunicación e información, facturación y recaudo, atención al cliente y la imagen que recibe de parte de la Empresa distribuidora de energía eléctrica EDELNOR. The main objective of the present investigatio...

  15. CATEGORIZACIÓN DE LAS IDEAS PREVIAS DE LOS ESTUDIANTES DE GRADO SÉPTIMO SOBRE EL CONCEPTO DE RESPIRACIÓN ANIMAL

    OpenAIRE

    Bayron Gil Bohórquez

    2015-01-01

    La escuela es un escenario de transición desde las ideas previas de los estudiantes hacia formas de comprensión más cercanas a las del conocimiento científico, por ello las ideas previas constituyen el punto de partida más importante en el diseño y la implementación de toda Unidad Didáctica basada en el enfoque de aprendizaje significativo. Se analizaron las ideas previas de 40 estudiantes del grado séptimo (11-15 años) de la Institución Educativa Departamental San Gabriel, ubicado en el muni...

  16. Emergency heat removal system for a nuclear reactor

    Science.gov (United States)

    Dunckel, Thomas L.

    1976-01-01

    A heat removal system for nuclear reactors serving as a supplement to an Emergency Core Cooling System (ECCS) during a Loss of Coolant Accident (LOCA) comprises a plurality of heat pipes having one end in heat transfer relationship with either the reactor pressure vessel, the core support grid structure or other in-core components and the opposite end located in heat transfer relationship with a heat exchanger having heat transfer fluid therein. The heat exchanger is located external to the pressure vessel whereby excessive core heat is transferred from the above reactor components and dissipated within the heat exchanger fluid.

  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. A new VFA sensor technique for anaerobic reactor systems

    DEFF Research Database (Denmark)

    Pind, Peter Frode; Angelidaki, Irini; Ahring, Birgitte Kiær

    2003-01-01

    to monitor VFA online in one of the most difficult media: animal slurry or manure. A novel in situ filtration technique has made it possible to perform microfiltration inside a reactor system. This filter enables sampling from closed reactor systems without large-scale pumping and filters. Furthermore, due...... to its small size it can be placed in lab-scale reactors without disturbing the process. Using this filtration technique together with commercially available membrane filters we have constructed a VFA sensor system that can perform automatic analysis of animal slurry at a frequency as high as every 15...... filtration technique are being presented is this article....

  19. Neutron dosimetry. Environmental monitoring in a BWR type reactor; Dosimetria de neutrones. Monitoreo ambiental en un reactor del tipo BWR

    Energy Technology Data Exchange (ETDEWEB)

    Tavera D, L.; Camacho L, M.E

    1991-01-15

    The measurements carried out on reactor dosimetry are applied mainly to the study on the effects of the radiation in 108 materials of the reactor; little is on the environmental dosimetry outside of the primary container of BWR reactors. In this work the application of a neutron spectrometer formed by plastic detectors of nuclear traces manufactured in the ININ, for the environmental monitoring in penetrations around the primary container of the unit I of the Laguna Verde central is presented. The neutron monitoring carries out with purposes of radiological protection, during the operational tests of the reactor. (Author)

  20. 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.

  1. 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

  2. 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.

  3. INTERVAL OBSERVER FOR A BIOLOGICAL REACTOR MODEL

    Directory of Open Access Journals (Sweden)

    T. A. Kharkovskaia

    2014-05-01

    Full Text Available The method of an interval observer design for nonlinear systems with parametric uncertainties is considered. The interval observer synthesis problem for systems with varying parameters consists in the following. If there is the uncertainty restraint for the state values of the system, limiting the initial conditions of the system and the set of admissible values for the vector of unknown parameters and inputs, the interval existence condition for the estimations of the system state variables, containing the actual state at a given time, needs to be held valid over the whole considered time segment as well. Conditions of the interval observers design for the considered class of systems are shown. They are: limitation of the input and state, the existence of a majorizing function defining the uncertainty vector for the system, Lipschitz continuity or finiteness of this function, the existence of an observer gain with the suitable Lyapunov matrix. The main condition for design of such a device is cooperativity of the interval estimation error dynamics. An individual observer gain matrix selection problem is considered. In order to ensure the property of cooperativity for interval estimation error dynamics, a static transformation of coordinates is proposed. The proposed algorithm is demonstrated by computer modeling of the biological reactor. Possible applications of these interval estimation systems are the spheres of robust control, where the presence of various types of uncertainties in the system dynamics is assumed, biotechnology and environmental systems and processes, mechatronics and robotics, etc.

  4. Comparison of simulated and measured quantities of a duplex reactor

    Energy Technology Data Exchange (ETDEWEB)

    Koskela, M.; Kajava, M. [ABB Marine, Helsinki (Finland)

    1997-12-31

    The purpose of this article is to illustrate the use of an analog simulator as a design tool when designing new power electric equipment. The purpose of simulation is to predict the functionality of electrical equipment to be constructed. Duplex reactor is an electromagnetic device designed to reduce voltage harmonics and short circuit currents in the ship electrical network. In this report a comparison between simulated and measured electrical quantities of a duplex reactor has been made. The purpose of the measurements was to show the correct functioning of the reactor. The simulation results and the measured waveforms corresponds well to each other. (orig.) 4 refs.

  5. A Potential NASA Research Reactor to Support NTR Development

    Science.gov (United States)

    Eades, Michael; Gerrish, Harold; Hardin, Leroy

    2013-01-01

    In support of efforts for research into the design and development of a man rated Nuclear Thermal Rocket (NTR) engine, the National Aeronautics and Space Administration (NASA), Marshall Space Flight Center (MSFC), is evaluating the potential for building a Nuclear Regulatory Commission (NRC) licensed research reactor. The proposed reactor would be licensed by NASA and operated jointly by NASA and university partners. The purpose of this reactor would be to perform further research into the technologies and systems needed for a successful NTR project and promote nuclear training and education.

  6. Passive modular gas safety system for a reactor

    Energy Technology Data Exchange (ETDEWEB)

    Abalin, S.S.; Isaev, I.F.; Kulakov, A.A.; Sivokon, V.P.; Udovenko, A.N.; Ionaitis, R.R.

    1994-01-01

    Reactor safety systems have developed gradually. Today in particular, auxiliary systems are being developed which are based on nontraditional operational concepts, by using gaseous neutron absorbers. The Scientific-Research and Design Institute of Power Technology (NIKIET) and the Institute of Nuclear Reactors, Kurchatov Institute Reactor Science Center (RNTs), have done preliminary development and experimental verification of separate elements of this system, in which helium is used as the absorber. This article presents a rapid passive safety system based on gaseous absorber, which is made as autonomous modules as the final stage of reactor safety. Its effectiveness is discussed by using an RBMK reactor as an example. As opposed to traditional active, systems, it does not require a functioning power supply and information signals from outside the reactors system, which makes it stable against unsanctioned actions by personnel, the influence of other systems, and also outside actions (sabotage and natural calamities which could destroy the the nuclear power plant structure). Because the gas safety system can operate instantaneously (0.1-0.3 sec), in principle, it can shut down the reactor even with fast-neutron runaway, where traditional safety systems are ineffective.

  7. Las Competencias transversales en el grado de farmacia.

    OpenAIRE

    Amat, Concepció; Escubedo Rafa, Elena; March Pujol, Marian; Simon Pallisé, Joan; Zulaica Gallego, Ester

    2012-01-01

    En el Grado de Farmacia de la Universitat de Barcelona estamos llevando a cabo acciones para que la formación de los estudiantes incluya la adquisición de competencias transversales. Hemos elaborado un mapa de competencias, que asigna cada una de las ocho competencias del Grado de Farmacia a grupos de asignaturas, de forma que se garantice su consecución progresiva a lo largo del currículum académico. Se han organizado jornadas de reflexión y cursos de formación para el profesorado implicado,...

  8. Development of a research nuclear reactor simulator using LABVIEW®

    Energy Technology Data Exchange (ETDEWEB)

    Lage, Aldo Marcio Fonseca; Mesquita, Amir Zacarias; Pinto, Antonio Juscelino; Souza, Luiz Claudio Andrade [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2015-07-01

    The International Atomic Energy Agency recommends the use of safety and friendly interfaces for monitoring and controlling the operational parameters of the nuclear reactors. The most important variable in the nuclear reactors control is the power released by fission of the fuel in the core which is directly proportional to neutron flux. It was developed a digital system to simulate the neutron evolution flux and monitoring their interaction on the other operational parameters. The control objective is to bring the reactor power from its source level (mW) to a few W. It is intended for education of basic reactor neutronic principles such as the multiplication factor, criticality, reactivity, period, delayed neutron and control by rods. The 250 kW IPR-R1 TRIGA research reactor at Nuclear Technology Development Center - CDTN (Belo Horizonte/Brazil) was used as reference. TRIGA reactors, developed by General Atomics (GA), are the most widely used research reactor in the world. They are cooled by light water under natural convection and are characterized by being inherently safety. The simulation system was developed using the LabVIEW® (Laboratory Virtual Instruments Engineering Workbench) software, considering the modern concept of virtual instruments (VI's). The main purpose of the system is to provide to analyze the behavior, and the tendency of some processes that occur in the reactor using a user-friendly operator interface. The TRIGA simulator system will allow the study of parameters, which affect the reactor operation, without the necessity of using the facility.(author)

  9. A probabilistic consequence assessment for a very high temperature reactor

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Joeun; Kim, Jintae; Jae, Moosung [Hanyang Univ., Seoul (Korea, Republic of). Dept. of Nuclear Engineering

    2017-02-15

    Currently, fossil fuel is globally running out. If current trends continue, crude oil will be depleted in 20 years and natural gas in 40 years. In addition, the use of fossil resource has increased emissions of green gas such as carbon dioxide. Therefore, there has been a strong demand in recent years for producing large amounts of hydrogen as an alternative energy [1]. To generate hydrogen energy, very high temperature more than 900 C is required but this level is not easy to reach. Because a Very High Temperature Reactor (VHTR), one of next generation reactor, is able to make the temperature, it is regarded as a solution of the problem. Also, VHTR has an excellent safety in comparison with existing and other next generation reactors. Especially, a passive system, Reactor Cavity Cooling System (RCCS), is adopted to get rid of radiant heat in case of accidents. To achieve variety requirements of new designed-reactors, however, it needs to develop new methodologies and definitions different with existing method. At the same time, an application of probability safety assessment (PSA) has been proposed to ensure the safety of next generation NPPs. For this, risk-informed designs of structures have to be developed and verified. Particularly, the passive system requires to be evaluated for its reliability. The objective of this study is to improve safety of VIITR by conducting risk profile.

  10. 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.

  11. Process for treating effluent from a supercritical water oxidation reactor

    Science.gov (United States)

    Barnes, Charles M.; Shapiro, Carolyn

    1997-01-01

    A method for treating a gaseous effluent from a supercritical water oxidation reactor containing entrained solids is provided comprising the steps of expanding the gas/solids effluent from a first to a second lower pressure at a temperature at which no liquid condenses; separating the solids from the gas effluent; neutralizing the effluent to remove any acid gases; condensing the effluent; and retaining the purified effluent to the supercritical water oxidation reactor.

  12. The uncertainty analysis of a liquid metal reactor for burning minor actinides from light water reactors

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Hang Bok [Korea Atomic Energy Research Institute, Taejon (Korea, Republic of)

    1998-12-31

    The neutronics analysis of a liquid metal reactor for burning minor actinides has shown that uncertainties in the nuclear data of several key minor actinide isotopes can introduce large uncertainties in the predicted performance of the core. A comprehensive sensitivity and uncertainty analysis was performed on a 1200 MWth actinide burner designed for a low burnup reactivity swing, negative doppler coefficient, and low sodium void worth. Sensitivities were generated using depletion perturbation methods for the equilibrium cycle of the reactor and covariance data was taken ENDF-B/V and other published sources. The relative uncertainties in the burnup swing, doppler coefficient, and void worth were conservatively estimated to be 180%, 97%, and 46%, respectively. 5 refs., 1 fig., 3 tabs. (Author)

  13. The Jules Horowitz reactor (JHR), a European material testing reactor (MTR), with extended experimental capabilities

    Energy Technology Data Exchange (ETDEWEB)

    Ballagny, A.; Bergamaschi, Y.; Bouilloux, Y.; Bravo, X.; Guigon, B.; Rommens, M.; Tremodeux, P. [CEA Cadarache, Dir. de l' Energie Nucleaire DEN, 13 - Saint-Paul-lez-Durance (France)]|[CEA Saclay Dir. de l' Energie Nucleaire DEN, 91 - Gif sur Yvette (France)

    2003-07-01

    The Jules Horowitz Reactor (JHR) is the European MTR (Material Testing Reactor) designed to provide, after 2010, the necessary knowledge for keeping the existing power plants in operation and to design innovative reactors types with new objectives such as: minimizing the radioactive waste production, taking into account additional safety requirements, preventing risks of nuclear proliferation... To achieve such an ambitious objective. The JHR is designed with a high flexibility in order to satisfy the current demand from European industry, research and to be able to accommodate future requirements. The JHR will offer a wide range of performances and services in gathering, in a single site at Cadarache, all the necessary functionalities and facilities for an effective production of results: e.g. fuel fabrication laboratories, preparation of the instrumented devices, interpretation of the experiments, modelling. The JHR must rely on a top level scientific environment based on experts teams from CEA and EC and local universities. With a thermal flux of 7,4.10{sup 14} ncm{sup -2} s{sup -1} and a fast flux of 6,4.10{sup 14} ncm{sup -2}s{sup -1}, it is possible to carry out irradiation experiments on materials and fuels whatever the reactor type considered. It will also be possible to carry out locally, fast neutron irradiation to achieve damage effect up to 25 dpa/year. (dpa = displacement per atom.) The study of the fuels behavior under accidental conditions, from analytical experiments, on a limited amount of irradiated fuel, is a major objective of the project. These oriented safety tests are possible by taking into account specific requirements in the design of the facility such as the tightness level of the containment building, the addition of an alpha hot cell and a laboratory for on line fission products measurement. (authors)

  14. WILDCAT: a catalyzed D-D tokamak reactor

    Energy Technology Data Exchange (ETDEWEB)

    Evans, K. Jr.; Baker, C.C.; Brooks, J.N.

    1981-11-01

    WILDCAT is a conceptual design of a catalyzed D-D, tokamak, commercial, fusion reactor. WILDCAT utilizes the beneficial features of no tritium breeding, while not extrapolating unnecessarily from existing D-T designs. The reactor is larger and has higher magnetic fields and plasma pressures than typical D-T devices. It is more costly, but eliminates problems associated with tritium breeding and has tritium inventories and throughputs approximately two orders of magnitude less than typical D-T reactors. There are both a steady-state version with Alfven-wave current drive and a pulsed version. Extensive comparison with D-T devices has been made, and cost and safety analyses have been included. All of the major reactor systems have been worked out to a level of detail appropriate to a complete, conceptual design.

  15. The Unimpressible Race. A Century of Educational Struggle by the Chinese in San Francisco.

    Science.gov (United States)

    Low, Victor

    This book traces the history of the Chinese experience in America, particularly in the San Francisco area, from the California Gold Rush era of the 1850s to the construction of a new all-Chinese school in San Francisco's Chinatown district in the 1950s. The first five chapters of the book detail the withholding of school privileges from both…

  16. Chimextla Project. A Summary Report on Educational Needs of Latinos: County of San Mateo.

    Science.gov (United States)

    de la Rocha-Petris, Gilberto

    A survey was conducted by the San Mateo County Community College District in Fall 1979 to determine the demographic characteristics of the Latino population in San Mateo County (i.e., age, sex, place of residence, income, ethnic orientation, language of greater fluency, employment status, and occupation); Latino attitudes toward their educational…

  17. Comparison of slurry versus fixed-bed reactor costs for indirect liquefaction applications. A supplement to final report: Design of slurry reactor for indirect liquefaction applications

    Energy Technology Data Exchange (ETDEWEB)

    Prakash, A.; Bendale, P.G.

    1991-12-01

    This work is a comparative evaluation of slurry reactors and fixed-bed reactors, with special emphasis on cost. Relative differences between slurry reactors and fixed-bed reactors have been pointed out in previous reviews; the differences pertinent to indirect liquefaction are summarized here. Design of both types is outlined.

  18. Technology Options for a Fast Spectrum Test Reactor

    Energy Technology Data Exchange (ETDEWEB)

    D. M. Wachs; R. W. King; I. Y. Glagolenko; Y. Shatilla

    2006-06-01

    Idaho National Laboratory in collaboration with Argonne National Laboratory has evaluated technology options for a new fast spectrum reactor to meet the fast-spectrum irradiation requirements for the USDOE Generation IV (Gen IV) and Advanced Fuel Cycle Initiative (AFCI) programs. The US currently has no capability for irradiation testing of large volumes of fuels or materials in a fast-spectrum reactor required to support the development of Gen IV fast reactor systems or to demonstrate actinide burning, a key element of the AFCI program. The technologies evaluated and the process used to select options for a fast irradiation test reactor (FITR) for further evaluation to support these programmatic objectives are outlined in this paper.

  19. I fondi dell’Accademia di San Luca a Roma.

    Directory of Open Access Journals (Sweden)

    Raffaella Inglese

    2008-06-01

    Full Text Available La famosa Accademia di San Luca si trova a Roma, nella piazza omonima, nei pressi della Fontana di Trevi, che dà il nome all’intero Rione, dal 1934 nello storico palazzo del cardinal Carpegna, attribuito ad un seguace di Giacomo della Porta e trasformato da Borromini. In occasione delle mostre sono aperte al pubblico alcune sale al piano terreno, mentre convegni, conferenze o presentazioni di libri sono ospitati nella sala conferenze situata al piano nobile. Gli studiosi hanno accesso agli ambienti del secondo piano destinati ad Archivio Storico, Biblioteca Sarti e Biblioteca Accademica. La Galleria, che ospita una selezione delle collezioni di pittura e scultura dell´Accademia, è situata al terzo piano del palazzo.

  20. 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.

  1. Modelo predictivo de discapacidad en adultos con lesión medular de San Juan de Pasto (Colombia): resultados desde WHO-DAS II

    OpenAIRE

    Imbachi Menéses, Leila Rosmery; Roldán González, Elizabeth; Silva Ruíz, Adriana Isabel; Henao Lema, Claudia Patricia; Pérez Parra, Julio Ernesto

    2013-01-01

    Objetivo: Establecer un modelo predictivo del grado de discapacidad en adultos con lesión medular de San Juan de Pasto (Colombia) a partir de la utilización del WHO-DAS II. Métodos: Se correlacionó el grado de discapacidad (por áreas y global) con variables sociodemográficas, clínicas y relacionadas con los servicios de rehabilitación y se construyó un modelo de regresión lineal múltiple para discapacidad global. Participaron 42 personas con lesión medular de variada etiología, nivel neuro...

  2. 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

  3. Modeling a Packed Bed Reactor Utilizing the Sabatier Process

    Science.gov (United States)

    Shah, Malay G.; Meier, Anne J.; Hintze, Paul E.

    2017-01-01

    A numerical model is being developed using Python which characterizes the conversion and temperature profiles of a packed bed reactor (PBR) that utilizes the Sabatier process; the reaction produces methane and water from carbon dioxide and hydrogen. While the specific kinetics of the Sabatier reaction on the RuAl2O3 catalyst pellets are unknown, an empirical reaction rate equation1 is used for the overall reaction. As this reaction is highly exothermic, proper thermal control is of the utmost importance to ensure maximum conversion and to avoid reactor runaway. It is therefore necessary to determine what wall temperature profile will ensure safe and efficient operation of the reactor. This wall temperature will be maintained by active thermal controls on the outer surface of the reactor. Two cylindrical PBRs are currently being tested experimentally and will be used for validation of the Python model. They are similar in design except one of them is larger and incorporates a preheat loop by feeding the reactant gas through a pipe along the center of the catalyst bed. The further complexity of adding a preheat pipe to the model to mimic the larger reactor is yet to be implemented and validated; preliminary validation is done using the smaller PBR with no reactant preheating. When mapping experimental values of the wall temperature from the smaller PBR into the Python model, a good approximation of the total conversion and temperature profile has been achieved. A separate CFD model incorporates more complex three-dimensional effects by including the solid catalyst pellets within the domain. The goal is to improve the Python model to the point where the results of other reactor geometry can be reasonably predicted relatively quickly when compared to the much more computationally expensive CFD approach. Once a reactor size is narrowed down using the Python approach, CFD will be used to generate a more thorough prediction of the reactors performance.

  4. Installation of a new type of nuclear reactor in Mexico: advantages and disadvantages; Instalacion de un nuevo tipo de reactor nuclear en Mexico: ventajas y desventajas

    Energy Technology Data Exchange (ETDEWEB)

    Jurado P, M.; Martin del Campo M, C. [FI-UNAM, 04510 Mexico D.F. (Mexico)]. e-mail: mjp_green@hotmail.com

    2005-07-01

    In this work the main advantages and disadvantages of the installation of a new type of nuclear reactor different to the BWR type reactor in Mexico are presented. A revision of the advanced reactors is made that are at the moment in operation and of the advanced reactors that are in construction or one has already planned its construction in the short term. Specifically the A BWR and EPR reactors are analyzed. (Author)

  5. 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....

  6. A study on naphtha catalytic reforming reactor simulation and analysis

    OpenAIRE

    Liang, Ke-min; Guo, Hai-Yan; Pan, Shi-Wei

    2005-01-01

    A naphtha catalytic reforming unit with four reactors in series is analyzed. A physical model is proposed to describe the catalytic reforming radial flow reactor. Kinetics and thermodynamics equations are selected to describe the naphtha catalytic reforming reactions characteristics based on idealizing the complex naphtha mixture by representing the paraffin, naphthene, and aromatic groups by single compounds. The simulation results based above models agree very well with actual operation uni...

  7. A study on naphtha catalytic reforming reactor simulation and analysis.

    Science.gov (United States)

    Liang, Ke-min; Guo, Hai-yan; Pan, Shi-wei

    2005-06-01

    A naphtha catalytic reforming unit with four reactors in series is analyzed. A physical model is proposed to describe the catalytic reforming radial flow reactor. Kinetics and thermodynamics equations are selected to describe the naphtha catalytic reforming reactions characteristics based on idealizing the complex naphtha mixture by representing the paraffin, naphthene, and aromatic groups by single compounds. The simulation results based above models agree very well with actual operation unit data.

  8. Heat barrier for use in a nuclear reactor facility

    Science.gov (United States)

    Keegan, Charles P.

    1988-01-01

    A thermal barrier for use in a nuclear reactor facility is disclosed herein. Generally, the thermal barrier comprises a flexible, heat-resistant web mounted over the annular space between the reactor vessel and the guard vessel in order to prevent convection currents generated in the nitrogen atmosphere in this space from entering the relatively cooler atmosphere of the reactor cavity which surrounds these vessels. Preferably, the flexible web includes a blanket of heat-insulating material formed from fibers of a refractory material, such as alumina and silica, sandwiched between a heat-resistant, metallic cloth made from stainless steel wire. In use, the web is mounted between the upper edges of the guard vessel and the flange of a sealing ring which surrounds the reactor vessel with a sufficient enough slack to avoid being pulled taut as a result of thermal differential expansion between the two vessels. The flexible web replaces the rigid and relatively complicated structures employed in the prior art for insulating the reactor cavity from the convection currents generated between the reactor vessel and the guard vessel.

  9. CONTROL OF VOLATILE ORGANIC COMPOUNDS BY AN AC ENERGIZED FERROELECTRIC PELLET REACTOR AND A PULSED CORONA REACTOR

    Science.gov (United States)

    The paper gives results of a study to develop baseline engineering data to demonstrate the feasibility of application of plasma reactors to the destruction of various volatile organic compounds at ppm levels. Two laboratory-scale reactors, an alternating current energized ferroel...

  10. A novel reverse flow reactor coupling endothermic and exothermic reactions. Part I: comparison of reactor configurations for irreversible endothermic reactions

    NARCIS (Netherlands)

    van Sint Annaland, M.; Scholts, H.A.R.; Kuipers, J.A.M.; van Swaaij, Willibrordus Petrus Maria

    2002-01-01

    A new reactor concept is studied for highly endothermic heterogeneously catalysed gas phase reactions at high temperatures with rapid but reversible catalyst deactivation. The reactor concept aims to achieve an indirect coupling of energy necessary for endothermic reactions and energy released by

  11. 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.

  12. From biofilm ecology to reactors: a focused review

    DEFF Research Database (Denmark)

    Boltz, Joshua P.; Smets, Barth F.; Rittmann, Bruce E.

    2017-01-01

    has led to significant advances in the understanding of biofilm ecology. New metabolic pathways, such as anaerobic ammonium oxidation (anammox) or complete ammonium oxidation (comammox) were first observed in biofilm reactors. The functions, properties, and constituents of the biofilm extracellular...... the following three topics: (1) biofilm ecology, (2) biofilm reactor technology and design, and (3) biofilm modeling. In so doing, it addresses the processes occurring in the biofilm, and how these affect and are affected by the broader biofilm system. The symphonic application of a suite of biological methods...... been used for water treatment, with current focus on moving bed biofilm reactors, integrated fixed-film activated sludge, membrane-supported biofilm reactors, and granular sludge processes. The control and/or beneficial use of biofilms in membrane processes is advancing. Biofilm models have become...

  13. Denitrification characteristics of a sulfur autotrophic denitrification reactor

    Directory of Open Access Journals (Sweden)

    Chenxiao ZHANG

    2016-02-01

    Full Text Available The denitrification characteristics of a sulfur autotrophic denitrification reactor are investigated. The results show that domestication of sulfur autotrophic bacteria is completed within 15 days after biofilm formation in the reactor, which is shorter than other similar researches. The nitrogen removal rate remains over than 90%, and the denitrification rate reaches 18.5 mg N/(L·h with influent NO-3-N of 70 mg/L , influent pH of 8 and HRT of 4.3 h . Thiobacillus denitrificans are observed in the whole reactor when domestication finishes, while it is more abundant in the middle and lower part. The optimal influent NO-3-N concentration for the reactor is 50 mg/L, the optimal temperature is 30~35 ℃, the optimal influent pH is 7~8, and the nitrogen removal rate is over than 90%.

  14. Development of a Linear Flow Channel Reactor for sulphur removal ...

    African Journals Online (AJOL)

    2013-09-23

    Sep 23, 2013 ... in acid mine wastewater treatment operations. JB Molwantwa1 and PD ... bed reactor treating a synthetic acid mine water (2 000 mg∙ℓ−1 Na2SO4 solution) and the Liner Flow Channel Reactors (sur- face area 1.1 m2 and 2.2 ... structures were reported for tannery wastewater evaporation ponds (Rose et al., ...

  15. Backscatter A [8101]--Offshore of San Francisco, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the acoustic-backscatter map of the Offshore of San Francisco map area, California. Backscatter data are provided as separate...

  16. A Web Application to Facilitate Syphilis Reactor Grid Evaluations.

    Science.gov (United States)

    Avoundjian, Tigran; Khosropour, Christine M; Golden, Matthew R; Barbee, Lindley A; Dombrowski, Julia C

    2017-08-28

    Many health departments use a "reactor grid" to determine which laboratory-reported syphilis serologic test results require investigation. We developed a Web-based tool, the Syphilis Reactor Grid Evaluator (SRGE), to facilitate health department reactor grid evaluations and test the tool using data from Seattle & King County, Washington. We developed SRGE using the R Shiny Web application framework. When populated with a data set including titer results and final disposition codes, SRGE displays the percent of verified early syphilis cases by serologic titer result and patient age in each cell of the grid. The results can be optionally stratified by sex, test type, and previous rapid plasma reagin titer. The impact of closing laboratory results without investigation in cells selected by the user is dynamically computed. The SRGE calculates the percent of all laboratory reports closed ("efficiency gained"), the proportion of all early syphilis cases closed without investigation ("case finding loss"), and the ratio of percent of cases identified for investigation to percent of all laboratory reports investigated ("efficiency ratio"). After defining algorithms, users can compare them side-by-side, combine subgroup-specific algorithms, and export results. We used SRGE to compare the current Public Health-Seattle & King County (PHSKC) reactor grid to 5 alternate algorithms. Of 13,504 rapid plasma reagin results reported to PHSKC from January 1, 2006, to December 31, 2015, 1565 were linked to verified early syphilis cases. Updating PHSKC's current reactor grid could result in an efficiency gain of 4.8% to 25.2% (653-3403 laboratory reports) and case finding loss of 1% to 8.4% (10-99 fewer cases investigated). The Syphilis Reactor Grid Evaluator can be used to rapidly evaluate alternative approaches to optimizing the reactor grid. Changing the reactor grid in King County to close more laboratory results without investigation could improve efficiency with minimal impact on

  17. CONVECTION REACTOR

    Science.gov (United States)

    Hammond, R.P.; King, L.D.P.

    1960-03-22

    An homogeneous nuclear power reactor utilizing convection circulation of the liquid fuel is proposed. The reactor has an internal heat exchanger looated in the same pressure vessel as the critical assembly, thereby eliminating necessity for handling the hot liquid fuel outside the reactor pressure vessel during normal operation. The liquid fuel used in this reactor eliminates the necessity for extensive radiolytic gas rocombination apparatus, and the reactor is resiliently pressurized and, without any movable mechanical apparatus, automatically regulates itself to the condition of criticality during moderate variations in temperature snd pressure and shuts itself down as the pressure exceeds a predetermined safe operating value.

  18. Astrocitoma de grado I en glándula pineal

    OpenAIRE

    Iglesias Rozas, José Rafael, 1942-

    1985-01-01

    Tres imágenes de un astrocitoma de grado I situado en la glándula pineal de un paciente de 10 años. Three pictures of a grade I astrocytoma located in the pineal gland of a 10-year-old male patient.

  19. Designing a mini subcritical nuclear reactor; Diseno de un mini reactor nuclear subcritico

    Energy Technology Data Exchange (ETDEWEB)

    Escobedo G, C. R.; Vega C, H. R.; Davila H, V. M., E-mail: rafelaescobedo@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Jardin Juarez 147, Col. Centro, 98000 Zacatecas, Zac. (Mexico)

    2015-10-15

    In this work the design of a mini subcritical nuclear reactor formed by means of light water moderator, uranium as fuel, and isotopic neutron source of {sup 239}PuBe was carried out. The design was done by Monte Carlo methods with the code MCNP5 in which uranium was modeled in an array of concentric holes cylinders of 8.5, 14.5, 20.5, 26.5, 32.5 cm of internal radius and 3 cm of thickness, 36 cm of height. Different models were made from a single fuel cylinder (natural uranium) to five. The neutron source of {sup 239}PuBe was situated in the center of the mini reactor; in each arrangement was used water as moderator. Cross sections libraries Endf/Vi were used and the number of stories was large enough to ensure less uncertainty than 3%. For each case the effective multiplication factor k{sub e}-f{sub f}, the amplification factor and the power was calculated. Outside the mini reactor the ambient dose equivalent H (10) was calculated for different cases. The value of k{sub eff}, the amplification factor and power are directly related to the number of cylinders of uranium as fuel. Although the average energy of the neutrons {sup 239}PuBe is between 4.5 and 5 MeV in the case of the mini reactor for a cylinder, in the neutron spectrum the presence of thermal neutrons does not exist, so that produced fissions are generated with fast neutrons, and in designs of two and three rings the neutron spectra shows the presence of thermal neutrons, however the fissions are being generated with fast neutrons. Finally in the four and five cases the amount of moderator is enough to thermalized the neutrons and thereby produce the fission. The maximum value for k{sub eff} was 0.82; this value is very close to the assembly of Universidad Autonoma de Zacatecas generating a k{sub eff} of 0.86. According to the safety and radiation protection standards for the design of mini reactor of one, two and three cylinders they comply with the established safety, while designs of four and five

  20. Diseño de un módulo de IFMIF para irradiación de envolturas regeneradoras basadas en metales líquidos para reactores de fusión

    OpenAIRE

    Casal Iglesias, Natalia

    2016-01-01

    La fusión nuclear es, hoy en día, una alternativa energética a la que la comunidad internacional dedica mucho esfuerzo. El objetivo es el de generar entre diez y cincuenta veces más energía que la que consume mediante reacciones de fusión que se producirán en una mezcla de deuterio (D) y tritio (T) en forma de plasma a doscientos millones de grados centígrados. En los futuros reactores nucleares de fusión será necesario producir el tritio utilizado como combustible en el propio reactor termon...

  1. Performance of a Novel Decentralised Sewage Treatment Reactor

    Directory of Open Access Journals (Sweden)

    Dong Sheng Shen

    2013-01-01

    Full Text Available A novel decentralised sewage treatment reactor (DSTR for treating domestic sewage in rural areas was designed and investigated. The reactor was started aerobically after inoculation with biomass; the amount of initial mixed liquid suspended solids was 1.5 g/L. Oxygen was supplied to the reactor and the dissolved oxygen concentration was maintained at 1.3 ± 0.2 mg/L. The pollutant removal performance was investigated, and the average removal efficiencies of total chemical oxygen demand (TCOD, NH4+-N, suspended solids, and turbidity were 76%, 77.15%, 84.17%, and 83.93%, respectively. The DSTR exhibited good performance compared with the traditional activated sludge (AS reactor. The resistance to impact load of the DSTR was superior to that of the AS reactor during surface load experiments. During the 120 days of operation, no sludge bulking was observed. The DSTR effluent NH4+-N and TCOD levels were a little higher than those for the AS reactor, but the disparity was not major.

  2. A design study of reactor core optimization for direct nuclear heat-to-electricity conversion in a space power reactor

    Energy Technology Data Exchange (ETDEWEB)

    Yoshikawa, Hidekazu; Takahashi, Makoto; Shimoda, Hiroshi; Takeoka, Satoshi [Kyoto Univ. (Japan); Nakagawa, Masayuki; Kugo, Teruhiko

    1998-01-01

    To propose a new design concept of a nuclear reactor used in the space, research has been conducted on the conceptual design of a new nuclear reactor on the basis of the following three main concepts: (1) Thermionic generation by thermionic fuel elements (TFE), (2) reactivity control by rotary reflector, and (3) reactor cooling by liquid metal. The outcomes of the research are: (1) A calculation algorithm was derived for obtaining convergent conditions by repeating nuclear characteristic calculation and thermal flow characteristic calculation for the space nuclear reactor. (2) Use of this algorithm and the parametric study established that a space nuclear reactor using 97% enriched uranium nitride as the fuel and lithium as the coolant and having a core with a radius of about 25 cm, a height of about 50 cm and a generation efficiency of about 7% can probably be operated continuously for at least more than ten years at 100 kW only by reactivity control by rotary reflector. (3) A new CAD/CAE system was developed to assist design work to optimize the core characteristics of the space nuclear reactor comprehensively. It is composed of the integrated design support system VINDS using virtual reality and the distributed system WINDS to collaboratively support design work using Internet. (N.H.)

  3. Feline leukaemia virus (FeLV) and feline immunodeficiency virus infections in cats in the Pisa district of Tuscany, and attempts to control FeLV infection in a colony of domestic cats by vaccination.

    Science.gov (United States)

    Bandecchi, P; Dell'Omodarme, M; Magi, M; Palamidessi, A; Prati, M C

    2006-04-22

    The seroprevalence of feline immunodeficiency virus (FIV) in 203 apparently healthy domestic cats living in the district of Pisa, central Italy, was 11.3 per cent, and the prevalence of feline leukaemia virus (FeLV) was 8.4 per cent. The prevalence of FIV depended significantly on the lifestyle and age of the cats; cats living outdoors were more likely to be FIV-positive than cats living indoors, and the proportion of FIV-positive cats increased with age. In contrast, there was no significant relationship between these variables and the prevalence of FeLV. There was no significant relationship between the cats' seropositivity for FIV and FeLV. The results of a five-year field study to control FeLV infection by vaccination in a colony of 30 domestic adult cats naturally exposed to the infection suggest that the vaccination was effective in FIV-negative cats, but failed to protect FIV-positive cats against FeLV.

  4. Estrategia metodológica basada en la indagación guiada con estudiantes de grado séptimo de la Institución Educativa Rafael J. Mejía del municipio de Sabaneta

    OpenAIRE

    Ayala Arroyave, Catalina

    2013-01-01

    Resumen: este trabajo de grado se fundamenta en el diseño y aplicación de una estrategia metodológica de enseñanza, basada en la indagación guiada, aplicada especialmente en las salidas de campo; con el objetivo de estudiar los insectos utilizando como modelo las mariposas, con jóvenes de grado séptimo de la Institución Educativa Rafael J. Mejía del municipio de Sabaneta, Antioquia, dentro del entorno geográfico cercano a la institución. De la evaluación y análisis de los resultados obtenidos...

  5. Efectos de diferentes grados de sensibilidad a la insulina en la función endotelial de pacientes obesos

    OpenAIRE

    Galvão, Roberto [UNIFESP; Plavnik, Frida Liane [UNIFESP; Ribeiro, Fernando Flexa [UNIFESP; Ajzen, Sergio Aron [UNIFESP; Christofalo, Dejaldo M. de J. [UNIFESP; Kohlmann Junior, Osvaldo [UNIFESP

    2012-01-01

    FUNDAMENTO: A obesidade derivada da deposição de gordura intra-abdominal tende a aumentar a produção de hormônios e citoquinas, piorando a sensibilidade a insulina e levando a disfunção endotelial. A hiperinsulinemia é considerada um fator de risco independente para doença isquêmica cardíaca e é uma causa de disfunção endotelial em indivíduos saudáveis. OBJETIVO: Avaliar o impacto de diferentes graus de resistência a insulina, medida pelo HOMA-IR (Homeostasis Model Assessment of Insulin Resis...

  6. Actividades de orientación y tutoría en el grado de Informática

    OpenAIRE

    León, Coromoto

    2010-01-01

    La finalidad básica de la tutoría universitaria es la de ayudar al alumnado a la integración y adaptación al entorno universitario, el acceso a la información, la transición profesional, etc. El Modelo de Orientación y Tutoría que se propone para nuestra Universidad está estructurado en tres planos: la tutoría académica - realizada a nivel de asignatura por el profesorado de la misma. La tutoría de carrera - realizada a nivel de titulación de acuerdo con un plan específico dirigido a los e...

  7. PISA: Federated Search in P2P Networks with Uncooperative Peers

    Science.gov (United States)

    Ren, Zujie; Shou, Lidan; Chen, Gang; Chen, Chun; Bei, Yijun

    Recently, federated search in P2P networks has received much attention. Most of the previous work assumed a cooperative environment where each peer can actively participate in information publishing and distributed document indexing. However, little work has addressed the problem of incorporating uncooperative peers, which do not publish their own corpus statistics, into a network. This paper presents a P2P-based federated search framework called PISA which incorporates uncooperative peers as well as the normal ones. In order to address the indexing needs for uncooperative peers, we propose a novel heuristic query-based sampling approach which can obtain high-quality resource descriptions from uncooperative peers at relatively low communication cost. We also propose an effective method called RISE to merge the results returned by uncooperative peers. Our experimental results indicate that PISA can provide quality search results, while utilizing the uncooperative peers at a low cost.

  8. Tesis de grado publicadas en Estados Unidos sobre Colombia

    Directory of Open Access Journals (Sweden)

    Boletin Cultural y Bibliográfico Banco de la República

    1966-08-01

    Full Text Available Publicamos en el Boletín Cultural y Bibliográfico una lista completa de las tesis de grado que han sido escritas en los Estados Unidos y que tienen como tema a Colombia. Igualmente insertamos una introducción explicatoria, enviada por el Centro de Estudios Latino-Americanos, presidido por William Paul McGreevey

  9. Neutrino-4 experiment on the search for a sterile neutrino at the SM-3 reactor

    Science.gov (United States)

    Serebrov, A. P.; Ivochkin, V. G.; Samoylov, R. M.; Fomin, A. K.; Zinoviev, V. G.; Neustroev, P. V.; Golovtsov, V. L.; Gruzinsky, N. V.; Solovey, V. A.; Chernyi, A. V.; Zherebtsov, O. M.; Martemyanov, V. P.; Tsinoev, V. G.; Tarasenkov, V. G.; Aleshin, V. I.; Petelin, A. L.; Pavlov, S. V.; Izhutov, A. L.; Sazontov, S. A.; Ryazanov, D. K.; Gromov, M. O.; Afanasiev, V. V.; Matrosov, L. N.; Matrosov, M. Yu.

    2015-10-01

    In view of the possibility of the existence of a sterile neutrino, test measurements of the dependence of the reactor antineutrino flux on the distance from the reactor core has been performed on SM-2 reactor with the Neutrino-2 detector model in the range of 6-11 m. Prospects of the search for reactor antineutrinos at short distances have been discussed.

  10. Neutrino-4 experiment on the search for a sterile neutrino at the SM-3 reactor

    Energy Technology Data Exchange (ETDEWEB)

    Serebrov, A. P., E-mail: serebrov@pnpi.spb.ru; Ivochkin, V. G.; Samoylov, R. M.; Fomin, A. K.; Zinoviev, V. G.; Neustroev, P. V.; Golovtsov, V. L.; Gruzinsky, N. V.; Solovey, V. A.; Chernyi, A. V.; Zherebtsov, O. M. [National Research Centre “Kurchatov Institute,”, Konstantinov Petersburg Nuclear Physics Institute (Russian Federation); Martemyanov, V. P.; Tsinoev, V. G.; Tarasenkov, V. G.; Aleshin, V. I. [National Research Centre “Kurchatov Institute,” (Russian Federation); Petelin, A. L.; Pavlov, S. V.; Izhutov, A. L.; Sazontov, S. A.; Ryazanov, D. K. [State Scientific Centre Research Institute of Atomic Reactors (Russian Federation); and others

    2015-10-15

    In view of the possibility of the existence of a sterile neutrino, test measurements of the dependence of the reactor antineutrino flux on the distance from the reactor core has been performed on SM-2 reactor with the Neutrino-2 detector model in the range of 6–11 m. Prospects of the search for reactor antineutrinos at short distances have been discussed.

  11. Estrés percibido por el alumnado de nuevo ingreso al Grado en Enfermería

    OpenAIRE

    Pérez Contreras, Rosa María

    2015-01-01

    Introducción: El ingreso a la universidad es un proceso de transición y adaptación para el nuevo alumnado. Este periodo está lleno de cambios sociales, educativos y personales, donde los estudiantes tienen que enfrentarse a nuevas metodologías educativas y a altos niveles de exigencia. Todo ello hace que el alumnado de nuevo ingreso pueda sentir una falta de control sobre el nuevo ambiente y que adquiera hábitos que con el tiempo pueden ocasionar trastornos de salud. Objetivo: Conocer y co...

  12. Psicoanálisis y universidad: reflexiones en torno a su transmisión en carreras de grado

    OpenAIRE

    Tarodo, Paula Verónica

    2015-01-01

    El escrito se inscribe en un trabajo de investigación docente desplegado en el marco de la Especialidad en Docencia Universitaria (UNLP) y aborda algunos problemas de la trasmisión del psicoanálisis en la universidad. Se detiene en aquellos que se presentan en los primeros años de la formación académica, momento en que los estudiantes se acercan por primera vez a las nociones fundamentales del psicoanálisis. Toma como campo de análisis la coyuntura que se presenta en la asignatura Teoría Psic...

  13. El concepto de tiempo en niños y niñas de primer a sexto grado

    Directory of Open Access Journals (Sweden)

    Ana Teresa León

    2011-10-01

    Full Text Available This article reports the results of a doctoral thesis, related to the construction of the concept of timeby children from 1st to 6th grade of primary school, in the context of the social studies educational program applied inCosta Rica. The study was conducted using a mixed method research design, and in this case, it presents only the resultsof the quantitative component based on the application of a questionnaire to 148 children. Results included an increasingcomprehension of the different aspects of the concept of time as children advance in the educational system, nonetheless, the learning depends more on the personal experiences than on formal instruction, and, even at the 6th grade level, many childrenstill have not acquired the basic notions of the concept.

  14. Preliminary design of a Binary Breeder Reactor; Diseno preliminar de un reactor esferico de quema/cria

    Energy Technology Data Exchange (ETDEWEB)

    Garcia C, E. Y.; Francois, J. L.; Lopez S, R. C., E-mail: eliasgarcerv@hotmail.com [UNAM, Facultad de Ingenieria, Departamento de Sistemas Energeticos, Paseo Cuauhnahuac No. 8532, 62550 Jiutepec, Morelos (Mexico)

    2014-10-15

    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)

  15. 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.

  16. Enhanced model predictive control of a catalytic flow reversal reactor

    Energy Technology Data Exchange (ETDEWEB)

    Devals, C.; Bertrand, F.; Perrier, M. [Ecole Polytechnique, Montreal, PQ (Canada). Dept. de Genie Chimique; Fuxman, A.; Forbes, J.F.; Hayes, R.E. [Alberta Univ., Edmonton, AB (Canada). Dept. of Chemical and Materials Engineering

    2009-08-15

    The removal of atmospheric methane by conversion to carbon dioxide has the potential to significantly reduce the greenhouse gas (GHG) effect. Methane can be burned using conventional or catalytic combustion. Different types of reactors can be used for catalytic combustion, including the catalytic flow reversal reactor (CFRR) which has drawn much attention because auto-thermal operation can be achieved for lean low temperature feed. However, the control of CFRR is challenging. This study presented a method to predict the stationary state for the reactor. The method can be incorporated into a model predictive control (MPC) strategy as a terminal constant. The study involved a numerical simulation of the catalytic combustion of lean methane in a CFRR. In particular, the combustion of lean methane air mixtures in a CFRR was examined using a two dimensional heterogeneous continuum model, based on mole and energy balance equations for the solid (the inert and catalytic sections of the reactor) and the fluid phases. Several simulations were performed to study the reactor performance. The results showed the impact on the methane conversion and the maximum temperature in the reactor of key process parameters, such as the methane inlet concentration, the superficial gas velocity, the switching time, and the mass extraction rate. A simple empirical model was created to predict the maximum temperature and conversion of methane in the reactor at stationary state. Simulations revealed an improvement in control performance when adding a constraint for the maximum temperature. The improved results showed better performance in terms of heat extraction and smoothness of operation at low and high inlet concentrations. 23 refs., 4 tabs., 14 figs.

  17. 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.

  18. Tratamiento de las excretas de cerdo mediante un reactor anaeróbico SCFBR a nivel de banco Treatment of pig excreta using an SCFBR anaerobic reactor

    OpenAIRE

    Caicedo Luis A.; Duque Carlos O.; Molina T. Kevin G.

    1999-01-01

    sans-serif";; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: ES-CO; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="ES-CO">Un nuevo reactor anaeróbico denominado Sludge Central Fixed Bed Reactor (SCFBR) fue construido y evaluado para tratar los residuos líquidos de las granjas porcícolas. El SCFBR está constituido por tres zonas principales. Una zona infer...

  19. Assessment of benefits of research reactors in less developed countries. A case study of the Dalat reactor in Vietnam

    Energy Technology Data Exchange (ETDEWEB)

    Hien, P.D. [Vietnam Atomic Energy Agency, Hanoi (Viet Nam)

    1999-08-01

    The analysis of data on nuclear research reactor (NRR) and socio-economic conditions across countries reveals highly significant relationships of reactor power with GDP and R and D expenditure. The trends revealed can be used as preliminary guides for feasibility assessment of investment in a NRR. Concerning reactor performance, i.e. the number of reactor operation days per year, the covariation with R and D expenditure is most significant, but moderate, implying that there are other controlling factors, e.g. the engagement of country in nuclear power development. Thus, the size of the R and D fund is a most significant indicator to look at in reactor planning. Unfortunately, the lack of adequate R and D funding is a common and chronic problem in less developed countries. As NRR is among the biggest R and D investment in less developed countries, adequate cost benefit assessment is rightfully required. In the case of Vietnam, during 15 years of operation of a 500 kW NRR 2300 Ci of radioisotopes were delivered and 45,000 samples were analysed for multielemental compositions. From a pure financial viewpoint these figures would still be insignificant to justify the investment. However, the impact of the reactor on the technological development seems not to be a matter of pro and cons. The status of reactor utilization and lessons learned are presented and discussed. (author)

  20. Design of a Compact and Versatile Bench Scale Tubular Reactor

    Directory of Open Access Journals (Sweden)

    R. Prasad

    2009-06-01

    Full Text Available A compact and versatile laboratory tubular reactor has been designed and fabricated keeping in view of reducing capital cost and minimising energy consumption for gas/vapor-phase heterogeneous catalytic reactions. The reactor is consisted of two coaxial corning glass tubes with a helical coil of glass tube in between the coaxial tubes serving as vaporiser and pre-heater, the catalyst bed is in the inner tube. A schematic diagram of the reactor with detailed dimensions and working principles are described. The attractive feature of the reactor is that the vaporiser, pre-heater and fixed bed reactor are merged in a single compact unit. Thus, the unit minimises separate vaporiser and pre-heater, also avoids separate furnaces used for them and eliminate auxiliary instrumentation such as temperature controller etc. To demonstrate the system operation and illustrate the key features, catalyst screening data and the efficient collection of complete, and accurate intrinsic kinetic data are provided for oxidation of CO over copper chromite catalyst. CO oxidation is an important reaction for auto-exhaust pollution control. The suitability of the versatile nature of the reactor has been ascertained for catalytic reactions where either volatile or vaporizable feeds can be introduced to the reaction zone, e.g. oxidation of iso-octane, reduction of nitric oxide, dehydrogenation of methanol, ethanol and iso-propanol, hydrogenation of nitrobenzene to aniline, etc. Copyright (c 2009 by BCREC. All Rights reserved.[Received: 10 February 2009, Accepted: 9 May 2009][How to Cite: R. Prasad, G. Rattan. (2009. Design of a Compact and Versatile Bench Scale Tubular Reactor. Bulletin of Chemical Reaction Engineering and Catalysis, 4(1: 5-9.  doi:10.9767/bcrec.4.1.1250.5-9][How to Link/ DOI: http://dx.doi.org/10.9767/bcrec.4.1.1250.5-9

  1. Deterministic Safety Technology for RBMK Reactors

    Directory of Open Access Journals (Sweden)

    F. D'Auria

    2008-01-01

    The paper summarizes the activities performed at NIKIET in Moscow and at University of Pisa (UNIPI in Pisa. A top-down approach is pursued in structuring the executive summary that includes the following sections: (i the safety needed for the RBMK NPP, (ii the roadmap, (iii\tthe adopted computational tools, (iv\tkey findings, (v\tEmphasis is given to the multiple pressure tube rupture (MPTR issue and the individual channel monitoring (ICM proposal.

  2. Pisa syndrome in Parkinson's disease: diagnostic and management challenges

    OpenAIRE

    Miletić V

    2016-01-01

    Vladimir Miletić Department of Neurology, Movement Disorders Centre, University Hospital Centre Zagreb, Zagreb, Croatia Abstract: Pisa syndrome is a rare clinical entity characterized by marked lateral flexion of the trunk, which is typically mobile and resolves at supine position. When observed in clinical practice, it denotes an incapacitating symptom of underlying neurodegenerative disease such as Parkinson's disease, multiple system atrophy, and Alzheimer's disease. The ...

  3. 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.

  4. Proximal isovelocity surface area (PISA) in the evaluation of fixed membranous subaortic stenosis.

    Science.gov (United States)

    Goodkin, Gregory M; Tunick, Paul A; Kronzon, Itzhak

    2002-02-01

    The evaluation of the severity of subaortic stenosis is usually expressed by the magnitude of the subvalvular gradient. Calculation of the membrane orifice area noninvasively is difficult by the standard means. We present a patient in whom the area was calculated using the proximal isovelocity surface area (PISA) method. This method should have clinical applicability because it is not flow dependent and can be used in patients with normal, reduced, or increased stroke volume.

  5. 75 FR 38412 - Safety Zone; San Diego POPS Fireworks, San Diego, CA

    Science.gov (United States)

    2010-07-02

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; San Diego POPS Fireworks, San Diego, CA... zone on the ] navigable waters of San Diego Bay in support of the San Diego POPS Fireworks. This safety... San Diego POPS Fireworks, which will include fireworks presentations conducted from a barge in San...

  6. 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

  7. From biofilm ecology to reactors: a focused review.

    Science.gov (United States)

    Boltz, Joshua P; Smets, Barth F; Rittmann, Bruce E; van Loosdrecht, Mark C M; Morgenroth, Eberhard; Daigger, Glen T

    2017-04-01

    Biofilms are complex biostructures that appear on all surfaces that are regularly in contact with water. They are structurally complex, dynamic systems with attributes of primordial multicellular organisms and multifaceted ecosystems. The presence of biofilms may have a negative impact on the performance of various systems, but they can also be used beneficially for the treatment of water (defined herein as potable water, municipal and industrial wastewater, fresh/brackish/salt water bodies, groundwater) as well as in water stream-based biological resource recovery systems. This review addresses the following three topics: (1) biofilm ecology, (2) biofilm reactor technology and design, and (3) biofilm modeling. In so doing, it addresses the processes occurring in the biofilm, and how these affect and are affected by the broader biofilm system. The symphonic application of a suite of biological methods has led to significant advances in the understanding of biofilm ecology. New metabolic pathways, such as anaerobic ammonium oxidation (anammox) or complete ammonium oxidation (comammox) were first observed in biofilm reactors. The functions, properties, and constituents of the biofilm extracellular polymeric substance matrix are somewhat known, but their exact composition and role in the microbial conversion kinetics and biochemical transformations are still to be resolved. Biofilm grown microorganisms may contribute to increased metabolism of micro-pollutants. Several types of biofilm reactors have been used for water treatment, with current focus on moving bed biofilm reactors, integrated fixed-film activated sludge, membrane-supported biofilm reactors, and granular sludge processes. The control and/or beneficial use of biofilms in membrane processes is advancing. Biofilm models have become essential tools for fundamental biofilm research and biofilm reactor engineering and design. At the same time, the divergence between biofilm modeling and biofilm reactor

  8. Reactor Physics Behavior of Transuranic-Bearing TRISO-Particle Fuel in a Pressurized Water Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Michael A. Pope; R. Sonat Sen; Abderrafi M. Ougouag; Gilles Youinou; Brian Boer

    2012-04-01

    Calculations have been performed to assess the neutronic behavior of pins of Fully-Ceramic Micro-encapsulated (FCM) fuel in otherwise-conventional Pressurized Water Reactor (PWR) fuel pins. The FCM fuel contains transuranic (TRU)-only oxide fuel in tri-isotropic (TRISO) particles with the TRU loading coming from the spent fuel of a conventional LWR after 5 years of cooling. Use of the TRISO particle fuel would provide an additional barrier to fission product release in the event of cladding failure. Depletion calculations were performed to evaluate reactivity-limited burnup of the TRU-only FCM fuel. These calculations showed that due to relatively little space available for fuel, the achievable burnup with these pins alone is quite small. Various reactivity parameters were also evaluated at each burnup step including moderator temperature coefficient (MTC), Doppler, and soluble boron worth. These were compared to reference UO{sub 2} and MOX unit cells. The TRU-only FCM fuel exhibits degraded MTC and Doppler coefficients relative to UO{sub 2} and MOX. Also, the reactivity effects of coolant voiding suggest that the behavior of this fuel would be similar to a MOX fuel of very high plutonium fraction, which are known to have positive void reactivity. In general, loading of TRU-only FCM fuel into an assembly without significant quantities of uranium presents challenges to the reactor design. However, if such FCM fuel pins are included in a heterogeneous assembly alongside LEU fuel pins, the overall reactivity behavior would be dominated by the uranium pins while attractive TRU destruction performance levels in the TRU-only FCM fuel pins is. From this work, it is concluded that use of heterogeneous assemblies such as these appears feasible from a preliminary reactor physics standpoint.

  9. Canine leishmaniasis surveillance program in a San Marino Republic kennel.

    Science.gov (United States)

    Salvatore, Daniela; Di Francesco, Antonietta; Parigi, Maria; Poglayen, Giovanni; Battistini, Maurizio; Baldelli, Raffaella

    2013-01-01

    The Republic of San Marino is an autonomous State that, in view of its geographical and environmental features, can be considered a part of the Northern Italian territory, where the canine leishmaniasis (CanL) is endemic. In the past, a CanL focus in the Republic's kennel was described. As a consequence of this epidemiological situation, a surveillance program was carried-out covering a 6-year period (2006-2012). A total of 1,094 sera were collected from 420 kennel dogs and examined for antibodies to Leishmania infantum by the indirect fluorescent antibody test (IFAT). Eighty-eight (21%) dogs resulted IFAT positive (antibody titre ≥1/40). The overall seroprevalence increased in the first 4 years (2006-2010), going from 5.5% to 26.8% and then decreased in the 2 following years going to 17.9%(2011) and 3.9% (2012). The cumulative incidence constantly increased from 0.6% to 2.6%. This trend could be attributed to a changed infection pressure due to the dog turnover in the kennels. According to the observed incidence values, the CanL focus seems to be stable, supported by autochthonous transmission, new case introduction and Leishmania spp. circulation in owned dogs in the same area.

  10. Canine leishmaniasis surveillance program in a San Marino Republic kennel

    Directory of Open Access Journals (Sweden)

    Daniela Salvatore

    2013-12-01

    Full Text Available The Republic of San Marino is an autonomous State that, in view of its geographical and environmental features, can be considered a part of the Northern Italian territory, where the canine leishmaniasis (CanL is endemic. In the past, a CanL focus in the Republic's kennel was described. As a consequence of this epidemiological situation, a surveillance program was carried-out covering a 6-year period (2006-2012. A total of 1,094 sera were collected from 420 kennel dogs and examined for antibodies to Leishmania infantum by the indirect fluorescent antibody test (IFAT. Eighty-eight (21% dogs resulted IFAT positive (antibody titre ≥1/40. The overall seroprevalence increased in the first 4 years (2006-2010, going from 5.5% to 26.8% and then decreased in the 2 following years going to 17.9% (2011 and 3.9% (2012. The cumulative incidence constantly increased from 0.6% to 2.6%. This trend could be attributed to a changed infection pressure due to the dog turnover in the kennels. According to the observed incidence values, the CanL focus seems to be stable, supported by autochthonous transmission, new case introduction and Leishmania spp. circulation in owned dogs in the same area.

  11. Developing the Sixth Level of PISA-Like Mathematics Problems for Secondary School Students

    Directory of Open Access Journals (Sweden)

    Kamaliyah

    2013-01-01

    Full Text Available Indonesia's involvement in the Programme for International StudentAssessment (PISA is one attempt to see how far the development ofeducational programs in our country compared to other countries in theworld. PISA results show that Indonesia is still at the lower level. This means that the ability of Indonesian students in solving problems that require the ability to review, giving reasons and communicatingeffectively, and solve and interpret problems in various situations isstill lacking. This may be due to government policy in the presence ofthe National Examination (UN in which the spread of the UN’s questions are still at the lower levels of cognitive aspects that are not in line with government regulations on curriculum which suggests that the fulfillment of cognitive aspects as one of the important aspects of education. To that end, researcher conducted a study that aims to produce valid and practical the sixth level of PISA-like mathematics problems for middle school students. This study is the development research formative evaluation type. The research subjects are ninth grade students SMP Negeri 1 Palembang. Data collection techniques used are walk through, documentation, interviews, and tests. From the analysis it can be concluded that this research has resulted a product the sixth level of PISA-like mathematics problems. At the stage of expert review, an expert and two colleagues evaluated the problems from different aspects. Trying out at one-to-one and small group was performed on students with different mathematical abilities. Then at the field test stage, 26 students in one class answered the questions that were developed.

  12. Construyendo el Programa para la Evaluación Internacional de Estudiantes de la OCDE (PISA

    Directory of Open Access Journals (Sweden)

    Clara Morgan

    2013-01-01

    Full Text Available Este artículo propone un marco conceptual que se nutre de la economía política, las relaciones internacionales y las disciplinas de la sociología. El contexto económico-político sitúa PISA dentro de una racionalidad política más amplia del neoliberalismo. Las relaciones internacionales arrojan una luz sobre el papel que juega la influencia estadounidense en la construcción de PISA y, más generalmente, en el gobierno de las organizaciones internacionales. Las teorías derivadas de la sociología de la ciencia y la tecnología, y de la conceptualización de Michel Foucault de la formación de bloques de poder, proporcionan una comprensión de cómo “funciona” PISA y cómo se utiliza para ejercer el poder.

  13. Modelling of non-catalytic reactors in a gas-solid trickle flow reactor: Dry, regenerative flue gas desulphurization using a silica-supported copper oxide sorbent

    NARCIS (Netherlands)

    Kiel, J.H.A.; Kiel, J.H.A.; Prins, W.; van Swaaij, Willibrordus Petrus Maria

    1992-01-01

    A one-dimensional, two-phase dispersed plug flow model has been developed to describe the steady-state performance of a relatively new type of reactor, the gas-solid trickle flow reactor (GSTFR). In this reactor, an upward-flowing gas phase is contacted with as downward-flowing dilute solids phase

  14. 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

  15. Anaerobic sewage treatment in a one-stage UASB reactor and a combined UASB Digester system

    NARCIS (Netherlands)

    Mahmoud, N.A.; Zeeman, G.; Gijzen, H.J.; Lettinga, G.

    2004-01-01

    The treatment of sewage at 15°C was investigated in a one-stage upflow anaerobic sludge blanket (UASB) reactor and a UASB-Digester system. The latter consists of a UASB reactor complemented with a digester for mutual sewage treatment and sludge stabilisation. The UASB reactor was operated at a

  16. Development of capability to Model A TRIGA reactor using ATHENA

    Energy Technology Data Exchange (ETDEWEB)

    Davis, C.B.

    1985-05-01

    The capability to perform thermal-hydraulic analyses of a TRIGA reactor was demonstrated using the ATHENA computer code. TRIGA is an advanced reactor designed to produce electrical power while being inherently safe during reactivity accidents, loss-of-coolant accidents (LOCAs), and station blackout. The TRIGA system contains a water-filled primary system and a power conversion system that utilizes freon as the working fluid. An ATHENA model of a TRIGA-like reactor was developed. Calculations of a station blackout and a large-break LOCA were performed to demonstrate the capability of ATHENA to represent the TRIGA system. A mask of the TRIGA model and an interface with the Nuclear Plant Analyzer (NPA) were developed, allowing a graphic display of the calculated results on the NPA.

  17. The San Francisco MSM Epidemic: A Retrospective Analysis

    Directory of Open Access Journals (Sweden)

    Brandy L. Rapatski

    2015-11-01

    Full Text Available We investigate various scenarios for ending the San Francisco MSM (men having sex with men HIV/AIDS epidemic (1978–1984. We use our previously developed model and explore changes due to prevention strategies such as testing, treatment and reduction of the number of contacts. Here we consider a “what-if” scenario, by comparing different treatment strategies, to determine which factor has the greatest impact on reducing the HIV/AIDS epidemic. The factor determining the future of the epidemic is the reproduction number R0; if R0 < 1, the epidemic is stopped. We show that treatment significantly reduces the total number of infected people. We also investigate the effect a reduction in the number of contacts after seven years, when the HIV/AIDS threat became known, would have had in the population. Both reduction of contacts and treatment alone, however, would not have been enough to bring R0 below one; but when combined, we show that the effective R0 becomes less than one, and therefore the epidemic would have been eradicated.

  18. A FAST BREEDER REACTOR SPENT FUEL MEASUREMENTS PROGRAM FOR BN-350 REACTOR

    Energy Technology Data Exchange (ETDEWEB)

    P. STAPLES; J. HALBIG; ET AL

    1999-04-01

    A project to verify the fissile content of fast breeder reactor spent nuclear fuel is underway in the Republic of Kasakhstan. There are a variety of assembly types with different irradiation histories and profiles in the reactor that require a variety of measurement and analysis procedures. These procedures will be discussed and compared as will the general process that has been designed to resolve any potential measurement discrepancies. The underwater counter is part of a system that is designed to assist the International Atomic Energy Agency (IAEA) in maintaining continuity of knowledge from the time of measurement until the measured item is placed in a welded container with a unique identification. In addition to satisfying IAEA requirements for the spent nuclear fuel, this measurement program is able to satisfy some of the measurement requirements for the Kasakhstan Atomic Energy Agency concerning the repackaging of the spent nuclear fuel into a standard canister. The project is currently operational in a mode requiring the IAEA's continuous presence.

  19. Stimulus-Responsive Nanoparticles and Associated (Reversible) Polymorphism via Polymerization Induced Self-assembly (PISA).

    Science.gov (United States)

    Pei, Yiwen; Lowe, Andrew B; Roth, Peter J

    2017-01-01

    Polymerization-induced self-assembly (PISA) is an extremely versatile method for the in situ preparation of soft-matter nanoparticles of defined size and morphologies at high concentrations, suitable for large-scale production. Recently, certain PISA-prepared nanoparticles have been shown to exhibit reversible polymorphism ("shape-shifting"), typically between micellar, worm-like, and vesicular phases (order-order transitions), in response to external stimuli including temperature, pH, electrolytes, and chemical modification. This review summarises the literature to date and describes molecular requirements for the design of stimulus-responsive nano-objects. Reversible pH-responsive behavior is rationalised in terms of increased solvation of reversibly ionized groups. Temperature-triggered order-order transitions, conversely, do not rely on inherently thermo-responsive polymers, but are explained based on interfacial LCST or UCST behavior that affects the volume fractions of the core and stabilizer blocks. Irreversible morphology transitions, on the other hand, can result from chemical post-modification of reactive PISA-made particles. Emerging applications and future research directions of this "smart" nanoparticle behavior are reviewed. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  20. Removable check valve for use in a nuclear reactor

    Science.gov (United States)

    Dunn, Charlton; Gutzmann, Edward A.

    1988-01-01

    A removable check valve for interconnecting the discharge duct of a pump and an inlet coolant duct of a reactor core in a pool-type nuclear reactor. A manifold assembly is provided having an outer periphery affixed to and in fluid communication with the discharge duct of the pump and has an inner periphery having at least one opening therethrough. A housing containing a check valve is located within the inner periphery of the manifold. The upper end of the housing has an opening in alignment with the opening in the manifold assembly, and seals are provided above and below the openings. The lower end of the housing is adapted for fluid communication with the inlet duct of the reactor core.

  1. Avaliação e letramento: concepções de aluno letrado subjacentes ao SAEB e ao PISA Assessments and literacy: the notions of literate students that underpin SAEB and PISA

    Directory of Open Access Journals (Sweden)

    Alicia Bonamino

    2002-12-01

    Full Text Available Neste artigo, procuramos apresentar as concepções de letramento que servem de base para a construção das provas de duas avaliações em larga escala, a saber, o SAEB 1999 e o PISA 2000. Apresentamos também um panorama geral do SAEB e do PISA e das habilidades de leitura avaliadas em cada um deles. Realizamos uma comparação dessas habilidades buscando evidenciar a noção de letramento adotada pelo SAEB e pelo PISA e discutimos algumas das possíveis implicações da avaliação do letramento para a escola básica.This paper presents the different notions of literacy that underpin the SAEB 1999 and PISA 2000 assessments. It also brings forward an overview of these large scale assessment examinations that includes the reading skills that both test. Comparing such skills allowed us to seize the concept of literacy adopted in each. We finally discuSS some of the probable implications of literacy evaluation on elementary school.

  2. Collecting and recirculating condensate in a nuclear reactor containment

    Science.gov (United States)

    Schultz, T.L.

    1993-10-19

    An arrangement passively cools a nuclear reactor in the event of an emergency, condensing and recycling vaporized cooling water. The reactor is surrounded by a containment structure and has a storage tank for cooling liquid, such as water, vented to the containment structure by a port. The storage tank preferably is located inside the containment structure and is thermally coupleable to the reactor, e.g. by a heat exchanger, such that water in the storage tank is boiled off to carry away heat energy. The water is released as a vapor (steam) and condenses on the cooler interior surfaces of the containment structure. The condensed water flows downwardly due to gravity and is collected and routed back to the storage tank. One or more gutters are disposed along the interior wall of the containment structure for collecting the condensate from the wall. Piping is provided for communicating the condensate from the gutters to the storage tank. 3 figures.

  3. PISA method for assessment of mitral regurgitation in children.

    Science.gov (United States)

    Başpinar, Osman; Karaaslan, Sevim; Oran, Bülent

    2005-09-01

    The purpose of this study was to determine the feasibility and significance of the proximal isovelocity surface area (PISA) method in children with rheumatic mitral regurgitation (MR). Thirty-one children (mean age 12.3+/-3.1 years), with chronic MR, were evaluated by semiquantitative and quantitative Doppler, quantitative two-dimensional echocardiography and the PISA methods. Also, we compared the effective regurgitant orifice area, regurgitation volume and systolic left ventricular functions in mild-moderate and severe MR. There were no statistically significant differences in the regurgitant orifice area and regurgitant volume values obtained by the PISA method and the quantitative Doppler (p>0.05) but they were different from the same values obtained by two dimensional echocardiography (pPISA and left ventricular end-diastolic diameters, the ratio of the jet/left atrial area, grading with color Doppler imaging (r=0.763, r=0.745, r=0.618; pPISA method as like as the Doppler method.

  4. 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

  5. 75 FR 55975 - Safety Zone; San Diego Harbor Shark Fest Swim; San Diego Bay, San Diego, CA

    Science.gov (United States)

    2010-09-15

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; San Diego Harbor Shark Fest Swim; San Diego... Shark Fest Swim, consisting of 600 swimmers swimming a predetermined course. The sponsor will provide 26...; San Diego Harbor Shark Fest Swim; San Diego Bay, San Diego, CA. (a) Location. The following area is a...

  6. White Paper – Use of LEU for a Space Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Poston, David Irvin [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Mcclure, Patrick Ray [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-08-11

    Historically space reactors flown or designed for the U.S. and Russia used Highly Enriched Uranium (HEU) for fuel. HEU almost always produces a small and lighter reactor. Since mass increases launch costs or decreases science payloads, HEU was the natural choice. However in today’s environment, the proliferation of HEU has become a major concern for the U.S. government and hence a policy issue. In addition, launch costs are being reduced as the space community moves toward commercial launch vehicles. HEU also carries a heavy security cost to process, test, transport and launch. Together these issues have called for a re-investigation into space reactors the use Low Enriched Uranium (LEU) fuel.

  7. Adaptive LQ Cascade Control of a Tubular Chemical Reactor

    Directory of Open Access Journals (Sweden)

    Petr Dostal

    2016-01-01

    Full Text Available The paper deals with adaptive LQ cascade control design of a tubular chemical reactor with an exothermic consecutive reaction. The control is performed in primary and secondary control-loops where the primary controlled output of the reactor is the concentration of a main reaction product and the secondary output is the mean temperature of the reactant. A common control input is the coolant flow rate. The controller in the primary control-loop is a nonlinear P-controller with the gain calculated using simulated or measured steady-state characteristics of the reactor. The controller in the secondary control-loop is a LQ adaptive controller. The proposed method is verified by control simulations.

  8. Developing PISA-"Like" Mathematics Task with Indonesia Natural and Cultural Heritage as Context to Assess Students Mathematical Literacy

    Science.gov (United States)

    Oktiningrum, Wuli; Zulkardi; Hartono, Yusuf

    2016-01-01

    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…

  9. The Effect of Immigration on the School Performance of Natives: Cross Country Evidence Using PISA Test Scores

    Science.gov (United States)

    Brunello, Giorgio; Rocco, Lorenzo

    2013-01-01

    We use aggregate PISA data for 19 countries over the period 2000-2009 to study whether a higher share of immigrant pupils affects the school performance of natives. We find evidence of a negative and statistically significant relationship. The size of the estimated effect is small: doubling the share of immigrant pupils in secondary schools from…

  10. 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.

  11. 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.

  12. Thermal insulating barrier and neutron shield providing integrated protection for a nuclear reactor vessel

    Science.gov (United States)

    Schreiber, Roger B.; Fero, Arnold H.; Sejvar, James

    1997-01-01

    The reactor vessel of a nuclear reactor installation which is suspended from the cold leg nozzles in a reactor cavity is provided with a lower thermal insulating barrier spaced from the reactor vessel to form a chamber which can be flooded with cooling water through passive valving to directly cool the reactor vessel in the event of a severe accident. The passive valving also includes bistable vents at the upper end of the thermal insulating barrier for releasing steam. A removable, modular neutron shield extending around the upper end of the reactor cavity below the nozzles forms with the upwardly and outwardly tapered transition on the outer surface of the reactor vessel, a labyrinthine channel which reduces neutron streaming while providing a passage for the escape of steam during a severe accident, and for the cooling air which is circulated along the reactor cavity walls outside the thermal insulating barrier during normal operation of the reactor.

  13. 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.

  14. Evaluación de competencias en las prácticas tuteladas del Grado en Enfermería a través de la simulación clínica de alta fidelidad

    OpenAIRE

    Campo Cazallas, Cristino del

    2015-01-01

    Tesis inédita presentada en la Universidad Europea de Madrid. Facultad de Ciencias de la Salud. Programa de Doctorado en Ciencias de la Enfermería La evaluación de competencias se ha convertido en un aspecto muy relevante en los últimos años en el entorno académico. La necesidad de investigar y desarrollar nuevos instrumentos docentes y evaluativos es una realidad palpable en la comunidad universitaria. Como respuesta a esta necesidad en el Grado en Enfermería, nace este estudio que tiene...

  15. 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...

  16. Making Education Count for Development: Data Collection and Availability in Six PISA for Development Countries

    Science.gov (United States)

    OECD Publishing, 2016

    2016-01-01

    This report reviews the collection, availability and quality of system-level data and metadata on education from countries participating in the PISA for Development project: Cambodia, Ecuador, Guatemala, Paraguay, Senegal and Zambia. PISA for Development aims to increase low income countries' use of PISA assessments for monitoring progress towards…

  17. Terapias alternativas / complementares a visão do graduando de enfermagem Terapias alternativas / complementarias-la vision de alumno de pre-grado de enfermería Alternative practice of health - the view of nursing students

    Directory of Open Access Journals (Sweden)

    Monica Martins Trovó

    2002-03-01

    Full Text Available O objetivo desta pesquisa foi verificar se os graduandos de Enfermagem conhecem Terapias Alternativas/Complementares (TA, se esse conhecimento é adquirido, durante a graduação, e se utilizam ou recomendam seu uso.Os dados foram coletados de 96 alunos, dos 4 anos de graduação distribuídos eqüitativamente, de maneira que equivalessem a 30% dos alunos de cada ano. Verificou-se que 93,73% conhecem as T.A., que tal conhecimentonãoé adquirido durante a graduação,mas principalmente por meio do senso popular e que, embora a maioria (86,46% recomende seu uso, sobretudo por acreditar na sua eficácia, apenas cerca de um terço as utilizam.El objetivo de esta investigación fue verificar si los alumnos de pre-grado de enfermería, conocen las Terapias Alternativas - Complementarias (TA., si ese conocimiento es adquirido durante el pre-grado y si utilizan y recomiendan su uso. Los datos fueron recolectados con 96 alumnos de los cuatro años de pré-grado en enfermería, distribuidos equitativamente, de manera que equivalen al 30% de los alumnos de cada año. Se verifico que 93,73% conocen las T.A., que este conocimiento no es adquirido durante el pre-grado, sino principalmente por medio de censo popular, y aunque la mayoría (86,46% recomiende su uso, principalmente por creer en su eficacia, solo un tercio las utilizan.The objective of this research was verify if Nursing students know Alternative Practices of Health (A.PH., if-this knowledge is acquired during the graduation and if they use themselves or recommends this use. The bases were collected near to 96 students of the 4 years of graduation, that were shared out so that is the same as 30% of the students. We verified that 93,73% of the students know A.P.H., that this knowledge is not acquired during the graduation, but principally through the popular sense. Although the most of students (86,46% recommend the use of A.P.H., principally because they believe in its effectiveness, only about

  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. Módulo Activo Recreo Activo -MARA: una estrategia para incrementar la actividad física en niños y niñas de 5º grado en Bogotá.

    OpenAIRE

    Gámez Martínez, Elda Rocio

    2015-01-01

    Objetivo: Evaluar la efectividad de MARA (Modulo Activo Recreo Activo), sobre el tiempo de actividad física moderada vigorosa (AFMV) y de comportamiento sedentario de niños y niñas de 5º grado en 2 instituciones educativas oficiales de la ciudad de Bogotá. Materiales y métodos: Los participantes fueron 128 niños entre 10 y 12 años de edad, de 5to grado que asisten a dos colegios públicos en la localidad de San Cristóbal en Bogotá. La actividad física de los niños fue medida con aceler...

  20. "Accouchement sans douleur": le registre biomedical a l'epreuve ...

    African Journals Online (AJOL)

    évènement (social) qui la valorise. L'accouchement sans douleur semble donc se partager entre un idéal visé et une dérive. Mots clés: Bénin, Accouchement, douleur. English Title: The "painless childbirth": the biomedical register has the event ...

  1. REFLECTOR CONTROL OF A BOILING-WATER REACTOR

    Science.gov (United States)

    Treshow, M.

    1962-05-22

    A line connecting the reactor with a spent steam condenser contains a valve set to open when the pressure in the reactor exceeds a predetermined value and an orifice on the upstream side of the valve. Another line connects the reflector with this line between the orifice and the valve. An excess steam pressure causes the valve to open and the flow of steam through the line draws water out of the reflector. Provision is also made for adding water to the reflector when the steam pressure drops. (AEC)

  2. Maltodextrin hydrolysis in a fluidized-bed immobilized enzyme reactor

    Energy Technology Data Exchange (ETDEWEB)

    Vallat, I.; Monsan, P.; Riba, J.P.

    1986-02-01

    The present work deals with maltodextrin hydrolysis by glucoamylase immobilized onto corn stover in a fluidized bed reactor. An industrial enzyme preparation was convalently grafted onto corn stover, yielding an activity of up to 372 U/g and 1700 U/g for support particle sizes of 0.8 and 0.2 mm, respectively. A detailed kinetic study, using a differntial reactor, allowed the characterization of the influence of mass transfer resistance on the reaction catalyzed by immobilized glucoamylase. A simple and general mathematical model was then developed to describe the experimental conversion data and found to be vaild.

  3. How Does ICT Use Influence Students' Achievements in Math and Science over Time? Evidence from PISA 2000 to 2012

    Science.gov (United States)

    Zhang, Danhui; Liu, Luman

    2016-01-01

    This study aims to investigate the impacts of information and communication technology (ICT) use on students' math and science achievements, with a special focus on examining the trends of these relationships over the past decade. Data from all five waves of the Program for International Student Assessment (PISA) from 2000 to 2012 were used.…

  4. Kinetics of carbendazim degradation in a horizontal tubular biofilm reactor.

    Science.gov (United States)

    Alvarado-Gutiérrez, María Luisa; Ruiz-Ordaz, Nora; Galíndez-Mayer, Juvencio; Santoyo-Tepole, Fortunata; Curiel-Quesada, Everardo; García-Mena, Jaime; Ahuatzi-Chacón, Deifilia

    2017-04-01

    The fungicide carbendazim is an ecotoxic agent affecting aquatic biota. Due to its suspected hormone-disrupting effects, it is considered a "priority hazard substance" by the Water Framework Directive of the European Commission, and its degradation is of major concern. In this work, a horizontal tubular biofilm reactor (HTBR) operating in plug-flow regime was used to study the kinetics of carbendazim removal by an acclimated microbial consortium. The reactor was operated in steady state continuous culture at eight different carbendazim loading rates. The concentrations of the fungicide were determined at several distances of the HTBR. At the loading rates tested, the highest instantaneous removal rates were observed in the first section of the tubular biofilm reactor. No evidence of inhibition of the catabolic activity of the microbial community was found. Strains of the genera Flectobacillus, Klebsiella, Stenotrophomonas, and Flavobacterium were identified in the biofilm; the last three degrade carbendazim in axenic culture.

  5. 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

  6. A filtration model applied to submerged anaerobic MBRs (SAnMBRs)

    OpenAIRE

    Robles Martínez, Ángel; Ruano García, María Victoria; Ribes Bertomeu, José; SECO TORRECILLAS, AURORA; Ferrer, J.

    2013-01-01

    The aim of this study was to develop a model able to correctly reproduce the filtration process of submerged anaerobic MBRs (SAnMBRs). The proposed model was calibrated and validated in a SAnMBR demonstration plant fitted with industrial-scale hollow-fibre membranes. Three suspended components were contemplated in the model: total solids concentration; dry mass of cake on the membrane surface; and dry mass of irreversible fouling on the membrane surface. The model addressed the following phys...

  7. Digital, remote control system for a 2-MW research reactor

    Energy Technology Data Exchange (ETDEWEB)

    Battle, R.E.; Corbett, G.K.

    1988-01-01

    A fault-tolerant programmable logic controller (PLC) and operator workstations have been programmed to replace the hard-wired relay control system in the 2-MW Bulk Shielding Reactor (BSR) at Oak Ridge National Laboratory. In addition to the PLC and remote and local operator workstations, auxiliary systems for remote operation include a video system, an intercom system, and a fiber optic communication system. The remote control station, located at the High Flux Isotope Reactor 2.5 km from the BSR, has the capability of rector startup and power control. The system was designed with reliability and fail-safe features as important considerations. 4 refs., 3 figs.

  8. DESCRIPCION DE TRES PROCESOS NEUROPSICOLOGICOS (LATERALIDAD, DISCRIMINACION AUDITIVA Y MEMORIA DE TRABAJO) EN NIÑOS Y NIÑAS QUE PRESENTAN REPETICION DEL PRIMER GRADO ESCOLAR Y NO HAN ALCANZADO EL NIVEL BÁSICO DE LECTOESCRITURA.

    OpenAIRE

    Bustamante-Vásquez, Yadith Maria

    2016-01-01

    Introducción: El presente estudio tuvo como objetivo describir tres procesos neuropsicológicos (lateralidad, discriminación audita y memoria (verbal y no verbal) en niños y niñas que han presentado repetición de sus primeros años escolares y no han alcanzado el nivel mínimo de lectoescritura, razón por la cual se encuentran en el grado especial flexible de procesos básicos. Método: Se trabajó con 40 sujetos (niños, niñas y adolescentes) del grado procesos básicos del colegio San Benito de ...

  9. A cubic autocatalytic reaction in a continuous stirred tank reactor

    Energy Technology Data Exchange (ETDEWEB)

    Yakubu, Aisha Aliyu; Yatim, Yazariah Mohd [School of Mathematical Sciences, Universiti Sains Malaysia, 11800 USM, Penang Malaysia (Malaysia)

    2015-10-22

    In the present study, the dynamics of the cubic autocatalytic reaction model in a continuous stirred tank reactor with linear autocatalyst decay is studied. This model describes the behavior of two chemicals (reactant and autocatalyst) flowing into the tank reactor. The behavior of the model is studied analytically and numerically. The steady state solutions are obtained for two cases, i.e. with the presence of an autocatalyst and its absence in the inflow. In the case with an autocatalyst, the model has a stable steady state. While in the case without an autocatalyst, the model exhibits three steady states, where one of the steady state is stable, the second is a saddle point while the last is spiral node. The last steady state losses stability through Hopf bifurcation and the location is determined. The physical interpretations of the results are also presented.

  10. Wastewater treatment in a hybrid activated sludge baffled reactor.

    Science.gov (United States)

    Tizghadam, Mostafa; Dagot, Christophe; Baudu, Michel

    2008-06-15

    A novel hybrid activated sludge baffled reactor (HASBR), which contained both suspended and attached-growth biomass perfect mixing cells in series, was developed by installing standing and hanging baffles and introducing plastic brushes into a conventional activated sludge (CAS) reactor. It was used for the treatment of domestic wastewater. The effects on the operational performance of developing the suspended and attached-growth biomass and reactor configuration were investigated. The change of the flow regime from complete-mix to plug-flow, and the addition of plastic brushes as a support for biofilm, resulted in considerable improvements in the COD, nitrogen removal efficiency of domestic wastewater and sludge settling properties. In steady state, approximately 98+/-2% of the total COD and 98+/-2% of the ammonia of the influent were removed in the HASBR, when the influent wastewater concentration was 593+/-11 mg COD/L and 43+/-5 mg N/L, respectively, at a HRT of 10 h. These results were 93+/-3 and 6+/-3% for the CAS reactor, respectively. Approximately 90+/-7% of the total COD was removed in the HASBR, when the influent wastewater concentration was 654+/-16 mg COD/L at a 3h HRT, and in the organic loading rate (OLR) of 5.36kgCOD m(-3) day(-1). The result for the CAS reactor was 60+/-3%. Existing CAS plants can be upgraded by changing the reactor configuration and introducing biofilm support media into the aeration tank.

  11. A scoping analysis of the neotronic design for a new South African research reactor / Vermaak J.I.C.

    OpenAIRE

    Vermaak, Jan Izak Cornelius

    2011-01-01

    Together with many other research reactors around the world, the SAFARI–1 reactor has been classified as an ageing research reactor. In order to continue the provision of the current irradiation services, the operator of the reactor, NECSA, needs to consider the replacement of SAFARI–1 with a new large neutron source, and therefore ultimately a new reactor. A replacement research reactor will have to provide irradiation services that primarily include: radio–isotope producti...

  12. 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.

  13. A Pebble-Bed Breed-and-Burn Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Greenspan, Ehud [Univ. of California, Berkeley, CA (United States)

    2016-03-31

    The primary objective of this project is to use three-dimensional fuel shuffling in order to reduce the minimum peak radiation damage of ~550 dpa present Breed-and-Burn (B&B) fast nuclear reactor cores designs (they feature 2-D fuel shuffling) call for to as close as possible to the presently accepted value of 200 dpa thereby enabling earlier commercialization of B&B reactors which could make substantial contribution to energy sustainability and economic stability without need for fuel recycling. Another objective is increasing the average discharge burnup for the same peak discharge burnup thereby (1) increasing the fuel utilization of 2-D shuffled B&B reactors and (2) reducing the reprocessing capacity required to support a given capacity of FRs that are to recycle fuel.

  14. Nuclear Reactors. Revised.

    Science.gov (United States)

    Hogerton, John F.

    This publication is one of a series of information booklets for the general public published by the United States Atomic Energy Commission. Among the topics discussed are: How Reactors Work; Reactor Design; Research, Teaching, and Materials Testing; Reactors (Research, Teaching and Materials); Production Reactors; Reactors for Electric Power…

  15. Nonlinear dynamics and control of a recycle fixed bed reactor

    DEFF Research Database (Denmark)

    Recke, Bodil; Jørgensen, Sten Bay

    1997-01-01

    The purpose of this paper is twofold. Primarily to describe the dynamic behaviour that can be observed in a fixed bed reactor with recycle of unconverted reactant. Secondly to describe the possibilities of model reduction in order to facilitate control design. Reactant recycle has been shown...... to introduce periodic solution to the fixed bed reactor, a phenomenon which is not seen for the system without the recycle, at least not within the Peclet number range investigated in the present work. The possibility of model reduction by the methods of modal decomposition, and by characteristics...

  16. A highly accurate benchmark for reactor point kinetics with feedback

    Energy Technology Data Exchange (ETDEWEB)

    Ganapol, B. D.; Picca, P., E-mail: Ganapol@cowboy.ame.arizon [University of Arizona, 1501 N Campbell Ave, Tucson, AZ 85724 (United States)

    2010-10-15

    This work apply the concept of convergence acceleration, also known as extrapolation, to find the solution to the reactor kinetics equations describing nuclear reactor transients. The method features simplicity in that an approximate finite difference formulation is constructed and converged to high accuracy from knowledge of how the error term behaves. Through Rom berg extrapolation, we demonstrate its high accuracy for a variety of imposed reactivity insertions found in the literature as well as nonlinear temperature and fission product feedback. A unique feature of the proposed method, called RKE/R(om berg) algorithm, is interval bisection to ensure high accuracy. (Author)

  17. 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

  18. 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.

  19. REACTOR COOLING

    Science.gov (United States)

    Quackenbush, C.F.

    1959-09-29

    A nuclear reactor with provisions for selectively cooling the fuel elements is described. The reactor has a plurality of tubes extending throughout. Cylindrical fuel elements are disposed within the tubes and the coolant flows through the tubes and around the fuel elements. The fuel elements within the central portion of the reactor are provided with roughened surfaces of material. The fuel elements in the end portions of the tubes within the reactor are provlded with low conduction jackets and the fuel elements in the region between the central portion and the end portions are provided with smooth surfaces of high heat conduction material.

  20. Anatomía vegetal en San Alberto Magno

    Directory of Open Access Journals (Sweden)

    Valderas, José María

    1988-01-01

    Full Text Available Since T. A. Sprague wrote his outstanding essays many years ago on the meaning of botanical terms used by Plinius, Isidorus, Albertus and Ruellius, no one else had resumed this task, which is essential for the history of botany. Though Albertus explained vegetal structure in terms of the function it fulfils, the methodology used here ignores Physiology and concentrates on Morphology. After discussing the composition of De Vegetabilibus, we deal with organs using the order and division established by Albertus: succus, nodus, radix. venae, stipes, ramus, cortex, flos, folium, fructus, and so on.

    Desde los ya lejanos, y meritísimos, trabajos de T. A. Sprague sobre el significado de los términos botánicos empleados por Plinio, Isidoro, Alberto y Ruellius, nadie había reemprendido tan necesaria tarea para la historia de la botánica. Aunque la razón de una estructura vegetal se explica, en San Alberto, por la función que cumple, aquí prescindimos metodológicamente de la fisiología para ceñirnos a la morfología. Tras exponer la composición del De Vegetabilibus, abordamos los distintos órganos de la planta según el orden y la división trazados por él: succus, nodus, radix, venae, stipes, ramus, cortex, flos, fructus, etcétera.